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" |
1da177e4 | 56 | |
1da177e4 | 57 | #ifndef MODULE |
d710e138 | 58 | static void autostart_arrays(int part); |
1da177e4 LT |
59 | #endif |
60 | ||
01f96c0a N |
61 | /* pers_list is a list of registered personalities protected |
62 | * by pers_lock. | |
63 | * pers_lock does extra service to protect accesses to | |
64 | * mddev->thread when the mutex cannot be held. | |
65 | */ | |
2604b703 | 66 | static LIST_HEAD(pers_list); |
1da177e4 LT |
67 | static DEFINE_SPINLOCK(pers_lock); |
68 | ||
90b08710 | 69 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
70 | static struct workqueue_struct *md_wq; |
71 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 72 | |
746d3207 N |
73 | static int remove_and_add_spares(struct mddev *mddev, |
74 | struct md_rdev *this); | |
5aa61f42 | 75 | static void mddev_detach(struct mddev *mddev); |
746d3207 | 76 | |
1e50915f RB |
77 | /* |
78 | * Default number of read corrections we'll attempt on an rdev | |
79 | * before ejecting it from the array. We divide the read error | |
80 | * count by 2 for every hour elapsed between read errors. | |
81 | */ | |
82 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
83 | /* |
84 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
85 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
86 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 87 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
88 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
89 | * speed limit - in case reconstruction slows down your system despite | |
90 | * idle IO detection. | |
91 | * | |
92 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 93 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
94 | */ |
95 | ||
96 | static int sysctl_speed_limit_min = 1000; | |
97 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 98 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
99 | { |
100 | return mddev->sync_speed_min ? | |
101 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
102 | } | |
103 | ||
fd01b88c | 104 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
105 | { |
106 | return mddev->sync_speed_max ? | |
107 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
108 | } | |
1da177e4 LT |
109 | |
110 | static struct ctl_table_header *raid_table_header; | |
111 | ||
82592c38 | 112 | static struct ctl_table raid_table[] = { |
1da177e4 | 113 | { |
1da177e4 LT |
114 | .procname = "speed_limit_min", |
115 | .data = &sysctl_speed_limit_min, | |
116 | .maxlen = sizeof(int), | |
80ca3a44 | 117 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 118 | .proc_handler = proc_dointvec, |
1da177e4 LT |
119 | }, |
120 | { | |
1da177e4 LT |
121 | .procname = "speed_limit_max", |
122 | .data = &sysctl_speed_limit_max, | |
123 | .maxlen = sizeof(int), | |
80ca3a44 | 124 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 125 | .proc_handler = proc_dointvec, |
1da177e4 | 126 | }, |
894d2491 | 127 | { } |
1da177e4 LT |
128 | }; |
129 | ||
82592c38 | 130 | static struct ctl_table raid_dir_table[] = { |
1da177e4 | 131 | { |
1da177e4 LT |
132 | .procname = "raid", |
133 | .maxlen = 0, | |
80ca3a44 | 134 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
135 | .child = raid_table, |
136 | }, | |
894d2491 | 137 | { } |
1da177e4 LT |
138 | }; |
139 | ||
82592c38 | 140 | static struct ctl_table raid_root_table[] = { |
1da177e4 | 141 | { |
1da177e4 LT |
142 | .procname = "dev", |
143 | .maxlen = 0, | |
144 | .mode = 0555, | |
145 | .child = raid_dir_table, | |
146 | }, | |
894d2491 | 147 | { } |
1da177e4 LT |
148 | }; |
149 | ||
83d5cde4 | 150 | static const struct block_device_operations md_fops; |
1da177e4 | 151 | |
f91de92e N |
152 | static int start_readonly; |
153 | ||
a167f663 N |
154 | /* bio_clone_mddev |
155 | * like bio_clone, but with a local bio set | |
156 | */ | |
157 | ||
a167f663 | 158 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 159 | struct mddev *mddev) |
a167f663 N |
160 | { |
161 | struct bio *b; | |
a167f663 N |
162 | |
163 | if (!mddev || !mddev->bio_set) | |
164 | return bio_alloc(gfp_mask, nr_iovecs); | |
165 | ||
395c72a7 | 166 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
167 | if (!b) |
168 | return NULL; | |
a167f663 N |
169 | return b; |
170 | } | |
171 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
172 | ||
173 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 174 | struct mddev *mddev) |
a167f663 | 175 | { |
a167f663 N |
176 | if (!mddev || !mddev->bio_set) |
177 | return bio_clone(bio, gfp_mask); | |
178 | ||
bf800ef1 | 179 | return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
a167f663 N |
180 | } |
181 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
182 | ||
d7603b7e N |
183 | /* |
184 | * We have a system wide 'event count' that is incremented | |
185 | * on any 'interesting' event, and readers of /proc/mdstat | |
186 | * can use 'poll' or 'select' to find out when the event | |
187 | * count increases. | |
188 | * | |
189 | * Events are: | |
190 | * start array, stop array, error, add device, remove device, | |
191 | * start build, activate spare | |
192 | */ | |
2989ddbd | 193 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 194 | static atomic_t md_event_count; |
fd01b88c | 195 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
196 | { |
197 | atomic_inc(&md_event_count); | |
198 | wake_up(&md_event_waiters); | |
199 | } | |
29269553 | 200 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 201 | |
c331eb04 N |
202 | /* Alternate version that can be called from interrupts |
203 | * when calling sysfs_notify isn't needed. | |
204 | */ | |
fd01b88c | 205 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
206 | { |
207 | atomic_inc(&md_event_count); | |
208 | wake_up(&md_event_waiters); | |
209 | } | |
210 | ||
1da177e4 LT |
211 | /* |
212 | * Enables to iterate over all existing md arrays | |
213 | * all_mddevs_lock protects this list. | |
214 | */ | |
215 | static LIST_HEAD(all_mddevs); | |
216 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
217 | ||
1da177e4 LT |
218 | /* |
219 | * iterates through all used mddevs in the system. | |
220 | * We take care to grab the all_mddevs_lock whenever navigating | |
221 | * the list, and to always hold a refcount when unlocked. | |
222 | * Any code which breaks out of this loop while own | |
223 | * a reference to the current mddev and must mddev_put it. | |
224 | */ | |
fd01b88c | 225 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 | 226 | \ |
f72ffdd6 | 227 | for (({ spin_lock(&all_mddevs_lock); \ |
fd01b88c N |
228 | _tmp = all_mddevs.next; \ |
229 | _mddev = NULL;}); \ | |
230 | ({ if (_tmp != &all_mddevs) \ | |
231 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 232 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
233 | if (_mddev) mddev_put(_mddev); \ |
234 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
235 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 236 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 237 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
238 | ) |
239 | ||
409c57f3 N |
240 | /* Rather than calling directly into the personality make_request function, |
241 | * IO requests come here first so that we can check if the device is | |
242 | * being suspended pending a reconfiguration. | |
243 | * We hold a refcount over the call to ->make_request. By the time that | |
244 | * call has finished, the bio has been linked into some internal structure | |
245 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
246 | */ | |
5a7bbad2 | 247 | static void md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 248 | { |
49077326 | 249 | const int rw = bio_data_dir(bio); |
fd01b88c | 250 | struct mddev *mddev = q->queuedata; |
e91ece55 | 251 | unsigned int sectors; |
49077326 | 252 | |
0ca69886 N |
253 | if (mddev == NULL || mddev->pers == NULL |
254 | || !mddev->ready) { | |
409c57f3 | 255 | bio_io_error(bio); |
5a7bbad2 | 256 | return; |
409c57f3 | 257 | } |
bbfa57c0 SR |
258 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
259 | bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS); | |
260 | return; | |
261 | } | |
0ca69886 | 262 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 263 | rcu_read_lock(); |
e9c7469b | 264 | if (mddev->suspended) { |
409c57f3 N |
265 | DEFINE_WAIT(__wait); |
266 | for (;;) { | |
267 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
268 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 269 | if (!mddev->suspended) |
409c57f3 N |
270 | break; |
271 | rcu_read_unlock(); | |
272 | schedule(); | |
273 | rcu_read_lock(); | |
274 | } | |
275 | finish_wait(&mddev->sb_wait, &__wait); | |
276 | } | |
277 | atomic_inc(&mddev->active_io); | |
278 | rcu_read_unlock(); | |
49077326 | 279 | |
e91ece55 CM |
280 | /* |
281 | * save the sectors now since our bio can | |
282 | * go away inside make_request | |
283 | */ | |
284 | sectors = bio_sectors(bio); | |
5a7bbad2 | 285 | mddev->pers->make_request(mddev, bio); |
49077326 | 286 | |
18c0b223 | 287 | generic_start_io_acct(rw, sectors, &mddev->gendisk->part0); |
49077326 | 288 | |
409c57f3 N |
289 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
290 | wake_up(&mddev->sb_wait); | |
409c57f3 N |
291 | } |
292 | ||
9e35b99c N |
293 | /* mddev_suspend makes sure no new requests are submitted |
294 | * to the device, and that any requests that have been submitted | |
295 | * are completely handled. | |
afa0f557 N |
296 | * Once mddev_detach() is called and completes, the module will be |
297 | * completely unused. | |
9e35b99c | 298 | */ |
fd01b88c | 299 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
300 | { |
301 | BUG_ON(mddev->suspended); | |
302 | mddev->suspended = 1; | |
303 | synchronize_rcu(); | |
304 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
305 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
306 | |
307 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 308 | } |
390ee602 | 309 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 310 | |
fd01b88c | 311 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
312 | { |
313 | mddev->suspended = 0; | |
314 | wake_up(&mddev->sb_wait); | |
315 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 316 | |
47525e59 | 317 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
318 | md_wakeup_thread(mddev->thread); |
319 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 320 | } |
390ee602 | 321 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 322 | |
fd01b88c | 323 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 | 324 | { |
5c675f83 N |
325 | struct md_personality *pers = mddev->pers; |
326 | int ret = 0; | |
327 | ||
328 | rcu_read_lock(); | |
329 | if (mddev->suspended) | |
330 | ret = 1; | |
331 | else if (pers && pers->congested) | |
332 | ret = pers->congested(mddev, bits); | |
333 | rcu_read_unlock(); | |
334 | return ret; | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(mddev_congested); | |
337 | static int md_congested(void *data, int bits) | |
338 | { | |
339 | struct mddev *mddev = data; | |
340 | return mddev_congested(mddev, bits); | |
3fa841d7 | 341 | } |
3fa841d7 | 342 | |
64590f45 N |
343 | static int md_mergeable_bvec(struct request_queue *q, |
344 | struct bvec_merge_data *bvm, | |
345 | struct bio_vec *biovec) | |
346 | { | |
347 | struct mddev *mddev = q->queuedata; | |
348 | int ret; | |
349 | rcu_read_lock(); | |
350 | if (mddev->suspended) { | |
351 | /* Must always allow one vec */ | |
352 | if (bvm->bi_size == 0) | |
353 | ret = biovec->bv_len; | |
354 | else | |
355 | ret = 0; | |
356 | } else { | |
357 | struct md_personality *pers = mddev->pers; | |
358 | if (pers && pers->mergeable_bvec) | |
359 | ret = pers->mergeable_bvec(mddev, bvm, biovec); | |
360 | else | |
361 | ret = biovec->bv_len; | |
362 | } | |
363 | rcu_read_unlock(); | |
364 | return ret; | |
365 | } | |
a2826aa9 | 366 | /* |
e9c7469b | 367 | * Generic flush handling for md |
a2826aa9 N |
368 | */ |
369 | ||
e9c7469b | 370 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 | 371 | { |
3cb03002 | 372 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 373 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
374 | |
375 | rdev_dec_pending(rdev, mddev); | |
376 | ||
377 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 378 | /* The pre-request flush has finished */ |
e804ac78 | 379 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
380 | } |
381 | bio_put(bio); | |
382 | } | |
383 | ||
a7a07e69 N |
384 | static void md_submit_flush_data(struct work_struct *ws); |
385 | ||
a035fc3e | 386 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 387 | { |
fd01b88c | 388 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 389 | struct md_rdev *rdev; |
a2826aa9 | 390 | |
a7a07e69 N |
391 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
392 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 393 | rcu_read_lock(); |
dafb20fa | 394 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
395 | if (rdev->raid_disk >= 0 && |
396 | !test_bit(Faulty, &rdev->flags)) { | |
397 | /* Take two references, one is dropped | |
398 | * when request finishes, one after | |
399 | * we reclaim rcu_read_lock | |
400 | */ | |
401 | struct bio *bi; | |
402 | atomic_inc(&rdev->nr_pending); | |
403 | atomic_inc(&rdev->nr_pending); | |
404 | rcu_read_unlock(); | |
b5e1b8ce | 405 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 406 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
407 | bi->bi_private = rdev; |
408 | bi->bi_bdev = rdev->bdev; | |
409 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 410 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
411 | rcu_read_lock(); |
412 | rdev_dec_pending(rdev, mddev); | |
413 | } | |
414 | rcu_read_unlock(); | |
a7a07e69 N |
415 | if (atomic_dec_and_test(&mddev->flush_pending)) |
416 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
417 | } |
418 | ||
e9c7469b | 419 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 420 | { |
fd01b88c | 421 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 422 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 423 | |
4f024f37 | 424 | if (bio->bi_iter.bi_size == 0) |
a2826aa9 N |
425 | /* an empty barrier - all done */ |
426 | bio_endio(bio, 0); | |
427 | else { | |
e9c7469b | 428 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 429 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 430 | } |
2b74e12e N |
431 | |
432 | mddev->flush_bio = NULL; | |
433 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
434 | } |
435 | ||
fd01b88c | 436 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 | 437 | { |
85572d7c | 438 | spin_lock_irq(&mddev->lock); |
a2826aa9 | 439 | wait_event_lock_irq(mddev->sb_wait, |
e9c7469b | 440 | !mddev->flush_bio, |
85572d7c | 441 | mddev->lock); |
e9c7469b | 442 | mddev->flush_bio = bio; |
85572d7c | 443 | spin_unlock_irq(&mddev->lock); |
a2826aa9 | 444 | |
a035fc3e N |
445 | INIT_WORK(&mddev->flush_work, submit_flushes); |
446 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 447 | } |
e9c7469b | 448 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 449 | |
74018dc3 | 450 | void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
97658cdd | 451 | { |
9cbb1750 N |
452 | struct mddev *mddev = cb->data; |
453 | md_wakeup_thread(mddev->thread); | |
454 | kfree(cb); | |
97658cdd | 455 | } |
9cbb1750 | 456 | EXPORT_SYMBOL(md_unplug); |
2ac87401 | 457 | |
fd01b88c | 458 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
459 | { |
460 | atomic_inc(&mddev->active); | |
461 | return mddev; | |
462 | } | |
463 | ||
5fd3a17e | 464 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 465 | |
fd01b88c | 466 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 467 | { |
a167f663 N |
468 | struct bio_set *bs = NULL; |
469 | ||
1da177e4 LT |
470 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
471 | return; | |
d3374825 | 472 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
473 | mddev->ctime == 0 && !mddev->hold_active) { |
474 | /* Array is not configured at all, and not held active, | |
475 | * so destroy it */ | |
af8a2434 | 476 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
477 | bs = mddev->bio_set; |
478 | mddev->bio_set = NULL; | |
d3374825 | 479 | if (mddev->gendisk) { |
e804ac78 TH |
480 | /* We did a probe so need to clean up. Call |
481 | * queue_work inside the spinlock so that | |
482 | * flush_workqueue() after mddev_find will | |
483 | * succeed in waiting for the work to be done. | |
d3374825 N |
484 | */ |
485 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 486 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
487 | } else |
488 | kfree(mddev); | |
489 | } | |
490 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
491 | if (bs) |
492 | bioset_free(bs); | |
1da177e4 LT |
493 | } |
494 | ||
fd01b88c | 495 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
496 | { |
497 | mutex_init(&mddev->open_mutex); | |
498 | mutex_init(&mddev->reconfig_mutex); | |
499 | mutex_init(&mddev->bitmap_info.mutex); | |
500 | INIT_LIST_HEAD(&mddev->disks); | |
501 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
502 | init_timer(&mddev->safemode_timer); | |
503 | atomic_set(&mddev->active, 1); | |
504 | atomic_set(&mddev->openers, 0); | |
505 | atomic_set(&mddev->active_io, 0); | |
85572d7c | 506 | spin_lock_init(&mddev->lock); |
fafd7fb0 N |
507 | atomic_set(&mddev->flush_pending, 0); |
508 | init_waitqueue_head(&mddev->sb_wait); | |
509 | init_waitqueue_head(&mddev->recovery_wait); | |
510 | mddev->reshape_position = MaxSector; | |
2c810cdd | 511 | mddev->reshape_backwards = 0; |
c4a39551 | 512 | mddev->last_sync_action = "none"; |
fafd7fb0 N |
513 | mddev->resync_min = 0; |
514 | mddev->resync_max = MaxSector; | |
515 | mddev->level = LEVEL_NONE; | |
516 | } | |
390ee602 | 517 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 518 | |
f72ffdd6 | 519 | static struct mddev *mddev_find(dev_t unit) |
1da177e4 | 520 | { |
fd01b88c | 521 | struct mddev *mddev, *new = NULL; |
1da177e4 | 522 | |
8f5f02c4 N |
523 | if (unit && MAJOR(unit) != MD_MAJOR) |
524 | unit &= ~((1<<MdpMinorShift)-1); | |
525 | ||
1da177e4 LT |
526 | retry: |
527 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
528 | |
529 | if (unit) { | |
530 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
531 | if (mddev->unit == unit) { | |
532 | mddev_get(mddev); | |
533 | spin_unlock(&all_mddevs_lock); | |
534 | kfree(new); | |
535 | return mddev; | |
536 | } | |
537 | ||
538 | if (new) { | |
539 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 540 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
541 | new->hold_active = UNTIL_IOCTL; |
542 | return new; | |
1da177e4 | 543 | } |
efeb53c0 N |
544 | } else if (new) { |
545 | /* find an unused unit number */ | |
546 | static int next_minor = 512; | |
547 | int start = next_minor; | |
548 | int is_free = 0; | |
549 | int dev = 0; | |
550 | while (!is_free) { | |
551 | dev = MKDEV(MD_MAJOR, next_minor); | |
552 | next_minor++; | |
553 | if (next_minor > MINORMASK) | |
554 | next_minor = 0; | |
555 | if (next_minor == start) { | |
556 | /* Oh dear, all in use. */ | |
557 | spin_unlock(&all_mddevs_lock); | |
558 | kfree(new); | |
559 | return NULL; | |
560 | } | |
f72ffdd6 | 561 | |
efeb53c0 N |
562 | is_free = 1; |
563 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
564 | if (mddev->unit == dev) { | |
565 | is_free = 0; | |
566 | break; | |
567 | } | |
568 | } | |
569 | new->unit = dev; | |
570 | new->md_minor = MINOR(dev); | |
571 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
572 | list_add(&new->all_mddevs, &all_mddevs); |
573 | spin_unlock(&all_mddevs_lock); | |
574 | return new; | |
575 | } | |
576 | spin_unlock(&all_mddevs_lock); | |
577 | ||
9ffae0cf | 578 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
579 | if (!new) |
580 | return NULL; | |
581 | ||
1da177e4 LT |
582 | new->unit = unit; |
583 | if (MAJOR(unit) == MD_MAJOR) | |
584 | new->md_minor = MINOR(unit); | |
585 | else | |
586 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
587 | ||
fafd7fb0 | 588 | mddev_init(new); |
1da177e4 | 589 | |
1da177e4 LT |
590 | goto retry; |
591 | } | |
592 | ||
f72ffdd6 | 593 | static inline int __must_check mddev_lock(struct mddev *mddev) |
1da177e4 | 594 | { |
df5b89b3 | 595 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
596 | } |
597 | ||
29f097c4 N |
598 | /* Sometimes we need to take the lock in a situation where |
599 | * failure due to interrupts is not acceptable. | |
600 | */ | |
f72ffdd6 | 601 | static inline void mddev_lock_nointr(struct mddev *mddev) |
29f097c4 N |
602 | { |
603 | mutex_lock(&mddev->reconfig_mutex); | |
604 | } | |
605 | ||
fd01b88c | 606 | static inline int mddev_is_locked(struct mddev *mddev) |
b522adcd DW |
607 | { |
608 | return mutex_is_locked(&mddev->reconfig_mutex); | |
609 | } | |
610 | ||
f72ffdd6 | 611 | static inline int mddev_trylock(struct mddev *mddev) |
1da177e4 | 612 | { |
df5b89b3 | 613 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
614 | } |
615 | ||
b6eb127d N |
616 | static struct attribute_group md_redundancy_group; |
617 | ||
f72ffdd6 | 618 | static void mddev_unlock(struct mddev *mddev) |
1da177e4 | 619 | { |
a64c876f | 620 | if (mddev->to_remove) { |
b6eb127d N |
621 | /* These cannot be removed under reconfig_mutex as |
622 | * an access to the files will try to take reconfig_mutex | |
623 | * while holding the file unremovable, which leads to | |
624 | * a deadlock. | |
bb4f1e9d N |
625 | * So hold set sysfs_active while the remove in happeing, |
626 | * and anything else which might set ->to_remove or my | |
627 | * otherwise change the sysfs namespace will fail with | |
628 | * -EBUSY if sysfs_active is still set. | |
629 | * We set sysfs_active under reconfig_mutex and elsewhere | |
630 | * test it under the same mutex to ensure its correct value | |
631 | * is seen. | |
b6eb127d | 632 | */ |
a64c876f N |
633 | struct attribute_group *to_remove = mddev->to_remove; |
634 | mddev->to_remove = NULL; | |
bb4f1e9d | 635 | mddev->sysfs_active = 1; |
b6eb127d N |
636 | mutex_unlock(&mddev->reconfig_mutex); |
637 | ||
00bcb4ac N |
638 | if (mddev->kobj.sd) { |
639 | if (to_remove != &md_redundancy_group) | |
640 | sysfs_remove_group(&mddev->kobj, to_remove); | |
641 | if (mddev->pers == NULL || | |
642 | mddev->pers->sync_request == NULL) { | |
643 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
644 | if (mddev->sysfs_action) | |
645 | sysfs_put(mddev->sysfs_action); | |
646 | mddev->sysfs_action = NULL; | |
647 | } | |
a64c876f | 648 | } |
bb4f1e9d | 649 | mddev->sysfs_active = 0; |
b6eb127d N |
650 | } else |
651 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 652 | |
751e67ca CD |
653 | /* As we've dropped the mutex we need a spinlock to |
654 | * make sure the thread doesn't disappear | |
01f96c0a N |
655 | */ |
656 | spin_lock(&pers_lock); | |
005eca5e | 657 | md_wakeup_thread(mddev->thread); |
01f96c0a | 658 | spin_unlock(&pers_lock); |
1da177e4 LT |
659 | } |
660 | ||
1ca69c4b N |
661 | static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr) |
662 | { | |
663 | struct md_rdev *rdev; | |
664 | ||
665 | rdev_for_each_rcu(rdev, mddev) | |
666 | if (rdev->desc_nr == nr) | |
667 | return rdev; | |
668 | ||
669 | return NULL; | |
670 | } | |
671 | ||
672 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 673 | { |
3cb03002 | 674 | struct md_rdev *rdev; |
1da177e4 | 675 | |
dafb20fa | 676 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
677 | if (rdev->bdev->bd_dev == dev) |
678 | return rdev; | |
159ec1fc | 679 | |
1da177e4 LT |
680 | return NULL; |
681 | } | |
682 | ||
1ca69c4b N |
683 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
684 | { | |
685 | struct md_rdev *rdev; | |
686 | ||
687 | rdev_for_each_rcu(rdev, mddev) | |
688 | if (rdev->bdev->bd_dev == dev) | |
689 | return rdev; | |
690 | ||
691 | return NULL; | |
692 | } | |
693 | ||
84fc4b56 | 694 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 695 | { |
84fc4b56 | 696 | struct md_personality *pers; |
d9d166c2 N |
697 | list_for_each_entry(pers, &pers_list, list) { |
698 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 699 | return pers; |
d9d166c2 N |
700 | if (strcmp(pers->name, clevel)==0) |
701 | return pers; | |
702 | } | |
2604b703 N |
703 | return NULL; |
704 | } | |
705 | ||
b73df2d3 | 706 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 707 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 708 | { |
57b2caa3 | 709 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 710 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
711 | } |
712 | ||
f72ffdd6 | 713 | static int alloc_disk_sb(struct md_rdev *rdev) |
1da177e4 | 714 | { |
1da177e4 LT |
715 | rdev->sb_page = alloc_page(GFP_KERNEL); |
716 | if (!rdev->sb_page) { | |
717 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 718 | return -ENOMEM; |
1da177e4 LT |
719 | } |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
545c8795 | 724 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
725 | { |
726 | if (rdev->sb_page) { | |
2d1f3b5d | 727 | put_page(rdev->sb_page); |
1da177e4 LT |
728 | rdev->sb_loaded = 0; |
729 | rdev->sb_page = NULL; | |
0f420358 | 730 | rdev->sb_start = 0; |
dd8ac336 | 731 | rdev->sectors = 0; |
1da177e4 | 732 | } |
2699b672 N |
733 | if (rdev->bb_page) { |
734 | put_page(rdev->bb_page); | |
735 | rdev->bb_page = NULL; | |
736 | } | |
4fa2f327 N |
737 | kfree(rdev->badblocks.page); |
738 | rdev->badblocks.page = NULL; | |
1da177e4 | 739 | } |
545c8795 | 740 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 741 | |
6712ecf8 | 742 | static void super_written(struct bio *bio, int error) |
7bfa19f2 | 743 | { |
3cb03002 | 744 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 745 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 746 | |
3a0f5bbb N |
747 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
748 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
749 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
750 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 751 | md_error(mddev, rdev); |
3a0f5bbb | 752 | } |
7bfa19f2 | 753 | |
a9701a30 N |
754 | if (atomic_dec_and_test(&mddev->pending_writes)) |
755 | wake_up(&mddev->sb_wait); | |
f8b58edf | 756 | bio_put(bio); |
7bfa19f2 N |
757 | } |
758 | ||
fd01b88c | 759 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
760 | sector_t sector, int size, struct page *page) |
761 | { | |
762 | /* write first size bytes of page to sector of rdev | |
763 | * Increment mddev->pending_writes before returning | |
764 | * and decrement it on completion, waking up sb_wait | |
765 | * if zero is reached. | |
766 | * If an error occurred, call md_error | |
767 | */ | |
a167f663 | 768 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 769 | |
a6ff7e08 | 770 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
4f024f37 | 771 | bio->bi_iter.bi_sector = sector; |
7bfa19f2 N |
772 | bio_add_page(bio, page, size, 0); |
773 | bio->bi_private = rdev; | |
774 | bio->bi_end_io = super_written; | |
a9701a30 | 775 | |
7bfa19f2 | 776 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 777 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
778 | } |
779 | ||
fd01b88c | 780 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 781 | { |
e9c7469b | 782 | /* wait for all superblock writes that were scheduled to complete */ |
1967cd56 | 783 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
7bfa19f2 N |
784 | } |
785 | ||
3cb03002 | 786 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 787 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 788 | { |
a167f663 | 789 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
790 | int ret; |
791 | ||
a6ff7e08 JB |
792 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
793 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 | 794 | if (metadata_op) |
4f024f37 | 795 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
1fdd6fc9 N |
796 | else if (rdev->mddev->reshape_position != MaxSector && |
797 | (rdev->mddev->reshape_backwards == | |
798 | (sector >= rdev->mddev->reshape_position))) | |
4f024f37 | 799 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
ccebd4c4 | 800 | else |
4f024f37 | 801 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
1da177e4 | 802 | bio_add_page(bio, page, size, 0); |
c170bbb4 | 803 | submit_bio_wait(rw, bio); |
1da177e4 LT |
804 | |
805 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
806 | bio_put(bio); | |
807 | return ret; | |
808 | } | |
a8745db2 | 809 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 810 | |
f72ffdd6 | 811 | static int read_disk_sb(struct md_rdev *rdev, int size) |
1da177e4 LT |
812 | { |
813 | char b[BDEVNAME_SIZE]; | |
403df478 | 814 | |
1da177e4 LT |
815 | if (rdev->sb_loaded) |
816 | return 0; | |
817 | ||
ccebd4c4 | 818 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
819 | goto fail; |
820 | rdev->sb_loaded = 1; | |
821 | return 0; | |
822 | ||
823 | fail: | |
824 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
825 | bdevname(rdev->bdev,b)); | |
826 | return -EINVAL; | |
827 | } | |
828 | ||
829 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
830 | { | |
f72ffdd6 | 831 | return sb1->set_uuid0 == sb2->set_uuid0 && |
05710466 AN |
832 | sb1->set_uuid1 == sb2->set_uuid1 && |
833 | sb1->set_uuid2 == sb2->set_uuid2 && | |
834 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
835 | } |
836 | ||
1da177e4 LT |
837 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
838 | { | |
839 | int ret; | |
840 | mdp_super_t *tmp1, *tmp2; | |
841 | ||
842 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
843 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
844 | ||
845 | if (!tmp1 || !tmp2) { | |
846 | ret = 0; | |
35020f1a | 847 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
848 | goto abort; |
849 | } | |
850 | ||
851 | *tmp1 = *sb1; | |
852 | *tmp2 = *sb2; | |
853 | ||
854 | /* | |
855 | * nr_disks is not constant | |
856 | */ | |
857 | tmp1->nr_disks = 0; | |
858 | tmp2->nr_disks = 0; | |
859 | ||
ce0c8e05 | 860 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 861 | abort: |
990a8baf JJ |
862 | kfree(tmp1); |
863 | kfree(tmp2); | |
1da177e4 LT |
864 | return ret; |
865 | } | |
866 | ||
4d167f09 N |
867 | static u32 md_csum_fold(u32 csum) |
868 | { | |
869 | csum = (csum & 0xffff) + (csum >> 16); | |
870 | return (csum & 0xffff) + (csum >> 16); | |
871 | } | |
872 | ||
f72ffdd6 | 873 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
1da177e4 | 874 | { |
4d167f09 N |
875 | u64 newcsum = 0; |
876 | u32 *sb32 = (u32*)sb; | |
877 | int i; | |
1da177e4 LT |
878 | unsigned int disk_csum, csum; |
879 | ||
880 | disk_csum = sb->sb_csum; | |
881 | sb->sb_csum = 0; | |
4d167f09 N |
882 | |
883 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
884 | newcsum += sb32[i]; | |
885 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
886 | ||
4d167f09 N |
887 | #ifdef CONFIG_ALPHA |
888 | /* This used to use csum_partial, which was wrong for several | |
889 | * reasons including that different results are returned on | |
890 | * different architectures. It isn't critical that we get exactly | |
891 | * the same return value as before (we always csum_fold before | |
892 | * testing, and that removes any differences). However as we | |
893 | * know that csum_partial always returned a 16bit value on | |
894 | * alphas, do a fold to maximise conformity to previous behaviour. | |
895 | */ | |
896 | sb->sb_csum = md_csum_fold(disk_csum); | |
897 | #else | |
1da177e4 | 898 | sb->sb_csum = disk_csum; |
4d167f09 | 899 | #endif |
1da177e4 LT |
900 | return csum; |
901 | } | |
902 | ||
1da177e4 LT |
903 | /* |
904 | * Handle superblock details. | |
905 | * We want to be able to handle multiple superblock formats | |
906 | * so we have a common interface to them all, and an array of | |
907 | * different handlers. | |
908 | * We rely on user-space to write the initial superblock, and support | |
909 | * reading and updating of superblocks. | |
910 | * Interface methods are: | |
3cb03002 | 911 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
912 | * loads and validates a superblock on dev. |
913 | * if refdev != NULL, compare superblocks on both devices | |
914 | * Return: | |
915 | * 0 - dev has a superblock that is compatible with refdev | |
916 | * 1 - dev has a superblock that is compatible and newer than refdev | |
917 | * so dev should be used as the refdev in future | |
918 | * -EINVAL superblock incompatible or invalid | |
919 | * -othererror e.g. -EIO | |
920 | * | |
fd01b88c | 921 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
922 | * Verify that dev is acceptable into mddev. |
923 | * The first time, mddev->raid_disks will be 0, and data from | |
924 | * dev should be merged in. Subsequent calls check that dev | |
925 | * is new enough. Return 0 or -EINVAL | |
926 | * | |
fd01b88c | 927 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
928 | * Update the superblock for rdev with data in mddev |
929 | * This does not write to disc. | |
930 | * | |
931 | */ | |
932 | ||
933 | struct super_type { | |
0cd17fec CW |
934 | char *name; |
935 | struct module *owner; | |
c6563a8c N |
936 | int (*load_super)(struct md_rdev *rdev, |
937 | struct md_rdev *refdev, | |
0cd17fec | 938 | int minor_version); |
c6563a8c N |
939 | int (*validate_super)(struct mddev *mddev, |
940 | struct md_rdev *rdev); | |
941 | void (*sync_super)(struct mddev *mddev, | |
942 | struct md_rdev *rdev); | |
3cb03002 | 943 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 944 | sector_t num_sectors); |
c6563a8c N |
945 | int (*allow_new_offset)(struct md_rdev *rdev, |
946 | unsigned long long new_offset); | |
1da177e4 LT |
947 | }; |
948 | ||
0894cc30 AN |
949 | /* |
950 | * Check that the given mddev has no bitmap. | |
951 | * | |
952 | * This function is called from the run method of all personalities that do not | |
953 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
954 | * has a bitmap. Otherwise, it returns 0. | |
955 | * | |
956 | */ | |
fd01b88c | 957 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 958 | { |
c3d9714e | 959 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
960 | return 0; |
961 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
962 | mdname(mddev), mddev->pers->name); | |
963 | return 1; | |
964 | } | |
965 | EXPORT_SYMBOL(md_check_no_bitmap); | |
966 | ||
1da177e4 | 967 | /* |
f72ffdd6 | 968 | * load_super for 0.90.0 |
1da177e4 | 969 | */ |
3cb03002 | 970 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
971 | { |
972 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
973 | mdp_super_t *sb; | |
974 | int ret; | |
1da177e4 LT |
975 | |
976 | /* | |
0f420358 | 977 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
978 | * it's at the end of the disk. |
979 | * | |
980 | * It also happens to be a multiple of 4Kb. | |
981 | */ | |
57b2caa3 | 982 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 983 | |
0002b271 | 984 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
985 | if (ret) return ret; |
986 | ||
987 | ret = -EINVAL; | |
988 | ||
989 | bdevname(rdev->bdev, b); | |
65a06f06 | 990 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
991 | |
992 | if (sb->md_magic != MD_SB_MAGIC) { | |
993 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
994 | b); | |
995 | goto abort; | |
996 | } | |
997 | ||
998 | if (sb->major_version != 0 || | |
f6705578 N |
999 | sb->minor_version < 90 || |
1000 | sb->minor_version > 91) { | |
1da177e4 LT |
1001 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1002 | sb->major_version, sb->minor_version, | |
1003 | b); | |
1004 | goto abort; | |
1005 | } | |
1006 | ||
1007 | if (sb->raid_disks <= 0) | |
1008 | goto abort; | |
1009 | ||
4d167f09 | 1010 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1011 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1012 | b); | |
1013 | goto abort; | |
1014 | } | |
1015 | ||
1016 | rdev->preferred_minor = sb->md_minor; | |
1017 | rdev->data_offset = 0; | |
c6563a8c | 1018 | rdev->new_data_offset = 0; |
0002b271 | 1019 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1020 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1021 | |
1022 | if (sb->level == LEVEL_MULTIPATH) | |
1023 | rdev->desc_nr = -1; | |
1024 | else | |
1025 | rdev->desc_nr = sb->this_disk.number; | |
1026 | ||
9a7b2b0f | 1027 | if (!refdev) { |
1da177e4 | 1028 | ret = 1; |
9a7b2b0f | 1029 | } else { |
1da177e4 | 1030 | __u64 ev1, ev2; |
65a06f06 | 1031 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1032 | if (!uuid_equal(refsb, sb)) { |
1033 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1034 | b, bdevname(refdev->bdev,b2)); | |
1035 | goto abort; | |
1036 | } | |
1037 | if (!sb_equal(refsb, sb)) { | |
1038 | printk(KERN_WARNING "md: %s has same UUID" | |
1039 | " but different superblock to %s\n", | |
1040 | b, bdevname(refdev->bdev, b2)); | |
1041 | goto abort; | |
1042 | } | |
1043 | ev1 = md_event(sb); | |
1044 | ev2 = md_event(refsb); | |
1045 | if (ev1 > ev2) | |
1046 | ret = 1; | |
f72ffdd6 | 1047 | else |
1da177e4 LT |
1048 | ret = 0; |
1049 | } | |
8190e754 | 1050 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1051 | /* Limit to 4TB as metadata cannot record more than that. |
1052 | * (not needed for Linear and RAID0 as metadata doesn't | |
1053 | * record this size) | |
1054 | */ | |
1055 | if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) | |
27a7b260 | 1056 | rdev->sectors = (2ULL << 32) - 2; |
1da177e4 | 1057 | |
27a7b260 | 1058 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1059 | /* "this cannot possibly happen" ... */ |
1060 | ret = -EINVAL; | |
1061 | ||
1da177e4 LT |
1062 | abort: |
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * validate_super for 0.90.0 | |
1068 | */ | |
fd01b88c | 1069 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1070 | { |
1071 | mdp_disk_t *desc; | |
65a06f06 | 1072 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1073 | __u64 ev1 = md_event(sb); |
1da177e4 | 1074 | |
41158c7e | 1075 | rdev->raid_disk = -1; |
c5d79adb N |
1076 | clear_bit(Faulty, &rdev->flags); |
1077 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1078 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1079 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1080 | |
1da177e4 LT |
1081 | if (mddev->raid_disks == 0) { |
1082 | mddev->major_version = 0; | |
1083 | mddev->minor_version = sb->minor_version; | |
1084 | mddev->patch_version = sb->patch_version; | |
e691063a | 1085 | mddev->external = 0; |
9d8f0363 | 1086 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1087 | mddev->ctime = sb->ctime; |
1088 | mddev->utime = sb->utime; | |
1089 | mddev->level = sb->level; | |
d9d166c2 | 1090 | mddev->clevel[0] = 0; |
1da177e4 LT |
1091 | mddev->layout = sb->layout; |
1092 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1093 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1094 | mddev->events = ev1; |
c3d9714e | 1095 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1096 | mddev->bitmap_info.space = 0; |
1097 | /* bitmap can use 60 K after the 4K superblocks */ | |
c3d9714e | 1098 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 1099 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
2c810cdd | 1100 | mddev->reshape_backwards = 0; |
1da177e4 | 1101 | |
f6705578 N |
1102 | if (mddev->minor_version >= 91) { |
1103 | mddev->reshape_position = sb->reshape_position; | |
1104 | mddev->delta_disks = sb->delta_disks; | |
1105 | mddev->new_level = sb->new_level; | |
1106 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1107 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1108 | if (mddev->delta_disks < 0) |
1109 | mddev->reshape_backwards = 1; | |
f6705578 N |
1110 | } else { |
1111 | mddev->reshape_position = MaxSector; | |
1112 | mddev->delta_disks = 0; | |
1113 | mddev->new_level = mddev->level; | |
1114 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1115 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1116 | } |
1117 | ||
1da177e4 LT |
1118 | if (sb->state & (1<<MD_SB_CLEAN)) |
1119 | mddev->recovery_cp = MaxSector; | |
1120 | else { | |
f72ffdd6 | 1121 | if (sb->events_hi == sb->cp_events_hi && |
1da177e4 LT |
1122 | sb->events_lo == sb->cp_events_lo) { |
1123 | mddev->recovery_cp = sb->recovery_cp; | |
1124 | } else | |
1125 | mddev->recovery_cp = 0; | |
1126 | } | |
1127 | ||
1128 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1129 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1130 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1131 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1132 | ||
1133 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1134 | |
1135 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
6409bb05 | 1136 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1137 | mddev->bitmap_info.offset = |
1138 | mddev->bitmap_info.default_offset; | |
6409bb05 | 1139 | mddev->bitmap_info.space = |
c9ad020f | 1140 | mddev->bitmap_info.default_space; |
6409bb05 | 1141 | } |
a654b9d8 | 1142 | |
41158c7e | 1143 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1144 | /* Insist on good event counter while assembling, except |
1145 | * for spares (which don't need an event count) */ | |
1da177e4 | 1146 | ++ev1; |
be6800a7 N |
1147 | if (sb->disks[rdev->desc_nr].state & ( |
1148 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
f72ffdd6 | 1149 | if (ev1 < mddev->events) |
be6800a7 | 1150 | return -EINVAL; |
41158c7e N |
1151 | } else if (mddev->bitmap) { |
1152 | /* if adding to array with a bitmap, then we can accept an | |
1153 | * older device ... but not too old. | |
1154 | */ | |
41158c7e N |
1155 | if (ev1 < mddev->bitmap->events_cleared) |
1156 | return 0; | |
8313b8e5 N |
1157 | if (ev1 < mddev->events) |
1158 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1159 | } else { |
1160 | if (ev1 < mddev->events) | |
1161 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1162 | return 0; | |
1163 | } | |
41158c7e | 1164 | |
1da177e4 | 1165 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1166 | desc = sb->disks + rdev->desc_nr; |
1167 | ||
1168 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1169 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1170 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1171 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1172 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1173 | rdev->raid_disk = desc->raid_disk; |
f466722c | 1174 | rdev->saved_raid_disk = desc->raid_disk; |
0261cd9f N |
1175 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1176 | /* active but not in sync implies recovery up to | |
1177 | * reshape position. We don't know exactly where | |
1178 | * that is, so set to zero for now */ | |
1179 | if (mddev->minor_version >= 91) { | |
1180 | rdev->recovery_offset = 0; | |
1181 | rdev->raid_disk = desc->raid_disk; | |
1182 | } | |
1da177e4 | 1183 | } |
8ddf9efe N |
1184 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1185 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1186 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1187 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1188 | return 0; |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * sync_super for 0.90.0 | |
1193 | */ | |
fd01b88c | 1194 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1195 | { |
1196 | mdp_super_t *sb; | |
3cb03002 | 1197 | struct md_rdev *rdev2; |
1da177e4 | 1198 | int next_spare = mddev->raid_disks; |
19133a42 | 1199 | |
1da177e4 LT |
1200 | /* make rdev->sb match mddev data.. |
1201 | * | |
1202 | * 1/ zero out disks | |
1203 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1204 | * 3/ any empty disks < next_spare become removed | |
1205 | * | |
1206 | * disks[0] gets initialised to REMOVED because | |
1207 | * we cannot be sure from other fields if it has | |
1208 | * been initialised or not. | |
1209 | */ | |
1210 | int i; | |
1211 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1212 | ||
61181565 N |
1213 | rdev->sb_size = MD_SB_BYTES; |
1214 | ||
65a06f06 | 1215 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1216 | |
1217 | memset(sb, 0, sizeof(*sb)); | |
1218 | ||
1219 | sb->md_magic = MD_SB_MAGIC; | |
1220 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1221 | sb->patch_version = mddev->patch_version; |
1222 | sb->gvalid_words = 0; /* ignored */ | |
1223 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1224 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1225 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1226 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1227 | ||
1228 | sb->ctime = mddev->ctime; | |
1229 | sb->level = mddev->level; | |
58c0fed4 | 1230 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1231 | sb->raid_disks = mddev->raid_disks; |
1232 | sb->md_minor = mddev->md_minor; | |
e691063a | 1233 | sb->not_persistent = 0; |
1da177e4 LT |
1234 | sb->utime = mddev->utime; |
1235 | sb->state = 0; | |
1236 | sb->events_hi = (mddev->events>>32); | |
1237 | sb->events_lo = (u32)mddev->events; | |
1238 | ||
f6705578 N |
1239 | if (mddev->reshape_position == MaxSector) |
1240 | sb->minor_version = 90; | |
1241 | else { | |
1242 | sb->minor_version = 91; | |
1243 | sb->reshape_position = mddev->reshape_position; | |
1244 | sb->new_level = mddev->new_level; | |
1245 | sb->delta_disks = mddev->delta_disks; | |
1246 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1247 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1248 | } |
1249 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1250 | if (mddev->in_sync) |
1251 | { | |
1252 | sb->recovery_cp = mddev->recovery_cp; | |
1253 | sb->cp_events_hi = (mddev->events>>32); | |
1254 | sb->cp_events_lo = (u32)mddev->events; | |
1255 | if (mddev->recovery_cp == MaxSector) | |
1256 | sb->state = (1<< MD_SB_CLEAN); | |
1257 | } else | |
1258 | sb->recovery_cp = 0; | |
1259 | ||
1260 | sb->layout = mddev->layout; | |
9d8f0363 | 1261 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1262 | |
c3d9714e | 1263 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1264 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1265 | ||
1da177e4 | 1266 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1267 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1268 | mdp_disk_t *d; |
86e6ffdd | 1269 | int desc_nr; |
0261cd9f N |
1270 | int is_active = test_bit(In_sync, &rdev2->flags); |
1271 | ||
1272 | if (rdev2->raid_disk >= 0 && | |
1273 | sb->minor_version >= 91) | |
1274 | /* we have nowhere to store the recovery_offset, | |
1275 | * but if it is not below the reshape_position, | |
1276 | * we can piggy-back on that. | |
1277 | */ | |
1278 | is_active = 1; | |
1279 | if (rdev2->raid_disk < 0 || | |
1280 | test_bit(Faulty, &rdev2->flags)) | |
1281 | is_active = 0; | |
1282 | if (is_active) | |
86e6ffdd | 1283 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1284 | else |
86e6ffdd | 1285 | desc_nr = next_spare++; |
19133a42 | 1286 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1287 | d = &sb->disks[rdev2->desc_nr]; |
1288 | nr_disks++; | |
1289 | d->number = rdev2->desc_nr; | |
1290 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1291 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1292 | if (is_active) |
1da177e4 LT |
1293 | d->raid_disk = rdev2->raid_disk; |
1294 | else | |
1295 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1296 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1297 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1298 | else if (is_active) { |
1da177e4 | 1299 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1300 | if (test_bit(In_sync, &rdev2->flags)) |
1301 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1302 | active++; |
1303 | working++; | |
1304 | } else { | |
1305 | d->state = 0; | |
1306 | spare++; | |
1307 | working++; | |
1308 | } | |
8ddf9efe N |
1309 | if (test_bit(WriteMostly, &rdev2->flags)) |
1310 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1311 | } |
1da177e4 LT |
1312 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1313 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1314 | mdp_disk_t *d = &sb->disks[i]; | |
1315 | if (d->state == 0 && d->number == 0) { | |
1316 | d->number = i; | |
1317 | d->raid_disk = i; | |
1318 | d->state = (1<<MD_DISK_REMOVED); | |
1319 | d->state |= (1<<MD_DISK_FAULTY); | |
1320 | failed++; | |
1321 | } | |
1322 | } | |
1323 | sb->nr_disks = nr_disks; | |
1324 | sb->active_disks = active; | |
1325 | sb->working_disks = working; | |
1326 | sb->failed_disks = failed; | |
1327 | sb->spare_disks = spare; | |
1328 | ||
1329 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1330 | sb->sb_csum = calc_sb_csum(sb); | |
1331 | } | |
1332 | ||
0cd17fec CW |
1333 | /* |
1334 | * rdev_size_change for 0.90.0 | |
1335 | */ | |
1336 | static unsigned long long | |
3cb03002 | 1337 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1338 | { |
58c0fed4 | 1339 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1340 | return 0; /* component must fit device */ |
c3d9714e | 1341 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1342 | return 0; /* can't move bitmap */ |
57b2caa3 | 1343 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1344 | if (!num_sectors || num_sectors > rdev->sb_start) |
1345 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1346 | /* Limit to 4TB as metadata cannot record more than that. |
1347 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1348 | */ | |
667a5313 | 1349 | if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) |
27a7b260 | 1350 | num_sectors = (2ULL << 32) - 2; |
0f420358 | 1351 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1352 | rdev->sb_page); |
1353 | md_super_wait(rdev->mddev); | |
c26a44ed | 1354 | return num_sectors; |
0cd17fec CW |
1355 | } |
1356 | ||
c6563a8c N |
1357 | static int |
1358 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1359 | { | |
1360 | /* non-zero offset changes not possible with v0.90 */ | |
1361 | return new_offset == 0; | |
1362 | } | |
0cd17fec | 1363 | |
1da177e4 LT |
1364 | /* |
1365 | * version 1 superblock | |
1366 | */ | |
1367 | ||
f72ffdd6 | 1368 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
1da177e4 | 1369 | { |
1c05b4bc N |
1370 | __le32 disk_csum; |
1371 | u32 csum; | |
1da177e4 LT |
1372 | unsigned long long newcsum; |
1373 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1374 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1375 | |
1376 | disk_csum = sb->sb_csum; | |
1377 | sb->sb_csum = 0; | |
1378 | newcsum = 0; | |
1f3c9907 | 1379 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1380 | newcsum += le32_to_cpu(*isuper++); |
1381 | ||
1382 | if (size == 2) | |
1c05b4bc | 1383 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1384 | |
1385 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1386 | sb->sb_csum = disk_csum; | |
1387 | return cpu_to_le32(csum); | |
1388 | } | |
1389 | ||
2699b672 N |
1390 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1391 | int acknowledged); | |
3cb03002 | 1392 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1393 | { |
1394 | struct mdp_superblock_1 *sb; | |
1395 | int ret; | |
0f420358 | 1396 | sector_t sb_start; |
c6563a8c | 1397 | sector_t sectors; |
1da177e4 | 1398 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1399 | int bmask; |
1da177e4 LT |
1400 | |
1401 | /* | |
0f420358 | 1402 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1403 | * It is always aligned to a 4K boundary and |
1404 | * depeding on minor_version, it can be: | |
1405 | * 0: At least 8K, but less than 12K, from end of device | |
1406 | * 1: At start of device | |
1407 | * 2: 4K from start of device. | |
1408 | */ | |
1409 | switch(minor_version) { | |
1410 | case 0: | |
77304d2a | 1411 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1412 | sb_start -= 8*2; |
1413 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1414 | break; |
1415 | case 1: | |
0f420358 | 1416 | sb_start = 0; |
1da177e4 LT |
1417 | break; |
1418 | case 2: | |
0f420358 | 1419 | sb_start = 8; |
1da177e4 LT |
1420 | break; |
1421 | default: | |
1422 | return -EINVAL; | |
1423 | } | |
0f420358 | 1424 | rdev->sb_start = sb_start; |
1da177e4 | 1425 | |
0002b271 N |
1426 | /* superblock is rarely larger than 1K, but it can be larger, |
1427 | * and it is safe to read 4k, so we do that | |
1428 | */ | |
1429 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1430 | if (ret) return ret; |
1431 | ||
65a06f06 | 1432 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1433 | |
1434 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1435 | sb->major_version != cpu_to_le32(1) || | |
1436 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1437 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1438 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1439 | return -EINVAL; |
1440 | ||
1441 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1442 | printk("md: invalid superblock checksum on %s\n", | |
1443 | bdevname(rdev->bdev,b)); | |
1444 | return -EINVAL; | |
1445 | } | |
1446 | if (le64_to_cpu(sb->data_size) < 10) { | |
1447 | printk("md: data_size too small on %s\n", | |
1448 | bdevname(rdev->bdev,b)); | |
1449 | return -EINVAL; | |
1450 | } | |
c6563a8c N |
1451 | if (sb->pad0 || |
1452 | sb->pad3[0] || | |
1453 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1454 | /* Some padding is non-zero, might be a new feature */ | |
1455 | return -EINVAL; | |
e11e93fa | 1456 | |
1da177e4 LT |
1457 | rdev->preferred_minor = 0xffff; |
1458 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1459 | rdev->new_data_offset = rdev->data_offset; |
1460 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1461 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1462 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1463 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1464 | |
0002b271 | 1465 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1466 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1467 | if (rdev->sb_size & bmask) |
a1801f85 N |
1468 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1469 | ||
1470 | if (minor_version | |
0f420358 | 1471 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1472 | return -EINVAL; |
c6563a8c N |
1473 | if (minor_version |
1474 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1475 | return -EINVAL; | |
0002b271 | 1476 | |
31b65a0d N |
1477 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1478 | rdev->desc_nr = -1; | |
1479 | else | |
1480 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1481 | ||
2699b672 N |
1482 | if (!rdev->bb_page) { |
1483 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1484 | if (!rdev->bb_page) | |
1485 | return -ENOMEM; | |
1486 | } | |
1487 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1488 | rdev->badblocks.count == 0) { | |
1489 | /* need to load the bad block list. | |
1490 | * Currently we limit it to one page. | |
1491 | */ | |
1492 | s32 offset; | |
1493 | sector_t bb_sector; | |
1494 | u64 *bbp; | |
1495 | int i; | |
1496 | int sectors = le16_to_cpu(sb->bblog_size); | |
1497 | if (sectors > (PAGE_SIZE / 512)) | |
1498 | return -EINVAL; | |
1499 | offset = le32_to_cpu(sb->bblog_offset); | |
1500 | if (offset == 0) | |
1501 | return -EINVAL; | |
1502 | bb_sector = (long long)offset; | |
1503 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1504 | rdev->bb_page, READ, true)) | |
1505 | return -EIO; | |
1506 | bbp = (u64 *)page_address(rdev->bb_page); | |
1507 | rdev->badblocks.shift = sb->bblog_shift; | |
1508 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1509 | u64 bb = le64_to_cpu(*bbp); | |
1510 | int count = bb & (0x3ff); | |
1511 | u64 sector = bb >> 10; | |
1512 | sector <<= sb->bblog_shift; | |
1513 | count <<= sb->bblog_shift; | |
1514 | if (bb + 1 == 0) | |
1515 | break; | |
1516 | if (md_set_badblocks(&rdev->badblocks, | |
1517 | sector, count, 1) == 0) | |
1518 | return -EINVAL; | |
1519 | } | |
486adf72 N |
1520 | } else if (sb->bblog_offset != 0) |
1521 | rdev->badblocks.shift = 0; | |
2699b672 | 1522 | |
9a7b2b0f | 1523 | if (!refdev) { |
8ed75463 | 1524 | ret = 1; |
9a7b2b0f | 1525 | } else { |
1da177e4 | 1526 | __u64 ev1, ev2; |
65a06f06 | 1527 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1528 | |
1529 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1530 | sb->level != refsb->level || | |
1531 | sb->layout != refsb->layout || | |
1532 | sb->chunksize != refsb->chunksize) { | |
1533 | printk(KERN_WARNING "md: %s has strangely different" | |
1534 | " superblock to %s\n", | |
1535 | bdevname(rdev->bdev,b), | |
1536 | bdevname(refdev->bdev,b2)); | |
1537 | return -EINVAL; | |
1538 | } | |
1539 | ev1 = le64_to_cpu(sb->events); | |
1540 | ev2 = le64_to_cpu(refsb->events); | |
1541 | ||
1542 | if (ev1 > ev2) | |
8ed75463 N |
1543 | ret = 1; |
1544 | else | |
1545 | ret = 0; | |
1da177e4 | 1546 | } |
c6563a8c N |
1547 | if (minor_version) { |
1548 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1549 | sectors -= rdev->data_offset; | |
1550 | } else | |
1551 | sectors = rdev->sb_start; | |
1552 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1553 | return -EINVAL; |
dd8ac336 | 1554 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1555 | return ret; |
1da177e4 LT |
1556 | } |
1557 | ||
fd01b88c | 1558 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1559 | { |
65a06f06 | 1560 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1561 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1562 | |
41158c7e | 1563 | rdev->raid_disk = -1; |
c5d79adb N |
1564 | clear_bit(Faulty, &rdev->flags); |
1565 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1566 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1567 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1568 | |
1da177e4 LT |
1569 | if (mddev->raid_disks == 0) { |
1570 | mddev->major_version = 1; | |
1571 | mddev->patch_version = 0; | |
e691063a | 1572 | mddev->external = 0; |
9d8f0363 | 1573 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1574 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1575 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1576 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1577 | mddev->clevel[0] = 0; |
1da177e4 LT |
1578 | mddev->layout = le32_to_cpu(sb->layout); |
1579 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1580 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1581 | mddev->events = ev1; |
c3d9714e | 1582 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1583 | mddev->bitmap_info.space = 0; |
1584 | /* Default location for bitmap is 1K after superblock | |
1585 | * using 3K - total of 4K | |
1586 | */ | |
c3d9714e | 1587 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1588 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1589 | mddev->reshape_backwards = 0; |
1590 | ||
1da177e4 LT |
1591 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1592 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1593 | ||
1594 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1595 | |
71c0805c | 1596 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1597 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1598 | mddev->bitmap_info.offset = |
1599 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1600 | /* Metadata doesn't record how much space is available. |
1601 | * For 1.0, we assume we can use up to the superblock | |
1602 | * if before, else to 4K beyond superblock. | |
1603 | * For others, assume no change is possible. | |
1604 | */ | |
1605 | if (mddev->minor_version > 0) | |
1606 | mddev->bitmap_info.space = 0; | |
1607 | else if (mddev->bitmap_info.offset > 0) | |
1608 | mddev->bitmap_info.space = | |
1609 | 8 - mddev->bitmap_info.offset; | |
1610 | else | |
1611 | mddev->bitmap_info.space = | |
1612 | -mddev->bitmap_info.offset; | |
1613 | } | |
e11e93fa | 1614 | |
f6705578 N |
1615 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1616 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1617 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1618 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1619 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1620 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1621 | if (mddev->delta_disks < 0 || |
1622 | (mddev->delta_disks == 0 && | |
1623 | (le32_to_cpu(sb->feature_map) | |
1624 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1625 | mddev->reshape_backwards = 1; | |
f6705578 N |
1626 | } else { |
1627 | mddev->reshape_position = MaxSector; | |
1628 | mddev->delta_disks = 0; | |
1629 | mddev->new_level = mddev->level; | |
1630 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1631 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1632 | } |
1633 | ||
41158c7e | 1634 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1635 | /* Insist of good event counter while assembling, except for |
1636 | * spares (which don't need an event count) */ | |
1da177e4 | 1637 | ++ev1; |
be6800a7 N |
1638 | if (rdev->desc_nr >= 0 && |
1639 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1640 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1641 | if (ev1 < mddev->events) | |
1642 | return -EINVAL; | |
41158c7e N |
1643 | } else if (mddev->bitmap) { |
1644 | /* If adding to array with a bitmap, then we can accept an | |
1645 | * older device, but not too old. | |
1646 | */ | |
41158c7e N |
1647 | if (ev1 < mddev->bitmap->events_cleared) |
1648 | return 0; | |
8313b8e5 N |
1649 | if (ev1 < mddev->events) |
1650 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1651 | } else { |
1652 | if (ev1 < mddev->events) | |
1653 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1654 | return 0; | |
1655 | } | |
1da177e4 LT |
1656 | if (mddev->level != LEVEL_MULTIPATH) { |
1657 | int role; | |
3673f305 N |
1658 | if (rdev->desc_nr < 0 || |
1659 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1660 | role = 0xffff; | |
1661 | rdev->desc_nr = -1; | |
1662 | } else | |
1663 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1664 | switch(role) { |
1665 | case 0xffff: /* spare */ | |
1da177e4 LT |
1666 | break; |
1667 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1668 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1669 | break; |
1670 | default: | |
f466722c | 1671 | rdev->saved_raid_disk = role; |
5fd6c1dc | 1672 | if ((le32_to_cpu(sb->feature_map) & |
f466722c | 1673 | MD_FEATURE_RECOVERY_OFFSET)) { |
5fd6c1dc | 1674 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
f466722c N |
1675 | if (!(le32_to_cpu(sb->feature_map) & |
1676 | MD_FEATURE_RECOVERY_BITMAP)) | |
1677 | rdev->saved_raid_disk = -1; | |
1678 | } else | |
5fd6c1dc | 1679 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1680 | rdev->raid_disk = role; |
1681 | break; | |
1682 | } | |
8ddf9efe N |
1683 | if (sb->devflags & WriteMostly1) |
1684 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1685 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1686 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1687 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1688 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1689 | |
1da177e4 LT |
1690 | return 0; |
1691 | } | |
1692 | ||
fd01b88c | 1693 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1694 | { |
1695 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1696 | struct md_rdev *rdev2; |
1da177e4 LT |
1697 | int max_dev, i; |
1698 | /* make rdev->sb match mddev and rdev data. */ | |
1699 | ||
65a06f06 | 1700 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1701 | |
1702 | sb->feature_map = 0; | |
1703 | sb->pad0 = 0; | |
5fd6c1dc | 1704 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1705 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1706 | ||
1707 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1708 | sb->events = cpu_to_le64(mddev->events); | |
1709 | if (mddev->in_sync) | |
1710 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1711 | else | |
1712 | sb->resync_offset = cpu_to_le64(0); | |
1713 | ||
1c05b4bc | 1714 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1715 | |
f0ca340c | 1716 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1717 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1718 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1719 | sb->level = cpu_to_le32(mddev->level); |
1720 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1721 | |
aeb9b211 N |
1722 | if (test_bit(WriteMostly, &rdev->flags)) |
1723 | sb->devflags |= WriteMostly1; | |
1724 | else | |
1725 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1726 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1727 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1728 | |
c3d9714e N |
1729 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1730 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1731 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1732 | } |
5fd6c1dc N |
1733 | |
1734 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1735 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1736 | sb->feature_map |= |
1737 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1738 | sb->recovery_offset = | |
1739 | cpu_to_le64(rdev->recovery_offset); | |
f466722c N |
1740 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
1741 | sb->feature_map |= | |
1742 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); | |
5fd6c1dc | 1743 | } |
2d78f8c4 N |
1744 | if (test_bit(Replacement, &rdev->flags)) |
1745 | sb->feature_map |= | |
1746 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1747 | |
f6705578 N |
1748 | if (mddev->reshape_position != MaxSector) { |
1749 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1750 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1751 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1752 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1753 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1754 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1755 | if (mddev->delta_disks == 0 && |
1756 | mddev->reshape_backwards) | |
1757 | sb->feature_map | |
1758 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1759 | if (rdev->new_data_offset != rdev->data_offset) { |
1760 | sb->feature_map | |
1761 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1762 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1763 | - rdev->data_offset)); | |
1764 | } | |
f6705578 | 1765 | } |
a654b9d8 | 1766 | |
2699b672 N |
1767 | if (rdev->badblocks.count == 0) |
1768 | /* Nothing to do for bad blocks*/ ; | |
1769 | else if (sb->bblog_offset == 0) | |
1770 | /* Cannot record bad blocks on this device */ | |
1771 | md_error(mddev, rdev); | |
1772 | else { | |
1773 | struct badblocks *bb = &rdev->badblocks; | |
1774 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1775 | u64 *p = bb->page; | |
1776 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1777 | if (bb->changed) { | |
1778 | unsigned seq; | |
1779 | ||
1780 | retry: | |
1781 | seq = read_seqbegin(&bb->lock); | |
1782 | ||
1783 | memset(bbp, 0xff, PAGE_SIZE); | |
1784 | ||
1785 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1786 | u64 internal_bb = p[i]; |
2699b672 N |
1787 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1788 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1789 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1790 | } |
d0962936 | 1791 | bb->changed = 0; |
2699b672 N |
1792 | if (read_seqretry(&bb->lock, seq)) |
1793 | goto retry; | |
1794 | ||
1795 | bb->sector = (rdev->sb_start + | |
1796 | (int)le32_to_cpu(sb->bblog_offset)); | |
1797 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1798 | } |
1799 | } | |
1800 | ||
1da177e4 | 1801 | max_dev = 0; |
dafb20fa | 1802 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1803 | if (rdev2->desc_nr+1 > max_dev) |
1804 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1805 | |
70471daf N |
1806 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1807 | int bmask; | |
a778b73f | 1808 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1809 | rdev->sb_size = max_dev * 2 + 256; |
1810 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1811 | if (rdev->sb_size & bmask) | |
1812 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1813 | } else |
1814 | max_dev = le32_to_cpu(sb->max_dev); | |
1815 | ||
1da177e4 LT |
1816 | for (i=0; i<max_dev;i++) |
1817 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
f72ffdd6 | 1818 | |
dafb20fa | 1819 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1820 | i = rdev2->desc_nr; |
b2d444d7 | 1821 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1822 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1823 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1824 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1825 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1826 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1827 | else |
1828 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1829 | } | |
1830 | ||
1da177e4 LT |
1831 | sb->sb_csum = calc_sb_1_csum(sb); |
1832 | } | |
1833 | ||
0cd17fec | 1834 | static unsigned long long |
3cb03002 | 1835 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1836 | { |
1837 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1838 | sector_t max_sectors; |
58c0fed4 | 1839 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1840 | return 0; /* component must fit device */ |
c6563a8c N |
1841 | if (rdev->data_offset != rdev->new_data_offset) |
1842 | return 0; /* too confusing */ | |
0f420358 | 1843 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1844 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1845 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1846 | max_sectors -= rdev->data_offset; |
1847 | if (!num_sectors || num_sectors > max_sectors) | |
1848 | num_sectors = max_sectors; | |
c3d9714e | 1849 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1850 | /* minor version 0 with bitmap we can't move */ |
1851 | return 0; | |
1852 | } else { | |
1853 | /* minor version 0; superblock after data */ | |
0f420358 | 1854 | sector_t sb_start; |
77304d2a | 1855 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1856 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1857 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1858 | if (!num_sectors || num_sectors > max_sectors) |
1859 | num_sectors = max_sectors; | |
0f420358 | 1860 | rdev->sb_start = sb_start; |
0cd17fec | 1861 | } |
65a06f06 | 1862 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1863 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1864 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1865 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1866 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1867 | rdev->sb_page); |
1868 | md_super_wait(rdev->mddev); | |
c26a44ed | 1869 | return num_sectors; |
c6563a8c N |
1870 | |
1871 | } | |
1872 | ||
1873 | static int | |
1874 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1875 | unsigned long long new_offset) | |
1876 | { | |
1877 | /* All necessary checks on new >= old have been done */ | |
1878 | struct bitmap *bitmap; | |
1879 | if (new_offset >= rdev->data_offset) | |
1880 | return 1; | |
1881 | ||
1882 | /* with 1.0 metadata, there is no metadata to tread on | |
1883 | * so we can always move back */ | |
1884 | if (rdev->mddev->minor_version == 0) | |
1885 | return 1; | |
1886 | ||
1887 | /* otherwise we must be sure not to step on | |
1888 | * any metadata, so stay: | |
1889 | * 36K beyond start of superblock | |
1890 | * beyond end of badblocks | |
1891 | * beyond write-intent bitmap | |
1892 | */ | |
1893 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1894 | return 0; | |
1895 | bitmap = rdev->mddev->bitmap; | |
1896 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1897 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 1898 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
1899 | return 0; |
1900 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1901 | return 0; | |
1902 | ||
1903 | return 1; | |
0cd17fec | 1904 | } |
1da177e4 | 1905 | |
75c96f85 | 1906 | static struct super_type super_types[] = { |
1da177e4 LT |
1907 | [0] = { |
1908 | .name = "0.90.0", | |
1909 | .owner = THIS_MODULE, | |
0cd17fec CW |
1910 | .load_super = super_90_load, |
1911 | .validate_super = super_90_validate, | |
1912 | .sync_super = super_90_sync, | |
1913 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1914 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1915 | }, |
1916 | [1] = { | |
1917 | .name = "md-1", | |
1918 | .owner = THIS_MODULE, | |
0cd17fec CW |
1919 | .load_super = super_1_load, |
1920 | .validate_super = super_1_validate, | |
1921 | .sync_super = super_1_sync, | |
1922 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1923 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1924 | }, |
1925 | }; | |
1da177e4 | 1926 | |
fd01b88c | 1927 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1928 | { |
1929 | if (mddev->sync_super) { | |
1930 | mddev->sync_super(mddev, rdev); | |
1931 | return; | |
1932 | } | |
1933 | ||
1934 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1935 | ||
1936 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1937 | } | |
1938 | ||
fd01b88c | 1939 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1940 | { |
3cb03002 | 1941 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1942 | |
4b80991c N |
1943 | rcu_read_lock(); |
1944 | rdev_for_each_rcu(rdev, mddev1) | |
1945 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1946 | if (rdev->bdev->bd_contains == |
4b80991c N |
1947 | rdev2->bdev->bd_contains) { |
1948 | rcu_read_unlock(); | |
7dd5e7c3 | 1949 | return 1; |
4b80991c N |
1950 | } |
1951 | rcu_read_unlock(); | |
1da177e4 LT |
1952 | return 0; |
1953 | } | |
1954 | ||
1955 | static LIST_HEAD(pending_raid_disks); | |
1956 | ||
ac5e7113 AN |
1957 | /* |
1958 | * Try to register data integrity profile for an mddev | |
1959 | * | |
1960 | * This is called when an array is started and after a disk has been kicked | |
1961 | * from the array. It only succeeds if all working and active component devices | |
1962 | * are integrity capable with matching profiles. | |
1963 | */ | |
fd01b88c | 1964 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1965 | { |
3cb03002 | 1966 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1967 | |
1968 | if (list_empty(&mddev->disks)) | |
1969 | return 0; /* nothing to do */ | |
629acb6a JB |
1970 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1971 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 1972 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
1973 | /* skip spares and non-functional disks */ |
1974 | if (test_bit(Faulty, &rdev->flags)) | |
1975 | continue; | |
1976 | if (rdev->raid_disk < 0) | |
1977 | continue; | |
ac5e7113 AN |
1978 | if (!reference) { |
1979 | /* Use the first rdev as the reference */ | |
1980 | reference = rdev; | |
1981 | continue; | |
1982 | } | |
1983 | /* does this rdev's profile match the reference profile? */ | |
1984 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1985 | rdev->bdev->bd_disk) < 0) | |
1986 | return -EINVAL; | |
1987 | } | |
89078d57 MP |
1988 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1989 | return 0; | |
ac5e7113 AN |
1990 | /* |
1991 | * All component devices are integrity capable and have matching | |
1992 | * profiles, register the common profile for the md device. | |
1993 | */ | |
1994 | if (blk_integrity_register(mddev->gendisk, | |
1995 | bdev_get_integrity(reference->bdev)) != 0) { | |
1996 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1997 | mdname(mddev)); | |
1998 | return -EINVAL; | |
1999 | } | |
a91a2785 MP |
2000 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
2001 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
2002 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
2003 | mdname(mddev)); | |
2004 | return -EINVAL; | |
2005 | } | |
ac5e7113 AN |
2006 | return 0; |
2007 | } | |
2008 | EXPORT_SYMBOL(md_integrity_register); | |
2009 | ||
2010 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 2011 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 2012 | { |
2863b9eb JB |
2013 | struct blk_integrity *bi_rdev; |
2014 | struct blk_integrity *bi_mddev; | |
2015 | ||
2016 | if (!mddev->gendisk) | |
2017 | return; | |
2018 | ||
2019 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
2020 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 2021 | |
ac5e7113 | 2022 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 2023 | return; |
ac5e7113 | 2024 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 2025 | return; |
ac5e7113 AN |
2026 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2027 | rdev->bdev->bd_disk) >= 0) | |
2028 | return; | |
2029 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2030 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2031 | } |
ac5e7113 | 2032 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2033 | |
f72ffdd6 | 2034 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 2035 | { |
7dd5e7c3 | 2036 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2037 | struct kobject *ko; |
1edf80d3 | 2038 | char *s; |
5e55e2f5 | 2039 | int err; |
1da177e4 | 2040 | |
11e2ede0 DW |
2041 | /* prevent duplicates */ |
2042 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2043 | return -EEXIST; | |
2044 | ||
dd8ac336 AN |
2045 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2046 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2047 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2048 | if (mddev->pers) { |
2049 | /* Cannot change size, so fail | |
2050 | * If mddev->level <= 0, then we don't care | |
2051 | * about aligning sizes (e.g. linear) | |
2052 | */ | |
2053 | if (mddev->level > 0) | |
2054 | return -ENOSPC; | |
2055 | } else | |
dd8ac336 | 2056 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2057 | } |
1da177e4 LT |
2058 | |
2059 | /* Verify rdev->desc_nr is unique. | |
2060 | * If it is -1, assign a free number, else | |
2061 | * check number is not in use | |
2062 | */ | |
4878e9eb | 2063 | rcu_read_lock(); |
1da177e4 LT |
2064 | if (rdev->desc_nr < 0) { |
2065 | int choice = 0; | |
4878e9eb N |
2066 | if (mddev->pers) |
2067 | choice = mddev->raid_disks; | |
2068 | while (find_rdev_nr_rcu(mddev, choice)) | |
1da177e4 LT |
2069 | choice++; |
2070 | rdev->desc_nr = choice; | |
2071 | } else { | |
4878e9eb N |
2072 | if (find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
2073 | rcu_read_unlock(); | |
1da177e4 | 2074 | return -EBUSY; |
4878e9eb | 2075 | } |
1da177e4 | 2076 | } |
4878e9eb | 2077 | rcu_read_unlock(); |
de01dfad N |
2078 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2079 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2080 | mdname(mddev), mddev->max_disks); | |
2081 | return -EBUSY; | |
2082 | } | |
19133a42 | 2083 | bdevname(rdev->bdev,b); |
649316b2 | 2084 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2085 | *s = '!'; |
649316b2 | 2086 | |
1da177e4 | 2087 | rdev->mddev = mddev; |
19133a42 | 2088 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2089 | |
b2d6db58 | 2090 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2091 | goto fail; |
86e6ffdd | 2092 | |
0762b8bd | 2093 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2094 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2095 | /* failure here is OK */; | |
2096 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2097 | |
4b80991c | 2098 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2099 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2100 | |
2101 | /* May as well allow recovery to be retried once */ | |
5389042f | 2102 | mddev->recovery_disabled++; |
3f9d99c1 | 2103 | |
1da177e4 | 2104 | return 0; |
5e55e2f5 N |
2105 | |
2106 | fail: | |
2107 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2108 | b, mdname(mddev)); | |
2109 | return err; | |
1da177e4 LT |
2110 | } |
2111 | ||
177a99b2 | 2112 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2113 | { |
3cb03002 | 2114 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2115 | kobject_del(&rdev->kobj); |
177a99b2 | 2116 | kobject_put(&rdev->kobj); |
5792a285 N |
2117 | } |
2118 | ||
f72ffdd6 | 2119 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2120 | { |
2121 | char b[BDEVNAME_SIZE]; | |
403df478 | 2122 | |
49731baa | 2123 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2124 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2125 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2126 | rdev->mddev = NULL; | |
86e6ffdd | 2127 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2128 | sysfs_put(rdev->sysfs_state); |
2129 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2130 | rdev->badblocks.count = 0; |
5792a285 | 2131 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2132 | * writing to 'remove' to "dev/state". We also need |
2133 | * to delay it due to rcu usage. | |
5792a285 | 2134 | */ |
4b80991c | 2135 | synchronize_rcu(); |
177a99b2 N |
2136 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2137 | kobject_get(&rdev->kobj); | |
e804ac78 | 2138 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2139 | } |
2140 | ||
2141 | /* | |
2142 | * prevent the device from being mounted, repartitioned or | |
2143 | * otherwise reused by a RAID array (or any other kernel | |
2144 | * subsystem), by bd_claiming the device. | |
2145 | */ | |
3cb03002 | 2146 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2147 | { |
2148 | int err = 0; | |
2149 | struct block_device *bdev; | |
2150 | char b[BDEVNAME_SIZE]; | |
2151 | ||
d4d77629 | 2152 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2153 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2154 | if (IS_ERR(bdev)) { |
2155 | printk(KERN_ERR "md: could not open %s.\n", | |
2156 | __bdevname(dev, b)); | |
2157 | return PTR_ERR(bdev); | |
2158 | } | |
1da177e4 LT |
2159 | rdev->bdev = bdev; |
2160 | return err; | |
2161 | } | |
2162 | ||
3cb03002 | 2163 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2164 | { |
2165 | struct block_device *bdev = rdev->bdev; | |
2166 | rdev->bdev = NULL; | |
e525fd89 | 2167 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2168 | } |
2169 | ||
2170 | void md_autodetect_dev(dev_t dev); | |
2171 | ||
f72ffdd6 | 2172 | static void export_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2173 | { |
2174 | char b[BDEVNAME_SIZE]; | |
403df478 | 2175 | |
1da177e4 LT |
2176 | printk(KERN_INFO "md: export_rdev(%s)\n", |
2177 | bdevname(rdev->bdev,b)); | |
545c8795 | 2178 | md_rdev_clear(rdev); |
1da177e4 | 2179 | #ifndef MODULE |
d0fae18f N |
2180 | if (test_bit(AutoDetected, &rdev->flags)) |
2181 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2182 | #endif |
2183 | unlock_rdev(rdev); | |
86e6ffdd | 2184 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2185 | } |
2186 | ||
f72ffdd6 | 2187 | static void kick_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2188 | { |
2189 | unbind_rdev_from_array(rdev); | |
2190 | export_rdev(rdev); | |
2191 | } | |
2192 | ||
fd01b88c | 2193 | static void export_array(struct mddev *mddev) |
1da177e4 | 2194 | { |
0638bb0e | 2195 | struct md_rdev *rdev; |
1da177e4 | 2196 | |
0638bb0e N |
2197 | while (!list_empty(&mddev->disks)) { |
2198 | rdev = list_first_entry(&mddev->disks, struct md_rdev, | |
2199 | same_set); | |
1da177e4 LT |
2200 | kick_rdev_from_array(rdev); |
2201 | } | |
1da177e4 LT |
2202 | mddev->raid_disks = 0; |
2203 | mddev->major_version = 0; | |
2204 | } | |
2205 | ||
f72ffdd6 | 2206 | static void sync_sbs(struct mddev *mddev, int nospares) |
1da177e4 | 2207 | { |
42543769 N |
2208 | /* Update each superblock (in-memory image), but |
2209 | * if we are allowed to, skip spares which already | |
2210 | * have the right event counter, or have one earlier | |
2211 | * (which would mean they aren't being marked as dirty | |
2212 | * with the rest of the array) | |
2213 | */ | |
3cb03002 | 2214 | struct md_rdev *rdev; |
dafb20fa | 2215 | rdev_for_each(rdev, mddev) { |
42543769 N |
2216 | if (rdev->sb_events == mddev->events || |
2217 | (nospares && | |
2218 | rdev->raid_disk < 0 && | |
42543769 N |
2219 | rdev->sb_events+1 == mddev->events)) { |
2220 | /* Don't update this superblock */ | |
2221 | rdev->sb_loaded = 2; | |
2222 | } else { | |
076f968b | 2223 | sync_super(mddev, rdev); |
42543769 N |
2224 | rdev->sb_loaded = 1; |
2225 | } | |
1da177e4 LT |
2226 | } |
2227 | } | |
2228 | ||
f72ffdd6 | 2229 | static void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2230 | { |
3cb03002 | 2231 | struct md_rdev *rdev; |
06d91a5f | 2232 | int sync_req; |
42543769 | 2233 | int nospares = 0; |
2699b672 | 2234 | int any_badblocks_changed = 0; |
1da177e4 | 2235 | |
d87f064f N |
2236 | if (mddev->ro) { |
2237 | if (force_change) | |
2238 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2239 | return; | |
2240 | } | |
1da177e4 | 2241 | repeat: |
3a3a5ddb | 2242 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2243 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2244 | if (rdev->raid_disk >= 0 && |
2245 | mddev->delta_disks >= 0 && | |
2246 | !test_bit(In_sync, &rdev->flags) && | |
2247 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2248 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2249 | ||
f72ffdd6 | 2250 | } |
bd52b746 | 2251 | if (!mddev->persistent) { |
070dc6dd | 2252 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2253 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2254 | if (!mddev->external) { |
d97a41dc | 2255 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2256 | rdev_for_each(rdev, mddev) { |
de393cde | 2257 | if (rdev->badblocks.changed) { |
d0962936 | 2258 | rdev->badblocks.changed = 0; |
de393cde N |
2259 | md_ack_all_badblocks(&rdev->badblocks); |
2260 | md_error(mddev, rdev); | |
2261 | } | |
2262 | clear_bit(Blocked, &rdev->flags); | |
2263 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2264 | wake_up(&rdev->blocked_wait); | |
2265 | } | |
2266 | } | |
3a3a5ddb N |
2267 | wake_up(&mddev->sb_wait); |
2268 | return; | |
2269 | } | |
2270 | ||
85572d7c | 2271 | spin_lock(&mddev->lock); |
84692195 | 2272 | |
3a3a5ddb N |
2273 | mddev->utime = get_seconds(); |
2274 | ||
850b2b42 N |
2275 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2276 | force_change = 1; | |
2277 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2278 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2279 | * though if events isn't the right even/odd, we will have to do | |
2280 | * spares after all | |
2281 | */ | |
2282 | nospares = 1; | |
2283 | if (force_change) | |
2284 | nospares = 0; | |
2285 | if (mddev->degraded) | |
84692195 N |
2286 | /* If the array is degraded, then skipping spares is both |
2287 | * dangerous and fairly pointless. | |
2288 | * Dangerous because a device that was removed from the array | |
2289 | * might have a event_count that still looks up-to-date, | |
2290 | * so it can be re-added without a resync. | |
2291 | * Pointless because if there are any spares to skip, | |
2292 | * then a recovery will happen and soon that array won't | |
2293 | * be degraded any more and the spare can go back to sleep then. | |
2294 | */ | |
850b2b42 | 2295 | nospares = 0; |
84692195 | 2296 | |
06d91a5f | 2297 | sync_req = mddev->in_sync; |
42543769 N |
2298 | |
2299 | /* If this is just a dirty<->clean transition, and the array is clean | |
2300 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2301 | if (nospares |
42543769 | 2302 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2303 | && mddev->can_decrease_events |
2304 | && mddev->events != 1) { | |
42543769 | 2305 | mddev->events--; |
a8707c08 N |
2306 | mddev->can_decrease_events = 0; |
2307 | } else { | |
42543769 N |
2308 | /* otherwise we have to go forward and ... */ |
2309 | mddev->events ++; | |
a8707c08 | 2310 | mddev->can_decrease_events = nospares; |
42543769 | 2311 | } |
1da177e4 | 2312 | |
403df478 N |
2313 | /* |
2314 | * This 64-bit counter should never wrap. | |
2315 | * Either we are in around ~1 trillion A.C., assuming | |
2316 | * 1 reboot per second, or we have a bug... | |
2317 | */ | |
2318 | WARN_ON(mddev->events == 0); | |
2699b672 | 2319 | |
dafb20fa | 2320 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2321 | if (rdev->badblocks.changed) |
2322 | any_badblocks_changed++; | |
de393cde N |
2323 | if (test_bit(Faulty, &rdev->flags)) |
2324 | set_bit(FaultRecorded, &rdev->flags); | |
2325 | } | |
2699b672 | 2326 | |
e691063a | 2327 | sync_sbs(mddev, nospares); |
85572d7c | 2328 | spin_unlock(&mddev->lock); |
1da177e4 | 2329 | |
36a4e1fe N |
2330 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2331 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2332 | |
4ad13663 | 2333 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2334 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2335 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2336 | |
42543769 N |
2337 | if (rdev->sb_loaded != 1) |
2338 | continue; /* no noise on spare devices */ | |
1da177e4 | 2339 | |
f466722c | 2340 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2341 | md_super_write(mddev,rdev, |
0f420358 | 2342 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2343 | rdev->sb_page); |
36a4e1fe N |
2344 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2345 | bdevname(rdev->bdev, b), | |
2346 | (unsigned long long)rdev->sb_start); | |
42543769 | 2347 | rdev->sb_events = mddev->events; |
2699b672 N |
2348 | if (rdev->badblocks.size) { |
2349 | md_super_write(mddev, rdev, | |
2350 | rdev->badblocks.sector, | |
2351 | rdev->badblocks.size << 9, | |
2352 | rdev->bb_page); | |
2353 | rdev->badblocks.size = 0; | |
2354 | } | |
7bfa19f2 | 2355 | |
f466722c | 2356 | } else |
36a4e1fe N |
2357 | pr_debug("md: %s (skipping faulty)\n", |
2358 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2359 | |
7bfa19f2 | 2360 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2361 | /* only need to write one superblock... */ |
2362 | break; | |
2363 | } | |
a9701a30 | 2364 | md_super_wait(mddev); |
850b2b42 | 2365 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2366 | |
85572d7c | 2367 | spin_lock(&mddev->lock); |
850b2b42 N |
2368 | if (mddev->in_sync != sync_req || |
2369 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2370 | /* have to write it out again */ |
85572d7c | 2371 | spin_unlock(&mddev->lock); |
06d91a5f N |
2372 | goto repeat; |
2373 | } | |
850b2b42 | 2374 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
85572d7c | 2375 | spin_unlock(&mddev->lock); |
3d310eb7 | 2376 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2377 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2378 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2379 | |
dafb20fa | 2380 | rdev_for_each(rdev, mddev) { |
de393cde N |
2381 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2382 | clear_bit(Blocked, &rdev->flags); | |
2383 | ||
2384 | if (any_badblocks_changed) | |
2699b672 | 2385 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2386 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2387 | wake_up(&rdev->blocked_wait); | |
2388 | } | |
1da177e4 LT |
2389 | } |
2390 | ||
7f6ce769 | 2391 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2392 | * We want to accept with case. For this we use cmd_match. |
2393 | */ | |
2394 | static int cmd_match(const char *cmd, const char *str) | |
2395 | { | |
2396 | /* See if cmd, written into a sysfs file, matches | |
2397 | * str. They must either be the same, or cmd can | |
2398 | * have a trailing newline | |
2399 | */ | |
2400 | while (*cmd && *str && *cmd == *str) { | |
2401 | cmd++; | |
2402 | str++; | |
2403 | } | |
2404 | if (*cmd == '\n') | |
2405 | cmd++; | |
2406 | if (*str || *cmd) | |
2407 | return 0; | |
2408 | return 1; | |
2409 | } | |
2410 | ||
86e6ffdd N |
2411 | struct rdev_sysfs_entry { |
2412 | struct attribute attr; | |
3cb03002 N |
2413 | ssize_t (*show)(struct md_rdev *, char *); |
2414 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2415 | }; |
2416 | ||
2417 | static ssize_t | |
3cb03002 | 2418 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2419 | { |
2420 | char *sep = ""; | |
20a49ff6 | 2421 | size_t len = 0; |
86e6ffdd | 2422 | |
de393cde N |
2423 | if (test_bit(Faulty, &rdev->flags) || |
2424 | rdev->badblocks.unacked_exist) { | |
86e6ffdd N |
2425 | len+= sprintf(page+len, "%sfaulty",sep); |
2426 | sep = ","; | |
2427 | } | |
b2d444d7 | 2428 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2429 | len += sprintf(page+len, "%sin_sync",sep); |
2430 | sep = ","; | |
2431 | } | |
f655675b N |
2432 | if (test_bit(WriteMostly, &rdev->flags)) { |
2433 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2434 | sep = ","; | |
2435 | } | |
de393cde | 2436 | if (test_bit(Blocked, &rdev->flags) || |
52c64152 N |
2437 | (rdev->badblocks.unacked_exist |
2438 | && !test_bit(Faulty, &rdev->flags))) { | |
6bfe0b49 DW |
2439 | len += sprintf(page+len, "%sblocked", sep); |
2440 | sep = ","; | |
2441 | } | |
b2d444d7 N |
2442 | if (!test_bit(Faulty, &rdev->flags) && |
2443 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2444 | len += sprintf(page+len, "%sspare", sep); |
2445 | sep = ","; | |
2446 | } | |
d7a9d443 N |
2447 | if (test_bit(WriteErrorSeen, &rdev->flags)) { |
2448 | len += sprintf(page+len, "%swrite_error", sep); | |
2449 | sep = ","; | |
2450 | } | |
2d78f8c4 N |
2451 | if (test_bit(WantReplacement, &rdev->flags)) { |
2452 | len += sprintf(page+len, "%swant_replacement", sep); | |
2453 | sep = ","; | |
2454 | } | |
2455 | if (test_bit(Replacement, &rdev->flags)) { | |
2456 | len += sprintf(page+len, "%sreplacement", sep); | |
2457 | sep = ","; | |
2458 | } | |
2459 | ||
86e6ffdd N |
2460 | return len+sprintf(page+len, "\n"); |
2461 | } | |
2462 | ||
45dc2de1 | 2463 | static ssize_t |
3cb03002 | 2464 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2465 | { |
2466 | /* can write | |
de393cde | 2467 | * faulty - simulates an error |
45dc2de1 | 2468 | * remove - disconnects the device |
f655675b N |
2469 | * writemostly - sets write_mostly |
2470 | * -writemostly - clears write_mostly | |
de393cde N |
2471 | * blocked - sets the Blocked flags |
2472 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2473 | * insync - sets Insync providing device isn't active |
f466722c N |
2474 | * -insync - clear Insync for a device with a slot assigned, |
2475 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2476 | * write_error - sets WriteErrorSeen |
2477 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2478 | */ |
2479 | int err = -EINVAL; | |
2480 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2481 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2482 | if (test_bit(Faulty, &rdev->flags)) |
2483 | err = 0; | |
2484 | else | |
2485 | err = -EBUSY; | |
45dc2de1 N |
2486 | } else if (cmd_match(buf, "remove")) { |
2487 | if (rdev->raid_disk >= 0) | |
2488 | err = -EBUSY; | |
2489 | else { | |
fd01b88c | 2490 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2491 | kick_rdev_from_array(rdev); |
3f9d7b0d N |
2492 | if (mddev->pers) |
2493 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2494 | md_new_event(mddev); |
2495 | err = 0; | |
2496 | } | |
f655675b N |
2497 | } else if (cmd_match(buf, "writemostly")) { |
2498 | set_bit(WriteMostly, &rdev->flags); | |
2499 | err = 0; | |
2500 | } else if (cmd_match(buf, "-writemostly")) { | |
2501 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2502 | err = 0; |
2503 | } else if (cmd_match(buf, "blocked")) { | |
2504 | set_bit(Blocked, &rdev->flags); | |
2505 | err = 0; | |
2506 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2507 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2508 | rdev->badblocks.unacked_exist) { |
de393cde N |
2509 | /* metadata handler doesn't understand badblocks, |
2510 | * so we need to fail the device | |
2511 | */ | |
2512 | md_error(rdev->mddev, rdev); | |
2513 | } | |
6bfe0b49 | 2514 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2515 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2516 | wake_up(&rdev->blocked_wait); |
2517 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2518 | md_wakeup_thread(rdev->mddev->thread); | |
2519 | ||
6d56e278 N |
2520 | err = 0; |
2521 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2522 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2523 | err = 0; |
f466722c | 2524 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) { |
e1960f8c N |
2525 | if (rdev->mddev->pers == NULL) { |
2526 | clear_bit(In_sync, &rdev->flags); | |
2527 | rdev->saved_raid_disk = rdev->raid_disk; | |
2528 | rdev->raid_disk = -1; | |
2529 | err = 0; | |
2530 | } | |
d7a9d443 N |
2531 | } else if (cmd_match(buf, "write_error")) { |
2532 | set_bit(WriteErrorSeen, &rdev->flags); | |
2533 | err = 0; | |
2534 | } else if (cmd_match(buf, "-write_error")) { | |
2535 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2536 | err = 0; | |
2d78f8c4 N |
2537 | } else if (cmd_match(buf, "want_replacement")) { |
2538 | /* Any non-spare device that is not a replacement can | |
2539 | * become want_replacement at any time, but we then need to | |
2540 | * check if recovery is needed. | |
2541 | */ | |
2542 | if (rdev->raid_disk >= 0 && | |
2543 | !test_bit(Replacement, &rdev->flags)) | |
2544 | set_bit(WantReplacement, &rdev->flags); | |
2545 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2546 | md_wakeup_thread(rdev->mddev->thread); | |
2547 | err = 0; | |
2548 | } else if (cmd_match(buf, "-want_replacement")) { | |
2549 | /* Clearing 'want_replacement' is always allowed. | |
2550 | * Once replacements starts it is too late though. | |
2551 | */ | |
2552 | err = 0; | |
2553 | clear_bit(WantReplacement, &rdev->flags); | |
2554 | } else if (cmd_match(buf, "replacement")) { | |
2555 | /* Can only set a device as a replacement when array has not | |
2556 | * yet been started. Once running, replacement is automatic | |
2557 | * from spares, or by assigning 'slot'. | |
2558 | */ | |
2559 | if (rdev->mddev->pers) | |
2560 | err = -EBUSY; | |
2561 | else { | |
2562 | set_bit(Replacement, &rdev->flags); | |
2563 | err = 0; | |
2564 | } | |
2565 | } else if (cmd_match(buf, "-replacement")) { | |
2566 | /* Similarly, can only clear Replacement before start */ | |
2567 | if (rdev->mddev->pers) | |
2568 | err = -EBUSY; | |
2569 | else { | |
2570 | clear_bit(Replacement, &rdev->flags); | |
2571 | err = 0; | |
2572 | } | |
45dc2de1 | 2573 | } |
00bcb4ac N |
2574 | if (!err) |
2575 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2576 | return err ? err : len; |
2577 | } | |
80ca3a44 N |
2578 | static struct rdev_sysfs_entry rdev_state = |
2579 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2580 | |
4dbcdc75 | 2581 | static ssize_t |
3cb03002 | 2582 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2583 | { |
2584 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2585 | } | |
2586 | ||
2587 | static ssize_t | |
3cb03002 | 2588 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 N |
2589 | { |
2590 | char *e; | |
2591 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2592 | if (*buf && (*e == 0 || *e == '\n')) { | |
2593 | atomic_set(&rdev->corrected_errors, n); | |
2594 | return len; | |
2595 | } | |
2596 | return -EINVAL; | |
2597 | } | |
2598 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2599 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2600 | |
014236d2 | 2601 | static ssize_t |
3cb03002 | 2602 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2603 | { |
2604 | if (rdev->raid_disk < 0) | |
2605 | return sprintf(page, "none\n"); | |
2606 | else | |
2607 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2608 | } | |
2609 | ||
2610 | static ssize_t | |
3cb03002 | 2611 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 N |
2612 | { |
2613 | char *e; | |
c303da6d | 2614 | int err; |
014236d2 N |
2615 | int slot = simple_strtoul(buf, &e, 10); |
2616 | if (strncmp(buf, "none", 4)==0) | |
2617 | slot = -1; | |
2618 | else if (e==buf || (*e && *e!= '\n')) | |
2619 | return -EINVAL; | |
6c2fce2e | 2620 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2621 | /* Setting 'slot' on an active array requires also |
2622 | * updating the 'rd%d' link, and communicating | |
2623 | * with the personality with ->hot_*_disk. | |
2624 | * For now we only support removing | |
2625 | * failed/spare devices. This normally happens automatically, | |
2626 | * but not when the metadata is externally managed. | |
2627 | */ | |
c303da6d N |
2628 | if (rdev->raid_disk == -1) |
2629 | return -EEXIST; | |
2630 | /* personality does all needed checks */ | |
01393f3d | 2631 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2632 | return -EINVAL; |
746d3207 N |
2633 | clear_bit(Blocked, &rdev->flags); |
2634 | remove_and_add_spares(rdev->mddev, rdev); | |
2635 | if (rdev->raid_disk >= 0) | |
2636 | return -EBUSY; | |
c303da6d N |
2637 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2638 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2639 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2640 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2641 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2642 | */ |
2643 | ||
2644 | if (rdev->raid_disk != -1) | |
2645 | return -EBUSY; | |
2646 | ||
c6751b2b N |
2647 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2648 | return -EBUSY; | |
2649 | ||
6c2fce2e NB |
2650 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2651 | return -EINVAL; | |
2652 | ||
ba1b41b6 N |
2653 | if (slot >= rdev->mddev->raid_disks && |
2654 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2655 | return -ENOSPC; | |
2656 | ||
6c2fce2e NB |
2657 | rdev->raid_disk = slot; |
2658 | if (test_bit(In_sync, &rdev->flags)) | |
2659 | rdev->saved_raid_disk = slot; | |
2660 | else | |
2661 | rdev->saved_raid_disk = -1; | |
d30519fc | 2662 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2663 | clear_bit(Bitmap_sync, &rdev->flags); |
6c2fce2e NB |
2664 | err = rdev->mddev->pers-> |
2665 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2666 | if (err) { |
6c2fce2e | 2667 | rdev->raid_disk = -1; |
6c2fce2e | 2668 | return err; |
52664732 | 2669 | } else |
00bcb4ac | 2670 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2671 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2672 | /* failure here is OK */; |
6c2fce2e | 2673 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2674 | } else { |
ba1b41b6 N |
2675 | if (slot >= rdev->mddev->raid_disks && |
2676 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2677 | return -ENOSPC; |
2678 | rdev->raid_disk = slot; | |
2679 | /* assume it is working */ | |
c5d79adb N |
2680 | clear_bit(Faulty, &rdev->flags); |
2681 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2682 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2683 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2684 | } |
014236d2 N |
2685 | return len; |
2686 | } | |
2687 | ||
014236d2 | 2688 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2689 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2690 | |
93c8cad0 | 2691 | static ssize_t |
3cb03002 | 2692 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2693 | { |
6961ece4 | 2694 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2695 | } |
2696 | ||
2697 | static ssize_t | |
3cb03002 | 2698 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2699 | { |
c6563a8c | 2700 | unsigned long long offset; |
b29bebd6 | 2701 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 2702 | return -EINVAL; |
8ed0a521 | 2703 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2704 | return -EBUSY; |
dd8ac336 | 2705 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2706 | /* Must set offset before size, so overlap checks |
2707 | * can be sane */ | |
2708 | return -EBUSY; | |
93c8cad0 | 2709 | rdev->data_offset = offset; |
25f7fd47 | 2710 | rdev->new_data_offset = offset; |
93c8cad0 N |
2711 | return len; |
2712 | } | |
2713 | ||
2714 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2715 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2716 | |
c6563a8c N |
2717 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2718 | { | |
2719 | return sprintf(page, "%llu\n", | |
2720 | (unsigned long long)rdev->new_data_offset); | |
2721 | } | |
2722 | ||
2723 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2724 | const char *buf, size_t len) | |
2725 | { | |
2726 | unsigned long long new_offset; | |
2727 | struct mddev *mddev = rdev->mddev; | |
2728 | ||
b29bebd6 | 2729 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
2730 | return -EINVAL; |
2731 | ||
f851b60d N |
2732 | if (mddev->sync_thread || |
2733 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
2734 | return -EBUSY; |
2735 | if (new_offset == rdev->data_offset) | |
2736 | /* reset is always permitted */ | |
2737 | ; | |
2738 | else if (new_offset > rdev->data_offset) { | |
2739 | /* must not push array size beyond rdev_sectors */ | |
2740 | if (new_offset - rdev->data_offset | |
2741 | + mddev->dev_sectors > rdev->sectors) | |
2742 | return -E2BIG; | |
2743 | } | |
2744 | /* Metadata worries about other space details. */ | |
2745 | ||
2746 | /* decreasing the offset is inconsistent with a backwards | |
2747 | * reshape. | |
2748 | */ | |
2749 | if (new_offset < rdev->data_offset && | |
2750 | mddev->reshape_backwards) | |
2751 | return -EINVAL; | |
2752 | /* Increasing offset is inconsistent with forwards | |
2753 | * reshape. reshape_direction should be set to | |
2754 | * 'backwards' first. | |
2755 | */ | |
2756 | if (new_offset > rdev->data_offset && | |
2757 | !mddev->reshape_backwards) | |
2758 | return -EINVAL; | |
2759 | ||
2760 | if (mddev->pers && mddev->persistent && | |
2761 | !super_types[mddev->major_version] | |
2762 | .allow_new_offset(rdev, new_offset)) | |
2763 | return -E2BIG; | |
2764 | rdev->new_data_offset = new_offset; | |
2765 | if (new_offset > rdev->data_offset) | |
2766 | mddev->reshape_backwards = 1; | |
2767 | else if (new_offset < rdev->data_offset) | |
2768 | mddev->reshape_backwards = 0; | |
2769 | ||
2770 | return len; | |
2771 | } | |
2772 | static struct rdev_sysfs_entry rdev_new_offset = | |
2773 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2774 | ||
83303b61 | 2775 | static ssize_t |
3cb03002 | 2776 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2777 | { |
dd8ac336 | 2778 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2779 | } |
2780 | ||
c5d79adb N |
2781 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2782 | { | |
2783 | /* check if two start/length pairs overlap */ | |
2784 | if (s1+l1 <= s2) | |
2785 | return 0; | |
2786 | if (s2+l2 <= s1) | |
2787 | return 0; | |
2788 | return 1; | |
2789 | } | |
2790 | ||
b522adcd DW |
2791 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2792 | { | |
2793 | unsigned long long blocks; | |
2794 | sector_t new; | |
2795 | ||
b29bebd6 | 2796 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
2797 | return -EINVAL; |
2798 | ||
2799 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2800 | return -EINVAL; /* sector conversion overflow */ | |
2801 | ||
2802 | new = blocks * 2; | |
2803 | if (new != blocks * 2) | |
2804 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2805 | ||
2806 | *sectors = new; | |
2807 | return 0; | |
2808 | } | |
2809 | ||
83303b61 | 2810 | static ssize_t |
3cb03002 | 2811 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2812 | { |
fd01b88c | 2813 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2814 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2815 | sector_t sectors; |
27c529bb | 2816 | |
b522adcd | 2817 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2818 | return -EINVAL; |
c6563a8c N |
2819 | if (rdev->data_offset != rdev->new_data_offset) |
2820 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2821 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2822 | if (my_mddev->persistent) { |
dd8ac336 AN |
2823 | sectors = super_types[my_mddev->major_version]. |
2824 | rdev_size_change(rdev, sectors); | |
2825 | if (!sectors) | |
0cd17fec | 2826 | return -EBUSY; |
dd8ac336 | 2827 | } else if (!sectors) |
77304d2a | 2828 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2829 | rdev->data_offset; |
a6468539 N |
2830 | if (!my_mddev->pers->resize) |
2831 | /* Cannot change size for RAID0 or Linear etc */ | |
2832 | return -EINVAL; | |
0cd17fec | 2833 | } |
dd8ac336 | 2834 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2835 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2836 | |
dd8ac336 AN |
2837 | rdev->sectors = sectors; |
2838 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
2839 | /* Need to check that all other rdevs with the same |
2840 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
2841 | * the rdev lists safely. | |
2842 | * This check does not provide a hard guarantee, it | |
2843 | * just helps avoid dangerous mistakes. | |
c5d79adb | 2844 | */ |
fd01b88c | 2845 | struct mddev *mddev; |
c5d79adb | 2846 | int overlap = 0; |
159ec1fc | 2847 | struct list_head *tmp; |
c5d79adb | 2848 | |
8b1afc3d | 2849 | rcu_read_lock(); |
29ac4aa3 | 2850 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2851 | struct md_rdev *rdev2; |
c5d79adb | 2852 | |
dafb20fa | 2853 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
2854 | if (rdev->bdev == rdev2->bdev && |
2855 | rdev != rdev2 && | |
2856 | overlaps(rdev->data_offset, rdev->sectors, | |
2857 | rdev2->data_offset, | |
2858 | rdev2->sectors)) { | |
c5d79adb N |
2859 | overlap = 1; |
2860 | break; | |
2861 | } | |
c5d79adb N |
2862 | if (overlap) { |
2863 | mddev_put(mddev); | |
2864 | break; | |
2865 | } | |
2866 | } | |
8b1afc3d | 2867 | rcu_read_unlock(); |
c5d79adb N |
2868 | if (overlap) { |
2869 | /* Someone else could have slipped in a size | |
2870 | * change here, but doing so is just silly. | |
dd8ac336 | 2871 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2872 | * safe, and trust userspace not to race with |
2873 | * itself | |
2874 | */ | |
dd8ac336 | 2875 | rdev->sectors = oldsectors; |
c5d79adb N |
2876 | return -EBUSY; |
2877 | } | |
2878 | } | |
83303b61 N |
2879 | return len; |
2880 | } | |
2881 | ||
2882 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2883 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2884 | |
3cb03002 | 2885 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
2886 | { |
2887 | unsigned long long recovery_start = rdev->recovery_offset; | |
2888 | ||
2889 | if (test_bit(In_sync, &rdev->flags) || | |
2890 | recovery_start == MaxSector) | |
2891 | return sprintf(page, "none\n"); | |
2892 | ||
2893 | return sprintf(page, "%llu\n", recovery_start); | |
2894 | } | |
2895 | ||
3cb03002 | 2896 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
2897 | { |
2898 | unsigned long long recovery_start; | |
2899 | ||
2900 | if (cmd_match(buf, "none")) | |
2901 | recovery_start = MaxSector; | |
b29bebd6 | 2902 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
2903 | return -EINVAL; |
2904 | ||
2905 | if (rdev->mddev->pers && | |
2906 | rdev->raid_disk >= 0) | |
2907 | return -EBUSY; | |
2908 | ||
2909 | rdev->recovery_offset = recovery_start; | |
2910 | if (recovery_start == MaxSector) | |
2911 | set_bit(In_sync, &rdev->flags); | |
2912 | else | |
2913 | clear_bit(In_sync, &rdev->flags); | |
2914 | return len; | |
2915 | } | |
2916 | ||
2917 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2918 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2919 | ||
16c791a5 N |
2920 | static ssize_t |
2921 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2922 | static ssize_t | |
2923 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2924 | ||
3cb03002 | 2925 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2926 | { |
2927 | return badblocks_show(&rdev->badblocks, page, 0); | |
2928 | } | |
3cb03002 | 2929 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 2930 | { |
de393cde N |
2931 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
2932 | /* Maybe that ack was all we needed */ | |
2933 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
2934 | wake_up(&rdev->blocked_wait); | |
2935 | return rv; | |
16c791a5 N |
2936 | } |
2937 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2938 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2939 | ||
3cb03002 | 2940 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2941 | { |
2942 | return badblocks_show(&rdev->badblocks, page, 1); | |
2943 | } | |
3cb03002 | 2944 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
2945 | { |
2946 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2947 | } | |
2948 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
2949 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
2950 | ||
86e6ffdd N |
2951 | static struct attribute *rdev_default_attrs[] = { |
2952 | &rdev_state.attr, | |
4dbcdc75 | 2953 | &rdev_errors.attr, |
014236d2 | 2954 | &rdev_slot.attr, |
93c8cad0 | 2955 | &rdev_offset.attr, |
c6563a8c | 2956 | &rdev_new_offset.attr, |
83303b61 | 2957 | &rdev_size.attr, |
06e3c817 | 2958 | &rdev_recovery_start.attr, |
16c791a5 N |
2959 | &rdev_bad_blocks.attr, |
2960 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
2961 | NULL, |
2962 | }; | |
2963 | static ssize_t | |
2964 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2965 | { | |
2966 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2967 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
fd01b88c | 2968 | struct mddev *mddev = rdev->mddev; |
27c529bb | 2969 | ssize_t rv; |
86e6ffdd N |
2970 | |
2971 | if (!entry->show) | |
2972 | return -EIO; | |
27c529bb N |
2973 | |
2974 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2975 | if (!rv) { | |
2976 | if (rdev->mddev == NULL) | |
2977 | rv = -EBUSY; | |
2978 | else | |
2979 | rv = entry->show(rdev, page); | |
2980 | mddev_unlock(mddev); | |
2981 | } | |
2982 | return rv; | |
86e6ffdd N |
2983 | } |
2984 | ||
2985 | static ssize_t | |
2986 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2987 | const char *page, size_t length) | |
2988 | { | |
2989 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2990 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 2991 | ssize_t rv; |
fd01b88c | 2992 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
2993 | |
2994 | if (!entry->store) | |
2995 | return -EIO; | |
67463acb N |
2996 | if (!capable(CAP_SYS_ADMIN)) |
2997 | return -EACCES; | |
27c529bb | 2998 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2999 | if (!rv) { |
27c529bb N |
3000 | if (rdev->mddev == NULL) |
3001 | rv = -EBUSY; | |
3002 | else | |
3003 | rv = entry->store(rdev, page, length); | |
6a51830e | 3004 | mddev_unlock(mddev); |
ca388059 N |
3005 | } |
3006 | return rv; | |
86e6ffdd N |
3007 | } |
3008 | ||
3009 | static void rdev_free(struct kobject *ko) | |
3010 | { | |
3cb03002 | 3011 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3012 | kfree(rdev); |
3013 | } | |
52cf25d0 | 3014 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3015 | .show = rdev_attr_show, |
3016 | .store = rdev_attr_store, | |
3017 | }; | |
3018 | static struct kobj_type rdev_ktype = { | |
3019 | .release = rdev_free, | |
3020 | .sysfs_ops = &rdev_sysfs_ops, | |
3021 | .default_attrs = rdev_default_attrs, | |
3022 | }; | |
3023 | ||
3cb03002 | 3024 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3025 | { |
3026 | rdev->desc_nr = -1; | |
3027 | rdev->saved_raid_disk = -1; | |
3028 | rdev->raid_disk = -1; | |
3029 | rdev->flags = 0; | |
3030 | rdev->data_offset = 0; | |
c6563a8c | 3031 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3032 | rdev->sb_events = 0; |
3033 | rdev->last_read_error.tv_sec = 0; | |
3034 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3035 | rdev->sb_loaded = 0; |
3036 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3037 | atomic_set(&rdev->nr_pending, 0); |
3038 | atomic_set(&rdev->read_errors, 0); | |
3039 | atomic_set(&rdev->corrected_errors, 0); | |
3040 | ||
3041 | INIT_LIST_HEAD(&rdev->same_set); | |
3042 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3043 | |
3044 | /* Add space to store bad block list. | |
3045 | * This reserves the space even on arrays where it cannot | |
3046 | * be used - I wonder if that matters | |
3047 | */ | |
3048 | rdev->badblocks.count = 0; | |
486adf72 | 3049 | rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
2230dfe4 N |
3050 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3051 | seqlock_init(&rdev->badblocks.lock); | |
3052 | if (rdev->badblocks.page == NULL) | |
3053 | return -ENOMEM; | |
3054 | ||
3055 | return 0; | |
e8bb9a83 N |
3056 | } |
3057 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3058 | /* |
3059 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3060 | * | |
3061 | * mark the device faulty if: | |
3062 | * | |
3063 | * - the device is nonexistent (zero size) | |
3064 | * - the device has no valid superblock | |
3065 | * | |
3066 | * a faulty rdev _never_ has rdev->sb set. | |
3067 | */ | |
3cb03002 | 3068 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3069 | { |
3070 | char b[BDEVNAME_SIZE]; | |
3071 | int err; | |
3cb03002 | 3072 | struct md_rdev *rdev; |
1da177e4 LT |
3073 | sector_t size; |
3074 | ||
9ffae0cf | 3075 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3076 | if (!rdev) { |
3077 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3078 | return ERR_PTR(-ENOMEM); | |
3079 | } | |
1da177e4 | 3080 | |
2230dfe4 N |
3081 | err = md_rdev_init(rdev); |
3082 | if (err) | |
3083 | goto abort_free; | |
3084 | err = alloc_disk_sb(rdev); | |
3085 | if (err) | |
1da177e4 LT |
3086 | goto abort_free; |
3087 | ||
c5d79adb | 3088 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3089 | if (err) |
3090 | goto abort_free; | |
3091 | ||
f9cb074b | 3092 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3093 | |
77304d2a | 3094 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3095 | if (!size) { |
f72ffdd6 | 3096 | printk(KERN_WARNING |
1da177e4 LT |
3097 | "md: %s has zero or unknown size, marking faulty!\n", |
3098 | bdevname(rdev->bdev,b)); | |
3099 | err = -EINVAL; | |
3100 | goto abort_free; | |
3101 | } | |
3102 | ||
3103 | if (super_format >= 0) { | |
3104 | err = super_types[super_format]. | |
3105 | load_super(rdev, NULL, super_minor); | |
3106 | if (err == -EINVAL) { | |
df968c4e N |
3107 | printk(KERN_WARNING |
3108 | "md: %s does not have a valid v%d.%d " | |
3109 | "superblock, not importing!\n", | |
3110 | bdevname(rdev->bdev,b), | |
3111 | super_format, super_minor); | |
1da177e4 LT |
3112 | goto abort_free; |
3113 | } | |
3114 | if (err < 0) { | |
f72ffdd6 | 3115 | printk(KERN_WARNING |
1da177e4 LT |
3116 | "md: could not read %s's sb, not importing!\n", |
3117 | bdevname(rdev->bdev,b)); | |
3118 | goto abort_free; | |
3119 | } | |
3120 | } | |
6bfe0b49 | 3121 | |
1da177e4 LT |
3122 | return rdev; |
3123 | ||
3124 | abort_free: | |
2699b672 N |
3125 | if (rdev->bdev) |
3126 | unlock_rdev(rdev); | |
545c8795 | 3127 | md_rdev_clear(rdev); |
1da177e4 LT |
3128 | kfree(rdev); |
3129 | return ERR_PTR(err); | |
3130 | } | |
3131 | ||
3132 | /* | |
3133 | * Check a full RAID array for plausibility | |
3134 | */ | |
3135 | ||
f72ffdd6 | 3136 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3137 | { |
3138 | int i; | |
3cb03002 | 3139 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3140 | char b[BDEVNAME_SIZE]; |
3141 | ||
3142 | freshest = NULL; | |
dafb20fa | 3143 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3144 | switch (super_types[mddev->major_version]. |
3145 | load_super(rdev, freshest, mddev->minor_version)) { | |
3146 | case 1: | |
3147 | freshest = rdev; | |
3148 | break; | |
3149 | case 0: | |
3150 | break; | |
3151 | default: | |
3152 | printk( KERN_ERR \ | |
3153 | "md: fatal superblock inconsistency in %s" | |
f72ffdd6 | 3154 | " -- removing from array\n", |
1da177e4 LT |
3155 | bdevname(rdev->bdev,b)); |
3156 | kick_rdev_from_array(rdev); | |
3157 | } | |
3158 | ||
1da177e4 LT |
3159 | super_types[mddev->major_version]. |
3160 | validate_super(mddev, freshest); | |
3161 | ||
3162 | i = 0; | |
dafb20fa | 3163 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3164 | if (mddev->max_disks && |
3165 | (rdev->desc_nr >= mddev->max_disks || | |
3166 | i > mddev->max_disks)) { | |
de01dfad N |
3167 | printk(KERN_WARNING |
3168 | "md: %s: %s: only %d devices permitted\n", | |
3169 | mdname(mddev), bdevname(rdev->bdev, b), | |
3170 | mddev->max_disks); | |
3171 | kick_rdev_from_array(rdev); | |
3172 | continue; | |
3173 | } | |
1da177e4 LT |
3174 | if (rdev != freshest) |
3175 | if (super_types[mddev->major_version]. | |
3176 | validate_super(mddev, rdev)) { | |
3177 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3178 | " from array!\n", | |
3179 | bdevname(rdev->bdev,b)); | |
3180 | kick_rdev_from_array(rdev); | |
3181 | continue; | |
3182 | } | |
3183 | if (mddev->level == LEVEL_MULTIPATH) { | |
3184 | rdev->desc_nr = i++; | |
3185 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3186 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3187 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3188 | rdev->raid_disk = -1; |
3189 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3190 | } |
3191 | } | |
1da177e4 LT |
3192 | } |
3193 | ||
72e02075 N |
3194 | /* Read a fixed-point number. |
3195 | * Numbers in sysfs attributes should be in "standard" units where | |
3196 | * possible, so time should be in seconds. | |
f72ffdd6 | 3197 | * However we internally use a a much smaller unit such as |
72e02075 N |
3198 | * milliseconds or jiffies. |
3199 | * This function takes a decimal number with a possible fractional | |
3200 | * component, and produces an integer which is the result of | |
3201 | * multiplying that number by 10^'scale'. | |
3202 | * all without any floating-point arithmetic. | |
3203 | */ | |
3204 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3205 | { | |
3206 | unsigned long result = 0; | |
3207 | long decimals = -1; | |
3208 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3209 | if (*cp == '.') | |
3210 | decimals = 0; | |
3211 | else if (decimals < scale) { | |
3212 | unsigned int value; | |
3213 | value = *cp - '0'; | |
3214 | result = result * 10 + value; | |
3215 | if (decimals >= 0) | |
3216 | decimals++; | |
3217 | } | |
3218 | cp++; | |
3219 | } | |
3220 | if (*cp == '\n') | |
3221 | cp++; | |
3222 | if (*cp) | |
3223 | return -EINVAL; | |
3224 | if (decimals < 0) | |
3225 | decimals = 0; | |
3226 | while (decimals < scale) { | |
3227 | result *= 10; | |
3228 | decimals ++; | |
3229 | } | |
3230 | *res = result; | |
3231 | return 0; | |
3232 | } | |
3233 | ||
19052c0e N |
3234 | static void md_safemode_timeout(unsigned long data); |
3235 | ||
16f17b39 | 3236 | static ssize_t |
fd01b88c | 3237 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3238 | { |
3239 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3240 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3241 | } | |
3242 | static ssize_t | |
fd01b88c | 3243 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3244 | { |
16f17b39 | 3245 | unsigned long msec; |
97ce0a7f | 3246 | |
72e02075 | 3247 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3248 | return -EINVAL; |
16f17b39 N |
3249 | if (msec == 0) |
3250 | mddev->safemode_delay = 0; | |
3251 | else { | |
19052c0e | 3252 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
3253 | mddev->safemode_delay = (msec*HZ)/1000; |
3254 | if (mddev->safemode_delay == 0) | |
3255 | mddev->safemode_delay = 1; | |
275c51c4 | 3256 | if (mddev->safemode_delay < old_delay || old_delay == 0) |
19052c0e | 3257 | md_safemode_timeout((unsigned long)mddev); |
16f17b39 N |
3258 | } |
3259 | return len; | |
3260 | } | |
3261 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3262 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3263 | |
eae1701f | 3264 | static ssize_t |
fd01b88c | 3265 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3266 | { |
84fc4b56 | 3267 | struct md_personality *p = mddev->pers; |
d9d166c2 | 3268 | if (p) |
eae1701f | 3269 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
3270 | else if (mddev->clevel[0]) |
3271 | return sprintf(page, "%s\n", mddev->clevel); | |
3272 | else if (mddev->level != LEVEL_NONE) | |
3273 | return sprintf(page, "%d\n", mddev->level); | |
3274 | else | |
3275 | return 0; | |
eae1701f N |
3276 | } |
3277 | ||
d9d166c2 | 3278 | static ssize_t |
fd01b88c | 3279 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3280 | { |
f2859af6 | 3281 | char clevel[16]; |
20a49ff6 | 3282 | ssize_t rv = len; |
84fc4b56 | 3283 | struct md_personality *pers; |
f2859af6 | 3284 | long level; |
245f46c2 | 3285 | void *priv; |
3cb03002 | 3286 | struct md_rdev *rdev; |
245f46c2 N |
3287 | |
3288 | if (mddev->pers == NULL) { | |
3289 | if (len == 0) | |
3290 | return 0; | |
3291 | if (len >= sizeof(mddev->clevel)) | |
3292 | return -ENOSPC; | |
3293 | strncpy(mddev->clevel, buf, len); | |
3294 | if (mddev->clevel[len-1] == '\n') | |
3295 | len--; | |
3296 | mddev->clevel[len] = 0; | |
3297 | mddev->level = LEVEL_NONE; | |
3298 | return rv; | |
3299 | } | |
bd8839e0 N |
3300 | if (mddev->ro) |
3301 | return -EROFS; | |
245f46c2 N |
3302 | |
3303 | /* request to change the personality. Need to ensure: | |
3304 | * - array is not engaged in resync/recovery/reshape | |
3305 | * - old personality can be suspended | |
3306 | * - new personality will access other array. | |
3307 | */ | |
3308 | ||
bb4f1e9d | 3309 | if (mddev->sync_thread || |
f851b60d | 3310 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3311 | mddev->reshape_position != MaxSector || |
3312 | mddev->sysfs_active) | |
d9d166c2 | 3313 | return -EBUSY; |
245f46c2 N |
3314 | |
3315 | if (!mddev->pers->quiesce) { | |
3316 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3317 | mdname(mddev), mddev->pers->name); | |
3318 | return -EINVAL; | |
3319 | } | |
3320 | ||
3321 | /* Now find the new personality */ | |
f2859af6 | 3322 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3323 | return -EINVAL; |
f2859af6 DW |
3324 | strncpy(clevel, buf, len); |
3325 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3326 | len--; |
f2859af6 | 3327 | clevel[len] = 0; |
b29bebd6 | 3328 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3329 | level = LEVEL_NONE; |
245f46c2 | 3330 | |
f2859af6 DW |
3331 | if (request_module("md-%s", clevel) != 0) |
3332 | request_module("md-level-%s", clevel); | |
245f46c2 | 3333 | spin_lock(&pers_lock); |
f2859af6 | 3334 | pers = find_pers(level, clevel); |
245f46c2 N |
3335 | if (!pers || !try_module_get(pers->owner)) { |
3336 | spin_unlock(&pers_lock); | |
f2859af6 | 3337 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3338 | return -EINVAL; |
3339 | } | |
3340 | spin_unlock(&pers_lock); | |
3341 | ||
3342 | if (pers == mddev->pers) { | |
3343 | /* Nothing to do! */ | |
3344 | module_put(pers->owner); | |
3345 | return rv; | |
3346 | } | |
3347 | if (!pers->takeover) { | |
3348 | module_put(pers->owner); | |
3349 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3350 | mdname(mddev), clevel); |
245f46c2 N |
3351 | return -EINVAL; |
3352 | } | |
3353 | ||
dafb20fa | 3354 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3355 | rdev->new_raid_disk = rdev->raid_disk; |
3356 | ||
245f46c2 N |
3357 | /* ->takeover must set new_* and/or delta_disks |
3358 | * if it succeeds, and may set them when it fails. | |
3359 | */ | |
3360 | priv = pers->takeover(mddev); | |
3361 | if (IS_ERR(priv)) { | |
3362 | mddev->new_level = mddev->level; | |
3363 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3364 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3365 | mddev->raid_disks -= mddev->delta_disks; |
3366 | mddev->delta_disks = 0; | |
2c810cdd | 3367 | mddev->reshape_backwards = 0; |
245f46c2 N |
3368 | module_put(pers->owner); |
3369 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3370 | mdname(mddev), clevel); |
245f46c2 N |
3371 | return PTR_ERR(priv); |
3372 | } | |
3373 | ||
3374 | /* Looks like we have a winner */ | |
3375 | mddev_suspend(mddev); | |
5aa61f42 | 3376 | mddev_detach(mddev); |
afa0f557 | 3377 | mddev->pers->free(mddev, mddev->private); |
f72ffdd6 | 3378 | |
a64c876f N |
3379 | if (mddev->pers->sync_request == NULL && |
3380 | pers->sync_request != NULL) { | |
3381 | /* need to add the md_redundancy_group */ | |
3382 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3383 | printk(KERN_WARNING | |
3384 | "md: cannot register extra attributes for %s\n", | |
3385 | mdname(mddev)); | |
388975cc | 3386 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3387 | } |
a64c876f N |
3388 | if (mddev->pers->sync_request != NULL && |
3389 | pers->sync_request == NULL) { | |
3390 | /* need to remove the md_redundancy_group */ | |
3391 | if (mddev->to_remove == NULL) | |
3392 | mddev->to_remove = &md_redundancy_group; | |
3393 | } | |
3394 | ||
54071b38 TM |
3395 | if (mddev->pers->sync_request == NULL && |
3396 | mddev->external) { | |
3397 | /* We are converting from a no-redundancy array | |
3398 | * to a redundancy array and metadata is managed | |
3399 | * externally so we need to be sure that writes | |
3400 | * won't block due to a need to transition | |
3401 | * clean->dirty | |
3402 | * until external management is started. | |
3403 | */ | |
3404 | mddev->in_sync = 0; | |
3405 | mddev->safemode_delay = 0; | |
3406 | mddev->safemode = 0; | |
3407 | } | |
3408 | ||
dafb20fa | 3409 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3410 | if (rdev->raid_disk < 0) |
3411 | continue; | |
bf2cb0da | 3412 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3413 | rdev->new_raid_disk = -1; |
3414 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3415 | continue; | |
36fad858 | 3416 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3417 | } |
dafb20fa | 3418 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3419 | if (rdev->raid_disk < 0) |
3420 | continue; | |
3421 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3422 | continue; | |
3423 | rdev->raid_disk = rdev->new_raid_disk; | |
3424 | if (rdev->raid_disk < 0) | |
3a981b03 | 3425 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3426 | else { |
36fad858 NK |
3427 | if (sysfs_link_rdev(mddev, rdev)) |
3428 | printk(KERN_WARNING "md: cannot register rd%d" | |
3429 | " for %s after level change\n", | |
3430 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3431 | } |
e93f68a1 N |
3432 | } |
3433 | ||
3434 | module_put(mddev->pers->owner); | |
245f46c2 N |
3435 | mddev->pers = pers; |
3436 | mddev->private = priv; | |
3437 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3438 | mddev->level = mddev->new_level; | |
3439 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3440 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3441 | mddev->delta_disks = 0; |
2c810cdd | 3442 | mddev->reshape_backwards = 0; |
fee68723 | 3443 | mddev->degraded = 0; |
9af204cf TM |
3444 | if (mddev->pers->sync_request == NULL) { |
3445 | /* this is now an array without redundancy, so | |
3446 | * it must always be in_sync | |
3447 | */ | |
3448 | mddev->in_sync = 1; | |
3449 | del_timer_sync(&mddev->safemode_timer); | |
3450 | } | |
02e5f5c0 | 3451 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3452 | pers->run(mddev); |
245f46c2 | 3453 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3454 | mddev_resume(mddev); |
830778a1 N |
3455 | if (!mddev->thread) |
3456 | md_update_sb(mddev, 1); | |
5cac7861 | 3457 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3458 | md_new_event(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); | |
d4dbd025 N |
3481 | |
3482 | if (!*buf || (*e && *e != '\n')) | |
3483 | return -EINVAL; | |
3484 | ||
b3546035 N |
3485 | if (mddev->pers) { |
3486 | int err; | |
50ac168a | 3487 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3488 | return -EBUSY; |
bd8839e0 N |
3489 | if (mddev->ro) |
3490 | return -EROFS; | |
597a711b | 3491 | mddev->new_layout = n; |
50ac168a | 3492 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3493 | if (err) { |
3494 | mddev->new_layout = mddev->layout; | |
b3546035 | 3495 | return err; |
597a711b | 3496 | } |
b3546035 | 3497 | } else { |
08a02ecd | 3498 | mddev->new_layout = n; |
b3546035 N |
3499 | if (mddev->reshape_position == MaxSector) |
3500 | mddev->layout = n; | |
3501 | } | |
d4dbd025 N |
3502 | return len; |
3503 | } | |
3504 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3505 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3506 | |
eae1701f | 3507 | static ssize_t |
fd01b88c | 3508 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3509 | { |
bb636547 N |
3510 | if (mddev->raid_disks == 0) |
3511 | return 0; | |
08a02ecd N |
3512 | if (mddev->reshape_position != MaxSector && |
3513 | mddev->delta_disks != 0) | |
3514 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3515 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3516 | return sprintf(page, "%d\n", mddev->raid_disks); |
3517 | } | |
3518 | ||
fd01b88c | 3519 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3520 | |
3521 | static ssize_t | |
fd01b88c | 3522 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3523 | { |
da943b99 N |
3524 | char *e; |
3525 | int rv = 0; | |
3526 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3527 | ||
3528 | if (!*buf || (*e && *e != '\n')) | |
3529 | return -EINVAL; | |
3530 | ||
3531 | if (mddev->pers) | |
3532 | rv = update_raid_disks(mddev, n); | |
08a02ecd | 3533 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3534 | struct md_rdev *rdev; |
08a02ecd | 3535 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c N |
3536 | |
3537 | rdev_for_each(rdev, mddev) { | |
3538 | if (olddisks < n && | |
3539 | rdev->data_offset < rdev->new_data_offset) | |
3540 | return -EINVAL; | |
3541 | if (olddisks > n && | |
3542 | rdev->data_offset > rdev->new_data_offset) | |
3543 | return -EINVAL; | |
3544 | } | |
08a02ecd N |
3545 | mddev->delta_disks = n - olddisks; |
3546 | mddev->raid_disks = n; | |
2c810cdd | 3547 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3548 | } else |
da943b99 N |
3549 | mddev->raid_disks = n; |
3550 | return rv ? rv : len; | |
3551 | } | |
3552 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3553 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3554 | |
3b34380a | 3555 | static ssize_t |
fd01b88c | 3556 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3557 | { |
08a02ecd | 3558 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3559 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3560 | return sprintf(page, "%d (%d)\n", | |
3561 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3562 | mddev->chunk_sectors << 9); |
3563 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3564 | } |
3565 | ||
3566 | static ssize_t | |
fd01b88c | 3567 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3568 | { |
3b34380a N |
3569 | char *e; |
3570 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3571 | ||
3b34380a N |
3572 | if (!*buf || (*e && *e != '\n')) |
3573 | return -EINVAL; | |
3574 | ||
b3546035 N |
3575 | if (mddev->pers) { |
3576 | int err; | |
50ac168a | 3577 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3578 | return -EBUSY; |
bd8839e0 N |
3579 | if (mddev->ro) |
3580 | return -EROFS; | |
597a711b | 3581 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3582 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3583 | if (err) { |
3584 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3585 | return err; |
597a711b | 3586 | } |
b3546035 | 3587 | } else { |
664e7c41 | 3588 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3589 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3590 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3591 | } |
3b34380a N |
3592 | return len; |
3593 | } | |
3594 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3595 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3596 | |
a94213b1 | 3597 | static ssize_t |
fd01b88c | 3598 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3599 | { |
d1a7c503 N |
3600 | if (mddev->recovery_cp == MaxSector) |
3601 | return sprintf(page, "none\n"); | |
a94213b1 N |
3602 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3603 | } | |
3604 | ||
3605 | static ssize_t | |
fd01b88c | 3606 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3607 | { |
a94213b1 N |
3608 | char *e; |
3609 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3610 | ||
b098636c | 3611 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3612 | return -EBUSY; |
06e3c817 DW |
3613 | if (cmd_match(buf, "none")) |
3614 | n = MaxSector; | |
3615 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3616 | return -EINVAL; |
3617 | ||
3618 | mddev->recovery_cp = n; | |
db07d85e N |
3619 | if (mddev->pers) |
3620 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
a94213b1 N |
3621 | return len; |
3622 | } | |
3623 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3624 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3625 | |
9e653b63 N |
3626 | /* |
3627 | * The array state can be: | |
3628 | * | |
3629 | * clear | |
3630 | * No devices, no size, no level | |
3631 | * Equivalent to STOP_ARRAY ioctl | |
3632 | * inactive | |
3633 | * May have some settings, but array is not active | |
3634 | * all IO results in error | |
3635 | * When written, doesn't tear down array, but just stops it | |
3636 | * suspended (not supported yet) | |
3637 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3638 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3639 | * readonly |
3640 | * no resync can happen. no superblocks get written. | |
3641 | * write requests fail | |
3642 | * read-auto | |
3643 | * like readonly, but behaves like 'clean' on a write request. | |
3644 | * | |
3645 | * clean - no pending writes, but otherwise active. | |
3646 | * When written to inactive array, starts without resync | |
3647 | * If a write request arrives then | |
3648 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3649 | * if not known, block and switch to write-pending | |
3650 | * If written to an active array that has pending writes, then fails. | |
3651 | * active | |
3652 | * fully active: IO and resync can be happening. | |
3653 | * When written to inactive array, starts with resync | |
3654 | * | |
3655 | * write-pending | |
3656 | * clean, but writes are blocked waiting for 'active' to be written. | |
3657 | * | |
3658 | * active-idle | |
3659 | * like active, but no writes have been seen for a while (100msec). | |
3660 | * | |
3661 | */ | |
3662 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3663 | write_pending, active_idle, bad_word}; | |
05381954 | 3664 | static char *array_states[] = { |
9e653b63 N |
3665 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3666 | "write-pending", "active-idle", NULL }; | |
3667 | ||
3668 | static int match_word(const char *word, char **list) | |
3669 | { | |
3670 | int n; | |
3671 | for (n=0; list[n]; n++) | |
3672 | if (cmd_match(word, list[n])) | |
3673 | break; | |
3674 | return n; | |
3675 | } | |
3676 | ||
3677 | static ssize_t | |
fd01b88c | 3678 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3679 | { |
3680 | enum array_state st = inactive; | |
3681 | ||
3682 | if (mddev->pers) | |
3683 | switch(mddev->ro) { | |
3684 | case 1: | |
3685 | st = readonly; | |
3686 | break; | |
3687 | case 2: | |
3688 | st = read_auto; | |
3689 | break; | |
3690 | case 0: | |
3691 | if (mddev->in_sync) | |
3692 | st = clean; | |
070dc6dd | 3693 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3694 | st = write_pending; |
9e653b63 N |
3695 | else if (mddev->safemode) |
3696 | st = active_idle; | |
3697 | else | |
3698 | st = active; | |
3699 | } | |
3700 | else { | |
3701 | if (list_empty(&mddev->disks) && | |
3702 | mddev->raid_disks == 0 && | |
58c0fed4 | 3703 | mddev->dev_sectors == 0) |
9e653b63 N |
3704 | st = clear; |
3705 | else | |
3706 | st = inactive; | |
3707 | } | |
3708 | return sprintf(page, "%s\n", array_states[st]); | |
3709 | } | |
3710 | ||
f72ffdd6 N |
3711 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
3712 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
3713 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 3714 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
3715 | |
3716 | static ssize_t | |
fd01b88c | 3717 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 N |
3718 | { |
3719 | int err = -EINVAL; | |
3720 | enum array_state st = match_word(buf, array_states); | |
3721 | switch(st) { | |
3722 | case bad_word: | |
3723 | break; | |
3724 | case clear: | |
3725 | /* stopping an active array */ | |
a05b7ea0 | 3726 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3727 | break; |
3728 | case inactive: | |
3729 | /* stopping an active array */ | |
90cf195d | 3730 | if (mddev->pers) |
a05b7ea0 | 3731 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3732 | else |
e691063a | 3733 | err = 0; /* already inactive */ |
9e653b63 N |
3734 | break; |
3735 | case suspended: | |
3736 | break; /* not supported yet */ | |
3737 | case readonly: | |
3738 | if (mddev->pers) | |
a05b7ea0 | 3739 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3740 | else { |
3741 | mddev->ro = 1; | |
648b629e | 3742 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3743 | err = do_md_run(mddev); |
3744 | } | |
3745 | break; | |
3746 | case read_auto: | |
9e653b63 | 3747 | if (mddev->pers) { |
80268ee9 | 3748 | if (mddev->ro == 0) |
a05b7ea0 | 3749 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3750 | else if (mddev->ro == 1) |
648b629e N |
3751 | err = restart_array(mddev); |
3752 | if (err == 0) { | |
3753 | mddev->ro = 2; | |
3754 | set_disk_ro(mddev->gendisk, 0); | |
3755 | } | |
9e653b63 N |
3756 | } else { |
3757 | mddev->ro = 2; | |
3758 | err = do_md_run(mddev); | |
3759 | } | |
3760 | break; | |
3761 | case clean: | |
3762 | if (mddev->pers) { | |
3763 | restart_array(mddev); | |
85572d7c | 3764 | spin_lock(&mddev->lock); |
9e653b63 | 3765 | if (atomic_read(&mddev->writes_pending) == 0) { |
e691063a N |
3766 | if (mddev->in_sync == 0) { |
3767 | mddev->in_sync = 1; | |
31a59e34 N |
3768 | if (mddev->safemode == 1) |
3769 | mddev->safemode = 0; | |
070dc6dd | 3770 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3771 | } |
3772 | err = 0; | |
3773 | } else | |
3774 | err = -EBUSY; | |
85572d7c | 3775 | spin_unlock(&mddev->lock); |
5bf29597 N |
3776 | } else |
3777 | err = -EINVAL; | |
9e653b63 N |
3778 | break; |
3779 | case active: | |
3780 | if (mddev->pers) { | |
3781 | restart_array(mddev); | |
070dc6dd | 3782 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3783 | wake_up(&mddev->sb_wait); |
3784 | err = 0; | |
3785 | } else { | |
3786 | mddev->ro = 0; | |
648b629e | 3787 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3788 | err = do_md_run(mddev); |
3789 | } | |
3790 | break; | |
3791 | case write_pending: | |
3792 | case active_idle: | |
3793 | /* these cannot be set */ | |
3794 | break; | |
3795 | } | |
3796 | if (err) | |
3797 | return err; | |
0fd62b86 | 3798 | else { |
1d23f178 N |
3799 | if (mddev->hold_active == UNTIL_IOCTL) |
3800 | mddev->hold_active = 0; | |
00bcb4ac | 3801 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3802 | return len; |
0fd62b86 | 3803 | } |
9e653b63 | 3804 | } |
80ca3a44 N |
3805 | static struct md_sysfs_entry md_array_state = |
3806 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3807 | |
1e50915f | 3808 | static ssize_t |
fd01b88c | 3809 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3810 | return sprintf(page, "%d\n", |
3811 | atomic_read(&mddev->max_corr_read_errors)); | |
3812 | } | |
3813 | ||
3814 | static ssize_t | |
fd01b88c | 3815 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f RB |
3816 | { |
3817 | char *e; | |
3818 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3819 | ||
3820 | if (*buf && (*e == 0 || *e == '\n')) { | |
3821 | atomic_set(&mddev->max_corr_read_errors, n); | |
3822 | return len; | |
3823 | } | |
3824 | return -EINVAL; | |
3825 | } | |
3826 | ||
3827 | static struct md_sysfs_entry max_corr_read_errors = | |
3828 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3829 | max_corrected_read_errors_store); | |
3830 | ||
6d7ff738 | 3831 | static ssize_t |
fd01b88c | 3832 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3833 | { |
3834 | return -EINVAL; | |
3835 | } | |
3836 | ||
3837 | static ssize_t | |
fd01b88c | 3838 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
3839 | { |
3840 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3841 | /* The new device is added to the array. | |
3842 | * If the array has a persistent superblock, we read the | |
3843 | * superblock to initialise info and check validity. | |
3844 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3845 | * which mainly checks size. | |
3846 | */ | |
3847 | char *e; | |
3848 | int major = simple_strtoul(buf, &e, 10); | |
3849 | int minor; | |
3850 | dev_t dev; | |
3cb03002 | 3851 | struct md_rdev *rdev; |
6d7ff738 N |
3852 | int err; |
3853 | ||
3854 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3855 | return -EINVAL; | |
3856 | minor = simple_strtoul(e+1, &e, 10); | |
3857 | if (*e && *e != '\n') | |
3858 | return -EINVAL; | |
3859 | dev = MKDEV(major, minor); | |
3860 | if (major != MAJOR(dev) || | |
3861 | minor != MINOR(dev)) | |
3862 | return -EOVERFLOW; | |
3863 | ||
6d7ff738 N |
3864 | if (mddev->persistent) { |
3865 | rdev = md_import_device(dev, mddev->major_version, | |
3866 | mddev->minor_version); | |
3867 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
3868 | struct md_rdev *rdev0 |
3869 | = list_entry(mddev->disks.next, | |
3870 | struct md_rdev, same_set); | |
6d7ff738 N |
3871 | err = super_types[mddev->major_version] |
3872 | .load_super(rdev, rdev0, mddev->minor_version); | |
3873 | if (err < 0) | |
3874 | goto out; | |
3875 | } | |
c5d79adb N |
3876 | } else if (mddev->external) |
3877 | rdev = md_import_device(dev, -2, -1); | |
3878 | else | |
6d7ff738 N |
3879 | rdev = md_import_device(dev, -1, -1); |
3880 | ||
3881 | if (IS_ERR(rdev)) | |
3882 | return PTR_ERR(rdev); | |
3883 | err = bind_rdev_to_array(rdev, mddev); | |
3884 | out: | |
3885 | if (err) | |
3886 | export_rdev(rdev); | |
3887 | return err ? err : len; | |
3888 | } | |
3889 | ||
3890 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3891 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3892 | |
9b1d1dac | 3893 | static ssize_t |
fd01b88c | 3894 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
3895 | { |
3896 | char *end; | |
3897 | unsigned long chunk, end_chunk; | |
3898 | ||
3899 | if (!mddev->bitmap) | |
3900 | goto out; | |
3901 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3902 | while (*buf) { | |
3903 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3904 | if (buf == end) break; | |
3905 | if (*end == '-') { /* range */ | |
3906 | buf = end + 1; | |
3907 | end_chunk = simple_strtoul(buf, &end, 0); | |
3908 | if (buf == end) break; | |
3909 | } | |
3910 | if (*end && !isspace(*end)) break; | |
3911 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3912 | buf = skip_spaces(end); |
9b1d1dac PC |
3913 | } |
3914 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3915 | out: | |
3916 | return len; | |
3917 | } | |
3918 | ||
3919 | static struct md_sysfs_entry md_bitmap = | |
3920 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3921 | ||
a35b0d69 | 3922 | static ssize_t |
fd01b88c | 3923 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 3924 | { |
58c0fed4 AN |
3925 | return sprintf(page, "%llu\n", |
3926 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3927 | } |
3928 | ||
fd01b88c | 3929 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
3930 | |
3931 | static ssize_t | |
fd01b88c | 3932 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
3933 | { |
3934 | /* If array is inactive, we can reduce the component size, but | |
3935 | * not increase it (except from 0). | |
3936 | * If array is active, we can try an on-line resize | |
3937 | */ | |
b522adcd DW |
3938 | sector_t sectors; |
3939 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3940 | |
58c0fed4 AN |
3941 | if (err < 0) |
3942 | return err; | |
a35b0d69 | 3943 | if (mddev->pers) { |
58c0fed4 | 3944 | err = update_size(mddev, sectors); |
850b2b42 | 3945 | md_update_sb(mddev, 1); |
a35b0d69 | 3946 | } else { |
58c0fed4 AN |
3947 | if (mddev->dev_sectors == 0 || |
3948 | mddev->dev_sectors > sectors) | |
3949 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3950 | else |
3951 | err = -ENOSPC; | |
3952 | } | |
3953 | return err ? err : len; | |
3954 | } | |
3955 | ||
3956 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3957 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3958 | |
83f0d77a | 3959 | /* Metadata version. |
e691063a N |
3960 | * This is one of |
3961 | * 'none' for arrays with no metadata (good luck...) | |
3962 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3963 | * or N.M for internally known formats |
3964 | */ | |
3965 | static ssize_t | |
fd01b88c | 3966 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
3967 | { |
3968 | if (mddev->persistent) | |
3969 | return sprintf(page, "%d.%d\n", | |
3970 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3971 | else if (mddev->external) |
3972 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3973 | else |
3974 | return sprintf(page, "none\n"); | |
3975 | } | |
3976 | ||
3977 | static ssize_t | |
fd01b88c | 3978 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
3979 | { |
3980 | int major, minor; | |
3981 | char *e; | |
ea43ddd8 N |
3982 | /* Changing the details of 'external' metadata is |
3983 | * always permitted. Otherwise there must be | |
3984 | * no devices attached to the array. | |
3985 | */ | |
3986 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3987 | ; | |
3988 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3989 | return -EBUSY; |
3990 | ||
3991 | if (cmd_match(buf, "none")) { | |
3992 | mddev->persistent = 0; | |
e691063a N |
3993 | mddev->external = 0; |
3994 | mddev->major_version = 0; | |
3995 | mddev->minor_version = 90; | |
3996 | return len; | |
3997 | } | |
3998 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3999 | size_t namelen = len-9; |
e691063a N |
4000 | if (namelen >= sizeof(mddev->metadata_type)) |
4001 | namelen = sizeof(mddev->metadata_type)-1; | |
4002 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4003 | mddev->metadata_type[namelen] = 0; | |
4004 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4005 | mddev->metadata_type[--namelen] = 0; | |
4006 | mddev->persistent = 0; | |
4007 | mddev->external = 1; | |
8bb93aac N |
4008 | mddev->major_version = 0; |
4009 | mddev->minor_version = 90; | |
4010 | return len; | |
4011 | } | |
4012 | major = simple_strtoul(buf, &e, 10); | |
4013 | if (e==buf || *e != '.') | |
4014 | return -EINVAL; | |
4015 | buf = e+1; | |
4016 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4017 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 4018 | return -EINVAL; |
50511da3 | 4019 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
4020 | return -ENOENT; |
4021 | mddev->major_version = major; | |
4022 | mddev->minor_version = minor; | |
4023 | mddev->persistent = 1; | |
e691063a | 4024 | mddev->external = 0; |
8bb93aac N |
4025 | return len; |
4026 | } | |
4027 | ||
4028 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 4029 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4030 | |
24dd469d | 4031 | static ssize_t |
fd01b88c | 4032 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4033 | { |
7eec314d | 4034 | char *type = "idle"; |
b6a9ce68 N |
4035 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
4036 | type = "frozen"; | |
4037 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 4038 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
4039 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4040 | type = "reshape"; | |
4041 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
4042 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
4043 | type = "resync"; | |
4044 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
4045 | type = "check"; | |
4046 | else | |
4047 | type = "repair"; | |
72a23c21 | 4048 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
4049 | type = "recover"; |
4050 | } | |
4051 | return sprintf(page, "%s\n", type); | |
4052 | } | |
4053 | ||
4054 | static ssize_t | |
fd01b88c | 4055 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4056 | { |
7eec314d N |
4057 | if (!mddev->pers || !mddev->pers->sync_request) |
4058 | return -EINVAL; | |
4059 | ||
b6a9ce68 N |
4060 | if (cmd_match(page, "frozen")) |
4061 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4062 | else | |
4063 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4064 | ||
4065 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
f851b60d | 4066 | flush_workqueue(md_misc_wq); |
7eec314d N |
4067 | if (mddev->sync_thread) { |
4068 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
a91d5ac0 | 4069 | md_reap_sync_thread(mddev); |
7eec314d | 4070 | } |
03c902e1 N |
4071 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4072 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4073 | return -EBUSY; |
72a23c21 NB |
4074 | else if (cmd_match(page, "resync")) |
4075 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4076 | else if (cmd_match(page, "recover")) { | |
4077 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4078 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4079 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4080 | int err; |
4081 | if (mddev->pers->start_reshape == NULL) | |
4082 | return -EINVAL; | |
4083 | err = mddev->pers->start_reshape(mddev); | |
4084 | if (err) | |
4085 | return err; | |
a99ac971 | 4086 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4087 | } else { |
bce74dac | 4088 | if (cmd_match(page, "check")) |
7eec314d | 4089 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4090 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4091 | return -EINVAL; |
4092 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4093 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4094 | } |
48c26ddc N |
4095 | if (mddev->ro == 2) { |
4096 | /* A write to sync_action is enough to justify | |
4097 | * canceling read-auto mode | |
4098 | */ | |
4099 | mddev->ro = 0; | |
4100 | md_wakeup_thread(mddev->sync_thread); | |
4101 | } | |
03c902e1 | 4102 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4103 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4104 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4105 | return len; |
4106 | } | |
4107 | ||
c4a39551 JB |
4108 | static struct md_sysfs_entry md_scan_mode = |
4109 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
4110 | ||
4111 | static ssize_t | |
4112 | last_sync_action_show(struct mddev *mddev, char *page) | |
4113 | { | |
4114 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4115 | } | |
4116 | ||
4117 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4118 | ||
9d88883e | 4119 | static ssize_t |
fd01b88c | 4120 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4121 | { |
4122 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4123 | (unsigned long long) |
4124 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4125 | } |
4126 | ||
80ca3a44 | 4127 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4128 | |
88202a0c | 4129 | static ssize_t |
fd01b88c | 4130 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4131 | { |
4132 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4133 | mddev->sync_speed_min ? "local": "system"); | |
4134 | } | |
4135 | ||
4136 | static ssize_t | |
fd01b88c | 4137 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4138 | { |
4139 | int min; | |
4140 | char *e; | |
4141 | if (strncmp(buf, "system", 6)==0) { | |
4142 | mddev->sync_speed_min = 0; | |
4143 | return len; | |
4144 | } | |
4145 | min = simple_strtoul(buf, &e, 10); | |
4146 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4147 | return -EINVAL; | |
4148 | mddev->sync_speed_min = min; | |
4149 | return len; | |
4150 | } | |
4151 | ||
4152 | static struct md_sysfs_entry md_sync_min = | |
4153 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4154 | ||
4155 | static ssize_t | |
fd01b88c | 4156 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4157 | { |
4158 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4159 | mddev->sync_speed_max ? "local": "system"); | |
4160 | } | |
4161 | ||
4162 | static ssize_t | |
fd01b88c | 4163 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4164 | { |
4165 | int max; | |
4166 | char *e; | |
4167 | if (strncmp(buf, "system", 6)==0) { | |
4168 | mddev->sync_speed_max = 0; | |
4169 | return len; | |
4170 | } | |
4171 | max = simple_strtoul(buf, &e, 10); | |
4172 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4173 | return -EINVAL; | |
4174 | mddev->sync_speed_max = max; | |
4175 | return len; | |
4176 | } | |
4177 | ||
4178 | static struct md_sysfs_entry md_sync_max = | |
4179 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4180 | ||
d7f3d291 | 4181 | static ssize_t |
fd01b88c | 4182 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4183 | { |
4184 | return sprintf(page, "%d\n", mddev->degraded); | |
4185 | } | |
4186 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4187 | |
90b08710 | 4188 | static ssize_t |
fd01b88c | 4189 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4190 | { |
4191 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4192 | } | |
4193 | ||
4194 | static ssize_t | |
fd01b88c | 4195 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4196 | { |
4197 | long n; | |
4198 | ||
b29bebd6 | 4199 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4200 | return -EINVAL; |
4201 | ||
4202 | if (n != 0 && n != 1) | |
4203 | return -EINVAL; | |
4204 | ||
4205 | mddev->parallel_resync = n; | |
4206 | ||
4207 | if (mddev->sync_thread) | |
4208 | wake_up(&resync_wait); | |
4209 | ||
4210 | return len; | |
4211 | } | |
4212 | ||
4213 | /* force parallel resync, even with shared block devices */ | |
4214 | static struct md_sysfs_entry md_sync_force_parallel = | |
4215 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4216 | sync_force_parallel_show, sync_force_parallel_store); | |
4217 | ||
88202a0c | 4218 | static ssize_t |
fd01b88c | 4219 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4220 | { |
4221 | unsigned long resync, dt, db; | |
d1a7c503 N |
4222 | if (mddev->curr_resync == 0) |
4223 | return sprintf(page, "none\n"); | |
9687a60c AN |
4224 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4225 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4226 | if (!dt) dt++; |
9687a60c AN |
4227 | db = resync - mddev->resync_mark_cnt; |
4228 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4229 | } |
4230 | ||
80ca3a44 | 4231 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4232 | |
4233 | static ssize_t | |
fd01b88c | 4234 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4235 | { |
13ae864b | 4236 | unsigned long long max_sectors, resync; |
88202a0c | 4237 | |
acb180b0 N |
4238 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4239 | return sprintf(page, "none\n"); | |
4240 | ||
72f36d59 N |
4241 | if (mddev->curr_resync == 1 || |
4242 | mddev->curr_resync == 2) | |
4243 | return sprintf(page, "delayed\n"); | |
4244 | ||
c804cdec N |
4245 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4246 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4247 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4248 | else |
58c0fed4 | 4249 | max_sectors = mddev->dev_sectors; |
88202a0c | 4250 | |
acb180b0 | 4251 | resync = mddev->curr_resync_completed; |
13ae864b | 4252 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4253 | } |
4254 | ||
80ca3a44 | 4255 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4256 | |
5e96ee65 | 4257 | static ssize_t |
fd01b88c | 4258 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4259 | { |
4260 | return sprintf(page, "%llu\n", | |
4261 | (unsigned long long)mddev->resync_min); | |
4262 | } | |
4263 | static ssize_t | |
fd01b88c | 4264 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4265 | { |
4266 | unsigned long long min; | |
b29bebd6 | 4267 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 NB |
4268 | return -EINVAL; |
4269 | if (min > mddev->resync_max) | |
4270 | return -EINVAL; | |
4271 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4272 | return -EBUSY; | |
4273 | ||
4274 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4275 | if (mddev->chunk_sectors) { |
2ac06c33 | 4276 | sector_t temp = min; |
9d8f0363 | 4277 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4278 | return -EINVAL; |
4279 | } | |
4280 | mddev->resync_min = min; | |
4281 | ||
4282 | return len; | |
4283 | } | |
4284 | ||
4285 | static struct md_sysfs_entry md_min_sync = | |
4286 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4287 | ||
c6207277 | 4288 | static ssize_t |
fd01b88c | 4289 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4290 | { |
4291 | if (mddev->resync_max == MaxSector) | |
4292 | return sprintf(page, "max\n"); | |
4293 | else | |
4294 | return sprintf(page, "%llu\n", | |
4295 | (unsigned long long)mddev->resync_max); | |
4296 | } | |
4297 | static ssize_t | |
fd01b88c | 4298 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 N |
4299 | { |
4300 | if (strncmp(buf, "max", 3) == 0) | |
4301 | mddev->resync_max = MaxSector; | |
4302 | else { | |
5e96ee65 | 4303 | unsigned long long max; |
b29bebd6 | 4304 | if (kstrtoull(buf, 10, &max)) |
5e96ee65 NB |
4305 | return -EINVAL; |
4306 | if (max < mddev->resync_min) | |
c6207277 N |
4307 | return -EINVAL; |
4308 | if (max < mddev->resync_max && | |
4d484a4a | 4309 | mddev->ro == 0 && |
c6207277 N |
4310 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4311 | return -EBUSY; | |
4312 | ||
4313 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4314 | if (mddev->chunk_sectors) { |
2ac06c33 | 4315 | sector_t temp = max; |
9d8f0363 | 4316 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4317 | return -EINVAL; |
4318 | } | |
4319 | mddev->resync_max = max; | |
4320 | } | |
4321 | wake_up(&mddev->recovery_wait); | |
4322 | return len; | |
4323 | } | |
4324 | ||
4325 | static struct md_sysfs_entry md_max_sync = | |
4326 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4327 | ||
e464eafd | 4328 | static ssize_t |
fd01b88c | 4329 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4330 | { |
4331 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4332 | } | |
4333 | ||
4334 | static ssize_t | |
fd01b88c | 4335 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4336 | { |
4337 | char *e; | |
4338 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4339 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4340 | |
f72ffdd6 | 4341 | if (mddev->pers == NULL || |
b8d966ef | 4342 | mddev->pers->quiesce == NULL) |
e464eafd N |
4343 | return -EINVAL; |
4344 | if (buf == e || (*e && *e != '\n')) | |
4345 | return -EINVAL; | |
23ddff37 N |
4346 | |
4347 | mddev->suspend_lo = new; | |
4348 | if (new >= old) | |
4349 | /* Shrinking suspended region */ | |
e464eafd | 4350 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4351 | else { |
4352 | /* Expanding suspended region - need to wait */ | |
4353 | mddev->pers->quiesce(mddev, 1); | |
4354 | mddev->pers->quiesce(mddev, 0); | |
4355 | } | |
4356 | return len; | |
e464eafd N |
4357 | } |
4358 | static struct md_sysfs_entry md_suspend_lo = | |
4359 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4360 | ||
e464eafd | 4361 | static ssize_t |
fd01b88c | 4362 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4363 | { |
4364 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4365 | } | |
4366 | ||
4367 | static ssize_t | |
fd01b88c | 4368 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4369 | { |
4370 | char *e; | |
4371 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4372 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4373 | |
b8d966ef N |
4374 | if (mddev->pers == NULL || |
4375 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4376 | return -EINVAL; |
4377 | if (buf == e || (*e && *e != '\n')) | |
4378 | return -EINVAL; | |
23ddff37 N |
4379 | |
4380 | mddev->suspend_hi = new; | |
4381 | if (new <= old) | |
4382 | /* Shrinking suspended region */ | |
4383 | mddev->pers->quiesce(mddev, 2); | |
4384 | else { | |
4385 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4386 | mddev->pers->quiesce(mddev, 1); |
4387 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4388 | } |
4389 | return len; | |
e464eafd N |
4390 | } |
4391 | static struct md_sysfs_entry md_suspend_hi = | |
4392 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4393 | ||
08a02ecd | 4394 | static ssize_t |
fd01b88c | 4395 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4396 | { |
4397 | if (mddev->reshape_position != MaxSector) | |
4398 | return sprintf(page, "%llu\n", | |
4399 | (unsigned long long)mddev->reshape_position); | |
4400 | strcpy(page, "none\n"); | |
4401 | return 5; | |
4402 | } | |
4403 | ||
4404 | static ssize_t | |
fd01b88c | 4405 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4406 | { |
c6563a8c | 4407 | struct md_rdev *rdev; |
08a02ecd N |
4408 | char *e; |
4409 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4410 | if (mddev->pers) | |
4411 | return -EBUSY; | |
4412 | if (buf == e || (*e && *e != '\n')) | |
4413 | return -EINVAL; | |
4414 | mddev->reshape_position = new; | |
4415 | mddev->delta_disks = 0; | |
2c810cdd | 4416 | mddev->reshape_backwards = 0; |
08a02ecd N |
4417 | mddev->new_level = mddev->level; |
4418 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4419 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4420 | rdev_for_each(rdev, mddev) |
4421 | rdev->new_data_offset = rdev->data_offset; | |
08a02ecd N |
4422 | return len; |
4423 | } | |
4424 | ||
4425 | static struct md_sysfs_entry md_reshape_position = | |
4426 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4427 | reshape_position_store); | |
4428 | ||
2c810cdd N |
4429 | static ssize_t |
4430 | reshape_direction_show(struct mddev *mddev, char *page) | |
4431 | { | |
4432 | return sprintf(page, "%s\n", | |
4433 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4434 | } | |
4435 | ||
4436 | static ssize_t | |
4437 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4438 | { | |
4439 | int backwards = 0; | |
4440 | if (cmd_match(buf, "forwards")) | |
4441 | backwards = 0; | |
4442 | else if (cmd_match(buf, "backwards")) | |
4443 | backwards = 1; | |
4444 | else | |
4445 | return -EINVAL; | |
4446 | if (mddev->reshape_backwards == backwards) | |
4447 | return len; | |
4448 | ||
4449 | /* check if we are allowed to change */ | |
4450 | if (mddev->delta_disks) | |
4451 | return -EBUSY; | |
4452 | ||
4453 | if (mddev->persistent && | |
4454 | mddev->major_version == 0) | |
4455 | return -EINVAL; | |
4456 | ||
4457 | mddev->reshape_backwards = backwards; | |
4458 | return len; | |
4459 | } | |
4460 | ||
4461 | static struct md_sysfs_entry md_reshape_direction = | |
4462 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4463 | reshape_direction_store); | |
4464 | ||
b522adcd | 4465 | static ssize_t |
fd01b88c | 4466 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4467 | { |
4468 | if (mddev->external_size) | |
4469 | return sprintf(page, "%llu\n", | |
4470 | (unsigned long long)mddev->array_sectors/2); | |
4471 | else | |
4472 | return sprintf(page, "default\n"); | |
4473 | } | |
4474 | ||
4475 | static ssize_t | |
fd01b88c | 4476 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4477 | { |
4478 | sector_t sectors; | |
4479 | ||
4480 | if (strncmp(buf, "default", 7) == 0) { | |
4481 | if (mddev->pers) | |
4482 | sectors = mddev->pers->size(mddev, 0, 0); | |
4483 | else | |
4484 | sectors = mddev->array_sectors; | |
4485 | ||
4486 | mddev->external_size = 0; | |
4487 | } else { | |
4488 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4489 | return -EINVAL; | |
4490 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4491 | return -E2BIG; |
b522adcd DW |
4492 | |
4493 | mddev->external_size = 1; | |
4494 | } | |
4495 | ||
4496 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4497 | if (mddev->pers) { |
4498 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4499 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4500 | } |
b522adcd DW |
4501 | return len; |
4502 | } | |
4503 | ||
4504 | static struct md_sysfs_entry md_array_size = | |
4505 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4506 | array_size_store); | |
e464eafd | 4507 | |
eae1701f N |
4508 | static struct attribute *md_default_attrs[] = { |
4509 | &md_level.attr, | |
d4dbd025 | 4510 | &md_layout.attr, |
eae1701f | 4511 | &md_raid_disks.attr, |
3b34380a | 4512 | &md_chunk_size.attr, |
a35b0d69 | 4513 | &md_size.attr, |
a94213b1 | 4514 | &md_resync_start.attr, |
8bb93aac | 4515 | &md_metadata.attr, |
6d7ff738 | 4516 | &md_new_device.attr, |
16f17b39 | 4517 | &md_safe_delay.attr, |
9e653b63 | 4518 | &md_array_state.attr, |
08a02ecd | 4519 | &md_reshape_position.attr, |
2c810cdd | 4520 | &md_reshape_direction.attr, |
b522adcd | 4521 | &md_array_size.attr, |
1e50915f | 4522 | &max_corr_read_errors.attr, |
411036fa N |
4523 | NULL, |
4524 | }; | |
4525 | ||
4526 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4527 | &md_scan_mode.attr, |
c4a39551 | 4528 | &md_last_scan_mode.attr, |
9d88883e | 4529 | &md_mismatches.attr, |
88202a0c N |
4530 | &md_sync_min.attr, |
4531 | &md_sync_max.attr, | |
4532 | &md_sync_speed.attr, | |
90b08710 | 4533 | &md_sync_force_parallel.attr, |
88202a0c | 4534 | &md_sync_completed.attr, |
5e96ee65 | 4535 | &md_min_sync.attr, |
c6207277 | 4536 | &md_max_sync.attr, |
e464eafd N |
4537 | &md_suspend_lo.attr, |
4538 | &md_suspend_hi.attr, | |
9b1d1dac | 4539 | &md_bitmap.attr, |
d7f3d291 | 4540 | &md_degraded.attr, |
eae1701f N |
4541 | NULL, |
4542 | }; | |
411036fa N |
4543 | static struct attribute_group md_redundancy_group = { |
4544 | .name = NULL, | |
4545 | .attrs = md_redundancy_attrs, | |
4546 | }; | |
4547 | ||
eae1701f N |
4548 | static ssize_t |
4549 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4550 | { | |
4551 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4552 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4553 | ssize_t rv; |
eae1701f N |
4554 | |
4555 | if (!entry->show) | |
4556 | return -EIO; | |
af8a2434 N |
4557 | spin_lock(&all_mddevs_lock); |
4558 | if (list_empty(&mddev->all_mddevs)) { | |
4559 | spin_unlock(&all_mddevs_lock); | |
4560 | return -EBUSY; | |
4561 | } | |
4562 | mddev_get(mddev); | |
4563 | spin_unlock(&all_mddevs_lock); | |
4564 | ||
5dc5cf7d IM |
4565 | rv = mddev_lock(mddev); |
4566 | if (!rv) { | |
4567 | rv = entry->show(mddev, page); | |
4568 | mddev_unlock(mddev); | |
4569 | } | |
af8a2434 | 4570 | mddev_put(mddev); |
96de1e66 | 4571 | return rv; |
eae1701f N |
4572 | } |
4573 | ||
4574 | static ssize_t | |
4575 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4576 | const char *page, size_t length) | |
4577 | { | |
4578 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4579 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4580 | ssize_t rv; |
eae1701f N |
4581 | |
4582 | if (!entry->store) | |
4583 | return -EIO; | |
67463acb N |
4584 | if (!capable(CAP_SYS_ADMIN)) |
4585 | return -EACCES; | |
af8a2434 N |
4586 | spin_lock(&all_mddevs_lock); |
4587 | if (list_empty(&mddev->all_mddevs)) { | |
4588 | spin_unlock(&all_mddevs_lock); | |
4589 | return -EBUSY; | |
4590 | } | |
4591 | mddev_get(mddev); | |
4592 | spin_unlock(&all_mddevs_lock); | |
a7a3f08d N |
4593 | if (entry->store == new_dev_store) |
4594 | flush_workqueue(md_misc_wq); | |
5dc5cf7d IM |
4595 | rv = mddev_lock(mddev); |
4596 | if (!rv) { | |
4597 | rv = entry->store(mddev, page, length); | |
4598 | mddev_unlock(mddev); | |
4599 | } | |
af8a2434 | 4600 | mddev_put(mddev); |
96de1e66 | 4601 | return rv; |
eae1701f N |
4602 | } |
4603 | ||
4604 | static void md_free(struct kobject *ko) | |
4605 | { | |
fd01b88c | 4606 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4607 | |
4608 | if (mddev->sysfs_state) | |
4609 | sysfs_put(mddev->sysfs_state); | |
4610 | ||
4611 | if (mddev->gendisk) { | |
4612 | del_gendisk(mddev->gendisk); | |
4613 | put_disk(mddev->gendisk); | |
4614 | } | |
4615 | if (mddev->queue) | |
4616 | blk_cleanup_queue(mddev->queue); | |
4617 | ||
eae1701f N |
4618 | kfree(mddev); |
4619 | } | |
4620 | ||
52cf25d0 | 4621 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4622 | .show = md_attr_show, |
4623 | .store = md_attr_store, | |
4624 | }; | |
4625 | static struct kobj_type md_ktype = { | |
4626 | .release = md_free, | |
4627 | .sysfs_ops = &md_sysfs_ops, | |
4628 | .default_attrs = md_default_attrs, | |
4629 | }; | |
4630 | ||
1da177e4 LT |
4631 | int mdp_major = 0; |
4632 | ||
5fd3a17e DW |
4633 | static void mddev_delayed_delete(struct work_struct *ws) |
4634 | { | |
fd01b88c | 4635 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4636 | |
43a70507 | 4637 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4638 | kobject_del(&mddev->kobj); |
4639 | kobject_put(&mddev->kobj); | |
4640 | } | |
4641 | ||
efeb53c0 | 4642 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4643 | { |
48c9c27b | 4644 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4645 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4646 | struct gendisk *disk; |
efeb53c0 N |
4647 | int partitioned; |
4648 | int shift; | |
4649 | int unit; | |
3830c62f | 4650 | int error; |
1da177e4 LT |
4651 | |
4652 | if (!mddev) | |
efeb53c0 N |
4653 | return -ENODEV; |
4654 | ||
4655 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4656 | shift = partitioned ? MdpMinorShift : 0; | |
4657 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4658 | |
e804ac78 TH |
4659 | /* wait for any previous instance of this device to be |
4660 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4661 | */ |
e804ac78 | 4662 | flush_workqueue(md_misc_wq); |
d3374825 | 4663 | |
48c9c27b | 4664 | mutex_lock(&disks_mutex); |
0909dc44 N |
4665 | error = -EEXIST; |
4666 | if (mddev->gendisk) | |
4667 | goto abort; | |
efeb53c0 N |
4668 | |
4669 | if (name) { | |
4670 | /* Need to ensure that 'name' is not a duplicate. | |
4671 | */ | |
fd01b88c | 4672 | struct mddev *mddev2; |
efeb53c0 N |
4673 | spin_lock(&all_mddevs_lock); |
4674 | ||
4675 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4676 | if (mddev2->gendisk && | |
4677 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4678 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4679 | goto abort; |
efeb53c0 N |
4680 | } |
4681 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4682 | } |
8b765398 | 4683 | |
0909dc44 | 4684 | error = -ENOMEM; |
8b765398 | 4685 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4686 | if (!mddev->queue) |
4687 | goto abort; | |
409c57f3 N |
4688 | mddev->queue->queuedata = mddev; |
4689 | ||
409c57f3 | 4690 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 4691 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 4692 | |
1da177e4 LT |
4693 | disk = alloc_disk(1 << shift); |
4694 | if (!disk) { | |
8b765398 N |
4695 | blk_cleanup_queue(mddev->queue); |
4696 | mddev->queue = NULL; | |
0909dc44 | 4697 | goto abort; |
1da177e4 | 4698 | } |
efeb53c0 | 4699 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4700 | disk->first_minor = unit << shift; |
efeb53c0 N |
4701 | if (name) |
4702 | strcpy(disk->disk_name, name); | |
4703 | else if (partitioned) | |
1da177e4 | 4704 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4705 | else |
1da177e4 | 4706 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4707 | disk->fops = &md_fops; |
4708 | disk->private_data = mddev; | |
4709 | disk->queue = mddev->queue; | |
b0140891 | 4710 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4711 | /* Allow extended partitions. This makes the |
d3374825 | 4712 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4713 | * remove it now. |
4714 | */ | |
4715 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4716 | mddev->gendisk = disk; |
b0140891 N |
4717 | /* As soon as we call add_disk(), another thread could get |
4718 | * through to md_open, so make sure it doesn't get too far | |
4719 | */ | |
4720 | mutex_lock(&mddev->open_mutex); | |
4721 | add_disk(disk); | |
4722 | ||
ed9e1982 TH |
4723 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4724 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4725 | if (error) { |
4726 | /* This isn't possible, but as kobject_init_and_add is marked | |
4727 | * __must_check, we must do something with the result | |
4728 | */ | |
5e55e2f5 N |
4729 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4730 | disk->disk_name); | |
0909dc44 N |
4731 | error = 0; |
4732 | } | |
00bcb4ac N |
4733 | if (mddev->kobj.sd && |
4734 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4735 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4736 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4737 | abort: |
4738 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4739 | if (!error && mddev->kobj.sd) { |
3830c62f | 4740 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4741 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4742 | } |
d3374825 | 4743 | mddev_put(mddev); |
0909dc44 | 4744 | return error; |
efeb53c0 N |
4745 | } |
4746 | ||
4747 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4748 | { | |
4749 | md_alloc(dev, NULL); | |
1da177e4 LT |
4750 | return NULL; |
4751 | } | |
4752 | ||
efeb53c0 N |
4753 | static int add_named_array(const char *val, struct kernel_param *kp) |
4754 | { | |
4755 | /* val must be "md_*" where * is not all digits. | |
4756 | * We allocate an array with a large free minor number, and | |
4757 | * set the name to val. val must not already be an active name. | |
4758 | */ | |
4759 | int len = strlen(val); | |
4760 | char buf[DISK_NAME_LEN]; | |
4761 | ||
4762 | while (len && val[len-1] == '\n') | |
4763 | len--; | |
4764 | if (len >= DISK_NAME_LEN) | |
4765 | return -E2BIG; | |
4766 | strlcpy(buf, val, len+1); | |
4767 | if (strncmp(buf, "md_", 3) != 0) | |
4768 | return -EINVAL; | |
4769 | return md_alloc(0, buf); | |
4770 | } | |
4771 | ||
1da177e4 LT |
4772 | static void md_safemode_timeout(unsigned long data) |
4773 | { | |
fd01b88c | 4774 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 4775 | |
0fd62b86 NB |
4776 | if (!atomic_read(&mddev->writes_pending)) { |
4777 | mddev->safemode = 1; | |
4778 | if (mddev->external) | |
00bcb4ac | 4779 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4780 | } |
1da177e4 LT |
4781 | md_wakeup_thread(mddev->thread); |
4782 | } | |
4783 | ||
6ff8d8ec | 4784 | static int start_dirty_degraded; |
1da177e4 | 4785 | |
fd01b88c | 4786 | int md_run(struct mddev *mddev) |
1da177e4 | 4787 | { |
2604b703 | 4788 | int err; |
3cb03002 | 4789 | struct md_rdev *rdev; |
84fc4b56 | 4790 | struct md_personality *pers; |
1da177e4 | 4791 | |
a757e64c N |
4792 | if (list_empty(&mddev->disks)) |
4793 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4794 | return -EINVAL; |
1da177e4 LT |
4795 | |
4796 | if (mddev->pers) | |
4797 | return -EBUSY; | |
bb4f1e9d N |
4798 | /* Cannot run until previous stop completes properly */ |
4799 | if (mddev->sysfs_active) | |
4800 | return -EBUSY; | |
b6eb127d | 4801 | |
1da177e4 LT |
4802 | /* |
4803 | * Analyze all RAID superblock(s) | |
4804 | */ | |
1ec4a939 N |
4805 | if (!mddev->raid_disks) { |
4806 | if (!mddev->persistent) | |
4807 | return -EINVAL; | |
a757e64c | 4808 | analyze_sbs(mddev); |
1ec4a939 | 4809 | } |
1da177e4 | 4810 | |
d9d166c2 N |
4811 | if (mddev->level != LEVEL_NONE) |
4812 | request_module("md-level-%d", mddev->level); | |
4813 | else if (mddev->clevel[0]) | |
4814 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4815 | |
4816 | /* | |
4817 | * Drop all container device buffers, from now on | |
4818 | * the only valid external interface is through the md | |
4819 | * device. | |
1da177e4 | 4820 | */ |
dafb20fa | 4821 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 4822 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4823 | continue; |
4824 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4825 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4826 | |
4827 | /* perform some consistency tests on the device. | |
4828 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4829 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4830 | */ |
a6ff7e08 JB |
4831 | if (rdev->meta_bdev) { |
4832 | /* Nothing to check */; | |
4833 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4834 | if (mddev->dev_sectors && |
4835 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4836 | > rdev->sb_start) { |
f0d76d70 N |
4837 | printk("md: %s: data overlaps metadata\n", |
4838 | mdname(mddev)); | |
4839 | return -EINVAL; | |
4840 | } | |
4841 | } else { | |
0f420358 | 4842 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4843 | > rdev->data_offset) { |
4844 | printk("md: %s: metadata overlaps data\n", | |
4845 | mdname(mddev)); | |
4846 | return -EINVAL; | |
4847 | } | |
4848 | } | |
00bcb4ac | 4849 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4850 | } |
4851 | ||
a167f663 | 4852 | if (mddev->bio_set == NULL) |
395c72a7 | 4853 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 4854 | |
1da177e4 | 4855 | spin_lock(&pers_lock); |
d9d166c2 | 4856 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4857 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4858 | spin_unlock(&pers_lock); |
d9d166c2 N |
4859 | if (mddev->level != LEVEL_NONE) |
4860 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4861 | mddev->level); | |
4862 | else | |
4863 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4864 | mddev->clevel); | |
1da177e4 LT |
4865 | return -EINVAL; |
4866 | } | |
2604b703 | 4867 | mddev->pers = pers; |
1da177e4 | 4868 | spin_unlock(&pers_lock); |
34817e8c N |
4869 | if (mddev->level != pers->level) { |
4870 | mddev->level = pers->level; | |
4871 | mddev->new_level = pers->level; | |
4872 | } | |
d9d166c2 | 4873 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4874 | |
f6705578 | 4875 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4876 | pers->start_reshape == NULL) { |
f6705578 N |
4877 | /* This personality cannot handle reshaping... */ |
4878 | mddev->pers = NULL; | |
4879 | module_put(pers->owner); | |
4880 | return -EINVAL; | |
4881 | } | |
4882 | ||
7dd5e7c3 N |
4883 | if (pers->sync_request) { |
4884 | /* Warn if this is a potentially silly | |
4885 | * configuration. | |
4886 | */ | |
4887 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 4888 | struct md_rdev *rdev2; |
7dd5e7c3 | 4889 | int warned = 0; |
159ec1fc | 4890 | |
dafb20fa N |
4891 | rdev_for_each(rdev, mddev) |
4892 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
4893 | if (rdev < rdev2 && |
4894 | rdev->bdev->bd_contains == | |
4895 | rdev2->bdev->bd_contains) { | |
4896 | printk(KERN_WARNING | |
4897 | "%s: WARNING: %s appears to be" | |
4898 | " on the same physical disk as" | |
4899 | " %s.\n", | |
4900 | mdname(mddev), | |
4901 | bdevname(rdev->bdev,b), | |
4902 | bdevname(rdev2->bdev,b2)); | |
4903 | warned = 1; | |
4904 | } | |
4905 | } | |
159ec1fc | 4906 | |
7dd5e7c3 N |
4907 | if (warned) |
4908 | printk(KERN_WARNING | |
4909 | "True protection against single-disk" | |
4910 | " failure might be compromised.\n"); | |
4911 | } | |
4912 | ||
657390d2 | 4913 | mddev->recovery = 0; |
58c0fed4 AN |
4914 | /* may be over-ridden by personality */ |
4915 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4916 | ||
6ff8d8ec | 4917 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4918 | |
0f9552b5 | 4919 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4920 | mddev->ro = 2; /* read-only, but switch on first write */ |
4921 | ||
b15c2e57 | 4922 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4923 | if (err) |
4924 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4925 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4926 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4927 | " but 'external_size' not in effect?\n", __func__); | |
4928 | printk(KERN_ERR | |
4929 | "md: invalid array_size %llu > default size %llu\n", | |
4930 | (unsigned long long)mddev->array_sectors / 2, | |
4931 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4932 | err = -EINVAL; | |
b522adcd | 4933 | } |
ef99bf48 N |
4934 | if (err == 0 && mddev->pers->sync_request && |
4935 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { | |
b15c2e57 | 4936 | err = bitmap_create(mddev); |
5aa61f42 | 4937 | if (err) |
b15c2e57 N |
4938 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", |
4939 | mdname(mddev), err); | |
b15c2e57 | 4940 | } |
1da177e4 | 4941 | if (err) { |
5aa61f42 | 4942 | mddev_detach(mddev); |
afa0f557 | 4943 | mddev->pers->free(mddev, mddev->private); |
1da177e4 LT |
4944 | module_put(mddev->pers->owner); |
4945 | mddev->pers = NULL; | |
32a7627c N |
4946 | bitmap_destroy(mddev); |
4947 | return err; | |
1da177e4 | 4948 | } |
5c675f83 N |
4949 | if (mddev->queue) { |
4950 | mddev->queue->backing_dev_info.congested_data = mddev; | |
4951 | mddev->queue->backing_dev_info.congested_fn = md_congested; | |
64590f45 | 4952 | blk_queue_merge_bvec(mddev->queue, md_mergeable_bvec); |
5c675f83 | 4953 | } |
5e55e2f5 | 4954 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4955 | if (mddev->kobj.sd && |
4956 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4957 | printk(KERN_WARNING |
4958 | "md: cannot register extra attributes for %s\n", | |
4959 | mdname(mddev)); | |
00bcb4ac | 4960 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4961 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4962 | mddev->ro = 0; |
4963 | ||
f72ffdd6 | 4964 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4965 | atomic_set(&mddev->max_corr_read_errors, |
4966 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4967 | mddev->safemode = 0; |
4968 | mddev->safemode_timer.function = md_safemode_timeout; | |
4969 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4970 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4971 | mddev->in_sync = 1; |
0ca69886 N |
4972 | smp_wmb(); |
4973 | mddev->ready = 1; | |
dafb20fa | 4974 | rdev_for_each(rdev, mddev) |
36fad858 NK |
4975 | if (rdev->raid_disk >= 0) |
4976 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 4977 | /* failure here is OK */; |
f72ffdd6 | 4978 | |
1da177e4 | 4979 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 4980 | |
7a0a5355 | 4981 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 4982 | md_update_sb(mddev, 0); |
1da177e4 | 4983 | |
d7603b7e | 4984 | md_new_event(mddev); |
00bcb4ac N |
4985 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4986 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4987 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4988 | return 0; |
4989 | } | |
390ee602 | 4990 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4991 | |
fd01b88c | 4992 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
4993 | { |
4994 | int err; | |
4995 | ||
4996 | err = md_run(mddev); | |
4997 | if (err) | |
4998 | goto out; | |
69e51b44 N |
4999 | err = bitmap_load(mddev); |
5000 | if (err) { | |
5001 | bitmap_destroy(mddev); | |
5002 | goto out; | |
5003 | } | |
0fd018af JB |
5004 | |
5005 | md_wakeup_thread(mddev->thread); | |
5006 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5007 | ||
fe60b014 N |
5008 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5009 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5010 | mddev->changed = 1; |
fe60b014 N |
5011 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5012 | out: | |
5013 | return err; | |
5014 | } | |
5015 | ||
fd01b88c | 5016 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5017 | { |
5018 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5019 | |
80fab1d7 | 5020 | /* Complain if it has no devices */ |
1da177e4 | 5021 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5022 | return -ENXIO; |
5023 | if (!mddev->pers) | |
5024 | return -EINVAL; | |
5025 | if (!mddev->ro) | |
5026 | return -EBUSY; | |
5027 | mddev->safemode = 0; | |
5028 | mddev->ro = 0; | |
5029 | set_disk_ro(disk, 0); | |
5030 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5031 | mdname(mddev)); | |
5032 | /* Kick recovery or resync if necessary */ | |
5033 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5034 | md_wakeup_thread(mddev->thread); | |
5035 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5036 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5037 | return 0; |
1da177e4 LT |
5038 | } |
5039 | ||
fd01b88c | 5040 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5041 | { |
5042 | mddev->array_sectors = 0; | |
5043 | mddev->external_size = 0; | |
5044 | mddev->dev_sectors = 0; | |
5045 | mddev->raid_disks = 0; | |
5046 | mddev->recovery_cp = 0; | |
5047 | mddev->resync_min = 0; | |
5048 | mddev->resync_max = MaxSector; | |
5049 | mddev->reshape_position = MaxSector; | |
5050 | mddev->external = 0; | |
5051 | mddev->persistent = 0; | |
5052 | mddev->level = LEVEL_NONE; | |
5053 | mddev->clevel[0] = 0; | |
5054 | mddev->flags = 0; | |
5055 | mddev->ro = 0; | |
5056 | mddev->metadata_type[0] = 0; | |
5057 | mddev->chunk_sectors = 0; | |
5058 | mddev->ctime = mddev->utime = 0; | |
5059 | mddev->layout = 0; | |
5060 | mddev->max_disks = 0; | |
5061 | mddev->events = 0; | |
a8707c08 | 5062 | mddev->can_decrease_events = 0; |
6177b472 | 5063 | mddev->delta_disks = 0; |
2c810cdd | 5064 | mddev->reshape_backwards = 0; |
6177b472 N |
5065 | mddev->new_level = LEVEL_NONE; |
5066 | mddev->new_layout = 0; | |
5067 | mddev->new_chunk_sectors = 0; | |
5068 | mddev->curr_resync = 0; | |
7f7583d4 | 5069 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5070 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5071 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5072 | mddev->recovery = 0; | |
5073 | mddev->in_sync = 0; | |
f0b4f7e2 | 5074 | mddev->changed = 0; |
6177b472 | 5075 | mddev->degraded = 0; |
6177b472 | 5076 | mddev->safemode = 0; |
050b6615 | 5077 | mddev->merge_check_needed = 0; |
6177b472 N |
5078 | mddev->bitmap_info.offset = 0; |
5079 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5080 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5081 | mddev->bitmap_info.chunksize = 0; |
5082 | mddev->bitmap_info.daemon_sleep = 0; | |
5083 | mddev->bitmap_info.max_write_behind = 0; | |
5084 | } | |
5085 | ||
fd01b88c | 5086 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5087 | { |
6b6204ee | 5088 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5089 | flush_workqueue(md_misc_wq); |
a047e125 | 5090 | if (mddev->sync_thread) { |
a047e125 | 5091 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5092 | md_reap_sync_thread(mddev); |
a047e125 N |
5093 | } |
5094 | ||
5095 | del_timer_sync(&mddev->safemode_timer); | |
5096 | ||
5097 | bitmap_flush(mddev); | |
5098 | md_super_wait(mddev); | |
5099 | ||
b6d428c6 | 5100 | if (mddev->ro == 0 && |
7a0a5355 | 5101 | (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) { |
a047e125 N |
5102 | /* mark array as shutdown cleanly */ |
5103 | mddev->in_sync = 1; | |
5104 | md_update_sb(mddev, 1); | |
5105 | } | |
5106 | } | |
defad61a | 5107 | |
fd01b88c | 5108 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5109 | { |
29f097c4 | 5110 | mddev_lock_nointr(mddev); |
defad61a N |
5111 | __md_stop_writes(mddev); |
5112 | mddev_unlock(mddev); | |
5113 | } | |
390ee602 | 5114 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5115 | |
5aa61f42 N |
5116 | static void mddev_detach(struct mddev *mddev) |
5117 | { | |
5118 | struct bitmap *bitmap = mddev->bitmap; | |
5119 | /* wait for behind writes to complete */ | |
5120 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
5121 | printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n", | |
5122 | mdname(mddev)); | |
5123 | /* need to kick something here to make sure I/O goes? */ | |
5124 | wait_event(bitmap->behind_wait, | |
5125 | atomic_read(&bitmap->behind_writes) == 0); | |
5126 | } | |
5127 | if (mddev->pers->quiesce) { | |
5128 | mddev->pers->quiesce(mddev, 1); | |
5129 | mddev->pers->quiesce(mddev, 0); | |
5130 | } | |
5131 | md_unregister_thread(&mddev->thread); | |
5132 | if (mddev->queue) | |
5133 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
5134 | } | |
5135 | ||
5eff3c43 | 5136 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5137 | { |
0ca69886 | 5138 | mddev->ready = 0; |
5aa61f42 | 5139 | mddev_detach(mddev); |
afa0f557 | 5140 | mddev->pers->free(mddev, mddev->private); |
6177b472 N |
5141 | if (mddev->pers->sync_request && mddev->to_remove == NULL) |
5142 | mddev->to_remove = &md_redundancy_group; | |
5143 | module_put(mddev->pers->owner); | |
5144 | mddev->pers = NULL; | |
cca9cf90 | 5145 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5146 | } |
5eff3c43 N |
5147 | |
5148 | void md_stop(struct mddev *mddev) | |
5149 | { | |
5150 | /* stop the array and free an attached data structures. | |
5151 | * This is called from dm-raid | |
5152 | */ | |
5153 | __md_stop(mddev); | |
5154 | bitmap_destroy(mddev); | |
5155 | if (mddev->bio_set) | |
5156 | bioset_free(mddev->bio_set); | |
5157 | } | |
5158 | ||
390ee602 | 5159 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5160 | |
a05b7ea0 | 5161 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5162 | { |
5163 | int err = 0; | |
30b8feb7 N |
5164 | int did_freeze = 0; |
5165 | ||
5166 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5167 | did_freeze = 1; | |
5168 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5169 | md_wakeup_thread(mddev->thread); | |
5170 | } | |
f851b60d | 5171 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5172 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5173 | if (mddev->sync_thread) |
30b8feb7 N |
5174 | /* Thread might be blocked waiting for metadata update |
5175 | * which will now never happen */ | |
5176 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5177 | |
30b8feb7 | 5178 | mddev_unlock(mddev); |
f851b60d N |
5179 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5180 | &mddev->recovery)); | |
30b8feb7 N |
5181 | mddev_lock_nointr(mddev); |
5182 | ||
a4bd82d0 | 5183 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5184 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5185 | mddev->sync_thread || |
f851b60d | 5186 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5187 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
a4bd82d0 | 5188 | printk("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5189 | if (did_freeze) { |
5190 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5191 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5192 | md_wakeup_thread(mddev->thread); |
5193 | } | |
a4bd82d0 N |
5194 | err = -EBUSY; |
5195 | goto out; | |
5196 | } | |
5197 | if (mddev->pers) { | |
defad61a | 5198 | __md_stop_writes(mddev); |
a4bd82d0 N |
5199 | |
5200 | err = -ENXIO; | |
5201 | if (mddev->ro==1) | |
5202 | goto out; | |
5203 | mddev->ro = 1; | |
5204 | set_disk_ro(mddev->gendisk, 1); | |
5205 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5206 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5207 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5208 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5209 | err = 0; |
a4bd82d0 N |
5210 | } |
5211 | out: | |
5212 | mutex_unlock(&mddev->open_mutex); | |
5213 | return err; | |
5214 | } | |
5215 | ||
9e653b63 N |
5216 | /* mode: |
5217 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5218 | * 2 - stop but do not disassemble array |
5219 | */ | |
f72ffdd6 | 5220 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5221 | struct block_device *bdev) |
1da177e4 | 5222 | { |
1da177e4 | 5223 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5224 | struct md_rdev *rdev; |
30b8feb7 N |
5225 | int did_freeze = 0; |
5226 | ||
5227 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5228 | did_freeze = 1; | |
5229 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5230 | md_wakeup_thread(mddev->thread); | |
5231 | } | |
f851b60d | 5232 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5233 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5234 | if (mddev->sync_thread) |
30b8feb7 N |
5235 | /* Thread might be blocked waiting for metadata update |
5236 | * which will now never happen */ | |
5237 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5238 | |
30b8feb7 | 5239 | mddev_unlock(mddev); |
f851b60d N |
5240 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5241 | !test_bit(MD_RECOVERY_RUNNING, | |
5242 | &mddev->recovery))); | |
30b8feb7 | 5243 | mddev_lock_nointr(mddev); |
1da177e4 | 5244 | |
c8c00a69 | 5245 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5246 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5247 | mddev->sysfs_active || |
5248 | mddev->sync_thread || | |
f851b60d | 5249 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5250 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
df5b20cf | 5251 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5252 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5253 | if (did_freeze) { |
5254 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5255 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5256 | md_wakeup_thread(mddev->thread); |
5257 | } | |
260fa034 N |
5258 | return -EBUSY; |
5259 | } | |
6e17b027 | 5260 | if (mddev->pers) { |
a4bd82d0 N |
5261 | if (mddev->ro) |
5262 | set_disk_ro(disk, 0); | |
409c57f3 | 5263 | |
defad61a | 5264 | __md_stop_writes(mddev); |
5eff3c43 | 5265 | __md_stop(mddev); |
a4bd82d0 | 5266 | mddev->queue->merge_bvec_fn = NULL; |
a4bd82d0 | 5267 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5268 | |
a4bd82d0 | 5269 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5270 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5271 | |
dafb20fa | 5272 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5273 | if (rdev->raid_disk >= 0) |
5274 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5275 | |
a4bd82d0 | 5276 | set_capacity(disk, 0); |
6e17b027 | 5277 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5278 | mddev->changed = 1; |
a4bd82d0 | 5279 | revalidate_disk(disk); |
0d4ca600 | 5280 | |
a4bd82d0 N |
5281 | if (mddev->ro) |
5282 | mddev->ro = 0; | |
6e17b027 N |
5283 | } else |
5284 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5285 | /* |
5286 | * Free resources if final stop | |
5287 | */ | |
9e653b63 | 5288 | if (mode == 0) { |
1da177e4 LT |
5289 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5290 | ||
978f946b | 5291 | bitmap_destroy(mddev); |
c3d9714e | 5292 | if (mddev->bitmap_info.file) { |
c3d9714e N |
5293 | fput(mddev->bitmap_info.file); |
5294 | mddev->bitmap_info.file = NULL; | |
978f946b | 5295 | } |
c3d9714e | 5296 | mddev->bitmap_info.offset = 0; |
978f946b | 5297 | |
1da177e4 LT |
5298 | export_array(mddev); |
5299 | ||
6177b472 | 5300 | md_clean(mddev); |
934d9c23 | 5301 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5302 | if (mddev->hold_active == UNTIL_STOP) |
5303 | mddev->hold_active = 0; | |
a4bd82d0 | 5304 | } |
3f9d99c1 | 5305 | blk_integrity_unregister(disk); |
d7603b7e | 5306 | md_new_event(mddev); |
00bcb4ac | 5307 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5308 | return 0; |
1da177e4 LT |
5309 | } |
5310 | ||
fdee8ae4 | 5311 | #ifndef MODULE |
fd01b88c | 5312 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5313 | { |
3cb03002 | 5314 | struct md_rdev *rdev; |
1da177e4 LT |
5315 | int err; |
5316 | ||
a757e64c | 5317 | if (list_empty(&mddev->disks)) |
1da177e4 | 5318 | return; |
1da177e4 LT |
5319 | |
5320 | printk(KERN_INFO "md: running: "); | |
5321 | ||
dafb20fa | 5322 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5323 | char b[BDEVNAME_SIZE]; |
5324 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5325 | } | |
5326 | printk("\n"); | |
5327 | ||
d710e138 | 5328 | err = do_md_run(mddev); |
1da177e4 LT |
5329 | if (err) { |
5330 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5331 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5332 | } |
5333 | } | |
5334 | ||
5335 | /* | |
5336 | * lets try to run arrays based on all disks that have arrived | |
5337 | * until now. (those are in pending_raid_disks) | |
5338 | * | |
5339 | * the method: pick the first pending disk, collect all disks with | |
5340 | * the same UUID, remove all from the pending list and put them into | |
5341 | * the 'same_array' list. Then order this list based on superblock | |
5342 | * update time (freshest comes first), kick out 'old' disks and | |
5343 | * compare superblocks. If everything's fine then run it. | |
5344 | * | |
5345 | * If "unit" is allocated, then bump its reference count | |
5346 | */ | |
5347 | static void autorun_devices(int part) | |
5348 | { | |
3cb03002 | 5349 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5350 | struct mddev *mddev; |
1da177e4 LT |
5351 | char b[BDEVNAME_SIZE]; |
5352 | ||
5353 | printk(KERN_INFO "md: autorun ...\n"); | |
5354 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5355 | int unit; |
1da177e4 | 5356 | dev_t dev; |
ad01c9e3 | 5357 | LIST_HEAD(candidates); |
1da177e4 | 5358 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5359 | struct md_rdev, same_set); |
1da177e4 LT |
5360 | |
5361 | printk(KERN_INFO "md: considering %s ...\n", | |
5362 | bdevname(rdev0->bdev,b)); | |
5363 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5364 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5365 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5366 | printk(KERN_INFO "md: adding %s ...\n", | |
5367 | bdevname(rdev->bdev,b)); | |
5368 | list_move(&rdev->same_set, &candidates); | |
5369 | } | |
5370 | /* | |
5371 | * now we have a set of devices, with all of them having | |
5372 | * mostly sane superblocks. It's time to allocate the | |
5373 | * mddev. | |
5374 | */ | |
e8703fe1 N |
5375 | if (part) { |
5376 | dev = MKDEV(mdp_major, | |
5377 | rdev0->preferred_minor << MdpMinorShift); | |
5378 | unit = MINOR(dev) >> MdpMinorShift; | |
5379 | } else { | |
5380 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5381 | unit = MINOR(dev); | |
5382 | } | |
5383 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5384 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5385 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5386 | break; | |
5387 | } | |
1da177e4 LT |
5388 | |
5389 | md_probe(dev, NULL, NULL); | |
5390 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5391 | if (!mddev || !mddev->gendisk) { |
5392 | if (mddev) | |
5393 | mddev_put(mddev); | |
5394 | printk(KERN_ERR | |
1da177e4 LT |
5395 | "md: cannot allocate memory for md drive.\n"); |
5396 | break; | |
5397 | } | |
f72ffdd6 | 5398 | if (mddev_lock(mddev)) |
1da177e4 LT |
5399 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
5400 | mdname(mddev)); | |
5401 | else if (mddev->raid_disks || mddev->major_version | |
5402 | || !list_empty(&mddev->disks)) { | |
f72ffdd6 | 5403 | printk(KERN_WARNING |
1da177e4 LT |
5404 | "md: %s already running, cannot run %s\n", |
5405 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5406 | mddev_unlock(mddev); | |
5407 | } else { | |
5408 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5409 | mddev->persistent = 1; |
159ec1fc | 5410 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5411 | list_del_init(&rdev->same_set); |
5412 | if (bind_rdev_to_array(rdev, mddev)) | |
5413 | export_rdev(rdev); | |
5414 | } | |
5415 | autorun_array(mddev); | |
5416 | mddev_unlock(mddev); | |
5417 | } | |
5418 | /* on success, candidates will be empty, on error | |
5419 | * it won't... | |
5420 | */ | |
159ec1fc | 5421 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5422 | list_del_init(&rdev->same_set); |
1da177e4 | 5423 | export_rdev(rdev); |
4b80991c | 5424 | } |
1da177e4 LT |
5425 | mddev_put(mddev); |
5426 | } | |
5427 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5428 | } | |
fdee8ae4 | 5429 | #endif /* !MODULE */ |
1da177e4 | 5430 | |
f72ffdd6 | 5431 | static int get_version(void __user *arg) |
1da177e4 LT |
5432 | { |
5433 | mdu_version_t ver; | |
5434 | ||
5435 | ver.major = MD_MAJOR_VERSION; | |
5436 | ver.minor = MD_MINOR_VERSION; | |
5437 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5438 | ||
5439 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5440 | return -EFAULT; | |
5441 | ||
5442 | return 0; | |
5443 | } | |
5444 | ||
f72ffdd6 | 5445 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
5446 | { |
5447 | mdu_array_info_t info; | |
a9f326eb | 5448 | int nr,working,insync,failed,spare; |
3cb03002 | 5449 | struct md_rdev *rdev; |
1da177e4 | 5450 | |
1ca69c4b N |
5451 | nr = working = insync = failed = spare = 0; |
5452 | rcu_read_lock(); | |
5453 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5454 | nr++; |
b2d444d7 | 5455 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5456 | failed++; |
5457 | else { | |
5458 | working++; | |
b2d444d7 | 5459 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 5460 | insync++; |
1da177e4 LT |
5461 | else |
5462 | spare++; | |
5463 | } | |
5464 | } | |
1ca69c4b | 5465 | rcu_read_unlock(); |
1da177e4 LT |
5466 | |
5467 | info.major_version = mddev->major_version; | |
5468 | info.minor_version = mddev->minor_version; | |
5469 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5470 | info.ctime = mddev->ctime; | |
5471 | info.level = mddev->level; | |
58c0fed4 AN |
5472 | info.size = mddev->dev_sectors / 2; |
5473 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5474 | info.size = -1; |
1da177e4 LT |
5475 | info.nr_disks = nr; |
5476 | info.raid_disks = mddev->raid_disks; | |
5477 | info.md_minor = mddev->md_minor; | |
5478 | info.not_persistent= !mddev->persistent; | |
5479 | ||
5480 | info.utime = mddev->utime; | |
5481 | info.state = 0; | |
5482 | if (mddev->in_sync) | |
5483 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5484 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 5485 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5486 | info.active_disks = insync; |
1da177e4 LT |
5487 | info.working_disks = working; |
5488 | info.failed_disks = failed; | |
5489 | info.spare_disks = spare; | |
5490 | ||
5491 | info.layout = mddev->layout; | |
9d8f0363 | 5492 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5493 | |
5494 | if (copy_to_user(arg, &info, sizeof(info))) | |
5495 | return -EFAULT; | |
5496 | ||
5497 | return 0; | |
5498 | } | |
5499 | ||
f72ffdd6 | 5500 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
5501 | { |
5502 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5503 | char *ptr, *buf = NULL; | |
5504 | int err = -ENOMEM; | |
5505 | ||
60559da4 | 5506 | file = kmalloc(sizeof(*file), GFP_NOIO); |
2a2275d6 | 5507 | |
32a7627c N |
5508 | if (!file) |
5509 | goto out; | |
5510 | ||
5511 | /* bitmap disabled, zero the first byte and copy out */ | |
1ec885cd | 5512 | if (!mddev->bitmap || !mddev->bitmap->storage.file) { |
32a7627c N |
5513 | file->pathname[0] = '\0'; |
5514 | goto copy_out; | |
5515 | } | |
5516 | ||
5517 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5518 | if (!buf) | |
5519 | goto out; | |
5520 | ||
1ec885cd N |
5521 | ptr = d_path(&mddev->bitmap->storage.file->f_path, |
5522 | buf, sizeof(file->pathname)); | |
6bcfd601 | 5523 | if (IS_ERR(ptr)) |
32a7627c N |
5524 | goto out; |
5525 | ||
5526 | strcpy(file->pathname, ptr); | |
5527 | ||
5528 | copy_out: | |
5529 | err = 0; | |
5530 | if (copy_to_user(arg, file, sizeof(*file))) | |
5531 | err = -EFAULT; | |
5532 | out: | |
5533 | kfree(buf); | |
5534 | kfree(file); | |
5535 | return err; | |
5536 | } | |
5537 | ||
f72ffdd6 | 5538 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
5539 | { |
5540 | mdu_disk_info_t info; | |
3cb03002 | 5541 | struct md_rdev *rdev; |
1da177e4 LT |
5542 | |
5543 | if (copy_from_user(&info, arg, sizeof(info))) | |
5544 | return -EFAULT; | |
5545 | ||
1ca69c4b N |
5546 | rcu_read_lock(); |
5547 | rdev = find_rdev_nr_rcu(mddev, info.number); | |
1da177e4 LT |
5548 | if (rdev) { |
5549 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5550 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5551 | info.raid_disk = rdev->raid_disk; | |
5552 | info.state = 0; | |
b2d444d7 | 5553 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5554 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5555 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5556 | info.state |= (1<<MD_DISK_ACTIVE); |
5557 | info.state |= (1<<MD_DISK_SYNC); | |
5558 | } | |
8ddf9efe N |
5559 | if (test_bit(WriteMostly, &rdev->flags)) |
5560 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5561 | } else { |
5562 | info.major = info.minor = 0; | |
5563 | info.raid_disk = -1; | |
5564 | info.state = (1<<MD_DISK_REMOVED); | |
5565 | } | |
1ca69c4b | 5566 | rcu_read_unlock(); |
1da177e4 LT |
5567 | |
5568 | if (copy_to_user(arg, &info, sizeof(info))) | |
5569 | return -EFAULT; | |
5570 | ||
5571 | return 0; | |
5572 | } | |
5573 | ||
f72ffdd6 | 5574 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5575 | { |
5576 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5577 | struct md_rdev *rdev; |
1da177e4 LT |
5578 | dev_t dev = MKDEV(info->major,info->minor); |
5579 | ||
5580 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5581 | return -EOVERFLOW; | |
5582 | ||
5583 | if (!mddev->raid_disks) { | |
5584 | int err; | |
5585 | /* expecting a device which has a superblock */ | |
5586 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5587 | if (IS_ERR(rdev)) { | |
f72ffdd6 | 5588 | printk(KERN_WARNING |
1da177e4 LT |
5589 | "md: md_import_device returned %ld\n", |
5590 | PTR_ERR(rdev)); | |
5591 | return PTR_ERR(rdev); | |
5592 | } | |
5593 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5594 | struct md_rdev *rdev0 |
5595 | = list_entry(mddev->disks.next, | |
5596 | struct md_rdev, same_set); | |
a9f326eb | 5597 | err = super_types[mddev->major_version] |
1da177e4 LT |
5598 | .load_super(rdev, rdev0, mddev->minor_version); |
5599 | if (err < 0) { | |
f72ffdd6 | 5600 | printk(KERN_WARNING |
1da177e4 | 5601 | "md: %s has different UUID to %s\n", |
f72ffdd6 | 5602 | bdevname(rdev->bdev,b), |
1da177e4 LT |
5603 | bdevname(rdev0->bdev,b2)); |
5604 | export_rdev(rdev); | |
5605 | return -EINVAL; | |
5606 | } | |
5607 | } | |
5608 | err = bind_rdev_to_array(rdev, mddev); | |
5609 | if (err) | |
5610 | export_rdev(rdev); | |
5611 | return err; | |
5612 | } | |
5613 | ||
5614 | /* | |
5615 | * add_new_disk can be used once the array is assembled | |
5616 | * to add "hot spares". They must already have a superblock | |
5617 | * written | |
5618 | */ | |
5619 | if (mddev->pers) { | |
5620 | int err; | |
5621 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5622 | printk(KERN_WARNING |
1da177e4 LT |
5623 | "%s: personality does not support diskops!\n", |
5624 | mdname(mddev)); | |
5625 | return -EINVAL; | |
5626 | } | |
7b1e35f6 N |
5627 | if (mddev->persistent) |
5628 | rdev = md_import_device(dev, mddev->major_version, | |
5629 | mddev->minor_version); | |
5630 | else | |
5631 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 5632 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5633 | printk(KERN_WARNING |
1da177e4 LT |
5634 | "md: md_import_device returned %ld\n", |
5635 | PTR_ERR(rdev)); | |
5636 | return PTR_ERR(rdev); | |
5637 | } | |
1a855a06 | 5638 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5639 | if (!mddev->persistent) { |
5640 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5641 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5642 | rdev->raid_disk = info->raid_disk; |
bf572541 | 5643 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 5644 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 5645 | } else |
41158c7e | 5646 | rdev->raid_disk = -1; |
f466722c | 5647 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
5648 | } else |
5649 | super_types[mddev->major_version]. | |
5650 | validate_super(mddev, rdev); | |
bedd86b7 | 5651 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 5652 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
5653 | /* This was a hot-add request, but events doesn't |
5654 | * match, so reject it. | |
5655 | */ | |
5656 | export_rdev(rdev); | |
5657 | return -EINVAL; | |
5658 | } | |
5659 | ||
b2d444d7 | 5660 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5661 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5662 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5663 | else |
5664 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5665 | |
1da177e4 LT |
5666 | rdev->raid_disk = -1; |
5667 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5668 | if (!err && !mddev->pers->hot_remove_disk) { |
5669 | /* If there is hot_add_disk but no hot_remove_disk | |
5670 | * then added disks for geometry changes, | |
5671 | * and should be added immediately. | |
5672 | */ | |
5673 | super_types[mddev->major_version]. | |
5674 | validate_super(mddev, rdev); | |
5675 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5676 | if (err) | |
5677 | unbind_rdev_from_array(rdev); | |
5678 | } | |
1da177e4 LT |
5679 | if (err) |
5680 | export_rdev(rdev); | |
52664732 | 5681 | else |
00bcb4ac | 5682 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5683 | |
7ceb17e8 | 5684 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
72a23c21 NB |
5685 | if (mddev->degraded) |
5686 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5687 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5688 | if (!err) |
5689 | md_new_event(mddev); | |
005eca5e | 5690 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5691 | return err; |
5692 | } | |
5693 | ||
5694 | /* otherwise, add_new_disk is only allowed | |
5695 | * for major_version==0 superblocks | |
5696 | */ | |
5697 | if (mddev->major_version != 0) { | |
5698 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5699 | mdname(mddev)); | |
5700 | return -EINVAL; | |
5701 | } | |
5702 | ||
5703 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5704 | int err; | |
d710e138 | 5705 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5706 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5707 | printk(KERN_WARNING |
1da177e4 LT |
5708 | "md: error, md_import_device() returned %ld\n", |
5709 | PTR_ERR(rdev)); | |
5710 | return PTR_ERR(rdev); | |
5711 | } | |
5712 | rdev->desc_nr = info->number; | |
5713 | if (info->raid_disk < mddev->raid_disks) | |
5714 | rdev->raid_disk = info->raid_disk; | |
5715 | else | |
5716 | rdev->raid_disk = -1; | |
5717 | ||
1da177e4 | 5718 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5719 | if (info->state & (1<<MD_DISK_SYNC)) |
5720 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5721 | |
8ddf9efe N |
5722 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5723 | set_bit(WriteMostly, &rdev->flags); | |
5724 | ||
1da177e4 LT |
5725 | if (!mddev->persistent) { |
5726 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5727 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5728 | } else | |
57b2caa3 | 5729 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5730 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5731 | |
2bf071bf N |
5732 | err = bind_rdev_to_array(rdev, mddev); |
5733 | if (err) { | |
5734 | export_rdev(rdev); | |
5735 | return err; | |
5736 | } | |
1da177e4 LT |
5737 | } |
5738 | ||
5739 | return 0; | |
5740 | } | |
5741 | ||
f72ffdd6 | 5742 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5743 | { |
5744 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 5745 | struct md_rdev *rdev; |
1da177e4 | 5746 | |
1da177e4 LT |
5747 | rdev = find_rdev(mddev, dev); |
5748 | if (!rdev) | |
5749 | return -ENXIO; | |
5750 | ||
3ea8929d N |
5751 | clear_bit(Blocked, &rdev->flags); |
5752 | remove_and_add_spares(mddev, rdev); | |
5753 | ||
1da177e4 LT |
5754 | if (rdev->raid_disk >= 0) |
5755 | goto busy; | |
5756 | ||
5757 | kick_rdev_from_array(rdev); | |
850b2b42 | 5758 | md_update_sb(mddev, 1); |
d7603b7e | 5759 | md_new_event(mddev); |
1da177e4 LT |
5760 | |
5761 | return 0; | |
5762 | busy: | |
fdefa4d8 | 5763 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5764 | bdevname(rdev->bdev,b), mdname(mddev)); |
5765 | return -EBUSY; | |
5766 | } | |
5767 | ||
f72ffdd6 | 5768 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5769 | { |
5770 | char b[BDEVNAME_SIZE]; | |
5771 | int err; | |
3cb03002 | 5772 | struct md_rdev *rdev; |
1da177e4 LT |
5773 | |
5774 | if (!mddev->pers) | |
5775 | return -ENODEV; | |
5776 | ||
5777 | if (mddev->major_version != 0) { | |
5778 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5779 | " version-0 superblocks.\n", | |
5780 | mdname(mddev)); | |
5781 | return -EINVAL; | |
5782 | } | |
5783 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5784 | printk(KERN_WARNING |
1da177e4 LT |
5785 | "%s: personality does not support diskops!\n", |
5786 | mdname(mddev)); | |
5787 | return -EINVAL; | |
5788 | } | |
5789 | ||
d710e138 | 5790 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5791 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5792 | printk(KERN_WARNING |
1da177e4 LT |
5793 | "md: error, md_import_device() returned %ld\n", |
5794 | PTR_ERR(rdev)); | |
5795 | return -EINVAL; | |
5796 | } | |
5797 | ||
5798 | if (mddev->persistent) | |
57b2caa3 | 5799 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5800 | else |
77304d2a | 5801 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5802 | |
8190e754 | 5803 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5804 | |
b2d444d7 | 5805 | if (test_bit(Faulty, &rdev->flags)) { |
f72ffdd6 | 5806 | printk(KERN_WARNING |
1da177e4 LT |
5807 | "md: can not hot-add faulty %s disk to %s!\n", |
5808 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5809 | err = -EINVAL; | |
5810 | goto abort_export; | |
5811 | } | |
b2d444d7 | 5812 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5813 | rdev->desc_nr = -1; |
5842730d | 5814 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5815 | err = bind_rdev_to_array(rdev, mddev); |
5816 | if (err) | |
5817 | goto abort_export; | |
1da177e4 LT |
5818 | |
5819 | /* | |
5820 | * The rest should better be atomic, we can have disk failures | |
5821 | * noticed in interrupt contexts ... | |
5822 | */ | |
5823 | ||
1da177e4 LT |
5824 | rdev->raid_disk = -1; |
5825 | ||
850b2b42 | 5826 | md_update_sb(mddev, 1); |
1da177e4 LT |
5827 | |
5828 | /* | |
5829 | * Kick recovery, maybe this spare has to be added to the | |
5830 | * array immediately. | |
5831 | */ | |
5832 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5833 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5834 | md_new_event(mddev); |
1da177e4 LT |
5835 | return 0; |
5836 | ||
1da177e4 LT |
5837 | abort_export: |
5838 | export_rdev(rdev); | |
5839 | return err; | |
5840 | } | |
5841 | ||
fd01b88c | 5842 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 5843 | { |
035328c2 | 5844 | int err = 0; |
32a7627c | 5845 | |
36fa3063 | 5846 | if (mddev->pers) { |
d66b1b39 | 5847 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
5848 | return -EBUSY; |
5849 | if (mddev->recovery || mddev->sync_thread) | |
5850 | return -EBUSY; | |
5851 | /* we should be able to change the bitmap.. */ | |
5852 | } | |
32a7627c | 5853 | |
36fa3063 | 5854 | if (fd >= 0) { |
035328c2 | 5855 | struct inode *inode; |
36fa3063 N |
5856 | if (mddev->bitmap) |
5857 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5858 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5859 | |
c3d9714e | 5860 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5861 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5862 | mdname(mddev)); | |
5863 | return -EBADF; | |
5864 | } | |
5865 | ||
035328c2 N |
5866 | inode = mddev->bitmap_info.file->f_mapping->host; |
5867 | if (!S_ISREG(inode->i_mode)) { | |
5868 | printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", | |
5869 | mdname(mddev)); | |
5870 | err = -EBADF; | |
5871 | } else if (!(mddev->bitmap_info.file->f_mode & FMODE_WRITE)) { | |
5872 | printk(KERN_ERR "%s: error: bitmap file must open for write\n", | |
5873 | mdname(mddev)); | |
5874 | err = -EBADF; | |
5875 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
36fa3063 N |
5876 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
5877 | mdname(mddev)); | |
035328c2 N |
5878 | err = -EBUSY; |
5879 | } | |
5880 | if (err) { | |
c3d9714e N |
5881 | fput(mddev->bitmap_info.file); |
5882 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5883 | return err; |
5884 | } | |
c3d9714e | 5885 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5886 | } else if (mddev->bitmap == NULL) |
5887 | return -ENOENT; /* cannot remove what isn't there */ | |
5888 | err = 0; | |
5889 | if (mddev->pers) { | |
5890 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5891 | if (fd >= 0) { |
36fa3063 | 5892 | err = bitmap_create(mddev); |
69e51b44 N |
5893 | if (!err) |
5894 | err = bitmap_load(mddev); | |
5895 | } | |
d7375ab3 | 5896 | if (fd < 0 || err) { |
36fa3063 | 5897 | bitmap_destroy(mddev); |
d7375ab3 N |
5898 | fd = -1; /* make sure to put the file */ |
5899 | } | |
36fa3063 | 5900 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5901 | } |
5902 | if (fd < 0) { | |
035328c2 | 5903 | if (mddev->bitmap_info.file) |
c3d9714e | 5904 | fput(mddev->bitmap_info.file); |
c3d9714e | 5905 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5906 | } |
5907 | ||
32a7627c N |
5908 | return err; |
5909 | } | |
5910 | ||
1da177e4 LT |
5911 | /* |
5912 | * set_array_info is used two different ways | |
5913 | * The original usage is when creating a new array. | |
5914 | * In this usage, raid_disks is > 0 and it together with | |
5915 | * level, size, not_persistent,layout,chunksize determine the | |
5916 | * shape of the array. | |
5917 | * This will always create an array with a type-0.90.0 superblock. | |
5918 | * The newer usage is when assembling an array. | |
5919 | * In this case raid_disks will be 0, and the major_version field is | |
5920 | * use to determine which style super-blocks are to be found on the devices. | |
5921 | * The minor and patch _version numbers are also kept incase the | |
5922 | * super_block handler wishes to interpret them. | |
5923 | */ | |
f72ffdd6 | 5924 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
5925 | { |
5926 | ||
5927 | if (info->raid_disks == 0) { | |
5928 | /* just setting version number for superblock loading */ | |
5929 | if (info->major_version < 0 || | |
50511da3 | 5930 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5931 | super_types[info->major_version].name == NULL) { |
5932 | /* maybe try to auto-load a module? */ | |
f72ffdd6 | 5933 | printk(KERN_INFO |
1da177e4 LT |
5934 | "md: superblock version %d not known\n", |
5935 | info->major_version); | |
5936 | return -EINVAL; | |
5937 | } | |
5938 | mddev->major_version = info->major_version; | |
5939 | mddev->minor_version = info->minor_version; | |
5940 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5941 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5942 | /* ensure mddev_put doesn't delete this now that there |
5943 | * is some minimal configuration. | |
5944 | */ | |
5945 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5946 | return 0; |
5947 | } | |
5948 | mddev->major_version = MD_MAJOR_VERSION; | |
5949 | mddev->minor_version = MD_MINOR_VERSION; | |
5950 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5951 | mddev->ctime = get_seconds(); | |
5952 | ||
5953 | mddev->level = info->level; | |
17115e03 | 5954 | mddev->clevel[0] = 0; |
58c0fed4 | 5955 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5956 | mddev->raid_disks = info->raid_disks; |
5957 | /* don't set md_minor, it is determined by which /dev/md* was | |
5958 | * openned | |
5959 | */ | |
5960 | if (info->state & (1<<MD_SB_CLEAN)) | |
5961 | mddev->recovery_cp = MaxSector; | |
5962 | else | |
5963 | mddev->recovery_cp = 0; | |
5964 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5965 | mddev->external = 0; |
1da177e4 LT |
5966 | |
5967 | mddev->layout = info->layout; | |
9d8f0363 | 5968 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5969 | |
5970 | mddev->max_disks = MD_SB_DISKS; | |
5971 | ||
e691063a N |
5972 | if (mddev->persistent) |
5973 | mddev->flags = 0; | |
850b2b42 | 5974 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5975 | |
c3d9714e | 5976 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 5977 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 5978 | mddev->bitmap_info.offset = 0; |
b2a2703c | 5979 | |
f6705578 N |
5980 | mddev->reshape_position = MaxSector; |
5981 | ||
1da177e4 LT |
5982 | /* |
5983 | * Generate a 128 bit UUID | |
5984 | */ | |
5985 | get_random_bytes(mddev->uuid, 16); | |
5986 | ||
f6705578 | 5987 | mddev->new_level = mddev->level; |
664e7c41 | 5988 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5989 | mddev->new_layout = mddev->layout; |
5990 | mddev->delta_disks = 0; | |
2c810cdd | 5991 | mddev->reshape_backwards = 0; |
f6705578 | 5992 | |
1da177e4 LT |
5993 | return 0; |
5994 | } | |
5995 | ||
fd01b88c | 5996 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 5997 | { |
b522adcd DW |
5998 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5999 | ||
6000 | if (mddev->external_size) | |
6001 | return; | |
6002 | ||
1f403624 DW |
6003 | mddev->array_sectors = array_sectors; |
6004 | } | |
6005 | EXPORT_SYMBOL(md_set_array_sectors); | |
6006 | ||
fd01b88c | 6007 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6008 | { |
3cb03002 | 6009 | struct md_rdev *rdev; |
a35b0d69 | 6010 | int rv; |
d71f9f88 | 6011 | int fit = (num_sectors == 0); |
a35b0d69 N |
6012 | |
6013 | if (mddev->pers->resize == NULL) | |
6014 | return -EINVAL; | |
d71f9f88 AN |
6015 | /* The "num_sectors" is the number of sectors of each device that |
6016 | * is used. This can only make sense for arrays with redundancy. | |
6017 | * linear and raid0 always use whatever space is available. We can only | |
6018 | * consider changing this number if no resync or reconstruction is | |
6019 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6020 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6021 | * of each device. If num_sectors is zero, we find the largest size |
6022 | * that fits. | |
a35b0d69 | 6023 | */ |
f851b60d N |
6024 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
6025 | mddev->sync_thread) | |
a35b0d69 | 6026 | return -EBUSY; |
bd8839e0 N |
6027 | if (mddev->ro) |
6028 | return -EROFS; | |
a4a6125a | 6029 | |
dafb20fa | 6030 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6031 | sector_t avail = rdev->sectors; |
01ab5662 | 6032 | |
d71f9f88 AN |
6033 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6034 | num_sectors = avail; | |
6035 | if (avail < num_sectors) | |
a35b0d69 N |
6036 | return -ENOSPC; |
6037 | } | |
d71f9f88 | 6038 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6039 | if (!rv) |
6040 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6041 | return rv; |
6042 | } | |
6043 | ||
fd01b88c | 6044 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6045 | { |
6046 | int rv; | |
c6563a8c | 6047 | struct md_rdev *rdev; |
da943b99 | 6048 | /* change the number of raid disks */ |
63c70c4f | 6049 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6050 | return -EINVAL; |
bd8839e0 N |
6051 | if (mddev->ro) |
6052 | return -EROFS; | |
da943b99 | 6053 | if (raid_disks <= 0 || |
233fca36 | 6054 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6055 | return -EINVAL; |
f851b60d N |
6056 | if (mddev->sync_thread || |
6057 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6058 | mddev->reshape_position != MaxSector) | |
da943b99 | 6059 | return -EBUSY; |
c6563a8c N |
6060 | |
6061 | rdev_for_each(rdev, mddev) { | |
6062 | if (mddev->raid_disks < raid_disks && | |
6063 | rdev->data_offset < rdev->new_data_offset) | |
6064 | return -EINVAL; | |
6065 | if (mddev->raid_disks > raid_disks && | |
6066 | rdev->data_offset > rdev->new_data_offset) | |
6067 | return -EINVAL; | |
6068 | } | |
6069 | ||
63c70c4f | 6070 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6071 | if (mddev->delta_disks < 0) |
6072 | mddev->reshape_backwards = 1; | |
6073 | else if (mddev->delta_disks > 0) | |
6074 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6075 | |
6076 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6077 | if (rv < 0) { |
de171cb9 | 6078 | mddev->delta_disks = 0; |
2c810cdd N |
6079 | mddev->reshape_backwards = 0; |
6080 | } | |
da943b99 N |
6081 | return rv; |
6082 | } | |
6083 | ||
1da177e4 LT |
6084 | /* |
6085 | * update_array_info is used to change the configuration of an | |
6086 | * on-line array. | |
6087 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6088 | * fields in the info are checked against the array. | |
6089 | * Any differences that cannot be handled will cause an error. | |
6090 | * Normally, only one change can be managed at a time. | |
6091 | */ | |
fd01b88c | 6092 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6093 | { |
6094 | int rv = 0; | |
6095 | int cnt = 0; | |
36fa3063 N |
6096 | int state = 0; |
6097 | ||
6098 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6099 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6100 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6101 | |
6102 | if (mddev->major_version != info->major_version || | |
6103 | mddev->minor_version != info->minor_version || | |
6104 | /* mddev->patch_version != info->patch_version || */ | |
6105 | mddev->ctime != info->ctime || | |
6106 | mddev->level != info->level || | |
6107 | /* mddev->layout != info->layout || */ | |
6108 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 6109 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6110 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6111 | ((state^info->state) & 0xfffffe00) | |
6112 | ) | |
1da177e4 LT |
6113 | return -EINVAL; |
6114 | /* Check there is only one change */ | |
58c0fed4 AN |
6115 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6116 | cnt++; | |
6117 | if (mddev->raid_disks != info->raid_disks) | |
6118 | cnt++; | |
6119 | if (mddev->layout != info->layout) | |
6120 | cnt++; | |
6121 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6122 | cnt++; | |
6123 | if (cnt == 0) | |
6124 | return 0; | |
6125 | if (cnt > 1) | |
6126 | return -EINVAL; | |
1da177e4 LT |
6127 | |
6128 | if (mddev->layout != info->layout) { | |
6129 | /* Change layout | |
6130 | * we don't need to do anything at the md level, the | |
6131 | * personality will take care of it all. | |
6132 | */ | |
50ac168a | 6133 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6134 | return -EINVAL; |
597a711b N |
6135 | else { |
6136 | mddev->new_layout = info->layout; | |
50ac168a | 6137 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6138 | if (rv) |
6139 | mddev->new_layout = mddev->layout; | |
6140 | return rv; | |
6141 | } | |
1da177e4 | 6142 | } |
58c0fed4 | 6143 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6144 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6145 | |
da943b99 N |
6146 | if (mddev->raid_disks != info->raid_disks) |
6147 | rv = update_raid_disks(mddev, info->raid_disks); | |
6148 | ||
36fa3063 | 6149 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
d66b1b39 | 6150 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) |
36fa3063 N |
6151 | return -EINVAL; |
6152 | if (mddev->recovery || mddev->sync_thread) | |
6153 | return -EBUSY; | |
6154 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
6155 | /* add the bitmap */ | |
6156 | if (mddev->bitmap) | |
6157 | return -EEXIST; | |
c3d9714e | 6158 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 6159 | return -EINVAL; |
c3d9714e N |
6160 | mddev->bitmap_info.offset = |
6161 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6162 | mddev->bitmap_info.space = |
6163 | mddev->bitmap_info.default_space; | |
36fa3063 N |
6164 | mddev->pers->quiesce(mddev, 1); |
6165 | rv = bitmap_create(mddev); | |
69e51b44 N |
6166 | if (!rv) |
6167 | rv = bitmap_load(mddev); | |
36fa3063 N |
6168 | if (rv) |
6169 | bitmap_destroy(mddev); | |
6170 | mddev->pers->quiesce(mddev, 0); | |
6171 | } else { | |
6172 | /* remove the bitmap */ | |
6173 | if (!mddev->bitmap) | |
6174 | return -ENOENT; | |
1ec885cd | 6175 | if (mddev->bitmap->storage.file) |
36fa3063 N |
6176 | return -EINVAL; |
6177 | mddev->pers->quiesce(mddev, 1); | |
6178 | bitmap_destroy(mddev); | |
6179 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6180 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6181 | } |
6182 | } | |
850b2b42 | 6183 | md_update_sb(mddev, 1); |
1da177e4 LT |
6184 | return rv; |
6185 | } | |
6186 | ||
fd01b88c | 6187 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6188 | { |
3cb03002 | 6189 | struct md_rdev *rdev; |
1ca69c4b | 6190 | int err = 0; |
1da177e4 LT |
6191 | |
6192 | if (mddev->pers == NULL) | |
6193 | return -ENODEV; | |
6194 | ||
1ca69c4b N |
6195 | rcu_read_lock(); |
6196 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6197 | if (!rdev) |
1ca69c4b N |
6198 | err = -ENODEV; |
6199 | else { | |
6200 | md_error(mddev, rdev); | |
6201 | if (!test_bit(Faulty, &rdev->flags)) | |
6202 | err = -EBUSY; | |
6203 | } | |
6204 | rcu_read_unlock(); | |
6205 | return err; | |
1da177e4 LT |
6206 | } |
6207 | ||
2f9618ce AN |
6208 | /* |
6209 | * We have a problem here : there is no easy way to give a CHS | |
6210 | * virtual geometry. We currently pretend that we have a 2 heads | |
6211 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6212 | * dosfs just mad... ;-) | |
6213 | */ | |
a885c8c4 CH |
6214 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6215 | { | |
fd01b88c | 6216 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6217 | |
6218 | geo->heads = 2; | |
6219 | geo->sectors = 4; | |
49ce6cea | 6220 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6221 | return 0; |
6222 | } | |
6223 | ||
cb335f88 NS |
6224 | static inline bool md_ioctl_valid(unsigned int cmd) |
6225 | { | |
6226 | switch (cmd) { | |
6227 | case ADD_NEW_DISK: | |
6228 | case BLKROSET: | |
6229 | case GET_ARRAY_INFO: | |
6230 | case GET_BITMAP_FILE: | |
6231 | case GET_DISK_INFO: | |
6232 | case HOT_ADD_DISK: | |
6233 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
6234 | case RAID_AUTORUN: |
6235 | case RAID_VERSION: | |
6236 | case RESTART_ARRAY_RW: | |
6237 | case RUN_ARRAY: | |
6238 | case SET_ARRAY_INFO: | |
6239 | case SET_BITMAP_FILE: | |
6240 | case SET_DISK_FAULTY: | |
6241 | case STOP_ARRAY: | |
6242 | case STOP_ARRAY_RO: | |
6243 | return true; | |
6244 | default: | |
6245 | return false; | |
6246 | } | |
6247 | } | |
6248 | ||
a39907fa | 6249 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6250 | unsigned int cmd, unsigned long arg) |
6251 | { | |
6252 | int err = 0; | |
6253 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6254 | struct mddev *mddev = NULL; |
e2218350 | 6255 | int ro; |
1da177e4 | 6256 | |
cb335f88 NS |
6257 | if (!md_ioctl_valid(cmd)) |
6258 | return -ENOTTY; | |
6259 | ||
506c9e44 N |
6260 | switch (cmd) { |
6261 | case RAID_VERSION: | |
6262 | case GET_ARRAY_INFO: | |
6263 | case GET_DISK_INFO: | |
6264 | break; | |
6265 | default: | |
6266 | if (!capable(CAP_SYS_ADMIN)) | |
6267 | return -EACCES; | |
6268 | } | |
1da177e4 LT |
6269 | |
6270 | /* | |
6271 | * Commands dealing with the RAID driver but not any | |
6272 | * particular array: | |
6273 | */ | |
c02c0aeb N |
6274 | switch (cmd) { |
6275 | case RAID_VERSION: | |
6276 | err = get_version(argp); | |
3adc28d8 | 6277 | goto out; |
1da177e4 | 6278 | |
1da177e4 | 6279 | #ifndef MODULE |
c02c0aeb N |
6280 | case RAID_AUTORUN: |
6281 | err = 0; | |
6282 | autostart_arrays(arg); | |
3adc28d8 | 6283 | goto out; |
1da177e4 | 6284 | #endif |
c02c0aeb | 6285 | default:; |
1da177e4 LT |
6286 | } |
6287 | ||
6288 | /* | |
6289 | * Commands creating/starting a new array: | |
6290 | */ | |
6291 | ||
a39907fa | 6292 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6293 | |
6294 | if (!mddev) { | |
6295 | BUG(); | |
3adc28d8 | 6296 | goto out; |
1da177e4 LT |
6297 | } |
6298 | ||
1ca69c4b N |
6299 | /* Some actions do not requires the mutex */ |
6300 | switch (cmd) { | |
6301 | case GET_ARRAY_INFO: | |
6302 | if (!mddev->raid_disks && !mddev->external) | |
6303 | err = -ENODEV; | |
6304 | else | |
6305 | err = get_array_info(mddev, argp); | |
3adc28d8 | 6306 | goto out; |
1ca69c4b N |
6307 | |
6308 | case GET_DISK_INFO: | |
6309 | if (!mddev->raid_disks && !mddev->external) | |
6310 | err = -ENODEV; | |
6311 | else | |
6312 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 6313 | goto out; |
1ca69c4b N |
6314 | |
6315 | case SET_DISK_FAULTY: | |
6316 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6317 | goto out; |
1ca69c4b N |
6318 | } |
6319 | ||
a7a3f08d N |
6320 | if (cmd == ADD_NEW_DISK) |
6321 | /* need to ensure md_delayed_delete() has completed */ | |
6322 | flush_workqueue(md_misc_wq); | |
6323 | ||
90f5f7ad HR |
6324 | if (cmd == HOT_REMOVE_DISK) |
6325 | /* need to ensure recovery thread has run */ | |
6326 | wait_event_interruptible_timeout(mddev->sb_wait, | |
6327 | !test_bit(MD_RECOVERY_NEEDED, | |
6328 | &mddev->flags), | |
6329 | msecs_to_jiffies(5000)); | |
260fa034 N |
6330 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
6331 | /* Need to flush page cache, and ensure no-one else opens | |
6332 | * and writes | |
6333 | */ | |
6334 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 6335 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
6336 | mutex_unlock(&mddev->open_mutex); |
6337 | err = -EBUSY; | |
3adc28d8 | 6338 | goto out; |
260fa034 N |
6339 | } |
6340 | set_bit(MD_STILL_CLOSED, &mddev->flags); | |
6341 | mutex_unlock(&mddev->open_mutex); | |
6342 | sync_blockdev(bdev); | |
6343 | } | |
1da177e4 LT |
6344 | err = mddev_lock(mddev); |
6345 | if (err) { | |
f72ffdd6 | 6346 | printk(KERN_INFO |
1da177e4 LT |
6347 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
6348 | err, cmd); | |
3adc28d8 | 6349 | goto out; |
1da177e4 LT |
6350 | } |
6351 | ||
c02c0aeb N |
6352 | if (cmd == SET_ARRAY_INFO) { |
6353 | mdu_array_info_t info; | |
6354 | if (!arg) | |
6355 | memset(&info, 0, sizeof(info)); | |
6356 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6357 | err = -EFAULT; | |
3adc28d8 | 6358 | goto unlock; |
c02c0aeb N |
6359 | } |
6360 | if (mddev->pers) { | |
6361 | err = update_array_info(mddev, &info); | |
6362 | if (err) { | |
6363 | printk(KERN_WARNING "md: couldn't update" | |
6364 | " array info. %d\n", err); | |
3adc28d8 | 6365 | goto unlock; |
1da177e4 | 6366 | } |
3adc28d8 | 6367 | goto unlock; |
c02c0aeb N |
6368 | } |
6369 | if (!list_empty(&mddev->disks)) { | |
6370 | printk(KERN_WARNING | |
6371 | "md: array %s already has disks!\n", | |
6372 | mdname(mddev)); | |
6373 | err = -EBUSY; | |
3adc28d8 | 6374 | goto unlock; |
c02c0aeb N |
6375 | } |
6376 | if (mddev->raid_disks) { | |
6377 | printk(KERN_WARNING | |
6378 | "md: array %s already initialised!\n", | |
6379 | mdname(mddev)); | |
6380 | err = -EBUSY; | |
3adc28d8 | 6381 | goto unlock; |
c02c0aeb N |
6382 | } |
6383 | err = set_array_info(mddev, &info); | |
6384 | if (err) { | |
6385 | printk(KERN_WARNING "md: couldn't set" | |
6386 | " array info. %d\n", err); | |
3adc28d8 | 6387 | goto unlock; |
c02c0aeb | 6388 | } |
3adc28d8 | 6389 | goto unlock; |
1da177e4 LT |
6390 | } |
6391 | ||
6392 | /* | |
6393 | * Commands querying/configuring an existing array: | |
6394 | */ | |
32a7627c | 6395 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6396 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6397 | if ((!mddev->raid_disks && !mddev->external) |
6398 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6399 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6400 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 6401 | err = -ENODEV; |
3adc28d8 | 6402 | goto unlock; |
1da177e4 LT |
6403 | } |
6404 | ||
6405 | /* | |
6406 | * Commands even a read-only array can execute: | |
6407 | */ | |
c02c0aeb N |
6408 | switch (cmd) { |
6409 | case GET_BITMAP_FILE: | |
6410 | err = get_bitmap_file(mddev, argp); | |
3adc28d8 | 6411 | goto unlock; |
32a7627c | 6412 | |
c02c0aeb N |
6413 | case RESTART_ARRAY_RW: |
6414 | err = restart_array(mddev); | |
3adc28d8 | 6415 | goto unlock; |
1da177e4 | 6416 | |
c02c0aeb N |
6417 | case STOP_ARRAY: |
6418 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 6419 | goto unlock; |
1da177e4 | 6420 | |
c02c0aeb N |
6421 | case STOP_ARRAY_RO: |
6422 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 6423 | goto unlock; |
1da177e4 | 6424 | |
3ea8929d N |
6425 | case HOT_REMOVE_DISK: |
6426 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6427 | goto unlock; |
3ea8929d | 6428 | |
7ceb17e8 N |
6429 | case ADD_NEW_DISK: |
6430 | /* We can support ADD_NEW_DISK on read-only arrays | |
6431 | * on if we are re-adding a preexisting device. | |
6432 | * So require mddev->pers and MD_DISK_SYNC. | |
6433 | */ | |
6434 | if (mddev->pers) { | |
6435 | mdu_disk_info_t info; | |
6436 | if (copy_from_user(&info, argp, sizeof(info))) | |
6437 | err = -EFAULT; | |
6438 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6439 | /* Need to clear read-only for this */ | |
6440 | break; | |
6441 | else | |
6442 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6443 | goto unlock; |
7ceb17e8 N |
6444 | } |
6445 | break; | |
6446 | ||
c02c0aeb N |
6447 | case BLKROSET: |
6448 | if (get_user(ro, (int __user *)(arg))) { | |
6449 | err = -EFAULT; | |
3adc28d8 | 6450 | goto unlock; |
c02c0aeb N |
6451 | } |
6452 | err = -EINVAL; | |
e2218350 | 6453 | |
c02c0aeb N |
6454 | /* if the bdev is going readonly the value of mddev->ro |
6455 | * does not matter, no writes are coming | |
6456 | */ | |
6457 | if (ro) | |
3adc28d8 | 6458 | goto unlock; |
e2218350 | 6459 | |
c02c0aeb N |
6460 | /* are we are already prepared for writes? */ |
6461 | if (mddev->ro != 1) | |
3adc28d8 | 6462 | goto unlock; |
e2218350 | 6463 | |
c02c0aeb N |
6464 | /* transitioning to readauto need only happen for |
6465 | * arrays that call md_write_start | |
6466 | */ | |
6467 | if (mddev->pers) { | |
6468 | err = restart_array(mddev); | |
6469 | if (err == 0) { | |
6470 | mddev->ro = 2; | |
6471 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6472 | } |
c02c0aeb | 6473 | } |
3adc28d8 | 6474 | goto unlock; |
1da177e4 LT |
6475 | } |
6476 | ||
6477 | /* | |
6478 | * The remaining ioctls are changing the state of the | |
f91de92e | 6479 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 6480 | */ |
326eb17d | 6481 | if (mddev->ro && mddev->pers) { |
f91de92e N |
6482 | if (mddev->ro == 2) { |
6483 | mddev->ro = 0; | |
00bcb4ac | 6484 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6485 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6486 | /* mddev_unlock will wake thread */ |
6487 | /* If a device failed while we were read-only, we | |
6488 | * need to make sure the metadata is updated now. | |
6489 | */ | |
6490 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6491 | mddev_unlock(mddev); | |
6492 | wait_event(mddev->sb_wait, | |
6493 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6494 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
29f097c4 | 6495 | mddev_lock_nointr(mddev); |
f3378b48 | 6496 | } |
f91de92e N |
6497 | } else { |
6498 | err = -EROFS; | |
3adc28d8 | 6499 | goto unlock; |
f91de92e | 6500 | } |
1da177e4 LT |
6501 | } |
6502 | ||
c02c0aeb N |
6503 | switch (cmd) { |
6504 | case ADD_NEW_DISK: | |
1da177e4 | 6505 | { |
c02c0aeb N |
6506 | mdu_disk_info_t info; |
6507 | if (copy_from_user(&info, argp, sizeof(info))) | |
6508 | err = -EFAULT; | |
6509 | else | |
6510 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6511 | goto unlock; |
c02c0aeb | 6512 | } |
1da177e4 | 6513 | |
c02c0aeb N |
6514 | case HOT_ADD_DISK: |
6515 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6516 | goto unlock; |
1da177e4 | 6517 | |
c02c0aeb N |
6518 | case RUN_ARRAY: |
6519 | err = do_md_run(mddev); | |
3adc28d8 | 6520 | goto unlock; |
1da177e4 | 6521 | |
c02c0aeb N |
6522 | case SET_BITMAP_FILE: |
6523 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 6524 | goto unlock; |
32a7627c | 6525 | |
c02c0aeb N |
6526 | default: |
6527 | err = -EINVAL; | |
3adc28d8 | 6528 | goto unlock; |
1da177e4 LT |
6529 | } |
6530 | ||
3adc28d8 | 6531 | unlock: |
d3374825 N |
6532 | if (mddev->hold_active == UNTIL_IOCTL && |
6533 | err != -EINVAL) | |
6534 | mddev->hold_active = 0; | |
1da177e4 | 6535 | mddev_unlock(mddev); |
3adc28d8 | 6536 | out: |
1da177e4 LT |
6537 | return err; |
6538 | } | |
aa98aa31 AB |
6539 | #ifdef CONFIG_COMPAT |
6540 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6541 | unsigned int cmd, unsigned long arg) | |
6542 | { | |
6543 | switch (cmd) { | |
6544 | case HOT_REMOVE_DISK: | |
6545 | case HOT_ADD_DISK: | |
6546 | case SET_DISK_FAULTY: | |
6547 | case SET_BITMAP_FILE: | |
6548 | /* These take in integer arg, do not convert */ | |
6549 | break; | |
6550 | default: | |
6551 | arg = (unsigned long)compat_ptr(arg); | |
6552 | break; | |
6553 | } | |
6554 | ||
6555 | return md_ioctl(bdev, mode, cmd, arg); | |
6556 | } | |
6557 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6558 | |
a39907fa | 6559 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6560 | { |
6561 | /* | |
6562 | * Succeed if we can lock the mddev, which confirms that | |
6563 | * it isn't being stopped right now. | |
6564 | */ | |
fd01b88c | 6565 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6566 | int err; |
6567 | ||
0c098220 YL |
6568 | if (!mddev) |
6569 | return -ENODEV; | |
6570 | ||
d3374825 N |
6571 | if (mddev->gendisk != bdev->bd_disk) { |
6572 | /* we are racing with mddev_put which is discarding this | |
6573 | * bd_disk. | |
6574 | */ | |
6575 | mddev_put(mddev); | |
6576 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6577 | flush_workqueue(md_misc_wq); |
d3374825 N |
6578 | /* Then retry the open from the top */ |
6579 | return -ERESTARTSYS; | |
6580 | } | |
6581 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6582 | ||
c8c00a69 | 6583 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6584 | goto out; |
6585 | ||
6586 | err = 0; | |
f2ea68cf | 6587 | atomic_inc(&mddev->openers); |
260fa034 | 6588 | clear_bit(MD_STILL_CLOSED, &mddev->flags); |
c8c00a69 | 6589 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6590 | |
f0b4f7e2 | 6591 | check_disk_change(bdev); |
1da177e4 LT |
6592 | out: |
6593 | return err; | |
6594 | } | |
6595 | ||
db2a144b | 6596 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6597 | { |
f72ffdd6 | 6598 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6599 | |
52e5f9d1 | 6600 | BUG_ON(!mddev); |
f2ea68cf | 6601 | atomic_dec(&mddev->openers); |
1da177e4 | 6602 | mddev_put(mddev); |
1da177e4 | 6603 | } |
f0b4f7e2 N |
6604 | |
6605 | static int md_media_changed(struct gendisk *disk) | |
6606 | { | |
fd01b88c | 6607 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6608 | |
6609 | return mddev->changed; | |
6610 | } | |
6611 | ||
6612 | static int md_revalidate(struct gendisk *disk) | |
6613 | { | |
fd01b88c | 6614 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6615 | |
6616 | mddev->changed = 0; | |
6617 | return 0; | |
6618 | } | |
83d5cde4 | 6619 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6620 | { |
6621 | .owner = THIS_MODULE, | |
a39907fa AV |
6622 | .open = md_open, |
6623 | .release = md_release, | |
b492b852 | 6624 | .ioctl = md_ioctl, |
aa98aa31 AB |
6625 | #ifdef CONFIG_COMPAT |
6626 | .compat_ioctl = md_compat_ioctl, | |
6627 | #endif | |
a885c8c4 | 6628 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6629 | .media_changed = md_media_changed, |
6630 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6631 | }; |
6632 | ||
f72ffdd6 | 6633 | static int md_thread(void *arg) |
1da177e4 | 6634 | { |
2b8bf345 | 6635 | struct md_thread *thread = arg; |
1da177e4 | 6636 | |
1da177e4 LT |
6637 | /* |
6638 | * md_thread is a 'system-thread', it's priority should be very | |
6639 | * high. We avoid resource deadlocks individually in each | |
6640 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6641 | * the very same RT priority as kswapd, thus we will never get | |
6642 | * into a priority inversion deadlock. | |
6643 | * | |
6644 | * we definitely have to have equal or higher priority than | |
6645 | * bdflush, otherwise bdflush will deadlock if there are too | |
6646 | * many dirty RAID5 blocks. | |
6647 | */ | |
1da177e4 | 6648 | |
6985c43f | 6649 | allow_signal(SIGKILL); |
a6fb0934 | 6650 | while (!kthread_should_stop()) { |
1da177e4 | 6651 | |
93588e22 N |
6652 | /* We need to wait INTERRUPTIBLE so that |
6653 | * we don't add to the load-average. | |
6654 | * That means we need to be sure no signals are | |
6655 | * pending | |
6656 | */ | |
6657 | if (signal_pending(current)) | |
6658 | flush_signals(current); | |
6659 | ||
6660 | wait_event_interruptible_timeout | |
6661 | (thread->wqueue, | |
6662 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6663 | || kthread_should_stop(), | |
6664 | thread->timeout); | |
1da177e4 | 6665 | |
6c987910 N |
6666 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6667 | if (!kthread_should_stop()) | |
4ed8731d | 6668 | thread->run(thread); |
1da177e4 | 6669 | } |
a6fb0934 | 6670 | |
1da177e4 LT |
6671 | return 0; |
6672 | } | |
6673 | ||
2b8bf345 | 6674 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
6675 | { |
6676 | if (thread) { | |
36a4e1fe | 6677 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
6678 | set_bit(THREAD_WAKEUP, &thread->flags); |
6679 | wake_up(&thread->wqueue); | |
6680 | } | |
6681 | } | |
6c144d31 | 6682 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 6683 | |
4ed8731d SL |
6684 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
6685 | struct mddev *mddev, const char *name) | |
1da177e4 | 6686 | { |
2b8bf345 | 6687 | struct md_thread *thread; |
1da177e4 | 6688 | |
2b8bf345 | 6689 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
6690 | if (!thread) |
6691 | return NULL; | |
6692 | ||
1da177e4 LT |
6693 | init_waitqueue_head(&thread->wqueue); |
6694 | ||
1da177e4 LT |
6695 | thread->run = run; |
6696 | thread->mddev = mddev; | |
32a7627c | 6697 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6698 | thread->tsk = kthread_run(md_thread, thread, |
6699 | "%s_%s", | |
6700 | mdname(thread->mddev), | |
0232605d | 6701 | name); |
a6fb0934 | 6702 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6703 | kfree(thread); |
6704 | return NULL; | |
6705 | } | |
1da177e4 LT |
6706 | return thread; |
6707 | } | |
6c144d31 | 6708 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 6709 | |
2b8bf345 | 6710 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 6711 | { |
2b8bf345 | 6712 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
6713 | if (!thread) |
6714 | return; | |
36a4e1fe | 6715 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
6716 | /* Locking ensures that mddev_unlock does not wake_up a |
6717 | * non-existent thread | |
6718 | */ | |
6719 | spin_lock(&pers_lock); | |
6720 | *threadp = NULL; | |
6721 | spin_unlock(&pers_lock); | |
a6fb0934 N |
6722 | |
6723 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6724 | kfree(thread); |
6725 | } | |
6c144d31 | 6726 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 6727 | |
fd01b88c | 6728 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 6729 | { |
b2d444d7 | 6730 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6731 | return; |
6bfe0b49 | 6732 | |
de393cde | 6733 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
6734 | return; |
6735 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6736 | if (mddev->degraded) |
6737 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6738 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6739 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6740 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6741 | md_wakeup_thread(mddev->thread); | |
768a418d | 6742 | if (mddev->event_work.func) |
e804ac78 | 6743 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6744 | md_new_event_inintr(mddev); |
1da177e4 | 6745 | } |
6c144d31 | 6746 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
6747 | |
6748 | /* seq_file implementation /proc/mdstat */ | |
6749 | ||
6750 | static void status_unused(struct seq_file *seq) | |
6751 | { | |
6752 | int i = 0; | |
3cb03002 | 6753 | struct md_rdev *rdev; |
1da177e4 LT |
6754 | |
6755 | seq_printf(seq, "unused devices: "); | |
6756 | ||
159ec1fc | 6757 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6758 | char b[BDEVNAME_SIZE]; |
6759 | i++; | |
6760 | seq_printf(seq, "%s ", | |
6761 | bdevname(rdev->bdev,b)); | |
6762 | } | |
6763 | if (!i) | |
6764 | seq_printf(seq, "<none>"); | |
6765 | ||
6766 | seq_printf(seq, "\n"); | |
6767 | } | |
6768 | ||
f72ffdd6 | 6769 | static void status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 6770 | { |
dd71cf6b N |
6771 | sector_t max_sectors, resync, res; |
6772 | unsigned long dt, db; | |
6773 | sector_t rt; | |
4588b42e N |
6774 | int scale; |
6775 | unsigned int per_milli; | |
1da177e4 | 6776 | |
72f36d59 N |
6777 | if (mddev->curr_resync <= 3) |
6778 | resync = 0; | |
6779 | else | |
6780 | resync = mddev->curr_resync | |
6781 | - atomic_read(&mddev->recovery_active); | |
1da177e4 | 6782 | |
c804cdec N |
6783 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
6784 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 6785 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6786 | else |
dd71cf6b | 6787 | max_sectors = mddev->dev_sectors; |
1da177e4 | 6788 | |
403df478 | 6789 | WARN_ON(max_sectors == 0); |
4588b42e | 6790 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6791 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6792 | * u32, as those are the requirements for sector_div. |
6793 | * Thus 'scale' must be at least 10 | |
6794 | */ | |
6795 | scale = 10; | |
6796 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6797 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6798 | scale++; |
6799 | } | |
6800 | res = (resync>>scale)*1000; | |
dd71cf6b | 6801 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6802 | |
6803 | per_milli = res; | |
1da177e4 | 6804 | { |
4588b42e | 6805 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6806 | seq_printf(seq, "["); |
6807 | for (i = 0; i < x; i++) | |
6808 | seq_printf(seq, "="); | |
6809 | seq_printf(seq, ">"); | |
6810 | for (i = 0; i < y; i++) | |
6811 | seq_printf(seq, "."); | |
6812 | seq_printf(seq, "] "); | |
6813 | } | |
4588b42e | 6814 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6815 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6816 | "reshape" : | |
61df9d91 N |
6817 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6818 | "check" : | |
6819 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6820 | "resync" : "recovery"))), | |
6821 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6822 | (unsigned long long) resync/2, |
6823 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6824 | |
6825 | /* | |
1da177e4 LT |
6826 | * dt: time from mark until now |
6827 | * db: blocks written from mark until now | |
6828 | * rt: remaining time | |
dd71cf6b N |
6829 | * |
6830 | * rt is a sector_t, so could be 32bit or 64bit. | |
6831 | * So we divide before multiply in case it is 32bit and close | |
6832 | * to the limit. | |
25985edc | 6833 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6834 | * near the end of resync when the number of remaining sectors |
6835 | * is close to 'db'. | |
6836 | * We then divide rt by 32 after multiplying by db to compensate. | |
6837 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6838 | */ |
6839 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6840 | if (!dt) dt++; | |
ff4e8d9a N |
6841 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6842 | - mddev->resync_mark_cnt; | |
1da177e4 | 6843 | |
dd71cf6b N |
6844 | rt = max_sectors - resync; /* number of remaining sectors */ |
6845 | sector_div(rt, db/32+1); | |
6846 | rt *= dt; | |
6847 | rt >>= 5; | |
6848 | ||
6849 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6850 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6851 | |
ff4e8d9a | 6852 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6853 | } |
6854 | ||
6855 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6856 | { | |
6857 | struct list_head *tmp; | |
6858 | loff_t l = *pos; | |
fd01b88c | 6859 | struct mddev *mddev; |
1da177e4 LT |
6860 | |
6861 | if (l >= 0x10000) | |
6862 | return NULL; | |
6863 | if (!l--) | |
6864 | /* header */ | |
6865 | return (void*)1; | |
6866 | ||
6867 | spin_lock(&all_mddevs_lock); | |
6868 | list_for_each(tmp,&all_mddevs) | |
6869 | if (!l--) { | |
fd01b88c | 6870 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
6871 | mddev_get(mddev); |
6872 | spin_unlock(&all_mddevs_lock); | |
6873 | return mddev; | |
6874 | } | |
6875 | spin_unlock(&all_mddevs_lock); | |
6876 | if (!l--) | |
6877 | return (void*)2;/* tail */ | |
6878 | return NULL; | |
6879 | } | |
6880 | ||
6881 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6882 | { | |
6883 | struct list_head *tmp; | |
fd01b88c | 6884 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 6885 | |
1da177e4 LT |
6886 | ++*pos; |
6887 | if (v == (void*)2) | |
6888 | return NULL; | |
6889 | ||
6890 | spin_lock(&all_mddevs_lock); | |
6891 | if (v == (void*)1) | |
6892 | tmp = all_mddevs.next; | |
6893 | else | |
6894 | tmp = mddev->all_mddevs.next; | |
6895 | if (tmp != &all_mddevs) | |
fd01b88c | 6896 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
6897 | else { |
6898 | next_mddev = (void*)2; | |
6899 | *pos = 0x10000; | |
f72ffdd6 | 6900 | } |
1da177e4 LT |
6901 | spin_unlock(&all_mddevs_lock); |
6902 | ||
6903 | if (v != (void*)1) | |
6904 | mddev_put(mddev); | |
6905 | return next_mddev; | |
6906 | ||
6907 | } | |
6908 | ||
6909 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6910 | { | |
fd01b88c | 6911 | struct mddev *mddev = v; |
1da177e4 LT |
6912 | |
6913 | if (mddev && v != (void*)1 && v != (void*)2) | |
6914 | mddev_put(mddev); | |
6915 | } | |
6916 | ||
6917 | static int md_seq_show(struct seq_file *seq, void *v) | |
6918 | { | |
fd01b88c | 6919 | struct mddev *mddev = v; |
dd8ac336 | 6920 | sector_t sectors; |
3cb03002 | 6921 | struct md_rdev *rdev; |
1da177e4 LT |
6922 | |
6923 | if (v == (void*)1) { | |
84fc4b56 | 6924 | struct md_personality *pers; |
1da177e4 LT |
6925 | seq_printf(seq, "Personalities : "); |
6926 | spin_lock(&pers_lock); | |
2604b703 N |
6927 | list_for_each_entry(pers, &pers_list, list) |
6928 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6929 | |
6930 | spin_unlock(&pers_lock); | |
6931 | seq_printf(seq, "\n"); | |
f1514638 | 6932 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
6933 | return 0; |
6934 | } | |
6935 | if (v == (void*)2) { | |
6936 | status_unused(seq); | |
6937 | return 0; | |
6938 | } | |
6939 | ||
5dc5cf7d | 6940 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6941 | return -EINTR; |
5dc5cf7d | 6942 | |
1da177e4 LT |
6943 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6944 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6945 | mddev->pers ? "" : "in"); | |
6946 | if (mddev->pers) { | |
f91de92e | 6947 | if (mddev->ro==1) |
1da177e4 | 6948 | seq_printf(seq, " (read-only)"); |
f91de92e | 6949 | if (mddev->ro==2) |
52720ae7 | 6950 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6951 | seq_printf(seq, " %s", mddev->pers->name); |
6952 | } | |
6953 | ||
dd8ac336 | 6954 | sectors = 0; |
dafb20fa | 6955 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
6956 | char b[BDEVNAME_SIZE]; |
6957 | seq_printf(seq, " %s[%d]", | |
6958 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6959 | if (test_bit(WriteMostly, &rdev->flags)) |
6960 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6961 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6962 | seq_printf(seq, "(F)"); |
6963 | continue; | |
2d78f8c4 N |
6964 | } |
6965 | if (rdev->raid_disk < 0) | |
b325a32e | 6966 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
6967 | if (test_bit(Replacement, &rdev->flags)) |
6968 | seq_printf(seq, "(R)"); | |
dd8ac336 | 6969 | sectors += rdev->sectors; |
1da177e4 LT |
6970 | } |
6971 | ||
6972 | if (!list_empty(&mddev->disks)) { | |
6973 | if (mddev->pers) | |
6974 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6975 | (unsigned long long) |
6976 | mddev->array_sectors / 2); | |
1da177e4 LT |
6977 | else |
6978 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6979 | (unsigned long long)sectors / 2); |
1da177e4 | 6980 | } |
1cd6bf19 N |
6981 | if (mddev->persistent) { |
6982 | if (mddev->major_version != 0 || | |
6983 | mddev->minor_version != 90) { | |
6984 | seq_printf(seq," super %d.%d", | |
6985 | mddev->major_version, | |
6986 | mddev->minor_version); | |
6987 | } | |
e691063a N |
6988 | } else if (mddev->external) |
6989 | seq_printf(seq, " super external:%s", | |
6990 | mddev->metadata_type); | |
6991 | else | |
1cd6bf19 | 6992 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6993 | |
6994 | if (mddev->pers) { | |
d710e138 | 6995 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 6996 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6997 | if (mddev->pers->sync_request) { |
6998 | if (mddev->curr_resync > 2) { | |
d710e138 | 6999 | status_resync(seq, mddev); |
8e1b39d6 | 7000 | seq_printf(seq, "\n "); |
72f36d59 | 7001 | } else if (mddev->curr_resync >= 1) |
8e1b39d6 N |
7002 | seq_printf(seq, "\tresync=DELAYED\n "); |
7003 | else if (mddev->recovery_cp < MaxSector) | |
7004 | seq_printf(seq, "\tresync=PENDING\n "); | |
7005 | } | |
32a7627c N |
7006 | } else |
7007 | seq_printf(seq, "\n "); | |
7008 | ||
57148964 | 7009 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7010 | |
7011 | seq_printf(seq, "\n"); | |
7012 | } | |
7013 | mddev_unlock(mddev); | |
f72ffdd6 | 7014 | |
1da177e4 LT |
7015 | return 0; |
7016 | } | |
7017 | ||
110518bc | 7018 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7019 | .start = md_seq_start, |
7020 | .next = md_seq_next, | |
7021 | .stop = md_seq_stop, | |
7022 | .show = md_seq_show, | |
7023 | }; | |
7024 | ||
7025 | static int md_seq_open(struct inode *inode, struct file *file) | |
7026 | { | |
f1514638 | 7027 | struct seq_file *seq; |
1da177e4 LT |
7028 | int error; |
7029 | ||
7030 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7031 | if (error) |
f1514638 KS |
7032 | return error; |
7033 | ||
7034 | seq = file->private_data; | |
7035 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7036 | return error; |
7037 | } | |
7038 | ||
e2f23b60 | 7039 | static int md_unloading; |
d7603b7e N |
7040 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7041 | { | |
f1514638 | 7042 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7043 | int mask; |
7044 | ||
e2f23b60 | 7045 | if (md_unloading) |
7d7e64f2 | 7046 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7047 | poll_wait(filp, &md_event_waiters, wait); |
7048 | ||
7049 | /* always allow read */ | |
7050 | mask = POLLIN | POLLRDNORM; | |
7051 | ||
f1514638 | 7052 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7053 | mask |= POLLERR | POLLPRI; |
7054 | return mask; | |
7055 | } | |
7056 | ||
fa027c2a | 7057 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7058 | .owner = THIS_MODULE, |
1da177e4 LT |
7059 | .open = md_seq_open, |
7060 | .read = seq_read, | |
7061 | .llseek = seq_lseek, | |
c3f94b40 | 7062 | .release = seq_release_private, |
d7603b7e | 7063 | .poll = mdstat_poll, |
1da177e4 LT |
7064 | }; |
7065 | ||
84fc4b56 | 7066 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7067 | { |
50bd3774 CY |
7068 | printk(KERN_INFO "md: %s personality registered for level %d\n", |
7069 | p->name, p->level); | |
1da177e4 | 7070 | spin_lock(&pers_lock); |
2604b703 | 7071 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7072 | spin_unlock(&pers_lock); |
7073 | return 0; | |
7074 | } | |
6c144d31 | 7075 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7076 | |
84fc4b56 | 7077 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7078 | { |
2604b703 | 7079 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7080 | spin_lock(&pers_lock); |
2604b703 | 7081 | list_del_init(&p->list); |
1da177e4 LT |
7082 | spin_unlock(&pers_lock); |
7083 | return 0; | |
7084 | } | |
6c144d31 | 7085 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7086 | |
fd01b88c | 7087 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7088 | { |
f72ffdd6 | 7089 | struct md_rdev *rdev; |
1da177e4 | 7090 | int idle; |
eea1bf38 | 7091 | int curr_events; |
1da177e4 LT |
7092 | |
7093 | idle = 1; | |
4b80991c N |
7094 | rcu_read_lock(); |
7095 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7096 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7097 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7098 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7099 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7100 | /* sync IO will cause sync_io to increase before the disk_stats |
7101 | * as sync_io is counted when a request starts, and | |
7102 | * disk_stats is counted when it completes. | |
7103 | * So resync activity will cause curr_events to be smaller than | |
7104 | * when there was no such activity. | |
7105 | * non-sync IO will cause disk_stat to increase without | |
7106 | * increasing sync_io so curr_events will (eventually) | |
7107 | * be larger than it was before. Once it becomes | |
7108 | * substantially larger, the test below will cause | |
7109 | * the array to appear non-idle, and resync will slow | |
7110 | * down. | |
7111 | * If there is a lot of outstanding resync activity when | |
7112 | * we set last_event to curr_events, then all that activity | |
7113 | * completing might cause the array to appear non-idle | |
7114 | * and resync will be slowed down even though there might | |
7115 | * not have been non-resync activity. This will only | |
7116 | * happen once though. 'last_events' will soon reflect | |
7117 | * the state where there is little or no outstanding | |
7118 | * resync requests, and further resync activity will | |
7119 | * always make curr_events less than last_events. | |
c0e48521 | 7120 | * |
1da177e4 | 7121 | */ |
eea1bf38 | 7122 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7123 | rdev->last_events = curr_events; |
7124 | idle = 0; | |
7125 | } | |
7126 | } | |
4b80991c | 7127 | rcu_read_unlock(); |
1da177e4 LT |
7128 | return idle; |
7129 | } | |
7130 | ||
fd01b88c | 7131 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7132 | { |
7133 | /* another "blocks" (512byte) blocks have been synced */ | |
7134 | atomic_sub(blocks, &mddev->recovery_active); | |
7135 | wake_up(&mddev->recovery_wait); | |
7136 | if (!ok) { | |
dfc70645 | 7137 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7138 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7139 | md_wakeup_thread(mddev->thread); |
7140 | // stop recovery, signal do_sync .... | |
7141 | } | |
7142 | } | |
6c144d31 | 7143 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 7144 | |
06d91a5f N |
7145 | /* md_write_start(mddev, bi) |
7146 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7147 | * in superblock) before writing, schedule a superblock update |
7148 | * and wait for it to complete. | |
06d91a5f | 7149 | */ |
fd01b88c | 7150 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7151 | { |
0fd62b86 | 7152 | int did_change = 0; |
06d91a5f | 7153 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7154 | return; |
06d91a5f | 7155 | |
f91de92e N |
7156 | BUG_ON(mddev->ro == 1); |
7157 | if (mddev->ro == 2) { | |
7158 | /* need to switch to read/write */ | |
7159 | mddev->ro = 0; | |
7160 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7161 | md_wakeup_thread(mddev->thread); | |
25156198 | 7162 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7163 | did_change = 1; |
f91de92e | 7164 | } |
06d91a5f | 7165 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7166 | if (mddev->safemode == 1) |
7167 | mddev->safemode = 0; | |
06d91a5f | 7168 | if (mddev->in_sync) { |
85572d7c | 7169 | spin_lock(&mddev->lock); |
3d310eb7 N |
7170 | if (mddev->in_sync) { |
7171 | mddev->in_sync = 0; | |
850b2b42 | 7172 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7173 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7174 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7175 | did_change = 1; |
3d310eb7 | 7176 | } |
85572d7c | 7177 | spin_unlock(&mddev->lock); |
06d91a5f | 7178 | } |
0fd62b86 | 7179 | if (did_change) |
00bcb4ac | 7180 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7181 | wait_event(mddev->sb_wait, |
09a44cc1 | 7182 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 | 7183 | } |
6c144d31 | 7184 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 7185 | |
fd01b88c | 7186 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7187 | { |
7188 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7189 | if (mddev->safemode == 2) | |
7190 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7191 | else if (mddev->safemode_delay) |
1da177e4 LT |
7192 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7193 | } | |
7194 | } | |
6c144d31 | 7195 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 7196 | |
2a2275d6 N |
7197 | /* md_allow_write(mddev) |
7198 | * Calling this ensures that the array is marked 'active' so that writes | |
7199 | * may proceed without blocking. It is important to call this before | |
7200 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7201 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7202 | * |
7203 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7204 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7205 | */ |
fd01b88c | 7206 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7207 | { |
7208 | if (!mddev->pers) | |
b5470dc5 | 7209 | return 0; |
2a2275d6 | 7210 | if (mddev->ro) |
b5470dc5 | 7211 | return 0; |
1a0fd497 | 7212 | if (!mddev->pers->sync_request) |
b5470dc5 | 7213 | return 0; |
2a2275d6 | 7214 | |
85572d7c | 7215 | spin_lock(&mddev->lock); |
2a2275d6 N |
7216 | if (mddev->in_sync) { |
7217 | mddev->in_sync = 0; | |
7218 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7219 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7220 | if (mddev->safemode_delay && |
7221 | mddev->safemode == 0) | |
7222 | mddev->safemode = 1; | |
85572d7c | 7223 | spin_unlock(&mddev->lock); |
2a2275d6 | 7224 | md_update_sb(mddev, 0); |
00bcb4ac | 7225 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 | 7226 | } else |
85572d7c | 7227 | spin_unlock(&mddev->lock); |
b5470dc5 | 7228 | |
070dc6dd | 7229 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7230 | return -EAGAIN; |
7231 | else | |
7232 | return 0; | |
2a2275d6 N |
7233 | } |
7234 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7235 | ||
1da177e4 LT |
7236 | #define SYNC_MARKS 10 |
7237 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7238 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7239 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7240 | { |
4ed8731d | 7241 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7242 | struct mddev *mddev2; |
1da177e4 LT |
7243 | unsigned int currspeed = 0, |
7244 | window; | |
ac7e50a3 | 7245 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 7246 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7247 | unsigned long update_time; |
1da177e4 LT |
7248 | sector_t mark_cnt[SYNC_MARKS]; |
7249 | int last_mark,m; | |
7250 | struct list_head *tmp; | |
7251 | sector_t last_check; | |
57afd89f | 7252 | int skipped = 0; |
3cb03002 | 7253 | struct md_rdev *rdev; |
c4a39551 | 7254 | char *desc, *action = NULL; |
7c2c57c9 | 7255 | struct blk_plug plug; |
1da177e4 LT |
7256 | |
7257 | /* just incase thread restarts... */ | |
7258 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7259 | return; | |
3991b31e N |
7260 | if (mddev->ro) {/* never try to sync a read-only array */ |
7261 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 7262 | return; |
3991b31e | 7263 | } |
1da177e4 | 7264 | |
61df9d91 | 7265 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 7266 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 7267 | desc = "data-check"; |
c4a39551 JB |
7268 | action = "check"; |
7269 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 7270 | desc = "requested-resync"; |
c4a39551 JB |
7271 | action = "repair"; |
7272 | } else | |
61df9d91 N |
7273 | desc = "resync"; |
7274 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7275 | desc = "reshape"; | |
7276 | else | |
7277 | desc = "recovery"; | |
7278 | ||
c4a39551 JB |
7279 | mddev->last_sync_action = action ?: desc; |
7280 | ||
1da177e4 LT |
7281 | /* we overload curr_resync somewhat here. |
7282 | * 0 == not engaged in resync at all | |
7283 | * 2 == checking that there is no conflict with another sync | |
7284 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7285 | * commense | |
7286 | * other == active in resync - this many blocks | |
7287 | * | |
7288 | * Before starting a resync we must have set curr_resync to | |
7289 | * 2, and then checked that every "conflicting" array has curr_resync | |
7290 | * less than ours. When we find one that is the same or higher | |
7291 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7292 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7293 | * This will mean we have to start checking from the beginning again. | |
7294 | * | |
7295 | */ | |
7296 | ||
7297 | do { | |
7298 | mddev->curr_resync = 2; | |
7299 | ||
7300 | try_again: | |
404e4b43 | 7301 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 7302 | goto skip; |
29ac4aa3 | 7303 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7304 | if (mddev2 == mddev) |
7305 | continue; | |
90b08710 BS |
7306 | if (!mddev->parallel_resync |
7307 | && mddev2->curr_resync | |
7308 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7309 | DEFINE_WAIT(wq); |
7310 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7311 | /* arbitrarily yield */ | |
7312 | mddev->curr_resync = 1; | |
7313 | wake_up(&resync_wait); | |
7314 | } | |
7315 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7316 | /* no need to wait here, we can wait the next | |
7317 | * time 'round when curr_resync == 2 | |
7318 | */ | |
7319 | continue; | |
9744197c N |
7320 | /* We need to wait 'interruptible' so as not to |
7321 | * contribute to the load average, and not to | |
7322 | * be caught by 'softlockup' | |
7323 | */ | |
7324 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 7325 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 7326 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7327 | printk(KERN_INFO "md: delaying %s of %s" |
7328 | " until %s has finished (they" | |
1da177e4 | 7329 | " share one or more physical units)\n", |
61df9d91 | 7330 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7331 | mddev_put(mddev2); |
9744197c N |
7332 | if (signal_pending(current)) |
7333 | flush_signals(current); | |
1da177e4 LT |
7334 | schedule(); |
7335 | finish_wait(&resync_wait, &wq); | |
7336 | goto try_again; | |
7337 | } | |
7338 | finish_wait(&resync_wait, &wq); | |
7339 | } | |
7340 | } | |
7341 | } while (mddev->curr_resync < 2); | |
7342 | ||
5fd6c1dc | 7343 | j = 0; |
9d88883e | 7344 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7345 | /* resync follows the size requested by the personality, |
57afd89f | 7346 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7347 | */ |
7348 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7349 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7350 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7351 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7352 | j = mddev->resync_min; | |
7353 | else if (!mddev->bitmap) | |
5fd6c1dc | 7354 | j = mddev->recovery_cp; |
5e96ee65 | 7355 | |
ccfcc3c1 | 7356 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7357 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7358 | else { |
1da177e4 | 7359 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7360 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7361 | j = MaxSector; |
4e59ca7d | 7362 | rcu_read_lock(); |
dafb20fa | 7363 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc N |
7364 | if (rdev->raid_disk >= 0 && |
7365 | !test_bit(Faulty, &rdev->flags) && | |
7366 | !test_bit(In_sync, &rdev->flags) && | |
7367 | rdev->recovery_offset < j) | |
7368 | j = rdev->recovery_offset; | |
4e59ca7d | 7369 | rcu_read_unlock(); |
133d4527 N |
7370 | |
7371 | /* If there is a bitmap, we need to make sure all | |
7372 | * writes that started before we added a spare | |
7373 | * complete before we start doing a recovery. | |
7374 | * Otherwise the write might complete and (via | |
7375 | * bitmap_endwrite) set a bit in the bitmap after the | |
7376 | * recovery has checked that bit and skipped that | |
7377 | * region. | |
7378 | */ | |
7379 | if (mddev->bitmap) { | |
7380 | mddev->pers->quiesce(mddev, 1); | |
7381 | mddev->pers->quiesce(mddev, 0); | |
7382 | } | |
5fd6c1dc | 7383 | } |
1da177e4 | 7384 | |
61df9d91 N |
7385 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7386 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7387 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7388 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7389 | "(but not more than %d KB/sec) for %s.\n", |
7390 | speed_max(mddev), desc); | |
1da177e4 | 7391 | |
eea1bf38 | 7392 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7393 | |
57afd89f | 7394 | io_sectors = 0; |
1da177e4 LT |
7395 | for (m = 0; m < SYNC_MARKS; m++) { |
7396 | mark[m] = jiffies; | |
57afd89f | 7397 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7398 | } |
7399 | last_mark = 0; | |
7400 | mddev->resync_mark = mark[last_mark]; | |
7401 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7402 | ||
7403 | /* | |
7404 | * Tune reconstruction: | |
7405 | */ | |
7406 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7407 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7408 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7409 | |
7410 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7411 | last_check = 0; |
7412 | ||
7413 | if (j>2) { | |
c91abf5a | 7414 | printk(KERN_INFO |
61df9d91 N |
7415 | "md: resuming %s of %s from checkpoint.\n", |
7416 | desc, mdname(mddev)); | |
1da177e4 | 7417 | mddev->curr_resync = j; |
72f36d59 N |
7418 | } else |
7419 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7420 | mddev->curr_resync_completed = j; |
72f36d59 N |
7421 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7422 | md_new_event(mddev); | |
54f89341 | 7423 | update_time = jiffies; |
1da177e4 | 7424 | |
7c2c57c9 | 7425 | blk_start_plug(&plug); |
1da177e4 | 7426 | while (j < max_sectors) { |
57afd89f | 7427 | sector_t sectors; |
1da177e4 | 7428 | |
57afd89f | 7429 | skipped = 0; |
97e4f42d | 7430 | |
7a91ee1f N |
7431 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7432 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7433 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7434 | > (max_sectors >> 4)) || | |
54f89341 | 7435 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f N |
7436 | (j - mddev->curr_resync_completed)*2 |
7437 | >= mddev->resync_max - mddev->curr_resync_completed | |
7438 | )) { | |
97e4f42d | 7439 | /* time to update curr_resync_completed */ |
97e4f42d N |
7440 | wait_event(mddev->recovery_wait, |
7441 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7442 | mddev->curr_resync_completed = j; |
35d78c66 | 7443 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
7444 | j > mddev->recovery_cp) | |
7445 | mddev->recovery_cp = j; | |
54f89341 | 7446 | update_time = jiffies; |
070dc6dd | 7447 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7448 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7449 | } |
acb180b0 | 7450 | |
c91abf5a N |
7451 | while (j >= mddev->resync_max && |
7452 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
7453 | /* As this condition is controlled by user-space, |
7454 | * we can block indefinitely, so use '_interruptible' | |
7455 | * to avoid triggering warnings. | |
7456 | */ | |
7457 | flush_signals(current); /* just in case */ | |
7458 | wait_event_interruptible(mddev->recovery_wait, | |
7459 | mddev->resync_max > j | |
c91abf5a N |
7460 | || test_bit(MD_RECOVERY_INTR, |
7461 | &mddev->recovery)); | |
e62e58a5 | 7462 | } |
acb180b0 | 7463 | |
c91abf5a N |
7464 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7465 | break; | |
acb180b0 | 7466 | |
57afd89f | 7467 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7468 | currspeed < speed_min(mddev)); |
57afd89f | 7469 | if (sectors == 0) { |
dfc70645 | 7470 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 7471 | break; |
1da177e4 | 7472 | } |
57afd89f N |
7473 | |
7474 | if (!skipped) { /* actual IO requested */ | |
7475 | io_sectors += sectors; | |
7476 | atomic_add(sectors, &mddev->recovery_active); | |
7477 | } | |
7478 | ||
e875ecea N |
7479 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7480 | break; | |
7481 | ||
1da177e4 | 7482 | j += sectors; |
72f36d59 N |
7483 | if (j > 2) |
7484 | mddev->curr_resync = j; | |
ff4e8d9a | 7485 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7486 | if (last_check == 0) |
e875ecea | 7487 | /* this is the earliest that rebuild will be |
d7603b7e N |
7488 | * visible in /proc/mdstat |
7489 | */ | |
7490 | md_new_event(mddev); | |
57afd89f N |
7491 | |
7492 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7493 | continue; |
7494 | ||
57afd89f | 7495 | last_check = io_sectors; |
1da177e4 LT |
7496 | repeat: |
7497 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7498 | /* step marks */ | |
7499 | int next = (last_mark+1) % SYNC_MARKS; | |
7500 | ||
7501 | mddev->resync_mark = mark[next]; | |
7502 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7503 | mark[next] = jiffies; | |
57afd89f | 7504 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7505 | last_mark = next; |
7506 | } | |
7507 | ||
c91abf5a N |
7508 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7509 | break; | |
1da177e4 LT |
7510 | |
7511 | /* | |
7512 | * this loop exits only if either when we are slower than | |
7513 | * the 'hard' speed limit, or the system was IO-idle for | |
7514 | * a jiffy. | |
7515 | * the system might be non-idle CPU-wise, but we only care | |
7516 | * about not overloading the IO subsystem. (things like an | |
7517 | * e2fsck being done on the RAID array should execute fast) | |
7518 | */ | |
1da177e4 LT |
7519 | cond_resched(); |
7520 | ||
ac7e50a3 XN |
7521 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
7522 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 7523 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 7524 | |
88202a0c N |
7525 | if (currspeed > speed_min(mddev)) { |
7526 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7527 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7528 | msleep(500); |
1da177e4 LT |
7529 | goto repeat; |
7530 | } | |
7531 | } | |
7532 | } | |
c91abf5a N |
7533 | printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
7534 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
7535 | ? "interrupted" : "done"); | |
1da177e4 LT |
7536 | /* |
7537 | * this also signals 'finished resyncing' to md_stop | |
7538 | */ | |
7c2c57c9 | 7539 | blk_finish_plug(&plug); |
1da177e4 LT |
7540 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7541 | ||
7542 | /* tell personality that we are finished */ | |
57afd89f | 7543 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7544 | |
dfc70645 | 7545 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7546 | mddev->curr_resync > 2) { |
7547 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7548 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7549 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7550 | printk(KERN_INFO | |
61df9d91 N |
7551 | "md: checkpointing %s of %s.\n", |
7552 | desc, mdname(mddev)); | |
0a19caab | 7553 | if (test_bit(MD_RECOVERY_ERROR, |
7554 | &mddev->recovery)) | |
7555 | mddev->recovery_cp = | |
7556 | mddev->curr_resync_completed; | |
7557 | else | |
7558 | mddev->recovery_cp = | |
7559 | mddev->curr_resync; | |
5fd6c1dc N |
7560 | } |
7561 | } else | |
7562 | mddev->recovery_cp = MaxSector; | |
7563 | } else { | |
7564 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7565 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 7566 | rcu_read_lock(); |
dafb20fa | 7567 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7568 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7569 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7570 | !test_bit(Faulty, &rdev->flags) && |
7571 | !test_bit(In_sync, &rdev->flags) && | |
7572 | rdev->recovery_offset < mddev->curr_resync) | |
7573 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7574 | rcu_read_unlock(); |
5fd6c1dc | 7575 | } |
1da177e4 | 7576 | } |
db91ff55 | 7577 | skip: |
17571284 | 7578 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7579 | |
c07b70ad N |
7580 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7581 | /* We completed so min/max setting can be forgotten if used. */ | |
7582 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7583 | mddev->resync_min = 0; | |
7584 | mddev->resync_max = MaxSector; | |
7585 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7586 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7587 | mddev->curr_resync = 0; |
7588 | wake_up(&resync_wait); | |
7589 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7590 | md_wakeup_thread(mddev->thread); | |
c6207277 | 7591 | return; |
1da177e4 | 7592 | } |
29269553 | 7593 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7594 | |
746d3207 N |
7595 | static int remove_and_add_spares(struct mddev *mddev, |
7596 | struct md_rdev *this) | |
b4c4c7b8 | 7597 | { |
3cb03002 | 7598 | struct md_rdev *rdev; |
b4c4c7b8 | 7599 | int spares = 0; |
f2a371c5 | 7600 | int removed = 0; |
b4c4c7b8 | 7601 | |
dafb20fa | 7602 | rdev_for_each(rdev, mddev) |
746d3207 N |
7603 | if ((this == NULL || rdev == this) && |
7604 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 7605 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7606 | (test_bit(Faulty, &rdev->flags) || |
7607 | ! test_bit(In_sync, &rdev->flags)) && | |
7608 | atomic_read(&rdev->nr_pending)==0) { | |
7609 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7610 | mddev, rdev) == 0) { |
36fad858 | 7611 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 7612 | rdev->raid_disk = -1; |
f2a371c5 | 7613 | removed++; |
b4c4c7b8 N |
7614 | } |
7615 | } | |
90584fc9 JB |
7616 | if (removed && mddev->kobj.sd) |
7617 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 7618 | |
746d3207 N |
7619 | if (this) |
7620 | goto no_add; | |
7621 | ||
dafb20fa | 7622 | rdev_for_each(rdev, mddev) { |
7bfec5f3 N |
7623 | if (rdev->raid_disk >= 0 && |
7624 | !test_bit(In_sync, &rdev->flags) && | |
7625 | !test_bit(Faulty, &rdev->flags)) | |
7626 | spares++; | |
7ceb17e8 N |
7627 | if (rdev->raid_disk >= 0) |
7628 | continue; | |
7629 | if (test_bit(Faulty, &rdev->flags)) | |
7630 | continue; | |
7631 | if (mddev->ro && | |
8313b8e5 N |
7632 | ! (rdev->saved_raid_disk >= 0 && |
7633 | !test_bit(Bitmap_sync, &rdev->flags))) | |
7ceb17e8 N |
7634 | continue; |
7635 | ||
7eb41885 N |
7636 | if (rdev->saved_raid_disk < 0) |
7637 | rdev->recovery_offset = 0; | |
7ceb17e8 N |
7638 | if (mddev->pers-> |
7639 | hot_add_disk(mddev, rdev) == 0) { | |
7640 | if (sysfs_link_rdev(mddev, rdev)) | |
7641 | /* failure here is OK */; | |
7642 | spares++; | |
7643 | md_new_event(mddev); | |
7644 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 7645 | } |
b4c4c7b8 | 7646 | } |
746d3207 | 7647 | no_add: |
6dafab6b N |
7648 | if (removed) |
7649 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
7650 | return spares; |
7651 | } | |
7ebc0be7 | 7652 | |
ac05f256 N |
7653 | static void md_start_sync(struct work_struct *ws) |
7654 | { | |
7655 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
7656 | ||
7657 | mddev->sync_thread = md_register_thread(md_do_sync, | |
7658 | mddev, | |
7659 | "resync"); | |
7660 | if (!mddev->sync_thread) { | |
7661 | printk(KERN_ERR "%s: could not start resync" | |
7662 | " thread...\n", | |
7663 | mdname(mddev)); | |
7664 | /* leave the spares where they are, it shouldn't hurt */ | |
7665 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7666 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7667 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7668 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7669 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7670 | wake_up(&resync_wait); |
ac05f256 N |
7671 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
7672 | &mddev->recovery)) | |
7673 | if (mddev->sysfs_action) | |
7674 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7675 | } else | |
7676 | md_wakeup_thread(mddev->sync_thread); | |
7677 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7678 | md_new_event(mddev); | |
7679 | } | |
7680 | ||
1da177e4 LT |
7681 | /* |
7682 | * This routine is regularly called by all per-raid-array threads to | |
7683 | * deal with generic issues like resync and super-block update. | |
7684 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7685 | * need this as they never do any recovery or update the superblock. | |
7686 | * | |
7687 | * It does not do any resync itself, but rather "forks" off other threads | |
7688 | * to do that as needed. | |
7689 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7690 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7691 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7692 | * and wakeups up this thread which will reap the thread and finish up. |
7693 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7694 | * | |
7695 | * The overall approach is: | |
7696 | * 1/ if the superblock needs updating, update it. | |
7697 | * 2/ If a recovery thread is running, don't do anything else. | |
7698 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7699 | * 4/ If there are any faulty devices, remove them. | |
7700 | * 5/ If array is degraded, try to add spares devices | |
7701 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7702 | */ | |
fd01b88c | 7703 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 7704 | { |
68866e42 JB |
7705 | if (mddev->suspended) |
7706 | return; | |
7707 | ||
5f40402d | 7708 | if (mddev->bitmap) |
aa5cbd10 | 7709 | bitmap_daemon_work(mddev); |
1da177e4 | 7710 | |
fca4d848 | 7711 | if (signal_pending(current)) { |
31a59e34 | 7712 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7713 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7714 | mdname(mddev)); | |
7715 | mddev->safemode = 2; | |
7716 | } | |
7717 | flush_signals(current); | |
7718 | } | |
7719 | ||
c89a8eee N |
7720 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7721 | return; | |
1da177e4 | 7722 | if ( ! ( |
142d44c3 | 7723 | (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7724 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7725 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7726 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7727 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7728 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7729 | )) |
7730 | return; | |
fca4d848 | 7731 | |
df5b89b3 | 7732 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7733 | int spares = 0; |
fca4d848 | 7734 | |
c89a8eee | 7735 | if (mddev->ro) { |
7ceb17e8 N |
7736 | /* On a read-only array we can: |
7737 | * - remove failed devices | |
7738 | * - add already-in_sync devices if the array itself | |
7739 | * is in-sync. | |
7740 | * As we only add devices that are already in-sync, | |
7741 | * we can activate the spares immediately. | |
c89a8eee | 7742 | */ |
7ceb17e8 | 7743 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
7744 | /* There is no thread, but we need to call |
7745 | * ->spare_active and clear saved_raid_disk | |
7746 | */ | |
2ac295a5 | 7747 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 N |
7748 | md_reap_sync_thread(mddev); |
7749 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
c89a8eee N |
7750 | goto unlock; |
7751 | } | |
7752 | ||
31a59e34 | 7753 | if (!mddev->external) { |
0fd62b86 | 7754 | int did_change = 0; |
85572d7c | 7755 | spin_lock(&mddev->lock); |
31a59e34 N |
7756 | if (mddev->safemode && |
7757 | !atomic_read(&mddev->writes_pending) && | |
7758 | !mddev->in_sync && | |
7759 | mddev->recovery_cp == MaxSector) { | |
7760 | mddev->in_sync = 1; | |
0fd62b86 | 7761 | did_change = 1; |
070dc6dd | 7762 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7763 | } |
7764 | if (mddev->safemode == 1) | |
7765 | mddev->safemode = 0; | |
85572d7c | 7766 | spin_unlock(&mddev->lock); |
0fd62b86 | 7767 | if (did_change) |
00bcb4ac | 7768 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7769 | } |
fca4d848 | 7770 | |
7a0a5355 | 7771 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 7772 | md_update_sb(mddev, 0); |
06d91a5f | 7773 | |
1da177e4 LT |
7774 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7775 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7776 | /* resync/recovery still happening */ | |
7777 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7778 | goto unlock; | |
7779 | } | |
7780 | if (mddev->sync_thread) { | |
a91d5ac0 | 7781 | md_reap_sync_thread(mddev); |
1da177e4 LT |
7782 | goto unlock; |
7783 | } | |
72a23c21 NB |
7784 | /* Set RUNNING before clearing NEEDED to avoid |
7785 | * any transients in the value of "sync_action". | |
7786 | */ | |
72f36d59 | 7787 | mddev->curr_resync_completed = 0; |
72a23c21 | 7788 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
24dd469d N |
7789 | /* Clear some bits that don't mean anything, but |
7790 | * might be left set | |
7791 | */ | |
24dd469d N |
7792 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7793 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7794 | |
ed209584 N |
7795 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
7796 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 7797 | goto not_running; |
1da177e4 LT |
7798 | /* no recovery is running. |
7799 | * remove any failed drives, then | |
7800 | * add spares if possible. | |
72f36d59 | 7801 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
7802 | * the personality to fail the re-add. |
7803 | */ | |
1da177e4 | 7804 | |
b4c4c7b8 | 7805 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7806 | if (mddev->pers->check_reshape == NULL || |
7807 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 7808 | /* Cannot proceed */ |
ac05f256 | 7809 | goto not_running; |
b4c4c7b8 | 7810 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 7811 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 7812 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
7813 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7814 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7815 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7816 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7817 | } else if (mddev->recovery_cp < MaxSector) { |
7818 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7819 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7820 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7821 | /* nothing to be done ... */ | |
ac05f256 | 7822 | goto not_running; |
24dd469d | 7823 | |
1da177e4 | 7824 | if (mddev->pers->sync_request) { |
ef99bf48 | 7825 | if (spares) { |
a654b9d8 N |
7826 | /* We are adding a device or devices to an array |
7827 | * which has the bitmap stored on all devices. | |
7828 | * So make sure all bitmap pages get written | |
7829 | */ | |
7830 | bitmap_write_all(mddev->bitmap); | |
7831 | } | |
ac05f256 N |
7832 | INIT_WORK(&mddev->del_work, md_start_sync); |
7833 | queue_work(md_misc_wq, &mddev->del_work); | |
7834 | goto unlock; | |
1da177e4 | 7835 | } |
ac05f256 | 7836 | not_running: |
72a23c21 NB |
7837 | if (!mddev->sync_thread) { |
7838 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7839 | wake_up(&resync_wait); |
72a23c21 NB |
7840 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
7841 | &mddev->recovery)) | |
0c3573f1 | 7842 | if (mddev->sysfs_action) |
00bcb4ac | 7843 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7844 | } |
ac05f256 N |
7845 | unlock: |
7846 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
7847 | mddev_unlock(mddev); |
7848 | } | |
7849 | } | |
6c144d31 | 7850 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 7851 | |
a91d5ac0 JB |
7852 | void md_reap_sync_thread(struct mddev *mddev) |
7853 | { | |
7854 | struct md_rdev *rdev; | |
7855 | ||
7856 | /* resync has finished, collect result */ | |
7857 | md_unregister_thread(&mddev->sync_thread); | |
7858 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7859 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7860 | /* success...*/ | |
7861 | /* activate any spares */ | |
7862 | if (mddev->pers->spare_active(mddev)) { | |
7863 | sysfs_notify(&mddev->kobj, NULL, | |
7864 | "degraded"); | |
7865 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
7866 | } | |
7867 | } | |
7868 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7869 | mddev->pers->finish_reshape) | |
7870 | mddev->pers->finish_reshape(mddev); | |
7871 | ||
7872 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 7873 | * information must be scrapped. |
a91d5ac0 | 7874 | */ |
f466722c N |
7875 | if (!mddev->degraded) |
7876 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
7877 | rdev->saved_raid_disk = -1; |
7878 | ||
7879 | md_update_sb(mddev, 1); | |
7880 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7881 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7882 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7883 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7884 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 7885 | wake_up(&resync_wait); |
a91d5ac0 JB |
7886 | /* flag recovery needed just to double check */ |
7887 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7888 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7889 | md_new_event(mddev); | |
7890 | if (mddev->event_work.func) | |
7891 | queue_work(md_misc_wq, &mddev->event_work); | |
7892 | } | |
6c144d31 | 7893 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 7894 | |
fd01b88c | 7895 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 7896 | { |
00bcb4ac | 7897 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 7898 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
7899 | !test_bit(Blocked, &rdev->flags) && |
7900 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
7901 | msecs_to_jiffies(5000)); |
7902 | rdev_dec_pending(rdev, mddev); | |
7903 | } | |
7904 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7905 | ||
c6563a8c N |
7906 | void md_finish_reshape(struct mddev *mddev) |
7907 | { | |
7908 | /* called be personality module when reshape completes. */ | |
7909 | struct md_rdev *rdev; | |
7910 | ||
7911 | rdev_for_each(rdev, mddev) { | |
7912 | if (rdev->data_offset > rdev->new_data_offset) | |
7913 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
7914 | else | |
7915 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
7916 | rdev->data_offset = rdev->new_data_offset; | |
7917 | } | |
7918 | } | |
7919 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
7920 | |
7921 | /* Bad block management. | |
7922 | * We can record which blocks on each device are 'bad' and so just | |
7923 | * fail those blocks, or that stripe, rather than the whole device. | |
7924 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7925 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7926 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7927 | * A 'shift' can be set so that larger blocks are tracked and | |
7928 | * consequently larger devices can be covered. | |
7929 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7930 | * | |
7931 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7932 | * might need to retry if it is very unlucky. | |
7933 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7934 | * so we use the write_seqlock_irq variant. | |
7935 | * | |
7936 | * When looking for a bad block we specify a range and want to | |
7937 | * know if any block in the range is bad. So we binary-search | |
7938 | * to the last range that starts at-or-before the given endpoint, | |
7939 | * (or "before the sector after the target range") | |
7940 | * then see if it ends after the given start. | |
7941 | * We return | |
7942 | * 0 if there are no known bad blocks in the range | |
7943 | * 1 if there are known bad block which are all acknowledged | |
7944 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
7945 | * plus the start/length of the first bad section we overlap. | |
7946 | */ | |
7947 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
7948 | sector_t *first_bad, int *bad_sectors) | |
7949 | { | |
7950 | int hi; | |
ab05613a | 7951 | int lo; |
2230dfe4 | 7952 | u64 *p = bb->page; |
ab05613a | 7953 | int rv; |
2230dfe4 N |
7954 | sector_t target = s + sectors; |
7955 | unsigned seq; | |
7956 | ||
7957 | if (bb->shift > 0) { | |
7958 | /* round the start down, and the end up */ | |
7959 | s >>= bb->shift; | |
7960 | target += (1<<bb->shift) - 1; | |
7961 | target >>= bb->shift; | |
7962 | sectors = target - s; | |
7963 | } | |
7964 | /* 'target' is now the first block after the bad range */ | |
7965 | ||
7966 | retry: | |
7967 | seq = read_seqbegin(&bb->lock); | |
ab05613a | 7968 | lo = 0; |
7969 | rv = 0; | |
2230dfe4 N |
7970 | hi = bb->count; |
7971 | ||
7972 | /* Binary search between lo and hi for 'target' | |
7973 | * i.e. for the last range that starts before 'target' | |
7974 | */ | |
7975 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
7976 | * are known not to be the last range before target. | |
7977 | * VARIANT: hi-lo is the number of possible | |
7978 | * ranges, and decreases until it reaches 1 | |
7979 | */ | |
7980 | while (hi - lo > 1) { | |
7981 | int mid = (lo + hi) / 2; | |
7982 | sector_t a = BB_OFFSET(p[mid]); | |
7983 | if (a < target) | |
7984 | /* This could still be the one, earlier ranges | |
7985 | * could not. */ | |
7986 | lo = mid; | |
7987 | else | |
7988 | /* This and later ranges are definitely out. */ | |
7989 | hi = mid; | |
7990 | } | |
7991 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
7992 | if (hi > lo) { | |
7993 | /* need to check all range that end after 's' to see if | |
7994 | * any are unacknowledged. | |
7995 | */ | |
7996 | while (lo >= 0 && | |
7997 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7998 | if (BB_OFFSET(p[lo]) < target) { | |
7999 | /* starts before the end, and finishes after | |
8000 | * the start, so they must overlap | |
8001 | */ | |
8002 | if (rv != -1 && BB_ACK(p[lo])) | |
8003 | rv = 1; | |
8004 | else | |
8005 | rv = -1; | |
8006 | *first_bad = BB_OFFSET(p[lo]); | |
8007 | *bad_sectors = BB_LEN(p[lo]); | |
8008 | } | |
8009 | lo--; | |
8010 | } | |
8011 | } | |
8012 | ||
8013 | if (read_seqretry(&bb->lock, seq)) | |
8014 | goto retry; | |
8015 | ||
8016 | return rv; | |
8017 | } | |
8018 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
8019 | ||
8020 | /* | |
8021 | * Add a range of bad blocks to the table. | |
8022 | * This might extend the table, or might contract it | |
8023 | * if two adjacent ranges can be merged. | |
8024 | * We binary-search to find the 'insertion' point, then | |
8025 | * decide how best to handle it. | |
8026 | */ | |
8027 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
8028 | int acknowledged) | |
8029 | { | |
8030 | u64 *p; | |
8031 | int lo, hi; | |
8032 | int rv = 1; | |
905b0297 | 8033 | unsigned long flags; |
2230dfe4 N |
8034 | |
8035 | if (bb->shift < 0) | |
8036 | /* badblocks are disabled */ | |
8037 | return 0; | |
8038 | ||
8039 | if (bb->shift) { | |
8040 | /* round the start down, and the end up */ | |
8041 | sector_t next = s + sectors; | |
8042 | s >>= bb->shift; | |
8043 | next += (1<<bb->shift) - 1; | |
8044 | next >>= bb->shift; | |
8045 | sectors = next - s; | |
8046 | } | |
8047 | ||
905b0297 | 8048 | write_seqlock_irqsave(&bb->lock, flags); |
2230dfe4 N |
8049 | |
8050 | p = bb->page; | |
8051 | lo = 0; | |
8052 | hi = bb->count; | |
8053 | /* Find the last range that starts at-or-before 's' */ | |
8054 | while (hi - lo > 1) { | |
8055 | int mid = (lo + hi) / 2; | |
8056 | sector_t a = BB_OFFSET(p[mid]); | |
8057 | if (a <= s) | |
8058 | lo = mid; | |
8059 | else | |
8060 | hi = mid; | |
8061 | } | |
8062 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8063 | hi = lo; | |
8064 | ||
8065 | if (hi > lo) { | |
8066 | /* we found a range that might merge with the start | |
8067 | * of our new range | |
8068 | */ | |
8069 | sector_t a = BB_OFFSET(p[lo]); | |
8070 | sector_t e = a + BB_LEN(p[lo]); | |
8071 | int ack = BB_ACK(p[lo]); | |
8072 | if (e >= s) { | |
8073 | /* Yes, we can merge with a previous range */ | |
8074 | if (s == a && s + sectors >= e) | |
8075 | /* new range covers old */ | |
8076 | ack = acknowledged; | |
8077 | else | |
8078 | ack = ack && acknowledged; | |
8079 | ||
8080 | if (e < s + sectors) | |
8081 | e = s + sectors; | |
8082 | if (e - a <= BB_MAX_LEN) { | |
8083 | p[lo] = BB_MAKE(a, e-a, ack); | |
8084 | s = e; | |
8085 | } else { | |
8086 | /* does not all fit in one range, | |
8087 | * make p[lo] maximal | |
8088 | */ | |
8089 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8090 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8091 | s = a + BB_MAX_LEN; | |
8092 | } | |
8093 | sectors = e - s; | |
8094 | } | |
8095 | } | |
8096 | if (sectors && hi < bb->count) { | |
8097 | /* 'hi' points to the first range that starts after 's'. | |
8098 | * Maybe we can merge with the start of that range */ | |
8099 | sector_t a = BB_OFFSET(p[hi]); | |
8100 | sector_t e = a + BB_LEN(p[hi]); | |
8101 | int ack = BB_ACK(p[hi]); | |
8102 | if (a <= s + sectors) { | |
8103 | /* merging is possible */ | |
8104 | if (e <= s + sectors) { | |
8105 | /* full overlap */ | |
8106 | e = s + sectors; | |
8107 | ack = acknowledged; | |
8108 | } else | |
8109 | ack = ack && acknowledged; | |
8110 | ||
8111 | a = s; | |
8112 | if (e - a <= BB_MAX_LEN) { | |
8113 | p[hi] = BB_MAKE(a, e-a, ack); | |
8114 | s = e; | |
8115 | } else { | |
8116 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8117 | s = a + BB_MAX_LEN; | |
8118 | } | |
8119 | sectors = e - s; | |
8120 | lo = hi; | |
8121 | hi++; | |
8122 | } | |
8123 | } | |
8124 | if (sectors == 0 && hi < bb->count) { | |
8125 | /* we might be able to combine lo and hi */ | |
8126 | /* Note: 's' is at the end of 'lo' */ | |
8127 | sector_t a = BB_OFFSET(p[hi]); | |
8128 | int lolen = BB_LEN(p[lo]); | |
8129 | int hilen = BB_LEN(p[hi]); | |
8130 | int newlen = lolen + hilen - (s - a); | |
8131 | if (s >= a && newlen < BB_MAX_LEN) { | |
8132 | /* yes, we can combine them */ | |
8133 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8134 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8135 | memmove(p + hi, p + hi + 1, | |
8136 | (bb->count - hi - 1) * 8); | |
8137 | bb->count--; | |
8138 | } | |
8139 | } | |
8140 | while (sectors) { | |
8141 | /* didn't merge (it all). | |
8142 | * Need to add a range just before 'hi' */ | |
8143 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8144 | /* No room for more */ | |
8145 | rv = 0; | |
8146 | break; | |
8147 | } else { | |
8148 | int this_sectors = sectors; | |
8149 | memmove(p + hi + 1, p + hi, | |
8150 | (bb->count - hi) * 8); | |
8151 | bb->count++; | |
8152 | ||
8153 | if (this_sectors > BB_MAX_LEN) | |
8154 | this_sectors = BB_MAX_LEN; | |
8155 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8156 | sectors -= this_sectors; | |
8157 | s += this_sectors; | |
8158 | } | |
8159 | } | |
8160 | ||
8161 | bb->changed = 1; | |
de393cde N |
8162 | if (!acknowledged) |
8163 | bb->unacked_exist = 1; | |
905b0297 | 8164 | write_sequnlock_irqrestore(&bb->lock, flags); |
2230dfe4 N |
8165 | |
8166 | return rv; | |
8167 | } | |
8168 | ||
3cb03002 | 8169 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8170 | int is_new) |
2230dfe4 | 8171 | { |
c6563a8c N |
8172 | int rv; |
8173 | if (is_new) | |
8174 | s += rdev->new_data_offset; | |
8175 | else | |
8176 | s += rdev->data_offset; | |
8177 | rv = md_set_badblocks(&rdev->badblocks, | |
8178 | s, sectors, 0); | |
2230dfe4 N |
8179 | if (rv) { |
8180 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8181 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 N |
8182 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
8183 | md_wakeup_thread(rdev->mddev->thread); | |
8184 | } | |
8185 | return rv; | |
8186 | } | |
8187 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8188 | ||
8189 | /* | |
8190 | * Remove a range of bad blocks from the table. | |
8191 | * This may involve extending the table if we spilt a region, | |
8192 | * but it must not fail. So if the table becomes full, we just | |
8193 | * drop the remove request. | |
8194 | */ | |
8195 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8196 | { | |
8197 | u64 *p; | |
8198 | int lo, hi; | |
8199 | sector_t target = s + sectors; | |
8200 | int rv = 0; | |
8201 | ||
8202 | if (bb->shift > 0) { | |
8203 | /* When clearing we round the start up and the end down. | |
8204 | * This should not matter as the shift should align with | |
8205 | * the block size and no rounding should ever be needed. | |
8206 | * However it is better the think a block is bad when it | |
8207 | * isn't than to think a block is not bad when it is. | |
8208 | */ | |
8209 | s += (1<<bb->shift) - 1; | |
8210 | s >>= bb->shift; | |
8211 | target >>= bb->shift; | |
8212 | sectors = target - s; | |
8213 | } | |
8214 | ||
8215 | write_seqlock_irq(&bb->lock); | |
8216 | ||
8217 | p = bb->page; | |
8218 | lo = 0; | |
8219 | hi = bb->count; | |
8220 | /* Find the last range that starts before 'target' */ | |
8221 | while (hi - lo > 1) { | |
8222 | int mid = (lo + hi) / 2; | |
8223 | sector_t a = BB_OFFSET(p[mid]); | |
8224 | if (a < target) | |
8225 | lo = mid; | |
8226 | else | |
8227 | hi = mid; | |
8228 | } | |
8229 | if (hi > lo) { | |
8230 | /* p[lo] is the last range that could overlap the | |
8231 | * current range. Earlier ranges could also overlap, | |
8232 | * but only this one can overlap the end of the range. | |
8233 | */ | |
8234 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8235 | /* Partial overlap, leave the tail of this range */ | |
8236 | int ack = BB_ACK(p[lo]); | |
8237 | sector_t a = BB_OFFSET(p[lo]); | |
8238 | sector_t end = a + BB_LEN(p[lo]); | |
8239 | ||
8240 | if (a < s) { | |
8241 | /* we need to split this range */ | |
8242 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8b32bf5e | 8243 | rv = -ENOSPC; |
2230dfe4 N |
8244 | goto out; |
8245 | } | |
8246 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8247 | bb->count++; | |
8248 | p[lo] = BB_MAKE(a, s-a, ack); | |
8249 | lo++; | |
8250 | } | |
8251 | p[lo] = BB_MAKE(target, end - target, ack); | |
8252 | /* there is no longer an overlap */ | |
8253 | hi = lo; | |
8254 | lo--; | |
8255 | } | |
8256 | while (lo >= 0 && | |
8257 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8258 | /* This range does overlap */ | |
8259 | if (BB_OFFSET(p[lo]) < s) { | |
8260 | /* Keep the early parts of this range. */ | |
8261 | int ack = BB_ACK(p[lo]); | |
8262 | sector_t start = BB_OFFSET(p[lo]); | |
8263 | p[lo] = BB_MAKE(start, s - start, ack); | |
8264 | /* now low doesn't overlap, so.. */ | |
8265 | break; | |
8266 | } | |
8267 | lo--; | |
8268 | } | |
8269 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8270 | * anything between needs to be discarded | |
8271 | */ | |
8272 | if (hi - lo > 1) { | |
8273 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8274 | bb->count -= (hi - lo - 1); | |
8275 | } | |
8276 | } | |
8277 | ||
8278 | bb->changed = 1; | |
8279 | out: | |
8280 | write_sequnlock_irq(&bb->lock); | |
8281 | return rv; | |
8282 | } | |
8283 | ||
c6563a8c N |
8284 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8285 | int is_new) | |
2230dfe4 | 8286 | { |
c6563a8c N |
8287 | if (is_new) |
8288 | s += rdev->new_data_offset; | |
8289 | else | |
8290 | s += rdev->data_offset; | |
2230dfe4 | 8291 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8292 | s, sectors); |
2230dfe4 N |
8293 | } |
8294 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8295 | ||
8296 | /* | |
8297 | * Acknowledge all bad blocks in a list. | |
8298 | * This only succeeds if ->changed is clear. It is used by | |
8299 | * in-kernel metadata updates | |
8300 | */ | |
8301 | void md_ack_all_badblocks(struct badblocks *bb) | |
8302 | { | |
8303 | if (bb->page == NULL || bb->changed) | |
8304 | /* no point even trying */ | |
8305 | return; | |
8306 | write_seqlock_irq(&bb->lock); | |
8307 | ||
ecb178bb | 8308 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8309 | u64 *p = bb->page; |
8310 | int i; | |
8311 | for (i = 0; i < bb->count ; i++) { | |
8312 | if (!BB_ACK(p[i])) { | |
8313 | sector_t start = BB_OFFSET(p[i]); | |
8314 | int len = BB_LEN(p[i]); | |
8315 | p[i] = BB_MAKE(start, len, 1); | |
8316 | } | |
8317 | } | |
de393cde | 8318 | bb->unacked_exist = 0; |
2230dfe4 N |
8319 | } |
8320 | write_sequnlock_irq(&bb->lock); | |
8321 | } | |
8322 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8323 | ||
16c791a5 N |
8324 | /* sysfs access to bad-blocks list. |
8325 | * We present two files. | |
8326 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8327 | * are recorded as bad. The list is truncated to fit within | |
8328 | * the one-page limit of sysfs. | |
8329 | * Writing "sector length" to this file adds an acknowledged | |
8330 | * bad block list. | |
8331 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8332 | * been acknowledged. Writing to this file adds bad blocks | |
8333 | * without acknowledging them. This is largely for testing. | |
8334 | */ | |
8335 | ||
8336 | static ssize_t | |
8337 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8338 | { | |
8339 | size_t len; | |
8340 | int i; | |
8341 | u64 *p = bb->page; | |
8342 | unsigned seq; | |
8343 | ||
8344 | if (bb->shift < 0) | |
8345 | return 0; | |
8346 | ||
8347 | retry: | |
8348 | seq = read_seqbegin(&bb->lock); | |
8349 | ||
8350 | len = 0; | |
8351 | i = 0; | |
8352 | ||
8353 | while (len < PAGE_SIZE && i < bb->count) { | |
8354 | sector_t s = BB_OFFSET(p[i]); | |
8355 | unsigned int length = BB_LEN(p[i]); | |
8356 | int ack = BB_ACK(p[i]); | |
8357 | i++; | |
8358 | ||
8359 | if (unack && ack) | |
8360 | continue; | |
8361 | ||
8362 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8363 | (unsigned long long)s << bb->shift, | |
8364 | length << bb->shift); | |
8365 | } | |
de393cde N |
8366 | if (unack && len == 0) |
8367 | bb->unacked_exist = 0; | |
16c791a5 N |
8368 | |
8369 | if (read_seqretry(&bb->lock, seq)) | |
8370 | goto retry; | |
8371 | ||
8372 | return len; | |
8373 | } | |
8374 | ||
8375 | #define DO_DEBUG 1 | |
8376 | ||
8377 | static ssize_t | |
8378 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8379 | { | |
8380 | unsigned long long sector; | |
8381 | int length; | |
8382 | char newline; | |
8383 | #ifdef DO_DEBUG | |
8384 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8385 | * Normally only a successful write may clear a badblock | |
8386 | */ | |
8387 | int clear = 0; | |
8388 | if (page[0] == '-') { | |
8389 | clear = 1; | |
8390 | page++; | |
8391 | } | |
8392 | #endif /* DO_DEBUG */ | |
8393 | ||
8394 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8395 | case 3: | |
8396 | if (newline != '\n') | |
8397 | return -EINVAL; | |
8398 | case 2: | |
8399 | if (length <= 0) | |
8400 | return -EINVAL; | |
8401 | break; | |
8402 | default: | |
8403 | return -EINVAL; | |
8404 | } | |
8405 | ||
8406 | #ifdef DO_DEBUG | |
8407 | if (clear) { | |
8408 | md_clear_badblocks(bb, sector, length); | |
8409 | return len; | |
8410 | } | |
8411 | #endif /* DO_DEBUG */ | |
8412 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8413 | return len; | |
8414 | else | |
8415 | return -ENOSPC; | |
8416 | } | |
8417 | ||
75c96f85 AB |
8418 | static int md_notify_reboot(struct notifier_block *this, |
8419 | unsigned long code, void *x) | |
1da177e4 LT |
8420 | { |
8421 | struct list_head *tmp; | |
fd01b88c | 8422 | struct mddev *mddev; |
2dba6a91 | 8423 | int need_delay = 0; |
1da177e4 | 8424 | |
c744a65c N |
8425 | for_each_mddev(mddev, tmp) { |
8426 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8427 | if (mddev->pers) |
8428 | __md_stop_writes(mddev); | |
0f62fb22 N |
8429 | if (mddev->persistent) |
8430 | mddev->safemode = 2; | |
c744a65c | 8431 | mddev_unlock(mddev); |
2dba6a91 | 8432 | } |
c744a65c | 8433 | need_delay = 1; |
1da177e4 | 8434 | } |
c744a65c N |
8435 | /* |
8436 | * certain more exotic SCSI devices are known to be | |
8437 | * volatile wrt too early system reboots. While the | |
8438 | * right place to handle this issue is the given | |
8439 | * driver, we do want to have a safe RAID driver ... | |
8440 | */ | |
8441 | if (need_delay) | |
8442 | mdelay(1000*1); | |
8443 | ||
1da177e4 LT |
8444 | return NOTIFY_DONE; |
8445 | } | |
8446 | ||
75c96f85 | 8447 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8448 | .notifier_call = md_notify_reboot, |
8449 | .next = NULL, | |
8450 | .priority = INT_MAX, /* before any real devices */ | |
8451 | }; | |
8452 | ||
8453 | static void md_geninit(void) | |
8454 | { | |
36a4e1fe | 8455 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8456 | |
c7705f34 | 8457 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8458 | } |
8459 | ||
75c96f85 | 8460 | static int __init md_init(void) |
1da177e4 | 8461 | { |
e804ac78 TH |
8462 | int ret = -ENOMEM; |
8463 | ||
ada609ee | 8464 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8465 | if (!md_wq) |
8466 | goto err_wq; | |
8467 | ||
8468 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8469 | if (!md_misc_wq) | |
8470 | goto err_misc_wq; | |
8471 | ||
8472 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8473 | goto err_md; | |
8474 | ||
8475 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8476 | goto err_mdp; | |
8477 | mdp_major = ret; | |
8478 | ||
af5628f0 | 8479 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
8480 | md_probe, NULL, NULL); |
8481 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8482 | md_probe, NULL, NULL); |
8483 | ||
1da177e4 | 8484 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8485 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8486 | |
8487 | md_geninit(); | |
d710e138 | 8488 | return 0; |
1da177e4 | 8489 | |
e804ac78 TH |
8490 | err_mdp: |
8491 | unregister_blkdev(MD_MAJOR, "md"); | |
8492 | err_md: | |
8493 | destroy_workqueue(md_misc_wq); | |
8494 | err_misc_wq: | |
8495 | destroy_workqueue(md_wq); | |
8496 | err_wq: | |
8497 | return ret; | |
8498 | } | |
1da177e4 LT |
8499 | |
8500 | #ifndef MODULE | |
8501 | ||
8502 | /* | |
8503 | * Searches all registered partitions for autorun RAID arrays | |
8504 | * at boot time. | |
8505 | */ | |
4d936ec1 ME |
8506 | |
8507 | static LIST_HEAD(all_detected_devices); | |
8508 | struct detected_devices_node { | |
8509 | struct list_head list; | |
8510 | dev_t dev; | |
8511 | }; | |
1da177e4 LT |
8512 | |
8513 | void md_autodetect_dev(dev_t dev) | |
8514 | { | |
4d936ec1 ME |
8515 | struct detected_devices_node *node_detected_dev; |
8516 | ||
8517 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8518 | if (node_detected_dev) { | |
8519 | node_detected_dev->dev = dev; | |
8520 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8521 | } else { | |
8522 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8523 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8524 | } | |
1da177e4 LT |
8525 | } |
8526 | ||
1da177e4 LT |
8527 | static void autostart_arrays(int part) |
8528 | { | |
3cb03002 | 8529 | struct md_rdev *rdev; |
4d936ec1 ME |
8530 | struct detected_devices_node *node_detected_dev; |
8531 | dev_t dev; | |
8532 | int i_scanned, i_passed; | |
1da177e4 | 8533 | |
4d936ec1 ME |
8534 | i_scanned = 0; |
8535 | i_passed = 0; | |
1da177e4 | 8536 | |
4d936ec1 | 8537 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8538 | |
4d936ec1 ME |
8539 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8540 | i_scanned++; | |
8541 | node_detected_dev = list_entry(all_detected_devices.next, | |
8542 | struct detected_devices_node, list); | |
8543 | list_del(&node_detected_dev->list); | |
8544 | dev = node_detected_dev->dev; | |
8545 | kfree(node_detected_dev); | |
df968c4e | 8546 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8547 | if (IS_ERR(rdev)) |
8548 | continue; | |
8549 | ||
403df478 | 8550 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 8551 | continue; |
403df478 | 8552 | |
d0fae18f | 8553 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8554 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8555 | i_passed++; |
1da177e4 | 8556 | } |
4d936ec1 ME |
8557 | |
8558 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8559 | i_scanned, i_passed); | |
1da177e4 LT |
8560 | |
8561 | autorun_devices(part); | |
8562 | } | |
8563 | ||
fdee8ae4 | 8564 | #endif /* !MODULE */ |
1da177e4 LT |
8565 | |
8566 | static __exit void md_exit(void) | |
8567 | { | |
fd01b88c | 8568 | struct mddev *mddev; |
1da177e4 | 8569 | struct list_head *tmp; |
e2f23b60 | 8570 | int delay = 1; |
8ab5e4c1 | 8571 | |
af5628f0 | 8572 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 8573 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8574 | |
3dbd8c2e | 8575 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8576 | unregister_blkdev(mdp_major, "mdp"); |
8577 | unregister_reboot_notifier(&md_notifier); | |
8578 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
8579 | |
8580 | /* We cannot unload the modules while some process is | |
8581 | * waiting for us in select() or poll() - wake them up | |
8582 | */ | |
8583 | md_unloading = 1; | |
8584 | while (waitqueue_active(&md_event_waiters)) { | |
8585 | /* not safe to leave yet */ | |
8586 | wake_up(&md_event_waiters); | |
8587 | msleep(delay); | |
8588 | delay += delay; | |
8589 | } | |
1da177e4 | 8590 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 8591 | |
29ac4aa3 | 8592 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8593 | export_array(mddev); |
d3374825 | 8594 | mddev->hold_active = 0; |
1da177e4 | 8595 | } |
e804ac78 TH |
8596 | destroy_workqueue(md_misc_wq); |
8597 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8598 | } |
8599 | ||
685784aa | 8600 | subsys_initcall(md_init); |
1da177e4 LT |
8601 | module_exit(md_exit) |
8602 | ||
f91de92e N |
8603 | static int get_ro(char *buffer, struct kernel_param *kp) |
8604 | { | |
8605 | return sprintf(buffer, "%d", start_readonly); | |
8606 | } | |
8607 | static int set_ro(const char *val, struct kernel_param *kp) | |
8608 | { | |
8609 | char *e; | |
8610 | int num = simple_strtoul(val, &e, 10); | |
8611 | if (*val && (*e == '\0' || *e == '\n')) { | |
8612 | start_readonly = num; | |
4dbcdc75 | 8613 | return 0; |
f91de92e N |
8614 | } |
8615 | return -EINVAL; | |
8616 | } | |
8617 | ||
80ca3a44 N |
8618 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8619 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 8620 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8621 | |
1da177e4 | 8622 | MODULE_LICENSE("GPL"); |
0efb9e61 | 8623 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8624 | MODULE_ALIAS("md"); |
72008652 | 8625 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |