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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" |
edb39c9d | 56 | #include "md-cluster.h" |
1da177e4 | 57 | |
1da177e4 | 58 | #ifndef MODULE |
d710e138 | 59 | static void autostart_arrays(int part); |
1da177e4 LT |
60 | #endif |
61 | ||
01f96c0a N |
62 | /* pers_list is a list of registered personalities protected |
63 | * by pers_lock. | |
64 | * pers_lock does extra service to protect accesses to | |
65 | * mddev->thread when the mutex cannot be held. | |
66 | */ | |
2604b703 | 67 | static LIST_HEAD(pers_list); |
1da177e4 LT |
68 | static DEFINE_SPINLOCK(pers_lock); |
69 | ||
edb39c9d | 70 | struct md_cluster_operations *md_cluster_ops; |
589a1c49 | 71 | EXPORT_SYMBOL(md_cluster_ops); |
edb39c9d GR |
72 | struct module *md_cluster_mod; |
73 | EXPORT_SYMBOL(md_cluster_mod); | |
74 | ||
90b08710 | 75 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
76 | static struct workqueue_struct *md_wq; |
77 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 78 | |
746d3207 N |
79 | static int remove_and_add_spares(struct mddev *mddev, |
80 | struct md_rdev *this); | |
5aa61f42 | 81 | static void mddev_detach(struct mddev *mddev); |
746d3207 | 82 | |
1e50915f RB |
83 | /* |
84 | * Default number of read corrections we'll attempt on an rdev | |
85 | * before ejecting it from the array. We divide the read error | |
86 | * count by 2 for every hour elapsed between read errors. | |
87 | */ | |
88 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
89 | /* |
90 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
91 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
92 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 93 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
94 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
95 | * speed limit - in case reconstruction slows down your system despite | |
96 | * idle IO detection. | |
97 | * | |
98 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 99 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
100 | */ |
101 | ||
102 | static int sysctl_speed_limit_min = 1000; | |
103 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 104 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
105 | { |
106 | return mddev->sync_speed_min ? | |
107 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
108 | } | |
109 | ||
fd01b88c | 110 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
111 | { |
112 | return mddev->sync_speed_max ? | |
113 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
114 | } | |
1da177e4 LT |
115 | |
116 | static struct ctl_table_header *raid_table_header; | |
117 | ||
82592c38 | 118 | static struct ctl_table raid_table[] = { |
1da177e4 | 119 | { |
1da177e4 LT |
120 | .procname = "speed_limit_min", |
121 | .data = &sysctl_speed_limit_min, | |
122 | .maxlen = sizeof(int), | |
80ca3a44 | 123 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 124 | .proc_handler = proc_dointvec, |
1da177e4 LT |
125 | }, |
126 | { | |
1da177e4 LT |
127 | .procname = "speed_limit_max", |
128 | .data = &sysctl_speed_limit_max, | |
129 | .maxlen = sizeof(int), | |
80ca3a44 | 130 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 131 | .proc_handler = proc_dointvec, |
1da177e4 | 132 | }, |
894d2491 | 133 | { } |
1da177e4 LT |
134 | }; |
135 | ||
82592c38 | 136 | static struct ctl_table raid_dir_table[] = { |
1da177e4 | 137 | { |
1da177e4 LT |
138 | .procname = "raid", |
139 | .maxlen = 0, | |
80ca3a44 | 140 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
141 | .child = raid_table, |
142 | }, | |
894d2491 | 143 | { } |
1da177e4 LT |
144 | }; |
145 | ||
82592c38 | 146 | static struct ctl_table raid_root_table[] = { |
1da177e4 | 147 | { |
1da177e4 LT |
148 | .procname = "dev", |
149 | .maxlen = 0, | |
150 | .mode = 0555, | |
151 | .child = raid_dir_table, | |
152 | }, | |
894d2491 | 153 | { } |
1da177e4 LT |
154 | }; |
155 | ||
83d5cde4 | 156 | static const struct block_device_operations md_fops; |
1da177e4 | 157 | |
f91de92e N |
158 | static int start_readonly; |
159 | ||
a167f663 N |
160 | /* bio_clone_mddev |
161 | * like bio_clone, but with a local bio set | |
162 | */ | |
163 | ||
a167f663 | 164 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 165 | struct mddev *mddev) |
a167f663 N |
166 | { |
167 | struct bio *b; | |
a167f663 N |
168 | |
169 | if (!mddev || !mddev->bio_set) | |
170 | return bio_alloc(gfp_mask, nr_iovecs); | |
171 | ||
395c72a7 | 172 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
173 | if (!b) |
174 | return NULL; | |
a167f663 N |
175 | return b; |
176 | } | |
177 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
178 | ||
179 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 180 | struct mddev *mddev) |
a167f663 | 181 | { |
a167f663 N |
182 | if (!mddev || !mddev->bio_set) |
183 | return bio_clone(bio, gfp_mask); | |
184 | ||
bf800ef1 | 185 | return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
a167f663 N |
186 | } |
187 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
188 | ||
d7603b7e N |
189 | /* |
190 | * We have a system wide 'event count' that is incremented | |
191 | * on any 'interesting' event, and readers of /proc/mdstat | |
192 | * can use 'poll' or 'select' to find out when the event | |
193 | * count increases. | |
194 | * | |
195 | * Events are: | |
196 | * start array, stop array, error, add device, remove device, | |
197 | * start build, activate spare | |
198 | */ | |
2989ddbd | 199 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 200 | static atomic_t md_event_count; |
fd01b88c | 201 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
202 | { |
203 | atomic_inc(&md_event_count); | |
204 | wake_up(&md_event_waiters); | |
205 | } | |
29269553 | 206 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 207 | |
c331eb04 N |
208 | /* Alternate version that can be called from interrupts |
209 | * when calling sysfs_notify isn't needed. | |
210 | */ | |
fd01b88c | 211 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
212 | { |
213 | atomic_inc(&md_event_count); | |
214 | wake_up(&md_event_waiters); | |
215 | } | |
216 | ||
1da177e4 LT |
217 | /* |
218 | * Enables to iterate over all existing md arrays | |
219 | * all_mddevs_lock protects this list. | |
220 | */ | |
221 | static LIST_HEAD(all_mddevs); | |
222 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
223 | ||
1da177e4 LT |
224 | /* |
225 | * iterates through all used mddevs in the system. | |
226 | * We take care to grab the all_mddevs_lock whenever navigating | |
227 | * the list, and to always hold a refcount when unlocked. | |
228 | * Any code which breaks out of this loop while own | |
229 | * a reference to the current mddev and must mddev_put it. | |
230 | */ | |
fd01b88c | 231 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 | 232 | \ |
f72ffdd6 | 233 | for (({ spin_lock(&all_mddevs_lock); \ |
fd01b88c N |
234 | _tmp = all_mddevs.next; \ |
235 | _mddev = NULL;}); \ | |
236 | ({ if (_tmp != &all_mddevs) \ | |
237 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 238 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
239 | if (_mddev) mddev_put(_mddev); \ |
240 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
241 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 242 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 243 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
244 | ) |
245 | ||
409c57f3 N |
246 | /* Rather than calling directly into the personality make_request function, |
247 | * IO requests come here first so that we can check if the device is | |
248 | * being suspended pending a reconfiguration. | |
249 | * We hold a refcount over the call to ->make_request. By the time that | |
250 | * call has finished, the bio has been linked into some internal structure | |
251 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
252 | */ | |
5a7bbad2 | 253 | static void md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 254 | { |
49077326 | 255 | const int rw = bio_data_dir(bio); |
fd01b88c | 256 | struct mddev *mddev = q->queuedata; |
e91ece55 | 257 | unsigned int sectors; |
74672d06 | 258 | int cpu; |
49077326 | 259 | |
54efd50b KO |
260 | blk_queue_split(q, &bio, q->bio_split); |
261 | ||
0ca69886 N |
262 | if (mddev == NULL || mddev->pers == NULL |
263 | || !mddev->ready) { | |
409c57f3 | 264 | bio_io_error(bio); |
5a7bbad2 | 265 | return; |
409c57f3 | 266 | } |
bbfa57c0 | 267 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
4246a0b6 CH |
268 | if (bio_sectors(bio) != 0) |
269 | bio->bi_error = -EROFS; | |
270 | bio_endio(bio); | |
bbfa57c0 SR |
271 | return; |
272 | } | |
0ca69886 | 273 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 274 | rcu_read_lock(); |
e9c7469b | 275 | if (mddev->suspended) { |
409c57f3 N |
276 | DEFINE_WAIT(__wait); |
277 | for (;;) { | |
278 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
279 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 280 | if (!mddev->suspended) |
409c57f3 N |
281 | break; |
282 | rcu_read_unlock(); | |
283 | schedule(); | |
284 | rcu_read_lock(); | |
285 | } | |
286 | finish_wait(&mddev->sb_wait, &__wait); | |
287 | } | |
288 | atomic_inc(&mddev->active_io); | |
289 | rcu_read_unlock(); | |
49077326 | 290 | |
e91ece55 CM |
291 | /* |
292 | * save the sectors now since our bio can | |
293 | * go away inside make_request | |
294 | */ | |
295 | sectors = bio_sectors(bio); | |
5a7bbad2 | 296 | mddev->pers->make_request(mddev, bio); |
49077326 | 297 | |
74672d06 GZ |
298 | cpu = part_stat_lock(); |
299 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
300 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); | |
301 | part_stat_unlock(); | |
49077326 | 302 | |
409c57f3 N |
303 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
304 | wake_up(&mddev->sb_wait); | |
409c57f3 N |
305 | } |
306 | ||
9e35b99c N |
307 | /* mddev_suspend makes sure no new requests are submitted |
308 | * to the device, and that any requests that have been submitted | |
309 | * are completely handled. | |
afa0f557 N |
310 | * Once mddev_detach() is called and completes, the module will be |
311 | * completely unused. | |
9e35b99c | 312 | */ |
fd01b88c | 313 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
314 | { |
315 | BUG_ON(mddev->suspended); | |
316 | mddev->suspended = 1; | |
317 | synchronize_rcu(); | |
318 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
319 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
320 | |
321 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 322 | } |
390ee602 | 323 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 324 | |
fd01b88c | 325 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
326 | { |
327 | mddev->suspended = 0; | |
328 | wake_up(&mddev->sb_wait); | |
329 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 330 | |
47525e59 | 331 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
332 | md_wakeup_thread(mddev->thread); |
333 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 334 | } |
390ee602 | 335 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 336 | |
fd01b88c | 337 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 | 338 | { |
5c675f83 N |
339 | struct md_personality *pers = mddev->pers; |
340 | int ret = 0; | |
341 | ||
342 | rcu_read_lock(); | |
343 | if (mddev->suspended) | |
344 | ret = 1; | |
345 | else if (pers && pers->congested) | |
346 | ret = pers->congested(mddev, bits); | |
347 | rcu_read_unlock(); | |
348 | return ret; | |
349 | } | |
350 | EXPORT_SYMBOL_GPL(mddev_congested); | |
351 | static int md_congested(void *data, int bits) | |
352 | { | |
353 | struct mddev *mddev = data; | |
354 | return mddev_congested(mddev, bits); | |
3fa841d7 | 355 | } |
3fa841d7 | 356 | |
a2826aa9 | 357 | /* |
e9c7469b | 358 | * Generic flush handling for md |
a2826aa9 N |
359 | */ |
360 | ||
4246a0b6 | 361 | static void md_end_flush(struct bio *bio) |
a2826aa9 | 362 | { |
3cb03002 | 363 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 364 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
365 | |
366 | rdev_dec_pending(rdev, mddev); | |
367 | ||
368 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 369 | /* The pre-request flush has finished */ |
e804ac78 | 370 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
371 | } |
372 | bio_put(bio); | |
373 | } | |
374 | ||
a7a07e69 N |
375 | static void md_submit_flush_data(struct work_struct *ws); |
376 | ||
a035fc3e | 377 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 378 | { |
fd01b88c | 379 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 380 | struct md_rdev *rdev; |
a2826aa9 | 381 | |
a7a07e69 N |
382 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
383 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 384 | rcu_read_lock(); |
dafb20fa | 385 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
386 | if (rdev->raid_disk >= 0 && |
387 | !test_bit(Faulty, &rdev->flags)) { | |
388 | /* Take two references, one is dropped | |
389 | * when request finishes, one after | |
390 | * we reclaim rcu_read_lock | |
391 | */ | |
392 | struct bio *bi; | |
393 | atomic_inc(&rdev->nr_pending); | |
394 | atomic_inc(&rdev->nr_pending); | |
395 | rcu_read_unlock(); | |
b5e1b8ce | 396 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 397 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
398 | bi->bi_private = rdev; |
399 | bi->bi_bdev = rdev->bdev; | |
400 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 401 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
402 | rcu_read_lock(); |
403 | rdev_dec_pending(rdev, mddev); | |
404 | } | |
405 | rcu_read_unlock(); | |
a7a07e69 N |
406 | if (atomic_dec_and_test(&mddev->flush_pending)) |
407 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
408 | } |
409 | ||
e9c7469b | 410 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 411 | { |
fd01b88c | 412 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 413 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 414 | |
4f024f37 | 415 | if (bio->bi_iter.bi_size == 0) |
a2826aa9 | 416 | /* an empty barrier - all done */ |
4246a0b6 | 417 | bio_endio(bio); |
a2826aa9 | 418 | else { |
e9c7469b | 419 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 420 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 421 | } |
2b74e12e N |
422 | |
423 | mddev->flush_bio = NULL; | |
424 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
425 | } |
426 | ||
fd01b88c | 427 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 | 428 | { |
85572d7c | 429 | spin_lock_irq(&mddev->lock); |
a2826aa9 | 430 | wait_event_lock_irq(mddev->sb_wait, |
e9c7469b | 431 | !mddev->flush_bio, |
85572d7c | 432 | mddev->lock); |
e9c7469b | 433 | mddev->flush_bio = bio; |
85572d7c | 434 | spin_unlock_irq(&mddev->lock); |
a2826aa9 | 435 | |
a035fc3e N |
436 | INIT_WORK(&mddev->flush_work, submit_flushes); |
437 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 438 | } |
e9c7469b | 439 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 440 | |
74018dc3 | 441 | void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
97658cdd | 442 | { |
9cbb1750 N |
443 | struct mddev *mddev = cb->data; |
444 | md_wakeup_thread(mddev->thread); | |
445 | kfree(cb); | |
97658cdd | 446 | } |
9cbb1750 | 447 | EXPORT_SYMBOL(md_unplug); |
2ac87401 | 448 | |
fd01b88c | 449 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
450 | { |
451 | atomic_inc(&mddev->active); | |
452 | return mddev; | |
453 | } | |
454 | ||
5fd3a17e | 455 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 456 | |
fd01b88c | 457 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 458 | { |
a167f663 N |
459 | struct bio_set *bs = NULL; |
460 | ||
1da177e4 LT |
461 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
462 | return; | |
d3374825 | 463 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
464 | mddev->ctime == 0 && !mddev->hold_active) { |
465 | /* Array is not configured at all, and not held active, | |
466 | * so destroy it */ | |
af8a2434 | 467 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
468 | bs = mddev->bio_set; |
469 | mddev->bio_set = NULL; | |
d3374825 | 470 | if (mddev->gendisk) { |
e804ac78 TH |
471 | /* We did a probe so need to clean up. Call |
472 | * queue_work inside the spinlock so that | |
473 | * flush_workqueue() after mddev_find will | |
474 | * succeed in waiting for the work to be done. | |
d3374825 N |
475 | */ |
476 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 477 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
478 | } else |
479 | kfree(mddev); | |
480 | } | |
481 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
482 | if (bs) |
483 | bioset_free(bs); | |
1da177e4 LT |
484 | } |
485 | ||
25b2edfa SL |
486 | static void md_safemode_timeout(unsigned long data); |
487 | ||
fd01b88c | 488 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
489 | { |
490 | mutex_init(&mddev->open_mutex); | |
491 | mutex_init(&mddev->reconfig_mutex); | |
492 | mutex_init(&mddev->bitmap_info.mutex); | |
493 | INIT_LIST_HEAD(&mddev->disks); | |
494 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
25b2edfa SL |
495 | setup_timer(&mddev->safemode_timer, md_safemode_timeout, |
496 | (unsigned long) mddev); | |
fafd7fb0 N |
497 | atomic_set(&mddev->active, 1); |
498 | atomic_set(&mddev->openers, 0); | |
499 | atomic_set(&mddev->active_io, 0); | |
85572d7c | 500 | spin_lock_init(&mddev->lock); |
fafd7fb0 N |
501 | atomic_set(&mddev->flush_pending, 0); |
502 | init_waitqueue_head(&mddev->sb_wait); | |
503 | init_waitqueue_head(&mddev->recovery_wait); | |
504 | mddev->reshape_position = MaxSector; | |
2c810cdd | 505 | mddev->reshape_backwards = 0; |
c4a39551 | 506 | mddev->last_sync_action = "none"; |
fafd7fb0 N |
507 | mddev->resync_min = 0; |
508 | mddev->resync_max = MaxSector; | |
509 | mddev->level = LEVEL_NONE; | |
510 | } | |
390ee602 | 511 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 512 | |
f72ffdd6 | 513 | static struct mddev *mddev_find(dev_t unit) |
1da177e4 | 514 | { |
fd01b88c | 515 | struct mddev *mddev, *new = NULL; |
1da177e4 | 516 | |
8f5f02c4 N |
517 | if (unit && MAJOR(unit) != MD_MAJOR) |
518 | unit &= ~((1<<MdpMinorShift)-1); | |
519 | ||
1da177e4 LT |
520 | retry: |
521 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
522 | |
523 | if (unit) { | |
524 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
525 | if (mddev->unit == unit) { | |
526 | mddev_get(mddev); | |
527 | spin_unlock(&all_mddevs_lock); | |
528 | kfree(new); | |
529 | return mddev; | |
530 | } | |
531 | ||
532 | if (new) { | |
533 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 534 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
535 | new->hold_active = UNTIL_IOCTL; |
536 | return new; | |
1da177e4 | 537 | } |
efeb53c0 N |
538 | } else if (new) { |
539 | /* find an unused unit number */ | |
540 | static int next_minor = 512; | |
541 | int start = next_minor; | |
542 | int is_free = 0; | |
543 | int dev = 0; | |
544 | while (!is_free) { | |
545 | dev = MKDEV(MD_MAJOR, next_minor); | |
546 | next_minor++; | |
547 | if (next_minor > MINORMASK) | |
548 | next_minor = 0; | |
549 | if (next_minor == start) { | |
550 | /* Oh dear, all in use. */ | |
551 | spin_unlock(&all_mddevs_lock); | |
552 | kfree(new); | |
553 | return NULL; | |
554 | } | |
f72ffdd6 | 555 | |
efeb53c0 N |
556 | is_free = 1; |
557 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
558 | if (mddev->unit == dev) { | |
559 | is_free = 0; | |
560 | break; | |
561 | } | |
562 | } | |
563 | new->unit = dev; | |
564 | new->md_minor = MINOR(dev); | |
565 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
566 | list_add(&new->all_mddevs, &all_mddevs); |
567 | spin_unlock(&all_mddevs_lock); | |
568 | return new; | |
569 | } | |
570 | spin_unlock(&all_mddevs_lock); | |
571 | ||
9ffae0cf | 572 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
573 | if (!new) |
574 | return NULL; | |
575 | ||
1da177e4 LT |
576 | new->unit = unit; |
577 | if (MAJOR(unit) == MD_MAJOR) | |
578 | new->md_minor = MINOR(unit); | |
579 | else | |
580 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
581 | ||
fafd7fb0 | 582 | mddev_init(new); |
1da177e4 | 583 | |
1da177e4 LT |
584 | goto retry; |
585 | } | |
586 | ||
b6eb127d N |
587 | static struct attribute_group md_redundancy_group; |
588 | ||
5c47daf6 | 589 | void mddev_unlock(struct mddev *mddev) |
1da177e4 | 590 | { |
a64c876f | 591 | if (mddev->to_remove) { |
b6eb127d N |
592 | /* These cannot be removed under reconfig_mutex as |
593 | * an access to the files will try to take reconfig_mutex | |
594 | * while holding the file unremovable, which leads to | |
595 | * a deadlock. | |
bb4f1e9d N |
596 | * So hold set sysfs_active while the remove in happeing, |
597 | * and anything else which might set ->to_remove or my | |
598 | * otherwise change the sysfs namespace will fail with | |
599 | * -EBUSY if sysfs_active is still set. | |
600 | * We set sysfs_active under reconfig_mutex and elsewhere | |
601 | * test it under the same mutex to ensure its correct value | |
602 | * is seen. | |
b6eb127d | 603 | */ |
a64c876f N |
604 | struct attribute_group *to_remove = mddev->to_remove; |
605 | mddev->to_remove = NULL; | |
bb4f1e9d | 606 | mddev->sysfs_active = 1; |
b6eb127d N |
607 | mutex_unlock(&mddev->reconfig_mutex); |
608 | ||
00bcb4ac N |
609 | if (mddev->kobj.sd) { |
610 | if (to_remove != &md_redundancy_group) | |
611 | sysfs_remove_group(&mddev->kobj, to_remove); | |
612 | if (mddev->pers == NULL || | |
613 | mddev->pers->sync_request == NULL) { | |
614 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
615 | if (mddev->sysfs_action) | |
616 | sysfs_put(mddev->sysfs_action); | |
617 | mddev->sysfs_action = NULL; | |
618 | } | |
a64c876f | 619 | } |
bb4f1e9d | 620 | mddev->sysfs_active = 0; |
b6eb127d N |
621 | } else |
622 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 623 | |
751e67ca CD |
624 | /* As we've dropped the mutex we need a spinlock to |
625 | * make sure the thread doesn't disappear | |
01f96c0a N |
626 | */ |
627 | spin_lock(&pers_lock); | |
005eca5e | 628 | md_wakeup_thread(mddev->thread); |
01f96c0a | 629 | spin_unlock(&pers_lock); |
1da177e4 | 630 | } |
5c47daf6 | 631 | EXPORT_SYMBOL_GPL(mddev_unlock); |
1da177e4 | 632 | |
57d051dc | 633 | struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr) |
1ca69c4b N |
634 | { |
635 | struct md_rdev *rdev; | |
636 | ||
637 | rdev_for_each_rcu(rdev, mddev) | |
638 | if (rdev->desc_nr == nr) | |
639 | return rdev; | |
640 | ||
641 | return NULL; | |
642 | } | |
57d051dc | 643 | EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu); |
1ca69c4b N |
644 | |
645 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 646 | { |
3cb03002 | 647 | struct md_rdev *rdev; |
1da177e4 | 648 | |
dafb20fa | 649 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
650 | if (rdev->bdev->bd_dev == dev) |
651 | return rdev; | |
159ec1fc | 652 | |
1da177e4 LT |
653 | return NULL; |
654 | } | |
655 | ||
1ca69c4b N |
656 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
657 | { | |
658 | struct md_rdev *rdev; | |
659 | ||
660 | rdev_for_each_rcu(rdev, mddev) | |
661 | if (rdev->bdev->bd_dev == dev) | |
662 | return rdev; | |
663 | ||
664 | return NULL; | |
665 | } | |
666 | ||
84fc4b56 | 667 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 668 | { |
84fc4b56 | 669 | struct md_personality *pers; |
d9d166c2 N |
670 | list_for_each_entry(pers, &pers_list, list) { |
671 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 672 | return pers; |
d9d166c2 N |
673 | if (strcmp(pers->name, clevel)==0) |
674 | return pers; | |
675 | } | |
2604b703 N |
676 | return NULL; |
677 | } | |
678 | ||
b73df2d3 | 679 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 680 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 681 | { |
57b2caa3 | 682 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 683 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
684 | } |
685 | ||
f72ffdd6 | 686 | static int alloc_disk_sb(struct md_rdev *rdev) |
1da177e4 | 687 | { |
1da177e4 LT |
688 | rdev->sb_page = alloc_page(GFP_KERNEL); |
689 | if (!rdev->sb_page) { | |
690 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 691 | return -ENOMEM; |
1da177e4 LT |
692 | } |
693 | ||
694 | return 0; | |
695 | } | |
696 | ||
545c8795 | 697 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
698 | { |
699 | if (rdev->sb_page) { | |
2d1f3b5d | 700 | put_page(rdev->sb_page); |
1da177e4 LT |
701 | rdev->sb_loaded = 0; |
702 | rdev->sb_page = NULL; | |
0f420358 | 703 | rdev->sb_start = 0; |
dd8ac336 | 704 | rdev->sectors = 0; |
1da177e4 | 705 | } |
2699b672 N |
706 | if (rdev->bb_page) { |
707 | put_page(rdev->bb_page); | |
708 | rdev->bb_page = NULL; | |
709 | } | |
4fa2f327 N |
710 | kfree(rdev->badblocks.page); |
711 | rdev->badblocks.page = NULL; | |
1da177e4 | 712 | } |
545c8795 | 713 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 714 | |
4246a0b6 | 715 | static void super_written(struct bio *bio) |
7bfa19f2 | 716 | { |
3cb03002 | 717 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 718 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 719 | |
4246a0b6 CH |
720 | if (bio->bi_error) { |
721 | printk("md: super_written gets error=%d\n", bio->bi_error); | |
a9701a30 | 722 | md_error(mddev, rdev); |
3a0f5bbb | 723 | } |
7bfa19f2 | 724 | |
a9701a30 N |
725 | if (atomic_dec_and_test(&mddev->pending_writes)) |
726 | wake_up(&mddev->sb_wait); | |
f8b58edf | 727 | bio_put(bio); |
7bfa19f2 N |
728 | } |
729 | ||
fd01b88c | 730 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
731 | sector_t sector, int size, struct page *page) |
732 | { | |
733 | /* write first size bytes of page to sector of rdev | |
734 | * Increment mddev->pending_writes before returning | |
735 | * and decrement it on completion, waking up sb_wait | |
736 | * if zero is reached. | |
737 | * If an error occurred, call md_error | |
738 | */ | |
a167f663 | 739 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 740 | |
a6ff7e08 | 741 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
4f024f37 | 742 | bio->bi_iter.bi_sector = sector; |
7bfa19f2 N |
743 | bio_add_page(bio, page, size, 0); |
744 | bio->bi_private = rdev; | |
745 | bio->bi_end_io = super_written; | |
a9701a30 | 746 | |
7bfa19f2 | 747 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 748 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
749 | } |
750 | ||
fd01b88c | 751 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 752 | { |
e9c7469b | 753 | /* wait for all superblock writes that were scheduled to complete */ |
1967cd56 | 754 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
7bfa19f2 N |
755 | } |
756 | ||
3cb03002 | 757 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 758 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 759 | { |
a167f663 | 760 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
761 | int ret; |
762 | ||
a6ff7e08 JB |
763 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
764 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 | 765 | if (metadata_op) |
4f024f37 | 766 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
1fdd6fc9 N |
767 | else if (rdev->mddev->reshape_position != MaxSector && |
768 | (rdev->mddev->reshape_backwards == | |
769 | (sector >= rdev->mddev->reshape_position))) | |
4f024f37 | 770 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
ccebd4c4 | 771 | else |
4f024f37 | 772 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
1da177e4 | 773 | bio_add_page(bio, page, size, 0); |
c170bbb4 | 774 | submit_bio_wait(rw, bio); |
1da177e4 | 775 | |
4246a0b6 | 776 | ret = !bio->bi_error; |
1da177e4 LT |
777 | bio_put(bio); |
778 | return ret; | |
779 | } | |
a8745db2 | 780 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 781 | |
f72ffdd6 | 782 | static int read_disk_sb(struct md_rdev *rdev, int size) |
1da177e4 LT |
783 | { |
784 | char b[BDEVNAME_SIZE]; | |
403df478 | 785 | |
1da177e4 LT |
786 | if (rdev->sb_loaded) |
787 | return 0; | |
788 | ||
ccebd4c4 | 789 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
790 | goto fail; |
791 | rdev->sb_loaded = 1; | |
792 | return 0; | |
793 | ||
794 | fail: | |
795 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
796 | bdevname(rdev->bdev,b)); | |
797 | return -EINVAL; | |
798 | } | |
799 | ||
800 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
801 | { | |
f72ffdd6 | 802 | return sb1->set_uuid0 == sb2->set_uuid0 && |
05710466 AN |
803 | sb1->set_uuid1 == sb2->set_uuid1 && |
804 | sb1->set_uuid2 == sb2->set_uuid2 && | |
805 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
806 | } |
807 | ||
1da177e4 LT |
808 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
809 | { | |
810 | int ret; | |
811 | mdp_super_t *tmp1, *tmp2; | |
812 | ||
813 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
814 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
815 | ||
816 | if (!tmp1 || !tmp2) { | |
817 | ret = 0; | |
35020f1a | 818 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
819 | goto abort; |
820 | } | |
821 | ||
822 | *tmp1 = *sb1; | |
823 | *tmp2 = *sb2; | |
824 | ||
825 | /* | |
826 | * nr_disks is not constant | |
827 | */ | |
828 | tmp1->nr_disks = 0; | |
829 | tmp2->nr_disks = 0; | |
830 | ||
ce0c8e05 | 831 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 832 | abort: |
990a8baf JJ |
833 | kfree(tmp1); |
834 | kfree(tmp2); | |
1da177e4 LT |
835 | return ret; |
836 | } | |
837 | ||
4d167f09 N |
838 | static u32 md_csum_fold(u32 csum) |
839 | { | |
840 | csum = (csum & 0xffff) + (csum >> 16); | |
841 | return (csum & 0xffff) + (csum >> 16); | |
842 | } | |
843 | ||
f72ffdd6 | 844 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
1da177e4 | 845 | { |
4d167f09 N |
846 | u64 newcsum = 0; |
847 | u32 *sb32 = (u32*)sb; | |
848 | int i; | |
1da177e4 LT |
849 | unsigned int disk_csum, csum; |
850 | ||
851 | disk_csum = sb->sb_csum; | |
852 | sb->sb_csum = 0; | |
4d167f09 N |
853 | |
854 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
855 | newcsum += sb32[i]; | |
856 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
857 | ||
4d167f09 N |
858 | #ifdef CONFIG_ALPHA |
859 | /* This used to use csum_partial, which was wrong for several | |
860 | * reasons including that different results are returned on | |
861 | * different architectures. It isn't critical that we get exactly | |
862 | * the same return value as before (we always csum_fold before | |
863 | * testing, and that removes any differences). However as we | |
864 | * know that csum_partial always returned a 16bit value on | |
865 | * alphas, do a fold to maximise conformity to previous behaviour. | |
866 | */ | |
867 | sb->sb_csum = md_csum_fold(disk_csum); | |
868 | #else | |
1da177e4 | 869 | sb->sb_csum = disk_csum; |
4d167f09 | 870 | #endif |
1da177e4 LT |
871 | return csum; |
872 | } | |
873 | ||
1da177e4 LT |
874 | /* |
875 | * Handle superblock details. | |
876 | * We want to be able to handle multiple superblock formats | |
877 | * so we have a common interface to them all, and an array of | |
878 | * different handlers. | |
879 | * We rely on user-space to write the initial superblock, and support | |
880 | * reading and updating of superblocks. | |
881 | * Interface methods are: | |
3cb03002 | 882 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
883 | * loads and validates a superblock on dev. |
884 | * if refdev != NULL, compare superblocks on both devices | |
885 | * Return: | |
886 | * 0 - dev has a superblock that is compatible with refdev | |
887 | * 1 - dev has a superblock that is compatible and newer than refdev | |
888 | * so dev should be used as the refdev in future | |
889 | * -EINVAL superblock incompatible or invalid | |
890 | * -othererror e.g. -EIO | |
891 | * | |
fd01b88c | 892 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
893 | * Verify that dev is acceptable into mddev. |
894 | * The first time, mddev->raid_disks will be 0, and data from | |
895 | * dev should be merged in. Subsequent calls check that dev | |
896 | * is new enough. Return 0 or -EINVAL | |
897 | * | |
fd01b88c | 898 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
899 | * Update the superblock for rdev with data in mddev |
900 | * This does not write to disc. | |
901 | * | |
902 | */ | |
903 | ||
904 | struct super_type { | |
0cd17fec CW |
905 | char *name; |
906 | struct module *owner; | |
c6563a8c N |
907 | int (*load_super)(struct md_rdev *rdev, |
908 | struct md_rdev *refdev, | |
0cd17fec | 909 | int minor_version); |
c6563a8c N |
910 | int (*validate_super)(struct mddev *mddev, |
911 | struct md_rdev *rdev); | |
912 | void (*sync_super)(struct mddev *mddev, | |
913 | struct md_rdev *rdev); | |
3cb03002 | 914 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 915 | sector_t num_sectors); |
c6563a8c N |
916 | int (*allow_new_offset)(struct md_rdev *rdev, |
917 | unsigned long long new_offset); | |
1da177e4 LT |
918 | }; |
919 | ||
0894cc30 AN |
920 | /* |
921 | * Check that the given mddev has no bitmap. | |
922 | * | |
923 | * This function is called from the run method of all personalities that do not | |
924 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
925 | * has a bitmap. Otherwise, it returns 0. | |
926 | * | |
927 | */ | |
fd01b88c | 928 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 929 | { |
c3d9714e | 930 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
931 | return 0; |
932 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
933 | mdname(mddev), mddev->pers->name); | |
934 | return 1; | |
935 | } | |
936 | EXPORT_SYMBOL(md_check_no_bitmap); | |
937 | ||
1da177e4 | 938 | /* |
f72ffdd6 | 939 | * load_super for 0.90.0 |
1da177e4 | 940 | */ |
3cb03002 | 941 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
942 | { |
943 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
944 | mdp_super_t *sb; | |
945 | int ret; | |
1da177e4 LT |
946 | |
947 | /* | |
0f420358 | 948 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
949 | * it's at the end of the disk. |
950 | * | |
951 | * It also happens to be a multiple of 4Kb. | |
952 | */ | |
57b2caa3 | 953 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 954 | |
0002b271 | 955 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
956 | if (ret) return ret; |
957 | ||
958 | ret = -EINVAL; | |
959 | ||
960 | bdevname(rdev->bdev, b); | |
65a06f06 | 961 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
962 | |
963 | if (sb->md_magic != MD_SB_MAGIC) { | |
964 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
965 | b); | |
966 | goto abort; | |
967 | } | |
968 | ||
969 | if (sb->major_version != 0 || | |
f6705578 N |
970 | sb->minor_version < 90 || |
971 | sb->minor_version > 91) { | |
1da177e4 LT |
972 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
973 | sb->major_version, sb->minor_version, | |
974 | b); | |
975 | goto abort; | |
976 | } | |
977 | ||
978 | if (sb->raid_disks <= 0) | |
979 | goto abort; | |
980 | ||
4d167f09 | 981 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
982 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
983 | b); | |
984 | goto abort; | |
985 | } | |
986 | ||
987 | rdev->preferred_minor = sb->md_minor; | |
988 | rdev->data_offset = 0; | |
c6563a8c | 989 | rdev->new_data_offset = 0; |
0002b271 | 990 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 991 | rdev->badblocks.shift = -1; |
1da177e4 LT |
992 | |
993 | if (sb->level == LEVEL_MULTIPATH) | |
994 | rdev->desc_nr = -1; | |
995 | else | |
996 | rdev->desc_nr = sb->this_disk.number; | |
997 | ||
9a7b2b0f | 998 | if (!refdev) { |
1da177e4 | 999 | ret = 1; |
9a7b2b0f | 1000 | } else { |
1da177e4 | 1001 | __u64 ev1, ev2; |
65a06f06 | 1002 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1003 | if (!uuid_equal(refsb, sb)) { |
1004 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1005 | b, bdevname(refdev->bdev,b2)); | |
1006 | goto abort; | |
1007 | } | |
1008 | if (!sb_equal(refsb, sb)) { | |
1009 | printk(KERN_WARNING "md: %s has same UUID" | |
1010 | " but different superblock to %s\n", | |
1011 | b, bdevname(refdev->bdev, b2)); | |
1012 | goto abort; | |
1013 | } | |
1014 | ev1 = md_event(sb); | |
1015 | ev2 = md_event(refsb); | |
1016 | if (ev1 > ev2) | |
1017 | ret = 1; | |
f72ffdd6 | 1018 | else |
1da177e4 LT |
1019 | ret = 0; |
1020 | } | |
8190e754 | 1021 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1022 | /* Limit to 4TB as metadata cannot record more than that. |
1023 | * (not needed for Linear and RAID0 as metadata doesn't | |
1024 | * record this size) | |
1025 | */ | |
1026 | if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) | |
27a7b260 | 1027 | rdev->sectors = (2ULL << 32) - 2; |
1da177e4 | 1028 | |
27a7b260 | 1029 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1030 | /* "this cannot possibly happen" ... */ |
1031 | ret = -EINVAL; | |
1032 | ||
1da177e4 LT |
1033 | abort: |
1034 | return ret; | |
1035 | } | |
1036 | ||
1037 | /* | |
1038 | * validate_super for 0.90.0 | |
1039 | */ | |
fd01b88c | 1040 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1041 | { |
1042 | mdp_disk_t *desc; | |
65a06f06 | 1043 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1044 | __u64 ev1 = md_event(sb); |
1da177e4 | 1045 | |
41158c7e | 1046 | rdev->raid_disk = -1; |
c5d79adb N |
1047 | clear_bit(Faulty, &rdev->flags); |
1048 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1049 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1050 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1051 | |
1da177e4 LT |
1052 | if (mddev->raid_disks == 0) { |
1053 | mddev->major_version = 0; | |
1054 | mddev->minor_version = sb->minor_version; | |
1055 | mddev->patch_version = sb->patch_version; | |
e691063a | 1056 | mddev->external = 0; |
9d8f0363 | 1057 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1058 | mddev->ctime = sb->ctime; |
1059 | mddev->utime = sb->utime; | |
1060 | mddev->level = sb->level; | |
d9d166c2 | 1061 | mddev->clevel[0] = 0; |
1da177e4 LT |
1062 | mddev->layout = sb->layout; |
1063 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1064 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1065 | mddev->events = ev1; |
c3d9714e | 1066 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1067 | mddev->bitmap_info.space = 0; |
1068 | /* bitmap can use 60 K after the 4K superblocks */ | |
c3d9714e | 1069 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 1070 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
2c810cdd | 1071 | mddev->reshape_backwards = 0; |
1da177e4 | 1072 | |
f6705578 N |
1073 | if (mddev->minor_version >= 91) { |
1074 | mddev->reshape_position = sb->reshape_position; | |
1075 | mddev->delta_disks = sb->delta_disks; | |
1076 | mddev->new_level = sb->new_level; | |
1077 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1078 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1079 | if (mddev->delta_disks < 0) |
1080 | mddev->reshape_backwards = 1; | |
f6705578 N |
1081 | } else { |
1082 | mddev->reshape_position = MaxSector; | |
1083 | mddev->delta_disks = 0; | |
1084 | mddev->new_level = mddev->level; | |
1085 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1086 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1087 | } |
1088 | ||
1da177e4 LT |
1089 | if (sb->state & (1<<MD_SB_CLEAN)) |
1090 | mddev->recovery_cp = MaxSector; | |
1091 | else { | |
f72ffdd6 | 1092 | if (sb->events_hi == sb->cp_events_hi && |
1da177e4 LT |
1093 | sb->events_lo == sb->cp_events_lo) { |
1094 | mddev->recovery_cp = sb->recovery_cp; | |
1095 | } else | |
1096 | mddev->recovery_cp = 0; | |
1097 | } | |
1098 | ||
1099 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1100 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1101 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1102 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1103 | ||
1104 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1105 | |
1106 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
6409bb05 | 1107 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1108 | mddev->bitmap_info.offset = |
1109 | mddev->bitmap_info.default_offset; | |
6409bb05 | 1110 | mddev->bitmap_info.space = |
c9ad020f | 1111 | mddev->bitmap_info.default_space; |
6409bb05 | 1112 | } |
a654b9d8 | 1113 | |
41158c7e | 1114 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1115 | /* Insist on good event counter while assembling, except |
1116 | * for spares (which don't need an event count) */ | |
1da177e4 | 1117 | ++ev1; |
be6800a7 N |
1118 | if (sb->disks[rdev->desc_nr].state & ( |
1119 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
f72ffdd6 | 1120 | if (ev1 < mddev->events) |
be6800a7 | 1121 | return -EINVAL; |
41158c7e N |
1122 | } else if (mddev->bitmap) { |
1123 | /* if adding to array with a bitmap, then we can accept an | |
1124 | * older device ... but not too old. | |
1125 | */ | |
41158c7e N |
1126 | if (ev1 < mddev->bitmap->events_cleared) |
1127 | return 0; | |
8313b8e5 N |
1128 | if (ev1 < mddev->events) |
1129 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1130 | } else { |
1131 | if (ev1 < mddev->events) | |
1132 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1133 | return 0; | |
1134 | } | |
41158c7e | 1135 | |
1da177e4 | 1136 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1137 | desc = sb->disks + rdev->desc_nr; |
1138 | ||
1139 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1140 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1141 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1142 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1143 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1144 | rdev->raid_disk = desc->raid_disk; |
f466722c | 1145 | rdev->saved_raid_disk = desc->raid_disk; |
0261cd9f N |
1146 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1147 | /* active but not in sync implies recovery up to | |
1148 | * reshape position. We don't know exactly where | |
1149 | * that is, so set to zero for now */ | |
1150 | if (mddev->minor_version >= 91) { | |
1151 | rdev->recovery_offset = 0; | |
1152 | rdev->raid_disk = desc->raid_disk; | |
1153 | } | |
1da177e4 | 1154 | } |
8ddf9efe N |
1155 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1156 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1157 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1158 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1159 | return 0; |
1160 | } | |
1161 | ||
1162 | /* | |
1163 | * sync_super for 0.90.0 | |
1164 | */ | |
fd01b88c | 1165 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1166 | { |
1167 | mdp_super_t *sb; | |
3cb03002 | 1168 | struct md_rdev *rdev2; |
1da177e4 | 1169 | int next_spare = mddev->raid_disks; |
19133a42 | 1170 | |
1da177e4 LT |
1171 | /* make rdev->sb match mddev data.. |
1172 | * | |
1173 | * 1/ zero out disks | |
1174 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1175 | * 3/ any empty disks < next_spare become removed | |
1176 | * | |
1177 | * disks[0] gets initialised to REMOVED because | |
1178 | * we cannot be sure from other fields if it has | |
1179 | * been initialised or not. | |
1180 | */ | |
1181 | int i; | |
1182 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1183 | ||
61181565 N |
1184 | rdev->sb_size = MD_SB_BYTES; |
1185 | ||
65a06f06 | 1186 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1187 | |
1188 | memset(sb, 0, sizeof(*sb)); | |
1189 | ||
1190 | sb->md_magic = MD_SB_MAGIC; | |
1191 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1192 | sb->patch_version = mddev->patch_version; |
1193 | sb->gvalid_words = 0; /* ignored */ | |
1194 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1195 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1196 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1197 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1198 | ||
1199 | sb->ctime = mddev->ctime; | |
1200 | sb->level = mddev->level; | |
58c0fed4 | 1201 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1202 | sb->raid_disks = mddev->raid_disks; |
1203 | sb->md_minor = mddev->md_minor; | |
e691063a | 1204 | sb->not_persistent = 0; |
1da177e4 LT |
1205 | sb->utime = mddev->utime; |
1206 | sb->state = 0; | |
1207 | sb->events_hi = (mddev->events>>32); | |
1208 | sb->events_lo = (u32)mddev->events; | |
1209 | ||
f6705578 N |
1210 | if (mddev->reshape_position == MaxSector) |
1211 | sb->minor_version = 90; | |
1212 | else { | |
1213 | sb->minor_version = 91; | |
1214 | sb->reshape_position = mddev->reshape_position; | |
1215 | sb->new_level = mddev->new_level; | |
1216 | sb->delta_disks = mddev->delta_disks; | |
1217 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1218 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1219 | } |
1220 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1221 | if (mddev->in_sync) |
1222 | { | |
1223 | sb->recovery_cp = mddev->recovery_cp; | |
1224 | sb->cp_events_hi = (mddev->events>>32); | |
1225 | sb->cp_events_lo = (u32)mddev->events; | |
1226 | if (mddev->recovery_cp == MaxSector) | |
1227 | sb->state = (1<< MD_SB_CLEAN); | |
1228 | } else | |
1229 | sb->recovery_cp = 0; | |
1230 | ||
1231 | sb->layout = mddev->layout; | |
9d8f0363 | 1232 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1233 | |
c3d9714e | 1234 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1235 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1236 | ||
1da177e4 | 1237 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1238 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1239 | mdp_disk_t *d; |
86e6ffdd | 1240 | int desc_nr; |
0261cd9f N |
1241 | int is_active = test_bit(In_sync, &rdev2->flags); |
1242 | ||
1243 | if (rdev2->raid_disk >= 0 && | |
1244 | sb->minor_version >= 91) | |
1245 | /* we have nowhere to store the recovery_offset, | |
1246 | * but if it is not below the reshape_position, | |
1247 | * we can piggy-back on that. | |
1248 | */ | |
1249 | is_active = 1; | |
1250 | if (rdev2->raid_disk < 0 || | |
1251 | test_bit(Faulty, &rdev2->flags)) | |
1252 | is_active = 0; | |
1253 | if (is_active) | |
86e6ffdd | 1254 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1255 | else |
86e6ffdd | 1256 | desc_nr = next_spare++; |
19133a42 | 1257 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1258 | d = &sb->disks[rdev2->desc_nr]; |
1259 | nr_disks++; | |
1260 | d->number = rdev2->desc_nr; | |
1261 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1262 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1263 | if (is_active) |
1da177e4 LT |
1264 | d->raid_disk = rdev2->raid_disk; |
1265 | else | |
1266 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1267 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1268 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1269 | else if (is_active) { |
1da177e4 | 1270 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1271 | if (test_bit(In_sync, &rdev2->flags)) |
1272 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1273 | active++; |
1274 | working++; | |
1275 | } else { | |
1276 | d->state = 0; | |
1277 | spare++; | |
1278 | working++; | |
1279 | } | |
8ddf9efe N |
1280 | if (test_bit(WriteMostly, &rdev2->flags)) |
1281 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1282 | } |
1da177e4 LT |
1283 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1284 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1285 | mdp_disk_t *d = &sb->disks[i]; | |
1286 | if (d->state == 0 && d->number == 0) { | |
1287 | d->number = i; | |
1288 | d->raid_disk = i; | |
1289 | d->state = (1<<MD_DISK_REMOVED); | |
1290 | d->state |= (1<<MD_DISK_FAULTY); | |
1291 | failed++; | |
1292 | } | |
1293 | } | |
1294 | sb->nr_disks = nr_disks; | |
1295 | sb->active_disks = active; | |
1296 | sb->working_disks = working; | |
1297 | sb->failed_disks = failed; | |
1298 | sb->spare_disks = spare; | |
1299 | ||
1300 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1301 | sb->sb_csum = calc_sb_csum(sb); | |
1302 | } | |
1303 | ||
0cd17fec CW |
1304 | /* |
1305 | * rdev_size_change for 0.90.0 | |
1306 | */ | |
1307 | static unsigned long long | |
3cb03002 | 1308 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1309 | { |
58c0fed4 | 1310 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1311 | return 0; /* component must fit device */ |
c3d9714e | 1312 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1313 | return 0; /* can't move bitmap */ |
57b2caa3 | 1314 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1315 | if (!num_sectors || num_sectors > rdev->sb_start) |
1316 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1317 | /* Limit to 4TB as metadata cannot record more than that. |
1318 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1319 | */ | |
667a5313 | 1320 | if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) |
27a7b260 | 1321 | num_sectors = (2ULL << 32) - 2; |
0f420358 | 1322 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1323 | rdev->sb_page); |
1324 | md_super_wait(rdev->mddev); | |
c26a44ed | 1325 | return num_sectors; |
0cd17fec CW |
1326 | } |
1327 | ||
c6563a8c N |
1328 | static int |
1329 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1330 | { | |
1331 | /* non-zero offset changes not possible with v0.90 */ | |
1332 | return new_offset == 0; | |
1333 | } | |
0cd17fec | 1334 | |
1da177e4 LT |
1335 | /* |
1336 | * version 1 superblock | |
1337 | */ | |
1338 | ||
f72ffdd6 | 1339 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
1da177e4 | 1340 | { |
1c05b4bc N |
1341 | __le32 disk_csum; |
1342 | u32 csum; | |
1da177e4 LT |
1343 | unsigned long long newcsum; |
1344 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1345 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1346 | |
1347 | disk_csum = sb->sb_csum; | |
1348 | sb->sb_csum = 0; | |
1349 | newcsum = 0; | |
1f3c9907 | 1350 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1351 | newcsum += le32_to_cpu(*isuper++); |
1352 | ||
1353 | if (size == 2) | |
1c05b4bc | 1354 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1355 | |
1356 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1357 | sb->sb_csum = disk_csum; | |
1358 | return cpu_to_le32(csum); | |
1359 | } | |
1360 | ||
2699b672 N |
1361 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1362 | int acknowledged); | |
3cb03002 | 1363 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1364 | { |
1365 | struct mdp_superblock_1 *sb; | |
1366 | int ret; | |
0f420358 | 1367 | sector_t sb_start; |
c6563a8c | 1368 | sector_t sectors; |
1da177e4 | 1369 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1370 | int bmask; |
1da177e4 LT |
1371 | |
1372 | /* | |
0f420358 | 1373 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1374 | * It is always aligned to a 4K boundary and |
1375 | * depeding on minor_version, it can be: | |
1376 | * 0: At least 8K, but less than 12K, from end of device | |
1377 | * 1: At start of device | |
1378 | * 2: 4K from start of device. | |
1379 | */ | |
1380 | switch(minor_version) { | |
1381 | case 0: | |
77304d2a | 1382 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1383 | sb_start -= 8*2; |
1384 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1385 | break; |
1386 | case 1: | |
0f420358 | 1387 | sb_start = 0; |
1da177e4 LT |
1388 | break; |
1389 | case 2: | |
0f420358 | 1390 | sb_start = 8; |
1da177e4 LT |
1391 | break; |
1392 | default: | |
1393 | return -EINVAL; | |
1394 | } | |
0f420358 | 1395 | rdev->sb_start = sb_start; |
1da177e4 | 1396 | |
0002b271 N |
1397 | /* superblock is rarely larger than 1K, but it can be larger, |
1398 | * and it is safe to read 4k, so we do that | |
1399 | */ | |
1400 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1401 | if (ret) return ret; |
1402 | ||
65a06f06 | 1403 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1404 | |
1405 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1406 | sb->major_version != cpu_to_le32(1) || | |
1407 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1408 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1409 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1410 | return -EINVAL; |
1411 | ||
1412 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1413 | printk("md: invalid superblock checksum on %s\n", | |
1414 | bdevname(rdev->bdev,b)); | |
1415 | return -EINVAL; | |
1416 | } | |
1417 | if (le64_to_cpu(sb->data_size) < 10) { | |
1418 | printk("md: data_size too small on %s\n", | |
1419 | bdevname(rdev->bdev,b)); | |
1420 | return -EINVAL; | |
1421 | } | |
c6563a8c N |
1422 | if (sb->pad0 || |
1423 | sb->pad3[0] || | |
1424 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1425 | /* Some padding is non-zero, might be a new feature */ | |
1426 | return -EINVAL; | |
e11e93fa | 1427 | |
1da177e4 LT |
1428 | rdev->preferred_minor = 0xffff; |
1429 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1430 | rdev->new_data_offset = rdev->data_offset; |
1431 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1432 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1433 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1434 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1435 | |
0002b271 | 1436 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1437 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1438 | if (rdev->sb_size & bmask) |
a1801f85 N |
1439 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1440 | ||
1441 | if (minor_version | |
0f420358 | 1442 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1443 | return -EINVAL; |
c6563a8c N |
1444 | if (minor_version |
1445 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1446 | return -EINVAL; | |
0002b271 | 1447 | |
31b65a0d N |
1448 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1449 | rdev->desc_nr = -1; | |
1450 | else | |
1451 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1452 | ||
2699b672 N |
1453 | if (!rdev->bb_page) { |
1454 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1455 | if (!rdev->bb_page) | |
1456 | return -ENOMEM; | |
1457 | } | |
1458 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1459 | rdev->badblocks.count == 0) { | |
1460 | /* need to load the bad block list. | |
1461 | * Currently we limit it to one page. | |
1462 | */ | |
1463 | s32 offset; | |
1464 | sector_t bb_sector; | |
1465 | u64 *bbp; | |
1466 | int i; | |
1467 | int sectors = le16_to_cpu(sb->bblog_size); | |
1468 | if (sectors > (PAGE_SIZE / 512)) | |
1469 | return -EINVAL; | |
1470 | offset = le32_to_cpu(sb->bblog_offset); | |
1471 | if (offset == 0) | |
1472 | return -EINVAL; | |
1473 | bb_sector = (long long)offset; | |
1474 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1475 | rdev->bb_page, READ, true)) | |
1476 | return -EIO; | |
1477 | bbp = (u64 *)page_address(rdev->bb_page); | |
1478 | rdev->badblocks.shift = sb->bblog_shift; | |
1479 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1480 | u64 bb = le64_to_cpu(*bbp); | |
1481 | int count = bb & (0x3ff); | |
1482 | u64 sector = bb >> 10; | |
1483 | sector <<= sb->bblog_shift; | |
1484 | count <<= sb->bblog_shift; | |
1485 | if (bb + 1 == 0) | |
1486 | break; | |
1487 | if (md_set_badblocks(&rdev->badblocks, | |
1488 | sector, count, 1) == 0) | |
1489 | return -EINVAL; | |
1490 | } | |
486adf72 N |
1491 | } else if (sb->bblog_offset != 0) |
1492 | rdev->badblocks.shift = 0; | |
2699b672 | 1493 | |
9a7b2b0f | 1494 | if (!refdev) { |
8ed75463 | 1495 | ret = 1; |
9a7b2b0f | 1496 | } else { |
1da177e4 | 1497 | __u64 ev1, ev2; |
65a06f06 | 1498 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1499 | |
1500 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1501 | sb->level != refsb->level || | |
1502 | sb->layout != refsb->layout || | |
1503 | sb->chunksize != refsb->chunksize) { | |
1504 | printk(KERN_WARNING "md: %s has strangely different" | |
1505 | " superblock to %s\n", | |
1506 | bdevname(rdev->bdev,b), | |
1507 | bdevname(refdev->bdev,b2)); | |
1508 | return -EINVAL; | |
1509 | } | |
1510 | ev1 = le64_to_cpu(sb->events); | |
1511 | ev2 = le64_to_cpu(refsb->events); | |
1512 | ||
1513 | if (ev1 > ev2) | |
8ed75463 N |
1514 | ret = 1; |
1515 | else | |
1516 | ret = 0; | |
1da177e4 | 1517 | } |
c6563a8c N |
1518 | if (minor_version) { |
1519 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1520 | sectors -= rdev->data_offset; | |
1521 | } else | |
1522 | sectors = rdev->sb_start; | |
1523 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1524 | return -EINVAL; |
dd8ac336 | 1525 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1526 | return ret; |
1da177e4 LT |
1527 | } |
1528 | ||
fd01b88c | 1529 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1530 | { |
65a06f06 | 1531 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1532 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1533 | |
41158c7e | 1534 | rdev->raid_disk = -1; |
c5d79adb N |
1535 | clear_bit(Faulty, &rdev->flags); |
1536 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1537 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1538 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1539 | |
1da177e4 LT |
1540 | if (mddev->raid_disks == 0) { |
1541 | mddev->major_version = 1; | |
1542 | mddev->patch_version = 0; | |
e691063a | 1543 | mddev->external = 0; |
9d8f0363 | 1544 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1545 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1546 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1547 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1548 | mddev->clevel[0] = 0; |
1da177e4 LT |
1549 | mddev->layout = le32_to_cpu(sb->layout); |
1550 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1551 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1552 | mddev->events = ev1; |
c3d9714e | 1553 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1554 | mddev->bitmap_info.space = 0; |
1555 | /* Default location for bitmap is 1K after superblock | |
1556 | * using 3K - total of 4K | |
1557 | */ | |
c3d9714e | 1558 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1559 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1560 | mddev->reshape_backwards = 0; |
1561 | ||
1da177e4 LT |
1562 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1563 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1564 | ||
1565 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1566 | |
71c0805c | 1567 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1568 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1569 | mddev->bitmap_info.offset = |
1570 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1571 | /* Metadata doesn't record how much space is available. |
1572 | * For 1.0, we assume we can use up to the superblock | |
1573 | * if before, else to 4K beyond superblock. | |
1574 | * For others, assume no change is possible. | |
1575 | */ | |
1576 | if (mddev->minor_version > 0) | |
1577 | mddev->bitmap_info.space = 0; | |
1578 | else if (mddev->bitmap_info.offset > 0) | |
1579 | mddev->bitmap_info.space = | |
1580 | 8 - mddev->bitmap_info.offset; | |
1581 | else | |
1582 | mddev->bitmap_info.space = | |
1583 | -mddev->bitmap_info.offset; | |
1584 | } | |
e11e93fa | 1585 | |
f6705578 N |
1586 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1587 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1588 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1589 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1590 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1591 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1592 | if (mddev->delta_disks < 0 || |
1593 | (mddev->delta_disks == 0 && | |
1594 | (le32_to_cpu(sb->feature_map) | |
1595 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1596 | mddev->reshape_backwards = 1; | |
f6705578 N |
1597 | } else { |
1598 | mddev->reshape_position = MaxSector; | |
1599 | mddev->delta_disks = 0; | |
1600 | mddev->new_level = mddev->level; | |
1601 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1602 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1603 | } |
1604 | ||
41158c7e | 1605 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1606 | /* Insist of good event counter while assembling, except for |
1607 | * spares (which don't need an event count) */ | |
1da177e4 | 1608 | ++ev1; |
be6800a7 N |
1609 | if (rdev->desc_nr >= 0 && |
1610 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1611 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1612 | if (ev1 < mddev->events) | |
1613 | return -EINVAL; | |
41158c7e N |
1614 | } else if (mddev->bitmap) { |
1615 | /* If adding to array with a bitmap, then we can accept an | |
1616 | * older device, but not too old. | |
1617 | */ | |
41158c7e N |
1618 | if (ev1 < mddev->bitmap->events_cleared) |
1619 | return 0; | |
8313b8e5 N |
1620 | if (ev1 < mddev->events) |
1621 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1622 | } else { |
1623 | if (ev1 < mddev->events) | |
1624 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1625 | return 0; | |
1626 | } | |
1da177e4 LT |
1627 | if (mddev->level != LEVEL_MULTIPATH) { |
1628 | int role; | |
3673f305 N |
1629 | if (rdev->desc_nr < 0 || |
1630 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1631 | role = 0xffff; | |
1632 | rdev->desc_nr = -1; | |
1633 | } else | |
1634 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1635 | switch(role) { |
1636 | case 0xffff: /* spare */ | |
1da177e4 LT |
1637 | break; |
1638 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1639 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1640 | break; |
1641 | default: | |
f466722c | 1642 | rdev->saved_raid_disk = role; |
5fd6c1dc | 1643 | if ((le32_to_cpu(sb->feature_map) & |
f466722c | 1644 | MD_FEATURE_RECOVERY_OFFSET)) { |
5fd6c1dc | 1645 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
f466722c N |
1646 | if (!(le32_to_cpu(sb->feature_map) & |
1647 | MD_FEATURE_RECOVERY_BITMAP)) | |
1648 | rdev->saved_raid_disk = -1; | |
1649 | } else | |
5fd6c1dc | 1650 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1651 | rdev->raid_disk = role; |
1652 | break; | |
1653 | } | |
8ddf9efe N |
1654 | if (sb->devflags & WriteMostly1) |
1655 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1656 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1657 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1658 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1659 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1660 | |
1da177e4 LT |
1661 | return 0; |
1662 | } | |
1663 | ||
fd01b88c | 1664 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1665 | { |
1666 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1667 | struct md_rdev *rdev2; |
1da177e4 LT |
1668 | int max_dev, i; |
1669 | /* make rdev->sb match mddev and rdev data. */ | |
1670 | ||
65a06f06 | 1671 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1672 | |
1673 | sb->feature_map = 0; | |
1674 | sb->pad0 = 0; | |
5fd6c1dc | 1675 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1676 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1677 | ||
1678 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1679 | sb->events = cpu_to_le64(mddev->events); | |
1680 | if (mddev->in_sync) | |
1681 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1682 | else | |
1683 | sb->resync_offset = cpu_to_le64(0); | |
1684 | ||
1c05b4bc | 1685 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1686 | |
f0ca340c | 1687 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1688 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1689 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1690 | sb->level = cpu_to_le32(mddev->level); |
1691 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1692 | |
aeb9b211 N |
1693 | if (test_bit(WriteMostly, &rdev->flags)) |
1694 | sb->devflags |= WriteMostly1; | |
1695 | else | |
1696 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1697 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1698 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1699 | |
c3d9714e N |
1700 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1701 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1702 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1703 | } |
5fd6c1dc N |
1704 | |
1705 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1706 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1707 | sb->feature_map |= |
1708 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1709 | sb->recovery_offset = | |
1710 | cpu_to_le64(rdev->recovery_offset); | |
f466722c N |
1711 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
1712 | sb->feature_map |= | |
1713 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); | |
5fd6c1dc | 1714 | } |
2d78f8c4 N |
1715 | if (test_bit(Replacement, &rdev->flags)) |
1716 | sb->feature_map |= | |
1717 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1718 | |
f6705578 N |
1719 | if (mddev->reshape_position != MaxSector) { |
1720 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1721 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1722 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1723 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1724 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1725 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1726 | if (mddev->delta_disks == 0 && |
1727 | mddev->reshape_backwards) | |
1728 | sb->feature_map | |
1729 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1730 | if (rdev->new_data_offset != rdev->data_offset) { |
1731 | sb->feature_map | |
1732 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1733 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1734 | - rdev->data_offset)); | |
1735 | } | |
f6705578 | 1736 | } |
a654b9d8 | 1737 | |
3c462c88 GR |
1738 | if (mddev_is_clustered(mddev)) |
1739 | sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED); | |
1740 | ||
2699b672 N |
1741 | if (rdev->badblocks.count == 0) |
1742 | /* Nothing to do for bad blocks*/ ; | |
1743 | else if (sb->bblog_offset == 0) | |
1744 | /* Cannot record bad blocks on this device */ | |
1745 | md_error(mddev, rdev); | |
1746 | else { | |
1747 | struct badblocks *bb = &rdev->badblocks; | |
1748 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1749 | u64 *p = bb->page; | |
1750 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1751 | if (bb->changed) { | |
1752 | unsigned seq; | |
1753 | ||
1754 | retry: | |
1755 | seq = read_seqbegin(&bb->lock); | |
1756 | ||
1757 | memset(bbp, 0xff, PAGE_SIZE); | |
1758 | ||
1759 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1760 | u64 internal_bb = p[i]; |
2699b672 N |
1761 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1762 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1763 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1764 | } |
d0962936 | 1765 | bb->changed = 0; |
2699b672 N |
1766 | if (read_seqretry(&bb->lock, seq)) |
1767 | goto retry; | |
1768 | ||
1769 | bb->sector = (rdev->sb_start + | |
1770 | (int)le32_to_cpu(sb->bblog_offset)); | |
1771 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1772 | } |
1773 | } | |
1774 | ||
1da177e4 | 1775 | max_dev = 0; |
dafb20fa | 1776 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1777 | if (rdev2->desc_nr+1 > max_dev) |
1778 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1779 | |
70471daf N |
1780 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1781 | int bmask; | |
a778b73f | 1782 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1783 | rdev->sb_size = max_dev * 2 + 256; |
1784 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1785 | if (rdev->sb_size & bmask) | |
1786 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1787 | } else |
1788 | max_dev = le32_to_cpu(sb->max_dev); | |
1789 | ||
1da177e4 LT |
1790 | for (i=0; i<max_dev;i++) |
1791 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
f72ffdd6 | 1792 | |
dafb20fa | 1793 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1794 | i = rdev2->desc_nr; |
b2d444d7 | 1795 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1796 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1797 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1798 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1799 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1800 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1801 | else |
1802 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1803 | } | |
1804 | ||
1da177e4 LT |
1805 | sb->sb_csum = calc_sb_1_csum(sb); |
1806 | } | |
1807 | ||
0cd17fec | 1808 | static unsigned long long |
3cb03002 | 1809 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1810 | { |
1811 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1812 | sector_t max_sectors; |
58c0fed4 | 1813 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1814 | return 0; /* component must fit device */ |
c6563a8c N |
1815 | if (rdev->data_offset != rdev->new_data_offset) |
1816 | return 0; /* too confusing */ | |
0f420358 | 1817 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1818 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1819 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1820 | max_sectors -= rdev->data_offset; |
1821 | if (!num_sectors || num_sectors > max_sectors) | |
1822 | num_sectors = max_sectors; | |
c3d9714e | 1823 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1824 | /* minor version 0 with bitmap we can't move */ |
1825 | return 0; | |
1826 | } else { | |
1827 | /* minor version 0; superblock after data */ | |
0f420358 | 1828 | sector_t sb_start; |
77304d2a | 1829 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1830 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1831 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1832 | if (!num_sectors || num_sectors > max_sectors) |
1833 | num_sectors = max_sectors; | |
0f420358 | 1834 | rdev->sb_start = sb_start; |
0cd17fec | 1835 | } |
65a06f06 | 1836 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1837 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1838 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1839 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1840 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1841 | rdev->sb_page); |
1842 | md_super_wait(rdev->mddev); | |
c26a44ed | 1843 | return num_sectors; |
c6563a8c N |
1844 | |
1845 | } | |
1846 | ||
1847 | static int | |
1848 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1849 | unsigned long long new_offset) | |
1850 | { | |
1851 | /* All necessary checks on new >= old have been done */ | |
1852 | struct bitmap *bitmap; | |
1853 | if (new_offset >= rdev->data_offset) | |
1854 | return 1; | |
1855 | ||
1856 | /* with 1.0 metadata, there is no metadata to tread on | |
1857 | * so we can always move back */ | |
1858 | if (rdev->mddev->minor_version == 0) | |
1859 | return 1; | |
1860 | ||
1861 | /* otherwise we must be sure not to step on | |
1862 | * any metadata, so stay: | |
1863 | * 36K beyond start of superblock | |
1864 | * beyond end of badblocks | |
1865 | * beyond write-intent bitmap | |
1866 | */ | |
1867 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1868 | return 0; | |
1869 | bitmap = rdev->mddev->bitmap; | |
1870 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1871 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 1872 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
1873 | return 0; |
1874 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1875 | return 0; | |
1876 | ||
1877 | return 1; | |
0cd17fec | 1878 | } |
1da177e4 | 1879 | |
75c96f85 | 1880 | static struct super_type super_types[] = { |
1da177e4 LT |
1881 | [0] = { |
1882 | .name = "0.90.0", | |
1883 | .owner = THIS_MODULE, | |
0cd17fec CW |
1884 | .load_super = super_90_load, |
1885 | .validate_super = super_90_validate, | |
1886 | .sync_super = super_90_sync, | |
1887 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1888 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1889 | }, |
1890 | [1] = { | |
1891 | .name = "md-1", | |
1892 | .owner = THIS_MODULE, | |
0cd17fec CW |
1893 | .load_super = super_1_load, |
1894 | .validate_super = super_1_validate, | |
1895 | .sync_super = super_1_sync, | |
1896 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1897 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1898 | }, |
1899 | }; | |
1da177e4 | 1900 | |
fd01b88c | 1901 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1902 | { |
1903 | if (mddev->sync_super) { | |
1904 | mddev->sync_super(mddev, rdev); | |
1905 | return; | |
1906 | } | |
1907 | ||
1908 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1909 | ||
1910 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1911 | } | |
1912 | ||
fd01b88c | 1913 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1914 | { |
3cb03002 | 1915 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1916 | |
4b80991c N |
1917 | rcu_read_lock(); |
1918 | rdev_for_each_rcu(rdev, mddev1) | |
1919 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1920 | if (rdev->bdev->bd_contains == |
4b80991c N |
1921 | rdev2->bdev->bd_contains) { |
1922 | rcu_read_unlock(); | |
7dd5e7c3 | 1923 | return 1; |
4b80991c N |
1924 | } |
1925 | rcu_read_unlock(); | |
1da177e4 LT |
1926 | return 0; |
1927 | } | |
1928 | ||
1929 | static LIST_HEAD(pending_raid_disks); | |
1930 | ||
ac5e7113 AN |
1931 | /* |
1932 | * Try to register data integrity profile for an mddev | |
1933 | * | |
1934 | * This is called when an array is started and after a disk has been kicked | |
1935 | * from the array. It only succeeds if all working and active component devices | |
1936 | * are integrity capable with matching profiles. | |
1937 | */ | |
fd01b88c | 1938 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1939 | { |
3cb03002 | 1940 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1941 | |
1942 | if (list_empty(&mddev->disks)) | |
1943 | return 0; /* nothing to do */ | |
629acb6a JB |
1944 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1945 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 1946 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
1947 | /* skip spares and non-functional disks */ |
1948 | if (test_bit(Faulty, &rdev->flags)) | |
1949 | continue; | |
1950 | if (rdev->raid_disk < 0) | |
1951 | continue; | |
ac5e7113 AN |
1952 | if (!reference) { |
1953 | /* Use the first rdev as the reference */ | |
1954 | reference = rdev; | |
1955 | continue; | |
1956 | } | |
1957 | /* does this rdev's profile match the reference profile? */ | |
1958 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1959 | rdev->bdev->bd_disk) < 0) | |
1960 | return -EINVAL; | |
1961 | } | |
89078d57 MP |
1962 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1963 | return 0; | |
ac5e7113 AN |
1964 | /* |
1965 | * All component devices are integrity capable and have matching | |
1966 | * profiles, register the common profile for the md device. | |
1967 | */ | |
1968 | if (blk_integrity_register(mddev->gendisk, | |
1969 | bdev_get_integrity(reference->bdev)) != 0) { | |
1970 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1971 | mdname(mddev)); | |
1972 | return -EINVAL; | |
1973 | } | |
a91a2785 MP |
1974 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
1975 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
1976 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
1977 | mdname(mddev)); | |
1978 | return -EINVAL; | |
1979 | } | |
ac5e7113 AN |
1980 | return 0; |
1981 | } | |
1982 | EXPORT_SYMBOL(md_integrity_register); | |
1983 | ||
1984 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 1985 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 1986 | { |
2863b9eb JB |
1987 | struct blk_integrity *bi_rdev; |
1988 | struct blk_integrity *bi_mddev; | |
1989 | ||
1990 | if (!mddev->gendisk) | |
1991 | return; | |
1992 | ||
1993 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
1994 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 1995 | |
ac5e7113 | 1996 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1997 | return; |
ac5e7113 | 1998 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1999 | return; |
ac5e7113 AN |
2000 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2001 | rdev->bdev->bd_disk) >= 0) | |
2002 | return; | |
2003 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2004 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2005 | } |
ac5e7113 | 2006 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2007 | |
f72ffdd6 | 2008 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 2009 | { |
7dd5e7c3 | 2010 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2011 | struct kobject *ko; |
5e55e2f5 | 2012 | int err; |
1da177e4 | 2013 | |
11e2ede0 DW |
2014 | /* prevent duplicates */ |
2015 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2016 | return -EEXIST; | |
2017 | ||
dd8ac336 AN |
2018 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2019 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2020 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2021 | if (mddev->pers) { |
2022 | /* Cannot change size, so fail | |
2023 | * If mddev->level <= 0, then we don't care | |
2024 | * about aligning sizes (e.g. linear) | |
2025 | */ | |
2026 | if (mddev->level > 0) | |
2027 | return -ENOSPC; | |
2028 | } else | |
dd8ac336 | 2029 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2030 | } |
1da177e4 LT |
2031 | |
2032 | /* Verify rdev->desc_nr is unique. | |
2033 | * If it is -1, assign a free number, else | |
2034 | * check number is not in use | |
2035 | */ | |
4878e9eb | 2036 | rcu_read_lock(); |
1da177e4 LT |
2037 | if (rdev->desc_nr < 0) { |
2038 | int choice = 0; | |
4878e9eb N |
2039 | if (mddev->pers) |
2040 | choice = mddev->raid_disks; | |
57d051dc | 2041 | while (md_find_rdev_nr_rcu(mddev, choice)) |
1da177e4 LT |
2042 | choice++; |
2043 | rdev->desc_nr = choice; | |
2044 | } else { | |
57d051dc | 2045 | if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
4878e9eb | 2046 | rcu_read_unlock(); |
1da177e4 | 2047 | return -EBUSY; |
4878e9eb | 2048 | } |
1da177e4 | 2049 | } |
4878e9eb | 2050 | rcu_read_unlock(); |
de01dfad N |
2051 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2052 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2053 | mdname(mddev), mddev->max_disks); | |
2054 | return -EBUSY; | |
2055 | } | |
19133a42 | 2056 | bdevname(rdev->bdev,b); |
90a9befb | 2057 | strreplace(b, '/', '!'); |
649316b2 | 2058 | |
1da177e4 | 2059 | rdev->mddev = mddev; |
19133a42 | 2060 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2061 | |
b2d6db58 | 2062 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2063 | goto fail; |
86e6ffdd | 2064 | |
0762b8bd | 2065 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2066 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2067 | /* failure here is OK */; | |
2068 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2069 | |
4b80991c | 2070 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2071 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2072 | |
2073 | /* May as well allow recovery to be retried once */ | |
5389042f | 2074 | mddev->recovery_disabled++; |
3f9d99c1 | 2075 | |
1da177e4 | 2076 | return 0; |
5e55e2f5 N |
2077 | |
2078 | fail: | |
2079 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2080 | b, mdname(mddev)); | |
2081 | return err; | |
1da177e4 LT |
2082 | } |
2083 | ||
177a99b2 | 2084 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2085 | { |
3cb03002 | 2086 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2087 | kobject_del(&rdev->kobj); |
177a99b2 | 2088 | kobject_put(&rdev->kobj); |
5792a285 N |
2089 | } |
2090 | ||
f72ffdd6 | 2091 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2092 | { |
2093 | char b[BDEVNAME_SIZE]; | |
403df478 | 2094 | |
49731baa | 2095 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2096 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2097 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2098 | rdev->mddev = NULL; | |
86e6ffdd | 2099 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2100 | sysfs_put(rdev->sysfs_state); |
2101 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2102 | rdev->badblocks.count = 0; |
5792a285 | 2103 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2104 | * writing to 'remove' to "dev/state". We also need |
2105 | * to delay it due to rcu usage. | |
5792a285 | 2106 | */ |
4b80991c | 2107 | synchronize_rcu(); |
177a99b2 N |
2108 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2109 | kobject_get(&rdev->kobj); | |
e804ac78 | 2110 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2111 | } |
2112 | ||
2113 | /* | |
2114 | * prevent the device from being mounted, repartitioned or | |
2115 | * otherwise reused by a RAID array (or any other kernel | |
2116 | * subsystem), by bd_claiming the device. | |
2117 | */ | |
3cb03002 | 2118 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2119 | { |
2120 | int err = 0; | |
2121 | struct block_device *bdev; | |
2122 | char b[BDEVNAME_SIZE]; | |
2123 | ||
d4d77629 | 2124 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2125 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2126 | if (IS_ERR(bdev)) { |
2127 | printk(KERN_ERR "md: could not open %s.\n", | |
2128 | __bdevname(dev, b)); | |
2129 | return PTR_ERR(bdev); | |
2130 | } | |
1da177e4 LT |
2131 | rdev->bdev = bdev; |
2132 | return err; | |
2133 | } | |
2134 | ||
3cb03002 | 2135 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2136 | { |
2137 | struct block_device *bdev = rdev->bdev; | |
2138 | rdev->bdev = NULL; | |
e525fd89 | 2139 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2140 | } |
2141 | ||
2142 | void md_autodetect_dev(dev_t dev); | |
2143 | ||
f72ffdd6 | 2144 | static void export_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2145 | { |
2146 | char b[BDEVNAME_SIZE]; | |
403df478 | 2147 | |
1da177e4 LT |
2148 | printk(KERN_INFO "md: export_rdev(%s)\n", |
2149 | bdevname(rdev->bdev,b)); | |
545c8795 | 2150 | md_rdev_clear(rdev); |
1da177e4 | 2151 | #ifndef MODULE |
d0fae18f N |
2152 | if (test_bit(AutoDetected, &rdev->flags)) |
2153 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2154 | #endif |
2155 | unlock_rdev(rdev); | |
86e6ffdd | 2156 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2157 | } |
2158 | ||
fb56dfef | 2159 | void md_kick_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2160 | { |
2161 | unbind_rdev_from_array(rdev); | |
2162 | export_rdev(rdev); | |
2163 | } | |
fb56dfef | 2164 | EXPORT_SYMBOL_GPL(md_kick_rdev_from_array); |
1da177e4 | 2165 | |
fd01b88c | 2166 | static void export_array(struct mddev *mddev) |
1da177e4 | 2167 | { |
0638bb0e | 2168 | struct md_rdev *rdev; |
1da177e4 | 2169 | |
0638bb0e N |
2170 | while (!list_empty(&mddev->disks)) { |
2171 | rdev = list_first_entry(&mddev->disks, struct md_rdev, | |
2172 | same_set); | |
fb56dfef | 2173 | md_kick_rdev_from_array(rdev); |
1da177e4 | 2174 | } |
1da177e4 LT |
2175 | mddev->raid_disks = 0; |
2176 | mddev->major_version = 0; | |
2177 | } | |
2178 | ||
f72ffdd6 | 2179 | static void sync_sbs(struct mddev *mddev, int nospares) |
1da177e4 | 2180 | { |
42543769 N |
2181 | /* Update each superblock (in-memory image), but |
2182 | * if we are allowed to, skip spares which already | |
2183 | * have the right event counter, or have one earlier | |
2184 | * (which would mean they aren't being marked as dirty | |
2185 | * with the rest of the array) | |
2186 | */ | |
3cb03002 | 2187 | struct md_rdev *rdev; |
dafb20fa | 2188 | rdev_for_each(rdev, mddev) { |
42543769 N |
2189 | if (rdev->sb_events == mddev->events || |
2190 | (nospares && | |
2191 | rdev->raid_disk < 0 && | |
42543769 N |
2192 | rdev->sb_events+1 == mddev->events)) { |
2193 | /* Don't update this superblock */ | |
2194 | rdev->sb_loaded = 2; | |
2195 | } else { | |
076f968b | 2196 | sync_super(mddev, rdev); |
42543769 N |
2197 | rdev->sb_loaded = 1; |
2198 | } | |
1da177e4 LT |
2199 | } |
2200 | } | |
2201 | ||
2aa82191 GR |
2202 | static bool does_sb_need_changing(struct mddev *mddev) |
2203 | { | |
2204 | struct md_rdev *rdev; | |
2205 | struct mdp_superblock_1 *sb; | |
2206 | int role; | |
2207 | ||
2208 | /* Find a good rdev */ | |
2209 | rdev_for_each(rdev, mddev) | |
2210 | if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags)) | |
2211 | break; | |
2212 | ||
2213 | /* No good device found. */ | |
2214 | if (!rdev) | |
2215 | return false; | |
2216 | ||
2217 | sb = page_address(rdev->sb_page); | |
2218 | /* Check if a device has become faulty or a spare become active */ | |
2219 | rdev_for_each(rdev, mddev) { | |
2220 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
2221 | /* Device activated? */ | |
2222 | if (role == 0xffff && rdev->raid_disk >=0 && | |
2223 | !test_bit(Faulty, &rdev->flags)) | |
2224 | return true; | |
2225 | /* Device turned faulty? */ | |
2226 | if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd)) | |
2227 | return true; | |
2228 | } | |
2229 | ||
2230 | /* Check if any mddev parameters have changed */ | |
2231 | if ((mddev->dev_sectors != le64_to_cpu(sb->size)) || | |
2232 | (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) || | |
2233 | (mddev->recovery_cp != le64_to_cpu(sb->resync_offset)) || | |
2234 | (mddev->layout != le64_to_cpu(sb->layout)) || | |
2235 | (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || | |
2236 | (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) | |
2237 | return true; | |
2238 | ||
2239 | return false; | |
2240 | } | |
2241 | ||
1aee41f6 | 2242 | void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2243 | { |
3cb03002 | 2244 | struct md_rdev *rdev; |
06d91a5f | 2245 | int sync_req; |
42543769 | 2246 | int nospares = 0; |
2699b672 | 2247 | int any_badblocks_changed = 0; |
1da177e4 | 2248 | |
d87f064f N |
2249 | if (mddev->ro) { |
2250 | if (force_change) | |
2251 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2252 | return; | |
2253 | } | |
2aa82191 GR |
2254 | |
2255 | if (mddev_is_clustered(mddev)) { | |
2256 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
2257 | force_change = 1; | |
2258 | md_cluster_ops->metadata_update_start(mddev); | |
2259 | /* Has someone else has updated the sb */ | |
2260 | if (!does_sb_need_changing(mddev)) { | |
2261 | md_cluster_ops->metadata_update_cancel(mddev); | |
2262 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
2263 | return; | |
2264 | } | |
2265 | } | |
1da177e4 | 2266 | repeat: |
3a3a5ddb | 2267 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2268 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2269 | if (rdev->raid_disk >= 0 && |
2270 | mddev->delta_disks >= 0 && | |
2271 | !test_bit(In_sync, &rdev->flags) && | |
2272 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2273 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2274 | ||
f72ffdd6 | 2275 | } |
bd52b746 | 2276 | if (!mddev->persistent) { |
070dc6dd | 2277 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2278 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2279 | if (!mddev->external) { |
d97a41dc | 2280 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2281 | rdev_for_each(rdev, mddev) { |
de393cde | 2282 | if (rdev->badblocks.changed) { |
d0962936 | 2283 | rdev->badblocks.changed = 0; |
de393cde N |
2284 | md_ack_all_badblocks(&rdev->badblocks); |
2285 | md_error(mddev, rdev); | |
2286 | } | |
2287 | clear_bit(Blocked, &rdev->flags); | |
2288 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2289 | wake_up(&rdev->blocked_wait); | |
2290 | } | |
2291 | } | |
3a3a5ddb N |
2292 | wake_up(&mddev->sb_wait); |
2293 | return; | |
2294 | } | |
2295 | ||
85572d7c | 2296 | spin_lock(&mddev->lock); |
84692195 | 2297 | |
3a3a5ddb N |
2298 | mddev->utime = get_seconds(); |
2299 | ||
850b2b42 N |
2300 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2301 | force_change = 1; | |
2302 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2303 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2304 | * though if events isn't the right even/odd, we will have to do | |
2305 | * spares after all | |
2306 | */ | |
2307 | nospares = 1; | |
2308 | if (force_change) | |
2309 | nospares = 0; | |
2310 | if (mddev->degraded) | |
84692195 N |
2311 | /* If the array is degraded, then skipping spares is both |
2312 | * dangerous and fairly pointless. | |
2313 | * Dangerous because a device that was removed from the array | |
2314 | * might have a event_count that still looks up-to-date, | |
2315 | * so it can be re-added without a resync. | |
2316 | * Pointless because if there are any spares to skip, | |
2317 | * then a recovery will happen and soon that array won't | |
2318 | * be degraded any more and the spare can go back to sleep then. | |
2319 | */ | |
850b2b42 | 2320 | nospares = 0; |
84692195 | 2321 | |
06d91a5f | 2322 | sync_req = mddev->in_sync; |
42543769 N |
2323 | |
2324 | /* If this is just a dirty<->clean transition, and the array is clean | |
2325 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2326 | if (nospares |
42543769 | 2327 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2328 | && mddev->can_decrease_events |
2329 | && mddev->events != 1) { | |
42543769 | 2330 | mddev->events--; |
a8707c08 N |
2331 | mddev->can_decrease_events = 0; |
2332 | } else { | |
42543769 N |
2333 | /* otherwise we have to go forward and ... */ |
2334 | mddev->events ++; | |
a8707c08 | 2335 | mddev->can_decrease_events = nospares; |
42543769 | 2336 | } |
1da177e4 | 2337 | |
403df478 N |
2338 | /* |
2339 | * This 64-bit counter should never wrap. | |
2340 | * Either we are in around ~1 trillion A.C., assuming | |
2341 | * 1 reboot per second, or we have a bug... | |
2342 | */ | |
2343 | WARN_ON(mddev->events == 0); | |
2699b672 | 2344 | |
dafb20fa | 2345 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2346 | if (rdev->badblocks.changed) |
2347 | any_badblocks_changed++; | |
de393cde N |
2348 | if (test_bit(Faulty, &rdev->flags)) |
2349 | set_bit(FaultRecorded, &rdev->flags); | |
2350 | } | |
2699b672 | 2351 | |
e691063a | 2352 | sync_sbs(mddev, nospares); |
85572d7c | 2353 | spin_unlock(&mddev->lock); |
1da177e4 | 2354 | |
36a4e1fe N |
2355 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2356 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2357 | |
4ad13663 | 2358 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2359 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2360 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2361 | |
42543769 N |
2362 | if (rdev->sb_loaded != 1) |
2363 | continue; /* no noise on spare devices */ | |
1da177e4 | 2364 | |
f466722c | 2365 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2366 | md_super_write(mddev,rdev, |
0f420358 | 2367 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2368 | rdev->sb_page); |
36a4e1fe N |
2369 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2370 | bdevname(rdev->bdev, b), | |
2371 | (unsigned long long)rdev->sb_start); | |
42543769 | 2372 | rdev->sb_events = mddev->events; |
2699b672 N |
2373 | if (rdev->badblocks.size) { |
2374 | md_super_write(mddev, rdev, | |
2375 | rdev->badblocks.sector, | |
2376 | rdev->badblocks.size << 9, | |
2377 | rdev->bb_page); | |
2378 | rdev->badblocks.size = 0; | |
2379 | } | |
7bfa19f2 | 2380 | |
f466722c | 2381 | } else |
36a4e1fe N |
2382 | pr_debug("md: %s (skipping faulty)\n", |
2383 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2384 | |
7bfa19f2 | 2385 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2386 | /* only need to write one superblock... */ |
2387 | break; | |
2388 | } | |
a9701a30 | 2389 | md_super_wait(mddev); |
850b2b42 | 2390 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2391 | |
85572d7c | 2392 | spin_lock(&mddev->lock); |
850b2b42 N |
2393 | if (mddev->in_sync != sync_req || |
2394 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2395 | /* have to write it out again */ |
85572d7c | 2396 | spin_unlock(&mddev->lock); |
06d91a5f N |
2397 | goto repeat; |
2398 | } | |
850b2b42 | 2399 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
85572d7c | 2400 | spin_unlock(&mddev->lock); |
3d310eb7 | 2401 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2402 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2403 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2404 | |
dafb20fa | 2405 | rdev_for_each(rdev, mddev) { |
de393cde N |
2406 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2407 | clear_bit(Blocked, &rdev->flags); | |
2408 | ||
2409 | if (any_badblocks_changed) | |
2699b672 | 2410 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2411 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2412 | wake_up(&rdev->blocked_wait); | |
2413 | } | |
2aa82191 GR |
2414 | |
2415 | if (mddev_is_clustered(mddev)) | |
2416 | md_cluster_ops->metadata_update_finish(mddev); | |
1da177e4 | 2417 | } |
1aee41f6 | 2418 | EXPORT_SYMBOL(md_update_sb); |
1da177e4 | 2419 | |
a6da4ef8 GR |
2420 | static int add_bound_rdev(struct md_rdev *rdev) |
2421 | { | |
2422 | struct mddev *mddev = rdev->mddev; | |
2423 | int err = 0; | |
2424 | ||
2425 | if (!mddev->pers->hot_remove_disk) { | |
2426 | /* If there is hot_add_disk but no hot_remove_disk | |
2427 | * then added disks for geometry changes, | |
2428 | * and should be added immediately. | |
2429 | */ | |
2430 | super_types[mddev->major_version]. | |
2431 | validate_super(mddev, rdev); | |
2432 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
2433 | if (err) { | |
2434 | unbind_rdev_from_array(rdev); | |
2435 | export_rdev(rdev); | |
2436 | return err; | |
2437 | } | |
2438 | } | |
2439 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
2440 | ||
2441 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2442 | if (mddev->degraded) | |
2443 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
2444 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2445 | md_new_event(mddev); | |
2446 | md_wakeup_thread(mddev->thread); | |
2447 | return 0; | |
2448 | } | |
1da177e4 | 2449 | |
7f6ce769 | 2450 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2451 | * We want to accept with case. For this we use cmd_match. |
2452 | */ | |
2453 | static int cmd_match(const char *cmd, const char *str) | |
2454 | { | |
2455 | /* See if cmd, written into a sysfs file, matches | |
2456 | * str. They must either be the same, or cmd can | |
2457 | * have a trailing newline | |
2458 | */ | |
2459 | while (*cmd && *str && *cmd == *str) { | |
2460 | cmd++; | |
2461 | str++; | |
2462 | } | |
2463 | if (*cmd == '\n') | |
2464 | cmd++; | |
2465 | if (*str || *cmd) | |
2466 | return 0; | |
2467 | return 1; | |
2468 | } | |
2469 | ||
86e6ffdd N |
2470 | struct rdev_sysfs_entry { |
2471 | struct attribute attr; | |
3cb03002 N |
2472 | ssize_t (*show)(struct md_rdev *, char *); |
2473 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2474 | }; |
2475 | ||
2476 | static ssize_t | |
3cb03002 | 2477 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2478 | { |
2479 | char *sep = ""; | |
20a49ff6 | 2480 | size_t len = 0; |
758bfc8a | 2481 | unsigned long flags = ACCESS_ONCE(rdev->flags); |
86e6ffdd | 2482 | |
758bfc8a | 2483 | if (test_bit(Faulty, &flags) || |
de393cde | 2484 | rdev->badblocks.unacked_exist) { |
86e6ffdd N |
2485 | len+= sprintf(page+len, "%sfaulty",sep); |
2486 | sep = ","; | |
2487 | } | |
758bfc8a | 2488 | if (test_bit(In_sync, &flags)) { |
86e6ffdd N |
2489 | len += sprintf(page+len, "%sin_sync",sep); |
2490 | sep = ","; | |
2491 | } | |
758bfc8a | 2492 | if (test_bit(WriteMostly, &flags)) { |
f655675b N |
2493 | len += sprintf(page+len, "%swrite_mostly",sep); |
2494 | sep = ","; | |
2495 | } | |
758bfc8a | 2496 | if (test_bit(Blocked, &flags) || |
52c64152 | 2497 | (rdev->badblocks.unacked_exist |
758bfc8a | 2498 | && !test_bit(Faulty, &flags))) { |
6bfe0b49 DW |
2499 | len += sprintf(page+len, "%sblocked", sep); |
2500 | sep = ","; | |
2501 | } | |
758bfc8a N |
2502 | if (!test_bit(Faulty, &flags) && |
2503 | !test_bit(In_sync, &flags)) { | |
86e6ffdd N |
2504 | len += sprintf(page+len, "%sspare", sep); |
2505 | sep = ","; | |
2506 | } | |
758bfc8a | 2507 | if (test_bit(WriteErrorSeen, &flags)) { |
d7a9d443 N |
2508 | len += sprintf(page+len, "%swrite_error", sep); |
2509 | sep = ","; | |
2510 | } | |
758bfc8a | 2511 | if (test_bit(WantReplacement, &flags)) { |
2d78f8c4 N |
2512 | len += sprintf(page+len, "%swant_replacement", sep); |
2513 | sep = ","; | |
2514 | } | |
758bfc8a | 2515 | if (test_bit(Replacement, &flags)) { |
2d78f8c4 N |
2516 | len += sprintf(page+len, "%sreplacement", sep); |
2517 | sep = ","; | |
2518 | } | |
2519 | ||
86e6ffdd N |
2520 | return len+sprintf(page+len, "\n"); |
2521 | } | |
2522 | ||
45dc2de1 | 2523 | static ssize_t |
3cb03002 | 2524 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2525 | { |
2526 | /* can write | |
de393cde | 2527 | * faulty - simulates an error |
45dc2de1 | 2528 | * remove - disconnects the device |
f655675b N |
2529 | * writemostly - sets write_mostly |
2530 | * -writemostly - clears write_mostly | |
de393cde N |
2531 | * blocked - sets the Blocked flags |
2532 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2533 | * insync - sets Insync providing device isn't active |
f466722c N |
2534 | * -insync - clear Insync for a device with a slot assigned, |
2535 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2536 | * write_error - sets WriteErrorSeen |
2537 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2538 | */ |
2539 | int err = -EINVAL; | |
2540 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2541 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2542 | if (test_bit(Faulty, &rdev->flags)) |
2543 | err = 0; | |
2544 | else | |
2545 | err = -EBUSY; | |
45dc2de1 N |
2546 | } else if (cmd_match(buf, "remove")) { |
2547 | if (rdev->raid_disk >= 0) | |
2548 | err = -EBUSY; | |
2549 | else { | |
fd01b88c | 2550 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2551 | err = 0; |
a9720903 GJ |
2552 | if (mddev_is_clustered(mddev)) |
2553 | err = md_cluster_ops->remove_disk(mddev, rdev); | |
2554 | ||
2555 | if (err == 0) { | |
2556 | md_kick_rdev_from_array(rdev); | |
2557 | if (mddev->pers) | |
2558 | md_update_sb(mddev, 1); | |
2559 | md_new_event(mddev); | |
2560 | } | |
45dc2de1 | 2561 | } |
f655675b N |
2562 | } else if (cmd_match(buf, "writemostly")) { |
2563 | set_bit(WriteMostly, &rdev->flags); | |
2564 | err = 0; | |
2565 | } else if (cmd_match(buf, "-writemostly")) { | |
2566 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2567 | err = 0; |
2568 | } else if (cmd_match(buf, "blocked")) { | |
2569 | set_bit(Blocked, &rdev->flags); | |
2570 | err = 0; | |
2571 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2572 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2573 | rdev->badblocks.unacked_exist) { |
de393cde N |
2574 | /* metadata handler doesn't understand badblocks, |
2575 | * so we need to fail the device | |
2576 | */ | |
2577 | md_error(rdev->mddev, rdev); | |
2578 | } | |
6bfe0b49 | 2579 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2580 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2581 | wake_up(&rdev->blocked_wait); |
2582 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2583 | md_wakeup_thread(rdev->mddev->thread); | |
2584 | ||
6d56e278 N |
2585 | err = 0; |
2586 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2587 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2588 | err = 0; |
f466722c | 2589 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) { |
e1960f8c N |
2590 | if (rdev->mddev->pers == NULL) { |
2591 | clear_bit(In_sync, &rdev->flags); | |
2592 | rdev->saved_raid_disk = rdev->raid_disk; | |
2593 | rdev->raid_disk = -1; | |
2594 | err = 0; | |
2595 | } | |
d7a9d443 N |
2596 | } else if (cmd_match(buf, "write_error")) { |
2597 | set_bit(WriteErrorSeen, &rdev->flags); | |
2598 | err = 0; | |
2599 | } else if (cmd_match(buf, "-write_error")) { | |
2600 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2601 | err = 0; | |
2d78f8c4 N |
2602 | } else if (cmd_match(buf, "want_replacement")) { |
2603 | /* Any non-spare device that is not a replacement can | |
2604 | * become want_replacement at any time, but we then need to | |
2605 | * check if recovery is needed. | |
2606 | */ | |
2607 | if (rdev->raid_disk >= 0 && | |
2608 | !test_bit(Replacement, &rdev->flags)) | |
2609 | set_bit(WantReplacement, &rdev->flags); | |
2610 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2611 | md_wakeup_thread(rdev->mddev->thread); | |
2612 | err = 0; | |
2613 | } else if (cmd_match(buf, "-want_replacement")) { | |
2614 | /* Clearing 'want_replacement' is always allowed. | |
2615 | * Once replacements starts it is too late though. | |
2616 | */ | |
2617 | err = 0; | |
2618 | clear_bit(WantReplacement, &rdev->flags); | |
2619 | } else if (cmd_match(buf, "replacement")) { | |
2620 | /* Can only set a device as a replacement when array has not | |
2621 | * yet been started. Once running, replacement is automatic | |
2622 | * from spares, or by assigning 'slot'. | |
2623 | */ | |
2624 | if (rdev->mddev->pers) | |
2625 | err = -EBUSY; | |
2626 | else { | |
2627 | set_bit(Replacement, &rdev->flags); | |
2628 | err = 0; | |
2629 | } | |
2630 | } else if (cmd_match(buf, "-replacement")) { | |
2631 | /* Similarly, can only clear Replacement before start */ | |
2632 | if (rdev->mddev->pers) | |
2633 | err = -EBUSY; | |
2634 | else { | |
2635 | clear_bit(Replacement, &rdev->flags); | |
2636 | err = 0; | |
2637 | } | |
a6da4ef8 GR |
2638 | } else if (cmd_match(buf, "re-add")) { |
2639 | if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) { | |
97f6cd39 GR |
2640 | /* clear_bit is performed _after_ all the devices |
2641 | * have their local Faulty bit cleared. If any writes | |
2642 | * happen in the meantime in the local node, they | |
2643 | * will land in the local bitmap, which will be synced | |
2644 | * by this node eventually | |
2645 | */ | |
2646 | if (!mddev_is_clustered(rdev->mddev) || | |
2647 | (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { | |
2648 | clear_bit(Faulty, &rdev->flags); | |
2649 | err = add_bound_rdev(rdev); | |
2650 | } | |
a6da4ef8 GR |
2651 | } else |
2652 | err = -EBUSY; | |
45dc2de1 | 2653 | } |
00bcb4ac N |
2654 | if (!err) |
2655 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2656 | return err ? err : len; |
2657 | } | |
80ca3a44 | 2658 | static struct rdev_sysfs_entry rdev_state = |
750f199e | 2659 | __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); |
86e6ffdd | 2660 | |
4dbcdc75 | 2661 | static ssize_t |
3cb03002 | 2662 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2663 | { |
2664 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2665 | } | |
2666 | ||
2667 | static ssize_t | |
3cb03002 | 2668 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 | 2669 | { |
4c9309c0 AD |
2670 | unsigned int n; |
2671 | int rv; | |
2672 | ||
2673 | rv = kstrtouint(buf, 10, &n); | |
2674 | if (rv < 0) | |
2675 | return rv; | |
2676 | atomic_set(&rdev->corrected_errors, n); | |
2677 | return len; | |
4dbcdc75 N |
2678 | } |
2679 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2680 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2681 | |
014236d2 | 2682 | static ssize_t |
3cb03002 | 2683 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2684 | { |
2685 | if (rdev->raid_disk < 0) | |
2686 | return sprintf(page, "none\n"); | |
2687 | else | |
2688 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2689 | } | |
2690 | ||
2691 | static ssize_t | |
3cb03002 | 2692 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 | 2693 | { |
4c9309c0 | 2694 | int slot; |
c303da6d | 2695 | int err; |
4c9309c0 | 2696 | |
014236d2 N |
2697 | if (strncmp(buf, "none", 4)==0) |
2698 | slot = -1; | |
4c9309c0 AD |
2699 | else { |
2700 | err = kstrtouint(buf, 10, (unsigned int *)&slot); | |
2701 | if (err < 0) | |
2702 | return err; | |
2703 | } | |
6c2fce2e | 2704 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2705 | /* Setting 'slot' on an active array requires also |
2706 | * updating the 'rd%d' link, and communicating | |
2707 | * with the personality with ->hot_*_disk. | |
2708 | * For now we only support removing | |
2709 | * failed/spare devices. This normally happens automatically, | |
2710 | * but not when the metadata is externally managed. | |
2711 | */ | |
c303da6d N |
2712 | if (rdev->raid_disk == -1) |
2713 | return -EEXIST; | |
2714 | /* personality does all needed checks */ | |
01393f3d | 2715 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2716 | return -EINVAL; |
746d3207 N |
2717 | clear_bit(Blocked, &rdev->flags); |
2718 | remove_and_add_spares(rdev->mddev, rdev); | |
2719 | if (rdev->raid_disk >= 0) | |
2720 | return -EBUSY; | |
c303da6d N |
2721 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2722 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2723 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2724 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2725 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2726 | */ |
2727 | ||
2728 | if (rdev->raid_disk != -1) | |
2729 | return -EBUSY; | |
2730 | ||
c6751b2b N |
2731 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2732 | return -EBUSY; | |
2733 | ||
6c2fce2e NB |
2734 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2735 | return -EINVAL; | |
2736 | ||
ba1b41b6 N |
2737 | if (slot >= rdev->mddev->raid_disks && |
2738 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2739 | return -ENOSPC; | |
2740 | ||
6c2fce2e NB |
2741 | rdev->raid_disk = slot; |
2742 | if (test_bit(In_sync, &rdev->flags)) | |
2743 | rdev->saved_raid_disk = slot; | |
2744 | else | |
2745 | rdev->saved_raid_disk = -1; | |
d30519fc | 2746 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2747 | clear_bit(Bitmap_sync, &rdev->flags); |
2910ff17 GR |
2748 | remove_and_add_spares(rdev->mddev, rdev); |
2749 | if (rdev->raid_disk == -1) | |
2750 | return -EBUSY; | |
6c2fce2e | 2751 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2752 | } else { |
ba1b41b6 N |
2753 | if (slot >= rdev->mddev->raid_disks && |
2754 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2755 | return -ENOSPC; |
2756 | rdev->raid_disk = slot; | |
2757 | /* assume it is working */ | |
c5d79adb N |
2758 | clear_bit(Faulty, &rdev->flags); |
2759 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2760 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2761 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2762 | } |
014236d2 N |
2763 | return len; |
2764 | } | |
2765 | ||
014236d2 | 2766 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2767 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2768 | |
93c8cad0 | 2769 | static ssize_t |
3cb03002 | 2770 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2771 | { |
6961ece4 | 2772 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2773 | } |
2774 | ||
2775 | static ssize_t | |
3cb03002 | 2776 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2777 | { |
c6563a8c | 2778 | unsigned long long offset; |
b29bebd6 | 2779 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 2780 | return -EINVAL; |
8ed0a521 | 2781 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2782 | return -EBUSY; |
dd8ac336 | 2783 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2784 | /* Must set offset before size, so overlap checks |
2785 | * can be sane */ | |
2786 | return -EBUSY; | |
93c8cad0 | 2787 | rdev->data_offset = offset; |
25f7fd47 | 2788 | rdev->new_data_offset = offset; |
93c8cad0 N |
2789 | return len; |
2790 | } | |
2791 | ||
2792 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2793 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2794 | |
c6563a8c N |
2795 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2796 | { | |
2797 | return sprintf(page, "%llu\n", | |
2798 | (unsigned long long)rdev->new_data_offset); | |
2799 | } | |
2800 | ||
2801 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2802 | const char *buf, size_t len) | |
2803 | { | |
2804 | unsigned long long new_offset; | |
2805 | struct mddev *mddev = rdev->mddev; | |
2806 | ||
b29bebd6 | 2807 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
2808 | return -EINVAL; |
2809 | ||
f851b60d N |
2810 | if (mddev->sync_thread || |
2811 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
2812 | return -EBUSY; |
2813 | if (new_offset == rdev->data_offset) | |
2814 | /* reset is always permitted */ | |
2815 | ; | |
2816 | else if (new_offset > rdev->data_offset) { | |
2817 | /* must not push array size beyond rdev_sectors */ | |
2818 | if (new_offset - rdev->data_offset | |
2819 | + mddev->dev_sectors > rdev->sectors) | |
2820 | return -E2BIG; | |
2821 | } | |
2822 | /* Metadata worries about other space details. */ | |
2823 | ||
2824 | /* decreasing the offset is inconsistent with a backwards | |
2825 | * reshape. | |
2826 | */ | |
2827 | if (new_offset < rdev->data_offset && | |
2828 | mddev->reshape_backwards) | |
2829 | return -EINVAL; | |
2830 | /* Increasing offset is inconsistent with forwards | |
2831 | * reshape. reshape_direction should be set to | |
2832 | * 'backwards' first. | |
2833 | */ | |
2834 | if (new_offset > rdev->data_offset && | |
2835 | !mddev->reshape_backwards) | |
2836 | return -EINVAL; | |
2837 | ||
2838 | if (mddev->pers && mddev->persistent && | |
2839 | !super_types[mddev->major_version] | |
2840 | .allow_new_offset(rdev, new_offset)) | |
2841 | return -E2BIG; | |
2842 | rdev->new_data_offset = new_offset; | |
2843 | if (new_offset > rdev->data_offset) | |
2844 | mddev->reshape_backwards = 1; | |
2845 | else if (new_offset < rdev->data_offset) | |
2846 | mddev->reshape_backwards = 0; | |
2847 | ||
2848 | return len; | |
2849 | } | |
2850 | static struct rdev_sysfs_entry rdev_new_offset = | |
2851 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2852 | ||
83303b61 | 2853 | static ssize_t |
3cb03002 | 2854 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2855 | { |
dd8ac336 | 2856 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2857 | } |
2858 | ||
c5d79adb N |
2859 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2860 | { | |
2861 | /* check if two start/length pairs overlap */ | |
2862 | if (s1+l1 <= s2) | |
2863 | return 0; | |
2864 | if (s2+l2 <= s1) | |
2865 | return 0; | |
2866 | return 1; | |
2867 | } | |
2868 | ||
b522adcd DW |
2869 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2870 | { | |
2871 | unsigned long long blocks; | |
2872 | sector_t new; | |
2873 | ||
b29bebd6 | 2874 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
2875 | return -EINVAL; |
2876 | ||
2877 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2878 | return -EINVAL; /* sector conversion overflow */ | |
2879 | ||
2880 | new = blocks * 2; | |
2881 | if (new != blocks * 2) | |
2882 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2883 | ||
2884 | *sectors = new; | |
2885 | return 0; | |
2886 | } | |
2887 | ||
83303b61 | 2888 | static ssize_t |
3cb03002 | 2889 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2890 | { |
fd01b88c | 2891 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2892 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2893 | sector_t sectors; |
27c529bb | 2894 | |
b522adcd | 2895 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2896 | return -EINVAL; |
c6563a8c N |
2897 | if (rdev->data_offset != rdev->new_data_offset) |
2898 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2899 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2900 | if (my_mddev->persistent) { |
dd8ac336 AN |
2901 | sectors = super_types[my_mddev->major_version]. |
2902 | rdev_size_change(rdev, sectors); | |
2903 | if (!sectors) | |
0cd17fec | 2904 | return -EBUSY; |
dd8ac336 | 2905 | } else if (!sectors) |
77304d2a | 2906 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2907 | rdev->data_offset; |
a6468539 N |
2908 | if (!my_mddev->pers->resize) |
2909 | /* Cannot change size for RAID0 or Linear etc */ | |
2910 | return -EINVAL; | |
0cd17fec | 2911 | } |
dd8ac336 | 2912 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2913 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2914 | |
dd8ac336 AN |
2915 | rdev->sectors = sectors; |
2916 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
2917 | /* Need to check that all other rdevs with the same |
2918 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
2919 | * the rdev lists safely. | |
2920 | * This check does not provide a hard guarantee, it | |
2921 | * just helps avoid dangerous mistakes. | |
c5d79adb | 2922 | */ |
fd01b88c | 2923 | struct mddev *mddev; |
c5d79adb | 2924 | int overlap = 0; |
159ec1fc | 2925 | struct list_head *tmp; |
c5d79adb | 2926 | |
8b1afc3d | 2927 | rcu_read_lock(); |
29ac4aa3 | 2928 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2929 | struct md_rdev *rdev2; |
c5d79adb | 2930 | |
dafb20fa | 2931 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
2932 | if (rdev->bdev == rdev2->bdev && |
2933 | rdev != rdev2 && | |
2934 | overlaps(rdev->data_offset, rdev->sectors, | |
2935 | rdev2->data_offset, | |
2936 | rdev2->sectors)) { | |
c5d79adb N |
2937 | overlap = 1; |
2938 | break; | |
2939 | } | |
c5d79adb N |
2940 | if (overlap) { |
2941 | mddev_put(mddev); | |
2942 | break; | |
2943 | } | |
2944 | } | |
8b1afc3d | 2945 | rcu_read_unlock(); |
c5d79adb N |
2946 | if (overlap) { |
2947 | /* Someone else could have slipped in a size | |
2948 | * change here, but doing so is just silly. | |
dd8ac336 | 2949 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2950 | * safe, and trust userspace not to race with |
2951 | * itself | |
2952 | */ | |
dd8ac336 | 2953 | rdev->sectors = oldsectors; |
c5d79adb N |
2954 | return -EBUSY; |
2955 | } | |
2956 | } | |
83303b61 N |
2957 | return len; |
2958 | } | |
2959 | ||
2960 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2961 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2962 | |
3cb03002 | 2963 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
2964 | { |
2965 | unsigned long long recovery_start = rdev->recovery_offset; | |
2966 | ||
2967 | if (test_bit(In_sync, &rdev->flags) || | |
2968 | recovery_start == MaxSector) | |
2969 | return sprintf(page, "none\n"); | |
2970 | ||
2971 | return sprintf(page, "%llu\n", recovery_start); | |
2972 | } | |
2973 | ||
3cb03002 | 2974 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
2975 | { |
2976 | unsigned long long recovery_start; | |
2977 | ||
2978 | if (cmd_match(buf, "none")) | |
2979 | recovery_start = MaxSector; | |
b29bebd6 | 2980 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
2981 | return -EINVAL; |
2982 | ||
2983 | if (rdev->mddev->pers && | |
2984 | rdev->raid_disk >= 0) | |
2985 | return -EBUSY; | |
2986 | ||
2987 | rdev->recovery_offset = recovery_start; | |
2988 | if (recovery_start == MaxSector) | |
2989 | set_bit(In_sync, &rdev->flags); | |
2990 | else | |
2991 | clear_bit(In_sync, &rdev->flags); | |
2992 | return len; | |
2993 | } | |
2994 | ||
2995 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2996 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2997 | ||
16c791a5 N |
2998 | static ssize_t |
2999 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
3000 | static ssize_t | |
3001 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
3002 | ||
3cb03002 | 3003 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3004 | { |
3005 | return badblocks_show(&rdev->badblocks, page, 0); | |
3006 | } | |
3cb03002 | 3007 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 3008 | { |
de393cde N |
3009 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
3010 | /* Maybe that ack was all we needed */ | |
3011 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
3012 | wake_up(&rdev->blocked_wait); | |
3013 | return rv; | |
16c791a5 N |
3014 | } |
3015 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
3016 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
3017 | ||
3cb03002 | 3018 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3019 | { |
3020 | return badblocks_show(&rdev->badblocks, page, 1); | |
3021 | } | |
3cb03002 | 3022 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
3023 | { |
3024 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
3025 | } | |
3026 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
3027 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
3028 | ||
86e6ffdd N |
3029 | static struct attribute *rdev_default_attrs[] = { |
3030 | &rdev_state.attr, | |
4dbcdc75 | 3031 | &rdev_errors.attr, |
014236d2 | 3032 | &rdev_slot.attr, |
93c8cad0 | 3033 | &rdev_offset.attr, |
c6563a8c | 3034 | &rdev_new_offset.attr, |
83303b61 | 3035 | &rdev_size.attr, |
06e3c817 | 3036 | &rdev_recovery_start.attr, |
16c791a5 N |
3037 | &rdev_bad_blocks.attr, |
3038 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
3039 | NULL, |
3040 | }; | |
3041 | static ssize_t | |
3042 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3043 | { | |
3044 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3045 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
86e6ffdd N |
3046 | |
3047 | if (!entry->show) | |
3048 | return -EIO; | |
758bfc8a N |
3049 | if (!rdev->mddev) |
3050 | return -EBUSY; | |
3051 | return entry->show(rdev, page); | |
86e6ffdd N |
3052 | } |
3053 | ||
3054 | static ssize_t | |
3055 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
3056 | const char *page, size_t length) | |
3057 | { | |
3058 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3059 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 3060 | ssize_t rv; |
fd01b88c | 3061 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
3062 | |
3063 | if (!entry->store) | |
3064 | return -EIO; | |
67463acb N |
3065 | if (!capable(CAP_SYS_ADMIN)) |
3066 | return -EACCES; | |
27c529bb | 3067 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 3068 | if (!rv) { |
27c529bb N |
3069 | if (rdev->mddev == NULL) |
3070 | rv = -EBUSY; | |
3071 | else | |
3072 | rv = entry->store(rdev, page, length); | |
6a51830e | 3073 | mddev_unlock(mddev); |
ca388059 N |
3074 | } |
3075 | return rv; | |
86e6ffdd N |
3076 | } |
3077 | ||
3078 | static void rdev_free(struct kobject *ko) | |
3079 | { | |
3cb03002 | 3080 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3081 | kfree(rdev); |
3082 | } | |
52cf25d0 | 3083 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3084 | .show = rdev_attr_show, |
3085 | .store = rdev_attr_store, | |
3086 | }; | |
3087 | static struct kobj_type rdev_ktype = { | |
3088 | .release = rdev_free, | |
3089 | .sysfs_ops = &rdev_sysfs_ops, | |
3090 | .default_attrs = rdev_default_attrs, | |
3091 | }; | |
3092 | ||
3cb03002 | 3093 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3094 | { |
3095 | rdev->desc_nr = -1; | |
3096 | rdev->saved_raid_disk = -1; | |
3097 | rdev->raid_disk = -1; | |
3098 | rdev->flags = 0; | |
3099 | rdev->data_offset = 0; | |
c6563a8c | 3100 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3101 | rdev->sb_events = 0; |
3102 | rdev->last_read_error.tv_sec = 0; | |
3103 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3104 | rdev->sb_loaded = 0; |
3105 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3106 | atomic_set(&rdev->nr_pending, 0); |
3107 | atomic_set(&rdev->read_errors, 0); | |
3108 | atomic_set(&rdev->corrected_errors, 0); | |
3109 | ||
3110 | INIT_LIST_HEAD(&rdev->same_set); | |
3111 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3112 | |
3113 | /* Add space to store bad block list. | |
3114 | * This reserves the space even on arrays where it cannot | |
3115 | * be used - I wonder if that matters | |
3116 | */ | |
3117 | rdev->badblocks.count = 0; | |
486adf72 | 3118 | rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
2230dfe4 N |
3119 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3120 | seqlock_init(&rdev->badblocks.lock); | |
3121 | if (rdev->badblocks.page == NULL) | |
3122 | return -ENOMEM; | |
3123 | ||
3124 | return 0; | |
e8bb9a83 N |
3125 | } |
3126 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3127 | /* |
3128 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3129 | * | |
3130 | * mark the device faulty if: | |
3131 | * | |
3132 | * - the device is nonexistent (zero size) | |
3133 | * - the device has no valid superblock | |
3134 | * | |
3135 | * a faulty rdev _never_ has rdev->sb set. | |
3136 | */ | |
3cb03002 | 3137 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3138 | { |
3139 | char b[BDEVNAME_SIZE]; | |
3140 | int err; | |
3cb03002 | 3141 | struct md_rdev *rdev; |
1da177e4 LT |
3142 | sector_t size; |
3143 | ||
9ffae0cf | 3144 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3145 | if (!rdev) { |
3146 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3147 | return ERR_PTR(-ENOMEM); | |
3148 | } | |
1da177e4 | 3149 | |
2230dfe4 N |
3150 | err = md_rdev_init(rdev); |
3151 | if (err) | |
3152 | goto abort_free; | |
3153 | err = alloc_disk_sb(rdev); | |
3154 | if (err) | |
1da177e4 LT |
3155 | goto abort_free; |
3156 | ||
c5d79adb | 3157 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3158 | if (err) |
3159 | goto abort_free; | |
3160 | ||
f9cb074b | 3161 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3162 | |
77304d2a | 3163 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3164 | if (!size) { |
f72ffdd6 | 3165 | printk(KERN_WARNING |
1da177e4 LT |
3166 | "md: %s has zero or unknown size, marking faulty!\n", |
3167 | bdevname(rdev->bdev,b)); | |
3168 | err = -EINVAL; | |
3169 | goto abort_free; | |
3170 | } | |
3171 | ||
3172 | if (super_format >= 0) { | |
3173 | err = super_types[super_format]. | |
3174 | load_super(rdev, NULL, super_minor); | |
3175 | if (err == -EINVAL) { | |
df968c4e N |
3176 | printk(KERN_WARNING |
3177 | "md: %s does not have a valid v%d.%d " | |
3178 | "superblock, not importing!\n", | |
3179 | bdevname(rdev->bdev,b), | |
3180 | super_format, super_minor); | |
1da177e4 LT |
3181 | goto abort_free; |
3182 | } | |
3183 | if (err < 0) { | |
f72ffdd6 | 3184 | printk(KERN_WARNING |
1da177e4 LT |
3185 | "md: could not read %s's sb, not importing!\n", |
3186 | bdevname(rdev->bdev,b)); | |
3187 | goto abort_free; | |
3188 | } | |
3189 | } | |
6bfe0b49 | 3190 | |
1da177e4 LT |
3191 | return rdev; |
3192 | ||
3193 | abort_free: | |
2699b672 N |
3194 | if (rdev->bdev) |
3195 | unlock_rdev(rdev); | |
545c8795 | 3196 | md_rdev_clear(rdev); |
1da177e4 LT |
3197 | kfree(rdev); |
3198 | return ERR_PTR(err); | |
3199 | } | |
3200 | ||
3201 | /* | |
3202 | * Check a full RAID array for plausibility | |
3203 | */ | |
3204 | ||
f72ffdd6 | 3205 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3206 | { |
3207 | int i; | |
3cb03002 | 3208 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3209 | char b[BDEVNAME_SIZE]; |
3210 | ||
3211 | freshest = NULL; | |
dafb20fa | 3212 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3213 | switch (super_types[mddev->major_version]. |
3214 | load_super(rdev, freshest, mddev->minor_version)) { | |
3215 | case 1: | |
3216 | freshest = rdev; | |
3217 | break; | |
3218 | case 0: | |
3219 | break; | |
3220 | default: | |
3221 | printk( KERN_ERR \ | |
3222 | "md: fatal superblock inconsistency in %s" | |
f72ffdd6 | 3223 | " -- removing from array\n", |
1da177e4 | 3224 | bdevname(rdev->bdev,b)); |
fb56dfef | 3225 | md_kick_rdev_from_array(rdev); |
1da177e4 LT |
3226 | } |
3227 | ||
1da177e4 LT |
3228 | super_types[mddev->major_version]. |
3229 | validate_super(mddev, freshest); | |
3230 | ||
3231 | i = 0; | |
dafb20fa | 3232 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3233 | if (mddev->max_disks && |
3234 | (rdev->desc_nr >= mddev->max_disks || | |
3235 | i > mddev->max_disks)) { | |
de01dfad N |
3236 | printk(KERN_WARNING |
3237 | "md: %s: %s: only %d devices permitted\n", | |
3238 | mdname(mddev), bdevname(rdev->bdev, b), | |
3239 | mddev->max_disks); | |
fb56dfef | 3240 | md_kick_rdev_from_array(rdev); |
de01dfad N |
3241 | continue; |
3242 | } | |
1aee41f6 | 3243 | if (rdev != freshest) { |
1da177e4 LT |
3244 | if (super_types[mddev->major_version]. |
3245 | validate_super(mddev, rdev)) { | |
3246 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3247 | " from array!\n", | |
3248 | bdevname(rdev->bdev,b)); | |
fb56dfef | 3249 | md_kick_rdev_from_array(rdev); |
1da177e4 LT |
3250 | continue; |
3251 | } | |
1aee41f6 | 3252 | } |
1da177e4 LT |
3253 | if (mddev->level == LEVEL_MULTIPATH) { |
3254 | rdev->desc_nr = i++; | |
3255 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3256 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3257 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3258 | rdev->raid_disk = -1; |
3259 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3260 | } |
3261 | } | |
1da177e4 LT |
3262 | } |
3263 | ||
72e02075 N |
3264 | /* Read a fixed-point number. |
3265 | * Numbers in sysfs attributes should be in "standard" units where | |
3266 | * possible, so time should be in seconds. | |
f72ffdd6 | 3267 | * However we internally use a a much smaller unit such as |
72e02075 N |
3268 | * milliseconds or jiffies. |
3269 | * This function takes a decimal number with a possible fractional | |
3270 | * component, and produces an integer which is the result of | |
3271 | * multiplying that number by 10^'scale'. | |
3272 | * all without any floating-point arithmetic. | |
3273 | */ | |
3274 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3275 | { | |
3276 | unsigned long result = 0; | |
3277 | long decimals = -1; | |
3278 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3279 | if (*cp == '.') | |
3280 | decimals = 0; | |
3281 | else if (decimals < scale) { | |
3282 | unsigned int value; | |
3283 | value = *cp - '0'; | |
3284 | result = result * 10 + value; | |
3285 | if (decimals >= 0) | |
3286 | decimals++; | |
3287 | } | |
3288 | cp++; | |
3289 | } | |
3290 | if (*cp == '\n') | |
3291 | cp++; | |
3292 | if (*cp) | |
3293 | return -EINVAL; | |
3294 | if (decimals < 0) | |
3295 | decimals = 0; | |
3296 | while (decimals < scale) { | |
3297 | result *= 10; | |
3298 | decimals ++; | |
3299 | } | |
3300 | *res = result; | |
3301 | return 0; | |
3302 | } | |
3303 | ||
16f17b39 | 3304 | static ssize_t |
fd01b88c | 3305 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3306 | { |
3307 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3308 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3309 | } | |
3310 | static ssize_t | |
fd01b88c | 3311 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3312 | { |
16f17b39 | 3313 | unsigned long msec; |
97ce0a7f | 3314 | |
72e02075 | 3315 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3316 | return -EINVAL; |
16f17b39 N |
3317 | if (msec == 0) |
3318 | mddev->safemode_delay = 0; | |
3319 | else { | |
19052c0e | 3320 | unsigned long old_delay = mddev->safemode_delay; |
1b30e66f N |
3321 | unsigned long new_delay = (msec*HZ)/1000; |
3322 | ||
3323 | if (new_delay == 0) | |
3324 | new_delay = 1; | |
3325 | mddev->safemode_delay = new_delay; | |
3326 | if (new_delay < old_delay || old_delay == 0) | |
3327 | mod_timer(&mddev->safemode_timer, jiffies+1); | |
16f17b39 N |
3328 | } |
3329 | return len; | |
3330 | } | |
3331 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3332 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3333 | |
eae1701f | 3334 | static ssize_t |
fd01b88c | 3335 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3336 | { |
36d091f4 N |
3337 | struct md_personality *p; |
3338 | int ret; | |
3339 | spin_lock(&mddev->lock); | |
3340 | p = mddev->pers; | |
d9d166c2 | 3341 | if (p) |
36d091f4 | 3342 | ret = sprintf(page, "%s\n", p->name); |
d9d166c2 | 3343 | else if (mddev->clevel[0]) |
36d091f4 | 3344 | ret = sprintf(page, "%s\n", mddev->clevel); |
d9d166c2 | 3345 | else if (mddev->level != LEVEL_NONE) |
36d091f4 | 3346 | ret = sprintf(page, "%d\n", mddev->level); |
d9d166c2 | 3347 | else |
36d091f4 N |
3348 | ret = 0; |
3349 | spin_unlock(&mddev->lock); | |
3350 | return ret; | |
eae1701f N |
3351 | } |
3352 | ||
d9d166c2 | 3353 | static ssize_t |
fd01b88c | 3354 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3355 | { |
f2859af6 | 3356 | char clevel[16]; |
6791875e N |
3357 | ssize_t rv; |
3358 | size_t slen = len; | |
db721d32 | 3359 | struct md_personality *pers, *oldpers; |
f2859af6 | 3360 | long level; |
db721d32 | 3361 | void *priv, *oldpriv; |
3cb03002 | 3362 | struct md_rdev *rdev; |
245f46c2 | 3363 | |
6791875e N |
3364 | if (slen == 0 || slen >= sizeof(clevel)) |
3365 | return -EINVAL; | |
3366 | ||
3367 | rv = mddev_lock(mddev); | |
3368 | if (rv) | |
3369 | return rv; | |
3370 | ||
245f46c2 | 3371 | if (mddev->pers == NULL) { |
6791875e N |
3372 | strncpy(mddev->clevel, buf, slen); |
3373 | if (mddev->clevel[slen-1] == '\n') | |
3374 | slen--; | |
3375 | mddev->clevel[slen] = 0; | |
245f46c2 | 3376 | mddev->level = LEVEL_NONE; |
6791875e N |
3377 | rv = len; |
3378 | goto out_unlock; | |
245f46c2 | 3379 | } |
6791875e | 3380 | rv = -EROFS; |
bd8839e0 | 3381 | if (mddev->ro) |
6791875e | 3382 | goto out_unlock; |
245f46c2 N |
3383 | |
3384 | /* request to change the personality. Need to ensure: | |
3385 | * - array is not engaged in resync/recovery/reshape | |
3386 | * - old personality can be suspended | |
3387 | * - new personality will access other array. | |
3388 | */ | |
3389 | ||
6791875e | 3390 | rv = -EBUSY; |
bb4f1e9d | 3391 | if (mddev->sync_thread || |
f851b60d | 3392 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3393 | mddev->reshape_position != MaxSector || |
3394 | mddev->sysfs_active) | |
6791875e | 3395 | goto out_unlock; |
245f46c2 | 3396 | |
6791875e | 3397 | rv = -EINVAL; |
245f46c2 N |
3398 | if (!mddev->pers->quiesce) { |
3399 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3400 | mdname(mddev), mddev->pers->name); | |
6791875e | 3401 | goto out_unlock; |
245f46c2 N |
3402 | } |
3403 | ||
3404 | /* Now find the new personality */ | |
6791875e N |
3405 | strncpy(clevel, buf, slen); |
3406 | if (clevel[slen-1] == '\n') | |
3407 | slen--; | |
3408 | clevel[slen] = 0; | |
b29bebd6 | 3409 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3410 | level = LEVEL_NONE; |
245f46c2 | 3411 | |
f2859af6 DW |
3412 | if (request_module("md-%s", clevel) != 0) |
3413 | request_module("md-level-%s", clevel); | |
245f46c2 | 3414 | spin_lock(&pers_lock); |
f2859af6 | 3415 | pers = find_pers(level, clevel); |
245f46c2 N |
3416 | if (!pers || !try_module_get(pers->owner)) { |
3417 | spin_unlock(&pers_lock); | |
f2859af6 | 3418 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
6791875e N |
3419 | rv = -EINVAL; |
3420 | goto out_unlock; | |
245f46c2 N |
3421 | } |
3422 | spin_unlock(&pers_lock); | |
3423 | ||
3424 | if (pers == mddev->pers) { | |
3425 | /* Nothing to do! */ | |
3426 | module_put(pers->owner); | |
6791875e N |
3427 | rv = len; |
3428 | goto out_unlock; | |
245f46c2 N |
3429 | } |
3430 | if (!pers->takeover) { | |
3431 | module_put(pers->owner); | |
3432 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3433 | mdname(mddev), clevel); |
6791875e N |
3434 | rv = -EINVAL; |
3435 | goto out_unlock; | |
245f46c2 N |
3436 | } |
3437 | ||
dafb20fa | 3438 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3439 | rdev->new_raid_disk = rdev->raid_disk; |
3440 | ||
245f46c2 N |
3441 | /* ->takeover must set new_* and/or delta_disks |
3442 | * if it succeeds, and may set them when it fails. | |
3443 | */ | |
3444 | priv = pers->takeover(mddev); | |
3445 | if (IS_ERR(priv)) { | |
3446 | mddev->new_level = mddev->level; | |
3447 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3448 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3449 | mddev->raid_disks -= mddev->delta_disks; |
3450 | mddev->delta_disks = 0; | |
2c810cdd | 3451 | mddev->reshape_backwards = 0; |
245f46c2 N |
3452 | module_put(pers->owner); |
3453 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3454 | mdname(mddev), clevel); |
6791875e N |
3455 | rv = PTR_ERR(priv); |
3456 | goto out_unlock; | |
245f46c2 N |
3457 | } |
3458 | ||
3459 | /* Looks like we have a winner */ | |
3460 | mddev_suspend(mddev); | |
5aa61f42 | 3461 | mddev_detach(mddev); |
36d091f4 N |
3462 | |
3463 | spin_lock(&mddev->lock); | |
db721d32 N |
3464 | oldpers = mddev->pers; |
3465 | oldpriv = mddev->private; | |
3466 | mddev->pers = pers; | |
3467 | mddev->private = priv; | |
3468 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3469 | mddev->level = mddev->new_level; | |
3470 | mddev->layout = mddev->new_layout; | |
3471 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
3472 | mddev->delta_disks = 0; | |
3473 | mddev->reshape_backwards = 0; | |
3474 | mddev->degraded = 0; | |
36d091f4 | 3475 | spin_unlock(&mddev->lock); |
db721d32 N |
3476 | |
3477 | if (oldpers->sync_request == NULL && | |
3478 | mddev->external) { | |
3479 | /* We are converting from a no-redundancy array | |
3480 | * to a redundancy array and metadata is managed | |
3481 | * externally so we need to be sure that writes | |
3482 | * won't block due to a need to transition | |
3483 | * clean->dirty | |
3484 | * until external management is started. | |
3485 | */ | |
3486 | mddev->in_sync = 0; | |
3487 | mddev->safemode_delay = 0; | |
3488 | mddev->safemode = 0; | |
3489 | } | |
f72ffdd6 | 3490 | |
db721d32 N |
3491 | oldpers->free(mddev, oldpriv); |
3492 | ||
3493 | if (oldpers->sync_request == NULL && | |
a64c876f N |
3494 | pers->sync_request != NULL) { |
3495 | /* need to add the md_redundancy_group */ | |
3496 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3497 | printk(KERN_WARNING | |
3498 | "md: cannot register extra attributes for %s\n", | |
3499 | mdname(mddev)); | |
388975cc | 3500 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3501 | } |
db721d32 | 3502 | if (oldpers->sync_request != NULL && |
a64c876f N |
3503 | pers->sync_request == NULL) { |
3504 | /* need to remove the md_redundancy_group */ | |
3505 | if (mddev->to_remove == NULL) | |
3506 | mddev->to_remove = &md_redundancy_group; | |
3507 | } | |
3508 | ||
dafb20fa | 3509 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3510 | if (rdev->raid_disk < 0) |
3511 | continue; | |
bf2cb0da | 3512 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3513 | rdev->new_raid_disk = -1; |
3514 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3515 | continue; | |
36fad858 | 3516 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3517 | } |
dafb20fa | 3518 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3519 | if (rdev->raid_disk < 0) |
3520 | continue; | |
3521 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3522 | continue; | |
3523 | rdev->raid_disk = rdev->new_raid_disk; | |
3524 | if (rdev->raid_disk < 0) | |
3a981b03 | 3525 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3526 | else { |
36fad858 NK |
3527 | if (sysfs_link_rdev(mddev, rdev)) |
3528 | printk(KERN_WARNING "md: cannot register rd%d" | |
3529 | " for %s after level change\n", | |
3530 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3531 | } |
e93f68a1 N |
3532 | } |
3533 | ||
db721d32 | 3534 | if (pers->sync_request == NULL) { |
9af204cf TM |
3535 | /* this is now an array without redundancy, so |
3536 | * it must always be in_sync | |
3537 | */ | |
3538 | mddev->in_sync = 1; | |
3539 | del_timer_sync(&mddev->safemode_timer); | |
3540 | } | |
02e5f5c0 | 3541 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3542 | pers->run(mddev); |
245f46c2 | 3543 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3544 | mddev_resume(mddev); |
830778a1 N |
3545 | if (!mddev->thread) |
3546 | md_update_sb(mddev, 1); | |
5cac7861 | 3547 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3548 | md_new_event(mddev); |
6791875e N |
3549 | rv = len; |
3550 | out_unlock: | |
3551 | mddev_unlock(mddev); | |
d9d166c2 N |
3552 | return rv; |
3553 | } | |
3554 | ||
3555 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3556 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3557 | |
d4dbd025 | 3558 | static ssize_t |
fd01b88c | 3559 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3560 | { |
3561 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3562 | if (mddev->reshape_position != MaxSector && |
3563 | mddev->layout != mddev->new_layout) | |
3564 | return sprintf(page, "%d (%d)\n", | |
3565 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3566 | return sprintf(page, "%d\n", mddev->layout); |
3567 | } | |
3568 | ||
3569 | static ssize_t | |
fd01b88c | 3570 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 | 3571 | { |
4c9309c0 | 3572 | unsigned int n; |
6791875e | 3573 | int err; |
d4dbd025 | 3574 | |
4c9309c0 AD |
3575 | err = kstrtouint(buf, 10, &n); |
3576 | if (err < 0) | |
3577 | return err; | |
6791875e N |
3578 | err = mddev_lock(mddev); |
3579 | if (err) | |
3580 | return err; | |
d4dbd025 | 3581 | |
b3546035 | 3582 | if (mddev->pers) { |
50ac168a | 3583 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3584 | err = -EBUSY; |
3585 | else if (mddev->ro) | |
3586 | err = -EROFS; | |
3587 | else { | |
3588 | mddev->new_layout = n; | |
3589 | err = mddev->pers->check_reshape(mddev); | |
3590 | if (err) | |
3591 | mddev->new_layout = mddev->layout; | |
597a711b | 3592 | } |
b3546035 | 3593 | } else { |
08a02ecd | 3594 | mddev->new_layout = n; |
b3546035 N |
3595 | if (mddev->reshape_position == MaxSector) |
3596 | mddev->layout = n; | |
3597 | } | |
6791875e N |
3598 | mddev_unlock(mddev); |
3599 | return err ?: len; | |
d4dbd025 N |
3600 | } |
3601 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3602 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3603 | |
eae1701f | 3604 | static ssize_t |
fd01b88c | 3605 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3606 | { |
bb636547 N |
3607 | if (mddev->raid_disks == 0) |
3608 | return 0; | |
08a02ecd N |
3609 | if (mddev->reshape_position != MaxSector && |
3610 | mddev->delta_disks != 0) | |
3611 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3612 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3613 | return sprintf(page, "%d\n", mddev->raid_disks); |
3614 | } | |
3615 | ||
fd01b88c | 3616 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3617 | |
3618 | static ssize_t | |
fd01b88c | 3619 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3620 | { |
4c9309c0 | 3621 | unsigned int n; |
6791875e | 3622 | int err; |
da943b99 | 3623 | |
4c9309c0 AD |
3624 | err = kstrtouint(buf, 10, &n); |
3625 | if (err < 0) | |
3626 | return err; | |
da943b99 | 3627 | |
6791875e N |
3628 | err = mddev_lock(mddev); |
3629 | if (err) | |
3630 | return err; | |
da943b99 | 3631 | if (mddev->pers) |
6791875e | 3632 | err = update_raid_disks(mddev, n); |
08a02ecd | 3633 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3634 | struct md_rdev *rdev; |
08a02ecd | 3635 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c | 3636 | |
6791875e | 3637 | err = -EINVAL; |
c6563a8c N |
3638 | rdev_for_each(rdev, mddev) { |
3639 | if (olddisks < n && | |
3640 | rdev->data_offset < rdev->new_data_offset) | |
6791875e | 3641 | goto out_unlock; |
c6563a8c N |
3642 | if (olddisks > n && |
3643 | rdev->data_offset > rdev->new_data_offset) | |
6791875e | 3644 | goto out_unlock; |
c6563a8c | 3645 | } |
6791875e | 3646 | err = 0; |
08a02ecd N |
3647 | mddev->delta_disks = n - olddisks; |
3648 | mddev->raid_disks = n; | |
2c810cdd | 3649 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3650 | } else |
da943b99 | 3651 | mddev->raid_disks = n; |
6791875e N |
3652 | out_unlock: |
3653 | mddev_unlock(mddev); | |
3654 | return err ? err : len; | |
da943b99 N |
3655 | } |
3656 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3657 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3658 | |
3b34380a | 3659 | static ssize_t |
fd01b88c | 3660 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3661 | { |
08a02ecd | 3662 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3663 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3664 | return sprintf(page, "%d (%d)\n", | |
3665 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3666 | mddev->chunk_sectors << 9); |
3667 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3668 | } |
3669 | ||
3670 | static ssize_t | |
fd01b88c | 3671 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3672 | { |
4c9309c0 | 3673 | unsigned long n; |
6791875e | 3674 | int err; |
3b34380a | 3675 | |
4c9309c0 AD |
3676 | err = kstrtoul(buf, 10, &n); |
3677 | if (err < 0) | |
3678 | return err; | |
3b34380a | 3679 | |
6791875e N |
3680 | err = mddev_lock(mddev); |
3681 | if (err) | |
3682 | return err; | |
b3546035 | 3683 | if (mddev->pers) { |
50ac168a | 3684 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3685 | err = -EBUSY; |
3686 | else if (mddev->ro) | |
3687 | err = -EROFS; | |
3688 | else { | |
3689 | mddev->new_chunk_sectors = n >> 9; | |
3690 | err = mddev->pers->check_reshape(mddev); | |
3691 | if (err) | |
3692 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
597a711b | 3693 | } |
b3546035 | 3694 | } else { |
664e7c41 | 3695 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3696 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3697 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3698 | } |
6791875e N |
3699 | mddev_unlock(mddev); |
3700 | return err ?: len; | |
3b34380a N |
3701 | } |
3702 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3703 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3704 | |
a94213b1 | 3705 | static ssize_t |
fd01b88c | 3706 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3707 | { |
d1a7c503 N |
3708 | if (mddev->recovery_cp == MaxSector) |
3709 | return sprintf(page, "none\n"); | |
a94213b1 N |
3710 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3711 | } | |
3712 | ||
3713 | static ssize_t | |
fd01b88c | 3714 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3715 | { |
4c9309c0 | 3716 | unsigned long long n; |
6791875e | 3717 | int err; |
4c9309c0 AD |
3718 | |
3719 | if (cmd_match(buf, "none")) | |
3720 | n = MaxSector; | |
3721 | else { | |
3722 | err = kstrtoull(buf, 10, &n); | |
3723 | if (err < 0) | |
3724 | return err; | |
3725 | if (n != (sector_t)n) | |
3726 | return -EINVAL; | |
3727 | } | |
a94213b1 | 3728 | |
6791875e N |
3729 | err = mddev_lock(mddev); |
3730 | if (err) | |
3731 | return err; | |
b098636c | 3732 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6791875e | 3733 | err = -EBUSY; |
a94213b1 | 3734 | |
6791875e N |
3735 | if (!err) { |
3736 | mddev->recovery_cp = n; | |
3737 | if (mddev->pers) | |
3738 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3739 | } | |
3740 | mddev_unlock(mddev); | |
3741 | return err ?: len; | |
a94213b1 N |
3742 | } |
3743 | static struct md_sysfs_entry md_resync_start = | |
750f199e N |
3744 | __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, |
3745 | resync_start_show, resync_start_store); | |
a94213b1 | 3746 | |
9e653b63 N |
3747 | /* |
3748 | * The array state can be: | |
3749 | * | |
3750 | * clear | |
3751 | * No devices, no size, no level | |
3752 | * Equivalent to STOP_ARRAY ioctl | |
3753 | * inactive | |
3754 | * May have some settings, but array is not active | |
3755 | * all IO results in error | |
3756 | * When written, doesn't tear down array, but just stops it | |
3757 | * suspended (not supported yet) | |
3758 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3759 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3760 | * readonly |
3761 | * no resync can happen. no superblocks get written. | |
3762 | * write requests fail | |
3763 | * read-auto | |
3764 | * like readonly, but behaves like 'clean' on a write request. | |
3765 | * | |
3766 | * clean - no pending writes, but otherwise active. | |
3767 | * When written to inactive array, starts without resync | |
3768 | * If a write request arrives then | |
3769 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3770 | * if not known, block and switch to write-pending | |
3771 | * If written to an active array that has pending writes, then fails. | |
3772 | * active | |
3773 | * fully active: IO and resync can be happening. | |
3774 | * When written to inactive array, starts with resync | |
3775 | * | |
3776 | * write-pending | |
3777 | * clean, but writes are blocked waiting for 'active' to be written. | |
3778 | * | |
3779 | * active-idle | |
3780 | * like active, but no writes have been seen for a while (100msec). | |
3781 | * | |
3782 | */ | |
3783 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3784 | write_pending, active_idle, bad_word}; | |
05381954 | 3785 | static char *array_states[] = { |
9e653b63 N |
3786 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3787 | "write-pending", "active-idle", NULL }; | |
3788 | ||
3789 | static int match_word(const char *word, char **list) | |
3790 | { | |
3791 | int n; | |
3792 | for (n=0; list[n]; n++) | |
3793 | if (cmd_match(word, list[n])) | |
3794 | break; | |
3795 | return n; | |
3796 | } | |
3797 | ||
3798 | static ssize_t | |
fd01b88c | 3799 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3800 | { |
3801 | enum array_state st = inactive; | |
3802 | ||
3803 | if (mddev->pers) | |
3804 | switch(mddev->ro) { | |
3805 | case 1: | |
3806 | st = readonly; | |
3807 | break; | |
3808 | case 2: | |
3809 | st = read_auto; | |
3810 | break; | |
3811 | case 0: | |
3812 | if (mddev->in_sync) | |
3813 | st = clean; | |
070dc6dd | 3814 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3815 | st = write_pending; |
9e653b63 N |
3816 | else if (mddev->safemode) |
3817 | st = active_idle; | |
3818 | else | |
3819 | st = active; | |
3820 | } | |
3821 | else { | |
3822 | if (list_empty(&mddev->disks) && | |
3823 | mddev->raid_disks == 0 && | |
58c0fed4 | 3824 | mddev->dev_sectors == 0) |
9e653b63 N |
3825 | st = clear; |
3826 | else | |
3827 | st = inactive; | |
3828 | } | |
3829 | return sprintf(page, "%s\n", array_states[st]); | |
3830 | } | |
3831 | ||
f72ffdd6 N |
3832 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
3833 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
3834 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 3835 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
3836 | |
3837 | static ssize_t | |
fd01b88c | 3838 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 | 3839 | { |
6791875e | 3840 | int err; |
9e653b63 | 3841 | enum array_state st = match_word(buf, array_states); |
6791875e N |
3842 | |
3843 | if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { | |
3844 | /* don't take reconfig_mutex when toggling between | |
3845 | * clean and active | |
3846 | */ | |
3847 | spin_lock(&mddev->lock); | |
3848 | if (st == active) { | |
3849 | restart_array(mddev); | |
3850 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3851 | wake_up(&mddev->sb_wait); | |
3852 | err = 0; | |
3853 | } else /* st == clean */ { | |
3854 | restart_array(mddev); | |
3855 | if (atomic_read(&mddev->writes_pending) == 0) { | |
3856 | if (mddev->in_sync == 0) { | |
3857 | mddev->in_sync = 1; | |
3858 | if (mddev->safemode == 1) | |
3859 | mddev->safemode = 0; | |
3860 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3861 | } | |
3862 | err = 0; | |
3863 | } else | |
3864 | err = -EBUSY; | |
3865 | } | |
3866 | spin_unlock(&mddev->lock); | |
c008f1d3 | 3867 | return err ?: len; |
6791875e N |
3868 | } |
3869 | err = mddev_lock(mddev); | |
3870 | if (err) | |
3871 | return err; | |
3872 | err = -EINVAL; | |
9e653b63 N |
3873 | switch(st) { |
3874 | case bad_word: | |
3875 | break; | |
3876 | case clear: | |
3877 | /* stopping an active array */ | |
a05b7ea0 | 3878 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3879 | break; |
3880 | case inactive: | |
3881 | /* stopping an active array */ | |
90cf195d | 3882 | if (mddev->pers) |
a05b7ea0 | 3883 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3884 | else |
e691063a | 3885 | err = 0; /* already inactive */ |
9e653b63 N |
3886 | break; |
3887 | case suspended: | |
3888 | break; /* not supported yet */ | |
3889 | case readonly: | |
3890 | if (mddev->pers) | |
a05b7ea0 | 3891 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3892 | else { |
3893 | mddev->ro = 1; | |
648b629e | 3894 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3895 | err = do_md_run(mddev); |
3896 | } | |
3897 | break; | |
3898 | case read_auto: | |
9e653b63 | 3899 | if (mddev->pers) { |
80268ee9 | 3900 | if (mddev->ro == 0) |
a05b7ea0 | 3901 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3902 | else if (mddev->ro == 1) |
648b629e N |
3903 | err = restart_array(mddev); |
3904 | if (err == 0) { | |
3905 | mddev->ro = 2; | |
3906 | set_disk_ro(mddev->gendisk, 0); | |
3907 | } | |
9e653b63 N |
3908 | } else { |
3909 | mddev->ro = 2; | |
3910 | err = do_md_run(mddev); | |
3911 | } | |
3912 | break; | |
3913 | case clean: | |
3914 | if (mddev->pers) { | |
3915 | restart_array(mddev); | |
85572d7c | 3916 | spin_lock(&mddev->lock); |
9e653b63 | 3917 | if (atomic_read(&mddev->writes_pending) == 0) { |
e691063a N |
3918 | if (mddev->in_sync == 0) { |
3919 | mddev->in_sync = 1; | |
31a59e34 N |
3920 | if (mddev->safemode == 1) |
3921 | mddev->safemode = 0; | |
070dc6dd | 3922 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3923 | } |
3924 | err = 0; | |
3925 | } else | |
3926 | err = -EBUSY; | |
85572d7c | 3927 | spin_unlock(&mddev->lock); |
5bf29597 N |
3928 | } else |
3929 | err = -EINVAL; | |
9e653b63 N |
3930 | break; |
3931 | case active: | |
3932 | if (mddev->pers) { | |
3933 | restart_array(mddev); | |
070dc6dd | 3934 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3935 | wake_up(&mddev->sb_wait); |
3936 | err = 0; | |
3937 | } else { | |
3938 | mddev->ro = 0; | |
648b629e | 3939 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3940 | err = do_md_run(mddev); |
3941 | } | |
3942 | break; | |
3943 | case write_pending: | |
3944 | case active_idle: | |
3945 | /* these cannot be set */ | |
3946 | break; | |
3947 | } | |
6791875e N |
3948 | |
3949 | if (!err) { | |
1d23f178 N |
3950 | if (mddev->hold_active == UNTIL_IOCTL) |
3951 | mddev->hold_active = 0; | |
00bcb4ac | 3952 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 3953 | } |
6791875e N |
3954 | mddev_unlock(mddev); |
3955 | return err ?: len; | |
9e653b63 | 3956 | } |
80ca3a44 | 3957 | static struct md_sysfs_entry md_array_state = |
750f199e | 3958 | __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); |
9e653b63 | 3959 | |
1e50915f | 3960 | static ssize_t |
fd01b88c | 3961 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3962 | return sprintf(page, "%d\n", |
3963 | atomic_read(&mddev->max_corr_read_errors)); | |
3964 | } | |
3965 | ||
3966 | static ssize_t | |
fd01b88c | 3967 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f | 3968 | { |
4c9309c0 AD |
3969 | unsigned int n; |
3970 | int rv; | |
1e50915f | 3971 | |
4c9309c0 AD |
3972 | rv = kstrtouint(buf, 10, &n); |
3973 | if (rv < 0) | |
3974 | return rv; | |
3975 | atomic_set(&mddev->max_corr_read_errors, n); | |
3976 | return len; | |
1e50915f RB |
3977 | } |
3978 | ||
3979 | static struct md_sysfs_entry max_corr_read_errors = | |
3980 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3981 | max_corrected_read_errors_store); | |
3982 | ||
6d7ff738 | 3983 | static ssize_t |
fd01b88c | 3984 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3985 | { |
3986 | return -EINVAL; | |
3987 | } | |
3988 | ||
3989 | static ssize_t | |
fd01b88c | 3990 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
3991 | { |
3992 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3993 | /* The new device is added to the array. | |
3994 | * If the array has a persistent superblock, we read the | |
3995 | * superblock to initialise info and check validity. | |
3996 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3997 | * which mainly checks size. | |
3998 | */ | |
3999 | char *e; | |
4000 | int major = simple_strtoul(buf, &e, 10); | |
4001 | int minor; | |
4002 | dev_t dev; | |
3cb03002 | 4003 | struct md_rdev *rdev; |
6d7ff738 N |
4004 | int err; |
4005 | ||
4006 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
4007 | return -EINVAL; | |
4008 | minor = simple_strtoul(e+1, &e, 10); | |
4009 | if (*e && *e != '\n') | |
4010 | return -EINVAL; | |
4011 | dev = MKDEV(major, minor); | |
4012 | if (major != MAJOR(dev) || | |
4013 | minor != MINOR(dev)) | |
4014 | return -EOVERFLOW; | |
4015 | ||
6791875e N |
4016 | flush_workqueue(md_misc_wq); |
4017 | ||
4018 | err = mddev_lock(mddev); | |
4019 | if (err) | |
4020 | return err; | |
6d7ff738 N |
4021 | if (mddev->persistent) { |
4022 | rdev = md_import_device(dev, mddev->major_version, | |
4023 | mddev->minor_version); | |
4024 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
4025 | struct md_rdev *rdev0 |
4026 | = list_entry(mddev->disks.next, | |
4027 | struct md_rdev, same_set); | |
6d7ff738 N |
4028 | err = super_types[mddev->major_version] |
4029 | .load_super(rdev, rdev0, mddev->minor_version); | |
4030 | if (err < 0) | |
4031 | goto out; | |
4032 | } | |
c5d79adb N |
4033 | } else if (mddev->external) |
4034 | rdev = md_import_device(dev, -2, -1); | |
4035 | else | |
6d7ff738 N |
4036 | rdev = md_import_device(dev, -1, -1); |
4037 | ||
9a8c0fa8 N |
4038 | if (IS_ERR(rdev)) { |
4039 | mddev_unlock(mddev); | |
6d7ff738 | 4040 | return PTR_ERR(rdev); |
9a8c0fa8 | 4041 | } |
6d7ff738 N |
4042 | err = bind_rdev_to_array(rdev, mddev); |
4043 | out: | |
4044 | if (err) | |
4045 | export_rdev(rdev); | |
6791875e | 4046 | mddev_unlock(mddev); |
6d7ff738 N |
4047 | return err ? err : len; |
4048 | } | |
4049 | ||
4050 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 4051 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 4052 | |
9b1d1dac | 4053 | static ssize_t |
fd01b88c | 4054 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
4055 | { |
4056 | char *end; | |
4057 | unsigned long chunk, end_chunk; | |
6791875e | 4058 | int err; |
9b1d1dac | 4059 | |
6791875e N |
4060 | err = mddev_lock(mddev); |
4061 | if (err) | |
4062 | return err; | |
9b1d1dac PC |
4063 | if (!mddev->bitmap) |
4064 | goto out; | |
4065 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
4066 | while (*buf) { | |
4067 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
4068 | if (buf == end) break; | |
4069 | if (*end == '-') { /* range */ | |
4070 | buf = end + 1; | |
4071 | end_chunk = simple_strtoul(buf, &end, 0); | |
4072 | if (buf == end) break; | |
4073 | } | |
4074 | if (*end && !isspace(*end)) break; | |
4075 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 4076 | buf = skip_spaces(end); |
9b1d1dac PC |
4077 | } |
4078 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
4079 | out: | |
6791875e | 4080 | mddev_unlock(mddev); |
9b1d1dac PC |
4081 | return len; |
4082 | } | |
4083 | ||
4084 | static struct md_sysfs_entry md_bitmap = | |
4085 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
4086 | ||
a35b0d69 | 4087 | static ssize_t |
fd01b88c | 4088 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 4089 | { |
58c0fed4 AN |
4090 | return sprintf(page, "%llu\n", |
4091 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
4092 | } |
4093 | ||
fd01b88c | 4094 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
4095 | |
4096 | static ssize_t | |
fd01b88c | 4097 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
4098 | { |
4099 | /* If array is inactive, we can reduce the component size, but | |
4100 | * not increase it (except from 0). | |
4101 | * If array is active, we can try an on-line resize | |
4102 | */ | |
b522adcd DW |
4103 | sector_t sectors; |
4104 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 4105 | |
58c0fed4 AN |
4106 | if (err < 0) |
4107 | return err; | |
6791875e N |
4108 | err = mddev_lock(mddev); |
4109 | if (err) | |
4110 | return err; | |
a35b0d69 | 4111 | if (mddev->pers) { |
58c0fed4 | 4112 | err = update_size(mddev, sectors); |
850b2b42 | 4113 | md_update_sb(mddev, 1); |
a35b0d69 | 4114 | } else { |
58c0fed4 AN |
4115 | if (mddev->dev_sectors == 0 || |
4116 | mddev->dev_sectors > sectors) | |
4117 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
4118 | else |
4119 | err = -ENOSPC; | |
4120 | } | |
6791875e | 4121 | mddev_unlock(mddev); |
a35b0d69 N |
4122 | return err ? err : len; |
4123 | } | |
4124 | ||
4125 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 4126 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 4127 | |
83f0d77a | 4128 | /* Metadata version. |
e691063a N |
4129 | * This is one of |
4130 | * 'none' for arrays with no metadata (good luck...) | |
4131 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
4132 | * or N.M for internally known formats |
4133 | */ | |
4134 | static ssize_t | |
fd01b88c | 4135 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
4136 | { |
4137 | if (mddev->persistent) | |
4138 | return sprintf(page, "%d.%d\n", | |
4139 | mddev->major_version, mddev->minor_version); | |
e691063a N |
4140 | else if (mddev->external) |
4141 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
4142 | else |
4143 | return sprintf(page, "none\n"); | |
4144 | } | |
4145 | ||
4146 | static ssize_t | |
fd01b88c | 4147 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
4148 | { |
4149 | int major, minor; | |
4150 | char *e; | |
6791875e | 4151 | int err; |
ea43ddd8 N |
4152 | /* Changing the details of 'external' metadata is |
4153 | * always permitted. Otherwise there must be | |
4154 | * no devices attached to the array. | |
4155 | */ | |
6791875e N |
4156 | |
4157 | err = mddev_lock(mddev); | |
4158 | if (err) | |
4159 | return err; | |
4160 | err = -EBUSY; | |
ea43ddd8 N |
4161 | if (mddev->external && strncmp(buf, "external:", 9) == 0) |
4162 | ; | |
4163 | else if (!list_empty(&mddev->disks)) | |
6791875e | 4164 | goto out_unlock; |
8bb93aac | 4165 | |
6791875e | 4166 | err = 0; |
8bb93aac N |
4167 | if (cmd_match(buf, "none")) { |
4168 | mddev->persistent = 0; | |
e691063a N |
4169 | mddev->external = 0; |
4170 | mddev->major_version = 0; | |
4171 | mddev->minor_version = 90; | |
6791875e | 4172 | goto out_unlock; |
e691063a N |
4173 | } |
4174 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4175 | size_t namelen = len-9; |
e691063a N |
4176 | if (namelen >= sizeof(mddev->metadata_type)) |
4177 | namelen = sizeof(mddev->metadata_type)-1; | |
4178 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4179 | mddev->metadata_type[namelen] = 0; | |
4180 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4181 | mddev->metadata_type[--namelen] = 0; | |
4182 | mddev->persistent = 0; | |
4183 | mddev->external = 1; | |
8bb93aac N |
4184 | mddev->major_version = 0; |
4185 | mddev->minor_version = 90; | |
6791875e | 4186 | goto out_unlock; |
8bb93aac N |
4187 | } |
4188 | major = simple_strtoul(buf, &e, 10); | |
6791875e | 4189 | err = -EINVAL; |
8bb93aac | 4190 | if (e==buf || *e != '.') |
6791875e | 4191 | goto out_unlock; |
8bb93aac N |
4192 | buf = e+1; |
4193 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4194 | if (e==buf || (*e && *e != '\n') ) |
6791875e N |
4195 | goto out_unlock; |
4196 | err = -ENOENT; | |
50511da3 | 4197 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
6791875e | 4198 | goto out_unlock; |
8bb93aac N |
4199 | mddev->major_version = major; |
4200 | mddev->minor_version = minor; | |
4201 | mddev->persistent = 1; | |
e691063a | 4202 | mddev->external = 0; |
6791875e N |
4203 | err = 0; |
4204 | out_unlock: | |
4205 | mddev_unlock(mddev); | |
4206 | return err ?: len; | |
8bb93aac N |
4207 | } |
4208 | ||
4209 | static struct md_sysfs_entry md_metadata = | |
750f199e | 4210 | __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4211 | |
24dd469d | 4212 | static ssize_t |
fd01b88c | 4213 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4214 | { |
7eec314d | 4215 | char *type = "idle"; |
b7b17c9b N |
4216 | unsigned long recovery = mddev->recovery; |
4217 | if (test_bit(MD_RECOVERY_FROZEN, &recovery)) | |
b6a9ce68 | 4218 | type = "frozen"; |
b7b17c9b N |
4219 | else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || |
4220 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { | |
4221 | if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) | |
ccfcc3c1 | 4222 | type = "reshape"; |
b7b17c9b N |
4223 | else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { |
4224 | if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) | |
24dd469d | 4225 | type = "resync"; |
b7b17c9b | 4226 | else if (test_bit(MD_RECOVERY_CHECK, &recovery)) |
24dd469d N |
4227 | type = "check"; |
4228 | else | |
4229 | type = "repair"; | |
b7b17c9b | 4230 | } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) |
24dd469d | 4231 | type = "recover"; |
985ca973 N |
4232 | else if (mddev->reshape_position != MaxSector) |
4233 | type = "reshape"; | |
24dd469d N |
4234 | } |
4235 | return sprintf(page, "%s\n", type); | |
4236 | } | |
4237 | ||
4238 | static ssize_t | |
fd01b88c | 4239 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4240 | { |
7eec314d N |
4241 | if (!mddev->pers || !mddev->pers->sync_request) |
4242 | return -EINVAL; | |
4243 | ||
b6a9ce68 N |
4244 | |
4245 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
56ccc112 N |
4246 | if (cmd_match(page, "frozen")) |
4247 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4248 | else | |
4249 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
8e8e2518 N |
4250 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4251 | mddev_lock(mddev) == 0) { | |
4252 | flush_workqueue(md_misc_wq); | |
4253 | if (mddev->sync_thread) { | |
4254 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6791875e | 4255 | md_reap_sync_thread(mddev); |
6791875e | 4256 | } |
8e8e2518 | 4257 | mddev_unlock(mddev); |
7eec314d | 4258 | } |
03c902e1 N |
4259 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4260 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4261 | return -EBUSY; |
72a23c21 | 4262 | else if (cmd_match(page, "resync")) |
56ccc112 | 4263 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
72a23c21 | 4264 | else if (cmd_match(page, "recover")) { |
56ccc112 | 4265 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
72a23c21 | 4266 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
72a23c21 | 4267 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4268 | int err; |
4269 | if (mddev->pers->start_reshape == NULL) | |
4270 | return -EINVAL; | |
6791875e N |
4271 | err = mddev_lock(mddev); |
4272 | if (!err) { | |
56ccc112 | 4273 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6791875e N |
4274 | err = mddev->pers->start_reshape(mddev); |
4275 | mddev_unlock(mddev); | |
4276 | } | |
16484bf5 N |
4277 | if (err) |
4278 | return err; | |
a99ac971 | 4279 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4280 | } else { |
bce74dac | 4281 | if (cmd_match(page, "check")) |
7eec314d | 4282 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4283 | else if (!cmd_match(page, "repair")) |
7eec314d | 4284 | return -EINVAL; |
56ccc112 | 4285 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
7eec314d N |
4286 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
4287 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4288 | } |
48c26ddc N |
4289 | if (mddev->ro == 2) { |
4290 | /* A write to sync_action is enough to justify | |
4291 | * canceling read-auto mode | |
4292 | */ | |
4293 | mddev->ro = 0; | |
4294 | md_wakeup_thread(mddev->sync_thread); | |
4295 | } | |
03c902e1 | 4296 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4297 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4298 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4299 | return len; |
4300 | } | |
4301 | ||
c4a39551 | 4302 | static struct md_sysfs_entry md_scan_mode = |
750f199e | 4303 | __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
c4a39551 JB |
4304 | |
4305 | static ssize_t | |
4306 | last_sync_action_show(struct mddev *mddev, char *page) | |
4307 | { | |
4308 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4309 | } | |
4310 | ||
4311 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4312 | ||
9d88883e | 4313 | static ssize_t |
fd01b88c | 4314 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4315 | { |
4316 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4317 | (unsigned long long) |
4318 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4319 | } |
4320 | ||
80ca3a44 | 4321 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4322 | |
88202a0c | 4323 | static ssize_t |
fd01b88c | 4324 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4325 | { |
4326 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4327 | mddev->sync_speed_min ? "local": "system"); | |
4328 | } | |
4329 | ||
4330 | static ssize_t | |
fd01b88c | 4331 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c | 4332 | { |
4c9309c0 AD |
4333 | unsigned int min; |
4334 | int rv; | |
4335 | ||
88202a0c | 4336 | if (strncmp(buf, "system", 6)==0) { |
4c9309c0 AD |
4337 | min = 0; |
4338 | } else { | |
4339 | rv = kstrtouint(buf, 10, &min); | |
4340 | if (rv < 0) | |
4341 | return rv; | |
4342 | if (min == 0) | |
4343 | return -EINVAL; | |
88202a0c | 4344 | } |
88202a0c N |
4345 | mddev->sync_speed_min = min; |
4346 | return len; | |
4347 | } | |
4348 | ||
4349 | static struct md_sysfs_entry md_sync_min = | |
4350 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4351 | ||
4352 | static ssize_t | |
fd01b88c | 4353 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4354 | { |
4355 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4356 | mddev->sync_speed_max ? "local": "system"); | |
4357 | } | |
4358 | ||
4359 | static ssize_t | |
fd01b88c | 4360 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c | 4361 | { |
4c9309c0 AD |
4362 | unsigned int max; |
4363 | int rv; | |
4364 | ||
88202a0c | 4365 | if (strncmp(buf, "system", 6)==0) { |
4c9309c0 AD |
4366 | max = 0; |
4367 | } else { | |
4368 | rv = kstrtouint(buf, 10, &max); | |
4369 | if (rv < 0) | |
4370 | return rv; | |
4371 | if (max == 0) | |
4372 | return -EINVAL; | |
88202a0c | 4373 | } |
88202a0c N |
4374 | mddev->sync_speed_max = max; |
4375 | return len; | |
4376 | } | |
4377 | ||
4378 | static struct md_sysfs_entry md_sync_max = | |
4379 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4380 | ||
d7f3d291 | 4381 | static ssize_t |
fd01b88c | 4382 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4383 | { |
4384 | return sprintf(page, "%d\n", mddev->degraded); | |
4385 | } | |
4386 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4387 | |
90b08710 | 4388 | static ssize_t |
fd01b88c | 4389 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4390 | { |
4391 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4392 | } | |
4393 | ||
4394 | static ssize_t | |
fd01b88c | 4395 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4396 | { |
4397 | long n; | |
4398 | ||
b29bebd6 | 4399 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4400 | return -EINVAL; |
4401 | ||
4402 | if (n != 0 && n != 1) | |
4403 | return -EINVAL; | |
4404 | ||
4405 | mddev->parallel_resync = n; | |
4406 | ||
4407 | if (mddev->sync_thread) | |
4408 | wake_up(&resync_wait); | |
4409 | ||
4410 | return len; | |
4411 | } | |
4412 | ||
4413 | /* force parallel resync, even with shared block devices */ | |
4414 | static struct md_sysfs_entry md_sync_force_parallel = | |
4415 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4416 | sync_force_parallel_show, sync_force_parallel_store); | |
4417 | ||
88202a0c | 4418 | static ssize_t |
fd01b88c | 4419 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4420 | { |
4421 | unsigned long resync, dt, db; | |
d1a7c503 N |
4422 | if (mddev->curr_resync == 0) |
4423 | return sprintf(page, "none\n"); | |
9687a60c AN |
4424 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4425 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4426 | if (!dt) dt++; |
9687a60c AN |
4427 | db = resync - mddev->resync_mark_cnt; |
4428 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4429 | } |
4430 | ||
80ca3a44 | 4431 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4432 | |
4433 | static ssize_t | |
fd01b88c | 4434 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4435 | { |
13ae864b | 4436 | unsigned long long max_sectors, resync; |
88202a0c | 4437 | |
acb180b0 N |
4438 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4439 | return sprintf(page, "none\n"); | |
4440 | ||
72f36d59 N |
4441 | if (mddev->curr_resync == 1 || |
4442 | mddev->curr_resync == 2) | |
4443 | return sprintf(page, "delayed\n"); | |
4444 | ||
c804cdec N |
4445 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4446 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4447 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4448 | else |
58c0fed4 | 4449 | max_sectors = mddev->dev_sectors; |
88202a0c | 4450 | |
acb180b0 | 4451 | resync = mddev->curr_resync_completed; |
13ae864b | 4452 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4453 | } |
4454 | ||
750f199e N |
4455 | static struct md_sysfs_entry md_sync_completed = |
4456 | __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); | |
88202a0c | 4457 | |
5e96ee65 | 4458 | static ssize_t |
fd01b88c | 4459 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4460 | { |
4461 | return sprintf(page, "%llu\n", | |
4462 | (unsigned long long)mddev->resync_min); | |
4463 | } | |
4464 | static ssize_t | |
fd01b88c | 4465 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4466 | { |
4467 | unsigned long long min; | |
23da422b | 4468 | int err; |
23da422b | 4469 | |
b29bebd6 | 4470 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 | 4471 | return -EINVAL; |
23da422b N |
4472 | |
4473 | spin_lock(&mddev->lock); | |
4474 | err = -EINVAL; | |
5e96ee65 | 4475 | if (min > mddev->resync_max) |
23da422b N |
4476 | goto out_unlock; |
4477 | ||
4478 | err = -EBUSY; | |
5e96ee65 | 4479 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4480 | goto out_unlock; |
5e96ee65 | 4481 | |
50c37b13 N |
4482 | /* Round down to multiple of 4K for safety */ |
4483 | mddev->resync_min = round_down(min, 8); | |
23da422b | 4484 | err = 0; |
5e96ee65 | 4485 | |
23da422b N |
4486 | out_unlock: |
4487 | spin_unlock(&mddev->lock); | |
4488 | return err ?: len; | |
5e96ee65 NB |
4489 | } |
4490 | ||
4491 | static struct md_sysfs_entry md_min_sync = | |
4492 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4493 | ||
c6207277 | 4494 | static ssize_t |
fd01b88c | 4495 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4496 | { |
4497 | if (mddev->resync_max == MaxSector) | |
4498 | return sprintf(page, "max\n"); | |
4499 | else | |
4500 | return sprintf(page, "%llu\n", | |
4501 | (unsigned long long)mddev->resync_max); | |
4502 | } | |
4503 | static ssize_t | |
fd01b88c | 4504 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 | 4505 | { |
23da422b N |
4506 | int err; |
4507 | spin_lock(&mddev->lock); | |
c6207277 N |
4508 | if (strncmp(buf, "max", 3) == 0) |
4509 | mddev->resync_max = MaxSector; | |
4510 | else { | |
5e96ee65 | 4511 | unsigned long long max; |
23da422b N |
4512 | int chunk; |
4513 | ||
4514 | err = -EINVAL; | |
b29bebd6 | 4515 | if (kstrtoull(buf, 10, &max)) |
23da422b | 4516 | goto out_unlock; |
5e96ee65 | 4517 | if (max < mddev->resync_min) |
23da422b N |
4518 | goto out_unlock; |
4519 | ||
4520 | err = -EBUSY; | |
c6207277 | 4521 | if (max < mddev->resync_max && |
4d484a4a | 4522 | mddev->ro == 0 && |
c6207277 | 4523 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4524 | goto out_unlock; |
c6207277 N |
4525 | |
4526 | /* Must be a multiple of chunk_size */ | |
23da422b N |
4527 | chunk = mddev->chunk_sectors; |
4528 | if (chunk) { | |
2ac06c33 | 4529 | sector_t temp = max; |
23da422b N |
4530 | |
4531 | err = -EINVAL; | |
4532 | if (sector_div(temp, chunk)) | |
4533 | goto out_unlock; | |
c6207277 N |
4534 | } |
4535 | mddev->resync_max = max; | |
4536 | } | |
4537 | wake_up(&mddev->recovery_wait); | |
23da422b N |
4538 | err = 0; |
4539 | out_unlock: | |
4540 | spin_unlock(&mddev->lock); | |
4541 | return err ?: len; | |
c6207277 N |
4542 | } |
4543 | ||
4544 | static struct md_sysfs_entry md_max_sync = | |
4545 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4546 | ||
e464eafd | 4547 | static ssize_t |
fd01b88c | 4548 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4549 | { |
4550 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4551 | } | |
4552 | ||
4553 | static ssize_t | |
fd01b88c | 4554 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd | 4555 | { |
4c9309c0 | 4556 | unsigned long long old, new; |
6791875e | 4557 | int err; |
e464eafd | 4558 | |
4c9309c0 AD |
4559 | err = kstrtoull(buf, 10, &new); |
4560 | if (err < 0) | |
4561 | return err; | |
4562 | if (new != (sector_t)new) | |
e464eafd | 4563 | return -EINVAL; |
23ddff37 | 4564 | |
6791875e N |
4565 | err = mddev_lock(mddev); |
4566 | if (err) | |
4567 | return err; | |
4568 | err = -EINVAL; | |
4569 | if (mddev->pers == NULL || | |
4570 | mddev->pers->quiesce == NULL) | |
4571 | goto unlock; | |
4572 | old = mddev->suspend_lo; | |
23ddff37 N |
4573 | mddev->suspend_lo = new; |
4574 | if (new >= old) | |
4575 | /* Shrinking suspended region */ | |
e464eafd | 4576 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4577 | else { |
4578 | /* Expanding suspended region - need to wait */ | |
4579 | mddev->pers->quiesce(mddev, 1); | |
4580 | mddev->pers->quiesce(mddev, 0); | |
4581 | } | |
6791875e N |
4582 | err = 0; |
4583 | unlock: | |
4584 | mddev_unlock(mddev); | |
4585 | return err ?: len; | |
e464eafd N |
4586 | } |
4587 | static struct md_sysfs_entry md_suspend_lo = | |
4588 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4589 | ||
e464eafd | 4590 | static ssize_t |
fd01b88c | 4591 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4592 | { |
4593 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4594 | } | |
4595 | ||
4596 | static ssize_t | |
fd01b88c | 4597 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd | 4598 | { |
4c9309c0 | 4599 | unsigned long long old, new; |
6791875e | 4600 | int err; |
e464eafd | 4601 | |
4c9309c0 AD |
4602 | err = kstrtoull(buf, 10, &new); |
4603 | if (err < 0) | |
4604 | return err; | |
4605 | if (new != (sector_t)new) | |
e464eafd | 4606 | return -EINVAL; |
23ddff37 | 4607 | |
6791875e N |
4608 | err = mddev_lock(mddev); |
4609 | if (err) | |
4610 | return err; | |
4611 | err = -EINVAL; | |
4612 | if (mddev->pers == NULL || | |
4613 | mddev->pers->quiesce == NULL) | |
4614 | goto unlock; | |
4615 | old = mddev->suspend_hi; | |
23ddff37 N |
4616 | mddev->suspend_hi = new; |
4617 | if (new <= old) | |
4618 | /* Shrinking suspended region */ | |
4619 | mddev->pers->quiesce(mddev, 2); | |
4620 | else { | |
4621 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4622 | mddev->pers->quiesce(mddev, 1); |
4623 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 | 4624 | } |
6791875e N |
4625 | err = 0; |
4626 | unlock: | |
4627 | mddev_unlock(mddev); | |
4628 | return err ?: len; | |
e464eafd N |
4629 | } |
4630 | static struct md_sysfs_entry md_suspend_hi = | |
4631 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4632 | ||
08a02ecd | 4633 | static ssize_t |
fd01b88c | 4634 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4635 | { |
4636 | if (mddev->reshape_position != MaxSector) | |
4637 | return sprintf(page, "%llu\n", | |
4638 | (unsigned long long)mddev->reshape_position); | |
4639 | strcpy(page, "none\n"); | |
4640 | return 5; | |
4641 | } | |
4642 | ||
4643 | static ssize_t | |
fd01b88c | 4644 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4645 | { |
c6563a8c | 4646 | struct md_rdev *rdev; |
4c9309c0 | 4647 | unsigned long long new; |
6791875e | 4648 | int err; |
6791875e | 4649 | |
4c9309c0 AD |
4650 | err = kstrtoull(buf, 10, &new); |
4651 | if (err < 0) | |
4652 | return err; | |
4653 | if (new != (sector_t)new) | |
08a02ecd | 4654 | return -EINVAL; |
6791875e N |
4655 | err = mddev_lock(mddev); |
4656 | if (err) | |
4657 | return err; | |
4658 | err = -EBUSY; | |
4659 | if (mddev->pers) | |
4660 | goto unlock; | |
08a02ecd N |
4661 | mddev->reshape_position = new; |
4662 | mddev->delta_disks = 0; | |
2c810cdd | 4663 | mddev->reshape_backwards = 0; |
08a02ecd N |
4664 | mddev->new_level = mddev->level; |
4665 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4666 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4667 | rdev_for_each(rdev, mddev) |
4668 | rdev->new_data_offset = rdev->data_offset; | |
6791875e N |
4669 | err = 0; |
4670 | unlock: | |
4671 | mddev_unlock(mddev); | |
4672 | return err ?: len; | |
08a02ecd N |
4673 | } |
4674 | ||
4675 | static struct md_sysfs_entry md_reshape_position = | |
4676 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4677 | reshape_position_store); | |
4678 | ||
2c810cdd N |
4679 | static ssize_t |
4680 | reshape_direction_show(struct mddev *mddev, char *page) | |
4681 | { | |
4682 | return sprintf(page, "%s\n", | |
4683 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4684 | } | |
4685 | ||
4686 | static ssize_t | |
4687 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4688 | { | |
4689 | int backwards = 0; | |
6791875e N |
4690 | int err; |
4691 | ||
2c810cdd N |
4692 | if (cmd_match(buf, "forwards")) |
4693 | backwards = 0; | |
4694 | else if (cmd_match(buf, "backwards")) | |
4695 | backwards = 1; | |
4696 | else | |
4697 | return -EINVAL; | |
4698 | if (mddev->reshape_backwards == backwards) | |
4699 | return len; | |
4700 | ||
6791875e N |
4701 | err = mddev_lock(mddev); |
4702 | if (err) | |
4703 | return err; | |
2c810cdd N |
4704 | /* check if we are allowed to change */ |
4705 | if (mddev->delta_disks) | |
6791875e N |
4706 | err = -EBUSY; |
4707 | else if (mddev->persistent && | |
2c810cdd | 4708 | mddev->major_version == 0) |
6791875e N |
4709 | err = -EINVAL; |
4710 | else | |
4711 | mddev->reshape_backwards = backwards; | |
4712 | mddev_unlock(mddev); | |
4713 | return err ?: len; | |
2c810cdd N |
4714 | } |
4715 | ||
4716 | static struct md_sysfs_entry md_reshape_direction = | |
4717 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4718 | reshape_direction_store); | |
4719 | ||
b522adcd | 4720 | static ssize_t |
fd01b88c | 4721 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4722 | { |
4723 | if (mddev->external_size) | |
4724 | return sprintf(page, "%llu\n", | |
4725 | (unsigned long long)mddev->array_sectors/2); | |
4726 | else | |
4727 | return sprintf(page, "default\n"); | |
4728 | } | |
4729 | ||
4730 | static ssize_t | |
fd01b88c | 4731 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4732 | { |
4733 | sector_t sectors; | |
6791875e N |
4734 | int err; |
4735 | ||
4736 | err = mddev_lock(mddev); | |
4737 | if (err) | |
4738 | return err; | |
b522adcd DW |
4739 | |
4740 | if (strncmp(buf, "default", 7) == 0) { | |
4741 | if (mddev->pers) | |
4742 | sectors = mddev->pers->size(mddev, 0, 0); | |
4743 | else | |
4744 | sectors = mddev->array_sectors; | |
4745 | ||
4746 | mddev->external_size = 0; | |
4747 | } else { | |
4748 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
6791875e N |
4749 | err = -EINVAL; |
4750 | else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
4751 | err = -E2BIG; | |
4752 | else | |
4753 | mddev->external_size = 1; | |
b522adcd DW |
4754 | } |
4755 | ||
6791875e N |
4756 | if (!err) { |
4757 | mddev->array_sectors = sectors; | |
4758 | if (mddev->pers) { | |
4759 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
4760 | revalidate_disk(mddev->gendisk); | |
4761 | } | |
cbe6ef1d | 4762 | } |
6791875e N |
4763 | mddev_unlock(mddev); |
4764 | return err ?: len; | |
b522adcd DW |
4765 | } |
4766 | ||
4767 | static struct md_sysfs_entry md_array_size = | |
4768 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4769 | array_size_store); | |
e464eafd | 4770 | |
eae1701f N |
4771 | static struct attribute *md_default_attrs[] = { |
4772 | &md_level.attr, | |
d4dbd025 | 4773 | &md_layout.attr, |
eae1701f | 4774 | &md_raid_disks.attr, |
3b34380a | 4775 | &md_chunk_size.attr, |
a35b0d69 | 4776 | &md_size.attr, |
a94213b1 | 4777 | &md_resync_start.attr, |
8bb93aac | 4778 | &md_metadata.attr, |
6d7ff738 | 4779 | &md_new_device.attr, |
16f17b39 | 4780 | &md_safe_delay.attr, |
9e653b63 | 4781 | &md_array_state.attr, |
08a02ecd | 4782 | &md_reshape_position.attr, |
2c810cdd | 4783 | &md_reshape_direction.attr, |
b522adcd | 4784 | &md_array_size.attr, |
1e50915f | 4785 | &max_corr_read_errors.attr, |
411036fa N |
4786 | NULL, |
4787 | }; | |
4788 | ||
4789 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4790 | &md_scan_mode.attr, |
c4a39551 | 4791 | &md_last_scan_mode.attr, |
9d88883e | 4792 | &md_mismatches.attr, |
88202a0c N |
4793 | &md_sync_min.attr, |
4794 | &md_sync_max.attr, | |
4795 | &md_sync_speed.attr, | |
90b08710 | 4796 | &md_sync_force_parallel.attr, |
88202a0c | 4797 | &md_sync_completed.attr, |
5e96ee65 | 4798 | &md_min_sync.attr, |
c6207277 | 4799 | &md_max_sync.attr, |
e464eafd N |
4800 | &md_suspend_lo.attr, |
4801 | &md_suspend_hi.attr, | |
9b1d1dac | 4802 | &md_bitmap.attr, |
d7f3d291 | 4803 | &md_degraded.attr, |
eae1701f N |
4804 | NULL, |
4805 | }; | |
411036fa N |
4806 | static struct attribute_group md_redundancy_group = { |
4807 | .name = NULL, | |
4808 | .attrs = md_redundancy_attrs, | |
4809 | }; | |
4810 | ||
eae1701f N |
4811 | static ssize_t |
4812 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4813 | { | |
4814 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4815 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4816 | ssize_t rv; |
eae1701f N |
4817 | |
4818 | if (!entry->show) | |
4819 | return -EIO; | |
af8a2434 N |
4820 | spin_lock(&all_mddevs_lock); |
4821 | if (list_empty(&mddev->all_mddevs)) { | |
4822 | spin_unlock(&all_mddevs_lock); | |
4823 | return -EBUSY; | |
4824 | } | |
4825 | mddev_get(mddev); | |
4826 | spin_unlock(&all_mddevs_lock); | |
4827 | ||
b7b17c9b | 4828 | rv = entry->show(mddev, page); |
af8a2434 | 4829 | mddev_put(mddev); |
96de1e66 | 4830 | return rv; |
eae1701f N |
4831 | } |
4832 | ||
4833 | static ssize_t | |
4834 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4835 | const char *page, size_t length) | |
4836 | { | |
4837 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4838 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4839 | ssize_t rv; |
eae1701f N |
4840 | |
4841 | if (!entry->store) | |
4842 | return -EIO; | |
67463acb N |
4843 | if (!capable(CAP_SYS_ADMIN)) |
4844 | return -EACCES; | |
af8a2434 N |
4845 | spin_lock(&all_mddevs_lock); |
4846 | if (list_empty(&mddev->all_mddevs)) { | |
4847 | spin_unlock(&all_mddevs_lock); | |
4848 | return -EBUSY; | |
4849 | } | |
4850 | mddev_get(mddev); | |
4851 | spin_unlock(&all_mddevs_lock); | |
6791875e | 4852 | rv = entry->store(mddev, page, length); |
af8a2434 | 4853 | mddev_put(mddev); |
96de1e66 | 4854 | return rv; |
eae1701f N |
4855 | } |
4856 | ||
4857 | static void md_free(struct kobject *ko) | |
4858 | { | |
fd01b88c | 4859 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4860 | |
4861 | if (mddev->sysfs_state) | |
4862 | sysfs_put(mddev->sysfs_state); | |
4863 | ||
6cd18e71 N |
4864 | if (mddev->queue) |
4865 | blk_cleanup_queue(mddev->queue); | |
a21d1504 N |
4866 | if (mddev->gendisk) { |
4867 | del_gendisk(mddev->gendisk); | |
4868 | put_disk(mddev->gendisk); | |
4869 | } | |
a21d1504 | 4870 | |
eae1701f N |
4871 | kfree(mddev); |
4872 | } | |
4873 | ||
52cf25d0 | 4874 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4875 | .show = md_attr_show, |
4876 | .store = md_attr_store, | |
4877 | }; | |
4878 | static struct kobj_type md_ktype = { | |
4879 | .release = md_free, | |
4880 | .sysfs_ops = &md_sysfs_ops, | |
4881 | .default_attrs = md_default_attrs, | |
4882 | }; | |
4883 | ||
1da177e4 LT |
4884 | int mdp_major = 0; |
4885 | ||
5fd3a17e DW |
4886 | static void mddev_delayed_delete(struct work_struct *ws) |
4887 | { | |
fd01b88c | 4888 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4889 | |
43a70507 | 4890 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4891 | kobject_del(&mddev->kobj); |
4892 | kobject_put(&mddev->kobj); | |
4893 | } | |
4894 | ||
efeb53c0 | 4895 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4896 | { |
48c9c27b | 4897 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4898 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4899 | struct gendisk *disk; |
efeb53c0 N |
4900 | int partitioned; |
4901 | int shift; | |
4902 | int unit; | |
3830c62f | 4903 | int error; |
1da177e4 LT |
4904 | |
4905 | if (!mddev) | |
efeb53c0 N |
4906 | return -ENODEV; |
4907 | ||
4908 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4909 | shift = partitioned ? MdpMinorShift : 0; | |
4910 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4911 | |
e804ac78 TH |
4912 | /* wait for any previous instance of this device to be |
4913 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4914 | */ |
e804ac78 | 4915 | flush_workqueue(md_misc_wq); |
d3374825 | 4916 | |
48c9c27b | 4917 | mutex_lock(&disks_mutex); |
0909dc44 N |
4918 | error = -EEXIST; |
4919 | if (mddev->gendisk) | |
4920 | goto abort; | |
efeb53c0 N |
4921 | |
4922 | if (name) { | |
4923 | /* Need to ensure that 'name' is not a duplicate. | |
4924 | */ | |
fd01b88c | 4925 | struct mddev *mddev2; |
efeb53c0 N |
4926 | spin_lock(&all_mddevs_lock); |
4927 | ||
4928 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4929 | if (mddev2->gendisk && | |
4930 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4931 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4932 | goto abort; |
efeb53c0 N |
4933 | } |
4934 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4935 | } |
8b765398 | 4936 | |
0909dc44 | 4937 | error = -ENOMEM; |
8b765398 | 4938 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4939 | if (!mddev->queue) |
4940 | goto abort; | |
409c57f3 N |
4941 | mddev->queue->queuedata = mddev; |
4942 | ||
409c57f3 | 4943 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 4944 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 4945 | |
1da177e4 LT |
4946 | disk = alloc_disk(1 << shift); |
4947 | if (!disk) { | |
8b765398 N |
4948 | blk_cleanup_queue(mddev->queue); |
4949 | mddev->queue = NULL; | |
0909dc44 | 4950 | goto abort; |
1da177e4 | 4951 | } |
efeb53c0 | 4952 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4953 | disk->first_minor = unit << shift; |
efeb53c0 N |
4954 | if (name) |
4955 | strcpy(disk->disk_name, name); | |
4956 | else if (partitioned) | |
1da177e4 | 4957 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4958 | else |
1da177e4 | 4959 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4960 | disk->fops = &md_fops; |
4961 | disk->private_data = mddev; | |
4962 | disk->queue = mddev->queue; | |
b0140891 | 4963 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4964 | /* Allow extended partitions. This makes the |
d3374825 | 4965 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4966 | * remove it now. |
4967 | */ | |
4968 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4969 | mddev->gendisk = disk; |
b0140891 N |
4970 | /* As soon as we call add_disk(), another thread could get |
4971 | * through to md_open, so make sure it doesn't get too far | |
4972 | */ | |
4973 | mutex_lock(&mddev->open_mutex); | |
4974 | add_disk(disk); | |
4975 | ||
ed9e1982 TH |
4976 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4977 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4978 | if (error) { |
4979 | /* This isn't possible, but as kobject_init_and_add is marked | |
4980 | * __must_check, we must do something with the result | |
4981 | */ | |
5e55e2f5 N |
4982 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4983 | disk->disk_name); | |
0909dc44 N |
4984 | error = 0; |
4985 | } | |
00bcb4ac N |
4986 | if (mddev->kobj.sd && |
4987 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4988 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4989 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4990 | abort: |
4991 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4992 | if (!error && mddev->kobj.sd) { |
3830c62f | 4993 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4994 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4995 | } |
d3374825 | 4996 | mddev_put(mddev); |
0909dc44 | 4997 | return error; |
efeb53c0 N |
4998 | } |
4999 | ||
5000 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
5001 | { | |
5002 | md_alloc(dev, NULL); | |
1da177e4 LT |
5003 | return NULL; |
5004 | } | |
5005 | ||
efeb53c0 N |
5006 | static int add_named_array(const char *val, struct kernel_param *kp) |
5007 | { | |
5008 | /* val must be "md_*" where * is not all digits. | |
5009 | * We allocate an array with a large free minor number, and | |
5010 | * set the name to val. val must not already be an active name. | |
5011 | */ | |
5012 | int len = strlen(val); | |
5013 | char buf[DISK_NAME_LEN]; | |
5014 | ||
5015 | while (len && val[len-1] == '\n') | |
5016 | len--; | |
5017 | if (len >= DISK_NAME_LEN) | |
5018 | return -E2BIG; | |
5019 | strlcpy(buf, val, len+1); | |
5020 | if (strncmp(buf, "md_", 3) != 0) | |
5021 | return -EINVAL; | |
5022 | return md_alloc(0, buf); | |
5023 | } | |
5024 | ||
1da177e4 LT |
5025 | static void md_safemode_timeout(unsigned long data) |
5026 | { | |
fd01b88c | 5027 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 5028 | |
0fd62b86 NB |
5029 | if (!atomic_read(&mddev->writes_pending)) { |
5030 | mddev->safemode = 1; | |
5031 | if (mddev->external) | |
00bcb4ac | 5032 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 5033 | } |
1da177e4 LT |
5034 | md_wakeup_thread(mddev->thread); |
5035 | } | |
5036 | ||
6ff8d8ec | 5037 | static int start_dirty_degraded; |
1da177e4 | 5038 | |
fd01b88c | 5039 | int md_run(struct mddev *mddev) |
1da177e4 | 5040 | { |
2604b703 | 5041 | int err; |
3cb03002 | 5042 | struct md_rdev *rdev; |
84fc4b56 | 5043 | struct md_personality *pers; |
1da177e4 | 5044 | |
a757e64c N |
5045 | if (list_empty(&mddev->disks)) |
5046 | /* cannot run an array with no devices.. */ | |
1da177e4 | 5047 | return -EINVAL; |
1da177e4 LT |
5048 | |
5049 | if (mddev->pers) | |
5050 | return -EBUSY; | |
bb4f1e9d N |
5051 | /* Cannot run until previous stop completes properly */ |
5052 | if (mddev->sysfs_active) | |
5053 | return -EBUSY; | |
b6eb127d | 5054 | |
1da177e4 LT |
5055 | /* |
5056 | * Analyze all RAID superblock(s) | |
5057 | */ | |
1ec4a939 N |
5058 | if (!mddev->raid_disks) { |
5059 | if (!mddev->persistent) | |
5060 | return -EINVAL; | |
a757e64c | 5061 | analyze_sbs(mddev); |
1ec4a939 | 5062 | } |
1da177e4 | 5063 | |
d9d166c2 N |
5064 | if (mddev->level != LEVEL_NONE) |
5065 | request_module("md-level-%d", mddev->level); | |
5066 | else if (mddev->clevel[0]) | |
5067 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
5068 | |
5069 | /* | |
5070 | * Drop all container device buffers, from now on | |
5071 | * the only valid external interface is through the md | |
5072 | * device. | |
1da177e4 | 5073 | */ |
dafb20fa | 5074 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 5075 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5076 | continue; |
5077 | sync_blockdev(rdev->bdev); | |
f98393a6 | 5078 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
5079 | |
5080 | /* perform some consistency tests on the device. | |
5081 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 5082 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 5083 | */ |
a6ff7e08 JB |
5084 | if (rdev->meta_bdev) { |
5085 | /* Nothing to check */; | |
5086 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
5087 | if (mddev->dev_sectors && |
5088 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 5089 | > rdev->sb_start) { |
f0d76d70 N |
5090 | printk("md: %s: data overlaps metadata\n", |
5091 | mdname(mddev)); | |
5092 | return -EINVAL; | |
5093 | } | |
5094 | } else { | |
0f420358 | 5095 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
5096 | > rdev->data_offset) { |
5097 | printk("md: %s: metadata overlaps data\n", | |
5098 | mdname(mddev)); | |
5099 | return -EINVAL; | |
5100 | } | |
5101 | } | |
00bcb4ac | 5102 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
5103 | } |
5104 | ||
a167f663 | 5105 | if (mddev->bio_set == NULL) |
395c72a7 | 5106 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 5107 | |
1da177e4 | 5108 | spin_lock(&pers_lock); |
d9d166c2 | 5109 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 5110 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 5111 | spin_unlock(&pers_lock); |
d9d166c2 N |
5112 | if (mddev->level != LEVEL_NONE) |
5113 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
5114 | mddev->level); | |
5115 | else | |
5116 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
5117 | mddev->clevel); | |
1da177e4 LT |
5118 | return -EINVAL; |
5119 | } | |
1da177e4 | 5120 | spin_unlock(&pers_lock); |
34817e8c N |
5121 | if (mddev->level != pers->level) { |
5122 | mddev->level = pers->level; | |
5123 | mddev->new_level = pers->level; | |
5124 | } | |
d9d166c2 | 5125 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 5126 | |
f6705578 | 5127 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 5128 | pers->start_reshape == NULL) { |
f6705578 | 5129 | /* This personality cannot handle reshaping... */ |
f6705578 N |
5130 | module_put(pers->owner); |
5131 | return -EINVAL; | |
5132 | } | |
5133 | ||
7dd5e7c3 N |
5134 | if (pers->sync_request) { |
5135 | /* Warn if this is a potentially silly | |
5136 | * configuration. | |
5137 | */ | |
5138 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5139 | struct md_rdev *rdev2; |
7dd5e7c3 | 5140 | int warned = 0; |
159ec1fc | 5141 | |
dafb20fa N |
5142 | rdev_for_each(rdev, mddev) |
5143 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
5144 | if (rdev < rdev2 && |
5145 | rdev->bdev->bd_contains == | |
5146 | rdev2->bdev->bd_contains) { | |
5147 | printk(KERN_WARNING | |
5148 | "%s: WARNING: %s appears to be" | |
5149 | " on the same physical disk as" | |
5150 | " %s.\n", | |
5151 | mdname(mddev), | |
5152 | bdevname(rdev->bdev,b), | |
5153 | bdevname(rdev2->bdev,b2)); | |
5154 | warned = 1; | |
5155 | } | |
5156 | } | |
159ec1fc | 5157 | |
7dd5e7c3 N |
5158 | if (warned) |
5159 | printk(KERN_WARNING | |
5160 | "True protection against single-disk" | |
5161 | " failure might be compromised.\n"); | |
5162 | } | |
5163 | ||
657390d2 | 5164 | mddev->recovery = 0; |
58c0fed4 AN |
5165 | /* may be over-ridden by personality */ |
5166 | mddev->resync_max_sectors = mddev->dev_sectors; | |
5167 | ||
6ff8d8ec | 5168 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 5169 | |
0f9552b5 | 5170 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
5171 | mddev->ro = 2; /* read-only, but switch on first write */ |
5172 | ||
36d091f4 | 5173 | err = pers->run(mddev); |
13e53df3 AN |
5174 | if (err) |
5175 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
36d091f4 | 5176 | else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { |
b522adcd DW |
5177 | WARN_ONCE(!mddev->external_size, "%s: default size too small," |
5178 | " but 'external_size' not in effect?\n", __func__); | |
5179 | printk(KERN_ERR | |
5180 | "md: invalid array_size %llu > default size %llu\n", | |
5181 | (unsigned long long)mddev->array_sectors / 2, | |
36d091f4 | 5182 | (unsigned long long)pers->size(mddev, 0, 0) / 2); |
b522adcd | 5183 | err = -EINVAL; |
b522adcd | 5184 | } |
36d091f4 | 5185 | if (err == 0 && pers->sync_request && |
ef99bf48 | 5186 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { |
f9209a32 GR |
5187 | struct bitmap *bitmap; |
5188 | ||
5189 | bitmap = bitmap_create(mddev, -1); | |
5190 | if (IS_ERR(bitmap)) { | |
5191 | err = PTR_ERR(bitmap); | |
b15c2e57 N |
5192 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", |
5193 | mdname(mddev), err); | |
f9209a32 GR |
5194 | } else |
5195 | mddev->bitmap = bitmap; | |
5196 | ||
b15c2e57 | 5197 | } |
1da177e4 | 5198 | if (err) { |
5aa61f42 | 5199 | mddev_detach(mddev); |
0c35bd47 N |
5200 | if (mddev->private) |
5201 | pers->free(mddev, mddev->private); | |
bd691922 | 5202 | mddev->private = NULL; |
36d091f4 | 5203 | module_put(pers->owner); |
32a7627c N |
5204 | bitmap_destroy(mddev); |
5205 | return err; | |
1da177e4 | 5206 | } |
5c675f83 N |
5207 | if (mddev->queue) { |
5208 | mddev->queue->backing_dev_info.congested_data = mddev; | |
5209 | mddev->queue->backing_dev_info.congested_fn = md_congested; | |
5210 | } | |
36d091f4 | 5211 | if (pers->sync_request) { |
00bcb4ac N |
5212 | if (mddev->kobj.sd && |
5213 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
5214 | printk(KERN_WARNING |
5215 | "md: cannot register extra attributes for %s\n", | |
5216 | mdname(mddev)); | |
00bcb4ac | 5217 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 5218 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
5219 | mddev->ro = 0; |
5220 | ||
f72ffdd6 | 5221 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
5222 | atomic_set(&mddev->max_corr_read_errors, |
5223 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 | 5224 | mddev->safemode = 0; |
16f17b39 | 5225 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 5226 | mddev->in_sync = 1; |
0ca69886 | 5227 | smp_wmb(); |
36d091f4 N |
5228 | spin_lock(&mddev->lock); |
5229 | mddev->pers = pers; | |
0ca69886 | 5230 | mddev->ready = 1; |
36d091f4 | 5231 | spin_unlock(&mddev->lock); |
dafb20fa | 5232 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5233 | if (rdev->raid_disk >= 0) |
5234 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 5235 | /* failure here is OK */; |
f72ffdd6 | 5236 | |
a4a3d26d N |
5237 | if (mddev->degraded && !mddev->ro) |
5238 | /* This ensures that recovering status is reported immediately | |
5239 | * via sysfs - until a lack of spares is confirmed. | |
5240 | */ | |
5241 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
1da177e4 | 5242 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 5243 | |
7a0a5355 | 5244 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 5245 | md_update_sb(mddev, 0); |
1da177e4 | 5246 | |
d7603b7e | 5247 | md_new_event(mddev); |
00bcb4ac N |
5248 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
5249 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 5250 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
5251 | return 0; |
5252 | } | |
390ee602 | 5253 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 5254 | |
fd01b88c | 5255 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
5256 | { |
5257 | int err; | |
5258 | ||
5259 | err = md_run(mddev); | |
5260 | if (err) | |
5261 | goto out; | |
69e51b44 N |
5262 | err = bitmap_load(mddev); |
5263 | if (err) { | |
5264 | bitmap_destroy(mddev); | |
5265 | goto out; | |
5266 | } | |
0fd018af JB |
5267 | |
5268 | md_wakeup_thread(mddev->thread); | |
5269 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5270 | ||
fe60b014 N |
5271 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5272 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5273 | mddev->changed = 1; |
fe60b014 N |
5274 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5275 | out: | |
5276 | return err; | |
5277 | } | |
5278 | ||
fd01b88c | 5279 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5280 | { |
5281 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5282 | |
80fab1d7 | 5283 | /* Complain if it has no devices */ |
1da177e4 | 5284 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5285 | return -ENXIO; |
5286 | if (!mddev->pers) | |
5287 | return -EINVAL; | |
5288 | if (!mddev->ro) | |
5289 | return -EBUSY; | |
5290 | mddev->safemode = 0; | |
5291 | mddev->ro = 0; | |
5292 | set_disk_ro(disk, 0); | |
5293 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5294 | mdname(mddev)); | |
5295 | /* Kick recovery or resync if necessary */ | |
5296 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5297 | md_wakeup_thread(mddev->thread); | |
5298 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5299 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5300 | return 0; |
1da177e4 LT |
5301 | } |
5302 | ||
fd01b88c | 5303 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5304 | { |
5305 | mddev->array_sectors = 0; | |
5306 | mddev->external_size = 0; | |
5307 | mddev->dev_sectors = 0; | |
5308 | mddev->raid_disks = 0; | |
5309 | mddev->recovery_cp = 0; | |
5310 | mddev->resync_min = 0; | |
5311 | mddev->resync_max = MaxSector; | |
5312 | mddev->reshape_position = MaxSector; | |
5313 | mddev->external = 0; | |
5314 | mddev->persistent = 0; | |
5315 | mddev->level = LEVEL_NONE; | |
5316 | mddev->clevel[0] = 0; | |
5317 | mddev->flags = 0; | |
5318 | mddev->ro = 0; | |
5319 | mddev->metadata_type[0] = 0; | |
5320 | mddev->chunk_sectors = 0; | |
5321 | mddev->ctime = mddev->utime = 0; | |
5322 | mddev->layout = 0; | |
5323 | mddev->max_disks = 0; | |
5324 | mddev->events = 0; | |
a8707c08 | 5325 | mddev->can_decrease_events = 0; |
6177b472 | 5326 | mddev->delta_disks = 0; |
2c810cdd | 5327 | mddev->reshape_backwards = 0; |
6177b472 N |
5328 | mddev->new_level = LEVEL_NONE; |
5329 | mddev->new_layout = 0; | |
5330 | mddev->new_chunk_sectors = 0; | |
5331 | mddev->curr_resync = 0; | |
7f7583d4 | 5332 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5333 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5334 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5335 | mddev->recovery = 0; | |
5336 | mddev->in_sync = 0; | |
f0b4f7e2 | 5337 | mddev->changed = 0; |
6177b472 | 5338 | mddev->degraded = 0; |
6177b472 | 5339 | mddev->safemode = 0; |
bd691922 | 5340 | mddev->private = NULL; |
6177b472 N |
5341 | mddev->bitmap_info.offset = 0; |
5342 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5343 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5344 | mddev->bitmap_info.chunksize = 0; |
5345 | mddev->bitmap_info.daemon_sleep = 0; | |
5346 | mddev->bitmap_info.max_write_behind = 0; | |
5347 | } | |
5348 | ||
fd01b88c | 5349 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5350 | { |
6b6204ee | 5351 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5352 | flush_workqueue(md_misc_wq); |
a047e125 | 5353 | if (mddev->sync_thread) { |
a047e125 | 5354 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5355 | md_reap_sync_thread(mddev); |
a047e125 N |
5356 | } |
5357 | ||
5358 | del_timer_sync(&mddev->safemode_timer); | |
5359 | ||
5360 | bitmap_flush(mddev); | |
5361 | md_super_wait(mddev); | |
5362 | ||
b6d428c6 | 5363 | if (mddev->ro == 0 && |
7a0a5355 | 5364 | (!mddev->in_sync || (mddev->flags & MD_UPDATE_SB_FLAGS))) { |
a047e125 N |
5365 | /* mark array as shutdown cleanly */ |
5366 | mddev->in_sync = 1; | |
5367 | md_update_sb(mddev, 1); | |
5368 | } | |
5369 | } | |
defad61a | 5370 | |
fd01b88c | 5371 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5372 | { |
29f097c4 | 5373 | mddev_lock_nointr(mddev); |
defad61a N |
5374 | __md_stop_writes(mddev); |
5375 | mddev_unlock(mddev); | |
5376 | } | |
390ee602 | 5377 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5378 | |
5aa61f42 N |
5379 | static void mddev_detach(struct mddev *mddev) |
5380 | { | |
5381 | struct bitmap *bitmap = mddev->bitmap; | |
5382 | /* wait for behind writes to complete */ | |
5383 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
5384 | printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n", | |
5385 | mdname(mddev)); | |
5386 | /* need to kick something here to make sure I/O goes? */ | |
5387 | wait_event(bitmap->behind_wait, | |
5388 | atomic_read(&bitmap->behind_writes) == 0); | |
5389 | } | |
36d091f4 | 5390 | if (mddev->pers && mddev->pers->quiesce) { |
5aa61f42 N |
5391 | mddev->pers->quiesce(mddev, 1); |
5392 | mddev->pers->quiesce(mddev, 0); | |
5393 | } | |
5394 | md_unregister_thread(&mddev->thread); | |
5395 | if (mddev->queue) | |
5396 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
5397 | } | |
5398 | ||
5eff3c43 | 5399 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5400 | { |
36d091f4 | 5401 | struct md_personality *pers = mddev->pers; |
5aa61f42 | 5402 | mddev_detach(mddev); |
ee5d004f N |
5403 | /* Ensure ->event_work is done */ |
5404 | flush_workqueue(md_misc_wq); | |
36d091f4 N |
5405 | spin_lock(&mddev->lock); |
5406 | mddev->ready = 0; | |
6177b472 | 5407 | mddev->pers = NULL; |
36d091f4 N |
5408 | spin_unlock(&mddev->lock); |
5409 | pers->free(mddev, mddev->private); | |
bd691922 | 5410 | mddev->private = NULL; |
36d091f4 N |
5411 | if (pers->sync_request && mddev->to_remove == NULL) |
5412 | mddev->to_remove = &md_redundancy_group; | |
5413 | module_put(pers->owner); | |
cca9cf90 | 5414 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5415 | } |
5eff3c43 N |
5416 | |
5417 | void md_stop(struct mddev *mddev) | |
5418 | { | |
5419 | /* stop the array and free an attached data structures. | |
5420 | * This is called from dm-raid | |
5421 | */ | |
5422 | __md_stop(mddev); | |
5423 | bitmap_destroy(mddev); | |
5424 | if (mddev->bio_set) | |
5425 | bioset_free(mddev->bio_set); | |
5426 | } | |
5427 | ||
390ee602 | 5428 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5429 | |
a05b7ea0 | 5430 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5431 | { |
5432 | int err = 0; | |
30b8feb7 N |
5433 | int did_freeze = 0; |
5434 | ||
5435 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5436 | did_freeze = 1; | |
5437 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5438 | md_wakeup_thread(mddev->thread); | |
5439 | } | |
f851b60d | 5440 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5441 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5442 | if (mddev->sync_thread) |
30b8feb7 N |
5443 | /* Thread might be blocked waiting for metadata update |
5444 | * which will now never happen */ | |
5445 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5446 | |
88724bfa N |
5447 | if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
5448 | return -EBUSY; | |
30b8feb7 | 5449 | mddev_unlock(mddev); |
f851b60d N |
5450 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5451 | &mddev->recovery)); | |
88724bfa N |
5452 | wait_event(mddev->sb_wait, |
5453 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
30b8feb7 N |
5454 | mddev_lock_nointr(mddev); |
5455 | ||
a4bd82d0 | 5456 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5457 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5458 | mddev->sync_thread || |
f851b60d | 5459 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5460 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
a4bd82d0 | 5461 | printk("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5462 | if (did_freeze) { |
5463 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5464 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5465 | md_wakeup_thread(mddev->thread); |
5466 | } | |
a4bd82d0 N |
5467 | err = -EBUSY; |
5468 | goto out; | |
5469 | } | |
5470 | if (mddev->pers) { | |
defad61a | 5471 | __md_stop_writes(mddev); |
a4bd82d0 N |
5472 | |
5473 | err = -ENXIO; | |
5474 | if (mddev->ro==1) | |
5475 | goto out; | |
5476 | mddev->ro = 1; | |
5477 | set_disk_ro(mddev->gendisk, 1); | |
5478 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5479 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5480 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5481 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5482 | err = 0; |
a4bd82d0 N |
5483 | } |
5484 | out: | |
5485 | mutex_unlock(&mddev->open_mutex); | |
5486 | return err; | |
5487 | } | |
5488 | ||
9e653b63 N |
5489 | /* mode: |
5490 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5491 | * 2 - stop but do not disassemble array |
5492 | */ | |
f72ffdd6 | 5493 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5494 | struct block_device *bdev) |
1da177e4 | 5495 | { |
1da177e4 | 5496 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5497 | struct md_rdev *rdev; |
30b8feb7 N |
5498 | int did_freeze = 0; |
5499 | ||
5500 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5501 | did_freeze = 1; | |
5502 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5503 | md_wakeup_thread(mddev->thread); | |
5504 | } | |
f851b60d | 5505 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5506 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5507 | if (mddev->sync_thread) |
30b8feb7 N |
5508 | /* Thread might be blocked waiting for metadata update |
5509 | * which will now never happen */ | |
5510 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5511 | |
30b8feb7 | 5512 | mddev_unlock(mddev); |
f851b60d N |
5513 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5514 | !test_bit(MD_RECOVERY_RUNNING, | |
5515 | &mddev->recovery))); | |
30b8feb7 | 5516 | mddev_lock_nointr(mddev); |
1da177e4 | 5517 | |
c8c00a69 | 5518 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5519 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5520 | mddev->sysfs_active || |
5521 | mddev->sync_thread || | |
f851b60d | 5522 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5523 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
df5b20cf | 5524 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5525 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5526 | if (did_freeze) { |
5527 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5528 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5529 | md_wakeup_thread(mddev->thread); |
5530 | } | |
260fa034 N |
5531 | return -EBUSY; |
5532 | } | |
6e17b027 | 5533 | if (mddev->pers) { |
a4bd82d0 N |
5534 | if (mddev->ro) |
5535 | set_disk_ro(disk, 0); | |
409c57f3 | 5536 | |
defad61a | 5537 | __md_stop_writes(mddev); |
5eff3c43 | 5538 | __md_stop(mddev); |
a4bd82d0 | 5539 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5540 | |
a4bd82d0 | 5541 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5542 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5543 | |
dafb20fa | 5544 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5545 | if (rdev->raid_disk >= 0) |
5546 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5547 | |
a4bd82d0 | 5548 | set_capacity(disk, 0); |
6e17b027 | 5549 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5550 | mddev->changed = 1; |
a4bd82d0 | 5551 | revalidate_disk(disk); |
0d4ca600 | 5552 | |
a4bd82d0 N |
5553 | if (mddev->ro) |
5554 | mddev->ro = 0; | |
6e17b027 N |
5555 | } else |
5556 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5557 | /* |
5558 | * Free resources if final stop | |
5559 | */ | |
9e653b63 | 5560 | if (mode == 0) { |
1da177e4 LT |
5561 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5562 | ||
978f946b | 5563 | bitmap_destroy(mddev); |
c3d9714e | 5564 | if (mddev->bitmap_info.file) { |
4af1a041 N |
5565 | struct file *f = mddev->bitmap_info.file; |
5566 | spin_lock(&mddev->lock); | |
c3d9714e | 5567 | mddev->bitmap_info.file = NULL; |
4af1a041 N |
5568 | spin_unlock(&mddev->lock); |
5569 | fput(f); | |
978f946b | 5570 | } |
c3d9714e | 5571 | mddev->bitmap_info.offset = 0; |
978f946b | 5572 | |
1da177e4 LT |
5573 | export_array(mddev); |
5574 | ||
6177b472 | 5575 | md_clean(mddev); |
934d9c23 | 5576 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5577 | if (mddev->hold_active == UNTIL_STOP) |
5578 | mddev->hold_active = 0; | |
a4bd82d0 | 5579 | } |
3f9d99c1 | 5580 | blk_integrity_unregister(disk); |
d7603b7e | 5581 | md_new_event(mddev); |
00bcb4ac | 5582 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5583 | return 0; |
1da177e4 LT |
5584 | } |
5585 | ||
fdee8ae4 | 5586 | #ifndef MODULE |
fd01b88c | 5587 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5588 | { |
3cb03002 | 5589 | struct md_rdev *rdev; |
1da177e4 LT |
5590 | int err; |
5591 | ||
a757e64c | 5592 | if (list_empty(&mddev->disks)) |
1da177e4 | 5593 | return; |
1da177e4 LT |
5594 | |
5595 | printk(KERN_INFO "md: running: "); | |
5596 | ||
dafb20fa | 5597 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5598 | char b[BDEVNAME_SIZE]; |
5599 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5600 | } | |
5601 | printk("\n"); | |
5602 | ||
d710e138 | 5603 | err = do_md_run(mddev); |
1da177e4 LT |
5604 | if (err) { |
5605 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5606 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5607 | } |
5608 | } | |
5609 | ||
5610 | /* | |
5611 | * lets try to run arrays based on all disks that have arrived | |
5612 | * until now. (those are in pending_raid_disks) | |
5613 | * | |
5614 | * the method: pick the first pending disk, collect all disks with | |
5615 | * the same UUID, remove all from the pending list and put them into | |
5616 | * the 'same_array' list. Then order this list based on superblock | |
5617 | * update time (freshest comes first), kick out 'old' disks and | |
5618 | * compare superblocks. If everything's fine then run it. | |
5619 | * | |
5620 | * If "unit" is allocated, then bump its reference count | |
5621 | */ | |
5622 | static void autorun_devices(int part) | |
5623 | { | |
3cb03002 | 5624 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5625 | struct mddev *mddev; |
1da177e4 LT |
5626 | char b[BDEVNAME_SIZE]; |
5627 | ||
5628 | printk(KERN_INFO "md: autorun ...\n"); | |
5629 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5630 | int unit; |
1da177e4 | 5631 | dev_t dev; |
ad01c9e3 | 5632 | LIST_HEAD(candidates); |
1da177e4 | 5633 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5634 | struct md_rdev, same_set); |
1da177e4 LT |
5635 | |
5636 | printk(KERN_INFO "md: considering %s ...\n", | |
5637 | bdevname(rdev0->bdev,b)); | |
5638 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5639 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5640 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5641 | printk(KERN_INFO "md: adding %s ...\n", | |
5642 | bdevname(rdev->bdev,b)); | |
5643 | list_move(&rdev->same_set, &candidates); | |
5644 | } | |
5645 | /* | |
5646 | * now we have a set of devices, with all of them having | |
5647 | * mostly sane superblocks. It's time to allocate the | |
5648 | * mddev. | |
5649 | */ | |
e8703fe1 N |
5650 | if (part) { |
5651 | dev = MKDEV(mdp_major, | |
5652 | rdev0->preferred_minor << MdpMinorShift); | |
5653 | unit = MINOR(dev) >> MdpMinorShift; | |
5654 | } else { | |
5655 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5656 | unit = MINOR(dev); | |
5657 | } | |
5658 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5659 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5660 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5661 | break; | |
5662 | } | |
1da177e4 LT |
5663 | |
5664 | md_probe(dev, NULL, NULL); | |
5665 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5666 | if (!mddev || !mddev->gendisk) { |
5667 | if (mddev) | |
5668 | mddev_put(mddev); | |
5669 | printk(KERN_ERR | |
1da177e4 LT |
5670 | "md: cannot allocate memory for md drive.\n"); |
5671 | break; | |
5672 | } | |
f72ffdd6 | 5673 | if (mddev_lock(mddev)) |
1da177e4 LT |
5674 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
5675 | mdname(mddev)); | |
5676 | else if (mddev->raid_disks || mddev->major_version | |
5677 | || !list_empty(&mddev->disks)) { | |
f72ffdd6 | 5678 | printk(KERN_WARNING |
1da177e4 LT |
5679 | "md: %s already running, cannot run %s\n", |
5680 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5681 | mddev_unlock(mddev); | |
5682 | } else { | |
5683 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5684 | mddev->persistent = 1; |
159ec1fc | 5685 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5686 | list_del_init(&rdev->same_set); |
5687 | if (bind_rdev_to_array(rdev, mddev)) | |
5688 | export_rdev(rdev); | |
5689 | } | |
5690 | autorun_array(mddev); | |
5691 | mddev_unlock(mddev); | |
5692 | } | |
5693 | /* on success, candidates will be empty, on error | |
5694 | * it won't... | |
5695 | */ | |
159ec1fc | 5696 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5697 | list_del_init(&rdev->same_set); |
1da177e4 | 5698 | export_rdev(rdev); |
4b80991c | 5699 | } |
1da177e4 LT |
5700 | mddev_put(mddev); |
5701 | } | |
5702 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5703 | } | |
fdee8ae4 | 5704 | #endif /* !MODULE */ |
1da177e4 | 5705 | |
f72ffdd6 | 5706 | static int get_version(void __user *arg) |
1da177e4 LT |
5707 | { |
5708 | mdu_version_t ver; | |
5709 | ||
5710 | ver.major = MD_MAJOR_VERSION; | |
5711 | ver.minor = MD_MINOR_VERSION; | |
5712 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5713 | ||
5714 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5715 | return -EFAULT; | |
5716 | ||
5717 | return 0; | |
5718 | } | |
5719 | ||
f72ffdd6 | 5720 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
5721 | { |
5722 | mdu_array_info_t info; | |
a9f326eb | 5723 | int nr,working,insync,failed,spare; |
3cb03002 | 5724 | struct md_rdev *rdev; |
1da177e4 | 5725 | |
1ca69c4b N |
5726 | nr = working = insync = failed = spare = 0; |
5727 | rcu_read_lock(); | |
5728 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5729 | nr++; |
b2d444d7 | 5730 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5731 | failed++; |
5732 | else { | |
5733 | working++; | |
b2d444d7 | 5734 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 5735 | insync++; |
1da177e4 LT |
5736 | else |
5737 | spare++; | |
5738 | } | |
5739 | } | |
1ca69c4b | 5740 | rcu_read_unlock(); |
1da177e4 LT |
5741 | |
5742 | info.major_version = mddev->major_version; | |
5743 | info.minor_version = mddev->minor_version; | |
5744 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5745 | info.ctime = mddev->ctime; | |
5746 | info.level = mddev->level; | |
58c0fed4 AN |
5747 | info.size = mddev->dev_sectors / 2; |
5748 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5749 | info.size = -1; |
1da177e4 LT |
5750 | info.nr_disks = nr; |
5751 | info.raid_disks = mddev->raid_disks; | |
5752 | info.md_minor = mddev->md_minor; | |
5753 | info.not_persistent= !mddev->persistent; | |
5754 | ||
5755 | info.utime = mddev->utime; | |
5756 | info.state = 0; | |
5757 | if (mddev->in_sync) | |
5758 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5759 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 5760 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
ca8895d9 GR |
5761 | if (mddev_is_clustered(mddev)) |
5762 | info.state |= (1<<MD_SB_CLUSTERED); | |
a9f326eb | 5763 | info.active_disks = insync; |
1da177e4 LT |
5764 | info.working_disks = working; |
5765 | info.failed_disks = failed; | |
5766 | info.spare_disks = spare; | |
5767 | ||
5768 | info.layout = mddev->layout; | |
9d8f0363 | 5769 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5770 | |
5771 | if (copy_to_user(arg, &info, sizeof(info))) | |
5772 | return -EFAULT; | |
5773 | ||
5774 | return 0; | |
5775 | } | |
5776 | ||
f72ffdd6 | 5777 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
5778 | { |
5779 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
f4ad3d38 | 5780 | char *ptr; |
4af1a041 | 5781 | int err; |
32a7627c | 5782 | |
b6878d9e | 5783 | file = kzalloc(sizeof(*file), GFP_NOIO); |
32a7627c | 5784 | if (!file) |
4af1a041 | 5785 | return -ENOMEM; |
32a7627c | 5786 | |
4af1a041 N |
5787 | err = 0; |
5788 | spin_lock(&mddev->lock); | |
25eafe1a BR |
5789 | /* bitmap enabled */ |
5790 | if (mddev->bitmap_info.file) { | |
5791 | ptr = file_path(mddev->bitmap_info.file, file->pathname, | |
5792 | sizeof(file->pathname)); | |
5793 | if (IS_ERR(ptr)) | |
5794 | err = PTR_ERR(ptr); | |
5795 | else | |
5796 | memmove(file->pathname, ptr, | |
5797 | sizeof(file->pathname)-(ptr-file->pathname)); | |
5798 | } | |
4af1a041 | 5799 | spin_unlock(&mddev->lock); |
32a7627c | 5800 | |
4af1a041 N |
5801 | if (err == 0 && |
5802 | copy_to_user(arg, file, sizeof(*file))) | |
32a7627c | 5803 | err = -EFAULT; |
4af1a041 | 5804 | |
32a7627c N |
5805 | kfree(file); |
5806 | return err; | |
5807 | } | |
5808 | ||
f72ffdd6 | 5809 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
5810 | { |
5811 | mdu_disk_info_t info; | |
3cb03002 | 5812 | struct md_rdev *rdev; |
1da177e4 LT |
5813 | |
5814 | if (copy_from_user(&info, arg, sizeof(info))) | |
5815 | return -EFAULT; | |
5816 | ||
1ca69c4b | 5817 | rcu_read_lock(); |
57d051dc | 5818 | rdev = md_find_rdev_nr_rcu(mddev, info.number); |
1da177e4 LT |
5819 | if (rdev) { |
5820 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5821 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5822 | info.raid_disk = rdev->raid_disk; | |
5823 | info.state = 0; | |
b2d444d7 | 5824 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5825 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5826 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5827 | info.state |= (1<<MD_DISK_ACTIVE); |
5828 | info.state |= (1<<MD_DISK_SYNC); | |
5829 | } | |
8ddf9efe N |
5830 | if (test_bit(WriteMostly, &rdev->flags)) |
5831 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5832 | } else { |
5833 | info.major = info.minor = 0; | |
5834 | info.raid_disk = -1; | |
5835 | info.state = (1<<MD_DISK_REMOVED); | |
5836 | } | |
1ca69c4b | 5837 | rcu_read_unlock(); |
1da177e4 LT |
5838 | |
5839 | if (copy_to_user(arg, &info, sizeof(info))) | |
5840 | return -EFAULT; | |
5841 | ||
5842 | return 0; | |
5843 | } | |
5844 | ||
f72ffdd6 | 5845 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5846 | { |
5847 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5848 | struct md_rdev *rdev; |
1da177e4 LT |
5849 | dev_t dev = MKDEV(info->major,info->minor); |
5850 | ||
1aee41f6 GR |
5851 | if (mddev_is_clustered(mddev) && |
5852 | !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { | |
fa8259da | 5853 | pr_err("%s: Cannot add to clustered mddev.\n", |
1aee41f6 GR |
5854 | mdname(mddev)); |
5855 | return -EINVAL; | |
5856 | } | |
5857 | ||
1da177e4 LT |
5858 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) |
5859 | return -EOVERFLOW; | |
5860 | ||
5861 | if (!mddev->raid_disks) { | |
5862 | int err; | |
5863 | /* expecting a device which has a superblock */ | |
5864 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5865 | if (IS_ERR(rdev)) { | |
f72ffdd6 | 5866 | printk(KERN_WARNING |
1da177e4 LT |
5867 | "md: md_import_device returned %ld\n", |
5868 | PTR_ERR(rdev)); | |
5869 | return PTR_ERR(rdev); | |
5870 | } | |
5871 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5872 | struct md_rdev *rdev0 |
5873 | = list_entry(mddev->disks.next, | |
5874 | struct md_rdev, same_set); | |
a9f326eb | 5875 | err = super_types[mddev->major_version] |
1da177e4 LT |
5876 | .load_super(rdev, rdev0, mddev->minor_version); |
5877 | if (err < 0) { | |
f72ffdd6 | 5878 | printk(KERN_WARNING |
1da177e4 | 5879 | "md: %s has different UUID to %s\n", |
f72ffdd6 | 5880 | bdevname(rdev->bdev,b), |
1da177e4 LT |
5881 | bdevname(rdev0->bdev,b2)); |
5882 | export_rdev(rdev); | |
5883 | return -EINVAL; | |
5884 | } | |
5885 | } | |
5886 | err = bind_rdev_to_array(rdev, mddev); | |
5887 | if (err) | |
5888 | export_rdev(rdev); | |
5889 | return err; | |
5890 | } | |
5891 | ||
5892 | /* | |
5893 | * add_new_disk can be used once the array is assembled | |
5894 | * to add "hot spares". They must already have a superblock | |
5895 | * written | |
5896 | */ | |
5897 | if (mddev->pers) { | |
5898 | int err; | |
5899 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5900 | printk(KERN_WARNING |
1da177e4 LT |
5901 | "%s: personality does not support diskops!\n", |
5902 | mdname(mddev)); | |
5903 | return -EINVAL; | |
5904 | } | |
7b1e35f6 N |
5905 | if (mddev->persistent) |
5906 | rdev = md_import_device(dev, mddev->major_version, | |
5907 | mddev->minor_version); | |
5908 | else | |
5909 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 5910 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5911 | printk(KERN_WARNING |
1da177e4 LT |
5912 | "md: md_import_device returned %ld\n", |
5913 | PTR_ERR(rdev)); | |
5914 | return PTR_ERR(rdev); | |
5915 | } | |
1a855a06 | 5916 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5917 | if (!mddev->persistent) { |
5918 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5919 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5920 | rdev->raid_disk = info->raid_disk; |
bf572541 | 5921 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 5922 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 5923 | } else |
41158c7e | 5924 | rdev->raid_disk = -1; |
f466722c | 5925 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
5926 | } else |
5927 | super_types[mddev->major_version]. | |
5928 | validate_super(mddev, rdev); | |
bedd86b7 | 5929 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 5930 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
5931 | /* This was a hot-add request, but events doesn't |
5932 | * match, so reject it. | |
5933 | */ | |
5934 | export_rdev(rdev); | |
5935 | return -EINVAL; | |
5936 | } | |
5937 | ||
b2d444d7 | 5938 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5939 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5940 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5941 | else |
5942 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5943 | |
1aee41f6 GR |
5944 | /* |
5945 | * check whether the device shows up in other nodes | |
5946 | */ | |
5947 | if (mddev_is_clustered(mddev)) { | |
dbb64f86 | 5948 | if (info->state & (1 << MD_DISK_CANDIDATE)) |
1aee41f6 | 5949 | set_bit(Candidate, &rdev->flags); |
dbb64f86 | 5950 | else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { |
1aee41f6 | 5951 | /* --add initiated by this node */ |
dbb64f86 | 5952 | err = md_cluster_ops->add_new_disk(mddev, rdev); |
1aee41f6 | 5953 | if (err) { |
1aee41f6 GR |
5954 | export_rdev(rdev); |
5955 | return err; | |
5956 | } | |
5957 | } | |
5958 | } | |
5959 | ||
1da177e4 LT |
5960 | rdev->raid_disk = -1; |
5961 | err = bind_rdev_to_array(rdev, mddev); | |
dbb64f86 | 5962 | |
1da177e4 LT |
5963 | if (err) |
5964 | export_rdev(rdev); | |
dbb64f86 GR |
5965 | |
5966 | if (mddev_is_clustered(mddev)) { | |
5967 | if (info->state & (1 << MD_DISK_CANDIDATE)) | |
5968 | md_cluster_ops->new_disk_ack(mddev, (err == 0)); | |
5969 | else { | |
5970 | if (err) | |
5971 | md_cluster_ops->add_new_disk_cancel(mddev); | |
5972 | else | |
5973 | err = add_bound_rdev(rdev); | |
5974 | } | |
5975 | ||
5976 | } else if (!err) | |
a6da4ef8 | 5977 | err = add_bound_rdev(rdev); |
dbb64f86 | 5978 | |
1da177e4 LT |
5979 | return err; |
5980 | } | |
5981 | ||
5982 | /* otherwise, add_new_disk is only allowed | |
5983 | * for major_version==0 superblocks | |
5984 | */ | |
5985 | if (mddev->major_version != 0) { | |
5986 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5987 | mdname(mddev)); | |
5988 | return -EINVAL; | |
5989 | } | |
5990 | ||
5991 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5992 | int err; | |
d710e138 | 5993 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 5994 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5995 | printk(KERN_WARNING |
1da177e4 LT |
5996 | "md: error, md_import_device() returned %ld\n", |
5997 | PTR_ERR(rdev)); | |
5998 | return PTR_ERR(rdev); | |
5999 | } | |
6000 | rdev->desc_nr = info->number; | |
6001 | if (info->raid_disk < mddev->raid_disks) | |
6002 | rdev->raid_disk = info->raid_disk; | |
6003 | else | |
6004 | rdev->raid_disk = -1; | |
6005 | ||
1da177e4 | 6006 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
6007 | if (info->state & (1<<MD_DISK_SYNC)) |
6008 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 6009 | |
8ddf9efe N |
6010 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
6011 | set_bit(WriteMostly, &rdev->flags); | |
6012 | ||
1da177e4 LT |
6013 | if (!mddev->persistent) { |
6014 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
6015 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
6016 | } else | |
57b2caa3 | 6017 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 6018 | rdev->sectors = rdev->sb_start; |
1da177e4 | 6019 | |
2bf071bf N |
6020 | err = bind_rdev_to_array(rdev, mddev); |
6021 | if (err) { | |
6022 | export_rdev(rdev); | |
6023 | return err; | |
6024 | } | |
1da177e4 LT |
6025 | } |
6026 | ||
6027 | return 0; | |
6028 | } | |
6029 | ||
f72ffdd6 | 6030 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
6031 | { |
6032 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 6033 | struct md_rdev *rdev; |
1da177e4 | 6034 | |
1da177e4 LT |
6035 | rdev = find_rdev(mddev, dev); |
6036 | if (!rdev) | |
6037 | return -ENXIO; | |
6038 | ||
293467aa GR |
6039 | if (mddev_is_clustered(mddev)) |
6040 | md_cluster_ops->metadata_update_start(mddev); | |
6041 | ||
2910ff17 GR |
6042 | if (rdev->raid_disk < 0) |
6043 | goto kick_rdev; | |
6044 | ||
3ea8929d N |
6045 | clear_bit(Blocked, &rdev->flags); |
6046 | remove_and_add_spares(mddev, rdev); | |
6047 | ||
1da177e4 LT |
6048 | if (rdev->raid_disk >= 0) |
6049 | goto busy; | |
6050 | ||
2910ff17 | 6051 | kick_rdev: |
88bcfef7 GR |
6052 | if (mddev_is_clustered(mddev)) |
6053 | md_cluster_ops->remove_disk(mddev, rdev); | |
6054 | ||
fb56dfef | 6055 | md_kick_rdev_from_array(rdev); |
850b2b42 | 6056 | md_update_sb(mddev, 1); |
d7603b7e | 6057 | md_new_event(mddev); |
1da177e4 LT |
6058 | |
6059 | return 0; | |
6060 | busy: | |
293467aa GR |
6061 | if (mddev_is_clustered(mddev)) |
6062 | md_cluster_ops->metadata_update_cancel(mddev); | |
2910ff17 | 6063 | |
fdefa4d8 | 6064 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
6065 | bdevname(rdev->bdev,b), mdname(mddev)); |
6066 | return -EBUSY; | |
6067 | } | |
6068 | ||
f72ffdd6 | 6069 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
6070 | { |
6071 | char b[BDEVNAME_SIZE]; | |
6072 | int err; | |
3cb03002 | 6073 | struct md_rdev *rdev; |
1da177e4 LT |
6074 | |
6075 | if (!mddev->pers) | |
6076 | return -ENODEV; | |
6077 | ||
6078 | if (mddev->major_version != 0) { | |
6079 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
6080 | " version-0 superblocks.\n", | |
6081 | mdname(mddev)); | |
6082 | return -EINVAL; | |
6083 | } | |
6084 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 6085 | printk(KERN_WARNING |
1da177e4 LT |
6086 | "%s: personality does not support diskops!\n", |
6087 | mdname(mddev)); | |
6088 | return -EINVAL; | |
6089 | } | |
6090 | ||
d710e138 | 6091 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 6092 | if (IS_ERR(rdev)) { |
f72ffdd6 | 6093 | printk(KERN_WARNING |
1da177e4 LT |
6094 | "md: error, md_import_device() returned %ld\n", |
6095 | PTR_ERR(rdev)); | |
6096 | return -EINVAL; | |
6097 | } | |
6098 | ||
6099 | if (mddev->persistent) | |
57b2caa3 | 6100 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 6101 | else |
77304d2a | 6102 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 6103 | |
8190e754 | 6104 | rdev->sectors = rdev->sb_start; |
1da177e4 | 6105 | |
b2d444d7 | 6106 | if (test_bit(Faulty, &rdev->flags)) { |
f72ffdd6 | 6107 | printk(KERN_WARNING |
1da177e4 LT |
6108 | "md: can not hot-add faulty %s disk to %s!\n", |
6109 | bdevname(rdev->bdev,b), mdname(mddev)); | |
6110 | err = -EINVAL; | |
6111 | goto abort_export; | |
6112 | } | |
293467aa | 6113 | |
b2d444d7 | 6114 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 6115 | rdev->desc_nr = -1; |
5842730d | 6116 | rdev->saved_raid_disk = -1; |
2bf071bf N |
6117 | err = bind_rdev_to_array(rdev, mddev); |
6118 | if (err) | |
2aa82191 | 6119 | goto abort_export; |
1da177e4 LT |
6120 | |
6121 | /* | |
6122 | * The rest should better be atomic, we can have disk failures | |
6123 | * noticed in interrupt contexts ... | |
6124 | */ | |
6125 | ||
1da177e4 LT |
6126 | rdev->raid_disk = -1; |
6127 | ||
850b2b42 | 6128 | md_update_sb(mddev, 1); |
1da177e4 LT |
6129 | /* |
6130 | * Kick recovery, maybe this spare has to be added to the | |
6131 | * array immediately. | |
6132 | */ | |
6133 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6134 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 6135 | md_new_event(mddev); |
1da177e4 LT |
6136 | return 0; |
6137 | ||
1da177e4 LT |
6138 | abort_export: |
6139 | export_rdev(rdev); | |
6140 | return err; | |
6141 | } | |
6142 | ||
fd01b88c | 6143 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 6144 | { |
035328c2 | 6145 | int err = 0; |
32a7627c | 6146 | |
36fa3063 | 6147 | if (mddev->pers) { |
d66b1b39 | 6148 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
6149 | return -EBUSY; |
6150 | if (mddev->recovery || mddev->sync_thread) | |
6151 | return -EBUSY; | |
6152 | /* we should be able to change the bitmap.. */ | |
6153 | } | |
32a7627c | 6154 | |
36fa3063 | 6155 | if (fd >= 0) { |
035328c2 | 6156 | struct inode *inode; |
1e594bb2 N |
6157 | struct file *f; |
6158 | ||
6159 | if (mddev->bitmap || mddev->bitmap_info.file) | |
36fa3063 | 6160 | return -EEXIST; /* cannot add when bitmap is present */ |
1e594bb2 | 6161 | f = fget(fd); |
32a7627c | 6162 | |
1e594bb2 | 6163 | if (f == NULL) { |
36fa3063 N |
6164 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
6165 | mdname(mddev)); | |
6166 | return -EBADF; | |
6167 | } | |
6168 | ||
1e594bb2 | 6169 | inode = f->f_mapping->host; |
035328c2 N |
6170 | if (!S_ISREG(inode->i_mode)) { |
6171 | printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", | |
6172 | mdname(mddev)); | |
6173 | err = -EBADF; | |
1e594bb2 | 6174 | } else if (!(f->f_mode & FMODE_WRITE)) { |
035328c2 N |
6175 | printk(KERN_ERR "%s: error: bitmap file must open for write\n", |
6176 | mdname(mddev)); | |
6177 | err = -EBADF; | |
6178 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
36fa3063 N |
6179 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
6180 | mdname(mddev)); | |
035328c2 N |
6181 | err = -EBUSY; |
6182 | } | |
6183 | if (err) { | |
1e594bb2 | 6184 | fput(f); |
36fa3063 N |
6185 | return err; |
6186 | } | |
1e594bb2 | 6187 | mddev->bitmap_info.file = f; |
c3d9714e | 6188 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
6189 | } else if (mddev->bitmap == NULL) |
6190 | return -ENOENT; /* cannot remove what isn't there */ | |
6191 | err = 0; | |
6192 | if (mddev->pers) { | |
6193 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 6194 | if (fd >= 0) { |
f9209a32 GR |
6195 | struct bitmap *bitmap; |
6196 | ||
6197 | bitmap = bitmap_create(mddev, -1); | |
6198 | if (!IS_ERR(bitmap)) { | |
6199 | mddev->bitmap = bitmap; | |
69e51b44 | 6200 | err = bitmap_load(mddev); |
ba599aca N |
6201 | } else |
6202 | err = PTR_ERR(bitmap); | |
69e51b44 | 6203 | } |
d7375ab3 | 6204 | if (fd < 0 || err) { |
36fa3063 | 6205 | bitmap_destroy(mddev); |
d7375ab3 N |
6206 | fd = -1; /* make sure to put the file */ |
6207 | } | |
36fa3063 | 6208 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
6209 | } |
6210 | if (fd < 0) { | |
4af1a041 N |
6211 | struct file *f = mddev->bitmap_info.file; |
6212 | if (f) { | |
6213 | spin_lock(&mddev->lock); | |
6214 | mddev->bitmap_info.file = NULL; | |
6215 | spin_unlock(&mddev->lock); | |
6216 | fput(f); | |
6217 | } | |
36fa3063 N |
6218 | } |
6219 | ||
32a7627c N |
6220 | return err; |
6221 | } | |
6222 | ||
1da177e4 LT |
6223 | /* |
6224 | * set_array_info is used two different ways | |
6225 | * The original usage is when creating a new array. | |
6226 | * In this usage, raid_disks is > 0 and it together with | |
6227 | * level, size, not_persistent,layout,chunksize determine the | |
6228 | * shape of the array. | |
6229 | * This will always create an array with a type-0.90.0 superblock. | |
6230 | * The newer usage is when assembling an array. | |
6231 | * In this case raid_disks will be 0, and the major_version field is | |
6232 | * use to determine which style super-blocks are to be found on the devices. | |
6233 | * The minor and patch _version numbers are also kept incase the | |
6234 | * super_block handler wishes to interpret them. | |
6235 | */ | |
f72ffdd6 | 6236 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6237 | { |
6238 | ||
6239 | if (info->raid_disks == 0) { | |
6240 | /* just setting version number for superblock loading */ | |
6241 | if (info->major_version < 0 || | |
50511da3 | 6242 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
6243 | super_types[info->major_version].name == NULL) { |
6244 | /* maybe try to auto-load a module? */ | |
f72ffdd6 | 6245 | printk(KERN_INFO |
1da177e4 LT |
6246 | "md: superblock version %d not known\n", |
6247 | info->major_version); | |
6248 | return -EINVAL; | |
6249 | } | |
6250 | mddev->major_version = info->major_version; | |
6251 | mddev->minor_version = info->minor_version; | |
6252 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 6253 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
6254 | /* ensure mddev_put doesn't delete this now that there |
6255 | * is some minimal configuration. | |
6256 | */ | |
6257 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
6258 | return 0; |
6259 | } | |
6260 | mddev->major_version = MD_MAJOR_VERSION; | |
6261 | mddev->minor_version = MD_MINOR_VERSION; | |
6262 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
6263 | mddev->ctime = get_seconds(); | |
6264 | ||
6265 | mddev->level = info->level; | |
17115e03 | 6266 | mddev->clevel[0] = 0; |
58c0fed4 | 6267 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
6268 | mddev->raid_disks = info->raid_disks; |
6269 | /* don't set md_minor, it is determined by which /dev/md* was | |
6270 | * openned | |
6271 | */ | |
6272 | if (info->state & (1<<MD_SB_CLEAN)) | |
6273 | mddev->recovery_cp = MaxSector; | |
6274 | else | |
6275 | mddev->recovery_cp = 0; | |
6276 | mddev->persistent = ! info->not_persistent; | |
e691063a | 6277 | mddev->external = 0; |
1da177e4 LT |
6278 | |
6279 | mddev->layout = info->layout; | |
9d8f0363 | 6280 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
6281 | |
6282 | mddev->max_disks = MD_SB_DISKS; | |
6283 | ||
e691063a N |
6284 | if (mddev->persistent) |
6285 | mddev->flags = 0; | |
850b2b42 | 6286 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6287 | |
c3d9714e | 6288 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 6289 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 6290 | mddev->bitmap_info.offset = 0; |
b2a2703c | 6291 | |
f6705578 N |
6292 | mddev->reshape_position = MaxSector; |
6293 | ||
1da177e4 LT |
6294 | /* |
6295 | * Generate a 128 bit UUID | |
6296 | */ | |
6297 | get_random_bytes(mddev->uuid, 16); | |
6298 | ||
f6705578 | 6299 | mddev->new_level = mddev->level; |
664e7c41 | 6300 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
6301 | mddev->new_layout = mddev->layout; |
6302 | mddev->delta_disks = 0; | |
2c810cdd | 6303 | mddev->reshape_backwards = 0; |
f6705578 | 6304 | |
1da177e4 LT |
6305 | return 0; |
6306 | } | |
6307 | ||
fd01b88c | 6308 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 6309 | { |
b522adcd DW |
6310 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
6311 | ||
6312 | if (mddev->external_size) | |
6313 | return; | |
6314 | ||
1f403624 DW |
6315 | mddev->array_sectors = array_sectors; |
6316 | } | |
6317 | EXPORT_SYMBOL(md_set_array_sectors); | |
6318 | ||
fd01b88c | 6319 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6320 | { |
3cb03002 | 6321 | struct md_rdev *rdev; |
a35b0d69 | 6322 | int rv; |
d71f9f88 | 6323 | int fit = (num_sectors == 0); |
a35b0d69 N |
6324 | |
6325 | if (mddev->pers->resize == NULL) | |
6326 | return -EINVAL; | |
d71f9f88 AN |
6327 | /* The "num_sectors" is the number of sectors of each device that |
6328 | * is used. This can only make sense for arrays with redundancy. | |
6329 | * linear and raid0 always use whatever space is available. We can only | |
6330 | * consider changing this number if no resync or reconstruction is | |
6331 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6332 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6333 | * of each device. If num_sectors is zero, we find the largest size |
6334 | * that fits. | |
a35b0d69 | 6335 | */ |
f851b60d N |
6336 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
6337 | mddev->sync_thread) | |
a35b0d69 | 6338 | return -EBUSY; |
bd8839e0 N |
6339 | if (mddev->ro) |
6340 | return -EROFS; | |
a4a6125a | 6341 | |
dafb20fa | 6342 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6343 | sector_t avail = rdev->sectors; |
01ab5662 | 6344 | |
d71f9f88 AN |
6345 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6346 | num_sectors = avail; | |
6347 | if (avail < num_sectors) | |
a35b0d69 N |
6348 | return -ENOSPC; |
6349 | } | |
d71f9f88 | 6350 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6351 | if (!rv) |
6352 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6353 | return rv; |
6354 | } | |
6355 | ||
fd01b88c | 6356 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6357 | { |
6358 | int rv; | |
c6563a8c | 6359 | struct md_rdev *rdev; |
da943b99 | 6360 | /* change the number of raid disks */ |
63c70c4f | 6361 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6362 | return -EINVAL; |
bd8839e0 N |
6363 | if (mddev->ro) |
6364 | return -EROFS; | |
da943b99 | 6365 | if (raid_disks <= 0 || |
233fca36 | 6366 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6367 | return -EINVAL; |
f851b60d N |
6368 | if (mddev->sync_thread || |
6369 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6370 | mddev->reshape_position != MaxSector) | |
da943b99 | 6371 | return -EBUSY; |
c6563a8c N |
6372 | |
6373 | rdev_for_each(rdev, mddev) { | |
6374 | if (mddev->raid_disks < raid_disks && | |
6375 | rdev->data_offset < rdev->new_data_offset) | |
6376 | return -EINVAL; | |
6377 | if (mddev->raid_disks > raid_disks && | |
6378 | rdev->data_offset > rdev->new_data_offset) | |
6379 | return -EINVAL; | |
6380 | } | |
6381 | ||
63c70c4f | 6382 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6383 | if (mddev->delta_disks < 0) |
6384 | mddev->reshape_backwards = 1; | |
6385 | else if (mddev->delta_disks > 0) | |
6386 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6387 | |
6388 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6389 | if (rv < 0) { |
de171cb9 | 6390 | mddev->delta_disks = 0; |
2c810cdd N |
6391 | mddev->reshape_backwards = 0; |
6392 | } | |
da943b99 N |
6393 | return rv; |
6394 | } | |
6395 | ||
1da177e4 LT |
6396 | /* |
6397 | * update_array_info is used to change the configuration of an | |
6398 | * on-line array. | |
6399 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6400 | * fields in the info are checked against the array. | |
6401 | * Any differences that cannot be handled will cause an error. | |
6402 | * Normally, only one change can be managed at a time. | |
6403 | */ | |
fd01b88c | 6404 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6405 | { |
6406 | int rv = 0; | |
6407 | int cnt = 0; | |
36fa3063 N |
6408 | int state = 0; |
6409 | ||
6410 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6411 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6412 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6413 | |
6414 | if (mddev->major_version != info->major_version || | |
6415 | mddev->minor_version != info->minor_version || | |
6416 | /* mddev->patch_version != info->patch_version || */ | |
6417 | mddev->ctime != info->ctime || | |
6418 | mddev->level != info->level || | |
6419 | /* mddev->layout != info->layout || */ | |
4e023612 | 6420 | mddev->persistent != !info->not_persistent || |
9d8f0363 | 6421 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6422 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6423 | ((state^info->state) & 0xfffffe00) | |
6424 | ) | |
1da177e4 LT |
6425 | return -EINVAL; |
6426 | /* Check there is only one change */ | |
58c0fed4 AN |
6427 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6428 | cnt++; | |
6429 | if (mddev->raid_disks != info->raid_disks) | |
6430 | cnt++; | |
6431 | if (mddev->layout != info->layout) | |
6432 | cnt++; | |
6433 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6434 | cnt++; | |
6435 | if (cnt == 0) | |
6436 | return 0; | |
6437 | if (cnt > 1) | |
6438 | return -EINVAL; | |
1da177e4 LT |
6439 | |
6440 | if (mddev->layout != info->layout) { | |
6441 | /* Change layout | |
6442 | * we don't need to do anything at the md level, the | |
6443 | * personality will take care of it all. | |
6444 | */ | |
50ac168a | 6445 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6446 | return -EINVAL; |
597a711b N |
6447 | else { |
6448 | mddev->new_layout = info->layout; | |
50ac168a | 6449 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6450 | if (rv) |
6451 | mddev->new_layout = mddev->layout; | |
6452 | return rv; | |
6453 | } | |
1da177e4 | 6454 | } |
58c0fed4 | 6455 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6456 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6457 | |
da943b99 N |
6458 | if (mddev->raid_disks != info->raid_disks) |
6459 | rv = update_raid_disks(mddev, info->raid_disks); | |
6460 | ||
36fa3063 | 6461 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
293467aa GR |
6462 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) { |
6463 | rv = -EINVAL; | |
6464 | goto err; | |
6465 | } | |
6466 | if (mddev->recovery || mddev->sync_thread) { | |
6467 | rv = -EBUSY; | |
6468 | goto err; | |
6469 | } | |
36fa3063 | 6470 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { |
f9209a32 | 6471 | struct bitmap *bitmap; |
36fa3063 | 6472 | /* add the bitmap */ |
293467aa GR |
6473 | if (mddev->bitmap) { |
6474 | rv = -EEXIST; | |
6475 | goto err; | |
6476 | } | |
6477 | if (mddev->bitmap_info.default_offset == 0) { | |
6478 | rv = -EINVAL; | |
6479 | goto err; | |
6480 | } | |
c3d9714e N |
6481 | mddev->bitmap_info.offset = |
6482 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6483 | mddev->bitmap_info.space = |
6484 | mddev->bitmap_info.default_space; | |
36fa3063 | 6485 | mddev->pers->quiesce(mddev, 1); |
f9209a32 GR |
6486 | bitmap = bitmap_create(mddev, -1); |
6487 | if (!IS_ERR(bitmap)) { | |
6488 | mddev->bitmap = bitmap; | |
69e51b44 | 6489 | rv = bitmap_load(mddev); |
ba599aca N |
6490 | } else |
6491 | rv = PTR_ERR(bitmap); | |
36fa3063 N |
6492 | if (rv) |
6493 | bitmap_destroy(mddev); | |
6494 | mddev->pers->quiesce(mddev, 0); | |
6495 | } else { | |
6496 | /* remove the bitmap */ | |
293467aa GR |
6497 | if (!mddev->bitmap) { |
6498 | rv = -ENOENT; | |
6499 | goto err; | |
6500 | } | |
6501 | if (mddev->bitmap->storage.file) { | |
6502 | rv = -EINVAL; | |
6503 | goto err; | |
6504 | } | |
36fa3063 N |
6505 | mddev->pers->quiesce(mddev, 1); |
6506 | bitmap_destroy(mddev); | |
6507 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6508 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6509 | } |
6510 | } | |
850b2b42 | 6511 | md_update_sb(mddev, 1); |
293467aa GR |
6512 | return rv; |
6513 | err: | |
1da177e4 LT |
6514 | return rv; |
6515 | } | |
6516 | ||
fd01b88c | 6517 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6518 | { |
3cb03002 | 6519 | struct md_rdev *rdev; |
1ca69c4b | 6520 | int err = 0; |
1da177e4 LT |
6521 | |
6522 | if (mddev->pers == NULL) | |
6523 | return -ENODEV; | |
6524 | ||
1ca69c4b N |
6525 | rcu_read_lock(); |
6526 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6527 | if (!rdev) |
1ca69c4b N |
6528 | err = -ENODEV; |
6529 | else { | |
6530 | md_error(mddev, rdev); | |
6531 | if (!test_bit(Faulty, &rdev->flags)) | |
6532 | err = -EBUSY; | |
6533 | } | |
6534 | rcu_read_unlock(); | |
6535 | return err; | |
1da177e4 LT |
6536 | } |
6537 | ||
2f9618ce AN |
6538 | /* |
6539 | * We have a problem here : there is no easy way to give a CHS | |
6540 | * virtual geometry. We currently pretend that we have a 2 heads | |
6541 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6542 | * dosfs just mad... ;-) | |
6543 | */ | |
a885c8c4 CH |
6544 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6545 | { | |
fd01b88c | 6546 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6547 | |
6548 | geo->heads = 2; | |
6549 | geo->sectors = 4; | |
49ce6cea | 6550 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6551 | return 0; |
6552 | } | |
6553 | ||
cb335f88 NS |
6554 | static inline bool md_ioctl_valid(unsigned int cmd) |
6555 | { | |
6556 | switch (cmd) { | |
6557 | case ADD_NEW_DISK: | |
6558 | case BLKROSET: | |
6559 | case GET_ARRAY_INFO: | |
6560 | case GET_BITMAP_FILE: | |
6561 | case GET_DISK_INFO: | |
6562 | case HOT_ADD_DISK: | |
6563 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
6564 | case RAID_AUTORUN: |
6565 | case RAID_VERSION: | |
6566 | case RESTART_ARRAY_RW: | |
6567 | case RUN_ARRAY: | |
6568 | case SET_ARRAY_INFO: | |
6569 | case SET_BITMAP_FILE: | |
6570 | case SET_DISK_FAULTY: | |
6571 | case STOP_ARRAY: | |
6572 | case STOP_ARRAY_RO: | |
1aee41f6 | 6573 | case CLUSTERED_DISK_NACK: |
cb335f88 NS |
6574 | return true; |
6575 | default: | |
6576 | return false; | |
6577 | } | |
6578 | } | |
6579 | ||
a39907fa | 6580 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6581 | unsigned int cmd, unsigned long arg) |
6582 | { | |
6583 | int err = 0; | |
6584 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6585 | struct mddev *mddev = NULL; |
e2218350 | 6586 | int ro; |
1da177e4 | 6587 | |
cb335f88 NS |
6588 | if (!md_ioctl_valid(cmd)) |
6589 | return -ENOTTY; | |
6590 | ||
506c9e44 N |
6591 | switch (cmd) { |
6592 | case RAID_VERSION: | |
6593 | case GET_ARRAY_INFO: | |
6594 | case GET_DISK_INFO: | |
6595 | break; | |
6596 | default: | |
6597 | if (!capable(CAP_SYS_ADMIN)) | |
6598 | return -EACCES; | |
6599 | } | |
1da177e4 LT |
6600 | |
6601 | /* | |
6602 | * Commands dealing with the RAID driver but not any | |
6603 | * particular array: | |
6604 | */ | |
c02c0aeb N |
6605 | switch (cmd) { |
6606 | case RAID_VERSION: | |
6607 | err = get_version(argp); | |
3adc28d8 | 6608 | goto out; |
1da177e4 | 6609 | |
1da177e4 | 6610 | #ifndef MODULE |
c02c0aeb N |
6611 | case RAID_AUTORUN: |
6612 | err = 0; | |
6613 | autostart_arrays(arg); | |
3adc28d8 | 6614 | goto out; |
1da177e4 | 6615 | #endif |
c02c0aeb | 6616 | default:; |
1da177e4 LT |
6617 | } |
6618 | ||
6619 | /* | |
6620 | * Commands creating/starting a new array: | |
6621 | */ | |
6622 | ||
a39907fa | 6623 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6624 | |
6625 | if (!mddev) { | |
6626 | BUG(); | |
3adc28d8 | 6627 | goto out; |
1da177e4 LT |
6628 | } |
6629 | ||
1ca69c4b N |
6630 | /* Some actions do not requires the mutex */ |
6631 | switch (cmd) { | |
6632 | case GET_ARRAY_INFO: | |
6633 | if (!mddev->raid_disks && !mddev->external) | |
6634 | err = -ENODEV; | |
6635 | else | |
6636 | err = get_array_info(mddev, argp); | |
3adc28d8 | 6637 | goto out; |
1ca69c4b N |
6638 | |
6639 | case GET_DISK_INFO: | |
6640 | if (!mddev->raid_disks && !mddev->external) | |
6641 | err = -ENODEV; | |
6642 | else | |
6643 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 6644 | goto out; |
1ca69c4b N |
6645 | |
6646 | case SET_DISK_FAULTY: | |
6647 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6648 | goto out; |
4af1a041 N |
6649 | |
6650 | case GET_BITMAP_FILE: | |
6651 | err = get_bitmap_file(mddev, argp); | |
6652 | goto out; | |
6653 | ||
1ca69c4b N |
6654 | } |
6655 | ||
a7a3f08d N |
6656 | if (cmd == ADD_NEW_DISK) |
6657 | /* need to ensure md_delayed_delete() has completed */ | |
6658 | flush_workqueue(md_misc_wq); | |
6659 | ||
90f5f7ad HR |
6660 | if (cmd == HOT_REMOVE_DISK) |
6661 | /* need to ensure recovery thread has run */ | |
6662 | wait_event_interruptible_timeout(mddev->sb_wait, | |
6663 | !test_bit(MD_RECOVERY_NEEDED, | |
6664 | &mddev->flags), | |
6665 | msecs_to_jiffies(5000)); | |
260fa034 N |
6666 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
6667 | /* Need to flush page cache, and ensure no-one else opens | |
6668 | * and writes | |
6669 | */ | |
6670 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 6671 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
6672 | mutex_unlock(&mddev->open_mutex); |
6673 | err = -EBUSY; | |
3adc28d8 | 6674 | goto out; |
260fa034 N |
6675 | } |
6676 | set_bit(MD_STILL_CLOSED, &mddev->flags); | |
6677 | mutex_unlock(&mddev->open_mutex); | |
6678 | sync_blockdev(bdev); | |
6679 | } | |
1da177e4 LT |
6680 | err = mddev_lock(mddev); |
6681 | if (err) { | |
f72ffdd6 | 6682 | printk(KERN_INFO |
1da177e4 LT |
6683 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
6684 | err, cmd); | |
3adc28d8 | 6685 | goto out; |
1da177e4 LT |
6686 | } |
6687 | ||
c02c0aeb N |
6688 | if (cmd == SET_ARRAY_INFO) { |
6689 | mdu_array_info_t info; | |
6690 | if (!arg) | |
6691 | memset(&info, 0, sizeof(info)); | |
6692 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6693 | err = -EFAULT; | |
3adc28d8 | 6694 | goto unlock; |
c02c0aeb N |
6695 | } |
6696 | if (mddev->pers) { | |
6697 | err = update_array_info(mddev, &info); | |
6698 | if (err) { | |
6699 | printk(KERN_WARNING "md: couldn't update" | |
6700 | " array info. %d\n", err); | |
3adc28d8 | 6701 | goto unlock; |
1da177e4 | 6702 | } |
3adc28d8 | 6703 | goto unlock; |
c02c0aeb N |
6704 | } |
6705 | if (!list_empty(&mddev->disks)) { | |
6706 | printk(KERN_WARNING | |
6707 | "md: array %s already has disks!\n", | |
6708 | mdname(mddev)); | |
6709 | err = -EBUSY; | |
3adc28d8 | 6710 | goto unlock; |
c02c0aeb N |
6711 | } |
6712 | if (mddev->raid_disks) { | |
6713 | printk(KERN_WARNING | |
6714 | "md: array %s already initialised!\n", | |
6715 | mdname(mddev)); | |
6716 | err = -EBUSY; | |
3adc28d8 | 6717 | goto unlock; |
c02c0aeb N |
6718 | } |
6719 | err = set_array_info(mddev, &info); | |
6720 | if (err) { | |
6721 | printk(KERN_WARNING "md: couldn't set" | |
6722 | " array info. %d\n", err); | |
3adc28d8 | 6723 | goto unlock; |
c02c0aeb | 6724 | } |
3adc28d8 | 6725 | goto unlock; |
1da177e4 LT |
6726 | } |
6727 | ||
6728 | /* | |
6729 | * Commands querying/configuring an existing array: | |
6730 | */ | |
32a7627c | 6731 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6732 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6733 | if ((!mddev->raid_disks && !mddev->external) |
6734 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6735 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6736 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 6737 | err = -ENODEV; |
3adc28d8 | 6738 | goto unlock; |
1da177e4 LT |
6739 | } |
6740 | ||
6741 | /* | |
6742 | * Commands even a read-only array can execute: | |
6743 | */ | |
c02c0aeb | 6744 | switch (cmd) { |
c02c0aeb N |
6745 | case RESTART_ARRAY_RW: |
6746 | err = restart_array(mddev); | |
3adc28d8 | 6747 | goto unlock; |
1da177e4 | 6748 | |
c02c0aeb N |
6749 | case STOP_ARRAY: |
6750 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 6751 | goto unlock; |
1da177e4 | 6752 | |
c02c0aeb N |
6753 | case STOP_ARRAY_RO: |
6754 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 6755 | goto unlock; |
1da177e4 | 6756 | |
3ea8929d N |
6757 | case HOT_REMOVE_DISK: |
6758 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6759 | goto unlock; |
3ea8929d | 6760 | |
7ceb17e8 N |
6761 | case ADD_NEW_DISK: |
6762 | /* We can support ADD_NEW_DISK on read-only arrays | |
6763 | * on if we are re-adding a preexisting device. | |
6764 | * So require mddev->pers and MD_DISK_SYNC. | |
6765 | */ | |
6766 | if (mddev->pers) { | |
6767 | mdu_disk_info_t info; | |
6768 | if (copy_from_user(&info, argp, sizeof(info))) | |
6769 | err = -EFAULT; | |
6770 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6771 | /* Need to clear read-only for this */ | |
6772 | break; | |
6773 | else | |
6774 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6775 | goto unlock; |
7ceb17e8 N |
6776 | } |
6777 | break; | |
6778 | ||
c02c0aeb N |
6779 | case BLKROSET: |
6780 | if (get_user(ro, (int __user *)(arg))) { | |
6781 | err = -EFAULT; | |
3adc28d8 | 6782 | goto unlock; |
c02c0aeb N |
6783 | } |
6784 | err = -EINVAL; | |
e2218350 | 6785 | |
c02c0aeb N |
6786 | /* if the bdev is going readonly the value of mddev->ro |
6787 | * does not matter, no writes are coming | |
6788 | */ | |
6789 | if (ro) | |
3adc28d8 | 6790 | goto unlock; |
e2218350 | 6791 | |
c02c0aeb N |
6792 | /* are we are already prepared for writes? */ |
6793 | if (mddev->ro != 1) | |
3adc28d8 | 6794 | goto unlock; |
e2218350 | 6795 | |
c02c0aeb N |
6796 | /* transitioning to readauto need only happen for |
6797 | * arrays that call md_write_start | |
6798 | */ | |
6799 | if (mddev->pers) { | |
6800 | err = restart_array(mddev); | |
6801 | if (err == 0) { | |
6802 | mddev->ro = 2; | |
6803 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6804 | } |
c02c0aeb | 6805 | } |
3adc28d8 | 6806 | goto unlock; |
1da177e4 LT |
6807 | } |
6808 | ||
6809 | /* | |
6810 | * The remaining ioctls are changing the state of the | |
f91de92e | 6811 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 6812 | */ |
326eb17d | 6813 | if (mddev->ro && mddev->pers) { |
f91de92e N |
6814 | if (mddev->ro == 2) { |
6815 | mddev->ro = 0; | |
00bcb4ac | 6816 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6817 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6818 | /* mddev_unlock will wake thread */ |
6819 | /* If a device failed while we were read-only, we | |
6820 | * need to make sure the metadata is updated now. | |
6821 | */ | |
6822 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6823 | mddev_unlock(mddev); | |
6824 | wait_event(mddev->sb_wait, | |
6825 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6826 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
29f097c4 | 6827 | mddev_lock_nointr(mddev); |
f3378b48 | 6828 | } |
f91de92e N |
6829 | } else { |
6830 | err = -EROFS; | |
3adc28d8 | 6831 | goto unlock; |
f91de92e | 6832 | } |
1da177e4 LT |
6833 | } |
6834 | ||
c02c0aeb N |
6835 | switch (cmd) { |
6836 | case ADD_NEW_DISK: | |
1da177e4 | 6837 | { |
c02c0aeb N |
6838 | mdu_disk_info_t info; |
6839 | if (copy_from_user(&info, argp, sizeof(info))) | |
6840 | err = -EFAULT; | |
6841 | else | |
6842 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6843 | goto unlock; |
c02c0aeb | 6844 | } |
1da177e4 | 6845 | |
1aee41f6 GR |
6846 | case CLUSTERED_DISK_NACK: |
6847 | if (mddev_is_clustered(mddev)) | |
6848 | md_cluster_ops->new_disk_ack(mddev, false); | |
6849 | else | |
6850 | err = -EINVAL; | |
6851 | goto unlock; | |
6852 | ||
c02c0aeb N |
6853 | case HOT_ADD_DISK: |
6854 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6855 | goto unlock; |
1da177e4 | 6856 | |
c02c0aeb N |
6857 | case RUN_ARRAY: |
6858 | err = do_md_run(mddev); | |
3adc28d8 | 6859 | goto unlock; |
1da177e4 | 6860 | |
c02c0aeb N |
6861 | case SET_BITMAP_FILE: |
6862 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 6863 | goto unlock; |
32a7627c | 6864 | |
c02c0aeb N |
6865 | default: |
6866 | err = -EINVAL; | |
3adc28d8 | 6867 | goto unlock; |
1da177e4 LT |
6868 | } |
6869 | ||
3adc28d8 | 6870 | unlock: |
d3374825 N |
6871 | if (mddev->hold_active == UNTIL_IOCTL && |
6872 | err != -EINVAL) | |
6873 | mddev->hold_active = 0; | |
1da177e4 | 6874 | mddev_unlock(mddev); |
3adc28d8 | 6875 | out: |
1da177e4 LT |
6876 | return err; |
6877 | } | |
aa98aa31 AB |
6878 | #ifdef CONFIG_COMPAT |
6879 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6880 | unsigned int cmd, unsigned long arg) | |
6881 | { | |
6882 | switch (cmd) { | |
6883 | case HOT_REMOVE_DISK: | |
6884 | case HOT_ADD_DISK: | |
6885 | case SET_DISK_FAULTY: | |
6886 | case SET_BITMAP_FILE: | |
6887 | /* These take in integer arg, do not convert */ | |
6888 | break; | |
6889 | default: | |
6890 | arg = (unsigned long)compat_ptr(arg); | |
6891 | break; | |
6892 | } | |
6893 | ||
6894 | return md_ioctl(bdev, mode, cmd, arg); | |
6895 | } | |
6896 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6897 | |
a39907fa | 6898 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6899 | { |
6900 | /* | |
6901 | * Succeed if we can lock the mddev, which confirms that | |
6902 | * it isn't being stopped right now. | |
6903 | */ | |
fd01b88c | 6904 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6905 | int err; |
6906 | ||
0c098220 YL |
6907 | if (!mddev) |
6908 | return -ENODEV; | |
6909 | ||
d3374825 N |
6910 | if (mddev->gendisk != bdev->bd_disk) { |
6911 | /* we are racing with mddev_put which is discarding this | |
6912 | * bd_disk. | |
6913 | */ | |
6914 | mddev_put(mddev); | |
6915 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6916 | flush_workqueue(md_misc_wq); |
d3374825 N |
6917 | /* Then retry the open from the top */ |
6918 | return -ERESTARTSYS; | |
6919 | } | |
6920 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6921 | ||
c8c00a69 | 6922 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6923 | goto out; |
6924 | ||
6925 | err = 0; | |
f2ea68cf | 6926 | atomic_inc(&mddev->openers); |
260fa034 | 6927 | clear_bit(MD_STILL_CLOSED, &mddev->flags); |
c8c00a69 | 6928 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6929 | |
f0b4f7e2 | 6930 | check_disk_change(bdev); |
1da177e4 LT |
6931 | out: |
6932 | return err; | |
6933 | } | |
6934 | ||
db2a144b | 6935 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6936 | { |
f72ffdd6 | 6937 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6938 | |
52e5f9d1 | 6939 | BUG_ON(!mddev); |
f2ea68cf | 6940 | atomic_dec(&mddev->openers); |
1da177e4 | 6941 | mddev_put(mddev); |
1da177e4 | 6942 | } |
f0b4f7e2 N |
6943 | |
6944 | static int md_media_changed(struct gendisk *disk) | |
6945 | { | |
fd01b88c | 6946 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6947 | |
6948 | return mddev->changed; | |
6949 | } | |
6950 | ||
6951 | static int md_revalidate(struct gendisk *disk) | |
6952 | { | |
fd01b88c | 6953 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6954 | |
6955 | mddev->changed = 0; | |
6956 | return 0; | |
6957 | } | |
83d5cde4 | 6958 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6959 | { |
6960 | .owner = THIS_MODULE, | |
a39907fa AV |
6961 | .open = md_open, |
6962 | .release = md_release, | |
b492b852 | 6963 | .ioctl = md_ioctl, |
aa98aa31 AB |
6964 | #ifdef CONFIG_COMPAT |
6965 | .compat_ioctl = md_compat_ioctl, | |
6966 | #endif | |
a885c8c4 | 6967 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6968 | .media_changed = md_media_changed, |
6969 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6970 | }; |
6971 | ||
f72ffdd6 | 6972 | static int md_thread(void *arg) |
1da177e4 | 6973 | { |
2b8bf345 | 6974 | struct md_thread *thread = arg; |
1da177e4 | 6975 | |
1da177e4 LT |
6976 | /* |
6977 | * md_thread is a 'system-thread', it's priority should be very | |
6978 | * high. We avoid resource deadlocks individually in each | |
6979 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6980 | * the very same RT priority as kswapd, thus we will never get | |
6981 | * into a priority inversion deadlock. | |
6982 | * | |
6983 | * we definitely have to have equal or higher priority than | |
6984 | * bdflush, otherwise bdflush will deadlock if there are too | |
6985 | * many dirty RAID5 blocks. | |
6986 | */ | |
1da177e4 | 6987 | |
6985c43f | 6988 | allow_signal(SIGKILL); |
a6fb0934 | 6989 | while (!kthread_should_stop()) { |
1da177e4 | 6990 | |
93588e22 N |
6991 | /* We need to wait INTERRUPTIBLE so that |
6992 | * we don't add to the load-average. | |
6993 | * That means we need to be sure no signals are | |
6994 | * pending | |
6995 | */ | |
6996 | if (signal_pending(current)) | |
6997 | flush_signals(current); | |
6998 | ||
6999 | wait_event_interruptible_timeout | |
7000 | (thread->wqueue, | |
7001 | test_bit(THREAD_WAKEUP, &thread->flags) | |
7002 | || kthread_should_stop(), | |
7003 | thread->timeout); | |
1da177e4 | 7004 | |
6c987910 N |
7005 | clear_bit(THREAD_WAKEUP, &thread->flags); |
7006 | if (!kthread_should_stop()) | |
4ed8731d | 7007 | thread->run(thread); |
1da177e4 | 7008 | } |
a6fb0934 | 7009 | |
1da177e4 LT |
7010 | return 0; |
7011 | } | |
7012 | ||
2b8bf345 | 7013 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
7014 | { |
7015 | if (thread) { | |
36a4e1fe | 7016 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
7017 | set_bit(THREAD_WAKEUP, &thread->flags); |
7018 | wake_up(&thread->wqueue); | |
7019 | } | |
7020 | } | |
6c144d31 | 7021 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 7022 | |
4ed8731d SL |
7023 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
7024 | struct mddev *mddev, const char *name) | |
1da177e4 | 7025 | { |
2b8bf345 | 7026 | struct md_thread *thread; |
1da177e4 | 7027 | |
2b8bf345 | 7028 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
7029 | if (!thread) |
7030 | return NULL; | |
7031 | ||
1da177e4 LT |
7032 | init_waitqueue_head(&thread->wqueue); |
7033 | ||
1da177e4 LT |
7034 | thread->run = run; |
7035 | thread->mddev = mddev; | |
32a7627c | 7036 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
7037 | thread->tsk = kthread_run(md_thread, thread, |
7038 | "%s_%s", | |
7039 | mdname(thread->mddev), | |
0232605d | 7040 | name); |
a6fb0934 | 7041 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
7042 | kfree(thread); |
7043 | return NULL; | |
7044 | } | |
1da177e4 LT |
7045 | return thread; |
7046 | } | |
6c144d31 | 7047 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 7048 | |
2b8bf345 | 7049 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 7050 | { |
2b8bf345 | 7051 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
7052 | if (!thread) |
7053 | return; | |
36a4e1fe | 7054 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
7055 | /* Locking ensures that mddev_unlock does not wake_up a |
7056 | * non-existent thread | |
7057 | */ | |
7058 | spin_lock(&pers_lock); | |
7059 | *threadp = NULL; | |
7060 | spin_unlock(&pers_lock); | |
a6fb0934 N |
7061 | |
7062 | kthread_stop(thread->tsk); | |
1da177e4 LT |
7063 | kfree(thread); |
7064 | } | |
6c144d31 | 7065 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 7066 | |
fd01b88c | 7067 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7068 | { |
b2d444d7 | 7069 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 7070 | return; |
6bfe0b49 | 7071 | |
de393cde | 7072 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
7073 | return; |
7074 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
7075 | if (mddev->degraded) |
7076 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 7077 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
7078 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7079 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7080 | md_wakeup_thread(mddev->thread); | |
768a418d | 7081 | if (mddev->event_work.func) |
e804ac78 | 7082 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 7083 | md_new_event_inintr(mddev); |
1da177e4 | 7084 | } |
6c144d31 | 7085 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
7086 | |
7087 | /* seq_file implementation /proc/mdstat */ | |
7088 | ||
7089 | static void status_unused(struct seq_file *seq) | |
7090 | { | |
7091 | int i = 0; | |
3cb03002 | 7092 | struct md_rdev *rdev; |
1da177e4 LT |
7093 | |
7094 | seq_printf(seq, "unused devices: "); | |
7095 | ||
159ec1fc | 7096 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
7097 | char b[BDEVNAME_SIZE]; |
7098 | i++; | |
7099 | seq_printf(seq, "%s ", | |
7100 | bdevname(rdev->bdev,b)); | |
7101 | } | |
7102 | if (!i) | |
7103 | seq_printf(seq, "<none>"); | |
7104 | ||
7105 | seq_printf(seq, "\n"); | |
7106 | } | |
7107 | ||
f7851be7 | 7108 | static int status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 7109 | { |
dd71cf6b N |
7110 | sector_t max_sectors, resync, res; |
7111 | unsigned long dt, db; | |
7112 | sector_t rt; | |
4588b42e N |
7113 | int scale; |
7114 | unsigned int per_milli; | |
1da177e4 | 7115 | |
c804cdec N |
7116 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
7117 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 7118 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 7119 | else |
dd71cf6b | 7120 | max_sectors = mddev->dev_sectors; |
1da177e4 | 7121 | |
f7851be7 N |
7122 | resync = mddev->curr_resync; |
7123 | if (resync <= 3) { | |
7124 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7125 | /* Still cleaning up */ | |
7126 | resync = max_sectors; | |
7127 | } else | |
7128 | resync -= atomic_read(&mddev->recovery_active); | |
7129 | ||
7130 | if (resync == 0) { | |
7131 | if (mddev->recovery_cp < MaxSector) { | |
7132 | seq_printf(seq, "\tresync=PENDING"); | |
7133 | return 1; | |
7134 | } | |
7135 | return 0; | |
7136 | } | |
7137 | if (resync < 3) { | |
7138 | seq_printf(seq, "\tresync=DELAYED"); | |
7139 | return 1; | |
7140 | } | |
7141 | ||
403df478 | 7142 | WARN_ON(max_sectors == 0); |
4588b42e | 7143 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 7144 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
7145 | * u32, as those are the requirements for sector_div. |
7146 | * Thus 'scale' must be at least 10 | |
7147 | */ | |
7148 | scale = 10; | |
7149 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 7150 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
7151 | scale++; |
7152 | } | |
7153 | res = (resync>>scale)*1000; | |
dd71cf6b | 7154 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
7155 | |
7156 | per_milli = res; | |
1da177e4 | 7157 | { |
4588b42e | 7158 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
7159 | seq_printf(seq, "["); |
7160 | for (i = 0; i < x; i++) | |
7161 | seq_printf(seq, "="); | |
7162 | seq_printf(seq, ">"); | |
7163 | for (i = 0; i < y; i++) | |
7164 | seq_printf(seq, "."); | |
7165 | seq_printf(seq, "] "); | |
7166 | } | |
4588b42e | 7167 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
7168 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
7169 | "reshape" : | |
61df9d91 N |
7170 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
7171 | "check" : | |
7172 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
7173 | "resync" : "recovery"))), | |
7174 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
7175 | (unsigned long long) resync/2, |
7176 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
7177 | |
7178 | /* | |
1da177e4 LT |
7179 | * dt: time from mark until now |
7180 | * db: blocks written from mark until now | |
7181 | * rt: remaining time | |
dd71cf6b N |
7182 | * |
7183 | * rt is a sector_t, so could be 32bit or 64bit. | |
7184 | * So we divide before multiply in case it is 32bit and close | |
7185 | * to the limit. | |
25985edc | 7186 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
7187 | * near the end of resync when the number of remaining sectors |
7188 | * is close to 'db'. | |
7189 | * We then divide rt by 32 after multiplying by db to compensate. | |
7190 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
7191 | */ |
7192 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
7193 | if (!dt) dt++; | |
ff4e8d9a N |
7194 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
7195 | - mddev->resync_mark_cnt; | |
1da177e4 | 7196 | |
dd71cf6b N |
7197 | rt = max_sectors - resync; /* number of remaining sectors */ |
7198 | sector_div(rt, db/32+1); | |
7199 | rt *= dt; | |
7200 | rt >>= 5; | |
7201 | ||
7202 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
7203 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 7204 | |
ff4e8d9a | 7205 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
f7851be7 | 7206 | return 1; |
1da177e4 LT |
7207 | } |
7208 | ||
7209 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
7210 | { | |
7211 | struct list_head *tmp; | |
7212 | loff_t l = *pos; | |
fd01b88c | 7213 | struct mddev *mddev; |
1da177e4 LT |
7214 | |
7215 | if (l >= 0x10000) | |
7216 | return NULL; | |
7217 | if (!l--) | |
7218 | /* header */ | |
7219 | return (void*)1; | |
7220 | ||
7221 | spin_lock(&all_mddevs_lock); | |
7222 | list_for_each(tmp,&all_mddevs) | |
7223 | if (!l--) { | |
fd01b88c | 7224 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
7225 | mddev_get(mddev); |
7226 | spin_unlock(&all_mddevs_lock); | |
7227 | return mddev; | |
7228 | } | |
7229 | spin_unlock(&all_mddevs_lock); | |
7230 | if (!l--) | |
7231 | return (void*)2;/* tail */ | |
7232 | return NULL; | |
7233 | } | |
7234 | ||
7235 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
7236 | { | |
7237 | struct list_head *tmp; | |
fd01b88c | 7238 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 7239 | |
1da177e4 LT |
7240 | ++*pos; |
7241 | if (v == (void*)2) | |
7242 | return NULL; | |
7243 | ||
7244 | spin_lock(&all_mddevs_lock); | |
7245 | if (v == (void*)1) | |
7246 | tmp = all_mddevs.next; | |
7247 | else | |
7248 | tmp = mddev->all_mddevs.next; | |
7249 | if (tmp != &all_mddevs) | |
fd01b88c | 7250 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
7251 | else { |
7252 | next_mddev = (void*)2; | |
7253 | *pos = 0x10000; | |
f72ffdd6 | 7254 | } |
1da177e4 LT |
7255 | spin_unlock(&all_mddevs_lock); |
7256 | ||
7257 | if (v != (void*)1) | |
7258 | mddev_put(mddev); | |
7259 | return next_mddev; | |
7260 | ||
7261 | } | |
7262 | ||
7263 | static void md_seq_stop(struct seq_file *seq, void *v) | |
7264 | { | |
fd01b88c | 7265 | struct mddev *mddev = v; |
1da177e4 LT |
7266 | |
7267 | if (mddev && v != (void*)1 && v != (void*)2) | |
7268 | mddev_put(mddev); | |
7269 | } | |
7270 | ||
7271 | static int md_seq_show(struct seq_file *seq, void *v) | |
7272 | { | |
fd01b88c | 7273 | struct mddev *mddev = v; |
dd8ac336 | 7274 | sector_t sectors; |
3cb03002 | 7275 | struct md_rdev *rdev; |
1da177e4 LT |
7276 | |
7277 | if (v == (void*)1) { | |
84fc4b56 | 7278 | struct md_personality *pers; |
1da177e4 LT |
7279 | seq_printf(seq, "Personalities : "); |
7280 | spin_lock(&pers_lock); | |
2604b703 N |
7281 | list_for_each_entry(pers, &pers_list, list) |
7282 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
7283 | |
7284 | spin_unlock(&pers_lock); | |
7285 | seq_printf(seq, "\n"); | |
f1514638 | 7286 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
7287 | return 0; |
7288 | } | |
7289 | if (v == (void*)2) { | |
7290 | status_unused(seq); | |
7291 | return 0; | |
7292 | } | |
7293 | ||
36d091f4 | 7294 | spin_lock(&mddev->lock); |
1da177e4 LT |
7295 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
7296 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
7297 | mddev->pers ? "" : "in"); | |
7298 | if (mddev->pers) { | |
f91de92e | 7299 | if (mddev->ro==1) |
1da177e4 | 7300 | seq_printf(seq, " (read-only)"); |
f91de92e | 7301 | if (mddev->ro==2) |
52720ae7 | 7302 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
7303 | seq_printf(seq, " %s", mddev->pers->name); |
7304 | } | |
7305 | ||
dd8ac336 | 7306 | sectors = 0; |
f97fcad3 N |
7307 | rcu_read_lock(); |
7308 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 LT |
7309 | char b[BDEVNAME_SIZE]; |
7310 | seq_printf(seq, " %s[%d]", | |
7311 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
7312 | if (test_bit(WriteMostly, &rdev->flags)) |
7313 | seq_printf(seq, "(W)"); | |
b2d444d7 | 7314 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7315 | seq_printf(seq, "(F)"); |
7316 | continue; | |
2d78f8c4 N |
7317 | } |
7318 | if (rdev->raid_disk < 0) | |
b325a32e | 7319 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
7320 | if (test_bit(Replacement, &rdev->flags)) |
7321 | seq_printf(seq, "(R)"); | |
dd8ac336 | 7322 | sectors += rdev->sectors; |
1da177e4 | 7323 | } |
f97fcad3 | 7324 | rcu_read_unlock(); |
1da177e4 LT |
7325 | |
7326 | if (!list_empty(&mddev->disks)) { | |
7327 | if (mddev->pers) | |
7328 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
7329 | (unsigned long long) |
7330 | mddev->array_sectors / 2); | |
1da177e4 LT |
7331 | else |
7332 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 7333 | (unsigned long long)sectors / 2); |
1da177e4 | 7334 | } |
1cd6bf19 N |
7335 | if (mddev->persistent) { |
7336 | if (mddev->major_version != 0 || | |
7337 | mddev->minor_version != 90) { | |
7338 | seq_printf(seq," super %d.%d", | |
7339 | mddev->major_version, | |
7340 | mddev->minor_version); | |
7341 | } | |
e691063a N |
7342 | } else if (mddev->external) |
7343 | seq_printf(seq, " super external:%s", | |
7344 | mddev->metadata_type); | |
7345 | else | |
1cd6bf19 | 7346 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
7347 | |
7348 | if (mddev->pers) { | |
d710e138 | 7349 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 7350 | seq_printf(seq, "\n "); |
8e1b39d6 | 7351 | if (mddev->pers->sync_request) { |
f7851be7 | 7352 | if (status_resync(seq, mddev)) |
8e1b39d6 | 7353 | seq_printf(seq, "\n "); |
8e1b39d6 | 7354 | } |
32a7627c N |
7355 | } else |
7356 | seq_printf(seq, "\n "); | |
7357 | ||
57148964 | 7358 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7359 | |
7360 | seq_printf(seq, "\n"); | |
7361 | } | |
36d091f4 | 7362 | spin_unlock(&mddev->lock); |
f72ffdd6 | 7363 | |
1da177e4 LT |
7364 | return 0; |
7365 | } | |
7366 | ||
110518bc | 7367 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7368 | .start = md_seq_start, |
7369 | .next = md_seq_next, | |
7370 | .stop = md_seq_stop, | |
7371 | .show = md_seq_show, | |
7372 | }; | |
7373 | ||
7374 | static int md_seq_open(struct inode *inode, struct file *file) | |
7375 | { | |
f1514638 | 7376 | struct seq_file *seq; |
1da177e4 LT |
7377 | int error; |
7378 | ||
7379 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7380 | if (error) |
f1514638 KS |
7381 | return error; |
7382 | ||
7383 | seq = file->private_data; | |
7384 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7385 | return error; |
7386 | } | |
7387 | ||
e2f23b60 | 7388 | static int md_unloading; |
d7603b7e N |
7389 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7390 | { | |
f1514638 | 7391 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7392 | int mask; |
7393 | ||
e2f23b60 | 7394 | if (md_unloading) |
7d7e64f2 | 7395 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7396 | poll_wait(filp, &md_event_waiters, wait); |
7397 | ||
7398 | /* always allow read */ | |
7399 | mask = POLLIN | POLLRDNORM; | |
7400 | ||
f1514638 | 7401 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7402 | mask |= POLLERR | POLLPRI; |
7403 | return mask; | |
7404 | } | |
7405 | ||
fa027c2a | 7406 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7407 | .owner = THIS_MODULE, |
1da177e4 LT |
7408 | .open = md_seq_open, |
7409 | .read = seq_read, | |
7410 | .llseek = seq_lseek, | |
c3f94b40 | 7411 | .release = seq_release_private, |
d7603b7e | 7412 | .poll = mdstat_poll, |
1da177e4 LT |
7413 | }; |
7414 | ||
84fc4b56 | 7415 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7416 | { |
50bd3774 CY |
7417 | printk(KERN_INFO "md: %s personality registered for level %d\n", |
7418 | p->name, p->level); | |
1da177e4 | 7419 | spin_lock(&pers_lock); |
2604b703 | 7420 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7421 | spin_unlock(&pers_lock); |
7422 | return 0; | |
7423 | } | |
6c144d31 | 7424 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7425 | |
84fc4b56 | 7426 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7427 | { |
2604b703 | 7428 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7429 | spin_lock(&pers_lock); |
2604b703 | 7430 | list_del_init(&p->list); |
1da177e4 LT |
7431 | spin_unlock(&pers_lock); |
7432 | return 0; | |
7433 | } | |
6c144d31 | 7434 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7435 | |
6022e75b N |
7436 | int register_md_cluster_operations(struct md_cluster_operations *ops, |
7437 | struct module *module) | |
edb39c9d | 7438 | { |
6022e75b | 7439 | int ret = 0; |
edb39c9d | 7440 | spin_lock(&pers_lock); |
6022e75b N |
7441 | if (md_cluster_ops != NULL) |
7442 | ret = -EALREADY; | |
7443 | else { | |
7444 | md_cluster_ops = ops; | |
7445 | md_cluster_mod = module; | |
7446 | } | |
edb39c9d | 7447 | spin_unlock(&pers_lock); |
6022e75b | 7448 | return ret; |
edb39c9d GR |
7449 | } |
7450 | EXPORT_SYMBOL(register_md_cluster_operations); | |
7451 | ||
7452 | int unregister_md_cluster_operations(void) | |
7453 | { | |
7454 | spin_lock(&pers_lock); | |
7455 | md_cluster_ops = NULL; | |
7456 | spin_unlock(&pers_lock); | |
7457 | return 0; | |
7458 | } | |
7459 | EXPORT_SYMBOL(unregister_md_cluster_operations); | |
7460 | ||
7461 | int md_setup_cluster(struct mddev *mddev, int nodes) | |
7462 | { | |
7463 | int err; | |
7464 | ||
7465 | err = request_module("md-cluster"); | |
7466 | if (err) { | |
7467 | pr_err("md-cluster module not found.\n"); | |
b0c26a79 | 7468 | return -ENOENT; |
edb39c9d GR |
7469 | } |
7470 | ||
7471 | spin_lock(&pers_lock); | |
7472 | if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { | |
7473 | spin_unlock(&pers_lock); | |
7474 | return -ENOENT; | |
7475 | } | |
7476 | spin_unlock(&pers_lock); | |
7477 | ||
cf921cc1 | 7478 | return md_cluster_ops->join(mddev, nodes); |
edb39c9d GR |
7479 | } |
7480 | ||
7481 | void md_cluster_stop(struct mddev *mddev) | |
7482 | { | |
c4ce867f GR |
7483 | if (!md_cluster_ops) |
7484 | return; | |
edb39c9d GR |
7485 | md_cluster_ops->leave(mddev); |
7486 | module_put(md_cluster_mod); | |
7487 | } | |
7488 | ||
fd01b88c | 7489 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7490 | { |
f72ffdd6 | 7491 | struct md_rdev *rdev; |
1da177e4 | 7492 | int idle; |
eea1bf38 | 7493 | int curr_events; |
1da177e4 LT |
7494 | |
7495 | idle = 1; | |
4b80991c N |
7496 | rcu_read_lock(); |
7497 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7498 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7499 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7500 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7501 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7502 | /* sync IO will cause sync_io to increase before the disk_stats |
7503 | * as sync_io is counted when a request starts, and | |
7504 | * disk_stats is counted when it completes. | |
7505 | * So resync activity will cause curr_events to be smaller than | |
7506 | * when there was no such activity. | |
7507 | * non-sync IO will cause disk_stat to increase without | |
7508 | * increasing sync_io so curr_events will (eventually) | |
7509 | * be larger than it was before. Once it becomes | |
7510 | * substantially larger, the test below will cause | |
7511 | * the array to appear non-idle, and resync will slow | |
7512 | * down. | |
7513 | * If there is a lot of outstanding resync activity when | |
7514 | * we set last_event to curr_events, then all that activity | |
7515 | * completing might cause the array to appear non-idle | |
7516 | * and resync will be slowed down even though there might | |
7517 | * not have been non-resync activity. This will only | |
7518 | * happen once though. 'last_events' will soon reflect | |
7519 | * the state where there is little or no outstanding | |
7520 | * resync requests, and further resync activity will | |
7521 | * always make curr_events less than last_events. | |
c0e48521 | 7522 | * |
1da177e4 | 7523 | */ |
eea1bf38 | 7524 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7525 | rdev->last_events = curr_events; |
7526 | idle = 0; | |
7527 | } | |
7528 | } | |
4b80991c | 7529 | rcu_read_unlock(); |
1da177e4 LT |
7530 | return idle; |
7531 | } | |
7532 | ||
fd01b88c | 7533 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7534 | { |
7535 | /* another "blocks" (512byte) blocks have been synced */ | |
7536 | atomic_sub(blocks, &mddev->recovery_active); | |
7537 | wake_up(&mddev->recovery_wait); | |
7538 | if (!ok) { | |
dfc70645 | 7539 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7540 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7541 | md_wakeup_thread(mddev->thread); |
7542 | // stop recovery, signal do_sync .... | |
7543 | } | |
7544 | } | |
6c144d31 | 7545 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 7546 | |
06d91a5f N |
7547 | /* md_write_start(mddev, bi) |
7548 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7549 | * in superblock) before writing, schedule a superblock update |
7550 | * and wait for it to complete. | |
06d91a5f | 7551 | */ |
fd01b88c | 7552 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7553 | { |
0fd62b86 | 7554 | int did_change = 0; |
06d91a5f | 7555 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7556 | return; |
06d91a5f | 7557 | |
f91de92e N |
7558 | BUG_ON(mddev->ro == 1); |
7559 | if (mddev->ro == 2) { | |
7560 | /* need to switch to read/write */ | |
7561 | mddev->ro = 0; | |
7562 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7563 | md_wakeup_thread(mddev->thread); | |
25156198 | 7564 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7565 | did_change = 1; |
f91de92e | 7566 | } |
06d91a5f | 7567 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7568 | if (mddev->safemode == 1) |
7569 | mddev->safemode = 0; | |
06d91a5f | 7570 | if (mddev->in_sync) { |
85572d7c | 7571 | spin_lock(&mddev->lock); |
3d310eb7 N |
7572 | if (mddev->in_sync) { |
7573 | mddev->in_sync = 0; | |
850b2b42 | 7574 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7575 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7576 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7577 | did_change = 1; |
3d310eb7 | 7578 | } |
85572d7c | 7579 | spin_unlock(&mddev->lock); |
06d91a5f | 7580 | } |
0fd62b86 | 7581 | if (did_change) |
00bcb4ac | 7582 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7583 | wait_event(mddev->sb_wait, |
09a44cc1 | 7584 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 | 7585 | } |
6c144d31 | 7586 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 7587 | |
fd01b88c | 7588 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7589 | { |
7590 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7591 | if (mddev->safemode == 2) | |
7592 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7593 | else if (mddev->safemode_delay) |
1da177e4 LT |
7594 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7595 | } | |
7596 | } | |
6c144d31 | 7597 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 7598 | |
2a2275d6 N |
7599 | /* md_allow_write(mddev) |
7600 | * Calling this ensures that the array is marked 'active' so that writes | |
7601 | * may proceed without blocking. It is important to call this before | |
7602 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7603 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7604 | * |
7605 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7606 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7607 | */ |
fd01b88c | 7608 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7609 | { |
7610 | if (!mddev->pers) | |
b5470dc5 | 7611 | return 0; |
2a2275d6 | 7612 | if (mddev->ro) |
b5470dc5 | 7613 | return 0; |
1a0fd497 | 7614 | if (!mddev->pers->sync_request) |
b5470dc5 | 7615 | return 0; |
2a2275d6 | 7616 | |
85572d7c | 7617 | spin_lock(&mddev->lock); |
2a2275d6 N |
7618 | if (mddev->in_sync) { |
7619 | mddev->in_sync = 0; | |
7620 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7621 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7622 | if (mddev->safemode_delay && |
7623 | mddev->safemode == 0) | |
7624 | mddev->safemode = 1; | |
85572d7c | 7625 | spin_unlock(&mddev->lock); |
2a2275d6 | 7626 | md_update_sb(mddev, 0); |
00bcb4ac | 7627 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 | 7628 | } else |
85572d7c | 7629 | spin_unlock(&mddev->lock); |
b5470dc5 | 7630 | |
070dc6dd | 7631 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7632 | return -EAGAIN; |
7633 | else | |
7634 | return 0; | |
2a2275d6 N |
7635 | } |
7636 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7637 | ||
1da177e4 LT |
7638 | #define SYNC_MARKS 10 |
7639 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7640 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7641 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7642 | { |
4ed8731d | 7643 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7644 | struct mddev *mddev2; |
1da177e4 LT |
7645 | unsigned int currspeed = 0, |
7646 | window; | |
ac7e50a3 | 7647 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 7648 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7649 | unsigned long update_time; |
1da177e4 LT |
7650 | sector_t mark_cnt[SYNC_MARKS]; |
7651 | int last_mark,m; | |
7652 | struct list_head *tmp; | |
7653 | sector_t last_check; | |
57afd89f | 7654 | int skipped = 0; |
3cb03002 | 7655 | struct md_rdev *rdev; |
c4a39551 | 7656 | char *desc, *action = NULL; |
7c2c57c9 | 7657 | struct blk_plug plug; |
c186b128 | 7658 | bool cluster_resync_finished = false; |
1da177e4 LT |
7659 | |
7660 | /* just incase thread restarts... */ | |
7661 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7662 | return; | |
3991b31e N |
7663 | if (mddev->ro) {/* never try to sync a read-only array */ |
7664 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 7665 | return; |
3991b31e | 7666 | } |
1da177e4 | 7667 | |
61df9d91 | 7668 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 7669 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 7670 | desc = "data-check"; |
c4a39551 JB |
7671 | action = "check"; |
7672 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 7673 | desc = "requested-resync"; |
c4a39551 JB |
7674 | action = "repair"; |
7675 | } else | |
61df9d91 N |
7676 | desc = "resync"; |
7677 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7678 | desc = "reshape"; | |
7679 | else | |
7680 | desc = "recovery"; | |
7681 | ||
c4a39551 JB |
7682 | mddev->last_sync_action = action ?: desc; |
7683 | ||
1da177e4 LT |
7684 | /* we overload curr_resync somewhat here. |
7685 | * 0 == not engaged in resync at all | |
7686 | * 2 == checking that there is no conflict with another sync | |
7687 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7688 | * commense | |
7689 | * other == active in resync - this many blocks | |
7690 | * | |
7691 | * Before starting a resync we must have set curr_resync to | |
7692 | * 2, and then checked that every "conflicting" array has curr_resync | |
7693 | * less than ours. When we find one that is the same or higher | |
7694 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7695 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7696 | * This will mean we have to start checking from the beginning again. | |
7697 | * | |
7698 | */ | |
7699 | ||
7700 | do { | |
7701 | mddev->curr_resync = 2; | |
7702 | ||
7703 | try_again: | |
404e4b43 | 7704 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 7705 | goto skip; |
29ac4aa3 | 7706 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7707 | if (mddev2 == mddev) |
7708 | continue; | |
90b08710 BS |
7709 | if (!mddev->parallel_resync |
7710 | && mddev2->curr_resync | |
7711 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7712 | DEFINE_WAIT(wq); |
7713 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7714 | /* arbitrarily yield */ | |
7715 | mddev->curr_resync = 1; | |
7716 | wake_up(&resync_wait); | |
7717 | } | |
7718 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7719 | /* no need to wait here, we can wait the next | |
7720 | * time 'round when curr_resync == 2 | |
7721 | */ | |
7722 | continue; | |
9744197c N |
7723 | /* We need to wait 'interruptible' so as not to |
7724 | * contribute to the load average, and not to | |
7725 | * be caught by 'softlockup' | |
7726 | */ | |
7727 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 7728 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 7729 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7730 | printk(KERN_INFO "md: delaying %s of %s" |
7731 | " until %s has finished (they" | |
1da177e4 | 7732 | " share one or more physical units)\n", |
61df9d91 | 7733 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7734 | mddev_put(mddev2); |
9744197c N |
7735 | if (signal_pending(current)) |
7736 | flush_signals(current); | |
1da177e4 LT |
7737 | schedule(); |
7738 | finish_wait(&resync_wait, &wq); | |
7739 | goto try_again; | |
7740 | } | |
7741 | finish_wait(&resync_wait, &wq); | |
7742 | } | |
7743 | } | |
7744 | } while (mddev->curr_resync < 2); | |
7745 | ||
5fd6c1dc | 7746 | j = 0; |
9d88883e | 7747 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7748 | /* resync follows the size requested by the personality, |
57afd89f | 7749 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7750 | */ |
7751 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7752 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7753 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7754 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7755 | j = mddev->resync_min; | |
7756 | else if (!mddev->bitmap) | |
5fd6c1dc | 7757 | j = mddev->recovery_cp; |
5e96ee65 | 7758 | |
ccfcc3c1 | 7759 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7760 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7761 | else { |
1da177e4 | 7762 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7763 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7764 | j = MaxSector; |
4e59ca7d | 7765 | rcu_read_lock(); |
dafb20fa | 7766 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc N |
7767 | if (rdev->raid_disk >= 0 && |
7768 | !test_bit(Faulty, &rdev->flags) && | |
7769 | !test_bit(In_sync, &rdev->flags) && | |
7770 | rdev->recovery_offset < j) | |
7771 | j = rdev->recovery_offset; | |
4e59ca7d | 7772 | rcu_read_unlock(); |
133d4527 N |
7773 | |
7774 | /* If there is a bitmap, we need to make sure all | |
7775 | * writes that started before we added a spare | |
7776 | * complete before we start doing a recovery. | |
7777 | * Otherwise the write might complete and (via | |
7778 | * bitmap_endwrite) set a bit in the bitmap after the | |
7779 | * recovery has checked that bit and skipped that | |
7780 | * region. | |
7781 | */ | |
7782 | if (mddev->bitmap) { | |
7783 | mddev->pers->quiesce(mddev, 1); | |
7784 | mddev->pers->quiesce(mddev, 0); | |
7785 | } | |
5fd6c1dc | 7786 | } |
1da177e4 | 7787 | |
61df9d91 N |
7788 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7789 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7790 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7791 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7792 | "(but not more than %d KB/sec) for %s.\n", |
7793 | speed_max(mddev), desc); | |
1da177e4 | 7794 | |
eea1bf38 | 7795 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7796 | |
57afd89f | 7797 | io_sectors = 0; |
1da177e4 LT |
7798 | for (m = 0; m < SYNC_MARKS; m++) { |
7799 | mark[m] = jiffies; | |
57afd89f | 7800 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7801 | } |
7802 | last_mark = 0; | |
7803 | mddev->resync_mark = mark[last_mark]; | |
7804 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7805 | ||
7806 | /* | |
7807 | * Tune reconstruction: | |
7808 | */ | |
7809 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7810 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7811 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7812 | |
7813 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7814 | last_check = 0; |
7815 | ||
7816 | if (j>2) { | |
c91abf5a | 7817 | printk(KERN_INFO |
61df9d91 N |
7818 | "md: resuming %s of %s from checkpoint.\n", |
7819 | desc, mdname(mddev)); | |
1da177e4 | 7820 | mddev->curr_resync = j; |
72f36d59 N |
7821 | } else |
7822 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7823 | mddev->curr_resync_completed = j; |
72f36d59 N |
7824 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7825 | md_new_event(mddev); | |
54f89341 | 7826 | update_time = jiffies; |
1da177e4 | 7827 | |
7c2c57c9 | 7828 | blk_start_plug(&plug); |
1da177e4 | 7829 | while (j < max_sectors) { |
57afd89f | 7830 | sector_t sectors; |
1da177e4 | 7831 | |
57afd89f | 7832 | skipped = 0; |
97e4f42d | 7833 | |
7a91ee1f N |
7834 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7835 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7836 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7837 | > (max_sectors >> 4)) || | |
54f89341 | 7838 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f | 7839 | (j - mddev->curr_resync_completed)*2 |
c5e19d90 N |
7840 | >= mddev->resync_max - mddev->curr_resync_completed || |
7841 | mddev->curr_resync_completed > mddev->resync_max | |
7a91ee1f | 7842 | )) { |
97e4f42d | 7843 | /* time to update curr_resync_completed */ |
97e4f42d N |
7844 | wait_event(mddev->recovery_wait, |
7845 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7846 | mddev->curr_resync_completed = j; |
35d78c66 | 7847 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
7848 | j > mddev->recovery_cp) | |
7849 | mddev->recovery_cp = j; | |
54f89341 | 7850 | update_time = jiffies; |
070dc6dd | 7851 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7852 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7853 | } |
acb180b0 | 7854 | |
c91abf5a N |
7855 | while (j >= mddev->resync_max && |
7856 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
7857 | /* As this condition is controlled by user-space, |
7858 | * we can block indefinitely, so use '_interruptible' | |
7859 | * to avoid triggering warnings. | |
7860 | */ | |
7861 | flush_signals(current); /* just in case */ | |
7862 | wait_event_interruptible(mddev->recovery_wait, | |
7863 | mddev->resync_max > j | |
c91abf5a N |
7864 | || test_bit(MD_RECOVERY_INTR, |
7865 | &mddev->recovery)); | |
e62e58a5 | 7866 | } |
acb180b0 | 7867 | |
c91abf5a N |
7868 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7869 | break; | |
acb180b0 | 7870 | |
09314799 | 7871 | sectors = mddev->pers->sync_request(mddev, j, &skipped); |
57afd89f | 7872 | if (sectors == 0) { |
dfc70645 | 7873 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 7874 | break; |
1da177e4 | 7875 | } |
57afd89f N |
7876 | |
7877 | if (!skipped) { /* actual IO requested */ | |
7878 | io_sectors += sectors; | |
7879 | atomic_add(sectors, &mddev->recovery_active); | |
7880 | } | |
7881 | ||
e875ecea N |
7882 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7883 | break; | |
7884 | ||
1da177e4 | 7885 | j += sectors; |
5ed1df2e N |
7886 | if (j > max_sectors) |
7887 | /* when skipping, extra large numbers can be returned. */ | |
7888 | j = max_sectors; | |
72f36d59 N |
7889 | if (j > 2) |
7890 | mddev->curr_resync = j; | |
ff4e8d9a | 7891 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7892 | if (last_check == 0) |
e875ecea | 7893 | /* this is the earliest that rebuild will be |
d7603b7e N |
7894 | * visible in /proc/mdstat |
7895 | */ | |
7896 | md_new_event(mddev); | |
57afd89f N |
7897 | |
7898 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7899 | continue; |
7900 | ||
57afd89f | 7901 | last_check = io_sectors; |
1da177e4 LT |
7902 | repeat: |
7903 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7904 | /* step marks */ | |
7905 | int next = (last_mark+1) % SYNC_MARKS; | |
7906 | ||
7907 | mddev->resync_mark = mark[next]; | |
7908 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7909 | mark[next] = jiffies; | |
57afd89f | 7910 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7911 | last_mark = next; |
7912 | } | |
7913 | ||
c91abf5a N |
7914 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7915 | break; | |
1da177e4 LT |
7916 | |
7917 | /* | |
7918 | * this loop exits only if either when we are slower than | |
7919 | * the 'hard' speed limit, or the system was IO-idle for | |
7920 | * a jiffy. | |
7921 | * the system might be non-idle CPU-wise, but we only care | |
7922 | * about not overloading the IO subsystem. (things like an | |
7923 | * e2fsck being done on the RAID array should execute fast) | |
7924 | */ | |
1da177e4 LT |
7925 | cond_resched(); |
7926 | ||
ac7e50a3 XN |
7927 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
7928 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 7929 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 7930 | |
88202a0c | 7931 | if (currspeed > speed_min(mddev)) { |
ac8fa419 | 7932 | if (currspeed > speed_max(mddev)) { |
c0e48521 | 7933 | msleep(500); |
1da177e4 LT |
7934 | goto repeat; |
7935 | } | |
ac8fa419 N |
7936 | if (!is_mddev_idle(mddev, 0)) { |
7937 | /* | |
7938 | * Give other IO more of a chance. | |
7939 | * The faster the devices, the less we wait. | |
7940 | */ | |
7941 | wait_event(mddev->recovery_wait, | |
7942 | !atomic_read(&mddev->recovery_active)); | |
7943 | } | |
1da177e4 LT |
7944 | } |
7945 | } | |
c91abf5a N |
7946 | printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
7947 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
7948 | ? "interrupted" : "done"); | |
1da177e4 LT |
7949 | /* |
7950 | * this also signals 'finished resyncing' to md_stop | |
7951 | */ | |
7c2c57c9 | 7952 | blk_finish_plug(&plug); |
1da177e4 LT |
7953 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7954 | ||
5ed1df2e N |
7955 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7956 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7957 | mddev->curr_resync > 2) { | |
7958 | mddev->curr_resync_completed = mddev->curr_resync; | |
7959 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
7960 | } | |
c186b128 GR |
7961 | /* tell personality and other nodes that we are finished */ |
7962 | if (mddev_is_clustered(mddev)) { | |
7963 | md_cluster_ops->resync_finish(mddev); | |
7964 | cluster_resync_finished = true; | |
7965 | } | |
09314799 | 7966 | mddev->pers->sync_request(mddev, max_sectors, &skipped); |
1da177e4 | 7967 | |
dfc70645 | 7968 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7969 | mddev->curr_resync > 2) { |
7970 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7971 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7972 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7973 | printk(KERN_INFO | |
61df9d91 N |
7974 | "md: checkpointing %s of %s.\n", |
7975 | desc, mdname(mddev)); | |
0a19caab | 7976 | if (test_bit(MD_RECOVERY_ERROR, |
7977 | &mddev->recovery)) | |
7978 | mddev->recovery_cp = | |
7979 | mddev->curr_resync_completed; | |
7980 | else | |
7981 | mddev->recovery_cp = | |
7982 | mddev->curr_resync; | |
5fd6c1dc N |
7983 | } |
7984 | } else | |
7985 | mddev->recovery_cp = MaxSector; | |
7986 | } else { | |
7987 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7988 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 7989 | rcu_read_lock(); |
dafb20fa | 7990 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7991 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7992 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7993 | !test_bit(Faulty, &rdev->flags) && |
7994 | !test_bit(In_sync, &rdev->flags) && | |
7995 | rdev->recovery_offset < mddev->curr_resync) | |
7996 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7997 | rcu_read_unlock(); |
5fd6c1dc | 7998 | } |
1da177e4 | 7999 | } |
db91ff55 | 8000 | skip: |
17571284 | 8001 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 8002 | |
c186b128 GR |
8003 | if (mddev_is_clustered(mddev) && |
8004 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8005 | !cluster_resync_finished) | |
8006 | md_cluster_ops->resync_finish(mddev); | |
8007 | ||
23da422b | 8008 | spin_lock(&mddev->lock); |
c07b70ad N |
8009 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
8010 | /* We completed so min/max setting can be forgotten if used. */ | |
8011 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
8012 | mddev->resync_min = 0; | |
8013 | mddev->resync_max = MaxSector; | |
8014 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
8015 | mddev->resync_min = mddev->curr_resync_completed; | |
f7851be7 | 8016 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); |
1da177e4 | 8017 | mddev->curr_resync = 0; |
23da422b N |
8018 | spin_unlock(&mddev->lock); |
8019 | ||
1da177e4 | 8020 | wake_up(&resync_wait); |
1da177e4 | 8021 | md_wakeup_thread(mddev->thread); |
c6207277 | 8022 | return; |
1da177e4 | 8023 | } |
29269553 | 8024 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 8025 | |
746d3207 N |
8026 | static int remove_and_add_spares(struct mddev *mddev, |
8027 | struct md_rdev *this) | |
b4c4c7b8 | 8028 | { |
3cb03002 | 8029 | struct md_rdev *rdev; |
b4c4c7b8 | 8030 | int spares = 0; |
f2a371c5 | 8031 | int removed = 0; |
b4c4c7b8 | 8032 | |
dafb20fa | 8033 | rdev_for_each(rdev, mddev) |
746d3207 N |
8034 | if ((this == NULL || rdev == this) && |
8035 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 8036 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
8037 | (test_bit(Faulty, &rdev->flags) || |
8038 | ! test_bit(In_sync, &rdev->flags)) && | |
8039 | atomic_read(&rdev->nr_pending)==0) { | |
8040 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 8041 | mddev, rdev) == 0) { |
36fad858 | 8042 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 8043 | rdev->raid_disk = -1; |
f2a371c5 | 8044 | removed++; |
b4c4c7b8 N |
8045 | } |
8046 | } | |
90584fc9 JB |
8047 | if (removed && mddev->kobj.sd) |
8048 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 8049 | |
2910ff17 | 8050 | if (this && removed) |
746d3207 N |
8051 | goto no_add; |
8052 | ||
dafb20fa | 8053 | rdev_for_each(rdev, mddev) { |
2910ff17 GR |
8054 | if (this && this != rdev) |
8055 | continue; | |
dbb64f86 GR |
8056 | if (test_bit(Candidate, &rdev->flags)) |
8057 | continue; | |
7bfec5f3 N |
8058 | if (rdev->raid_disk >= 0 && |
8059 | !test_bit(In_sync, &rdev->flags) && | |
8060 | !test_bit(Faulty, &rdev->flags)) | |
8061 | spares++; | |
7ceb17e8 N |
8062 | if (rdev->raid_disk >= 0) |
8063 | continue; | |
8064 | if (test_bit(Faulty, &rdev->flags)) | |
8065 | continue; | |
8066 | if (mddev->ro && | |
8313b8e5 N |
8067 | ! (rdev->saved_raid_disk >= 0 && |
8068 | !test_bit(Bitmap_sync, &rdev->flags))) | |
7ceb17e8 N |
8069 | continue; |
8070 | ||
7eb41885 N |
8071 | if (rdev->saved_raid_disk < 0) |
8072 | rdev->recovery_offset = 0; | |
7ceb17e8 N |
8073 | if (mddev->pers-> |
8074 | hot_add_disk(mddev, rdev) == 0) { | |
8075 | if (sysfs_link_rdev(mddev, rdev)) | |
8076 | /* failure here is OK */; | |
8077 | spares++; | |
8078 | md_new_event(mddev); | |
8079 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 8080 | } |
b4c4c7b8 | 8081 | } |
746d3207 | 8082 | no_add: |
6dafab6b N |
8083 | if (removed) |
8084 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
8085 | return spares; |
8086 | } | |
7ebc0be7 | 8087 | |
ac05f256 N |
8088 | static void md_start_sync(struct work_struct *ws) |
8089 | { | |
8090 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
c186b128 GR |
8091 | int ret = 0; |
8092 | ||
8093 | if (mddev_is_clustered(mddev)) { | |
8094 | ret = md_cluster_ops->resync_start(mddev); | |
8095 | if (ret) { | |
8096 | mddev->sync_thread = NULL; | |
8097 | goto out; | |
8098 | } | |
8099 | } | |
ac05f256 N |
8100 | |
8101 | mddev->sync_thread = md_register_thread(md_do_sync, | |
8102 | mddev, | |
8103 | "resync"); | |
c186b128 | 8104 | out: |
ac05f256 | 8105 | if (!mddev->sync_thread) { |
c186b128 GR |
8106 | if (!(mddev_is_clustered(mddev) && ret == -EAGAIN)) |
8107 | printk(KERN_ERR "%s: could not start resync" | |
8108 | " thread...\n", | |
8109 | mdname(mddev)); | |
ac05f256 N |
8110 | /* leave the spares where they are, it shouldn't hurt */ |
8111 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
8112 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8113 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8114 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
8115 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8116 | wake_up(&resync_wait); |
ac05f256 N |
8117 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8118 | &mddev->recovery)) | |
8119 | if (mddev->sysfs_action) | |
8120 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8121 | } else | |
8122 | md_wakeup_thread(mddev->sync_thread); | |
8123 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8124 | md_new_event(mddev); | |
8125 | } | |
8126 | ||
1da177e4 LT |
8127 | /* |
8128 | * This routine is regularly called by all per-raid-array threads to | |
8129 | * deal with generic issues like resync and super-block update. | |
8130 | * Raid personalities that don't have a thread (linear/raid0) do not | |
8131 | * need this as they never do any recovery or update the superblock. | |
8132 | * | |
8133 | * It does not do any resync itself, but rather "forks" off other threads | |
8134 | * to do that as needed. | |
8135 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
8136 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 8137 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
8138 | * and wakeups up this thread which will reap the thread and finish up. |
8139 | * This thread also removes any faulty devices (with nr_pending == 0). | |
8140 | * | |
8141 | * The overall approach is: | |
8142 | * 1/ if the superblock needs updating, update it. | |
8143 | * 2/ If a recovery thread is running, don't do anything else. | |
8144 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
8145 | * 4/ If there are any faulty devices, remove them. | |
8146 | * 5/ If array is degraded, try to add spares devices | |
8147 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
8148 | */ | |
fd01b88c | 8149 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 8150 | { |
68866e42 JB |
8151 | if (mddev->suspended) |
8152 | return; | |
8153 | ||
5f40402d | 8154 | if (mddev->bitmap) |
aa5cbd10 | 8155 | bitmap_daemon_work(mddev); |
1da177e4 | 8156 | |
fca4d848 | 8157 | if (signal_pending(current)) { |
31a59e34 | 8158 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
8159 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
8160 | mdname(mddev)); | |
8161 | mddev->safemode = 2; | |
8162 | } | |
8163 | flush_signals(current); | |
8164 | } | |
8165 | ||
c89a8eee N |
8166 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
8167 | return; | |
1da177e4 | 8168 | if ( ! ( |
142d44c3 | 8169 | (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 8170 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 8171 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 8172 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
8173 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
8174 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
8175 | )) |
8176 | return; | |
fca4d848 | 8177 | |
df5b89b3 | 8178 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 8179 | int spares = 0; |
fca4d848 | 8180 | |
c89a8eee | 8181 | if (mddev->ro) { |
ab16bfc7 NB |
8182 | struct md_rdev *rdev; |
8183 | if (!mddev->external && mddev->in_sync) | |
8184 | /* 'Blocked' flag not needed as failed devices | |
8185 | * will be recorded if array switched to read/write. | |
8186 | * Leaving it set will prevent the device | |
8187 | * from being removed. | |
8188 | */ | |
8189 | rdev_for_each(rdev, mddev) | |
8190 | clear_bit(Blocked, &rdev->flags); | |
7ceb17e8 N |
8191 | /* On a read-only array we can: |
8192 | * - remove failed devices | |
8193 | * - add already-in_sync devices if the array itself | |
8194 | * is in-sync. | |
8195 | * As we only add devices that are already in-sync, | |
8196 | * we can activate the spares immediately. | |
c89a8eee | 8197 | */ |
7ceb17e8 | 8198 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
8199 | /* There is no thread, but we need to call |
8200 | * ->spare_active and clear saved_raid_disk | |
8201 | */ | |
2ac295a5 | 8202 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 | 8203 | md_reap_sync_thread(mddev); |
a4a3d26d | 8204 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
8313b8e5 | 8205 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
d4929add | 8206 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
c89a8eee N |
8207 | goto unlock; |
8208 | } | |
8209 | ||
31a59e34 | 8210 | if (!mddev->external) { |
0fd62b86 | 8211 | int did_change = 0; |
85572d7c | 8212 | spin_lock(&mddev->lock); |
31a59e34 N |
8213 | if (mddev->safemode && |
8214 | !atomic_read(&mddev->writes_pending) && | |
8215 | !mddev->in_sync && | |
8216 | mddev->recovery_cp == MaxSector) { | |
8217 | mddev->in_sync = 1; | |
0fd62b86 | 8218 | did_change = 1; |
070dc6dd | 8219 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
8220 | } |
8221 | if (mddev->safemode == 1) | |
8222 | mddev->safemode = 0; | |
85572d7c | 8223 | spin_unlock(&mddev->lock); |
0fd62b86 | 8224 | if (did_change) |
00bcb4ac | 8225 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 8226 | } |
fca4d848 | 8227 | |
2aa82191 | 8228 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 8229 | md_update_sb(mddev, 0); |
06d91a5f | 8230 | |
1da177e4 LT |
8231 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
8232 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
8233 | /* resync/recovery still happening */ | |
8234 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8235 | goto unlock; | |
8236 | } | |
8237 | if (mddev->sync_thread) { | |
a91d5ac0 | 8238 | md_reap_sync_thread(mddev); |
1da177e4 LT |
8239 | goto unlock; |
8240 | } | |
72a23c21 NB |
8241 | /* Set RUNNING before clearing NEEDED to avoid |
8242 | * any transients in the value of "sync_action". | |
8243 | */ | |
72f36d59 | 8244 | mddev->curr_resync_completed = 0; |
23da422b | 8245 | spin_lock(&mddev->lock); |
72a23c21 | 8246 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
23da422b | 8247 | spin_unlock(&mddev->lock); |
24dd469d N |
8248 | /* Clear some bits that don't mean anything, but |
8249 | * might be left set | |
8250 | */ | |
24dd469d N |
8251 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8252 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 8253 | |
ed209584 N |
8254 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
8255 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 8256 | goto not_running; |
1da177e4 LT |
8257 | /* no recovery is running. |
8258 | * remove any failed drives, then | |
8259 | * add spares if possible. | |
72f36d59 | 8260 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
8261 | * the personality to fail the re-add. |
8262 | */ | |
1da177e4 | 8263 | |
b4c4c7b8 | 8264 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
8265 | if (mddev->pers->check_reshape == NULL || |
8266 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 8267 | /* Cannot proceed */ |
ac05f256 | 8268 | goto not_running; |
b4c4c7b8 | 8269 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 8270 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 8271 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
8272 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8273 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 8274 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 8275 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8276 | } else if (mddev->recovery_cp < MaxSector) { |
8277 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 8278 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8279 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
8280 | /* nothing to be done ... */ | |
ac05f256 | 8281 | goto not_running; |
24dd469d | 8282 | |
1da177e4 | 8283 | if (mddev->pers->sync_request) { |
ef99bf48 | 8284 | if (spares) { |
a654b9d8 N |
8285 | /* We are adding a device or devices to an array |
8286 | * which has the bitmap stored on all devices. | |
8287 | * So make sure all bitmap pages get written | |
8288 | */ | |
8289 | bitmap_write_all(mddev->bitmap); | |
8290 | } | |
ac05f256 N |
8291 | INIT_WORK(&mddev->del_work, md_start_sync); |
8292 | queue_work(md_misc_wq, &mddev->del_work); | |
8293 | goto unlock; | |
1da177e4 | 8294 | } |
ac05f256 | 8295 | not_running: |
72a23c21 NB |
8296 | if (!mddev->sync_thread) { |
8297 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8298 | wake_up(&resync_wait); |
72a23c21 NB |
8299 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8300 | &mddev->recovery)) | |
0c3573f1 | 8301 | if (mddev->sysfs_action) |
00bcb4ac | 8302 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 8303 | } |
ac05f256 N |
8304 | unlock: |
8305 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
8306 | mddev_unlock(mddev); |
8307 | } | |
8308 | } | |
6c144d31 | 8309 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 8310 | |
a91d5ac0 JB |
8311 | void md_reap_sync_thread(struct mddev *mddev) |
8312 | { | |
8313 | struct md_rdev *rdev; | |
8314 | ||
8315 | /* resync has finished, collect result */ | |
8316 | md_unregister_thread(&mddev->sync_thread); | |
8317 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8318 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
8319 | /* success...*/ | |
8320 | /* activate any spares */ | |
8321 | if (mddev->pers->spare_active(mddev)) { | |
8322 | sysfs_notify(&mddev->kobj, NULL, | |
8323 | "degraded"); | |
8324 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
8325 | } | |
8326 | } | |
8327 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
8328 | mddev->pers->finish_reshape) | |
8329 | mddev->pers->finish_reshape(mddev); | |
8330 | ||
8331 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 8332 | * information must be scrapped. |
a91d5ac0 | 8333 | */ |
f466722c N |
8334 | if (!mddev->degraded) |
8335 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
8336 | rdev->saved_raid_disk = -1; |
8337 | ||
8338 | md_update_sb(mddev, 1); | |
8339 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
ea358cd0 | 8340 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
a91d5ac0 JB |
8341 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8342 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8343 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8344 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 8345 | wake_up(&resync_wait); |
a91d5ac0 JB |
8346 | /* flag recovery needed just to double check */ |
8347 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8348 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8349 | md_new_event(mddev); | |
8350 | if (mddev->event_work.func) | |
8351 | queue_work(md_misc_wq, &mddev->event_work); | |
8352 | } | |
6c144d31 | 8353 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 8354 | |
fd01b88c | 8355 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 8356 | { |
00bcb4ac | 8357 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 8358 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
8359 | !test_bit(Blocked, &rdev->flags) && |
8360 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
8361 | msecs_to_jiffies(5000)); |
8362 | rdev_dec_pending(rdev, mddev); | |
8363 | } | |
8364 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
8365 | ||
c6563a8c N |
8366 | void md_finish_reshape(struct mddev *mddev) |
8367 | { | |
8368 | /* called be personality module when reshape completes. */ | |
8369 | struct md_rdev *rdev; | |
8370 | ||
8371 | rdev_for_each(rdev, mddev) { | |
8372 | if (rdev->data_offset > rdev->new_data_offset) | |
8373 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
8374 | else | |
8375 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
8376 | rdev->data_offset = rdev->new_data_offset; | |
8377 | } | |
8378 | } | |
8379 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
8380 | |
8381 | /* Bad block management. | |
8382 | * We can record which blocks on each device are 'bad' and so just | |
8383 | * fail those blocks, or that stripe, rather than the whole device. | |
8384 | * Entries in the bad-block table are 64bits wide. This comprises: | |
8385 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
8386 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
8387 | * A 'shift' can be set so that larger blocks are tracked and | |
8388 | * consequently larger devices can be covered. | |
8389 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
8390 | * | |
8391 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
8392 | * might need to retry if it is very unlucky. | |
8393 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
8394 | * so we use the write_seqlock_irq variant. | |
8395 | * | |
8396 | * When looking for a bad block we specify a range and want to | |
8397 | * know if any block in the range is bad. So we binary-search | |
8398 | * to the last range that starts at-or-before the given endpoint, | |
8399 | * (or "before the sector after the target range") | |
8400 | * then see if it ends after the given start. | |
8401 | * We return | |
8402 | * 0 if there are no known bad blocks in the range | |
8403 | * 1 if there are known bad block which are all acknowledged | |
8404 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
8405 | * plus the start/length of the first bad section we overlap. | |
8406 | */ | |
8407 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
8408 | sector_t *first_bad, int *bad_sectors) | |
8409 | { | |
8410 | int hi; | |
ab05613a | 8411 | int lo; |
2230dfe4 | 8412 | u64 *p = bb->page; |
ab05613a | 8413 | int rv; |
2230dfe4 N |
8414 | sector_t target = s + sectors; |
8415 | unsigned seq; | |
8416 | ||
8417 | if (bb->shift > 0) { | |
8418 | /* round the start down, and the end up */ | |
8419 | s >>= bb->shift; | |
8420 | target += (1<<bb->shift) - 1; | |
8421 | target >>= bb->shift; | |
8422 | sectors = target - s; | |
8423 | } | |
8424 | /* 'target' is now the first block after the bad range */ | |
8425 | ||
8426 | retry: | |
8427 | seq = read_seqbegin(&bb->lock); | |
ab05613a | 8428 | lo = 0; |
8429 | rv = 0; | |
2230dfe4 N |
8430 | hi = bb->count; |
8431 | ||
8432 | /* Binary search between lo and hi for 'target' | |
8433 | * i.e. for the last range that starts before 'target' | |
8434 | */ | |
8435 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
8436 | * are known not to be the last range before target. | |
8437 | * VARIANT: hi-lo is the number of possible | |
8438 | * ranges, and decreases until it reaches 1 | |
8439 | */ | |
8440 | while (hi - lo > 1) { | |
8441 | int mid = (lo + hi) / 2; | |
8442 | sector_t a = BB_OFFSET(p[mid]); | |
8443 | if (a < target) | |
8444 | /* This could still be the one, earlier ranges | |
8445 | * could not. */ | |
8446 | lo = mid; | |
8447 | else | |
8448 | /* This and later ranges are definitely out. */ | |
8449 | hi = mid; | |
8450 | } | |
8451 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
8452 | if (hi > lo) { | |
8453 | /* need to check all range that end after 's' to see if | |
8454 | * any are unacknowledged. | |
8455 | */ | |
8456 | while (lo >= 0 && | |
8457 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8458 | if (BB_OFFSET(p[lo]) < target) { | |
8459 | /* starts before the end, and finishes after | |
8460 | * the start, so they must overlap | |
8461 | */ | |
8462 | if (rv != -1 && BB_ACK(p[lo])) | |
8463 | rv = 1; | |
8464 | else | |
8465 | rv = -1; | |
8466 | *first_bad = BB_OFFSET(p[lo]); | |
8467 | *bad_sectors = BB_LEN(p[lo]); | |
8468 | } | |
8469 | lo--; | |
8470 | } | |
8471 | } | |
8472 | ||
8473 | if (read_seqretry(&bb->lock, seq)) | |
8474 | goto retry; | |
8475 | ||
8476 | return rv; | |
8477 | } | |
8478 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
8479 | ||
8480 | /* | |
8481 | * Add a range of bad blocks to the table. | |
8482 | * This might extend the table, or might contract it | |
8483 | * if two adjacent ranges can be merged. | |
8484 | * We binary-search to find the 'insertion' point, then | |
8485 | * decide how best to handle it. | |
8486 | */ | |
8487 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
8488 | int acknowledged) | |
8489 | { | |
8490 | u64 *p; | |
8491 | int lo, hi; | |
8492 | int rv = 1; | |
905b0297 | 8493 | unsigned long flags; |
2230dfe4 N |
8494 | |
8495 | if (bb->shift < 0) | |
8496 | /* badblocks are disabled */ | |
8497 | return 0; | |
8498 | ||
8499 | if (bb->shift) { | |
8500 | /* round the start down, and the end up */ | |
8501 | sector_t next = s + sectors; | |
8502 | s >>= bb->shift; | |
8503 | next += (1<<bb->shift) - 1; | |
8504 | next >>= bb->shift; | |
8505 | sectors = next - s; | |
8506 | } | |
8507 | ||
905b0297 | 8508 | write_seqlock_irqsave(&bb->lock, flags); |
2230dfe4 N |
8509 | |
8510 | p = bb->page; | |
8511 | lo = 0; | |
8512 | hi = bb->count; | |
8513 | /* Find the last range that starts at-or-before 's' */ | |
8514 | while (hi - lo > 1) { | |
8515 | int mid = (lo + hi) / 2; | |
8516 | sector_t a = BB_OFFSET(p[mid]); | |
8517 | if (a <= s) | |
8518 | lo = mid; | |
8519 | else | |
8520 | hi = mid; | |
8521 | } | |
8522 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8523 | hi = lo; | |
8524 | ||
8525 | if (hi > lo) { | |
8526 | /* we found a range that might merge with the start | |
8527 | * of our new range | |
8528 | */ | |
8529 | sector_t a = BB_OFFSET(p[lo]); | |
8530 | sector_t e = a + BB_LEN(p[lo]); | |
8531 | int ack = BB_ACK(p[lo]); | |
8532 | if (e >= s) { | |
8533 | /* Yes, we can merge with a previous range */ | |
8534 | if (s == a && s + sectors >= e) | |
8535 | /* new range covers old */ | |
8536 | ack = acknowledged; | |
8537 | else | |
8538 | ack = ack && acknowledged; | |
8539 | ||
8540 | if (e < s + sectors) | |
8541 | e = s + sectors; | |
8542 | if (e - a <= BB_MAX_LEN) { | |
8543 | p[lo] = BB_MAKE(a, e-a, ack); | |
8544 | s = e; | |
8545 | } else { | |
8546 | /* does not all fit in one range, | |
8547 | * make p[lo] maximal | |
8548 | */ | |
8549 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8550 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8551 | s = a + BB_MAX_LEN; | |
8552 | } | |
8553 | sectors = e - s; | |
8554 | } | |
8555 | } | |
8556 | if (sectors && hi < bb->count) { | |
8557 | /* 'hi' points to the first range that starts after 's'. | |
8558 | * Maybe we can merge with the start of that range */ | |
8559 | sector_t a = BB_OFFSET(p[hi]); | |
8560 | sector_t e = a + BB_LEN(p[hi]); | |
8561 | int ack = BB_ACK(p[hi]); | |
8562 | if (a <= s + sectors) { | |
8563 | /* merging is possible */ | |
8564 | if (e <= s + sectors) { | |
8565 | /* full overlap */ | |
8566 | e = s + sectors; | |
8567 | ack = acknowledged; | |
8568 | } else | |
8569 | ack = ack && acknowledged; | |
8570 | ||
8571 | a = s; | |
8572 | if (e - a <= BB_MAX_LEN) { | |
8573 | p[hi] = BB_MAKE(a, e-a, ack); | |
8574 | s = e; | |
8575 | } else { | |
8576 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8577 | s = a + BB_MAX_LEN; | |
8578 | } | |
8579 | sectors = e - s; | |
8580 | lo = hi; | |
8581 | hi++; | |
8582 | } | |
8583 | } | |
8584 | if (sectors == 0 && hi < bb->count) { | |
8585 | /* we might be able to combine lo and hi */ | |
8586 | /* Note: 's' is at the end of 'lo' */ | |
8587 | sector_t a = BB_OFFSET(p[hi]); | |
8588 | int lolen = BB_LEN(p[lo]); | |
8589 | int hilen = BB_LEN(p[hi]); | |
8590 | int newlen = lolen + hilen - (s - a); | |
8591 | if (s >= a && newlen < BB_MAX_LEN) { | |
8592 | /* yes, we can combine them */ | |
8593 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8594 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8595 | memmove(p + hi, p + hi + 1, | |
8596 | (bb->count - hi - 1) * 8); | |
8597 | bb->count--; | |
8598 | } | |
8599 | } | |
8600 | while (sectors) { | |
8601 | /* didn't merge (it all). | |
8602 | * Need to add a range just before 'hi' */ | |
8603 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8604 | /* No room for more */ | |
8605 | rv = 0; | |
8606 | break; | |
8607 | } else { | |
8608 | int this_sectors = sectors; | |
8609 | memmove(p + hi + 1, p + hi, | |
8610 | (bb->count - hi) * 8); | |
8611 | bb->count++; | |
8612 | ||
8613 | if (this_sectors > BB_MAX_LEN) | |
8614 | this_sectors = BB_MAX_LEN; | |
8615 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8616 | sectors -= this_sectors; | |
8617 | s += this_sectors; | |
8618 | } | |
8619 | } | |
8620 | ||
8621 | bb->changed = 1; | |
de393cde N |
8622 | if (!acknowledged) |
8623 | bb->unacked_exist = 1; | |
905b0297 | 8624 | write_sequnlock_irqrestore(&bb->lock, flags); |
2230dfe4 N |
8625 | |
8626 | return rv; | |
8627 | } | |
8628 | ||
3cb03002 | 8629 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8630 | int is_new) |
2230dfe4 | 8631 | { |
c6563a8c N |
8632 | int rv; |
8633 | if (is_new) | |
8634 | s += rdev->new_data_offset; | |
8635 | else | |
8636 | s += rdev->data_offset; | |
8637 | rv = md_set_badblocks(&rdev->badblocks, | |
8638 | s, sectors, 0); | |
2230dfe4 N |
8639 | if (rv) { |
8640 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8641 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 | 8642 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
55ce74d4 | 8643 | set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags); |
2230dfe4 N |
8644 | md_wakeup_thread(rdev->mddev->thread); |
8645 | } | |
8646 | return rv; | |
8647 | } | |
8648 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8649 | ||
8650 | /* | |
8651 | * Remove a range of bad blocks from the table. | |
8652 | * This may involve extending the table if we spilt a region, | |
8653 | * but it must not fail. So if the table becomes full, we just | |
8654 | * drop the remove request. | |
8655 | */ | |
8656 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8657 | { | |
8658 | u64 *p; | |
8659 | int lo, hi; | |
8660 | sector_t target = s + sectors; | |
8661 | int rv = 0; | |
8662 | ||
8663 | if (bb->shift > 0) { | |
8664 | /* When clearing we round the start up and the end down. | |
8665 | * This should not matter as the shift should align with | |
8666 | * the block size and no rounding should ever be needed. | |
8667 | * However it is better the think a block is bad when it | |
8668 | * isn't than to think a block is not bad when it is. | |
8669 | */ | |
8670 | s += (1<<bb->shift) - 1; | |
8671 | s >>= bb->shift; | |
8672 | target >>= bb->shift; | |
8673 | sectors = target - s; | |
8674 | } | |
8675 | ||
8676 | write_seqlock_irq(&bb->lock); | |
8677 | ||
8678 | p = bb->page; | |
8679 | lo = 0; | |
8680 | hi = bb->count; | |
8681 | /* Find the last range that starts before 'target' */ | |
8682 | while (hi - lo > 1) { | |
8683 | int mid = (lo + hi) / 2; | |
8684 | sector_t a = BB_OFFSET(p[mid]); | |
8685 | if (a < target) | |
8686 | lo = mid; | |
8687 | else | |
8688 | hi = mid; | |
8689 | } | |
8690 | if (hi > lo) { | |
8691 | /* p[lo] is the last range that could overlap the | |
8692 | * current range. Earlier ranges could also overlap, | |
8693 | * but only this one can overlap the end of the range. | |
8694 | */ | |
8695 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8696 | /* Partial overlap, leave the tail of this range */ | |
8697 | int ack = BB_ACK(p[lo]); | |
8698 | sector_t a = BB_OFFSET(p[lo]); | |
8699 | sector_t end = a + BB_LEN(p[lo]); | |
8700 | ||
8701 | if (a < s) { | |
8702 | /* we need to split this range */ | |
8703 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8b32bf5e | 8704 | rv = -ENOSPC; |
2230dfe4 N |
8705 | goto out; |
8706 | } | |
8707 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8708 | bb->count++; | |
8709 | p[lo] = BB_MAKE(a, s-a, ack); | |
8710 | lo++; | |
8711 | } | |
8712 | p[lo] = BB_MAKE(target, end - target, ack); | |
8713 | /* there is no longer an overlap */ | |
8714 | hi = lo; | |
8715 | lo--; | |
8716 | } | |
8717 | while (lo >= 0 && | |
8718 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8719 | /* This range does overlap */ | |
8720 | if (BB_OFFSET(p[lo]) < s) { | |
8721 | /* Keep the early parts of this range. */ | |
8722 | int ack = BB_ACK(p[lo]); | |
8723 | sector_t start = BB_OFFSET(p[lo]); | |
8724 | p[lo] = BB_MAKE(start, s - start, ack); | |
8725 | /* now low doesn't overlap, so.. */ | |
8726 | break; | |
8727 | } | |
8728 | lo--; | |
8729 | } | |
8730 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8731 | * anything between needs to be discarded | |
8732 | */ | |
8733 | if (hi - lo > 1) { | |
8734 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8735 | bb->count -= (hi - lo - 1); | |
8736 | } | |
8737 | } | |
8738 | ||
8739 | bb->changed = 1; | |
8740 | out: | |
8741 | write_sequnlock_irq(&bb->lock); | |
8742 | return rv; | |
8743 | } | |
8744 | ||
c6563a8c N |
8745 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8746 | int is_new) | |
2230dfe4 | 8747 | { |
c6563a8c N |
8748 | if (is_new) |
8749 | s += rdev->new_data_offset; | |
8750 | else | |
8751 | s += rdev->data_offset; | |
2230dfe4 | 8752 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8753 | s, sectors); |
2230dfe4 N |
8754 | } |
8755 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8756 | ||
8757 | /* | |
8758 | * Acknowledge all bad blocks in a list. | |
8759 | * This only succeeds if ->changed is clear. It is used by | |
8760 | * in-kernel metadata updates | |
8761 | */ | |
8762 | void md_ack_all_badblocks(struct badblocks *bb) | |
8763 | { | |
8764 | if (bb->page == NULL || bb->changed) | |
8765 | /* no point even trying */ | |
8766 | return; | |
8767 | write_seqlock_irq(&bb->lock); | |
8768 | ||
ecb178bb | 8769 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8770 | u64 *p = bb->page; |
8771 | int i; | |
8772 | for (i = 0; i < bb->count ; i++) { | |
8773 | if (!BB_ACK(p[i])) { | |
8774 | sector_t start = BB_OFFSET(p[i]); | |
8775 | int len = BB_LEN(p[i]); | |
8776 | p[i] = BB_MAKE(start, len, 1); | |
8777 | } | |
8778 | } | |
de393cde | 8779 | bb->unacked_exist = 0; |
2230dfe4 N |
8780 | } |
8781 | write_sequnlock_irq(&bb->lock); | |
8782 | } | |
8783 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8784 | ||
16c791a5 N |
8785 | /* sysfs access to bad-blocks list. |
8786 | * We present two files. | |
8787 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8788 | * are recorded as bad. The list is truncated to fit within | |
8789 | * the one-page limit of sysfs. | |
8790 | * Writing "sector length" to this file adds an acknowledged | |
8791 | * bad block list. | |
8792 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8793 | * been acknowledged. Writing to this file adds bad blocks | |
8794 | * without acknowledging them. This is largely for testing. | |
8795 | */ | |
8796 | ||
8797 | static ssize_t | |
8798 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8799 | { | |
8800 | size_t len; | |
8801 | int i; | |
8802 | u64 *p = bb->page; | |
8803 | unsigned seq; | |
8804 | ||
8805 | if (bb->shift < 0) | |
8806 | return 0; | |
8807 | ||
8808 | retry: | |
8809 | seq = read_seqbegin(&bb->lock); | |
8810 | ||
8811 | len = 0; | |
8812 | i = 0; | |
8813 | ||
8814 | while (len < PAGE_SIZE && i < bb->count) { | |
8815 | sector_t s = BB_OFFSET(p[i]); | |
8816 | unsigned int length = BB_LEN(p[i]); | |
8817 | int ack = BB_ACK(p[i]); | |
8818 | i++; | |
8819 | ||
8820 | if (unack && ack) | |
8821 | continue; | |
8822 | ||
8823 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8824 | (unsigned long long)s << bb->shift, | |
8825 | length << bb->shift); | |
8826 | } | |
de393cde N |
8827 | if (unack && len == 0) |
8828 | bb->unacked_exist = 0; | |
16c791a5 N |
8829 | |
8830 | if (read_seqretry(&bb->lock, seq)) | |
8831 | goto retry; | |
8832 | ||
8833 | return len; | |
8834 | } | |
8835 | ||
8836 | #define DO_DEBUG 1 | |
8837 | ||
8838 | static ssize_t | |
8839 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8840 | { | |
8841 | unsigned long long sector; | |
8842 | int length; | |
8843 | char newline; | |
8844 | #ifdef DO_DEBUG | |
8845 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8846 | * Normally only a successful write may clear a badblock | |
8847 | */ | |
8848 | int clear = 0; | |
8849 | if (page[0] == '-') { | |
8850 | clear = 1; | |
8851 | page++; | |
8852 | } | |
8853 | #endif /* DO_DEBUG */ | |
8854 | ||
8855 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8856 | case 3: | |
8857 | if (newline != '\n') | |
8858 | return -EINVAL; | |
8859 | case 2: | |
8860 | if (length <= 0) | |
8861 | return -EINVAL; | |
8862 | break; | |
8863 | default: | |
8864 | return -EINVAL; | |
8865 | } | |
8866 | ||
8867 | #ifdef DO_DEBUG | |
8868 | if (clear) { | |
8869 | md_clear_badblocks(bb, sector, length); | |
8870 | return len; | |
8871 | } | |
8872 | #endif /* DO_DEBUG */ | |
8873 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8874 | return len; | |
8875 | else | |
8876 | return -ENOSPC; | |
8877 | } | |
8878 | ||
75c96f85 AB |
8879 | static int md_notify_reboot(struct notifier_block *this, |
8880 | unsigned long code, void *x) | |
1da177e4 LT |
8881 | { |
8882 | struct list_head *tmp; | |
fd01b88c | 8883 | struct mddev *mddev; |
2dba6a91 | 8884 | int need_delay = 0; |
1da177e4 | 8885 | |
c744a65c N |
8886 | for_each_mddev(mddev, tmp) { |
8887 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8888 | if (mddev->pers) |
8889 | __md_stop_writes(mddev); | |
0f62fb22 N |
8890 | if (mddev->persistent) |
8891 | mddev->safemode = 2; | |
c744a65c | 8892 | mddev_unlock(mddev); |
2dba6a91 | 8893 | } |
c744a65c | 8894 | need_delay = 1; |
1da177e4 | 8895 | } |
c744a65c N |
8896 | /* |
8897 | * certain more exotic SCSI devices are known to be | |
8898 | * volatile wrt too early system reboots. While the | |
8899 | * right place to handle this issue is the given | |
8900 | * driver, we do want to have a safe RAID driver ... | |
8901 | */ | |
8902 | if (need_delay) | |
8903 | mdelay(1000*1); | |
8904 | ||
1da177e4 LT |
8905 | return NOTIFY_DONE; |
8906 | } | |
8907 | ||
75c96f85 | 8908 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8909 | .notifier_call = md_notify_reboot, |
8910 | .next = NULL, | |
8911 | .priority = INT_MAX, /* before any real devices */ | |
8912 | }; | |
8913 | ||
8914 | static void md_geninit(void) | |
8915 | { | |
36a4e1fe | 8916 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8917 | |
c7705f34 | 8918 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8919 | } |
8920 | ||
75c96f85 | 8921 | static int __init md_init(void) |
1da177e4 | 8922 | { |
e804ac78 TH |
8923 | int ret = -ENOMEM; |
8924 | ||
ada609ee | 8925 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8926 | if (!md_wq) |
8927 | goto err_wq; | |
8928 | ||
8929 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8930 | if (!md_misc_wq) | |
8931 | goto err_misc_wq; | |
8932 | ||
8933 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8934 | goto err_md; | |
8935 | ||
8936 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8937 | goto err_mdp; | |
8938 | mdp_major = ret; | |
8939 | ||
af5628f0 | 8940 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
8941 | md_probe, NULL, NULL); |
8942 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8943 | md_probe, NULL, NULL); |
8944 | ||
1da177e4 | 8945 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8946 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8947 | |
8948 | md_geninit(); | |
d710e138 | 8949 | return 0; |
1da177e4 | 8950 | |
e804ac78 TH |
8951 | err_mdp: |
8952 | unregister_blkdev(MD_MAJOR, "md"); | |
8953 | err_md: | |
8954 | destroy_workqueue(md_misc_wq); | |
8955 | err_misc_wq: | |
8956 | destroy_workqueue(md_wq); | |
8957 | err_wq: | |
8958 | return ret; | |
8959 | } | |
1da177e4 | 8960 | |
70bcecdb | 8961 | static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) |
1d7e3e96 | 8962 | { |
70bcecdb GR |
8963 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
8964 | struct md_rdev *rdev2; | |
8965 | int role, ret; | |
8966 | char b[BDEVNAME_SIZE]; | |
1d7e3e96 | 8967 | |
70bcecdb GR |
8968 | /* Check for change of roles in the active devices */ |
8969 | rdev_for_each(rdev2, mddev) { | |
8970 | if (test_bit(Faulty, &rdev2->flags)) | |
8971 | continue; | |
8972 | ||
8973 | /* Check if the roles changed */ | |
8974 | role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); | |
dbb64f86 GR |
8975 | |
8976 | if (test_bit(Candidate, &rdev2->flags)) { | |
8977 | if (role == 0xfffe) { | |
8978 | pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); | |
8979 | md_kick_rdev_from_array(rdev2); | |
8980 | continue; | |
8981 | } | |
8982 | else | |
8983 | clear_bit(Candidate, &rdev2->flags); | |
8984 | } | |
8985 | ||
70bcecdb GR |
8986 | if (role != rdev2->raid_disk) { |
8987 | /* got activated */ | |
8988 | if (rdev2->raid_disk == -1 && role != 0xffff) { | |
8989 | rdev2->saved_raid_disk = role; | |
8990 | ret = remove_and_add_spares(mddev, rdev2); | |
8991 | pr_info("Activated spare: %s\n", | |
8992 | bdevname(rdev2->bdev,b)); | |
8993 | continue; | |
8994 | } | |
8995 | /* device faulty | |
8996 | * We just want to do the minimum to mark the disk | |
8997 | * as faulty. The recovery is performed by the | |
8998 | * one who initiated the error. | |
8999 | */ | |
9000 | if ((role == 0xfffe) || (role == 0xfffd)) { | |
9001 | md_error(mddev, rdev2); | |
9002 | clear_bit(Blocked, &rdev2->flags); | |
9003 | } | |
9004 | } | |
1d7e3e96 | 9005 | } |
70bcecdb GR |
9006 | |
9007 | /* recovery_cp changed */ | |
9008 | if (le64_to_cpu(sb->resync_offset) != mddev->recovery_cp) | |
9009 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
9010 | ||
9011 | /* Finally set the event to be up to date */ | |
9012 | mddev->events = le64_to_cpu(sb->events); | |
9013 | } | |
9014 | ||
9015 | static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) | |
9016 | { | |
9017 | int err; | |
9018 | struct page *swapout = rdev->sb_page; | |
9019 | struct mdp_superblock_1 *sb; | |
9020 | ||
9021 | /* Store the sb page of the rdev in the swapout temporary | |
9022 | * variable in case we err in the future | |
9023 | */ | |
9024 | rdev->sb_page = NULL; | |
9025 | alloc_disk_sb(rdev); | |
9026 | ClearPageUptodate(rdev->sb_page); | |
9027 | rdev->sb_loaded = 0; | |
9028 | err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version); | |
9029 | ||
9030 | if (err < 0) { | |
9031 | pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", | |
9032 | __func__, __LINE__, rdev->desc_nr, err); | |
9033 | put_page(rdev->sb_page); | |
9034 | rdev->sb_page = swapout; | |
9035 | rdev->sb_loaded = 1; | |
9036 | return err; | |
1d7e3e96 GR |
9037 | } |
9038 | ||
70bcecdb GR |
9039 | sb = page_address(rdev->sb_page); |
9040 | /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET | |
9041 | * is not set | |
9042 | */ | |
9043 | ||
9044 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) | |
9045 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
9046 | ||
9047 | /* The other node finished recovery, call spare_active to set | |
9048 | * device In_sync and mddev->degraded | |
9049 | */ | |
9050 | if (rdev->recovery_offset == MaxSector && | |
9051 | !test_bit(In_sync, &rdev->flags) && | |
9052 | mddev->pers->spare_active(mddev)) | |
9053 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
9054 | ||
9055 | put_page(swapout); | |
9056 | return 0; | |
9057 | } | |
9058 | ||
9059 | void md_reload_sb(struct mddev *mddev, int nr) | |
9060 | { | |
9061 | struct md_rdev *rdev; | |
9062 | int err; | |
9063 | ||
9064 | /* Find the rdev */ | |
9065 | rdev_for_each_rcu(rdev, mddev) { | |
9066 | if (rdev->desc_nr == nr) | |
9067 | break; | |
9068 | } | |
9069 | ||
9070 | if (!rdev || rdev->desc_nr != nr) { | |
9071 | pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); | |
9072 | return; | |
9073 | } | |
9074 | ||
9075 | err = read_rdev(mddev, rdev); | |
9076 | if (err < 0) | |
9077 | return; | |
9078 | ||
9079 | check_sb_changes(mddev, rdev); | |
9080 | ||
9081 | /* Read all rdev's to update recovery_offset */ | |
9082 | rdev_for_each_rcu(rdev, mddev) | |
9083 | read_rdev(mddev, rdev); | |
1d7e3e96 GR |
9084 | } |
9085 | EXPORT_SYMBOL(md_reload_sb); | |
9086 | ||
1da177e4 LT |
9087 | #ifndef MODULE |
9088 | ||
9089 | /* | |
9090 | * Searches all registered partitions for autorun RAID arrays | |
9091 | * at boot time. | |
9092 | */ | |
4d936ec1 ME |
9093 | |
9094 | static LIST_HEAD(all_detected_devices); | |
9095 | struct detected_devices_node { | |
9096 | struct list_head list; | |
9097 | dev_t dev; | |
9098 | }; | |
1da177e4 LT |
9099 | |
9100 | void md_autodetect_dev(dev_t dev) | |
9101 | { | |
4d936ec1 ME |
9102 | struct detected_devices_node *node_detected_dev; |
9103 | ||
9104 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
9105 | if (node_detected_dev) { | |
9106 | node_detected_dev->dev = dev; | |
9107 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
9108 | } else { | |
9109 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
9110 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
9111 | } | |
1da177e4 LT |
9112 | } |
9113 | ||
1da177e4 LT |
9114 | static void autostart_arrays(int part) |
9115 | { | |
3cb03002 | 9116 | struct md_rdev *rdev; |
4d936ec1 ME |
9117 | struct detected_devices_node *node_detected_dev; |
9118 | dev_t dev; | |
9119 | int i_scanned, i_passed; | |
1da177e4 | 9120 | |
4d936ec1 ME |
9121 | i_scanned = 0; |
9122 | i_passed = 0; | |
1da177e4 | 9123 | |
4d936ec1 | 9124 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 9125 | |
4d936ec1 ME |
9126 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
9127 | i_scanned++; | |
9128 | node_detected_dev = list_entry(all_detected_devices.next, | |
9129 | struct detected_devices_node, list); | |
9130 | list_del(&node_detected_dev->list); | |
9131 | dev = node_detected_dev->dev; | |
9132 | kfree(node_detected_dev); | |
df968c4e | 9133 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
9134 | if (IS_ERR(rdev)) |
9135 | continue; | |
9136 | ||
403df478 | 9137 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 9138 | continue; |
403df478 | 9139 | |
d0fae18f | 9140 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 9141 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 9142 | i_passed++; |
1da177e4 | 9143 | } |
4d936ec1 ME |
9144 | |
9145 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
9146 | i_scanned, i_passed); | |
1da177e4 LT |
9147 | |
9148 | autorun_devices(part); | |
9149 | } | |
9150 | ||
fdee8ae4 | 9151 | #endif /* !MODULE */ |
1da177e4 LT |
9152 | |
9153 | static __exit void md_exit(void) | |
9154 | { | |
fd01b88c | 9155 | struct mddev *mddev; |
1da177e4 | 9156 | struct list_head *tmp; |
e2f23b60 | 9157 | int delay = 1; |
8ab5e4c1 | 9158 | |
af5628f0 | 9159 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 9160 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 9161 | |
3dbd8c2e | 9162 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
9163 | unregister_blkdev(mdp_major, "mdp"); |
9164 | unregister_reboot_notifier(&md_notifier); | |
9165 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
9166 | |
9167 | /* We cannot unload the modules while some process is | |
9168 | * waiting for us in select() or poll() - wake them up | |
9169 | */ | |
9170 | md_unloading = 1; | |
9171 | while (waitqueue_active(&md_event_waiters)) { | |
9172 | /* not safe to leave yet */ | |
9173 | wake_up(&md_event_waiters); | |
9174 | msleep(delay); | |
9175 | delay += delay; | |
9176 | } | |
1da177e4 | 9177 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 9178 | |
29ac4aa3 | 9179 | for_each_mddev(mddev, tmp) { |
1da177e4 | 9180 | export_array(mddev); |
d3374825 | 9181 | mddev->hold_active = 0; |
1da177e4 | 9182 | } |
e804ac78 TH |
9183 | destroy_workqueue(md_misc_wq); |
9184 | destroy_workqueue(md_wq); | |
1da177e4 LT |
9185 | } |
9186 | ||
685784aa | 9187 | subsys_initcall(md_init); |
1da177e4 LT |
9188 | module_exit(md_exit) |
9189 | ||
f91de92e N |
9190 | static int get_ro(char *buffer, struct kernel_param *kp) |
9191 | { | |
9192 | return sprintf(buffer, "%d", start_readonly); | |
9193 | } | |
9194 | static int set_ro(const char *val, struct kernel_param *kp) | |
9195 | { | |
4c9309c0 | 9196 | return kstrtouint(val, 10, (unsigned int *)&start_readonly); |
f91de92e N |
9197 | } |
9198 | ||
80ca3a44 N |
9199 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
9200 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 9201 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 9202 | |
1da177e4 | 9203 | MODULE_LICENSE("GPL"); |
0efb9e61 | 9204 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 9205 | MODULE_ALIAS("md"); |
72008652 | 9206 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |