Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
f72ffdd6 | 3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar |
1da177e4 LT |
4 | |
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
ff01bb48 | 39 | #include <linux/fs.h> |
d7603b7e | 40 | #include <linux/poll.h> |
16f17b39 | 41 | #include <linux/ctype.h> |
e7d2860b | 42 | #include <linux/string.h> |
fb4d8c76 N |
43 | #include <linux/hdreg.h> |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/random.h> | |
056075c7 | 46 | #include <linux/module.h> |
fb4d8c76 | 47 | #include <linux/reboot.h> |
32a7627c | 48 | #include <linux/file.h> |
aa98aa31 | 49 | #include <linux/compat.h> |
25570727 | 50 | #include <linux/delay.h> |
bff61975 N |
51 | #include <linux/raid/md_p.h> |
52 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
43b2e5d8 | 54 | #include "md.h" |
ef740c37 | 55 | #include "bitmap.h" |
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); | |
75 | ||
1e50915f RB |
76 | /* |
77 | * Default number of read corrections we'll attempt on an rdev | |
78 | * before ejecting it from the array. We divide the read error | |
79 | * count by 2 for every hour elapsed between read errors. | |
80 | */ | |
81 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
82 | /* |
83 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
84 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
85 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 86 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
87 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
88 | * speed limit - in case reconstruction slows down your system despite | |
89 | * idle IO detection. | |
90 | * | |
91 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 92 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
93 | */ |
94 | ||
95 | static int sysctl_speed_limit_min = 1000; | |
96 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 97 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
98 | { |
99 | return mddev->sync_speed_min ? | |
100 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
101 | } | |
102 | ||
fd01b88c | 103 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
104 | { |
105 | return mddev->sync_speed_max ? | |
106 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
107 | } | |
1da177e4 LT |
108 | |
109 | static struct ctl_table_header *raid_table_header; | |
110 | ||
82592c38 | 111 | static struct ctl_table raid_table[] = { |
1da177e4 | 112 | { |
1da177e4 LT |
113 | .procname = "speed_limit_min", |
114 | .data = &sysctl_speed_limit_min, | |
115 | .maxlen = sizeof(int), | |
80ca3a44 | 116 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 117 | .proc_handler = proc_dointvec, |
1da177e4 LT |
118 | }, |
119 | { | |
1da177e4 LT |
120 | .procname = "speed_limit_max", |
121 | .data = &sysctl_speed_limit_max, | |
122 | .maxlen = sizeof(int), | |
80ca3a44 | 123 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 124 | .proc_handler = proc_dointvec, |
1da177e4 | 125 | }, |
894d2491 | 126 | { } |
1da177e4 LT |
127 | }; |
128 | ||
82592c38 | 129 | static struct ctl_table raid_dir_table[] = { |
1da177e4 | 130 | { |
1da177e4 LT |
131 | .procname = "raid", |
132 | .maxlen = 0, | |
80ca3a44 | 133 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
134 | .child = raid_table, |
135 | }, | |
894d2491 | 136 | { } |
1da177e4 LT |
137 | }; |
138 | ||
82592c38 | 139 | static struct ctl_table raid_root_table[] = { |
1da177e4 | 140 | { |
1da177e4 LT |
141 | .procname = "dev", |
142 | .maxlen = 0, | |
143 | .mode = 0555, | |
144 | .child = raid_dir_table, | |
145 | }, | |
894d2491 | 146 | { } |
1da177e4 LT |
147 | }; |
148 | ||
83d5cde4 | 149 | static const struct block_device_operations md_fops; |
1da177e4 | 150 | |
f91de92e N |
151 | static int start_readonly; |
152 | ||
a167f663 N |
153 | /* bio_clone_mddev |
154 | * like bio_clone, but with a local bio set | |
155 | */ | |
156 | ||
a167f663 | 157 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 158 | struct mddev *mddev) |
a167f663 N |
159 | { |
160 | struct bio *b; | |
a167f663 N |
161 | |
162 | if (!mddev || !mddev->bio_set) | |
163 | return bio_alloc(gfp_mask, nr_iovecs); | |
164 | ||
395c72a7 | 165 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
166 | if (!b) |
167 | return NULL; | |
a167f663 N |
168 | return b; |
169 | } | |
170 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
171 | ||
172 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 173 | struct mddev *mddev) |
a167f663 | 174 | { |
a167f663 N |
175 | if (!mddev || !mddev->bio_set) |
176 | return bio_clone(bio, gfp_mask); | |
177 | ||
bf800ef1 | 178 | return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
a167f663 N |
179 | } |
180 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
181 | ||
d7603b7e N |
182 | /* |
183 | * We have a system wide 'event count' that is incremented | |
184 | * on any 'interesting' event, and readers of /proc/mdstat | |
185 | * can use 'poll' or 'select' to find out when the event | |
186 | * count increases. | |
187 | * | |
188 | * Events are: | |
189 | * start array, stop array, error, add device, remove device, | |
190 | * start build, activate spare | |
191 | */ | |
2989ddbd | 192 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 193 | static atomic_t md_event_count; |
fd01b88c | 194 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
195 | { |
196 | atomic_inc(&md_event_count); | |
197 | wake_up(&md_event_waiters); | |
198 | } | |
29269553 | 199 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 200 | |
c331eb04 N |
201 | /* Alternate version that can be called from interrupts |
202 | * when calling sysfs_notify isn't needed. | |
203 | */ | |
fd01b88c | 204 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
205 | { |
206 | atomic_inc(&md_event_count); | |
207 | wake_up(&md_event_waiters); | |
208 | } | |
209 | ||
1da177e4 LT |
210 | /* |
211 | * Enables to iterate over all existing md arrays | |
212 | * all_mddevs_lock protects this list. | |
213 | */ | |
214 | static LIST_HEAD(all_mddevs); | |
215 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
216 | ||
1da177e4 LT |
217 | /* |
218 | * iterates through all used mddevs in the system. | |
219 | * We take care to grab the all_mddevs_lock whenever navigating | |
220 | * the list, and to always hold a refcount when unlocked. | |
221 | * Any code which breaks out of this loop while own | |
222 | * a reference to the current mddev and must mddev_put it. | |
223 | */ | |
fd01b88c | 224 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 | 225 | \ |
f72ffdd6 | 226 | for (({ spin_lock(&all_mddevs_lock); \ |
fd01b88c N |
227 | _tmp = all_mddevs.next; \ |
228 | _mddev = NULL;}); \ | |
229 | ({ if (_tmp != &all_mddevs) \ | |
230 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 231 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
232 | if (_mddev) mddev_put(_mddev); \ |
233 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
234 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 235 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 236 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
237 | ) |
238 | ||
409c57f3 N |
239 | /* Rather than calling directly into the personality make_request function, |
240 | * IO requests come here first so that we can check if the device is | |
241 | * being suspended pending a reconfiguration. | |
242 | * We hold a refcount over the call to ->make_request. By the time that | |
243 | * call has finished, the bio has been linked into some internal structure | |
244 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
245 | */ | |
5a7bbad2 | 246 | static void md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 247 | { |
49077326 | 248 | const int rw = bio_data_dir(bio); |
fd01b88c | 249 | struct mddev *mddev = q->queuedata; |
e91ece55 | 250 | unsigned int sectors; |
49077326 | 251 | |
0ca69886 N |
252 | if (mddev == NULL || mddev->pers == NULL |
253 | || !mddev->ready) { | |
409c57f3 | 254 | bio_io_error(bio); |
5a7bbad2 | 255 | return; |
409c57f3 | 256 | } |
bbfa57c0 SR |
257 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
258 | bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS); | |
259 | return; | |
260 | } | |
0ca69886 | 261 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 262 | rcu_read_lock(); |
e9c7469b | 263 | if (mddev->suspended) { |
409c57f3 N |
264 | DEFINE_WAIT(__wait); |
265 | for (;;) { | |
266 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
267 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 268 | if (!mddev->suspended) |
409c57f3 N |
269 | break; |
270 | rcu_read_unlock(); | |
271 | schedule(); | |
272 | rcu_read_lock(); | |
273 | } | |
274 | finish_wait(&mddev->sb_wait, &__wait); | |
275 | } | |
276 | atomic_inc(&mddev->active_io); | |
277 | rcu_read_unlock(); | |
49077326 | 278 | |
e91ece55 CM |
279 | /* |
280 | * save the sectors now since our bio can | |
281 | * go away inside make_request | |
282 | */ | |
283 | sectors = bio_sectors(bio); | |
5a7bbad2 | 284 | mddev->pers->make_request(mddev, bio); |
49077326 | 285 | |
18c0b223 | 286 | generic_start_io_acct(rw, sectors, &mddev->gendisk->part0); |
49077326 | 287 | |
409c57f3 N |
288 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
289 | wake_up(&mddev->sb_wait); | |
409c57f3 N |
290 | } |
291 | ||
9e35b99c N |
292 | /* mddev_suspend makes sure no new requests are submitted |
293 | * to the device, and that any requests that have been submitted | |
294 | * are completely handled. | |
295 | * Once ->stop is called and completes, the module will be completely | |
296 | * unused. | |
297 | */ | |
fd01b88c | 298 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
299 | { |
300 | BUG_ON(mddev->suspended); | |
301 | mddev->suspended = 1; | |
302 | synchronize_rcu(); | |
303 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
304 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
305 | |
306 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 307 | } |
390ee602 | 308 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 309 | |
fd01b88c | 310 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
311 | { |
312 | mddev->suspended = 0; | |
313 | wake_up(&mddev->sb_wait); | |
314 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 315 | |
47525e59 | 316 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
317 | md_wakeup_thread(mddev->thread); |
318 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 319 | } |
390ee602 | 320 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 321 | |
fd01b88c | 322 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 | 323 | { |
5c675f83 N |
324 | struct md_personality *pers = mddev->pers; |
325 | int ret = 0; | |
326 | ||
327 | rcu_read_lock(); | |
328 | if (mddev->suspended) | |
329 | ret = 1; | |
330 | else if (pers && pers->congested) | |
331 | ret = pers->congested(mddev, bits); | |
332 | rcu_read_unlock(); | |
333 | return ret; | |
334 | } | |
335 | EXPORT_SYMBOL_GPL(mddev_congested); | |
336 | static int md_congested(void *data, int bits) | |
337 | { | |
338 | struct mddev *mddev = data; | |
339 | return mddev_congested(mddev, bits); | |
3fa841d7 | 340 | } |
3fa841d7 | 341 | |
64590f45 N |
342 | static int md_mergeable_bvec(struct request_queue *q, |
343 | struct bvec_merge_data *bvm, | |
344 | struct bio_vec *biovec) | |
345 | { | |
346 | struct mddev *mddev = q->queuedata; | |
347 | int ret; | |
348 | rcu_read_lock(); | |
349 | if (mddev->suspended) { | |
350 | /* Must always allow one vec */ | |
351 | if (bvm->bi_size == 0) | |
352 | ret = biovec->bv_len; | |
353 | else | |
354 | ret = 0; | |
355 | } else { | |
356 | struct md_personality *pers = mddev->pers; | |
357 | if (pers && pers->mergeable_bvec) | |
358 | ret = pers->mergeable_bvec(mddev, bvm, biovec); | |
359 | else | |
360 | ret = biovec->bv_len; | |
361 | } | |
362 | rcu_read_unlock(); | |
363 | return ret; | |
364 | } | |
a2826aa9 | 365 | /* |
e9c7469b | 366 | * Generic flush handling for md |
a2826aa9 N |
367 | */ |
368 | ||
e9c7469b | 369 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 | 370 | { |
3cb03002 | 371 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 372 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
373 | |
374 | rdev_dec_pending(rdev, mddev); | |
375 | ||
376 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 377 | /* The pre-request flush has finished */ |
e804ac78 | 378 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
379 | } |
380 | bio_put(bio); | |
381 | } | |
382 | ||
a7a07e69 N |
383 | static void md_submit_flush_data(struct work_struct *ws); |
384 | ||
a035fc3e | 385 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 386 | { |
fd01b88c | 387 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 388 | struct md_rdev *rdev; |
a2826aa9 | 389 | |
a7a07e69 N |
390 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
391 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 392 | rcu_read_lock(); |
dafb20fa | 393 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
394 | if (rdev->raid_disk >= 0 && |
395 | !test_bit(Faulty, &rdev->flags)) { | |
396 | /* Take two references, one is dropped | |
397 | * when request finishes, one after | |
398 | * we reclaim rcu_read_lock | |
399 | */ | |
400 | struct bio *bi; | |
401 | atomic_inc(&rdev->nr_pending); | |
402 | atomic_inc(&rdev->nr_pending); | |
403 | rcu_read_unlock(); | |
b5e1b8ce | 404 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 405 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
406 | bi->bi_private = rdev; |
407 | bi->bi_bdev = rdev->bdev; | |
408 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 409 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
410 | rcu_read_lock(); |
411 | rdev_dec_pending(rdev, mddev); | |
412 | } | |
413 | rcu_read_unlock(); | |
a7a07e69 N |
414 | if (atomic_dec_and_test(&mddev->flush_pending)) |
415 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
416 | } |
417 | ||
e9c7469b | 418 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 419 | { |
fd01b88c | 420 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 421 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 422 | |
4f024f37 | 423 | if (bio->bi_iter.bi_size == 0) |
a2826aa9 N |
424 | /* an empty barrier - all done */ |
425 | bio_endio(bio, 0); | |
426 | else { | |
e9c7469b | 427 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 428 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 429 | } |
2b74e12e N |
430 | |
431 | mddev->flush_bio = NULL; | |
432 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
433 | } |
434 | ||
fd01b88c | 435 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 | 436 | { |
85572d7c | 437 | spin_lock_irq(&mddev->lock); |
a2826aa9 | 438 | wait_event_lock_irq(mddev->sb_wait, |
e9c7469b | 439 | !mddev->flush_bio, |
85572d7c | 440 | mddev->lock); |
e9c7469b | 441 | mddev->flush_bio = bio; |
85572d7c | 442 | spin_unlock_irq(&mddev->lock); |
a2826aa9 | 443 | |
a035fc3e N |
444 | INIT_WORK(&mddev->flush_work, submit_flushes); |
445 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 446 | } |
e9c7469b | 447 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 448 | |
74018dc3 | 449 | void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
97658cdd | 450 | { |
9cbb1750 N |
451 | struct mddev *mddev = cb->data; |
452 | md_wakeup_thread(mddev->thread); | |
453 | kfree(cb); | |
97658cdd | 454 | } |
9cbb1750 | 455 | EXPORT_SYMBOL(md_unplug); |
2ac87401 | 456 | |
fd01b88c | 457 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
458 | { |
459 | atomic_inc(&mddev->active); | |
460 | return mddev; | |
461 | } | |
462 | ||
5fd3a17e | 463 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 464 | |
fd01b88c | 465 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 466 | { |
a167f663 N |
467 | struct bio_set *bs = NULL; |
468 | ||
1da177e4 LT |
469 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
470 | return; | |
d3374825 | 471 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
472 | mddev->ctime == 0 && !mddev->hold_active) { |
473 | /* Array is not configured at all, and not held active, | |
474 | * so destroy it */ | |
af8a2434 | 475 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
476 | bs = mddev->bio_set; |
477 | mddev->bio_set = NULL; | |
d3374825 | 478 | if (mddev->gendisk) { |
e804ac78 TH |
479 | /* We did a probe so need to clean up. Call |
480 | * queue_work inside the spinlock so that | |
481 | * flush_workqueue() after mddev_find will | |
482 | * succeed in waiting for the work to be done. | |
d3374825 N |
483 | */ |
484 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 485 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
486 | } else |
487 | kfree(mddev); | |
488 | } | |
489 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
490 | if (bs) |
491 | bioset_free(bs); | |
1da177e4 LT |
492 | } |
493 | ||
fd01b88c | 494 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
495 | { |
496 | mutex_init(&mddev->open_mutex); | |
497 | mutex_init(&mddev->reconfig_mutex); | |
498 | mutex_init(&mddev->bitmap_info.mutex); | |
499 | INIT_LIST_HEAD(&mddev->disks); | |
500 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
501 | init_timer(&mddev->safemode_timer); | |
502 | atomic_set(&mddev->active, 1); | |
503 | atomic_set(&mddev->openers, 0); | |
504 | atomic_set(&mddev->active_io, 0); | |
85572d7c | 505 | spin_lock_init(&mddev->lock); |
fafd7fb0 N |
506 | atomic_set(&mddev->flush_pending, 0); |
507 | init_waitqueue_head(&mddev->sb_wait); | |
508 | init_waitqueue_head(&mddev->recovery_wait); | |
509 | mddev->reshape_position = MaxSector; | |
2c810cdd | 510 | mddev->reshape_backwards = 0; |
c4a39551 | 511 | mddev->last_sync_action = "none"; |
fafd7fb0 N |
512 | mddev->resync_min = 0; |
513 | mddev->resync_max = MaxSector; | |
514 | mddev->level = LEVEL_NONE; | |
515 | } | |
390ee602 | 516 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 517 | |
f72ffdd6 | 518 | static struct mddev *mddev_find(dev_t unit) |
1da177e4 | 519 | { |
fd01b88c | 520 | struct mddev *mddev, *new = NULL; |
1da177e4 | 521 | |
8f5f02c4 N |
522 | if (unit && MAJOR(unit) != MD_MAJOR) |
523 | unit &= ~((1<<MdpMinorShift)-1); | |
524 | ||
1da177e4 LT |
525 | retry: |
526 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
527 | |
528 | if (unit) { | |
529 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
530 | if (mddev->unit == unit) { | |
531 | mddev_get(mddev); | |
532 | spin_unlock(&all_mddevs_lock); | |
533 | kfree(new); | |
534 | return mddev; | |
535 | } | |
536 | ||
537 | if (new) { | |
538 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 539 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
540 | new->hold_active = UNTIL_IOCTL; |
541 | return new; | |
1da177e4 | 542 | } |
efeb53c0 N |
543 | } else if (new) { |
544 | /* find an unused unit number */ | |
545 | static int next_minor = 512; | |
546 | int start = next_minor; | |
547 | int is_free = 0; | |
548 | int dev = 0; | |
549 | while (!is_free) { | |
550 | dev = MKDEV(MD_MAJOR, next_minor); | |
551 | next_minor++; | |
552 | if (next_minor > MINORMASK) | |
553 | next_minor = 0; | |
554 | if (next_minor == start) { | |
555 | /* Oh dear, all in use. */ | |
556 | spin_unlock(&all_mddevs_lock); | |
557 | kfree(new); | |
558 | return NULL; | |
559 | } | |
f72ffdd6 | 560 | |
efeb53c0 N |
561 | is_free = 1; |
562 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
563 | if (mddev->unit == dev) { | |
564 | is_free = 0; | |
565 | break; | |
566 | } | |
567 | } | |
568 | new->unit = dev; | |
569 | new->md_minor = MINOR(dev); | |
570 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
571 | list_add(&new->all_mddevs, &all_mddevs); |
572 | spin_unlock(&all_mddevs_lock); | |
573 | return new; | |
574 | } | |
575 | spin_unlock(&all_mddevs_lock); | |
576 | ||
9ffae0cf | 577 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
578 | if (!new) |
579 | return NULL; | |
580 | ||
1da177e4 LT |
581 | new->unit = unit; |
582 | if (MAJOR(unit) == MD_MAJOR) | |
583 | new->md_minor = MINOR(unit); | |
584 | else | |
585 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
586 | ||
fafd7fb0 | 587 | mddev_init(new); |
1da177e4 | 588 | |
1da177e4 LT |
589 | goto retry; |
590 | } | |
591 | ||
f72ffdd6 | 592 | static inline int __must_check mddev_lock(struct mddev *mddev) |
1da177e4 | 593 | { |
df5b89b3 | 594 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
595 | } |
596 | ||
29f097c4 N |
597 | /* Sometimes we need to take the lock in a situation where |
598 | * failure due to interrupts is not acceptable. | |
599 | */ | |
f72ffdd6 | 600 | static inline void mddev_lock_nointr(struct mddev *mddev) |
29f097c4 N |
601 | { |
602 | mutex_lock(&mddev->reconfig_mutex); | |
603 | } | |
604 | ||
fd01b88c | 605 | static inline int mddev_is_locked(struct mddev *mddev) |
b522adcd DW |
606 | { |
607 | return mutex_is_locked(&mddev->reconfig_mutex); | |
608 | } | |
609 | ||
f72ffdd6 | 610 | static inline int mddev_trylock(struct mddev *mddev) |
1da177e4 | 611 | { |
df5b89b3 | 612 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
613 | } |
614 | ||
b6eb127d N |
615 | static struct attribute_group md_redundancy_group; |
616 | ||
f72ffdd6 | 617 | static void mddev_unlock(struct mddev *mddev) |
1da177e4 | 618 | { |
a64c876f | 619 | if (mddev->to_remove) { |
b6eb127d N |
620 | /* These cannot be removed under reconfig_mutex as |
621 | * an access to the files will try to take reconfig_mutex | |
622 | * while holding the file unremovable, which leads to | |
623 | * a deadlock. | |
bb4f1e9d N |
624 | * So hold set sysfs_active while the remove in happeing, |
625 | * and anything else which might set ->to_remove or my | |
626 | * otherwise change the sysfs namespace will fail with | |
627 | * -EBUSY if sysfs_active is still set. | |
628 | * We set sysfs_active under reconfig_mutex and elsewhere | |
629 | * test it under the same mutex to ensure its correct value | |
630 | * is seen. | |
b6eb127d | 631 | */ |
a64c876f N |
632 | struct attribute_group *to_remove = mddev->to_remove; |
633 | mddev->to_remove = NULL; | |
bb4f1e9d | 634 | mddev->sysfs_active = 1; |
b6eb127d N |
635 | mutex_unlock(&mddev->reconfig_mutex); |
636 | ||
00bcb4ac N |
637 | if (mddev->kobj.sd) { |
638 | if (to_remove != &md_redundancy_group) | |
639 | sysfs_remove_group(&mddev->kobj, to_remove); | |
640 | if (mddev->pers == NULL || | |
641 | mddev->pers->sync_request == NULL) { | |
642 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
643 | if (mddev->sysfs_action) | |
644 | sysfs_put(mddev->sysfs_action); | |
645 | mddev->sysfs_action = NULL; | |
646 | } | |
a64c876f | 647 | } |
bb4f1e9d | 648 | mddev->sysfs_active = 0; |
b6eb127d N |
649 | } else |
650 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 651 | |
751e67ca CD |
652 | /* As we've dropped the mutex we need a spinlock to |
653 | * make sure the thread doesn't disappear | |
01f96c0a N |
654 | */ |
655 | spin_lock(&pers_lock); | |
005eca5e | 656 | md_wakeup_thread(mddev->thread); |
01f96c0a | 657 | spin_unlock(&pers_lock); |
1da177e4 LT |
658 | } |
659 | ||
1ca69c4b N |
660 | static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr) |
661 | { | |
662 | struct md_rdev *rdev; | |
663 | ||
664 | rdev_for_each_rcu(rdev, mddev) | |
665 | if (rdev->desc_nr == nr) | |
666 | return rdev; | |
667 | ||
668 | return NULL; | |
669 | } | |
670 | ||
671 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 672 | { |
3cb03002 | 673 | struct md_rdev *rdev; |
1da177e4 | 674 | |
dafb20fa | 675 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
676 | if (rdev->bdev->bd_dev == dev) |
677 | return rdev; | |
159ec1fc | 678 | |
1da177e4 LT |
679 | return NULL; |
680 | } | |
681 | ||
1ca69c4b N |
682 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
683 | { | |
684 | struct md_rdev *rdev; | |
685 | ||
686 | rdev_for_each_rcu(rdev, mddev) | |
687 | if (rdev->bdev->bd_dev == dev) | |
688 | return rdev; | |
689 | ||
690 | return NULL; | |
691 | } | |
692 | ||
84fc4b56 | 693 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 694 | { |
84fc4b56 | 695 | struct md_personality *pers; |
d9d166c2 N |
696 | list_for_each_entry(pers, &pers_list, list) { |
697 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 698 | return pers; |
d9d166c2 N |
699 | if (strcmp(pers->name, clevel)==0) |
700 | return pers; | |
701 | } | |
2604b703 N |
702 | return NULL; |
703 | } | |
704 | ||
b73df2d3 | 705 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 706 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 707 | { |
57b2caa3 | 708 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 709 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
710 | } |
711 | ||
f72ffdd6 | 712 | static int alloc_disk_sb(struct md_rdev *rdev) |
1da177e4 | 713 | { |
1da177e4 LT |
714 | rdev->sb_page = alloc_page(GFP_KERNEL); |
715 | if (!rdev->sb_page) { | |
716 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 717 | return -ENOMEM; |
1da177e4 LT |
718 | } |
719 | ||
720 | return 0; | |
721 | } | |
722 | ||
545c8795 | 723 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
724 | { |
725 | if (rdev->sb_page) { | |
2d1f3b5d | 726 | put_page(rdev->sb_page); |
1da177e4 LT |
727 | rdev->sb_loaded = 0; |
728 | rdev->sb_page = NULL; | |
0f420358 | 729 | rdev->sb_start = 0; |
dd8ac336 | 730 | rdev->sectors = 0; |
1da177e4 | 731 | } |
2699b672 N |
732 | if (rdev->bb_page) { |
733 | put_page(rdev->bb_page); | |
734 | rdev->bb_page = NULL; | |
735 | } | |
4fa2f327 N |
736 | kfree(rdev->badblocks.page); |
737 | rdev->badblocks.page = NULL; | |
1da177e4 | 738 | } |
545c8795 | 739 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 740 | |
6712ecf8 | 741 | static void super_written(struct bio *bio, int error) |
7bfa19f2 | 742 | { |
3cb03002 | 743 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 744 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 745 | |
3a0f5bbb N |
746 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
747 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
748 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
749 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 750 | md_error(mddev, rdev); |
3a0f5bbb | 751 | } |
7bfa19f2 | 752 | |
a9701a30 N |
753 | if (atomic_dec_and_test(&mddev->pending_writes)) |
754 | wake_up(&mddev->sb_wait); | |
f8b58edf | 755 | bio_put(bio); |
7bfa19f2 N |
756 | } |
757 | ||
fd01b88c | 758 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
759 | sector_t sector, int size, struct page *page) |
760 | { | |
761 | /* write first size bytes of page to sector of rdev | |
762 | * Increment mddev->pending_writes before returning | |
763 | * and decrement it on completion, waking up sb_wait | |
764 | * if zero is reached. | |
765 | * If an error occurred, call md_error | |
766 | */ | |
a167f663 | 767 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 768 | |
a6ff7e08 | 769 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
4f024f37 | 770 | bio->bi_iter.bi_sector = sector; |
7bfa19f2 N |
771 | bio_add_page(bio, page, size, 0); |
772 | bio->bi_private = rdev; | |
773 | bio->bi_end_io = super_written; | |
a9701a30 | 774 | |
7bfa19f2 | 775 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 776 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
777 | } |
778 | ||
fd01b88c | 779 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 780 | { |
e9c7469b | 781 | /* wait for all superblock writes that were scheduled to complete */ |
1967cd56 | 782 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
7bfa19f2 N |
783 | } |
784 | ||
3cb03002 | 785 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 786 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 787 | { |
a167f663 | 788 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
789 | int ret; |
790 | ||
a6ff7e08 JB |
791 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
792 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 | 793 | if (metadata_op) |
4f024f37 | 794 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
1fdd6fc9 N |
795 | else if (rdev->mddev->reshape_position != MaxSector && |
796 | (rdev->mddev->reshape_backwards == | |
797 | (sector >= rdev->mddev->reshape_position))) | |
4f024f37 | 798 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
ccebd4c4 | 799 | else |
4f024f37 | 800 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
1da177e4 | 801 | bio_add_page(bio, page, size, 0); |
c170bbb4 | 802 | submit_bio_wait(rw, bio); |
1da177e4 LT |
803 | |
804 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
805 | bio_put(bio); | |
806 | return ret; | |
807 | } | |
a8745db2 | 808 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 809 | |
f72ffdd6 | 810 | static int read_disk_sb(struct md_rdev *rdev, int size) |
1da177e4 LT |
811 | { |
812 | char b[BDEVNAME_SIZE]; | |
403df478 | 813 | |
1da177e4 LT |
814 | if (rdev->sb_loaded) |
815 | return 0; | |
816 | ||
ccebd4c4 | 817 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
818 | goto fail; |
819 | rdev->sb_loaded = 1; | |
820 | return 0; | |
821 | ||
822 | fail: | |
823 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
824 | bdevname(rdev->bdev,b)); | |
825 | return -EINVAL; | |
826 | } | |
827 | ||
828 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
829 | { | |
f72ffdd6 | 830 | return sb1->set_uuid0 == sb2->set_uuid0 && |
05710466 AN |
831 | sb1->set_uuid1 == sb2->set_uuid1 && |
832 | sb1->set_uuid2 == sb2->set_uuid2 && | |
833 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
834 | } |
835 | ||
1da177e4 LT |
836 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
837 | { | |
838 | int ret; | |
839 | mdp_super_t *tmp1, *tmp2; | |
840 | ||
841 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
842 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
843 | ||
844 | if (!tmp1 || !tmp2) { | |
845 | ret = 0; | |
35020f1a | 846 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
847 | goto abort; |
848 | } | |
849 | ||
850 | *tmp1 = *sb1; | |
851 | *tmp2 = *sb2; | |
852 | ||
853 | /* | |
854 | * nr_disks is not constant | |
855 | */ | |
856 | tmp1->nr_disks = 0; | |
857 | tmp2->nr_disks = 0; | |
858 | ||
ce0c8e05 | 859 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 860 | abort: |
990a8baf JJ |
861 | kfree(tmp1); |
862 | kfree(tmp2); | |
1da177e4 LT |
863 | return ret; |
864 | } | |
865 | ||
4d167f09 N |
866 | static u32 md_csum_fold(u32 csum) |
867 | { | |
868 | csum = (csum & 0xffff) + (csum >> 16); | |
869 | return (csum & 0xffff) + (csum >> 16); | |
870 | } | |
871 | ||
f72ffdd6 | 872 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
1da177e4 | 873 | { |
4d167f09 N |
874 | u64 newcsum = 0; |
875 | u32 *sb32 = (u32*)sb; | |
876 | int i; | |
1da177e4 LT |
877 | unsigned int disk_csum, csum; |
878 | ||
879 | disk_csum = sb->sb_csum; | |
880 | sb->sb_csum = 0; | |
4d167f09 N |
881 | |
882 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
883 | newcsum += sb32[i]; | |
884 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
885 | ||
4d167f09 N |
886 | #ifdef CONFIG_ALPHA |
887 | /* This used to use csum_partial, which was wrong for several | |
888 | * reasons including that different results are returned on | |
889 | * different architectures. It isn't critical that we get exactly | |
890 | * the same return value as before (we always csum_fold before | |
891 | * testing, and that removes any differences). However as we | |
892 | * know that csum_partial always returned a 16bit value on | |
893 | * alphas, do a fold to maximise conformity to previous behaviour. | |
894 | */ | |
895 | sb->sb_csum = md_csum_fold(disk_csum); | |
896 | #else | |
1da177e4 | 897 | sb->sb_csum = disk_csum; |
4d167f09 | 898 | #endif |
1da177e4 LT |
899 | return csum; |
900 | } | |
901 | ||
1da177e4 LT |
902 | /* |
903 | * Handle superblock details. | |
904 | * We want to be able to handle multiple superblock formats | |
905 | * so we have a common interface to them all, and an array of | |
906 | * different handlers. | |
907 | * We rely on user-space to write the initial superblock, and support | |
908 | * reading and updating of superblocks. | |
909 | * Interface methods are: | |
3cb03002 | 910 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
911 | * loads and validates a superblock on dev. |
912 | * if refdev != NULL, compare superblocks on both devices | |
913 | * Return: | |
914 | * 0 - dev has a superblock that is compatible with refdev | |
915 | * 1 - dev has a superblock that is compatible and newer than refdev | |
916 | * so dev should be used as the refdev in future | |
917 | * -EINVAL superblock incompatible or invalid | |
918 | * -othererror e.g. -EIO | |
919 | * | |
fd01b88c | 920 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
921 | * Verify that dev is acceptable into mddev. |
922 | * The first time, mddev->raid_disks will be 0, and data from | |
923 | * dev should be merged in. Subsequent calls check that dev | |
924 | * is new enough. Return 0 or -EINVAL | |
925 | * | |
fd01b88c | 926 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
927 | * Update the superblock for rdev with data in mddev |
928 | * This does not write to disc. | |
929 | * | |
930 | */ | |
931 | ||
932 | struct super_type { | |
0cd17fec CW |
933 | char *name; |
934 | struct module *owner; | |
c6563a8c N |
935 | int (*load_super)(struct md_rdev *rdev, |
936 | struct md_rdev *refdev, | |
0cd17fec | 937 | int minor_version); |
c6563a8c N |
938 | int (*validate_super)(struct mddev *mddev, |
939 | struct md_rdev *rdev); | |
940 | void (*sync_super)(struct mddev *mddev, | |
941 | struct md_rdev *rdev); | |
3cb03002 | 942 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 943 | sector_t num_sectors); |
c6563a8c N |
944 | int (*allow_new_offset)(struct md_rdev *rdev, |
945 | unsigned long long new_offset); | |
1da177e4 LT |
946 | }; |
947 | ||
0894cc30 AN |
948 | /* |
949 | * Check that the given mddev has no bitmap. | |
950 | * | |
951 | * This function is called from the run method of all personalities that do not | |
952 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
953 | * has a bitmap. Otherwise, it returns 0. | |
954 | * | |
955 | */ | |
fd01b88c | 956 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 957 | { |
c3d9714e | 958 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
959 | return 0; |
960 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
961 | mdname(mddev), mddev->pers->name); | |
962 | return 1; | |
963 | } | |
964 | EXPORT_SYMBOL(md_check_no_bitmap); | |
965 | ||
1da177e4 | 966 | /* |
f72ffdd6 | 967 | * load_super for 0.90.0 |
1da177e4 | 968 | */ |
3cb03002 | 969 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
970 | { |
971 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
972 | mdp_super_t *sb; | |
973 | int ret; | |
1da177e4 LT |
974 | |
975 | /* | |
0f420358 | 976 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
977 | * it's at the end of the disk. |
978 | * | |
979 | * It also happens to be a multiple of 4Kb. | |
980 | */ | |
57b2caa3 | 981 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 982 | |
0002b271 | 983 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
984 | if (ret) return ret; |
985 | ||
986 | ret = -EINVAL; | |
987 | ||
988 | bdevname(rdev->bdev, b); | |
65a06f06 | 989 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
990 | |
991 | if (sb->md_magic != MD_SB_MAGIC) { | |
992 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
993 | b); | |
994 | goto abort; | |
995 | } | |
996 | ||
997 | if (sb->major_version != 0 || | |
f6705578 N |
998 | sb->minor_version < 90 || |
999 | sb->minor_version > 91) { | |
1da177e4 LT |
1000 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1001 | sb->major_version, sb->minor_version, | |
1002 | b); | |
1003 | goto abort; | |
1004 | } | |
1005 | ||
1006 | if (sb->raid_disks <= 0) | |
1007 | goto abort; | |
1008 | ||
4d167f09 | 1009 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1010 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1011 | b); | |
1012 | goto abort; | |
1013 | } | |
1014 | ||
1015 | rdev->preferred_minor = sb->md_minor; | |
1016 | rdev->data_offset = 0; | |
c6563a8c | 1017 | rdev->new_data_offset = 0; |
0002b271 | 1018 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1019 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1020 | |
1021 | if (sb->level == LEVEL_MULTIPATH) | |
1022 | rdev->desc_nr = -1; | |
1023 | else | |
1024 | rdev->desc_nr = sb->this_disk.number; | |
1025 | ||
9a7b2b0f | 1026 | if (!refdev) { |
1da177e4 | 1027 | ret = 1; |
9a7b2b0f | 1028 | } else { |
1da177e4 | 1029 | __u64 ev1, ev2; |
65a06f06 | 1030 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1031 | if (!uuid_equal(refsb, sb)) { |
1032 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1033 | b, bdevname(refdev->bdev,b2)); | |
1034 | goto abort; | |
1035 | } | |
1036 | if (!sb_equal(refsb, sb)) { | |
1037 | printk(KERN_WARNING "md: %s has same UUID" | |
1038 | " but different superblock to %s\n", | |
1039 | b, bdevname(refdev->bdev, b2)); | |
1040 | goto abort; | |
1041 | } | |
1042 | ev1 = md_event(sb); | |
1043 | ev2 = md_event(refsb); | |
1044 | if (ev1 > ev2) | |
1045 | ret = 1; | |
f72ffdd6 | 1046 | else |
1da177e4 LT |
1047 | ret = 0; |
1048 | } | |
8190e754 | 1049 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1050 | /* Limit to 4TB as metadata cannot record more than that. |
1051 | * (not needed for Linear and RAID0 as metadata doesn't | |
1052 | * record this size) | |
1053 | */ | |
1054 | if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) | |
27a7b260 | 1055 | rdev->sectors = (2ULL << 32) - 2; |
1da177e4 | 1056 | |
27a7b260 | 1057 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1058 | /* "this cannot possibly happen" ... */ |
1059 | ret = -EINVAL; | |
1060 | ||
1da177e4 LT |
1061 | abort: |
1062 | return ret; | |
1063 | } | |
1064 | ||
1065 | /* | |
1066 | * validate_super for 0.90.0 | |
1067 | */ | |
fd01b88c | 1068 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1069 | { |
1070 | mdp_disk_t *desc; | |
65a06f06 | 1071 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1072 | __u64 ev1 = md_event(sb); |
1da177e4 | 1073 | |
41158c7e | 1074 | rdev->raid_disk = -1; |
c5d79adb N |
1075 | clear_bit(Faulty, &rdev->flags); |
1076 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1077 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1078 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1079 | |
1da177e4 LT |
1080 | if (mddev->raid_disks == 0) { |
1081 | mddev->major_version = 0; | |
1082 | mddev->minor_version = sb->minor_version; | |
1083 | mddev->patch_version = sb->patch_version; | |
e691063a | 1084 | mddev->external = 0; |
9d8f0363 | 1085 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1086 | mddev->ctime = sb->ctime; |
1087 | mddev->utime = sb->utime; | |
1088 | mddev->level = sb->level; | |
d9d166c2 | 1089 | mddev->clevel[0] = 0; |
1da177e4 LT |
1090 | mddev->layout = sb->layout; |
1091 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1092 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1093 | mddev->events = ev1; |
c3d9714e | 1094 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1095 | mddev->bitmap_info.space = 0; |
1096 | /* bitmap can use 60 K after the 4K superblocks */ | |
c3d9714e | 1097 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 1098 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
2c810cdd | 1099 | mddev->reshape_backwards = 0; |
1da177e4 | 1100 | |
f6705578 N |
1101 | if (mddev->minor_version >= 91) { |
1102 | mddev->reshape_position = sb->reshape_position; | |
1103 | mddev->delta_disks = sb->delta_disks; | |
1104 | mddev->new_level = sb->new_level; | |
1105 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1106 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1107 | if (mddev->delta_disks < 0) |
1108 | mddev->reshape_backwards = 1; | |
f6705578 N |
1109 | } else { |
1110 | mddev->reshape_position = MaxSector; | |
1111 | mddev->delta_disks = 0; | |
1112 | mddev->new_level = mddev->level; | |
1113 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1114 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1115 | } |
1116 | ||
1da177e4 LT |
1117 | if (sb->state & (1<<MD_SB_CLEAN)) |
1118 | mddev->recovery_cp = MaxSector; | |
1119 | else { | |
f72ffdd6 | 1120 | if (sb->events_hi == sb->cp_events_hi && |
1da177e4 LT |
1121 | sb->events_lo == sb->cp_events_lo) { |
1122 | mddev->recovery_cp = sb->recovery_cp; | |
1123 | } else | |
1124 | mddev->recovery_cp = 0; | |
1125 | } | |
1126 | ||
1127 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1128 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1129 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1130 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1131 | ||
1132 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1133 | |
1134 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
6409bb05 | 1135 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1136 | mddev->bitmap_info.offset = |
1137 | mddev->bitmap_info.default_offset; | |
6409bb05 | 1138 | mddev->bitmap_info.space = |
c9ad020f | 1139 | mddev->bitmap_info.default_space; |
6409bb05 | 1140 | } |
a654b9d8 | 1141 | |
41158c7e | 1142 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1143 | /* Insist on good event counter while assembling, except |
1144 | * for spares (which don't need an event count) */ | |
1da177e4 | 1145 | ++ev1; |
be6800a7 N |
1146 | if (sb->disks[rdev->desc_nr].state & ( |
1147 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
f72ffdd6 | 1148 | if (ev1 < mddev->events) |
be6800a7 | 1149 | return -EINVAL; |
41158c7e N |
1150 | } else if (mddev->bitmap) { |
1151 | /* if adding to array with a bitmap, then we can accept an | |
1152 | * older device ... but not too old. | |
1153 | */ | |
41158c7e N |
1154 | if (ev1 < mddev->bitmap->events_cleared) |
1155 | return 0; | |
8313b8e5 N |
1156 | if (ev1 < mddev->events) |
1157 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1158 | } else { |
1159 | if (ev1 < mddev->events) | |
1160 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1161 | return 0; | |
1162 | } | |
41158c7e | 1163 | |
1da177e4 | 1164 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1165 | desc = sb->disks + rdev->desc_nr; |
1166 | ||
1167 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1168 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1169 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1170 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1171 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1172 | rdev->raid_disk = desc->raid_disk; |
f466722c | 1173 | rdev->saved_raid_disk = desc->raid_disk; |
0261cd9f N |
1174 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1175 | /* active but not in sync implies recovery up to | |
1176 | * reshape position. We don't know exactly where | |
1177 | * that is, so set to zero for now */ | |
1178 | if (mddev->minor_version >= 91) { | |
1179 | rdev->recovery_offset = 0; | |
1180 | rdev->raid_disk = desc->raid_disk; | |
1181 | } | |
1da177e4 | 1182 | } |
8ddf9efe N |
1183 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1184 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1185 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1186 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1187 | return 0; |
1188 | } | |
1189 | ||
1190 | /* | |
1191 | * sync_super for 0.90.0 | |
1192 | */ | |
fd01b88c | 1193 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1194 | { |
1195 | mdp_super_t *sb; | |
3cb03002 | 1196 | struct md_rdev *rdev2; |
1da177e4 | 1197 | int next_spare = mddev->raid_disks; |
19133a42 | 1198 | |
1da177e4 LT |
1199 | /* make rdev->sb match mddev data.. |
1200 | * | |
1201 | * 1/ zero out disks | |
1202 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1203 | * 3/ any empty disks < next_spare become removed | |
1204 | * | |
1205 | * disks[0] gets initialised to REMOVED because | |
1206 | * we cannot be sure from other fields if it has | |
1207 | * been initialised or not. | |
1208 | */ | |
1209 | int i; | |
1210 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1211 | ||
61181565 N |
1212 | rdev->sb_size = MD_SB_BYTES; |
1213 | ||
65a06f06 | 1214 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1215 | |
1216 | memset(sb, 0, sizeof(*sb)); | |
1217 | ||
1218 | sb->md_magic = MD_SB_MAGIC; | |
1219 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1220 | sb->patch_version = mddev->patch_version; |
1221 | sb->gvalid_words = 0; /* ignored */ | |
1222 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1223 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1224 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1225 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1226 | ||
1227 | sb->ctime = mddev->ctime; | |
1228 | sb->level = mddev->level; | |
58c0fed4 | 1229 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1230 | sb->raid_disks = mddev->raid_disks; |
1231 | sb->md_minor = mddev->md_minor; | |
e691063a | 1232 | sb->not_persistent = 0; |
1da177e4 LT |
1233 | sb->utime = mddev->utime; |
1234 | sb->state = 0; | |
1235 | sb->events_hi = (mddev->events>>32); | |
1236 | sb->events_lo = (u32)mddev->events; | |
1237 | ||
f6705578 N |
1238 | if (mddev->reshape_position == MaxSector) |
1239 | sb->minor_version = 90; | |
1240 | else { | |
1241 | sb->minor_version = 91; | |
1242 | sb->reshape_position = mddev->reshape_position; | |
1243 | sb->new_level = mddev->new_level; | |
1244 | sb->delta_disks = mddev->delta_disks; | |
1245 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1246 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1247 | } |
1248 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1249 | if (mddev->in_sync) |
1250 | { | |
1251 | sb->recovery_cp = mddev->recovery_cp; | |
1252 | sb->cp_events_hi = (mddev->events>>32); | |
1253 | sb->cp_events_lo = (u32)mddev->events; | |
1254 | if (mddev->recovery_cp == MaxSector) | |
1255 | sb->state = (1<< MD_SB_CLEAN); | |
1256 | } else | |
1257 | sb->recovery_cp = 0; | |
1258 | ||
1259 | sb->layout = mddev->layout; | |
9d8f0363 | 1260 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1261 | |
c3d9714e | 1262 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1263 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1264 | ||
1da177e4 | 1265 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1266 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1267 | mdp_disk_t *d; |
86e6ffdd | 1268 | int desc_nr; |
0261cd9f N |
1269 | int is_active = test_bit(In_sync, &rdev2->flags); |
1270 | ||
1271 | if (rdev2->raid_disk >= 0 && | |
1272 | sb->minor_version >= 91) | |
1273 | /* we have nowhere to store the recovery_offset, | |
1274 | * but if it is not below the reshape_position, | |
1275 | * we can piggy-back on that. | |
1276 | */ | |
1277 | is_active = 1; | |
1278 | if (rdev2->raid_disk < 0 || | |
1279 | test_bit(Faulty, &rdev2->flags)) | |
1280 | is_active = 0; | |
1281 | if (is_active) | |
86e6ffdd | 1282 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1283 | else |
86e6ffdd | 1284 | desc_nr = next_spare++; |
19133a42 | 1285 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1286 | d = &sb->disks[rdev2->desc_nr]; |
1287 | nr_disks++; | |
1288 | d->number = rdev2->desc_nr; | |
1289 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1290 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1291 | if (is_active) |
1da177e4 LT |
1292 | d->raid_disk = rdev2->raid_disk; |
1293 | else | |
1294 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1295 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1296 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1297 | else if (is_active) { |
1da177e4 | 1298 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1299 | if (test_bit(In_sync, &rdev2->flags)) |
1300 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1301 | active++; |
1302 | working++; | |
1303 | } else { | |
1304 | d->state = 0; | |
1305 | spare++; | |
1306 | working++; | |
1307 | } | |
8ddf9efe N |
1308 | if (test_bit(WriteMostly, &rdev2->flags)) |
1309 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1310 | } |
1da177e4 LT |
1311 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1312 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1313 | mdp_disk_t *d = &sb->disks[i]; | |
1314 | if (d->state == 0 && d->number == 0) { | |
1315 | d->number = i; | |
1316 | d->raid_disk = i; | |
1317 | d->state = (1<<MD_DISK_REMOVED); | |
1318 | d->state |= (1<<MD_DISK_FAULTY); | |
1319 | failed++; | |
1320 | } | |
1321 | } | |
1322 | sb->nr_disks = nr_disks; | |
1323 | sb->active_disks = active; | |
1324 | sb->working_disks = working; | |
1325 | sb->failed_disks = failed; | |
1326 | sb->spare_disks = spare; | |
1327 | ||
1328 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1329 | sb->sb_csum = calc_sb_csum(sb); | |
1330 | } | |
1331 | ||
0cd17fec CW |
1332 | /* |
1333 | * rdev_size_change for 0.90.0 | |
1334 | */ | |
1335 | static unsigned long long | |
3cb03002 | 1336 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1337 | { |
58c0fed4 | 1338 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1339 | return 0; /* component must fit device */ |
c3d9714e | 1340 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1341 | return 0; /* can't move bitmap */ |
57b2caa3 | 1342 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1343 | if (!num_sectors || num_sectors > rdev->sb_start) |
1344 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1345 | /* Limit to 4TB as metadata cannot record more than that. |
1346 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1347 | */ | |
667a5313 | 1348 | if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) |
27a7b260 | 1349 | num_sectors = (2ULL << 32) - 2; |
0f420358 | 1350 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1351 | rdev->sb_page); |
1352 | md_super_wait(rdev->mddev); | |
c26a44ed | 1353 | return num_sectors; |
0cd17fec CW |
1354 | } |
1355 | ||
c6563a8c N |
1356 | static int |
1357 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1358 | { | |
1359 | /* non-zero offset changes not possible with v0.90 */ | |
1360 | return new_offset == 0; | |
1361 | } | |
0cd17fec | 1362 | |
1da177e4 LT |
1363 | /* |
1364 | * version 1 superblock | |
1365 | */ | |
1366 | ||
f72ffdd6 | 1367 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
1da177e4 | 1368 | { |
1c05b4bc N |
1369 | __le32 disk_csum; |
1370 | u32 csum; | |
1da177e4 LT |
1371 | unsigned long long newcsum; |
1372 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1373 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1374 | |
1375 | disk_csum = sb->sb_csum; | |
1376 | sb->sb_csum = 0; | |
1377 | newcsum = 0; | |
1f3c9907 | 1378 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1379 | newcsum += le32_to_cpu(*isuper++); |
1380 | ||
1381 | if (size == 2) | |
1c05b4bc | 1382 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1383 | |
1384 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1385 | sb->sb_csum = disk_csum; | |
1386 | return cpu_to_le32(csum); | |
1387 | } | |
1388 | ||
2699b672 N |
1389 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1390 | int acknowledged); | |
3cb03002 | 1391 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1392 | { |
1393 | struct mdp_superblock_1 *sb; | |
1394 | int ret; | |
0f420358 | 1395 | sector_t sb_start; |
c6563a8c | 1396 | sector_t sectors; |
1da177e4 | 1397 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1398 | int bmask; |
1da177e4 LT |
1399 | |
1400 | /* | |
0f420358 | 1401 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1402 | * It is always aligned to a 4K boundary and |
1403 | * depeding on minor_version, it can be: | |
1404 | * 0: At least 8K, but less than 12K, from end of device | |
1405 | * 1: At start of device | |
1406 | * 2: 4K from start of device. | |
1407 | */ | |
1408 | switch(minor_version) { | |
1409 | case 0: | |
77304d2a | 1410 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1411 | sb_start -= 8*2; |
1412 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1413 | break; |
1414 | case 1: | |
0f420358 | 1415 | sb_start = 0; |
1da177e4 LT |
1416 | break; |
1417 | case 2: | |
0f420358 | 1418 | sb_start = 8; |
1da177e4 LT |
1419 | break; |
1420 | default: | |
1421 | return -EINVAL; | |
1422 | } | |
0f420358 | 1423 | rdev->sb_start = sb_start; |
1da177e4 | 1424 | |
0002b271 N |
1425 | /* superblock is rarely larger than 1K, but it can be larger, |
1426 | * and it is safe to read 4k, so we do that | |
1427 | */ | |
1428 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1429 | if (ret) return ret; |
1430 | ||
65a06f06 | 1431 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1432 | |
1433 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1434 | sb->major_version != cpu_to_le32(1) || | |
1435 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1436 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1437 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1438 | return -EINVAL; |
1439 | ||
1440 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1441 | printk("md: invalid superblock checksum on %s\n", | |
1442 | bdevname(rdev->bdev,b)); | |
1443 | return -EINVAL; | |
1444 | } | |
1445 | if (le64_to_cpu(sb->data_size) < 10) { | |
1446 | printk("md: data_size too small on %s\n", | |
1447 | bdevname(rdev->bdev,b)); | |
1448 | return -EINVAL; | |
1449 | } | |
c6563a8c N |
1450 | if (sb->pad0 || |
1451 | sb->pad3[0] || | |
1452 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1453 | /* Some padding is non-zero, might be a new feature */ | |
1454 | return -EINVAL; | |
e11e93fa | 1455 | |
1da177e4 LT |
1456 | rdev->preferred_minor = 0xffff; |
1457 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1458 | rdev->new_data_offset = rdev->data_offset; |
1459 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1460 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1461 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1462 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1463 | |
0002b271 | 1464 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1465 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1466 | if (rdev->sb_size & bmask) |
a1801f85 N |
1467 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1468 | ||
1469 | if (minor_version | |
0f420358 | 1470 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1471 | return -EINVAL; |
c6563a8c N |
1472 | if (minor_version |
1473 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1474 | return -EINVAL; | |
0002b271 | 1475 | |
31b65a0d N |
1476 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1477 | rdev->desc_nr = -1; | |
1478 | else | |
1479 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1480 | ||
2699b672 N |
1481 | if (!rdev->bb_page) { |
1482 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1483 | if (!rdev->bb_page) | |
1484 | return -ENOMEM; | |
1485 | } | |
1486 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1487 | rdev->badblocks.count == 0) { | |
1488 | /* need to load the bad block list. | |
1489 | * Currently we limit it to one page. | |
1490 | */ | |
1491 | s32 offset; | |
1492 | sector_t bb_sector; | |
1493 | u64 *bbp; | |
1494 | int i; | |
1495 | int sectors = le16_to_cpu(sb->bblog_size); | |
1496 | if (sectors > (PAGE_SIZE / 512)) | |
1497 | return -EINVAL; | |
1498 | offset = le32_to_cpu(sb->bblog_offset); | |
1499 | if (offset == 0) | |
1500 | return -EINVAL; | |
1501 | bb_sector = (long long)offset; | |
1502 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1503 | rdev->bb_page, READ, true)) | |
1504 | return -EIO; | |
1505 | bbp = (u64 *)page_address(rdev->bb_page); | |
1506 | rdev->badblocks.shift = sb->bblog_shift; | |
1507 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1508 | u64 bb = le64_to_cpu(*bbp); | |
1509 | int count = bb & (0x3ff); | |
1510 | u64 sector = bb >> 10; | |
1511 | sector <<= sb->bblog_shift; | |
1512 | count <<= sb->bblog_shift; | |
1513 | if (bb + 1 == 0) | |
1514 | break; | |
1515 | if (md_set_badblocks(&rdev->badblocks, | |
1516 | sector, count, 1) == 0) | |
1517 | return -EINVAL; | |
1518 | } | |
486adf72 N |
1519 | } else if (sb->bblog_offset != 0) |
1520 | rdev->badblocks.shift = 0; | |
2699b672 | 1521 | |
9a7b2b0f | 1522 | if (!refdev) { |
8ed75463 | 1523 | ret = 1; |
9a7b2b0f | 1524 | } else { |
1da177e4 | 1525 | __u64 ev1, ev2; |
65a06f06 | 1526 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1527 | |
1528 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1529 | sb->level != refsb->level || | |
1530 | sb->layout != refsb->layout || | |
1531 | sb->chunksize != refsb->chunksize) { | |
1532 | printk(KERN_WARNING "md: %s has strangely different" | |
1533 | " superblock to %s\n", | |
1534 | bdevname(rdev->bdev,b), | |
1535 | bdevname(refdev->bdev,b2)); | |
1536 | return -EINVAL; | |
1537 | } | |
1538 | ev1 = le64_to_cpu(sb->events); | |
1539 | ev2 = le64_to_cpu(refsb->events); | |
1540 | ||
1541 | if (ev1 > ev2) | |
8ed75463 N |
1542 | ret = 1; |
1543 | else | |
1544 | ret = 0; | |
1da177e4 | 1545 | } |
c6563a8c N |
1546 | if (minor_version) { |
1547 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1548 | sectors -= rdev->data_offset; | |
1549 | } else | |
1550 | sectors = rdev->sb_start; | |
1551 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1552 | return -EINVAL; |
dd8ac336 | 1553 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1554 | return ret; |
1da177e4 LT |
1555 | } |
1556 | ||
fd01b88c | 1557 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1558 | { |
65a06f06 | 1559 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1560 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1561 | |
41158c7e | 1562 | rdev->raid_disk = -1; |
c5d79adb N |
1563 | clear_bit(Faulty, &rdev->flags); |
1564 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1565 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1566 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1567 | |
1da177e4 LT |
1568 | if (mddev->raid_disks == 0) { |
1569 | mddev->major_version = 1; | |
1570 | mddev->patch_version = 0; | |
e691063a | 1571 | mddev->external = 0; |
9d8f0363 | 1572 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1573 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1574 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1575 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1576 | mddev->clevel[0] = 0; |
1da177e4 LT |
1577 | mddev->layout = le32_to_cpu(sb->layout); |
1578 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1579 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1580 | mddev->events = ev1; |
c3d9714e | 1581 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1582 | mddev->bitmap_info.space = 0; |
1583 | /* Default location for bitmap is 1K after superblock | |
1584 | * using 3K - total of 4K | |
1585 | */ | |
c3d9714e | 1586 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1587 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1588 | mddev->reshape_backwards = 0; |
1589 | ||
1da177e4 LT |
1590 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1591 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1592 | ||
1593 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1594 | |
71c0805c | 1595 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1596 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1597 | mddev->bitmap_info.offset = |
1598 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1599 | /* Metadata doesn't record how much space is available. |
1600 | * For 1.0, we assume we can use up to the superblock | |
1601 | * if before, else to 4K beyond superblock. | |
1602 | * For others, assume no change is possible. | |
1603 | */ | |
1604 | if (mddev->minor_version > 0) | |
1605 | mddev->bitmap_info.space = 0; | |
1606 | else if (mddev->bitmap_info.offset > 0) | |
1607 | mddev->bitmap_info.space = | |
1608 | 8 - mddev->bitmap_info.offset; | |
1609 | else | |
1610 | mddev->bitmap_info.space = | |
1611 | -mddev->bitmap_info.offset; | |
1612 | } | |
e11e93fa | 1613 | |
f6705578 N |
1614 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1615 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1616 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1617 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1618 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1619 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1620 | if (mddev->delta_disks < 0 || |
1621 | (mddev->delta_disks == 0 && | |
1622 | (le32_to_cpu(sb->feature_map) | |
1623 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1624 | mddev->reshape_backwards = 1; | |
f6705578 N |
1625 | } else { |
1626 | mddev->reshape_position = MaxSector; | |
1627 | mddev->delta_disks = 0; | |
1628 | mddev->new_level = mddev->level; | |
1629 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1630 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1631 | } |
1632 | ||
41158c7e | 1633 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1634 | /* Insist of good event counter while assembling, except for |
1635 | * spares (which don't need an event count) */ | |
1da177e4 | 1636 | ++ev1; |
be6800a7 N |
1637 | if (rdev->desc_nr >= 0 && |
1638 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1639 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1640 | if (ev1 < mddev->events) | |
1641 | return -EINVAL; | |
41158c7e N |
1642 | } else if (mddev->bitmap) { |
1643 | /* If adding to array with a bitmap, then we can accept an | |
1644 | * older device, but not too old. | |
1645 | */ | |
41158c7e N |
1646 | if (ev1 < mddev->bitmap->events_cleared) |
1647 | return 0; | |
8313b8e5 N |
1648 | if (ev1 < mddev->events) |
1649 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1650 | } else { |
1651 | if (ev1 < mddev->events) | |
1652 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1653 | return 0; | |
1654 | } | |
1da177e4 LT |
1655 | if (mddev->level != LEVEL_MULTIPATH) { |
1656 | int role; | |
3673f305 N |
1657 | if (rdev->desc_nr < 0 || |
1658 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1659 | role = 0xffff; | |
1660 | rdev->desc_nr = -1; | |
1661 | } else | |
1662 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1663 | switch(role) { |
1664 | case 0xffff: /* spare */ | |
1da177e4 LT |
1665 | break; |
1666 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1667 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1668 | break; |
1669 | default: | |
f466722c | 1670 | rdev->saved_raid_disk = role; |
5fd6c1dc | 1671 | if ((le32_to_cpu(sb->feature_map) & |
f466722c | 1672 | MD_FEATURE_RECOVERY_OFFSET)) { |
5fd6c1dc | 1673 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
f466722c N |
1674 | if (!(le32_to_cpu(sb->feature_map) & |
1675 | MD_FEATURE_RECOVERY_BITMAP)) | |
1676 | rdev->saved_raid_disk = -1; | |
1677 | } else | |
5fd6c1dc | 1678 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1679 | rdev->raid_disk = role; |
1680 | break; | |
1681 | } | |
8ddf9efe N |
1682 | if (sb->devflags & WriteMostly1) |
1683 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1684 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1685 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1686 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1687 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1688 | |
1da177e4 LT |
1689 | return 0; |
1690 | } | |
1691 | ||
fd01b88c | 1692 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1693 | { |
1694 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1695 | struct md_rdev *rdev2; |
1da177e4 LT |
1696 | int max_dev, i; |
1697 | /* make rdev->sb match mddev and rdev data. */ | |
1698 | ||
65a06f06 | 1699 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1700 | |
1701 | sb->feature_map = 0; | |
1702 | sb->pad0 = 0; | |
5fd6c1dc | 1703 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1704 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1705 | ||
1706 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1707 | sb->events = cpu_to_le64(mddev->events); | |
1708 | if (mddev->in_sync) | |
1709 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1710 | else | |
1711 | sb->resync_offset = cpu_to_le64(0); | |
1712 | ||
1c05b4bc | 1713 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1714 | |
f0ca340c | 1715 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1716 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1717 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1718 | sb->level = cpu_to_le32(mddev->level); |
1719 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1720 | |
aeb9b211 N |
1721 | if (test_bit(WriteMostly, &rdev->flags)) |
1722 | sb->devflags |= WriteMostly1; | |
1723 | else | |
1724 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1725 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1726 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1727 | |
c3d9714e N |
1728 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1729 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1730 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1731 | } |
5fd6c1dc N |
1732 | |
1733 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1734 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1735 | sb->feature_map |= |
1736 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1737 | sb->recovery_offset = | |
1738 | cpu_to_le64(rdev->recovery_offset); | |
f466722c N |
1739 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
1740 | sb->feature_map |= | |
1741 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); | |
5fd6c1dc | 1742 | } |
2d78f8c4 N |
1743 | if (test_bit(Replacement, &rdev->flags)) |
1744 | sb->feature_map |= | |
1745 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1746 | |
f6705578 N |
1747 | if (mddev->reshape_position != MaxSector) { |
1748 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1749 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1750 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1751 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1752 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1753 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1754 | if (mddev->delta_disks == 0 && |
1755 | mddev->reshape_backwards) | |
1756 | sb->feature_map | |
1757 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1758 | if (rdev->new_data_offset != rdev->data_offset) { |
1759 | sb->feature_map | |
1760 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1761 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1762 | - rdev->data_offset)); | |
1763 | } | |
f6705578 | 1764 | } |
a654b9d8 | 1765 | |
2699b672 N |
1766 | if (rdev->badblocks.count == 0) |
1767 | /* Nothing to do for bad blocks*/ ; | |
1768 | else if (sb->bblog_offset == 0) | |
1769 | /* Cannot record bad blocks on this device */ | |
1770 | md_error(mddev, rdev); | |
1771 | else { | |
1772 | struct badblocks *bb = &rdev->badblocks; | |
1773 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1774 | u64 *p = bb->page; | |
1775 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1776 | if (bb->changed) { | |
1777 | unsigned seq; | |
1778 | ||
1779 | retry: | |
1780 | seq = read_seqbegin(&bb->lock); | |
1781 | ||
1782 | memset(bbp, 0xff, PAGE_SIZE); | |
1783 | ||
1784 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1785 | u64 internal_bb = p[i]; |
2699b672 N |
1786 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1787 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1788 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1789 | } |
d0962936 | 1790 | bb->changed = 0; |
2699b672 N |
1791 | if (read_seqretry(&bb->lock, seq)) |
1792 | goto retry; | |
1793 | ||
1794 | bb->sector = (rdev->sb_start + | |
1795 | (int)le32_to_cpu(sb->bblog_offset)); | |
1796 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1797 | } |
1798 | } | |
1799 | ||
1da177e4 | 1800 | max_dev = 0; |
dafb20fa | 1801 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1802 | if (rdev2->desc_nr+1 > max_dev) |
1803 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1804 | |
70471daf N |
1805 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1806 | int bmask; | |
a778b73f | 1807 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1808 | rdev->sb_size = max_dev * 2 + 256; |
1809 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1810 | if (rdev->sb_size & bmask) | |
1811 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1812 | } else |
1813 | max_dev = le32_to_cpu(sb->max_dev); | |
1814 | ||
1da177e4 LT |
1815 | for (i=0; i<max_dev;i++) |
1816 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
f72ffdd6 | 1817 | |
dafb20fa | 1818 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1819 | i = rdev2->desc_nr; |
b2d444d7 | 1820 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1821 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1822 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1823 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1824 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1825 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1826 | else |
1827 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1828 | } | |
1829 | ||
1da177e4 LT |
1830 | sb->sb_csum = calc_sb_1_csum(sb); |
1831 | } | |
1832 | ||
0cd17fec | 1833 | static unsigned long long |
3cb03002 | 1834 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1835 | { |
1836 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1837 | sector_t max_sectors; |
58c0fed4 | 1838 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1839 | return 0; /* component must fit device */ |
c6563a8c N |
1840 | if (rdev->data_offset != rdev->new_data_offset) |
1841 | return 0; /* too confusing */ | |
0f420358 | 1842 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1843 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1844 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1845 | max_sectors -= rdev->data_offset; |
1846 | if (!num_sectors || num_sectors > max_sectors) | |
1847 | num_sectors = max_sectors; | |
c3d9714e | 1848 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1849 | /* minor version 0 with bitmap we can't move */ |
1850 | return 0; | |
1851 | } else { | |
1852 | /* minor version 0; superblock after data */ | |
0f420358 | 1853 | sector_t sb_start; |
77304d2a | 1854 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1855 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1856 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1857 | if (!num_sectors || num_sectors > max_sectors) |
1858 | num_sectors = max_sectors; | |
0f420358 | 1859 | rdev->sb_start = sb_start; |
0cd17fec | 1860 | } |
65a06f06 | 1861 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1862 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1863 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1864 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1865 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1866 | rdev->sb_page); |
1867 | md_super_wait(rdev->mddev); | |
c26a44ed | 1868 | return num_sectors; |
c6563a8c N |
1869 | |
1870 | } | |
1871 | ||
1872 | static int | |
1873 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1874 | unsigned long long new_offset) | |
1875 | { | |
1876 | /* All necessary checks on new >= old have been done */ | |
1877 | struct bitmap *bitmap; | |
1878 | if (new_offset >= rdev->data_offset) | |
1879 | return 1; | |
1880 | ||
1881 | /* with 1.0 metadata, there is no metadata to tread on | |
1882 | * so we can always move back */ | |
1883 | if (rdev->mddev->minor_version == 0) | |
1884 | return 1; | |
1885 | ||
1886 | /* otherwise we must be sure not to step on | |
1887 | * any metadata, so stay: | |
1888 | * 36K beyond start of superblock | |
1889 | * beyond end of badblocks | |
1890 | * beyond write-intent bitmap | |
1891 | */ | |
1892 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1893 | return 0; | |
1894 | bitmap = rdev->mddev->bitmap; | |
1895 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1896 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 1897 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
1898 | return 0; |
1899 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1900 | return 0; | |
1901 | ||
1902 | return 1; | |
0cd17fec | 1903 | } |
1da177e4 | 1904 | |
75c96f85 | 1905 | static struct super_type super_types[] = { |
1da177e4 LT |
1906 | [0] = { |
1907 | .name = "0.90.0", | |
1908 | .owner = THIS_MODULE, | |
0cd17fec CW |
1909 | .load_super = super_90_load, |
1910 | .validate_super = super_90_validate, | |
1911 | .sync_super = super_90_sync, | |
1912 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1913 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1914 | }, |
1915 | [1] = { | |
1916 | .name = "md-1", | |
1917 | .owner = THIS_MODULE, | |
0cd17fec CW |
1918 | .load_super = super_1_load, |
1919 | .validate_super = super_1_validate, | |
1920 | .sync_super = super_1_sync, | |
1921 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1922 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1923 | }, |
1924 | }; | |
1da177e4 | 1925 | |
fd01b88c | 1926 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1927 | { |
1928 | if (mddev->sync_super) { | |
1929 | mddev->sync_super(mddev, rdev); | |
1930 | return; | |
1931 | } | |
1932 | ||
1933 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1934 | ||
1935 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1936 | } | |
1937 | ||
fd01b88c | 1938 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1939 | { |
3cb03002 | 1940 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1941 | |
4b80991c N |
1942 | rcu_read_lock(); |
1943 | rdev_for_each_rcu(rdev, mddev1) | |
1944 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1945 | if (rdev->bdev->bd_contains == |
4b80991c N |
1946 | rdev2->bdev->bd_contains) { |
1947 | rcu_read_unlock(); | |
7dd5e7c3 | 1948 | return 1; |
4b80991c N |
1949 | } |
1950 | rcu_read_unlock(); | |
1da177e4 LT |
1951 | return 0; |
1952 | } | |
1953 | ||
1954 | static LIST_HEAD(pending_raid_disks); | |
1955 | ||
ac5e7113 AN |
1956 | /* |
1957 | * Try to register data integrity profile for an mddev | |
1958 | * | |
1959 | * This is called when an array is started and after a disk has been kicked | |
1960 | * from the array. It only succeeds if all working and active component devices | |
1961 | * are integrity capable with matching profiles. | |
1962 | */ | |
fd01b88c | 1963 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1964 | { |
3cb03002 | 1965 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1966 | |
1967 | if (list_empty(&mddev->disks)) | |
1968 | return 0; /* nothing to do */ | |
629acb6a JB |
1969 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1970 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 1971 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
1972 | /* skip spares and non-functional disks */ |
1973 | if (test_bit(Faulty, &rdev->flags)) | |
1974 | continue; | |
1975 | if (rdev->raid_disk < 0) | |
1976 | continue; | |
ac5e7113 AN |
1977 | if (!reference) { |
1978 | /* Use the first rdev as the reference */ | |
1979 | reference = rdev; | |
1980 | continue; | |
1981 | } | |
1982 | /* does this rdev's profile match the reference profile? */ | |
1983 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1984 | rdev->bdev->bd_disk) < 0) | |
1985 | return -EINVAL; | |
1986 | } | |
89078d57 MP |
1987 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1988 | return 0; | |
ac5e7113 AN |
1989 | /* |
1990 | * All component devices are integrity capable and have matching | |
1991 | * profiles, register the common profile for the md device. | |
1992 | */ | |
1993 | if (blk_integrity_register(mddev->gendisk, | |
1994 | bdev_get_integrity(reference->bdev)) != 0) { | |
1995 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1996 | mdname(mddev)); | |
1997 | return -EINVAL; | |
1998 | } | |
a91a2785 MP |
1999 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
2000 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
2001 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
2002 | mdname(mddev)); | |
2003 | return -EINVAL; | |
2004 | } | |
ac5e7113 AN |
2005 | return 0; |
2006 | } | |
2007 | EXPORT_SYMBOL(md_integrity_register); | |
2008 | ||
2009 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 2010 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 2011 | { |
2863b9eb JB |
2012 | struct blk_integrity *bi_rdev; |
2013 | struct blk_integrity *bi_mddev; | |
2014 | ||
2015 | if (!mddev->gendisk) | |
2016 | return; | |
2017 | ||
2018 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
2019 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 2020 | |
ac5e7113 | 2021 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 2022 | return; |
ac5e7113 | 2023 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 2024 | return; |
ac5e7113 AN |
2025 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2026 | rdev->bdev->bd_disk) >= 0) | |
2027 | return; | |
2028 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2029 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2030 | } |
ac5e7113 | 2031 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2032 | |
f72ffdd6 | 2033 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 2034 | { |
7dd5e7c3 | 2035 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2036 | struct kobject *ko; |
1edf80d3 | 2037 | char *s; |
5e55e2f5 | 2038 | int err; |
1da177e4 | 2039 | |
11e2ede0 DW |
2040 | /* prevent duplicates */ |
2041 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2042 | return -EEXIST; | |
2043 | ||
dd8ac336 AN |
2044 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2045 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2046 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2047 | if (mddev->pers) { |
2048 | /* Cannot change size, so fail | |
2049 | * If mddev->level <= 0, then we don't care | |
2050 | * about aligning sizes (e.g. linear) | |
2051 | */ | |
2052 | if (mddev->level > 0) | |
2053 | return -ENOSPC; | |
2054 | } else | |
dd8ac336 | 2055 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2056 | } |
1da177e4 LT |
2057 | |
2058 | /* Verify rdev->desc_nr is unique. | |
2059 | * If it is -1, assign a free number, else | |
2060 | * check number is not in use | |
2061 | */ | |
4878e9eb | 2062 | rcu_read_lock(); |
1da177e4 LT |
2063 | if (rdev->desc_nr < 0) { |
2064 | int choice = 0; | |
4878e9eb N |
2065 | if (mddev->pers) |
2066 | choice = mddev->raid_disks; | |
2067 | while (find_rdev_nr_rcu(mddev, choice)) | |
1da177e4 LT |
2068 | choice++; |
2069 | rdev->desc_nr = choice; | |
2070 | } else { | |
4878e9eb N |
2071 | if (find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
2072 | rcu_read_unlock(); | |
1da177e4 | 2073 | return -EBUSY; |
4878e9eb | 2074 | } |
1da177e4 | 2075 | } |
4878e9eb | 2076 | rcu_read_unlock(); |
de01dfad N |
2077 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2078 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2079 | mdname(mddev), mddev->max_disks); | |
2080 | return -EBUSY; | |
2081 | } | |
19133a42 | 2082 | bdevname(rdev->bdev,b); |
649316b2 | 2083 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2084 | *s = '!'; |
649316b2 | 2085 | |
1da177e4 | 2086 | rdev->mddev = mddev; |
19133a42 | 2087 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2088 | |
b2d6db58 | 2089 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2090 | goto fail; |
86e6ffdd | 2091 | |
0762b8bd | 2092 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2093 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2094 | /* failure here is OK */; | |
2095 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2096 | |
4b80991c | 2097 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2098 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2099 | |
2100 | /* May as well allow recovery to be retried once */ | |
5389042f | 2101 | mddev->recovery_disabled++; |
3f9d99c1 | 2102 | |
1da177e4 | 2103 | return 0; |
5e55e2f5 N |
2104 | |
2105 | fail: | |
2106 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2107 | b, mdname(mddev)); | |
2108 | return err; | |
1da177e4 LT |
2109 | } |
2110 | ||
177a99b2 | 2111 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2112 | { |
3cb03002 | 2113 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2114 | kobject_del(&rdev->kobj); |
177a99b2 | 2115 | kobject_put(&rdev->kobj); |
5792a285 N |
2116 | } |
2117 | ||
f72ffdd6 | 2118 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2119 | { |
2120 | char b[BDEVNAME_SIZE]; | |
403df478 | 2121 | |
49731baa | 2122 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2123 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2124 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2125 | rdev->mddev = NULL; | |
86e6ffdd | 2126 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2127 | sysfs_put(rdev->sysfs_state); |
2128 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2129 | rdev->badblocks.count = 0; |
5792a285 | 2130 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2131 | * writing to 'remove' to "dev/state". We also need |
2132 | * to delay it due to rcu usage. | |
5792a285 | 2133 | */ |
4b80991c | 2134 | synchronize_rcu(); |
177a99b2 N |
2135 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2136 | kobject_get(&rdev->kobj); | |
e804ac78 | 2137 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2138 | } |
2139 | ||
2140 | /* | |
2141 | * prevent the device from being mounted, repartitioned or | |
2142 | * otherwise reused by a RAID array (or any other kernel | |
2143 | * subsystem), by bd_claiming the device. | |
2144 | */ | |
3cb03002 | 2145 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2146 | { |
2147 | int err = 0; | |
2148 | struct block_device *bdev; | |
2149 | char b[BDEVNAME_SIZE]; | |
2150 | ||
d4d77629 | 2151 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2152 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2153 | if (IS_ERR(bdev)) { |
2154 | printk(KERN_ERR "md: could not open %s.\n", | |
2155 | __bdevname(dev, b)); | |
2156 | return PTR_ERR(bdev); | |
2157 | } | |
1da177e4 LT |
2158 | rdev->bdev = bdev; |
2159 | return err; | |
2160 | } | |
2161 | ||
3cb03002 | 2162 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2163 | { |
2164 | struct block_device *bdev = rdev->bdev; | |
2165 | rdev->bdev = NULL; | |
e525fd89 | 2166 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2167 | } |
2168 | ||
2169 | void md_autodetect_dev(dev_t dev); | |
2170 | ||
f72ffdd6 | 2171 | static void export_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2172 | { |
2173 | char b[BDEVNAME_SIZE]; | |
403df478 | 2174 | |
1da177e4 LT |
2175 | printk(KERN_INFO "md: export_rdev(%s)\n", |
2176 | bdevname(rdev->bdev,b)); | |
545c8795 | 2177 | md_rdev_clear(rdev); |
1da177e4 | 2178 | #ifndef MODULE |
d0fae18f N |
2179 | if (test_bit(AutoDetected, &rdev->flags)) |
2180 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2181 | #endif |
2182 | unlock_rdev(rdev); | |
86e6ffdd | 2183 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2184 | } |
2185 | ||
f72ffdd6 | 2186 | static void kick_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2187 | { |
2188 | unbind_rdev_from_array(rdev); | |
2189 | export_rdev(rdev); | |
2190 | } | |
2191 | ||
fd01b88c | 2192 | static void export_array(struct mddev *mddev) |
1da177e4 | 2193 | { |
0638bb0e | 2194 | struct md_rdev *rdev; |
1da177e4 | 2195 | |
0638bb0e N |
2196 | while (!list_empty(&mddev->disks)) { |
2197 | rdev = list_first_entry(&mddev->disks, struct md_rdev, | |
2198 | same_set); | |
1da177e4 LT |
2199 | kick_rdev_from_array(rdev); |
2200 | } | |
1da177e4 LT |
2201 | mddev->raid_disks = 0; |
2202 | mddev->major_version = 0; | |
2203 | } | |
2204 | ||
f72ffdd6 | 2205 | static void sync_sbs(struct mddev *mddev, int nospares) |
1da177e4 | 2206 | { |
42543769 N |
2207 | /* Update each superblock (in-memory image), but |
2208 | * if we are allowed to, skip spares which already | |
2209 | * have the right event counter, or have one earlier | |
2210 | * (which would mean they aren't being marked as dirty | |
2211 | * with the rest of the array) | |
2212 | */ | |
3cb03002 | 2213 | struct md_rdev *rdev; |
dafb20fa | 2214 | rdev_for_each(rdev, mddev) { |
42543769 N |
2215 | if (rdev->sb_events == mddev->events || |
2216 | (nospares && | |
2217 | rdev->raid_disk < 0 && | |
42543769 N |
2218 | rdev->sb_events+1 == mddev->events)) { |
2219 | /* Don't update this superblock */ | |
2220 | rdev->sb_loaded = 2; | |
2221 | } else { | |
076f968b | 2222 | sync_super(mddev, rdev); |
42543769 N |
2223 | rdev->sb_loaded = 1; |
2224 | } | |
1da177e4 LT |
2225 | } |
2226 | } | |
2227 | ||
f72ffdd6 | 2228 | static void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2229 | { |
3cb03002 | 2230 | struct md_rdev *rdev; |
06d91a5f | 2231 | int sync_req; |
42543769 | 2232 | int nospares = 0; |
2699b672 | 2233 | int any_badblocks_changed = 0; |
1da177e4 | 2234 | |
d87f064f N |
2235 | if (mddev->ro) { |
2236 | if (force_change) | |
2237 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2238 | return; | |
2239 | } | |
1da177e4 | 2240 | repeat: |
3a3a5ddb | 2241 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2242 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2243 | if (rdev->raid_disk >= 0 && |
2244 | mddev->delta_disks >= 0 && | |
2245 | !test_bit(In_sync, &rdev->flags) && | |
2246 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2247 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2248 | ||
f72ffdd6 | 2249 | } |
bd52b746 | 2250 | if (!mddev->persistent) { |
070dc6dd | 2251 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2252 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2253 | if (!mddev->external) { |
d97a41dc | 2254 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2255 | rdev_for_each(rdev, mddev) { |
de393cde | 2256 | if (rdev->badblocks.changed) { |
d0962936 | 2257 | rdev->badblocks.changed = 0; |
de393cde N |
2258 | md_ack_all_badblocks(&rdev->badblocks); |
2259 | md_error(mddev, rdev); | |
2260 | } | |
2261 | clear_bit(Blocked, &rdev->flags); | |
2262 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2263 | wake_up(&rdev->blocked_wait); | |
2264 | } | |
2265 | } | |
3a3a5ddb N |
2266 | wake_up(&mddev->sb_wait); |
2267 | return; | |
2268 | } | |
2269 | ||
85572d7c | 2270 | spin_lock(&mddev->lock); |
84692195 | 2271 | |
3a3a5ddb N |
2272 | mddev->utime = get_seconds(); |
2273 | ||
850b2b42 N |
2274 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2275 | force_change = 1; | |
2276 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2277 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2278 | * though if events isn't the right even/odd, we will have to do | |
2279 | * spares after all | |
2280 | */ | |
2281 | nospares = 1; | |
2282 | if (force_change) | |
2283 | nospares = 0; | |
2284 | if (mddev->degraded) | |
84692195 N |
2285 | /* If the array is degraded, then skipping spares is both |
2286 | * dangerous and fairly pointless. | |
2287 | * Dangerous because a device that was removed from the array | |
2288 | * might have a event_count that still looks up-to-date, | |
2289 | * so it can be re-added without a resync. | |
2290 | * Pointless because if there are any spares to skip, | |
2291 | * then a recovery will happen and soon that array won't | |
2292 | * be degraded any more and the spare can go back to sleep then. | |
2293 | */ | |
850b2b42 | 2294 | nospares = 0; |
84692195 | 2295 | |
06d91a5f | 2296 | sync_req = mddev->in_sync; |
42543769 N |
2297 | |
2298 | /* If this is just a dirty<->clean transition, and the array is clean | |
2299 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2300 | if (nospares |
42543769 | 2301 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2302 | && mddev->can_decrease_events |
2303 | && mddev->events != 1) { | |
42543769 | 2304 | mddev->events--; |
a8707c08 N |
2305 | mddev->can_decrease_events = 0; |
2306 | } else { | |
42543769 N |
2307 | /* otherwise we have to go forward and ... */ |
2308 | mddev->events ++; | |
a8707c08 | 2309 | mddev->can_decrease_events = nospares; |
42543769 | 2310 | } |
1da177e4 | 2311 | |
403df478 N |
2312 | /* |
2313 | * This 64-bit counter should never wrap. | |
2314 | * Either we are in around ~1 trillion A.C., assuming | |
2315 | * 1 reboot per second, or we have a bug... | |
2316 | */ | |
2317 | WARN_ON(mddev->events == 0); | |
2699b672 | 2318 | |
dafb20fa | 2319 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2320 | if (rdev->badblocks.changed) |
2321 | any_badblocks_changed++; | |
de393cde N |
2322 | if (test_bit(Faulty, &rdev->flags)) |
2323 | set_bit(FaultRecorded, &rdev->flags); | |
2324 | } | |
2699b672 | 2325 | |
e691063a | 2326 | sync_sbs(mddev, nospares); |
85572d7c | 2327 | spin_unlock(&mddev->lock); |
1da177e4 | 2328 | |
36a4e1fe N |
2329 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2330 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2331 | |
4ad13663 | 2332 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2333 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2334 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2335 | |
42543769 N |
2336 | if (rdev->sb_loaded != 1) |
2337 | continue; /* no noise on spare devices */ | |
1da177e4 | 2338 | |
f466722c | 2339 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2340 | md_super_write(mddev,rdev, |
0f420358 | 2341 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2342 | rdev->sb_page); |
36a4e1fe N |
2343 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2344 | bdevname(rdev->bdev, b), | |
2345 | (unsigned long long)rdev->sb_start); | |
42543769 | 2346 | rdev->sb_events = mddev->events; |
2699b672 N |
2347 | if (rdev->badblocks.size) { |
2348 | md_super_write(mddev, rdev, | |
2349 | rdev->badblocks.sector, | |
2350 | rdev->badblocks.size << 9, | |
2351 | rdev->bb_page); | |
2352 | rdev->badblocks.size = 0; | |
2353 | } | |
7bfa19f2 | 2354 | |
f466722c | 2355 | } else |
36a4e1fe N |
2356 | pr_debug("md: %s (skipping faulty)\n", |
2357 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2358 | |
7bfa19f2 | 2359 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2360 | /* only need to write one superblock... */ |
2361 | break; | |
2362 | } | |
a9701a30 | 2363 | md_super_wait(mddev); |
850b2b42 | 2364 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2365 | |
85572d7c | 2366 | spin_lock(&mddev->lock); |
850b2b42 N |
2367 | if (mddev->in_sync != sync_req || |
2368 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2369 | /* have to write it out again */ |
85572d7c | 2370 | spin_unlock(&mddev->lock); |
06d91a5f N |
2371 | goto repeat; |
2372 | } | |
850b2b42 | 2373 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
85572d7c | 2374 | spin_unlock(&mddev->lock); |
3d310eb7 | 2375 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2376 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2377 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2378 | |
dafb20fa | 2379 | rdev_for_each(rdev, mddev) { |
de393cde N |
2380 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2381 | clear_bit(Blocked, &rdev->flags); | |
2382 | ||
2383 | if (any_badblocks_changed) | |
2699b672 | 2384 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2385 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2386 | wake_up(&rdev->blocked_wait); | |
2387 | } | |
1da177e4 LT |
2388 | } |
2389 | ||
7f6ce769 | 2390 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2391 | * We want to accept with case. For this we use cmd_match. |
2392 | */ | |
2393 | static int cmd_match(const char *cmd, const char *str) | |
2394 | { | |
2395 | /* See if cmd, written into a sysfs file, matches | |
2396 | * str. They must either be the same, or cmd can | |
2397 | * have a trailing newline | |
2398 | */ | |
2399 | while (*cmd && *str && *cmd == *str) { | |
2400 | cmd++; | |
2401 | str++; | |
2402 | } | |
2403 | if (*cmd == '\n') | |
2404 | cmd++; | |
2405 | if (*str || *cmd) | |
2406 | return 0; | |
2407 | return 1; | |
2408 | } | |
2409 | ||
86e6ffdd N |
2410 | struct rdev_sysfs_entry { |
2411 | struct attribute attr; | |
3cb03002 N |
2412 | ssize_t (*show)(struct md_rdev *, char *); |
2413 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2414 | }; |
2415 | ||
2416 | static ssize_t | |
3cb03002 | 2417 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2418 | { |
2419 | char *sep = ""; | |
20a49ff6 | 2420 | size_t len = 0; |
86e6ffdd | 2421 | |
de393cde N |
2422 | if (test_bit(Faulty, &rdev->flags) || |
2423 | rdev->badblocks.unacked_exist) { | |
86e6ffdd N |
2424 | len+= sprintf(page+len, "%sfaulty",sep); |
2425 | sep = ","; | |
2426 | } | |
b2d444d7 | 2427 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2428 | len += sprintf(page+len, "%sin_sync",sep); |
2429 | sep = ","; | |
2430 | } | |
f655675b N |
2431 | if (test_bit(WriteMostly, &rdev->flags)) { |
2432 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2433 | sep = ","; | |
2434 | } | |
de393cde | 2435 | if (test_bit(Blocked, &rdev->flags) || |
52c64152 N |
2436 | (rdev->badblocks.unacked_exist |
2437 | && !test_bit(Faulty, &rdev->flags))) { | |
6bfe0b49 DW |
2438 | len += sprintf(page+len, "%sblocked", sep); |
2439 | sep = ","; | |
2440 | } | |
b2d444d7 N |
2441 | if (!test_bit(Faulty, &rdev->flags) && |
2442 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2443 | len += sprintf(page+len, "%sspare", sep); |
2444 | sep = ","; | |
2445 | } | |
d7a9d443 N |
2446 | if (test_bit(WriteErrorSeen, &rdev->flags)) { |
2447 | len += sprintf(page+len, "%swrite_error", sep); | |
2448 | sep = ","; | |
2449 | } | |
2d78f8c4 N |
2450 | if (test_bit(WantReplacement, &rdev->flags)) { |
2451 | len += sprintf(page+len, "%swant_replacement", sep); | |
2452 | sep = ","; | |
2453 | } | |
2454 | if (test_bit(Replacement, &rdev->flags)) { | |
2455 | len += sprintf(page+len, "%sreplacement", sep); | |
2456 | sep = ","; | |
2457 | } | |
2458 | ||
86e6ffdd N |
2459 | return len+sprintf(page+len, "\n"); |
2460 | } | |
2461 | ||
45dc2de1 | 2462 | static ssize_t |
3cb03002 | 2463 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2464 | { |
2465 | /* can write | |
de393cde | 2466 | * faulty - simulates an error |
45dc2de1 | 2467 | * remove - disconnects the device |
f655675b N |
2468 | * writemostly - sets write_mostly |
2469 | * -writemostly - clears write_mostly | |
de393cde N |
2470 | * blocked - sets the Blocked flags |
2471 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2472 | * insync - sets Insync providing device isn't active |
f466722c N |
2473 | * -insync - clear Insync for a device with a slot assigned, |
2474 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2475 | * write_error - sets WriteErrorSeen |
2476 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2477 | */ |
2478 | int err = -EINVAL; | |
2479 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2480 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2481 | if (test_bit(Faulty, &rdev->flags)) |
2482 | err = 0; | |
2483 | else | |
2484 | err = -EBUSY; | |
45dc2de1 N |
2485 | } else if (cmd_match(buf, "remove")) { |
2486 | if (rdev->raid_disk >= 0) | |
2487 | err = -EBUSY; | |
2488 | else { | |
fd01b88c | 2489 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2490 | kick_rdev_from_array(rdev); |
3f9d7b0d N |
2491 | if (mddev->pers) |
2492 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2493 | md_new_event(mddev); |
2494 | err = 0; | |
2495 | } | |
f655675b N |
2496 | } else if (cmd_match(buf, "writemostly")) { |
2497 | set_bit(WriteMostly, &rdev->flags); | |
2498 | err = 0; | |
2499 | } else if (cmd_match(buf, "-writemostly")) { | |
2500 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2501 | err = 0; |
2502 | } else if (cmd_match(buf, "blocked")) { | |
2503 | set_bit(Blocked, &rdev->flags); | |
2504 | err = 0; | |
2505 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2506 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2507 | rdev->badblocks.unacked_exist) { |
de393cde N |
2508 | /* metadata handler doesn't understand badblocks, |
2509 | * so we need to fail the device | |
2510 | */ | |
2511 | md_error(rdev->mddev, rdev); | |
2512 | } | |
6bfe0b49 | 2513 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2514 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2515 | wake_up(&rdev->blocked_wait); |
2516 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2517 | md_wakeup_thread(rdev->mddev->thread); | |
2518 | ||
6d56e278 N |
2519 | err = 0; |
2520 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2521 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2522 | err = 0; |
f466722c | 2523 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) { |
e1960f8c N |
2524 | if (rdev->mddev->pers == NULL) { |
2525 | clear_bit(In_sync, &rdev->flags); | |
2526 | rdev->saved_raid_disk = rdev->raid_disk; | |
2527 | rdev->raid_disk = -1; | |
2528 | err = 0; | |
2529 | } | |
d7a9d443 N |
2530 | } else if (cmd_match(buf, "write_error")) { |
2531 | set_bit(WriteErrorSeen, &rdev->flags); | |
2532 | err = 0; | |
2533 | } else if (cmd_match(buf, "-write_error")) { | |
2534 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2535 | err = 0; | |
2d78f8c4 N |
2536 | } else if (cmd_match(buf, "want_replacement")) { |
2537 | /* Any non-spare device that is not a replacement can | |
2538 | * become want_replacement at any time, but we then need to | |
2539 | * check if recovery is needed. | |
2540 | */ | |
2541 | if (rdev->raid_disk >= 0 && | |
2542 | !test_bit(Replacement, &rdev->flags)) | |
2543 | set_bit(WantReplacement, &rdev->flags); | |
2544 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2545 | md_wakeup_thread(rdev->mddev->thread); | |
2546 | err = 0; | |
2547 | } else if (cmd_match(buf, "-want_replacement")) { | |
2548 | /* Clearing 'want_replacement' is always allowed. | |
2549 | * Once replacements starts it is too late though. | |
2550 | */ | |
2551 | err = 0; | |
2552 | clear_bit(WantReplacement, &rdev->flags); | |
2553 | } else if (cmd_match(buf, "replacement")) { | |
2554 | /* Can only set a device as a replacement when array has not | |
2555 | * yet been started. Once running, replacement is automatic | |
2556 | * from spares, or by assigning 'slot'. | |
2557 | */ | |
2558 | if (rdev->mddev->pers) | |
2559 | err = -EBUSY; | |
2560 | else { | |
2561 | set_bit(Replacement, &rdev->flags); | |
2562 | err = 0; | |
2563 | } | |
2564 | } else if (cmd_match(buf, "-replacement")) { | |
2565 | /* Similarly, can only clear Replacement before start */ | |
2566 | if (rdev->mddev->pers) | |
2567 | err = -EBUSY; | |
2568 | else { | |
2569 | clear_bit(Replacement, &rdev->flags); | |
2570 | err = 0; | |
2571 | } | |
45dc2de1 | 2572 | } |
00bcb4ac N |
2573 | if (!err) |
2574 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2575 | return err ? err : len; |
2576 | } | |
80ca3a44 N |
2577 | static struct rdev_sysfs_entry rdev_state = |
2578 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2579 | |
4dbcdc75 | 2580 | static ssize_t |
3cb03002 | 2581 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2582 | { |
2583 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2584 | } | |
2585 | ||
2586 | static ssize_t | |
3cb03002 | 2587 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 N |
2588 | { |
2589 | char *e; | |
2590 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2591 | if (*buf && (*e == 0 || *e == '\n')) { | |
2592 | atomic_set(&rdev->corrected_errors, n); | |
2593 | return len; | |
2594 | } | |
2595 | return -EINVAL; | |
2596 | } | |
2597 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2598 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2599 | |
014236d2 | 2600 | static ssize_t |
3cb03002 | 2601 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2602 | { |
2603 | if (rdev->raid_disk < 0) | |
2604 | return sprintf(page, "none\n"); | |
2605 | else | |
2606 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2607 | } | |
2608 | ||
2609 | static ssize_t | |
3cb03002 | 2610 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 N |
2611 | { |
2612 | char *e; | |
c303da6d | 2613 | int err; |
014236d2 N |
2614 | int slot = simple_strtoul(buf, &e, 10); |
2615 | if (strncmp(buf, "none", 4)==0) | |
2616 | slot = -1; | |
2617 | else if (e==buf || (*e && *e!= '\n')) | |
2618 | return -EINVAL; | |
6c2fce2e | 2619 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2620 | /* Setting 'slot' on an active array requires also |
2621 | * updating the 'rd%d' link, and communicating | |
2622 | * with the personality with ->hot_*_disk. | |
2623 | * For now we only support removing | |
2624 | * failed/spare devices. This normally happens automatically, | |
2625 | * but not when the metadata is externally managed. | |
2626 | */ | |
c303da6d N |
2627 | if (rdev->raid_disk == -1) |
2628 | return -EEXIST; | |
2629 | /* personality does all needed checks */ | |
01393f3d | 2630 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2631 | return -EINVAL; |
746d3207 N |
2632 | clear_bit(Blocked, &rdev->flags); |
2633 | remove_and_add_spares(rdev->mddev, rdev); | |
2634 | if (rdev->raid_disk >= 0) | |
2635 | return -EBUSY; | |
c303da6d N |
2636 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2637 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2638 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2639 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2640 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2641 | */ |
2642 | ||
2643 | if (rdev->raid_disk != -1) | |
2644 | return -EBUSY; | |
2645 | ||
c6751b2b N |
2646 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2647 | return -EBUSY; | |
2648 | ||
6c2fce2e NB |
2649 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2650 | return -EINVAL; | |
2651 | ||
ba1b41b6 N |
2652 | if (slot >= rdev->mddev->raid_disks && |
2653 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2654 | return -ENOSPC; | |
2655 | ||
6c2fce2e NB |
2656 | rdev->raid_disk = slot; |
2657 | if (test_bit(In_sync, &rdev->flags)) | |
2658 | rdev->saved_raid_disk = slot; | |
2659 | else | |
2660 | rdev->saved_raid_disk = -1; | |
d30519fc | 2661 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2662 | clear_bit(Bitmap_sync, &rdev->flags); |
6c2fce2e NB |
2663 | err = rdev->mddev->pers-> |
2664 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2665 | if (err) { |
6c2fce2e | 2666 | rdev->raid_disk = -1; |
6c2fce2e | 2667 | return err; |
52664732 | 2668 | } else |
00bcb4ac | 2669 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2670 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2671 | /* failure here is OK */; |
6c2fce2e | 2672 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2673 | } else { |
ba1b41b6 N |
2674 | if (slot >= rdev->mddev->raid_disks && |
2675 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2676 | return -ENOSPC; |
2677 | rdev->raid_disk = slot; | |
2678 | /* assume it is working */ | |
c5d79adb N |
2679 | clear_bit(Faulty, &rdev->flags); |
2680 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2681 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2682 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2683 | } |
014236d2 N |
2684 | return len; |
2685 | } | |
2686 | ||
014236d2 | 2687 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2688 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2689 | |
93c8cad0 | 2690 | static ssize_t |
3cb03002 | 2691 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2692 | { |
6961ece4 | 2693 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2694 | } |
2695 | ||
2696 | static ssize_t | |
3cb03002 | 2697 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2698 | { |
c6563a8c | 2699 | unsigned long long offset; |
b29bebd6 | 2700 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 2701 | return -EINVAL; |
8ed0a521 | 2702 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2703 | return -EBUSY; |
dd8ac336 | 2704 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2705 | /* Must set offset before size, so overlap checks |
2706 | * can be sane */ | |
2707 | return -EBUSY; | |
93c8cad0 | 2708 | rdev->data_offset = offset; |
25f7fd47 | 2709 | rdev->new_data_offset = offset; |
93c8cad0 N |
2710 | return len; |
2711 | } | |
2712 | ||
2713 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2714 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2715 | |
c6563a8c N |
2716 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2717 | { | |
2718 | return sprintf(page, "%llu\n", | |
2719 | (unsigned long long)rdev->new_data_offset); | |
2720 | } | |
2721 | ||
2722 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2723 | const char *buf, size_t len) | |
2724 | { | |
2725 | unsigned long long new_offset; | |
2726 | struct mddev *mddev = rdev->mddev; | |
2727 | ||
b29bebd6 | 2728 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
2729 | return -EINVAL; |
2730 | ||
f851b60d N |
2731 | if (mddev->sync_thread || |
2732 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
2733 | return -EBUSY; |
2734 | if (new_offset == rdev->data_offset) | |
2735 | /* reset is always permitted */ | |
2736 | ; | |
2737 | else if (new_offset > rdev->data_offset) { | |
2738 | /* must not push array size beyond rdev_sectors */ | |
2739 | if (new_offset - rdev->data_offset | |
2740 | + mddev->dev_sectors > rdev->sectors) | |
2741 | return -E2BIG; | |
2742 | } | |
2743 | /* Metadata worries about other space details. */ | |
2744 | ||
2745 | /* decreasing the offset is inconsistent with a backwards | |
2746 | * reshape. | |
2747 | */ | |
2748 | if (new_offset < rdev->data_offset && | |
2749 | mddev->reshape_backwards) | |
2750 | return -EINVAL; | |
2751 | /* Increasing offset is inconsistent with forwards | |
2752 | * reshape. reshape_direction should be set to | |
2753 | * 'backwards' first. | |
2754 | */ | |
2755 | if (new_offset > rdev->data_offset && | |
2756 | !mddev->reshape_backwards) | |
2757 | return -EINVAL; | |
2758 | ||
2759 | if (mddev->pers && mddev->persistent && | |
2760 | !super_types[mddev->major_version] | |
2761 | .allow_new_offset(rdev, new_offset)) | |
2762 | return -E2BIG; | |
2763 | rdev->new_data_offset = new_offset; | |
2764 | if (new_offset > rdev->data_offset) | |
2765 | mddev->reshape_backwards = 1; | |
2766 | else if (new_offset < rdev->data_offset) | |
2767 | mddev->reshape_backwards = 0; | |
2768 | ||
2769 | return len; | |
2770 | } | |
2771 | static struct rdev_sysfs_entry rdev_new_offset = | |
2772 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2773 | ||
83303b61 | 2774 | static ssize_t |
3cb03002 | 2775 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2776 | { |
dd8ac336 | 2777 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2778 | } |
2779 | ||
c5d79adb N |
2780 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2781 | { | |
2782 | /* check if two start/length pairs overlap */ | |
2783 | if (s1+l1 <= s2) | |
2784 | return 0; | |
2785 | if (s2+l2 <= s1) | |
2786 | return 0; | |
2787 | return 1; | |
2788 | } | |
2789 | ||
b522adcd DW |
2790 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2791 | { | |
2792 | unsigned long long blocks; | |
2793 | sector_t new; | |
2794 | ||
b29bebd6 | 2795 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
2796 | return -EINVAL; |
2797 | ||
2798 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2799 | return -EINVAL; /* sector conversion overflow */ | |
2800 | ||
2801 | new = blocks * 2; | |
2802 | if (new != blocks * 2) | |
2803 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2804 | ||
2805 | *sectors = new; | |
2806 | return 0; | |
2807 | } | |
2808 | ||
83303b61 | 2809 | static ssize_t |
3cb03002 | 2810 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2811 | { |
fd01b88c | 2812 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2813 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2814 | sector_t sectors; |
27c529bb | 2815 | |
b522adcd | 2816 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2817 | return -EINVAL; |
c6563a8c N |
2818 | if (rdev->data_offset != rdev->new_data_offset) |
2819 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2820 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2821 | if (my_mddev->persistent) { |
dd8ac336 AN |
2822 | sectors = super_types[my_mddev->major_version]. |
2823 | rdev_size_change(rdev, sectors); | |
2824 | if (!sectors) | |
0cd17fec | 2825 | return -EBUSY; |
dd8ac336 | 2826 | } else if (!sectors) |
77304d2a | 2827 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2828 | rdev->data_offset; |
a6468539 N |
2829 | if (!my_mddev->pers->resize) |
2830 | /* Cannot change size for RAID0 or Linear etc */ | |
2831 | return -EINVAL; | |
0cd17fec | 2832 | } |
dd8ac336 | 2833 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2834 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2835 | |
dd8ac336 AN |
2836 | rdev->sectors = sectors; |
2837 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
2838 | /* Need to check that all other rdevs with the same |
2839 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
2840 | * the rdev lists safely. | |
2841 | * This check does not provide a hard guarantee, it | |
2842 | * just helps avoid dangerous mistakes. | |
c5d79adb | 2843 | */ |
fd01b88c | 2844 | struct mddev *mddev; |
c5d79adb | 2845 | int overlap = 0; |
159ec1fc | 2846 | struct list_head *tmp; |
c5d79adb | 2847 | |
8b1afc3d | 2848 | rcu_read_lock(); |
29ac4aa3 | 2849 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2850 | struct md_rdev *rdev2; |
c5d79adb | 2851 | |
dafb20fa | 2852 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
2853 | if (rdev->bdev == rdev2->bdev && |
2854 | rdev != rdev2 && | |
2855 | overlaps(rdev->data_offset, rdev->sectors, | |
2856 | rdev2->data_offset, | |
2857 | rdev2->sectors)) { | |
c5d79adb N |
2858 | overlap = 1; |
2859 | break; | |
2860 | } | |
c5d79adb N |
2861 | if (overlap) { |
2862 | mddev_put(mddev); | |
2863 | break; | |
2864 | } | |
2865 | } | |
8b1afc3d | 2866 | rcu_read_unlock(); |
c5d79adb N |
2867 | if (overlap) { |
2868 | /* Someone else could have slipped in a size | |
2869 | * change here, but doing so is just silly. | |
dd8ac336 | 2870 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2871 | * safe, and trust userspace not to race with |
2872 | * itself | |
2873 | */ | |
dd8ac336 | 2874 | rdev->sectors = oldsectors; |
c5d79adb N |
2875 | return -EBUSY; |
2876 | } | |
2877 | } | |
83303b61 N |
2878 | return len; |
2879 | } | |
2880 | ||
2881 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2882 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2883 | |
3cb03002 | 2884 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
2885 | { |
2886 | unsigned long long recovery_start = rdev->recovery_offset; | |
2887 | ||
2888 | if (test_bit(In_sync, &rdev->flags) || | |
2889 | recovery_start == MaxSector) | |
2890 | return sprintf(page, "none\n"); | |
2891 | ||
2892 | return sprintf(page, "%llu\n", recovery_start); | |
2893 | } | |
2894 | ||
3cb03002 | 2895 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
2896 | { |
2897 | unsigned long long recovery_start; | |
2898 | ||
2899 | if (cmd_match(buf, "none")) | |
2900 | recovery_start = MaxSector; | |
b29bebd6 | 2901 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
2902 | return -EINVAL; |
2903 | ||
2904 | if (rdev->mddev->pers && | |
2905 | rdev->raid_disk >= 0) | |
2906 | return -EBUSY; | |
2907 | ||
2908 | rdev->recovery_offset = recovery_start; | |
2909 | if (recovery_start == MaxSector) | |
2910 | set_bit(In_sync, &rdev->flags); | |
2911 | else | |
2912 | clear_bit(In_sync, &rdev->flags); | |
2913 | return len; | |
2914 | } | |
2915 | ||
2916 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2917 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2918 | ||
16c791a5 N |
2919 | static ssize_t |
2920 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2921 | static ssize_t | |
2922 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2923 | ||
3cb03002 | 2924 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2925 | { |
2926 | return badblocks_show(&rdev->badblocks, page, 0); | |
2927 | } | |
3cb03002 | 2928 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 2929 | { |
de393cde N |
2930 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
2931 | /* Maybe that ack was all we needed */ | |
2932 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
2933 | wake_up(&rdev->blocked_wait); | |
2934 | return rv; | |
16c791a5 N |
2935 | } |
2936 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2937 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2938 | ||
3cb03002 | 2939 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2940 | { |
2941 | return badblocks_show(&rdev->badblocks, page, 1); | |
2942 | } | |
3cb03002 | 2943 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
2944 | { |
2945 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2946 | } | |
2947 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
2948 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
2949 | ||
86e6ffdd N |
2950 | static struct attribute *rdev_default_attrs[] = { |
2951 | &rdev_state.attr, | |
4dbcdc75 | 2952 | &rdev_errors.attr, |
014236d2 | 2953 | &rdev_slot.attr, |
93c8cad0 | 2954 | &rdev_offset.attr, |
c6563a8c | 2955 | &rdev_new_offset.attr, |
83303b61 | 2956 | &rdev_size.attr, |
06e3c817 | 2957 | &rdev_recovery_start.attr, |
16c791a5 N |
2958 | &rdev_bad_blocks.attr, |
2959 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
2960 | NULL, |
2961 | }; | |
2962 | static ssize_t | |
2963 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2964 | { | |
2965 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2966 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
fd01b88c | 2967 | struct mddev *mddev = rdev->mddev; |
27c529bb | 2968 | ssize_t rv; |
86e6ffdd N |
2969 | |
2970 | if (!entry->show) | |
2971 | return -EIO; | |
27c529bb N |
2972 | |
2973 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2974 | if (!rv) { | |
2975 | if (rdev->mddev == NULL) | |
2976 | rv = -EBUSY; | |
2977 | else | |
2978 | rv = entry->show(rdev, page); | |
2979 | mddev_unlock(mddev); | |
2980 | } | |
2981 | return rv; | |
86e6ffdd N |
2982 | } |
2983 | ||
2984 | static ssize_t | |
2985 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2986 | const char *page, size_t length) | |
2987 | { | |
2988 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2989 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 2990 | ssize_t rv; |
fd01b88c | 2991 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
2992 | |
2993 | if (!entry->store) | |
2994 | return -EIO; | |
67463acb N |
2995 | if (!capable(CAP_SYS_ADMIN)) |
2996 | return -EACCES; | |
27c529bb | 2997 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2998 | if (!rv) { |
27c529bb N |
2999 | if (rdev->mddev == NULL) |
3000 | rv = -EBUSY; | |
3001 | else | |
3002 | rv = entry->store(rdev, page, length); | |
6a51830e | 3003 | mddev_unlock(mddev); |
ca388059 N |
3004 | } |
3005 | return rv; | |
86e6ffdd N |
3006 | } |
3007 | ||
3008 | static void rdev_free(struct kobject *ko) | |
3009 | { | |
3cb03002 | 3010 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3011 | kfree(rdev); |
3012 | } | |
52cf25d0 | 3013 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3014 | .show = rdev_attr_show, |
3015 | .store = rdev_attr_store, | |
3016 | }; | |
3017 | static struct kobj_type rdev_ktype = { | |
3018 | .release = rdev_free, | |
3019 | .sysfs_ops = &rdev_sysfs_ops, | |
3020 | .default_attrs = rdev_default_attrs, | |
3021 | }; | |
3022 | ||
3cb03002 | 3023 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3024 | { |
3025 | rdev->desc_nr = -1; | |
3026 | rdev->saved_raid_disk = -1; | |
3027 | rdev->raid_disk = -1; | |
3028 | rdev->flags = 0; | |
3029 | rdev->data_offset = 0; | |
c6563a8c | 3030 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3031 | rdev->sb_events = 0; |
3032 | rdev->last_read_error.tv_sec = 0; | |
3033 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3034 | rdev->sb_loaded = 0; |
3035 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3036 | atomic_set(&rdev->nr_pending, 0); |
3037 | atomic_set(&rdev->read_errors, 0); | |
3038 | atomic_set(&rdev->corrected_errors, 0); | |
3039 | ||
3040 | INIT_LIST_HEAD(&rdev->same_set); | |
3041 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3042 | |
3043 | /* Add space to store bad block list. | |
3044 | * This reserves the space even on arrays where it cannot | |
3045 | * be used - I wonder if that matters | |
3046 | */ | |
3047 | rdev->badblocks.count = 0; | |
486adf72 | 3048 | rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
2230dfe4 N |
3049 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3050 | seqlock_init(&rdev->badblocks.lock); | |
3051 | if (rdev->badblocks.page == NULL) | |
3052 | return -ENOMEM; | |
3053 | ||
3054 | return 0; | |
e8bb9a83 N |
3055 | } |
3056 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3057 | /* |
3058 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3059 | * | |
3060 | * mark the device faulty if: | |
3061 | * | |
3062 | * - the device is nonexistent (zero size) | |
3063 | * - the device has no valid superblock | |
3064 | * | |
3065 | * a faulty rdev _never_ has rdev->sb set. | |
3066 | */ | |
3cb03002 | 3067 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3068 | { |
3069 | char b[BDEVNAME_SIZE]; | |
3070 | int err; | |
3cb03002 | 3071 | struct md_rdev *rdev; |
1da177e4 LT |
3072 | sector_t size; |
3073 | ||
9ffae0cf | 3074 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3075 | if (!rdev) { |
3076 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3077 | return ERR_PTR(-ENOMEM); | |
3078 | } | |
1da177e4 | 3079 | |
2230dfe4 N |
3080 | err = md_rdev_init(rdev); |
3081 | if (err) | |
3082 | goto abort_free; | |
3083 | err = alloc_disk_sb(rdev); | |
3084 | if (err) | |
1da177e4 LT |
3085 | goto abort_free; |
3086 | ||
c5d79adb | 3087 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3088 | if (err) |
3089 | goto abort_free; | |
3090 | ||
f9cb074b | 3091 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3092 | |
77304d2a | 3093 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3094 | if (!size) { |
f72ffdd6 | 3095 | printk(KERN_WARNING |
1da177e4 LT |
3096 | "md: %s has zero or unknown size, marking faulty!\n", |
3097 | bdevname(rdev->bdev,b)); | |
3098 | err = -EINVAL; | |
3099 | goto abort_free; | |
3100 | } | |
3101 | ||
3102 | if (super_format >= 0) { | |
3103 | err = super_types[super_format]. | |
3104 | load_super(rdev, NULL, super_minor); | |
3105 | if (err == -EINVAL) { | |
df968c4e N |
3106 | printk(KERN_WARNING |
3107 | "md: %s does not have a valid v%d.%d " | |
3108 | "superblock, not importing!\n", | |
3109 | bdevname(rdev->bdev,b), | |
3110 | super_format, super_minor); | |
1da177e4 LT |
3111 | goto abort_free; |
3112 | } | |
3113 | if (err < 0) { | |
f72ffdd6 | 3114 | printk(KERN_WARNING |
1da177e4 LT |
3115 | "md: could not read %s's sb, not importing!\n", |
3116 | bdevname(rdev->bdev,b)); | |
3117 | goto abort_free; | |
3118 | } | |
3119 | } | |
6bfe0b49 | 3120 | |
1da177e4 LT |
3121 | return rdev; |
3122 | ||
3123 | abort_free: | |
2699b672 N |
3124 | if (rdev->bdev) |
3125 | unlock_rdev(rdev); | |
545c8795 | 3126 | md_rdev_clear(rdev); |
1da177e4 LT |
3127 | kfree(rdev); |
3128 | return ERR_PTR(err); | |
3129 | } | |
3130 | ||
3131 | /* | |
3132 | * Check a full RAID array for plausibility | |
3133 | */ | |
3134 | ||
f72ffdd6 | 3135 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3136 | { |
3137 | int i; | |
3cb03002 | 3138 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3139 | char b[BDEVNAME_SIZE]; |
3140 | ||
3141 | freshest = NULL; | |
dafb20fa | 3142 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3143 | switch (super_types[mddev->major_version]. |
3144 | load_super(rdev, freshest, mddev->minor_version)) { | |
3145 | case 1: | |
3146 | freshest = rdev; | |
3147 | break; | |
3148 | case 0: | |
3149 | break; | |
3150 | default: | |
3151 | printk( KERN_ERR \ | |
3152 | "md: fatal superblock inconsistency in %s" | |
f72ffdd6 | 3153 | " -- removing from array\n", |
1da177e4 LT |
3154 | bdevname(rdev->bdev,b)); |
3155 | kick_rdev_from_array(rdev); | |
3156 | } | |
3157 | ||
1da177e4 LT |
3158 | super_types[mddev->major_version]. |
3159 | validate_super(mddev, freshest); | |
3160 | ||
3161 | i = 0; | |
dafb20fa | 3162 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3163 | if (mddev->max_disks && |
3164 | (rdev->desc_nr >= mddev->max_disks || | |
3165 | i > mddev->max_disks)) { | |
de01dfad N |
3166 | printk(KERN_WARNING |
3167 | "md: %s: %s: only %d devices permitted\n", | |
3168 | mdname(mddev), bdevname(rdev->bdev, b), | |
3169 | mddev->max_disks); | |
3170 | kick_rdev_from_array(rdev); | |
3171 | continue; | |
3172 | } | |
1da177e4 LT |
3173 | if (rdev != freshest) |
3174 | if (super_types[mddev->major_version]. | |
3175 | validate_super(mddev, rdev)) { | |
3176 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3177 | " from array!\n", | |
3178 | bdevname(rdev->bdev,b)); | |
3179 | kick_rdev_from_array(rdev); | |
3180 | continue; | |
3181 | } | |
3182 | if (mddev->level == LEVEL_MULTIPATH) { | |
3183 | rdev->desc_nr = i++; | |
3184 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3185 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3186 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3187 | rdev->raid_disk = -1; |
3188 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3189 | } |
3190 | } | |
1da177e4 LT |
3191 | } |
3192 | ||
72e02075 N |
3193 | /* Read a fixed-point number. |
3194 | * Numbers in sysfs attributes should be in "standard" units where | |
3195 | * possible, so time should be in seconds. | |
f72ffdd6 | 3196 | * However we internally use a a much smaller unit such as |
72e02075 N |
3197 | * milliseconds or jiffies. |
3198 | * This function takes a decimal number with a possible fractional | |
3199 | * component, and produces an integer which is the result of | |
3200 | * multiplying that number by 10^'scale'. | |
3201 | * all without any floating-point arithmetic. | |
3202 | */ | |
3203 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3204 | { | |
3205 | unsigned long result = 0; | |
3206 | long decimals = -1; | |
3207 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3208 | if (*cp == '.') | |
3209 | decimals = 0; | |
3210 | else if (decimals < scale) { | |
3211 | unsigned int value; | |
3212 | value = *cp - '0'; | |
3213 | result = result * 10 + value; | |
3214 | if (decimals >= 0) | |
3215 | decimals++; | |
3216 | } | |
3217 | cp++; | |
3218 | } | |
3219 | if (*cp == '\n') | |
3220 | cp++; | |
3221 | if (*cp) | |
3222 | return -EINVAL; | |
3223 | if (decimals < 0) | |
3224 | decimals = 0; | |
3225 | while (decimals < scale) { | |
3226 | result *= 10; | |
3227 | decimals ++; | |
3228 | } | |
3229 | *res = result; | |
3230 | return 0; | |
3231 | } | |
3232 | ||
19052c0e N |
3233 | static void md_safemode_timeout(unsigned long data); |
3234 | ||
16f17b39 | 3235 | static ssize_t |
fd01b88c | 3236 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3237 | { |
3238 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3239 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3240 | } | |
3241 | static ssize_t | |
fd01b88c | 3242 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3243 | { |
16f17b39 | 3244 | unsigned long msec; |
97ce0a7f | 3245 | |
72e02075 | 3246 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3247 | return -EINVAL; |
16f17b39 N |
3248 | if (msec == 0) |
3249 | mddev->safemode_delay = 0; | |
3250 | else { | |
19052c0e | 3251 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
3252 | mddev->safemode_delay = (msec*HZ)/1000; |
3253 | if (mddev->safemode_delay == 0) | |
3254 | mddev->safemode_delay = 1; | |
275c51c4 | 3255 | if (mddev->safemode_delay < old_delay || old_delay == 0) |
19052c0e | 3256 | md_safemode_timeout((unsigned long)mddev); |
16f17b39 N |
3257 | } |
3258 | return len; | |
3259 | } | |
3260 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3261 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3262 | |
eae1701f | 3263 | static ssize_t |
fd01b88c | 3264 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3265 | { |
84fc4b56 | 3266 | struct md_personality *p = mddev->pers; |
d9d166c2 | 3267 | if (p) |
eae1701f | 3268 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
3269 | else if (mddev->clevel[0]) |
3270 | return sprintf(page, "%s\n", mddev->clevel); | |
3271 | else if (mddev->level != LEVEL_NONE) | |
3272 | return sprintf(page, "%d\n", mddev->level); | |
3273 | else | |
3274 | return 0; | |
eae1701f N |
3275 | } |
3276 | ||
d9d166c2 | 3277 | static ssize_t |
fd01b88c | 3278 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3279 | { |
f2859af6 | 3280 | char clevel[16]; |
20a49ff6 | 3281 | ssize_t rv = len; |
84fc4b56 | 3282 | struct md_personality *pers; |
f2859af6 | 3283 | long level; |
245f46c2 | 3284 | void *priv; |
3cb03002 | 3285 | struct md_rdev *rdev; |
245f46c2 N |
3286 | |
3287 | if (mddev->pers == NULL) { | |
3288 | if (len == 0) | |
3289 | return 0; | |
3290 | if (len >= sizeof(mddev->clevel)) | |
3291 | return -ENOSPC; | |
3292 | strncpy(mddev->clevel, buf, len); | |
3293 | if (mddev->clevel[len-1] == '\n') | |
3294 | len--; | |
3295 | mddev->clevel[len] = 0; | |
3296 | mddev->level = LEVEL_NONE; | |
3297 | return rv; | |
3298 | } | |
bd8839e0 N |
3299 | if (mddev->ro) |
3300 | return -EROFS; | |
245f46c2 N |
3301 | |
3302 | /* request to change the personality. Need to ensure: | |
3303 | * - array is not engaged in resync/recovery/reshape | |
3304 | * - old personality can be suspended | |
3305 | * - new personality will access other array. | |
3306 | */ | |
3307 | ||
bb4f1e9d | 3308 | if (mddev->sync_thread || |
f851b60d | 3309 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3310 | mddev->reshape_position != MaxSector || |
3311 | mddev->sysfs_active) | |
d9d166c2 | 3312 | return -EBUSY; |
245f46c2 N |
3313 | |
3314 | if (!mddev->pers->quiesce) { | |
3315 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3316 | mdname(mddev), mddev->pers->name); | |
3317 | return -EINVAL; | |
3318 | } | |
3319 | ||
3320 | /* Now find the new personality */ | |
f2859af6 | 3321 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3322 | return -EINVAL; |
f2859af6 DW |
3323 | strncpy(clevel, buf, len); |
3324 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3325 | len--; |
f2859af6 | 3326 | clevel[len] = 0; |
b29bebd6 | 3327 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3328 | level = LEVEL_NONE; |
245f46c2 | 3329 | |
f2859af6 DW |
3330 | if (request_module("md-%s", clevel) != 0) |
3331 | request_module("md-level-%s", clevel); | |
245f46c2 | 3332 | spin_lock(&pers_lock); |
f2859af6 | 3333 | pers = find_pers(level, clevel); |
245f46c2 N |
3334 | if (!pers || !try_module_get(pers->owner)) { |
3335 | spin_unlock(&pers_lock); | |
f2859af6 | 3336 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3337 | return -EINVAL; |
3338 | } | |
3339 | spin_unlock(&pers_lock); | |
3340 | ||
3341 | if (pers == mddev->pers) { | |
3342 | /* Nothing to do! */ | |
3343 | module_put(pers->owner); | |
3344 | return rv; | |
3345 | } | |
3346 | if (!pers->takeover) { | |
3347 | module_put(pers->owner); | |
3348 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3349 | mdname(mddev), clevel); |
245f46c2 N |
3350 | return -EINVAL; |
3351 | } | |
3352 | ||
dafb20fa | 3353 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3354 | rdev->new_raid_disk = rdev->raid_disk; |
3355 | ||
245f46c2 N |
3356 | /* ->takeover must set new_* and/or delta_disks |
3357 | * if it succeeds, and may set them when it fails. | |
3358 | */ | |
3359 | priv = pers->takeover(mddev); | |
3360 | if (IS_ERR(priv)) { | |
3361 | mddev->new_level = mddev->level; | |
3362 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3363 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3364 | mddev->raid_disks -= mddev->delta_disks; |
3365 | mddev->delta_disks = 0; | |
2c810cdd | 3366 | mddev->reshape_backwards = 0; |
245f46c2 N |
3367 | module_put(pers->owner); |
3368 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3369 | mdname(mddev), clevel); |
245f46c2 N |
3370 | return PTR_ERR(priv); |
3371 | } | |
3372 | ||
3373 | /* Looks like we have a winner */ | |
3374 | mddev_suspend(mddev); | |
3375 | mddev->pers->stop(mddev); | |
f72ffdd6 | 3376 | |
a64c876f N |
3377 | if (mddev->pers->sync_request == NULL && |
3378 | pers->sync_request != NULL) { | |
3379 | /* need to add the md_redundancy_group */ | |
3380 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3381 | printk(KERN_WARNING | |
3382 | "md: cannot register extra attributes for %s\n", | |
3383 | mdname(mddev)); | |
388975cc | 3384 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3385 | } |
a64c876f N |
3386 | if (mddev->pers->sync_request != NULL && |
3387 | pers->sync_request == NULL) { | |
3388 | /* need to remove the md_redundancy_group */ | |
3389 | if (mddev->to_remove == NULL) | |
3390 | mddev->to_remove = &md_redundancy_group; | |
3391 | } | |
3392 | ||
54071b38 TM |
3393 | if (mddev->pers->sync_request == NULL && |
3394 | mddev->external) { | |
3395 | /* We are converting from a no-redundancy array | |
3396 | * to a redundancy array and metadata is managed | |
3397 | * externally so we need to be sure that writes | |
3398 | * won't block due to a need to transition | |
3399 | * clean->dirty | |
3400 | * until external management is started. | |
3401 | */ | |
3402 | mddev->in_sync = 0; | |
3403 | mddev->safemode_delay = 0; | |
3404 | mddev->safemode = 0; | |
3405 | } | |
3406 | ||
dafb20fa | 3407 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3408 | if (rdev->raid_disk < 0) |
3409 | continue; | |
bf2cb0da | 3410 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3411 | rdev->new_raid_disk = -1; |
3412 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3413 | continue; | |
36fad858 | 3414 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3415 | } |
dafb20fa | 3416 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3417 | if (rdev->raid_disk < 0) |
3418 | continue; | |
3419 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3420 | continue; | |
3421 | rdev->raid_disk = rdev->new_raid_disk; | |
3422 | if (rdev->raid_disk < 0) | |
3a981b03 | 3423 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3424 | else { |
36fad858 NK |
3425 | if (sysfs_link_rdev(mddev, rdev)) |
3426 | printk(KERN_WARNING "md: cannot register rd%d" | |
3427 | " for %s after level change\n", | |
3428 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3429 | } |
e93f68a1 N |
3430 | } |
3431 | ||
3432 | module_put(mddev->pers->owner); | |
245f46c2 N |
3433 | mddev->pers = pers; |
3434 | mddev->private = priv; | |
3435 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3436 | mddev->level = mddev->new_level; | |
3437 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3438 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3439 | mddev->delta_disks = 0; |
2c810cdd | 3440 | mddev->reshape_backwards = 0; |
fee68723 | 3441 | mddev->degraded = 0; |
9af204cf TM |
3442 | if (mddev->pers->sync_request == NULL) { |
3443 | /* this is now an array without redundancy, so | |
3444 | * it must always be in_sync | |
3445 | */ | |
3446 | mddev->in_sync = 1; | |
3447 | del_timer_sync(&mddev->safemode_timer); | |
3448 | } | |
02e5f5c0 | 3449 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3450 | pers->run(mddev); |
245f46c2 | 3451 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3452 | mddev_resume(mddev); |
830778a1 N |
3453 | if (!mddev->thread) |
3454 | md_update_sb(mddev, 1); | |
5cac7861 | 3455 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3456 | md_new_event(mddev); |
d9d166c2 N |
3457 | return rv; |
3458 | } | |
3459 | ||
3460 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3461 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3462 | |
d4dbd025 | 3463 | static ssize_t |
fd01b88c | 3464 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3465 | { |
3466 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3467 | if (mddev->reshape_position != MaxSector && |
3468 | mddev->layout != mddev->new_layout) | |
3469 | return sprintf(page, "%d (%d)\n", | |
3470 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3471 | return sprintf(page, "%d\n", mddev->layout); |
3472 | } | |
3473 | ||
3474 | static ssize_t | |
fd01b88c | 3475 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 N |
3476 | { |
3477 | char *e; | |
3478 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3479 | |
3480 | if (!*buf || (*e && *e != '\n')) | |
3481 | return -EINVAL; | |
3482 | ||
b3546035 N |
3483 | if (mddev->pers) { |
3484 | int err; | |
50ac168a | 3485 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3486 | return -EBUSY; |
bd8839e0 N |
3487 | if (mddev->ro) |
3488 | return -EROFS; | |
597a711b | 3489 | mddev->new_layout = n; |
50ac168a | 3490 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3491 | if (err) { |
3492 | mddev->new_layout = mddev->layout; | |
b3546035 | 3493 | return err; |
597a711b | 3494 | } |
b3546035 | 3495 | } else { |
08a02ecd | 3496 | mddev->new_layout = n; |
b3546035 N |
3497 | if (mddev->reshape_position == MaxSector) |
3498 | mddev->layout = n; | |
3499 | } | |
d4dbd025 N |
3500 | return len; |
3501 | } | |
3502 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3503 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3504 | |
eae1701f | 3505 | static ssize_t |
fd01b88c | 3506 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3507 | { |
bb636547 N |
3508 | if (mddev->raid_disks == 0) |
3509 | return 0; | |
08a02ecd N |
3510 | if (mddev->reshape_position != MaxSector && |
3511 | mddev->delta_disks != 0) | |
3512 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3513 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3514 | return sprintf(page, "%d\n", mddev->raid_disks); |
3515 | } | |
3516 | ||
fd01b88c | 3517 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3518 | |
3519 | static ssize_t | |
fd01b88c | 3520 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3521 | { |
da943b99 N |
3522 | char *e; |
3523 | int rv = 0; | |
3524 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3525 | ||
3526 | if (!*buf || (*e && *e != '\n')) | |
3527 | return -EINVAL; | |
3528 | ||
3529 | if (mddev->pers) | |
3530 | rv = update_raid_disks(mddev, n); | |
08a02ecd | 3531 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3532 | struct md_rdev *rdev; |
08a02ecd | 3533 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c N |
3534 | |
3535 | rdev_for_each(rdev, mddev) { | |
3536 | if (olddisks < n && | |
3537 | rdev->data_offset < rdev->new_data_offset) | |
3538 | return -EINVAL; | |
3539 | if (olddisks > n && | |
3540 | rdev->data_offset > rdev->new_data_offset) | |
3541 | return -EINVAL; | |
3542 | } | |
08a02ecd N |
3543 | mddev->delta_disks = n - olddisks; |
3544 | mddev->raid_disks = n; | |
2c810cdd | 3545 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3546 | } else |
da943b99 N |
3547 | mddev->raid_disks = n; |
3548 | return rv ? rv : len; | |
3549 | } | |
3550 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3551 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3552 | |
3b34380a | 3553 | static ssize_t |
fd01b88c | 3554 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3555 | { |
08a02ecd | 3556 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3557 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3558 | return sprintf(page, "%d (%d)\n", | |
3559 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3560 | mddev->chunk_sectors << 9); |
3561 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3562 | } |
3563 | ||
3564 | static ssize_t | |
fd01b88c | 3565 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3566 | { |
3b34380a N |
3567 | char *e; |
3568 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3569 | ||
3b34380a N |
3570 | if (!*buf || (*e && *e != '\n')) |
3571 | return -EINVAL; | |
3572 | ||
b3546035 N |
3573 | if (mddev->pers) { |
3574 | int err; | |
50ac168a | 3575 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3576 | return -EBUSY; |
bd8839e0 N |
3577 | if (mddev->ro) |
3578 | return -EROFS; | |
597a711b | 3579 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3580 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3581 | if (err) { |
3582 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3583 | return err; |
597a711b | 3584 | } |
b3546035 | 3585 | } else { |
664e7c41 | 3586 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3587 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3588 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3589 | } |
3b34380a N |
3590 | return len; |
3591 | } | |
3592 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3593 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3594 | |
a94213b1 | 3595 | static ssize_t |
fd01b88c | 3596 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3597 | { |
d1a7c503 N |
3598 | if (mddev->recovery_cp == MaxSector) |
3599 | return sprintf(page, "none\n"); | |
a94213b1 N |
3600 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3601 | } | |
3602 | ||
3603 | static ssize_t | |
fd01b88c | 3604 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3605 | { |
a94213b1 N |
3606 | char *e; |
3607 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3608 | ||
b098636c | 3609 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3610 | return -EBUSY; |
06e3c817 DW |
3611 | if (cmd_match(buf, "none")) |
3612 | n = MaxSector; | |
3613 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3614 | return -EINVAL; |
3615 | ||
3616 | mddev->recovery_cp = n; | |
db07d85e N |
3617 | if (mddev->pers) |
3618 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
a94213b1 N |
3619 | return len; |
3620 | } | |
3621 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3622 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3623 | |
9e653b63 N |
3624 | /* |
3625 | * The array state can be: | |
3626 | * | |
3627 | * clear | |
3628 | * No devices, no size, no level | |
3629 | * Equivalent to STOP_ARRAY ioctl | |
3630 | * inactive | |
3631 | * May have some settings, but array is not active | |
3632 | * all IO results in error | |
3633 | * When written, doesn't tear down array, but just stops it | |
3634 | * suspended (not supported yet) | |
3635 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3636 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3637 | * readonly |
3638 | * no resync can happen. no superblocks get written. | |
3639 | * write requests fail | |
3640 | * read-auto | |
3641 | * like readonly, but behaves like 'clean' on a write request. | |
3642 | * | |
3643 | * clean - no pending writes, but otherwise active. | |
3644 | * When written to inactive array, starts without resync | |
3645 | * If a write request arrives then | |
3646 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3647 | * if not known, block and switch to write-pending | |
3648 | * If written to an active array that has pending writes, then fails. | |
3649 | * active | |
3650 | * fully active: IO and resync can be happening. | |
3651 | * When written to inactive array, starts with resync | |
3652 | * | |
3653 | * write-pending | |
3654 | * clean, but writes are blocked waiting for 'active' to be written. | |
3655 | * | |
3656 | * active-idle | |
3657 | * like active, but no writes have been seen for a while (100msec). | |
3658 | * | |
3659 | */ | |
3660 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3661 | write_pending, active_idle, bad_word}; | |
05381954 | 3662 | static char *array_states[] = { |
9e653b63 N |
3663 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3664 | "write-pending", "active-idle", NULL }; | |
3665 | ||
3666 | static int match_word(const char *word, char **list) | |
3667 | { | |
3668 | int n; | |
3669 | for (n=0; list[n]; n++) | |
3670 | if (cmd_match(word, list[n])) | |
3671 | break; | |
3672 | return n; | |
3673 | } | |
3674 | ||
3675 | static ssize_t | |
fd01b88c | 3676 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3677 | { |
3678 | enum array_state st = inactive; | |
3679 | ||
3680 | if (mddev->pers) | |
3681 | switch(mddev->ro) { | |
3682 | case 1: | |
3683 | st = readonly; | |
3684 | break; | |
3685 | case 2: | |
3686 | st = read_auto; | |
3687 | break; | |
3688 | case 0: | |
3689 | if (mddev->in_sync) | |
3690 | st = clean; | |
070dc6dd | 3691 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3692 | st = write_pending; |
9e653b63 N |
3693 | else if (mddev->safemode) |
3694 | st = active_idle; | |
3695 | else | |
3696 | st = active; | |
3697 | } | |
3698 | else { | |
3699 | if (list_empty(&mddev->disks) && | |
3700 | mddev->raid_disks == 0 && | |
58c0fed4 | 3701 | mddev->dev_sectors == 0) |
9e653b63 N |
3702 | st = clear; |
3703 | else | |
3704 | st = inactive; | |
3705 | } | |
3706 | return sprintf(page, "%s\n", array_states[st]); | |
3707 | } | |
3708 | ||
f72ffdd6 N |
3709 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
3710 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
3711 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 3712 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
3713 | |
3714 | static ssize_t | |
fd01b88c | 3715 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 N |
3716 | { |
3717 | int err = -EINVAL; | |
3718 | enum array_state st = match_word(buf, array_states); | |
3719 | switch(st) { | |
3720 | case bad_word: | |
3721 | break; | |
3722 | case clear: | |
3723 | /* stopping an active array */ | |
a05b7ea0 | 3724 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3725 | break; |
3726 | case inactive: | |
3727 | /* stopping an active array */ | |
90cf195d | 3728 | if (mddev->pers) |
a05b7ea0 | 3729 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3730 | else |
e691063a | 3731 | err = 0; /* already inactive */ |
9e653b63 N |
3732 | break; |
3733 | case suspended: | |
3734 | break; /* not supported yet */ | |
3735 | case readonly: | |
3736 | if (mddev->pers) | |
a05b7ea0 | 3737 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3738 | else { |
3739 | mddev->ro = 1; | |
648b629e | 3740 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3741 | err = do_md_run(mddev); |
3742 | } | |
3743 | break; | |
3744 | case read_auto: | |
9e653b63 | 3745 | if (mddev->pers) { |
80268ee9 | 3746 | if (mddev->ro == 0) |
a05b7ea0 | 3747 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3748 | else if (mddev->ro == 1) |
648b629e N |
3749 | err = restart_array(mddev); |
3750 | if (err == 0) { | |
3751 | mddev->ro = 2; | |
3752 | set_disk_ro(mddev->gendisk, 0); | |
3753 | } | |
9e653b63 N |
3754 | } else { |
3755 | mddev->ro = 2; | |
3756 | err = do_md_run(mddev); | |
3757 | } | |
3758 | break; | |
3759 | case clean: | |
3760 | if (mddev->pers) { | |
3761 | restart_array(mddev); | |
85572d7c | 3762 | spin_lock(&mddev->lock); |
9e653b63 | 3763 | if (atomic_read(&mddev->writes_pending) == 0) { |
e691063a N |
3764 | if (mddev->in_sync == 0) { |
3765 | mddev->in_sync = 1; | |
31a59e34 N |
3766 | if (mddev->safemode == 1) |
3767 | mddev->safemode = 0; | |
070dc6dd | 3768 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3769 | } |
3770 | err = 0; | |
3771 | } else | |
3772 | err = -EBUSY; | |
85572d7c | 3773 | spin_unlock(&mddev->lock); |
5bf29597 N |
3774 | } else |
3775 | err = -EINVAL; | |
9e653b63 N |
3776 | break; |
3777 | case active: | |
3778 | if (mddev->pers) { | |
3779 | restart_array(mddev); | |
070dc6dd | 3780 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3781 | wake_up(&mddev->sb_wait); |
3782 | err = 0; | |
3783 | } else { | |
3784 | mddev->ro = 0; | |
648b629e | 3785 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3786 | err = do_md_run(mddev); |
3787 | } | |
3788 | break; | |
3789 | case write_pending: | |
3790 | case active_idle: | |
3791 | /* these cannot be set */ | |
3792 | break; | |
3793 | } | |
3794 | if (err) | |
3795 | return err; | |
0fd62b86 | 3796 | else { |
1d23f178 N |
3797 | if (mddev->hold_active == UNTIL_IOCTL) |
3798 | mddev->hold_active = 0; | |
00bcb4ac | 3799 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3800 | return len; |
0fd62b86 | 3801 | } |
9e653b63 | 3802 | } |
80ca3a44 N |
3803 | static struct md_sysfs_entry md_array_state = |
3804 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3805 | |
1e50915f | 3806 | static ssize_t |
fd01b88c | 3807 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3808 | return sprintf(page, "%d\n", |
3809 | atomic_read(&mddev->max_corr_read_errors)); | |
3810 | } | |
3811 | ||
3812 | static ssize_t | |
fd01b88c | 3813 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f RB |
3814 | { |
3815 | char *e; | |
3816 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3817 | ||
3818 | if (*buf && (*e == 0 || *e == '\n')) { | |
3819 | atomic_set(&mddev->max_corr_read_errors, n); | |
3820 | return len; | |
3821 | } | |
3822 | return -EINVAL; | |
3823 | } | |
3824 | ||
3825 | static struct md_sysfs_entry max_corr_read_errors = | |
3826 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3827 | max_corrected_read_errors_store); | |
3828 | ||
6d7ff738 | 3829 | static ssize_t |
fd01b88c | 3830 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3831 | { |
3832 | return -EINVAL; | |
3833 | } | |
3834 | ||
3835 | static ssize_t | |
fd01b88c | 3836 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
3837 | { |
3838 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3839 | /* The new device is added to the array. | |
3840 | * If the array has a persistent superblock, we read the | |
3841 | * superblock to initialise info and check validity. | |
3842 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3843 | * which mainly checks size. | |
3844 | */ | |
3845 | char *e; | |
3846 | int major = simple_strtoul(buf, &e, 10); | |
3847 | int minor; | |
3848 | dev_t dev; | |
3cb03002 | 3849 | struct md_rdev *rdev; |
6d7ff738 N |
3850 | int err; |
3851 | ||
3852 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3853 | return -EINVAL; | |
3854 | minor = simple_strtoul(e+1, &e, 10); | |
3855 | if (*e && *e != '\n') | |
3856 | return -EINVAL; | |
3857 | dev = MKDEV(major, minor); | |
3858 | if (major != MAJOR(dev) || | |
3859 | minor != MINOR(dev)) | |
3860 | return -EOVERFLOW; | |
3861 | ||
6d7ff738 N |
3862 | if (mddev->persistent) { |
3863 | rdev = md_import_device(dev, mddev->major_version, | |
3864 | mddev->minor_version); | |
3865 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
3866 | struct md_rdev *rdev0 |
3867 | = list_entry(mddev->disks.next, | |
3868 | struct md_rdev, same_set); | |
6d7ff738 N |
3869 | err = super_types[mddev->major_version] |
3870 | .load_super(rdev, rdev0, mddev->minor_version); | |
3871 | if (err < 0) | |
3872 | goto out; | |
3873 | } | |
c5d79adb N |
3874 | } else if (mddev->external) |
3875 | rdev = md_import_device(dev, -2, -1); | |
3876 | else | |
6d7ff738 N |
3877 | rdev = md_import_device(dev, -1, -1); |
3878 | ||
3879 | if (IS_ERR(rdev)) | |
3880 | return PTR_ERR(rdev); | |
3881 | err = bind_rdev_to_array(rdev, mddev); | |
3882 | out: | |
3883 | if (err) | |
3884 | export_rdev(rdev); | |
3885 | return err ? err : len; | |
3886 | } | |
3887 | ||
3888 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3889 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3890 | |
9b1d1dac | 3891 | static ssize_t |
fd01b88c | 3892 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
3893 | { |
3894 | char *end; | |
3895 | unsigned long chunk, end_chunk; | |
3896 | ||
3897 | if (!mddev->bitmap) | |
3898 | goto out; | |
3899 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3900 | while (*buf) { | |
3901 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3902 | if (buf == end) break; | |
3903 | if (*end == '-') { /* range */ | |
3904 | buf = end + 1; | |
3905 | end_chunk = simple_strtoul(buf, &end, 0); | |
3906 | if (buf == end) break; | |
3907 | } | |
3908 | if (*end && !isspace(*end)) break; | |
3909 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3910 | buf = skip_spaces(end); |
9b1d1dac PC |
3911 | } |
3912 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3913 | out: | |
3914 | return len; | |
3915 | } | |
3916 | ||
3917 | static struct md_sysfs_entry md_bitmap = | |
3918 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3919 | ||
a35b0d69 | 3920 | static ssize_t |
fd01b88c | 3921 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 3922 | { |
58c0fed4 AN |
3923 | return sprintf(page, "%llu\n", |
3924 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3925 | } |
3926 | ||
fd01b88c | 3927 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
3928 | |
3929 | static ssize_t | |
fd01b88c | 3930 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
3931 | { |
3932 | /* If array is inactive, we can reduce the component size, but | |
3933 | * not increase it (except from 0). | |
3934 | * If array is active, we can try an on-line resize | |
3935 | */ | |
b522adcd DW |
3936 | sector_t sectors; |
3937 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3938 | |
58c0fed4 AN |
3939 | if (err < 0) |
3940 | return err; | |
a35b0d69 | 3941 | if (mddev->pers) { |
58c0fed4 | 3942 | err = update_size(mddev, sectors); |
850b2b42 | 3943 | md_update_sb(mddev, 1); |
a35b0d69 | 3944 | } else { |
58c0fed4 AN |
3945 | if (mddev->dev_sectors == 0 || |
3946 | mddev->dev_sectors > sectors) | |
3947 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3948 | else |
3949 | err = -ENOSPC; | |
3950 | } | |
3951 | return err ? err : len; | |
3952 | } | |
3953 | ||
3954 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3955 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3956 | |
83f0d77a | 3957 | /* Metadata version. |
e691063a N |
3958 | * This is one of |
3959 | * 'none' for arrays with no metadata (good luck...) | |
3960 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3961 | * or N.M for internally known formats |
3962 | */ | |
3963 | static ssize_t | |
fd01b88c | 3964 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
3965 | { |
3966 | if (mddev->persistent) | |
3967 | return sprintf(page, "%d.%d\n", | |
3968 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3969 | else if (mddev->external) |
3970 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3971 | else |
3972 | return sprintf(page, "none\n"); | |
3973 | } | |
3974 | ||
3975 | static ssize_t | |
fd01b88c | 3976 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
3977 | { |
3978 | int major, minor; | |
3979 | char *e; | |
ea43ddd8 N |
3980 | /* Changing the details of 'external' metadata is |
3981 | * always permitted. Otherwise there must be | |
3982 | * no devices attached to the array. | |
3983 | */ | |
3984 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3985 | ; | |
3986 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3987 | return -EBUSY; |
3988 | ||
3989 | if (cmd_match(buf, "none")) { | |
3990 | mddev->persistent = 0; | |
e691063a N |
3991 | mddev->external = 0; |
3992 | mddev->major_version = 0; | |
3993 | mddev->minor_version = 90; | |
3994 | return len; | |
3995 | } | |
3996 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3997 | size_t namelen = len-9; |
e691063a N |
3998 | if (namelen >= sizeof(mddev->metadata_type)) |
3999 | namelen = sizeof(mddev->metadata_type)-1; | |
4000 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4001 | mddev->metadata_type[namelen] = 0; | |
4002 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4003 | mddev->metadata_type[--namelen] = 0; | |
4004 | mddev->persistent = 0; | |
4005 | mddev->external = 1; | |
8bb93aac N |
4006 | mddev->major_version = 0; |
4007 | mddev->minor_version = 90; | |
4008 | return len; | |
4009 | } | |
4010 | major = simple_strtoul(buf, &e, 10); | |
4011 | if (e==buf || *e != '.') | |
4012 | return -EINVAL; | |
4013 | buf = e+1; | |
4014 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4015 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 4016 | return -EINVAL; |
50511da3 | 4017 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
4018 | return -ENOENT; |
4019 | mddev->major_version = major; | |
4020 | mddev->minor_version = minor; | |
4021 | mddev->persistent = 1; | |
e691063a | 4022 | mddev->external = 0; |
8bb93aac N |
4023 | return len; |
4024 | } | |
4025 | ||
4026 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 4027 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4028 | |
24dd469d | 4029 | static ssize_t |
fd01b88c | 4030 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4031 | { |
7eec314d | 4032 | char *type = "idle"; |
b6a9ce68 N |
4033 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
4034 | type = "frozen"; | |
4035 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 4036 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
4037 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4038 | type = "reshape"; | |
4039 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
4040 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
4041 | type = "resync"; | |
4042 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
4043 | type = "check"; | |
4044 | else | |
4045 | type = "repair"; | |
72a23c21 | 4046 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
4047 | type = "recover"; |
4048 | } | |
4049 | return sprintf(page, "%s\n", type); | |
4050 | } | |
4051 | ||
4052 | static ssize_t | |
fd01b88c | 4053 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4054 | { |
7eec314d N |
4055 | if (!mddev->pers || !mddev->pers->sync_request) |
4056 | return -EINVAL; | |
4057 | ||
b6a9ce68 N |
4058 | if (cmd_match(page, "frozen")) |
4059 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4060 | else | |
4061 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4062 | ||
4063 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
f851b60d | 4064 | flush_workqueue(md_misc_wq); |
7eec314d N |
4065 | if (mddev->sync_thread) { |
4066 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
a91d5ac0 | 4067 | md_reap_sync_thread(mddev); |
7eec314d | 4068 | } |
03c902e1 N |
4069 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4070 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4071 | return -EBUSY; |
72a23c21 NB |
4072 | else if (cmd_match(page, "resync")) |
4073 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4074 | else if (cmd_match(page, "recover")) { | |
4075 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4076 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4077 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4078 | int err; |
4079 | if (mddev->pers->start_reshape == NULL) | |
4080 | return -EINVAL; | |
4081 | err = mddev->pers->start_reshape(mddev); | |
4082 | if (err) | |
4083 | return err; | |
a99ac971 | 4084 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4085 | } else { |
bce74dac | 4086 | if (cmd_match(page, "check")) |
7eec314d | 4087 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4088 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4089 | return -EINVAL; |
4090 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4091 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4092 | } |
48c26ddc N |
4093 | if (mddev->ro == 2) { |
4094 | /* A write to sync_action is enough to justify | |
4095 | * canceling read-auto mode | |
4096 | */ | |
4097 | mddev->ro = 0; | |
4098 | md_wakeup_thread(mddev->sync_thread); | |
4099 | } | |
03c902e1 | 4100 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4101 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4102 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4103 | return len; |
4104 | } | |
4105 | ||
c4a39551 JB |
4106 | static struct md_sysfs_entry md_scan_mode = |
4107 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
4108 | ||
4109 | static ssize_t | |
4110 | last_sync_action_show(struct mddev *mddev, char *page) | |
4111 | { | |
4112 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4113 | } | |
4114 | ||
4115 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4116 | ||
9d88883e | 4117 | static ssize_t |
fd01b88c | 4118 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4119 | { |
4120 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4121 | (unsigned long long) |
4122 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4123 | } |
4124 | ||
80ca3a44 | 4125 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4126 | |
88202a0c | 4127 | static ssize_t |
fd01b88c | 4128 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4129 | { |
4130 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4131 | mddev->sync_speed_min ? "local": "system"); | |
4132 | } | |
4133 | ||
4134 | static ssize_t | |
fd01b88c | 4135 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4136 | { |
4137 | int min; | |
4138 | char *e; | |
4139 | if (strncmp(buf, "system", 6)==0) { | |
4140 | mddev->sync_speed_min = 0; | |
4141 | return len; | |
4142 | } | |
4143 | min = simple_strtoul(buf, &e, 10); | |
4144 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4145 | return -EINVAL; | |
4146 | mddev->sync_speed_min = min; | |
4147 | return len; | |
4148 | } | |
4149 | ||
4150 | static struct md_sysfs_entry md_sync_min = | |
4151 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4152 | ||
4153 | static ssize_t | |
fd01b88c | 4154 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4155 | { |
4156 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4157 | mddev->sync_speed_max ? "local": "system"); | |
4158 | } | |
4159 | ||
4160 | static ssize_t | |
fd01b88c | 4161 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4162 | { |
4163 | int max; | |
4164 | char *e; | |
4165 | if (strncmp(buf, "system", 6)==0) { | |
4166 | mddev->sync_speed_max = 0; | |
4167 | return len; | |
4168 | } | |
4169 | max = simple_strtoul(buf, &e, 10); | |
4170 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4171 | return -EINVAL; | |
4172 | mddev->sync_speed_max = max; | |
4173 | return len; | |
4174 | } | |
4175 | ||
4176 | static struct md_sysfs_entry md_sync_max = | |
4177 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4178 | ||
d7f3d291 | 4179 | static ssize_t |
fd01b88c | 4180 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4181 | { |
4182 | return sprintf(page, "%d\n", mddev->degraded); | |
4183 | } | |
4184 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4185 | |
90b08710 | 4186 | static ssize_t |
fd01b88c | 4187 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4188 | { |
4189 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4190 | } | |
4191 | ||
4192 | static ssize_t | |
fd01b88c | 4193 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4194 | { |
4195 | long n; | |
4196 | ||
b29bebd6 | 4197 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4198 | return -EINVAL; |
4199 | ||
4200 | if (n != 0 && n != 1) | |
4201 | return -EINVAL; | |
4202 | ||
4203 | mddev->parallel_resync = n; | |
4204 | ||
4205 | if (mddev->sync_thread) | |
4206 | wake_up(&resync_wait); | |
4207 | ||
4208 | return len; | |
4209 | } | |
4210 | ||
4211 | /* force parallel resync, even with shared block devices */ | |
4212 | static struct md_sysfs_entry md_sync_force_parallel = | |
4213 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4214 | sync_force_parallel_show, sync_force_parallel_store); | |
4215 | ||
88202a0c | 4216 | static ssize_t |
fd01b88c | 4217 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4218 | { |
4219 | unsigned long resync, dt, db; | |
d1a7c503 N |
4220 | if (mddev->curr_resync == 0) |
4221 | return sprintf(page, "none\n"); | |
9687a60c AN |
4222 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4223 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4224 | if (!dt) dt++; |
9687a60c AN |
4225 | db = resync - mddev->resync_mark_cnt; |
4226 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4227 | } |
4228 | ||
80ca3a44 | 4229 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4230 | |
4231 | static ssize_t | |
fd01b88c | 4232 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4233 | { |
13ae864b | 4234 | unsigned long long max_sectors, resync; |
88202a0c | 4235 | |
acb180b0 N |
4236 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4237 | return sprintf(page, "none\n"); | |
4238 | ||
72f36d59 N |
4239 | if (mddev->curr_resync == 1 || |
4240 | mddev->curr_resync == 2) | |
4241 | return sprintf(page, "delayed\n"); | |
4242 | ||
c804cdec N |
4243 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4244 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4245 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4246 | else |
58c0fed4 | 4247 | max_sectors = mddev->dev_sectors; |
88202a0c | 4248 | |
acb180b0 | 4249 | resync = mddev->curr_resync_completed; |
13ae864b | 4250 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4251 | } |
4252 | ||
80ca3a44 | 4253 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4254 | |
5e96ee65 | 4255 | static ssize_t |
fd01b88c | 4256 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4257 | { |
4258 | return sprintf(page, "%llu\n", | |
4259 | (unsigned long long)mddev->resync_min); | |
4260 | } | |
4261 | static ssize_t | |
fd01b88c | 4262 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4263 | { |
4264 | unsigned long long min; | |
b29bebd6 | 4265 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 NB |
4266 | return -EINVAL; |
4267 | if (min > mddev->resync_max) | |
4268 | return -EINVAL; | |
4269 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4270 | return -EBUSY; | |
4271 | ||
4272 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4273 | if (mddev->chunk_sectors) { |
2ac06c33 | 4274 | sector_t temp = min; |
9d8f0363 | 4275 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4276 | return -EINVAL; |
4277 | } | |
4278 | mddev->resync_min = min; | |
4279 | ||
4280 | return len; | |
4281 | } | |
4282 | ||
4283 | static struct md_sysfs_entry md_min_sync = | |
4284 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4285 | ||
c6207277 | 4286 | static ssize_t |
fd01b88c | 4287 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4288 | { |
4289 | if (mddev->resync_max == MaxSector) | |
4290 | return sprintf(page, "max\n"); | |
4291 | else | |
4292 | return sprintf(page, "%llu\n", | |
4293 | (unsigned long long)mddev->resync_max); | |
4294 | } | |
4295 | static ssize_t | |
fd01b88c | 4296 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 N |
4297 | { |
4298 | if (strncmp(buf, "max", 3) == 0) | |
4299 | mddev->resync_max = MaxSector; | |
4300 | else { | |
5e96ee65 | 4301 | unsigned long long max; |
b29bebd6 | 4302 | if (kstrtoull(buf, 10, &max)) |
5e96ee65 NB |
4303 | return -EINVAL; |
4304 | if (max < mddev->resync_min) | |
c6207277 N |
4305 | return -EINVAL; |
4306 | if (max < mddev->resync_max && | |
4d484a4a | 4307 | mddev->ro == 0 && |
c6207277 N |
4308 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4309 | return -EBUSY; | |
4310 | ||
4311 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4312 | if (mddev->chunk_sectors) { |
2ac06c33 | 4313 | sector_t temp = max; |
9d8f0363 | 4314 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4315 | return -EINVAL; |
4316 | } | |
4317 | mddev->resync_max = max; | |
4318 | } | |
4319 | wake_up(&mddev->recovery_wait); | |
4320 | return len; | |
4321 | } | |
4322 | ||
4323 | static struct md_sysfs_entry md_max_sync = | |
4324 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4325 | ||
e464eafd | 4326 | static ssize_t |
fd01b88c | 4327 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4328 | { |
4329 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4330 | } | |
4331 | ||
4332 | static ssize_t | |
fd01b88c | 4333 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4334 | { |
4335 | char *e; | |
4336 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4337 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4338 | |
f72ffdd6 | 4339 | if (mddev->pers == NULL || |
b8d966ef | 4340 | mddev->pers->quiesce == NULL) |
e464eafd N |
4341 | return -EINVAL; |
4342 | if (buf == e || (*e && *e != '\n')) | |
4343 | return -EINVAL; | |
23ddff37 N |
4344 | |
4345 | mddev->suspend_lo = new; | |
4346 | if (new >= old) | |
4347 | /* Shrinking suspended region */ | |
e464eafd | 4348 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4349 | else { |
4350 | /* Expanding suspended region - need to wait */ | |
4351 | mddev->pers->quiesce(mddev, 1); | |
4352 | mddev->pers->quiesce(mddev, 0); | |
4353 | } | |
4354 | return len; | |
e464eafd N |
4355 | } |
4356 | static struct md_sysfs_entry md_suspend_lo = | |
4357 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4358 | ||
e464eafd | 4359 | static ssize_t |
fd01b88c | 4360 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4361 | { |
4362 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4363 | } | |
4364 | ||
4365 | static ssize_t | |
fd01b88c | 4366 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4367 | { |
4368 | char *e; | |
4369 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4370 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4371 | |
b8d966ef N |
4372 | if (mddev->pers == NULL || |
4373 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4374 | return -EINVAL; |
4375 | if (buf == e || (*e && *e != '\n')) | |
4376 | return -EINVAL; | |
23ddff37 N |
4377 | |
4378 | mddev->suspend_hi = new; | |
4379 | if (new <= old) | |
4380 | /* Shrinking suspended region */ | |
4381 | mddev->pers->quiesce(mddev, 2); | |
4382 | else { | |
4383 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4384 | mddev->pers->quiesce(mddev, 1); |
4385 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4386 | } |
4387 | return len; | |
e464eafd N |
4388 | } |
4389 | static struct md_sysfs_entry md_suspend_hi = | |
4390 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4391 | ||
08a02ecd | 4392 | static ssize_t |
fd01b88c | 4393 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4394 | { |
4395 | if (mddev->reshape_position != MaxSector) | |
4396 | return sprintf(page, "%llu\n", | |
4397 | (unsigned long long)mddev->reshape_position); | |
4398 | strcpy(page, "none\n"); | |
4399 | return 5; | |
4400 | } | |
4401 | ||
4402 | static ssize_t | |
fd01b88c | 4403 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4404 | { |
c6563a8c | 4405 | struct md_rdev *rdev; |
08a02ecd N |
4406 | char *e; |
4407 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4408 | if (mddev->pers) | |
4409 | return -EBUSY; | |
4410 | if (buf == e || (*e && *e != '\n')) | |
4411 | return -EINVAL; | |
4412 | mddev->reshape_position = new; | |
4413 | mddev->delta_disks = 0; | |
2c810cdd | 4414 | mddev->reshape_backwards = 0; |
08a02ecd N |
4415 | mddev->new_level = mddev->level; |
4416 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4417 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4418 | rdev_for_each(rdev, mddev) |
4419 | rdev->new_data_offset = rdev->data_offset; | |
08a02ecd N |
4420 | return len; |
4421 | } | |
4422 | ||
4423 | static struct md_sysfs_entry md_reshape_position = | |
4424 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4425 | reshape_position_store); | |
4426 | ||
2c810cdd N |
4427 | static ssize_t |
4428 | reshape_direction_show(struct mddev *mddev, char *page) | |
4429 | { | |
4430 | return sprintf(page, "%s\n", | |
4431 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4432 | } | |
4433 | ||
4434 | static ssize_t | |
4435 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4436 | { | |
4437 | int backwards = 0; | |
4438 | if (cmd_match(buf, "forwards")) | |
4439 | backwards = 0; | |
4440 | else if (cmd_match(buf, "backwards")) | |
4441 | backwards = 1; | |
4442 | else | |
4443 | return -EINVAL; | |
4444 | if (mddev->reshape_backwards == backwards) | |
4445 | return len; | |
4446 | ||
4447 | /* check if we are allowed to change */ | |
4448 | if (mddev->delta_disks) | |
4449 | return -EBUSY; | |
4450 | ||
4451 | if (mddev->persistent && | |
4452 | mddev->major_version == 0) | |
4453 | return -EINVAL; | |
4454 | ||
4455 | mddev->reshape_backwards = backwards; | |
4456 | return len; | |
4457 | } | |
4458 | ||
4459 | static struct md_sysfs_entry md_reshape_direction = | |
4460 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4461 | reshape_direction_store); | |
4462 | ||
b522adcd | 4463 | static ssize_t |
fd01b88c | 4464 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4465 | { |
4466 | if (mddev->external_size) | |
4467 | return sprintf(page, "%llu\n", | |
4468 | (unsigned long long)mddev->array_sectors/2); | |
4469 | else | |
4470 | return sprintf(page, "default\n"); | |
4471 | } | |
4472 | ||
4473 | static ssize_t | |
fd01b88c | 4474 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4475 | { |
4476 | sector_t sectors; | |
4477 | ||
4478 | if (strncmp(buf, "default", 7) == 0) { | |
4479 | if (mddev->pers) | |
4480 | sectors = mddev->pers->size(mddev, 0, 0); | |
4481 | else | |
4482 | sectors = mddev->array_sectors; | |
4483 | ||
4484 | mddev->external_size = 0; | |
4485 | } else { | |
4486 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4487 | return -EINVAL; | |
4488 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4489 | return -E2BIG; |
b522adcd DW |
4490 | |
4491 | mddev->external_size = 1; | |
4492 | } | |
4493 | ||
4494 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4495 | if (mddev->pers) { |
4496 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4497 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4498 | } |
b522adcd DW |
4499 | return len; |
4500 | } | |
4501 | ||
4502 | static struct md_sysfs_entry md_array_size = | |
4503 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4504 | array_size_store); | |
e464eafd | 4505 | |
eae1701f N |
4506 | static struct attribute *md_default_attrs[] = { |
4507 | &md_level.attr, | |
d4dbd025 | 4508 | &md_layout.attr, |
eae1701f | 4509 | &md_raid_disks.attr, |
3b34380a | 4510 | &md_chunk_size.attr, |
a35b0d69 | 4511 | &md_size.attr, |
a94213b1 | 4512 | &md_resync_start.attr, |
8bb93aac | 4513 | &md_metadata.attr, |
6d7ff738 | 4514 | &md_new_device.attr, |
16f17b39 | 4515 | &md_safe_delay.attr, |
9e653b63 | 4516 | &md_array_state.attr, |
08a02ecd | 4517 | &md_reshape_position.attr, |
2c810cdd | 4518 | &md_reshape_direction.attr, |
b522adcd | 4519 | &md_array_size.attr, |
1e50915f | 4520 | &max_corr_read_errors.attr, |
411036fa N |
4521 | NULL, |
4522 | }; | |
4523 | ||
4524 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4525 | &md_scan_mode.attr, |
c4a39551 | 4526 | &md_last_scan_mode.attr, |
9d88883e | 4527 | &md_mismatches.attr, |
88202a0c N |
4528 | &md_sync_min.attr, |
4529 | &md_sync_max.attr, | |
4530 | &md_sync_speed.attr, | |
90b08710 | 4531 | &md_sync_force_parallel.attr, |
88202a0c | 4532 | &md_sync_completed.attr, |
5e96ee65 | 4533 | &md_min_sync.attr, |
c6207277 | 4534 | &md_max_sync.attr, |
e464eafd N |
4535 | &md_suspend_lo.attr, |
4536 | &md_suspend_hi.attr, | |
9b1d1dac | 4537 | &md_bitmap.attr, |
d7f3d291 | 4538 | &md_degraded.attr, |
eae1701f N |
4539 | NULL, |
4540 | }; | |
411036fa N |
4541 | static struct attribute_group md_redundancy_group = { |
4542 | .name = NULL, | |
4543 | .attrs = md_redundancy_attrs, | |
4544 | }; | |
4545 | ||
eae1701f N |
4546 | static ssize_t |
4547 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4548 | { | |
4549 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4550 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4551 | ssize_t rv; |
eae1701f N |
4552 | |
4553 | if (!entry->show) | |
4554 | return -EIO; | |
af8a2434 N |
4555 | spin_lock(&all_mddevs_lock); |
4556 | if (list_empty(&mddev->all_mddevs)) { | |
4557 | spin_unlock(&all_mddevs_lock); | |
4558 | return -EBUSY; | |
4559 | } | |
4560 | mddev_get(mddev); | |
4561 | spin_unlock(&all_mddevs_lock); | |
4562 | ||
5dc5cf7d IM |
4563 | rv = mddev_lock(mddev); |
4564 | if (!rv) { | |
4565 | rv = entry->show(mddev, page); | |
4566 | mddev_unlock(mddev); | |
4567 | } | |
af8a2434 | 4568 | mddev_put(mddev); |
96de1e66 | 4569 | return rv; |
eae1701f N |
4570 | } |
4571 | ||
4572 | static ssize_t | |
4573 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4574 | const char *page, size_t length) | |
4575 | { | |
4576 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4577 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4578 | ssize_t rv; |
eae1701f N |
4579 | |
4580 | if (!entry->store) | |
4581 | return -EIO; | |
67463acb N |
4582 | if (!capable(CAP_SYS_ADMIN)) |
4583 | return -EACCES; | |
af8a2434 N |
4584 | spin_lock(&all_mddevs_lock); |
4585 | if (list_empty(&mddev->all_mddevs)) { | |
4586 | spin_unlock(&all_mddevs_lock); | |
4587 | return -EBUSY; | |
4588 | } | |
4589 | mddev_get(mddev); | |
4590 | spin_unlock(&all_mddevs_lock); | |
a7a3f08d N |
4591 | if (entry->store == new_dev_store) |
4592 | flush_workqueue(md_misc_wq); | |
5dc5cf7d IM |
4593 | rv = mddev_lock(mddev); |
4594 | if (!rv) { | |
4595 | rv = entry->store(mddev, page, length); | |
4596 | mddev_unlock(mddev); | |
4597 | } | |
af8a2434 | 4598 | mddev_put(mddev); |
96de1e66 | 4599 | return rv; |
eae1701f N |
4600 | } |
4601 | ||
4602 | static void md_free(struct kobject *ko) | |
4603 | { | |
fd01b88c | 4604 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4605 | |
4606 | if (mddev->sysfs_state) | |
4607 | sysfs_put(mddev->sysfs_state); | |
4608 | ||
4609 | if (mddev->gendisk) { | |
4610 | del_gendisk(mddev->gendisk); | |
4611 | put_disk(mddev->gendisk); | |
4612 | } | |
4613 | if (mddev->queue) | |
4614 | blk_cleanup_queue(mddev->queue); | |
4615 | ||
eae1701f N |
4616 | kfree(mddev); |
4617 | } | |
4618 | ||
52cf25d0 | 4619 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4620 | .show = md_attr_show, |
4621 | .store = md_attr_store, | |
4622 | }; | |
4623 | static struct kobj_type md_ktype = { | |
4624 | .release = md_free, | |
4625 | .sysfs_ops = &md_sysfs_ops, | |
4626 | .default_attrs = md_default_attrs, | |
4627 | }; | |
4628 | ||
1da177e4 LT |
4629 | int mdp_major = 0; |
4630 | ||
5fd3a17e DW |
4631 | static void mddev_delayed_delete(struct work_struct *ws) |
4632 | { | |
fd01b88c | 4633 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4634 | |
43a70507 | 4635 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4636 | kobject_del(&mddev->kobj); |
4637 | kobject_put(&mddev->kobj); | |
4638 | } | |
4639 | ||
efeb53c0 | 4640 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4641 | { |
48c9c27b | 4642 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4643 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4644 | struct gendisk *disk; |
efeb53c0 N |
4645 | int partitioned; |
4646 | int shift; | |
4647 | int unit; | |
3830c62f | 4648 | int error; |
1da177e4 LT |
4649 | |
4650 | if (!mddev) | |
efeb53c0 N |
4651 | return -ENODEV; |
4652 | ||
4653 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4654 | shift = partitioned ? MdpMinorShift : 0; | |
4655 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4656 | |
e804ac78 TH |
4657 | /* wait for any previous instance of this device to be |
4658 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4659 | */ |
e804ac78 | 4660 | flush_workqueue(md_misc_wq); |
d3374825 | 4661 | |
48c9c27b | 4662 | mutex_lock(&disks_mutex); |
0909dc44 N |
4663 | error = -EEXIST; |
4664 | if (mddev->gendisk) | |
4665 | goto abort; | |
efeb53c0 N |
4666 | |
4667 | if (name) { | |
4668 | /* Need to ensure that 'name' is not a duplicate. | |
4669 | */ | |
fd01b88c | 4670 | struct mddev *mddev2; |
efeb53c0 N |
4671 | spin_lock(&all_mddevs_lock); |
4672 | ||
4673 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4674 | if (mddev2->gendisk && | |
4675 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4676 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4677 | goto abort; |
efeb53c0 N |
4678 | } |
4679 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4680 | } |
8b765398 | 4681 | |
0909dc44 | 4682 | error = -ENOMEM; |
8b765398 | 4683 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4684 | if (!mddev->queue) |
4685 | goto abort; | |
409c57f3 N |
4686 | mddev->queue->queuedata = mddev; |
4687 | ||
409c57f3 | 4688 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 4689 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 4690 | |
1da177e4 LT |
4691 | disk = alloc_disk(1 << shift); |
4692 | if (!disk) { | |
8b765398 N |
4693 | blk_cleanup_queue(mddev->queue); |
4694 | mddev->queue = NULL; | |
0909dc44 | 4695 | goto abort; |
1da177e4 | 4696 | } |
efeb53c0 | 4697 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4698 | disk->first_minor = unit << shift; |
efeb53c0 N |
4699 | if (name) |
4700 | strcpy(disk->disk_name, name); | |
4701 | else if (partitioned) | |
1da177e4 | 4702 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4703 | else |
1da177e4 | 4704 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4705 | disk->fops = &md_fops; |
4706 | disk->private_data = mddev; | |
4707 | disk->queue = mddev->queue; | |
b0140891 | 4708 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4709 | /* Allow extended partitions. This makes the |
d3374825 | 4710 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4711 | * remove it now. |
4712 | */ | |
4713 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4714 | mddev->gendisk = disk; |
b0140891 N |
4715 | /* As soon as we call add_disk(), another thread could get |
4716 | * through to md_open, so make sure it doesn't get too far | |
4717 | */ | |
4718 | mutex_lock(&mddev->open_mutex); | |
4719 | add_disk(disk); | |
4720 | ||
ed9e1982 TH |
4721 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4722 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4723 | if (error) { |
4724 | /* This isn't possible, but as kobject_init_and_add is marked | |
4725 | * __must_check, we must do something with the result | |
4726 | */ | |
5e55e2f5 N |
4727 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4728 | disk->disk_name); | |
0909dc44 N |
4729 | error = 0; |
4730 | } | |
00bcb4ac N |
4731 | if (mddev->kobj.sd && |
4732 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4733 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4734 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4735 | abort: |
4736 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4737 | if (!error && mddev->kobj.sd) { |
3830c62f | 4738 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4739 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4740 | } |
d3374825 | 4741 | mddev_put(mddev); |
0909dc44 | 4742 | return error; |
efeb53c0 N |
4743 | } |
4744 | ||
4745 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4746 | { | |
4747 | md_alloc(dev, NULL); | |
1da177e4 LT |
4748 | return NULL; |
4749 | } | |
4750 | ||
efeb53c0 N |
4751 | static int add_named_array(const char *val, struct kernel_param *kp) |
4752 | { | |
4753 | /* val must be "md_*" where * is not all digits. | |
4754 | * We allocate an array with a large free minor number, and | |
4755 | * set the name to val. val must not already be an active name. | |
4756 | */ | |
4757 | int len = strlen(val); | |
4758 | char buf[DISK_NAME_LEN]; | |
4759 | ||
4760 | while (len && val[len-1] == '\n') | |
4761 | len--; | |
4762 | if (len >= DISK_NAME_LEN) | |
4763 | return -E2BIG; | |
4764 | strlcpy(buf, val, len+1); | |
4765 | if (strncmp(buf, "md_", 3) != 0) | |
4766 | return -EINVAL; | |
4767 | return md_alloc(0, buf); | |
4768 | } | |
4769 | ||
1da177e4 LT |
4770 | static void md_safemode_timeout(unsigned long data) |
4771 | { | |
fd01b88c | 4772 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 4773 | |
0fd62b86 NB |
4774 | if (!atomic_read(&mddev->writes_pending)) { |
4775 | mddev->safemode = 1; | |
4776 | if (mddev->external) | |
00bcb4ac | 4777 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4778 | } |
1da177e4 LT |
4779 | md_wakeup_thread(mddev->thread); |
4780 | } | |
4781 | ||
6ff8d8ec | 4782 | static int start_dirty_degraded; |
1da177e4 | 4783 | |
fd01b88c | 4784 | int md_run(struct mddev *mddev) |
1da177e4 | 4785 | { |
2604b703 | 4786 | int err; |
3cb03002 | 4787 | struct md_rdev *rdev; |
84fc4b56 | 4788 | struct md_personality *pers; |
1da177e4 | 4789 | |
a757e64c N |
4790 | if (list_empty(&mddev->disks)) |
4791 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4792 | return -EINVAL; |
1da177e4 LT |
4793 | |
4794 | if (mddev->pers) | |
4795 | return -EBUSY; | |
bb4f1e9d N |
4796 | /* Cannot run until previous stop completes properly */ |
4797 | if (mddev->sysfs_active) | |
4798 | return -EBUSY; | |
b6eb127d | 4799 | |
1da177e4 LT |
4800 | /* |
4801 | * Analyze all RAID superblock(s) | |
4802 | */ | |
1ec4a939 N |
4803 | if (!mddev->raid_disks) { |
4804 | if (!mddev->persistent) | |
4805 | return -EINVAL; | |
a757e64c | 4806 | analyze_sbs(mddev); |
1ec4a939 | 4807 | } |
1da177e4 | 4808 | |
d9d166c2 N |
4809 | if (mddev->level != LEVEL_NONE) |
4810 | request_module("md-level-%d", mddev->level); | |
4811 | else if (mddev->clevel[0]) | |
4812 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4813 | |
4814 | /* | |
4815 | * Drop all container device buffers, from now on | |
4816 | * the only valid external interface is through the md | |
4817 | * device. | |
1da177e4 | 4818 | */ |
dafb20fa | 4819 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 4820 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4821 | continue; |
4822 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4823 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4824 | |
4825 | /* perform some consistency tests on the device. | |
4826 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4827 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4828 | */ |
a6ff7e08 JB |
4829 | if (rdev->meta_bdev) { |
4830 | /* Nothing to check */; | |
4831 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4832 | if (mddev->dev_sectors && |
4833 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4834 | > rdev->sb_start) { |
f0d76d70 N |
4835 | printk("md: %s: data overlaps metadata\n", |
4836 | mdname(mddev)); | |
4837 | return -EINVAL; | |
4838 | } | |
4839 | } else { | |
0f420358 | 4840 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4841 | > rdev->data_offset) { |
4842 | printk("md: %s: metadata overlaps data\n", | |
4843 | mdname(mddev)); | |
4844 | return -EINVAL; | |
4845 | } | |
4846 | } | |
00bcb4ac | 4847 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4848 | } |
4849 | ||
a167f663 | 4850 | if (mddev->bio_set == NULL) |
395c72a7 | 4851 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 4852 | |
1da177e4 | 4853 | spin_lock(&pers_lock); |
d9d166c2 | 4854 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4855 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4856 | spin_unlock(&pers_lock); |
d9d166c2 N |
4857 | if (mddev->level != LEVEL_NONE) |
4858 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4859 | mddev->level); | |
4860 | else | |
4861 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4862 | mddev->clevel); | |
1da177e4 LT |
4863 | return -EINVAL; |
4864 | } | |
2604b703 | 4865 | mddev->pers = pers; |
1da177e4 | 4866 | spin_unlock(&pers_lock); |
34817e8c N |
4867 | if (mddev->level != pers->level) { |
4868 | mddev->level = pers->level; | |
4869 | mddev->new_level = pers->level; | |
4870 | } | |
d9d166c2 | 4871 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4872 | |
f6705578 | 4873 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4874 | pers->start_reshape == NULL) { |
f6705578 N |
4875 | /* This personality cannot handle reshaping... */ |
4876 | mddev->pers = NULL; | |
4877 | module_put(pers->owner); | |
4878 | return -EINVAL; | |
4879 | } | |
4880 | ||
7dd5e7c3 N |
4881 | if (pers->sync_request) { |
4882 | /* Warn if this is a potentially silly | |
4883 | * configuration. | |
4884 | */ | |
4885 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 4886 | struct md_rdev *rdev2; |
7dd5e7c3 | 4887 | int warned = 0; |
159ec1fc | 4888 | |
dafb20fa N |
4889 | rdev_for_each(rdev, mddev) |
4890 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
4891 | if (rdev < rdev2 && |
4892 | rdev->bdev->bd_contains == | |
4893 | rdev2->bdev->bd_contains) { | |
4894 | printk(KERN_WARNING | |
4895 | "%s: WARNING: %s appears to be" | |
4896 | " on the same physical disk as" | |
4897 | " %s.\n", | |
4898 | mdname(mddev), | |
4899 | bdevname(rdev->bdev,b), | |
4900 | bdevname(rdev2->bdev,b2)); | |
4901 | warned = 1; | |
4902 | } | |
4903 | } | |
159ec1fc | 4904 | |
7dd5e7c3 N |
4905 | if (warned) |
4906 | printk(KERN_WARNING | |
4907 | "True protection against single-disk" | |
4908 | " failure might be compromised.\n"); | |
4909 | } | |
4910 | ||
657390d2 | 4911 | mddev->recovery = 0; |
58c0fed4 AN |
4912 | /* may be over-ridden by personality */ |
4913 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4914 | ||
6ff8d8ec | 4915 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4916 | |
0f9552b5 | 4917 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4918 | mddev->ro = 2; /* read-only, but switch on first write */ |
4919 | ||
b15c2e57 | 4920 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4921 | if (err) |
4922 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4923 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4924 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4925 | " but 'external_size' not in effect?\n", __func__); | |
4926 | printk(KERN_ERR | |
4927 | "md: invalid array_size %llu > default size %llu\n", | |
4928 | (unsigned long long)mddev->array_sectors / 2, | |
4929 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4930 | err = -EINVAL; | |
4931 | mddev->pers->stop(mddev); | |
4932 | } | |
ef99bf48 N |
4933 | if (err == 0 && mddev->pers->sync_request && |
4934 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { | |
b15c2e57 N |
4935 | err = bitmap_create(mddev); |
4936 | if (err) { | |
4937 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4938 | mdname(mddev), err); | |
4939 | mddev->pers->stop(mddev); | |
4940 | } | |
4941 | } | |
1da177e4 | 4942 | if (err) { |
1da177e4 LT |
4943 | module_put(mddev->pers->owner); |
4944 | mddev->pers = NULL; | |
32a7627c N |
4945 | bitmap_destroy(mddev); |
4946 | return err; | |
1da177e4 | 4947 | } |
5c675f83 N |
4948 | if (mddev->queue) { |
4949 | mddev->queue->backing_dev_info.congested_data = mddev; | |
4950 | mddev->queue->backing_dev_info.congested_fn = md_congested; | |
64590f45 | 4951 | blk_queue_merge_bvec(mddev->queue, md_mergeable_bvec); |
5c675f83 | 4952 | } |
5e55e2f5 | 4953 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4954 | if (mddev->kobj.sd && |
4955 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4956 | printk(KERN_WARNING |
4957 | "md: cannot register extra attributes for %s\n", | |
4958 | mdname(mddev)); | |
00bcb4ac | 4959 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4960 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4961 | mddev->ro = 0; |
4962 | ||
f72ffdd6 | 4963 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4964 | atomic_set(&mddev->max_corr_read_errors, |
4965 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4966 | mddev->safemode = 0; |
4967 | mddev->safemode_timer.function = md_safemode_timeout; | |
4968 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4969 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4970 | mddev->in_sync = 1; |
0ca69886 N |
4971 | smp_wmb(); |
4972 | mddev->ready = 1; | |
dafb20fa | 4973 | rdev_for_each(rdev, mddev) |
36fad858 NK |
4974 | if (rdev->raid_disk >= 0) |
4975 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 4976 | /* failure here is OK */; |
f72ffdd6 | 4977 | |
1da177e4 | 4978 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 4979 | |
7a0a5355 | 4980 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 4981 | md_update_sb(mddev, 0); |
1da177e4 | 4982 | |
d7603b7e | 4983 | md_new_event(mddev); |
00bcb4ac N |
4984 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4985 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4986 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4987 | return 0; |
4988 | } | |
390ee602 | 4989 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4990 | |
fd01b88c | 4991 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
4992 | { |
4993 | int err; | |
4994 | ||
4995 | err = md_run(mddev); | |
4996 | if (err) | |
4997 | goto out; | |
69e51b44 N |
4998 | err = bitmap_load(mddev); |
4999 | if (err) { | |
5000 | bitmap_destroy(mddev); | |
5001 | goto out; | |
5002 | } | |
0fd018af JB |
5003 | |
5004 | md_wakeup_thread(mddev->thread); | |
5005 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5006 | ||
fe60b014 N |
5007 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5008 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5009 | mddev->changed = 1; |
fe60b014 N |
5010 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5011 | out: | |
5012 | return err; | |
5013 | } | |
5014 | ||
fd01b88c | 5015 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5016 | { |
5017 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5018 | |
80fab1d7 | 5019 | /* Complain if it has no devices */ |
1da177e4 | 5020 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5021 | return -ENXIO; |
5022 | if (!mddev->pers) | |
5023 | return -EINVAL; | |
5024 | if (!mddev->ro) | |
5025 | return -EBUSY; | |
5026 | mddev->safemode = 0; | |
5027 | mddev->ro = 0; | |
5028 | set_disk_ro(disk, 0); | |
5029 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5030 | mdname(mddev)); | |
5031 | /* Kick recovery or resync if necessary */ | |
5032 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5033 | md_wakeup_thread(mddev->thread); | |
5034 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5035 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5036 | return 0; |
1da177e4 LT |
5037 | } |
5038 | ||
fd01b88c | 5039 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5040 | { |
5041 | mddev->array_sectors = 0; | |
5042 | mddev->external_size = 0; | |
5043 | mddev->dev_sectors = 0; | |
5044 | mddev->raid_disks = 0; | |
5045 | mddev->recovery_cp = 0; | |
5046 | mddev->resync_min = 0; | |
5047 | mddev->resync_max = MaxSector; | |
5048 | mddev->reshape_position = MaxSector; | |
5049 | mddev->external = 0; | |
5050 | mddev->persistent = 0; | |
5051 | mddev->level = LEVEL_NONE; | |
5052 | mddev->clevel[0] = 0; | |
5053 | mddev->flags = 0; | |
5054 | mddev->ro = 0; | |
5055 | mddev->metadata_type[0] = 0; | |
5056 | mddev->chunk_sectors = 0; | |
5057 | mddev->ctime = mddev->utime = 0; | |
5058 | mddev->layout = 0; | |
5059 | mddev->max_disks = 0; | |
5060 | mddev->events = 0; | |
a8707c08 | 5061 | mddev->can_decrease_events = 0; |
6177b472 | 5062 | mddev->delta_disks = 0; |
2c810cdd | 5063 | mddev->reshape_backwards = 0; |
6177b472 N |
5064 | mddev->new_level = LEVEL_NONE; |
5065 | mddev->new_layout = 0; | |
5066 | mddev->new_chunk_sectors = 0; | |
5067 | mddev->curr_resync = 0; | |
7f7583d4 | 5068 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5069 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5070 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5071 | mddev->recovery = 0; | |
5072 | mddev->in_sync = 0; | |
f0b4f7e2 | 5073 | mddev->changed = 0; |
6177b472 | 5074 | mddev->degraded = 0; |
6177b472 | 5075 | mddev->safemode = 0; |
050b6615 | 5076 | mddev->merge_check_needed = 0; |
6177b472 N |
5077 | mddev->bitmap_info.offset = 0; |
5078 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5079 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5080 | mddev->bitmap_info.chunksize = 0; |
5081 | mddev->bitmap_info.daemon_sleep = 0; | |
5082 | mddev->bitmap_info.max_write_behind = 0; | |
5083 | } | |
5084 | ||
fd01b88c | 5085 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5086 | { |
6b6204ee | 5087 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5088 | flush_workqueue(md_misc_wq); |
a047e125 | 5089 | if (mddev->sync_thread) { |
a047e125 | 5090 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5091 | md_reap_sync_thread(mddev); |
a047e125 N |
5092 | } |
5093 | ||
5094 | del_timer_sync(&mddev->safemode_timer); | |
5095 | ||
5096 | bitmap_flush(mddev); | |
5097 | md_super_wait(mddev); | |
5098 | ||
b6d428c6 | 5099 | if (mddev->ro == 0 && |
7a0a5355 | 5100 | (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) { |
a047e125 N |
5101 | /* mark array as shutdown cleanly */ |
5102 | mddev->in_sync = 1; | |
5103 | md_update_sb(mddev, 1); | |
5104 | } | |
5105 | } | |
defad61a | 5106 | |
fd01b88c | 5107 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5108 | { |
29f097c4 | 5109 | mddev_lock_nointr(mddev); |
defad61a N |
5110 | __md_stop_writes(mddev); |
5111 | mddev_unlock(mddev); | |
5112 | } | |
390ee602 | 5113 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5114 | |
5eff3c43 | 5115 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5116 | { |
0ca69886 | 5117 | mddev->ready = 0; |
6177b472 N |
5118 | mddev->pers->stop(mddev); |
5119 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
5120 | mddev->to_remove = &md_redundancy_group; | |
5121 | module_put(mddev->pers->owner); | |
5122 | mddev->pers = NULL; | |
cca9cf90 | 5123 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5124 | } |
5eff3c43 N |
5125 | |
5126 | void md_stop(struct mddev *mddev) | |
5127 | { | |
5128 | /* stop the array and free an attached data structures. | |
5129 | * This is called from dm-raid | |
5130 | */ | |
5131 | __md_stop(mddev); | |
5132 | bitmap_destroy(mddev); | |
5133 | if (mddev->bio_set) | |
5134 | bioset_free(mddev->bio_set); | |
5135 | } | |
5136 | ||
390ee602 | 5137 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5138 | |
a05b7ea0 | 5139 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5140 | { |
5141 | int err = 0; | |
30b8feb7 N |
5142 | int did_freeze = 0; |
5143 | ||
5144 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5145 | did_freeze = 1; | |
5146 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5147 | md_wakeup_thread(mddev->thread); | |
5148 | } | |
f851b60d | 5149 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5150 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5151 | if (mddev->sync_thread) |
30b8feb7 N |
5152 | /* Thread might be blocked waiting for metadata update |
5153 | * which will now never happen */ | |
5154 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5155 | |
30b8feb7 | 5156 | mddev_unlock(mddev); |
f851b60d N |
5157 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5158 | &mddev->recovery)); | |
30b8feb7 N |
5159 | mddev_lock_nointr(mddev); |
5160 | ||
a4bd82d0 | 5161 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5162 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5163 | mddev->sync_thread || |
f851b60d | 5164 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5165 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
a4bd82d0 | 5166 | printk("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5167 | if (did_freeze) { |
5168 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5169 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5170 | md_wakeup_thread(mddev->thread); |
5171 | } | |
a4bd82d0 N |
5172 | err = -EBUSY; |
5173 | goto out; | |
5174 | } | |
5175 | if (mddev->pers) { | |
defad61a | 5176 | __md_stop_writes(mddev); |
a4bd82d0 N |
5177 | |
5178 | err = -ENXIO; | |
5179 | if (mddev->ro==1) | |
5180 | goto out; | |
5181 | mddev->ro = 1; | |
5182 | set_disk_ro(mddev->gendisk, 1); | |
5183 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5184 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5185 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5186 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5187 | err = 0; |
a4bd82d0 N |
5188 | } |
5189 | out: | |
5190 | mutex_unlock(&mddev->open_mutex); | |
5191 | return err; | |
5192 | } | |
5193 | ||
9e653b63 N |
5194 | /* mode: |
5195 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5196 | * 2 - stop but do not disassemble array |
5197 | */ | |
f72ffdd6 | 5198 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5199 | struct block_device *bdev) |
1da177e4 | 5200 | { |
1da177e4 | 5201 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5202 | struct md_rdev *rdev; |
30b8feb7 N |
5203 | int did_freeze = 0; |
5204 | ||
5205 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5206 | did_freeze = 1; | |
5207 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5208 | md_wakeup_thread(mddev->thread); | |
5209 | } | |
f851b60d | 5210 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5211 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5212 | if (mddev->sync_thread) |
30b8feb7 N |
5213 | /* Thread might be blocked waiting for metadata update |
5214 | * which will now never happen */ | |
5215 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5216 | |
30b8feb7 | 5217 | mddev_unlock(mddev); |
f851b60d N |
5218 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5219 | !test_bit(MD_RECOVERY_RUNNING, | |
5220 | &mddev->recovery))); | |
30b8feb7 | 5221 | mddev_lock_nointr(mddev); |
1da177e4 | 5222 | |
c8c00a69 | 5223 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5224 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5225 | mddev->sysfs_active || |
5226 | mddev->sync_thread || | |
f851b60d | 5227 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5228 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
df5b20cf | 5229 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5230 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5231 | if (did_freeze) { |
5232 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5233 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5234 | md_wakeup_thread(mddev->thread); |
5235 | } | |
260fa034 N |
5236 | return -EBUSY; |
5237 | } | |
6e17b027 | 5238 | if (mddev->pers) { |
a4bd82d0 N |
5239 | if (mddev->ro) |
5240 | set_disk_ro(disk, 0); | |
409c57f3 | 5241 | |
defad61a | 5242 | __md_stop_writes(mddev); |
5eff3c43 | 5243 | __md_stop(mddev); |
a4bd82d0 | 5244 | mddev->queue->merge_bvec_fn = NULL; |
a4bd82d0 | 5245 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5246 | |
a4bd82d0 | 5247 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5248 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5249 | |
dafb20fa | 5250 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5251 | if (rdev->raid_disk >= 0) |
5252 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5253 | |
a4bd82d0 | 5254 | set_capacity(disk, 0); |
6e17b027 | 5255 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5256 | mddev->changed = 1; |
a4bd82d0 | 5257 | revalidate_disk(disk); |
0d4ca600 | 5258 | |
a4bd82d0 N |
5259 | if (mddev->ro) |
5260 | mddev->ro = 0; | |
6e17b027 N |
5261 | } else |
5262 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5263 | /* |
5264 | * Free resources if final stop | |
5265 | */ | |
9e653b63 | 5266 | if (mode == 0) { |
1da177e4 LT |
5267 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5268 | ||
978f946b | 5269 | bitmap_destroy(mddev); |
c3d9714e | 5270 | if (mddev->bitmap_info.file) { |
c3d9714e N |
5271 | fput(mddev->bitmap_info.file); |
5272 | mddev->bitmap_info.file = NULL; | |
978f946b | 5273 | } |
c3d9714e | 5274 | mddev->bitmap_info.offset = 0; |
978f946b | 5275 | |
1da177e4 LT |
5276 | export_array(mddev); |
5277 | ||
6177b472 | 5278 | md_clean(mddev); |
934d9c23 | 5279 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5280 | if (mddev->hold_active == UNTIL_STOP) |
5281 | mddev->hold_active = 0; | |
a4bd82d0 | 5282 | } |
3f9d99c1 | 5283 | blk_integrity_unregister(disk); |
d7603b7e | 5284 | md_new_event(mddev); |
00bcb4ac | 5285 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5286 | return 0; |
1da177e4 LT |
5287 | } |
5288 | ||
fdee8ae4 | 5289 | #ifndef MODULE |
fd01b88c | 5290 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5291 | { |
3cb03002 | 5292 | struct md_rdev *rdev; |
1da177e4 LT |
5293 | int err; |
5294 | ||
a757e64c | 5295 | if (list_empty(&mddev->disks)) |
1da177e4 | 5296 | return; |
1da177e4 LT |
5297 | |
5298 | printk(KERN_INFO "md: running: "); | |
5299 | ||
dafb20fa | 5300 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5301 | char b[BDEVNAME_SIZE]; |
5302 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5303 | } | |
5304 | printk("\n"); | |
5305 | ||
d710e138 | 5306 | err = do_md_run(mddev); |
1da177e4 LT |
5307 | if (err) { |
5308 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5309 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5310 | } |
5311 | } | |
5312 | ||
5313 | /* | |
5314 | * lets try to run arrays based on all disks that have arrived | |
5315 | * until now. (those are in pending_raid_disks) | |
5316 | * | |
5317 | * the method: pick the first pending disk, collect all disks with | |
5318 | * the same UUID, remove all from the pending list and put them into | |
5319 | * the 'same_array' list. Then order this list based on superblock | |
5320 | * update time (freshest comes first), kick out 'old' disks and | |
5321 | * compare superblocks. If everything's fine then run it. | |
5322 | * | |
5323 | * If "unit" is allocated, then bump its reference count | |
5324 | */ | |
5325 | static void autorun_devices(int part) | |
5326 | { | |
3cb03002 | 5327 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5328 | struct mddev *mddev; |
1da177e4 LT |
5329 | char b[BDEVNAME_SIZE]; |
5330 | ||
5331 | printk(KERN_INFO "md: autorun ...\n"); | |
5332 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5333 | int unit; |
1da177e4 | 5334 | dev_t dev; |
ad01c9e3 | 5335 | LIST_HEAD(candidates); |
1da177e4 | 5336 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5337 | struct md_rdev, same_set); |
1da177e4 LT |
5338 | |
5339 | printk(KERN_INFO "md: considering %s ...\n", | |
5340 | bdevname(rdev0->bdev,b)); | |
5341 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5342 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5343 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5344 | printk(KERN_INFO "md: adding %s ...\n", | |
5345 | bdevname(rdev->bdev,b)); | |
5346 | list_move(&rdev->same_set, &candidates); | |
5347 | } | |
5348 | /* | |
5349 | * now we have a set of devices, with all of them having | |
5350 | * mostly sane superblocks. It's time to allocate the | |
5351 | * mddev. | |
5352 | */ | |
e8703fe1 N |
5353 | if (part) { |
5354 | dev = MKDEV(mdp_major, | |
5355 | rdev0->preferred_minor << MdpMinorShift); | |
5356 | unit = MINOR(dev) >> MdpMinorShift; | |
5357 | } else { | |
5358 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5359 | unit = MINOR(dev); | |
5360 | } | |
5361 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5362 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5363 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5364 | break; | |
5365 | } | |
1da177e4 LT |
5366 | |
5367 | md_probe(dev, NULL, NULL); | |
5368 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5369 | if (!mddev || !mddev->gendisk) { |
5370 | if (mddev) | |
5371 | mddev_put(mddev); | |
5372 | printk(KERN_ERR | |
1da177e4 LT |
5373 | "md: cannot allocate memory for md drive.\n"); |
5374 | break; | |
5375 | } | |
f72ffdd6 | 5376 | if (mddev_lock(mddev)) |
1da177e4 LT |
5377 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
5378 | mdname(mddev)); | |
5379 | else if (mddev->raid_disks || mddev->major_version | |
5380 | || !list_empty(&mddev->disks)) { | |
f72ffdd6 | 5381 | printk(KERN_WARNING |
1da177e4 LT |
5382 | "md: %s already running, cannot run %s\n", |
5383 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5384 | mddev_unlock(mddev); | |
5385 | } else { | |
5386 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5387 | mddev->persistent = 1; |
159ec1fc | 5388 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5389 | list_del_init(&rdev->same_set); |
5390 | if (bind_rdev_to_array(rdev, mddev)) | |
5391 | export_rdev(rdev); | |
5392 | } | |
5393 | autorun_array(mddev); | |
5394 | mddev_unlock(mddev); | |
5395 | } | |
5396 | /* on success, candidates will be empty, on error | |
5397 | * it won't... | |
5398 | */ | |
159ec1fc | 5399 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5400 | list_del_init(&rdev->same_set); |
1da177e4 | 5401 | export_rdev(rdev); |
4b80991c | 5402 | } |
1da177e4 LT |
5403 | mddev_put(mddev); |
5404 | } | |
5405 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5406 | } | |
fdee8ae4 | 5407 | #endif /* !MODULE */ |
1da177e4 | 5408 | |
f72ffdd6 | 5409 | static int get_version(void __user *arg) |
1da177e4 LT |
5410 | { |
5411 | mdu_version_t ver; | |
5412 | ||
5413 | ver.major = MD_MAJOR_VERSION; | |
5414 | ver.minor = MD_MINOR_VERSION; | |
5415 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5416 | ||
5417 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5418 | return -EFAULT; | |
5419 | ||
5420 | return 0; | |
5421 | } | |
5422 | ||
f72ffdd6 | 5423 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
5424 | { |
5425 | mdu_array_info_t info; | |
a9f326eb | 5426 | int nr,working,insync,failed,spare; |
3cb03002 | 5427 | struct md_rdev *rdev; |
1da177e4 | 5428 | |
1ca69c4b N |
5429 | nr = working = insync = failed = spare = 0; |
5430 | rcu_read_lock(); | |
5431 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5432 | nr++; |
b2d444d7 | 5433 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5434 | failed++; |
5435 | else { | |
5436 | working++; | |
b2d444d7 | 5437 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 5438 | insync++; |
1da177e4 LT |
5439 | else |
5440 | spare++; | |
5441 | } | |
5442 | } | |
1ca69c4b | 5443 | rcu_read_unlock(); |
1da177e4 LT |
5444 | |
5445 | info.major_version = mddev->major_version; | |
5446 | info.minor_version = mddev->minor_version; | |
5447 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5448 | info.ctime = mddev->ctime; | |
5449 | info.level = mddev->level; | |
58c0fed4 AN |
5450 | info.size = mddev->dev_sectors / 2; |
5451 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5452 | info.size = -1; |
1da177e4 LT |
5453 | info.nr_disks = nr; |
5454 | info.raid_disks = mddev->raid_disks; | |
5455 | info.md_minor = mddev->md_minor; | |
5456 | info.not_persistent= !mddev->persistent; | |
5457 | ||
5458 | info.utime = mddev->utime; | |
5459 | info.state = 0; | |
5460 | if (mddev->in_sync) | |
5461 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5462 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 5463 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5464 | info.active_disks = insync; |
1da177e4 LT |
5465 | info.working_disks = working; |
5466 | info.failed_disks = failed; | |
5467 | info.spare_disks = spare; | |
5468 | ||
5469 | info.layout = mddev->layout; | |
9d8f0363 | 5470 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5471 | |
5472 | if (copy_to_user(arg, &info, sizeof(info))) | |
5473 | return -EFAULT; | |
5474 | ||
5475 | return 0; | |
5476 | } | |
5477 | ||
f72ffdd6 | 5478 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
5479 | { |
5480 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5481 | char *ptr, *buf = NULL; | |
5482 | int err = -ENOMEM; | |
5483 | ||
60559da4 | 5484 | file = kmalloc(sizeof(*file), GFP_NOIO); |
2a2275d6 | 5485 | |
32a7627c N |
5486 | if (!file) |
5487 | goto out; | |
5488 | ||
5489 | /* bitmap disabled, zero the first byte and copy out */ | |
1ec885cd | 5490 | if (!mddev->bitmap || !mddev->bitmap->storage.file) { |
32a7627c N |
5491 | file->pathname[0] = '\0'; |
5492 | goto copy_out; | |
5493 | } | |
5494 | ||
5495 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5496 | if (!buf) | |
5497 | goto out; | |
5498 | ||
1ec885cd N |
5499 | ptr = d_path(&mddev->bitmap->storage.file->f_path, |
5500 | buf, sizeof(file->pathname)); | |
6bcfd601 | 5501 | if (IS_ERR(ptr)) |
32a7627c N |
5502 | goto out; |
5503 | ||
5504 | strcpy(file->pathname, ptr); | |
5505 | ||
5506 | copy_out: | |
5507 | err = 0; | |
5508 | if (copy_to_user(arg, file, sizeof(*file))) | |
5509 | err = -EFAULT; | |
5510 | out: | |
5511 | kfree(buf); | |
5512 | kfree(file); | |
5513 | return err; | |
5514 | } | |
5515 | ||
f72ffdd6 | 5516 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
5517 | { |
5518 | mdu_disk_info_t info; | |
3cb03002 | 5519 | struct md_rdev *rdev; |
1da177e4 LT |
5520 | |
5521 | if (copy_from_user(&info, arg, sizeof(info))) | |
5522 | return -EFAULT; | |
5523 | ||
1ca69c4b N |
5524 | rcu_read_lock(); |
5525 | rdev = find_rdev_nr_rcu(mddev, info.number); | |
1da177e4 LT |
5526 | if (rdev) { |
5527 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5528 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5529 | info.raid_disk = rdev->raid_disk; | |
5530 | info.state = 0; | |
b2d444d7 | 5531 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5532 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5533 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5534 | info.state |= (1<<MD_DISK_ACTIVE); |
5535 | info.state |= (1<<MD_DISK_SYNC); | |
5536 | } | |
8ddf9efe N |
5537 | if (test_bit(WriteMostly, &rdev->flags)) |
5538 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5539 | } else { |
5540 | info.major = info.minor = 0; | |
5541 | info.raid_disk = -1; | |
5542 | info.state = (1<<MD_DISK_REMOVED); | |
5543 | } | |
1ca69c4b | 5544 | rcu_read_unlock(); |
1da177e4 LT |
5545 | |
5546 | if (copy_to_user(arg, &info, sizeof(info))) | |
5547 | return -EFAULT; | |
5548 | ||
5549 | return 0; | |
5550 | } | |
5551 | ||
f72ffdd6 | 5552 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5553 | { |
5554 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5555 | struct md_rdev *rdev; |
1da177e4 LT |
5556 | dev_t dev = MKDEV(info->major,info->minor); |
5557 | ||
5558 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5559 | return -EOVERFLOW; | |
5560 | ||
5561 | if (!mddev->raid_disks) { | |
5562 | int err; | |
5563 | /* expecting a device which has a superblock */ | |
5564 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5565 | if (IS_ERR(rdev)) { | |
f72ffdd6 | 5566 | printk(KERN_WARNING |
1da177e4 LT |
5567 | "md: md_import_device returned %ld\n", |
5568 | PTR_ERR(rdev)); | |
5569 | return PTR_ERR(rdev); | |
5570 | } | |
5571 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5572 | struct md_rdev *rdev0 |
5573 | = list_entry(mddev->disks.next, | |
5574 | struct md_rdev, same_set); | |
a9f326eb | 5575 | err = super_types[mddev->major_version] |
1da177e4 LT |
5576 | .load_super(rdev, rdev0, mddev->minor_version); |
5577 | if (err < 0) { | |
f72ffdd6 | 5578 | printk(KERN_WARNING |
1da177e4 | 5579 | "md: %s has different UUID to %s\n", |
f72ffdd6 | 5580 | bdevname(rdev->bdev,b), |
1da177e4 LT |
5581 | bdevname(rdev0->bdev,b2)); |
5582 | export_rdev(rdev); | |
5583 | return -EINVAL; | |
5584 | } | |
5585 | } | |
5586 | err = bind_rdev_to_array(rdev, mddev); | |
5587 | if (err) | |
5588 | export_rdev(rdev); | |
5589 | return err; | |
5590 | } | |
5591 | ||
5592 | /* | |
5593 | * add_new_disk can be used once the array is assembled | |
5594 | * to add "hot spares". They must already have a superblock | |
5595 | * written | |
5596 | */ | |
5597 | if (mddev->pers) { | |
5598 | int err; | |
5599 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5600 | printk(KERN_WARNING |
1da177e4 LT |
5601 | "%s: personality does not support diskops!\n", |
5602 | mdname(mddev)); | |
5603 | return -EINVAL; | |
5604 | } | |
7b1e35f6 N |
5605 | if (mddev->persistent) |
5606 | rdev = md_import_device(dev, mddev->major_version, | |
5607 | mddev->minor_version); | |
5608 | else | |
5609 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 5610 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5611 | printk(KERN_WARNING |
1da177e4 LT |
5612 | "md: md_import_device returned %ld\n", |
5613 | PTR_ERR(rdev)); | |
5614 | return PTR_ERR(rdev); | |
5615 | } | |
1a855a06 | 5616 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5617 | if (!mddev->persistent) { |
5618 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5619 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5620 | rdev->raid_disk = info->raid_disk; |
bf572541 | 5621 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 5622 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 5623 | } else |
41158c7e | 5624 | rdev->raid_disk = -1; |
f466722c | 5625 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
5626 | } else |
5627 | super_types[mddev->major_version]. | |
5628 | validate_super(mddev, rdev); | |
bedd86b7 | 5629 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 5630 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
5631 | /* This was a hot-add request, but events doesn't |
5632 | * match, so reject it. | |
5633 | */ | |
5634 | export_rdev(rdev); | |
5635 | return -EINVAL; | |
5636 | } | |
5637 | ||
b2d444d7 | 5638 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5639 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5640 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5641 | else |
5642 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5643 | |
1da177e4 LT |
5644 | rdev->raid_disk = -1; |
5645 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5646 | if (!err && !mddev->pers->hot_remove_disk) { |
5647 | /* If there is hot_add_disk but no hot_remove_disk | |
5648 | * then added disks for geometry changes, | |
5649 | * and should be added immediately. | |
5650 | */ | |
5651 | super_types[mddev->major_version]. | |
5652 | validate_super(mddev, rdev); | |
5653 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5654 | if (err) | |
5655 | unbind_rdev_from_array(rdev); | |
5656 | } | |
1da177e4 LT |
5657 | if (err) |
5658 | export_rdev(rdev); | |
52664732 | 5659 | else |
00bcb4ac | 5660 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5661 | |
7ceb17e8 | 5662 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
72a23c21 NB |
5663 | if (mddev->degraded) |
5664 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5665 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5666 | if (!err) |
5667 | md_new_event(mddev); | |
005eca5e | 5668 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5669 | return err; |
5670 | } | |
5671 | ||
5672 | /* otherwise, add_new_disk is only allowed | |
5673 | * for major_version==0 superblocks | |
5674 | */ | |
5675 | if (mddev->major_version != 0) { | |
5676 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5677 | mdname(mddev)); | |
5678 | return -EINVAL; | |
5679 | } | |
5680 | ||
5681 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5682 | int err; | |
d710e138 | 5683 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5684 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5685 | printk(KERN_WARNING |
1da177e4 LT |
5686 | "md: error, md_import_device() returned %ld\n", |
5687 | PTR_ERR(rdev)); | |
5688 | return PTR_ERR(rdev); | |
5689 | } | |
5690 | rdev->desc_nr = info->number; | |
5691 | if (info->raid_disk < mddev->raid_disks) | |
5692 | rdev->raid_disk = info->raid_disk; | |
5693 | else | |
5694 | rdev->raid_disk = -1; | |
5695 | ||
1da177e4 | 5696 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5697 | if (info->state & (1<<MD_DISK_SYNC)) |
5698 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5699 | |
8ddf9efe N |
5700 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5701 | set_bit(WriteMostly, &rdev->flags); | |
5702 | ||
1da177e4 LT |
5703 | if (!mddev->persistent) { |
5704 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5705 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5706 | } else | |
57b2caa3 | 5707 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5708 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5709 | |
2bf071bf N |
5710 | err = bind_rdev_to_array(rdev, mddev); |
5711 | if (err) { | |
5712 | export_rdev(rdev); | |
5713 | return err; | |
5714 | } | |
1da177e4 LT |
5715 | } |
5716 | ||
5717 | return 0; | |
5718 | } | |
5719 | ||
f72ffdd6 | 5720 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5721 | { |
5722 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 5723 | struct md_rdev *rdev; |
1da177e4 | 5724 | |
1da177e4 LT |
5725 | rdev = find_rdev(mddev, dev); |
5726 | if (!rdev) | |
5727 | return -ENXIO; | |
5728 | ||
3ea8929d N |
5729 | clear_bit(Blocked, &rdev->flags); |
5730 | remove_and_add_spares(mddev, rdev); | |
5731 | ||
1da177e4 LT |
5732 | if (rdev->raid_disk >= 0) |
5733 | goto busy; | |
5734 | ||
5735 | kick_rdev_from_array(rdev); | |
850b2b42 | 5736 | md_update_sb(mddev, 1); |
d7603b7e | 5737 | md_new_event(mddev); |
1da177e4 LT |
5738 | |
5739 | return 0; | |
5740 | busy: | |
fdefa4d8 | 5741 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5742 | bdevname(rdev->bdev,b), mdname(mddev)); |
5743 | return -EBUSY; | |
5744 | } | |
5745 | ||
f72ffdd6 | 5746 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5747 | { |
5748 | char b[BDEVNAME_SIZE]; | |
5749 | int err; | |
3cb03002 | 5750 | struct md_rdev *rdev; |
1da177e4 LT |
5751 | |
5752 | if (!mddev->pers) | |
5753 | return -ENODEV; | |
5754 | ||
5755 | if (mddev->major_version != 0) { | |
5756 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5757 | " version-0 superblocks.\n", | |
5758 | mdname(mddev)); | |
5759 | return -EINVAL; | |
5760 | } | |
5761 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5762 | printk(KERN_WARNING |
1da177e4 LT |
5763 | "%s: personality does not support diskops!\n", |
5764 | mdname(mddev)); | |
5765 | return -EINVAL; | |
5766 | } | |
5767 | ||
d710e138 | 5768 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5769 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5770 | printk(KERN_WARNING |
1da177e4 LT |
5771 | "md: error, md_import_device() returned %ld\n", |
5772 | PTR_ERR(rdev)); | |
5773 | return -EINVAL; | |
5774 | } | |
5775 | ||
5776 | if (mddev->persistent) | |
57b2caa3 | 5777 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5778 | else |
77304d2a | 5779 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5780 | |
8190e754 | 5781 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5782 | |
b2d444d7 | 5783 | if (test_bit(Faulty, &rdev->flags)) { |
f72ffdd6 | 5784 | printk(KERN_WARNING |
1da177e4 LT |
5785 | "md: can not hot-add faulty %s disk to %s!\n", |
5786 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5787 | err = -EINVAL; | |
5788 | goto abort_export; | |
5789 | } | |
b2d444d7 | 5790 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5791 | rdev->desc_nr = -1; |
5842730d | 5792 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5793 | err = bind_rdev_to_array(rdev, mddev); |
5794 | if (err) | |
5795 | goto abort_export; | |
1da177e4 LT |
5796 | |
5797 | /* | |
5798 | * The rest should better be atomic, we can have disk failures | |
5799 | * noticed in interrupt contexts ... | |
5800 | */ | |
5801 | ||
1da177e4 LT |
5802 | rdev->raid_disk = -1; |
5803 | ||
850b2b42 | 5804 | md_update_sb(mddev, 1); |
1da177e4 LT |
5805 | |
5806 | /* | |
5807 | * Kick recovery, maybe this spare has to be added to the | |
5808 | * array immediately. | |
5809 | */ | |
5810 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5811 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5812 | md_new_event(mddev); |
1da177e4 LT |
5813 | return 0; |
5814 | ||
1da177e4 LT |
5815 | abort_export: |
5816 | export_rdev(rdev); | |
5817 | return err; | |
5818 | } | |
5819 | ||
fd01b88c | 5820 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 5821 | { |
035328c2 | 5822 | int err = 0; |
32a7627c | 5823 | |
36fa3063 | 5824 | if (mddev->pers) { |
d66b1b39 | 5825 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
5826 | return -EBUSY; |
5827 | if (mddev->recovery || mddev->sync_thread) | |
5828 | return -EBUSY; | |
5829 | /* we should be able to change the bitmap.. */ | |
5830 | } | |
32a7627c | 5831 | |
36fa3063 | 5832 | if (fd >= 0) { |
035328c2 | 5833 | struct inode *inode; |
36fa3063 N |
5834 | if (mddev->bitmap) |
5835 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5836 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5837 | |
c3d9714e | 5838 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5839 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5840 | mdname(mddev)); | |
5841 | return -EBADF; | |
5842 | } | |
5843 | ||
035328c2 N |
5844 | inode = mddev->bitmap_info.file->f_mapping->host; |
5845 | if (!S_ISREG(inode->i_mode)) { | |
5846 | printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", | |
5847 | mdname(mddev)); | |
5848 | err = -EBADF; | |
5849 | } else if (!(mddev->bitmap_info.file->f_mode & FMODE_WRITE)) { | |
5850 | printk(KERN_ERR "%s: error: bitmap file must open for write\n", | |
5851 | mdname(mddev)); | |
5852 | err = -EBADF; | |
5853 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
36fa3063 N |
5854 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
5855 | mdname(mddev)); | |
035328c2 N |
5856 | err = -EBUSY; |
5857 | } | |
5858 | if (err) { | |
c3d9714e N |
5859 | fput(mddev->bitmap_info.file); |
5860 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5861 | return err; |
5862 | } | |
c3d9714e | 5863 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5864 | } else if (mddev->bitmap == NULL) |
5865 | return -ENOENT; /* cannot remove what isn't there */ | |
5866 | err = 0; | |
5867 | if (mddev->pers) { | |
5868 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5869 | if (fd >= 0) { |
36fa3063 | 5870 | err = bitmap_create(mddev); |
69e51b44 N |
5871 | if (!err) |
5872 | err = bitmap_load(mddev); | |
5873 | } | |
d7375ab3 | 5874 | if (fd < 0 || err) { |
36fa3063 | 5875 | bitmap_destroy(mddev); |
d7375ab3 N |
5876 | fd = -1; /* make sure to put the file */ |
5877 | } | |
36fa3063 | 5878 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5879 | } |
5880 | if (fd < 0) { | |
035328c2 | 5881 | if (mddev->bitmap_info.file) |
c3d9714e | 5882 | fput(mddev->bitmap_info.file); |
c3d9714e | 5883 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5884 | } |
5885 | ||
32a7627c N |
5886 | return err; |
5887 | } | |
5888 | ||
1da177e4 LT |
5889 | /* |
5890 | * set_array_info is used two different ways | |
5891 | * The original usage is when creating a new array. | |
5892 | * In this usage, raid_disks is > 0 and it together with | |
5893 | * level, size, not_persistent,layout,chunksize determine the | |
5894 | * shape of the array. | |
5895 | * This will always create an array with a type-0.90.0 superblock. | |
5896 | * The newer usage is when assembling an array. | |
5897 | * In this case raid_disks will be 0, and the major_version field is | |
5898 | * use to determine which style super-blocks are to be found on the devices. | |
5899 | * The minor and patch _version numbers are also kept incase the | |
5900 | * super_block handler wishes to interpret them. | |
5901 | */ | |
f72ffdd6 | 5902 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
5903 | { |
5904 | ||
5905 | if (info->raid_disks == 0) { | |
5906 | /* just setting version number for superblock loading */ | |
5907 | if (info->major_version < 0 || | |
50511da3 | 5908 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5909 | super_types[info->major_version].name == NULL) { |
5910 | /* maybe try to auto-load a module? */ | |
f72ffdd6 | 5911 | printk(KERN_INFO |
1da177e4 LT |
5912 | "md: superblock version %d not known\n", |
5913 | info->major_version); | |
5914 | return -EINVAL; | |
5915 | } | |
5916 | mddev->major_version = info->major_version; | |
5917 | mddev->minor_version = info->minor_version; | |
5918 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5919 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5920 | /* ensure mddev_put doesn't delete this now that there |
5921 | * is some minimal configuration. | |
5922 | */ | |
5923 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5924 | return 0; |
5925 | } | |
5926 | mddev->major_version = MD_MAJOR_VERSION; | |
5927 | mddev->minor_version = MD_MINOR_VERSION; | |
5928 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5929 | mddev->ctime = get_seconds(); | |
5930 | ||
5931 | mddev->level = info->level; | |
17115e03 | 5932 | mddev->clevel[0] = 0; |
58c0fed4 | 5933 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5934 | mddev->raid_disks = info->raid_disks; |
5935 | /* don't set md_minor, it is determined by which /dev/md* was | |
5936 | * openned | |
5937 | */ | |
5938 | if (info->state & (1<<MD_SB_CLEAN)) | |
5939 | mddev->recovery_cp = MaxSector; | |
5940 | else | |
5941 | mddev->recovery_cp = 0; | |
5942 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5943 | mddev->external = 0; |
1da177e4 LT |
5944 | |
5945 | mddev->layout = info->layout; | |
9d8f0363 | 5946 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5947 | |
5948 | mddev->max_disks = MD_SB_DISKS; | |
5949 | ||
e691063a N |
5950 | if (mddev->persistent) |
5951 | mddev->flags = 0; | |
850b2b42 | 5952 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5953 | |
c3d9714e | 5954 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 5955 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 5956 | mddev->bitmap_info.offset = 0; |
b2a2703c | 5957 | |
f6705578 N |
5958 | mddev->reshape_position = MaxSector; |
5959 | ||
1da177e4 LT |
5960 | /* |
5961 | * Generate a 128 bit UUID | |
5962 | */ | |
5963 | get_random_bytes(mddev->uuid, 16); | |
5964 | ||
f6705578 | 5965 | mddev->new_level = mddev->level; |
664e7c41 | 5966 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5967 | mddev->new_layout = mddev->layout; |
5968 | mddev->delta_disks = 0; | |
2c810cdd | 5969 | mddev->reshape_backwards = 0; |
f6705578 | 5970 | |
1da177e4 LT |
5971 | return 0; |
5972 | } | |
5973 | ||
fd01b88c | 5974 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 5975 | { |
b522adcd DW |
5976 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5977 | ||
5978 | if (mddev->external_size) | |
5979 | return; | |
5980 | ||
1f403624 DW |
5981 | mddev->array_sectors = array_sectors; |
5982 | } | |
5983 | EXPORT_SYMBOL(md_set_array_sectors); | |
5984 | ||
fd01b88c | 5985 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 5986 | { |
3cb03002 | 5987 | struct md_rdev *rdev; |
a35b0d69 | 5988 | int rv; |
d71f9f88 | 5989 | int fit = (num_sectors == 0); |
a35b0d69 N |
5990 | |
5991 | if (mddev->pers->resize == NULL) | |
5992 | return -EINVAL; | |
d71f9f88 AN |
5993 | /* The "num_sectors" is the number of sectors of each device that |
5994 | * is used. This can only make sense for arrays with redundancy. | |
5995 | * linear and raid0 always use whatever space is available. We can only | |
5996 | * consider changing this number if no resync or reconstruction is | |
5997 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5998 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5999 | * of each device. If num_sectors is zero, we find the largest size |
6000 | * that fits. | |
a35b0d69 | 6001 | */ |
f851b60d N |
6002 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
6003 | mddev->sync_thread) | |
a35b0d69 | 6004 | return -EBUSY; |
bd8839e0 N |
6005 | if (mddev->ro) |
6006 | return -EROFS; | |
a4a6125a | 6007 | |
dafb20fa | 6008 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6009 | sector_t avail = rdev->sectors; |
01ab5662 | 6010 | |
d71f9f88 AN |
6011 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6012 | num_sectors = avail; | |
6013 | if (avail < num_sectors) | |
a35b0d69 N |
6014 | return -ENOSPC; |
6015 | } | |
d71f9f88 | 6016 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6017 | if (!rv) |
6018 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6019 | return rv; |
6020 | } | |
6021 | ||
fd01b88c | 6022 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6023 | { |
6024 | int rv; | |
c6563a8c | 6025 | struct md_rdev *rdev; |
da943b99 | 6026 | /* change the number of raid disks */ |
63c70c4f | 6027 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6028 | return -EINVAL; |
bd8839e0 N |
6029 | if (mddev->ro) |
6030 | return -EROFS; | |
da943b99 | 6031 | if (raid_disks <= 0 || |
233fca36 | 6032 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6033 | return -EINVAL; |
f851b60d N |
6034 | if (mddev->sync_thread || |
6035 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6036 | mddev->reshape_position != MaxSector) | |
da943b99 | 6037 | return -EBUSY; |
c6563a8c N |
6038 | |
6039 | rdev_for_each(rdev, mddev) { | |
6040 | if (mddev->raid_disks < raid_disks && | |
6041 | rdev->data_offset < rdev->new_data_offset) | |
6042 | return -EINVAL; | |
6043 | if (mddev->raid_disks > raid_disks && | |
6044 | rdev->data_offset > rdev->new_data_offset) | |
6045 | return -EINVAL; | |
6046 | } | |
6047 | ||
63c70c4f | 6048 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6049 | if (mddev->delta_disks < 0) |
6050 | mddev->reshape_backwards = 1; | |
6051 | else if (mddev->delta_disks > 0) | |
6052 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6053 | |
6054 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6055 | if (rv < 0) { |
de171cb9 | 6056 | mddev->delta_disks = 0; |
2c810cdd N |
6057 | mddev->reshape_backwards = 0; |
6058 | } | |
da943b99 N |
6059 | return rv; |
6060 | } | |
6061 | ||
1da177e4 LT |
6062 | /* |
6063 | * update_array_info is used to change the configuration of an | |
6064 | * on-line array. | |
6065 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6066 | * fields in the info are checked against the array. | |
6067 | * Any differences that cannot be handled will cause an error. | |
6068 | * Normally, only one change can be managed at a time. | |
6069 | */ | |
fd01b88c | 6070 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6071 | { |
6072 | int rv = 0; | |
6073 | int cnt = 0; | |
36fa3063 N |
6074 | int state = 0; |
6075 | ||
6076 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6077 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6078 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6079 | |
6080 | if (mddev->major_version != info->major_version || | |
6081 | mddev->minor_version != info->minor_version || | |
6082 | /* mddev->patch_version != info->patch_version || */ | |
6083 | mddev->ctime != info->ctime || | |
6084 | mddev->level != info->level || | |
6085 | /* mddev->layout != info->layout || */ | |
6086 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 6087 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6088 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6089 | ((state^info->state) & 0xfffffe00) | |
6090 | ) | |
1da177e4 LT |
6091 | return -EINVAL; |
6092 | /* Check there is only one change */ | |
58c0fed4 AN |
6093 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6094 | cnt++; | |
6095 | if (mddev->raid_disks != info->raid_disks) | |
6096 | cnt++; | |
6097 | if (mddev->layout != info->layout) | |
6098 | cnt++; | |
6099 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6100 | cnt++; | |
6101 | if (cnt == 0) | |
6102 | return 0; | |
6103 | if (cnt > 1) | |
6104 | return -EINVAL; | |
1da177e4 LT |
6105 | |
6106 | if (mddev->layout != info->layout) { | |
6107 | /* Change layout | |
6108 | * we don't need to do anything at the md level, the | |
6109 | * personality will take care of it all. | |
6110 | */ | |
50ac168a | 6111 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6112 | return -EINVAL; |
597a711b N |
6113 | else { |
6114 | mddev->new_layout = info->layout; | |
50ac168a | 6115 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6116 | if (rv) |
6117 | mddev->new_layout = mddev->layout; | |
6118 | return rv; | |
6119 | } | |
1da177e4 | 6120 | } |
58c0fed4 | 6121 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6122 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6123 | |
da943b99 N |
6124 | if (mddev->raid_disks != info->raid_disks) |
6125 | rv = update_raid_disks(mddev, info->raid_disks); | |
6126 | ||
36fa3063 | 6127 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
d66b1b39 | 6128 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) |
36fa3063 N |
6129 | return -EINVAL; |
6130 | if (mddev->recovery || mddev->sync_thread) | |
6131 | return -EBUSY; | |
6132 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
6133 | /* add the bitmap */ | |
6134 | if (mddev->bitmap) | |
6135 | return -EEXIST; | |
c3d9714e | 6136 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 6137 | return -EINVAL; |
c3d9714e N |
6138 | mddev->bitmap_info.offset = |
6139 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6140 | mddev->bitmap_info.space = |
6141 | mddev->bitmap_info.default_space; | |
36fa3063 N |
6142 | mddev->pers->quiesce(mddev, 1); |
6143 | rv = bitmap_create(mddev); | |
69e51b44 N |
6144 | if (!rv) |
6145 | rv = bitmap_load(mddev); | |
36fa3063 N |
6146 | if (rv) |
6147 | bitmap_destroy(mddev); | |
6148 | mddev->pers->quiesce(mddev, 0); | |
6149 | } else { | |
6150 | /* remove the bitmap */ | |
6151 | if (!mddev->bitmap) | |
6152 | return -ENOENT; | |
1ec885cd | 6153 | if (mddev->bitmap->storage.file) |
36fa3063 N |
6154 | return -EINVAL; |
6155 | mddev->pers->quiesce(mddev, 1); | |
6156 | bitmap_destroy(mddev); | |
6157 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6158 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6159 | } |
6160 | } | |
850b2b42 | 6161 | md_update_sb(mddev, 1); |
1da177e4 LT |
6162 | return rv; |
6163 | } | |
6164 | ||
fd01b88c | 6165 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6166 | { |
3cb03002 | 6167 | struct md_rdev *rdev; |
1ca69c4b | 6168 | int err = 0; |
1da177e4 LT |
6169 | |
6170 | if (mddev->pers == NULL) | |
6171 | return -ENODEV; | |
6172 | ||
1ca69c4b N |
6173 | rcu_read_lock(); |
6174 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6175 | if (!rdev) |
1ca69c4b N |
6176 | err = -ENODEV; |
6177 | else { | |
6178 | md_error(mddev, rdev); | |
6179 | if (!test_bit(Faulty, &rdev->flags)) | |
6180 | err = -EBUSY; | |
6181 | } | |
6182 | rcu_read_unlock(); | |
6183 | return err; | |
1da177e4 LT |
6184 | } |
6185 | ||
2f9618ce AN |
6186 | /* |
6187 | * We have a problem here : there is no easy way to give a CHS | |
6188 | * virtual geometry. We currently pretend that we have a 2 heads | |
6189 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6190 | * dosfs just mad... ;-) | |
6191 | */ | |
a885c8c4 CH |
6192 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6193 | { | |
fd01b88c | 6194 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6195 | |
6196 | geo->heads = 2; | |
6197 | geo->sectors = 4; | |
49ce6cea | 6198 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6199 | return 0; |
6200 | } | |
6201 | ||
cb335f88 NS |
6202 | static inline bool md_ioctl_valid(unsigned int cmd) |
6203 | { | |
6204 | switch (cmd) { | |
6205 | case ADD_NEW_DISK: | |
6206 | case BLKROSET: | |
6207 | case GET_ARRAY_INFO: | |
6208 | case GET_BITMAP_FILE: | |
6209 | case GET_DISK_INFO: | |
6210 | case HOT_ADD_DISK: | |
6211 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
6212 | case RAID_AUTORUN: |
6213 | case RAID_VERSION: | |
6214 | case RESTART_ARRAY_RW: | |
6215 | case RUN_ARRAY: | |
6216 | case SET_ARRAY_INFO: | |
6217 | case SET_BITMAP_FILE: | |
6218 | case SET_DISK_FAULTY: | |
6219 | case STOP_ARRAY: | |
6220 | case STOP_ARRAY_RO: | |
6221 | return true; | |
6222 | default: | |
6223 | return false; | |
6224 | } | |
6225 | } | |
6226 | ||
a39907fa | 6227 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6228 | unsigned int cmd, unsigned long arg) |
6229 | { | |
6230 | int err = 0; | |
6231 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6232 | struct mddev *mddev = NULL; |
e2218350 | 6233 | int ro; |
1da177e4 | 6234 | |
cb335f88 NS |
6235 | if (!md_ioctl_valid(cmd)) |
6236 | return -ENOTTY; | |
6237 | ||
506c9e44 N |
6238 | switch (cmd) { |
6239 | case RAID_VERSION: | |
6240 | case GET_ARRAY_INFO: | |
6241 | case GET_DISK_INFO: | |
6242 | break; | |
6243 | default: | |
6244 | if (!capable(CAP_SYS_ADMIN)) | |
6245 | return -EACCES; | |
6246 | } | |
1da177e4 LT |
6247 | |
6248 | /* | |
6249 | * Commands dealing with the RAID driver but not any | |
6250 | * particular array: | |
6251 | */ | |
c02c0aeb N |
6252 | switch (cmd) { |
6253 | case RAID_VERSION: | |
6254 | err = get_version(argp); | |
3adc28d8 | 6255 | goto out; |
1da177e4 | 6256 | |
1da177e4 | 6257 | #ifndef MODULE |
c02c0aeb N |
6258 | case RAID_AUTORUN: |
6259 | err = 0; | |
6260 | autostart_arrays(arg); | |
3adc28d8 | 6261 | goto out; |
1da177e4 | 6262 | #endif |
c02c0aeb | 6263 | default:; |
1da177e4 LT |
6264 | } |
6265 | ||
6266 | /* | |
6267 | * Commands creating/starting a new array: | |
6268 | */ | |
6269 | ||
a39907fa | 6270 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6271 | |
6272 | if (!mddev) { | |
6273 | BUG(); | |
3adc28d8 | 6274 | goto out; |
1da177e4 LT |
6275 | } |
6276 | ||
1ca69c4b N |
6277 | /* Some actions do not requires the mutex */ |
6278 | switch (cmd) { | |
6279 | case GET_ARRAY_INFO: | |
6280 | if (!mddev->raid_disks && !mddev->external) | |
6281 | err = -ENODEV; | |
6282 | else | |
6283 | err = get_array_info(mddev, argp); | |
3adc28d8 | 6284 | goto out; |
1ca69c4b N |
6285 | |
6286 | case GET_DISK_INFO: | |
6287 | if (!mddev->raid_disks && !mddev->external) | |
6288 | err = -ENODEV; | |
6289 | else | |
6290 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 6291 | goto out; |
1ca69c4b N |
6292 | |
6293 | case SET_DISK_FAULTY: | |
6294 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6295 | goto out; |
1ca69c4b N |
6296 | } |
6297 | ||
a7a3f08d N |
6298 | if (cmd == ADD_NEW_DISK) |
6299 | /* need to ensure md_delayed_delete() has completed */ | |
6300 | flush_workqueue(md_misc_wq); | |
6301 | ||
90f5f7ad HR |
6302 | if (cmd == HOT_REMOVE_DISK) |
6303 | /* need to ensure recovery thread has run */ | |
6304 | wait_event_interruptible_timeout(mddev->sb_wait, | |
6305 | !test_bit(MD_RECOVERY_NEEDED, | |
6306 | &mddev->flags), | |
6307 | msecs_to_jiffies(5000)); | |
260fa034 N |
6308 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
6309 | /* Need to flush page cache, and ensure no-one else opens | |
6310 | * and writes | |
6311 | */ | |
6312 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 6313 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
6314 | mutex_unlock(&mddev->open_mutex); |
6315 | err = -EBUSY; | |
3adc28d8 | 6316 | goto out; |
260fa034 N |
6317 | } |
6318 | set_bit(MD_STILL_CLOSED, &mddev->flags); | |
6319 | mutex_unlock(&mddev->open_mutex); | |
6320 | sync_blockdev(bdev); | |
6321 | } | |
1da177e4 LT |
6322 | err = mddev_lock(mddev); |
6323 | if (err) { | |
f72ffdd6 | 6324 | printk(KERN_INFO |
1da177e4 LT |
6325 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
6326 | err, cmd); | |
3adc28d8 | 6327 | goto out; |
1da177e4 LT |
6328 | } |
6329 | ||
c02c0aeb N |
6330 | if (cmd == SET_ARRAY_INFO) { |
6331 | mdu_array_info_t info; | |
6332 | if (!arg) | |
6333 | memset(&info, 0, sizeof(info)); | |
6334 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6335 | err = -EFAULT; | |
3adc28d8 | 6336 | goto unlock; |
c02c0aeb N |
6337 | } |
6338 | if (mddev->pers) { | |
6339 | err = update_array_info(mddev, &info); | |
6340 | if (err) { | |
6341 | printk(KERN_WARNING "md: couldn't update" | |
6342 | " array info. %d\n", err); | |
3adc28d8 | 6343 | goto unlock; |
1da177e4 | 6344 | } |
3adc28d8 | 6345 | goto unlock; |
c02c0aeb N |
6346 | } |
6347 | if (!list_empty(&mddev->disks)) { | |
6348 | printk(KERN_WARNING | |
6349 | "md: array %s already has disks!\n", | |
6350 | mdname(mddev)); | |
6351 | err = -EBUSY; | |
3adc28d8 | 6352 | goto unlock; |
c02c0aeb N |
6353 | } |
6354 | if (mddev->raid_disks) { | |
6355 | printk(KERN_WARNING | |
6356 | "md: array %s already initialised!\n", | |
6357 | mdname(mddev)); | |
6358 | err = -EBUSY; | |
3adc28d8 | 6359 | goto unlock; |
c02c0aeb N |
6360 | } |
6361 | err = set_array_info(mddev, &info); | |
6362 | if (err) { | |
6363 | printk(KERN_WARNING "md: couldn't set" | |
6364 | " array info. %d\n", err); | |
3adc28d8 | 6365 | goto unlock; |
c02c0aeb | 6366 | } |
3adc28d8 | 6367 | goto unlock; |
1da177e4 LT |
6368 | } |
6369 | ||
6370 | /* | |
6371 | * Commands querying/configuring an existing array: | |
6372 | */ | |
32a7627c | 6373 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6374 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6375 | if ((!mddev->raid_disks && !mddev->external) |
6376 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6377 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6378 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 6379 | err = -ENODEV; |
3adc28d8 | 6380 | goto unlock; |
1da177e4 LT |
6381 | } |
6382 | ||
6383 | /* | |
6384 | * Commands even a read-only array can execute: | |
6385 | */ | |
c02c0aeb N |
6386 | switch (cmd) { |
6387 | case GET_BITMAP_FILE: | |
6388 | err = get_bitmap_file(mddev, argp); | |
3adc28d8 | 6389 | goto unlock; |
32a7627c | 6390 | |
c02c0aeb N |
6391 | case RESTART_ARRAY_RW: |
6392 | err = restart_array(mddev); | |
3adc28d8 | 6393 | goto unlock; |
1da177e4 | 6394 | |
c02c0aeb N |
6395 | case STOP_ARRAY: |
6396 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 6397 | goto unlock; |
1da177e4 | 6398 | |
c02c0aeb N |
6399 | case STOP_ARRAY_RO: |
6400 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 6401 | goto unlock; |
1da177e4 | 6402 | |
3ea8929d N |
6403 | case HOT_REMOVE_DISK: |
6404 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6405 | goto unlock; |
3ea8929d | 6406 | |
7ceb17e8 N |
6407 | case ADD_NEW_DISK: |
6408 | /* We can support ADD_NEW_DISK on read-only arrays | |
6409 | * on if we are re-adding a preexisting device. | |
6410 | * So require mddev->pers and MD_DISK_SYNC. | |
6411 | */ | |
6412 | if (mddev->pers) { | |
6413 | mdu_disk_info_t info; | |
6414 | if (copy_from_user(&info, argp, sizeof(info))) | |
6415 | err = -EFAULT; | |
6416 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6417 | /* Need to clear read-only for this */ | |
6418 | break; | |
6419 | else | |
6420 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6421 | goto unlock; |
7ceb17e8 N |
6422 | } |
6423 | break; | |
6424 | ||
c02c0aeb N |
6425 | case BLKROSET: |
6426 | if (get_user(ro, (int __user *)(arg))) { | |
6427 | err = -EFAULT; | |
3adc28d8 | 6428 | goto unlock; |
c02c0aeb N |
6429 | } |
6430 | err = -EINVAL; | |
e2218350 | 6431 | |
c02c0aeb N |
6432 | /* if the bdev is going readonly the value of mddev->ro |
6433 | * does not matter, no writes are coming | |
6434 | */ | |
6435 | if (ro) | |
3adc28d8 | 6436 | goto unlock; |
e2218350 | 6437 | |
c02c0aeb N |
6438 | /* are we are already prepared for writes? */ |
6439 | if (mddev->ro != 1) | |
3adc28d8 | 6440 | goto unlock; |
e2218350 | 6441 | |
c02c0aeb N |
6442 | /* transitioning to readauto need only happen for |
6443 | * arrays that call md_write_start | |
6444 | */ | |
6445 | if (mddev->pers) { | |
6446 | err = restart_array(mddev); | |
6447 | if (err == 0) { | |
6448 | mddev->ro = 2; | |
6449 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6450 | } |
c02c0aeb | 6451 | } |
3adc28d8 | 6452 | goto unlock; |
1da177e4 LT |
6453 | } |
6454 | ||
6455 | /* | |
6456 | * The remaining ioctls are changing the state of the | |
f91de92e | 6457 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 6458 | */ |
326eb17d | 6459 | if (mddev->ro && mddev->pers) { |
f91de92e N |
6460 | if (mddev->ro == 2) { |
6461 | mddev->ro = 0; | |
00bcb4ac | 6462 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6463 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6464 | /* mddev_unlock will wake thread */ |
6465 | /* If a device failed while we were read-only, we | |
6466 | * need to make sure the metadata is updated now. | |
6467 | */ | |
6468 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6469 | mddev_unlock(mddev); | |
6470 | wait_event(mddev->sb_wait, | |
6471 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6472 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
29f097c4 | 6473 | mddev_lock_nointr(mddev); |
f3378b48 | 6474 | } |
f91de92e N |
6475 | } else { |
6476 | err = -EROFS; | |
3adc28d8 | 6477 | goto unlock; |
f91de92e | 6478 | } |
1da177e4 LT |
6479 | } |
6480 | ||
c02c0aeb N |
6481 | switch (cmd) { |
6482 | case ADD_NEW_DISK: | |
1da177e4 | 6483 | { |
c02c0aeb N |
6484 | mdu_disk_info_t info; |
6485 | if (copy_from_user(&info, argp, sizeof(info))) | |
6486 | err = -EFAULT; | |
6487 | else | |
6488 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6489 | goto unlock; |
c02c0aeb | 6490 | } |
1da177e4 | 6491 | |
c02c0aeb N |
6492 | case HOT_ADD_DISK: |
6493 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6494 | goto unlock; |
1da177e4 | 6495 | |
c02c0aeb N |
6496 | case RUN_ARRAY: |
6497 | err = do_md_run(mddev); | |
3adc28d8 | 6498 | goto unlock; |
1da177e4 | 6499 | |
c02c0aeb N |
6500 | case SET_BITMAP_FILE: |
6501 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 6502 | goto unlock; |
32a7627c | 6503 | |
c02c0aeb N |
6504 | default: |
6505 | err = -EINVAL; | |
3adc28d8 | 6506 | goto unlock; |
1da177e4 LT |
6507 | } |
6508 | ||
3adc28d8 | 6509 | unlock: |
d3374825 N |
6510 | if (mddev->hold_active == UNTIL_IOCTL && |
6511 | err != -EINVAL) | |
6512 | mddev->hold_active = 0; | |
1da177e4 | 6513 | mddev_unlock(mddev); |
3adc28d8 | 6514 | out: |
1da177e4 LT |
6515 | return err; |
6516 | } | |
aa98aa31 AB |
6517 | #ifdef CONFIG_COMPAT |
6518 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6519 | unsigned int cmd, unsigned long arg) | |
6520 | { | |
6521 | switch (cmd) { | |
6522 | case HOT_REMOVE_DISK: | |
6523 | case HOT_ADD_DISK: | |
6524 | case SET_DISK_FAULTY: | |
6525 | case SET_BITMAP_FILE: | |
6526 | /* These take in integer arg, do not convert */ | |
6527 | break; | |
6528 | default: | |
6529 | arg = (unsigned long)compat_ptr(arg); | |
6530 | break; | |
6531 | } | |
6532 | ||
6533 | return md_ioctl(bdev, mode, cmd, arg); | |
6534 | } | |
6535 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6536 | |
a39907fa | 6537 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6538 | { |
6539 | /* | |
6540 | * Succeed if we can lock the mddev, which confirms that | |
6541 | * it isn't being stopped right now. | |
6542 | */ | |
fd01b88c | 6543 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6544 | int err; |
6545 | ||
0c098220 YL |
6546 | if (!mddev) |
6547 | return -ENODEV; | |
6548 | ||
d3374825 N |
6549 | if (mddev->gendisk != bdev->bd_disk) { |
6550 | /* we are racing with mddev_put which is discarding this | |
6551 | * bd_disk. | |
6552 | */ | |
6553 | mddev_put(mddev); | |
6554 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6555 | flush_workqueue(md_misc_wq); |
d3374825 N |
6556 | /* Then retry the open from the top */ |
6557 | return -ERESTARTSYS; | |
6558 | } | |
6559 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6560 | ||
c8c00a69 | 6561 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6562 | goto out; |
6563 | ||
6564 | err = 0; | |
f2ea68cf | 6565 | atomic_inc(&mddev->openers); |
260fa034 | 6566 | clear_bit(MD_STILL_CLOSED, &mddev->flags); |
c8c00a69 | 6567 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6568 | |
f0b4f7e2 | 6569 | check_disk_change(bdev); |
1da177e4 LT |
6570 | out: |
6571 | return err; | |
6572 | } | |
6573 | ||
db2a144b | 6574 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6575 | { |
f72ffdd6 | 6576 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6577 | |
52e5f9d1 | 6578 | BUG_ON(!mddev); |
f2ea68cf | 6579 | atomic_dec(&mddev->openers); |
1da177e4 | 6580 | mddev_put(mddev); |
1da177e4 | 6581 | } |
f0b4f7e2 N |
6582 | |
6583 | static int md_media_changed(struct gendisk *disk) | |
6584 | { | |
fd01b88c | 6585 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6586 | |
6587 | return mddev->changed; | |
6588 | } | |
6589 | ||
6590 | static int md_revalidate(struct gendisk *disk) | |
6591 | { | |
fd01b88c | 6592 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6593 | |
6594 | mddev->changed = 0; | |
6595 | return 0; | |
6596 | } | |
83d5cde4 | 6597 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6598 | { |
6599 | .owner = THIS_MODULE, | |
a39907fa AV |
6600 | .open = md_open, |
6601 | .release = md_release, | |
b492b852 | 6602 | .ioctl = md_ioctl, |
aa98aa31 AB |
6603 | #ifdef CONFIG_COMPAT |
6604 | .compat_ioctl = md_compat_ioctl, | |
6605 | #endif | |
a885c8c4 | 6606 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6607 | .media_changed = md_media_changed, |
6608 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6609 | }; |
6610 | ||
f72ffdd6 | 6611 | static int md_thread(void *arg) |
1da177e4 | 6612 | { |
2b8bf345 | 6613 | struct md_thread *thread = arg; |
1da177e4 | 6614 | |
1da177e4 LT |
6615 | /* |
6616 | * md_thread is a 'system-thread', it's priority should be very | |
6617 | * high. We avoid resource deadlocks individually in each | |
6618 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6619 | * the very same RT priority as kswapd, thus we will never get | |
6620 | * into a priority inversion deadlock. | |
6621 | * | |
6622 | * we definitely have to have equal or higher priority than | |
6623 | * bdflush, otherwise bdflush will deadlock if there are too | |
6624 | * many dirty RAID5 blocks. | |
6625 | */ | |
1da177e4 | 6626 | |
6985c43f | 6627 | allow_signal(SIGKILL); |
a6fb0934 | 6628 | while (!kthread_should_stop()) { |
1da177e4 | 6629 | |
93588e22 N |
6630 | /* We need to wait INTERRUPTIBLE so that |
6631 | * we don't add to the load-average. | |
6632 | * That means we need to be sure no signals are | |
6633 | * pending | |
6634 | */ | |
6635 | if (signal_pending(current)) | |
6636 | flush_signals(current); | |
6637 | ||
6638 | wait_event_interruptible_timeout | |
6639 | (thread->wqueue, | |
6640 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6641 | || kthread_should_stop(), | |
6642 | thread->timeout); | |
1da177e4 | 6643 | |
6c987910 N |
6644 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6645 | if (!kthread_should_stop()) | |
4ed8731d | 6646 | thread->run(thread); |
1da177e4 | 6647 | } |
a6fb0934 | 6648 | |
1da177e4 LT |
6649 | return 0; |
6650 | } | |
6651 | ||
2b8bf345 | 6652 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
6653 | { |
6654 | if (thread) { | |
36a4e1fe | 6655 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
6656 | set_bit(THREAD_WAKEUP, &thread->flags); |
6657 | wake_up(&thread->wqueue); | |
6658 | } | |
6659 | } | |
6c144d31 | 6660 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 6661 | |
4ed8731d SL |
6662 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
6663 | struct mddev *mddev, const char *name) | |
1da177e4 | 6664 | { |
2b8bf345 | 6665 | struct md_thread *thread; |
1da177e4 | 6666 | |
2b8bf345 | 6667 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
6668 | if (!thread) |
6669 | return NULL; | |
6670 | ||
1da177e4 LT |
6671 | init_waitqueue_head(&thread->wqueue); |
6672 | ||
1da177e4 LT |
6673 | thread->run = run; |
6674 | thread->mddev = mddev; | |
32a7627c | 6675 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6676 | thread->tsk = kthread_run(md_thread, thread, |
6677 | "%s_%s", | |
6678 | mdname(thread->mddev), | |
0232605d | 6679 | name); |
a6fb0934 | 6680 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6681 | kfree(thread); |
6682 | return NULL; | |
6683 | } | |
1da177e4 LT |
6684 | return thread; |
6685 | } | |
6c144d31 | 6686 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 6687 | |
2b8bf345 | 6688 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 6689 | { |
2b8bf345 | 6690 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
6691 | if (!thread) |
6692 | return; | |
36a4e1fe | 6693 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
6694 | /* Locking ensures that mddev_unlock does not wake_up a |
6695 | * non-existent thread | |
6696 | */ | |
6697 | spin_lock(&pers_lock); | |
6698 | *threadp = NULL; | |
6699 | spin_unlock(&pers_lock); | |
a6fb0934 N |
6700 | |
6701 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6702 | kfree(thread); |
6703 | } | |
6c144d31 | 6704 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 6705 | |
fd01b88c | 6706 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 6707 | { |
b2d444d7 | 6708 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6709 | return; |
6bfe0b49 | 6710 | |
de393cde | 6711 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
6712 | return; |
6713 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6714 | if (mddev->degraded) |
6715 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6716 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6717 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6718 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6719 | md_wakeup_thread(mddev->thread); | |
768a418d | 6720 | if (mddev->event_work.func) |
e804ac78 | 6721 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6722 | md_new_event_inintr(mddev); |
1da177e4 | 6723 | } |
6c144d31 | 6724 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
6725 | |
6726 | /* seq_file implementation /proc/mdstat */ | |
6727 | ||
6728 | static void status_unused(struct seq_file *seq) | |
6729 | { | |
6730 | int i = 0; | |
3cb03002 | 6731 | struct md_rdev *rdev; |
1da177e4 LT |
6732 | |
6733 | seq_printf(seq, "unused devices: "); | |
6734 | ||
159ec1fc | 6735 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6736 | char b[BDEVNAME_SIZE]; |
6737 | i++; | |
6738 | seq_printf(seq, "%s ", | |
6739 | bdevname(rdev->bdev,b)); | |
6740 | } | |
6741 | if (!i) | |
6742 | seq_printf(seq, "<none>"); | |
6743 | ||
6744 | seq_printf(seq, "\n"); | |
6745 | } | |
6746 | ||
f72ffdd6 | 6747 | static void status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 6748 | { |
dd71cf6b N |
6749 | sector_t max_sectors, resync, res; |
6750 | unsigned long dt, db; | |
6751 | sector_t rt; | |
4588b42e N |
6752 | int scale; |
6753 | unsigned int per_milli; | |
1da177e4 | 6754 | |
72f36d59 N |
6755 | if (mddev->curr_resync <= 3) |
6756 | resync = 0; | |
6757 | else | |
6758 | resync = mddev->curr_resync | |
6759 | - atomic_read(&mddev->recovery_active); | |
1da177e4 | 6760 | |
c804cdec N |
6761 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
6762 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 6763 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6764 | else |
dd71cf6b | 6765 | max_sectors = mddev->dev_sectors; |
1da177e4 | 6766 | |
403df478 | 6767 | WARN_ON(max_sectors == 0); |
4588b42e | 6768 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6769 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6770 | * u32, as those are the requirements for sector_div. |
6771 | * Thus 'scale' must be at least 10 | |
6772 | */ | |
6773 | scale = 10; | |
6774 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6775 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6776 | scale++; |
6777 | } | |
6778 | res = (resync>>scale)*1000; | |
dd71cf6b | 6779 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6780 | |
6781 | per_milli = res; | |
1da177e4 | 6782 | { |
4588b42e | 6783 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6784 | seq_printf(seq, "["); |
6785 | for (i = 0; i < x; i++) | |
6786 | seq_printf(seq, "="); | |
6787 | seq_printf(seq, ">"); | |
6788 | for (i = 0; i < y; i++) | |
6789 | seq_printf(seq, "."); | |
6790 | seq_printf(seq, "] "); | |
6791 | } | |
4588b42e | 6792 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6793 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6794 | "reshape" : | |
61df9d91 N |
6795 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6796 | "check" : | |
6797 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6798 | "resync" : "recovery"))), | |
6799 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6800 | (unsigned long long) resync/2, |
6801 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6802 | |
6803 | /* | |
1da177e4 LT |
6804 | * dt: time from mark until now |
6805 | * db: blocks written from mark until now | |
6806 | * rt: remaining time | |
dd71cf6b N |
6807 | * |
6808 | * rt is a sector_t, so could be 32bit or 64bit. | |
6809 | * So we divide before multiply in case it is 32bit and close | |
6810 | * to the limit. | |
25985edc | 6811 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6812 | * near the end of resync when the number of remaining sectors |
6813 | * is close to 'db'. | |
6814 | * We then divide rt by 32 after multiplying by db to compensate. | |
6815 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6816 | */ |
6817 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6818 | if (!dt) dt++; | |
ff4e8d9a N |
6819 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6820 | - mddev->resync_mark_cnt; | |
1da177e4 | 6821 | |
dd71cf6b N |
6822 | rt = max_sectors - resync; /* number of remaining sectors */ |
6823 | sector_div(rt, db/32+1); | |
6824 | rt *= dt; | |
6825 | rt >>= 5; | |
6826 | ||
6827 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6828 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6829 | |
ff4e8d9a | 6830 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6831 | } |
6832 | ||
6833 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6834 | { | |
6835 | struct list_head *tmp; | |
6836 | loff_t l = *pos; | |
fd01b88c | 6837 | struct mddev *mddev; |
1da177e4 LT |
6838 | |
6839 | if (l >= 0x10000) | |
6840 | return NULL; | |
6841 | if (!l--) | |
6842 | /* header */ | |
6843 | return (void*)1; | |
6844 | ||
6845 | spin_lock(&all_mddevs_lock); | |
6846 | list_for_each(tmp,&all_mddevs) | |
6847 | if (!l--) { | |
fd01b88c | 6848 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
6849 | mddev_get(mddev); |
6850 | spin_unlock(&all_mddevs_lock); | |
6851 | return mddev; | |
6852 | } | |
6853 | spin_unlock(&all_mddevs_lock); | |
6854 | if (!l--) | |
6855 | return (void*)2;/* tail */ | |
6856 | return NULL; | |
6857 | } | |
6858 | ||
6859 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6860 | { | |
6861 | struct list_head *tmp; | |
fd01b88c | 6862 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 6863 | |
1da177e4 LT |
6864 | ++*pos; |
6865 | if (v == (void*)2) | |
6866 | return NULL; | |
6867 | ||
6868 | spin_lock(&all_mddevs_lock); | |
6869 | if (v == (void*)1) | |
6870 | tmp = all_mddevs.next; | |
6871 | else | |
6872 | tmp = mddev->all_mddevs.next; | |
6873 | if (tmp != &all_mddevs) | |
fd01b88c | 6874 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
6875 | else { |
6876 | next_mddev = (void*)2; | |
6877 | *pos = 0x10000; | |
f72ffdd6 | 6878 | } |
1da177e4 LT |
6879 | spin_unlock(&all_mddevs_lock); |
6880 | ||
6881 | if (v != (void*)1) | |
6882 | mddev_put(mddev); | |
6883 | return next_mddev; | |
6884 | ||
6885 | } | |
6886 | ||
6887 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6888 | { | |
fd01b88c | 6889 | struct mddev *mddev = v; |
1da177e4 LT |
6890 | |
6891 | if (mddev && v != (void*)1 && v != (void*)2) | |
6892 | mddev_put(mddev); | |
6893 | } | |
6894 | ||
6895 | static int md_seq_show(struct seq_file *seq, void *v) | |
6896 | { | |
fd01b88c | 6897 | struct mddev *mddev = v; |
dd8ac336 | 6898 | sector_t sectors; |
3cb03002 | 6899 | struct md_rdev *rdev; |
1da177e4 LT |
6900 | |
6901 | if (v == (void*)1) { | |
84fc4b56 | 6902 | struct md_personality *pers; |
1da177e4 LT |
6903 | seq_printf(seq, "Personalities : "); |
6904 | spin_lock(&pers_lock); | |
2604b703 N |
6905 | list_for_each_entry(pers, &pers_list, list) |
6906 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6907 | |
6908 | spin_unlock(&pers_lock); | |
6909 | seq_printf(seq, "\n"); | |
f1514638 | 6910 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
6911 | return 0; |
6912 | } | |
6913 | if (v == (void*)2) { | |
6914 | status_unused(seq); | |
6915 | return 0; | |
6916 | } | |
6917 | ||
5dc5cf7d | 6918 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6919 | return -EINTR; |
5dc5cf7d | 6920 | |
1da177e4 LT |
6921 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6922 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6923 | mddev->pers ? "" : "in"); | |
6924 | if (mddev->pers) { | |
f91de92e | 6925 | if (mddev->ro==1) |
1da177e4 | 6926 | seq_printf(seq, " (read-only)"); |
f91de92e | 6927 | if (mddev->ro==2) |
52720ae7 | 6928 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6929 | seq_printf(seq, " %s", mddev->pers->name); |
6930 | } | |
6931 | ||
dd8ac336 | 6932 | sectors = 0; |
dafb20fa | 6933 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
6934 | char b[BDEVNAME_SIZE]; |
6935 | seq_printf(seq, " %s[%d]", | |
6936 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6937 | if (test_bit(WriteMostly, &rdev->flags)) |
6938 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6939 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6940 | seq_printf(seq, "(F)"); |
6941 | continue; | |
2d78f8c4 N |
6942 | } |
6943 | if (rdev->raid_disk < 0) | |
b325a32e | 6944 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
6945 | if (test_bit(Replacement, &rdev->flags)) |
6946 | seq_printf(seq, "(R)"); | |
dd8ac336 | 6947 | sectors += rdev->sectors; |
1da177e4 LT |
6948 | } |
6949 | ||
6950 | if (!list_empty(&mddev->disks)) { | |
6951 | if (mddev->pers) | |
6952 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6953 | (unsigned long long) |
6954 | mddev->array_sectors / 2); | |
1da177e4 LT |
6955 | else |
6956 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6957 | (unsigned long long)sectors / 2); |
1da177e4 | 6958 | } |
1cd6bf19 N |
6959 | if (mddev->persistent) { |
6960 | if (mddev->major_version != 0 || | |
6961 | mddev->minor_version != 90) { | |
6962 | seq_printf(seq," super %d.%d", | |
6963 | mddev->major_version, | |
6964 | mddev->minor_version); | |
6965 | } | |
e691063a N |
6966 | } else if (mddev->external) |
6967 | seq_printf(seq, " super external:%s", | |
6968 | mddev->metadata_type); | |
6969 | else | |
1cd6bf19 | 6970 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6971 | |
6972 | if (mddev->pers) { | |
d710e138 | 6973 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 6974 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6975 | if (mddev->pers->sync_request) { |
6976 | if (mddev->curr_resync > 2) { | |
d710e138 | 6977 | status_resync(seq, mddev); |
8e1b39d6 | 6978 | seq_printf(seq, "\n "); |
72f36d59 | 6979 | } else if (mddev->curr_resync >= 1) |
8e1b39d6 N |
6980 | seq_printf(seq, "\tresync=DELAYED\n "); |
6981 | else if (mddev->recovery_cp < MaxSector) | |
6982 | seq_printf(seq, "\tresync=PENDING\n "); | |
6983 | } | |
32a7627c N |
6984 | } else |
6985 | seq_printf(seq, "\n "); | |
6986 | ||
57148964 | 6987 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
6988 | |
6989 | seq_printf(seq, "\n"); | |
6990 | } | |
6991 | mddev_unlock(mddev); | |
f72ffdd6 | 6992 | |
1da177e4 LT |
6993 | return 0; |
6994 | } | |
6995 | ||
110518bc | 6996 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6997 | .start = md_seq_start, |
6998 | .next = md_seq_next, | |
6999 | .stop = md_seq_stop, | |
7000 | .show = md_seq_show, | |
7001 | }; | |
7002 | ||
7003 | static int md_seq_open(struct inode *inode, struct file *file) | |
7004 | { | |
f1514638 | 7005 | struct seq_file *seq; |
1da177e4 LT |
7006 | int error; |
7007 | ||
7008 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7009 | if (error) |
f1514638 KS |
7010 | return error; |
7011 | ||
7012 | seq = file->private_data; | |
7013 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7014 | return error; |
7015 | } | |
7016 | ||
e2f23b60 | 7017 | static int md_unloading; |
d7603b7e N |
7018 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7019 | { | |
f1514638 | 7020 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7021 | int mask; |
7022 | ||
e2f23b60 | 7023 | if (md_unloading) |
7d7e64f2 | 7024 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7025 | poll_wait(filp, &md_event_waiters, wait); |
7026 | ||
7027 | /* always allow read */ | |
7028 | mask = POLLIN | POLLRDNORM; | |
7029 | ||
f1514638 | 7030 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7031 | mask |= POLLERR | POLLPRI; |
7032 | return mask; | |
7033 | } | |
7034 | ||
fa027c2a | 7035 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7036 | .owner = THIS_MODULE, |
1da177e4 LT |
7037 | .open = md_seq_open, |
7038 | .read = seq_read, | |
7039 | .llseek = seq_lseek, | |
c3f94b40 | 7040 | .release = seq_release_private, |
d7603b7e | 7041 | .poll = mdstat_poll, |
1da177e4 LT |
7042 | }; |
7043 | ||
84fc4b56 | 7044 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7045 | { |
50bd3774 CY |
7046 | printk(KERN_INFO "md: %s personality registered for level %d\n", |
7047 | p->name, p->level); | |
1da177e4 | 7048 | spin_lock(&pers_lock); |
2604b703 | 7049 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7050 | spin_unlock(&pers_lock); |
7051 | return 0; | |
7052 | } | |
6c144d31 | 7053 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7054 | |
84fc4b56 | 7055 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7056 | { |
2604b703 | 7057 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7058 | spin_lock(&pers_lock); |
2604b703 | 7059 | list_del_init(&p->list); |
1da177e4 LT |
7060 | spin_unlock(&pers_lock); |
7061 | return 0; | |
7062 | } | |
6c144d31 | 7063 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7064 | |
fd01b88c | 7065 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7066 | { |
f72ffdd6 | 7067 | struct md_rdev *rdev; |
1da177e4 | 7068 | int idle; |
eea1bf38 | 7069 | int curr_events; |
1da177e4 LT |
7070 | |
7071 | idle = 1; | |
4b80991c N |
7072 | rcu_read_lock(); |
7073 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7074 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7075 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7076 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7077 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7078 | /* sync IO will cause sync_io to increase before the disk_stats |
7079 | * as sync_io is counted when a request starts, and | |
7080 | * disk_stats is counted when it completes. | |
7081 | * So resync activity will cause curr_events to be smaller than | |
7082 | * when there was no such activity. | |
7083 | * non-sync IO will cause disk_stat to increase without | |
7084 | * increasing sync_io so curr_events will (eventually) | |
7085 | * be larger than it was before. Once it becomes | |
7086 | * substantially larger, the test below will cause | |
7087 | * the array to appear non-idle, and resync will slow | |
7088 | * down. | |
7089 | * If there is a lot of outstanding resync activity when | |
7090 | * we set last_event to curr_events, then all that activity | |
7091 | * completing might cause the array to appear non-idle | |
7092 | * and resync will be slowed down even though there might | |
7093 | * not have been non-resync activity. This will only | |
7094 | * happen once though. 'last_events' will soon reflect | |
7095 | * the state where there is little or no outstanding | |
7096 | * resync requests, and further resync activity will | |
7097 | * always make curr_events less than last_events. | |
c0e48521 | 7098 | * |
1da177e4 | 7099 | */ |
eea1bf38 | 7100 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7101 | rdev->last_events = curr_events; |
7102 | idle = 0; | |
7103 | } | |
7104 | } | |
4b80991c | 7105 | rcu_read_unlock(); |
1da177e4 LT |
7106 | return idle; |
7107 | } | |
7108 | ||
fd01b88c | 7109 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7110 | { |
7111 | /* another "blocks" (512byte) blocks have been synced */ | |
7112 | atomic_sub(blocks, &mddev->recovery_active); | |
7113 | wake_up(&mddev->recovery_wait); | |
7114 | if (!ok) { | |
dfc70645 | 7115 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7116 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7117 | md_wakeup_thread(mddev->thread); |
7118 | // stop recovery, signal do_sync .... | |
7119 | } | |
7120 | } | |
6c144d31 | 7121 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 7122 | |
06d91a5f N |
7123 | /* md_write_start(mddev, bi) |
7124 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7125 | * in superblock) before writing, schedule a superblock update |
7126 | * and wait for it to complete. | |
06d91a5f | 7127 | */ |
fd01b88c | 7128 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7129 | { |
0fd62b86 | 7130 | int did_change = 0; |
06d91a5f | 7131 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7132 | return; |
06d91a5f | 7133 | |
f91de92e N |
7134 | BUG_ON(mddev->ro == 1); |
7135 | if (mddev->ro == 2) { | |
7136 | /* need to switch to read/write */ | |
7137 | mddev->ro = 0; | |
7138 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7139 | md_wakeup_thread(mddev->thread); | |
25156198 | 7140 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7141 | did_change = 1; |
f91de92e | 7142 | } |
06d91a5f | 7143 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7144 | if (mddev->safemode == 1) |
7145 | mddev->safemode = 0; | |
06d91a5f | 7146 | if (mddev->in_sync) { |
85572d7c | 7147 | spin_lock(&mddev->lock); |
3d310eb7 N |
7148 | if (mddev->in_sync) { |
7149 | mddev->in_sync = 0; | |
850b2b42 | 7150 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7151 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7152 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7153 | did_change = 1; |
3d310eb7 | 7154 | } |
85572d7c | 7155 | spin_unlock(&mddev->lock); |
06d91a5f | 7156 | } |
0fd62b86 | 7157 | if (did_change) |
00bcb4ac | 7158 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7159 | wait_event(mddev->sb_wait, |
09a44cc1 | 7160 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 | 7161 | } |
6c144d31 | 7162 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 7163 | |
fd01b88c | 7164 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7165 | { |
7166 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7167 | if (mddev->safemode == 2) | |
7168 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7169 | else if (mddev->safemode_delay) |
1da177e4 LT |
7170 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7171 | } | |
7172 | } | |
6c144d31 | 7173 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 7174 | |
2a2275d6 N |
7175 | /* md_allow_write(mddev) |
7176 | * Calling this ensures that the array is marked 'active' so that writes | |
7177 | * may proceed without blocking. It is important to call this before | |
7178 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7179 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7180 | * |
7181 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7182 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7183 | */ |
fd01b88c | 7184 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7185 | { |
7186 | if (!mddev->pers) | |
b5470dc5 | 7187 | return 0; |
2a2275d6 | 7188 | if (mddev->ro) |
b5470dc5 | 7189 | return 0; |
1a0fd497 | 7190 | if (!mddev->pers->sync_request) |
b5470dc5 | 7191 | return 0; |
2a2275d6 | 7192 | |
85572d7c | 7193 | spin_lock(&mddev->lock); |
2a2275d6 N |
7194 | if (mddev->in_sync) { |
7195 | mddev->in_sync = 0; | |
7196 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7197 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7198 | if (mddev->safemode_delay && |
7199 | mddev->safemode == 0) | |
7200 | mddev->safemode = 1; | |
85572d7c | 7201 | spin_unlock(&mddev->lock); |
2a2275d6 | 7202 | md_update_sb(mddev, 0); |
00bcb4ac | 7203 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 | 7204 | } else |
85572d7c | 7205 | spin_unlock(&mddev->lock); |
b5470dc5 | 7206 | |
070dc6dd | 7207 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7208 | return -EAGAIN; |
7209 | else | |
7210 | return 0; | |
2a2275d6 N |
7211 | } |
7212 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7213 | ||
1da177e4 LT |
7214 | #define SYNC_MARKS 10 |
7215 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7216 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7217 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7218 | { |
4ed8731d | 7219 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7220 | struct mddev *mddev2; |
1da177e4 LT |
7221 | unsigned int currspeed = 0, |
7222 | window; | |
ac7e50a3 | 7223 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 7224 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7225 | unsigned long update_time; |
1da177e4 LT |
7226 | sector_t mark_cnt[SYNC_MARKS]; |
7227 | int last_mark,m; | |
7228 | struct list_head *tmp; | |
7229 | sector_t last_check; | |
57afd89f | 7230 | int skipped = 0; |
3cb03002 | 7231 | struct md_rdev *rdev; |
c4a39551 | 7232 | char *desc, *action = NULL; |
7c2c57c9 | 7233 | struct blk_plug plug; |
1da177e4 LT |
7234 | |
7235 | /* just incase thread restarts... */ | |
7236 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7237 | return; | |
3991b31e N |
7238 | if (mddev->ro) {/* never try to sync a read-only array */ |
7239 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 7240 | return; |
3991b31e | 7241 | } |
1da177e4 | 7242 | |
61df9d91 | 7243 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 7244 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 7245 | desc = "data-check"; |
c4a39551 JB |
7246 | action = "check"; |
7247 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 7248 | desc = "requested-resync"; |
c4a39551 JB |
7249 | action = "repair"; |
7250 | } else | |
61df9d91 N |
7251 | desc = "resync"; |
7252 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7253 | desc = "reshape"; | |
7254 | else | |
7255 | desc = "recovery"; | |
7256 | ||
c4a39551 JB |
7257 | mddev->last_sync_action = action ?: desc; |
7258 | ||
1da177e4 LT |
7259 | /* we overload curr_resync somewhat here. |
7260 | * 0 == not engaged in resync at all | |
7261 | * 2 == checking that there is no conflict with another sync | |
7262 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7263 | * commense | |
7264 | * other == active in resync - this many blocks | |
7265 | * | |
7266 | * Before starting a resync we must have set curr_resync to | |
7267 | * 2, and then checked that every "conflicting" array has curr_resync | |
7268 | * less than ours. When we find one that is the same or higher | |
7269 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7270 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7271 | * This will mean we have to start checking from the beginning again. | |
7272 | * | |
7273 | */ | |
7274 | ||
7275 | do { | |
7276 | mddev->curr_resync = 2; | |
7277 | ||
7278 | try_again: | |
404e4b43 | 7279 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 7280 | goto skip; |
29ac4aa3 | 7281 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7282 | if (mddev2 == mddev) |
7283 | continue; | |
90b08710 BS |
7284 | if (!mddev->parallel_resync |
7285 | && mddev2->curr_resync | |
7286 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7287 | DEFINE_WAIT(wq); |
7288 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7289 | /* arbitrarily yield */ | |
7290 | mddev->curr_resync = 1; | |
7291 | wake_up(&resync_wait); | |
7292 | } | |
7293 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7294 | /* no need to wait here, we can wait the next | |
7295 | * time 'round when curr_resync == 2 | |
7296 | */ | |
7297 | continue; | |
9744197c N |
7298 | /* We need to wait 'interruptible' so as not to |
7299 | * contribute to the load average, and not to | |
7300 | * be caught by 'softlockup' | |
7301 | */ | |
7302 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 7303 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 7304 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7305 | printk(KERN_INFO "md: delaying %s of %s" |
7306 | " until %s has finished (they" | |
1da177e4 | 7307 | " share one or more physical units)\n", |
61df9d91 | 7308 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7309 | mddev_put(mddev2); |
9744197c N |
7310 | if (signal_pending(current)) |
7311 | flush_signals(current); | |
1da177e4 LT |
7312 | schedule(); |
7313 | finish_wait(&resync_wait, &wq); | |
7314 | goto try_again; | |
7315 | } | |
7316 | finish_wait(&resync_wait, &wq); | |
7317 | } | |
7318 | } | |
7319 | } while (mddev->curr_resync < 2); | |
7320 | ||
5fd6c1dc | 7321 | j = 0; |
9d88883e | 7322 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7323 | /* resync follows the size requested by the personality, |
57afd89f | 7324 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7325 | */ |
7326 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7327 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7328 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7329 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7330 | j = mddev->resync_min; | |
7331 | else if (!mddev->bitmap) | |
5fd6c1dc | 7332 | j = mddev->recovery_cp; |
5e96ee65 | 7333 | |
ccfcc3c1 | 7334 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7335 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7336 | else { |
1da177e4 | 7337 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7338 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7339 | j = MaxSector; |
4e59ca7d | 7340 | rcu_read_lock(); |
dafb20fa | 7341 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc N |
7342 | if (rdev->raid_disk >= 0 && |
7343 | !test_bit(Faulty, &rdev->flags) && | |
7344 | !test_bit(In_sync, &rdev->flags) && | |
7345 | rdev->recovery_offset < j) | |
7346 | j = rdev->recovery_offset; | |
4e59ca7d | 7347 | rcu_read_unlock(); |
133d4527 N |
7348 | |
7349 | /* If there is a bitmap, we need to make sure all | |
7350 | * writes that started before we added a spare | |
7351 | * complete before we start doing a recovery. | |
7352 | * Otherwise the write might complete and (via | |
7353 | * bitmap_endwrite) set a bit in the bitmap after the | |
7354 | * recovery has checked that bit and skipped that | |
7355 | * region. | |
7356 | */ | |
7357 | if (mddev->bitmap) { | |
7358 | mddev->pers->quiesce(mddev, 1); | |
7359 | mddev->pers->quiesce(mddev, 0); | |
7360 | } | |
5fd6c1dc | 7361 | } |
1da177e4 | 7362 | |
61df9d91 N |
7363 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7364 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7365 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7366 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7367 | "(but not more than %d KB/sec) for %s.\n", |
7368 | speed_max(mddev), desc); | |
1da177e4 | 7369 | |
eea1bf38 | 7370 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7371 | |
57afd89f | 7372 | io_sectors = 0; |
1da177e4 LT |
7373 | for (m = 0; m < SYNC_MARKS; m++) { |
7374 | mark[m] = jiffies; | |
57afd89f | 7375 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7376 | } |
7377 | last_mark = 0; | |
7378 | mddev->resync_mark = mark[last_mark]; | |
7379 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7380 | ||
7381 | /* | |
7382 | * Tune reconstruction: | |
7383 | */ | |
7384 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7385 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7386 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7387 | |
7388 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7389 | last_check = 0; |
7390 | ||
7391 | if (j>2) { | |
c91abf5a | 7392 | printk(KERN_INFO |
61df9d91 N |
7393 | "md: resuming %s of %s from checkpoint.\n", |
7394 | desc, mdname(mddev)); | |
1da177e4 | 7395 | mddev->curr_resync = j; |
72f36d59 N |
7396 | } else |
7397 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7398 | mddev->curr_resync_completed = j; |
72f36d59 N |
7399 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7400 | md_new_event(mddev); | |
54f89341 | 7401 | update_time = jiffies; |
1da177e4 | 7402 | |
7c2c57c9 | 7403 | blk_start_plug(&plug); |
1da177e4 | 7404 | while (j < max_sectors) { |
57afd89f | 7405 | sector_t sectors; |
1da177e4 | 7406 | |
57afd89f | 7407 | skipped = 0; |
97e4f42d | 7408 | |
7a91ee1f N |
7409 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7410 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7411 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7412 | > (max_sectors >> 4)) || | |
54f89341 | 7413 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f N |
7414 | (j - mddev->curr_resync_completed)*2 |
7415 | >= mddev->resync_max - mddev->curr_resync_completed | |
7416 | )) { | |
97e4f42d | 7417 | /* time to update curr_resync_completed */ |
97e4f42d N |
7418 | wait_event(mddev->recovery_wait, |
7419 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7420 | mddev->curr_resync_completed = j; |
35d78c66 | 7421 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
7422 | j > mddev->recovery_cp) | |
7423 | mddev->recovery_cp = j; | |
54f89341 | 7424 | update_time = jiffies; |
070dc6dd | 7425 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7426 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7427 | } |
acb180b0 | 7428 | |
c91abf5a N |
7429 | while (j >= mddev->resync_max && |
7430 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
7431 | /* As this condition is controlled by user-space, |
7432 | * we can block indefinitely, so use '_interruptible' | |
7433 | * to avoid triggering warnings. | |
7434 | */ | |
7435 | flush_signals(current); /* just in case */ | |
7436 | wait_event_interruptible(mddev->recovery_wait, | |
7437 | mddev->resync_max > j | |
c91abf5a N |
7438 | || test_bit(MD_RECOVERY_INTR, |
7439 | &mddev->recovery)); | |
e62e58a5 | 7440 | } |
acb180b0 | 7441 | |
c91abf5a N |
7442 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7443 | break; | |
acb180b0 | 7444 | |
57afd89f | 7445 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7446 | currspeed < speed_min(mddev)); |
57afd89f | 7447 | if (sectors == 0) { |
dfc70645 | 7448 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 7449 | break; |
1da177e4 | 7450 | } |
57afd89f N |
7451 | |
7452 | if (!skipped) { /* actual IO requested */ | |
7453 | io_sectors += sectors; | |
7454 | atomic_add(sectors, &mddev->recovery_active); | |
7455 | } | |
7456 | ||
e875ecea N |
7457 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7458 | break; | |
7459 | ||
1da177e4 | 7460 | j += sectors; |
72f36d59 N |
7461 | if (j > 2) |
7462 | mddev->curr_resync = j; | |
ff4e8d9a | 7463 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7464 | if (last_check == 0) |
e875ecea | 7465 | /* this is the earliest that rebuild will be |
d7603b7e N |
7466 | * visible in /proc/mdstat |
7467 | */ | |
7468 | md_new_event(mddev); | |
57afd89f N |
7469 | |
7470 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7471 | continue; |
7472 | ||
57afd89f | 7473 | last_check = io_sectors; |
1da177e4 LT |
7474 | repeat: |
7475 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7476 | /* step marks */ | |
7477 | int next = (last_mark+1) % SYNC_MARKS; | |
7478 | ||
7479 | mddev->resync_mark = mark[next]; | |
7480 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7481 | mark[next] = jiffies; | |
57afd89f | 7482 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7483 | last_mark = next; |
7484 | } | |
7485 | ||
c91abf5a N |
7486 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7487 | break; | |
1da177e4 LT |
7488 | |
7489 | /* | |
7490 | * this loop exits only if either when we are slower than | |
7491 | * the 'hard' speed limit, or the system was IO-idle for | |
7492 | * a jiffy. | |
7493 | * the system might be non-idle CPU-wise, but we only care | |
7494 | * about not overloading the IO subsystem. (things like an | |
7495 | * e2fsck being done on the RAID array should execute fast) | |
7496 | */ | |
1da177e4 LT |
7497 | cond_resched(); |
7498 | ||
ac7e50a3 XN |
7499 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
7500 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 7501 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 7502 | |
88202a0c N |
7503 | if (currspeed > speed_min(mddev)) { |
7504 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7505 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7506 | msleep(500); |
1da177e4 LT |
7507 | goto repeat; |
7508 | } | |
7509 | } | |
7510 | } | |
c91abf5a N |
7511 | printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
7512 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
7513 | ? "interrupted" : "done"); | |
1da177e4 LT |
7514 | /* |
7515 | * this also signals 'finished resyncing' to md_stop | |
7516 | */ | |
7c2c57c9 | 7517 | blk_finish_plug(&plug); |
1da177e4 LT |
7518 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7519 | ||
7520 | /* tell personality that we are finished */ | |
57afd89f | 7521 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7522 | |
dfc70645 | 7523 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7524 | mddev->curr_resync > 2) { |
7525 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7526 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7527 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7528 | printk(KERN_INFO | |
61df9d91 N |
7529 | "md: checkpointing %s of %s.\n", |
7530 | desc, mdname(mddev)); | |
0a19caab | 7531 | if (test_bit(MD_RECOVERY_ERROR, |
7532 | &mddev->recovery)) | |
7533 | mddev->recovery_cp = | |
7534 | mddev->curr_resync_completed; | |
7535 | else | |
7536 | mddev->recovery_cp = | |
7537 | mddev->curr_resync; | |
5fd6c1dc N |
7538 | } |
7539 | } else | |
7540 | mddev->recovery_cp = MaxSector; | |
7541 | } else { | |
7542 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7543 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 7544 | rcu_read_lock(); |
dafb20fa | 7545 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7546 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7547 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7548 | !test_bit(Faulty, &rdev->flags) && |
7549 | !test_bit(In_sync, &rdev->flags) && | |
7550 | rdev->recovery_offset < mddev->curr_resync) | |
7551 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7552 | rcu_read_unlock(); |
5fd6c1dc | 7553 | } |
1da177e4 | 7554 | } |
db91ff55 | 7555 | skip: |
17571284 | 7556 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7557 | |
c07b70ad N |
7558 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7559 | /* We completed so min/max setting can be forgotten if used. */ | |
7560 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7561 | mddev->resync_min = 0; | |
7562 | mddev->resync_max = MaxSector; | |
7563 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7564 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7565 | mddev->curr_resync = 0; |
7566 | wake_up(&resync_wait); | |
7567 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7568 | md_wakeup_thread(mddev->thread); | |
c6207277 | 7569 | return; |
1da177e4 | 7570 | } |
29269553 | 7571 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7572 | |
746d3207 N |
7573 | static int remove_and_add_spares(struct mddev *mddev, |
7574 | struct md_rdev *this) | |
b4c4c7b8 | 7575 | { |
3cb03002 | 7576 | struct md_rdev *rdev; |
b4c4c7b8 | 7577 | int spares = 0; |
f2a371c5 | 7578 | int removed = 0; |
b4c4c7b8 | 7579 | |
dafb20fa | 7580 | rdev_for_each(rdev, mddev) |
746d3207 N |
7581 | if ((this == NULL || rdev == this) && |
7582 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 7583 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7584 | (test_bit(Faulty, &rdev->flags) || |
7585 | ! test_bit(In_sync, &rdev->flags)) && | |
7586 | atomic_read(&rdev->nr_pending)==0) { | |
7587 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7588 | mddev, rdev) == 0) { |
36fad858 | 7589 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 7590 | rdev->raid_disk = -1; |
f2a371c5 | 7591 | removed++; |
b4c4c7b8 N |
7592 | } |
7593 | } | |
90584fc9 JB |
7594 | if (removed && mddev->kobj.sd) |
7595 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 7596 | |
746d3207 N |
7597 | if (this) |
7598 | goto no_add; | |
7599 | ||
dafb20fa | 7600 | rdev_for_each(rdev, mddev) { |
7bfec5f3 N |
7601 | if (rdev->raid_disk >= 0 && |
7602 | !test_bit(In_sync, &rdev->flags) && | |
7603 | !test_bit(Faulty, &rdev->flags)) | |
7604 | spares++; | |
7ceb17e8 N |
7605 | if (rdev->raid_disk >= 0) |
7606 | continue; | |
7607 | if (test_bit(Faulty, &rdev->flags)) | |
7608 | continue; | |
7609 | if (mddev->ro && | |
8313b8e5 N |
7610 | ! (rdev->saved_raid_disk >= 0 && |
7611 | !test_bit(Bitmap_sync, &rdev->flags))) | |
7ceb17e8 N |
7612 | continue; |
7613 | ||
7eb41885 N |
7614 | if (rdev->saved_raid_disk < 0) |
7615 | rdev->recovery_offset = 0; | |
7ceb17e8 N |
7616 | if (mddev->pers-> |
7617 | hot_add_disk(mddev, rdev) == 0) { | |
7618 | if (sysfs_link_rdev(mddev, rdev)) | |
7619 | /* failure here is OK */; | |
7620 | spares++; | |
7621 | md_new_event(mddev); | |
7622 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 7623 | } |
b4c4c7b8 | 7624 | } |
746d3207 | 7625 | no_add: |
6dafab6b N |
7626 | if (removed) |
7627 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
7628 | return spares; |
7629 | } | |
7ebc0be7 | 7630 | |
ac05f256 N |
7631 | static void md_start_sync(struct work_struct *ws) |
7632 | { | |
7633 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
7634 | ||
7635 | mddev->sync_thread = md_register_thread(md_do_sync, | |
7636 | mddev, | |
7637 | "resync"); | |
7638 | if (!mddev->sync_thread) { | |
7639 | printk(KERN_ERR "%s: could not start resync" | |
7640 | " thread...\n", | |
7641 | mdname(mddev)); | |
7642 | /* leave the spares where they are, it shouldn't hurt */ | |
7643 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7644 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7645 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7646 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7647 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7648 | wake_up(&resync_wait); |
ac05f256 N |
7649 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
7650 | &mddev->recovery)) | |
7651 | if (mddev->sysfs_action) | |
7652 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7653 | } else | |
7654 | md_wakeup_thread(mddev->sync_thread); | |
7655 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7656 | md_new_event(mddev); | |
7657 | } | |
7658 | ||
1da177e4 LT |
7659 | /* |
7660 | * This routine is regularly called by all per-raid-array threads to | |
7661 | * deal with generic issues like resync and super-block update. | |
7662 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7663 | * need this as they never do any recovery or update the superblock. | |
7664 | * | |
7665 | * It does not do any resync itself, but rather "forks" off other threads | |
7666 | * to do that as needed. | |
7667 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7668 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7669 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7670 | * and wakeups up this thread which will reap the thread and finish up. |
7671 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7672 | * | |
7673 | * The overall approach is: | |
7674 | * 1/ if the superblock needs updating, update it. | |
7675 | * 2/ If a recovery thread is running, don't do anything else. | |
7676 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7677 | * 4/ If there are any faulty devices, remove them. | |
7678 | * 5/ If array is degraded, try to add spares devices | |
7679 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7680 | */ | |
fd01b88c | 7681 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 7682 | { |
68866e42 JB |
7683 | if (mddev->suspended) |
7684 | return; | |
7685 | ||
5f40402d | 7686 | if (mddev->bitmap) |
aa5cbd10 | 7687 | bitmap_daemon_work(mddev); |
1da177e4 | 7688 | |
fca4d848 | 7689 | if (signal_pending(current)) { |
31a59e34 | 7690 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7691 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7692 | mdname(mddev)); | |
7693 | mddev->safemode = 2; | |
7694 | } | |
7695 | flush_signals(current); | |
7696 | } | |
7697 | ||
c89a8eee N |
7698 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7699 | return; | |
1da177e4 | 7700 | if ( ! ( |
142d44c3 | 7701 | (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7702 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7703 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7704 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7705 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7706 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7707 | )) |
7708 | return; | |
fca4d848 | 7709 | |
df5b89b3 | 7710 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7711 | int spares = 0; |
fca4d848 | 7712 | |
c89a8eee | 7713 | if (mddev->ro) { |
7ceb17e8 N |
7714 | /* On a read-only array we can: |
7715 | * - remove failed devices | |
7716 | * - add already-in_sync devices if the array itself | |
7717 | * is in-sync. | |
7718 | * As we only add devices that are already in-sync, | |
7719 | * we can activate the spares immediately. | |
c89a8eee | 7720 | */ |
7ceb17e8 | 7721 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
7722 | /* There is no thread, but we need to call |
7723 | * ->spare_active and clear saved_raid_disk | |
7724 | */ | |
2ac295a5 | 7725 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 N |
7726 | md_reap_sync_thread(mddev); |
7727 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
c89a8eee N |
7728 | goto unlock; |
7729 | } | |
7730 | ||
31a59e34 | 7731 | if (!mddev->external) { |
0fd62b86 | 7732 | int did_change = 0; |
85572d7c | 7733 | spin_lock(&mddev->lock); |
31a59e34 N |
7734 | if (mddev->safemode && |
7735 | !atomic_read(&mddev->writes_pending) && | |
7736 | !mddev->in_sync && | |
7737 | mddev->recovery_cp == MaxSector) { | |
7738 | mddev->in_sync = 1; | |
0fd62b86 | 7739 | did_change = 1; |
070dc6dd | 7740 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7741 | } |
7742 | if (mddev->safemode == 1) | |
7743 | mddev->safemode = 0; | |
85572d7c | 7744 | spin_unlock(&mddev->lock); |
0fd62b86 | 7745 | if (did_change) |
00bcb4ac | 7746 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7747 | } |
fca4d848 | 7748 | |
7a0a5355 | 7749 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 7750 | md_update_sb(mddev, 0); |
06d91a5f | 7751 | |
1da177e4 LT |
7752 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7753 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7754 | /* resync/recovery still happening */ | |
7755 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7756 | goto unlock; | |
7757 | } | |
7758 | if (mddev->sync_thread) { | |
a91d5ac0 | 7759 | md_reap_sync_thread(mddev); |
1da177e4 LT |
7760 | goto unlock; |
7761 | } | |
72a23c21 NB |
7762 | /* Set RUNNING before clearing NEEDED to avoid |
7763 | * any transients in the value of "sync_action". | |
7764 | */ | |
72f36d59 | 7765 | mddev->curr_resync_completed = 0; |
72a23c21 | 7766 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
24dd469d N |
7767 | /* Clear some bits that don't mean anything, but |
7768 | * might be left set | |
7769 | */ | |
24dd469d N |
7770 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7771 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7772 | |
ed209584 N |
7773 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
7774 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 7775 | goto not_running; |
1da177e4 LT |
7776 | /* no recovery is running. |
7777 | * remove any failed drives, then | |
7778 | * add spares if possible. | |
72f36d59 | 7779 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
7780 | * the personality to fail the re-add. |
7781 | */ | |
1da177e4 | 7782 | |
b4c4c7b8 | 7783 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7784 | if (mddev->pers->check_reshape == NULL || |
7785 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 7786 | /* Cannot proceed */ |
ac05f256 | 7787 | goto not_running; |
b4c4c7b8 | 7788 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 7789 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 7790 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
7791 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7792 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7793 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7794 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7795 | } else if (mddev->recovery_cp < MaxSector) { |
7796 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7797 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7798 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7799 | /* nothing to be done ... */ | |
ac05f256 | 7800 | goto not_running; |
24dd469d | 7801 | |
1da177e4 | 7802 | if (mddev->pers->sync_request) { |
ef99bf48 | 7803 | if (spares) { |
a654b9d8 N |
7804 | /* We are adding a device or devices to an array |
7805 | * which has the bitmap stored on all devices. | |
7806 | * So make sure all bitmap pages get written | |
7807 | */ | |
7808 | bitmap_write_all(mddev->bitmap); | |
7809 | } | |
ac05f256 N |
7810 | INIT_WORK(&mddev->del_work, md_start_sync); |
7811 | queue_work(md_misc_wq, &mddev->del_work); | |
7812 | goto unlock; | |
1da177e4 | 7813 | } |
ac05f256 | 7814 | not_running: |
72a23c21 NB |
7815 | if (!mddev->sync_thread) { |
7816 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7817 | wake_up(&resync_wait); |
72a23c21 NB |
7818 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
7819 | &mddev->recovery)) | |
0c3573f1 | 7820 | if (mddev->sysfs_action) |
00bcb4ac | 7821 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7822 | } |
ac05f256 N |
7823 | unlock: |
7824 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
7825 | mddev_unlock(mddev); |
7826 | } | |
7827 | } | |
6c144d31 | 7828 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 7829 | |
a91d5ac0 JB |
7830 | void md_reap_sync_thread(struct mddev *mddev) |
7831 | { | |
7832 | struct md_rdev *rdev; | |
7833 | ||
7834 | /* resync has finished, collect result */ | |
7835 | md_unregister_thread(&mddev->sync_thread); | |
7836 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7837 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7838 | /* success...*/ | |
7839 | /* activate any spares */ | |
7840 | if (mddev->pers->spare_active(mddev)) { | |
7841 | sysfs_notify(&mddev->kobj, NULL, | |
7842 | "degraded"); | |
7843 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
7844 | } | |
7845 | } | |
7846 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7847 | mddev->pers->finish_reshape) | |
7848 | mddev->pers->finish_reshape(mddev); | |
7849 | ||
7850 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 7851 | * information must be scrapped. |
a91d5ac0 | 7852 | */ |
f466722c N |
7853 | if (!mddev->degraded) |
7854 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
7855 | rdev->saved_raid_disk = -1; |
7856 | ||
7857 | md_update_sb(mddev, 1); | |
7858 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7859 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7860 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7861 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7862 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 7863 | wake_up(&resync_wait); |
a91d5ac0 JB |
7864 | /* flag recovery needed just to double check */ |
7865 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7866 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7867 | md_new_event(mddev); | |
7868 | if (mddev->event_work.func) | |
7869 | queue_work(md_misc_wq, &mddev->event_work); | |
7870 | } | |
6c144d31 | 7871 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 7872 | |
fd01b88c | 7873 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 7874 | { |
00bcb4ac | 7875 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 7876 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
7877 | !test_bit(Blocked, &rdev->flags) && |
7878 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
7879 | msecs_to_jiffies(5000)); |
7880 | rdev_dec_pending(rdev, mddev); | |
7881 | } | |
7882 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7883 | ||
c6563a8c N |
7884 | void md_finish_reshape(struct mddev *mddev) |
7885 | { | |
7886 | /* called be personality module when reshape completes. */ | |
7887 | struct md_rdev *rdev; | |
7888 | ||
7889 | rdev_for_each(rdev, mddev) { | |
7890 | if (rdev->data_offset > rdev->new_data_offset) | |
7891 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
7892 | else | |
7893 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
7894 | rdev->data_offset = rdev->new_data_offset; | |
7895 | } | |
7896 | } | |
7897 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
7898 | |
7899 | /* Bad block management. | |
7900 | * We can record which blocks on each device are 'bad' and so just | |
7901 | * fail those blocks, or that stripe, rather than the whole device. | |
7902 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7903 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7904 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7905 | * A 'shift' can be set so that larger blocks are tracked and | |
7906 | * consequently larger devices can be covered. | |
7907 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7908 | * | |
7909 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7910 | * might need to retry if it is very unlucky. | |
7911 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7912 | * so we use the write_seqlock_irq variant. | |
7913 | * | |
7914 | * When looking for a bad block we specify a range and want to | |
7915 | * know if any block in the range is bad. So we binary-search | |
7916 | * to the last range that starts at-or-before the given endpoint, | |
7917 | * (or "before the sector after the target range") | |
7918 | * then see if it ends after the given start. | |
7919 | * We return | |
7920 | * 0 if there are no known bad blocks in the range | |
7921 | * 1 if there are known bad block which are all acknowledged | |
7922 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
7923 | * plus the start/length of the first bad section we overlap. | |
7924 | */ | |
7925 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
7926 | sector_t *first_bad, int *bad_sectors) | |
7927 | { | |
7928 | int hi; | |
ab05613a | 7929 | int lo; |
2230dfe4 | 7930 | u64 *p = bb->page; |
ab05613a | 7931 | int rv; |
2230dfe4 N |
7932 | sector_t target = s + sectors; |
7933 | unsigned seq; | |
7934 | ||
7935 | if (bb->shift > 0) { | |
7936 | /* round the start down, and the end up */ | |
7937 | s >>= bb->shift; | |
7938 | target += (1<<bb->shift) - 1; | |
7939 | target >>= bb->shift; | |
7940 | sectors = target - s; | |
7941 | } | |
7942 | /* 'target' is now the first block after the bad range */ | |
7943 | ||
7944 | retry: | |
7945 | seq = read_seqbegin(&bb->lock); | |
ab05613a | 7946 | lo = 0; |
7947 | rv = 0; | |
2230dfe4 N |
7948 | hi = bb->count; |
7949 | ||
7950 | /* Binary search between lo and hi for 'target' | |
7951 | * i.e. for the last range that starts before 'target' | |
7952 | */ | |
7953 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
7954 | * are known not to be the last range before target. | |
7955 | * VARIANT: hi-lo is the number of possible | |
7956 | * ranges, and decreases until it reaches 1 | |
7957 | */ | |
7958 | while (hi - lo > 1) { | |
7959 | int mid = (lo + hi) / 2; | |
7960 | sector_t a = BB_OFFSET(p[mid]); | |
7961 | if (a < target) | |
7962 | /* This could still be the one, earlier ranges | |
7963 | * could not. */ | |
7964 | lo = mid; | |
7965 | else | |
7966 | /* This and later ranges are definitely out. */ | |
7967 | hi = mid; | |
7968 | } | |
7969 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
7970 | if (hi > lo) { | |
7971 | /* need to check all range that end after 's' to see if | |
7972 | * any are unacknowledged. | |
7973 | */ | |
7974 | while (lo >= 0 && | |
7975 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7976 | if (BB_OFFSET(p[lo]) < target) { | |
7977 | /* starts before the end, and finishes after | |
7978 | * the start, so they must overlap | |
7979 | */ | |
7980 | if (rv != -1 && BB_ACK(p[lo])) | |
7981 | rv = 1; | |
7982 | else | |
7983 | rv = -1; | |
7984 | *first_bad = BB_OFFSET(p[lo]); | |
7985 | *bad_sectors = BB_LEN(p[lo]); | |
7986 | } | |
7987 | lo--; | |
7988 | } | |
7989 | } | |
7990 | ||
7991 | if (read_seqretry(&bb->lock, seq)) | |
7992 | goto retry; | |
7993 | ||
7994 | return rv; | |
7995 | } | |
7996 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
7997 | ||
7998 | /* | |
7999 | * Add a range of bad blocks to the table. | |
8000 | * This might extend the table, or might contract it | |
8001 | * if two adjacent ranges can be merged. | |
8002 | * We binary-search to find the 'insertion' point, then | |
8003 | * decide how best to handle it. | |
8004 | */ | |
8005 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
8006 | int acknowledged) | |
8007 | { | |
8008 | u64 *p; | |
8009 | int lo, hi; | |
8010 | int rv = 1; | |
905b0297 | 8011 | unsigned long flags; |
2230dfe4 N |
8012 | |
8013 | if (bb->shift < 0) | |
8014 | /* badblocks are disabled */ | |
8015 | return 0; | |
8016 | ||
8017 | if (bb->shift) { | |
8018 | /* round the start down, and the end up */ | |
8019 | sector_t next = s + sectors; | |
8020 | s >>= bb->shift; | |
8021 | next += (1<<bb->shift) - 1; | |
8022 | next >>= bb->shift; | |
8023 | sectors = next - s; | |
8024 | } | |
8025 | ||
905b0297 | 8026 | write_seqlock_irqsave(&bb->lock, flags); |
2230dfe4 N |
8027 | |
8028 | p = bb->page; | |
8029 | lo = 0; | |
8030 | hi = bb->count; | |
8031 | /* Find the last range that starts at-or-before 's' */ | |
8032 | while (hi - lo > 1) { | |
8033 | int mid = (lo + hi) / 2; | |
8034 | sector_t a = BB_OFFSET(p[mid]); | |
8035 | if (a <= s) | |
8036 | lo = mid; | |
8037 | else | |
8038 | hi = mid; | |
8039 | } | |
8040 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8041 | hi = lo; | |
8042 | ||
8043 | if (hi > lo) { | |
8044 | /* we found a range that might merge with the start | |
8045 | * of our new range | |
8046 | */ | |
8047 | sector_t a = BB_OFFSET(p[lo]); | |
8048 | sector_t e = a + BB_LEN(p[lo]); | |
8049 | int ack = BB_ACK(p[lo]); | |
8050 | if (e >= s) { | |
8051 | /* Yes, we can merge with a previous range */ | |
8052 | if (s == a && s + sectors >= e) | |
8053 | /* new range covers old */ | |
8054 | ack = acknowledged; | |
8055 | else | |
8056 | ack = ack && acknowledged; | |
8057 | ||
8058 | if (e < s + sectors) | |
8059 | e = s + sectors; | |
8060 | if (e - a <= BB_MAX_LEN) { | |
8061 | p[lo] = BB_MAKE(a, e-a, ack); | |
8062 | s = e; | |
8063 | } else { | |
8064 | /* does not all fit in one range, | |
8065 | * make p[lo] maximal | |
8066 | */ | |
8067 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8068 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8069 | s = a + BB_MAX_LEN; | |
8070 | } | |
8071 | sectors = e - s; | |
8072 | } | |
8073 | } | |
8074 | if (sectors && hi < bb->count) { | |
8075 | /* 'hi' points to the first range that starts after 's'. | |
8076 | * Maybe we can merge with the start of that range */ | |
8077 | sector_t a = BB_OFFSET(p[hi]); | |
8078 | sector_t e = a + BB_LEN(p[hi]); | |
8079 | int ack = BB_ACK(p[hi]); | |
8080 | if (a <= s + sectors) { | |
8081 | /* merging is possible */ | |
8082 | if (e <= s + sectors) { | |
8083 | /* full overlap */ | |
8084 | e = s + sectors; | |
8085 | ack = acknowledged; | |
8086 | } else | |
8087 | ack = ack && acknowledged; | |
8088 | ||
8089 | a = s; | |
8090 | if (e - a <= BB_MAX_LEN) { | |
8091 | p[hi] = BB_MAKE(a, e-a, ack); | |
8092 | s = e; | |
8093 | } else { | |
8094 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8095 | s = a + BB_MAX_LEN; | |
8096 | } | |
8097 | sectors = e - s; | |
8098 | lo = hi; | |
8099 | hi++; | |
8100 | } | |
8101 | } | |
8102 | if (sectors == 0 && hi < bb->count) { | |
8103 | /* we might be able to combine lo and hi */ | |
8104 | /* Note: 's' is at the end of 'lo' */ | |
8105 | sector_t a = BB_OFFSET(p[hi]); | |
8106 | int lolen = BB_LEN(p[lo]); | |
8107 | int hilen = BB_LEN(p[hi]); | |
8108 | int newlen = lolen + hilen - (s - a); | |
8109 | if (s >= a && newlen < BB_MAX_LEN) { | |
8110 | /* yes, we can combine them */ | |
8111 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8112 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8113 | memmove(p + hi, p + hi + 1, | |
8114 | (bb->count - hi - 1) * 8); | |
8115 | bb->count--; | |
8116 | } | |
8117 | } | |
8118 | while (sectors) { | |
8119 | /* didn't merge (it all). | |
8120 | * Need to add a range just before 'hi' */ | |
8121 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8122 | /* No room for more */ | |
8123 | rv = 0; | |
8124 | break; | |
8125 | } else { | |
8126 | int this_sectors = sectors; | |
8127 | memmove(p + hi + 1, p + hi, | |
8128 | (bb->count - hi) * 8); | |
8129 | bb->count++; | |
8130 | ||
8131 | if (this_sectors > BB_MAX_LEN) | |
8132 | this_sectors = BB_MAX_LEN; | |
8133 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8134 | sectors -= this_sectors; | |
8135 | s += this_sectors; | |
8136 | } | |
8137 | } | |
8138 | ||
8139 | bb->changed = 1; | |
de393cde N |
8140 | if (!acknowledged) |
8141 | bb->unacked_exist = 1; | |
905b0297 | 8142 | write_sequnlock_irqrestore(&bb->lock, flags); |
2230dfe4 N |
8143 | |
8144 | return rv; | |
8145 | } | |
8146 | ||
3cb03002 | 8147 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8148 | int is_new) |
2230dfe4 | 8149 | { |
c6563a8c N |
8150 | int rv; |
8151 | if (is_new) | |
8152 | s += rdev->new_data_offset; | |
8153 | else | |
8154 | s += rdev->data_offset; | |
8155 | rv = md_set_badblocks(&rdev->badblocks, | |
8156 | s, sectors, 0); | |
2230dfe4 N |
8157 | if (rv) { |
8158 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8159 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 N |
8160 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
8161 | md_wakeup_thread(rdev->mddev->thread); | |
8162 | } | |
8163 | return rv; | |
8164 | } | |
8165 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8166 | ||
8167 | /* | |
8168 | * Remove a range of bad blocks from the table. | |
8169 | * This may involve extending the table if we spilt a region, | |
8170 | * but it must not fail. So if the table becomes full, we just | |
8171 | * drop the remove request. | |
8172 | */ | |
8173 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8174 | { | |
8175 | u64 *p; | |
8176 | int lo, hi; | |
8177 | sector_t target = s + sectors; | |
8178 | int rv = 0; | |
8179 | ||
8180 | if (bb->shift > 0) { | |
8181 | /* When clearing we round the start up and the end down. | |
8182 | * This should not matter as the shift should align with | |
8183 | * the block size and no rounding should ever be needed. | |
8184 | * However it is better the think a block is bad when it | |
8185 | * isn't than to think a block is not bad when it is. | |
8186 | */ | |
8187 | s += (1<<bb->shift) - 1; | |
8188 | s >>= bb->shift; | |
8189 | target >>= bb->shift; | |
8190 | sectors = target - s; | |
8191 | } | |
8192 | ||
8193 | write_seqlock_irq(&bb->lock); | |
8194 | ||
8195 | p = bb->page; | |
8196 | lo = 0; | |
8197 | hi = bb->count; | |
8198 | /* Find the last range that starts before 'target' */ | |
8199 | while (hi - lo > 1) { | |
8200 | int mid = (lo + hi) / 2; | |
8201 | sector_t a = BB_OFFSET(p[mid]); | |
8202 | if (a < target) | |
8203 | lo = mid; | |
8204 | else | |
8205 | hi = mid; | |
8206 | } | |
8207 | if (hi > lo) { | |
8208 | /* p[lo] is the last range that could overlap the | |
8209 | * current range. Earlier ranges could also overlap, | |
8210 | * but only this one can overlap the end of the range. | |
8211 | */ | |
8212 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8213 | /* Partial overlap, leave the tail of this range */ | |
8214 | int ack = BB_ACK(p[lo]); | |
8215 | sector_t a = BB_OFFSET(p[lo]); | |
8216 | sector_t end = a + BB_LEN(p[lo]); | |
8217 | ||
8218 | if (a < s) { | |
8219 | /* we need to split this range */ | |
8220 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8b32bf5e | 8221 | rv = -ENOSPC; |
2230dfe4 N |
8222 | goto out; |
8223 | } | |
8224 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8225 | bb->count++; | |
8226 | p[lo] = BB_MAKE(a, s-a, ack); | |
8227 | lo++; | |
8228 | } | |
8229 | p[lo] = BB_MAKE(target, end - target, ack); | |
8230 | /* there is no longer an overlap */ | |
8231 | hi = lo; | |
8232 | lo--; | |
8233 | } | |
8234 | while (lo >= 0 && | |
8235 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8236 | /* This range does overlap */ | |
8237 | if (BB_OFFSET(p[lo]) < s) { | |
8238 | /* Keep the early parts of this range. */ | |
8239 | int ack = BB_ACK(p[lo]); | |
8240 | sector_t start = BB_OFFSET(p[lo]); | |
8241 | p[lo] = BB_MAKE(start, s - start, ack); | |
8242 | /* now low doesn't overlap, so.. */ | |
8243 | break; | |
8244 | } | |
8245 | lo--; | |
8246 | } | |
8247 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8248 | * anything between needs to be discarded | |
8249 | */ | |
8250 | if (hi - lo > 1) { | |
8251 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8252 | bb->count -= (hi - lo - 1); | |
8253 | } | |
8254 | } | |
8255 | ||
8256 | bb->changed = 1; | |
8257 | out: | |
8258 | write_sequnlock_irq(&bb->lock); | |
8259 | return rv; | |
8260 | } | |
8261 | ||
c6563a8c N |
8262 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8263 | int is_new) | |
2230dfe4 | 8264 | { |
c6563a8c N |
8265 | if (is_new) |
8266 | s += rdev->new_data_offset; | |
8267 | else | |
8268 | s += rdev->data_offset; | |
2230dfe4 | 8269 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8270 | s, sectors); |
2230dfe4 N |
8271 | } |
8272 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8273 | ||
8274 | /* | |
8275 | * Acknowledge all bad blocks in a list. | |
8276 | * This only succeeds if ->changed is clear. It is used by | |
8277 | * in-kernel metadata updates | |
8278 | */ | |
8279 | void md_ack_all_badblocks(struct badblocks *bb) | |
8280 | { | |
8281 | if (bb->page == NULL || bb->changed) | |
8282 | /* no point even trying */ | |
8283 | return; | |
8284 | write_seqlock_irq(&bb->lock); | |
8285 | ||
ecb178bb | 8286 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8287 | u64 *p = bb->page; |
8288 | int i; | |
8289 | for (i = 0; i < bb->count ; i++) { | |
8290 | if (!BB_ACK(p[i])) { | |
8291 | sector_t start = BB_OFFSET(p[i]); | |
8292 | int len = BB_LEN(p[i]); | |
8293 | p[i] = BB_MAKE(start, len, 1); | |
8294 | } | |
8295 | } | |
de393cde | 8296 | bb->unacked_exist = 0; |
2230dfe4 N |
8297 | } |
8298 | write_sequnlock_irq(&bb->lock); | |
8299 | } | |
8300 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8301 | ||
16c791a5 N |
8302 | /* sysfs access to bad-blocks list. |
8303 | * We present two files. | |
8304 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8305 | * are recorded as bad. The list is truncated to fit within | |
8306 | * the one-page limit of sysfs. | |
8307 | * Writing "sector length" to this file adds an acknowledged | |
8308 | * bad block list. | |
8309 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8310 | * been acknowledged. Writing to this file adds bad blocks | |
8311 | * without acknowledging them. This is largely for testing. | |
8312 | */ | |
8313 | ||
8314 | static ssize_t | |
8315 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8316 | { | |
8317 | size_t len; | |
8318 | int i; | |
8319 | u64 *p = bb->page; | |
8320 | unsigned seq; | |
8321 | ||
8322 | if (bb->shift < 0) | |
8323 | return 0; | |
8324 | ||
8325 | retry: | |
8326 | seq = read_seqbegin(&bb->lock); | |
8327 | ||
8328 | len = 0; | |
8329 | i = 0; | |
8330 | ||
8331 | while (len < PAGE_SIZE && i < bb->count) { | |
8332 | sector_t s = BB_OFFSET(p[i]); | |
8333 | unsigned int length = BB_LEN(p[i]); | |
8334 | int ack = BB_ACK(p[i]); | |
8335 | i++; | |
8336 | ||
8337 | if (unack && ack) | |
8338 | continue; | |
8339 | ||
8340 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8341 | (unsigned long long)s << bb->shift, | |
8342 | length << bb->shift); | |
8343 | } | |
de393cde N |
8344 | if (unack && len == 0) |
8345 | bb->unacked_exist = 0; | |
16c791a5 N |
8346 | |
8347 | if (read_seqretry(&bb->lock, seq)) | |
8348 | goto retry; | |
8349 | ||
8350 | return len; | |
8351 | } | |
8352 | ||
8353 | #define DO_DEBUG 1 | |
8354 | ||
8355 | static ssize_t | |
8356 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8357 | { | |
8358 | unsigned long long sector; | |
8359 | int length; | |
8360 | char newline; | |
8361 | #ifdef DO_DEBUG | |
8362 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8363 | * Normally only a successful write may clear a badblock | |
8364 | */ | |
8365 | int clear = 0; | |
8366 | if (page[0] == '-') { | |
8367 | clear = 1; | |
8368 | page++; | |
8369 | } | |
8370 | #endif /* DO_DEBUG */ | |
8371 | ||
8372 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8373 | case 3: | |
8374 | if (newline != '\n') | |
8375 | return -EINVAL; | |
8376 | case 2: | |
8377 | if (length <= 0) | |
8378 | return -EINVAL; | |
8379 | break; | |
8380 | default: | |
8381 | return -EINVAL; | |
8382 | } | |
8383 | ||
8384 | #ifdef DO_DEBUG | |
8385 | if (clear) { | |
8386 | md_clear_badblocks(bb, sector, length); | |
8387 | return len; | |
8388 | } | |
8389 | #endif /* DO_DEBUG */ | |
8390 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8391 | return len; | |
8392 | else | |
8393 | return -ENOSPC; | |
8394 | } | |
8395 | ||
75c96f85 AB |
8396 | static int md_notify_reboot(struct notifier_block *this, |
8397 | unsigned long code, void *x) | |
1da177e4 LT |
8398 | { |
8399 | struct list_head *tmp; | |
fd01b88c | 8400 | struct mddev *mddev; |
2dba6a91 | 8401 | int need_delay = 0; |
1da177e4 | 8402 | |
c744a65c N |
8403 | for_each_mddev(mddev, tmp) { |
8404 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8405 | if (mddev->pers) |
8406 | __md_stop_writes(mddev); | |
0f62fb22 N |
8407 | if (mddev->persistent) |
8408 | mddev->safemode = 2; | |
c744a65c | 8409 | mddev_unlock(mddev); |
2dba6a91 | 8410 | } |
c744a65c | 8411 | need_delay = 1; |
1da177e4 | 8412 | } |
c744a65c N |
8413 | /* |
8414 | * certain more exotic SCSI devices are known to be | |
8415 | * volatile wrt too early system reboots. While the | |
8416 | * right place to handle this issue is the given | |
8417 | * driver, we do want to have a safe RAID driver ... | |
8418 | */ | |
8419 | if (need_delay) | |
8420 | mdelay(1000*1); | |
8421 | ||
1da177e4 LT |
8422 | return NOTIFY_DONE; |
8423 | } | |
8424 | ||
75c96f85 | 8425 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8426 | .notifier_call = md_notify_reboot, |
8427 | .next = NULL, | |
8428 | .priority = INT_MAX, /* before any real devices */ | |
8429 | }; | |
8430 | ||
8431 | static void md_geninit(void) | |
8432 | { | |
36a4e1fe | 8433 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8434 | |
c7705f34 | 8435 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8436 | } |
8437 | ||
75c96f85 | 8438 | static int __init md_init(void) |
1da177e4 | 8439 | { |
e804ac78 TH |
8440 | int ret = -ENOMEM; |
8441 | ||
ada609ee | 8442 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8443 | if (!md_wq) |
8444 | goto err_wq; | |
8445 | ||
8446 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8447 | if (!md_misc_wq) | |
8448 | goto err_misc_wq; | |
8449 | ||
8450 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8451 | goto err_md; | |
8452 | ||
8453 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8454 | goto err_mdp; | |
8455 | mdp_major = ret; | |
8456 | ||
af5628f0 | 8457 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
8458 | md_probe, NULL, NULL); |
8459 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8460 | md_probe, NULL, NULL); |
8461 | ||
1da177e4 | 8462 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8463 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8464 | |
8465 | md_geninit(); | |
d710e138 | 8466 | return 0; |
1da177e4 | 8467 | |
e804ac78 TH |
8468 | err_mdp: |
8469 | unregister_blkdev(MD_MAJOR, "md"); | |
8470 | err_md: | |
8471 | destroy_workqueue(md_misc_wq); | |
8472 | err_misc_wq: | |
8473 | destroy_workqueue(md_wq); | |
8474 | err_wq: | |
8475 | return ret; | |
8476 | } | |
1da177e4 LT |
8477 | |
8478 | #ifndef MODULE | |
8479 | ||
8480 | /* | |
8481 | * Searches all registered partitions for autorun RAID arrays | |
8482 | * at boot time. | |
8483 | */ | |
4d936ec1 ME |
8484 | |
8485 | static LIST_HEAD(all_detected_devices); | |
8486 | struct detected_devices_node { | |
8487 | struct list_head list; | |
8488 | dev_t dev; | |
8489 | }; | |
1da177e4 LT |
8490 | |
8491 | void md_autodetect_dev(dev_t dev) | |
8492 | { | |
4d936ec1 ME |
8493 | struct detected_devices_node *node_detected_dev; |
8494 | ||
8495 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8496 | if (node_detected_dev) { | |
8497 | node_detected_dev->dev = dev; | |
8498 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8499 | } else { | |
8500 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8501 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8502 | } | |
1da177e4 LT |
8503 | } |
8504 | ||
1da177e4 LT |
8505 | static void autostart_arrays(int part) |
8506 | { | |
3cb03002 | 8507 | struct md_rdev *rdev; |
4d936ec1 ME |
8508 | struct detected_devices_node *node_detected_dev; |
8509 | dev_t dev; | |
8510 | int i_scanned, i_passed; | |
1da177e4 | 8511 | |
4d936ec1 ME |
8512 | i_scanned = 0; |
8513 | i_passed = 0; | |
1da177e4 | 8514 | |
4d936ec1 | 8515 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8516 | |
4d936ec1 ME |
8517 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8518 | i_scanned++; | |
8519 | node_detected_dev = list_entry(all_detected_devices.next, | |
8520 | struct detected_devices_node, list); | |
8521 | list_del(&node_detected_dev->list); | |
8522 | dev = node_detected_dev->dev; | |
8523 | kfree(node_detected_dev); | |
df968c4e | 8524 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8525 | if (IS_ERR(rdev)) |
8526 | continue; | |
8527 | ||
403df478 | 8528 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 8529 | continue; |
403df478 | 8530 | |
d0fae18f | 8531 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8532 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8533 | i_passed++; |
1da177e4 | 8534 | } |
4d936ec1 ME |
8535 | |
8536 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8537 | i_scanned, i_passed); | |
1da177e4 LT |
8538 | |
8539 | autorun_devices(part); | |
8540 | } | |
8541 | ||
fdee8ae4 | 8542 | #endif /* !MODULE */ |
1da177e4 LT |
8543 | |
8544 | static __exit void md_exit(void) | |
8545 | { | |
fd01b88c | 8546 | struct mddev *mddev; |
1da177e4 | 8547 | struct list_head *tmp; |
e2f23b60 | 8548 | int delay = 1; |
8ab5e4c1 | 8549 | |
af5628f0 | 8550 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 8551 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8552 | |
3dbd8c2e | 8553 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8554 | unregister_blkdev(mdp_major, "mdp"); |
8555 | unregister_reboot_notifier(&md_notifier); | |
8556 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
8557 | |
8558 | /* We cannot unload the modules while some process is | |
8559 | * waiting for us in select() or poll() - wake them up | |
8560 | */ | |
8561 | md_unloading = 1; | |
8562 | while (waitqueue_active(&md_event_waiters)) { | |
8563 | /* not safe to leave yet */ | |
8564 | wake_up(&md_event_waiters); | |
8565 | msleep(delay); | |
8566 | delay += delay; | |
8567 | } | |
1da177e4 | 8568 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 8569 | |
29ac4aa3 | 8570 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8571 | export_array(mddev); |
d3374825 | 8572 | mddev->hold_active = 0; |
1da177e4 | 8573 | } |
e804ac78 TH |
8574 | destroy_workqueue(md_misc_wq); |
8575 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8576 | } |
8577 | ||
685784aa | 8578 | subsys_initcall(md_init); |
1da177e4 LT |
8579 | module_exit(md_exit) |
8580 | ||
f91de92e N |
8581 | static int get_ro(char *buffer, struct kernel_param *kp) |
8582 | { | |
8583 | return sprintf(buffer, "%d", start_readonly); | |
8584 | } | |
8585 | static int set_ro(const char *val, struct kernel_param *kp) | |
8586 | { | |
8587 | char *e; | |
8588 | int num = simple_strtoul(val, &e, 10); | |
8589 | if (*val && (*e == '\0' || *e == '\n')) { | |
8590 | start_readonly = num; | |
4dbcdc75 | 8591 | return 0; |
f91de92e N |
8592 | } |
8593 | return -EINVAL; | |
8594 | } | |
8595 | ||
80ca3a44 N |
8596 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8597 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 8598 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8599 | |
1da177e4 | 8600 | MODULE_LICENSE("GPL"); |
0efb9e61 | 8601 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8602 | MODULE_ALIAS("md"); |
72008652 | 8603 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |