Commit | Line | Data |
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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 GR |
70 | struct md_cluster_operations *md_cluster_ops; |
71 | struct module *md_cluster_mod; | |
72 | EXPORT_SYMBOL(md_cluster_mod); | |
73 | ||
90b08710 | 74 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
75 | static struct workqueue_struct *md_wq; |
76 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 77 | |
746d3207 N |
78 | static int remove_and_add_spares(struct mddev *mddev, |
79 | struct md_rdev *this); | |
5aa61f42 | 80 | static void mddev_detach(struct mddev *mddev); |
746d3207 | 81 | |
1e50915f RB |
82 | /* |
83 | * Default number of read corrections we'll attempt on an rdev | |
84 | * before ejecting it from the array. We divide the read error | |
85 | * count by 2 for every hour elapsed between read errors. | |
86 | */ | |
87 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
88 | /* |
89 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
90 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
91 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 92 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
93 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
94 | * speed limit - in case reconstruction slows down your system despite | |
95 | * idle IO detection. | |
96 | * | |
97 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 98 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
99 | */ |
100 | ||
101 | static int sysctl_speed_limit_min = 1000; | |
102 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 103 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
104 | { |
105 | return mddev->sync_speed_min ? | |
106 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
107 | } | |
108 | ||
fd01b88c | 109 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
110 | { |
111 | return mddev->sync_speed_max ? | |
112 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
113 | } | |
1da177e4 LT |
114 | |
115 | static struct ctl_table_header *raid_table_header; | |
116 | ||
82592c38 | 117 | static struct ctl_table raid_table[] = { |
1da177e4 | 118 | { |
1da177e4 LT |
119 | .procname = "speed_limit_min", |
120 | .data = &sysctl_speed_limit_min, | |
121 | .maxlen = sizeof(int), | |
80ca3a44 | 122 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 123 | .proc_handler = proc_dointvec, |
1da177e4 LT |
124 | }, |
125 | { | |
1da177e4 LT |
126 | .procname = "speed_limit_max", |
127 | .data = &sysctl_speed_limit_max, | |
128 | .maxlen = sizeof(int), | |
80ca3a44 | 129 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 130 | .proc_handler = proc_dointvec, |
1da177e4 | 131 | }, |
894d2491 | 132 | { } |
1da177e4 LT |
133 | }; |
134 | ||
82592c38 | 135 | static struct ctl_table raid_dir_table[] = { |
1da177e4 | 136 | { |
1da177e4 LT |
137 | .procname = "raid", |
138 | .maxlen = 0, | |
80ca3a44 | 139 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
140 | .child = raid_table, |
141 | }, | |
894d2491 | 142 | { } |
1da177e4 LT |
143 | }; |
144 | ||
82592c38 | 145 | static struct ctl_table raid_root_table[] = { |
1da177e4 | 146 | { |
1da177e4 LT |
147 | .procname = "dev", |
148 | .maxlen = 0, | |
149 | .mode = 0555, | |
150 | .child = raid_dir_table, | |
151 | }, | |
894d2491 | 152 | { } |
1da177e4 LT |
153 | }; |
154 | ||
83d5cde4 | 155 | static const struct block_device_operations md_fops; |
1da177e4 | 156 | |
f91de92e N |
157 | static int start_readonly; |
158 | ||
a167f663 N |
159 | /* bio_clone_mddev |
160 | * like bio_clone, but with a local bio set | |
161 | */ | |
162 | ||
a167f663 | 163 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 164 | struct mddev *mddev) |
a167f663 N |
165 | { |
166 | struct bio *b; | |
a167f663 N |
167 | |
168 | if (!mddev || !mddev->bio_set) | |
169 | return bio_alloc(gfp_mask, nr_iovecs); | |
170 | ||
395c72a7 | 171 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
172 | if (!b) |
173 | return NULL; | |
a167f663 N |
174 | return b; |
175 | } | |
176 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
177 | ||
178 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 179 | struct mddev *mddev) |
a167f663 | 180 | { |
a167f663 N |
181 | if (!mddev || !mddev->bio_set) |
182 | return bio_clone(bio, gfp_mask); | |
183 | ||
bf800ef1 | 184 | return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
a167f663 N |
185 | } |
186 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
187 | ||
d7603b7e N |
188 | /* |
189 | * We have a system wide 'event count' that is incremented | |
190 | * on any 'interesting' event, and readers of /proc/mdstat | |
191 | * can use 'poll' or 'select' to find out when the event | |
192 | * count increases. | |
193 | * | |
194 | * Events are: | |
195 | * start array, stop array, error, add device, remove device, | |
196 | * start build, activate spare | |
197 | */ | |
2989ddbd | 198 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 199 | static atomic_t md_event_count; |
fd01b88c | 200 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
201 | { |
202 | atomic_inc(&md_event_count); | |
203 | wake_up(&md_event_waiters); | |
204 | } | |
29269553 | 205 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 206 | |
c331eb04 N |
207 | /* Alternate version that can be called from interrupts |
208 | * when calling sysfs_notify isn't needed. | |
209 | */ | |
fd01b88c | 210 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
211 | { |
212 | atomic_inc(&md_event_count); | |
213 | wake_up(&md_event_waiters); | |
214 | } | |
215 | ||
1da177e4 LT |
216 | /* |
217 | * Enables to iterate over all existing md arrays | |
218 | * all_mddevs_lock protects this list. | |
219 | */ | |
220 | static LIST_HEAD(all_mddevs); | |
221 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
222 | ||
1da177e4 LT |
223 | /* |
224 | * iterates through all used mddevs in the system. | |
225 | * We take care to grab the all_mddevs_lock whenever navigating | |
226 | * the list, and to always hold a refcount when unlocked. | |
227 | * Any code which breaks out of this loop while own | |
228 | * a reference to the current mddev and must mddev_put it. | |
229 | */ | |
fd01b88c | 230 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 | 231 | \ |
f72ffdd6 | 232 | for (({ spin_lock(&all_mddevs_lock); \ |
fd01b88c N |
233 | _tmp = all_mddevs.next; \ |
234 | _mddev = NULL;}); \ | |
235 | ({ if (_tmp != &all_mddevs) \ | |
236 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 237 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
238 | if (_mddev) mddev_put(_mddev); \ |
239 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
240 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 241 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 242 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
243 | ) |
244 | ||
409c57f3 N |
245 | /* Rather than calling directly into the personality make_request function, |
246 | * IO requests come here first so that we can check if the device is | |
247 | * being suspended pending a reconfiguration. | |
248 | * We hold a refcount over the call to ->make_request. By the time that | |
249 | * call has finished, the bio has been linked into some internal structure | |
250 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
251 | */ | |
5a7bbad2 | 252 | static void md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 253 | { |
49077326 | 254 | const int rw = bio_data_dir(bio); |
fd01b88c | 255 | struct mddev *mddev = q->queuedata; |
e91ece55 | 256 | unsigned int sectors; |
49077326 | 257 | |
0ca69886 N |
258 | if (mddev == NULL || mddev->pers == NULL |
259 | || !mddev->ready) { | |
409c57f3 | 260 | bio_io_error(bio); |
5a7bbad2 | 261 | return; |
409c57f3 | 262 | } |
bbfa57c0 SR |
263 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
264 | bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS); | |
265 | return; | |
266 | } | |
0ca69886 | 267 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 268 | rcu_read_lock(); |
e9c7469b | 269 | if (mddev->suspended) { |
409c57f3 N |
270 | DEFINE_WAIT(__wait); |
271 | for (;;) { | |
272 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
273 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 274 | if (!mddev->suspended) |
409c57f3 N |
275 | break; |
276 | rcu_read_unlock(); | |
277 | schedule(); | |
278 | rcu_read_lock(); | |
279 | } | |
280 | finish_wait(&mddev->sb_wait, &__wait); | |
281 | } | |
282 | atomic_inc(&mddev->active_io); | |
283 | rcu_read_unlock(); | |
49077326 | 284 | |
e91ece55 CM |
285 | /* |
286 | * save the sectors now since our bio can | |
287 | * go away inside make_request | |
288 | */ | |
289 | sectors = bio_sectors(bio); | |
5a7bbad2 | 290 | mddev->pers->make_request(mddev, bio); |
49077326 | 291 | |
18c0b223 | 292 | generic_start_io_acct(rw, sectors, &mddev->gendisk->part0); |
49077326 | 293 | |
409c57f3 N |
294 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
295 | wake_up(&mddev->sb_wait); | |
409c57f3 N |
296 | } |
297 | ||
9e35b99c N |
298 | /* mddev_suspend makes sure no new requests are submitted |
299 | * to the device, and that any requests that have been submitted | |
300 | * are completely handled. | |
afa0f557 N |
301 | * Once mddev_detach() is called and completes, the module will be |
302 | * completely unused. | |
9e35b99c | 303 | */ |
fd01b88c | 304 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
305 | { |
306 | BUG_ON(mddev->suspended); | |
307 | mddev->suspended = 1; | |
308 | synchronize_rcu(); | |
309 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
310 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
311 | |
312 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 313 | } |
390ee602 | 314 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 315 | |
fd01b88c | 316 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
317 | { |
318 | mddev->suspended = 0; | |
319 | wake_up(&mddev->sb_wait); | |
320 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 321 | |
47525e59 | 322 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
323 | md_wakeup_thread(mddev->thread); |
324 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 325 | } |
390ee602 | 326 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 327 | |
fd01b88c | 328 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 | 329 | { |
5c675f83 N |
330 | struct md_personality *pers = mddev->pers; |
331 | int ret = 0; | |
332 | ||
333 | rcu_read_lock(); | |
334 | if (mddev->suspended) | |
335 | ret = 1; | |
336 | else if (pers && pers->congested) | |
337 | ret = pers->congested(mddev, bits); | |
338 | rcu_read_unlock(); | |
339 | return ret; | |
340 | } | |
341 | EXPORT_SYMBOL_GPL(mddev_congested); | |
342 | static int md_congested(void *data, int bits) | |
343 | { | |
344 | struct mddev *mddev = data; | |
345 | return mddev_congested(mddev, bits); | |
3fa841d7 | 346 | } |
3fa841d7 | 347 | |
64590f45 N |
348 | static int md_mergeable_bvec(struct request_queue *q, |
349 | struct bvec_merge_data *bvm, | |
350 | struct bio_vec *biovec) | |
351 | { | |
352 | struct mddev *mddev = q->queuedata; | |
353 | int ret; | |
354 | rcu_read_lock(); | |
355 | if (mddev->suspended) { | |
356 | /* Must always allow one vec */ | |
357 | if (bvm->bi_size == 0) | |
358 | ret = biovec->bv_len; | |
359 | else | |
360 | ret = 0; | |
361 | } else { | |
362 | struct md_personality *pers = mddev->pers; | |
363 | if (pers && pers->mergeable_bvec) | |
364 | ret = pers->mergeable_bvec(mddev, bvm, biovec); | |
365 | else | |
366 | ret = biovec->bv_len; | |
367 | } | |
368 | rcu_read_unlock(); | |
369 | return ret; | |
370 | } | |
a2826aa9 | 371 | /* |
e9c7469b | 372 | * Generic flush handling for md |
a2826aa9 N |
373 | */ |
374 | ||
e9c7469b | 375 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 | 376 | { |
3cb03002 | 377 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 378 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
379 | |
380 | rdev_dec_pending(rdev, mddev); | |
381 | ||
382 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 383 | /* The pre-request flush has finished */ |
e804ac78 | 384 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
385 | } |
386 | bio_put(bio); | |
387 | } | |
388 | ||
a7a07e69 N |
389 | static void md_submit_flush_data(struct work_struct *ws); |
390 | ||
a035fc3e | 391 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 392 | { |
fd01b88c | 393 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 394 | struct md_rdev *rdev; |
a2826aa9 | 395 | |
a7a07e69 N |
396 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
397 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 398 | rcu_read_lock(); |
dafb20fa | 399 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
400 | if (rdev->raid_disk >= 0 && |
401 | !test_bit(Faulty, &rdev->flags)) { | |
402 | /* Take two references, one is dropped | |
403 | * when request finishes, one after | |
404 | * we reclaim rcu_read_lock | |
405 | */ | |
406 | struct bio *bi; | |
407 | atomic_inc(&rdev->nr_pending); | |
408 | atomic_inc(&rdev->nr_pending); | |
409 | rcu_read_unlock(); | |
b5e1b8ce | 410 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 411 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
412 | bi->bi_private = rdev; |
413 | bi->bi_bdev = rdev->bdev; | |
414 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 415 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
416 | rcu_read_lock(); |
417 | rdev_dec_pending(rdev, mddev); | |
418 | } | |
419 | rcu_read_unlock(); | |
a7a07e69 N |
420 | if (atomic_dec_and_test(&mddev->flush_pending)) |
421 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
422 | } |
423 | ||
e9c7469b | 424 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 425 | { |
fd01b88c | 426 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 427 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 428 | |
4f024f37 | 429 | if (bio->bi_iter.bi_size == 0) |
a2826aa9 N |
430 | /* an empty barrier - all done */ |
431 | bio_endio(bio, 0); | |
432 | else { | |
e9c7469b | 433 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 434 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 435 | } |
2b74e12e N |
436 | |
437 | mddev->flush_bio = NULL; | |
438 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
439 | } |
440 | ||
fd01b88c | 441 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 | 442 | { |
85572d7c | 443 | spin_lock_irq(&mddev->lock); |
a2826aa9 | 444 | wait_event_lock_irq(mddev->sb_wait, |
e9c7469b | 445 | !mddev->flush_bio, |
85572d7c | 446 | mddev->lock); |
e9c7469b | 447 | mddev->flush_bio = bio; |
85572d7c | 448 | spin_unlock_irq(&mddev->lock); |
a2826aa9 | 449 | |
a035fc3e N |
450 | INIT_WORK(&mddev->flush_work, submit_flushes); |
451 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 452 | } |
e9c7469b | 453 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 454 | |
74018dc3 | 455 | void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
97658cdd | 456 | { |
9cbb1750 N |
457 | struct mddev *mddev = cb->data; |
458 | md_wakeup_thread(mddev->thread); | |
459 | kfree(cb); | |
97658cdd | 460 | } |
9cbb1750 | 461 | EXPORT_SYMBOL(md_unplug); |
2ac87401 | 462 | |
fd01b88c | 463 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
464 | { |
465 | atomic_inc(&mddev->active); | |
466 | return mddev; | |
467 | } | |
468 | ||
5fd3a17e | 469 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 470 | |
fd01b88c | 471 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 472 | { |
a167f663 N |
473 | struct bio_set *bs = NULL; |
474 | ||
1da177e4 LT |
475 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
476 | return; | |
d3374825 | 477 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
478 | mddev->ctime == 0 && !mddev->hold_active) { |
479 | /* Array is not configured at all, and not held active, | |
480 | * so destroy it */ | |
af8a2434 | 481 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
482 | bs = mddev->bio_set; |
483 | mddev->bio_set = NULL; | |
d3374825 | 484 | if (mddev->gendisk) { |
e804ac78 TH |
485 | /* We did a probe so need to clean up. Call |
486 | * queue_work inside the spinlock so that | |
487 | * flush_workqueue() after mddev_find will | |
488 | * succeed in waiting for the work to be done. | |
d3374825 N |
489 | */ |
490 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 491 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
492 | } else |
493 | kfree(mddev); | |
494 | } | |
495 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
496 | if (bs) |
497 | bioset_free(bs); | |
1da177e4 LT |
498 | } |
499 | ||
fd01b88c | 500 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
501 | { |
502 | mutex_init(&mddev->open_mutex); | |
503 | mutex_init(&mddev->reconfig_mutex); | |
504 | mutex_init(&mddev->bitmap_info.mutex); | |
505 | INIT_LIST_HEAD(&mddev->disks); | |
506 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
507 | init_timer(&mddev->safemode_timer); | |
508 | atomic_set(&mddev->active, 1); | |
509 | atomic_set(&mddev->openers, 0); | |
510 | atomic_set(&mddev->active_io, 0); | |
85572d7c | 511 | spin_lock_init(&mddev->lock); |
fafd7fb0 N |
512 | atomic_set(&mddev->flush_pending, 0); |
513 | init_waitqueue_head(&mddev->sb_wait); | |
514 | init_waitqueue_head(&mddev->recovery_wait); | |
515 | mddev->reshape_position = MaxSector; | |
2c810cdd | 516 | mddev->reshape_backwards = 0; |
c4a39551 | 517 | mddev->last_sync_action = "none"; |
fafd7fb0 N |
518 | mddev->resync_min = 0; |
519 | mddev->resync_max = MaxSector; | |
520 | mddev->level = LEVEL_NONE; | |
521 | } | |
390ee602 | 522 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 523 | |
f72ffdd6 | 524 | static struct mddev *mddev_find(dev_t unit) |
1da177e4 | 525 | { |
fd01b88c | 526 | struct mddev *mddev, *new = NULL; |
1da177e4 | 527 | |
8f5f02c4 N |
528 | if (unit && MAJOR(unit) != MD_MAJOR) |
529 | unit &= ~((1<<MdpMinorShift)-1); | |
530 | ||
1da177e4 LT |
531 | retry: |
532 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
533 | |
534 | if (unit) { | |
535 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
536 | if (mddev->unit == unit) { | |
537 | mddev_get(mddev); | |
538 | spin_unlock(&all_mddevs_lock); | |
539 | kfree(new); | |
540 | return mddev; | |
541 | } | |
542 | ||
543 | if (new) { | |
544 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 545 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
546 | new->hold_active = UNTIL_IOCTL; |
547 | return new; | |
1da177e4 | 548 | } |
efeb53c0 N |
549 | } else if (new) { |
550 | /* find an unused unit number */ | |
551 | static int next_minor = 512; | |
552 | int start = next_minor; | |
553 | int is_free = 0; | |
554 | int dev = 0; | |
555 | while (!is_free) { | |
556 | dev = MKDEV(MD_MAJOR, next_minor); | |
557 | next_minor++; | |
558 | if (next_minor > MINORMASK) | |
559 | next_minor = 0; | |
560 | if (next_minor == start) { | |
561 | /* Oh dear, all in use. */ | |
562 | spin_unlock(&all_mddevs_lock); | |
563 | kfree(new); | |
564 | return NULL; | |
565 | } | |
f72ffdd6 | 566 | |
efeb53c0 N |
567 | is_free = 1; |
568 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
569 | if (mddev->unit == dev) { | |
570 | is_free = 0; | |
571 | break; | |
572 | } | |
573 | } | |
574 | new->unit = dev; | |
575 | new->md_minor = MINOR(dev); | |
576 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
577 | list_add(&new->all_mddevs, &all_mddevs); |
578 | spin_unlock(&all_mddevs_lock); | |
579 | return new; | |
580 | } | |
581 | spin_unlock(&all_mddevs_lock); | |
582 | ||
9ffae0cf | 583 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
584 | if (!new) |
585 | return NULL; | |
586 | ||
1da177e4 LT |
587 | new->unit = unit; |
588 | if (MAJOR(unit) == MD_MAJOR) | |
589 | new->md_minor = MINOR(unit); | |
590 | else | |
591 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
592 | ||
fafd7fb0 | 593 | mddev_init(new); |
1da177e4 | 594 | |
1da177e4 LT |
595 | goto retry; |
596 | } | |
597 | ||
b6eb127d N |
598 | static struct attribute_group md_redundancy_group; |
599 | ||
5c47daf6 | 600 | void mddev_unlock(struct mddev *mddev) |
1da177e4 | 601 | { |
a64c876f | 602 | if (mddev->to_remove) { |
b6eb127d N |
603 | /* These cannot be removed under reconfig_mutex as |
604 | * an access to the files will try to take reconfig_mutex | |
605 | * while holding the file unremovable, which leads to | |
606 | * a deadlock. | |
bb4f1e9d N |
607 | * So hold set sysfs_active while the remove in happeing, |
608 | * and anything else which might set ->to_remove or my | |
609 | * otherwise change the sysfs namespace will fail with | |
610 | * -EBUSY if sysfs_active is still set. | |
611 | * We set sysfs_active under reconfig_mutex and elsewhere | |
612 | * test it under the same mutex to ensure its correct value | |
613 | * is seen. | |
b6eb127d | 614 | */ |
a64c876f N |
615 | struct attribute_group *to_remove = mddev->to_remove; |
616 | mddev->to_remove = NULL; | |
bb4f1e9d | 617 | mddev->sysfs_active = 1; |
b6eb127d N |
618 | mutex_unlock(&mddev->reconfig_mutex); |
619 | ||
00bcb4ac N |
620 | if (mddev->kobj.sd) { |
621 | if (to_remove != &md_redundancy_group) | |
622 | sysfs_remove_group(&mddev->kobj, to_remove); | |
623 | if (mddev->pers == NULL || | |
624 | mddev->pers->sync_request == NULL) { | |
625 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
626 | if (mddev->sysfs_action) | |
627 | sysfs_put(mddev->sysfs_action); | |
628 | mddev->sysfs_action = NULL; | |
629 | } | |
a64c876f | 630 | } |
bb4f1e9d | 631 | mddev->sysfs_active = 0; |
b6eb127d N |
632 | } else |
633 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 634 | |
751e67ca CD |
635 | /* As we've dropped the mutex we need a spinlock to |
636 | * make sure the thread doesn't disappear | |
01f96c0a N |
637 | */ |
638 | spin_lock(&pers_lock); | |
005eca5e | 639 | md_wakeup_thread(mddev->thread); |
01f96c0a | 640 | spin_unlock(&pers_lock); |
1da177e4 | 641 | } |
5c47daf6 | 642 | EXPORT_SYMBOL_GPL(mddev_unlock); |
1da177e4 | 643 | |
1ca69c4b N |
644 | static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr) |
645 | { | |
646 | struct md_rdev *rdev; | |
647 | ||
648 | rdev_for_each_rcu(rdev, mddev) | |
649 | if (rdev->desc_nr == nr) | |
650 | return rdev; | |
651 | ||
652 | return NULL; | |
653 | } | |
654 | ||
655 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 656 | { |
3cb03002 | 657 | struct md_rdev *rdev; |
1da177e4 | 658 | |
dafb20fa | 659 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
660 | if (rdev->bdev->bd_dev == dev) |
661 | return rdev; | |
159ec1fc | 662 | |
1da177e4 LT |
663 | return NULL; |
664 | } | |
665 | ||
1ca69c4b N |
666 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
667 | { | |
668 | struct md_rdev *rdev; | |
669 | ||
670 | rdev_for_each_rcu(rdev, mddev) | |
671 | if (rdev->bdev->bd_dev == dev) | |
672 | return rdev; | |
673 | ||
674 | return NULL; | |
675 | } | |
676 | ||
84fc4b56 | 677 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 678 | { |
84fc4b56 | 679 | struct md_personality *pers; |
d9d166c2 N |
680 | list_for_each_entry(pers, &pers_list, list) { |
681 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 682 | return pers; |
d9d166c2 N |
683 | if (strcmp(pers->name, clevel)==0) |
684 | return pers; | |
685 | } | |
2604b703 N |
686 | return NULL; |
687 | } | |
688 | ||
b73df2d3 | 689 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 690 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 691 | { |
57b2caa3 | 692 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 693 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
694 | } |
695 | ||
f72ffdd6 | 696 | static int alloc_disk_sb(struct md_rdev *rdev) |
1da177e4 | 697 | { |
1da177e4 LT |
698 | rdev->sb_page = alloc_page(GFP_KERNEL); |
699 | if (!rdev->sb_page) { | |
700 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 701 | return -ENOMEM; |
1da177e4 LT |
702 | } |
703 | ||
704 | return 0; | |
705 | } | |
706 | ||
545c8795 | 707 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
708 | { |
709 | if (rdev->sb_page) { | |
2d1f3b5d | 710 | put_page(rdev->sb_page); |
1da177e4 LT |
711 | rdev->sb_loaded = 0; |
712 | rdev->sb_page = NULL; | |
0f420358 | 713 | rdev->sb_start = 0; |
dd8ac336 | 714 | rdev->sectors = 0; |
1da177e4 | 715 | } |
2699b672 N |
716 | if (rdev->bb_page) { |
717 | put_page(rdev->bb_page); | |
718 | rdev->bb_page = NULL; | |
719 | } | |
4fa2f327 N |
720 | kfree(rdev->badblocks.page); |
721 | rdev->badblocks.page = NULL; | |
1da177e4 | 722 | } |
545c8795 | 723 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 724 | |
6712ecf8 | 725 | static void super_written(struct bio *bio, int error) |
7bfa19f2 | 726 | { |
3cb03002 | 727 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 728 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 729 | |
3a0f5bbb N |
730 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
731 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
732 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
733 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 734 | md_error(mddev, rdev); |
3a0f5bbb | 735 | } |
7bfa19f2 | 736 | |
a9701a30 N |
737 | if (atomic_dec_and_test(&mddev->pending_writes)) |
738 | wake_up(&mddev->sb_wait); | |
f8b58edf | 739 | bio_put(bio); |
7bfa19f2 N |
740 | } |
741 | ||
fd01b88c | 742 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
743 | sector_t sector, int size, struct page *page) |
744 | { | |
745 | /* write first size bytes of page to sector of rdev | |
746 | * Increment mddev->pending_writes before returning | |
747 | * and decrement it on completion, waking up sb_wait | |
748 | * if zero is reached. | |
749 | * If an error occurred, call md_error | |
750 | */ | |
a167f663 | 751 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 752 | |
a6ff7e08 | 753 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
4f024f37 | 754 | bio->bi_iter.bi_sector = sector; |
7bfa19f2 N |
755 | bio_add_page(bio, page, size, 0); |
756 | bio->bi_private = rdev; | |
757 | bio->bi_end_io = super_written; | |
a9701a30 | 758 | |
7bfa19f2 | 759 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 760 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
761 | } |
762 | ||
fd01b88c | 763 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 764 | { |
e9c7469b | 765 | /* wait for all superblock writes that were scheduled to complete */ |
1967cd56 | 766 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
7bfa19f2 N |
767 | } |
768 | ||
3cb03002 | 769 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 770 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 771 | { |
a167f663 | 772 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
773 | int ret; |
774 | ||
a6ff7e08 JB |
775 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
776 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 | 777 | if (metadata_op) |
4f024f37 | 778 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
1fdd6fc9 N |
779 | else if (rdev->mddev->reshape_position != MaxSector && |
780 | (rdev->mddev->reshape_backwards == | |
781 | (sector >= rdev->mddev->reshape_position))) | |
4f024f37 | 782 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
ccebd4c4 | 783 | else |
4f024f37 | 784 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
1da177e4 | 785 | bio_add_page(bio, page, size, 0); |
c170bbb4 | 786 | submit_bio_wait(rw, bio); |
1da177e4 LT |
787 | |
788 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
789 | bio_put(bio); | |
790 | return ret; | |
791 | } | |
a8745db2 | 792 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 793 | |
f72ffdd6 | 794 | static int read_disk_sb(struct md_rdev *rdev, int size) |
1da177e4 LT |
795 | { |
796 | char b[BDEVNAME_SIZE]; | |
403df478 | 797 | |
1da177e4 LT |
798 | if (rdev->sb_loaded) |
799 | return 0; | |
800 | ||
ccebd4c4 | 801 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
802 | goto fail; |
803 | rdev->sb_loaded = 1; | |
804 | return 0; | |
805 | ||
806 | fail: | |
807 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
808 | bdevname(rdev->bdev,b)); | |
809 | return -EINVAL; | |
810 | } | |
811 | ||
812 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
813 | { | |
f72ffdd6 | 814 | return sb1->set_uuid0 == sb2->set_uuid0 && |
05710466 AN |
815 | sb1->set_uuid1 == sb2->set_uuid1 && |
816 | sb1->set_uuid2 == sb2->set_uuid2 && | |
817 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
818 | } |
819 | ||
1da177e4 LT |
820 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
821 | { | |
822 | int ret; | |
823 | mdp_super_t *tmp1, *tmp2; | |
824 | ||
825 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
826 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
827 | ||
828 | if (!tmp1 || !tmp2) { | |
829 | ret = 0; | |
35020f1a | 830 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
831 | goto abort; |
832 | } | |
833 | ||
834 | *tmp1 = *sb1; | |
835 | *tmp2 = *sb2; | |
836 | ||
837 | /* | |
838 | * nr_disks is not constant | |
839 | */ | |
840 | tmp1->nr_disks = 0; | |
841 | tmp2->nr_disks = 0; | |
842 | ||
ce0c8e05 | 843 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 844 | abort: |
990a8baf JJ |
845 | kfree(tmp1); |
846 | kfree(tmp2); | |
1da177e4 LT |
847 | return ret; |
848 | } | |
849 | ||
4d167f09 N |
850 | static u32 md_csum_fold(u32 csum) |
851 | { | |
852 | csum = (csum & 0xffff) + (csum >> 16); | |
853 | return (csum & 0xffff) + (csum >> 16); | |
854 | } | |
855 | ||
f72ffdd6 | 856 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
1da177e4 | 857 | { |
4d167f09 N |
858 | u64 newcsum = 0; |
859 | u32 *sb32 = (u32*)sb; | |
860 | int i; | |
1da177e4 LT |
861 | unsigned int disk_csum, csum; |
862 | ||
863 | disk_csum = sb->sb_csum; | |
864 | sb->sb_csum = 0; | |
4d167f09 N |
865 | |
866 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
867 | newcsum += sb32[i]; | |
868 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
869 | ||
4d167f09 N |
870 | #ifdef CONFIG_ALPHA |
871 | /* This used to use csum_partial, which was wrong for several | |
872 | * reasons including that different results are returned on | |
873 | * different architectures. It isn't critical that we get exactly | |
874 | * the same return value as before (we always csum_fold before | |
875 | * testing, and that removes any differences). However as we | |
876 | * know that csum_partial always returned a 16bit value on | |
877 | * alphas, do a fold to maximise conformity to previous behaviour. | |
878 | */ | |
879 | sb->sb_csum = md_csum_fold(disk_csum); | |
880 | #else | |
1da177e4 | 881 | sb->sb_csum = disk_csum; |
4d167f09 | 882 | #endif |
1da177e4 LT |
883 | return csum; |
884 | } | |
885 | ||
1da177e4 LT |
886 | /* |
887 | * Handle superblock details. | |
888 | * We want to be able to handle multiple superblock formats | |
889 | * so we have a common interface to them all, and an array of | |
890 | * different handlers. | |
891 | * We rely on user-space to write the initial superblock, and support | |
892 | * reading and updating of superblocks. | |
893 | * Interface methods are: | |
3cb03002 | 894 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
895 | * loads and validates a superblock on dev. |
896 | * if refdev != NULL, compare superblocks on both devices | |
897 | * Return: | |
898 | * 0 - dev has a superblock that is compatible with refdev | |
899 | * 1 - dev has a superblock that is compatible and newer than refdev | |
900 | * so dev should be used as the refdev in future | |
901 | * -EINVAL superblock incompatible or invalid | |
902 | * -othererror e.g. -EIO | |
903 | * | |
fd01b88c | 904 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
905 | * Verify that dev is acceptable into mddev. |
906 | * The first time, mddev->raid_disks will be 0, and data from | |
907 | * dev should be merged in. Subsequent calls check that dev | |
908 | * is new enough. Return 0 or -EINVAL | |
909 | * | |
fd01b88c | 910 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
911 | * Update the superblock for rdev with data in mddev |
912 | * This does not write to disc. | |
913 | * | |
914 | */ | |
915 | ||
916 | struct super_type { | |
0cd17fec CW |
917 | char *name; |
918 | struct module *owner; | |
c6563a8c N |
919 | int (*load_super)(struct md_rdev *rdev, |
920 | struct md_rdev *refdev, | |
0cd17fec | 921 | int minor_version); |
c6563a8c N |
922 | int (*validate_super)(struct mddev *mddev, |
923 | struct md_rdev *rdev); | |
924 | void (*sync_super)(struct mddev *mddev, | |
925 | struct md_rdev *rdev); | |
3cb03002 | 926 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 927 | sector_t num_sectors); |
c6563a8c N |
928 | int (*allow_new_offset)(struct md_rdev *rdev, |
929 | unsigned long long new_offset); | |
1da177e4 LT |
930 | }; |
931 | ||
0894cc30 AN |
932 | /* |
933 | * Check that the given mddev has no bitmap. | |
934 | * | |
935 | * This function is called from the run method of all personalities that do not | |
936 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
937 | * has a bitmap. Otherwise, it returns 0. | |
938 | * | |
939 | */ | |
fd01b88c | 940 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 941 | { |
c3d9714e | 942 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
943 | return 0; |
944 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
945 | mdname(mddev), mddev->pers->name); | |
946 | return 1; | |
947 | } | |
948 | EXPORT_SYMBOL(md_check_no_bitmap); | |
949 | ||
1da177e4 | 950 | /* |
f72ffdd6 | 951 | * load_super for 0.90.0 |
1da177e4 | 952 | */ |
3cb03002 | 953 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
954 | { |
955 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
956 | mdp_super_t *sb; | |
957 | int ret; | |
1da177e4 LT |
958 | |
959 | /* | |
0f420358 | 960 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
961 | * it's at the end of the disk. |
962 | * | |
963 | * It also happens to be a multiple of 4Kb. | |
964 | */ | |
57b2caa3 | 965 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 966 | |
0002b271 | 967 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
968 | if (ret) return ret; |
969 | ||
970 | ret = -EINVAL; | |
971 | ||
972 | bdevname(rdev->bdev, b); | |
65a06f06 | 973 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
974 | |
975 | if (sb->md_magic != MD_SB_MAGIC) { | |
976 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
977 | b); | |
978 | goto abort; | |
979 | } | |
980 | ||
981 | if (sb->major_version != 0 || | |
f6705578 N |
982 | sb->minor_version < 90 || |
983 | sb->minor_version > 91) { | |
1da177e4 LT |
984 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
985 | sb->major_version, sb->minor_version, | |
986 | b); | |
987 | goto abort; | |
988 | } | |
989 | ||
990 | if (sb->raid_disks <= 0) | |
991 | goto abort; | |
992 | ||
4d167f09 | 993 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
994 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
995 | b); | |
996 | goto abort; | |
997 | } | |
998 | ||
999 | rdev->preferred_minor = sb->md_minor; | |
1000 | rdev->data_offset = 0; | |
c6563a8c | 1001 | rdev->new_data_offset = 0; |
0002b271 | 1002 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1003 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1004 | |
1005 | if (sb->level == LEVEL_MULTIPATH) | |
1006 | rdev->desc_nr = -1; | |
1007 | else | |
1008 | rdev->desc_nr = sb->this_disk.number; | |
1009 | ||
9a7b2b0f | 1010 | if (!refdev) { |
1da177e4 | 1011 | ret = 1; |
9a7b2b0f | 1012 | } else { |
1da177e4 | 1013 | __u64 ev1, ev2; |
65a06f06 | 1014 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1015 | if (!uuid_equal(refsb, sb)) { |
1016 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1017 | b, bdevname(refdev->bdev,b2)); | |
1018 | goto abort; | |
1019 | } | |
1020 | if (!sb_equal(refsb, sb)) { | |
1021 | printk(KERN_WARNING "md: %s has same UUID" | |
1022 | " but different superblock to %s\n", | |
1023 | b, bdevname(refdev->bdev, b2)); | |
1024 | goto abort; | |
1025 | } | |
1026 | ev1 = md_event(sb); | |
1027 | ev2 = md_event(refsb); | |
1028 | if (ev1 > ev2) | |
1029 | ret = 1; | |
f72ffdd6 | 1030 | else |
1da177e4 LT |
1031 | ret = 0; |
1032 | } | |
8190e754 | 1033 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1034 | /* Limit to 4TB as metadata cannot record more than that. |
1035 | * (not needed for Linear and RAID0 as metadata doesn't | |
1036 | * record this size) | |
1037 | */ | |
1038 | if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) | |
27a7b260 | 1039 | rdev->sectors = (2ULL << 32) - 2; |
1da177e4 | 1040 | |
27a7b260 | 1041 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1042 | /* "this cannot possibly happen" ... */ |
1043 | ret = -EINVAL; | |
1044 | ||
1da177e4 LT |
1045 | abort: |
1046 | return ret; | |
1047 | } | |
1048 | ||
1049 | /* | |
1050 | * validate_super for 0.90.0 | |
1051 | */ | |
fd01b88c | 1052 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1053 | { |
1054 | mdp_disk_t *desc; | |
65a06f06 | 1055 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1056 | __u64 ev1 = md_event(sb); |
1da177e4 | 1057 | |
41158c7e | 1058 | rdev->raid_disk = -1; |
c5d79adb N |
1059 | clear_bit(Faulty, &rdev->flags); |
1060 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1061 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1062 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1063 | |
1da177e4 LT |
1064 | if (mddev->raid_disks == 0) { |
1065 | mddev->major_version = 0; | |
1066 | mddev->minor_version = sb->minor_version; | |
1067 | mddev->patch_version = sb->patch_version; | |
e691063a | 1068 | mddev->external = 0; |
9d8f0363 | 1069 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1070 | mddev->ctime = sb->ctime; |
1071 | mddev->utime = sb->utime; | |
1072 | mddev->level = sb->level; | |
d9d166c2 | 1073 | mddev->clevel[0] = 0; |
1da177e4 LT |
1074 | mddev->layout = sb->layout; |
1075 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1076 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1077 | mddev->events = ev1; |
c3d9714e | 1078 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1079 | mddev->bitmap_info.space = 0; |
1080 | /* bitmap can use 60 K after the 4K superblocks */ | |
c3d9714e | 1081 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 1082 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
2c810cdd | 1083 | mddev->reshape_backwards = 0; |
1da177e4 | 1084 | |
f6705578 N |
1085 | if (mddev->minor_version >= 91) { |
1086 | mddev->reshape_position = sb->reshape_position; | |
1087 | mddev->delta_disks = sb->delta_disks; | |
1088 | mddev->new_level = sb->new_level; | |
1089 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1090 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1091 | if (mddev->delta_disks < 0) |
1092 | mddev->reshape_backwards = 1; | |
f6705578 N |
1093 | } else { |
1094 | mddev->reshape_position = MaxSector; | |
1095 | mddev->delta_disks = 0; | |
1096 | mddev->new_level = mddev->level; | |
1097 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1098 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1099 | } |
1100 | ||
1da177e4 LT |
1101 | if (sb->state & (1<<MD_SB_CLEAN)) |
1102 | mddev->recovery_cp = MaxSector; | |
1103 | else { | |
f72ffdd6 | 1104 | if (sb->events_hi == sb->cp_events_hi && |
1da177e4 LT |
1105 | sb->events_lo == sb->cp_events_lo) { |
1106 | mddev->recovery_cp = sb->recovery_cp; | |
1107 | } else | |
1108 | mddev->recovery_cp = 0; | |
1109 | } | |
1110 | ||
1111 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1112 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1113 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1114 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1115 | ||
1116 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1117 | |
1118 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
6409bb05 | 1119 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1120 | mddev->bitmap_info.offset = |
1121 | mddev->bitmap_info.default_offset; | |
6409bb05 | 1122 | mddev->bitmap_info.space = |
c9ad020f | 1123 | mddev->bitmap_info.default_space; |
6409bb05 | 1124 | } |
a654b9d8 | 1125 | |
41158c7e | 1126 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1127 | /* Insist on good event counter while assembling, except |
1128 | * for spares (which don't need an event count) */ | |
1da177e4 | 1129 | ++ev1; |
be6800a7 N |
1130 | if (sb->disks[rdev->desc_nr].state & ( |
1131 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
f72ffdd6 | 1132 | if (ev1 < mddev->events) |
be6800a7 | 1133 | return -EINVAL; |
41158c7e N |
1134 | } else if (mddev->bitmap) { |
1135 | /* if adding to array with a bitmap, then we can accept an | |
1136 | * older device ... but not too old. | |
1137 | */ | |
41158c7e N |
1138 | if (ev1 < mddev->bitmap->events_cleared) |
1139 | return 0; | |
8313b8e5 N |
1140 | if (ev1 < mddev->events) |
1141 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1142 | } else { |
1143 | if (ev1 < mddev->events) | |
1144 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1145 | return 0; | |
1146 | } | |
41158c7e | 1147 | |
1da177e4 | 1148 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1149 | desc = sb->disks + rdev->desc_nr; |
1150 | ||
1151 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1152 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1153 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1154 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1155 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1156 | rdev->raid_disk = desc->raid_disk; |
f466722c | 1157 | rdev->saved_raid_disk = desc->raid_disk; |
0261cd9f N |
1158 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1159 | /* active but not in sync implies recovery up to | |
1160 | * reshape position. We don't know exactly where | |
1161 | * that is, so set to zero for now */ | |
1162 | if (mddev->minor_version >= 91) { | |
1163 | rdev->recovery_offset = 0; | |
1164 | rdev->raid_disk = desc->raid_disk; | |
1165 | } | |
1da177e4 | 1166 | } |
8ddf9efe N |
1167 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1168 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1169 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1170 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1171 | return 0; |
1172 | } | |
1173 | ||
1174 | /* | |
1175 | * sync_super for 0.90.0 | |
1176 | */ | |
fd01b88c | 1177 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1178 | { |
1179 | mdp_super_t *sb; | |
3cb03002 | 1180 | struct md_rdev *rdev2; |
1da177e4 | 1181 | int next_spare = mddev->raid_disks; |
19133a42 | 1182 | |
1da177e4 LT |
1183 | /* make rdev->sb match mddev data.. |
1184 | * | |
1185 | * 1/ zero out disks | |
1186 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1187 | * 3/ any empty disks < next_spare become removed | |
1188 | * | |
1189 | * disks[0] gets initialised to REMOVED because | |
1190 | * we cannot be sure from other fields if it has | |
1191 | * been initialised or not. | |
1192 | */ | |
1193 | int i; | |
1194 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1195 | ||
61181565 N |
1196 | rdev->sb_size = MD_SB_BYTES; |
1197 | ||
65a06f06 | 1198 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1199 | |
1200 | memset(sb, 0, sizeof(*sb)); | |
1201 | ||
1202 | sb->md_magic = MD_SB_MAGIC; | |
1203 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1204 | sb->patch_version = mddev->patch_version; |
1205 | sb->gvalid_words = 0; /* ignored */ | |
1206 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1207 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1208 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1209 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1210 | ||
1211 | sb->ctime = mddev->ctime; | |
1212 | sb->level = mddev->level; | |
58c0fed4 | 1213 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1214 | sb->raid_disks = mddev->raid_disks; |
1215 | sb->md_minor = mddev->md_minor; | |
e691063a | 1216 | sb->not_persistent = 0; |
1da177e4 LT |
1217 | sb->utime = mddev->utime; |
1218 | sb->state = 0; | |
1219 | sb->events_hi = (mddev->events>>32); | |
1220 | sb->events_lo = (u32)mddev->events; | |
1221 | ||
f6705578 N |
1222 | if (mddev->reshape_position == MaxSector) |
1223 | sb->minor_version = 90; | |
1224 | else { | |
1225 | sb->minor_version = 91; | |
1226 | sb->reshape_position = mddev->reshape_position; | |
1227 | sb->new_level = mddev->new_level; | |
1228 | sb->delta_disks = mddev->delta_disks; | |
1229 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1230 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1231 | } |
1232 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1233 | if (mddev->in_sync) |
1234 | { | |
1235 | sb->recovery_cp = mddev->recovery_cp; | |
1236 | sb->cp_events_hi = (mddev->events>>32); | |
1237 | sb->cp_events_lo = (u32)mddev->events; | |
1238 | if (mddev->recovery_cp == MaxSector) | |
1239 | sb->state = (1<< MD_SB_CLEAN); | |
1240 | } else | |
1241 | sb->recovery_cp = 0; | |
1242 | ||
1243 | sb->layout = mddev->layout; | |
9d8f0363 | 1244 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1245 | |
c3d9714e | 1246 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1247 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1248 | ||
1da177e4 | 1249 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1250 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1251 | mdp_disk_t *d; |
86e6ffdd | 1252 | int desc_nr; |
0261cd9f N |
1253 | int is_active = test_bit(In_sync, &rdev2->flags); |
1254 | ||
1255 | if (rdev2->raid_disk >= 0 && | |
1256 | sb->minor_version >= 91) | |
1257 | /* we have nowhere to store the recovery_offset, | |
1258 | * but if it is not below the reshape_position, | |
1259 | * we can piggy-back on that. | |
1260 | */ | |
1261 | is_active = 1; | |
1262 | if (rdev2->raid_disk < 0 || | |
1263 | test_bit(Faulty, &rdev2->flags)) | |
1264 | is_active = 0; | |
1265 | if (is_active) | |
86e6ffdd | 1266 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1267 | else |
86e6ffdd | 1268 | desc_nr = next_spare++; |
19133a42 | 1269 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1270 | d = &sb->disks[rdev2->desc_nr]; |
1271 | nr_disks++; | |
1272 | d->number = rdev2->desc_nr; | |
1273 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1274 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1275 | if (is_active) |
1da177e4 LT |
1276 | d->raid_disk = rdev2->raid_disk; |
1277 | else | |
1278 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1279 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1280 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1281 | else if (is_active) { |
1da177e4 | 1282 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1283 | if (test_bit(In_sync, &rdev2->flags)) |
1284 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1285 | active++; |
1286 | working++; | |
1287 | } else { | |
1288 | d->state = 0; | |
1289 | spare++; | |
1290 | working++; | |
1291 | } | |
8ddf9efe N |
1292 | if (test_bit(WriteMostly, &rdev2->flags)) |
1293 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1294 | } |
1da177e4 LT |
1295 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1296 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1297 | mdp_disk_t *d = &sb->disks[i]; | |
1298 | if (d->state == 0 && d->number == 0) { | |
1299 | d->number = i; | |
1300 | d->raid_disk = i; | |
1301 | d->state = (1<<MD_DISK_REMOVED); | |
1302 | d->state |= (1<<MD_DISK_FAULTY); | |
1303 | failed++; | |
1304 | } | |
1305 | } | |
1306 | sb->nr_disks = nr_disks; | |
1307 | sb->active_disks = active; | |
1308 | sb->working_disks = working; | |
1309 | sb->failed_disks = failed; | |
1310 | sb->spare_disks = spare; | |
1311 | ||
1312 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1313 | sb->sb_csum = calc_sb_csum(sb); | |
1314 | } | |
1315 | ||
0cd17fec CW |
1316 | /* |
1317 | * rdev_size_change for 0.90.0 | |
1318 | */ | |
1319 | static unsigned long long | |
3cb03002 | 1320 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1321 | { |
58c0fed4 | 1322 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1323 | return 0; /* component must fit device */ |
c3d9714e | 1324 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1325 | return 0; /* can't move bitmap */ |
57b2caa3 | 1326 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1327 | if (!num_sectors || num_sectors > rdev->sb_start) |
1328 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1329 | /* Limit to 4TB as metadata cannot record more than that. |
1330 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1331 | */ | |
667a5313 | 1332 | if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) |
27a7b260 | 1333 | num_sectors = (2ULL << 32) - 2; |
0f420358 | 1334 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1335 | rdev->sb_page); |
1336 | md_super_wait(rdev->mddev); | |
c26a44ed | 1337 | return num_sectors; |
0cd17fec CW |
1338 | } |
1339 | ||
c6563a8c N |
1340 | static int |
1341 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1342 | { | |
1343 | /* non-zero offset changes not possible with v0.90 */ | |
1344 | return new_offset == 0; | |
1345 | } | |
0cd17fec | 1346 | |
1da177e4 LT |
1347 | /* |
1348 | * version 1 superblock | |
1349 | */ | |
1350 | ||
f72ffdd6 | 1351 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
1da177e4 | 1352 | { |
1c05b4bc N |
1353 | __le32 disk_csum; |
1354 | u32 csum; | |
1da177e4 LT |
1355 | unsigned long long newcsum; |
1356 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1357 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1358 | |
1359 | disk_csum = sb->sb_csum; | |
1360 | sb->sb_csum = 0; | |
1361 | newcsum = 0; | |
1f3c9907 | 1362 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1363 | newcsum += le32_to_cpu(*isuper++); |
1364 | ||
1365 | if (size == 2) | |
1c05b4bc | 1366 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1367 | |
1368 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1369 | sb->sb_csum = disk_csum; | |
1370 | return cpu_to_le32(csum); | |
1371 | } | |
1372 | ||
2699b672 N |
1373 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1374 | int acknowledged); | |
3cb03002 | 1375 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1376 | { |
1377 | struct mdp_superblock_1 *sb; | |
1378 | int ret; | |
0f420358 | 1379 | sector_t sb_start; |
c6563a8c | 1380 | sector_t sectors; |
1da177e4 | 1381 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1382 | int bmask; |
1da177e4 LT |
1383 | |
1384 | /* | |
0f420358 | 1385 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1386 | * It is always aligned to a 4K boundary and |
1387 | * depeding on minor_version, it can be: | |
1388 | * 0: At least 8K, but less than 12K, from end of device | |
1389 | * 1: At start of device | |
1390 | * 2: 4K from start of device. | |
1391 | */ | |
1392 | switch(minor_version) { | |
1393 | case 0: | |
77304d2a | 1394 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1395 | sb_start -= 8*2; |
1396 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1397 | break; |
1398 | case 1: | |
0f420358 | 1399 | sb_start = 0; |
1da177e4 LT |
1400 | break; |
1401 | case 2: | |
0f420358 | 1402 | sb_start = 8; |
1da177e4 LT |
1403 | break; |
1404 | default: | |
1405 | return -EINVAL; | |
1406 | } | |
0f420358 | 1407 | rdev->sb_start = sb_start; |
1da177e4 | 1408 | |
0002b271 N |
1409 | /* superblock is rarely larger than 1K, but it can be larger, |
1410 | * and it is safe to read 4k, so we do that | |
1411 | */ | |
1412 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1413 | if (ret) return ret; |
1414 | ||
65a06f06 | 1415 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1416 | |
1417 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1418 | sb->major_version != cpu_to_le32(1) || | |
1419 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1420 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1421 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1422 | return -EINVAL; |
1423 | ||
1424 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1425 | printk("md: invalid superblock checksum on %s\n", | |
1426 | bdevname(rdev->bdev,b)); | |
1427 | return -EINVAL; | |
1428 | } | |
1429 | if (le64_to_cpu(sb->data_size) < 10) { | |
1430 | printk("md: data_size too small on %s\n", | |
1431 | bdevname(rdev->bdev,b)); | |
1432 | return -EINVAL; | |
1433 | } | |
c6563a8c N |
1434 | if (sb->pad0 || |
1435 | sb->pad3[0] || | |
1436 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1437 | /* Some padding is non-zero, might be a new feature */ | |
1438 | return -EINVAL; | |
e11e93fa | 1439 | |
1da177e4 LT |
1440 | rdev->preferred_minor = 0xffff; |
1441 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1442 | rdev->new_data_offset = rdev->data_offset; |
1443 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1444 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1445 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1446 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1447 | |
0002b271 | 1448 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1449 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1450 | if (rdev->sb_size & bmask) |
a1801f85 N |
1451 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1452 | ||
1453 | if (minor_version | |
0f420358 | 1454 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1455 | return -EINVAL; |
c6563a8c N |
1456 | if (minor_version |
1457 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1458 | return -EINVAL; | |
0002b271 | 1459 | |
31b65a0d N |
1460 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1461 | rdev->desc_nr = -1; | |
1462 | else | |
1463 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1464 | ||
2699b672 N |
1465 | if (!rdev->bb_page) { |
1466 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1467 | if (!rdev->bb_page) | |
1468 | return -ENOMEM; | |
1469 | } | |
1470 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1471 | rdev->badblocks.count == 0) { | |
1472 | /* need to load the bad block list. | |
1473 | * Currently we limit it to one page. | |
1474 | */ | |
1475 | s32 offset; | |
1476 | sector_t bb_sector; | |
1477 | u64 *bbp; | |
1478 | int i; | |
1479 | int sectors = le16_to_cpu(sb->bblog_size); | |
1480 | if (sectors > (PAGE_SIZE / 512)) | |
1481 | return -EINVAL; | |
1482 | offset = le32_to_cpu(sb->bblog_offset); | |
1483 | if (offset == 0) | |
1484 | return -EINVAL; | |
1485 | bb_sector = (long long)offset; | |
1486 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1487 | rdev->bb_page, READ, true)) | |
1488 | return -EIO; | |
1489 | bbp = (u64 *)page_address(rdev->bb_page); | |
1490 | rdev->badblocks.shift = sb->bblog_shift; | |
1491 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1492 | u64 bb = le64_to_cpu(*bbp); | |
1493 | int count = bb & (0x3ff); | |
1494 | u64 sector = bb >> 10; | |
1495 | sector <<= sb->bblog_shift; | |
1496 | count <<= sb->bblog_shift; | |
1497 | if (bb + 1 == 0) | |
1498 | break; | |
1499 | if (md_set_badblocks(&rdev->badblocks, | |
1500 | sector, count, 1) == 0) | |
1501 | return -EINVAL; | |
1502 | } | |
486adf72 N |
1503 | } else if (sb->bblog_offset != 0) |
1504 | rdev->badblocks.shift = 0; | |
2699b672 | 1505 | |
9a7b2b0f | 1506 | if (!refdev) { |
8ed75463 | 1507 | ret = 1; |
9a7b2b0f | 1508 | } else { |
1da177e4 | 1509 | __u64 ev1, ev2; |
65a06f06 | 1510 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1511 | |
1512 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1513 | sb->level != refsb->level || | |
1514 | sb->layout != refsb->layout || | |
1515 | sb->chunksize != refsb->chunksize) { | |
1516 | printk(KERN_WARNING "md: %s has strangely different" | |
1517 | " superblock to %s\n", | |
1518 | bdevname(rdev->bdev,b), | |
1519 | bdevname(refdev->bdev,b2)); | |
1520 | return -EINVAL; | |
1521 | } | |
1522 | ev1 = le64_to_cpu(sb->events); | |
1523 | ev2 = le64_to_cpu(refsb->events); | |
1524 | ||
1525 | if (ev1 > ev2) | |
8ed75463 N |
1526 | ret = 1; |
1527 | else | |
1528 | ret = 0; | |
1da177e4 | 1529 | } |
c6563a8c N |
1530 | if (minor_version) { |
1531 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1532 | sectors -= rdev->data_offset; | |
1533 | } else | |
1534 | sectors = rdev->sb_start; | |
1535 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1536 | return -EINVAL; |
dd8ac336 | 1537 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1538 | return ret; |
1da177e4 LT |
1539 | } |
1540 | ||
fd01b88c | 1541 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1542 | { |
65a06f06 | 1543 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1544 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1545 | |
41158c7e | 1546 | rdev->raid_disk = -1; |
c5d79adb N |
1547 | clear_bit(Faulty, &rdev->flags); |
1548 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1549 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1550 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1551 | |
1da177e4 LT |
1552 | if (mddev->raid_disks == 0) { |
1553 | mddev->major_version = 1; | |
1554 | mddev->patch_version = 0; | |
e691063a | 1555 | mddev->external = 0; |
9d8f0363 | 1556 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1557 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1558 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1559 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1560 | mddev->clevel[0] = 0; |
1da177e4 LT |
1561 | mddev->layout = le32_to_cpu(sb->layout); |
1562 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1563 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1564 | mddev->events = ev1; |
c3d9714e | 1565 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1566 | mddev->bitmap_info.space = 0; |
1567 | /* Default location for bitmap is 1K after superblock | |
1568 | * using 3K - total of 4K | |
1569 | */ | |
c3d9714e | 1570 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1571 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1572 | mddev->reshape_backwards = 0; |
1573 | ||
1da177e4 LT |
1574 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1575 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1576 | ||
1577 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1578 | |
71c0805c | 1579 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1580 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1581 | mddev->bitmap_info.offset = |
1582 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1583 | /* Metadata doesn't record how much space is available. |
1584 | * For 1.0, we assume we can use up to the superblock | |
1585 | * if before, else to 4K beyond superblock. | |
1586 | * For others, assume no change is possible. | |
1587 | */ | |
1588 | if (mddev->minor_version > 0) | |
1589 | mddev->bitmap_info.space = 0; | |
1590 | else if (mddev->bitmap_info.offset > 0) | |
1591 | mddev->bitmap_info.space = | |
1592 | 8 - mddev->bitmap_info.offset; | |
1593 | else | |
1594 | mddev->bitmap_info.space = | |
1595 | -mddev->bitmap_info.offset; | |
1596 | } | |
e11e93fa | 1597 | |
f6705578 N |
1598 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1599 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1600 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1601 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1602 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1603 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1604 | if (mddev->delta_disks < 0 || |
1605 | (mddev->delta_disks == 0 && | |
1606 | (le32_to_cpu(sb->feature_map) | |
1607 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1608 | mddev->reshape_backwards = 1; | |
f6705578 N |
1609 | } else { |
1610 | mddev->reshape_position = MaxSector; | |
1611 | mddev->delta_disks = 0; | |
1612 | mddev->new_level = mddev->level; | |
1613 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1614 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1615 | } |
1616 | ||
41158c7e | 1617 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1618 | /* Insist of good event counter while assembling, except for |
1619 | * spares (which don't need an event count) */ | |
1da177e4 | 1620 | ++ev1; |
be6800a7 N |
1621 | if (rdev->desc_nr >= 0 && |
1622 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1623 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1624 | if (ev1 < mddev->events) | |
1625 | return -EINVAL; | |
41158c7e N |
1626 | } else if (mddev->bitmap) { |
1627 | /* If adding to array with a bitmap, then we can accept an | |
1628 | * older device, but not too old. | |
1629 | */ | |
41158c7e N |
1630 | if (ev1 < mddev->bitmap->events_cleared) |
1631 | return 0; | |
8313b8e5 N |
1632 | if (ev1 < mddev->events) |
1633 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1634 | } else { |
1635 | if (ev1 < mddev->events) | |
1636 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1637 | return 0; | |
1638 | } | |
1da177e4 LT |
1639 | if (mddev->level != LEVEL_MULTIPATH) { |
1640 | int role; | |
3673f305 N |
1641 | if (rdev->desc_nr < 0 || |
1642 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1643 | role = 0xffff; | |
1644 | rdev->desc_nr = -1; | |
1645 | } else | |
1646 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1647 | switch(role) { |
1648 | case 0xffff: /* spare */ | |
1da177e4 LT |
1649 | break; |
1650 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1651 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1652 | break; |
1653 | default: | |
f466722c | 1654 | rdev->saved_raid_disk = role; |
5fd6c1dc | 1655 | if ((le32_to_cpu(sb->feature_map) & |
f466722c | 1656 | MD_FEATURE_RECOVERY_OFFSET)) { |
5fd6c1dc | 1657 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
f466722c N |
1658 | if (!(le32_to_cpu(sb->feature_map) & |
1659 | MD_FEATURE_RECOVERY_BITMAP)) | |
1660 | rdev->saved_raid_disk = -1; | |
1661 | } else | |
5fd6c1dc | 1662 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1663 | rdev->raid_disk = role; |
1664 | break; | |
1665 | } | |
8ddf9efe N |
1666 | if (sb->devflags & WriteMostly1) |
1667 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1668 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1669 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1670 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1671 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1672 | |
1da177e4 LT |
1673 | return 0; |
1674 | } | |
1675 | ||
fd01b88c | 1676 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1677 | { |
1678 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1679 | struct md_rdev *rdev2; |
1da177e4 LT |
1680 | int max_dev, i; |
1681 | /* make rdev->sb match mddev and rdev data. */ | |
1682 | ||
65a06f06 | 1683 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1684 | |
1685 | sb->feature_map = 0; | |
1686 | sb->pad0 = 0; | |
5fd6c1dc | 1687 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1688 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1689 | ||
1690 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1691 | sb->events = cpu_to_le64(mddev->events); | |
1692 | if (mddev->in_sync) | |
1693 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1694 | else | |
1695 | sb->resync_offset = cpu_to_le64(0); | |
1696 | ||
1c05b4bc | 1697 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1698 | |
f0ca340c | 1699 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1700 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1701 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1702 | sb->level = cpu_to_le32(mddev->level); |
1703 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1704 | |
aeb9b211 N |
1705 | if (test_bit(WriteMostly, &rdev->flags)) |
1706 | sb->devflags |= WriteMostly1; | |
1707 | else | |
1708 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1709 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1710 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1711 | |
c3d9714e N |
1712 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1713 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1714 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1715 | } |
5fd6c1dc N |
1716 | |
1717 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1718 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1719 | sb->feature_map |= |
1720 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1721 | sb->recovery_offset = | |
1722 | cpu_to_le64(rdev->recovery_offset); | |
f466722c N |
1723 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
1724 | sb->feature_map |= | |
1725 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); | |
5fd6c1dc | 1726 | } |
2d78f8c4 N |
1727 | if (test_bit(Replacement, &rdev->flags)) |
1728 | sb->feature_map |= | |
1729 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1730 | |
f6705578 N |
1731 | if (mddev->reshape_position != MaxSector) { |
1732 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1733 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1734 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1735 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1736 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1737 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1738 | if (mddev->delta_disks == 0 && |
1739 | mddev->reshape_backwards) | |
1740 | sb->feature_map | |
1741 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1742 | if (rdev->new_data_offset != rdev->data_offset) { |
1743 | sb->feature_map | |
1744 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1745 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1746 | - rdev->data_offset)); | |
1747 | } | |
f6705578 | 1748 | } |
a654b9d8 | 1749 | |
2699b672 N |
1750 | if (rdev->badblocks.count == 0) |
1751 | /* Nothing to do for bad blocks*/ ; | |
1752 | else if (sb->bblog_offset == 0) | |
1753 | /* Cannot record bad blocks on this device */ | |
1754 | md_error(mddev, rdev); | |
1755 | else { | |
1756 | struct badblocks *bb = &rdev->badblocks; | |
1757 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1758 | u64 *p = bb->page; | |
1759 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1760 | if (bb->changed) { | |
1761 | unsigned seq; | |
1762 | ||
1763 | retry: | |
1764 | seq = read_seqbegin(&bb->lock); | |
1765 | ||
1766 | memset(bbp, 0xff, PAGE_SIZE); | |
1767 | ||
1768 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1769 | u64 internal_bb = p[i]; |
2699b672 N |
1770 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1771 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1772 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1773 | } |
d0962936 | 1774 | bb->changed = 0; |
2699b672 N |
1775 | if (read_seqretry(&bb->lock, seq)) |
1776 | goto retry; | |
1777 | ||
1778 | bb->sector = (rdev->sb_start + | |
1779 | (int)le32_to_cpu(sb->bblog_offset)); | |
1780 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1781 | } |
1782 | } | |
1783 | ||
1da177e4 | 1784 | max_dev = 0; |
dafb20fa | 1785 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1786 | if (rdev2->desc_nr+1 > max_dev) |
1787 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1788 | |
70471daf N |
1789 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1790 | int bmask; | |
a778b73f | 1791 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1792 | rdev->sb_size = max_dev * 2 + 256; |
1793 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1794 | if (rdev->sb_size & bmask) | |
1795 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1796 | } else |
1797 | max_dev = le32_to_cpu(sb->max_dev); | |
1798 | ||
1da177e4 LT |
1799 | for (i=0; i<max_dev;i++) |
1800 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
f72ffdd6 | 1801 | |
dafb20fa | 1802 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1803 | i = rdev2->desc_nr; |
b2d444d7 | 1804 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1805 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1806 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1807 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1808 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1809 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1810 | else |
1811 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1812 | } | |
1813 | ||
1da177e4 LT |
1814 | sb->sb_csum = calc_sb_1_csum(sb); |
1815 | } | |
1816 | ||
0cd17fec | 1817 | static unsigned long long |
3cb03002 | 1818 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1819 | { |
1820 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1821 | sector_t max_sectors; |
58c0fed4 | 1822 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1823 | return 0; /* component must fit device */ |
c6563a8c N |
1824 | if (rdev->data_offset != rdev->new_data_offset) |
1825 | return 0; /* too confusing */ | |
0f420358 | 1826 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1827 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1828 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1829 | max_sectors -= rdev->data_offset; |
1830 | if (!num_sectors || num_sectors > max_sectors) | |
1831 | num_sectors = max_sectors; | |
c3d9714e | 1832 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1833 | /* minor version 0 with bitmap we can't move */ |
1834 | return 0; | |
1835 | } else { | |
1836 | /* minor version 0; superblock after data */ | |
0f420358 | 1837 | sector_t sb_start; |
77304d2a | 1838 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1839 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1840 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1841 | if (!num_sectors || num_sectors > max_sectors) |
1842 | num_sectors = max_sectors; | |
0f420358 | 1843 | rdev->sb_start = sb_start; |
0cd17fec | 1844 | } |
65a06f06 | 1845 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1846 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1847 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1848 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1849 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1850 | rdev->sb_page); |
1851 | md_super_wait(rdev->mddev); | |
c26a44ed | 1852 | return num_sectors; |
c6563a8c N |
1853 | |
1854 | } | |
1855 | ||
1856 | static int | |
1857 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1858 | unsigned long long new_offset) | |
1859 | { | |
1860 | /* All necessary checks on new >= old have been done */ | |
1861 | struct bitmap *bitmap; | |
1862 | if (new_offset >= rdev->data_offset) | |
1863 | return 1; | |
1864 | ||
1865 | /* with 1.0 metadata, there is no metadata to tread on | |
1866 | * so we can always move back */ | |
1867 | if (rdev->mddev->minor_version == 0) | |
1868 | return 1; | |
1869 | ||
1870 | /* otherwise we must be sure not to step on | |
1871 | * any metadata, so stay: | |
1872 | * 36K beyond start of superblock | |
1873 | * beyond end of badblocks | |
1874 | * beyond write-intent bitmap | |
1875 | */ | |
1876 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1877 | return 0; | |
1878 | bitmap = rdev->mddev->bitmap; | |
1879 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1880 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 1881 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
1882 | return 0; |
1883 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1884 | return 0; | |
1885 | ||
1886 | return 1; | |
0cd17fec | 1887 | } |
1da177e4 | 1888 | |
75c96f85 | 1889 | static struct super_type super_types[] = { |
1da177e4 LT |
1890 | [0] = { |
1891 | .name = "0.90.0", | |
1892 | .owner = THIS_MODULE, | |
0cd17fec CW |
1893 | .load_super = super_90_load, |
1894 | .validate_super = super_90_validate, | |
1895 | .sync_super = super_90_sync, | |
1896 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1897 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1898 | }, |
1899 | [1] = { | |
1900 | .name = "md-1", | |
1901 | .owner = THIS_MODULE, | |
0cd17fec CW |
1902 | .load_super = super_1_load, |
1903 | .validate_super = super_1_validate, | |
1904 | .sync_super = super_1_sync, | |
1905 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1906 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1907 | }, |
1908 | }; | |
1da177e4 | 1909 | |
fd01b88c | 1910 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1911 | { |
1912 | if (mddev->sync_super) { | |
1913 | mddev->sync_super(mddev, rdev); | |
1914 | return; | |
1915 | } | |
1916 | ||
1917 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1918 | ||
1919 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1920 | } | |
1921 | ||
fd01b88c | 1922 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1923 | { |
3cb03002 | 1924 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1925 | |
4b80991c N |
1926 | rcu_read_lock(); |
1927 | rdev_for_each_rcu(rdev, mddev1) | |
1928 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1929 | if (rdev->bdev->bd_contains == |
4b80991c N |
1930 | rdev2->bdev->bd_contains) { |
1931 | rcu_read_unlock(); | |
7dd5e7c3 | 1932 | return 1; |
4b80991c N |
1933 | } |
1934 | rcu_read_unlock(); | |
1da177e4 LT |
1935 | return 0; |
1936 | } | |
1937 | ||
1938 | static LIST_HEAD(pending_raid_disks); | |
1939 | ||
ac5e7113 AN |
1940 | /* |
1941 | * Try to register data integrity profile for an mddev | |
1942 | * | |
1943 | * This is called when an array is started and after a disk has been kicked | |
1944 | * from the array. It only succeeds if all working and active component devices | |
1945 | * are integrity capable with matching profiles. | |
1946 | */ | |
fd01b88c | 1947 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1948 | { |
3cb03002 | 1949 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1950 | |
1951 | if (list_empty(&mddev->disks)) | |
1952 | return 0; /* nothing to do */ | |
629acb6a JB |
1953 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1954 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 1955 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
1956 | /* skip spares and non-functional disks */ |
1957 | if (test_bit(Faulty, &rdev->flags)) | |
1958 | continue; | |
1959 | if (rdev->raid_disk < 0) | |
1960 | continue; | |
ac5e7113 AN |
1961 | if (!reference) { |
1962 | /* Use the first rdev as the reference */ | |
1963 | reference = rdev; | |
1964 | continue; | |
1965 | } | |
1966 | /* does this rdev's profile match the reference profile? */ | |
1967 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1968 | rdev->bdev->bd_disk) < 0) | |
1969 | return -EINVAL; | |
1970 | } | |
89078d57 MP |
1971 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1972 | return 0; | |
ac5e7113 AN |
1973 | /* |
1974 | * All component devices are integrity capable and have matching | |
1975 | * profiles, register the common profile for the md device. | |
1976 | */ | |
1977 | if (blk_integrity_register(mddev->gendisk, | |
1978 | bdev_get_integrity(reference->bdev)) != 0) { | |
1979 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1980 | mdname(mddev)); | |
1981 | return -EINVAL; | |
1982 | } | |
a91a2785 MP |
1983 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
1984 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
1985 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
1986 | mdname(mddev)); | |
1987 | return -EINVAL; | |
1988 | } | |
ac5e7113 AN |
1989 | return 0; |
1990 | } | |
1991 | EXPORT_SYMBOL(md_integrity_register); | |
1992 | ||
1993 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 1994 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 1995 | { |
2863b9eb JB |
1996 | struct blk_integrity *bi_rdev; |
1997 | struct blk_integrity *bi_mddev; | |
1998 | ||
1999 | if (!mddev->gendisk) | |
2000 | return; | |
2001 | ||
2002 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
2003 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 2004 | |
ac5e7113 | 2005 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 2006 | return; |
ac5e7113 | 2007 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 2008 | return; |
ac5e7113 AN |
2009 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2010 | rdev->bdev->bd_disk) >= 0) | |
2011 | return; | |
2012 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2013 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2014 | } |
ac5e7113 | 2015 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2016 | |
f72ffdd6 | 2017 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 2018 | { |
7dd5e7c3 | 2019 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2020 | struct kobject *ko; |
1edf80d3 | 2021 | char *s; |
5e55e2f5 | 2022 | int err; |
1da177e4 | 2023 | |
11e2ede0 DW |
2024 | /* prevent duplicates */ |
2025 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2026 | return -EEXIST; | |
2027 | ||
dd8ac336 AN |
2028 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2029 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2030 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2031 | if (mddev->pers) { |
2032 | /* Cannot change size, so fail | |
2033 | * If mddev->level <= 0, then we don't care | |
2034 | * about aligning sizes (e.g. linear) | |
2035 | */ | |
2036 | if (mddev->level > 0) | |
2037 | return -ENOSPC; | |
2038 | } else | |
dd8ac336 | 2039 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2040 | } |
1da177e4 LT |
2041 | |
2042 | /* Verify rdev->desc_nr is unique. | |
2043 | * If it is -1, assign a free number, else | |
2044 | * check number is not in use | |
2045 | */ | |
4878e9eb | 2046 | rcu_read_lock(); |
1da177e4 LT |
2047 | if (rdev->desc_nr < 0) { |
2048 | int choice = 0; | |
4878e9eb N |
2049 | if (mddev->pers) |
2050 | choice = mddev->raid_disks; | |
2051 | while (find_rdev_nr_rcu(mddev, choice)) | |
1da177e4 LT |
2052 | choice++; |
2053 | rdev->desc_nr = choice; | |
2054 | } else { | |
4878e9eb N |
2055 | if (find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
2056 | rcu_read_unlock(); | |
1da177e4 | 2057 | return -EBUSY; |
4878e9eb | 2058 | } |
1da177e4 | 2059 | } |
4878e9eb | 2060 | rcu_read_unlock(); |
de01dfad N |
2061 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2062 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2063 | mdname(mddev), mddev->max_disks); | |
2064 | return -EBUSY; | |
2065 | } | |
19133a42 | 2066 | bdevname(rdev->bdev,b); |
649316b2 | 2067 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2068 | *s = '!'; |
649316b2 | 2069 | |
1da177e4 | 2070 | rdev->mddev = mddev; |
19133a42 | 2071 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2072 | |
b2d6db58 | 2073 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2074 | goto fail; |
86e6ffdd | 2075 | |
0762b8bd | 2076 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2077 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2078 | /* failure here is OK */; | |
2079 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2080 | |
4b80991c | 2081 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2082 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2083 | |
2084 | /* May as well allow recovery to be retried once */ | |
5389042f | 2085 | mddev->recovery_disabled++; |
3f9d99c1 | 2086 | |
1da177e4 | 2087 | return 0; |
5e55e2f5 N |
2088 | |
2089 | fail: | |
2090 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2091 | b, mdname(mddev)); | |
2092 | return err; | |
1da177e4 LT |
2093 | } |
2094 | ||
177a99b2 | 2095 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2096 | { |
3cb03002 | 2097 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2098 | kobject_del(&rdev->kobj); |
177a99b2 | 2099 | kobject_put(&rdev->kobj); |
5792a285 N |
2100 | } |
2101 | ||
f72ffdd6 | 2102 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2103 | { |
2104 | char b[BDEVNAME_SIZE]; | |
403df478 | 2105 | |
49731baa | 2106 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2107 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2108 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2109 | rdev->mddev = NULL; | |
86e6ffdd | 2110 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2111 | sysfs_put(rdev->sysfs_state); |
2112 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2113 | rdev->badblocks.count = 0; |
5792a285 | 2114 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2115 | * writing to 'remove' to "dev/state". We also need |
2116 | * to delay it due to rcu usage. | |
5792a285 | 2117 | */ |
4b80991c | 2118 | synchronize_rcu(); |
177a99b2 N |
2119 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2120 | kobject_get(&rdev->kobj); | |
e804ac78 | 2121 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2122 | } |
2123 | ||
2124 | /* | |
2125 | * prevent the device from being mounted, repartitioned or | |
2126 | * otherwise reused by a RAID array (or any other kernel | |
2127 | * subsystem), by bd_claiming the device. | |
2128 | */ | |
3cb03002 | 2129 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2130 | { |
2131 | int err = 0; | |
2132 | struct block_device *bdev; | |
2133 | char b[BDEVNAME_SIZE]; | |
2134 | ||
d4d77629 | 2135 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2136 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2137 | if (IS_ERR(bdev)) { |
2138 | printk(KERN_ERR "md: could not open %s.\n", | |
2139 | __bdevname(dev, b)); | |
2140 | return PTR_ERR(bdev); | |
2141 | } | |
1da177e4 LT |
2142 | rdev->bdev = bdev; |
2143 | return err; | |
2144 | } | |
2145 | ||
3cb03002 | 2146 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2147 | { |
2148 | struct block_device *bdev = rdev->bdev; | |
2149 | rdev->bdev = NULL; | |
e525fd89 | 2150 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2151 | } |
2152 | ||
2153 | void md_autodetect_dev(dev_t dev); | |
2154 | ||
f72ffdd6 | 2155 | static void export_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2156 | { |
2157 | char b[BDEVNAME_SIZE]; | |
403df478 | 2158 | |
1da177e4 LT |
2159 | printk(KERN_INFO "md: export_rdev(%s)\n", |
2160 | bdevname(rdev->bdev,b)); | |
545c8795 | 2161 | md_rdev_clear(rdev); |
1da177e4 | 2162 | #ifndef MODULE |
d0fae18f N |
2163 | if (test_bit(AutoDetected, &rdev->flags)) |
2164 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2165 | #endif |
2166 | unlock_rdev(rdev); | |
86e6ffdd | 2167 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2168 | } |
2169 | ||
f72ffdd6 | 2170 | static void kick_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2171 | { |
2172 | unbind_rdev_from_array(rdev); | |
2173 | export_rdev(rdev); | |
2174 | } | |
2175 | ||
fd01b88c | 2176 | static void export_array(struct mddev *mddev) |
1da177e4 | 2177 | { |
0638bb0e | 2178 | struct md_rdev *rdev; |
1da177e4 | 2179 | |
0638bb0e N |
2180 | while (!list_empty(&mddev->disks)) { |
2181 | rdev = list_first_entry(&mddev->disks, struct md_rdev, | |
2182 | same_set); | |
1da177e4 LT |
2183 | kick_rdev_from_array(rdev); |
2184 | } | |
1da177e4 LT |
2185 | mddev->raid_disks = 0; |
2186 | mddev->major_version = 0; | |
2187 | } | |
2188 | ||
f72ffdd6 | 2189 | static void sync_sbs(struct mddev *mddev, int nospares) |
1da177e4 | 2190 | { |
42543769 N |
2191 | /* Update each superblock (in-memory image), but |
2192 | * if we are allowed to, skip spares which already | |
2193 | * have the right event counter, or have one earlier | |
2194 | * (which would mean they aren't being marked as dirty | |
2195 | * with the rest of the array) | |
2196 | */ | |
3cb03002 | 2197 | struct md_rdev *rdev; |
dafb20fa | 2198 | rdev_for_each(rdev, mddev) { |
42543769 N |
2199 | if (rdev->sb_events == mddev->events || |
2200 | (nospares && | |
2201 | rdev->raid_disk < 0 && | |
42543769 N |
2202 | rdev->sb_events+1 == mddev->events)) { |
2203 | /* Don't update this superblock */ | |
2204 | rdev->sb_loaded = 2; | |
2205 | } else { | |
076f968b | 2206 | sync_super(mddev, rdev); |
42543769 N |
2207 | rdev->sb_loaded = 1; |
2208 | } | |
1da177e4 LT |
2209 | } |
2210 | } | |
2211 | ||
f72ffdd6 | 2212 | static void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2213 | { |
3cb03002 | 2214 | struct md_rdev *rdev; |
06d91a5f | 2215 | int sync_req; |
42543769 | 2216 | int nospares = 0; |
2699b672 | 2217 | int any_badblocks_changed = 0; |
1da177e4 | 2218 | |
d87f064f N |
2219 | if (mddev->ro) { |
2220 | if (force_change) | |
2221 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2222 | return; | |
2223 | } | |
1da177e4 | 2224 | repeat: |
3a3a5ddb | 2225 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2226 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2227 | if (rdev->raid_disk >= 0 && |
2228 | mddev->delta_disks >= 0 && | |
2229 | !test_bit(In_sync, &rdev->flags) && | |
2230 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2231 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2232 | ||
f72ffdd6 | 2233 | } |
bd52b746 | 2234 | if (!mddev->persistent) { |
070dc6dd | 2235 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2236 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2237 | if (!mddev->external) { |
d97a41dc | 2238 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2239 | rdev_for_each(rdev, mddev) { |
de393cde | 2240 | if (rdev->badblocks.changed) { |
d0962936 | 2241 | rdev->badblocks.changed = 0; |
de393cde N |
2242 | md_ack_all_badblocks(&rdev->badblocks); |
2243 | md_error(mddev, rdev); | |
2244 | } | |
2245 | clear_bit(Blocked, &rdev->flags); | |
2246 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2247 | wake_up(&rdev->blocked_wait); | |
2248 | } | |
2249 | } | |
3a3a5ddb N |
2250 | wake_up(&mddev->sb_wait); |
2251 | return; | |
2252 | } | |
2253 | ||
85572d7c | 2254 | spin_lock(&mddev->lock); |
84692195 | 2255 | |
3a3a5ddb N |
2256 | mddev->utime = get_seconds(); |
2257 | ||
850b2b42 N |
2258 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2259 | force_change = 1; | |
2260 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2261 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2262 | * though if events isn't the right even/odd, we will have to do | |
2263 | * spares after all | |
2264 | */ | |
2265 | nospares = 1; | |
2266 | if (force_change) | |
2267 | nospares = 0; | |
2268 | if (mddev->degraded) | |
84692195 N |
2269 | /* If the array is degraded, then skipping spares is both |
2270 | * dangerous and fairly pointless. | |
2271 | * Dangerous because a device that was removed from the array | |
2272 | * might have a event_count that still looks up-to-date, | |
2273 | * so it can be re-added without a resync. | |
2274 | * Pointless because if there are any spares to skip, | |
2275 | * then a recovery will happen and soon that array won't | |
2276 | * be degraded any more and the spare can go back to sleep then. | |
2277 | */ | |
850b2b42 | 2278 | nospares = 0; |
84692195 | 2279 | |
06d91a5f | 2280 | sync_req = mddev->in_sync; |
42543769 N |
2281 | |
2282 | /* If this is just a dirty<->clean transition, and the array is clean | |
2283 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2284 | if (nospares |
42543769 | 2285 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2286 | && mddev->can_decrease_events |
2287 | && mddev->events != 1) { | |
42543769 | 2288 | mddev->events--; |
a8707c08 N |
2289 | mddev->can_decrease_events = 0; |
2290 | } else { | |
42543769 N |
2291 | /* otherwise we have to go forward and ... */ |
2292 | mddev->events ++; | |
a8707c08 | 2293 | mddev->can_decrease_events = nospares; |
42543769 | 2294 | } |
1da177e4 | 2295 | |
403df478 N |
2296 | /* |
2297 | * This 64-bit counter should never wrap. | |
2298 | * Either we are in around ~1 trillion A.C., assuming | |
2299 | * 1 reboot per second, or we have a bug... | |
2300 | */ | |
2301 | WARN_ON(mddev->events == 0); | |
2699b672 | 2302 | |
dafb20fa | 2303 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2304 | if (rdev->badblocks.changed) |
2305 | any_badblocks_changed++; | |
de393cde N |
2306 | if (test_bit(Faulty, &rdev->flags)) |
2307 | set_bit(FaultRecorded, &rdev->flags); | |
2308 | } | |
2699b672 | 2309 | |
e691063a | 2310 | sync_sbs(mddev, nospares); |
85572d7c | 2311 | spin_unlock(&mddev->lock); |
1da177e4 | 2312 | |
36a4e1fe N |
2313 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2314 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2315 | |
4ad13663 | 2316 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2317 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2318 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2319 | |
42543769 N |
2320 | if (rdev->sb_loaded != 1) |
2321 | continue; /* no noise on spare devices */ | |
1da177e4 | 2322 | |
f466722c | 2323 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2324 | md_super_write(mddev,rdev, |
0f420358 | 2325 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2326 | rdev->sb_page); |
36a4e1fe N |
2327 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2328 | bdevname(rdev->bdev, b), | |
2329 | (unsigned long long)rdev->sb_start); | |
42543769 | 2330 | rdev->sb_events = mddev->events; |
2699b672 N |
2331 | if (rdev->badblocks.size) { |
2332 | md_super_write(mddev, rdev, | |
2333 | rdev->badblocks.sector, | |
2334 | rdev->badblocks.size << 9, | |
2335 | rdev->bb_page); | |
2336 | rdev->badblocks.size = 0; | |
2337 | } | |
7bfa19f2 | 2338 | |
f466722c | 2339 | } else |
36a4e1fe N |
2340 | pr_debug("md: %s (skipping faulty)\n", |
2341 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2342 | |
7bfa19f2 | 2343 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2344 | /* only need to write one superblock... */ |
2345 | break; | |
2346 | } | |
a9701a30 | 2347 | md_super_wait(mddev); |
850b2b42 | 2348 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2349 | |
85572d7c | 2350 | spin_lock(&mddev->lock); |
850b2b42 N |
2351 | if (mddev->in_sync != sync_req || |
2352 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2353 | /* have to write it out again */ |
85572d7c | 2354 | spin_unlock(&mddev->lock); |
06d91a5f N |
2355 | goto repeat; |
2356 | } | |
850b2b42 | 2357 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
85572d7c | 2358 | spin_unlock(&mddev->lock); |
3d310eb7 | 2359 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2360 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2361 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2362 | |
dafb20fa | 2363 | rdev_for_each(rdev, mddev) { |
de393cde N |
2364 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2365 | clear_bit(Blocked, &rdev->flags); | |
2366 | ||
2367 | if (any_badblocks_changed) | |
2699b672 | 2368 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2369 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2370 | wake_up(&rdev->blocked_wait); | |
2371 | } | |
1da177e4 LT |
2372 | } |
2373 | ||
7f6ce769 | 2374 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2375 | * We want to accept with case. For this we use cmd_match. |
2376 | */ | |
2377 | static int cmd_match(const char *cmd, const char *str) | |
2378 | { | |
2379 | /* See if cmd, written into a sysfs file, matches | |
2380 | * str. They must either be the same, or cmd can | |
2381 | * have a trailing newline | |
2382 | */ | |
2383 | while (*cmd && *str && *cmd == *str) { | |
2384 | cmd++; | |
2385 | str++; | |
2386 | } | |
2387 | if (*cmd == '\n') | |
2388 | cmd++; | |
2389 | if (*str || *cmd) | |
2390 | return 0; | |
2391 | return 1; | |
2392 | } | |
2393 | ||
86e6ffdd N |
2394 | struct rdev_sysfs_entry { |
2395 | struct attribute attr; | |
3cb03002 N |
2396 | ssize_t (*show)(struct md_rdev *, char *); |
2397 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2398 | }; |
2399 | ||
2400 | static ssize_t | |
3cb03002 | 2401 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2402 | { |
2403 | char *sep = ""; | |
20a49ff6 | 2404 | size_t len = 0; |
758bfc8a | 2405 | unsigned long flags = ACCESS_ONCE(rdev->flags); |
86e6ffdd | 2406 | |
758bfc8a | 2407 | if (test_bit(Faulty, &flags) || |
de393cde | 2408 | rdev->badblocks.unacked_exist) { |
86e6ffdd N |
2409 | len+= sprintf(page+len, "%sfaulty",sep); |
2410 | sep = ","; | |
2411 | } | |
758bfc8a | 2412 | if (test_bit(In_sync, &flags)) { |
86e6ffdd N |
2413 | len += sprintf(page+len, "%sin_sync",sep); |
2414 | sep = ","; | |
2415 | } | |
758bfc8a | 2416 | if (test_bit(WriteMostly, &flags)) { |
f655675b N |
2417 | len += sprintf(page+len, "%swrite_mostly",sep); |
2418 | sep = ","; | |
2419 | } | |
758bfc8a | 2420 | if (test_bit(Blocked, &flags) || |
52c64152 | 2421 | (rdev->badblocks.unacked_exist |
758bfc8a | 2422 | && !test_bit(Faulty, &flags))) { |
6bfe0b49 DW |
2423 | len += sprintf(page+len, "%sblocked", sep); |
2424 | sep = ","; | |
2425 | } | |
758bfc8a N |
2426 | if (!test_bit(Faulty, &flags) && |
2427 | !test_bit(In_sync, &flags)) { | |
86e6ffdd N |
2428 | len += sprintf(page+len, "%sspare", sep); |
2429 | sep = ","; | |
2430 | } | |
758bfc8a | 2431 | if (test_bit(WriteErrorSeen, &flags)) { |
d7a9d443 N |
2432 | len += sprintf(page+len, "%swrite_error", sep); |
2433 | sep = ","; | |
2434 | } | |
758bfc8a | 2435 | if (test_bit(WantReplacement, &flags)) { |
2d78f8c4 N |
2436 | len += sprintf(page+len, "%swant_replacement", sep); |
2437 | sep = ","; | |
2438 | } | |
758bfc8a | 2439 | if (test_bit(Replacement, &flags)) { |
2d78f8c4 N |
2440 | len += sprintf(page+len, "%sreplacement", sep); |
2441 | sep = ","; | |
2442 | } | |
2443 | ||
86e6ffdd N |
2444 | return len+sprintf(page+len, "\n"); |
2445 | } | |
2446 | ||
45dc2de1 | 2447 | static ssize_t |
3cb03002 | 2448 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2449 | { |
2450 | /* can write | |
de393cde | 2451 | * faulty - simulates an error |
45dc2de1 | 2452 | * remove - disconnects the device |
f655675b N |
2453 | * writemostly - sets write_mostly |
2454 | * -writemostly - clears write_mostly | |
de393cde N |
2455 | * blocked - sets the Blocked flags |
2456 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2457 | * insync - sets Insync providing device isn't active |
f466722c N |
2458 | * -insync - clear Insync for a device with a slot assigned, |
2459 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2460 | * write_error - sets WriteErrorSeen |
2461 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2462 | */ |
2463 | int err = -EINVAL; | |
2464 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2465 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2466 | if (test_bit(Faulty, &rdev->flags)) |
2467 | err = 0; | |
2468 | else | |
2469 | err = -EBUSY; | |
45dc2de1 N |
2470 | } else if (cmd_match(buf, "remove")) { |
2471 | if (rdev->raid_disk >= 0) | |
2472 | err = -EBUSY; | |
2473 | else { | |
fd01b88c | 2474 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2475 | kick_rdev_from_array(rdev); |
3f9d7b0d N |
2476 | if (mddev->pers) |
2477 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2478 | md_new_event(mddev); |
2479 | err = 0; | |
2480 | } | |
f655675b N |
2481 | } else if (cmd_match(buf, "writemostly")) { |
2482 | set_bit(WriteMostly, &rdev->flags); | |
2483 | err = 0; | |
2484 | } else if (cmd_match(buf, "-writemostly")) { | |
2485 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2486 | err = 0; |
2487 | } else if (cmd_match(buf, "blocked")) { | |
2488 | set_bit(Blocked, &rdev->flags); | |
2489 | err = 0; | |
2490 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2491 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2492 | rdev->badblocks.unacked_exist) { |
de393cde N |
2493 | /* metadata handler doesn't understand badblocks, |
2494 | * so we need to fail the device | |
2495 | */ | |
2496 | md_error(rdev->mddev, rdev); | |
2497 | } | |
6bfe0b49 | 2498 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2499 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2500 | wake_up(&rdev->blocked_wait); |
2501 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2502 | md_wakeup_thread(rdev->mddev->thread); | |
2503 | ||
6d56e278 N |
2504 | err = 0; |
2505 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2506 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2507 | err = 0; |
f466722c | 2508 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) { |
e1960f8c N |
2509 | if (rdev->mddev->pers == NULL) { |
2510 | clear_bit(In_sync, &rdev->flags); | |
2511 | rdev->saved_raid_disk = rdev->raid_disk; | |
2512 | rdev->raid_disk = -1; | |
2513 | err = 0; | |
2514 | } | |
d7a9d443 N |
2515 | } else if (cmd_match(buf, "write_error")) { |
2516 | set_bit(WriteErrorSeen, &rdev->flags); | |
2517 | err = 0; | |
2518 | } else if (cmd_match(buf, "-write_error")) { | |
2519 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2520 | err = 0; | |
2d78f8c4 N |
2521 | } else if (cmd_match(buf, "want_replacement")) { |
2522 | /* Any non-spare device that is not a replacement can | |
2523 | * become want_replacement at any time, but we then need to | |
2524 | * check if recovery is needed. | |
2525 | */ | |
2526 | if (rdev->raid_disk >= 0 && | |
2527 | !test_bit(Replacement, &rdev->flags)) | |
2528 | set_bit(WantReplacement, &rdev->flags); | |
2529 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2530 | md_wakeup_thread(rdev->mddev->thread); | |
2531 | err = 0; | |
2532 | } else if (cmd_match(buf, "-want_replacement")) { | |
2533 | /* Clearing 'want_replacement' is always allowed. | |
2534 | * Once replacements starts it is too late though. | |
2535 | */ | |
2536 | err = 0; | |
2537 | clear_bit(WantReplacement, &rdev->flags); | |
2538 | } else if (cmd_match(buf, "replacement")) { | |
2539 | /* Can only set a device as a replacement when array has not | |
2540 | * yet been started. Once running, replacement is automatic | |
2541 | * from spares, or by assigning 'slot'. | |
2542 | */ | |
2543 | if (rdev->mddev->pers) | |
2544 | err = -EBUSY; | |
2545 | else { | |
2546 | set_bit(Replacement, &rdev->flags); | |
2547 | err = 0; | |
2548 | } | |
2549 | } else if (cmd_match(buf, "-replacement")) { | |
2550 | /* Similarly, can only clear Replacement before start */ | |
2551 | if (rdev->mddev->pers) | |
2552 | err = -EBUSY; | |
2553 | else { | |
2554 | clear_bit(Replacement, &rdev->flags); | |
2555 | err = 0; | |
2556 | } | |
45dc2de1 | 2557 | } |
00bcb4ac N |
2558 | if (!err) |
2559 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2560 | return err ? err : len; |
2561 | } | |
80ca3a44 N |
2562 | static struct rdev_sysfs_entry rdev_state = |
2563 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2564 | |
4dbcdc75 | 2565 | static ssize_t |
3cb03002 | 2566 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2567 | { |
2568 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2569 | } | |
2570 | ||
2571 | static ssize_t | |
3cb03002 | 2572 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 N |
2573 | { |
2574 | char *e; | |
2575 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2576 | if (*buf && (*e == 0 || *e == '\n')) { | |
2577 | atomic_set(&rdev->corrected_errors, n); | |
2578 | return len; | |
2579 | } | |
2580 | return -EINVAL; | |
2581 | } | |
2582 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2583 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2584 | |
014236d2 | 2585 | static ssize_t |
3cb03002 | 2586 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2587 | { |
2588 | if (rdev->raid_disk < 0) | |
2589 | return sprintf(page, "none\n"); | |
2590 | else | |
2591 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2592 | } | |
2593 | ||
2594 | static ssize_t | |
3cb03002 | 2595 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 N |
2596 | { |
2597 | char *e; | |
c303da6d | 2598 | int err; |
014236d2 N |
2599 | int slot = simple_strtoul(buf, &e, 10); |
2600 | if (strncmp(buf, "none", 4)==0) | |
2601 | slot = -1; | |
2602 | else if (e==buf || (*e && *e!= '\n')) | |
2603 | return -EINVAL; | |
6c2fce2e | 2604 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2605 | /* Setting 'slot' on an active array requires also |
2606 | * updating the 'rd%d' link, and communicating | |
2607 | * with the personality with ->hot_*_disk. | |
2608 | * For now we only support removing | |
2609 | * failed/spare devices. This normally happens automatically, | |
2610 | * but not when the metadata is externally managed. | |
2611 | */ | |
c303da6d N |
2612 | if (rdev->raid_disk == -1) |
2613 | return -EEXIST; | |
2614 | /* personality does all needed checks */ | |
01393f3d | 2615 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2616 | return -EINVAL; |
746d3207 N |
2617 | clear_bit(Blocked, &rdev->flags); |
2618 | remove_and_add_spares(rdev->mddev, rdev); | |
2619 | if (rdev->raid_disk >= 0) | |
2620 | return -EBUSY; | |
c303da6d N |
2621 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2622 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2623 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2624 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2625 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2626 | */ |
2627 | ||
2628 | if (rdev->raid_disk != -1) | |
2629 | return -EBUSY; | |
2630 | ||
c6751b2b N |
2631 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2632 | return -EBUSY; | |
2633 | ||
6c2fce2e NB |
2634 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2635 | return -EINVAL; | |
2636 | ||
ba1b41b6 N |
2637 | if (slot >= rdev->mddev->raid_disks && |
2638 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2639 | return -ENOSPC; | |
2640 | ||
6c2fce2e NB |
2641 | rdev->raid_disk = slot; |
2642 | if (test_bit(In_sync, &rdev->flags)) | |
2643 | rdev->saved_raid_disk = slot; | |
2644 | else | |
2645 | rdev->saved_raid_disk = -1; | |
d30519fc | 2646 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2647 | clear_bit(Bitmap_sync, &rdev->flags); |
6c2fce2e NB |
2648 | err = rdev->mddev->pers-> |
2649 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2650 | if (err) { |
6c2fce2e | 2651 | rdev->raid_disk = -1; |
6c2fce2e | 2652 | return err; |
52664732 | 2653 | } else |
00bcb4ac | 2654 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2655 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2656 | /* failure here is OK */; |
6c2fce2e | 2657 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2658 | } else { |
ba1b41b6 N |
2659 | if (slot >= rdev->mddev->raid_disks && |
2660 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2661 | return -ENOSPC; |
2662 | rdev->raid_disk = slot; | |
2663 | /* assume it is working */ | |
c5d79adb N |
2664 | clear_bit(Faulty, &rdev->flags); |
2665 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2666 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2667 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2668 | } |
014236d2 N |
2669 | return len; |
2670 | } | |
2671 | ||
014236d2 | 2672 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2673 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2674 | |
93c8cad0 | 2675 | static ssize_t |
3cb03002 | 2676 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2677 | { |
6961ece4 | 2678 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2679 | } |
2680 | ||
2681 | static ssize_t | |
3cb03002 | 2682 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2683 | { |
c6563a8c | 2684 | unsigned long long offset; |
b29bebd6 | 2685 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 2686 | return -EINVAL; |
8ed0a521 | 2687 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2688 | return -EBUSY; |
dd8ac336 | 2689 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2690 | /* Must set offset before size, so overlap checks |
2691 | * can be sane */ | |
2692 | return -EBUSY; | |
93c8cad0 | 2693 | rdev->data_offset = offset; |
25f7fd47 | 2694 | rdev->new_data_offset = offset; |
93c8cad0 N |
2695 | return len; |
2696 | } | |
2697 | ||
2698 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2699 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2700 | |
c6563a8c N |
2701 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2702 | { | |
2703 | return sprintf(page, "%llu\n", | |
2704 | (unsigned long long)rdev->new_data_offset); | |
2705 | } | |
2706 | ||
2707 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2708 | const char *buf, size_t len) | |
2709 | { | |
2710 | unsigned long long new_offset; | |
2711 | struct mddev *mddev = rdev->mddev; | |
2712 | ||
b29bebd6 | 2713 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
2714 | return -EINVAL; |
2715 | ||
f851b60d N |
2716 | if (mddev->sync_thread || |
2717 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
2718 | return -EBUSY; |
2719 | if (new_offset == rdev->data_offset) | |
2720 | /* reset is always permitted */ | |
2721 | ; | |
2722 | else if (new_offset > rdev->data_offset) { | |
2723 | /* must not push array size beyond rdev_sectors */ | |
2724 | if (new_offset - rdev->data_offset | |
2725 | + mddev->dev_sectors > rdev->sectors) | |
2726 | return -E2BIG; | |
2727 | } | |
2728 | /* Metadata worries about other space details. */ | |
2729 | ||
2730 | /* decreasing the offset is inconsistent with a backwards | |
2731 | * reshape. | |
2732 | */ | |
2733 | if (new_offset < rdev->data_offset && | |
2734 | mddev->reshape_backwards) | |
2735 | return -EINVAL; | |
2736 | /* Increasing offset is inconsistent with forwards | |
2737 | * reshape. reshape_direction should be set to | |
2738 | * 'backwards' first. | |
2739 | */ | |
2740 | if (new_offset > rdev->data_offset && | |
2741 | !mddev->reshape_backwards) | |
2742 | return -EINVAL; | |
2743 | ||
2744 | if (mddev->pers && mddev->persistent && | |
2745 | !super_types[mddev->major_version] | |
2746 | .allow_new_offset(rdev, new_offset)) | |
2747 | return -E2BIG; | |
2748 | rdev->new_data_offset = new_offset; | |
2749 | if (new_offset > rdev->data_offset) | |
2750 | mddev->reshape_backwards = 1; | |
2751 | else if (new_offset < rdev->data_offset) | |
2752 | mddev->reshape_backwards = 0; | |
2753 | ||
2754 | return len; | |
2755 | } | |
2756 | static struct rdev_sysfs_entry rdev_new_offset = | |
2757 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2758 | ||
83303b61 | 2759 | static ssize_t |
3cb03002 | 2760 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2761 | { |
dd8ac336 | 2762 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2763 | } |
2764 | ||
c5d79adb N |
2765 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2766 | { | |
2767 | /* check if two start/length pairs overlap */ | |
2768 | if (s1+l1 <= s2) | |
2769 | return 0; | |
2770 | if (s2+l2 <= s1) | |
2771 | return 0; | |
2772 | return 1; | |
2773 | } | |
2774 | ||
b522adcd DW |
2775 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2776 | { | |
2777 | unsigned long long blocks; | |
2778 | sector_t new; | |
2779 | ||
b29bebd6 | 2780 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
2781 | return -EINVAL; |
2782 | ||
2783 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2784 | return -EINVAL; /* sector conversion overflow */ | |
2785 | ||
2786 | new = blocks * 2; | |
2787 | if (new != blocks * 2) | |
2788 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2789 | ||
2790 | *sectors = new; | |
2791 | return 0; | |
2792 | } | |
2793 | ||
83303b61 | 2794 | static ssize_t |
3cb03002 | 2795 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2796 | { |
fd01b88c | 2797 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2798 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2799 | sector_t sectors; |
27c529bb | 2800 | |
b522adcd | 2801 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2802 | return -EINVAL; |
c6563a8c N |
2803 | if (rdev->data_offset != rdev->new_data_offset) |
2804 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2805 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2806 | if (my_mddev->persistent) { |
dd8ac336 AN |
2807 | sectors = super_types[my_mddev->major_version]. |
2808 | rdev_size_change(rdev, sectors); | |
2809 | if (!sectors) | |
0cd17fec | 2810 | return -EBUSY; |
dd8ac336 | 2811 | } else if (!sectors) |
77304d2a | 2812 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2813 | rdev->data_offset; |
a6468539 N |
2814 | if (!my_mddev->pers->resize) |
2815 | /* Cannot change size for RAID0 or Linear etc */ | |
2816 | return -EINVAL; | |
0cd17fec | 2817 | } |
dd8ac336 | 2818 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2819 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2820 | |
dd8ac336 AN |
2821 | rdev->sectors = sectors; |
2822 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
2823 | /* Need to check that all other rdevs with the same |
2824 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
2825 | * the rdev lists safely. | |
2826 | * This check does not provide a hard guarantee, it | |
2827 | * just helps avoid dangerous mistakes. | |
c5d79adb | 2828 | */ |
fd01b88c | 2829 | struct mddev *mddev; |
c5d79adb | 2830 | int overlap = 0; |
159ec1fc | 2831 | struct list_head *tmp; |
c5d79adb | 2832 | |
8b1afc3d | 2833 | rcu_read_lock(); |
29ac4aa3 | 2834 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2835 | struct md_rdev *rdev2; |
c5d79adb | 2836 | |
dafb20fa | 2837 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
2838 | if (rdev->bdev == rdev2->bdev && |
2839 | rdev != rdev2 && | |
2840 | overlaps(rdev->data_offset, rdev->sectors, | |
2841 | rdev2->data_offset, | |
2842 | rdev2->sectors)) { | |
c5d79adb N |
2843 | overlap = 1; |
2844 | break; | |
2845 | } | |
c5d79adb N |
2846 | if (overlap) { |
2847 | mddev_put(mddev); | |
2848 | break; | |
2849 | } | |
2850 | } | |
8b1afc3d | 2851 | rcu_read_unlock(); |
c5d79adb N |
2852 | if (overlap) { |
2853 | /* Someone else could have slipped in a size | |
2854 | * change here, but doing so is just silly. | |
dd8ac336 | 2855 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2856 | * safe, and trust userspace not to race with |
2857 | * itself | |
2858 | */ | |
dd8ac336 | 2859 | rdev->sectors = oldsectors; |
c5d79adb N |
2860 | return -EBUSY; |
2861 | } | |
2862 | } | |
83303b61 N |
2863 | return len; |
2864 | } | |
2865 | ||
2866 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2867 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2868 | |
3cb03002 | 2869 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
2870 | { |
2871 | unsigned long long recovery_start = rdev->recovery_offset; | |
2872 | ||
2873 | if (test_bit(In_sync, &rdev->flags) || | |
2874 | recovery_start == MaxSector) | |
2875 | return sprintf(page, "none\n"); | |
2876 | ||
2877 | return sprintf(page, "%llu\n", recovery_start); | |
2878 | } | |
2879 | ||
3cb03002 | 2880 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
2881 | { |
2882 | unsigned long long recovery_start; | |
2883 | ||
2884 | if (cmd_match(buf, "none")) | |
2885 | recovery_start = MaxSector; | |
b29bebd6 | 2886 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
2887 | return -EINVAL; |
2888 | ||
2889 | if (rdev->mddev->pers && | |
2890 | rdev->raid_disk >= 0) | |
2891 | return -EBUSY; | |
2892 | ||
2893 | rdev->recovery_offset = recovery_start; | |
2894 | if (recovery_start == MaxSector) | |
2895 | set_bit(In_sync, &rdev->flags); | |
2896 | else | |
2897 | clear_bit(In_sync, &rdev->flags); | |
2898 | return len; | |
2899 | } | |
2900 | ||
2901 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2902 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2903 | ||
16c791a5 N |
2904 | static ssize_t |
2905 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2906 | static ssize_t | |
2907 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2908 | ||
3cb03002 | 2909 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2910 | { |
2911 | return badblocks_show(&rdev->badblocks, page, 0); | |
2912 | } | |
3cb03002 | 2913 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 2914 | { |
de393cde N |
2915 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
2916 | /* Maybe that ack was all we needed */ | |
2917 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
2918 | wake_up(&rdev->blocked_wait); | |
2919 | return rv; | |
16c791a5 N |
2920 | } |
2921 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2922 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2923 | ||
3cb03002 | 2924 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2925 | { |
2926 | return badblocks_show(&rdev->badblocks, page, 1); | |
2927 | } | |
3cb03002 | 2928 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
2929 | { |
2930 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2931 | } | |
2932 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
2933 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
2934 | ||
86e6ffdd N |
2935 | static struct attribute *rdev_default_attrs[] = { |
2936 | &rdev_state.attr, | |
4dbcdc75 | 2937 | &rdev_errors.attr, |
014236d2 | 2938 | &rdev_slot.attr, |
93c8cad0 | 2939 | &rdev_offset.attr, |
c6563a8c | 2940 | &rdev_new_offset.attr, |
83303b61 | 2941 | &rdev_size.attr, |
06e3c817 | 2942 | &rdev_recovery_start.attr, |
16c791a5 N |
2943 | &rdev_bad_blocks.attr, |
2944 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
2945 | NULL, |
2946 | }; | |
2947 | static ssize_t | |
2948 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2949 | { | |
2950 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2951 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
86e6ffdd N |
2952 | |
2953 | if (!entry->show) | |
2954 | return -EIO; | |
758bfc8a N |
2955 | if (!rdev->mddev) |
2956 | return -EBUSY; | |
2957 | return entry->show(rdev, page); | |
86e6ffdd N |
2958 | } |
2959 | ||
2960 | static ssize_t | |
2961 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2962 | const char *page, size_t length) | |
2963 | { | |
2964 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2965 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 2966 | ssize_t rv; |
fd01b88c | 2967 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
2968 | |
2969 | if (!entry->store) | |
2970 | return -EIO; | |
67463acb N |
2971 | if (!capable(CAP_SYS_ADMIN)) |
2972 | return -EACCES; | |
27c529bb | 2973 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2974 | if (!rv) { |
27c529bb N |
2975 | if (rdev->mddev == NULL) |
2976 | rv = -EBUSY; | |
2977 | else | |
2978 | rv = entry->store(rdev, page, length); | |
6a51830e | 2979 | mddev_unlock(mddev); |
ca388059 N |
2980 | } |
2981 | return rv; | |
86e6ffdd N |
2982 | } |
2983 | ||
2984 | static void rdev_free(struct kobject *ko) | |
2985 | { | |
3cb03002 | 2986 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
2987 | kfree(rdev); |
2988 | } | |
52cf25d0 | 2989 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2990 | .show = rdev_attr_show, |
2991 | .store = rdev_attr_store, | |
2992 | }; | |
2993 | static struct kobj_type rdev_ktype = { | |
2994 | .release = rdev_free, | |
2995 | .sysfs_ops = &rdev_sysfs_ops, | |
2996 | .default_attrs = rdev_default_attrs, | |
2997 | }; | |
2998 | ||
3cb03002 | 2999 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3000 | { |
3001 | rdev->desc_nr = -1; | |
3002 | rdev->saved_raid_disk = -1; | |
3003 | rdev->raid_disk = -1; | |
3004 | rdev->flags = 0; | |
3005 | rdev->data_offset = 0; | |
c6563a8c | 3006 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3007 | rdev->sb_events = 0; |
3008 | rdev->last_read_error.tv_sec = 0; | |
3009 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3010 | rdev->sb_loaded = 0; |
3011 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3012 | atomic_set(&rdev->nr_pending, 0); |
3013 | atomic_set(&rdev->read_errors, 0); | |
3014 | atomic_set(&rdev->corrected_errors, 0); | |
3015 | ||
3016 | INIT_LIST_HEAD(&rdev->same_set); | |
3017 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3018 | |
3019 | /* Add space to store bad block list. | |
3020 | * This reserves the space even on arrays where it cannot | |
3021 | * be used - I wonder if that matters | |
3022 | */ | |
3023 | rdev->badblocks.count = 0; | |
486adf72 | 3024 | rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
2230dfe4 N |
3025 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3026 | seqlock_init(&rdev->badblocks.lock); | |
3027 | if (rdev->badblocks.page == NULL) | |
3028 | return -ENOMEM; | |
3029 | ||
3030 | return 0; | |
e8bb9a83 N |
3031 | } |
3032 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3033 | /* |
3034 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3035 | * | |
3036 | * mark the device faulty if: | |
3037 | * | |
3038 | * - the device is nonexistent (zero size) | |
3039 | * - the device has no valid superblock | |
3040 | * | |
3041 | * a faulty rdev _never_ has rdev->sb set. | |
3042 | */ | |
3cb03002 | 3043 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3044 | { |
3045 | char b[BDEVNAME_SIZE]; | |
3046 | int err; | |
3cb03002 | 3047 | struct md_rdev *rdev; |
1da177e4 LT |
3048 | sector_t size; |
3049 | ||
9ffae0cf | 3050 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3051 | if (!rdev) { |
3052 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3053 | return ERR_PTR(-ENOMEM); | |
3054 | } | |
1da177e4 | 3055 | |
2230dfe4 N |
3056 | err = md_rdev_init(rdev); |
3057 | if (err) | |
3058 | goto abort_free; | |
3059 | err = alloc_disk_sb(rdev); | |
3060 | if (err) | |
1da177e4 LT |
3061 | goto abort_free; |
3062 | ||
c5d79adb | 3063 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3064 | if (err) |
3065 | goto abort_free; | |
3066 | ||
f9cb074b | 3067 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3068 | |
77304d2a | 3069 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3070 | if (!size) { |
f72ffdd6 | 3071 | printk(KERN_WARNING |
1da177e4 LT |
3072 | "md: %s has zero or unknown size, marking faulty!\n", |
3073 | bdevname(rdev->bdev,b)); | |
3074 | err = -EINVAL; | |
3075 | goto abort_free; | |
3076 | } | |
3077 | ||
3078 | if (super_format >= 0) { | |
3079 | err = super_types[super_format]. | |
3080 | load_super(rdev, NULL, super_minor); | |
3081 | if (err == -EINVAL) { | |
df968c4e N |
3082 | printk(KERN_WARNING |
3083 | "md: %s does not have a valid v%d.%d " | |
3084 | "superblock, not importing!\n", | |
3085 | bdevname(rdev->bdev,b), | |
3086 | super_format, super_minor); | |
1da177e4 LT |
3087 | goto abort_free; |
3088 | } | |
3089 | if (err < 0) { | |
f72ffdd6 | 3090 | printk(KERN_WARNING |
1da177e4 LT |
3091 | "md: could not read %s's sb, not importing!\n", |
3092 | bdevname(rdev->bdev,b)); | |
3093 | goto abort_free; | |
3094 | } | |
3095 | } | |
6bfe0b49 | 3096 | |
1da177e4 LT |
3097 | return rdev; |
3098 | ||
3099 | abort_free: | |
2699b672 N |
3100 | if (rdev->bdev) |
3101 | unlock_rdev(rdev); | |
545c8795 | 3102 | md_rdev_clear(rdev); |
1da177e4 LT |
3103 | kfree(rdev); |
3104 | return ERR_PTR(err); | |
3105 | } | |
3106 | ||
3107 | /* | |
3108 | * Check a full RAID array for plausibility | |
3109 | */ | |
3110 | ||
f72ffdd6 | 3111 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3112 | { |
3113 | int i; | |
3cb03002 | 3114 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3115 | char b[BDEVNAME_SIZE]; |
3116 | ||
3117 | freshest = NULL; | |
dafb20fa | 3118 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3119 | switch (super_types[mddev->major_version]. |
3120 | load_super(rdev, freshest, mddev->minor_version)) { | |
3121 | case 1: | |
3122 | freshest = rdev; | |
3123 | break; | |
3124 | case 0: | |
3125 | break; | |
3126 | default: | |
3127 | printk( KERN_ERR \ | |
3128 | "md: fatal superblock inconsistency in %s" | |
f72ffdd6 | 3129 | " -- removing from array\n", |
1da177e4 LT |
3130 | bdevname(rdev->bdev,b)); |
3131 | kick_rdev_from_array(rdev); | |
3132 | } | |
3133 | ||
1da177e4 LT |
3134 | super_types[mddev->major_version]. |
3135 | validate_super(mddev, freshest); | |
3136 | ||
3137 | i = 0; | |
dafb20fa | 3138 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3139 | if (mddev->max_disks && |
3140 | (rdev->desc_nr >= mddev->max_disks || | |
3141 | i > mddev->max_disks)) { | |
de01dfad N |
3142 | printk(KERN_WARNING |
3143 | "md: %s: %s: only %d devices permitted\n", | |
3144 | mdname(mddev), bdevname(rdev->bdev, b), | |
3145 | mddev->max_disks); | |
3146 | kick_rdev_from_array(rdev); | |
3147 | continue; | |
3148 | } | |
1da177e4 LT |
3149 | if (rdev != freshest) |
3150 | if (super_types[mddev->major_version]. | |
3151 | validate_super(mddev, rdev)) { | |
3152 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3153 | " from array!\n", | |
3154 | bdevname(rdev->bdev,b)); | |
3155 | kick_rdev_from_array(rdev); | |
3156 | continue; | |
3157 | } | |
3158 | if (mddev->level == LEVEL_MULTIPATH) { | |
3159 | rdev->desc_nr = i++; | |
3160 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3161 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3162 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3163 | rdev->raid_disk = -1; |
3164 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3165 | } |
3166 | } | |
1da177e4 LT |
3167 | } |
3168 | ||
72e02075 N |
3169 | /* Read a fixed-point number. |
3170 | * Numbers in sysfs attributes should be in "standard" units where | |
3171 | * possible, so time should be in seconds. | |
f72ffdd6 | 3172 | * However we internally use a a much smaller unit such as |
72e02075 N |
3173 | * milliseconds or jiffies. |
3174 | * This function takes a decimal number with a possible fractional | |
3175 | * component, and produces an integer which is the result of | |
3176 | * multiplying that number by 10^'scale'. | |
3177 | * all without any floating-point arithmetic. | |
3178 | */ | |
3179 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3180 | { | |
3181 | unsigned long result = 0; | |
3182 | long decimals = -1; | |
3183 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3184 | if (*cp == '.') | |
3185 | decimals = 0; | |
3186 | else if (decimals < scale) { | |
3187 | unsigned int value; | |
3188 | value = *cp - '0'; | |
3189 | result = result * 10 + value; | |
3190 | if (decimals >= 0) | |
3191 | decimals++; | |
3192 | } | |
3193 | cp++; | |
3194 | } | |
3195 | if (*cp == '\n') | |
3196 | cp++; | |
3197 | if (*cp) | |
3198 | return -EINVAL; | |
3199 | if (decimals < 0) | |
3200 | decimals = 0; | |
3201 | while (decimals < scale) { | |
3202 | result *= 10; | |
3203 | decimals ++; | |
3204 | } | |
3205 | *res = result; | |
3206 | return 0; | |
3207 | } | |
3208 | ||
19052c0e N |
3209 | static void md_safemode_timeout(unsigned long data); |
3210 | ||
16f17b39 | 3211 | static ssize_t |
fd01b88c | 3212 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3213 | { |
3214 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3215 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3216 | } | |
3217 | static ssize_t | |
fd01b88c | 3218 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3219 | { |
16f17b39 | 3220 | unsigned long msec; |
97ce0a7f | 3221 | |
72e02075 | 3222 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3223 | return -EINVAL; |
16f17b39 N |
3224 | if (msec == 0) |
3225 | mddev->safemode_delay = 0; | |
3226 | else { | |
19052c0e | 3227 | unsigned long old_delay = mddev->safemode_delay; |
1b30e66f N |
3228 | unsigned long new_delay = (msec*HZ)/1000; |
3229 | ||
3230 | if (new_delay == 0) | |
3231 | new_delay = 1; | |
3232 | mddev->safemode_delay = new_delay; | |
3233 | if (new_delay < old_delay || old_delay == 0) | |
3234 | mod_timer(&mddev->safemode_timer, jiffies+1); | |
16f17b39 N |
3235 | } |
3236 | return len; | |
3237 | } | |
3238 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3239 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3240 | |
eae1701f | 3241 | static ssize_t |
fd01b88c | 3242 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3243 | { |
36d091f4 N |
3244 | struct md_personality *p; |
3245 | int ret; | |
3246 | spin_lock(&mddev->lock); | |
3247 | p = mddev->pers; | |
d9d166c2 | 3248 | if (p) |
36d091f4 | 3249 | ret = sprintf(page, "%s\n", p->name); |
d9d166c2 | 3250 | else if (mddev->clevel[0]) |
36d091f4 | 3251 | ret = sprintf(page, "%s\n", mddev->clevel); |
d9d166c2 | 3252 | else if (mddev->level != LEVEL_NONE) |
36d091f4 | 3253 | ret = sprintf(page, "%d\n", mddev->level); |
d9d166c2 | 3254 | else |
36d091f4 N |
3255 | ret = 0; |
3256 | spin_unlock(&mddev->lock); | |
3257 | return ret; | |
eae1701f N |
3258 | } |
3259 | ||
d9d166c2 | 3260 | static ssize_t |
fd01b88c | 3261 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3262 | { |
f2859af6 | 3263 | char clevel[16]; |
6791875e N |
3264 | ssize_t rv; |
3265 | size_t slen = len; | |
db721d32 | 3266 | struct md_personality *pers, *oldpers; |
f2859af6 | 3267 | long level; |
db721d32 | 3268 | void *priv, *oldpriv; |
3cb03002 | 3269 | struct md_rdev *rdev; |
245f46c2 | 3270 | |
6791875e N |
3271 | if (slen == 0 || slen >= sizeof(clevel)) |
3272 | return -EINVAL; | |
3273 | ||
3274 | rv = mddev_lock(mddev); | |
3275 | if (rv) | |
3276 | return rv; | |
3277 | ||
245f46c2 | 3278 | if (mddev->pers == NULL) { |
6791875e N |
3279 | strncpy(mddev->clevel, buf, slen); |
3280 | if (mddev->clevel[slen-1] == '\n') | |
3281 | slen--; | |
3282 | mddev->clevel[slen] = 0; | |
245f46c2 | 3283 | mddev->level = LEVEL_NONE; |
6791875e N |
3284 | rv = len; |
3285 | goto out_unlock; | |
245f46c2 | 3286 | } |
6791875e | 3287 | rv = -EROFS; |
bd8839e0 | 3288 | if (mddev->ro) |
6791875e | 3289 | goto out_unlock; |
245f46c2 N |
3290 | |
3291 | /* request to change the personality. Need to ensure: | |
3292 | * - array is not engaged in resync/recovery/reshape | |
3293 | * - old personality can be suspended | |
3294 | * - new personality will access other array. | |
3295 | */ | |
3296 | ||
6791875e | 3297 | rv = -EBUSY; |
bb4f1e9d | 3298 | if (mddev->sync_thread || |
f851b60d | 3299 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3300 | mddev->reshape_position != MaxSector || |
3301 | mddev->sysfs_active) | |
6791875e | 3302 | goto out_unlock; |
245f46c2 | 3303 | |
6791875e | 3304 | rv = -EINVAL; |
245f46c2 N |
3305 | if (!mddev->pers->quiesce) { |
3306 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3307 | mdname(mddev), mddev->pers->name); | |
6791875e | 3308 | goto out_unlock; |
245f46c2 N |
3309 | } |
3310 | ||
3311 | /* Now find the new personality */ | |
6791875e N |
3312 | strncpy(clevel, buf, slen); |
3313 | if (clevel[slen-1] == '\n') | |
3314 | slen--; | |
3315 | clevel[slen] = 0; | |
b29bebd6 | 3316 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3317 | level = LEVEL_NONE; |
245f46c2 | 3318 | |
f2859af6 DW |
3319 | if (request_module("md-%s", clevel) != 0) |
3320 | request_module("md-level-%s", clevel); | |
245f46c2 | 3321 | spin_lock(&pers_lock); |
f2859af6 | 3322 | pers = find_pers(level, clevel); |
245f46c2 N |
3323 | if (!pers || !try_module_get(pers->owner)) { |
3324 | spin_unlock(&pers_lock); | |
f2859af6 | 3325 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
6791875e N |
3326 | rv = -EINVAL; |
3327 | goto out_unlock; | |
245f46c2 N |
3328 | } |
3329 | spin_unlock(&pers_lock); | |
3330 | ||
3331 | if (pers == mddev->pers) { | |
3332 | /* Nothing to do! */ | |
3333 | module_put(pers->owner); | |
6791875e N |
3334 | rv = len; |
3335 | goto out_unlock; | |
245f46c2 N |
3336 | } |
3337 | if (!pers->takeover) { | |
3338 | module_put(pers->owner); | |
3339 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3340 | mdname(mddev), clevel); |
6791875e N |
3341 | rv = -EINVAL; |
3342 | goto out_unlock; | |
245f46c2 N |
3343 | } |
3344 | ||
dafb20fa | 3345 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3346 | rdev->new_raid_disk = rdev->raid_disk; |
3347 | ||
245f46c2 N |
3348 | /* ->takeover must set new_* and/or delta_disks |
3349 | * if it succeeds, and may set them when it fails. | |
3350 | */ | |
3351 | priv = pers->takeover(mddev); | |
3352 | if (IS_ERR(priv)) { | |
3353 | mddev->new_level = mddev->level; | |
3354 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3355 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3356 | mddev->raid_disks -= mddev->delta_disks; |
3357 | mddev->delta_disks = 0; | |
2c810cdd | 3358 | mddev->reshape_backwards = 0; |
245f46c2 N |
3359 | module_put(pers->owner); |
3360 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3361 | mdname(mddev), clevel); |
6791875e N |
3362 | rv = PTR_ERR(priv); |
3363 | goto out_unlock; | |
245f46c2 N |
3364 | } |
3365 | ||
3366 | /* Looks like we have a winner */ | |
3367 | mddev_suspend(mddev); | |
5aa61f42 | 3368 | mddev_detach(mddev); |
36d091f4 N |
3369 | |
3370 | spin_lock(&mddev->lock); | |
db721d32 N |
3371 | oldpers = mddev->pers; |
3372 | oldpriv = mddev->private; | |
3373 | mddev->pers = pers; | |
3374 | mddev->private = priv; | |
3375 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3376 | mddev->level = mddev->new_level; | |
3377 | mddev->layout = mddev->new_layout; | |
3378 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
3379 | mddev->delta_disks = 0; | |
3380 | mddev->reshape_backwards = 0; | |
3381 | mddev->degraded = 0; | |
36d091f4 | 3382 | spin_unlock(&mddev->lock); |
db721d32 N |
3383 | |
3384 | if (oldpers->sync_request == NULL && | |
3385 | mddev->external) { | |
3386 | /* We are converting from a no-redundancy array | |
3387 | * to a redundancy array and metadata is managed | |
3388 | * externally so we need to be sure that writes | |
3389 | * won't block due to a need to transition | |
3390 | * clean->dirty | |
3391 | * until external management is started. | |
3392 | */ | |
3393 | mddev->in_sync = 0; | |
3394 | mddev->safemode_delay = 0; | |
3395 | mddev->safemode = 0; | |
3396 | } | |
f72ffdd6 | 3397 | |
db721d32 N |
3398 | oldpers->free(mddev, oldpriv); |
3399 | ||
3400 | if (oldpers->sync_request == NULL && | |
a64c876f N |
3401 | pers->sync_request != NULL) { |
3402 | /* need to add the md_redundancy_group */ | |
3403 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3404 | printk(KERN_WARNING | |
3405 | "md: cannot register extra attributes for %s\n", | |
3406 | mdname(mddev)); | |
388975cc | 3407 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3408 | } |
db721d32 | 3409 | if (oldpers->sync_request != NULL && |
a64c876f N |
3410 | pers->sync_request == NULL) { |
3411 | /* need to remove the md_redundancy_group */ | |
3412 | if (mddev->to_remove == NULL) | |
3413 | mddev->to_remove = &md_redundancy_group; | |
3414 | } | |
3415 | ||
dafb20fa | 3416 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3417 | if (rdev->raid_disk < 0) |
3418 | continue; | |
bf2cb0da | 3419 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3420 | rdev->new_raid_disk = -1; |
3421 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3422 | continue; | |
36fad858 | 3423 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3424 | } |
dafb20fa | 3425 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3426 | if (rdev->raid_disk < 0) |
3427 | continue; | |
3428 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3429 | continue; | |
3430 | rdev->raid_disk = rdev->new_raid_disk; | |
3431 | if (rdev->raid_disk < 0) | |
3a981b03 | 3432 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3433 | else { |
36fad858 NK |
3434 | if (sysfs_link_rdev(mddev, rdev)) |
3435 | printk(KERN_WARNING "md: cannot register rd%d" | |
3436 | " for %s after level change\n", | |
3437 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3438 | } |
e93f68a1 N |
3439 | } |
3440 | ||
db721d32 | 3441 | if (pers->sync_request == NULL) { |
9af204cf TM |
3442 | /* this is now an array without redundancy, so |
3443 | * it must always be in_sync | |
3444 | */ | |
3445 | mddev->in_sync = 1; | |
3446 | del_timer_sync(&mddev->safemode_timer); | |
3447 | } | |
02e5f5c0 | 3448 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3449 | pers->run(mddev); |
245f46c2 | 3450 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3451 | mddev_resume(mddev); |
830778a1 N |
3452 | if (!mddev->thread) |
3453 | md_update_sb(mddev, 1); | |
5cac7861 | 3454 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3455 | md_new_event(mddev); |
6791875e N |
3456 | rv = len; |
3457 | out_unlock: | |
3458 | mddev_unlock(mddev); | |
d9d166c2 N |
3459 | return rv; |
3460 | } | |
3461 | ||
3462 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3463 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3464 | |
d4dbd025 | 3465 | static ssize_t |
fd01b88c | 3466 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3467 | { |
3468 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3469 | if (mddev->reshape_position != MaxSector && |
3470 | mddev->layout != mddev->new_layout) | |
3471 | return sprintf(page, "%d (%d)\n", | |
3472 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3473 | return sprintf(page, "%d\n", mddev->layout); |
3474 | } | |
3475 | ||
3476 | static ssize_t | |
fd01b88c | 3477 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 N |
3478 | { |
3479 | char *e; | |
3480 | unsigned long n = simple_strtoul(buf, &e, 10); | |
6791875e | 3481 | int err; |
d4dbd025 N |
3482 | |
3483 | if (!*buf || (*e && *e != '\n')) | |
3484 | return -EINVAL; | |
6791875e N |
3485 | err = mddev_lock(mddev); |
3486 | if (err) | |
3487 | return err; | |
d4dbd025 | 3488 | |
b3546035 | 3489 | if (mddev->pers) { |
50ac168a | 3490 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3491 | err = -EBUSY; |
3492 | else if (mddev->ro) | |
3493 | err = -EROFS; | |
3494 | else { | |
3495 | mddev->new_layout = n; | |
3496 | err = mddev->pers->check_reshape(mddev); | |
3497 | if (err) | |
3498 | mddev->new_layout = mddev->layout; | |
597a711b | 3499 | } |
b3546035 | 3500 | } else { |
08a02ecd | 3501 | mddev->new_layout = n; |
b3546035 N |
3502 | if (mddev->reshape_position == MaxSector) |
3503 | mddev->layout = n; | |
3504 | } | |
6791875e N |
3505 | mddev_unlock(mddev); |
3506 | return err ?: len; | |
d4dbd025 N |
3507 | } |
3508 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3509 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3510 | |
eae1701f | 3511 | static ssize_t |
fd01b88c | 3512 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3513 | { |
bb636547 N |
3514 | if (mddev->raid_disks == 0) |
3515 | return 0; | |
08a02ecd N |
3516 | if (mddev->reshape_position != MaxSector && |
3517 | mddev->delta_disks != 0) | |
3518 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3519 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3520 | return sprintf(page, "%d\n", mddev->raid_disks); |
3521 | } | |
3522 | ||
fd01b88c | 3523 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3524 | |
3525 | static ssize_t | |
fd01b88c | 3526 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3527 | { |
da943b99 | 3528 | char *e; |
6791875e | 3529 | int err; |
da943b99 N |
3530 | unsigned long n = simple_strtoul(buf, &e, 10); |
3531 | ||
3532 | if (!*buf || (*e && *e != '\n')) | |
3533 | return -EINVAL; | |
3534 | ||
6791875e N |
3535 | err = mddev_lock(mddev); |
3536 | if (err) | |
3537 | return err; | |
da943b99 | 3538 | if (mddev->pers) |
6791875e | 3539 | err = update_raid_disks(mddev, n); |
08a02ecd | 3540 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3541 | struct md_rdev *rdev; |
08a02ecd | 3542 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c | 3543 | |
6791875e | 3544 | err = -EINVAL; |
c6563a8c N |
3545 | rdev_for_each(rdev, mddev) { |
3546 | if (olddisks < n && | |
3547 | rdev->data_offset < rdev->new_data_offset) | |
6791875e | 3548 | goto out_unlock; |
c6563a8c N |
3549 | if (olddisks > n && |
3550 | rdev->data_offset > rdev->new_data_offset) | |
6791875e | 3551 | goto out_unlock; |
c6563a8c | 3552 | } |
6791875e | 3553 | err = 0; |
08a02ecd N |
3554 | mddev->delta_disks = n - olddisks; |
3555 | mddev->raid_disks = n; | |
2c810cdd | 3556 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3557 | } else |
da943b99 | 3558 | mddev->raid_disks = n; |
6791875e N |
3559 | out_unlock: |
3560 | mddev_unlock(mddev); | |
3561 | return err ? err : len; | |
da943b99 N |
3562 | } |
3563 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3564 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3565 | |
3b34380a | 3566 | static ssize_t |
fd01b88c | 3567 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3568 | { |
08a02ecd | 3569 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3570 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3571 | return sprintf(page, "%d (%d)\n", | |
3572 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3573 | mddev->chunk_sectors << 9); |
3574 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3575 | } |
3576 | ||
3577 | static ssize_t | |
fd01b88c | 3578 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3579 | { |
6791875e | 3580 | int err; |
3b34380a N |
3581 | char *e; |
3582 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3583 | ||
3b34380a N |
3584 | if (!*buf || (*e && *e != '\n')) |
3585 | return -EINVAL; | |
3586 | ||
6791875e N |
3587 | err = mddev_lock(mddev); |
3588 | if (err) | |
3589 | return err; | |
b3546035 | 3590 | if (mddev->pers) { |
50ac168a | 3591 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3592 | err = -EBUSY; |
3593 | else if (mddev->ro) | |
3594 | err = -EROFS; | |
3595 | else { | |
3596 | mddev->new_chunk_sectors = n >> 9; | |
3597 | err = mddev->pers->check_reshape(mddev); | |
3598 | if (err) | |
3599 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
597a711b | 3600 | } |
b3546035 | 3601 | } else { |
664e7c41 | 3602 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3603 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3604 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3605 | } |
6791875e N |
3606 | mddev_unlock(mddev); |
3607 | return err ?: len; | |
3b34380a N |
3608 | } |
3609 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3610 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3611 | |
a94213b1 | 3612 | static ssize_t |
fd01b88c | 3613 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3614 | { |
d1a7c503 N |
3615 | if (mddev->recovery_cp == MaxSector) |
3616 | return sprintf(page, "none\n"); | |
a94213b1 N |
3617 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3618 | } | |
3619 | ||
3620 | static ssize_t | |
fd01b88c | 3621 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3622 | { |
6791875e | 3623 | int err; |
a94213b1 N |
3624 | char *e; |
3625 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3626 | ||
6791875e N |
3627 | err = mddev_lock(mddev); |
3628 | if (err) | |
3629 | return err; | |
b098636c | 3630 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6791875e N |
3631 | err = -EBUSY; |
3632 | else if (cmd_match(buf, "none")) | |
06e3c817 DW |
3633 | n = MaxSector; |
3634 | else if (!*buf || (*e && *e != '\n')) | |
6791875e | 3635 | err = -EINVAL; |
a94213b1 | 3636 | |
6791875e N |
3637 | if (!err) { |
3638 | mddev->recovery_cp = n; | |
3639 | if (mddev->pers) | |
3640 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3641 | } | |
3642 | mddev_unlock(mddev); | |
3643 | return err ?: len; | |
a94213b1 N |
3644 | } |
3645 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3646 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3647 | |
9e653b63 N |
3648 | /* |
3649 | * The array state can be: | |
3650 | * | |
3651 | * clear | |
3652 | * No devices, no size, no level | |
3653 | * Equivalent to STOP_ARRAY ioctl | |
3654 | * inactive | |
3655 | * May have some settings, but array is not active | |
3656 | * all IO results in error | |
3657 | * When written, doesn't tear down array, but just stops it | |
3658 | * suspended (not supported yet) | |
3659 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3660 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3661 | * readonly |
3662 | * no resync can happen. no superblocks get written. | |
3663 | * write requests fail | |
3664 | * read-auto | |
3665 | * like readonly, but behaves like 'clean' on a write request. | |
3666 | * | |
3667 | * clean - no pending writes, but otherwise active. | |
3668 | * When written to inactive array, starts without resync | |
3669 | * If a write request arrives then | |
3670 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3671 | * if not known, block and switch to write-pending | |
3672 | * If written to an active array that has pending writes, then fails. | |
3673 | * active | |
3674 | * fully active: IO and resync can be happening. | |
3675 | * When written to inactive array, starts with resync | |
3676 | * | |
3677 | * write-pending | |
3678 | * clean, but writes are blocked waiting for 'active' to be written. | |
3679 | * | |
3680 | * active-idle | |
3681 | * like active, but no writes have been seen for a while (100msec). | |
3682 | * | |
3683 | */ | |
3684 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3685 | write_pending, active_idle, bad_word}; | |
05381954 | 3686 | static char *array_states[] = { |
9e653b63 N |
3687 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3688 | "write-pending", "active-idle", NULL }; | |
3689 | ||
3690 | static int match_word(const char *word, char **list) | |
3691 | { | |
3692 | int n; | |
3693 | for (n=0; list[n]; n++) | |
3694 | if (cmd_match(word, list[n])) | |
3695 | break; | |
3696 | return n; | |
3697 | } | |
3698 | ||
3699 | static ssize_t | |
fd01b88c | 3700 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3701 | { |
3702 | enum array_state st = inactive; | |
3703 | ||
3704 | if (mddev->pers) | |
3705 | switch(mddev->ro) { | |
3706 | case 1: | |
3707 | st = readonly; | |
3708 | break; | |
3709 | case 2: | |
3710 | st = read_auto; | |
3711 | break; | |
3712 | case 0: | |
3713 | if (mddev->in_sync) | |
3714 | st = clean; | |
070dc6dd | 3715 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3716 | st = write_pending; |
9e653b63 N |
3717 | else if (mddev->safemode) |
3718 | st = active_idle; | |
3719 | else | |
3720 | st = active; | |
3721 | } | |
3722 | else { | |
3723 | if (list_empty(&mddev->disks) && | |
3724 | mddev->raid_disks == 0 && | |
58c0fed4 | 3725 | mddev->dev_sectors == 0) |
9e653b63 N |
3726 | st = clear; |
3727 | else | |
3728 | st = inactive; | |
3729 | } | |
3730 | return sprintf(page, "%s\n", array_states[st]); | |
3731 | } | |
3732 | ||
f72ffdd6 N |
3733 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
3734 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
3735 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 3736 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
3737 | |
3738 | static ssize_t | |
fd01b88c | 3739 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 | 3740 | { |
6791875e | 3741 | int err; |
9e653b63 | 3742 | enum array_state st = match_word(buf, array_states); |
6791875e N |
3743 | |
3744 | if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { | |
3745 | /* don't take reconfig_mutex when toggling between | |
3746 | * clean and active | |
3747 | */ | |
3748 | spin_lock(&mddev->lock); | |
3749 | if (st == active) { | |
3750 | restart_array(mddev); | |
3751 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3752 | wake_up(&mddev->sb_wait); | |
3753 | err = 0; | |
3754 | } else /* st == clean */ { | |
3755 | restart_array(mddev); | |
3756 | if (atomic_read(&mddev->writes_pending) == 0) { | |
3757 | if (mddev->in_sync == 0) { | |
3758 | mddev->in_sync = 1; | |
3759 | if (mddev->safemode == 1) | |
3760 | mddev->safemode = 0; | |
3761 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3762 | } | |
3763 | err = 0; | |
3764 | } else | |
3765 | err = -EBUSY; | |
3766 | } | |
3767 | spin_unlock(&mddev->lock); | |
3768 | return err; | |
3769 | } | |
3770 | err = mddev_lock(mddev); | |
3771 | if (err) | |
3772 | return err; | |
3773 | err = -EINVAL; | |
9e653b63 N |
3774 | switch(st) { |
3775 | case bad_word: | |
3776 | break; | |
3777 | case clear: | |
3778 | /* stopping an active array */ | |
a05b7ea0 | 3779 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3780 | break; |
3781 | case inactive: | |
3782 | /* stopping an active array */ | |
90cf195d | 3783 | if (mddev->pers) |
a05b7ea0 | 3784 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3785 | else |
e691063a | 3786 | err = 0; /* already inactive */ |
9e653b63 N |
3787 | break; |
3788 | case suspended: | |
3789 | break; /* not supported yet */ | |
3790 | case readonly: | |
3791 | if (mddev->pers) | |
a05b7ea0 | 3792 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3793 | else { |
3794 | mddev->ro = 1; | |
648b629e | 3795 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3796 | err = do_md_run(mddev); |
3797 | } | |
3798 | break; | |
3799 | case read_auto: | |
9e653b63 | 3800 | if (mddev->pers) { |
80268ee9 | 3801 | if (mddev->ro == 0) |
a05b7ea0 | 3802 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3803 | else if (mddev->ro == 1) |
648b629e N |
3804 | err = restart_array(mddev); |
3805 | if (err == 0) { | |
3806 | mddev->ro = 2; | |
3807 | set_disk_ro(mddev->gendisk, 0); | |
3808 | } | |
9e653b63 N |
3809 | } else { |
3810 | mddev->ro = 2; | |
3811 | err = do_md_run(mddev); | |
3812 | } | |
3813 | break; | |
3814 | case clean: | |
3815 | if (mddev->pers) { | |
3816 | restart_array(mddev); | |
85572d7c | 3817 | spin_lock(&mddev->lock); |
9e653b63 | 3818 | if (atomic_read(&mddev->writes_pending) == 0) { |
e691063a N |
3819 | if (mddev->in_sync == 0) { |
3820 | mddev->in_sync = 1; | |
31a59e34 N |
3821 | if (mddev->safemode == 1) |
3822 | mddev->safemode = 0; | |
070dc6dd | 3823 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3824 | } |
3825 | err = 0; | |
3826 | } else | |
3827 | err = -EBUSY; | |
85572d7c | 3828 | spin_unlock(&mddev->lock); |
5bf29597 N |
3829 | } else |
3830 | err = -EINVAL; | |
9e653b63 N |
3831 | break; |
3832 | case active: | |
3833 | if (mddev->pers) { | |
3834 | restart_array(mddev); | |
070dc6dd | 3835 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3836 | wake_up(&mddev->sb_wait); |
3837 | err = 0; | |
3838 | } else { | |
3839 | mddev->ro = 0; | |
648b629e | 3840 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3841 | err = do_md_run(mddev); |
3842 | } | |
3843 | break; | |
3844 | case write_pending: | |
3845 | case active_idle: | |
3846 | /* these cannot be set */ | |
3847 | break; | |
3848 | } | |
6791875e N |
3849 | |
3850 | if (!err) { | |
1d23f178 N |
3851 | if (mddev->hold_active == UNTIL_IOCTL) |
3852 | mddev->hold_active = 0; | |
00bcb4ac | 3853 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 3854 | } |
6791875e N |
3855 | mddev_unlock(mddev); |
3856 | return err ?: len; | |
9e653b63 | 3857 | } |
80ca3a44 N |
3858 | static struct md_sysfs_entry md_array_state = |
3859 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3860 | |
1e50915f | 3861 | static ssize_t |
fd01b88c | 3862 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3863 | return sprintf(page, "%d\n", |
3864 | atomic_read(&mddev->max_corr_read_errors)); | |
3865 | } | |
3866 | ||
3867 | static ssize_t | |
fd01b88c | 3868 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f RB |
3869 | { |
3870 | char *e; | |
3871 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3872 | ||
3873 | if (*buf && (*e == 0 || *e == '\n')) { | |
3874 | atomic_set(&mddev->max_corr_read_errors, n); | |
3875 | return len; | |
3876 | } | |
3877 | return -EINVAL; | |
3878 | } | |
3879 | ||
3880 | static struct md_sysfs_entry max_corr_read_errors = | |
3881 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3882 | max_corrected_read_errors_store); | |
3883 | ||
6d7ff738 | 3884 | static ssize_t |
fd01b88c | 3885 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3886 | { |
3887 | return -EINVAL; | |
3888 | } | |
3889 | ||
3890 | static ssize_t | |
fd01b88c | 3891 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
3892 | { |
3893 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3894 | /* The new device is added to the array. | |
3895 | * If the array has a persistent superblock, we read the | |
3896 | * superblock to initialise info and check validity. | |
3897 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3898 | * which mainly checks size. | |
3899 | */ | |
3900 | char *e; | |
3901 | int major = simple_strtoul(buf, &e, 10); | |
3902 | int minor; | |
3903 | dev_t dev; | |
3cb03002 | 3904 | struct md_rdev *rdev; |
6d7ff738 N |
3905 | int err; |
3906 | ||
3907 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3908 | return -EINVAL; | |
3909 | minor = simple_strtoul(e+1, &e, 10); | |
3910 | if (*e && *e != '\n') | |
3911 | return -EINVAL; | |
3912 | dev = MKDEV(major, minor); | |
3913 | if (major != MAJOR(dev) || | |
3914 | minor != MINOR(dev)) | |
3915 | return -EOVERFLOW; | |
3916 | ||
6791875e N |
3917 | flush_workqueue(md_misc_wq); |
3918 | ||
3919 | err = mddev_lock(mddev); | |
3920 | if (err) | |
3921 | return err; | |
6d7ff738 N |
3922 | if (mddev->persistent) { |
3923 | rdev = md_import_device(dev, mddev->major_version, | |
3924 | mddev->minor_version); | |
3925 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
3926 | struct md_rdev *rdev0 |
3927 | = list_entry(mddev->disks.next, | |
3928 | struct md_rdev, same_set); | |
6d7ff738 N |
3929 | err = super_types[mddev->major_version] |
3930 | .load_super(rdev, rdev0, mddev->minor_version); | |
3931 | if (err < 0) | |
3932 | goto out; | |
3933 | } | |
c5d79adb N |
3934 | } else if (mddev->external) |
3935 | rdev = md_import_device(dev, -2, -1); | |
3936 | else | |
6d7ff738 N |
3937 | rdev = md_import_device(dev, -1, -1); |
3938 | ||
3939 | if (IS_ERR(rdev)) | |
3940 | return PTR_ERR(rdev); | |
3941 | err = bind_rdev_to_array(rdev, mddev); | |
3942 | out: | |
3943 | if (err) | |
3944 | export_rdev(rdev); | |
6791875e | 3945 | mddev_unlock(mddev); |
6d7ff738 N |
3946 | return err ? err : len; |
3947 | } | |
3948 | ||
3949 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3950 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3951 | |
9b1d1dac | 3952 | static ssize_t |
fd01b88c | 3953 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
3954 | { |
3955 | char *end; | |
3956 | unsigned long chunk, end_chunk; | |
6791875e | 3957 | int err; |
9b1d1dac | 3958 | |
6791875e N |
3959 | err = mddev_lock(mddev); |
3960 | if (err) | |
3961 | return err; | |
9b1d1dac PC |
3962 | if (!mddev->bitmap) |
3963 | goto out; | |
3964 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3965 | while (*buf) { | |
3966 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3967 | if (buf == end) break; | |
3968 | if (*end == '-') { /* range */ | |
3969 | buf = end + 1; | |
3970 | end_chunk = simple_strtoul(buf, &end, 0); | |
3971 | if (buf == end) break; | |
3972 | } | |
3973 | if (*end && !isspace(*end)) break; | |
3974 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3975 | buf = skip_spaces(end); |
9b1d1dac PC |
3976 | } |
3977 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3978 | out: | |
6791875e | 3979 | mddev_unlock(mddev); |
9b1d1dac PC |
3980 | return len; |
3981 | } | |
3982 | ||
3983 | static struct md_sysfs_entry md_bitmap = | |
3984 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3985 | ||
a35b0d69 | 3986 | static ssize_t |
fd01b88c | 3987 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 3988 | { |
58c0fed4 AN |
3989 | return sprintf(page, "%llu\n", |
3990 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3991 | } |
3992 | ||
fd01b88c | 3993 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
3994 | |
3995 | static ssize_t | |
fd01b88c | 3996 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
3997 | { |
3998 | /* If array is inactive, we can reduce the component size, but | |
3999 | * not increase it (except from 0). | |
4000 | * If array is active, we can try an on-line resize | |
4001 | */ | |
b522adcd DW |
4002 | sector_t sectors; |
4003 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 4004 | |
58c0fed4 AN |
4005 | if (err < 0) |
4006 | return err; | |
6791875e N |
4007 | err = mddev_lock(mddev); |
4008 | if (err) | |
4009 | return err; | |
a35b0d69 | 4010 | if (mddev->pers) { |
58c0fed4 | 4011 | err = update_size(mddev, sectors); |
850b2b42 | 4012 | md_update_sb(mddev, 1); |
a35b0d69 | 4013 | } else { |
58c0fed4 AN |
4014 | if (mddev->dev_sectors == 0 || |
4015 | mddev->dev_sectors > sectors) | |
4016 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
4017 | else |
4018 | err = -ENOSPC; | |
4019 | } | |
6791875e | 4020 | mddev_unlock(mddev); |
a35b0d69 N |
4021 | return err ? err : len; |
4022 | } | |
4023 | ||
4024 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 4025 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 4026 | |
83f0d77a | 4027 | /* Metadata version. |
e691063a N |
4028 | * This is one of |
4029 | * 'none' for arrays with no metadata (good luck...) | |
4030 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
4031 | * or N.M for internally known formats |
4032 | */ | |
4033 | static ssize_t | |
fd01b88c | 4034 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
4035 | { |
4036 | if (mddev->persistent) | |
4037 | return sprintf(page, "%d.%d\n", | |
4038 | mddev->major_version, mddev->minor_version); | |
e691063a N |
4039 | else if (mddev->external) |
4040 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
4041 | else |
4042 | return sprintf(page, "none\n"); | |
4043 | } | |
4044 | ||
4045 | static ssize_t | |
fd01b88c | 4046 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
4047 | { |
4048 | int major, minor; | |
4049 | char *e; | |
6791875e | 4050 | int err; |
ea43ddd8 N |
4051 | /* Changing the details of 'external' metadata is |
4052 | * always permitted. Otherwise there must be | |
4053 | * no devices attached to the array. | |
4054 | */ | |
6791875e N |
4055 | |
4056 | err = mddev_lock(mddev); | |
4057 | if (err) | |
4058 | return err; | |
4059 | err = -EBUSY; | |
ea43ddd8 N |
4060 | if (mddev->external && strncmp(buf, "external:", 9) == 0) |
4061 | ; | |
4062 | else if (!list_empty(&mddev->disks)) | |
6791875e | 4063 | goto out_unlock; |
8bb93aac | 4064 | |
6791875e | 4065 | err = 0; |
8bb93aac N |
4066 | if (cmd_match(buf, "none")) { |
4067 | mddev->persistent = 0; | |
e691063a N |
4068 | mddev->external = 0; |
4069 | mddev->major_version = 0; | |
4070 | mddev->minor_version = 90; | |
6791875e | 4071 | goto out_unlock; |
e691063a N |
4072 | } |
4073 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4074 | size_t namelen = len-9; |
e691063a N |
4075 | if (namelen >= sizeof(mddev->metadata_type)) |
4076 | namelen = sizeof(mddev->metadata_type)-1; | |
4077 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4078 | mddev->metadata_type[namelen] = 0; | |
4079 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4080 | mddev->metadata_type[--namelen] = 0; | |
4081 | mddev->persistent = 0; | |
4082 | mddev->external = 1; | |
8bb93aac N |
4083 | mddev->major_version = 0; |
4084 | mddev->minor_version = 90; | |
6791875e | 4085 | goto out_unlock; |
8bb93aac N |
4086 | } |
4087 | major = simple_strtoul(buf, &e, 10); | |
6791875e | 4088 | err = -EINVAL; |
8bb93aac | 4089 | if (e==buf || *e != '.') |
6791875e | 4090 | goto out_unlock; |
8bb93aac N |
4091 | buf = e+1; |
4092 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4093 | if (e==buf || (*e && *e != '\n') ) |
6791875e N |
4094 | goto out_unlock; |
4095 | err = -ENOENT; | |
50511da3 | 4096 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
6791875e | 4097 | goto out_unlock; |
8bb93aac N |
4098 | mddev->major_version = major; |
4099 | mddev->minor_version = minor; | |
4100 | mddev->persistent = 1; | |
e691063a | 4101 | mddev->external = 0; |
6791875e N |
4102 | err = 0; |
4103 | out_unlock: | |
4104 | mddev_unlock(mddev); | |
4105 | return err ?: len; | |
8bb93aac N |
4106 | } |
4107 | ||
4108 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 4109 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4110 | |
24dd469d | 4111 | static ssize_t |
fd01b88c | 4112 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4113 | { |
7eec314d | 4114 | char *type = "idle"; |
b7b17c9b N |
4115 | unsigned long recovery = mddev->recovery; |
4116 | if (test_bit(MD_RECOVERY_FROZEN, &recovery)) | |
b6a9ce68 | 4117 | type = "frozen"; |
b7b17c9b N |
4118 | else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || |
4119 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { | |
4120 | if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) | |
ccfcc3c1 | 4121 | type = "reshape"; |
b7b17c9b N |
4122 | else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { |
4123 | if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) | |
24dd469d | 4124 | type = "resync"; |
b7b17c9b | 4125 | else if (test_bit(MD_RECOVERY_CHECK, &recovery)) |
24dd469d N |
4126 | type = "check"; |
4127 | else | |
4128 | type = "repair"; | |
b7b17c9b | 4129 | } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) |
24dd469d N |
4130 | type = "recover"; |
4131 | } | |
4132 | return sprintf(page, "%s\n", type); | |
4133 | } | |
4134 | ||
4135 | static ssize_t | |
fd01b88c | 4136 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4137 | { |
7eec314d N |
4138 | if (!mddev->pers || !mddev->pers->sync_request) |
4139 | return -EINVAL; | |
4140 | ||
b6a9ce68 N |
4141 | if (cmd_match(page, "frozen")) |
4142 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4143 | else | |
4144 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4145 | ||
4146 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
f851b60d | 4147 | flush_workqueue(md_misc_wq); |
7eec314d N |
4148 | if (mddev->sync_thread) { |
4149 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6791875e N |
4150 | if (mddev_lock(mddev) == 0) { |
4151 | md_reap_sync_thread(mddev); | |
4152 | mddev_unlock(mddev); | |
4153 | } | |
7eec314d | 4154 | } |
03c902e1 N |
4155 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4156 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4157 | return -EBUSY; |
72a23c21 NB |
4158 | else if (cmd_match(page, "resync")) |
4159 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4160 | else if (cmd_match(page, "recover")) { | |
4161 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4162 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4163 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4164 | int err; |
4165 | if (mddev->pers->start_reshape == NULL) | |
4166 | return -EINVAL; | |
6791875e N |
4167 | err = mddev_lock(mddev); |
4168 | if (!err) { | |
4169 | err = mddev->pers->start_reshape(mddev); | |
4170 | mddev_unlock(mddev); | |
4171 | } | |
16484bf5 N |
4172 | if (err) |
4173 | return err; | |
a99ac971 | 4174 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4175 | } else { |
bce74dac | 4176 | if (cmd_match(page, "check")) |
7eec314d | 4177 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4178 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4179 | return -EINVAL; |
4180 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4181 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4182 | } |
48c26ddc N |
4183 | if (mddev->ro == 2) { |
4184 | /* A write to sync_action is enough to justify | |
4185 | * canceling read-auto mode | |
4186 | */ | |
4187 | mddev->ro = 0; | |
4188 | md_wakeup_thread(mddev->sync_thread); | |
4189 | } | |
03c902e1 | 4190 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4191 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4192 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4193 | return len; |
4194 | } | |
4195 | ||
c4a39551 JB |
4196 | static struct md_sysfs_entry md_scan_mode = |
4197 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
4198 | ||
4199 | static ssize_t | |
4200 | last_sync_action_show(struct mddev *mddev, char *page) | |
4201 | { | |
4202 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4203 | } | |
4204 | ||
4205 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4206 | ||
9d88883e | 4207 | static ssize_t |
fd01b88c | 4208 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4209 | { |
4210 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4211 | (unsigned long long) |
4212 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4213 | } |
4214 | ||
80ca3a44 | 4215 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4216 | |
88202a0c | 4217 | static ssize_t |
fd01b88c | 4218 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4219 | { |
4220 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4221 | mddev->sync_speed_min ? "local": "system"); | |
4222 | } | |
4223 | ||
4224 | static ssize_t | |
fd01b88c | 4225 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4226 | { |
4227 | int min; | |
4228 | char *e; | |
4229 | if (strncmp(buf, "system", 6)==0) { | |
4230 | mddev->sync_speed_min = 0; | |
4231 | return len; | |
4232 | } | |
4233 | min = simple_strtoul(buf, &e, 10); | |
4234 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4235 | return -EINVAL; | |
4236 | mddev->sync_speed_min = min; | |
4237 | return len; | |
4238 | } | |
4239 | ||
4240 | static struct md_sysfs_entry md_sync_min = | |
4241 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4242 | ||
4243 | static ssize_t | |
fd01b88c | 4244 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4245 | { |
4246 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4247 | mddev->sync_speed_max ? "local": "system"); | |
4248 | } | |
4249 | ||
4250 | static ssize_t | |
fd01b88c | 4251 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4252 | { |
4253 | int max; | |
4254 | char *e; | |
4255 | if (strncmp(buf, "system", 6)==0) { | |
4256 | mddev->sync_speed_max = 0; | |
4257 | return len; | |
4258 | } | |
4259 | max = simple_strtoul(buf, &e, 10); | |
4260 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4261 | return -EINVAL; | |
4262 | mddev->sync_speed_max = max; | |
4263 | return len; | |
4264 | } | |
4265 | ||
4266 | static struct md_sysfs_entry md_sync_max = | |
4267 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4268 | ||
d7f3d291 | 4269 | static ssize_t |
fd01b88c | 4270 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4271 | { |
4272 | return sprintf(page, "%d\n", mddev->degraded); | |
4273 | } | |
4274 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4275 | |
90b08710 | 4276 | static ssize_t |
fd01b88c | 4277 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4278 | { |
4279 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4280 | } | |
4281 | ||
4282 | static ssize_t | |
fd01b88c | 4283 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4284 | { |
4285 | long n; | |
4286 | ||
b29bebd6 | 4287 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4288 | return -EINVAL; |
4289 | ||
4290 | if (n != 0 && n != 1) | |
4291 | return -EINVAL; | |
4292 | ||
4293 | mddev->parallel_resync = n; | |
4294 | ||
4295 | if (mddev->sync_thread) | |
4296 | wake_up(&resync_wait); | |
4297 | ||
4298 | return len; | |
4299 | } | |
4300 | ||
4301 | /* force parallel resync, even with shared block devices */ | |
4302 | static struct md_sysfs_entry md_sync_force_parallel = | |
4303 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4304 | sync_force_parallel_show, sync_force_parallel_store); | |
4305 | ||
88202a0c | 4306 | static ssize_t |
fd01b88c | 4307 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4308 | { |
4309 | unsigned long resync, dt, db; | |
d1a7c503 N |
4310 | if (mddev->curr_resync == 0) |
4311 | return sprintf(page, "none\n"); | |
9687a60c AN |
4312 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4313 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4314 | if (!dt) dt++; |
9687a60c AN |
4315 | db = resync - mddev->resync_mark_cnt; |
4316 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4317 | } |
4318 | ||
80ca3a44 | 4319 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4320 | |
4321 | static ssize_t | |
fd01b88c | 4322 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4323 | { |
13ae864b | 4324 | unsigned long long max_sectors, resync; |
88202a0c | 4325 | |
acb180b0 N |
4326 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4327 | return sprintf(page, "none\n"); | |
4328 | ||
72f36d59 N |
4329 | if (mddev->curr_resync == 1 || |
4330 | mddev->curr_resync == 2) | |
4331 | return sprintf(page, "delayed\n"); | |
4332 | ||
c804cdec N |
4333 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4334 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4335 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4336 | else |
58c0fed4 | 4337 | max_sectors = mddev->dev_sectors; |
88202a0c | 4338 | |
acb180b0 | 4339 | resync = mddev->curr_resync_completed; |
13ae864b | 4340 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4341 | } |
4342 | ||
80ca3a44 | 4343 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4344 | |
5e96ee65 | 4345 | static ssize_t |
fd01b88c | 4346 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4347 | { |
4348 | return sprintf(page, "%llu\n", | |
4349 | (unsigned long long)mddev->resync_min); | |
4350 | } | |
4351 | static ssize_t | |
fd01b88c | 4352 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4353 | { |
4354 | unsigned long long min; | |
23da422b N |
4355 | int err; |
4356 | int chunk; | |
4357 | ||
b29bebd6 | 4358 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 | 4359 | return -EINVAL; |
23da422b N |
4360 | |
4361 | spin_lock(&mddev->lock); | |
4362 | err = -EINVAL; | |
5e96ee65 | 4363 | if (min > mddev->resync_max) |
23da422b N |
4364 | goto out_unlock; |
4365 | ||
4366 | err = -EBUSY; | |
5e96ee65 | 4367 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4368 | goto out_unlock; |
5e96ee65 NB |
4369 | |
4370 | /* Must be a multiple of chunk_size */ | |
23da422b N |
4371 | chunk = mddev->chunk_sectors; |
4372 | if (chunk) { | |
2ac06c33 | 4373 | sector_t temp = min; |
23da422b N |
4374 | |
4375 | err = -EINVAL; | |
4376 | if (sector_div(temp, chunk)) | |
4377 | goto out_unlock; | |
5e96ee65 NB |
4378 | } |
4379 | mddev->resync_min = min; | |
23da422b | 4380 | err = 0; |
5e96ee65 | 4381 | |
23da422b N |
4382 | out_unlock: |
4383 | spin_unlock(&mddev->lock); | |
4384 | return err ?: len; | |
5e96ee65 NB |
4385 | } |
4386 | ||
4387 | static struct md_sysfs_entry md_min_sync = | |
4388 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4389 | ||
c6207277 | 4390 | static ssize_t |
fd01b88c | 4391 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4392 | { |
4393 | if (mddev->resync_max == MaxSector) | |
4394 | return sprintf(page, "max\n"); | |
4395 | else | |
4396 | return sprintf(page, "%llu\n", | |
4397 | (unsigned long long)mddev->resync_max); | |
4398 | } | |
4399 | static ssize_t | |
fd01b88c | 4400 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 | 4401 | { |
23da422b N |
4402 | int err; |
4403 | spin_lock(&mddev->lock); | |
c6207277 N |
4404 | if (strncmp(buf, "max", 3) == 0) |
4405 | mddev->resync_max = MaxSector; | |
4406 | else { | |
5e96ee65 | 4407 | unsigned long long max; |
23da422b N |
4408 | int chunk; |
4409 | ||
4410 | err = -EINVAL; | |
b29bebd6 | 4411 | if (kstrtoull(buf, 10, &max)) |
23da422b | 4412 | goto out_unlock; |
5e96ee65 | 4413 | if (max < mddev->resync_min) |
23da422b N |
4414 | goto out_unlock; |
4415 | ||
4416 | err = -EBUSY; | |
c6207277 | 4417 | if (max < mddev->resync_max && |
4d484a4a | 4418 | mddev->ro == 0 && |
c6207277 | 4419 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4420 | goto out_unlock; |
c6207277 N |
4421 | |
4422 | /* Must be a multiple of chunk_size */ | |
23da422b N |
4423 | chunk = mddev->chunk_sectors; |
4424 | if (chunk) { | |
2ac06c33 | 4425 | sector_t temp = max; |
23da422b N |
4426 | |
4427 | err = -EINVAL; | |
4428 | if (sector_div(temp, chunk)) | |
4429 | goto out_unlock; | |
c6207277 N |
4430 | } |
4431 | mddev->resync_max = max; | |
4432 | } | |
4433 | wake_up(&mddev->recovery_wait); | |
23da422b N |
4434 | err = 0; |
4435 | out_unlock: | |
4436 | spin_unlock(&mddev->lock); | |
4437 | return err ?: len; | |
c6207277 N |
4438 | } |
4439 | ||
4440 | static struct md_sysfs_entry md_max_sync = | |
4441 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4442 | ||
e464eafd | 4443 | static ssize_t |
fd01b88c | 4444 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4445 | { |
4446 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4447 | } | |
4448 | ||
4449 | static ssize_t | |
fd01b88c | 4450 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4451 | { |
4452 | char *e; | |
4453 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
6791875e N |
4454 | unsigned long long old; |
4455 | int err; | |
e464eafd | 4456 | |
e464eafd N |
4457 | if (buf == e || (*e && *e != '\n')) |
4458 | return -EINVAL; | |
23ddff37 | 4459 | |
6791875e N |
4460 | err = mddev_lock(mddev); |
4461 | if (err) | |
4462 | return err; | |
4463 | err = -EINVAL; | |
4464 | if (mddev->pers == NULL || | |
4465 | mddev->pers->quiesce == NULL) | |
4466 | goto unlock; | |
4467 | old = mddev->suspend_lo; | |
23ddff37 N |
4468 | mddev->suspend_lo = new; |
4469 | if (new >= old) | |
4470 | /* Shrinking suspended region */ | |
e464eafd | 4471 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4472 | else { |
4473 | /* Expanding suspended region - need to wait */ | |
4474 | mddev->pers->quiesce(mddev, 1); | |
4475 | mddev->pers->quiesce(mddev, 0); | |
4476 | } | |
6791875e N |
4477 | err = 0; |
4478 | unlock: | |
4479 | mddev_unlock(mddev); | |
4480 | return err ?: len; | |
e464eafd N |
4481 | } |
4482 | static struct md_sysfs_entry md_suspend_lo = | |
4483 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4484 | ||
e464eafd | 4485 | static ssize_t |
fd01b88c | 4486 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4487 | { |
4488 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4489 | } | |
4490 | ||
4491 | static ssize_t | |
fd01b88c | 4492 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4493 | { |
4494 | char *e; | |
4495 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
6791875e N |
4496 | unsigned long long old; |
4497 | int err; | |
e464eafd | 4498 | |
e464eafd N |
4499 | if (buf == e || (*e && *e != '\n')) |
4500 | return -EINVAL; | |
23ddff37 | 4501 | |
6791875e N |
4502 | err = mddev_lock(mddev); |
4503 | if (err) | |
4504 | return err; | |
4505 | err = -EINVAL; | |
4506 | if (mddev->pers == NULL || | |
4507 | mddev->pers->quiesce == NULL) | |
4508 | goto unlock; | |
4509 | old = mddev->suspend_hi; | |
23ddff37 N |
4510 | mddev->suspend_hi = new; |
4511 | if (new <= old) | |
4512 | /* Shrinking suspended region */ | |
4513 | mddev->pers->quiesce(mddev, 2); | |
4514 | else { | |
4515 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4516 | mddev->pers->quiesce(mddev, 1); |
4517 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 | 4518 | } |
6791875e N |
4519 | err = 0; |
4520 | unlock: | |
4521 | mddev_unlock(mddev); | |
4522 | return err ?: len; | |
e464eafd N |
4523 | } |
4524 | static struct md_sysfs_entry md_suspend_hi = | |
4525 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4526 | ||
08a02ecd | 4527 | static ssize_t |
fd01b88c | 4528 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4529 | { |
4530 | if (mddev->reshape_position != MaxSector) | |
4531 | return sprintf(page, "%llu\n", | |
4532 | (unsigned long long)mddev->reshape_position); | |
4533 | strcpy(page, "none\n"); | |
4534 | return 5; | |
4535 | } | |
4536 | ||
4537 | static ssize_t | |
fd01b88c | 4538 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4539 | { |
c6563a8c | 4540 | struct md_rdev *rdev; |
08a02ecd | 4541 | char *e; |
6791875e | 4542 | int err; |
08a02ecd | 4543 | unsigned long long new = simple_strtoull(buf, &e, 10); |
6791875e | 4544 | |
08a02ecd N |
4545 | if (buf == e || (*e && *e != '\n')) |
4546 | return -EINVAL; | |
6791875e N |
4547 | err = mddev_lock(mddev); |
4548 | if (err) | |
4549 | return err; | |
4550 | err = -EBUSY; | |
4551 | if (mddev->pers) | |
4552 | goto unlock; | |
08a02ecd N |
4553 | mddev->reshape_position = new; |
4554 | mddev->delta_disks = 0; | |
2c810cdd | 4555 | mddev->reshape_backwards = 0; |
08a02ecd N |
4556 | mddev->new_level = mddev->level; |
4557 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4558 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4559 | rdev_for_each(rdev, mddev) |
4560 | rdev->new_data_offset = rdev->data_offset; | |
6791875e N |
4561 | err = 0; |
4562 | unlock: | |
4563 | mddev_unlock(mddev); | |
4564 | return err ?: len; | |
08a02ecd N |
4565 | } |
4566 | ||
4567 | static struct md_sysfs_entry md_reshape_position = | |
4568 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4569 | reshape_position_store); | |
4570 | ||
2c810cdd N |
4571 | static ssize_t |
4572 | reshape_direction_show(struct mddev *mddev, char *page) | |
4573 | { | |
4574 | return sprintf(page, "%s\n", | |
4575 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4576 | } | |
4577 | ||
4578 | static ssize_t | |
4579 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4580 | { | |
4581 | int backwards = 0; | |
6791875e N |
4582 | int err; |
4583 | ||
2c810cdd N |
4584 | if (cmd_match(buf, "forwards")) |
4585 | backwards = 0; | |
4586 | else if (cmd_match(buf, "backwards")) | |
4587 | backwards = 1; | |
4588 | else | |
4589 | return -EINVAL; | |
4590 | if (mddev->reshape_backwards == backwards) | |
4591 | return len; | |
4592 | ||
6791875e N |
4593 | err = mddev_lock(mddev); |
4594 | if (err) | |
4595 | return err; | |
2c810cdd N |
4596 | /* check if we are allowed to change */ |
4597 | if (mddev->delta_disks) | |
6791875e N |
4598 | err = -EBUSY; |
4599 | else if (mddev->persistent && | |
2c810cdd | 4600 | mddev->major_version == 0) |
6791875e N |
4601 | err = -EINVAL; |
4602 | else | |
4603 | mddev->reshape_backwards = backwards; | |
4604 | mddev_unlock(mddev); | |
4605 | return err ?: len; | |
2c810cdd N |
4606 | } |
4607 | ||
4608 | static struct md_sysfs_entry md_reshape_direction = | |
4609 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4610 | reshape_direction_store); | |
4611 | ||
b522adcd | 4612 | static ssize_t |
fd01b88c | 4613 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4614 | { |
4615 | if (mddev->external_size) | |
4616 | return sprintf(page, "%llu\n", | |
4617 | (unsigned long long)mddev->array_sectors/2); | |
4618 | else | |
4619 | return sprintf(page, "default\n"); | |
4620 | } | |
4621 | ||
4622 | static ssize_t | |
fd01b88c | 4623 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4624 | { |
4625 | sector_t sectors; | |
6791875e N |
4626 | int err; |
4627 | ||
4628 | err = mddev_lock(mddev); | |
4629 | if (err) | |
4630 | return err; | |
b522adcd DW |
4631 | |
4632 | if (strncmp(buf, "default", 7) == 0) { | |
4633 | if (mddev->pers) | |
4634 | sectors = mddev->pers->size(mddev, 0, 0); | |
4635 | else | |
4636 | sectors = mddev->array_sectors; | |
4637 | ||
4638 | mddev->external_size = 0; | |
4639 | } else { | |
4640 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
6791875e N |
4641 | err = -EINVAL; |
4642 | else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
4643 | err = -E2BIG; | |
4644 | else | |
4645 | mddev->external_size = 1; | |
b522adcd DW |
4646 | } |
4647 | ||
6791875e N |
4648 | if (!err) { |
4649 | mddev->array_sectors = sectors; | |
4650 | if (mddev->pers) { | |
4651 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
4652 | revalidate_disk(mddev->gendisk); | |
4653 | } | |
cbe6ef1d | 4654 | } |
6791875e N |
4655 | mddev_unlock(mddev); |
4656 | return err ?: len; | |
b522adcd DW |
4657 | } |
4658 | ||
4659 | static struct md_sysfs_entry md_array_size = | |
4660 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4661 | array_size_store); | |
e464eafd | 4662 | |
eae1701f N |
4663 | static struct attribute *md_default_attrs[] = { |
4664 | &md_level.attr, | |
d4dbd025 | 4665 | &md_layout.attr, |
eae1701f | 4666 | &md_raid_disks.attr, |
3b34380a | 4667 | &md_chunk_size.attr, |
a35b0d69 | 4668 | &md_size.attr, |
a94213b1 | 4669 | &md_resync_start.attr, |
8bb93aac | 4670 | &md_metadata.attr, |
6d7ff738 | 4671 | &md_new_device.attr, |
16f17b39 | 4672 | &md_safe_delay.attr, |
9e653b63 | 4673 | &md_array_state.attr, |
08a02ecd | 4674 | &md_reshape_position.attr, |
2c810cdd | 4675 | &md_reshape_direction.attr, |
b522adcd | 4676 | &md_array_size.attr, |
1e50915f | 4677 | &max_corr_read_errors.attr, |
411036fa N |
4678 | NULL, |
4679 | }; | |
4680 | ||
4681 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4682 | &md_scan_mode.attr, |
c4a39551 | 4683 | &md_last_scan_mode.attr, |
9d88883e | 4684 | &md_mismatches.attr, |
88202a0c N |
4685 | &md_sync_min.attr, |
4686 | &md_sync_max.attr, | |
4687 | &md_sync_speed.attr, | |
90b08710 | 4688 | &md_sync_force_parallel.attr, |
88202a0c | 4689 | &md_sync_completed.attr, |
5e96ee65 | 4690 | &md_min_sync.attr, |
c6207277 | 4691 | &md_max_sync.attr, |
e464eafd N |
4692 | &md_suspend_lo.attr, |
4693 | &md_suspend_hi.attr, | |
9b1d1dac | 4694 | &md_bitmap.attr, |
d7f3d291 | 4695 | &md_degraded.attr, |
eae1701f N |
4696 | NULL, |
4697 | }; | |
411036fa N |
4698 | static struct attribute_group md_redundancy_group = { |
4699 | .name = NULL, | |
4700 | .attrs = md_redundancy_attrs, | |
4701 | }; | |
4702 | ||
eae1701f N |
4703 | static ssize_t |
4704 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4705 | { | |
4706 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4707 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4708 | ssize_t rv; |
eae1701f N |
4709 | |
4710 | if (!entry->show) | |
4711 | return -EIO; | |
af8a2434 N |
4712 | spin_lock(&all_mddevs_lock); |
4713 | if (list_empty(&mddev->all_mddevs)) { | |
4714 | spin_unlock(&all_mddevs_lock); | |
4715 | return -EBUSY; | |
4716 | } | |
4717 | mddev_get(mddev); | |
4718 | spin_unlock(&all_mddevs_lock); | |
4719 | ||
b7b17c9b | 4720 | rv = entry->show(mddev, page); |
af8a2434 | 4721 | mddev_put(mddev); |
96de1e66 | 4722 | return rv; |
eae1701f N |
4723 | } |
4724 | ||
4725 | static ssize_t | |
4726 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4727 | const char *page, size_t length) | |
4728 | { | |
4729 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4730 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4731 | ssize_t rv; |
eae1701f N |
4732 | |
4733 | if (!entry->store) | |
4734 | return -EIO; | |
67463acb N |
4735 | if (!capable(CAP_SYS_ADMIN)) |
4736 | return -EACCES; | |
af8a2434 N |
4737 | spin_lock(&all_mddevs_lock); |
4738 | if (list_empty(&mddev->all_mddevs)) { | |
4739 | spin_unlock(&all_mddevs_lock); | |
4740 | return -EBUSY; | |
4741 | } | |
4742 | mddev_get(mddev); | |
4743 | spin_unlock(&all_mddevs_lock); | |
6791875e | 4744 | rv = entry->store(mddev, page, length); |
af8a2434 | 4745 | mddev_put(mddev); |
96de1e66 | 4746 | return rv; |
eae1701f N |
4747 | } |
4748 | ||
4749 | static void md_free(struct kobject *ko) | |
4750 | { | |
fd01b88c | 4751 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4752 | |
4753 | if (mddev->sysfs_state) | |
4754 | sysfs_put(mddev->sysfs_state); | |
4755 | ||
4756 | if (mddev->gendisk) { | |
4757 | del_gendisk(mddev->gendisk); | |
4758 | put_disk(mddev->gendisk); | |
4759 | } | |
4760 | if (mddev->queue) | |
4761 | blk_cleanup_queue(mddev->queue); | |
4762 | ||
eae1701f N |
4763 | kfree(mddev); |
4764 | } | |
4765 | ||
52cf25d0 | 4766 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4767 | .show = md_attr_show, |
4768 | .store = md_attr_store, | |
4769 | }; | |
4770 | static struct kobj_type md_ktype = { | |
4771 | .release = md_free, | |
4772 | .sysfs_ops = &md_sysfs_ops, | |
4773 | .default_attrs = md_default_attrs, | |
4774 | }; | |
4775 | ||
1da177e4 LT |
4776 | int mdp_major = 0; |
4777 | ||
5fd3a17e DW |
4778 | static void mddev_delayed_delete(struct work_struct *ws) |
4779 | { | |
fd01b88c | 4780 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4781 | |
43a70507 | 4782 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4783 | kobject_del(&mddev->kobj); |
4784 | kobject_put(&mddev->kobj); | |
4785 | } | |
4786 | ||
efeb53c0 | 4787 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4788 | { |
48c9c27b | 4789 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4790 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4791 | struct gendisk *disk; |
efeb53c0 N |
4792 | int partitioned; |
4793 | int shift; | |
4794 | int unit; | |
3830c62f | 4795 | int error; |
1da177e4 LT |
4796 | |
4797 | if (!mddev) | |
efeb53c0 N |
4798 | return -ENODEV; |
4799 | ||
4800 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4801 | shift = partitioned ? MdpMinorShift : 0; | |
4802 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4803 | |
e804ac78 TH |
4804 | /* wait for any previous instance of this device to be |
4805 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4806 | */ |
e804ac78 | 4807 | flush_workqueue(md_misc_wq); |
d3374825 | 4808 | |
48c9c27b | 4809 | mutex_lock(&disks_mutex); |
0909dc44 N |
4810 | error = -EEXIST; |
4811 | if (mddev->gendisk) | |
4812 | goto abort; | |
efeb53c0 N |
4813 | |
4814 | if (name) { | |
4815 | /* Need to ensure that 'name' is not a duplicate. | |
4816 | */ | |
fd01b88c | 4817 | struct mddev *mddev2; |
efeb53c0 N |
4818 | spin_lock(&all_mddevs_lock); |
4819 | ||
4820 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4821 | if (mddev2->gendisk && | |
4822 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4823 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4824 | goto abort; |
efeb53c0 N |
4825 | } |
4826 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4827 | } |
8b765398 | 4828 | |
0909dc44 | 4829 | error = -ENOMEM; |
8b765398 | 4830 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4831 | if (!mddev->queue) |
4832 | goto abort; | |
409c57f3 N |
4833 | mddev->queue->queuedata = mddev; |
4834 | ||
409c57f3 | 4835 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 4836 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 4837 | |
1da177e4 LT |
4838 | disk = alloc_disk(1 << shift); |
4839 | if (!disk) { | |
8b765398 N |
4840 | blk_cleanup_queue(mddev->queue); |
4841 | mddev->queue = NULL; | |
0909dc44 | 4842 | goto abort; |
1da177e4 | 4843 | } |
efeb53c0 | 4844 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4845 | disk->first_minor = unit << shift; |
efeb53c0 N |
4846 | if (name) |
4847 | strcpy(disk->disk_name, name); | |
4848 | else if (partitioned) | |
1da177e4 | 4849 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4850 | else |
1da177e4 | 4851 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4852 | disk->fops = &md_fops; |
4853 | disk->private_data = mddev; | |
4854 | disk->queue = mddev->queue; | |
b0140891 | 4855 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4856 | /* Allow extended partitions. This makes the |
d3374825 | 4857 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4858 | * remove it now. |
4859 | */ | |
4860 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4861 | mddev->gendisk = disk; |
b0140891 N |
4862 | /* As soon as we call add_disk(), another thread could get |
4863 | * through to md_open, so make sure it doesn't get too far | |
4864 | */ | |
4865 | mutex_lock(&mddev->open_mutex); | |
4866 | add_disk(disk); | |
4867 | ||
ed9e1982 TH |
4868 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4869 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4870 | if (error) { |
4871 | /* This isn't possible, but as kobject_init_and_add is marked | |
4872 | * __must_check, we must do something with the result | |
4873 | */ | |
5e55e2f5 N |
4874 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4875 | disk->disk_name); | |
0909dc44 N |
4876 | error = 0; |
4877 | } | |
00bcb4ac N |
4878 | if (mddev->kobj.sd && |
4879 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4880 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4881 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4882 | abort: |
4883 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4884 | if (!error && mddev->kobj.sd) { |
3830c62f | 4885 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4886 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4887 | } |
d3374825 | 4888 | mddev_put(mddev); |
0909dc44 | 4889 | return error; |
efeb53c0 N |
4890 | } |
4891 | ||
4892 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4893 | { | |
4894 | md_alloc(dev, NULL); | |
1da177e4 LT |
4895 | return NULL; |
4896 | } | |
4897 | ||
efeb53c0 N |
4898 | static int add_named_array(const char *val, struct kernel_param *kp) |
4899 | { | |
4900 | /* val must be "md_*" where * is not all digits. | |
4901 | * We allocate an array with a large free minor number, and | |
4902 | * set the name to val. val must not already be an active name. | |
4903 | */ | |
4904 | int len = strlen(val); | |
4905 | char buf[DISK_NAME_LEN]; | |
4906 | ||
4907 | while (len && val[len-1] == '\n') | |
4908 | len--; | |
4909 | if (len >= DISK_NAME_LEN) | |
4910 | return -E2BIG; | |
4911 | strlcpy(buf, val, len+1); | |
4912 | if (strncmp(buf, "md_", 3) != 0) | |
4913 | return -EINVAL; | |
4914 | return md_alloc(0, buf); | |
4915 | } | |
4916 | ||
1da177e4 LT |
4917 | static void md_safemode_timeout(unsigned long data) |
4918 | { | |
fd01b88c | 4919 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 4920 | |
0fd62b86 NB |
4921 | if (!atomic_read(&mddev->writes_pending)) { |
4922 | mddev->safemode = 1; | |
4923 | if (mddev->external) | |
00bcb4ac | 4924 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4925 | } |
1da177e4 LT |
4926 | md_wakeup_thread(mddev->thread); |
4927 | } | |
4928 | ||
6ff8d8ec | 4929 | static int start_dirty_degraded; |
1da177e4 | 4930 | |
fd01b88c | 4931 | int md_run(struct mddev *mddev) |
1da177e4 | 4932 | { |
2604b703 | 4933 | int err; |
3cb03002 | 4934 | struct md_rdev *rdev; |
84fc4b56 | 4935 | struct md_personality *pers; |
1da177e4 | 4936 | |
a757e64c N |
4937 | if (list_empty(&mddev->disks)) |
4938 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4939 | return -EINVAL; |
1da177e4 LT |
4940 | |
4941 | if (mddev->pers) | |
4942 | return -EBUSY; | |
bb4f1e9d N |
4943 | /* Cannot run until previous stop completes properly */ |
4944 | if (mddev->sysfs_active) | |
4945 | return -EBUSY; | |
b6eb127d | 4946 | |
1da177e4 LT |
4947 | /* |
4948 | * Analyze all RAID superblock(s) | |
4949 | */ | |
1ec4a939 N |
4950 | if (!mddev->raid_disks) { |
4951 | if (!mddev->persistent) | |
4952 | return -EINVAL; | |
a757e64c | 4953 | analyze_sbs(mddev); |
1ec4a939 | 4954 | } |
1da177e4 | 4955 | |
d9d166c2 N |
4956 | if (mddev->level != LEVEL_NONE) |
4957 | request_module("md-level-%d", mddev->level); | |
4958 | else if (mddev->clevel[0]) | |
4959 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4960 | |
4961 | /* | |
4962 | * Drop all container device buffers, from now on | |
4963 | * the only valid external interface is through the md | |
4964 | * device. | |
1da177e4 | 4965 | */ |
dafb20fa | 4966 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 4967 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4968 | continue; |
4969 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4970 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4971 | |
4972 | /* perform some consistency tests on the device. | |
4973 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4974 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4975 | */ |
a6ff7e08 JB |
4976 | if (rdev->meta_bdev) { |
4977 | /* Nothing to check */; | |
4978 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4979 | if (mddev->dev_sectors && |
4980 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4981 | > rdev->sb_start) { |
f0d76d70 N |
4982 | printk("md: %s: data overlaps metadata\n", |
4983 | mdname(mddev)); | |
4984 | return -EINVAL; | |
4985 | } | |
4986 | } else { | |
0f420358 | 4987 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4988 | > rdev->data_offset) { |
4989 | printk("md: %s: metadata overlaps data\n", | |
4990 | mdname(mddev)); | |
4991 | return -EINVAL; | |
4992 | } | |
4993 | } | |
00bcb4ac | 4994 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4995 | } |
4996 | ||
a167f663 | 4997 | if (mddev->bio_set == NULL) |
395c72a7 | 4998 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 4999 | |
1da177e4 | 5000 | spin_lock(&pers_lock); |
d9d166c2 | 5001 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 5002 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 5003 | spin_unlock(&pers_lock); |
d9d166c2 N |
5004 | if (mddev->level != LEVEL_NONE) |
5005 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
5006 | mddev->level); | |
5007 | else | |
5008 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
5009 | mddev->clevel); | |
1da177e4 LT |
5010 | return -EINVAL; |
5011 | } | |
1da177e4 | 5012 | spin_unlock(&pers_lock); |
34817e8c N |
5013 | if (mddev->level != pers->level) { |
5014 | mddev->level = pers->level; | |
5015 | mddev->new_level = pers->level; | |
5016 | } | |
d9d166c2 | 5017 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 5018 | |
f6705578 | 5019 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 5020 | pers->start_reshape == NULL) { |
f6705578 | 5021 | /* This personality cannot handle reshaping... */ |
f6705578 N |
5022 | module_put(pers->owner); |
5023 | return -EINVAL; | |
5024 | } | |
5025 | ||
7dd5e7c3 N |
5026 | if (pers->sync_request) { |
5027 | /* Warn if this is a potentially silly | |
5028 | * configuration. | |
5029 | */ | |
5030 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5031 | struct md_rdev *rdev2; |
7dd5e7c3 | 5032 | int warned = 0; |
159ec1fc | 5033 | |
dafb20fa N |
5034 | rdev_for_each(rdev, mddev) |
5035 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
5036 | if (rdev < rdev2 && |
5037 | rdev->bdev->bd_contains == | |
5038 | rdev2->bdev->bd_contains) { | |
5039 | printk(KERN_WARNING | |
5040 | "%s: WARNING: %s appears to be" | |
5041 | " on the same physical disk as" | |
5042 | " %s.\n", | |
5043 | mdname(mddev), | |
5044 | bdevname(rdev->bdev,b), | |
5045 | bdevname(rdev2->bdev,b2)); | |
5046 | warned = 1; | |
5047 | } | |
5048 | } | |
159ec1fc | 5049 | |
7dd5e7c3 N |
5050 | if (warned) |
5051 | printk(KERN_WARNING | |
5052 | "True protection against single-disk" | |
5053 | " failure might be compromised.\n"); | |
5054 | } | |
5055 | ||
657390d2 | 5056 | mddev->recovery = 0; |
58c0fed4 AN |
5057 | /* may be over-ridden by personality */ |
5058 | mddev->resync_max_sectors = mddev->dev_sectors; | |
5059 | ||
6ff8d8ec | 5060 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 5061 | |
0f9552b5 | 5062 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
5063 | mddev->ro = 2; /* read-only, but switch on first write */ |
5064 | ||
36d091f4 | 5065 | err = pers->run(mddev); |
13e53df3 AN |
5066 | if (err) |
5067 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
36d091f4 | 5068 | else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { |
b522adcd DW |
5069 | WARN_ONCE(!mddev->external_size, "%s: default size too small," |
5070 | " but 'external_size' not in effect?\n", __func__); | |
5071 | printk(KERN_ERR | |
5072 | "md: invalid array_size %llu > default size %llu\n", | |
5073 | (unsigned long long)mddev->array_sectors / 2, | |
36d091f4 | 5074 | (unsigned long long)pers->size(mddev, 0, 0) / 2); |
b522adcd | 5075 | err = -EINVAL; |
b522adcd | 5076 | } |
36d091f4 | 5077 | if (err == 0 && pers->sync_request && |
ef99bf48 | 5078 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { |
b15c2e57 | 5079 | err = bitmap_create(mddev); |
5aa61f42 | 5080 | if (err) |
b15c2e57 N |
5081 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", |
5082 | mdname(mddev), err); | |
b15c2e57 | 5083 | } |
1da177e4 | 5084 | if (err) { |
5aa61f42 | 5085 | mddev_detach(mddev); |
36d091f4 N |
5086 | pers->free(mddev, mddev->private); |
5087 | module_put(pers->owner); | |
32a7627c N |
5088 | bitmap_destroy(mddev); |
5089 | return err; | |
1da177e4 | 5090 | } |
5c675f83 N |
5091 | if (mddev->queue) { |
5092 | mddev->queue->backing_dev_info.congested_data = mddev; | |
5093 | mddev->queue->backing_dev_info.congested_fn = md_congested; | |
64590f45 | 5094 | blk_queue_merge_bvec(mddev->queue, md_mergeable_bvec); |
5c675f83 | 5095 | } |
36d091f4 | 5096 | if (pers->sync_request) { |
00bcb4ac N |
5097 | if (mddev->kobj.sd && |
5098 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
5099 | printk(KERN_WARNING |
5100 | "md: cannot register extra attributes for %s\n", | |
5101 | mdname(mddev)); | |
00bcb4ac | 5102 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 5103 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
5104 | mddev->ro = 0; |
5105 | ||
f72ffdd6 | 5106 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
5107 | atomic_set(&mddev->max_corr_read_errors, |
5108 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
5109 | mddev->safemode = 0; |
5110 | mddev->safemode_timer.function = md_safemode_timeout; | |
5111 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 5112 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 5113 | mddev->in_sync = 1; |
0ca69886 | 5114 | smp_wmb(); |
36d091f4 N |
5115 | spin_lock(&mddev->lock); |
5116 | mddev->pers = pers; | |
0ca69886 | 5117 | mddev->ready = 1; |
36d091f4 | 5118 | spin_unlock(&mddev->lock); |
dafb20fa | 5119 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5120 | if (rdev->raid_disk >= 0) |
5121 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 5122 | /* failure here is OK */; |
f72ffdd6 | 5123 | |
1da177e4 | 5124 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 5125 | |
7a0a5355 | 5126 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 5127 | md_update_sb(mddev, 0); |
1da177e4 | 5128 | |
d7603b7e | 5129 | md_new_event(mddev); |
00bcb4ac N |
5130 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
5131 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 5132 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
5133 | return 0; |
5134 | } | |
390ee602 | 5135 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 5136 | |
fd01b88c | 5137 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
5138 | { |
5139 | int err; | |
5140 | ||
5141 | err = md_run(mddev); | |
5142 | if (err) | |
5143 | goto out; | |
69e51b44 N |
5144 | err = bitmap_load(mddev); |
5145 | if (err) { | |
5146 | bitmap_destroy(mddev); | |
5147 | goto out; | |
5148 | } | |
0fd018af JB |
5149 | |
5150 | md_wakeup_thread(mddev->thread); | |
5151 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5152 | ||
fe60b014 N |
5153 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5154 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5155 | mddev->changed = 1; |
fe60b014 N |
5156 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5157 | out: | |
5158 | return err; | |
5159 | } | |
5160 | ||
fd01b88c | 5161 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5162 | { |
5163 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5164 | |
80fab1d7 | 5165 | /* Complain if it has no devices */ |
1da177e4 | 5166 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5167 | return -ENXIO; |
5168 | if (!mddev->pers) | |
5169 | return -EINVAL; | |
5170 | if (!mddev->ro) | |
5171 | return -EBUSY; | |
5172 | mddev->safemode = 0; | |
5173 | mddev->ro = 0; | |
5174 | set_disk_ro(disk, 0); | |
5175 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5176 | mdname(mddev)); | |
5177 | /* Kick recovery or resync if necessary */ | |
5178 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5179 | md_wakeup_thread(mddev->thread); | |
5180 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5181 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5182 | return 0; |
1da177e4 LT |
5183 | } |
5184 | ||
fd01b88c | 5185 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5186 | { |
5187 | mddev->array_sectors = 0; | |
5188 | mddev->external_size = 0; | |
5189 | mddev->dev_sectors = 0; | |
5190 | mddev->raid_disks = 0; | |
5191 | mddev->recovery_cp = 0; | |
5192 | mddev->resync_min = 0; | |
5193 | mddev->resync_max = MaxSector; | |
5194 | mddev->reshape_position = MaxSector; | |
5195 | mddev->external = 0; | |
5196 | mddev->persistent = 0; | |
5197 | mddev->level = LEVEL_NONE; | |
5198 | mddev->clevel[0] = 0; | |
5199 | mddev->flags = 0; | |
5200 | mddev->ro = 0; | |
5201 | mddev->metadata_type[0] = 0; | |
5202 | mddev->chunk_sectors = 0; | |
5203 | mddev->ctime = mddev->utime = 0; | |
5204 | mddev->layout = 0; | |
5205 | mddev->max_disks = 0; | |
5206 | mddev->events = 0; | |
a8707c08 | 5207 | mddev->can_decrease_events = 0; |
6177b472 | 5208 | mddev->delta_disks = 0; |
2c810cdd | 5209 | mddev->reshape_backwards = 0; |
6177b472 N |
5210 | mddev->new_level = LEVEL_NONE; |
5211 | mddev->new_layout = 0; | |
5212 | mddev->new_chunk_sectors = 0; | |
5213 | mddev->curr_resync = 0; | |
7f7583d4 | 5214 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5215 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5216 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5217 | mddev->recovery = 0; | |
5218 | mddev->in_sync = 0; | |
f0b4f7e2 | 5219 | mddev->changed = 0; |
6177b472 | 5220 | mddev->degraded = 0; |
6177b472 | 5221 | mddev->safemode = 0; |
050b6615 | 5222 | mddev->merge_check_needed = 0; |
6177b472 N |
5223 | mddev->bitmap_info.offset = 0; |
5224 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5225 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5226 | mddev->bitmap_info.chunksize = 0; |
5227 | mddev->bitmap_info.daemon_sleep = 0; | |
5228 | mddev->bitmap_info.max_write_behind = 0; | |
5229 | } | |
5230 | ||
fd01b88c | 5231 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5232 | { |
6b6204ee | 5233 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5234 | flush_workqueue(md_misc_wq); |
a047e125 | 5235 | if (mddev->sync_thread) { |
a047e125 | 5236 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5237 | md_reap_sync_thread(mddev); |
a047e125 N |
5238 | } |
5239 | ||
5240 | del_timer_sync(&mddev->safemode_timer); | |
5241 | ||
5242 | bitmap_flush(mddev); | |
5243 | md_super_wait(mddev); | |
5244 | ||
b6d428c6 | 5245 | if (mddev->ro == 0 && |
7a0a5355 | 5246 | (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) { |
a047e125 N |
5247 | /* mark array as shutdown cleanly */ |
5248 | mddev->in_sync = 1; | |
5249 | md_update_sb(mddev, 1); | |
5250 | } | |
5251 | } | |
defad61a | 5252 | |
fd01b88c | 5253 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5254 | { |
29f097c4 | 5255 | mddev_lock_nointr(mddev); |
defad61a N |
5256 | __md_stop_writes(mddev); |
5257 | mddev_unlock(mddev); | |
5258 | } | |
390ee602 | 5259 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5260 | |
5aa61f42 N |
5261 | static void mddev_detach(struct mddev *mddev) |
5262 | { | |
5263 | struct bitmap *bitmap = mddev->bitmap; | |
5264 | /* wait for behind writes to complete */ | |
5265 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
5266 | printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n", | |
5267 | mdname(mddev)); | |
5268 | /* need to kick something here to make sure I/O goes? */ | |
5269 | wait_event(bitmap->behind_wait, | |
5270 | atomic_read(&bitmap->behind_writes) == 0); | |
5271 | } | |
36d091f4 | 5272 | if (mddev->pers && mddev->pers->quiesce) { |
5aa61f42 N |
5273 | mddev->pers->quiesce(mddev, 1); |
5274 | mddev->pers->quiesce(mddev, 0); | |
5275 | } | |
5276 | md_unregister_thread(&mddev->thread); | |
5277 | if (mddev->queue) | |
5278 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
5279 | } | |
5280 | ||
5eff3c43 | 5281 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5282 | { |
36d091f4 | 5283 | struct md_personality *pers = mddev->pers; |
5aa61f42 | 5284 | mddev_detach(mddev); |
36d091f4 N |
5285 | spin_lock(&mddev->lock); |
5286 | mddev->ready = 0; | |
6177b472 | 5287 | mddev->pers = NULL; |
36d091f4 N |
5288 | spin_unlock(&mddev->lock); |
5289 | pers->free(mddev, mddev->private); | |
5290 | if (pers->sync_request && mddev->to_remove == NULL) | |
5291 | mddev->to_remove = &md_redundancy_group; | |
5292 | module_put(pers->owner); | |
cca9cf90 | 5293 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5294 | } |
5eff3c43 N |
5295 | |
5296 | void md_stop(struct mddev *mddev) | |
5297 | { | |
5298 | /* stop the array and free an attached data structures. | |
5299 | * This is called from dm-raid | |
5300 | */ | |
5301 | __md_stop(mddev); | |
5302 | bitmap_destroy(mddev); | |
5303 | if (mddev->bio_set) | |
5304 | bioset_free(mddev->bio_set); | |
5305 | } | |
5306 | ||
390ee602 | 5307 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5308 | |
a05b7ea0 | 5309 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5310 | { |
5311 | int err = 0; | |
30b8feb7 N |
5312 | int did_freeze = 0; |
5313 | ||
5314 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5315 | did_freeze = 1; | |
5316 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5317 | md_wakeup_thread(mddev->thread); | |
5318 | } | |
f851b60d | 5319 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5320 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5321 | if (mddev->sync_thread) |
30b8feb7 N |
5322 | /* Thread might be blocked waiting for metadata update |
5323 | * which will now never happen */ | |
5324 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5325 | |
30b8feb7 | 5326 | mddev_unlock(mddev); |
f851b60d N |
5327 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5328 | &mddev->recovery)); | |
30b8feb7 N |
5329 | mddev_lock_nointr(mddev); |
5330 | ||
a4bd82d0 | 5331 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5332 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5333 | mddev->sync_thread || |
f851b60d | 5334 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5335 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
a4bd82d0 | 5336 | printk("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5337 | if (did_freeze) { |
5338 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5339 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5340 | md_wakeup_thread(mddev->thread); |
5341 | } | |
a4bd82d0 N |
5342 | err = -EBUSY; |
5343 | goto out; | |
5344 | } | |
5345 | if (mddev->pers) { | |
defad61a | 5346 | __md_stop_writes(mddev); |
a4bd82d0 N |
5347 | |
5348 | err = -ENXIO; | |
5349 | if (mddev->ro==1) | |
5350 | goto out; | |
5351 | mddev->ro = 1; | |
5352 | set_disk_ro(mddev->gendisk, 1); | |
5353 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5354 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5355 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5356 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5357 | err = 0; |
a4bd82d0 N |
5358 | } |
5359 | out: | |
5360 | mutex_unlock(&mddev->open_mutex); | |
5361 | return err; | |
5362 | } | |
5363 | ||
9e653b63 N |
5364 | /* mode: |
5365 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5366 | * 2 - stop but do not disassemble array |
5367 | */ | |
f72ffdd6 | 5368 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5369 | struct block_device *bdev) |
1da177e4 | 5370 | { |
1da177e4 | 5371 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5372 | struct md_rdev *rdev; |
30b8feb7 N |
5373 | int did_freeze = 0; |
5374 | ||
5375 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5376 | did_freeze = 1; | |
5377 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5378 | md_wakeup_thread(mddev->thread); | |
5379 | } | |
f851b60d | 5380 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5381 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5382 | if (mddev->sync_thread) |
30b8feb7 N |
5383 | /* Thread might be blocked waiting for metadata update |
5384 | * which will now never happen */ | |
5385 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5386 | |
30b8feb7 | 5387 | mddev_unlock(mddev); |
f851b60d N |
5388 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5389 | !test_bit(MD_RECOVERY_RUNNING, | |
5390 | &mddev->recovery))); | |
30b8feb7 | 5391 | mddev_lock_nointr(mddev); |
1da177e4 | 5392 | |
c8c00a69 | 5393 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5394 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5395 | mddev->sysfs_active || |
5396 | mddev->sync_thread || | |
f851b60d | 5397 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5398 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
df5b20cf | 5399 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5400 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5401 | if (did_freeze) { |
5402 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5403 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5404 | md_wakeup_thread(mddev->thread); |
5405 | } | |
260fa034 N |
5406 | return -EBUSY; |
5407 | } | |
6e17b027 | 5408 | if (mddev->pers) { |
a4bd82d0 N |
5409 | if (mddev->ro) |
5410 | set_disk_ro(disk, 0); | |
409c57f3 | 5411 | |
defad61a | 5412 | __md_stop_writes(mddev); |
5eff3c43 | 5413 | __md_stop(mddev); |
a4bd82d0 | 5414 | mddev->queue->merge_bvec_fn = NULL; |
a4bd82d0 | 5415 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5416 | |
a4bd82d0 | 5417 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5418 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5419 | |
dafb20fa | 5420 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5421 | if (rdev->raid_disk >= 0) |
5422 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5423 | |
a4bd82d0 | 5424 | set_capacity(disk, 0); |
6e17b027 | 5425 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5426 | mddev->changed = 1; |
a4bd82d0 | 5427 | revalidate_disk(disk); |
0d4ca600 | 5428 | |
a4bd82d0 N |
5429 | if (mddev->ro) |
5430 | mddev->ro = 0; | |
6e17b027 N |
5431 | } else |
5432 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5433 | /* |
5434 | * Free resources if final stop | |
5435 | */ | |
9e653b63 | 5436 | if (mode == 0) { |
1da177e4 LT |
5437 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5438 | ||
978f946b | 5439 | bitmap_destroy(mddev); |
c3d9714e | 5440 | if (mddev->bitmap_info.file) { |
4af1a041 N |
5441 | struct file *f = mddev->bitmap_info.file; |
5442 | spin_lock(&mddev->lock); | |
c3d9714e | 5443 | mddev->bitmap_info.file = NULL; |
4af1a041 N |
5444 | spin_unlock(&mddev->lock); |
5445 | fput(f); | |
978f946b | 5446 | } |
c3d9714e | 5447 | mddev->bitmap_info.offset = 0; |
978f946b | 5448 | |
1da177e4 LT |
5449 | export_array(mddev); |
5450 | ||
6177b472 | 5451 | md_clean(mddev); |
934d9c23 | 5452 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5453 | if (mddev->hold_active == UNTIL_STOP) |
5454 | mddev->hold_active = 0; | |
a4bd82d0 | 5455 | } |
3f9d99c1 | 5456 | blk_integrity_unregister(disk); |
d7603b7e | 5457 | md_new_event(mddev); |
00bcb4ac | 5458 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5459 | return 0; |
1da177e4 LT |
5460 | } |
5461 | ||
fdee8ae4 | 5462 | #ifndef MODULE |
fd01b88c | 5463 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5464 | { |
3cb03002 | 5465 | struct md_rdev *rdev; |
1da177e4 LT |
5466 | int err; |
5467 | ||
a757e64c | 5468 | if (list_empty(&mddev->disks)) |
1da177e4 | 5469 | return; |
1da177e4 LT |
5470 | |
5471 | printk(KERN_INFO "md: running: "); | |
5472 | ||
dafb20fa | 5473 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5474 | char b[BDEVNAME_SIZE]; |
5475 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5476 | } | |
5477 | printk("\n"); | |
5478 | ||
d710e138 | 5479 | err = do_md_run(mddev); |
1da177e4 LT |
5480 | if (err) { |
5481 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5482 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5483 | } |
5484 | } | |
5485 | ||
5486 | /* | |
5487 | * lets try to run arrays based on all disks that have arrived | |
5488 | * until now. (those are in pending_raid_disks) | |
5489 | * | |
5490 | * the method: pick the first pending disk, collect all disks with | |
5491 | * the same UUID, remove all from the pending list and put them into | |
5492 | * the 'same_array' list. Then order this list based on superblock | |
5493 | * update time (freshest comes first), kick out 'old' disks and | |
5494 | * compare superblocks. If everything's fine then run it. | |
5495 | * | |
5496 | * If "unit" is allocated, then bump its reference count | |
5497 | */ | |
5498 | static void autorun_devices(int part) | |
5499 | { | |
3cb03002 | 5500 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5501 | struct mddev *mddev; |
1da177e4 LT |
5502 | char b[BDEVNAME_SIZE]; |
5503 | ||
5504 | printk(KERN_INFO "md: autorun ...\n"); | |
5505 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5506 | int unit; |
1da177e4 | 5507 | dev_t dev; |
ad01c9e3 | 5508 | LIST_HEAD(candidates); |
1da177e4 | 5509 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5510 | struct md_rdev, same_set); |
1da177e4 LT |
5511 | |
5512 | printk(KERN_INFO "md: considering %s ...\n", | |
5513 | bdevname(rdev0->bdev,b)); | |
5514 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5515 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5516 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5517 | printk(KERN_INFO "md: adding %s ...\n", | |
5518 | bdevname(rdev->bdev,b)); | |
5519 | list_move(&rdev->same_set, &candidates); | |
5520 | } | |
5521 | /* | |
5522 | * now we have a set of devices, with all of them having | |
5523 | * mostly sane superblocks. It's time to allocate the | |
5524 | * mddev. | |
5525 | */ | |
e8703fe1 N |
5526 | if (part) { |
5527 | dev = MKDEV(mdp_major, | |
5528 | rdev0->preferred_minor << MdpMinorShift); | |
5529 | unit = MINOR(dev) >> MdpMinorShift; | |
5530 | } else { | |
5531 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5532 | unit = MINOR(dev); | |
5533 | } | |
5534 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5535 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5536 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5537 | break; | |
5538 | } | |
1da177e4 LT |
5539 | |
5540 | md_probe(dev, NULL, NULL); | |
5541 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5542 | if (!mddev || !mddev->gendisk) { |
5543 | if (mddev) | |
5544 | mddev_put(mddev); | |
5545 | printk(KERN_ERR | |
1da177e4 LT |
5546 | "md: cannot allocate memory for md drive.\n"); |
5547 | break; | |
5548 | } | |
f72ffdd6 | 5549 | if (mddev_lock(mddev)) |
1da177e4 LT |
5550 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
5551 | mdname(mddev)); | |
5552 | else if (mddev->raid_disks || mddev->major_version | |
5553 | || !list_empty(&mddev->disks)) { | |
f72ffdd6 | 5554 | printk(KERN_WARNING |
1da177e4 LT |
5555 | "md: %s already running, cannot run %s\n", |
5556 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5557 | mddev_unlock(mddev); | |
5558 | } else { | |
5559 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5560 | mddev->persistent = 1; |
159ec1fc | 5561 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5562 | list_del_init(&rdev->same_set); |
5563 | if (bind_rdev_to_array(rdev, mddev)) | |
5564 | export_rdev(rdev); | |
5565 | } | |
5566 | autorun_array(mddev); | |
5567 | mddev_unlock(mddev); | |
5568 | } | |
5569 | /* on success, candidates will be empty, on error | |
5570 | * it won't... | |
5571 | */ | |
159ec1fc | 5572 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5573 | list_del_init(&rdev->same_set); |
1da177e4 | 5574 | export_rdev(rdev); |
4b80991c | 5575 | } |
1da177e4 LT |
5576 | mddev_put(mddev); |
5577 | } | |
5578 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5579 | } | |
fdee8ae4 | 5580 | #endif /* !MODULE */ |
1da177e4 | 5581 | |
f72ffdd6 | 5582 | static int get_version(void __user *arg) |
1da177e4 LT |
5583 | { |
5584 | mdu_version_t ver; | |
5585 | ||
5586 | ver.major = MD_MAJOR_VERSION; | |
5587 | ver.minor = MD_MINOR_VERSION; | |
5588 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5589 | ||
5590 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5591 | return -EFAULT; | |
5592 | ||
5593 | return 0; | |
5594 | } | |
5595 | ||
f72ffdd6 | 5596 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
5597 | { |
5598 | mdu_array_info_t info; | |
a9f326eb | 5599 | int nr,working,insync,failed,spare; |
3cb03002 | 5600 | struct md_rdev *rdev; |
1da177e4 | 5601 | |
1ca69c4b N |
5602 | nr = working = insync = failed = spare = 0; |
5603 | rcu_read_lock(); | |
5604 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5605 | nr++; |
b2d444d7 | 5606 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5607 | failed++; |
5608 | else { | |
5609 | working++; | |
b2d444d7 | 5610 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 5611 | insync++; |
1da177e4 LT |
5612 | else |
5613 | spare++; | |
5614 | } | |
5615 | } | |
1ca69c4b | 5616 | rcu_read_unlock(); |
1da177e4 LT |
5617 | |
5618 | info.major_version = mddev->major_version; | |
5619 | info.minor_version = mddev->minor_version; | |
5620 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5621 | info.ctime = mddev->ctime; | |
5622 | info.level = mddev->level; | |
58c0fed4 AN |
5623 | info.size = mddev->dev_sectors / 2; |
5624 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5625 | info.size = -1; |
1da177e4 LT |
5626 | info.nr_disks = nr; |
5627 | info.raid_disks = mddev->raid_disks; | |
5628 | info.md_minor = mddev->md_minor; | |
5629 | info.not_persistent= !mddev->persistent; | |
5630 | ||
5631 | info.utime = mddev->utime; | |
5632 | info.state = 0; | |
5633 | if (mddev->in_sync) | |
5634 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5635 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 5636 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5637 | info.active_disks = insync; |
1da177e4 LT |
5638 | info.working_disks = working; |
5639 | info.failed_disks = failed; | |
5640 | info.spare_disks = spare; | |
5641 | ||
5642 | info.layout = mddev->layout; | |
9d8f0363 | 5643 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5644 | |
5645 | if (copy_to_user(arg, &info, sizeof(info))) | |
5646 | return -EFAULT; | |
5647 | ||
5648 | return 0; | |
5649 | } | |
5650 | ||
f72ffdd6 | 5651 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
5652 | { |
5653 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
f4ad3d38 | 5654 | char *ptr; |
4af1a041 | 5655 | int err; |
32a7627c | 5656 | |
60559da4 | 5657 | file = kmalloc(sizeof(*file), GFP_NOIO); |
32a7627c | 5658 | if (!file) |
4af1a041 | 5659 | return -ENOMEM; |
32a7627c | 5660 | |
4af1a041 N |
5661 | err = 0; |
5662 | spin_lock(&mddev->lock); | |
32a7627c | 5663 | /* bitmap disabled, zero the first byte and copy out */ |
4af1a041 | 5664 | if (!mddev->bitmap_info.file) |
32a7627c | 5665 | file->pathname[0] = '\0'; |
4af1a041 N |
5666 | else if ((ptr = d_path(&mddev->bitmap_info.file->f_path, |
5667 | file->pathname, sizeof(file->pathname))), | |
5668 | IS_ERR(ptr)) | |
5669 | err = PTR_ERR(ptr); | |
5670 | else | |
5671 | memmove(file->pathname, ptr, | |
5672 | sizeof(file->pathname)-(ptr-file->pathname)); | |
5673 | spin_unlock(&mddev->lock); | |
32a7627c | 5674 | |
4af1a041 N |
5675 | if (err == 0 && |
5676 | copy_to_user(arg, file, sizeof(*file))) | |
32a7627c | 5677 | err = -EFAULT; |
4af1a041 | 5678 | |
32a7627c N |
5679 | kfree(file); |
5680 | return err; | |
5681 | } | |
5682 | ||
f72ffdd6 | 5683 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
5684 | { |
5685 | mdu_disk_info_t info; | |
3cb03002 | 5686 | struct md_rdev *rdev; |
1da177e4 LT |
5687 | |
5688 | if (copy_from_user(&info, arg, sizeof(info))) | |
5689 | return -EFAULT; | |
5690 | ||
1ca69c4b N |
5691 | rcu_read_lock(); |
5692 | rdev = find_rdev_nr_rcu(mddev, info.number); | |
1da177e4 LT |
5693 | if (rdev) { |
5694 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5695 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5696 | info.raid_disk = rdev->raid_disk; | |
5697 | info.state = 0; | |
b2d444d7 | 5698 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5699 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5700 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5701 | info.state |= (1<<MD_DISK_ACTIVE); |
5702 | info.state |= (1<<MD_DISK_SYNC); | |
5703 | } | |
8ddf9efe N |
5704 | if (test_bit(WriteMostly, &rdev->flags)) |
5705 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5706 | } else { |
5707 | info.major = info.minor = 0; | |
5708 | info.raid_disk = -1; | |
5709 | info.state = (1<<MD_DISK_REMOVED); | |
5710 | } | |
1ca69c4b | 5711 | rcu_read_unlock(); |
1da177e4 LT |
5712 | |
5713 | if (copy_to_user(arg, &info, sizeof(info))) | |
5714 | return -EFAULT; | |
5715 | ||
5716 | return 0; | |
5717 | } | |
5718 | ||
f72ffdd6 | 5719 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5720 | { |
5721 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5722 | struct md_rdev *rdev; |
1da177e4 LT |
5723 | dev_t dev = MKDEV(info->major,info->minor); |
5724 | ||
5725 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5726 | return -EOVERFLOW; | |
5727 | ||
5728 | if (!mddev->raid_disks) { | |
5729 | int err; | |
5730 | /* expecting a device which has a superblock */ | |
5731 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5732 | if (IS_ERR(rdev)) { | |
f72ffdd6 | 5733 | printk(KERN_WARNING |
1da177e4 LT |
5734 | "md: md_import_device returned %ld\n", |
5735 | PTR_ERR(rdev)); | |
5736 | return PTR_ERR(rdev); | |
5737 | } | |
5738 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5739 | struct md_rdev *rdev0 |
5740 | = list_entry(mddev->disks.next, | |
5741 | struct md_rdev, same_set); | |
a9f326eb | 5742 | err = super_types[mddev->major_version] |
1da177e4 LT |
5743 | .load_super(rdev, rdev0, mddev->minor_version); |
5744 | if (err < 0) { | |
f72ffdd6 | 5745 | printk(KERN_WARNING |
1da177e4 | 5746 | "md: %s has different UUID to %s\n", |
f72ffdd6 | 5747 | bdevname(rdev->bdev,b), |
1da177e4 LT |
5748 | bdevname(rdev0->bdev,b2)); |
5749 | export_rdev(rdev); | |
5750 | return -EINVAL; | |
5751 | } | |
5752 | } | |
5753 | err = bind_rdev_to_array(rdev, mddev); | |
5754 | if (err) | |
5755 | export_rdev(rdev); | |
5756 | return err; | |
5757 | } | |
5758 | ||
5759 | /* | |
5760 | * add_new_disk can be used once the array is assembled | |
5761 | * to add "hot spares". They must already have a superblock | |
5762 | * written | |
5763 | */ | |
5764 | if (mddev->pers) { | |
5765 | int err; | |
5766 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5767 | printk(KERN_WARNING |
1da177e4 LT |
5768 | "%s: personality does not support diskops!\n", |
5769 | mdname(mddev)); | |
5770 | return -EINVAL; | |
5771 | } | |
7b1e35f6 N |
5772 | if (mddev->persistent) |
5773 | rdev = md_import_device(dev, mddev->major_version, | |
5774 | mddev->minor_version); | |
5775 | else | |
5776 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 5777 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5778 | printk(KERN_WARNING |
1da177e4 LT |
5779 | "md: md_import_device returned %ld\n", |
5780 | PTR_ERR(rdev)); | |
5781 | return PTR_ERR(rdev); | |
5782 | } | |
1a855a06 | 5783 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5784 | if (!mddev->persistent) { |
5785 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5786 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5787 | rdev->raid_disk = info->raid_disk; |
bf572541 | 5788 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 5789 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 5790 | } else |
41158c7e | 5791 | rdev->raid_disk = -1; |
f466722c | 5792 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
5793 | } else |
5794 | super_types[mddev->major_version]. | |
5795 | validate_super(mddev, rdev); | |
bedd86b7 | 5796 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 5797 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
5798 | /* This was a hot-add request, but events doesn't |
5799 | * match, so reject it. | |
5800 | */ | |
5801 | export_rdev(rdev); | |
5802 | return -EINVAL; | |
5803 | } | |
5804 | ||
b2d444d7 | 5805 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5806 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5807 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5808 | else |
5809 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5810 | |
1da177e4 LT |
5811 | rdev->raid_disk = -1; |
5812 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5813 | if (!err && !mddev->pers->hot_remove_disk) { |
5814 | /* If there is hot_add_disk but no hot_remove_disk | |
5815 | * then added disks for geometry changes, | |
5816 | * and should be added immediately. | |
5817 | */ | |
5818 | super_types[mddev->major_version]. | |
5819 | validate_super(mddev, rdev); | |
5820 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5821 | if (err) | |
5822 | unbind_rdev_from_array(rdev); | |
5823 | } | |
1da177e4 LT |
5824 | if (err) |
5825 | export_rdev(rdev); | |
52664732 | 5826 | else |
00bcb4ac | 5827 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5828 | |
7ceb17e8 | 5829 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
72a23c21 NB |
5830 | if (mddev->degraded) |
5831 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5832 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5833 | if (!err) |
5834 | md_new_event(mddev); | |
005eca5e | 5835 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5836 | return err; |
5837 | } | |
5838 | ||
5839 | /* otherwise, add_new_disk is only allowed | |
5840 | * for major_version==0 superblocks | |
5841 | */ | |
5842 | if (mddev->major_version != 0) { | |
5843 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5844 | mdname(mddev)); | |
5845 | return -EINVAL; | |
5846 | } | |
5847 | ||
5848 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5849 | int err; | |
d710e138 | 5850 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5851 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5852 | printk(KERN_WARNING |
1da177e4 LT |
5853 | "md: error, md_import_device() returned %ld\n", |
5854 | PTR_ERR(rdev)); | |
5855 | return PTR_ERR(rdev); | |
5856 | } | |
5857 | rdev->desc_nr = info->number; | |
5858 | if (info->raid_disk < mddev->raid_disks) | |
5859 | rdev->raid_disk = info->raid_disk; | |
5860 | else | |
5861 | rdev->raid_disk = -1; | |
5862 | ||
1da177e4 | 5863 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5864 | if (info->state & (1<<MD_DISK_SYNC)) |
5865 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5866 | |
8ddf9efe N |
5867 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5868 | set_bit(WriteMostly, &rdev->flags); | |
5869 | ||
1da177e4 LT |
5870 | if (!mddev->persistent) { |
5871 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5872 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5873 | } else | |
57b2caa3 | 5874 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5875 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5876 | |
2bf071bf N |
5877 | err = bind_rdev_to_array(rdev, mddev); |
5878 | if (err) { | |
5879 | export_rdev(rdev); | |
5880 | return err; | |
5881 | } | |
1da177e4 LT |
5882 | } |
5883 | ||
5884 | return 0; | |
5885 | } | |
5886 | ||
f72ffdd6 | 5887 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5888 | { |
5889 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 5890 | struct md_rdev *rdev; |
1da177e4 | 5891 | |
1da177e4 LT |
5892 | rdev = find_rdev(mddev, dev); |
5893 | if (!rdev) | |
5894 | return -ENXIO; | |
5895 | ||
3ea8929d N |
5896 | clear_bit(Blocked, &rdev->flags); |
5897 | remove_and_add_spares(mddev, rdev); | |
5898 | ||
1da177e4 LT |
5899 | if (rdev->raid_disk >= 0) |
5900 | goto busy; | |
5901 | ||
5902 | kick_rdev_from_array(rdev); | |
850b2b42 | 5903 | md_update_sb(mddev, 1); |
d7603b7e | 5904 | md_new_event(mddev); |
1da177e4 LT |
5905 | |
5906 | return 0; | |
5907 | busy: | |
fdefa4d8 | 5908 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5909 | bdevname(rdev->bdev,b), mdname(mddev)); |
5910 | return -EBUSY; | |
5911 | } | |
5912 | ||
f72ffdd6 | 5913 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5914 | { |
5915 | char b[BDEVNAME_SIZE]; | |
5916 | int err; | |
3cb03002 | 5917 | struct md_rdev *rdev; |
1da177e4 LT |
5918 | |
5919 | if (!mddev->pers) | |
5920 | return -ENODEV; | |
5921 | ||
5922 | if (mddev->major_version != 0) { | |
5923 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5924 | " version-0 superblocks.\n", | |
5925 | mdname(mddev)); | |
5926 | return -EINVAL; | |
5927 | } | |
5928 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5929 | printk(KERN_WARNING |
1da177e4 LT |
5930 | "%s: personality does not support diskops!\n", |
5931 | mdname(mddev)); | |
5932 | return -EINVAL; | |
5933 | } | |
5934 | ||
d710e138 | 5935 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5936 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5937 | printk(KERN_WARNING |
1da177e4 LT |
5938 | "md: error, md_import_device() returned %ld\n", |
5939 | PTR_ERR(rdev)); | |
5940 | return -EINVAL; | |
5941 | } | |
5942 | ||
5943 | if (mddev->persistent) | |
57b2caa3 | 5944 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5945 | else |
77304d2a | 5946 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5947 | |
8190e754 | 5948 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5949 | |
b2d444d7 | 5950 | if (test_bit(Faulty, &rdev->flags)) { |
f72ffdd6 | 5951 | printk(KERN_WARNING |
1da177e4 LT |
5952 | "md: can not hot-add faulty %s disk to %s!\n", |
5953 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5954 | err = -EINVAL; | |
5955 | goto abort_export; | |
5956 | } | |
b2d444d7 | 5957 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5958 | rdev->desc_nr = -1; |
5842730d | 5959 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5960 | err = bind_rdev_to_array(rdev, mddev); |
5961 | if (err) | |
5962 | goto abort_export; | |
1da177e4 LT |
5963 | |
5964 | /* | |
5965 | * The rest should better be atomic, we can have disk failures | |
5966 | * noticed in interrupt contexts ... | |
5967 | */ | |
5968 | ||
1da177e4 LT |
5969 | rdev->raid_disk = -1; |
5970 | ||
850b2b42 | 5971 | md_update_sb(mddev, 1); |
1da177e4 LT |
5972 | |
5973 | /* | |
5974 | * Kick recovery, maybe this spare has to be added to the | |
5975 | * array immediately. | |
5976 | */ | |
5977 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5978 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5979 | md_new_event(mddev); |
1da177e4 LT |
5980 | return 0; |
5981 | ||
1da177e4 LT |
5982 | abort_export: |
5983 | export_rdev(rdev); | |
5984 | return err; | |
5985 | } | |
5986 | ||
fd01b88c | 5987 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 5988 | { |
035328c2 | 5989 | int err = 0; |
32a7627c | 5990 | |
36fa3063 | 5991 | if (mddev->pers) { |
d66b1b39 | 5992 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
5993 | return -EBUSY; |
5994 | if (mddev->recovery || mddev->sync_thread) | |
5995 | return -EBUSY; | |
5996 | /* we should be able to change the bitmap.. */ | |
5997 | } | |
32a7627c | 5998 | |
36fa3063 | 5999 | if (fd >= 0) { |
035328c2 | 6000 | struct inode *inode; |
1e594bb2 N |
6001 | struct file *f; |
6002 | ||
6003 | if (mddev->bitmap || mddev->bitmap_info.file) | |
36fa3063 | 6004 | return -EEXIST; /* cannot add when bitmap is present */ |
1e594bb2 | 6005 | f = fget(fd); |
32a7627c | 6006 | |
1e594bb2 | 6007 | if (f == NULL) { |
36fa3063 N |
6008 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
6009 | mdname(mddev)); | |
6010 | return -EBADF; | |
6011 | } | |
6012 | ||
1e594bb2 | 6013 | inode = f->f_mapping->host; |
035328c2 N |
6014 | if (!S_ISREG(inode->i_mode)) { |
6015 | printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", | |
6016 | mdname(mddev)); | |
6017 | err = -EBADF; | |
1e594bb2 | 6018 | } else if (!(f->f_mode & FMODE_WRITE)) { |
035328c2 N |
6019 | printk(KERN_ERR "%s: error: bitmap file must open for write\n", |
6020 | mdname(mddev)); | |
6021 | err = -EBADF; | |
6022 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
36fa3063 N |
6023 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
6024 | mdname(mddev)); | |
035328c2 N |
6025 | err = -EBUSY; |
6026 | } | |
6027 | if (err) { | |
1e594bb2 | 6028 | fput(f); |
36fa3063 N |
6029 | return err; |
6030 | } | |
1e594bb2 | 6031 | mddev->bitmap_info.file = f; |
c3d9714e | 6032 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
6033 | } else if (mddev->bitmap == NULL) |
6034 | return -ENOENT; /* cannot remove what isn't there */ | |
6035 | err = 0; | |
6036 | if (mddev->pers) { | |
6037 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 6038 | if (fd >= 0) { |
36fa3063 | 6039 | err = bitmap_create(mddev); |
69e51b44 N |
6040 | if (!err) |
6041 | err = bitmap_load(mddev); | |
6042 | } | |
d7375ab3 | 6043 | if (fd < 0 || err) { |
36fa3063 | 6044 | bitmap_destroy(mddev); |
d7375ab3 N |
6045 | fd = -1; /* make sure to put the file */ |
6046 | } | |
36fa3063 | 6047 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
6048 | } |
6049 | if (fd < 0) { | |
4af1a041 N |
6050 | struct file *f = mddev->bitmap_info.file; |
6051 | if (f) { | |
6052 | spin_lock(&mddev->lock); | |
6053 | mddev->bitmap_info.file = NULL; | |
6054 | spin_unlock(&mddev->lock); | |
6055 | fput(f); | |
6056 | } | |
36fa3063 N |
6057 | } |
6058 | ||
32a7627c N |
6059 | return err; |
6060 | } | |
6061 | ||
1da177e4 LT |
6062 | /* |
6063 | * set_array_info is used two different ways | |
6064 | * The original usage is when creating a new array. | |
6065 | * In this usage, raid_disks is > 0 and it together with | |
6066 | * level, size, not_persistent,layout,chunksize determine the | |
6067 | * shape of the array. | |
6068 | * This will always create an array with a type-0.90.0 superblock. | |
6069 | * The newer usage is when assembling an array. | |
6070 | * In this case raid_disks will be 0, and the major_version field is | |
6071 | * use to determine which style super-blocks are to be found on the devices. | |
6072 | * The minor and patch _version numbers are also kept incase the | |
6073 | * super_block handler wishes to interpret them. | |
6074 | */ | |
f72ffdd6 | 6075 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6076 | { |
6077 | ||
6078 | if (info->raid_disks == 0) { | |
6079 | /* just setting version number for superblock loading */ | |
6080 | if (info->major_version < 0 || | |
50511da3 | 6081 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
6082 | super_types[info->major_version].name == NULL) { |
6083 | /* maybe try to auto-load a module? */ | |
f72ffdd6 | 6084 | printk(KERN_INFO |
1da177e4 LT |
6085 | "md: superblock version %d not known\n", |
6086 | info->major_version); | |
6087 | return -EINVAL; | |
6088 | } | |
6089 | mddev->major_version = info->major_version; | |
6090 | mddev->minor_version = info->minor_version; | |
6091 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 6092 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
6093 | /* ensure mddev_put doesn't delete this now that there |
6094 | * is some minimal configuration. | |
6095 | */ | |
6096 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
6097 | return 0; |
6098 | } | |
6099 | mddev->major_version = MD_MAJOR_VERSION; | |
6100 | mddev->minor_version = MD_MINOR_VERSION; | |
6101 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
6102 | mddev->ctime = get_seconds(); | |
6103 | ||
6104 | mddev->level = info->level; | |
17115e03 | 6105 | mddev->clevel[0] = 0; |
58c0fed4 | 6106 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
6107 | mddev->raid_disks = info->raid_disks; |
6108 | /* don't set md_minor, it is determined by which /dev/md* was | |
6109 | * openned | |
6110 | */ | |
6111 | if (info->state & (1<<MD_SB_CLEAN)) | |
6112 | mddev->recovery_cp = MaxSector; | |
6113 | else | |
6114 | mddev->recovery_cp = 0; | |
6115 | mddev->persistent = ! info->not_persistent; | |
e691063a | 6116 | mddev->external = 0; |
1da177e4 LT |
6117 | |
6118 | mddev->layout = info->layout; | |
9d8f0363 | 6119 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
6120 | |
6121 | mddev->max_disks = MD_SB_DISKS; | |
6122 | ||
e691063a N |
6123 | if (mddev->persistent) |
6124 | mddev->flags = 0; | |
850b2b42 | 6125 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6126 | |
c3d9714e | 6127 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 6128 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 6129 | mddev->bitmap_info.offset = 0; |
b2a2703c | 6130 | |
f6705578 N |
6131 | mddev->reshape_position = MaxSector; |
6132 | ||
1da177e4 LT |
6133 | /* |
6134 | * Generate a 128 bit UUID | |
6135 | */ | |
6136 | get_random_bytes(mddev->uuid, 16); | |
6137 | ||
f6705578 | 6138 | mddev->new_level = mddev->level; |
664e7c41 | 6139 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
6140 | mddev->new_layout = mddev->layout; |
6141 | mddev->delta_disks = 0; | |
2c810cdd | 6142 | mddev->reshape_backwards = 0; |
f6705578 | 6143 | |
1da177e4 LT |
6144 | return 0; |
6145 | } | |
6146 | ||
fd01b88c | 6147 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 6148 | { |
b522adcd DW |
6149 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
6150 | ||
6151 | if (mddev->external_size) | |
6152 | return; | |
6153 | ||
1f403624 DW |
6154 | mddev->array_sectors = array_sectors; |
6155 | } | |
6156 | EXPORT_SYMBOL(md_set_array_sectors); | |
6157 | ||
fd01b88c | 6158 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6159 | { |
3cb03002 | 6160 | struct md_rdev *rdev; |
a35b0d69 | 6161 | int rv; |
d71f9f88 | 6162 | int fit = (num_sectors == 0); |
a35b0d69 N |
6163 | |
6164 | if (mddev->pers->resize == NULL) | |
6165 | return -EINVAL; | |
d71f9f88 AN |
6166 | /* The "num_sectors" is the number of sectors of each device that |
6167 | * is used. This can only make sense for arrays with redundancy. | |
6168 | * linear and raid0 always use whatever space is available. We can only | |
6169 | * consider changing this number if no resync or reconstruction is | |
6170 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6171 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6172 | * of each device. If num_sectors is zero, we find the largest size |
6173 | * that fits. | |
a35b0d69 | 6174 | */ |
f851b60d N |
6175 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
6176 | mddev->sync_thread) | |
a35b0d69 | 6177 | return -EBUSY; |
bd8839e0 N |
6178 | if (mddev->ro) |
6179 | return -EROFS; | |
a4a6125a | 6180 | |
dafb20fa | 6181 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6182 | sector_t avail = rdev->sectors; |
01ab5662 | 6183 | |
d71f9f88 AN |
6184 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6185 | num_sectors = avail; | |
6186 | if (avail < num_sectors) | |
a35b0d69 N |
6187 | return -ENOSPC; |
6188 | } | |
d71f9f88 | 6189 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6190 | if (!rv) |
6191 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6192 | return rv; |
6193 | } | |
6194 | ||
fd01b88c | 6195 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6196 | { |
6197 | int rv; | |
c6563a8c | 6198 | struct md_rdev *rdev; |
da943b99 | 6199 | /* change the number of raid disks */ |
63c70c4f | 6200 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6201 | return -EINVAL; |
bd8839e0 N |
6202 | if (mddev->ro) |
6203 | return -EROFS; | |
da943b99 | 6204 | if (raid_disks <= 0 || |
233fca36 | 6205 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6206 | return -EINVAL; |
f851b60d N |
6207 | if (mddev->sync_thread || |
6208 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6209 | mddev->reshape_position != MaxSector) | |
da943b99 | 6210 | return -EBUSY; |
c6563a8c N |
6211 | |
6212 | rdev_for_each(rdev, mddev) { | |
6213 | if (mddev->raid_disks < raid_disks && | |
6214 | rdev->data_offset < rdev->new_data_offset) | |
6215 | return -EINVAL; | |
6216 | if (mddev->raid_disks > raid_disks && | |
6217 | rdev->data_offset > rdev->new_data_offset) | |
6218 | return -EINVAL; | |
6219 | } | |
6220 | ||
63c70c4f | 6221 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6222 | if (mddev->delta_disks < 0) |
6223 | mddev->reshape_backwards = 1; | |
6224 | else if (mddev->delta_disks > 0) | |
6225 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6226 | |
6227 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6228 | if (rv < 0) { |
de171cb9 | 6229 | mddev->delta_disks = 0; |
2c810cdd N |
6230 | mddev->reshape_backwards = 0; |
6231 | } | |
da943b99 N |
6232 | return rv; |
6233 | } | |
6234 | ||
1da177e4 LT |
6235 | /* |
6236 | * update_array_info is used to change the configuration of an | |
6237 | * on-line array. | |
6238 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6239 | * fields in the info are checked against the array. | |
6240 | * Any differences that cannot be handled will cause an error. | |
6241 | * Normally, only one change can be managed at a time. | |
6242 | */ | |
fd01b88c | 6243 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6244 | { |
6245 | int rv = 0; | |
6246 | int cnt = 0; | |
36fa3063 N |
6247 | int state = 0; |
6248 | ||
6249 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6250 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6251 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6252 | |
6253 | if (mddev->major_version != info->major_version || | |
6254 | mddev->minor_version != info->minor_version || | |
6255 | /* mddev->patch_version != info->patch_version || */ | |
6256 | mddev->ctime != info->ctime || | |
6257 | mddev->level != info->level || | |
6258 | /* mddev->layout != info->layout || */ | |
6259 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 6260 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6261 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6262 | ((state^info->state) & 0xfffffe00) | |
6263 | ) | |
1da177e4 LT |
6264 | return -EINVAL; |
6265 | /* Check there is only one change */ | |
58c0fed4 AN |
6266 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6267 | cnt++; | |
6268 | if (mddev->raid_disks != info->raid_disks) | |
6269 | cnt++; | |
6270 | if (mddev->layout != info->layout) | |
6271 | cnt++; | |
6272 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6273 | cnt++; | |
6274 | if (cnt == 0) | |
6275 | return 0; | |
6276 | if (cnt > 1) | |
6277 | return -EINVAL; | |
1da177e4 LT |
6278 | |
6279 | if (mddev->layout != info->layout) { | |
6280 | /* Change layout | |
6281 | * we don't need to do anything at the md level, the | |
6282 | * personality will take care of it all. | |
6283 | */ | |
50ac168a | 6284 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6285 | return -EINVAL; |
597a711b N |
6286 | else { |
6287 | mddev->new_layout = info->layout; | |
50ac168a | 6288 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6289 | if (rv) |
6290 | mddev->new_layout = mddev->layout; | |
6291 | return rv; | |
6292 | } | |
1da177e4 | 6293 | } |
58c0fed4 | 6294 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6295 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6296 | |
da943b99 N |
6297 | if (mddev->raid_disks != info->raid_disks) |
6298 | rv = update_raid_disks(mddev, info->raid_disks); | |
6299 | ||
36fa3063 | 6300 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
d66b1b39 | 6301 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) |
36fa3063 N |
6302 | return -EINVAL; |
6303 | if (mddev->recovery || mddev->sync_thread) | |
6304 | return -EBUSY; | |
6305 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
6306 | /* add the bitmap */ | |
6307 | if (mddev->bitmap) | |
6308 | return -EEXIST; | |
c3d9714e | 6309 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 6310 | return -EINVAL; |
c3d9714e N |
6311 | mddev->bitmap_info.offset = |
6312 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6313 | mddev->bitmap_info.space = |
6314 | mddev->bitmap_info.default_space; | |
36fa3063 N |
6315 | mddev->pers->quiesce(mddev, 1); |
6316 | rv = bitmap_create(mddev); | |
69e51b44 N |
6317 | if (!rv) |
6318 | rv = bitmap_load(mddev); | |
36fa3063 N |
6319 | if (rv) |
6320 | bitmap_destroy(mddev); | |
6321 | mddev->pers->quiesce(mddev, 0); | |
6322 | } else { | |
6323 | /* remove the bitmap */ | |
6324 | if (!mddev->bitmap) | |
6325 | return -ENOENT; | |
1ec885cd | 6326 | if (mddev->bitmap->storage.file) |
36fa3063 N |
6327 | return -EINVAL; |
6328 | mddev->pers->quiesce(mddev, 1); | |
6329 | bitmap_destroy(mddev); | |
6330 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6331 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6332 | } |
6333 | } | |
850b2b42 | 6334 | md_update_sb(mddev, 1); |
1da177e4 LT |
6335 | return rv; |
6336 | } | |
6337 | ||
fd01b88c | 6338 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6339 | { |
3cb03002 | 6340 | struct md_rdev *rdev; |
1ca69c4b | 6341 | int err = 0; |
1da177e4 LT |
6342 | |
6343 | if (mddev->pers == NULL) | |
6344 | return -ENODEV; | |
6345 | ||
1ca69c4b N |
6346 | rcu_read_lock(); |
6347 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6348 | if (!rdev) |
1ca69c4b N |
6349 | err = -ENODEV; |
6350 | else { | |
6351 | md_error(mddev, rdev); | |
6352 | if (!test_bit(Faulty, &rdev->flags)) | |
6353 | err = -EBUSY; | |
6354 | } | |
6355 | rcu_read_unlock(); | |
6356 | return err; | |
1da177e4 LT |
6357 | } |
6358 | ||
2f9618ce AN |
6359 | /* |
6360 | * We have a problem here : there is no easy way to give a CHS | |
6361 | * virtual geometry. We currently pretend that we have a 2 heads | |
6362 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6363 | * dosfs just mad... ;-) | |
6364 | */ | |
a885c8c4 CH |
6365 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6366 | { | |
fd01b88c | 6367 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6368 | |
6369 | geo->heads = 2; | |
6370 | geo->sectors = 4; | |
49ce6cea | 6371 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6372 | return 0; |
6373 | } | |
6374 | ||
cb335f88 NS |
6375 | static inline bool md_ioctl_valid(unsigned int cmd) |
6376 | { | |
6377 | switch (cmd) { | |
6378 | case ADD_NEW_DISK: | |
6379 | case BLKROSET: | |
6380 | case GET_ARRAY_INFO: | |
6381 | case GET_BITMAP_FILE: | |
6382 | case GET_DISK_INFO: | |
6383 | case HOT_ADD_DISK: | |
6384 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
6385 | case RAID_AUTORUN: |
6386 | case RAID_VERSION: | |
6387 | case RESTART_ARRAY_RW: | |
6388 | case RUN_ARRAY: | |
6389 | case SET_ARRAY_INFO: | |
6390 | case SET_BITMAP_FILE: | |
6391 | case SET_DISK_FAULTY: | |
6392 | case STOP_ARRAY: | |
6393 | case STOP_ARRAY_RO: | |
6394 | return true; | |
6395 | default: | |
6396 | return false; | |
6397 | } | |
6398 | } | |
6399 | ||
a39907fa | 6400 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6401 | unsigned int cmd, unsigned long arg) |
6402 | { | |
6403 | int err = 0; | |
6404 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6405 | struct mddev *mddev = NULL; |
e2218350 | 6406 | int ro; |
1da177e4 | 6407 | |
cb335f88 NS |
6408 | if (!md_ioctl_valid(cmd)) |
6409 | return -ENOTTY; | |
6410 | ||
506c9e44 N |
6411 | switch (cmd) { |
6412 | case RAID_VERSION: | |
6413 | case GET_ARRAY_INFO: | |
6414 | case GET_DISK_INFO: | |
6415 | break; | |
6416 | default: | |
6417 | if (!capable(CAP_SYS_ADMIN)) | |
6418 | return -EACCES; | |
6419 | } | |
1da177e4 LT |
6420 | |
6421 | /* | |
6422 | * Commands dealing with the RAID driver but not any | |
6423 | * particular array: | |
6424 | */ | |
c02c0aeb N |
6425 | switch (cmd) { |
6426 | case RAID_VERSION: | |
6427 | err = get_version(argp); | |
3adc28d8 | 6428 | goto out; |
1da177e4 | 6429 | |
1da177e4 | 6430 | #ifndef MODULE |
c02c0aeb N |
6431 | case RAID_AUTORUN: |
6432 | err = 0; | |
6433 | autostart_arrays(arg); | |
3adc28d8 | 6434 | goto out; |
1da177e4 | 6435 | #endif |
c02c0aeb | 6436 | default:; |
1da177e4 LT |
6437 | } |
6438 | ||
6439 | /* | |
6440 | * Commands creating/starting a new array: | |
6441 | */ | |
6442 | ||
a39907fa | 6443 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6444 | |
6445 | if (!mddev) { | |
6446 | BUG(); | |
3adc28d8 | 6447 | goto out; |
1da177e4 LT |
6448 | } |
6449 | ||
1ca69c4b N |
6450 | /* Some actions do not requires the mutex */ |
6451 | switch (cmd) { | |
6452 | case GET_ARRAY_INFO: | |
6453 | if (!mddev->raid_disks && !mddev->external) | |
6454 | err = -ENODEV; | |
6455 | else | |
6456 | err = get_array_info(mddev, argp); | |
3adc28d8 | 6457 | goto out; |
1ca69c4b N |
6458 | |
6459 | case GET_DISK_INFO: | |
6460 | if (!mddev->raid_disks && !mddev->external) | |
6461 | err = -ENODEV; | |
6462 | else | |
6463 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 6464 | goto out; |
1ca69c4b N |
6465 | |
6466 | case SET_DISK_FAULTY: | |
6467 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6468 | goto out; |
4af1a041 N |
6469 | |
6470 | case GET_BITMAP_FILE: | |
6471 | err = get_bitmap_file(mddev, argp); | |
6472 | goto out; | |
6473 | ||
1ca69c4b N |
6474 | } |
6475 | ||
a7a3f08d N |
6476 | if (cmd == ADD_NEW_DISK) |
6477 | /* need to ensure md_delayed_delete() has completed */ | |
6478 | flush_workqueue(md_misc_wq); | |
6479 | ||
90f5f7ad HR |
6480 | if (cmd == HOT_REMOVE_DISK) |
6481 | /* need to ensure recovery thread has run */ | |
6482 | wait_event_interruptible_timeout(mddev->sb_wait, | |
6483 | !test_bit(MD_RECOVERY_NEEDED, | |
6484 | &mddev->flags), | |
6485 | msecs_to_jiffies(5000)); | |
260fa034 N |
6486 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
6487 | /* Need to flush page cache, and ensure no-one else opens | |
6488 | * and writes | |
6489 | */ | |
6490 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 6491 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
6492 | mutex_unlock(&mddev->open_mutex); |
6493 | err = -EBUSY; | |
3adc28d8 | 6494 | goto out; |
260fa034 N |
6495 | } |
6496 | set_bit(MD_STILL_CLOSED, &mddev->flags); | |
6497 | mutex_unlock(&mddev->open_mutex); | |
6498 | sync_blockdev(bdev); | |
6499 | } | |
1da177e4 LT |
6500 | err = mddev_lock(mddev); |
6501 | if (err) { | |
f72ffdd6 | 6502 | printk(KERN_INFO |
1da177e4 LT |
6503 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
6504 | err, cmd); | |
3adc28d8 | 6505 | goto out; |
1da177e4 LT |
6506 | } |
6507 | ||
c02c0aeb N |
6508 | if (cmd == SET_ARRAY_INFO) { |
6509 | mdu_array_info_t info; | |
6510 | if (!arg) | |
6511 | memset(&info, 0, sizeof(info)); | |
6512 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6513 | err = -EFAULT; | |
3adc28d8 | 6514 | goto unlock; |
c02c0aeb N |
6515 | } |
6516 | if (mddev->pers) { | |
6517 | err = update_array_info(mddev, &info); | |
6518 | if (err) { | |
6519 | printk(KERN_WARNING "md: couldn't update" | |
6520 | " array info. %d\n", err); | |
3adc28d8 | 6521 | goto unlock; |
1da177e4 | 6522 | } |
3adc28d8 | 6523 | goto unlock; |
c02c0aeb N |
6524 | } |
6525 | if (!list_empty(&mddev->disks)) { | |
6526 | printk(KERN_WARNING | |
6527 | "md: array %s already has disks!\n", | |
6528 | mdname(mddev)); | |
6529 | err = -EBUSY; | |
3adc28d8 | 6530 | goto unlock; |
c02c0aeb N |
6531 | } |
6532 | if (mddev->raid_disks) { | |
6533 | printk(KERN_WARNING | |
6534 | "md: array %s already initialised!\n", | |
6535 | mdname(mddev)); | |
6536 | err = -EBUSY; | |
3adc28d8 | 6537 | goto unlock; |
c02c0aeb N |
6538 | } |
6539 | err = set_array_info(mddev, &info); | |
6540 | if (err) { | |
6541 | printk(KERN_WARNING "md: couldn't set" | |
6542 | " array info. %d\n", err); | |
3adc28d8 | 6543 | goto unlock; |
c02c0aeb | 6544 | } |
3adc28d8 | 6545 | goto unlock; |
1da177e4 LT |
6546 | } |
6547 | ||
6548 | /* | |
6549 | * Commands querying/configuring an existing array: | |
6550 | */ | |
32a7627c | 6551 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6552 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6553 | if ((!mddev->raid_disks && !mddev->external) |
6554 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6555 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6556 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 6557 | err = -ENODEV; |
3adc28d8 | 6558 | goto unlock; |
1da177e4 LT |
6559 | } |
6560 | ||
6561 | /* | |
6562 | * Commands even a read-only array can execute: | |
6563 | */ | |
c02c0aeb | 6564 | switch (cmd) { |
c02c0aeb N |
6565 | case RESTART_ARRAY_RW: |
6566 | err = restart_array(mddev); | |
3adc28d8 | 6567 | goto unlock; |
1da177e4 | 6568 | |
c02c0aeb N |
6569 | case STOP_ARRAY: |
6570 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 6571 | goto unlock; |
1da177e4 | 6572 | |
c02c0aeb N |
6573 | case STOP_ARRAY_RO: |
6574 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 6575 | goto unlock; |
1da177e4 | 6576 | |
3ea8929d N |
6577 | case HOT_REMOVE_DISK: |
6578 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6579 | goto unlock; |
3ea8929d | 6580 | |
7ceb17e8 N |
6581 | case ADD_NEW_DISK: |
6582 | /* We can support ADD_NEW_DISK on read-only arrays | |
6583 | * on if we are re-adding a preexisting device. | |
6584 | * So require mddev->pers and MD_DISK_SYNC. | |
6585 | */ | |
6586 | if (mddev->pers) { | |
6587 | mdu_disk_info_t info; | |
6588 | if (copy_from_user(&info, argp, sizeof(info))) | |
6589 | err = -EFAULT; | |
6590 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6591 | /* Need to clear read-only for this */ | |
6592 | break; | |
6593 | else | |
6594 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6595 | goto unlock; |
7ceb17e8 N |
6596 | } |
6597 | break; | |
6598 | ||
c02c0aeb N |
6599 | case BLKROSET: |
6600 | if (get_user(ro, (int __user *)(arg))) { | |
6601 | err = -EFAULT; | |
3adc28d8 | 6602 | goto unlock; |
c02c0aeb N |
6603 | } |
6604 | err = -EINVAL; | |
e2218350 | 6605 | |
c02c0aeb N |
6606 | /* if the bdev is going readonly the value of mddev->ro |
6607 | * does not matter, no writes are coming | |
6608 | */ | |
6609 | if (ro) | |
3adc28d8 | 6610 | goto unlock; |
e2218350 | 6611 | |
c02c0aeb N |
6612 | /* are we are already prepared for writes? */ |
6613 | if (mddev->ro != 1) | |
3adc28d8 | 6614 | goto unlock; |
e2218350 | 6615 | |
c02c0aeb N |
6616 | /* transitioning to readauto need only happen for |
6617 | * arrays that call md_write_start | |
6618 | */ | |
6619 | if (mddev->pers) { | |
6620 | err = restart_array(mddev); | |
6621 | if (err == 0) { | |
6622 | mddev->ro = 2; | |
6623 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6624 | } |
c02c0aeb | 6625 | } |
3adc28d8 | 6626 | goto unlock; |
1da177e4 LT |
6627 | } |
6628 | ||
6629 | /* | |
6630 | * The remaining ioctls are changing the state of the | |
f91de92e | 6631 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 6632 | */ |
326eb17d | 6633 | if (mddev->ro && mddev->pers) { |
f91de92e N |
6634 | if (mddev->ro == 2) { |
6635 | mddev->ro = 0; | |
00bcb4ac | 6636 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6637 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6638 | /* mddev_unlock will wake thread */ |
6639 | /* If a device failed while we were read-only, we | |
6640 | * need to make sure the metadata is updated now. | |
6641 | */ | |
6642 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6643 | mddev_unlock(mddev); | |
6644 | wait_event(mddev->sb_wait, | |
6645 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6646 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
29f097c4 | 6647 | mddev_lock_nointr(mddev); |
f3378b48 | 6648 | } |
f91de92e N |
6649 | } else { |
6650 | err = -EROFS; | |
3adc28d8 | 6651 | goto unlock; |
f91de92e | 6652 | } |
1da177e4 LT |
6653 | } |
6654 | ||
c02c0aeb N |
6655 | switch (cmd) { |
6656 | case ADD_NEW_DISK: | |
1da177e4 | 6657 | { |
c02c0aeb N |
6658 | mdu_disk_info_t info; |
6659 | if (copy_from_user(&info, argp, sizeof(info))) | |
6660 | err = -EFAULT; | |
6661 | else | |
6662 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6663 | goto unlock; |
c02c0aeb | 6664 | } |
1da177e4 | 6665 | |
c02c0aeb N |
6666 | case HOT_ADD_DISK: |
6667 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6668 | goto unlock; |
1da177e4 | 6669 | |
c02c0aeb N |
6670 | case RUN_ARRAY: |
6671 | err = do_md_run(mddev); | |
3adc28d8 | 6672 | goto unlock; |
1da177e4 | 6673 | |
c02c0aeb N |
6674 | case SET_BITMAP_FILE: |
6675 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 6676 | goto unlock; |
32a7627c | 6677 | |
c02c0aeb N |
6678 | default: |
6679 | err = -EINVAL; | |
3adc28d8 | 6680 | goto unlock; |
1da177e4 LT |
6681 | } |
6682 | ||
3adc28d8 | 6683 | unlock: |
d3374825 N |
6684 | if (mddev->hold_active == UNTIL_IOCTL && |
6685 | err != -EINVAL) | |
6686 | mddev->hold_active = 0; | |
1da177e4 | 6687 | mddev_unlock(mddev); |
3adc28d8 | 6688 | out: |
1da177e4 LT |
6689 | return err; |
6690 | } | |
aa98aa31 AB |
6691 | #ifdef CONFIG_COMPAT |
6692 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6693 | unsigned int cmd, unsigned long arg) | |
6694 | { | |
6695 | switch (cmd) { | |
6696 | case HOT_REMOVE_DISK: | |
6697 | case HOT_ADD_DISK: | |
6698 | case SET_DISK_FAULTY: | |
6699 | case SET_BITMAP_FILE: | |
6700 | /* These take in integer arg, do not convert */ | |
6701 | break; | |
6702 | default: | |
6703 | arg = (unsigned long)compat_ptr(arg); | |
6704 | break; | |
6705 | } | |
6706 | ||
6707 | return md_ioctl(bdev, mode, cmd, arg); | |
6708 | } | |
6709 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6710 | |
a39907fa | 6711 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6712 | { |
6713 | /* | |
6714 | * Succeed if we can lock the mddev, which confirms that | |
6715 | * it isn't being stopped right now. | |
6716 | */ | |
fd01b88c | 6717 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6718 | int err; |
6719 | ||
0c098220 YL |
6720 | if (!mddev) |
6721 | return -ENODEV; | |
6722 | ||
d3374825 N |
6723 | if (mddev->gendisk != bdev->bd_disk) { |
6724 | /* we are racing with mddev_put which is discarding this | |
6725 | * bd_disk. | |
6726 | */ | |
6727 | mddev_put(mddev); | |
6728 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6729 | flush_workqueue(md_misc_wq); |
d3374825 N |
6730 | /* Then retry the open from the top */ |
6731 | return -ERESTARTSYS; | |
6732 | } | |
6733 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6734 | ||
c8c00a69 | 6735 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6736 | goto out; |
6737 | ||
6738 | err = 0; | |
f2ea68cf | 6739 | atomic_inc(&mddev->openers); |
260fa034 | 6740 | clear_bit(MD_STILL_CLOSED, &mddev->flags); |
c8c00a69 | 6741 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6742 | |
f0b4f7e2 | 6743 | check_disk_change(bdev); |
1da177e4 LT |
6744 | out: |
6745 | return err; | |
6746 | } | |
6747 | ||
db2a144b | 6748 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6749 | { |
f72ffdd6 | 6750 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6751 | |
52e5f9d1 | 6752 | BUG_ON(!mddev); |
f2ea68cf | 6753 | atomic_dec(&mddev->openers); |
1da177e4 | 6754 | mddev_put(mddev); |
1da177e4 | 6755 | } |
f0b4f7e2 N |
6756 | |
6757 | static int md_media_changed(struct gendisk *disk) | |
6758 | { | |
fd01b88c | 6759 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6760 | |
6761 | return mddev->changed; | |
6762 | } | |
6763 | ||
6764 | static int md_revalidate(struct gendisk *disk) | |
6765 | { | |
fd01b88c | 6766 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6767 | |
6768 | mddev->changed = 0; | |
6769 | return 0; | |
6770 | } | |
83d5cde4 | 6771 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6772 | { |
6773 | .owner = THIS_MODULE, | |
a39907fa AV |
6774 | .open = md_open, |
6775 | .release = md_release, | |
b492b852 | 6776 | .ioctl = md_ioctl, |
aa98aa31 AB |
6777 | #ifdef CONFIG_COMPAT |
6778 | .compat_ioctl = md_compat_ioctl, | |
6779 | #endif | |
a885c8c4 | 6780 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6781 | .media_changed = md_media_changed, |
6782 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6783 | }; |
6784 | ||
f72ffdd6 | 6785 | static int md_thread(void *arg) |
1da177e4 | 6786 | { |
2b8bf345 | 6787 | struct md_thread *thread = arg; |
1da177e4 | 6788 | |
1da177e4 LT |
6789 | /* |
6790 | * md_thread is a 'system-thread', it's priority should be very | |
6791 | * high. We avoid resource deadlocks individually in each | |
6792 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6793 | * the very same RT priority as kswapd, thus we will never get | |
6794 | * into a priority inversion deadlock. | |
6795 | * | |
6796 | * we definitely have to have equal or higher priority than | |
6797 | * bdflush, otherwise bdflush will deadlock if there are too | |
6798 | * many dirty RAID5 blocks. | |
6799 | */ | |
1da177e4 | 6800 | |
6985c43f | 6801 | allow_signal(SIGKILL); |
a6fb0934 | 6802 | while (!kthread_should_stop()) { |
1da177e4 | 6803 | |
93588e22 N |
6804 | /* We need to wait INTERRUPTIBLE so that |
6805 | * we don't add to the load-average. | |
6806 | * That means we need to be sure no signals are | |
6807 | * pending | |
6808 | */ | |
6809 | if (signal_pending(current)) | |
6810 | flush_signals(current); | |
6811 | ||
6812 | wait_event_interruptible_timeout | |
6813 | (thread->wqueue, | |
6814 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6815 | || kthread_should_stop(), | |
6816 | thread->timeout); | |
1da177e4 | 6817 | |
6c987910 N |
6818 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6819 | if (!kthread_should_stop()) | |
4ed8731d | 6820 | thread->run(thread); |
1da177e4 | 6821 | } |
a6fb0934 | 6822 | |
1da177e4 LT |
6823 | return 0; |
6824 | } | |
6825 | ||
2b8bf345 | 6826 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
6827 | { |
6828 | if (thread) { | |
36a4e1fe | 6829 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
6830 | set_bit(THREAD_WAKEUP, &thread->flags); |
6831 | wake_up(&thread->wqueue); | |
6832 | } | |
6833 | } | |
6c144d31 | 6834 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 6835 | |
4ed8731d SL |
6836 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
6837 | struct mddev *mddev, const char *name) | |
1da177e4 | 6838 | { |
2b8bf345 | 6839 | struct md_thread *thread; |
1da177e4 | 6840 | |
2b8bf345 | 6841 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
6842 | if (!thread) |
6843 | return NULL; | |
6844 | ||
1da177e4 LT |
6845 | init_waitqueue_head(&thread->wqueue); |
6846 | ||
1da177e4 LT |
6847 | thread->run = run; |
6848 | thread->mddev = mddev; | |
32a7627c | 6849 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6850 | thread->tsk = kthread_run(md_thread, thread, |
6851 | "%s_%s", | |
6852 | mdname(thread->mddev), | |
0232605d | 6853 | name); |
a6fb0934 | 6854 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6855 | kfree(thread); |
6856 | return NULL; | |
6857 | } | |
1da177e4 LT |
6858 | return thread; |
6859 | } | |
6c144d31 | 6860 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 6861 | |
2b8bf345 | 6862 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 6863 | { |
2b8bf345 | 6864 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
6865 | if (!thread) |
6866 | return; | |
36a4e1fe | 6867 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
6868 | /* Locking ensures that mddev_unlock does not wake_up a |
6869 | * non-existent thread | |
6870 | */ | |
6871 | spin_lock(&pers_lock); | |
6872 | *threadp = NULL; | |
6873 | spin_unlock(&pers_lock); | |
a6fb0934 N |
6874 | |
6875 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6876 | kfree(thread); |
6877 | } | |
6c144d31 | 6878 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 6879 | |
fd01b88c | 6880 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 6881 | { |
b2d444d7 | 6882 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6883 | return; |
6bfe0b49 | 6884 | |
de393cde | 6885 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
6886 | return; |
6887 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6888 | if (mddev->degraded) |
6889 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6890 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6891 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6892 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6893 | md_wakeup_thread(mddev->thread); | |
768a418d | 6894 | if (mddev->event_work.func) |
e804ac78 | 6895 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6896 | md_new_event_inintr(mddev); |
1da177e4 | 6897 | } |
6c144d31 | 6898 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
6899 | |
6900 | /* seq_file implementation /proc/mdstat */ | |
6901 | ||
6902 | static void status_unused(struct seq_file *seq) | |
6903 | { | |
6904 | int i = 0; | |
3cb03002 | 6905 | struct md_rdev *rdev; |
1da177e4 LT |
6906 | |
6907 | seq_printf(seq, "unused devices: "); | |
6908 | ||
159ec1fc | 6909 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6910 | char b[BDEVNAME_SIZE]; |
6911 | i++; | |
6912 | seq_printf(seq, "%s ", | |
6913 | bdevname(rdev->bdev,b)); | |
6914 | } | |
6915 | if (!i) | |
6916 | seq_printf(seq, "<none>"); | |
6917 | ||
6918 | seq_printf(seq, "\n"); | |
6919 | } | |
6920 | ||
f72ffdd6 | 6921 | static void status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 6922 | { |
dd71cf6b N |
6923 | sector_t max_sectors, resync, res; |
6924 | unsigned long dt, db; | |
6925 | sector_t rt; | |
4588b42e N |
6926 | int scale; |
6927 | unsigned int per_milli; | |
1da177e4 | 6928 | |
72f36d59 N |
6929 | if (mddev->curr_resync <= 3) |
6930 | resync = 0; | |
6931 | else | |
6932 | resync = mddev->curr_resync | |
6933 | - atomic_read(&mddev->recovery_active); | |
1da177e4 | 6934 | |
c804cdec N |
6935 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
6936 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 6937 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6938 | else |
dd71cf6b | 6939 | max_sectors = mddev->dev_sectors; |
1da177e4 | 6940 | |
403df478 | 6941 | WARN_ON(max_sectors == 0); |
4588b42e | 6942 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6943 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6944 | * u32, as those are the requirements for sector_div. |
6945 | * Thus 'scale' must be at least 10 | |
6946 | */ | |
6947 | scale = 10; | |
6948 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6949 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6950 | scale++; |
6951 | } | |
6952 | res = (resync>>scale)*1000; | |
dd71cf6b | 6953 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6954 | |
6955 | per_milli = res; | |
1da177e4 | 6956 | { |
4588b42e | 6957 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6958 | seq_printf(seq, "["); |
6959 | for (i = 0; i < x; i++) | |
6960 | seq_printf(seq, "="); | |
6961 | seq_printf(seq, ">"); | |
6962 | for (i = 0; i < y; i++) | |
6963 | seq_printf(seq, "."); | |
6964 | seq_printf(seq, "] "); | |
6965 | } | |
4588b42e | 6966 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6967 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6968 | "reshape" : | |
61df9d91 N |
6969 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6970 | "check" : | |
6971 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6972 | "resync" : "recovery"))), | |
6973 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6974 | (unsigned long long) resync/2, |
6975 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6976 | |
6977 | /* | |
1da177e4 LT |
6978 | * dt: time from mark until now |
6979 | * db: blocks written from mark until now | |
6980 | * rt: remaining time | |
dd71cf6b N |
6981 | * |
6982 | * rt is a sector_t, so could be 32bit or 64bit. | |
6983 | * So we divide before multiply in case it is 32bit and close | |
6984 | * to the limit. | |
25985edc | 6985 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6986 | * near the end of resync when the number of remaining sectors |
6987 | * is close to 'db'. | |
6988 | * We then divide rt by 32 after multiplying by db to compensate. | |
6989 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6990 | */ |
6991 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6992 | if (!dt) dt++; | |
ff4e8d9a N |
6993 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6994 | - mddev->resync_mark_cnt; | |
1da177e4 | 6995 | |
dd71cf6b N |
6996 | rt = max_sectors - resync; /* number of remaining sectors */ |
6997 | sector_div(rt, db/32+1); | |
6998 | rt *= dt; | |
6999 | rt >>= 5; | |
7000 | ||
7001 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
7002 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 7003 | |
ff4e8d9a | 7004 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
7005 | } |
7006 | ||
7007 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
7008 | { | |
7009 | struct list_head *tmp; | |
7010 | loff_t l = *pos; | |
fd01b88c | 7011 | struct mddev *mddev; |
1da177e4 LT |
7012 | |
7013 | if (l >= 0x10000) | |
7014 | return NULL; | |
7015 | if (!l--) | |
7016 | /* header */ | |
7017 | return (void*)1; | |
7018 | ||
7019 | spin_lock(&all_mddevs_lock); | |
7020 | list_for_each(tmp,&all_mddevs) | |
7021 | if (!l--) { | |
fd01b88c | 7022 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
7023 | mddev_get(mddev); |
7024 | spin_unlock(&all_mddevs_lock); | |
7025 | return mddev; | |
7026 | } | |
7027 | spin_unlock(&all_mddevs_lock); | |
7028 | if (!l--) | |
7029 | return (void*)2;/* tail */ | |
7030 | return NULL; | |
7031 | } | |
7032 | ||
7033 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
7034 | { | |
7035 | struct list_head *tmp; | |
fd01b88c | 7036 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 7037 | |
1da177e4 LT |
7038 | ++*pos; |
7039 | if (v == (void*)2) | |
7040 | return NULL; | |
7041 | ||
7042 | spin_lock(&all_mddevs_lock); | |
7043 | if (v == (void*)1) | |
7044 | tmp = all_mddevs.next; | |
7045 | else | |
7046 | tmp = mddev->all_mddevs.next; | |
7047 | if (tmp != &all_mddevs) | |
fd01b88c | 7048 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
7049 | else { |
7050 | next_mddev = (void*)2; | |
7051 | *pos = 0x10000; | |
f72ffdd6 | 7052 | } |
1da177e4 LT |
7053 | spin_unlock(&all_mddevs_lock); |
7054 | ||
7055 | if (v != (void*)1) | |
7056 | mddev_put(mddev); | |
7057 | return next_mddev; | |
7058 | ||
7059 | } | |
7060 | ||
7061 | static void md_seq_stop(struct seq_file *seq, void *v) | |
7062 | { | |
fd01b88c | 7063 | struct mddev *mddev = v; |
1da177e4 LT |
7064 | |
7065 | if (mddev && v != (void*)1 && v != (void*)2) | |
7066 | mddev_put(mddev); | |
7067 | } | |
7068 | ||
7069 | static int md_seq_show(struct seq_file *seq, void *v) | |
7070 | { | |
fd01b88c | 7071 | struct mddev *mddev = v; |
dd8ac336 | 7072 | sector_t sectors; |
3cb03002 | 7073 | struct md_rdev *rdev; |
1da177e4 LT |
7074 | |
7075 | if (v == (void*)1) { | |
84fc4b56 | 7076 | struct md_personality *pers; |
1da177e4 LT |
7077 | seq_printf(seq, "Personalities : "); |
7078 | spin_lock(&pers_lock); | |
2604b703 N |
7079 | list_for_each_entry(pers, &pers_list, list) |
7080 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
7081 | |
7082 | spin_unlock(&pers_lock); | |
7083 | seq_printf(seq, "\n"); | |
f1514638 | 7084 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
7085 | return 0; |
7086 | } | |
7087 | if (v == (void*)2) { | |
7088 | status_unused(seq); | |
7089 | return 0; | |
7090 | } | |
7091 | ||
36d091f4 | 7092 | spin_lock(&mddev->lock); |
1da177e4 LT |
7093 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
7094 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
7095 | mddev->pers ? "" : "in"); | |
7096 | if (mddev->pers) { | |
f91de92e | 7097 | if (mddev->ro==1) |
1da177e4 | 7098 | seq_printf(seq, " (read-only)"); |
f91de92e | 7099 | if (mddev->ro==2) |
52720ae7 | 7100 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
7101 | seq_printf(seq, " %s", mddev->pers->name); |
7102 | } | |
7103 | ||
dd8ac336 | 7104 | sectors = 0; |
f97fcad3 N |
7105 | rcu_read_lock(); |
7106 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 LT |
7107 | char b[BDEVNAME_SIZE]; |
7108 | seq_printf(seq, " %s[%d]", | |
7109 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
7110 | if (test_bit(WriteMostly, &rdev->flags)) |
7111 | seq_printf(seq, "(W)"); | |
b2d444d7 | 7112 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7113 | seq_printf(seq, "(F)"); |
7114 | continue; | |
2d78f8c4 N |
7115 | } |
7116 | if (rdev->raid_disk < 0) | |
b325a32e | 7117 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
7118 | if (test_bit(Replacement, &rdev->flags)) |
7119 | seq_printf(seq, "(R)"); | |
dd8ac336 | 7120 | sectors += rdev->sectors; |
1da177e4 | 7121 | } |
f97fcad3 | 7122 | rcu_read_unlock(); |
1da177e4 LT |
7123 | |
7124 | if (!list_empty(&mddev->disks)) { | |
7125 | if (mddev->pers) | |
7126 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
7127 | (unsigned long long) |
7128 | mddev->array_sectors / 2); | |
1da177e4 LT |
7129 | else |
7130 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 7131 | (unsigned long long)sectors / 2); |
1da177e4 | 7132 | } |
1cd6bf19 N |
7133 | if (mddev->persistent) { |
7134 | if (mddev->major_version != 0 || | |
7135 | mddev->minor_version != 90) { | |
7136 | seq_printf(seq," super %d.%d", | |
7137 | mddev->major_version, | |
7138 | mddev->minor_version); | |
7139 | } | |
e691063a N |
7140 | } else if (mddev->external) |
7141 | seq_printf(seq, " super external:%s", | |
7142 | mddev->metadata_type); | |
7143 | else | |
1cd6bf19 | 7144 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
7145 | |
7146 | if (mddev->pers) { | |
d710e138 | 7147 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 7148 | seq_printf(seq, "\n "); |
8e1b39d6 N |
7149 | if (mddev->pers->sync_request) { |
7150 | if (mddev->curr_resync > 2) { | |
d710e138 | 7151 | status_resync(seq, mddev); |
8e1b39d6 | 7152 | seq_printf(seq, "\n "); |
72f36d59 | 7153 | } else if (mddev->curr_resync >= 1) |
8e1b39d6 N |
7154 | seq_printf(seq, "\tresync=DELAYED\n "); |
7155 | else if (mddev->recovery_cp < MaxSector) | |
7156 | seq_printf(seq, "\tresync=PENDING\n "); | |
7157 | } | |
32a7627c N |
7158 | } else |
7159 | seq_printf(seq, "\n "); | |
7160 | ||
57148964 | 7161 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7162 | |
7163 | seq_printf(seq, "\n"); | |
7164 | } | |
36d091f4 | 7165 | spin_unlock(&mddev->lock); |
f72ffdd6 | 7166 | |
1da177e4 LT |
7167 | return 0; |
7168 | } | |
7169 | ||
110518bc | 7170 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7171 | .start = md_seq_start, |
7172 | .next = md_seq_next, | |
7173 | .stop = md_seq_stop, | |
7174 | .show = md_seq_show, | |
7175 | }; | |
7176 | ||
7177 | static int md_seq_open(struct inode *inode, struct file *file) | |
7178 | { | |
f1514638 | 7179 | struct seq_file *seq; |
1da177e4 LT |
7180 | int error; |
7181 | ||
7182 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7183 | if (error) |
f1514638 KS |
7184 | return error; |
7185 | ||
7186 | seq = file->private_data; | |
7187 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7188 | return error; |
7189 | } | |
7190 | ||
e2f23b60 | 7191 | static int md_unloading; |
d7603b7e N |
7192 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7193 | { | |
f1514638 | 7194 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7195 | int mask; |
7196 | ||
e2f23b60 | 7197 | if (md_unloading) |
7d7e64f2 | 7198 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7199 | poll_wait(filp, &md_event_waiters, wait); |
7200 | ||
7201 | /* always allow read */ | |
7202 | mask = POLLIN | POLLRDNORM; | |
7203 | ||
f1514638 | 7204 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7205 | mask |= POLLERR | POLLPRI; |
7206 | return mask; | |
7207 | } | |
7208 | ||
fa027c2a | 7209 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7210 | .owner = THIS_MODULE, |
1da177e4 LT |
7211 | .open = md_seq_open, |
7212 | .read = seq_read, | |
7213 | .llseek = seq_lseek, | |
c3f94b40 | 7214 | .release = seq_release_private, |
d7603b7e | 7215 | .poll = mdstat_poll, |
1da177e4 LT |
7216 | }; |
7217 | ||
84fc4b56 | 7218 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7219 | { |
50bd3774 CY |
7220 | printk(KERN_INFO "md: %s personality registered for level %d\n", |
7221 | p->name, p->level); | |
1da177e4 | 7222 | spin_lock(&pers_lock); |
2604b703 | 7223 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7224 | spin_unlock(&pers_lock); |
7225 | return 0; | |
7226 | } | |
6c144d31 | 7227 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7228 | |
84fc4b56 | 7229 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7230 | { |
2604b703 | 7231 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7232 | spin_lock(&pers_lock); |
2604b703 | 7233 | list_del_init(&p->list); |
1da177e4 LT |
7234 | spin_unlock(&pers_lock); |
7235 | return 0; | |
7236 | } | |
6c144d31 | 7237 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7238 | |
edb39c9d GR |
7239 | int register_md_cluster_operations(struct md_cluster_operations *ops, struct module *module) |
7240 | { | |
7241 | if (md_cluster_ops != NULL) | |
7242 | return -EALREADY; | |
7243 | spin_lock(&pers_lock); | |
7244 | md_cluster_ops = ops; | |
7245 | md_cluster_mod = module; | |
7246 | spin_unlock(&pers_lock); | |
7247 | return 0; | |
7248 | } | |
7249 | EXPORT_SYMBOL(register_md_cluster_operations); | |
7250 | ||
7251 | int unregister_md_cluster_operations(void) | |
7252 | { | |
7253 | spin_lock(&pers_lock); | |
7254 | md_cluster_ops = NULL; | |
7255 | spin_unlock(&pers_lock); | |
7256 | return 0; | |
7257 | } | |
7258 | EXPORT_SYMBOL(unregister_md_cluster_operations); | |
7259 | ||
7260 | int md_setup_cluster(struct mddev *mddev, int nodes) | |
7261 | { | |
7262 | int err; | |
7263 | ||
7264 | err = request_module("md-cluster"); | |
7265 | if (err) { | |
7266 | pr_err("md-cluster module not found.\n"); | |
7267 | return err; | |
7268 | } | |
7269 | ||
7270 | spin_lock(&pers_lock); | |
7271 | if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { | |
7272 | spin_unlock(&pers_lock); | |
7273 | return -ENOENT; | |
7274 | } | |
7275 | spin_unlock(&pers_lock); | |
7276 | ||
7277 | return md_cluster_ops->join(mddev); | |
7278 | } | |
7279 | ||
7280 | void md_cluster_stop(struct mddev *mddev) | |
7281 | { | |
c4ce867f GR |
7282 | if (!md_cluster_ops) |
7283 | return; | |
edb39c9d GR |
7284 | md_cluster_ops->leave(mddev); |
7285 | module_put(md_cluster_mod); | |
7286 | } | |
7287 | ||
fd01b88c | 7288 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7289 | { |
f72ffdd6 | 7290 | struct md_rdev *rdev; |
1da177e4 | 7291 | int idle; |
eea1bf38 | 7292 | int curr_events; |
1da177e4 LT |
7293 | |
7294 | idle = 1; | |
4b80991c N |
7295 | rcu_read_lock(); |
7296 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7297 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7298 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7299 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7300 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7301 | /* sync IO will cause sync_io to increase before the disk_stats |
7302 | * as sync_io is counted when a request starts, and | |
7303 | * disk_stats is counted when it completes. | |
7304 | * So resync activity will cause curr_events to be smaller than | |
7305 | * when there was no such activity. | |
7306 | * non-sync IO will cause disk_stat to increase without | |
7307 | * increasing sync_io so curr_events will (eventually) | |
7308 | * be larger than it was before. Once it becomes | |
7309 | * substantially larger, the test below will cause | |
7310 | * the array to appear non-idle, and resync will slow | |
7311 | * down. | |
7312 | * If there is a lot of outstanding resync activity when | |
7313 | * we set last_event to curr_events, then all that activity | |
7314 | * completing might cause the array to appear non-idle | |
7315 | * and resync will be slowed down even though there might | |
7316 | * not have been non-resync activity. This will only | |
7317 | * happen once though. 'last_events' will soon reflect | |
7318 | * the state where there is little or no outstanding | |
7319 | * resync requests, and further resync activity will | |
7320 | * always make curr_events less than last_events. | |
c0e48521 | 7321 | * |
1da177e4 | 7322 | */ |
eea1bf38 | 7323 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7324 | rdev->last_events = curr_events; |
7325 | idle = 0; | |
7326 | } | |
7327 | } | |
4b80991c | 7328 | rcu_read_unlock(); |
1da177e4 LT |
7329 | return idle; |
7330 | } | |
7331 | ||
fd01b88c | 7332 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7333 | { |
7334 | /* another "blocks" (512byte) blocks have been synced */ | |
7335 | atomic_sub(blocks, &mddev->recovery_active); | |
7336 | wake_up(&mddev->recovery_wait); | |
7337 | if (!ok) { | |
dfc70645 | 7338 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7339 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7340 | md_wakeup_thread(mddev->thread); |
7341 | // stop recovery, signal do_sync .... | |
7342 | } | |
7343 | } | |
6c144d31 | 7344 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 7345 | |
06d91a5f N |
7346 | /* md_write_start(mddev, bi) |
7347 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7348 | * in superblock) before writing, schedule a superblock update |
7349 | * and wait for it to complete. | |
06d91a5f | 7350 | */ |
fd01b88c | 7351 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7352 | { |
0fd62b86 | 7353 | int did_change = 0; |
06d91a5f | 7354 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7355 | return; |
06d91a5f | 7356 | |
f91de92e N |
7357 | BUG_ON(mddev->ro == 1); |
7358 | if (mddev->ro == 2) { | |
7359 | /* need to switch to read/write */ | |
7360 | mddev->ro = 0; | |
7361 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7362 | md_wakeup_thread(mddev->thread); | |
25156198 | 7363 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7364 | did_change = 1; |
f91de92e | 7365 | } |
06d91a5f | 7366 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7367 | if (mddev->safemode == 1) |
7368 | mddev->safemode = 0; | |
06d91a5f | 7369 | if (mddev->in_sync) { |
85572d7c | 7370 | spin_lock(&mddev->lock); |
3d310eb7 N |
7371 | if (mddev->in_sync) { |
7372 | mddev->in_sync = 0; | |
850b2b42 | 7373 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7374 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7375 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7376 | did_change = 1; |
3d310eb7 | 7377 | } |
85572d7c | 7378 | spin_unlock(&mddev->lock); |
06d91a5f | 7379 | } |
0fd62b86 | 7380 | if (did_change) |
00bcb4ac | 7381 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7382 | wait_event(mddev->sb_wait, |
09a44cc1 | 7383 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 | 7384 | } |
6c144d31 | 7385 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 7386 | |
fd01b88c | 7387 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7388 | { |
7389 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7390 | if (mddev->safemode == 2) | |
7391 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7392 | else if (mddev->safemode_delay) |
1da177e4 LT |
7393 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7394 | } | |
7395 | } | |
6c144d31 | 7396 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 7397 | |
2a2275d6 N |
7398 | /* md_allow_write(mddev) |
7399 | * Calling this ensures that the array is marked 'active' so that writes | |
7400 | * may proceed without blocking. It is important to call this before | |
7401 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7402 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7403 | * |
7404 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7405 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7406 | */ |
fd01b88c | 7407 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7408 | { |
7409 | if (!mddev->pers) | |
b5470dc5 | 7410 | return 0; |
2a2275d6 | 7411 | if (mddev->ro) |
b5470dc5 | 7412 | return 0; |
1a0fd497 | 7413 | if (!mddev->pers->sync_request) |
b5470dc5 | 7414 | return 0; |
2a2275d6 | 7415 | |
85572d7c | 7416 | spin_lock(&mddev->lock); |
2a2275d6 N |
7417 | if (mddev->in_sync) { |
7418 | mddev->in_sync = 0; | |
7419 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7420 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7421 | if (mddev->safemode_delay && |
7422 | mddev->safemode == 0) | |
7423 | mddev->safemode = 1; | |
85572d7c | 7424 | spin_unlock(&mddev->lock); |
2a2275d6 | 7425 | md_update_sb(mddev, 0); |
00bcb4ac | 7426 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 | 7427 | } else |
85572d7c | 7428 | spin_unlock(&mddev->lock); |
b5470dc5 | 7429 | |
070dc6dd | 7430 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7431 | return -EAGAIN; |
7432 | else | |
7433 | return 0; | |
2a2275d6 N |
7434 | } |
7435 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7436 | ||
1da177e4 LT |
7437 | #define SYNC_MARKS 10 |
7438 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7439 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7440 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7441 | { |
4ed8731d | 7442 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7443 | struct mddev *mddev2; |
1da177e4 LT |
7444 | unsigned int currspeed = 0, |
7445 | window; | |
ac7e50a3 | 7446 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 7447 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7448 | unsigned long update_time; |
1da177e4 LT |
7449 | sector_t mark_cnt[SYNC_MARKS]; |
7450 | int last_mark,m; | |
7451 | struct list_head *tmp; | |
7452 | sector_t last_check; | |
57afd89f | 7453 | int skipped = 0; |
3cb03002 | 7454 | struct md_rdev *rdev; |
c4a39551 | 7455 | char *desc, *action = NULL; |
7c2c57c9 | 7456 | struct blk_plug plug; |
1da177e4 LT |
7457 | |
7458 | /* just incase thread restarts... */ | |
7459 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7460 | return; | |
3991b31e N |
7461 | if (mddev->ro) {/* never try to sync a read-only array */ |
7462 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 7463 | return; |
3991b31e | 7464 | } |
1da177e4 | 7465 | |
61df9d91 | 7466 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 7467 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 7468 | desc = "data-check"; |
c4a39551 JB |
7469 | action = "check"; |
7470 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 7471 | desc = "requested-resync"; |
c4a39551 JB |
7472 | action = "repair"; |
7473 | } else | |
61df9d91 N |
7474 | desc = "resync"; |
7475 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7476 | desc = "reshape"; | |
7477 | else | |
7478 | desc = "recovery"; | |
7479 | ||
c4a39551 JB |
7480 | mddev->last_sync_action = action ?: desc; |
7481 | ||
1da177e4 LT |
7482 | /* we overload curr_resync somewhat here. |
7483 | * 0 == not engaged in resync at all | |
7484 | * 2 == checking that there is no conflict with another sync | |
7485 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7486 | * commense | |
7487 | * other == active in resync - this many blocks | |
7488 | * | |
7489 | * Before starting a resync we must have set curr_resync to | |
7490 | * 2, and then checked that every "conflicting" array has curr_resync | |
7491 | * less than ours. When we find one that is the same or higher | |
7492 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7493 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7494 | * This will mean we have to start checking from the beginning again. | |
7495 | * | |
7496 | */ | |
7497 | ||
7498 | do { | |
7499 | mddev->curr_resync = 2; | |
7500 | ||
7501 | try_again: | |
404e4b43 | 7502 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 7503 | goto skip; |
29ac4aa3 | 7504 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7505 | if (mddev2 == mddev) |
7506 | continue; | |
90b08710 BS |
7507 | if (!mddev->parallel_resync |
7508 | && mddev2->curr_resync | |
7509 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7510 | DEFINE_WAIT(wq); |
7511 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7512 | /* arbitrarily yield */ | |
7513 | mddev->curr_resync = 1; | |
7514 | wake_up(&resync_wait); | |
7515 | } | |
7516 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7517 | /* no need to wait here, we can wait the next | |
7518 | * time 'round when curr_resync == 2 | |
7519 | */ | |
7520 | continue; | |
9744197c N |
7521 | /* We need to wait 'interruptible' so as not to |
7522 | * contribute to the load average, and not to | |
7523 | * be caught by 'softlockup' | |
7524 | */ | |
7525 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 7526 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 7527 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7528 | printk(KERN_INFO "md: delaying %s of %s" |
7529 | " until %s has finished (they" | |
1da177e4 | 7530 | " share one or more physical units)\n", |
61df9d91 | 7531 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7532 | mddev_put(mddev2); |
9744197c N |
7533 | if (signal_pending(current)) |
7534 | flush_signals(current); | |
1da177e4 LT |
7535 | schedule(); |
7536 | finish_wait(&resync_wait, &wq); | |
7537 | goto try_again; | |
7538 | } | |
7539 | finish_wait(&resync_wait, &wq); | |
7540 | } | |
7541 | } | |
7542 | } while (mddev->curr_resync < 2); | |
7543 | ||
5fd6c1dc | 7544 | j = 0; |
9d88883e | 7545 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7546 | /* resync follows the size requested by the personality, |
57afd89f | 7547 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7548 | */ |
7549 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7550 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7551 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7552 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7553 | j = mddev->resync_min; | |
7554 | else if (!mddev->bitmap) | |
5fd6c1dc | 7555 | j = mddev->recovery_cp; |
5e96ee65 | 7556 | |
ccfcc3c1 | 7557 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7558 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7559 | else { |
1da177e4 | 7560 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7561 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7562 | j = MaxSector; |
4e59ca7d | 7563 | rcu_read_lock(); |
dafb20fa | 7564 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc N |
7565 | if (rdev->raid_disk >= 0 && |
7566 | !test_bit(Faulty, &rdev->flags) && | |
7567 | !test_bit(In_sync, &rdev->flags) && | |
7568 | rdev->recovery_offset < j) | |
7569 | j = rdev->recovery_offset; | |
4e59ca7d | 7570 | rcu_read_unlock(); |
133d4527 N |
7571 | |
7572 | /* If there is a bitmap, we need to make sure all | |
7573 | * writes that started before we added a spare | |
7574 | * complete before we start doing a recovery. | |
7575 | * Otherwise the write might complete and (via | |
7576 | * bitmap_endwrite) set a bit in the bitmap after the | |
7577 | * recovery has checked that bit and skipped that | |
7578 | * region. | |
7579 | */ | |
7580 | if (mddev->bitmap) { | |
7581 | mddev->pers->quiesce(mddev, 1); | |
7582 | mddev->pers->quiesce(mddev, 0); | |
7583 | } | |
5fd6c1dc | 7584 | } |
1da177e4 | 7585 | |
61df9d91 N |
7586 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7587 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7588 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7589 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7590 | "(but not more than %d KB/sec) for %s.\n", |
7591 | speed_max(mddev), desc); | |
1da177e4 | 7592 | |
eea1bf38 | 7593 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7594 | |
57afd89f | 7595 | io_sectors = 0; |
1da177e4 LT |
7596 | for (m = 0; m < SYNC_MARKS; m++) { |
7597 | mark[m] = jiffies; | |
57afd89f | 7598 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7599 | } |
7600 | last_mark = 0; | |
7601 | mddev->resync_mark = mark[last_mark]; | |
7602 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7603 | ||
7604 | /* | |
7605 | * Tune reconstruction: | |
7606 | */ | |
7607 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7608 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7609 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7610 | |
7611 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7612 | last_check = 0; |
7613 | ||
7614 | if (j>2) { | |
c91abf5a | 7615 | printk(KERN_INFO |
61df9d91 N |
7616 | "md: resuming %s of %s from checkpoint.\n", |
7617 | desc, mdname(mddev)); | |
1da177e4 | 7618 | mddev->curr_resync = j; |
72f36d59 N |
7619 | } else |
7620 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7621 | mddev->curr_resync_completed = j; |
72f36d59 N |
7622 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7623 | md_new_event(mddev); | |
54f89341 | 7624 | update_time = jiffies; |
1da177e4 | 7625 | |
7c2c57c9 | 7626 | blk_start_plug(&plug); |
1da177e4 | 7627 | while (j < max_sectors) { |
57afd89f | 7628 | sector_t sectors; |
1da177e4 | 7629 | |
57afd89f | 7630 | skipped = 0; |
97e4f42d | 7631 | |
7a91ee1f N |
7632 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7633 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7634 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7635 | > (max_sectors >> 4)) || | |
54f89341 | 7636 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f N |
7637 | (j - mddev->curr_resync_completed)*2 |
7638 | >= mddev->resync_max - mddev->curr_resync_completed | |
7639 | )) { | |
97e4f42d | 7640 | /* time to update curr_resync_completed */ |
97e4f42d N |
7641 | wait_event(mddev->recovery_wait, |
7642 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7643 | mddev->curr_resync_completed = j; |
35d78c66 | 7644 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
7645 | j > mddev->recovery_cp) | |
7646 | mddev->recovery_cp = j; | |
54f89341 | 7647 | update_time = jiffies; |
070dc6dd | 7648 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7649 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7650 | } |
acb180b0 | 7651 | |
c91abf5a N |
7652 | while (j >= mddev->resync_max && |
7653 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
7654 | /* As this condition is controlled by user-space, |
7655 | * we can block indefinitely, so use '_interruptible' | |
7656 | * to avoid triggering warnings. | |
7657 | */ | |
7658 | flush_signals(current); /* just in case */ | |
7659 | wait_event_interruptible(mddev->recovery_wait, | |
7660 | mddev->resync_max > j | |
c91abf5a N |
7661 | || test_bit(MD_RECOVERY_INTR, |
7662 | &mddev->recovery)); | |
e62e58a5 | 7663 | } |
acb180b0 | 7664 | |
c91abf5a N |
7665 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7666 | break; | |
acb180b0 | 7667 | |
57afd89f | 7668 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7669 | currspeed < speed_min(mddev)); |
57afd89f | 7670 | if (sectors == 0) { |
dfc70645 | 7671 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 7672 | break; |
1da177e4 | 7673 | } |
57afd89f N |
7674 | |
7675 | if (!skipped) { /* actual IO requested */ | |
7676 | io_sectors += sectors; | |
7677 | atomic_add(sectors, &mddev->recovery_active); | |
7678 | } | |
7679 | ||
e875ecea N |
7680 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7681 | break; | |
7682 | ||
1da177e4 | 7683 | j += sectors; |
72f36d59 N |
7684 | if (j > 2) |
7685 | mddev->curr_resync = j; | |
ff4e8d9a | 7686 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7687 | if (last_check == 0) |
e875ecea | 7688 | /* this is the earliest that rebuild will be |
d7603b7e N |
7689 | * visible in /proc/mdstat |
7690 | */ | |
7691 | md_new_event(mddev); | |
57afd89f N |
7692 | |
7693 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7694 | continue; |
7695 | ||
57afd89f | 7696 | last_check = io_sectors; |
1da177e4 LT |
7697 | repeat: |
7698 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7699 | /* step marks */ | |
7700 | int next = (last_mark+1) % SYNC_MARKS; | |
7701 | ||
7702 | mddev->resync_mark = mark[next]; | |
7703 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7704 | mark[next] = jiffies; | |
57afd89f | 7705 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7706 | last_mark = next; |
7707 | } | |
7708 | ||
c91abf5a N |
7709 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7710 | break; | |
1da177e4 LT |
7711 | |
7712 | /* | |
7713 | * this loop exits only if either when we are slower than | |
7714 | * the 'hard' speed limit, or the system was IO-idle for | |
7715 | * a jiffy. | |
7716 | * the system might be non-idle CPU-wise, but we only care | |
7717 | * about not overloading the IO subsystem. (things like an | |
7718 | * e2fsck being done on the RAID array should execute fast) | |
7719 | */ | |
1da177e4 LT |
7720 | cond_resched(); |
7721 | ||
ac7e50a3 XN |
7722 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
7723 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 7724 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 7725 | |
88202a0c N |
7726 | if (currspeed > speed_min(mddev)) { |
7727 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7728 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7729 | msleep(500); |
1da177e4 LT |
7730 | goto repeat; |
7731 | } | |
7732 | } | |
7733 | } | |
c91abf5a N |
7734 | printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
7735 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
7736 | ? "interrupted" : "done"); | |
1da177e4 LT |
7737 | /* |
7738 | * this also signals 'finished resyncing' to md_stop | |
7739 | */ | |
7c2c57c9 | 7740 | blk_finish_plug(&plug); |
1da177e4 LT |
7741 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7742 | ||
7743 | /* tell personality that we are finished */ | |
57afd89f | 7744 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7745 | |
dfc70645 | 7746 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7747 | mddev->curr_resync > 2) { |
7748 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7749 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7750 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7751 | printk(KERN_INFO | |
61df9d91 N |
7752 | "md: checkpointing %s of %s.\n", |
7753 | desc, mdname(mddev)); | |
0a19caab | 7754 | if (test_bit(MD_RECOVERY_ERROR, |
7755 | &mddev->recovery)) | |
7756 | mddev->recovery_cp = | |
7757 | mddev->curr_resync_completed; | |
7758 | else | |
7759 | mddev->recovery_cp = | |
7760 | mddev->curr_resync; | |
5fd6c1dc N |
7761 | } |
7762 | } else | |
7763 | mddev->recovery_cp = MaxSector; | |
7764 | } else { | |
7765 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7766 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 7767 | rcu_read_lock(); |
dafb20fa | 7768 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7769 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7770 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7771 | !test_bit(Faulty, &rdev->flags) && |
7772 | !test_bit(In_sync, &rdev->flags) && | |
7773 | rdev->recovery_offset < mddev->curr_resync) | |
7774 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7775 | rcu_read_unlock(); |
5fd6c1dc | 7776 | } |
1da177e4 | 7777 | } |
db91ff55 | 7778 | skip: |
17571284 | 7779 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7780 | |
23da422b | 7781 | spin_lock(&mddev->lock); |
c07b70ad N |
7782 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7783 | /* We completed so min/max setting can be forgotten if used. */ | |
7784 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7785 | mddev->resync_min = 0; | |
7786 | mddev->resync_max = MaxSector; | |
7787 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7788 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 | 7789 | mddev->curr_resync = 0; |
23da422b N |
7790 | spin_unlock(&mddev->lock); |
7791 | ||
1da177e4 LT |
7792 | wake_up(&resync_wait); |
7793 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7794 | md_wakeup_thread(mddev->thread); | |
c6207277 | 7795 | return; |
1da177e4 | 7796 | } |
29269553 | 7797 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7798 | |
746d3207 N |
7799 | static int remove_and_add_spares(struct mddev *mddev, |
7800 | struct md_rdev *this) | |
b4c4c7b8 | 7801 | { |
3cb03002 | 7802 | struct md_rdev *rdev; |
b4c4c7b8 | 7803 | int spares = 0; |
f2a371c5 | 7804 | int removed = 0; |
b4c4c7b8 | 7805 | |
dafb20fa | 7806 | rdev_for_each(rdev, mddev) |
746d3207 N |
7807 | if ((this == NULL || rdev == this) && |
7808 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 7809 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7810 | (test_bit(Faulty, &rdev->flags) || |
7811 | ! test_bit(In_sync, &rdev->flags)) && | |
7812 | atomic_read(&rdev->nr_pending)==0) { | |
7813 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7814 | mddev, rdev) == 0) { |
36fad858 | 7815 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 7816 | rdev->raid_disk = -1; |
f2a371c5 | 7817 | removed++; |
b4c4c7b8 N |
7818 | } |
7819 | } | |
90584fc9 JB |
7820 | if (removed && mddev->kobj.sd) |
7821 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 7822 | |
746d3207 N |
7823 | if (this) |
7824 | goto no_add; | |
7825 | ||
dafb20fa | 7826 | rdev_for_each(rdev, mddev) { |
7bfec5f3 N |
7827 | if (rdev->raid_disk >= 0 && |
7828 | !test_bit(In_sync, &rdev->flags) && | |
7829 | !test_bit(Faulty, &rdev->flags)) | |
7830 | spares++; | |
7ceb17e8 N |
7831 | if (rdev->raid_disk >= 0) |
7832 | continue; | |
7833 | if (test_bit(Faulty, &rdev->flags)) | |
7834 | continue; | |
7835 | if (mddev->ro && | |
8313b8e5 N |
7836 | ! (rdev->saved_raid_disk >= 0 && |
7837 | !test_bit(Bitmap_sync, &rdev->flags))) | |
7ceb17e8 N |
7838 | continue; |
7839 | ||
7eb41885 N |
7840 | if (rdev->saved_raid_disk < 0) |
7841 | rdev->recovery_offset = 0; | |
7ceb17e8 N |
7842 | if (mddev->pers-> |
7843 | hot_add_disk(mddev, rdev) == 0) { | |
7844 | if (sysfs_link_rdev(mddev, rdev)) | |
7845 | /* failure here is OK */; | |
7846 | spares++; | |
7847 | md_new_event(mddev); | |
7848 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 7849 | } |
b4c4c7b8 | 7850 | } |
746d3207 | 7851 | no_add: |
6dafab6b N |
7852 | if (removed) |
7853 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
7854 | return spares; |
7855 | } | |
7ebc0be7 | 7856 | |
ac05f256 N |
7857 | static void md_start_sync(struct work_struct *ws) |
7858 | { | |
7859 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
7860 | ||
7861 | mddev->sync_thread = md_register_thread(md_do_sync, | |
7862 | mddev, | |
7863 | "resync"); | |
7864 | if (!mddev->sync_thread) { | |
7865 | printk(KERN_ERR "%s: could not start resync" | |
7866 | " thread...\n", | |
7867 | mdname(mddev)); | |
7868 | /* leave the spares where they are, it shouldn't hurt */ | |
7869 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7870 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7871 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7872 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7873 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7874 | wake_up(&resync_wait); |
ac05f256 N |
7875 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
7876 | &mddev->recovery)) | |
7877 | if (mddev->sysfs_action) | |
7878 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7879 | } else | |
7880 | md_wakeup_thread(mddev->sync_thread); | |
7881 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7882 | md_new_event(mddev); | |
7883 | } | |
7884 | ||
1da177e4 LT |
7885 | /* |
7886 | * This routine is regularly called by all per-raid-array threads to | |
7887 | * deal with generic issues like resync and super-block update. | |
7888 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7889 | * need this as they never do any recovery or update the superblock. | |
7890 | * | |
7891 | * It does not do any resync itself, but rather "forks" off other threads | |
7892 | * to do that as needed. | |
7893 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7894 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7895 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7896 | * and wakeups up this thread which will reap the thread and finish up. |
7897 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7898 | * | |
7899 | * The overall approach is: | |
7900 | * 1/ if the superblock needs updating, update it. | |
7901 | * 2/ If a recovery thread is running, don't do anything else. | |
7902 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7903 | * 4/ If there are any faulty devices, remove them. | |
7904 | * 5/ If array is degraded, try to add spares devices | |
7905 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7906 | */ | |
fd01b88c | 7907 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 7908 | { |
68866e42 JB |
7909 | if (mddev->suspended) |
7910 | return; | |
7911 | ||
5f40402d | 7912 | if (mddev->bitmap) |
aa5cbd10 | 7913 | bitmap_daemon_work(mddev); |
1da177e4 | 7914 | |
fca4d848 | 7915 | if (signal_pending(current)) { |
31a59e34 | 7916 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7917 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7918 | mdname(mddev)); | |
7919 | mddev->safemode = 2; | |
7920 | } | |
7921 | flush_signals(current); | |
7922 | } | |
7923 | ||
c89a8eee N |
7924 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7925 | return; | |
1da177e4 | 7926 | if ( ! ( |
142d44c3 | 7927 | (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7928 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7929 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7930 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7931 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7932 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7933 | )) |
7934 | return; | |
fca4d848 | 7935 | |
df5b89b3 | 7936 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7937 | int spares = 0; |
fca4d848 | 7938 | |
c89a8eee | 7939 | if (mddev->ro) { |
7ceb17e8 N |
7940 | /* On a read-only array we can: |
7941 | * - remove failed devices | |
7942 | * - add already-in_sync devices if the array itself | |
7943 | * is in-sync. | |
7944 | * As we only add devices that are already in-sync, | |
7945 | * we can activate the spares immediately. | |
c89a8eee | 7946 | */ |
7ceb17e8 | 7947 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
7948 | /* There is no thread, but we need to call |
7949 | * ->spare_active and clear saved_raid_disk | |
7950 | */ | |
2ac295a5 | 7951 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 N |
7952 | md_reap_sync_thread(mddev); |
7953 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
c89a8eee N |
7954 | goto unlock; |
7955 | } | |
7956 | ||
31a59e34 | 7957 | if (!mddev->external) { |
0fd62b86 | 7958 | int did_change = 0; |
85572d7c | 7959 | spin_lock(&mddev->lock); |
31a59e34 N |
7960 | if (mddev->safemode && |
7961 | !atomic_read(&mddev->writes_pending) && | |
7962 | !mddev->in_sync && | |
7963 | mddev->recovery_cp == MaxSector) { | |
7964 | mddev->in_sync = 1; | |
0fd62b86 | 7965 | did_change = 1; |
070dc6dd | 7966 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7967 | } |
7968 | if (mddev->safemode == 1) | |
7969 | mddev->safemode = 0; | |
85572d7c | 7970 | spin_unlock(&mddev->lock); |
0fd62b86 | 7971 | if (did_change) |
00bcb4ac | 7972 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7973 | } |
fca4d848 | 7974 | |
7a0a5355 | 7975 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 7976 | md_update_sb(mddev, 0); |
06d91a5f | 7977 | |
1da177e4 LT |
7978 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7979 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7980 | /* resync/recovery still happening */ | |
7981 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7982 | goto unlock; | |
7983 | } | |
7984 | if (mddev->sync_thread) { | |
a91d5ac0 | 7985 | md_reap_sync_thread(mddev); |
1da177e4 LT |
7986 | goto unlock; |
7987 | } | |
72a23c21 NB |
7988 | /* Set RUNNING before clearing NEEDED to avoid |
7989 | * any transients in the value of "sync_action". | |
7990 | */ | |
72f36d59 | 7991 | mddev->curr_resync_completed = 0; |
23da422b | 7992 | spin_lock(&mddev->lock); |
72a23c21 | 7993 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
23da422b | 7994 | spin_unlock(&mddev->lock); |
24dd469d N |
7995 | /* Clear some bits that don't mean anything, but |
7996 | * might be left set | |
7997 | */ | |
24dd469d N |
7998 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7999 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 8000 | |
ed209584 N |
8001 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
8002 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 8003 | goto not_running; |
1da177e4 LT |
8004 | /* no recovery is running. |
8005 | * remove any failed drives, then | |
8006 | * add spares if possible. | |
72f36d59 | 8007 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
8008 | * the personality to fail the re-add. |
8009 | */ | |
1da177e4 | 8010 | |
b4c4c7b8 | 8011 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
8012 | if (mddev->pers->check_reshape == NULL || |
8013 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 8014 | /* Cannot proceed */ |
ac05f256 | 8015 | goto not_running; |
b4c4c7b8 | 8016 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 8017 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 8018 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
8019 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8020 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 8021 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 8022 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8023 | } else if (mddev->recovery_cp < MaxSector) { |
8024 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 8025 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8026 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
8027 | /* nothing to be done ... */ | |
ac05f256 | 8028 | goto not_running; |
24dd469d | 8029 | |
1da177e4 | 8030 | if (mddev->pers->sync_request) { |
ef99bf48 | 8031 | if (spares) { |
a654b9d8 N |
8032 | /* We are adding a device or devices to an array |
8033 | * which has the bitmap stored on all devices. | |
8034 | * So make sure all bitmap pages get written | |
8035 | */ | |
8036 | bitmap_write_all(mddev->bitmap); | |
8037 | } | |
ac05f256 N |
8038 | INIT_WORK(&mddev->del_work, md_start_sync); |
8039 | queue_work(md_misc_wq, &mddev->del_work); | |
8040 | goto unlock; | |
1da177e4 | 8041 | } |
ac05f256 | 8042 | not_running: |
72a23c21 NB |
8043 | if (!mddev->sync_thread) { |
8044 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8045 | wake_up(&resync_wait); |
72a23c21 NB |
8046 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8047 | &mddev->recovery)) | |
0c3573f1 | 8048 | if (mddev->sysfs_action) |
00bcb4ac | 8049 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 8050 | } |
ac05f256 N |
8051 | unlock: |
8052 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
8053 | mddev_unlock(mddev); |
8054 | } | |
8055 | } | |
6c144d31 | 8056 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 8057 | |
a91d5ac0 JB |
8058 | void md_reap_sync_thread(struct mddev *mddev) |
8059 | { | |
8060 | struct md_rdev *rdev; | |
8061 | ||
8062 | /* resync has finished, collect result */ | |
8063 | md_unregister_thread(&mddev->sync_thread); | |
8064 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8065 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
8066 | /* success...*/ | |
8067 | /* activate any spares */ | |
8068 | if (mddev->pers->spare_active(mddev)) { | |
8069 | sysfs_notify(&mddev->kobj, NULL, | |
8070 | "degraded"); | |
8071 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
8072 | } | |
8073 | } | |
8074 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
8075 | mddev->pers->finish_reshape) | |
8076 | mddev->pers->finish_reshape(mddev); | |
8077 | ||
8078 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 8079 | * information must be scrapped. |
a91d5ac0 | 8080 | */ |
f466722c N |
8081 | if (!mddev->degraded) |
8082 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
8083 | rdev->saved_raid_disk = -1; |
8084 | ||
8085 | md_update_sb(mddev, 1); | |
8086 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
8087 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
8088 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8089 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8090 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 8091 | wake_up(&resync_wait); |
a91d5ac0 JB |
8092 | /* flag recovery needed just to double check */ |
8093 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8094 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8095 | md_new_event(mddev); | |
8096 | if (mddev->event_work.func) | |
8097 | queue_work(md_misc_wq, &mddev->event_work); | |
8098 | } | |
6c144d31 | 8099 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 8100 | |
fd01b88c | 8101 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 8102 | { |
00bcb4ac | 8103 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 8104 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
8105 | !test_bit(Blocked, &rdev->flags) && |
8106 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
8107 | msecs_to_jiffies(5000)); |
8108 | rdev_dec_pending(rdev, mddev); | |
8109 | } | |
8110 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
8111 | ||
c6563a8c N |
8112 | void md_finish_reshape(struct mddev *mddev) |
8113 | { | |
8114 | /* called be personality module when reshape completes. */ | |
8115 | struct md_rdev *rdev; | |
8116 | ||
8117 | rdev_for_each(rdev, mddev) { | |
8118 | if (rdev->data_offset > rdev->new_data_offset) | |
8119 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
8120 | else | |
8121 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
8122 | rdev->data_offset = rdev->new_data_offset; | |
8123 | } | |
8124 | } | |
8125 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
8126 | |
8127 | /* Bad block management. | |
8128 | * We can record which blocks on each device are 'bad' and so just | |
8129 | * fail those blocks, or that stripe, rather than the whole device. | |
8130 | * Entries in the bad-block table are 64bits wide. This comprises: | |
8131 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
8132 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
8133 | * A 'shift' can be set so that larger blocks are tracked and | |
8134 | * consequently larger devices can be covered. | |
8135 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
8136 | * | |
8137 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
8138 | * might need to retry if it is very unlucky. | |
8139 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
8140 | * so we use the write_seqlock_irq variant. | |
8141 | * | |
8142 | * When looking for a bad block we specify a range and want to | |
8143 | * know if any block in the range is bad. So we binary-search | |
8144 | * to the last range that starts at-or-before the given endpoint, | |
8145 | * (or "before the sector after the target range") | |
8146 | * then see if it ends after the given start. | |
8147 | * We return | |
8148 | * 0 if there are no known bad blocks in the range | |
8149 | * 1 if there are known bad block which are all acknowledged | |
8150 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
8151 | * plus the start/length of the first bad section we overlap. | |
8152 | */ | |
8153 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
8154 | sector_t *first_bad, int *bad_sectors) | |
8155 | { | |
8156 | int hi; | |
ab05613a | 8157 | int lo; |
2230dfe4 | 8158 | u64 *p = bb->page; |
ab05613a | 8159 | int rv; |
2230dfe4 N |
8160 | sector_t target = s + sectors; |
8161 | unsigned seq; | |
8162 | ||
8163 | if (bb->shift > 0) { | |
8164 | /* round the start down, and the end up */ | |
8165 | s >>= bb->shift; | |
8166 | target += (1<<bb->shift) - 1; | |
8167 | target >>= bb->shift; | |
8168 | sectors = target - s; | |
8169 | } | |
8170 | /* 'target' is now the first block after the bad range */ | |
8171 | ||
8172 | retry: | |
8173 | seq = read_seqbegin(&bb->lock); | |
ab05613a | 8174 | lo = 0; |
8175 | rv = 0; | |
2230dfe4 N |
8176 | hi = bb->count; |
8177 | ||
8178 | /* Binary search between lo and hi for 'target' | |
8179 | * i.e. for the last range that starts before 'target' | |
8180 | */ | |
8181 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
8182 | * are known not to be the last range before target. | |
8183 | * VARIANT: hi-lo is the number of possible | |
8184 | * ranges, and decreases until it reaches 1 | |
8185 | */ | |
8186 | while (hi - lo > 1) { | |
8187 | int mid = (lo + hi) / 2; | |
8188 | sector_t a = BB_OFFSET(p[mid]); | |
8189 | if (a < target) | |
8190 | /* This could still be the one, earlier ranges | |
8191 | * could not. */ | |
8192 | lo = mid; | |
8193 | else | |
8194 | /* This and later ranges are definitely out. */ | |
8195 | hi = mid; | |
8196 | } | |
8197 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
8198 | if (hi > lo) { | |
8199 | /* need to check all range that end after 's' to see if | |
8200 | * any are unacknowledged. | |
8201 | */ | |
8202 | while (lo >= 0 && | |
8203 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8204 | if (BB_OFFSET(p[lo]) < target) { | |
8205 | /* starts before the end, and finishes after | |
8206 | * the start, so they must overlap | |
8207 | */ | |
8208 | if (rv != -1 && BB_ACK(p[lo])) | |
8209 | rv = 1; | |
8210 | else | |
8211 | rv = -1; | |
8212 | *first_bad = BB_OFFSET(p[lo]); | |
8213 | *bad_sectors = BB_LEN(p[lo]); | |
8214 | } | |
8215 | lo--; | |
8216 | } | |
8217 | } | |
8218 | ||
8219 | if (read_seqretry(&bb->lock, seq)) | |
8220 | goto retry; | |
8221 | ||
8222 | return rv; | |
8223 | } | |
8224 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
8225 | ||
8226 | /* | |
8227 | * Add a range of bad blocks to the table. | |
8228 | * This might extend the table, or might contract it | |
8229 | * if two adjacent ranges can be merged. | |
8230 | * We binary-search to find the 'insertion' point, then | |
8231 | * decide how best to handle it. | |
8232 | */ | |
8233 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
8234 | int acknowledged) | |
8235 | { | |
8236 | u64 *p; | |
8237 | int lo, hi; | |
8238 | int rv = 1; | |
905b0297 | 8239 | unsigned long flags; |
2230dfe4 N |
8240 | |
8241 | if (bb->shift < 0) | |
8242 | /* badblocks are disabled */ | |
8243 | return 0; | |
8244 | ||
8245 | if (bb->shift) { | |
8246 | /* round the start down, and the end up */ | |
8247 | sector_t next = s + sectors; | |
8248 | s >>= bb->shift; | |
8249 | next += (1<<bb->shift) - 1; | |
8250 | next >>= bb->shift; | |
8251 | sectors = next - s; | |
8252 | } | |
8253 | ||
905b0297 | 8254 | write_seqlock_irqsave(&bb->lock, flags); |
2230dfe4 N |
8255 | |
8256 | p = bb->page; | |
8257 | lo = 0; | |
8258 | hi = bb->count; | |
8259 | /* Find the last range that starts at-or-before 's' */ | |
8260 | while (hi - lo > 1) { | |
8261 | int mid = (lo + hi) / 2; | |
8262 | sector_t a = BB_OFFSET(p[mid]); | |
8263 | if (a <= s) | |
8264 | lo = mid; | |
8265 | else | |
8266 | hi = mid; | |
8267 | } | |
8268 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8269 | hi = lo; | |
8270 | ||
8271 | if (hi > lo) { | |
8272 | /* we found a range that might merge with the start | |
8273 | * of our new range | |
8274 | */ | |
8275 | sector_t a = BB_OFFSET(p[lo]); | |
8276 | sector_t e = a + BB_LEN(p[lo]); | |
8277 | int ack = BB_ACK(p[lo]); | |
8278 | if (e >= s) { | |
8279 | /* Yes, we can merge with a previous range */ | |
8280 | if (s == a && s + sectors >= e) | |
8281 | /* new range covers old */ | |
8282 | ack = acknowledged; | |
8283 | else | |
8284 | ack = ack && acknowledged; | |
8285 | ||
8286 | if (e < s + sectors) | |
8287 | e = s + sectors; | |
8288 | if (e - a <= BB_MAX_LEN) { | |
8289 | p[lo] = BB_MAKE(a, e-a, ack); | |
8290 | s = e; | |
8291 | } else { | |
8292 | /* does not all fit in one range, | |
8293 | * make p[lo] maximal | |
8294 | */ | |
8295 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8296 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8297 | s = a + BB_MAX_LEN; | |
8298 | } | |
8299 | sectors = e - s; | |
8300 | } | |
8301 | } | |
8302 | if (sectors && hi < bb->count) { | |
8303 | /* 'hi' points to the first range that starts after 's'. | |
8304 | * Maybe we can merge with the start of that range */ | |
8305 | sector_t a = BB_OFFSET(p[hi]); | |
8306 | sector_t e = a + BB_LEN(p[hi]); | |
8307 | int ack = BB_ACK(p[hi]); | |
8308 | if (a <= s + sectors) { | |
8309 | /* merging is possible */ | |
8310 | if (e <= s + sectors) { | |
8311 | /* full overlap */ | |
8312 | e = s + sectors; | |
8313 | ack = acknowledged; | |
8314 | } else | |
8315 | ack = ack && acknowledged; | |
8316 | ||
8317 | a = s; | |
8318 | if (e - a <= BB_MAX_LEN) { | |
8319 | p[hi] = BB_MAKE(a, e-a, ack); | |
8320 | s = e; | |
8321 | } else { | |
8322 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8323 | s = a + BB_MAX_LEN; | |
8324 | } | |
8325 | sectors = e - s; | |
8326 | lo = hi; | |
8327 | hi++; | |
8328 | } | |
8329 | } | |
8330 | if (sectors == 0 && hi < bb->count) { | |
8331 | /* we might be able to combine lo and hi */ | |
8332 | /* Note: 's' is at the end of 'lo' */ | |
8333 | sector_t a = BB_OFFSET(p[hi]); | |
8334 | int lolen = BB_LEN(p[lo]); | |
8335 | int hilen = BB_LEN(p[hi]); | |
8336 | int newlen = lolen + hilen - (s - a); | |
8337 | if (s >= a && newlen < BB_MAX_LEN) { | |
8338 | /* yes, we can combine them */ | |
8339 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8340 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8341 | memmove(p + hi, p + hi + 1, | |
8342 | (bb->count - hi - 1) * 8); | |
8343 | bb->count--; | |
8344 | } | |
8345 | } | |
8346 | while (sectors) { | |
8347 | /* didn't merge (it all). | |
8348 | * Need to add a range just before 'hi' */ | |
8349 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8350 | /* No room for more */ | |
8351 | rv = 0; | |
8352 | break; | |
8353 | } else { | |
8354 | int this_sectors = sectors; | |
8355 | memmove(p + hi + 1, p + hi, | |
8356 | (bb->count - hi) * 8); | |
8357 | bb->count++; | |
8358 | ||
8359 | if (this_sectors > BB_MAX_LEN) | |
8360 | this_sectors = BB_MAX_LEN; | |
8361 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8362 | sectors -= this_sectors; | |
8363 | s += this_sectors; | |
8364 | } | |
8365 | } | |
8366 | ||
8367 | bb->changed = 1; | |
de393cde N |
8368 | if (!acknowledged) |
8369 | bb->unacked_exist = 1; | |
905b0297 | 8370 | write_sequnlock_irqrestore(&bb->lock, flags); |
2230dfe4 N |
8371 | |
8372 | return rv; | |
8373 | } | |
8374 | ||
3cb03002 | 8375 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8376 | int is_new) |
2230dfe4 | 8377 | { |
c6563a8c N |
8378 | int rv; |
8379 | if (is_new) | |
8380 | s += rdev->new_data_offset; | |
8381 | else | |
8382 | s += rdev->data_offset; | |
8383 | rv = md_set_badblocks(&rdev->badblocks, | |
8384 | s, sectors, 0); | |
2230dfe4 N |
8385 | if (rv) { |
8386 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8387 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 N |
8388 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
8389 | md_wakeup_thread(rdev->mddev->thread); | |
8390 | } | |
8391 | return rv; | |
8392 | } | |
8393 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8394 | ||
8395 | /* | |
8396 | * Remove a range of bad blocks from the table. | |
8397 | * This may involve extending the table if we spilt a region, | |
8398 | * but it must not fail. So if the table becomes full, we just | |
8399 | * drop the remove request. | |
8400 | */ | |
8401 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8402 | { | |
8403 | u64 *p; | |
8404 | int lo, hi; | |
8405 | sector_t target = s + sectors; | |
8406 | int rv = 0; | |
8407 | ||
8408 | if (bb->shift > 0) { | |
8409 | /* When clearing we round the start up and the end down. | |
8410 | * This should not matter as the shift should align with | |
8411 | * the block size and no rounding should ever be needed. | |
8412 | * However it is better the think a block is bad when it | |
8413 | * isn't than to think a block is not bad when it is. | |
8414 | */ | |
8415 | s += (1<<bb->shift) - 1; | |
8416 | s >>= bb->shift; | |
8417 | target >>= bb->shift; | |
8418 | sectors = target - s; | |
8419 | } | |
8420 | ||
8421 | write_seqlock_irq(&bb->lock); | |
8422 | ||
8423 | p = bb->page; | |
8424 | lo = 0; | |
8425 | hi = bb->count; | |
8426 | /* Find the last range that starts before 'target' */ | |
8427 | while (hi - lo > 1) { | |
8428 | int mid = (lo + hi) / 2; | |
8429 | sector_t a = BB_OFFSET(p[mid]); | |
8430 | if (a < target) | |
8431 | lo = mid; | |
8432 | else | |
8433 | hi = mid; | |
8434 | } | |
8435 | if (hi > lo) { | |
8436 | /* p[lo] is the last range that could overlap the | |
8437 | * current range. Earlier ranges could also overlap, | |
8438 | * but only this one can overlap the end of the range. | |
8439 | */ | |
8440 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8441 | /* Partial overlap, leave the tail of this range */ | |
8442 | int ack = BB_ACK(p[lo]); | |
8443 | sector_t a = BB_OFFSET(p[lo]); | |
8444 | sector_t end = a + BB_LEN(p[lo]); | |
8445 | ||
8446 | if (a < s) { | |
8447 | /* we need to split this range */ | |
8448 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8b32bf5e | 8449 | rv = -ENOSPC; |
2230dfe4 N |
8450 | goto out; |
8451 | } | |
8452 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8453 | bb->count++; | |
8454 | p[lo] = BB_MAKE(a, s-a, ack); | |
8455 | lo++; | |
8456 | } | |
8457 | p[lo] = BB_MAKE(target, end - target, ack); | |
8458 | /* there is no longer an overlap */ | |
8459 | hi = lo; | |
8460 | lo--; | |
8461 | } | |
8462 | while (lo >= 0 && | |
8463 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8464 | /* This range does overlap */ | |
8465 | if (BB_OFFSET(p[lo]) < s) { | |
8466 | /* Keep the early parts of this range. */ | |
8467 | int ack = BB_ACK(p[lo]); | |
8468 | sector_t start = BB_OFFSET(p[lo]); | |
8469 | p[lo] = BB_MAKE(start, s - start, ack); | |
8470 | /* now low doesn't overlap, so.. */ | |
8471 | break; | |
8472 | } | |
8473 | lo--; | |
8474 | } | |
8475 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8476 | * anything between needs to be discarded | |
8477 | */ | |
8478 | if (hi - lo > 1) { | |
8479 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8480 | bb->count -= (hi - lo - 1); | |
8481 | } | |
8482 | } | |
8483 | ||
8484 | bb->changed = 1; | |
8485 | out: | |
8486 | write_sequnlock_irq(&bb->lock); | |
8487 | return rv; | |
8488 | } | |
8489 | ||
c6563a8c N |
8490 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8491 | int is_new) | |
2230dfe4 | 8492 | { |
c6563a8c N |
8493 | if (is_new) |
8494 | s += rdev->new_data_offset; | |
8495 | else | |
8496 | s += rdev->data_offset; | |
2230dfe4 | 8497 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8498 | s, sectors); |
2230dfe4 N |
8499 | } |
8500 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8501 | ||
8502 | /* | |
8503 | * Acknowledge all bad blocks in a list. | |
8504 | * This only succeeds if ->changed is clear. It is used by | |
8505 | * in-kernel metadata updates | |
8506 | */ | |
8507 | void md_ack_all_badblocks(struct badblocks *bb) | |
8508 | { | |
8509 | if (bb->page == NULL || bb->changed) | |
8510 | /* no point even trying */ | |
8511 | return; | |
8512 | write_seqlock_irq(&bb->lock); | |
8513 | ||
ecb178bb | 8514 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8515 | u64 *p = bb->page; |
8516 | int i; | |
8517 | for (i = 0; i < bb->count ; i++) { | |
8518 | if (!BB_ACK(p[i])) { | |
8519 | sector_t start = BB_OFFSET(p[i]); | |
8520 | int len = BB_LEN(p[i]); | |
8521 | p[i] = BB_MAKE(start, len, 1); | |
8522 | } | |
8523 | } | |
de393cde | 8524 | bb->unacked_exist = 0; |
2230dfe4 N |
8525 | } |
8526 | write_sequnlock_irq(&bb->lock); | |
8527 | } | |
8528 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8529 | ||
16c791a5 N |
8530 | /* sysfs access to bad-blocks list. |
8531 | * We present two files. | |
8532 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8533 | * are recorded as bad. The list is truncated to fit within | |
8534 | * the one-page limit of sysfs. | |
8535 | * Writing "sector length" to this file adds an acknowledged | |
8536 | * bad block list. | |
8537 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8538 | * been acknowledged. Writing to this file adds bad blocks | |
8539 | * without acknowledging them. This is largely for testing. | |
8540 | */ | |
8541 | ||
8542 | static ssize_t | |
8543 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8544 | { | |
8545 | size_t len; | |
8546 | int i; | |
8547 | u64 *p = bb->page; | |
8548 | unsigned seq; | |
8549 | ||
8550 | if (bb->shift < 0) | |
8551 | return 0; | |
8552 | ||
8553 | retry: | |
8554 | seq = read_seqbegin(&bb->lock); | |
8555 | ||
8556 | len = 0; | |
8557 | i = 0; | |
8558 | ||
8559 | while (len < PAGE_SIZE && i < bb->count) { | |
8560 | sector_t s = BB_OFFSET(p[i]); | |
8561 | unsigned int length = BB_LEN(p[i]); | |
8562 | int ack = BB_ACK(p[i]); | |
8563 | i++; | |
8564 | ||
8565 | if (unack && ack) | |
8566 | continue; | |
8567 | ||
8568 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8569 | (unsigned long long)s << bb->shift, | |
8570 | length << bb->shift); | |
8571 | } | |
de393cde N |
8572 | if (unack && len == 0) |
8573 | bb->unacked_exist = 0; | |
16c791a5 N |
8574 | |
8575 | if (read_seqretry(&bb->lock, seq)) | |
8576 | goto retry; | |
8577 | ||
8578 | return len; | |
8579 | } | |
8580 | ||
8581 | #define DO_DEBUG 1 | |
8582 | ||
8583 | static ssize_t | |
8584 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8585 | { | |
8586 | unsigned long long sector; | |
8587 | int length; | |
8588 | char newline; | |
8589 | #ifdef DO_DEBUG | |
8590 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8591 | * Normally only a successful write may clear a badblock | |
8592 | */ | |
8593 | int clear = 0; | |
8594 | if (page[0] == '-') { | |
8595 | clear = 1; | |
8596 | page++; | |
8597 | } | |
8598 | #endif /* DO_DEBUG */ | |
8599 | ||
8600 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8601 | case 3: | |
8602 | if (newline != '\n') | |
8603 | return -EINVAL; | |
8604 | case 2: | |
8605 | if (length <= 0) | |
8606 | return -EINVAL; | |
8607 | break; | |
8608 | default: | |
8609 | return -EINVAL; | |
8610 | } | |
8611 | ||
8612 | #ifdef DO_DEBUG | |
8613 | if (clear) { | |
8614 | md_clear_badblocks(bb, sector, length); | |
8615 | return len; | |
8616 | } | |
8617 | #endif /* DO_DEBUG */ | |
8618 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8619 | return len; | |
8620 | else | |
8621 | return -ENOSPC; | |
8622 | } | |
8623 | ||
75c96f85 AB |
8624 | static int md_notify_reboot(struct notifier_block *this, |
8625 | unsigned long code, void *x) | |
1da177e4 LT |
8626 | { |
8627 | struct list_head *tmp; | |
fd01b88c | 8628 | struct mddev *mddev; |
2dba6a91 | 8629 | int need_delay = 0; |
1da177e4 | 8630 | |
c744a65c N |
8631 | for_each_mddev(mddev, tmp) { |
8632 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8633 | if (mddev->pers) |
8634 | __md_stop_writes(mddev); | |
0f62fb22 N |
8635 | if (mddev->persistent) |
8636 | mddev->safemode = 2; | |
c744a65c | 8637 | mddev_unlock(mddev); |
2dba6a91 | 8638 | } |
c744a65c | 8639 | need_delay = 1; |
1da177e4 | 8640 | } |
c744a65c N |
8641 | /* |
8642 | * certain more exotic SCSI devices are known to be | |
8643 | * volatile wrt too early system reboots. While the | |
8644 | * right place to handle this issue is the given | |
8645 | * driver, we do want to have a safe RAID driver ... | |
8646 | */ | |
8647 | if (need_delay) | |
8648 | mdelay(1000*1); | |
8649 | ||
1da177e4 LT |
8650 | return NOTIFY_DONE; |
8651 | } | |
8652 | ||
75c96f85 | 8653 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8654 | .notifier_call = md_notify_reboot, |
8655 | .next = NULL, | |
8656 | .priority = INT_MAX, /* before any real devices */ | |
8657 | }; | |
8658 | ||
8659 | static void md_geninit(void) | |
8660 | { | |
36a4e1fe | 8661 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8662 | |
c7705f34 | 8663 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8664 | } |
8665 | ||
75c96f85 | 8666 | static int __init md_init(void) |
1da177e4 | 8667 | { |
e804ac78 TH |
8668 | int ret = -ENOMEM; |
8669 | ||
ada609ee | 8670 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8671 | if (!md_wq) |
8672 | goto err_wq; | |
8673 | ||
8674 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8675 | if (!md_misc_wq) | |
8676 | goto err_misc_wq; | |
8677 | ||
8678 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8679 | goto err_md; | |
8680 | ||
8681 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8682 | goto err_mdp; | |
8683 | mdp_major = ret; | |
8684 | ||
af5628f0 | 8685 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
8686 | md_probe, NULL, NULL); |
8687 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8688 | md_probe, NULL, NULL); |
8689 | ||
1da177e4 | 8690 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8691 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8692 | |
8693 | md_geninit(); | |
d710e138 | 8694 | return 0; |
1da177e4 | 8695 | |
e804ac78 TH |
8696 | err_mdp: |
8697 | unregister_blkdev(MD_MAJOR, "md"); | |
8698 | err_md: | |
8699 | destroy_workqueue(md_misc_wq); | |
8700 | err_misc_wq: | |
8701 | destroy_workqueue(md_wq); | |
8702 | err_wq: | |
8703 | return ret; | |
8704 | } | |
1da177e4 LT |
8705 | |
8706 | #ifndef MODULE | |
8707 | ||
8708 | /* | |
8709 | * Searches all registered partitions for autorun RAID arrays | |
8710 | * at boot time. | |
8711 | */ | |
4d936ec1 ME |
8712 | |
8713 | static LIST_HEAD(all_detected_devices); | |
8714 | struct detected_devices_node { | |
8715 | struct list_head list; | |
8716 | dev_t dev; | |
8717 | }; | |
1da177e4 LT |
8718 | |
8719 | void md_autodetect_dev(dev_t dev) | |
8720 | { | |
4d936ec1 ME |
8721 | struct detected_devices_node *node_detected_dev; |
8722 | ||
8723 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8724 | if (node_detected_dev) { | |
8725 | node_detected_dev->dev = dev; | |
8726 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8727 | } else { | |
8728 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8729 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8730 | } | |
1da177e4 LT |
8731 | } |
8732 | ||
1da177e4 LT |
8733 | static void autostart_arrays(int part) |
8734 | { | |
3cb03002 | 8735 | struct md_rdev *rdev; |
4d936ec1 ME |
8736 | struct detected_devices_node *node_detected_dev; |
8737 | dev_t dev; | |
8738 | int i_scanned, i_passed; | |
1da177e4 | 8739 | |
4d936ec1 ME |
8740 | i_scanned = 0; |
8741 | i_passed = 0; | |
1da177e4 | 8742 | |
4d936ec1 | 8743 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8744 | |
4d936ec1 ME |
8745 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8746 | i_scanned++; | |
8747 | node_detected_dev = list_entry(all_detected_devices.next, | |
8748 | struct detected_devices_node, list); | |
8749 | list_del(&node_detected_dev->list); | |
8750 | dev = node_detected_dev->dev; | |
8751 | kfree(node_detected_dev); | |
df968c4e | 8752 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8753 | if (IS_ERR(rdev)) |
8754 | continue; | |
8755 | ||
403df478 | 8756 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 8757 | continue; |
403df478 | 8758 | |
d0fae18f | 8759 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8760 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8761 | i_passed++; |
1da177e4 | 8762 | } |
4d936ec1 ME |
8763 | |
8764 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8765 | i_scanned, i_passed); | |
1da177e4 LT |
8766 | |
8767 | autorun_devices(part); | |
8768 | } | |
8769 | ||
fdee8ae4 | 8770 | #endif /* !MODULE */ |
1da177e4 LT |
8771 | |
8772 | static __exit void md_exit(void) | |
8773 | { | |
fd01b88c | 8774 | struct mddev *mddev; |
1da177e4 | 8775 | struct list_head *tmp; |
e2f23b60 | 8776 | int delay = 1; |
8ab5e4c1 | 8777 | |
af5628f0 | 8778 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 8779 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8780 | |
3dbd8c2e | 8781 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8782 | unregister_blkdev(mdp_major, "mdp"); |
8783 | unregister_reboot_notifier(&md_notifier); | |
8784 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
8785 | |
8786 | /* We cannot unload the modules while some process is | |
8787 | * waiting for us in select() or poll() - wake them up | |
8788 | */ | |
8789 | md_unloading = 1; | |
8790 | while (waitqueue_active(&md_event_waiters)) { | |
8791 | /* not safe to leave yet */ | |
8792 | wake_up(&md_event_waiters); | |
8793 | msleep(delay); | |
8794 | delay += delay; | |
8795 | } | |
1da177e4 | 8796 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 8797 | |
29ac4aa3 | 8798 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8799 | export_array(mddev); |
d3374825 | 8800 | mddev->hold_active = 0; |
1da177e4 | 8801 | } |
e804ac78 TH |
8802 | destroy_workqueue(md_misc_wq); |
8803 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8804 | } |
8805 | ||
685784aa | 8806 | subsys_initcall(md_init); |
1da177e4 LT |
8807 | module_exit(md_exit) |
8808 | ||
f91de92e N |
8809 | static int get_ro(char *buffer, struct kernel_param *kp) |
8810 | { | |
8811 | return sprintf(buffer, "%d", start_readonly); | |
8812 | } | |
8813 | static int set_ro(const char *val, struct kernel_param *kp) | |
8814 | { | |
8815 | char *e; | |
8816 | int num = simple_strtoul(val, &e, 10); | |
8817 | if (*val && (*e == '\0' || *e == '\n')) { | |
8818 | start_readonly = num; | |
4dbcdc75 | 8819 | return 0; |
f91de92e N |
8820 | } |
8821 | return -EINVAL; | |
8822 | } | |
8823 | ||
80ca3a44 N |
8824 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8825 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 8826 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8827 | |
1da177e4 | 8828 | MODULE_LICENSE("GPL"); |
0efb9e61 | 8829 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8830 | MODULE_ALIAS("md"); |
72008652 | 8831 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |