Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
f72ffdd6 | 3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar |
1da177e4 LT |
4 | |
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
ff01bb48 | 39 | #include <linux/fs.h> |
d7603b7e | 40 | #include <linux/poll.h> |
16f17b39 | 41 | #include <linux/ctype.h> |
e7d2860b | 42 | #include <linux/string.h> |
fb4d8c76 N |
43 | #include <linux/hdreg.h> |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/random.h> | |
056075c7 | 46 | #include <linux/module.h> |
fb4d8c76 | 47 | #include <linux/reboot.h> |
32a7627c | 48 | #include <linux/file.h> |
aa98aa31 | 49 | #include <linux/compat.h> |
25570727 | 50 | #include <linux/delay.h> |
bff61975 N |
51 | #include <linux/raid/md_p.h> |
52 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
43b2e5d8 | 54 | #include "md.h" |
ef740c37 | 55 | #include "bitmap.h" |
edb39c9d | 56 | #include "md-cluster.h" |
1da177e4 | 57 | |
1da177e4 | 58 | #ifndef MODULE |
d710e138 | 59 | static void autostart_arrays(int part); |
1da177e4 LT |
60 | #endif |
61 | ||
01f96c0a N |
62 | /* pers_list is a list of registered personalities protected |
63 | * by pers_lock. | |
64 | * pers_lock does extra service to protect accesses to | |
65 | * mddev->thread when the mutex cannot be held. | |
66 | */ | |
2604b703 | 67 | static LIST_HEAD(pers_list); |
1da177e4 LT |
68 | static DEFINE_SPINLOCK(pers_lock); |
69 | ||
edb39c9d | 70 | struct md_cluster_operations *md_cluster_ops; |
589a1c49 | 71 | EXPORT_SYMBOL(md_cluster_ops); |
edb39c9d GR |
72 | struct module *md_cluster_mod; |
73 | EXPORT_SYMBOL(md_cluster_mod); | |
74 | ||
90b08710 | 75 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
76 | static struct workqueue_struct *md_wq; |
77 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 78 | |
746d3207 N |
79 | static int remove_and_add_spares(struct mddev *mddev, |
80 | struct md_rdev *this); | |
5aa61f42 | 81 | static void mddev_detach(struct mddev *mddev); |
746d3207 | 82 | |
1e50915f RB |
83 | /* |
84 | * Default number of read corrections we'll attempt on an rdev | |
85 | * before ejecting it from the array. We divide the read error | |
86 | * count by 2 for every hour elapsed between read errors. | |
87 | */ | |
88 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
89 | /* |
90 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
91 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
92 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 93 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
94 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
95 | * speed limit - in case reconstruction slows down your system despite | |
96 | * idle IO detection. | |
97 | * | |
98 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 99 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
100 | */ |
101 | ||
102 | static int sysctl_speed_limit_min = 1000; | |
103 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 104 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
105 | { |
106 | return mddev->sync_speed_min ? | |
107 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
108 | } | |
109 | ||
fd01b88c | 110 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
111 | { |
112 | return mddev->sync_speed_max ? | |
113 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
114 | } | |
1da177e4 LT |
115 | |
116 | static struct ctl_table_header *raid_table_header; | |
117 | ||
82592c38 | 118 | static struct ctl_table raid_table[] = { |
1da177e4 | 119 | { |
1da177e4 LT |
120 | .procname = "speed_limit_min", |
121 | .data = &sysctl_speed_limit_min, | |
122 | .maxlen = sizeof(int), | |
80ca3a44 | 123 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 124 | .proc_handler = proc_dointvec, |
1da177e4 LT |
125 | }, |
126 | { | |
1da177e4 LT |
127 | .procname = "speed_limit_max", |
128 | .data = &sysctl_speed_limit_max, | |
129 | .maxlen = sizeof(int), | |
80ca3a44 | 130 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 131 | .proc_handler = proc_dointvec, |
1da177e4 | 132 | }, |
894d2491 | 133 | { } |
1da177e4 LT |
134 | }; |
135 | ||
82592c38 | 136 | static struct ctl_table raid_dir_table[] = { |
1da177e4 | 137 | { |
1da177e4 LT |
138 | .procname = "raid", |
139 | .maxlen = 0, | |
80ca3a44 | 140 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
141 | .child = raid_table, |
142 | }, | |
894d2491 | 143 | { } |
1da177e4 LT |
144 | }; |
145 | ||
82592c38 | 146 | static struct ctl_table raid_root_table[] = { |
1da177e4 | 147 | { |
1da177e4 LT |
148 | .procname = "dev", |
149 | .maxlen = 0, | |
150 | .mode = 0555, | |
151 | .child = raid_dir_table, | |
152 | }, | |
894d2491 | 153 | { } |
1da177e4 LT |
154 | }; |
155 | ||
83d5cde4 | 156 | static const struct block_device_operations md_fops; |
1da177e4 | 157 | |
f91de92e N |
158 | static int start_readonly; |
159 | ||
a167f663 N |
160 | /* bio_clone_mddev |
161 | * like bio_clone, but with a local bio set | |
162 | */ | |
163 | ||
a167f663 | 164 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 165 | struct mddev *mddev) |
a167f663 N |
166 | { |
167 | struct bio *b; | |
a167f663 N |
168 | |
169 | if (!mddev || !mddev->bio_set) | |
170 | return bio_alloc(gfp_mask, nr_iovecs); | |
171 | ||
395c72a7 | 172 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
173 | if (!b) |
174 | return NULL; | |
a167f663 N |
175 | return b; |
176 | } | |
177 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
178 | ||
179 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 180 | struct mddev *mddev) |
a167f663 | 181 | { |
a167f663 N |
182 | if (!mddev || !mddev->bio_set) |
183 | return bio_clone(bio, gfp_mask); | |
184 | ||
bf800ef1 | 185 | return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
a167f663 N |
186 | } |
187 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
188 | ||
d7603b7e N |
189 | /* |
190 | * We have a system wide 'event count' that is incremented | |
191 | * on any 'interesting' event, and readers of /proc/mdstat | |
192 | * can use 'poll' or 'select' to find out when the event | |
193 | * count increases. | |
194 | * | |
195 | * Events are: | |
196 | * start array, stop array, error, add device, remove device, | |
197 | * start build, activate spare | |
198 | */ | |
2989ddbd | 199 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 200 | static atomic_t md_event_count; |
fd01b88c | 201 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
202 | { |
203 | atomic_inc(&md_event_count); | |
204 | wake_up(&md_event_waiters); | |
205 | } | |
29269553 | 206 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 207 | |
c331eb04 N |
208 | /* Alternate version that can be called from interrupts |
209 | * when calling sysfs_notify isn't needed. | |
210 | */ | |
fd01b88c | 211 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
212 | { |
213 | atomic_inc(&md_event_count); | |
214 | wake_up(&md_event_waiters); | |
215 | } | |
216 | ||
1da177e4 LT |
217 | /* |
218 | * Enables to iterate over all existing md arrays | |
219 | * all_mddevs_lock protects this list. | |
220 | */ | |
221 | static LIST_HEAD(all_mddevs); | |
222 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
223 | ||
1da177e4 LT |
224 | /* |
225 | * iterates through all used mddevs in the system. | |
226 | * We take care to grab the all_mddevs_lock whenever navigating | |
227 | * the list, and to always hold a refcount when unlocked. | |
228 | * Any code which breaks out of this loop while own | |
229 | * a reference to the current mddev and must mddev_put it. | |
230 | */ | |
fd01b88c | 231 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 | 232 | \ |
f72ffdd6 | 233 | for (({ spin_lock(&all_mddevs_lock); \ |
fd01b88c N |
234 | _tmp = all_mddevs.next; \ |
235 | _mddev = NULL;}); \ | |
236 | ({ if (_tmp != &all_mddevs) \ | |
237 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 238 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
239 | if (_mddev) mddev_put(_mddev); \ |
240 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
241 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 242 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 243 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
244 | ) |
245 | ||
409c57f3 N |
246 | /* Rather than calling directly into the personality make_request function, |
247 | * IO requests come here first so that we can check if the device is | |
248 | * being suspended pending a reconfiguration. | |
249 | * We hold a refcount over the call to ->make_request. By the time that | |
250 | * call has finished, the bio has been linked into some internal structure | |
251 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
252 | */ | |
dece1635 | 253 | static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 254 | { |
49077326 | 255 | const int rw = bio_data_dir(bio); |
fd01b88c | 256 | struct mddev *mddev = q->queuedata; |
e91ece55 | 257 | unsigned int sectors; |
74672d06 | 258 | int cpu; |
49077326 | 259 | |
54efd50b KO |
260 | blk_queue_split(q, &bio, q->bio_split); |
261 | ||
0ca69886 N |
262 | if (mddev == NULL || mddev->pers == NULL |
263 | || !mddev->ready) { | |
409c57f3 | 264 | bio_io_error(bio); |
dece1635 | 265 | return BLK_QC_T_NONE; |
409c57f3 | 266 | } |
bbfa57c0 | 267 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
4246a0b6 CH |
268 | if (bio_sectors(bio) != 0) |
269 | bio->bi_error = -EROFS; | |
270 | bio_endio(bio); | |
dece1635 | 271 | return BLK_QC_T_NONE; |
bbfa57c0 | 272 | } |
0ca69886 | 273 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 274 | rcu_read_lock(); |
e9c7469b | 275 | if (mddev->suspended) { |
409c57f3 N |
276 | DEFINE_WAIT(__wait); |
277 | for (;;) { | |
278 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
279 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 280 | if (!mddev->suspended) |
409c57f3 N |
281 | break; |
282 | rcu_read_unlock(); | |
283 | schedule(); | |
284 | rcu_read_lock(); | |
285 | } | |
286 | finish_wait(&mddev->sb_wait, &__wait); | |
287 | } | |
288 | atomic_inc(&mddev->active_io); | |
289 | rcu_read_unlock(); | |
49077326 | 290 | |
e91ece55 CM |
291 | /* |
292 | * save the sectors now since our bio can | |
293 | * go away inside make_request | |
294 | */ | |
295 | sectors = bio_sectors(bio); | |
5a7bbad2 | 296 | mddev->pers->make_request(mddev, bio); |
49077326 | 297 | |
74672d06 GZ |
298 | cpu = part_stat_lock(); |
299 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
300 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); | |
301 | part_stat_unlock(); | |
49077326 | 302 | |
409c57f3 N |
303 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
304 | wake_up(&mddev->sb_wait); | |
dece1635 JA |
305 | |
306 | return BLK_QC_T_NONE; | |
409c57f3 N |
307 | } |
308 | ||
9e35b99c N |
309 | /* mddev_suspend makes sure no new requests are submitted |
310 | * to the device, and that any requests that have been submitted | |
311 | * are completely handled. | |
afa0f557 N |
312 | * Once mddev_detach() is called and completes, the module will be |
313 | * completely unused. | |
9e35b99c | 314 | */ |
fd01b88c | 315 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
316 | { |
317 | BUG_ON(mddev->suspended); | |
318 | mddev->suspended = 1; | |
319 | synchronize_rcu(); | |
320 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
321 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
322 | |
323 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 324 | } |
390ee602 | 325 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 326 | |
fd01b88c | 327 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
328 | { |
329 | mddev->suspended = 0; | |
330 | wake_up(&mddev->sb_wait); | |
331 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 332 | |
47525e59 | 333 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
334 | md_wakeup_thread(mddev->thread); |
335 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 336 | } |
390ee602 | 337 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 338 | |
fd01b88c | 339 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 | 340 | { |
5c675f83 N |
341 | struct md_personality *pers = mddev->pers; |
342 | int ret = 0; | |
343 | ||
344 | rcu_read_lock(); | |
345 | if (mddev->suspended) | |
346 | ret = 1; | |
347 | else if (pers && pers->congested) | |
348 | ret = pers->congested(mddev, bits); | |
349 | rcu_read_unlock(); | |
350 | return ret; | |
351 | } | |
352 | EXPORT_SYMBOL_GPL(mddev_congested); | |
353 | static int md_congested(void *data, int bits) | |
354 | { | |
355 | struct mddev *mddev = data; | |
356 | return mddev_congested(mddev, bits); | |
3fa841d7 | 357 | } |
3fa841d7 | 358 | |
a2826aa9 | 359 | /* |
e9c7469b | 360 | * Generic flush handling for md |
a2826aa9 N |
361 | */ |
362 | ||
4246a0b6 | 363 | static void md_end_flush(struct bio *bio) |
a2826aa9 | 364 | { |
3cb03002 | 365 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 366 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
367 | |
368 | rdev_dec_pending(rdev, mddev); | |
369 | ||
370 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 371 | /* The pre-request flush has finished */ |
e804ac78 | 372 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
373 | } |
374 | bio_put(bio); | |
375 | } | |
376 | ||
a7a07e69 N |
377 | static void md_submit_flush_data(struct work_struct *ws); |
378 | ||
a035fc3e | 379 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 380 | { |
fd01b88c | 381 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 382 | struct md_rdev *rdev; |
a2826aa9 | 383 | |
a7a07e69 N |
384 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
385 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 386 | rcu_read_lock(); |
dafb20fa | 387 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
388 | if (rdev->raid_disk >= 0 && |
389 | !test_bit(Faulty, &rdev->flags)) { | |
390 | /* Take two references, one is dropped | |
391 | * when request finishes, one after | |
392 | * we reclaim rcu_read_lock | |
393 | */ | |
394 | struct bio *bi; | |
395 | atomic_inc(&rdev->nr_pending); | |
396 | atomic_inc(&rdev->nr_pending); | |
397 | rcu_read_unlock(); | |
b5e1b8ce | 398 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 399 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
400 | bi->bi_private = rdev; |
401 | bi->bi_bdev = rdev->bdev; | |
402 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 403 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
404 | rcu_read_lock(); |
405 | rdev_dec_pending(rdev, mddev); | |
406 | } | |
407 | rcu_read_unlock(); | |
a7a07e69 N |
408 | if (atomic_dec_and_test(&mddev->flush_pending)) |
409 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
410 | } |
411 | ||
e9c7469b | 412 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 413 | { |
fd01b88c | 414 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 415 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 416 | |
4f024f37 | 417 | if (bio->bi_iter.bi_size == 0) |
a2826aa9 | 418 | /* an empty barrier - all done */ |
4246a0b6 | 419 | bio_endio(bio); |
a2826aa9 | 420 | else { |
e9c7469b | 421 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 422 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 423 | } |
2b74e12e N |
424 | |
425 | mddev->flush_bio = NULL; | |
426 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
427 | } |
428 | ||
fd01b88c | 429 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 | 430 | { |
85572d7c | 431 | spin_lock_irq(&mddev->lock); |
a2826aa9 | 432 | wait_event_lock_irq(mddev->sb_wait, |
e9c7469b | 433 | !mddev->flush_bio, |
85572d7c | 434 | mddev->lock); |
e9c7469b | 435 | mddev->flush_bio = bio; |
85572d7c | 436 | spin_unlock_irq(&mddev->lock); |
a2826aa9 | 437 | |
a035fc3e N |
438 | INIT_WORK(&mddev->flush_work, submit_flushes); |
439 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 440 | } |
e9c7469b | 441 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 442 | |
74018dc3 | 443 | void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
97658cdd | 444 | { |
9cbb1750 N |
445 | struct mddev *mddev = cb->data; |
446 | md_wakeup_thread(mddev->thread); | |
447 | kfree(cb); | |
97658cdd | 448 | } |
9cbb1750 | 449 | EXPORT_SYMBOL(md_unplug); |
2ac87401 | 450 | |
fd01b88c | 451 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
452 | { |
453 | atomic_inc(&mddev->active); | |
454 | return mddev; | |
455 | } | |
456 | ||
5fd3a17e | 457 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 458 | |
fd01b88c | 459 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 460 | { |
a167f663 N |
461 | struct bio_set *bs = NULL; |
462 | ||
1da177e4 LT |
463 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
464 | return; | |
d3374825 | 465 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
466 | mddev->ctime == 0 && !mddev->hold_active) { |
467 | /* Array is not configured at all, and not held active, | |
468 | * so destroy it */ | |
af8a2434 | 469 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
470 | bs = mddev->bio_set; |
471 | mddev->bio_set = NULL; | |
d3374825 | 472 | if (mddev->gendisk) { |
e804ac78 TH |
473 | /* We did a probe so need to clean up. Call |
474 | * queue_work inside the spinlock so that | |
475 | * flush_workqueue() after mddev_find will | |
476 | * succeed in waiting for the work to be done. | |
d3374825 N |
477 | */ |
478 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 479 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
480 | } else |
481 | kfree(mddev); | |
482 | } | |
483 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
484 | if (bs) |
485 | bioset_free(bs); | |
1da177e4 LT |
486 | } |
487 | ||
25b2edfa SL |
488 | static void md_safemode_timeout(unsigned long data); |
489 | ||
fd01b88c | 490 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
491 | { |
492 | mutex_init(&mddev->open_mutex); | |
493 | mutex_init(&mddev->reconfig_mutex); | |
494 | mutex_init(&mddev->bitmap_info.mutex); | |
495 | INIT_LIST_HEAD(&mddev->disks); | |
496 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
25b2edfa SL |
497 | setup_timer(&mddev->safemode_timer, md_safemode_timeout, |
498 | (unsigned long) mddev); | |
fafd7fb0 N |
499 | atomic_set(&mddev->active, 1); |
500 | atomic_set(&mddev->openers, 0); | |
501 | atomic_set(&mddev->active_io, 0); | |
85572d7c | 502 | spin_lock_init(&mddev->lock); |
fafd7fb0 N |
503 | atomic_set(&mddev->flush_pending, 0); |
504 | init_waitqueue_head(&mddev->sb_wait); | |
505 | init_waitqueue_head(&mddev->recovery_wait); | |
506 | mddev->reshape_position = MaxSector; | |
2c810cdd | 507 | mddev->reshape_backwards = 0; |
c4a39551 | 508 | mddev->last_sync_action = "none"; |
fafd7fb0 N |
509 | mddev->resync_min = 0; |
510 | mddev->resync_max = MaxSector; | |
511 | mddev->level = LEVEL_NONE; | |
512 | } | |
390ee602 | 513 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 514 | |
f72ffdd6 | 515 | static struct mddev *mddev_find(dev_t unit) |
1da177e4 | 516 | { |
fd01b88c | 517 | struct mddev *mddev, *new = NULL; |
1da177e4 | 518 | |
8f5f02c4 N |
519 | if (unit && MAJOR(unit) != MD_MAJOR) |
520 | unit &= ~((1<<MdpMinorShift)-1); | |
521 | ||
1da177e4 LT |
522 | retry: |
523 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
524 | |
525 | if (unit) { | |
526 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
527 | if (mddev->unit == unit) { | |
528 | mddev_get(mddev); | |
529 | spin_unlock(&all_mddevs_lock); | |
530 | kfree(new); | |
531 | return mddev; | |
532 | } | |
533 | ||
534 | if (new) { | |
535 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 536 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
537 | new->hold_active = UNTIL_IOCTL; |
538 | return new; | |
1da177e4 | 539 | } |
efeb53c0 N |
540 | } else if (new) { |
541 | /* find an unused unit number */ | |
542 | static int next_minor = 512; | |
543 | int start = next_minor; | |
544 | int is_free = 0; | |
545 | int dev = 0; | |
546 | while (!is_free) { | |
547 | dev = MKDEV(MD_MAJOR, next_minor); | |
548 | next_minor++; | |
549 | if (next_minor > MINORMASK) | |
550 | next_minor = 0; | |
551 | if (next_minor == start) { | |
552 | /* Oh dear, all in use. */ | |
553 | spin_unlock(&all_mddevs_lock); | |
554 | kfree(new); | |
555 | return NULL; | |
556 | } | |
f72ffdd6 | 557 | |
efeb53c0 N |
558 | is_free = 1; |
559 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
560 | if (mddev->unit == dev) { | |
561 | is_free = 0; | |
562 | break; | |
563 | } | |
564 | } | |
565 | new->unit = dev; | |
566 | new->md_minor = MINOR(dev); | |
567 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
568 | list_add(&new->all_mddevs, &all_mddevs); |
569 | spin_unlock(&all_mddevs_lock); | |
570 | return new; | |
571 | } | |
572 | spin_unlock(&all_mddevs_lock); | |
573 | ||
9ffae0cf | 574 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
575 | if (!new) |
576 | return NULL; | |
577 | ||
1da177e4 LT |
578 | new->unit = unit; |
579 | if (MAJOR(unit) == MD_MAJOR) | |
580 | new->md_minor = MINOR(unit); | |
581 | else | |
582 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
583 | ||
fafd7fb0 | 584 | mddev_init(new); |
1da177e4 | 585 | |
1da177e4 LT |
586 | goto retry; |
587 | } | |
588 | ||
b6eb127d N |
589 | static struct attribute_group md_redundancy_group; |
590 | ||
5c47daf6 | 591 | void mddev_unlock(struct mddev *mddev) |
1da177e4 | 592 | { |
a64c876f | 593 | if (mddev->to_remove) { |
b6eb127d N |
594 | /* These cannot be removed under reconfig_mutex as |
595 | * an access to the files will try to take reconfig_mutex | |
596 | * while holding the file unremovable, which leads to | |
597 | * a deadlock. | |
bb4f1e9d N |
598 | * So hold set sysfs_active while the remove in happeing, |
599 | * and anything else which might set ->to_remove or my | |
600 | * otherwise change the sysfs namespace will fail with | |
601 | * -EBUSY if sysfs_active is still set. | |
602 | * We set sysfs_active under reconfig_mutex and elsewhere | |
603 | * test it under the same mutex to ensure its correct value | |
604 | * is seen. | |
b6eb127d | 605 | */ |
a64c876f N |
606 | struct attribute_group *to_remove = mddev->to_remove; |
607 | mddev->to_remove = NULL; | |
bb4f1e9d | 608 | mddev->sysfs_active = 1; |
b6eb127d N |
609 | mutex_unlock(&mddev->reconfig_mutex); |
610 | ||
00bcb4ac N |
611 | if (mddev->kobj.sd) { |
612 | if (to_remove != &md_redundancy_group) | |
613 | sysfs_remove_group(&mddev->kobj, to_remove); | |
614 | if (mddev->pers == NULL || | |
615 | mddev->pers->sync_request == NULL) { | |
616 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
617 | if (mddev->sysfs_action) | |
618 | sysfs_put(mddev->sysfs_action); | |
619 | mddev->sysfs_action = NULL; | |
620 | } | |
a64c876f | 621 | } |
bb4f1e9d | 622 | mddev->sysfs_active = 0; |
b6eb127d N |
623 | } else |
624 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 625 | |
751e67ca CD |
626 | /* As we've dropped the mutex we need a spinlock to |
627 | * make sure the thread doesn't disappear | |
01f96c0a N |
628 | */ |
629 | spin_lock(&pers_lock); | |
005eca5e | 630 | md_wakeup_thread(mddev->thread); |
01f96c0a | 631 | spin_unlock(&pers_lock); |
1da177e4 | 632 | } |
5c47daf6 | 633 | EXPORT_SYMBOL_GPL(mddev_unlock); |
1da177e4 | 634 | |
57d051dc | 635 | struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr) |
1ca69c4b N |
636 | { |
637 | struct md_rdev *rdev; | |
638 | ||
639 | rdev_for_each_rcu(rdev, mddev) | |
640 | if (rdev->desc_nr == nr) | |
641 | return rdev; | |
642 | ||
643 | return NULL; | |
644 | } | |
57d051dc | 645 | EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu); |
1ca69c4b N |
646 | |
647 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 648 | { |
3cb03002 | 649 | struct md_rdev *rdev; |
1da177e4 | 650 | |
dafb20fa | 651 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
652 | if (rdev->bdev->bd_dev == dev) |
653 | return rdev; | |
159ec1fc | 654 | |
1da177e4 LT |
655 | return NULL; |
656 | } | |
657 | ||
1ca69c4b N |
658 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
659 | { | |
660 | struct md_rdev *rdev; | |
661 | ||
662 | rdev_for_each_rcu(rdev, mddev) | |
663 | if (rdev->bdev->bd_dev == dev) | |
664 | return rdev; | |
665 | ||
666 | return NULL; | |
667 | } | |
668 | ||
84fc4b56 | 669 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 670 | { |
84fc4b56 | 671 | struct md_personality *pers; |
d9d166c2 N |
672 | list_for_each_entry(pers, &pers_list, list) { |
673 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 674 | return pers; |
d9d166c2 N |
675 | if (strcmp(pers->name, clevel)==0) |
676 | return pers; | |
677 | } | |
2604b703 N |
678 | return NULL; |
679 | } | |
680 | ||
b73df2d3 | 681 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 682 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 683 | { |
57b2caa3 | 684 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 685 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
686 | } |
687 | ||
f72ffdd6 | 688 | static int alloc_disk_sb(struct md_rdev *rdev) |
1da177e4 | 689 | { |
1da177e4 LT |
690 | rdev->sb_page = alloc_page(GFP_KERNEL); |
691 | if (!rdev->sb_page) { | |
692 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 693 | return -ENOMEM; |
1da177e4 LT |
694 | } |
695 | ||
696 | return 0; | |
697 | } | |
698 | ||
545c8795 | 699 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
700 | { |
701 | if (rdev->sb_page) { | |
2d1f3b5d | 702 | put_page(rdev->sb_page); |
1da177e4 LT |
703 | rdev->sb_loaded = 0; |
704 | rdev->sb_page = NULL; | |
0f420358 | 705 | rdev->sb_start = 0; |
dd8ac336 | 706 | rdev->sectors = 0; |
1da177e4 | 707 | } |
2699b672 N |
708 | if (rdev->bb_page) { |
709 | put_page(rdev->bb_page); | |
710 | rdev->bb_page = NULL; | |
711 | } | |
4fa2f327 N |
712 | kfree(rdev->badblocks.page); |
713 | rdev->badblocks.page = NULL; | |
1da177e4 | 714 | } |
545c8795 | 715 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 716 | |
4246a0b6 | 717 | static void super_written(struct bio *bio) |
7bfa19f2 | 718 | { |
3cb03002 | 719 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 720 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 721 | |
4246a0b6 CH |
722 | if (bio->bi_error) { |
723 | printk("md: super_written gets error=%d\n", bio->bi_error); | |
a9701a30 | 724 | md_error(mddev, rdev); |
3a0f5bbb | 725 | } |
7bfa19f2 | 726 | |
a9701a30 N |
727 | if (atomic_dec_and_test(&mddev->pending_writes)) |
728 | wake_up(&mddev->sb_wait); | |
f8b58edf | 729 | bio_put(bio); |
7bfa19f2 N |
730 | } |
731 | ||
fd01b88c | 732 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
733 | sector_t sector, int size, struct page *page) |
734 | { | |
735 | /* write first size bytes of page to sector of rdev | |
736 | * Increment mddev->pending_writes before returning | |
737 | * and decrement it on completion, waking up sb_wait | |
738 | * if zero is reached. | |
739 | * If an error occurred, call md_error | |
740 | */ | |
a167f663 | 741 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 742 | |
a6ff7e08 | 743 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
4f024f37 | 744 | bio->bi_iter.bi_sector = sector; |
7bfa19f2 N |
745 | bio_add_page(bio, page, size, 0); |
746 | bio->bi_private = rdev; | |
747 | bio->bi_end_io = super_written; | |
a9701a30 | 748 | |
7bfa19f2 | 749 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 750 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
751 | } |
752 | ||
fd01b88c | 753 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 754 | { |
e9c7469b | 755 | /* wait for all superblock writes that were scheduled to complete */ |
1967cd56 | 756 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
7bfa19f2 N |
757 | } |
758 | ||
3cb03002 | 759 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 760 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 761 | { |
a167f663 | 762 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
763 | int ret; |
764 | ||
a6ff7e08 JB |
765 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
766 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 | 767 | if (metadata_op) |
4f024f37 | 768 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
1fdd6fc9 N |
769 | else if (rdev->mddev->reshape_position != MaxSector && |
770 | (rdev->mddev->reshape_backwards == | |
771 | (sector >= rdev->mddev->reshape_position))) | |
4f024f37 | 772 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
ccebd4c4 | 773 | else |
4f024f37 | 774 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
1da177e4 | 775 | bio_add_page(bio, page, size, 0); |
c170bbb4 | 776 | submit_bio_wait(rw, bio); |
1da177e4 | 777 | |
4246a0b6 | 778 | ret = !bio->bi_error; |
1da177e4 LT |
779 | bio_put(bio); |
780 | return ret; | |
781 | } | |
a8745db2 | 782 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 783 | |
f72ffdd6 | 784 | static int read_disk_sb(struct md_rdev *rdev, int size) |
1da177e4 LT |
785 | { |
786 | char b[BDEVNAME_SIZE]; | |
403df478 | 787 | |
1da177e4 LT |
788 | if (rdev->sb_loaded) |
789 | return 0; | |
790 | ||
ccebd4c4 | 791 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
792 | goto fail; |
793 | rdev->sb_loaded = 1; | |
794 | return 0; | |
795 | ||
796 | fail: | |
797 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
798 | bdevname(rdev->bdev,b)); | |
799 | return -EINVAL; | |
800 | } | |
801 | ||
802 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
803 | { | |
f72ffdd6 | 804 | return sb1->set_uuid0 == sb2->set_uuid0 && |
05710466 AN |
805 | sb1->set_uuid1 == sb2->set_uuid1 && |
806 | sb1->set_uuid2 == sb2->set_uuid2 && | |
807 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
808 | } |
809 | ||
1da177e4 LT |
810 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
811 | { | |
812 | int ret; | |
813 | mdp_super_t *tmp1, *tmp2; | |
814 | ||
815 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
816 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
817 | ||
818 | if (!tmp1 || !tmp2) { | |
819 | ret = 0; | |
35020f1a | 820 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
821 | goto abort; |
822 | } | |
823 | ||
824 | *tmp1 = *sb1; | |
825 | *tmp2 = *sb2; | |
826 | ||
827 | /* | |
828 | * nr_disks is not constant | |
829 | */ | |
830 | tmp1->nr_disks = 0; | |
831 | tmp2->nr_disks = 0; | |
832 | ||
ce0c8e05 | 833 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 834 | abort: |
990a8baf JJ |
835 | kfree(tmp1); |
836 | kfree(tmp2); | |
1da177e4 LT |
837 | return ret; |
838 | } | |
839 | ||
4d167f09 N |
840 | static u32 md_csum_fold(u32 csum) |
841 | { | |
842 | csum = (csum & 0xffff) + (csum >> 16); | |
843 | return (csum & 0xffff) + (csum >> 16); | |
844 | } | |
845 | ||
f72ffdd6 | 846 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
1da177e4 | 847 | { |
4d167f09 N |
848 | u64 newcsum = 0; |
849 | u32 *sb32 = (u32*)sb; | |
850 | int i; | |
1da177e4 LT |
851 | unsigned int disk_csum, csum; |
852 | ||
853 | disk_csum = sb->sb_csum; | |
854 | sb->sb_csum = 0; | |
4d167f09 N |
855 | |
856 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
857 | newcsum += sb32[i]; | |
858 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
859 | ||
4d167f09 N |
860 | #ifdef CONFIG_ALPHA |
861 | /* This used to use csum_partial, which was wrong for several | |
862 | * reasons including that different results are returned on | |
863 | * different architectures. It isn't critical that we get exactly | |
864 | * the same return value as before (we always csum_fold before | |
865 | * testing, and that removes any differences). However as we | |
866 | * know that csum_partial always returned a 16bit value on | |
867 | * alphas, do a fold to maximise conformity to previous behaviour. | |
868 | */ | |
869 | sb->sb_csum = md_csum_fold(disk_csum); | |
870 | #else | |
1da177e4 | 871 | sb->sb_csum = disk_csum; |
4d167f09 | 872 | #endif |
1da177e4 LT |
873 | return csum; |
874 | } | |
875 | ||
1da177e4 LT |
876 | /* |
877 | * Handle superblock details. | |
878 | * We want to be able to handle multiple superblock formats | |
879 | * so we have a common interface to them all, and an array of | |
880 | * different handlers. | |
881 | * We rely on user-space to write the initial superblock, and support | |
882 | * reading and updating of superblocks. | |
883 | * Interface methods are: | |
3cb03002 | 884 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
885 | * loads and validates a superblock on dev. |
886 | * if refdev != NULL, compare superblocks on both devices | |
887 | * Return: | |
888 | * 0 - dev has a superblock that is compatible with refdev | |
889 | * 1 - dev has a superblock that is compatible and newer than refdev | |
890 | * so dev should be used as the refdev in future | |
891 | * -EINVAL superblock incompatible or invalid | |
892 | * -othererror e.g. -EIO | |
893 | * | |
fd01b88c | 894 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
895 | * Verify that dev is acceptable into mddev. |
896 | * The first time, mddev->raid_disks will be 0, and data from | |
897 | * dev should be merged in. Subsequent calls check that dev | |
898 | * is new enough. Return 0 or -EINVAL | |
899 | * | |
fd01b88c | 900 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
901 | * Update the superblock for rdev with data in mddev |
902 | * This does not write to disc. | |
903 | * | |
904 | */ | |
905 | ||
906 | struct super_type { | |
0cd17fec CW |
907 | char *name; |
908 | struct module *owner; | |
c6563a8c N |
909 | int (*load_super)(struct md_rdev *rdev, |
910 | struct md_rdev *refdev, | |
0cd17fec | 911 | int minor_version); |
c6563a8c N |
912 | int (*validate_super)(struct mddev *mddev, |
913 | struct md_rdev *rdev); | |
914 | void (*sync_super)(struct mddev *mddev, | |
915 | struct md_rdev *rdev); | |
3cb03002 | 916 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 917 | sector_t num_sectors); |
c6563a8c N |
918 | int (*allow_new_offset)(struct md_rdev *rdev, |
919 | unsigned long long new_offset); | |
1da177e4 LT |
920 | }; |
921 | ||
0894cc30 AN |
922 | /* |
923 | * Check that the given mddev has no bitmap. | |
924 | * | |
925 | * This function is called from the run method of all personalities that do not | |
926 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
927 | * has a bitmap. Otherwise, it returns 0. | |
928 | * | |
929 | */ | |
fd01b88c | 930 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 931 | { |
c3d9714e | 932 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
933 | return 0; |
934 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
935 | mdname(mddev), mddev->pers->name); | |
936 | return 1; | |
937 | } | |
938 | EXPORT_SYMBOL(md_check_no_bitmap); | |
939 | ||
1da177e4 | 940 | /* |
f72ffdd6 | 941 | * load_super for 0.90.0 |
1da177e4 | 942 | */ |
3cb03002 | 943 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
944 | { |
945 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
946 | mdp_super_t *sb; | |
947 | int ret; | |
1da177e4 LT |
948 | |
949 | /* | |
0f420358 | 950 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
951 | * it's at the end of the disk. |
952 | * | |
953 | * It also happens to be a multiple of 4Kb. | |
954 | */ | |
57b2caa3 | 955 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 956 | |
0002b271 | 957 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
958 | if (ret) return ret; |
959 | ||
960 | ret = -EINVAL; | |
961 | ||
962 | bdevname(rdev->bdev, b); | |
65a06f06 | 963 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
964 | |
965 | if (sb->md_magic != MD_SB_MAGIC) { | |
966 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
967 | b); | |
968 | goto abort; | |
969 | } | |
970 | ||
971 | if (sb->major_version != 0 || | |
f6705578 N |
972 | sb->minor_version < 90 || |
973 | sb->minor_version > 91) { | |
1da177e4 LT |
974 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
975 | sb->major_version, sb->minor_version, | |
976 | b); | |
977 | goto abort; | |
978 | } | |
979 | ||
980 | if (sb->raid_disks <= 0) | |
981 | goto abort; | |
982 | ||
4d167f09 | 983 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
984 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
985 | b); | |
986 | goto abort; | |
987 | } | |
988 | ||
989 | rdev->preferred_minor = sb->md_minor; | |
990 | rdev->data_offset = 0; | |
c6563a8c | 991 | rdev->new_data_offset = 0; |
0002b271 | 992 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 993 | rdev->badblocks.shift = -1; |
1da177e4 LT |
994 | |
995 | if (sb->level == LEVEL_MULTIPATH) | |
996 | rdev->desc_nr = -1; | |
997 | else | |
998 | rdev->desc_nr = sb->this_disk.number; | |
999 | ||
9a7b2b0f | 1000 | if (!refdev) { |
1da177e4 | 1001 | ret = 1; |
9a7b2b0f | 1002 | } else { |
1da177e4 | 1003 | __u64 ev1, ev2; |
65a06f06 | 1004 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1005 | if (!uuid_equal(refsb, sb)) { |
1006 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1007 | b, bdevname(refdev->bdev,b2)); | |
1008 | goto abort; | |
1009 | } | |
1010 | if (!sb_equal(refsb, sb)) { | |
1011 | printk(KERN_WARNING "md: %s has same UUID" | |
1012 | " but different superblock to %s\n", | |
1013 | b, bdevname(refdev->bdev, b2)); | |
1014 | goto abort; | |
1015 | } | |
1016 | ev1 = md_event(sb); | |
1017 | ev2 = md_event(refsb); | |
1018 | if (ev1 > ev2) | |
1019 | ret = 1; | |
f72ffdd6 | 1020 | else |
1da177e4 LT |
1021 | ret = 0; |
1022 | } | |
8190e754 | 1023 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1024 | /* Limit to 4TB as metadata cannot record more than that. |
1025 | * (not needed for Linear and RAID0 as metadata doesn't | |
1026 | * record this size) | |
1027 | */ | |
1028 | if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) | |
27a7b260 | 1029 | rdev->sectors = (2ULL << 32) - 2; |
1da177e4 | 1030 | |
27a7b260 | 1031 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1032 | /* "this cannot possibly happen" ... */ |
1033 | ret = -EINVAL; | |
1034 | ||
1da177e4 LT |
1035 | abort: |
1036 | return ret; | |
1037 | } | |
1038 | ||
1039 | /* | |
1040 | * validate_super for 0.90.0 | |
1041 | */ | |
fd01b88c | 1042 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1043 | { |
1044 | mdp_disk_t *desc; | |
65a06f06 | 1045 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1046 | __u64 ev1 = md_event(sb); |
1da177e4 | 1047 | |
41158c7e | 1048 | rdev->raid_disk = -1; |
c5d79adb N |
1049 | clear_bit(Faulty, &rdev->flags); |
1050 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1051 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1052 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1053 | |
1da177e4 LT |
1054 | if (mddev->raid_disks == 0) { |
1055 | mddev->major_version = 0; | |
1056 | mddev->minor_version = sb->minor_version; | |
1057 | mddev->patch_version = sb->patch_version; | |
e691063a | 1058 | mddev->external = 0; |
9d8f0363 | 1059 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1060 | mddev->ctime = sb->ctime; |
1061 | mddev->utime = sb->utime; | |
1062 | mddev->level = sb->level; | |
d9d166c2 | 1063 | mddev->clevel[0] = 0; |
1da177e4 LT |
1064 | mddev->layout = sb->layout; |
1065 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1066 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1067 | mddev->events = ev1; |
c3d9714e | 1068 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1069 | mddev->bitmap_info.space = 0; |
1070 | /* bitmap can use 60 K after the 4K superblocks */ | |
c3d9714e | 1071 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 1072 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
2c810cdd | 1073 | mddev->reshape_backwards = 0; |
1da177e4 | 1074 | |
f6705578 N |
1075 | if (mddev->minor_version >= 91) { |
1076 | mddev->reshape_position = sb->reshape_position; | |
1077 | mddev->delta_disks = sb->delta_disks; | |
1078 | mddev->new_level = sb->new_level; | |
1079 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1080 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1081 | if (mddev->delta_disks < 0) |
1082 | mddev->reshape_backwards = 1; | |
f6705578 N |
1083 | } else { |
1084 | mddev->reshape_position = MaxSector; | |
1085 | mddev->delta_disks = 0; | |
1086 | mddev->new_level = mddev->level; | |
1087 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1088 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1089 | } |
1090 | ||
1da177e4 LT |
1091 | if (sb->state & (1<<MD_SB_CLEAN)) |
1092 | mddev->recovery_cp = MaxSector; | |
1093 | else { | |
f72ffdd6 | 1094 | if (sb->events_hi == sb->cp_events_hi && |
1da177e4 LT |
1095 | sb->events_lo == sb->cp_events_lo) { |
1096 | mddev->recovery_cp = sb->recovery_cp; | |
1097 | } else | |
1098 | mddev->recovery_cp = 0; | |
1099 | } | |
1100 | ||
1101 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1102 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1103 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1104 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1105 | ||
1106 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1107 | |
1108 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
6409bb05 | 1109 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1110 | mddev->bitmap_info.offset = |
1111 | mddev->bitmap_info.default_offset; | |
6409bb05 | 1112 | mddev->bitmap_info.space = |
c9ad020f | 1113 | mddev->bitmap_info.default_space; |
6409bb05 | 1114 | } |
a654b9d8 | 1115 | |
41158c7e | 1116 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1117 | /* Insist on good event counter while assembling, except |
1118 | * for spares (which don't need an event count) */ | |
1da177e4 | 1119 | ++ev1; |
be6800a7 N |
1120 | if (sb->disks[rdev->desc_nr].state & ( |
1121 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
f72ffdd6 | 1122 | if (ev1 < mddev->events) |
be6800a7 | 1123 | return -EINVAL; |
41158c7e N |
1124 | } else if (mddev->bitmap) { |
1125 | /* if adding to array with a bitmap, then we can accept an | |
1126 | * older device ... but not too old. | |
1127 | */ | |
41158c7e N |
1128 | if (ev1 < mddev->bitmap->events_cleared) |
1129 | return 0; | |
8313b8e5 N |
1130 | if (ev1 < mddev->events) |
1131 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1132 | } else { |
1133 | if (ev1 < mddev->events) | |
1134 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1135 | return 0; | |
1136 | } | |
41158c7e | 1137 | |
1da177e4 | 1138 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1139 | desc = sb->disks + rdev->desc_nr; |
1140 | ||
1141 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1142 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1143 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1144 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1145 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1146 | rdev->raid_disk = desc->raid_disk; |
f466722c | 1147 | rdev->saved_raid_disk = desc->raid_disk; |
0261cd9f N |
1148 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1149 | /* active but not in sync implies recovery up to | |
1150 | * reshape position. We don't know exactly where | |
1151 | * that is, so set to zero for now */ | |
1152 | if (mddev->minor_version >= 91) { | |
1153 | rdev->recovery_offset = 0; | |
1154 | rdev->raid_disk = desc->raid_disk; | |
1155 | } | |
1da177e4 | 1156 | } |
8ddf9efe N |
1157 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1158 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1159 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1160 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1161 | return 0; |
1162 | } | |
1163 | ||
1164 | /* | |
1165 | * sync_super for 0.90.0 | |
1166 | */ | |
fd01b88c | 1167 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1168 | { |
1169 | mdp_super_t *sb; | |
3cb03002 | 1170 | struct md_rdev *rdev2; |
1da177e4 | 1171 | int next_spare = mddev->raid_disks; |
19133a42 | 1172 | |
1da177e4 LT |
1173 | /* make rdev->sb match mddev data.. |
1174 | * | |
1175 | * 1/ zero out disks | |
1176 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1177 | * 3/ any empty disks < next_spare become removed | |
1178 | * | |
1179 | * disks[0] gets initialised to REMOVED because | |
1180 | * we cannot be sure from other fields if it has | |
1181 | * been initialised or not. | |
1182 | */ | |
1183 | int i; | |
1184 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1185 | ||
61181565 N |
1186 | rdev->sb_size = MD_SB_BYTES; |
1187 | ||
65a06f06 | 1188 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1189 | |
1190 | memset(sb, 0, sizeof(*sb)); | |
1191 | ||
1192 | sb->md_magic = MD_SB_MAGIC; | |
1193 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1194 | sb->patch_version = mddev->patch_version; |
1195 | sb->gvalid_words = 0; /* ignored */ | |
1196 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1197 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1198 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1199 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1200 | ||
1201 | sb->ctime = mddev->ctime; | |
1202 | sb->level = mddev->level; | |
58c0fed4 | 1203 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1204 | sb->raid_disks = mddev->raid_disks; |
1205 | sb->md_minor = mddev->md_minor; | |
e691063a | 1206 | sb->not_persistent = 0; |
1da177e4 LT |
1207 | sb->utime = mddev->utime; |
1208 | sb->state = 0; | |
1209 | sb->events_hi = (mddev->events>>32); | |
1210 | sb->events_lo = (u32)mddev->events; | |
1211 | ||
f6705578 N |
1212 | if (mddev->reshape_position == MaxSector) |
1213 | sb->minor_version = 90; | |
1214 | else { | |
1215 | sb->minor_version = 91; | |
1216 | sb->reshape_position = mddev->reshape_position; | |
1217 | sb->new_level = mddev->new_level; | |
1218 | sb->delta_disks = mddev->delta_disks; | |
1219 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1220 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1221 | } |
1222 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1223 | if (mddev->in_sync) |
1224 | { | |
1225 | sb->recovery_cp = mddev->recovery_cp; | |
1226 | sb->cp_events_hi = (mddev->events>>32); | |
1227 | sb->cp_events_lo = (u32)mddev->events; | |
1228 | if (mddev->recovery_cp == MaxSector) | |
1229 | sb->state = (1<< MD_SB_CLEAN); | |
1230 | } else | |
1231 | sb->recovery_cp = 0; | |
1232 | ||
1233 | sb->layout = mddev->layout; | |
9d8f0363 | 1234 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1235 | |
c3d9714e | 1236 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1237 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1238 | ||
1da177e4 | 1239 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1240 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1241 | mdp_disk_t *d; |
86e6ffdd | 1242 | int desc_nr; |
0261cd9f N |
1243 | int is_active = test_bit(In_sync, &rdev2->flags); |
1244 | ||
1245 | if (rdev2->raid_disk >= 0 && | |
1246 | sb->minor_version >= 91) | |
1247 | /* we have nowhere to store the recovery_offset, | |
1248 | * but if it is not below the reshape_position, | |
1249 | * we can piggy-back on that. | |
1250 | */ | |
1251 | is_active = 1; | |
1252 | if (rdev2->raid_disk < 0 || | |
1253 | test_bit(Faulty, &rdev2->flags)) | |
1254 | is_active = 0; | |
1255 | if (is_active) | |
86e6ffdd | 1256 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1257 | else |
86e6ffdd | 1258 | desc_nr = next_spare++; |
19133a42 | 1259 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1260 | d = &sb->disks[rdev2->desc_nr]; |
1261 | nr_disks++; | |
1262 | d->number = rdev2->desc_nr; | |
1263 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1264 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1265 | if (is_active) |
1da177e4 LT |
1266 | d->raid_disk = rdev2->raid_disk; |
1267 | else | |
1268 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1269 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1270 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1271 | else if (is_active) { |
1da177e4 | 1272 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1273 | if (test_bit(In_sync, &rdev2->flags)) |
1274 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1275 | active++; |
1276 | working++; | |
1277 | } else { | |
1278 | d->state = 0; | |
1279 | spare++; | |
1280 | working++; | |
1281 | } | |
8ddf9efe N |
1282 | if (test_bit(WriteMostly, &rdev2->flags)) |
1283 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1284 | } |
1da177e4 LT |
1285 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1286 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1287 | mdp_disk_t *d = &sb->disks[i]; | |
1288 | if (d->state == 0 && d->number == 0) { | |
1289 | d->number = i; | |
1290 | d->raid_disk = i; | |
1291 | d->state = (1<<MD_DISK_REMOVED); | |
1292 | d->state |= (1<<MD_DISK_FAULTY); | |
1293 | failed++; | |
1294 | } | |
1295 | } | |
1296 | sb->nr_disks = nr_disks; | |
1297 | sb->active_disks = active; | |
1298 | sb->working_disks = working; | |
1299 | sb->failed_disks = failed; | |
1300 | sb->spare_disks = spare; | |
1301 | ||
1302 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1303 | sb->sb_csum = calc_sb_csum(sb); | |
1304 | } | |
1305 | ||
0cd17fec CW |
1306 | /* |
1307 | * rdev_size_change for 0.90.0 | |
1308 | */ | |
1309 | static unsigned long long | |
3cb03002 | 1310 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1311 | { |
58c0fed4 | 1312 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1313 | return 0; /* component must fit device */ |
c3d9714e | 1314 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1315 | return 0; /* can't move bitmap */ |
57b2caa3 | 1316 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1317 | if (!num_sectors || num_sectors > rdev->sb_start) |
1318 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1319 | /* Limit to 4TB as metadata cannot record more than that. |
1320 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1321 | */ | |
667a5313 | 1322 | if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) |
27a7b260 | 1323 | num_sectors = (2ULL << 32) - 2; |
0f420358 | 1324 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1325 | rdev->sb_page); |
1326 | md_super_wait(rdev->mddev); | |
c26a44ed | 1327 | return num_sectors; |
0cd17fec CW |
1328 | } |
1329 | ||
c6563a8c N |
1330 | static int |
1331 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1332 | { | |
1333 | /* non-zero offset changes not possible with v0.90 */ | |
1334 | return new_offset == 0; | |
1335 | } | |
0cd17fec | 1336 | |
1da177e4 LT |
1337 | /* |
1338 | * version 1 superblock | |
1339 | */ | |
1340 | ||
f72ffdd6 | 1341 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
1da177e4 | 1342 | { |
1c05b4bc N |
1343 | __le32 disk_csum; |
1344 | u32 csum; | |
1da177e4 LT |
1345 | unsigned long long newcsum; |
1346 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1347 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1348 | |
1349 | disk_csum = sb->sb_csum; | |
1350 | sb->sb_csum = 0; | |
1351 | newcsum = 0; | |
1f3c9907 | 1352 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1353 | newcsum += le32_to_cpu(*isuper++); |
1354 | ||
1355 | if (size == 2) | |
1c05b4bc | 1356 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1357 | |
1358 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1359 | sb->sb_csum = disk_csum; | |
1360 | return cpu_to_le32(csum); | |
1361 | } | |
1362 | ||
2699b672 N |
1363 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1364 | int acknowledged); | |
3cb03002 | 1365 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1366 | { |
1367 | struct mdp_superblock_1 *sb; | |
1368 | int ret; | |
0f420358 | 1369 | sector_t sb_start; |
c6563a8c | 1370 | sector_t sectors; |
1da177e4 | 1371 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1372 | int bmask; |
1da177e4 LT |
1373 | |
1374 | /* | |
0f420358 | 1375 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1376 | * It is always aligned to a 4K boundary and |
1377 | * depeding on minor_version, it can be: | |
1378 | * 0: At least 8K, but less than 12K, from end of device | |
1379 | * 1: At start of device | |
1380 | * 2: 4K from start of device. | |
1381 | */ | |
1382 | switch(minor_version) { | |
1383 | case 0: | |
77304d2a | 1384 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1385 | sb_start -= 8*2; |
1386 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1387 | break; |
1388 | case 1: | |
0f420358 | 1389 | sb_start = 0; |
1da177e4 LT |
1390 | break; |
1391 | case 2: | |
0f420358 | 1392 | sb_start = 8; |
1da177e4 LT |
1393 | break; |
1394 | default: | |
1395 | return -EINVAL; | |
1396 | } | |
0f420358 | 1397 | rdev->sb_start = sb_start; |
1da177e4 | 1398 | |
0002b271 N |
1399 | /* superblock is rarely larger than 1K, but it can be larger, |
1400 | * and it is safe to read 4k, so we do that | |
1401 | */ | |
1402 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1403 | if (ret) return ret; |
1404 | ||
65a06f06 | 1405 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1406 | |
1407 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1408 | sb->major_version != cpu_to_le32(1) || | |
1409 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1410 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1411 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1412 | return -EINVAL; |
1413 | ||
1414 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1415 | printk("md: invalid superblock checksum on %s\n", | |
1416 | bdevname(rdev->bdev,b)); | |
1417 | return -EINVAL; | |
1418 | } | |
1419 | if (le64_to_cpu(sb->data_size) < 10) { | |
1420 | printk("md: data_size too small on %s\n", | |
1421 | bdevname(rdev->bdev,b)); | |
1422 | return -EINVAL; | |
1423 | } | |
c6563a8c N |
1424 | if (sb->pad0 || |
1425 | sb->pad3[0] || | |
1426 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1427 | /* Some padding is non-zero, might be a new feature */ | |
1428 | return -EINVAL; | |
e11e93fa | 1429 | |
1da177e4 LT |
1430 | rdev->preferred_minor = 0xffff; |
1431 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1432 | rdev->new_data_offset = rdev->data_offset; |
1433 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1434 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1435 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1436 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1437 | |
0002b271 | 1438 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1439 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1440 | if (rdev->sb_size & bmask) |
a1801f85 N |
1441 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1442 | ||
1443 | if (minor_version | |
0f420358 | 1444 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1445 | return -EINVAL; |
c6563a8c N |
1446 | if (minor_version |
1447 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1448 | return -EINVAL; | |
0002b271 | 1449 | |
31b65a0d N |
1450 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1451 | rdev->desc_nr = -1; | |
1452 | else | |
1453 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1454 | ||
2699b672 N |
1455 | if (!rdev->bb_page) { |
1456 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1457 | if (!rdev->bb_page) | |
1458 | return -ENOMEM; | |
1459 | } | |
1460 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1461 | rdev->badblocks.count == 0) { | |
1462 | /* need to load the bad block list. | |
1463 | * Currently we limit it to one page. | |
1464 | */ | |
1465 | s32 offset; | |
1466 | sector_t bb_sector; | |
1467 | u64 *bbp; | |
1468 | int i; | |
1469 | int sectors = le16_to_cpu(sb->bblog_size); | |
1470 | if (sectors > (PAGE_SIZE / 512)) | |
1471 | return -EINVAL; | |
1472 | offset = le32_to_cpu(sb->bblog_offset); | |
1473 | if (offset == 0) | |
1474 | return -EINVAL; | |
1475 | bb_sector = (long long)offset; | |
1476 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1477 | rdev->bb_page, READ, true)) | |
1478 | return -EIO; | |
1479 | bbp = (u64 *)page_address(rdev->bb_page); | |
1480 | rdev->badblocks.shift = sb->bblog_shift; | |
1481 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1482 | u64 bb = le64_to_cpu(*bbp); | |
1483 | int count = bb & (0x3ff); | |
1484 | u64 sector = bb >> 10; | |
1485 | sector <<= sb->bblog_shift; | |
1486 | count <<= sb->bblog_shift; | |
1487 | if (bb + 1 == 0) | |
1488 | break; | |
1489 | if (md_set_badblocks(&rdev->badblocks, | |
1490 | sector, count, 1) == 0) | |
1491 | return -EINVAL; | |
1492 | } | |
486adf72 N |
1493 | } else if (sb->bblog_offset != 0) |
1494 | rdev->badblocks.shift = 0; | |
2699b672 | 1495 | |
9a7b2b0f | 1496 | if (!refdev) { |
8ed75463 | 1497 | ret = 1; |
9a7b2b0f | 1498 | } else { |
1da177e4 | 1499 | __u64 ev1, ev2; |
65a06f06 | 1500 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1501 | |
1502 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1503 | sb->level != refsb->level || | |
1504 | sb->layout != refsb->layout || | |
1505 | sb->chunksize != refsb->chunksize) { | |
1506 | printk(KERN_WARNING "md: %s has strangely different" | |
1507 | " superblock to %s\n", | |
1508 | bdevname(rdev->bdev,b), | |
1509 | bdevname(refdev->bdev,b2)); | |
1510 | return -EINVAL; | |
1511 | } | |
1512 | ev1 = le64_to_cpu(sb->events); | |
1513 | ev2 = le64_to_cpu(refsb->events); | |
1514 | ||
1515 | if (ev1 > ev2) | |
8ed75463 N |
1516 | ret = 1; |
1517 | else | |
1518 | ret = 0; | |
1da177e4 | 1519 | } |
c6563a8c N |
1520 | if (minor_version) { |
1521 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1522 | sectors -= rdev->data_offset; | |
1523 | } else | |
1524 | sectors = rdev->sb_start; | |
1525 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1526 | return -EINVAL; |
dd8ac336 | 1527 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1528 | return ret; |
1da177e4 LT |
1529 | } |
1530 | ||
fd01b88c | 1531 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1532 | { |
65a06f06 | 1533 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1534 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1535 | |
41158c7e | 1536 | rdev->raid_disk = -1; |
c5d79adb N |
1537 | clear_bit(Faulty, &rdev->flags); |
1538 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1539 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1540 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1541 | |
1da177e4 LT |
1542 | if (mddev->raid_disks == 0) { |
1543 | mddev->major_version = 1; | |
1544 | mddev->patch_version = 0; | |
e691063a | 1545 | mddev->external = 0; |
9d8f0363 | 1546 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1547 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1548 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1549 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1550 | mddev->clevel[0] = 0; |
1da177e4 LT |
1551 | mddev->layout = le32_to_cpu(sb->layout); |
1552 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1553 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1554 | mddev->events = ev1; |
c3d9714e | 1555 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1556 | mddev->bitmap_info.space = 0; |
1557 | /* Default location for bitmap is 1K after superblock | |
1558 | * using 3K - total of 4K | |
1559 | */ | |
c3d9714e | 1560 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1561 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1562 | mddev->reshape_backwards = 0; |
1563 | ||
1da177e4 LT |
1564 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1565 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1566 | ||
1567 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1568 | |
71c0805c | 1569 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1570 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1571 | mddev->bitmap_info.offset = |
1572 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1573 | /* Metadata doesn't record how much space is available. |
1574 | * For 1.0, we assume we can use up to the superblock | |
1575 | * if before, else to 4K beyond superblock. | |
1576 | * For others, assume no change is possible. | |
1577 | */ | |
1578 | if (mddev->minor_version > 0) | |
1579 | mddev->bitmap_info.space = 0; | |
1580 | else if (mddev->bitmap_info.offset > 0) | |
1581 | mddev->bitmap_info.space = | |
1582 | 8 - mddev->bitmap_info.offset; | |
1583 | else | |
1584 | mddev->bitmap_info.space = | |
1585 | -mddev->bitmap_info.offset; | |
1586 | } | |
e11e93fa | 1587 | |
f6705578 N |
1588 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1589 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1590 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1591 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1592 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1593 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1594 | if (mddev->delta_disks < 0 || |
1595 | (mddev->delta_disks == 0 && | |
1596 | (le32_to_cpu(sb->feature_map) | |
1597 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1598 | mddev->reshape_backwards = 1; | |
f6705578 N |
1599 | } else { |
1600 | mddev->reshape_position = MaxSector; | |
1601 | mddev->delta_disks = 0; | |
1602 | mddev->new_level = mddev->level; | |
1603 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1604 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1605 | } |
1606 | ||
41158c7e | 1607 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1608 | /* Insist of good event counter while assembling, except for |
1609 | * spares (which don't need an event count) */ | |
1da177e4 | 1610 | ++ev1; |
be6800a7 N |
1611 | if (rdev->desc_nr >= 0 && |
1612 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
a3dfbdaa SL |
1613 | (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || |
1614 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)) | |
be6800a7 N |
1615 | if (ev1 < mddev->events) |
1616 | return -EINVAL; | |
41158c7e N |
1617 | } else if (mddev->bitmap) { |
1618 | /* If adding to array with a bitmap, then we can accept an | |
1619 | * older device, but not too old. | |
1620 | */ | |
41158c7e N |
1621 | if (ev1 < mddev->bitmap->events_cleared) |
1622 | return 0; | |
8313b8e5 N |
1623 | if (ev1 < mddev->events) |
1624 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1625 | } else { |
1626 | if (ev1 < mddev->events) | |
1627 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1628 | return 0; | |
1629 | } | |
1da177e4 LT |
1630 | if (mddev->level != LEVEL_MULTIPATH) { |
1631 | int role; | |
3673f305 N |
1632 | if (rdev->desc_nr < 0 || |
1633 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
c4d4c91b | 1634 | role = MD_DISK_ROLE_SPARE; |
3673f305 N |
1635 | rdev->desc_nr = -1; |
1636 | } else | |
1637 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 | 1638 | switch(role) { |
c4d4c91b | 1639 | case MD_DISK_ROLE_SPARE: /* spare */ |
1da177e4 | 1640 | break; |
c4d4c91b | 1641 | case MD_DISK_ROLE_FAULTY: /* faulty */ |
b2d444d7 | 1642 | set_bit(Faulty, &rdev->flags); |
1da177e4 | 1643 | break; |
bac624f3 SL |
1644 | case MD_DISK_ROLE_JOURNAL: /* journal device */ |
1645 | if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { | |
1646 | /* journal device without journal feature */ | |
1647 | printk(KERN_WARNING | |
1648 | "md: journal device provided without journal feature, ignoring the device\n"); | |
1649 | return -EINVAL; | |
1650 | } | |
1651 | set_bit(Journal, &rdev->flags); | |
3069aa8d | 1652 | rdev->journal_tail = le64_to_cpu(sb->journal_tail); |
bd18f646 SL |
1653 | if (mddev->recovery_cp == MaxSector) |
1654 | set_bit(MD_JOURNAL_CLEAN, &mddev->flags); | |
f2076e7d | 1655 | rdev->raid_disk = mddev->raid_disks; |
bac624f3 | 1656 | break; |
1da177e4 | 1657 | default: |
f466722c | 1658 | rdev->saved_raid_disk = role; |
5fd6c1dc | 1659 | if ((le32_to_cpu(sb->feature_map) & |
f466722c | 1660 | MD_FEATURE_RECOVERY_OFFSET)) { |
5fd6c1dc | 1661 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
f466722c N |
1662 | if (!(le32_to_cpu(sb->feature_map) & |
1663 | MD_FEATURE_RECOVERY_BITMAP)) | |
1664 | rdev->saved_raid_disk = -1; | |
1665 | } else | |
5fd6c1dc | 1666 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1667 | rdev->raid_disk = role; |
1668 | break; | |
1669 | } | |
8ddf9efe N |
1670 | if (sb->devflags & WriteMostly1) |
1671 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1672 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1673 | set_bit(Replacement, &rdev->flags); | |
a97b7896 SL |
1674 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) |
1675 | set_bit(MD_HAS_JOURNAL, &mddev->flags); | |
41158c7e | 1676 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1677 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1678 | |
1da177e4 LT |
1679 | return 0; |
1680 | } | |
1681 | ||
fd01b88c | 1682 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1683 | { |
1684 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1685 | struct md_rdev *rdev2; |
1da177e4 LT |
1686 | int max_dev, i; |
1687 | /* make rdev->sb match mddev and rdev data. */ | |
1688 | ||
65a06f06 | 1689 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1690 | |
1691 | sb->feature_map = 0; | |
1692 | sb->pad0 = 0; | |
5fd6c1dc | 1693 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1694 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1695 | ||
1696 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1697 | sb->events = cpu_to_le64(mddev->events); | |
1698 | if (mddev->in_sync) | |
1699 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
bd18f646 SL |
1700 | else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags)) |
1701 | sb->resync_offset = cpu_to_le64(MaxSector); | |
1da177e4 LT |
1702 | else |
1703 | sb->resync_offset = cpu_to_le64(0); | |
1704 | ||
1c05b4bc | 1705 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1706 | |
f0ca340c | 1707 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1708 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1709 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1710 | sb->level = cpu_to_le32(mddev->level); |
1711 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1712 | |
aeb9b211 N |
1713 | if (test_bit(WriteMostly, &rdev->flags)) |
1714 | sb->devflags |= WriteMostly1; | |
1715 | else | |
1716 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1717 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1718 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1719 | |
c3d9714e N |
1720 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1721 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1722 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1723 | } |
5fd6c1dc | 1724 | |
f2076e7d | 1725 | if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) && |
97e4f42d | 1726 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1727 | sb->feature_map |= |
1728 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1729 | sb->recovery_offset = | |
1730 | cpu_to_le64(rdev->recovery_offset); | |
f466722c N |
1731 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
1732 | sb->feature_map |= | |
1733 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); | |
5fd6c1dc | 1734 | } |
3069aa8d SL |
1735 | /* Note: recovery_offset and journal_tail share space */ |
1736 | if (test_bit(Journal, &rdev->flags)) | |
1737 | sb->journal_tail = cpu_to_le64(rdev->journal_tail); | |
2d78f8c4 N |
1738 | if (test_bit(Replacement, &rdev->flags)) |
1739 | sb->feature_map |= | |
1740 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1741 | |
f6705578 N |
1742 | if (mddev->reshape_position != MaxSector) { |
1743 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1744 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1745 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1746 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1747 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1748 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1749 | if (mddev->delta_disks == 0 && |
1750 | mddev->reshape_backwards) | |
1751 | sb->feature_map | |
1752 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1753 | if (rdev->new_data_offset != rdev->data_offset) { |
1754 | sb->feature_map | |
1755 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1756 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1757 | - rdev->data_offset)); | |
1758 | } | |
f6705578 | 1759 | } |
a654b9d8 | 1760 | |
3c462c88 GR |
1761 | if (mddev_is_clustered(mddev)) |
1762 | sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED); | |
1763 | ||
2699b672 N |
1764 | if (rdev->badblocks.count == 0) |
1765 | /* Nothing to do for bad blocks*/ ; | |
1766 | else if (sb->bblog_offset == 0) | |
1767 | /* Cannot record bad blocks on this device */ | |
1768 | md_error(mddev, rdev); | |
1769 | else { | |
1770 | struct badblocks *bb = &rdev->badblocks; | |
1771 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1772 | u64 *p = bb->page; | |
1773 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1774 | if (bb->changed) { | |
1775 | unsigned seq; | |
1776 | ||
1777 | retry: | |
1778 | seq = read_seqbegin(&bb->lock); | |
1779 | ||
1780 | memset(bbp, 0xff, PAGE_SIZE); | |
1781 | ||
1782 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1783 | u64 internal_bb = p[i]; |
2699b672 N |
1784 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1785 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1786 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1787 | } |
d0962936 | 1788 | bb->changed = 0; |
2699b672 N |
1789 | if (read_seqretry(&bb->lock, seq)) |
1790 | goto retry; | |
1791 | ||
1792 | bb->sector = (rdev->sb_start + | |
1793 | (int)le32_to_cpu(sb->bblog_offset)); | |
1794 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1795 | } |
1796 | } | |
1797 | ||
1da177e4 | 1798 | max_dev = 0; |
dafb20fa | 1799 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1800 | if (rdev2->desc_nr+1 > max_dev) |
1801 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1802 | |
70471daf N |
1803 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1804 | int bmask; | |
a778b73f | 1805 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1806 | rdev->sb_size = max_dev * 2 + 256; |
1807 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1808 | if (rdev->sb_size & bmask) | |
1809 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1810 | } else |
1811 | max_dev = le32_to_cpu(sb->max_dev); | |
1812 | ||
1da177e4 | 1813 | for (i=0; i<max_dev;i++) |
c4d4c91b | 1814 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); |
f72ffdd6 | 1815 | |
a97b7896 SL |
1816 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) |
1817 | sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL); | |
f72ffdd6 | 1818 | |
dafb20fa | 1819 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1820 | i = rdev2->desc_nr; |
b2d444d7 | 1821 | if (test_bit(Faulty, &rdev2->flags)) |
c4d4c91b | 1822 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); |
b2d444d7 | 1823 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1824 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
a97b7896 | 1825 | else if (test_bit(Journal, &rdev2->flags)) |
bac624f3 | 1826 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL); |
93be75ff | 1827 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1828 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 | 1829 | else |
c4d4c91b | 1830 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); |
1da177e4 LT |
1831 | } |
1832 | ||
1da177e4 LT |
1833 | sb->sb_csum = calc_sb_1_csum(sb); |
1834 | } | |
1835 | ||
0cd17fec | 1836 | static unsigned long long |
3cb03002 | 1837 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1838 | { |
1839 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1840 | sector_t max_sectors; |
58c0fed4 | 1841 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1842 | return 0; /* component must fit device */ |
c6563a8c N |
1843 | if (rdev->data_offset != rdev->new_data_offset) |
1844 | return 0; /* too confusing */ | |
0f420358 | 1845 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1846 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1847 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1848 | max_sectors -= rdev->data_offset; |
1849 | if (!num_sectors || num_sectors > max_sectors) | |
1850 | num_sectors = max_sectors; | |
c3d9714e | 1851 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1852 | /* minor version 0 with bitmap we can't move */ |
1853 | return 0; | |
1854 | } else { | |
1855 | /* minor version 0; superblock after data */ | |
0f420358 | 1856 | sector_t sb_start; |
77304d2a | 1857 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1858 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1859 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1860 | if (!num_sectors || num_sectors > max_sectors) |
1861 | num_sectors = max_sectors; | |
0f420358 | 1862 | rdev->sb_start = sb_start; |
0cd17fec | 1863 | } |
65a06f06 | 1864 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1865 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1866 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1867 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1868 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1869 | rdev->sb_page); |
1870 | md_super_wait(rdev->mddev); | |
c26a44ed | 1871 | return num_sectors; |
c6563a8c N |
1872 | |
1873 | } | |
1874 | ||
1875 | static int | |
1876 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1877 | unsigned long long new_offset) | |
1878 | { | |
1879 | /* All necessary checks on new >= old have been done */ | |
1880 | struct bitmap *bitmap; | |
1881 | if (new_offset >= rdev->data_offset) | |
1882 | return 1; | |
1883 | ||
1884 | /* with 1.0 metadata, there is no metadata to tread on | |
1885 | * so we can always move back */ | |
1886 | if (rdev->mddev->minor_version == 0) | |
1887 | return 1; | |
1888 | ||
1889 | /* otherwise we must be sure not to step on | |
1890 | * any metadata, so stay: | |
1891 | * 36K beyond start of superblock | |
1892 | * beyond end of badblocks | |
1893 | * beyond write-intent bitmap | |
1894 | */ | |
1895 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1896 | return 0; | |
1897 | bitmap = rdev->mddev->bitmap; | |
1898 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1899 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 1900 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
1901 | return 0; |
1902 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1903 | return 0; | |
1904 | ||
1905 | return 1; | |
0cd17fec | 1906 | } |
1da177e4 | 1907 | |
75c96f85 | 1908 | static struct super_type super_types[] = { |
1da177e4 LT |
1909 | [0] = { |
1910 | .name = "0.90.0", | |
1911 | .owner = THIS_MODULE, | |
0cd17fec CW |
1912 | .load_super = super_90_load, |
1913 | .validate_super = super_90_validate, | |
1914 | .sync_super = super_90_sync, | |
1915 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1916 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1917 | }, |
1918 | [1] = { | |
1919 | .name = "md-1", | |
1920 | .owner = THIS_MODULE, | |
0cd17fec CW |
1921 | .load_super = super_1_load, |
1922 | .validate_super = super_1_validate, | |
1923 | .sync_super = super_1_sync, | |
1924 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1925 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1926 | }, |
1927 | }; | |
1da177e4 | 1928 | |
fd01b88c | 1929 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1930 | { |
1931 | if (mddev->sync_super) { | |
1932 | mddev->sync_super(mddev, rdev); | |
1933 | return; | |
1934 | } | |
1935 | ||
1936 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1937 | ||
1938 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1939 | } | |
1940 | ||
fd01b88c | 1941 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1942 | { |
3cb03002 | 1943 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1944 | |
4b80991c | 1945 | rcu_read_lock(); |
0b020e85 SL |
1946 | rdev_for_each_rcu(rdev, mddev1) { |
1947 | if (test_bit(Faulty, &rdev->flags) || | |
1948 | test_bit(Journal, &rdev->flags) || | |
1949 | rdev->raid_disk == -1) | |
1950 | continue; | |
1951 | rdev_for_each_rcu(rdev2, mddev2) { | |
1952 | if (test_bit(Faulty, &rdev2->flags) || | |
1953 | test_bit(Journal, &rdev2->flags) || | |
1954 | rdev2->raid_disk == -1) | |
1955 | continue; | |
7dd5e7c3 | 1956 | if (rdev->bdev->bd_contains == |
4b80991c N |
1957 | rdev2->bdev->bd_contains) { |
1958 | rcu_read_unlock(); | |
7dd5e7c3 | 1959 | return 1; |
4b80991c | 1960 | } |
0b020e85 SL |
1961 | } |
1962 | } | |
4b80991c | 1963 | rcu_read_unlock(); |
1da177e4 LT |
1964 | return 0; |
1965 | } | |
1966 | ||
1967 | static LIST_HEAD(pending_raid_disks); | |
1968 | ||
ac5e7113 AN |
1969 | /* |
1970 | * Try to register data integrity profile for an mddev | |
1971 | * | |
1972 | * This is called when an array is started and after a disk has been kicked | |
1973 | * from the array. It only succeeds if all working and active component devices | |
1974 | * are integrity capable with matching profiles. | |
1975 | */ | |
fd01b88c | 1976 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1977 | { |
3cb03002 | 1978 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1979 | |
1980 | if (list_empty(&mddev->disks)) | |
1981 | return 0; /* nothing to do */ | |
629acb6a JB |
1982 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1983 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 1984 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
1985 | /* skip spares and non-functional disks */ |
1986 | if (test_bit(Faulty, &rdev->flags)) | |
1987 | continue; | |
1988 | if (rdev->raid_disk < 0) | |
1989 | continue; | |
ac5e7113 AN |
1990 | if (!reference) { |
1991 | /* Use the first rdev as the reference */ | |
1992 | reference = rdev; | |
1993 | continue; | |
1994 | } | |
1995 | /* does this rdev's profile match the reference profile? */ | |
1996 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1997 | rdev->bdev->bd_disk) < 0) | |
1998 | return -EINVAL; | |
1999 | } | |
89078d57 MP |
2000 | if (!reference || !bdev_get_integrity(reference->bdev)) |
2001 | return 0; | |
ac5e7113 AN |
2002 | /* |
2003 | * All component devices are integrity capable and have matching | |
2004 | * profiles, register the common profile for the md device. | |
2005 | */ | |
25520d55 MP |
2006 | blk_integrity_register(mddev->gendisk, |
2007 | bdev_get_integrity(reference->bdev)); | |
2008 | ||
a91a2785 MP |
2009 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
2010 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
2011 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
2012 | mdname(mddev)); | |
2013 | return -EINVAL; | |
2014 | } | |
ac5e7113 AN |
2015 | return 0; |
2016 | } | |
2017 | EXPORT_SYMBOL(md_integrity_register); | |
2018 | ||
2019 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 2020 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 2021 | { |
2863b9eb JB |
2022 | struct blk_integrity *bi_rdev; |
2023 | struct blk_integrity *bi_mddev; | |
2024 | ||
2025 | if (!mddev->gendisk) | |
2026 | return; | |
2027 | ||
2028 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
2029 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 2030 | |
ac5e7113 | 2031 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 2032 | return; |
ac5e7113 | 2033 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 2034 | return; |
ac5e7113 AN |
2035 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2036 | rdev->bdev->bd_disk) >= 0) | |
2037 | return; | |
c7bfced9 | 2038 | WARN_ON_ONCE(!mddev->suspended); |
ac5e7113 AN |
2039 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); |
2040 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2041 | } |
ac5e7113 | 2042 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2043 | |
f72ffdd6 | 2044 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 2045 | { |
7dd5e7c3 | 2046 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2047 | struct kobject *ko; |
5e55e2f5 | 2048 | int err; |
1da177e4 | 2049 | |
11e2ede0 DW |
2050 | /* prevent duplicates */ |
2051 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2052 | return -EEXIST; | |
2053 | ||
dd8ac336 AN |
2054 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2055 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2056 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2057 | if (mddev->pers) { |
2058 | /* Cannot change size, so fail | |
2059 | * If mddev->level <= 0, then we don't care | |
2060 | * about aligning sizes (e.g. linear) | |
2061 | */ | |
2062 | if (mddev->level > 0) | |
2063 | return -ENOSPC; | |
2064 | } else | |
dd8ac336 | 2065 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2066 | } |
1da177e4 LT |
2067 | |
2068 | /* Verify rdev->desc_nr is unique. | |
2069 | * If it is -1, assign a free number, else | |
2070 | * check number is not in use | |
2071 | */ | |
4878e9eb | 2072 | rcu_read_lock(); |
1da177e4 LT |
2073 | if (rdev->desc_nr < 0) { |
2074 | int choice = 0; | |
4878e9eb N |
2075 | if (mddev->pers) |
2076 | choice = mddev->raid_disks; | |
57d051dc | 2077 | while (md_find_rdev_nr_rcu(mddev, choice)) |
1da177e4 LT |
2078 | choice++; |
2079 | rdev->desc_nr = choice; | |
2080 | } else { | |
57d051dc | 2081 | if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
4878e9eb | 2082 | rcu_read_unlock(); |
1da177e4 | 2083 | return -EBUSY; |
4878e9eb | 2084 | } |
1da177e4 | 2085 | } |
4878e9eb | 2086 | rcu_read_unlock(); |
de01dfad N |
2087 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2088 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2089 | mdname(mddev), mddev->max_disks); | |
2090 | return -EBUSY; | |
2091 | } | |
19133a42 | 2092 | bdevname(rdev->bdev,b); |
90a9befb | 2093 | strreplace(b, '/', '!'); |
649316b2 | 2094 | |
1da177e4 | 2095 | rdev->mddev = mddev; |
19133a42 | 2096 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2097 | |
b2d6db58 | 2098 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2099 | goto fail; |
86e6ffdd | 2100 | |
0762b8bd | 2101 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2102 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2103 | /* failure here is OK */; | |
2104 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2105 | |
4b80991c | 2106 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2107 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2108 | |
2109 | /* May as well allow recovery to be retried once */ | |
5389042f | 2110 | mddev->recovery_disabled++; |
3f9d99c1 | 2111 | |
1da177e4 | 2112 | return 0; |
5e55e2f5 N |
2113 | |
2114 | fail: | |
2115 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2116 | b, mdname(mddev)); | |
2117 | return err; | |
1da177e4 LT |
2118 | } |
2119 | ||
177a99b2 | 2120 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2121 | { |
3cb03002 | 2122 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2123 | kobject_del(&rdev->kobj); |
177a99b2 | 2124 | kobject_put(&rdev->kobj); |
5792a285 N |
2125 | } |
2126 | ||
f72ffdd6 | 2127 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2128 | { |
2129 | char b[BDEVNAME_SIZE]; | |
403df478 | 2130 | |
49731baa | 2131 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2132 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2133 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2134 | rdev->mddev = NULL; | |
86e6ffdd | 2135 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2136 | sysfs_put(rdev->sysfs_state); |
2137 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2138 | rdev->badblocks.count = 0; |
5792a285 | 2139 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2140 | * writing to 'remove' to "dev/state". We also need |
2141 | * to delay it due to rcu usage. | |
5792a285 | 2142 | */ |
4b80991c | 2143 | synchronize_rcu(); |
177a99b2 N |
2144 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2145 | kobject_get(&rdev->kobj); | |
e804ac78 | 2146 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2147 | } |
2148 | ||
2149 | /* | |
2150 | * prevent the device from being mounted, repartitioned or | |
2151 | * otherwise reused by a RAID array (or any other kernel | |
2152 | * subsystem), by bd_claiming the device. | |
2153 | */ | |
3cb03002 | 2154 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2155 | { |
2156 | int err = 0; | |
2157 | struct block_device *bdev; | |
2158 | char b[BDEVNAME_SIZE]; | |
2159 | ||
d4d77629 | 2160 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2161 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2162 | if (IS_ERR(bdev)) { |
2163 | printk(KERN_ERR "md: could not open %s.\n", | |
2164 | __bdevname(dev, b)); | |
2165 | return PTR_ERR(bdev); | |
2166 | } | |
1da177e4 LT |
2167 | rdev->bdev = bdev; |
2168 | return err; | |
2169 | } | |
2170 | ||
3cb03002 | 2171 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2172 | { |
2173 | struct block_device *bdev = rdev->bdev; | |
2174 | rdev->bdev = NULL; | |
e525fd89 | 2175 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2176 | } |
2177 | ||
2178 | void md_autodetect_dev(dev_t dev); | |
2179 | ||
f72ffdd6 | 2180 | static void export_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2181 | { |
2182 | char b[BDEVNAME_SIZE]; | |
403df478 | 2183 | |
1da177e4 LT |
2184 | printk(KERN_INFO "md: export_rdev(%s)\n", |
2185 | bdevname(rdev->bdev,b)); | |
545c8795 | 2186 | md_rdev_clear(rdev); |
1da177e4 | 2187 | #ifndef MODULE |
d0fae18f N |
2188 | if (test_bit(AutoDetected, &rdev->flags)) |
2189 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2190 | #endif |
2191 | unlock_rdev(rdev); | |
86e6ffdd | 2192 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2193 | } |
2194 | ||
fb56dfef | 2195 | void md_kick_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2196 | { |
2197 | unbind_rdev_from_array(rdev); | |
2198 | export_rdev(rdev); | |
2199 | } | |
fb56dfef | 2200 | EXPORT_SYMBOL_GPL(md_kick_rdev_from_array); |
1da177e4 | 2201 | |
fd01b88c | 2202 | static void export_array(struct mddev *mddev) |
1da177e4 | 2203 | { |
0638bb0e | 2204 | struct md_rdev *rdev; |
1da177e4 | 2205 | |
0638bb0e N |
2206 | while (!list_empty(&mddev->disks)) { |
2207 | rdev = list_first_entry(&mddev->disks, struct md_rdev, | |
2208 | same_set); | |
fb56dfef | 2209 | md_kick_rdev_from_array(rdev); |
1da177e4 | 2210 | } |
1da177e4 LT |
2211 | mddev->raid_disks = 0; |
2212 | mddev->major_version = 0; | |
2213 | } | |
2214 | ||
f72ffdd6 | 2215 | static void sync_sbs(struct mddev *mddev, int nospares) |
1da177e4 | 2216 | { |
42543769 N |
2217 | /* Update each superblock (in-memory image), but |
2218 | * if we are allowed to, skip spares which already | |
2219 | * have the right event counter, or have one earlier | |
2220 | * (which would mean they aren't being marked as dirty | |
2221 | * with the rest of the array) | |
2222 | */ | |
3cb03002 | 2223 | struct md_rdev *rdev; |
dafb20fa | 2224 | rdev_for_each(rdev, mddev) { |
42543769 N |
2225 | if (rdev->sb_events == mddev->events || |
2226 | (nospares && | |
2227 | rdev->raid_disk < 0 && | |
42543769 N |
2228 | rdev->sb_events+1 == mddev->events)) { |
2229 | /* Don't update this superblock */ | |
2230 | rdev->sb_loaded = 2; | |
2231 | } else { | |
076f968b | 2232 | sync_super(mddev, rdev); |
42543769 N |
2233 | rdev->sb_loaded = 1; |
2234 | } | |
1da177e4 LT |
2235 | } |
2236 | } | |
2237 | ||
2aa82191 GR |
2238 | static bool does_sb_need_changing(struct mddev *mddev) |
2239 | { | |
2240 | struct md_rdev *rdev; | |
2241 | struct mdp_superblock_1 *sb; | |
2242 | int role; | |
2243 | ||
2244 | /* Find a good rdev */ | |
2245 | rdev_for_each(rdev, mddev) | |
2246 | if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags)) | |
2247 | break; | |
2248 | ||
2249 | /* No good device found. */ | |
2250 | if (!rdev) | |
2251 | return false; | |
2252 | ||
2253 | sb = page_address(rdev->sb_page); | |
2254 | /* Check if a device has become faulty or a spare become active */ | |
2255 | rdev_for_each(rdev, mddev) { | |
2256 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
2257 | /* Device activated? */ | |
2258 | if (role == 0xffff && rdev->raid_disk >=0 && | |
2259 | !test_bit(Faulty, &rdev->flags)) | |
2260 | return true; | |
2261 | /* Device turned faulty? */ | |
2262 | if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd)) | |
2263 | return true; | |
2264 | } | |
2265 | ||
2266 | /* Check if any mddev parameters have changed */ | |
2267 | if ((mddev->dev_sectors != le64_to_cpu(sb->size)) || | |
2268 | (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) || | |
2aa82191 GR |
2269 | (mddev->layout != le64_to_cpu(sb->layout)) || |
2270 | (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || | |
2271 | (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) | |
2272 | return true; | |
2273 | ||
2274 | return false; | |
2275 | } | |
2276 | ||
1aee41f6 | 2277 | void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2278 | { |
3cb03002 | 2279 | struct md_rdev *rdev; |
06d91a5f | 2280 | int sync_req; |
42543769 | 2281 | int nospares = 0; |
2699b672 | 2282 | int any_badblocks_changed = 0; |
23b63f9f | 2283 | int ret = -1; |
1da177e4 | 2284 | |
d87f064f N |
2285 | if (mddev->ro) { |
2286 | if (force_change) | |
2287 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2288 | return; | |
2289 | } | |
2aa82191 GR |
2290 | |
2291 | if (mddev_is_clustered(mddev)) { | |
2292 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
2293 | force_change = 1; | |
23b63f9f | 2294 | ret = md_cluster_ops->metadata_update_start(mddev); |
2aa82191 GR |
2295 | /* Has someone else has updated the sb */ |
2296 | if (!does_sb_need_changing(mddev)) { | |
23b63f9f GJ |
2297 | if (ret == 0) |
2298 | md_cluster_ops->metadata_update_cancel(mddev); | |
2aa82191 GR |
2299 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
2300 | return; | |
2301 | } | |
2302 | } | |
1da177e4 | 2303 | repeat: |
3a3a5ddb | 2304 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2305 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2306 | if (rdev->raid_disk >= 0 && |
2307 | mddev->delta_disks >= 0 && | |
f2076e7d | 2308 | !test_bit(Journal, &rdev->flags) && |
3a3a5ddb N |
2309 | !test_bit(In_sync, &rdev->flags) && |
2310 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2311 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2312 | ||
f72ffdd6 | 2313 | } |
bd52b746 | 2314 | if (!mddev->persistent) { |
070dc6dd | 2315 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2316 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2317 | if (!mddev->external) { |
d97a41dc | 2318 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2319 | rdev_for_each(rdev, mddev) { |
de393cde | 2320 | if (rdev->badblocks.changed) { |
d0962936 | 2321 | rdev->badblocks.changed = 0; |
de393cde N |
2322 | md_ack_all_badblocks(&rdev->badblocks); |
2323 | md_error(mddev, rdev); | |
2324 | } | |
2325 | clear_bit(Blocked, &rdev->flags); | |
2326 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2327 | wake_up(&rdev->blocked_wait); | |
2328 | } | |
2329 | } | |
3a3a5ddb N |
2330 | wake_up(&mddev->sb_wait); |
2331 | return; | |
2332 | } | |
2333 | ||
85572d7c | 2334 | spin_lock(&mddev->lock); |
84692195 | 2335 | |
3a3a5ddb N |
2336 | mddev->utime = get_seconds(); |
2337 | ||
850b2b42 N |
2338 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2339 | force_change = 1; | |
2340 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2341 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2342 | * though if events isn't the right even/odd, we will have to do | |
2343 | * spares after all | |
2344 | */ | |
2345 | nospares = 1; | |
2346 | if (force_change) | |
2347 | nospares = 0; | |
2348 | if (mddev->degraded) | |
84692195 N |
2349 | /* If the array is degraded, then skipping spares is both |
2350 | * dangerous and fairly pointless. | |
2351 | * Dangerous because a device that was removed from the array | |
2352 | * might have a event_count that still looks up-to-date, | |
2353 | * so it can be re-added without a resync. | |
2354 | * Pointless because if there are any spares to skip, | |
2355 | * then a recovery will happen and soon that array won't | |
2356 | * be degraded any more and the spare can go back to sleep then. | |
2357 | */ | |
850b2b42 | 2358 | nospares = 0; |
84692195 | 2359 | |
06d91a5f | 2360 | sync_req = mddev->in_sync; |
42543769 N |
2361 | |
2362 | /* If this is just a dirty<->clean transition, and the array is clean | |
2363 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2364 | if (nospares |
42543769 | 2365 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2366 | && mddev->can_decrease_events |
2367 | && mddev->events != 1) { | |
42543769 | 2368 | mddev->events--; |
a8707c08 N |
2369 | mddev->can_decrease_events = 0; |
2370 | } else { | |
42543769 N |
2371 | /* otherwise we have to go forward and ... */ |
2372 | mddev->events ++; | |
a8707c08 | 2373 | mddev->can_decrease_events = nospares; |
42543769 | 2374 | } |
1da177e4 | 2375 | |
403df478 N |
2376 | /* |
2377 | * This 64-bit counter should never wrap. | |
2378 | * Either we are in around ~1 trillion A.C., assuming | |
2379 | * 1 reboot per second, or we have a bug... | |
2380 | */ | |
2381 | WARN_ON(mddev->events == 0); | |
2699b672 | 2382 | |
dafb20fa | 2383 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2384 | if (rdev->badblocks.changed) |
2385 | any_badblocks_changed++; | |
de393cde N |
2386 | if (test_bit(Faulty, &rdev->flags)) |
2387 | set_bit(FaultRecorded, &rdev->flags); | |
2388 | } | |
2699b672 | 2389 | |
e691063a | 2390 | sync_sbs(mddev, nospares); |
85572d7c | 2391 | spin_unlock(&mddev->lock); |
1da177e4 | 2392 | |
36a4e1fe N |
2393 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2394 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2395 | |
4ad13663 | 2396 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2397 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2398 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2399 | |
42543769 N |
2400 | if (rdev->sb_loaded != 1) |
2401 | continue; /* no noise on spare devices */ | |
1da177e4 | 2402 | |
f466722c | 2403 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2404 | md_super_write(mddev,rdev, |
0f420358 | 2405 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2406 | rdev->sb_page); |
36a4e1fe N |
2407 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2408 | bdevname(rdev->bdev, b), | |
2409 | (unsigned long long)rdev->sb_start); | |
42543769 | 2410 | rdev->sb_events = mddev->events; |
2699b672 N |
2411 | if (rdev->badblocks.size) { |
2412 | md_super_write(mddev, rdev, | |
2413 | rdev->badblocks.sector, | |
2414 | rdev->badblocks.size << 9, | |
2415 | rdev->bb_page); | |
2416 | rdev->badblocks.size = 0; | |
2417 | } | |
7bfa19f2 | 2418 | |
f466722c | 2419 | } else |
36a4e1fe N |
2420 | pr_debug("md: %s (skipping faulty)\n", |
2421 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2422 | |
7bfa19f2 | 2423 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2424 | /* only need to write one superblock... */ |
2425 | break; | |
2426 | } | |
a9701a30 | 2427 | md_super_wait(mddev); |
850b2b42 | 2428 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2429 | |
85572d7c | 2430 | spin_lock(&mddev->lock); |
850b2b42 N |
2431 | if (mddev->in_sync != sync_req || |
2432 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2433 | /* have to write it out again */ |
85572d7c | 2434 | spin_unlock(&mddev->lock); |
06d91a5f N |
2435 | goto repeat; |
2436 | } | |
850b2b42 | 2437 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
85572d7c | 2438 | spin_unlock(&mddev->lock); |
3d310eb7 | 2439 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2440 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2441 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2442 | |
dafb20fa | 2443 | rdev_for_each(rdev, mddev) { |
de393cde N |
2444 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2445 | clear_bit(Blocked, &rdev->flags); | |
2446 | ||
2447 | if (any_badblocks_changed) | |
2699b672 | 2448 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2449 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2450 | wake_up(&rdev->blocked_wait); | |
2451 | } | |
2aa82191 | 2452 | |
23b63f9f | 2453 | if (mddev_is_clustered(mddev) && ret == 0) |
2aa82191 | 2454 | md_cluster_ops->metadata_update_finish(mddev); |
1da177e4 | 2455 | } |
1aee41f6 | 2456 | EXPORT_SYMBOL(md_update_sb); |
1da177e4 | 2457 | |
a6da4ef8 GR |
2458 | static int add_bound_rdev(struct md_rdev *rdev) |
2459 | { | |
2460 | struct mddev *mddev = rdev->mddev; | |
2461 | int err = 0; | |
2462 | ||
2463 | if (!mddev->pers->hot_remove_disk) { | |
2464 | /* If there is hot_add_disk but no hot_remove_disk | |
2465 | * then added disks for geometry changes, | |
2466 | * and should be added immediately. | |
2467 | */ | |
2468 | super_types[mddev->major_version]. | |
2469 | validate_super(mddev, rdev); | |
2470 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
2471 | if (err) { | |
2472 | unbind_rdev_from_array(rdev); | |
2473 | export_rdev(rdev); | |
2474 | return err; | |
2475 | } | |
2476 | } | |
2477 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
2478 | ||
2479 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2480 | if (mddev->degraded) | |
2481 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
2482 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2483 | md_new_event(mddev); | |
2484 | md_wakeup_thread(mddev->thread); | |
2485 | return 0; | |
2486 | } | |
1da177e4 | 2487 | |
7f6ce769 | 2488 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2489 | * We want to accept with case. For this we use cmd_match. |
2490 | */ | |
2491 | static int cmd_match(const char *cmd, const char *str) | |
2492 | { | |
2493 | /* See if cmd, written into a sysfs file, matches | |
2494 | * str. They must either be the same, or cmd can | |
2495 | * have a trailing newline | |
2496 | */ | |
2497 | while (*cmd && *str && *cmd == *str) { | |
2498 | cmd++; | |
2499 | str++; | |
2500 | } | |
2501 | if (*cmd == '\n') | |
2502 | cmd++; | |
2503 | if (*str || *cmd) | |
2504 | return 0; | |
2505 | return 1; | |
2506 | } | |
2507 | ||
86e6ffdd N |
2508 | struct rdev_sysfs_entry { |
2509 | struct attribute attr; | |
3cb03002 N |
2510 | ssize_t (*show)(struct md_rdev *, char *); |
2511 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2512 | }; |
2513 | ||
2514 | static ssize_t | |
3cb03002 | 2515 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2516 | { |
2517 | char *sep = ""; | |
20a49ff6 | 2518 | size_t len = 0; |
758bfc8a | 2519 | unsigned long flags = ACCESS_ONCE(rdev->flags); |
86e6ffdd | 2520 | |
758bfc8a | 2521 | if (test_bit(Faulty, &flags) || |
de393cde | 2522 | rdev->badblocks.unacked_exist) { |
86e6ffdd N |
2523 | len+= sprintf(page+len, "%sfaulty",sep); |
2524 | sep = ","; | |
2525 | } | |
758bfc8a | 2526 | if (test_bit(In_sync, &flags)) { |
86e6ffdd N |
2527 | len += sprintf(page+len, "%sin_sync",sep); |
2528 | sep = ","; | |
2529 | } | |
ac6096e9 SL |
2530 | if (test_bit(Journal, &flags)) { |
2531 | len += sprintf(page+len, "%sjournal",sep); | |
2532 | sep = ","; | |
2533 | } | |
758bfc8a | 2534 | if (test_bit(WriteMostly, &flags)) { |
f655675b N |
2535 | len += sprintf(page+len, "%swrite_mostly",sep); |
2536 | sep = ","; | |
2537 | } | |
758bfc8a | 2538 | if (test_bit(Blocked, &flags) || |
52c64152 | 2539 | (rdev->badblocks.unacked_exist |
758bfc8a | 2540 | && !test_bit(Faulty, &flags))) { |
6bfe0b49 DW |
2541 | len += sprintf(page+len, "%sblocked", sep); |
2542 | sep = ","; | |
2543 | } | |
758bfc8a | 2544 | if (!test_bit(Faulty, &flags) && |
f2076e7d | 2545 | !test_bit(Journal, &flags) && |
758bfc8a | 2546 | !test_bit(In_sync, &flags)) { |
86e6ffdd N |
2547 | len += sprintf(page+len, "%sspare", sep); |
2548 | sep = ","; | |
2549 | } | |
758bfc8a | 2550 | if (test_bit(WriteErrorSeen, &flags)) { |
d7a9d443 N |
2551 | len += sprintf(page+len, "%swrite_error", sep); |
2552 | sep = ","; | |
2553 | } | |
758bfc8a | 2554 | if (test_bit(WantReplacement, &flags)) { |
2d78f8c4 N |
2555 | len += sprintf(page+len, "%swant_replacement", sep); |
2556 | sep = ","; | |
2557 | } | |
758bfc8a | 2558 | if (test_bit(Replacement, &flags)) { |
2d78f8c4 N |
2559 | len += sprintf(page+len, "%sreplacement", sep); |
2560 | sep = ","; | |
2561 | } | |
2562 | ||
86e6ffdd N |
2563 | return len+sprintf(page+len, "\n"); |
2564 | } | |
2565 | ||
45dc2de1 | 2566 | static ssize_t |
3cb03002 | 2567 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2568 | { |
2569 | /* can write | |
de393cde | 2570 | * faulty - simulates an error |
45dc2de1 | 2571 | * remove - disconnects the device |
f655675b N |
2572 | * writemostly - sets write_mostly |
2573 | * -writemostly - clears write_mostly | |
de393cde N |
2574 | * blocked - sets the Blocked flags |
2575 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2576 | * insync - sets Insync providing device isn't active |
f466722c N |
2577 | * -insync - clear Insync for a device with a slot assigned, |
2578 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2579 | * write_error - sets WriteErrorSeen |
2580 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2581 | */ |
2582 | int err = -EINVAL; | |
2583 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2584 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2585 | if (test_bit(Faulty, &rdev->flags)) |
2586 | err = 0; | |
2587 | else | |
2588 | err = -EBUSY; | |
45dc2de1 N |
2589 | } else if (cmd_match(buf, "remove")) { |
2590 | if (rdev->raid_disk >= 0) | |
2591 | err = -EBUSY; | |
2592 | else { | |
fd01b88c | 2593 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2594 | err = 0; |
a9720903 GJ |
2595 | if (mddev_is_clustered(mddev)) |
2596 | err = md_cluster_ops->remove_disk(mddev, rdev); | |
2597 | ||
2598 | if (err == 0) { | |
2599 | md_kick_rdev_from_array(rdev); | |
2600 | if (mddev->pers) | |
2601 | md_update_sb(mddev, 1); | |
2602 | md_new_event(mddev); | |
2603 | } | |
45dc2de1 | 2604 | } |
f655675b N |
2605 | } else if (cmd_match(buf, "writemostly")) { |
2606 | set_bit(WriteMostly, &rdev->flags); | |
2607 | err = 0; | |
2608 | } else if (cmd_match(buf, "-writemostly")) { | |
2609 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2610 | err = 0; |
2611 | } else if (cmd_match(buf, "blocked")) { | |
2612 | set_bit(Blocked, &rdev->flags); | |
2613 | err = 0; | |
2614 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2615 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2616 | rdev->badblocks.unacked_exist) { |
de393cde N |
2617 | /* metadata handler doesn't understand badblocks, |
2618 | * so we need to fail the device | |
2619 | */ | |
2620 | md_error(rdev->mddev, rdev); | |
2621 | } | |
6bfe0b49 | 2622 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2623 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2624 | wake_up(&rdev->blocked_wait); |
2625 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2626 | md_wakeup_thread(rdev->mddev->thread); | |
2627 | ||
6d56e278 N |
2628 | err = 0; |
2629 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2630 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2631 | err = 0; |
f2076e7d SL |
2632 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 && |
2633 | !test_bit(Journal, &rdev->flags)) { | |
e1960f8c N |
2634 | if (rdev->mddev->pers == NULL) { |
2635 | clear_bit(In_sync, &rdev->flags); | |
2636 | rdev->saved_raid_disk = rdev->raid_disk; | |
2637 | rdev->raid_disk = -1; | |
2638 | err = 0; | |
2639 | } | |
d7a9d443 N |
2640 | } else if (cmd_match(buf, "write_error")) { |
2641 | set_bit(WriteErrorSeen, &rdev->flags); | |
2642 | err = 0; | |
2643 | } else if (cmd_match(buf, "-write_error")) { | |
2644 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2645 | err = 0; | |
2d78f8c4 N |
2646 | } else if (cmd_match(buf, "want_replacement")) { |
2647 | /* Any non-spare device that is not a replacement can | |
2648 | * become want_replacement at any time, but we then need to | |
2649 | * check if recovery is needed. | |
2650 | */ | |
2651 | if (rdev->raid_disk >= 0 && | |
f2076e7d | 2652 | !test_bit(Journal, &rdev->flags) && |
2d78f8c4 N |
2653 | !test_bit(Replacement, &rdev->flags)) |
2654 | set_bit(WantReplacement, &rdev->flags); | |
2655 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2656 | md_wakeup_thread(rdev->mddev->thread); | |
2657 | err = 0; | |
2658 | } else if (cmd_match(buf, "-want_replacement")) { | |
2659 | /* Clearing 'want_replacement' is always allowed. | |
2660 | * Once replacements starts it is too late though. | |
2661 | */ | |
2662 | err = 0; | |
2663 | clear_bit(WantReplacement, &rdev->flags); | |
2664 | } else if (cmd_match(buf, "replacement")) { | |
2665 | /* Can only set a device as a replacement when array has not | |
2666 | * yet been started. Once running, replacement is automatic | |
2667 | * from spares, or by assigning 'slot'. | |
2668 | */ | |
2669 | if (rdev->mddev->pers) | |
2670 | err = -EBUSY; | |
2671 | else { | |
2672 | set_bit(Replacement, &rdev->flags); | |
2673 | err = 0; | |
2674 | } | |
2675 | } else if (cmd_match(buf, "-replacement")) { | |
2676 | /* Similarly, can only clear Replacement before start */ | |
2677 | if (rdev->mddev->pers) | |
2678 | err = -EBUSY; | |
2679 | else { | |
2680 | clear_bit(Replacement, &rdev->flags); | |
2681 | err = 0; | |
2682 | } | |
a6da4ef8 GR |
2683 | } else if (cmd_match(buf, "re-add")) { |
2684 | if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) { | |
97f6cd39 GR |
2685 | /* clear_bit is performed _after_ all the devices |
2686 | * have their local Faulty bit cleared. If any writes | |
2687 | * happen in the meantime in the local node, they | |
2688 | * will land in the local bitmap, which will be synced | |
2689 | * by this node eventually | |
2690 | */ | |
2691 | if (!mddev_is_clustered(rdev->mddev) || | |
2692 | (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { | |
2693 | clear_bit(Faulty, &rdev->flags); | |
2694 | err = add_bound_rdev(rdev); | |
2695 | } | |
a6da4ef8 GR |
2696 | } else |
2697 | err = -EBUSY; | |
45dc2de1 | 2698 | } |
00bcb4ac N |
2699 | if (!err) |
2700 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2701 | return err ? err : len; |
2702 | } | |
80ca3a44 | 2703 | static struct rdev_sysfs_entry rdev_state = |
750f199e | 2704 | __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); |
86e6ffdd | 2705 | |
4dbcdc75 | 2706 | static ssize_t |
3cb03002 | 2707 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2708 | { |
2709 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2710 | } | |
2711 | ||
2712 | static ssize_t | |
3cb03002 | 2713 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 | 2714 | { |
4c9309c0 AD |
2715 | unsigned int n; |
2716 | int rv; | |
2717 | ||
2718 | rv = kstrtouint(buf, 10, &n); | |
2719 | if (rv < 0) | |
2720 | return rv; | |
2721 | atomic_set(&rdev->corrected_errors, n); | |
2722 | return len; | |
4dbcdc75 N |
2723 | } |
2724 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2725 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2726 | |
014236d2 | 2727 | static ssize_t |
3cb03002 | 2728 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 | 2729 | { |
f2076e7d SL |
2730 | if (test_bit(Journal, &rdev->flags)) |
2731 | return sprintf(page, "journal\n"); | |
2732 | else if (rdev->raid_disk < 0) | |
014236d2 N |
2733 | return sprintf(page, "none\n"); |
2734 | else | |
2735 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2736 | } | |
2737 | ||
2738 | static ssize_t | |
3cb03002 | 2739 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 | 2740 | { |
4c9309c0 | 2741 | int slot; |
c303da6d | 2742 | int err; |
4c9309c0 | 2743 | |
f2076e7d SL |
2744 | if (test_bit(Journal, &rdev->flags)) |
2745 | return -EBUSY; | |
014236d2 N |
2746 | if (strncmp(buf, "none", 4)==0) |
2747 | slot = -1; | |
4c9309c0 AD |
2748 | else { |
2749 | err = kstrtouint(buf, 10, (unsigned int *)&slot); | |
2750 | if (err < 0) | |
2751 | return err; | |
2752 | } | |
6c2fce2e | 2753 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2754 | /* Setting 'slot' on an active array requires also |
2755 | * updating the 'rd%d' link, and communicating | |
2756 | * with the personality with ->hot_*_disk. | |
2757 | * For now we only support removing | |
2758 | * failed/spare devices. This normally happens automatically, | |
2759 | * but not when the metadata is externally managed. | |
2760 | */ | |
c303da6d N |
2761 | if (rdev->raid_disk == -1) |
2762 | return -EEXIST; | |
2763 | /* personality does all needed checks */ | |
01393f3d | 2764 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2765 | return -EINVAL; |
746d3207 N |
2766 | clear_bit(Blocked, &rdev->flags); |
2767 | remove_and_add_spares(rdev->mddev, rdev); | |
2768 | if (rdev->raid_disk >= 0) | |
2769 | return -EBUSY; | |
c303da6d N |
2770 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2771 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2772 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2773 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2774 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2775 | */ |
2776 | ||
2777 | if (rdev->raid_disk != -1) | |
2778 | return -EBUSY; | |
2779 | ||
c6751b2b N |
2780 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2781 | return -EBUSY; | |
2782 | ||
6c2fce2e NB |
2783 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2784 | return -EINVAL; | |
2785 | ||
ba1b41b6 N |
2786 | if (slot >= rdev->mddev->raid_disks && |
2787 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2788 | return -ENOSPC; | |
2789 | ||
6c2fce2e NB |
2790 | rdev->raid_disk = slot; |
2791 | if (test_bit(In_sync, &rdev->flags)) | |
2792 | rdev->saved_raid_disk = slot; | |
2793 | else | |
2794 | rdev->saved_raid_disk = -1; | |
d30519fc | 2795 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2796 | clear_bit(Bitmap_sync, &rdev->flags); |
2910ff17 GR |
2797 | remove_and_add_spares(rdev->mddev, rdev); |
2798 | if (rdev->raid_disk == -1) | |
2799 | return -EBUSY; | |
6c2fce2e | 2800 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2801 | } else { |
ba1b41b6 N |
2802 | if (slot >= rdev->mddev->raid_disks && |
2803 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2804 | return -ENOSPC; |
2805 | rdev->raid_disk = slot; | |
2806 | /* assume it is working */ | |
c5d79adb N |
2807 | clear_bit(Faulty, &rdev->flags); |
2808 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2809 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2810 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2811 | } |
014236d2 N |
2812 | return len; |
2813 | } | |
2814 | ||
014236d2 | 2815 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2816 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2817 | |
93c8cad0 | 2818 | static ssize_t |
3cb03002 | 2819 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2820 | { |
6961ece4 | 2821 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2822 | } |
2823 | ||
2824 | static ssize_t | |
3cb03002 | 2825 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2826 | { |
c6563a8c | 2827 | unsigned long long offset; |
b29bebd6 | 2828 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 2829 | return -EINVAL; |
8ed0a521 | 2830 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2831 | return -EBUSY; |
dd8ac336 | 2832 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2833 | /* Must set offset before size, so overlap checks |
2834 | * can be sane */ | |
2835 | return -EBUSY; | |
93c8cad0 | 2836 | rdev->data_offset = offset; |
25f7fd47 | 2837 | rdev->new_data_offset = offset; |
93c8cad0 N |
2838 | return len; |
2839 | } | |
2840 | ||
2841 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2842 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2843 | |
c6563a8c N |
2844 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2845 | { | |
2846 | return sprintf(page, "%llu\n", | |
2847 | (unsigned long long)rdev->new_data_offset); | |
2848 | } | |
2849 | ||
2850 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2851 | const char *buf, size_t len) | |
2852 | { | |
2853 | unsigned long long new_offset; | |
2854 | struct mddev *mddev = rdev->mddev; | |
2855 | ||
b29bebd6 | 2856 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
2857 | return -EINVAL; |
2858 | ||
f851b60d N |
2859 | if (mddev->sync_thread || |
2860 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
2861 | return -EBUSY; |
2862 | if (new_offset == rdev->data_offset) | |
2863 | /* reset is always permitted */ | |
2864 | ; | |
2865 | else if (new_offset > rdev->data_offset) { | |
2866 | /* must not push array size beyond rdev_sectors */ | |
2867 | if (new_offset - rdev->data_offset | |
2868 | + mddev->dev_sectors > rdev->sectors) | |
2869 | return -E2BIG; | |
2870 | } | |
2871 | /* Metadata worries about other space details. */ | |
2872 | ||
2873 | /* decreasing the offset is inconsistent with a backwards | |
2874 | * reshape. | |
2875 | */ | |
2876 | if (new_offset < rdev->data_offset && | |
2877 | mddev->reshape_backwards) | |
2878 | return -EINVAL; | |
2879 | /* Increasing offset is inconsistent with forwards | |
2880 | * reshape. reshape_direction should be set to | |
2881 | * 'backwards' first. | |
2882 | */ | |
2883 | if (new_offset > rdev->data_offset && | |
2884 | !mddev->reshape_backwards) | |
2885 | return -EINVAL; | |
2886 | ||
2887 | if (mddev->pers && mddev->persistent && | |
2888 | !super_types[mddev->major_version] | |
2889 | .allow_new_offset(rdev, new_offset)) | |
2890 | return -E2BIG; | |
2891 | rdev->new_data_offset = new_offset; | |
2892 | if (new_offset > rdev->data_offset) | |
2893 | mddev->reshape_backwards = 1; | |
2894 | else if (new_offset < rdev->data_offset) | |
2895 | mddev->reshape_backwards = 0; | |
2896 | ||
2897 | return len; | |
2898 | } | |
2899 | static struct rdev_sysfs_entry rdev_new_offset = | |
2900 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2901 | ||
83303b61 | 2902 | static ssize_t |
3cb03002 | 2903 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2904 | { |
dd8ac336 | 2905 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2906 | } |
2907 | ||
c5d79adb N |
2908 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2909 | { | |
2910 | /* check if two start/length pairs overlap */ | |
2911 | if (s1+l1 <= s2) | |
2912 | return 0; | |
2913 | if (s2+l2 <= s1) | |
2914 | return 0; | |
2915 | return 1; | |
2916 | } | |
2917 | ||
b522adcd DW |
2918 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2919 | { | |
2920 | unsigned long long blocks; | |
2921 | sector_t new; | |
2922 | ||
b29bebd6 | 2923 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
2924 | return -EINVAL; |
2925 | ||
2926 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2927 | return -EINVAL; /* sector conversion overflow */ | |
2928 | ||
2929 | new = blocks * 2; | |
2930 | if (new != blocks * 2) | |
2931 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2932 | ||
2933 | *sectors = new; | |
2934 | return 0; | |
2935 | } | |
2936 | ||
83303b61 | 2937 | static ssize_t |
3cb03002 | 2938 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2939 | { |
fd01b88c | 2940 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2941 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2942 | sector_t sectors; |
27c529bb | 2943 | |
f2076e7d SL |
2944 | if (test_bit(Journal, &rdev->flags)) |
2945 | return -EBUSY; | |
b522adcd | 2946 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2947 | return -EINVAL; |
c6563a8c N |
2948 | if (rdev->data_offset != rdev->new_data_offset) |
2949 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2950 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2951 | if (my_mddev->persistent) { |
dd8ac336 AN |
2952 | sectors = super_types[my_mddev->major_version]. |
2953 | rdev_size_change(rdev, sectors); | |
2954 | if (!sectors) | |
0cd17fec | 2955 | return -EBUSY; |
dd8ac336 | 2956 | } else if (!sectors) |
77304d2a | 2957 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2958 | rdev->data_offset; |
a6468539 N |
2959 | if (!my_mddev->pers->resize) |
2960 | /* Cannot change size for RAID0 or Linear etc */ | |
2961 | return -EINVAL; | |
0cd17fec | 2962 | } |
dd8ac336 | 2963 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2964 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2965 | |
dd8ac336 AN |
2966 | rdev->sectors = sectors; |
2967 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
2968 | /* Need to check that all other rdevs with the same |
2969 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
2970 | * the rdev lists safely. | |
2971 | * This check does not provide a hard guarantee, it | |
2972 | * just helps avoid dangerous mistakes. | |
c5d79adb | 2973 | */ |
fd01b88c | 2974 | struct mddev *mddev; |
c5d79adb | 2975 | int overlap = 0; |
159ec1fc | 2976 | struct list_head *tmp; |
c5d79adb | 2977 | |
8b1afc3d | 2978 | rcu_read_lock(); |
29ac4aa3 | 2979 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2980 | struct md_rdev *rdev2; |
c5d79adb | 2981 | |
dafb20fa | 2982 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
2983 | if (rdev->bdev == rdev2->bdev && |
2984 | rdev != rdev2 && | |
2985 | overlaps(rdev->data_offset, rdev->sectors, | |
2986 | rdev2->data_offset, | |
2987 | rdev2->sectors)) { | |
c5d79adb N |
2988 | overlap = 1; |
2989 | break; | |
2990 | } | |
c5d79adb N |
2991 | if (overlap) { |
2992 | mddev_put(mddev); | |
2993 | break; | |
2994 | } | |
2995 | } | |
8b1afc3d | 2996 | rcu_read_unlock(); |
c5d79adb N |
2997 | if (overlap) { |
2998 | /* Someone else could have slipped in a size | |
2999 | * change here, but doing so is just silly. | |
dd8ac336 | 3000 | * We put oldsectors back because we *know* it is |
c5d79adb N |
3001 | * safe, and trust userspace not to race with |
3002 | * itself | |
3003 | */ | |
dd8ac336 | 3004 | rdev->sectors = oldsectors; |
c5d79adb N |
3005 | return -EBUSY; |
3006 | } | |
3007 | } | |
83303b61 N |
3008 | return len; |
3009 | } | |
3010 | ||
3011 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 3012 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 3013 | |
3cb03002 | 3014 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
3015 | { |
3016 | unsigned long long recovery_start = rdev->recovery_offset; | |
3017 | ||
3018 | if (test_bit(In_sync, &rdev->flags) || | |
3019 | recovery_start == MaxSector) | |
3020 | return sprintf(page, "none\n"); | |
3021 | ||
3022 | return sprintf(page, "%llu\n", recovery_start); | |
3023 | } | |
3024 | ||
3cb03002 | 3025 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
3026 | { |
3027 | unsigned long long recovery_start; | |
3028 | ||
3029 | if (cmd_match(buf, "none")) | |
3030 | recovery_start = MaxSector; | |
b29bebd6 | 3031 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
3032 | return -EINVAL; |
3033 | ||
3034 | if (rdev->mddev->pers && | |
3035 | rdev->raid_disk >= 0) | |
3036 | return -EBUSY; | |
3037 | ||
3038 | rdev->recovery_offset = recovery_start; | |
3039 | if (recovery_start == MaxSector) | |
3040 | set_bit(In_sync, &rdev->flags); | |
3041 | else | |
3042 | clear_bit(In_sync, &rdev->flags); | |
3043 | return len; | |
3044 | } | |
3045 | ||
3046 | static struct rdev_sysfs_entry rdev_recovery_start = | |
3047 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
3048 | ||
16c791a5 N |
3049 | static ssize_t |
3050 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
3051 | static ssize_t | |
3052 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
3053 | ||
3cb03002 | 3054 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3055 | { |
3056 | return badblocks_show(&rdev->badblocks, page, 0); | |
3057 | } | |
3cb03002 | 3058 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 3059 | { |
de393cde N |
3060 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
3061 | /* Maybe that ack was all we needed */ | |
3062 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
3063 | wake_up(&rdev->blocked_wait); | |
3064 | return rv; | |
16c791a5 N |
3065 | } |
3066 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
3067 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
3068 | ||
3cb03002 | 3069 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3070 | { |
3071 | return badblocks_show(&rdev->badblocks, page, 1); | |
3072 | } | |
3cb03002 | 3073 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
3074 | { |
3075 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
3076 | } | |
3077 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
3078 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
3079 | ||
86e6ffdd N |
3080 | static struct attribute *rdev_default_attrs[] = { |
3081 | &rdev_state.attr, | |
4dbcdc75 | 3082 | &rdev_errors.attr, |
014236d2 | 3083 | &rdev_slot.attr, |
93c8cad0 | 3084 | &rdev_offset.attr, |
c6563a8c | 3085 | &rdev_new_offset.attr, |
83303b61 | 3086 | &rdev_size.attr, |
06e3c817 | 3087 | &rdev_recovery_start.attr, |
16c791a5 N |
3088 | &rdev_bad_blocks.attr, |
3089 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
3090 | NULL, |
3091 | }; | |
3092 | static ssize_t | |
3093 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3094 | { | |
3095 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3096 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
86e6ffdd N |
3097 | |
3098 | if (!entry->show) | |
3099 | return -EIO; | |
758bfc8a N |
3100 | if (!rdev->mddev) |
3101 | return -EBUSY; | |
3102 | return entry->show(rdev, page); | |
86e6ffdd N |
3103 | } |
3104 | ||
3105 | static ssize_t | |
3106 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
3107 | const char *page, size_t length) | |
3108 | { | |
3109 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3110 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 3111 | ssize_t rv; |
fd01b88c | 3112 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
3113 | |
3114 | if (!entry->store) | |
3115 | return -EIO; | |
67463acb N |
3116 | if (!capable(CAP_SYS_ADMIN)) |
3117 | return -EACCES; | |
27c529bb | 3118 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 3119 | if (!rv) { |
27c529bb N |
3120 | if (rdev->mddev == NULL) |
3121 | rv = -EBUSY; | |
3122 | else | |
3123 | rv = entry->store(rdev, page, length); | |
6a51830e | 3124 | mddev_unlock(mddev); |
ca388059 N |
3125 | } |
3126 | return rv; | |
86e6ffdd N |
3127 | } |
3128 | ||
3129 | static void rdev_free(struct kobject *ko) | |
3130 | { | |
3cb03002 | 3131 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3132 | kfree(rdev); |
3133 | } | |
52cf25d0 | 3134 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3135 | .show = rdev_attr_show, |
3136 | .store = rdev_attr_store, | |
3137 | }; | |
3138 | static struct kobj_type rdev_ktype = { | |
3139 | .release = rdev_free, | |
3140 | .sysfs_ops = &rdev_sysfs_ops, | |
3141 | .default_attrs = rdev_default_attrs, | |
3142 | }; | |
3143 | ||
3cb03002 | 3144 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3145 | { |
3146 | rdev->desc_nr = -1; | |
3147 | rdev->saved_raid_disk = -1; | |
3148 | rdev->raid_disk = -1; | |
3149 | rdev->flags = 0; | |
3150 | rdev->data_offset = 0; | |
c6563a8c | 3151 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3152 | rdev->sb_events = 0; |
3153 | rdev->last_read_error.tv_sec = 0; | |
3154 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3155 | rdev->sb_loaded = 0; |
3156 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3157 | atomic_set(&rdev->nr_pending, 0); |
3158 | atomic_set(&rdev->read_errors, 0); | |
3159 | atomic_set(&rdev->corrected_errors, 0); | |
3160 | ||
3161 | INIT_LIST_HEAD(&rdev->same_set); | |
3162 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3163 | |
3164 | /* Add space to store bad block list. | |
3165 | * This reserves the space even on arrays where it cannot | |
3166 | * be used - I wonder if that matters | |
3167 | */ | |
3168 | rdev->badblocks.count = 0; | |
486adf72 | 3169 | rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
2230dfe4 N |
3170 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3171 | seqlock_init(&rdev->badblocks.lock); | |
3172 | if (rdev->badblocks.page == NULL) | |
3173 | return -ENOMEM; | |
3174 | ||
3175 | return 0; | |
e8bb9a83 N |
3176 | } |
3177 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3178 | /* |
3179 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3180 | * | |
3181 | * mark the device faulty if: | |
3182 | * | |
3183 | * - the device is nonexistent (zero size) | |
3184 | * - the device has no valid superblock | |
3185 | * | |
3186 | * a faulty rdev _never_ has rdev->sb set. | |
3187 | */ | |
3cb03002 | 3188 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3189 | { |
3190 | char b[BDEVNAME_SIZE]; | |
3191 | int err; | |
3cb03002 | 3192 | struct md_rdev *rdev; |
1da177e4 LT |
3193 | sector_t size; |
3194 | ||
9ffae0cf | 3195 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3196 | if (!rdev) { |
3197 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3198 | return ERR_PTR(-ENOMEM); | |
3199 | } | |
1da177e4 | 3200 | |
2230dfe4 N |
3201 | err = md_rdev_init(rdev); |
3202 | if (err) | |
3203 | goto abort_free; | |
3204 | err = alloc_disk_sb(rdev); | |
3205 | if (err) | |
1da177e4 LT |
3206 | goto abort_free; |
3207 | ||
c5d79adb | 3208 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3209 | if (err) |
3210 | goto abort_free; | |
3211 | ||
f9cb074b | 3212 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3213 | |
77304d2a | 3214 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3215 | if (!size) { |
f72ffdd6 | 3216 | printk(KERN_WARNING |
1da177e4 LT |
3217 | "md: %s has zero or unknown size, marking faulty!\n", |
3218 | bdevname(rdev->bdev,b)); | |
3219 | err = -EINVAL; | |
3220 | goto abort_free; | |
3221 | } | |
3222 | ||
3223 | if (super_format >= 0) { | |
3224 | err = super_types[super_format]. | |
3225 | load_super(rdev, NULL, super_minor); | |
3226 | if (err == -EINVAL) { | |
df968c4e N |
3227 | printk(KERN_WARNING |
3228 | "md: %s does not have a valid v%d.%d " | |
3229 | "superblock, not importing!\n", | |
3230 | bdevname(rdev->bdev,b), | |
3231 | super_format, super_minor); | |
1da177e4 LT |
3232 | goto abort_free; |
3233 | } | |
3234 | if (err < 0) { | |
f72ffdd6 | 3235 | printk(KERN_WARNING |
1da177e4 LT |
3236 | "md: could not read %s's sb, not importing!\n", |
3237 | bdevname(rdev->bdev,b)); | |
3238 | goto abort_free; | |
3239 | } | |
3240 | } | |
6bfe0b49 | 3241 | |
1da177e4 LT |
3242 | return rdev; |
3243 | ||
3244 | abort_free: | |
2699b672 N |
3245 | if (rdev->bdev) |
3246 | unlock_rdev(rdev); | |
545c8795 | 3247 | md_rdev_clear(rdev); |
1da177e4 LT |
3248 | kfree(rdev); |
3249 | return ERR_PTR(err); | |
3250 | } | |
3251 | ||
3252 | /* | |
3253 | * Check a full RAID array for plausibility | |
3254 | */ | |
3255 | ||
f72ffdd6 | 3256 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3257 | { |
3258 | int i; | |
3cb03002 | 3259 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3260 | char b[BDEVNAME_SIZE]; |
3261 | ||
3262 | freshest = NULL; | |
dafb20fa | 3263 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3264 | switch (super_types[mddev->major_version]. |
3265 | load_super(rdev, freshest, mddev->minor_version)) { | |
3266 | case 1: | |
3267 | freshest = rdev; | |
3268 | break; | |
3269 | case 0: | |
3270 | break; | |
3271 | default: | |
3272 | printk( KERN_ERR \ | |
3273 | "md: fatal superblock inconsistency in %s" | |
f72ffdd6 | 3274 | " -- removing from array\n", |
1da177e4 | 3275 | bdevname(rdev->bdev,b)); |
fb56dfef | 3276 | md_kick_rdev_from_array(rdev); |
1da177e4 LT |
3277 | } |
3278 | ||
1da177e4 LT |
3279 | super_types[mddev->major_version]. |
3280 | validate_super(mddev, freshest); | |
3281 | ||
3282 | i = 0; | |
dafb20fa | 3283 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3284 | if (mddev->max_disks && |
3285 | (rdev->desc_nr >= mddev->max_disks || | |
3286 | i > mddev->max_disks)) { | |
de01dfad N |
3287 | printk(KERN_WARNING |
3288 | "md: %s: %s: only %d devices permitted\n", | |
3289 | mdname(mddev), bdevname(rdev->bdev, b), | |
3290 | mddev->max_disks); | |
fb56dfef | 3291 | md_kick_rdev_from_array(rdev); |
de01dfad N |
3292 | continue; |
3293 | } | |
1aee41f6 | 3294 | if (rdev != freshest) { |
1da177e4 LT |
3295 | if (super_types[mddev->major_version]. |
3296 | validate_super(mddev, rdev)) { | |
3297 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3298 | " from array!\n", | |
3299 | bdevname(rdev->bdev,b)); | |
fb56dfef | 3300 | md_kick_rdev_from_array(rdev); |
1da177e4 LT |
3301 | continue; |
3302 | } | |
1aee41f6 | 3303 | } |
1da177e4 LT |
3304 | if (mddev->level == LEVEL_MULTIPATH) { |
3305 | rdev->desc_nr = i++; | |
3306 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3307 | set_bit(In_sync, &rdev->flags); |
f2076e7d SL |
3308 | } else if (rdev->raid_disk >= |
3309 | (mddev->raid_disks - min(0, mddev->delta_disks)) && | |
3310 | !test_bit(Journal, &rdev->flags)) { | |
a778b73f N |
3311 | rdev->raid_disk = -1; |
3312 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3313 | } |
3314 | } | |
1da177e4 LT |
3315 | } |
3316 | ||
72e02075 N |
3317 | /* Read a fixed-point number. |
3318 | * Numbers in sysfs attributes should be in "standard" units where | |
3319 | * possible, so time should be in seconds. | |
f72ffdd6 | 3320 | * However we internally use a a much smaller unit such as |
72e02075 N |
3321 | * milliseconds or jiffies. |
3322 | * This function takes a decimal number with a possible fractional | |
3323 | * component, and produces an integer which is the result of | |
3324 | * multiplying that number by 10^'scale'. | |
3325 | * all without any floating-point arithmetic. | |
3326 | */ | |
3327 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3328 | { | |
3329 | unsigned long result = 0; | |
3330 | long decimals = -1; | |
3331 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3332 | if (*cp == '.') | |
3333 | decimals = 0; | |
3334 | else if (decimals < scale) { | |
3335 | unsigned int value; | |
3336 | value = *cp - '0'; | |
3337 | result = result * 10 + value; | |
3338 | if (decimals >= 0) | |
3339 | decimals++; | |
3340 | } | |
3341 | cp++; | |
3342 | } | |
3343 | if (*cp == '\n') | |
3344 | cp++; | |
3345 | if (*cp) | |
3346 | return -EINVAL; | |
3347 | if (decimals < 0) | |
3348 | decimals = 0; | |
3349 | while (decimals < scale) { | |
3350 | result *= 10; | |
3351 | decimals ++; | |
3352 | } | |
3353 | *res = result; | |
3354 | return 0; | |
3355 | } | |
3356 | ||
16f17b39 | 3357 | static ssize_t |
fd01b88c | 3358 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3359 | { |
3360 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3361 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3362 | } | |
3363 | static ssize_t | |
fd01b88c | 3364 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3365 | { |
16f17b39 | 3366 | unsigned long msec; |
97ce0a7f | 3367 | |
28c1b9fd GR |
3368 | if (mddev_is_clustered(mddev)) { |
3369 | pr_info("md: Safemode is disabled for clustered mode\n"); | |
3370 | return -EINVAL; | |
3371 | } | |
3372 | ||
72e02075 | 3373 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3374 | return -EINVAL; |
16f17b39 N |
3375 | if (msec == 0) |
3376 | mddev->safemode_delay = 0; | |
3377 | else { | |
19052c0e | 3378 | unsigned long old_delay = mddev->safemode_delay; |
1b30e66f N |
3379 | unsigned long new_delay = (msec*HZ)/1000; |
3380 | ||
3381 | if (new_delay == 0) | |
3382 | new_delay = 1; | |
3383 | mddev->safemode_delay = new_delay; | |
3384 | if (new_delay < old_delay || old_delay == 0) | |
3385 | mod_timer(&mddev->safemode_timer, jiffies+1); | |
16f17b39 N |
3386 | } |
3387 | return len; | |
3388 | } | |
3389 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3390 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3391 | |
eae1701f | 3392 | static ssize_t |
fd01b88c | 3393 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3394 | { |
36d091f4 N |
3395 | struct md_personality *p; |
3396 | int ret; | |
3397 | spin_lock(&mddev->lock); | |
3398 | p = mddev->pers; | |
d9d166c2 | 3399 | if (p) |
36d091f4 | 3400 | ret = sprintf(page, "%s\n", p->name); |
d9d166c2 | 3401 | else if (mddev->clevel[0]) |
36d091f4 | 3402 | ret = sprintf(page, "%s\n", mddev->clevel); |
d9d166c2 | 3403 | else if (mddev->level != LEVEL_NONE) |
36d091f4 | 3404 | ret = sprintf(page, "%d\n", mddev->level); |
d9d166c2 | 3405 | else |
36d091f4 N |
3406 | ret = 0; |
3407 | spin_unlock(&mddev->lock); | |
3408 | return ret; | |
eae1701f N |
3409 | } |
3410 | ||
d9d166c2 | 3411 | static ssize_t |
fd01b88c | 3412 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3413 | { |
f2859af6 | 3414 | char clevel[16]; |
6791875e N |
3415 | ssize_t rv; |
3416 | size_t slen = len; | |
db721d32 | 3417 | struct md_personality *pers, *oldpers; |
f2859af6 | 3418 | long level; |
db721d32 | 3419 | void *priv, *oldpriv; |
3cb03002 | 3420 | struct md_rdev *rdev; |
245f46c2 | 3421 | |
6791875e N |
3422 | if (slen == 0 || slen >= sizeof(clevel)) |
3423 | return -EINVAL; | |
3424 | ||
3425 | rv = mddev_lock(mddev); | |
3426 | if (rv) | |
3427 | return rv; | |
3428 | ||
245f46c2 | 3429 | if (mddev->pers == NULL) { |
6791875e N |
3430 | strncpy(mddev->clevel, buf, slen); |
3431 | if (mddev->clevel[slen-1] == '\n') | |
3432 | slen--; | |
3433 | mddev->clevel[slen] = 0; | |
245f46c2 | 3434 | mddev->level = LEVEL_NONE; |
6791875e N |
3435 | rv = len; |
3436 | goto out_unlock; | |
245f46c2 | 3437 | } |
6791875e | 3438 | rv = -EROFS; |
bd8839e0 | 3439 | if (mddev->ro) |
6791875e | 3440 | goto out_unlock; |
245f46c2 N |
3441 | |
3442 | /* request to change the personality. Need to ensure: | |
3443 | * - array is not engaged in resync/recovery/reshape | |
3444 | * - old personality can be suspended | |
3445 | * - new personality will access other array. | |
3446 | */ | |
3447 | ||
6791875e | 3448 | rv = -EBUSY; |
bb4f1e9d | 3449 | if (mddev->sync_thread || |
f851b60d | 3450 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3451 | mddev->reshape_position != MaxSector || |
3452 | mddev->sysfs_active) | |
6791875e | 3453 | goto out_unlock; |
245f46c2 | 3454 | |
6791875e | 3455 | rv = -EINVAL; |
245f46c2 N |
3456 | if (!mddev->pers->quiesce) { |
3457 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3458 | mdname(mddev), mddev->pers->name); | |
6791875e | 3459 | goto out_unlock; |
245f46c2 N |
3460 | } |
3461 | ||
3462 | /* Now find the new personality */ | |
6791875e N |
3463 | strncpy(clevel, buf, slen); |
3464 | if (clevel[slen-1] == '\n') | |
3465 | slen--; | |
3466 | clevel[slen] = 0; | |
b29bebd6 | 3467 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3468 | level = LEVEL_NONE; |
245f46c2 | 3469 | |
f2859af6 DW |
3470 | if (request_module("md-%s", clevel) != 0) |
3471 | request_module("md-level-%s", clevel); | |
245f46c2 | 3472 | spin_lock(&pers_lock); |
f2859af6 | 3473 | pers = find_pers(level, clevel); |
245f46c2 N |
3474 | if (!pers || !try_module_get(pers->owner)) { |
3475 | spin_unlock(&pers_lock); | |
f2859af6 | 3476 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
6791875e N |
3477 | rv = -EINVAL; |
3478 | goto out_unlock; | |
245f46c2 N |
3479 | } |
3480 | spin_unlock(&pers_lock); | |
3481 | ||
3482 | if (pers == mddev->pers) { | |
3483 | /* Nothing to do! */ | |
3484 | module_put(pers->owner); | |
6791875e N |
3485 | rv = len; |
3486 | goto out_unlock; | |
245f46c2 N |
3487 | } |
3488 | if (!pers->takeover) { | |
3489 | module_put(pers->owner); | |
3490 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3491 | mdname(mddev), clevel); |
6791875e N |
3492 | rv = -EINVAL; |
3493 | goto out_unlock; | |
245f46c2 N |
3494 | } |
3495 | ||
dafb20fa | 3496 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3497 | rdev->new_raid_disk = rdev->raid_disk; |
3498 | ||
245f46c2 N |
3499 | /* ->takeover must set new_* and/or delta_disks |
3500 | * if it succeeds, and may set them when it fails. | |
3501 | */ | |
3502 | priv = pers->takeover(mddev); | |
3503 | if (IS_ERR(priv)) { | |
3504 | mddev->new_level = mddev->level; | |
3505 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3506 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3507 | mddev->raid_disks -= mddev->delta_disks; |
3508 | mddev->delta_disks = 0; | |
2c810cdd | 3509 | mddev->reshape_backwards = 0; |
245f46c2 N |
3510 | module_put(pers->owner); |
3511 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3512 | mdname(mddev), clevel); |
6791875e N |
3513 | rv = PTR_ERR(priv); |
3514 | goto out_unlock; | |
245f46c2 N |
3515 | } |
3516 | ||
3517 | /* Looks like we have a winner */ | |
3518 | mddev_suspend(mddev); | |
5aa61f42 | 3519 | mddev_detach(mddev); |
36d091f4 N |
3520 | |
3521 | spin_lock(&mddev->lock); | |
db721d32 N |
3522 | oldpers = mddev->pers; |
3523 | oldpriv = mddev->private; | |
3524 | mddev->pers = pers; | |
3525 | mddev->private = priv; | |
3526 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3527 | mddev->level = mddev->new_level; | |
3528 | mddev->layout = mddev->new_layout; | |
3529 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
3530 | mddev->delta_disks = 0; | |
3531 | mddev->reshape_backwards = 0; | |
3532 | mddev->degraded = 0; | |
36d091f4 | 3533 | spin_unlock(&mddev->lock); |
db721d32 N |
3534 | |
3535 | if (oldpers->sync_request == NULL && | |
3536 | mddev->external) { | |
3537 | /* We are converting from a no-redundancy array | |
3538 | * to a redundancy array and metadata is managed | |
3539 | * externally so we need to be sure that writes | |
3540 | * won't block due to a need to transition | |
3541 | * clean->dirty | |
3542 | * until external management is started. | |
3543 | */ | |
3544 | mddev->in_sync = 0; | |
3545 | mddev->safemode_delay = 0; | |
3546 | mddev->safemode = 0; | |
3547 | } | |
f72ffdd6 | 3548 | |
db721d32 N |
3549 | oldpers->free(mddev, oldpriv); |
3550 | ||
3551 | if (oldpers->sync_request == NULL && | |
a64c876f N |
3552 | pers->sync_request != NULL) { |
3553 | /* need to add the md_redundancy_group */ | |
3554 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3555 | printk(KERN_WARNING | |
3556 | "md: cannot register extra attributes for %s\n", | |
3557 | mdname(mddev)); | |
388975cc | 3558 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3559 | } |
db721d32 | 3560 | if (oldpers->sync_request != NULL && |
a64c876f N |
3561 | pers->sync_request == NULL) { |
3562 | /* need to remove the md_redundancy_group */ | |
3563 | if (mddev->to_remove == NULL) | |
3564 | mddev->to_remove = &md_redundancy_group; | |
3565 | } | |
3566 | ||
dafb20fa | 3567 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3568 | if (rdev->raid_disk < 0) |
3569 | continue; | |
bf2cb0da | 3570 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3571 | rdev->new_raid_disk = -1; |
3572 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3573 | continue; | |
36fad858 | 3574 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3575 | } |
dafb20fa | 3576 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3577 | if (rdev->raid_disk < 0) |
3578 | continue; | |
3579 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3580 | continue; | |
3581 | rdev->raid_disk = rdev->new_raid_disk; | |
3582 | if (rdev->raid_disk < 0) | |
3a981b03 | 3583 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3584 | else { |
36fad858 NK |
3585 | if (sysfs_link_rdev(mddev, rdev)) |
3586 | printk(KERN_WARNING "md: cannot register rd%d" | |
3587 | " for %s after level change\n", | |
3588 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3589 | } |
e93f68a1 N |
3590 | } |
3591 | ||
db721d32 | 3592 | if (pers->sync_request == NULL) { |
9af204cf TM |
3593 | /* this is now an array without redundancy, so |
3594 | * it must always be in_sync | |
3595 | */ | |
3596 | mddev->in_sync = 1; | |
3597 | del_timer_sync(&mddev->safemode_timer); | |
3598 | } | |
02e5f5c0 | 3599 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3600 | pers->run(mddev); |
245f46c2 | 3601 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3602 | mddev_resume(mddev); |
830778a1 N |
3603 | if (!mddev->thread) |
3604 | md_update_sb(mddev, 1); | |
5cac7861 | 3605 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3606 | md_new_event(mddev); |
6791875e N |
3607 | rv = len; |
3608 | out_unlock: | |
3609 | mddev_unlock(mddev); | |
d9d166c2 N |
3610 | return rv; |
3611 | } | |
3612 | ||
3613 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3614 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3615 | |
d4dbd025 | 3616 | static ssize_t |
fd01b88c | 3617 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3618 | { |
3619 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3620 | if (mddev->reshape_position != MaxSector && |
3621 | mddev->layout != mddev->new_layout) | |
3622 | return sprintf(page, "%d (%d)\n", | |
3623 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3624 | return sprintf(page, "%d\n", mddev->layout); |
3625 | } | |
3626 | ||
3627 | static ssize_t | |
fd01b88c | 3628 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 | 3629 | { |
4c9309c0 | 3630 | unsigned int n; |
6791875e | 3631 | int err; |
d4dbd025 | 3632 | |
4c9309c0 AD |
3633 | err = kstrtouint(buf, 10, &n); |
3634 | if (err < 0) | |
3635 | return err; | |
6791875e N |
3636 | err = mddev_lock(mddev); |
3637 | if (err) | |
3638 | return err; | |
d4dbd025 | 3639 | |
b3546035 | 3640 | if (mddev->pers) { |
50ac168a | 3641 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3642 | err = -EBUSY; |
3643 | else if (mddev->ro) | |
3644 | err = -EROFS; | |
3645 | else { | |
3646 | mddev->new_layout = n; | |
3647 | err = mddev->pers->check_reshape(mddev); | |
3648 | if (err) | |
3649 | mddev->new_layout = mddev->layout; | |
597a711b | 3650 | } |
b3546035 | 3651 | } else { |
08a02ecd | 3652 | mddev->new_layout = n; |
b3546035 N |
3653 | if (mddev->reshape_position == MaxSector) |
3654 | mddev->layout = n; | |
3655 | } | |
6791875e N |
3656 | mddev_unlock(mddev); |
3657 | return err ?: len; | |
d4dbd025 N |
3658 | } |
3659 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3660 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3661 | |
eae1701f | 3662 | static ssize_t |
fd01b88c | 3663 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3664 | { |
bb636547 N |
3665 | if (mddev->raid_disks == 0) |
3666 | return 0; | |
08a02ecd N |
3667 | if (mddev->reshape_position != MaxSector && |
3668 | mddev->delta_disks != 0) | |
3669 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3670 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3671 | return sprintf(page, "%d\n", mddev->raid_disks); |
3672 | } | |
3673 | ||
fd01b88c | 3674 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3675 | |
3676 | static ssize_t | |
fd01b88c | 3677 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3678 | { |
4c9309c0 | 3679 | unsigned int n; |
6791875e | 3680 | int err; |
da943b99 | 3681 | |
4c9309c0 AD |
3682 | err = kstrtouint(buf, 10, &n); |
3683 | if (err < 0) | |
3684 | return err; | |
da943b99 | 3685 | |
6791875e N |
3686 | err = mddev_lock(mddev); |
3687 | if (err) | |
3688 | return err; | |
da943b99 | 3689 | if (mddev->pers) |
6791875e | 3690 | err = update_raid_disks(mddev, n); |
08a02ecd | 3691 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3692 | struct md_rdev *rdev; |
08a02ecd | 3693 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c | 3694 | |
6791875e | 3695 | err = -EINVAL; |
c6563a8c N |
3696 | rdev_for_each(rdev, mddev) { |
3697 | if (olddisks < n && | |
3698 | rdev->data_offset < rdev->new_data_offset) | |
6791875e | 3699 | goto out_unlock; |
c6563a8c N |
3700 | if (olddisks > n && |
3701 | rdev->data_offset > rdev->new_data_offset) | |
6791875e | 3702 | goto out_unlock; |
c6563a8c | 3703 | } |
6791875e | 3704 | err = 0; |
08a02ecd N |
3705 | mddev->delta_disks = n - olddisks; |
3706 | mddev->raid_disks = n; | |
2c810cdd | 3707 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3708 | } else |
da943b99 | 3709 | mddev->raid_disks = n; |
6791875e N |
3710 | out_unlock: |
3711 | mddev_unlock(mddev); | |
3712 | return err ? err : len; | |
da943b99 N |
3713 | } |
3714 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3715 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3716 | |
3b34380a | 3717 | static ssize_t |
fd01b88c | 3718 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3719 | { |
08a02ecd | 3720 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3721 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3722 | return sprintf(page, "%d (%d)\n", | |
3723 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3724 | mddev->chunk_sectors << 9); |
3725 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3726 | } |
3727 | ||
3728 | static ssize_t | |
fd01b88c | 3729 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3730 | { |
4c9309c0 | 3731 | unsigned long n; |
6791875e | 3732 | int err; |
3b34380a | 3733 | |
4c9309c0 AD |
3734 | err = kstrtoul(buf, 10, &n); |
3735 | if (err < 0) | |
3736 | return err; | |
3b34380a | 3737 | |
6791875e N |
3738 | err = mddev_lock(mddev); |
3739 | if (err) | |
3740 | return err; | |
b3546035 | 3741 | if (mddev->pers) { |
50ac168a | 3742 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3743 | err = -EBUSY; |
3744 | else if (mddev->ro) | |
3745 | err = -EROFS; | |
3746 | else { | |
3747 | mddev->new_chunk_sectors = n >> 9; | |
3748 | err = mddev->pers->check_reshape(mddev); | |
3749 | if (err) | |
3750 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
597a711b | 3751 | } |
b3546035 | 3752 | } else { |
664e7c41 | 3753 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3754 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3755 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3756 | } |
6791875e N |
3757 | mddev_unlock(mddev); |
3758 | return err ?: len; | |
3b34380a N |
3759 | } |
3760 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3761 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3762 | |
a94213b1 | 3763 | static ssize_t |
fd01b88c | 3764 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3765 | { |
d1a7c503 N |
3766 | if (mddev->recovery_cp == MaxSector) |
3767 | return sprintf(page, "none\n"); | |
a94213b1 N |
3768 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3769 | } | |
3770 | ||
3771 | static ssize_t | |
fd01b88c | 3772 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3773 | { |
4c9309c0 | 3774 | unsigned long long n; |
6791875e | 3775 | int err; |
4c9309c0 AD |
3776 | |
3777 | if (cmd_match(buf, "none")) | |
3778 | n = MaxSector; | |
3779 | else { | |
3780 | err = kstrtoull(buf, 10, &n); | |
3781 | if (err < 0) | |
3782 | return err; | |
3783 | if (n != (sector_t)n) | |
3784 | return -EINVAL; | |
3785 | } | |
a94213b1 | 3786 | |
6791875e N |
3787 | err = mddev_lock(mddev); |
3788 | if (err) | |
3789 | return err; | |
b098636c | 3790 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6791875e | 3791 | err = -EBUSY; |
a94213b1 | 3792 | |
6791875e N |
3793 | if (!err) { |
3794 | mddev->recovery_cp = n; | |
3795 | if (mddev->pers) | |
3796 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3797 | } | |
3798 | mddev_unlock(mddev); | |
3799 | return err ?: len; | |
a94213b1 N |
3800 | } |
3801 | static struct md_sysfs_entry md_resync_start = | |
750f199e N |
3802 | __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, |
3803 | resync_start_show, resync_start_store); | |
a94213b1 | 3804 | |
9e653b63 N |
3805 | /* |
3806 | * The array state can be: | |
3807 | * | |
3808 | * clear | |
3809 | * No devices, no size, no level | |
3810 | * Equivalent to STOP_ARRAY ioctl | |
3811 | * inactive | |
3812 | * May have some settings, but array is not active | |
3813 | * all IO results in error | |
3814 | * When written, doesn't tear down array, but just stops it | |
3815 | * suspended (not supported yet) | |
3816 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3817 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3818 | * readonly |
3819 | * no resync can happen. no superblocks get written. | |
3820 | * write requests fail | |
3821 | * read-auto | |
3822 | * like readonly, but behaves like 'clean' on a write request. | |
3823 | * | |
3824 | * clean - no pending writes, but otherwise active. | |
3825 | * When written to inactive array, starts without resync | |
3826 | * If a write request arrives then | |
3827 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3828 | * if not known, block and switch to write-pending | |
3829 | * If written to an active array that has pending writes, then fails. | |
3830 | * active | |
3831 | * fully active: IO and resync can be happening. | |
3832 | * When written to inactive array, starts with resync | |
3833 | * | |
3834 | * write-pending | |
3835 | * clean, but writes are blocked waiting for 'active' to be written. | |
3836 | * | |
3837 | * active-idle | |
3838 | * like active, but no writes have been seen for a while (100msec). | |
3839 | * | |
3840 | */ | |
3841 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3842 | write_pending, active_idle, bad_word}; | |
05381954 | 3843 | static char *array_states[] = { |
9e653b63 N |
3844 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3845 | "write-pending", "active-idle", NULL }; | |
3846 | ||
3847 | static int match_word(const char *word, char **list) | |
3848 | { | |
3849 | int n; | |
3850 | for (n=0; list[n]; n++) | |
3851 | if (cmd_match(word, list[n])) | |
3852 | break; | |
3853 | return n; | |
3854 | } | |
3855 | ||
3856 | static ssize_t | |
fd01b88c | 3857 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3858 | { |
3859 | enum array_state st = inactive; | |
3860 | ||
3861 | if (mddev->pers) | |
3862 | switch(mddev->ro) { | |
3863 | case 1: | |
3864 | st = readonly; | |
3865 | break; | |
3866 | case 2: | |
3867 | st = read_auto; | |
3868 | break; | |
3869 | case 0: | |
3870 | if (mddev->in_sync) | |
3871 | st = clean; | |
070dc6dd | 3872 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3873 | st = write_pending; |
9e653b63 N |
3874 | else if (mddev->safemode) |
3875 | st = active_idle; | |
3876 | else | |
3877 | st = active; | |
3878 | } | |
3879 | else { | |
3880 | if (list_empty(&mddev->disks) && | |
3881 | mddev->raid_disks == 0 && | |
58c0fed4 | 3882 | mddev->dev_sectors == 0) |
9e653b63 N |
3883 | st = clear; |
3884 | else | |
3885 | st = inactive; | |
3886 | } | |
3887 | return sprintf(page, "%s\n", array_states[st]); | |
3888 | } | |
3889 | ||
f72ffdd6 N |
3890 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
3891 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
3892 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 3893 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
3894 | |
3895 | static ssize_t | |
fd01b88c | 3896 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 | 3897 | { |
6791875e | 3898 | int err; |
9e653b63 | 3899 | enum array_state st = match_word(buf, array_states); |
6791875e N |
3900 | |
3901 | if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { | |
3902 | /* don't take reconfig_mutex when toggling between | |
3903 | * clean and active | |
3904 | */ | |
3905 | spin_lock(&mddev->lock); | |
3906 | if (st == active) { | |
3907 | restart_array(mddev); | |
3908 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3909 | wake_up(&mddev->sb_wait); | |
3910 | err = 0; | |
3911 | } else /* st == clean */ { | |
3912 | restart_array(mddev); | |
3913 | if (atomic_read(&mddev->writes_pending) == 0) { | |
3914 | if (mddev->in_sync == 0) { | |
3915 | mddev->in_sync = 1; | |
3916 | if (mddev->safemode == 1) | |
3917 | mddev->safemode = 0; | |
3918 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3919 | } | |
3920 | err = 0; | |
3921 | } else | |
3922 | err = -EBUSY; | |
3923 | } | |
3924 | spin_unlock(&mddev->lock); | |
c008f1d3 | 3925 | return err ?: len; |
6791875e N |
3926 | } |
3927 | err = mddev_lock(mddev); | |
3928 | if (err) | |
3929 | return err; | |
3930 | err = -EINVAL; | |
9e653b63 N |
3931 | switch(st) { |
3932 | case bad_word: | |
3933 | break; | |
3934 | case clear: | |
3935 | /* stopping an active array */ | |
a05b7ea0 | 3936 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3937 | break; |
3938 | case inactive: | |
3939 | /* stopping an active array */ | |
90cf195d | 3940 | if (mddev->pers) |
a05b7ea0 | 3941 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3942 | else |
e691063a | 3943 | err = 0; /* already inactive */ |
9e653b63 N |
3944 | break; |
3945 | case suspended: | |
3946 | break; /* not supported yet */ | |
3947 | case readonly: | |
3948 | if (mddev->pers) | |
a05b7ea0 | 3949 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3950 | else { |
3951 | mddev->ro = 1; | |
648b629e | 3952 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3953 | err = do_md_run(mddev); |
3954 | } | |
3955 | break; | |
3956 | case read_auto: | |
9e653b63 | 3957 | if (mddev->pers) { |
80268ee9 | 3958 | if (mddev->ro == 0) |
a05b7ea0 | 3959 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3960 | else if (mddev->ro == 1) |
648b629e N |
3961 | err = restart_array(mddev); |
3962 | if (err == 0) { | |
3963 | mddev->ro = 2; | |
3964 | set_disk_ro(mddev->gendisk, 0); | |
3965 | } | |
9e653b63 N |
3966 | } else { |
3967 | mddev->ro = 2; | |
3968 | err = do_md_run(mddev); | |
3969 | } | |
3970 | break; | |
3971 | case clean: | |
3972 | if (mddev->pers) { | |
339421de SL |
3973 | err = restart_array(mddev); |
3974 | if (err) | |
3975 | break; | |
85572d7c | 3976 | spin_lock(&mddev->lock); |
9e653b63 | 3977 | if (atomic_read(&mddev->writes_pending) == 0) { |
e691063a N |
3978 | if (mddev->in_sync == 0) { |
3979 | mddev->in_sync = 1; | |
31a59e34 N |
3980 | if (mddev->safemode == 1) |
3981 | mddev->safemode = 0; | |
070dc6dd | 3982 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3983 | } |
3984 | err = 0; | |
3985 | } else | |
3986 | err = -EBUSY; | |
85572d7c | 3987 | spin_unlock(&mddev->lock); |
5bf29597 N |
3988 | } else |
3989 | err = -EINVAL; | |
9e653b63 N |
3990 | break; |
3991 | case active: | |
3992 | if (mddev->pers) { | |
339421de SL |
3993 | err = restart_array(mddev); |
3994 | if (err) | |
3995 | break; | |
070dc6dd | 3996 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3997 | wake_up(&mddev->sb_wait); |
3998 | err = 0; | |
3999 | } else { | |
4000 | mddev->ro = 0; | |
648b629e | 4001 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
4002 | err = do_md_run(mddev); |
4003 | } | |
4004 | break; | |
4005 | case write_pending: | |
4006 | case active_idle: | |
4007 | /* these cannot be set */ | |
4008 | break; | |
4009 | } | |
6791875e N |
4010 | |
4011 | if (!err) { | |
1d23f178 N |
4012 | if (mddev->hold_active == UNTIL_IOCTL) |
4013 | mddev->hold_active = 0; | |
00bcb4ac | 4014 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4015 | } |
6791875e N |
4016 | mddev_unlock(mddev); |
4017 | return err ?: len; | |
9e653b63 | 4018 | } |
80ca3a44 | 4019 | static struct md_sysfs_entry md_array_state = |
750f199e | 4020 | __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); |
9e653b63 | 4021 | |
1e50915f | 4022 | static ssize_t |
fd01b88c | 4023 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
4024 | return sprintf(page, "%d\n", |
4025 | atomic_read(&mddev->max_corr_read_errors)); | |
4026 | } | |
4027 | ||
4028 | static ssize_t | |
fd01b88c | 4029 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f | 4030 | { |
4c9309c0 AD |
4031 | unsigned int n; |
4032 | int rv; | |
1e50915f | 4033 | |
4c9309c0 AD |
4034 | rv = kstrtouint(buf, 10, &n); |
4035 | if (rv < 0) | |
4036 | return rv; | |
4037 | atomic_set(&mddev->max_corr_read_errors, n); | |
4038 | return len; | |
1e50915f RB |
4039 | } |
4040 | ||
4041 | static struct md_sysfs_entry max_corr_read_errors = | |
4042 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
4043 | max_corrected_read_errors_store); | |
4044 | ||
6d7ff738 | 4045 | static ssize_t |
fd01b88c | 4046 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
4047 | { |
4048 | return -EINVAL; | |
4049 | } | |
4050 | ||
4051 | static ssize_t | |
fd01b88c | 4052 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
4053 | { |
4054 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
4055 | /* The new device is added to the array. | |
4056 | * If the array has a persistent superblock, we read the | |
4057 | * superblock to initialise info and check validity. | |
4058 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
4059 | * which mainly checks size. | |
4060 | */ | |
4061 | char *e; | |
4062 | int major = simple_strtoul(buf, &e, 10); | |
4063 | int minor; | |
4064 | dev_t dev; | |
3cb03002 | 4065 | struct md_rdev *rdev; |
6d7ff738 N |
4066 | int err; |
4067 | ||
4068 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
4069 | return -EINVAL; | |
4070 | minor = simple_strtoul(e+1, &e, 10); | |
4071 | if (*e && *e != '\n') | |
4072 | return -EINVAL; | |
4073 | dev = MKDEV(major, minor); | |
4074 | if (major != MAJOR(dev) || | |
4075 | minor != MINOR(dev)) | |
4076 | return -EOVERFLOW; | |
4077 | ||
6791875e N |
4078 | flush_workqueue(md_misc_wq); |
4079 | ||
4080 | err = mddev_lock(mddev); | |
4081 | if (err) | |
4082 | return err; | |
6d7ff738 N |
4083 | if (mddev->persistent) { |
4084 | rdev = md_import_device(dev, mddev->major_version, | |
4085 | mddev->minor_version); | |
4086 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
4087 | struct md_rdev *rdev0 |
4088 | = list_entry(mddev->disks.next, | |
4089 | struct md_rdev, same_set); | |
6d7ff738 N |
4090 | err = super_types[mddev->major_version] |
4091 | .load_super(rdev, rdev0, mddev->minor_version); | |
4092 | if (err < 0) | |
4093 | goto out; | |
4094 | } | |
c5d79adb N |
4095 | } else if (mddev->external) |
4096 | rdev = md_import_device(dev, -2, -1); | |
4097 | else | |
6d7ff738 N |
4098 | rdev = md_import_device(dev, -1, -1); |
4099 | ||
9a8c0fa8 N |
4100 | if (IS_ERR(rdev)) { |
4101 | mddev_unlock(mddev); | |
6d7ff738 | 4102 | return PTR_ERR(rdev); |
9a8c0fa8 | 4103 | } |
6d7ff738 N |
4104 | err = bind_rdev_to_array(rdev, mddev); |
4105 | out: | |
4106 | if (err) | |
4107 | export_rdev(rdev); | |
6791875e | 4108 | mddev_unlock(mddev); |
6d7ff738 N |
4109 | return err ? err : len; |
4110 | } | |
4111 | ||
4112 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 4113 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 4114 | |
9b1d1dac | 4115 | static ssize_t |
fd01b88c | 4116 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
4117 | { |
4118 | char *end; | |
4119 | unsigned long chunk, end_chunk; | |
6791875e | 4120 | int err; |
9b1d1dac | 4121 | |
6791875e N |
4122 | err = mddev_lock(mddev); |
4123 | if (err) | |
4124 | return err; | |
9b1d1dac PC |
4125 | if (!mddev->bitmap) |
4126 | goto out; | |
4127 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
4128 | while (*buf) { | |
4129 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
4130 | if (buf == end) break; | |
4131 | if (*end == '-') { /* range */ | |
4132 | buf = end + 1; | |
4133 | end_chunk = simple_strtoul(buf, &end, 0); | |
4134 | if (buf == end) break; | |
4135 | } | |
4136 | if (*end && !isspace(*end)) break; | |
4137 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 4138 | buf = skip_spaces(end); |
9b1d1dac PC |
4139 | } |
4140 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
4141 | out: | |
6791875e | 4142 | mddev_unlock(mddev); |
9b1d1dac PC |
4143 | return len; |
4144 | } | |
4145 | ||
4146 | static struct md_sysfs_entry md_bitmap = | |
4147 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
4148 | ||
a35b0d69 | 4149 | static ssize_t |
fd01b88c | 4150 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 4151 | { |
58c0fed4 AN |
4152 | return sprintf(page, "%llu\n", |
4153 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
4154 | } |
4155 | ||
fd01b88c | 4156 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
4157 | |
4158 | static ssize_t | |
fd01b88c | 4159 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
4160 | { |
4161 | /* If array is inactive, we can reduce the component size, but | |
4162 | * not increase it (except from 0). | |
4163 | * If array is active, we can try an on-line resize | |
4164 | */ | |
b522adcd DW |
4165 | sector_t sectors; |
4166 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 4167 | |
58c0fed4 AN |
4168 | if (err < 0) |
4169 | return err; | |
6791875e N |
4170 | err = mddev_lock(mddev); |
4171 | if (err) | |
4172 | return err; | |
a35b0d69 | 4173 | if (mddev->pers) { |
58c0fed4 | 4174 | err = update_size(mddev, sectors); |
850b2b42 | 4175 | md_update_sb(mddev, 1); |
a35b0d69 | 4176 | } else { |
58c0fed4 AN |
4177 | if (mddev->dev_sectors == 0 || |
4178 | mddev->dev_sectors > sectors) | |
4179 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
4180 | else |
4181 | err = -ENOSPC; | |
4182 | } | |
6791875e | 4183 | mddev_unlock(mddev); |
a35b0d69 N |
4184 | return err ? err : len; |
4185 | } | |
4186 | ||
4187 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 4188 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 4189 | |
83f0d77a | 4190 | /* Metadata version. |
e691063a N |
4191 | * This is one of |
4192 | * 'none' for arrays with no metadata (good luck...) | |
4193 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
4194 | * or N.M for internally known formats |
4195 | */ | |
4196 | static ssize_t | |
fd01b88c | 4197 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
4198 | { |
4199 | if (mddev->persistent) | |
4200 | return sprintf(page, "%d.%d\n", | |
4201 | mddev->major_version, mddev->minor_version); | |
e691063a N |
4202 | else if (mddev->external) |
4203 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
4204 | else |
4205 | return sprintf(page, "none\n"); | |
4206 | } | |
4207 | ||
4208 | static ssize_t | |
fd01b88c | 4209 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
4210 | { |
4211 | int major, minor; | |
4212 | char *e; | |
6791875e | 4213 | int err; |
ea43ddd8 N |
4214 | /* Changing the details of 'external' metadata is |
4215 | * always permitted. Otherwise there must be | |
4216 | * no devices attached to the array. | |
4217 | */ | |
6791875e N |
4218 | |
4219 | err = mddev_lock(mddev); | |
4220 | if (err) | |
4221 | return err; | |
4222 | err = -EBUSY; | |
ea43ddd8 N |
4223 | if (mddev->external && strncmp(buf, "external:", 9) == 0) |
4224 | ; | |
4225 | else if (!list_empty(&mddev->disks)) | |
6791875e | 4226 | goto out_unlock; |
8bb93aac | 4227 | |
6791875e | 4228 | err = 0; |
8bb93aac N |
4229 | if (cmd_match(buf, "none")) { |
4230 | mddev->persistent = 0; | |
e691063a N |
4231 | mddev->external = 0; |
4232 | mddev->major_version = 0; | |
4233 | mddev->minor_version = 90; | |
6791875e | 4234 | goto out_unlock; |
e691063a N |
4235 | } |
4236 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4237 | size_t namelen = len-9; |
e691063a N |
4238 | if (namelen >= sizeof(mddev->metadata_type)) |
4239 | namelen = sizeof(mddev->metadata_type)-1; | |
4240 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4241 | mddev->metadata_type[namelen] = 0; | |
4242 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4243 | mddev->metadata_type[--namelen] = 0; | |
4244 | mddev->persistent = 0; | |
4245 | mddev->external = 1; | |
8bb93aac N |
4246 | mddev->major_version = 0; |
4247 | mddev->minor_version = 90; | |
6791875e | 4248 | goto out_unlock; |
8bb93aac N |
4249 | } |
4250 | major = simple_strtoul(buf, &e, 10); | |
6791875e | 4251 | err = -EINVAL; |
8bb93aac | 4252 | if (e==buf || *e != '.') |
6791875e | 4253 | goto out_unlock; |
8bb93aac N |
4254 | buf = e+1; |
4255 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4256 | if (e==buf || (*e && *e != '\n') ) |
6791875e N |
4257 | goto out_unlock; |
4258 | err = -ENOENT; | |
50511da3 | 4259 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
6791875e | 4260 | goto out_unlock; |
8bb93aac N |
4261 | mddev->major_version = major; |
4262 | mddev->minor_version = minor; | |
4263 | mddev->persistent = 1; | |
e691063a | 4264 | mddev->external = 0; |
6791875e N |
4265 | err = 0; |
4266 | out_unlock: | |
4267 | mddev_unlock(mddev); | |
4268 | return err ?: len; | |
8bb93aac N |
4269 | } |
4270 | ||
4271 | static struct md_sysfs_entry md_metadata = | |
750f199e | 4272 | __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4273 | |
24dd469d | 4274 | static ssize_t |
fd01b88c | 4275 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4276 | { |
7eec314d | 4277 | char *type = "idle"; |
b7b17c9b N |
4278 | unsigned long recovery = mddev->recovery; |
4279 | if (test_bit(MD_RECOVERY_FROZEN, &recovery)) | |
b6a9ce68 | 4280 | type = "frozen"; |
b7b17c9b N |
4281 | else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || |
4282 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { | |
4283 | if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) | |
ccfcc3c1 | 4284 | type = "reshape"; |
b7b17c9b N |
4285 | else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { |
4286 | if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) | |
24dd469d | 4287 | type = "resync"; |
b7b17c9b | 4288 | else if (test_bit(MD_RECOVERY_CHECK, &recovery)) |
24dd469d N |
4289 | type = "check"; |
4290 | else | |
4291 | type = "repair"; | |
b7b17c9b | 4292 | } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) |
24dd469d | 4293 | type = "recover"; |
985ca973 N |
4294 | else if (mddev->reshape_position != MaxSector) |
4295 | type = "reshape"; | |
24dd469d N |
4296 | } |
4297 | return sprintf(page, "%s\n", type); | |
4298 | } | |
4299 | ||
4300 | static ssize_t | |
fd01b88c | 4301 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4302 | { |
7eec314d N |
4303 | if (!mddev->pers || !mddev->pers->sync_request) |
4304 | return -EINVAL; | |
4305 | ||
b6a9ce68 N |
4306 | |
4307 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
56ccc112 N |
4308 | if (cmd_match(page, "frozen")) |
4309 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4310 | else | |
4311 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
8e8e2518 N |
4312 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4313 | mddev_lock(mddev) == 0) { | |
4314 | flush_workqueue(md_misc_wq); | |
4315 | if (mddev->sync_thread) { | |
4316 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6791875e | 4317 | md_reap_sync_thread(mddev); |
6791875e | 4318 | } |
8e8e2518 | 4319 | mddev_unlock(mddev); |
7eec314d | 4320 | } |
03c902e1 N |
4321 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4322 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4323 | return -EBUSY; |
72a23c21 | 4324 | else if (cmd_match(page, "resync")) |
56ccc112 | 4325 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
72a23c21 | 4326 | else if (cmd_match(page, "recover")) { |
56ccc112 | 4327 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
72a23c21 | 4328 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
72a23c21 | 4329 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4330 | int err; |
4331 | if (mddev->pers->start_reshape == NULL) | |
4332 | return -EINVAL; | |
6791875e N |
4333 | err = mddev_lock(mddev); |
4334 | if (!err) { | |
56ccc112 | 4335 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6791875e N |
4336 | err = mddev->pers->start_reshape(mddev); |
4337 | mddev_unlock(mddev); | |
4338 | } | |
16484bf5 N |
4339 | if (err) |
4340 | return err; | |
a99ac971 | 4341 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4342 | } else { |
bce74dac | 4343 | if (cmd_match(page, "check")) |
7eec314d | 4344 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4345 | else if (!cmd_match(page, "repair")) |
7eec314d | 4346 | return -EINVAL; |
56ccc112 | 4347 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
7eec314d N |
4348 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
4349 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4350 | } |
48c26ddc N |
4351 | if (mddev->ro == 2) { |
4352 | /* A write to sync_action is enough to justify | |
4353 | * canceling read-auto mode | |
4354 | */ | |
4355 | mddev->ro = 0; | |
4356 | md_wakeup_thread(mddev->sync_thread); | |
4357 | } | |
03c902e1 | 4358 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4359 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4360 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4361 | return len; |
4362 | } | |
4363 | ||
c4a39551 | 4364 | static struct md_sysfs_entry md_scan_mode = |
750f199e | 4365 | __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
c4a39551 JB |
4366 | |
4367 | static ssize_t | |
4368 | last_sync_action_show(struct mddev *mddev, char *page) | |
4369 | { | |
4370 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4371 | } | |
4372 | ||
4373 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4374 | ||
9d88883e | 4375 | static ssize_t |
fd01b88c | 4376 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4377 | { |
4378 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4379 | (unsigned long long) |
4380 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4381 | } |
4382 | ||
80ca3a44 | 4383 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4384 | |
88202a0c | 4385 | static ssize_t |
fd01b88c | 4386 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4387 | { |
4388 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4389 | mddev->sync_speed_min ? "local": "system"); | |
4390 | } | |
4391 | ||
4392 | static ssize_t | |
fd01b88c | 4393 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c | 4394 | { |
4c9309c0 AD |
4395 | unsigned int min; |
4396 | int rv; | |
4397 | ||
88202a0c | 4398 | if (strncmp(buf, "system", 6)==0) { |
4c9309c0 AD |
4399 | min = 0; |
4400 | } else { | |
4401 | rv = kstrtouint(buf, 10, &min); | |
4402 | if (rv < 0) | |
4403 | return rv; | |
4404 | if (min == 0) | |
4405 | return -EINVAL; | |
88202a0c | 4406 | } |
88202a0c N |
4407 | mddev->sync_speed_min = min; |
4408 | return len; | |
4409 | } | |
4410 | ||
4411 | static struct md_sysfs_entry md_sync_min = | |
4412 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4413 | ||
4414 | static ssize_t | |
fd01b88c | 4415 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4416 | { |
4417 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4418 | mddev->sync_speed_max ? "local": "system"); | |
4419 | } | |
4420 | ||
4421 | static ssize_t | |
fd01b88c | 4422 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c | 4423 | { |
4c9309c0 AD |
4424 | unsigned int max; |
4425 | int rv; | |
4426 | ||
88202a0c | 4427 | if (strncmp(buf, "system", 6)==0) { |
4c9309c0 AD |
4428 | max = 0; |
4429 | } else { | |
4430 | rv = kstrtouint(buf, 10, &max); | |
4431 | if (rv < 0) | |
4432 | return rv; | |
4433 | if (max == 0) | |
4434 | return -EINVAL; | |
88202a0c | 4435 | } |
88202a0c N |
4436 | mddev->sync_speed_max = max; |
4437 | return len; | |
4438 | } | |
4439 | ||
4440 | static struct md_sysfs_entry md_sync_max = | |
4441 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4442 | ||
d7f3d291 | 4443 | static ssize_t |
fd01b88c | 4444 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4445 | { |
4446 | return sprintf(page, "%d\n", mddev->degraded); | |
4447 | } | |
4448 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4449 | |
90b08710 | 4450 | static ssize_t |
fd01b88c | 4451 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4452 | { |
4453 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4454 | } | |
4455 | ||
4456 | static ssize_t | |
fd01b88c | 4457 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4458 | { |
4459 | long n; | |
4460 | ||
b29bebd6 | 4461 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4462 | return -EINVAL; |
4463 | ||
4464 | if (n != 0 && n != 1) | |
4465 | return -EINVAL; | |
4466 | ||
4467 | mddev->parallel_resync = n; | |
4468 | ||
4469 | if (mddev->sync_thread) | |
4470 | wake_up(&resync_wait); | |
4471 | ||
4472 | return len; | |
4473 | } | |
4474 | ||
4475 | /* force parallel resync, even with shared block devices */ | |
4476 | static struct md_sysfs_entry md_sync_force_parallel = | |
4477 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4478 | sync_force_parallel_show, sync_force_parallel_store); | |
4479 | ||
88202a0c | 4480 | static ssize_t |
fd01b88c | 4481 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4482 | { |
4483 | unsigned long resync, dt, db; | |
d1a7c503 N |
4484 | if (mddev->curr_resync == 0) |
4485 | return sprintf(page, "none\n"); | |
9687a60c AN |
4486 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4487 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4488 | if (!dt) dt++; |
9687a60c AN |
4489 | db = resync - mddev->resync_mark_cnt; |
4490 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4491 | } |
4492 | ||
80ca3a44 | 4493 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4494 | |
4495 | static ssize_t | |
fd01b88c | 4496 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4497 | { |
13ae864b | 4498 | unsigned long long max_sectors, resync; |
88202a0c | 4499 | |
acb180b0 N |
4500 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4501 | return sprintf(page, "none\n"); | |
4502 | ||
72f36d59 N |
4503 | if (mddev->curr_resync == 1 || |
4504 | mddev->curr_resync == 2) | |
4505 | return sprintf(page, "delayed\n"); | |
4506 | ||
c804cdec N |
4507 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4508 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4509 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4510 | else |
58c0fed4 | 4511 | max_sectors = mddev->dev_sectors; |
88202a0c | 4512 | |
acb180b0 | 4513 | resync = mddev->curr_resync_completed; |
13ae864b | 4514 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4515 | } |
4516 | ||
750f199e N |
4517 | static struct md_sysfs_entry md_sync_completed = |
4518 | __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); | |
88202a0c | 4519 | |
5e96ee65 | 4520 | static ssize_t |
fd01b88c | 4521 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4522 | { |
4523 | return sprintf(page, "%llu\n", | |
4524 | (unsigned long long)mddev->resync_min); | |
4525 | } | |
4526 | static ssize_t | |
fd01b88c | 4527 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4528 | { |
4529 | unsigned long long min; | |
23da422b | 4530 | int err; |
23da422b | 4531 | |
b29bebd6 | 4532 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 | 4533 | return -EINVAL; |
23da422b N |
4534 | |
4535 | spin_lock(&mddev->lock); | |
4536 | err = -EINVAL; | |
5e96ee65 | 4537 | if (min > mddev->resync_max) |
23da422b N |
4538 | goto out_unlock; |
4539 | ||
4540 | err = -EBUSY; | |
5e96ee65 | 4541 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4542 | goto out_unlock; |
5e96ee65 | 4543 | |
50c37b13 N |
4544 | /* Round down to multiple of 4K for safety */ |
4545 | mddev->resync_min = round_down(min, 8); | |
23da422b | 4546 | err = 0; |
5e96ee65 | 4547 | |
23da422b N |
4548 | out_unlock: |
4549 | spin_unlock(&mddev->lock); | |
4550 | return err ?: len; | |
5e96ee65 NB |
4551 | } |
4552 | ||
4553 | static struct md_sysfs_entry md_min_sync = | |
4554 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4555 | ||
c6207277 | 4556 | static ssize_t |
fd01b88c | 4557 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4558 | { |
4559 | if (mddev->resync_max == MaxSector) | |
4560 | return sprintf(page, "max\n"); | |
4561 | else | |
4562 | return sprintf(page, "%llu\n", | |
4563 | (unsigned long long)mddev->resync_max); | |
4564 | } | |
4565 | static ssize_t | |
fd01b88c | 4566 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 | 4567 | { |
23da422b N |
4568 | int err; |
4569 | spin_lock(&mddev->lock); | |
c6207277 N |
4570 | if (strncmp(buf, "max", 3) == 0) |
4571 | mddev->resync_max = MaxSector; | |
4572 | else { | |
5e96ee65 | 4573 | unsigned long long max; |
23da422b N |
4574 | int chunk; |
4575 | ||
4576 | err = -EINVAL; | |
b29bebd6 | 4577 | if (kstrtoull(buf, 10, &max)) |
23da422b | 4578 | goto out_unlock; |
5e96ee65 | 4579 | if (max < mddev->resync_min) |
23da422b N |
4580 | goto out_unlock; |
4581 | ||
4582 | err = -EBUSY; | |
c6207277 | 4583 | if (max < mddev->resync_max && |
4d484a4a | 4584 | mddev->ro == 0 && |
c6207277 | 4585 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4586 | goto out_unlock; |
c6207277 N |
4587 | |
4588 | /* Must be a multiple of chunk_size */ | |
23da422b N |
4589 | chunk = mddev->chunk_sectors; |
4590 | if (chunk) { | |
2ac06c33 | 4591 | sector_t temp = max; |
23da422b N |
4592 | |
4593 | err = -EINVAL; | |
4594 | if (sector_div(temp, chunk)) | |
4595 | goto out_unlock; | |
c6207277 N |
4596 | } |
4597 | mddev->resync_max = max; | |
4598 | } | |
4599 | wake_up(&mddev->recovery_wait); | |
23da422b N |
4600 | err = 0; |
4601 | out_unlock: | |
4602 | spin_unlock(&mddev->lock); | |
4603 | return err ?: len; | |
c6207277 N |
4604 | } |
4605 | ||
4606 | static struct md_sysfs_entry md_max_sync = | |
4607 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4608 | ||
e464eafd | 4609 | static ssize_t |
fd01b88c | 4610 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4611 | { |
4612 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4613 | } | |
4614 | ||
4615 | static ssize_t | |
fd01b88c | 4616 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd | 4617 | { |
4c9309c0 | 4618 | unsigned long long old, new; |
6791875e | 4619 | int err; |
e464eafd | 4620 | |
4c9309c0 AD |
4621 | err = kstrtoull(buf, 10, &new); |
4622 | if (err < 0) | |
4623 | return err; | |
4624 | if (new != (sector_t)new) | |
e464eafd | 4625 | return -EINVAL; |
23ddff37 | 4626 | |
6791875e N |
4627 | err = mddev_lock(mddev); |
4628 | if (err) | |
4629 | return err; | |
4630 | err = -EINVAL; | |
4631 | if (mddev->pers == NULL || | |
4632 | mddev->pers->quiesce == NULL) | |
4633 | goto unlock; | |
4634 | old = mddev->suspend_lo; | |
23ddff37 N |
4635 | mddev->suspend_lo = new; |
4636 | if (new >= old) | |
4637 | /* Shrinking suspended region */ | |
e464eafd | 4638 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4639 | else { |
4640 | /* Expanding suspended region - need to wait */ | |
4641 | mddev->pers->quiesce(mddev, 1); | |
4642 | mddev->pers->quiesce(mddev, 0); | |
4643 | } | |
6791875e N |
4644 | err = 0; |
4645 | unlock: | |
4646 | mddev_unlock(mddev); | |
4647 | return err ?: len; | |
e464eafd N |
4648 | } |
4649 | static struct md_sysfs_entry md_suspend_lo = | |
4650 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4651 | ||
e464eafd | 4652 | static ssize_t |
fd01b88c | 4653 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4654 | { |
4655 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4656 | } | |
4657 | ||
4658 | static ssize_t | |
fd01b88c | 4659 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd | 4660 | { |
4c9309c0 | 4661 | unsigned long long old, new; |
6791875e | 4662 | int err; |
e464eafd | 4663 | |
4c9309c0 AD |
4664 | err = kstrtoull(buf, 10, &new); |
4665 | if (err < 0) | |
4666 | return err; | |
4667 | if (new != (sector_t)new) | |
e464eafd | 4668 | return -EINVAL; |
23ddff37 | 4669 | |
6791875e N |
4670 | err = mddev_lock(mddev); |
4671 | if (err) | |
4672 | return err; | |
4673 | err = -EINVAL; | |
4674 | if (mddev->pers == NULL || | |
4675 | mddev->pers->quiesce == NULL) | |
4676 | goto unlock; | |
4677 | old = mddev->suspend_hi; | |
23ddff37 N |
4678 | mddev->suspend_hi = new; |
4679 | if (new <= old) | |
4680 | /* Shrinking suspended region */ | |
4681 | mddev->pers->quiesce(mddev, 2); | |
4682 | else { | |
4683 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4684 | mddev->pers->quiesce(mddev, 1); |
4685 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 | 4686 | } |
6791875e N |
4687 | err = 0; |
4688 | unlock: | |
4689 | mddev_unlock(mddev); | |
4690 | return err ?: len; | |
e464eafd N |
4691 | } |
4692 | static struct md_sysfs_entry md_suspend_hi = | |
4693 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4694 | ||
08a02ecd | 4695 | static ssize_t |
fd01b88c | 4696 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4697 | { |
4698 | if (mddev->reshape_position != MaxSector) | |
4699 | return sprintf(page, "%llu\n", | |
4700 | (unsigned long long)mddev->reshape_position); | |
4701 | strcpy(page, "none\n"); | |
4702 | return 5; | |
4703 | } | |
4704 | ||
4705 | static ssize_t | |
fd01b88c | 4706 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4707 | { |
c6563a8c | 4708 | struct md_rdev *rdev; |
4c9309c0 | 4709 | unsigned long long new; |
6791875e | 4710 | int err; |
6791875e | 4711 | |
4c9309c0 AD |
4712 | err = kstrtoull(buf, 10, &new); |
4713 | if (err < 0) | |
4714 | return err; | |
4715 | if (new != (sector_t)new) | |
08a02ecd | 4716 | return -EINVAL; |
6791875e N |
4717 | err = mddev_lock(mddev); |
4718 | if (err) | |
4719 | return err; | |
4720 | err = -EBUSY; | |
4721 | if (mddev->pers) | |
4722 | goto unlock; | |
08a02ecd N |
4723 | mddev->reshape_position = new; |
4724 | mddev->delta_disks = 0; | |
2c810cdd | 4725 | mddev->reshape_backwards = 0; |
08a02ecd N |
4726 | mddev->new_level = mddev->level; |
4727 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4728 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4729 | rdev_for_each(rdev, mddev) |
4730 | rdev->new_data_offset = rdev->data_offset; | |
6791875e N |
4731 | err = 0; |
4732 | unlock: | |
4733 | mddev_unlock(mddev); | |
4734 | return err ?: len; | |
08a02ecd N |
4735 | } |
4736 | ||
4737 | static struct md_sysfs_entry md_reshape_position = | |
4738 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4739 | reshape_position_store); | |
4740 | ||
2c810cdd N |
4741 | static ssize_t |
4742 | reshape_direction_show(struct mddev *mddev, char *page) | |
4743 | { | |
4744 | return sprintf(page, "%s\n", | |
4745 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4746 | } | |
4747 | ||
4748 | static ssize_t | |
4749 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4750 | { | |
4751 | int backwards = 0; | |
6791875e N |
4752 | int err; |
4753 | ||
2c810cdd N |
4754 | if (cmd_match(buf, "forwards")) |
4755 | backwards = 0; | |
4756 | else if (cmd_match(buf, "backwards")) | |
4757 | backwards = 1; | |
4758 | else | |
4759 | return -EINVAL; | |
4760 | if (mddev->reshape_backwards == backwards) | |
4761 | return len; | |
4762 | ||
6791875e N |
4763 | err = mddev_lock(mddev); |
4764 | if (err) | |
4765 | return err; | |
2c810cdd N |
4766 | /* check if we are allowed to change */ |
4767 | if (mddev->delta_disks) | |
6791875e N |
4768 | err = -EBUSY; |
4769 | else if (mddev->persistent && | |
2c810cdd | 4770 | mddev->major_version == 0) |
6791875e N |
4771 | err = -EINVAL; |
4772 | else | |
4773 | mddev->reshape_backwards = backwards; | |
4774 | mddev_unlock(mddev); | |
4775 | return err ?: len; | |
2c810cdd N |
4776 | } |
4777 | ||
4778 | static struct md_sysfs_entry md_reshape_direction = | |
4779 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4780 | reshape_direction_store); | |
4781 | ||
b522adcd | 4782 | static ssize_t |
fd01b88c | 4783 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4784 | { |
4785 | if (mddev->external_size) | |
4786 | return sprintf(page, "%llu\n", | |
4787 | (unsigned long long)mddev->array_sectors/2); | |
4788 | else | |
4789 | return sprintf(page, "default\n"); | |
4790 | } | |
4791 | ||
4792 | static ssize_t | |
fd01b88c | 4793 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4794 | { |
4795 | sector_t sectors; | |
6791875e N |
4796 | int err; |
4797 | ||
4798 | err = mddev_lock(mddev); | |
4799 | if (err) | |
4800 | return err; | |
b522adcd DW |
4801 | |
4802 | if (strncmp(buf, "default", 7) == 0) { | |
4803 | if (mddev->pers) | |
4804 | sectors = mddev->pers->size(mddev, 0, 0); | |
4805 | else | |
4806 | sectors = mddev->array_sectors; | |
4807 | ||
4808 | mddev->external_size = 0; | |
4809 | } else { | |
4810 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
6791875e N |
4811 | err = -EINVAL; |
4812 | else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
4813 | err = -E2BIG; | |
4814 | else | |
4815 | mddev->external_size = 1; | |
b522adcd DW |
4816 | } |
4817 | ||
6791875e N |
4818 | if (!err) { |
4819 | mddev->array_sectors = sectors; | |
4820 | if (mddev->pers) { | |
4821 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
4822 | revalidate_disk(mddev->gendisk); | |
4823 | } | |
cbe6ef1d | 4824 | } |
6791875e N |
4825 | mddev_unlock(mddev); |
4826 | return err ?: len; | |
b522adcd DW |
4827 | } |
4828 | ||
4829 | static struct md_sysfs_entry md_array_size = | |
4830 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4831 | array_size_store); | |
e464eafd | 4832 | |
eae1701f N |
4833 | static struct attribute *md_default_attrs[] = { |
4834 | &md_level.attr, | |
d4dbd025 | 4835 | &md_layout.attr, |
eae1701f | 4836 | &md_raid_disks.attr, |
3b34380a | 4837 | &md_chunk_size.attr, |
a35b0d69 | 4838 | &md_size.attr, |
a94213b1 | 4839 | &md_resync_start.attr, |
8bb93aac | 4840 | &md_metadata.attr, |
6d7ff738 | 4841 | &md_new_device.attr, |
16f17b39 | 4842 | &md_safe_delay.attr, |
9e653b63 | 4843 | &md_array_state.attr, |
08a02ecd | 4844 | &md_reshape_position.attr, |
2c810cdd | 4845 | &md_reshape_direction.attr, |
b522adcd | 4846 | &md_array_size.attr, |
1e50915f | 4847 | &max_corr_read_errors.attr, |
411036fa N |
4848 | NULL, |
4849 | }; | |
4850 | ||
4851 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4852 | &md_scan_mode.attr, |
c4a39551 | 4853 | &md_last_scan_mode.attr, |
9d88883e | 4854 | &md_mismatches.attr, |
88202a0c N |
4855 | &md_sync_min.attr, |
4856 | &md_sync_max.attr, | |
4857 | &md_sync_speed.attr, | |
90b08710 | 4858 | &md_sync_force_parallel.attr, |
88202a0c | 4859 | &md_sync_completed.attr, |
5e96ee65 | 4860 | &md_min_sync.attr, |
c6207277 | 4861 | &md_max_sync.attr, |
e464eafd N |
4862 | &md_suspend_lo.attr, |
4863 | &md_suspend_hi.attr, | |
9b1d1dac | 4864 | &md_bitmap.attr, |
d7f3d291 | 4865 | &md_degraded.attr, |
eae1701f N |
4866 | NULL, |
4867 | }; | |
411036fa N |
4868 | static struct attribute_group md_redundancy_group = { |
4869 | .name = NULL, | |
4870 | .attrs = md_redundancy_attrs, | |
4871 | }; | |
4872 | ||
eae1701f N |
4873 | static ssize_t |
4874 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4875 | { | |
4876 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4877 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4878 | ssize_t rv; |
eae1701f N |
4879 | |
4880 | if (!entry->show) | |
4881 | return -EIO; | |
af8a2434 N |
4882 | spin_lock(&all_mddevs_lock); |
4883 | if (list_empty(&mddev->all_mddevs)) { | |
4884 | spin_unlock(&all_mddevs_lock); | |
4885 | return -EBUSY; | |
4886 | } | |
4887 | mddev_get(mddev); | |
4888 | spin_unlock(&all_mddevs_lock); | |
4889 | ||
b7b17c9b | 4890 | rv = entry->show(mddev, page); |
af8a2434 | 4891 | mddev_put(mddev); |
96de1e66 | 4892 | return rv; |
eae1701f N |
4893 | } |
4894 | ||
4895 | static ssize_t | |
4896 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4897 | const char *page, size_t length) | |
4898 | { | |
4899 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4900 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4901 | ssize_t rv; |
eae1701f N |
4902 | |
4903 | if (!entry->store) | |
4904 | return -EIO; | |
67463acb N |
4905 | if (!capable(CAP_SYS_ADMIN)) |
4906 | return -EACCES; | |
af8a2434 N |
4907 | spin_lock(&all_mddevs_lock); |
4908 | if (list_empty(&mddev->all_mddevs)) { | |
4909 | spin_unlock(&all_mddevs_lock); | |
4910 | return -EBUSY; | |
4911 | } | |
4912 | mddev_get(mddev); | |
4913 | spin_unlock(&all_mddevs_lock); | |
6791875e | 4914 | rv = entry->store(mddev, page, length); |
af8a2434 | 4915 | mddev_put(mddev); |
96de1e66 | 4916 | return rv; |
eae1701f N |
4917 | } |
4918 | ||
4919 | static void md_free(struct kobject *ko) | |
4920 | { | |
fd01b88c | 4921 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4922 | |
4923 | if (mddev->sysfs_state) | |
4924 | sysfs_put(mddev->sysfs_state); | |
4925 | ||
6cd18e71 N |
4926 | if (mddev->queue) |
4927 | blk_cleanup_queue(mddev->queue); | |
a21d1504 N |
4928 | if (mddev->gendisk) { |
4929 | del_gendisk(mddev->gendisk); | |
4930 | put_disk(mddev->gendisk); | |
4931 | } | |
a21d1504 | 4932 | |
eae1701f N |
4933 | kfree(mddev); |
4934 | } | |
4935 | ||
52cf25d0 | 4936 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4937 | .show = md_attr_show, |
4938 | .store = md_attr_store, | |
4939 | }; | |
4940 | static struct kobj_type md_ktype = { | |
4941 | .release = md_free, | |
4942 | .sysfs_ops = &md_sysfs_ops, | |
4943 | .default_attrs = md_default_attrs, | |
4944 | }; | |
4945 | ||
1da177e4 LT |
4946 | int mdp_major = 0; |
4947 | ||
5fd3a17e DW |
4948 | static void mddev_delayed_delete(struct work_struct *ws) |
4949 | { | |
fd01b88c | 4950 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4951 | |
43a70507 | 4952 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4953 | kobject_del(&mddev->kobj); |
4954 | kobject_put(&mddev->kobj); | |
4955 | } | |
4956 | ||
efeb53c0 | 4957 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4958 | { |
48c9c27b | 4959 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4960 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4961 | struct gendisk *disk; |
efeb53c0 N |
4962 | int partitioned; |
4963 | int shift; | |
4964 | int unit; | |
3830c62f | 4965 | int error; |
1da177e4 LT |
4966 | |
4967 | if (!mddev) | |
efeb53c0 N |
4968 | return -ENODEV; |
4969 | ||
4970 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4971 | shift = partitioned ? MdpMinorShift : 0; | |
4972 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4973 | |
e804ac78 TH |
4974 | /* wait for any previous instance of this device to be |
4975 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4976 | */ |
e804ac78 | 4977 | flush_workqueue(md_misc_wq); |
d3374825 | 4978 | |
48c9c27b | 4979 | mutex_lock(&disks_mutex); |
0909dc44 N |
4980 | error = -EEXIST; |
4981 | if (mddev->gendisk) | |
4982 | goto abort; | |
efeb53c0 N |
4983 | |
4984 | if (name) { | |
4985 | /* Need to ensure that 'name' is not a duplicate. | |
4986 | */ | |
fd01b88c | 4987 | struct mddev *mddev2; |
efeb53c0 N |
4988 | spin_lock(&all_mddevs_lock); |
4989 | ||
4990 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4991 | if (mddev2->gendisk && | |
4992 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4993 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4994 | goto abort; |
efeb53c0 N |
4995 | } |
4996 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4997 | } |
8b765398 | 4998 | |
0909dc44 | 4999 | error = -ENOMEM; |
8b765398 | 5000 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
5001 | if (!mddev->queue) |
5002 | goto abort; | |
409c57f3 N |
5003 | mddev->queue->queuedata = mddev; |
5004 | ||
409c57f3 | 5005 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 5006 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 5007 | |
1da177e4 LT |
5008 | disk = alloc_disk(1 << shift); |
5009 | if (!disk) { | |
8b765398 N |
5010 | blk_cleanup_queue(mddev->queue); |
5011 | mddev->queue = NULL; | |
0909dc44 | 5012 | goto abort; |
1da177e4 | 5013 | } |
efeb53c0 | 5014 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 5015 | disk->first_minor = unit << shift; |
efeb53c0 N |
5016 | if (name) |
5017 | strcpy(disk->disk_name, name); | |
5018 | else if (partitioned) | |
1da177e4 | 5019 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 5020 | else |
1da177e4 | 5021 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
5022 | disk->fops = &md_fops; |
5023 | disk->private_data = mddev; | |
5024 | disk->queue = mddev->queue; | |
b0140891 | 5025 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 5026 | /* Allow extended partitions. This makes the |
d3374825 | 5027 | * 'mdp' device redundant, but we can't really |
92850bbd N |
5028 | * remove it now. |
5029 | */ | |
5030 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 5031 | mddev->gendisk = disk; |
b0140891 N |
5032 | /* As soon as we call add_disk(), another thread could get |
5033 | * through to md_open, so make sure it doesn't get too far | |
5034 | */ | |
5035 | mutex_lock(&mddev->open_mutex); | |
5036 | add_disk(disk); | |
5037 | ||
ed9e1982 TH |
5038 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
5039 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
5040 | if (error) { |
5041 | /* This isn't possible, but as kobject_init_and_add is marked | |
5042 | * __must_check, we must do something with the result | |
5043 | */ | |
5e55e2f5 N |
5044 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
5045 | disk->disk_name); | |
0909dc44 N |
5046 | error = 0; |
5047 | } | |
00bcb4ac N |
5048 | if (mddev->kobj.sd && |
5049 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 5050 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 5051 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
5052 | abort: |
5053 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 5054 | if (!error && mddev->kobj.sd) { |
3830c62f | 5055 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 5056 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 5057 | } |
d3374825 | 5058 | mddev_put(mddev); |
0909dc44 | 5059 | return error; |
efeb53c0 N |
5060 | } |
5061 | ||
5062 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
5063 | { | |
5064 | md_alloc(dev, NULL); | |
1da177e4 LT |
5065 | return NULL; |
5066 | } | |
5067 | ||
efeb53c0 N |
5068 | static int add_named_array(const char *val, struct kernel_param *kp) |
5069 | { | |
5070 | /* val must be "md_*" where * is not all digits. | |
5071 | * We allocate an array with a large free minor number, and | |
5072 | * set the name to val. val must not already be an active name. | |
5073 | */ | |
5074 | int len = strlen(val); | |
5075 | char buf[DISK_NAME_LEN]; | |
5076 | ||
5077 | while (len && val[len-1] == '\n') | |
5078 | len--; | |
5079 | if (len >= DISK_NAME_LEN) | |
5080 | return -E2BIG; | |
5081 | strlcpy(buf, val, len+1); | |
5082 | if (strncmp(buf, "md_", 3) != 0) | |
5083 | return -EINVAL; | |
5084 | return md_alloc(0, buf); | |
5085 | } | |
5086 | ||
1da177e4 LT |
5087 | static void md_safemode_timeout(unsigned long data) |
5088 | { | |
fd01b88c | 5089 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 5090 | |
0fd62b86 NB |
5091 | if (!atomic_read(&mddev->writes_pending)) { |
5092 | mddev->safemode = 1; | |
5093 | if (mddev->external) | |
00bcb4ac | 5094 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 5095 | } |
1da177e4 LT |
5096 | md_wakeup_thread(mddev->thread); |
5097 | } | |
5098 | ||
6ff8d8ec | 5099 | static int start_dirty_degraded; |
1da177e4 | 5100 | |
fd01b88c | 5101 | int md_run(struct mddev *mddev) |
1da177e4 | 5102 | { |
2604b703 | 5103 | int err; |
3cb03002 | 5104 | struct md_rdev *rdev; |
84fc4b56 | 5105 | struct md_personality *pers; |
1da177e4 | 5106 | |
a757e64c N |
5107 | if (list_empty(&mddev->disks)) |
5108 | /* cannot run an array with no devices.. */ | |
1da177e4 | 5109 | return -EINVAL; |
1da177e4 LT |
5110 | |
5111 | if (mddev->pers) | |
5112 | return -EBUSY; | |
bb4f1e9d N |
5113 | /* Cannot run until previous stop completes properly */ |
5114 | if (mddev->sysfs_active) | |
5115 | return -EBUSY; | |
b6eb127d | 5116 | |
1da177e4 LT |
5117 | /* |
5118 | * Analyze all RAID superblock(s) | |
5119 | */ | |
1ec4a939 N |
5120 | if (!mddev->raid_disks) { |
5121 | if (!mddev->persistent) | |
5122 | return -EINVAL; | |
a757e64c | 5123 | analyze_sbs(mddev); |
1ec4a939 | 5124 | } |
1da177e4 | 5125 | |
d9d166c2 N |
5126 | if (mddev->level != LEVEL_NONE) |
5127 | request_module("md-level-%d", mddev->level); | |
5128 | else if (mddev->clevel[0]) | |
5129 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
5130 | |
5131 | /* | |
5132 | * Drop all container device buffers, from now on | |
5133 | * the only valid external interface is through the md | |
5134 | * device. | |
1da177e4 | 5135 | */ |
dafb20fa | 5136 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 5137 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5138 | continue; |
5139 | sync_blockdev(rdev->bdev); | |
f98393a6 | 5140 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
5141 | |
5142 | /* perform some consistency tests on the device. | |
5143 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 5144 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 5145 | */ |
a6ff7e08 JB |
5146 | if (rdev->meta_bdev) { |
5147 | /* Nothing to check */; | |
5148 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
5149 | if (mddev->dev_sectors && |
5150 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 5151 | > rdev->sb_start) { |
f0d76d70 N |
5152 | printk("md: %s: data overlaps metadata\n", |
5153 | mdname(mddev)); | |
5154 | return -EINVAL; | |
5155 | } | |
5156 | } else { | |
0f420358 | 5157 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
5158 | > rdev->data_offset) { |
5159 | printk("md: %s: metadata overlaps data\n", | |
5160 | mdname(mddev)); | |
5161 | return -EINVAL; | |
5162 | } | |
5163 | } | |
00bcb4ac | 5164 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
5165 | } |
5166 | ||
a167f663 | 5167 | if (mddev->bio_set == NULL) |
395c72a7 | 5168 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 5169 | |
1da177e4 | 5170 | spin_lock(&pers_lock); |
d9d166c2 | 5171 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 5172 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 5173 | spin_unlock(&pers_lock); |
d9d166c2 N |
5174 | if (mddev->level != LEVEL_NONE) |
5175 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
5176 | mddev->level); | |
5177 | else | |
5178 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
5179 | mddev->clevel); | |
1da177e4 LT |
5180 | return -EINVAL; |
5181 | } | |
1da177e4 | 5182 | spin_unlock(&pers_lock); |
34817e8c N |
5183 | if (mddev->level != pers->level) { |
5184 | mddev->level = pers->level; | |
5185 | mddev->new_level = pers->level; | |
5186 | } | |
d9d166c2 | 5187 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 5188 | |
f6705578 | 5189 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 5190 | pers->start_reshape == NULL) { |
f6705578 | 5191 | /* This personality cannot handle reshaping... */ |
f6705578 N |
5192 | module_put(pers->owner); |
5193 | return -EINVAL; | |
5194 | } | |
5195 | ||
7dd5e7c3 N |
5196 | if (pers->sync_request) { |
5197 | /* Warn if this is a potentially silly | |
5198 | * configuration. | |
5199 | */ | |
5200 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5201 | struct md_rdev *rdev2; |
7dd5e7c3 | 5202 | int warned = 0; |
159ec1fc | 5203 | |
dafb20fa N |
5204 | rdev_for_each(rdev, mddev) |
5205 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
5206 | if (rdev < rdev2 && |
5207 | rdev->bdev->bd_contains == | |
5208 | rdev2->bdev->bd_contains) { | |
5209 | printk(KERN_WARNING | |
5210 | "%s: WARNING: %s appears to be" | |
5211 | " on the same physical disk as" | |
5212 | " %s.\n", | |
5213 | mdname(mddev), | |
5214 | bdevname(rdev->bdev,b), | |
5215 | bdevname(rdev2->bdev,b2)); | |
5216 | warned = 1; | |
5217 | } | |
5218 | } | |
159ec1fc | 5219 | |
7dd5e7c3 N |
5220 | if (warned) |
5221 | printk(KERN_WARNING | |
5222 | "True protection against single-disk" | |
5223 | " failure might be compromised.\n"); | |
5224 | } | |
5225 | ||
657390d2 | 5226 | mddev->recovery = 0; |
58c0fed4 AN |
5227 | /* may be over-ridden by personality */ |
5228 | mddev->resync_max_sectors = mddev->dev_sectors; | |
5229 | ||
6ff8d8ec | 5230 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 5231 | |
0f9552b5 | 5232 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
5233 | mddev->ro = 2; /* read-only, but switch on first write */ |
5234 | ||
36d091f4 | 5235 | err = pers->run(mddev); |
13e53df3 AN |
5236 | if (err) |
5237 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
36d091f4 | 5238 | else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { |
b522adcd DW |
5239 | WARN_ONCE(!mddev->external_size, "%s: default size too small," |
5240 | " but 'external_size' not in effect?\n", __func__); | |
5241 | printk(KERN_ERR | |
5242 | "md: invalid array_size %llu > default size %llu\n", | |
5243 | (unsigned long long)mddev->array_sectors / 2, | |
36d091f4 | 5244 | (unsigned long long)pers->size(mddev, 0, 0) / 2); |
b522adcd | 5245 | err = -EINVAL; |
b522adcd | 5246 | } |
36d091f4 | 5247 | if (err == 0 && pers->sync_request && |
ef99bf48 | 5248 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { |
f9209a32 GR |
5249 | struct bitmap *bitmap; |
5250 | ||
5251 | bitmap = bitmap_create(mddev, -1); | |
5252 | if (IS_ERR(bitmap)) { | |
5253 | err = PTR_ERR(bitmap); | |
b15c2e57 N |
5254 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", |
5255 | mdname(mddev), err); | |
f9209a32 GR |
5256 | } else |
5257 | mddev->bitmap = bitmap; | |
5258 | ||
b15c2e57 | 5259 | } |
1da177e4 | 5260 | if (err) { |
5aa61f42 | 5261 | mddev_detach(mddev); |
0c35bd47 N |
5262 | if (mddev->private) |
5263 | pers->free(mddev, mddev->private); | |
bd691922 | 5264 | mddev->private = NULL; |
36d091f4 | 5265 | module_put(pers->owner); |
32a7627c N |
5266 | bitmap_destroy(mddev); |
5267 | return err; | |
1da177e4 | 5268 | } |
5c675f83 N |
5269 | if (mddev->queue) { |
5270 | mddev->queue->backing_dev_info.congested_data = mddev; | |
5271 | mddev->queue->backing_dev_info.congested_fn = md_congested; | |
5272 | } | |
36d091f4 | 5273 | if (pers->sync_request) { |
00bcb4ac N |
5274 | if (mddev->kobj.sd && |
5275 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
5276 | printk(KERN_WARNING |
5277 | "md: cannot register extra attributes for %s\n", | |
5278 | mdname(mddev)); | |
00bcb4ac | 5279 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 5280 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
5281 | mddev->ro = 0; |
5282 | ||
f72ffdd6 | 5283 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
5284 | atomic_set(&mddev->max_corr_read_errors, |
5285 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 | 5286 | mddev->safemode = 0; |
28c1b9fd GR |
5287 | if (mddev_is_clustered(mddev)) |
5288 | mddev->safemode_delay = 0; | |
5289 | else | |
5290 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ | |
1da177e4 | 5291 | mddev->in_sync = 1; |
0ca69886 | 5292 | smp_wmb(); |
36d091f4 N |
5293 | spin_lock(&mddev->lock); |
5294 | mddev->pers = pers; | |
0ca69886 | 5295 | mddev->ready = 1; |
36d091f4 | 5296 | spin_unlock(&mddev->lock); |
dafb20fa | 5297 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5298 | if (rdev->raid_disk >= 0) |
5299 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 5300 | /* failure here is OK */; |
f72ffdd6 | 5301 | |
a4a3d26d N |
5302 | if (mddev->degraded && !mddev->ro) |
5303 | /* This ensures that recovering status is reported immediately | |
5304 | * via sysfs - until a lack of spares is confirmed. | |
5305 | */ | |
5306 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
1da177e4 | 5307 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 5308 | |
7a0a5355 | 5309 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 5310 | md_update_sb(mddev, 0); |
1da177e4 | 5311 | |
d7603b7e | 5312 | md_new_event(mddev); |
00bcb4ac N |
5313 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
5314 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 5315 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
5316 | return 0; |
5317 | } | |
390ee602 | 5318 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 5319 | |
fd01b88c | 5320 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
5321 | { |
5322 | int err; | |
5323 | ||
5324 | err = md_run(mddev); | |
5325 | if (err) | |
5326 | goto out; | |
69e51b44 N |
5327 | err = bitmap_load(mddev); |
5328 | if (err) { | |
5329 | bitmap_destroy(mddev); | |
5330 | goto out; | |
5331 | } | |
0fd018af | 5332 | |
28c1b9fd GR |
5333 | if (mddev_is_clustered(mddev)) |
5334 | md_allow_write(mddev); | |
5335 | ||
0fd018af JB |
5336 | md_wakeup_thread(mddev->thread); |
5337 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5338 | ||
fe60b014 N |
5339 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5340 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5341 | mddev->changed = 1; |
fe60b014 N |
5342 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5343 | out: | |
5344 | return err; | |
5345 | } | |
5346 | ||
fd01b88c | 5347 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5348 | { |
5349 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5350 | |
80fab1d7 | 5351 | /* Complain if it has no devices */ |
1da177e4 | 5352 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5353 | return -ENXIO; |
5354 | if (!mddev->pers) | |
5355 | return -EINVAL; | |
5356 | if (!mddev->ro) | |
5357 | return -EBUSY; | |
339421de SL |
5358 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
5359 | struct md_rdev *rdev; | |
5360 | bool has_journal = false; | |
5361 | ||
5362 | rcu_read_lock(); | |
5363 | rdev_for_each_rcu(rdev, mddev) { | |
5364 | if (test_bit(Journal, &rdev->flags) && | |
5365 | !test_bit(Faulty, &rdev->flags)) { | |
5366 | has_journal = true; | |
5367 | break; | |
5368 | } | |
5369 | } | |
5370 | rcu_read_unlock(); | |
5371 | ||
5372 | /* Don't restart rw with journal missing/faulty */ | |
5373 | if (!has_journal) | |
5374 | return -EINVAL; | |
5375 | } | |
5376 | ||
80fab1d7 AN |
5377 | mddev->safemode = 0; |
5378 | mddev->ro = 0; | |
5379 | set_disk_ro(disk, 0); | |
5380 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5381 | mdname(mddev)); | |
5382 | /* Kick recovery or resync if necessary */ | |
5383 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5384 | md_wakeup_thread(mddev->thread); | |
5385 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5386 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5387 | return 0; |
1da177e4 LT |
5388 | } |
5389 | ||
fd01b88c | 5390 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5391 | { |
5392 | mddev->array_sectors = 0; | |
5393 | mddev->external_size = 0; | |
5394 | mddev->dev_sectors = 0; | |
5395 | mddev->raid_disks = 0; | |
5396 | mddev->recovery_cp = 0; | |
5397 | mddev->resync_min = 0; | |
5398 | mddev->resync_max = MaxSector; | |
5399 | mddev->reshape_position = MaxSector; | |
5400 | mddev->external = 0; | |
5401 | mddev->persistent = 0; | |
5402 | mddev->level = LEVEL_NONE; | |
5403 | mddev->clevel[0] = 0; | |
5404 | mddev->flags = 0; | |
5405 | mddev->ro = 0; | |
5406 | mddev->metadata_type[0] = 0; | |
5407 | mddev->chunk_sectors = 0; | |
5408 | mddev->ctime = mddev->utime = 0; | |
5409 | mddev->layout = 0; | |
5410 | mddev->max_disks = 0; | |
5411 | mddev->events = 0; | |
a8707c08 | 5412 | mddev->can_decrease_events = 0; |
6177b472 | 5413 | mddev->delta_disks = 0; |
2c810cdd | 5414 | mddev->reshape_backwards = 0; |
6177b472 N |
5415 | mddev->new_level = LEVEL_NONE; |
5416 | mddev->new_layout = 0; | |
5417 | mddev->new_chunk_sectors = 0; | |
5418 | mddev->curr_resync = 0; | |
7f7583d4 | 5419 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5420 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5421 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5422 | mddev->recovery = 0; | |
5423 | mddev->in_sync = 0; | |
f0b4f7e2 | 5424 | mddev->changed = 0; |
6177b472 | 5425 | mddev->degraded = 0; |
6177b472 | 5426 | mddev->safemode = 0; |
bd691922 | 5427 | mddev->private = NULL; |
6177b472 N |
5428 | mddev->bitmap_info.offset = 0; |
5429 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5430 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5431 | mddev->bitmap_info.chunksize = 0; |
5432 | mddev->bitmap_info.daemon_sleep = 0; | |
5433 | mddev->bitmap_info.max_write_behind = 0; | |
5434 | } | |
5435 | ||
fd01b88c | 5436 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5437 | { |
6b6204ee | 5438 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5439 | flush_workqueue(md_misc_wq); |
a047e125 | 5440 | if (mddev->sync_thread) { |
a047e125 | 5441 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5442 | md_reap_sync_thread(mddev); |
a047e125 N |
5443 | } |
5444 | ||
5445 | del_timer_sync(&mddev->safemode_timer); | |
5446 | ||
5447 | bitmap_flush(mddev); | |
5448 | md_super_wait(mddev); | |
5449 | ||
b6d428c6 | 5450 | if (mddev->ro == 0 && |
28c1b9fd GR |
5451 | ((!mddev->in_sync && !mddev_is_clustered(mddev)) || |
5452 | (mddev->flags & MD_UPDATE_SB_FLAGS))) { | |
a047e125 | 5453 | /* mark array as shutdown cleanly */ |
28c1b9fd GR |
5454 | if (!mddev_is_clustered(mddev)) |
5455 | mddev->in_sync = 1; | |
a047e125 N |
5456 | md_update_sb(mddev, 1); |
5457 | } | |
5458 | } | |
defad61a | 5459 | |
fd01b88c | 5460 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5461 | { |
29f097c4 | 5462 | mddev_lock_nointr(mddev); |
defad61a N |
5463 | __md_stop_writes(mddev); |
5464 | mddev_unlock(mddev); | |
5465 | } | |
390ee602 | 5466 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5467 | |
5aa61f42 N |
5468 | static void mddev_detach(struct mddev *mddev) |
5469 | { | |
5470 | struct bitmap *bitmap = mddev->bitmap; | |
5471 | /* wait for behind writes to complete */ | |
5472 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
5473 | printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n", | |
5474 | mdname(mddev)); | |
5475 | /* need to kick something here to make sure I/O goes? */ | |
5476 | wait_event(bitmap->behind_wait, | |
5477 | atomic_read(&bitmap->behind_writes) == 0); | |
5478 | } | |
36d091f4 | 5479 | if (mddev->pers && mddev->pers->quiesce) { |
5aa61f42 N |
5480 | mddev->pers->quiesce(mddev, 1); |
5481 | mddev->pers->quiesce(mddev, 0); | |
5482 | } | |
5483 | md_unregister_thread(&mddev->thread); | |
5484 | if (mddev->queue) | |
5485 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
5486 | } | |
5487 | ||
5eff3c43 | 5488 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5489 | { |
36d091f4 | 5490 | struct md_personality *pers = mddev->pers; |
5aa61f42 | 5491 | mddev_detach(mddev); |
ee5d004f N |
5492 | /* Ensure ->event_work is done */ |
5493 | flush_workqueue(md_misc_wq); | |
36d091f4 N |
5494 | spin_lock(&mddev->lock); |
5495 | mddev->ready = 0; | |
6177b472 | 5496 | mddev->pers = NULL; |
36d091f4 N |
5497 | spin_unlock(&mddev->lock); |
5498 | pers->free(mddev, mddev->private); | |
bd691922 | 5499 | mddev->private = NULL; |
36d091f4 N |
5500 | if (pers->sync_request && mddev->to_remove == NULL) |
5501 | mddev->to_remove = &md_redundancy_group; | |
5502 | module_put(pers->owner); | |
cca9cf90 | 5503 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5504 | } |
5eff3c43 N |
5505 | |
5506 | void md_stop(struct mddev *mddev) | |
5507 | { | |
5508 | /* stop the array and free an attached data structures. | |
5509 | * This is called from dm-raid | |
5510 | */ | |
5511 | __md_stop(mddev); | |
5512 | bitmap_destroy(mddev); | |
5513 | if (mddev->bio_set) | |
5514 | bioset_free(mddev->bio_set); | |
5515 | } | |
5516 | ||
390ee602 | 5517 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5518 | |
a05b7ea0 | 5519 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5520 | { |
5521 | int err = 0; | |
30b8feb7 N |
5522 | int did_freeze = 0; |
5523 | ||
5524 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5525 | did_freeze = 1; | |
5526 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5527 | md_wakeup_thread(mddev->thread); | |
5528 | } | |
f851b60d | 5529 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5530 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5531 | if (mddev->sync_thread) |
30b8feb7 N |
5532 | /* Thread might be blocked waiting for metadata update |
5533 | * which will now never happen */ | |
5534 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5535 | |
88724bfa N |
5536 | if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
5537 | return -EBUSY; | |
30b8feb7 | 5538 | mddev_unlock(mddev); |
f851b60d N |
5539 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5540 | &mddev->recovery)); | |
88724bfa N |
5541 | wait_event(mddev->sb_wait, |
5542 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
30b8feb7 N |
5543 | mddev_lock_nointr(mddev); |
5544 | ||
a4bd82d0 | 5545 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5546 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5547 | mddev->sync_thread || |
f851b60d | 5548 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5549 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
a4bd82d0 | 5550 | printk("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5551 | if (did_freeze) { |
5552 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5553 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5554 | md_wakeup_thread(mddev->thread); |
5555 | } | |
a4bd82d0 N |
5556 | err = -EBUSY; |
5557 | goto out; | |
5558 | } | |
5559 | if (mddev->pers) { | |
defad61a | 5560 | __md_stop_writes(mddev); |
a4bd82d0 N |
5561 | |
5562 | err = -ENXIO; | |
5563 | if (mddev->ro==1) | |
5564 | goto out; | |
5565 | mddev->ro = 1; | |
5566 | set_disk_ro(mddev->gendisk, 1); | |
5567 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5568 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5569 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5570 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5571 | err = 0; |
a4bd82d0 N |
5572 | } |
5573 | out: | |
5574 | mutex_unlock(&mddev->open_mutex); | |
5575 | return err; | |
5576 | } | |
5577 | ||
9e653b63 N |
5578 | /* mode: |
5579 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5580 | * 2 - stop but do not disassemble array |
5581 | */ | |
f72ffdd6 | 5582 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5583 | struct block_device *bdev) |
1da177e4 | 5584 | { |
1da177e4 | 5585 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5586 | struct md_rdev *rdev; |
30b8feb7 N |
5587 | int did_freeze = 0; |
5588 | ||
5589 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5590 | did_freeze = 1; | |
5591 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5592 | md_wakeup_thread(mddev->thread); | |
5593 | } | |
f851b60d | 5594 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5595 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5596 | if (mddev->sync_thread) |
30b8feb7 N |
5597 | /* Thread might be blocked waiting for metadata update |
5598 | * which will now never happen */ | |
5599 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5600 | |
30b8feb7 | 5601 | mddev_unlock(mddev); |
f851b60d N |
5602 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5603 | !test_bit(MD_RECOVERY_RUNNING, | |
5604 | &mddev->recovery))); | |
30b8feb7 | 5605 | mddev_lock_nointr(mddev); |
1da177e4 | 5606 | |
c8c00a69 | 5607 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5608 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5609 | mddev->sysfs_active || |
5610 | mddev->sync_thread || | |
f851b60d | 5611 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5612 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
df5b20cf | 5613 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5614 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5615 | if (did_freeze) { |
5616 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5617 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5618 | md_wakeup_thread(mddev->thread); |
5619 | } | |
260fa034 N |
5620 | return -EBUSY; |
5621 | } | |
6e17b027 | 5622 | if (mddev->pers) { |
a4bd82d0 N |
5623 | if (mddev->ro) |
5624 | set_disk_ro(disk, 0); | |
409c57f3 | 5625 | |
defad61a | 5626 | __md_stop_writes(mddev); |
5eff3c43 | 5627 | __md_stop(mddev); |
a4bd82d0 | 5628 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5629 | |
a4bd82d0 | 5630 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5631 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5632 | |
dafb20fa | 5633 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5634 | if (rdev->raid_disk >= 0) |
5635 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5636 | |
a4bd82d0 | 5637 | set_capacity(disk, 0); |
6e17b027 | 5638 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5639 | mddev->changed = 1; |
a4bd82d0 | 5640 | revalidate_disk(disk); |
0d4ca600 | 5641 | |
a4bd82d0 N |
5642 | if (mddev->ro) |
5643 | mddev->ro = 0; | |
6e17b027 N |
5644 | } else |
5645 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5646 | /* |
5647 | * Free resources if final stop | |
5648 | */ | |
9e653b63 | 5649 | if (mode == 0) { |
1da177e4 LT |
5650 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5651 | ||
978f946b | 5652 | bitmap_destroy(mddev); |
c3d9714e | 5653 | if (mddev->bitmap_info.file) { |
4af1a041 N |
5654 | struct file *f = mddev->bitmap_info.file; |
5655 | spin_lock(&mddev->lock); | |
c3d9714e | 5656 | mddev->bitmap_info.file = NULL; |
4af1a041 N |
5657 | spin_unlock(&mddev->lock); |
5658 | fput(f); | |
978f946b | 5659 | } |
c3d9714e | 5660 | mddev->bitmap_info.offset = 0; |
978f946b | 5661 | |
1da177e4 LT |
5662 | export_array(mddev); |
5663 | ||
6177b472 | 5664 | md_clean(mddev); |
934d9c23 | 5665 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5666 | if (mddev->hold_active == UNTIL_STOP) |
5667 | mddev->hold_active = 0; | |
a4bd82d0 | 5668 | } |
d7603b7e | 5669 | md_new_event(mddev); |
00bcb4ac | 5670 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5671 | return 0; |
1da177e4 LT |
5672 | } |
5673 | ||
fdee8ae4 | 5674 | #ifndef MODULE |
fd01b88c | 5675 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5676 | { |
3cb03002 | 5677 | struct md_rdev *rdev; |
1da177e4 LT |
5678 | int err; |
5679 | ||
a757e64c | 5680 | if (list_empty(&mddev->disks)) |
1da177e4 | 5681 | return; |
1da177e4 LT |
5682 | |
5683 | printk(KERN_INFO "md: running: "); | |
5684 | ||
dafb20fa | 5685 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5686 | char b[BDEVNAME_SIZE]; |
5687 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5688 | } | |
5689 | printk("\n"); | |
5690 | ||
d710e138 | 5691 | err = do_md_run(mddev); |
1da177e4 LT |
5692 | if (err) { |
5693 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5694 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5695 | } |
5696 | } | |
5697 | ||
5698 | /* | |
5699 | * lets try to run arrays based on all disks that have arrived | |
5700 | * until now. (those are in pending_raid_disks) | |
5701 | * | |
5702 | * the method: pick the first pending disk, collect all disks with | |
5703 | * the same UUID, remove all from the pending list and put them into | |
5704 | * the 'same_array' list. Then order this list based on superblock | |
5705 | * update time (freshest comes first), kick out 'old' disks and | |
5706 | * compare superblocks. If everything's fine then run it. | |
5707 | * | |
5708 | * If "unit" is allocated, then bump its reference count | |
5709 | */ | |
5710 | static void autorun_devices(int part) | |
5711 | { | |
3cb03002 | 5712 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5713 | struct mddev *mddev; |
1da177e4 LT |
5714 | char b[BDEVNAME_SIZE]; |
5715 | ||
5716 | printk(KERN_INFO "md: autorun ...\n"); | |
5717 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5718 | int unit; |
1da177e4 | 5719 | dev_t dev; |
ad01c9e3 | 5720 | LIST_HEAD(candidates); |
1da177e4 | 5721 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5722 | struct md_rdev, same_set); |
1da177e4 LT |
5723 | |
5724 | printk(KERN_INFO "md: considering %s ...\n", | |
5725 | bdevname(rdev0->bdev,b)); | |
5726 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5727 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5728 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5729 | printk(KERN_INFO "md: adding %s ...\n", | |
5730 | bdevname(rdev->bdev,b)); | |
5731 | list_move(&rdev->same_set, &candidates); | |
5732 | } | |
5733 | /* | |
5734 | * now we have a set of devices, with all of them having | |
5735 | * mostly sane superblocks. It's time to allocate the | |
5736 | * mddev. | |
5737 | */ | |
e8703fe1 N |
5738 | if (part) { |
5739 | dev = MKDEV(mdp_major, | |
5740 | rdev0->preferred_minor << MdpMinorShift); | |
5741 | unit = MINOR(dev) >> MdpMinorShift; | |
5742 | } else { | |
5743 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5744 | unit = MINOR(dev); | |
5745 | } | |
5746 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5747 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5748 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5749 | break; | |
5750 | } | |
1da177e4 LT |
5751 | |
5752 | md_probe(dev, NULL, NULL); | |
5753 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5754 | if (!mddev || !mddev->gendisk) { |
5755 | if (mddev) | |
5756 | mddev_put(mddev); | |
5757 | printk(KERN_ERR | |
1da177e4 LT |
5758 | "md: cannot allocate memory for md drive.\n"); |
5759 | break; | |
5760 | } | |
f72ffdd6 | 5761 | if (mddev_lock(mddev)) |
1da177e4 LT |
5762 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
5763 | mdname(mddev)); | |
5764 | else if (mddev->raid_disks || mddev->major_version | |
5765 | || !list_empty(&mddev->disks)) { | |
f72ffdd6 | 5766 | printk(KERN_WARNING |
1da177e4 LT |
5767 | "md: %s already running, cannot run %s\n", |
5768 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5769 | mddev_unlock(mddev); | |
5770 | } else { | |
5771 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5772 | mddev->persistent = 1; |
159ec1fc | 5773 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5774 | list_del_init(&rdev->same_set); |
5775 | if (bind_rdev_to_array(rdev, mddev)) | |
5776 | export_rdev(rdev); | |
5777 | } | |
5778 | autorun_array(mddev); | |
5779 | mddev_unlock(mddev); | |
5780 | } | |
5781 | /* on success, candidates will be empty, on error | |
5782 | * it won't... | |
5783 | */ | |
159ec1fc | 5784 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5785 | list_del_init(&rdev->same_set); |
1da177e4 | 5786 | export_rdev(rdev); |
4b80991c | 5787 | } |
1da177e4 LT |
5788 | mddev_put(mddev); |
5789 | } | |
5790 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5791 | } | |
fdee8ae4 | 5792 | #endif /* !MODULE */ |
1da177e4 | 5793 | |
f72ffdd6 | 5794 | static int get_version(void __user *arg) |
1da177e4 LT |
5795 | { |
5796 | mdu_version_t ver; | |
5797 | ||
5798 | ver.major = MD_MAJOR_VERSION; | |
5799 | ver.minor = MD_MINOR_VERSION; | |
5800 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5801 | ||
5802 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5803 | return -EFAULT; | |
5804 | ||
5805 | return 0; | |
5806 | } | |
5807 | ||
f72ffdd6 | 5808 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
5809 | { |
5810 | mdu_array_info_t info; | |
a9f326eb | 5811 | int nr,working,insync,failed,spare; |
3cb03002 | 5812 | struct md_rdev *rdev; |
1da177e4 | 5813 | |
1ca69c4b N |
5814 | nr = working = insync = failed = spare = 0; |
5815 | rcu_read_lock(); | |
5816 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5817 | nr++; |
b2d444d7 | 5818 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5819 | failed++; |
5820 | else { | |
5821 | working++; | |
b2d444d7 | 5822 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 5823 | insync++; |
1da177e4 LT |
5824 | else |
5825 | spare++; | |
5826 | } | |
5827 | } | |
1ca69c4b | 5828 | rcu_read_unlock(); |
1da177e4 LT |
5829 | |
5830 | info.major_version = mddev->major_version; | |
5831 | info.minor_version = mddev->minor_version; | |
5832 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5833 | info.ctime = mddev->ctime; | |
5834 | info.level = mddev->level; | |
58c0fed4 AN |
5835 | info.size = mddev->dev_sectors / 2; |
5836 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5837 | info.size = -1; |
1da177e4 LT |
5838 | info.nr_disks = nr; |
5839 | info.raid_disks = mddev->raid_disks; | |
5840 | info.md_minor = mddev->md_minor; | |
5841 | info.not_persistent= !mddev->persistent; | |
5842 | ||
5843 | info.utime = mddev->utime; | |
5844 | info.state = 0; | |
5845 | if (mddev->in_sync) | |
5846 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5847 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 5848 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
ca8895d9 GR |
5849 | if (mddev_is_clustered(mddev)) |
5850 | info.state |= (1<<MD_SB_CLUSTERED); | |
a9f326eb | 5851 | info.active_disks = insync; |
1da177e4 LT |
5852 | info.working_disks = working; |
5853 | info.failed_disks = failed; | |
5854 | info.spare_disks = spare; | |
5855 | ||
5856 | info.layout = mddev->layout; | |
9d8f0363 | 5857 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5858 | |
5859 | if (copy_to_user(arg, &info, sizeof(info))) | |
5860 | return -EFAULT; | |
5861 | ||
5862 | return 0; | |
5863 | } | |
5864 | ||
f72ffdd6 | 5865 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
5866 | { |
5867 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
f4ad3d38 | 5868 | char *ptr; |
4af1a041 | 5869 | int err; |
32a7627c | 5870 | |
b6878d9e | 5871 | file = kzalloc(sizeof(*file), GFP_NOIO); |
32a7627c | 5872 | if (!file) |
4af1a041 | 5873 | return -ENOMEM; |
32a7627c | 5874 | |
4af1a041 N |
5875 | err = 0; |
5876 | spin_lock(&mddev->lock); | |
25eafe1a BR |
5877 | /* bitmap enabled */ |
5878 | if (mddev->bitmap_info.file) { | |
5879 | ptr = file_path(mddev->bitmap_info.file, file->pathname, | |
5880 | sizeof(file->pathname)); | |
5881 | if (IS_ERR(ptr)) | |
5882 | err = PTR_ERR(ptr); | |
5883 | else | |
5884 | memmove(file->pathname, ptr, | |
5885 | sizeof(file->pathname)-(ptr-file->pathname)); | |
5886 | } | |
4af1a041 | 5887 | spin_unlock(&mddev->lock); |
32a7627c | 5888 | |
4af1a041 N |
5889 | if (err == 0 && |
5890 | copy_to_user(arg, file, sizeof(*file))) | |
32a7627c | 5891 | err = -EFAULT; |
4af1a041 | 5892 | |
32a7627c N |
5893 | kfree(file); |
5894 | return err; | |
5895 | } | |
5896 | ||
f72ffdd6 | 5897 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
5898 | { |
5899 | mdu_disk_info_t info; | |
3cb03002 | 5900 | struct md_rdev *rdev; |
1da177e4 LT |
5901 | |
5902 | if (copy_from_user(&info, arg, sizeof(info))) | |
5903 | return -EFAULT; | |
5904 | ||
1ca69c4b | 5905 | rcu_read_lock(); |
57d051dc | 5906 | rdev = md_find_rdev_nr_rcu(mddev, info.number); |
1da177e4 LT |
5907 | if (rdev) { |
5908 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5909 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5910 | info.raid_disk = rdev->raid_disk; | |
5911 | info.state = 0; | |
b2d444d7 | 5912 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5913 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5914 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5915 | info.state |= (1<<MD_DISK_ACTIVE); |
5916 | info.state |= (1<<MD_DISK_SYNC); | |
5917 | } | |
9efdca16 | 5918 | if (test_bit(Journal, &rdev->flags)) |
bac624f3 | 5919 | info.state |= (1<<MD_DISK_JOURNAL); |
8ddf9efe N |
5920 | if (test_bit(WriteMostly, &rdev->flags)) |
5921 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5922 | } else { |
5923 | info.major = info.minor = 0; | |
5924 | info.raid_disk = -1; | |
5925 | info.state = (1<<MD_DISK_REMOVED); | |
5926 | } | |
1ca69c4b | 5927 | rcu_read_unlock(); |
1da177e4 LT |
5928 | |
5929 | if (copy_to_user(arg, &info, sizeof(info))) | |
5930 | return -EFAULT; | |
5931 | ||
5932 | return 0; | |
5933 | } | |
5934 | ||
f72ffdd6 | 5935 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5936 | { |
5937 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5938 | struct md_rdev *rdev; |
1da177e4 LT |
5939 | dev_t dev = MKDEV(info->major,info->minor); |
5940 | ||
1aee41f6 GR |
5941 | if (mddev_is_clustered(mddev) && |
5942 | !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { | |
fa8259da | 5943 | pr_err("%s: Cannot add to clustered mddev.\n", |
1aee41f6 GR |
5944 | mdname(mddev)); |
5945 | return -EINVAL; | |
5946 | } | |
5947 | ||
1da177e4 LT |
5948 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) |
5949 | return -EOVERFLOW; | |
5950 | ||
5951 | if (!mddev->raid_disks) { | |
5952 | int err; | |
5953 | /* expecting a device which has a superblock */ | |
5954 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5955 | if (IS_ERR(rdev)) { | |
f72ffdd6 | 5956 | printk(KERN_WARNING |
1da177e4 LT |
5957 | "md: md_import_device returned %ld\n", |
5958 | PTR_ERR(rdev)); | |
5959 | return PTR_ERR(rdev); | |
5960 | } | |
5961 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5962 | struct md_rdev *rdev0 |
5963 | = list_entry(mddev->disks.next, | |
5964 | struct md_rdev, same_set); | |
a9f326eb | 5965 | err = super_types[mddev->major_version] |
1da177e4 LT |
5966 | .load_super(rdev, rdev0, mddev->minor_version); |
5967 | if (err < 0) { | |
f72ffdd6 | 5968 | printk(KERN_WARNING |
1da177e4 | 5969 | "md: %s has different UUID to %s\n", |
f72ffdd6 | 5970 | bdevname(rdev->bdev,b), |
1da177e4 LT |
5971 | bdevname(rdev0->bdev,b2)); |
5972 | export_rdev(rdev); | |
5973 | return -EINVAL; | |
5974 | } | |
5975 | } | |
5976 | err = bind_rdev_to_array(rdev, mddev); | |
5977 | if (err) | |
5978 | export_rdev(rdev); | |
5979 | return err; | |
5980 | } | |
5981 | ||
5982 | /* | |
5983 | * add_new_disk can be used once the array is assembled | |
5984 | * to add "hot spares". They must already have a superblock | |
5985 | * written | |
5986 | */ | |
5987 | if (mddev->pers) { | |
5988 | int err; | |
5989 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5990 | printk(KERN_WARNING |
1da177e4 LT |
5991 | "%s: personality does not support diskops!\n", |
5992 | mdname(mddev)); | |
5993 | return -EINVAL; | |
5994 | } | |
7b1e35f6 N |
5995 | if (mddev->persistent) |
5996 | rdev = md_import_device(dev, mddev->major_version, | |
5997 | mddev->minor_version); | |
5998 | else | |
5999 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 6000 | if (IS_ERR(rdev)) { |
f72ffdd6 | 6001 | printk(KERN_WARNING |
1da177e4 LT |
6002 | "md: md_import_device returned %ld\n", |
6003 | PTR_ERR(rdev)); | |
6004 | return PTR_ERR(rdev); | |
6005 | } | |
1a855a06 | 6006 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
6007 | if (!mddev->persistent) { |
6008 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 6009 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 6010 | rdev->raid_disk = info->raid_disk; |
bf572541 | 6011 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 6012 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 6013 | } else |
41158c7e | 6014 | rdev->raid_disk = -1; |
f466722c | 6015 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
6016 | } else |
6017 | super_types[mddev->major_version]. | |
6018 | validate_super(mddev, rdev); | |
bedd86b7 | 6019 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 6020 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
6021 | /* This was a hot-add request, but events doesn't |
6022 | * match, so reject it. | |
6023 | */ | |
6024 | export_rdev(rdev); | |
6025 | return -EINVAL; | |
6026 | } | |
6027 | ||
b2d444d7 | 6028 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
6029 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
6030 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
6031 | else |
6032 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 6033 | |
bac624f3 SL |
6034 | if (info->state & (1<<MD_DISK_JOURNAL)) |
6035 | set_bit(Journal, &rdev->flags); | |
1aee41f6 GR |
6036 | /* |
6037 | * check whether the device shows up in other nodes | |
6038 | */ | |
6039 | if (mddev_is_clustered(mddev)) { | |
dbb64f86 | 6040 | if (info->state & (1 << MD_DISK_CANDIDATE)) |
1aee41f6 | 6041 | set_bit(Candidate, &rdev->flags); |
dbb64f86 | 6042 | else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { |
1aee41f6 | 6043 | /* --add initiated by this node */ |
dbb64f86 | 6044 | err = md_cluster_ops->add_new_disk(mddev, rdev); |
1aee41f6 | 6045 | if (err) { |
1aee41f6 GR |
6046 | export_rdev(rdev); |
6047 | return err; | |
6048 | } | |
6049 | } | |
6050 | } | |
6051 | ||
1da177e4 LT |
6052 | rdev->raid_disk = -1; |
6053 | err = bind_rdev_to_array(rdev, mddev); | |
dbb64f86 | 6054 | |
1da177e4 LT |
6055 | if (err) |
6056 | export_rdev(rdev); | |
dbb64f86 GR |
6057 | |
6058 | if (mddev_is_clustered(mddev)) { | |
6059 | if (info->state & (1 << MD_DISK_CANDIDATE)) | |
6060 | md_cluster_ops->new_disk_ack(mddev, (err == 0)); | |
6061 | else { | |
6062 | if (err) | |
6063 | md_cluster_ops->add_new_disk_cancel(mddev); | |
6064 | else | |
6065 | err = add_bound_rdev(rdev); | |
6066 | } | |
6067 | ||
6068 | } else if (!err) | |
a6da4ef8 | 6069 | err = add_bound_rdev(rdev); |
dbb64f86 | 6070 | |
1da177e4 LT |
6071 | return err; |
6072 | } | |
6073 | ||
6074 | /* otherwise, add_new_disk is only allowed | |
6075 | * for major_version==0 superblocks | |
6076 | */ | |
6077 | if (mddev->major_version != 0) { | |
6078 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
6079 | mdname(mddev)); | |
6080 | return -EINVAL; | |
6081 | } | |
6082 | ||
6083 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
6084 | int err; | |
d710e138 | 6085 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 6086 | if (IS_ERR(rdev)) { |
f72ffdd6 | 6087 | printk(KERN_WARNING |
1da177e4 LT |
6088 | "md: error, md_import_device() returned %ld\n", |
6089 | PTR_ERR(rdev)); | |
6090 | return PTR_ERR(rdev); | |
6091 | } | |
6092 | rdev->desc_nr = info->number; | |
6093 | if (info->raid_disk < mddev->raid_disks) | |
6094 | rdev->raid_disk = info->raid_disk; | |
6095 | else | |
6096 | rdev->raid_disk = -1; | |
6097 | ||
1da177e4 | 6098 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
6099 | if (info->state & (1<<MD_DISK_SYNC)) |
6100 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 6101 | |
8ddf9efe N |
6102 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
6103 | set_bit(WriteMostly, &rdev->flags); | |
6104 | ||
1da177e4 LT |
6105 | if (!mddev->persistent) { |
6106 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
6107 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
6108 | } else | |
57b2caa3 | 6109 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 6110 | rdev->sectors = rdev->sb_start; |
1da177e4 | 6111 | |
2bf071bf N |
6112 | err = bind_rdev_to_array(rdev, mddev); |
6113 | if (err) { | |
6114 | export_rdev(rdev); | |
6115 | return err; | |
6116 | } | |
1da177e4 LT |
6117 | } |
6118 | ||
6119 | return 0; | |
6120 | } | |
6121 | ||
f72ffdd6 | 6122 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
6123 | { |
6124 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 6125 | struct md_rdev *rdev; |
23b63f9f | 6126 | int ret = -1; |
1da177e4 | 6127 | |
1da177e4 LT |
6128 | rdev = find_rdev(mddev, dev); |
6129 | if (!rdev) | |
6130 | return -ENXIO; | |
6131 | ||
293467aa | 6132 | if (mddev_is_clustered(mddev)) |
23b63f9f | 6133 | ret = md_cluster_ops->metadata_update_start(mddev); |
293467aa | 6134 | |
2910ff17 GR |
6135 | if (rdev->raid_disk < 0) |
6136 | goto kick_rdev; | |
293467aa | 6137 | |
3ea8929d N |
6138 | clear_bit(Blocked, &rdev->flags); |
6139 | remove_and_add_spares(mddev, rdev); | |
6140 | ||
1da177e4 LT |
6141 | if (rdev->raid_disk >= 0) |
6142 | goto busy; | |
6143 | ||
2910ff17 | 6144 | kick_rdev: |
23b63f9f | 6145 | if (mddev_is_clustered(mddev) && ret == 0) |
88bcfef7 GR |
6146 | md_cluster_ops->remove_disk(mddev, rdev); |
6147 | ||
fb56dfef | 6148 | md_kick_rdev_from_array(rdev); |
850b2b42 | 6149 | md_update_sb(mddev, 1); |
d7603b7e | 6150 | md_new_event(mddev); |
1da177e4 LT |
6151 | |
6152 | return 0; | |
6153 | busy: | |
23b63f9f | 6154 | if (mddev_is_clustered(mddev) && ret == 0) |
293467aa | 6155 | md_cluster_ops->metadata_update_cancel(mddev); |
2910ff17 | 6156 | |
fdefa4d8 | 6157 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
6158 | bdevname(rdev->bdev,b), mdname(mddev)); |
6159 | return -EBUSY; | |
6160 | } | |
6161 | ||
f72ffdd6 | 6162 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
6163 | { |
6164 | char b[BDEVNAME_SIZE]; | |
6165 | int err; | |
3cb03002 | 6166 | struct md_rdev *rdev; |
1da177e4 LT |
6167 | |
6168 | if (!mddev->pers) | |
6169 | return -ENODEV; | |
6170 | ||
6171 | if (mddev->major_version != 0) { | |
6172 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
6173 | " version-0 superblocks.\n", | |
6174 | mdname(mddev)); | |
6175 | return -EINVAL; | |
6176 | } | |
6177 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 6178 | printk(KERN_WARNING |
1da177e4 LT |
6179 | "%s: personality does not support diskops!\n", |
6180 | mdname(mddev)); | |
6181 | return -EINVAL; | |
6182 | } | |
6183 | ||
d710e138 | 6184 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 6185 | if (IS_ERR(rdev)) { |
f72ffdd6 | 6186 | printk(KERN_WARNING |
1da177e4 LT |
6187 | "md: error, md_import_device() returned %ld\n", |
6188 | PTR_ERR(rdev)); | |
6189 | return -EINVAL; | |
6190 | } | |
6191 | ||
6192 | if (mddev->persistent) | |
57b2caa3 | 6193 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 6194 | else |
77304d2a | 6195 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 6196 | |
8190e754 | 6197 | rdev->sectors = rdev->sb_start; |
1da177e4 | 6198 | |
b2d444d7 | 6199 | if (test_bit(Faulty, &rdev->flags)) { |
f72ffdd6 | 6200 | printk(KERN_WARNING |
1da177e4 LT |
6201 | "md: can not hot-add faulty %s disk to %s!\n", |
6202 | bdevname(rdev->bdev,b), mdname(mddev)); | |
6203 | err = -EINVAL; | |
6204 | goto abort_export; | |
6205 | } | |
293467aa | 6206 | |
b2d444d7 | 6207 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 6208 | rdev->desc_nr = -1; |
5842730d | 6209 | rdev->saved_raid_disk = -1; |
2bf071bf N |
6210 | err = bind_rdev_to_array(rdev, mddev); |
6211 | if (err) | |
2aa82191 | 6212 | goto abort_export; |
1da177e4 LT |
6213 | |
6214 | /* | |
6215 | * The rest should better be atomic, we can have disk failures | |
6216 | * noticed in interrupt contexts ... | |
6217 | */ | |
6218 | ||
1da177e4 LT |
6219 | rdev->raid_disk = -1; |
6220 | ||
850b2b42 | 6221 | md_update_sb(mddev, 1); |
1da177e4 LT |
6222 | /* |
6223 | * Kick recovery, maybe this spare has to be added to the | |
6224 | * array immediately. | |
6225 | */ | |
6226 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6227 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 6228 | md_new_event(mddev); |
1da177e4 LT |
6229 | return 0; |
6230 | ||
1da177e4 LT |
6231 | abort_export: |
6232 | export_rdev(rdev); | |
6233 | return err; | |
6234 | } | |
6235 | ||
fd01b88c | 6236 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 6237 | { |
035328c2 | 6238 | int err = 0; |
32a7627c | 6239 | |
36fa3063 | 6240 | if (mddev->pers) { |
d66b1b39 | 6241 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
6242 | return -EBUSY; |
6243 | if (mddev->recovery || mddev->sync_thread) | |
6244 | return -EBUSY; | |
6245 | /* we should be able to change the bitmap.. */ | |
6246 | } | |
32a7627c | 6247 | |
36fa3063 | 6248 | if (fd >= 0) { |
035328c2 | 6249 | struct inode *inode; |
1e594bb2 N |
6250 | struct file *f; |
6251 | ||
6252 | if (mddev->bitmap || mddev->bitmap_info.file) | |
36fa3063 | 6253 | return -EEXIST; /* cannot add when bitmap is present */ |
1e594bb2 | 6254 | f = fget(fd); |
32a7627c | 6255 | |
1e594bb2 | 6256 | if (f == NULL) { |
36fa3063 N |
6257 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
6258 | mdname(mddev)); | |
6259 | return -EBADF; | |
6260 | } | |
6261 | ||
1e594bb2 | 6262 | inode = f->f_mapping->host; |
035328c2 N |
6263 | if (!S_ISREG(inode->i_mode)) { |
6264 | printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", | |
6265 | mdname(mddev)); | |
6266 | err = -EBADF; | |
1e594bb2 | 6267 | } else if (!(f->f_mode & FMODE_WRITE)) { |
035328c2 N |
6268 | printk(KERN_ERR "%s: error: bitmap file must open for write\n", |
6269 | mdname(mddev)); | |
6270 | err = -EBADF; | |
6271 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
36fa3063 N |
6272 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
6273 | mdname(mddev)); | |
035328c2 N |
6274 | err = -EBUSY; |
6275 | } | |
6276 | if (err) { | |
1e594bb2 | 6277 | fput(f); |
36fa3063 N |
6278 | return err; |
6279 | } | |
1e594bb2 | 6280 | mddev->bitmap_info.file = f; |
c3d9714e | 6281 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
6282 | } else if (mddev->bitmap == NULL) |
6283 | return -ENOENT; /* cannot remove what isn't there */ | |
6284 | err = 0; | |
6285 | if (mddev->pers) { | |
6286 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 6287 | if (fd >= 0) { |
f9209a32 GR |
6288 | struct bitmap *bitmap; |
6289 | ||
6290 | bitmap = bitmap_create(mddev, -1); | |
6291 | if (!IS_ERR(bitmap)) { | |
6292 | mddev->bitmap = bitmap; | |
69e51b44 | 6293 | err = bitmap_load(mddev); |
ba599aca N |
6294 | } else |
6295 | err = PTR_ERR(bitmap); | |
69e51b44 | 6296 | } |
d7375ab3 | 6297 | if (fd < 0 || err) { |
36fa3063 | 6298 | bitmap_destroy(mddev); |
d7375ab3 N |
6299 | fd = -1; /* make sure to put the file */ |
6300 | } | |
36fa3063 | 6301 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
6302 | } |
6303 | if (fd < 0) { | |
4af1a041 N |
6304 | struct file *f = mddev->bitmap_info.file; |
6305 | if (f) { | |
6306 | spin_lock(&mddev->lock); | |
6307 | mddev->bitmap_info.file = NULL; | |
6308 | spin_unlock(&mddev->lock); | |
6309 | fput(f); | |
6310 | } | |
36fa3063 N |
6311 | } |
6312 | ||
32a7627c N |
6313 | return err; |
6314 | } | |
6315 | ||
1da177e4 LT |
6316 | /* |
6317 | * set_array_info is used two different ways | |
6318 | * The original usage is when creating a new array. | |
6319 | * In this usage, raid_disks is > 0 and it together with | |
6320 | * level, size, not_persistent,layout,chunksize determine the | |
6321 | * shape of the array. | |
6322 | * This will always create an array with a type-0.90.0 superblock. | |
6323 | * The newer usage is when assembling an array. | |
6324 | * In this case raid_disks will be 0, and the major_version field is | |
6325 | * use to determine which style super-blocks are to be found on the devices. | |
6326 | * The minor and patch _version numbers are also kept incase the | |
6327 | * super_block handler wishes to interpret them. | |
6328 | */ | |
f72ffdd6 | 6329 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6330 | { |
6331 | ||
6332 | if (info->raid_disks == 0) { | |
6333 | /* just setting version number for superblock loading */ | |
6334 | if (info->major_version < 0 || | |
50511da3 | 6335 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
6336 | super_types[info->major_version].name == NULL) { |
6337 | /* maybe try to auto-load a module? */ | |
f72ffdd6 | 6338 | printk(KERN_INFO |
1da177e4 LT |
6339 | "md: superblock version %d not known\n", |
6340 | info->major_version); | |
6341 | return -EINVAL; | |
6342 | } | |
6343 | mddev->major_version = info->major_version; | |
6344 | mddev->minor_version = info->minor_version; | |
6345 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 6346 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
6347 | /* ensure mddev_put doesn't delete this now that there |
6348 | * is some minimal configuration. | |
6349 | */ | |
6350 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
6351 | return 0; |
6352 | } | |
6353 | mddev->major_version = MD_MAJOR_VERSION; | |
6354 | mddev->minor_version = MD_MINOR_VERSION; | |
6355 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
6356 | mddev->ctime = get_seconds(); | |
6357 | ||
6358 | mddev->level = info->level; | |
17115e03 | 6359 | mddev->clevel[0] = 0; |
58c0fed4 | 6360 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
6361 | mddev->raid_disks = info->raid_disks; |
6362 | /* don't set md_minor, it is determined by which /dev/md* was | |
6363 | * openned | |
6364 | */ | |
6365 | if (info->state & (1<<MD_SB_CLEAN)) | |
6366 | mddev->recovery_cp = MaxSector; | |
6367 | else | |
6368 | mddev->recovery_cp = 0; | |
6369 | mddev->persistent = ! info->not_persistent; | |
e691063a | 6370 | mddev->external = 0; |
1da177e4 LT |
6371 | |
6372 | mddev->layout = info->layout; | |
9d8f0363 | 6373 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
6374 | |
6375 | mddev->max_disks = MD_SB_DISKS; | |
6376 | ||
e691063a N |
6377 | if (mddev->persistent) |
6378 | mddev->flags = 0; | |
850b2b42 | 6379 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6380 | |
c3d9714e | 6381 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 6382 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 6383 | mddev->bitmap_info.offset = 0; |
b2a2703c | 6384 | |
f6705578 N |
6385 | mddev->reshape_position = MaxSector; |
6386 | ||
1da177e4 LT |
6387 | /* |
6388 | * Generate a 128 bit UUID | |
6389 | */ | |
6390 | get_random_bytes(mddev->uuid, 16); | |
6391 | ||
f6705578 | 6392 | mddev->new_level = mddev->level; |
664e7c41 | 6393 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
6394 | mddev->new_layout = mddev->layout; |
6395 | mddev->delta_disks = 0; | |
2c810cdd | 6396 | mddev->reshape_backwards = 0; |
f6705578 | 6397 | |
1da177e4 LT |
6398 | return 0; |
6399 | } | |
6400 | ||
fd01b88c | 6401 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 6402 | { |
b522adcd DW |
6403 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
6404 | ||
6405 | if (mddev->external_size) | |
6406 | return; | |
6407 | ||
1f403624 DW |
6408 | mddev->array_sectors = array_sectors; |
6409 | } | |
6410 | EXPORT_SYMBOL(md_set_array_sectors); | |
6411 | ||
fd01b88c | 6412 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6413 | { |
3cb03002 | 6414 | struct md_rdev *rdev; |
a35b0d69 | 6415 | int rv; |
d71f9f88 | 6416 | int fit = (num_sectors == 0); |
a35b0d69 N |
6417 | |
6418 | if (mddev->pers->resize == NULL) | |
6419 | return -EINVAL; | |
d71f9f88 AN |
6420 | /* The "num_sectors" is the number of sectors of each device that |
6421 | * is used. This can only make sense for arrays with redundancy. | |
6422 | * linear and raid0 always use whatever space is available. We can only | |
6423 | * consider changing this number if no resync or reconstruction is | |
6424 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6425 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6426 | * of each device. If num_sectors is zero, we find the largest size |
6427 | * that fits. | |
a35b0d69 | 6428 | */ |
f851b60d N |
6429 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
6430 | mddev->sync_thread) | |
a35b0d69 | 6431 | return -EBUSY; |
bd8839e0 N |
6432 | if (mddev->ro) |
6433 | return -EROFS; | |
a4a6125a | 6434 | |
dafb20fa | 6435 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6436 | sector_t avail = rdev->sectors; |
01ab5662 | 6437 | |
d71f9f88 AN |
6438 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6439 | num_sectors = avail; | |
6440 | if (avail < num_sectors) | |
a35b0d69 N |
6441 | return -ENOSPC; |
6442 | } | |
d71f9f88 | 6443 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6444 | if (!rv) |
6445 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6446 | return rv; |
6447 | } | |
6448 | ||
fd01b88c | 6449 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6450 | { |
6451 | int rv; | |
c6563a8c | 6452 | struct md_rdev *rdev; |
da943b99 | 6453 | /* change the number of raid disks */ |
63c70c4f | 6454 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6455 | return -EINVAL; |
bd8839e0 N |
6456 | if (mddev->ro) |
6457 | return -EROFS; | |
da943b99 | 6458 | if (raid_disks <= 0 || |
233fca36 | 6459 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6460 | return -EINVAL; |
f851b60d N |
6461 | if (mddev->sync_thread || |
6462 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6463 | mddev->reshape_position != MaxSector) | |
da943b99 | 6464 | return -EBUSY; |
c6563a8c N |
6465 | |
6466 | rdev_for_each(rdev, mddev) { | |
6467 | if (mddev->raid_disks < raid_disks && | |
6468 | rdev->data_offset < rdev->new_data_offset) | |
6469 | return -EINVAL; | |
6470 | if (mddev->raid_disks > raid_disks && | |
6471 | rdev->data_offset > rdev->new_data_offset) | |
6472 | return -EINVAL; | |
6473 | } | |
6474 | ||
63c70c4f | 6475 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6476 | if (mddev->delta_disks < 0) |
6477 | mddev->reshape_backwards = 1; | |
6478 | else if (mddev->delta_disks > 0) | |
6479 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6480 | |
6481 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6482 | if (rv < 0) { |
de171cb9 | 6483 | mddev->delta_disks = 0; |
2c810cdd N |
6484 | mddev->reshape_backwards = 0; |
6485 | } | |
da943b99 N |
6486 | return rv; |
6487 | } | |
6488 | ||
1da177e4 LT |
6489 | /* |
6490 | * update_array_info is used to change the configuration of an | |
6491 | * on-line array. | |
6492 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6493 | * fields in the info are checked against the array. | |
6494 | * Any differences that cannot be handled will cause an error. | |
6495 | * Normally, only one change can be managed at a time. | |
6496 | */ | |
fd01b88c | 6497 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6498 | { |
6499 | int rv = 0; | |
6500 | int cnt = 0; | |
36fa3063 N |
6501 | int state = 0; |
6502 | ||
6503 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6504 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6505 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6506 | |
6507 | if (mddev->major_version != info->major_version || | |
6508 | mddev->minor_version != info->minor_version || | |
6509 | /* mddev->patch_version != info->patch_version || */ | |
6510 | mddev->ctime != info->ctime || | |
6511 | mddev->level != info->level || | |
6512 | /* mddev->layout != info->layout || */ | |
4e023612 | 6513 | mddev->persistent != !info->not_persistent || |
9d8f0363 | 6514 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6515 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6516 | ((state^info->state) & 0xfffffe00) | |
6517 | ) | |
1da177e4 LT |
6518 | return -EINVAL; |
6519 | /* Check there is only one change */ | |
58c0fed4 AN |
6520 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6521 | cnt++; | |
6522 | if (mddev->raid_disks != info->raid_disks) | |
6523 | cnt++; | |
6524 | if (mddev->layout != info->layout) | |
6525 | cnt++; | |
6526 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6527 | cnt++; | |
6528 | if (cnt == 0) | |
6529 | return 0; | |
6530 | if (cnt > 1) | |
6531 | return -EINVAL; | |
1da177e4 LT |
6532 | |
6533 | if (mddev->layout != info->layout) { | |
6534 | /* Change layout | |
6535 | * we don't need to do anything at the md level, the | |
6536 | * personality will take care of it all. | |
6537 | */ | |
50ac168a | 6538 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6539 | return -EINVAL; |
597a711b N |
6540 | else { |
6541 | mddev->new_layout = info->layout; | |
50ac168a | 6542 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6543 | if (rv) |
6544 | mddev->new_layout = mddev->layout; | |
6545 | return rv; | |
6546 | } | |
1da177e4 | 6547 | } |
58c0fed4 | 6548 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6549 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6550 | |
da943b99 N |
6551 | if (mddev->raid_disks != info->raid_disks) |
6552 | rv = update_raid_disks(mddev, info->raid_disks); | |
6553 | ||
36fa3063 | 6554 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
293467aa GR |
6555 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) { |
6556 | rv = -EINVAL; | |
6557 | goto err; | |
6558 | } | |
6559 | if (mddev->recovery || mddev->sync_thread) { | |
6560 | rv = -EBUSY; | |
6561 | goto err; | |
6562 | } | |
36fa3063 | 6563 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { |
f9209a32 | 6564 | struct bitmap *bitmap; |
36fa3063 | 6565 | /* add the bitmap */ |
293467aa GR |
6566 | if (mddev->bitmap) { |
6567 | rv = -EEXIST; | |
6568 | goto err; | |
6569 | } | |
6570 | if (mddev->bitmap_info.default_offset == 0) { | |
6571 | rv = -EINVAL; | |
6572 | goto err; | |
6573 | } | |
c3d9714e N |
6574 | mddev->bitmap_info.offset = |
6575 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6576 | mddev->bitmap_info.space = |
6577 | mddev->bitmap_info.default_space; | |
36fa3063 | 6578 | mddev->pers->quiesce(mddev, 1); |
f9209a32 GR |
6579 | bitmap = bitmap_create(mddev, -1); |
6580 | if (!IS_ERR(bitmap)) { | |
6581 | mddev->bitmap = bitmap; | |
69e51b44 | 6582 | rv = bitmap_load(mddev); |
ba599aca N |
6583 | } else |
6584 | rv = PTR_ERR(bitmap); | |
36fa3063 N |
6585 | if (rv) |
6586 | bitmap_destroy(mddev); | |
6587 | mddev->pers->quiesce(mddev, 0); | |
6588 | } else { | |
6589 | /* remove the bitmap */ | |
293467aa GR |
6590 | if (!mddev->bitmap) { |
6591 | rv = -ENOENT; | |
6592 | goto err; | |
6593 | } | |
6594 | if (mddev->bitmap->storage.file) { | |
6595 | rv = -EINVAL; | |
6596 | goto err; | |
6597 | } | |
36fa3063 N |
6598 | mddev->pers->quiesce(mddev, 1); |
6599 | bitmap_destroy(mddev); | |
6600 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6601 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6602 | } |
6603 | } | |
850b2b42 | 6604 | md_update_sb(mddev, 1); |
293467aa GR |
6605 | return rv; |
6606 | err: | |
1da177e4 LT |
6607 | return rv; |
6608 | } | |
6609 | ||
fd01b88c | 6610 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6611 | { |
3cb03002 | 6612 | struct md_rdev *rdev; |
1ca69c4b | 6613 | int err = 0; |
1da177e4 LT |
6614 | |
6615 | if (mddev->pers == NULL) | |
6616 | return -ENODEV; | |
6617 | ||
1ca69c4b N |
6618 | rcu_read_lock(); |
6619 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6620 | if (!rdev) |
1ca69c4b N |
6621 | err = -ENODEV; |
6622 | else { | |
6623 | md_error(mddev, rdev); | |
6624 | if (!test_bit(Faulty, &rdev->flags)) | |
6625 | err = -EBUSY; | |
6626 | } | |
6627 | rcu_read_unlock(); | |
6628 | return err; | |
1da177e4 LT |
6629 | } |
6630 | ||
2f9618ce AN |
6631 | /* |
6632 | * We have a problem here : there is no easy way to give a CHS | |
6633 | * virtual geometry. We currently pretend that we have a 2 heads | |
6634 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6635 | * dosfs just mad... ;-) | |
6636 | */ | |
a885c8c4 CH |
6637 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6638 | { | |
fd01b88c | 6639 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6640 | |
6641 | geo->heads = 2; | |
6642 | geo->sectors = 4; | |
49ce6cea | 6643 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6644 | return 0; |
6645 | } | |
6646 | ||
cb335f88 NS |
6647 | static inline bool md_ioctl_valid(unsigned int cmd) |
6648 | { | |
6649 | switch (cmd) { | |
6650 | case ADD_NEW_DISK: | |
6651 | case BLKROSET: | |
6652 | case GET_ARRAY_INFO: | |
6653 | case GET_BITMAP_FILE: | |
6654 | case GET_DISK_INFO: | |
6655 | case HOT_ADD_DISK: | |
6656 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
6657 | case RAID_AUTORUN: |
6658 | case RAID_VERSION: | |
6659 | case RESTART_ARRAY_RW: | |
6660 | case RUN_ARRAY: | |
6661 | case SET_ARRAY_INFO: | |
6662 | case SET_BITMAP_FILE: | |
6663 | case SET_DISK_FAULTY: | |
6664 | case STOP_ARRAY: | |
6665 | case STOP_ARRAY_RO: | |
1aee41f6 | 6666 | case CLUSTERED_DISK_NACK: |
cb335f88 NS |
6667 | return true; |
6668 | default: | |
6669 | return false; | |
6670 | } | |
6671 | } | |
6672 | ||
a39907fa | 6673 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6674 | unsigned int cmd, unsigned long arg) |
6675 | { | |
6676 | int err = 0; | |
6677 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6678 | struct mddev *mddev = NULL; |
e2218350 | 6679 | int ro; |
1da177e4 | 6680 | |
cb335f88 NS |
6681 | if (!md_ioctl_valid(cmd)) |
6682 | return -ENOTTY; | |
6683 | ||
506c9e44 N |
6684 | switch (cmd) { |
6685 | case RAID_VERSION: | |
6686 | case GET_ARRAY_INFO: | |
6687 | case GET_DISK_INFO: | |
6688 | break; | |
6689 | default: | |
6690 | if (!capable(CAP_SYS_ADMIN)) | |
6691 | return -EACCES; | |
6692 | } | |
1da177e4 LT |
6693 | |
6694 | /* | |
6695 | * Commands dealing with the RAID driver but not any | |
6696 | * particular array: | |
6697 | */ | |
c02c0aeb N |
6698 | switch (cmd) { |
6699 | case RAID_VERSION: | |
6700 | err = get_version(argp); | |
3adc28d8 | 6701 | goto out; |
1da177e4 | 6702 | |
1da177e4 | 6703 | #ifndef MODULE |
c02c0aeb N |
6704 | case RAID_AUTORUN: |
6705 | err = 0; | |
6706 | autostart_arrays(arg); | |
3adc28d8 | 6707 | goto out; |
1da177e4 | 6708 | #endif |
c02c0aeb | 6709 | default:; |
1da177e4 LT |
6710 | } |
6711 | ||
6712 | /* | |
6713 | * Commands creating/starting a new array: | |
6714 | */ | |
6715 | ||
a39907fa | 6716 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6717 | |
6718 | if (!mddev) { | |
6719 | BUG(); | |
3adc28d8 | 6720 | goto out; |
1da177e4 LT |
6721 | } |
6722 | ||
1ca69c4b N |
6723 | /* Some actions do not requires the mutex */ |
6724 | switch (cmd) { | |
6725 | case GET_ARRAY_INFO: | |
6726 | if (!mddev->raid_disks && !mddev->external) | |
6727 | err = -ENODEV; | |
6728 | else | |
6729 | err = get_array_info(mddev, argp); | |
3adc28d8 | 6730 | goto out; |
1ca69c4b N |
6731 | |
6732 | case GET_DISK_INFO: | |
6733 | if (!mddev->raid_disks && !mddev->external) | |
6734 | err = -ENODEV; | |
6735 | else | |
6736 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 6737 | goto out; |
1ca69c4b N |
6738 | |
6739 | case SET_DISK_FAULTY: | |
6740 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6741 | goto out; |
4af1a041 N |
6742 | |
6743 | case GET_BITMAP_FILE: | |
6744 | err = get_bitmap_file(mddev, argp); | |
6745 | goto out; | |
6746 | ||
1ca69c4b N |
6747 | } |
6748 | ||
a7a3f08d N |
6749 | if (cmd == ADD_NEW_DISK) |
6750 | /* need to ensure md_delayed_delete() has completed */ | |
6751 | flush_workqueue(md_misc_wq); | |
6752 | ||
90f5f7ad HR |
6753 | if (cmd == HOT_REMOVE_DISK) |
6754 | /* need to ensure recovery thread has run */ | |
6755 | wait_event_interruptible_timeout(mddev->sb_wait, | |
6756 | !test_bit(MD_RECOVERY_NEEDED, | |
6757 | &mddev->flags), | |
6758 | msecs_to_jiffies(5000)); | |
260fa034 N |
6759 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
6760 | /* Need to flush page cache, and ensure no-one else opens | |
6761 | * and writes | |
6762 | */ | |
6763 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 6764 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
6765 | mutex_unlock(&mddev->open_mutex); |
6766 | err = -EBUSY; | |
3adc28d8 | 6767 | goto out; |
260fa034 N |
6768 | } |
6769 | set_bit(MD_STILL_CLOSED, &mddev->flags); | |
6770 | mutex_unlock(&mddev->open_mutex); | |
6771 | sync_blockdev(bdev); | |
6772 | } | |
1da177e4 LT |
6773 | err = mddev_lock(mddev); |
6774 | if (err) { | |
f72ffdd6 | 6775 | printk(KERN_INFO |
1da177e4 LT |
6776 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
6777 | err, cmd); | |
3adc28d8 | 6778 | goto out; |
1da177e4 LT |
6779 | } |
6780 | ||
c02c0aeb N |
6781 | if (cmd == SET_ARRAY_INFO) { |
6782 | mdu_array_info_t info; | |
6783 | if (!arg) | |
6784 | memset(&info, 0, sizeof(info)); | |
6785 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6786 | err = -EFAULT; | |
3adc28d8 | 6787 | goto unlock; |
c02c0aeb N |
6788 | } |
6789 | if (mddev->pers) { | |
6790 | err = update_array_info(mddev, &info); | |
6791 | if (err) { | |
6792 | printk(KERN_WARNING "md: couldn't update" | |
6793 | " array info. %d\n", err); | |
3adc28d8 | 6794 | goto unlock; |
1da177e4 | 6795 | } |
3adc28d8 | 6796 | goto unlock; |
c02c0aeb N |
6797 | } |
6798 | if (!list_empty(&mddev->disks)) { | |
6799 | printk(KERN_WARNING | |
6800 | "md: array %s already has disks!\n", | |
6801 | mdname(mddev)); | |
6802 | err = -EBUSY; | |
3adc28d8 | 6803 | goto unlock; |
c02c0aeb N |
6804 | } |
6805 | if (mddev->raid_disks) { | |
6806 | printk(KERN_WARNING | |
6807 | "md: array %s already initialised!\n", | |
6808 | mdname(mddev)); | |
6809 | err = -EBUSY; | |
3adc28d8 | 6810 | goto unlock; |
c02c0aeb N |
6811 | } |
6812 | err = set_array_info(mddev, &info); | |
6813 | if (err) { | |
6814 | printk(KERN_WARNING "md: couldn't set" | |
6815 | " array info. %d\n", err); | |
3adc28d8 | 6816 | goto unlock; |
c02c0aeb | 6817 | } |
3adc28d8 | 6818 | goto unlock; |
1da177e4 LT |
6819 | } |
6820 | ||
6821 | /* | |
6822 | * Commands querying/configuring an existing array: | |
6823 | */ | |
32a7627c | 6824 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6825 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6826 | if ((!mddev->raid_disks && !mddev->external) |
6827 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6828 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6829 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 6830 | err = -ENODEV; |
3adc28d8 | 6831 | goto unlock; |
1da177e4 LT |
6832 | } |
6833 | ||
6834 | /* | |
6835 | * Commands even a read-only array can execute: | |
6836 | */ | |
c02c0aeb | 6837 | switch (cmd) { |
c02c0aeb N |
6838 | case RESTART_ARRAY_RW: |
6839 | err = restart_array(mddev); | |
3adc28d8 | 6840 | goto unlock; |
1da177e4 | 6841 | |
c02c0aeb N |
6842 | case STOP_ARRAY: |
6843 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 6844 | goto unlock; |
1da177e4 | 6845 | |
c02c0aeb N |
6846 | case STOP_ARRAY_RO: |
6847 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 6848 | goto unlock; |
1da177e4 | 6849 | |
3ea8929d N |
6850 | case HOT_REMOVE_DISK: |
6851 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6852 | goto unlock; |
3ea8929d | 6853 | |
7ceb17e8 N |
6854 | case ADD_NEW_DISK: |
6855 | /* We can support ADD_NEW_DISK on read-only arrays | |
6856 | * on if we are re-adding a preexisting device. | |
6857 | * So require mddev->pers and MD_DISK_SYNC. | |
6858 | */ | |
6859 | if (mddev->pers) { | |
6860 | mdu_disk_info_t info; | |
6861 | if (copy_from_user(&info, argp, sizeof(info))) | |
6862 | err = -EFAULT; | |
6863 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6864 | /* Need to clear read-only for this */ | |
6865 | break; | |
6866 | else | |
6867 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6868 | goto unlock; |
7ceb17e8 N |
6869 | } |
6870 | break; | |
6871 | ||
c02c0aeb N |
6872 | case BLKROSET: |
6873 | if (get_user(ro, (int __user *)(arg))) { | |
6874 | err = -EFAULT; | |
3adc28d8 | 6875 | goto unlock; |
c02c0aeb N |
6876 | } |
6877 | err = -EINVAL; | |
e2218350 | 6878 | |
c02c0aeb N |
6879 | /* if the bdev is going readonly the value of mddev->ro |
6880 | * does not matter, no writes are coming | |
6881 | */ | |
6882 | if (ro) | |
3adc28d8 | 6883 | goto unlock; |
e2218350 | 6884 | |
c02c0aeb N |
6885 | /* are we are already prepared for writes? */ |
6886 | if (mddev->ro != 1) | |
3adc28d8 | 6887 | goto unlock; |
e2218350 | 6888 | |
c02c0aeb N |
6889 | /* transitioning to readauto need only happen for |
6890 | * arrays that call md_write_start | |
6891 | */ | |
6892 | if (mddev->pers) { | |
6893 | err = restart_array(mddev); | |
6894 | if (err == 0) { | |
6895 | mddev->ro = 2; | |
6896 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6897 | } |
c02c0aeb | 6898 | } |
3adc28d8 | 6899 | goto unlock; |
1da177e4 LT |
6900 | } |
6901 | ||
6902 | /* | |
6903 | * The remaining ioctls are changing the state of the | |
f91de92e | 6904 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 6905 | */ |
326eb17d | 6906 | if (mddev->ro && mddev->pers) { |
f91de92e N |
6907 | if (mddev->ro == 2) { |
6908 | mddev->ro = 0; | |
00bcb4ac | 6909 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6910 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6911 | /* mddev_unlock will wake thread */ |
6912 | /* If a device failed while we were read-only, we | |
6913 | * need to make sure the metadata is updated now. | |
6914 | */ | |
6915 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6916 | mddev_unlock(mddev); | |
6917 | wait_event(mddev->sb_wait, | |
6918 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6919 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
29f097c4 | 6920 | mddev_lock_nointr(mddev); |
f3378b48 | 6921 | } |
f91de92e N |
6922 | } else { |
6923 | err = -EROFS; | |
3adc28d8 | 6924 | goto unlock; |
f91de92e | 6925 | } |
1da177e4 LT |
6926 | } |
6927 | ||
c02c0aeb N |
6928 | switch (cmd) { |
6929 | case ADD_NEW_DISK: | |
1da177e4 | 6930 | { |
c02c0aeb N |
6931 | mdu_disk_info_t info; |
6932 | if (copy_from_user(&info, argp, sizeof(info))) | |
6933 | err = -EFAULT; | |
6934 | else | |
6935 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6936 | goto unlock; |
c02c0aeb | 6937 | } |
1da177e4 | 6938 | |
1aee41f6 GR |
6939 | case CLUSTERED_DISK_NACK: |
6940 | if (mddev_is_clustered(mddev)) | |
6941 | md_cluster_ops->new_disk_ack(mddev, false); | |
6942 | else | |
6943 | err = -EINVAL; | |
6944 | goto unlock; | |
6945 | ||
c02c0aeb N |
6946 | case HOT_ADD_DISK: |
6947 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6948 | goto unlock; |
1da177e4 | 6949 | |
c02c0aeb N |
6950 | case RUN_ARRAY: |
6951 | err = do_md_run(mddev); | |
3adc28d8 | 6952 | goto unlock; |
1da177e4 | 6953 | |
c02c0aeb N |
6954 | case SET_BITMAP_FILE: |
6955 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 6956 | goto unlock; |
32a7627c | 6957 | |
c02c0aeb N |
6958 | default: |
6959 | err = -EINVAL; | |
3adc28d8 | 6960 | goto unlock; |
1da177e4 LT |
6961 | } |
6962 | ||
3adc28d8 | 6963 | unlock: |
d3374825 N |
6964 | if (mddev->hold_active == UNTIL_IOCTL && |
6965 | err != -EINVAL) | |
6966 | mddev->hold_active = 0; | |
1da177e4 | 6967 | mddev_unlock(mddev); |
3adc28d8 | 6968 | out: |
1da177e4 LT |
6969 | return err; |
6970 | } | |
aa98aa31 AB |
6971 | #ifdef CONFIG_COMPAT |
6972 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6973 | unsigned int cmd, unsigned long arg) | |
6974 | { | |
6975 | switch (cmd) { | |
6976 | case HOT_REMOVE_DISK: | |
6977 | case HOT_ADD_DISK: | |
6978 | case SET_DISK_FAULTY: | |
6979 | case SET_BITMAP_FILE: | |
6980 | /* These take in integer arg, do not convert */ | |
6981 | break; | |
6982 | default: | |
6983 | arg = (unsigned long)compat_ptr(arg); | |
6984 | break; | |
6985 | } | |
6986 | ||
6987 | return md_ioctl(bdev, mode, cmd, arg); | |
6988 | } | |
6989 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6990 | |
a39907fa | 6991 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6992 | { |
6993 | /* | |
6994 | * Succeed if we can lock the mddev, which confirms that | |
6995 | * it isn't being stopped right now. | |
6996 | */ | |
fd01b88c | 6997 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6998 | int err; |
6999 | ||
0c098220 YL |
7000 | if (!mddev) |
7001 | return -ENODEV; | |
7002 | ||
d3374825 N |
7003 | if (mddev->gendisk != bdev->bd_disk) { |
7004 | /* we are racing with mddev_put which is discarding this | |
7005 | * bd_disk. | |
7006 | */ | |
7007 | mddev_put(mddev); | |
7008 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 7009 | flush_workqueue(md_misc_wq); |
d3374825 N |
7010 | /* Then retry the open from the top */ |
7011 | return -ERESTARTSYS; | |
7012 | } | |
7013 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
7014 | ||
c8c00a69 | 7015 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
7016 | goto out; |
7017 | ||
7018 | err = 0; | |
f2ea68cf | 7019 | atomic_inc(&mddev->openers); |
260fa034 | 7020 | clear_bit(MD_STILL_CLOSED, &mddev->flags); |
c8c00a69 | 7021 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 7022 | |
f0b4f7e2 | 7023 | check_disk_change(bdev); |
1da177e4 LT |
7024 | out: |
7025 | return err; | |
7026 | } | |
7027 | ||
db2a144b | 7028 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 7029 | { |
f72ffdd6 | 7030 | struct mddev *mddev = disk->private_data; |
1da177e4 | 7031 | |
52e5f9d1 | 7032 | BUG_ON(!mddev); |
f2ea68cf | 7033 | atomic_dec(&mddev->openers); |
1da177e4 | 7034 | mddev_put(mddev); |
1da177e4 | 7035 | } |
f0b4f7e2 N |
7036 | |
7037 | static int md_media_changed(struct gendisk *disk) | |
7038 | { | |
fd01b88c | 7039 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
7040 | |
7041 | return mddev->changed; | |
7042 | } | |
7043 | ||
7044 | static int md_revalidate(struct gendisk *disk) | |
7045 | { | |
fd01b88c | 7046 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
7047 | |
7048 | mddev->changed = 0; | |
7049 | return 0; | |
7050 | } | |
83d5cde4 | 7051 | static const struct block_device_operations md_fops = |
1da177e4 LT |
7052 | { |
7053 | .owner = THIS_MODULE, | |
a39907fa AV |
7054 | .open = md_open, |
7055 | .release = md_release, | |
b492b852 | 7056 | .ioctl = md_ioctl, |
aa98aa31 AB |
7057 | #ifdef CONFIG_COMPAT |
7058 | .compat_ioctl = md_compat_ioctl, | |
7059 | #endif | |
a885c8c4 | 7060 | .getgeo = md_getgeo, |
f0b4f7e2 N |
7061 | .media_changed = md_media_changed, |
7062 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
7063 | }; |
7064 | ||
f72ffdd6 | 7065 | static int md_thread(void *arg) |
1da177e4 | 7066 | { |
2b8bf345 | 7067 | struct md_thread *thread = arg; |
1da177e4 | 7068 | |
1da177e4 LT |
7069 | /* |
7070 | * md_thread is a 'system-thread', it's priority should be very | |
7071 | * high. We avoid resource deadlocks individually in each | |
7072 | * raid personality. (RAID5 does preallocation) We also use RR and | |
7073 | * the very same RT priority as kswapd, thus we will never get | |
7074 | * into a priority inversion deadlock. | |
7075 | * | |
7076 | * we definitely have to have equal or higher priority than | |
7077 | * bdflush, otherwise bdflush will deadlock if there are too | |
7078 | * many dirty RAID5 blocks. | |
7079 | */ | |
1da177e4 | 7080 | |
6985c43f | 7081 | allow_signal(SIGKILL); |
a6fb0934 | 7082 | while (!kthread_should_stop()) { |
1da177e4 | 7083 | |
93588e22 N |
7084 | /* We need to wait INTERRUPTIBLE so that |
7085 | * we don't add to the load-average. | |
7086 | * That means we need to be sure no signals are | |
7087 | * pending | |
7088 | */ | |
7089 | if (signal_pending(current)) | |
7090 | flush_signals(current); | |
7091 | ||
7092 | wait_event_interruptible_timeout | |
7093 | (thread->wqueue, | |
7094 | test_bit(THREAD_WAKEUP, &thread->flags) | |
7095 | || kthread_should_stop(), | |
7096 | thread->timeout); | |
1da177e4 | 7097 | |
6c987910 N |
7098 | clear_bit(THREAD_WAKEUP, &thread->flags); |
7099 | if (!kthread_should_stop()) | |
4ed8731d | 7100 | thread->run(thread); |
1da177e4 | 7101 | } |
a6fb0934 | 7102 | |
1da177e4 LT |
7103 | return 0; |
7104 | } | |
7105 | ||
2b8bf345 | 7106 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
7107 | { |
7108 | if (thread) { | |
36a4e1fe | 7109 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
7110 | set_bit(THREAD_WAKEUP, &thread->flags); |
7111 | wake_up(&thread->wqueue); | |
7112 | } | |
7113 | } | |
6c144d31 | 7114 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 7115 | |
4ed8731d SL |
7116 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
7117 | struct mddev *mddev, const char *name) | |
1da177e4 | 7118 | { |
2b8bf345 | 7119 | struct md_thread *thread; |
1da177e4 | 7120 | |
2b8bf345 | 7121 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
7122 | if (!thread) |
7123 | return NULL; | |
7124 | ||
1da177e4 LT |
7125 | init_waitqueue_head(&thread->wqueue); |
7126 | ||
1da177e4 LT |
7127 | thread->run = run; |
7128 | thread->mddev = mddev; | |
32a7627c | 7129 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
7130 | thread->tsk = kthread_run(md_thread, thread, |
7131 | "%s_%s", | |
7132 | mdname(thread->mddev), | |
0232605d | 7133 | name); |
a6fb0934 | 7134 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
7135 | kfree(thread); |
7136 | return NULL; | |
7137 | } | |
1da177e4 LT |
7138 | return thread; |
7139 | } | |
6c144d31 | 7140 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 7141 | |
2b8bf345 | 7142 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 7143 | { |
2b8bf345 | 7144 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
7145 | if (!thread) |
7146 | return; | |
36a4e1fe | 7147 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
7148 | /* Locking ensures that mddev_unlock does not wake_up a |
7149 | * non-existent thread | |
7150 | */ | |
7151 | spin_lock(&pers_lock); | |
7152 | *threadp = NULL; | |
7153 | spin_unlock(&pers_lock); | |
a6fb0934 N |
7154 | |
7155 | kthread_stop(thread->tsk); | |
1da177e4 LT |
7156 | kfree(thread); |
7157 | } | |
6c144d31 | 7158 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 7159 | |
fd01b88c | 7160 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7161 | { |
b2d444d7 | 7162 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 7163 | return; |
6bfe0b49 | 7164 | |
de393cde | 7165 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
7166 | return; |
7167 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
7168 | if (mddev->degraded) |
7169 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 7170 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
7171 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7172 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7173 | md_wakeup_thread(mddev->thread); | |
768a418d | 7174 | if (mddev->event_work.func) |
e804ac78 | 7175 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 7176 | md_new_event_inintr(mddev); |
1da177e4 | 7177 | } |
6c144d31 | 7178 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
7179 | |
7180 | /* seq_file implementation /proc/mdstat */ | |
7181 | ||
7182 | static void status_unused(struct seq_file *seq) | |
7183 | { | |
7184 | int i = 0; | |
3cb03002 | 7185 | struct md_rdev *rdev; |
1da177e4 LT |
7186 | |
7187 | seq_printf(seq, "unused devices: "); | |
7188 | ||
159ec1fc | 7189 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
7190 | char b[BDEVNAME_SIZE]; |
7191 | i++; | |
7192 | seq_printf(seq, "%s ", | |
7193 | bdevname(rdev->bdev,b)); | |
7194 | } | |
7195 | if (!i) | |
7196 | seq_printf(seq, "<none>"); | |
7197 | ||
7198 | seq_printf(seq, "\n"); | |
7199 | } | |
7200 | ||
f7851be7 | 7201 | static int status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 7202 | { |
dd71cf6b N |
7203 | sector_t max_sectors, resync, res; |
7204 | unsigned long dt, db; | |
7205 | sector_t rt; | |
4588b42e N |
7206 | int scale; |
7207 | unsigned int per_milli; | |
1da177e4 | 7208 | |
c804cdec N |
7209 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
7210 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 7211 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 7212 | else |
dd71cf6b | 7213 | max_sectors = mddev->dev_sectors; |
1da177e4 | 7214 | |
f7851be7 N |
7215 | resync = mddev->curr_resync; |
7216 | if (resync <= 3) { | |
7217 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7218 | /* Still cleaning up */ | |
7219 | resync = max_sectors; | |
7220 | } else | |
7221 | resync -= atomic_read(&mddev->recovery_active); | |
7222 | ||
7223 | if (resync == 0) { | |
7224 | if (mddev->recovery_cp < MaxSector) { | |
7225 | seq_printf(seq, "\tresync=PENDING"); | |
7226 | return 1; | |
7227 | } | |
7228 | return 0; | |
7229 | } | |
7230 | if (resync < 3) { | |
7231 | seq_printf(seq, "\tresync=DELAYED"); | |
7232 | return 1; | |
7233 | } | |
7234 | ||
403df478 | 7235 | WARN_ON(max_sectors == 0); |
4588b42e | 7236 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 7237 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
7238 | * u32, as those are the requirements for sector_div. |
7239 | * Thus 'scale' must be at least 10 | |
7240 | */ | |
7241 | scale = 10; | |
7242 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 7243 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
7244 | scale++; |
7245 | } | |
7246 | res = (resync>>scale)*1000; | |
dd71cf6b | 7247 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
7248 | |
7249 | per_milli = res; | |
1da177e4 | 7250 | { |
4588b42e | 7251 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
7252 | seq_printf(seq, "["); |
7253 | for (i = 0; i < x; i++) | |
7254 | seq_printf(seq, "="); | |
7255 | seq_printf(seq, ">"); | |
7256 | for (i = 0; i < y; i++) | |
7257 | seq_printf(seq, "."); | |
7258 | seq_printf(seq, "] "); | |
7259 | } | |
4588b42e | 7260 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
7261 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
7262 | "reshape" : | |
61df9d91 N |
7263 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
7264 | "check" : | |
7265 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
7266 | "resync" : "recovery"))), | |
7267 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
7268 | (unsigned long long) resync/2, |
7269 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
7270 | |
7271 | /* | |
1da177e4 LT |
7272 | * dt: time from mark until now |
7273 | * db: blocks written from mark until now | |
7274 | * rt: remaining time | |
dd71cf6b N |
7275 | * |
7276 | * rt is a sector_t, so could be 32bit or 64bit. | |
7277 | * So we divide before multiply in case it is 32bit and close | |
7278 | * to the limit. | |
25985edc | 7279 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
7280 | * near the end of resync when the number of remaining sectors |
7281 | * is close to 'db'. | |
7282 | * We then divide rt by 32 after multiplying by db to compensate. | |
7283 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
7284 | */ |
7285 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
7286 | if (!dt) dt++; | |
ff4e8d9a N |
7287 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
7288 | - mddev->resync_mark_cnt; | |
1da177e4 | 7289 | |
dd71cf6b N |
7290 | rt = max_sectors - resync; /* number of remaining sectors */ |
7291 | sector_div(rt, db/32+1); | |
7292 | rt *= dt; | |
7293 | rt >>= 5; | |
7294 | ||
7295 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
7296 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 7297 | |
ff4e8d9a | 7298 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
f7851be7 | 7299 | return 1; |
1da177e4 LT |
7300 | } |
7301 | ||
7302 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
7303 | { | |
7304 | struct list_head *tmp; | |
7305 | loff_t l = *pos; | |
fd01b88c | 7306 | struct mddev *mddev; |
1da177e4 LT |
7307 | |
7308 | if (l >= 0x10000) | |
7309 | return NULL; | |
7310 | if (!l--) | |
7311 | /* header */ | |
7312 | return (void*)1; | |
7313 | ||
7314 | spin_lock(&all_mddevs_lock); | |
7315 | list_for_each(tmp,&all_mddevs) | |
7316 | if (!l--) { | |
fd01b88c | 7317 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
7318 | mddev_get(mddev); |
7319 | spin_unlock(&all_mddevs_lock); | |
7320 | return mddev; | |
7321 | } | |
7322 | spin_unlock(&all_mddevs_lock); | |
7323 | if (!l--) | |
7324 | return (void*)2;/* tail */ | |
7325 | return NULL; | |
7326 | } | |
7327 | ||
7328 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
7329 | { | |
7330 | struct list_head *tmp; | |
fd01b88c | 7331 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 7332 | |
1da177e4 LT |
7333 | ++*pos; |
7334 | if (v == (void*)2) | |
7335 | return NULL; | |
7336 | ||
7337 | spin_lock(&all_mddevs_lock); | |
7338 | if (v == (void*)1) | |
7339 | tmp = all_mddevs.next; | |
7340 | else | |
7341 | tmp = mddev->all_mddevs.next; | |
7342 | if (tmp != &all_mddevs) | |
fd01b88c | 7343 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
7344 | else { |
7345 | next_mddev = (void*)2; | |
7346 | *pos = 0x10000; | |
f72ffdd6 | 7347 | } |
1da177e4 LT |
7348 | spin_unlock(&all_mddevs_lock); |
7349 | ||
7350 | if (v != (void*)1) | |
7351 | mddev_put(mddev); | |
7352 | return next_mddev; | |
7353 | ||
7354 | } | |
7355 | ||
7356 | static void md_seq_stop(struct seq_file *seq, void *v) | |
7357 | { | |
fd01b88c | 7358 | struct mddev *mddev = v; |
1da177e4 LT |
7359 | |
7360 | if (mddev && v != (void*)1 && v != (void*)2) | |
7361 | mddev_put(mddev); | |
7362 | } | |
7363 | ||
7364 | static int md_seq_show(struct seq_file *seq, void *v) | |
7365 | { | |
fd01b88c | 7366 | struct mddev *mddev = v; |
dd8ac336 | 7367 | sector_t sectors; |
3cb03002 | 7368 | struct md_rdev *rdev; |
1da177e4 LT |
7369 | |
7370 | if (v == (void*)1) { | |
84fc4b56 | 7371 | struct md_personality *pers; |
1da177e4 LT |
7372 | seq_printf(seq, "Personalities : "); |
7373 | spin_lock(&pers_lock); | |
2604b703 N |
7374 | list_for_each_entry(pers, &pers_list, list) |
7375 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
7376 | |
7377 | spin_unlock(&pers_lock); | |
7378 | seq_printf(seq, "\n"); | |
f1514638 | 7379 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
7380 | return 0; |
7381 | } | |
7382 | if (v == (void*)2) { | |
7383 | status_unused(seq); | |
7384 | return 0; | |
7385 | } | |
7386 | ||
36d091f4 | 7387 | spin_lock(&mddev->lock); |
1da177e4 LT |
7388 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
7389 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
7390 | mddev->pers ? "" : "in"); | |
7391 | if (mddev->pers) { | |
f91de92e | 7392 | if (mddev->ro==1) |
1da177e4 | 7393 | seq_printf(seq, " (read-only)"); |
f91de92e | 7394 | if (mddev->ro==2) |
52720ae7 | 7395 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
7396 | seq_printf(seq, " %s", mddev->pers->name); |
7397 | } | |
7398 | ||
dd8ac336 | 7399 | sectors = 0; |
f97fcad3 N |
7400 | rcu_read_lock(); |
7401 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 LT |
7402 | char b[BDEVNAME_SIZE]; |
7403 | seq_printf(seq, " %s[%d]", | |
7404 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
7405 | if (test_bit(WriteMostly, &rdev->flags)) |
7406 | seq_printf(seq, "(W)"); | |
9efdca16 SL |
7407 | if (test_bit(Journal, &rdev->flags)) |
7408 | seq_printf(seq, "(J)"); | |
b2d444d7 | 7409 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7410 | seq_printf(seq, "(F)"); |
7411 | continue; | |
2d78f8c4 N |
7412 | } |
7413 | if (rdev->raid_disk < 0) | |
b325a32e | 7414 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
7415 | if (test_bit(Replacement, &rdev->flags)) |
7416 | seq_printf(seq, "(R)"); | |
dd8ac336 | 7417 | sectors += rdev->sectors; |
1da177e4 | 7418 | } |
f97fcad3 | 7419 | rcu_read_unlock(); |
1da177e4 LT |
7420 | |
7421 | if (!list_empty(&mddev->disks)) { | |
7422 | if (mddev->pers) | |
7423 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
7424 | (unsigned long long) |
7425 | mddev->array_sectors / 2); | |
1da177e4 LT |
7426 | else |
7427 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 7428 | (unsigned long long)sectors / 2); |
1da177e4 | 7429 | } |
1cd6bf19 N |
7430 | if (mddev->persistent) { |
7431 | if (mddev->major_version != 0 || | |
7432 | mddev->minor_version != 90) { | |
7433 | seq_printf(seq," super %d.%d", | |
7434 | mddev->major_version, | |
7435 | mddev->minor_version); | |
7436 | } | |
e691063a N |
7437 | } else if (mddev->external) |
7438 | seq_printf(seq, " super external:%s", | |
7439 | mddev->metadata_type); | |
7440 | else | |
1cd6bf19 | 7441 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
7442 | |
7443 | if (mddev->pers) { | |
d710e138 | 7444 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 7445 | seq_printf(seq, "\n "); |
8e1b39d6 | 7446 | if (mddev->pers->sync_request) { |
f7851be7 | 7447 | if (status_resync(seq, mddev)) |
8e1b39d6 | 7448 | seq_printf(seq, "\n "); |
8e1b39d6 | 7449 | } |
32a7627c N |
7450 | } else |
7451 | seq_printf(seq, "\n "); | |
7452 | ||
57148964 | 7453 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7454 | |
7455 | seq_printf(seq, "\n"); | |
7456 | } | |
36d091f4 | 7457 | spin_unlock(&mddev->lock); |
f72ffdd6 | 7458 | |
1da177e4 LT |
7459 | return 0; |
7460 | } | |
7461 | ||
110518bc | 7462 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7463 | .start = md_seq_start, |
7464 | .next = md_seq_next, | |
7465 | .stop = md_seq_stop, | |
7466 | .show = md_seq_show, | |
7467 | }; | |
7468 | ||
7469 | static int md_seq_open(struct inode *inode, struct file *file) | |
7470 | { | |
f1514638 | 7471 | struct seq_file *seq; |
1da177e4 LT |
7472 | int error; |
7473 | ||
7474 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7475 | if (error) |
f1514638 KS |
7476 | return error; |
7477 | ||
7478 | seq = file->private_data; | |
7479 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7480 | return error; |
7481 | } | |
7482 | ||
e2f23b60 | 7483 | static int md_unloading; |
d7603b7e N |
7484 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7485 | { | |
f1514638 | 7486 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7487 | int mask; |
7488 | ||
e2f23b60 | 7489 | if (md_unloading) |
7d7e64f2 | 7490 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7491 | poll_wait(filp, &md_event_waiters, wait); |
7492 | ||
7493 | /* always allow read */ | |
7494 | mask = POLLIN | POLLRDNORM; | |
7495 | ||
f1514638 | 7496 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7497 | mask |= POLLERR | POLLPRI; |
7498 | return mask; | |
7499 | } | |
7500 | ||
fa027c2a | 7501 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7502 | .owner = THIS_MODULE, |
1da177e4 LT |
7503 | .open = md_seq_open, |
7504 | .read = seq_read, | |
7505 | .llseek = seq_lseek, | |
c3f94b40 | 7506 | .release = seq_release_private, |
d7603b7e | 7507 | .poll = mdstat_poll, |
1da177e4 LT |
7508 | }; |
7509 | ||
84fc4b56 | 7510 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7511 | { |
50bd3774 CY |
7512 | printk(KERN_INFO "md: %s personality registered for level %d\n", |
7513 | p->name, p->level); | |
1da177e4 | 7514 | spin_lock(&pers_lock); |
2604b703 | 7515 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7516 | spin_unlock(&pers_lock); |
7517 | return 0; | |
7518 | } | |
6c144d31 | 7519 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7520 | |
84fc4b56 | 7521 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7522 | { |
2604b703 | 7523 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7524 | spin_lock(&pers_lock); |
2604b703 | 7525 | list_del_init(&p->list); |
1da177e4 LT |
7526 | spin_unlock(&pers_lock); |
7527 | return 0; | |
7528 | } | |
6c144d31 | 7529 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7530 | |
6022e75b N |
7531 | int register_md_cluster_operations(struct md_cluster_operations *ops, |
7532 | struct module *module) | |
edb39c9d | 7533 | { |
6022e75b | 7534 | int ret = 0; |
edb39c9d | 7535 | spin_lock(&pers_lock); |
6022e75b N |
7536 | if (md_cluster_ops != NULL) |
7537 | ret = -EALREADY; | |
7538 | else { | |
7539 | md_cluster_ops = ops; | |
7540 | md_cluster_mod = module; | |
7541 | } | |
edb39c9d | 7542 | spin_unlock(&pers_lock); |
6022e75b | 7543 | return ret; |
edb39c9d GR |
7544 | } |
7545 | EXPORT_SYMBOL(register_md_cluster_operations); | |
7546 | ||
7547 | int unregister_md_cluster_operations(void) | |
7548 | { | |
7549 | spin_lock(&pers_lock); | |
7550 | md_cluster_ops = NULL; | |
7551 | spin_unlock(&pers_lock); | |
7552 | return 0; | |
7553 | } | |
7554 | EXPORT_SYMBOL(unregister_md_cluster_operations); | |
7555 | ||
7556 | int md_setup_cluster(struct mddev *mddev, int nodes) | |
7557 | { | |
7558 | int err; | |
7559 | ||
7560 | err = request_module("md-cluster"); | |
7561 | if (err) { | |
7562 | pr_err("md-cluster module not found.\n"); | |
b0c26a79 | 7563 | return -ENOENT; |
edb39c9d GR |
7564 | } |
7565 | ||
7566 | spin_lock(&pers_lock); | |
7567 | if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { | |
7568 | spin_unlock(&pers_lock); | |
7569 | return -ENOENT; | |
7570 | } | |
7571 | spin_unlock(&pers_lock); | |
7572 | ||
cf921cc1 | 7573 | return md_cluster_ops->join(mddev, nodes); |
edb39c9d GR |
7574 | } |
7575 | ||
7576 | void md_cluster_stop(struct mddev *mddev) | |
7577 | { | |
c4ce867f GR |
7578 | if (!md_cluster_ops) |
7579 | return; | |
edb39c9d GR |
7580 | md_cluster_ops->leave(mddev); |
7581 | module_put(md_cluster_mod); | |
7582 | } | |
7583 | ||
fd01b88c | 7584 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7585 | { |
f72ffdd6 | 7586 | struct md_rdev *rdev; |
1da177e4 | 7587 | int idle; |
eea1bf38 | 7588 | int curr_events; |
1da177e4 LT |
7589 | |
7590 | idle = 1; | |
4b80991c N |
7591 | rcu_read_lock(); |
7592 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7593 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7594 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7595 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7596 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7597 | /* sync IO will cause sync_io to increase before the disk_stats |
7598 | * as sync_io is counted when a request starts, and | |
7599 | * disk_stats is counted when it completes. | |
7600 | * So resync activity will cause curr_events to be smaller than | |
7601 | * when there was no such activity. | |
7602 | * non-sync IO will cause disk_stat to increase without | |
7603 | * increasing sync_io so curr_events will (eventually) | |
7604 | * be larger than it was before. Once it becomes | |
7605 | * substantially larger, the test below will cause | |
7606 | * the array to appear non-idle, and resync will slow | |
7607 | * down. | |
7608 | * If there is a lot of outstanding resync activity when | |
7609 | * we set last_event to curr_events, then all that activity | |
7610 | * completing might cause the array to appear non-idle | |
7611 | * and resync will be slowed down even though there might | |
7612 | * not have been non-resync activity. This will only | |
7613 | * happen once though. 'last_events' will soon reflect | |
7614 | * the state where there is little or no outstanding | |
7615 | * resync requests, and further resync activity will | |
7616 | * always make curr_events less than last_events. | |
c0e48521 | 7617 | * |
1da177e4 | 7618 | */ |
eea1bf38 | 7619 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7620 | rdev->last_events = curr_events; |
7621 | idle = 0; | |
7622 | } | |
7623 | } | |
4b80991c | 7624 | rcu_read_unlock(); |
1da177e4 LT |
7625 | return idle; |
7626 | } | |
7627 | ||
fd01b88c | 7628 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7629 | { |
7630 | /* another "blocks" (512byte) blocks have been synced */ | |
7631 | atomic_sub(blocks, &mddev->recovery_active); | |
7632 | wake_up(&mddev->recovery_wait); | |
7633 | if (!ok) { | |
dfc70645 | 7634 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7635 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7636 | md_wakeup_thread(mddev->thread); |
7637 | // stop recovery, signal do_sync .... | |
7638 | } | |
7639 | } | |
6c144d31 | 7640 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 7641 | |
06d91a5f N |
7642 | /* md_write_start(mddev, bi) |
7643 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7644 | * in superblock) before writing, schedule a superblock update |
7645 | * and wait for it to complete. | |
06d91a5f | 7646 | */ |
fd01b88c | 7647 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7648 | { |
0fd62b86 | 7649 | int did_change = 0; |
06d91a5f | 7650 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7651 | return; |
06d91a5f | 7652 | |
f91de92e N |
7653 | BUG_ON(mddev->ro == 1); |
7654 | if (mddev->ro == 2) { | |
7655 | /* need to switch to read/write */ | |
7656 | mddev->ro = 0; | |
7657 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7658 | md_wakeup_thread(mddev->thread); | |
25156198 | 7659 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7660 | did_change = 1; |
f91de92e | 7661 | } |
06d91a5f | 7662 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7663 | if (mddev->safemode == 1) |
7664 | mddev->safemode = 0; | |
06d91a5f | 7665 | if (mddev->in_sync) { |
85572d7c | 7666 | spin_lock(&mddev->lock); |
3d310eb7 N |
7667 | if (mddev->in_sync) { |
7668 | mddev->in_sync = 0; | |
850b2b42 | 7669 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7670 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7671 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7672 | did_change = 1; |
3d310eb7 | 7673 | } |
85572d7c | 7674 | spin_unlock(&mddev->lock); |
06d91a5f | 7675 | } |
0fd62b86 | 7676 | if (did_change) |
00bcb4ac | 7677 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7678 | wait_event(mddev->sb_wait, |
09a44cc1 | 7679 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 | 7680 | } |
6c144d31 | 7681 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 7682 | |
fd01b88c | 7683 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7684 | { |
7685 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7686 | if (mddev->safemode == 2) | |
7687 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7688 | else if (mddev->safemode_delay) |
1da177e4 LT |
7689 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7690 | } | |
7691 | } | |
6c144d31 | 7692 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 7693 | |
2a2275d6 N |
7694 | /* md_allow_write(mddev) |
7695 | * Calling this ensures that the array is marked 'active' so that writes | |
7696 | * may proceed without blocking. It is important to call this before | |
7697 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7698 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7699 | * |
7700 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7701 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7702 | */ |
fd01b88c | 7703 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7704 | { |
7705 | if (!mddev->pers) | |
b5470dc5 | 7706 | return 0; |
2a2275d6 | 7707 | if (mddev->ro) |
b5470dc5 | 7708 | return 0; |
1a0fd497 | 7709 | if (!mddev->pers->sync_request) |
b5470dc5 | 7710 | return 0; |
2a2275d6 | 7711 | |
85572d7c | 7712 | spin_lock(&mddev->lock); |
2a2275d6 N |
7713 | if (mddev->in_sync) { |
7714 | mddev->in_sync = 0; | |
7715 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7716 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7717 | if (mddev->safemode_delay && |
7718 | mddev->safemode == 0) | |
7719 | mddev->safemode = 1; | |
85572d7c | 7720 | spin_unlock(&mddev->lock); |
2a2275d6 | 7721 | md_update_sb(mddev, 0); |
00bcb4ac | 7722 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 | 7723 | } else |
85572d7c | 7724 | spin_unlock(&mddev->lock); |
b5470dc5 | 7725 | |
070dc6dd | 7726 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7727 | return -EAGAIN; |
7728 | else | |
7729 | return 0; | |
2a2275d6 N |
7730 | } |
7731 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7732 | ||
1da177e4 LT |
7733 | #define SYNC_MARKS 10 |
7734 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7735 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7736 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7737 | { |
4ed8731d | 7738 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7739 | struct mddev *mddev2; |
1da177e4 LT |
7740 | unsigned int currspeed = 0, |
7741 | window; | |
ac7e50a3 | 7742 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 7743 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7744 | unsigned long update_time; |
1da177e4 LT |
7745 | sector_t mark_cnt[SYNC_MARKS]; |
7746 | int last_mark,m; | |
7747 | struct list_head *tmp; | |
7748 | sector_t last_check; | |
57afd89f | 7749 | int skipped = 0; |
3cb03002 | 7750 | struct md_rdev *rdev; |
c4a39551 | 7751 | char *desc, *action = NULL; |
7c2c57c9 | 7752 | struct blk_plug plug; |
c186b128 | 7753 | bool cluster_resync_finished = false; |
1da177e4 LT |
7754 | |
7755 | /* just incase thread restarts... */ | |
7756 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7757 | return; | |
3991b31e N |
7758 | if (mddev->ro) {/* never try to sync a read-only array */ |
7759 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 7760 | return; |
3991b31e | 7761 | } |
1da177e4 | 7762 | |
61df9d91 | 7763 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 7764 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 7765 | desc = "data-check"; |
c4a39551 JB |
7766 | action = "check"; |
7767 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 7768 | desc = "requested-resync"; |
c4a39551 JB |
7769 | action = "repair"; |
7770 | } else | |
61df9d91 N |
7771 | desc = "resync"; |
7772 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7773 | desc = "reshape"; | |
7774 | else | |
7775 | desc = "recovery"; | |
7776 | ||
c4a39551 JB |
7777 | mddev->last_sync_action = action ?: desc; |
7778 | ||
1da177e4 LT |
7779 | /* we overload curr_resync somewhat here. |
7780 | * 0 == not engaged in resync at all | |
7781 | * 2 == checking that there is no conflict with another sync | |
7782 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7783 | * commense | |
7784 | * other == active in resync - this many blocks | |
7785 | * | |
7786 | * Before starting a resync we must have set curr_resync to | |
7787 | * 2, and then checked that every "conflicting" array has curr_resync | |
7788 | * less than ours. When we find one that is the same or higher | |
7789 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7790 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7791 | * This will mean we have to start checking from the beginning again. | |
7792 | * | |
7793 | */ | |
7794 | ||
7795 | do { | |
7796 | mddev->curr_resync = 2; | |
7797 | ||
7798 | try_again: | |
404e4b43 | 7799 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 7800 | goto skip; |
29ac4aa3 | 7801 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7802 | if (mddev2 == mddev) |
7803 | continue; | |
90b08710 BS |
7804 | if (!mddev->parallel_resync |
7805 | && mddev2->curr_resync | |
7806 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7807 | DEFINE_WAIT(wq); |
7808 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7809 | /* arbitrarily yield */ | |
7810 | mddev->curr_resync = 1; | |
7811 | wake_up(&resync_wait); | |
7812 | } | |
7813 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7814 | /* no need to wait here, we can wait the next | |
7815 | * time 'round when curr_resync == 2 | |
7816 | */ | |
7817 | continue; | |
9744197c N |
7818 | /* We need to wait 'interruptible' so as not to |
7819 | * contribute to the load average, and not to | |
7820 | * be caught by 'softlockup' | |
7821 | */ | |
7822 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 7823 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 7824 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7825 | printk(KERN_INFO "md: delaying %s of %s" |
7826 | " until %s has finished (they" | |
1da177e4 | 7827 | " share one or more physical units)\n", |
61df9d91 | 7828 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7829 | mddev_put(mddev2); |
9744197c N |
7830 | if (signal_pending(current)) |
7831 | flush_signals(current); | |
1da177e4 LT |
7832 | schedule(); |
7833 | finish_wait(&resync_wait, &wq); | |
7834 | goto try_again; | |
7835 | } | |
7836 | finish_wait(&resync_wait, &wq); | |
7837 | } | |
7838 | } | |
7839 | } while (mddev->curr_resync < 2); | |
7840 | ||
5fd6c1dc | 7841 | j = 0; |
9d88883e | 7842 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7843 | /* resync follows the size requested by the personality, |
57afd89f | 7844 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7845 | */ |
7846 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7847 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7848 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7849 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7850 | j = mddev->resync_min; | |
7851 | else if (!mddev->bitmap) | |
5fd6c1dc | 7852 | j = mddev->recovery_cp; |
5e96ee65 | 7853 | |
ccfcc3c1 | 7854 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7855 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7856 | else { |
1da177e4 | 7857 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7858 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7859 | j = MaxSector; |
4e59ca7d | 7860 | rcu_read_lock(); |
dafb20fa | 7861 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7862 | if (rdev->raid_disk >= 0 && |
f2076e7d | 7863 | !test_bit(Journal, &rdev->flags) && |
5fd6c1dc N |
7864 | !test_bit(Faulty, &rdev->flags) && |
7865 | !test_bit(In_sync, &rdev->flags) && | |
7866 | rdev->recovery_offset < j) | |
7867 | j = rdev->recovery_offset; | |
4e59ca7d | 7868 | rcu_read_unlock(); |
133d4527 N |
7869 | |
7870 | /* If there is a bitmap, we need to make sure all | |
7871 | * writes that started before we added a spare | |
7872 | * complete before we start doing a recovery. | |
7873 | * Otherwise the write might complete and (via | |
7874 | * bitmap_endwrite) set a bit in the bitmap after the | |
7875 | * recovery has checked that bit and skipped that | |
7876 | * region. | |
7877 | */ | |
7878 | if (mddev->bitmap) { | |
7879 | mddev->pers->quiesce(mddev, 1); | |
7880 | mddev->pers->quiesce(mddev, 0); | |
7881 | } | |
5fd6c1dc | 7882 | } |
1da177e4 | 7883 | |
61df9d91 N |
7884 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7885 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7886 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7887 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7888 | "(but not more than %d KB/sec) for %s.\n", |
7889 | speed_max(mddev), desc); | |
1da177e4 | 7890 | |
eea1bf38 | 7891 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7892 | |
57afd89f | 7893 | io_sectors = 0; |
1da177e4 LT |
7894 | for (m = 0; m < SYNC_MARKS; m++) { |
7895 | mark[m] = jiffies; | |
57afd89f | 7896 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7897 | } |
7898 | last_mark = 0; | |
7899 | mddev->resync_mark = mark[last_mark]; | |
7900 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7901 | ||
7902 | /* | |
7903 | * Tune reconstruction: | |
7904 | */ | |
7905 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7906 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7907 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7908 | |
7909 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7910 | last_check = 0; |
7911 | ||
7912 | if (j>2) { | |
c91abf5a | 7913 | printk(KERN_INFO |
61df9d91 N |
7914 | "md: resuming %s of %s from checkpoint.\n", |
7915 | desc, mdname(mddev)); | |
1da177e4 | 7916 | mddev->curr_resync = j; |
72f36d59 N |
7917 | } else |
7918 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7919 | mddev->curr_resync_completed = j; |
72f36d59 N |
7920 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7921 | md_new_event(mddev); | |
54f89341 | 7922 | update_time = jiffies; |
1da177e4 | 7923 | |
7c2c57c9 | 7924 | blk_start_plug(&plug); |
1da177e4 | 7925 | while (j < max_sectors) { |
57afd89f | 7926 | sector_t sectors; |
1da177e4 | 7927 | |
57afd89f | 7928 | skipped = 0; |
97e4f42d | 7929 | |
7a91ee1f N |
7930 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7931 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7932 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7933 | > (max_sectors >> 4)) || | |
54f89341 | 7934 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f | 7935 | (j - mddev->curr_resync_completed)*2 |
c5e19d90 N |
7936 | >= mddev->resync_max - mddev->curr_resync_completed || |
7937 | mddev->curr_resync_completed > mddev->resync_max | |
7a91ee1f | 7938 | )) { |
97e4f42d | 7939 | /* time to update curr_resync_completed */ |
97e4f42d N |
7940 | wait_event(mddev->recovery_wait, |
7941 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7942 | mddev->curr_resync_completed = j; |
35d78c66 | 7943 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
7944 | j > mddev->recovery_cp) | |
7945 | mddev->recovery_cp = j; | |
54f89341 | 7946 | update_time = jiffies; |
070dc6dd | 7947 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7948 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7949 | } |
acb180b0 | 7950 | |
c91abf5a N |
7951 | while (j >= mddev->resync_max && |
7952 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
7953 | /* As this condition is controlled by user-space, |
7954 | * we can block indefinitely, so use '_interruptible' | |
7955 | * to avoid triggering warnings. | |
7956 | */ | |
7957 | flush_signals(current); /* just in case */ | |
7958 | wait_event_interruptible(mddev->recovery_wait, | |
7959 | mddev->resync_max > j | |
c91abf5a N |
7960 | || test_bit(MD_RECOVERY_INTR, |
7961 | &mddev->recovery)); | |
e62e58a5 | 7962 | } |
acb180b0 | 7963 | |
c91abf5a N |
7964 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7965 | break; | |
acb180b0 | 7966 | |
09314799 | 7967 | sectors = mddev->pers->sync_request(mddev, j, &skipped); |
57afd89f | 7968 | if (sectors == 0) { |
dfc70645 | 7969 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 7970 | break; |
1da177e4 | 7971 | } |
57afd89f N |
7972 | |
7973 | if (!skipped) { /* actual IO requested */ | |
7974 | io_sectors += sectors; | |
7975 | atomic_add(sectors, &mddev->recovery_active); | |
7976 | } | |
7977 | ||
e875ecea N |
7978 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7979 | break; | |
7980 | ||
1da177e4 | 7981 | j += sectors; |
5ed1df2e N |
7982 | if (j > max_sectors) |
7983 | /* when skipping, extra large numbers can be returned. */ | |
7984 | j = max_sectors; | |
72f36d59 N |
7985 | if (j > 2) |
7986 | mddev->curr_resync = j; | |
ff4e8d9a | 7987 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7988 | if (last_check == 0) |
e875ecea | 7989 | /* this is the earliest that rebuild will be |
d7603b7e N |
7990 | * visible in /proc/mdstat |
7991 | */ | |
7992 | md_new_event(mddev); | |
57afd89f N |
7993 | |
7994 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7995 | continue; |
7996 | ||
57afd89f | 7997 | last_check = io_sectors; |
1da177e4 LT |
7998 | repeat: |
7999 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
8000 | /* step marks */ | |
8001 | int next = (last_mark+1) % SYNC_MARKS; | |
8002 | ||
8003 | mddev->resync_mark = mark[next]; | |
8004 | mddev->resync_mark_cnt = mark_cnt[next]; | |
8005 | mark[next] = jiffies; | |
57afd89f | 8006 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
8007 | last_mark = next; |
8008 | } | |
8009 | ||
c91abf5a N |
8010 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
8011 | break; | |
1da177e4 LT |
8012 | |
8013 | /* | |
8014 | * this loop exits only if either when we are slower than | |
8015 | * the 'hard' speed limit, or the system was IO-idle for | |
8016 | * a jiffy. | |
8017 | * the system might be non-idle CPU-wise, but we only care | |
8018 | * about not overloading the IO subsystem. (things like an | |
8019 | * e2fsck being done on the RAID array should execute fast) | |
8020 | */ | |
1da177e4 LT |
8021 | cond_resched(); |
8022 | ||
ac7e50a3 XN |
8023 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
8024 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 8025 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 8026 | |
88202a0c | 8027 | if (currspeed > speed_min(mddev)) { |
ac8fa419 | 8028 | if (currspeed > speed_max(mddev)) { |
c0e48521 | 8029 | msleep(500); |
1da177e4 LT |
8030 | goto repeat; |
8031 | } | |
ac8fa419 N |
8032 | if (!is_mddev_idle(mddev, 0)) { |
8033 | /* | |
8034 | * Give other IO more of a chance. | |
8035 | * The faster the devices, the less we wait. | |
8036 | */ | |
8037 | wait_event(mddev->recovery_wait, | |
8038 | !atomic_read(&mddev->recovery_active)); | |
8039 | } | |
1da177e4 LT |
8040 | } |
8041 | } | |
c91abf5a N |
8042 | printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
8043 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
8044 | ? "interrupted" : "done"); | |
1da177e4 LT |
8045 | /* |
8046 | * this also signals 'finished resyncing' to md_stop | |
8047 | */ | |
7c2c57c9 | 8048 | blk_finish_plug(&plug); |
1da177e4 LT |
8049 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
8050 | ||
5ed1df2e N |
8051 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
8052 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8053 | mddev->curr_resync > 2) { | |
8054 | mddev->curr_resync_completed = mddev->curr_resync; | |
8055 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
8056 | } | |
c186b128 GR |
8057 | /* tell personality and other nodes that we are finished */ |
8058 | if (mddev_is_clustered(mddev)) { | |
8059 | md_cluster_ops->resync_finish(mddev); | |
8060 | cluster_resync_finished = true; | |
8061 | } | |
09314799 | 8062 | mddev->pers->sync_request(mddev, max_sectors, &skipped); |
1da177e4 | 8063 | |
dfc70645 | 8064 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
8065 | mddev->curr_resync > 2) { |
8066 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
8067 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
8068 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
8069 | printk(KERN_INFO | |
61df9d91 N |
8070 | "md: checkpointing %s of %s.\n", |
8071 | desc, mdname(mddev)); | |
0a19caab | 8072 | if (test_bit(MD_RECOVERY_ERROR, |
8073 | &mddev->recovery)) | |
8074 | mddev->recovery_cp = | |
8075 | mddev->curr_resync_completed; | |
8076 | else | |
8077 | mddev->recovery_cp = | |
8078 | mddev->curr_resync; | |
5fd6c1dc N |
8079 | } |
8080 | } else | |
8081 | mddev->recovery_cp = MaxSector; | |
8082 | } else { | |
8083 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
8084 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 8085 | rcu_read_lock(); |
dafb20fa | 8086 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 8087 | if (rdev->raid_disk >= 0 && |
70fffd0b | 8088 | mddev->delta_disks >= 0 && |
f2076e7d | 8089 | !test_bit(Journal, &rdev->flags) && |
5fd6c1dc N |
8090 | !test_bit(Faulty, &rdev->flags) && |
8091 | !test_bit(In_sync, &rdev->flags) && | |
8092 | rdev->recovery_offset < mddev->curr_resync) | |
8093 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 8094 | rcu_read_unlock(); |
5fd6c1dc | 8095 | } |
1da177e4 | 8096 | } |
db91ff55 | 8097 | skip: |
17571284 | 8098 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 8099 | |
c186b128 GR |
8100 | if (mddev_is_clustered(mddev) && |
8101 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8102 | !cluster_resync_finished) | |
8103 | md_cluster_ops->resync_finish(mddev); | |
8104 | ||
23da422b | 8105 | spin_lock(&mddev->lock); |
c07b70ad N |
8106 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
8107 | /* We completed so min/max setting can be forgotten if used. */ | |
8108 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
8109 | mddev->resync_min = 0; | |
8110 | mddev->resync_max = MaxSector; | |
8111 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
8112 | mddev->resync_min = mddev->curr_resync_completed; | |
f7851be7 | 8113 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); |
1da177e4 | 8114 | mddev->curr_resync = 0; |
23da422b N |
8115 | spin_unlock(&mddev->lock); |
8116 | ||
1da177e4 | 8117 | wake_up(&resync_wait); |
1da177e4 | 8118 | md_wakeup_thread(mddev->thread); |
c6207277 | 8119 | return; |
1da177e4 | 8120 | } |
29269553 | 8121 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 8122 | |
746d3207 N |
8123 | static int remove_and_add_spares(struct mddev *mddev, |
8124 | struct md_rdev *this) | |
b4c4c7b8 | 8125 | { |
3cb03002 | 8126 | struct md_rdev *rdev; |
b4c4c7b8 | 8127 | int spares = 0; |
f2a371c5 | 8128 | int removed = 0; |
b4c4c7b8 | 8129 | |
dafb20fa | 8130 | rdev_for_each(rdev, mddev) |
746d3207 N |
8131 | if ((this == NULL || rdev == this) && |
8132 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 8133 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 | 8134 | (test_bit(Faulty, &rdev->flags) || |
f2076e7d SL |
8135 | (!test_bit(In_sync, &rdev->flags) && |
8136 | !test_bit(Journal, &rdev->flags))) && | |
b4c4c7b8 N |
8137 | atomic_read(&rdev->nr_pending)==0) { |
8138 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 8139 | mddev, rdev) == 0) { |
36fad858 | 8140 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 8141 | rdev->raid_disk = -1; |
f2a371c5 | 8142 | removed++; |
b4c4c7b8 N |
8143 | } |
8144 | } | |
90584fc9 JB |
8145 | if (removed && mddev->kobj.sd) |
8146 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 8147 | |
2910ff17 | 8148 | if (this && removed) |
746d3207 N |
8149 | goto no_add; |
8150 | ||
dafb20fa | 8151 | rdev_for_each(rdev, mddev) { |
2910ff17 GR |
8152 | if (this && this != rdev) |
8153 | continue; | |
dbb64f86 GR |
8154 | if (test_bit(Candidate, &rdev->flags)) |
8155 | continue; | |
7bfec5f3 N |
8156 | if (rdev->raid_disk >= 0 && |
8157 | !test_bit(In_sync, &rdev->flags) && | |
f2076e7d | 8158 | !test_bit(Journal, &rdev->flags) && |
7bfec5f3 N |
8159 | !test_bit(Faulty, &rdev->flags)) |
8160 | spares++; | |
7ceb17e8 N |
8161 | if (rdev->raid_disk >= 0) |
8162 | continue; | |
8163 | if (test_bit(Faulty, &rdev->flags)) | |
8164 | continue; | |
3069aa8d SL |
8165 | if (test_bit(Journal, &rdev->flags)) |
8166 | continue; | |
7ceb17e8 | 8167 | if (mddev->ro && |
8313b8e5 N |
8168 | ! (rdev->saved_raid_disk >= 0 && |
8169 | !test_bit(Bitmap_sync, &rdev->flags))) | |
7ceb17e8 N |
8170 | continue; |
8171 | ||
d01552a7 | 8172 | rdev->recovery_offset = 0; |
7ceb17e8 N |
8173 | if (mddev->pers-> |
8174 | hot_add_disk(mddev, rdev) == 0) { | |
8175 | if (sysfs_link_rdev(mddev, rdev)) | |
8176 | /* failure here is OK */; | |
8177 | spares++; | |
8178 | md_new_event(mddev); | |
8179 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 8180 | } |
b4c4c7b8 | 8181 | } |
746d3207 | 8182 | no_add: |
6dafab6b N |
8183 | if (removed) |
8184 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
8185 | return spares; |
8186 | } | |
7ebc0be7 | 8187 | |
ac05f256 N |
8188 | static void md_start_sync(struct work_struct *ws) |
8189 | { | |
8190 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
c186b128 GR |
8191 | int ret = 0; |
8192 | ||
8193 | if (mddev_is_clustered(mddev)) { | |
8194 | ret = md_cluster_ops->resync_start(mddev); | |
8195 | if (ret) { | |
8196 | mddev->sync_thread = NULL; | |
8197 | goto out; | |
8198 | } | |
8199 | } | |
ac05f256 N |
8200 | |
8201 | mddev->sync_thread = md_register_thread(md_do_sync, | |
8202 | mddev, | |
8203 | "resync"); | |
c186b128 | 8204 | out: |
ac05f256 | 8205 | if (!mddev->sync_thread) { |
c186b128 GR |
8206 | if (!(mddev_is_clustered(mddev) && ret == -EAGAIN)) |
8207 | printk(KERN_ERR "%s: could not start resync" | |
8208 | " thread...\n", | |
8209 | mdname(mddev)); | |
ac05f256 N |
8210 | /* leave the spares where they are, it shouldn't hurt */ |
8211 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
8212 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8213 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8214 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
8215 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8216 | wake_up(&resync_wait); |
ac05f256 N |
8217 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8218 | &mddev->recovery)) | |
8219 | if (mddev->sysfs_action) | |
8220 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8221 | } else | |
8222 | md_wakeup_thread(mddev->sync_thread); | |
8223 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8224 | md_new_event(mddev); | |
8225 | } | |
8226 | ||
1da177e4 LT |
8227 | /* |
8228 | * This routine is regularly called by all per-raid-array threads to | |
8229 | * deal with generic issues like resync and super-block update. | |
8230 | * Raid personalities that don't have a thread (linear/raid0) do not | |
8231 | * need this as they never do any recovery or update the superblock. | |
8232 | * | |
8233 | * It does not do any resync itself, but rather "forks" off other threads | |
8234 | * to do that as needed. | |
8235 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
8236 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 8237 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
8238 | * and wakeups up this thread which will reap the thread and finish up. |
8239 | * This thread also removes any faulty devices (with nr_pending == 0). | |
8240 | * | |
8241 | * The overall approach is: | |
8242 | * 1/ if the superblock needs updating, update it. | |
8243 | * 2/ If a recovery thread is running, don't do anything else. | |
8244 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
8245 | * 4/ If there are any faulty devices, remove them. | |
8246 | * 5/ If array is degraded, try to add spares devices | |
8247 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
8248 | */ | |
fd01b88c | 8249 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 8250 | { |
68866e42 JB |
8251 | if (mddev->suspended) |
8252 | return; | |
8253 | ||
5f40402d | 8254 | if (mddev->bitmap) |
aa5cbd10 | 8255 | bitmap_daemon_work(mddev); |
1da177e4 | 8256 | |
fca4d848 | 8257 | if (signal_pending(current)) { |
31a59e34 | 8258 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
8259 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
8260 | mdname(mddev)); | |
8261 | mddev->safemode = 2; | |
8262 | } | |
8263 | flush_signals(current); | |
8264 | } | |
8265 | ||
c89a8eee N |
8266 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
8267 | return; | |
1da177e4 | 8268 | if ( ! ( |
142d44c3 | 8269 | (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 8270 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 8271 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 8272 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
8273 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
8274 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
8275 | )) |
8276 | return; | |
fca4d848 | 8277 | |
df5b89b3 | 8278 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 8279 | int spares = 0; |
fca4d848 | 8280 | |
c89a8eee | 8281 | if (mddev->ro) { |
ab16bfc7 NB |
8282 | struct md_rdev *rdev; |
8283 | if (!mddev->external && mddev->in_sync) | |
8284 | /* 'Blocked' flag not needed as failed devices | |
8285 | * will be recorded if array switched to read/write. | |
8286 | * Leaving it set will prevent the device | |
8287 | * from being removed. | |
8288 | */ | |
8289 | rdev_for_each(rdev, mddev) | |
8290 | clear_bit(Blocked, &rdev->flags); | |
7ceb17e8 N |
8291 | /* On a read-only array we can: |
8292 | * - remove failed devices | |
8293 | * - add already-in_sync devices if the array itself | |
8294 | * is in-sync. | |
8295 | * As we only add devices that are already in-sync, | |
8296 | * we can activate the spares immediately. | |
c89a8eee | 8297 | */ |
7ceb17e8 | 8298 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
8299 | /* There is no thread, but we need to call |
8300 | * ->spare_active and clear saved_raid_disk | |
8301 | */ | |
2ac295a5 | 8302 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 | 8303 | md_reap_sync_thread(mddev); |
a4a3d26d | 8304 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
8313b8e5 | 8305 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
d4929add | 8306 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
c89a8eee N |
8307 | goto unlock; |
8308 | } | |
8309 | ||
31a59e34 | 8310 | if (!mddev->external) { |
0fd62b86 | 8311 | int did_change = 0; |
85572d7c | 8312 | spin_lock(&mddev->lock); |
31a59e34 N |
8313 | if (mddev->safemode && |
8314 | !atomic_read(&mddev->writes_pending) && | |
8315 | !mddev->in_sync && | |
8316 | mddev->recovery_cp == MaxSector) { | |
8317 | mddev->in_sync = 1; | |
0fd62b86 | 8318 | did_change = 1; |
070dc6dd | 8319 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
8320 | } |
8321 | if (mddev->safemode == 1) | |
8322 | mddev->safemode = 0; | |
85572d7c | 8323 | spin_unlock(&mddev->lock); |
0fd62b86 | 8324 | if (did_change) |
00bcb4ac | 8325 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 8326 | } |
fca4d848 | 8327 | |
2aa82191 | 8328 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 8329 | md_update_sb(mddev, 0); |
06d91a5f | 8330 | |
1da177e4 LT |
8331 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
8332 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
8333 | /* resync/recovery still happening */ | |
8334 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8335 | goto unlock; | |
8336 | } | |
8337 | if (mddev->sync_thread) { | |
a91d5ac0 | 8338 | md_reap_sync_thread(mddev); |
1da177e4 LT |
8339 | goto unlock; |
8340 | } | |
72a23c21 NB |
8341 | /* Set RUNNING before clearing NEEDED to avoid |
8342 | * any transients in the value of "sync_action". | |
8343 | */ | |
72f36d59 | 8344 | mddev->curr_resync_completed = 0; |
23da422b | 8345 | spin_lock(&mddev->lock); |
72a23c21 | 8346 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
23da422b | 8347 | spin_unlock(&mddev->lock); |
24dd469d N |
8348 | /* Clear some bits that don't mean anything, but |
8349 | * might be left set | |
8350 | */ | |
24dd469d N |
8351 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8352 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 8353 | |
ed209584 N |
8354 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
8355 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 8356 | goto not_running; |
1da177e4 LT |
8357 | /* no recovery is running. |
8358 | * remove any failed drives, then | |
8359 | * add spares if possible. | |
72f36d59 | 8360 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
8361 | * the personality to fail the re-add. |
8362 | */ | |
1da177e4 | 8363 | |
b4c4c7b8 | 8364 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
8365 | if (mddev->pers->check_reshape == NULL || |
8366 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 8367 | /* Cannot proceed */ |
ac05f256 | 8368 | goto not_running; |
b4c4c7b8 | 8369 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 8370 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 8371 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
8372 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8373 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 8374 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 8375 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8376 | } else if (mddev->recovery_cp < MaxSector) { |
8377 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 8378 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8379 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
8380 | /* nothing to be done ... */ | |
ac05f256 | 8381 | goto not_running; |
24dd469d | 8382 | |
1da177e4 | 8383 | if (mddev->pers->sync_request) { |
ef99bf48 | 8384 | if (spares) { |
a654b9d8 N |
8385 | /* We are adding a device or devices to an array |
8386 | * which has the bitmap stored on all devices. | |
8387 | * So make sure all bitmap pages get written | |
8388 | */ | |
8389 | bitmap_write_all(mddev->bitmap); | |
8390 | } | |
ac05f256 N |
8391 | INIT_WORK(&mddev->del_work, md_start_sync); |
8392 | queue_work(md_misc_wq, &mddev->del_work); | |
8393 | goto unlock; | |
1da177e4 | 8394 | } |
ac05f256 | 8395 | not_running: |
72a23c21 NB |
8396 | if (!mddev->sync_thread) { |
8397 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8398 | wake_up(&resync_wait); |
72a23c21 NB |
8399 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8400 | &mddev->recovery)) | |
0c3573f1 | 8401 | if (mddev->sysfs_action) |
00bcb4ac | 8402 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 8403 | } |
ac05f256 N |
8404 | unlock: |
8405 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
8406 | mddev_unlock(mddev); |
8407 | } | |
8408 | } | |
6c144d31 | 8409 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 8410 | |
a91d5ac0 JB |
8411 | void md_reap_sync_thread(struct mddev *mddev) |
8412 | { | |
8413 | struct md_rdev *rdev; | |
8414 | ||
8415 | /* resync has finished, collect result */ | |
8416 | md_unregister_thread(&mddev->sync_thread); | |
8417 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8418 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
8419 | /* success...*/ | |
8420 | /* activate any spares */ | |
8421 | if (mddev->pers->spare_active(mddev)) { | |
8422 | sysfs_notify(&mddev->kobj, NULL, | |
8423 | "degraded"); | |
8424 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
8425 | } | |
8426 | } | |
8427 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
8428 | mddev->pers->finish_reshape) | |
8429 | mddev->pers->finish_reshape(mddev); | |
8430 | ||
8431 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 8432 | * information must be scrapped. |
a91d5ac0 | 8433 | */ |
f466722c N |
8434 | if (!mddev->degraded) |
8435 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
8436 | rdev->saved_raid_disk = -1; |
8437 | ||
8438 | md_update_sb(mddev, 1); | |
8439 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
ea358cd0 | 8440 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
a91d5ac0 JB |
8441 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8442 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8443 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8444 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 8445 | wake_up(&resync_wait); |
a91d5ac0 JB |
8446 | /* flag recovery needed just to double check */ |
8447 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8448 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8449 | md_new_event(mddev); | |
8450 | if (mddev->event_work.func) | |
8451 | queue_work(md_misc_wq, &mddev->event_work); | |
8452 | } | |
6c144d31 | 8453 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 8454 | |
fd01b88c | 8455 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 8456 | { |
00bcb4ac | 8457 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 8458 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
8459 | !test_bit(Blocked, &rdev->flags) && |
8460 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
8461 | msecs_to_jiffies(5000)); |
8462 | rdev_dec_pending(rdev, mddev); | |
8463 | } | |
8464 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
8465 | ||
c6563a8c N |
8466 | void md_finish_reshape(struct mddev *mddev) |
8467 | { | |
8468 | /* called be personality module when reshape completes. */ | |
8469 | struct md_rdev *rdev; | |
8470 | ||
8471 | rdev_for_each(rdev, mddev) { | |
8472 | if (rdev->data_offset > rdev->new_data_offset) | |
8473 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
8474 | else | |
8475 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
8476 | rdev->data_offset = rdev->new_data_offset; | |
8477 | } | |
8478 | } | |
8479 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
8480 | |
8481 | /* Bad block management. | |
8482 | * We can record which blocks on each device are 'bad' and so just | |
8483 | * fail those blocks, or that stripe, rather than the whole device. | |
8484 | * Entries in the bad-block table are 64bits wide. This comprises: | |
8485 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
8486 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
8487 | * A 'shift' can be set so that larger blocks are tracked and | |
8488 | * consequently larger devices can be covered. | |
8489 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
8490 | * | |
8491 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
8492 | * might need to retry if it is very unlucky. | |
8493 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
8494 | * so we use the write_seqlock_irq variant. | |
8495 | * | |
8496 | * When looking for a bad block we specify a range and want to | |
8497 | * know if any block in the range is bad. So we binary-search | |
8498 | * to the last range that starts at-or-before the given endpoint, | |
8499 | * (or "before the sector after the target range") | |
8500 | * then see if it ends after the given start. | |
8501 | * We return | |
8502 | * 0 if there are no known bad blocks in the range | |
8503 | * 1 if there are known bad block which are all acknowledged | |
8504 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
8505 | * plus the start/length of the first bad section we overlap. | |
8506 | */ | |
8507 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
8508 | sector_t *first_bad, int *bad_sectors) | |
8509 | { | |
8510 | int hi; | |
ab05613a | 8511 | int lo; |
2230dfe4 | 8512 | u64 *p = bb->page; |
ab05613a | 8513 | int rv; |
2230dfe4 N |
8514 | sector_t target = s + sectors; |
8515 | unsigned seq; | |
8516 | ||
8517 | if (bb->shift > 0) { | |
8518 | /* round the start down, and the end up */ | |
8519 | s >>= bb->shift; | |
8520 | target += (1<<bb->shift) - 1; | |
8521 | target >>= bb->shift; | |
8522 | sectors = target - s; | |
8523 | } | |
8524 | /* 'target' is now the first block after the bad range */ | |
8525 | ||
8526 | retry: | |
8527 | seq = read_seqbegin(&bb->lock); | |
ab05613a | 8528 | lo = 0; |
8529 | rv = 0; | |
2230dfe4 N |
8530 | hi = bb->count; |
8531 | ||
8532 | /* Binary search between lo and hi for 'target' | |
8533 | * i.e. for the last range that starts before 'target' | |
8534 | */ | |
8535 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
8536 | * are known not to be the last range before target. | |
8537 | * VARIANT: hi-lo is the number of possible | |
8538 | * ranges, and decreases until it reaches 1 | |
8539 | */ | |
8540 | while (hi - lo > 1) { | |
8541 | int mid = (lo + hi) / 2; | |
8542 | sector_t a = BB_OFFSET(p[mid]); | |
8543 | if (a < target) | |
8544 | /* This could still be the one, earlier ranges | |
8545 | * could not. */ | |
8546 | lo = mid; | |
8547 | else | |
8548 | /* This and later ranges are definitely out. */ | |
8549 | hi = mid; | |
8550 | } | |
8551 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
8552 | if (hi > lo) { | |
8553 | /* need to check all range that end after 's' to see if | |
8554 | * any are unacknowledged. | |
8555 | */ | |
8556 | while (lo >= 0 && | |
8557 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8558 | if (BB_OFFSET(p[lo]) < target) { | |
8559 | /* starts before the end, and finishes after | |
8560 | * the start, so they must overlap | |
8561 | */ | |
8562 | if (rv != -1 && BB_ACK(p[lo])) | |
8563 | rv = 1; | |
8564 | else | |
8565 | rv = -1; | |
8566 | *first_bad = BB_OFFSET(p[lo]); | |
8567 | *bad_sectors = BB_LEN(p[lo]); | |
8568 | } | |
8569 | lo--; | |
8570 | } | |
8571 | } | |
8572 | ||
8573 | if (read_seqretry(&bb->lock, seq)) | |
8574 | goto retry; | |
8575 | ||
8576 | return rv; | |
8577 | } | |
8578 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
8579 | ||
8580 | /* | |
8581 | * Add a range of bad blocks to the table. | |
8582 | * This might extend the table, or might contract it | |
8583 | * if two adjacent ranges can be merged. | |
8584 | * We binary-search to find the 'insertion' point, then | |
8585 | * decide how best to handle it. | |
8586 | */ | |
8587 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
8588 | int acknowledged) | |
8589 | { | |
8590 | u64 *p; | |
8591 | int lo, hi; | |
8592 | int rv = 1; | |
905b0297 | 8593 | unsigned long flags; |
2230dfe4 N |
8594 | |
8595 | if (bb->shift < 0) | |
8596 | /* badblocks are disabled */ | |
8597 | return 0; | |
8598 | ||
8599 | if (bb->shift) { | |
8600 | /* round the start down, and the end up */ | |
8601 | sector_t next = s + sectors; | |
8602 | s >>= bb->shift; | |
8603 | next += (1<<bb->shift) - 1; | |
8604 | next >>= bb->shift; | |
8605 | sectors = next - s; | |
8606 | } | |
8607 | ||
905b0297 | 8608 | write_seqlock_irqsave(&bb->lock, flags); |
2230dfe4 N |
8609 | |
8610 | p = bb->page; | |
8611 | lo = 0; | |
8612 | hi = bb->count; | |
8613 | /* Find the last range that starts at-or-before 's' */ | |
8614 | while (hi - lo > 1) { | |
8615 | int mid = (lo + hi) / 2; | |
8616 | sector_t a = BB_OFFSET(p[mid]); | |
8617 | if (a <= s) | |
8618 | lo = mid; | |
8619 | else | |
8620 | hi = mid; | |
8621 | } | |
8622 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8623 | hi = lo; | |
8624 | ||
8625 | if (hi > lo) { | |
8626 | /* we found a range that might merge with the start | |
8627 | * of our new range | |
8628 | */ | |
8629 | sector_t a = BB_OFFSET(p[lo]); | |
8630 | sector_t e = a + BB_LEN(p[lo]); | |
8631 | int ack = BB_ACK(p[lo]); | |
8632 | if (e >= s) { | |
8633 | /* Yes, we can merge with a previous range */ | |
8634 | if (s == a && s + sectors >= e) | |
8635 | /* new range covers old */ | |
8636 | ack = acknowledged; | |
8637 | else | |
8638 | ack = ack && acknowledged; | |
8639 | ||
8640 | if (e < s + sectors) | |
8641 | e = s + sectors; | |
8642 | if (e - a <= BB_MAX_LEN) { | |
8643 | p[lo] = BB_MAKE(a, e-a, ack); | |
8644 | s = e; | |
8645 | } else { | |
8646 | /* does not all fit in one range, | |
8647 | * make p[lo] maximal | |
8648 | */ | |
8649 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8650 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8651 | s = a + BB_MAX_LEN; | |
8652 | } | |
8653 | sectors = e - s; | |
8654 | } | |
8655 | } | |
8656 | if (sectors && hi < bb->count) { | |
8657 | /* 'hi' points to the first range that starts after 's'. | |
8658 | * Maybe we can merge with the start of that range */ | |
8659 | sector_t a = BB_OFFSET(p[hi]); | |
8660 | sector_t e = a + BB_LEN(p[hi]); | |
8661 | int ack = BB_ACK(p[hi]); | |
8662 | if (a <= s + sectors) { | |
8663 | /* merging is possible */ | |
8664 | if (e <= s + sectors) { | |
8665 | /* full overlap */ | |
8666 | e = s + sectors; | |
8667 | ack = acknowledged; | |
8668 | } else | |
8669 | ack = ack && acknowledged; | |
8670 | ||
8671 | a = s; | |
8672 | if (e - a <= BB_MAX_LEN) { | |
8673 | p[hi] = BB_MAKE(a, e-a, ack); | |
8674 | s = e; | |
8675 | } else { | |
8676 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8677 | s = a + BB_MAX_LEN; | |
8678 | } | |
8679 | sectors = e - s; | |
8680 | lo = hi; | |
8681 | hi++; | |
8682 | } | |
8683 | } | |
8684 | if (sectors == 0 && hi < bb->count) { | |
8685 | /* we might be able to combine lo and hi */ | |
8686 | /* Note: 's' is at the end of 'lo' */ | |
8687 | sector_t a = BB_OFFSET(p[hi]); | |
8688 | int lolen = BB_LEN(p[lo]); | |
8689 | int hilen = BB_LEN(p[hi]); | |
8690 | int newlen = lolen + hilen - (s - a); | |
8691 | if (s >= a && newlen < BB_MAX_LEN) { | |
8692 | /* yes, we can combine them */ | |
8693 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8694 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8695 | memmove(p + hi, p + hi + 1, | |
8696 | (bb->count - hi - 1) * 8); | |
8697 | bb->count--; | |
8698 | } | |
8699 | } | |
8700 | while (sectors) { | |
8701 | /* didn't merge (it all). | |
8702 | * Need to add a range just before 'hi' */ | |
8703 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8704 | /* No room for more */ | |
8705 | rv = 0; | |
8706 | break; | |
8707 | } else { | |
8708 | int this_sectors = sectors; | |
8709 | memmove(p + hi + 1, p + hi, | |
8710 | (bb->count - hi) * 8); | |
8711 | bb->count++; | |
8712 | ||
8713 | if (this_sectors > BB_MAX_LEN) | |
8714 | this_sectors = BB_MAX_LEN; | |
8715 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8716 | sectors -= this_sectors; | |
8717 | s += this_sectors; | |
8718 | } | |
8719 | } | |
8720 | ||
8721 | bb->changed = 1; | |
de393cde N |
8722 | if (!acknowledged) |
8723 | bb->unacked_exist = 1; | |
905b0297 | 8724 | write_sequnlock_irqrestore(&bb->lock, flags); |
2230dfe4 N |
8725 | |
8726 | return rv; | |
8727 | } | |
8728 | ||
3cb03002 | 8729 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8730 | int is_new) |
2230dfe4 | 8731 | { |
c6563a8c N |
8732 | int rv; |
8733 | if (is_new) | |
8734 | s += rdev->new_data_offset; | |
8735 | else | |
8736 | s += rdev->data_offset; | |
8737 | rv = md_set_badblocks(&rdev->badblocks, | |
8738 | s, sectors, 0); | |
2230dfe4 N |
8739 | if (rv) { |
8740 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8741 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 | 8742 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
55ce74d4 | 8743 | set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags); |
2230dfe4 N |
8744 | md_wakeup_thread(rdev->mddev->thread); |
8745 | } | |
8746 | return rv; | |
8747 | } | |
8748 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8749 | ||
8750 | /* | |
8751 | * Remove a range of bad blocks from the table. | |
8752 | * This may involve extending the table if we spilt a region, | |
8753 | * but it must not fail. So if the table becomes full, we just | |
8754 | * drop the remove request. | |
8755 | */ | |
8756 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8757 | { | |
8758 | u64 *p; | |
8759 | int lo, hi; | |
8760 | sector_t target = s + sectors; | |
8761 | int rv = 0; | |
8762 | ||
8763 | if (bb->shift > 0) { | |
8764 | /* When clearing we round the start up and the end down. | |
8765 | * This should not matter as the shift should align with | |
8766 | * the block size and no rounding should ever be needed. | |
8767 | * However it is better the think a block is bad when it | |
8768 | * isn't than to think a block is not bad when it is. | |
8769 | */ | |
8770 | s += (1<<bb->shift) - 1; | |
8771 | s >>= bb->shift; | |
8772 | target >>= bb->shift; | |
8773 | sectors = target - s; | |
8774 | } | |
8775 | ||
8776 | write_seqlock_irq(&bb->lock); | |
8777 | ||
8778 | p = bb->page; | |
8779 | lo = 0; | |
8780 | hi = bb->count; | |
8781 | /* Find the last range that starts before 'target' */ | |
8782 | while (hi - lo > 1) { | |
8783 | int mid = (lo + hi) / 2; | |
8784 | sector_t a = BB_OFFSET(p[mid]); | |
8785 | if (a < target) | |
8786 | lo = mid; | |
8787 | else | |
8788 | hi = mid; | |
8789 | } | |
8790 | if (hi > lo) { | |
8791 | /* p[lo] is the last range that could overlap the | |
8792 | * current range. Earlier ranges could also overlap, | |
8793 | * but only this one can overlap the end of the range. | |
8794 | */ | |
8795 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8796 | /* Partial overlap, leave the tail of this range */ | |
8797 | int ack = BB_ACK(p[lo]); | |
8798 | sector_t a = BB_OFFSET(p[lo]); | |
8799 | sector_t end = a + BB_LEN(p[lo]); | |
8800 | ||
8801 | if (a < s) { | |
8802 | /* we need to split this range */ | |
8803 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8b32bf5e | 8804 | rv = -ENOSPC; |
2230dfe4 N |
8805 | goto out; |
8806 | } | |
8807 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8808 | bb->count++; | |
8809 | p[lo] = BB_MAKE(a, s-a, ack); | |
8810 | lo++; | |
8811 | } | |
8812 | p[lo] = BB_MAKE(target, end - target, ack); | |
8813 | /* there is no longer an overlap */ | |
8814 | hi = lo; | |
8815 | lo--; | |
8816 | } | |
8817 | while (lo >= 0 && | |
8818 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8819 | /* This range does overlap */ | |
8820 | if (BB_OFFSET(p[lo]) < s) { | |
8821 | /* Keep the early parts of this range. */ | |
8822 | int ack = BB_ACK(p[lo]); | |
8823 | sector_t start = BB_OFFSET(p[lo]); | |
8824 | p[lo] = BB_MAKE(start, s - start, ack); | |
8825 | /* now low doesn't overlap, so.. */ | |
8826 | break; | |
8827 | } | |
8828 | lo--; | |
8829 | } | |
8830 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8831 | * anything between needs to be discarded | |
8832 | */ | |
8833 | if (hi - lo > 1) { | |
8834 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8835 | bb->count -= (hi - lo - 1); | |
8836 | } | |
8837 | } | |
8838 | ||
8839 | bb->changed = 1; | |
8840 | out: | |
8841 | write_sequnlock_irq(&bb->lock); | |
8842 | return rv; | |
8843 | } | |
8844 | ||
c6563a8c N |
8845 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8846 | int is_new) | |
2230dfe4 | 8847 | { |
c6563a8c N |
8848 | if (is_new) |
8849 | s += rdev->new_data_offset; | |
8850 | else | |
8851 | s += rdev->data_offset; | |
2230dfe4 | 8852 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8853 | s, sectors); |
2230dfe4 N |
8854 | } |
8855 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8856 | ||
8857 | /* | |
8858 | * Acknowledge all bad blocks in a list. | |
8859 | * This only succeeds if ->changed is clear. It is used by | |
8860 | * in-kernel metadata updates | |
8861 | */ | |
8862 | void md_ack_all_badblocks(struct badblocks *bb) | |
8863 | { | |
8864 | if (bb->page == NULL || bb->changed) | |
8865 | /* no point even trying */ | |
8866 | return; | |
8867 | write_seqlock_irq(&bb->lock); | |
8868 | ||
ecb178bb | 8869 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8870 | u64 *p = bb->page; |
8871 | int i; | |
8872 | for (i = 0; i < bb->count ; i++) { | |
8873 | if (!BB_ACK(p[i])) { | |
8874 | sector_t start = BB_OFFSET(p[i]); | |
8875 | int len = BB_LEN(p[i]); | |
8876 | p[i] = BB_MAKE(start, len, 1); | |
8877 | } | |
8878 | } | |
de393cde | 8879 | bb->unacked_exist = 0; |
2230dfe4 N |
8880 | } |
8881 | write_sequnlock_irq(&bb->lock); | |
8882 | } | |
8883 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8884 | ||
16c791a5 N |
8885 | /* sysfs access to bad-blocks list. |
8886 | * We present two files. | |
8887 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8888 | * are recorded as bad. The list is truncated to fit within | |
8889 | * the one-page limit of sysfs. | |
8890 | * Writing "sector length" to this file adds an acknowledged | |
8891 | * bad block list. | |
8892 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8893 | * been acknowledged. Writing to this file adds bad blocks | |
8894 | * without acknowledging them. This is largely for testing. | |
8895 | */ | |
8896 | ||
8897 | static ssize_t | |
8898 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8899 | { | |
8900 | size_t len; | |
8901 | int i; | |
8902 | u64 *p = bb->page; | |
8903 | unsigned seq; | |
8904 | ||
8905 | if (bb->shift < 0) | |
8906 | return 0; | |
8907 | ||
8908 | retry: | |
8909 | seq = read_seqbegin(&bb->lock); | |
8910 | ||
8911 | len = 0; | |
8912 | i = 0; | |
8913 | ||
8914 | while (len < PAGE_SIZE && i < bb->count) { | |
8915 | sector_t s = BB_OFFSET(p[i]); | |
8916 | unsigned int length = BB_LEN(p[i]); | |
8917 | int ack = BB_ACK(p[i]); | |
8918 | i++; | |
8919 | ||
8920 | if (unack && ack) | |
8921 | continue; | |
8922 | ||
8923 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8924 | (unsigned long long)s << bb->shift, | |
8925 | length << bb->shift); | |
8926 | } | |
de393cde N |
8927 | if (unack && len == 0) |
8928 | bb->unacked_exist = 0; | |
16c791a5 N |
8929 | |
8930 | if (read_seqretry(&bb->lock, seq)) | |
8931 | goto retry; | |
8932 | ||
8933 | return len; | |
8934 | } | |
8935 | ||
8936 | #define DO_DEBUG 1 | |
8937 | ||
8938 | static ssize_t | |
8939 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8940 | { | |
8941 | unsigned long long sector; | |
8942 | int length; | |
8943 | char newline; | |
8944 | #ifdef DO_DEBUG | |
8945 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8946 | * Normally only a successful write may clear a badblock | |
8947 | */ | |
8948 | int clear = 0; | |
8949 | if (page[0] == '-') { | |
8950 | clear = 1; | |
8951 | page++; | |
8952 | } | |
8953 | #endif /* DO_DEBUG */ | |
8954 | ||
8955 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8956 | case 3: | |
8957 | if (newline != '\n') | |
8958 | return -EINVAL; | |
8959 | case 2: | |
8960 | if (length <= 0) | |
8961 | return -EINVAL; | |
8962 | break; | |
8963 | default: | |
8964 | return -EINVAL; | |
8965 | } | |
8966 | ||
8967 | #ifdef DO_DEBUG | |
8968 | if (clear) { | |
8969 | md_clear_badblocks(bb, sector, length); | |
8970 | return len; | |
8971 | } | |
8972 | #endif /* DO_DEBUG */ | |
8973 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8974 | return len; | |
8975 | else | |
8976 | return -ENOSPC; | |
8977 | } | |
8978 | ||
75c96f85 AB |
8979 | static int md_notify_reboot(struct notifier_block *this, |
8980 | unsigned long code, void *x) | |
1da177e4 LT |
8981 | { |
8982 | struct list_head *tmp; | |
fd01b88c | 8983 | struct mddev *mddev; |
2dba6a91 | 8984 | int need_delay = 0; |
1da177e4 | 8985 | |
c744a65c N |
8986 | for_each_mddev(mddev, tmp) { |
8987 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8988 | if (mddev->pers) |
8989 | __md_stop_writes(mddev); | |
0f62fb22 N |
8990 | if (mddev->persistent) |
8991 | mddev->safemode = 2; | |
c744a65c | 8992 | mddev_unlock(mddev); |
2dba6a91 | 8993 | } |
c744a65c | 8994 | need_delay = 1; |
1da177e4 | 8995 | } |
c744a65c N |
8996 | /* |
8997 | * certain more exotic SCSI devices are known to be | |
8998 | * volatile wrt too early system reboots. While the | |
8999 | * right place to handle this issue is the given | |
9000 | * driver, we do want to have a safe RAID driver ... | |
9001 | */ | |
9002 | if (need_delay) | |
9003 | mdelay(1000*1); | |
9004 | ||
1da177e4 LT |
9005 | return NOTIFY_DONE; |
9006 | } | |
9007 | ||
75c96f85 | 9008 | static struct notifier_block md_notifier = { |
1da177e4 LT |
9009 | .notifier_call = md_notify_reboot, |
9010 | .next = NULL, | |
9011 | .priority = INT_MAX, /* before any real devices */ | |
9012 | }; | |
9013 | ||
9014 | static void md_geninit(void) | |
9015 | { | |
36a4e1fe | 9016 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 9017 | |
c7705f34 | 9018 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
9019 | } |
9020 | ||
75c96f85 | 9021 | static int __init md_init(void) |
1da177e4 | 9022 | { |
e804ac78 TH |
9023 | int ret = -ENOMEM; |
9024 | ||
ada609ee | 9025 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
9026 | if (!md_wq) |
9027 | goto err_wq; | |
9028 | ||
9029 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
9030 | if (!md_misc_wq) | |
9031 | goto err_misc_wq; | |
9032 | ||
9033 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
9034 | goto err_md; | |
9035 | ||
9036 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
9037 | goto err_mdp; | |
9038 | mdp_major = ret; | |
9039 | ||
af5628f0 | 9040 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
9041 | md_probe, NULL, NULL); |
9042 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
9043 | md_probe, NULL, NULL); |
9044 | ||
1da177e4 | 9045 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 9046 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
9047 | |
9048 | md_geninit(); | |
d710e138 | 9049 | return 0; |
1da177e4 | 9050 | |
e804ac78 TH |
9051 | err_mdp: |
9052 | unregister_blkdev(MD_MAJOR, "md"); | |
9053 | err_md: | |
9054 | destroy_workqueue(md_misc_wq); | |
9055 | err_misc_wq: | |
9056 | destroy_workqueue(md_wq); | |
9057 | err_wq: | |
9058 | return ret; | |
9059 | } | |
1da177e4 | 9060 | |
70bcecdb | 9061 | static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) |
1d7e3e96 | 9062 | { |
70bcecdb GR |
9063 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
9064 | struct md_rdev *rdev2; | |
9065 | int role, ret; | |
9066 | char b[BDEVNAME_SIZE]; | |
1d7e3e96 | 9067 | |
70bcecdb GR |
9068 | /* Check for change of roles in the active devices */ |
9069 | rdev_for_each(rdev2, mddev) { | |
9070 | if (test_bit(Faulty, &rdev2->flags)) | |
9071 | continue; | |
9072 | ||
9073 | /* Check if the roles changed */ | |
9074 | role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); | |
dbb64f86 GR |
9075 | |
9076 | if (test_bit(Candidate, &rdev2->flags)) { | |
9077 | if (role == 0xfffe) { | |
9078 | pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); | |
9079 | md_kick_rdev_from_array(rdev2); | |
9080 | continue; | |
9081 | } | |
9082 | else | |
9083 | clear_bit(Candidate, &rdev2->flags); | |
9084 | } | |
9085 | ||
70bcecdb GR |
9086 | if (role != rdev2->raid_disk) { |
9087 | /* got activated */ | |
9088 | if (rdev2->raid_disk == -1 && role != 0xffff) { | |
9089 | rdev2->saved_raid_disk = role; | |
9090 | ret = remove_and_add_spares(mddev, rdev2); | |
9091 | pr_info("Activated spare: %s\n", | |
9092 | bdevname(rdev2->bdev,b)); | |
9093 | continue; | |
9094 | } | |
9095 | /* device faulty | |
9096 | * We just want to do the minimum to mark the disk | |
9097 | * as faulty. The recovery is performed by the | |
9098 | * one who initiated the error. | |
9099 | */ | |
9100 | if ((role == 0xfffe) || (role == 0xfffd)) { | |
9101 | md_error(mddev, rdev2); | |
9102 | clear_bit(Blocked, &rdev2->flags); | |
9103 | } | |
9104 | } | |
1d7e3e96 | 9105 | } |
70bcecdb | 9106 | |
28c1b9fd GR |
9107 | if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) |
9108 | update_raid_disks(mddev, le32_to_cpu(sb->raid_disks)); | |
70bcecdb GR |
9109 | |
9110 | /* Finally set the event to be up to date */ | |
9111 | mddev->events = le64_to_cpu(sb->events); | |
9112 | } | |
9113 | ||
9114 | static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) | |
9115 | { | |
9116 | int err; | |
9117 | struct page *swapout = rdev->sb_page; | |
9118 | struct mdp_superblock_1 *sb; | |
9119 | ||
9120 | /* Store the sb page of the rdev in the swapout temporary | |
9121 | * variable in case we err in the future | |
9122 | */ | |
9123 | rdev->sb_page = NULL; | |
9124 | alloc_disk_sb(rdev); | |
9125 | ClearPageUptodate(rdev->sb_page); | |
9126 | rdev->sb_loaded = 0; | |
9127 | err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version); | |
9128 | ||
9129 | if (err < 0) { | |
9130 | pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", | |
9131 | __func__, __LINE__, rdev->desc_nr, err); | |
9132 | put_page(rdev->sb_page); | |
9133 | rdev->sb_page = swapout; | |
9134 | rdev->sb_loaded = 1; | |
9135 | return err; | |
1d7e3e96 GR |
9136 | } |
9137 | ||
70bcecdb GR |
9138 | sb = page_address(rdev->sb_page); |
9139 | /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET | |
9140 | * is not set | |
9141 | */ | |
9142 | ||
9143 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) | |
9144 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
9145 | ||
9146 | /* The other node finished recovery, call spare_active to set | |
9147 | * device In_sync and mddev->degraded | |
9148 | */ | |
9149 | if (rdev->recovery_offset == MaxSector && | |
9150 | !test_bit(In_sync, &rdev->flags) && | |
9151 | mddev->pers->spare_active(mddev)) | |
9152 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
9153 | ||
9154 | put_page(swapout); | |
9155 | return 0; | |
9156 | } | |
9157 | ||
9158 | void md_reload_sb(struct mddev *mddev, int nr) | |
9159 | { | |
9160 | struct md_rdev *rdev; | |
9161 | int err; | |
9162 | ||
9163 | /* Find the rdev */ | |
9164 | rdev_for_each_rcu(rdev, mddev) { | |
9165 | if (rdev->desc_nr == nr) | |
9166 | break; | |
9167 | } | |
9168 | ||
9169 | if (!rdev || rdev->desc_nr != nr) { | |
9170 | pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); | |
9171 | return; | |
9172 | } | |
9173 | ||
9174 | err = read_rdev(mddev, rdev); | |
9175 | if (err < 0) | |
9176 | return; | |
9177 | ||
9178 | check_sb_changes(mddev, rdev); | |
9179 | ||
9180 | /* Read all rdev's to update recovery_offset */ | |
9181 | rdev_for_each_rcu(rdev, mddev) | |
9182 | read_rdev(mddev, rdev); | |
1d7e3e96 GR |
9183 | } |
9184 | EXPORT_SYMBOL(md_reload_sb); | |
9185 | ||
1da177e4 LT |
9186 | #ifndef MODULE |
9187 | ||
9188 | /* | |
9189 | * Searches all registered partitions for autorun RAID arrays | |
9190 | * at boot time. | |
9191 | */ | |
4d936ec1 ME |
9192 | |
9193 | static LIST_HEAD(all_detected_devices); | |
9194 | struct detected_devices_node { | |
9195 | struct list_head list; | |
9196 | dev_t dev; | |
9197 | }; | |
1da177e4 LT |
9198 | |
9199 | void md_autodetect_dev(dev_t dev) | |
9200 | { | |
4d936ec1 ME |
9201 | struct detected_devices_node *node_detected_dev; |
9202 | ||
9203 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
9204 | if (node_detected_dev) { | |
9205 | node_detected_dev->dev = dev; | |
9206 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
9207 | } else { | |
9208 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
9209 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
9210 | } | |
1da177e4 LT |
9211 | } |
9212 | ||
1da177e4 LT |
9213 | static void autostart_arrays(int part) |
9214 | { | |
3cb03002 | 9215 | struct md_rdev *rdev; |
4d936ec1 ME |
9216 | struct detected_devices_node *node_detected_dev; |
9217 | dev_t dev; | |
9218 | int i_scanned, i_passed; | |
1da177e4 | 9219 | |
4d936ec1 ME |
9220 | i_scanned = 0; |
9221 | i_passed = 0; | |
1da177e4 | 9222 | |
4d936ec1 | 9223 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 9224 | |
4d936ec1 ME |
9225 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
9226 | i_scanned++; | |
9227 | node_detected_dev = list_entry(all_detected_devices.next, | |
9228 | struct detected_devices_node, list); | |
9229 | list_del(&node_detected_dev->list); | |
9230 | dev = node_detected_dev->dev; | |
9231 | kfree(node_detected_dev); | |
df968c4e | 9232 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
9233 | if (IS_ERR(rdev)) |
9234 | continue; | |
9235 | ||
403df478 | 9236 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 9237 | continue; |
403df478 | 9238 | |
d0fae18f | 9239 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 9240 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 9241 | i_passed++; |
1da177e4 | 9242 | } |
4d936ec1 ME |
9243 | |
9244 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
9245 | i_scanned, i_passed); | |
1da177e4 LT |
9246 | |
9247 | autorun_devices(part); | |
9248 | } | |
9249 | ||
fdee8ae4 | 9250 | #endif /* !MODULE */ |
1da177e4 LT |
9251 | |
9252 | static __exit void md_exit(void) | |
9253 | { | |
fd01b88c | 9254 | struct mddev *mddev; |
1da177e4 | 9255 | struct list_head *tmp; |
e2f23b60 | 9256 | int delay = 1; |
8ab5e4c1 | 9257 | |
af5628f0 | 9258 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 9259 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 9260 | |
3dbd8c2e | 9261 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
9262 | unregister_blkdev(mdp_major, "mdp"); |
9263 | unregister_reboot_notifier(&md_notifier); | |
9264 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
9265 | |
9266 | /* We cannot unload the modules while some process is | |
9267 | * waiting for us in select() or poll() - wake them up | |
9268 | */ | |
9269 | md_unloading = 1; | |
9270 | while (waitqueue_active(&md_event_waiters)) { | |
9271 | /* not safe to leave yet */ | |
9272 | wake_up(&md_event_waiters); | |
9273 | msleep(delay); | |
9274 | delay += delay; | |
9275 | } | |
1da177e4 | 9276 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 9277 | |
29ac4aa3 | 9278 | for_each_mddev(mddev, tmp) { |
1da177e4 | 9279 | export_array(mddev); |
d3374825 | 9280 | mddev->hold_active = 0; |
1da177e4 | 9281 | } |
e804ac78 TH |
9282 | destroy_workqueue(md_misc_wq); |
9283 | destroy_workqueue(md_wq); | |
1da177e4 LT |
9284 | } |
9285 | ||
685784aa | 9286 | subsys_initcall(md_init); |
1da177e4 LT |
9287 | module_exit(md_exit) |
9288 | ||
f91de92e N |
9289 | static int get_ro(char *buffer, struct kernel_param *kp) |
9290 | { | |
9291 | return sprintf(buffer, "%d", start_readonly); | |
9292 | } | |
9293 | static int set_ro(const char *val, struct kernel_param *kp) | |
9294 | { | |
4c9309c0 | 9295 | return kstrtouint(val, 10, (unsigned int *)&start_readonly); |
f91de92e N |
9296 | } |
9297 | ||
80ca3a44 N |
9298 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
9299 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 9300 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 9301 | |
1da177e4 | 9302 | MODULE_LICENSE("GPL"); |
0efb9e61 | 9303 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 9304 | MODULE_ALIAS("md"); |
72008652 | 9305 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |