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); | |
5aa61f42 | 75 | static void mddev_detach(struct mddev *mddev); |
746d3207 | 76 | |
1e50915f RB |
77 | /* |
78 | * Default number of read corrections we'll attempt on an rdev | |
79 | * before ejecting it from the array. We divide the read error | |
80 | * count by 2 for every hour elapsed between read errors. | |
81 | */ | |
82 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
83 | /* |
84 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
85 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
86 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 87 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
88 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
89 | * speed limit - in case reconstruction slows down your system despite | |
90 | * idle IO detection. | |
91 | * | |
92 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 93 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
94 | */ |
95 | ||
96 | static int sysctl_speed_limit_min = 1000; | |
97 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 98 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
99 | { |
100 | return mddev->sync_speed_min ? | |
101 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
102 | } | |
103 | ||
fd01b88c | 104 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
105 | { |
106 | return mddev->sync_speed_max ? | |
107 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
108 | } | |
1da177e4 LT |
109 | |
110 | static struct ctl_table_header *raid_table_header; | |
111 | ||
82592c38 | 112 | static struct ctl_table raid_table[] = { |
1da177e4 | 113 | { |
1da177e4 LT |
114 | .procname = "speed_limit_min", |
115 | .data = &sysctl_speed_limit_min, | |
116 | .maxlen = sizeof(int), | |
80ca3a44 | 117 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 118 | .proc_handler = proc_dointvec, |
1da177e4 LT |
119 | }, |
120 | { | |
1da177e4 LT |
121 | .procname = "speed_limit_max", |
122 | .data = &sysctl_speed_limit_max, | |
123 | .maxlen = sizeof(int), | |
80ca3a44 | 124 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 125 | .proc_handler = proc_dointvec, |
1da177e4 | 126 | }, |
894d2491 | 127 | { } |
1da177e4 LT |
128 | }; |
129 | ||
82592c38 | 130 | static struct ctl_table raid_dir_table[] = { |
1da177e4 | 131 | { |
1da177e4 LT |
132 | .procname = "raid", |
133 | .maxlen = 0, | |
80ca3a44 | 134 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
135 | .child = raid_table, |
136 | }, | |
894d2491 | 137 | { } |
1da177e4 LT |
138 | }; |
139 | ||
82592c38 | 140 | static struct ctl_table raid_root_table[] = { |
1da177e4 | 141 | { |
1da177e4 LT |
142 | .procname = "dev", |
143 | .maxlen = 0, | |
144 | .mode = 0555, | |
145 | .child = raid_dir_table, | |
146 | }, | |
894d2491 | 147 | { } |
1da177e4 LT |
148 | }; |
149 | ||
83d5cde4 | 150 | static const struct block_device_operations md_fops; |
1da177e4 | 151 | |
f91de92e N |
152 | static int start_readonly; |
153 | ||
a167f663 N |
154 | /* bio_clone_mddev |
155 | * like bio_clone, but with a local bio set | |
156 | */ | |
157 | ||
a167f663 | 158 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 159 | struct mddev *mddev) |
a167f663 N |
160 | { |
161 | struct bio *b; | |
a167f663 N |
162 | |
163 | if (!mddev || !mddev->bio_set) | |
164 | return bio_alloc(gfp_mask, nr_iovecs); | |
165 | ||
395c72a7 | 166 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
167 | if (!b) |
168 | return NULL; | |
a167f663 N |
169 | return b; |
170 | } | |
171 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
172 | ||
173 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 174 | struct mddev *mddev) |
a167f663 | 175 | { |
a167f663 N |
176 | if (!mddev || !mddev->bio_set) |
177 | return bio_clone(bio, gfp_mask); | |
178 | ||
bf800ef1 | 179 | return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
a167f663 N |
180 | } |
181 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
182 | ||
d7603b7e N |
183 | /* |
184 | * We have a system wide 'event count' that is incremented | |
185 | * on any 'interesting' event, and readers of /proc/mdstat | |
186 | * can use 'poll' or 'select' to find out when the event | |
187 | * count increases. | |
188 | * | |
189 | * Events are: | |
190 | * start array, stop array, error, add device, remove device, | |
191 | * start build, activate spare | |
192 | */ | |
2989ddbd | 193 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 194 | static atomic_t md_event_count; |
fd01b88c | 195 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
196 | { |
197 | atomic_inc(&md_event_count); | |
198 | wake_up(&md_event_waiters); | |
199 | } | |
29269553 | 200 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 201 | |
c331eb04 N |
202 | /* Alternate version that can be called from interrupts |
203 | * when calling sysfs_notify isn't needed. | |
204 | */ | |
fd01b88c | 205 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
206 | { |
207 | atomic_inc(&md_event_count); | |
208 | wake_up(&md_event_waiters); | |
209 | } | |
210 | ||
1da177e4 LT |
211 | /* |
212 | * Enables to iterate over all existing md arrays | |
213 | * all_mddevs_lock protects this list. | |
214 | */ | |
215 | static LIST_HEAD(all_mddevs); | |
216 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
217 | ||
1da177e4 LT |
218 | /* |
219 | * iterates through all used mddevs in the system. | |
220 | * We take care to grab the all_mddevs_lock whenever navigating | |
221 | * the list, and to always hold a refcount when unlocked. | |
222 | * Any code which breaks out of this loop while own | |
223 | * a reference to the current mddev and must mddev_put it. | |
224 | */ | |
fd01b88c | 225 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 | 226 | \ |
f72ffdd6 | 227 | for (({ spin_lock(&all_mddevs_lock); \ |
fd01b88c N |
228 | _tmp = all_mddevs.next; \ |
229 | _mddev = NULL;}); \ | |
230 | ({ if (_tmp != &all_mddevs) \ | |
231 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 232 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
233 | if (_mddev) mddev_put(_mddev); \ |
234 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
235 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 236 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 237 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
238 | ) |
239 | ||
409c57f3 N |
240 | /* Rather than calling directly into the personality make_request function, |
241 | * IO requests come here first so that we can check if the device is | |
242 | * being suspended pending a reconfiguration. | |
243 | * We hold a refcount over the call to ->make_request. By the time that | |
244 | * call has finished, the bio has been linked into some internal structure | |
245 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
246 | */ | |
5a7bbad2 | 247 | static void md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 248 | { |
49077326 | 249 | const int rw = bio_data_dir(bio); |
fd01b88c | 250 | struct mddev *mddev = q->queuedata; |
e91ece55 | 251 | unsigned int sectors; |
74672d06 | 252 | int cpu; |
49077326 | 253 | |
0ca69886 N |
254 | if (mddev == NULL || mddev->pers == NULL |
255 | || !mddev->ready) { | |
409c57f3 | 256 | bio_io_error(bio); |
5a7bbad2 | 257 | return; |
409c57f3 | 258 | } |
bbfa57c0 SR |
259 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
260 | bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS); | |
261 | return; | |
262 | } | |
0ca69886 | 263 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 264 | rcu_read_lock(); |
e9c7469b | 265 | if (mddev->suspended) { |
409c57f3 N |
266 | DEFINE_WAIT(__wait); |
267 | for (;;) { | |
268 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
269 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 270 | if (!mddev->suspended) |
409c57f3 N |
271 | break; |
272 | rcu_read_unlock(); | |
273 | schedule(); | |
274 | rcu_read_lock(); | |
275 | } | |
276 | finish_wait(&mddev->sb_wait, &__wait); | |
277 | } | |
278 | atomic_inc(&mddev->active_io); | |
279 | rcu_read_unlock(); | |
49077326 | 280 | |
e91ece55 CM |
281 | /* |
282 | * save the sectors now since our bio can | |
283 | * go away inside make_request | |
284 | */ | |
285 | sectors = bio_sectors(bio); | |
5a7bbad2 | 286 | mddev->pers->make_request(mddev, bio); |
49077326 | 287 | |
74672d06 GZ |
288 | cpu = part_stat_lock(); |
289 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
290 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); | |
291 | part_stat_unlock(); | |
49077326 | 292 | |
409c57f3 N |
293 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
294 | wake_up(&mddev->sb_wait); | |
409c57f3 N |
295 | } |
296 | ||
9e35b99c N |
297 | /* mddev_suspend makes sure no new requests are submitted |
298 | * to the device, and that any requests that have been submitted | |
299 | * are completely handled. | |
afa0f557 N |
300 | * Once mddev_detach() is called and completes, the module will be |
301 | * completely unused. | |
9e35b99c | 302 | */ |
fd01b88c | 303 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
304 | { |
305 | BUG_ON(mddev->suspended); | |
306 | mddev->suspended = 1; | |
307 | synchronize_rcu(); | |
308 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
309 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
310 | |
311 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 312 | } |
390ee602 | 313 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 314 | |
fd01b88c | 315 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
316 | { |
317 | mddev->suspended = 0; | |
318 | wake_up(&mddev->sb_wait); | |
319 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 320 | |
47525e59 | 321 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
322 | md_wakeup_thread(mddev->thread); |
323 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 324 | } |
390ee602 | 325 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 326 | |
fd01b88c | 327 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 | 328 | { |
5c675f83 N |
329 | struct md_personality *pers = mddev->pers; |
330 | int ret = 0; | |
331 | ||
332 | rcu_read_lock(); | |
333 | if (mddev->suspended) | |
334 | ret = 1; | |
335 | else if (pers && pers->congested) | |
336 | ret = pers->congested(mddev, bits); | |
337 | rcu_read_unlock(); | |
338 | return ret; | |
339 | } | |
340 | EXPORT_SYMBOL_GPL(mddev_congested); | |
341 | static int md_congested(void *data, int bits) | |
342 | { | |
343 | struct mddev *mddev = data; | |
344 | return mddev_congested(mddev, bits); | |
3fa841d7 | 345 | } |
3fa841d7 | 346 | |
64590f45 N |
347 | static int md_mergeable_bvec(struct request_queue *q, |
348 | struct bvec_merge_data *bvm, | |
349 | struct bio_vec *biovec) | |
350 | { | |
351 | struct mddev *mddev = q->queuedata; | |
352 | int ret; | |
353 | rcu_read_lock(); | |
354 | if (mddev->suspended) { | |
355 | /* Must always allow one vec */ | |
356 | if (bvm->bi_size == 0) | |
357 | ret = biovec->bv_len; | |
358 | else | |
359 | ret = 0; | |
360 | } else { | |
361 | struct md_personality *pers = mddev->pers; | |
362 | if (pers && pers->mergeable_bvec) | |
363 | ret = pers->mergeable_bvec(mddev, bvm, biovec); | |
364 | else | |
365 | ret = biovec->bv_len; | |
366 | } | |
367 | rcu_read_unlock(); | |
368 | return ret; | |
369 | } | |
a2826aa9 | 370 | /* |
e9c7469b | 371 | * Generic flush handling for md |
a2826aa9 N |
372 | */ |
373 | ||
e9c7469b | 374 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 | 375 | { |
3cb03002 | 376 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 377 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
378 | |
379 | rdev_dec_pending(rdev, mddev); | |
380 | ||
381 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 382 | /* The pre-request flush has finished */ |
e804ac78 | 383 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
384 | } |
385 | bio_put(bio); | |
386 | } | |
387 | ||
a7a07e69 N |
388 | static void md_submit_flush_data(struct work_struct *ws); |
389 | ||
a035fc3e | 390 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 391 | { |
fd01b88c | 392 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 393 | struct md_rdev *rdev; |
a2826aa9 | 394 | |
a7a07e69 N |
395 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
396 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 397 | rcu_read_lock(); |
dafb20fa | 398 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
399 | if (rdev->raid_disk >= 0 && |
400 | !test_bit(Faulty, &rdev->flags)) { | |
401 | /* Take two references, one is dropped | |
402 | * when request finishes, one after | |
403 | * we reclaim rcu_read_lock | |
404 | */ | |
405 | struct bio *bi; | |
406 | atomic_inc(&rdev->nr_pending); | |
407 | atomic_inc(&rdev->nr_pending); | |
408 | rcu_read_unlock(); | |
b5e1b8ce | 409 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 410 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
411 | bi->bi_private = rdev; |
412 | bi->bi_bdev = rdev->bdev; | |
413 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 414 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
415 | rcu_read_lock(); |
416 | rdev_dec_pending(rdev, mddev); | |
417 | } | |
418 | rcu_read_unlock(); | |
a7a07e69 N |
419 | if (atomic_dec_and_test(&mddev->flush_pending)) |
420 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
421 | } |
422 | ||
e9c7469b | 423 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 424 | { |
fd01b88c | 425 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 426 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 427 | |
4f024f37 | 428 | if (bio->bi_iter.bi_size == 0) |
a2826aa9 N |
429 | /* an empty barrier - all done */ |
430 | bio_endio(bio, 0); | |
431 | else { | |
e9c7469b | 432 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 433 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 434 | } |
2b74e12e N |
435 | |
436 | mddev->flush_bio = NULL; | |
437 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
438 | } |
439 | ||
fd01b88c | 440 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 | 441 | { |
85572d7c | 442 | spin_lock_irq(&mddev->lock); |
a2826aa9 | 443 | wait_event_lock_irq(mddev->sb_wait, |
e9c7469b | 444 | !mddev->flush_bio, |
85572d7c | 445 | mddev->lock); |
e9c7469b | 446 | mddev->flush_bio = bio; |
85572d7c | 447 | spin_unlock_irq(&mddev->lock); |
a2826aa9 | 448 | |
a035fc3e N |
449 | INIT_WORK(&mddev->flush_work, submit_flushes); |
450 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 451 | } |
e9c7469b | 452 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 453 | |
74018dc3 | 454 | void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
97658cdd | 455 | { |
9cbb1750 N |
456 | struct mddev *mddev = cb->data; |
457 | md_wakeup_thread(mddev->thread); | |
458 | kfree(cb); | |
97658cdd | 459 | } |
9cbb1750 | 460 | EXPORT_SYMBOL(md_unplug); |
2ac87401 | 461 | |
fd01b88c | 462 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
463 | { |
464 | atomic_inc(&mddev->active); | |
465 | return mddev; | |
466 | } | |
467 | ||
5fd3a17e | 468 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 469 | |
fd01b88c | 470 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 471 | { |
a167f663 N |
472 | struct bio_set *bs = NULL; |
473 | ||
1da177e4 LT |
474 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
475 | return; | |
d3374825 | 476 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
477 | mddev->ctime == 0 && !mddev->hold_active) { |
478 | /* Array is not configured at all, and not held active, | |
479 | * so destroy it */ | |
af8a2434 | 480 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
481 | bs = mddev->bio_set; |
482 | mddev->bio_set = NULL; | |
d3374825 | 483 | if (mddev->gendisk) { |
e804ac78 TH |
484 | /* We did a probe so need to clean up. Call |
485 | * queue_work inside the spinlock so that | |
486 | * flush_workqueue() after mddev_find will | |
487 | * succeed in waiting for the work to be done. | |
d3374825 N |
488 | */ |
489 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 490 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
491 | } else |
492 | kfree(mddev); | |
493 | } | |
494 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
495 | if (bs) |
496 | bioset_free(bs); | |
1da177e4 LT |
497 | } |
498 | ||
fd01b88c | 499 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
500 | { |
501 | mutex_init(&mddev->open_mutex); | |
502 | mutex_init(&mddev->reconfig_mutex); | |
503 | mutex_init(&mddev->bitmap_info.mutex); | |
504 | INIT_LIST_HEAD(&mddev->disks); | |
505 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
506 | init_timer(&mddev->safemode_timer); | |
507 | atomic_set(&mddev->active, 1); | |
508 | atomic_set(&mddev->openers, 0); | |
509 | atomic_set(&mddev->active_io, 0); | |
85572d7c | 510 | spin_lock_init(&mddev->lock); |
fafd7fb0 N |
511 | atomic_set(&mddev->flush_pending, 0); |
512 | init_waitqueue_head(&mddev->sb_wait); | |
513 | init_waitqueue_head(&mddev->recovery_wait); | |
514 | mddev->reshape_position = MaxSector; | |
2c810cdd | 515 | mddev->reshape_backwards = 0; |
c4a39551 | 516 | mddev->last_sync_action = "none"; |
fafd7fb0 N |
517 | mddev->resync_min = 0; |
518 | mddev->resync_max = MaxSector; | |
519 | mddev->level = LEVEL_NONE; | |
520 | } | |
390ee602 | 521 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 522 | |
f72ffdd6 | 523 | static struct mddev *mddev_find(dev_t unit) |
1da177e4 | 524 | { |
fd01b88c | 525 | struct mddev *mddev, *new = NULL; |
1da177e4 | 526 | |
8f5f02c4 N |
527 | if (unit && MAJOR(unit) != MD_MAJOR) |
528 | unit &= ~((1<<MdpMinorShift)-1); | |
529 | ||
1da177e4 LT |
530 | retry: |
531 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
532 | |
533 | if (unit) { | |
534 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
535 | if (mddev->unit == unit) { | |
536 | mddev_get(mddev); | |
537 | spin_unlock(&all_mddevs_lock); | |
538 | kfree(new); | |
539 | return mddev; | |
540 | } | |
541 | ||
542 | if (new) { | |
543 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 544 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
545 | new->hold_active = UNTIL_IOCTL; |
546 | return new; | |
1da177e4 | 547 | } |
efeb53c0 N |
548 | } else if (new) { |
549 | /* find an unused unit number */ | |
550 | static int next_minor = 512; | |
551 | int start = next_minor; | |
552 | int is_free = 0; | |
553 | int dev = 0; | |
554 | while (!is_free) { | |
555 | dev = MKDEV(MD_MAJOR, next_minor); | |
556 | next_minor++; | |
557 | if (next_minor > MINORMASK) | |
558 | next_minor = 0; | |
559 | if (next_minor == start) { | |
560 | /* Oh dear, all in use. */ | |
561 | spin_unlock(&all_mddevs_lock); | |
562 | kfree(new); | |
563 | return NULL; | |
564 | } | |
f72ffdd6 | 565 | |
efeb53c0 N |
566 | is_free = 1; |
567 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
568 | if (mddev->unit == dev) { | |
569 | is_free = 0; | |
570 | break; | |
571 | } | |
572 | } | |
573 | new->unit = dev; | |
574 | new->md_minor = MINOR(dev); | |
575 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
576 | list_add(&new->all_mddevs, &all_mddevs); |
577 | spin_unlock(&all_mddevs_lock); | |
578 | return new; | |
579 | } | |
580 | spin_unlock(&all_mddevs_lock); | |
581 | ||
9ffae0cf | 582 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
583 | if (!new) |
584 | return NULL; | |
585 | ||
1da177e4 LT |
586 | new->unit = unit; |
587 | if (MAJOR(unit) == MD_MAJOR) | |
588 | new->md_minor = MINOR(unit); | |
589 | else | |
590 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
591 | ||
fafd7fb0 | 592 | mddev_init(new); |
1da177e4 | 593 | |
1da177e4 LT |
594 | goto retry; |
595 | } | |
596 | ||
b6eb127d N |
597 | static struct attribute_group md_redundancy_group; |
598 | ||
5c47daf6 | 599 | void mddev_unlock(struct mddev *mddev) |
1da177e4 | 600 | { |
a64c876f | 601 | if (mddev->to_remove) { |
b6eb127d N |
602 | /* These cannot be removed under reconfig_mutex as |
603 | * an access to the files will try to take reconfig_mutex | |
604 | * while holding the file unremovable, which leads to | |
605 | * a deadlock. | |
bb4f1e9d N |
606 | * So hold set sysfs_active while the remove in happeing, |
607 | * and anything else which might set ->to_remove or my | |
608 | * otherwise change the sysfs namespace will fail with | |
609 | * -EBUSY if sysfs_active is still set. | |
610 | * We set sysfs_active under reconfig_mutex and elsewhere | |
611 | * test it under the same mutex to ensure its correct value | |
612 | * is seen. | |
b6eb127d | 613 | */ |
a64c876f N |
614 | struct attribute_group *to_remove = mddev->to_remove; |
615 | mddev->to_remove = NULL; | |
bb4f1e9d | 616 | mddev->sysfs_active = 1; |
b6eb127d N |
617 | mutex_unlock(&mddev->reconfig_mutex); |
618 | ||
00bcb4ac N |
619 | if (mddev->kobj.sd) { |
620 | if (to_remove != &md_redundancy_group) | |
621 | sysfs_remove_group(&mddev->kobj, to_remove); | |
622 | if (mddev->pers == NULL || | |
623 | mddev->pers->sync_request == NULL) { | |
624 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
625 | if (mddev->sysfs_action) | |
626 | sysfs_put(mddev->sysfs_action); | |
627 | mddev->sysfs_action = NULL; | |
628 | } | |
a64c876f | 629 | } |
bb4f1e9d | 630 | mddev->sysfs_active = 0; |
b6eb127d N |
631 | } else |
632 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 633 | |
751e67ca CD |
634 | /* As we've dropped the mutex we need a spinlock to |
635 | * make sure the thread doesn't disappear | |
01f96c0a N |
636 | */ |
637 | spin_lock(&pers_lock); | |
005eca5e | 638 | md_wakeup_thread(mddev->thread); |
01f96c0a | 639 | spin_unlock(&pers_lock); |
1da177e4 | 640 | } |
5c47daf6 | 641 | EXPORT_SYMBOL_GPL(mddev_unlock); |
1da177e4 | 642 | |
1ca69c4b N |
643 | static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr) |
644 | { | |
645 | struct md_rdev *rdev; | |
646 | ||
647 | rdev_for_each_rcu(rdev, mddev) | |
648 | if (rdev->desc_nr == nr) | |
649 | return rdev; | |
650 | ||
651 | return NULL; | |
652 | } | |
653 | ||
654 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 655 | { |
3cb03002 | 656 | struct md_rdev *rdev; |
1da177e4 | 657 | |
dafb20fa | 658 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
659 | if (rdev->bdev->bd_dev == dev) |
660 | return rdev; | |
159ec1fc | 661 | |
1da177e4 LT |
662 | return NULL; |
663 | } | |
664 | ||
1ca69c4b N |
665 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
666 | { | |
667 | struct md_rdev *rdev; | |
668 | ||
669 | rdev_for_each_rcu(rdev, mddev) | |
670 | if (rdev->bdev->bd_dev == dev) | |
671 | return rdev; | |
672 | ||
673 | return NULL; | |
674 | } | |
675 | ||
84fc4b56 | 676 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 677 | { |
84fc4b56 | 678 | struct md_personality *pers; |
d9d166c2 N |
679 | list_for_each_entry(pers, &pers_list, list) { |
680 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 681 | return pers; |
d9d166c2 N |
682 | if (strcmp(pers->name, clevel)==0) |
683 | return pers; | |
684 | } | |
2604b703 N |
685 | return NULL; |
686 | } | |
687 | ||
b73df2d3 | 688 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 689 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 690 | { |
57b2caa3 | 691 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 692 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
693 | } |
694 | ||
f72ffdd6 | 695 | static int alloc_disk_sb(struct md_rdev *rdev) |
1da177e4 | 696 | { |
1da177e4 LT |
697 | rdev->sb_page = alloc_page(GFP_KERNEL); |
698 | if (!rdev->sb_page) { | |
699 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 700 | return -ENOMEM; |
1da177e4 LT |
701 | } |
702 | ||
703 | return 0; | |
704 | } | |
705 | ||
545c8795 | 706 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
707 | { |
708 | if (rdev->sb_page) { | |
2d1f3b5d | 709 | put_page(rdev->sb_page); |
1da177e4 LT |
710 | rdev->sb_loaded = 0; |
711 | rdev->sb_page = NULL; | |
0f420358 | 712 | rdev->sb_start = 0; |
dd8ac336 | 713 | rdev->sectors = 0; |
1da177e4 | 714 | } |
2699b672 N |
715 | if (rdev->bb_page) { |
716 | put_page(rdev->bb_page); | |
717 | rdev->bb_page = NULL; | |
718 | } | |
4fa2f327 N |
719 | kfree(rdev->badblocks.page); |
720 | rdev->badblocks.page = NULL; | |
1da177e4 | 721 | } |
545c8795 | 722 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 723 | |
6712ecf8 | 724 | static void super_written(struct bio *bio, int error) |
7bfa19f2 | 725 | { |
3cb03002 | 726 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 727 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 728 | |
3a0f5bbb N |
729 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
730 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
731 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
732 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 733 | md_error(mddev, rdev); |
3a0f5bbb | 734 | } |
7bfa19f2 | 735 | |
a9701a30 N |
736 | if (atomic_dec_and_test(&mddev->pending_writes)) |
737 | wake_up(&mddev->sb_wait); | |
f8b58edf | 738 | bio_put(bio); |
7bfa19f2 N |
739 | } |
740 | ||
fd01b88c | 741 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
742 | sector_t sector, int size, struct page *page) |
743 | { | |
744 | /* write first size bytes of page to sector of rdev | |
745 | * Increment mddev->pending_writes before returning | |
746 | * and decrement it on completion, waking up sb_wait | |
747 | * if zero is reached. | |
748 | * If an error occurred, call md_error | |
749 | */ | |
a167f663 | 750 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 751 | |
a6ff7e08 | 752 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
4f024f37 | 753 | bio->bi_iter.bi_sector = sector; |
7bfa19f2 N |
754 | bio_add_page(bio, page, size, 0); |
755 | bio->bi_private = rdev; | |
756 | bio->bi_end_io = super_written; | |
a9701a30 | 757 | |
7bfa19f2 | 758 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 759 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
760 | } |
761 | ||
fd01b88c | 762 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 763 | { |
e9c7469b | 764 | /* wait for all superblock writes that were scheduled to complete */ |
1967cd56 | 765 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
7bfa19f2 N |
766 | } |
767 | ||
3cb03002 | 768 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 769 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 770 | { |
a167f663 | 771 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
772 | int ret; |
773 | ||
a6ff7e08 JB |
774 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
775 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 | 776 | if (metadata_op) |
4f024f37 | 777 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
1fdd6fc9 N |
778 | else if (rdev->mddev->reshape_position != MaxSector && |
779 | (rdev->mddev->reshape_backwards == | |
780 | (sector >= rdev->mddev->reshape_position))) | |
4f024f37 | 781 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
ccebd4c4 | 782 | else |
4f024f37 | 783 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
1da177e4 | 784 | bio_add_page(bio, page, size, 0); |
c170bbb4 | 785 | submit_bio_wait(rw, bio); |
1da177e4 LT |
786 | |
787 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
788 | bio_put(bio); | |
789 | return ret; | |
790 | } | |
a8745db2 | 791 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 792 | |
f72ffdd6 | 793 | static int read_disk_sb(struct md_rdev *rdev, int size) |
1da177e4 LT |
794 | { |
795 | char b[BDEVNAME_SIZE]; | |
403df478 | 796 | |
1da177e4 LT |
797 | if (rdev->sb_loaded) |
798 | return 0; | |
799 | ||
ccebd4c4 | 800 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
801 | goto fail; |
802 | rdev->sb_loaded = 1; | |
803 | return 0; | |
804 | ||
805 | fail: | |
806 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
807 | bdevname(rdev->bdev,b)); | |
808 | return -EINVAL; | |
809 | } | |
810 | ||
811 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
812 | { | |
f72ffdd6 | 813 | return sb1->set_uuid0 == sb2->set_uuid0 && |
05710466 AN |
814 | sb1->set_uuid1 == sb2->set_uuid1 && |
815 | sb1->set_uuid2 == sb2->set_uuid2 && | |
816 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
817 | } |
818 | ||
1da177e4 LT |
819 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
820 | { | |
821 | int ret; | |
822 | mdp_super_t *tmp1, *tmp2; | |
823 | ||
824 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
825 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
826 | ||
827 | if (!tmp1 || !tmp2) { | |
828 | ret = 0; | |
35020f1a | 829 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
830 | goto abort; |
831 | } | |
832 | ||
833 | *tmp1 = *sb1; | |
834 | *tmp2 = *sb2; | |
835 | ||
836 | /* | |
837 | * nr_disks is not constant | |
838 | */ | |
839 | tmp1->nr_disks = 0; | |
840 | tmp2->nr_disks = 0; | |
841 | ||
ce0c8e05 | 842 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 843 | abort: |
990a8baf JJ |
844 | kfree(tmp1); |
845 | kfree(tmp2); | |
1da177e4 LT |
846 | return ret; |
847 | } | |
848 | ||
4d167f09 N |
849 | static u32 md_csum_fold(u32 csum) |
850 | { | |
851 | csum = (csum & 0xffff) + (csum >> 16); | |
852 | return (csum & 0xffff) + (csum >> 16); | |
853 | } | |
854 | ||
f72ffdd6 | 855 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
1da177e4 | 856 | { |
4d167f09 N |
857 | u64 newcsum = 0; |
858 | u32 *sb32 = (u32*)sb; | |
859 | int i; | |
1da177e4 LT |
860 | unsigned int disk_csum, csum; |
861 | ||
862 | disk_csum = sb->sb_csum; | |
863 | sb->sb_csum = 0; | |
4d167f09 N |
864 | |
865 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
866 | newcsum += sb32[i]; | |
867 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
868 | ||
4d167f09 N |
869 | #ifdef CONFIG_ALPHA |
870 | /* This used to use csum_partial, which was wrong for several | |
871 | * reasons including that different results are returned on | |
872 | * different architectures. It isn't critical that we get exactly | |
873 | * the same return value as before (we always csum_fold before | |
874 | * testing, and that removes any differences). However as we | |
875 | * know that csum_partial always returned a 16bit value on | |
876 | * alphas, do a fold to maximise conformity to previous behaviour. | |
877 | */ | |
878 | sb->sb_csum = md_csum_fold(disk_csum); | |
879 | #else | |
1da177e4 | 880 | sb->sb_csum = disk_csum; |
4d167f09 | 881 | #endif |
1da177e4 LT |
882 | return csum; |
883 | } | |
884 | ||
1da177e4 LT |
885 | /* |
886 | * Handle superblock details. | |
887 | * We want to be able to handle multiple superblock formats | |
888 | * so we have a common interface to them all, and an array of | |
889 | * different handlers. | |
890 | * We rely on user-space to write the initial superblock, and support | |
891 | * reading and updating of superblocks. | |
892 | * Interface methods are: | |
3cb03002 | 893 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
894 | * loads and validates a superblock on dev. |
895 | * if refdev != NULL, compare superblocks on both devices | |
896 | * Return: | |
897 | * 0 - dev has a superblock that is compatible with refdev | |
898 | * 1 - dev has a superblock that is compatible and newer than refdev | |
899 | * so dev should be used as the refdev in future | |
900 | * -EINVAL superblock incompatible or invalid | |
901 | * -othererror e.g. -EIO | |
902 | * | |
fd01b88c | 903 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
904 | * Verify that dev is acceptable into mddev. |
905 | * The first time, mddev->raid_disks will be 0, and data from | |
906 | * dev should be merged in. Subsequent calls check that dev | |
907 | * is new enough. Return 0 or -EINVAL | |
908 | * | |
fd01b88c | 909 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
910 | * Update the superblock for rdev with data in mddev |
911 | * This does not write to disc. | |
912 | * | |
913 | */ | |
914 | ||
915 | struct super_type { | |
0cd17fec CW |
916 | char *name; |
917 | struct module *owner; | |
c6563a8c N |
918 | int (*load_super)(struct md_rdev *rdev, |
919 | struct md_rdev *refdev, | |
0cd17fec | 920 | int minor_version); |
c6563a8c N |
921 | int (*validate_super)(struct mddev *mddev, |
922 | struct md_rdev *rdev); | |
923 | void (*sync_super)(struct mddev *mddev, | |
924 | struct md_rdev *rdev); | |
3cb03002 | 925 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 926 | sector_t num_sectors); |
c6563a8c N |
927 | int (*allow_new_offset)(struct md_rdev *rdev, |
928 | unsigned long long new_offset); | |
1da177e4 LT |
929 | }; |
930 | ||
0894cc30 AN |
931 | /* |
932 | * Check that the given mddev has no bitmap. | |
933 | * | |
934 | * This function is called from the run method of all personalities that do not | |
935 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
936 | * has a bitmap. Otherwise, it returns 0. | |
937 | * | |
938 | */ | |
fd01b88c | 939 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 940 | { |
c3d9714e | 941 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
942 | return 0; |
943 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
944 | mdname(mddev), mddev->pers->name); | |
945 | return 1; | |
946 | } | |
947 | EXPORT_SYMBOL(md_check_no_bitmap); | |
948 | ||
1da177e4 | 949 | /* |
f72ffdd6 | 950 | * load_super for 0.90.0 |
1da177e4 | 951 | */ |
3cb03002 | 952 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
953 | { |
954 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
955 | mdp_super_t *sb; | |
956 | int ret; | |
1da177e4 LT |
957 | |
958 | /* | |
0f420358 | 959 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
960 | * it's at the end of the disk. |
961 | * | |
962 | * It also happens to be a multiple of 4Kb. | |
963 | */ | |
57b2caa3 | 964 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 965 | |
0002b271 | 966 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
967 | if (ret) return ret; |
968 | ||
969 | ret = -EINVAL; | |
970 | ||
971 | bdevname(rdev->bdev, b); | |
65a06f06 | 972 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
973 | |
974 | if (sb->md_magic != MD_SB_MAGIC) { | |
975 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
976 | b); | |
977 | goto abort; | |
978 | } | |
979 | ||
980 | if (sb->major_version != 0 || | |
f6705578 N |
981 | sb->minor_version < 90 || |
982 | sb->minor_version > 91) { | |
1da177e4 LT |
983 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
984 | sb->major_version, sb->minor_version, | |
985 | b); | |
986 | goto abort; | |
987 | } | |
988 | ||
989 | if (sb->raid_disks <= 0) | |
990 | goto abort; | |
991 | ||
4d167f09 | 992 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
993 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
994 | b); | |
995 | goto abort; | |
996 | } | |
997 | ||
998 | rdev->preferred_minor = sb->md_minor; | |
999 | rdev->data_offset = 0; | |
c6563a8c | 1000 | rdev->new_data_offset = 0; |
0002b271 | 1001 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1002 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1003 | |
1004 | if (sb->level == LEVEL_MULTIPATH) | |
1005 | rdev->desc_nr = -1; | |
1006 | else | |
1007 | rdev->desc_nr = sb->this_disk.number; | |
1008 | ||
9a7b2b0f | 1009 | if (!refdev) { |
1da177e4 | 1010 | ret = 1; |
9a7b2b0f | 1011 | } else { |
1da177e4 | 1012 | __u64 ev1, ev2; |
65a06f06 | 1013 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1014 | if (!uuid_equal(refsb, sb)) { |
1015 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1016 | b, bdevname(refdev->bdev,b2)); | |
1017 | goto abort; | |
1018 | } | |
1019 | if (!sb_equal(refsb, sb)) { | |
1020 | printk(KERN_WARNING "md: %s has same UUID" | |
1021 | " but different superblock to %s\n", | |
1022 | b, bdevname(refdev->bdev, b2)); | |
1023 | goto abort; | |
1024 | } | |
1025 | ev1 = md_event(sb); | |
1026 | ev2 = md_event(refsb); | |
1027 | if (ev1 > ev2) | |
1028 | ret = 1; | |
f72ffdd6 | 1029 | else |
1da177e4 LT |
1030 | ret = 0; |
1031 | } | |
8190e754 | 1032 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1033 | /* Limit to 4TB as metadata cannot record more than that. |
1034 | * (not needed for Linear and RAID0 as metadata doesn't | |
1035 | * record this size) | |
1036 | */ | |
1037 | if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) | |
27a7b260 | 1038 | rdev->sectors = (2ULL << 32) - 2; |
1da177e4 | 1039 | |
27a7b260 | 1040 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1041 | /* "this cannot possibly happen" ... */ |
1042 | ret = -EINVAL; | |
1043 | ||
1da177e4 LT |
1044 | abort: |
1045 | return ret; | |
1046 | } | |
1047 | ||
1048 | /* | |
1049 | * validate_super for 0.90.0 | |
1050 | */ | |
fd01b88c | 1051 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1052 | { |
1053 | mdp_disk_t *desc; | |
65a06f06 | 1054 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1055 | __u64 ev1 = md_event(sb); |
1da177e4 | 1056 | |
41158c7e | 1057 | rdev->raid_disk = -1; |
c5d79adb N |
1058 | clear_bit(Faulty, &rdev->flags); |
1059 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1060 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1061 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1062 | |
1da177e4 LT |
1063 | if (mddev->raid_disks == 0) { |
1064 | mddev->major_version = 0; | |
1065 | mddev->minor_version = sb->minor_version; | |
1066 | mddev->patch_version = sb->patch_version; | |
e691063a | 1067 | mddev->external = 0; |
9d8f0363 | 1068 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1069 | mddev->ctime = sb->ctime; |
1070 | mddev->utime = sb->utime; | |
1071 | mddev->level = sb->level; | |
d9d166c2 | 1072 | mddev->clevel[0] = 0; |
1da177e4 LT |
1073 | mddev->layout = sb->layout; |
1074 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1075 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1076 | mddev->events = ev1; |
c3d9714e | 1077 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1078 | mddev->bitmap_info.space = 0; |
1079 | /* bitmap can use 60 K after the 4K superblocks */ | |
c3d9714e | 1080 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 1081 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
2c810cdd | 1082 | mddev->reshape_backwards = 0; |
1da177e4 | 1083 | |
f6705578 N |
1084 | if (mddev->minor_version >= 91) { |
1085 | mddev->reshape_position = sb->reshape_position; | |
1086 | mddev->delta_disks = sb->delta_disks; | |
1087 | mddev->new_level = sb->new_level; | |
1088 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1089 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1090 | if (mddev->delta_disks < 0) |
1091 | mddev->reshape_backwards = 1; | |
f6705578 N |
1092 | } else { |
1093 | mddev->reshape_position = MaxSector; | |
1094 | mddev->delta_disks = 0; | |
1095 | mddev->new_level = mddev->level; | |
1096 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1097 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1098 | } |
1099 | ||
1da177e4 LT |
1100 | if (sb->state & (1<<MD_SB_CLEAN)) |
1101 | mddev->recovery_cp = MaxSector; | |
1102 | else { | |
f72ffdd6 | 1103 | if (sb->events_hi == sb->cp_events_hi && |
1da177e4 LT |
1104 | sb->events_lo == sb->cp_events_lo) { |
1105 | mddev->recovery_cp = sb->recovery_cp; | |
1106 | } else | |
1107 | mddev->recovery_cp = 0; | |
1108 | } | |
1109 | ||
1110 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1111 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1112 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1113 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1114 | ||
1115 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1116 | |
1117 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
6409bb05 | 1118 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1119 | mddev->bitmap_info.offset = |
1120 | mddev->bitmap_info.default_offset; | |
6409bb05 | 1121 | mddev->bitmap_info.space = |
c9ad020f | 1122 | mddev->bitmap_info.default_space; |
6409bb05 | 1123 | } |
a654b9d8 | 1124 | |
41158c7e | 1125 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1126 | /* Insist on good event counter while assembling, except |
1127 | * for spares (which don't need an event count) */ | |
1da177e4 | 1128 | ++ev1; |
be6800a7 N |
1129 | if (sb->disks[rdev->desc_nr].state & ( |
1130 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
f72ffdd6 | 1131 | if (ev1 < mddev->events) |
be6800a7 | 1132 | return -EINVAL; |
41158c7e N |
1133 | } else if (mddev->bitmap) { |
1134 | /* if adding to array with a bitmap, then we can accept an | |
1135 | * older device ... but not too old. | |
1136 | */ | |
41158c7e N |
1137 | if (ev1 < mddev->bitmap->events_cleared) |
1138 | return 0; | |
8313b8e5 N |
1139 | if (ev1 < mddev->events) |
1140 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1141 | } else { |
1142 | if (ev1 < mddev->events) | |
1143 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1144 | return 0; | |
1145 | } | |
41158c7e | 1146 | |
1da177e4 | 1147 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1148 | desc = sb->disks + rdev->desc_nr; |
1149 | ||
1150 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1151 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1152 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1153 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1154 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1155 | rdev->raid_disk = desc->raid_disk; |
f466722c | 1156 | rdev->saved_raid_disk = desc->raid_disk; |
0261cd9f N |
1157 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1158 | /* active but not in sync implies recovery up to | |
1159 | * reshape position. We don't know exactly where | |
1160 | * that is, so set to zero for now */ | |
1161 | if (mddev->minor_version >= 91) { | |
1162 | rdev->recovery_offset = 0; | |
1163 | rdev->raid_disk = desc->raid_disk; | |
1164 | } | |
1da177e4 | 1165 | } |
8ddf9efe N |
1166 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1167 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1168 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1169 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1170 | return 0; |
1171 | } | |
1172 | ||
1173 | /* | |
1174 | * sync_super for 0.90.0 | |
1175 | */ | |
fd01b88c | 1176 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1177 | { |
1178 | mdp_super_t *sb; | |
3cb03002 | 1179 | struct md_rdev *rdev2; |
1da177e4 | 1180 | int next_spare = mddev->raid_disks; |
19133a42 | 1181 | |
1da177e4 LT |
1182 | /* make rdev->sb match mddev data.. |
1183 | * | |
1184 | * 1/ zero out disks | |
1185 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1186 | * 3/ any empty disks < next_spare become removed | |
1187 | * | |
1188 | * disks[0] gets initialised to REMOVED because | |
1189 | * we cannot be sure from other fields if it has | |
1190 | * been initialised or not. | |
1191 | */ | |
1192 | int i; | |
1193 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1194 | ||
61181565 N |
1195 | rdev->sb_size = MD_SB_BYTES; |
1196 | ||
65a06f06 | 1197 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1198 | |
1199 | memset(sb, 0, sizeof(*sb)); | |
1200 | ||
1201 | sb->md_magic = MD_SB_MAGIC; | |
1202 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1203 | sb->patch_version = mddev->patch_version; |
1204 | sb->gvalid_words = 0; /* ignored */ | |
1205 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1206 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1207 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1208 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1209 | ||
1210 | sb->ctime = mddev->ctime; | |
1211 | sb->level = mddev->level; | |
58c0fed4 | 1212 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1213 | sb->raid_disks = mddev->raid_disks; |
1214 | sb->md_minor = mddev->md_minor; | |
e691063a | 1215 | sb->not_persistent = 0; |
1da177e4 LT |
1216 | sb->utime = mddev->utime; |
1217 | sb->state = 0; | |
1218 | sb->events_hi = (mddev->events>>32); | |
1219 | sb->events_lo = (u32)mddev->events; | |
1220 | ||
f6705578 N |
1221 | if (mddev->reshape_position == MaxSector) |
1222 | sb->minor_version = 90; | |
1223 | else { | |
1224 | sb->minor_version = 91; | |
1225 | sb->reshape_position = mddev->reshape_position; | |
1226 | sb->new_level = mddev->new_level; | |
1227 | sb->delta_disks = mddev->delta_disks; | |
1228 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1229 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1230 | } |
1231 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1232 | if (mddev->in_sync) |
1233 | { | |
1234 | sb->recovery_cp = mddev->recovery_cp; | |
1235 | sb->cp_events_hi = (mddev->events>>32); | |
1236 | sb->cp_events_lo = (u32)mddev->events; | |
1237 | if (mddev->recovery_cp == MaxSector) | |
1238 | sb->state = (1<< MD_SB_CLEAN); | |
1239 | } else | |
1240 | sb->recovery_cp = 0; | |
1241 | ||
1242 | sb->layout = mddev->layout; | |
9d8f0363 | 1243 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1244 | |
c3d9714e | 1245 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1246 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1247 | ||
1da177e4 | 1248 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1249 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1250 | mdp_disk_t *d; |
86e6ffdd | 1251 | int desc_nr; |
0261cd9f N |
1252 | int is_active = test_bit(In_sync, &rdev2->flags); |
1253 | ||
1254 | if (rdev2->raid_disk >= 0 && | |
1255 | sb->minor_version >= 91) | |
1256 | /* we have nowhere to store the recovery_offset, | |
1257 | * but if it is not below the reshape_position, | |
1258 | * we can piggy-back on that. | |
1259 | */ | |
1260 | is_active = 1; | |
1261 | if (rdev2->raid_disk < 0 || | |
1262 | test_bit(Faulty, &rdev2->flags)) | |
1263 | is_active = 0; | |
1264 | if (is_active) | |
86e6ffdd | 1265 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1266 | else |
86e6ffdd | 1267 | desc_nr = next_spare++; |
19133a42 | 1268 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1269 | d = &sb->disks[rdev2->desc_nr]; |
1270 | nr_disks++; | |
1271 | d->number = rdev2->desc_nr; | |
1272 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1273 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1274 | if (is_active) |
1da177e4 LT |
1275 | d->raid_disk = rdev2->raid_disk; |
1276 | else | |
1277 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1278 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1279 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1280 | else if (is_active) { |
1da177e4 | 1281 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1282 | if (test_bit(In_sync, &rdev2->flags)) |
1283 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1284 | active++; |
1285 | working++; | |
1286 | } else { | |
1287 | d->state = 0; | |
1288 | spare++; | |
1289 | working++; | |
1290 | } | |
8ddf9efe N |
1291 | if (test_bit(WriteMostly, &rdev2->flags)) |
1292 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1293 | } |
1da177e4 LT |
1294 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1295 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1296 | mdp_disk_t *d = &sb->disks[i]; | |
1297 | if (d->state == 0 && d->number == 0) { | |
1298 | d->number = i; | |
1299 | d->raid_disk = i; | |
1300 | d->state = (1<<MD_DISK_REMOVED); | |
1301 | d->state |= (1<<MD_DISK_FAULTY); | |
1302 | failed++; | |
1303 | } | |
1304 | } | |
1305 | sb->nr_disks = nr_disks; | |
1306 | sb->active_disks = active; | |
1307 | sb->working_disks = working; | |
1308 | sb->failed_disks = failed; | |
1309 | sb->spare_disks = spare; | |
1310 | ||
1311 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1312 | sb->sb_csum = calc_sb_csum(sb); | |
1313 | } | |
1314 | ||
0cd17fec CW |
1315 | /* |
1316 | * rdev_size_change for 0.90.0 | |
1317 | */ | |
1318 | static unsigned long long | |
3cb03002 | 1319 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1320 | { |
58c0fed4 | 1321 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1322 | return 0; /* component must fit device */ |
c3d9714e | 1323 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1324 | return 0; /* can't move bitmap */ |
57b2caa3 | 1325 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1326 | if (!num_sectors || num_sectors > rdev->sb_start) |
1327 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1328 | /* Limit to 4TB as metadata cannot record more than that. |
1329 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1330 | */ | |
667a5313 | 1331 | if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) |
27a7b260 | 1332 | num_sectors = (2ULL << 32) - 2; |
0f420358 | 1333 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1334 | rdev->sb_page); |
1335 | md_super_wait(rdev->mddev); | |
c26a44ed | 1336 | return num_sectors; |
0cd17fec CW |
1337 | } |
1338 | ||
c6563a8c N |
1339 | static int |
1340 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1341 | { | |
1342 | /* non-zero offset changes not possible with v0.90 */ | |
1343 | return new_offset == 0; | |
1344 | } | |
0cd17fec | 1345 | |
1da177e4 LT |
1346 | /* |
1347 | * version 1 superblock | |
1348 | */ | |
1349 | ||
f72ffdd6 | 1350 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
1da177e4 | 1351 | { |
1c05b4bc N |
1352 | __le32 disk_csum; |
1353 | u32 csum; | |
1da177e4 LT |
1354 | unsigned long long newcsum; |
1355 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1356 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1357 | |
1358 | disk_csum = sb->sb_csum; | |
1359 | sb->sb_csum = 0; | |
1360 | newcsum = 0; | |
1f3c9907 | 1361 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1362 | newcsum += le32_to_cpu(*isuper++); |
1363 | ||
1364 | if (size == 2) | |
1c05b4bc | 1365 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1366 | |
1367 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1368 | sb->sb_csum = disk_csum; | |
1369 | return cpu_to_le32(csum); | |
1370 | } | |
1371 | ||
2699b672 N |
1372 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1373 | int acknowledged); | |
3cb03002 | 1374 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1375 | { |
1376 | struct mdp_superblock_1 *sb; | |
1377 | int ret; | |
0f420358 | 1378 | sector_t sb_start; |
c6563a8c | 1379 | sector_t sectors; |
1da177e4 | 1380 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1381 | int bmask; |
1da177e4 LT |
1382 | |
1383 | /* | |
0f420358 | 1384 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1385 | * It is always aligned to a 4K boundary and |
1386 | * depeding on minor_version, it can be: | |
1387 | * 0: At least 8K, but less than 12K, from end of device | |
1388 | * 1: At start of device | |
1389 | * 2: 4K from start of device. | |
1390 | */ | |
1391 | switch(minor_version) { | |
1392 | case 0: | |
77304d2a | 1393 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1394 | sb_start -= 8*2; |
1395 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1396 | break; |
1397 | case 1: | |
0f420358 | 1398 | sb_start = 0; |
1da177e4 LT |
1399 | break; |
1400 | case 2: | |
0f420358 | 1401 | sb_start = 8; |
1da177e4 LT |
1402 | break; |
1403 | default: | |
1404 | return -EINVAL; | |
1405 | } | |
0f420358 | 1406 | rdev->sb_start = sb_start; |
1da177e4 | 1407 | |
0002b271 N |
1408 | /* superblock is rarely larger than 1K, but it can be larger, |
1409 | * and it is safe to read 4k, so we do that | |
1410 | */ | |
1411 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1412 | if (ret) return ret; |
1413 | ||
65a06f06 | 1414 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1415 | |
1416 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1417 | sb->major_version != cpu_to_le32(1) || | |
1418 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1419 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1420 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1421 | return -EINVAL; |
1422 | ||
1423 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1424 | printk("md: invalid superblock checksum on %s\n", | |
1425 | bdevname(rdev->bdev,b)); | |
1426 | return -EINVAL; | |
1427 | } | |
1428 | if (le64_to_cpu(sb->data_size) < 10) { | |
1429 | printk("md: data_size too small on %s\n", | |
1430 | bdevname(rdev->bdev,b)); | |
1431 | return -EINVAL; | |
1432 | } | |
c6563a8c N |
1433 | if (sb->pad0 || |
1434 | sb->pad3[0] || | |
1435 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1436 | /* Some padding is non-zero, might be a new feature */ | |
1437 | return -EINVAL; | |
e11e93fa | 1438 | |
1da177e4 LT |
1439 | rdev->preferred_minor = 0xffff; |
1440 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1441 | rdev->new_data_offset = rdev->data_offset; |
1442 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1443 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1444 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1445 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1446 | |
0002b271 | 1447 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1448 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1449 | if (rdev->sb_size & bmask) |
a1801f85 N |
1450 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1451 | ||
1452 | if (minor_version | |
0f420358 | 1453 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1454 | return -EINVAL; |
c6563a8c N |
1455 | if (minor_version |
1456 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1457 | return -EINVAL; | |
0002b271 | 1458 | |
31b65a0d N |
1459 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1460 | rdev->desc_nr = -1; | |
1461 | else | |
1462 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1463 | ||
2699b672 N |
1464 | if (!rdev->bb_page) { |
1465 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1466 | if (!rdev->bb_page) | |
1467 | return -ENOMEM; | |
1468 | } | |
1469 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1470 | rdev->badblocks.count == 0) { | |
1471 | /* need to load the bad block list. | |
1472 | * Currently we limit it to one page. | |
1473 | */ | |
1474 | s32 offset; | |
1475 | sector_t bb_sector; | |
1476 | u64 *bbp; | |
1477 | int i; | |
1478 | int sectors = le16_to_cpu(sb->bblog_size); | |
1479 | if (sectors > (PAGE_SIZE / 512)) | |
1480 | return -EINVAL; | |
1481 | offset = le32_to_cpu(sb->bblog_offset); | |
1482 | if (offset == 0) | |
1483 | return -EINVAL; | |
1484 | bb_sector = (long long)offset; | |
1485 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1486 | rdev->bb_page, READ, true)) | |
1487 | return -EIO; | |
1488 | bbp = (u64 *)page_address(rdev->bb_page); | |
1489 | rdev->badblocks.shift = sb->bblog_shift; | |
1490 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1491 | u64 bb = le64_to_cpu(*bbp); | |
1492 | int count = bb & (0x3ff); | |
1493 | u64 sector = bb >> 10; | |
1494 | sector <<= sb->bblog_shift; | |
1495 | count <<= sb->bblog_shift; | |
1496 | if (bb + 1 == 0) | |
1497 | break; | |
1498 | if (md_set_badblocks(&rdev->badblocks, | |
1499 | sector, count, 1) == 0) | |
1500 | return -EINVAL; | |
1501 | } | |
486adf72 N |
1502 | } else if (sb->bblog_offset != 0) |
1503 | rdev->badblocks.shift = 0; | |
2699b672 | 1504 | |
9a7b2b0f | 1505 | if (!refdev) { |
8ed75463 | 1506 | ret = 1; |
9a7b2b0f | 1507 | } else { |
1da177e4 | 1508 | __u64 ev1, ev2; |
65a06f06 | 1509 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1510 | |
1511 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1512 | sb->level != refsb->level || | |
1513 | sb->layout != refsb->layout || | |
1514 | sb->chunksize != refsb->chunksize) { | |
1515 | printk(KERN_WARNING "md: %s has strangely different" | |
1516 | " superblock to %s\n", | |
1517 | bdevname(rdev->bdev,b), | |
1518 | bdevname(refdev->bdev,b2)); | |
1519 | return -EINVAL; | |
1520 | } | |
1521 | ev1 = le64_to_cpu(sb->events); | |
1522 | ev2 = le64_to_cpu(refsb->events); | |
1523 | ||
1524 | if (ev1 > ev2) | |
8ed75463 N |
1525 | ret = 1; |
1526 | else | |
1527 | ret = 0; | |
1da177e4 | 1528 | } |
c6563a8c N |
1529 | if (minor_version) { |
1530 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1531 | sectors -= rdev->data_offset; | |
1532 | } else | |
1533 | sectors = rdev->sb_start; | |
1534 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1535 | return -EINVAL; |
dd8ac336 | 1536 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1537 | return ret; |
1da177e4 LT |
1538 | } |
1539 | ||
fd01b88c | 1540 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1541 | { |
65a06f06 | 1542 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1543 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1544 | |
41158c7e | 1545 | rdev->raid_disk = -1; |
c5d79adb N |
1546 | clear_bit(Faulty, &rdev->flags); |
1547 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1548 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1549 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1550 | |
1da177e4 LT |
1551 | if (mddev->raid_disks == 0) { |
1552 | mddev->major_version = 1; | |
1553 | mddev->patch_version = 0; | |
e691063a | 1554 | mddev->external = 0; |
9d8f0363 | 1555 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1556 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1557 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1558 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1559 | mddev->clevel[0] = 0; |
1da177e4 LT |
1560 | mddev->layout = le32_to_cpu(sb->layout); |
1561 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1562 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1563 | mddev->events = ev1; |
c3d9714e | 1564 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1565 | mddev->bitmap_info.space = 0; |
1566 | /* Default location for bitmap is 1K after superblock | |
1567 | * using 3K - total of 4K | |
1568 | */ | |
c3d9714e | 1569 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1570 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1571 | mddev->reshape_backwards = 0; |
1572 | ||
1da177e4 LT |
1573 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1574 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1575 | ||
1576 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1577 | |
71c0805c | 1578 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1579 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1580 | mddev->bitmap_info.offset = |
1581 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1582 | /* Metadata doesn't record how much space is available. |
1583 | * For 1.0, we assume we can use up to the superblock | |
1584 | * if before, else to 4K beyond superblock. | |
1585 | * For others, assume no change is possible. | |
1586 | */ | |
1587 | if (mddev->minor_version > 0) | |
1588 | mddev->bitmap_info.space = 0; | |
1589 | else if (mddev->bitmap_info.offset > 0) | |
1590 | mddev->bitmap_info.space = | |
1591 | 8 - mddev->bitmap_info.offset; | |
1592 | else | |
1593 | mddev->bitmap_info.space = | |
1594 | -mddev->bitmap_info.offset; | |
1595 | } | |
e11e93fa | 1596 | |
f6705578 N |
1597 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1598 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1599 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1600 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1601 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1602 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1603 | if (mddev->delta_disks < 0 || |
1604 | (mddev->delta_disks == 0 && | |
1605 | (le32_to_cpu(sb->feature_map) | |
1606 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1607 | mddev->reshape_backwards = 1; | |
f6705578 N |
1608 | } else { |
1609 | mddev->reshape_position = MaxSector; | |
1610 | mddev->delta_disks = 0; | |
1611 | mddev->new_level = mddev->level; | |
1612 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1613 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1614 | } |
1615 | ||
41158c7e | 1616 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1617 | /* Insist of good event counter while assembling, except for |
1618 | * spares (which don't need an event count) */ | |
1da177e4 | 1619 | ++ev1; |
be6800a7 N |
1620 | if (rdev->desc_nr >= 0 && |
1621 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1622 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1623 | if (ev1 < mddev->events) | |
1624 | return -EINVAL; | |
41158c7e N |
1625 | } else if (mddev->bitmap) { |
1626 | /* If adding to array with a bitmap, then we can accept an | |
1627 | * older device, but not too old. | |
1628 | */ | |
41158c7e N |
1629 | if (ev1 < mddev->bitmap->events_cleared) |
1630 | return 0; | |
8313b8e5 N |
1631 | if (ev1 < mddev->events) |
1632 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1633 | } else { |
1634 | if (ev1 < mddev->events) | |
1635 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1636 | return 0; | |
1637 | } | |
1da177e4 LT |
1638 | if (mddev->level != LEVEL_MULTIPATH) { |
1639 | int role; | |
3673f305 N |
1640 | if (rdev->desc_nr < 0 || |
1641 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1642 | role = 0xffff; | |
1643 | rdev->desc_nr = -1; | |
1644 | } else | |
1645 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1646 | switch(role) { |
1647 | case 0xffff: /* spare */ | |
1da177e4 LT |
1648 | break; |
1649 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1650 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1651 | break; |
1652 | default: | |
f466722c | 1653 | rdev->saved_raid_disk = role; |
5fd6c1dc | 1654 | if ((le32_to_cpu(sb->feature_map) & |
f466722c | 1655 | MD_FEATURE_RECOVERY_OFFSET)) { |
5fd6c1dc | 1656 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
f466722c N |
1657 | if (!(le32_to_cpu(sb->feature_map) & |
1658 | MD_FEATURE_RECOVERY_BITMAP)) | |
1659 | rdev->saved_raid_disk = -1; | |
1660 | } else | |
5fd6c1dc | 1661 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1662 | rdev->raid_disk = role; |
1663 | break; | |
1664 | } | |
8ddf9efe N |
1665 | if (sb->devflags & WriteMostly1) |
1666 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1667 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1668 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1669 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1670 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1671 | |
1da177e4 LT |
1672 | return 0; |
1673 | } | |
1674 | ||
fd01b88c | 1675 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1676 | { |
1677 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1678 | struct md_rdev *rdev2; |
1da177e4 LT |
1679 | int max_dev, i; |
1680 | /* make rdev->sb match mddev and rdev data. */ | |
1681 | ||
65a06f06 | 1682 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1683 | |
1684 | sb->feature_map = 0; | |
1685 | sb->pad0 = 0; | |
5fd6c1dc | 1686 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1687 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1688 | ||
1689 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1690 | sb->events = cpu_to_le64(mddev->events); | |
1691 | if (mddev->in_sync) | |
1692 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1693 | else | |
1694 | sb->resync_offset = cpu_to_le64(0); | |
1695 | ||
1c05b4bc | 1696 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1697 | |
f0ca340c | 1698 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1699 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1700 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1701 | sb->level = cpu_to_le32(mddev->level); |
1702 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1703 | |
aeb9b211 N |
1704 | if (test_bit(WriteMostly, &rdev->flags)) |
1705 | sb->devflags |= WriteMostly1; | |
1706 | else | |
1707 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1708 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1709 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1710 | |
c3d9714e N |
1711 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1712 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1713 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1714 | } |
5fd6c1dc N |
1715 | |
1716 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1717 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1718 | sb->feature_map |= |
1719 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1720 | sb->recovery_offset = | |
1721 | cpu_to_le64(rdev->recovery_offset); | |
f466722c N |
1722 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
1723 | sb->feature_map |= | |
1724 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); | |
5fd6c1dc | 1725 | } |
2d78f8c4 N |
1726 | if (test_bit(Replacement, &rdev->flags)) |
1727 | sb->feature_map |= | |
1728 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1729 | |
f6705578 N |
1730 | if (mddev->reshape_position != MaxSector) { |
1731 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1732 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1733 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1734 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1735 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1736 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1737 | if (mddev->delta_disks == 0 && |
1738 | mddev->reshape_backwards) | |
1739 | sb->feature_map | |
1740 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1741 | if (rdev->new_data_offset != rdev->data_offset) { |
1742 | sb->feature_map | |
1743 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1744 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1745 | - rdev->data_offset)); | |
1746 | } | |
f6705578 | 1747 | } |
a654b9d8 | 1748 | |
2699b672 N |
1749 | if (rdev->badblocks.count == 0) |
1750 | /* Nothing to do for bad blocks*/ ; | |
1751 | else if (sb->bblog_offset == 0) | |
1752 | /* Cannot record bad blocks on this device */ | |
1753 | md_error(mddev, rdev); | |
1754 | else { | |
1755 | struct badblocks *bb = &rdev->badblocks; | |
1756 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1757 | u64 *p = bb->page; | |
1758 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1759 | if (bb->changed) { | |
1760 | unsigned seq; | |
1761 | ||
1762 | retry: | |
1763 | seq = read_seqbegin(&bb->lock); | |
1764 | ||
1765 | memset(bbp, 0xff, PAGE_SIZE); | |
1766 | ||
1767 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1768 | u64 internal_bb = p[i]; |
2699b672 N |
1769 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1770 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1771 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1772 | } |
d0962936 | 1773 | bb->changed = 0; |
2699b672 N |
1774 | if (read_seqretry(&bb->lock, seq)) |
1775 | goto retry; | |
1776 | ||
1777 | bb->sector = (rdev->sb_start + | |
1778 | (int)le32_to_cpu(sb->bblog_offset)); | |
1779 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1780 | } |
1781 | } | |
1782 | ||
1da177e4 | 1783 | max_dev = 0; |
dafb20fa | 1784 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1785 | if (rdev2->desc_nr+1 > max_dev) |
1786 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1787 | |
70471daf N |
1788 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1789 | int bmask; | |
a778b73f | 1790 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1791 | rdev->sb_size = max_dev * 2 + 256; |
1792 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1793 | if (rdev->sb_size & bmask) | |
1794 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1795 | } else |
1796 | max_dev = le32_to_cpu(sb->max_dev); | |
1797 | ||
1da177e4 LT |
1798 | for (i=0; i<max_dev;i++) |
1799 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
f72ffdd6 | 1800 | |
dafb20fa | 1801 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1802 | i = rdev2->desc_nr; |
b2d444d7 | 1803 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1804 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1805 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1806 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1807 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1808 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1809 | else |
1810 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1811 | } | |
1812 | ||
1da177e4 LT |
1813 | sb->sb_csum = calc_sb_1_csum(sb); |
1814 | } | |
1815 | ||
0cd17fec | 1816 | static unsigned long long |
3cb03002 | 1817 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1818 | { |
1819 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1820 | sector_t max_sectors; |
58c0fed4 | 1821 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1822 | return 0; /* component must fit device */ |
c6563a8c N |
1823 | if (rdev->data_offset != rdev->new_data_offset) |
1824 | return 0; /* too confusing */ | |
0f420358 | 1825 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1826 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1827 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1828 | max_sectors -= rdev->data_offset; |
1829 | if (!num_sectors || num_sectors > max_sectors) | |
1830 | num_sectors = max_sectors; | |
c3d9714e | 1831 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1832 | /* minor version 0 with bitmap we can't move */ |
1833 | return 0; | |
1834 | } else { | |
1835 | /* minor version 0; superblock after data */ | |
0f420358 | 1836 | sector_t sb_start; |
77304d2a | 1837 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1838 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1839 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1840 | if (!num_sectors || num_sectors > max_sectors) |
1841 | num_sectors = max_sectors; | |
0f420358 | 1842 | rdev->sb_start = sb_start; |
0cd17fec | 1843 | } |
65a06f06 | 1844 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1845 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1846 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1847 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1848 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1849 | rdev->sb_page); |
1850 | md_super_wait(rdev->mddev); | |
c26a44ed | 1851 | return num_sectors; |
c6563a8c N |
1852 | |
1853 | } | |
1854 | ||
1855 | static int | |
1856 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1857 | unsigned long long new_offset) | |
1858 | { | |
1859 | /* All necessary checks on new >= old have been done */ | |
1860 | struct bitmap *bitmap; | |
1861 | if (new_offset >= rdev->data_offset) | |
1862 | return 1; | |
1863 | ||
1864 | /* with 1.0 metadata, there is no metadata to tread on | |
1865 | * so we can always move back */ | |
1866 | if (rdev->mddev->minor_version == 0) | |
1867 | return 1; | |
1868 | ||
1869 | /* otherwise we must be sure not to step on | |
1870 | * any metadata, so stay: | |
1871 | * 36K beyond start of superblock | |
1872 | * beyond end of badblocks | |
1873 | * beyond write-intent bitmap | |
1874 | */ | |
1875 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1876 | return 0; | |
1877 | bitmap = rdev->mddev->bitmap; | |
1878 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1879 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 1880 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
1881 | return 0; |
1882 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1883 | return 0; | |
1884 | ||
1885 | return 1; | |
0cd17fec | 1886 | } |
1da177e4 | 1887 | |
75c96f85 | 1888 | static struct super_type super_types[] = { |
1da177e4 LT |
1889 | [0] = { |
1890 | .name = "0.90.0", | |
1891 | .owner = THIS_MODULE, | |
0cd17fec CW |
1892 | .load_super = super_90_load, |
1893 | .validate_super = super_90_validate, | |
1894 | .sync_super = super_90_sync, | |
1895 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1896 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1897 | }, |
1898 | [1] = { | |
1899 | .name = "md-1", | |
1900 | .owner = THIS_MODULE, | |
0cd17fec CW |
1901 | .load_super = super_1_load, |
1902 | .validate_super = super_1_validate, | |
1903 | .sync_super = super_1_sync, | |
1904 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1905 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1906 | }, |
1907 | }; | |
1da177e4 | 1908 | |
fd01b88c | 1909 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1910 | { |
1911 | if (mddev->sync_super) { | |
1912 | mddev->sync_super(mddev, rdev); | |
1913 | return; | |
1914 | } | |
1915 | ||
1916 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1917 | ||
1918 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1919 | } | |
1920 | ||
fd01b88c | 1921 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1922 | { |
3cb03002 | 1923 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1924 | |
4b80991c N |
1925 | rcu_read_lock(); |
1926 | rdev_for_each_rcu(rdev, mddev1) | |
1927 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1928 | if (rdev->bdev->bd_contains == |
4b80991c N |
1929 | rdev2->bdev->bd_contains) { |
1930 | rcu_read_unlock(); | |
7dd5e7c3 | 1931 | return 1; |
4b80991c N |
1932 | } |
1933 | rcu_read_unlock(); | |
1da177e4 LT |
1934 | return 0; |
1935 | } | |
1936 | ||
1937 | static LIST_HEAD(pending_raid_disks); | |
1938 | ||
ac5e7113 AN |
1939 | /* |
1940 | * Try to register data integrity profile for an mddev | |
1941 | * | |
1942 | * This is called when an array is started and after a disk has been kicked | |
1943 | * from the array. It only succeeds if all working and active component devices | |
1944 | * are integrity capable with matching profiles. | |
1945 | */ | |
fd01b88c | 1946 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1947 | { |
3cb03002 | 1948 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1949 | |
1950 | if (list_empty(&mddev->disks)) | |
1951 | return 0; /* nothing to do */ | |
629acb6a JB |
1952 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1953 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 1954 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
1955 | /* skip spares and non-functional disks */ |
1956 | if (test_bit(Faulty, &rdev->flags)) | |
1957 | continue; | |
1958 | if (rdev->raid_disk < 0) | |
1959 | continue; | |
ac5e7113 AN |
1960 | if (!reference) { |
1961 | /* Use the first rdev as the reference */ | |
1962 | reference = rdev; | |
1963 | continue; | |
1964 | } | |
1965 | /* does this rdev's profile match the reference profile? */ | |
1966 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1967 | rdev->bdev->bd_disk) < 0) | |
1968 | return -EINVAL; | |
1969 | } | |
89078d57 MP |
1970 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1971 | return 0; | |
ac5e7113 AN |
1972 | /* |
1973 | * All component devices are integrity capable and have matching | |
1974 | * profiles, register the common profile for the md device. | |
1975 | */ | |
1976 | if (blk_integrity_register(mddev->gendisk, | |
1977 | bdev_get_integrity(reference->bdev)) != 0) { | |
1978 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1979 | mdname(mddev)); | |
1980 | return -EINVAL; | |
1981 | } | |
a91a2785 MP |
1982 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
1983 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
1984 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
1985 | mdname(mddev)); | |
1986 | return -EINVAL; | |
1987 | } | |
ac5e7113 AN |
1988 | return 0; |
1989 | } | |
1990 | EXPORT_SYMBOL(md_integrity_register); | |
1991 | ||
1992 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 1993 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 1994 | { |
2863b9eb JB |
1995 | struct blk_integrity *bi_rdev; |
1996 | struct blk_integrity *bi_mddev; | |
1997 | ||
1998 | if (!mddev->gendisk) | |
1999 | return; | |
2000 | ||
2001 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
2002 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 2003 | |
ac5e7113 | 2004 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 2005 | return; |
ac5e7113 | 2006 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 2007 | return; |
ac5e7113 AN |
2008 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2009 | rdev->bdev->bd_disk) >= 0) | |
2010 | return; | |
2011 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2012 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2013 | } |
ac5e7113 | 2014 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2015 | |
f72ffdd6 | 2016 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 2017 | { |
7dd5e7c3 | 2018 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2019 | struct kobject *ko; |
1edf80d3 | 2020 | char *s; |
5e55e2f5 | 2021 | int err; |
1da177e4 | 2022 | |
11e2ede0 DW |
2023 | /* prevent duplicates */ |
2024 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2025 | return -EEXIST; | |
2026 | ||
dd8ac336 AN |
2027 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2028 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2029 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2030 | if (mddev->pers) { |
2031 | /* Cannot change size, so fail | |
2032 | * If mddev->level <= 0, then we don't care | |
2033 | * about aligning sizes (e.g. linear) | |
2034 | */ | |
2035 | if (mddev->level > 0) | |
2036 | return -ENOSPC; | |
2037 | } else | |
dd8ac336 | 2038 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2039 | } |
1da177e4 LT |
2040 | |
2041 | /* Verify rdev->desc_nr is unique. | |
2042 | * If it is -1, assign a free number, else | |
2043 | * check number is not in use | |
2044 | */ | |
4878e9eb | 2045 | rcu_read_lock(); |
1da177e4 LT |
2046 | if (rdev->desc_nr < 0) { |
2047 | int choice = 0; | |
4878e9eb N |
2048 | if (mddev->pers) |
2049 | choice = mddev->raid_disks; | |
2050 | while (find_rdev_nr_rcu(mddev, choice)) | |
1da177e4 LT |
2051 | choice++; |
2052 | rdev->desc_nr = choice; | |
2053 | } else { | |
4878e9eb N |
2054 | if (find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
2055 | rcu_read_unlock(); | |
1da177e4 | 2056 | return -EBUSY; |
4878e9eb | 2057 | } |
1da177e4 | 2058 | } |
4878e9eb | 2059 | rcu_read_unlock(); |
de01dfad N |
2060 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2061 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2062 | mdname(mddev), mddev->max_disks); | |
2063 | return -EBUSY; | |
2064 | } | |
19133a42 | 2065 | bdevname(rdev->bdev,b); |
649316b2 | 2066 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2067 | *s = '!'; |
649316b2 | 2068 | |
1da177e4 | 2069 | rdev->mddev = mddev; |
19133a42 | 2070 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2071 | |
b2d6db58 | 2072 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2073 | goto fail; |
86e6ffdd | 2074 | |
0762b8bd | 2075 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2076 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2077 | /* failure here is OK */; | |
2078 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2079 | |
4b80991c | 2080 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2081 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2082 | |
2083 | /* May as well allow recovery to be retried once */ | |
5389042f | 2084 | mddev->recovery_disabled++; |
3f9d99c1 | 2085 | |
1da177e4 | 2086 | return 0; |
5e55e2f5 N |
2087 | |
2088 | fail: | |
2089 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2090 | b, mdname(mddev)); | |
2091 | return err; | |
1da177e4 LT |
2092 | } |
2093 | ||
177a99b2 | 2094 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2095 | { |
3cb03002 | 2096 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2097 | kobject_del(&rdev->kobj); |
177a99b2 | 2098 | kobject_put(&rdev->kobj); |
5792a285 N |
2099 | } |
2100 | ||
f72ffdd6 | 2101 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2102 | { |
2103 | char b[BDEVNAME_SIZE]; | |
403df478 | 2104 | |
49731baa | 2105 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2106 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2107 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2108 | rdev->mddev = NULL; | |
86e6ffdd | 2109 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2110 | sysfs_put(rdev->sysfs_state); |
2111 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2112 | rdev->badblocks.count = 0; |
5792a285 | 2113 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2114 | * writing to 'remove' to "dev/state". We also need |
2115 | * to delay it due to rcu usage. | |
5792a285 | 2116 | */ |
4b80991c | 2117 | synchronize_rcu(); |
177a99b2 N |
2118 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2119 | kobject_get(&rdev->kobj); | |
e804ac78 | 2120 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2121 | } |
2122 | ||
2123 | /* | |
2124 | * prevent the device from being mounted, repartitioned or | |
2125 | * otherwise reused by a RAID array (or any other kernel | |
2126 | * subsystem), by bd_claiming the device. | |
2127 | */ | |
3cb03002 | 2128 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2129 | { |
2130 | int err = 0; | |
2131 | struct block_device *bdev; | |
2132 | char b[BDEVNAME_SIZE]; | |
2133 | ||
d4d77629 | 2134 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2135 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2136 | if (IS_ERR(bdev)) { |
2137 | printk(KERN_ERR "md: could not open %s.\n", | |
2138 | __bdevname(dev, b)); | |
2139 | return PTR_ERR(bdev); | |
2140 | } | |
1da177e4 LT |
2141 | rdev->bdev = bdev; |
2142 | return err; | |
2143 | } | |
2144 | ||
3cb03002 | 2145 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2146 | { |
2147 | struct block_device *bdev = rdev->bdev; | |
2148 | rdev->bdev = NULL; | |
e525fd89 | 2149 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2150 | } |
2151 | ||
2152 | void md_autodetect_dev(dev_t dev); | |
2153 | ||
f72ffdd6 | 2154 | static void export_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2155 | { |
2156 | char b[BDEVNAME_SIZE]; | |
403df478 | 2157 | |
1da177e4 LT |
2158 | printk(KERN_INFO "md: export_rdev(%s)\n", |
2159 | bdevname(rdev->bdev,b)); | |
545c8795 | 2160 | md_rdev_clear(rdev); |
1da177e4 | 2161 | #ifndef MODULE |
d0fae18f N |
2162 | if (test_bit(AutoDetected, &rdev->flags)) |
2163 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2164 | #endif |
2165 | unlock_rdev(rdev); | |
86e6ffdd | 2166 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2167 | } |
2168 | ||
f72ffdd6 | 2169 | static void kick_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2170 | { |
2171 | unbind_rdev_from_array(rdev); | |
2172 | export_rdev(rdev); | |
2173 | } | |
2174 | ||
fd01b88c | 2175 | static void export_array(struct mddev *mddev) |
1da177e4 | 2176 | { |
0638bb0e | 2177 | struct md_rdev *rdev; |
1da177e4 | 2178 | |
0638bb0e N |
2179 | while (!list_empty(&mddev->disks)) { |
2180 | rdev = list_first_entry(&mddev->disks, struct md_rdev, | |
2181 | same_set); | |
1da177e4 LT |
2182 | kick_rdev_from_array(rdev); |
2183 | } | |
1da177e4 LT |
2184 | mddev->raid_disks = 0; |
2185 | mddev->major_version = 0; | |
2186 | } | |
2187 | ||
f72ffdd6 | 2188 | static void sync_sbs(struct mddev *mddev, int nospares) |
1da177e4 | 2189 | { |
42543769 N |
2190 | /* Update each superblock (in-memory image), but |
2191 | * if we are allowed to, skip spares which already | |
2192 | * have the right event counter, or have one earlier | |
2193 | * (which would mean they aren't being marked as dirty | |
2194 | * with the rest of the array) | |
2195 | */ | |
3cb03002 | 2196 | struct md_rdev *rdev; |
dafb20fa | 2197 | rdev_for_each(rdev, mddev) { |
42543769 N |
2198 | if (rdev->sb_events == mddev->events || |
2199 | (nospares && | |
2200 | rdev->raid_disk < 0 && | |
42543769 N |
2201 | rdev->sb_events+1 == mddev->events)) { |
2202 | /* Don't update this superblock */ | |
2203 | rdev->sb_loaded = 2; | |
2204 | } else { | |
076f968b | 2205 | sync_super(mddev, rdev); |
42543769 N |
2206 | rdev->sb_loaded = 1; |
2207 | } | |
1da177e4 LT |
2208 | } |
2209 | } | |
2210 | ||
f72ffdd6 | 2211 | static void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2212 | { |
3cb03002 | 2213 | struct md_rdev *rdev; |
06d91a5f | 2214 | int sync_req; |
42543769 | 2215 | int nospares = 0; |
2699b672 | 2216 | int any_badblocks_changed = 0; |
1da177e4 | 2217 | |
d87f064f N |
2218 | if (mddev->ro) { |
2219 | if (force_change) | |
2220 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2221 | return; | |
2222 | } | |
1da177e4 | 2223 | repeat: |
3a3a5ddb | 2224 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2225 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2226 | if (rdev->raid_disk >= 0 && |
2227 | mddev->delta_disks >= 0 && | |
2228 | !test_bit(In_sync, &rdev->flags) && | |
2229 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2230 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2231 | ||
f72ffdd6 | 2232 | } |
bd52b746 | 2233 | if (!mddev->persistent) { |
070dc6dd | 2234 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2235 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2236 | if (!mddev->external) { |
d97a41dc | 2237 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2238 | rdev_for_each(rdev, mddev) { |
de393cde | 2239 | if (rdev->badblocks.changed) { |
d0962936 | 2240 | rdev->badblocks.changed = 0; |
de393cde N |
2241 | md_ack_all_badblocks(&rdev->badblocks); |
2242 | md_error(mddev, rdev); | |
2243 | } | |
2244 | clear_bit(Blocked, &rdev->flags); | |
2245 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2246 | wake_up(&rdev->blocked_wait); | |
2247 | } | |
2248 | } | |
3a3a5ddb N |
2249 | wake_up(&mddev->sb_wait); |
2250 | return; | |
2251 | } | |
2252 | ||
85572d7c | 2253 | spin_lock(&mddev->lock); |
84692195 | 2254 | |
3a3a5ddb N |
2255 | mddev->utime = get_seconds(); |
2256 | ||
850b2b42 N |
2257 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2258 | force_change = 1; | |
2259 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2260 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2261 | * though if events isn't the right even/odd, we will have to do | |
2262 | * spares after all | |
2263 | */ | |
2264 | nospares = 1; | |
2265 | if (force_change) | |
2266 | nospares = 0; | |
2267 | if (mddev->degraded) | |
84692195 N |
2268 | /* If the array is degraded, then skipping spares is both |
2269 | * dangerous and fairly pointless. | |
2270 | * Dangerous because a device that was removed from the array | |
2271 | * might have a event_count that still looks up-to-date, | |
2272 | * so it can be re-added without a resync. | |
2273 | * Pointless because if there are any spares to skip, | |
2274 | * then a recovery will happen and soon that array won't | |
2275 | * be degraded any more and the spare can go back to sleep then. | |
2276 | */ | |
850b2b42 | 2277 | nospares = 0; |
84692195 | 2278 | |
06d91a5f | 2279 | sync_req = mddev->in_sync; |
42543769 N |
2280 | |
2281 | /* If this is just a dirty<->clean transition, and the array is clean | |
2282 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2283 | if (nospares |
42543769 | 2284 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2285 | && mddev->can_decrease_events |
2286 | && mddev->events != 1) { | |
42543769 | 2287 | mddev->events--; |
a8707c08 N |
2288 | mddev->can_decrease_events = 0; |
2289 | } else { | |
42543769 N |
2290 | /* otherwise we have to go forward and ... */ |
2291 | mddev->events ++; | |
a8707c08 | 2292 | mddev->can_decrease_events = nospares; |
42543769 | 2293 | } |
1da177e4 | 2294 | |
403df478 N |
2295 | /* |
2296 | * This 64-bit counter should never wrap. | |
2297 | * Either we are in around ~1 trillion A.C., assuming | |
2298 | * 1 reboot per second, or we have a bug... | |
2299 | */ | |
2300 | WARN_ON(mddev->events == 0); | |
2699b672 | 2301 | |
dafb20fa | 2302 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2303 | if (rdev->badblocks.changed) |
2304 | any_badblocks_changed++; | |
de393cde N |
2305 | if (test_bit(Faulty, &rdev->flags)) |
2306 | set_bit(FaultRecorded, &rdev->flags); | |
2307 | } | |
2699b672 | 2308 | |
e691063a | 2309 | sync_sbs(mddev, nospares); |
85572d7c | 2310 | spin_unlock(&mddev->lock); |
1da177e4 | 2311 | |
36a4e1fe N |
2312 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2313 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2314 | |
4ad13663 | 2315 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2316 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2317 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2318 | |
42543769 N |
2319 | if (rdev->sb_loaded != 1) |
2320 | continue; /* no noise on spare devices */ | |
1da177e4 | 2321 | |
f466722c | 2322 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2323 | md_super_write(mddev,rdev, |
0f420358 | 2324 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2325 | rdev->sb_page); |
36a4e1fe N |
2326 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2327 | bdevname(rdev->bdev, b), | |
2328 | (unsigned long long)rdev->sb_start); | |
42543769 | 2329 | rdev->sb_events = mddev->events; |
2699b672 N |
2330 | if (rdev->badblocks.size) { |
2331 | md_super_write(mddev, rdev, | |
2332 | rdev->badblocks.sector, | |
2333 | rdev->badblocks.size << 9, | |
2334 | rdev->bb_page); | |
2335 | rdev->badblocks.size = 0; | |
2336 | } | |
7bfa19f2 | 2337 | |
f466722c | 2338 | } else |
36a4e1fe N |
2339 | pr_debug("md: %s (skipping faulty)\n", |
2340 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2341 | |
7bfa19f2 | 2342 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2343 | /* only need to write one superblock... */ |
2344 | break; | |
2345 | } | |
a9701a30 | 2346 | md_super_wait(mddev); |
850b2b42 | 2347 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2348 | |
85572d7c | 2349 | spin_lock(&mddev->lock); |
850b2b42 N |
2350 | if (mddev->in_sync != sync_req || |
2351 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2352 | /* have to write it out again */ |
85572d7c | 2353 | spin_unlock(&mddev->lock); |
06d91a5f N |
2354 | goto repeat; |
2355 | } | |
850b2b42 | 2356 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
85572d7c | 2357 | spin_unlock(&mddev->lock); |
3d310eb7 | 2358 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2359 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2360 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2361 | |
dafb20fa | 2362 | rdev_for_each(rdev, mddev) { |
de393cde N |
2363 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2364 | clear_bit(Blocked, &rdev->flags); | |
2365 | ||
2366 | if (any_badblocks_changed) | |
2699b672 | 2367 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2368 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2369 | wake_up(&rdev->blocked_wait); | |
2370 | } | |
1da177e4 LT |
2371 | } |
2372 | ||
7f6ce769 | 2373 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2374 | * We want to accept with case. For this we use cmd_match. |
2375 | */ | |
2376 | static int cmd_match(const char *cmd, const char *str) | |
2377 | { | |
2378 | /* See if cmd, written into a sysfs file, matches | |
2379 | * str. They must either be the same, or cmd can | |
2380 | * have a trailing newline | |
2381 | */ | |
2382 | while (*cmd && *str && *cmd == *str) { | |
2383 | cmd++; | |
2384 | str++; | |
2385 | } | |
2386 | if (*cmd == '\n') | |
2387 | cmd++; | |
2388 | if (*str || *cmd) | |
2389 | return 0; | |
2390 | return 1; | |
2391 | } | |
2392 | ||
86e6ffdd N |
2393 | struct rdev_sysfs_entry { |
2394 | struct attribute attr; | |
3cb03002 N |
2395 | ssize_t (*show)(struct md_rdev *, char *); |
2396 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2397 | }; |
2398 | ||
2399 | static ssize_t | |
3cb03002 | 2400 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2401 | { |
2402 | char *sep = ""; | |
20a49ff6 | 2403 | size_t len = 0; |
758bfc8a | 2404 | unsigned long flags = ACCESS_ONCE(rdev->flags); |
86e6ffdd | 2405 | |
758bfc8a | 2406 | if (test_bit(Faulty, &flags) || |
de393cde | 2407 | rdev->badblocks.unacked_exist) { |
86e6ffdd N |
2408 | len+= sprintf(page+len, "%sfaulty",sep); |
2409 | sep = ","; | |
2410 | } | |
758bfc8a | 2411 | if (test_bit(In_sync, &flags)) { |
86e6ffdd N |
2412 | len += sprintf(page+len, "%sin_sync",sep); |
2413 | sep = ","; | |
2414 | } | |
758bfc8a | 2415 | if (test_bit(WriteMostly, &flags)) { |
f655675b N |
2416 | len += sprintf(page+len, "%swrite_mostly",sep); |
2417 | sep = ","; | |
2418 | } | |
758bfc8a | 2419 | if (test_bit(Blocked, &flags) || |
52c64152 | 2420 | (rdev->badblocks.unacked_exist |
758bfc8a | 2421 | && !test_bit(Faulty, &flags))) { |
6bfe0b49 DW |
2422 | len += sprintf(page+len, "%sblocked", sep); |
2423 | sep = ","; | |
2424 | } | |
758bfc8a N |
2425 | if (!test_bit(Faulty, &flags) && |
2426 | !test_bit(In_sync, &flags)) { | |
86e6ffdd N |
2427 | len += sprintf(page+len, "%sspare", sep); |
2428 | sep = ","; | |
2429 | } | |
758bfc8a | 2430 | if (test_bit(WriteErrorSeen, &flags)) { |
d7a9d443 N |
2431 | len += sprintf(page+len, "%swrite_error", sep); |
2432 | sep = ","; | |
2433 | } | |
758bfc8a | 2434 | if (test_bit(WantReplacement, &flags)) { |
2d78f8c4 N |
2435 | len += sprintf(page+len, "%swant_replacement", sep); |
2436 | sep = ","; | |
2437 | } | |
758bfc8a | 2438 | if (test_bit(Replacement, &flags)) { |
2d78f8c4 N |
2439 | len += sprintf(page+len, "%sreplacement", sep); |
2440 | sep = ","; | |
2441 | } | |
2442 | ||
86e6ffdd N |
2443 | return len+sprintf(page+len, "\n"); |
2444 | } | |
2445 | ||
45dc2de1 | 2446 | static ssize_t |
3cb03002 | 2447 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2448 | { |
2449 | /* can write | |
de393cde | 2450 | * faulty - simulates an error |
45dc2de1 | 2451 | * remove - disconnects the device |
f655675b N |
2452 | * writemostly - sets write_mostly |
2453 | * -writemostly - clears write_mostly | |
de393cde N |
2454 | * blocked - sets the Blocked flags |
2455 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2456 | * insync - sets Insync providing device isn't active |
f466722c N |
2457 | * -insync - clear Insync for a device with a slot assigned, |
2458 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2459 | * write_error - sets WriteErrorSeen |
2460 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2461 | */ |
2462 | int err = -EINVAL; | |
2463 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2464 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2465 | if (test_bit(Faulty, &rdev->flags)) |
2466 | err = 0; | |
2467 | else | |
2468 | err = -EBUSY; | |
45dc2de1 N |
2469 | } else if (cmd_match(buf, "remove")) { |
2470 | if (rdev->raid_disk >= 0) | |
2471 | err = -EBUSY; | |
2472 | else { | |
fd01b88c | 2473 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2474 | kick_rdev_from_array(rdev); |
3f9d7b0d N |
2475 | if (mddev->pers) |
2476 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2477 | md_new_event(mddev); |
2478 | err = 0; | |
2479 | } | |
f655675b N |
2480 | } else if (cmd_match(buf, "writemostly")) { |
2481 | set_bit(WriteMostly, &rdev->flags); | |
2482 | err = 0; | |
2483 | } else if (cmd_match(buf, "-writemostly")) { | |
2484 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2485 | err = 0; |
2486 | } else if (cmd_match(buf, "blocked")) { | |
2487 | set_bit(Blocked, &rdev->flags); | |
2488 | err = 0; | |
2489 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2490 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2491 | rdev->badblocks.unacked_exist) { |
de393cde N |
2492 | /* metadata handler doesn't understand badblocks, |
2493 | * so we need to fail the device | |
2494 | */ | |
2495 | md_error(rdev->mddev, rdev); | |
2496 | } | |
6bfe0b49 | 2497 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2498 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2499 | wake_up(&rdev->blocked_wait); |
2500 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2501 | md_wakeup_thread(rdev->mddev->thread); | |
2502 | ||
6d56e278 N |
2503 | err = 0; |
2504 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2505 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2506 | err = 0; |
f466722c | 2507 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) { |
e1960f8c N |
2508 | if (rdev->mddev->pers == NULL) { |
2509 | clear_bit(In_sync, &rdev->flags); | |
2510 | rdev->saved_raid_disk = rdev->raid_disk; | |
2511 | rdev->raid_disk = -1; | |
2512 | err = 0; | |
2513 | } | |
d7a9d443 N |
2514 | } else if (cmd_match(buf, "write_error")) { |
2515 | set_bit(WriteErrorSeen, &rdev->flags); | |
2516 | err = 0; | |
2517 | } else if (cmd_match(buf, "-write_error")) { | |
2518 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2519 | err = 0; | |
2d78f8c4 N |
2520 | } else if (cmd_match(buf, "want_replacement")) { |
2521 | /* Any non-spare device that is not a replacement can | |
2522 | * become want_replacement at any time, but we then need to | |
2523 | * check if recovery is needed. | |
2524 | */ | |
2525 | if (rdev->raid_disk >= 0 && | |
2526 | !test_bit(Replacement, &rdev->flags)) | |
2527 | set_bit(WantReplacement, &rdev->flags); | |
2528 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2529 | md_wakeup_thread(rdev->mddev->thread); | |
2530 | err = 0; | |
2531 | } else if (cmd_match(buf, "-want_replacement")) { | |
2532 | /* Clearing 'want_replacement' is always allowed. | |
2533 | * Once replacements starts it is too late though. | |
2534 | */ | |
2535 | err = 0; | |
2536 | clear_bit(WantReplacement, &rdev->flags); | |
2537 | } else if (cmd_match(buf, "replacement")) { | |
2538 | /* Can only set a device as a replacement when array has not | |
2539 | * yet been started. Once running, replacement is automatic | |
2540 | * from spares, or by assigning 'slot'. | |
2541 | */ | |
2542 | if (rdev->mddev->pers) | |
2543 | err = -EBUSY; | |
2544 | else { | |
2545 | set_bit(Replacement, &rdev->flags); | |
2546 | err = 0; | |
2547 | } | |
2548 | } else if (cmd_match(buf, "-replacement")) { | |
2549 | /* Similarly, can only clear Replacement before start */ | |
2550 | if (rdev->mddev->pers) | |
2551 | err = -EBUSY; | |
2552 | else { | |
2553 | clear_bit(Replacement, &rdev->flags); | |
2554 | err = 0; | |
2555 | } | |
45dc2de1 | 2556 | } |
00bcb4ac N |
2557 | if (!err) |
2558 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2559 | return err ? err : len; |
2560 | } | |
80ca3a44 | 2561 | static struct rdev_sysfs_entry rdev_state = |
750f199e | 2562 | __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); |
86e6ffdd | 2563 | |
4dbcdc75 | 2564 | static ssize_t |
3cb03002 | 2565 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2566 | { |
2567 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2568 | } | |
2569 | ||
2570 | static ssize_t | |
3cb03002 | 2571 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 N |
2572 | { |
2573 | char *e; | |
2574 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2575 | if (*buf && (*e == 0 || *e == '\n')) { | |
2576 | atomic_set(&rdev->corrected_errors, n); | |
2577 | return len; | |
2578 | } | |
2579 | return -EINVAL; | |
2580 | } | |
2581 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2582 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2583 | |
014236d2 | 2584 | static ssize_t |
3cb03002 | 2585 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2586 | { |
2587 | if (rdev->raid_disk < 0) | |
2588 | return sprintf(page, "none\n"); | |
2589 | else | |
2590 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2591 | } | |
2592 | ||
2593 | static ssize_t | |
3cb03002 | 2594 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 N |
2595 | { |
2596 | char *e; | |
c303da6d | 2597 | int err; |
014236d2 N |
2598 | int slot = simple_strtoul(buf, &e, 10); |
2599 | if (strncmp(buf, "none", 4)==0) | |
2600 | slot = -1; | |
2601 | else if (e==buf || (*e && *e!= '\n')) | |
2602 | return -EINVAL; | |
6c2fce2e | 2603 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2604 | /* Setting 'slot' on an active array requires also |
2605 | * updating the 'rd%d' link, and communicating | |
2606 | * with the personality with ->hot_*_disk. | |
2607 | * For now we only support removing | |
2608 | * failed/spare devices. This normally happens automatically, | |
2609 | * but not when the metadata is externally managed. | |
2610 | */ | |
c303da6d N |
2611 | if (rdev->raid_disk == -1) |
2612 | return -EEXIST; | |
2613 | /* personality does all needed checks */ | |
01393f3d | 2614 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2615 | return -EINVAL; |
746d3207 N |
2616 | clear_bit(Blocked, &rdev->flags); |
2617 | remove_and_add_spares(rdev->mddev, rdev); | |
2618 | if (rdev->raid_disk >= 0) | |
2619 | return -EBUSY; | |
c303da6d N |
2620 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2621 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2622 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2623 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2624 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2625 | */ |
2626 | ||
2627 | if (rdev->raid_disk != -1) | |
2628 | return -EBUSY; | |
2629 | ||
c6751b2b N |
2630 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2631 | return -EBUSY; | |
2632 | ||
6c2fce2e NB |
2633 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2634 | return -EINVAL; | |
2635 | ||
ba1b41b6 N |
2636 | if (slot >= rdev->mddev->raid_disks && |
2637 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2638 | return -ENOSPC; | |
2639 | ||
6c2fce2e NB |
2640 | rdev->raid_disk = slot; |
2641 | if (test_bit(In_sync, &rdev->flags)) | |
2642 | rdev->saved_raid_disk = slot; | |
2643 | else | |
2644 | rdev->saved_raid_disk = -1; | |
d30519fc | 2645 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2646 | clear_bit(Bitmap_sync, &rdev->flags); |
6c2fce2e NB |
2647 | err = rdev->mddev->pers-> |
2648 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2649 | if (err) { |
6c2fce2e | 2650 | rdev->raid_disk = -1; |
6c2fce2e | 2651 | return err; |
52664732 | 2652 | } else |
00bcb4ac | 2653 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2654 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2655 | /* failure here is OK */; |
6c2fce2e | 2656 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2657 | } else { |
ba1b41b6 N |
2658 | if (slot >= rdev->mddev->raid_disks && |
2659 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2660 | return -ENOSPC; |
2661 | rdev->raid_disk = slot; | |
2662 | /* assume it is working */ | |
c5d79adb N |
2663 | clear_bit(Faulty, &rdev->flags); |
2664 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2665 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2666 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2667 | } |
014236d2 N |
2668 | return len; |
2669 | } | |
2670 | ||
014236d2 | 2671 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2672 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2673 | |
93c8cad0 | 2674 | static ssize_t |
3cb03002 | 2675 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2676 | { |
6961ece4 | 2677 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2678 | } |
2679 | ||
2680 | static ssize_t | |
3cb03002 | 2681 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2682 | { |
c6563a8c | 2683 | unsigned long long offset; |
b29bebd6 | 2684 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 2685 | return -EINVAL; |
8ed0a521 | 2686 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2687 | return -EBUSY; |
dd8ac336 | 2688 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2689 | /* Must set offset before size, so overlap checks |
2690 | * can be sane */ | |
2691 | return -EBUSY; | |
93c8cad0 | 2692 | rdev->data_offset = offset; |
25f7fd47 | 2693 | rdev->new_data_offset = offset; |
93c8cad0 N |
2694 | return len; |
2695 | } | |
2696 | ||
2697 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2698 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2699 | |
c6563a8c N |
2700 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2701 | { | |
2702 | return sprintf(page, "%llu\n", | |
2703 | (unsigned long long)rdev->new_data_offset); | |
2704 | } | |
2705 | ||
2706 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2707 | const char *buf, size_t len) | |
2708 | { | |
2709 | unsigned long long new_offset; | |
2710 | struct mddev *mddev = rdev->mddev; | |
2711 | ||
b29bebd6 | 2712 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
2713 | return -EINVAL; |
2714 | ||
f851b60d N |
2715 | if (mddev->sync_thread || |
2716 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
2717 | return -EBUSY; |
2718 | if (new_offset == rdev->data_offset) | |
2719 | /* reset is always permitted */ | |
2720 | ; | |
2721 | else if (new_offset > rdev->data_offset) { | |
2722 | /* must not push array size beyond rdev_sectors */ | |
2723 | if (new_offset - rdev->data_offset | |
2724 | + mddev->dev_sectors > rdev->sectors) | |
2725 | return -E2BIG; | |
2726 | } | |
2727 | /* Metadata worries about other space details. */ | |
2728 | ||
2729 | /* decreasing the offset is inconsistent with a backwards | |
2730 | * reshape. | |
2731 | */ | |
2732 | if (new_offset < rdev->data_offset && | |
2733 | mddev->reshape_backwards) | |
2734 | return -EINVAL; | |
2735 | /* Increasing offset is inconsistent with forwards | |
2736 | * reshape. reshape_direction should be set to | |
2737 | * 'backwards' first. | |
2738 | */ | |
2739 | if (new_offset > rdev->data_offset && | |
2740 | !mddev->reshape_backwards) | |
2741 | return -EINVAL; | |
2742 | ||
2743 | if (mddev->pers && mddev->persistent && | |
2744 | !super_types[mddev->major_version] | |
2745 | .allow_new_offset(rdev, new_offset)) | |
2746 | return -E2BIG; | |
2747 | rdev->new_data_offset = new_offset; | |
2748 | if (new_offset > rdev->data_offset) | |
2749 | mddev->reshape_backwards = 1; | |
2750 | else if (new_offset < rdev->data_offset) | |
2751 | mddev->reshape_backwards = 0; | |
2752 | ||
2753 | return len; | |
2754 | } | |
2755 | static struct rdev_sysfs_entry rdev_new_offset = | |
2756 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2757 | ||
83303b61 | 2758 | static ssize_t |
3cb03002 | 2759 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2760 | { |
dd8ac336 | 2761 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2762 | } |
2763 | ||
c5d79adb N |
2764 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2765 | { | |
2766 | /* check if two start/length pairs overlap */ | |
2767 | if (s1+l1 <= s2) | |
2768 | return 0; | |
2769 | if (s2+l2 <= s1) | |
2770 | return 0; | |
2771 | return 1; | |
2772 | } | |
2773 | ||
b522adcd DW |
2774 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2775 | { | |
2776 | unsigned long long blocks; | |
2777 | sector_t new; | |
2778 | ||
b29bebd6 | 2779 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
2780 | return -EINVAL; |
2781 | ||
2782 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2783 | return -EINVAL; /* sector conversion overflow */ | |
2784 | ||
2785 | new = blocks * 2; | |
2786 | if (new != blocks * 2) | |
2787 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2788 | ||
2789 | *sectors = new; | |
2790 | return 0; | |
2791 | } | |
2792 | ||
83303b61 | 2793 | static ssize_t |
3cb03002 | 2794 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2795 | { |
fd01b88c | 2796 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2797 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2798 | sector_t sectors; |
27c529bb | 2799 | |
b522adcd | 2800 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2801 | return -EINVAL; |
c6563a8c N |
2802 | if (rdev->data_offset != rdev->new_data_offset) |
2803 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2804 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2805 | if (my_mddev->persistent) { |
dd8ac336 AN |
2806 | sectors = super_types[my_mddev->major_version]. |
2807 | rdev_size_change(rdev, sectors); | |
2808 | if (!sectors) | |
0cd17fec | 2809 | return -EBUSY; |
dd8ac336 | 2810 | } else if (!sectors) |
77304d2a | 2811 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2812 | rdev->data_offset; |
a6468539 N |
2813 | if (!my_mddev->pers->resize) |
2814 | /* Cannot change size for RAID0 or Linear etc */ | |
2815 | return -EINVAL; | |
0cd17fec | 2816 | } |
dd8ac336 | 2817 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2818 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2819 | |
dd8ac336 AN |
2820 | rdev->sectors = sectors; |
2821 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
2822 | /* Need to check that all other rdevs with the same |
2823 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
2824 | * the rdev lists safely. | |
2825 | * This check does not provide a hard guarantee, it | |
2826 | * just helps avoid dangerous mistakes. | |
c5d79adb | 2827 | */ |
fd01b88c | 2828 | struct mddev *mddev; |
c5d79adb | 2829 | int overlap = 0; |
159ec1fc | 2830 | struct list_head *tmp; |
c5d79adb | 2831 | |
8b1afc3d | 2832 | rcu_read_lock(); |
29ac4aa3 | 2833 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2834 | struct md_rdev *rdev2; |
c5d79adb | 2835 | |
dafb20fa | 2836 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
2837 | if (rdev->bdev == rdev2->bdev && |
2838 | rdev != rdev2 && | |
2839 | overlaps(rdev->data_offset, rdev->sectors, | |
2840 | rdev2->data_offset, | |
2841 | rdev2->sectors)) { | |
c5d79adb N |
2842 | overlap = 1; |
2843 | break; | |
2844 | } | |
c5d79adb N |
2845 | if (overlap) { |
2846 | mddev_put(mddev); | |
2847 | break; | |
2848 | } | |
2849 | } | |
8b1afc3d | 2850 | rcu_read_unlock(); |
c5d79adb N |
2851 | if (overlap) { |
2852 | /* Someone else could have slipped in a size | |
2853 | * change here, but doing so is just silly. | |
dd8ac336 | 2854 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2855 | * safe, and trust userspace not to race with |
2856 | * itself | |
2857 | */ | |
dd8ac336 | 2858 | rdev->sectors = oldsectors; |
c5d79adb N |
2859 | return -EBUSY; |
2860 | } | |
2861 | } | |
83303b61 N |
2862 | return len; |
2863 | } | |
2864 | ||
2865 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2866 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2867 | |
3cb03002 | 2868 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
2869 | { |
2870 | unsigned long long recovery_start = rdev->recovery_offset; | |
2871 | ||
2872 | if (test_bit(In_sync, &rdev->flags) || | |
2873 | recovery_start == MaxSector) | |
2874 | return sprintf(page, "none\n"); | |
2875 | ||
2876 | return sprintf(page, "%llu\n", recovery_start); | |
2877 | } | |
2878 | ||
3cb03002 | 2879 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
2880 | { |
2881 | unsigned long long recovery_start; | |
2882 | ||
2883 | if (cmd_match(buf, "none")) | |
2884 | recovery_start = MaxSector; | |
b29bebd6 | 2885 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
2886 | return -EINVAL; |
2887 | ||
2888 | if (rdev->mddev->pers && | |
2889 | rdev->raid_disk >= 0) | |
2890 | return -EBUSY; | |
2891 | ||
2892 | rdev->recovery_offset = recovery_start; | |
2893 | if (recovery_start == MaxSector) | |
2894 | set_bit(In_sync, &rdev->flags); | |
2895 | else | |
2896 | clear_bit(In_sync, &rdev->flags); | |
2897 | return len; | |
2898 | } | |
2899 | ||
2900 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2901 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2902 | ||
16c791a5 N |
2903 | static ssize_t |
2904 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2905 | static ssize_t | |
2906 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2907 | ||
3cb03002 | 2908 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2909 | { |
2910 | return badblocks_show(&rdev->badblocks, page, 0); | |
2911 | } | |
3cb03002 | 2912 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 2913 | { |
de393cde N |
2914 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
2915 | /* Maybe that ack was all we needed */ | |
2916 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
2917 | wake_up(&rdev->blocked_wait); | |
2918 | return rv; | |
16c791a5 N |
2919 | } |
2920 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2921 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2922 | ||
3cb03002 | 2923 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2924 | { |
2925 | return badblocks_show(&rdev->badblocks, page, 1); | |
2926 | } | |
3cb03002 | 2927 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
2928 | { |
2929 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2930 | } | |
2931 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
2932 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
2933 | ||
86e6ffdd N |
2934 | static struct attribute *rdev_default_attrs[] = { |
2935 | &rdev_state.attr, | |
4dbcdc75 | 2936 | &rdev_errors.attr, |
014236d2 | 2937 | &rdev_slot.attr, |
93c8cad0 | 2938 | &rdev_offset.attr, |
c6563a8c | 2939 | &rdev_new_offset.attr, |
83303b61 | 2940 | &rdev_size.attr, |
06e3c817 | 2941 | &rdev_recovery_start.attr, |
16c791a5 N |
2942 | &rdev_bad_blocks.attr, |
2943 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
2944 | NULL, |
2945 | }; | |
2946 | static ssize_t | |
2947 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2948 | { | |
2949 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2950 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
86e6ffdd N |
2951 | |
2952 | if (!entry->show) | |
2953 | return -EIO; | |
758bfc8a N |
2954 | if (!rdev->mddev) |
2955 | return -EBUSY; | |
2956 | return entry->show(rdev, page); | |
86e6ffdd N |
2957 | } |
2958 | ||
2959 | static ssize_t | |
2960 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2961 | const char *page, size_t length) | |
2962 | { | |
2963 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2964 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 2965 | ssize_t rv; |
fd01b88c | 2966 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
2967 | |
2968 | if (!entry->store) | |
2969 | return -EIO; | |
67463acb N |
2970 | if (!capable(CAP_SYS_ADMIN)) |
2971 | return -EACCES; | |
27c529bb | 2972 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2973 | if (!rv) { |
27c529bb N |
2974 | if (rdev->mddev == NULL) |
2975 | rv = -EBUSY; | |
2976 | else | |
2977 | rv = entry->store(rdev, page, length); | |
6a51830e | 2978 | mddev_unlock(mddev); |
ca388059 N |
2979 | } |
2980 | return rv; | |
86e6ffdd N |
2981 | } |
2982 | ||
2983 | static void rdev_free(struct kobject *ko) | |
2984 | { | |
3cb03002 | 2985 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
2986 | kfree(rdev); |
2987 | } | |
52cf25d0 | 2988 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2989 | .show = rdev_attr_show, |
2990 | .store = rdev_attr_store, | |
2991 | }; | |
2992 | static struct kobj_type rdev_ktype = { | |
2993 | .release = rdev_free, | |
2994 | .sysfs_ops = &rdev_sysfs_ops, | |
2995 | .default_attrs = rdev_default_attrs, | |
2996 | }; | |
2997 | ||
3cb03002 | 2998 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
2999 | { |
3000 | rdev->desc_nr = -1; | |
3001 | rdev->saved_raid_disk = -1; | |
3002 | rdev->raid_disk = -1; | |
3003 | rdev->flags = 0; | |
3004 | rdev->data_offset = 0; | |
c6563a8c | 3005 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3006 | rdev->sb_events = 0; |
3007 | rdev->last_read_error.tv_sec = 0; | |
3008 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3009 | rdev->sb_loaded = 0; |
3010 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3011 | atomic_set(&rdev->nr_pending, 0); |
3012 | atomic_set(&rdev->read_errors, 0); | |
3013 | atomic_set(&rdev->corrected_errors, 0); | |
3014 | ||
3015 | INIT_LIST_HEAD(&rdev->same_set); | |
3016 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3017 | |
3018 | /* Add space to store bad block list. | |
3019 | * This reserves the space even on arrays where it cannot | |
3020 | * be used - I wonder if that matters | |
3021 | */ | |
3022 | rdev->badblocks.count = 0; | |
486adf72 | 3023 | rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
2230dfe4 N |
3024 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3025 | seqlock_init(&rdev->badblocks.lock); | |
3026 | if (rdev->badblocks.page == NULL) | |
3027 | return -ENOMEM; | |
3028 | ||
3029 | return 0; | |
e8bb9a83 N |
3030 | } |
3031 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3032 | /* |
3033 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3034 | * | |
3035 | * mark the device faulty if: | |
3036 | * | |
3037 | * - the device is nonexistent (zero size) | |
3038 | * - the device has no valid superblock | |
3039 | * | |
3040 | * a faulty rdev _never_ has rdev->sb set. | |
3041 | */ | |
3cb03002 | 3042 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3043 | { |
3044 | char b[BDEVNAME_SIZE]; | |
3045 | int err; | |
3cb03002 | 3046 | struct md_rdev *rdev; |
1da177e4 LT |
3047 | sector_t size; |
3048 | ||
9ffae0cf | 3049 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3050 | if (!rdev) { |
3051 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3052 | return ERR_PTR(-ENOMEM); | |
3053 | } | |
1da177e4 | 3054 | |
2230dfe4 N |
3055 | err = md_rdev_init(rdev); |
3056 | if (err) | |
3057 | goto abort_free; | |
3058 | err = alloc_disk_sb(rdev); | |
3059 | if (err) | |
1da177e4 LT |
3060 | goto abort_free; |
3061 | ||
c5d79adb | 3062 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3063 | if (err) |
3064 | goto abort_free; | |
3065 | ||
f9cb074b | 3066 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3067 | |
77304d2a | 3068 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3069 | if (!size) { |
f72ffdd6 | 3070 | printk(KERN_WARNING |
1da177e4 LT |
3071 | "md: %s has zero or unknown size, marking faulty!\n", |
3072 | bdevname(rdev->bdev,b)); | |
3073 | err = -EINVAL; | |
3074 | goto abort_free; | |
3075 | } | |
3076 | ||
3077 | if (super_format >= 0) { | |
3078 | err = super_types[super_format]. | |
3079 | load_super(rdev, NULL, super_minor); | |
3080 | if (err == -EINVAL) { | |
df968c4e N |
3081 | printk(KERN_WARNING |
3082 | "md: %s does not have a valid v%d.%d " | |
3083 | "superblock, not importing!\n", | |
3084 | bdevname(rdev->bdev,b), | |
3085 | super_format, super_minor); | |
1da177e4 LT |
3086 | goto abort_free; |
3087 | } | |
3088 | if (err < 0) { | |
f72ffdd6 | 3089 | printk(KERN_WARNING |
1da177e4 LT |
3090 | "md: could not read %s's sb, not importing!\n", |
3091 | bdevname(rdev->bdev,b)); | |
3092 | goto abort_free; | |
3093 | } | |
3094 | } | |
6bfe0b49 | 3095 | |
1da177e4 LT |
3096 | return rdev; |
3097 | ||
3098 | abort_free: | |
2699b672 N |
3099 | if (rdev->bdev) |
3100 | unlock_rdev(rdev); | |
545c8795 | 3101 | md_rdev_clear(rdev); |
1da177e4 LT |
3102 | kfree(rdev); |
3103 | return ERR_PTR(err); | |
3104 | } | |
3105 | ||
3106 | /* | |
3107 | * Check a full RAID array for plausibility | |
3108 | */ | |
3109 | ||
f72ffdd6 | 3110 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3111 | { |
3112 | int i; | |
3cb03002 | 3113 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3114 | char b[BDEVNAME_SIZE]; |
3115 | ||
3116 | freshest = NULL; | |
dafb20fa | 3117 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3118 | switch (super_types[mddev->major_version]. |
3119 | load_super(rdev, freshest, mddev->minor_version)) { | |
3120 | case 1: | |
3121 | freshest = rdev; | |
3122 | break; | |
3123 | case 0: | |
3124 | break; | |
3125 | default: | |
3126 | printk( KERN_ERR \ | |
3127 | "md: fatal superblock inconsistency in %s" | |
f72ffdd6 | 3128 | " -- removing from array\n", |
1da177e4 LT |
3129 | bdevname(rdev->bdev,b)); |
3130 | kick_rdev_from_array(rdev); | |
3131 | } | |
3132 | ||
1da177e4 LT |
3133 | super_types[mddev->major_version]. |
3134 | validate_super(mddev, freshest); | |
3135 | ||
3136 | i = 0; | |
dafb20fa | 3137 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3138 | if (mddev->max_disks && |
3139 | (rdev->desc_nr >= mddev->max_disks || | |
3140 | i > mddev->max_disks)) { | |
de01dfad N |
3141 | printk(KERN_WARNING |
3142 | "md: %s: %s: only %d devices permitted\n", | |
3143 | mdname(mddev), bdevname(rdev->bdev, b), | |
3144 | mddev->max_disks); | |
3145 | kick_rdev_from_array(rdev); | |
3146 | continue; | |
3147 | } | |
1da177e4 LT |
3148 | if (rdev != freshest) |
3149 | if (super_types[mddev->major_version]. | |
3150 | validate_super(mddev, rdev)) { | |
3151 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3152 | " from array!\n", | |
3153 | bdevname(rdev->bdev,b)); | |
3154 | kick_rdev_from_array(rdev); | |
3155 | continue; | |
3156 | } | |
3157 | if (mddev->level == LEVEL_MULTIPATH) { | |
3158 | rdev->desc_nr = i++; | |
3159 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3160 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3161 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3162 | rdev->raid_disk = -1; |
3163 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3164 | } |
3165 | } | |
1da177e4 LT |
3166 | } |
3167 | ||
72e02075 N |
3168 | /* Read a fixed-point number. |
3169 | * Numbers in sysfs attributes should be in "standard" units where | |
3170 | * possible, so time should be in seconds. | |
f72ffdd6 | 3171 | * However we internally use a a much smaller unit such as |
72e02075 N |
3172 | * milliseconds or jiffies. |
3173 | * This function takes a decimal number with a possible fractional | |
3174 | * component, and produces an integer which is the result of | |
3175 | * multiplying that number by 10^'scale'. | |
3176 | * all without any floating-point arithmetic. | |
3177 | */ | |
3178 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3179 | { | |
3180 | unsigned long result = 0; | |
3181 | long decimals = -1; | |
3182 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3183 | if (*cp == '.') | |
3184 | decimals = 0; | |
3185 | else if (decimals < scale) { | |
3186 | unsigned int value; | |
3187 | value = *cp - '0'; | |
3188 | result = result * 10 + value; | |
3189 | if (decimals >= 0) | |
3190 | decimals++; | |
3191 | } | |
3192 | cp++; | |
3193 | } | |
3194 | if (*cp == '\n') | |
3195 | cp++; | |
3196 | if (*cp) | |
3197 | return -EINVAL; | |
3198 | if (decimals < 0) | |
3199 | decimals = 0; | |
3200 | while (decimals < scale) { | |
3201 | result *= 10; | |
3202 | decimals ++; | |
3203 | } | |
3204 | *res = result; | |
3205 | return 0; | |
3206 | } | |
3207 | ||
19052c0e N |
3208 | static void md_safemode_timeout(unsigned long data); |
3209 | ||
16f17b39 | 3210 | static ssize_t |
fd01b88c | 3211 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3212 | { |
3213 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3214 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3215 | } | |
3216 | static ssize_t | |
fd01b88c | 3217 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3218 | { |
16f17b39 | 3219 | unsigned long msec; |
97ce0a7f | 3220 | |
72e02075 | 3221 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3222 | return -EINVAL; |
16f17b39 N |
3223 | if (msec == 0) |
3224 | mddev->safemode_delay = 0; | |
3225 | else { | |
19052c0e | 3226 | unsigned long old_delay = mddev->safemode_delay; |
1b30e66f N |
3227 | unsigned long new_delay = (msec*HZ)/1000; |
3228 | ||
3229 | if (new_delay == 0) | |
3230 | new_delay = 1; | |
3231 | mddev->safemode_delay = new_delay; | |
3232 | if (new_delay < old_delay || old_delay == 0) | |
3233 | mod_timer(&mddev->safemode_timer, jiffies+1); | |
16f17b39 N |
3234 | } |
3235 | return len; | |
3236 | } | |
3237 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3238 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3239 | |
eae1701f | 3240 | static ssize_t |
fd01b88c | 3241 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3242 | { |
36d091f4 N |
3243 | struct md_personality *p; |
3244 | int ret; | |
3245 | spin_lock(&mddev->lock); | |
3246 | p = mddev->pers; | |
d9d166c2 | 3247 | if (p) |
36d091f4 | 3248 | ret = sprintf(page, "%s\n", p->name); |
d9d166c2 | 3249 | else if (mddev->clevel[0]) |
36d091f4 | 3250 | ret = sprintf(page, "%s\n", mddev->clevel); |
d9d166c2 | 3251 | else if (mddev->level != LEVEL_NONE) |
36d091f4 | 3252 | ret = sprintf(page, "%d\n", mddev->level); |
d9d166c2 | 3253 | else |
36d091f4 N |
3254 | ret = 0; |
3255 | spin_unlock(&mddev->lock); | |
3256 | return ret; | |
eae1701f N |
3257 | } |
3258 | ||
d9d166c2 | 3259 | static ssize_t |
fd01b88c | 3260 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3261 | { |
f2859af6 | 3262 | char clevel[16]; |
6791875e N |
3263 | ssize_t rv; |
3264 | size_t slen = len; | |
db721d32 | 3265 | struct md_personality *pers, *oldpers; |
f2859af6 | 3266 | long level; |
db721d32 | 3267 | void *priv, *oldpriv; |
3cb03002 | 3268 | struct md_rdev *rdev; |
245f46c2 | 3269 | |
6791875e N |
3270 | if (slen == 0 || slen >= sizeof(clevel)) |
3271 | return -EINVAL; | |
3272 | ||
3273 | rv = mddev_lock(mddev); | |
3274 | if (rv) | |
3275 | return rv; | |
3276 | ||
245f46c2 | 3277 | if (mddev->pers == NULL) { |
6791875e N |
3278 | strncpy(mddev->clevel, buf, slen); |
3279 | if (mddev->clevel[slen-1] == '\n') | |
3280 | slen--; | |
3281 | mddev->clevel[slen] = 0; | |
245f46c2 | 3282 | mddev->level = LEVEL_NONE; |
6791875e N |
3283 | rv = len; |
3284 | goto out_unlock; | |
245f46c2 | 3285 | } |
6791875e | 3286 | rv = -EROFS; |
bd8839e0 | 3287 | if (mddev->ro) |
6791875e | 3288 | goto out_unlock; |
245f46c2 N |
3289 | |
3290 | /* request to change the personality. Need to ensure: | |
3291 | * - array is not engaged in resync/recovery/reshape | |
3292 | * - old personality can be suspended | |
3293 | * - new personality will access other array. | |
3294 | */ | |
3295 | ||
6791875e | 3296 | rv = -EBUSY; |
bb4f1e9d | 3297 | if (mddev->sync_thread || |
f851b60d | 3298 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3299 | mddev->reshape_position != MaxSector || |
3300 | mddev->sysfs_active) | |
6791875e | 3301 | goto out_unlock; |
245f46c2 | 3302 | |
6791875e | 3303 | rv = -EINVAL; |
245f46c2 N |
3304 | if (!mddev->pers->quiesce) { |
3305 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3306 | mdname(mddev), mddev->pers->name); | |
6791875e | 3307 | goto out_unlock; |
245f46c2 N |
3308 | } |
3309 | ||
3310 | /* Now find the new personality */ | |
6791875e N |
3311 | strncpy(clevel, buf, slen); |
3312 | if (clevel[slen-1] == '\n') | |
3313 | slen--; | |
3314 | clevel[slen] = 0; | |
b29bebd6 | 3315 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3316 | level = LEVEL_NONE; |
245f46c2 | 3317 | |
f2859af6 DW |
3318 | if (request_module("md-%s", clevel) != 0) |
3319 | request_module("md-level-%s", clevel); | |
245f46c2 | 3320 | spin_lock(&pers_lock); |
f2859af6 | 3321 | pers = find_pers(level, clevel); |
245f46c2 N |
3322 | if (!pers || !try_module_get(pers->owner)) { |
3323 | spin_unlock(&pers_lock); | |
f2859af6 | 3324 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
6791875e N |
3325 | rv = -EINVAL; |
3326 | goto out_unlock; | |
245f46c2 N |
3327 | } |
3328 | spin_unlock(&pers_lock); | |
3329 | ||
3330 | if (pers == mddev->pers) { | |
3331 | /* Nothing to do! */ | |
3332 | module_put(pers->owner); | |
6791875e N |
3333 | rv = len; |
3334 | goto out_unlock; | |
245f46c2 N |
3335 | } |
3336 | if (!pers->takeover) { | |
3337 | module_put(pers->owner); | |
3338 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3339 | mdname(mddev), clevel); |
6791875e N |
3340 | rv = -EINVAL; |
3341 | goto out_unlock; | |
245f46c2 N |
3342 | } |
3343 | ||
dafb20fa | 3344 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3345 | rdev->new_raid_disk = rdev->raid_disk; |
3346 | ||
245f46c2 N |
3347 | /* ->takeover must set new_* and/or delta_disks |
3348 | * if it succeeds, and may set them when it fails. | |
3349 | */ | |
3350 | priv = pers->takeover(mddev); | |
3351 | if (IS_ERR(priv)) { | |
3352 | mddev->new_level = mddev->level; | |
3353 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3354 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3355 | mddev->raid_disks -= mddev->delta_disks; |
3356 | mddev->delta_disks = 0; | |
2c810cdd | 3357 | mddev->reshape_backwards = 0; |
245f46c2 N |
3358 | module_put(pers->owner); |
3359 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3360 | mdname(mddev), clevel); |
6791875e N |
3361 | rv = PTR_ERR(priv); |
3362 | goto out_unlock; | |
245f46c2 N |
3363 | } |
3364 | ||
3365 | /* Looks like we have a winner */ | |
3366 | mddev_suspend(mddev); | |
5aa61f42 | 3367 | mddev_detach(mddev); |
36d091f4 N |
3368 | |
3369 | spin_lock(&mddev->lock); | |
db721d32 N |
3370 | oldpers = mddev->pers; |
3371 | oldpriv = mddev->private; | |
3372 | mddev->pers = pers; | |
3373 | mddev->private = priv; | |
3374 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3375 | mddev->level = mddev->new_level; | |
3376 | mddev->layout = mddev->new_layout; | |
3377 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
3378 | mddev->delta_disks = 0; | |
3379 | mddev->reshape_backwards = 0; | |
3380 | mddev->degraded = 0; | |
36d091f4 | 3381 | spin_unlock(&mddev->lock); |
db721d32 N |
3382 | |
3383 | if (oldpers->sync_request == NULL && | |
3384 | mddev->external) { | |
3385 | /* We are converting from a no-redundancy array | |
3386 | * to a redundancy array and metadata is managed | |
3387 | * externally so we need to be sure that writes | |
3388 | * won't block due to a need to transition | |
3389 | * clean->dirty | |
3390 | * until external management is started. | |
3391 | */ | |
3392 | mddev->in_sync = 0; | |
3393 | mddev->safemode_delay = 0; | |
3394 | mddev->safemode = 0; | |
3395 | } | |
f72ffdd6 | 3396 | |
db721d32 N |
3397 | oldpers->free(mddev, oldpriv); |
3398 | ||
3399 | if (oldpers->sync_request == NULL && | |
a64c876f N |
3400 | pers->sync_request != NULL) { |
3401 | /* need to add the md_redundancy_group */ | |
3402 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3403 | printk(KERN_WARNING | |
3404 | "md: cannot register extra attributes for %s\n", | |
3405 | mdname(mddev)); | |
388975cc | 3406 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3407 | } |
db721d32 | 3408 | if (oldpers->sync_request != NULL && |
a64c876f N |
3409 | pers->sync_request == NULL) { |
3410 | /* need to remove the md_redundancy_group */ | |
3411 | if (mddev->to_remove == NULL) | |
3412 | mddev->to_remove = &md_redundancy_group; | |
3413 | } | |
3414 | ||
dafb20fa | 3415 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3416 | if (rdev->raid_disk < 0) |
3417 | continue; | |
bf2cb0da | 3418 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3419 | rdev->new_raid_disk = -1; |
3420 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3421 | continue; | |
36fad858 | 3422 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3423 | } |
dafb20fa | 3424 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3425 | if (rdev->raid_disk < 0) |
3426 | continue; | |
3427 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3428 | continue; | |
3429 | rdev->raid_disk = rdev->new_raid_disk; | |
3430 | if (rdev->raid_disk < 0) | |
3a981b03 | 3431 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3432 | else { |
36fad858 NK |
3433 | if (sysfs_link_rdev(mddev, rdev)) |
3434 | printk(KERN_WARNING "md: cannot register rd%d" | |
3435 | " for %s after level change\n", | |
3436 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3437 | } |
e93f68a1 N |
3438 | } |
3439 | ||
db721d32 | 3440 | if (pers->sync_request == NULL) { |
9af204cf TM |
3441 | /* this is now an array without redundancy, so |
3442 | * it must always be in_sync | |
3443 | */ | |
3444 | mddev->in_sync = 1; | |
3445 | del_timer_sync(&mddev->safemode_timer); | |
3446 | } | |
02e5f5c0 | 3447 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3448 | pers->run(mddev); |
245f46c2 | 3449 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3450 | mddev_resume(mddev); |
830778a1 N |
3451 | if (!mddev->thread) |
3452 | md_update_sb(mddev, 1); | |
5cac7861 | 3453 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3454 | md_new_event(mddev); |
6791875e N |
3455 | rv = len; |
3456 | out_unlock: | |
3457 | mddev_unlock(mddev); | |
d9d166c2 N |
3458 | return rv; |
3459 | } | |
3460 | ||
3461 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3462 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3463 | |
d4dbd025 | 3464 | static ssize_t |
fd01b88c | 3465 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3466 | { |
3467 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3468 | if (mddev->reshape_position != MaxSector && |
3469 | mddev->layout != mddev->new_layout) | |
3470 | return sprintf(page, "%d (%d)\n", | |
3471 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3472 | return sprintf(page, "%d\n", mddev->layout); |
3473 | } | |
3474 | ||
3475 | static ssize_t | |
fd01b88c | 3476 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 N |
3477 | { |
3478 | char *e; | |
3479 | unsigned long n = simple_strtoul(buf, &e, 10); | |
6791875e | 3480 | int err; |
d4dbd025 N |
3481 | |
3482 | if (!*buf || (*e && *e != '\n')) | |
3483 | return -EINVAL; | |
6791875e N |
3484 | err = mddev_lock(mddev); |
3485 | if (err) | |
3486 | return err; | |
d4dbd025 | 3487 | |
b3546035 | 3488 | if (mddev->pers) { |
50ac168a | 3489 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3490 | err = -EBUSY; |
3491 | else if (mddev->ro) | |
3492 | err = -EROFS; | |
3493 | else { | |
3494 | mddev->new_layout = n; | |
3495 | err = mddev->pers->check_reshape(mddev); | |
3496 | if (err) | |
3497 | mddev->new_layout = mddev->layout; | |
597a711b | 3498 | } |
b3546035 | 3499 | } else { |
08a02ecd | 3500 | mddev->new_layout = n; |
b3546035 N |
3501 | if (mddev->reshape_position == MaxSector) |
3502 | mddev->layout = n; | |
3503 | } | |
6791875e N |
3504 | mddev_unlock(mddev); |
3505 | return err ?: len; | |
d4dbd025 N |
3506 | } |
3507 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3508 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3509 | |
eae1701f | 3510 | static ssize_t |
fd01b88c | 3511 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3512 | { |
bb636547 N |
3513 | if (mddev->raid_disks == 0) |
3514 | return 0; | |
08a02ecd N |
3515 | if (mddev->reshape_position != MaxSector && |
3516 | mddev->delta_disks != 0) | |
3517 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3518 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3519 | return sprintf(page, "%d\n", mddev->raid_disks); |
3520 | } | |
3521 | ||
fd01b88c | 3522 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3523 | |
3524 | static ssize_t | |
fd01b88c | 3525 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3526 | { |
da943b99 | 3527 | char *e; |
6791875e | 3528 | int err; |
da943b99 N |
3529 | unsigned long n = simple_strtoul(buf, &e, 10); |
3530 | ||
3531 | if (!*buf || (*e && *e != '\n')) | |
3532 | return -EINVAL; | |
3533 | ||
6791875e N |
3534 | err = mddev_lock(mddev); |
3535 | if (err) | |
3536 | return err; | |
da943b99 | 3537 | if (mddev->pers) |
6791875e | 3538 | err = update_raid_disks(mddev, n); |
08a02ecd | 3539 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3540 | struct md_rdev *rdev; |
08a02ecd | 3541 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c | 3542 | |
6791875e | 3543 | err = -EINVAL; |
c6563a8c N |
3544 | rdev_for_each(rdev, mddev) { |
3545 | if (olddisks < n && | |
3546 | rdev->data_offset < rdev->new_data_offset) | |
6791875e | 3547 | goto out_unlock; |
c6563a8c N |
3548 | if (olddisks > n && |
3549 | rdev->data_offset > rdev->new_data_offset) | |
6791875e | 3550 | goto out_unlock; |
c6563a8c | 3551 | } |
6791875e | 3552 | err = 0; |
08a02ecd N |
3553 | mddev->delta_disks = n - olddisks; |
3554 | mddev->raid_disks = n; | |
2c810cdd | 3555 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3556 | } else |
da943b99 | 3557 | mddev->raid_disks = n; |
6791875e N |
3558 | out_unlock: |
3559 | mddev_unlock(mddev); | |
3560 | return err ? err : len; | |
da943b99 N |
3561 | } |
3562 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3563 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3564 | |
3b34380a | 3565 | static ssize_t |
fd01b88c | 3566 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3567 | { |
08a02ecd | 3568 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3569 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3570 | return sprintf(page, "%d (%d)\n", | |
3571 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3572 | mddev->chunk_sectors << 9); |
3573 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3574 | } |
3575 | ||
3576 | static ssize_t | |
fd01b88c | 3577 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3578 | { |
6791875e | 3579 | int err; |
3b34380a N |
3580 | char *e; |
3581 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3582 | ||
3b34380a N |
3583 | if (!*buf || (*e && *e != '\n')) |
3584 | return -EINVAL; | |
3585 | ||
6791875e N |
3586 | err = mddev_lock(mddev); |
3587 | if (err) | |
3588 | return err; | |
b3546035 | 3589 | if (mddev->pers) { |
50ac168a | 3590 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3591 | err = -EBUSY; |
3592 | else if (mddev->ro) | |
3593 | err = -EROFS; | |
3594 | else { | |
3595 | mddev->new_chunk_sectors = n >> 9; | |
3596 | err = mddev->pers->check_reshape(mddev); | |
3597 | if (err) | |
3598 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
597a711b | 3599 | } |
b3546035 | 3600 | } else { |
664e7c41 | 3601 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3602 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3603 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3604 | } |
6791875e N |
3605 | mddev_unlock(mddev); |
3606 | return err ?: len; | |
3b34380a N |
3607 | } |
3608 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3609 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3610 | |
a94213b1 | 3611 | static ssize_t |
fd01b88c | 3612 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3613 | { |
d1a7c503 N |
3614 | if (mddev->recovery_cp == MaxSector) |
3615 | return sprintf(page, "none\n"); | |
a94213b1 N |
3616 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3617 | } | |
3618 | ||
3619 | static ssize_t | |
fd01b88c | 3620 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3621 | { |
6791875e | 3622 | int err; |
a94213b1 N |
3623 | char *e; |
3624 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3625 | ||
6791875e N |
3626 | err = mddev_lock(mddev); |
3627 | if (err) | |
3628 | return err; | |
b098636c | 3629 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6791875e N |
3630 | err = -EBUSY; |
3631 | else if (cmd_match(buf, "none")) | |
06e3c817 DW |
3632 | n = MaxSector; |
3633 | else if (!*buf || (*e && *e != '\n')) | |
6791875e | 3634 | err = -EINVAL; |
a94213b1 | 3635 | |
6791875e N |
3636 | if (!err) { |
3637 | mddev->recovery_cp = n; | |
3638 | if (mddev->pers) | |
3639 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3640 | } | |
3641 | mddev_unlock(mddev); | |
3642 | return err ?: len; | |
a94213b1 N |
3643 | } |
3644 | static struct md_sysfs_entry md_resync_start = | |
750f199e N |
3645 | __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, |
3646 | resync_start_show, resync_start_store); | |
a94213b1 | 3647 | |
9e653b63 N |
3648 | /* |
3649 | * The array state can be: | |
3650 | * | |
3651 | * clear | |
3652 | * No devices, no size, no level | |
3653 | * Equivalent to STOP_ARRAY ioctl | |
3654 | * inactive | |
3655 | * May have some settings, but array is not active | |
3656 | * all IO results in error | |
3657 | * When written, doesn't tear down array, but just stops it | |
3658 | * suspended (not supported yet) | |
3659 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3660 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3661 | * readonly |
3662 | * no resync can happen. no superblocks get written. | |
3663 | * write requests fail | |
3664 | * read-auto | |
3665 | * like readonly, but behaves like 'clean' on a write request. | |
3666 | * | |
3667 | * clean - no pending writes, but otherwise active. | |
3668 | * When written to inactive array, starts without resync | |
3669 | * If a write request arrives then | |
3670 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3671 | * if not known, block and switch to write-pending | |
3672 | * If written to an active array that has pending writes, then fails. | |
3673 | * active | |
3674 | * fully active: IO and resync can be happening. | |
3675 | * When written to inactive array, starts with resync | |
3676 | * | |
3677 | * write-pending | |
3678 | * clean, but writes are blocked waiting for 'active' to be written. | |
3679 | * | |
3680 | * active-idle | |
3681 | * like active, but no writes have been seen for a while (100msec). | |
3682 | * | |
3683 | */ | |
3684 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3685 | write_pending, active_idle, bad_word}; | |
05381954 | 3686 | static char *array_states[] = { |
9e653b63 N |
3687 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3688 | "write-pending", "active-idle", NULL }; | |
3689 | ||
3690 | static int match_word(const char *word, char **list) | |
3691 | { | |
3692 | int n; | |
3693 | for (n=0; list[n]; n++) | |
3694 | if (cmd_match(word, list[n])) | |
3695 | break; | |
3696 | return n; | |
3697 | } | |
3698 | ||
3699 | static ssize_t | |
fd01b88c | 3700 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3701 | { |
3702 | enum array_state st = inactive; | |
3703 | ||
3704 | if (mddev->pers) | |
3705 | switch(mddev->ro) { | |
3706 | case 1: | |
3707 | st = readonly; | |
3708 | break; | |
3709 | case 2: | |
3710 | st = read_auto; | |
3711 | break; | |
3712 | case 0: | |
3713 | if (mddev->in_sync) | |
3714 | st = clean; | |
070dc6dd | 3715 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3716 | st = write_pending; |
9e653b63 N |
3717 | else if (mddev->safemode) |
3718 | st = active_idle; | |
3719 | else | |
3720 | st = active; | |
3721 | } | |
3722 | else { | |
3723 | if (list_empty(&mddev->disks) && | |
3724 | mddev->raid_disks == 0 && | |
58c0fed4 | 3725 | mddev->dev_sectors == 0) |
9e653b63 N |
3726 | st = clear; |
3727 | else | |
3728 | st = inactive; | |
3729 | } | |
3730 | return sprintf(page, "%s\n", array_states[st]); | |
3731 | } | |
3732 | ||
f72ffdd6 N |
3733 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
3734 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
3735 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 3736 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
3737 | |
3738 | static ssize_t | |
fd01b88c | 3739 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 | 3740 | { |
6791875e | 3741 | int err; |
9e653b63 | 3742 | enum array_state st = match_word(buf, array_states); |
6791875e N |
3743 | |
3744 | if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { | |
3745 | /* don't take reconfig_mutex when toggling between | |
3746 | * clean and active | |
3747 | */ | |
3748 | spin_lock(&mddev->lock); | |
3749 | if (st == active) { | |
3750 | restart_array(mddev); | |
3751 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3752 | wake_up(&mddev->sb_wait); | |
3753 | err = 0; | |
3754 | } else /* st == clean */ { | |
3755 | restart_array(mddev); | |
3756 | if (atomic_read(&mddev->writes_pending) == 0) { | |
3757 | if (mddev->in_sync == 0) { | |
3758 | mddev->in_sync = 1; | |
3759 | if (mddev->safemode == 1) | |
3760 | mddev->safemode = 0; | |
3761 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3762 | } | |
3763 | err = 0; | |
3764 | } else | |
3765 | err = -EBUSY; | |
3766 | } | |
3767 | spin_unlock(&mddev->lock); | |
3768 | return err; | |
3769 | } | |
3770 | err = mddev_lock(mddev); | |
3771 | if (err) | |
3772 | return err; | |
3773 | err = -EINVAL; | |
9e653b63 N |
3774 | switch(st) { |
3775 | case bad_word: | |
3776 | break; | |
3777 | case clear: | |
3778 | /* stopping an active array */ | |
a05b7ea0 | 3779 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3780 | break; |
3781 | case inactive: | |
3782 | /* stopping an active array */ | |
90cf195d | 3783 | if (mddev->pers) |
a05b7ea0 | 3784 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3785 | else |
e691063a | 3786 | err = 0; /* already inactive */ |
9e653b63 N |
3787 | break; |
3788 | case suspended: | |
3789 | break; /* not supported yet */ | |
3790 | case readonly: | |
3791 | if (mddev->pers) | |
a05b7ea0 | 3792 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3793 | else { |
3794 | mddev->ro = 1; | |
648b629e | 3795 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3796 | err = do_md_run(mddev); |
3797 | } | |
3798 | break; | |
3799 | case read_auto: | |
9e653b63 | 3800 | if (mddev->pers) { |
80268ee9 | 3801 | if (mddev->ro == 0) |
a05b7ea0 | 3802 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3803 | else if (mddev->ro == 1) |
648b629e N |
3804 | err = restart_array(mddev); |
3805 | if (err == 0) { | |
3806 | mddev->ro = 2; | |
3807 | set_disk_ro(mddev->gendisk, 0); | |
3808 | } | |
9e653b63 N |
3809 | } else { |
3810 | mddev->ro = 2; | |
3811 | err = do_md_run(mddev); | |
3812 | } | |
3813 | break; | |
3814 | case clean: | |
3815 | if (mddev->pers) { | |
3816 | restart_array(mddev); | |
85572d7c | 3817 | spin_lock(&mddev->lock); |
9e653b63 | 3818 | if (atomic_read(&mddev->writes_pending) == 0) { |
e691063a N |
3819 | if (mddev->in_sync == 0) { |
3820 | mddev->in_sync = 1; | |
31a59e34 N |
3821 | if (mddev->safemode == 1) |
3822 | mddev->safemode = 0; | |
070dc6dd | 3823 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3824 | } |
3825 | err = 0; | |
3826 | } else | |
3827 | err = -EBUSY; | |
85572d7c | 3828 | spin_unlock(&mddev->lock); |
5bf29597 N |
3829 | } else |
3830 | err = -EINVAL; | |
9e653b63 N |
3831 | break; |
3832 | case active: | |
3833 | if (mddev->pers) { | |
3834 | restart_array(mddev); | |
070dc6dd | 3835 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3836 | wake_up(&mddev->sb_wait); |
3837 | err = 0; | |
3838 | } else { | |
3839 | mddev->ro = 0; | |
648b629e | 3840 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3841 | err = do_md_run(mddev); |
3842 | } | |
3843 | break; | |
3844 | case write_pending: | |
3845 | case active_idle: | |
3846 | /* these cannot be set */ | |
3847 | break; | |
3848 | } | |
6791875e N |
3849 | |
3850 | if (!err) { | |
1d23f178 N |
3851 | if (mddev->hold_active == UNTIL_IOCTL) |
3852 | mddev->hold_active = 0; | |
00bcb4ac | 3853 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 3854 | } |
6791875e N |
3855 | mddev_unlock(mddev); |
3856 | return err ?: len; | |
9e653b63 | 3857 | } |
80ca3a44 | 3858 | static struct md_sysfs_entry md_array_state = |
750f199e | 3859 | __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); |
9e653b63 | 3860 | |
1e50915f | 3861 | static ssize_t |
fd01b88c | 3862 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3863 | return sprintf(page, "%d\n", |
3864 | atomic_read(&mddev->max_corr_read_errors)); | |
3865 | } | |
3866 | ||
3867 | static ssize_t | |
fd01b88c | 3868 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f RB |
3869 | { |
3870 | char *e; | |
3871 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3872 | ||
3873 | if (*buf && (*e == 0 || *e == '\n')) { | |
3874 | atomic_set(&mddev->max_corr_read_errors, n); | |
3875 | return len; | |
3876 | } | |
3877 | return -EINVAL; | |
3878 | } | |
3879 | ||
3880 | static struct md_sysfs_entry max_corr_read_errors = | |
3881 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3882 | max_corrected_read_errors_store); | |
3883 | ||
6d7ff738 | 3884 | static ssize_t |
fd01b88c | 3885 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3886 | { |
3887 | return -EINVAL; | |
3888 | } | |
3889 | ||
3890 | static ssize_t | |
fd01b88c | 3891 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
3892 | { |
3893 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3894 | /* The new device is added to the array. | |
3895 | * If the array has a persistent superblock, we read the | |
3896 | * superblock to initialise info and check validity. | |
3897 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3898 | * which mainly checks size. | |
3899 | */ | |
3900 | char *e; | |
3901 | int major = simple_strtoul(buf, &e, 10); | |
3902 | int minor; | |
3903 | dev_t dev; | |
3cb03002 | 3904 | struct md_rdev *rdev; |
6d7ff738 N |
3905 | int err; |
3906 | ||
3907 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3908 | return -EINVAL; | |
3909 | minor = simple_strtoul(e+1, &e, 10); | |
3910 | if (*e && *e != '\n') | |
3911 | return -EINVAL; | |
3912 | dev = MKDEV(major, minor); | |
3913 | if (major != MAJOR(dev) || | |
3914 | minor != MINOR(dev)) | |
3915 | return -EOVERFLOW; | |
3916 | ||
6791875e N |
3917 | flush_workqueue(md_misc_wq); |
3918 | ||
3919 | err = mddev_lock(mddev); | |
3920 | if (err) | |
3921 | return err; | |
6d7ff738 N |
3922 | if (mddev->persistent) { |
3923 | rdev = md_import_device(dev, mddev->major_version, | |
3924 | mddev->minor_version); | |
3925 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
3926 | struct md_rdev *rdev0 |
3927 | = list_entry(mddev->disks.next, | |
3928 | struct md_rdev, same_set); | |
6d7ff738 N |
3929 | err = super_types[mddev->major_version] |
3930 | .load_super(rdev, rdev0, mddev->minor_version); | |
3931 | if (err < 0) | |
3932 | goto out; | |
3933 | } | |
c5d79adb N |
3934 | } else if (mddev->external) |
3935 | rdev = md_import_device(dev, -2, -1); | |
3936 | else | |
6d7ff738 N |
3937 | rdev = md_import_device(dev, -1, -1); |
3938 | ||
3939 | if (IS_ERR(rdev)) | |
3940 | return PTR_ERR(rdev); | |
3941 | err = bind_rdev_to_array(rdev, mddev); | |
3942 | out: | |
3943 | if (err) | |
3944 | export_rdev(rdev); | |
6791875e | 3945 | mddev_unlock(mddev); |
6d7ff738 N |
3946 | return err ? err : len; |
3947 | } | |
3948 | ||
3949 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3950 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3951 | |
9b1d1dac | 3952 | static ssize_t |
fd01b88c | 3953 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
3954 | { |
3955 | char *end; | |
3956 | unsigned long chunk, end_chunk; | |
6791875e | 3957 | int err; |
9b1d1dac | 3958 | |
6791875e N |
3959 | err = mddev_lock(mddev); |
3960 | if (err) | |
3961 | return err; | |
9b1d1dac PC |
3962 | if (!mddev->bitmap) |
3963 | goto out; | |
3964 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3965 | while (*buf) { | |
3966 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3967 | if (buf == end) break; | |
3968 | if (*end == '-') { /* range */ | |
3969 | buf = end + 1; | |
3970 | end_chunk = simple_strtoul(buf, &end, 0); | |
3971 | if (buf == end) break; | |
3972 | } | |
3973 | if (*end && !isspace(*end)) break; | |
3974 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3975 | buf = skip_spaces(end); |
9b1d1dac PC |
3976 | } |
3977 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3978 | out: | |
6791875e | 3979 | mddev_unlock(mddev); |
9b1d1dac PC |
3980 | return len; |
3981 | } | |
3982 | ||
3983 | static struct md_sysfs_entry md_bitmap = | |
3984 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3985 | ||
a35b0d69 | 3986 | static ssize_t |
fd01b88c | 3987 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 3988 | { |
58c0fed4 AN |
3989 | return sprintf(page, "%llu\n", |
3990 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3991 | } |
3992 | ||
fd01b88c | 3993 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
3994 | |
3995 | static ssize_t | |
fd01b88c | 3996 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
3997 | { |
3998 | /* If array is inactive, we can reduce the component size, but | |
3999 | * not increase it (except from 0). | |
4000 | * If array is active, we can try an on-line resize | |
4001 | */ | |
b522adcd DW |
4002 | sector_t sectors; |
4003 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 4004 | |
58c0fed4 AN |
4005 | if (err < 0) |
4006 | return err; | |
6791875e N |
4007 | err = mddev_lock(mddev); |
4008 | if (err) | |
4009 | return err; | |
a35b0d69 | 4010 | if (mddev->pers) { |
58c0fed4 | 4011 | err = update_size(mddev, sectors); |
850b2b42 | 4012 | md_update_sb(mddev, 1); |
a35b0d69 | 4013 | } else { |
58c0fed4 AN |
4014 | if (mddev->dev_sectors == 0 || |
4015 | mddev->dev_sectors > sectors) | |
4016 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
4017 | else |
4018 | err = -ENOSPC; | |
4019 | } | |
6791875e | 4020 | mddev_unlock(mddev); |
a35b0d69 N |
4021 | return err ? err : len; |
4022 | } | |
4023 | ||
4024 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 4025 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 4026 | |
83f0d77a | 4027 | /* Metadata version. |
e691063a N |
4028 | * This is one of |
4029 | * 'none' for arrays with no metadata (good luck...) | |
4030 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
4031 | * or N.M for internally known formats |
4032 | */ | |
4033 | static ssize_t | |
fd01b88c | 4034 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
4035 | { |
4036 | if (mddev->persistent) | |
4037 | return sprintf(page, "%d.%d\n", | |
4038 | mddev->major_version, mddev->minor_version); | |
e691063a N |
4039 | else if (mddev->external) |
4040 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
4041 | else |
4042 | return sprintf(page, "none\n"); | |
4043 | } | |
4044 | ||
4045 | static ssize_t | |
fd01b88c | 4046 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
4047 | { |
4048 | int major, minor; | |
4049 | char *e; | |
6791875e | 4050 | int err; |
ea43ddd8 N |
4051 | /* Changing the details of 'external' metadata is |
4052 | * always permitted. Otherwise there must be | |
4053 | * no devices attached to the array. | |
4054 | */ | |
6791875e N |
4055 | |
4056 | err = mddev_lock(mddev); | |
4057 | if (err) | |
4058 | return err; | |
4059 | err = -EBUSY; | |
ea43ddd8 N |
4060 | if (mddev->external && strncmp(buf, "external:", 9) == 0) |
4061 | ; | |
4062 | else if (!list_empty(&mddev->disks)) | |
6791875e | 4063 | goto out_unlock; |
8bb93aac | 4064 | |
6791875e | 4065 | err = 0; |
8bb93aac N |
4066 | if (cmd_match(buf, "none")) { |
4067 | mddev->persistent = 0; | |
e691063a N |
4068 | mddev->external = 0; |
4069 | mddev->major_version = 0; | |
4070 | mddev->minor_version = 90; | |
6791875e | 4071 | goto out_unlock; |
e691063a N |
4072 | } |
4073 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4074 | size_t namelen = len-9; |
e691063a N |
4075 | if (namelen >= sizeof(mddev->metadata_type)) |
4076 | namelen = sizeof(mddev->metadata_type)-1; | |
4077 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4078 | mddev->metadata_type[namelen] = 0; | |
4079 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4080 | mddev->metadata_type[--namelen] = 0; | |
4081 | mddev->persistent = 0; | |
4082 | mddev->external = 1; | |
8bb93aac N |
4083 | mddev->major_version = 0; |
4084 | mddev->minor_version = 90; | |
6791875e | 4085 | goto out_unlock; |
8bb93aac N |
4086 | } |
4087 | major = simple_strtoul(buf, &e, 10); | |
6791875e | 4088 | err = -EINVAL; |
8bb93aac | 4089 | if (e==buf || *e != '.') |
6791875e | 4090 | goto out_unlock; |
8bb93aac N |
4091 | buf = e+1; |
4092 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4093 | if (e==buf || (*e && *e != '\n') ) |
6791875e N |
4094 | goto out_unlock; |
4095 | err = -ENOENT; | |
50511da3 | 4096 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
6791875e | 4097 | goto out_unlock; |
8bb93aac N |
4098 | mddev->major_version = major; |
4099 | mddev->minor_version = minor; | |
4100 | mddev->persistent = 1; | |
e691063a | 4101 | mddev->external = 0; |
6791875e N |
4102 | err = 0; |
4103 | out_unlock: | |
4104 | mddev_unlock(mddev); | |
4105 | return err ?: len; | |
8bb93aac N |
4106 | } |
4107 | ||
4108 | static struct md_sysfs_entry md_metadata = | |
750f199e | 4109 | __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4110 | |
24dd469d | 4111 | static ssize_t |
fd01b88c | 4112 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4113 | { |
7eec314d | 4114 | char *type = "idle"; |
b7b17c9b N |
4115 | unsigned long recovery = mddev->recovery; |
4116 | if (test_bit(MD_RECOVERY_FROZEN, &recovery)) | |
b6a9ce68 | 4117 | type = "frozen"; |
b7b17c9b N |
4118 | else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || |
4119 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { | |
4120 | if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) | |
ccfcc3c1 | 4121 | type = "reshape"; |
b7b17c9b N |
4122 | else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { |
4123 | if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) | |
24dd469d | 4124 | type = "resync"; |
b7b17c9b | 4125 | else if (test_bit(MD_RECOVERY_CHECK, &recovery)) |
24dd469d N |
4126 | type = "check"; |
4127 | else | |
4128 | type = "repair"; | |
b7b17c9b | 4129 | } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) |
24dd469d N |
4130 | type = "recover"; |
4131 | } | |
4132 | return sprintf(page, "%s\n", type); | |
4133 | } | |
4134 | ||
4135 | static ssize_t | |
fd01b88c | 4136 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4137 | { |
7eec314d N |
4138 | if (!mddev->pers || !mddev->pers->sync_request) |
4139 | return -EINVAL; | |
4140 | ||
b6a9ce68 N |
4141 | if (cmd_match(page, "frozen")) |
4142 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4143 | else | |
4144 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4145 | ||
4146 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
f851b60d | 4147 | flush_workqueue(md_misc_wq); |
7eec314d N |
4148 | if (mddev->sync_thread) { |
4149 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6791875e N |
4150 | if (mddev_lock(mddev) == 0) { |
4151 | md_reap_sync_thread(mddev); | |
4152 | mddev_unlock(mddev); | |
4153 | } | |
7eec314d | 4154 | } |
03c902e1 N |
4155 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4156 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4157 | return -EBUSY; |
72a23c21 NB |
4158 | else if (cmd_match(page, "resync")) |
4159 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4160 | else if (cmd_match(page, "recover")) { | |
4161 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4162 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4163 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4164 | int err; |
4165 | if (mddev->pers->start_reshape == NULL) | |
4166 | return -EINVAL; | |
6791875e N |
4167 | err = mddev_lock(mddev); |
4168 | if (!err) { | |
4169 | err = mddev->pers->start_reshape(mddev); | |
4170 | mddev_unlock(mddev); | |
4171 | } | |
16484bf5 N |
4172 | if (err) |
4173 | return err; | |
a99ac971 | 4174 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4175 | } else { |
bce74dac | 4176 | if (cmd_match(page, "check")) |
7eec314d | 4177 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4178 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4179 | return -EINVAL; |
4180 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4181 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4182 | } |
48c26ddc N |
4183 | if (mddev->ro == 2) { |
4184 | /* A write to sync_action is enough to justify | |
4185 | * canceling read-auto mode | |
4186 | */ | |
4187 | mddev->ro = 0; | |
4188 | md_wakeup_thread(mddev->sync_thread); | |
4189 | } | |
03c902e1 | 4190 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4191 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4192 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4193 | return len; |
4194 | } | |
4195 | ||
c4a39551 | 4196 | static struct md_sysfs_entry md_scan_mode = |
750f199e | 4197 | __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
c4a39551 JB |
4198 | |
4199 | static ssize_t | |
4200 | last_sync_action_show(struct mddev *mddev, char *page) | |
4201 | { | |
4202 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4203 | } | |
4204 | ||
4205 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4206 | ||
9d88883e | 4207 | static ssize_t |
fd01b88c | 4208 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4209 | { |
4210 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4211 | (unsigned long long) |
4212 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4213 | } |
4214 | ||
80ca3a44 | 4215 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4216 | |
88202a0c | 4217 | static ssize_t |
fd01b88c | 4218 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4219 | { |
4220 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4221 | mddev->sync_speed_min ? "local": "system"); | |
4222 | } | |
4223 | ||
4224 | static ssize_t | |
fd01b88c | 4225 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4226 | { |
4227 | int min; | |
4228 | char *e; | |
4229 | if (strncmp(buf, "system", 6)==0) { | |
4230 | mddev->sync_speed_min = 0; | |
4231 | return len; | |
4232 | } | |
4233 | min = simple_strtoul(buf, &e, 10); | |
4234 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4235 | return -EINVAL; | |
4236 | mddev->sync_speed_min = min; | |
4237 | return len; | |
4238 | } | |
4239 | ||
4240 | static struct md_sysfs_entry md_sync_min = | |
4241 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4242 | ||
4243 | static ssize_t | |
fd01b88c | 4244 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4245 | { |
4246 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4247 | mddev->sync_speed_max ? "local": "system"); | |
4248 | } | |
4249 | ||
4250 | static ssize_t | |
fd01b88c | 4251 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4252 | { |
4253 | int max; | |
4254 | char *e; | |
4255 | if (strncmp(buf, "system", 6)==0) { | |
4256 | mddev->sync_speed_max = 0; | |
4257 | return len; | |
4258 | } | |
4259 | max = simple_strtoul(buf, &e, 10); | |
4260 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4261 | return -EINVAL; | |
4262 | mddev->sync_speed_max = max; | |
4263 | return len; | |
4264 | } | |
4265 | ||
4266 | static struct md_sysfs_entry md_sync_max = | |
4267 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4268 | ||
d7f3d291 | 4269 | static ssize_t |
fd01b88c | 4270 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4271 | { |
4272 | return sprintf(page, "%d\n", mddev->degraded); | |
4273 | } | |
4274 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4275 | |
90b08710 | 4276 | static ssize_t |
fd01b88c | 4277 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4278 | { |
4279 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4280 | } | |
4281 | ||
4282 | static ssize_t | |
fd01b88c | 4283 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4284 | { |
4285 | long n; | |
4286 | ||
b29bebd6 | 4287 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4288 | return -EINVAL; |
4289 | ||
4290 | if (n != 0 && n != 1) | |
4291 | return -EINVAL; | |
4292 | ||
4293 | mddev->parallel_resync = n; | |
4294 | ||
4295 | if (mddev->sync_thread) | |
4296 | wake_up(&resync_wait); | |
4297 | ||
4298 | return len; | |
4299 | } | |
4300 | ||
4301 | /* force parallel resync, even with shared block devices */ | |
4302 | static struct md_sysfs_entry md_sync_force_parallel = | |
4303 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4304 | sync_force_parallel_show, sync_force_parallel_store); | |
4305 | ||
88202a0c | 4306 | static ssize_t |
fd01b88c | 4307 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4308 | { |
4309 | unsigned long resync, dt, db; | |
d1a7c503 N |
4310 | if (mddev->curr_resync == 0) |
4311 | return sprintf(page, "none\n"); | |
9687a60c AN |
4312 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4313 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4314 | if (!dt) dt++; |
9687a60c AN |
4315 | db = resync - mddev->resync_mark_cnt; |
4316 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4317 | } |
4318 | ||
80ca3a44 | 4319 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4320 | |
4321 | static ssize_t | |
fd01b88c | 4322 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4323 | { |
13ae864b | 4324 | unsigned long long max_sectors, resync; |
88202a0c | 4325 | |
acb180b0 N |
4326 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4327 | return sprintf(page, "none\n"); | |
4328 | ||
72f36d59 N |
4329 | if (mddev->curr_resync == 1 || |
4330 | mddev->curr_resync == 2) | |
4331 | return sprintf(page, "delayed\n"); | |
4332 | ||
c804cdec N |
4333 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4334 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4335 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4336 | else |
58c0fed4 | 4337 | max_sectors = mddev->dev_sectors; |
88202a0c | 4338 | |
acb180b0 | 4339 | resync = mddev->curr_resync_completed; |
13ae864b | 4340 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4341 | } |
4342 | ||
750f199e N |
4343 | static struct md_sysfs_entry md_sync_completed = |
4344 | __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); | |
88202a0c | 4345 | |
5e96ee65 | 4346 | static ssize_t |
fd01b88c | 4347 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4348 | { |
4349 | return sprintf(page, "%llu\n", | |
4350 | (unsigned long long)mddev->resync_min); | |
4351 | } | |
4352 | static ssize_t | |
fd01b88c | 4353 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4354 | { |
4355 | unsigned long long min; | |
23da422b N |
4356 | int err; |
4357 | int chunk; | |
4358 | ||
b29bebd6 | 4359 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 | 4360 | return -EINVAL; |
23da422b N |
4361 | |
4362 | spin_lock(&mddev->lock); | |
4363 | err = -EINVAL; | |
5e96ee65 | 4364 | if (min > mddev->resync_max) |
23da422b N |
4365 | goto out_unlock; |
4366 | ||
4367 | err = -EBUSY; | |
5e96ee65 | 4368 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4369 | goto out_unlock; |
5e96ee65 NB |
4370 | |
4371 | /* Must be a multiple of chunk_size */ | |
23da422b N |
4372 | chunk = mddev->chunk_sectors; |
4373 | if (chunk) { | |
2ac06c33 | 4374 | sector_t temp = min; |
23da422b N |
4375 | |
4376 | err = -EINVAL; | |
4377 | if (sector_div(temp, chunk)) | |
4378 | goto out_unlock; | |
5e96ee65 NB |
4379 | } |
4380 | mddev->resync_min = min; | |
23da422b | 4381 | err = 0; |
5e96ee65 | 4382 | |
23da422b N |
4383 | out_unlock: |
4384 | spin_unlock(&mddev->lock); | |
4385 | return err ?: len; | |
5e96ee65 NB |
4386 | } |
4387 | ||
4388 | static struct md_sysfs_entry md_min_sync = | |
4389 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4390 | ||
c6207277 | 4391 | static ssize_t |
fd01b88c | 4392 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4393 | { |
4394 | if (mddev->resync_max == MaxSector) | |
4395 | return sprintf(page, "max\n"); | |
4396 | else | |
4397 | return sprintf(page, "%llu\n", | |
4398 | (unsigned long long)mddev->resync_max); | |
4399 | } | |
4400 | static ssize_t | |
fd01b88c | 4401 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 | 4402 | { |
23da422b N |
4403 | int err; |
4404 | spin_lock(&mddev->lock); | |
c6207277 N |
4405 | if (strncmp(buf, "max", 3) == 0) |
4406 | mddev->resync_max = MaxSector; | |
4407 | else { | |
5e96ee65 | 4408 | unsigned long long max; |
23da422b N |
4409 | int chunk; |
4410 | ||
4411 | err = -EINVAL; | |
b29bebd6 | 4412 | if (kstrtoull(buf, 10, &max)) |
23da422b | 4413 | goto out_unlock; |
5e96ee65 | 4414 | if (max < mddev->resync_min) |
23da422b N |
4415 | goto out_unlock; |
4416 | ||
4417 | err = -EBUSY; | |
c6207277 | 4418 | if (max < mddev->resync_max && |
4d484a4a | 4419 | mddev->ro == 0 && |
c6207277 | 4420 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4421 | goto out_unlock; |
c6207277 N |
4422 | |
4423 | /* Must be a multiple of chunk_size */ | |
23da422b N |
4424 | chunk = mddev->chunk_sectors; |
4425 | if (chunk) { | |
2ac06c33 | 4426 | sector_t temp = max; |
23da422b N |
4427 | |
4428 | err = -EINVAL; | |
4429 | if (sector_div(temp, chunk)) | |
4430 | goto out_unlock; | |
c6207277 N |
4431 | } |
4432 | mddev->resync_max = max; | |
4433 | } | |
4434 | wake_up(&mddev->recovery_wait); | |
23da422b N |
4435 | err = 0; |
4436 | out_unlock: | |
4437 | spin_unlock(&mddev->lock); | |
4438 | return err ?: len; | |
c6207277 N |
4439 | } |
4440 | ||
4441 | static struct md_sysfs_entry md_max_sync = | |
4442 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4443 | ||
e464eafd | 4444 | static ssize_t |
fd01b88c | 4445 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4446 | { |
4447 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4448 | } | |
4449 | ||
4450 | static ssize_t | |
fd01b88c | 4451 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4452 | { |
4453 | char *e; | |
4454 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
6791875e N |
4455 | unsigned long long old; |
4456 | int err; | |
e464eafd | 4457 | |
e464eafd N |
4458 | if (buf == e || (*e && *e != '\n')) |
4459 | return -EINVAL; | |
23ddff37 | 4460 | |
6791875e N |
4461 | err = mddev_lock(mddev); |
4462 | if (err) | |
4463 | return err; | |
4464 | err = -EINVAL; | |
4465 | if (mddev->pers == NULL || | |
4466 | mddev->pers->quiesce == NULL) | |
4467 | goto unlock; | |
4468 | old = mddev->suspend_lo; | |
23ddff37 N |
4469 | mddev->suspend_lo = new; |
4470 | if (new >= old) | |
4471 | /* Shrinking suspended region */ | |
e464eafd | 4472 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4473 | else { |
4474 | /* Expanding suspended region - need to wait */ | |
4475 | mddev->pers->quiesce(mddev, 1); | |
4476 | mddev->pers->quiesce(mddev, 0); | |
4477 | } | |
6791875e N |
4478 | err = 0; |
4479 | unlock: | |
4480 | mddev_unlock(mddev); | |
4481 | return err ?: len; | |
e464eafd N |
4482 | } |
4483 | static struct md_sysfs_entry md_suspend_lo = | |
4484 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4485 | ||
e464eafd | 4486 | static ssize_t |
fd01b88c | 4487 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4488 | { |
4489 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4490 | } | |
4491 | ||
4492 | static ssize_t | |
fd01b88c | 4493 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4494 | { |
4495 | char *e; | |
4496 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
6791875e N |
4497 | unsigned long long old; |
4498 | int err; | |
e464eafd | 4499 | |
e464eafd N |
4500 | if (buf == e || (*e && *e != '\n')) |
4501 | return -EINVAL; | |
23ddff37 | 4502 | |
6791875e N |
4503 | err = mddev_lock(mddev); |
4504 | if (err) | |
4505 | return err; | |
4506 | err = -EINVAL; | |
4507 | if (mddev->pers == NULL || | |
4508 | mddev->pers->quiesce == NULL) | |
4509 | goto unlock; | |
4510 | old = mddev->suspend_hi; | |
23ddff37 N |
4511 | mddev->suspend_hi = new; |
4512 | if (new <= old) | |
4513 | /* Shrinking suspended region */ | |
4514 | mddev->pers->quiesce(mddev, 2); | |
4515 | else { | |
4516 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4517 | mddev->pers->quiesce(mddev, 1); |
4518 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 | 4519 | } |
6791875e N |
4520 | err = 0; |
4521 | unlock: | |
4522 | mddev_unlock(mddev); | |
4523 | return err ?: len; | |
e464eafd N |
4524 | } |
4525 | static struct md_sysfs_entry md_suspend_hi = | |
4526 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4527 | ||
08a02ecd | 4528 | static ssize_t |
fd01b88c | 4529 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4530 | { |
4531 | if (mddev->reshape_position != MaxSector) | |
4532 | return sprintf(page, "%llu\n", | |
4533 | (unsigned long long)mddev->reshape_position); | |
4534 | strcpy(page, "none\n"); | |
4535 | return 5; | |
4536 | } | |
4537 | ||
4538 | static ssize_t | |
fd01b88c | 4539 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4540 | { |
c6563a8c | 4541 | struct md_rdev *rdev; |
08a02ecd | 4542 | char *e; |
6791875e | 4543 | int err; |
08a02ecd | 4544 | unsigned long long new = simple_strtoull(buf, &e, 10); |
6791875e | 4545 | |
08a02ecd N |
4546 | if (buf == e || (*e && *e != '\n')) |
4547 | return -EINVAL; | |
6791875e N |
4548 | err = mddev_lock(mddev); |
4549 | if (err) | |
4550 | return err; | |
4551 | err = -EBUSY; | |
4552 | if (mddev->pers) | |
4553 | goto unlock; | |
08a02ecd N |
4554 | mddev->reshape_position = new; |
4555 | mddev->delta_disks = 0; | |
2c810cdd | 4556 | mddev->reshape_backwards = 0; |
08a02ecd N |
4557 | mddev->new_level = mddev->level; |
4558 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4559 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4560 | rdev_for_each(rdev, mddev) |
4561 | rdev->new_data_offset = rdev->data_offset; | |
6791875e N |
4562 | err = 0; |
4563 | unlock: | |
4564 | mddev_unlock(mddev); | |
4565 | return err ?: len; | |
08a02ecd N |
4566 | } |
4567 | ||
4568 | static struct md_sysfs_entry md_reshape_position = | |
4569 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4570 | reshape_position_store); | |
4571 | ||
2c810cdd N |
4572 | static ssize_t |
4573 | reshape_direction_show(struct mddev *mddev, char *page) | |
4574 | { | |
4575 | return sprintf(page, "%s\n", | |
4576 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4577 | } | |
4578 | ||
4579 | static ssize_t | |
4580 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4581 | { | |
4582 | int backwards = 0; | |
6791875e N |
4583 | int err; |
4584 | ||
2c810cdd N |
4585 | if (cmd_match(buf, "forwards")) |
4586 | backwards = 0; | |
4587 | else if (cmd_match(buf, "backwards")) | |
4588 | backwards = 1; | |
4589 | else | |
4590 | return -EINVAL; | |
4591 | if (mddev->reshape_backwards == backwards) | |
4592 | return len; | |
4593 | ||
6791875e N |
4594 | err = mddev_lock(mddev); |
4595 | if (err) | |
4596 | return err; | |
2c810cdd N |
4597 | /* check if we are allowed to change */ |
4598 | if (mddev->delta_disks) | |
6791875e N |
4599 | err = -EBUSY; |
4600 | else if (mddev->persistent && | |
2c810cdd | 4601 | mddev->major_version == 0) |
6791875e N |
4602 | err = -EINVAL; |
4603 | else | |
4604 | mddev->reshape_backwards = backwards; | |
4605 | mddev_unlock(mddev); | |
4606 | return err ?: len; | |
2c810cdd N |
4607 | } |
4608 | ||
4609 | static struct md_sysfs_entry md_reshape_direction = | |
4610 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4611 | reshape_direction_store); | |
4612 | ||
b522adcd | 4613 | static ssize_t |
fd01b88c | 4614 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4615 | { |
4616 | if (mddev->external_size) | |
4617 | return sprintf(page, "%llu\n", | |
4618 | (unsigned long long)mddev->array_sectors/2); | |
4619 | else | |
4620 | return sprintf(page, "default\n"); | |
4621 | } | |
4622 | ||
4623 | static ssize_t | |
fd01b88c | 4624 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4625 | { |
4626 | sector_t sectors; | |
6791875e N |
4627 | int err; |
4628 | ||
4629 | err = mddev_lock(mddev); | |
4630 | if (err) | |
4631 | return err; | |
b522adcd DW |
4632 | |
4633 | if (strncmp(buf, "default", 7) == 0) { | |
4634 | if (mddev->pers) | |
4635 | sectors = mddev->pers->size(mddev, 0, 0); | |
4636 | else | |
4637 | sectors = mddev->array_sectors; | |
4638 | ||
4639 | mddev->external_size = 0; | |
4640 | } else { | |
4641 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
6791875e N |
4642 | err = -EINVAL; |
4643 | else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
4644 | err = -E2BIG; | |
4645 | else | |
4646 | mddev->external_size = 1; | |
b522adcd DW |
4647 | } |
4648 | ||
6791875e N |
4649 | if (!err) { |
4650 | mddev->array_sectors = sectors; | |
4651 | if (mddev->pers) { | |
4652 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
4653 | revalidate_disk(mddev->gendisk); | |
4654 | } | |
cbe6ef1d | 4655 | } |
6791875e N |
4656 | mddev_unlock(mddev); |
4657 | return err ?: len; | |
b522adcd DW |
4658 | } |
4659 | ||
4660 | static struct md_sysfs_entry md_array_size = | |
4661 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4662 | array_size_store); | |
e464eafd | 4663 | |
eae1701f N |
4664 | static struct attribute *md_default_attrs[] = { |
4665 | &md_level.attr, | |
d4dbd025 | 4666 | &md_layout.attr, |
eae1701f | 4667 | &md_raid_disks.attr, |
3b34380a | 4668 | &md_chunk_size.attr, |
a35b0d69 | 4669 | &md_size.attr, |
a94213b1 | 4670 | &md_resync_start.attr, |
8bb93aac | 4671 | &md_metadata.attr, |
6d7ff738 | 4672 | &md_new_device.attr, |
16f17b39 | 4673 | &md_safe_delay.attr, |
9e653b63 | 4674 | &md_array_state.attr, |
08a02ecd | 4675 | &md_reshape_position.attr, |
2c810cdd | 4676 | &md_reshape_direction.attr, |
b522adcd | 4677 | &md_array_size.attr, |
1e50915f | 4678 | &max_corr_read_errors.attr, |
411036fa N |
4679 | NULL, |
4680 | }; | |
4681 | ||
4682 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4683 | &md_scan_mode.attr, |
c4a39551 | 4684 | &md_last_scan_mode.attr, |
9d88883e | 4685 | &md_mismatches.attr, |
88202a0c N |
4686 | &md_sync_min.attr, |
4687 | &md_sync_max.attr, | |
4688 | &md_sync_speed.attr, | |
90b08710 | 4689 | &md_sync_force_parallel.attr, |
88202a0c | 4690 | &md_sync_completed.attr, |
5e96ee65 | 4691 | &md_min_sync.attr, |
c6207277 | 4692 | &md_max_sync.attr, |
e464eafd N |
4693 | &md_suspend_lo.attr, |
4694 | &md_suspend_hi.attr, | |
9b1d1dac | 4695 | &md_bitmap.attr, |
d7f3d291 | 4696 | &md_degraded.attr, |
eae1701f N |
4697 | NULL, |
4698 | }; | |
411036fa N |
4699 | static struct attribute_group md_redundancy_group = { |
4700 | .name = NULL, | |
4701 | .attrs = md_redundancy_attrs, | |
4702 | }; | |
4703 | ||
eae1701f N |
4704 | static ssize_t |
4705 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4706 | { | |
4707 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4708 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4709 | ssize_t rv; |
eae1701f N |
4710 | |
4711 | if (!entry->show) | |
4712 | return -EIO; | |
af8a2434 N |
4713 | spin_lock(&all_mddevs_lock); |
4714 | if (list_empty(&mddev->all_mddevs)) { | |
4715 | spin_unlock(&all_mddevs_lock); | |
4716 | return -EBUSY; | |
4717 | } | |
4718 | mddev_get(mddev); | |
4719 | spin_unlock(&all_mddevs_lock); | |
4720 | ||
b7b17c9b | 4721 | rv = entry->show(mddev, page); |
af8a2434 | 4722 | mddev_put(mddev); |
96de1e66 | 4723 | return rv; |
eae1701f N |
4724 | } |
4725 | ||
4726 | static ssize_t | |
4727 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4728 | const char *page, size_t length) | |
4729 | { | |
4730 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4731 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4732 | ssize_t rv; |
eae1701f N |
4733 | |
4734 | if (!entry->store) | |
4735 | return -EIO; | |
67463acb N |
4736 | if (!capable(CAP_SYS_ADMIN)) |
4737 | return -EACCES; | |
af8a2434 N |
4738 | spin_lock(&all_mddevs_lock); |
4739 | if (list_empty(&mddev->all_mddevs)) { | |
4740 | spin_unlock(&all_mddevs_lock); | |
4741 | return -EBUSY; | |
4742 | } | |
4743 | mddev_get(mddev); | |
4744 | spin_unlock(&all_mddevs_lock); | |
6791875e | 4745 | rv = entry->store(mddev, page, length); |
af8a2434 | 4746 | mddev_put(mddev); |
96de1e66 | 4747 | return rv; |
eae1701f N |
4748 | } |
4749 | ||
4750 | static void md_free(struct kobject *ko) | |
4751 | { | |
fd01b88c | 4752 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4753 | |
4754 | if (mddev->sysfs_state) | |
4755 | sysfs_put(mddev->sysfs_state); | |
4756 | ||
4757 | if (mddev->gendisk) { | |
4758 | del_gendisk(mddev->gendisk); | |
4759 | put_disk(mddev->gendisk); | |
4760 | } | |
4761 | if (mddev->queue) | |
4762 | blk_cleanup_queue(mddev->queue); | |
4763 | ||
eae1701f N |
4764 | kfree(mddev); |
4765 | } | |
4766 | ||
52cf25d0 | 4767 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4768 | .show = md_attr_show, |
4769 | .store = md_attr_store, | |
4770 | }; | |
4771 | static struct kobj_type md_ktype = { | |
4772 | .release = md_free, | |
4773 | .sysfs_ops = &md_sysfs_ops, | |
4774 | .default_attrs = md_default_attrs, | |
4775 | }; | |
4776 | ||
1da177e4 LT |
4777 | int mdp_major = 0; |
4778 | ||
5fd3a17e DW |
4779 | static void mddev_delayed_delete(struct work_struct *ws) |
4780 | { | |
fd01b88c | 4781 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4782 | |
43a70507 | 4783 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4784 | kobject_del(&mddev->kobj); |
4785 | kobject_put(&mddev->kobj); | |
4786 | } | |
4787 | ||
efeb53c0 | 4788 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4789 | { |
48c9c27b | 4790 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4791 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4792 | struct gendisk *disk; |
efeb53c0 N |
4793 | int partitioned; |
4794 | int shift; | |
4795 | int unit; | |
3830c62f | 4796 | int error; |
1da177e4 LT |
4797 | |
4798 | if (!mddev) | |
efeb53c0 N |
4799 | return -ENODEV; |
4800 | ||
4801 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4802 | shift = partitioned ? MdpMinorShift : 0; | |
4803 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4804 | |
e804ac78 TH |
4805 | /* wait for any previous instance of this device to be |
4806 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4807 | */ |
e804ac78 | 4808 | flush_workqueue(md_misc_wq); |
d3374825 | 4809 | |
48c9c27b | 4810 | mutex_lock(&disks_mutex); |
0909dc44 N |
4811 | error = -EEXIST; |
4812 | if (mddev->gendisk) | |
4813 | goto abort; | |
efeb53c0 N |
4814 | |
4815 | if (name) { | |
4816 | /* Need to ensure that 'name' is not a duplicate. | |
4817 | */ | |
fd01b88c | 4818 | struct mddev *mddev2; |
efeb53c0 N |
4819 | spin_lock(&all_mddevs_lock); |
4820 | ||
4821 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4822 | if (mddev2->gendisk && | |
4823 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4824 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4825 | goto abort; |
efeb53c0 N |
4826 | } |
4827 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4828 | } |
8b765398 | 4829 | |
0909dc44 | 4830 | error = -ENOMEM; |
8b765398 | 4831 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4832 | if (!mddev->queue) |
4833 | goto abort; | |
409c57f3 N |
4834 | mddev->queue->queuedata = mddev; |
4835 | ||
409c57f3 | 4836 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 4837 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 4838 | |
1da177e4 LT |
4839 | disk = alloc_disk(1 << shift); |
4840 | if (!disk) { | |
8b765398 N |
4841 | blk_cleanup_queue(mddev->queue); |
4842 | mddev->queue = NULL; | |
0909dc44 | 4843 | goto abort; |
1da177e4 | 4844 | } |
efeb53c0 | 4845 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4846 | disk->first_minor = unit << shift; |
efeb53c0 N |
4847 | if (name) |
4848 | strcpy(disk->disk_name, name); | |
4849 | else if (partitioned) | |
1da177e4 | 4850 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4851 | else |
1da177e4 | 4852 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4853 | disk->fops = &md_fops; |
4854 | disk->private_data = mddev; | |
4855 | disk->queue = mddev->queue; | |
b0140891 | 4856 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4857 | /* Allow extended partitions. This makes the |
d3374825 | 4858 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4859 | * remove it now. |
4860 | */ | |
4861 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4862 | mddev->gendisk = disk; |
b0140891 N |
4863 | /* As soon as we call add_disk(), another thread could get |
4864 | * through to md_open, so make sure it doesn't get too far | |
4865 | */ | |
4866 | mutex_lock(&mddev->open_mutex); | |
4867 | add_disk(disk); | |
4868 | ||
ed9e1982 TH |
4869 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4870 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4871 | if (error) { |
4872 | /* This isn't possible, but as kobject_init_and_add is marked | |
4873 | * __must_check, we must do something with the result | |
4874 | */ | |
5e55e2f5 N |
4875 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4876 | disk->disk_name); | |
0909dc44 N |
4877 | error = 0; |
4878 | } | |
00bcb4ac N |
4879 | if (mddev->kobj.sd && |
4880 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4881 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4882 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4883 | abort: |
4884 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4885 | if (!error && mddev->kobj.sd) { |
3830c62f | 4886 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4887 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4888 | } |
d3374825 | 4889 | mddev_put(mddev); |
0909dc44 | 4890 | return error; |
efeb53c0 N |
4891 | } |
4892 | ||
4893 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4894 | { | |
4895 | md_alloc(dev, NULL); | |
1da177e4 LT |
4896 | return NULL; |
4897 | } | |
4898 | ||
efeb53c0 N |
4899 | static int add_named_array(const char *val, struct kernel_param *kp) |
4900 | { | |
4901 | /* val must be "md_*" where * is not all digits. | |
4902 | * We allocate an array with a large free minor number, and | |
4903 | * set the name to val. val must not already be an active name. | |
4904 | */ | |
4905 | int len = strlen(val); | |
4906 | char buf[DISK_NAME_LEN]; | |
4907 | ||
4908 | while (len && val[len-1] == '\n') | |
4909 | len--; | |
4910 | if (len >= DISK_NAME_LEN) | |
4911 | return -E2BIG; | |
4912 | strlcpy(buf, val, len+1); | |
4913 | if (strncmp(buf, "md_", 3) != 0) | |
4914 | return -EINVAL; | |
4915 | return md_alloc(0, buf); | |
4916 | } | |
4917 | ||
1da177e4 LT |
4918 | static void md_safemode_timeout(unsigned long data) |
4919 | { | |
fd01b88c | 4920 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 4921 | |
0fd62b86 NB |
4922 | if (!atomic_read(&mddev->writes_pending)) { |
4923 | mddev->safemode = 1; | |
4924 | if (mddev->external) | |
00bcb4ac | 4925 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4926 | } |
1da177e4 LT |
4927 | md_wakeup_thread(mddev->thread); |
4928 | } | |
4929 | ||
6ff8d8ec | 4930 | static int start_dirty_degraded; |
1da177e4 | 4931 | |
fd01b88c | 4932 | int md_run(struct mddev *mddev) |
1da177e4 | 4933 | { |
2604b703 | 4934 | int err; |
3cb03002 | 4935 | struct md_rdev *rdev; |
84fc4b56 | 4936 | struct md_personality *pers; |
1da177e4 | 4937 | |
a757e64c N |
4938 | if (list_empty(&mddev->disks)) |
4939 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4940 | return -EINVAL; |
1da177e4 LT |
4941 | |
4942 | if (mddev->pers) | |
4943 | return -EBUSY; | |
bb4f1e9d N |
4944 | /* Cannot run until previous stop completes properly */ |
4945 | if (mddev->sysfs_active) | |
4946 | return -EBUSY; | |
b6eb127d | 4947 | |
1da177e4 LT |
4948 | /* |
4949 | * Analyze all RAID superblock(s) | |
4950 | */ | |
1ec4a939 N |
4951 | if (!mddev->raid_disks) { |
4952 | if (!mddev->persistent) | |
4953 | return -EINVAL; | |
a757e64c | 4954 | analyze_sbs(mddev); |
1ec4a939 | 4955 | } |
1da177e4 | 4956 | |
d9d166c2 N |
4957 | if (mddev->level != LEVEL_NONE) |
4958 | request_module("md-level-%d", mddev->level); | |
4959 | else if (mddev->clevel[0]) | |
4960 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4961 | |
4962 | /* | |
4963 | * Drop all container device buffers, from now on | |
4964 | * the only valid external interface is through the md | |
4965 | * device. | |
1da177e4 | 4966 | */ |
dafb20fa | 4967 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 4968 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4969 | continue; |
4970 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4971 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4972 | |
4973 | /* perform some consistency tests on the device. | |
4974 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4975 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4976 | */ |
a6ff7e08 JB |
4977 | if (rdev->meta_bdev) { |
4978 | /* Nothing to check */; | |
4979 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4980 | if (mddev->dev_sectors && |
4981 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4982 | > rdev->sb_start) { |
f0d76d70 N |
4983 | printk("md: %s: data overlaps metadata\n", |
4984 | mdname(mddev)); | |
4985 | return -EINVAL; | |
4986 | } | |
4987 | } else { | |
0f420358 | 4988 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4989 | > rdev->data_offset) { |
4990 | printk("md: %s: metadata overlaps data\n", | |
4991 | mdname(mddev)); | |
4992 | return -EINVAL; | |
4993 | } | |
4994 | } | |
00bcb4ac | 4995 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4996 | } |
4997 | ||
a167f663 | 4998 | if (mddev->bio_set == NULL) |
395c72a7 | 4999 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 5000 | |
1da177e4 | 5001 | spin_lock(&pers_lock); |
d9d166c2 | 5002 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 5003 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 5004 | spin_unlock(&pers_lock); |
d9d166c2 N |
5005 | if (mddev->level != LEVEL_NONE) |
5006 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
5007 | mddev->level); | |
5008 | else | |
5009 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
5010 | mddev->clevel); | |
1da177e4 LT |
5011 | return -EINVAL; |
5012 | } | |
1da177e4 | 5013 | spin_unlock(&pers_lock); |
34817e8c N |
5014 | if (mddev->level != pers->level) { |
5015 | mddev->level = pers->level; | |
5016 | mddev->new_level = pers->level; | |
5017 | } | |
d9d166c2 | 5018 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 5019 | |
f6705578 | 5020 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 5021 | pers->start_reshape == NULL) { |
f6705578 | 5022 | /* This personality cannot handle reshaping... */ |
f6705578 N |
5023 | module_put(pers->owner); |
5024 | return -EINVAL; | |
5025 | } | |
5026 | ||
7dd5e7c3 N |
5027 | if (pers->sync_request) { |
5028 | /* Warn if this is a potentially silly | |
5029 | * configuration. | |
5030 | */ | |
5031 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5032 | struct md_rdev *rdev2; |
7dd5e7c3 | 5033 | int warned = 0; |
159ec1fc | 5034 | |
dafb20fa N |
5035 | rdev_for_each(rdev, mddev) |
5036 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
5037 | if (rdev < rdev2 && |
5038 | rdev->bdev->bd_contains == | |
5039 | rdev2->bdev->bd_contains) { | |
5040 | printk(KERN_WARNING | |
5041 | "%s: WARNING: %s appears to be" | |
5042 | " on the same physical disk as" | |
5043 | " %s.\n", | |
5044 | mdname(mddev), | |
5045 | bdevname(rdev->bdev,b), | |
5046 | bdevname(rdev2->bdev,b2)); | |
5047 | warned = 1; | |
5048 | } | |
5049 | } | |
159ec1fc | 5050 | |
7dd5e7c3 N |
5051 | if (warned) |
5052 | printk(KERN_WARNING | |
5053 | "True protection against single-disk" | |
5054 | " failure might be compromised.\n"); | |
5055 | } | |
5056 | ||
657390d2 | 5057 | mddev->recovery = 0; |
58c0fed4 AN |
5058 | /* may be over-ridden by personality */ |
5059 | mddev->resync_max_sectors = mddev->dev_sectors; | |
5060 | ||
6ff8d8ec | 5061 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 5062 | |
0f9552b5 | 5063 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
5064 | mddev->ro = 2; /* read-only, but switch on first write */ |
5065 | ||
36d091f4 | 5066 | err = pers->run(mddev); |
13e53df3 AN |
5067 | if (err) |
5068 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
36d091f4 | 5069 | else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { |
b522adcd DW |
5070 | WARN_ONCE(!mddev->external_size, "%s: default size too small," |
5071 | " but 'external_size' not in effect?\n", __func__); | |
5072 | printk(KERN_ERR | |
5073 | "md: invalid array_size %llu > default size %llu\n", | |
5074 | (unsigned long long)mddev->array_sectors / 2, | |
36d091f4 | 5075 | (unsigned long long)pers->size(mddev, 0, 0) / 2); |
b522adcd | 5076 | err = -EINVAL; |
b522adcd | 5077 | } |
36d091f4 | 5078 | if (err == 0 && pers->sync_request && |
ef99bf48 | 5079 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { |
b15c2e57 | 5080 | err = bitmap_create(mddev); |
5aa61f42 | 5081 | if (err) |
b15c2e57 N |
5082 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", |
5083 | mdname(mddev), err); | |
b15c2e57 | 5084 | } |
1da177e4 | 5085 | if (err) { |
5aa61f42 | 5086 | mddev_detach(mddev); |
0c35bd47 N |
5087 | if (mddev->private) |
5088 | pers->free(mddev, mddev->private); | |
36d091f4 | 5089 | module_put(pers->owner); |
32a7627c N |
5090 | bitmap_destroy(mddev); |
5091 | return err; | |
1da177e4 | 5092 | } |
5c675f83 N |
5093 | if (mddev->queue) { |
5094 | mddev->queue->backing_dev_info.congested_data = mddev; | |
5095 | mddev->queue->backing_dev_info.congested_fn = md_congested; | |
64590f45 | 5096 | blk_queue_merge_bvec(mddev->queue, md_mergeable_bvec); |
5c675f83 | 5097 | } |
36d091f4 | 5098 | if (pers->sync_request) { |
00bcb4ac N |
5099 | if (mddev->kobj.sd && |
5100 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
5101 | printk(KERN_WARNING |
5102 | "md: cannot register extra attributes for %s\n", | |
5103 | mdname(mddev)); | |
00bcb4ac | 5104 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 5105 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
5106 | mddev->ro = 0; |
5107 | ||
f72ffdd6 | 5108 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
5109 | atomic_set(&mddev->max_corr_read_errors, |
5110 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
5111 | mddev->safemode = 0; |
5112 | mddev->safemode_timer.function = md_safemode_timeout; | |
5113 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 5114 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 5115 | mddev->in_sync = 1; |
0ca69886 | 5116 | smp_wmb(); |
36d091f4 N |
5117 | spin_lock(&mddev->lock); |
5118 | mddev->pers = pers; | |
0ca69886 | 5119 | mddev->ready = 1; |
36d091f4 | 5120 | spin_unlock(&mddev->lock); |
dafb20fa | 5121 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5122 | if (rdev->raid_disk >= 0) |
5123 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 5124 | /* failure here is OK */; |
f72ffdd6 | 5125 | |
1da177e4 | 5126 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 5127 | |
7a0a5355 | 5128 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 5129 | md_update_sb(mddev, 0); |
1da177e4 | 5130 | |
d7603b7e | 5131 | md_new_event(mddev); |
00bcb4ac N |
5132 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
5133 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 5134 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
5135 | return 0; |
5136 | } | |
390ee602 | 5137 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 5138 | |
fd01b88c | 5139 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
5140 | { |
5141 | int err; | |
5142 | ||
5143 | err = md_run(mddev); | |
5144 | if (err) | |
5145 | goto out; | |
69e51b44 N |
5146 | err = bitmap_load(mddev); |
5147 | if (err) { | |
5148 | bitmap_destroy(mddev); | |
5149 | goto out; | |
5150 | } | |
0fd018af JB |
5151 | |
5152 | md_wakeup_thread(mddev->thread); | |
5153 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5154 | ||
fe60b014 N |
5155 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5156 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5157 | mddev->changed = 1; |
fe60b014 N |
5158 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5159 | out: | |
5160 | return err; | |
5161 | } | |
5162 | ||
fd01b88c | 5163 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5164 | { |
5165 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5166 | |
80fab1d7 | 5167 | /* Complain if it has no devices */ |
1da177e4 | 5168 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5169 | return -ENXIO; |
5170 | if (!mddev->pers) | |
5171 | return -EINVAL; | |
5172 | if (!mddev->ro) | |
5173 | return -EBUSY; | |
5174 | mddev->safemode = 0; | |
5175 | mddev->ro = 0; | |
5176 | set_disk_ro(disk, 0); | |
5177 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5178 | mdname(mddev)); | |
5179 | /* Kick recovery or resync if necessary */ | |
5180 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5181 | md_wakeup_thread(mddev->thread); | |
5182 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5183 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5184 | return 0; |
1da177e4 LT |
5185 | } |
5186 | ||
fd01b88c | 5187 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5188 | { |
5189 | mddev->array_sectors = 0; | |
5190 | mddev->external_size = 0; | |
5191 | mddev->dev_sectors = 0; | |
5192 | mddev->raid_disks = 0; | |
5193 | mddev->recovery_cp = 0; | |
5194 | mddev->resync_min = 0; | |
5195 | mddev->resync_max = MaxSector; | |
5196 | mddev->reshape_position = MaxSector; | |
5197 | mddev->external = 0; | |
5198 | mddev->persistent = 0; | |
5199 | mddev->level = LEVEL_NONE; | |
5200 | mddev->clevel[0] = 0; | |
5201 | mddev->flags = 0; | |
5202 | mddev->ro = 0; | |
5203 | mddev->metadata_type[0] = 0; | |
5204 | mddev->chunk_sectors = 0; | |
5205 | mddev->ctime = mddev->utime = 0; | |
5206 | mddev->layout = 0; | |
5207 | mddev->max_disks = 0; | |
5208 | mddev->events = 0; | |
a8707c08 | 5209 | mddev->can_decrease_events = 0; |
6177b472 | 5210 | mddev->delta_disks = 0; |
2c810cdd | 5211 | mddev->reshape_backwards = 0; |
6177b472 N |
5212 | mddev->new_level = LEVEL_NONE; |
5213 | mddev->new_layout = 0; | |
5214 | mddev->new_chunk_sectors = 0; | |
5215 | mddev->curr_resync = 0; | |
7f7583d4 | 5216 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5217 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5218 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5219 | mddev->recovery = 0; | |
5220 | mddev->in_sync = 0; | |
f0b4f7e2 | 5221 | mddev->changed = 0; |
6177b472 | 5222 | mddev->degraded = 0; |
6177b472 | 5223 | mddev->safemode = 0; |
050b6615 | 5224 | mddev->merge_check_needed = 0; |
6177b472 N |
5225 | mddev->bitmap_info.offset = 0; |
5226 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5227 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5228 | mddev->bitmap_info.chunksize = 0; |
5229 | mddev->bitmap_info.daemon_sleep = 0; | |
5230 | mddev->bitmap_info.max_write_behind = 0; | |
5231 | } | |
5232 | ||
fd01b88c | 5233 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5234 | { |
6b6204ee | 5235 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5236 | flush_workqueue(md_misc_wq); |
a047e125 | 5237 | if (mddev->sync_thread) { |
a047e125 | 5238 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5239 | md_reap_sync_thread(mddev); |
a047e125 N |
5240 | } |
5241 | ||
5242 | del_timer_sync(&mddev->safemode_timer); | |
5243 | ||
5244 | bitmap_flush(mddev); | |
5245 | md_super_wait(mddev); | |
5246 | ||
b6d428c6 | 5247 | if (mddev->ro == 0 && |
7a0a5355 | 5248 | (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) { |
a047e125 N |
5249 | /* mark array as shutdown cleanly */ |
5250 | mddev->in_sync = 1; | |
5251 | md_update_sb(mddev, 1); | |
5252 | } | |
5253 | } | |
defad61a | 5254 | |
fd01b88c | 5255 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5256 | { |
29f097c4 | 5257 | mddev_lock_nointr(mddev); |
defad61a N |
5258 | __md_stop_writes(mddev); |
5259 | mddev_unlock(mddev); | |
5260 | } | |
390ee602 | 5261 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5262 | |
5aa61f42 N |
5263 | static void mddev_detach(struct mddev *mddev) |
5264 | { | |
5265 | struct bitmap *bitmap = mddev->bitmap; | |
5266 | /* wait for behind writes to complete */ | |
5267 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
5268 | printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n", | |
5269 | mdname(mddev)); | |
5270 | /* need to kick something here to make sure I/O goes? */ | |
5271 | wait_event(bitmap->behind_wait, | |
5272 | atomic_read(&bitmap->behind_writes) == 0); | |
5273 | } | |
36d091f4 | 5274 | if (mddev->pers && mddev->pers->quiesce) { |
5aa61f42 N |
5275 | mddev->pers->quiesce(mddev, 1); |
5276 | mddev->pers->quiesce(mddev, 0); | |
5277 | } | |
5278 | md_unregister_thread(&mddev->thread); | |
5279 | if (mddev->queue) | |
5280 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
5281 | } | |
5282 | ||
5eff3c43 | 5283 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5284 | { |
36d091f4 | 5285 | struct md_personality *pers = mddev->pers; |
5aa61f42 | 5286 | mddev_detach(mddev); |
36d091f4 N |
5287 | spin_lock(&mddev->lock); |
5288 | mddev->ready = 0; | |
6177b472 | 5289 | mddev->pers = NULL; |
36d091f4 N |
5290 | spin_unlock(&mddev->lock); |
5291 | pers->free(mddev, mddev->private); | |
5292 | if (pers->sync_request && mddev->to_remove == NULL) | |
5293 | mddev->to_remove = &md_redundancy_group; | |
5294 | module_put(pers->owner); | |
cca9cf90 | 5295 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5296 | } |
5eff3c43 N |
5297 | |
5298 | void md_stop(struct mddev *mddev) | |
5299 | { | |
5300 | /* stop the array and free an attached data structures. | |
5301 | * This is called from dm-raid | |
5302 | */ | |
5303 | __md_stop(mddev); | |
5304 | bitmap_destroy(mddev); | |
5305 | if (mddev->bio_set) | |
5306 | bioset_free(mddev->bio_set); | |
5307 | } | |
5308 | ||
390ee602 | 5309 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5310 | |
a05b7ea0 | 5311 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5312 | { |
5313 | int err = 0; | |
30b8feb7 N |
5314 | int did_freeze = 0; |
5315 | ||
5316 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5317 | did_freeze = 1; | |
5318 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5319 | md_wakeup_thread(mddev->thread); | |
5320 | } | |
f851b60d | 5321 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5322 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5323 | if (mddev->sync_thread) |
30b8feb7 N |
5324 | /* Thread might be blocked waiting for metadata update |
5325 | * which will now never happen */ | |
5326 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5327 | |
30b8feb7 | 5328 | mddev_unlock(mddev); |
f851b60d N |
5329 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5330 | &mddev->recovery)); | |
30b8feb7 N |
5331 | mddev_lock_nointr(mddev); |
5332 | ||
a4bd82d0 | 5333 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5334 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5335 | mddev->sync_thread || |
f851b60d | 5336 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5337 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
a4bd82d0 | 5338 | printk("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5339 | if (did_freeze) { |
5340 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5341 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5342 | md_wakeup_thread(mddev->thread); |
5343 | } | |
a4bd82d0 N |
5344 | err = -EBUSY; |
5345 | goto out; | |
5346 | } | |
5347 | if (mddev->pers) { | |
defad61a | 5348 | __md_stop_writes(mddev); |
a4bd82d0 N |
5349 | |
5350 | err = -ENXIO; | |
5351 | if (mddev->ro==1) | |
5352 | goto out; | |
5353 | mddev->ro = 1; | |
5354 | set_disk_ro(mddev->gendisk, 1); | |
5355 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5356 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5357 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5358 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5359 | err = 0; |
a4bd82d0 N |
5360 | } |
5361 | out: | |
5362 | mutex_unlock(&mddev->open_mutex); | |
5363 | return err; | |
5364 | } | |
5365 | ||
9e653b63 N |
5366 | /* mode: |
5367 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5368 | * 2 - stop but do not disassemble array |
5369 | */ | |
f72ffdd6 | 5370 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5371 | struct block_device *bdev) |
1da177e4 | 5372 | { |
1da177e4 | 5373 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5374 | struct md_rdev *rdev; |
30b8feb7 N |
5375 | int did_freeze = 0; |
5376 | ||
5377 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5378 | did_freeze = 1; | |
5379 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5380 | md_wakeup_thread(mddev->thread); | |
5381 | } | |
f851b60d | 5382 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5383 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5384 | if (mddev->sync_thread) |
30b8feb7 N |
5385 | /* Thread might be blocked waiting for metadata update |
5386 | * which will now never happen */ | |
5387 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5388 | |
30b8feb7 | 5389 | mddev_unlock(mddev); |
f851b60d N |
5390 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5391 | !test_bit(MD_RECOVERY_RUNNING, | |
5392 | &mddev->recovery))); | |
30b8feb7 | 5393 | mddev_lock_nointr(mddev); |
1da177e4 | 5394 | |
c8c00a69 | 5395 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5396 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5397 | mddev->sysfs_active || |
5398 | mddev->sync_thread || | |
f851b60d | 5399 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5400 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
df5b20cf | 5401 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5402 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5403 | if (did_freeze) { |
5404 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5405 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5406 | md_wakeup_thread(mddev->thread); |
5407 | } | |
260fa034 N |
5408 | return -EBUSY; |
5409 | } | |
6e17b027 | 5410 | if (mddev->pers) { |
a4bd82d0 N |
5411 | if (mddev->ro) |
5412 | set_disk_ro(disk, 0); | |
409c57f3 | 5413 | |
defad61a | 5414 | __md_stop_writes(mddev); |
5eff3c43 | 5415 | __md_stop(mddev); |
a4bd82d0 | 5416 | mddev->queue->merge_bvec_fn = NULL; |
a4bd82d0 | 5417 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5418 | |
a4bd82d0 | 5419 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5420 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5421 | |
dafb20fa | 5422 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5423 | if (rdev->raid_disk >= 0) |
5424 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5425 | |
a4bd82d0 | 5426 | set_capacity(disk, 0); |
6e17b027 | 5427 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5428 | mddev->changed = 1; |
a4bd82d0 | 5429 | revalidate_disk(disk); |
0d4ca600 | 5430 | |
a4bd82d0 N |
5431 | if (mddev->ro) |
5432 | mddev->ro = 0; | |
6e17b027 N |
5433 | } else |
5434 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5435 | /* |
5436 | * Free resources if final stop | |
5437 | */ | |
9e653b63 | 5438 | if (mode == 0) { |
1da177e4 LT |
5439 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5440 | ||
978f946b | 5441 | bitmap_destroy(mddev); |
c3d9714e | 5442 | if (mddev->bitmap_info.file) { |
4af1a041 N |
5443 | struct file *f = mddev->bitmap_info.file; |
5444 | spin_lock(&mddev->lock); | |
c3d9714e | 5445 | mddev->bitmap_info.file = NULL; |
4af1a041 N |
5446 | spin_unlock(&mddev->lock); |
5447 | fput(f); | |
978f946b | 5448 | } |
c3d9714e | 5449 | mddev->bitmap_info.offset = 0; |
978f946b | 5450 | |
1da177e4 LT |
5451 | export_array(mddev); |
5452 | ||
6177b472 | 5453 | md_clean(mddev); |
934d9c23 | 5454 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5455 | if (mddev->hold_active == UNTIL_STOP) |
5456 | mddev->hold_active = 0; | |
a4bd82d0 | 5457 | } |
3f9d99c1 | 5458 | blk_integrity_unregister(disk); |
d7603b7e | 5459 | md_new_event(mddev); |
00bcb4ac | 5460 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5461 | return 0; |
1da177e4 LT |
5462 | } |
5463 | ||
fdee8ae4 | 5464 | #ifndef MODULE |
fd01b88c | 5465 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5466 | { |
3cb03002 | 5467 | struct md_rdev *rdev; |
1da177e4 LT |
5468 | int err; |
5469 | ||
a757e64c | 5470 | if (list_empty(&mddev->disks)) |
1da177e4 | 5471 | return; |
1da177e4 LT |
5472 | |
5473 | printk(KERN_INFO "md: running: "); | |
5474 | ||
dafb20fa | 5475 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5476 | char b[BDEVNAME_SIZE]; |
5477 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5478 | } | |
5479 | printk("\n"); | |
5480 | ||
d710e138 | 5481 | err = do_md_run(mddev); |
1da177e4 LT |
5482 | if (err) { |
5483 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5484 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5485 | } |
5486 | } | |
5487 | ||
5488 | /* | |
5489 | * lets try to run arrays based on all disks that have arrived | |
5490 | * until now. (those are in pending_raid_disks) | |
5491 | * | |
5492 | * the method: pick the first pending disk, collect all disks with | |
5493 | * the same UUID, remove all from the pending list and put them into | |
5494 | * the 'same_array' list. Then order this list based on superblock | |
5495 | * update time (freshest comes first), kick out 'old' disks and | |
5496 | * compare superblocks. If everything's fine then run it. | |
5497 | * | |
5498 | * If "unit" is allocated, then bump its reference count | |
5499 | */ | |
5500 | static void autorun_devices(int part) | |
5501 | { | |
3cb03002 | 5502 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5503 | struct mddev *mddev; |
1da177e4 LT |
5504 | char b[BDEVNAME_SIZE]; |
5505 | ||
5506 | printk(KERN_INFO "md: autorun ...\n"); | |
5507 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5508 | int unit; |
1da177e4 | 5509 | dev_t dev; |
ad01c9e3 | 5510 | LIST_HEAD(candidates); |
1da177e4 | 5511 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5512 | struct md_rdev, same_set); |
1da177e4 LT |
5513 | |
5514 | printk(KERN_INFO "md: considering %s ...\n", | |
5515 | bdevname(rdev0->bdev,b)); | |
5516 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5517 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5518 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5519 | printk(KERN_INFO "md: adding %s ...\n", | |
5520 | bdevname(rdev->bdev,b)); | |
5521 | list_move(&rdev->same_set, &candidates); | |
5522 | } | |
5523 | /* | |
5524 | * now we have a set of devices, with all of them having | |
5525 | * mostly sane superblocks. It's time to allocate the | |
5526 | * mddev. | |
5527 | */ | |
e8703fe1 N |
5528 | if (part) { |
5529 | dev = MKDEV(mdp_major, | |
5530 | rdev0->preferred_minor << MdpMinorShift); | |
5531 | unit = MINOR(dev) >> MdpMinorShift; | |
5532 | } else { | |
5533 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5534 | unit = MINOR(dev); | |
5535 | } | |
5536 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5537 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5538 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5539 | break; | |
5540 | } | |
1da177e4 LT |
5541 | |
5542 | md_probe(dev, NULL, NULL); | |
5543 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5544 | if (!mddev || !mddev->gendisk) { |
5545 | if (mddev) | |
5546 | mddev_put(mddev); | |
5547 | printk(KERN_ERR | |
1da177e4 LT |
5548 | "md: cannot allocate memory for md drive.\n"); |
5549 | break; | |
5550 | } | |
f72ffdd6 | 5551 | if (mddev_lock(mddev)) |
1da177e4 LT |
5552 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
5553 | mdname(mddev)); | |
5554 | else if (mddev->raid_disks || mddev->major_version | |
5555 | || !list_empty(&mddev->disks)) { | |
f72ffdd6 | 5556 | printk(KERN_WARNING |
1da177e4 LT |
5557 | "md: %s already running, cannot run %s\n", |
5558 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5559 | mddev_unlock(mddev); | |
5560 | } else { | |
5561 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5562 | mddev->persistent = 1; |
159ec1fc | 5563 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5564 | list_del_init(&rdev->same_set); |
5565 | if (bind_rdev_to_array(rdev, mddev)) | |
5566 | export_rdev(rdev); | |
5567 | } | |
5568 | autorun_array(mddev); | |
5569 | mddev_unlock(mddev); | |
5570 | } | |
5571 | /* on success, candidates will be empty, on error | |
5572 | * it won't... | |
5573 | */ | |
159ec1fc | 5574 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5575 | list_del_init(&rdev->same_set); |
1da177e4 | 5576 | export_rdev(rdev); |
4b80991c | 5577 | } |
1da177e4 LT |
5578 | mddev_put(mddev); |
5579 | } | |
5580 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5581 | } | |
fdee8ae4 | 5582 | #endif /* !MODULE */ |
1da177e4 | 5583 | |
f72ffdd6 | 5584 | static int get_version(void __user *arg) |
1da177e4 LT |
5585 | { |
5586 | mdu_version_t ver; | |
5587 | ||
5588 | ver.major = MD_MAJOR_VERSION; | |
5589 | ver.minor = MD_MINOR_VERSION; | |
5590 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5591 | ||
5592 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5593 | return -EFAULT; | |
5594 | ||
5595 | return 0; | |
5596 | } | |
5597 | ||
f72ffdd6 | 5598 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
5599 | { |
5600 | mdu_array_info_t info; | |
a9f326eb | 5601 | int nr,working,insync,failed,spare; |
3cb03002 | 5602 | struct md_rdev *rdev; |
1da177e4 | 5603 | |
1ca69c4b N |
5604 | nr = working = insync = failed = spare = 0; |
5605 | rcu_read_lock(); | |
5606 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5607 | nr++; |
b2d444d7 | 5608 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5609 | failed++; |
5610 | else { | |
5611 | working++; | |
b2d444d7 | 5612 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 5613 | insync++; |
1da177e4 LT |
5614 | else |
5615 | spare++; | |
5616 | } | |
5617 | } | |
1ca69c4b | 5618 | rcu_read_unlock(); |
1da177e4 LT |
5619 | |
5620 | info.major_version = mddev->major_version; | |
5621 | info.minor_version = mddev->minor_version; | |
5622 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5623 | info.ctime = mddev->ctime; | |
5624 | info.level = mddev->level; | |
58c0fed4 AN |
5625 | info.size = mddev->dev_sectors / 2; |
5626 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5627 | info.size = -1; |
1da177e4 LT |
5628 | info.nr_disks = nr; |
5629 | info.raid_disks = mddev->raid_disks; | |
5630 | info.md_minor = mddev->md_minor; | |
5631 | info.not_persistent= !mddev->persistent; | |
5632 | ||
5633 | info.utime = mddev->utime; | |
5634 | info.state = 0; | |
5635 | if (mddev->in_sync) | |
5636 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5637 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 5638 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5639 | info.active_disks = insync; |
1da177e4 LT |
5640 | info.working_disks = working; |
5641 | info.failed_disks = failed; | |
5642 | info.spare_disks = spare; | |
5643 | ||
5644 | info.layout = mddev->layout; | |
9d8f0363 | 5645 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5646 | |
5647 | if (copy_to_user(arg, &info, sizeof(info))) | |
5648 | return -EFAULT; | |
5649 | ||
5650 | return 0; | |
5651 | } | |
5652 | ||
f72ffdd6 | 5653 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
5654 | { |
5655 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
f4ad3d38 | 5656 | char *ptr; |
4af1a041 | 5657 | int err; |
32a7627c | 5658 | |
60559da4 | 5659 | file = kmalloc(sizeof(*file), GFP_NOIO); |
32a7627c | 5660 | if (!file) |
4af1a041 | 5661 | return -ENOMEM; |
32a7627c | 5662 | |
4af1a041 N |
5663 | err = 0; |
5664 | spin_lock(&mddev->lock); | |
32a7627c | 5665 | /* bitmap disabled, zero the first byte and copy out */ |
4af1a041 | 5666 | if (!mddev->bitmap_info.file) |
32a7627c | 5667 | file->pathname[0] = '\0'; |
4af1a041 N |
5668 | else if ((ptr = d_path(&mddev->bitmap_info.file->f_path, |
5669 | file->pathname, sizeof(file->pathname))), | |
5670 | IS_ERR(ptr)) | |
5671 | err = PTR_ERR(ptr); | |
5672 | else | |
5673 | memmove(file->pathname, ptr, | |
5674 | sizeof(file->pathname)-(ptr-file->pathname)); | |
5675 | spin_unlock(&mddev->lock); | |
32a7627c | 5676 | |
4af1a041 N |
5677 | if (err == 0 && |
5678 | copy_to_user(arg, file, sizeof(*file))) | |
32a7627c | 5679 | err = -EFAULT; |
4af1a041 | 5680 | |
32a7627c N |
5681 | kfree(file); |
5682 | return err; | |
5683 | } | |
5684 | ||
f72ffdd6 | 5685 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
5686 | { |
5687 | mdu_disk_info_t info; | |
3cb03002 | 5688 | struct md_rdev *rdev; |
1da177e4 LT |
5689 | |
5690 | if (copy_from_user(&info, arg, sizeof(info))) | |
5691 | return -EFAULT; | |
5692 | ||
1ca69c4b N |
5693 | rcu_read_lock(); |
5694 | rdev = find_rdev_nr_rcu(mddev, info.number); | |
1da177e4 LT |
5695 | if (rdev) { |
5696 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5697 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5698 | info.raid_disk = rdev->raid_disk; | |
5699 | info.state = 0; | |
b2d444d7 | 5700 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5701 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5702 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5703 | info.state |= (1<<MD_DISK_ACTIVE); |
5704 | info.state |= (1<<MD_DISK_SYNC); | |
5705 | } | |
8ddf9efe N |
5706 | if (test_bit(WriteMostly, &rdev->flags)) |
5707 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5708 | } else { |
5709 | info.major = info.minor = 0; | |
5710 | info.raid_disk = -1; | |
5711 | info.state = (1<<MD_DISK_REMOVED); | |
5712 | } | |
1ca69c4b | 5713 | rcu_read_unlock(); |
1da177e4 LT |
5714 | |
5715 | if (copy_to_user(arg, &info, sizeof(info))) | |
5716 | return -EFAULT; | |
5717 | ||
5718 | return 0; | |
5719 | } | |
5720 | ||
f72ffdd6 | 5721 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5722 | { |
5723 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5724 | struct md_rdev *rdev; |
1da177e4 LT |
5725 | dev_t dev = MKDEV(info->major,info->minor); |
5726 | ||
5727 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5728 | return -EOVERFLOW; | |
5729 | ||
5730 | if (!mddev->raid_disks) { | |
5731 | int err; | |
5732 | /* expecting a device which has a superblock */ | |
5733 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5734 | if (IS_ERR(rdev)) { | |
f72ffdd6 | 5735 | printk(KERN_WARNING |
1da177e4 LT |
5736 | "md: md_import_device returned %ld\n", |
5737 | PTR_ERR(rdev)); | |
5738 | return PTR_ERR(rdev); | |
5739 | } | |
5740 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5741 | struct md_rdev *rdev0 |
5742 | = list_entry(mddev->disks.next, | |
5743 | struct md_rdev, same_set); | |
a9f326eb | 5744 | err = super_types[mddev->major_version] |
1da177e4 LT |
5745 | .load_super(rdev, rdev0, mddev->minor_version); |
5746 | if (err < 0) { | |
f72ffdd6 | 5747 | printk(KERN_WARNING |
1da177e4 | 5748 | "md: %s has different UUID to %s\n", |
f72ffdd6 | 5749 | bdevname(rdev->bdev,b), |
1da177e4 LT |
5750 | bdevname(rdev0->bdev,b2)); |
5751 | export_rdev(rdev); | |
5752 | return -EINVAL; | |
5753 | } | |
5754 | } | |
5755 | err = bind_rdev_to_array(rdev, mddev); | |
5756 | if (err) | |
5757 | export_rdev(rdev); | |
5758 | return err; | |
5759 | } | |
5760 | ||
5761 | /* | |
5762 | * add_new_disk can be used once the array is assembled | |
5763 | * to add "hot spares". They must already have a superblock | |
5764 | * written | |
5765 | */ | |
5766 | if (mddev->pers) { | |
5767 | int err; | |
5768 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5769 | printk(KERN_WARNING |
1da177e4 LT |
5770 | "%s: personality does not support diskops!\n", |
5771 | mdname(mddev)); | |
5772 | return -EINVAL; | |
5773 | } | |
7b1e35f6 N |
5774 | if (mddev->persistent) |
5775 | rdev = md_import_device(dev, mddev->major_version, | |
5776 | mddev->minor_version); | |
5777 | else | |
5778 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 5779 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5780 | printk(KERN_WARNING |
1da177e4 LT |
5781 | "md: md_import_device returned %ld\n", |
5782 | PTR_ERR(rdev)); | |
5783 | return PTR_ERR(rdev); | |
5784 | } | |
1a855a06 | 5785 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5786 | if (!mddev->persistent) { |
5787 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5788 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5789 | rdev->raid_disk = info->raid_disk; |
bf572541 | 5790 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 5791 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 5792 | } else |
41158c7e | 5793 | rdev->raid_disk = -1; |
f466722c | 5794 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
5795 | } else |
5796 | super_types[mddev->major_version]. | |
5797 | validate_super(mddev, rdev); | |
bedd86b7 | 5798 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 5799 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
5800 | /* This was a hot-add request, but events doesn't |
5801 | * match, so reject it. | |
5802 | */ | |
5803 | export_rdev(rdev); | |
5804 | return -EINVAL; | |
5805 | } | |
5806 | ||
b2d444d7 | 5807 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5808 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5809 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5810 | else |
5811 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5812 | |
1da177e4 LT |
5813 | rdev->raid_disk = -1; |
5814 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5815 | if (!err && !mddev->pers->hot_remove_disk) { |
5816 | /* If there is hot_add_disk but no hot_remove_disk | |
5817 | * then added disks for geometry changes, | |
5818 | * and should be added immediately. | |
5819 | */ | |
5820 | super_types[mddev->major_version]. | |
5821 | validate_super(mddev, rdev); | |
5822 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5823 | if (err) | |
5824 | unbind_rdev_from_array(rdev); | |
5825 | } | |
1da177e4 LT |
5826 | if (err) |
5827 | export_rdev(rdev); | |
52664732 | 5828 | else |
00bcb4ac | 5829 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5830 | |
7ceb17e8 | 5831 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
72a23c21 NB |
5832 | if (mddev->degraded) |
5833 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5834 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5835 | if (!err) |
5836 | md_new_event(mddev); | |
005eca5e | 5837 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5838 | return err; |
5839 | } | |
5840 | ||
5841 | /* otherwise, add_new_disk is only allowed | |
5842 | * for major_version==0 superblocks | |
5843 | */ | |
5844 | if (mddev->major_version != 0) { | |
5845 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5846 | mdname(mddev)); | |
5847 | return -EINVAL; | |
5848 | } | |
5849 | ||
5850 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5851 | int err; | |
d710e138 | 5852 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5853 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5854 | printk(KERN_WARNING |
1da177e4 LT |
5855 | "md: error, md_import_device() returned %ld\n", |
5856 | PTR_ERR(rdev)); | |
5857 | return PTR_ERR(rdev); | |
5858 | } | |
5859 | rdev->desc_nr = info->number; | |
5860 | if (info->raid_disk < mddev->raid_disks) | |
5861 | rdev->raid_disk = info->raid_disk; | |
5862 | else | |
5863 | rdev->raid_disk = -1; | |
5864 | ||
1da177e4 | 5865 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5866 | if (info->state & (1<<MD_DISK_SYNC)) |
5867 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5868 | |
8ddf9efe N |
5869 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5870 | set_bit(WriteMostly, &rdev->flags); | |
5871 | ||
1da177e4 LT |
5872 | if (!mddev->persistent) { |
5873 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5874 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5875 | } else | |
57b2caa3 | 5876 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5877 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5878 | |
2bf071bf N |
5879 | err = bind_rdev_to_array(rdev, mddev); |
5880 | if (err) { | |
5881 | export_rdev(rdev); | |
5882 | return err; | |
5883 | } | |
1da177e4 LT |
5884 | } |
5885 | ||
5886 | return 0; | |
5887 | } | |
5888 | ||
f72ffdd6 | 5889 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5890 | { |
5891 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 5892 | struct md_rdev *rdev; |
1da177e4 | 5893 | |
1da177e4 LT |
5894 | rdev = find_rdev(mddev, dev); |
5895 | if (!rdev) | |
5896 | return -ENXIO; | |
5897 | ||
3ea8929d N |
5898 | clear_bit(Blocked, &rdev->flags); |
5899 | remove_and_add_spares(mddev, rdev); | |
5900 | ||
1da177e4 LT |
5901 | if (rdev->raid_disk >= 0) |
5902 | goto busy; | |
5903 | ||
5904 | kick_rdev_from_array(rdev); | |
850b2b42 | 5905 | md_update_sb(mddev, 1); |
d7603b7e | 5906 | md_new_event(mddev); |
1da177e4 LT |
5907 | |
5908 | return 0; | |
5909 | busy: | |
fdefa4d8 | 5910 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5911 | bdevname(rdev->bdev,b), mdname(mddev)); |
5912 | return -EBUSY; | |
5913 | } | |
5914 | ||
f72ffdd6 | 5915 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5916 | { |
5917 | char b[BDEVNAME_SIZE]; | |
5918 | int err; | |
3cb03002 | 5919 | struct md_rdev *rdev; |
1da177e4 LT |
5920 | |
5921 | if (!mddev->pers) | |
5922 | return -ENODEV; | |
5923 | ||
5924 | if (mddev->major_version != 0) { | |
5925 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5926 | " version-0 superblocks.\n", | |
5927 | mdname(mddev)); | |
5928 | return -EINVAL; | |
5929 | } | |
5930 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5931 | printk(KERN_WARNING |
1da177e4 LT |
5932 | "%s: personality does not support diskops!\n", |
5933 | mdname(mddev)); | |
5934 | return -EINVAL; | |
5935 | } | |
5936 | ||
d710e138 | 5937 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5938 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5939 | printk(KERN_WARNING |
1da177e4 LT |
5940 | "md: error, md_import_device() returned %ld\n", |
5941 | PTR_ERR(rdev)); | |
5942 | return -EINVAL; | |
5943 | } | |
5944 | ||
5945 | if (mddev->persistent) | |
57b2caa3 | 5946 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5947 | else |
77304d2a | 5948 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5949 | |
8190e754 | 5950 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5951 | |
b2d444d7 | 5952 | if (test_bit(Faulty, &rdev->flags)) { |
f72ffdd6 | 5953 | printk(KERN_WARNING |
1da177e4 LT |
5954 | "md: can not hot-add faulty %s disk to %s!\n", |
5955 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5956 | err = -EINVAL; | |
5957 | goto abort_export; | |
5958 | } | |
b2d444d7 | 5959 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5960 | rdev->desc_nr = -1; |
5842730d | 5961 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5962 | err = bind_rdev_to_array(rdev, mddev); |
5963 | if (err) | |
5964 | goto abort_export; | |
1da177e4 LT |
5965 | |
5966 | /* | |
5967 | * The rest should better be atomic, we can have disk failures | |
5968 | * noticed in interrupt contexts ... | |
5969 | */ | |
5970 | ||
1da177e4 LT |
5971 | rdev->raid_disk = -1; |
5972 | ||
850b2b42 | 5973 | md_update_sb(mddev, 1); |
1da177e4 LT |
5974 | |
5975 | /* | |
5976 | * Kick recovery, maybe this spare has to be added to the | |
5977 | * array immediately. | |
5978 | */ | |
5979 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5980 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5981 | md_new_event(mddev); |
1da177e4 LT |
5982 | return 0; |
5983 | ||
1da177e4 LT |
5984 | abort_export: |
5985 | export_rdev(rdev); | |
5986 | return err; | |
5987 | } | |
5988 | ||
fd01b88c | 5989 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 5990 | { |
035328c2 | 5991 | int err = 0; |
32a7627c | 5992 | |
36fa3063 | 5993 | if (mddev->pers) { |
d66b1b39 | 5994 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
5995 | return -EBUSY; |
5996 | if (mddev->recovery || mddev->sync_thread) | |
5997 | return -EBUSY; | |
5998 | /* we should be able to change the bitmap.. */ | |
5999 | } | |
32a7627c | 6000 | |
36fa3063 | 6001 | if (fd >= 0) { |
035328c2 | 6002 | struct inode *inode; |
1e594bb2 N |
6003 | struct file *f; |
6004 | ||
6005 | if (mddev->bitmap || mddev->bitmap_info.file) | |
36fa3063 | 6006 | return -EEXIST; /* cannot add when bitmap is present */ |
1e594bb2 | 6007 | f = fget(fd); |
32a7627c | 6008 | |
1e594bb2 | 6009 | if (f == NULL) { |
36fa3063 N |
6010 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
6011 | mdname(mddev)); | |
6012 | return -EBADF; | |
6013 | } | |
6014 | ||
1e594bb2 | 6015 | inode = f->f_mapping->host; |
035328c2 N |
6016 | if (!S_ISREG(inode->i_mode)) { |
6017 | printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", | |
6018 | mdname(mddev)); | |
6019 | err = -EBADF; | |
1e594bb2 | 6020 | } else if (!(f->f_mode & FMODE_WRITE)) { |
035328c2 N |
6021 | printk(KERN_ERR "%s: error: bitmap file must open for write\n", |
6022 | mdname(mddev)); | |
6023 | err = -EBADF; | |
6024 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
36fa3063 N |
6025 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
6026 | mdname(mddev)); | |
035328c2 N |
6027 | err = -EBUSY; |
6028 | } | |
6029 | if (err) { | |
1e594bb2 | 6030 | fput(f); |
36fa3063 N |
6031 | return err; |
6032 | } | |
1e594bb2 | 6033 | mddev->bitmap_info.file = f; |
c3d9714e | 6034 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
6035 | } else if (mddev->bitmap == NULL) |
6036 | return -ENOENT; /* cannot remove what isn't there */ | |
6037 | err = 0; | |
6038 | if (mddev->pers) { | |
6039 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 6040 | if (fd >= 0) { |
36fa3063 | 6041 | err = bitmap_create(mddev); |
69e51b44 N |
6042 | if (!err) |
6043 | err = bitmap_load(mddev); | |
6044 | } | |
d7375ab3 | 6045 | if (fd < 0 || err) { |
36fa3063 | 6046 | bitmap_destroy(mddev); |
d7375ab3 N |
6047 | fd = -1; /* make sure to put the file */ |
6048 | } | |
36fa3063 | 6049 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
6050 | } |
6051 | if (fd < 0) { | |
4af1a041 N |
6052 | struct file *f = mddev->bitmap_info.file; |
6053 | if (f) { | |
6054 | spin_lock(&mddev->lock); | |
6055 | mddev->bitmap_info.file = NULL; | |
6056 | spin_unlock(&mddev->lock); | |
6057 | fput(f); | |
6058 | } | |
36fa3063 N |
6059 | } |
6060 | ||
32a7627c N |
6061 | return err; |
6062 | } | |
6063 | ||
1da177e4 LT |
6064 | /* |
6065 | * set_array_info is used two different ways | |
6066 | * The original usage is when creating a new array. | |
6067 | * In this usage, raid_disks is > 0 and it together with | |
6068 | * level, size, not_persistent,layout,chunksize determine the | |
6069 | * shape of the array. | |
6070 | * This will always create an array with a type-0.90.0 superblock. | |
6071 | * The newer usage is when assembling an array. | |
6072 | * In this case raid_disks will be 0, and the major_version field is | |
6073 | * use to determine which style super-blocks are to be found on the devices. | |
6074 | * The minor and patch _version numbers are also kept incase the | |
6075 | * super_block handler wishes to interpret them. | |
6076 | */ | |
f72ffdd6 | 6077 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6078 | { |
6079 | ||
6080 | if (info->raid_disks == 0) { | |
6081 | /* just setting version number for superblock loading */ | |
6082 | if (info->major_version < 0 || | |
50511da3 | 6083 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
6084 | super_types[info->major_version].name == NULL) { |
6085 | /* maybe try to auto-load a module? */ | |
f72ffdd6 | 6086 | printk(KERN_INFO |
1da177e4 LT |
6087 | "md: superblock version %d not known\n", |
6088 | info->major_version); | |
6089 | return -EINVAL; | |
6090 | } | |
6091 | mddev->major_version = info->major_version; | |
6092 | mddev->minor_version = info->minor_version; | |
6093 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 6094 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
6095 | /* ensure mddev_put doesn't delete this now that there |
6096 | * is some minimal configuration. | |
6097 | */ | |
6098 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
6099 | return 0; |
6100 | } | |
6101 | mddev->major_version = MD_MAJOR_VERSION; | |
6102 | mddev->minor_version = MD_MINOR_VERSION; | |
6103 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
6104 | mddev->ctime = get_seconds(); | |
6105 | ||
6106 | mddev->level = info->level; | |
17115e03 | 6107 | mddev->clevel[0] = 0; |
58c0fed4 | 6108 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
6109 | mddev->raid_disks = info->raid_disks; |
6110 | /* don't set md_minor, it is determined by which /dev/md* was | |
6111 | * openned | |
6112 | */ | |
6113 | if (info->state & (1<<MD_SB_CLEAN)) | |
6114 | mddev->recovery_cp = MaxSector; | |
6115 | else | |
6116 | mddev->recovery_cp = 0; | |
6117 | mddev->persistent = ! info->not_persistent; | |
e691063a | 6118 | mddev->external = 0; |
1da177e4 LT |
6119 | |
6120 | mddev->layout = info->layout; | |
9d8f0363 | 6121 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
6122 | |
6123 | mddev->max_disks = MD_SB_DISKS; | |
6124 | ||
e691063a N |
6125 | if (mddev->persistent) |
6126 | mddev->flags = 0; | |
850b2b42 | 6127 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6128 | |
c3d9714e | 6129 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 6130 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 6131 | mddev->bitmap_info.offset = 0; |
b2a2703c | 6132 | |
f6705578 N |
6133 | mddev->reshape_position = MaxSector; |
6134 | ||
1da177e4 LT |
6135 | /* |
6136 | * Generate a 128 bit UUID | |
6137 | */ | |
6138 | get_random_bytes(mddev->uuid, 16); | |
6139 | ||
f6705578 | 6140 | mddev->new_level = mddev->level; |
664e7c41 | 6141 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
6142 | mddev->new_layout = mddev->layout; |
6143 | mddev->delta_disks = 0; | |
2c810cdd | 6144 | mddev->reshape_backwards = 0; |
f6705578 | 6145 | |
1da177e4 LT |
6146 | return 0; |
6147 | } | |
6148 | ||
fd01b88c | 6149 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 6150 | { |
b522adcd DW |
6151 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
6152 | ||
6153 | if (mddev->external_size) | |
6154 | return; | |
6155 | ||
1f403624 DW |
6156 | mddev->array_sectors = array_sectors; |
6157 | } | |
6158 | EXPORT_SYMBOL(md_set_array_sectors); | |
6159 | ||
fd01b88c | 6160 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6161 | { |
3cb03002 | 6162 | struct md_rdev *rdev; |
a35b0d69 | 6163 | int rv; |
d71f9f88 | 6164 | int fit = (num_sectors == 0); |
a35b0d69 N |
6165 | |
6166 | if (mddev->pers->resize == NULL) | |
6167 | return -EINVAL; | |
d71f9f88 AN |
6168 | /* The "num_sectors" is the number of sectors of each device that |
6169 | * is used. This can only make sense for arrays with redundancy. | |
6170 | * linear and raid0 always use whatever space is available. We can only | |
6171 | * consider changing this number if no resync or reconstruction is | |
6172 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6173 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6174 | * of each device. If num_sectors is zero, we find the largest size |
6175 | * that fits. | |
a35b0d69 | 6176 | */ |
f851b60d N |
6177 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
6178 | mddev->sync_thread) | |
a35b0d69 | 6179 | return -EBUSY; |
bd8839e0 N |
6180 | if (mddev->ro) |
6181 | return -EROFS; | |
a4a6125a | 6182 | |
dafb20fa | 6183 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6184 | sector_t avail = rdev->sectors; |
01ab5662 | 6185 | |
d71f9f88 AN |
6186 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6187 | num_sectors = avail; | |
6188 | if (avail < num_sectors) | |
a35b0d69 N |
6189 | return -ENOSPC; |
6190 | } | |
d71f9f88 | 6191 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6192 | if (!rv) |
6193 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6194 | return rv; |
6195 | } | |
6196 | ||
fd01b88c | 6197 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6198 | { |
6199 | int rv; | |
c6563a8c | 6200 | struct md_rdev *rdev; |
da943b99 | 6201 | /* change the number of raid disks */ |
63c70c4f | 6202 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6203 | return -EINVAL; |
bd8839e0 N |
6204 | if (mddev->ro) |
6205 | return -EROFS; | |
da943b99 | 6206 | if (raid_disks <= 0 || |
233fca36 | 6207 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6208 | return -EINVAL; |
f851b60d N |
6209 | if (mddev->sync_thread || |
6210 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6211 | mddev->reshape_position != MaxSector) | |
da943b99 | 6212 | return -EBUSY; |
c6563a8c N |
6213 | |
6214 | rdev_for_each(rdev, mddev) { | |
6215 | if (mddev->raid_disks < raid_disks && | |
6216 | rdev->data_offset < rdev->new_data_offset) | |
6217 | return -EINVAL; | |
6218 | if (mddev->raid_disks > raid_disks && | |
6219 | rdev->data_offset > rdev->new_data_offset) | |
6220 | return -EINVAL; | |
6221 | } | |
6222 | ||
63c70c4f | 6223 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6224 | if (mddev->delta_disks < 0) |
6225 | mddev->reshape_backwards = 1; | |
6226 | else if (mddev->delta_disks > 0) | |
6227 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6228 | |
6229 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6230 | if (rv < 0) { |
de171cb9 | 6231 | mddev->delta_disks = 0; |
2c810cdd N |
6232 | mddev->reshape_backwards = 0; |
6233 | } | |
da943b99 N |
6234 | return rv; |
6235 | } | |
6236 | ||
1da177e4 LT |
6237 | /* |
6238 | * update_array_info is used to change the configuration of an | |
6239 | * on-line array. | |
6240 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6241 | * fields in the info are checked against the array. | |
6242 | * Any differences that cannot be handled will cause an error. | |
6243 | * Normally, only one change can be managed at a time. | |
6244 | */ | |
fd01b88c | 6245 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6246 | { |
6247 | int rv = 0; | |
6248 | int cnt = 0; | |
36fa3063 N |
6249 | int state = 0; |
6250 | ||
6251 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6252 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6253 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6254 | |
6255 | if (mddev->major_version != info->major_version || | |
6256 | mddev->minor_version != info->minor_version || | |
6257 | /* mddev->patch_version != info->patch_version || */ | |
6258 | mddev->ctime != info->ctime || | |
6259 | mddev->level != info->level || | |
6260 | /* mddev->layout != info->layout || */ | |
6261 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 6262 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6263 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6264 | ((state^info->state) & 0xfffffe00) | |
6265 | ) | |
1da177e4 LT |
6266 | return -EINVAL; |
6267 | /* Check there is only one change */ | |
58c0fed4 AN |
6268 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6269 | cnt++; | |
6270 | if (mddev->raid_disks != info->raid_disks) | |
6271 | cnt++; | |
6272 | if (mddev->layout != info->layout) | |
6273 | cnt++; | |
6274 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6275 | cnt++; | |
6276 | if (cnt == 0) | |
6277 | return 0; | |
6278 | if (cnt > 1) | |
6279 | return -EINVAL; | |
1da177e4 LT |
6280 | |
6281 | if (mddev->layout != info->layout) { | |
6282 | /* Change layout | |
6283 | * we don't need to do anything at the md level, the | |
6284 | * personality will take care of it all. | |
6285 | */ | |
50ac168a | 6286 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6287 | return -EINVAL; |
597a711b N |
6288 | else { |
6289 | mddev->new_layout = info->layout; | |
50ac168a | 6290 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6291 | if (rv) |
6292 | mddev->new_layout = mddev->layout; | |
6293 | return rv; | |
6294 | } | |
1da177e4 | 6295 | } |
58c0fed4 | 6296 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6297 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6298 | |
da943b99 N |
6299 | if (mddev->raid_disks != info->raid_disks) |
6300 | rv = update_raid_disks(mddev, info->raid_disks); | |
6301 | ||
36fa3063 | 6302 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
d66b1b39 | 6303 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) |
36fa3063 N |
6304 | return -EINVAL; |
6305 | if (mddev->recovery || mddev->sync_thread) | |
6306 | return -EBUSY; | |
6307 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
6308 | /* add the bitmap */ | |
6309 | if (mddev->bitmap) | |
6310 | return -EEXIST; | |
c3d9714e | 6311 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 6312 | return -EINVAL; |
c3d9714e N |
6313 | mddev->bitmap_info.offset = |
6314 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6315 | mddev->bitmap_info.space = |
6316 | mddev->bitmap_info.default_space; | |
36fa3063 N |
6317 | mddev->pers->quiesce(mddev, 1); |
6318 | rv = bitmap_create(mddev); | |
69e51b44 N |
6319 | if (!rv) |
6320 | rv = bitmap_load(mddev); | |
36fa3063 N |
6321 | if (rv) |
6322 | bitmap_destroy(mddev); | |
6323 | mddev->pers->quiesce(mddev, 0); | |
6324 | } else { | |
6325 | /* remove the bitmap */ | |
6326 | if (!mddev->bitmap) | |
6327 | return -ENOENT; | |
1ec885cd | 6328 | if (mddev->bitmap->storage.file) |
36fa3063 N |
6329 | return -EINVAL; |
6330 | mddev->pers->quiesce(mddev, 1); | |
6331 | bitmap_destroy(mddev); | |
6332 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6333 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6334 | } |
6335 | } | |
850b2b42 | 6336 | md_update_sb(mddev, 1); |
1da177e4 LT |
6337 | return rv; |
6338 | } | |
6339 | ||
fd01b88c | 6340 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6341 | { |
3cb03002 | 6342 | struct md_rdev *rdev; |
1ca69c4b | 6343 | int err = 0; |
1da177e4 LT |
6344 | |
6345 | if (mddev->pers == NULL) | |
6346 | return -ENODEV; | |
6347 | ||
1ca69c4b N |
6348 | rcu_read_lock(); |
6349 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6350 | if (!rdev) |
1ca69c4b N |
6351 | err = -ENODEV; |
6352 | else { | |
6353 | md_error(mddev, rdev); | |
6354 | if (!test_bit(Faulty, &rdev->flags)) | |
6355 | err = -EBUSY; | |
6356 | } | |
6357 | rcu_read_unlock(); | |
6358 | return err; | |
1da177e4 LT |
6359 | } |
6360 | ||
2f9618ce AN |
6361 | /* |
6362 | * We have a problem here : there is no easy way to give a CHS | |
6363 | * virtual geometry. We currently pretend that we have a 2 heads | |
6364 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6365 | * dosfs just mad... ;-) | |
6366 | */ | |
a885c8c4 CH |
6367 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6368 | { | |
fd01b88c | 6369 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6370 | |
6371 | geo->heads = 2; | |
6372 | geo->sectors = 4; | |
49ce6cea | 6373 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6374 | return 0; |
6375 | } | |
6376 | ||
cb335f88 NS |
6377 | static inline bool md_ioctl_valid(unsigned int cmd) |
6378 | { | |
6379 | switch (cmd) { | |
6380 | case ADD_NEW_DISK: | |
6381 | case BLKROSET: | |
6382 | case GET_ARRAY_INFO: | |
6383 | case GET_BITMAP_FILE: | |
6384 | case GET_DISK_INFO: | |
6385 | case HOT_ADD_DISK: | |
6386 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
6387 | case RAID_AUTORUN: |
6388 | case RAID_VERSION: | |
6389 | case RESTART_ARRAY_RW: | |
6390 | case RUN_ARRAY: | |
6391 | case SET_ARRAY_INFO: | |
6392 | case SET_BITMAP_FILE: | |
6393 | case SET_DISK_FAULTY: | |
6394 | case STOP_ARRAY: | |
6395 | case STOP_ARRAY_RO: | |
6396 | return true; | |
6397 | default: | |
6398 | return false; | |
6399 | } | |
6400 | } | |
6401 | ||
a39907fa | 6402 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6403 | unsigned int cmd, unsigned long arg) |
6404 | { | |
6405 | int err = 0; | |
6406 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6407 | struct mddev *mddev = NULL; |
e2218350 | 6408 | int ro; |
1da177e4 | 6409 | |
cb335f88 NS |
6410 | if (!md_ioctl_valid(cmd)) |
6411 | return -ENOTTY; | |
6412 | ||
506c9e44 N |
6413 | switch (cmd) { |
6414 | case RAID_VERSION: | |
6415 | case GET_ARRAY_INFO: | |
6416 | case GET_DISK_INFO: | |
6417 | break; | |
6418 | default: | |
6419 | if (!capable(CAP_SYS_ADMIN)) | |
6420 | return -EACCES; | |
6421 | } | |
1da177e4 LT |
6422 | |
6423 | /* | |
6424 | * Commands dealing with the RAID driver but not any | |
6425 | * particular array: | |
6426 | */ | |
c02c0aeb N |
6427 | switch (cmd) { |
6428 | case RAID_VERSION: | |
6429 | err = get_version(argp); | |
3adc28d8 | 6430 | goto out; |
1da177e4 | 6431 | |
1da177e4 | 6432 | #ifndef MODULE |
c02c0aeb N |
6433 | case RAID_AUTORUN: |
6434 | err = 0; | |
6435 | autostart_arrays(arg); | |
3adc28d8 | 6436 | goto out; |
1da177e4 | 6437 | #endif |
c02c0aeb | 6438 | default:; |
1da177e4 LT |
6439 | } |
6440 | ||
6441 | /* | |
6442 | * Commands creating/starting a new array: | |
6443 | */ | |
6444 | ||
a39907fa | 6445 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6446 | |
6447 | if (!mddev) { | |
6448 | BUG(); | |
3adc28d8 | 6449 | goto out; |
1da177e4 LT |
6450 | } |
6451 | ||
1ca69c4b N |
6452 | /* Some actions do not requires the mutex */ |
6453 | switch (cmd) { | |
6454 | case GET_ARRAY_INFO: | |
6455 | if (!mddev->raid_disks && !mddev->external) | |
6456 | err = -ENODEV; | |
6457 | else | |
6458 | err = get_array_info(mddev, argp); | |
3adc28d8 | 6459 | goto out; |
1ca69c4b N |
6460 | |
6461 | case GET_DISK_INFO: | |
6462 | if (!mddev->raid_disks && !mddev->external) | |
6463 | err = -ENODEV; | |
6464 | else | |
6465 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 6466 | goto out; |
1ca69c4b N |
6467 | |
6468 | case SET_DISK_FAULTY: | |
6469 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6470 | goto out; |
4af1a041 N |
6471 | |
6472 | case GET_BITMAP_FILE: | |
6473 | err = get_bitmap_file(mddev, argp); | |
6474 | goto out; | |
6475 | ||
1ca69c4b N |
6476 | } |
6477 | ||
a7a3f08d N |
6478 | if (cmd == ADD_NEW_DISK) |
6479 | /* need to ensure md_delayed_delete() has completed */ | |
6480 | flush_workqueue(md_misc_wq); | |
6481 | ||
90f5f7ad HR |
6482 | if (cmd == HOT_REMOVE_DISK) |
6483 | /* need to ensure recovery thread has run */ | |
6484 | wait_event_interruptible_timeout(mddev->sb_wait, | |
6485 | !test_bit(MD_RECOVERY_NEEDED, | |
6486 | &mddev->flags), | |
6487 | msecs_to_jiffies(5000)); | |
260fa034 N |
6488 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
6489 | /* Need to flush page cache, and ensure no-one else opens | |
6490 | * and writes | |
6491 | */ | |
6492 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 6493 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
6494 | mutex_unlock(&mddev->open_mutex); |
6495 | err = -EBUSY; | |
3adc28d8 | 6496 | goto out; |
260fa034 N |
6497 | } |
6498 | set_bit(MD_STILL_CLOSED, &mddev->flags); | |
6499 | mutex_unlock(&mddev->open_mutex); | |
6500 | sync_blockdev(bdev); | |
6501 | } | |
1da177e4 LT |
6502 | err = mddev_lock(mddev); |
6503 | if (err) { | |
f72ffdd6 | 6504 | printk(KERN_INFO |
1da177e4 LT |
6505 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
6506 | err, cmd); | |
3adc28d8 | 6507 | goto out; |
1da177e4 LT |
6508 | } |
6509 | ||
c02c0aeb N |
6510 | if (cmd == SET_ARRAY_INFO) { |
6511 | mdu_array_info_t info; | |
6512 | if (!arg) | |
6513 | memset(&info, 0, sizeof(info)); | |
6514 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6515 | err = -EFAULT; | |
3adc28d8 | 6516 | goto unlock; |
c02c0aeb N |
6517 | } |
6518 | if (mddev->pers) { | |
6519 | err = update_array_info(mddev, &info); | |
6520 | if (err) { | |
6521 | printk(KERN_WARNING "md: couldn't update" | |
6522 | " array info. %d\n", err); | |
3adc28d8 | 6523 | goto unlock; |
1da177e4 | 6524 | } |
3adc28d8 | 6525 | goto unlock; |
c02c0aeb N |
6526 | } |
6527 | if (!list_empty(&mddev->disks)) { | |
6528 | printk(KERN_WARNING | |
6529 | "md: array %s already has disks!\n", | |
6530 | mdname(mddev)); | |
6531 | err = -EBUSY; | |
3adc28d8 | 6532 | goto unlock; |
c02c0aeb N |
6533 | } |
6534 | if (mddev->raid_disks) { | |
6535 | printk(KERN_WARNING | |
6536 | "md: array %s already initialised!\n", | |
6537 | mdname(mddev)); | |
6538 | err = -EBUSY; | |
3adc28d8 | 6539 | goto unlock; |
c02c0aeb N |
6540 | } |
6541 | err = set_array_info(mddev, &info); | |
6542 | if (err) { | |
6543 | printk(KERN_WARNING "md: couldn't set" | |
6544 | " array info. %d\n", err); | |
3adc28d8 | 6545 | goto unlock; |
c02c0aeb | 6546 | } |
3adc28d8 | 6547 | goto unlock; |
1da177e4 LT |
6548 | } |
6549 | ||
6550 | /* | |
6551 | * Commands querying/configuring an existing array: | |
6552 | */ | |
32a7627c | 6553 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6554 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6555 | if ((!mddev->raid_disks && !mddev->external) |
6556 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6557 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6558 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 6559 | err = -ENODEV; |
3adc28d8 | 6560 | goto unlock; |
1da177e4 LT |
6561 | } |
6562 | ||
6563 | /* | |
6564 | * Commands even a read-only array can execute: | |
6565 | */ | |
c02c0aeb | 6566 | switch (cmd) { |
c02c0aeb N |
6567 | case RESTART_ARRAY_RW: |
6568 | err = restart_array(mddev); | |
3adc28d8 | 6569 | goto unlock; |
1da177e4 | 6570 | |
c02c0aeb N |
6571 | case STOP_ARRAY: |
6572 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 6573 | goto unlock; |
1da177e4 | 6574 | |
c02c0aeb N |
6575 | case STOP_ARRAY_RO: |
6576 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 6577 | goto unlock; |
1da177e4 | 6578 | |
3ea8929d N |
6579 | case HOT_REMOVE_DISK: |
6580 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6581 | goto unlock; |
3ea8929d | 6582 | |
7ceb17e8 N |
6583 | case ADD_NEW_DISK: |
6584 | /* We can support ADD_NEW_DISK on read-only arrays | |
6585 | * on if we are re-adding a preexisting device. | |
6586 | * So require mddev->pers and MD_DISK_SYNC. | |
6587 | */ | |
6588 | if (mddev->pers) { | |
6589 | mdu_disk_info_t info; | |
6590 | if (copy_from_user(&info, argp, sizeof(info))) | |
6591 | err = -EFAULT; | |
6592 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6593 | /* Need to clear read-only for this */ | |
6594 | break; | |
6595 | else | |
6596 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6597 | goto unlock; |
7ceb17e8 N |
6598 | } |
6599 | break; | |
6600 | ||
c02c0aeb N |
6601 | case BLKROSET: |
6602 | if (get_user(ro, (int __user *)(arg))) { | |
6603 | err = -EFAULT; | |
3adc28d8 | 6604 | goto unlock; |
c02c0aeb N |
6605 | } |
6606 | err = -EINVAL; | |
e2218350 | 6607 | |
c02c0aeb N |
6608 | /* if the bdev is going readonly the value of mddev->ro |
6609 | * does not matter, no writes are coming | |
6610 | */ | |
6611 | if (ro) | |
3adc28d8 | 6612 | goto unlock; |
e2218350 | 6613 | |
c02c0aeb N |
6614 | /* are we are already prepared for writes? */ |
6615 | if (mddev->ro != 1) | |
3adc28d8 | 6616 | goto unlock; |
e2218350 | 6617 | |
c02c0aeb N |
6618 | /* transitioning to readauto need only happen for |
6619 | * arrays that call md_write_start | |
6620 | */ | |
6621 | if (mddev->pers) { | |
6622 | err = restart_array(mddev); | |
6623 | if (err == 0) { | |
6624 | mddev->ro = 2; | |
6625 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6626 | } |
c02c0aeb | 6627 | } |
3adc28d8 | 6628 | goto unlock; |
1da177e4 LT |
6629 | } |
6630 | ||
6631 | /* | |
6632 | * The remaining ioctls are changing the state of the | |
f91de92e | 6633 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 6634 | */ |
326eb17d | 6635 | if (mddev->ro && mddev->pers) { |
f91de92e N |
6636 | if (mddev->ro == 2) { |
6637 | mddev->ro = 0; | |
00bcb4ac | 6638 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6639 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6640 | /* mddev_unlock will wake thread */ |
6641 | /* If a device failed while we were read-only, we | |
6642 | * need to make sure the metadata is updated now. | |
6643 | */ | |
6644 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6645 | mddev_unlock(mddev); | |
6646 | wait_event(mddev->sb_wait, | |
6647 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6648 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
29f097c4 | 6649 | mddev_lock_nointr(mddev); |
f3378b48 | 6650 | } |
f91de92e N |
6651 | } else { |
6652 | err = -EROFS; | |
3adc28d8 | 6653 | goto unlock; |
f91de92e | 6654 | } |
1da177e4 LT |
6655 | } |
6656 | ||
c02c0aeb N |
6657 | switch (cmd) { |
6658 | case ADD_NEW_DISK: | |
1da177e4 | 6659 | { |
c02c0aeb N |
6660 | mdu_disk_info_t info; |
6661 | if (copy_from_user(&info, argp, sizeof(info))) | |
6662 | err = -EFAULT; | |
6663 | else | |
6664 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6665 | goto unlock; |
c02c0aeb | 6666 | } |
1da177e4 | 6667 | |
c02c0aeb N |
6668 | case HOT_ADD_DISK: |
6669 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6670 | goto unlock; |
1da177e4 | 6671 | |
c02c0aeb N |
6672 | case RUN_ARRAY: |
6673 | err = do_md_run(mddev); | |
3adc28d8 | 6674 | goto unlock; |
1da177e4 | 6675 | |
c02c0aeb N |
6676 | case SET_BITMAP_FILE: |
6677 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 6678 | goto unlock; |
32a7627c | 6679 | |
c02c0aeb N |
6680 | default: |
6681 | err = -EINVAL; | |
3adc28d8 | 6682 | goto unlock; |
1da177e4 LT |
6683 | } |
6684 | ||
3adc28d8 | 6685 | unlock: |
d3374825 N |
6686 | if (mddev->hold_active == UNTIL_IOCTL && |
6687 | err != -EINVAL) | |
6688 | mddev->hold_active = 0; | |
1da177e4 | 6689 | mddev_unlock(mddev); |
3adc28d8 | 6690 | out: |
1da177e4 LT |
6691 | return err; |
6692 | } | |
aa98aa31 AB |
6693 | #ifdef CONFIG_COMPAT |
6694 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6695 | unsigned int cmd, unsigned long arg) | |
6696 | { | |
6697 | switch (cmd) { | |
6698 | case HOT_REMOVE_DISK: | |
6699 | case HOT_ADD_DISK: | |
6700 | case SET_DISK_FAULTY: | |
6701 | case SET_BITMAP_FILE: | |
6702 | /* These take in integer arg, do not convert */ | |
6703 | break; | |
6704 | default: | |
6705 | arg = (unsigned long)compat_ptr(arg); | |
6706 | break; | |
6707 | } | |
6708 | ||
6709 | return md_ioctl(bdev, mode, cmd, arg); | |
6710 | } | |
6711 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6712 | |
a39907fa | 6713 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6714 | { |
6715 | /* | |
6716 | * Succeed if we can lock the mddev, which confirms that | |
6717 | * it isn't being stopped right now. | |
6718 | */ | |
fd01b88c | 6719 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6720 | int err; |
6721 | ||
0c098220 YL |
6722 | if (!mddev) |
6723 | return -ENODEV; | |
6724 | ||
d3374825 N |
6725 | if (mddev->gendisk != bdev->bd_disk) { |
6726 | /* we are racing with mddev_put which is discarding this | |
6727 | * bd_disk. | |
6728 | */ | |
6729 | mddev_put(mddev); | |
6730 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6731 | flush_workqueue(md_misc_wq); |
d3374825 N |
6732 | /* Then retry the open from the top */ |
6733 | return -ERESTARTSYS; | |
6734 | } | |
6735 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6736 | ||
c8c00a69 | 6737 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6738 | goto out; |
6739 | ||
6740 | err = 0; | |
f2ea68cf | 6741 | atomic_inc(&mddev->openers); |
260fa034 | 6742 | clear_bit(MD_STILL_CLOSED, &mddev->flags); |
c8c00a69 | 6743 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6744 | |
f0b4f7e2 | 6745 | check_disk_change(bdev); |
1da177e4 LT |
6746 | out: |
6747 | return err; | |
6748 | } | |
6749 | ||
db2a144b | 6750 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6751 | { |
f72ffdd6 | 6752 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6753 | |
52e5f9d1 | 6754 | BUG_ON(!mddev); |
f2ea68cf | 6755 | atomic_dec(&mddev->openers); |
1da177e4 | 6756 | mddev_put(mddev); |
1da177e4 | 6757 | } |
f0b4f7e2 N |
6758 | |
6759 | static int md_media_changed(struct gendisk *disk) | |
6760 | { | |
fd01b88c | 6761 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6762 | |
6763 | return mddev->changed; | |
6764 | } | |
6765 | ||
6766 | static int md_revalidate(struct gendisk *disk) | |
6767 | { | |
fd01b88c | 6768 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6769 | |
6770 | mddev->changed = 0; | |
6771 | return 0; | |
6772 | } | |
83d5cde4 | 6773 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6774 | { |
6775 | .owner = THIS_MODULE, | |
a39907fa AV |
6776 | .open = md_open, |
6777 | .release = md_release, | |
b492b852 | 6778 | .ioctl = md_ioctl, |
aa98aa31 AB |
6779 | #ifdef CONFIG_COMPAT |
6780 | .compat_ioctl = md_compat_ioctl, | |
6781 | #endif | |
a885c8c4 | 6782 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6783 | .media_changed = md_media_changed, |
6784 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6785 | }; |
6786 | ||
f72ffdd6 | 6787 | static int md_thread(void *arg) |
1da177e4 | 6788 | { |
2b8bf345 | 6789 | struct md_thread *thread = arg; |
1da177e4 | 6790 | |
1da177e4 LT |
6791 | /* |
6792 | * md_thread is a 'system-thread', it's priority should be very | |
6793 | * high. We avoid resource deadlocks individually in each | |
6794 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6795 | * the very same RT priority as kswapd, thus we will never get | |
6796 | * into a priority inversion deadlock. | |
6797 | * | |
6798 | * we definitely have to have equal or higher priority than | |
6799 | * bdflush, otherwise bdflush will deadlock if there are too | |
6800 | * many dirty RAID5 blocks. | |
6801 | */ | |
1da177e4 | 6802 | |
6985c43f | 6803 | allow_signal(SIGKILL); |
a6fb0934 | 6804 | while (!kthread_should_stop()) { |
1da177e4 | 6805 | |
93588e22 N |
6806 | /* We need to wait INTERRUPTIBLE so that |
6807 | * we don't add to the load-average. | |
6808 | * That means we need to be sure no signals are | |
6809 | * pending | |
6810 | */ | |
6811 | if (signal_pending(current)) | |
6812 | flush_signals(current); | |
6813 | ||
6814 | wait_event_interruptible_timeout | |
6815 | (thread->wqueue, | |
6816 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6817 | || kthread_should_stop(), | |
6818 | thread->timeout); | |
1da177e4 | 6819 | |
6c987910 N |
6820 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6821 | if (!kthread_should_stop()) | |
4ed8731d | 6822 | thread->run(thread); |
1da177e4 | 6823 | } |
a6fb0934 | 6824 | |
1da177e4 LT |
6825 | return 0; |
6826 | } | |
6827 | ||
2b8bf345 | 6828 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
6829 | { |
6830 | if (thread) { | |
36a4e1fe | 6831 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
6832 | set_bit(THREAD_WAKEUP, &thread->flags); |
6833 | wake_up(&thread->wqueue); | |
6834 | } | |
6835 | } | |
6c144d31 | 6836 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 6837 | |
4ed8731d SL |
6838 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
6839 | struct mddev *mddev, const char *name) | |
1da177e4 | 6840 | { |
2b8bf345 | 6841 | struct md_thread *thread; |
1da177e4 | 6842 | |
2b8bf345 | 6843 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
6844 | if (!thread) |
6845 | return NULL; | |
6846 | ||
1da177e4 LT |
6847 | init_waitqueue_head(&thread->wqueue); |
6848 | ||
1da177e4 LT |
6849 | thread->run = run; |
6850 | thread->mddev = mddev; | |
32a7627c | 6851 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6852 | thread->tsk = kthread_run(md_thread, thread, |
6853 | "%s_%s", | |
6854 | mdname(thread->mddev), | |
0232605d | 6855 | name); |
a6fb0934 | 6856 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6857 | kfree(thread); |
6858 | return NULL; | |
6859 | } | |
1da177e4 LT |
6860 | return thread; |
6861 | } | |
6c144d31 | 6862 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 6863 | |
2b8bf345 | 6864 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 6865 | { |
2b8bf345 | 6866 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
6867 | if (!thread) |
6868 | return; | |
36a4e1fe | 6869 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
6870 | /* Locking ensures that mddev_unlock does not wake_up a |
6871 | * non-existent thread | |
6872 | */ | |
6873 | spin_lock(&pers_lock); | |
6874 | *threadp = NULL; | |
6875 | spin_unlock(&pers_lock); | |
a6fb0934 N |
6876 | |
6877 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6878 | kfree(thread); |
6879 | } | |
6c144d31 | 6880 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 6881 | |
fd01b88c | 6882 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 6883 | { |
b2d444d7 | 6884 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6885 | return; |
6bfe0b49 | 6886 | |
de393cde | 6887 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
6888 | return; |
6889 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6890 | if (mddev->degraded) |
6891 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6892 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6893 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6894 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6895 | md_wakeup_thread(mddev->thread); | |
768a418d | 6896 | if (mddev->event_work.func) |
e804ac78 | 6897 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6898 | md_new_event_inintr(mddev); |
1da177e4 | 6899 | } |
6c144d31 | 6900 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
6901 | |
6902 | /* seq_file implementation /proc/mdstat */ | |
6903 | ||
6904 | static void status_unused(struct seq_file *seq) | |
6905 | { | |
6906 | int i = 0; | |
3cb03002 | 6907 | struct md_rdev *rdev; |
1da177e4 LT |
6908 | |
6909 | seq_printf(seq, "unused devices: "); | |
6910 | ||
159ec1fc | 6911 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6912 | char b[BDEVNAME_SIZE]; |
6913 | i++; | |
6914 | seq_printf(seq, "%s ", | |
6915 | bdevname(rdev->bdev,b)); | |
6916 | } | |
6917 | if (!i) | |
6918 | seq_printf(seq, "<none>"); | |
6919 | ||
6920 | seq_printf(seq, "\n"); | |
6921 | } | |
6922 | ||
f72ffdd6 | 6923 | static void status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 6924 | { |
dd71cf6b N |
6925 | sector_t max_sectors, resync, res; |
6926 | unsigned long dt, db; | |
6927 | sector_t rt; | |
4588b42e N |
6928 | int scale; |
6929 | unsigned int per_milli; | |
1da177e4 | 6930 | |
72f36d59 N |
6931 | if (mddev->curr_resync <= 3) |
6932 | resync = 0; | |
6933 | else | |
6934 | resync = mddev->curr_resync | |
6935 | - atomic_read(&mddev->recovery_active); | |
1da177e4 | 6936 | |
c804cdec N |
6937 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
6938 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 6939 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6940 | else |
dd71cf6b | 6941 | max_sectors = mddev->dev_sectors; |
1da177e4 | 6942 | |
403df478 | 6943 | WARN_ON(max_sectors == 0); |
4588b42e | 6944 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6945 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6946 | * u32, as those are the requirements for sector_div. |
6947 | * Thus 'scale' must be at least 10 | |
6948 | */ | |
6949 | scale = 10; | |
6950 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6951 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6952 | scale++; |
6953 | } | |
6954 | res = (resync>>scale)*1000; | |
dd71cf6b | 6955 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6956 | |
6957 | per_milli = res; | |
1da177e4 | 6958 | { |
4588b42e | 6959 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6960 | seq_printf(seq, "["); |
6961 | for (i = 0; i < x; i++) | |
6962 | seq_printf(seq, "="); | |
6963 | seq_printf(seq, ">"); | |
6964 | for (i = 0; i < y; i++) | |
6965 | seq_printf(seq, "."); | |
6966 | seq_printf(seq, "] "); | |
6967 | } | |
4588b42e | 6968 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6969 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6970 | "reshape" : | |
61df9d91 N |
6971 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6972 | "check" : | |
6973 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6974 | "resync" : "recovery"))), | |
6975 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6976 | (unsigned long long) resync/2, |
6977 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6978 | |
6979 | /* | |
1da177e4 LT |
6980 | * dt: time from mark until now |
6981 | * db: blocks written from mark until now | |
6982 | * rt: remaining time | |
dd71cf6b N |
6983 | * |
6984 | * rt is a sector_t, so could be 32bit or 64bit. | |
6985 | * So we divide before multiply in case it is 32bit and close | |
6986 | * to the limit. | |
25985edc | 6987 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6988 | * near the end of resync when the number of remaining sectors |
6989 | * is close to 'db'. | |
6990 | * We then divide rt by 32 after multiplying by db to compensate. | |
6991 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6992 | */ |
6993 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6994 | if (!dt) dt++; | |
ff4e8d9a N |
6995 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6996 | - mddev->resync_mark_cnt; | |
1da177e4 | 6997 | |
dd71cf6b N |
6998 | rt = max_sectors - resync; /* number of remaining sectors */ |
6999 | sector_div(rt, db/32+1); | |
7000 | rt *= dt; | |
7001 | rt >>= 5; | |
7002 | ||
7003 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
7004 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 7005 | |
ff4e8d9a | 7006 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
7007 | } |
7008 | ||
7009 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
7010 | { | |
7011 | struct list_head *tmp; | |
7012 | loff_t l = *pos; | |
fd01b88c | 7013 | struct mddev *mddev; |
1da177e4 LT |
7014 | |
7015 | if (l >= 0x10000) | |
7016 | return NULL; | |
7017 | if (!l--) | |
7018 | /* header */ | |
7019 | return (void*)1; | |
7020 | ||
7021 | spin_lock(&all_mddevs_lock); | |
7022 | list_for_each(tmp,&all_mddevs) | |
7023 | if (!l--) { | |
fd01b88c | 7024 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
7025 | mddev_get(mddev); |
7026 | spin_unlock(&all_mddevs_lock); | |
7027 | return mddev; | |
7028 | } | |
7029 | spin_unlock(&all_mddevs_lock); | |
7030 | if (!l--) | |
7031 | return (void*)2;/* tail */ | |
7032 | return NULL; | |
7033 | } | |
7034 | ||
7035 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
7036 | { | |
7037 | struct list_head *tmp; | |
fd01b88c | 7038 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 7039 | |
1da177e4 LT |
7040 | ++*pos; |
7041 | if (v == (void*)2) | |
7042 | return NULL; | |
7043 | ||
7044 | spin_lock(&all_mddevs_lock); | |
7045 | if (v == (void*)1) | |
7046 | tmp = all_mddevs.next; | |
7047 | else | |
7048 | tmp = mddev->all_mddevs.next; | |
7049 | if (tmp != &all_mddevs) | |
fd01b88c | 7050 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
7051 | else { |
7052 | next_mddev = (void*)2; | |
7053 | *pos = 0x10000; | |
f72ffdd6 | 7054 | } |
1da177e4 LT |
7055 | spin_unlock(&all_mddevs_lock); |
7056 | ||
7057 | if (v != (void*)1) | |
7058 | mddev_put(mddev); | |
7059 | return next_mddev; | |
7060 | ||
7061 | } | |
7062 | ||
7063 | static void md_seq_stop(struct seq_file *seq, void *v) | |
7064 | { | |
fd01b88c | 7065 | struct mddev *mddev = v; |
1da177e4 LT |
7066 | |
7067 | if (mddev && v != (void*)1 && v != (void*)2) | |
7068 | mddev_put(mddev); | |
7069 | } | |
7070 | ||
7071 | static int md_seq_show(struct seq_file *seq, void *v) | |
7072 | { | |
fd01b88c | 7073 | struct mddev *mddev = v; |
dd8ac336 | 7074 | sector_t sectors; |
3cb03002 | 7075 | struct md_rdev *rdev; |
1da177e4 LT |
7076 | |
7077 | if (v == (void*)1) { | |
84fc4b56 | 7078 | struct md_personality *pers; |
1da177e4 LT |
7079 | seq_printf(seq, "Personalities : "); |
7080 | spin_lock(&pers_lock); | |
2604b703 N |
7081 | list_for_each_entry(pers, &pers_list, list) |
7082 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
7083 | |
7084 | spin_unlock(&pers_lock); | |
7085 | seq_printf(seq, "\n"); | |
f1514638 | 7086 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
7087 | return 0; |
7088 | } | |
7089 | if (v == (void*)2) { | |
7090 | status_unused(seq); | |
7091 | return 0; | |
7092 | } | |
7093 | ||
36d091f4 | 7094 | spin_lock(&mddev->lock); |
1da177e4 LT |
7095 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
7096 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
7097 | mddev->pers ? "" : "in"); | |
7098 | if (mddev->pers) { | |
f91de92e | 7099 | if (mddev->ro==1) |
1da177e4 | 7100 | seq_printf(seq, " (read-only)"); |
f91de92e | 7101 | if (mddev->ro==2) |
52720ae7 | 7102 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
7103 | seq_printf(seq, " %s", mddev->pers->name); |
7104 | } | |
7105 | ||
dd8ac336 | 7106 | sectors = 0; |
f97fcad3 N |
7107 | rcu_read_lock(); |
7108 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 LT |
7109 | char b[BDEVNAME_SIZE]; |
7110 | seq_printf(seq, " %s[%d]", | |
7111 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
7112 | if (test_bit(WriteMostly, &rdev->flags)) |
7113 | seq_printf(seq, "(W)"); | |
b2d444d7 | 7114 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7115 | seq_printf(seq, "(F)"); |
7116 | continue; | |
2d78f8c4 N |
7117 | } |
7118 | if (rdev->raid_disk < 0) | |
b325a32e | 7119 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
7120 | if (test_bit(Replacement, &rdev->flags)) |
7121 | seq_printf(seq, "(R)"); | |
dd8ac336 | 7122 | sectors += rdev->sectors; |
1da177e4 | 7123 | } |
f97fcad3 | 7124 | rcu_read_unlock(); |
1da177e4 LT |
7125 | |
7126 | if (!list_empty(&mddev->disks)) { | |
7127 | if (mddev->pers) | |
7128 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
7129 | (unsigned long long) |
7130 | mddev->array_sectors / 2); | |
1da177e4 LT |
7131 | else |
7132 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 7133 | (unsigned long long)sectors / 2); |
1da177e4 | 7134 | } |
1cd6bf19 N |
7135 | if (mddev->persistent) { |
7136 | if (mddev->major_version != 0 || | |
7137 | mddev->minor_version != 90) { | |
7138 | seq_printf(seq," super %d.%d", | |
7139 | mddev->major_version, | |
7140 | mddev->minor_version); | |
7141 | } | |
e691063a N |
7142 | } else if (mddev->external) |
7143 | seq_printf(seq, " super external:%s", | |
7144 | mddev->metadata_type); | |
7145 | else | |
1cd6bf19 | 7146 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
7147 | |
7148 | if (mddev->pers) { | |
d710e138 | 7149 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 7150 | seq_printf(seq, "\n "); |
8e1b39d6 N |
7151 | if (mddev->pers->sync_request) { |
7152 | if (mddev->curr_resync > 2) { | |
d710e138 | 7153 | status_resync(seq, mddev); |
8e1b39d6 | 7154 | seq_printf(seq, "\n "); |
72f36d59 | 7155 | } else if (mddev->curr_resync >= 1) |
8e1b39d6 N |
7156 | seq_printf(seq, "\tresync=DELAYED\n "); |
7157 | else if (mddev->recovery_cp < MaxSector) | |
7158 | seq_printf(seq, "\tresync=PENDING\n "); | |
7159 | } | |
32a7627c N |
7160 | } else |
7161 | seq_printf(seq, "\n "); | |
7162 | ||
57148964 | 7163 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7164 | |
7165 | seq_printf(seq, "\n"); | |
7166 | } | |
36d091f4 | 7167 | spin_unlock(&mddev->lock); |
f72ffdd6 | 7168 | |
1da177e4 LT |
7169 | return 0; |
7170 | } | |
7171 | ||
110518bc | 7172 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7173 | .start = md_seq_start, |
7174 | .next = md_seq_next, | |
7175 | .stop = md_seq_stop, | |
7176 | .show = md_seq_show, | |
7177 | }; | |
7178 | ||
7179 | static int md_seq_open(struct inode *inode, struct file *file) | |
7180 | { | |
f1514638 | 7181 | struct seq_file *seq; |
1da177e4 LT |
7182 | int error; |
7183 | ||
7184 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7185 | if (error) |
f1514638 KS |
7186 | return error; |
7187 | ||
7188 | seq = file->private_data; | |
7189 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7190 | return error; |
7191 | } | |
7192 | ||
e2f23b60 | 7193 | static int md_unloading; |
d7603b7e N |
7194 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7195 | { | |
f1514638 | 7196 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7197 | int mask; |
7198 | ||
e2f23b60 | 7199 | if (md_unloading) |
7d7e64f2 | 7200 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7201 | poll_wait(filp, &md_event_waiters, wait); |
7202 | ||
7203 | /* always allow read */ | |
7204 | mask = POLLIN | POLLRDNORM; | |
7205 | ||
f1514638 | 7206 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7207 | mask |= POLLERR | POLLPRI; |
7208 | return mask; | |
7209 | } | |
7210 | ||
fa027c2a | 7211 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7212 | .owner = THIS_MODULE, |
1da177e4 LT |
7213 | .open = md_seq_open, |
7214 | .read = seq_read, | |
7215 | .llseek = seq_lseek, | |
c3f94b40 | 7216 | .release = seq_release_private, |
d7603b7e | 7217 | .poll = mdstat_poll, |
1da177e4 LT |
7218 | }; |
7219 | ||
84fc4b56 | 7220 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7221 | { |
50bd3774 CY |
7222 | printk(KERN_INFO "md: %s personality registered for level %d\n", |
7223 | p->name, p->level); | |
1da177e4 | 7224 | spin_lock(&pers_lock); |
2604b703 | 7225 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7226 | spin_unlock(&pers_lock); |
7227 | return 0; | |
7228 | } | |
6c144d31 | 7229 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7230 | |
84fc4b56 | 7231 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7232 | { |
2604b703 | 7233 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7234 | spin_lock(&pers_lock); |
2604b703 | 7235 | list_del_init(&p->list); |
1da177e4 LT |
7236 | spin_unlock(&pers_lock); |
7237 | return 0; | |
7238 | } | |
6c144d31 | 7239 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7240 | |
fd01b88c | 7241 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7242 | { |
f72ffdd6 | 7243 | struct md_rdev *rdev; |
1da177e4 | 7244 | int idle; |
eea1bf38 | 7245 | int curr_events; |
1da177e4 LT |
7246 | |
7247 | idle = 1; | |
4b80991c N |
7248 | rcu_read_lock(); |
7249 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7250 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7251 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7252 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7253 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7254 | /* sync IO will cause sync_io to increase before the disk_stats |
7255 | * as sync_io is counted when a request starts, and | |
7256 | * disk_stats is counted when it completes. | |
7257 | * So resync activity will cause curr_events to be smaller than | |
7258 | * when there was no such activity. | |
7259 | * non-sync IO will cause disk_stat to increase without | |
7260 | * increasing sync_io so curr_events will (eventually) | |
7261 | * be larger than it was before. Once it becomes | |
7262 | * substantially larger, the test below will cause | |
7263 | * the array to appear non-idle, and resync will slow | |
7264 | * down. | |
7265 | * If there is a lot of outstanding resync activity when | |
7266 | * we set last_event to curr_events, then all that activity | |
7267 | * completing might cause the array to appear non-idle | |
7268 | * and resync will be slowed down even though there might | |
7269 | * not have been non-resync activity. This will only | |
7270 | * happen once though. 'last_events' will soon reflect | |
7271 | * the state where there is little or no outstanding | |
7272 | * resync requests, and further resync activity will | |
7273 | * always make curr_events less than last_events. | |
c0e48521 | 7274 | * |
1da177e4 | 7275 | */ |
eea1bf38 | 7276 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7277 | rdev->last_events = curr_events; |
7278 | idle = 0; | |
7279 | } | |
7280 | } | |
4b80991c | 7281 | rcu_read_unlock(); |
1da177e4 LT |
7282 | return idle; |
7283 | } | |
7284 | ||
fd01b88c | 7285 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7286 | { |
7287 | /* another "blocks" (512byte) blocks have been synced */ | |
7288 | atomic_sub(blocks, &mddev->recovery_active); | |
7289 | wake_up(&mddev->recovery_wait); | |
7290 | if (!ok) { | |
dfc70645 | 7291 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7292 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7293 | md_wakeup_thread(mddev->thread); |
7294 | // stop recovery, signal do_sync .... | |
7295 | } | |
7296 | } | |
6c144d31 | 7297 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 7298 | |
06d91a5f N |
7299 | /* md_write_start(mddev, bi) |
7300 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7301 | * in superblock) before writing, schedule a superblock update |
7302 | * and wait for it to complete. | |
06d91a5f | 7303 | */ |
fd01b88c | 7304 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7305 | { |
0fd62b86 | 7306 | int did_change = 0; |
06d91a5f | 7307 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7308 | return; |
06d91a5f | 7309 | |
f91de92e N |
7310 | BUG_ON(mddev->ro == 1); |
7311 | if (mddev->ro == 2) { | |
7312 | /* need to switch to read/write */ | |
7313 | mddev->ro = 0; | |
7314 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7315 | md_wakeup_thread(mddev->thread); | |
25156198 | 7316 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7317 | did_change = 1; |
f91de92e | 7318 | } |
06d91a5f | 7319 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7320 | if (mddev->safemode == 1) |
7321 | mddev->safemode = 0; | |
06d91a5f | 7322 | if (mddev->in_sync) { |
85572d7c | 7323 | spin_lock(&mddev->lock); |
3d310eb7 N |
7324 | if (mddev->in_sync) { |
7325 | mddev->in_sync = 0; | |
850b2b42 | 7326 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7327 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7328 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7329 | did_change = 1; |
3d310eb7 | 7330 | } |
85572d7c | 7331 | spin_unlock(&mddev->lock); |
06d91a5f | 7332 | } |
0fd62b86 | 7333 | if (did_change) |
00bcb4ac | 7334 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7335 | wait_event(mddev->sb_wait, |
09a44cc1 | 7336 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 | 7337 | } |
6c144d31 | 7338 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 7339 | |
fd01b88c | 7340 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7341 | { |
7342 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7343 | if (mddev->safemode == 2) | |
7344 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7345 | else if (mddev->safemode_delay) |
1da177e4 LT |
7346 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7347 | } | |
7348 | } | |
6c144d31 | 7349 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 7350 | |
2a2275d6 N |
7351 | /* md_allow_write(mddev) |
7352 | * Calling this ensures that the array is marked 'active' so that writes | |
7353 | * may proceed without blocking. It is important to call this before | |
7354 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7355 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7356 | * |
7357 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7358 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7359 | */ |
fd01b88c | 7360 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7361 | { |
7362 | if (!mddev->pers) | |
b5470dc5 | 7363 | return 0; |
2a2275d6 | 7364 | if (mddev->ro) |
b5470dc5 | 7365 | return 0; |
1a0fd497 | 7366 | if (!mddev->pers->sync_request) |
b5470dc5 | 7367 | return 0; |
2a2275d6 | 7368 | |
85572d7c | 7369 | spin_lock(&mddev->lock); |
2a2275d6 N |
7370 | if (mddev->in_sync) { |
7371 | mddev->in_sync = 0; | |
7372 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7373 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7374 | if (mddev->safemode_delay && |
7375 | mddev->safemode == 0) | |
7376 | mddev->safemode = 1; | |
85572d7c | 7377 | spin_unlock(&mddev->lock); |
2a2275d6 | 7378 | md_update_sb(mddev, 0); |
00bcb4ac | 7379 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 | 7380 | } else |
85572d7c | 7381 | spin_unlock(&mddev->lock); |
b5470dc5 | 7382 | |
070dc6dd | 7383 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7384 | return -EAGAIN; |
7385 | else | |
7386 | return 0; | |
2a2275d6 N |
7387 | } |
7388 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7389 | ||
1da177e4 LT |
7390 | #define SYNC_MARKS 10 |
7391 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7392 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7393 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7394 | { |
4ed8731d | 7395 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7396 | struct mddev *mddev2; |
1da177e4 LT |
7397 | unsigned int currspeed = 0, |
7398 | window; | |
ac7e50a3 | 7399 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 7400 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7401 | unsigned long update_time; |
1da177e4 LT |
7402 | sector_t mark_cnt[SYNC_MARKS]; |
7403 | int last_mark,m; | |
7404 | struct list_head *tmp; | |
7405 | sector_t last_check; | |
57afd89f | 7406 | int skipped = 0; |
3cb03002 | 7407 | struct md_rdev *rdev; |
c4a39551 | 7408 | char *desc, *action = NULL; |
7c2c57c9 | 7409 | struct blk_plug plug; |
1da177e4 LT |
7410 | |
7411 | /* just incase thread restarts... */ | |
7412 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7413 | return; | |
3991b31e N |
7414 | if (mddev->ro) {/* never try to sync a read-only array */ |
7415 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 7416 | return; |
3991b31e | 7417 | } |
1da177e4 | 7418 | |
61df9d91 | 7419 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 7420 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 7421 | desc = "data-check"; |
c4a39551 JB |
7422 | action = "check"; |
7423 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 7424 | desc = "requested-resync"; |
c4a39551 JB |
7425 | action = "repair"; |
7426 | } else | |
61df9d91 N |
7427 | desc = "resync"; |
7428 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7429 | desc = "reshape"; | |
7430 | else | |
7431 | desc = "recovery"; | |
7432 | ||
c4a39551 JB |
7433 | mddev->last_sync_action = action ?: desc; |
7434 | ||
1da177e4 LT |
7435 | /* we overload curr_resync somewhat here. |
7436 | * 0 == not engaged in resync at all | |
7437 | * 2 == checking that there is no conflict with another sync | |
7438 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7439 | * commense | |
7440 | * other == active in resync - this many blocks | |
7441 | * | |
7442 | * Before starting a resync we must have set curr_resync to | |
7443 | * 2, and then checked that every "conflicting" array has curr_resync | |
7444 | * less than ours. When we find one that is the same or higher | |
7445 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7446 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7447 | * This will mean we have to start checking from the beginning again. | |
7448 | * | |
7449 | */ | |
7450 | ||
7451 | do { | |
7452 | mddev->curr_resync = 2; | |
7453 | ||
7454 | try_again: | |
404e4b43 | 7455 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 7456 | goto skip; |
29ac4aa3 | 7457 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7458 | if (mddev2 == mddev) |
7459 | continue; | |
90b08710 BS |
7460 | if (!mddev->parallel_resync |
7461 | && mddev2->curr_resync | |
7462 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7463 | DEFINE_WAIT(wq); |
7464 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7465 | /* arbitrarily yield */ | |
7466 | mddev->curr_resync = 1; | |
7467 | wake_up(&resync_wait); | |
7468 | } | |
7469 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7470 | /* no need to wait here, we can wait the next | |
7471 | * time 'round when curr_resync == 2 | |
7472 | */ | |
7473 | continue; | |
9744197c N |
7474 | /* We need to wait 'interruptible' so as not to |
7475 | * contribute to the load average, and not to | |
7476 | * be caught by 'softlockup' | |
7477 | */ | |
7478 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 7479 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 7480 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7481 | printk(KERN_INFO "md: delaying %s of %s" |
7482 | " until %s has finished (they" | |
1da177e4 | 7483 | " share one or more physical units)\n", |
61df9d91 | 7484 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7485 | mddev_put(mddev2); |
9744197c N |
7486 | if (signal_pending(current)) |
7487 | flush_signals(current); | |
1da177e4 LT |
7488 | schedule(); |
7489 | finish_wait(&resync_wait, &wq); | |
7490 | goto try_again; | |
7491 | } | |
7492 | finish_wait(&resync_wait, &wq); | |
7493 | } | |
7494 | } | |
7495 | } while (mddev->curr_resync < 2); | |
7496 | ||
5fd6c1dc | 7497 | j = 0; |
9d88883e | 7498 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7499 | /* resync follows the size requested by the personality, |
57afd89f | 7500 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7501 | */ |
7502 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7503 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7504 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7505 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7506 | j = mddev->resync_min; | |
7507 | else if (!mddev->bitmap) | |
5fd6c1dc | 7508 | j = mddev->recovery_cp; |
5e96ee65 | 7509 | |
ccfcc3c1 | 7510 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7511 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7512 | else { |
1da177e4 | 7513 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7514 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7515 | j = MaxSector; |
4e59ca7d | 7516 | rcu_read_lock(); |
dafb20fa | 7517 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc N |
7518 | if (rdev->raid_disk >= 0 && |
7519 | !test_bit(Faulty, &rdev->flags) && | |
7520 | !test_bit(In_sync, &rdev->flags) && | |
7521 | rdev->recovery_offset < j) | |
7522 | j = rdev->recovery_offset; | |
4e59ca7d | 7523 | rcu_read_unlock(); |
133d4527 N |
7524 | |
7525 | /* If there is a bitmap, we need to make sure all | |
7526 | * writes that started before we added a spare | |
7527 | * complete before we start doing a recovery. | |
7528 | * Otherwise the write might complete and (via | |
7529 | * bitmap_endwrite) set a bit in the bitmap after the | |
7530 | * recovery has checked that bit and skipped that | |
7531 | * region. | |
7532 | */ | |
7533 | if (mddev->bitmap) { | |
7534 | mddev->pers->quiesce(mddev, 1); | |
7535 | mddev->pers->quiesce(mddev, 0); | |
7536 | } | |
5fd6c1dc | 7537 | } |
1da177e4 | 7538 | |
61df9d91 N |
7539 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7540 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7541 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7542 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7543 | "(but not more than %d KB/sec) for %s.\n", |
7544 | speed_max(mddev), desc); | |
1da177e4 | 7545 | |
eea1bf38 | 7546 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7547 | |
57afd89f | 7548 | io_sectors = 0; |
1da177e4 LT |
7549 | for (m = 0; m < SYNC_MARKS; m++) { |
7550 | mark[m] = jiffies; | |
57afd89f | 7551 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7552 | } |
7553 | last_mark = 0; | |
7554 | mddev->resync_mark = mark[last_mark]; | |
7555 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7556 | ||
7557 | /* | |
7558 | * Tune reconstruction: | |
7559 | */ | |
7560 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7561 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7562 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7563 | |
7564 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7565 | last_check = 0; |
7566 | ||
7567 | if (j>2) { | |
c91abf5a | 7568 | printk(KERN_INFO |
61df9d91 N |
7569 | "md: resuming %s of %s from checkpoint.\n", |
7570 | desc, mdname(mddev)); | |
1da177e4 | 7571 | mddev->curr_resync = j; |
72f36d59 N |
7572 | } else |
7573 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7574 | mddev->curr_resync_completed = j; |
72f36d59 N |
7575 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7576 | md_new_event(mddev); | |
54f89341 | 7577 | update_time = jiffies; |
1da177e4 | 7578 | |
7c2c57c9 | 7579 | blk_start_plug(&plug); |
1da177e4 | 7580 | while (j < max_sectors) { |
57afd89f | 7581 | sector_t sectors; |
1da177e4 | 7582 | |
57afd89f | 7583 | skipped = 0; |
97e4f42d | 7584 | |
7a91ee1f N |
7585 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7586 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7587 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7588 | > (max_sectors >> 4)) || | |
54f89341 | 7589 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f N |
7590 | (j - mddev->curr_resync_completed)*2 |
7591 | >= mddev->resync_max - mddev->curr_resync_completed | |
7592 | )) { | |
97e4f42d | 7593 | /* time to update curr_resync_completed */ |
97e4f42d N |
7594 | wait_event(mddev->recovery_wait, |
7595 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7596 | mddev->curr_resync_completed = j; |
35d78c66 | 7597 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
7598 | j > mddev->recovery_cp) | |
7599 | mddev->recovery_cp = j; | |
54f89341 | 7600 | update_time = jiffies; |
070dc6dd | 7601 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7602 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7603 | } |
acb180b0 | 7604 | |
c91abf5a N |
7605 | while (j >= mddev->resync_max && |
7606 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
7607 | /* As this condition is controlled by user-space, |
7608 | * we can block indefinitely, so use '_interruptible' | |
7609 | * to avoid triggering warnings. | |
7610 | */ | |
7611 | flush_signals(current); /* just in case */ | |
7612 | wait_event_interruptible(mddev->recovery_wait, | |
7613 | mddev->resync_max > j | |
c91abf5a N |
7614 | || test_bit(MD_RECOVERY_INTR, |
7615 | &mddev->recovery)); | |
e62e58a5 | 7616 | } |
acb180b0 | 7617 | |
c91abf5a N |
7618 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7619 | break; | |
acb180b0 | 7620 | |
57afd89f | 7621 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7622 | currspeed < speed_min(mddev)); |
57afd89f | 7623 | if (sectors == 0) { |
dfc70645 | 7624 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 7625 | break; |
1da177e4 | 7626 | } |
57afd89f N |
7627 | |
7628 | if (!skipped) { /* actual IO requested */ | |
7629 | io_sectors += sectors; | |
7630 | atomic_add(sectors, &mddev->recovery_active); | |
7631 | } | |
7632 | ||
e875ecea N |
7633 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7634 | break; | |
7635 | ||
1da177e4 | 7636 | j += sectors; |
72f36d59 N |
7637 | if (j > 2) |
7638 | mddev->curr_resync = j; | |
ff4e8d9a | 7639 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7640 | if (last_check == 0) |
e875ecea | 7641 | /* this is the earliest that rebuild will be |
d7603b7e N |
7642 | * visible in /proc/mdstat |
7643 | */ | |
7644 | md_new_event(mddev); | |
57afd89f N |
7645 | |
7646 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7647 | continue; |
7648 | ||
57afd89f | 7649 | last_check = io_sectors; |
1da177e4 LT |
7650 | repeat: |
7651 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7652 | /* step marks */ | |
7653 | int next = (last_mark+1) % SYNC_MARKS; | |
7654 | ||
7655 | mddev->resync_mark = mark[next]; | |
7656 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7657 | mark[next] = jiffies; | |
57afd89f | 7658 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7659 | last_mark = next; |
7660 | } | |
7661 | ||
c91abf5a N |
7662 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7663 | break; | |
1da177e4 LT |
7664 | |
7665 | /* | |
7666 | * this loop exits only if either when we are slower than | |
7667 | * the 'hard' speed limit, or the system was IO-idle for | |
7668 | * a jiffy. | |
7669 | * the system might be non-idle CPU-wise, but we only care | |
7670 | * about not overloading the IO subsystem. (things like an | |
7671 | * e2fsck being done on the RAID array should execute fast) | |
7672 | */ | |
1da177e4 LT |
7673 | cond_resched(); |
7674 | ||
ac7e50a3 XN |
7675 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
7676 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 7677 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 7678 | |
88202a0c N |
7679 | if (currspeed > speed_min(mddev)) { |
7680 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7681 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7682 | msleep(500); |
1da177e4 LT |
7683 | goto repeat; |
7684 | } | |
7685 | } | |
7686 | } | |
c91abf5a N |
7687 | printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
7688 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
7689 | ? "interrupted" : "done"); | |
1da177e4 LT |
7690 | /* |
7691 | * this also signals 'finished resyncing' to md_stop | |
7692 | */ | |
7c2c57c9 | 7693 | blk_finish_plug(&plug); |
1da177e4 LT |
7694 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7695 | ||
7696 | /* tell personality that we are finished */ | |
57afd89f | 7697 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7698 | |
dfc70645 | 7699 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7700 | mddev->curr_resync > 2) { |
7701 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7702 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7703 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7704 | printk(KERN_INFO | |
61df9d91 N |
7705 | "md: checkpointing %s of %s.\n", |
7706 | desc, mdname(mddev)); | |
0a19caab | 7707 | if (test_bit(MD_RECOVERY_ERROR, |
7708 | &mddev->recovery)) | |
7709 | mddev->recovery_cp = | |
7710 | mddev->curr_resync_completed; | |
7711 | else | |
7712 | mddev->recovery_cp = | |
7713 | mddev->curr_resync; | |
5fd6c1dc N |
7714 | } |
7715 | } else | |
7716 | mddev->recovery_cp = MaxSector; | |
7717 | } else { | |
7718 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7719 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 7720 | rcu_read_lock(); |
dafb20fa | 7721 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7722 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7723 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7724 | !test_bit(Faulty, &rdev->flags) && |
7725 | !test_bit(In_sync, &rdev->flags) && | |
7726 | rdev->recovery_offset < mddev->curr_resync) | |
7727 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7728 | rcu_read_unlock(); |
5fd6c1dc | 7729 | } |
1da177e4 | 7730 | } |
db91ff55 | 7731 | skip: |
17571284 | 7732 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7733 | |
23da422b | 7734 | spin_lock(&mddev->lock); |
c07b70ad N |
7735 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7736 | /* We completed so min/max setting can be forgotten if used. */ | |
7737 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7738 | mddev->resync_min = 0; | |
7739 | mddev->resync_max = MaxSector; | |
7740 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7741 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 | 7742 | mddev->curr_resync = 0; |
23da422b N |
7743 | spin_unlock(&mddev->lock); |
7744 | ||
1da177e4 LT |
7745 | wake_up(&resync_wait); |
7746 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7747 | md_wakeup_thread(mddev->thread); | |
c6207277 | 7748 | return; |
1da177e4 | 7749 | } |
29269553 | 7750 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7751 | |
746d3207 N |
7752 | static int remove_and_add_spares(struct mddev *mddev, |
7753 | struct md_rdev *this) | |
b4c4c7b8 | 7754 | { |
3cb03002 | 7755 | struct md_rdev *rdev; |
b4c4c7b8 | 7756 | int spares = 0; |
f2a371c5 | 7757 | int removed = 0; |
b4c4c7b8 | 7758 | |
dafb20fa | 7759 | rdev_for_each(rdev, mddev) |
746d3207 N |
7760 | if ((this == NULL || rdev == this) && |
7761 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 7762 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7763 | (test_bit(Faulty, &rdev->flags) || |
7764 | ! test_bit(In_sync, &rdev->flags)) && | |
7765 | atomic_read(&rdev->nr_pending)==0) { | |
7766 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7767 | mddev, rdev) == 0) { |
36fad858 | 7768 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 7769 | rdev->raid_disk = -1; |
f2a371c5 | 7770 | removed++; |
b4c4c7b8 N |
7771 | } |
7772 | } | |
90584fc9 JB |
7773 | if (removed && mddev->kobj.sd) |
7774 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 7775 | |
746d3207 N |
7776 | if (this) |
7777 | goto no_add; | |
7778 | ||
dafb20fa | 7779 | rdev_for_each(rdev, mddev) { |
7bfec5f3 N |
7780 | if (rdev->raid_disk >= 0 && |
7781 | !test_bit(In_sync, &rdev->flags) && | |
7782 | !test_bit(Faulty, &rdev->flags)) | |
7783 | spares++; | |
7ceb17e8 N |
7784 | if (rdev->raid_disk >= 0) |
7785 | continue; | |
7786 | if (test_bit(Faulty, &rdev->flags)) | |
7787 | continue; | |
7788 | if (mddev->ro && | |
8313b8e5 N |
7789 | ! (rdev->saved_raid_disk >= 0 && |
7790 | !test_bit(Bitmap_sync, &rdev->flags))) | |
7ceb17e8 N |
7791 | continue; |
7792 | ||
7eb41885 N |
7793 | if (rdev->saved_raid_disk < 0) |
7794 | rdev->recovery_offset = 0; | |
7ceb17e8 N |
7795 | if (mddev->pers-> |
7796 | hot_add_disk(mddev, rdev) == 0) { | |
7797 | if (sysfs_link_rdev(mddev, rdev)) | |
7798 | /* failure here is OK */; | |
7799 | spares++; | |
7800 | md_new_event(mddev); | |
7801 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 7802 | } |
b4c4c7b8 | 7803 | } |
746d3207 | 7804 | no_add: |
6dafab6b N |
7805 | if (removed) |
7806 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
7807 | return spares; |
7808 | } | |
7ebc0be7 | 7809 | |
ac05f256 N |
7810 | static void md_start_sync(struct work_struct *ws) |
7811 | { | |
7812 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
7813 | ||
7814 | mddev->sync_thread = md_register_thread(md_do_sync, | |
7815 | mddev, | |
7816 | "resync"); | |
7817 | if (!mddev->sync_thread) { | |
7818 | printk(KERN_ERR "%s: could not start resync" | |
7819 | " thread...\n", | |
7820 | mdname(mddev)); | |
7821 | /* leave the spares where they are, it shouldn't hurt */ | |
7822 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7823 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7824 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7825 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7826 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7827 | wake_up(&resync_wait); |
ac05f256 N |
7828 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
7829 | &mddev->recovery)) | |
7830 | if (mddev->sysfs_action) | |
7831 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7832 | } else | |
7833 | md_wakeup_thread(mddev->sync_thread); | |
7834 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7835 | md_new_event(mddev); | |
7836 | } | |
7837 | ||
1da177e4 LT |
7838 | /* |
7839 | * This routine is regularly called by all per-raid-array threads to | |
7840 | * deal with generic issues like resync and super-block update. | |
7841 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7842 | * need this as they never do any recovery or update the superblock. | |
7843 | * | |
7844 | * It does not do any resync itself, but rather "forks" off other threads | |
7845 | * to do that as needed. | |
7846 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7847 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7848 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7849 | * and wakeups up this thread which will reap the thread and finish up. |
7850 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7851 | * | |
7852 | * The overall approach is: | |
7853 | * 1/ if the superblock needs updating, update it. | |
7854 | * 2/ If a recovery thread is running, don't do anything else. | |
7855 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7856 | * 4/ If there are any faulty devices, remove them. | |
7857 | * 5/ If array is degraded, try to add spares devices | |
7858 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7859 | */ | |
fd01b88c | 7860 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 7861 | { |
68866e42 JB |
7862 | if (mddev->suspended) |
7863 | return; | |
7864 | ||
5f40402d | 7865 | if (mddev->bitmap) |
aa5cbd10 | 7866 | bitmap_daemon_work(mddev); |
1da177e4 | 7867 | |
fca4d848 | 7868 | if (signal_pending(current)) { |
31a59e34 | 7869 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7870 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7871 | mdname(mddev)); | |
7872 | mddev->safemode = 2; | |
7873 | } | |
7874 | flush_signals(current); | |
7875 | } | |
7876 | ||
c89a8eee N |
7877 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7878 | return; | |
1da177e4 | 7879 | if ( ! ( |
142d44c3 | 7880 | (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7881 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7882 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7883 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7884 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7885 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7886 | )) |
7887 | return; | |
fca4d848 | 7888 | |
df5b89b3 | 7889 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7890 | int spares = 0; |
fca4d848 | 7891 | |
c89a8eee | 7892 | if (mddev->ro) { |
7ceb17e8 N |
7893 | /* On a read-only array we can: |
7894 | * - remove failed devices | |
7895 | * - add already-in_sync devices if the array itself | |
7896 | * is in-sync. | |
7897 | * As we only add devices that are already in-sync, | |
7898 | * we can activate the spares immediately. | |
c89a8eee | 7899 | */ |
7ceb17e8 | 7900 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
7901 | /* There is no thread, but we need to call |
7902 | * ->spare_active and clear saved_raid_disk | |
7903 | */ | |
2ac295a5 | 7904 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 N |
7905 | md_reap_sync_thread(mddev); |
7906 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
c89a8eee N |
7907 | goto unlock; |
7908 | } | |
7909 | ||
31a59e34 | 7910 | if (!mddev->external) { |
0fd62b86 | 7911 | int did_change = 0; |
85572d7c | 7912 | spin_lock(&mddev->lock); |
31a59e34 N |
7913 | if (mddev->safemode && |
7914 | !atomic_read(&mddev->writes_pending) && | |
7915 | !mddev->in_sync && | |
7916 | mddev->recovery_cp == MaxSector) { | |
7917 | mddev->in_sync = 1; | |
0fd62b86 | 7918 | did_change = 1; |
070dc6dd | 7919 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7920 | } |
7921 | if (mddev->safemode == 1) | |
7922 | mddev->safemode = 0; | |
85572d7c | 7923 | spin_unlock(&mddev->lock); |
0fd62b86 | 7924 | if (did_change) |
00bcb4ac | 7925 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7926 | } |
fca4d848 | 7927 | |
7a0a5355 | 7928 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 7929 | md_update_sb(mddev, 0); |
06d91a5f | 7930 | |
1da177e4 LT |
7931 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7932 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7933 | /* resync/recovery still happening */ | |
7934 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7935 | goto unlock; | |
7936 | } | |
7937 | if (mddev->sync_thread) { | |
a91d5ac0 | 7938 | md_reap_sync_thread(mddev); |
1da177e4 LT |
7939 | goto unlock; |
7940 | } | |
72a23c21 NB |
7941 | /* Set RUNNING before clearing NEEDED to avoid |
7942 | * any transients in the value of "sync_action". | |
7943 | */ | |
72f36d59 | 7944 | mddev->curr_resync_completed = 0; |
23da422b | 7945 | spin_lock(&mddev->lock); |
72a23c21 | 7946 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
23da422b | 7947 | spin_unlock(&mddev->lock); |
24dd469d N |
7948 | /* Clear some bits that don't mean anything, but |
7949 | * might be left set | |
7950 | */ | |
24dd469d N |
7951 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7952 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7953 | |
ed209584 N |
7954 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
7955 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 7956 | goto not_running; |
1da177e4 LT |
7957 | /* no recovery is running. |
7958 | * remove any failed drives, then | |
7959 | * add spares if possible. | |
72f36d59 | 7960 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
7961 | * the personality to fail the re-add. |
7962 | */ | |
1da177e4 | 7963 | |
b4c4c7b8 | 7964 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7965 | if (mddev->pers->check_reshape == NULL || |
7966 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 7967 | /* Cannot proceed */ |
ac05f256 | 7968 | goto not_running; |
b4c4c7b8 | 7969 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 7970 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 7971 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
7972 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7973 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7974 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7975 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7976 | } else if (mddev->recovery_cp < MaxSector) { |
7977 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7978 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7979 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7980 | /* nothing to be done ... */ | |
ac05f256 | 7981 | goto not_running; |
24dd469d | 7982 | |
1da177e4 | 7983 | if (mddev->pers->sync_request) { |
ef99bf48 | 7984 | if (spares) { |
a654b9d8 N |
7985 | /* We are adding a device or devices to an array |
7986 | * which has the bitmap stored on all devices. | |
7987 | * So make sure all bitmap pages get written | |
7988 | */ | |
7989 | bitmap_write_all(mddev->bitmap); | |
7990 | } | |
ac05f256 N |
7991 | INIT_WORK(&mddev->del_work, md_start_sync); |
7992 | queue_work(md_misc_wq, &mddev->del_work); | |
7993 | goto unlock; | |
1da177e4 | 7994 | } |
ac05f256 | 7995 | not_running: |
72a23c21 NB |
7996 | if (!mddev->sync_thread) { |
7997 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7998 | wake_up(&resync_wait); |
72a23c21 NB |
7999 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8000 | &mddev->recovery)) | |
0c3573f1 | 8001 | if (mddev->sysfs_action) |
00bcb4ac | 8002 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 8003 | } |
ac05f256 N |
8004 | unlock: |
8005 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
8006 | mddev_unlock(mddev); |
8007 | } | |
8008 | } | |
6c144d31 | 8009 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 8010 | |
a91d5ac0 JB |
8011 | void md_reap_sync_thread(struct mddev *mddev) |
8012 | { | |
8013 | struct md_rdev *rdev; | |
8014 | ||
8015 | /* resync has finished, collect result */ | |
8016 | md_unregister_thread(&mddev->sync_thread); | |
8017 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8018 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
8019 | /* success...*/ | |
8020 | /* activate any spares */ | |
8021 | if (mddev->pers->spare_active(mddev)) { | |
8022 | sysfs_notify(&mddev->kobj, NULL, | |
8023 | "degraded"); | |
8024 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
8025 | } | |
8026 | } | |
8027 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
8028 | mddev->pers->finish_reshape) | |
8029 | mddev->pers->finish_reshape(mddev); | |
8030 | ||
8031 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 8032 | * information must be scrapped. |
a91d5ac0 | 8033 | */ |
f466722c N |
8034 | if (!mddev->degraded) |
8035 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
8036 | rdev->saved_raid_disk = -1; |
8037 | ||
8038 | md_update_sb(mddev, 1); | |
8039 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
8040 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
8041 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8042 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8043 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 8044 | wake_up(&resync_wait); |
a91d5ac0 JB |
8045 | /* flag recovery needed just to double check */ |
8046 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8047 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8048 | md_new_event(mddev); | |
8049 | if (mddev->event_work.func) | |
8050 | queue_work(md_misc_wq, &mddev->event_work); | |
8051 | } | |
6c144d31 | 8052 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 8053 | |
fd01b88c | 8054 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 8055 | { |
00bcb4ac | 8056 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 8057 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
8058 | !test_bit(Blocked, &rdev->flags) && |
8059 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
8060 | msecs_to_jiffies(5000)); |
8061 | rdev_dec_pending(rdev, mddev); | |
8062 | } | |
8063 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
8064 | ||
c6563a8c N |
8065 | void md_finish_reshape(struct mddev *mddev) |
8066 | { | |
8067 | /* called be personality module when reshape completes. */ | |
8068 | struct md_rdev *rdev; | |
8069 | ||
8070 | rdev_for_each(rdev, mddev) { | |
8071 | if (rdev->data_offset > rdev->new_data_offset) | |
8072 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
8073 | else | |
8074 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
8075 | rdev->data_offset = rdev->new_data_offset; | |
8076 | } | |
8077 | } | |
8078 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
8079 | |
8080 | /* Bad block management. | |
8081 | * We can record which blocks on each device are 'bad' and so just | |
8082 | * fail those blocks, or that stripe, rather than the whole device. | |
8083 | * Entries in the bad-block table are 64bits wide. This comprises: | |
8084 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
8085 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
8086 | * A 'shift' can be set so that larger blocks are tracked and | |
8087 | * consequently larger devices can be covered. | |
8088 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
8089 | * | |
8090 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
8091 | * might need to retry if it is very unlucky. | |
8092 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
8093 | * so we use the write_seqlock_irq variant. | |
8094 | * | |
8095 | * When looking for a bad block we specify a range and want to | |
8096 | * know if any block in the range is bad. So we binary-search | |
8097 | * to the last range that starts at-or-before the given endpoint, | |
8098 | * (or "before the sector after the target range") | |
8099 | * then see if it ends after the given start. | |
8100 | * We return | |
8101 | * 0 if there are no known bad blocks in the range | |
8102 | * 1 if there are known bad block which are all acknowledged | |
8103 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
8104 | * plus the start/length of the first bad section we overlap. | |
8105 | */ | |
8106 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
8107 | sector_t *first_bad, int *bad_sectors) | |
8108 | { | |
8109 | int hi; | |
ab05613a | 8110 | int lo; |
2230dfe4 | 8111 | u64 *p = bb->page; |
ab05613a | 8112 | int rv; |
2230dfe4 N |
8113 | sector_t target = s + sectors; |
8114 | unsigned seq; | |
8115 | ||
8116 | if (bb->shift > 0) { | |
8117 | /* round the start down, and the end up */ | |
8118 | s >>= bb->shift; | |
8119 | target += (1<<bb->shift) - 1; | |
8120 | target >>= bb->shift; | |
8121 | sectors = target - s; | |
8122 | } | |
8123 | /* 'target' is now the first block after the bad range */ | |
8124 | ||
8125 | retry: | |
8126 | seq = read_seqbegin(&bb->lock); | |
ab05613a | 8127 | lo = 0; |
8128 | rv = 0; | |
2230dfe4 N |
8129 | hi = bb->count; |
8130 | ||
8131 | /* Binary search between lo and hi for 'target' | |
8132 | * i.e. for the last range that starts before 'target' | |
8133 | */ | |
8134 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
8135 | * are known not to be the last range before target. | |
8136 | * VARIANT: hi-lo is the number of possible | |
8137 | * ranges, and decreases until it reaches 1 | |
8138 | */ | |
8139 | while (hi - lo > 1) { | |
8140 | int mid = (lo + hi) / 2; | |
8141 | sector_t a = BB_OFFSET(p[mid]); | |
8142 | if (a < target) | |
8143 | /* This could still be the one, earlier ranges | |
8144 | * could not. */ | |
8145 | lo = mid; | |
8146 | else | |
8147 | /* This and later ranges are definitely out. */ | |
8148 | hi = mid; | |
8149 | } | |
8150 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
8151 | if (hi > lo) { | |
8152 | /* need to check all range that end after 's' to see if | |
8153 | * any are unacknowledged. | |
8154 | */ | |
8155 | while (lo >= 0 && | |
8156 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8157 | if (BB_OFFSET(p[lo]) < target) { | |
8158 | /* starts before the end, and finishes after | |
8159 | * the start, so they must overlap | |
8160 | */ | |
8161 | if (rv != -1 && BB_ACK(p[lo])) | |
8162 | rv = 1; | |
8163 | else | |
8164 | rv = -1; | |
8165 | *first_bad = BB_OFFSET(p[lo]); | |
8166 | *bad_sectors = BB_LEN(p[lo]); | |
8167 | } | |
8168 | lo--; | |
8169 | } | |
8170 | } | |
8171 | ||
8172 | if (read_seqretry(&bb->lock, seq)) | |
8173 | goto retry; | |
8174 | ||
8175 | return rv; | |
8176 | } | |
8177 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
8178 | ||
8179 | /* | |
8180 | * Add a range of bad blocks to the table. | |
8181 | * This might extend the table, or might contract it | |
8182 | * if two adjacent ranges can be merged. | |
8183 | * We binary-search to find the 'insertion' point, then | |
8184 | * decide how best to handle it. | |
8185 | */ | |
8186 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
8187 | int acknowledged) | |
8188 | { | |
8189 | u64 *p; | |
8190 | int lo, hi; | |
8191 | int rv = 1; | |
905b0297 | 8192 | unsigned long flags; |
2230dfe4 N |
8193 | |
8194 | if (bb->shift < 0) | |
8195 | /* badblocks are disabled */ | |
8196 | return 0; | |
8197 | ||
8198 | if (bb->shift) { | |
8199 | /* round the start down, and the end up */ | |
8200 | sector_t next = s + sectors; | |
8201 | s >>= bb->shift; | |
8202 | next += (1<<bb->shift) - 1; | |
8203 | next >>= bb->shift; | |
8204 | sectors = next - s; | |
8205 | } | |
8206 | ||
905b0297 | 8207 | write_seqlock_irqsave(&bb->lock, flags); |
2230dfe4 N |
8208 | |
8209 | p = bb->page; | |
8210 | lo = 0; | |
8211 | hi = bb->count; | |
8212 | /* Find the last range that starts at-or-before 's' */ | |
8213 | while (hi - lo > 1) { | |
8214 | int mid = (lo + hi) / 2; | |
8215 | sector_t a = BB_OFFSET(p[mid]); | |
8216 | if (a <= s) | |
8217 | lo = mid; | |
8218 | else | |
8219 | hi = mid; | |
8220 | } | |
8221 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8222 | hi = lo; | |
8223 | ||
8224 | if (hi > lo) { | |
8225 | /* we found a range that might merge with the start | |
8226 | * of our new range | |
8227 | */ | |
8228 | sector_t a = BB_OFFSET(p[lo]); | |
8229 | sector_t e = a + BB_LEN(p[lo]); | |
8230 | int ack = BB_ACK(p[lo]); | |
8231 | if (e >= s) { | |
8232 | /* Yes, we can merge with a previous range */ | |
8233 | if (s == a && s + sectors >= e) | |
8234 | /* new range covers old */ | |
8235 | ack = acknowledged; | |
8236 | else | |
8237 | ack = ack && acknowledged; | |
8238 | ||
8239 | if (e < s + sectors) | |
8240 | e = s + sectors; | |
8241 | if (e - a <= BB_MAX_LEN) { | |
8242 | p[lo] = BB_MAKE(a, e-a, ack); | |
8243 | s = e; | |
8244 | } else { | |
8245 | /* does not all fit in one range, | |
8246 | * make p[lo] maximal | |
8247 | */ | |
8248 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8249 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8250 | s = a + BB_MAX_LEN; | |
8251 | } | |
8252 | sectors = e - s; | |
8253 | } | |
8254 | } | |
8255 | if (sectors && hi < bb->count) { | |
8256 | /* 'hi' points to the first range that starts after 's'. | |
8257 | * Maybe we can merge with the start of that range */ | |
8258 | sector_t a = BB_OFFSET(p[hi]); | |
8259 | sector_t e = a + BB_LEN(p[hi]); | |
8260 | int ack = BB_ACK(p[hi]); | |
8261 | if (a <= s + sectors) { | |
8262 | /* merging is possible */ | |
8263 | if (e <= s + sectors) { | |
8264 | /* full overlap */ | |
8265 | e = s + sectors; | |
8266 | ack = acknowledged; | |
8267 | } else | |
8268 | ack = ack && acknowledged; | |
8269 | ||
8270 | a = s; | |
8271 | if (e - a <= BB_MAX_LEN) { | |
8272 | p[hi] = BB_MAKE(a, e-a, ack); | |
8273 | s = e; | |
8274 | } else { | |
8275 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8276 | s = a + BB_MAX_LEN; | |
8277 | } | |
8278 | sectors = e - s; | |
8279 | lo = hi; | |
8280 | hi++; | |
8281 | } | |
8282 | } | |
8283 | if (sectors == 0 && hi < bb->count) { | |
8284 | /* we might be able to combine lo and hi */ | |
8285 | /* Note: 's' is at the end of 'lo' */ | |
8286 | sector_t a = BB_OFFSET(p[hi]); | |
8287 | int lolen = BB_LEN(p[lo]); | |
8288 | int hilen = BB_LEN(p[hi]); | |
8289 | int newlen = lolen + hilen - (s - a); | |
8290 | if (s >= a && newlen < BB_MAX_LEN) { | |
8291 | /* yes, we can combine them */ | |
8292 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8293 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8294 | memmove(p + hi, p + hi + 1, | |
8295 | (bb->count - hi - 1) * 8); | |
8296 | bb->count--; | |
8297 | } | |
8298 | } | |
8299 | while (sectors) { | |
8300 | /* didn't merge (it all). | |
8301 | * Need to add a range just before 'hi' */ | |
8302 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8303 | /* No room for more */ | |
8304 | rv = 0; | |
8305 | break; | |
8306 | } else { | |
8307 | int this_sectors = sectors; | |
8308 | memmove(p + hi + 1, p + hi, | |
8309 | (bb->count - hi) * 8); | |
8310 | bb->count++; | |
8311 | ||
8312 | if (this_sectors > BB_MAX_LEN) | |
8313 | this_sectors = BB_MAX_LEN; | |
8314 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8315 | sectors -= this_sectors; | |
8316 | s += this_sectors; | |
8317 | } | |
8318 | } | |
8319 | ||
8320 | bb->changed = 1; | |
de393cde N |
8321 | if (!acknowledged) |
8322 | bb->unacked_exist = 1; | |
905b0297 | 8323 | write_sequnlock_irqrestore(&bb->lock, flags); |
2230dfe4 N |
8324 | |
8325 | return rv; | |
8326 | } | |
8327 | ||
3cb03002 | 8328 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8329 | int is_new) |
2230dfe4 | 8330 | { |
c6563a8c N |
8331 | int rv; |
8332 | if (is_new) | |
8333 | s += rdev->new_data_offset; | |
8334 | else | |
8335 | s += rdev->data_offset; | |
8336 | rv = md_set_badblocks(&rdev->badblocks, | |
8337 | s, sectors, 0); | |
2230dfe4 N |
8338 | if (rv) { |
8339 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8340 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 N |
8341 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
8342 | md_wakeup_thread(rdev->mddev->thread); | |
8343 | } | |
8344 | return rv; | |
8345 | } | |
8346 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8347 | ||
8348 | /* | |
8349 | * Remove a range of bad blocks from the table. | |
8350 | * This may involve extending the table if we spilt a region, | |
8351 | * but it must not fail. So if the table becomes full, we just | |
8352 | * drop the remove request. | |
8353 | */ | |
8354 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8355 | { | |
8356 | u64 *p; | |
8357 | int lo, hi; | |
8358 | sector_t target = s + sectors; | |
8359 | int rv = 0; | |
8360 | ||
8361 | if (bb->shift > 0) { | |
8362 | /* When clearing we round the start up and the end down. | |
8363 | * This should not matter as the shift should align with | |
8364 | * the block size and no rounding should ever be needed. | |
8365 | * However it is better the think a block is bad when it | |
8366 | * isn't than to think a block is not bad when it is. | |
8367 | */ | |
8368 | s += (1<<bb->shift) - 1; | |
8369 | s >>= bb->shift; | |
8370 | target >>= bb->shift; | |
8371 | sectors = target - s; | |
8372 | } | |
8373 | ||
8374 | write_seqlock_irq(&bb->lock); | |
8375 | ||
8376 | p = bb->page; | |
8377 | lo = 0; | |
8378 | hi = bb->count; | |
8379 | /* Find the last range that starts before 'target' */ | |
8380 | while (hi - lo > 1) { | |
8381 | int mid = (lo + hi) / 2; | |
8382 | sector_t a = BB_OFFSET(p[mid]); | |
8383 | if (a < target) | |
8384 | lo = mid; | |
8385 | else | |
8386 | hi = mid; | |
8387 | } | |
8388 | if (hi > lo) { | |
8389 | /* p[lo] is the last range that could overlap the | |
8390 | * current range. Earlier ranges could also overlap, | |
8391 | * but only this one can overlap the end of the range. | |
8392 | */ | |
8393 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8394 | /* Partial overlap, leave the tail of this range */ | |
8395 | int ack = BB_ACK(p[lo]); | |
8396 | sector_t a = BB_OFFSET(p[lo]); | |
8397 | sector_t end = a + BB_LEN(p[lo]); | |
8398 | ||
8399 | if (a < s) { | |
8400 | /* we need to split this range */ | |
8401 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8b32bf5e | 8402 | rv = -ENOSPC; |
2230dfe4 N |
8403 | goto out; |
8404 | } | |
8405 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8406 | bb->count++; | |
8407 | p[lo] = BB_MAKE(a, s-a, ack); | |
8408 | lo++; | |
8409 | } | |
8410 | p[lo] = BB_MAKE(target, end - target, ack); | |
8411 | /* there is no longer an overlap */ | |
8412 | hi = lo; | |
8413 | lo--; | |
8414 | } | |
8415 | while (lo >= 0 && | |
8416 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8417 | /* This range does overlap */ | |
8418 | if (BB_OFFSET(p[lo]) < s) { | |
8419 | /* Keep the early parts of this range. */ | |
8420 | int ack = BB_ACK(p[lo]); | |
8421 | sector_t start = BB_OFFSET(p[lo]); | |
8422 | p[lo] = BB_MAKE(start, s - start, ack); | |
8423 | /* now low doesn't overlap, so.. */ | |
8424 | break; | |
8425 | } | |
8426 | lo--; | |
8427 | } | |
8428 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8429 | * anything between needs to be discarded | |
8430 | */ | |
8431 | if (hi - lo > 1) { | |
8432 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8433 | bb->count -= (hi - lo - 1); | |
8434 | } | |
8435 | } | |
8436 | ||
8437 | bb->changed = 1; | |
8438 | out: | |
8439 | write_sequnlock_irq(&bb->lock); | |
8440 | return rv; | |
8441 | } | |
8442 | ||
c6563a8c N |
8443 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8444 | int is_new) | |
2230dfe4 | 8445 | { |
c6563a8c N |
8446 | if (is_new) |
8447 | s += rdev->new_data_offset; | |
8448 | else | |
8449 | s += rdev->data_offset; | |
2230dfe4 | 8450 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8451 | s, sectors); |
2230dfe4 N |
8452 | } |
8453 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8454 | ||
8455 | /* | |
8456 | * Acknowledge all bad blocks in a list. | |
8457 | * This only succeeds if ->changed is clear. It is used by | |
8458 | * in-kernel metadata updates | |
8459 | */ | |
8460 | void md_ack_all_badblocks(struct badblocks *bb) | |
8461 | { | |
8462 | if (bb->page == NULL || bb->changed) | |
8463 | /* no point even trying */ | |
8464 | return; | |
8465 | write_seqlock_irq(&bb->lock); | |
8466 | ||
ecb178bb | 8467 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8468 | u64 *p = bb->page; |
8469 | int i; | |
8470 | for (i = 0; i < bb->count ; i++) { | |
8471 | if (!BB_ACK(p[i])) { | |
8472 | sector_t start = BB_OFFSET(p[i]); | |
8473 | int len = BB_LEN(p[i]); | |
8474 | p[i] = BB_MAKE(start, len, 1); | |
8475 | } | |
8476 | } | |
de393cde | 8477 | bb->unacked_exist = 0; |
2230dfe4 N |
8478 | } |
8479 | write_sequnlock_irq(&bb->lock); | |
8480 | } | |
8481 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8482 | ||
16c791a5 N |
8483 | /* sysfs access to bad-blocks list. |
8484 | * We present two files. | |
8485 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8486 | * are recorded as bad. The list is truncated to fit within | |
8487 | * the one-page limit of sysfs. | |
8488 | * Writing "sector length" to this file adds an acknowledged | |
8489 | * bad block list. | |
8490 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8491 | * been acknowledged. Writing to this file adds bad blocks | |
8492 | * without acknowledging them. This is largely for testing. | |
8493 | */ | |
8494 | ||
8495 | static ssize_t | |
8496 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8497 | { | |
8498 | size_t len; | |
8499 | int i; | |
8500 | u64 *p = bb->page; | |
8501 | unsigned seq; | |
8502 | ||
8503 | if (bb->shift < 0) | |
8504 | return 0; | |
8505 | ||
8506 | retry: | |
8507 | seq = read_seqbegin(&bb->lock); | |
8508 | ||
8509 | len = 0; | |
8510 | i = 0; | |
8511 | ||
8512 | while (len < PAGE_SIZE && i < bb->count) { | |
8513 | sector_t s = BB_OFFSET(p[i]); | |
8514 | unsigned int length = BB_LEN(p[i]); | |
8515 | int ack = BB_ACK(p[i]); | |
8516 | i++; | |
8517 | ||
8518 | if (unack && ack) | |
8519 | continue; | |
8520 | ||
8521 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8522 | (unsigned long long)s << bb->shift, | |
8523 | length << bb->shift); | |
8524 | } | |
de393cde N |
8525 | if (unack && len == 0) |
8526 | bb->unacked_exist = 0; | |
16c791a5 N |
8527 | |
8528 | if (read_seqretry(&bb->lock, seq)) | |
8529 | goto retry; | |
8530 | ||
8531 | return len; | |
8532 | } | |
8533 | ||
8534 | #define DO_DEBUG 1 | |
8535 | ||
8536 | static ssize_t | |
8537 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8538 | { | |
8539 | unsigned long long sector; | |
8540 | int length; | |
8541 | char newline; | |
8542 | #ifdef DO_DEBUG | |
8543 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8544 | * Normally only a successful write may clear a badblock | |
8545 | */ | |
8546 | int clear = 0; | |
8547 | if (page[0] == '-') { | |
8548 | clear = 1; | |
8549 | page++; | |
8550 | } | |
8551 | #endif /* DO_DEBUG */ | |
8552 | ||
8553 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8554 | case 3: | |
8555 | if (newline != '\n') | |
8556 | return -EINVAL; | |
8557 | case 2: | |
8558 | if (length <= 0) | |
8559 | return -EINVAL; | |
8560 | break; | |
8561 | default: | |
8562 | return -EINVAL; | |
8563 | } | |
8564 | ||
8565 | #ifdef DO_DEBUG | |
8566 | if (clear) { | |
8567 | md_clear_badblocks(bb, sector, length); | |
8568 | return len; | |
8569 | } | |
8570 | #endif /* DO_DEBUG */ | |
8571 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8572 | return len; | |
8573 | else | |
8574 | return -ENOSPC; | |
8575 | } | |
8576 | ||
75c96f85 AB |
8577 | static int md_notify_reboot(struct notifier_block *this, |
8578 | unsigned long code, void *x) | |
1da177e4 LT |
8579 | { |
8580 | struct list_head *tmp; | |
fd01b88c | 8581 | struct mddev *mddev; |
2dba6a91 | 8582 | int need_delay = 0; |
1da177e4 | 8583 | |
c744a65c N |
8584 | for_each_mddev(mddev, tmp) { |
8585 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8586 | if (mddev->pers) |
8587 | __md_stop_writes(mddev); | |
0f62fb22 N |
8588 | if (mddev->persistent) |
8589 | mddev->safemode = 2; | |
c744a65c | 8590 | mddev_unlock(mddev); |
2dba6a91 | 8591 | } |
c744a65c | 8592 | need_delay = 1; |
1da177e4 | 8593 | } |
c744a65c N |
8594 | /* |
8595 | * certain more exotic SCSI devices are known to be | |
8596 | * volatile wrt too early system reboots. While the | |
8597 | * right place to handle this issue is the given | |
8598 | * driver, we do want to have a safe RAID driver ... | |
8599 | */ | |
8600 | if (need_delay) | |
8601 | mdelay(1000*1); | |
8602 | ||
1da177e4 LT |
8603 | return NOTIFY_DONE; |
8604 | } | |
8605 | ||
75c96f85 | 8606 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8607 | .notifier_call = md_notify_reboot, |
8608 | .next = NULL, | |
8609 | .priority = INT_MAX, /* before any real devices */ | |
8610 | }; | |
8611 | ||
8612 | static void md_geninit(void) | |
8613 | { | |
36a4e1fe | 8614 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8615 | |
c7705f34 | 8616 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8617 | } |
8618 | ||
75c96f85 | 8619 | static int __init md_init(void) |
1da177e4 | 8620 | { |
e804ac78 TH |
8621 | int ret = -ENOMEM; |
8622 | ||
ada609ee | 8623 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8624 | if (!md_wq) |
8625 | goto err_wq; | |
8626 | ||
8627 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8628 | if (!md_misc_wq) | |
8629 | goto err_misc_wq; | |
8630 | ||
8631 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8632 | goto err_md; | |
8633 | ||
8634 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8635 | goto err_mdp; | |
8636 | mdp_major = ret; | |
8637 | ||
af5628f0 | 8638 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
8639 | md_probe, NULL, NULL); |
8640 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8641 | md_probe, NULL, NULL); |
8642 | ||
1da177e4 | 8643 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8644 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8645 | |
8646 | md_geninit(); | |
d710e138 | 8647 | return 0; |
1da177e4 | 8648 | |
e804ac78 TH |
8649 | err_mdp: |
8650 | unregister_blkdev(MD_MAJOR, "md"); | |
8651 | err_md: | |
8652 | destroy_workqueue(md_misc_wq); | |
8653 | err_misc_wq: | |
8654 | destroy_workqueue(md_wq); | |
8655 | err_wq: | |
8656 | return ret; | |
8657 | } | |
1da177e4 LT |
8658 | |
8659 | #ifndef MODULE | |
8660 | ||
8661 | /* | |
8662 | * Searches all registered partitions for autorun RAID arrays | |
8663 | * at boot time. | |
8664 | */ | |
4d936ec1 ME |
8665 | |
8666 | static LIST_HEAD(all_detected_devices); | |
8667 | struct detected_devices_node { | |
8668 | struct list_head list; | |
8669 | dev_t dev; | |
8670 | }; | |
1da177e4 LT |
8671 | |
8672 | void md_autodetect_dev(dev_t dev) | |
8673 | { | |
4d936ec1 ME |
8674 | struct detected_devices_node *node_detected_dev; |
8675 | ||
8676 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8677 | if (node_detected_dev) { | |
8678 | node_detected_dev->dev = dev; | |
8679 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8680 | } else { | |
8681 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8682 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8683 | } | |
1da177e4 LT |
8684 | } |
8685 | ||
1da177e4 LT |
8686 | static void autostart_arrays(int part) |
8687 | { | |
3cb03002 | 8688 | struct md_rdev *rdev; |
4d936ec1 ME |
8689 | struct detected_devices_node *node_detected_dev; |
8690 | dev_t dev; | |
8691 | int i_scanned, i_passed; | |
1da177e4 | 8692 | |
4d936ec1 ME |
8693 | i_scanned = 0; |
8694 | i_passed = 0; | |
1da177e4 | 8695 | |
4d936ec1 | 8696 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8697 | |
4d936ec1 ME |
8698 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8699 | i_scanned++; | |
8700 | node_detected_dev = list_entry(all_detected_devices.next, | |
8701 | struct detected_devices_node, list); | |
8702 | list_del(&node_detected_dev->list); | |
8703 | dev = node_detected_dev->dev; | |
8704 | kfree(node_detected_dev); | |
df968c4e | 8705 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8706 | if (IS_ERR(rdev)) |
8707 | continue; | |
8708 | ||
403df478 | 8709 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 8710 | continue; |
403df478 | 8711 | |
d0fae18f | 8712 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8713 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8714 | i_passed++; |
1da177e4 | 8715 | } |
4d936ec1 ME |
8716 | |
8717 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8718 | i_scanned, i_passed); | |
1da177e4 LT |
8719 | |
8720 | autorun_devices(part); | |
8721 | } | |
8722 | ||
fdee8ae4 | 8723 | #endif /* !MODULE */ |
1da177e4 LT |
8724 | |
8725 | static __exit void md_exit(void) | |
8726 | { | |
fd01b88c | 8727 | struct mddev *mddev; |
1da177e4 | 8728 | struct list_head *tmp; |
e2f23b60 | 8729 | int delay = 1; |
8ab5e4c1 | 8730 | |
af5628f0 | 8731 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 8732 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8733 | |
3dbd8c2e | 8734 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8735 | unregister_blkdev(mdp_major, "mdp"); |
8736 | unregister_reboot_notifier(&md_notifier); | |
8737 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
8738 | |
8739 | /* We cannot unload the modules while some process is | |
8740 | * waiting for us in select() or poll() - wake them up | |
8741 | */ | |
8742 | md_unloading = 1; | |
8743 | while (waitqueue_active(&md_event_waiters)) { | |
8744 | /* not safe to leave yet */ | |
8745 | wake_up(&md_event_waiters); | |
8746 | msleep(delay); | |
8747 | delay += delay; | |
8748 | } | |
1da177e4 | 8749 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 8750 | |
29ac4aa3 | 8751 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8752 | export_array(mddev); |
d3374825 | 8753 | mddev->hold_active = 0; |
1da177e4 | 8754 | } |
e804ac78 TH |
8755 | destroy_workqueue(md_misc_wq); |
8756 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8757 | } |
8758 | ||
685784aa | 8759 | subsys_initcall(md_init); |
1da177e4 LT |
8760 | module_exit(md_exit) |
8761 | ||
f91de92e N |
8762 | static int get_ro(char *buffer, struct kernel_param *kp) |
8763 | { | |
8764 | return sprintf(buffer, "%d", start_readonly); | |
8765 | } | |
8766 | static int set_ro(const char *val, struct kernel_param *kp) | |
8767 | { | |
8768 | char *e; | |
8769 | int num = simple_strtoul(val, &e, 10); | |
8770 | if (*val && (*e == '\0' || *e == '\n')) { | |
8771 | start_readonly = num; | |
4dbcdc75 | 8772 | return 0; |
f91de92e N |
8773 | } |
8774 | return -EINVAL; | |
8775 | } | |
8776 | ||
80ca3a44 N |
8777 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8778 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 8779 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8780 | |
1da177e4 | 8781 | MODULE_LICENSE("GPL"); |
0efb9e61 | 8782 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8783 | MODULE_ALIAS("md"); |
72008652 | 8784 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |