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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
f72ffdd6 | 3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar |
1da177e4 LT |
4 | |
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
ff01bb48 | 39 | #include <linux/fs.h> |
d7603b7e | 40 | #include <linux/poll.h> |
16f17b39 | 41 | #include <linux/ctype.h> |
e7d2860b | 42 | #include <linux/string.h> |
fb4d8c76 N |
43 | #include <linux/hdreg.h> |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/random.h> | |
056075c7 | 46 | #include <linux/module.h> |
fb4d8c76 | 47 | #include <linux/reboot.h> |
32a7627c | 48 | #include <linux/file.h> |
aa98aa31 | 49 | #include <linux/compat.h> |
25570727 | 50 | #include <linux/delay.h> |
bff61975 N |
51 | #include <linux/raid/md_p.h> |
52 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
43b2e5d8 | 54 | #include "md.h" |
ef740c37 | 55 | #include "bitmap.h" |
1da177e4 | 56 | |
1da177e4 | 57 | #ifndef MODULE |
d710e138 | 58 | static void autostart_arrays(int part); |
1da177e4 LT |
59 | #endif |
60 | ||
01f96c0a N |
61 | /* pers_list is a list of registered personalities protected |
62 | * by pers_lock. | |
63 | * pers_lock does extra service to protect accesses to | |
64 | * mddev->thread when the mutex cannot be held. | |
65 | */ | |
2604b703 | 66 | static LIST_HEAD(pers_list); |
1da177e4 LT |
67 | static DEFINE_SPINLOCK(pers_lock); |
68 | ||
90b08710 | 69 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
70 | static struct workqueue_struct *md_wq; |
71 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 72 | |
746d3207 N |
73 | static int remove_and_add_spares(struct mddev *mddev, |
74 | struct md_rdev *this); | |
5aa61f42 | 75 | static void mddev_detach(struct mddev *mddev); |
746d3207 | 76 | |
1e50915f RB |
77 | /* |
78 | * Default number of read corrections we'll attempt on an rdev | |
79 | * before ejecting it from the array. We divide the read error | |
80 | * count by 2 for every hour elapsed between read errors. | |
81 | */ | |
82 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
83 | /* |
84 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
85 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
86 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 87 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
88 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
89 | * speed limit - in case reconstruction slows down your system despite | |
90 | * idle IO detection. | |
91 | * | |
92 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 93 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
94 | */ |
95 | ||
96 | static int sysctl_speed_limit_min = 1000; | |
97 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 98 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
99 | { |
100 | return mddev->sync_speed_min ? | |
101 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
102 | } | |
103 | ||
fd01b88c | 104 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
105 | { |
106 | return mddev->sync_speed_max ? | |
107 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
108 | } | |
1da177e4 LT |
109 | |
110 | static struct ctl_table_header *raid_table_header; | |
111 | ||
82592c38 | 112 | static struct ctl_table raid_table[] = { |
1da177e4 | 113 | { |
1da177e4 LT |
114 | .procname = "speed_limit_min", |
115 | .data = &sysctl_speed_limit_min, | |
116 | .maxlen = sizeof(int), | |
80ca3a44 | 117 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 118 | .proc_handler = proc_dointvec, |
1da177e4 LT |
119 | }, |
120 | { | |
1da177e4 LT |
121 | .procname = "speed_limit_max", |
122 | .data = &sysctl_speed_limit_max, | |
123 | .maxlen = sizeof(int), | |
80ca3a44 | 124 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 125 | .proc_handler = proc_dointvec, |
1da177e4 | 126 | }, |
894d2491 | 127 | { } |
1da177e4 LT |
128 | }; |
129 | ||
82592c38 | 130 | static struct ctl_table raid_dir_table[] = { |
1da177e4 | 131 | { |
1da177e4 LT |
132 | .procname = "raid", |
133 | .maxlen = 0, | |
80ca3a44 | 134 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
135 | .child = raid_table, |
136 | }, | |
894d2491 | 137 | { } |
1da177e4 LT |
138 | }; |
139 | ||
82592c38 | 140 | static struct ctl_table raid_root_table[] = { |
1da177e4 | 141 | { |
1da177e4 LT |
142 | .procname = "dev", |
143 | .maxlen = 0, | |
144 | .mode = 0555, | |
145 | .child = raid_dir_table, | |
146 | }, | |
894d2491 | 147 | { } |
1da177e4 LT |
148 | }; |
149 | ||
83d5cde4 | 150 | static const struct block_device_operations md_fops; |
1da177e4 | 151 | |
f91de92e N |
152 | static int start_readonly; |
153 | ||
a167f663 N |
154 | /* bio_clone_mddev |
155 | * like bio_clone, but with a local bio set | |
156 | */ | |
157 | ||
a167f663 | 158 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 159 | struct mddev *mddev) |
a167f663 N |
160 | { |
161 | struct bio *b; | |
a167f663 N |
162 | |
163 | if (!mddev || !mddev->bio_set) | |
164 | return bio_alloc(gfp_mask, nr_iovecs); | |
165 | ||
395c72a7 | 166 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
167 | if (!b) |
168 | return NULL; | |
a167f663 N |
169 | return b; |
170 | } | |
171 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
172 | ||
173 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 174 | struct mddev *mddev) |
a167f663 | 175 | { |
a167f663 N |
176 | if (!mddev || !mddev->bio_set) |
177 | return bio_clone(bio, gfp_mask); | |
178 | ||
bf800ef1 | 179 | return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
a167f663 N |
180 | } |
181 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
182 | ||
d7603b7e N |
183 | /* |
184 | * We have a system wide 'event count' that is incremented | |
185 | * on any 'interesting' event, and readers of /proc/mdstat | |
186 | * can use 'poll' or 'select' to find out when the event | |
187 | * count increases. | |
188 | * | |
189 | * Events are: | |
190 | * start array, stop array, error, add device, remove device, | |
191 | * start build, activate spare | |
192 | */ | |
2989ddbd | 193 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 194 | static atomic_t md_event_count; |
fd01b88c | 195 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
196 | { |
197 | atomic_inc(&md_event_count); | |
198 | wake_up(&md_event_waiters); | |
199 | } | |
29269553 | 200 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 201 | |
c331eb04 N |
202 | /* Alternate version that can be called from interrupts |
203 | * when calling sysfs_notify isn't needed. | |
204 | */ | |
fd01b88c | 205 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
206 | { |
207 | atomic_inc(&md_event_count); | |
208 | wake_up(&md_event_waiters); | |
209 | } | |
210 | ||
1da177e4 LT |
211 | /* |
212 | * Enables to iterate over all existing md arrays | |
213 | * all_mddevs_lock protects this list. | |
214 | */ | |
215 | static LIST_HEAD(all_mddevs); | |
216 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
217 | ||
1da177e4 LT |
218 | /* |
219 | * iterates through all used mddevs in the system. | |
220 | * We take care to grab the all_mddevs_lock whenever navigating | |
221 | * the list, and to always hold a refcount when unlocked. | |
222 | * Any code which breaks out of this loop while own | |
223 | * a reference to the current mddev and must mddev_put it. | |
224 | */ | |
fd01b88c | 225 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 | 226 | \ |
f72ffdd6 | 227 | for (({ spin_lock(&all_mddevs_lock); \ |
fd01b88c N |
228 | _tmp = all_mddevs.next; \ |
229 | _mddev = NULL;}); \ | |
230 | ({ if (_tmp != &all_mddevs) \ | |
231 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 232 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
233 | if (_mddev) mddev_put(_mddev); \ |
234 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
235 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 236 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 237 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
238 | ) |
239 | ||
409c57f3 N |
240 | /* Rather than calling directly into the personality make_request function, |
241 | * IO requests come here first so that we can check if the device is | |
242 | * being suspended pending a reconfiguration. | |
243 | * We hold a refcount over the call to ->make_request. By the time that | |
244 | * call has finished, the bio has been linked into some internal structure | |
245 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
246 | */ | |
5a7bbad2 | 247 | static void md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 248 | { |
49077326 | 249 | const int rw = bio_data_dir(bio); |
fd01b88c | 250 | struct mddev *mddev = q->queuedata; |
e91ece55 | 251 | unsigned int sectors; |
49077326 | 252 | |
0ca69886 N |
253 | if (mddev == NULL || mddev->pers == NULL |
254 | || !mddev->ready) { | |
409c57f3 | 255 | bio_io_error(bio); |
5a7bbad2 | 256 | return; |
409c57f3 | 257 | } |
bbfa57c0 SR |
258 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
259 | bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS); | |
260 | return; | |
261 | } | |
0ca69886 | 262 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 263 | rcu_read_lock(); |
e9c7469b | 264 | if (mddev->suspended) { |
409c57f3 N |
265 | DEFINE_WAIT(__wait); |
266 | for (;;) { | |
267 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
268 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 269 | if (!mddev->suspended) |
409c57f3 N |
270 | break; |
271 | rcu_read_unlock(); | |
272 | schedule(); | |
273 | rcu_read_lock(); | |
274 | } | |
275 | finish_wait(&mddev->sb_wait, &__wait); | |
276 | } | |
277 | atomic_inc(&mddev->active_io); | |
278 | rcu_read_unlock(); | |
49077326 | 279 | |
e91ece55 CM |
280 | /* |
281 | * save the sectors now since our bio can | |
282 | * go away inside make_request | |
283 | */ | |
284 | sectors = bio_sectors(bio); | |
5a7bbad2 | 285 | mddev->pers->make_request(mddev, bio); |
49077326 | 286 | |
18c0b223 | 287 | generic_start_io_acct(rw, sectors, &mddev->gendisk->part0); |
49077326 | 288 | |
409c57f3 N |
289 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
290 | wake_up(&mddev->sb_wait); | |
409c57f3 N |
291 | } |
292 | ||
9e35b99c N |
293 | /* mddev_suspend makes sure no new requests are submitted |
294 | * to the device, and that any requests that have been submitted | |
295 | * are completely handled. | |
afa0f557 N |
296 | * Once mddev_detach() is called and completes, the module will be |
297 | * completely unused. | |
9e35b99c | 298 | */ |
fd01b88c | 299 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
300 | { |
301 | BUG_ON(mddev->suspended); | |
302 | mddev->suspended = 1; | |
303 | synchronize_rcu(); | |
304 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
305 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
306 | |
307 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 308 | } |
390ee602 | 309 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 310 | |
fd01b88c | 311 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
312 | { |
313 | mddev->suspended = 0; | |
314 | wake_up(&mddev->sb_wait); | |
315 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 316 | |
47525e59 | 317 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
318 | md_wakeup_thread(mddev->thread); |
319 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 320 | } |
390ee602 | 321 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 322 | |
fd01b88c | 323 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 | 324 | { |
5c675f83 N |
325 | struct md_personality *pers = mddev->pers; |
326 | int ret = 0; | |
327 | ||
328 | rcu_read_lock(); | |
329 | if (mddev->suspended) | |
330 | ret = 1; | |
331 | else if (pers && pers->congested) | |
332 | ret = pers->congested(mddev, bits); | |
333 | rcu_read_unlock(); | |
334 | return ret; | |
335 | } | |
336 | EXPORT_SYMBOL_GPL(mddev_congested); | |
337 | static int md_congested(void *data, int bits) | |
338 | { | |
339 | struct mddev *mddev = data; | |
340 | return mddev_congested(mddev, bits); | |
3fa841d7 | 341 | } |
3fa841d7 | 342 | |
64590f45 N |
343 | static int md_mergeable_bvec(struct request_queue *q, |
344 | struct bvec_merge_data *bvm, | |
345 | struct bio_vec *biovec) | |
346 | { | |
347 | struct mddev *mddev = q->queuedata; | |
348 | int ret; | |
349 | rcu_read_lock(); | |
350 | if (mddev->suspended) { | |
351 | /* Must always allow one vec */ | |
352 | if (bvm->bi_size == 0) | |
353 | ret = biovec->bv_len; | |
354 | else | |
355 | ret = 0; | |
356 | } else { | |
357 | struct md_personality *pers = mddev->pers; | |
358 | if (pers && pers->mergeable_bvec) | |
359 | ret = pers->mergeable_bvec(mddev, bvm, biovec); | |
360 | else | |
361 | ret = biovec->bv_len; | |
362 | } | |
363 | rcu_read_unlock(); | |
364 | return ret; | |
365 | } | |
a2826aa9 | 366 | /* |
e9c7469b | 367 | * Generic flush handling for md |
a2826aa9 N |
368 | */ |
369 | ||
e9c7469b | 370 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 | 371 | { |
3cb03002 | 372 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 373 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
374 | |
375 | rdev_dec_pending(rdev, mddev); | |
376 | ||
377 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 378 | /* The pre-request flush has finished */ |
e804ac78 | 379 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
380 | } |
381 | bio_put(bio); | |
382 | } | |
383 | ||
a7a07e69 N |
384 | static void md_submit_flush_data(struct work_struct *ws); |
385 | ||
a035fc3e | 386 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 387 | { |
fd01b88c | 388 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 389 | struct md_rdev *rdev; |
a2826aa9 | 390 | |
a7a07e69 N |
391 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
392 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 393 | rcu_read_lock(); |
dafb20fa | 394 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
395 | if (rdev->raid_disk >= 0 && |
396 | !test_bit(Faulty, &rdev->flags)) { | |
397 | /* Take two references, one is dropped | |
398 | * when request finishes, one after | |
399 | * we reclaim rcu_read_lock | |
400 | */ | |
401 | struct bio *bi; | |
402 | atomic_inc(&rdev->nr_pending); | |
403 | atomic_inc(&rdev->nr_pending); | |
404 | rcu_read_unlock(); | |
b5e1b8ce | 405 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 406 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
407 | bi->bi_private = rdev; |
408 | bi->bi_bdev = rdev->bdev; | |
409 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 410 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
411 | rcu_read_lock(); |
412 | rdev_dec_pending(rdev, mddev); | |
413 | } | |
414 | rcu_read_unlock(); | |
a7a07e69 N |
415 | if (atomic_dec_and_test(&mddev->flush_pending)) |
416 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
417 | } |
418 | ||
e9c7469b | 419 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 420 | { |
fd01b88c | 421 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 422 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 423 | |
4f024f37 | 424 | if (bio->bi_iter.bi_size == 0) |
a2826aa9 N |
425 | /* an empty barrier - all done */ |
426 | bio_endio(bio, 0); | |
427 | else { | |
e9c7469b | 428 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 429 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 430 | } |
2b74e12e N |
431 | |
432 | mddev->flush_bio = NULL; | |
433 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
434 | } |
435 | ||
fd01b88c | 436 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 | 437 | { |
85572d7c | 438 | spin_lock_irq(&mddev->lock); |
a2826aa9 | 439 | wait_event_lock_irq(mddev->sb_wait, |
e9c7469b | 440 | !mddev->flush_bio, |
85572d7c | 441 | mddev->lock); |
e9c7469b | 442 | mddev->flush_bio = bio; |
85572d7c | 443 | spin_unlock_irq(&mddev->lock); |
a2826aa9 | 444 | |
a035fc3e N |
445 | INIT_WORK(&mddev->flush_work, submit_flushes); |
446 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 447 | } |
e9c7469b | 448 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 449 | |
74018dc3 | 450 | void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
97658cdd | 451 | { |
9cbb1750 N |
452 | struct mddev *mddev = cb->data; |
453 | md_wakeup_thread(mddev->thread); | |
454 | kfree(cb); | |
97658cdd | 455 | } |
9cbb1750 | 456 | EXPORT_SYMBOL(md_unplug); |
2ac87401 | 457 | |
fd01b88c | 458 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
459 | { |
460 | atomic_inc(&mddev->active); | |
461 | return mddev; | |
462 | } | |
463 | ||
5fd3a17e | 464 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 465 | |
fd01b88c | 466 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 467 | { |
a167f663 N |
468 | struct bio_set *bs = NULL; |
469 | ||
1da177e4 LT |
470 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
471 | return; | |
d3374825 | 472 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
473 | mddev->ctime == 0 && !mddev->hold_active) { |
474 | /* Array is not configured at all, and not held active, | |
475 | * so destroy it */ | |
af8a2434 | 476 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
477 | bs = mddev->bio_set; |
478 | mddev->bio_set = NULL; | |
d3374825 | 479 | if (mddev->gendisk) { |
e804ac78 TH |
480 | /* We did a probe so need to clean up. Call |
481 | * queue_work inside the spinlock so that | |
482 | * flush_workqueue() after mddev_find will | |
483 | * succeed in waiting for the work to be done. | |
d3374825 N |
484 | */ |
485 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 486 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
487 | } else |
488 | kfree(mddev); | |
489 | } | |
490 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
491 | if (bs) |
492 | bioset_free(bs); | |
1da177e4 LT |
493 | } |
494 | ||
fd01b88c | 495 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
496 | { |
497 | mutex_init(&mddev->open_mutex); | |
498 | mutex_init(&mddev->reconfig_mutex); | |
499 | mutex_init(&mddev->bitmap_info.mutex); | |
500 | INIT_LIST_HEAD(&mddev->disks); | |
501 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
502 | init_timer(&mddev->safemode_timer); | |
503 | atomic_set(&mddev->active, 1); | |
504 | atomic_set(&mddev->openers, 0); | |
505 | atomic_set(&mddev->active_io, 0); | |
85572d7c | 506 | spin_lock_init(&mddev->lock); |
fafd7fb0 N |
507 | atomic_set(&mddev->flush_pending, 0); |
508 | init_waitqueue_head(&mddev->sb_wait); | |
509 | init_waitqueue_head(&mddev->recovery_wait); | |
510 | mddev->reshape_position = MaxSector; | |
2c810cdd | 511 | mddev->reshape_backwards = 0; |
c4a39551 | 512 | mddev->last_sync_action = "none"; |
fafd7fb0 N |
513 | mddev->resync_min = 0; |
514 | mddev->resync_max = MaxSector; | |
515 | mddev->level = LEVEL_NONE; | |
516 | } | |
390ee602 | 517 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 518 | |
f72ffdd6 | 519 | static struct mddev *mddev_find(dev_t unit) |
1da177e4 | 520 | { |
fd01b88c | 521 | struct mddev *mddev, *new = NULL; |
1da177e4 | 522 | |
8f5f02c4 N |
523 | if (unit && MAJOR(unit) != MD_MAJOR) |
524 | unit &= ~((1<<MdpMinorShift)-1); | |
525 | ||
1da177e4 LT |
526 | retry: |
527 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
528 | |
529 | if (unit) { | |
530 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
531 | if (mddev->unit == unit) { | |
532 | mddev_get(mddev); | |
533 | spin_unlock(&all_mddevs_lock); | |
534 | kfree(new); | |
535 | return mddev; | |
536 | } | |
537 | ||
538 | if (new) { | |
539 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 540 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
541 | new->hold_active = UNTIL_IOCTL; |
542 | return new; | |
1da177e4 | 543 | } |
efeb53c0 N |
544 | } else if (new) { |
545 | /* find an unused unit number */ | |
546 | static int next_minor = 512; | |
547 | int start = next_minor; | |
548 | int is_free = 0; | |
549 | int dev = 0; | |
550 | while (!is_free) { | |
551 | dev = MKDEV(MD_MAJOR, next_minor); | |
552 | next_minor++; | |
553 | if (next_minor > MINORMASK) | |
554 | next_minor = 0; | |
555 | if (next_minor == start) { | |
556 | /* Oh dear, all in use. */ | |
557 | spin_unlock(&all_mddevs_lock); | |
558 | kfree(new); | |
559 | return NULL; | |
560 | } | |
f72ffdd6 | 561 | |
efeb53c0 N |
562 | is_free = 1; |
563 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
564 | if (mddev->unit == dev) { | |
565 | is_free = 0; | |
566 | break; | |
567 | } | |
568 | } | |
569 | new->unit = dev; | |
570 | new->md_minor = MINOR(dev); | |
571 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
572 | list_add(&new->all_mddevs, &all_mddevs); |
573 | spin_unlock(&all_mddevs_lock); | |
574 | return new; | |
575 | } | |
576 | spin_unlock(&all_mddevs_lock); | |
577 | ||
9ffae0cf | 578 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
579 | if (!new) |
580 | return NULL; | |
581 | ||
1da177e4 LT |
582 | new->unit = unit; |
583 | if (MAJOR(unit) == MD_MAJOR) | |
584 | new->md_minor = MINOR(unit); | |
585 | else | |
586 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
587 | ||
fafd7fb0 | 588 | mddev_init(new); |
1da177e4 | 589 | |
1da177e4 LT |
590 | goto retry; |
591 | } | |
592 | ||
f72ffdd6 | 593 | static inline int __must_check mddev_lock(struct mddev *mddev) |
1da177e4 | 594 | { |
df5b89b3 | 595 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
596 | } |
597 | ||
29f097c4 N |
598 | /* Sometimes we need to take the lock in a situation where |
599 | * failure due to interrupts is not acceptable. | |
600 | */ | |
f72ffdd6 | 601 | static inline void mddev_lock_nointr(struct mddev *mddev) |
29f097c4 N |
602 | { |
603 | mutex_lock(&mddev->reconfig_mutex); | |
604 | } | |
605 | ||
fd01b88c | 606 | static inline int mddev_is_locked(struct mddev *mddev) |
b522adcd DW |
607 | { |
608 | return mutex_is_locked(&mddev->reconfig_mutex); | |
609 | } | |
610 | ||
f72ffdd6 | 611 | static inline int mddev_trylock(struct mddev *mddev) |
1da177e4 | 612 | { |
df5b89b3 | 613 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
614 | } |
615 | ||
b6eb127d N |
616 | static struct attribute_group md_redundancy_group; |
617 | ||
f72ffdd6 | 618 | static void mddev_unlock(struct mddev *mddev) |
1da177e4 | 619 | { |
a64c876f | 620 | if (mddev->to_remove) { |
b6eb127d N |
621 | /* These cannot be removed under reconfig_mutex as |
622 | * an access to the files will try to take reconfig_mutex | |
623 | * while holding the file unremovable, which leads to | |
624 | * a deadlock. | |
bb4f1e9d N |
625 | * So hold set sysfs_active while the remove in happeing, |
626 | * and anything else which might set ->to_remove or my | |
627 | * otherwise change the sysfs namespace will fail with | |
628 | * -EBUSY if sysfs_active is still set. | |
629 | * We set sysfs_active under reconfig_mutex and elsewhere | |
630 | * test it under the same mutex to ensure its correct value | |
631 | * is seen. | |
b6eb127d | 632 | */ |
a64c876f N |
633 | struct attribute_group *to_remove = mddev->to_remove; |
634 | mddev->to_remove = NULL; | |
bb4f1e9d | 635 | mddev->sysfs_active = 1; |
b6eb127d N |
636 | mutex_unlock(&mddev->reconfig_mutex); |
637 | ||
00bcb4ac N |
638 | if (mddev->kobj.sd) { |
639 | if (to_remove != &md_redundancy_group) | |
640 | sysfs_remove_group(&mddev->kobj, to_remove); | |
641 | if (mddev->pers == NULL || | |
642 | mddev->pers->sync_request == NULL) { | |
643 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
644 | if (mddev->sysfs_action) | |
645 | sysfs_put(mddev->sysfs_action); | |
646 | mddev->sysfs_action = NULL; | |
647 | } | |
a64c876f | 648 | } |
bb4f1e9d | 649 | mddev->sysfs_active = 0; |
b6eb127d N |
650 | } else |
651 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 652 | |
751e67ca CD |
653 | /* As we've dropped the mutex we need a spinlock to |
654 | * make sure the thread doesn't disappear | |
01f96c0a N |
655 | */ |
656 | spin_lock(&pers_lock); | |
005eca5e | 657 | md_wakeup_thread(mddev->thread); |
01f96c0a | 658 | spin_unlock(&pers_lock); |
1da177e4 LT |
659 | } |
660 | ||
1ca69c4b N |
661 | static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr) |
662 | { | |
663 | struct md_rdev *rdev; | |
664 | ||
665 | rdev_for_each_rcu(rdev, mddev) | |
666 | if (rdev->desc_nr == nr) | |
667 | return rdev; | |
668 | ||
669 | return NULL; | |
670 | } | |
671 | ||
672 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 673 | { |
3cb03002 | 674 | struct md_rdev *rdev; |
1da177e4 | 675 | |
dafb20fa | 676 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
677 | if (rdev->bdev->bd_dev == dev) |
678 | return rdev; | |
159ec1fc | 679 | |
1da177e4 LT |
680 | return NULL; |
681 | } | |
682 | ||
1ca69c4b N |
683 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
684 | { | |
685 | struct md_rdev *rdev; | |
686 | ||
687 | rdev_for_each_rcu(rdev, mddev) | |
688 | if (rdev->bdev->bd_dev == dev) | |
689 | return rdev; | |
690 | ||
691 | return NULL; | |
692 | } | |
693 | ||
84fc4b56 | 694 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 695 | { |
84fc4b56 | 696 | struct md_personality *pers; |
d9d166c2 N |
697 | list_for_each_entry(pers, &pers_list, list) { |
698 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 699 | return pers; |
d9d166c2 N |
700 | if (strcmp(pers->name, clevel)==0) |
701 | return pers; | |
702 | } | |
2604b703 N |
703 | return NULL; |
704 | } | |
705 | ||
b73df2d3 | 706 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 707 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 708 | { |
57b2caa3 | 709 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 710 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
711 | } |
712 | ||
f72ffdd6 | 713 | static int alloc_disk_sb(struct md_rdev *rdev) |
1da177e4 | 714 | { |
1da177e4 LT |
715 | rdev->sb_page = alloc_page(GFP_KERNEL); |
716 | if (!rdev->sb_page) { | |
717 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 718 | return -ENOMEM; |
1da177e4 LT |
719 | } |
720 | ||
721 | return 0; | |
722 | } | |
723 | ||
545c8795 | 724 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
725 | { |
726 | if (rdev->sb_page) { | |
2d1f3b5d | 727 | put_page(rdev->sb_page); |
1da177e4 LT |
728 | rdev->sb_loaded = 0; |
729 | rdev->sb_page = NULL; | |
0f420358 | 730 | rdev->sb_start = 0; |
dd8ac336 | 731 | rdev->sectors = 0; |
1da177e4 | 732 | } |
2699b672 N |
733 | if (rdev->bb_page) { |
734 | put_page(rdev->bb_page); | |
735 | rdev->bb_page = NULL; | |
736 | } | |
4fa2f327 N |
737 | kfree(rdev->badblocks.page); |
738 | rdev->badblocks.page = NULL; | |
1da177e4 | 739 | } |
545c8795 | 740 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 741 | |
6712ecf8 | 742 | static void super_written(struct bio *bio, int error) |
7bfa19f2 | 743 | { |
3cb03002 | 744 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 745 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 746 | |
3a0f5bbb N |
747 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
748 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
749 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
750 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 751 | md_error(mddev, rdev); |
3a0f5bbb | 752 | } |
7bfa19f2 | 753 | |
a9701a30 N |
754 | if (atomic_dec_and_test(&mddev->pending_writes)) |
755 | wake_up(&mddev->sb_wait); | |
f8b58edf | 756 | bio_put(bio); |
7bfa19f2 N |
757 | } |
758 | ||
fd01b88c | 759 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
760 | sector_t sector, int size, struct page *page) |
761 | { | |
762 | /* write first size bytes of page to sector of rdev | |
763 | * Increment mddev->pending_writes before returning | |
764 | * and decrement it on completion, waking up sb_wait | |
765 | * if zero is reached. | |
766 | * If an error occurred, call md_error | |
767 | */ | |
a167f663 | 768 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 769 | |
a6ff7e08 | 770 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
4f024f37 | 771 | bio->bi_iter.bi_sector = sector; |
7bfa19f2 N |
772 | bio_add_page(bio, page, size, 0); |
773 | bio->bi_private = rdev; | |
774 | bio->bi_end_io = super_written; | |
a9701a30 | 775 | |
7bfa19f2 | 776 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 777 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
778 | } |
779 | ||
fd01b88c | 780 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 781 | { |
e9c7469b | 782 | /* wait for all superblock writes that were scheduled to complete */ |
1967cd56 | 783 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
7bfa19f2 N |
784 | } |
785 | ||
3cb03002 | 786 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 787 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 788 | { |
a167f663 | 789 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
790 | int ret; |
791 | ||
a6ff7e08 JB |
792 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
793 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 | 794 | if (metadata_op) |
4f024f37 | 795 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
1fdd6fc9 N |
796 | else if (rdev->mddev->reshape_position != MaxSector && |
797 | (rdev->mddev->reshape_backwards == | |
798 | (sector >= rdev->mddev->reshape_position))) | |
4f024f37 | 799 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
ccebd4c4 | 800 | else |
4f024f37 | 801 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
1da177e4 | 802 | bio_add_page(bio, page, size, 0); |
c170bbb4 | 803 | submit_bio_wait(rw, bio); |
1da177e4 LT |
804 | |
805 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
806 | bio_put(bio); | |
807 | return ret; | |
808 | } | |
a8745db2 | 809 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 810 | |
f72ffdd6 | 811 | static int read_disk_sb(struct md_rdev *rdev, int size) |
1da177e4 LT |
812 | { |
813 | char b[BDEVNAME_SIZE]; | |
403df478 | 814 | |
1da177e4 LT |
815 | if (rdev->sb_loaded) |
816 | return 0; | |
817 | ||
ccebd4c4 | 818 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
819 | goto fail; |
820 | rdev->sb_loaded = 1; | |
821 | return 0; | |
822 | ||
823 | fail: | |
824 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
825 | bdevname(rdev->bdev,b)); | |
826 | return -EINVAL; | |
827 | } | |
828 | ||
829 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
830 | { | |
f72ffdd6 | 831 | return sb1->set_uuid0 == sb2->set_uuid0 && |
05710466 AN |
832 | sb1->set_uuid1 == sb2->set_uuid1 && |
833 | sb1->set_uuid2 == sb2->set_uuid2 && | |
834 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
835 | } |
836 | ||
1da177e4 LT |
837 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
838 | { | |
839 | int ret; | |
840 | mdp_super_t *tmp1, *tmp2; | |
841 | ||
842 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
843 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
844 | ||
845 | if (!tmp1 || !tmp2) { | |
846 | ret = 0; | |
35020f1a | 847 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
848 | goto abort; |
849 | } | |
850 | ||
851 | *tmp1 = *sb1; | |
852 | *tmp2 = *sb2; | |
853 | ||
854 | /* | |
855 | * nr_disks is not constant | |
856 | */ | |
857 | tmp1->nr_disks = 0; | |
858 | tmp2->nr_disks = 0; | |
859 | ||
ce0c8e05 | 860 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 861 | abort: |
990a8baf JJ |
862 | kfree(tmp1); |
863 | kfree(tmp2); | |
1da177e4 LT |
864 | return ret; |
865 | } | |
866 | ||
4d167f09 N |
867 | static u32 md_csum_fold(u32 csum) |
868 | { | |
869 | csum = (csum & 0xffff) + (csum >> 16); | |
870 | return (csum & 0xffff) + (csum >> 16); | |
871 | } | |
872 | ||
f72ffdd6 | 873 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
1da177e4 | 874 | { |
4d167f09 N |
875 | u64 newcsum = 0; |
876 | u32 *sb32 = (u32*)sb; | |
877 | int i; | |
1da177e4 LT |
878 | unsigned int disk_csum, csum; |
879 | ||
880 | disk_csum = sb->sb_csum; | |
881 | sb->sb_csum = 0; | |
4d167f09 N |
882 | |
883 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
884 | newcsum += sb32[i]; | |
885 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
886 | ||
4d167f09 N |
887 | #ifdef CONFIG_ALPHA |
888 | /* This used to use csum_partial, which was wrong for several | |
889 | * reasons including that different results are returned on | |
890 | * different architectures. It isn't critical that we get exactly | |
891 | * the same return value as before (we always csum_fold before | |
892 | * testing, and that removes any differences). However as we | |
893 | * know that csum_partial always returned a 16bit value on | |
894 | * alphas, do a fold to maximise conformity to previous behaviour. | |
895 | */ | |
896 | sb->sb_csum = md_csum_fold(disk_csum); | |
897 | #else | |
1da177e4 | 898 | sb->sb_csum = disk_csum; |
4d167f09 | 899 | #endif |
1da177e4 LT |
900 | return csum; |
901 | } | |
902 | ||
1da177e4 LT |
903 | /* |
904 | * Handle superblock details. | |
905 | * We want to be able to handle multiple superblock formats | |
906 | * so we have a common interface to them all, and an array of | |
907 | * different handlers. | |
908 | * We rely on user-space to write the initial superblock, and support | |
909 | * reading and updating of superblocks. | |
910 | * Interface methods are: | |
3cb03002 | 911 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
912 | * loads and validates a superblock on dev. |
913 | * if refdev != NULL, compare superblocks on both devices | |
914 | * Return: | |
915 | * 0 - dev has a superblock that is compatible with refdev | |
916 | * 1 - dev has a superblock that is compatible and newer than refdev | |
917 | * so dev should be used as the refdev in future | |
918 | * -EINVAL superblock incompatible or invalid | |
919 | * -othererror e.g. -EIO | |
920 | * | |
fd01b88c | 921 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
922 | * Verify that dev is acceptable into mddev. |
923 | * The first time, mddev->raid_disks will be 0, and data from | |
924 | * dev should be merged in. Subsequent calls check that dev | |
925 | * is new enough. Return 0 or -EINVAL | |
926 | * | |
fd01b88c | 927 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
928 | * Update the superblock for rdev with data in mddev |
929 | * This does not write to disc. | |
930 | * | |
931 | */ | |
932 | ||
933 | struct super_type { | |
0cd17fec CW |
934 | char *name; |
935 | struct module *owner; | |
c6563a8c N |
936 | int (*load_super)(struct md_rdev *rdev, |
937 | struct md_rdev *refdev, | |
0cd17fec | 938 | int minor_version); |
c6563a8c N |
939 | int (*validate_super)(struct mddev *mddev, |
940 | struct md_rdev *rdev); | |
941 | void (*sync_super)(struct mddev *mddev, | |
942 | struct md_rdev *rdev); | |
3cb03002 | 943 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 944 | sector_t num_sectors); |
c6563a8c N |
945 | int (*allow_new_offset)(struct md_rdev *rdev, |
946 | unsigned long long new_offset); | |
1da177e4 LT |
947 | }; |
948 | ||
0894cc30 AN |
949 | /* |
950 | * Check that the given mddev has no bitmap. | |
951 | * | |
952 | * This function is called from the run method of all personalities that do not | |
953 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
954 | * has a bitmap. Otherwise, it returns 0. | |
955 | * | |
956 | */ | |
fd01b88c | 957 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 958 | { |
c3d9714e | 959 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
960 | return 0; |
961 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
962 | mdname(mddev), mddev->pers->name); | |
963 | return 1; | |
964 | } | |
965 | EXPORT_SYMBOL(md_check_no_bitmap); | |
966 | ||
1da177e4 | 967 | /* |
f72ffdd6 | 968 | * load_super for 0.90.0 |
1da177e4 | 969 | */ |
3cb03002 | 970 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
971 | { |
972 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
973 | mdp_super_t *sb; | |
974 | int ret; | |
1da177e4 LT |
975 | |
976 | /* | |
0f420358 | 977 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
978 | * it's at the end of the disk. |
979 | * | |
980 | * It also happens to be a multiple of 4Kb. | |
981 | */ | |
57b2caa3 | 982 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 983 | |
0002b271 | 984 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
985 | if (ret) return ret; |
986 | ||
987 | ret = -EINVAL; | |
988 | ||
989 | bdevname(rdev->bdev, b); | |
65a06f06 | 990 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
991 | |
992 | if (sb->md_magic != MD_SB_MAGIC) { | |
993 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
994 | b); | |
995 | goto abort; | |
996 | } | |
997 | ||
998 | if (sb->major_version != 0 || | |
f6705578 N |
999 | sb->minor_version < 90 || |
1000 | sb->minor_version > 91) { | |
1da177e4 LT |
1001 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1002 | sb->major_version, sb->minor_version, | |
1003 | b); | |
1004 | goto abort; | |
1005 | } | |
1006 | ||
1007 | if (sb->raid_disks <= 0) | |
1008 | goto abort; | |
1009 | ||
4d167f09 | 1010 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1011 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1012 | b); | |
1013 | goto abort; | |
1014 | } | |
1015 | ||
1016 | rdev->preferred_minor = sb->md_minor; | |
1017 | rdev->data_offset = 0; | |
c6563a8c | 1018 | rdev->new_data_offset = 0; |
0002b271 | 1019 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1020 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1021 | |
1022 | if (sb->level == LEVEL_MULTIPATH) | |
1023 | rdev->desc_nr = -1; | |
1024 | else | |
1025 | rdev->desc_nr = sb->this_disk.number; | |
1026 | ||
9a7b2b0f | 1027 | if (!refdev) { |
1da177e4 | 1028 | ret = 1; |
9a7b2b0f | 1029 | } else { |
1da177e4 | 1030 | __u64 ev1, ev2; |
65a06f06 | 1031 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1032 | if (!uuid_equal(refsb, sb)) { |
1033 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1034 | b, bdevname(refdev->bdev,b2)); | |
1035 | goto abort; | |
1036 | } | |
1037 | if (!sb_equal(refsb, sb)) { | |
1038 | printk(KERN_WARNING "md: %s has same UUID" | |
1039 | " but different superblock to %s\n", | |
1040 | b, bdevname(refdev->bdev, b2)); | |
1041 | goto abort; | |
1042 | } | |
1043 | ev1 = md_event(sb); | |
1044 | ev2 = md_event(refsb); | |
1045 | if (ev1 > ev2) | |
1046 | ret = 1; | |
f72ffdd6 | 1047 | else |
1da177e4 LT |
1048 | ret = 0; |
1049 | } | |
8190e754 | 1050 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1051 | /* Limit to 4TB as metadata cannot record more than that. |
1052 | * (not needed for Linear and RAID0 as metadata doesn't | |
1053 | * record this size) | |
1054 | */ | |
1055 | if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) | |
27a7b260 | 1056 | rdev->sectors = (2ULL << 32) - 2; |
1da177e4 | 1057 | |
27a7b260 | 1058 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1059 | /* "this cannot possibly happen" ... */ |
1060 | ret = -EINVAL; | |
1061 | ||
1da177e4 LT |
1062 | abort: |
1063 | return ret; | |
1064 | } | |
1065 | ||
1066 | /* | |
1067 | * validate_super for 0.90.0 | |
1068 | */ | |
fd01b88c | 1069 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1070 | { |
1071 | mdp_disk_t *desc; | |
65a06f06 | 1072 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1073 | __u64 ev1 = md_event(sb); |
1da177e4 | 1074 | |
41158c7e | 1075 | rdev->raid_disk = -1; |
c5d79adb N |
1076 | clear_bit(Faulty, &rdev->flags); |
1077 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1078 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1079 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1080 | |
1da177e4 LT |
1081 | if (mddev->raid_disks == 0) { |
1082 | mddev->major_version = 0; | |
1083 | mddev->minor_version = sb->minor_version; | |
1084 | mddev->patch_version = sb->patch_version; | |
e691063a | 1085 | mddev->external = 0; |
9d8f0363 | 1086 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1087 | mddev->ctime = sb->ctime; |
1088 | mddev->utime = sb->utime; | |
1089 | mddev->level = sb->level; | |
d9d166c2 | 1090 | mddev->clevel[0] = 0; |
1da177e4 LT |
1091 | mddev->layout = sb->layout; |
1092 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1093 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1094 | mddev->events = ev1; |
c3d9714e | 1095 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1096 | mddev->bitmap_info.space = 0; |
1097 | /* bitmap can use 60 K after the 4K superblocks */ | |
c3d9714e | 1098 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 1099 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
2c810cdd | 1100 | mddev->reshape_backwards = 0; |
1da177e4 | 1101 | |
f6705578 N |
1102 | if (mddev->minor_version >= 91) { |
1103 | mddev->reshape_position = sb->reshape_position; | |
1104 | mddev->delta_disks = sb->delta_disks; | |
1105 | mddev->new_level = sb->new_level; | |
1106 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1107 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1108 | if (mddev->delta_disks < 0) |
1109 | mddev->reshape_backwards = 1; | |
f6705578 N |
1110 | } else { |
1111 | mddev->reshape_position = MaxSector; | |
1112 | mddev->delta_disks = 0; | |
1113 | mddev->new_level = mddev->level; | |
1114 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1115 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1116 | } |
1117 | ||
1da177e4 LT |
1118 | if (sb->state & (1<<MD_SB_CLEAN)) |
1119 | mddev->recovery_cp = MaxSector; | |
1120 | else { | |
f72ffdd6 | 1121 | if (sb->events_hi == sb->cp_events_hi && |
1da177e4 LT |
1122 | sb->events_lo == sb->cp_events_lo) { |
1123 | mddev->recovery_cp = sb->recovery_cp; | |
1124 | } else | |
1125 | mddev->recovery_cp = 0; | |
1126 | } | |
1127 | ||
1128 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1129 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1130 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1131 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1132 | ||
1133 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1134 | |
1135 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
6409bb05 | 1136 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1137 | mddev->bitmap_info.offset = |
1138 | mddev->bitmap_info.default_offset; | |
6409bb05 | 1139 | mddev->bitmap_info.space = |
c9ad020f | 1140 | mddev->bitmap_info.default_space; |
6409bb05 | 1141 | } |
a654b9d8 | 1142 | |
41158c7e | 1143 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1144 | /* Insist on good event counter while assembling, except |
1145 | * for spares (which don't need an event count) */ | |
1da177e4 | 1146 | ++ev1; |
be6800a7 N |
1147 | if (sb->disks[rdev->desc_nr].state & ( |
1148 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
f72ffdd6 | 1149 | if (ev1 < mddev->events) |
be6800a7 | 1150 | return -EINVAL; |
41158c7e N |
1151 | } else if (mddev->bitmap) { |
1152 | /* if adding to array with a bitmap, then we can accept an | |
1153 | * older device ... but not too old. | |
1154 | */ | |
41158c7e N |
1155 | if (ev1 < mddev->bitmap->events_cleared) |
1156 | return 0; | |
8313b8e5 N |
1157 | if (ev1 < mddev->events) |
1158 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1159 | } else { |
1160 | if (ev1 < mddev->events) | |
1161 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1162 | return 0; | |
1163 | } | |
41158c7e | 1164 | |
1da177e4 | 1165 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1166 | desc = sb->disks + rdev->desc_nr; |
1167 | ||
1168 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1169 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1170 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1171 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1172 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1173 | rdev->raid_disk = desc->raid_disk; |
f466722c | 1174 | rdev->saved_raid_disk = desc->raid_disk; |
0261cd9f N |
1175 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1176 | /* active but not in sync implies recovery up to | |
1177 | * reshape position. We don't know exactly where | |
1178 | * that is, so set to zero for now */ | |
1179 | if (mddev->minor_version >= 91) { | |
1180 | rdev->recovery_offset = 0; | |
1181 | rdev->raid_disk = desc->raid_disk; | |
1182 | } | |
1da177e4 | 1183 | } |
8ddf9efe N |
1184 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1185 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1186 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1187 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1188 | return 0; |
1189 | } | |
1190 | ||
1191 | /* | |
1192 | * sync_super for 0.90.0 | |
1193 | */ | |
fd01b88c | 1194 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1195 | { |
1196 | mdp_super_t *sb; | |
3cb03002 | 1197 | struct md_rdev *rdev2; |
1da177e4 | 1198 | int next_spare = mddev->raid_disks; |
19133a42 | 1199 | |
1da177e4 LT |
1200 | /* make rdev->sb match mddev data.. |
1201 | * | |
1202 | * 1/ zero out disks | |
1203 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1204 | * 3/ any empty disks < next_spare become removed | |
1205 | * | |
1206 | * disks[0] gets initialised to REMOVED because | |
1207 | * we cannot be sure from other fields if it has | |
1208 | * been initialised or not. | |
1209 | */ | |
1210 | int i; | |
1211 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1212 | ||
61181565 N |
1213 | rdev->sb_size = MD_SB_BYTES; |
1214 | ||
65a06f06 | 1215 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1216 | |
1217 | memset(sb, 0, sizeof(*sb)); | |
1218 | ||
1219 | sb->md_magic = MD_SB_MAGIC; | |
1220 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1221 | sb->patch_version = mddev->patch_version; |
1222 | sb->gvalid_words = 0; /* ignored */ | |
1223 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1224 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1225 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1226 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1227 | ||
1228 | sb->ctime = mddev->ctime; | |
1229 | sb->level = mddev->level; | |
58c0fed4 | 1230 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1231 | sb->raid_disks = mddev->raid_disks; |
1232 | sb->md_minor = mddev->md_minor; | |
e691063a | 1233 | sb->not_persistent = 0; |
1da177e4 LT |
1234 | sb->utime = mddev->utime; |
1235 | sb->state = 0; | |
1236 | sb->events_hi = (mddev->events>>32); | |
1237 | sb->events_lo = (u32)mddev->events; | |
1238 | ||
f6705578 N |
1239 | if (mddev->reshape_position == MaxSector) |
1240 | sb->minor_version = 90; | |
1241 | else { | |
1242 | sb->minor_version = 91; | |
1243 | sb->reshape_position = mddev->reshape_position; | |
1244 | sb->new_level = mddev->new_level; | |
1245 | sb->delta_disks = mddev->delta_disks; | |
1246 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1247 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1248 | } |
1249 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1250 | if (mddev->in_sync) |
1251 | { | |
1252 | sb->recovery_cp = mddev->recovery_cp; | |
1253 | sb->cp_events_hi = (mddev->events>>32); | |
1254 | sb->cp_events_lo = (u32)mddev->events; | |
1255 | if (mddev->recovery_cp == MaxSector) | |
1256 | sb->state = (1<< MD_SB_CLEAN); | |
1257 | } else | |
1258 | sb->recovery_cp = 0; | |
1259 | ||
1260 | sb->layout = mddev->layout; | |
9d8f0363 | 1261 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1262 | |
c3d9714e | 1263 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1264 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1265 | ||
1da177e4 | 1266 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1267 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1268 | mdp_disk_t *d; |
86e6ffdd | 1269 | int desc_nr; |
0261cd9f N |
1270 | int is_active = test_bit(In_sync, &rdev2->flags); |
1271 | ||
1272 | if (rdev2->raid_disk >= 0 && | |
1273 | sb->minor_version >= 91) | |
1274 | /* we have nowhere to store the recovery_offset, | |
1275 | * but if it is not below the reshape_position, | |
1276 | * we can piggy-back on that. | |
1277 | */ | |
1278 | is_active = 1; | |
1279 | if (rdev2->raid_disk < 0 || | |
1280 | test_bit(Faulty, &rdev2->flags)) | |
1281 | is_active = 0; | |
1282 | if (is_active) | |
86e6ffdd | 1283 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1284 | else |
86e6ffdd | 1285 | desc_nr = next_spare++; |
19133a42 | 1286 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1287 | d = &sb->disks[rdev2->desc_nr]; |
1288 | nr_disks++; | |
1289 | d->number = rdev2->desc_nr; | |
1290 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1291 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1292 | if (is_active) |
1da177e4 LT |
1293 | d->raid_disk = rdev2->raid_disk; |
1294 | else | |
1295 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1296 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1297 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1298 | else if (is_active) { |
1da177e4 | 1299 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1300 | if (test_bit(In_sync, &rdev2->flags)) |
1301 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1302 | active++; |
1303 | working++; | |
1304 | } else { | |
1305 | d->state = 0; | |
1306 | spare++; | |
1307 | working++; | |
1308 | } | |
8ddf9efe N |
1309 | if (test_bit(WriteMostly, &rdev2->flags)) |
1310 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1311 | } |
1da177e4 LT |
1312 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1313 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1314 | mdp_disk_t *d = &sb->disks[i]; | |
1315 | if (d->state == 0 && d->number == 0) { | |
1316 | d->number = i; | |
1317 | d->raid_disk = i; | |
1318 | d->state = (1<<MD_DISK_REMOVED); | |
1319 | d->state |= (1<<MD_DISK_FAULTY); | |
1320 | failed++; | |
1321 | } | |
1322 | } | |
1323 | sb->nr_disks = nr_disks; | |
1324 | sb->active_disks = active; | |
1325 | sb->working_disks = working; | |
1326 | sb->failed_disks = failed; | |
1327 | sb->spare_disks = spare; | |
1328 | ||
1329 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1330 | sb->sb_csum = calc_sb_csum(sb); | |
1331 | } | |
1332 | ||
0cd17fec CW |
1333 | /* |
1334 | * rdev_size_change for 0.90.0 | |
1335 | */ | |
1336 | static unsigned long long | |
3cb03002 | 1337 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1338 | { |
58c0fed4 | 1339 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1340 | return 0; /* component must fit device */ |
c3d9714e | 1341 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1342 | return 0; /* can't move bitmap */ |
57b2caa3 | 1343 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1344 | if (!num_sectors || num_sectors > rdev->sb_start) |
1345 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1346 | /* Limit to 4TB as metadata cannot record more than that. |
1347 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1348 | */ | |
667a5313 | 1349 | if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) |
27a7b260 | 1350 | num_sectors = (2ULL << 32) - 2; |
0f420358 | 1351 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1352 | rdev->sb_page); |
1353 | md_super_wait(rdev->mddev); | |
c26a44ed | 1354 | return num_sectors; |
0cd17fec CW |
1355 | } |
1356 | ||
c6563a8c N |
1357 | static int |
1358 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1359 | { | |
1360 | /* non-zero offset changes not possible with v0.90 */ | |
1361 | return new_offset == 0; | |
1362 | } | |
0cd17fec | 1363 | |
1da177e4 LT |
1364 | /* |
1365 | * version 1 superblock | |
1366 | */ | |
1367 | ||
f72ffdd6 | 1368 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
1da177e4 | 1369 | { |
1c05b4bc N |
1370 | __le32 disk_csum; |
1371 | u32 csum; | |
1da177e4 LT |
1372 | unsigned long long newcsum; |
1373 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1374 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1375 | |
1376 | disk_csum = sb->sb_csum; | |
1377 | sb->sb_csum = 0; | |
1378 | newcsum = 0; | |
1f3c9907 | 1379 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1380 | newcsum += le32_to_cpu(*isuper++); |
1381 | ||
1382 | if (size == 2) | |
1c05b4bc | 1383 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1384 | |
1385 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1386 | sb->sb_csum = disk_csum; | |
1387 | return cpu_to_le32(csum); | |
1388 | } | |
1389 | ||
2699b672 N |
1390 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1391 | int acknowledged); | |
3cb03002 | 1392 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1393 | { |
1394 | struct mdp_superblock_1 *sb; | |
1395 | int ret; | |
0f420358 | 1396 | sector_t sb_start; |
c6563a8c | 1397 | sector_t sectors; |
1da177e4 | 1398 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1399 | int bmask; |
1da177e4 LT |
1400 | |
1401 | /* | |
0f420358 | 1402 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1403 | * It is always aligned to a 4K boundary and |
1404 | * depeding on minor_version, it can be: | |
1405 | * 0: At least 8K, but less than 12K, from end of device | |
1406 | * 1: At start of device | |
1407 | * 2: 4K from start of device. | |
1408 | */ | |
1409 | switch(minor_version) { | |
1410 | case 0: | |
77304d2a | 1411 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1412 | sb_start -= 8*2; |
1413 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1414 | break; |
1415 | case 1: | |
0f420358 | 1416 | sb_start = 0; |
1da177e4 LT |
1417 | break; |
1418 | case 2: | |
0f420358 | 1419 | sb_start = 8; |
1da177e4 LT |
1420 | break; |
1421 | default: | |
1422 | return -EINVAL; | |
1423 | } | |
0f420358 | 1424 | rdev->sb_start = sb_start; |
1da177e4 | 1425 | |
0002b271 N |
1426 | /* superblock is rarely larger than 1K, but it can be larger, |
1427 | * and it is safe to read 4k, so we do that | |
1428 | */ | |
1429 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1430 | if (ret) return ret; |
1431 | ||
65a06f06 | 1432 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1433 | |
1434 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1435 | sb->major_version != cpu_to_le32(1) || | |
1436 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1437 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1438 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1439 | return -EINVAL; |
1440 | ||
1441 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1442 | printk("md: invalid superblock checksum on %s\n", | |
1443 | bdevname(rdev->bdev,b)); | |
1444 | return -EINVAL; | |
1445 | } | |
1446 | if (le64_to_cpu(sb->data_size) < 10) { | |
1447 | printk("md: data_size too small on %s\n", | |
1448 | bdevname(rdev->bdev,b)); | |
1449 | return -EINVAL; | |
1450 | } | |
c6563a8c N |
1451 | if (sb->pad0 || |
1452 | sb->pad3[0] || | |
1453 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1454 | /* Some padding is non-zero, might be a new feature */ | |
1455 | return -EINVAL; | |
e11e93fa | 1456 | |
1da177e4 LT |
1457 | rdev->preferred_minor = 0xffff; |
1458 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1459 | rdev->new_data_offset = rdev->data_offset; |
1460 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1461 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1462 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1463 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1464 | |
0002b271 | 1465 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1466 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1467 | if (rdev->sb_size & bmask) |
a1801f85 N |
1468 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1469 | ||
1470 | if (minor_version | |
0f420358 | 1471 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1472 | return -EINVAL; |
c6563a8c N |
1473 | if (minor_version |
1474 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1475 | return -EINVAL; | |
0002b271 | 1476 | |
31b65a0d N |
1477 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1478 | rdev->desc_nr = -1; | |
1479 | else | |
1480 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1481 | ||
2699b672 N |
1482 | if (!rdev->bb_page) { |
1483 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1484 | if (!rdev->bb_page) | |
1485 | return -ENOMEM; | |
1486 | } | |
1487 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1488 | rdev->badblocks.count == 0) { | |
1489 | /* need to load the bad block list. | |
1490 | * Currently we limit it to one page. | |
1491 | */ | |
1492 | s32 offset; | |
1493 | sector_t bb_sector; | |
1494 | u64 *bbp; | |
1495 | int i; | |
1496 | int sectors = le16_to_cpu(sb->bblog_size); | |
1497 | if (sectors > (PAGE_SIZE / 512)) | |
1498 | return -EINVAL; | |
1499 | offset = le32_to_cpu(sb->bblog_offset); | |
1500 | if (offset == 0) | |
1501 | return -EINVAL; | |
1502 | bb_sector = (long long)offset; | |
1503 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1504 | rdev->bb_page, READ, true)) | |
1505 | return -EIO; | |
1506 | bbp = (u64 *)page_address(rdev->bb_page); | |
1507 | rdev->badblocks.shift = sb->bblog_shift; | |
1508 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1509 | u64 bb = le64_to_cpu(*bbp); | |
1510 | int count = bb & (0x3ff); | |
1511 | u64 sector = bb >> 10; | |
1512 | sector <<= sb->bblog_shift; | |
1513 | count <<= sb->bblog_shift; | |
1514 | if (bb + 1 == 0) | |
1515 | break; | |
1516 | if (md_set_badblocks(&rdev->badblocks, | |
1517 | sector, count, 1) == 0) | |
1518 | return -EINVAL; | |
1519 | } | |
486adf72 N |
1520 | } else if (sb->bblog_offset != 0) |
1521 | rdev->badblocks.shift = 0; | |
2699b672 | 1522 | |
9a7b2b0f | 1523 | if (!refdev) { |
8ed75463 | 1524 | ret = 1; |
9a7b2b0f | 1525 | } else { |
1da177e4 | 1526 | __u64 ev1, ev2; |
65a06f06 | 1527 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1528 | |
1529 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1530 | sb->level != refsb->level || | |
1531 | sb->layout != refsb->layout || | |
1532 | sb->chunksize != refsb->chunksize) { | |
1533 | printk(KERN_WARNING "md: %s has strangely different" | |
1534 | " superblock to %s\n", | |
1535 | bdevname(rdev->bdev,b), | |
1536 | bdevname(refdev->bdev,b2)); | |
1537 | return -EINVAL; | |
1538 | } | |
1539 | ev1 = le64_to_cpu(sb->events); | |
1540 | ev2 = le64_to_cpu(refsb->events); | |
1541 | ||
1542 | if (ev1 > ev2) | |
8ed75463 N |
1543 | ret = 1; |
1544 | else | |
1545 | ret = 0; | |
1da177e4 | 1546 | } |
c6563a8c N |
1547 | if (minor_version) { |
1548 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1549 | sectors -= rdev->data_offset; | |
1550 | } else | |
1551 | sectors = rdev->sb_start; | |
1552 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1553 | return -EINVAL; |
dd8ac336 | 1554 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1555 | return ret; |
1da177e4 LT |
1556 | } |
1557 | ||
fd01b88c | 1558 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1559 | { |
65a06f06 | 1560 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1561 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1562 | |
41158c7e | 1563 | rdev->raid_disk = -1; |
c5d79adb N |
1564 | clear_bit(Faulty, &rdev->flags); |
1565 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1566 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1567 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1568 | |
1da177e4 LT |
1569 | if (mddev->raid_disks == 0) { |
1570 | mddev->major_version = 1; | |
1571 | mddev->patch_version = 0; | |
e691063a | 1572 | mddev->external = 0; |
9d8f0363 | 1573 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1574 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1575 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1576 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1577 | mddev->clevel[0] = 0; |
1da177e4 LT |
1578 | mddev->layout = le32_to_cpu(sb->layout); |
1579 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1580 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1581 | mddev->events = ev1; |
c3d9714e | 1582 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1583 | mddev->bitmap_info.space = 0; |
1584 | /* Default location for bitmap is 1K after superblock | |
1585 | * using 3K - total of 4K | |
1586 | */ | |
c3d9714e | 1587 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1588 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1589 | mddev->reshape_backwards = 0; |
1590 | ||
1da177e4 LT |
1591 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1592 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1593 | ||
1594 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1595 | |
71c0805c | 1596 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1597 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1598 | mddev->bitmap_info.offset = |
1599 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1600 | /* Metadata doesn't record how much space is available. |
1601 | * For 1.0, we assume we can use up to the superblock | |
1602 | * if before, else to 4K beyond superblock. | |
1603 | * For others, assume no change is possible. | |
1604 | */ | |
1605 | if (mddev->minor_version > 0) | |
1606 | mddev->bitmap_info.space = 0; | |
1607 | else if (mddev->bitmap_info.offset > 0) | |
1608 | mddev->bitmap_info.space = | |
1609 | 8 - mddev->bitmap_info.offset; | |
1610 | else | |
1611 | mddev->bitmap_info.space = | |
1612 | -mddev->bitmap_info.offset; | |
1613 | } | |
e11e93fa | 1614 | |
f6705578 N |
1615 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1616 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1617 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1618 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1619 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1620 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1621 | if (mddev->delta_disks < 0 || |
1622 | (mddev->delta_disks == 0 && | |
1623 | (le32_to_cpu(sb->feature_map) | |
1624 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1625 | mddev->reshape_backwards = 1; | |
f6705578 N |
1626 | } else { |
1627 | mddev->reshape_position = MaxSector; | |
1628 | mddev->delta_disks = 0; | |
1629 | mddev->new_level = mddev->level; | |
1630 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1631 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1632 | } |
1633 | ||
41158c7e | 1634 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1635 | /* Insist of good event counter while assembling, except for |
1636 | * spares (which don't need an event count) */ | |
1da177e4 | 1637 | ++ev1; |
be6800a7 N |
1638 | if (rdev->desc_nr >= 0 && |
1639 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1640 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1641 | if (ev1 < mddev->events) | |
1642 | return -EINVAL; | |
41158c7e N |
1643 | } else if (mddev->bitmap) { |
1644 | /* If adding to array with a bitmap, then we can accept an | |
1645 | * older device, but not too old. | |
1646 | */ | |
41158c7e N |
1647 | if (ev1 < mddev->bitmap->events_cleared) |
1648 | return 0; | |
8313b8e5 N |
1649 | if (ev1 < mddev->events) |
1650 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1651 | } else { |
1652 | if (ev1 < mddev->events) | |
1653 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1654 | return 0; | |
1655 | } | |
1da177e4 LT |
1656 | if (mddev->level != LEVEL_MULTIPATH) { |
1657 | int role; | |
3673f305 N |
1658 | if (rdev->desc_nr < 0 || |
1659 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1660 | role = 0xffff; | |
1661 | rdev->desc_nr = -1; | |
1662 | } else | |
1663 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1664 | switch(role) { |
1665 | case 0xffff: /* spare */ | |
1da177e4 LT |
1666 | break; |
1667 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1668 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1669 | break; |
1670 | default: | |
f466722c | 1671 | rdev->saved_raid_disk = role; |
5fd6c1dc | 1672 | if ((le32_to_cpu(sb->feature_map) & |
f466722c | 1673 | MD_FEATURE_RECOVERY_OFFSET)) { |
5fd6c1dc | 1674 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
f466722c N |
1675 | if (!(le32_to_cpu(sb->feature_map) & |
1676 | MD_FEATURE_RECOVERY_BITMAP)) | |
1677 | rdev->saved_raid_disk = -1; | |
1678 | } else | |
5fd6c1dc | 1679 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1680 | rdev->raid_disk = role; |
1681 | break; | |
1682 | } | |
8ddf9efe N |
1683 | if (sb->devflags & WriteMostly1) |
1684 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1685 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1686 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1687 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1688 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1689 | |
1da177e4 LT |
1690 | return 0; |
1691 | } | |
1692 | ||
fd01b88c | 1693 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1694 | { |
1695 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1696 | struct md_rdev *rdev2; |
1da177e4 LT |
1697 | int max_dev, i; |
1698 | /* make rdev->sb match mddev and rdev data. */ | |
1699 | ||
65a06f06 | 1700 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1701 | |
1702 | sb->feature_map = 0; | |
1703 | sb->pad0 = 0; | |
5fd6c1dc | 1704 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1705 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1706 | ||
1707 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1708 | sb->events = cpu_to_le64(mddev->events); | |
1709 | if (mddev->in_sync) | |
1710 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1711 | else | |
1712 | sb->resync_offset = cpu_to_le64(0); | |
1713 | ||
1c05b4bc | 1714 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1715 | |
f0ca340c | 1716 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1717 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1718 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1719 | sb->level = cpu_to_le32(mddev->level); |
1720 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1721 | |
aeb9b211 N |
1722 | if (test_bit(WriteMostly, &rdev->flags)) |
1723 | sb->devflags |= WriteMostly1; | |
1724 | else | |
1725 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1726 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1727 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1728 | |
c3d9714e N |
1729 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1730 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1731 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1732 | } |
5fd6c1dc N |
1733 | |
1734 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1735 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1736 | sb->feature_map |= |
1737 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1738 | sb->recovery_offset = | |
1739 | cpu_to_le64(rdev->recovery_offset); | |
f466722c N |
1740 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
1741 | sb->feature_map |= | |
1742 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); | |
5fd6c1dc | 1743 | } |
2d78f8c4 N |
1744 | if (test_bit(Replacement, &rdev->flags)) |
1745 | sb->feature_map |= | |
1746 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1747 | |
f6705578 N |
1748 | if (mddev->reshape_position != MaxSector) { |
1749 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1750 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1751 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1752 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1753 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1754 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1755 | if (mddev->delta_disks == 0 && |
1756 | mddev->reshape_backwards) | |
1757 | sb->feature_map | |
1758 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1759 | if (rdev->new_data_offset != rdev->data_offset) { |
1760 | sb->feature_map | |
1761 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1762 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1763 | - rdev->data_offset)); | |
1764 | } | |
f6705578 | 1765 | } |
a654b9d8 | 1766 | |
2699b672 N |
1767 | if (rdev->badblocks.count == 0) |
1768 | /* Nothing to do for bad blocks*/ ; | |
1769 | else if (sb->bblog_offset == 0) | |
1770 | /* Cannot record bad blocks on this device */ | |
1771 | md_error(mddev, rdev); | |
1772 | else { | |
1773 | struct badblocks *bb = &rdev->badblocks; | |
1774 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1775 | u64 *p = bb->page; | |
1776 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1777 | if (bb->changed) { | |
1778 | unsigned seq; | |
1779 | ||
1780 | retry: | |
1781 | seq = read_seqbegin(&bb->lock); | |
1782 | ||
1783 | memset(bbp, 0xff, PAGE_SIZE); | |
1784 | ||
1785 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1786 | u64 internal_bb = p[i]; |
2699b672 N |
1787 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1788 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1789 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1790 | } |
d0962936 | 1791 | bb->changed = 0; |
2699b672 N |
1792 | if (read_seqretry(&bb->lock, seq)) |
1793 | goto retry; | |
1794 | ||
1795 | bb->sector = (rdev->sb_start + | |
1796 | (int)le32_to_cpu(sb->bblog_offset)); | |
1797 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1798 | } |
1799 | } | |
1800 | ||
1da177e4 | 1801 | max_dev = 0; |
dafb20fa | 1802 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1803 | if (rdev2->desc_nr+1 > max_dev) |
1804 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1805 | |
70471daf N |
1806 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1807 | int bmask; | |
a778b73f | 1808 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1809 | rdev->sb_size = max_dev * 2 + 256; |
1810 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1811 | if (rdev->sb_size & bmask) | |
1812 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1813 | } else |
1814 | max_dev = le32_to_cpu(sb->max_dev); | |
1815 | ||
1da177e4 LT |
1816 | for (i=0; i<max_dev;i++) |
1817 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
f72ffdd6 | 1818 | |
dafb20fa | 1819 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1820 | i = rdev2->desc_nr; |
b2d444d7 | 1821 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1822 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1823 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1824 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1825 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1826 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1827 | else |
1828 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1829 | } | |
1830 | ||
1da177e4 LT |
1831 | sb->sb_csum = calc_sb_1_csum(sb); |
1832 | } | |
1833 | ||
0cd17fec | 1834 | static unsigned long long |
3cb03002 | 1835 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1836 | { |
1837 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1838 | sector_t max_sectors; |
58c0fed4 | 1839 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1840 | return 0; /* component must fit device */ |
c6563a8c N |
1841 | if (rdev->data_offset != rdev->new_data_offset) |
1842 | return 0; /* too confusing */ | |
0f420358 | 1843 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1844 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1845 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1846 | max_sectors -= rdev->data_offset; |
1847 | if (!num_sectors || num_sectors > max_sectors) | |
1848 | num_sectors = max_sectors; | |
c3d9714e | 1849 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1850 | /* minor version 0 with bitmap we can't move */ |
1851 | return 0; | |
1852 | } else { | |
1853 | /* minor version 0; superblock after data */ | |
0f420358 | 1854 | sector_t sb_start; |
77304d2a | 1855 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1856 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1857 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1858 | if (!num_sectors || num_sectors > max_sectors) |
1859 | num_sectors = max_sectors; | |
0f420358 | 1860 | rdev->sb_start = sb_start; |
0cd17fec | 1861 | } |
65a06f06 | 1862 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1863 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1864 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1865 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1866 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1867 | rdev->sb_page); |
1868 | md_super_wait(rdev->mddev); | |
c26a44ed | 1869 | return num_sectors; |
c6563a8c N |
1870 | |
1871 | } | |
1872 | ||
1873 | static int | |
1874 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1875 | unsigned long long new_offset) | |
1876 | { | |
1877 | /* All necessary checks on new >= old have been done */ | |
1878 | struct bitmap *bitmap; | |
1879 | if (new_offset >= rdev->data_offset) | |
1880 | return 1; | |
1881 | ||
1882 | /* with 1.0 metadata, there is no metadata to tread on | |
1883 | * so we can always move back */ | |
1884 | if (rdev->mddev->minor_version == 0) | |
1885 | return 1; | |
1886 | ||
1887 | /* otherwise we must be sure not to step on | |
1888 | * any metadata, so stay: | |
1889 | * 36K beyond start of superblock | |
1890 | * beyond end of badblocks | |
1891 | * beyond write-intent bitmap | |
1892 | */ | |
1893 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1894 | return 0; | |
1895 | bitmap = rdev->mddev->bitmap; | |
1896 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1897 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 1898 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
1899 | return 0; |
1900 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1901 | return 0; | |
1902 | ||
1903 | return 1; | |
0cd17fec | 1904 | } |
1da177e4 | 1905 | |
75c96f85 | 1906 | static struct super_type super_types[] = { |
1da177e4 LT |
1907 | [0] = { |
1908 | .name = "0.90.0", | |
1909 | .owner = THIS_MODULE, | |
0cd17fec CW |
1910 | .load_super = super_90_load, |
1911 | .validate_super = super_90_validate, | |
1912 | .sync_super = super_90_sync, | |
1913 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1914 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1915 | }, |
1916 | [1] = { | |
1917 | .name = "md-1", | |
1918 | .owner = THIS_MODULE, | |
0cd17fec CW |
1919 | .load_super = super_1_load, |
1920 | .validate_super = super_1_validate, | |
1921 | .sync_super = super_1_sync, | |
1922 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1923 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1924 | }, |
1925 | }; | |
1da177e4 | 1926 | |
fd01b88c | 1927 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1928 | { |
1929 | if (mddev->sync_super) { | |
1930 | mddev->sync_super(mddev, rdev); | |
1931 | return; | |
1932 | } | |
1933 | ||
1934 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1935 | ||
1936 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1937 | } | |
1938 | ||
fd01b88c | 1939 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1940 | { |
3cb03002 | 1941 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1942 | |
4b80991c N |
1943 | rcu_read_lock(); |
1944 | rdev_for_each_rcu(rdev, mddev1) | |
1945 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1946 | if (rdev->bdev->bd_contains == |
4b80991c N |
1947 | rdev2->bdev->bd_contains) { |
1948 | rcu_read_unlock(); | |
7dd5e7c3 | 1949 | return 1; |
4b80991c N |
1950 | } |
1951 | rcu_read_unlock(); | |
1da177e4 LT |
1952 | return 0; |
1953 | } | |
1954 | ||
1955 | static LIST_HEAD(pending_raid_disks); | |
1956 | ||
ac5e7113 AN |
1957 | /* |
1958 | * Try to register data integrity profile for an mddev | |
1959 | * | |
1960 | * This is called when an array is started and after a disk has been kicked | |
1961 | * from the array. It only succeeds if all working and active component devices | |
1962 | * are integrity capable with matching profiles. | |
1963 | */ | |
fd01b88c | 1964 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1965 | { |
3cb03002 | 1966 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1967 | |
1968 | if (list_empty(&mddev->disks)) | |
1969 | return 0; /* nothing to do */ | |
629acb6a JB |
1970 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1971 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 1972 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
1973 | /* skip spares and non-functional disks */ |
1974 | if (test_bit(Faulty, &rdev->flags)) | |
1975 | continue; | |
1976 | if (rdev->raid_disk < 0) | |
1977 | continue; | |
ac5e7113 AN |
1978 | if (!reference) { |
1979 | /* Use the first rdev as the reference */ | |
1980 | reference = rdev; | |
1981 | continue; | |
1982 | } | |
1983 | /* does this rdev's profile match the reference profile? */ | |
1984 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1985 | rdev->bdev->bd_disk) < 0) | |
1986 | return -EINVAL; | |
1987 | } | |
89078d57 MP |
1988 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1989 | return 0; | |
ac5e7113 AN |
1990 | /* |
1991 | * All component devices are integrity capable and have matching | |
1992 | * profiles, register the common profile for the md device. | |
1993 | */ | |
1994 | if (blk_integrity_register(mddev->gendisk, | |
1995 | bdev_get_integrity(reference->bdev)) != 0) { | |
1996 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1997 | mdname(mddev)); | |
1998 | return -EINVAL; | |
1999 | } | |
a91a2785 MP |
2000 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
2001 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
2002 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
2003 | mdname(mddev)); | |
2004 | return -EINVAL; | |
2005 | } | |
ac5e7113 AN |
2006 | return 0; |
2007 | } | |
2008 | EXPORT_SYMBOL(md_integrity_register); | |
2009 | ||
2010 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 2011 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 2012 | { |
2863b9eb JB |
2013 | struct blk_integrity *bi_rdev; |
2014 | struct blk_integrity *bi_mddev; | |
2015 | ||
2016 | if (!mddev->gendisk) | |
2017 | return; | |
2018 | ||
2019 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
2020 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 2021 | |
ac5e7113 | 2022 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 2023 | return; |
ac5e7113 | 2024 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 2025 | return; |
ac5e7113 AN |
2026 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2027 | rdev->bdev->bd_disk) >= 0) | |
2028 | return; | |
2029 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2030 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2031 | } |
ac5e7113 | 2032 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2033 | |
f72ffdd6 | 2034 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 2035 | { |
7dd5e7c3 | 2036 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2037 | struct kobject *ko; |
1edf80d3 | 2038 | char *s; |
5e55e2f5 | 2039 | int err; |
1da177e4 | 2040 | |
11e2ede0 DW |
2041 | /* prevent duplicates */ |
2042 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2043 | return -EEXIST; | |
2044 | ||
dd8ac336 AN |
2045 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2046 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2047 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2048 | if (mddev->pers) { |
2049 | /* Cannot change size, so fail | |
2050 | * If mddev->level <= 0, then we don't care | |
2051 | * about aligning sizes (e.g. linear) | |
2052 | */ | |
2053 | if (mddev->level > 0) | |
2054 | return -ENOSPC; | |
2055 | } else | |
dd8ac336 | 2056 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2057 | } |
1da177e4 LT |
2058 | |
2059 | /* Verify rdev->desc_nr is unique. | |
2060 | * If it is -1, assign a free number, else | |
2061 | * check number is not in use | |
2062 | */ | |
4878e9eb | 2063 | rcu_read_lock(); |
1da177e4 LT |
2064 | if (rdev->desc_nr < 0) { |
2065 | int choice = 0; | |
4878e9eb N |
2066 | if (mddev->pers) |
2067 | choice = mddev->raid_disks; | |
2068 | while (find_rdev_nr_rcu(mddev, choice)) | |
1da177e4 LT |
2069 | choice++; |
2070 | rdev->desc_nr = choice; | |
2071 | } else { | |
4878e9eb N |
2072 | if (find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
2073 | rcu_read_unlock(); | |
1da177e4 | 2074 | return -EBUSY; |
4878e9eb | 2075 | } |
1da177e4 | 2076 | } |
4878e9eb | 2077 | rcu_read_unlock(); |
de01dfad N |
2078 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2079 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2080 | mdname(mddev), mddev->max_disks); | |
2081 | return -EBUSY; | |
2082 | } | |
19133a42 | 2083 | bdevname(rdev->bdev,b); |
649316b2 | 2084 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2085 | *s = '!'; |
649316b2 | 2086 | |
1da177e4 | 2087 | rdev->mddev = mddev; |
19133a42 | 2088 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2089 | |
b2d6db58 | 2090 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2091 | goto fail; |
86e6ffdd | 2092 | |
0762b8bd | 2093 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2094 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2095 | /* failure here is OK */; | |
2096 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2097 | |
4b80991c | 2098 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2099 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2100 | |
2101 | /* May as well allow recovery to be retried once */ | |
5389042f | 2102 | mddev->recovery_disabled++; |
3f9d99c1 | 2103 | |
1da177e4 | 2104 | return 0; |
5e55e2f5 N |
2105 | |
2106 | fail: | |
2107 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2108 | b, mdname(mddev)); | |
2109 | return err; | |
1da177e4 LT |
2110 | } |
2111 | ||
177a99b2 | 2112 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2113 | { |
3cb03002 | 2114 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2115 | kobject_del(&rdev->kobj); |
177a99b2 | 2116 | kobject_put(&rdev->kobj); |
5792a285 N |
2117 | } |
2118 | ||
f72ffdd6 | 2119 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2120 | { |
2121 | char b[BDEVNAME_SIZE]; | |
403df478 | 2122 | |
49731baa | 2123 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2124 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2125 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2126 | rdev->mddev = NULL; | |
86e6ffdd | 2127 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2128 | sysfs_put(rdev->sysfs_state); |
2129 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2130 | rdev->badblocks.count = 0; |
5792a285 | 2131 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2132 | * writing to 'remove' to "dev/state". We also need |
2133 | * to delay it due to rcu usage. | |
5792a285 | 2134 | */ |
4b80991c | 2135 | synchronize_rcu(); |
177a99b2 N |
2136 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2137 | kobject_get(&rdev->kobj); | |
e804ac78 | 2138 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2139 | } |
2140 | ||
2141 | /* | |
2142 | * prevent the device from being mounted, repartitioned or | |
2143 | * otherwise reused by a RAID array (or any other kernel | |
2144 | * subsystem), by bd_claiming the device. | |
2145 | */ | |
3cb03002 | 2146 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2147 | { |
2148 | int err = 0; | |
2149 | struct block_device *bdev; | |
2150 | char b[BDEVNAME_SIZE]; | |
2151 | ||
d4d77629 | 2152 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2153 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2154 | if (IS_ERR(bdev)) { |
2155 | printk(KERN_ERR "md: could not open %s.\n", | |
2156 | __bdevname(dev, b)); | |
2157 | return PTR_ERR(bdev); | |
2158 | } | |
1da177e4 LT |
2159 | rdev->bdev = bdev; |
2160 | return err; | |
2161 | } | |
2162 | ||
3cb03002 | 2163 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2164 | { |
2165 | struct block_device *bdev = rdev->bdev; | |
2166 | rdev->bdev = NULL; | |
e525fd89 | 2167 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2168 | } |
2169 | ||
2170 | void md_autodetect_dev(dev_t dev); | |
2171 | ||
f72ffdd6 | 2172 | static void export_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2173 | { |
2174 | char b[BDEVNAME_SIZE]; | |
403df478 | 2175 | |
1da177e4 LT |
2176 | printk(KERN_INFO "md: export_rdev(%s)\n", |
2177 | bdevname(rdev->bdev,b)); | |
545c8795 | 2178 | md_rdev_clear(rdev); |
1da177e4 | 2179 | #ifndef MODULE |
d0fae18f N |
2180 | if (test_bit(AutoDetected, &rdev->flags)) |
2181 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2182 | #endif |
2183 | unlock_rdev(rdev); | |
86e6ffdd | 2184 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2185 | } |
2186 | ||
f72ffdd6 | 2187 | static void kick_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2188 | { |
2189 | unbind_rdev_from_array(rdev); | |
2190 | export_rdev(rdev); | |
2191 | } | |
2192 | ||
fd01b88c | 2193 | static void export_array(struct mddev *mddev) |
1da177e4 | 2194 | { |
0638bb0e | 2195 | struct md_rdev *rdev; |
1da177e4 | 2196 | |
0638bb0e N |
2197 | while (!list_empty(&mddev->disks)) { |
2198 | rdev = list_first_entry(&mddev->disks, struct md_rdev, | |
2199 | same_set); | |
1da177e4 LT |
2200 | kick_rdev_from_array(rdev); |
2201 | } | |
1da177e4 LT |
2202 | mddev->raid_disks = 0; |
2203 | mddev->major_version = 0; | |
2204 | } | |
2205 | ||
f72ffdd6 | 2206 | static void sync_sbs(struct mddev *mddev, int nospares) |
1da177e4 | 2207 | { |
42543769 N |
2208 | /* Update each superblock (in-memory image), but |
2209 | * if we are allowed to, skip spares which already | |
2210 | * have the right event counter, or have one earlier | |
2211 | * (which would mean they aren't being marked as dirty | |
2212 | * with the rest of the array) | |
2213 | */ | |
3cb03002 | 2214 | struct md_rdev *rdev; |
dafb20fa | 2215 | rdev_for_each(rdev, mddev) { |
42543769 N |
2216 | if (rdev->sb_events == mddev->events || |
2217 | (nospares && | |
2218 | rdev->raid_disk < 0 && | |
42543769 N |
2219 | rdev->sb_events+1 == mddev->events)) { |
2220 | /* Don't update this superblock */ | |
2221 | rdev->sb_loaded = 2; | |
2222 | } else { | |
076f968b | 2223 | sync_super(mddev, rdev); |
42543769 N |
2224 | rdev->sb_loaded = 1; |
2225 | } | |
1da177e4 LT |
2226 | } |
2227 | } | |
2228 | ||
f72ffdd6 | 2229 | static void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2230 | { |
3cb03002 | 2231 | struct md_rdev *rdev; |
06d91a5f | 2232 | int sync_req; |
42543769 | 2233 | int nospares = 0; |
2699b672 | 2234 | int any_badblocks_changed = 0; |
1da177e4 | 2235 | |
d87f064f N |
2236 | if (mddev->ro) { |
2237 | if (force_change) | |
2238 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2239 | return; | |
2240 | } | |
1da177e4 | 2241 | repeat: |
3a3a5ddb | 2242 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2243 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2244 | if (rdev->raid_disk >= 0 && |
2245 | mddev->delta_disks >= 0 && | |
2246 | !test_bit(In_sync, &rdev->flags) && | |
2247 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2248 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2249 | ||
f72ffdd6 | 2250 | } |
bd52b746 | 2251 | if (!mddev->persistent) { |
070dc6dd | 2252 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2253 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2254 | if (!mddev->external) { |
d97a41dc | 2255 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2256 | rdev_for_each(rdev, mddev) { |
de393cde | 2257 | if (rdev->badblocks.changed) { |
d0962936 | 2258 | rdev->badblocks.changed = 0; |
de393cde N |
2259 | md_ack_all_badblocks(&rdev->badblocks); |
2260 | md_error(mddev, rdev); | |
2261 | } | |
2262 | clear_bit(Blocked, &rdev->flags); | |
2263 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2264 | wake_up(&rdev->blocked_wait); | |
2265 | } | |
2266 | } | |
3a3a5ddb N |
2267 | wake_up(&mddev->sb_wait); |
2268 | return; | |
2269 | } | |
2270 | ||
85572d7c | 2271 | spin_lock(&mddev->lock); |
84692195 | 2272 | |
3a3a5ddb N |
2273 | mddev->utime = get_seconds(); |
2274 | ||
850b2b42 N |
2275 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2276 | force_change = 1; | |
2277 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2278 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2279 | * though if events isn't the right even/odd, we will have to do | |
2280 | * spares after all | |
2281 | */ | |
2282 | nospares = 1; | |
2283 | if (force_change) | |
2284 | nospares = 0; | |
2285 | if (mddev->degraded) | |
84692195 N |
2286 | /* If the array is degraded, then skipping spares is both |
2287 | * dangerous and fairly pointless. | |
2288 | * Dangerous because a device that was removed from the array | |
2289 | * might have a event_count that still looks up-to-date, | |
2290 | * so it can be re-added without a resync. | |
2291 | * Pointless because if there are any spares to skip, | |
2292 | * then a recovery will happen and soon that array won't | |
2293 | * be degraded any more and the spare can go back to sleep then. | |
2294 | */ | |
850b2b42 | 2295 | nospares = 0; |
84692195 | 2296 | |
06d91a5f | 2297 | sync_req = mddev->in_sync; |
42543769 N |
2298 | |
2299 | /* If this is just a dirty<->clean transition, and the array is clean | |
2300 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2301 | if (nospares |
42543769 | 2302 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2303 | && mddev->can_decrease_events |
2304 | && mddev->events != 1) { | |
42543769 | 2305 | mddev->events--; |
a8707c08 N |
2306 | mddev->can_decrease_events = 0; |
2307 | } else { | |
42543769 N |
2308 | /* otherwise we have to go forward and ... */ |
2309 | mddev->events ++; | |
a8707c08 | 2310 | mddev->can_decrease_events = nospares; |
42543769 | 2311 | } |
1da177e4 | 2312 | |
403df478 N |
2313 | /* |
2314 | * This 64-bit counter should never wrap. | |
2315 | * Either we are in around ~1 trillion A.C., assuming | |
2316 | * 1 reboot per second, or we have a bug... | |
2317 | */ | |
2318 | WARN_ON(mddev->events == 0); | |
2699b672 | 2319 | |
dafb20fa | 2320 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2321 | if (rdev->badblocks.changed) |
2322 | any_badblocks_changed++; | |
de393cde N |
2323 | if (test_bit(Faulty, &rdev->flags)) |
2324 | set_bit(FaultRecorded, &rdev->flags); | |
2325 | } | |
2699b672 | 2326 | |
e691063a | 2327 | sync_sbs(mddev, nospares); |
85572d7c | 2328 | spin_unlock(&mddev->lock); |
1da177e4 | 2329 | |
36a4e1fe N |
2330 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2331 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2332 | |
4ad13663 | 2333 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2334 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2335 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2336 | |
42543769 N |
2337 | if (rdev->sb_loaded != 1) |
2338 | continue; /* no noise on spare devices */ | |
1da177e4 | 2339 | |
f466722c | 2340 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2341 | md_super_write(mddev,rdev, |
0f420358 | 2342 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2343 | rdev->sb_page); |
36a4e1fe N |
2344 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2345 | bdevname(rdev->bdev, b), | |
2346 | (unsigned long long)rdev->sb_start); | |
42543769 | 2347 | rdev->sb_events = mddev->events; |
2699b672 N |
2348 | if (rdev->badblocks.size) { |
2349 | md_super_write(mddev, rdev, | |
2350 | rdev->badblocks.sector, | |
2351 | rdev->badblocks.size << 9, | |
2352 | rdev->bb_page); | |
2353 | rdev->badblocks.size = 0; | |
2354 | } | |
7bfa19f2 | 2355 | |
f466722c | 2356 | } else |
36a4e1fe N |
2357 | pr_debug("md: %s (skipping faulty)\n", |
2358 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2359 | |
7bfa19f2 | 2360 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2361 | /* only need to write one superblock... */ |
2362 | break; | |
2363 | } | |
a9701a30 | 2364 | md_super_wait(mddev); |
850b2b42 | 2365 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2366 | |
85572d7c | 2367 | spin_lock(&mddev->lock); |
850b2b42 N |
2368 | if (mddev->in_sync != sync_req || |
2369 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2370 | /* have to write it out again */ |
85572d7c | 2371 | spin_unlock(&mddev->lock); |
06d91a5f N |
2372 | goto repeat; |
2373 | } | |
850b2b42 | 2374 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
85572d7c | 2375 | spin_unlock(&mddev->lock); |
3d310eb7 | 2376 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2377 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2378 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2379 | |
dafb20fa | 2380 | rdev_for_each(rdev, mddev) { |
de393cde N |
2381 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2382 | clear_bit(Blocked, &rdev->flags); | |
2383 | ||
2384 | if (any_badblocks_changed) | |
2699b672 | 2385 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2386 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2387 | wake_up(&rdev->blocked_wait); | |
2388 | } | |
1da177e4 LT |
2389 | } |
2390 | ||
7f6ce769 | 2391 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2392 | * We want to accept with case. For this we use cmd_match. |
2393 | */ | |
2394 | static int cmd_match(const char *cmd, const char *str) | |
2395 | { | |
2396 | /* See if cmd, written into a sysfs file, matches | |
2397 | * str. They must either be the same, or cmd can | |
2398 | * have a trailing newline | |
2399 | */ | |
2400 | while (*cmd && *str && *cmd == *str) { | |
2401 | cmd++; | |
2402 | str++; | |
2403 | } | |
2404 | if (*cmd == '\n') | |
2405 | cmd++; | |
2406 | if (*str || *cmd) | |
2407 | return 0; | |
2408 | return 1; | |
2409 | } | |
2410 | ||
86e6ffdd N |
2411 | struct rdev_sysfs_entry { |
2412 | struct attribute attr; | |
3cb03002 N |
2413 | ssize_t (*show)(struct md_rdev *, char *); |
2414 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2415 | }; |
2416 | ||
2417 | static ssize_t | |
3cb03002 | 2418 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2419 | { |
2420 | char *sep = ""; | |
20a49ff6 | 2421 | size_t len = 0; |
758bfc8a | 2422 | unsigned long flags = ACCESS_ONCE(rdev->flags); |
86e6ffdd | 2423 | |
758bfc8a | 2424 | if (test_bit(Faulty, &flags) || |
de393cde | 2425 | rdev->badblocks.unacked_exist) { |
86e6ffdd N |
2426 | len+= sprintf(page+len, "%sfaulty",sep); |
2427 | sep = ","; | |
2428 | } | |
758bfc8a | 2429 | if (test_bit(In_sync, &flags)) { |
86e6ffdd N |
2430 | len += sprintf(page+len, "%sin_sync",sep); |
2431 | sep = ","; | |
2432 | } | |
758bfc8a | 2433 | if (test_bit(WriteMostly, &flags)) { |
f655675b N |
2434 | len += sprintf(page+len, "%swrite_mostly",sep); |
2435 | sep = ","; | |
2436 | } | |
758bfc8a | 2437 | if (test_bit(Blocked, &flags) || |
52c64152 | 2438 | (rdev->badblocks.unacked_exist |
758bfc8a | 2439 | && !test_bit(Faulty, &flags))) { |
6bfe0b49 DW |
2440 | len += sprintf(page+len, "%sblocked", sep); |
2441 | sep = ","; | |
2442 | } | |
758bfc8a N |
2443 | if (!test_bit(Faulty, &flags) && |
2444 | !test_bit(In_sync, &flags)) { | |
86e6ffdd N |
2445 | len += sprintf(page+len, "%sspare", sep); |
2446 | sep = ","; | |
2447 | } | |
758bfc8a | 2448 | if (test_bit(WriteErrorSeen, &flags)) { |
d7a9d443 N |
2449 | len += sprintf(page+len, "%swrite_error", sep); |
2450 | sep = ","; | |
2451 | } | |
758bfc8a | 2452 | if (test_bit(WantReplacement, &flags)) { |
2d78f8c4 N |
2453 | len += sprintf(page+len, "%swant_replacement", sep); |
2454 | sep = ","; | |
2455 | } | |
758bfc8a | 2456 | if (test_bit(Replacement, &flags)) { |
2d78f8c4 N |
2457 | len += sprintf(page+len, "%sreplacement", sep); |
2458 | sep = ","; | |
2459 | } | |
2460 | ||
86e6ffdd N |
2461 | return len+sprintf(page+len, "\n"); |
2462 | } | |
2463 | ||
45dc2de1 | 2464 | static ssize_t |
3cb03002 | 2465 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2466 | { |
2467 | /* can write | |
de393cde | 2468 | * faulty - simulates an error |
45dc2de1 | 2469 | * remove - disconnects the device |
f655675b N |
2470 | * writemostly - sets write_mostly |
2471 | * -writemostly - clears write_mostly | |
de393cde N |
2472 | * blocked - sets the Blocked flags |
2473 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2474 | * insync - sets Insync providing device isn't active |
f466722c N |
2475 | * -insync - clear Insync for a device with a slot assigned, |
2476 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2477 | * write_error - sets WriteErrorSeen |
2478 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2479 | */ |
2480 | int err = -EINVAL; | |
2481 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2482 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2483 | if (test_bit(Faulty, &rdev->flags)) |
2484 | err = 0; | |
2485 | else | |
2486 | err = -EBUSY; | |
45dc2de1 N |
2487 | } else if (cmd_match(buf, "remove")) { |
2488 | if (rdev->raid_disk >= 0) | |
2489 | err = -EBUSY; | |
2490 | else { | |
fd01b88c | 2491 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2492 | kick_rdev_from_array(rdev); |
3f9d7b0d N |
2493 | if (mddev->pers) |
2494 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2495 | md_new_event(mddev); |
2496 | err = 0; | |
2497 | } | |
f655675b N |
2498 | } else if (cmd_match(buf, "writemostly")) { |
2499 | set_bit(WriteMostly, &rdev->flags); | |
2500 | err = 0; | |
2501 | } else if (cmd_match(buf, "-writemostly")) { | |
2502 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2503 | err = 0; |
2504 | } else if (cmd_match(buf, "blocked")) { | |
2505 | set_bit(Blocked, &rdev->flags); | |
2506 | err = 0; | |
2507 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2508 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2509 | rdev->badblocks.unacked_exist) { |
de393cde N |
2510 | /* metadata handler doesn't understand badblocks, |
2511 | * so we need to fail the device | |
2512 | */ | |
2513 | md_error(rdev->mddev, rdev); | |
2514 | } | |
6bfe0b49 | 2515 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2516 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2517 | wake_up(&rdev->blocked_wait); |
2518 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2519 | md_wakeup_thread(rdev->mddev->thread); | |
2520 | ||
6d56e278 N |
2521 | err = 0; |
2522 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2523 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2524 | err = 0; |
f466722c | 2525 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) { |
e1960f8c N |
2526 | if (rdev->mddev->pers == NULL) { |
2527 | clear_bit(In_sync, &rdev->flags); | |
2528 | rdev->saved_raid_disk = rdev->raid_disk; | |
2529 | rdev->raid_disk = -1; | |
2530 | err = 0; | |
2531 | } | |
d7a9d443 N |
2532 | } else if (cmd_match(buf, "write_error")) { |
2533 | set_bit(WriteErrorSeen, &rdev->flags); | |
2534 | err = 0; | |
2535 | } else if (cmd_match(buf, "-write_error")) { | |
2536 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2537 | err = 0; | |
2d78f8c4 N |
2538 | } else if (cmd_match(buf, "want_replacement")) { |
2539 | /* Any non-spare device that is not a replacement can | |
2540 | * become want_replacement at any time, but we then need to | |
2541 | * check if recovery is needed. | |
2542 | */ | |
2543 | if (rdev->raid_disk >= 0 && | |
2544 | !test_bit(Replacement, &rdev->flags)) | |
2545 | set_bit(WantReplacement, &rdev->flags); | |
2546 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2547 | md_wakeup_thread(rdev->mddev->thread); | |
2548 | err = 0; | |
2549 | } else if (cmd_match(buf, "-want_replacement")) { | |
2550 | /* Clearing 'want_replacement' is always allowed. | |
2551 | * Once replacements starts it is too late though. | |
2552 | */ | |
2553 | err = 0; | |
2554 | clear_bit(WantReplacement, &rdev->flags); | |
2555 | } else if (cmd_match(buf, "replacement")) { | |
2556 | /* Can only set a device as a replacement when array has not | |
2557 | * yet been started. Once running, replacement is automatic | |
2558 | * from spares, or by assigning 'slot'. | |
2559 | */ | |
2560 | if (rdev->mddev->pers) | |
2561 | err = -EBUSY; | |
2562 | else { | |
2563 | set_bit(Replacement, &rdev->flags); | |
2564 | err = 0; | |
2565 | } | |
2566 | } else if (cmd_match(buf, "-replacement")) { | |
2567 | /* Similarly, can only clear Replacement before start */ | |
2568 | if (rdev->mddev->pers) | |
2569 | err = -EBUSY; | |
2570 | else { | |
2571 | clear_bit(Replacement, &rdev->flags); | |
2572 | err = 0; | |
2573 | } | |
45dc2de1 | 2574 | } |
00bcb4ac N |
2575 | if (!err) |
2576 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2577 | return err ? err : len; |
2578 | } | |
80ca3a44 N |
2579 | static struct rdev_sysfs_entry rdev_state = |
2580 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2581 | |
4dbcdc75 | 2582 | static ssize_t |
3cb03002 | 2583 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2584 | { |
2585 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2586 | } | |
2587 | ||
2588 | static ssize_t | |
3cb03002 | 2589 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 N |
2590 | { |
2591 | char *e; | |
2592 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2593 | if (*buf && (*e == 0 || *e == '\n')) { | |
2594 | atomic_set(&rdev->corrected_errors, n); | |
2595 | return len; | |
2596 | } | |
2597 | return -EINVAL; | |
2598 | } | |
2599 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2600 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2601 | |
014236d2 | 2602 | static ssize_t |
3cb03002 | 2603 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2604 | { |
2605 | if (rdev->raid_disk < 0) | |
2606 | return sprintf(page, "none\n"); | |
2607 | else | |
2608 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2609 | } | |
2610 | ||
2611 | static ssize_t | |
3cb03002 | 2612 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 N |
2613 | { |
2614 | char *e; | |
c303da6d | 2615 | int err; |
014236d2 N |
2616 | int slot = simple_strtoul(buf, &e, 10); |
2617 | if (strncmp(buf, "none", 4)==0) | |
2618 | slot = -1; | |
2619 | else if (e==buf || (*e && *e!= '\n')) | |
2620 | return -EINVAL; | |
6c2fce2e | 2621 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2622 | /* Setting 'slot' on an active array requires also |
2623 | * updating the 'rd%d' link, and communicating | |
2624 | * with the personality with ->hot_*_disk. | |
2625 | * For now we only support removing | |
2626 | * failed/spare devices. This normally happens automatically, | |
2627 | * but not when the metadata is externally managed. | |
2628 | */ | |
c303da6d N |
2629 | if (rdev->raid_disk == -1) |
2630 | return -EEXIST; | |
2631 | /* personality does all needed checks */ | |
01393f3d | 2632 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2633 | return -EINVAL; |
746d3207 N |
2634 | clear_bit(Blocked, &rdev->flags); |
2635 | remove_and_add_spares(rdev->mddev, rdev); | |
2636 | if (rdev->raid_disk >= 0) | |
2637 | return -EBUSY; | |
c303da6d N |
2638 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2639 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2640 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2641 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2642 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2643 | */ |
2644 | ||
2645 | if (rdev->raid_disk != -1) | |
2646 | return -EBUSY; | |
2647 | ||
c6751b2b N |
2648 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2649 | return -EBUSY; | |
2650 | ||
6c2fce2e NB |
2651 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2652 | return -EINVAL; | |
2653 | ||
ba1b41b6 N |
2654 | if (slot >= rdev->mddev->raid_disks && |
2655 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2656 | return -ENOSPC; | |
2657 | ||
6c2fce2e NB |
2658 | rdev->raid_disk = slot; |
2659 | if (test_bit(In_sync, &rdev->flags)) | |
2660 | rdev->saved_raid_disk = slot; | |
2661 | else | |
2662 | rdev->saved_raid_disk = -1; | |
d30519fc | 2663 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2664 | clear_bit(Bitmap_sync, &rdev->flags); |
6c2fce2e NB |
2665 | err = rdev->mddev->pers-> |
2666 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2667 | if (err) { |
6c2fce2e | 2668 | rdev->raid_disk = -1; |
6c2fce2e | 2669 | return err; |
52664732 | 2670 | } else |
00bcb4ac | 2671 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2672 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2673 | /* failure here is OK */; |
6c2fce2e | 2674 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2675 | } else { |
ba1b41b6 N |
2676 | if (slot >= rdev->mddev->raid_disks && |
2677 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2678 | return -ENOSPC; |
2679 | rdev->raid_disk = slot; | |
2680 | /* assume it is working */ | |
c5d79adb N |
2681 | clear_bit(Faulty, &rdev->flags); |
2682 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2683 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2684 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2685 | } |
014236d2 N |
2686 | return len; |
2687 | } | |
2688 | ||
014236d2 | 2689 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2690 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2691 | |
93c8cad0 | 2692 | static ssize_t |
3cb03002 | 2693 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2694 | { |
6961ece4 | 2695 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2696 | } |
2697 | ||
2698 | static ssize_t | |
3cb03002 | 2699 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2700 | { |
c6563a8c | 2701 | unsigned long long offset; |
b29bebd6 | 2702 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 2703 | return -EINVAL; |
8ed0a521 | 2704 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2705 | return -EBUSY; |
dd8ac336 | 2706 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2707 | /* Must set offset before size, so overlap checks |
2708 | * can be sane */ | |
2709 | return -EBUSY; | |
93c8cad0 | 2710 | rdev->data_offset = offset; |
25f7fd47 | 2711 | rdev->new_data_offset = offset; |
93c8cad0 N |
2712 | return len; |
2713 | } | |
2714 | ||
2715 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2716 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2717 | |
c6563a8c N |
2718 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2719 | { | |
2720 | return sprintf(page, "%llu\n", | |
2721 | (unsigned long long)rdev->new_data_offset); | |
2722 | } | |
2723 | ||
2724 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2725 | const char *buf, size_t len) | |
2726 | { | |
2727 | unsigned long long new_offset; | |
2728 | struct mddev *mddev = rdev->mddev; | |
2729 | ||
b29bebd6 | 2730 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
2731 | return -EINVAL; |
2732 | ||
f851b60d N |
2733 | if (mddev->sync_thread || |
2734 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
2735 | return -EBUSY; |
2736 | if (new_offset == rdev->data_offset) | |
2737 | /* reset is always permitted */ | |
2738 | ; | |
2739 | else if (new_offset > rdev->data_offset) { | |
2740 | /* must not push array size beyond rdev_sectors */ | |
2741 | if (new_offset - rdev->data_offset | |
2742 | + mddev->dev_sectors > rdev->sectors) | |
2743 | return -E2BIG; | |
2744 | } | |
2745 | /* Metadata worries about other space details. */ | |
2746 | ||
2747 | /* decreasing the offset is inconsistent with a backwards | |
2748 | * reshape. | |
2749 | */ | |
2750 | if (new_offset < rdev->data_offset && | |
2751 | mddev->reshape_backwards) | |
2752 | return -EINVAL; | |
2753 | /* Increasing offset is inconsistent with forwards | |
2754 | * reshape. reshape_direction should be set to | |
2755 | * 'backwards' first. | |
2756 | */ | |
2757 | if (new_offset > rdev->data_offset && | |
2758 | !mddev->reshape_backwards) | |
2759 | return -EINVAL; | |
2760 | ||
2761 | if (mddev->pers && mddev->persistent && | |
2762 | !super_types[mddev->major_version] | |
2763 | .allow_new_offset(rdev, new_offset)) | |
2764 | return -E2BIG; | |
2765 | rdev->new_data_offset = new_offset; | |
2766 | if (new_offset > rdev->data_offset) | |
2767 | mddev->reshape_backwards = 1; | |
2768 | else if (new_offset < rdev->data_offset) | |
2769 | mddev->reshape_backwards = 0; | |
2770 | ||
2771 | return len; | |
2772 | } | |
2773 | static struct rdev_sysfs_entry rdev_new_offset = | |
2774 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2775 | ||
83303b61 | 2776 | static ssize_t |
3cb03002 | 2777 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2778 | { |
dd8ac336 | 2779 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2780 | } |
2781 | ||
c5d79adb N |
2782 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2783 | { | |
2784 | /* check if two start/length pairs overlap */ | |
2785 | if (s1+l1 <= s2) | |
2786 | return 0; | |
2787 | if (s2+l2 <= s1) | |
2788 | return 0; | |
2789 | return 1; | |
2790 | } | |
2791 | ||
b522adcd DW |
2792 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2793 | { | |
2794 | unsigned long long blocks; | |
2795 | sector_t new; | |
2796 | ||
b29bebd6 | 2797 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
2798 | return -EINVAL; |
2799 | ||
2800 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2801 | return -EINVAL; /* sector conversion overflow */ | |
2802 | ||
2803 | new = blocks * 2; | |
2804 | if (new != blocks * 2) | |
2805 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2806 | ||
2807 | *sectors = new; | |
2808 | return 0; | |
2809 | } | |
2810 | ||
83303b61 | 2811 | static ssize_t |
3cb03002 | 2812 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2813 | { |
fd01b88c | 2814 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2815 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2816 | sector_t sectors; |
27c529bb | 2817 | |
b522adcd | 2818 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2819 | return -EINVAL; |
c6563a8c N |
2820 | if (rdev->data_offset != rdev->new_data_offset) |
2821 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2822 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2823 | if (my_mddev->persistent) { |
dd8ac336 AN |
2824 | sectors = super_types[my_mddev->major_version]. |
2825 | rdev_size_change(rdev, sectors); | |
2826 | if (!sectors) | |
0cd17fec | 2827 | return -EBUSY; |
dd8ac336 | 2828 | } else if (!sectors) |
77304d2a | 2829 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2830 | rdev->data_offset; |
a6468539 N |
2831 | if (!my_mddev->pers->resize) |
2832 | /* Cannot change size for RAID0 or Linear etc */ | |
2833 | return -EINVAL; | |
0cd17fec | 2834 | } |
dd8ac336 | 2835 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2836 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2837 | |
dd8ac336 AN |
2838 | rdev->sectors = sectors; |
2839 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
2840 | /* Need to check that all other rdevs with the same |
2841 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
2842 | * the rdev lists safely. | |
2843 | * This check does not provide a hard guarantee, it | |
2844 | * just helps avoid dangerous mistakes. | |
c5d79adb | 2845 | */ |
fd01b88c | 2846 | struct mddev *mddev; |
c5d79adb | 2847 | int overlap = 0; |
159ec1fc | 2848 | struct list_head *tmp; |
c5d79adb | 2849 | |
8b1afc3d | 2850 | rcu_read_lock(); |
29ac4aa3 | 2851 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2852 | struct md_rdev *rdev2; |
c5d79adb | 2853 | |
dafb20fa | 2854 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
2855 | if (rdev->bdev == rdev2->bdev && |
2856 | rdev != rdev2 && | |
2857 | overlaps(rdev->data_offset, rdev->sectors, | |
2858 | rdev2->data_offset, | |
2859 | rdev2->sectors)) { | |
c5d79adb N |
2860 | overlap = 1; |
2861 | break; | |
2862 | } | |
c5d79adb N |
2863 | if (overlap) { |
2864 | mddev_put(mddev); | |
2865 | break; | |
2866 | } | |
2867 | } | |
8b1afc3d | 2868 | rcu_read_unlock(); |
c5d79adb N |
2869 | if (overlap) { |
2870 | /* Someone else could have slipped in a size | |
2871 | * change here, but doing so is just silly. | |
dd8ac336 | 2872 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2873 | * safe, and trust userspace not to race with |
2874 | * itself | |
2875 | */ | |
dd8ac336 | 2876 | rdev->sectors = oldsectors; |
c5d79adb N |
2877 | return -EBUSY; |
2878 | } | |
2879 | } | |
83303b61 N |
2880 | return len; |
2881 | } | |
2882 | ||
2883 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2884 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2885 | |
3cb03002 | 2886 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
2887 | { |
2888 | unsigned long long recovery_start = rdev->recovery_offset; | |
2889 | ||
2890 | if (test_bit(In_sync, &rdev->flags) || | |
2891 | recovery_start == MaxSector) | |
2892 | return sprintf(page, "none\n"); | |
2893 | ||
2894 | return sprintf(page, "%llu\n", recovery_start); | |
2895 | } | |
2896 | ||
3cb03002 | 2897 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
2898 | { |
2899 | unsigned long long recovery_start; | |
2900 | ||
2901 | if (cmd_match(buf, "none")) | |
2902 | recovery_start = MaxSector; | |
b29bebd6 | 2903 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
2904 | return -EINVAL; |
2905 | ||
2906 | if (rdev->mddev->pers && | |
2907 | rdev->raid_disk >= 0) | |
2908 | return -EBUSY; | |
2909 | ||
2910 | rdev->recovery_offset = recovery_start; | |
2911 | if (recovery_start == MaxSector) | |
2912 | set_bit(In_sync, &rdev->flags); | |
2913 | else | |
2914 | clear_bit(In_sync, &rdev->flags); | |
2915 | return len; | |
2916 | } | |
2917 | ||
2918 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2919 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2920 | ||
16c791a5 N |
2921 | static ssize_t |
2922 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2923 | static ssize_t | |
2924 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2925 | ||
3cb03002 | 2926 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2927 | { |
2928 | return badblocks_show(&rdev->badblocks, page, 0); | |
2929 | } | |
3cb03002 | 2930 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 2931 | { |
de393cde N |
2932 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
2933 | /* Maybe that ack was all we needed */ | |
2934 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
2935 | wake_up(&rdev->blocked_wait); | |
2936 | return rv; | |
16c791a5 N |
2937 | } |
2938 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2939 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2940 | ||
3cb03002 | 2941 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2942 | { |
2943 | return badblocks_show(&rdev->badblocks, page, 1); | |
2944 | } | |
3cb03002 | 2945 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
2946 | { |
2947 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2948 | } | |
2949 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
2950 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
2951 | ||
86e6ffdd N |
2952 | static struct attribute *rdev_default_attrs[] = { |
2953 | &rdev_state.attr, | |
4dbcdc75 | 2954 | &rdev_errors.attr, |
014236d2 | 2955 | &rdev_slot.attr, |
93c8cad0 | 2956 | &rdev_offset.attr, |
c6563a8c | 2957 | &rdev_new_offset.attr, |
83303b61 | 2958 | &rdev_size.attr, |
06e3c817 | 2959 | &rdev_recovery_start.attr, |
16c791a5 N |
2960 | &rdev_bad_blocks.attr, |
2961 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
2962 | NULL, |
2963 | }; | |
2964 | static ssize_t | |
2965 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2966 | { | |
2967 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2968 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
86e6ffdd N |
2969 | |
2970 | if (!entry->show) | |
2971 | return -EIO; | |
758bfc8a N |
2972 | if (!rdev->mddev) |
2973 | return -EBUSY; | |
2974 | return entry->show(rdev, page); | |
86e6ffdd N |
2975 | } |
2976 | ||
2977 | static ssize_t | |
2978 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2979 | const char *page, size_t length) | |
2980 | { | |
2981 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2982 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 2983 | ssize_t rv; |
fd01b88c | 2984 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
2985 | |
2986 | if (!entry->store) | |
2987 | return -EIO; | |
67463acb N |
2988 | if (!capable(CAP_SYS_ADMIN)) |
2989 | return -EACCES; | |
27c529bb | 2990 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2991 | if (!rv) { |
27c529bb N |
2992 | if (rdev->mddev == NULL) |
2993 | rv = -EBUSY; | |
2994 | else | |
2995 | rv = entry->store(rdev, page, length); | |
6a51830e | 2996 | mddev_unlock(mddev); |
ca388059 N |
2997 | } |
2998 | return rv; | |
86e6ffdd N |
2999 | } |
3000 | ||
3001 | static void rdev_free(struct kobject *ko) | |
3002 | { | |
3cb03002 | 3003 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3004 | kfree(rdev); |
3005 | } | |
52cf25d0 | 3006 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3007 | .show = rdev_attr_show, |
3008 | .store = rdev_attr_store, | |
3009 | }; | |
3010 | static struct kobj_type rdev_ktype = { | |
3011 | .release = rdev_free, | |
3012 | .sysfs_ops = &rdev_sysfs_ops, | |
3013 | .default_attrs = rdev_default_attrs, | |
3014 | }; | |
3015 | ||
3cb03002 | 3016 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3017 | { |
3018 | rdev->desc_nr = -1; | |
3019 | rdev->saved_raid_disk = -1; | |
3020 | rdev->raid_disk = -1; | |
3021 | rdev->flags = 0; | |
3022 | rdev->data_offset = 0; | |
c6563a8c | 3023 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3024 | rdev->sb_events = 0; |
3025 | rdev->last_read_error.tv_sec = 0; | |
3026 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3027 | rdev->sb_loaded = 0; |
3028 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3029 | atomic_set(&rdev->nr_pending, 0); |
3030 | atomic_set(&rdev->read_errors, 0); | |
3031 | atomic_set(&rdev->corrected_errors, 0); | |
3032 | ||
3033 | INIT_LIST_HEAD(&rdev->same_set); | |
3034 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3035 | |
3036 | /* Add space to store bad block list. | |
3037 | * This reserves the space even on arrays where it cannot | |
3038 | * be used - I wonder if that matters | |
3039 | */ | |
3040 | rdev->badblocks.count = 0; | |
486adf72 | 3041 | rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
2230dfe4 N |
3042 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3043 | seqlock_init(&rdev->badblocks.lock); | |
3044 | if (rdev->badblocks.page == NULL) | |
3045 | return -ENOMEM; | |
3046 | ||
3047 | return 0; | |
e8bb9a83 N |
3048 | } |
3049 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3050 | /* |
3051 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3052 | * | |
3053 | * mark the device faulty if: | |
3054 | * | |
3055 | * - the device is nonexistent (zero size) | |
3056 | * - the device has no valid superblock | |
3057 | * | |
3058 | * a faulty rdev _never_ has rdev->sb set. | |
3059 | */ | |
3cb03002 | 3060 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3061 | { |
3062 | char b[BDEVNAME_SIZE]; | |
3063 | int err; | |
3cb03002 | 3064 | struct md_rdev *rdev; |
1da177e4 LT |
3065 | sector_t size; |
3066 | ||
9ffae0cf | 3067 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3068 | if (!rdev) { |
3069 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3070 | return ERR_PTR(-ENOMEM); | |
3071 | } | |
1da177e4 | 3072 | |
2230dfe4 N |
3073 | err = md_rdev_init(rdev); |
3074 | if (err) | |
3075 | goto abort_free; | |
3076 | err = alloc_disk_sb(rdev); | |
3077 | if (err) | |
1da177e4 LT |
3078 | goto abort_free; |
3079 | ||
c5d79adb | 3080 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3081 | if (err) |
3082 | goto abort_free; | |
3083 | ||
f9cb074b | 3084 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3085 | |
77304d2a | 3086 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3087 | if (!size) { |
f72ffdd6 | 3088 | printk(KERN_WARNING |
1da177e4 LT |
3089 | "md: %s has zero or unknown size, marking faulty!\n", |
3090 | bdevname(rdev->bdev,b)); | |
3091 | err = -EINVAL; | |
3092 | goto abort_free; | |
3093 | } | |
3094 | ||
3095 | if (super_format >= 0) { | |
3096 | err = super_types[super_format]. | |
3097 | load_super(rdev, NULL, super_minor); | |
3098 | if (err == -EINVAL) { | |
df968c4e N |
3099 | printk(KERN_WARNING |
3100 | "md: %s does not have a valid v%d.%d " | |
3101 | "superblock, not importing!\n", | |
3102 | bdevname(rdev->bdev,b), | |
3103 | super_format, super_minor); | |
1da177e4 LT |
3104 | goto abort_free; |
3105 | } | |
3106 | if (err < 0) { | |
f72ffdd6 | 3107 | printk(KERN_WARNING |
1da177e4 LT |
3108 | "md: could not read %s's sb, not importing!\n", |
3109 | bdevname(rdev->bdev,b)); | |
3110 | goto abort_free; | |
3111 | } | |
3112 | } | |
6bfe0b49 | 3113 | |
1da177e4 LT |
3114 | return rdev; |
3115 | ||
3116 | abort_free: | |
2699b672 N |
3117 | if (rdev->bdev) |
3118 | unlock_rdev(rdev); | |
545c8795 | 3119 | md_rdev_clear(rdev); |
1da177e4 LT |
3120 | kfree(rdev); |
3121 | return ERR_PTR(err); | |
3122 | } | |
3123 | ||
3124 | /* | |
3125 | * Check a full RAID array for plausibility | |
3126 | */ | |
3127 | ||
f72ffdd6 | 3128 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3129 | { |
3130 | int i; | |
3cb03002 | 3131 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3132 | char b[BDEVNAME_SIZE]; |
3133 | ||
3134 | freshest = NULL; | |
dafb20fa | 3135 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3136 | switch (super_types[mddev->major_version]. |
3137 | load_super(rdev, freshest, mddev->minor_version)) { | |
3138 | case 1: | |
3139 | freshest = rdev; | |
3140 | break; | |
3141 | case 0: | |
3142 | break; | |
3143 | default: | |
3144 | printk( KERN_ERR \ | |
3145 | "md: fatal superblock inconsistency in %s" | |
f72ffdd6 | 3146 | " -- removing from array\n", |
1da177e4 LT |
3147 | bdevname(rdev->bdev,b)); |
3148 | kick_rdev_from_array(rdev); | |
3149 | } | |
3150 | ||
1da177e4 LT |
3151 | super_types[mddev->major_version]. |
3152 | validate_super(mddev, freshest); | |
3153 | ||
3154 | i = 0; | |
dafb20fa | 3155 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3156 | if (mddev->max_disks && |
3157 | (rdev->desc_nr >= mddev->max_disks || | |
3158 | i > mddev->max_disks)) { | |
de01dfad N |
3159 | printk(KERN_WARNING |
3160 | "md: %s: %s: only %d devices permitted\n", | |
3161 | mdname(mddev), bdevname(rdev->bdev, b), | |
3162 | mddev->max_disks); | |
3163 | kick_rdev_from_array(rdev); | |
3164 | continue; | |
3165 | } | |
1da177e4 LT |
3166 | if (rdev != freshest) |
3167 | if (super_types[mddev->major_version]. | |
3168 | validate_super(mddev, rdev)) { | |
3169 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3170 | " from array!\n", | |
3171 | bdevname(rdev->bdev,b)); | |
3172 | kick_rdev_from_array(rdev); | |
3173 | continue; | |
3174 | } | |
3175 | if (mddev->level == LEVEL_MULTIPATH) { | |
3176 | rdev->desc_nr = i++; | |
3177 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3178 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3179 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3180 | rdev->raid_disk = -1; |
3181 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3182 | } |
3183 | } | |
1da177e4 LT |
3184 | } |
3185 | ||
72e02075 N |
3186 | /* Read a fixed-point number. |
3187 | * Numbers in sysfs attributes should be in "standard" units where | |
3188 | * possible, so time should be in seconds. | |
f72ffdd6 | 3189 | * However we internally use a a much smaller unit such as |
72e02075 N |
3190 | * milliseconds or jiffies. |
3191 | * This function takes a decimal number with a possible fractional | |
3192 | * component, and produces an integer which is the result of | |
3193 | * multiplying that number by 10^'scale'. | |
3194 | * all without any floating-point arithmetic. | |
3195 | */ | |
3196 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3197 | { | |
3198 | unsigned long result = 0; | |
3199 | long decimals = -1; | |
3200 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3201 | if (*cp == '.') | |
3202 | decimals = 0; | |
3203 | else if (decimals < scale) { | |
3204 | unsigned int value; | |
3205 | value = *cp - '0'; | |
3206 | result = result * 10 + value; | |
3207 | if (decimals >= 0) | |
3208 | decimals++; | |
3209 | } | |
3210 | cp++; | |
3211 | } | |
3212 | if (*cp == '\n') | |
3213 | cp++; | |
3214 | if (*cp) | |
3215 | return -EINVAL; | |
3216 | if (decimals < 0) | |
3217 | decimals = 0; | |
3218 | while (decimals < scale) { | |
3219 | result *= 10; | |
3220 | decimals ++; | |
3221 | } | |
3222 | *res = result; | |
3223 | return 0; | |
3224 | } | |
3225 | ||
19052c0e N |
3226 | static void md_safemode_timeout(unsigned long data); |
3227 | ||
16f17b39 | 3228 | static ssize_t |
fd01b88c | 3229 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3230 | { |
3231 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3232 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3233 | } | |
3234 | static ssize_t | |
fd01b88c | 3235 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3236 | { |
16f17b39 | 3237 | unsigned long msec; |
97ce0a7f | 3238 | |
72e02075 | 3239 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3240 | return -EINVAL; |
16f17b39 N |
3241 | if (msec == 0) |
3242 | mddev->safemode_delay = 0; | |
3243 | else { | |
19052c0e | 3244 | unsigned long old_delay = mddev->safemode_delay; |
1b30e66f N |
3245 | unsigned long new_delay = (msec*HZ)/1000; |
3246 | ||
3247 | if (new_delay == 0) | |
3248 | new_delay = 1; | |
3249 | mddev->safemode_delay = new_delay; | |
3250 | if (new_delay < old_delay || old_delay == 0) | |
3251 | mod_timer(&mddev->safemode_timer, jiffies+1); | |
16f17b39 N |
3252 | } |
3253 | return len; | |
3254 | } | |
3255 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3256 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3257 | |
eae1701f | 3258 | static ssize_t |
fd01b88c | 3259 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3260 | { |
36d091f4 N |
3261 | struct md_personality *p; |
3262 | int ret; | |
3263 | spin_lock(&mddev->lock); | |
3264 | p = mddev->pers; | |
d9d166c2 | 3265 | if (p) |
36d091f4 | 3266 | ret = sprintf(page, "%s\n", p->name); |
d9d166c2 | 3267 | else if (mddev->clevel[0]) |
36d091f4 | 3268 | ret = sprintf(page, "%s\n", mddev->clevel); |
d9d166c2 | 3269 | else if (mddev->level != LEVEL_NONE) |
36d091f4 | 3270 | ret = sprintf(page, "%d\n", mddev->level); |
d9d166c2 | 3271 | else |
36d091f4 N |
3272 | ret = 0; |
3273 | spin_unlock(&mddev->lock); | |
3274 | return ret; | |
eae1701f N |
3275 | } |
3276 | ||
d9d166c2 | 3277 | static ssize_t |
fd01b88c | 3278 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3279 | { |
f2859af6 | 3280 | char clevel[16]; |
20a49ff6 | 3281 | ssize_t rv = len; |
db721d32 | 3282 | struct md_personality *pers, *oldpers; |
f2859af6 | 3283 | long level; |
db721d32 | 3284 | void *priv, *oldpriv; |
3cb03002 | 3285 | struct md_rdev *rdev; |
245f46c2 N |
3286 | |
3287 | if (mddev->pers == NULL) { | |
3288 | if (len == 0) | |
3289 | return 0; | |
3290 | if (len >= sizeof(mddev->clevel)) | |
3291 | return -ENOSPC; | |
3292 | strncpy(mddev->clevel, buf, len); | |
3293 | if (mddev->clevel[len-1] == '\n') | |
3294 | len--; | |
3295 | mddev->clevel[len] = 0; | |
3296 | mddev->level = LEVEL_NONE; | |
3297 | return rv; | |
3298 | } | |
bd8839e0 N |
3299 | if (mddev->ro) |
3300 | return -EROFS; | |
245f46c2 N |
3301 | |
3302 | /* request to change the personality. Need to ensure: | |
3303 | * - array is not engaged in resync/recovery/reshape | |
3304 | * - old personality can be suspended | |
3305 | * - new personality will access other array. | |
3306 | */ | |
3307 | ||
bb4f1e9d | 3308 | if (mddev->sync_thread || |
f851b60d | 3309 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3310 | mddev->reshape_position != MaxSector || |
3311 | mddev->sysfs_active) | |
d9d166c2 | 3312 | return -EBUSY; |
245f46c2 N |
3313 | |
3314 | if (!mddev->pers->quiesce) { | |
3315 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3316 | mdname(mddev), mddev->pers->name); | |
3317 | return -EINVAL; | |
3318 | } | |
3319 | ||
3320 | /* Now find the new personality */ | |
f2859af6 | 3321 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3322 | return -EINVAL; |
f2859af6 DW |
3323 | strncpy(clevel, buf, len); |
3324 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3325 | len--; |
f2859af6 | 3326 | clevel[len] = 0; |
b29bebd6 | 3327 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3328 | level = LEVEL_NONE; |
245f46c2 | 3329 | |
f2859af6 DW |
3330 | if (request_module("md-%s", clevel) != 0) |
3331 | request_module("md-level-%s", clevel); | |
245f46c2 | 3332 | spin_lock(&pers_lock); |
f2859af6 | 3333 | pers = find_pers(level, clevel); |
245f46c2 N |
3334 | if (!pers || !try_module_get(pers->owner)) { |
3335 | spin_unlock(&pers_lock); | |
f2859af6 | 3336 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3337 | return -EINVAL; |
3338 | } | |
3339 | spin_unlock(&pers_lock); | |
3340 | ||
3341 | if (pers == mddev->pers) { | |
3342 | /* Nothing to do! */ | |
3343 | module_put(pers->owner); | |
3344 | return rv; | |
3345 | } | |
3346 | if (!pers->takeover) { | |
3347 | module_put(pers->owner); | |
3348 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3349 | mdname(mddev), clevel); |
245f46c2 N |
3350 | return -EINVAL; |
3351 | } | |
3352 | ||
dafb20fa | 3353 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3354 | rdev->new_raid_disk = rdev->raid_disk; |
3355 | ||
245f46c2 N |
3356 | /* ->takeover must set new_* and/or delta_disks |
3357 | * if it succeeds, and may set them when it fails. | |
3358 | */ | |
3359 | priv = pers->takeover(mddev); | |
3360 | if (IS_ERR(priv)) { | |
3361 | mddev->new_level = mddev->level; | |
3362 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3363 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3364 | mddev->raid_disks -= mddev->delta_disks; |
3365 | mddev->delta_disks = 0; | |
2c810cdd | 3366 | mddev->reshape_backwards = 0; |
245f46c2 N |
3367 | module_put(pers->owner); |
3368 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3369 | mdname(mddev), clevel); |
245f46c2 N |
3370 | return PTR_ERR(priv); |
3371 | } | |
3372 | ||
3373 | /* Looks like we have a winner */ | |
3374 | mddev_suspend(mddev); | |
5aa61f42 | 3375 | mddev_detach(mddev); |
36d091f4 N |
3376 | |
3377 | spin_lock(&mddev->lock); | |
db721d32 N |
3378 | oldpers = mddev->pers; |
3379 | oldpriv = mddev->private; | |
3380 | mddev->pers = pers; | |
3381 | mddev->private = priv; | |
3382 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3383 | mddev->level = mddev->new_level; | |
3384 | mddev->layout = mddev->new_layout; | |
3385 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
3386 | mddev->delta_disks = 0; | |
3387 | mddev->reshape_backwards = 0; | |
3388 | mddev->degraded = 0; | |
36d091f4 | 3389 | spin_unlock(&mddev->lock); |
db721d32 N |
3390 | |
3391 | if (oldpers->sync_request == NULL && | |
3392 | mddev->external) { | |
3393 | /* We are converting from a no-redundancy array | |
3394 | * to a redundancy array and metadata is managed | |
3395 | * externally so we need to be sure that writes | |
3396 | * won't block due to a need to transition | |
3397 | * clean->dirty | |
3398 | * until external management is started. | |
3399 | */ | |
3400 | mddev->in_sync = 0; | |
3401 | mddev->safemode_delay = 0; | |
3402 | mddev->safemode = 0; | |
3403 | } | |
f72ffdd6 | 3404 | |
db721d32 N |
3405 | oldpers->free(mddev, oldpriv); |
3406 | ||
3407 | if (oldpers->sync_request == NULL && | |
a64c876f N |
3408 | pers->sync_request != NULL) { |
3409 | /* need to add the md_redundancy_group */ | |
3410 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3411 | printk(KERN_WARNING | |
3412 | "md: cannot register extra attributes for %s\n", | |
3413 | mdname(mddev)); | |
388975cc | 3414 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3415 | } |
db721d32 | 3416 | if (oldpers->sync_request != NULL && |
a64c876f N |
3417 | pers->sync_request == NULL) { |
3418 | /* need to remove the md_redundancy_group */ | |
3419 | if (mddev->to_remove == NULL) | |
3420 | mddev->to_remove = &md_redundancy_group; | |
3421 | } | |
3422 | ||
dafb20fa | 3423 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3424 | if (rdev->raid_disk < 0) |
3425 | continue; | |
bf2cb0da | 3426 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3427 | rdev->new_raid_disk = -1; |
3428 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3429 | continue; | |
36fad858 | 3430 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3431 | } |
dafb20fa | 3432 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3433 | if (rdev->raid_disk < 0) |
3434 | continue; | |
3435 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3436 | continue; | |
3437 | rdev->raid_disk = rdev->new_raid_disk; | |
3438 | if (rdev->raid_disk < 0) | |
3a981b03 | 3439 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3440 | else { |
36fad858 NK |
3441 | if (sysfs_link_rdev(mddev, rdev)) |
3442 | printk(KERN_WARNING "md: cannot register rd%d" | |
3443 | " for %s after level change\n", | |
3444 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3445 | } |
e93f68a1 N |
3446 | } |
3447 | ||
db721d32 | 3448 | if (pers->sync_request == NULL) { |
9af204cf TM |
3449 | /* this is now an array without redundancy, so |
3450 | * it must always be in_sync | |
3451 | */ | |
3452 | mddev->in_sync = 1; | |
3453 | del_timer_sync(&mddev->safemode_timer); | |
3454 | } | |
02e5f5c0 | 3455 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3456 | pers->run(mddev); |
245f46c2 | 3457 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3458 | mddev_resume(mddev); |
830778a1 N |
3459 | if (!mddev->thread) |
3460 | md_update_sb(mddev, 1); | |
5cac7861 | 3461 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3462 | md_new_event(mddev); |
d9d166c2 N |
3463 | return rv; |
3464 | } | |
3465 | ||
3466 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3467 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3468 | |
d4dbd025 | 3469 | static ssize_t |
fd01b88c | 3470 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3471 | { |
3472 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3473 | if (mddev->reshape_position != MaxSector && |
3474 | mddev->layout != mddev->new_layout) | |
3475 | return sprintf(page, "%d (%d)\n", | |
3476 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3477 | return sprintf(page, "%d\n", mddev->layout); |
3478 | } | |
3479 | ||
3480 | static ssize_t | |
fd01b88c | 3481 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 N |
3482 | { |
3483 | char *e; | |
3484 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3485 | |
3486 | if (!*buf || (*e && *e != '\n')) | |
3487 | return -EINVAL; | |
3488 | ||
b3546035 N |
3489 | if (mddev->pers) { |
3490 | int err; | |
50ac168a | 3491 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3492 | return -EBUSY; |
bd8839e0 N |
3493 | if (mddev->ro) |
3494 | return -EROFS; | |
597a711b | 3495 | mddev->new_layout = n; |
50ac168a | 3496 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3497 | if (err) { |
3498 | mddev->new_layout = mddev->layout; | |
b3546035 | 3499 | return err; |
597a711b | 3500 | } |
b3546035 | 3501 | } else { |
08a02ecd | 3502 | mddev->new_layout = n; |
b3546035 N |
3503 | if (mddev->reshape_position == MaxSector) |
3504 | mddev->layout = n; | |
3505 | } | |
d4dbd025 N |
3506 | return len; |
3507 | } | |
3508 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3509 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3510 | |
eae1701f | 3511 | static ssize_t |
fd01b88c | 3512 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3513 | { |
bb636547 N |
3514 | if (mddev->raid_disks == 0) |
3515 | return 0; | |
08a02ecd N |
3516 | if (mddev->reshape_position != MaxSector && |
3517 | mddev->delta_disks != 0) | |
3518 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3519 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3520 | return sprintf(page, "%d\n", mddev->raid_disks); |
3521 | } | |
3522 | ||
fd01b88c | 3523 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3524 | |
3525 | static ssize_t | |
fd01b88c | 3526 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3527 | { |
da943b99 N |
3528 | char *e; |
3529 | int rv = 0; | |
3530 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3531 | ||
3532 | if (!*buf || (*e && *e != '\n')) | |
3533 | return -EINVAL; | |
3534 | ||
3535 | if (mddev->pers) | |
3536 | rv = update_raid_disks(mddev, n); | |
08a02ecd | 3537 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3538 | struct md_rdev *rdev; |
08a02ecd | 3539 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c N |
3540 | |
3541 | rdev_for_each(rdev, mddev) { | |
3542 | if (olddisks < n && | |
3543 | rdev->data_offset < rdev->new_data_offset) | |
3544 | return -EINVAL; | |
3545 | if (olddisks > n && | |
3546 | rdev->data_offset > rdev->new_data_offset) | |
3547 | return -EINVAL; | |
3548 | } | |
08a02ecd N |
3549 | mddev->delta_disks = n - olddisks; |
3550 | mddev->raid_disks = n; | |
2c810cdd | 3551 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3552 | } else |
da943b99 N |
3553 | mddev->raid_disks = n; |
3554 | return rv ? rv : len; | |
3555 | } | |
3556 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3557 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3558 | |
3b34380a | 3559 | static ssize_t |
fd01b88c | 3560 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3561 | { |
08a02ecd | 3562 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3563 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3564 | return sprintf(page, "%d (%d)\n", | |
3565 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3566 | mddev->chunk_sectors << 9); |
3567 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3568 | } |
3569 | ||
3570 | static ssize_t | |
fd01b88c | 3571 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3572 | { |
3b34380a N |
3573 | char *e; |
3574 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3575 | ||
3b34380a N |
3576 | if (!*buf || (*e && *e != '\n')) |
3577 | return -EINVAL; | |
3578 | ||
b3546035 N |
3579 | if (mddev->pers) { |
3580 | int err; | |
50ac168a | 3581 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3582 | return -EBUSY; |
bd8839e0 N |
3583 | if (mddev->ro) |
3584 | return -EROFS; | |
597a711b | 3585 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3586 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3587 | if (err) { |
3588 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3589 | return err; |
597a711b | 3590 | } |
b3546035 | 3591 | } else { |
664e7c41 | 3592 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3593 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3594 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3595 | } |
3b34380a N |
3596 | return len; |
3597 | } | |
3598 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3599 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3600 | |
a94213b1 | 3601 | static ssize_t |
fd01b88c | 3602 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3603 | { |
d1a7c503 N |
3604 | if (mddev->recovery_cp == MaxSector) |
3605 | return sprintf(page, "none\n"); | |
a94213b1 N |
3606 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3607 | } | |
3608 | ||
3609 | static ssize_t | |
fd01b88c | 3610 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3611 | { |
a94213b1 N |
3612 | char *e; |
3613 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3614 | ||
b098636c | 3615 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3616 | return -EBUSY; |
06e3c817 DW |
3617 | if (cmd_match(buf, "none")) |
3618 | n = MaxSector; | |
3619 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3620 | return -EINVAL; |
3621 | ||
3622 | mddev->recovery_cp = n; | |
db07d85e N |
3623 | if (mddev->pers) |
3624 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
a94213b1 N |
3625 | return len; |
3626 | } | |
3627 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3628 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3629 | |
9e653b63 N |
3630 | /* |
3631 | * The array state can be: | |
3632 | * | |
3633 | * clear | |
3634 | * No devices, no size, no level | |
3635 | * Equivalent to STOP_ARRAY ioctl | |
3636 | * inactive | |
3637 | * May have some settings, but array is not active | |
3638 | * all IO results in error | |
3639 | * When written, doesn't tear down array, but just stops it | |
3640 | * suspended (not supported yet) | |
3641 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3642 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3643 | * readonly |
3644 | * no resync can happen. no superblocks get written. | |
3645 | * write requests fail | |
3646 | * read-auto | |
3647 | * like readonly, but behaves like 'clean' on a write request. | |
3648 | * | |
3649 | * clean - no pending writes, but otherwise active. | |
3650 | * When written to inactive array, starts without resync | |
3651 | * If a write request arrives then | |
3652 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3653 | * if not known, block and switch to write-pending | |
3654 | * If written to an active array that has pending writes, then fails. | |
3655 | * active | |
3656 | * fully active: IO and resync can be happening. | |
3657 | * When written to inactive array, starts with resync | |
3658 | * | |
3659 | * write-pending | |
3660 | * clean, but writes are blocked waiting for 'active' to be written. | |
3661 | * | |
3662 | * active-idle | |
3663 | * like active, but no writes have been seen for a while (100msec). | |
3664 | * | |
3665 | */ | |
3666 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3667 | write_pending, active_idle, bad_word}; | |
05381954 | 3668 | static char *array_states[] = { |
9e653b63 N |
3669 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3670 | "write-pending", "active-idle", NULL }; | |
3671 | ||
3672 | static int match_word(const char *word, char **list) | |
3673 | { | |
3674 | int n; | |
3675 | for (n=0; list[n]; n++) | |
3676 | if (cmd_match(word, list[n])) | |
3677 | break; | |
3678 | return n; | |
3679 | } | |
3680 | ||
3681 | static ssize_t | |
fd01b88c | 3682 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3683 | { |
3684 | enum array_state st = inactive; | |
3685 | ||
3686 | if (mddev->pers) | |
3687 | switch(mddev->ro) { | |
3688 | case 1: | |
3689 | st = readonly; | |
3690 | break; | |
3691 | case 2: | |
3692 | st = read_auto; | |
3693 | break; | |
3694 | case 0: | |
3695 | if (mddev->in_sync) | |
3696 | st = clean; | |
070dc6dd | 3697 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3698 | st = write_pending; |
9e653b63 N |
3699 | else if (mddev->safemode) |
3700 | st = active_idle; | |
3701 | else | |
3702 | st = active; | |
3703 | } | |
3704 | else { | |
3705 | if (list_empty(&mddev->disks) && | |
3706 | mddev->raid_disks == 0 && | |
58c0fed4 | 3707 | mddev->dev_sectors == 0) |
9e653b63 N |
3708 | st = clear; |
3709 | else | |
3710 | st = inactive; | |
3711 | } | |
3712 | return sprintf(page, "%s\n", array_states[st]); | |
3713 | } | |
3714 | ||
f72ffdd6 N |
3715 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
3716 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
3717 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 3718 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
3719 | |
3720 | static ssize_t | |
fd01b88c | 3721 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 N |
3722 | { |
3723 | int err = -EINVAL; | |
3724 | enum array_state st = match_word(buf, array_states); | |
3725 | switch(st) { | |
3726 | case bad_word: | |
3727 | break; | |
3728 | case clear: | |
3729 | /* stopping an active array */ | |
a05b7ea0 | 3730 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3731 | break; |
3732 | case inactive: | |
3733 | /* stopping an active array */ | |
90cf195d | 3734 | if (mddev->pers) |
a05b7ea0 | 3735 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3736 | else |
e691063a | 3737 | err = 0; /* already inactive */ |
9e653b63 N |
3738 | break; |
3739 | case suspended: | |
3740 | break; /* not supported yet */ | |
3741 | case readonly: | |
3742 | if (mddev->pers) | |
a05b7ea0 | 3743 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3744 | else { |
3745 | mddev->ro = 1; | |
648b629e | 3746 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3747 | err = do_md_run(mddev); |
3748 | } | |
3749 | break; | |
3750 | case read_auto: | |
9e653b63 | 3751 | if (mddev->pers) { |
80268ee9 | 3752 | if (mddev->ro == 0) |
a05b7ea0 | 3753 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3754 | else if (mddev->ro == 1) |
648b629e N |
3755 | err = restart_array(mddev); |
3756 | if (err == 0) { | |
3757 | mddev->ro = 2; | |
3758 | set_disk_ro(mddev->gendisk, 0); | |
3759 | } | |
9e653b63 N |
3760 | } else { |
3761 | mddev->ro = 2; | |
3762 | err = do_md_run(mddev); | |
3763 | } | |
3764 | break; | |
3765 | case clean: | |
3766 | if (mddev->pers) { | |
3767 | restart_array(mddev); | |
85572d7c | 3768 | spin_lock(&mddev->lock); |
9e653b63 | 3769 | if (atomic_read(&mddev->writes_pending) == 0) { |
e691063a N |
3770 | if (mddev->in_sync == 0) { |
3771 | mddev->in_sync = 1; | |
31a59e34 N |
3772 | if (mddev->safemode == 1) |
3773 | mddev->safemode = 0; | |
070dc6dd | 3774 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3775 | } |
3776 | err = 0; | |
3777 | } else | |
3778 | err = -EBUSY; | |
85572d7c | 3779 | spin_unlock(&mddev->lock); |
5bf29597 N |
3780 | } else |
3781 | err = -EINVAL; | |
9e653b63 N |
3782 | break; |
3783 | case active: | |
3784 | if (mddev->pers) { | |
3785 | restart_array(mddev); | |
070dc6dd | 3786 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3787 | wake_up(&mddev->sb_wait); |
3788 | err = 0; | |
3789 | } else { | |
3790 | mddev->ro = 0; | |
648b629e | 3791 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3792 | err = do_md_run(mddev); |
3793 | } | |
3794 | break; | |
3795 | case write_pending: | |
3796 | case active_idle: | |
3797 | /* these cannot be set */ | |
3798 | break; | |
3799 | } | |
3800 | if (err) | |
3801 | return err; | |
0fd62b86 | 3802 | else { |
1d23f178 N |
3803 | if (mddev->hold_active == UNTIL_IOCTL) |
3804 | mddev->hold_active = 0; | |
00bcb4ac | 3805 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3806 | return len; |
0fd62b86 | 3807 | } |
9e653b63 | 3808 | } |
80ca3a44 N |
3809 | static struct md_sysfs_entry md_array_state = |
3810 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3811 | |
1e50915f | 3812 | static ssize_t |
fd01b88c | 3813 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3814 | return sprintf(page, "%d\n", |
3815 | atomic_read(&mddev->max_corr_read_errors)); | |
3816 | } | |
3817 | ||
3818 | static ssize_t | |
fd01b88c | 3819 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f RB |
3820 | { |
3821 | char *e; | |
3822 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3823 | ||
3824 | if (*buf && (*e == 0 || *e == '\n')) { | |
3825 | atomic_set(&mddev->max_corr_read_errors, n); | |
3826 | return len; | |
3827 | } | |
3828 | return -EINVAL; | |
3829 | } | |
3830 | ||
3831 | static struct md_sysfs_entry max_corr_read_errors = | |
3832 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3833 | max_corrected_read_errors_store); | |
3834 | ||
6d7ff738 | 3835 | static ssize_t |
fd01b88c | 3836 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3837 | { |
3838 | return -EINVAL; | |
3839 | } | |
3840 | ||
3841 | static ssize_t | |
fd01b88c | 3842 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
3843 | { |
3844 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3845 | /* The new device is added to the array. | |
3846 | * If the array has a persistent superblock, we read the | |
3847 | * superblock to initialise info and check validity. | |
3848 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3849 | * which mainly checks size. | |
3850 | */ | |
3851 | char *e; | |
3852 | int major = simple_strtoul(buf, &e, 10); | |
3853 | int minor; | |
3854 | dev_t dev; | |
3cb03002 | 3855 | struct md_rdev *rdev; |
6d7ff738 N |
3856 | int err; |
3857 | ||
3858 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3859 | return -EINVAL; | |
3860 | minor = simple_strtoul(e+1, &e, 10); | |
3861 | if (*e && *e != '\n') | |
3862 | return -EINVAL; | |
3863 | dev = MKDEV(major, minor); | |
3864 | if (major != MAJOR(dev) || | |
3865 | minor != MINOR(dev)) | |
3866 | return -EOVERFLOW; | |
3867 | ||
6d7ff738 N |
3868 | if (mddev->persistent) { |
3869 | rdev = md_import_device(dev, mddev->major_version, | |
3870 | mddev->minor_version); | |
3871 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
3872 | struct md_rdev *rdev0 |
3873 | = list_entry(mddev->disks.next, | |
3874 | struct md_rdev, same_set); | |
6d7ff738 N |
3875 | err = super_types[mddev->major_version] |
3876 | .load_super(rdev, rdev0, mddev->minor_version); | |
3877 | if (err < 0) | |
3878 | goto out; | |
3879 | } | |
c5d79adb N |
3880 | } else if (mddev->external) |
3881 | rdev = md_import_device(dev, -2, -1); | |
3882 | else | |
6d7ff738 N |
3883 | rdev = md_import_device(dev, -1, -1); |
3884 | ||
3885 | if (IS_ERR(rdev)) | |
3886 | return PTR_ERR(rdev); | |
3887 | err = bind_rdev_to_array(rdev, mddev); | |
3888 | out: | |
3889 | if (err) | |
3890 | export_rdev(rdev); | |
3891 | return err ? err : len; | |
3892 | } | |
3893 | ||
3894 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3895 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3896 | |
9b1d1dac | 3897 | static ssize_t |
fd01b88c | 3898 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
3899 | { |
3900 | char *end; | |
3901 | unsigned long chunk, end_chunk; | |
3902 | ||
3903 | if (!mddev->bitmap) | |
3904 | goto out; | |
3905 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3906 | while (*buf) { | |
3907 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3908 | if (buf == end) break; | |
3909 | if (*end == '-') { /* range */ | |
3910 | buf = end + 1; | |
3911 | end_chunk = simple_strtoul(buf, &end, 0); | |
3912 | if (buf == end) break; | |
3913 | } | |
3914 | if (*end && !isspace(*end)) break; | |
3915 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3916 | buf = skip_spaces(end); |
9b1d1dac PC |
3917 | } |
3918 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3919 | out: | |
3920 | return len; | |
3921 | } | |
3922 | ||
3923 | static struct md_sysfs_entry md_bitmap = | |
3924 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3925 | ||
a35b0d69 | 3926 | static ssize_t |
fd01b88c | 3927 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 3928 | { |
58c0fed4 AN |
3929 | return sprintf(page, "%llu\n", |
3930 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3931 | } |
3932 | ||
fd01b88c | 3933 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
3934 | |
3935 | static ssize_t | |
fd01b88c | 3936 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
3937 | { |
3938 | /* If array is inactive, we can reduce the component size, but | |
3939 | * not increase it (except from 0). | |
3940 | * If array is active, we can try an on-line resize | |
3941 | */ | |
b522adcd DW |
3942 | sector_t sectors; |
3943 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3944 | |
58c0fed4 AN |
3945 | if (err < 0) |
3946 | return err; | |
a35b0d69 | 3947 | if (mddev->pers) { |
58c0fed4 | 3948 | err = update_size(mddev, sectors); |
850b2b42 | 3949 | md_update_sb(mddev, 1); |
a35b0d69 | 3950 | } else { |
58c0fed4 AN |
3951 | if (mddev->dev_sectors == 0 || |
3952 | mddev->dev_sectors > sectors) | |
3953 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3954 | else |
3955 | err = -ENOSPC; | |
3956 | } | |
3957 | return err ? err : len; | |
3958 | } | |
3959 | ||
3960 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3961 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3962 | |
83f0d77a | 3963 | /* Metadata version. |
e691063a N |
3964 | * This is one of |
3965 | * 'none' for arrays with no metadata (good luck...) | |
3966 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3967 | * or N.M for internally known formats |
3968 | */ | |
3969 | static ssize_t | |
fd01b88c | 3970 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
3971 | { |
3972 | if (mddev->persistent) | |
3973 | return sprintf(page, "%d.%d\n", | |
3974 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3975 | else if (mddev->external) |
3976 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3977 | else |
3978 | return sprintf(page, "none\n"); | |
3979 | } | |
3980 | ||
3981 | static ssize_t | |
fd01b88c | 3982 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
3983 | { |
3984 | int major, minor; | |
3985 | char *e; | |
ea43ddd8 N |
3986 | /* Changing the details of 'external' metadata is |
3987 | * always permitted. Otherwise there must be | |
3988 | * no devices attached to the array. | |
3989 | */ | |
3990 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3991 | ; | |
3992 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3993 | return -EBUSY; |
3994 | ||
3995 | if (cmd_match(buf, "none")) { | |
3996 | mddev->persistent = 0; | |
e691063a N |
3997 | mddev->external = 0; |
3998 | mddev->major_version = 0; | |
3999 | mddev->minor_version = 90; | |
4000 | return len; | |
4001 | } | |
4002 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4003 | size_t namelen = len-9; |
e691063a N |
4004 | if (namelen >= sizeof(mddev->metadata_type)) |
4005 | namelen = sizeof(mddev->metadata_type)-1; | |
4006 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4007 | mddev->metadata_type[namelen] = 0; | |
4008 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4009 | mddev->metadata_type[--namelen] = 0; | |
4010 | mddev->persistent = 0; | |
4011 | mddev->external = 1; | |
8bb93aac N |
4012 | mddev->major_version = 0; |
4013 | mddev->minor_version = 90; | |
4014 | return len; | |
4015 | } | |
4016 | major = simple_strtoul(buf, &e, 10); | |
4017 | if (e==buf || *e != '.') | |
4018 | return -EINVAL; | |
4019 | buf = e+1; | |
4020 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4021 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 4022 | return -EINVAL; |
50511da3 | 4023 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
4024 | return -ENOENT; |
4025 | mddev->major_version = major; | |
4026 | mddev->minor_version = minor; | |
4027 | mddev->persistent = 1; | |
e691063a | 4028 | mddev->external = 0; |
8bb93aac N |
4029 | return len; |
4030 | } | |
4031 | ||
4032 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 4033 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4034 | |
24dd469d | 4035 | static ssize_t |
fd01b88c | 4036 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4037 | { |
7eec314d | 4038 | char *type = "idle"; |
b7b17c9b N |
4039 | unsigned long recovery = mddev->recovery; |
4040 | if (test_bit(MD_RECOVERY_FROZEN, &recovery)) | |
b6a9ce68 | 4041 | type = "frozen"; |
b7b17c9b N |
4042 | else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || |
4043 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { | |
4044 | if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) | |
ccfcc3c1 | 4045 | type = "reshape"; |
b7b17c9b N |
4046 | else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { |
4047 | if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) | |
24dd469d | 4048 | type = "resync"; |
b7b17c9b | 4049 | else if (test_bit(MD_RECOVERY_CHECK, &recovery)) |
24dd469d N |
4050 | type = "check"; |
4051 | else | |
4052 | type = "repair"; | |
b7b17c9b | 4053 | } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) |
24dd469d N |
4054 | type = "recover"; |
4055 | } | |
4056 | return sprintf(page, "%s\n", type); | |
4057 | } | |
4058 | ||
4059 | static ssize_t | |
fd01b88c | 4060 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4061 | { |
7eec314d N |
4062 | if (!mddev->pers || !mddev->pers->sync_request) |
4063 | return -EINVAL; | |
4064 | ||
b6a9ce68 N |
4065 | if (cmd_match(page, "frozen")) |
4066 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4067 | else | |
4068 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4069 | ||
4070 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
f851b60d | 4071 | flush_workqueue(md_misc_wq); |
7eec314d N |
4072 | if (mddev->sync_thread) { |
4073 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
a91d5ac0 | 4074 | md_reap_sync_thread(mddev); |
7eec314d | 4075 | } |
03c902e1 N |
4076 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4077 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4078 | return -EBUSY; |
72a23c21 NB |
4079 | else if (cmd_match(page, "resync")) |
4080 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4081 | else if (cmd_match(page, "recover")) { | |
4082 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4083 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4084 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4085 | int err; |
4086 | if (mddev->pers->start_reshape == NULL) | |
4087 | return -EINVAL; | |
4088 | err = mddev->pers->start_reshape(mddev); | |
4089 | if (err) | |
4090 | return err; | |
a99ac971 | 4091 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4092 | } else { |
bce74dac | 4093 | if (cmd_match(page, "check")) |
7eec314d | 4094 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4095 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4096 | return -EINVAL; |
4097 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4098 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4099 | } |
48c26ddc N |
4100 | if (mddev->ro == 2) { |
4101 | /* A write to sync_action is enough to justify | |
4102 | * canceling read-auto mode | |
4103 | */ | |
4104 | mddev->ro = 0; | |
4105 | md_wakeup_thread(mddev->sync_thread); | |
4106 | } | |
03c902e1 | 4107 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4108 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4109 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4110 | return len; |
4111 | } | |
4112 | ||
c4a39551 JB |
4113 | static struct md_sysfs_entry md_scan_mode = |
4114 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
4115 | ||
4116 | static ssize_t | |
4117 | last_sync_action_show(struct mddev *mddev, char *page) | |
4118 | { | |
4119 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4120 | } | |
4121 | ||
4122 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4123 | ||
9d88883e | 4124 | static ssize_t |
fd01b88c | 4125 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4126 | { |
4127 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4128 | (unsigned long long) |
4129 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4130 | } |
4131 | ||
80ca3a44 | 4132 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4133 | |
88202a0c | 4134 | static ssize_t |
fd01b88c | 4135 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4136 | { |
4137 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4138 | mddev->sync_speed_min ? "local": "system"); | |
4139 | } | |
4140 | ||
4141 | static ssize_t | |
fd01b88c | 4142 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4143 | { |
4144 | int min; | |
4145 | char *e; | |
4146 | if (strncmp(buf, "system", 6)==0) { | |
4147 | mddev->sync_speed_min = 0; | |
4148 | return len; | |
4149 | } | |
4150 | min = simple_strtoul(buf, &e, 10); | |
4151 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4152 | return -EINVAL; | |
4153 | mddev->sync_speed_min = min; | |
4154 | return len; | |
4155 | } | |
4156 | ||
4157 | static struct md_sysfs_entry md_sync_min = | |
4158 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4159 | ||
4160 | static ssize_t | |
fd01b88c | 4161 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4162 | { |
4163 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4164 | mddev->sync_speed_max ? "local": "system"); | |
4165 | } | |
4166 | ||
4167 | static ssize_t | |
fd01b88c | 4168 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4169 | { |
4170 | int max; | |
4171 | char *e; | |
4172 | if (strncmp(buf, "system", 6)==0) { | |
4173 | mddev->sync_speed_max = 0; | |
4174 | return len; | |
4175 | } | |
4176 | max = simple_strtoul(buf, &e, 10); | |
4177 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4178 | return -EINVAL; | |
4179 | mddev->sync_speed_max = max; | |
4180 | return len; | |
4181 | } | |
4182 | ||
4183 | static struct md_sysfs_entry md_sync_max = | |
4184 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4185 | ||
d7f3d291 | 4186 | static ssize_t |
fd01b88c | 4187 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4188 | { |
4189 | return sprintf(page, "%d\n", mddev->degraded); | |
4190 | } | |
4191 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4192 | |
90b08710 | 4193 | static ssize_t |
fd01b88c | 4194 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4195 | { |
4196 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4197 | } | |
4198 | ||
4199 | static ssize_t | |
fd01b88c | 4200 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4201 | { |
4202 | long n; | |
4203 | ||
b29bebd6 | 4204 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4205 | return -EINVAL; |
4206 | ||
4207 | if (n != 0 && n != 1) | |
4208 | return -EINVAL; | |
4209 | ||
4210 | mddev->parallel_resync = n; | |
4211 | ||
4212 | if (mddev->sync_thread) | |
4213 | wake_up(&resync_wait); | |
4214 | ||
4215 | return len; | |
4216 | } | |
4217 | ||
4218 | /* force parallel resync, even with shared block devices */ | |
4219 | static struct md_sysfs_entry md_sync_force_parallel = | |
4220 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4221 | sync_force_parallel_show, sync_force_parallel_store); | |
4222 | ||
88202a0c | 4223 | static ssize_t |
fd01b88c | 4224 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4225 | { |
4226 | unsigned long resync, dt, db; | |
d1a7c503 N |
4227 | if (mddev->curr_resync == 0) |
4228 | return sprintf(page, "none\n"); | |
9687a60c AN |
4229 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4230 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4231 | if (!dt) dt++; |
9687a60c AN |
4232 | db = resync - mddev->resync_mark_cnt; |
4233 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4234 | } |
4235 | ||
80ca3a44 | 4236 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4237 | |
4238 | static ssize_t | |
fd01b88c | 4239 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4240 | { |
13ae864b | 4241 | unsigned long long max_sectors, resync; |
88202a0c | 4242 | |
acb180b0 N |
4243 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4244 | return sprintf(page, "none\n"); | |
4245 | ||
72f36d59 N |
4246 | if (mddev->curr_resync == 1 || |
4247 | mddev->curr_resync == 2) | |
4248 | return sprintf(page, "delayed\n"); | |
4249 | ||
c804cdec N |
4250 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4251 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4252 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4253 | else |
58c0fed4 | 4254 | max_sectors = mddev->dev_sectors; |
88202a0c | 4255 | |
acb180b0 | 4256 | resync = mddev->curr_resync_completed; |
13ae864b | 4257 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4258 | } |
4259 | ||
80ca3a44 | 4260 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4261 | |
5e96ee65 | 4262 | static ssize_t |
fd01b88c | 4263 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4264 | { |
4265 | return sprintf(page, "%llu\n", | |
4266 | (unsigned long long)mddev->resync_min); | |
4267 | } | |
4268 | static ssize_t | |
fd01b88c | 4269 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4270 | { |
4271 | unsigned long long min; | |
b29bebd6 | 4272 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 NB |
4273 | return -EINVAL; |
4274 | if (min > mddev->resync_max) | |
4275 | return -EINVAL; | |
4276 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4277 | return -EBUSY; | |
4278 | ||
4279 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4280 | if (mddev->chunk_sectors) { |
2ac06c33 | 4281 | sector_t temp = min; |
9d8f0363 | 4282 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4283 | return -EINVAL; |
4284 | } | |
4285 | mddev->resync_min = min; | |
4286 | ||
4287 | return len; | |
4288 | } | |
4289 | ||
4290 | static struct md_sysfs_entry md_min_sync = | |
4291 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4292 | ||
c6207277 | 4293 | static ssize_t |
fd01b88c | 4294 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4295 | { |
4296 | if (mddev->resync_max == MaxSector) | |
4297 | return sprintf(page, "max\n"); | |
4298 | else | |
4299 | return sprintf(page, "%llu\n", | |
4300 | (unsigned long long)mddev->resync_max); | |
4301 | } | |
4302 | static ssize_t | |
fd01b88c | 4303 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 N |
4304 | { |
4305 | if (strncmp(buf, "max", 3) == 0) | |
4306 | mddev->resync_max = MaxSector; | |
4307 | else { | |
5e96ee65 | 4308 | unsigned long long max; |
b29bebd6 | 4309 | if (kstrtoull(buf, 10, &max)) |
5e96ee65 NB |
4310 | return -EINVAL; |
4311 | if (max < mddev->resync_min) | |
c6207277 N |
4312 | return -EINVAL; |
4313 | if (max < mddev->resync_max && | |
4d484a4a | 4314 | mddev->ro == 0 && |
c6207277 N |
4315 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4316 | return -EBUSY; | |
4317 | ||
4318 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4319 | if (mddev->chunk_sectors) { |
2ac06c33 | 4320 | sector_t temp = max; |
9d8f0363 | 4321 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4322 | return -EINVAL; |
4323 | } | |
4324 | mddev->resync_max = max; | |
4325 | } | |
4326 | wake_up(&mddev->recovery_wait); | |
4327 | return len; | |
4328 | } | |
4329 | ||
4330 | static struct md_sysfs_entry md_max_sync = | |
4331 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4332 | ||
e464eafd | 4333 | static ssize_t |
fd01b88c | 4334 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4335 | { |
4336 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4337 | } | |
4338 | ||
4339 | static ssize_t | |
fd01b88c | 4340 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4341 | { |
4342 | char *e; | |
4343 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4344 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4345 | |
f72ffdd6 | 4346 | if (mddev->pers == NULL || |
b8d966ef | 4347 | mddev->pers->quiesce == NULL) |
e464eafd N |
4348 | return -EINVAL; |
4349 | if (buf == e || (*e && *e != '\n')) | |
4350 | return -EINVAL; | |
23ddff37 N |
4351 | |
4352 | mddev->suspend_lo = new; | |
4353 | if (new >= old) | |
4354 | /* Shrinking suspended region */ | |
e464eafd | 4355 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4356 | else { |
4357 | /* Expanding suspended region - need to wait */ | |
4358 | mddev->pers->quiesce(mddev, 1); | |
4359 | mddev->pers->quiesce(mddev, 0); | |
4360 | } | |
4361 | return len; | |
e464eafd N |
4362 | } |
4363 | static struct md_sysfs_entry md_suspend_lo = | |
4364 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4365 | ||
e464eafd | 4366 | static ssize_t |
fd01b88c | 4367 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4368 | { |
4369 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4370 | } | |
4371 | ||
4372 | static ssize_t | |
fd01b88c | 4373 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4374 | { |
4375 | char *e; | |
4376 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4377 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4378 | |
b8d966ef N |
4379 | if (mddev->pers == NULL || |
4380 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4381 | return -EINVAL; |
4382 | if (buf == e || (*e && *e != '\n')) | |
4383 | return -EINVAL; | |
23ddff37 N |
4384 | |
4385 | mddev->suspend_hi = new; | |
4386 | if (new <= old) | |
4387 | /* Shrinking suspended region */ | |
4388 | mddev->pers->quiesce(mddev, 2); | |
4389 | else { | |
4390 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4391 | mddev->pers->quiesce(mddev, 1); |
4392 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4393 | } |
4394 | return len; | |
e464eafd N |
4395 | } |
4396 | static struct md_sysfs_entry md_suspend_hi = | |
4397 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4398 | ||
08a02ecd | 4399 | static ssize_t |
fd01b88c | 4400 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4401 | { |
4402 | if (mddev->reshape_position != MaxSector) | |
4403 | return sprintf(page, "%llu\n", | |
4404 | (unsigned long long)mddev->reshape_position); | |
4405 | strcpy(page, "none\n"); | |
4406 | return 5; | |
4407 | } | |
4408 | ||
4409 | static ssize_t | |
fd01b88c | 4410 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4411 | { |
c6563a8c | 4412 | struct md_rdev *rdev; |
08a02ecd N |
4413 | char *e; |
4414 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4415 | if (mddev->pers) | |
4416 | return -EBUSY; | |
4417 | if (buf == e || (*e && *e != '\n')) | |
4418 | return -EINVAL; | |
4419 | mddev->reshape_position = new; | |
4420 | mddev->delta_disks = 0; | |
2c810cdd | 4421 | mddev->reshape_backwards = 0; |
08a02ecd N |
4422 | mddev->new_level = mddev->level; |
4423 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4424 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4425 | rdev_for_each(rdev, mddev) |
4426 | rdev->new_data_offset = rdev->data_offset; | |
08a02ecd N |
4427 | return len; |
4428 | } | |
4429 | ||
4430 | static struct md_sysfs_entry md_reshape_position = | |
4431 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4432 | reshape_position_store); | |
4433 | ||
2c810cdd N |
4434 | static ssize_t |
4435 | reshape_direction_show(struct mddev *mddev, char *page) | |
4436 | { | |
4437 | return sprintf(page, "%s\n", | |
4438 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4439 | } | |
4440 | ||
4441 | static ssize_t | |
4442 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4443 | { | |
4444 | int backwards = 0; | |
4445 | if (cmd_match(buf, "forwards")) | |
4446 | backwards = 0; | |
4447 | else if (cmd_match(buf, "backwards")) | |
4448 | backwards = 1; | |
4449 | else | |
4450 | return -EINVAL; | |
4451 | if (mddev->reshape_backwards == backwards) | |
4452 | return len; | |
4453 | ||
4454 | /* check if we are allowed to change */ | |
4455 | if (mddev->delta_disks) | |
4456 | return -EBUSY; | |
4457 | ||
4458 | if (mddev->persistent && | |
4459 | mddev->major_version == 0) | |
4460 | return -EINVAL; | |
4461 | ||
4462 | mddev->reshape_backwards = backwards; | |
4463 | return len; | |
4464 | } | |
4465 | ||
4466 | static struct md_sysfs_entry md_reshape_direction = | |
4467 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4468 | reshape_direction_store); | |
4469 | ||
b522adcd | 4470 | static ssize_t |
fd01b88c | 4471 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4472 | { |
4473 | if (mddev->external_size) | |
4474 | return sprintf(page, "%llu\n", | |
4475 | (unsigned long long)mddev->array_sectors/2); | |
4476 | else | |
4477 | return sprintf(page, "default\n"); | |
4478 | } | |
4479 | ||
4480 | static ssize_t | |
fd01b88c | 4481 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4482 | { |
4483 | sector_t sectors; | |
4484 | ||
4485 | if (strncmp(buf, "default", 7) == 0) { | |
4486 | if (mddev->pers) | |
4487 | sectors = mddev->pers->size(mddev, 0, 0); | |
4488 | else | |
4489 | sectors = mddev->array_sectors; | |
4490 | ||
4491 | mddev->external_size = 0; | |
4492 | } else { | |
4493 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4494 | return -EINVAL; | |
4495 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4496 | return -E2BIG; |
b522adcd DW |
4497 | |
4498 | mddev->external_size = 1; | |
4499 | } | |
4500 | ||
4501 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4502 | if (mddev->pers) { |
4503 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4504 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4505 | } |
b522adcd DW |
4506 | return len; |
4507 | } | |
4508 | ||
4509 | static struct md_sysfs_entry md_array_size = | |
4510 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4511 | array_size_store); | |
e464eafd | 4512 | |
eae1701f N |
4513 | static struct attribute *md_default_attrs[] = { |
4514 | &md_level.attr, | |
d4dbd025 | 4515 | &md_layout.attr, |
eae1701f | 4516 | &md_raid_disks.attr, |
3b34380a | 4517 | &md_chunk_size.attr, |
a35b0d69 | 4518 | &md_size.attr, |
a94213b1 | 4519 | &md_resync_start.attr, |
8bb93aac | 4520 | &md_metadata.attr, |
6d7ff738 | 4521 | &md_new_device.attr, |
16f17b39 | 4522 | &md_safe_delay.attr, |
9e653b63 | 4523 | &md_array_state.attr, |
08a02ecd | 4524 | &md_reshape_position.attr, |
2c810cdd | 4525 | &md_reshape_direction.attr, |
b522adcd | 4526 | &md_array_size.attr, |
1e50915f | 4527 | &max_corr_read_errors.attr, |
411036fa N |
4528 | NULL, |
4529 | }; | |
4530 | ||
4531 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4532 | &md_scan_mode.attr, |
c4a39551 | 4533 | &md_last_scan_mode.attr, |
9d88883e | 4534 | &md_mismatches.attr, |
88202a0c N |
4535 | &md_sync_min.attr, |
4536 | &md_sync_max.attr, | |
4537 | &md_sync_speed.attr, | |
90b08710 | 4538 | &md_sync_force_parallel.attr, |
88202a0c | 4539 | &md_sync_completed.attr, |
5e96ee65 | 4540 | &md_min_sync.attr, |
c6207277 | 4541 | &md_max_sync.attr, |
e464eafd N |
4542 | &md_suspend_lo.attr, |
4543 | &md_suspend_hi.attr, | |
9b1d1dac | 4544 | &md_bitmap.attr, |
d7f3d291 | 4545 | &md_degraded.attr, |
eae1701f N |
4546 | NULL, |
4547 | }; | |
411036fa N |
4548 | static struct attribute_group md_redundancy_group = { |
4549 | .name = NULL, | |
4550 | .attrs = md_redundancy_attrs, | |
4551 | }; | |
4552 | ||
eae1701f N |
4553 | static ssize_t |
4554 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4555 | { | |
4556 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4557 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4558 | ssize_t rv; |
eae1701f N |
4559 | |
4560 | if (!entry->show) | |
4561 | return -EIO; | |
af8a2434 N |
4562 | spin_lock(&all_mddevs_lock); |
4563 | if (list_empty(&mddev->all_mddevs)) { | |
4564 | spin_unlock(&all_mddevs_lock); | |
4565 | return -EBUSY; | |
4566 | } | |
4567 | mddev_get(mddev); | |
4568 | spin_unlock(&all_mddevs_lock); | |
4569 | ||
b7b17c9b | 4570 | rv = entry->show(mddev, page); |
af8a2434 | 4571 | mddev_put(mddev); |
96de1e66 | 4572 | return rv; |
eae1701f N |
4573 | } |
4574 | ||
4575 | static ssize_t | |
4576 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4577 | const char *page, size_t length) | |
4578 | { | |
4579 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4580 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4581 | ssize_t rv; |
eae1701f N |
4582 | |
4583 | if (!entry->store) | |
4584 | return -EIO; | |
67463acb N |
4585 | if (!capable(CAP_SYS_ADMIN)) |
4586 | return -EACCES; | |
af8a2434 N |
4587 | spin_lock(&all_mddevs_lock); |
4588 | if (list_empty(&mddev->all_mddevs)) { | |
4589 | spin_unlock(&all_mddevs_lock); | |
4590 | return -EBUSY; | |
4591 | } | |
4592 | mddev_get(mddev); | |
4593 | spin_unlock(&all_mddevs_lock); | |
a7a3f08d N |
4594 | if (entry->store == new_dev_store) |
4595 | flush_workqueue(md_misc_wq); | |
5dc5cf7d IM |
4596 | rv = mddev_lock(mddev); |
4597 | if (!rv) { | |
4598 | rv = entry->store(mddev, page, length); | |
4599 | mddev_unlock(mddev); | |
4600 | } | |
af8a2434 | 4601 | mddev_put(mddev); |
96de1e66 | 4602 | return rv; |
eae1701f N |
4603 | } |
4604 | ||
4605 | static void md_free(struct kobject *ko) | |
4606 | { | |
fd01b88c | 4607 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4608 | |
4609 | if (mddev->sysfs_state) | |
4610 | sysfs_put(mddev->sysfs_state); | |
4611 | ||
4612 | if (mddev->gendisk) { | |
4613 | del_gendisk(mddev->gendisk); | |
4614 | put_disk(mddev->gendisk); | |
4615 | } | |
4616 | if (mddev->queue) | |
4617 | blk_cleanup_queue(mddev->queue); | |
4618 | ||
eae1701f N |
4619 | kfree(mddev); |
4620 | } | |
4621 | ||
52cf25d0 | 4622 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4623 | .show = md_attr_show, |
4624 | .store = md_attr_store, | |
4625 | }; | |
4626 | static struct kobj_type md_ktype = { | |
4627 | .release = md_free, | |
4628 | .sysfs_ops = &md_sysfs_ops, | |
4629 | .default_attrs = md_default_attrs, | |
4630 | }; | |
4631 | ||
1da177e4 LT |
4632 | int mdp_major = 0; |
4633 | ||
5fd3a17e DW |
4634 | static void mddev_delayed_delete(struct work_struct *ws) |
4635 | { | |
fd01b88c | 4636 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4637 | |
43a70507 | 4638 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4639 | kobject_del(&mddev->kobj); |
4640 | kobject_put(&mddev->kobj); | |
4641 | } | |
4642 | ||
efeb53c0 | 4643 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4644 | { |
48c9c27b | 4645 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4646 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4647 | struct gendisk *disk; |
efeb53c0 N |
4648 | int partitioned; |
4649 | int shift; | |
4650 | int unit; | |
3830c62f | 4651 | int error; |
1da177e4 LT |
4652 | |
4653 | if (!mddev) | |
efeb53c0 N |
4654 | return -ENODEV; |
4655 | ||
4656 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4657 | shift = partitioned ? MdpMinorShift : 0; | |
4658 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4659 | |
e804ac78 TH |
4660 | /* wait for any previous instance of this device to be |
4661 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4662 | */ |
e804ac78 | 4663 | flush_workqueue(md_misc_wq); |
d3374825 | 4664 | |
48c9c27b | 4665 | mutex_lock(&disks_mutex); |
0909dc44 N |
4666 | error = -EEXIST; |
4667 | if (mddev->gendisk) | |
4668 | goto abort; | |
efeb53c0 N |
4669 | |
4670 | if (name) { | |
4671 | /* Need to ensure that 'name' is not a duplicate. | |
4672 | */ | |
fd01b88c | 4673 | struct mddev *mddev2; |
efeb53c0 N |
4674 | spin_lock(&all_mddevs_lock); |
4675 | ||
4676 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4677 | if (mddev2->gendisk && | |
4678 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4679 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4680 | goto abort; |
efeb53c0 N |
4681 | } |
4682 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4683 | } |
8b765398 | 4684 | |
0909dc44 | 4685 | error = -ENOMEM; |
8b765398 | 4686 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4687 | if (!mddev->queue) |
4688 | goto abort; | |
409c57f3 N |
4689 | mddev->queue->queuedata = mddev; |
4690 | ||
409c57f3 | 4691 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 4692 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 4693 | |
1da177e4 LT |
4694 | disk = alloc_disk(1 << shift); |
4695 | if (!disk) { | |
8b765398 N |
4696 | blk_cleanup_queue(mddev->queue); |
4697 | mddev->queue = NULL; | |
0909dc44 | 4698 | goto abort; |
1da177e4 | 4699 | } |
efeb53c0 | 4700 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4701 | disk->first_minor = unit << shift; |
efeb53c0 N |
4702 | if (name) |
4703 | strcpy(disk->disk_name, name); | |
4704 | else if (partitioned) | |
1da177e4 | 4705 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4706 | else |
1da177e4 | 4707 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4708 | disk->fops = &md_fops; |
4709 | disk->private_data = mddev; | |
4710 | disk->queue = mddev->queue; | |
b0140891 | 4711 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4712 | /* Allow extended partitions. This makes the |
d3374825 | 4713 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4714 | * remove it now. |
4715 | */ | |
4716 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4717 | mddev->gendisk = disk; |
b0140891 N |
4718 | /* As soon as we call add_disk(), another thread could get |
4719 | * through to md_open, so make sure it doesn't get too far | |
4720 | */ | |
4721 | mutex_lock(&mddev->open_mutex); | |
4722 | add_disk(disk); | |
4723 | ||
ed9e1982 TH |
4724 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4725 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4726 | if (error) { |
4727 | /* This isn't possible, but as kobject_init_and_add is marked | |
4728 | * __must_check, we must do something with the result | |
4729 | */ | |
5e55e2f5 N |
4730 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4731 | disk->disk_name); | |
0909dc44 N |
4732 | error = 0; |
4733 | } | |
00bcb4ac N |
4734 | if (mddev->kobj.sd && |
4735 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4736 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4737 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4738 | abort: |
4739 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4740 | if (!error && mddev->kobj.sd) { |
3830c62f | 4741 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4742 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4743 | } |
d3374825 | 4744 | mddev_put(mddev); |
0909dc44 | 4745 | return error; |
efeb53c0 N |
4746 | } |
4747 | ||
4748 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4749 | { | |
4750 | md_alloc(dev, NULL); | |
1da177e4 LT |
4751 | return NULL; |
4752 | } | |
4753 | ||
efeb53c0 N |
4754 | static int add_named_array(const char *val, struct kernel_param *kp) |
4755 | { | |
4756 | /* val must be "md_*" where * is not all digits. | |
4757 | * We allocate an array with a large free minor number, and | |
4758 | * set the name to val. val must not already be an active name. | |
4759 | */ | |
4760 | int len = strlen(val); | |
4761 | char buf[DISK_NAME_LEN]; | |
4762 | ||
4763 | while (len && val[len-1] == '\n') | |
4764 | len--; | |
4765 | if (len >= DISK_NAME_LEN) | |
4766 | return -E2BIG; | |
4767 | strlcpy(buf, val, len+1); | |
4768 | if (strncmp(buf, "md_", 3) != 0) | |
4769 | return -EINVAL; | |
4770 | return md_alloc(0, buf); | |
4771 | } | |
4772 | ||
1da177e4 LT |
4773 | static void md_safemode_timeout(unsigned long data) |
4774 | { | |
fd01b88c | 4775 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 4776 | |
0fd62b86 NB |
4777 | if (!atomic_read(&mddev->writes_pending)) { |
4778 | mddev->safemode = 1; | |
4779 | if (mddev->external) | |
00bcb4ac | 4780 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4781 | } |
1da177e4 LT |
4782 | md_wakeup_thread(mddev->thread); |
4783 | } | |
4784 | ||
6ff8d8ec | 4785 | static int start_dirty_degraded; |
1da177e4 | 4786 | |
fd01b88c | 4787 | int md_run(struct mddev *mddev) |
1da177e4 | 4788 | { |
2604b703 | 4789 | int err; |
3cb03002 | 4790 | struct md_rdev *rdev; |
84fc4b56 | 4791 | struct md_personality *pers; |
1da177e4 | 4792 | |
a757e64c N |
4793 | if (list_empty(&mddev->disks)) |
4794 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4795 | return -EINVAL; |
1da177e4 LT |
4796 | |
4797 | if (mddev->pers) | |
4798 | return -EBUSY; | |
bb4f1e9d N |
4799 | /* Cannot run until previous stop completes properly */ |
4800 | if (mddev->sysfs_active) | |
4801 | return -EBUSY; | |
b6eb127d | 4802 | |
1da177e4 LT |
4803 | /* |
4804 | * Analyze all RAID superblock(s) | |
4805 | */ | |
1ec4a939 N |
4806 | if (!mddev->raid_disks) { |
4807 | if (!mddev->persistent) | |
4808 | return -EINVAL; | |
a757e64c | 4809 | analyze_sbs(mddev); |
1ec4a939 | 4810 | } |
1da177e4 | 4811 | |
d9d166c2 N |
4812 | if (mddev->level != LEVEL_NONE) |
4813 | request_module("md-level-%d", mddev->level); | |
4814 | else if (mddev->clevel[0]) | |
4815 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4816 | |
4817 | /* | |
4818 | * Drop all container device buffers, from now on | |
4819 | * the only valid external interface is through the md | |
4820 | * device. | |
1da177e4 | 4821 | */ |
dafb20fa | 4822 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 4823 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4824 | continue; |
4825 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4826 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4827 | |
4828 | /* perform some consistency tests on the device. | |
4829 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4830 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4831 | */ |
a6ff7e08 JB |
4832 | if (rdev->meta_bdev) { |
4833 | /* Nothing to check */; | |
4834 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4835 | if (mddev->dev_sectors && |
4836 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4837 | > rdev->sb_start) { |
f0d76d70 N |
4838 | printk("md: %s: data overlaps metadata\n", |
4839 | mdname(mddev)); | |
4840 | return -EINVAL; | |
4841 | } | |
4842 | } else { | |
0f420358 | 4843 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4844 | > rdev->data_offset) { |
4845 | printk("md: %s: metadata overlaps data\n", | |
4846 | mdname(mddev)); | |
4847 | return -EINVAL; | |
4848 | } | |
4849 | } | |
00bcb4ac | 4850 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4851 | } |
4852 | ||
a167f663 | 4853 | if (mddev->bio_set == NULL) |
395c72a7 | 4854 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 4855 | |
1da177e4 | 4856 | spin_lock(&pers_lock); |
d9d166c2 | 4857 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4858 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4859 | spin_unlock(&pers_lock); |
d9d166c2 N |
4860 | if (mddev->level != LEVEL_NONE) |
4861 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4862 | mddev->level); | |
4863 | else | |
4864 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4865 | mddev->clevel); | |
1da177e4 LT |
4866 | return -EINVAL; |
4867 | } | |
1da177e4 | 4868 | spin_unlock(&pers_lock); |
34817e8c N |
4869 | if (mddev->level != pers->level) { |
4870 | mddev->level = pers->level; | |
4871 | mddev->new_level = pers->level; | |
4872 | } | |
d9d166c2 | 4873 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4874 | |
f6705578 | 4875 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4876 | pers->start_reshape == NULL) { |
f6705578 | 4877 | /* This personality cannot handle reshaping... */ |
f6705578 N |
4878 | module_put(pers->owner); |
4879 | return -EINVAL; | |
4880 | } | |
4881 | ||
7dd5e7c3 N |
4882 | if (pers->sync_request) { |
4883 | /* Warn if this is a potentially silly | |
4884 | * configuration. | |
4885 | */ | |
4886 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 4887 | struct md_rdev *rdev2; |
7dd5e7c3 | 4888 | int warned = 0; |
159ec1fc | 4889 | |
dafb20fa N |
4890 | rdev_for_each(rdev, mddev) |
4891 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
4892 | if (rdev < rdev2 && |
4893 | rdev->bdev->bd_contains == | |
4894 | rdev2->bdev->bd_contains) { | |
4895 | printk(KERN_WARNING | |
4896 | "%s: WARNING: %s appears to be" | |
4897 | " on the same physical disk as" | |
4898 | " %s.\n", | |
4899 | mdname(mddev), | |
4900 | bdevname(rdev->bdev,b), | |
4901 | bdevname(rdev2->bdev,b2)); | |
4902 | warned = 1; | |
4903 | } | |
4904 | } | |
159ec1fc | 4905 | |
7dd5e7c3 N |
4906 | if (warned) |
4907 | printk(KERN_WARNING | |
4908 | "True protection against single-disk" | |
4909 | " failure might be compromised.\n"); | |
4910 | } | |
4911 | ||
657390d2 | 4912 | mddev->recovery = 0; |
58c0fed4 AN |
4913 | /* may be over-ridden by personality */ |
4914 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4915 | ||
6ff8d8ec | 4916 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4917 | |
0f9552b5 | 4918 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4919 | mddev->ro = 2; /* read-only, but switch on first write */ |
4920 | ||
36d091f4 | 4921 | err = pers->run(mddev); |
13e53df3 AN |
4922 | if (err) |
4923 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
36d091f4 | 4924 | else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { |
b522adcd DW |
4925 | WARN_ONCE(!mddev->external_size, "%s: default size too small," |
4926 | " but 'external_size' not in effect?\n", __func__); | |
4927 | printk(KERN_ERR | |
4928 | "md: invalid array_size %llu > default size %llu\n", | |
4929 | (unsigned long long)mddev->array_sectors / 2, | |
36d091f4 | 4930 | (unsigned long long)pers->size(mddev, 0, 0) / 2); |
b522adcd | 4931 | err = -EINVAL; |
b522adcd | 4932 | } |
36d091f4 | 4933 | if (err == 0 && pers->sync_request && |
ef99bf48 | 4934 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { |
b15c2e57 | 4935 | err = bitmap_create(mddev); |
5aa61f42 | 4936 | if (err) |
b15c2e57 N |
4937 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", |
4938 | mdname(mddev), err); | |
b15c2e57 | 4939 | } |
1da177e4 | 4940 | if (err) { |
5aa61f42 | 4941 | mddev_detach(mddev); |
36d091f4 N |
4942 | pers->free(mddev, mddev->private); |
4943 | module_put(pers->owner); | |
32a7627c N |
4944 | bitmap_destroy(mddev); |
4945 | return err; | |
1da177e4 | 4946 | } |
5c675f83 N |
4947 | if (mddev->queue) { |
4948 | mddev->queue->backing_dev_info.congested_data = mddev; | |
4949 | mddev->queue->backing_dev_info.congested_fn = md_congested; | |
64590f45 | 4950 | blk_queue_merge_bvec(mddev->queue, md_mergeable_bvec); |
5c675f83 | 4951 | } |
36d091f4 | 4952 | if (pers->sync_request) { |
00bcb4ac N |
4953 | if (mddev->kobj.sd && |
4954 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4955 | printk(KERN_WARNING |
4956 | "md: cannot register extra attributes for %s\n", | |
4957 | mdname(mddev)); | |
00bcb4ac | 4958 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4959 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4960 | mddev->ro = 0; |
4961 | ||
f72ffdd6 | 4962 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4963 | atomic_set(&mddev->max_corr_read_errors, |
4964 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4965 | mddev->safemode = 0; |
4966 | mddev->safemode_timer.function = md_safemode_timeout; | |
4967 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4968 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4969 | mddev->in_sync = 1; |
0ca69886 | 4970 | smp_wmb(); |
36d091f4 N |
4971 | spin_lock(&mddev->lock); |
4972 | mddev->pers = pers; | |
0ca69886 | 4973 | mddev->ready = 1; |
36d091f4 | 4974 | spin_unlock(&mddev->lock); |
dafb20fa | 4975 | rdev_for_each(rdev, mddev) |
36fad858 NK |
4976 | if (rdev->raid_disk >= 0) |
4977 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 4978 | /* failure here is OK */; |
f72ffdd6 | 4979 | |
1da177e4 | 4980 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 4981 | |
7a0a5355 | 4982 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 4983 | md_update_sb(mddev, 0); |
1da177e4 | 4984 | |
d7603b7e | 4985 | md_new_event(mddev); |
00bcb4ac N |
4986 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4987 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4988 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4989 | return 0; |
4990 | } | |
390ee602 | 4991 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4992 | |
fd01b88c | 4993 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
4994 | { |
4995 | int err; | |
4996 | ||
4997 | err = md_run(mddev); | |
4998 | if (err) | |
4999 | goto out; | |
69e51b44 N |
5000 | err = bitmap_load(mddev); |
5001 | if (err) { | |
5002 | bitmap_destroy(mddev); | |
5003 | goto out; | |
5004 | } | |
0fd018af JB |
5005 | |
5006 | md_wakeup_thread(mddev->thread); | |
5007 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5008 | ||
fe60b014 N |
5009 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5010 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5011 | mddev->changed = 1; |
fe60b014 N |
5012 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5013 | out: | |
5014 | return err; | |
5015 | } | |
5016 | ||
fd01b88c | 5017 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5018 | { |
5019 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5020 | |
80fab1d7 | 5021 | /* Complain if it has no devices */ |
1da177e4 | 5022 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5023 | return -ENXIO; |
5024 | if (!mddev->pers) | |
5025 | return -EINVAL; | |
5026 | if (!mddev->ro) | |
5027 | return -EBUSY; | |
5028 | mddev->safemode = 0; | |
5029 | mddev->ro = 0; | |
5030 | set_disk_ro(disk, 0); | |
5031 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5032 | mdname(mddev)); | |
5033 | /* Kick recovery or resync if necessary */ | |
5034 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5035 | md_wakeup_thread(mddev->thread); | |
5036 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5037 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5038 | return 0; |
1da177e4 LT |
5039 | } |
5040 | ||
fd01b88c | 5041 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5042 | { |
5043 | mddev->array_sectors = 0; | |
5044 | mddev->external_size = 0; | |
5045 | mddev->dev_sectors = 0; | |
5046 | mddev->raid_disks = 0; | |
5047 | mddev->recovery_cp = 0; | |
5048 | mddev->resync_min = 0; | |
5049 | mddev->resync_max = MaxSector; | |
5050 | mddev->reshape_position = MaxSector; | |
5051 | mddev->external = 0; | |
5052 | mddev->persistent = 0; | |
5053 | mddev->level = LEVEL_NONE; | |
5054 | mddev->clevel[0] = 0; | |
5055 | mddev->flags = 0; | |
5056 | mddev->ro = 0; | |
5057 | mddev->metadata_type[0] = 0; | |
5058 | mddev->chunk_sectors = 0; | |
5059 | mddev->ctime = mddev->utime = 0; | |
5060 | mddev->layout = 0; | |
5061 | mddev->max_disks = 0; | |
5062 | mddev->events = 0; | |
a8707c08 | 5063 | mddev->can_decrease_events = 0; |
6177b472 | 5064 | mddev->delta_disks = 0; |
2c810cdd | 5065 | mddev->reshape_backwards = 0; |
6177b472 N |
5066 | mddev->new_level = LEVEL_NONE; |
5067 | mddev->new_layout = 0; | |
5068 | mddev->new_chunk_sectors = 0; | |
5069 | mddev->curr_resync = 0; | |
7f7583d4 | 5070 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5071 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5072 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5073 | mddev->recovery = 0; | |
5074 | mddev->in_sync = 0; | |
f0b4f7e2 | 5075 | mddev->changed = 0; |
6177b472 | 5076 | mddev->degraded = 0; |
6177b472 | 5077 | mddev->safemode = 0; |
050b6615 | 5078 | mddev->merge_check_needed = 0; |
6177b472 N |
5079 | mddev->bitmap_info.offset = 0; |
5080 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5081 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5082 | mddev->bitmap_info.chunksize = 0; |
5083 | mddev->bitmap_info.daemon_sleep = 0; | |
5084 | mddev->bitmap_info.max_write_behind = 0; | |
5085 | } | |
5086 | ||
fd01b88c | 5087 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5088 | { |
6b6204ee | 5089 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5090 | flush_workqueue(md_misc_wq); |
a047e125 | 5091 | if (mddev->sync_thread) { |
a047e125 | 5092 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5093 | md_reap_sync_thread(mddev); |
a047e125 N |
5094 | } |
5095 | ||
5096 | del_timer_sync(&mddev->safemode_timer); | |
5097 | ||
5098 | bitmap_flush(mddev); | |
5099 | md_super_wait(mddev); | |
5100 | ||
b6d428c6 | 5101 | if (mddev->ro == 0 && |
7a0a5355 | 5102 | (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) { |
a047e125 N |
5103 | /* mark array as shutdown cleanly */ |
5104 | mddev->in_sync = 1; | |
5105 | md_update_sb(mddev, 1); | |
5106 | } | |
5107 | } | |
defad61a | 5108 | |
fd01b88c | 5109 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5110 | { |
29f097c4 | 5111 | mddev_lock_nointr(mddev); |
defad61a N |
5112 | __md_stop_writes(mddev); |
5113 | mddev_unlock(mddev); | |
5114 | } | |
390ee602 | 5115 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5116 | |
5aa61f42 N |
5117 | static void mddev_detach(struct mddev *mddev) |
5118 | { | |
5119 | struct bitmap *bitmap = mddev->bitmap; | |
5120 | /* wait for behind writes to complete */ | |
5121 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
5122 | printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n", | |
5123 | mdname(mddev)); | |
5124 | /* need to kick something here to make sure I/O goes? */ | |
5125 | wait_event(bitmap->behind_wait, | |
5126 | atomic_read(&bitmap->behind_writes) == 0); | |
5127 | } | |
36d091f4 | 5128 | if (mddev->pers && mddev->pers->quiesce) { |
5aa61f42 N |
5129 | mddev->pers->quiesce(mddev, 1); |
5130 | mddev->pers->quiesce(mddev, 0); | |
5131 | } | |
5132 | md_unregister_thread(&mddev->thread); | |
5133 | if (mddev->queue) | |
5134 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
5135 | } | |
5136 | ||
5eff3c43 | 5137 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5138 | { |
36d091f4 | 5139 | struct md_personality *pers = mddev->pers; |
5aa61f42 | 5140 | mddev_detach(mddev); |
36d091f4 N |
5141 | spin_lock(&mddev->lock); |
5142 | mddev->ready = 0; | |
6177b472 | 5143 | mddev->pers = NULL; |
36d091f4 N |
5144 | spin_unlock(&mddev->lock); |
5145 | pers->free(mddev, mddev->private); | |
5146 | if (pers->sync_request && mddev->to_remove == NULL) | |
5147 | mddev->to_remove = &md_redundancy_group; | |
5148 | module_put(pers->owner); | |
cca9cf90 | 5149 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5150 | } |
5eff3c43 N |
5151 | |
5152 | void md_stop(struct mddev *mddev) | |
5153 | { | |
5154 | /* stop the array and free an attached data structures. | |
5155 | * This is called from dm-raid | |
5156 | */ | |
5157 | __md_stop(mddev); | |
5158 | bitmap_destroy(mddev); | |
5159 | if (mddev->bio_set) | |
5160 | bioset_free(mddev->bio_set); | |
5161 | } | |
5162 | ||
390ee602 | 5163 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5164 | |
a05b7ea0 | 5165 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5166 | { |
5167 | int err = 0; | |
30b8feb7 N |
5168 | int did_freeze = 0; |
5169 | ||
5170 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5171 | did_freeze = 1; | |
5172 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5173 | md_wakeup_thread(mddev->thread); | |
5174 | } | |
f851b60d | 5175 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5176 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5177 | if (mddev->sync_thread) |
30b8feb7 N |
5178 | /* Thread might be blocked waiting for metadata update |
5179 | * which will now never happen */ | |
5180 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5181 | |
30b8feb7 | 5182 | mddev_unlock(mddev); |
f851b60d N |
5183 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5184 | &mddev->recovery)); | |
30b8feb7 N |
5185 | mddev_lock_nointr(mddev); |
5186 | ||
a4bd82d0 | 5187 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5188 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5189 | mddev->sync_thread || |
f851b60d | 5190 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5191 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
a4bd82d0 | 5192 | printk("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5193 | if (did_freeze) { |
5194 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5195 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5196 | md_wakeup_thread(mddev->thread); |
5197 | } | |
a4bd82d0 N |
5198 | err = -EBUSY; |
5199 | goto out; | |
5200 | } | |
5201 | if (mddev->pers) { | |
defad61a | 5202 | __md_stop_writes(mddev); |
a4bd82d0 N |
5203 | |
5204 | err = -ENXIO; | |
5205 | if (mddev->ro==1) | |
5206 | goto out; | |
5207 | mddev->ro = 1; | |
5208 | set_disk_ro(mddev->gendisk, 1); | |
5209 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5210 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5211 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5212 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5213 | err = 0; |
a4bd82d0 N |
5214 | } |
5215 | out: | |
5216 | mutex_unlock(&mddev->open_mutex); | |
5217 | return err; | |
5218 | } | |
5219 | ||
9e653b63 N |
5220 | /* mode: |
5221 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5222 | * 2 - stop but do not disassemble array |
5223 | */ | |
f72ffdd6 | 5224 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5225 | struct block_device *bdev) |
1da177e4 | 5226 | { |
1da177e4 | 5227 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5228 | struct md_rdev *rdev; |
30b8feb7 N |
5229 | int did_freeze = 0; |
5230 | ||
5231 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5232 | did_freeze = 1; | |
5233 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5234 | md_wakeup_thread(mddev->thread); | |
5235 | } | |
f851b60d | 5236 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5237 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5238 | if (mddev->sync_thread) |
30b8feb7 N |
5239 | /* Thread might be blocked waiting for metadata update |
5240 | * which will now never happen */ | |
5241 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5242 | |
30b8feb7 | 5243 | mddev_unlock(mddev); |
f851b60d N |
5244 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5245 | !test_bit(MD_RECOVERY_RUNNING, | |
5246 | &mddev->recovery))); | |
30b8feb7 | 5247 | mddev_lock_nointr(mddev); |
1da177e4 | 5248 | |
c8c00a69 | 5249 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5250 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5251 | mddev->sysfs_active || |
5252 | mddev->sync_thread || | |
f851b60d | 5253 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5254 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
df5b20cf | 5255 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5256 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5257 | if (did_freeze) { |
5258 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5259 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5260 | md_wakeup_thread(mddev->thread); |
5261 | } | |
260fa034 N |
5262 | return -EBUSY; |
5263 | } | |
6e17b027 | 5264 | if (mddev->pers) { |
a4bd82d0 N |
5265 | if (mddev->ro) |
5266 | set_disk_ro(disk, 0); | |
409c57f3 | 5267 | |
defad61a | 5268 | __md_stop_writes(mddev); |
5eff3c43 | 5269 | __md_stop(mddev); |
a4bd82d0 | 5270 | mddev->queue->merge_bvec_fn = NULL; |
a4bd82d0 | 5271 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5272 | |
a4bd82d0 | 5273 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5274 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5275 | |
dafb20fa | 5276 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5277 | if (rdev->raid_disk >= 0) |
5278 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5279 | |
a4bd82d0 | 5280 | set_capacity(disk, 0); |
6e17b027 | 5281 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5282 | mddev->changed = 1; |
a4bd82d0 | 5283 | revalidate_disk(disk); |
0d4ca600 | 5284 | |
a4bd82d0 N |
5285 | if (mddev->ro) |
5286 | mddev->ro = 0; | |
6e17b027 N |
5287 | } else |
5288 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5289 | /* |
5290 | * Free resources if final stop | |
5291 | */ | |
9e653b63 | 5292 | if (mode == 0) { |
1da177e4 LT |
5293 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5294 | ||
978f946b | 5295 | bitmap_destroy(mddev); |
c3d9714e | 5296 | if (mddev->bitmap_info.file) { |
4af1a041 N |
5297 | struct file *f = mddev->bitmap_info.file; |
5298 | spin_lock(&mddev->lock); | |
c3d9714e | 5299 | mddev->bitmap_info.file = NULL; |
4af1a041 N |
5300 | spin_unlock(&mddev->lock); |
5301 | fput(f); | |
978f946b | 5302 | } |
c3d9714e | 5303 | mddev->bitmap_info.offset = 0; |
978f946b | 5304 | |
1da177e4 LT |
5305 | export_array(mddev); |
5306 | ||
6177b472 | 5307 | md_clean(mddev); |
934d9c23 | 5308 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5309 | if (mddev->hold_active == UNTIL_STOP) |
5310 | mddev->hold_active = 0; | |
a4bd82d0 | 5311 | } |
3f9d99c1 | 5312 | blk_integrity_unregister(disk); |
d7603b7e | 5313 | md_new_event(mddev); |
00bcb4ac | 5314 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5315 | return 0; |
1da177e4 LT |
5316 | } |
5317 | ||
fdee8ae4 | 5318 | #ifndef MODULE |
fd01b88c | 5319 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5320 | { |
3cb03002 | 5321 | struct md_rdev *rdev; |
1da177e4 LT |
5322 | int err; |
5323 | ||
a757e64c | 5324 | if (list_empty(&mddev->disks)) |
1da177e4 | 5325 | return; |
1da177e4 LT |
5326 | |
5327 | printk(KERN_INFO "md: running: "); | |
5328 | ||
dafb20fa | 5329 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5330 | char b[BDEVNAME_SIZE]; |
5331 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5332 | } | |
5333 | printk("\n"); | |
5334 | ||
d710e138 | 5335 | err = do_md_run(mddev); |
1da177e4 LT |
5336 | if (err) { |
5337 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5338 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5339 | } |
5340 | } | |
5341 | ||
5342 | /* | |
5343 | * lets try to run arrays based on all disks that have arrived | |
5344 | * until now. (those are in pending_raid_disks) | |
5345 | * | |
5346 | * the method: pick the first pending disk, collect all disks with | |
5347 | * the same UUID, remove all from the pending list and put them into | |
5348 | * the 'same_array' list. Then order this list based on superblock | |
5349 | * update time (freshest comes first), kick out 'old' disks and | |
5350 | * compare superblocks. If everything's fine then run it. | |
5351 | * | |
5352 | * If "unit" is allocated, then bump its reference count | |
5353 | */ | |
5354 | static void autorun_devices(int part) | |
5355 | { | |
3cb03002 | 5356 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5357 | struct mddev *mddev; |
1da177e4 LT |
5358 | char b[BDEVNAME_SIZE]; |
5359 | ||
5360 | printk(KERN_INFO "md: autorun ...\n"); | |
5361 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5362 | int unit; |
1da177e4 | 5363 | dev_t dev; |
ad01c9e3 | 5364 | LIST_HEAD(candidates); |
1da177e4 | 5365 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5366 | struct md_rdev, same_set); |
1da177e4 LT |
5367 | |
5368 | printk(KERN_INFO "md: considering %s ...\n", | |
5369 | bdevname(rdev0->bdev,b)); | |
5370 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5371 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5372 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5373 | printk(KERN_INFO "md: adding %s ...\n", | |
5374 | bdevname(rdev->bdev,b)); | |
5375 | list_move(&rdev->same_set, &candidates); | |
5376 | } | |
5377 | /* | |
5378 | * now we have a set of devices, with all of them having | |
5379 | * mostly sane superblocks. It's time to allocate the | |
5380 | * mddev. | |
5381 | */ | |
e8703fe1 N |
5382 | if (part) { |
5383 | dev = MKDEV(mdp_major, | |
5384 | rdev0->preferred_minor << MdpMinorShift); | |
5385 | unit = MINOR(dev) >> MdpMinorShift; | |
5386 | } else { | |
5387 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5388 | unit = MINOR(dev); | |
5389 | } | |
5390 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5391 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5392 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5393 | break; | |
5394 | } | |
1da177e4 LT |
5395 | |
5396 | md_probe(dev, NULL, NULL); | |
5397 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5398 | if (!mddev || !mddev->gendisk) { |
5399 | if (mddev) | |
5400 | mddev_put(mddev); | |
5401 | printk(KERN_ERR | |
1da177e4 LT |
5402 | "md: cannot allocate memory for md drive.\n"); |
5403 | break; | |
5404 | } | |
f72ffdd6 | 5405 | if (mddev_lock(mddev)) |
1da177e4 LT |
5406 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
5407 | mdname(mddev)); | |
5408 | else if (mddev->raid_disks || mddev->major_version | |
5409 | || !list_empty(&mddev->disks)) { | |
f72ffdd6 | 5410 | printk(KERN_WARNING |
1da177e4 LT |
5411 | "md: %s already running, cannot run %s\n", |
5412 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5413 | mddev_unlock(mddev); | |
5414 | } else { | |
5415 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5416 | mddev->persistent = 1; |
159ec1fc | 5417 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5418 | list_del_init(&rdev->same_set); |
5419 | if (bind_rdev_to_array(rdev, mddev)) | |
5420 | export_rdev(rdev); | |
5421 | } | |
5422 | autorun_array(mddev); | |
5423 | mddev_unlock(mddev); | |
5424 | } | |
5425 | /* on success, candidates will be empty, on error | |
5426 | * it won't... | |
5427 | */ | |
159ec1fc | 5428 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5429 | list_del_init(&rdev->same_set); |
1da177e4 | 5430 | export_rdev(rdev); |
4b80991c | 5431 | } |
1da177e4 LT |
5432 | mddev_put(mddev); |
5433 | } | |
5434 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5435 | } | |
fdee8ae4 | 5436 | #endif /* !MODULE */ |
1da177e4 | 5437 | |
f72ffdd6 | 5438 | static int get_version(void __user *arg) |
1da177e4 LT |
5439 | { |
5440 | mdu_version_t ver; | |
5441 | ||
5442 | ver.major = MD_MAJOR_VERSION; | |
5443 | ver.minor = MD_MINOR_VERSION; | |
5444 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5445 | ||
5446 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5447 | return -EFAULT; | |
5448 | ||
5449 | return 0; | |
5450 | } | |
5451 | ||
f72ffdd6 | 5452 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
5453 | { |
5454 | mdu_array_info_t info; | |
a9f326eb | 5455 | int nr,working,insync,failed,spare; |
3cb03002 | 5456 | struct md_rdev *rdev; |
1da177e4 | 5457 | |
1ca69c4b N |
5458 | nr = working = insync = failed = spare = 0; |
5459 | rcu_read_lock(); | |
5460 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5461 | nr++; |
b2d444d7 | 5462 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5463 | failed++; |
5464 | else { | |
5465 | working++; | |
b2d444d7 | 5466 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 5467 | insync++; |
1da177e4 LT |
5468 | else |
5469 | spare++; | |
5470 | } | |
5471 | } | |
1ca69c4b | 5472 | rcu_read_unlock(); |
1da177e4 LT |
5473 | |
5474 | info.major_version = mddev->major_version; | |
5475 | info.minor_version = mddev->minor_version; | |
5476 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5477 | info.ctime = mddev->ctime; | |
5478 | info.level = mddev->level; | |
58c0fed4 AN |
5479 | info.size = mddev->dev_sectors / 2; |
5480 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5481 | info.size = -1; |
1da177e4 LT |
5482 | info.nr_disks = nr; |
5483 | info.raid_disks = mddev->raid_disks; | |
5484 | info.md_minor = mddev->md_minor; | |
5485 | info.not_persistent= !mddev->persistent; | |
5486 | ||
5487 | info.utime = mddev->utime; | |
5488 | info.state = 0; | |
5489 | if (mddev->in_sync) | |
5490 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5491 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 5492 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5493 | info.active_disks = insync; |
1da177e4 LT |
5494 | info.working_disks = working; |
5495 | info.failed_disks = failed; | |
5496 | info.spare_disks = spare; | |
5497 | ||
5498 | info.layout = mddev->layout; | |
9d8f0363 | 5499 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5500 | |
5501 | if (copy_to_user(arg, &info, sizeof(info))) | |
5502 | return -EFAULT; | |
5503 | ||
5504 | return 0; | |
5505 | } | |
5506 | ||
f72ffdd6 | 5507 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
5508 | { |
5509 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
f4ad3d38 | 5510 | char *ptr; |
4af1a041 | 5511 | int err; |
32a7627c | 5512 | |
60559da4 | 5513 | file = kmalloc(sizeof(*file), GFP_NOIO); |
32a7627c | 5514 | if (!file) |
4af1a041 | 5515 | return -ENOMEM; |
32a7627c | 5516 | |
4af1a041 N |
5517 | err = 0; |
5518 | spin_lock(&mddev->lock); | |
32a7627c | 5519 | /* bitmap disabled, zero the first byte and copy out */ |
4af1a041 | 5520 | if (!mddev->bitmap_info.file) |
32a7627c | 5521 | file->pathname[0] = '\0'; |
4af1a041 N |
5522 | else if ((ptr = d_path(&mddev->bitmap_info.file->f_path, |
5523 | file->pathname, sizeof(file->pathname))), | |
5524 | IS_ERR(ptr)) | |
5525 | err = PTR_ERR(ptr); | |
5526 | else | |
5527 | memmove(file->pathname, ptr, | |
5528 | sizeof(file->pathname)-(ptr-file->pathname)); | |
5529 | spin_unlock(&mddev->lock); | |
32a7627c | 5530 | |
4af1a041 N |
5531 | if (err == 0 && |
5532 | copy_to_user(arg, file, sizeof(*file))) | |
32a7627c | 5533 | err = -EFAULT; |
4af1a041 | 5534 | |
32a7627c N |
5535 | kfree(file); |
5536 | return err; | |
5537 | } | |
5538 | ||
f72ffdd6 | 5539 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
5540 | { |
5541 | mdu_disk_info_t info; | |
3cb03002 | 5542 | struct md_rdev *rdev; |
1da177e4 LT |
5543 | |
5544 | if (copy_from_user(&info, arg, sizeof(info))) | |
5545 | return -EFAULT; | |
5546 | ||
1ca69c4b N |
5547 | rcu_read_lock(); |
5548 | rdev = find_rdev_nr_rcu(mddev, info.number); | |
1da177e4 LT |
5549 | if (rdev) { |
5550 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5551 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5552 | info.raid_disk = rdev->raid_disk; | |
5553 | info.state = 0; | |
b2d444d7 | 5554 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5555 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5556 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5557 | info.state |= (1<<MD_DISK_ACTIVE); |
5558 | info.state |= (1<<MD_DISK_SYNC); | |
5559 | } | |
8ddf9efe N |
5560 | if (test_bit(WriteMostly, &rdev->flags)) |
5561 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5562 | } else { |
5563 | info.major = info.minor = 0; | |
5564 | info.raid_disk = -1; | |
5565 | info.state = (1<<MD_DISK_REMOVED); | |
5566 | } | |
1ca69c4b | 5567 | rcu_read_unlock(); |
1da177e4 LT |
5568 | |
5569 | if (copy_to_user(arg, &info, sizeof(info))) | |
5570 | return -EFAULT; | |
5571 | ||
5572 | return 0; | |
5573 | } | |
5574 | ||
f72ffdd6 | 5575 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5576 | { |
5577 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5578 | struct md_rdev *rdev; |
1da177e4 LT |
5579 | dev_t dev = MKDEV(info->major,info->minor); |
5580 | ||
5581 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5582 | return -EOVERFLOW; | |
5583 | ||
5584 | if (!mddev->raid_disks) { | |
5585 | int err; | |
5586 | /* expecting a device which has a superblock */ | |
5587 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5588 | if (IS_ERR(rdev)) { | |
f72ffdd6 | 5589 | printk(KERN_WARNING |
1da177e4 LT |
5590 | "md: md_import_device returned %ld\n", |
5591 | PTR_ERR(rdev)); | |
5592 | return PTR_ERR(rdev); | |
5593 | } | |
5594 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5595 | struct md_rdev *rdev0 |
5596 | = list_entry(mddev->disks.next, | |
5597 | struct md_rdev, same_set); | |
a9f326eb | 5598 | err = super_types[mddev->major_version] |
1da177e4 LT |
5599 | .load_super(rdev, rdev0, mddev->minor_version); |
5600 | if (err < 0) { | |
f72ffdd6 | 5601 | printk(KERN_WARNING |
1da177e4 | 5602 | "md: %s has different UUID to %s\n", |
f72ffdd6 | 5603 | bdevname(rdev->bdev,b), |
1da177e4 LT |
5604 | bdevname(rdev0->bdev,b2)); |
5605 | export_rdev(rdev); | |
5606 | return -EINVAL; | |
5607 | } | |
5608 | } | |
5609 | err = bind_rdev_to_array(rdev, mddev); | |
5610 | if (err) | |
5611 | export_rdev(rdev); | |
5612 | return err; | |
5613 | } | |
5614 | ||
5615 | /* | |
5616 | * add_new_disk can be used once the array is assembled | |
5617 | * to add "hot spares". They must already have a superblock | |
5618 | * written | |
5619 | */ | |
5620 | if (mddev->pers) { | |
5621 | int err; | |
5622 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5623 | printk(KERN_WARNING |
1da177e4 LT |
5624 | "%s: personality does not support diskops!\n", |
5625 | mdname(mddev)); | |
5626 | return -EINVAL; | |
5627 | } | |
7b1e35f6 N |
5628 | if (mddev->persistent) |
5629 | rdev = md_import_device(dev, mddev->major_version, | |
5630 | mddev->minor_version); | |
5631 | else | |
5632 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 5633 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5634 | printk(KERN_WARNING |
1da177e4 LT |
5635 | "md: md_import_device returned %ld\n", |
5636 | PTR_ERR(rdev)); | |
5637 | return PTR_ERR(rdev); | |
5638 | } | |
1a855a06 | 5639 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5640 | if (!mddev->persistent) { |
5641 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5642 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5643 | rdev->raid_disk = info->raid_disk; |
bf572541 | 5644 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 5645 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 5646 | } else |
41158c7e | 5647 | rdev->raid_disk = -1; |
f466722c | 5648 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
5649 | } else |
5650 | super_types[mddev->major_version]. | |
5651 | validate_super(mddev, rdev); | |
bedd86b7 | 5652 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 5653 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
5654 | /* This was a hot-add request, but events doesn't |
5655 | * match, so reject it. | |
5656 | */ | |
5657 | export_rdev(rdev); | |
5658 | return -EINVAL; | |
5659 | } | |
5660 | ||
b2d444d7 | 5661 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5662 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5663 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5664 | else |
5665 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5666 | |
1da177e4 LT |
5667 | rdev->raid_disk = -1; |
5668 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5669 | if (!err && !mddev->pers->hot_remove_disk) { |
5670 | /* If there is hot_add_disk but no hot_remove_disk | |
5671 | * then added disks for geometry changes, | |
5672 | * and should be added immediately. | |
5673 | */ | |
5674 | super_types[mddev->major_version]. | |
5675 | validate_super(mddev, rdev); | |
5676 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5677 | if (err) | |
5678 | unbind_rdev_from_array(rdev); | |
5679 | } | |
1da177e4 LT |
5680 | if (err) |
5681 | export_rdev(rdev); | |
52664732 | 5682 | else |
00bcb4ac | 5683 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5684 | |
7ceb17e8 | 5685 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
72a23c21 NB |
5686 | if (mddev->degraded) |
5687 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5688 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5689 | if (!err) |
5690 | md_new_event(mddev); | |
005eca5e | 5691 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5692 | return err; |
5693 | } | |
5694 | ||
5695 | /* otherwise, add_new_disk is only allowed | |
5696 | * for major_version==0 superblocks | |
5697 | */ | |
5698 | if (mddev->major_version != 0) { | |
5699 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5700 | mdname(mddev)); | |
5701 | return -EINVAL; | |
5702 | } | |
5703 | ||
5704 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5705 | int err; | |
d710e138 | 5706 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5707 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5708 | printk(KERN_WARNING |
1da177e4 LT |
5709 | "md: error, md_import_device() returned %ld\n", |
5710 | PTR_ERR(rdev)); | |
5711 | return PTR_ERR(rdev); | |
5712 | } | |
5713 | rdev->desc_nr = info->number; | |
5714 | if (info->raid_disk < mddev->raid_disks) | |
5715 | rdev->raid_disk = info->raid_disk; | |
5716 | else | |
5717 | rdev->raid_disk = -1; | |
5718 | ||
1da177e4 | 5719 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5720 | if (info->state & (1<<MD_DISK_SYNC)) |
5721 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5722 | |
8ddf9efe N |
5723 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5724 | set_bit(WriteMostly, &rdev->flags); | |
5725 | ||
1da177e4 LT |
5726 | if (!mddev->persistent) { |
5727 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5728 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5729 | } else | |
57b2caa3 | 5730 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5731 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5732 | |
2bf071bf N |
5733 | err = bind_rdev_to_array(rdev, mddev); |
5734 | if (err) { | |
5735 | export_rdev(rdev); | |
5736 | return err; | |
5737 | } | |
1da177e4 LT |
5738 | } |
5739 | ||
5740 | return 0; | |
5741 | } | |
5742 | ||
f72ffdd6 | 5743 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5744 | { |
5745 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 5746 | struct md_rdev *rdev; |
1da177e4 | 5747 | |
1da177e4 LT |
5748 | rdev = find_rdev(mddev, dev); |
5749 | if (!rdev) | |
5750 | return -ENXIO; | |
5751 | ||
3ea8929d N |
5752 | clear_bit(Blocked, &rdev->flags); |
5753 | remove_and_add_spares(mddev, rdev); | |
5754 | ||
1da177e4 LT |
5755 | if (rdev->raid_disk >= 0) |
5756 | goto busy; | |
5757 | ||
5758 | kick_rdev_from_array(rdev); | |
850b2b42 | 5759 | md_update_sb(mddev, 1); |
d7603b7e | 5760 | md_new_event(mddev); |
1da177e4 LT |
5761 | |
5762 | return 0; | |
5763 | busy: | |
fdefa4d8 | 5764 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5765 | bdevname(rdev->bdev,b), mdname(mddev)); |
5766 | return -EBUSY; | |
5767 | } | |
5768 | ||
f72ffdd6 | 5769 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
5770 | { |
5771 | char b[BDEVNAME_SIZE]; | |
5772 | int err; | |
3cb03002 | 5773 | struct md_rdev *rdev; |
1da177e4 LT |
5774 | |
5775 | if (!mddev->pers) | |
5776 | return -ENODEV; | |
5777 | ||
5778 | if (mddev->major_version != 0) { | |
5779 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5780 | " version-0 superblocks.\n", | |
5781 | mdname(mddev)); | |
5782 | return -EINVAL; | |
5783 | } | |
5784 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5785 | printk(KERN_WARNING |
1da177e4 LT |
5786 | "%s: personality does not support diskops!\n", |
5787 | mdname(mddev)); | |
5788 | return -EINVAL; | |
5789 | } | |
5790 | ||
d710e138 | 5791 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5792 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5793 | printk(KERN_WARNING |
1da177e4 LT |
5794 | "md: error, md_import_device() returned %ld\n", |
5795 | PTR_ERR(rdev)); | |
5796 | return -EINVAL; | |
5797 | } | |
5798 | ||
5799 | if (mddev->persistent) | |
57b2caa3 | 5800 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5801 | else |
77304d2a | 5802 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5803 | |
8190e754 | 5804 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5805 | |
b2d444d7 | 5806 | if (test_bit(Faulty, &rdev->flags)) { |
f72ffdd6 | 5807 | printk(KERN_WARNING |
1da177e4 LT |
5808 | "md: can not hot-add faulty %s disk to %s!\n", |
5809 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5810 | err = -EINVAL; | |
5811 | goto abort_export; | |
5812 | } | |
b2d444d7 | 5813 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5814 | rdev->desc_nr = -1; |
5842730d | 5815 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5816 | err = bind_rdev_to_array(rdev, mddev); |
5817 | if (err) | |
5818 | goto abort_export; | |
1da177e4 LT |
5819 | |
5820 | /* | |
5821 | * The rest should better be atomic, we can have disk failures | |
5822 | * noticed in interrupt contexts ... | |
5823 | */ | |
5824 | ||
1da177e4 LT |
5825 | rdev->raid_disk = -1; |
5826 | ||
850b2b42 | 5827 | md_update_sb(mddev, 1); |
1da177e4 LT |
5828 | |
5829 | /* | |
5830 | * Kick recovery, maybe this spare has to be added to the | |
5831 | * array immediately. | |
5832 | */ | |
5833 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5834 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5835 | md_new_event(mddev); |
1da177e4 LT |
5836 | return 0; |
5837 | ||
1da177e4 LT |
5838 | abort_export: |
5839 | export_rdev(rdev); | |
5840 | return err; | |
5841 | } | |
5842 | ||
fd01b88c | 5843 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 5844 | { |
035328c2 | 5845 | int err = 0; |
32a7627c | 5846 | |
36fa3063 | 5847 | if (mddev->pers) { |
d66b1b39 | 5848 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
5849 | return -EBUSY; |
5850 | if (mddev->recovery || mddev->sync_thread) | |
5851 | return -EBUSY; | |
5852 | /* we should be able to change the bitmap.. */ | |
5853 | } | |
32a7627c | 5854 | |
36fa3063 | 5855 | if (fd >= 0) { |
035328c2 | 5856 | struct inode *inode; |
1e594bb2 N |
5857 | struct file *f; |
5858 | ||
5859 | if (mddev->bitmap || mddev->bitmap_info.file) | |
36fa3063 | 5860 | return -EEXIST; /* cannot add when bitmap is present */ |
1e594bb2 | 5861 | f = fget(fd); |
32a7627c | 5862 | |
1e594bb2 | 5863 | if (f == NULL) { |
36fa3063 N |
5864 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5865 | mdname(mddev)); | |
5866 | return -EBADF; | |
5867 | } | |
5868 | ||
1e594bb2 | 5869 | inode = f->f_mapping->host; |
035328c2 N |
5870 | if (!S_ISREG(inode->i_mode)) { |
5871 | printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", | |
5872 | mdname(mddev)); | |
5873 | err = -EBADF; | |
1e594bb2 | 5874 | } else if (!(f->f_mode & FMODE_WRITE)) { |
035328c2 N |
5875 | printk(KERN_ERR "%s: error: bitmap file must open for write\n", |
5876 | mdname(mddev)); | |
5877 | err = -EBADF; | |
5878 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
36fa3063 N |
5879 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
5880 | mdname(mddev)); | |
035328c2 N |
5881 | err = -EBUSY; |
5882 | } | |
5883 | if (err) { | |
1e594bb2 | 5884 | fput(f); |
36fa3063 N |
5885 | return err; |
5886 | } | |
1e594bb2 | 5887 | mddev->bitmap_info.file = f; |
c3d9714e | 5888 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5889 | } else if (mddev->bitmap == NULL) |
5890 | return -ENOENT; /* cannot remove what isn't there */ | |
5891 | err = 0; | |
5892 | if (mddev->pers) { | |
5893 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5894 | if (fd >= 0) { |
36fa3063 | 5895 | err = bitmap_create(mddev); |
69e51b44 N |
5896 | if (!err) |
5897 | err = bitmap_load(mddev); | |
5898 | } | |
d7375ab3 | 5899 | if (fd < 0 || err) { |
36fa3063 | 5900 | bitmap_destroy(mddev); |
d7375ab3 N |
5901 | fd = -1; /* make sure to put the file */ |
5902 | } | |
36fa3063 | 5903 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5904 | } |
5905 | if (fd < 0) { | |
4af1a041 N |
5906 | struct file *f = mddev->bitmap_info.file; |
5907 | if (f) { | |
5908 | spin_lock(&mddev->lock); | |
5909 | mddev->bitmap_info.file = NULL; | |
5910 | spin_unlock(&mddev->lock); | |
5911 | fput(f); | |
5912 | } | |
36fa3063 N |
5913 | } |
5914 | ||
32a7627c N |
5915 | return err; |
5916 | } | |
5917 | ||
1da177e4 LT |
5918 | /* |
5919 | * set_array_info is used two different ways | |
5920 | * The original usage is when creating a new array. | |
5921 | * In this usage, raid_disks is > 0 and it together with | |
5922 | * level, size, not_persistent,layout,chunksize determine the | |
5923 | * shape of the array. | |
5924 | * This will always create an array with a type-0.90.0 superblock. | |
5925 | * The newer usage is when assembling an array. | |
5926 | * In this case raid_disks will be 0, and the major_version field is | |
5927 | * use to determine which style super-blocks are to be found on the devices. | |
5928 | * The minor and patch _version numbers are also kept incase the | |
5929 | * super_block handler wishes to interpret them. | |
5930 | */ | |
f72ffdd6 | 5931 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
5932 | { |
5933 | ||
5934 | if (info->raid_disks == 0) { | |
5935 | /* just setting version number for superblock loading */ | |
5936 | if (info->major_version < 0 || | |
50511da3 | 5937 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5938 | super_types[info->major_version].name == NULL) { |
5939 | /* maybe try to auto-load a module? */ | |
f72ffdd6 | 5940 | printk(KERN_INFO |
1da177e4 LT |
5941 | "md: superblock version %d not known\n", |
5942 | info->major_version); | |
5943 | return -EINVAL; | |
5944 | } | |
5945 | mddev->major_version = info->major_version; | |
5946 | mddev->minor_version = info->minor_version; | |
5947 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5948 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5949 | /* ensure mddev_put doesn't delete this now that there |
5950 | * is some minimal configuration. | |
5951 | */ | |
5952 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5953 | return 0; |
5954 | } | |
5955 | mddev->major_version = MD_MAJOR_VERSION; | |
5956 | mddev->minor_version = MD_MINOR_VERSION; | |
5957 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5958 | mddev->ctime = get_seconds(); | |
5959 | ||
5960 | mddev->level = info->level; | |
17115e03 | 5961 | mddev->clevel[0] = 0; |
58c0fed4 | 5962 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5963 | mddev->raid_disks = info->raid_disks; |
5964 | /* don't set md_minor, it is determined by which /dev/md* was | |
5965 | * openned | |
5966 | */ | |
5967 | if (info->state & (1<<MD_SB_CLEAN)) | |
5968 | mddev->recovery_cp = MaxSector; | |
5969 | else | |
5970 | mddev->recovery_cp = 0; | |
5971 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5972 | mddev->external = 0; |
1da177e4 LT |
5973 | |
5974 | mddev->layout = info->layout; | |
9d8f0363 | 5975 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5976 | |
5977 | mddev->max_disks = MD_SB_DISKS; | |
5978 | ||
e691063a N |
5979 | if (mddev->persistent) |
5980 | mddev->flags = 0; | |
850b2b42 | 5981 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5982 | |
c3d9714e | 5983 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 5984 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 5985 | mddev->bitmap_info.offset = 0; |
b2a2703c | 5986 | |
f6705578 N |
5987 | mddev->reshape_position = MaxSector; |
5988 | ||
1da177e4 LT |
5989 | /* |
5990 | * Generate a 128 bit UUID | |
5991 | */ | |
5992 | get_random_bytes(mddev->uuid, 16); | |
5993 | ||
f6705578 | 5994 | mddev->new_level = mddev->level; |
664e7c41 | 5995 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5996 | mddev->new_layout = mddev->layout; |
5997 | mddev->delta_disks = 0; | |
2c810cdd | 5998 | mddev->reshape_backwards = 0; |
f6705578 | 5999 | |
1da177e4 LT |
6000 | return 0; |
6001 | } | |
6002 | ||
fd01b88c | 6003 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 6004 | { |
b522adcd DW |
6005 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
6006 | ||
6007 | if (mddev->external_size) | |
6008 | return; | |
6009 | ||
1f403624 DW |
6010 | mddev->array_sectors = array_sectors; |
6011 | } | |
6012 | EXPORT_SYMBOL(md_set_array_sectors); | |
6013 | ||
fd01b88c | 6014 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6015 | { |
3cb03002 | 6016 | struct md_rdev *rdev; |
a35b0d69 | 6017 | int rv; |
d71f9f88 | 6018 | int fit = (num_sectors == 0); |
a35b0d69 N |
6019 | |
6020 | if (mddev->pers->resize == NULL) | |
6021 | return -EINVAL; | |
d71f9f88 AN |
6022 | /* The "num_sectors" is the number of sectors of each device that |
6023 | * is used. This can only make sense for arrays with redundancy. | |
6024 | * linear and raid0 always use whatever space is available. We can only | |
6025 | * consider changing this number if no resync or reconstruction is | |
6026 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6027 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6028 | * of each device. If num_sectors is zero, we find the largest size |
6029 | * that fits. | |
a35b0d69 | 6030 | */ |
f851b60d N |
6031 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
6032 | mddev->sync_thread) | |
a35b0d69 | 6033 | return -EBUSY; |
bd8839e0 N |
6034 | if (mddev->ro) |
6035 | return -EROFS; | |
a4a6125a | 6036 | |
dafb20fa | 6037 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6038 | sector_t avail = rdev->sectors; |
01ab5662 | 6039 | |
d71f9f88 AN |
6040 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6041 | num_sectors = avail; | |
6042 | if (avail < num_sectors) | |
a35b0d69 N |
6043 | return -ENOSPC; |
6044 | } | |
d71f9f88 | 6045 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6046 | if (!rv) |
6047 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6048 | return rv; |
6049 | } | |
6050 | ||
fd01b88c | 6051 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6052 | { |
6053 | int rv; | |
c6563a8c | 6054 | struct md_rdev *rdev; |
da943b99 | 6055 | /* change the number of raid disks */ |
63c70c4f | 6056 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6057 | return -EINVAL; |
bd8839e0 N |
6058 | if (mddev->ro) |
6059 | return -EROFS; | |
da943b99 | 6060 | if (raid_disks <= 0 || |
233fca36 | 6061 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6062 | return -EINVAL; |
f851b60d N |
6063 | if (mddev->sync_thread || |
6064 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6065 | mddev->reshape_position != MaxSector) | |
da943b99 | 6066 | return -EBUSY; |
c6563a8c N |
6067 | |
6068 | rdev_for_each(rdev, mddev) { | |
6069 | if (mddev->raid_disks < raid_disks && | |
6070 | rdev->data_offset < rdev->new_data_offset) | |
6071 | return -EINVAL; | |
6072 | if (mddev->raid_disks > raid_disks && | |
6073 | rdev->data_offset > rdev->new_data_offset) | |
6074 | return -EINVAL; | |
6075 | } | |
6076 | ||
63c70c4f | 6077 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6078 | if (mddev->delta_disks < 0) |
6079 | mddev->reshape_backwards = 1; | |
6080 | else if (mddev->delta_disks > 0) | |
6081 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6082 | |
6083 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6084 | if (rv < 0) { |
de171cb9 | 6085 | mddev->delta_disks = 0; |
2c810cdd N |
6086 | mddev->reshape_backwards = 0; |
6087 | } | |
da943b99 N |
6088 | return rv; |
6089 | } | |
6090 | ||
1da177e4 LT |
6091 | /* |
6092 | * update_array_info is used to change the configuration of an | |
6093 | * on-line array. | |
6094 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6095 | * fields in the info are checked against the array. | |
6096 | * Any differences that cannot be handled will cause an error. | |
6097 | * Normally, only one change can be managed at a time. | |
6098 | */ | |
fd01b88c | 6099 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6100 | { |
6101 | int rv = 0; | |
6102 | int cnt = 0; | |
36fa3063 N |
6103 | int state = 0; |
6104 | ||
6105 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6106 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6107 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6108 | |
6109 | if (mddev->major_version != info->major_version || | |
6110 | mddev->minor_version != info->minor_version || | |
6111 | /* mddev->patch_version != info->patch_version || */ | |
6112 | mddev->ctime != info->ctime || | |
6113 | mddev->level != info->level || | |
6114 | /* mddev->layout != info->layout || */ | |
6115 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 6116 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6117 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6118 | ((state^info->state) & 0xfffffe00) | |
6119 | ) | |
1da177e4 LT |
6120 | return -EINVAL; |
6121 | /* Check there is only one change */ | |
58c0fed4 AN |
6122 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6123 | cnt++; | |
6124 | if (mddev->raid_disks != info->raid_disks) | |
6125 | cnt++; | |
6126 | if (mddev->layout != info->layout) | |
6127 | cnt++; | |
6128 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6129 | cnt++; | |
6130 | if (cnt == 0) | |
6131 | return 0; | |
6132 | if (cnt > 1) | |
6133 | return -EINVAL; | |
1da177e4 LT |
6134 | |
6135 | if (mddev->layout != info->layout) { | |
6136 | /* Change layout | |
6137 | * we don't need to do anything at the md level, the | |
6138 | * personality will take care of it all. | |
6139 | */ | |
50ac168a | 6140 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6141 | return -EINVAL; |
597a711b N |
6142 | else { |
6143 | mddev->new_layout = info->layout; | |
50ac168a | 6144 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6145 | if (rv) |
6146 | mddev->new_layout = mddev->layout; | |
6147 | return rv; | |
6148 | } | |
1da177e4 | 6149 | } |
58c0fed4 | 6150 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6151 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6152 | |
da943b99 N |
6153 | if (mddev->raid_disks != info->raid_disks) |
6154 | rv = update_raid_disks(mddev, info->raid_disks); | |
6155 | ||
36fa3063 | 6156 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
d66b1b39 | 6157 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) |
36fa3063 N |
6158 | return -EINVAL; |
6159 | if (mddev->recovery || mddev->sync_thread) | |
6160 | return -EBUSY; | |
6161 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
6162 | /* add the bitmap */ | |
6163 | if (mddev->bitmap) | |
6164 | return -EEXIST; | |
c3d9714e | 6165 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 6166 | return -EINVAL; |
c3d9714e N |
6167 | mddev->bitmap_info.offset = |
6168 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6169 | mddev->bitmap_info.space = |
6170 | mddev->bitmap_info.default_space; | |
36fa3063 N |
6171 | mddev->pers->quiesce(mddev, 1); |
6172 | rv = bitmap_create(mddev); | |
69e51b44 N |
6173 | if (!rv) |
6174 | rv = bitmap_load(mddev); | |
36fa3063 N |
6175 | if (rv) |
6176 | bitmap_destroy(mddev); | |
6177 | mddev->pers->quiesce(mddev, 0); | |
6178 | } else { | |
6179 | /* remove the bitmap */ | |
6180 | if (!mddev->bitmap) | |
6181 | return -ENOENT; | |
1ec885cd | 6182 | if (mddev->bitmap->storage.file) |
36fa3063 N |
6183 | return -EINVAL; |
6184 | mddev->pers->quiesce(mddev, 1); | |
6185 | bitmap_destroy(mddev); | |
6186 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6187 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6188 | } |
6189 | } | |
850b2b42 | 6190 | md_update_sb(mddev, 1); |
1da177e4 LT |
6191 | return rv; |
6192 | } | |
6193 | ||
fd01b88c | 6194 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6195 | { |
3cb03002 | 6196 | struct md_rdev *rdev; |
1ca69c4b | 6197 | int err = 0; |
1da177e4 LT |
6198 | |
6199 | if (mddev->pers == NULL) | |
6200 | return -ENODEV; | |
6201 | ||
1ca69c4b N |
6202 | rcu_read_lock(); |
6203 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6204 | if (!rdev) |
1ca69c4b N |
6205 | err = -ENODEV; |
6206 | else { | |
6207 | md_error(mddev, rdev); | |
6208 | if (!test_bit(Faulty, &rdev->flags)) | |
6209 | err = -EBUSY; | |
6210 | } | |
6211 | rcu_read_unlock(); | |
6212 | return err; | |
1da177e4 LT |
6213 | } |
6214 | ||
2f9618ce AN |
6215 | /* |
6216 | * We have a problem here : there is no easy way to give a CHS | |
6217 | * virtual geometry. We currently pretend that we have a 2 heads | |
6218 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6219 | * dosfs just mad... ;-) | |
6220 | */ | |
a885c8c4 CH |
6221 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6222 | { | |
fd01b88c | 6223 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6224 | |
6225 | geo->heads = 2; | |
6226 | geo->sectors = 4; | |
49ce6cea | 6227 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6228 | return 0; |
6229 | } | |
6230 | ||
cb335f88 NS |
6231 | static inline bool md_ioctl_valid(unsigned int cmd) |
6232 | { | |
6233 | switch (cmd) { | |
6234 | case ADD_NEW_DISK: | |
6235 | case BLKROSET: | |
6236 | case GET_ARRAY_INFO: | |
6237 | case GET_BITMAP_FILE: | |
6238 | case GET_DISK_INFO: | |
6239 | case HOT_ADD_DISK: | |
6240 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
6241 | case RAID_AUTORUN: |
6242 | case RAID_VERSION: | |
6243 | case RESTART_ARRAY_RW: | |
6244 | case RUN_ARRAY: | |
6245 | case SET_ARRAY_INFO: | |
6246 | case SET_BITMAP_FILE: | |
6247 | case SET_DISK_FAULTY: | |
6248 | case STOP_ARRAY: | |
6249 | case STOP_ARRAY_RO: | |
6250 | return true; | |
6251 | default: | |
6252 | return false; | |
6253 | } | |
6254 | } | |
6255 | ||
a39907fa | 6256 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6257 | unsigned int cmd, unsigned long arg) |
6258 | { | |
6259 | int err = 0; | |
6260 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6261 | struct mddev *mddev = NULL; |
e2218350 | 6262 | int ro; |
1da177e4 | 6263 | |
cb335f88 NS |
6264 | if (!md_ioctl_valid(cmd)) |
6265 | return -ENOTTY; | |
6266 | ||
506c9e44 N |
6267 | switch (cmd) { |
6268 | case RAID_VERSION: | |
6269 | case GET_ARRAY_INFO: | |
6270 | case GET_DISK_INFO: | |
6271 | break; | |
6272 | default: | |
6273 | if (!capable(CAP_SYS_ADMIN)) | |
6274 | return -EACCES; | |
6275 | } | |
1da177e4 LT |
6276 | |
6277 | /* | |
6278 | * Commands dealing with the RAID driver but not any | |
6279 | * particular array: | |
6280 | */ | |
c02c0aeb N |
6281 | switch (cmd) { |
6282 | case RAID_VERSION: | |
6283 | err = get_version(argp); | |
3adc28d8 | 6284 | goto out; |
1da177e4 | 6285 | |
1da177e4 | 6286 | #ifndef MODULE |
c02c0aeb N |
6287 | case RAID_AUTORUN: |
6288 | err = 0; | |
6289 | autostart_arrays(arg); | |
3adc28d8 | 6290 | goto out; |
1da177e4 | 6291 | #endif |
c02c0aeb | 6292 | default:; |
1da177e4 LT |
6293 | } |
6294 | ||
6295 | /* | |
6296 | * Commands creating/starting a new array: | |
6297 | */ | |
6298 | ||
a39907fa | 6299 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6300 | |
6301 | if (!mddev) { | |
6302 | BUG(); | |
3adc28d8 | 6303 | goto out; |
1da177e4 LT |
6304 | } |
6305 | ||
1ca69c4b N |
6306 | /* Some actions do not requires the mutex */ |
6307 | switch (cmd) { | |
6308 | case GET_ARRAY_INFO: | |
6309 | if (!mddev->raid_disks && !mddev->external) | |
6310 | err = -ENODEV; | |
6311 | else | |
6312 | err = get_array_info(mddev, argp); | |
3adc28d8 | 6313 | goto out; |
1ca69c4b N |
6314 | |
6315 | case GET_DISK_INFO: | |
6316 | if (!mddev->raid_disks && !mddev->external) | |
6317 | err = -ENODEV; | |
6318 | else | |
6319 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 6320 | goto out; |
1ca69c4b N |
6321 | |
6322 | case SET_DISK_FAULTY: | |
6323 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6324 | goto out; |
4af1a041 N |
6325 | |
6326 | case GET_BITMAP_FILE: | |
6327 | err = get_bitmap_file(mddev, argp); | |
6328 | goto out; | |
6329 | ||
1ca69c4b N |
6330 | } |
6331 | ||
a7a3f08d N |
6332 | if (cmd == ADD_NEW_DISK) |
6333 | /* need to ensure md_delayed_delete() has completed */ | |
6334 | flush_workqueue(md_misc_wq); | |
6335 | ||
90f5f7ad HR |
6336 | if (cmd == HOT_REMOVE_DISK) |
6337 | /* need to ensure recovery thread has run */ | |
6338 | wait_event_interruptible_timeout(mddev->sb_wait, | |
6339 | !test_bit(MD_RECOVERY_NEEDED, | |
6340 | &mddev->flags), | |
6341 | msecs_to_jiffies(5000)); | |
260fa034 N |
6342 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
6343 | /* Need to flush page cache, and ensure no-one else opens | |
6344 | * and writes | |
6345 | */ | |
6346 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 6347 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
6348 | mutex_unlock(&mddev->open_mutex); |
6349 | err = -EBUSY; | |
3adc28d8 | 6350 | goto out; |
260fa034 N |
6351 | } |
6352 | set_bit(MD_STILL_CLOSED, &mddev->flags); | |
6353 | mutex_unlock(&mddev->open_mutex); | |
6354 | sync_blockdev(bdev); | |
6355 | } | |
1da177e4 LT |
6356 | err = mddev_lock(mddev); |
6357 | if (err) { | |
f72ffdd6 | 6358 | printk(KERN_INFO |
1da177e4 LT |
6359 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
6360 | err, cmd); | |
3adc28d8 | 6361 | goto out; |
1da177e4 LT |
6362 | } |
6363 | ||
c02c0aeb N |
6364 | if (cmd == SET_ARRAY_INFO) { |
6365 | mdu_array_info_t info; | |
6366 | if (!arg) | |
6367 | memset(&info, 0, sizeof(info)); | |
6368 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6369 | err = -EFAULT; | |
3adc28d8 | 6370 | goto unlock; |
c02c0aeb N |
6371 | } |
6372 | if (mddev->pers) { | |
6373 | err = update_array_info(mddev, &info); | |
6374 | if (err) { | |
6375 | printk(KERN_WARNING "md: couldn't update" | |
6376 | " array info. %d\n", err); | |
3adc28d8 | 6377 | goto unlock; |
1da177e4 | 6378 | } |
3adc28d8 | 6379 | goto unlock; |
c02c0aeb N |
6380 | } |
6381 | if (!list_empty(&mddev->disks)) { | |
6382 | printk(KERN_WARNING | |
6383 | "md: array %s already has disks!\n", | |
6384 | mdname(mddev)); | |
6385 | err = -EBUSY; | |
3adc28d8 | 6386 | goto unlock; |
c02c0aeb N |
6387 | } |
6388 | if (mddev->raid_disks) { | |
6389 | printk(KERN_WARNING | |
6390 | "md: array %s already initialised!\n", | |
6391 | mdname(mddev)); | |
6392 | err = -EBUSY; | |
3adc28d8 | 6393 | goto unlock; |
c02c0aeb N |
6394 | } |
6395 | err = set_array_info(mddev, &info); | |
6396 | if (err) { | |
6397 | printk(KERN_WARNING "md: couldn't set" | |
6398 | " array info. %d\n", err); | |
3adc28d8 | 6399 | goto unlock; |
c02c0aeb | 6400 | } |
3adc28d8 | 6401 | goto unlock; |
1da177e4 LT |
6402 | } |
6403 | ||
6404 | /* | |
6405 | * Commands querying/configuring an existing array: | |
6406 | */ | |
32a7627c | 6407 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6408 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6409 | if ((!mddev->raid_disks && !mddev->external) |
6410 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6411 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6412 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 6413 | err = -ENODEV; |
3adc28d8 | 6414 | goto unlock; |
1da177e4 LT |
6415 | } |
6416 | ||
6417 | /* | |
6418 | * Commands even a read-only array can execute: | |
6419 | */ | |
c02c0aeb | 6420 | switch (cmd) { |
c02c0aeb N |
6421 | case RESTART_ARRAY_RW: |
6422 | err = restart_array(mddev); | |
3adc28d8 | 6423 | goto unlock; |
1da177e4 | 6424 | |
c02c0aeb N |
6425 | case STOP_ARRAY: |
6426 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 6427 | goto unlock; |
1da177e4 | 6428 | |
c02c0aeb N |
6429 | case STOP_ARRAY_RO: |
6430 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 6431 | goto unlock; |
1da177e4 | 6432 | |
3ea8929d N |
6433 | case HOT_REMOVE_DISK: |
6434 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6435 | goto unlock; |
3ea8929d | 6436 | |
7ceb17e8 N |
6437 | case ADD_NEW_DISK: |
6438 | /* We can support ADD_NEW_DISK on read-only arrays | |
6439 | * on if we are re-adding a preexisting device. | |
6440 | * So require mddev->pers and MD_DISK_SYNC. | |
6441 | */ | |
6442 | if (mddev->pers) { | |
6443 | mdu_disk_info_t info; | |
6444 | if (copy_from_user(&info, argp, sizeof(info))) | |
6445 | err = -EFAULT; | |
6446 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6447 | /* Need to clear read-only for this */ | |
6448 | break; | |
6449 | else | |
6450 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6451 | goto unlock; |
7ceb17e8 N |
6452 | } |
6453 | break; | |
6454 | ||
c02c0aeb N |
6455 | case BLKROSET: |
6456 | if (get_user(ro, (int __user *)(arg))) { | |
6457 | err = -EFAULT; | |
3adc28d8 | 6458 | goto unlock; |
c02c0aeb N |
6459 | } |
6460 | err = -EINVAL; | |
e2218350 | 6461 | |
c02c0aeb N |
6462 | /* if the bdev is going readonly the value of mddev->ro |
6463 | * does not matter, no writes are coming | |
6464 | */ | |
6465 | if (ro) | |
3adc28d8 | 6466 | goto unlock; |
e2218350 | 6467 | |
c02c0aeb N |
6468 | /* are we are already prepared for writes? */ |
6469 | if (mddev->ro != 1) | |
3adc28d8 | 6470 | goto unlock; |
e2218350 | 6471 | |
c02c0aeb N |
6472 | /* transitioning to readauto need only happen for |
6473 | * arrays that call md_write_start | |
6474 | */ | |
6475 | if (mddev->pers) { | |
6476 | err = restart_array(mddev); | |
6477 | if (err == 0) { | |
6478 | mddev->ro = 2; | |
6479 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6480 | } |
c02c0aeb | 6481 | } |
3adc28d8 | 6482 | goto unlock; |
1da177e4 LT |
6483 | } |
6484 | ||
6485 | /* | |
6486 | * The remaining ioctls are changing the state of the | |
f91de92e | 6487 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 6488 | */ |
326eb17d | 6489 | if (mddev->ro && mddev->pers) { |
f91de92e N |
6490 | if (mddev->ro == 2) { |
6491 | mddev->ro = 0; | |
00bcb4ac | 6492 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6493 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6494 | /* mddev_unlock will wake thread */ |
6495 | /* If a device failed while we were read-only, we | |
6496 | * need to make sure the metadata is updated now. | |
6497 | */ | |
6498 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6499 | mddev_unlock(mddev); | |
6500 | wait_event(mddev->sb_wait, | |
6501 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6502 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
29f097c4 | 6503 | mddev_lock_nointr(mddev); |
f3378b48 | 6504 | } |
f91de92e N |
6505 | } else { |
6506 | err = -EROFS; | |
3adc28d8 | 6507 | goto unlock; |
f91de92e | 6508 | } |
1da177e4 LT |
6509 | } |
6510 | ||
c02c0aeb N |
6511 | switch (cmd) { |
6512 | case ADD_NEW_DISK: | |
1da177e4 | 6513 | { |
c02c0aeb N |
6514 | mdu_disk_info_t info; |
6515 | if (copy_from_user(&info, argp, sizeof(info))) | |
6516 | err = -EFAULT; | |
6517 | else | |
6518 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6519 | goto unlock; |
c02c0aeb | 6520 | } |
1da177e4 | 6521 | |
c02c0aeb N |
6522 | case HOT_ADD_DISK: |
6523 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6524 | goto unlock; |
1da177e4 | 6525 | |
c02c0aeb N |
6526 | case RUN_ARRAY: |
6527 | err = do_md_run(mddev); | |
3adc28d8 | 6528 | goto unlock; |
1da177e4 | 6529 | |
c02c0aeb N |
6530 | case SET_BITMAP_FILE: |
6531 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 6532 | goto unlock; |
32a7627c | 6533 | |
c02c0aeb N |
6534 | default: |
6535 | err = -EINVAL; | |
3adc28d8 | 6536 | goto unlock; |
1da177e4 LT |
6537 | } |
6538 | ||
3adc28d8 | 6539 | unlock: |
d3374825 N |
6540 | if (mddev->hold_active == UNTIL_IOCTL && |
6541 | err != -EINVAL) | |
6542 | mddev->hold_active = 0; | |
1da177e4 | 6543 | mddev_unlock(mddev); |
3adc28d8 | 6544 | out: |
1da177e4 LT |
6545 | return err; |
6546 | } | |
aa98aa31 AB |
6547 | #ifdef CONFIG_COMPAT |
6548 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6549 | unsigned int cmd, unsigned long arg) | |
6550 | { | |
6551 | switch (cmd) { | |
6552 | case HOT_REMOVE_DISK: | |
6553 | case HOT_ADD_DISK: | |
6554 | case SET_DISK_FAULTY: | |
6555 | case SET_BITMAP_FILE: | |
6556 | /* These take in integer arg, do not convert */ | |
6557 | break; | |
6558 | default: | |
6559 | arg = (unsigned long)compat_ptr(arg); | |
6560 | break; | |
6561 | } | |
6562 | ||
6563 | return md_ioctl(bdev, mode, cmd, arg); | |
6564 | } | |
6565 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6566 | |
a39907fa | 6567 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6568 | { |
6569 | /* | |
6570 | * Succeed if we can lock the mddev, which confirms that | |
6571 | * it isn't being stopped right now. | |
6572 | */ | |
fd01b88c | 6573 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6574 | int err; |
6575 | ||
0c098220 YL |
6576 | if (!mddev) |
6577 | return -ENODEV; | |
6578 | ||
d3374825 N |
6579 | if (mddev->gendisk != bdev->bd_disk) { |
6580 | /* we are racing with mddev_put which is discarding this | |
6581 | * bd_disk. | |
6582 | */ | |
6583 | mddev_put(mddev); | |
6584 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6585 | flush_workqueue(md_misc_wq); |
d3374825 N |
6586 | /* Then retry the open from the top */ |
6587 | return -ERESTARTSYS; | |
6588 | } | |
6589 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6590 | ||
c8c00a69 | 6591 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6592 | goto out; |
6593 | ||
6594 | err = 0; | |
f2ea68cf | 6595 | atomic_inc(&mddev->openers); |
260fa034 | 6596 | clear_bit(MD_STILL_CLOSED, &mddev->flags); |
c8c00a69 | 6597 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6598 | |
f0b4f7e2 | 6599 | check_disk_change(bdev); |
1da177e4 LT |
6600 | out: |
6601 | return err; | |
6602 | } | |
6603 | ||
db2a144b | 6604 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6605 | { |
f72ffdd6 | 6606 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6607 | |
52e5f9d1 | 6608 | BUG_ON(!mddev); |
f2ea68cf | 6609 | atomic_dec(&mddev->openers); |
1da177e4 | 6610 | mddev_put(mddev); |
1da177e4 | 6611 | } |
f0b4f7e2 N |
6612 | |
6613 | static int md_media_changed(struct gendisk *disk) | |
6614 | { | |
fd01b88c | 6615 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6616 | |
6617 | return mddev->changed; | |
6618 | } | |
6619 | ||
6620 | static int md_revalidate(struct gendisk *disk) | |
6621 | { | |
fd01b88c | 6622 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6623 | |
6624 | mddev->changed = 0; | |
6625 | return 0; | |
6626 | } | |
83d5cde4 | 6627 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6628 | { |
6629 | .owner = THIS_MODULE, | |
a39907fa AV |
6630 | .open = md_open, |
6631 | .release = md_release, | |
b492b852 | 6632 | .ioctl = md_ioctl, |
aa98aa31 AB |
6633 | #ifdef CONFIG_COMPAT |
6634 | .compat_ioctl = md_compat_ioctl, | |
6635 | #endif | |
a885c8c4 | 6636 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6637 | .media_changed = md_media_changed, |
6638 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6639 | }; |
6640 | ||
f72ffdd6 | 6641 | static int md_thread(void *arg) |
1da177e4 | 6642 | { |
2b8bf345 | 6643 | struct md_thread *thread = arg; |
1da177e4 | 6644 | |
1da177e4 LT |
6645 | /* |
6646 | * md_thread is a 'system-thread', it's priority should be very | |
6647 | * high. We avoid resource deadlocks individually in each | |
6648 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6649 | * the very same RT priority as kswapd, thus we will never get | |
6650 | * into a priority inversion deadlock. | |
6651 | * | |
6652 | * we definitely have to have equal or higher priority than | |
6653 | * bdflush, otherwise bdflush will deadlock if there are too | |
6654 | * many dirty RAID5 blocks. | |
6655 | */ | |
1da177e4 | 6656 | |
6985c43f | 6657 | allow_signal(SIGKILL); |
a6fb0934 | 6658 | while (!kthread_should_stop()) { |
1da177e4 | 6659 | |
93588e22 N |
6660 | /* We need to wait INTERRUPTIBLE so that |
6661 | * we don't add to the load-average. | |
6662 | * That means we need to be sure no signals are | |
6663 | * pending | |
6664 | */ | |
6665 | if (signal_pending(current)) | |
6666 | flush_signals(current); | |
6667 | ||
6668 | wait_event_interruptible_timeout | |
6669 | (thread->wqueue, | |
6670 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6671 | || kthread_should_stop(), | |
6672 | thread->timeout); | |
1da177e4 | 6673 | |
6c987910 N |
6674 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6675 | if (!kthread_should_stop()) | |
4ed8731d | 6676 | thread->run(thread); |
1da177e4 | 6677 | } |
a6fb0934 | 6678 | |
1da177e4 LT |
6679 | return 0; |
6680 | } | |
6681 | ||
2b8bf345 | 6682 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
6683 | { |
6684 | if (thread) { | |
36a4e1fe | 6685 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
6686 | set_bit(THREAD_WAKEUP, &thread->flags); |
6687 | wake_up(&thread->wqueue); | |
6688 | } | |
6689 | } | |
6c144d31 | 6690 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 6691 | |
4ed8731d SL |
6692 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
6693 | struct mddev *mddev, const char *name) | |
1da177e4 | 6694 | { |
2b8bf345 | 6695 | struct md_thread *thread; |
1da177e4 | 6696 | |
2b8bf345 | 6697 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
6698 | if (!thread) |
6699 | return NULL; | |
6700 | ||
1da177e4 LT |
6701 | init_waitqueue_head(&thread->wqueue); |
6702 | ||
1da177e4 LT |
6703 | thread->run = run; |
6704 | thread->mddev = mddev; | |
32a7627c | 6705 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6706 | thread->tsk = kthread_run(md_thread, thread, |
6707 | "%s_%s", | |
6708 | mdname(thread->mddev), | |
0232605d | 6709 | name); |
a6fb0934 | 6710 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6711 | kfree(thread); |
6712 | return NULL; | |
6713 | } | |
1da177e4 LT |
6714 | return thread; |
6715 | } | |
6c144d31 | 6716 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 6717 | |
2b8bf345 | 6718 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 6719 | { |
2b8bf345 | 6720 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
6721 | if (!thread) |
6722 | return; | |
36a4e1fe | 6723 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
6724 | /* Locking ensures that mddev_unlock does not wake_up a |
6725 | * non-existent thread | |
6726 | */ | |
6727 | spin_lock(&pers_lock); | |
6728 | *threadp = NULL; | |
6729 | spin_unlock(&pers_lock); | |
a6fb0934 N |
6730 | |
6731 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6732 | kfree(thread); |
6733 | } | |
6c144d31 | 6734 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 6735 | |
fd01b88c | 6736 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 6737 | { |
b2d444d7 | 6738 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6739 | return; |
6bfe0b49 | 6740 | |
de393cde | 6741 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
6742 | return; |
6743 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6744 | if (mddev->degraded) |
6745 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6746 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6747 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6748 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6749 | md_wakeup_thread(mddev->thread); | |
768a418d | 6750 | if (mddev->event_work.func) |
e804ac78 | 6751 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6752 | md_new_event_inintr(mddev); |
1da177e4 | 6753 | } |
6c144d31 | 6754 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
6755 | |
6756 | /* seq_file implementation /proc/mdstat */ | |
6757 | ||
6758 | static void status_unused(struct seq_file *seq) | |
6759 | { | |
6760 | int i = 0; | |
3cb03002 | 6761 | struct md_rdev *rdev; |
1da177e4 LT |
6762 | |
6763 | seq_printf(seq, "unused devices: "); | |
6764 | ||
159ec1fc | 6765 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6766 | char b[BDEVNAME_SIZE]; |
6767 | i++; | |
6768 | seq_printf(seq, "%s ", | |
6769 | bdevname(rdev->bdev,b)); | |
6770 | } | |
6771 | if (!i) | |
6772 | seq_printf(seq, "<none>"); | |
6773 | ||
6774 | seq_printf(seq, "\n"); | |
6775 | } | |
6776 | ||
f72ffdd6 | 6777 | static void status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 6778 | { |
dd71cf6b N |
6779 | sector_t max_sectors, resync, res; |
6780 | unsigned long dt, db; | |
6781 | sector_t rt; | |
4588b42e N |
6782 | int scale; |
6783 | unsigned int per_milli; | |
1da177e4 | 6784 | |
72f36d59 N |
6785 | if (mddev->curr_resync <= 3) |
6786 | resync = 0; | |
6787 | else | |
6788 | resync = mddev->curr_resync | |
6789 | - atomic_read(&mddev->recovery_active); | |
1da177e4 | 6790 | |
c804cdec N |
6791 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
6792 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 6793 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6794 | else |
dd71cf6b | 6795 | max_sectors = mddev->dev_sectors; |
1da177e4 | 6796 | |
403df478 | 6797 | WARN_ON(max_sectors == 0); |
4588b42e | 6798 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6799 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6800 | * u32, as those are the requirements for sector_div. |
6801 | * Thus 'scale' must be at least 10 | |
6802 | */ | |
6803 | scale = 10; | |
6804 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6805 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6806 | scale++; |
6807 | } | |
6808 | res = (resync>>scale)*1000; | |
dd71cf6b | 6809 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6810 | |
6811 | per_milli = res; | |
1da177e4 | 6812 | { |
4588b42e | 6813 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6814 | seq_printf(seq, "["); |
6815 | for (i = 0; i < x; i++) | |
6816 | seq_printf(seq, "="); | |
6817 | seq_printf(seq, ">"); | |
6818 | for (i = 0; i < y; i++) | |
6819 | seq_printf(seq, "."); | |
6820 | seq_printf(seq, "] "); | |
6821 | } | |
4588b42e | 6822 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6823 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6824 | "reshape" : | |
61df9d91 N |
6825 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6826 | "check" : | |
6827 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6828 | "resync" : "recovery"))), | |
6829 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6830 | (unsigned long long) resync/2, |
6831 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6832 | |
6833 | /* | |
1da177e4 LT |
6834 | * dt: time from mark until now |
6835 | * db: blocks written from mark until now | |
6836 | * rt: remaining time | |
dd71cf6b N |
6837 | * |
6838 | * rt is a sector_t, so could be 32bit or 64bit. | |
6839 | * So we divide before multiply in case it is 32bit and close | |
6840 | * to the limit. | |
25985edc | 6841 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6842 | * near the end of resync when the number of remaining sectors |
6843 | * is close to 'db'. | |
6844 | * We then divide rt by 32 after multiplying by db to compensate. | |
6845 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6846 | */ |
6847 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6848 | if (!dt) dt++; | |
ff4e8d9a N |
6849 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6850 | - mddev->resync_mark_cnt; | |
1da177e4 | 6851 | |
dd71cf6b N |
6852 | rt = max_sectors - resync; /* number of remaining sectors */ |
6853 | sector_div(rt, db/32+1); | |
6854 | rt *= dt; | |
6855 | rt >>= 5; | |
6856 | ||
6857 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6858 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6859 | |
ff4e8d9a | 6860 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6861 | } |
6862 | ||
6863 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6864 | { | |
6865 | struct list_head *tmp; | |
6866 | loff_t l = *pos; | |
fd01b88c | 6867 | struct mddev *mddev; |
1da177e4 LT |
6868 | |
6869 | if (l >= 0x10000) | |
6870 | return NULL; | |
6871 | if (!l--) | |
6872 | /* header */ | |
6873 | return (void*)1; | |
6874 | ||
6875 | spin_lock(&all_mddevs_lock); | |
6876 | list_for_each(tmp,&all_mddevs) | |
6877 | if (!l--) { | |
fd01b88c | 6878 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
6879 | mddev_get(mddev); |
6880 | spin_unlock(&all_mddevs_lock); | |
6881 | return mddev; | |
6882 | } | |
6883 | spin_unlock(&all_mddevs_lock); | |
6884 | if (!l--) | |
6885 | return (void*)2;/* tail */ | |
6886 | return NULL; | |
6887 | } | |
6888 | ||
6889 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6890 | { | |
6891 | struct list_head *tmp; | |
fd01b88c | 6892 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 6893 | |
1da177e4 LT |
6894 | ++*pos; |
6895 | if (v == (void*)2) | |
6896 | return NULL; | |
6897 | ||
6898 | spin_lock(&all_mddevs_lock); | |
6899 | if (v == (void*)1) | |
6900 | tmp = all_mddevs.next; | |
6901 | else | |
6902 | tmp = mddev->all_mddevs.next; | |
6903 | if (tmp != &all_mddevs) | |
fd01b88c | 6904 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
6905 | else { |
6906 | next_mddev = (void*)2; | |
6907 | *pos = 0x10000; | |
f72ffdd6 | 6908 | } |
1da177e4 LT |
6909 | spin_unlock(&all_mddevs_lock); |
6910 | ||
6911 | if (v != (void*)1) | |
6912 | mddev_put(mddev); | |
6913 | return next_mddev; | |
6914 | ||
6915 | } | |
6916 | ||
6917 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6918 | { | |
fd01b88c | 6919 | struct mddev *mddev = v; |
1da177e4 LT |
6920 | |
6921 | if (mddev && v != (void*)1 && v != (void*)2) | |
6922 | mddev_put(mddev); | |
6923 | } | |
6924 | ||
6925 | static int md_seq_show(struct seq_file *seq, void *v) | |
6926 | { | |
fd01b88c | 6927 | struct mddev *mddev = v; |
dd8ac336 | 6928 | sector_t sectors; |
3cb03002 | 6929 | struct md_rdev *rdev; |
1da177e4 LT |
6930 | |
6931 | if (v == (void*)1) { | |
84fc4b56 | 6932 | struct md_personality *pers; |
1da177e4 LT |
6933 | seq_printf(seq, "Personalities : "); |
6934 | spin_lock(&pers_lock); | |
2604b703 N |
6935 | list_for_each_entry(pers, &pers_list, list) |
6936 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6937 | |
6938 | spin_unlock(&pers_lock); | |
6939 | seq_printf(seq, "\n"); | |
f1514638 | 6940 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
6941 | return 0; |
6942 | } | |
6943 | if (v == (void*)2) { | |
6944 | status_unused(seq); | |
6945 | return 0; | |
6946 | } | |
6947 | ||
36d091f4 | 6948 | spin_lock(&mddev->lock); |
1da177e4 LT |
6949 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6950 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6951 | mddev->pers ? "" : "in"); | |
6952 | if (mddev->pers) { | |
f91de92e | 6953 | if (mddev->ro==1) |
1da177e4 | 6954 | seq_printf(seq, " (read-only)"); |
f91de92e | 6955 | if (mddev->ro==2) |
52720ae7 | 6956 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6957 | seq_printf(seq, " %s", mddev->pers->name); |
6958 | } | |
6959 | ||
dd8ac336 | 6960 | sectors = 0; |
f97fcad3 N |
6961 | rcu_read_lock(); |
6962 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 LT |
6963 | char b[BDEVNAME_SIZE]; |
6964 | seq_printf(seq, " %s[%d]", | |
6965 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6966 | if (test_bit(WriteMostly, &rdev->flags)) |
6967 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6968 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6969 | seq_printf(seq, "(F)"); |
6970 | continue; | |
2d78f8c4 N |
6971 | } |
6972 | if (rdev->raid_disk < 0) | |
b325a32e | 6973 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
6974 | if (test_bit(Replacement, &rdev->flags)) |
6975 | seq_printf(seq, "(R)"); | |
dd8ac336 | 6976 | sectors += rdev->sectors; |
1da177e4 | 6977 | } |
f97fcad3 | 6978 | rcu_read_unlock(); |
1da177e4 LT |
6979 | |
6980 | if (!list_empty(&mddev->disks)) { | |
6981 | if (mddev->pers) | |
6982 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6983 | (unsigned long long) |
6984 | mddev->array_sectors / 2); | |
1da177e4 LT |
6985 | else |
6986 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6987 | (unsigned long long)sectors / 2); |
1da177e4 | 6988 | } |
1cd6bf19 N |
6989 | if (mddev->persistent) { |
6990 | if (mddev->major_version != 0 || | |
6991 | mddev->minor_version != 90) { | |
6992 | seq_printf(seq," super %d.%d", | |
6993 | mddev->major_version, | |
6994 | mddev->minor_version); | |
6995 | } | |
e691063a N |
6996 | } else if (mddev->external) |
6997 | seq_printf(seq, " super external:%s", | |
6998 | mddev->metadata_type); | |
6999 | else | |
1cd6bf19 | 7000 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
7001 | |
7002 | if (mddev->pers) { | |
d710e138 | 7003 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 7004 | seq_printf(seq, "\n "); |
8e1b39d6 N |
7005 | if (mddev->pers->sync_request) { |
7006 | if (mddev->curr_resync > 2) { | |
d710e138 | 7007 | status_resync(seq, mddev); |
8e1b39d6 | 7008 | seq_printf(seq, "\n "); |
72f36d59 | 7009 | } else if (mddev->curr_resync >= 1) |
8e1b39d6 N |
7010 | seq_printf(seq, "\tresync=DELAYED\n "); |
7011 | else if (mddev->recovery_cp < MaxSector) | |
7012 | seq_printf(seq, "\tresync=PENDING\n "); | |
7013 | } | |
32a7627c N |
7014 | } else |
7015 | seq_printf(seq, "\n "); | |
7016 | ||
57148964 | 7017 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7018 | |
7019 | seq_printf(seq, "\n"); | |
7020 | } | |
36d091f4 | 7021 | spin_unlock(&mddev->lock); |
f72ffdd6 | 7022 | |
1da177e4 LT |
7023 | return 0; |
7024 | } | |
7025 | ||
110518bc | 7026 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7027 | .start = md_seq_start, |
7028 | .next = md_seq_next, | |
7029 | .stop = md_seq_stop, | |
7030 | .show = md_seq_show, | |
7031 | }; | |
7032 | ||
7033 | static int md_seq_open(struct inode *inode, struct file *file) | |
7034 | { | |
f1514638 | 7035 | struct seq_file *seq; |
1da177e4 LT |
7036 | int error; |
7037 | ||
7038 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7039 | if (error) |
f1514638 KS |
7040 | return error; |
7041 | ||
7042 | seq = file->private_data; | |
7043 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7044 | return error; |
7045 | } | |
7046 | ||
e2f23b60 | 7047 | static int md_unloading; |
d7603b7e N |
7048 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7049 | { | |
f1514638 | 7050 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7051 | int mask; |
7052 | ||
e2f23b60 | 7053 | if (md_unloading) |
7d7e64f2 | 7054 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7055 | poll_wait(filp, &md_event_waiters, wait); |
7056 | ||
7057 | /* always allow read */ | |
7058 | mask = POLLIN | POLLRDNORM; | |
7059 | ||
f1514638 | 7060 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7061 | mask |= POLLERR | POLLPRI; |
7062 | return mask; | |
7063 | } | |
7064 | ||
fa027c2a | 7065 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7066 | .owner = THIS_MODULE, |
1da177e4 LT |
7067 | .open = md_seq_open, |
7068 | .read = seq_read, | |
7069 | .llseek = seq_lseek, | |
c3f94b40 | 7070 | .release = seq_release_private, |
d7603b7e | 7071 | .poll = mdstat_poll, |
1da177e4 LT |
7072 | }; |
7073 | ||
84fc4b56 | 7074 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7075 | { |
50bd3774 CY |
7076 | printk(KERN_INFO "md: %s personality registered for level %d\n", |
7077 | p->name, p->level); | |
1da177e4 | 7078 | spin_lock(&pers_lock); |
2604b703 | 7079 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7080 | spin_unlock(&pers_lock); |
7081 | return 0; | |
7082 | } | |
6c144d31 | 7083 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7084 | |
84fc4b56 | 7085 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7086 | { |
2604b703 | 7087 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7088 | spin_lock(&pers_lock); |
2604b703 | 7089 | list_del_init(&p->list); |
1da177e4 LT |
7090 | spin_unlock(&pers_lock); |
7091 | return 0; | |
7092 | } | |
6c144d31 | 7093 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7094 | |
fd01b88c | 7095 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7096 | { |
f72ffdd6 | 7097 | struct md_rdev *rdev; |
1da177e4 | 7098 | int idle; |
eea1bf38 | 7099 | int curr_events; |
1da177e4 LT |
7100 | |
7101 | idle = 1; | |
4b80991c N |
7102 | rcu_read_lock(); |
7103 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7104 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7105 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7106 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7107 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7108 | /* sync IO will cause sync_io to increase before the disk_stats |
7109 | * as sync_io is counted when a request starts, and | |
7110 | * disk_stats is counted when it completes. | |
7111 | * So resync activity will cause curr_events to be smaller than | |
7112 | * when there was no such activity. | |
7113 | * non-sync IO will cause disk_stat to increase without | |
7114 | * increasing sync_io so curr_events will (eventually) | |
7115 | * be larger than it was before. Once it becomes | |
7116 | * substantially larger, the test below will cause | |
7117 | * the array to appear non-idle, and resync will slow | |
7118 | * down. | |
7119 | * If there is a lot of outstanding resync activity when | |
7120 | * we set last_event to curr_events, then all that activity | |
7121 | * completing might cause the array to appear non-idle | |
7122 | * and resync will be slowed down even though there might | |
7123 | * not have been non-resync activity. This will only | |
7124 | * happen once though. 'last_events' will soon reflect | |
7125 | * the state where there is little or no outstanding | |
7126 | * resync requests, and further resync activity will | |
7127 | * always make curr_events less than last_events. | |
c0e48521 | 7128 | * |
1da177e4 | 7129 | */ |
eea1bf38 | 7130 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7131 | rdev->last_events = curr_events; |
7132 | idle = 0; | |
7133 | } | |
7134 | } | |
4b80991c | 7135 | rcu_read_unlock(); |
1da177e4 LT |
7136 | return idle; |
7137 | } | |
7138 | ||
fd01b88c | 7139 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7140 | { |
7141 | /* another "blocks" (512byte) blocks have been synced */ | |
7142 | atomic_sub(blocks, &mddev->recovery_active); | |
7143 | wake_up(&mddev->recovery_wait); | |
7144 | if (!ok) { | |
dfc70645 | 7145 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7146 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7147 | md_wakeup_thread(mddev->thread); |
7148 | // stop recovery, signal do_sync .... | |
7149 | } | |
7150 | } | |
6c144d31 | 7151 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 7152 | |
06d91a5f N |
7153 | /* md_write_start(mddev, bi) |
7154 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7155 | * in superblock) before writing, schedule a superblock update |
7156 | * and wait for it to complete. | |
06d91a5f | 7157 | */ |
fd01b88c | 7158 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7159 | { |
0fd62b86 | 7160 | int did_change = 0; |
06d91a5f | 7161 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7162 | return; |
06d91a5f | 7163 | |
f91de92e N |
7164 | BUG_ON(mddev->ro == 1); |
7165 | if (mddev->ro == 2) { | |
7166 | /* need to switch to read/write */ | |
7167 | mddev->ro = 0; | |
7168 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7169 | md_wakeup_thread(mddev->thread); | |
25156198 | 7170 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7171 | did_change = 1; |
f91de92e | 7172 | } |
06d91a5f | 7173 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7174 | if (mddev->safemode == 1) |
7175 | mddev->safemode = 0; | |
06d91a5f | 7176 | if (mddev->in_sync) { |
85572d7c | 7177 | spin_lock(&mddev->lock); |
3d310eb7 N |
7178 | if (mddev->in_sync) { |
7179 | mddev->in_sync = 0; | |
850b2b42 | 7180 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7181 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7182 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7183 | did_change = 1; |
3d310eb7 | 7184 | } |
85572d7c | 7185 | spin_unlock(&mddev->lock); |
06d91a5f | 7186 | } |
0fd62b86 | 7187 | if (did_change) |
00bcb4ac | 7188 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7189 | wait_event(mddev->sb_wait, |
09a44cc1 | 7190 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 | 7191 | } |
6c144d31 | 7192 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 7193 | |
fd01b88c | 7194 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7195 | { |
7196 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7197 | if (mddev->safemode == 2) | |
7198 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7199 | else if (mddev->safemode_delay) |
1da177e4 LT |
7200 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7201 | } | |
7202 | } | |
6c144d31 | 7203 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 7204 | |
2a2275d6 N |
7205 | /* md_allow_write(mddev) |
7206 | * Calling this ensures that the array is marked 'active' so that writes | |
7207 | * may proceed without blocking. It is important to call this before | |
7208 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7209 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7210 | * |
7211 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7212 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7213 | */ |
fd01b88c | 7214 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7215 | { |
7216 | if (!mddev->pers) | |
b5470dc5 | 7217 | return 0; |
2a2275d6 | 7218 | if (mddev->ro) |
b5470dc5 | 7219 | return 0; |
1a0fd497 | 7220 | if (!mddev->pers->sync_request) |
b5470dc5 | 7221 | return 0; |
2a2275d6 | 7222 | |
85572d7c | 7223 | spin_lock(&mddev->lock); |
2a2275d6 N |
7224 | if (mddev->in_sync) { |
7225 | mddev->in_sync = 0; | |
7226 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7227 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7228 | if (mddev->safemode_delay && |
7229 | mddev->safemode == 0) | |
7230 | mddev->safemode = 1; | |
85572d7c | 7231 | spin_unlock(&mddev->lock); |
2a2275d6 | 7232 | md_update_sb(mddev, 0); |
00bcb4ac | 7233 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 | 7234 | } else |
85572d7c | 7235 | spin_unlock(&mddev->lock); |
b5470dc5 | 7236 | |
070dc6dd | 7237 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7238 | return -EAGAIN; |
7239 | else | |
7240 | return 0; | |
2a2275d6 N |
7241 | } |
7242 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7243 | ||
1da177e4 LT |
7244 | #define SYNC_MARKS 10 |
7245 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7246 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7247 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7248 | { |
4ed8731d | 7249 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7250 | struct mddev *mddev2; |
1da177e4 LT |
7251 | unsigned int currspeed = 0, |
7252 | window; | |
ac7e50a3 | 7253 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 7254 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7255 | unsigned long update_time; |
1da177e4 LT |
7256 | sector_t mark_cnt[SYNC_MARKS]; |
7257 | int last_mark,m; | |
7258 | struct list_head *tmp; | |
7259 | sector_t last_check; | |
57afd89f | 7260 | int skipped = 0; |
3cb03002 | 7261 | struct md_rdev *rdev; |
c4a39551 | 7262 | char *desc, *action = NULL; |
7c2c57c9 | 7263 | struct blk_plug plug; |
1da177e4 LT |
7264 | |
7265 | /* just incase thread restarts... */ | |
7266 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7267 | return; | |
3991b31e N |
7268 | if (mddev->ro) {/* never try to sync a read-only array */ |
7269 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 7270 | return; |
3991b31e | 7271 | } |
1da177e4 | 7272 | |
61df9d91 | 7273 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 7274 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 7275 | desc = "data-check"; |
c4a39551 JB |
7276 | action = "check"; |
7277 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 7278 | desc = "requested-resync"; |
c4a39551 JB |
7279 | action = "repair"; |
7280 | } else | |
61df9d91 N |
7281 | desc = "resync"; |
7282 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7283 | desc = "reshape"; | |
7284 | else | |
7285 | desc = "recovery"; | |
7286 | ||
c4a39551 JB |
7287 | mddev->last_sync_action = action ?: desc; |
7288 | ||
1da177e4 LT |
7289 | /* we overload curr_resync somewhat here. |
7290 | * 0 == not engaged in resync at all | |
7291 | * 2 == checking that there is no conflict with another sync | |
7292 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7293 | * commense | |
7294 | * other == active in resync - this many blocks | |
7295 | * | |
7296 | * Before starting a resync we must have set curr_resync to | |
7297 | * 2, and then checked that every "conflicting" array has curr_resync | |
7298 | * less than ours. When we find one that is the same or higher | |
7299 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7300 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7301 | * This will mean we have to start checking from the beginning again. | |
7302 | * | |
7303 | */ | |
7304 | ||
7305 | do { | |
7306 | mddev->curr_resync = 2; | |
7307 | ||
7308 | try_again: | |
404e4b43 | 7309 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 7310 | goto skip; |
29ac4aa3 | 7311 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7312 | if (mddev2 == mddev) |
7313 | continue; | |
90b08710 BS |
7314 | if (!mddev->parallel_resync |
7315 | && mddev2->curr_resync | |
7316 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7317 | DEFINE_WAIT(wq); |
7318 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7319 | /* arbitrarily yield */ | |
7320 | mddev->curr_resync = 1; | |
7321 | wake_up(&resync_wait); | |
7322 | } | |
7323 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7324 | /* no need to wait here, we can wait the next | |
7325 | * time 'round when curr_resync == 2 | |
7326 | */ | |
7327 | continue; | |
9744197c N |
7328 | /* We need to wait 'interruptible' so as not to |
7329 | * contribute to the load average, and not to | |
7330 | * be caught by 'softlockup' | |
7331 | */ | |
7332 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 7333 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 7334 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7335 | printk(KERN_INFO "md: delaying %s of %s" |
7336 | " until %s has finished (they" | |
1da177e4 | 7337 | " share one or more physical units)\n", |
61df9d91 | 7338 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7339 | mddev_put(mddev2); |
9744197c N |
7340 | if (signal_pending(current)) |
7341 | flush_signals(current); | |
1da177e4 LT |
7342 | schedule(); |
7343 | finish_wait(&resync_wait, &wq); | |
7344 | goto try_again; | |
7345 | } | |
7346 | finish_wait(&resync_wait, &wq); | |
7347 | } | |
7348 | } | |
7349 | } while (mddev->curr_resync < 2); | |
7350 | ||
5fd6c1dc | 7351 | j = 0; |
9d88883e | 7352 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7353 | /* resync follows the size requested by the personality, |
57afd89f | 7354 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7355 | */ |
7356 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7357 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7358 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7359 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7360 | j = mddev->resync_min; | |
7361 | else if (!mddev->bitmap) | |
5fd6c1dc | 7362 | j = mddev->recovery_cp; |
5e96ee65 | 7363 | |
ccfcc3c1 | 7364 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7365 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7366 | else { |
1da177e4 | 7367 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7368 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7369 | j = MaxSector; |
4e59ca7d | 7370 | rcu_read_lock(); |
dafb20fa | 7371 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc N |
7372 | if (rdev->raid_disk >= 0 && |
7373 | !test_bit(Faulty, &rdev->flags) && | |
7374 | !test_bit(In_sync, &rdev->flags) && | |
7375 | rdev->recovery_offset < j) | |
7376 | j = rdev->recovery_offset; | |
4e59ca7d | 7377 | rcu_read_unlock(); |
133d4527 N |
7378 | |
7379 | /* If there is a bitmap, we need to make sure all | |
7380 | * writes that started before we added a spare | |
7381 | * complete before we start doing a recovery. | |
7382 | * Otherwise the write might complete and (via | |
7383 | * bitmap_endwrite) set a bit in the bitmap after the | |
7384 | * recovery has checked that bit and skipped that | |
7385 | * region. | |
7386 | */ | |
7387 | if (mddev->bitmap) { | |
7388 | mddev->pers->quiesce(mddev, 1); | |
7389 | mddev->pers->quiesce(mddev, 0); | |
7390 | } | |
5fd6c1dc | 7391 | } |
1da177e4 | 7392 | |
61df9d91 N |
7393 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7394 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7395 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7396 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7397 | "(but not more than %d KB/sec) for %s.\n", |
7398 | speed_max(mddev), desc); | |
1da177e4 | 7399 | |
eea1bf38 | 7400 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7401 | |
57afd89f | 7402 | io_sectors = 0; |
1da177e4 LT |
7403 | for (m = 0; m < SYNC_MARKS; m++) { |
7404 | mark[m] = jiffies; | |
57afd89f | 7405 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7406 | } |
7407 | last_mark = 0; | |
7408 | mddev->resync_mark = mark[last_mark]; | |
7409 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7410 | ||
7411 | /* | |
7412 | * Tune reconstruction: | |
7413 | */ | |
7414 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7415 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7416 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7417 | |
7418 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7419 | last_check = 0; |
7420 | ||
7421 | if (j>2) { | |
c91abf5a | 7422 | printk(KERN_INFO |
61df9d91 N |
7423 | "md: resuming %s of %s from checkpoint.\n", |
7424 | desc, mdname(mddev)); | |
1da177e4 | 7425 | mddev->curr_resync = j; |
72f36d59 N |
7426 | } else |
7427 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7428 | mddev->curr_resync_completed = j; |
72f36d59 N |
7429 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7430 | md_new_event(mddev); | |
54f89341 | 7431 | update_time = jiffies; |
1da177e4 | 7432 | |
7c2c57c9 | 7433 | blk_start_plug(&plug); |
1da177e4 | 7434 | while (j < max_sectors) { |
57afd89f | 7435 | sector_t sectors; |
1da177e4 | 7436 | |
57afd89f | 7437 | skipped = 0; |
97e4f42d | 7438 | |
7a91ee1f N |
7439 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7440 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7441 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7442 | > (max_sectors >> 4)) || | |
54f89341 | 7443 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f N |
7444 | (j - mddev->curr_resync_completed)*2 |
7445 | >= mddev->resync_max - mddev->curr_resync_completed | |
7446 | )) { | |
97e4f42d | 7447 | /* time to update curr_resync_completed */ |
97e4f42d N |
7448 | wait_event(mddev->recovery_wait, |
7449 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7450 | mddev->curr_resync_completed = j; |
35d78c66 | 7451 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
7452 | j > mddev->recovery_cp) | |
7453 | mddev->recovery_cp = j; | |
54f89341 | 7454 | update_time = jiffies; |
070dc6dd | 7455 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7456 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7457 | } |
acb180b0 | 7458 | |
c91abf5a N |
7459 | while (j >= mddev->resync_max && |
7460 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
7461 | /* As this condition is controlled by user-space, |
7462 | * we can block indefinitely, so use '_interruptible' | |
7463 | * to avoid triggering warnings. | |
7464 | */ | |
7465 | flush_signals(current); /* just in case */ | |
7466 | wait_event_interruptible(mddev->recovery_wait, | |
7467 | mddev->resync_max > j | |
c91abf5a N |
7468 | || test_bit(MD_RECOVERY_INTR, |
7469 | &mddev->recovery)); | |
e62e58a5 | 7470 | } |
acb180b0 | 7471 | |
c91abf5a N |
7472 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7473 | break; | |
acb180b0 | 7474 | |
57afd89f | 7475 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7476 | currspeed < speed_min(mddev)); |
57afd89f | 7477 | if (sectors == 0) { |
dfc70645 | 7478 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 7479 | break; |
1da177e4 | 7480 | } |
57afd89f N |
7481 | |
7482 | if (!skipped) { /* actual IO requested */ | |
7483 | io_sectors += sectors; | |
7484 | atomic_add(sectors, &mddev->recovery_active); | |
7485 | } | |
7486 | ||
e875ecea N |
7487 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7488 | break; | |
7489 | ||
1da177e4 | 7490 | j += sectors; |
72f36d59 N |
7491 | if (j > 2) |
7492 | mddev->curr_resync = j; | |
ff4e8d9a | 7493 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7494 | if (last_check == 0) |
e875ecea | 7495 | /* this is the earliest that rebuild will be |
d7603b7e N |
7496 | * visible in /proc/mdstat |
7497 | */ | |
7498 | md_new_event(mddev); | |
57afd89f N |
7499 | |
7500 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7501 | continue; |
7502 | ||
57afd89f | 7503 | last_check = io_sectors; |
1da177e4 LT |
7504 | repeat: |
7505 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7506 | /* step marks */ | |
7507 | int next = (last_mark+1) % SYNC_MARKS; | |
7508 | ||
7509 | mddev->resync_mark = mark[next]; | |
7510 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7511 | mark[next] = jiffies; | |
57afd89f | 7512 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7513 | last_mark = next; |
7514 | } | |
7515 | ||
c91abf5a N |
7516 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7517 | break; | |
1da177e4 LT |
7518 | |
7519 | /* | |
7520 | * this loop exits only if either when we are slower than | |
7521 | * the 'hard' speed limit, or the system was IO-idle for | |
7522 | * a jiffy. | |
7523 | * the system might be non-idle CPU-wise, but we only care | |
7524 | * about not overloading the IO subsystem. (things like an | |
7525 | * e2fsck being done on the RAID array should execute fast) | |
7526 | */ | |
1da177e4 LT |
7527 | cond_resched(); |
7528 | ||
ac7e50a3 XN |
7529 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
7530 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 7531 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 7532 | |
88202a0c N |
7533 | if (currspeed > speed_min(mddev)) { |
7534 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7535 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7536 | msleep(500); |
1da177e4 LT |
7537 | goto repeat; |
7538 | } | |
7539 | } | |
7540 | } | |
c91abf5a N |
7541 | printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
7542 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
7543 | ? "interrupted" : "done"); | |
1da177e4 LT |
7544 | /* |
7545 | * this also signals 'finished resyncing' to md_stop | |
7546 | */ | |
7c2c57c9 | 7547 | blk_finish_plug(&plug); |
1da177e4 LT |
7548 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7549 | ||
7550 | /* tell personality that we are finished */ | |
57afd89f | 7551 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7552 | |
dfc70645 | 7553 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7554 | mddev->curr_resync > 2) { |
7555 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7556 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7557 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7558 | printk(KERN_INFO | |
61df9d91 N |
7559 | "md: checkpointing %s of %s.\n", |
7560 | desc, mdname(mddev)); | |
0a19caab | 7561 | if (test_bit(MD_RECOVERY_ERROR, |
7562 | &mddev->recovery)) | |
7563 | mddev->recovery_cp = | |
7564 | mddev->curr_resync_completed; | |
7565 | else | |
7566 | mddev->recovery_cp = | |
7567 | mddev->curr_resync; | |
5fd6c1dc N |
7568 | } |
7569 | } else | |
7570 | mddev->recovery_cp = MaxSector; | |
7571 | } else { | |
7572 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7573 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 7574 | rcu_read_lock(); |
dafb20fa | 7575 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7576 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7577 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7578 | !test_bit(Faulty, &rdev->flags) && |
7579 | !test_bit(In_sync, &rdev->flags) && | |
7580 | rdev->recovery_offset < mddev->curr_resync) | |
7581 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7582 | rcu_read_unlock(); |
5fd6c1dc | 7583 | } |
1da177e4 | 7584 | } |
db91ff55 | 7585 | skip: |
17571284 | 7586 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7587 | |
c07b70ad N |
7588 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7589 | /* We completed so min/max setting can be forgotten if used. */ | |
7590 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7591 | mddev->resync_min = 0; | |
7592 | mddev->resync_max = MaxSector; | |
7593 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7594 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7595 | mddev->curr_resync = 0; |
7596 | wake_up(&resync_wait); | |
7597 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7598 | md_wakeup_thread(mddev->thread); | |
c6207277 | 7599 | return; |
1da177e4 | 7600 | } |
29269553 | 7601 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7602 | |
746d3207 N |
7603 | static int remove_and_add_spares(struct mddev *mddev, |
7604 | struct md_rdev *this) | |
b4c4c7b8 | 7605 | { |
3cb03002 | 7606 | struct md_rdev *rdev; |
b4c4c7b8 | 7607 | int spares = 0; |
f2a371c5 | 7608 | int removed = 0; |
b4c4c7b8 | 7609 | |
dafb20fa | 7610 | rdev_for_each(rdev, mddev) |
746d3207 N |
7611 | if ((this == NULL || rdev == this) && |
7612 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 7613 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7614 | (test_bit(Faulty, &rdev->flags) || |
7615 | ! test_bit(In_sync, &rdev->flags)) && | |
7616 | atomic_read(&rdev->nr_pending)==0) { | |
7617 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7618 | mddev, rdev) == 0) { |
36fad858 | 7619 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 7620 | rdev->raid_disk = -1; |
f2a371c5 | 7621 | removed++; |
b4c4c7b8 N |
7622 | } |
7623 | } | |
90584fc9 JB |
7624 | if (removed && mddev->kobj.sd) |
7625 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 7626 | |
746d3207 N |
7627 | if (this) |
7628 | goto no_add; | |
7629 | ||
dafb20fa | 7630 | rdev_for_each(rdev, mddev) { |
7bfec5f3 N |
7631 | if (rdev->raid_disk >= 0 && |
7632 | !test_bit(In_sync, &rdev->flags) && | |
7633 | !test_bit(Faulty, &rdev->flags)) | |
7634 | spares++; | |
7ceb17e8 N |
7635 | if (rdev->raid_disk >= 0) |
7636 | continue; | |
7637 | if (test_bit(Faulty, &rdev->flags)) | |
7638 | continue; | |
7639 | if (mddev->ro && | |
8313b8e5 N |
7640 | ! (rdev->saved_raid_disk >= 0 && |
7641 | !test_bit(Bitmap_sync, &rdev->flags))) | |
7ceb17e8 N |
7642 | continue; |
7643 | ||
7eb41885 N |
7644 | if (rdev->saved_raid_disk < 0) |
7645 | rdev->recovery_offset = 0; | |
7ceb17e8 N |
7646 | if (mddev->pers-> |
7647 | hot_add_disk(mddev, rdev) == 0) { | |
7648 | if (sysfs_link_rdev(mddev, rdev)) | |
7649 | /* failure here is OK */; | |
7650 | spares++; | |
7651 | md_new_event(mddev); | |
7652 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 7653 | } |
b4c4c7b8 | 7654 | } |
746d3207 | 7655 | no_add: |
6dafab6b N |
7656 | if (removed) |
7657 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
7658 | return spares; |
7659 | } | |
7ebc0be7 | 7660 | |
ac05f256 N |
7661 | static void md_start_sync(struct work_struct *ws) |
7662 | { | |
7663 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
7664 | ||
7665 | mddev->sync_thread = md_register_thread(md_do_sync, | |
7666 | mddev, | |
7667 | "resync"); | |
7668 | if (!mddev->sync_thread) { | |
7669 | printk(KERN_ERR "%s: could not start resync" | |
7670 | " thread...\n", | |
7671 | mdname(mddev)); | |
7672 | /* leave the spares where they are, it shouldn't hurt */ | |
7673 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7674 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7675 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7676 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7677 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7678 | wake_up(&resync_wait); |
ac05f256 N |
7679 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
7680 | &mddev->recovery)) | |
7681 | if (mddev->sysfs_action) | |
7682 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7683 | } else | |
7684 | md_wakeup_thread(mddev->sync_thread); | |
7685 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7686 | md_new_event(mddev); | |
7687 | } | |
7688 | ||
1da177e4 LT |
7689 | /* |
7690 | * This routine is regularly called by all per-raid-array threads to | |
7691 | * deal with generic issues like resync and super-block update. | |
7692 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7693 | * need this as they never do any recovery or update the superblock. | |
7694 | * | |
7695 | * It does not do any resync itself, but rather "forks" off other threads | |
7696 | * to do that as needed. | |
7697 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7698 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7699 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7700 | * and wakeups up this thread which will reap the thread and finish up. |
7701 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7702 | * | |
7703 | * The overall approach is: | |
7704 | * 1/ if the superblock needs updating, update it. | |
7705 | * 2/ If a recovery thread is running, don't do anything else. | |
7706 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7707 | * 4/ If there are any faulty devices, remove them. | |
7708 | * 5/ If array is degraded, try to add spares devices | |
7709 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7710 | */ | |
fd01b88c | 7711 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 7712 | { |
68866e42 JB |
7713 | if (mddev->suspended) |
7714 | return; | |
7715 | ||
5f40402d | 7716 | if (mddev->bitmap) |
aa5cbd10 | 7717 | bitmap_daemon_work(mddev); |
1da177e4 | 7718 | |
fca4d848 | 7719 | if (signal_pending(current)) { |
31a59e34 | 7720 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7721 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7722 | mdname(mddev)); | |
7723 | mddev->safemode = 2; | |
7724 | } | |
7725 | flush_signals(current); | |
7726 | } | |
7727 | ||
c89a8eee N |
7728 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7729 | return; | |
1da177e4 | 7730 | if ( ! ( |
142d44c3 | 7731 | (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7732 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7733 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7734 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7735 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7736 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7737 | )) |
7738 | return; | |
fca4d848 | 7739 | |
df5b89b3 | 7740 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7741 | int spares = 0; |
fca4d848 | 7742 | |
c89a8eee | 7743 | if (mddev->ro) { |
7ceb17e8 N |
7744 | /* On a read-only array we can: |
7745 | * - remove failed devices | |
7746 | * - add already-in_sync devices if the array itself | |
7747 | * is in-sync. | |
7748 | * As we only add devices that are already in-sync, | |
7749 | * we can activate the spares immediately. | |
c89a8eee | 7750 | */ |
7ceb17e8 | 7751 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
7752 | /* There is no thread, but we need to call |
7753 | * ->spare_active and clear saved_raid_disk | |
7754 | */ | |
2ac295a5 | 7755 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 N |
7756 | md_reap_sync_thread(mddev); |
7757 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
c89a8eee N |
7758 | goto unlock; |
7759 | } | |
7760 | ||
31a59e34 | 7761 | if (!mddev->external) { |
0fd62b86 | 7762 | int did_change = 0; |
85572d7c | 7763 | spin_lock(&mddev->lock); |
31a59e34 N |
7764 | if (mddev->safemode && |
7765 | !atomic_read(&mddev->writes_pending) && | |
7766 | !mddev->in_sync && | |
7767 | mddev->recovery_cp == MaxSector) { | |
7768 | mddev->in_sync = 1; | |
0fd62b86 | 7769 | did_change = 1; |
070dc6dd | 7770 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7771 | } |
7772 | if (mddev->safemode == 1) | |
7773 | mddev->safemode = 0; | |
85572d7c | 7774 | spin_unlock(&mddev->lock); |
0fd62b86 | 7775 | if (did_change) |
00bcb4ac | 7776 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7777 | } |
fca4d848 | 7778 | |
7a0a5355 | 7779 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 7780 | md_update_sb(mddev, 0); |
06d91a5f | 7781 | |
1da177e4 LT |
7782 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7783 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7784 | /* resync/recovery still happening */ | |
7785 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7786 | goto unlock; | |
7787 | } | |
7788 | if (mddev->sync_thread) { | |
a91d5ac0 | 7789 | md_reap_sync_thread(mddev); |
1da177e4 LT |
7790 | goto unlock; |
7791 | } | |
72a23c21 NB |
7792 | /* Set RUNNING before clearing NEEDED to avoid |
7793 | * any transients in the value of "sync_action". | |
7794 | */ | |
72f36d59 | 7795 | mddev->curr_resync_completed = 0; |
72a23c21 | 7796 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
24dd469d N |
7797 | /* Clear some bits that don't mean anything, but |
7798 | * might be left set | |
7799 | */ | |
24dd469d N |
7800 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7801 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7802 | |
ed209584 N |
7803 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
7804 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 7805 | goto not_running; |
1da177e4 LT |
7806 | /* no recovery is running. |
7807 | * remove any failed drives, then | |
7808 | * add spares if possible. | |
72f36d59 | 7809 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
7810 | * the personality to fail the re-add. |
7811 | */ | |
1da177e4 | 7812 | |
b4c4c7b8 | 7813 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7814 | if (mddev->pers->check_reshape == NULL || |
7815 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 7816 | /* Cannot proceed */ |
ac05f256 | 7817 | goto not_running; |
b4c4c7b8 | 7818 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 7819 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 7820 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
7821 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7822 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7823 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7824 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7825 | } else if (mddev->recovery_cp < MaxSector) { |
7826 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7827 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7828 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7829 | /* nothing to be done ... */ | |
ac05f256 | 7830 | goto not_running; |
24dd469d | 7831 | |
1da177e4 | 7832 | if (mddev->pers->sync_request) { |
ef99bf48 | 7833 | if (spares) { |
a654b9d8 N |
7834 | /* We are adding a device or devices to an array |
7835 | * which has the bitmap stored on all devices. | |
7836 | * So make sure all bitmap pages get written | |
7837 | */ | |
7838 | bitmap_write_all(mddev->bitmap); | |
7839 | } | |
ac05f256 N |
7840 | INIT_WORK(&mddev->del_work, md_start_sync); |
7841 | queue_work(md_misc_wq, &mddev->del_work); | |
7842 | goto unlock; | |
1da177e4 | 7843 | } |
ac05f256 | 7844 | not_running: |
72a23c21 NB |
7845 | if (!mddev->sync_thread) { |
7846 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 7847 | wake_up(&resync_wait); |
72a23c21 NB |
7848 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
7849 | &mddev->recovery)) | |
0c3573f1 | 7850 | if (mddev->sysfs_action) |
00bcb4ac | 7851 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7852 | } |
ac05f256 N |
7853 | unlock: |
7854 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
7855 | mddev_unlock(mddev); |
7856 | } | |
7857 | } | |
6c144d31 | 7858 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 7859 | |
a91d5ac0 JB |
7860 | void md_reap_sync_thread(struct mddev *mddev) |
7861 | { | |
7862 | struct md_rdev *rdev; | |
7863 | ||
7864 | /* resync has finished, collect result */ | |
7865 | md_unregister_thread(&mddev->sync_thread); | |
7866 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7867 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7868 | /* success...*/ | |
7869 | /* activate any spares */ | |
7870 | if (mddev->pers->spare_active(mddev)) { | |
7871 | sysfs_notify(&mddev->kobj, NULL, | |
7872 | "degraded"); | |
7873 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
7874 | } | |
7875 | } | |
7876 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7877 | mddev->pers->finish_reshape) | |
7878 | mddev->pers->finish_reshape(mddev); | |
7879 | ||
7880 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 7881 | * information must be scrapped. |
a91d5ac0 | 7882 | */ |
f466722c N |
7883 | if (!mddev->degraded) |
7884 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
7885 | rdev->saved_raid_disk = -1; |
7886 | ||
7887 | md_update_sb(mddev, 1); | |
7888 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7889 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7890 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7891 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7892 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 7893 | wake_up(&resync_wait); |
a91d5ac0 JB |
7894 | /* flag recovery needed just to double check */ |
7895 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7896 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7897 | md_new_event(mddev); | |
7898 | if (mddev->event_work.func) | |
7899 | queue_work(md_misc_wq, &mddev->event_work); | |
7900 | } | |
6c144d31 | 7901 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 7902 | |
fd01b88c | 7903 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 7904 | { |
00bcb4ac | 7905 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 7906 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
7907 | !test_bit(Blocked, &rdev->flags) && |
7908 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
7909 | msecs_to_jiffies(5000)); |
7910 | rdev_dec_pending(rdev, mddev); | |
7911 | } | |
7912 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7913 | ||
c6563a8c N |
7914 | void md_finish_reshape(struct mddev *mddev) |
7915 | { | |
7916 | /* called be personality module when reshape completes. */ | |
7917 | struct md_rdev *rdev; | |
7918 | ||
7919 | rdev_for_each(rdev, mddev) { | |
7920 | if (rdev->data_offset > rdev->new_data_offset) | |
7921 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
7922 | else | |
7923 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
7924 | rdev->data_offset = rdev->new_data_offset; | |
7925 | } | |
7926 | } | |
7927 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
7928 | |
7929 | /* Bad block management. | |
7930 | * We can record which blocks on each device are 'bad' and so just | |
7931 | * fail those blocks, or that stripe, rather than the whole device. | |
7932 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7933 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7934 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7935 | * A 'shift' can be set so that larger blocks are tracked and | |
7936 | * consequently larger devices can be covered. | |
7937 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7938 | * | |
7939 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7940 | * might need to retry if it is very unlucky. | |
7941 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7942 | * so we use the write_seqlock_irq variant. | |
7943 | * | |
7944 | * When looking for a bad block we specify a range and want to | |
7945 | * know if any block in the range is bad. So we binary-search | |
7946 | * to the last range that starts at-or-before the given endpoint, | |
7947 | * (or "before the sector after the target range") | |
7948 | * then see if it ends after the given start. | |
7949 | * We return | |
7950 | * 0 if there are no known bad blocks in the range | |
7951 | * 1 if there are known bad block which are all acknowledged | |
7952 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
7953 | * plus the start/length of the first bad section we overlap. | |
7954 | */ | |
7955 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
7956 | sector_t *first_bad, int *bad_sectors) | |
7957 | { | |
7958 | int hi; | |
ab05613a | 7959 | int lo; |
2230dfe4 | 7960 | u64 *p = bb->page; |
ab05613a | 7961 | int rv; |
2230dfe4 N |
7962 | sector_t target = s + sectors; |
7963 | unsigned seq; | |
7964 | ||
7965 | if (bb->shift > 0) { | |
7966 | /* round the start down, and the end up */ | |
7967 | s >>= bb->shift; | |
7968 | target += (1<<bb->shift) - 1; | |
7969 | target >>= bb->shift; | |
7970 | sectors = target - s; | |
7971 | } | |
7972 | /* 'target' is now the first block after the bad range */ | |
7973 | ||
7974 | retry: | |
7975 | seq = read_seqbegin(&bb->lock); | |
ab05613a | 7976 | lo = 0; |
7977 | rv = 0; | |
2230dfe4 N |
7978 | hi = bb->count; |
7979 | ||
7980 | /* Binary search between lo and hi for 'target' | |
7981 | * i.e. for the last range that starts before 'target' | |
7982 | */ | |
7983 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
7984 | * are known not to be the last range before target. | |
7985 | * VARIANT: hi-lo is the number of possible | |
7986 | * ranges, and decreases until it reaches 1 | |
7987 | */ | |
7988 | while (hi - lo > 1) { | |
7989 | int mid = (lo + hi) / 2; | |
7990 | sector_t a = BB_OFFSET(p[mid]); | |
7991 | if (a < target) | |
7992 | /* This could still be the one, earlier ranges | |
7993 | * could not. */ | |
7994 | lo = mid; | |
7995 | else | |
7996 | /* This and later ranges are definitely out. */ | |
7997 | hi = mid; | |
7998 | } | |
7999 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
8000 | if (hi > lo) { | |
8001 | /* need to check all range that end after 's' to see if | |
8002 | * any are unacknowledged. | |
8003 | */ | |
8004 | while (lo >= 0 && | |
8005 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8006 | if (BB_OFFSET(p[lo]) < target) { | |
8007 | /* starts before the end, and finishes after | |
8008 | * the start, so they must overlap | |
8009 | */ | |
8010 | if (rv != -1 && BB_ACK(p[lo])) | |
8011 | rv = 1; | |
8012 | else | |
8013 | rv = -1; | |
8014 | *first_bad = BB_OFFSET(p[lo]); | |
8015 | *bad_sectors = BB_LEN(p[lo]); | |
8016 | } | |
8017 | lo--; | |
8018 | } | |
8019 | } | |
8020 | ||
8021 | if (read_seqretry(&bb->lock, seq)) | |
8022 | goto retry; | |
8023 | ||
8024 | return rv; | |
8025 | } | |
8026 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
8027 | ||
8028 | /* | |
8029 | * Add a range of bad blocks to the table. | |
8030 | * This might extend the table, or might contract it | |
8031 | * if two adjacent ranges can be merged. | |
8032 | * We binary-search to find the 'insertion' point, then | |
8033 | * decide how best to handle it. | |
8034 | */ | |
8035 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
8036 | int acknowledged) | |
8037 | { | |
8038 | u64 *p; | |
8039 | int lo, hi; | |
8040 | int rv = 1; | |
905b0297 | 8041 | unsigned long flags; |
2230dfe4 N |
8042 | |
8043 | if (bb->shift < 0) | |
8044 | /* badblocks are disabled */ | |
8045 | return 0; | |
8046 | ||
8047 | if (bb->shift) { | |
8048 | /* round the start down, and the end up */ | |
8049 | sector_t next = s + sectors; | |
8050 | s >>= bb->shift; | |
8051 | next += (1<<bb->shift) - 1; | |
8052 | next >>= bb->shift; | |
8053 | sectors = next - s; | |
8054 | } | |
8055 | ||
905b0297 | 8056 | write_seqlock_irqsave(&bb->lock, flags); |
2230dfe4 N |
8057 | |
8058 | p = bb->page; | |
8059 | lo = 0; | |
8060 | hi = bb->count; | |
8061 | /* Find the last range that starts at-or-before 's' */ | |
8062 | while (hi - lo > 1) { | |
8063 | int mid = (lo + hi) / 2; | |
8064 | sector_t a = BB_OFFSET(p[mid]); | |
8065 | if (a <= s) | |
8066 | lo = mid; | |
8067 | else | |
8068 | hi = mid; | |
8069 | } | |
8070 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8071 | hi = lo; | |
8072 | ||
8073 | if (hi > lo) { | |
8074 | /* we found a range that might merge with the start | |
8075 | * of our new range | |
8076 | */ | |
8077 | sector_t a = BB_OFFSET(p[lo]); | |
8078 | sector_t e = a + BB_LEN(p[lo]); | |
8079 | int ack = BB_ACK(p[lo]); | |
8080 | if (e >= s) { | |
8081 | /* Yes, we can merge with a previous range */ | |
8082 | if (s == a && s + sectors >= e) | |
8083 | /* new range covers old */ | |
8084 | ack = acknowledged; | |
8085 | else | |
8086 | ack = ack && acknowledged; | |
8087 | ||
8088 | if (e < s + sectors) | |
8089 | e = s + sectors; | |
8090 | if (e - a <= BB_MAX_LEN) { | |
8091 | p[lo] = BB_MAKE(a, e-a, ack); | |
8092 | s = e; | |
8093 | } else { | |
8094 | /* does not all fit in one range, | |
8095 | * make p[lo] maximal | |
8096 | */ | |
8097 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8098 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8099 | s = a + BB_MAX_LEN; | |
8100 | } | |
8101 | sectors = e - s; | |
8102 | } | |
8103 | } | |
8104 | if (sectors && hi < bb->count) { | |
8105 | /* 'hi' points to the first range that starts after 's'. | |
8106 | * Maybe we can merge with the start of that range */ | |
8107 | sector_t a = BB_OFFSET(p[hi]); | |
8108 | sector_t e = a + BB_LEN(p[hi]); | |
8109 | int ack = BB_ACK(p[hi]); | |
8110 | if (a <= s + sectors) { | |
8111 | /* merging is possible */ | |
8112 | if (e <= s + sectors) { | |
8113 | /* full overlap */ | |
8114 | e = s + sectors; | |
8115 | ack = acknowledged; | |
8116 | } else | |
8117 | ack = ack && acknowledged; | |
8118 | ||
8119 | a = s; | |
8120 | if (e - a <= BB_MAX_LEN) { | |
8121 | p[hi] = BB_MAKE(a, e-a, ack); | |
8122 | s = e; | |
8123 | } else { | |
8124 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8125 | s = a + BB_MAX_LEN; | |
8126 | } | |
8127 | sectors = e - s; | |
8128 | lo = hi; | |
8129 | hi++; | |
8130 | } | |
8131 | } | |
8132 | if (sectors == 0 && hi < bb->count) { | |
8133 | /* we might be able to combine lo and hi */ | |
8134 | /* Note: 's' is at the end of 'lo' */ | |
8135 | sector_t a = BB_OFFSET(p[hi]); | |
8136 | int lolen = BB_LEN(p[lo]); | |
8137 | int hilen = BB_LEN(p[hi]); | |
8138 | int newlen = lolen + hilen - (s - a); | |
8139 | if (s >= a && newlen < BB_MAX_LEN) { | |
8140 | /* yes, we can combine them */ | |
8141 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8142 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8143 | memmove(p + hi, p + hi + 1, | |
8144 | (bb->count - hi - 1) * 8); | |
8145 | bb->count--; | |
8146 | } | |
8147 | } | |
8148 | while (sectors) { | |
8149 | /* didn't merge (it all). | |
8150 | * Need to add a range just before 'hi' */ | |
8151 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8152 | /* No room for more */ | |
8153 | rv = 0; | |
8154 | break; | |
8155 | } else { | |
8156 | int this_sectors = sectors; | |
8157 | memmove(p + hi + 1, p + hi, | |
8158 | (bb->count - hi) * 8); | |
8159 | bb->count++; | |
8160 | ||
8161 | if (this_sectors > BB_MAX_LEN) | |
8162 | this_sectors = BB_MAX_LEN; | |
8163 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8164 | sectors -= this_sectors; | |
8165 | s += this_sectors; | |
8166 | } | |
8167 | } | |
8168 | ||
8169 | bb->changed = 1; | |
de393cde N |
8170 | if (!acknowledged) |
8171 | bb->unacked_exist = 1; | |
905b0297 | 8172 | write_sequnlock_irqrestore(&bb->lock, flags); |
2230dfe4 N |
8173 | |
8174 | return rv; | |
8175 | } | |
8176 | ||
3cb03002 | 8177 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8178 | int is_new) |
2230dfe4 | 8179 | { |
c6563a8c N |
8180 | int rv; |
8181 | if (is_new) | |
8182 | s += rdev->new_data_offset; | |
8183 | else | |
8184 | s += rdev->data_offset; | |
8185 | rv = md_set_badblocks(&rdev->badblocks, | |
8186 | s, sectors, 0); | |
2230dfe4 N |
8187 | if (rv) { |
8188 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8189 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 N |
8190 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
8191 | md_wakeup_thread(rdev->mddev->thread); | |
8192 | } | |
8193 | return rv; | |
8194 | } | |
8195 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8196 | ||
8197 | /* | |
8198 | * Remove a range of bad blocks from the table. | |
8199 | * This may involve extending the table if we spilt a region, | |
8200 | * but it must not fail. So if the table becomes full, we just | |
8201 | * drop the remove request. | |
8202 | */ | |
8203 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8204 | { | |
8205 | u64 *p; | |
8206 | int lo, hi; | |
8207 | sector_t target = s + sectors; | |
8208 | int rv = 0; | |
8209 | ||
8210 | if (bb->shift > 0) { | |
8211 | /* When clearing we round the start up and the end down. | |
8212 | * This should not matter as the shift should align with | |
8213 | * the block size and no rounding should ever be needed. | |
8214 | * However it is better the think a block is bad when it | |
8215 | * isn't than to think a block is not bad when it is. | |
8216 | */ | |
8217 | s += (1<<bb->shift) - 1; | |
8218 | s >>= bb->shift; | |
8219 | target >>= bb->shift; | |
8220 | sectors = target - s; | |
8221 | } | |
8222 | ||
8223 | write_seqlock_irq(&bb->lock); | |
8224 | ||
8225 | p = bb->page; | |
8226 | lo = 0; | |
8227 | hi = bb->count; | |
8228 | /* Find the last range that starts before 'target' */ | |
8229 | while (hi - lo > 1) { | |
8230 | int mid = (lo + hi) / 2; | |
8231 | sector_t a = BB_OFFSET(p[mid]); | |
8232 | if (a < target) | |
8233 | lo = mid; | |
8234 | else | |
8235 | hi = mid; | |
8236 | } | |
8237 | if (hi > lo) { | |
8238 | /* p[lo] is the last range that could overlap the | |
8239 | * current range. Earlier ranges could also overlap, | |
8240 | * but only this one can overlap the end of the range. | |
8241 | */ | |
8242 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8243 | /* Partial overlap, leave the tail of this range */ | |
8244 | int ack = BB_ACK(p[lo]); | |
8245 | sector_t a = BB_OFFSET(p[lo]); | |
8246 | sector_t end = a + BB_LEN(p[lo]); | |
8247 | ||
8248 | if (a < s) { | |
8249 | /* we need to split this range */ | |
8250 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8b32bf5e | 8251 | rv = -ENOSPC; |
2230dfe4 N |
8252 | goto out; |
8253 | } | |
8254 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8255 | bb->count++; | |
8256 | p[lo] = BB_MAKE(a, s-a, ack); | |
8257 | lo++; | |
8258 | } | |
8259 | p[lo] = BB_MAKE(target, end - target, ack); | |
8260 | /* there is no longer an overlap */ | |
8261 | hi = lo; | |
8262 | lo--; | |
8263 | } | |
8264 | while (lo >= 0 && | |
8265 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8266 | /* This range does overlap */ | |
8267 | if (BB_OFFSET(p[lo]) < s) { | |
8268 | /* Keep the early parts of this range. */ | |
8269 | int ack = BB_ACK(p[lo]); | |
8270 | sector_t start = BB_OFFSET(p[lo]); | |
8271 | p[lo] = BB_MAKE(start, s - start, ack); | |
8272 | /* now low doesn't overlap, so.. */ | |
8273 | break; | |
8274 | } | |
8275 | lo--; | |
8276 | } | |
8277 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8278 | * anything between needs to be discarded | |
8279 | */ | |
8280 | if (hi - lo > 1) { | |
8281 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8282 | bb->count -= (hi - lo - 1); | |
8283 | } | |
8284 | } | |
8285 | ||
8286 | bb->changed = 1; | |
8287 | out: | |
8288 | write_sequnlock_irq(&bb->lock); | |
8289 | return rv; | |
8290 | } | |
8291 | ||
c6563a8c N |
8292 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8293 | int is_new) | |
2230dfe4 | 8294 | { |
c6563a8c N |
8295 | if (is_new) |
8296 | s += rdev->new_data_offset; | |
8297 | else | |
8298 | s += rdev->data_offset; | |
2230dfe4 | 8299 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8300 | s, sectors); |
2230dfe4 N |
8301 | } |
8302 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8303 | ||
8304 | /* | |
8305 | * Acknowledge all bad blocks in a list. | |
8306 | * This only succeeds if ->changed is clear. It is used by | |
8307 | * in-kernel metadata updates | |
8308 | */ | |
8309 | void md_ack_all_badblocks(struct badblocks *bb) | |
8310 | { | |
8311 | if (bb->page == NULL || bb->changed) | |
8312 | /* no point even trying */ | |
8313 | return; | |
8314 | write_seqlock_irq(&bb->lock); | |
8315 | ||
ecb178bb | 8316 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8317 | u64 *p = bb->page; |
8318 | int i; | |
8319 | for (i = 0; i < bb->count ; i++) { | |
8320 | if (!BB_ACK(p[i])) { | |
8321 | sector_t start = BB_OFFSET(p[i]); | |
8322 | int len = BB_LEN(p[i]); | |
8323 | p[i] = BB_MAKE(start, len, 1); | |
8324 | } | |
8325 | } | |
de393cde | 8326 | bb->unacked_exist = 0; |
2230dfe4 N |
8327 | } |
8328 | write_sequnlock_irq(&bb->lock); | |
8329 | } | |
8330 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8331 | ||
16c791a5 N |
8332 | /* sysfs access to bad-blocks list. |
8333 | * We present two files. | |
8334 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8335 | * are recorded as bad. The list is truncated to fit within | |
8336 | * the one-page limit of sysfs. | |
8337 | * Writing "sector length" to this file adds an acknowledged | |
8338 | * bad block list. | |
8339 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8340 | * been acknowledged. Writing to this file adds bad blocks | |
8341 | * without acknowledging them. This is largely for testing. | |
8342 | */ | |
8343 | ||
8344 | static ssize_t | |
8345 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8346 | { | |
8347 | size_t len; | |
8348 | int i; | |
8349 | u64 *p = bb->page; | |
8350 | unsigned seq; | |
8351 | ||
8352 | if (bb->shift < 0) | |
8353 | return 0; | |
8354 | ||
8355 | retry: | |
8356 | seq = read_seqbegin(&bb->lock); | |
8357 | ||
8358 | len = 0; | |
8359 | i = 0; | |
8360 | ||
8361 | while (len < PAGE_SIZE && i < bb->count) { | |
8362 | sector_t s = BB_OFFSET(p[i]); | |
8363 | unsigned int length = BB_LEN(p[i]); | |
8364 | int ack = BB_ACK(p[i]); | |
8365 | i++; | |
8366 | ||
8367 | if (unack && ack) | |
8368 | continue; | |
8369 | ||
8370 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8371 | (unsigned long long)s << bb->shift, | |
8372 | length << bb->shift); | |
8373 | } | |
de393cde N |
8374 | if (unack && len == 0) |
8375 | bb->unacked_exist = 0; | |
16c791a5 N |
8376 | |
8377 | if (read_seqretry(&bb->lock, seq)) | |
8378 | goto retry; | |
8379 | ||
8380 | return len; | |
8381 | } | |
8382 | ||
8383 | #define DO_DEBUG 1 | |
8384 | ||
8385 | static ssize_t | |
8386 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8387 | { | |
8388 | unsigned long long sector; | |
8389 | int length; | |
8390 | char newline; | |
8391 | #ifdef DO_DEBUG | |
8392 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8393 | * Normally only a successful write may clear a badblock | |
8394 | */ | |
8395 | int clear = 0; | |
8396 | if (page[0] == '-') { | |
8397 | clear = 1; | |
8398 | page++; | |
8399 | } | |
8400 | #endif /* DO_DEBUG */ | |
8401 | ||
8402 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8403 | case 3: | |
8404 | if (newline != '\n') | |
8405 | return -EINVAL; | |
8406 | case 2: | |
8407 | if (length <= 0) | |
8408 | return -EINVAL; | |
8409 | break; | |
8410 | default: | |
8411 | return -EINVAL; | |
8412 | } | |
8413 | ||
8414 | #ifdef DO_DEBUG | |
8415 | if (clear) { | |
8416 | md_clear_badblocks(bb, sector, length); | |
8417 | return len; | |
8418 | } | |
8419 | #endif /* DO_DEBUG */ | |
8420 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8421 | return len; | |
8422 | else | |
8423 | return -ENOSPC; | |
8424 | } | |
8425 | ||
75c96f85 AB |
8426 | static int md_notify_reboot(struct notifier_block *this, |
8427 | unsigned long code, void *x) | |
1da177e4 LT |
8428 | { |
8429 | struct list_head *tmp; | |
fd01b88c | 8430 | struct mddev *mddev; |
2dba6a91 | 8431 | int need_delay = 0; |
1da177e4 | 8432 | |
c744a65c N |
8433 | for_each_mddev(mddev, tmp) { |
8434 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8435 | if (mddev->pers) |
8436 | __md_stop_writes(mddev); | |
0f62fb22 N |
8437 | if (mddev->persistent) |
8438 | mddev->safemode = 2; | |
c744a65c | 8439 | mddev_unlock(mddev); |
2dba6a91 | 8440 | } |
c744a65c | 8441 | need_delay = 1; |
1da177e4 | 8442 | } |
c744a65c N |
8443 | /* |
8444 | * certain more exotic SCSI devices are known to be | |
8445 | * volatile wrt too early system reboots. While the | |
8446 | * right place to handle this issue is the given | |
8447 | * driver, we do want to have a safe RAID driver ... | |
8448 | */ | |
8449 | if (need_delay) | |
8450 | mdelay(1000*1); | |
8451 | ||
1da177e4 LT |
8452 | return NOTIFY_DONE; |
8453 | } | |
8454 | ||
75c96f85 | 8455 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8456 | .notifier_call = md_notify_reboot, |
8457 | .next = NULL, | |
8458 | .priority = INT_MAX, /* before any real devices */ | |
8459 | }; | |
8460 | ||
8461 | static void md_geninit(void) | |
8462 | { | |
36a4e1fe | 8463 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8464 | |
c7705f34 | 8465 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8466 | } |
8467 | ||
75c96f85 | 8468 | static int __init md_init(void) |
1da177e4 | 8469 | { |
e804ac78 TH |
8470 | int ret = -ENOMEM; |
8471 | ||
ada609ee | 8472 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8473 | if (!md_wq) |
8474 | goto err_wq; | |
8475 | ||
8476 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8477 | if (!md_misc_wq) | |
8478 | goto err_misc_wq; | |
8479 | ||
8480 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8481 | goto err_md; | |
8482 | ||
8483 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8484 | goto err_mdp; | |
8485 | mdp_major = ret; | |
8486 | ||
af5628f0 | 8487 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
8488 | md_probe, NULL, NULL); |
8489 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8490 | md_probe, NULL, NULL); |
8491 | ||
1da177e4 | 8492 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8493 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8494 | |
8495 | md_geninit(); | |
d710e138 | 8496 | return 0; |
1da177e4 | 8497 | |
e804ac78 TH |
8498 | err_mdp: |
8499 | unregister_blkdev(MD_MAJOR, "md"); | |
8500 | err_md: | |
8501 | destroy_workqueue(md_misc_wq); | |
8502 | err_misc_wq: | |
8503 | destroy_workqueue(md_wq); | |
8504 | err_wq: | |
8505 | return ret; | |
8506 | } | |
1da177e4 LT |
8507 | |
8508 | #ifndef MODULE | |
8509 | ||
8510 | /* | |
8511 | * Searches all registered partitions for autorun RAID arrays | |
8512 | * at boot time. | |
8513 | */ | |
4d936ec1 ME |
8514 | |
8515 | static LIST_HEAD(all_detected_devices); | |
8516 | struct detected_devices_node { | |
8517 | struct list_head list; | |
8518 | dev_t dev; | |
8519 | }; | |
1da177e4 LT |
8520 | |
8521 | void md_autodetect_dev(dev_t dev) | |
8522 | { | |
4d936ec1 ME |
8523 | struct detected_devices_node *node_detected_dev; |
8524 | ||
8525 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8526 | if (node_detected_dev) { | |
8527 | node_detected_dev->dev = dev; | |
8528 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8529 | } else { | |
8530 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8531 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8532 | } | |
1da177e4 LT |
8533 | } |
8534 | ||
1da177e4 LT |
8535 | static void autostart_arrays(int part) |
8536 | { | |
3cb03002 | 8537 | struct md_rdev *rdev; |
4d936ec1 ME |
8538 | struct detected_devices_node *node_detected_dev; |
8539 | dev_t dev; | |
8540 | int i_scanned, i_passed; | |
1da177e4 | 8541 | |
4d936ec1 ME |
8542 | i_scanned = 0; |
8543 | i_passed = 0; | |
1da177e4 | 8544 | |
4d936ec1 | 8545 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8546 | |
4d936ec1 ME |
8547 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8548 | i_scanned++; | |
8549 | node_detected_dev = list_entry(all_detected_devices.next, | |
8550 | struct detected_devices_node, list); | |
8551 | list_del(&node_detected_dev->list); | |
8552 | dev = node_detected_dev->dev; | |
8553 | kfree(node_detected_dev); | |
df968c4e | 8554 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8555 | if (IS_ERR(rdev)) |
8556 | continue; | |
8557 | ||
403df478 | 8558 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 8559 | continue; |
403df478 | 8560 | |
d0fae18f | 8561 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8562 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8563 | i_passed++; |
1da177e4 | 8564 | } |
4d936ec1 ME |
8565 | |
8566 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8567 | i_scanned, i_passed); | |
1da177e4 LT |
8568 | |
8569 | autorun_devices(part); | |
8570 | } | |
8571 | ||
fdee8ae4 | 8572 | #endif /* !MODULE */ |
1da177e4 LT |
8573 | |
8574 | static __exit void md_exit(void) | |
8575 | { | |
fd01b88c | 8576 | struct mddev *mddev; |
1da177e4 | 8577 | struct list_head *tmp; |
e2f23b60 | 8578 | int delay = 1; |
8ab5e4c1 | 8579 | |
af5628f0 | 8580 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 8581 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8582 | |
3dbd8c2e | 8583 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8584 | unregister_blkdev(mdp_major, "mdp"); |
8585 | unregister_reboot_notifier(&md_notifier); | |
8586 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
8587 | |
8588 | /* We cannot unload the modules while some process is | |
8589 | * waiting for us in select() or poll() - wake them up | |
8590 | */ | |
8591 | md_unloading = 1; | |
8592 | while (waitqueue_active(&md_event_waiters)) { | |
8593 | /* not safe to leave yet */ | |
8594 | wake_up(&md_event_waiters); | |
8595 | msleep(delay); | |
8596 | delay += delay; | |
8597 | } | |
1da177e4 | 8598 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 8599 | |
29ac4aa3 | 8600 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8601 | export_array(mddev); |
d3374825 | 8602 | mddev->hold_active = 0; |
1da177e4 | 8603 | } |
e804ac78 TH |
8604 | destroy_workqueue(md_misc_wq); |
8605 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8606 | } |
8607 | ||
685784aa | 8608 | subsys_initcall(md_init); |
1da177e4 LT |
8609 | module_exit(md_exit) |
8610 | ||
f91de92e N |
8611 | static int get_ro(char *buffer, struct kernel_param *kp) |
8612 | { | |
8613 | return sprintf(buffer, "%d", start_readonly); | |
8614 | } | |
8615 | static int set_ro(const char *val, struct kernel_param *kp) | |
8616 | { | |
8617 | char *e; | |
8618 | int num = simple_strtoul(val, &e, 10); | |
8619 | if (*val && (*e == '\0' || *e == '\n')) { | |
8620 | start_readonly = num; | |
4dbcdc75 | 8621 | return 0; |
f91de92e N |
8622 | } |
8623 | return -EINVAL; | |
8624 | } | |
8625 | ||
80ca3a44 N |
8626 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8627 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 8628 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8629 | |
1da177e4 | 8630 | MODULE_LICENSE("GPL"); |
0efb9e61 | 8631 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8632 | MODULE_ALIAS("md"); |
72008652 | 8633 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |