Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
f72ffdd6 | 3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar |
1da177e4 LT |
4 | |
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
ff01bb48 | 39 | #include <linux/fs.h> |
d7603b7e | 40 | #include <linux/poll.h> |
16f17b39 | 41 | #include <linux/ctype.h> |
e7d2860b | 42 | #include <linux/string.h> |
fb4d8c76 N |
43 | #include <linux/hdreg.h> |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/random.h> | |
056075c7 | 46 | #include <linux/module.h> |
fb4d8c76 | 47 | #include <linux/reboot.h> |
32a7627c | 48 | #include <linux/file.h> |
aa98aa31 | 49 | #include <linux/compat.h> |
25570727 | 50 | #include <linux/delay.h> |
bff61975 N |
51 | #include <linux/raid/md_p.h> |
52 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
43b2e5d8 | 54 | #include "md.h" |
ef740c37 | 55 | #include "bitmap.h" |
1da177e4 | 56 | |
1da177e4 | 57 | #ifndef MODULE |
d710e138 | 58 | static void autostart_arrays(int part); |
1da177e4 LT |
59 | #endif |
60 | ||
01f96c0a N |
61 | /* pers_list is a list of registered personalities protected |
62 | * by pers_lock. | |
63 | * pers_lock does extra service to protect accesses to | |
64 | * mddev->thread when the mutex cannot be held. | |
65 | */ | |
2604b703 | 66 | static LIST_HEAD(pers_list); |
1da177e4 LT |
67 | static DEFINE_SPINLOCK(pers_lock); |
68 | ||
90b08710 | 69 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
70 | static struct workqueue_struct *md_wq; |
71 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 72 | |
746d3207 N |
73 | static int remove_and_add_spares(struct mddev *mddev, |
74 | struct md_rdev *this); | |
75 | ||
1e50915f RB |
76 | /* |
77 | * Default number of read corrections we'll attempt on an rdev | |
78 | * before ejecting it from the array. We divide the read error | |
79 | * count by 2 for every hour elapsed between read errors. | |
80 | */ | |
81 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
82 | /* |
83 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
84 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
85 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 86 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
87 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
88 | * speed limit - in case reconstruction slows down your system despite | |
89 | * idle IO detection. | |
90 | * | |
91 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 92 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
93 | */ |
94 | ||
95 | static int sysctl_speed_limit_min = 1000; | |
96 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 97 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
98 | { |
99 | return mddev->sync_speed_min ? | |
100 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
101 | } | |
102 | ||
fd01b88c | 103 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
104 | { |
105 | return mddev->sync_speed_max ? | |
106 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
107 | } | |
1da177e4 LT |
108 | |
109 | static struct ctl_table_header *raid_table_header; | |
110 | ||
82592c38 | 111 | static struct ctl_table raid_table[] = { |
1da177e4 | 112 | { |
1da177e4 LT |
113 | .procname = "speed_limit_min", |
114 | .data = &sysctl_speed_limit_min, | |
115 | .maxlen = sizeof(int), | |
80ca3a44 | 116 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 117 | .proc_handler = proc_dointvec, |
1da177e4 LT |
118 | }, |
119 | { | |
1da177e4 LT |
120 | .procname = "speed_limit_max", |
121 | .data = &sysctl_speed_limit_max, | |
122 | .maxlen = sizeof(int), | |
80ca3a44 | 123 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 124 | .proc_handler = proc_dointvec, |
1da177e4 | 125 | }, |
894d2491 | 126 | { } |
1da177e4 LT |
127 | }; |
128 | ||
82592c38 | 129 | static struct ctl_table raid_dir_table[] = { |
1da177e4 | 130 | { |
1da177e4 LT |
131 | .procname = "raid", |
132 | .maxlen = 0, | |
80ca3a44 | 133 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
134 | .child = raid_table, |
135 | }, | |
894d2491 | 136 | { } |
1da177e4 LT |
137 | }; |
138 | ||
82592c38 | 139 | static struct ctl_table raid_root_table[] = { |
1da177e4 | 140 | { |
1da177e4 LT |
141 | .procname = "dev", |
142 | .maxlen = 0, | |
143 | .mode = 0555, | |
144 | .child = raid_dir_table, | |
145 | }, | |
894d2491 | 146 | { } |
1da177e4 LT |
147 | }; |
148 | ||
83d5cde4 | 149 | static const struct block_device_operations md_fops; |
1da177e4 | 150 | |
f91de92e N |
151 | static int start_readonly; |
152 | ||
a167f663 N |
153 | /* bio_clone_mddev |
154 | * like bio_clone, but with a local bio set | |
155 | */ | |
156 | ||
a167f663 | 157 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 158 | struct mddev *mddev) |
a167f663 N |
159 | { |
160 | struct bio *b; | |
a167f663 N |
161 | |
162 | if (!mddev || !mddev->bio_set) | |
163 | return bio_alloc(gfp_mask, nr_iovecs); | |
164 | ||
395c72a7 | 165 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
166 | if (!b) |
167 | return NULL; | |
a167f663 N |
168 | return b; |
169 | } | |
170 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
171 | ||
172 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 173 | struct mddev *mddev) |
a167f663 | 174 | { |
a167f663 N |
175 | if (!mddev || !mddev->bio_set) |
176 | return bio_clone(bio, gfp_mask); | |
177 | ||
bf800ef1 | 178 | return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
a167f663 N |
179 | } |
180 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
181 | ||
d7603b7e N |
182 | /* |
183 | * We have a system wide 'event count' that is incremented | |
184 | * on any 'interesting' event, and readers of /proc/mdstat | |
185 | * can use 'poll' or 'select' to find out when the event | |
186 | * count increases. | |
187 | * | |
188 | * Events are: | |
189 | * start array, stop array, error, add device, remove device, | |
190 | * start build, activate spare | |
191 | */ | |
2989ddbd | 192 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 193 | static atomic_t md_event_count; |
fd01b88c | 194 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
195 | { |
196 | atomic_inc(&md_event_count); | |
197 | wake_up(&md_event_waiters); | |
198 | } | |
29269553 | 199 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 200 | |
c331eb04 N |
201 | /* Alternate version that can be called from interrupts |
202 | * when calling sysfs_notify isn't needed. | |
203 | */ | |
fd01b88c | 204 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
205 | { |
206 | atomic_inc(&md_event_count); | |
207 | wake_up(&md_event_waiters); | |
208 | } | |
209 | ||
1da177e4 LT |
210 | /* |
211 | * Enables to iterate over all existing md arrays | |
212 | * all_mddevs_lock protects this list. | |
213 | */ | |
214 | static LIST_HEAD(all_mddevs); | |
215 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
216 | ||
1da177e4 LT |
217 | /* |
218 | * iterates through all used mddevs in the system. | |
219 | * We take care to grab the all_mddevs_lock whenever navigating | |
220 | * the list, and to always hold a refcount when unlocked. | |
221 | * Any code which breaks out of this loop while own | |
222 | * a reference to the current mddev and must mddev_put it. | |
223 | */ | |
fd01b88c | 224 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 | 225 | \ |
f72ffdd6 | 226 | for (({ spin_lock(&all_mddevs_lock); \ |
fd01b88c N |
227 | _tmp = all_mddevs.next; \ |
228 | _mddev = NULL;}); \ | |
229 | ({ if (_tmp != &all_mddevs) \ | |
230 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 231 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
232 | if (_mddev) mddev_put(_mddev); \ |
233 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
234 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 235 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 236 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
237 | ) |
238 | ||
409c57f3 N |
239 | /* Rather than calling directly into the personality make_request function, |
240 | * IO requests come here first so that we can check if the device is | |
241 | * being suspended pending a reconfiguration. | |
242 | * We hold a refcount over the call to ->make_request. By the time that | |
243 | * call has finished, the bio has been linked into some internal structure | |
244 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
245 | */ | |
5a7bbad2 | 246 | static void md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 247 | { |
49077326 | 248 | const int rw = bio_data_dir(bio); |
fd01b88c | 249 | struct mddev *mddev = q->queuedata; |
e91ece55 | 250 | unsigned int sectors; |
49077326 | 251 | |
0ca69886 N |
252 | if (mddev == NULL || mddev->pers == NULL |
253 | || !mddev->ready) { | |
409c57f3 | 254 | bio_io_error(bio); |
5a7bbad2 | 255 | return; |
409c57f3 | 256 | } |
bbfa57c0 SR |
257 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
258 | bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS); | |
259 | return; | |
260 | } | |
0ca69886 | 261 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 262 | rcu_read_lock(); |
e9c7469b | 263 | if (mddev->suspended) { |
409c57f3 N |
264 | DEFINE_WAIT(__wait); |
265 | for (;;) { | |
266 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
267 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 268 | if (!mddev->suspended) |
409c57f3 N |
269 | break; |
270 | rcu_read_unlock(); | |
271 | schedule(); | |
272 | rcu_read_lock(); | |
273 | } | |
274 | finish_wait(&mddev->sb_wait, &__wait); | |
275 | } | |
276 | atomic_inc(&mddev->active_io); | |
277 | rcu_read_unlock(); | |
49077326 | 278 | |
e91ece55 CM |
279 | /* |
280 | * save the sectors now since our bio can | |
281 | * go away inside make_request | |
282 | */ | |
283 | sectors = bio_sectors(bio); | |
5a7bbad2 | 284 | mddev->pers->make_request(mddev, bio); |
49077326 | 285 | |
18c0b223 | 286 | generic_start_io_acct(rw, sectors, &mddev->gendisk->part0); |
49077326 | 287 | |
409c57f3 N |
288 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
289 | wake_up(&mddev->sb_wait); | |
409c57f3 N |
290 | } |
291 | ||
9e35b99c N |
292 | /* mddev_suspend makes sure no new requests are submitted |
293 | * to the device, and that any requests that have been submitted | |
294 | * are completely handled. | |
295 | * Once ->stop is called and completes, the module will be completely | |
296 | * unused. | |
297 | */ | |
fd01b88c | 298 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
299 | { |
300 | BUG_ON(mddev->suspended); | |
301 | mddev->suspended = 1; | |
302 | synchronize_rcu(); | |
303 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
304 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
305 | |
306 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 307 | } |
390ee602 | 308 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 309 | |
fd01b88c | 310 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
311 | { |
312 | mddev->suspended = 0; | |
313 | wake_up(&mddev->sb_wait); | |
314 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 315 | |
47525e59 | 316 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
317 | md_wakeup_thread(mddev->thread); |
318 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 319 | } |
390ee602 | 320 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 321 | |
fd01b88c | 322 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 | 323 | { |
5c675f83 N |
324 | struct md_personality *pers = mddev->pers; |
325 | int ret = 0; | |
326 | ||
327 | rcu_read_lock(); | |
328 | if (mddev->suspended) | |
329 | ret = 1; | |
330 | else if (pers && pers->congested) | |
331 | ret = pers->congested(mddev, bits); | |
332 | rcu_read_unlock(); | |
333 | return ret; | |
334 | } | |
335 | EXPORT_SYMBOL_GPL(mddev_congested); | |
336 | static int md_congested(void *data, int bits) | |
337 | { | |
338 | struct mddev *mddev = data; | |
339 | return mddev_congested(mddev, bits); | |
3fa841d7 | 340 | } |
3fa841d7 | 341 | |
a2826aa9 | 342 | /* |
e9c7469b | 343 | * Generic flush handling for md |
a2826aa9 N |
344 | */ |
345 | ||
e9c7469b | 346 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 | 347 | { |
3cb03002 | 348 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 349 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
350 | |
351 | rdev_dec_pending(rdev, mddev); | |
352 | ||
353 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 354 | /* The pre-request flush has finished */ |
e804ac78 | 355 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
356 | } |
357 | bio_put(bio); | |
358 | } | |
359 | ||
a7a07e69 N |
360 | static void md_submit_flush_data(struct work_struct *ws); |
361 | ||
a035fc3e | 362 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 363 | { |
fd01b88c | 364 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 365 | struct md_rdev *rdev; |
a2826aa9 | 366 | |
a7a07e69 N |
367 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
368 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 369 | rcu_read_lock(); |
dafb20fa | 370 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
371 | if (rdev->raid_disk >= 0 && |
372 | !test_bit(Faulty, &rdev->flags)) { | |
373 | /* Take two references, one is dropped | |
374 | * when request finishes, one after | |
375 | * we reclaim rcu_read_lock | |
376 | */ | |
377 | struct bio *bi; | |
378 | atomic_inc(&rdev->nr_pending); | |
379 | atomic_inc(&rdev->nr_pending); | |
380 | rcu_read_unlock(); | |
b5e1b8ce | 381 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 382 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
383 | bi->bi_private = rdev; |
384 | bi->bi_bdev = rdev->bdev; | |
385 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 386 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
387 | rcu_read_lock(); |
388 | rdev_dec_pending(rdev, mddev); | |
389 | } | |
390 | rcu_read_unlock(); | |
a7a07e69 N |
391 | if (atomic_dec_and_test(&mddev->flush_pending)) |
392 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
393 | } |
394 | ||
e9c7469b | 395 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 396 | { |
fd01b88c | 397 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 398 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 399 | |
4f024f37 | 400 | if (bio->bi_iter.bi_size == 0) |
a2826aa9 N |
401 | /* an empty barrier - all done */ |
402 | bio_endio(bio, 0); | |
403 | else { | |
e9c7469b | 404 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 405 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 406 | } |
2b74e12e N |
407 | |
408 | mddev->flush_bio = NULL; | |
409 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
410 | } |
411 | ||
fd01b88c | 412 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 | 413 | { |
85572d7c | 414 | spin_lock_irq(&mddev->lock); |
a2826aa9 | 415 | wait_event_lock_irq(mddev->sb_wait, |
e9c7469b | 416 | !mddev->flush_bio, |
85572d7c | 417 | mddev->lock); |
e9c7469b | 418 | mddev->flush_bio = bio; |
85572d7c | 419 | spin_unlock_irq(&mddev->lock); |
a2826aa9 | 420 | |
a035fc3e N |
421 | INIT_WORK(&mddev->flush_work, submit_flushes); |
422 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 423 | } |
e9c7469b | 424 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 425 | |
74018dc3 | 426 | void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
97658cdd | 427 | { |
9cbb1750 N |
428 | struct mddev *mddev = cb->data; |
429 | md_wakeup_thread(mddev->thread); | |
430 | kfree(cb); | |
97658cdd | 431 | } |
9cbb1750 | 432 | EXPORT_SYMBOL(md_unplug); |
2ac87401 | 433 | |
fd01b88c | 434 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
435 | { |
436 | atomic_inc(&mddev->active); | |
437 | return mddev; | |
438 | } | |
439 | ||
5fd3a17e | 440 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 441 | |
fd01b88c | 442 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 443 | { |
a167f663 N |
444 | struct bio_set *bs = NULL; |
445 | ||
1da177e4 LT |
446 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
447 | return; | |
d3374825 | 448 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
449 | mddev->ctime == 0 && !mddev->hold_active) { |
450 | /* Array is not configured at all, and not held active, | |
451 | * so destroy it */ | |
af8a2434 | 452 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
453 | bs = mddev->bio_set; |
454 | mddev->bio_set = NULL; | |
d3374825 | 455 | if (mddev->gendisk) { |
e804ac78 TH |
456 | /* We did a probe so need to clean up. Call |
457 | * queue_work inside the spinlock so that | |
458 | * flush_workqueue() after mddev_find will | |
459 | * succeed in waiting for the work to be done. | |
d3374825 N |
460 | */ |
461 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 462 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
463 | } else |
464 | kfree(mddev); | |
465 | } | |
466 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
467 | if (bs) |
468 | bioset_free(bs); | |
1da177e4 LT |
469 | } |
470 | ||
fd01b88c | 471 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
472 | { |
473 | mutex_init(&mddev->open_mutex); | |
474 | mutex_init(&mddev->reconfig_mutex); | |
475 | mutex_init(&mddev->bitmap_info.mutex); | |
476 | INIT_LIST_HEAD(&mddev->disks); | |
477 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
478 | init_timer(&mddev->safemode_timer); | |
479 | atomic_set(&mddev->active, 1); | |
480 | atomic_set(&mddev->openers, 0); | |
481 | atomic_set(&mddev->active_io, 0); | |
85572d7c | 482 | spin_lock_init(&mddev->lock); |
fafd7fb0 N |
483 | atomic_set(&mddev->flush_pending, 0); |
484 | init_waitqueue_head(&mddev->sb_wait); | |
485 | init_waitqueue_head(&mddev->recovery_wait); | |
486 | mddev->reshape_position = MaxSector; | |
2c810cdd | 487 | mddev->reshape_backwards = 0; |
c4a39551 | 488 | mddev->last_sync_action = "none"; |
fafd7fb0 N |
489 | mddev->resync_min = 0; |
490 | mddev->resync_max = MaxSector; | |
491 | mddev->level = LEVEL_NONE; | |
492 | } | |
390ee602 | 493 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 494 | |
f72ffdd6 | 495 | static struct mddev *mddev_find(dev_t unit) |
1da177e4 | 496 | { |
fd01b88c | 497 | struct mddev *mddev, *new = NULL; |
1da177e4 | 498 | |
8f5f02c4 N |
499 | if (unit && MAJOR(unit) != MD_MAJOR) |
500 | unit &= ~((1<<MdpMinorShift)-1); | |
501 | ||
1da177e4 LT |
502 | retry: |
503 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
504 | |
505 | if (unit) { | |
506 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
507 | if (mddev->unit == unit) { | |
508 | mddev_get(mddev); | |
509 | spin_unlock(&all_mddevs_lock); | |
510 | kfree(new); | |
511 | return mddev; | |
512 | } | |
513 | ||
514 | if (new) { | |
515 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 516 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
517 | new->hold_active = UNTIL_IOCTL; |
518 | return new; | |
1da177e4 | 519 | } |
efeb53c0 N |
520 | } else if (new) { |
521 | /* find an unused unit number */ | |
522 | static int next_minor = 512; | |
523 | int start = next_minor; | |
524 | int is_free = 0; | |
525 | int dev = 0; | |
526 | while (!is_free) { | |
527 | dev = MKDEV(MD_MAJOR, next_minor); | |
528 | next_minor++; | |
529 | if (next_minor > MINORMASK) | |
530 | next_minor = 0; | |
531 | if (next_minor == start) { | |
532 | /* Oh dear, all in use. */ | |
533 | spin_unlock(&all_mddevs_lock); | |
534 | kfree(new); | |
535 | return NULL; | |
536 | } | |
f72ffdd6 | 537 | |
efeb53c0 N |
538 | is_free = 1; |
539 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
540 | if (mddev->unit == dev) { | |
541 | is_free = 0; | |
542 | break; | |
543 | } | |
544 | } | |
545 | new->unit = dev; | |
546 | new->md_minor = MINOR(dev); | |
547 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
548 | list_add(&new->all_mddevs, &all_mddevs); |
549 | spin_unlock(&all_mddevs_lock); | |
550 | return new; | |
551 | } | |
552 | spin_unlock(&all_mddevs_lock); | |
553 | ||
9ffae0cf | 554 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
555 | if (!new) |
556 | return NULL; | |
557 | ||
1da177e4 LT |
558 | new->unit = unit; |
559 | if (MAJOR(unit) == MD_MAJOR) | |
560 | new->md_minor = MINOR(unit); | |
561 | else | |
562 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
563 | ||
fafd7fb0 | 564 | mddev_init(new); |
1da177e4 | 565 | |
1da177e4 LT |
566 | goto retry; |
567 | } | |
568 | ||
f72ffdd6 | 569 | static inline int __must_check mddev_lock(struct mddev *mddev) |
1da177e4 | 570 | { |
df5b89b3 | 571 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
572 | } |
573 | ||
29f097c4 N |
574 | /* Sometimes we need to take the lock in a situation where |
575 | * failure due to interrupts is not acceptable. | |
576 | */ | |
f72ffdd6 | 577 | static inline void mddev_lock_nointr(struct mddev *mddev) |
29f097c4 N |
578 | { |
579 | mutex_lock(&mddev->reconfig_mutex); | |
580 | } | |
581 | ||
fd01b88c | 582 | static inline int mddev_is_locked(struct mddev *mddev) |
b522adcd DW |
583 | { |
584 | return mutex_is_locked(&mddev->reconfig_mutex); | |
585 | } | |
586 | ||
f72ffdd6 | 587 | static inline int mddev_trylock(struct mddev *mddev) |
1da177e4 | 588 | { |
df5b89b3 | 589 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
590 | } |
591 | ||
b6eb127d N |
592 | static struct attribute_group md_redundancy_group; |
593 | ||
f72ffdd6 | 594 | static void mddev_unlock(struct mddev *mddev) |
1da177e4 | 595 | { |
a64c876f | 596 | if (mddev->to_remove) { |
b6eb127d N |
597 | /* These cannot be removed under reconfig_mutex as |
598 | * an access to the files will try to take reconfig_mutex | |
599 | * while holding the file unremovable, which leads to | |
600 | * a deadlock. | |
bb4f1e9d N |
601 | * So hold set sysfs_active while the remove in happeing, |
602 | * and anything else which might set ->to_remove or my | |
603 | * otherwise change the sysfs namespace will fail with | |
604 | * -EBUSY if sysfs_active is still set. | |
605 | * We set sysfs_active under reconfig_mutex and elsewhere | |
606 | * test it under the same mutex to ensure its correct value | |
607 | * is seen. | |
b6eb127d | 608 | */ |
a64c876f N |
609 | struct attribute_group *to_remove = mddev->to_remove; |
610 | mddev->to_remove = NULL; | |
bb4f1e9d | 611 | mddev->sysfs_active = 1; |
b6eb127d N |
612 | mutex_unlock(&mddev->reconfig_mutex); |
613 | ||
00bcb4ac N |
614 | if (mddev->kobj.sd) { |
615 | if (to_remove != &md_redundancy_group) | |
616 | sysfs_remove_group(&mddev->kobj, to_remove); | |
617 | if (mddev->pers == NULL || | |
618 | mddev->pers->sync_request == NULL) { | |
619 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
620 | if (mddev->sysfs_action) | |
621 | sysfs_put(mddev->sysfs_action); | |
622 | mddev->sysfs_action = NULL; | |
623 | } | |
a64c876f | 624 | } |
bb4f1e9d | 625 | mddev->sysfs_active = 0; |
b6eb127d N |
626 | } else |
627 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 628 | |
751e67ca CD |
629 | /* As we've dropped the mutex we need a spinlock to |
630 | * make sure the thread doesn't disappear | |
01f96c0a N |
631 | */ |
632 | spin_lock(&pers_lock); | |
005eca5e | 633 | md_wakeup_thread(mddev->thread); |
01f96c0a | 634 | spin_unlock(&pers_lock); |
1da177e4 LT |
635 | } |
636 | ||
1ca69c4b N |
637 | static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr) |
638 | { | |
639 | struct md_rdev *rdev; | |
640 | ||
641 | rdev_for_each_rcu(rdev, mddev) | |
642 | if (rdev->desc_nr == nr) | |
643 | return rdev; | |
644 | ||
645 | return NULL; | |
646 | } | |
647 | ||
648 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 649 | { |
3cb03002 | 650 | struct md_rdev *rdev; |
1da177e4 | 651 | |
dafb20fa | 652 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
653 | if (rdev->bdev->bd_dev == dev) |
654 | return rdev; | |
159ec1fc | 655 | |
1da177e4 LT |
656 | return NULL; |
657 | } | |
658 | ||
1ca69c4b N |
659 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
660 | { | |
661 | struct md_rdev *rdev; | |
662 | ||
663 | rdev_for_each_rcu(rdev, mddev) | |
664 | if (rdev->bdev->bd_dev == dev) | |
665 | return rdev; | |
666 | ||
667 | return NULL; | |
668 | } | |
669 | ||
84fc4b56 | 670 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 671 | { |
84fc4b56 | 672 | struct md_personality *pers; |
d9d166c2 N |
673 | list_for_each_entry(pers, &pers_list, list) { |
674 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 675 | return pers; |
d9d166c2 N |
676 | if (strcmp(pers->name, clevel)==0) |
677 | return pers; | |
678 | } | |
2604b703 N |
679 | return NULL; |
680 | } | |
681 | ||
b73df2d3 | 682 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 683 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 684 | { |
57b2caa3 | 685 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 686 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
687 | } |
688 | ||
f72ffdd6 | 689 | static int alloc_disk_sb(struct md_rdev *rdev) |
1da177e4 | 690 | { |
1da177e4 LT |
691 | rdev->sb_page = alloc_page(GFP_KERNEL); |
692 | if (!rdev->sb_page) { | |
693 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 694 | return -ENOMEM; |
1da177e4 LT |
695 | } |
696 | ||
697 | return 0; | |
698 | } | |
699 | ||
545c8795 | 700 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
701 | { |
702 | if (rdev->sb_page) { | |
2d1f3b5d | 703 | put_page(rdev->sb_page); |
1da177e4 LT |
704 | rdev->sb_loaded = 0; |
705 | rdev->sb_page = NULL; | |
0f420358 | 706 | rdev->sb_start = 0; |
dd8ac336 | 707 | rdev->sectors = 0; |
1da177e4 | 708 | } |
2699b672 N |
709 | if (rdev->bb_page) { |
710 | put_page(rdev->bb_page); | |
711 | rdev->bb_page = NULL; | |
712 | } | |
4fa2f327 N |
713 | kfree(rdev->badblocks.page); |
714 | rdev->badblocks.page = NULL; | |
1da177e4 | 715 | } |
545c8795 | 716 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 717 | |
6712ecf8 | 718 | static void super_written(struct bio *bio, int error) |
7bfa19f2 | 719 | { |
3cb03002 | 720 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 721 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 722 | |
3a0f5bbb N |
723 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
724 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
725 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
726 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 727 | md_error(mddev, rdev); |
3a0f5bbb | 728 | } |
7bfa19f2 | 729 | |
a9701a30 N |
730 | if (atomic_dec_and_test(&mddev->pending_writes)) |
731 | wake_up(&mddev->sb_wait); | |
f8b58edf | 732 | bio_put(bio); |
7bfa19f2 N |
733 | } |
734 | ||
fd01b88c | 735 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
736 | sector_t sector, int size, struct page *page) |
737 | { | |
738 | /* write first size bytes of page to sector of rdev | |
739 | * Increment mddev->pending_writes before returning | |
740 | * and decrement it on completion, waking up sb_wait | |
741 | * if zero is reached. | |
742 | * If an error occurred, call md_error | |
743 | */ | |
a167f663 | 744 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 745 | |
a6ff7e08 | 746 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
4f024f37 | 747 | bio->bi_iter.bi_sector = sector; |
7bfa19f2 N |
748 | bio_add_page(bio, page, size, 0); |
749 | bio->bi_private = rdev; | |
750 | bio->bi_end_io = super_written; | |
a9701a30 | 751 | |
7bfa19f2 | 752 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 753 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
754 | } |
755 | ||
fd01b88c | 756 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 757 | { |
e9c7469b | 758 | /* wait for all superblock writes that were scheduled to complete */ |
1967cd56 | 759 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
7bfa19f2 N |
760 | } |
761 | ||
3cb03002 | 762 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 763 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 764 | { |
a167f663 | 765 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
766 | int ret; |
767 | ||
a6ff7e08 JB |
768 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
769 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 | 770 | if (metadata_op) |
4f024f37 | 771 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
1fdd6fc9 N |
772 | else if (rdev->mddev->reshape_position != MaxSector && |
773 | (rdev->mddev->reshape_backwards == | |
774 | (sector >= rdev->mddev->reshape_position))) | |
4f024f37 | 775 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
ccebd4c4 | 776 | else |
4f024f37 | 777 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
1da177e4 | 778 | bio_add_page(bio, page, size, 0); |
c170bbb4 | 779 | submit_bio_wait(rw, bio); |
1da177e4 LT |
780 | |
781 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
782 | bio_put(bio); | |
783 | return ret; | |
784 | } | |
a8745db2 | 785 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 786 | |
f72ffdd6 | 787 | static int read_disk_sb(struct md_rdev *rdev, int size) |
1da177e4 LT |
788 | { |
789 | char b[BDEVNAME_SIZE]; | |
403df478 | 790 | |
1da177e4 LT |
791 | if (rdev->sb_loaded) |
792 | return 0; | |
793 | ||
ccebd4c4 | 794 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
795 | goto fail; |
796 | rdev->sb_loaded = 1; | |
797 | return 0; | |
798 | ||
799 | fail: | |
800 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
801 | bdevname(rdev->bdev,b)); | |
802 | return -EINVAL; | |
803 | } | |
804 | ||
805 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
806 | { | |
f72ffdd6 | 807 | return sb1->set_uuid0 == sb2->set_uuid0 && |
05710466 AN |
808 | sb1->set_uuid1 == sb2->set_uuid1 && |
809 | sb1->set_uuid2 == sb2->set_uuid2 && | |
810 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
811 | } |
812 | ||
1da177e4 LT |
813 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
814 | { | |
815 | int ret; | |
816 | mdp_super_t *tmp1, *tmp2; | |
817 | ||
818 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
819 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
820 | ||
821 | if (!tmp1 || !tmp2) { | |
822 | ret = 0; | |
35020f1a | 823 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
824 | goto abort; |
825 | } | |
826 | ||
827 | *tmp1 = *sb1; | |
828 | *tmp2 = *sb2; | |
829 | ||
830 | /* | |
831 | * nr_disks is not constant | |
832 | */ | |
833 | tmp1->nr_disks = 0; | |
834 | tmp2->nr_disks = 0; | |
835 | ||
ce0c8e05 | 836 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 837 | abort: |
990a8baf JJ |
838 | kfree(tmp1); |
839 | kfree(tmp2); | |
1da177e4 LT |
840 | return ret; |
841 | } | |
842 | ||
4d167f09 N |
843 | static u32 md_csum_fold(u32 csum) |
844 | { | |
845 | csum = (csum & 0xffff) + (csum >> 16); | |
846 | return (csum & 0xffff) + (csum >> 16); | |
847 | } | |
848 | ||
f72ffdd6 | 849 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
1da177e4 | 850 | { |
4d167f09 N |
851 | u64 newcsum = 0; |
852 | u32 *sb32 = (u32*)sb; | |
853 | int i; | |
1da177e4 LT |
854 | unsigned int disk_csum, csum; |
855 | ||
856 | disk_csum = sb->sb_csum; | |
857 | sb->sb_csum = 0; | |
4d167f09 N |
858 | |
859 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
860 | newcsum += sb32[i]; | |
861 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
862 | ||
4d167f09 N |
863 | #ifdef CONFIG_ALPHA |
864 | /* This used to use csum_partial, which was wrong for several | |
865 | * reasons including that different results are returned on | |
866 | * different architectures. It isn't critical that we get exactly | |
867 | * the same return value as before (we always csum_fold before | |
868 | * testing, and that removes any differences). However as we | |
869 | * know that csum_partial always returned a 16bit value on | |
870 | * alphas, do a fold to maximise conformity to previous behaviour. | |
871 | */ | |
872 | sb->sb_csum = md_csum_fold(disk_csum); | |
873 | #else | |
1da177e4 | 874 | sb->sb_csum = disk_csum; |
4d167f09 | 875 | #endif |
1da177e4 LT |
876 | return csum; |
877 | } | |
878 | ||
1da177e4 LT |
879 | /* |
880 | * Handle superblock details. | |
881 | * We want to be able to handle multiple superblock formats | |
882 | * so we have a common interface to them all, and an array of | |
883 | * different handlers. | |
884 | * We rely on user-space to write the initial superblock, and support | |
885 | * reading and updating of superblocks. | |
886 | * Interface methods are: | |
3cb03002 | 887 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
888 | * loads and validates a superblock on dev. |
889 | * if refdev != NULL, compare superblocks on both devices | |
890 | * Return: | |
891 | * 0 - dev has a superblock that is compatible with refdev | |
892 | * 1 - dev has a superblock that is compatible and newer than refdev | |
893 | * so dev should be used as the refdev in future | |
894 | * -EINVAL superblock incompatible or invalid | |
895 | * -othererror e.g. -EIO | |
896 | * | |
fd01b88c | 897 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
898 | * Verify that dev is acceptable into mddev. |
899 | * The first time, mddev->raid_disks will be 0, and data from | |
900 | * dev should be merged in. Subsequent calls check that dev | |
901 | * is new enough. Return 0 or -EINVAL | |
902 | * | |
fd01b88c | 903 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
904 | * Update the superblock for rdev with data in mddev |
905 | * This does not write to disc. | |
906 | * | |
907 | */ | |
908 | ||
909 | struct super_type { | |
0cd17fec CW |
910 | char *name; |
911 | struct module *owner; | |
c6563a8c N |
912 | int (*load_super)(struct md_rdev *rdev, |
913 | struct md_rdev *refdev, | |
0cd17fec | 914 | int minor_version); |
c6563a8c N |
915 | int (*validate_super)(struct mddev *mddev, |
916 | struct md_rdev *rdev); | |
917 | void (*sync_super)(struct mddev *mddev, | |
918 | struct md_rdev *rdev); | |
3cb03002 | 919 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 920 | sector_t num_sectors); |
c6563a8c N |
921 | int (*allow_new_offset)(struct md_rdev *rdev, |
922 | unsigned long long new_offset); | |
1da177e4 LT |
923 | }; |
924 | ||
0894cc30 AN |
925 | /* |
926 | * Check that the given mddev has no bitmap. | |
927 | * | |
928 | * This function is called from the run method of all personalities that do not | |
929 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
930 | * has a bitmap. Otherwise, it returns 0. | |
931 | * | |
932 | */ | |
fd01b88c | 933 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 934 | { |
c3d9714e | 935 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
936 | return 0; |
937 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
938 | mdname(mddev), mddev->pers->name); | |
939 | return 1; | |
940 | } | |
941 | EXPORT_SYMBOL(md_check_no_bitmap); | |
942 | ||
1da177e4 | 943 | /* |
f72ffdd6 | 944 | * load_super for 0.90.0 |
1da177e4 | 945 | */ |
3cb03002 | 946 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
947 | { |
948 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
949 | mdp_super_t *sb; | |
950 | int ret; | |
1da177e4 LT |
951 | |
952 | /* | |
0f420358 | 953 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
954 | * it's at the end of the disk. |
955 | * | |
956 | * It also happens to be a multiple of 4Kb. | |
957 | */ | |
57b2caa3 | 958 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 959 | |
0002b271 | 960 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
961 | if (ret) return ret; |
962 | ||
963 | ret = -EINVAL; | |
964 | ||
965 | bdevname(rdev->bdev, b); | |
65a06f06 | 966 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
967 | |
968 | if (sb->md_magic != MD_SB_MAGIC) { | |
969 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
970 | b); | |
971 | goto abort; | |
972 | } | |
973 | ||
974 | if (sb->major_version != 0 || | |
f6705578 N |
975 | sb->minor_version < 90 || |
976 | sb->minor_version > 91) { | |
1da177e4 LT |
977 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
978 | sb->major_version, sb->minor_version, | |
979 | b); | |
980 | goto abort; | |
981 | } | |
982 | ||
983 | if (sb->raid_disks <= 0) | |
984 | goto abort; | |
985 | ||
4d167f09 | 986 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
987 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
988 | b); | |
989 | goto abort; | |
990 | } | |
991 | ||
992 | rdev->preferred_minor = sb->md_minor; | |
993 | rdev->data_offset = 0; | |
c6563a8c | 994 | rdev->new_data_offset = 0; |
0002b271 | 995 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 996 | rdev->badblocks.shift = -1; |
1da177e4 LT |
997 | |
998 | if (sb->level == LEVEL_MULTIPATH) | |
999 | rdev->desc_nr = -1; | |
1000 | else | |
1001 | rdev->desc_nr = sb->this_disk.number; | |
1002 | ||
9a7b2b0f | 1003 | if (!refdev) { |
1da177e4 | 1004 | ret = 1; |
9a7b2b0f | 1005 | } else { |
1da177e4 | 1006 | __u64 ev1, ev2; |
65a06f06 | 1007 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1008 | if (!uuid_equal(refsb, sb)) { |
1009 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1010 | b, bdevname(refdev->bdev,b2)); | |
1011 | goto abort; | |
1012 | } | |
1013 | if (!sb_equal(refsb, sb)) { | |
1014 | printk(KERN_WARNING "md: %s has same UUID" | |
1015 | " but different superblock to %s\n", | |
1016 | b, bdevname(refdev->bdev, b2)); | |
1017 | goto abort; | |
1018 | } | |
1019 | ev1 = md_event(sb); | |
1020 | ev2 = md_event(refsb); | |
1021 | if (ev1 > ev2) | |
1022 | ret = 1; | |
f72ffdd6 | 1023 | else |
1da177e4 LT |
1024 | ret = 0; |
1025 | } | |
8190e754 | 1026 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1027 | /* Limit to 4TB as metadata cannot record more than that. |
1028 | * (not needed for Linear and RAID0 as metadata doesn't | |
1029 | * record this size) | |
1030 | */ | |
1031 | if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) | |
27a7b260 | 1032 | rdev->sectors = (2ULL << 32) - 2; |
1da177e4 | 1033 | |
27a7b260 | 1034 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1035 | /* "this cannot possibly happen" ... */ |
1036 | ret = -EINVAL; | |
1037 | ||
1da177e4 LT |
1038 | abort: |
1039 | return ret; | |
1040 | } | |
1041 | ||
1042 | /* | |
1043 | * validate_super for 0.90.0 | |
1044 | */ | |
fd01b88c | 1045 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1046 | { |
1047 | mdp_disk_t *desc; | |
65a06f06 | 1048 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1049 | __u64 ev1 = md_event(sb); |
1da177e4 | 1050 | |
41158c7e | 1051 | rdev->raid_disk = -1; |
c5d79adb N |
1052 | clear_bit(Faulty, &rdev->flags); |
1053 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1054 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1055 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1056 | |
1da177e4 LT |
1057 | if (mddev->raid_disks == 0) { |
1058 | mddev->major_version = 0; | |
1059 | mddev->minor_version = sb->minor_version; | |
1060 | mddev->patch_version = sb->patch_version; | |
e691063a | 1061 | mddev->external = 0; |
9d8f0363 | 1062 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1063 | mddev->ctime = sb->ctime; |
1064 | mddev->utime = sb->utime; | |
1065 | mddev->level = sb->level; | |
d9d166c2 | 1066 | mddev->clevel[0] = 0; |
1da177e4 LT |
1067 | mddev->layout = sb->layout; |
1068 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1069 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1070 | mddev->events = ev1; |
c3d9714e | 1071 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1072 | mddev->bitmap_info.space = 0; |
1073 | /* bitmap can use 60 K after the 4K superblocks */ | |
c3d9714e | 1074 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 1075 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
2c810cdd | 1076 | mddev->reshape_backwards = 0; |
1da177e4 | 1077 | |
f6705578 N |
1078 | if (mddev->minor_version >= 91) { |
1079 | mddev->reshape_position = sb->reshape_position; | |
1080 | mddev->delta_disks = sb->delta_disks; | |
1081 | mddev->new_level = sb->new_level; | |
1082 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1083 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1084 | if (mddev->delta_disks < 0) |
1085 | mddev->reshape_backwards = 1; | |
f6705578 N |
1086 | } else { |
1087 | mddev->reshape_position = MaxSector; | |
1088 | mddev->delta_disks = 0; | |
1089 | mddev->new_level = mddev->level; | |
1090 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1091 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1092 | } |
1093 | ||
1da177e4 LT |
1094 | if (sb->state & (1<<MD_SB_CLEAN)) |
1095 | mddev->recovery_cp = MaxSector; | |
1096 | else { | |
f72ffdd6 | 1097 | if (sb->events_hi == sb->cp_events_hi && |
1da177e4 LT |
1098 | sb->events_lo == sb->cp_events_lo) { |
1099 | mddev->recovery_cp = sb->recovery_cp; | |
1100 | } else | |
1101 | mddev->recovery_cp = 0; | |
1102 | } | |
1103 | ||
1104 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1105 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1106 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1107 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1108 | ||
1109 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1110 | |
1111 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
6409bb05 | 1112 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1113 | mddev->bitmap_info.offset = |
1114 | mddev->bitmap_info.default_offset; | |
6409bb05 | 1115 | mddev->bitmap_info.space = |
c9ad020f | 1116 | mddev->bitmap_info.default_space; |
6409bb05 | 1117 | } |
a654b9d8 | 1118 | |
41158c7e | 1119 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1120 | /* Insist on good event counter while assembling, except |
1121 | * for spares (which don't need an event count) */ | |
1da177e4 | 1122 | ++ev1; |
be6800a7 N |
1123 | if (sb->disks[rdev->desc_nr].state & ( |
1124 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
f72ffdd6 | 1125 | if (ev1 < mddev->events) |
be6800a7 | 1126 | return -EINVAL; |
41158c7e N |
1127 | } else if (mddev->bitmap) { |
1128 | /* if adding to array with a bitmap, then we can accept an | |
1129 | * older device ... but not too old. | |
1130 | */ | |
41158c7e N |
1131 | if (ev1 < mddev->bitmap->events_cleared) |
1132 | return 0; | |
8313b8e5 N |
1133 | if (ev1 < mddev->events) |
1134 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1135 | } else { |
1136 | if (ev1 < mddev->events) | |
1137 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1138 | return 0; | |
1139 | } | |
41158c7e | 1140 | |
1da177e4 | 1141 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1142 | desc = sb->disks + rdev->desc_nr; |
1143 | ||
1144 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1145 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1146 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1147 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1148 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1149 | rdev->raid_disk = desc->raid_disk; |
f466722c | 1150 | rdev->saved_raid_disk = desc->raid_disk; |
0261cd9f N |
1151 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1152 | /* active but not in sync implies recovery up to | |
1153 | * reshape position. We don't know exactly where | |
1154 | * that is, so set to zero for now */ | |
1155 | if (mddev->minor_version >= 91) { | |
1156 | rdev->recovery_offset = 0; | |
1157 | rdev->raid_disk = desc->raid_disk; | |
1158 | } | |
1da177e4 | 1159 | } |
8ddf9efe N |
1160 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1161 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1162 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1163 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1164 | return 0; |
1165 | } | |
1166 | ||
1167 | /* | |
1168 | * sync_super for 0.90.0 | |
1169 | */ | |
fd01b88c | 1170 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1171 | { |
1172 | mdp_super_t *sb; | |
3cb03002 | 1173 | struct md_rdev *rdev2; |
1da177e4 | 1174 | int next_spare = mddev->raid_disks; |
19133a42 | 1175 | |
1da177e4 LT |
1176 | /* make rdev->sb match mddev data.. |
1177 | * | |
1178 | * 1/ zero out disks | |
1179 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1180 | * 3/ any empty disks < next_spare become removed | |
1181 | * | |
1182 | * disks[0] gets initialised to REMOVED because | |
1183 | * we cannot be sure from other fields if it has | |
1184 | * been initialised or not. | |
1185 | */ | |
1186 | int i; | |
1187 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1188 | ||
61181565 N |
1189 | rdev->sb_size = MD_SB_BYTES; |
1190 | ||
65a06f06 | 1191 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1192 | |
1193 | memset(sb, 0, sizeof(*sb)); | |
1194 | ||
1195 | sb->md_magic = MD_SB_MAGIC; | |
1196 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1197 | sb->patch_version = mddev->patch_version; |
1198 | sb->gvalid_words = 0; /* ignored */ | |
1199 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1200 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1201 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1202 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1203 | ||
1204 | sb->ctime = mddev->ctime; | |
1205 | sb->level = mddev->level; | |
58c0fed4 | 1206 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1207 | sb->raid_disks = mddev->raid_disks; |
1208 | sb->md_minor = mddev->md_minor; | |
e691063a | 1209 | sb->not_persistent = 0; |
1da177e4 LT |
1210 | sb->utime = mddev->utime; |
1211 | sb->state = 0; | |
1212 | sb->events_hi = (mddev->events>>32); | |
1213 | sb->events_lo = (u32)mddev->events; | |
1214 | ||
f6705578 N |
1215 | if (mddev->reshape_position == MaxSector) |
1216 | sb->minor_version = 90; | |
1217 | else { | |
1218 | sb->minor_version = 91; | |
1219 | sb->reshape_position = mddev->reshape_position; | |
1220 | sb->new_level = mddev->new_level; | |
1221 | sb->delta_disks = mddev->delta_disks; | |
1222 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1223 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1224 | } |
1225 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1226 | if (mddev->in_sync) |
1227 | { | |
1228 | sb->recovery_cp = mddev->recovery_cp; | |
1229 | sb->cp_events_hi = (mddev->events>>32); | |
1230 | sb->cp_events_lo = (u32)mddev->events; | |
1231 | if (mddev->recovery_cp == MaxSector) | |
1232 | sb->state = (1<< MD_SB_CLEAN); | |
1233 | } else | |
1234 | sb->recovery_cp = 0; | |
1235 | ||
1236 | sb->layout = mddev->layout; | |
9d8f0363 | 1237 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1238 | |
c3d9714e | 1239 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1240 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1241 | ||
1da177e4 | 1242 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1243 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1244 | mdp_disk_t *d; |
86e6ffdd | 1245 | int desc_nr; |
0261cd9f N |
1246 | int is_active = test_bit(In_sync, &rdev2->flags); |
1247 | ||
1248 | if (rdev2->raid_disk >= 0 && | |
1249 | sb->minor_version >= 91) | |
1250 | /* we have nowhere to store the recovery_offset, | |
1251 | * but if it is not below the reshape_position, | |
1252 | * we can piggy-back on that. | |
1253 | */ | |
1254 | is_active = 1; | |
1255 | if (rdev2->raid_disk < 0 || | |
1256 | test_bit(Faulty, &rdev2->flags)) | |
1257 | is_active = 0; | |
1258 | if (is_active) | |
86e6ffdd | 1259 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1260 | else |
86e6ffdd | 1261 | desc_nr = next_spare++; |
19133a42 | 1262 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1263 | d = &sb->disks[rdev2->desc_nr]; |
1264 | nr_disks++; | |
1265 | d->number = rdev2->desc_nr; | |
1266 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1267 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1268 | if (is_active) |
1da177e4 LT |
1269 | d->raid_disk = rdev2->raid_disk; |
1270 | else | |
1271 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1272 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1273 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1274 | else if (is_active) { |
1da177e4 | 1275 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1276 | if (test_bit(In_sync, &rdev2->flags)) |
1277 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1278 | active++; |
1279 | working++; | |
1280 | } else { | |
1281 | d->state = 0; | |
1282 | spare++; | |
1283 | working++; | |
1284 | } | |
8ddf9efe N |
1285 | if (test_bit(WriteMostly, &rdev2->flags)) |
1286 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1287 | } |
1da177e4 LT |
1288 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1289 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1290 | mdp_disk_t *d = &sb->disks[i]; | |
1291 | if (d->state == 0 && d->number == 0) { | |
1292 | d->number = i; | |
1293 | d->raid_disk = i; | |
1294 | d->state = (1<<MD_DISK_REMOVED); | |
1295 | d->state |= (1<<MD_DISK_FAULTY); | |
1296 | failed++; | |
1297 | } | |
1298 | } | |
1299 | sb->nr_disks = nr_disks; | |
1300 | sb->active_disks = active; | |
1301 | sb->working_disks = working; | |
1302 | sb->failed_disks = failed; | |
1303 | sb->spare_disks = spare; | |
1304 | ||
1305 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1306 | sb->sb_csum = calc_sb_csum(sb); | |
1307 | } | |
1308 | ||
0cd17fec CW |
1309 | /* |
1310 | * rdev_size_change for 0.90.0 | |
1311 | */ | |
1312 | static unsigned long long | |
3cb03002 | 1313 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1314 | { |
58c0fed4 | 1315 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1316 | return 0; /* component must fit device */ |
c3d9714e | 1317 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1318 | return 0; /* can't move bitmap */ |
57b2caa3 | 1319 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1320 | if (!num_sectors || num_sectors > rdev->sb_start) |
1321 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1322 | /* Limit to 4TB as metadata cannot record more than that. |
1323 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1324 | */ | |
667a5313 | 1325 | if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) |
27a7b260 | 1326 | num_sectors = (2ULL << 32) - 2; |
0f420358 | 1327 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1328 | rdev->sb_page); |
1329 | md_super_wait(rdev->mddev); | |
c26a44ed | 1330 | return num_sectors; |
0cd17fec CW |
1331 | } |
1332 | ||
c6563a8c N |
1333 | static int |
1334 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1335 | { | |
1336 | /* non-zero offset changes not possible with v0.90 */ | |
1337 | return new_offset == 0; | |
1338 | } | |
0cd17fec | 1339 | |
1da177e4 LT |
1340 | /* |
1341 | * version 1 superblock | |
1342 | */ | |
1343 | ||
f72ffdd6 | 1344 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
1da177e4 | 1345 | { |
1c05b4bc N |
1346 | __le32 disk_csum; |
1347 | u32 csum; | |
1da177e4 LT |
1348 | unsigned long long newcsum; |
1349 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1350 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1351 | |
1352 | disk_csum = sb->sb_csum; | |
1353 | sb->sb_csum = 0; | |
1354 | newcsum = 0; | |
1f3c9907 | 1355 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1356 | newcsum += le32_to_cpu(*isuper++); |
1357 | ||
1358 | if (size == 2) | |
1c05b4bc | 1359 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1360 | |
1361 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1362 | sb->sb_csum = disk_csum; | |
1363 | return cpu_to_le32(csum); | |
1364 | } | |
1365 | ||
2699b672 N |
1366 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1367 | int acknowledged); | |
3cb03002 | 1368 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1369 | { |
1370 | struct mdp_superblock_1 *sb; | |
1371 | int ret; | |
0f420358 | 1372 | sector_t sb_start; |
c6563a8c | 1373 | sector_t sectors; |
1da177e4 | 1374 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1375 | int bmask; |
1da177e4 LT |
1376 | |
1377 | /* | |
0f420358 | 1378 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1379 | * It is always aligned to a 4K boundary and |
1380 | * depeding on minor_version, it can be: | |
1381 | * 0: At least 8K, but less than 12K, from end of device | |
1382 | * 1: At start of device | |
1383 | * 2: 4K from start of device. | |
1384 | */ | |
1385 | switch(minor_version) { | |
1386 | case 0: | |
77304d2a | 1387 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1388 | sb_start -= 8*2; |
1389 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1390 | break; |
1391 | case 1: | |
0f420358 | 1392 | sb_start = 0; |
1da177e4 LT |
1393 | break; |
1394 | case 2: | |
0f420358 | 1395 | sb_start = 8; |
1da177e4 LT |
1396 | break; |
1397 | default: | |
1398 | return -EINVAL; | |
1399 | } | |
0f420358 | 1400 | rdev->sb_start = sb_start; |
1da177e4 | 1401 | |
0002b271 N |
1402 | /* superblock is rarely larger than 1K, but it can be larger, |
1403 | * and it is safe to read 4k, so we do that | |
1404 | */ | |
1405 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1406 | if (ret) return ret; |
1407 | ||
65a06f06 | 1408 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1409 | |
1410 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1411 | sb->major_version != cpu_to_le32(1) || | |
1412 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1413 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1414 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1415 | return -EINVAL; |
1416 | ||
1417 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1418 | printk("md: invalid superblock checksum on %s\n", | |
1419 | bdevname(rdev->bdev,b)); | |
1420 | return -EINVAL; | |
1421 | } | |
1422 | if (le64_to_cpu(sb->data_size) < 10) { | |
1423 | printk("md: data_size too small on %s\n", | |
1424 | bdevname(rdev->bdev,b)); | |
1425 | return -EINVAL; | |
1426 | } | |
c6563a8c N |
1427 | if (sb->pad0 || |
1428 | sb->pad3[0] || | |
1429 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1430 | /* Some padding is non-zero, might be a new feature */ | |
1431 | return -EINVAL; | |
e11e93fa | 1432 | |
1da177e4 LT |
1433 | rdev->preferred_minor = 0xffff; |
1434 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1435 | rdev->new_data_offset = rdev->data_offset; |
1436 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1437 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1438 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1439 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1440 | |
0002b271 | 1441 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1442 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1443 | if (rdev->sb_size & bmask) |
a1801f85 N |
1444 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1445 | ||
1446 | if (minor_version | |
0f420358 | 1447 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1448 | return -EINVAL; |
c6563a8c N |
1449 | if (minor_version |
1450 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1451 | return -EINVAL; | |
0002b271 | 1452 | |
31b65a0d N |
1453 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1454 | rdev->desc_nr = -1; | |
1455 | else | |
1456 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1457 | ||
2699b672 N |
1458 | if (!rdev->bb_page) { |
1459 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1460 | if (!rdev->bb_page) | |
1461 | return -ENOMEM; | |
1462 | } | |
1463 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1464 | rdev->badblocks.count == 0) { | |
1465 | /* need to load the bad block list. | |
1466 | * Currently we limit it to one page. | |
1467 | */ | |
1468 | s32 offset; | |
1469 | sector_t bb_sector; | |
1470 | u64 *bbp; | |
1471 | int i; | |
1472 | int sectors = le16_to_cpu(sb->bblog_size); | |
1473 | if (sectors > (PAGE_SIZE / 512)) | |
1474 | return -EINVAL; | |
1475 | offset = le32_to_cpu(sb->bblog_offset); | |
1476 | if (offset == 0) | |
1477 | return -EINVAL; | |
1478 | bb_sector = (long long)offset; | |
1479 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1480 | rdev->bb_page, READ, true)) | |
1481 | return -EIO; | |
1482 | bbp = (u64 *)page_address(rdev->bb_page); | |
1483 | rdev->badblocks.shift = sb->bblog_shift; | |
1484 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1485 | u64 bb = le64_to_cpu(*bbp); | |
1486 | int count = bb & (0x3ff); | |
1487 | u64 sector = bb >> 10; | |
1488 | sector <<= sb->bblog_shift; | |
1489 | count <<= sb->bblog_shift; | |
1490 | if (bb + 1 == 0) | |
1491 | break; | |
1492 | if (md_set_badblocks(&rdev->badblocks, | |
1493 | sector, count, 1) == 0) | |
1494 | return -EINVAL; | |
1495 | } | |
486adf72 N |
1496 | } else if (sb->bblog_offset != 0) |
1497 | rdev->badblocks.shift = 0; | |
2699b672 | 1498 | |
9a7b2b0f | 1499 | if (!refdev) { |
8ed75463 | 1500 | ret = 1; |
9a7b2b0f | 1501 | } else { |
1da177e4 | 1502 | __u64 ev1, ev2; |
65a06f06 | 1503 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1504 | |
1505 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1506 | sb->level != refsb->level || | |
1507 | sb->layout != refsb->layout || | |
1508 | sb->chunksize != refsb->chunksize) { | |
1509 | printk(KERN_WARNING "md: %s has strangely different" | |
1510 | " superblock to %s\n", | |
1511 | bdevname(rdev->bdev,b), | |
1512 | bdevname(refdev->bdev,b2)); | |
1513 | return -EINVAL; | |
1514 | } | |
1515 | ev1 = le64_to_cpu(sb->events); | |
1516 | ev2 = le64_to_cpu(refsb->events); | |
1517 | ||
1518 | if (ev1 > ev2) | |
8ed75463 N |
1519 | ret = 1; |
1520 | else | |
1521 | ret = 0; | |
1da177e4 | 1522 | } |
c6563a8c N |
1523 | if (minor_version) { |
1524 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1525 | sectors -= rdev->data_offset; | |
1526 | } else | |
1527 | sectors = rdev->sb_start; | |
1528 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1529 | return -EINVAL; |
dd8ac336 | 1530 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1531 | return ret; |
1da177e4 LT |
1532 | } |
1533 | ||
fd01b88c | 1534 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1535 | { |
65a06f06 | 1536 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1537 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1538 | |
41158c7e | 1539 | rdev->raid_disk = -1; |
c5d79adb N |
1540 | clear_bit(Faulty, &rdev->flags); |
1541 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1542 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1543 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1544 | |
1da177e4 LT |
1545 | if (mddev->raid_disks == 0) { |
1546 | mddev->major_version = 1; | |
1547 | mddev->patch_version = 0; | |
e691063a | 1548 | mddev->external = 0; |
9d8f0363 | 1549 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1550 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1551 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1552 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1553 | mddev->clevel[0] = 0; |
1da177e4 LT |
1554 | mddev->layout = le32_to_cpu(sb->layout); |
1555 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1556 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1557 | mddev->events = ev1; |
c3d9714e | 1558 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1559 | mddev->bitmap_info.space = 0; |
1560 | /* Default location for bitmap is 1K after superblock | |
1561 | * using 3K - total of 4K | |
1562 | */ | |
c3d9714e | 1563 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1564 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1565 | mddev->reshape_backwards = 0; |
1566 | ||
1da177e4 LT |
1567 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1568 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1569 | ||
1570 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1571 | |
71c0805c | 1572 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1573 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1574 | mddev->bitmap_info.offset = |
1575 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1576 | /* Metadata doesn't record how much space is available. |
1577 | * For 1.0, we assume we can use up to the superblock | |
1578 | * if before, else to 4K beyond superblock. | |
1579 | * For others, assume no change is possible. | |
1580 | */ | |
1581 | if (mddev->minor_version > 0) | |
1582 | mddev->bitmap_info.space = 0; | |
1583 | else if (mddev->bitmap_info.offset > 0) | |
1584 | mddev->bitmap_info.space = | |
1585 | 8 - mddev->bitmap_info.offset; | |
1586 | else | |
1587 | mddev->bitmap_info.space = | |
1588 | -mddev->bitmap_info.offset; | |
1589 | } | |
e11e93fa | 1590 | |
f6705578 N |
1591 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1592 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1593 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1594 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1595 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1596 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1597 | if (mddev->delta_disks < 0 || |
1598 | (mddev->delta_disks == 0 && | |
1599 | (le32_to_cpu(sb->feature_map) | |
1600 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1601 | mddev->reshape_backwards = 1; | |
f6705578 N |
1602 | } else { |
1603 | mddev->reshape_position = MaxSector; | |
1604 | mddev->delta_disks = 0; | |
1605 | mddev->new_level = mddev->level; | |
1606 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1607 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1608 | } |
1609 | ||
41158c7e | 1610 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1611 | /* Insist of good event counter while assembling, except for |
1612 | * spares (which don't need an event count) */ | |
1da177e4 | 1613 | ++ev1; |
be6800a7 N |
1614 | if (rdev->desc_nr >= 0 && |
1615 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1616 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1617 | if (ev1 < mddev->events) | |
1618 | return -EINVAL; | |
41158c7e N |
1619 | } else if (mddev->bitmap) { |
1620 | /* If adding to array with a bitmap, then we can accept an | |
1621 | * older device, but not too old. | |
1622 | */ | |
41158c7e N |
1623 | if (ev1 < mddev->bitmap->events_cleared) |
1624 | return 0; | |
8313b8e5 N |
1625 | if (ev1 < mddev->events) |
1626 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1627 | } else { |
1628 | if (ev1 < mddev->events) | |
1629 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1630 | return 0; | |
1631 | } | |
1da177e4 LT |
1632 | if (mddev->level != LEVEL_MULTIPATH) { |
1633 | int role; | |
3673f305 N |
1634 | if (rdev->desc_nr < 0 || |
1635 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1636 | role = 0xffff; | |
1637 | rdev->desc_nr = -1; | |
1638 | } else | |
1639 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1640 | switch(role) { |
1641 | case 0xffff: /* spare */ | |
1da177e4 LT |
1642 | break; |
1643 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1644 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1645 | break; |
1646 | default: | |
f466722c | 1647 | rdev->saved_raid_disk = role; |
5fd6c1dc | 1648 | if ((le32_to_cpu(sb->feature_map) & |
f466722c | 1649 | MD_FEATURE_RECOVERY_OFFSET)) { |
5fd6c1dc | 1650 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
f466722c N |
1651 | if (!(le32_to_cpu(sb->feature_map) & |
1652 | MD_FEATURE_RECOVERY_BITMAP)) | |
1653 | rdev->saved_raid_disk = -1; | |
1654 | } else | |
5fd6c1dc | 1655 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1656 | rdev->raid_disk = role; |
1657 | break; | |
1658 | } | |
8ddf9efe N |
1659 | if (sb->devflags & WriteMostly1) |
1660 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1661 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1662 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1663 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1664 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1665 | |
1da177e4 LT |
1666 | return 0; |
1667 | } | |
1668 | ||
fd01b88c | 1669 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1670 | { |
1671 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1672 | struct md_rdev *rdev2; |
1da177e4 LT |
1673 | int max_dev, i; |
1674 | /* make rdev->sb match mddev and rdev data. */ | |
1675 | ||
65a06f06 | 1676 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1677 | |
1678 | sb->feature_map = 0; | |
1679 | sb->pad0 = 0; | |
5fd6c1dc | 1680 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1681 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1682 | ||
1683 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1684 | sb->events = cpu_to_le64(mddev->events); | |
1685 | if (mddev->in_sync) | |
1686 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1687 | else | |
1688 | sb->resync_offset = cpu_to_le64(0); | |
1689 | ||
1c05b4bc | 1690 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1691 | |
f0ca340c | 1692 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1693 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1694 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1695 | sb->level = cpu_to_le32(mddev->level); |
1696 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1697 | |
aeb9b211 N |
1698 | if (test_bit(WriteMostly, &rdev->flags)) |
1699 | sb->devflags |= WriteMostly1; | |
1700 | else | |
1701 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1702 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1703 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1704 | |
c3d9714e N |
1705 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1706 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1707 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1708 | } |
5fd6c1dc N |
1709 | |
1710 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1711 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1712 | sb->feature_map |= |
1713 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1714 | sb->recovery_offset = | |
1715 | cpu_to_le64(rdev->recovery_offset); | |
f466722c N |
1716 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
1717 | sb->feature_map |= | |
1718 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); | |
5fd6c1dc | 1719 | } |
2d78f8c4 N |
1720 | if (test_bit(Replacement, &rdev->flags)) |
1721 | sb->feature_map |= | |
1722 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1723 | |
f6705578 N |
1724 | if (mddev->reshape_position != MaxSector) { |
1725 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1726 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1727 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1728 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1729 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1730 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1731 | if (mddev->delta_disks == 0 && |
1732 | mddev->reshape_backwards) | |
1733 | sb->feature_map | |
1734 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1735 | if (rdev->new_data_offset != rdev->data_offset) { |
1736 | sb->feature_map | |
1737 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1738 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1739 | - rdev->data_offset)); | |
1740 | } | |
f6705578 | 1741 | } |
a654b9d8 | 1742 | |
2699b672 N |
1743 | if (rdev->badblocks.count == 0) |
1744 | /* Nothing to do for bad blocks*/ ; | |
1745 | else if (sb->bblog_offset == 0) | |
1746 | /* Cannot record bad blocks on this device */ | |
1747 | md_error(mddev, rdev); | |
1748 | else { | |
1749 | struct badblocks *bb = &rdev->badblocks; | |
1750 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1751 | u64 *p = bb->page; | |
1752 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1753 | if (bb->changed) { | |
1754 | unsigned seq; | |
1755 | ||
1756 | retry: | |
1757 | seq = read_seqbegin(&bb->lock); | |
1758 | ||
1759 | memset(bbp, 0xff, PAGE_SIZE); | |
1760 | ||
1761 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1762 | u64 internal_bb = p[i]; |
2699b672 N |
1763 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1764 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1765 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1766 | } |
d0962936 | 1767 | bb->changed = 0; |
2699b672 N |
1768 | if (read_seqretry(&bb->lock, seq)) |
1769 | goto retry; | |
1770 | ||
1771 | bb->sector = (rdev->sb_start + | |
1772 | (int)le32_to_cpu(sb->bblog_offset)); | |
1773 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1774 | } |
1775 | } | |
1776 | ||
1da177e4 | 1777 | max_dev = 0; |
dafb20fa | 1778 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1779 | if (rdev2->desc_nr+1 > max_dev) |
1780 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1781 | |
70471daf N |
1782 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1783 | int bmask; | |
a778b73f | 1784 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1785 | rdev->sb_size = max_dev * 2 + 256; |
1786 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1787 | if (rdev->sb_size & bmask) | |
1788 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1789 | } else |
1790 | max_dev = le32_to_cpu(sb->max_dev); | |
1791 | ||
1da177e4 LT |
1792 | for (i=0; i<max_dev;i++) |
1793 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
f72ffdd6 | 1794 | |
dafb20fa | 1795 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1796 | i = rdev2->desc_nr; |
b2d444d7 | 1797 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1798 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1799 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1800 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1801 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1802 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1803 | else |
1804 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1805 | } | |
1806 | ||
1da177e4 LT |
1807 | sb->sb_csum = calc_sb_1_csum(sb); |
1808 | } | |
1809 | ||
0cd17fec | 1810 | static unsigned long long |
3cb03002 | 1811 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1812 | { |
1813 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1814 | sector_t max_sectors; |
58c0fed4 | 1815 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1816 | return 0; /* component must fit device */ |
c6563a8c N |
1817 | if (rdev->data_offset != rdev->new_data_offset) |
1818 | return 0; /* too confusing */ | |
0f420358 | 1819 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1820 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1821 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1822 | max_sectors -= rdev->data_offset; |
1823 | if (!num_sectors || num_sectors > max_sectors) | |
1824 | num_sectors = max_sectors; | |
c3d9714e | 1825 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1826 | /* minor version 0 with bitmap we can't move */ |
1827 | return 0; | |
1828 | } else { | |
1829 | /* minor version 0; superblock after data */ | |
0f420358 | 1830 | sector_t sb_start; |
77304d2a | 1831 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1832 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1833 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1834 | if (!num_sectors || num_sectors > max_sectors) |
1835 | num_sectors = max_sectors; | |
0f420358 | 1836 | rdev->sb_start = sb_start; |
0cd17fec | 1837 | } |
65a06f06 | 1838 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1839 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1840 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1841 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1842 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1843 | rdev->sb_page); |
1844 | md_super_wait(rdev->mddev); | |
c26a44ed | 1845 | return num_sectors; |
c6563a8c N |
1846 | |
1847 | } | |
1848 | ||
1849 | static int | |
1850 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1851 | unsigned long long new_offset) | |
1852 | { | |
1853 | /* All necessary checks on new >= old have been done */ | |
1854 | struct bitmap *bitmap; | |
1855 | if (new_offset >= rdev->data_offset) | |
1856 | return 1; | |
1857 | ||
1858 | /* with 1.0 metadata, there is no metadata to tread on | |
1859 | * so we can always move back */ | |
1860 | if (rdev->mddev->minor_version == 0) | |
1861 | return 1; | |
1862 | ||
1863 | /* otherwise we must be sure not to step on | |
1864 | * any metadata, so stay: | |
1865 | * 36K beyond start of superblock | |
1866 | * beyond end of badblocks | |
1867 | * beyond write-intent bitmap | |
1868 | */ | |
1869 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1870 | return 0; | |
1871 | bitmap = rdev->mddev->bitmap; | |
1872 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1873 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 1874 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
1875 | return 0; |
1876 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1877 | return 0; | |
1878 | ||
1879 | return 1; | |
0cd17fec | 1880 | } |
1da177e4 | 1881 | |
75c96f85 | 1882 | static struct super_type super_types[] = { |
1da177e4 LT |
1883 | [0] = { |
1884 | .name = "0.90.0", | |
1885 | .owner = THIS_MODULE, | |
0cd17fec CW |
1886 | .load_super = super_90_load, |
1887 | .validate_super = super_90_validate, | |
1888 | .sync_super = super_90_sync, | |
1889 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1890 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1891 | }, |
1892 | [1] = { | |
1893 | .name = "md-1", | |
1894 | .owner = THIS_MODULE, | |
0cd17fec CW |
1895 | .load_super = super_1_load, |
1896 | .validate_super = super_1_validate, | |
1897 | .sync_super = super_1_sync, | |
1898 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1899 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1900 | }, |
1901 | }; | |
1da177e4 | 1902 | |
fd01b88c | 1903 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1904 | { |
1905 | if (mddev->sync_super) { | |
1906 | mddev->sync_super(mddev, rdev); | |
1907 | return; | |
1908 | } | |
1909 | ||
1910 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1911 | ||
1912 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1913 | } | |
1914 | ||
fd01b88c | 1915 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1916 | { |
3cb03002 | 1917 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1918 | |
4b80991c N |
1919 | rcu_read_lock(); |
1920 | rdev_for_each_rcu(rdev, mddev1) | |
1921 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1922 | if (rdev->bdev->bd_contains == |
4b80991c N |
1923 | rdev2->bdev->bd_contains) { |
1924 | rcu_read_unlock(); | |
7dd5e7c3 | 1925 | return 1; |
4b80991c N |
1926 | } |
1927 | rcu_read_unlock(); | |
1da177e4 LT |
1928 | return 0; |
1929 | } | |
1930 | ||
1931 | static LIST_HEAD(pending_raid_disks); | |
1932 | ||
ac5e7113 AN |
1933 | /* |
1934 | * Try to register data integrity profile for an mddev | |
1935 | * | |
1936 | * This is called when an array is started and after a disk has been kicked | |
1937 | * from the array. It only succeeds if all working and active component devices | |
1938 | * are integrity capable with matching profiles. | |
1939 | */ | |
fd01b88c | 1940 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1941 | { |
3cb03002 | 1942 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1943 | |
1944 | if (list_empty(&mddev->disks)) | |
1945 | return 0; /* nothing to do */ | |
629acb6a JB |
1946 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1947 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 1948 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
1949 | /* skip spares and non-functional disks */ |
1950 | if (test_bit(Faulty, &rdev->flags)) | |
1951 | continue; | |
1952 | if (rdev->raid_disk < 0) | |
1953 | continue; | |
ac5e7113 AN |
1954 | if (!reference) { |
1955 | /* Use the first rdev as the reference */ | |
1956 | reference = rdev; | |
1957 | continue; | |
1958 | } | |
1959 | /* does this rdev's profile match the reference profile? */ | |
1960 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1961 | rdev->bdev->bd_disk) < 0) | |
1962 | return -EINVAL; | |
1963 | } | |
89078d57 MP |
1964 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1965 | return 0; | |
ac5e7113 AN |
1966 | /* |
1967 | * All component devices are integrity capable and have matching | |
1968 | * profiles, register the common profile for the md device. | |
1969 | */ | |
1970 | if (blk_integrity_register(mddev->gendisk, | |
1971 | bdev_get_integrity(reference->bdev)) != 0) { | |
1972 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1973 | mdname(mddev)); | |
1974 | return -EINVAL; | |
1975 | } | |
a91a2785 MP |
1976 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
1977 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
1978 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
1979 | mdname(mddev)); | |
1980 | return -EINVAL; | |
1981 | } | |
ac5e7113 AN |
1982 | return 0; |
1983 | } | |
1984 | EXPORT_SYMBOL(md_integrity_register); | |
1985 | ||
1986 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 1987 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 1988 | { |
2863b9eb JB |
1989 | struct blk_integrity *bi_rdev; |
1990 | struct blk_integrity *bi_mddev; | |
1991 | ||
1992 | if (!mddev->gendisk) | |
1993 | return; | |
1994 | ||
1995 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
1996 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 1997 | |
ac5e7113 | 1998 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1999 | return; |
ac5e7113 | 2000 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 2001 | return; |
ac5e7113 AN |
2002 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2003 | rdev->bdev->bd_disk) >= 0) | |
2004 | return; | |
2005 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2006 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2007 | } |
ac5e7113 | 2008 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2009 | |
f72ffdd6 | 2010 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 2011 | { |
7dd5e7c3 | 2012 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2013 | struct kobject *ko; |
1edf80d3 | 2014 | char *s; |
5e55e2f5 | 2015 | int err; |
1da177e4 | 2016 | |
11e2ede0 DW |
2017 | /* prevent duplicates */ |
2018 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2019 | return -EEXIST; | |
2020 | ||
dd8ac336 AN |
2021 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2022 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2023 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2024 | if (mddev->pers) { |
2025 | /* Cannot change size, so fail | |
2026 | * If mddev->level <= 0, then we don't care | |
2027 | * about aligning sizes (e.g. linear) | |
2028 | */ | |
2029 | if (mddev->level > 0) | |
2030 | return -ENOSPC; | |
2031 | } else | |
dd8ac336 | 2032 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2033 | } |
1da177e4 LT |
2034 | |
2035 | /* Verify rdev->desc_nr is unique. | |
2036 | * If it is -1, assign a free number, else | |
2037 | * check number is not in use | |
2038 | */ | |
4878e9eb | 2039 | rcu_read_lock(); |
1da177e4 LT |
2040 | if (rdev->desc_nr < 0) { |
2041 | int choice = 0; | |
4878e9eb N |
2042 | if (mddev->pers) |
2043 | choice = mddev->raid_disks; | |
2044 | while (find_rdev_nr_rcu(mddev, choice)) | |
1da177e4 LT |
2045 | choice++; |
2046 | rdev->desc_nr = choice; | |
2047 | } else { | |
4878e9eb N |
2048 | if (find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
2049 | rcu_read_unlock(); | |
1da177e4 | 2050 | return -EBUSY; |
4878e9eb | 2051 | } |
1da177e4 | 2052 | } |
4878e9eb | 2053 | rcu_read_unlock(); |
de01dfad N |
2054 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2055 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2056 | mdname(mddev), mddev->max_disks); | |
2057 | return -EBUSY; | |
2058 | } | |
19133a42 | 2059 | bdevname(rdev->bdev,b); |
649316b2 | 2060 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2061 | *s = '!'; |
649316b2 | 2062 | |
1da177e4 | 2063 | rdev->mddev = mddev; |
19133a42 | 2064 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2065 | |
b2d6db58 | 2066 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2067 | goto fail; |
86e6ffdd | 2068 | |
0762b8bd | 2069 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2070 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2071 | /* failure here is OK */; | |
2072 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2073 | |
4b80991c | 2074 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2075 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2076 | |
2077 | /* May as well allow recovery to be retried once */ | |
5389042f | 2078 | mddev->recovery_disabled++; |
3f9d99c1 | 2079 | |
1da177e4 | 2080 | return 0; |
5e55e2f5 N |
2081 | |
2082 | fail: | |
2083 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2084 | b, mdname(mddev)); | |
2085 | return err; | |
1da177e4 LT |
2086 | } |
2087 | ||
177a99b2 | 2088 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2089 | { |
3cb03002 | 2090 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2091 | kobject_del(&rdev->kobj); |
177a99b2 | 2092 | kobject_put(&rdev->kobj); |
5792a285 N |
2093 | } |
2094 | ||
f72ffdd6 | 2095 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2096 | { |
2097 | char b[BDEVNAME_SIZE]; | |
403df478 | 2098 | |
49731baa | 2099 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2100 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2101 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2102 | rdev->mddev = NULL; | |
86e6ffdd | 2103 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2104 | sysfs_put(rdev->sysfs_state); |
2105 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2106 | rdev->badblocks.count = 0; |
5792a285 | 2107 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2108 | * writing to 'remove' to "dev/state". We also need |
2109 | * to delay it due to rcu usage. | |
5792a285 | 2110 | */ |
4b80991c | 2111 | synchronize_rcu(); |
177a99b2 N |
2112 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2113 | kobject_get(&rdev->kobj); | |
e804ac78 | 2114 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2115 | } |
2116 | ||
2117 | /* | |
2118 | * prevent the device from being mounted, repartitioned or | |
2119 | * otherwise reused by a RAID array (or any other kernel | |
2120 | * subsystem), by bd_claiming the device. | |
2121 | */ | |
3cb03002 | 2122 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2123 | { |
2124 | int err = 0; | |
2125 | struct block_device *bdev; | |
2126 | char b[BDEVNAME_SIZE]; | |
2127 | ||
d4d77629 | 2128 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2129 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2130 | if (IS_ERR(bdev)) { |
2131 | printk(KERN_ERR "md: could not open %s.\n", | |
2132 | __bdevname(dev, b)); | |
2133 | return PTR_ERR(bdev); | |
2134 | } | |
1da177e4 LT |
2135 | rdev->bdev = bdev; |
2136 | return err; | |
2137 | } | |
2138 | ||
3cb03002 | 2139 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2140 | { |
2141 | struct block_device *bdev = rdev->bdev; | |
2142 | rdev->bdev = NULL; | |
e525fd89 | 2143 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2144 | } |
2145 | ||
2146 | void md_autodetect_dev(dev_t dev); | |
2147 | ||
f72ffdd6 | 2148 | static void export_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2149 | { |
2150 | char b[BDEVNAME_SIZE]; | |
403df478 | 2151 | |
1da177e4 LT |
2152 | printk(KERN_INFO "md: export_rdev(%s)\n", |
2153 | bdevname(rdev->bdev,b)); | |
545c8795 | 2154 | md_rdev_clear(rdev); |
1da177e4 | 2155 | #ifndef MODULE |
d0fae18f N |
2156 | if (test_bit(AutoDetected, &rdev->flags)) |
2157 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2158 | #endif |
2159 | unlock_rdev(rdev); | |
86e6ffdd | 2160 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2161 | } |
2162 | ||
f72ffdd6 | 2163 | static void kick_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2164 | { |
2165 | unbind_rdev_from_array(rdev); | |
2166 | export_rdev(rdev); | |
2167 | } | |
2168 | ||
fd01b88c | 2169 | static void export_array(struct mddev *mddev) |
1da177e4 | 2170 | { |
0638bb0e | 2171 | struct md_rdev *rdev; |
1da177e4 | 2172 | |
0638bb0e N |
2173 | while (!list_empty(&mddev->disks)) { |
2174 | rdev = list_first_entry(&mddev->disks, struct md_rdev, | |
2175 | same_set); | |
1da177e4 LT |
2176 | kick_rdev_from_array(rdev); |
2177 | } | |
1da177e4 LT |
2178 | mddev->raid_disks = 0; |
2179 | mddev->major_version = 0; | |
2180 | } | |
2181 | ||
f72ffdd6 | 2182 | static void sync_sbs(struct mddev *mddev, int nospares) |
1da177e4 | 2183 | { |
42543769 N |
2184 | /* Update each superblock (in-memory image), but |
2185 | * if we are allowed to, skip spares which already | |
2186 | * have the right event counter, or have one earlier | |
2187 | * (which would mean they aren't being marked as dirty | |
2188 | * with the rest of the array) | |
2189 | */ | |
3cb03002 | 2190 | struct md_rdev *rdev; |
dafb20fa | 2191 | rdev_for_each(rdev, mddev) { |
42543769 N |
2192 | if (rdev->sb_events == mddev->events || |
2193 | (nospares && | |
2194 | rdev->raid_disk < 0 && | |
42543769 N |
2195 | rdev->sb_events+1 == mddev->events)) { |
2196 | /* Don't update this superblock */ | |
2197 | rdev->sb_loaded = 2; | |
2198 | } else { | |
076f968b | 2199 | sync_super(mddev, rdev); |
42543769 N |
2200 | rdev->sb_loaded = 1; |
2201 | } | |
1da177e4 LT |
2202 | } |
2203 | } | |
2204 | ||
f72ffdd6 | 2205 | static void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2206 | { |
3cb03002 | 2207 | struct md_rdev *rdev; |
06d91a5f | 2208 | int sync_req; |
42543769 | 2209 | int nospares = 0; |
2699b672 | 2210 | int any_badblocks_changed = 0; |
1da177e4 | 2211 | |
d87f064f N |
2212 | if (mddev->ro) { |
2213 | if (force_change) | |
2214 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2215 | return; | |
2216 | } | |
1da177e4 | 2217 | repeat: |
3a3a5ddb | 2218 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2219 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2220 | if (rdev->raid_disk >= 0 && |
2221 | mddev->delta_disks >= 0 && | |
2222 | !test_bit(In_sync, &rdev->flags) && | |
2223 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2224 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2225 | ||
f72ffdd6 | 2226 | } |
bd52b746 | 2227 | if (!mddev->persistent) { |
070dc6dd | 2228 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2229 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2230 | if (!mddev->external) { |
d97a41dc | 2231 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2232 | rdev_for_each(rdev, mddev) { |
de393cde | 2233 | if (rdev->badblocks.changed) { |
d0962936 | 2234 | rdev->badblocks.changed = 0; |
de393cde N |
2235 | md_ack_all_badblocks(&rdev->badblocks); |
2236 | md_error(mddev, rdev); | |
2237 | } | |
2238 | clear_bit(Blocked, &rdev->flags); | |
2239 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2240 | wake_up(&rdev->blocked_wait); | |
2241 | } | |
2242 | } | |
3a3a5ddb N |
2243 | wake_up(&mddev->sb_wait); |
2244 | return; | |
2245 | } | |
2246 | ||
85572d7c | 2247 | spin_lock(&mddev->lock); |
84692195 | 2248 | |
3a3a5ddb N |
2249 | mddev->utime = get_seconds(); |
2250 | ||
850b2b42 N |
2251 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2252 | force_change = 1; | |
2253 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2254 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2255 | * though if events isn't the right even/odd, we will have to do | |
2256 | * spares after all | |
2257 | */ | |
2258 | nospares = 1; | |
2259 | if (force_change) | |
2260 | nospares = 0; | |
2261 | if (mddev->degraded) | |
84692195 N |
2262 | /* If the array is degraded, then skipping spares is both |
2263 | * dangerous and fairly pointless. | |
2264 | * Dangerous because a device that was removed from the array | |
2265 | * might have a event_count that still looks up-to-date, | |
2266 | * so it can be re-added without a resync. | |
2267 | * Pointless because if there are any spares to skip, | |
2268 | * then a recovery will happen and soon that array won't | |
2269 | * be degraded any more and the spare can go back to sleep then. | |
2270 | */ | |
850b2b42 | 2271 | nospares = 0; |
84692195 | 2272 | |
06d91a5f | 2273 | sync_req = mddev->in_sync; |
42543769 N |
2274 | |
2275 | /* If this is just a dirty<->clean transition, and the array is clean | |
2276 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2277 | if (nospares |
42543769 | 2278 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2279 | && mddev->can_decrease_events |
2280 | && mddev->events != 1) { | |
42543769 | 2281 | mddev->events--; |
a8707c08 N |
2282 | mddev->can_decrease_events = 0; |
2283 | } else { | |
42543769 N |
2284 | /* otherwise we have to go forward and ... */ |
2285 | mddev->events ++; | |
a8707c08 | 2286 | mddev->can_decrease_events = nospares; |
42543769 | 2287 | } |
1da177e4 | 2288 | |
403df478 N |
2289 | /* |
2290 | * This 64-bit counter should never wrap. | |
2291 | * Either we are in around ~1 trillion A.C., assuming | |
2292 | * 1 reboot per second, or we have a bug... | |
2293 | */ | |
2294 | WARN_ON(mddev->events == 0); | |
2699b672 | 2295 | |
dafb20fa | 2296 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2297 | if (rdev->badblocks.changed) |
2298 | any_badblocks_changed++; | |
de393cde N |
2299 | if (test_bit(Faulty, &rdev->flags)) |
2300 | set_bit(FaultRecorded, &rdev->flags); | |
2301 | } | |
2699b672 | 2302 | |
e691063a | 2303 | sync_sbs(mddev, nospares); |
85572d7c | 2304 | spin_unlock(&mddev->lock); |
1da177e4 | 2305 | |
36a4e1fe N |
2306 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2307 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2308 | |
4ad13663 | 2309 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2310 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2311 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2312 | |
42543769 N |
2313 | if (rdev->sb_loaded != 1) |
2314 | continue; /* no noise on spare devices */ | |
1da177e4 | 2315 | |
f466722c | 2316 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2317 | md_super_write(mddev,rdev, |
0f420358 | 2318 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2319 | rdev->sb_page); |
36a4e1fe N |
2320 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2321 | bdevname(rdev->bdev, b), | |
2322 | (unsigned long long)rdev->sb_start); | |
42543769 | 2323 | rdev->sb_events = mddev->events; |
2699b672 N |
2324 | if (rdev->badblocks.size) { |
2325 | md_super_write(mddev, rdev, | |
2326 | rdev->badblocks.sector, | |
2327 | rdev->badblocks.size << 9, | |
2328 | rdev->bb_page); | |
2329 | rdev->badblocks.size = 0; | |
2330 | } | |
7bfa19f2 | 2331 | |
f466722c | 2332 | } else |
36a4e1fe N |
2333 | pr_debug("md: %s (skipping faulty)\n", |
2334 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2335 | |
7bfa19f2 | 2336 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2337 | /* only need to write one superblock... */ |
2338 | break; | |
2339 | } | |
a9701a30 | 2340 | md_super_wait(mddev); |
850b2b42 | 2341 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2342 | |
85572d7c | 2343 | spin_lock(&mddev->lock); |
850b2b42 N |
2344 | if (mddev->in_sync != sync_req || |
2345 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2346 | /* have to write it out again */ |
85572d7c | 2347 | spin_unlock(&mddev->lock); |
06d91a5f N |
2348 | goto repeat; |
2349 | } | |
850b2b42 | 2350 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
85572d7c | 2351 | spin_unlock(&mddev->lock); |
3d310eb7 | 2352 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2353 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2354 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2355 | |
dafb20fa | 2356 | rdev_for_each(rdev, mddev) { |
de393cde N |
2357 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2358 | clear_bit(Blocked, &rdev->flags); | |
2359 | ||
2360 | if (any_badblocks_changed) | |
2699b672 | 2361 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2362 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2363 | wake_up(&rdev->blocked_wait); | |
2364 | } | |
1da177e4 LT |
2365 | } |
2366 | ||
7f6ce769 | 2367 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2368 | * We want to accept with case. For this we use cmd_match. |
2369 | */ | |
2370 | static int cmd_match(const char *cmd, const char *str) | |
2371 | { | |
2372 | /* See if cmd, written into a sysfs file, matches | |
2373 | * str. They must either be the same, or cmd can | |
2374 | * have a trailing newline | |
2375 | */ | |
2376 | while (*cmd && *str && *cmd == *str) { | |
2377 | cmd++; | |
2378 | str++; | |
2379 | } | |
2380 | if (*cmd == '\n') | |
2381 | cmd++; | |
2382 | if (*str || *cmd) | |
2383 | return 0; | |
2384 | return 1; | |
2385 | } | |
2386 | ||
86e6ffdd N |
2387 | struct rdev_sysfs_entry { |
2388 | struct attribute attr; | |
3cb03002 N |
2389 | ssize_t (*show)(struct md_rdev *, char *); |
2390 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2391 | }; |
2392 | ||
2393 | static ssize_t | |
3cb03002 | 2394 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2395 | { |
2396 | char *sep = ""; | |
20a49ff6 | 2397 | size_t len = 0; |
86e6ffdd | 2398 | |
de393cde N |
2399 | if (test_bit(Faulty, &rdev->flags) || |
2400 | rdev->badblocks.unacked_exist) { | |
86e6ffdd N |
2401 | len+= sprintf(page+len, "%sfaulty",sep); |
2402 | sep = ","; | |
2403 | } | |
b2d444d7 | 2404 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2405 | len += sprintf(page+len, "%sin_sync",sep); |
2406 | sep = ","; | |
2407 | } | |
f655675b N |
2408 | if (test_bit(WriteMostly, &rdev->flags)) { |
2409 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2410 | sep = ","; | |
2411 | } | |
de393cde | 2412 | if (test_bit(Blocked, &rdev->flags) || |
52c64152 N |
2413 | (rdev->badblocks.unacked_exist |
2414 | && !test_bit(Faulty, &rdev->flags))) { | |
6bfe0b49 DW |
2415 | len += sprintf(page+len, "%sblocked", sep); |
2416 | sep = ","; | |
2417 | } | |
b2d444d7 N |
2418 | if (!test_bit(Faulty, &rdev->flags) && |
2419 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2420 | len += sprintf(page+len, "%sspare", sep); |
2421 | sep = ","; | |
2422 | } | |
d7a9d443 N |
2423 | if (test_bit(WriteErrorSeen, &rdev->flags)) { |
2424 | len += sprintf(page+len, "%swrite_error", sep); | |
2425 | sep = ","; | |
2426 | } | |
2d78f8c4 N |
2427 | if (test_bit(WantReplacement, &rdev->flags)) { |
2428 | len += sprintf(page+len, "%swant_replacement", sep); | |
2429 | sep = ","; | |
2430 | } | |
2431 | if (test_bit(Replacement, &rdev->flags)) { | |
2432 | len += sprintf(page+len, "%sreplacement", sep); | |
2433 | sep = ","; | |
2434 | } | |
2435 | ||
86e6ffdd N |
2436 | return len+sprintf(page+len, "\n"); |
2437 | } | |
2438 | ||
45dc2de1 | 2439 | static ssize_t |
3cb03002 | 2440 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2441 | { |
2442 | /* can write | |
de393cde | 2443 | * faulty - simulates an error |
45dc2de1 | 2444 | * remove - disconnects the device |
f655675b N |
2445 | * writemostly - sets write_mostly |
2446 | * -writemostly - clears write_mostly | |
de393cde N |
2447 | * blocked - sets the Blocked flags |
2448 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2449 | * insync - sets Insync providing device isn't active |
f466722c N |
2450 | * -insync - clear Insync for a device with a slot assigned, |
2451 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2452 | * write_error - sets WriteErrorSeen |
2453 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2454 | */ |
2455 | int err = -EINVAL; | |
2456 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2457 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2458 | if (test_bit(Faulty, &rdev->flags)) |
2459 | err = 0; | |
2460 | else | |
2461 | err = -EBUSY; | |
45dc2de1 N |
2462 | } else if (cmd_match(buf, "remove")) { |
2463 | if (rdev->raid_disk >= 0) | |
2464 | err = -EBUSY; | |
2465 | else { | |
fd01b88c | 2466 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2467 | kick_rdev_from_array(rdev); |
3f9d7b0d N |
2468 | if (mddev->pers) |
2469 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2470 | md_new_event(mddev); |
2471 | err = 0; | |
2472 | } | |
f655675b N |
2473 | } else if (cmd_match(buf, "writemostly")) { |
2474 | set_bit(WriteMostly, &rdev->flags); | |
2475 | err = 0; | |
2476 | } else if (cmd_match(buf, "-writemostly")) { | |
2477 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2478 | err = 0; |
2479 | } else if (cmd_match(buf, "blocked")) { | |
2480 | set_bit(Blocked, &rdev->flags); | |
2481 | err = 0; | |
2482 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2483 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2484 | rdev->badblocks.unacked_exist) { |
de393cde N |
2485 | /* metadata handler doesn't understand badblocks, |
2486 | * so we need to fail the device | |
2487 | */ | |
2488 | md_error(rdev->mddev, rdev); | |
2489 | } | |
6bfe0b49 | 2490 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2491 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2492 | wake_up(&rdev->blocked_wait); |
2493 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2494 | md_wakeup_thread(rdev->mddev->thread); | |
2495 | ||
6d56e278 N |
2496 | err = 0; |
2497 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2498 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2499 | err = 0; |
f466722c | 2500 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) { |
e1960f8c N |
2501 | if (rdev->mddev->pers == NULL) { |
2502 | clear_bit(In_sync, &rdev->flags); | |
2503 | rdev->saved_raid_disk = rdev->raid_disk; | |
2504 | rdev->raid_disk = -1; | |
2505 | err = 0; | |
2506 | } | |
d7a9d443 N |
2507 | } else if (cmd_match(buf, "write_error")) { |
2508 | set_bit(WriteErrorSeen, &rdev->flags); | |
2509 | err = 0; | |
2510 | } else if (cmd_match(buf, "-write_error")) { | |
2511 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2512 | err = 0; | |
2d78f8c4 N |
2513 | } else if (cmd_match(buf, "want_replacement")) { |
2514 | /* Any non-spare device that is not a replacement can | |
2515 | * become want_replacement at any time, but we then need to | |
2516 | * check if recovery is needed. | |
2517 | */ | |
2518 | if (rdev->raid_disk >= 0 && | |
2519 | !test_bit(Replacement, &rdev->flags)) | |
2520 | set_bit(WantReplacement, &rdev->flags); | |
2521 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2522 | md_wakeup_thread(rdev->mddev->thread); | |
2523 | err = 0; | |
2524 | } else if (cmd_match(buf, "-want_replacement")) { | |
2525 | /* Clearing 'want_replacement' is always allowed. | |
2526 | * Once replacements starts it is too late though. | |
2527 | */ | |
2528 | err = 0; | |
2529 | clear_bit(WantReplacement, &rdev->flags); | |
2530 | } else if (cmd_match(buf, "replacement")) { | |
2531 | /* Can only set a device as a replacement when array has not | |
2532 | * yet been started. Once running, replacement is automatic | |
2533 | * from spares, or by assigning 'slot'. | |
2534 | */ | |
2535 | if (rdev->mddev->pers) | |
2536 | err = -EBUSY; | |
2537 | else { | |
2538 | set_bit(Replacement, &rdev->flags); | |
2539 | err = 0; | |
2540 | } | |
2541 | } else if (cmd_match(buf, "-replacement")) { | |
2542 | /* Similarly, can only clear Replacement before start */ | |
2543 | if (rdev->mddev->pers) | |
2544 | err = -EBUSY; | |
2545 | else { | |
2546 | clear_bit(Replacement, &rdev->flags); | |
2547 | err = 0; | |
2548 | } | |
45dc2de1 | 2549 | } |
00bcb4ac N |
2550 | if (!err) |
2551 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2552 | return err ? err : len; |
2553 | } | |
80ca3a44 N |
2554 | static struct rdev_sysfs_entry rdev_state = |
2555 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2556 | |
4dbcdc75 | 2557 | static ssize_t |
3cb03002 | 2558 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2559 | { |
2560 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2561 | } | |
2562 | ||
2563 | static ssize_t | |
3cb03002 | 2564 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 N |
2565 | { |
2566 | char *e; | |
2567 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2568 | if (*buf && (*e == 0 || *e == '\n')) { | |
2569 | atomic_set(&rdev->corrected_errors, n); | |
2570 | return len; | |
2571 | } | |
2572 | return -EINVAL; | |
2573 | } | |
2574 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2575 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2576 | |
014236d2 | 2577 | static ssize_t |
3cb03002 | 2578 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2579 | { |
2580 | if (rdev->raid_disk < 0) | |
2581 | return sprintf(page, "none\n"); | |
2582 | else | |
2583 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2584 | } | |
2585 | ||
2586 | static ssize_t | |
3cb03002 | 2587 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 N |
2588 | { |
2589 | char *e; | |
c303da6d | 2590 | int err; |
014236d2 N |
2591 | int slot = simple_strtoul(buf, &e, 10); |
2592 | if (strncmp(buf, "none", 4)==0) | |
2593 | slot = -1; | |
2594 | else if (e==buf || (*e && *e!= '\n')) | |
2595 | return -EINVAL; | |
6c2fce2e | 2596 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2597 | /* Setting 'slot' on an active array requires also |
2598 | * updating the 'rd%d' link, and communicating | |
2599 | * with the personality with ->hot_*_disk. | |
2600 | * For now we only support removing | |
2601 | * failed/spare devices. This normally happens automatically, | |
2602 | * but not when the metadata is externally managed. | |
2603 | */ | |
c303da6d N |
2604 | if (rdev->raid_disk == -1) |
2605 | return -EEXIST; | |
2606 | /* personality does all needed checks */ | |
01393f3d | 2607 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2608 | return -EINVAL; |
746d3207 N |
2609 | clear_bit(Blocked, &rdev->flags); |
2610 | remove_and_add_spares(rdev->mddev, rdev); | |
2611 | if (rdev->raid_disk >= 0) | |
2612 | return -EBUSY; | |
c303da6d N |
2613 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2614 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2615 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2616 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2617 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2618 | */ |
2619 | ||
2620 | if (rdev->raid_disk != -1) | |
2621 | return -EBUSY; | |
2622 | ||
c6751b2b N |
2623 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2624 | return -EBUSY; | |
2625 | ||
6c2fce2e NB |
2626 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2627 | return -EINVAL; | |
2628 | ||
ba1b41b6 N |
2629 | if (slot >= rdev->mddev->raid_disks && |
2630 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2631 | return -ENOSPC; | |
2632 | ||
6c2fce2e NB |
2633 | rdev->raid_disk = slot; |
2634 | if (test_bit(In_sync, &rdev->flags)) | |
2635 | rdev->saved_raid_disk = slot; | |
2636 | else | |
2637 | rdev->saved_raid_disk = -1; | |
d30519fc | 2638 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2639 | clear_bit(Bitmap_sync, &rdev->flags); |
6c2fce2e NB |
2640 | err = rdev->mddev->pers-> |
2641 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2642 | if (err) { |
6c2fce2e | 2643 | rdev->raid_disk = -1; |
6c2fce2e | 2644 | return err; |
52664732 | 2645 | } else |
00bcb4ac | 2646 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2647 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2648 | /* failure here is OK */; |
6c2fce2e | 2649 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2650 | } else { |
ba1b41b6 N |
2651 | if (slot >= rdev->mddev->raid_disks && |
2652 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2653 | return -ENOSPC; |
2654 | rdev->raid_disk = slot; | |
2655 | /* assume it is working */ | |
c5d79adb N |
2656 | clear_bit(Faulty, &rdev->flags); |
2657 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2658 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2659 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2660 | } |
014236d2 N |
2661 | return len; |
2662 | } | |
2663 | ||
014236d2 | 2664 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2665 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2666 | |
93c8cad0 | 2667 | static ssize_t |
3cb03002 | 2668 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2669 | { |
6961ece4 | 2670 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2671 | } |
2672 | ||
2673 | static ssize_t | |
3cb03002 | 2674 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2675 | { |
c6563a8c | 2676 | unsigned long long offset; |
b29bebd6 | 2677 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 2678 | return -EINVAL; |
8ed0a521 | 2679 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2680 | return -EBUSY; |
dd8ac336 | 2681 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2682 | /* Must set offset before size, so overlap checks |
2683 | * can be sane */ | |
2684 | return -EBUSY; | |
93c8cad0 | 2685 | rdev->data_offset = offset; |
25f7fd47 | 2686 | rdev->new_data_offset = offset; |
93c8cad0 N |
2687 | return len; |
2688 | } | |
2689 | ||
2690 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2691 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2692 | |
c6563a8c N |
2693 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2694 | { | |
2695 | return sprintf(page, "%llu\n", | |
2696 | (unsigned long long)rdev->new_data_offset); | |
2697 | } | |
2698 | ||
2699 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2700 | const char *buf, size_t len) | |
2701 | { | |
2702 | unsigned long long new_offset; | |
2703 | struct mddev *mddev = rdev->mddev; | |
2704 | ||
b29bebd6 | 2705 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
2706 | return -EINVAL; |
2707 | ||
f851b60d N |
2708 | if (mddev->sync_thread || |
2709 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
2710 | return -EBUSY; |
2711 | if (new_offset == rdev->data_offset) | |
2712 | /* reset is always permitted */ | |
2713 | ; | |
2714 | else if (new_offset > rdev->data_offset) { | |
2715 | /* must not push array size beyond rdev_sectors */ | |
2716 | if (new_offset - rdev->data_offset | |
2717 | + mddev->dev_sectors > rdev->sectors) | |
2718 | return -E2BIG; | |
2719 | } | |
2720 | /* Metadata worries about other space details. */ | |
2721 | ||
2722 | /* decreasing the offset is inconsistent with a backwards | |
2723 | * reshape. | |
2724 | */ | |
2725 | if (new_offset < rdev->data_offset && | |
2726 | mddev->reshape_backwards) | |
2727 | return -EINVAL; | |
2728 | /* Increasing offset is inconsistent with forwards | |
2729 | * reshape. reshape_direction should be set to | |
2730 | * 'backwards' first. | |
2731 | */ | |
2732 | if (new_offset > rdev->data_offset && | |
2733 | !mddev->reshape_backwards) | |
2734 | return -EINVAL; | |
2735 | ||
2736 | if (mddev->pers && mddev->persistent && | |
2737 | !super_types[mddev->major_version] | |
2738 | .allow_new_offset(rdev, new_offset)) | |
2739 | return -E2BIG; | |
2740 | rdev->new_data_offset = new_offset; | |
2741 | if (new_offset > rdev->data_offset) | |
2742 | mddev->reshape_backwards = 1; | |
2743 | else if (new_offset < rdev->data_offset) | |
2744 | mddev->reshape_backwards = 0; | |
2745 | ||
2746 | return len; | |
2747 | } | |
2748 | static struct rdev_sysfs_entry rdev_new_offset = | |
2749 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2750 | ||
83303b61 | 2751 | static ssize_t |
3cb03002 | 2752 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2753 | { |
dd8ac336 | 2754 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2755 | } |
2756 | ||
c5d79adb N |
2757 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2758 | { | |
2759 | /* check if two start/length pairs overlap */ | |
2760 | if (s1+l1 <= s2) | |
2761 | return 0; | |
2762 | if (s2+l2 <= s1) | |
2763 | return 0; | |
2764 | return 1; | |
2765 | } | |
2766 | ||
b522adcd DW |
2767 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2768 | { | |
2769 | unsigned long long blocks; | |
2770 | sector_t new; | |
2771 | ||
b29bebd6 | 2772 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
2773 | return -EINVAL; |
2774 | ||
2775 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2776 | return -EINVAL; /* sector conversion overflow */ | |
2777 | ||
2778 | new = blocks * 2; | |
2779 | if (new != blocks * 2) | |
2780 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2781 | ||
2782 | *sectors = new; | |
2783 | return 0; | |
2784 | } | |
2785 | ||
83303b61 | 2786 | static ssize_t |
3cb03002 | 2787 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2788 | { |
fd01b88c | 2789 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2790 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2791 | sector_t sectors; |
27c529bb | 2792 | |
b522adcd | 2793 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2794 | return -EINVAL; |
c6563a8c N |
2795 | if (rdev->data_offset != rdev->new_data_offset) |
2796 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2797 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2798 | if (my_mddev->persistent) { |
dd8ac336 AN |
2799 | sectors = super_types[my_mddev->major_version]. |
2800 | rdev_size_change(rdev, sectors); | |
2801 | if (!sectors) | |
0cd17fec | 2802 | return -EBUSY; |
dd8ac336 | 2803 | } else if (!sectors) |
77304d2a | 2804 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2805 | rdev->data_offset; |
a6468539 N |
2806 | if (!my_mddev->pers->resize) |
2807 | /* Cannot change size for RAID0 or Linear etc */ | |
2808 | return -EINVAL; | |
0cd17fec | 2809 | } |
dd8ac336 | 2810 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2811 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2812 | |
dd8ac336 AN |
2813 | rdev->sectors = sectors; |
2814 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
2815 | /* Need to check that all other rdevs with the same |
2816 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
2817 | * the rdev lists safely. | |
2818 | * This check does not provide a hard guarantee, it | |
2819 | * just helps avoid dangerous mistakes. | |
c5d79adb | 2820 | */ |
fd01b88c | 2821 | struct mddev *mddev; |
c5d79adb | 2822 | int overlap = 0; |
159ec1fc | 2823 | struct list_head *tmp; |
c5d79adb | 2824 | |
8b1afc3d | 2825 | rcu_read_lock(); |
29ac4aa3 | 2826 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2827 | struct md_rdev *rdev2; |
c5d79adb | 2828 | |
dafb20fa | 2829 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
2830 | if (rdev->bdev == rdev2->bdev && |
2831 | rdev != rdev2 && | |
2832 | overlaps(rdev->data_offset, rdev->sectors, | |
2833 | rdev2->data_offset, | |
2834 | rdev2->sectors)) { | |
c5d79adb N |
2835 | overlap = 1; |
2836 | break; | |
2837 | } | |
c5d79adb N |
2838 | if (overlap) { |
2839 | mddev_put(mddev); | |
2840 | break; | |
2841 | } | |
2842 | } | |
8b1afc3d | 2843 | rcu_read_unlock(); |
c5d79adb N |
2844 | if (overlap) { |
2845 | /* Someone else could have slipped in a size | |
2846 | * change here, but doing so is just silly. | |
dd8ac336 | 2847 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2848 | * safe, and trust userspace not to race with |
2849 | * itself | |
2850 | */ | |
dd8ac336 | 2851 | rdev->sectors = oldsectors; |
c5d79adb N |
2852 | return -EBUSY; |
2853 | } | |
2854 | } | |
83303b61 N |
2855 | return len; |
2856 | } | |
2857 | ||
2858 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2859 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2860 | |
3cb03002 | 2861 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
2862 | { |
2863 | unsigned long long recovery_start = rdev->recovery_offset; | |
2864 | ||
2865 | if (test_bit(In_sync, &rdev->flags) || | |
2866 | recovery_start == MaxSector) | |
2867 | return sprintf(page, "none\n"); | |
2868 | ||
2869 | return sprintf(page, "%llu\n", recovery_start); | |
2870 | } | |
2871 | ||
3cb03002 | 2872 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
2873 | { |
2874 | unsigned long long recovery_start; | |
2875 | ||
2876 | if (cmd_match(buf, "none")) | |
2877 | recovery_start = MaxSector; | |
b29bebd6 | 2878 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
2879 | return -EINVAL; |
2880 | ||
2881 | if (rdev->mddev->pers && | |
2882 | rdev->raid_disk >= 0) | |
2883 | return -EBUSY; | |
2884 | ||
2885 | rdev->recovery_offset = recovery_start; | |
2886 | if (recovery_start == MaxSector) | |
2887 | set_bit(In_sync, &rdev->flags); | |
2888 | else | |
2889 | clear_bit(In_sync, &rdev->flags); | |
2890 | return len; | |
2891 | } | |
2892 | ||
2893 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2894 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2895 | ||
16c791a5 N |
2896 | static ssize_t |
2897 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2898 | static ssize_t | |
2899 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2900 | ||
3cb03002 | 2901 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2902 | { |
2903 | return badblocks_show(&rdev->badblocks, page, 0); | |
2904 | } | |
3cb03002 | 2905 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 2906 | { |
de393cde N |
2907 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
2908 | /* Maybe that ack was all we needed */ | |
2909 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
2910 | wake_up(&rdev->blocked_wait); | |
2911 | return rv; | |
16c791a5 N |
2912 | } |
2913 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2914 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2915 | ||
3cb03002 | 2916 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2917 | { |
2918 | return badblocks_show(&rdev->badblocks, page, 1); | |
2919 | } | |
3cb03002 | 2920 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
2921 | { |
2922 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2923 | } | |
2924 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
2925 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
2926 | ||
86e6ffdd N |
2927 | static struct attribute *rdev_default_attrs[] = { |
2928 | &rdev_state.attr, | |
4dbcdc75 | 2929 | &rdev_errors.attr, |
014236d2 | 2930 | &rdev_slot.attr, |
93c8cad0 | 2931 | &rdev_offset.attr, |
c6563a8c | 2932 | &rdev_new_offset.attr, |
83303b61 | 2933 | &rdev_size.attr, |
06e3c817 | 2934 | &rdev_recovery_start.attr, |
16c791a5 N |
2935 | &rdev_bad_blocks.attr, |
2936 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
2937 | NULL, |
2938 | }; | |
2939 | static ssize_t | |
2940 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2941 | { | |
2942 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2943 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
fd01b88c | 2944 | struct mddev *mddev = rdev->mddev; |
27c529bb | 2945 | ssize_t rv; |
86e6ffdd N |
2946 | |
2947 | if (!entry->show) | |
2948 | return -EIO; | |
27c529bb N |
2949 | |
2950 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2951 | if (!rv) { | |
2952 | if (rdev->mddev == NULL) | |
2953 | rv = -EBUSY; | |
2954 | else | |
2955 | rv = entry->show(rdev, page); | |
2956 | mddev_unlock(mddev); | |
2957 | } | |
2958 | return rv; | |
86e6ffdd N |
2959 | } |
2960 | ||
2961 | static ssize_t | |
2962 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2963 | const char *page, size_t length) | |
2964 | { | |
2965 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2966 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 2967 | ssize_t rv; |
fd01b88c | 2968 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
2969 | |
2970 | if (!entry->store) | |
2971 | return -EIO; | |
67463acb N |
2972 | if (!capable(CAP_SYS_ADMIN)) |
2973 | return -EACCES; | |
27c529bb | 2974 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2975 | if (!rv) { |
27c529bb N |
2976 | if (rdev->mddev == NULL) |
2977 | rv = -EBUSY; | |
2978 | else | |
2979 | rv = entry->store(rdev, page, length); | |
6a51830e | 2980 | mddev_unlock(mddev); |
ca388059 N |
2981 | } |
2982 | return rv; | |
86e6ffdd N |
2983 | } |
2984 | ||
2985 | static void rdev_free(struct kobject *ko) | |
2986 | { | |
3cb03002 | 2987 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
2988 | kfree(rdev); |
2989 | } | |
52cf25d0 | 2990 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2991 | .show = rdev_attr_show, |
2992 | .store = rdev_attr_store, | |
2993 | }; | |
2994 | static struct kobj_type rdev_ktype = { | |
2995 | .release = rdev_free, | |
2996 | .sysfs_ops = &rdev_sysfs_ops, | |
2997 | .default_attrs = rdev_default_attrs, | |
2998 | }; | |
2999 | ||
3cb03002 | 3000 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3001 | { |
3002 | rdev->desc_nr = -1; | |
3003 | rdev->saved_raid_disk = -1; | |
3004 | rdev->raid_disk = -1; | |
3005 | rdev->flags = 0; | |
3006 | rdev->data_offset = 0; | |
c6563a8c | 3007 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3008 | rdev->sb_events = 0; |
3009 | rdev->last_read_error.tv_sec = 0; | |
3010 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3011 | rdev->sb_loaded = 0; |
3012 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3013 | atomic_set(&rdev->nr_pending, 0); |
3014 | atomic_set(&rdev->read_errors, 0); | |
3015 | atomic_set(&rdev->corrected_errors, 0); | |
3016 | ||
3017 | INIT_LIST_HEAD(&rdev->same_set); | |
3018 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3019 | |
3020 | /* Add space to store bad block list. | |
3021 | * This reserves the space even on arrays where it cannot | |
3022 | * be used - I wonder if that matters | |
3023 | */ | |
3024 | rdev->badblocks.count = 0; | |
486adf72 | 3025 | rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
2230dfe4 N |
3026 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3027 | seqlock_init(&rdev->badblocks.lock); | |
3028 | if (rdev->badblocks.page == NULL) | |
3029 | return -ENOMEM; | |
3030 | ||
3031 | return 0; | |
e8bb9a83 N |
3032 | } |
3033 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3034 | /* |
3035 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3036 | * | |
3037 | * mark the device faulty if: | |
3038 | * | |
3039 | * - the device is nonexistent (zero size) | |
3040 | * - the device has no valid superblock | |
3041 | * | |
3042 | * a faulty rdev _never_ has rdev->sb set. | |
3043 | */ | |
3cb03002 | 3044 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3045 | { |
3046 | char b[BDEVNAME_SIZE]; | |
3047 | int err; | |
3cb03002 | 3048 | struct md_rdev *rdev; |
1da177e4 LT |
3049 | sector_t size; |
3050 | ||
9ffae0cf | 3051 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3052 | if (!rdev) { |
3053 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3054 | return ERR_PTR(-ENOMEM); | |
3055 | } | |
1da177e4 | 3056 | |
2230dfe4 N |
3057 | err = md_rdev_init(rdev); |
3058 | if (err) | |
3059 | goto abort_free; | |
3060 | err = alloc_disk_sb(rdev); | |
3061 | if (err) | |
1da177e4 LT |
3062 | goto abort_free; |
3063 | ||
c5d79adb | 3064 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3065 | if (err) |
3066 | goto abort_free; | |
3067 | ||
f9cb074b | 3068 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3069 | |
77304d2a | 3070 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3071 | if (!size) { |
f72ffdd6 | 3072 | printk(KERN_WARNING |
1da177e4 LT |
3073 | "md: %s has zero or unknown size, marking faulty!\n", |
3074 | bdevname(rdev->bdev,b)); | |
3075 | err = -EINVAL; | |
3076 | goto abort_free; | |
3077 | } | |
3078 | ||
3079 | if (super_format >= 0) { | |
3080 | err = super_types[super_format]. | |
3081 | load_super(rdev, NULL, super_minor); | |
3082 | if (err == -EINVAL) { | |
df968c4e N |
3083 | printk(KERN_WARNING |
3084 | "md: %s does not have a valid v%d.%d " | |
3085 | "superblock, not importing!\n", | |
3086 | bdevname(rdev->bdev,b), | |
3087 | super_format, super_minor); | |
1da177e4 LT |
3088 | goto abort_free; |
3089 | } | |
3090 | if (err < 0) { | |
f72ffdd6 | 3091 | printk(KERN_WARNING |
1da177e4 LT |
3092 | "md: could not read %s's sb, not importing!\n", |
3093 | bdevname(rdev->bdev,b)); | |
3094 | goto abort_free; | |
3095 | } | |
3096 | } | |
6bfe0b49 | 3097 | |
1da177e4 LT |
3098 | return rdev; |
3099 | ||
3100 | abort_free: | |
2699b672 N |
3101 | if (rdev->bdev) |
3102 | unlock_rdev(rdev); | |
545c8795 | 3103 | md_rdev_clear(rdev); |
1da177e4 LT |
3104 | kfree(rdev); |
3105 | return ERR_PTR(err); | |
3106 | } | |
3107 | ||
3108 | /* | |
3109 | * Check a full RAID array for plausibility | |
3110 | */ | |
3111 | ||
f72ffdd6 | 3112 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3113 | { |
3114 | int i; | |
3cb03002 | 3115 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3116 | char b[BDEVNAME_SIZE]; |
3117 | ||
3118 | freshest = NULL; | |
dafb20fa | 3119 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3120 | switch (super_types[mddev->major_version]. |
3121 | load_super(rdev, freshest, mddev->minor_version)) { | |
3122 | case 1: | |
3123 | freshest = rdev; | |
3124 | break; | |
3125 | case 0: | |
3126 | break; | |
3127 | default: | |
3128 | printk( KERN_ERR \ | |
3129 | "md: fatal superblock inconsistency in %s" | |
f72ffdd6 | 3130 | " -- removing from array\n", |
1da177e4 LT |
3131 | bdevname(rdev->bdev,b)); |
3132 | kick_rdev_from_array(rdev); | |
3133 | } | |
3134 | ||
1da177e4 LT |
3135 | super_types[mddev->major_version]. |
3136 | validate_super(mddev, freshest); | |
3137 | ||
3138 | i = 0; | |
dafb20fa | 3139 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3140 | if (mddev->max_disks && |
3141 | (rdev->desc_nr >= mddev->max_disks || | |
3142 | i > mddev->max_disks)) { | |
de01dfad N |
3143 | printk(KERN_WARNING |
3144 | "md: %s: %s: only %d devices permitted\n", | |
3145 | mdname(mddev), bdevname(rdev->bdev, b), | |
3146 | mddev->max_disks); | |
3147 | kick_rdev_from_array(rdev); | |
3148 | continue; | |
3149 | } | |
1da177e4 LT |
3150 | if (rdev != freshest) |
3151 | if (super_types[mddev->major_version]. | |
3152 | validate_super(mddev, rdev)) { | |
3153 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3154 | " from array!\n", | |
3155 | bdevname(rdev->bdev,b)); | |
3156 | kick_rdev_from_array(rdev); | |
3157 | continue; | |
3158 | } | |
3159 | if (mddev->level == LEVEL_MULTIPATH) { | |
3160 | rdev->desc_nr = i++; | |
3161 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3162 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3163 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3164 | rdev->raid_disk = -1; |
3165 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3166 | } |
3167 | } | |
1da177e4 LT |
3168 | } |
3169 | ||
72e02075 N |
3170 | /* Read a fixed-point number. |
3171 | * Numbers in sysfs attributes should be in "standard" units where | |
3172 | * possible, so time should be in seconds. | |
f72ffdd6 | 3173 | * However we internally use a a much smaller unit such as |
72e02075 N |
3174 | * milliseconds or jiffies. |
3175 | * This function takes a decimal number with a possible fractional | |
3176 | * component, and produces an integer which is the result of | |
3177 | * multiplying that number by 10^'scale'. | |
3178 | * all without any floating-point arithmetic. | |
3179 | */ | |
3180 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3181 | { | |
3182 | unsigned long result = 0; | |
3183 | long decimals = -1; | |
3184 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3185 | if (*cp == '.') | |
3186 | decimals = 0; | |
3187 | else if (decimals < scale) { | |
3188 | unsigned int value; | |
3189 | value = *cp - '0'; | |
3190 | result = result * 10 + value; | |
3191 | if (decimals >= 0) | |
3192 | decimals++; | |
3193 | } | |
3194 | cp++; | |
3195 | } | |
3196 | if (*cp == '\n') | |
3197 | cp++; | |
3198 | if (*cp) | |
3199 | return -EINVAL; | |
3200 | if (decimals < 0) | |
3201 | decimals = 0; | |
3202 | while (decimals < scale) { | |
3203 | result *= 10; | |
3204 | decimals ++; | |
3205 | } | |
3206 | *res = result; | |
3207 | return 0; | |
3208 | } | |
3209 | ||
19052c0e N |
3210 | static void md_safemode_timeout(unsigned long data); |
3211 | ||
16f17b39 | 3212 | static ssize_t |
fd01b88c | 3213 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3214 | { |
3215 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3216 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3217 | } | |
3218 | static ssize_t | |
fd01b88c | 3219 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3220 | { |
16f17b39 | 3221 | unsigned long msec; |
97ce0a7f | 3222 | |
72e02075 | 3223 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3224 | return -EINVAL; |
16f17b39 N |
3225 | if (msec == 0) |
3226 | mddev->safemode_delay = 0; | |
3227 | else { | |
19052c0e | 3228 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
3229 | mddev->safemode_delay = (msec*HZ)/1000; |
3230 | if (mddev->safemode_delay == 0) | |
3231 | mddev->safemode_delay = 1; | |
275c51c4 | 3232 | if (mddev->safemode_delay < old_delay || old_delay == 0) |
19052c0e | 3233 | md_safemode_timeout((unsigned long)mddev); |
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 | { |
84fc4b56 | 3243 | struct md_personality *p = mddev->pers; |
d9d166c2 | 3244 | if (p) |
eae1701f | 3245 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
3246 | else if (mddev->clevel[0]) |
3247 | return sprintf(page, "%s\n", mddev->clevel); | |
3248 | else if (mddev->level != LEVEL_NONE) | |
3249 | return sprintf(page, "%d\n", mddev->level); | |
3250 | else | |
3251 | return 0; | |
eae1701f N |
3252 | } |
3253 | ||
d9d166c2 | 3254 | static ssize_t |
fd01b88c | 3255 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3256 | { |
f2859af6 | 3257 | char clevel[16]; |
20a49ff6 | 3258 | ssize_t rv = len; |
84fc4b56 | 3259 | struct md_personality *pers; |
f2859af6 | 3260 | long level; |
245f46c2 | 3261 | void *priv; |
3cb03002 | 3262 | struct md_rdev *rdev; |
245f46c2 N |
3263 | |
3264 | if (mddev->pers == NULL) { | |
3265 | if (len == 0) | |
3266 | return 0; | |
3267 | if (len >= sizeof(mddev->clevel)) | |
3268 | return -ENOSPC; | |
3269 | strncpy(mddev->clevel, buf, len); | |
3270 | if (mddev->clevel[len-1] == '\n') | |
3271 | len--; | |
3272 | mddev->clevel[len] = 0; | |
3273 | mddev->level = LEVEL_NONE; | |
3274 | return rv; | |
3275 | } | |
bd8839e0 N |
3276 | if (mddev->ro) |
3277 | return -EROFS; | |
245f46c2 N |
3278 | |
3279 | /* request to change the personality. Need to ensure: | |
3280 | * - array is not engaged in resync/recovery/reshape | |
3281 | * - old personality can be suspended | |
3282 | * - new personality will access other array. | |
3283 | */ | |
3284 | ||
bb4f1e9d | 3285 | if (mddev->sync_thread || |
f851b60d | 3286 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3287 | mddev->reshape_position != MaxSector || |
3288 | mddev->sysfs_active) | |
d9d166c2 | 3289 | return -EBUSY; |
245f46c2 N |
3290 | |
3291 | if (!mddev->pers->quiesce) { | |
3292 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3293 | mdname(mddev), mddev->pers->name); | |
3294 | return -EINVAL; | |
3295 | } | |
3296 | ||
3297 | /* Now find the new personality */ | |
f2859af6 | 3298 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3299 | return -EINVAL; |
f2859af6 DW |
3300 | strncpy(clevel, buf, len); |
3301 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3302 | len--; |
f2859af6 | 3303 | clevel[len] = 0; |
b29bebd6 | 3304 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3305 | level = LEVEL_NONE; |
245f46c2 | 3306 | |
f2859af6 DW |
3307 | if (request_module("md-%s", clevel) != 0) |
3308 | request_module("md-level-%s", clevel); | |
245f46c2 | 3309 | spin_lock(&pers_lock); |
f2859af6 | 3310 | pers = find_pers(level, clevel); |
245f46c2 N |
3311 | if (!pers || !try_module_get(pers->owner)) { |
3312 | spin_unlock(&pers_lock); | |
f2859af6 | 3313 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3314 | return -EINVAL; |
3315 | } | |
3316 | spin_unlock(&pers_lock); | |
3317 | ||
3318 | if (pers == mddev->pers) { | |
3319 | /* Nothing to do! */ | |
3320 | module_put(pers->owner); | |
3321 | return rv; | |
3322 | } | |
3323 | if (!pers->takeover) { | |
3324 | module_put(pers->owner); | |
3325 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3326 | mdname(mddev), clevel); |
245f46c2 N |
3327 | return -EINVAL; |
3328 | } | |
3329 | ||
dafb20fa | 3330 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3331 | rdev->new_raid_disk = rdev->raid_disk; |
3332 | ||
245f46c2 N |
3333 | /* ->takeover must set new_* and/or delta_disks |
3334 | * if it succeeds, and may set them when it fails. | |
3335 | */ | |
3336 | priv = pers->takeover(mddev); | |
3337 | if (IS_ERR(priv)) { | |
3338 | mddev->new_level = mddev->level; | |
3339 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3340 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3341 | mddev->raid_disks -= mddev->delta_disks; |
3342 | mddev->delta_disks = 0; | |
2c810cdd | 3343 | mddev->reshape_backwards = 0; |
245f46c2 N |
3344 | module_put(pers->owner); |
3345 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3346 | mdname(mddev), clevel); |
245f46c2 N |
3347 | return PTR_ERR(priv); |
3348 | } | |
3349 | ||
3350 | /* Looks like we have a winner */ | |
3351 | mddev_suspend(mddev); | |
3352 | mddev->pers->stop(mddev); | |
f72ffdd6 | 3353 | |
a64c876f N |
3354 | if (mddev->pers->sync_request == NULL && |
3355 | pers->sync_request != NULL) { | |
3356 | /* need to add the md_redundancy_group */ | |
3357 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3358 | printk(KERN_WARNING | |
3359 | "md: cannot register extra attributes for %s\n", | |
3360 | mdname(mddev)); | |
388975cc | 3361 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3362 | } |
a64c876f N |
3363 | if (mddev->pers->sync_request != NULL && |
3364 | pers->sync_request == NULL) { | |
3365 | /* need to remove the md_redundancy_group */ | |
3366 | if (mddev->to_remove == NULL) | |
3367 | mddev->to_remove = &md_redundancy_group; | |
3368 | } | |
3369 | ||
54071b38 TM |
3370 | if (mddev->pers->sync_request == NULL && |
3371 | mddev->external) { | |
3372 | /* We are converting from a no-redundancy array | |
3373 | * to a redundancy array and metadata is managed | |
3374 | * externally so we need to be sure that writes | |
3375 | * won't block due to a need to transition | |
3376 | * clean->dirty | |
3377 | * until external management is started. | |
3378 | */ | |
3379 | mddev->in_sync = 0; | |
3380 | mddev->safemode_delay = 0; | |
3381 | mddev->safemode = 0; | |
3382 | } | |
3383 | ||
dafb20fa | 3384 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3385 | if (rdev->raid_disk < 0) |
3386 | continue; | |
bf2cb0da | 3387 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3388 | rdev->new_raid_disk = -1; |
3389 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3390 | continue; | |
36fad858 | 3391 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3392 | } |
dafb20fa | 3393 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3394 | if (rdev->raid_disk < 0) |
3395 | continue; | |
3396 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3397 | continue; | |
3398 | rdev->raid_disk = rdev->new_raid_disk; | |
3399 | if (rdev->raid_disk < 0) | |
3a981b03 | 3400 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3401 | else { |
36fad858 NK |
3402 | if (sysfs_link_rdev(mddev, rdev)) |
3403 | printk(KERN_WARNING "md: cannot register rd%d" | |
3404 | " for %s after level change\n", | |
3405 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3406 | } |
e93f68a1 N |
3407 | } |
3408 | ||
3409 | module_put(mddev->pers->owner); | |
245f46c2 N |
3410 | mddev->pers = pers; |
3411 | mddev->private = priv; | |
3412 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3413 | mddev->level = mddev->new_level; | |
3414 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3415 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3416 | mddev->delta_disks = 0; |
2c810cdd | 3417 | mddev->reshape_backwards = 0; |
fee68723 | 3418 | mddev->degraded = 0; |
9af204cf TM |
3419 | if (mddev->pers->sync_request == NULL) { |
3420 | /* this is now an array without redundancy, so | |
3421 | * it must always be in_sync | |
3422 | */ | |
3423 | mddev->in_sync = 1; | |
3424 | del_timer_sync(&mddev->safemode_timer); | |
3425 | } | |
02e5f5c0 | 3426 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3427 | pers->run(mddev); |
245f46c2 | 3428 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3429 | mddev_resume(mddev); |
830778a1 N |
3430 | if (!mddev->thread) |
3431 | md_update_sb(mddev, 1); | |
5cac7861 | 3432 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3433 | md_new_event(mddev); |
d9d166c2 N |
3434 | return rv; |
3435 | } | |
3436 | ||
3437 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3438 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3439 | |
d4dbd025 | 3440 | static ssize_t |
fd01b88c | 3441 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3442 | { |
3443 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3444 | if (mddev->reshape_position != MaxSector && |
3445 | mddev->layout != mddev->new_layout) | |
3446 | return sprintf(page, "%d (%d)\n", | |
3447 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3448 | return sprintf(page, "%d\n", mddev->layout); |
3449 | } | |
3450 | ||
3451 | static ssize_t | |
fd01b88c | 3452 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 N |
3453 | { |
3454 | char *e; | |
3455 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3456 | |
3457 | if (!*buf || (*e && *e != '\n')) | |
3458 | return -EINVAL; | |
3459 | ||
b3546035 N |
3460 | if (mddev->pers) { |
3461 | int err; | |
50ac168a | 3462 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3463 | return -EBUSY; |
bd8839e0 N |
3464 | if (mddev->ro) |
3465 | return -EROFS; | |
597a711b | 3466 | mddev->new_layout = n; |
50ac168a | 3467 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3468 | if (err) { |
3469 | mddev->new_layout = mddev->layout; | |
b3546035 | 3470 | return err; |
597a711b | 3471 | } |
b3546035 | 3472 | } else { |
08a02ecd | 3473 | mddev->new_layout = n; |
b3546035 N |
3474 | if (mddev->reshape_position == MaxSector) |
3475 | mddev->layout = n; | |
3476 | } | |
d4dbd025 N |
3477 | return len; |
3478 | } | |
3479 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3480 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3481 | |
eae1701f | 3482 | static ssize_t |
fd01b88c | 3483 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3484 | { |
bb636547 N |
3485 | if (mddev->raid_disks == 0) |
3486 | return 0; | |
08a02ecd N |
3487 | if (mddev->reshape_position != MaxSector && |
3488 | mddev->delta_disks != 0) | |
3489 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3490 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3491 | return sprintf(page, "%d\n", mddev->raid_disks); |
3492 | } | |
3493 | ||
fd01b88c | 3494 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3495 | |
3496 | static ssize_t | |
fd01b88c | 3497 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3498 | { |
da943b99 N |
3499 | char *e; |
3500 | int rv = 0; | |
3501 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3502 | ||
3503 | if (!*buf || (*e && *e != '\n')) | |
3504 | return -EINVAL; | |
3505 | ||
3506 | if (mddev->pers) | |
3507 | rv = update_raid_disks(mddev, n); | |
08a02ecd | 3508 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3509 | struct md_rdev *rdev; |
08a02ecd | 3510 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c N |
3511 | |
3512 | rdev_for_each(rdev, mddev) { | |
3513 | if (olddisks < n && | |
3514 | rdev->data_offset < rdev->new_data_offset) | |
3515 | return -EINVAL; | |
3516 | if (olddisks > n && | |
3517 | rdev->data_offset > rdev->new_data_offset) | |
3518 | return -EINVAL; | |
3519 | } | |
08a02ecd N |
3520 | mddev->delta_disks = n - olddisks; |
3521 | mddev->raid_disks = n; | |
2c810cdd | 3522 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3523 | } else |
da943b99 N |
3524 | mddev->raid_disks = n; |
3525 | return rv ? rv : len; | |
3526 | } | |
3527 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3528 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3529 | |
3b34380a | 3530 | static ssize_t |
fd01b88c | 3531 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3532 | { |
08a02ecd | 3533 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3534 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3535 | return sprintf(page, "%d (%d)\n", | |
3536 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3537 | mddev->chunk_sectors << 9); |
3538 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3539 | } |
3540 | ||
3541 | static ssize_t | |
fd01b88c | 3542 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3543 | { |
3b34380a N |
3544 | char *e; |
3545 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3546 | ||
3b34380a N |
3547 | if (!*buf || (*e && *e != '\n')) |
3548 | return -EINVAL; | |
3549 | ||
b3546035 N |
3550 | if (mddev->pers) { |
3551 | int err; | |
50ac168a | 3552 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3553 | return -EBUSY; |
bd8839e0 N |
3554 | if (mddev->ro) |
3555 | return -EROFS; | |
597a711b | 3556 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3557 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3558 | if (err) { |
3559 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3560 | return err; |
597a711b | 3561 | } |
b3546035 | 3562 | } else { |
664e7c41 | 3563 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3564 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3565 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3566 | } |
3b34380a N |
3567 | return len; |
3568 | } | |
3569 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3570 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3571 | |
a94213b1 | 3572 | static ssize_t |
fd01b88c | 3573 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3574 | { |
d1a7c503 N |
3575 | if (mddev->recovery_cp == MaxSector) |
3576 | return sprintf(page, "none\n"); | |
a94213b1 N |
3577 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3578 | } | |
3579 | ||
3580 | static ssize_t | |
fd01b88c | 3581 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3582 | { |
a94213b1 N |
3583 | char *e; |
3584 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3585 | ||
b098636c | 3586 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3587 | return -EBUSY; |
06e3c817 DW |
3588 | if (cmd_match(buf, "none")) |
3589 | n = MaxSector; | |
3590 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3591 | return -EINVAL; |
3592 | ||
3593 | mddev->recovery_cp = n; | |
db07d85e N |
3594 | if (mddev->pers) |
3595 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
a94213b1 N |
3596 | return len; |
3597 | } | |
3598 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3599 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3600 | |
9e653b63 N |
3601 | /* |
3602 | * The array state can be: | |
3603 | * | |
3604 | * clear | |
3605 | * No devices, no size, no level | |
3606 | * Equivalent to STOP_ARRAY ioctl | |
3607 | * inactive | |
3608 | * May have some settings, but array is not active | |
3609 | * all IO results in error | |
3610 | * When written, doesn't tear down array, but just stops it | |
3611 | * suspended (not supported yet) | |
3612 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3613 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3614 | * readonly |
3615 | * no resync can happen. no superblocks get written. | |
3616 | * write requests fail | |
3617 | * read-auto | |
3618 | * like readonly, but behaves like 'clean' on a write request. | |
3619 | * | |
3620 | * clean - no pending writes, but otherwise active. | |
3621 | * When written to inactive array, starts without resync | |
3622 | * If a write request arrives then | |
3623 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3624 | * if not known, block and switch to write-pending | |
3625 | * If written to an active array that has pending writes, then fails. | |
3626 | * active | |
3627 | * fully active: IO and resync can be happening. | |
3628 | * When written to inactive array, starts with resync | |
3629 | * | |
3630 | * write-pending | |
3631 | * clean, but writes are blocked waiting for 'active' to be written. | |
3632 | * | |
3633 | * active-idle | |
3634 | * like active, but no writes have been seen for a while (100msec). | |
3635 | * | |
3636 | */ | |
3637 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3638 | write_pending, active_idle, bad_word}; | |
05381954 | 3639 | static char *array_states[] = { |
9e653b63 N |
3640 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3641 | "write-pending", "active-idle", NULL }; | |
3642 | ||
3643 | static int match_word(const char *word, char **list) | |
3644 | { | |
3645 | int n; | |
3646 | for (n=0; list[n]; n++) | |
3647 | if (cmd_match(word, list[n])) | |
3648 | break; | |
3649 | return n; | |
3650 | } | |
3651 | ||
3652 | static ssize_t | |
fd01b88c | 3653 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3654 | { |
3655 | enum array_state st = inactive; | |
3656 | ||
3657 | if (mddev->pers) | |
3658 | switch(mddev->ro) { | |
3659 | case 1: | |
3660 | st = readonly; | |
3661 | break; | |
3662 | case 2: | |
3663 | st = read_auto; | |
3664 | break; | |
3665 | case 0: | |
3666 | if (mddev->in_sync) | |
3667 | st = clean; | |
070dc6dd | 3668 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3669 | st = write_pending; |
9e653b63 N |
3670 | else if (mddev->safemode) |
3671 | st = active_idle; | |
3672 | else | |
3673 | st = active; | |
3674 | } | |
3675 | else { | |
3676 | if (list_empty(&mddev->disks) && | |
3677 | mddev->raid_disks == 0 && | |
58c0fed4 | 3678 | mddev->dev_sectors == 0) |
9e653b63 N |
3679 | st = clear; |
3680 | else | |
3681 | st = inactive; | |
3682 | } | |
3683 | return sprintf(page, "%s\n", array_states[st]); | |
3684 | } | |
3685 | ||
f72ffdd6 N |
3686 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
3687 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
3688 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 3689 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
3690 | |
3691 | static ssize_t | |
fd01b88c | 3692 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 N |
3693 | { |
3694 | int err = -EINVAL; | |
3695 | enum array_state st = match_word(buf, array_states); | |
3696 | switch(st) { | |
3697 | case bad_word: | |
3698 | break; | |
3699 | case clear: | |
3700 | /* stopping an active array */ | |
a05b7ea0 | 3701 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3702 | break; |
3703 | case inactive: | |
3704 | /* stopping an active array */ | |
90cf195d | 3705 | if (mddev->pers) |
a05b7ea0 | 3706 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3707 | else |
e691063a | 3708 | err = 0; /* already inactive */ |
9e653b63 N |
3709 | break; |
3710 | case suspended: | |
3711 | break; /* not supported yet */ | |
3712 | case readonly: | |
3713 | if (mddev->pers) | |
a05b7ea0 | 3714 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3715 | else { |
3716 | mddev->ro = 1; | |
648b629e | 3717 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3718 | err = do_md_run(mddev); |
3719 | } | |
3720 | break; | |
3721 | case read_auto: | |
9e653b63 | 3722 | if (mddev->pers) { |
80268ee9 | 3723 | if (mddev->ro == 0) |
a05b7ea0 | 3724 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3725 | else if (mddev->ro == 1) |
648b629e N |
3726 | err = restart_array(mddev); |
3727 | if (err == 0) { | |
3728 | mddev->ro = 2; | |
3729 | set_disk_ro(mddev->gendisk, 0); | |
3730 | } | |
9e653b63 N |
3731 | } else { |
3732 | mddev->ro = 2; | |
3733 | err = do_md_run(mddev); | |
3734 | } | |
3735 | break; | |
3736 | case clean: | |
3737 | if (mddev->pers) { | |
3738 | restart_array(mddev); | |
85572d7c | 3739 | spin_lock(&mddev->lock); |
9e653b63 | 3740 | if (atomic_read(&mddev->writes_pending) == 0) { |
e691063a N |
3741 | if (mddev->in_sync == 0) { |
3742 | mddev->in_sync = 1; | |
31a59e34 N |
3743 | if (mddev->safemode == 1) |
3744 | mddev->safemode = 0; | |
070dc6dd | 3745 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3746 | } |
3747 | err = 0; | |
3748 | } else | |
3749 | err = -EBUSY; | |
85572d7c | 3750 | spin_unlock(&mddev->lock); |
5bf29597 N |
3751 | } else |
3752 | err = -EINVAL; | |
9e653b63 N |
3753 | break; |
3754 | case active: | |
3755 | if (mddev->pers) { | |
3756 | restart_array(mddev); | |
070dc6dd | 3757 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3758 | wake_up(&mddev->sb_wait); |
3759 | err = 0; | |
3760 | } else { | |
3761 | mddev->ro = 0; | |
648b629e | 3762 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3763 | err = do_md_run(mddev); |
3764 | } | |
3765 | break; | |
3766 | case write_pending: | |
3767 | case active_idle: | |
3768 | /* these cannot be set */ | |
3769 | break; | |
3770 | } | |
3771 | if (err) | |
3772 | return err; | |
0fd62b86 | 3773 | else { |
1d23f178 N |
3774 | if (mddev->hold_active == UNTIL_IOCTL) |
3775 | mddev->hold_active = 0; | |
00bcb4ac | 3776 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3777 | return len; |
0fd62b86 | 3778 | } |
9e653b63 | 3779 | } |
80ca3a44 N |
3780 | static struct md_sysfs_entry md_array_state = |
3781 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3782 | |
1e50915f | 3783 | static ssize_t |
fd01b88c | 3784 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3785 | return sprintf(page, "%d\n", |
3786 | atomic_read(&mddev->max_corr_read_errors)); | |
3787 | } | |
3788 | ||
3789 | static ssize_t | |
fd01b88c | 3790 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f RB |
3791 | { |
3792 | char *e; | |
3793 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3794 | ||
3795 | if (*buf && (*e == 0 || *e == '\n')) { | |
3796 | atomic_set(&mddev->max_corr_read_errors, n); | |
3797 | return len; | |
3798 | } | |
3799 | return -EINVAL; | |
3800 | } | |
3801 | ||
3802 | static struct md_sysfs_entry max_corr_read_errors = | |
3803 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3804 | max_corrected_read_errors_store); | |
3805 | ||
6d7ff738 | 3806 | static ssize_t |
fd01b88c | 3807 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3808 | { |
3809 | return -EINVAL; | |
3810 | } | |
3811 | ||
3812 | static ssize_t | |
fd01b88c | 3813 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
3814 | { |
3815 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3816 | /* The new device is added to the array. | |
3817 | * If the array has a persistent superblock, we read the | |
3818 | * superblock to initialise info and check validity. | |
3819 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3820 | * which mainly checks size. | |
3821 | */ | |
3822 | char *e; | |
3823 | int major = simple_strtoul(buf, &e, 10); | |
3824 | int minor; | |
3825 | dev_t dev; | |
3cb03002 | 3826 | struct md_rdev *rdev; |
6d7ff738 N |
3827 | int err; |
3828 | ||
3829 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3830 | return -EINVAL; | |
3831 | minor = simple_strtoul(e+1, &e, 10); | |
3832 | if (*e && *e != '\n') | |
3833 | return -EINVAL; | |
3834 | dev = MKDEV(major, minor); | |
3835 | if (major != MAJOR(dev) || | |
3836 | minor != MINOR(dev)) | |
3837 | return -EOVERFLOW; | |
3838 | ||
6d7ff738 N |
3839 | if (mddev->persistent) { |
3840 | rdev = md_import_device(dev, mddev->major_version, | |
3841 | mddev->minor_version); | |
3842 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
3843 | struct md_rdev *rdev0 |
3844 | = list_entry(mddev->disks.next, | |
3845 | struct md_rdev, same_set); | |
6d7ff738 N |
3846 | err = super_types[mddev->major_version] |
3847 | .load_super(rdev, rdev0, mddev->minor_version); | |
3848 | if (err < 0) | |
3849 | goto out; | |
3850 | } | |
c5d79adb N |
3851 | } else if (mddev->external) |
3852 | rdev = md_import_device(dev, -2, -1); | |
3853 | else | |
6d7ff738 N |
3854 | rdev = md_import_device(dev, -1, -1); |
3855 | ||
3856 | if (IS_ERR(rdev)) | |
3857 | return PTR_ERR(rdev); | |
3858 | err = bind_rdev_to_array(rdev, mddev); | |
3859 | out: | |
3860 | if (err) | |
3861 | export_rdev(rdev); | |
3862 | return err ? err : len; | |
3863 | } | |
3864 | ||
3865 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3866 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3867 | |
9b1d1dac | 3868 | static ssize_t |
fd01b88c | 3869 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
3870 | { |
3871 | char *end; | |
3872 | unsigned long chunk, end_chunk; | |
3873 | ||
3874 | if (!mddev->bitmap) | |
3875 | goto out; | |
3876 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3877 | while (*buf) { | |
3878 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3879 | if (buf == end) break; | |
3880 | if (*end == '-') { /* range */ | |
3881 | buf = end + 1; | |
3882 | end_chunk = simple_strtoul(buf, &end, 0); | |
3883 | if (buf == end) break; | |
3884 | } | |
3885 | if (*end && !isspace(*end)) break; | |
3886 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3887 | buf = skip_spaces(end); |
9b1d1dac PC |
3888 | } |
3889 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3890 | out: | |
3891 | return len; | |
3892 | } | |
3893 | ||
3894 | static struct md_sysfs_entry md_bitmap = | |
3895 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3896 | ||
a35b0d69 | 3897 | static ssize_t |
fd01b88c | 3898 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 3899 | { |
58c0fed4 AN |
3900 | return sprintf(page, "%llu\n", |
3901 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3902 | } |
3903 | ||
fd01b88c | 3904 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
3905 | |
3906 | static ssize_t | |
fd01b88c | 3907 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
3908 | { |
3909 | /* If array is inactive, we can reduce the component size, but | |
3910 | * not increase it (except from 0). | |
3911 | * If array is active, we can try an on-line resize | |
3912 | */ | |
b522adcd DW |
3913 | sector_t sectors; |
3914 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3915 | |
58c0fed4 AN |
3916 | if (err < 0) |
3917 | return err; | |
a35b0d69 | 3918 | if (mddev->pers) { |
58c0fed4 | 3919 | err = update_size(mddev, sectors); |
850b2b42 | 3920 | md_update_sb(mddev, 1); |
a35b0d69 | 3921 | } else { |
58c0fed4 AN |
3922 | if (mddev->dev_sectors == 0 || |
3923 | mddev->dev_sectors > sectors) | |
3924 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3925 | else |
3926 | err = -ENOSPC; | |
3927 | } | |
3928 | return err ? err : len; | |
3929 | } | |
3930 | ||
3931 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3932 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3933 | |
83f0d77a | 3934 | /* Metadata version. |
e691063a N |
3935 | * This is one of |
3936 | * 'none' for arrays with no metadata (good luck...) | |
3937 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3938 | * or N.M for internally known formats |
3939 | */ | |
3940 | static ssize_t | |
fd01b88c | 3941 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
3942 | { |
3943 | if (mddev->persistent) | |
3944 | return sprintf(page, "%d.%d\n", | |
3945 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3946 | else if (mddev->external) |
3947 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3948 | else |
3949 | return sprintf(page, "none\n"); | |
3950 | } | |
3951 | ||
3952 | static ssize_t | |
fd01b88c | 3953 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
3954 | { |
3955 | int major, minor; | |
3956 | char *e; | |
ea43ddd8 N |
3957 | /* Changing the details of 'external' metadata is |
3958 | * always permitted. Otherwise there must be | |
3959 | * no devices attached to the array. | |
3960 | */ | |
3961 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3962 | ; | |
3963 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3964 | return -EBUSY; |
3965 | ||
3966 | if (cmd_match(buf, "none")) { | |
3967 | mddev->persistent = 0; | |
e691063a N |
3968 | mddev->external = 0; |
3969 | mddev->major_version = 0; | |
3970 | mddev->minor_version = 90; | |
3971 | return len; | |
3972 | } | |
3973 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3974 | size_t namelen = len-9; |
e691063a N |
3975 | if (namelen >= sizeof(mddev->metadata_type)) |
3976 | namelen = sizeof(mddev->metadata_type)-1; | |
3977 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3978 | mddev->metadata_type[namelen] = 0; | |
3979 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3980 | mddev->metadata_type[--namelen] = 0; | |
3981 | mddev->persistent = 0; | |
3982 | mddev->external = 1; | |
8bb93aac N |
3983 | mddev->major_version = 0; |
3984 | mddev->minor_version = 90; | |
3985 | return len; | |
3986 | } | |
3987 | major = simple_strtoul(buf, &e, 10); | |
3988 | if (e==buf || *e != '.') | |
3989 | return -EINVAL; | |
3990 | buf = e+1; | |
3991 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3992 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3993 | return -EINVAL; |
50511da3 | 3994 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3995 | return -ENOENT; |
3996 | mddev->major_version = major; | |
3997 | mddev->minor_version = minor; | |
3998 | mddev->persistent = 1; | |
e691063a | 3999 | mddev->external = 0; |
8bb93aac N |
4000 | return len; |
4001 | } | |
4002 | ||
4003 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 4004 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4005 | |
24dd469d | 4006 | static ssize_t |
fd01b88c | 4007 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4008 | { |
7eec314d | 4009 | char *type = "idle"; |
b6a9ce68 N |
4010 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
4011 | type = "frozen"; | |
4012 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 4013 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
4014 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4015 | type = "reshape"; | |
4016 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
4017 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
4018 | type = "resync"; | |
4019 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
4020 | type = "check"; | |
4021 | else | |
4022 | type = "repair"; | |
72a23c21 | 4023 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
4024 | type = "recover"; |
4025 | } | |
4026 | return sprintf(page, "%s\n", type); | |
4027 | } | |
4028 | ||
4029 | static ssize_t | |
fd01b88c | 4030 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4031 | { |
7eec314d N |
4032 | if (!mddev->pers || !mddev->pers->sync_request) |
4033 | return -EINVAL; | |
4034 | ||
b6a9ce68 N |
4035 | if (cmd_match(page, "frozen")) |
4036 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4037 | else | |
4038 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4039 | ||
4040 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
f851b60d | 4041 | flush_workqueue(md_misc_wq); |
7eec314d N |
4042 | if (mddev->sync_thread) { |
4043 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
a91d5ac0 | 4044 | md_reap_sync_thread(mddev); |
7eec314d | 4045 | } |
03c902e1 N |
4046 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4047 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4048 | return -EBUSY; |
72a23c21 NB |
4049 | else if (cmd_match(page, "resync")) |
4050 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4051 | else if (cmd_match(page, "recover")) { | |
4052 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4053 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4054 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4055 | int err; |
4056 | if (mddev->pers->start_reshape == NULL) | |
4057 | return -EINVAL; | |
4058 | err = mddev->pers->start_reshape(mddev); | |
4059 | if (err) | |
4060 | return err; | |
a99ac971 | 4061 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4062 | } else { |
bce74dac | 4063 | if (cmd_match(page, "check")) |
7eec314d | 4064 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4065 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4066 | return -EINVAL; |
4067 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4068 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4069 | } |
48c26ddc N |
4070 | if (mddev->ro == 2) { |
4071 | /* A write to sync_action is enough to justify | |
4072 | * canceling read-auto mode | |
4073 | */ | |
4074 | mddev->ro = 0; | |
4075 | md_wakeup_thread(mddev->sync_thread); | |
4076 | } | |
03c902e1 | 4077 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4078 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4079 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4080 | return len; |
4081 | } | |
4082 | ||
c4a39551 JB |
4083 | static struct md_sysfs_entry md_scan_mode = |
4084 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
4085 | ||
4086 | static ssize_t | |
4087 | last_sync_action_show(struct mddev *mddev, char *page) | |
4088 | { | |
4089 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4090 | } | |
4091 | ||
4092 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4093 | ||
9d88883e | 4094 | static ssize_t |
fd01b88c | 4095 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4096 | { |
4097 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4098 | (unsigned long long) |
4099 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4100 | } |
4101 | ||
80ca3a44 | 4102 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4103 | |
88202a0c | 4104 | static ssize_t |
fd01b88c | 4105 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4106 | { |
4107 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4108 | mddev->sync_speed_min ? "local": "system"); | |
4109 | } | |
4110 | ||
4111 | static ssize_t | |
fd01b88c | 4112 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4113 | { |
4114 | int min; | |
4115 | char *e; | |
4116 | if (strncmp(buf, "system", 6)==0) { | |
4117 | mddev->sync_speed_min = 0; | |
4118 | return len; | |
4119 | } | |
4120 | min = simple_strtoul(buf, &e, 10); | |
4121 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4122 | return -EINVAL; | |
4123 | mddev->sync_speed_min = min; | |
4124 | return len; | |
4125 | } | |
4126 | ||
4127 | static struct md_sysfs_entry md_sync_min = | |
4128 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4129 | ||
4130 | static ssize_t | |
fd01b88c | 4131 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4132 | { |
4133 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4134 | mddev->sync_speed_max ? "local": "system"); | |
4135 | } | |
4136 | ||
4137 | static ssize_t | |
fd01b88c | 4138 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4139 | { |
4140 | int max; | |
4141 | char *e; | |
4142 | if (strncmp(buf, "system", 6)==0) { | |
4143 | mddev->sync_speed_max = 0; | |
4144 | return len; | |
4145 | } | |
4146 | max = simple_strtoul(buf, &e, 10); | |
4147 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4148 | return -EINVAL; | |
4149 | mddev->sync_speed_max = max; | |
4150 | return len; | |
4151 | } | |
4152 | ||
4153 | static struct md_sysfs_entry md_sync_max = | |
4154 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4155 | ||
d7f3d291 | 4156 | static ssize_t |
fd01b88c | 4157 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4158 | { |
4159 | return sprintf(page, "%d\n", mddev->degraded); | |
4160 | } | |
4161 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4162 | |
90b08710 | 4163 | static ssize_t |
fd01b88c | 4164 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4165 | { |
4166 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4167 | } | |
4168 | ||
4169 | static ssize_t | |
fd01b88c | 4170 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4171 | { |
4172 | long n; | |
4173 | ||
b29bebd6 | 4174 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4175 | return -EINVAL; |
4176 | ||
4177 | if (n != 0 && n != 1) | |
4178 | return -EINVAL; | |
4179 | ||
4180 | mddev->parallel_resync = n; | |
4181 | ||
4182 | if (mddev->sync_thread) | |
4183 | wake_up(&resync_wait); | |
4184 | ||
4185 | return len; | |
4186 | } | |
4187 | ||
4188 | /* force parallel resync, even with shared block devices */ | |
4189 | static struct md_sysfs_entry md_sync_force_parallel = | |
4190 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4191 | sync_force_parallel_show, sync_force_parallel_store); | |
4192 | ||
88202a0c | 4193 | static ssize_t |
fd01b88c | 4194 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4195 | { |
4196 | unsigned long resync, dt, db; | |
d1a7c503 N |
4197 | if (mddev->curr_resync == 0) |
4198 | return sprintf(page, "none\n"); | |
9687a60c AN |
4199 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4200 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4201 | if (!dt) dt++; |
9687a60c AN |
4202 | db = resync - mddev->resync_mark_cnt; |
4203 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4204 | } |
4205 | ||
80ca3a44 | 4206 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4207 | |
4208 | static ssize_t | |
fd01b88c | 4209 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4210 | { |
13ae864b | 4211 | unsigned long long max_sectors, resync; |
88202a0c | 4212 | |
acb180b0 N |
4213 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4214 | return sprintf(page, "none\n"); | |
4215 | ||
72f36d59 N |
4216 | if (mddev->curr_resync == 1 || |
4217 | mddev->curr_resync == 2) | |
4218 | return sprintf(page, "delayed\n"); | |
4219 | ||
c804cdec N |
4220 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4221 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4222 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4223 | else |
58c0fed4 | 4224 | max_sectors = mddev->dev_sectors; |
88202a0c | 4225 | |
acb180b0 | 4226 | resync = mddev->curr_resync_completed; |
13ae864b | 4227 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4228 | } |
4229 | ||
80ca3a44 | 4230 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4231 | |
5e96ee65 | 4232 | static ssize_t |
fd01b88c | 4233 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4234 | { |
4235 | return sprintf(page, "%llu\n", | |
4236 | (unsigned long long)mddev->resync_min); | |
4237 | } | |
4238 | static ssize_t | |
fd01b88c | 4239 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4240 | { |
4241 | unsigned long long min; | |
b29bebd6 | 4242 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 NB |
4243 | return -EINVAL; |
4244 | if (min > mddev->resync_max) | |
4245 | return -EINVAL; | |
4246 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4247 | return -EBUSY; | |
4248 | ||
4249 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4250 | if (mddev->chunk_sectors) { |
2ac06c33 | 4251 | sector_t temp = min; |
9d8f0363 | 4252 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4253 | return -EINVAL; |
4254 | } | |
4255 | mddev->resync_min = min; | |
4256 | ||
4257 | return len; | |
4258 | } | |
4259 | ||
4260 | static struct md_sysfs_entry md_min_sync = | |
4261 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4262 | ||
c6207277 | 4263 | static ssize_t |
fd01b88c | 4264 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4265 | { |
4266 | if (mddev->resync_max == MaxSector) | |
4267 | return sprintf(page, "max\n"); | |
4268 | else | |
4269 | return sprintf(page, "%llu\n", | |
4270 | (unsigned long long)mddev->resync_max); | |
4271 | } | |
4272 | static ssize_t | |
fd01b88c | 4273 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 N |
4274 | { |
4275 | if (strncmp(buf, "max", 3) == 0) | |
4276 | mddev->resync_max = MaxSector; | |
4277 | else { | |
5e96ee65 | 4278 | unsigned long long max; |
b29bebd6 | 4279 | if (kstrtoull(buf, 10, &max)) |
5e96ee65 NB |
4280 | return -EINVAL; |
4281 | if (max < mddev->resync_min) | |
c6207277 N |
4282 | return -EINVAL; |
4283 | if (max < mddev->resync_max && | |
4d484a4a | 4284 | mddev->ro == 0 && |
c6207277 N |
4285 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4286 | return -EBUSY; | |
4287 | ||
4288 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4289 | if (mddev->chunk_sectors) { |
2ac06c33 | 4290 | sector_t temp = max; |
9d8f0363 | 4291 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4292 | return -EINVAL; |
4293 | } | |
4294 | mddev->resync_max = max; | |
4295 | } | |
4296 | wake_up(&mddev->recovery_wait); | |
4297 | return len; | |
4298 | } | |
4299 | ||
4300 | static struct md_sysfs_entry md_max_sync = | |
4301 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4302 | ||
e464eafd | 4303 | static ssize_t |
fd01b88c | 4304 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4305 | { |
4306 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4307 | } | |
4308 | ||
4309 | static ssize_t | |
fd01b88c | 4310 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4311 | { |
4312 | char *e; | |
4313 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4314 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4315 | |
f72ffdd6 | 4316 | if (mddev->pers == NULL || |
b8d966ef | 4317 | mddev->pers->quiesce == NULL) |
e464eafd N |
4318 | return -EINVAL; |
4319 | if (buf == e || (*e && *e != '\n')) | |
4320 | return -EINVAL; | |
23ddff37 N |
4321 | |
4322 | mddev->suspend_lo = new; | |
4323 | if (new >= old) | |
4324 | /* Shrinking suspended region */ | |
e464eafd | 4325 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4326 | else { |
4327 | /* Expanding suspended region - need to wait */ | |
4328 | mddev->pers->quiesce(mddev, 1); | |
4329 | mddev->pers->quiesce(mddev, 0); | |
4330 | } | |
4331 | return len; | |
e464eafd N |
4332 | } |
4333 | static struct md_sysfs_entry md_suspend_lo = | |
4334 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4335 | ||
e464eafd | 4336 | static ssize_t |
fd01b88c | 4337 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4338 | { |
4339 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4340 | } | |
4341 | ||
4342 | static ssize_t | |
fd01b88c | 4343 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4344 | { |
4345 | char *e; | |
4346 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4347 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4348 | |
b8d966ef N |
4349 | if (mddev->pers == NULL || |
4350 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4351 | return -EINVAL; |
4352 | if (buf == e || (*e && *e != '\n')) | |
4353 | return -EINVAL; | |
23ddff37 N |
4354 | |
4355 | mddev->suspend_hi = new; | |
4356 | if (new <= old) | |
4357 | /* Shrinking suspended region */ | |
4358 | mddev->pers->quiesce(mddev, 2); | |
4359 | else { | |
4360 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4361 | mddev->pers->quiesce(mddev, 1); |
4362 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4363 | } |
4364 | return len; | |
e464eafd N |
4365 | } |
4366 | static struct md_sysfs_entry md_suspend_hi = | |
4367 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4368 | ||
08a02ecd | 4369 | static ssize_t |
fd01b88c | 4370 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4371 | { |
4372 | if (mddev->reshape_position != MaxSector) | |
4373 | return sprintf(page, "%llu\n", | |
4374 | (unsigned long long)mddev->reshape_position); | |
4375 | strcpy(page, "none\n"); | |
4376 | return 5; | |
4377 | } | |
4378 | ||
4379 | static ssize_t | |
fd01b88c | 4380 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4381 | { |
c6563a8c | 4382 | struct md_rdev *rdev; |
08a02ecd N |
4383 | char *e; |
4384 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4385 | if (mddev->pers) | |
4386 | return -EBUSY; | |
4387 | if (buf == e || (*e && *e != '\n')) | |
4388 | return -EINVAL; | |
4389 | mddev->reshape_position = new; | |
4390 | mddev->delta_disks = 0; | |
2c810cdd | 4391 | mddev->reshape_backwards = 0; |
08a02ecd N |
4392 | mddev->new_level = mddev->level; |
4393 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4394 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4395 | rdev_for_each(rdev, mddev) |
4396 | rdev->new_data_offset = rdev->data_offset; | |
08a02ecd N |
4397 | return len; |
4398 | } | |
4399 | ||
4400 | static struct md_sysfs_entry md_reshape_position = | |
4401 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4402 | reshape_position_store); | |
4403 | ||
2c810cdd N |
4404 | static ssize_t |
4405 | reshape_direction_show(struct mddev *mddev, char *page) | |
4406 | { | |
4407 | return sprintf(page, "%s\n", | |
4408 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4409 | } | |
4410 | ||
4411 | static ssize_t | |
4412 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4413 | { | |
4414 | int backwards = 0; | |
4415 | if (cmd_match(buf, "forwards")) | |
4416 | backwards = 0; | |
4417 | else if (cmd_match(buf, "backwards")) | |
4418 | backwards = 1; | |
4419 | else | |
4420 | return -EINVAL; | |
4421 | if (mddev->reshape_backwards == backwards) | |
4422 | return len; | |
4423 | ||
4424 | /* check if we are allowed to change */ | |
4425 | if (mddev->delta_disks) | |
4426 | return -EBUSY; | |
4427 | ||
4428 | if (mddev->persistent && | |
4429 | mddev->major_version == 0) | |
4430 | return -EINVAL; | |
4431 | ||
4432 | mddev->reshape_backwards = backwards; | |
4433 | return len; | |
4434 | } | |
4435 | ||
4436 | static struct md_sysfs_entry md_reshape_direction = | |
4437 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4438 | reshape_direction_store); | |
4439 | ||
b522adcd | 4440 | static ssize_t |
fd01b88c | 4441 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4442 | { |
4443 | if (mddev->external_size) | |
4444 | return sprintf(page, "%llu\n", | |
4445 | (unsigned long long)mddev->array_sectors/2); | |
4446 | else | |
4447 | return sprintf(page, "default\n"); | |
4448 | } | |
4449 | ||
4450 | static ssize_t | |
fd01b88c | 4451 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4452 | { |
4453 | sector_t sectors; | |
4454 | ||
4455 | if (strncmp(buf, "default", 7) == 0) { | |
4456 | if (mddev->pers) | |
4457 | sectors = mddev->pers->size(mddev, 0, 0); | |
4458 | else | |
4459 | sectors = mddev->array_sectors; | |
4460 | ||
4461 | mddev->external_size = 0; | |
4462 | } else { | |
4463 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4464 | return -EINVAL; | |
4465 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4466 | return -E2BIG; |
b522adcd DW |
4467 | |
4468 | mddev->external_size = 1; | |
4469 | } | |
4470 | ||
4471 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4472 | if (mddev->pers) { |
4473 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4474 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4475 | } |
b522adcd DW |
4476 | return len; |
4477 | } | |
4478 | ||
4479 | static struct md_sysfs_entry md_array_size = | |
4480 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4481 | array_size_store); | |
e464eafd | 4482 | |
eae1701f N |
4483 | static struct attribute *md_default_attrs[] = { |
4484 | &md_level.attr, | |
d4dbd025 | 4485 | &md_layout.attr, |
eae1701f | 4486 | &md_raid_disks.attr, |
3b34380a | 4487 | &md_chunk_size.attr, |
a35b0d69 | 4488 | &md_size.attr, |
a94213b1 | 4489 | &md_resync_start.attr, |
8bb93aac | 4490 | &md_metadata.attr, |
6d7ff738 | 4491 | &md_new_device.attr, |
16f17b39 | 4492 | &md_safe_delay.attr, |
9e653b63 | 4493 | &md_array_state.attr, |
08a02ecd | 4494 | &md_reshape_position.attr, |
2c810cdd | 4495 | &md_reshape_direction.attr, |
b522adcd | 4496 | &md_array_size.attr, |
1e50915f | 4497 | &max_corr_read_errors.attr, |
411036fa N |
4498 | NULL, |
4499 | }; | |
4500 | ||
4501 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4502 | &md_scan_mode.attr, |
c4a39551 | 4503 | &md_last_scan_mode.attr, |
9d88883e | 4504 | &md_mismatches.attr, |
88202a0c N |
4505 | &md_sync_min.attr, |
4506 | &md_sync_max.attr, | |
4507 | &md_sync_speed.attr, | |
90b08710 | 4508 | &md_sync_force_parallel.attr, |
88202a0c | 4509 | &md_sync_completed.attr, |
5e96ee65 | 4510 | &md_min_sync.attr, |
c6207277 | 4511 | &md_max_sync.attr, |
e464eafd N |
4512 | &md_suspend_lo.attr, |
4513 | &md_suspend_hi.attr, | |
9b1d1dac | 4514 | &md_bitmap.attr, |
d7f3d291 | 4515 | &md_degraded.attr, |
eae1701f N |
4516 | NULL, |
4517 | }; | |
411036fa N |
4518 | static struct attribute_group md_redundancy_group = { |
4519 | .name = NULL, | |
4520 | .attrs = md_redundancy_attrs, | |
4521 | }; | |
4522 | ||
eae1701f N |
4523 | static ssize_t |
4524 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4525 | { | |
4526 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4527 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4528 | ssize_t rv; |
eae1701f N |
4529 | |
4530 | if (!entry->show) | |
4531 | return -EIO; | |
af8a2434 N |
4532 | spin_lock(&all_mddevs_lock); |
4533 | if (list_empty(&mddev->all_mddevs)) { | |
4534 | spin_unlock(&all_mddevs_lock); | |
4535 | return -EBUSY; | |
4536 | } | |
4537 | mddev_get(mddev); | |
4538 | spin_unlock(&all_mddevs_lock); | |
4539 | ||
5dc5cf7d IM |
4540 | rv = mddev_lock(mddev); |
4541 | if (!rv) { | |
4542 | rv = entry->show(mddev, page); | |
4543 | mddev_unlock(mddev); | |
4544 | } | |
af8a2434 | 4545 | mddev_put(mddev); |
96de1e66 | 4546 | return rv; |
eae1701f N |
4547 | } |
4548 | ||
4549 | static ssize_t | |
4550 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4551 | const char *page, size_t length) | |
4552 | { | |
4553 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4554 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4555 | ssize_t rv; |
eae1701f N |
4556 | |
4557 | if (!entry->store) | |
4558 | return -EIO; | |
67463acb N |
4559 | if (!capable(CAP_SYS_ADMIN)) |
4560 | return -EACCES; | |
af8a2434 N |
4561 | spin_lock(&all_mddevs_lock); |
4562 | if (list_empty(&mddev->all_mddevs)) { | |
4563 | spin_unlock(&all_mddevs_lock); | |
4564 | return -EBUSY; | |
4565 | } | |
4566 | mddev_get(mddev); | |
4567 | spin_unlock(&all_mddevs_lock); | |
a7a3f08d N |
4568 | if (entry->store == new_dev_store) |
4569 | flush_workqueue(md_misc_wq); | |
5dc5cf7d IM |
4570 | rv = mddev_lock(mddev); |
4571 | if (!rv) { | |
4572 | rv = entry->store(mddev, page, length); | |
4573 | mddev_unlock(mddev); | |
4574 | } | |
af8a2434 | 4575 | mddev_put(mddev); |
96de1e66 | 4576 | return rv; |
eae1701f N |
4577 | } |
4578 | ||
4579 | static void md_free(struct kobject *ko) | |
4580 | { | |
fd01b88c | 4581 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4582 | |
4583 | if (mddev->sysfs_state) | |
4584 | sysfs_put(mddev->sysfs_state); | |
4585 | ||
4586 | if (mddev->gendisk) { | |
4587 | del_gendisk(mddev->gendisk); | |
4588 | put_disk(mddev->gendisk); | |
4589 | } | |
4590 | if (mddev->queue) | |
4591 | blk_cleanup_queue(mddev->queue); | |
4592 | ||
eae1701f N |
4593 | kfree(mddev); |
4594 | } | |
4595 | ||
52cf25d0 | 4596 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4597 | .show = md_attr_show, |
4598 | .store = md_attr_store, | |
4599 | }; | |
4600 | static struct kobj_type md_ktype = { | |
4601 | .release = md_free, | |
4602 | .sysfs_ops = &md_sysfs_ops, | |
4603 | .default_attrs = md_default_attrs, | |
4604 | }; | |
4605 | ||
1da177e4 LT |
4606 | int mdp_major = 0; |
4607 | ||
5fd3a17e DW |
4608 | static void mddev_delayed_delete(struct work_struct *ws) |
4609 | { | |
fd01b88c | 4610 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4611 | |
43a70507 | 4612 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4613 | kobject_del(&mddev->kobj); |
4614 | kobject_put(&mddev->kobj); | |
4615 | } | |
4616 | ||
efeb53c0 | 4617 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4618 | { |
48c9c27b | 4619 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4620 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4621 | struct gendisk *disk; |
efeb53c0 N |
4622 | int partitioned; |
4623 | int shift; | |
4624 | int unit; | |
3830c62f | 4625 | int error; |
1da177e4 LT |
4626 | |
4627 | if (!mddev) | |
efeb53c0 N |
4628 | return -ENODEV; |
4629 | ||
4630 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4631 | shift = partitioned ? MdpMinorShift : 0; | |
4632 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4633 | |
e804ac78 TH |
4634 | /* wait for any previous instance of this device to be |
4635 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4636 | */ |
e804ac78 | 4637 | flush_workqueue(md_misc_wq); |
d3374825 | 4638 | |
48c9c27b | 4639 | mutex_lock(&disks_mutex); |
0909dc44 N |
4640 | error = -EEXIST; |
4641 | if (mddev->gendisk) | |
4642 | goto abort; | |
efeb53c0 N |
4643 | |
4644 | if (name) { | |
4645 | /* Need to ensure that 'name' is not a duplicate. | |
4646 | */ | |
fd01b88c | 4647 | struct mddev *mddev2; |
efeb53c0 N |
4648 | spin_lock(&all_mddevs_lock); |
4649 | ||
4650 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4651 | if (mddev2->gendisk && | |
4652 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4653 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4654 | goto abort; |
efeb53c0 N |
4655 | } |
4656 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4657 | } |
8b765398 | 4658 | |
0909dc44 | 4659 | error = -ENOMEM; |
8b765398 | 4660 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4661 | if (!mddev->queue) |
4662 | goto abort; | |
409c57f3 N |
4663 | mddev->queue->queuedata = mddev; |
4664 | ||
409c57f3 | 4665 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 4666 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 4667 | |
1da177e4 LT |
4668 | disk = alloc_disk(1 << shift); |
4669 | if (!disk) { | |
8b765398 N |
4670 | blk_cleanup_queue(mddev->queue); |
4671 | mddev->queue = NULL; | |
0909dc44 | 4672 | goto abort; |
1da177e4 | 4673 | } |
efeb53c0 | 4674 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4675 | disk->first_minor = unit << shift; |
efeb53c0 N |
4676 | if (name) |
4677 | strcpy(disk->disk_name, name); | |
4678 | else if (partitioned) | |
1da177e4 | 4679 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4680 | else |
1da177e4 | 4681 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4682 | disk->fops = &md_fops; |
4683 | disk->private_data = mddev; | |
4684 | disk->queue = mddev->queue; | |
b0140891 | 4685 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4686 | /* Allow extended partitions. This makes the |
d3374825 | 4687 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4688 | * remove it now. |
4689 | */ | |
4690 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4691 | mddev->gendisk = disk; |
b0140891 N |
4692 | /* As soon as we call add_disk(), another thread could get |
4693 | * through to md_open, so make sure it doesn't get too far | |
4694 | */ | |
4695 | mutex_lock(&mddev->open_mutex); | |
4696 | add_disk(disk); | |
4697 | ||
ed9e1982 TH |
4698 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4699 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4700 | if (error) { |
4701 | /* This isn't possible, but as kobject_init_and_add is marked | |
4702 | * __must_check, we must do something with the result | |
4703 | */ | |
5e55e2f5 N |
4704 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4705 | disk->disk_name); | |
0909dc44 N |
4706 | error = 0; |
4707 | } | |
00bcb4ac N |
4708 | if (mddev->kobj.sd && |
4709 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4710 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4711 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4712 | abort: |
4713 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4714 | if (!error && mddev->kobj.sd) { |
3830c62f | 4715 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4716 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4717 | } |
d3374825 | 4718 | mddev_put(mddev); |
0909dc44 | 4719 | return error; |
efeb53c0 N |
4720 | } |
4721 | ||
4722 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4723 | { | |
4724 | md_alloc(dev, NULL); | |
1da177e4 LT |
4725 | return NULL; |
4726 | } | |
4727 | ||
efeb53c0 N |
4728 | static int add_named_array(const char *val, struct kernel_param *kp) |
4729 | { | |
4730 | /* val must be "md_*" where * is not all digits. | |
4731 | * We allocate an array with a large free minor number, and | |
4732 | * set the name to val. val must not already be an active name. | |
4733 | */ | |
4734 | int len = strlen(val); | |
4735 | char buf[DISK_NAME_LEN]; | |
4736 | ||
4737 | while (len && val[len-1] == '\n') | |
4738 | len--; | |
4739 | if (len >= DISK_NAME_LEN) | |
4740 | return -E2BIG; | |
4741 | strlcpy(buf, val, len+1); | |
4742 | if (strncmp(buf, "md_", 3) != 0) | |
4743 | return -EINVAL; | |
4744 | return md_alloc(0, buf); | |
4745 | } | |
4746 | ||
1da177e4 LT |
4747 | static void md_safemode_timeout(unsigned long data) |
4748 | { | |
fd01b88c | 4749 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 4750 | |
0fd62b86 NB |
4751 | if (!atomic_read(&mddev->writes_pending)) { |
4752 | mddev->safemode = 1; | |
4753 | if (mddev->external) | |
00bcb4ac | 4754 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4755 | } |
1da177e4 LT |
4756 | md_wakeup_thread(mddev->thread); |
4757 | } | |
4758 | ||
6ff8d8ec | 4759 | static int start_dirty_degraded; |
1da177e4 | 4760 | |
fd01b88c | 4761 | int md_run(struct mddev *mddev) |
1da177e4 | 4762 | { |
2604b703 | 4763 | int err; |
3cb03002 | 4764 | struct md_rdev *rdev; |
84fc4b56 | 4765 | struct md_personality *pers; |
1da177e4 | 4766 | |
a757e64c N |
4767 | if (list_empty(&mddev->disks)) |
4768 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4769 | return -EINVAL; |
1da177e4 LT |
4770 | |
4771 | if (mddev->pers) | |
4772 | return -EBUSY; | |
bb4f1e9d N |
4773 | /* Cannot run until previous stop completes properly */ |
4774 | if (mddev->sysfs_active) | |
4775 | return -EBUSY; | |
b6eb127d | 4776 | |
1da177e4 LT |
4777 | /* |
4778 | * Analyze all RAID superblock(s) | |
4779 | */ | |
1ec4a939 N |
4780 | if (!mddev->raid_disks) { |
4781 | if (!mddev->persistent) | |
4782 | return -EINVAL; | |
a757e64c | 4783 | analyze_sbs(mddev); |
1ec4a939 | 4784 | } |
1da177e4 | 4785 | |
d9d166c2 N |
4786 | if (mddev->level != LEVEL_NONE) |
4787 | request_module("md-level-%d", mddev->level); | |
4788 | else if (mddev->clevel[0]) | |
4789 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4790 | |
4791 | /* | |
4792 | * Drop all container device buffers, from now on | |
4793 | * the only valid external interface is through the md | |
4794 | * device. | |
1da177e4 | 4795 | */ |
dafb20fa | 4796 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 4797 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4798 | continue; |
4799 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4800 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4801 | |
4802 | /* perform some consistency tests on the device. | |
4803 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4804 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4805 | */ |
a6ff7e08 JB |
4806 | if (rdev->meta_bdev) { |
4807 | /* Nothing to check */; | |
4808 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4809 | if (mddev->dev_sectors && |
4810 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4811 | > rdev->sb_start) { |
f0d76d70 N |
4812 | printk("md: %s: data overlaps metadata\n", |
4813 | mdname(mddev)); | |
4814 | return -EINVAL; | |
4815 | } | |
4816 | } else { | |
0f420358 | 4817 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4818 | > rdev->data_offset) { |
4819 | printk("md: %s: metadata overlaps data\n", | |
4820 | mdname(mddev)); | |
4821 | return -EINVAL; | |
4822 | } | |
4823 | } | |
00bcb4ac | 4824 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4825 | } |
4826 | ||
a167f663 | 4827 | if (mddev->bio_set == NULL) |
395c72a7 | 4828 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 4829 | |
1da177e4 | 4830 | spin_lock(&pers_lock); |
d9d166c2 | 4831 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4832 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4833 | spin_unlock(&pers_lock); |
d9d166c2 N |
4834 | if (mddev->level != LEVEL_NONE) |
4835 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4836 | mddev->level); | |
4837 | else | |
4838 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4839 | mddev->clevel); | |
1da177e4 LT |
4840 | return -EINVAL; |
4841 | } | |
2604b703 | 4842 | mddev->pers = pers; |
1da177e4 | 4843 | spin_unlock(&pers_lock); |
34817e8c N |
4844 | if (mddev->level != pers->level) { |
4845 | mddev->level = pers->level; | |
4846 | mddev->new_level = pers->level; | |
4847 | } | |
d9d166c2 | 4848 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4849 | |
f6705578 | 4850 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4851 | pers->start_reshape == NULL) { |
f6705578 N |
4852 | /* This personality cannot handle reshaping... */ |
4853 | mddev->pers = NULL; | |
4854 | module_put(pers->owner); | |
4855 | return -EINVAL; | |
4856 | } | |
4857 | ||
7dd5e7c3 N |
4858 | if (pers->sync_request) { |
4859 | /* Warn if this is a potentially silly | |
4860 | * configuration. | |
4861 | */ | |
4862 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 4863 | struct md_rdev *rdev2; |
7dd5e7c3 | 4864 | int warned = 0; |
159ec1fc | 4865 | |
dafb20fa N |
4866 | rdev_for_each(rdev, mddev) |
4867 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
4868 | if (rdev < rdev2 && |
4869 | rdev->bdev->bd_contains == | |
4870 | rdev2->bdev->bd_contains) { | |
4871 | printk(KERN_WARNING | |
4872 | "%s: WARNING: %s appears to be" | |
4873 | " on the same physical disk as" | |
4874 | " %s.\n", | |
4875 | mdname(mddev), | |
4876 | bdevname(rdev->bdev,b), | |
4877 | bdevname(rdev2->bdev,b2)); | |
4878 | warned = 1; | |
4879 | } | |
4880 | } | |
159ec1fc | 4881 | |
7dd5e7c3 N |
4882 | if (warned) |
4883 | printk(KERN_WARNING | |
4884 | "True protection against single-disk" | |
4885 | " failure might be compromised.\n"); | |
4886 | } | |
4887 | ||
657390d2 | 4888 | mddev->recovery = 0; |
58c0fed4 AN |
4889 | /* may be over-ridden by personality */ |
4890 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4891 | ||
6ff8d8ec | 4892 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4893 | |
0f9552b5 | 4894 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4895 | mddev->ro = 2; /* read-only, but switch on first write */ |
4896 | ||
b15c2e57 | 4897 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4898 | if (err) |
4899 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4900 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4901 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4902 | " but 'external_size' not in effect?\n", __func__); | |
4903 | printk(KERN_ERR | |
4904 | "md: invalid array_size %llu > default size %llu\n", | |
4905 | (unsigned long long)mddev->array_sectors / 2, | |
4906 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4907 | err = -EINVAL; | |
4908 | mddev->pers->stop(mddev); | |
4909 | } | |
ef99bf48 N |
4910 | if (err == 0 && mddev->pers->sync_request && |
4911 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { | |
b15c2e57 N |
4912 | err = bitmap_create(mddev); |
4913 | if (err) { | |
4914 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4915 | mdname(mddev), err); | |
4916 | mddev->pers->stop(mddev); | |
4917 | } | |
4918 | } | |
1da177e4 | 4919 | if (err) { |
1da177e4 LT |
4920 | module_put(mddev->pers->owner); |
4921 | mddev->pers = NULL; | |
32a7627c N |
4922 | bitmap_destroy(mddev); |
4923 | return err; | |
1da177e4 | 4924 | } |
5c675f83 N |
4925 | if (mddev->queue) { |
4926 | mddev->queue->backing_dev_info.congested_data = mddev; | |
4927 | mddev->queue->backing_dev_info.congested_fn = md_congested; | |
4928 | } | |
5e55e2f5 | 4929 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4930 | if (mddev->kobj.sd && |
4931 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4932 | printk(KERN_WARNING |
4933 | "md: cannot register extra attributes for %s\n", | |
4934 | mdname(mddev)); | |
00bcb4ac | 4935 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4936 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4937 | mddev->ro = 0; |
4938 | ||
f72ffdd6 | 4939 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4940 | atomic_set(&mddev->max_corr_read_errors, |
4941 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4942 | mddev->safemode = 0; |
4943 | mddev->safemode_timer.function = md_safemode_timeout; | |
4944 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4945 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4946 | mddev->in_sync = 1; |
0ca69886 N |
4947 | smp_wmb(); |
4948 | mddev->ready = 1; | |
dafb20fa | 4949 | rdev_for_each(rdev, mddev) |
36fad858 NK |
4950 | if (rdev->raid_disk >= 0) |
4951 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 4952 | /* failure here is OK */; |
f72ffdd6 | 4953 | |
1da177e4 | 4954 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 4955 | |
7a0a5355 | 4956 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 4957 | md_update_sb(mddev, 0); |
1da177e4 | 4958 | |
d7603b7e | 4959 | md_new_event(mddev); |
00bcb4ac N |
4960 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4961 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4962 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4963 | return 0; |
4964 | } | |
390ee602 | 4965 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4966 | |
fd01b88c | 4967 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
4968 | { |
4969 | int err; | |
4970 | ||
4971 | err = md_run(mddev); | |
4972 | if (err) | |
4973 | goto out; | |
69e51b44 N |
4974 | err = bitmap_load(mddev); |
4975 | if (err) { | |
4976 | bitmap_destroy(mddev); | |
4977 | goto out; | |
4978 | } | |
0fd018af JB |
4979 | |
4980 | md_wakeup_thread(mddev->thread); | |
4981 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
4982 | ||
fe60b014 N |
4983 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4984 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 4985 | mddev->changed = 1; |
fe60b014 N |
4986 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
4987 | out: | |
4988 | return err; | |
4989 | } | |
4990 | ||
fd01b88c | 4991 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
4992 | { |
4993 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4994 | |
80fab1d7 | 4995 | /* Complain if it has no devices */ |
1da177e4 | 4996 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4997 | return -ENXIO; |
4998 | if (!mddev->pers) | |
4999 | return -EINVAL; | |
5000 | if (!mddev->ro) | |
5001 | return -EBUSY; | |
5002 | mddev->safemode = 0; | |
5003 | mddev->ro = 0; | |
5004 | set_disk_ro(disk, 0); | |
5005 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5006 | mdname(mddev)); | |
5007 | /* Kick recovery or resync if necessary */ | |
5008 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5009 | md_wakeup_thread(mddev->thread); | |
5010 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5011 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5012 | return 0; |
1da177e4 LT |
5013 | } |
5014 | ||
fd01b88c | 5015 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5016 | { |
5017 | mddev->array_sectors = 0; | |
5018 | mddev->external_size = 0; | |
5019 | mddev->dev_sectors = 0; | |
5020 | mddev->raid_disks = 0; | |
5021 | mddev->recovery_cp = 0; | |
5022 | mddev->resync_min = 0; | |
5023 | mddev->resync_max = MaxSector; | |
5024 | mddev->reshape_position = MaxSector; | |
5025 | mddev->external = 0; | |
5026 | mddev->persistent = 0; | |
5027 | mddev->level = LEVEL_NONE; | |
5028 | mddev->clevel[0] = 0; | |
5029 | mddev->flags = 0; | |
5030 | mddev->ro = 0; | |
5031 | mddev->metadata_type[0] = 0; | |
5032 | mddev->chunk_sectors = 0; | |
5033 | mddev->ctime = mddev->utime = 0; | |
5034 | mddev->layout = 0; | |
5035 | mddev->max_disks = 0; | |
5036 | mddev->events = 0; | |
a8707c08 | 5037 | mddev->can_decrease_events = 0; |
6177b472 | 5038 | mddev->delta_disks = 0; |
2c810cdd | 5039 | mddev->reshape_backwards = 0; |
6177b472 N |
5040 | mddev->new_level = LEVEL_NONE; |
5041 | mddev->new_layout = 0; | |
5042 | mddev->new_chunk_sectors = 0; | |
5043 | mddev->curr_resync = 0; | |
7f7583d4 | 5044 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5045 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5046 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5047 | mddev->recovery = 0; | |
5048 | mddev->in_sync = 0; | |
f0b4f7e2 | 5049 | mddev->changed = 0; |
6177b472 | 5050 | mddev->degraded = 0; |
6177b472 | 5051 | mddev->safemode = 0; |
050b6615 | 5052 | mddev->merge_check_needed = 0; |
6177b472 N |
5053 | mddev->bitmap_info.offset = 0; |
5054 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5055 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5056 | mddev->bitmap_info.chunksize = 0; |
5057 | mddev->bitmap_info.daemon_sleep = 0; | |
5058 | mddev->bitmap_info.max_write_behind = 0; | |
5059 | } | |
5060 | ||
fd01b88c | 5061 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5062 | { |
6b6204ee | 5063 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5064 | flush_workqueue(md_misc_wq); |
a047e125 | 5065 | if (mddev->sync_thread) { |
a047e125 | 5066 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5067 | md_reap_sync_thread(mddev); |
a047e125 N |
5068 | } |
5069 | ||
5070 | del_timer_sync(&mddev->safemode_timer); | |
5071 | ||
5072 | bitmap_flush(mddev); | |
5073 | md_super_wait(mddev); | |
5074 | ||
b6d428c6 | 5075 | if (mddev->ro == 0 && |
7a0a5355 | 5076 | (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) { |
a047e125 N |
5077 | /* mark array as shutdown cleanly */ |
5078 | mddev->in_sync = 1; | |
5079 | md_update_sb(mddev, 1); | |
5080 | } | |
5081 | } | |
defad61a | 5082 | |
fd01b88c | 5083 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5084 | { |
29f097c4 | 5085 | mddev_lock_nointr(mddev); |
defad61a N |
5086 | __md_stop_writes(mddev); |
5087 | mddev_unlock(mddev); | |
5088 | } | |
390ee602 | 5089 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5090 | |
5eff3c43 | 5091 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5092 | { |
0ca69886 | 5093 | mddev->ready = 0; |
6177b472 N |
5094 | mddev->pers->stop(mddev); |
5095 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
5096 | mddev->to_remove = &md_redundancy_group; | |
5097 | module_put(mddev->pers->owner); | |
5098 | mddev->pers = NULL; | |
cca9cf90 | 5099 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5100 | } |
5eff3c43 N |
5101 | |
5102 | void md_stop(struct mddev *mddev) | |
5103 | { | |
5104 | /* stop the array and free an attached data structures. | |
5105 | * This is called from dm-raid | |
5106 | */ | |
5107 | __md_stop(mddev); | |
5108 | bitmap_destroy(mddev); | |
5109 | if (mddev->bio_set) | |
5110 | bioset_free(mddev->bio_set); | |
5111 | } | |
5112 | ||
390ee602 | 5113 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5114 | |
a05b7ea0 | 5115 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5116 | { |
5117 | int err = 0; | |
30b8feb7 N |
5118 | int did_freeze = 0; |
5119 | ||
5120 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5121 | did_freeze = 1; | |
5122 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5123 | md_wakeup_thread(mddev->thread); | |
5124 | } | |
f851b60d | 5125 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5126 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5127 | if (mddev->sync_thread) |
30b8feb7 N |
5128 | /* Thread might be blocked waiting for metadata update |
5129 | * which will now never happen */ | |
5130 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5131 | |
30b8feb7 | 5132 | mddev_unlock(mddev); |
f851b60d N |
5133 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5134 | &mddev->recovery)); | |
30b8feb7 N |
5135 | mddev_lock_nointr(mddev); |
5136 | ||
a4bd82d0 | 5137 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5138 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5139 | mddev->sync_thread || |
f851b60d | 5140 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5141 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
a4bd82d0 | 5142 | printk("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5143 | if (did_freeze) { |
5144 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5145 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5146 | md_wakeup_thread(mddev->thread); |
5147 | } | |
a4bd82d0 N |
5148 | err = -EBUSY; |
5149 | goto out; | |
5150 | } | |
5151 | if (mddev->pers) { | |
defad61a | 5152 | __md_stop_writes(mddev); |
a4bd82d0 N |
5153 | |
5154 | err = -ENXIO; | |
5155 | if (mddev->ro==1) | |
5156 | goto out; | |
5157 | mddev->ro = 1; | |
5158 | set_disk_ro(mddev->gendisk, 1); | |
5159 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5160 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5161 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5162 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5163 | err = 0; |
a4bd82d0 N |
5164 | } |
5165 | out: | |
5166 | mutex_unlock(&mddev->open_mutex); | |
5167 | return err; | |
5168 | } | |
5169 | ||
9e653b63 N |
5170 | /* mode: |
5171 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5172 | * 2 - stop but do not disassemble array |
5173 | */ | |
f72ffdd6 | 5174 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5175 | struct block_device *bdev) |
1da177e4 | 5176 | { |
1da177e4 | 5177 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5178 | struct md_rdev *rdev; |
30b8feb7 N |
5179 | int did_freeze = 0; |
5180 | ||
5181 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5182 | did_freeze = 1; | |
5183 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5184 | md_wakeup_thread(mddev->thread); | |
5185 | } | |
f851b60d | 5186 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5187 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5188 | if (mddev->sync_thread) |
30b8feb7 N |
5189 | /* Thread might be blocked waiting for metadata update |
5190 | * which will now never happen */ | |
5191 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5192 | |
30b8feb7 | 5193 | mddev_unlock(mddev); |
f851b60d N |
5194 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5195 | !test_bit(MD_RECOVERY_RUNNING, | |
5196 | &mddev->recovery))); | |
30b8feb7 | 5197 | mddev_lock_nointr(mddev); |
1da177e4 | 5198 | |
c8c00a69 | 5199 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5200 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5201 | mddev->sysfs_active || |
5202 | mddev->sync_thread || | |
f851b60d | 5203 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5204 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
df5b20cf | 5205 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5206 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5207 | if (did_freeze) { |
5208 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5209 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5210 | md_wakeup_thread(mddev->thread); |
5211 | } | |
260fa034 N |
5212 | return -EBUSY; |
5213 | } | |
6e17b027 | 5214 | if (mddev->pers) { |
a4bd82d0 N |
5215 | if (mddev->ro) |
5216 | set_disk_ro(disk, 0); | |
409c57f3 | 5217 | |
defad61a | 5218 | __md_stop_writes(mddev); |
5eff3c43 | 5219 | __md_stop(mddev); |
a4bd82d0 | 5220 | mddev->queue->merge_bvec_fn = NULL; |
a4bd82d0 | 5221 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5222 | |
a4bd82d0 | 5223 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5224 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5225 | |
dafb20fa | 5226 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5227 | if (rdev->raid_disk >= 0) |
5228 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5229 | |
a4bd82d0 | 5230 | set_capacity(disk, 0); |
6e17b027 | 5231 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5232 | mddev->changed = 1; |
a4bd82d0 | 5233 | revalidate_disk(disk); |
0d4ca600 | 5234 | |
a4bd82d0 N |
5235 | if (mddev->ro) |
5236 | mddev->ro = 0; | |
6e17b027 N |
5237 | } else |
5238 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5239 | /* |
5240 | * Free resources if final stop | |
5241 | */ | |
9e653b63 | 5242 | if (mode == 0) { |
1da177e4 LT |
5243 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5244 | ||
978f946b | 5245 | bitmap_destroy(mddev); |
c3d9714e | 5246 | if (mddev->bitmap_info.file) { |
c3d9714e N |
5247 | fput(mddev->bitmap_info.file); |
5248 | mddev->bitmap_info.file = NULL; | |
978f946b | 5249 | } |
c3d9714e | 5250 | mddev->bitmap_info.offset = 0; |
978f946b | 5251 | |
1da177e4 LT |
5252 | export_array(mddev); |
5253 | ||
6177b472 | 5254 | md_clean(mddev); |
934d9c23 | 5255 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5256 | if (mddev->hold_active == UNTIL_STOP) |
5257 | mddev->hold_active = 0; | |
a4bd82d0 | 5258 | } |
3f9d99c1 | 5259 | blk_integrity_unregister(disk); |
d7603b7e | 5260 | md_new_event(mddev); |
00bcb4ac | 5261 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5262 | return 0; |
1da177e4 LT |
5263 | } |
5264 | ||
fdee8ae4 | 5265 | #ifndef MODULE |
fd01b88c | 5266 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5267 | { |
3cb03002 | 5268 | struct md_rdev *rdev; |
1da177e4 LT |
5269 | int err; |
5270 | ||
a757e64c | 5271 | if (list_empty(&mddev->disks)) |
1da177e4 | 5272 | return; |
1da177e4 LT |
5273 | |
5274 | printk(KERN_INFO "md: running: "); | |
5275 | ||
dafb20fa | 5276 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5277 | char b[BDEVNAME_SIZE]; |
5278 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5279 | } | |
5280 | printk("\n"); | |
5281 | ||
d710e138 | 5282 | err = do_md_run(mddev); |
1da177e4 LT |
5283 | if (err) { |
5284 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5285 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5286 | } |
5287 | } | |
5288 | ||
5289 | /* | |
5290 | * lets try to run arrays based on all disks that have arrived | |
5291 | * until now. (those are in pending_raid_disks) | |
5292 | * | |
5293 | * the method: pick the first pending disk, collect all disks with | |
5294 | * the same UUID, remove all from the pending list and put them into | |
5295 | * the 'same_array' list. Then order this list based on superblock | |
5296 | * update time (freshest comes first), kick out 'old' disks and | |
5297 | * compare superblocks. If everything's fine then run it. | |
5298 | * | |
5299 | * If "unit" is allocated, then bump its reference count | |
5300 | */ | |
5301 | static void autorun_devices(int part) | |
5302 | { | |
3cb03002 | 5303 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5304 | struct mddev *mddev; |
1da177e4 LT |
5305 | char b[BDEVNAME_SIZE]; |
5306 | ||
5307 | printk(KERN_INFO "md: autorun ...\n"); | |
5308 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5309 | int unit; |
1da177e4 | 5310 | dev_t dev; |
ad01c9e3 | 5311 | LIST_HEAD(candidates); |
1da177e4 | 5312 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5313 | struct md_rdev, same_set); |
1da177e4 LT |
5314 | |
5315 | printk(KERN_INFO "md: considering %s ...\n", | |
5316 | bdevname(rdev0->bdev,b)); | |
5317 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5318 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5319 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5320 | printk(KERN_INFO "md: adding %s ...\n", | |
5321 | bdevname(rdev->bdev,b)); | |
5322 | list_move(&rdev->same_set, &candidates); | |
5323 | } | |
5324 | /* | |
5325 | * now we have a set of devices, with all of them having | |
5326 | * mostly sane superblocks. It's time to allocate the | |
5327 | * mddev. | |
5328 | */ | |
e8703fe1 N |
5329 | if (part) { |
5330 | dev = MKDEV(mdp_major, | |
5331 | rdev0->preferred_minor << MdpMinorShift); | |
5332 | unit = MINOR(dev) >> MdpMinorShift; | |
5333 | } else { | |
5334 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5335 | unit = MINOR(dev); | |
5336 | } | |
5337 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5338 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5339 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5340 | break; | |
5341 | } | |
1da177e4 LT |
5342 | |
5343 | md_probe(dev, NULL, NULL); | |
5344 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5345 | if (!mddev || !mddev->gendisk) { |
5346 | if (mddev) | |
5347 | mddev_put(mddev); | |
5348 | printk(KERN_ERR | |
1da177e4 LT |
5349 | "md: cannot allocate memory for md drive.\n"); |
5350 | break; | |
5351 | } | |
f72ffdd6 | 5352 | if (mddev_lock(mddev)) |
1da177e4 LT |
5353 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
5354 | mdname(mddev)); | |
5355 | else if (mddev->raid_disks || mddev->major_version | |
5356 | || !list_empty(&mddev->disks)) { | |
f72ffdd6 | 5357 | printk(KERN_WARNING |
1da177e4 LT |
5358 | "md: %s already running, cannot run %s\n", |
5359 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5360 | mddev_unlock(mddev); | |
5361 | } else { | |
5362 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5363 | mddev->persistent = 1; |
159ec1fc | 5364 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5365 | list_del_init(&rdev->same_set); |
5366 | if (bind_rdev_to_array(rdev, mddev)) | |
5367 | export_rdev(rdev); | |
5368 | } | |
5369 | autorun_array(mddev); | |
5370 | mddev_unlock(mddev); | |
5371 | } | |
5372 | /* on success, candidates will be empty, on error | |
5373 | * it won't... | |
5374 | */ | |
159ec1fc | 5375 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5376 | list_del_init(&rdev->same_set); |
1da177e4 | 5377 | export_rdev(rdev); |
4b80991c | 5378 | } |
1da177e4 LT |
5379 | mddev_put(mddev); |
5380 | } | |
5381 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5382 | } | |
fdee8ae4 | 5383 | #endif /* !MODULE */ |
1da177e4 | 5384 | |
f72ffdd6 | 5385 | static int get_version(void __user *arg) |
1da177e4 LT |
5386 | { |
5387 | mdu_version_t ver; | |
5388 | ||
5389 | ver.major = MD_MAJOR_VERSION; | |
5390 | ver.minor = MD_MINOR_VERSION; | |
5391 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5392 | ||
5393 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5394 | return -EFAULT; | |
5395 | ||
5396 | return 0; | |
5397 | } | |
5398 | ||
f72ffdd6 | 5399 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
5400 | { |
5401 | mdu_array_info_t info; | |
a9f326eb | 5402 | int nr,working,insync,failed,spare; |
3cb03002 | 5403 | struct md_rdev *rdev; |
1da177e4 | 5404 | |
1ca69c4b N |
5405 | nr = working = insync = failed = spare = 0; |
5406 | rcu_read_lock(); | |
5407 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5408 | nr++; |
b2d444d7 | 5409 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5410 | failed++; |
5411 | else { | |
5412 | working++; | |
b2d444d7 | 5413 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 5414 | insync++; |
1da177e4 LT |
5415 | else |
5416 | spare++; | |
5417 | } | |
5418 | } | |
1ca69c4b | 5419 | rcu_read_unlock(); |
1da177e4 LT |
5420 | |
5421 | info.major_version = mddev->major_version; | |
5422 | info.minor_version = mddev->minor_version; | |
5423 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5424 | info.ctime = mddev->ctime; | |
5425 | info.level = mddev->level; | |
58c0fed4 AN |
5426 | info.size = mddev->dev_sectors / 2; |
5427 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5428 | info.size = -1; |
1da177e4 LT |
5429 | info.nr_disks = nr; |
5430 | info.raid_disks = mddev->raid_disks; | |
5431 | info.md_minor = mddev->md_minor; | |
5432 | info.not_persistent= !mddev->persistent; | |
5433 | ||
5434 | info.utime = mddev->utime; | |
5435 | info.state = 0; | |
5436 | if (mddev->in_sync) | |
5437 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5438 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 5439 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5440 | info.active_disks = insync; |
1da177e4 LT |
5441 | info.working_disks = working; |
5442 | info.failed_disks = failed; | |
5443 | info.spare_disks = spare; | |
5444 | ||
5445 | info.layout = mddev->layout; | |
9d8f0363 | 5446 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5447 | |
5448 | if (copy_to_user(arg, &info, sizeof(info))) | |
5449 | return -EFAULT; | |
5450 | ||
5451 | return 0; | |
5452 | } | |
5453 | ||
f72ffdd6 | 5454 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
5455 | { |
5456 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5457 | char *ptr, *buf = NULL; | |
5458 | int err = -ENOMEM; | |
5459 | ||
60559da4 | 5460 | file = kmalloc(sizeof(*file), GFP_NOIO); |
2a2275d6 | 5461 | |
32a7627c N |
5462 | if (!file) |
5463 | goto out; | |
5464 | ||
5465 | /* bitmap disabled, zero the first byte and copy out */ | |
1ec885cd | 5466 | if (!mddev->bitmap || !mddev->bitmap->storage.file) { |
32a7627c N |
5467 | file->pathname[0] = '\0'; |
5468 | goto copy_out; | |
5469 | } | |
5470 | ||
5471 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5472 | if (!buf) | |
5473 | goto out; | |
5474 | ||
1ec885cd N |
5475 | ptr = d_path(&mddev->bitmap->storage.file->f_path, |
5476 | buf, sizeof(file->pathname)); | |
6bcfd601 | 5477 | if (IS_ERR(ptr)) |
32a7627c N |
5478 | goto out; |
5479 | ||
5480 | strcpy(file->pathname, ptr); | |
5481 | ||
5482 | copy_out: | |
5483 | err = 0; | |
5484 | if (copy_to_user(arg, file, sizeof(*file))) | |
5485 | err = -EFAULT; | |
5486 | out: | |
5487 | kfree(buf); | |
5488 | kfree(file); | |
5489 | return err; | |
5490 | } | |
5491 | ||
f72ffdd6 | 5492 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
5493 | { |
5494 | mdu_disk_info_t info; | |
3cb03002 | 5495 | struct md_rdev *rdev; |
1da177e4 LT |
5496 | |
5497 | if (copy_from_user(&info, arg, sizeof(info))) | |
5498 | return -EFAULT; | |
5499 | ||
1ca69c4b N |
5500 | rcu_read_lock(); |
5501 | rdev = find_rdev_nr_rcu(mddev, info.number); | |
1da177e4 LT |
5502 | if (rdev) { |
5503 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5504 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5505 | info.raid_disk = rdev->raid_disk; | |
5506 | info.state = 0; | |
b2d444d7 | 5507 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5508 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5509 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5510 | info.state |= (1<<MD_DISK_ACTIVE); |
5511 | info.state |= (1<<MD_DISK_SYNC); | |
5512 | } | |
8ddf9efe N |
5513 | if (test_bit(WriteMostly, &rdev->flags)) |
5514 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5515 | } else { |
5516 | info.major = info.minor = 0; | |
5517 | info.raid_disk = -1; | |
5518 | info.state = (1<<MD_DISK_REMOVED); | |
5519 | } | |
1ca69c4b | 5520 | rcu_read_unlock(); |
1da177e4 LT |
5521 | |
5522 | if (copy_to_user(arg, &info, sizeof(info))) | |
5523 | return -EFAULT; | |
5524 | ||
5525 | return 0; | |
5526 | } | |
5527 | ||
f72ffdd6 | 5528 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5529 | { |
5530 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5531 | struct md_rdev *rdev; |
1da177e4 LT |
5532 | dev_t dev = MKDEV(info->major,info->minor); |
5533 | ||
5534 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5535 | return -EOVERFLOW; | |
5536 | ||
5537 | if (!mddev->raid_disks) { | |
5538 | int err; | |
5539 | /* expecting a device which has a superblock */ | |
5540 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5541 | if (IS_ERR(rdev)) { | |
f72ffdd6 | 5542 | printk(KERN_WARNING |
1da177e4 LT |
5543 | "md: md_import_device returned %ld\n", |
5544 | PTR_ERR(rdev)); | |
5545 | return PTR_ERR(rdev); | |
5546 | } | |
5547 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5548 | struct md_rdev *rdev0 |
5549 | = list_entry(mddev->disks.next, | |
5550 | struct md_rdev, same_set); | |
a9f326eb | 5551 | err = super_types[mddev->major_version] |
1da177e4 LT |
5552 | .load_super(rdev, rdev0, mddev->minor_version); |
5553 | if (err < 0) { | |
f72ffdd6 | 5554 | printk(KERN_WARNING |
1da177e4 | 5555 | "md: %s has different UUID to %s\n", |
f72ffdd6 | 5556 | bdevname(rdev->bdev,b), |
1da177e4 LT |
5557 | bdevname(rdev0->bdev,b2)); |
5558 | export_rdev(rdev); | |
5559 | return -EINVAL; | |
5560 | } | |
5561 | } | |
5562 | err = bind_rdev_to_array(rdev, mddev); | |
5563 | if (err) | |
5564 | export_rdev(rdev); | |
5565 | return err; | |
5566 | } | |
5567 | ||
5568 | /* | |
5569 | * add_new_disk can be used once the array is assembled | |
5570 | * to add "hot spares". They must already have a superblock | |
5571 | * written | |
5572 | */ | |
5573 | if (mddev->pers) { | |
5574 | int err; | |
5575 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5576 | printk(KERN_WARNING |
1da177e4 LT |
5577 | "%s: personality does not support diskops!\n", |
5578 | mdname(mddev)); | |
5579 | return -EINVAL; | |
5580 | } | |
7b1e35f6 N |
5581 | if (mddev->persistent) |
5582 | rdev = md_import_device(dev, mddev->major_version, | |
5583 | mddev->minor_version); | |
5584 | else | |
5585 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 5586 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5587 | printk(KERN_WARNING |
1da177e4 LT |
5588 | "md: md_import_device returned %ld\n", |
5589 | PTR_ERR(rdev)); | |
5590 | return PTR_ERR(rdev); | |
5591 | } | |
1a855a06 | 5592 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5593 | if (!mddev->persistent) { |
5594 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5595 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5596 | rdev->raid_disk = info->raid_disk; |
bf572541 | 5597 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 5598 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 5599 | } else |
41158c7e | 5600 | rdev->raid_disk = -1; |
f466722c | 5601 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
5602 | } else |
5603 | super_types[mddev->major_version]. | |
5604 | validate_super(mddev, rdev); | |
bedd86b7 | 5605 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 5606 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
5607 | /* This was a hot-add request, but events doesn't |
5608 | * match, so reject it. | |
5609 | */ | |
5610 | export_rdev(rdev); | |
5611 | return -EINVAL; | |
5612 | } | |
5613 | ||
b2d444d7 | 5614 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5615 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5616 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5617 | else |
5618 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5619 | |
1da177e4 LT |
5620 | rdev->raid_disk = -1; |
5621 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5622 | if (!err && !mddev->pers->hot_remove_disk) { |
5623 | /* If there is hot_add_disk but no hot_remove_disk | |
5624 | * then added disks for geometry changes, | |
5625 | * and should be added immediately. | |
5626 | */ | |
5627 | super_types[mddev->major_version]. | |
5628 | validate_super(mddev, rdev); | |
5629 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5630 | if (err) | |
5631 | unbind_rdev_from_array(rdev); | |
5632 | } | |
1da177e4 LT |
5633 | if (err) |
5634 | export_rdev(rdev); | |
52664732 | 5635 | else |
00bcb4ac | 5636 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5637 | |
7ceb17e8 | 5638 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
72a23c21 NB |
5639 | if (mddev->degraded) |
5640 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5641 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5642 | if (!err) |
5643 | md_new_event(mddev); | |
005eca5e | 5644 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5645 | return err; |
5646 | } | |
5647 | ||
5648 | /* otherwise, add_new_disk is only allowed | |
5649 | * for major_version==0 superblocks | |
5650 | */ | |
5651 | if (mddev->major_version != 0) { | |
5652 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5653 | mdname(mddev)); | |
5654 | return -EINVAL; | |
5655 | } | |
5656 | ||
5657 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5658 | int err; | |
d710e138 | 5659 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5660 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5661 | printk(KERN_WARNING |
1da177e4 LT |
5662 | "md: error, md_import_device() returned %ld\n", |
5663 | PTR_ERR(rdev)); | |
5664 | return PTR_ERR(rdev); | |
5665 | } | |
5666 | rdev->desc_nr = info->number; | |
5667 | if (info->raid_disk < mddev->raid_disks) | |
5668 | rdev->raid_disk = info->raid_disk; | |
5669 | else | |
5670 | rdev->raid_disk = -1; | |
5671 | ||
1da177e4 | 5672 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5673 | if (info->state & (1<<MD_DISK_SYNC)) |
5674 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5675 | |
8ddf9efe N |
5676 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5677 | set_bit(WriteMostly, &rdev->flags); | |
5678 | ||
1da177e4 LT |
5679 | if (!mddev->persistent) { |
5680 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5681 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5682 | } else | |
57b2caa3 | 5683 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5684 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5685 | |
2bf071bf N |
5686 | err = bind_rdev_to_array(rdev, mddev); |
5687 | if (err) { | |
5688 | export_rdev(rdev); | |
5689 | return err; | |
5690 | } | |
1da177e4 LT |
5691 | } |
5692 | ||
5693 | return 0; | |
5694 | } | |
5695 | ||
f72ffdd6 | 5696 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5697 | { |
5698 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 5699 | struct md_rdev *rdev; |
1da177e4 | 5700 | |
1da177e4 LT |
5701 | rdev = find_rdev(mddev, dev); |
5702 | if (!rdev) | |
5703 | return -ENXIO; | |
5704 | ||
3ea8929d N |
5705 | clear_bit(Blocked, &rdev->flags); |
5706 | remove_and_add_spares(mddev, rdev); | |
5707 | ||
1da177e4 LT |
5708 | if (rdev->raid_disk >= 0) |
5709 | goto busy; | |
5710 | ||
5711 | kick_rdev_from_array(rdev); | |
850b2b42 | 5712 | md_update_sb(mddev, 1); |
d7603b7e | 5713 | md_new_event(mddev); |
1da177e4 LT |
5714 | |
5715 | return 0; | |
5716 | busy: | |
fdefa4d8 | 5717 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5718 | bdevname(rdev->bdev,b), mdname(mddev)); |
5719 | return -EBUSY; | |
5720 | } | |
5721 | ||
f72ffdd6 | 5722 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5723 | { |
5724 | char b[BDEVNAME_SIZE]; | |
5725 | int err; | |
3cb03002 | 5726 | struct md_rdev *rdev; |
1da177e4 LT |
5727 | |
5728 | if (!mddev->pers) | |
5729 | return -ENODEV; | |
5730 | ||
5731 | if (mddev->major_version != 0) { | |
5732 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5733 | " version-0 superblocks.\n", | |
5734 | mdname(mddev)); | |
5735 | return -EINVAL; | |
5736 | } | |
5737 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5738 | printk(KERN_WARNING |
1da177e4 LT |
5739 | "%s: personality does not support diskops!\n", |
5740 | mdname(mddev)); | |
5741 | return -EINVAL; | |
5742 | } | |
5743 | ||
d710e138 | 5744 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5745 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5746 | printk(KERN_WARNING |
1da177e4 LT |
5747 | "md: error, md_import_device() returned %ld\n", |
5748 | PTR_ERR(rdev)); | |
5749 | return -EINVAL; | |
5750 | } | |
5751 | ||
5752 | if (mddev->persistent) | |
57b2caa3 | 5753 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5754 | else |
77304d2a | 5755 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5756 | |
8190e754 | 5757 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5758 | |
b2d444d7 | 5759 | if (test_bit(Faulty, &rdev->flags)) { |
f72ffdd6 | 5760 | printk(KERN_WARNING |
1da177e4 LT |
5761 | "md: can not hot-add faulty %s disk to %s!\n", |
5762 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5763 | err = -EINVAL; | |
5764 | goto abort_export; | |
5765 | } | |
b2d444d7 | 5766 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5767 | rdev->desc_nr = -1; |
5842730d | 5768 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5769 | err = bind_rdev_to_array(rdev, mddev); |
5770 | if (err) | |
5771 | goto abort_export; | |
1da177e4 LT |
5772 | |
5773 | /* | |
5774 | * The rest should better be atomic, we can have disk failures | |
5775 | * noticed in interrupt contexts ... | |
5776 | */ | |
5777 | ||
1da177e4 LT |
5778 | rdev->raid_disk = -1; |
5779 | ||
850b2b42 | 5780 | md_update_sb(mddev, 1); |
1da177e4 LT |
5781 | |
5782 | /* | |
5783 | * Kick recovery, maybe this spare has to be added to the | |
5784 | * array immediately. | |
5785 | */ | |
5786 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5787 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5788 | md_new_event(mddev); |
1da177e4 LT |
5789 | return 0; |
5790 | ||
1da177e4 LT |
5791 | abort_export: |
5792 | export_rdev(rdev); | |
5793 | return err; | |
5794 | } | |
5795 | ||
fd01b88c | 5796 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 5797 | { |
035328c2 | 5798 | int err = 0; |
32a7627c | 5799 | |
36fa3063 | 5800 | if (mddev->pers) { |
d66b1b39 | 5801 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
5802 | return -EBUSY; |
5803 | if (mddev->recovery || mddev->sync_thread) | |
5804 | return -EBUSY; | |
5805 | /* we should be able to change the bitmap.. */ | |
5806 | } | |
32a7627c | 5807 | |
36fa3063 | 5808 | if (fd >= 0) { |
035328c2 | 5809 | struct inode *inode; |
36fa3063 N |
5810 | if (mddev->bitmap) |
5811 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5812 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5813 | |
c3d9714e | 5814 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5815 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5816 | mdname(mddev)); | |
5817 | return -EBADF; | |
5818 | } | |
5819 | ||
035328c2 N |
5820 | inode = mddev->bitmap_info.file->f_mapping->host; |
5821 | if (!S_ISREG(inode->i_mode)) { | |
5822 | printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", | |
5823 | mdname(mddev)); | |
5824 | err = -EBADF; | |
5825 | } else if (!(mddev->bitmap_info.file->f_mode & FMODE_WRITE)) { | |
5826 | printk(KERN_ERR "%s: error: bitmap file must open for write\n", | |
5827 | mdname(mddev)); | |
5828 | err = -EBADF; | |
5829 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
36fa3063 N |
5830 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
5831 | mdname(mddev)); | |
035328c2 N |
5832 | err = -EBUSY; |
5833 | } | |
5834 | if (err) { | |
c3d9714e N |
5835 | fput(mddev->bitmap_info.file); |
5836 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5837 | return err; |
5838 | } | |
c3d9714e | 5839 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5840 | } else if (mddev->bitmap == NULL) |
5841 | return -ENOENT; /* cannot remove what isn't there */ | |
5842 | err = 0; | |
5843 | if (mddev->pers) { | |
5844 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5845 | if (fd >= 0) { |
36fa3063 | 5846 | err = bitmap_create(mddev); |
69e51b44 N |
5847 | if (!err) |
5848 | err = bitmap_load(mddev); | |
5849 | } | |
d7375ab3 | 5850 | if (fd < 0 || err) { |
36fa3063 | 5851 | bitmap_destroy(mddev); |
d7375ab3 N |
5852 | fd = -1; /* make sure to put the file */ |
5853 | } | |
36fa3063 | 5854 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5855 | } |
5856 | if (fd < 0) { | |
035328c2 | 5857 | if (mddev->bitmap_info.file) |
c3d9714e | 5858 | fput(mddev->bitmap_info.file); |
c3d9714e | 5859 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5860 | } |
5861 | ||
32a7627c N |
5862 | return err; |
5863 | } | |
5864 | ||
1da177e4 LT |
5865 | /* |
5866 | * set_array_info is used two different ways | |
5867 | * The original usage is when creating a new array. | |
5868 | * In this usage, raid_disks is > 0 and it together with | |
5869 | * level, size, not_persistent,layout,chunksize determine the | |
5870 | * shape of the array. | |
5871 | * This will always create an array with a type-0.90.0 superblock. | |
5872 | * The newer usage is when assembling an array. | |
5873 | * In this case raid_disks will be 0, and the major_version field is | |
5874 | * use to determine which style super-blocks are to be found on the devices. | |
5875 | * The minor and patch _version numbers are also kept incase the | |
5876 | * super_block handler wishes to interpret them. | |
5877 | */ | |
f72ffdd6 | 5878 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
5879 | { |
5880 | ||
5881 | if (info->raid_disks == 0) { | |
5882 | /* just setting version number for superblock loading */ | |
5883 | if (info->major_version < 0 || | |
50511da3 | 5884 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5885 | super_types[info->major_version].name == NULL) { |
5886 | /* maybe try to auto-load a module? */ | |
f72ffdd6 | 5887 | printk(KERN_INFO |
1da177e4 LT |
5888 | "md: superblock version %d not known\n", |
5889 | info->major_version); | |
5890 | return -EINVAL; | |
5891 | } | |
5892 | mddev->major_version = info->major_version; | |
5893 | mddev->minor_version = info->minor_version; | |
5894 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5895 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5896 | /* ensure mddev_put doesn't delete this now that there |
5897 | * is some minimal configuration. | |
5898 | */ | |
5899 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5900 | return 0; |
5901 | } | |
5902 | mddev->major_version = MD_MAJOR_VERSION; | |
5903 | mddev->minor_version = MD_MINOR_VERSION; | |
5904 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5905 | mddev->ctime = get_seconds(); | |
5906 | ||
5907 | mddev->level = info->level; | |
17115e03 | 5908 | mddev->clevel[0] = 0; |
58c0fed4 | 5909 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5910 | mddev->raid_disks = info->raid_disks; |
5911 | /* don't set md_minor, it is determined by which /dev/md* was | |
5912 | * openned | |
5913 | */ | |
5914 | if (info->state & (1<<MD_SB_CLEAN)) | |
5915 | mddev->recovery_cp = MaxSector; | |
5916 | else | |
5917 | mddev->recovery_cp = 0; | |
5918 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5919 | mddev->external = 0; |
1da177e4 LT |
5920 | |
5921 | mddev->layout = info->layout; | |
9d8f0363 | 5922 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5923 | |
5924 | mddev->max_disks = MD_SB_DISKS; | |
5925 | ||
e691063a N |
5926 | if (mddev->persistent) |
5927 | mddev->flags = 0; | |
850b2b42 | 5928 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5929 | |
c3d9714e | 5930 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 5931 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 5932 | mddev->bitmap_info.offset = 0; |
b2a2703c | 5933 | |
f6705578 N |
5934 | mddev->reshape_position = MaxSector; |
5935 | ||
1da177e4 LT |
5936 | /* |
5937 | * Generate a 128 bit UUID | |
5938 | */ | |
5939 | get_random_bytes(mddev->uuid, 16); | |
5940 | ||
f6705578 | 5941 | mddev->new_level = mddev->level; |
664e7c41 | 5942 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5943 | mddev->new_layout = mddev->layout; |
5944 | mddev->delta_disks = 0; | |
2c810cdd | 5945 | mddev->reshape_backwards = 0; |
f6705578 | 5946 | |
1da177e4 LT |
5947 | return 0; |
5948 | } | |
5949 | ||
fd01b88c | 5950 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 5951 | { |
b522adcd DW |
5952 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5953 | ||
5954 | if (mddev->external_size) | |
5955 | return; | |
5956 | ||
1f403624 DW |
5957 | mddev->array_sectors = array_sectors; |
5958 | } | |
5959 | EXPORT_SYMBOL(md_set_array_sectors); | |
5960 | ||
fd01b88c | 5961 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 5962 | { |
3cb03002 | 5963 | struct md_rdev *rdev; |
a35b0d69 | 5964 | int rv; |
d71f9f88 | 5965 | int fit = (num_sectors == 0); |
a35b0d69 N |
5966 | |
5967 | if (mddev->pers->resize == NULL) | |
5968 | return -EINVAL; | |
d71f9f88 AN |
5969 | /* The "num_sectors" is the number of sectors of each device that |
5970 | * is used. This can only make sense for arrays with redundancy. | |
5971 | * linear and raid0 always use whatever space is available. We can only | |
5972 | * consider changing this number if no resync or reconstruction is | |
5973 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5974 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5975 | * of each device. If num_sectors is zero, we find the largest size |
5976 | * that fits. | |
a35b0d69 | 5977 | */ |
f851b60d N |
5978 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
5979 | mddev->sync_thread) | |
a35b0d69 | 5980 | return -EBUSY; |
bd8839e0 N |
5981 | if (mddev->ro) |
5982 | return -EROFS; | |
a4a6125a | 5983 | |
dafb20fa | 5984 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 5985 | sector_t avail = rdev->sectors; |
01ab5662 | 5986 | |
d71f9f88 AN |
5987 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5988 | num_sectors = avail; | |
5989 | if (avail < num_sectors) | |
a35b0d69 N |
5990 | return -ENOSPC; |
5991 | } | |
d71f9f88 | 5992 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5993 | if (!rv) |
5994 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5995 | return rv; |
5996 | } | |
5997 | ||
fd01b88c | 5998 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
5999 | { |
6000 | int rv; | |
c6563a8c | 6001 | struct md_rdev *rdev; |
da943b99 | 6002 | /* change the number of raid disks */ |
63c70c4f | 6003 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6004 | return -EINVAL; |
bd8839e0 N |
6005 | if (mddev->ro) |
6006 | return -EROFS; | |
da943b99 | 6007 | if (raid_disks <= 0 || |
233fca36 | 6008 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6009 | return -EINVAL; |
f851b60d N |
6010 | if (mddev->sync_thread || |
6011 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6012 | mddev->reshape_position != MaxSector) | |
da943b99 | 6013 | return -EBUSY; |
c6563a8c N |
6014 | |
6015 | rdev_for_each(rdev, mddev) { | |
6016 | if (mddev->raid_disks < raid_disks && | |
6017 | rdev->data_offset < rdev->new_data_offset) | |
6018 | return -EINVAL; | |
6019 | if (mddev->raid_disks > raid_disks && | |
6020 | rdev->data_offset > rdev->new_data_offset) | |
6021 | return -EINVAL; | |
6022 | } | |
6023 | ||
63c70c4f | 6024 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6025 | if (mddev->delta_disks < 0) |
6026 | mddev->reshape_backwards = 1; | |
6027 | else if (mddev->delta_disks > 0) | |
6028 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6029 | |
6030 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6031 | if (rv < 0) { |
de171cb9 | 6032 | mddev->delta_disks = 0; |
2c810cdd N |
6033 | mddev->reshape_backwards = 0; |
6034 | } | |
da943b99 N |
6035 | return rv; |
6036 | } | |
6037 | ||
1da177e4 LT |
6038 | /* |
6039 | * update_array_info is used to change the configuration of an | |
6040 | * on-line array. | |
6041 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6042 | * fields in the info are checked against the array. | |
6043 | * Any differences that cannot be handled will cause an error. | |
6044 | * Normally, only one change can be managed at a time. | |
6045 | */ | |
fd01b88c | 6046 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6047 | { |
6048 | int rv = 0; | |
6049 | int cnt = 0; | |
36fa3063 N |
6050 | int state = 0; |
6051 | ||
6052 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6053 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6054 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6055 | |
6056 | if (mddev->major_version != info->major_version || | |
6057 | mddev->minor_version != info->minor_version || | |
6058 | /* mddev->patch_version != info->patch_version || */ | |
6059 | mddev->ctime != info->ctime || | |
6060 | mddev->level != info->level || | |
6061 | /* mddev->layout != info->layout || */ | |
6062 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 6063 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6064 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6065 | ((state^info->state) & 0xfffffe00) | |
6066 | ) | |
1da177e4 LT |
6067 | return -EINVAL; |
6068 | /* Check there is only one change */ | |
58c0fed4 AN |
6069 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6070 | cnt++; | |
6071 | if (mddev->raid_disks != info->raid_disks) | |
6072 | cnt++; | |
6073 | if (mddev->layout != info->layout) | |
6074 | cnt++; | |
6075 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6076 | cnt++; | |
6077 | if (cnt == 0) | |
6078 | return 0; | |
6079 | if (cnt > 1) | |
6080 | return -EINVAL; | |
1da177e4 LT |
6081 | |
6082 | if (mddev->layout != info->layout) { | |
6083 | /* Change layout | |
6084 | * we don't need to do anything at the md level, the | |
6085 | * personality will take care of it all. | |
6086 | */ | |
50ac168a | 6087 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6088 | return -EINVAL; |
597a711b N |
6089 | else { |
6090 | mddev->new_layout = info->layout; | |
50ac168a | 6091 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6092 | if (rv) |
6093 | mddev->new_layout = mddev->layout; | |
6094 | return rv; | |
6095 | } | |
1da177e4 | 6096 | } |
58c0fed4 | 6097 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6098 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6099 | |
da943b99 N |
6100 | if (mddev->raid_disks != info->raid_disks) |
6101 | rv = update_raid_disks(mddev, info->raid_disks); | |
6102 | ||
36fa3063 | 6103 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
d66b1b39 | 6104 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) |
36fa3063 N |
6105 | return -EINVAL; |
6106 | if (mddev->recovery || mddev->sync_thread) | |
6107 | return -EBUSY; | |
6108 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
6109 | /* add the bitmap */ | |
6110 | if (mddev->bitmap) | |
6111 | return -EEXIST; | |
c3d9714e | 6112 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 6113 | return -EINVAL; |
c3d9714e N |
6114 | mddev->bitmap_info.offset = |
6115 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6116 | mddev->bitmap_info.space = |
6117 | mddev->bitmap_info.default_space; | |
36fa3063 N |
6118 | mddev->pers->quiesce(mddev, 1); |
6119 | rv = bitmap_create(mddev); | |
69e51b44 N |
6120 | if (!rv) |
6121 | rv = bitmap_load(mddev); | |
36fa3063 N |
6122 | if (rv) |
6123 | bitmap_destroy(mddev); | |
6124 | mddev->pers->quiesce(mddev, 0); | |
6125 | } else { | |
6126 | /* remove the bitmap */ | |
6127 | if (!mddev->bitmap) | |
6128 | return -ENOENT; | |
1ec885cd | 6129 | if (mddev->bitmap->storage.file) |
36fa3063 N |
6130 | return -EINVAL; |
6131 | mddev->pers->quiesce(mddev, 1); | |
6132 | bitmap_destroy(mddev); | |
6133 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6134 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6135 | } |
6136 | } | |
850b2b42 | 6137 | md_update_sb(mddev, 1); |
1da177e4 LT |
6138 | return rv; |
6139 | } | |
6140 | ||
fd01b88c | 6141 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6142 | { |
3cb03002 | 6143 | struct md_rdev *rdev; |
1ca69c4b | 6144 | int err = 0; |
1da177e4 LT |
6145 | |
6146 | if (mddev->pers == NULL) | |
6147 | return -ENODEV; | |
6148 | ||
1ca69c4b N |
6149 | rcu_read_lock(); |
6150 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6151 | if (!rdev) |
1ca69c4b N |
6152 | err = -ENODEV; |
6153 | else { | |
6154 | md_error(mddev, rdev); | |
6155 | if (!test_bit(Faulty, &rdev->flags)) | |
6156 | err = -EBUSY; | |
6157 | } | |
6158 | rcu_read_unlock(); | |
6159 | return err; | |
1da177e4 LT |
6160 | } |
6161 | ||
2f9618ce AN |
6162 | /* |
6163 | * We have a problem here : there is no easy way to give a CHS | |
6164 | * virtual geometry. We currently pretend that we have a 2 heads | |
6165 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6166 | * dosfs just mad... ;-) | |
6167 | */ | |
a885c8c4 CH |
6168 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6169 | { | |
fd01b88c | 6170 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6171 | |
6172 | geo->heads = 2; | |
6173 | geo->sectors = 4; | |
49ce6cea | 6174 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6175 | return 0; |
6176 | } | |
6177 | ||
cb335f88 NS |
6178 | static inline bool md_ioctl_valid(unsigned int cmd) |
6179 | { | |
6180 | switch (cmd) { | |
6181 | case ADD_NEW_DISK: | |
6182 | case BLKROSET: | |
6183 | case GET_ARRAY_INFO: | |
6184 | case GET_BITMAP_FILE: | |
6185 | case GET_DISK_INFO: | |
6186 | case HOT_ADD_DISK: | |
6187 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
6188 | case RAID_AUTORUN: |
6189 | case RAID_VERSION: | |
6190 | case RESTART_ARRAY_RW: | |
6191 | case RUN_ARRAY: | |
6192 | case SET_ARRAY_INFO: | |
6193 | case SET_BITMAP_FILE: | |
6194 | case SET_DISK_FAULTY: | |
6195 | case STOP_ARRAY: | |
6196 | case STOP_ARRAY_RO: | |
6197 | return true; | |
6198 | default: | |
6199 | return false; | |
6200 | } | |
6201 | } | |
6202 | ||
a39907fa | 6203 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6204 | unsigned int cmd, unsigned long arg) |
6205 | { | |
6206 | int err = 0; | |
6207 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6208 | struct mddev *mddev = NULL; |
e2218350 | 6209 | int ro; |
1da177e4 | 6210 | |
cb335f88 NS |
6211 | if (!md_ioctl_valid(cmd)) |
6212 | return -ENOTTY; | |
6213 | ||
506c9e44 N |
6214 | switch (cmd) { |
6215 | case RAID_VERSION: | |
6216 | case GET_ARRAY_INFO: | |
6217 | case GET_DISK_INFO: | |
6218 | break; | |
6219 | default: | |
6220 | if (!capable(CAP_SYS_ADMIN)) | |
6221 | return -EACCES; | |
6222 | } | |
1da177e4 LT |
6223 | |
6224 | /* | |
6225 | * Commands dealing with the RAID driver but not any | |
6226 | * particular array: | |
6227 | */ | |
c02c0aeb N |
6228 | switch (cmd) { |
6229 | case RAID_VERSION: | |
6230 | err = get_version(argp); | |
3adc28d8 | 6231 | goto out; |
1da177e4 | 6232 | |
1da177e4 | 6233 | #ifndef MODULE |
c02c0aeb N |
6234 | case RAID_AUTORUN: |
6235 | err = 0; | |
6236 | autostart_arrays(arg); | |
3adc28d8 | 6237 | goto out; |
1da177e4 | 6238 | #endif |
c02c0aeb | 6239 | default:; |
1da177e4 LT |
6240 | } |
6241 | ||
6242 | /* | |
6243 | * Commands creating/starting a new array: | |
6244 | */ | |
6245 | ||
a39907fa | 6246 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6247 | |
6248 | if (!mddev) { | |
6249 | BUG(); | |
3adc28d8 | 6250 | goto out; |
1da177e4 LT |
6251 | } |
6252 | ||
1ca69c4b N |
6253 | /* Some actions do not requires the mutex */ |
6254 | switch (cmd) { | |
6255 | case GET_ARRAY_INFO: | |
6256 | if (!mddev->raid_disks && !mddev->external) | |
6257 | err = -ENODEV; | |
6258 | else | |
6259 | err = get_array_info(mddev, argp); | |
3adc28d8 | 6260 | goto out; |
1ca69c4b N |
6261 | |
6262 | case GET_DISK_INFO: | |
6263 | if (!mddev->raid_disks && !mddev->external) | |
6264 | err = -ENODEV; | |
6265 | else | |
6266 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 6267 | goto out; |
1ca69c4b N |
6268 | |
6269 | case SET_DISK_FAULTY: | |
6270 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6271 | goto out; |
1ca69c4b N |
6272 | } |
6273 | ||
a7a3f08d N |
6274 | if (cmd == ADD_NEW_DISK) |
6275 | /* need to ensure md_delayed_delete() has completed */ | |
6276 | flush_workqueue(md_misc_wq); | |
6277 | ||
90f5f7ad HR |
6278 | if (cmd == HOT_REMOVE_DISK) |
6279 | /* need to ensure recovery thread has run */ | |
6280 | wait_event_interruptible_timeout(mddev->sb_wait, | |
6281 | !test_bit(MD_RECOVERY_NEEDED, | |
6282 | &mddev->flags), | |
6283 | msecs_to_jiffies(5000)); | |
260fa034 N |
6284 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
6285 | /* Need to flush page cache, and ensure no-one else opens | |
6286 | * and writes | |
6287 | */ | |
6288 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 6289 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
6290 | mutex_unlock(&mddev->open_mutex); |
6291 | err = -EBUSY; | |
3adc28d8 | 6292 | goto out; |
260fa034 N |
6293 | } |
6294 | set_bit(MD_STILL_CLOSED, &mddev->flags); | |
6295 | mutex_unlock(&mddev->open_mutex); | |
6296 | sync_blockdev(bdev); | |
6297 | } | |
1da177e4 LT |
6298 | err = mddev_lock(mddev); |
6299 | if (err) { | |
f72ffdd6 | 6300 | printk(KERN_INFO |
1da177e4 LT |
6301 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
6302 | err, cmd); | |
3adc28d8 | 6303 | goto out; |
1da177e4 LT |
6304 | } |
6305 | ||
c02c0aeb N |
6306 | if (cmd == SET_ARRAY_INFO) { |
6307 | mdu_array_info_t info; | |
6308 | if (!arg) | |
6309 | memset(&info, 0, sizeof(info)); | |
6310 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6311 | err = -EFAULT; | |
3adc28d8 | 6312 | goto unlock; |
c02c0aeb N |
6313 | } |
6314 | if (mddev->pers) { | |
6315 | err = update_array_info(mddev, &info); | |
6316 | if (err) { | |
6317 | printk(KERN_WARNING "md: couldn't update" | |
6318 | " array info. %d\n", err); | |
3adc28d8 | 6319 | goto unlock; |
1da177e4 | 6320 | } |
3adc28d8 | 6321 | goto unlock; |
c02c0aeb N |
6322 | } |
6323 | if (!list_empty(&mddev->disks)) { | |
6324 | printk(KERN_WARNING | |
6325 | "md: array %s already has disks!\n", | |
6326 | mdname(mddev)); | |
6327 | err = -EBUSY; | |
3adc28d8 | 6328 | goto unlock; |
c02c0aeb N |
6329 | } |
6330 | if (mddev->raid_disks) { | |
6331 | printk(KERN_WARNING | |
6332 | "md: array %s already initialised!\n", | |
6333 | mdname(mddev)); | |
6334 | err = -EBUSY; | |
3adc28d8 | 6335 | goto unlock; |
c02c0aeb N |
6336 | } |
6337 | err = set_array_info(mddev, &info); | |
6338 | if (err) { | |
6339 | printk(KERN_WARNING "md: couldn't set" | |
6340 | " array info. %d\n", err); | |
3adc28d8 | 6341 | goto unlock; |
c02c0aeb | 6342 | } |
3adc28d8 | 6343 | goto unlock; |
1da177e4 LT |
6344 | } |
6345 | ||
6346 | /* | |
6347 | * Commands querying/configuring an existing array: | |
6348 | */ | |
32a7627c | 6349 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6350 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6351 | if ((!mddev->raid_disks && !mddev->external) |
6352 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6353 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6354 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 6355 | err = -ENODEV; |
3adc28d8 | 6356 | goto unlock; |
1da177e4 LT |
6357 | } |
6358 | ||
6359 | /* | |
6360 | * Commands even a read-only array can execute: | |
6361 | */ | |
c02c0aeb N |
6362 | switch (cmd) { |
6363 | case GET_BITMAP_FILE: | |
6364 | err = get_bitmap_file(mddev, argp); | |
3adc28d8 | 6365 | goto unlock; |
32a7627c | 6366 | |
c02c0aeb N |
6367 | case RESTART_ARRAY_RW: |
6368 | err = restart_array(mddev); | |
3adc28d8 | 6369 | goto unlock; |
1da177e4 | 6370 | |
c02c0aeb N |
6371 | case STOP_ARRAY: |
6372 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 6373 | goto unlock; |
1da177e4 | 6374 | |
c02c0aeb N |
6375 | case STOP_ARRAY_RO: |
6376 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 6377 | goto unlock; |
1da177e4 | 6378 | |
3ea8929d N |
6379 | case HOT_REMOVE_DISK: |
6380 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6381 | goto unlock; |
3ea8929d | 6382 | |
7ceb17e8 N |
6383 | case ADD_NEW_DISK: |
6384 | /* We can support ADD_NEW_DISK on read-only arrays | |
6385 | * on if we are re-adding a preexisting device. | |
6386 | * So require mddev->pers and MD_DISK_SYNC. | |
6387 | */ | |
6388 | if (mddev->pers) { | |
6389 | mdu_disk_info_t info; | |
6390 | if (copy_from_user(&info, argp, sizeof(info))) | |
6391 | err = -EFAULT; | |
6392 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6393 | /* Need to clear read-only for this */ | |
6394 | break; | |
6395 | else | |
6396 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6397 | goto unlock; |
7ceb17e8 N |
6398 | } |
6399 | break; | |
6400 | ||
c02c0aeb N |
6401 | case BLKROSET: |
6402 | if (get_user(ro, (int __user *)(arg))) { | |
6403 | err = -EFAULT; | |
3adc28d8 | 6404 | goto unlock; |
c02c0aeb N |
6405 | } |
6406 | err = -EINVAL; | |
e2218350 | 6407 | |
c02c0aeb N |
6408 | /* if the bdev is going readonly the value of mddev->ro |
6409 | * does not matter, no writes are coming | |
6410 | */ | |
6411 | if (ro) | |
3adc28d8 | 6412 | goto unlock; |
e2218350 | 6413 | |
c02c0aeb N |
6414 | /* are we are already prepared for writes? */ |
6415 | if (mddev->ro != 1) | |
3adc28d8 | 6416 | goto unlock; |
e2218350 | 6417 | |
c02c0aeb N |
6418 | /* transitioning to readauto need only happen for |
6419 | * arrays that call md_write_start | |
6420 | */ | |
6421 | if (mddev->pers) { | |
6422 | err = restart_array(mddev); | |
6423 | if (err == 0) { | |
6424 | mddev->ro = 2; | |
6425 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6426 | } |
c02c0aeb | 6427 | } |
3adc28d8 | 6428 | goto unlock; |
1da177e4 LT |
6429 | } |
6430 | ||
6431 | /* | |
6432 | * The remaining ioctls are changing the state of the | |
f91de92e | 6433 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 6434 | */ |
326eb17d | 6435 | if (mddev->ro && mddev->pers) { |
f91de92e N |
6436 | if (mddev->ro == 2) { |
6437 | mddev->ro = 0; | |
00bcb4ac | 6438 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6439 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6440 | /* mddev_unlock will wake thread */ |
6441 | /* If a device failed while we were read-only, we | |
6442 | * need to make sure the metadata is updated now. | |
6443 | */ | |
6444 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6445 | mddev_unlock(mddev); | |
6446 | wait_event(mddev->sb_wait, | |
6447 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6448 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
29f097c4 | 6449 | mddev_lock_nointr(mddev); |
f3378b48 | 6450 | } |
f91de92e N |
6451 | } else { |
6452 | err = -EROFS; | |
3adc28d8 | 6453 | goto unlock; |
f91de92e | 6454 | } |
1da177e4 LT |
6455 | } |
6456 | ||
c02c0aeb N |
6457 | switch (cmd) { |
6458 | case ADD_NEW_DISK: | |
1da177e4 | 6459 | { |
c02c0aeb N |
6460 | mdu_disk_info_t info; |
6461 | if (copy_from_user(&info, argp, sizeof(info))) | |
6462 | err = -EFAULT; | |
6463 | else | |
6464 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6465 | goto unlock; |
c02c0aeb | 6466 | } |
1da177e4 | 6467 | |
c02c0aeb N |
6468 | case HOT_ADD_DISK: |
6469 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6470 | goto unlock; |
1da177e4 | 6471 | |
c02c0aeb N |
6472 | case RUN_ARRAY: |
6473 | err = do_md_run(mddev); | |
3adc28d8 | 6474 | goto unlock; |
1da177e4 | 6475 | |
c02c0aeb N |
6476 | case SET_BITMAP_FILE: |
6477 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 6478 | goto unlock; |
32a7627c | 6479 | |
c02c0aeb N |
6480 | default: |
6481 | err = -EINVAL; | |
3adc28d8 | 6482 | goto unlock; |
1da177e4 LT |
6483 | } |
6484 | ||
3adc28d8 | 6485 | unlock: |
d3374825 N |
6486 | if (mddev->hold_active == UNTIL_IOCTL && |
6487 | err != -EINVAL) | |
6488 | mddev->hold_active = 0; | |
1da177e4 | 6489 | mddev_unlock(mddev); |
3adc28d8 | 6490 | out: |
1da177e4 LT |
6491 | return err; |
6492 | } | |
aa98aa31 AB |
6493 | #ifdef CONFIG_COMPAT |
6494 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6495 | unsigned int cmd, unsigned long arg) | |
6496 | { | |
6497 | switch (cmd) { | |
6498 | case HOT_REMOVE_DISK: | |
6499 | case HOT_ADD_DISK: | |
6500 | case SET_DISK_FAULTY: | |
6501 | case SET_BITMAP_FILE: | |
6502 | /* These take in integer arg, do not convert */ | |
6503 | break; | |
6504 | default: | |
6505 | arg = (unsigned long)compat_ptr(arg); | |
6506 | break; | |
6507 | } | |
6508 | ||
6509 | return md_ioctl(bdev, mode, cmd, arg); | |
6510 | } | |
6511 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6512 | |
a39907fa | 6513 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6514 | { |
6515 | /* | |
6516 | * Succeed if we can lock the mddev, which confirms that | |
6517 | * it isn't being stopped right now. | |
6518 | */ | |
fd01b88c | 6519 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6520 | int err; |
6521 | ||
0c098220 YL |
6522 | if (!mddev) |
6523 | return -ENODEV; | |
6524 | ||
d3374825 N |
6525 | if (mddev->gendisk != bdev->bd_disk) { |
6526 | /* we are racing with mddev_put which is discarding this | |
6527 | * bd_disk. | |
6528 | */ | |
6529 | mddev_put(mddev); | |
6530 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6531 | flush_workqueue(md_misc_wq); |
d3374825 N |
6532 | /* Then retry the open from the top */ |
6533 | return -ERESTARTSYS; | |
6534 | } | |
6535 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6536 | ||
c8c00a69 | 6537 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6538 | goto out; |
6539 | ||
6540 | err = 0; | |
f2ea68cf | 6541 | atomic_inc(&mddev->openers); |
260fa034 | 6542 | clear_bit(MD_STILL_CLOSED, &mddev->flags); |
c8c00a69 | 6543 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6544 | |
f0b4f7e2 | 6545 | check_disk_change(bdev); |
1da177e4 LT |
6546 | out: |
6547 | return err; | |
6548 | } | |
6549 | ||
db2a144b | 6550 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6551 | { |
f72ffdd6 | 6552 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6553 | |
52e5f9d1 | 6554 | BUG_ON(!mddev); |
f2ea68cf | 6555 | atomic_dec(&mddev->openers); |
1da177e4 | 6556 | mddev_put(mddev); |
1da177e4 | 6557 | } |
f0b4f7e2 N |
6558 | |
6559 | static int md_media_changed(struct gendisk *disk) | |
6560 | { | |
fd01b88c | 6561 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6562 | |
6563 | return mddev->changed; | |
6564 | } | |
6565 | ||
6566 | static int md_revalidate(struct gendisk *disk) | |
6567 | { | |
fd01b88c | 6568 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6569 | |
6570 | mddev->changed = 0; | |
6571 | return 0; | |
6572 | } | |
83d5cde4 | 6573 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6574 | { |
6575 | .owner = THIS_MODULE, | |
a39907fa AV |
6576 | .open = md_open, |
6577 | .release = md_release, | |
b492b852 | 6578 | .ioctl = md_ioctl, |
aa98aa31 AB |
6579 | #ifdef CONFIG_COMPAT |
6580 | .compat_ioctl = md_compat_ioctl, | |
6581 | #endif | |
a885c8c4 | 6582 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6583 | .media_changed = md_media_changed, |
6584 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6585 | }; |
6586 | ||
f72ffdd6 | 6587 | static int md_thread(void *arg) |
1da177e4 | 6588 | { |
2b8bf345 | 6589 | struct md_thread *thread = arg; |
1da177e4 | 6590 | |
1da177e4 LT |
6591 | /* |
6592 | * md_thread is a 'system-thread', it's priority should be very | |
6593 | * high. We avoid resource deadlocks individually in each | |
6594 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6595 | * the very same RT priority as kswapd, thus we will never get | |
6596 | * into a priority inversion deadlock. | |
6597 | * | |
6598 | * we definitely have to have equal or higher priority than | |
6599 | * bdflush, otherwise bdflush will deadlock if there are too | |
6600 | * many dirty RAID5 blocks. | |
6601 | */ | |
1da177e4 | 6602 | |
6985c43f | 6603 | allow_signal(SIGKILL); |
a6fb0934 | 6604 | while (!kthread_should_stop()) { |
1da177e4 | 6605 | |
93588e22 N |
6606 | /* We need to wait INTERRUPTIBLE so that |
6607 | * we don't add to the load-average. | |
6608 | * That means we need to be sure no signals are | |
6609 | * pending | |
6610 | */ | |
6611 | if (signal_pending(current)) | |
6612 | flush_signals(current); | |
6613 | ||
6614 | wait_event_interruptible_timeout | |
6615 | (thread->wqueue, | |
6616 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6617 | || kthread_should_stop(), | |
6618 | thread->timeout); | |
1da177e4 | 6619 | |
6c987910 N |
6620 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6621 | if (!kthread_should_stop()) | |
4ed8731d | 6622 | thread->run(thread); |
1da177e4 | 6623 | } |
a6fb0934 | 6624 | |
1da177e4 LT |
6625 | return 0; |
6626 | } | |
6627 | ||
2b8bf345 | 6628 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
6629 | { |
6630 | if (thread) { | |
36a4e1fe | 6631 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
6632 | set_bit(THREAD_WAKEUP, &thread->flags); |
6633 | wake_up(&thread->wqueue); | |
6634 | } | |
6635 | } | |
6c144d31 | 6636 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 6637 | |
4ed8731d SL |
6638 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
6639 | struct mddev *mddev, const char *name) | |
1da177e4 | 6640 | { |
2b8bf345 | 6641 | struct md_thread *thread; |
1da177e4 | 6642 | |
2b8bf345 | 6643 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
6644 | if (!thread) |
6645 | return NULL; | |
6646 | ||
1da177e4 LT |
6647 | init_waitqueue_head(&thread->wqueue); |
6648 | ||
1da177e4 LT |
6649 | thread->run = run; |
6650 | thread->mddev = mddev; | |
32a7627c | 6651 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6652 | thread->tsk = kthread_run(md_thread, thread, |
6653 | "%s_%s", | |
6654 | mdname(thread->mddev), | |
0232605d | 6655 | name); |
a6fb0934 | 6656 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6657 | kfree(thread); |
6658 | return NULL; | |
6659 | } | |
1da177e4 LT |
6660 | return thread; |
6661 | } | |
6c144d31 | 6662 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 6663 | |
2b8bf345 | 6664 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 6665 | { |
2b8bf345 | 6666 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
6667 | if (!thread) |
6668 | return; | |
36a4e1fe | 6669 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
6670 | /* Locking ensures that mddev_unlock does not wake_up a |
6671 | * non-existent thread | |
6672 | */ | |
6673 | spin_lock(&pers_lock); | |
6674 | *threadp = NULL; | |
6675 | spin_unlock(&pers_lock); | |
a6fb0934 N |
6676 | |
6677 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6678 | kfree(thread); |
6679 | } | |
6c144d31 | 6680 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 6681 | |
fd01b88c | 6682 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 6683 | { |
b2d444d7 | 6684 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6685 | return; |
6bfe0b49 | 6686 | |
de393cde | 6687 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
6688 | return; |
6689 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6690 | if (mddev->degraded) |
6691 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6692 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6693 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6694 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6695 | md_wakeup_thread(mddev->thread); | |
768a418d | 6696 | if (mddev->event_work.func) |
e804ac78 | 6697 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6698 | md_new_event_inintr(mddev); |
1da177e4 | 6699 | } |
6c144d31 | 6700 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
6701 | |
6702 | /* seq_file implementation /proc/mdstat */ | |
6703 | ||
6704 | static void status_unused(struct seq_file *seq) | |
6705 | { | |
6706 | int i = 0; | |
3cb03002 | 6707 | struct md_rdev *rdev; |
1da177e4 LT |
6708 | |
6709 | seq_printf(seq, "unused devices: "); | |
6710 | ||
159ec1fc | 6711 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6712 | char b[BDEVNAME_SIZE]; |
6713 | i++; | |
6714 | seq_printf(seq, "%s ", | |
6715 | bdevname(rdev->bdev,b)); | |
6716 | } | |
6717 | if (!i) | |
6718 | seq_printf(seq, "<none>"); | |
6719 | ||
6720 | seq_printf(seq, "\n"); | |
6721 | } | |
6722 | ||
f72ffdd6 | 6723 | static void status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 6724 | { |
dd71cf6b N |
6725 | sector_t max_sectors, resync, res; |
6726 | unsigned long dt, db; | |
6727 | sector_t rt; | |
4588b42e N |
6728 | int scale; |
6729 | unsigned int per_milli; | |
1da177e4 | 6730 | |
72f36d59 N |
6731 | if (mddev->curr_resync <= 3) |
6732 | resync = 0; | |
6733 | else | |
6734 | resync = mddev->curr_resync | |
6735 | - atomic_read(&mddev->recovery_active); | |
1da177e4 | 6736 | |
c804cdec N |
6737 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
6738 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 6739 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6740 | else |
dd71cf6b | 6741 | max_sectors = mddev->dev_sectors; |
1da177e4 | 6742 | |
403df478 | 6743 | WARN_ON(max_sectors == 0); |
4588b42e | 6744 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6745 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6746 | * u32, as those are the requirements for sector_div. |
6747 | * Thus 'scale' must be at least 10 | |
6748 | */ | |
6749 | scale = 10; | |
6750 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6751 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6752 | scale++; |
6753 | } | |
6754 | res = (resync>>scale)*1000; | |
dd71cf6b | 6755 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6756 | |
6757 | per_milli = res; | |
1da177e4 | 6758 | { |
4588b42e | 6759 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6760 | seq_printf(seq, "["); |
6761 | for (i = 0; i < x; i++) | |
6762 | seq_printf(seq, "="); | |
6763 | seq_printf(seq, ">"); | |
6764 | for (i = 0; i < y; i++) | |
6765 | seq_printf(seq, "."); | |
6766 | seq_printf(seq, "] "); | |
6767 | } | |
4588b42e | 6768 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6769 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6770 | "reshape" : | |
61df9d91 N |
6771 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6772 | "check" : | |
6773 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6774 | "resync" : "recovery"))), | |
6775 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6776 | (unsigned long long) resync/2, |
6777 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6778 | |
6779 | /* | |
1da177e4 LT |
6780 | * dt: time from mark until now |
6781 | * db: blocks written from mark until now | |
6782 | * rt: remaining time | |
dd71cf6b N |
6783 | * |
6784 | * rt is a sector_t, so could be 32bit or 64bit. | |
6785 | * So we divide before multiply in case it is 32bit and close | |
6786 | * to the limit. | |
25985edc | 6787 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6788 | * near the end of resync when the number of remaining sectors |
6789 | * is close to 'db'. | |
6790 | * We then divide rt by 32 after multiplying by db to compensate. | |
6791 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6792 | */ |
6793 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6794 | if (!dt) dt++; | |
ff4e8d9a N |
6795 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6796 | - mddev->resync_mark_cnt; | |
1da177e4 | 6797 | |
dd71cf6b N |
6798 | rt = max_sectors - resync; /* number of remaining sectors */ |
6799 | sector_div(rt, db/32+1); | |
6800 | rt *= dt; | |
6801 | rt >>= 5; | |
6802 | ||
6803 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6804 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6805 | |
ff4e8d9a | 6806 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6807 | } |
6808 | ||
6809 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6810 | { | |
6811 | struct list_head *tmp; | |
6812 | loff_t l = *pos; | |
fd01b88c | 6813 | struct mddev *mddev; |
1da177e4 LT |
6814 | |
6815 | if (l >= 0x10000) | |
6816 | return NULL; | |
6817 | if (!l--) | |
6818 | /* header */ | |
6819 | return (void*)1; | |
6820 | ||
6821 | spin_lock(&all_mddevs_lock); | |
6822 | list_for_each(tmp,&all_mddevs) | |
6823 | if (!l--) { | |
fd01b88c | 6824 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
6825 | mddev_get(mddev); |
6826 | spin_unlock(&all_mddevs_lock); | |
6827 | return mddev; | |
6828 | } | |
6829 | spin_unlock(&all_mddevs_lock); | |
6830 | if (!l--) | |
6831 | return (void*)2;/* tail */ | |
6832 | return NULL; | |
6833 | } | |
6834 | ||
6835 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6836 | { | |
6837 | struct list_head *tmp; | |
fd01b88c | 6838 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 6839 | |
1da177e4 LT |
6840 | ++*pos; |
6841 | if (v == (void*)2) | |
6842 | return NULL; | |
6843 | ||
6844 | spin_lock(&all_mddevs_lock); | |
6845 | if (v == (void*)1) | |
6846 | tmp = all_mddevs.next; | |
6847 | else | |
6848 | tmp = mddev->all_mddevs.next; | |
6849 | if (tmp != &all_mddevs) | |
fd01b88c | 6850 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
6851 | else { |
6852 | next_mddev = (void*)2; | |
6853 | *pos = 0x10000; | |
f72ffdd6 | 6854 | } |
1da177e4 LT |
6855 | spin_unlock(&all_mddevs_lock); |
6856 | ||
6857 | if (v != (void*)1) | |
6858 | mddev_put(mddev); | |
6859 | return next_mddev; | |
6860 | ||
6861 | } | |
6862 | ||
6863 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6864 | { | |
fd01b88c | 6865 | struct mddev *mddev = v; |
1da177e4 LT |
6866 | |
6867 | if (mddev && v != (void*)1 && v != (void*)2) | |
6868 | mddev_put(mddev); | |
6869 | } | |
6870 | ||
6871 | static int md_seq_show(struct seq_file *seq, void *v) | |
6872 | { | |
fd01b88c | 6873 | struct mddev *mddev = v; |
dd8ac336 | 6874 | sector_t sectors; |
3cb03002 | 6875 | struct md_rdev *rdev; |
1da177e4 LT |
6876 | |
6877 | if (v == (void*)1) { | |
84fc4b56 | 6878 | struct md_personality *pers; |
1da177e4 LT |
6879 | seq_printf(seq, "Personalities : "); |
6880 | spin_lock(&pers_lock); | |
2604b703 N |
6881 | list_for_each_entry(pers, &pers_list, list) |
6882 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6883 | |
6884 | spin_unlock(&pers_lock); | |
6885 | seq_printf(seq, "\n"); | |
f1514638 | 6886 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
6887 | return 0; |
6888 | } | |
6889 | if (v == (void*)2) { | |
6890 | status_unused(seq); | |
6891 | return 0; | |
6892 | } | |
6893 | ||
5dc5cf7d | 6894 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6895 | return -EINTR; |
5dc5cf7d | 6896 | |
1da177e4 LT |
6897 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6898 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6899 | mddev->pers ? "" : "in"); | |
6900 | if (mddev->pers) { | |
f91de92e | 6901 | if (mddev->ro==1) |
1da177e4 | 6902 | seq_printf(seq, " (read-only)"); |
f91de92e | 6903 | if (mddev->ro==2) |
52720ae7 | 6904 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6905 | seq_printf(seq, " %s", mddev->pers->name); |
6906 | } | |
6907 | ||
dd8ac336 | 6908 | sectors = 0; |
dafb20fa | 6909 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
6910 | char b[BDEVNAME_SIZE]; |
6911 | seq_printf(seq, " %s[%d]", | |
6912 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6913 | if (test_bit(WriteMostly, &rdev->flags)) |
6914 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6915 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6916 | seq_printf(seq, "(F)"); |
6917 | continue; | |
2d78f8c4 N |
6918 | } |
6919 | if (rdev->raid_disk < 0) | |
b325a32e | 6920 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
6921 | if (test_bit(Replacement, &rdev->flags)) |
6922 | seq_printf(seq, "(R)"); | |
dd8ac336 | 6923 | sectors += rdev->sectors; |
1da177e4 LT |
6924 | } |
6925 | ||
6926 | if (!list_empty(&mddev->disks)) { | |
6927 | if (mddev->pers) | |
6928 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6929 | (unsigned long long) |
6930 | mddev->array_sectors / 2); | |
1da177e4 LT |
6931 | else |
6932 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6933 | (unsigned long long)sectors / 2); |
1da177e4 | 6934 | } |
1cd6bf19 N |
6935 | if (mddev->persistent) { |
6936 | if (mddev->major_version != 0 || | |
6937 | mddev->minor_version != 90) { | |
6938 | seq_printf(seq," super %d.%d", | |
6939 | mddev->major_version, | |
6940 | mddev->minor_version); | |
6941 | } | |
e691063a N |
6942 | } else if (mddev->external) |
6943 | seq_printf(seq, " super external:%s", | |
6944 | mddev->metadata_type); | |
6945 | else | |
1cd6bf19 | 6946 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6947 | |
6948 | if (mddev->pers) { | |
d710e138 | 6949 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 6950 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6951 | if (mddev->pers->sync_request) { |
6952 | if (mddev->curr_resync > 2) { | |
d710e138 | 6953 | status_resync(seq, mddev); |
8e1b39d6 | 6954 | seq_printf(seq, "\n "); |
72f36d59 | 6955 | } else if (mddev->curr_resync >= 1) |
8e1b39d6 N |
6956 | seq_printf(seq, "\tresync=DELAYED\n "); |
6957 | else if (mddev->recovery_cp < MaxSector) | |
6958 | seq_printf(seq, "\tresync=PENDING\n "); | |
6959 | } | |
32a7627c N |
6960 | } else |
6961 | seq_printf(seq, "\n "); | |
6962 | ||
57148964 | 6963 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
6964 | |
6965 | seq_printf(seq, "\n"); | |
6966 | } | |
6967 | mddev_unlock(mddev); | |
f72ffdd6 | 6968 | |
1da177e4 LT |
6969 | return 0; |
6970 | } | |
6971 | ||
110518bc | 6972 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6973 | .start = md_seq_start, |
6974 | .next = md_seq_next, | |
6975 | .stop = md_seq_stop, | |
6976 | .show = md_seq_show, | |
6977 | }; | |
6978 | ||
6979 | static int md_seq_open(struct inode *inode, struct file *file) | |
6980 | { | |
f1514638 | 6981 | struct seq_file *seq; |
1da177e4 LT |
6982 | int error; |
6983 | ||
6984 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 6985 | if (error) |
f1514638 KS |
6986 | return error; |
6987 | ||
6988 | seq = file->private_data; | |
6989 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
6990 | return error; |
6991 | } | |
6992 | ||
e2f23b60 | 6993 | static int md_unloading; |
d7603b7e N |
6994 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6995 | { | |
f1514638 | 6996 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
6997 | int mask; |
6998 | ||
e2f23b60 | 6999 | if (md_unloading) |
7d7e64f2 | 7000 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7001 | poll_wait(filp, &md_event_waiters, wait); |
7002 | ||
7003 | /* always allow read */ | |
7004 | mask = POLLIN | POLLRDNORM; | |
7005 | ||
f1514638 | 7006 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7007 | mask |= POLLERR | POLLPRI; |
7008 | return mask; | |
7009 | } | |
7010 | ||
fa027c2a | 7011 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7012 | .owner = THIS_MODULE, |
1da177e4 LT |
7013 | .open = md_seq_open, |
7014 | .read = seq_read, | |
7015 | .llseek = seq_lseek, | |
c3f94b40 | 7016 | .release = seq_release_private, |
d7603b7e | 7017 | .poll = mdstat_poll, |
1da177e4 LT |
7018 | }; |
7019 | ||
84fc4b56 | 7020 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7021 | { |
50bd3774 CY |
7022 | printk(KERN_INFO "md: %s personality registered for level %d\n", |
7023 | p->name, p->level); | |
1da177e4 | 7024 | spin_lock(&pers_lock); |
2604b703 | 7025 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7026 | spin_unlock(&pers_lock); |
7027 | return 0; | |
7028 | } | |
6c144d31 | 7029 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7030 | |
84fc4b56 | 7031 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7032 | { |
2604b703 | 7033 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7034 | spin_lock(&pers_lock); |
2604b703 | 7035 | list_del_init(&p->list); |
1da177e4 LT |
7036 | spin_unlock(&pers_lock); |
7037 | return 0; | |
7038 | } | |
6c144d31 | 7039 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7040 | |
fd01b88c | 7041 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7042 | { |
f72ffdd6 | 7043 | struct md_rdev *rdev; |
1da177e4 | 7044 | int idle; |
eea1bf38 | 7045 | int curr_events; |
1da177e4 LT |
7046 | |
7047 | idle = 1; | |
4b80991c N |
7048 | rcu_read_lock(); |
7049 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7050 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7051 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7052 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7053 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7054 | /* sync IO will cause sync_io to increase before the disk_stats |
7055 | * as sync_io is counted when a request starts, and | |
7056 | * disk_stats is counted when it completes. | |
7057 | * So resync activity will cause curr_events to be smaller than | |
7058 | * when there was no such activity. | |
7059 | * non-sync IO will cause disk_stat to increase without | |
7060 | * increasing sync_io so curr_events will (eventually) | |
7061 | * be larger than it was before. Once it becomes | |
7062 | * substantially larger, the test below will cause | |
7063 | * the array to appear non-idle, and resync will slow | |
7064 | * down. | |
7065 | * If there is a lot of outstanding resync activity when | |
7066 | * we set last_event to curr_events, then all that activity | |
7067 | * completing might cause the array to appear non-idle | |
7068 | * and resync will be slowed down even though there might | |
7069 | * not have been non-resync activity. This will only | |
7070 | * happen once though. 'last_events' will soon reflect | |
7071 | * the state where there is little or no outstanding | |
7072 | * resync requests, and further resync activity will | |
7073 | * always make curr_events less than last_events. | |
c0e48521 | 7074 | * |
1da177e4 | 7075 | */ |
eea1bf38 | 7076 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7077 | rdev->last_events = curr_events; |
7078 | idle = 0; | |
7079 | } | |
7080 | } | |
4b80991c | 7081 | rcu_read_unlock(); |
1da177e4 LT |
7082 | return idle; |
7083 | } | |
7084 | ||
fd01b88c | 7085 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7086 | { |
7087 | /* another "blocks" (512byte) blocks have been synced */ | |
7088 | atomic_sub(blocks, &mddev->recovery_active); | |
7089 | wake_up(&mddev->recovery_wait); | |
7090 | if (!ok) { | |
dfc70645 | 7091 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7092 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7093 | md_wakeup_thread(mddev->thread); |
7094 | // stop recovery, signal do_sync .... | |
7095 | } | |
7096 | } | |
6c144d31 | 7097 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 7098 | |
06d91a5f N |
7099 | /* md_write_start(mddev, bi) |
7100 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7101 | * in superblock) before writing, schedule a superblock update |
7102 | * and wait for it to complete. | |
06d91a5f | 7103 | */ |
fd01b88c | 7104 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7105 | { |
0fd62b86 | 7106 | int did_change = 0; |
06d91a5f | 7107 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7108 | return; |
06d91a5f | 7109 | |
f91de92e N |
7110 | BUG_ON(mddev->ro == 1); |
7111 | if (mddev->ro == 2) { | |
7112 | /* need to switch to read/write */ | |
7113 | mddev->ro = 0; | |
7114 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7115 | md_wakeup_thread(mddev->thread); | |
25156198 | 7116 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7117 | did_change = 1; |
f91de92e | 7118 | } |
06d91a5f | 7119 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7120 | if (mddev->safemode == 1) |
7121 | mddev->safemode = 0; | |
06d91a5f | 7122 | if (mddev->in_sync) { |
85572d7c | 7123 | spin_lock(&mddev->lock); |
3d310eb7 N |
7124 | if (mddev->in_sync) { |
7125 | mddev->in_sync = 0; | |
850b2b42 | 7126 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7127 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7128 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7129 | did_change = 1; |
3d310eb7 | 7130 | } |
85572d7c | 7131 | spin_unlock(&mddev->lock); |
06d91a5f | 7132 | } |
0fd62b86 | 7133 | if (did_change) |
00bcb4ac | 7134 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7135 | wait_event(mddev->sb_wait, |
09a44cc1 | 7136 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 | 7137 | } |
6c144d31 | 7138 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 7139 | |
fd01b88c | 7140 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7141 | { |
7142 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7143 | if (mddev->safemode == 2) | |
7144 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7145 | else if (mddev->safemode_delay) |
1da177e4 LT |
7146 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7147 | } | |
7148 | } | |
6c144d31 | 7149 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 7150 | |
2a2275d6 N |
7151 | /* md_allow_write(mddev) |
7152 | * Calling this ensures that the array is marked 'active' so that writes | |
7153 | * may proceed without blocking. It is important to call this before | |
7154 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7155 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7156 | * |
7157 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7158 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7159 | */ |
fd01b88c | 7160 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7161 | { |
7162 | if (!mddev->pers) | |
b5470dc5 | 7163 | return 0; |
2a2275d6 | 7164 | if (mddev->ro) |
b5470dc5 | 7165 | return 0; |
1a0fd497 | 7166 | if (!mddev->pers->sync_request) |
b5470dc5 | 7167 | return 0; |
2a2275d6 | 7168 | |
85572d7c | 7169 | spin_lock(&mddev->lock); |
2a2275d6 N |
7170 | if (mddev->in_sync) { |
7171 | mddev->in_sync = 0; | |
7172 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7173 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7174 | if (mddev->safemode_delay && |
7175 | mddev->safemode == 0) | |
7176 | mddev->safemode = 1; | |
85572d7c | 7177 | spin_unlock(&mddev->lock); |
2a2275d6 | 7178 | md_update_sb(mddev, 0); |
00bcb4ac | 7179 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 | 7180 | } else |
85572d7c | 7181 | spin_unlock(&mddev->lock); |
b5470dc5 | 7182 | |
070dc6dd | 7183 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7184 | return -EAGAIN; |
7185 | else | |
7186 | return 0; | |
2a2275d6 N |
7187 | } |
7188 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7189 | ||
1da177e4 LT |
7190 | #define SYNC_MARKS 10 |
7191 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7192 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7193 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7194 | { |
4ed8731d | 7195 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7196 | struct mddev *mddev2; |
1da177e4 LT |
7197 | unsigned int currspeed = 0, |
7198 | window; | |
ac7e50a3 | 7199 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 7200 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7201 | unsigned long update_time; |
1da177e4 LT |
7202 | sector_t mark_cnt[SYNC_MARKS]; |
7203 | int last_mark,m; | |
7204 | struct list_head *tmp; | |
7205 | sector_t last_check; | |
57afd89f | 7206 | int skipped = 0; |
3cb03002 | 7207 | struct md_rdev *rdev; |
c4a39551 | 7208 | char *desc, *action = NULL; |
7c2c57c9 | 7209 | struct blk_plug plug; |
1da177e4 LT |
7210 | |
7211 | /* just incase thread restarts... */ | |
7212 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7213 | return; | |
3991b31e N |
7214 | if (mddev->ro) {/* never try to sync a read-only array */ |
7215 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 7216 | return; |
3991b31e | 7217 | } |
1da177e4 | 7218 | |
61df9d91 | 7219 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 7220 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 7221 | desc = "data-check"; |
c4a39551 JB |
7222 | action = "check"; |
7223 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 7224 | desc = "requested-resync"; |
c4a39551 JB |
7225 | action = "repair"; |
7226 | } else | |
61df9d91 N |
7227 | desc = "resync"; |
7228 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7229 | desc = "reshape"; | |
7230 | else | |
7231 | desc = "recovery"; | |
7232 | ||
c4a39551 JB |
7233 | mddev->last_sync_action = action ?: desc; |
7234 | ||
1da177e4 LT |
7235 | /* we overload curr_resync somewhat here. |
7236 | * 0 == not engaged in resync at all | |
7237 | * 2 == checking that there is no conflict with another sync | |
7238 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7239 | * commense | |
7240 | * other == active in resync - this many blocks | |
7241 | * | |
7242 | * Before starting a resync we must have set curr_resync to | |
7243 | * 2, and then checked that every "conflicting" array has curr_resync | |
7244 | * less than ours. When we find one that is the same or higher | |
7245 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7246 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7247 | * This will mean we have to start checking from the beginning again. | |
7248 | * | |
7249 | */ | |
7250 | ||
7251 | do { | |
7252 | mddev->curr_resync = 2; | |
7253 | ||
7254 | try_again: | |
404e4b43 | 7255 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 7256 | goto skip; |
29ac4aa3 | 7257 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7258 | if (mddev2 == mddev) |
7259 | continue; | |
90b08710 BS |
7260 | if (!mddev->parallel_resync |
7261 | && mddev2->curr_resync | |
7262 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7263 | DEFINE_WAIT(wq); |
7264 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7265 | /* arbitrarily yield */ | |
7266 | mddev->curr_resync = 1; | |
7267 | wake_up(&resync_wait); | |
7268 | } | |
7269 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7270 | /* no need to wait here, we can wait the next | |
7271 | * time 'round when curr_resync == 2 | |
7272 | */ | |
7273 | continue; | |
9744197c N |
7274 | /* We need to wait 'interruptible' so as not to |
7275 | * contribute to the load average, and not to | |
7276 | * be caught by 'softlockup' | |
7277 | */ | |
7278 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 7279 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 7280 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7281 | printk(KERN_INFO "md: delaying %s of %s" |
7282 | " until %s has finished (they" | |
1da177e4 | 7283 | " share one or more physical units)\n", |
61df9d91 | 7284 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7285 | mddev_put(mddev2); |
9744197c N |
7286 | if (signal_pending(current)) |
7287 | flush_signals(current); | |
1da177e4 LT |
7288 | schedule(); |
7289 | finish_wait(&resync_wait, &wq); | |
7290 | goto try_again; | |
7291 | } | |
7292 | finish_wait(&resync_wait, &wq); | |
7293 | } | |
7294 | } | |
7295 | } while (mddev->curr_resync < 2); | |
7296 | ||
5fd6c1dc | 7297 | j = 0; |
9d88883e | 7298 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7299 | /* resync follows the size requested by the personality, |
57afd89f | 7300 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7301 | */ |
7302 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7303 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7304 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7305 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7306 | j = mddev->resync_min; | |
7307 | else if (!mddev->bitmap) | |
5fd6c1dc | 7308 | j = mddev->recovery_cp; |
5e96ee65 | 7309 | |
ccfcc3c1 | 7310 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7311 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7312 | else { |
1da177e4 | 7313 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7314 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7315 | j = MaxSector; |
4e59ca7d | 7316 | rcu_read_lock(); |
dafb20fa | 7317 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc N |
7318 | if (rdev->raid_disk >= 0 && |
7319 | !test_bit(Faulty, &rdev->flags) && | |
7320 | !test_bit(In_sync, &rdev->flags) && | |
7321 | rdev->recovery_offset < j) | |
7322 | j = rdev->recovery_offset; | |
4e59ca7d | 7323 | rcu_read_unlock(); |
133d4527 N |
7324 | |
7325 | /* If there is a bitmap, we need to make sure all | |
7326 | * writes that started before we added a spare | |
7327 | * complete before we start doing a recovery. | |
7328 | * Otherwise the write might complete and (via | |
7329 | * bitmap_endwrite) set a bit in the bitmap after the | |
7330 | * recovery has checked that bit and skipped that | |
7331 | * region. | |
7332 | */ | |
7333 | if (mddev->bitmap) { | |
7334 | mddev->pers->quiesce(mddev, 1); | |
7335 | mddev->pers->quiesce(mddev, 0); | |
7336 | } | |
5fd6c1dc | 7337 | } |
1da177e4 | 7338 | |
61df9d91 N |
7339 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7340 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7341 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7342 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7343 | "(but not more than %d KB/sec) for %s.\n", |
7344 | speed_max(mddev), desc); | |
1da177e4 | 7345 | |
eea1bf38 | 7346 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7347 | |
57afd89f | 7348 | io_sectors = 0; |
1da177e4 LT |
7349 | for (m = 0; m < SYNC_MARKS; m++) { |
7350 | mark[m] = jiffies; | |
57afd89f | 7351 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7352 | } |
7353 | last_mark = 0; | |
7354 | mddev->resync_mark = mark[last_mark]; | |
7355 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7356 | ||
7357 | /* | |
7358 | * Tune reconstruction: | |
7359 | */ | |
7360 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7361 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7362 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7363 | |
7364 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7365 | last_check = 0; |
7366 | ||
7367 | if (j>2) { | |
c91abf5a | 7368 | printk(KERN_INFO |
61df9d91 N |
7369 | "md: resuming %s of %s from checkpoint.\n", |
7370 | desc, mdname(mddev)); | |
1da177e4 | 7371 | mddev->curr_resync = j; |
72f36d59 N |
7372 | } else |
7373 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7374 | mddev->curr_resync_completed = j; |
72f36d59 N |
7375 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7376 | md_new_event(mddev); | |
54f89341 | 7377 | update_time = jiffies; |
1da177e4 | 7378 | |
7c2c57c9 | 7379 | blk_start_plug(&plug); |
1da177e4 | 7380 | while (j < max_sectors) { |
57afd89f | 7381 | sector_t sectors; |
1da177e4 | 7382 | |
57afd89f | 7383 | skipped = 0; |
97e4f42d | 7384 | |
7a91ee1f N |
7385 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7386 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7387 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7388 | > (max_sectors >> 4)) || | |
54f89341 | 7389 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f N |
7390 | (j - mddev->curr_resync_completed)*2 |
7391 | >= mddev->resync_max - mddev->curr_resync_completed | |
7392 | )) { | |
97e4f42d | 7393 | /* time to update curr_resync_completed */ |
97e4f42d N |
7394 | wait_event(mddev->recovery_wait, |
7395 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7396 | mddev->curr_resync_completed = j; |
35d78c66 | 7397 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
7398 | j > mddev->recovery_cp) | |
7399 | mddev->recovery_cp = j; | |
54f89341 | 7400 | update_time = jiffies; |
070dc6dd | 7401 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7402 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7403 | } |
acb180b0 | 7404 | |
c91abf5a N |
7405 | while (j >= mddev->resync_max && |
7406 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
7407 | /* As this condition is controlled by user-space, |
7408 | * we can block indefinitely, so use '_interruptible' | |
7409 | * to avoid triggering warnings. | |
7410 | */ | |
7411 | flush_signals(current); /* just in case */ | |
7412 | wait_event_interruptible(mddev->recovery_wait, | |
7413 | mddev->resync_max > j | |
c91abf5a N |
7414 | || test_bit(MD_RECOVERY_INTR, |
7415 | &mddev->recovery)); | |
e62e58a5 | 7416 | } |
acb180b0 | 7417 | |
c91abf5a N |
7418 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7419 | break; | |
acb180b0 | 7420 | |
57afd89f | 7421 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7422 | currspeed < speed_min(mddev)); |
57afd89f | 7423 | if (sectors == 0) { |
dfc70645 | 7424 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 7425 | break; |
1da177e4 | 7426 | } |
57afd89f N |
7427 | |
7428 | if (!skipped) { /* actual IO requested */ | |
7429 | io_sectors += sectors; | |
7430 | atomic_add(sectors, &mddev->recovery_active); | |
7431 | } | |
7432 | ||
e875ecea N |
7433 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7434 | break; | |
7435 | ||
1da177e4 | 7436 | j += sectors; |
72f36d59 N |
7437 | if (j > 2) |
7438 | mddev->curr_resync = j; | |
ff4e8d9a | 7439 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7440 | if (last_check == 0) |
e875ecea | 7441 | /* this is the earliest that rebuild will be |
d7603b7e N |
7442 | * visible in /proc/mdstat |
7443 | */ | |
7444 | md_new_event(mddev); | |
57afd89f N |
7445 | |
7446 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7447 | continue; |
7448 | ||
57afd89f | 7449 | last_check = io_sectors; |
1da177e4 LT |
7450 | repeat: |
7451 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7452 | /* step marks */ | |
7453 | int next = (last_mark+1) % SYNC_MARKS; | |
7454 | ||
7455 | mddev->resync_mark = mark[next]; | |
7456 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7457 | mark[next] = jiffies; | |
57afd89f | 7458 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7459 | last_mark = next; |
7460 | } | |
7461 | ||
c91abf5a N |
7462 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7463 | break; | |
1da177e4 LT |
7464 | |
7465 | /* | |
7466 | * this loop exits only if either when we are slower than | |
7467 | * the 'hard' speed limit, or the system was IO-idle for | |
7468 | * a jiffy. | |
7469 | * the system might be non-idle CPU-wise, but we only care | |
7470 | * about not overloading the IO subsystem. (things like an | |
7471 | * e2fsck being done on the RAID array should execute fast) | |
7472 | */ | |
1da177e4 LT |
7473 | cond_resched(); |
7474 | ||
ac7e50a3 XN |
7475 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
7476 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 7477 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 7478 | |
88202a0c N |
7479 | if (currspeed > speed_min(mddev)) { |
7480 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7481 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7482 | msleep(500); |
1da177e4 LT |
7483 | goto repeat; |
7484 | } | |
7485 | } | |
7486 | } | |
c91abf5a N |
7487 | printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
7488 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
7489 | ? "interrupted" : "done"); | |
1da177e4 LT |
7490 | /* |
7491 | * this also signals 'finished resyncing' to md_stop | |
7492 | */ | |
7c2c57c9 | 7493 | blk_finish_plug(&plug); |
1da177e4 LT |
7494 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7495 | ||
7496 | /* tell personality that we are finished */ | |
57afd89f | 7497 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7498 | |
dfc70645 | 7499 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7500 | mddev->curr_resync > 2) { |
7501 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7502 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7503 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7504 | printk(KERN_INFO | |
61df9d91 N |
7505 | "md: checkpointing %s of %s.\n", |
7506 | desc, mdname(mddev)); | |
0a19caab | 7507 | if (test_bit(MD_RECOVERY_ERROR, |
7508 | &mddev->recovery)) | |
7509 | mddev->recovery_cp = | |
7510 | mddev->curr_resync_completed; | |
7511 | else | |
7512 | mddev->recovery_cp = | |
7513 | mddev->curr_resync; | |
5fd6c1dc N |
7514 | } |
7515 | } else | |
7516 | mddev->recovery_cp = MaxSector; | |
7517 | } else { | |
7518 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7519 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 7520 | rcu_read_lock(); |
dafb20fa | 7521 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7522 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7523 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7524 | !test_bit(Faulty, &rdev->flags) && |
7525 | !test_bit(In_sync, &rdev->flags) && | |
7526 | rdev->recovery_offset < mddev->curr_resync) | |
7527 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7528 | rcu_read_unlock(); |
5fd6c1dc | 7529 | } |
1da177e4 | 7530 | } |
db91ff55 | 7531 | skip: |
17571284 | 7532 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7533 | |
c07b70ad N |
7534 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7535 | /* We completed so min/max setting can be forgotten if used. */ | |
7536 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7537 | mddev->resync_min = 0; | |
7538 | mddev->resync_max = MaxSector; | |
7539 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7540 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7541 | mddev->curr_resync = 0; |
7542 | wake_up(&resync_wait); | |
7543 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7544 | md_wakeup_thread(mddev->thread); | |
c6207277 | 7545 | return; |
1da177e4 | 7546 | } |
29269553 | 7547 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7548 | |
746d3207 N |
7549 | static int remove_and_add_spares(struct mddev *mddev, |
7550 | struct md_rdev *this) | |
b4c4c7b8 | 7551 | { |
3cb03002 | 7552 | struct md_rdev *rdev; |
b4c4c7b8 | 7553 | int spares = 0; |
f2a371c5 | 7554 | int removed = 0; |
b4c4c7b8 | 7555 | |
dafb20fa | 7556 | rdev_for_each(rdev, mddev) |
746d3207 N |
7557 | if ((this == NULL || rdev == this) && |
7558 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 7559 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7560 | (test_bit(Faulty, &rdev->flags) || |
7561 | ! test_bit(In_sync, &rdev->flags)) && | |
7562 | atomic_read(&rdev->nr_pending)==0) { | |
7563 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7564 | mddev, rdev) == 0) { |
36fad858 | 7565 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 7566 | rdev->raid_disk = -1; |
f2a371c5 | 7567 | removed++; |
b4c4c7b8 N |
7568 | } |
7569 | } | |
90584fc9 JB |
7570 | if (removed && mddev->kobj.sd) |
7571 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 7572 | |
746d3207 N |
7573 | if (this) |
7574 | goto no_add; | |
7575 | ||
dafb20fa | 7576 | rdev_for_each(rdev, mddev) { |
7bfec5f3 N |
7577 | if (rdev->raid_disk >= 0 && |
7578 | !test_bit(In_sync, &rdev->flags) && | |
7579 | !test_bit(Faulty, &rdev->flags)) | |
7580 | spares++; | |
7ceb17e8 N |
7581 | if (rdev->raid_disk >= 0) |
7582 | continue; | |
7583 | if (test_bit(Faulty, &rdev->flags)) | |
7584 | continue; | |
7585 | if (mddev->ro && | |
8313b8e5 N |
7586 | ! (rdev->saved_raid_disk >= 0 && |
7587 | !test_bit(Bitmap_sync, &rdev->flags))) | |
7ceb17e8 N |
7588 | continue; |
7589 | ||
7eb41885 N |
7590 | if (rdev->saved_raid_disk < 0) |
7591 | rdev->recovery_offset = 0; | |
7ceb17e8 N |
7592 | if (mddev->pers-> |
7593 | hot_add_disk(mddev, rdev) == 0) { | |
7594 | if (sysfs_link_rdev(mddev, rdev)) | |
7595 | /* failure here is OK */; | |
7596 | spares++; | |
7597 | md_new_event(mddev); | |
7598 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 7599 | } |
b4c4c7b8 | 7600 | } |
746d3207 | 7601 | no_add: |
6dafab6b N |
7602 | if (removed) |
7603 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
7604 | return spares; |
7605 | } | |
7ebc0be7 | 7606 | |
ac05f256 N |
7607 | static void md_start_sync(struct work_struct *ws) |
7608 | { | |
7609 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
7610 | ||
7611 | mddev->sync_thread = md_register_thread(md_do_sync, | |
7612 | mddev, | |
7613 | "resync"); | |
7614 | if (!mddev->sync_thread) { | |
7615 | printk(KERN_ERR "%s: could not start resync" | |
7616 | " thread...\n", | |
7617 | mdname(mddev)); | |
7618 | /* leave the spares where they are, it shouldn't hurt */ | |
7619 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7620 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7621 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7622 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7623 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7624 | wake_up(&resync_wait); |
ac05f256 N |
7625 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
7626 | &mddev->recovery)) | |
7627 | if (mddev->sysfs_action) | |
7628 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7629 | } else | |
7630 | md_wakeup_thread(mddev->sync_thread); | |
7631 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7632 | md_new_event(mddev); | |
7633 | } | |
7634 | ||
1da177e4 LT |
7635 | /* |
7636 | * This routine is regularly called by all per-raid-array threads to | |
7637 | * deal with generic issues like resync and super-block update. | |
7638 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7639 | * need this as they never do any recovery or update the superblock. | |
7640 | * | |
7641 | * It does not do any resync itself, but rather "forks" off other threads | |
7642 | * to do that as needed. | |
7643 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7644 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7645 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7646 | * and wakeups up this thread which will reap the thread and finish up. |
7647 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7648 | * | |
7649 | * The overall approach is: | |
7650 | * 1/ if the superblock needs updating, update it. | |
7651 | * 2/ If a recovery thread is running, don't do anything else. | |
7652 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7653 | * 4/ If there are any faulty devices, remove them. | |
7654 | * 5/ If array is degraded, try to add spares devices | |
7655 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7656 | */ | |
fd01b88c | 7657 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 7658 | { |
68866e42 JB |
7659 | if (mddev->suspended) |
7660 | return; | |
7661 | ||
5f40402d | 7662 | if (mddev->bitmap) |
aa5cbd10 | 7663 | bitmap_daemon_work(mddev); |
1da177e4 | 7664 | |
fca4d848 | 7665 | if (signal_pending(current)) { |
31a59e34 | 7666 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7667 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7668 | mdname(mddev)); | |
7669 | mddev->safemode = 2; | |
7670 | } | |
7671 | flush_signals(current); | |
7672 | } | |
7673 | ||
c89a8eee N |
7674 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7675 | return; | |
1da177e4 | 7676 | if ( ! ( |
142d44c3 | 7677 | (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7678 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7679 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7680 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7681 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7682 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7683 | )) |
7684 | return; | |
fca4d848 | 7685 | |
df5b89b3 | 7686 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7687 | int spares = 0; |
fca4d848 | 7688 | |
c89a8eee | 7689 | if (mddev->ro) { |
7ceb17e8 N |
7690 | /* On a read-only array we can: |
7691 | * - remove failed devices | |
7692 | * - add already-in_sync devices if the array itself | |
7693 | * is in-sync. | |
7694 | * As we only add devices that are already in-sync, | |
7695 | * we can activate the spares immediately. | |
c89a8eee | 7696 | */ |
7ceb17e8 | 7697 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
7698 | /* There is no thread, but we need to call |
7699 | * ->spare_active and clear saved_raid_disk | |
7700 | */ | |
2ac295a5 | 7701 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 N |
7702 | md_reap_sync_thread(mddev); |
7703 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
c89a8eee N |
7704 | goto unlock; |
7705 | } | |
7706 | ||
31a59e34 | 7707 | if (!mddev->external) { |
0fd62b86 | 7708 | int did_change = 0; |
85572d7c | 7709 | spin_lock(&mddev->lock); |
31a59e34 N |
7710 | if (mddev->safemode && |
7711 | !atomic_read(&mddev->writes_pending) && | |
7712 | !mddev->in_sync && | |
7713 | mddev->recovery_cp == MaxSector) { | |
7714 | mddev->in_sync = 1; | |
0fd62b86 | 7715 | did_change = 1; |
070dc6dd | 7716 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7717 | } |
7718 | if (mddev->safemode == 1) | |
7719 | mddev->safemode = 0; | |
85572d7c | 7720 | spin_unlock(&mddev->lock); |
0fd62b86 | 7721 | if (did_change) |
00bcb4ac | 7722 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7723 | } |
fca4d848 | 7724 | |
7a0a5355 | 7725 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 7726 | md_update_sb(mddev, 0); |
06d91a5f | 7727 | |
1da177e4 LT |
7728 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7729 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7730 | /* resync/recovery still happening */ | |
7731 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7732 | goto unlock; | |
7733 | } | |
7734 | if (mddev->sync_thread) { | |
a91d5ac0 | 7735 | md_reap_sync_thread(mddev); |
1da177e4 LT |
7736 | goto unlock; |
7737 | } | |
72a23c21 NB |
7738 | /* Set RUNNING before clearing NEEDED to avoid |
7739 | * any transients in the value of "sync_action". | |
7740 | */ | |
72f36d59 | 7741 | mddev->curr_resync_completed = 0; |
72a23c21 | 7742 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
24dd469d N |
7743 | /* Clear some bits that don't mean anything, but |
7744 | * might be left set | |
7745 | */ | |
24dd469d N |
7746 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7747 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7748 | |
ed209584 N |
7749 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
7750 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 7751 | goto not_running; |
1da177e4 LT |
7752 | /* no recovery is running. |
7753 | * remove any failed drives, then | |
7754 | * add spares if possible. | |
72f36d59 | 7755 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
7756 | * the personality to fail the re-add. |
7757 | */ | |
1da177e4 | 7758 | |
b4c4c7b8 | 7759 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7760 | if (mddev->pers->check_reshape == NULL || |
7761 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 7762 | /* Cannot proceed */ |
ac05f256 | 7763 | goto not_running; |
b4c4c7b8 | 7764 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 7765 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 7766 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
7767 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7768 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7769 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7770 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7771 | } else if (mddev->recovery_cp < MaxSector) { |
7772 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7773 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7774 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7775 | /* nothing to be done ... */ | |
ac05f256 | 7776 | goto not_running; |
24dd469d | 7777 | |
1da177e4 | 7778 | if (mddev->pers->sync_request) { |
ef99bf48 | 7779 | if (spares) { |
a654b9d8 N |
7780 | /* We are adding a device or devices to an array |
7781 | * which has the bitmap stored on all devices. | |
7782 | * So make sure all bitmap pages get written | |
7783 | */ | |
7784 | bitmap_write_all(mddev->bitmap); | |
7785 | } | |
ac05f256 N |
7786 | INIT_WORK(&mddev->del_work, md_start_sync); |
7787 | queue_work(md_misc_wq, &mddev->del_work); | |
7788 | goto unlock; | |
1da177e4 | 7789 | } |
ac05f256 | 7790 | not_running: |
72a23c21 NB |
7791 | if (!mddev->sync_thread) { |
7792 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7793 | wake_up(&resync_wait); |
72a23c21 NB |
7794 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
7795 | &mddev->recovery)) | |
0c3573f1 | 7796 | if (mddev->sysfs_action) |
00bcb4ac | 7797 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7798 | } |
ac05f256 N |
7799 | unlock: |
7800 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
7801 | mddev_unlock(mddev); |
7802 | } | |
7803 | } | |
6c144d31 | 7804 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 7805 | |
a91d5ac0 JB |
7806 | void md_reap_sync_thread(struct mddev *mddev) |
7807 | { | |
7808 | struct md_rdev *rdev; | |
7809 | ||
7810 | /* resync has finished, collect result */ | |
7811 | md_unregister_thread(&mddev->sync_thread); | |
7812 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7813 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7814 | /* success...*/ | |
7815 | /* activate any spares */ | |
7816 | if (mddev->pers->spare_active(mddev)) { | |
7817 | sysfs_notify(&mddev->kobj, NULL, | |
7818 | "degraded"); | |
7819 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
7820 | } | |
7821 | } | |
7822 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7823 | mddev->pers->finish_reshape) | |
7824 | mddev->pers->finish_reshape(mddev); | |
7825 | ||
7826 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 7827 | * information must be scrapped. |
a91d5ac0 | 7828 | */ |
f466722c N |
7829 | if (!mddev->degraded) |
7830 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
7831 | rdev->saved_raid_disk = -1; |
7832 | ||
7833 | md_update_sb(mddev, 1); | |
7834 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7835 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7836 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7837 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7838 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 7839 | wake_up(&resync_wait); |
a91d5ac0 JB |
7840 | /* flag recovery needed just to double check */ |
7841 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7842 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7843 | md_new_event(mddev); | |
7844 | if (mddev->event_work.func) | |
7845 | queue_work(md_misc_wq, &mddev->event_work); | |
7846 | } | |
6c144d31 | 7847 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 7848 | |
fd01b88c | 7849 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 7850 | { |
00bcb4ac | 7851 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 7852 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
7853 | !test_bit(Blocked, &rdev->flags) && |
7854 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
7855 | msecs_to_jiffies(5000)); |
7856 | rdev_dec_pending(rdev, mddev); | |
7857 | } | |
7858 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7859 | ||
c6563a8c N |
7860 | void md_finish_reshape(struct mddev *mddev) |
7861 | { | |
7862 | /* called be personality module when reshape completes. */ | |
7863 | struct md_rdev *rdev; | |
7864 | ||
7865 | rdev_for_each(rdev, mddev) { | |
7866 | if (rdev->data_offset > rdev->new_data_offset) | |
7867 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
7868 | else | |
7869 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
7870 | rdev->data_offset = rdev->new_data_offset; | |
7871 | } | |
7872 | } | |
7873 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
7874 | |
7875 | /* Bad block management. | |
7876 | * We can record which blocks on each device are 'bad' and so just | |
7877 | * fail those blocks, or that stripe, rather than the whole device. | |
7878 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7879 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7880 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7881 | * A 'shift' can be set so that larger blocks are tracked and | |
7882 | * consequently larger devices can be covered. | |
7883 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7884 | * | |
7885 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7886 | * might need to retry if it is very unlucky. | |
7887 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7888 | * so we use the write_seqlock_irq variant. | |
7889 | * | |
7890 | * When looking for a bad block we specify a range and want to | |
7891 | * know if any block in the range is bad. So we binary-search | |
7892 | * to the last range that starts at-or-before the given endpoint, | |
7893 | * (or "before the sector after the target range") | |
7894 | * then see if it ends after the given start. | |
7895 | * We return | |
7896 | * 0 if there are no known bad blocks in the range | |
7897 | * 1 if there are known bad block which are all acknowledged | |
7898 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
7899 | * plus the start/length of the first bad section we overlap. | |
7900 | */ | |
7901 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
7902 | sector_t *first_bad, int *bad_sectors) | |
7903 | { | |
7904 | int hi; | |
ab05613a | 7905 | int lo; |
2230dfe4 | 7906 | u64 *p = bb->page; |
ab05613a | 7907 | int rv; |
2230dfe4 N |
7908 | sector_t target = s + sectors; |
7909 | unsigned seq; | |
7910 | ||
7911 | if (bb->shift > 0) { | |
7912 | /* round the start down, and the end up */ | |
7913 | s >>= bb->shift; | |
7914 | target += (1<<bb->shift) - 1; | |
7915 | target >>= bb->shift; | |
7916 | sectors = target - s; | |
7917 | } | |
7918 | /* 'target' is now the first block after the bad range */ | |
7919 | ||
7920 | retry: | |
7921 | seq = read_seqbegin(&bb->lock); | |
ab05613a | 7922 | lo = 0; |
7923 | rv = 0; | |
2230dfe4 N |
7924 | hi = bb->count; |
7925 | ||
7926 | /* Binary search between lo and hi for 'target' | |
7927 | * i.e. for the last range that starts before 'target' | |
7928 | */ | |
7929 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
7930 | * are known not to be the last range before target. | |
7931 | * VARIANT: hi-lo is the number of possible | |
7932 | * ranges, and decreases until it reaches 1 | |
7933 | */ | |
7934 | while (hi - lo > 1) { | |
7935 | int mid = (lo + hi) / 2; | |
7936 | sector_t a = BB_OFFSET(p[mid]); | |
7937 | if (a < target) | |
7938 | /* This could still be the one, earlier ranges | |
7939 | * could not. */ | |
7940 | lo = mid; | |
7941 | else | |
7942 | /* This and later ranges are definitely out. */ | |
7943 | hi = mid; | |
7944 | } | |
7945 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
7946 | if (hi > lo) { | |
7947 | /* need to check all range that end after 's' to see if | |
7948 | * any are unacknowledged. | |
7949 | */ | |
7950 | while (lo >= 0 && | |
7951 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7952 | if (BB_OFFSET(p[lo]) < target) { | |
7953 | /* starts before the end, and finishes after | |
7954 | * the start, so they must overlap | |
7955 | */ | |
7956 | if (rv != -1 && BB_ACK(p[lo])) | |
7957 | rv = 1; | |
7958 | else | |
7959 | rv = -1; | |
7960 | *first_bad = BB_OFFSET(p[lo]); | |
7961 | *bad_sectors = BB_LEN(p[lo]); | |
7962 | } | |
7963 | lo--; | |
7964 | } | |
7965 | } | |
7966 | ||
7967 | if (read_seqretry(&bb->lock, seq)) | |
7968 | goto retry; | |
7969 | ||
7970 | return rv; | |
7971 | } | |
7972 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
7973 | ||
7974 | /* | |
7975 | * Add a range of bad blocks to the table. | |
7976 | * This might extend the table, or might contract it | |
7977 | * if two adjacent ranges can be merged. | |
7978 | * We binary-search to find the 'insertion' point, then | |
7979 | * decide how best to handle it. | |
7980 | */ | |
7981 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
7982 | int acknowledged) | |
7983 | { | |
7984 | u64 *p; | |
7985 | int lo, hi; | |
7986 | int rv = 1; | |
905b0297 | 7987 | unsigned long flags; |
2230dfe4 N |
7988 | |
7989 | if (bb->shift < 0) | |
7990 | /* badblocks are disabled */ | |
7991 | return 0; | |
7992 | ||
7993 | if (bb->shift) { | |
7994 | /* round the start down, and the end up */ | |
7995 | sector_t next = s + sectors; | |
7996 | s >>= bb->shift; | |
7997 | next += (1<<bb->shift) - 1; | |
7998 | next >>= bb->shift; | |
7999 | sectors = next - s; | |
8000 | } | |
8001 | ||
905b0297 | 8002 | write_seqlock_irqsave(&bb->lock, flags); |
2230dfe4 N |
8003 | |
8004 | p = bb->page; | |
8005 | lo = 0; | |
8006 | hi = bb->count; | |
8007 | /* Find the last range that starts at-or-before 's' */ | |
8008 | while (hi - lo > 1) { | |
8009 | int mid = (lo + hi) / 2; | |
8010 | sector_t a = BB_OFFSET(p[mid]); | |
8011 | if (a <= s) | |
8012 | lo = mid; | |
8013 | else | |
8014 | hi = mid; | |
8015 | } | |
8016 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8017 | hi = lo; | |
8018 | ||
8019 | if (hi > lo) { | |
8020 | /* we found a range that might merge with the start | |
8021 | * of our new range | |
8022 | */ | |
8023 | sector_t a = BB_OFFSET(p[lo]); | |
8024 | sector_t e = a + BB_LEN(p[lo]); | |
8025 | int ack = BB_ACK(p[lo]); | |
8026 | if (e >= s) { | |
8027 | /* Yes, we can merge with a previous range */ | |
8028 | if (s == a && s + sectors >= e) | |
8029 | /* new range covers old */ | |
8030 | ack = acknowledged; | |
8031 | else | |
8032 | ack = ack && acknowledged; | |
8033 | ||
8034 | if (e < s + sectors) | |
8035 | e = s + sectors; | |
8036 | if (e - a <= BB_MAX_LEN) { | |
8037 | p[lo] = BB_MAKE(a, e-a, ack); | |
8038 | s = e; | |
8039 | } else { | |
8040 | /* does not all fit in one range, | |
8041 | * make p[lo] maximal | |
8042 | */ | |
8043 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8044 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8045 | s = a + BB_MAX_LEN; | |
8046 | } | |
8047 | sectors = e - s; | |
8048 | } | |
8049 | } | |
8050 | if (sectors && hi < bb->count) { | |
8051 | /* 'hi' points to the first range that starts after 's'. | |
8052 | * Maybe we can merge with the start of that range */ | |
8053 | sector_t a = BB_OFFSET(p[hi]); | |
8054 | sector_t e = a + BB_LEN(p[hi]); | |
8055 | int ack = BB_ACK(p[hi]); | |
8056 | if (a <= s + sectors) { | |
8057 | /* merging is possible */ | |
8058 | if (e <= s + sectors) { | |
8059 | /* full overlap */ | |
8060 | e = s + sectors; | |
8061 | ack = acknowledged; | |
8062 | } else | |
8063 | ack = ack && acknowledged; | |
8064 | ||
8065 | a = s; | |
8066 | if (e - a <= BB_MAX_LEN) { | |
8067 | p[hi] = BB_MAKE(a, e-a, ack); | |
8068 | s = e; | |
8069 | } else { | |
8070 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8071 | s = a + BB_MAX_LEN; | |
8072 | } | |
8073 | sectors = e - s; | |
8074 | lo = hi; | |
8075 | hi++; | |
8076 | } | |
8077 | } | |
8078 | if (sectors == 0 && hi < bb->count) { | |
8079 | /* we might be able to combine lo and hi */ | |
8080 | /* Note: 's' is at the end of 'lo' */ | |
8081 | sector_t a = BB_OFFSET(p[hi]); | |
8082 | int lolen = BB_LEN(p[lo]); | |
8083 | int hilen = BB_LEN(p[hi]); | |
8084 | int newlen = lolen + hilen - (s - a); | |
8085 | if (s >= a && newlen < BB_MAX_LEN) { | |
8086 | /* yes, we can combine them */ | |
8087 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8088 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8089 | memmove(p + hi, p + hi + 1, | |
8090 | (bb->count - hi - 1) * 8); | |
8091 | bb->count--; | |
8092 | } | |
8093 | } | |
8094 | while (sectors) { | |
8095 | /* didn't merge (it all). | |
8096 | * Need to add a range just before 'hi' */ | |
8097 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8098 | /* No room for more */ | |
8099 | rv = 0; | |
8100 | break; | |
8101 | } else { | |
8102 | int this_sectors = sectors; | |
8103 | memmove(p + hi + 1, p + hi, | |
8104 | (bb->count - hi) * 8); | |
8105 | bb->count++; | |
8106 | ||
8107 | if (this_sectors > BB_MAX_LEN) | |
8108 | this_sectors = BB_MAX_LEN; | |
8109 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8110 | sectors -= this_sectors; | |
8111 | s += this_sectors; | |
8112 | } | |
8113 | } | |
8114 | ||
8115 | bb->changed = 1; | |
de393cde N |
8116 | if (!acknowledged) |
8117 | bb->unacked_exist = 1; | |
905b0297 | 8118 | write_sequnlock_irqrestore(&bb->lock, flags); |
2230dfe4 N |
8119 | |
8120 | return rv; | |
8121 | } | |
8122 | ||
3cb03002 | 8123 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8124 | int is_new) |
2230dfe4 | 8125 | { |
c6563a8c N |
8126 | int rv; |
8127 | if (is_new) | |
8128 | s += rdev->new_data_offset; | |
8129 | else | |
8130 | s += rdev->data_offset; | |
8131 | rv = md_set_badblocks(&rdev->badblocks, | |
8132 | s, sectors, 0); | |
2230dfe4 N |
8133 | if (rv) { |
8134 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8135 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 N |
8136 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
8137 | md_wakeup_thread(rdev->mddev->thread); | |
8138 | } | |
8139 | return rv; | |
8140 | } | |
8141 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8142 | ||
8143 | /* | |
8144 | * Remove a range of bad blocks from the table. | |
8145 | * This may involve extending the table if we spilt a region, | |
8146 | * but it must not fail. So if the table becomes full, we just | |
8147 | * drop the remove request. | |
8148 | */ | |
8149 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8150 | { | |
8151 | u64 *p; | |
8152 | int lo, hi; | |
8153 | sector_t target = s + sectors; | |
8154 | int rv = 0; | |
8155 | ||
8156 | if (bb->shift > 0) { | |
8157 | /* When clearing we round the start up and the end down. | |
8158 | * This should not matter as the shift should align with | |
8159 | * the block size and no rounding should ever be needed. | |
8160 | * However it is better the think a block is bad when it | |
8161 | * isn't than to think a block is not bad when it is. | |
8162 | */ | |
8163 | s += (1<<bb->shift) - 1; | |
8164 | s >>= bb->shift; | |
8165 | target >>= bb->shift; | |
8166 | sectors = target - s; | |
8167 | } | |
8168 | ||
8169 | write_seqlock_irq(&bb->lock); | |
8170 | ||
8171 | p = bb->page; | |
8172 | lo = 0; | |
8173 | hi = bb->count; | |
8174 | /* Find the last range that starts before 'target' */ | |
8175 | while (hi - lo > 1) { | |
8176 | int mid = (lo + hi) / 2; | |
8177 | sector_t a = BB_OFFSET(p[mid]); | |
8178 | if (a < target) | |
8179 | lo = mid; | |
8180 | else | |
8181 | hi = mid; | |
8182 | } | |
8183 | if (hi > lo) { | |
8184 | /* p[lo] is the last range that could overlap the | |
8185 | * current range. Earlier ranges could also overlap, | |
8186 | * but only this one can overlap the end of the range. | |
8187 | */ | |
8188 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8189 | /* Partial overlap, leave the tail of this range */ | |
8190 | int ack = BB_ACK(p[lo]); | |
8191 | sector_t a = BB_OFFSET(p[lo]); | |
8192 | sector_t end = a + BB_LEN(p[lo]); | |
8193 | ||
8194 | if (a < s) { | |
8195 | /* we need to split this range */ | |
8196 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8b32bf5e | 8197 | rv = -ENOSPC; |
2230dfe4 N |
8198 | goto out; |
8199 | } | |
8200 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8201 | bb->count++; | |
8202 | p[lo] = BB_MAKE(a, s-a, ack); | |
8203 | lo++; | |
8204 | } | |
8205 | p[lo] = BB_MAKE(target, end - target, ack); | |
8206 | /* there is no longer an overlap */ | |
8207 | hi = lo; | |
8208 | lo--; | |
8209 | } | |
8210 | while (lo >= 0 && | |
8211 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8212 | /* This range does overlap */ | |
8213 | if (BB_OFFSET(p[lo]) < s) { | |
8214 | /* Keep the early parts of this range. */ | |
8215 | int ack = BB_ACK(p[lo]); | |
8216 | sector_t start = BB_OFFSET(p[lo]); | |
8217 | p[lo] = BB_MAKE(start, s - start, ack); | |
8218 | /* now low doesn't overlap, so.. */ | |
8219 | break; | |
8220 | } | |
8221 | lo--; | |
8222 | } | |
8223 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8224 | * anything between needs to be discarded | |
8225 | */ | |
8226 | if (hi - lo > 1) { | |
8227 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8228 | bb->count -= (hi - lo - 1); | |
8229 | } | |
8230 | } | |
8231 | ||
8232 | bb->changed = 1; | |
8233 | out: | |
8234 | write_sequnlock_irq(&bb->lock); | |
8235 | return rv; | |
8236 | } | |
8237 | ||
c6563a8c N |
8238 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8239 | int is_new) | |
2230dfe4 | 8240 | { |
c6563a8c N |
8241 | if (is_new) |
8242 | s += rdev->new_data_offset; | |
8243 | else | |
8244 | s += rdev->data_offset; | |
2230dfe4 | 8245 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8246 | s, sectors); |
2230dfe4 N |
8247 | } |
8248 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8249 | ||
8250 | /* | |
8251 | * Acknowledge all bad blocks in a list. | |
8252 | * This only succeeds if ->changed is clear. It is used by | |
8253 | * in-kernel metadata updates | |
8254 | */ | |
8255 | void md_ack_all_badblocks(struct badblocks *bb) | |
8256 | { | |
8257 | if (bb->page == NULL || bb->changed) | |
8258 | /* no point even trying */ | |
8259 | return; | |
8260 | write_seqlock_irq(&bb->lock); | |
8261 | ||
ecb178bb | 8262 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8263 | u64 *p = bb->page; |
8264 | int i; | |
8265 | for (i = 0; i < bb->count ; i++) { | |
8266 | if (!BB_ACK(p[i])) { | |
8267 | sector_t start = BB_OFFSET(p[i]); | |
8268 | int len = BB_LEN(p[i]); | |
8269 | p[i] = BB_MAKE(start, len, 1); | |
8270 | } | |
8271 | } | |
de393cde | 8272 | bb->unacked_exist = 0; |
2230dfe4 N |
8273 | } |
8274 | write_sequnlock_irq(&bb->lock); | |
8275 | } | |
8276 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8277 | ||
16c791a5 N |
8278 | /* sysfs access to bad-blocks list. |
8279 | * We present two files. | |
8280 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8281 | * are recorded as bad. The list is truncated to fit within | |
8282 | * the one-page limit of sysfs. | |
8283 | * Writing "sector length" to this file adds an acknowledged | |
8284 | * bad block list. | |
8285 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8286 | * been acknowledged. Writing to this file adds bad blocks | |
8287 | * without acknowledging them. This is largely for testing. | |
8288 | */ | |
8289 | ||
8290 | static ssize_t | |
8291 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8292 | { | |
8293 | size_t len; | |
8294 | int i; | |
8295 | u64 *p = bb->page; | |
8296 | unsigned seq; | |
8297 | ||
8298 | if (bb->shift < 0) | |
8299 | return 0; | |
8300 | ||
8301 | retry: | |
8302 | seq = read_seqbegin(&bb->lock); | |
8303 | ||
8304 | len = 0; | |
8305 | i = 0; | |
8306 | ||
8307 | while (len < PAGE_SIZE && i < bb->count) { | |
8308 | sector_t s = BB_OFFSET(p[i]); | |
8309 | unsigned int length = BB_LEN(p[i]); | |
8310 | int ack = BB_ACK(p[i]); | |
8311 | i++; | |
8312 | ||
8313 | if (unack && ack) | |
8314 | continue; | |
8315 | ||
8316 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8317 | (unsigned long long)s << bb->shift, | |
8318 | length << bb->shift); | |
8319 | } | |
de393cde N |
8320 | if (unack && len == 0) |
8321 | bb->unacked_exist = 0; | |
16c791a5 N |
8322 | |
8323 | if (read_seqretry(&bb->lock, seq)) | |
8324 | goto retry; | |
8325 | ||
8326 | return len; | |
8327 | } | |
8328 | ||
8329 | #define DO_DEBUG 1 | |
8330 | ||
8331 | static ssize_t | |
8332 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8333 | { | |
8334 | unsigned long long sector; | |
8335 | int length; | |
8336 | char newline; | |
8337 | #ifdef DO_DEBUG | |
8338 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8339 | * Normally only a successful write may clear a badblock | |
8340 | */ | |
8341 | int clear = 0; | |
8342 | if (page[0] == '-') { | |
8343 | clear = 1; | |
8344 | page++; | |
8345 | } | |
8346 | #endif /* DO_DEBUG */ | |
8347 | ||
8348 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8349 | case 3: | |
8350 | if (newline != '\n') | |
8351 | return -EINVAL; | |
8352 | case 2: | |
8353 | if (length <= 0) | |
8354 | return -EINVAL; | |
8355 | break; | |
8356 | default: | |
8357 | return -EINVAL; | |
8358 | } | |
8359 | ||
8360 | #ifdef DO_DEBUG | |
8361 | if (clear) { | |
8362 | md_clear_badblocks(bb, sector, length); | |
8363 | return len; | |
8364 | } | |
8365 | #endif /* DO_DEBUG */ | |
8366 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8367 | return len; | |
8368 | else | |
8369 | return -ENOSPC; | |
8370 | } | |
8371 | ||
75c96f85 AB |
8372 | static int md_notify_reboot(struct notifier_block *this, |
8373 | unsigned long code, void *x) | |
1da177e4 LT |
8374 | { |
8375 | struct list_head *tmp; | |
fd01b88c | 8376 | struct mddev *mddev; |
2dba6a91 | 8377 | int need_delay = 0; |
1da177e4 | 8378 | |
c744a65c N |
8379 | for_each_mddev(mddev, tmp) { |
8380 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8381 | if (mddev->pers) |
8382 | __md_stop_writes(mddev); | |
0f62fb22 N |
8383 | if (mddev->persistent) |
8384 | mddev->safemode = 2; | |
c744a65c | 8385 | mddev_unlock(mddev); |
2dba6a91 | 8386 | } |
c744a65c | 8387 | need_delay = 1; |
1da177e4 | 8388 | } |
c744a65c N |
8389 | /* |
8390 | * certain more exotic SCSI devices are known to be | |
8391 | * volatile wrt too early system reboots. While the | |
8392 | * right place to handle this issue is the given | |
8393 | * driver, we do want to have a safe RAID driver ... | |
8394 | */ | |
8395 | if (need_delay) | |
8396 | mdelay(1000*1); | |
8397 | ||
1da177e4 LT |
8398 | return NOTIFY_DONE; |
8399 | } | |
8400 | ||
75c96f85 | 8401 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8402 | .notifier_call = md_notify_reboot, |
8403 | .next = NULL, | |
8404 | .priority = INT_MAX, /* before any real devices */ | |
8405 | }; | |
8406 | ||
8407 | static void md_geninit(void) | |
8408 | { | |
36a4e1fe | 8409 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8410 | |
c7705f34 | 8411 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8412 | } |
8413 | ||
75c96f85 | 8414 | static int __init md_init(void) |
1da177e4 | 8415 | { |
e804ac78 TH |
8416 | int ret = -ENOMEM; |
8417 | ||
ada609ee | 8418 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8419 | if (!md_wq) |
8420 | goto err_wq; | |
8421 | ||
8422 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8423 | if (!md_misc_wq) | |
8424 | goto err_misc_wq; | |
8425 | ||
8426 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8427 | goto err_md; | |
8428 | ||
8429 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8430 | goto err_mdp; | |
8431 | mdp_major = ret; | |
8432 | ||
af5628f0 | 8433 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
8434 | md_probe, NULL, NULL); |
8435 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8436 | md_probe, NULL, NULL); |
8437 | ||
1da177e4 | 8438 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8439 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8440 | |
8441 | md_geninit(); | |
d710e138 | 8442 | return 0; |
1da177e4 | 8443 | |
e804ac78 TH |
8444 | err_mdp: |
8445 | unregister_blkdev(MD_MAJOR, "md"); | |
8446 | err_md: | |
8447 | destroy_workqueue(md_misc_wq); | |
8448 | err_misc_wq: | |
8449 | destroy_workqueue(md_wq); | |
8450 | err_wq: | |
8451 | return ret; | |
8452 | } | |
1da177e4 LT |
8453 | |
8454 | #ifndef MODULE | |
8455 | ||
8456 | /* | |
8457 | * Searches all registered partitions for autorun RAID arrays | |
8458 | * at boot time. | |
8459 | */ | |
4d936ec1 ME |
8460 | |
8461 | static LIST_HEAD(all_detected_devices); | |
8462 | struct detected_devices_node { | |
8463 | struct list_head list; | |
8464 | dev_t dev; | |
8465 | }; | |
1da177e4 LT |
8466 | |
8467 | void md_autodetect_dev(dev_t dev) | |
8468 | { | |
4d936ec1 ME |
8469 | struct detected_devices_node *node_detected_dev; |
8470 | ||
8471 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8472 | if (node_detected_dev) { | |
8473 | node_detected_dev->dev = dev; | |
8474 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8475 | } else { | |
8476 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8477 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8478 | } | |
1da177e4 LT |
8479 | } |
8480 | ||
1da177e4 LT |
8481 | static void autostart_arrays(int part) |
8482 | { | |
3cb03002 | 8483 | struct md_rdev *rdev; |
4d936ec1 ME |
8484 | struct detected_devices_node *node_detected_dev; |
8485 | dev_t dev; | |
8486 | int i_scanned, i_passed; | |
1da177e4 | 8487 | |
4d936ec1 ME |
8488 | i_scanned = 0; |
8489 | i_passed = 0; | |
1da177e4 | 8490 | |
4d936ec1 | 8491 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8492 | |
4d936ec1 ME |
8493 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8494 | i_scanned++; | |
8495 | node_detected_dev = list_entry(all_detected_devices.next, | |
8496 | struct detected_devices_node, list); | |
8497 | list_del(&node_detected_dev->list); | |
8498 | dev = node_detected_dev->dev; | |
8499 | kfree(node_detected_dev); | |
df968c4e | 8500 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8501 | if (IS_ERR(rdev)) |
8502 | continue; | |
8503 | ||
403df478 | 8504 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 8505 | continue; |
403df478 | 8506 | |
d0fae18f | 8507 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8508 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8509 | i_passed++; |
1da177e4 | 8510 | } |
4d936ec1 ME |
8511 | |
8512 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8513 | i_scanned, i_passed); | |
1da177e4 LT |
8514 | |
8515 | autorun_devices(part); | |
8516 | } | |
8517 | ||
fdee8ae4 | 8518 | #endif /* !MODULE */ |
1da177e4 LT |
8519 | |
8520 | static __exit void md_exit(void) | |
8521 | { | |
fd01b88c | 8522 | struct mddev *mddev; |
1da177e4 | 8523 | struct list_head *tmp; |
e2f23b60 | 8524 | int delay = 1; |
8ab5e4c1 | 8525 | |
af5628f0 | 8526 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 8527 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8528 | |
3dbd8c2e | 8529 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8530 | unregister_blkdev(mdp_major, "mdp"); |
8531 | unregister_reboot_notifier(&md_notifier); | |
8532 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
8533 | |
8534 | /* We cannot unload the modules while some process is | |
8535 | * waiting for us in select() or poll() - wake them up | |
8536 | */ | |
8537 | md_unloading = 1; | |
8538 | while (waitqueue_active(&md_event_waiters)) { | |
8539 | /* not safe to leave yet */ | |
8540 | wake_up(&md_event_waiters); | |
8541 | msleep(delay); | |
8542 | delay += delay; | |
8543 | } | |
1da177e4 | 8544 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 8545 | |
29ac4aa3 | 8546 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8547 | export_array(mddev); |
d3374825 | 8548 | mddev->hold_active = 0; |
1da177e4 | 8549 | } |
e804ac78 TH |
8550 | destroy_workqueue(md_misc_wq); |
8551 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8552 | } |
8553 | ||
685784aa | 8554 | subsys_initcall(md_init); |
1da177e4 LT |
8555 | module_exit(md_exit) |
8556 | ||
f91de92e N |
8557 | static int get_ro(char *buffer, struct kernel_param *kp) |
8558 | { | |
8559 | return sprintf(buffer, "%d", start_readonly); | |
8560 | } | |
8561 | static int set_ro(const char *val, struct kernel_param *kp) | |
8562 | { | |
8563 | char *e; | |
8564 | int num = simple_strtoul(val, &e, 10); | |
8565 | if (*val && (*e == '\0' || *e == '\n')) { | |
8566 | start_readonly = num; | |
4dbcdc75 | 8567 | return 0; |
f91de92e N |
8568 | } |
8569 | return -EINVAL; | |
8570 | } | |
8571 | ||
80ca3a44 N |
8572 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8573 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 8574 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8575 | |
1da177e4 | 8576 | MODULE_LICENSE("GPL"); |
0efb9e61 | 8577 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8578 | MODULE_ALIAS("md"); |
72008652 | 8579 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |