Commit | Line | Data |
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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)) || | |
2aa82191 GR |
2233 | (mddev->layout != le64_to_cpu(sb->layout)) || |
2234 | (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || | |
2235 | (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) | |
2236 | return true; | |
2237 | ||
2238 | return false; | |
2239 | } | |
2240 | ||
1aee41f6 | 2241 | void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2242 | { |
3cb03002 | 2243 | struct md_rdev *rdev; |
06d91a5f | 2244 | int sync_req; |
42543769 | 2245 | int nospares = 0; |
2699b672 | 2246 | int any_badblocks_changed = 0; |
23b63f9f | 2247 | int ret = -1; |
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; | |
23b63f9f | 2258 | ret = md_cluster_ops->metadata_update_start(mddev); |
2aa82191 GR |
2259 | /* Has someone else has updated the sb */ |
2260 | if (!does_sb_need_changing(mddev)) { | |
23b63f9f GJ |
2261 | if (ret == 0) |
2262 | md_cluster_ops->metadata_update_cancel(mddev); | |
2aa82191 GR |
2263 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
2264 | return; | |
2265 | } | |
2266 | } | |
1da177e4 | 2267 | repeat: |
3a3a5ddb | 2268 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2269 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2270 | if (rdev->raid_disk >= 0 && |
2271 | mddev->delta_disks >= 0 && | |
2272 | !test_bit(In_sync, &rdev->flags) && | |
2273 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2274 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2275 | ||
f72ffdd6 | 2276 | } |
bd52b746 | 2277 | if (!mddev->persistent) { |
070dc6dd | 2278 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2279 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2280 | if (!mddev->external) { |
d97a41dc | 2281 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2282 | rdev_for_each(rdev, mddev) { |
de393cde | 2283 | if (rdev->badblocks.changed) { |
d0962936 | 2284 | rdev->badblocks.changed = 0; |
de393cde N |
2285 | md_ack_all_badblocks(&rdev->badblocks); |
2286 | md_error(mddev, rdev); | |
2287 | } | |
2288 | clear_bit(Blocked, &rdev->flags); | |
2289 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2290 | wake_up(&rdev->blocked_wait); | |
2291 | } | |
2292 | } | |
3a3a5ddb N |
2293 | wake_up(&mddev->sb_wait); |
2294 | return; | |
2295 | } | |
2296 | ||
85572d7c | 2297 | spin_lock(&mddev->lock); |
84692195 | 2298 | |
3a3a5ddb N |
2299 | mddev->utime = get_seconds(); |
2300 | ||
850b2b42 N |
2301 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2302 | force_change = 1; | |
2303 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2304 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2305 | * though if events isn't the right even/odd, we will have to do | |
2306 | * spares after all | |
2307 | */ | |
2308 | nospares = 1; | |
2309 | if (force_change) | |
2310 | nospares = 0; | |
2311 | if (mddev->degraded) | |
84692195 N |
2312 | /* If the array is degraded, then skipping spares is both |
2313 | * dangerous and fairly pointless. | |
2314 | * Dangerous because a device that was removed from the array | |
2315 | * might have a event_count that still looks up-to-date, | |
2316 | * so it can be re-added without a resync. | |
2317 | * Pointless because if there are any spares to skip, | |
2318 | * then a recovery will happen and soon that array won't | |
2319 | * be degraded any more and the spare can go back to sleep then. | |
2320 | */ | |
850b2b42 | 2321 | nospares = 0; |
84692195 | 2322 | |
06d91a5f | 2323 | sync_req = mddev->in_sync; |
42543769 N |
2324 | |
2325 | /* If this is just a dirty<->clean transition, and the array is clean | |
2326 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2327 | if (nospares |
42543769 | 2328 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2329 | && mddev->can_decrease_events |
2330 | && mddev->events != 1) { | |
42543769 | 2331 | mddev->events--; |
a8707c08 N |
2332 | mddev->can_decrease_events = 0; |
2333 | } else { | |
42543769 N |
2334 | /* otherwise we have to go forward and ... */ |
2335 | mddev->events ++; | |
a8707c08 | 2336 | mddev->can_decrease_events = nospares; |
42543769 | 2337 | } |
1da177e4 | 2338 | |
403df478 N |
2339 | /* |
2340 | * This 64-bit counter should never wrap. | |
2341 | * Either we are in around ~1 trillion A.C., assuming | |
2342 | * 1 reboot per second, or we have a bug... | |
2343 | */ | |
2344 | WARN_ON(mddev->events == 0); | |
2699b672 | 2345 | |
dafb20fa | 2346 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2347 | if (rdev->badblocks.changed) |
2348 | any_badblocks_changed++; | |
de393cde N |
2349 | if (test_bit(Faulty, &rdev->flags)) |
2350 | set_bit(FaultRecorded, &rdev->flags); | |
2351 | } | |
2699b672 | 2352 | |
e691063a | 2353 | sync_sbs(mddev, nospares); |
85572d7c | 2354 | spin_unlock(&mddev->lock); |
1da177e4 | 2355 | |
36a4e1fe N |
2356 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2357 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2358 | |
4ad13663 | 2359 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2360 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2361 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2362 | |
42543769 N |
2363 | if (rdev->sb_loaded != 1) |
2364 | continue; /* no noise on spare devices */ | |
1da177e4 | 2365 | |
f466722c | 2366 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2367 | md_super_write(mddev,rdev, |
0f420358 | 2368 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2369 | rdev->sb_page); |
36a4e1fe N |
2370 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2371 | bdevname(rdev->bdev, b), | |
2372 | (unsigned long long)rdev->sb_start); | |
42543769 | 2373 | rdev->sb_events = mddev->events; |
2699b672 N |
2374 | if (rdev->badblocks.size) { |
2375 | md_super_write(mddev, rdev, | |
2376 | rdev->badblocks.sector, | |
2377 | rdev->badblocks.size << 9, | |
2378 | rdev->bb_page); | |
2379 | rdev->badblocks.size = 0; | |
2380 | } | |
7bfa19f2 | 2381 | |
f466722c | 2382 | } else |
36a4e1fe N |
2383 | pr_debug("md: %s (skipping faulty)\n", |
2384 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2385 | |
7bfa19f2 | 2386 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2387 | /* only need to write one superblock... */ |
2388 | break; | |
2389 | } | |
a9701a30 | 2390 | md_super_wait(mddev); |
850b2b42 | 2391 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2392 | |
85572d7c | 2393 | spin_lock(&mddev->lock); |
850b2b42 N |
2394 | if (mddev->in_sync != sync_req || |
2395 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2396 | /* have to write it out again */ |
85572d7c | 2397 | spin_unlock(&mddev->lock); |
06d91a5f N |
2398 | goto repeat; |
2399 | } | |
850b2b42 | 2400 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
85572d7c | 2401 | spin_unlock(&mddev->lock); |
3d310eb7 | 2402 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2403 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2404 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2405 | |
dafb20fa | 2406 | rdev_for_each(rdev, mddev) { |
de393cde N |
2407 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2408 | clear_bit(Blocked, &rdev->flags); | |
2409 | ||
2410 | if (any_badblocks_changed) | |
2699b672 | 2411 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2412 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2413 | wake_up(&rdev->blocked_wait); | |
2414 | } | |
2aa82191 | 2415 | |
23b63f9f | 2416 | if (mddev_is_clustered(mddev) && ret == 0) |
2aa82191 | 2417 | md_cluster_ops->metadata_update_finish(mddev); |
1da177e4 | 2418 | } |
1aee41f6 | 2419 | EXPORT_SYMBOL(md_update_sb); |
1da177e4 | 2420 | |
a6da4ef8 GR |
2421 | static int add_bound_rdev(struct md_rdev *rdev) |
2422 | { | |
2423 | struct mddev *mddev = rdev->mddev; | |
2424 | int err = 0; | |
2425 | ||
2426 | if (!mddev->pers->hot_remove_disk) { | |
2427 | /* If there is hot_add_disk but no hot_remove_disk | |
2428 | * then added disks for geometry changes, | |
2429 | * and should be added immediately. | |
2430 | */ | |
2431 | super_types[mddev->major_version]. | |
2432 | validate_super(mddev, rdev); | |
2433 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
2434 | if (err) { | |
2435 | unbind_rdev_from_array(rdev); | |
2436 | export_rdev(rdev); | |
2437 | return err; | |
2438 | } | |
2439 | } | |
2440 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
2441 | ||
2442 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2443 | if (mddev->degraded) | |
2444 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
2445 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2446 | md_new_event(mddev); | |
2447 | md_wakeup_thread(mddev->thread); | |
2448 | return 0; | |
2449 | } | |
1da177e4 | 2450 | |
7f6ce769 | 2451 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2452 | * We want to accept with case. For this we use cmd_match. |
2453 | */ | |
2454 | static int cmd_match(const char *cmd, const char *str) | |
2455 | { | |
2456 | /* See if cmd, written into a sysfs file, matches | |
2457 | * str. They must either be the same, or cmd can | |
2458 | * have a trailing newline | |
2459 | */ | |
2460 | while (*cmd && *str && *cmd == *str) { | |
2461 | cmd++; | |
2462 | str++; | |
2463 | } | |
2464 | if (*cmd == '\n') | |
2465 | cmd++; | |
2466 | if (*str || *cmd) | |
2467 | return 0; | |
2468 | return 1; | |
2469 | } | |
2470 | ||
86e6ffdd N |
2471 | struct rdev_sysfs_entry { |
2472 | struct attribute attr; | |
3cb03002 N |
2473 | ssize_t (*show)(struct md_rdev *, char *); |
2474 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2475 | }; |
2476 | ||
2477 | static ssize_t | |
3cb03002 | 2478 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2479 | { |
2480 | char *sep = ""; | |
20a49ff6 | 2481 | size_t len = 0; |
758bfc8a | 2482 | unsigned long flags = ACCESS_ONCE(rdev->flags); |
86e6ffdd | 2483 | |
758bfc8a | 2484 | if (test_bit(Faulty, &flags) || |
de393cde | 2485 | rdev->badblocks.unacked_exist) { |
86e6ffdd N |
2486 | len+= sprintf(page+len, "%sfaulty",sep); |
2487 | sep = ","; | |
2488 | } | |
758bfc8a | 2489 | if (test_bit(In_sync, &flags)) { |
86e6ffdd N |
2490 | len += sprintf(page+len, "%sin_sync",sep); |
2491 | sep = ","; | |
2492 | } | |
758bfc8a | 2493 | if (test_bit(WriteMostly, &flags)) { |
f655675b N |
2494 | len += sprintf(page+len, "%swrite_mostly",sep); |
2495 | sep = ","; | |
2496 | } | |
758bfc8a | 2497 | if (test_bit(Blocked, &flags) || |
52c64152 | 2498 | (rdev->badblocks.unacked_exist |
758bfc8a | 2499 | && !test_bit(Faulty, &flags))) { |
6bfe0b49 DW |
2500 | len += sprintf(page+len, "%sblocked", sep); |
2501 | sep = ","; | |
2502 | } | |
758bfc8a N |
2503 | if (!test_bit(Faulty, &flags) && |
2504 | !test_bit(In_sync, &flags)) { | |
86e6ffdd N |
2505 | len += sprintf(page+len, "%sspare", sep); |
2506 | sep = ","; | |
2507 | } | |
758bfc8a | 2508 | if (test_bit(WriteErrorSeen, &flags)) { |
d7a9d443 N |
2509 | len += sprintf(page+len, "%swrite_error", sep); |
2510 | sep = ","; | |
2511 | } | |
758bfc8a | 2512 | if (test_bit(WantReplacement, &flags)) { |
2d78f8c4 N |
2513 | len += sprintf(page+len, "%swant_replacement", sep); |
2514 | sep = ","; | |
2515 | } | |
758bfc8a | 2516 | if (test_bit(Replacement, &flags)) { |
2d78f8c4 N |
2517 | len += sprintf(page+len, "%sreplacement", sep); |
2518 | sep = ","; | |
2519 | } | |
2520 | ||
86e6ffdd N |
2521 | return len+sprintf(page+len, "\n"); |
2522 | } | |
2523 | ||
45dc2de1 | 2524 | static ssize_t |
3cb03002 | 2525 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2526 | { |
2527 | /* can write | |
de393cde | 2528 | * faulty - simulates an error |
45dc2de1 | 2529 | * remove - disconnects the device |
f655675b N |
2530 | * writemostly - sets write_mostly |
2531 | * -writemostly - clears write_mostly | |
de393cde N |
2532 | * blocked - sets the Blocked flags |
2533 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2534 | * insync - sets Insync providing device isn't active |
f466722c N |
2535 | * -insync - clear Insync for a device with a slot assigned, |
2536 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2537 | * write_error - sets WriteErrorSeen |
2538 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2539 | */ |
2540 | int err = -EINVAL; | |
2541 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2542 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2543 | if (test_bit(Faulty, &rdev->flags)) |
2544 | err = 0; | |
2545 | else | |
2546 | err = -EBUSY; | |
45dc2de1 N |
2547 | } else if (cmd_match(buf, "remove")) { |
2548 | if (rdev->raid_disk >= 0) | |
2549 | err = -EBUSY; | |
2550 | else { | |
fd01b88c | 2551 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2552 | err = 0; |
a9720903 GJ |
2553 | if (mddev_is_clustered(mddev)) |
2554 | err = md_cluster_ops->remove_disk(mddev, rdev); | |
2555 | ||
2556 | if (err == 0) { | |
2557 | md_kick_rdev_from_array(rdev); | |
2558 | if (mddev->pers) | |
2559 | md_update_sb(mddev, 1); | |
2560 | md_new_event(mddev); | |
2561 | } | |
45dc2de1 | 2562 | } |
f655675b N |
2563 | } else if (cmd_match(buf, "writemostly")) { |
2564 | set_bit(WriteMostly, &rdev->flags); | |
2565 | err = 0; | |
2566 | } else if (cmd_match(buf, "-writemostly")) { | |
2567 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2568 | err = 0; |
2569 | } else if (cmd_match(buf, "blocked")) { | |
2570 | set_bit(Blocked, &rdev->flags); | |
2571 | err = 0; | |
2572 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2573 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2574 | rdev->badblocks.unacked_exist) { |
de393cde N |
2575 | /* metadata handler doesn't understand badblocks, |
2576 | * so we need to fail the device | |
2577 | */ | |
2578 | md_error(rdev->mddev, rdev); | |
2579 | } | |
6bfe0b49 | 2580 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2581 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2582 | wake_up(&rdev->blocked_wait); |
2583 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2584 | md_wakeup_thread(rdev->mddev->thread); | |
2585 | ||
6d56e278 N |
2586 | err = 0; |
2587 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2588 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2589 | err = 0; |
f466722c | 2590 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0) { |
e1960f8c N |
2591 | if (rdev->mddev->pers == NULL) { |
2592 | clear_bit(In_sync, &rdev->flags); | |
2593 | rdev->saved_raid_disk = rdev->raid_disk; | |
2594 | rdev->raid_disk = -1; | |
2595 | err = 0; | |
2596 | } | |
d7a9d443 N |
2597 | } else if (cmd_match(buf, "write_error")) { |
2598 | set_bit(WriteErrorSeen, &rdev->flags); | |
2599 | err = 0; | |
2600 | } else if (cmd_match(buf, "-write_error")) { | |
2601 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2602 | err = 0; | |
2d78f8c4 N |
2603 | } else if (cmd_match(buf, "want_replacement")) { |
2604 | /* Any non-spare device that is not a replacement can | |
2605 | * become want_replacement at any time, but we then need to | |
2606 | * check if recovery is needed. | |
2607 | */ | |
2608 | if (rdev->raid_disk >= 0 && | |
2609 | !test_bit(Replacement, &rdev->flags)) | |
2610 | set_bit(WantReplacement, &rdev->flags); | |
2611 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2612 | md_wakeup_thread(rdev->mddev->thread); | |
2613 | err = 0; | |
2614 | } else if (cmd_match(buf, "-want_replacement")) { | |
2615 | /* Clearing 'want_replacement' is always allowed. | |
2616 | * Once replacements starts it is too late though. | |
2617 | */ | |
2618 | err = 0; | |
2619 | clear_bit(WantReplacement, &rdev->flags); | |
2620 | } else if (cmd_match(buf, "replacement")) { | |
2621 | /* Can only set a device as a replacement when array has not | |
2622 | * yet been started. Once running, replacement is automatic | |
2623 | * from spares, or by assigning 'slot'. | |
2624 | */ | |
2625 | if (rdev->mddev->pers) | |
2626 | err = -EBUSY; | |
2627 | else { | |
2628 | set_bit(Replacement, &rdev->flags); | |
2629 | err = 0; | |
2630 | } | |
2631 | } else if (cmd_match(buf, "-replacement")) { | |
2632 | /* Similarly, can only clear Replacement before start */ | |
2633 | if (rdev->mddev->pers) | |
2634 | err = -EBUSY; | |
2635 | else { | |
2636 | clear_bit(Replacement, &rdev->flags); | |
2637 | err = 0; | |
2638 | } | |
a6da4ef8 GR |
2639 | } else if (cmd_match(buf, "re-add")) { |
2640 | if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) { | |
97f6cd39 GR |
2641 | /* clear_bit is performed _after_ all the devices |
2642 | * have their local Faulty bit cleared. If any writes | |
2643 | * happen in the meantime in the local node, they | |
2644 | * will land in the local bitmap, which will be synced | |
2645 | * by this node eventually | |
2646 | */ | |
2647 | if (!mddev_is_clustered(rdev->mddev) || | |
2648 | (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { | |
2649 | clear_bit(Faulty, &rdev->flags); | |
2650 | err = add_bound_rdev(rdev); | |
2651 | } | |
a6da4ef8 GR |
2652 | } else |
2653 | err = -EBUSY; | |
45dc2de1 | 2654 | } |
00bcb4ac N |
2655 | if (!err) |
2656 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2657 | return err ? err : len; |
2658 | } | |
80ca3a44 | 2659 | static struct rdev_sysfs_entry rdev_state = |
750f199e | 2660 | __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); |
86e6ffdd | 2661 | |
4dbcdc75 | 2662 | static ssize_t |
3cb03002 | 2663 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2664 | { |
2665 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2666 | } | |
2667 | ||
2668 | static ssize_t | |
3cb03002 | 2669 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 | 2670 | { |
4c9309c0 AD |
2671 | unsigned int n; |
2672 | int rv; | |
2673 | ||
2674 | rv = kstrtouint(buf, 10, &n); | |
2675 | if (rv < 0) | |
2676 | return rv; | |
2677 | atomic_set(&rdev->corrected_errors, n); | |
2678 | return len; | |
4dbcdc75 N |
2679 | } |
2680 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2681 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2682 | |
014236d2 | 2683 | static ssize_t |
3cb03002 | 2684 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2685 | { |
2686 | if (rdev->raid_disk < 0) | |
2687 | return sprintf(page, "none\n"); | |
2688 | else | |
2689 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2690 | } | |
2691 | ||
2692 | static ssize_t | |
3cb03002 | 2693 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 | 2694 | { |
4c9309c0 | 2695 | int slot; |
c303da6d | 2696 | int err; |
4c9309c0 | 2697 | |
014236d2 N |
2698 | if (strncmp(buf, "none", 4)==0) |
2699 | slot = -1; | |
4c9309c0 AD |
2700 | else { |
2701 | err = kstrtouint(buf, 10, (unsigned int *)&slot); | |
2702 | if (err < 0) | |
2703 | return err; | |
2704 | } | |
6c2fce2e | 2705 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2706 | /* Setting 'slot' on an active array requires also |
2707 | * updating the 'rd%d' link, and communicating | |
2708 | * with the personality with ->hot_*_disk. | |
2709 | * For now we only support removing | |
2710 | * failed/spare devices. This normally happens automatically, | |
2711 | * but not when the metadata is externally managed. | |
2712 | */ | |
c303da6d N |
2713 | if (rdev->raid_disk == -1) |
2714 | return -EEXIST; | |
2715 | /* personality does all needed checks */ | |
01393f3d | 2716 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2717 | return -EINVAL; |
746d3207 N |
2718 | clear_bit(Blocked, &rdev->flags); |
2719 | remove_and_add_spares(rdev->mddev, rdev); | |
2720 | if (rdev->raid_disk >= 0) | |
2721 | return -EBUSY; | |
c303da6d N |
2722 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2723 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2724 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2725 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2726 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2727 | */ |
2728 | ||
2729 | if (rdev->raid_disk != -1) | |
2730 | return -EBUSY; | |
2731 | ||
c6751b2b N |
2732 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2733 | return -EBUSY; | |
2734 | ||
6c2fce2e NB |
2735 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2736 | return -EINVAL; | |
2737 | ||
ba1b41b6 N |
2738 | if (slot >= rdev->mddev->raid_disks && |
2739 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2740 | return -ENOSPC; | |
2741 | ||
6c2fce2e NB |
2742 | rdev->raid_disk = slot; |
2743 | if (test_bit(In_sync, &rdev->flags)) | |
2744 | rdev->saved_raid_disk = slot; | |
2745 | else | |
2746 | rdev->saved_raid_disk = -1; | |
d30519fc | 2747 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2748 | clear_bit(Bitmap_sync, &rdev->flags); |
2910ff17 GR |
2749 | remove_and_add_spares(rdev->mddev, rdev); |
2750 | if (rdev->raid_disk == -1) | |
2751 | return -EBUSY; | |
6c2fce2e | 2752 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2753 | } else { |
ba1b41b6 N |
2754 | if (slot >= rdev->mddev->raid_disks && |
2755 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2756 | return -ENOSPC; |
2757 | rdev->raid_disk = slot; | |
2758 | /* assume it is working */ | |
c5d79adb N |
2759 | clear_bit(Faulty, &rdev->flags); |
2760 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2761 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2762 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2763 | } |
014236d2 N |
2764 | return len; |
2765 | } | |
2766 | ||
014236d2 | 2767 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2768 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2769 | |
93c8cad0 | 2770 | static ssize_t |
3cb03002 | 2771 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2772 | { |
6961ece4 | 2773 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2774 | } |
2775 | ||
2776 | static ssize_t | |
3cb03002 | 2777 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2778 | { |
c6563a8c | 2779 | unsigned long long offset; |
b29bebd6 | 2780 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 2781 | return -EINVAL; |
8ed0a521 | 2782 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2783 | return -EBUSY; |
dd8ac336 | 2784 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2785 | /* Must set offset before size, so overlap checks |
2786 | * can be sane */ | |
2787 | return -EBUSY; | |
93c8cad0 | 2788 | rdev->data_offset = offset; |
25f7fd47 | 2789 | rdev->new_data_offset = offset; |
93c8cad0 N |
2790 | return len; |
2791 | } | |
2792 | ||
2793 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2794 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2795 | |
c6563a8c N |
2796 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2797 | { | |
2798 | return sprintf(page, "%llu\n", | |
2799 | (unsigned long long)rdev->new_data_offset); | |
2800 | } | |
2801 | ||
2802 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2803 | const char *buf, size_t len) | |
2804 | { | |
2805 | unsigned long long new_offset; | |
2806 | struct mddev *mddev = rdev->mddev; | |
2807 | ||
b29bebd6 | 2808 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
2809 | return -EINVAL; |
2810 | ||
f851b60d N |
2811 | if (mddev->sync_thread || |
2812 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
2813 | return -EBUSY; |
2814 | if (new_offset == rdev->data_offset) | |
2815 | /* reset is always permitted */ | |
2816 | ; | |
2817 | else if (new_offset > rdev->data_offset) { | |
2818 | /* must not push array size beyond rdev_sectors */ | |
2819 | if (new_offset - rdev->data_offset | |
2820 | + mddev->dev_sectors > rdev->sectors) | |
2821 | return -E2BIG; | |
2822 | } | |
2823 | /* Metadata worries about other space details. */ | |
2824 | ||
2825 | /* decreasing the offset is inconsistent with a backwards | |
2826 | * reshape. | |
2827 | */ | |
2828 | if (new_offset < rdev->data_offset && | |
2829 | mddev->reshape_backwards) | |
2830 | return -EINVAL; | |
2831 | /* Increasing offset is inconsistent with forwards | |
2832 | * reshape. reshape_direction should be set to | |
2833 | * 'backwards' first. | |
2834 | */ | |
2835 | if (new_offset > rdev->data_offset && | |
2836 | !mddev->reshape_backwards) | |
2837 | return -EINVAL; | |
2838 | ||
2839 | if (mddev->pers && mddev->persistent && | |
2840 | !super_types[mddev->major_version] | |
2841 | .allow_new_offset(rdev, new_offset)) | |
2842 | return -E2BIG; | |
2843 | rdev->new_data_offset = new_offset; | |
2844 | if (new_offset > rdev->data_offset) | |
2845 | mddev->reshape_backwards = 1; | |
2846 | else if (new_offset < rdev->data_offset) | |
2847 | mddev->reshape_backwards = 0; | |
2848 | ||
2849 | return len; | |
2850 | } | |
2851 | static struct rdev_sysfs_entry rdev_new_offset = | |
2852 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2853 | ||
83303b61 | 2854 | static ssize_t |
3cb03002 | 2855 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2856 | { |
dd8ac336 | 2857 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2858 | } |
2859 | ||
c5d79adb N |
2860 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2861 | { | |
2862 | /* check if two start/length pairs overlap */ | |
2863 | if (s1+l1 <= s2) | |
2864 | return 0; | |
2865 | if (s2+l2 <= s1) | |
2866 | return 0; | |
2867 | return 1; | |
2868 | } | |
2869 | ||
b522adcd DW |
2870 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2871 | { | |
2872 | unsigned long long blocks; | |
2873 | sector_t new; | |
2874 | ||
b29bebd6 | 2875 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
2876 | return -EINVAL; |
2877 | ||
2878 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2879 | return -EINVAL; /* sector conversion overflow */ | |
2880 | ||
2881 | new = blocks * 2; | |
2882 | if (new != blocks * 2) | |
2883 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2884 | ||
2885 | *sectors = new; | |
2886 | return 0; | |
2887 | } | |
2888 | ||
83303b61 | 2889 | static ssize_t |
3cb03002 | 2890 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2891 | { |
fd01b88c | 2892 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2893 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2894 | sector_t sectors; |
27c529bb | 2895 | |
b522adcd | 2896 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2897 | return -EINVAL; |
c6563a8c N |
2898 | if (rdev->data_offset != rdev->new_data_offset) |
2899 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2900 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2901 | if (my_mddev->persistent) { |
dd8ac336 AN |
2902 | sectors = super_types[my_mddev->major_version]. |
2903 | rdev_size_change(rdev, sectors); | |
2904 | if (!sectors) | |
0cd17fec | 2905 | return -EBUSY; |
dd8ac336 | 2906 | } else if (!sectors) |
77304d2a | 2907 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2908 | rdev->data_offset; |
a6468539 N |
2909 | if (!my_mddev->pers->resize) |
2910 | /* Cannot change size for RAID0 or Linear etc */ | |
2911 | return -EINVAL; | |
0cd17fec | 2912 | } |
dd8ac336 | 2913 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2914 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2915 | |
dd8ac336 AN |
2916 | rdev->sectors = sectors; |
2917 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
2918 | /* Need to check that all other rdevs with the same |
2919 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
2920 | * the rdev lists safely. | |
2921 | * This check does not provide a hard guarantee, it | |
2922 | * just helps avoid dangerous mistakes. | |
c5d79adb | 2923 | */ |
fd01b88c | 2924 | struct mddev *mddev; |
c5d79adb | 2925 | int overlap = 0; |
159ec1fc | 2926 | struct list_head *tmp; |
c5d79adb | 2927 | |
8b1afc3d | 2928 | rcu_read_lock(); |
29ac4aa3 | 2929 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2930 | struct md_rdev *rdev2; |
c5d79adb | 2931 | |
dafb20fa | 2932 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
2933 | if (rdev->bdev == rdev2->bdev && |
2934 | rdev != rdev2 && | |
2935 | overlaps(rdev->data_offset, rdev->sectors, | |
2936 | rdev2->data_offset, | |
2937 | rdev2->sectors)) { | |
c5d79adb N |
2938 | overlap = 1; |
2939 | break; | |
2940 | } | |
c5d79adb N |
2941 | if (overlap) { |
2942 | mddev_put(mddev); | |
2943 | break; | |
2944 | } | |
2945 | } | |
8b1afc3d | 2946 | rcu_read_unlock(); |
c5d79adb N |
2947 | if (overlap) { |
2948 | /* Someone else could have slipped in a size | |
2949 | * change here, but doing so is just silly. | |
dd8ac336 | 2950 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2951 | * safe, and trust userspace not to race with |
2952 | * itself | |
2953 | */ | |
dd8ac336 | 2954 | rdev->sectors = oldsectors; |
c5d79adb N |
2955 | return -EBUSY; |
2956 | } | |
2957 | } | |
83303b61 N |
2958 | return len; |
2959 | } | |
2960 | ||
2961 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2962 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2963 | |
3cb03002 | 2964 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
2965 | { |
2966 | unsigned long long recovery_start = rdev->recovery_offset; | |
2967 | ||
2968 | if (test_bit(In_sync, &rdev->flags) || | |
2969 | recovery_start == MaxSector) | |
2970 | return sprintf(page, "none\n"); | |
2971 | ||
2972 | return sprintf(page, "%llu\n", recovery_start); | |
2973 | } | |
2974 | ||
3cb03002 | 2975 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
2976 | { |
2977 | unsigned long long recovery_start; | |
2978 | ||
2979 | if (cmd_match(buf, "none")) | |
2980 | recovery_start = MaxSector; | |
b29bebd6 | 2981 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
2982 | return -EINVAL; |
2983 | ||
2984 | if (rdev->mddev->pers && | |
2985 | rdev->raid_disk >= 0) | |
2986 | return -EBUSY; | |
2987 | ||
2988 | rdev->recovery_offset = recovery_start; | |
2989 | if (recovery_start == MaxSector) | |
2990 | set_bit(In_sync, &rdev->flags); | |
2991 | else | |
2992 | clear_bit(In_sync, &rdev->flags); | |
2993 | return len; | |
2994 | } | |
2995 | ||
2996 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2997 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2998 | ||
16c791a5 N |
2999 | static ssize_t |
3000 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
3001 | static ssize_t | |
3002 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
3003 | ||
3cb03002 | 3004 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3005 | { |
3006 | return badblocks_show(&rdev->badblocks, page, 0); | |
3007 | } | |
3cb03002 | 3008 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 3009 | { |
de393cde N |
3010 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
3011 | /* Maybe that ack was all we needed */ | |
3012 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
3013 | wake_up(&rdev->blocked_wait); | |
3014 | return rv; | |
16c791a5 N |
3015 | } |
3016 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
3017 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
3018 | ||
3cb03002 | 3019 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3020 | { |
3021 | return badblocks_show(&rdev->badblocks, page, 1); | |
3022 | } | |
3cb03002 | 3023 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
3024 | { |
3025 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
3026 | } | |
3027 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
3028 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
3029 | ||
86e6ffdd N |
3030 | static struct attribute *rdev_default_attrs[] = { |
3031 | &rdev_state.attr, | |
4dbcdc75 | 3032 | &rdev_errors.attr, |
014236d2 | 3033 | &rdev_slot.attr, |
93c8cad0 | 3034 | &rdev_offset.attr, |
c6563a8c | 3035 | &rdev_new_offset.attr, |
83303b61 | 3036 | &rdev_size.attr, |
06e3c817 | 3037 | &rdev_recovery_start.attr, |
16c791a5 N |
3038 | &rdev_bad_blocks.attr, |
3039 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
3040 | NULL, |
3041 | }; | |
3042 | static ssize_t | |
3043 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3044 | { | |
3045 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3046 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
86e6ffdd N |
3047 | |
3048 | if (!entry->show) | |
3049 | return -EIO; | |
758bfc8a N |
3050 | if (!rdev->mddev) |
3051 | return -EBUSY; | |
3052 | return entry->show(rdev, page); | |
86e6ffdd N |
3053 | } |
3054 | ||
3055 | static ssize_t | |
3056 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
3057 | const char *page, size_t length) | |
3058 | { | |
3059 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3060 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 3061 | ssize_t rv; |
fd01b88c | 3062 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
3063 | |
3064 | if (!entry->store) | |
3065 | return -EIO; | |
67463acb N |
3066 | if (!capable(CAP_SYS_ADMIN)) |
3067 | return -EACCES; | |
27c529bb | 3068 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 3069 | if (!rv) { |
27c529bb N |
3070 | if (rdev->mddev == NULL) |
3071 | rv = -EBUSY; | |
3072 | else | |
3073 | rv = entry->store(rdev, page, length); | |
6a51830e | 3074 | mddev_unlock(mddev); |
ca388059 N |
3075 | } |
3076 | return rv; | |
86e6ffdd N |
3077 | } |
3078 | ||
3079 | static void rdev_free(struct kobject *ko) | |
3080 | { | |
3cb03002 | 3081 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3082 | kfree(rdev); |
3083 | } | |
52cf25d0 | 3084 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3085 | .show = rdev_attr_show, |
3086 | .store = rdev_attr_store, | |
3087 | }; | |
3088 | static struct kobj_type rdev_ktype = { | |
3089 | .release = rdev_free, | |
3090 | .sysfs_ops = &rdev_sysfs_ops, | |
3091 | .default_attrs = rdev_default_attrs, | |
3092 | }; | |
3093 | ||
3cb03002 | 3094 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3095 | { |
3096 | rdev->desc_nr = -1; | |
3097 | rdev->saved_raid_disk = -1; | |
3098 | rdev->raid_disk = -1; | |
3099 | rdev->flags = 0; | |
3100 | rdev->data_offset = 0; | |
c6563a8c | 3101 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3102 | rdev->sb_events = 0; |
3103 | rdev->last_read_error.tv_sec = 0; | |
3104 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3105 | rdev->sb_loaded = 0; |
3106 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3107 | atomic_set(&rdev->nr_pending, 0); |
3108 | atomic_set(&rdev->read_errors, 0); | |
3109 | atomic_set(&rdev->corrected_errors, 0); | |
3110 | ||
3111 | INIT_LIST_HEAD(&rdev->same_set); | |
3112 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3113 | |
3114 | /* Add space to store bad block list. | |
3115 | * This reserves the space even on arrays where it cannot | |
3116 | * be used - I wonder if that matters | |
3117 | */ | |
3118 | rdev->badblocks.count = 0; | |
486adf72 | 3119 | rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
2230dfe4 N |
3120 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3121 | seqlock_init(&rdev->badblocks.lock); | |
3122 | if (rdev->badblocks.page == NULL) | |
3123 | return -ENOMEM; | |
3124 | ||
3125 | return 0; | |
e8bb9a83 N |
3126 | } |
3127 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3128 | /* |
3129 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3130 | * | |
3131 | * mark the device faulty if: | |
3132 | * | |
3133 | * - the device is nonexistent (zero size) | |
3134 | * - the device has no valid superblock | |
3135 | * | |
3136 | * a faulty rdev _never_ has rdev->sb set. | |
3137 | */ | |
3cb03002 | 3138 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3139 | { |
3140 | char b[BDEVNAME_SIZE]; | |
3141 | int err; | |
3cb03002 | 3142 | struct md_rdev *rdev; |
1da177e4 LT |
3143 | sector_t size; |
3144 | ||
9ffae0cf | 3145 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3146 | if (!rdev) { |
3147 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3148 | return ERR_PTR(-ENOMEM); | |
3149 | } | |
1da177e4 | 3150 | |
2230dfe4 N |
3151 | err = md_rdev_init(rdev); |
3152 | if (err) | |
3153 | goto abort_free; | |
3154 | err = alloc_disk_sb(rdev); | |
3155 | if (err) | |
1da177e4 LT |
3156 | goto abort_free; |
3157 | ||
c5d79adb | 3158 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3159 | if (err) |
3160 | goto abort_free; | |
3161 | ||
f9cb074b | 3162 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3163 | |
77304d2a | 3164 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3165 | if (!size) { |
f72ffdd6 | 3166 | printk(KERN_WARNING |
1da177e4 LT |
3167 | "md: %s has zero or unknown size, marking faulty!\n", |
3168 | bdevname(rdev->bdev,b)); | |
3169 | err = -EINVAL; | |
3170 | goto abort_free; | |
3171 | } | |
3172 | ||
3173 | if (super_format >= 0) { | |
3174 | err = super_types[super_format]. | |
3175 | load_super(rdev, NULL, super_minor); | |
3176 | if (err == -EINVAL) { | |
df968c4e N |
3177 | printk(KERN_WARNING |
3178 | "md: %s does not have a valid v%d.%d " | |
3179 | "superblock, not importing!\n", | |
3180 | bdevname(rdev->bdev,b), | |
3181 | super_format, super_minor); | |
1da177e4 LT |
3182 | goto abort_free; |
3183 | } | |
3184 | if (err < 0) { | |
f72ffdd6 | 3185 | printk(KERN_WARNING |
1da177e4 LT |
3186 | "md: could not read %s's sb, not importing!\n", |
3187 | bdevname(rdev->bdev,b)); | |
3188 | goto abort_free; | |
3189 | } | |
3190 | } | |
6bfe0b49 | 3191 | |
1da177e4 LT |
3192 | return rdev; |
3193 | ||
3194 | abort_free: | |
2699b672 N |
3195 | if (rdev->bdev) |
3196 | unlock_rdev(rdev); | |
545c8795 | 3197 | md_rdev_clear(rdev); |
1da177e4 LT |
3198 | kfree(rdev); |
3199 | return ERR_PTR(err); | |
3200 | } | |
3201 | ||
3202 | /* | |
3203 | * Check a full RAID array for plausibility | |
3204 | */ | |
3205 | ||
f72ffdd6 | 3206 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3207 | { |
3208 | int i; | |
3cb03002 | 3209 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3210 | char b[BDEVNAME_SIZE]; |
3211 | ||
3212 | freshest = NULL; | |
dafb20fa | 3213 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3214 | switch (super_types[mddev->major_version]. |
3215 | load_super(rdev, freshest, mddev->minor_version)) { | |
3216 | case 1: | |
3217 | freshest = rdev; | |
3218 | break; | |
3219 | case 0: | |
3220 | break; | |
3221 | default: | |
3222 | printk( KERN_ERR \ | |
3223 | "md: fatal superblock inconsistency in %s" | |
f72ffdd6 | 3224 | " -- removing from array\n", |
1da177e4 | 3225 | bdevname(rdev->bdev,b)); |
fb56dfef | 3226 | md_kick_rdev_from_array(rdev); |
1da177e4 LT |
3227 | } |
3228 | ||
1da177e4 LT |
3229 | super_types[mddev->major_version]. |
3230 | validate_super(mddev, freshest); | |
3231 | ||
3232 | i = 0; | |
dafb20fa | 3233 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3234 | if (mddev->max_disks && |
3235 | (rdev->desc_nr >= mddev->max_disks || | |
3236 | i > mddev->max_disks)) { | |
de01dfad N |
3237 | printk(KERN_WARNING |
3238 | "md: %s: %s: only %d devices permitted\n", | |
3239 | mdname(mddev), bdevname(rdev->bdev, b), | |
3240 | mddev->max_disks); | |
fb56dfef | 3241 | md_kick_rdev_from_array(rdev); |
de01dfad N |
3242 | continue; |
3243 | } | |
1aee41f6 | 3244 | if (rdev != freshest) { |
1da177e4 LT |
3245 | if (super_types[mddev->major_version]. |
3246 | validate_super(mddev, rdev)) { | |
3247 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3248 | " from array!\n", | |
3249 | bdevname(rdev->bdev,b)); | |
fb56dfef | 3250 | md_kick_rdev_from_array(rdev); |
1da177e4 LT |
3251 | continue; |
3252 | } | |
1aee41f6 | 3253 | } |
1da177e4 LT |
3254 | if (mddev->level == LEVEL_MULTIPATH) { |
3255 | rdev->desc_nr = i++; | |
3256 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3257 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3258 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3259 | rdev->raid_disk = -1; |
3260 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3261 | } |
3262 | } | |
1da177e4 LT |
3263 | } |
3264 | ||
72e02075 N |
3265 | /* Read a fixed-point number. |
3266 | * Numbers in sysfs attributes should be in "standard" units where | |
3267 | * possible, so time should be in seconds. | |
f72ffdd6 | 3268 | * However we internally use a a much smaller unit such as |
72e02075 N |
3269 | * milliseconds or jiffies. |
3270 | * This function takes a decimal number with a possible fractional | |
3271 | * component, and produces an integer which is the result of | |
3272 | * multiplying that number by 10^'scale'. | |
3273 | * all without any floating-point arithmetic. | |
3274 | */ | |
3275 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3276 | { | |
3277 | unsigned long result = 0; | |
3278 | long decimals = -1; | |
3279 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3280 | if (*cp == '.') | |
3281 | decimals = 0; | |
3282 | else if (decimals < scale) { | |
3283 | unsigned int value; | |
3284 | value = *cp - '0'; | |
3285 | result = result * 10 + value; | |
3286 | if (decimals >= 0) | |
3287 | decimals++; | |
3288 | } | |
3289 | cp++; | |
3290 | } | |
3291 | if (*cp == '\n') | |
3292 | cp++; | |
3293 | if (*cp) | |
3294 | return -EINVAL; | |
3295 | if (decimals < 0) | |
3296 | decimals = 0; | |
3297 | while (decimals < scale) { | |
3298 | result *= 10; | |
3299 | decimals ++; | |
3300 | } | |
3301 | *res = result; | |
3302 | return 0; | |
3303 | } | |
3304 | ||
16f17b39 | 3305 | static ssize_t |
fd01b88c | 3306 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3307 | { |
3308 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3309 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3310 | } | |
3311 | static ssize_t | |
fd01b88c | 3312 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3313 | { |
16f17b39 | 3314 | unsigned long msec; |
97ce0a7f | 3315 | |
28c1b9fd GR |
3316 | if (mddev_is_clustered(mddev)) { |
3317 | pr_info("md: Safemode is disabled for clustered mode\n"); | |
3318 | return -EINVAL; | |
3319 | } | |
3320 | ||
72e02075 | 3321 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3322 | return -EINVAL; |
16f17b39 N |
3323 | if (msec == 0) |
3324 | mddev->safemode_delay = 0; | |
3325 | else { | |
19052c0e | 3326 | unsigned long old_delay = mddev->safemode_delay; |
1b30e66f N |
3327 | unsigned long new_delay = (msec*HZ)/1000; |
3328 | ||
3329 | if (new_delay == 0) | |
3330 | new_delay = 1; | |
3331 | mddev->safemode_delay = new_delay; | |
3332 | if (new_delay < old_delay || old_delay == 0) | |
3333 | mod_timer(&mddev->safemode_timer, jiffies+1); | |
16f17b39 N |
3334 | } |
3335 | return len; | |
3336 | } | |
3337 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3338 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3339 | |
eae1701f | 3340 | static ssize_t |
fd01b88c | 3341 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3342 | { |
36d091f4 N |
3343 | struct md_personality *p; |
3344 | int ret; | |
3345 | spin_lock(&mddev->lock); | |
3346 | p = mddev->pers; | |
d9d166c2 | 3347 | if (p) |
36d091f4 | 3348 | ret = sprintf(page, "%s\n", p->name); |
d9d166c2 | 3349 | else if (mddev->clevel[0]) |
36d091f4 | 3350 | ret = sprintf(page, "%s\n", mddev->clevel); |
d9d166c2 | 3351 | else if (mddev->level != LEVEL_NONE) |
36d091f4 | 3352 | ret = sprintf(page, "%d\n", mddev->level); |
d9d166c2 | 3353 | else |
36d091f4 N |
3354 | ret = 0; |
3355 | spin_unlock(&mddev->lock); | |
3356 | return ret; | |
eae1701f N |
3357 | } |
3358 | ||
d9d166c2 | 3359 | static ssize_t |
fd01b88c | 3360 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3361 | { |
f2859af6 | 3362 | char clevel[16]; |
6791875e N |
3363 | ssize_t rv; |
3364 | size_t slen = len; | |
db721d32 | 3365 | struct md_personality *pers, *oldpers; |
f2859af6 | 3366 | long level; |
db721d32 | 3367 | void *priv, *oldpriv; |
3cb03002 | 3368 | struct md_rdev *rdev; |
245f46c2 | 3369 | |
6791875e N |
3370 | if (slen == 0 || slen >= sizeof(clevel)) |
3371 | return -EINVAL; | |
3372 | ||
3373 | rv = mddev_lock(mddev); | |
3374 | if (rv) | |
3375 | return rv; | |
3376 | ||
245f46c2 | 3377 | if (mddev->pers == NULL) { |
6791875e N |
3378 | strncpy(mddev->clevel, buf, slen); |
3379 | if (mddev->clevel[slen-1] == '\n') | |
3380 | slen--; | |
3381 | mddev->clevel[slen] = 0; | |
245f46c2 | 3382 | mddev->level = LEVEL_NONE; |
6791875e N |
3383 | rv = len; |
3384 | goto out_unlock; | |
245f46c2 | 3385 | } |
6791875e | 3386 | rv = -EROFS; |
bd8839e0 | 3387 | if (mddev->ro) |
6791875e | 3388 | goto out_unlock; |
245f46c2 N |
3389 | |
3390 | /* request to change the personality. Need to ensure: | |
3391 | * - array is not engaged in resync/recovery/reshape | |
3392 | * - old personality can be suspended | |
3393 | * - new personality will access other array. | |
3394 | */ | |
3395 | ||
6791875e | 3396 | rv = -EBUSY; |
bb4f1e9d | 3397 | if (mddev->sync_thread || |
f851b60d | 3398 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3399 | mddev->reshape_position != MaxSector || |
3400 | mddev->sysfs_active) | |
6791875e | 3401 | goto out_unlock; |
245f46c2 | 3402 | |
6791875e | 3403 | rv = -EINVAL; |
245f46c2 N |
3404 | if (!mddev->pers->quiesce) { |
3405 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3406 | mdname(mddev), mddev->pers->name); | |
6791875e | 3407 | goto out_unlock; |
245f46c2 N |
3408 | } |
3409 | ||
3410 | /* Now find the new personality */ | |
6791875e N |
3411 | strncpy(clevel, buf, slen); |
3412 | if (clevel[slen-1] == '\n') | |
3413 | slen--; | |
3414 | clevel[slen] = 0; | |
b29bebd6 | 3415 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3416 | level = LEVEL_NONE; |
245f46c2 | 3417 | |
f2859af6 DW |
3418 | if (request_module("md-%s", clevel) != 0) |
3419 | request_module("md-level-%s", clevel); | |
245f46c2 | 3420 | spin_lock(&pers_lock); |
f2859af6 | 3421 | pers = find_pers(level, clevel); |
245f46c2 N |
3422 | if (!pers || !try_module_get(pers->owner)) { |
3423 | spin_unlock(&pers_lock); | |
f2859af6 | 3424 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
6791875e N |
3425 | rv = -EINVAL; |
3426 | goto out_unlock; | |
245f46c2 N |
3427 | } |
3428 | spin_unlock(&pers_lock); | |
3429 | ||
3430 | if (pers == mddev->pers) { | |
3431 | /* Nothing to do! */ | |
3432 | module_put(pers->owner); | |
6791875e N |
3433 | rv = len; |
3434 | goto out_unlock; | |
245f46c2 N |
3435 | } |
3436 | if (!pers->takeover) { | |
3437 | module_put(pers->owner); | |
3438 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3439 | mdname(mddev), clevel); |
6791875e N |
3440 | rv = -EINVAL; |
3441 | goto out_unlock; | |
245f46c2 N |
3442 | } |
3443 | ||
dafb20fa | 3444 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3445 | rdev->new_raid_disk = rdev->raid_disk; |
3446 | ||
245f46c2 N |
3447 | /* ->takeover must set new_* and/or delta_disks |
3448 | * if it succeeds, and may set them when it fails. | |
3449 | */ | |
3450 | priv = pers->takeover(mddev); | |
3451 | if (IS_ERR(priv)) { | |
3452 | mddev->new_level = mddev->level; | |
3453 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3454 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3455 | mddev->raid_disks -= mddev->delta_disks; |
3456 | mddev->delta_disks = 0; | |
2c810cdd | 3457 | mddev->reshape_backwards = 0; |
245f46c2 N |
3458 | module_put(pers->owner); |
3459 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3460 | mdname(mddev), clevel); |
6791875e N |
3461 | rv = PTR_ERR(priv); |
3462 | goto out_unlock; | |
245f46c2 N |
3463 | } |
3464 | ||
3465 | /* Looks like we have a winner */ | |
3466 | mddev_suspend(mddev); | |
5aa61f42 | 3467 | mddev_detach(mddev); |
36d091f4 N |
3468 | |
3469 | spin_lock(&mddev->lock); | |
db721d32 N |
3470 | oldpers = mddev->pers; |
3471 | oldpriv = mddev->private; | |
3472 | mddev->pers = pers; | |
3473 | mddev->private = priv; | |
3474 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3475 | mddev->level = mddev->new_level; | |
3476 | mddev->layout = mddev->new_layout; | |
3477 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
3478 | mddev->delta_disks = 0; | |
3479 | mddev->reshape_backwards = 0; | |
3480 | mddev->degraded = 0; | |
36d091f4 | 3481 | spin_unlock(&mddev->lock); |
db721d32 N |
3482 | |
3483 | if (oldpers->sync_request == NULL && | |
3484 | mddev->external) { | |
3485 | /* We are converting from a no-redundancy array | |
3486 | * to a redundancy array and metadata is managed | |
3487 | * externally so we need to be sure that writes | |
3488 | * won't block due to a need to transition | |
3489 | * clean->dirty | |
3490 | * until external management is started. | |
3491 | */ | |
3492 | mddev->in_sync = 0; | |
3493 | mddev->safemode_delay = 0; | |
3494 | mddev->safemode = 0; | |
3495 | } | |
f72ffdd6 | 3496 | |
db721d32 N |
3497 | oldpers->free(mddev, oldpriv); |
3498 | ||
3499 | if (oldpers->sync_request == NULL && | |
a64c876f N |
3500 | pers->sync_request != NULL) { |
3501 | /* need to add the md_redundancy_group */ | |
3502 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3503 | printk(KERN_WARNING | |
3504 | "md: cannot register extra attributes for %s\n", | |
3505 | mdname(mddev)); | |
388975cc | 3506 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3507 | } |
db721d32 | 3508 | if (oldpers->sync_request != NULL && |
a64c876f N |
3509 | pers->sync_request == NULL) { |
3510 | /* need to remove the md_redundancy_group */ | |
3511 | if (mddev->to_remove == NULL) | |
3512 | mddev->to_remove = &md_redundancy_group; | |
3513 | } | |
3514 | ||
dafb20fa | 3515 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3516 | if (rdev->raid_disk < 0) |
3517 | continue; | |
bf2cb0da | 3518 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3519 | rdev->new_raid_disk = -1; |
3520 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3521 | continue; | |
36fad858 | 3522 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3523 | } |
dafb20fa | 3524 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3525 | if (rdev->raid_disk < 0) |
3526 | continue; | |
3527 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3528 | continue; | |
3529 | rdev->raid_disk = rdev->new_raid_disk; | |
3530 | if (rdev->raid_disk < 0) | |
3a981b03 | 3531 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3532 | else { |
36fad858 NK |
3533 | if (sysfs_link_rdev(mddev, rdev)) |
3534 | printk(KERN_WARNING "md: cannot register rd%d" | |
3535 | " for %s after level change\n", | |
3536 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3537 | } |
e93f68a1 N |
3538 | } |
3539 | ||
db721d32 | 3540 | if (pers->sync_request == NULL) { |
9af204cf TM |
3541 | /* this is now an array without redundancy, so |
3542 | * it must always be in_sync | |
3543 | */ | |
3544 | mddev->in_sync = 1; | |
3545 | del_timer_sync(&mddev->safemode_timer); | |
3546 | } | |
02e5f5c0 | 3547 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3548 | pers->run(mddev); |
245f46c2 | 3549 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3550 | mddev_resume(mddev); |
830778a1 N |
3551 | if (!mddev->thread) |
3552 | md_update_sb(mddev, 1); | |
5cac7861 | 3553 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3554 | md_new_event(mddev); |
6791875e N |
3555 | rv = len; |
3556 | out_unlock: | |
3557 | mddev_unlock(mddev); | |
d9d166c2 N |
3558 | return rv; |
3559 | } | |
3560 | ||
3561 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3562 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3563 | |
d4dbd025 | 3564 | static ssize_t |
fd01b88c | 3565 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3566 | { |
3567 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3568 | if (mddev->reshape_position != MaxSector && |
3569 | mddev->layout != mddev->new_layout) | |
3570 | return sprintf(page, "%d (%d)\n", | |
3571 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3572 | return sprintf(page, "%d\n", mddev->layout); |
3573 | } | |
3574 | ||
3575 | static ssize_t | |
fd01b88c | 3576 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 | 3577 | { |
4c9309c0 | 3578 | unsigned int n; |
6791875e | 3579 | int err; |
d4dbd025 | 3580 | |
4c9309c0 AD |
3581 | err = kstrtouint(buf, 10, &n); |
3582 | if (err < 0) | |
3583 | return err; | |
6791875e N |
3584 | err = mddev_lock(mddev); |
3585 | if (err) | |
3586 | return err; | |
d4dbd025 | 3587 | |
b3546035 | 3588 | if (mddev->pers) { |
50ac168a | 3589 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3590 | err = -EBUSY; |
3591 | else if (mddev->ro) | |
3592 | err = -EROFS; | |
3593 | else { | |
3594 | mddev->new_layout = n; | |
3595 | err = mddev->pers->check_reshape(mddev); | |
3596 | if (err) | |
3597 | mddev->new_layout = mddev->layout; | |
597a711b | 3598 | } |
b3546035 | 3599 | } else { |
08a02ecd | 3600 | mddev->new_layout = n; |
b3546035 N |
3601 | if (mddev->reshape_position == MaxSector) |
3602 | mddev->layout = n; | |
3603 | } | |
6791875e N |
3604 | mddev_unlock(mddev); |
3605 | return err ?: len; | |
d4dbd025 N |
3606 | } |
3607 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3608 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3609 | |
eae1701f | 3610 | static ssize_t |
fd01b88c | 3611 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3612 | { |
bb636547 N |
3613 | if (mddev->raid_disks == 0) |
3614 | return 0; | |
08a02ecd N |
3615 | if (mddev->reshape_position != MaxSector && |
3616 | mddev->delta_disks != 0) | |
3617 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3618 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3619 | return sprintf(page, "%d\n", mddev->raid_disks); |
3620 | } | |
3621 | ||
fd01b88c | 3622 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3623 | |
3624 | static ssize_t | |
fd01b88c | 3625 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3626 | { |
4c9309c0 | 3627 | unsigned int n; |
6791875e | 3628 | int err; |
da943b99 | 3629 | |
4c9309c0 AD |
3630 | err = kstrtouint(buf, 10, &n); |
3631 | if (err < 0) | |
3632 | return err; | |
da943b99 | 3633 | |
6791875e N |
3634 | err = mddev_lock(mddev); |
3635 | if (err) | |
3636 | return err; | |
da943b99 | 3637 | if (mddev->pers) |
6791875e | 3638 | err = update_raid_disks(mddev, n); |
08a02ecd | 3639 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3640 | struct md_rdev *rdev; |
08a02ecd | 3641 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c | 3642 | |
6791875e | 3643 | err = -EINVAL; |
c6563a8c N |
3644 | rdev_for_each(rdev, mddev) { |
3645 | if (olddisks < n && | |
3646 | rdev->data_offset < rdev->new_data_offset) | |
6791875e | 3647 | goto out_unlock; |
c6563a8c N |
3648 | if (olddisks > n && |
3649 | rdev->data_offset > rdev->new_data_offset) | |
6791875e | 3650 | goto out_unlock; |
c6563a8c | 3651 | } |
6791875e | 3652 | err = 0; |
08a02ecd N |
3653 | mddev->delta_disks = n - olddisks; |
3654 | mddev->raid_disks = n; | |
2c810cdd | 3655 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3656 | } else |
da943b99 | 3657 | mddev->raid_disks = n; |
6791875e N |
3658 | out_unlock: |
3659 | mddev_unlock(mddev); | |
3660 | return err ? err : len; | |
da943b99 N |
3661 | } |
3662 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3663 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3664 | |
3b34380a | 3665 | static ssize_t |
fd01b88c | 3666 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3667 | { |
08a02ecd | 3668 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3669 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3670 | return sprintf(page, "%d (%d)\n", | |
3671 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3672 | mddev->chunk_sectors << 9); |
3673 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3674 | } |
3675 | ||
3676 | static ssize_t | |
fd01b88c | 3677 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3678 | { |
4c9309c0 | 3679 | unsigned long n; |
6791875e | 3680 | int err; |
3b34380a | 3681 | |
4c9309c0 AD |
3682 | err = kstrtoul(buf, 10, &n); |
3683 | if (err < 0) | |
3684 | return err; | |
3b34380a | 3685 | |
6791875e N |
3686 | err = mddev_lock(mddev); |
3687 | if (err) | |
3688 | return err; | |
b3546035 | 3689 | if (mddev->pers) { |
50ac168a | 3690 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3691 | err = -EBUSY; |
3692 | else if (mddev->ro) | |
3693 | err = -EROFS; | |
3694 | else { | |
3695 | mddev->new_chunk_sectors = n >> 9; | |
3696 | err = mddev->pers->check_reshape(mddev); | |
3697 | if (err) | |
3698 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
597a711b | 3699 | } |
b3546035 | 3700 | } else { |
664e7c41 | 3701 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3702 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3703 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3704 | } |
6791875e N |
3705 | mddev_unlock(mddev); |
3706 | return err ?: len; | |
3b34380a N |
3707 | } |
3708 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3709 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3710 | |
a94213b1 | 3711 | static ssize_t |
fd01b88c | 3712 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3713 | { |
d1a7c503 N |
3714 | if (mddev->recovery_cp == MaxSector) |
3715 | return sprintf(page, "none\n"); | |
a94213b1 N |
3716 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3717 | } | |
3718 | ||
3719 | static ssize_t | |
fd01b88c | 3720 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3721 | { |
4c9309c0 | 3722 | unsigned long long n; |
6791875e | 3723 | int err; |
4c9309c0 AD |
3724 | |
3725 | if (cmd_match(buf, "none")) | |
3726 | n = MaxSector; | |
3727 | else { | |
3728 | err = kstrtoull(buf, 10, &n); | |
3729 | if (err < 0) | |
3730 | return err; | |
3731 | if (n != (sector_t)n) | |
3732 | return -EINVAL; | |
3733 | } | |
a94213b1 | 3734 | |
6791875e N |
3735 | err = mddev_lock(mddev); |
3736 | if (err) | |
3737 | return err; | |
b098636c | 3738 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6791875e | 3739 | err = -EBUSY; |
a94213b1 | 3740 | |
6791875e N |
3741 | if (!err) { |
3742 | mddev->recovery_cp = n; | |
3743 | if (mddev->pers) | |
3744 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3745 | } | |
3746 | mddev_unlock(mddev); | |
3747 | return err ?: len; | |
a94213b1 N |
3748 | } |
3749 | static struct md_sysfs_entry md_resync_start = | |
750f199e N |
3750 | __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, |
3751 | resync_start_show, resync_start_store); | |
a94213b1 | 3752 | |
9e653b63 N |
3753 | /* |
3754 | * The array state can be: | |
3755 | * | |
3756 | * clear | |
3757 | * No devices, no size, no level | |
3758 | * Equivalent to STOP_ARRAY ioctl | |
3759 | * inactive | |
3760 | * May have some settings, but array is not active | |
3761 | * all IO results in error | |
3762 | * When written, doesn't tear down array, but just stops it | |
3763 | * suspended (not supported yet) | |
3764 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3765 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3766 | * readonly |
3767 | * no resync can happen. no superblocks get written. | |
3768 | * write requests fail | |
3769 | * read-auto | |
3770 | * like readonly, but behaves like 'clean' on a write request. | |
3771 | * | |
3772 | * clean - no pending writes, but otherwise active. | |
3773 | * When written to inactive array, starts without resync | |
3774 | * If a write request arrives then | |
3775 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3776 | * if not known, block and switch to write-pending | |
3777 | * If written to an active array that has pending writes, then fails. | |
3778 | * active | |
3779 | * fully active: IO and resync can be happening. | |
3780 | * When written to inactive array, starts with resync | |
3781 | * | |
3782 | * write-pending | |
3783 | * clean, but writes are blocked waiting for 'active' to be written. | |
3784 | * | |
3785 | * active-idle | |
3786 | * like active, but no writes have been seen for a while (100msec). | |
3787 | * | |
3788 | */ | |
3789 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3790 | write_pending, active_idle, bad_word}; | |
05381954 | 3791 | static char *array_states[] = { |
9e653b63 N |
3792 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3793 | "write-pending", "active-idle", NULL }; | |
3794 | ||
3795 | static int match_word(const char *word, char **list) | |
3796 | { | |
3797 | int n; | |
3798 | for (n=0; list[n]; n++) | |
3799 | if (cmd_match(word, list[n])) | |
3800 | break; | |
3801 | return n; | |
3802 | } | |
3803 | ||
3804 | static ssize_t | |
fd01b88c | 3805 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3806 | { |
3807 | enum array_state st = inactive; | |
3808 | ||
3809 | if (mddev->pers) | |
3810 | switch(mddev->ro) { | |
3811 | case 1: | |
3812 | st = readonly; | |
3813 | break; | |
3814 | case 2: | |
3815 | st = read_auto; | |
3816 | break; | |
3817 | case 0: | |
3818 | if (mddev->in_sync) | |
3819 | st = clean; | |
070dc6dd | 3820 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3821 | st = write_pending; |
9e653b63 N |
3822 | else if (mddev->safemode) |
3823 | st = active_idle; | |
3824 | else | |
3825 | st = active; | |
3826 | } | |
3827 | else { | |
3828 | if (list_empty(&mddev->disks) && | |
3829 | mddev->raid_disks == 0 && | |
58c0fed4 | 3830 | mddev->dev_sectors == 0) |
9e653b63 N |
3831 | st = clear; |
3832 | else | |
3833 | st = inactive; | |
3834 | } | |
3835 | return sprintf(page, "%s\n", array_states[st]); | |
3836 | } | |
3837 | ||
f72ffdd6 N |
3838 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
3839 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
3840 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 3841 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
3842 | |
3843 | static ssize_t | |
fd01b88c | 3844 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 | 3845 | { |
6791875e | 3846 | int err; |
9e653b63 | 3847 | enum array_state st = match_word(buf, array_states); |
6791875e N |
3848 | |
3849 | if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { | |
3850 | /* don't take reconfig_mutex when toggling between | |
3851 | * clean and active | |
3852 | */ | |
3853 | spin_lock(&mddev->lock); | |
3854 | if (st == active) { | |
3855 | restart_array(mddev); | |
3856 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3857 | wake_up(&mddev->sb_wait); | |
3858 | err = 0; | |
3859 | } else /* st == clean */ { | |
3860 | restart_array(mddev); | |
3861 | if (atomic_read(&mddev->writes_pending) == 0) { | |
3862 | if (mddev->in_sync == 0) { | |
3863 | mddev->in_sync = 1; | |
3864 | if (mddev->safemode == 1) | |
3865 | mddev->safemode = 0; | |
3866 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3867 | } | |
3868 | err = 0; | |
3869 | } else | |
3870 | err = -EBUSY; | |
3871 | } | |
3872 | spin_unlock(&mddev->lock); | |
c008f1d3 | 3873 | return err ?: len; |
6791875e N |
3874 | } |
3875 | err = mddev_lock(mddev); | |
3876 | if (err) | |
3877 | return err; | |
3878 | err = -EINVAL; | |
9e653b63 N |
3879 | switch(st) { |
3880 | case bad_word: | |
3881 | break; | |
3882 | case clear: | |
3883 | /* stopping an active array */ | |
a05b7ea0 | 3884 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3885 | break; |
3886 | case inactive: | |
3887 | /* stopping an active array */ | |
90cf195d | 3888 | if (mddev->pers) |
a05b7ea0 | 3889 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3890 | else |
e691063a | 3891 | err = 0; /* already inactive */ |
9e653b63 N |
3892 | break; |
3893 | case suspended: | |
3894 | break; /* not supported yet */ | |
3895 | case readonly: | |
3896 | if (mddev->pers) | |
a05b7ea0 | 3897 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3898 | else { |
3899 | mddev->ro = 1; | |
648b629e | 3900 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3901 | err = do_md_run(mddev); |
3902 | } | |
3903 | break; | |
3904 | case read_auto: | |
9e653b63 | 3905 | if (mddev->pers) { |
80268ee9 | 3906 | if (mddev->ro == 0) |
a05b7ea0 | 3907 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3908 | else if (mddev->ro == 1) |
648b629e N |
3909 | err = restart_array(mddev); |
3910 | if (err == 0) { | |
3911 | mddev->ro = 2; | |
3912 | set_disk_ro(mddev->gendisk, 0); | |
3913 | } | |
9e653b63 N |
3914 | } else { |
3915 | mddev->ro = 2; | |
3916 | err = do_md_run(mddev); | |
3917 | } | |
3918 | break; | |
3919 | case clean: | |
3920 | if (mddev->pers) { | |
3921 | restart_array(mddev); | |
85572d7c | 3922 | spin_lock(&mddev->lock); |
9e653b63 | 3923 | if (atomic_read(&mddev->writes_pending) == 0) { |
e691063a N |
3924 | if (mddev->in_sync == 0) { |
3925 | mddev->in_sync = 1; | |
31a59e34 N |
3926 | if (mddev->safemode == 1) |
3927 | mddev->safemode = 0; | |
070dc6dd | 3928 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3929 | } |
3930 | err = 0; | |
3931 | } else | |
3932 | err = -EBUSY; | |
85572d7c | 3933 | spin_unlock(&mddev->lock); |
5bf29597 N |
3934 | } else |
3935 | err = -EINVAL; | |
9e653b63 N |
3936 | break; |
3937 | case active: | |
3938 | if (mddev->pers) { | |
3939 | restart_array(mddev); | |
070dc6dd | 3940 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3941 | wake_up(&mddev->sb_wait); |
3942 | err = 0; | |
3943 | } else { | |
3944 | mddev->ro = 0; | |
648b629e | 3945 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3946 | err = do_md_run(mddev); |
3947 | } | |
3948 | break; | |
3949 | case write_pending: | |
3950 | case active_idle: | |
3951 | /* these cannot be set */ | |
3952 | break; | |
3953 | } | |
6791875e N |
3954 | |
3955 | if (!err) { | |
1d23f178 N |
3956 | if (mddev->hold_active == UNTIL_IOCTL) |
3957 | mddev->hold_active = 0; | |
00bcb4ac | 3958 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 3959 | } |
6791875e N |
3960 | mddev_unlock(mddev); |
3961 | return err ?: len; | |
9e653b63 | 3962 | } |
80ca3a44 | 3963 | static struct md_sysfs_entry md_array_state = |
750f199e | 3964 | __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); |
9e653b63 | 3965 | |
1e50915f | 3966 | static ssize_t |
fd01b88c | 3967 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3968 | return sprintf(page, "%d\n", |
3969 | atomic_read(&mddev->max_corr_read_errors)); | |
3970 | } | |
3971 | ||
3972 | static ssize_t | |
fd01b88c | 3973 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f | 3974 | { |
4c9309c0 AD |
3975 | unsigned int n; |
3976 | int rv; | |
1e50915f | 3977 | |
4c9309c0 AD |
3978 | rv = kstrtouint(buf, 10, &n); |
3979 | if (rv < 0) | |
3980 | return rv; | |
3981 | atomic_set(&mddev->max_corr_read_errors, n); | |
3982 | return len; | |
1e50915f RB |
3983 | } |
3984 | ||
3985 | static struct md_sysfs_entry max_corr_read_errors = | |
3986 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3987 | max_corrected_read_errors_store); | |
3988 | ||
6d7ff738 | 3989 | static ssize_t |
fd01b88c | 3990 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3991 | { |
3992 | return -EINVAL; | |
3993 | } | |
3994 | ||
3995 | static ssize_t | |
fd01b88c | 3996 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
3997 | { |
3998 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3999 | /* The new device is added to the array. | |
4000 | * If the array has a persistent superblock, we read the | |
4001 | * superblock to initialise info and check validity. | |
4002 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
4003 | * which mainly checks size. | |
4004 | */ | |
4005 | char *e; | |
4006 | int major = simple_strtoul(buf, &e, 10); | |
4007 | int minor; | |
4008 | dev_t dev; | |
3cb03002 | 4009 | struct md_rdev *rdev; |
6d7ff738 N |
4010 | int err; |
4011 | ||
4012 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
4013 | return -EINVAL; | |
4014 | minor = simple_strtoul(e+1, &e, 10); | |
4015 | if (*e && *e != '\n') | |
4016 | return -EINVAL; | |
4017 | dev = MKDEV(major, minor); | |
4018 | if (major != MAJOR(dev) || | |
4019 | minor != MINOR(dev)) | |
4020 | return -EOVERFLOW; | |
4021 | ||
6791875e N |
4022 | flush_workqueue(md_misc_wq); |
4023 | ||
4024 | err = mddev_lock(mddev); | |
4025 | if (err) | |
4026 | return err; | |
6d7ff738 N |
4027 | if (mddev->persistent) { |
4028 | rdev = md_import_device(dev, mddev->major_version, | |
4029 | mddev->minor_version); | |
4030 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
4031 | struct md_rdev *rdev0 |
4032 | = list_entry(mddev->disks.next, | |
4033 | struct md_rdev, same_set); | |
6d7ff738 N |
4034 | err = super_types[mddev->major_version] |
4035 | .load_super(rdev, rdev0, mddev->minor_version); | |
4036 | if (err < 0) | |
4037 | goto out; | |
4038 | } | |
c5d79adb N |
4039 | } else if (mddev->external) |
4040 | rdev = md_import_device(dev, -2, -1); | |
4041 | else | |
6d7ff738 N |
4042 | rdev = md_import_device(dev, -1, -1); |
4043 | ||
9a8c0fa8 N |
4044 | if (IS_ERR(rdev)) { |
4045 | mddev_unlock(mddev); | |
6d7ff738 | 4046 | return PTR_ERR(rdev); |
9a8c0fa8 | 4047 | } |
6d7ff738 N |
4048 | err = bind_rdev_to_array(rdev, mddev); |
4049 | out: | |
4050 | if (err) | |
4051 | export_rdev(rdev); | |
6791875e | 4052 | mddev_unlock(mddev); |
6d7ff738 N |
4053 | return err ? err : len; |
4054 | } | |
4055 | ||
4056 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 4057 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 4058 | |
9b1d1dac | 4059 | static ssize_t |
fd01b88c | 4060 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
4061 | { |
4062 | char *end; | |
4063 | unsigned long chunk, end_chunk; | |
6791875e | 4064 | int err; |
9b1d1dac | 4065 | |
6791875e N |
4066 | err = mddev_lock(mddev); |
4067 | if (err) | |
4068 | return err; | |
9b1d1dac PC |
4069 | if (!mddev->bitmap) |
4070 | goto out; | |
4071 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
4072 | while (*buf) { | |
4073 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
4074 | if (buf == end) break; | |
4075 | if (*end == '-') { /* range */ | |
4076 | buf = end + 1; | |
4077 | end_chunk = simple_strtoul(buf, &end, 0); | |
4078 | if (buf == end) break; | |
4079 | } | |
4080 | if (*end && !isspace(*end)) break; | |
4081 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 4082 | buf = skip_spaces(end); |
9b1d1dac PC |
4083 | } |
4084 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
4085 | out: | |
6791875e | 4086 | mddev_unlock(mddev); |
9b1d1dac PC |
4087 | return len; |
4088 | } | |
4089 | ||
4090 | static struct md_sysfs_entry md_bitmap = | |
4091 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
4092 | ||
a35b0d69 | 4093 | static ssize_t |
fd01b88c | 4094 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 4095 | { |
58c0fed4 AN |
4096 | return sprintf(page, "%llu\n", |
4097 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
4098 | } |
4099 | ||
fd01b88c | 4100 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
4101 | |
4102 | static ssize_t | |
fd01b88c | 4103 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
4104 | { |
4105 | /* If array is inactive, we can reduce the component size, but | |
4106 | * not increase it (except from 0). | |
4107 | * If array is active, we can try an on-line resize | |
4108 | */ | |
b522adcd DW |
4109 | sector_t sectors; |
4110 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 4111 | |
58c0fed4 AN |
4112 | if (err < 0) |
4113 | return err; | |
6791875e N |
4114 | err = mddev_lock(mddev); |
4115 | if (err) | |
4116 | return err; | |
a35b0d69 | 4117 | if (mddev->pers) { |
58c0fed4 | 4118 | err = update_size(mddev, sectors); |
850b2b42 | 4119 | md_update_sb(mddev, 1); |
a35b0d69 | 4120 | } else { |
58c0fed4 AN |
4121 | if (mddev->dev_sectors == 0 || |
4122 | mddev->dev_sectors > sectors) | |
4123 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
4124 | else |
4125 | err = -ENOSPC; | |
4126 | } | |
6791875e | 4127 | mddev_unlock(mddev); |
a35b0d69 N |
4128 | return err ? err : len; |
4129 | } | |
4130 | ||
4131 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 4132 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 4133 | |
83f0d77a | 4134 | /* Metadata version. |
e691063a N |
4135 | * This is one of |
4136 | * 'none' for arrays with no metadata (good luck...) | |
4137 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
4138 | * or N.M for internally known formats |
4139 | */ | |
4140 | static ssize_t | |
fd01b88c | 4141 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
4142 | { |
4143 | if (mddev->persistent) | |
4144 | return sprintf(page, "%d.%d\n", | |
4145 | mddev->major_version, mddev->minor_version); | |
e691063a N |
4146 | else if (mddev->external) |
4147 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
4148 | else |
4149 | return sprintf(page, "none\n"); | |
4150 | } | |
4151 | ||
4152 | static ssize_t | |
fd01b88c | 4153 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
4154 | { |
4155 | int major, minor; | |
4156 | char *e; | |
6791875e | 4157 | int err; |
ea43ddd8 N |
4158 | /* Changing the details of 'external' metadata is |
4159 | * always permitted. Otherwise there must be | |
4160 | * no devices attached to the array. | |
4161 | */ | |
6791875e N |
4162 | |
4163 | err = mddev_lock(mddev); | |
4164 | if (err) | |
4165 | return err; | |
4166 | err = -EBUSY; | |
ea43ddd8 N |
4167 | if (mddev->external && strncmp(buf, "external:", 9) == 0) |
4168 | ; | |
4169 | else if (!list_empty(&mddev->disks)) | |
6791875e | 4170 | goto out_unlock; |
8bb93aac | 4171 | |
6791875e | 4172 | err = 0; |
8bb93aac N |
4173 | if (cmd_match(buf, "none")) { |
4174 | mddev->persistent = 0; | |
e691063a N |
4175 | mddev->external = 0; |
4176 | mddev->major_version = 0; | |
4177 | mddev->minor_version = 90; | |
6791875e | 4178 | goto out_unlock; |
e691063a N |
4179 | } |
4180 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4181 | size_t namelen = len-9; |
e691063a N |
4182 | if (namelen >= sizeof(mddev->metadata_type)) |
4183 | namelen = sizeof(mddev->metadata_type)-1; | |
4184 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4185 | mddev->metadata_type[namelen] = 0; | |
4186 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4187 | mddev->metadata_type[--namelen] = 0; | |
4188 | mddev->persistent = 0; | |
4189 | mddev->external = 1; | |
8bb93aac N |
4190 | mddev->major_version = 0; |
4191 | mddev->minor_version = 90; | |
6791875e | 4192 | goto out_unlock; |
8bb93aac N |
4193 | } |
4194 | major = simple_strtoul(buf, &e, 10); | |
6791875e | 4195 | err = -EINVAL; |
8bb93aac | 4196 | if (e==buf || *e != '.') |
6791875e | 4197 | goto out_unlock; |
8bb93aac N |
4198 | buf = e+1; |
4199 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4200 | if (e==buf || (*e && *e != '\n') ) |
6791875e N |
4201 | goto out_unlock; |
4202 | err = -ENOENT; | |
50511da3 | 4203 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
6791875e | 4204 | goto out_unlock; |
8bb93aac N |
4205 | mddev->major_version = major; |
4206 | mddev->minor_version = minor; | |
4207 | mddev->persistent = 1; | |
e691063a | 4208 | mddev->external = 0; |
6791875e N |
4209 | err = 0; |
4210 | out_unlock: | |
4211 | mddev_unlock(mddev); | |
4212 | return err ?: len; | |
8bb93aac N |
4213 | } |
4214 | ||
4215 | static struct md_sysfs_entry md_metadata = | |
750f199e | 4216 | __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4217 | |
24dd469d | 4218 | static ssize_t |
fd01b88c | 4219 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4220 | { |
7eec314d | 4221 | char *type = "idle"; |
b7b17c9b N |
4222 | unsigned long recovery = mddev->recovery; |
4223 | if (test_bit(MD_RECOVERY_FROZEN, &recovery)) | |
b6a9ce68 | 4224 | type = "frozen"; |
b7b17c9b N |
4225 | else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || |
4226 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { | |
4227 | if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) | |
ccfcc3c1 | 4228 | type = "reshape"; |
b7b17c9b N |
4229 | else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { |
4230 | if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) | |
24dd469d | 4231 | type = "resync"; |
b7b17c9b | 4232 | else if (test_bit(MD_RECOVERY_CHECK, &recovery)) |
24dd469d N |
4233 | type = "check"; |
4234 | else | |
4235 | type = "repair"; | |
b7b17c9b | 4236 | } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) |
24dd469d | 4237 | type = "recover"; |
985ca973 N |
4238 | else if (mddev->reshape_position != MaxSector) |
4239 | type = "reshape"; | |
24dd469d N |
4240 | } |
4241 | return sprintf(page, "%s\n", type); | |
4242 | } | |
4243 | ||
4244 | static ssize_t | |
fd01b88c | 4245 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4246 | { |
7eec314d N |
4247 | if (!mddev->pers || !mddev->pers->sync_request) |
4248 | return -EINVAL; | |
4249 | ||
b6a9ce68 N |
4250 | |
4251 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
56ccc112 N |
4252 | if (cmd_match(page, "frozen")) |
4253 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4254 | else | |
4255 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
8e8e2518 N |
4256 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4257 | mddev_lock(mddev) == 0) { | |
4258 | flush_workqueue(md_misc_wq); | |
4259 | if (mddev->sync_thread) { | |
4260 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6791875e | 4261 | md_reap_sync_thread(mddev); |
6791875e | 4262 | } |
8e8e2518 | 4263 | mddev_unlock(mddev); |
7eec314d | 4264 | } |
03c902e1 N |
4265 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4266 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4267 | return -EBUSY; |
72a23c21 | 4268 | else if (cmd_match(page, "resync")) |
56ccc112 | 4269 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
72a23c21 | 4270 | else if (cmd_match(page, "recover")) { |
56ccc112 | 4271 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
72a23c21 | 4272 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
72a23c21 | 4273 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4274 | int err; |
4275 | if (mddev->pers->start_reshape == NULL) | |
4276 | return -EINVAL; | |
6791875e N |
4277 | err = mddev_lock(mddev); |
4278 | if (!err) { | |
56ccc112 | 4279 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6791875e N |
4280 | err = mddev->pers->start_reshape(mddev); |
4281 | mddev_unlock(mddev); | |
4282 | } | |
16484bf5 N |
4283 | if (err) |
4284 | return err; | |
a99ac971 | 4285 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4286 | } else { |
bce74dac | 4287 | if (cmd_match(page, "check")) |
7eec314d | 4288 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4289 | else if (!cmd_match(page, "repair")) |
7eec314d | 4290 | return -EINVAL; |
56ccc112 | 4291 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
7eec314d N |
4292 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
4293 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4294 | } |
48c26ddc N |
4295 | if (mddev->ro == 2) { |
4296 | /* A write to sync_action is enough to justify | |
4297 | * canceling read-auto mode | |
4298 | */ | |
4299 | mddev->ro = 0; | |
4300 | md_wakeup_thread(mddev->sync_thread); | |
4301 | } | |
03c902e1 | 4302 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4303 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4304 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4305 | return len; |
4306 | } | |
4307 | ||
c4a39551 | 4308 | static struct md_sysfs_entry md_scan_mode = |
750f199e | 4309 | __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
c4a39551 JB |
4310 | |
4311 | static ssize_t | |
4312 | last_sync_action_show(struct mddev *mddev, char *page) | |
4313 | { | |
4314 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4315 | } | |
4316 | ||
4317 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4318 | ||
9d88883e | 4319 | static ssize_t |
fd01b88c | 4320 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4321 | { |
4322 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4323 | (unsigned long long) |
4324 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4325 | } |
4326 | ||
80ca3a44 | 4327 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4328 | |
88202a0c | 4329 | static ssize_t |
fd01b88c | 4330 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4331 | { |
4332 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4333 | mddev->sync_speed_min ? "local": "system"); | |
4334 | } | |
4335 | ||
4336 | static ssize_t | |
fd01b88c | 4337 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c | 4338 | { |
4c9309c0 AD |
4339 | unsigned int min; |
4340 | int rv; | |
4341 | ||
88202a0c | 4342 | if (strncmp(buf, "system", 6)==0) { |
4c9309c0 AD |
4343 | min = 0; |
4344 | } else { | |
4345 | rv = kstrtouint(buf, 10, &min); | |
4346 | if (rv < 0) | |
4347 | return rv; | |
4348 | if (min == 0) | |
4349 | return -EINVAL; | |
88202a0c | 4350 | } |
88202a0c N |
4351 | mddev->sync_speed_min = min; |
4352 | return len; | |
4353 | } | |
4354 | ||
4355 | static struct md_sysfs_entry md_sync_min = | |
4356 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4357 | ||
4358 | static ssize_t | |
fd01b88c | 4359 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4360 | { |
4361 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4362 | mddev->sync_speed_max ? "local": "system"); | |
4363 | } | |
4364 | ||
4365 | static ssize_t | |
fd01b88c | 4366 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c | 4367 | { |
4c9309c0 AD |
4368 | unsigned int max; |
4369 | int rv; | |
4370 | ||
88202a0c | 4371 | if (strncmp(buf, "system", 6)==0) { |
4c9309c0 AD |
4372 | max = 0; |
4373 | } else { | |
4374 | rv = kstrtouint(buf, 10, &max); | |
4375 | if (rv < 0) | |
4376 | return rv; | |
4377 | if (max == 0) | |
4378 | return -EINVAL; | |
88202a0c | 4379 | } |
88202a0c N |
4380 | mddev->sync_speed_max = max; |
4381 | return len; | |
4382 | } | |
4383 | ||
4384 | static struct md_sysfs_entry md_sync_max = | |
4385 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4386 | ||
d7f3d291 | 4387 | static ssize_t |
fd01b88c | 4388 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4389 | { |
4390 | return sprintf(page, "%d\n", mddev->degraded); | |
4391 | } | |
4392 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4393 | |
90b08710 | 4394 | static ssize_t |
fd01b88c | 4395 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4396 | { |
4397 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4398 | } | |
4399 | ||
4400 | static ssize_t | |
fd01b88c | 4401 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4402 | { |
4403 | long n; | |
4404 | ||
b29bebd6 | 4405 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4406 | return -EINVAL; |
4407 | ||
4408 | if (n != 0 && n != 1) | |
4409 | return -EINVAL; | |
4410 | ||
4411 | mddev->parallel_resync = n; | |
4412 | ||
4413 | if (mddev->sync_thread) | |
4414 | wake_up(&resync_wait); | |
4415 | ||
4416 | return len; | |
4417 | } | |
4418 | ||
4419 | /* force parallel resync, even with shared block devices */ | |
4420 | static struct md_sysfs_entry md_sync_force_parallel = | |
4421 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4422 | sync_force_parallel_show, sync_force_parallel_store); | |
4423 | ||
88202a0c | 4424 | static ssize_t |
fd01b88c | 4425 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4426 | { |
4427 | unsigned long resync, dt, db; | |
d1a7c503 N |
4428 | if (mddev->curr_resync == 0) |
4429 | return sprintf(page, "none\n"); | |
9687a60c AN |
4430 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4431 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4432 | if (!dt) dt++; |
9687a60c AN |
4433 | db = resync - mddev->resync_mark_cnt; |
4434 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4435 | } |
4436 | ||
80ca3a44 | 4437 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4438 | |
4439 | static ssize_t | |
fd01b88c | 4440 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4441 | { |
13ae864b | 4442 | unsigned long long max_sectors, resync; |
88202a0c | 4443 | |
acb180b0 N |
4444 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4445 | return sprintf(page, "none\n"); | |
4446 | ||
72f36d59 N |
4447 | if (mddev->curr_resync == 1 || |
4448 | mddev->curr_resync == 2) | |
4449 | return sprintf(page, "delayed\n"); | |
4450 | ||
c804cdec N |
4451 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4452 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4453 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4454 | else |
58c0fed4 | 4455 | max_sectors = mddev->dev_sectors; |
88202a0c | 4456 | |
acb180b0 | 4457 | resync = mddev->curr_resync_completed; |
13ae864b | 4458 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4459 | } |
4460 | ||
750f199e N |
4461 | static struct md_sysfs_entry md_sync_completed = |
4462 | __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); | |
88202a0c | 4463 | |
5e96ee65 | 4464 | static ssize_t |
fd01b88c | 4465 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4466 | { |
4467 | return sprintf(page, "%llu\n", | |
4468 | (unsigned long long)mddev->resync_min); | |
4469 | } | |
4470 | static ssize_t | |
fd01b88c | 4471 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4472 | { |
4473 | unsigned long long min; | |
23da422b | 4474 | int err; |
23da422b | 4475 | |
b29bebd6 | 4476 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 | 4477 | return -EINVAL; |
23da422b N |
4478 | |
4479 | spin_lock(&mddev->lock); | |
4480 | err = -EINVAL; | |
5e96ee65 | 4481 | if (min > mddev->resync_max) |
23da422b N |
4482 | goto out_unlock; |
4483 | ||
4484 | err = -EBUSY; | |
5e96ee65 | 4485 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4486 | goto out_unlock; |
5e96ee65 | 4487 | |
50c37b13 N |
4488 | /* Round down to multiple of 4K for safety */ |
4489 | mddev->resync_min = round_down(min, 8); | |
23da422b | 4490 | err = 0; |
5e96ee65 | 4491 | |
23da422b N |
4492 | out_unlock: |
4493 | spin_unlock(&mddev->lock); | |
4494 | return err ?: len; | |
5e96ee65 NB |
4495 | } |
4496 | ||
4497 | static struct md_sysfs_entry md_min_sync = | |
4498 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4499 | ||
c6207277 | 4500 | static ssize_t |
fd01b88c | 4501 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4502 | { |
4503 | if (mddev->resync_max == MaxSector) | |
4504 | return sprintf(page, "max\n"); | |
4505 | else | |
4506 | return sprintf(page, "%llu\n", | |
4507 | (unsigned long long)mddev->resync_max); | |
4508 | } | |
4509 | static ssize_t | |
fd01b88c | 4510 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 | 4511 | { |
23da422b N |
4512 | int err; |
4513 | spin_lock(&mddev->lock); | |
c6207277 N |
4514 | if (strncmp(buf, "max", 3) == 0) |
4515 | mddev->resync_max = MaxSector; | |
4516 | else { | |
5e96ee65 | 4517 | unsigned long long max; |
23da422b N |
4518 | int chunk; |
4519 | ||
4520 | err = -EINVAL; | |
b29bebd6 | 4521 | if (kstrtoull(buf, 10, &max)) |
23da422b | 4522 | goto out_unlock; |
5e96ee65 | 4523 | if (max < mddev->resync_min) |
23da422b N |
4524 | goto out_unlock; |
4525 | ||
4526 | err = -EBUSY; | |
c6207277 | 4527 | if (max < mddev->resync_max && |
4d484a4a | 4528 | mddev->ro == 0 && |
c6207277 | 4529 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4530 | goto out_unlock; |
c6207277 N |
4531 | |
4532 | /* Must be a multiple of chunk_size */ | |
23da422b N |
4533 | chunk = mddev->chunk_sectors; |
4534 | if (chunk) { | |
2ac06c33 | 4535 | sector_t temp = max; |
23da422b N |
4536 | |
4537 | err = -EINVAL; | |
4538 | if (sector_div(temp, chunk)) | |
4539 | goto out_unlock; | |
c6207277 N |
4540 | } |
4541 | mddev->resync_max = max; | |
4542 | } | |
4543 | wake_up(&mddev->recovery_wait); | |
23da422b N |
4544 | err = 0; |
4545 | out_unlock: | |
4546 | spin_unlock(&mddev->lock); | |
4547 | return err ?: len; | |
c6207277 N |
4548 | } |
4549 | ||
4550 | static struct md_sysfs_entry md_max_sync = | |
4551 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4552 | ||
e464eafd | 4553 | static ssize_t |
fd01b88c | 4554 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4555 | { |
4556 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4557 | } | |
4558 | ||
4559 | static ssize_t | |
fd01b88c | 4560 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd | 4561 | { |
4c9309c0 | 4562 | unsigned long long old, new; |
6791875e | 4563 | int err; |
e464eafd | 4564 | |
4c9309c0 AD |
4565 | err = kstrtoull(buf, 10, &new); |
4566 | if (err < 0) | |
4567 | return err; | |
4568 | if (new != (sector_t)new) | |
e464eafd | 4569 | return -EINVAL; |
23ddff37 | 4570 | |
6791875e N |
4571 | err = mddev_lock(mddev); |
4572 | if (err) | |
4573 | return err; | |
4574 | err = -EINVAL; | |
4575 | if (mddev->pers == NULL || | |
4576 | mddev->pers->quiesce == NULL) | |
4577 | goto unlock; | |
4578 | old = mddev->suspend_lo; | |
23ddff37 N |
4579 | mddev->suspend_lo = new; |
4580 | if (new >= old) | |
4581 | /* Shrinking suspended region */ | |
e464eafd | 4582 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4583 | else { |
4584 | /* Expanding suspended region - need to wait */ | |
4585 | mddev->pers->quiesce(mddev, 1); | |
4586 | mddev->pers->quiesce(mddev, 0); | |
4587 | } | |
6791875e N |
4588 | err = 0; |
4589 | unlock: | |
4590 | mddev_unlock(mddev); | |
4591 | return err ?: len; | |
e464eafd N |
4592 | } |
4593 | static struct md_sysfs_entry md_suspend_lo = | |
4594 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4595 | ||
e464eafd | 4596 | static ssize_t |
fd01b88c | 4597 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4598 | { |
4599 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4600 | } | |
4601 | ||
4602 | static ssize_t | |
fd01b88c | 4603 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd | 4604 | { |
4c9309c0 | 4605 | unsigned long long old, new; |
6791875e | 4606 | int err; |
e464eafd | 4607 | |
4c9309c0 AD |
4608 | err = kstrtoull(buf, 10, &new); |
4609 | if (err < 0) | |
4610 | return err; | |
4611 | if (new != (sector_t)new) | |
e464eafd | 4612 | return -EINVAL; |
23ddff37 | 4613 | |
6791875e N |
4614 | err = mddev_lock(mddev); |
4615 | if (err) | |
4616 | return err; | |
4617 | err = -EINVAL; | |
4618 | if (mddev->pers == NULL || | |
4619 | mddev->pers->quiesce == NULL) | |
4620 | goto unlock; | |
4621 | old = mddev->suspend_hi; | |
23ddff37 N |
4622 | mddev->suspend_hi = new; |
4623 | if (new <= old) | |
4624 | /* Shrinking suspended region */ | |
4625 | mddev->pers->quiesce(mddev, 2); | |
4626 | else { | |
4627 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4628 | mddev->pers->quiesce(mddev, 1); |
4629 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 | 4630 | } |
6791875e N |
4631 | err = 0; |
4632 | unlock: | |
4633 | mddev_unlock(mddev); | |
4634 | return err ?: len; | |
e464eafd N |
4635 | } |
4636 | static struct md_sysfs_entry md_suspend_hi = | |
4637 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4638 | ||
08a02ecd | 4639 | static ssize_t |
fd01b88c | 4640 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4641 | { |
4642 | if (mddev->reshape_position != MaxSector) | |
4643 | return sprintf(page, "%llu\n", | |
4644 | (unsigned long long)mddev->reshape_position); | |
4645 | strcpy(page, "none\n"); | |
4646 | return 5; | |
4647 | } | |
4648 | ||
4649 | static ssize_t | |
fd01b88c | 4650 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4651 | { |
c6563a8c | 4652 | struct md_rdev *rdev; |
4c9309c0 | 4653 | unsigned long long new; |
6791875e | 4654 | int err; |
6791875e | 4655 | |
4c9309c0 AD |
4656 | err = kstrtoull(buf, 10, &new); |
4657 | if (err < 0) | |
4658 | return err; | |
4659 | if (new != (sector_t)new) | |
08a02ecd | 4660 | return -EINVAL; |
6791875e N |
4661 | err = mddev_lock(mddev); |
4662 | if (err) | |
4663 | return err; | |
4664 | err = -EBUSY; | |
4665 | if (mddev->pers) | |
4666 | goto unlock; | |
08a02ecd N |
4667 | mddev->reshape_position = new; |
4668 | mddev->delta_disks = 0; | |
2c810cdd | 4669 | mddev->reshape_backwards = 0; |
08a02ecd N |
4670 | mddev->new_level = mddev->level; |
4671 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4672 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4673 | rdev_for_each(rdev, mddev) |
4674 | rdev->new_data_offset = rdev->data_offset; | |
6791875e N |
4675 | err = 0; |
4676 | unlock: | |
4677 | mddev_unlock(mddev); | |
4678 | return err ?: len; | |
08a02ecd N |
4679 | } |
4680 | ||
4681 | static struct md_sysfs_entry md_reshape_position = | |
4682 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4683 | reshape_position_store); | |
4684 | ||
2c810cdd N |
4685 | static ssize_t |
4686 | reshape_direction_show(struct mddev *mddev, char *page) | |
4687 | { | |
4688 | return sprintf(page, "%s\n", | |
4689 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4690 | } | |
4691 | ||
4692 | static ssize_t | |
4693 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4694 | { | |
4695 | int backwards = 0; | |
6791875e N |
4696 | int err; |
4697 | ||
2c810cdd N |
4698 | if (cmd_match(buf, "forwards")) |
4699 | backwards = 0; | |
4700 | else if (cmd_match(buf, "backwards")) | |
4701 | backwards = 1; | |
4702 | else | |
4703 | return -EINVAL; | |
4704 | if (mddev->reshape_backwards == backwards) | |
4705 | return len; | |
4706 | ||
6791875e N |
4707 | err = mddev_lock(mddev); |
4708 | if (err) | |
4709 | return err; | |
2c810cdd N |
4710 | /* check if we are allowed to change */ |
4711 | if (mddev->delta_disks) | |
6791875e N |
4712 | err = -EBUSY; |
4713 | else if (mddev->persistent && | |
2c810cdd | 4714 | mddev->major_version == 0) |
6791875e N |
4715 | err = -EINVAL; |
4716 | else | |
4717 | mddev->reshape_backwards = backwards; | |
4718 | mddev_unlock(mddev); | |
4719 | return err ?: len; | |
2c810cdd N |
4720 | } |
4721 | ||
4722 | static struct md_sysfs_entry md_reshape_direction = | |
4723 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4724 | reshape_direction_store); | |
4725 | ||
b522adcd | 4726 | static ssize_t |
fd01b88c | 4727 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4728 | { |
4729 | if (mddev->external_size) | |
4730 | return sprintf(page, "%llu\n", | |
4731 | (unsigned long long)mddev->array_sectors/2); | |
4732 | else | |
4733 | return sprintf(page, "default\n"); | |
4734 | } | |
4735 | ||
4736 | static ssize_t | |
fd01b88c | 4737 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4738 | { |
4739 | sector_t sectors; | |
6791875e N |
4740 | int err; |
4741 | ||
4742 | err = mddev_lock(mddev); | |
4743 | if (err) | |
4744 | return err; | |
b522adcd DW |
4745 | |
4746 | if (strncmp(buf, "default", 7) == 0) { | |
4747 | if (mddev->pers) | |
4748 | sectors = mddev->pers->size(mddev, 0, 0); | |
4749 | else | |
4750 | sectors = mddev->array_sectors; | |
4751 | ||
4752 | mddev->external_size = 0; | |
4753 | } else { | |
4754 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
6791875e N |
4755 | err = -EINVAL; |
4756 | else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
4757 | err = -E2BIG; | |
4758 | else | |
4759 | mddev->external_size = 1; | |
b522adcd DW |
4760 | } |
4761 | ||
6791875e N |
4762 | if (!err) { |
4763 | mddev->array_sectors = sectors; | |
4764 | if (mddev->pers) { | |
4765 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
4766 | revalidate_disk(mddev->gendisk); | |
4767 | } | |
cbe6ef1d | 4768 | } |
6791875e N |
4769 | mddev_unlock(mddev); |
4770 | return err ?: len; | |
b522adcd DW |
4771 | } |
4772 | ||
4773 | static struct md_sysfs_entry md_array_size = | |
4774 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4775 | array_size_store); | |
e464eafd | 4776 | |
eae1701f N |
4777 | static struct attribute *md_default_attrs[] = { |
4778 | &md_level.attr, | |
d4dbd025 | 4779 | &md_layout.attr, |
eae1701f | 4780 | &md_raid_disks.attr, |
3b34380a | 4781 | &md_chunk_size.attr, |
a35b0d69 | 4782 | &md_size.attr, |
a94213b1 | 4783 | &md_resync_start.attr, |
8bb93aac | 4784 | &md_metadata.attr, |
6d7ff738 | 4785 | &md_new_device.attr, |
16f17b39 | 4786 | &md_safe_delay.attr, |
9e653b63 | 4787 | &md_array_state.attr, |
08a02ecd | 4788 | &md_reshape_position.attr, |
2c810cdd | 4789 | &md_reshape_direction.attr, |
b522adcd | 4790 | &md_array_size.attr, |
1e50915f | 4791 | &max_corr_read_errors.attr, |
411036fa N |
4792 | NULL, |
4793 | }; | |
4794 | ||
4795 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4796 | &md_scan_mode.attr, |
c4a39551 | 4797 | &md_last_scan_mode.attr, |
9d88883e | 4798 | &md_mismatches.attr, |
88202a0c N |
4799 | &md_sync_min.attr, |
4800 | &md_sync_max.attr, | |
4801 | &md_sync_speed.attr, | |
90b08710 | 4802 | &md_sync_force_parallel.attr, |
88202a0c | 4803 | &md_sync_completed.attr, |
5e96ee65 | 4804 | &md_min_sync.attr, |
c6207277 | 4805 | &md_max_sync.attr, |
e464eafd N |
4806 | &md_suspend_lo.attr, |
4807 | &md_suspend_hi.attr, | |
9b1d1dac | 4808 | &md_bitmap.attr, |
d7f3d291 | 4809 | &md_degraded.attr, |
eae1701f N |
4810 | NULL, |
4811 | }; | |
411036fa N |
4812 | static struct attribute_group md_redundancy_group = { |
4813 | .name = NULL, | |
4814 | .attrs = md_redundancy_attrs, | |
4815 | }; | |
4816 | ||
eae1701f N |
4817 | static ssize_t |
4818 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4819 | { | |
4820 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4821 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4822 | ssize_t rv; |
eae1701f N |
4823 | |
4824 | if (!entry->show) | |
4825 | return -EIO; | |
af8a2434 N |
4826 | spin_lock(&all_mddevs_lock); |
4827 | if (list_empty(&mddev->all_mddevs)) { | |
4828 | spin_unlock(&all_mddevs_lock); | |
4829 | return -EBUSY; | |
4830 | } | |
4831 | mddev_get(mddev); | |
4832 | spin_unlock(&all_mddevs_lock); | |
4833 | ||
b7b17c9b | 4834 | rv = entry->show(mddev, page); |
af8a2434 | 4835 | mddev_put(mddev); |
96de1e66 | 4836 | return rv; |
eae1701f N |
4837 | } |
4838 | ||
4839 | static ssize_t | |
4840 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4841 | const char *page, size_t length) | |
4842 | { | |
4843 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4844 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4845 | ssize_t rv; |
eae1701f N |
4846 | |
4847 | if (!entry->store) | |
4848 | return -EIO; | |
67463acb N |
4849 | if (!capable(CAP_SYS_ADMIN)) |
4850 | return -EACCES; | |
af8a2434 N |
4851 | spin_lock(&all_mddevs_lock); |
4852 | if (list_empty(&mddev->all_mddevs)) { | |
4853 | spin_unlock(&all_mddevs_lock); | |
4854 | return -EBUSY; | |
4855 | } | |
4856 | mddev_get(mddev); | |
4857 | spin_unlock(&all_mddevs_lock); | |
6791875e | 4858 | rv = entry->store(mddev, page, length); |
af8a2434 | 4859 | mddev_put(mddev); |
96de1e66 | 4860 | return rv; |
eae1701f N |
4861 | } |
4862 | ||
4863 | static void md_free(struct kobject *ko) | |
4864 | { | |
fd01b88c | 4865 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4866 | |
4867 | if (mddev->sysfs_state) | |
4868 | sysfs_put(mddev->sysfs_state); | |
4869 | ||
6cd18e71 N |
4870 | if (mddev->queue) |
4871 | blk_cleanup_queue(mddev->queue); | |
a21d1504 N |
4872 | if (mddev->gendisk) { |
4873 | del_gendisk(mddev->gendisk); | |
4874 | put_disk(mddev->gendisk); | |
4875 | } | |
a21d1504 | 4876 | |
eae1701f N |
4877 | kfree(mddev); |
4878 | } | |
4879 | ||
52cf25d0 | 4880 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4881 | .show = md_attr_show, |
4882 | .store = md_attr_store, | |
4883 | }; | |
4884 | static struct kobj_type md_ktype = { | |
4885 | .release = md_free, | |
4886 | .sysfs_ops = &md_sysfs_ops, | |
4887 | .default_attrs = md_default_attrs, | |
4888 | }; | |
4889 | ||
1da177e4 LT |
4890 | int mdp_major = 0; |
4891 | ||
5fd3a17e DW |
4892 | static void mddev_delayed_delete(struct work_struct *ws) |
4893 | { | |
fd01b88c | 4894 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4895 | |
43a70507 | 4896 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4897 | kobject_del(&mddev->kobj); |
4898 | kobject_put(&mddev->kobj); | |
4899 | } | |
4900 | ||
efeb53c0 | 4901 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4902 | { |
48c9c27b | 4903 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4904 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4905 | struct gendisk *disk; |
efeb53c0 N |
4906 | int partitioned; |
4907 | int shift; | |
4908 | int unit; | |
3830c62f | 4909 | int error; |
1da177e4 LT |
4910 | |
4911 | if (!mddev) | |
efeb53c0 N |
4912 | return -ENODEV; |
4913 | ||
4914 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4915 | shift = partitioned ? MdpMinorShift : 0; | |
4916 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4917 | |
e804ac78 TH |
4918 | /* wait for any previous instance of this device to be |
4919 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4920 | */ |
e804ac78 | 4921 | flush_workqueue(md_misc_wq); |
d3374825 | 4922 | |
48c9c27b | 4923 | mutex_lock(&disks_mutex); |
0909dc44 N |
4924 | error = -EEXIST; |
4925 | if (mddev->gendisk) | |
4926 | goto abort; | |
efeb53c0 N |
4927 | |
4928 | if (name) { | |
4929 | /* Need to ensure that 'name' is not a duplicate. | |
4930 | */ | |
fd01b88c | 4931 | struct mddev *mddev2; |
efeb53c0 N |
4932 | spin_lock(&all_mddevs_lock); |
4933 | ||
4934 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4935 | if (mddev2->gendisk && | |
4936 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4937 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4938 | goto abort; |
efeb53c0 N |
4939 | } |
4940 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4941 | } |
8b765398 | 4942 | |
0909dc44 | 4943 | error = -ENOMEM; |
8b765398 | 4944 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4945 | if (!mddev->queue) |
4946 | goto abort; | |
409c57f3 N |
4947 | mddev->queue->queuedata = mddev; |
4948 | ||
409c57f3 | 4949 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 4950 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 4951 | |
1da177e4 LT |
4952 | disk = alloc_disk(1 << shift); |
4953 | if (!disk) { | |
8b765398 N |
4954 | blk_cleanup_queue(mddev->queue); |
4955 | mddev->queue = NULL; | |
0909dc44 | 4956 | goto abort; |
1da177e4 | 4957 | } |
efeb53c0 | 4958 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4959 | disk->first_minor = unit << shift; |
efeb53c0 N |
4960 | if (name) |
4961 | strcpy(disk->disk_name, name); | |
4962 | else if (partitioned) | |
1da177e4 | 4963 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4964 | else |
1da177e4 | 4965 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4966 | disk->fops = &md_fops; |
4967 | disk->private_data = mddev; | |
4968 | disk->queue = mddev->queue; | |
b0140891 | 4969 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4970 | /* Allow extended partitions. This makes the |
d3374825 | 4971 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4972 | * remove it now. |
4973 | */ | |
4974 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4975 | mddev->gendisk = disk; |
b0140891 N |
4976 | /* As soon as we call add_disk(), another thread could get |
4977 | * through to md_open, so make sure it doesn't get too far | |
4978 | */ | |
4979 | mutex_lock(&mddev->open_mutex); | |
4980 | add_disk(disk); | |
4981 | ||
ed9e1982 TH |
4982 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4983 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4984 | if (error) { |
4985 | /* This isn't possible, but as kobject_init_and_add is marked | |
4986 | * __must_check, we must do something with the result | |
4987 | */ | |
5e55e2f5 N |
4988 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4989 | disk->disk_name); | |
0909dc44 N |
4990 | error = 0; |
4991 | } | |
00bcb4ac N |
4992 | if (mddev->kobj.sd && |
4993 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4994 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4995 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4996 | abort: |
4997 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4998 | if (!error && mddev->kobj.sd) { |
3830c62f | 4999 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 5000 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 5001 | } |
d3374825 | 5002 | mddev_put(mddev); |
0909dc44 | 5003 | return error; |
efeb53c0 N |
5004 | } |
5005 | ||
5006 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
5007 | { | |
5008 | md_alloc(dev, NULL); | |
1da177e4 LT |
5009 | return NULL; |
5010 | } | |
5011 | ||
efeb53c0 N |
5012 | static int add_named_array(const char *val, struct kernel_param *kp) |
5013 | { | |
5014 | /* val must be "md_*" where * is not all digits. | |
5015 | * We allocate an array with a large free minor number, and | |
5016 | * set the name to val. val must not already be an active name. | |
5017 | */ | |
5018 | int len = strlen(val); | |
5019 | char buf[DISK_NAME_LEN]; | |
5020 | ||
5021 | while (len && val[len-1] == '\n') | |
5022 | len--; | |
5023 | if (len >= DISK_NAME_LEN) | |
5024 | return -E2BIG; | |
5025 | strlcpy(buf, val, len+1); | |
5026 | if (strncmp(buf, "md_", 3) != 0) | |
5027 | return -EINVAL; | |
5028 | return md_alloc(0, buf); | |
5029 | } | |
5030 | ||
1da177e4 LT |
5031 | static void md_safemode_timeout(unsigned long data) |
5032 | { | |
fd01b88c | 5033 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 5034 | |
0fd62b86 NB |
5035 | if (!atomic_read(&mddev->writes_pending)) { |
5036 | mddev->safemode = 1; | |
5037 | if (mddev->external) | |
00bcb4ac | 5038 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 5039 | } |
1da177e4 LT |
5040 | md_wakeup_thread(mddev->thread); |
5041 | } | |
5042 | ||
6ff8d8ec | 5043 | static int start_dirty_degraded; |
1da177e4 | 5044 | |
fd01b88c | 5045 | int md_run(struct mddev *mddev) |
1da177e4 | 5046 | { |
2604b703 | 5047 | int err; |
3cb03002 | 5048 | struct md_rdev *rdev; |
84fc4b56 | 5049 | struct md_personality *pers; |
1da177e4 | 5050 | |
a757e64c N |
5051 | if (list_empty(&mddev->disks)) |
5052 | /* cannot run an array with no devices.. */ | |
1da177e4 | 5053 | return -EINVAL; |
1da177e4 LT |
5054 | |
5055 | if (mddev->pers) | |
5056 | return -EBUSY; | |
bb4f1e9d N |
5057 | /* Cannot run until previous stop completes properly */ |
5058 | if (mddev->sysfs_active) | |
5059 | return -EBUSY; | |
b6eb127d | 5060 | |
1da177e4 LT |
5061 | /* |
5062 | * Analyze all RAID superblock(s) | |
5063 | */ | |
1ec4a939 N |
5064 | if (!mddev->raid_disks) { |
5065 | if (!mddev->persistent) | |
5066 | return -EINVAL; | |
a757e64c | 5067 | analyze_sbs(mddev); |
1ec4a939 | 5068 | } |
1da177e4 | 5069 | |
d9d166c2 N |
5070 | if (mddev->level != LEVEL_NONE) |
5071 | request_module("md-level-%d", mddev->level); | |
5072 | else if (mddev->clevel[0]) | |
5073 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
5074 | |
5075 | /* | |
5076 | * Drop all container device buffers, from now on | |
5077 | * the only valid external interface is through the md | |
5078 | * device. | |
1da177e4 | 5079 | */ |
dafb20fa | 5080 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 5081 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5082 | continue; |
5083 | sync_blockdev(rdev->bdev); | |
f98393a6 | 5084 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
5085 | |
5086 | /* perform some consistency tests on the device. | |
5087 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 5088 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 5089 | */ |
a6ff7e08 JB |
5090 | if (rdev->meta_bdev) { |
5091 | /* Nothing to check */; | |
5092 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
5093 | if (mddev->dev_sectors && |
5094 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 5095 | > rdev->sb_start) { |
f0d76d70 N |
5096 | printk("md: %s: data overlaps metadata\n", |
5097 | mdname(mddev)); | |
5098 | return -EINVAL; | |
5099 | } | |
5100 | } else { | |
0f420358 | 5101 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
5102 | > rdev->data_offset) { |
5103 | printk("md: %s: metadata overlaps data\n", | |
5104 | mdname(mddev)); | |
5105 | return -EINVAL; | |
5106 | } | |
5107 | } | |
00bcb4ac | 5108 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
5109 | } |
5110 | ||
a167f663 | 5111 | if (mddev->bio_set == NULL) |
395c72a7 | 5112 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 5113 | |
1da177e4 | 5114 | spin_lock(&pers_lock); |
d9d166c2 | 5115 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 5116 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 5117 | spin_unlock(&pers_lock); |
d9d166c2 N |
5118 | if (mddev->level != LEVEL_NONE) |
5119 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
5120 | mddev->level); | |
5121 | else | |
5122 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
5123 | mddev->clevel); | |
1da177e4 LT |
5124 | return -EINVAL; |
5125 | } | |
1da177e4 | 5126 | spin_unlock(&pers_lock); |
34817e8c N |
5127 | if (mddev->level != pers->level) { |
5128 | mddev->level = pers->level; | |
5129 | mddev->new_level = pers->level; | |
5130 | } | |
d9d166c2 | 5131 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 5132 | |
f6705578 | 5133 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 5134 | pers->start_reshape == NULL) { |
f6705578 | 5135 | /* This personality cannot handle reshaping... */ |
f6705578 N |
5136 | module_put(pers->owner); |
5137 | return -EINVAL; | |
5138 | } | |
5139 | ||
7dd5e7c3 N |
5140 | if (pers->sync_request) { |
5141 | /* Warn if this is a potentially silly | |
5142 | * configuration. | |
5143 | */ | |
5144 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5145 | struct md_rdev *rdev2; |
7dd5e7c3 | 5146 | int warned = 0; |
159ec1fc | 5147 | |
dafb20fa N |
5148 | rdev_for_each(rdev, mddev) |
5149 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
5150 | if (rdev < rdev2 && |
5151 | rdev->bdev->bd_contains == | |
5152 | rdev2->bdev->bd_contains) { | |
5153 | printk(KERN_WARNING | |
5154 | "%s: WARNING: %s appears to be" | |
5155 | " on the same physical disk as" | |
5156 | " %s.\n", | |
5157 | mdname(mddev), | |
5158 | bdevname(rdev->bdev,b), | |
5159 | bdevname(rdev2->bdev,b2)); | |
5160 | warned = 1; | |
5161 | } | |
5162 | } | |
159ec1fc | 5163 | |
7dd5e7c3 N |
5164 | if (warned) |
5165 | printk(KERN_WARNING | |
5166 | "True protection against single-disk" | |
5167 | " failure might be compromised.\n"); | |
5168 | } | |
5169 | ||
657390d2 | 5170 | mddev->recovery = 0; |
58c0fed4 AN |
5171 | /* may be over-ridden by personality */ |
5172 | mddev->resync_max_sectors = mddev->dev_sectors; | |
5173 | ||
6ff8d8ec | 5174 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 5175 | |
0f9552b5 | 5176 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
5177 | mddev->ro = 2; /* read-only, but switch on first write */ |
5178 | ||
36d091f4 | 5179 | err = pers->run(mddev); |
13e53df3 AN |
5180 | if (err) |
5181 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
36d091f4 | 5182 | else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { |
b522adcd DW |
5183 | WARN_ONCE(!mddev->external_size, "%s: default size too small," |
5184 | " but 'external_size' not in effect?\n", __func__); | |
5185 | printk(KERN_ERR | |
5186 | "md: invalid array_size %llu > default size %llu\n", | |
5187 | (unsigned long long)mddev->array_sectors / 2, | |
36d091f4 | 5188 | (unsigned long long)pers->size(mddev, 0, 0) / 2); |
b522adcd | 5189 | err = -EINVAL; |
b522adcd | 5190 | } |
36d091f4 | 5191 | if (err == 0 && pers->sync_request && |
ef99bf48 | 5192 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { |
f9209a32 GR |
5193 | struct bitmap *bitmap; |
5194 | ||
5195 | bitmap = bitmap_create(mddev, -1); | |
5196 | if (IS_ERR(bitmap)) { | |
5197 | err = PTR_ERR(bitmap); | |
b15c2e57 N |
5198 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", |
5199 | mdname(mddev), err); | |
f9209a32 GR |
5200 | } else |
5201 | mddev->bitmap = bitmap; | |
5202 | ||
b15c2e57 | 5203 | } |
1da177e4 | 5204 | if (err) { |
5aa61f42 | 5205 | mddev_detach(mddev); |
0c35bd47 N |
5206 | if (mddev->private) |
5207 | pers->free(mddev, mddev->private); | |
bd691922 | 5208 | mddev->private = NULL; |
36d091f4 | 5209 | module_put(pers->owner); |
32a7627c N |
5210 | bitmap_destroy(mddev); |
5211 | return err; | |
1da177e4 | 5212 | } |
5c675f83 N |
5213 | if (mddev->queue) { |
5214 | mddev->queue->backing_dev_info.congested_data = mddev; | |
5215 | mddev->queue->backing_dev_info.congested_fn = md_congested; | |
5216 | } | |
36d091f4 | 5217 | if (pers->sync_request) { |
00bcb4ac N |
5218 | if (mddev->kobj.sd && |
5219 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
5220 | printk(KERN_WARNING |
5221 | "md: cannot register extra attributes for %s\n", | |
5222 | mdname(mddev)); | |
00bcb4ac | 5223 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 5224 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
5225 | mddev->ro = 0; |
5226 | ||
f72ffdd6 | 5227 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
5228 | atomic_set(&mddev->max_corr_read_errors, |
5229 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 | 5230 | mddev->safemode = 0; |
28c1b9fd GR |
5231 | if (mddev_is_clustered(mddev)) |
5232 | mddev->safemode_delay = 0; | |
5233 | else | |
5234 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ | |
1da177e4 | 5235 | mddev->in_sync = 1; |
0ca69886 | 5236 | smp_wmb(); |
36d091f4 N |
5237 | spin_lock(&mddev->lock); |
5238 | mddev->pers = pers; | |
0ca69886 | 5239 | mddev->ready = 1; |
36d091f4 | 5240 | spin_unlock(&mddev->lock); |
dafb20fa | 5241 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5242 | if (rdev->raid_disk >= 0) |
5243 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 5244 | /* failure here is OK */; |
f72ffdd6 | 5245 | |
a4a3d26d N |
5246 | if (mddev->degraded && !mddev->ro) |
5247 | /* This ensures that recovering status is reported immediately | |
5248 | * via sysfs - until a lack of spares is confirmed. | |
5249 | */ | |
5250 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
1da177e4 | 5251 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 5252 | |
7a0a5355 | 5253 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 5254 | md_update_sb(mddev, 0); |
1da177e4 | 5255 | |
d7603b7e | 5256 | md_new_event(mddev); |
00bcb4ac N |
5257 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
5258 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 5259 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
5260 | return 0; |
5261 | } | |
390ee602 | 5262 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 5263 | |
fd01b88c | 5264 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
5265 | { |
5266 | int err; | |
5267 | ||
5268 | err = md_run(mddev); | |
5269 | if (err) | |
5270 | goto out; | |
69e51b44 N |
5271 | err = bitmap_load(mddev); |
5272 | if (err) { | |
5273 | bitmap_destroy(mddev); | |
5274 | goto out; | |
5275 | } | |
0fd018af | 5276 | |
28c1b9fd GR |
5277 | if (mddev_is_clustered(mddev)) |
5278 | md_allow_write(mddev); | |
5279 | ||
0fd018af JB |
5280 | md_wakeup_thread(mddev->thread); |
5281 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5282 | ||
fe60b014 N |
5283 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5284 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5285 | mddev->changed = 1; |
fe60b014 N |
5286 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5287 | out: | |
5288 | return err; | |
5289 | } | |
5290 | ||
fd01b88c | 5291 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5292 | { |
5293 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5294 | |
80fab1d7 | 5295 | /* Complain if it has no devices */ |
1da177e4 | 5296 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5297 | return -ENXIO; |
5298 | if (!mddev->pers) | |
5299 | return -EINVAL; | |
5300 | if (!mddev->ro) | |
5301 | return -EBUSY; | |
5302 | mddev->safemode = 0; | |
5303 | mddev->ro = 0; | |
5304 | set_disk_ro(disk, 0); | |
5305 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5306 | mdname(mddev)); | |
5307 | /* Kick recovery or resync if necessary */ | |
5308 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5309 | md_wakeup_thread(mddev->thread); | |
5310 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5311 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5312 | return 0; |
1da177e4 LT |
5313 | } |
5314 | ||
fd01b88c | 5315 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5316 | { |
5317 | mddev->array_sectors = 0; | |
5318 | mddev->external_size = 0; | |
5319 | mddev->dev_sectors = 0; | |
5320 | mddev->raid_disks = 0; | |
5321 | mddev->recovery_cp = 0; | |
5322 | mddev->resync_min = 0; | |
5323 | mddev->resync_max = MaxSector; | |
5324 | mddev->reshape_position = MaxSector; | |
5325 | mddev->external = 0; | |
5326 | mddev->persistent = 0; | |
5327 | mddev->level = LEVEL_NONE; | |
5328 | mddev->clevel[0] = 0; | |
5329 | mddev->flags = 0; | |
5330 | mddev->ro = 0; | |
5331 | mddev->metadata_type[0] = 0; | |
5332 | mddev->chunk_sectors = 0; | |
5333 | mddev->ctime = mddev->utime = 0; | |
5334 | mddev->layout = 0; | |
5335 | mddev->max_disks = 0; | |
5336 | mddev->events = 0; | |
a8707c08 | 5337 | mddev->can_decrease_events = 0; |
6177b472 | 5338 | mddev->delta_disks = 0; |
2c810cdd | 5339 | mddev->reshape_backwards = 0; |
6177b472 N |
5340 | mddev->new_level = LEVEL_NONE; |
5341 | mddev->new_layout = 0; | |
5342 | mddev->new_chunk_sectors = 0; | |
5343 | mddev->curr_resync = 0; | |
7f7583d4 | 5344 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5345 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5346 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5347 | mddev->recovery = 0; | |
5348 | mddev->in_sync = 0; | |
f0b4f7e2 | 5349 | mddev->changed = 0; |
6177b472 | 5350 | mddev->degraded = 0; |
6177b472 | 5351 | mddev->safemode = 0; |
bd691922 | 5352 | mddev->private = NULL; |
6177b472 N |
5353 | mddev->bitmap_info.offset = 0; |
5354 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5355 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5356 | mddev->bitmap_info.chunksize = 0; |
5357 | mddev->bitmap_info.daemon_sleep = 0; | |
5358 | mddev->bitmap_info.max_write_behind = 0; | |
5359 | } | |
5360 | ||
fd01b88c | 5361 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5362 | { |
6b6204ee | 5363 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5364 | flush_workqueue(md_misc_wq); |
a047e125 | 5365 | if (mddev->sync_thread) { |
a047e125 | 5366 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5367 | md_reap_sync_thread(mddev); |
a047e125 N |
5368 | } |
5369 | ||
5370 | del_timer_sync(&mddev->safemode_timer); | |
5371 | ||
5372 | bitmap_flush(mddev); | |
5373 | md_super_wait(mddev); | |
5374 | ||
b6d428c6 | 5375 | if (mddev->ro == 0 && |
28c1b9fd GR |
5376 | ((!mddev->in_sync && !mddev_is_clustered(mddev)) || |
5377 | (mddev->flags & MD_UPDATE_SB_FLAGS))) { | |
a047e125 | 5378 | /* mark array as shutdown cleanly */ |
28c1b9fd GR |
5379 | if (!mddev_is_clustered(mddev)) |
5380 | mddev->in_sync = 1; | |
a047e125 N |
5381 | md_update_sb(mddev, 1); |
5382 | } | |
5383 | } | |
defad61a | 5384 | |
fd01b88c | 5385 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5386 | { |
29f097c4 | 5387 | mddev_lock_nointr(mddev); |
defad61a N |
5388 | __md_stop_writes(mddev); |
5389 | mddev_unlock(mddev); | |
5390 | } | |
390ee602 | 5391 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5392 | |
5aa61f42 N |
5393 | static void mddev_detach(struct mddev *mddev) |
5394 | { | |
5395 | struct bitmap *bitmap = mddev->bitmap; | |
5396 | /* wait for behind writes to complete */ | |
5397 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
5398 | printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n", | |
5399 | mdname(mddev)); | |
5400 | /* need to kick something here to make sure I/O goes? */ | |
5401 | wait_event(bitmap->behind_wait, | |
5402 | atomic_read(&bitmap->behind_writes) == 0); | |
5403 | } | |
36d091f4 | 5404 | if (mddev->pers && mddev->pers->quiesce) { |
5aa61f42 N |
5405 | mddev->pers->quiesce(mddev, 1); |
5406 | mddev->pers->quiesce(mddev, 0); | |
5407 | } | |
5408 | md_unregister_thread(&mddev->thread); | |
5409 | if (mddev->queue) | |
5410 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
5411 | } | |
5412 | ||
5eff3c43 | 5413 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5414 | { |
36d091f4 | 5415 | struct md_personality *pers = mddev->pers; |
5aa61f42 | 5416 | mddev_detach(mddev); |
ee5d004f N |
5417 | /* Ensure ->event_work is done */ |
5418 | flush_workqueue(md_misc_wq); | |
36d091f4 N |
5419 | spin_lock(&mddev->lock); |
5420 | mddev->ready = 0; | |
6177b472 | 5421 | mddev->pers = NULL; |
36d091f4 N |
5422 | spin_unlock(&mddev->lock); |
5423 | pers->free(mddev, mddev->private); | |
bd691922 | 5424 | mddev->private = NULL; |
36d091f4 N |
5425 | if (pers->sync_request && mddev->to_remove == NULL) |
5426 | mddev->to_remove = &md_redundancy_group; | |
5427 | module_put(pers->owner); | |
cca9cf90 | 5428 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5429 | } |
5eff3c43 N |
5430 | |
5431 | void md_stop(struct mddev *mddev) | |
5432 | { | |
5433 | /* stop the array and free an attached data structures. | |
5434 | * This is called from dm-raid | |
5435 | */ | |
5436 | __md_stop(mddev); | |
5437 | bitmap_destroy(mddev); | |
5438 | if (mddev->bio_set) | |
5439 | bioset_free(mddev->bio_set); | |
5440 | } | |
5441 | ||
390ee602 | 5442 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5443 | |
a05b7ea0 | 5444 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5445 | { |
5446 | int err = 0; | |
30b8feb7 N |
5447 | int did_freeze = 0; |
5448 | ||
5449 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5450 | did_freeze = 1; | |
5451 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5452 | md_wakeup_thread(mddev->thread); | |
5453 | } | |
f851b60d | 5454 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5455 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5456 | if (mddev->sync_thread) |
30b8feb7 N |
5457 | /* Thread might be blocked waiting for metadata update |
5458 | * which will now never happen */ | |
5459 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5460 | |
88724bfa N |
5461 | if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
5462 | return -EBUSY; | |
30b8feb7 | 5463 | mddev_unlock(mddev); |
f851b60d N |
5464 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5465 | &mddev->recovery)); | |
88724bfa N |
5466 | wait_event(mddev->sb_wait, |
5467 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
30b8feb7 N |
5468 | mddev_lock_nointr(mddev); |
5469 | ||
a4bd82d0 | 5470 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5471 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5472 | mddev->sync_thread || |
f851b60d | 5473 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5474 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
a4bd82d0 | 5475 | printk("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5476 | if (did_freeze) { |
5477 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5478 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5479 | md_wakeup_thread(mddev->thread); |
5480 | } | |
a4bd82d0 N |
5481 | err = -EBUSY; |
5482 | goto out; | |
5483 | } | |
5484 | if (mddev->pers) { | |
defad61a | 5485 | __md_stop_writes(mddev); |
a4bd82d0 N |
5486 | |
5487 | err = -ENXIO; | |
5488 | if (mddev->ro==1) | |
5489 | goto out; | |
5490 | mddev->ro = 1; | |
5491 | set_disk_ro(mddev->gendisk, 1); | |
5492 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5493 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5494 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5495 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5496 | err = 0; |
a4bd82d0 N |
5497 | } |
5498 | out: | |
5499 | mutex_unlock(&mddev->open_mutex); | |
5500 | return err; | |
5501 | } | |
5502 | ||
9e653b63 N |
5503 | /* mode: |
5504 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5505 | * 2 - stop but do not disassemble array |
5506 | */ | |
f72ffdd6 | 5507 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5508 | struct block_device *bdev) |
1da177e4 | 5509 | { |
1da177e4 | 5510 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5511 | struct md_rdev *rdev; |
30b8feb7 N |
5512 | int did_freeze = 0; |
5513 | ||
5514 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5515 | did_freeze = 1; | |
5516 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5517 | md_wakeup_thread(mddev->thread); | |
5518 | } | |
f851b60d | 5519 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5520 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5521 | if (mddev->sync_thread) |
30b8feb7 N |
5522 | /* Thread might be blocked waiting for metadata update |
5523 | * which will now never happen */ | |
5524 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5525 | |
30b8feb7 | 5526 | mddev_unlock(mddev); |
f851b60d N |
5527 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5528 | !test_bit(MD_RECOVERY_RUNNING, | |
5529 | &mddev->recovery))); | |
30b8feb7 | 5530 | mddev_lock_nointr(mddev); |
1da177e4 | 5531 | |
c8c00a69 | 5532 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5533 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5534 | mddev->sysfs_active || |
5535 | mddev->sync_thread || | |
f851b60d | 5536 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5537 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
df5b20cf | 5538 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5539 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5540 | if (did_freeze) { |
5541 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5542 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5543 | md_wakeup_thread(mddev->thread); |
5544 | } | |
260fa034 N |
5545 | return -EBUSY; |
5546 | } | |
6e17b027 | 5547 | if (mddev->pers) { |
a4bd82d0 N |
5548 | if (mddev->ro) |
5549 | set_disk_ro(disk, 0); | |
409c57f3 | 5550 | |
defad61a | 5551 | __md_stop_writes(mddev); |
5eff3c43 | 5552 | __md_stop(mddev); |
a4bd82d0 | 5553 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5554 | |
a4bd82d0 | 5555 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5556 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5557 | |
dafb20fa | 5558 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5559 | if (rdev->raid_disk >= 0) |
5560 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5561 | |
a4bd82d0 | 5562 | set_capacity(disk, 0); |
6e17b027 | 5563 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5564 | mddev->changed = 1; |
a4bd82d0 | 5565 | revalidate_disk(disk); |
0d4ca600 | 5566 | |
a4bd82d0 N |
5567 | if (mddev->ro) |
5568 | mddev->ro = 0; | |
6e17b027 N |
5569 | } else |
5570 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5571 | /* |
5572 | * Free resources if final stop | |
5573 | */ | |
9e653b63 | 5574 | if (mode == 0) { |
1da177e4 LT |
5575 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5576 | ||
978f946b | 5577 | bitmap_destroy(mddev); |
c3d9714e | 5578 | if (mddev->bitmap_info.file) { |
4af1a041 N |
5579 | struct file *f = mddev->bitmap_info.file; |
5580 | spin_lock(&mddev->lock); | |
c3d9714e | 5581 | mddev->bitmap_info.file = NULL; |
4af1a041 N |
5582 | spin_unlock(&mddev->lock); |
5583 | fput(f); | |
978f946b | 5584 | } |
c3d9714e | 5585 | mddev->bitmap_info.offset = 0; |
978f946b | 5586 | |
1da177e4 LT |
5587 | export_array(mddev); |
5588 | ||
6177b472 | 5589 | md_clean(mddev); |
934d9c23 | 5590 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5591 | if (mddev->hold_active == UNTIL_STOP) |
5592 | mddev->hold_active = 0; | |
a4bd82d0 | 5593 | } |
3f9d99c1 | 5594 | blk_integrity_unregister(disk); |
d7603b7e | 5595 | md_new_event(mddev); |
00bcb4ac | 5596 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5597 | return 0; |
1da177e4 LT |
5598 | } |
5599 | ||
fdee8ae4 | 5600 | #ifndef MODULE |
fd01b88c | 5601 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5602 | { |
3cb03002 | 5603 | struct md_rdev *rdev; |
1da177e4 LT |
5604 | int err; |
5605 | ||
a757e64c | 5606 | if (list_empty(&mddev->disks)) |
1da177e4 | 5607 | return; |
1da177e4 LT |
5608 | |
5609 | printk(KERN_INFO "md: running: "); | |
5610 | ||
dafb20fa | 5611 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5612 | char b[BDEVNAME_SIZE]; |
5613 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5614 | } | |
5615 | printk("\n"); | |
5616 | ||
d710e138 | 5617 | err = do_md_run(mddev); |
1da177e4 LT |
5618 | if (err) { |
5619 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5620 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5621 | } |
5622 | } | |
5623 | ||
5624 | /* | |
5625 | * lets try to run arrays based on all disks that have arrived | |
5626 | * until now. (those are in pending_raid_disks) | |
5627 | * | |
5628 | * the method: pick the first pending disk, collect all disks with | |
5629 | * the same UUID, remove all from the pending list and put them into | |
5630 | * the 'same_array' list. Then order this list based on superblock | |
5631 | * update time (freshest comes first), kick out 'old' disks and | |
5632 | * compare superblocks. If everything's fine then run it. | |
5633 | * | |
5634 | * If "unit" is allocated, then bump its reference count | |
5635 | */ | |
5636 | static void autorun_devices(int part) | |
5637 | { | |
3cb03002 | 5638 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5639 | struct mddev *mddev; |
1da177e4 LT |
5640 | char b[BDEVNAME_SIZE]; |
5641 | ||
5642 | printk(KERN_INFO "md: autorun ...\n"); | |
5643 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5644 | int unit; |
1da177e4 | 5645 | dev_t dev; |
ad01c9e3 | 5646 | LIST_HEAD(candidates); |
1da177e4 | 5647 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5648 | struct md_rdev, same_set); |
1da177e4 LT |
5649 | |
5650 | printk(KERN_INFO "md: considering %s ...\n", | |
5651 | bdevname(rdev0->bdev,b)); | |
5652 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5653 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5654 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5655 | printk(KERN_INFO "md: adding %s ...\n", | |
5656 | bdevname(rdev->bdev,b)); | |
5657 | list_move(&rdev->same_set, &candidates); | |
5658 | } | |
5659 | /* | |
5660 | * now we have a set of devices, with all of them having | |
5661 | * mostly sane superblocks. It's time to allocate the | |
5662 | * mddev. | |
5663 | */ | |
e8703fe1 N |
5664 | if (part) { |
5665 | dev = MKDEV(mdp_major, | |
5666 | rdev0->preferred_minor << MdpMinorShift); | |
5667 | unit = MINOR(dev) >> MdpMinorShift; | |
5668 | } else { | |
5669 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5670 | unit = MINOR(dev); | |
5671 | } | |
5672 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5673 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5674 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5675 | break; | |
5676 | } | |
1da177e4 LT |
5677 | |
5678 | md_probe(dev, NULL, NULL); | |
5679 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5680 | if (!mddev || !mddev->gendisk) { |
5681 | if (mddev) | |
5682 | mddev_put(mddev); | |
5683 | printk(KERN_ERR | |
1da177e4 LT |
5684 | "md: cannot allocate memory for md drive.\n"); |
5685 | break; | |
5686 | } | |
f72ffdd6 | 5687 | if (mddev_lock(mddev)) |
1da177e4 LT |
5688 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
5689 | mdname(mddev)); | |
5690 | else if (mddev->raid_disks || mddev->major_version | |
5691 | || !list_empty(&mddev->disks)) { | |
f72ffdd6 | 5692 | printk(KERN_WARNING |
1da177e4 LT |
5693 | "md: %s already running, cannot run %s\n", |
5694 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5695 | mddev_unlock(mddev); | |
5696 | } else { | |
5697 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5698 | mddev->persistent = 1; |
159ec1fc | 5699 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5700 | list_del_init(&rdev->same_set); |
5701 | if (bind_rdev_to_array(rdev, mddev)) | |
5702 | export_rdev(rdev); | |
5703 | } | |
5704 | autorun_array(mddev); | |
5705 | mddev_unlock(mddev); | |
5706 | } | |
5707 | /* on success, candidates will be empty, on error | |
5708 | * it won't... | |
5709 | */ | |
159ec1fc | 5710 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5711 | list_del_init(&rdev->same_set); |
1da177e4 | 5712 | export_rdev(rdev); |
4b80991c | 5713 | } |
1da177e4 LT |
5714 | mddev_put(mddev); |
5715 | } | |
5716 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5717 | } | |
fdee8ae4 | 5718 | #endif /* !MODULE */ |
1da177e4 | 5719 | |
f72ffdd6 | 5720 | static int get_version(void __user *arg) |
1da177e4 LT |
5721 | { |
5722 | mdu_version_t ver; | |
5723 | ||
5724 | ver.major = MD_MAJOR_VERSION; | |
5725 | ver.minor = MD_MINOR_VERSION; | |
5726 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5727 | ||
5728 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5729 | return -EFAULT; | |
5730 | ||
5731 | return 0; | |
5732 | } | |
5733 | ||
f72ffdd6 | 5734 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
5735 | { |
5736 | mdu_array_info_t info; | |
a9f326eb | 5737 | int nr,working,insync,failed,spare; |
3cb03002 | 5738 | struct md_rdev *rdev; |
1da177e4 | 5739 | |
1ca69c4b N |
5740 | nr = working = insync = failed = spare = 0; |
5741 | rcu_read_lock(); | |
5742 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5743 | nr++; |
b2d444d7 | 5744 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5745 | failed++; |
5746 | else { | |
5747 | working++; | |
b2d444d7 | 5748 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 5749 | insync++; |
1da177e4 LT |
5750 | else |
5751 | spare++; | |
5752 | } | |
5753 | } | |
1ca69c4b | 5754 | rcu_read_unlock(); |
1da177e4 LT |
5755 | |
5756 | info.major_version = mddev->major_version; | |
5757 | info.minor_version = mddev->minor_version; | |
5758 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5759 | info.ctime = mddev->ctime; | |
5760 | info.level = mddev->level; | |
58c0fed4 AN |
5761 | info.size = mddev->dev_sectors / 2; |
5762 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5763 | info.size = -1; |
1da177e4 LT |
5764 | info.nr_disks = nr; |
5765 | info.raid_disks = mddev->raid_disks; | |
5766 | info.md_minor = mddev->md_minor; | |
5767 | info.not_persistent= !mddev->persistent; | |
5768 | ||
5769 | info.utime = mddev->utime; | |
5770 | info.state = 0; | |
5771 | if (mddev->in_sync) | |
5772 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5773 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 5774 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
ca8895d9 GR |
5775 | if (mddev_is_clustered(mddev)) |
5776 | info.state |= (1<<MD_SB_CLUSTERED); | |
a9f326eb | 5777 | info.active_disks = insync; |
1da177e4 LT |
5778 | info.working_disks = working; |
5779 | info.failed_disks = failed; | |
5780 | info.spare_disks = spare; | |
5781 | ||
5782 | info.layout = mddev->layout; | |
9d8f0363 | 5783 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5784 | |
5785 | if (copy_to_user(arg, &info, sizeof(info))) | |
5786 | return -EFAULT; | |
5787 | ||
5788 | return 0; | |
5789 | } | |
5790 | ||
f72ffdd6 | 5791 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
5792 | { |
5793 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
f4ad3d38 | 5794 | char *ptr; |
4af1a041 | 5795 | int err; |
32a7627c | 5796 | |
b6878d9e | 5797 | file = kzalloc(sizeof(*file), GFP_NOIO); |
32a7627c | 5798 | if (!file) |
4af1a041 | 5799 | return -ENOMEM; |
32a7627c | 5800 | |
4af1a041 N |
5801 | err = 0; |
5802 | spin_lock(&mddev->lock); | |
25eafe1a BR |
5803 | /* bitmap enabled */ |
5804 | if (mddev->bitmap_info.file) { | |
5805 | ptr = file_path(mddev->bitmap_info.file, file->pathname, | |
5806 | sizeof(file->pathname)); | |
5807 | if (IS_ERR(ptr)) | |
5808 | err = PTR_ERR(ptr); | |
5809 | else | |
5810 | memmove(file->pathname, ptr, | |
5811 | sizeof(file->pathname)-(ptr-file->pathname)); | |
5812 | } | |
4af1a041 | 5813 | spin_unlock(&mddev->lock); |
32a7627c | 5814 | |
4af1a041 N |
5815 | if (err == 0 && |
5816 | copy_to_user(arg, file, sizeof(*file))) | |
32a7627c | 5817 | err = -EFAULT; |
4af1a041 | 5818 | |
32a7627c N |
5819 | kfree(file); |
5820 | return err; | |
5821 | } | |
5822 | ||
f72ffdd6 | 5823 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
5824 | { |
5825 | mdu_disk_info_t info; | |
3cb03002 | 5826 | struct md_rdev *rdev; |
1da177e4 LT |
5827 | |
5828 | if (copy_from_user(&info, arg, sizeof(info))) | |
5829 | return -EFAULT; | |
5830 | ||
1ca69c4b | 5831 | rcu_read_lock(); |
57d051dc | 5832 | rdev = md_find_rdev_nr_rcu(mddev, info.number); |
1da177e4 LT |
5833 | if (rdev) { |
5834 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5835 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5836 | info.raid_disk = rdev->raid_disk; | |
5837 | info.state = 0; | |
b2d444d7 | 5838 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5839 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5840 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5841 | info.state |= (1<<MD_DISK_ACTIVE); |
5842 | info.state |= (1<<MD_DISK_SYNC); | |
5843 | } | |
8ddf9efe N |
5844 | if (test_bit(WriteMostly, &rdev->flags)) |
5845 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5846 | } else { |
5847 | info.major = info.minor = 0; | |
5848 | info.raid_disk = -1; | |
5849 | info.state = (1<<MD_DISK_REMOVED); | |
5850 | } | |
1ca69c4b | 5851 | rcu_read_unlock(); |
1da177e4 LT |
5852 | |
5853 | if (copy_to_user(arg, &info, sizeof(info))) | |
5854 | return -EFAULT; | |
5855 | ||
5856 | return 0; | |
5857 | } | |
5858 | ||
f72ffdd6 | 5859 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5860 | { |
5861 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5862 | struct md_rdev *rdev; |
1da177e4 LT |
5863 | dev_t dev = MKDEV(info->major,info->minor); |
5864 | ||
1aee41f6 GR |
5865 | if (mddev_is_clustered(mddev) && |
5866 | !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { | |
fa8259da | 5867 | pr_err("%s: Cannot add to clustered mddev.\n", |
1aee41f6 GR |
5868 | mdname(mddev)); |
5869 | return -EINVAL; | |
5870 | } | |
5871 | ||
1da177e4 LT |
5872 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) |
5873 | return -EOVERFLOW; | |
5874 | ||
5875 | if (!mddev->raid_disks) { | |
5876 | int err; | |
5877 | /* expecting a device which has a superblock */ | |
5878 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5879 | if (IS_ERR(rdev)) { | |
f72ffdd6 | 5880 | printk(KERN_WARNING |
1da177e4 LT |
5881 | "md: md_import_device returned %ld\n", |
5882 | PTR_ERR(rdev)); | |
5883 | return PTR_ERR(rdev); | |
5884 | } | |
5885 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5886 | struct md_rdev *rdev0 |
5887 | = list_entry(mddev->disks.next, | |
5888 | struct md_rdev, same_set); | |
a9f326eb | 5889 | err = super_types[mddev->major_version] |
1da177e4 LT |
5890 | .load_super(rdev, rdev0, mddev->minor_version); |
5891 | if (err < 0) { | |
f72ffdd6 | 5892 | printk(KERN_WARNING |
1da177e4 | 5893 | "md: %s has different UUID to %s\n", |
f72ffdd6 | 5894 | bdevname(rdev->bdev,b), |
1da177e4 LT |
5895 | bdevname(rdev0->bdev,b2)); |
5896 | export_rdev(rdev); | |
5897 | return -EINVAL; | |
5898 | } | |
5899 | } | |
5900 | err = bind_rdev_to_array(rdev, mddev); | |
5901 | if (err) | |
5902 | export_rdev(rdev); | |
5903 | return err; | |
5904 | } | |
5905 | ||
5906 | /* | |
5907 | * add_new_disk can be used once the array is assembled | |
5908 | * to add "hot spares". They must already have a superblock | |
5909 | * written | |
5910 | */ | |
5911 | if (mddev->pers) { | |
5912 | int err; | |
5913 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 5914 | printk(KERN_WARNING |
1da177e4 LT |
5915 | "%s: personality does not support diskops!\n", |
5916 | mdname(mddev)); | |
5917 | return -EINVAL; | |
5918 | } | |
7b1e35f6 N |
5919 | if (mddev->persistent) |
5920 | rdev = md_import_device(dev, mddev->major_version, | |
5921 | mddev->minor_version); | |
5922 | else | |
5923 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 5924 | if (IS_ERR(rdev)) { |
f72ffdd6 | 5925 | printk(KERN_WARNING |
1da177e4 LT |
5926 | "md: md_import_device returned %ld\n", |
5927 | PTR_ERR(rdev)); | |
5928 | return PTR_ERR(rdev); | |
5929 | } | |
1a855a06 | 5930 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5931 | if (!mddev->persistent) { |
5932 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5933 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5934 | rdev->raid_disk = info->raid_disk; |
bf572541 | 5935 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 5936 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 5937 | } else |
41158c7e | 5938 | rdev->raid_disk = -1; |
f466722c | 5939 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
5940 | } else |
5941 | super_types[mddev->major_version]. | |
5942 | validate_super(mddev, rdev); | |
bedd86b7 | 5943 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 5944 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
5945 | /* This was a hot-add request, but events doesn't |
5946 | * match, so reject it. | |
5947 | */ | |
5948 | export_rdev(rdev); | |
5949 | return -EINVAL; | |
5950 | } | |
5951 | ||
b2d444d7 | 5952 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5953 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5954 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5955 | else |
5956 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5957 | |
1aee41f6 GR |
5958 | /* |
5959 | * check whether the device shows up in other nodes | |
5960 | */ | |
5961 | if (mddev_is_clustered(mddev)) { | |
dbb64f86 | 5962 | if (info->state & (1 << MD_DISK_CANDIDATE)) |
1aee41f6 | 5963 | set_bit(Candidate, &rdev->flags); |
dbb64f86 | 5964 | else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { |
1aee41f6 | 5965 | /* --add initiated by this node */ |
dbb64f86 | 5966 | err = md_cluster_ops->add_new_disk(mddev, rdev); |
1aee41f6 | 5967 | if (err) { |
1aee41f6 GR |
5968 | export_rdev(rdev); |
5969 | return err; | |
5970 | } | |
5971 | } | |
5972 | } | |
5973 | ||
1da177e4 LT |
5974 | rdev->raid_disk = -1; |
5975 | err = bind_rdev_to_array(rdev, mddev); | |
dbb64f86 | 5976 | |
1da177e4 LT |
5977 | if (err) |
5978 | export_rdev(rdev); | |
dbb64f86 GR |
5979 | |
5980 | if (mddev_is_clustered(mddev)) { | |
5981 | if (info->state & (1 << MD_DISK_CANDIDATE)) | |
5982 | md_cluster_ops->new_disk_ack(mddev, (err == 0)); | |
5983 | else { | |
5984 | if (err) | |
5985 | md_cluster_ops->add_new_disk_cancel(mddev); | |
5986 | else | |
5987 | err = add_bound_rdev(rdev); | |
5988 | } | |
5989 | ||
5990 | } else if (!err) | |
a6da4ef8 | 5991 | err = add_bound_rdev(rdev); |
dbb64f86 | 5992 | |
1da177e4 LT |
5993 | return err; |
5994 | } | |
5995 | ||
5996 | /* otherwise, add_new_disk is only allowed | |
5997 | * for major_version==0 superblocks | |
5998 | */ | |
5999 | if (mddev->major_version != 0) { | |
6000 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
6001 | mdname(mddev)); | |
6002 | return -EINVAL; | |
6003 | } | |
6004 | ||
6005 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
6006 | int err; | |
d710e138 | 6007 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 6008 | if (IS_ERR(rdev)) { |
f72ffdd6 | 6009 | printk(KERN_WARNING |
1da177e4 LT |
6010 | "md: error, md_import_device() returned %ld\n", |
6011 | PTR_ERR(rdev)); | |
6012 | return PTR_ERR(rdev); | |
6013 | } | |
6014 | rdev->desc_nr = info->number; | |
6015 | if (info->raid_disk < mddev->raid_disks) | |
6016 | rdev->raid_disk = info->raid_disk; | |
6017 | else | |
6018 | rdev->raid_disk = -1; | |
6019 | ||
1da177e4 | 6020 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
6021 | if (info->state & (1<<MD_DISK_SYNC)) |
6022 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 6023 | |
8ddf9efe N |
6024 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
6025 | set_bit(WriteMostly, &rdev->flags); | |
6026 | ||
1da177e4 LT |
6027 | if (!mddev->persistent) { |
6028 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
6029 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
6030 | } else | |
57b2caa3 | 6031 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 6032 | rdev->sectors = rdev->sb_start; |
1da177e4 | 6033 | |
2bf071bf N |
6034 | err = bind_rdev_to_array(rdev, mddev); |
6035 | if (err) { | |
6036 | export_rdev(rdev); | |
6037 | return err; | |
6038 | } | |
1da177e4 LT |
6039 | } |
6040 | ||
6041 | return 0; | |
6042 | } | |
6043 | ||
f72ffdd6 | 6044 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
6045 | { |
6046 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 6047 | struct md_rdev *rdev; |
23b63f9f | 6048 | int ret = -1; |
1da177e4 | 6049 | |
1da177e4 LT |
6050 | rdev = find_rdev(mddev, dev); |
6051 | if (!rdev) | |
6052 | return -ENXIO; | |
6053 | ||
293467aa | 6054 | if (mddev_is_clustered(mddev)) |
23b63f9f | 6055 | ret = md_cluster_ops->metadata_update_start(mddev); |
293467aa | 6056 | |
2910ff17 GR |
6057 | if (rdev->raid_disk < 0) |
6058 | goto kick_rdev; | |
6059 | ||
3ea8929d N |
6060 | clear_bit(Blocked, &rdev->flags); |
6061 | remove_and_add_spares(mddev, rdev); | |
6062 | ||
1da177e4 LT |
6063 | if (rdev->raid_disk >= 0) |
6064 | goto busy; | |
6065 | ||
2910ff17 | 6066 | kick_rdev: |
23b63f9f | 6067 | if (mddev_is_clustered(mddev) && ret == 0) |
88bcfef7 GR |
6068 | md_cluster_ops->remove_disk(mddev, rdev); |
6069 | ||
fb56dfef | 6070 | md_kick_rdev_from_array(rdev); |
850b2b42 | 6071 | md_update_sb(mddev, 1); |
d7603b7e | 6072 | md_new_event(mddev); |
1da177e4 LT |
6073 | |
6074 | return 0; | |
6075 | busy: | |
23b63f9f | 6076 | if (mddev_is_clustered(mddev) && ret == 0) |
293467aa | 6077 | md_cluster_ops->metadata_update_cancel(mddev); |
2910ff17 | 6078 | |
fdefa4d8 | 6079 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
6080 | bdevname(rdev->bdev,b), mdname(mddev)); |
6081 | return -EBUSY; | |
6082 | } | |
6083 | ||
f72ffdd6 | 6084 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
6085 | { |
6086 | char b[BDEVNAME_SIZE]; | |
6087 | int err; | |
3cb03002 | 6088 | struct md_rdev *rdev; |
1da177e4 LT |
6089 | |
6090 | if (!mddev->pers) | |
6091 | return -ENODEV; | |
6092 | ||
6093 | if (mddev->major_version != 0) { | |
6094 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
6095 | " version-0 superblocks.\n", | |
6096 | mdname(mddev)); | |
6097 | return -EINVAL; | |
6098 | } | |
6099 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 6100 | printk(KERN_WARNING |
1da177e4 LT |
6101 | "%s: personality does not support diskops!\n", |
6102 | mdname(mddev)); | |
6103 | return -EINVAL; | |
6104 | } | |
6105 | ||
d710e138 | 6106 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 6107 | if (IS_ERR(rdev)) { |
f72ffdd6 | 6108 | printk(KERN_WARNING |
1da177e4 LT |
6109 | "md: error, md_import_device() returned %ld\n", |
6110 | PTR_ERR(rdev)); | |
6111 | return -EINVAL; | |
6112 | } | |
6113 | ||
6114 | if (mddev->persistent) | |
57b2caa3 | 6115 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 6116 | else |
77304d2a | 6117 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 6118 | |
8190e754 | 6119 | rdev->sectors = rdev->sb_start; |
1da177e4 | 6120 | |
b2d444d7 | 6121 | if (test_bit(Faulty, &rdev->flags)) { |
f72ffdd6 | 6122 | printk(KERN_WARNING |
1da177e4 LT |
6123 | "md: can not hot-add faulty %s disk to %s!\n", |
6124 | bdevname(rdev->bdev,b), mdname(mddev)); | |
6125 | err = -EINVAL; | |
6126 | goto abort_export; | |
6127 | } | |
293467aa | 6128 | |
b2d444d7 | 6129 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 6130 | rdev->desc_nr = -1; |
5842730d | 6131 | rdev->saved_raid_disk = -1; |
2bf071bf N |
6132 | err = bind_rdev_to_array(rdev, mddev); |
6133 | if (err) | |
2aa82191 | 6134 | goto abort_export; |
1da177e4 LT |
6135 | |
6136 | /* | |
6137 | * The rest should better be atomic, we can have disk failures | |
6138 | * noticed in interrupt contexts ... | |
6139 | */ | |
6140 | ||
1da177e4 LT |
6141 | rdev->raid_disk = -1; |
6142 | ||
850b2b42 | 6143 | md_update_sb(mddev, 1); |
1da177e4 LT |
6144 | /* |
6145 | * Kick recovery, maybe this spare has to be added to the | |
6146 | * array immediately. | |
6147 | */ | |
6148 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6149 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 6150 | md_new_event(mddev); |
1da177e4 LT |
6151 | return 0; |
6152 | ||
1da177e4 LT |
6153 | abort_export: |
6154 | export_rdev(rdev); | |
6155 | return err; | |
6156 | } | |
6157 | ||
fd01b88c | 6158 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 6159 | { |
035328c2 | 6160 | int err = 0; |
32a7627c | 6161 | |
36fa3063 | 6162 | if (mddev->pers) { |
d66b1b39 | 6163 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
6164 | return -EBUSY; |
6165 | if (mddev->recovery || mddev->sync_thread) | |
6166 | return -EBUSY; | |
6167 | /* we should be able to change the bitmap.. */ | |
6168 | } | |
32a7627c | 6169 | |
36fa3063 | 6170 | if (fd >= 0) { |
035328c2 | 6171 | struct inode *inode; |
1e594bb2 N |
6172 | struct file *f; |
6173 | ||
6174 | if (mddev->bitmap || mddev->bitmap_info.file) | |
36fa3063 | 6175 | return -EEXIST; /* cannot add when bitmap is present */ |
1e594bb2 | 6176 | f = fget(fd); |
32a7627c | 6177 | |
1e594bb2 | 6178 | if (f == NULL) { |
36fa3063 N |
6179 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
6180 | mdname(mddev)); | |
6181 | return -EBADF; | |
6182 | } | |
6183 | ||
1e594bb2 | 6184 | inode = f->f_mapping->host; |
035328c2 N |
6185 | if (!S_ISREG(inode->i_mode)) { |
6186 | printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", | |
6187 | mdname(mddev)); | |
6188 | err = -EBADF; | |
1e594bb2 | 6189 | } else if (!(f->f_mode & FMODE_WRITE)) { |
035328c2 N |
6190 | printk(KERN_ERR "%s: error: bitmap file must open for write\n", |
6191 | mdname(mddev)); | |
6192 | err = -EBADF; | |
6193 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
36fa3063 N |
6194 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
6195 | mdname(mddev)); | |
035328c2 N |
6196 | err = -EBUSY; |
6197 | } | |
6198 | if (err) { | |
1e594bb2 | 6199 | fput(f); |
36fa3063 N |
6200 | return err; |
6201 | } | |
1e594bb2 | 6202 | mddev->bitmap_info.file = f; |
c3d9714e | 6203 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
6204 | } else if (mddev->bitmap == NULL) |
6205 | return -ENOENT; /* cannot remove what isn't there */ | |
6206 | err = 0; | |
6207 | if (mddev->pers) { | |
6208 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 6209 | if (fd >= 0) { |
f9209a32 GR |
6210 | struct bitmap *bitmap; |
6211 | ||
6212 | bitmap = bitmap_create(mddev, -1); | |
6213 | if (!IS_ERR(bitmap)) { | |
6214 | mddev->bitmap = bitmap; | |
69e51b44 | 6215 | err = bitmap_load(mddev); |
ba599aca N |
6216 | } else |
6217 | err = PTR_ERR(bitmap); | |
69e51b44 | 6218 | } |
d7375ab3 | 6219 | if (fd < 0 || err) { |
36fa3063 | 6220 | bitmap_destroy(mddev); |
d7375ab3 N |
6221 | fd = -1; /* make sure to put the file */ |
6222 | } | |
36fa3063 | 6223 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
6224 | } |
6225 | if (fd < 0) { | |
4af1a041 N |
6226 | struct file *f = mddev->bitmap_info.file; |
6227 | if (f) { | |
6228 | spin_lock(&mddev->lock); | |
6229 | mddev->bitmap_info.file = NULL; | |
6230 | spin_unlock(&mddev->lock); | |
6231 | fput(f); | |
6232 | } | |
36fa3063 N |
6233 | } |
6234 | ||
32a7627c N |
6235 | return err; |
6236 | } | |
6237 | ||
1da177e4 LT |
6238 | /* |
6239 | * set_array_info is used two different ways | |
6240 | * The original usage is when creating a new array. | |
6241 | * In this usage, raid_disks is > 0 and it together with | |
6242 | * level, size, not_persistent,layout,chunksize determine the | |
6243 | * shape of the array. | |
6244 | * This will always create an array with a type-0.90.0 superblock. | |
6245 | * The newer usage is when assembling an array. | |
6246 | * In this case raid_disks will be 0, and the major_version field is | |
6247 | * use to determine which style super-blocks are to be found on the devices. | |
6248 | * The minor and patch _version numbers are also kept incase the | |
6249 | * super_block handler wishes to interpret them. | |
6250 | */ | |
f72ffdd6 | 6251 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6252 | { |
6253 | ||
6254 | if (info->raid_disks == 0) { | |
6255 | /* just setting version number for superblock loading */ | |
6256 | if (info->major_version < 0 || | |
50511da3 | 6257 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
6258 | super_types[info->major_version].name == NULL) { |
6259 | /* maybe try to auto-load a module? */ | |
f72ffdd6 | 6260 | printk(KERN_INFO |
1da177e4 LT |
6261 | "md: superblock version %d not known\n", |
6262 | info->major_version); | |
6263 | return -EINVAL; | |
6264 | } | |
6265 | mddev->major_version = info->major_version; | |
6266 | mddev->minor_version = info->minor_version; | |
6267 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 6268 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
6269 | /* ensure mddev_put doesn't delete this now that there |
6270 | * is some minimal configuration. | |
6271 | */ | |
6272 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
6273 | return 0; |
6274 | } | |
6275 | mddev->major_version = MD_MAJOR_VERSION; | |
6276 | mddev->minor_version = MD_MINOR_VERSION; | |
6277 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
6278 | mddev->ctime = get_seconds(); | |
6279 | ||
6280 | mddev->level = info->level; | |
17115e03 | 6281 | mddev->clevel[0] = 0; |
58c0fed4 | 6282 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
6283 | mddev->raid_disks = info->raid_disks; |
6284 | /* don't set md_minor, it is determined by which /dev/md* was | |
6285 | * openned | |
6286 | */ | |
6287 | if (info->state & (1<<MD_SB_CLEAN)) | |
6288 | mddev->recovery_cp = MaxSector; | |
6289 | else | |
6290 | mddev->recovery_cp = 0; | |
6291 | mddev->persistent = ! info->not_persistent; | |
e691063a | 6292 | mddev->external = 0; |
1da177e4 LT |
6293 | |
6294 | mddev->layout = info->layout; | |
9d8f0363 | 6295 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
6296 | |
6297 | mddev->max_disks = MD_SB_DISKS; | |
6298 | ||
e691063a N |
6299 | if (mddev->persistent) |
6300 | mddev->flags = 0; | |
850b2b42 | 6301 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6302 | |
c3d9714e | 6303 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 6304 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 6305 | mddev->bitmap_info.offset = 0; |
b2a2703c | 6306 | |
f6705578 N |
6307 | mddev->reshape_position = MaxSector; |
6308 | ||
1da177e4 LT |
6309 | /* |
6310 | * Generate a 128 bit UUID | |
6311 | */ | |
6312 | get_random_bytes(mddev->uuid, 16); | |
6313 | ||
f6705578 | 6314 | mddev->new_level = mddev->level; |
664e7c41 | 6315 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
6316 | mddev->new_layout = mddev->layout; |
6317 | mddev->delta_disks = 0; | |
2c810cdd | 6318 | mddev->reshape_backwards = 0; |
f6705578 | 6319 | |
1da177e4 LT |
6320 | return 0; |
6321 | } | |
6322 | ||
fd01b88c | 6323 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 6324 | { |
b522adcd DW |
6325 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
6326 | ||
6327 | if (mddev->external_size) | |
6328 | return; | |
6329 | ||
1f403624 DW |
6330 | mddev->array_sectors = array_sectors; |
6331 | } | |
6332 | EXPORT_SYMBOL(md_set_array_sectors); | |
6333 | ||
fd01b88c | 6334 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6335 | { |
3cb03002 | 6336 | struct md_rdev *rdev; |
a35b0d69 | 6337 | int rv; |
d71f9f88 | 6338 | int fit = (num_sectors == 0); |
a35b0d69 N |
6339 | |
6340 | if (mddev->pers->resize == NULL) | |
6341 | return -EINVAL; | |
d71f9f88 AN |
6342 | /* The "num_sectors" is the number of sectors of each device that |
6343 | * is used. This can only make sense for arrays with redundancy. | |
6344 | * linear and raid0 always use whatever space is available. We can only | |
6345 | * consider changing this number if no resync or reconstruction is | |
6346 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6347 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6348 | * of each device. If num_sectors is zero, we find the largest size |
6349 | * that fits. | |
a35b0d69 | 6350 | */ |
f851b60d N |
6351 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
6352 | mddev->sync_thread) | |
a35b0d69 | 6353 | return -EBUSY; |
bd8839e0 N |
6354 | if (mddev->ro) |
6355 | return -EROFS; | |
a4a6125a | 6356 | |
dafb20fa | 6357 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6358 | sector_t avail = rdev->sectors; |
01ab5662 | 6359 | |
d71f9f88 AN |
6360 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6361 | num_sectors = avail; | |
6362 | if (avail < num_sectors) | |
a35b0d69 N |
6363 | return -ENOSPC; |
6364 | } | |
d71f9f88 | 6365 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6366 | if (!rv) |
6367 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6368 | return rv; |
6369 | } | |
6370 | ||
fd01b88c | 6371 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6372 | { |
6373 | int rv; | |
c6563a8c | 6374 | struct md_rdev *rdev; |
da943b99 | 6375 | /* change the number of raid disks */ |
63c70c4f | 6376 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6377 | return -EINVAL; |
bd8839e0 N |
6378 | if (mddev->ro) |
6379 | return -EROFS; | |
da943b99 | 6380 | if (raid_disks <= 0 || |
233fca36 | 6381 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6382 | return -EINVAL; |
f851b60d N |
6383 | if (mddev->sync_thread || |
6384 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6385 | mddev->reshape_position != MaxSector) | |
da943b99 | 6386 | return -EBUSY; |
c6563a8c N |
6387 | |
6388 | rdev_for_each(rdev, mddev) { | |
6389 | if (mddev->raid_disks < raid_disks && | |
6390 | rdev->data_offset < rdev->new_data_offset) | |
6391 | return -EINVAL; | |
6392 | if (mddev->raid_disks > raid_disks && | |
6393 | rdev->data_offset > rdev->new_data_offset) | |
6394 | return -EINVAL; | |
6395 | } | |
6396 | ||
63c70c4f | 6397 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6398 | if (mddev->delta_disks < 0) |
6399 | mddev->reshape_backwards = 1; | |
6400 | else if (mddev->delta_disks > 0) | |
6401 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6402 | |
6403 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6404 | if (rv < 0) { |
de171cb9 | 6405 | mddev->delta_disks = 0; |
2c810cdd N |
6406 | mddev->reshape_backwards = 0; |
6407 | } | |
da943b99 N |
6408 | return rv; |
6409 | } | |
6410 | ||
1da177e4 LT |
6411 | /* |
6412 | * update_array_info is used to change the configuration of an | |
6413 | * on-line array. | |
6414 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6415 | * fields in the info are checked against the array. | |
6416 | * Any differences that cannot be handled will cause an error. | |
6417 | * Normally, only one change can be managed at a time. | |
6418 | */ | |
fd01b88c | 6419 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6420 | { |
6421 | int rv = 0; | |
6422 | int cnt = 0; | |
36fa3063 N |
6423 | int state = 0; |
6424 | ||
6425 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6426 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6427 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6428 | |
6429 | if (mddev->major_version != info->major_version || | |
6430 | mddev->minor_version != info->minor_version || | |
6431 | /* mddev->patch_version != info->patch_version || */ | |
6432 | mddev->ctime != info->ctime || | |
6433 | mddev->level != info->level || | |
6434 | /* mddev->layout != info->layout || */ | |
4e023612 | 6435 | mddev->persistent != !info->not_persistent || |
9d8f0363 | 6436 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6437 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6438 | ((state^info->state) & 0xfffffe00) | |
6439 | ) | |
1da177e4 LT |
6440 | return -EINVAL; |
6441 | /* Check there is only one change */ | |
58c0fed4 AN |
6442 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6443 | cnt++; | |
6444 | if (mddev->raid_disks != info->raid_disks) | |
6445 | cnt++; | |
6446 | if (mddev->layout != info->layout) | |
6447 | cnt++; | |
6448 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6449 | cnt++; | |
6450 | if (cnt == 0) | |
6451 | return 0; | |
6452 | if (cnt > 1) | |
6453 | return -EINVAL; | |
1da177e4 LT |
6454 | |
6455 | if (mddev->layout != info->layout) { | |
6456 | /* Change layout | |
6457 | * we don't need to do anything at the md level, the | |
6458 | * personality will take care of it all. | |
6459 | */ | |
50ac168a | 6460 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6461 | return -EINVAL; |
597a711b N |
6462 | else { |
6463 | mddev->new_layout = info->layout; | |
50ac168a | 6464 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6465 | if (rv) |
6466 | mddev->new_layout = mddev->layout; | |
6467 | return rv; | |
6468 | } | |
1da177e4 | 6469 | } |
58c0fed4 | 6470 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6471 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6472 | |
da943b99 N |
6473 | if (mddev->raid_disks != info->raid_disks) |
6474 | rv = update_raid_disks(mddev, info->raid_disks); | |
6475 | ||
36fa3063 | 6476 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
293467aa GR |
6477 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) { |
6478 | rv = -EINVAL; | |
6479 | goto err; | |
6480 | } | |
6481 | if (mddev->recovery || mddev->sync_thread) { | |
6482 | rv = -EBUSY; | |
6483 | goto err; | |
6484 | } | |
36fa3063 | 6485 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { |
f9209a32 | 6486 | struct bitmap *bitmap; |
36fa3063 | 6487 | /* add the bitmap */ |
293467aa GR |
6488 | if (mddev->bitmap) { |
6489 | rv = -EEXIST; | |
6490 | goto err; | |
6491 | } | |
6492 | if (mddev->bitmap_info.default_offset == 0) { | |
6493 | rv = -EINVAL; | |
6494 | goto err; | |
6495 | } | |
c3d9714e N |
6496 | mddev->bitmap_info.offset = |
6497 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6498 | mddev->bitmap_info.space = |
6499 | mddev->bitmap_info.default_space; | |
36fa3063 | 6500 | mddev->pers->quiesce(mddev, 1); |
f9209a32 GR |
6501 | bitmap = bitmap_create(mddev, -1); |
6502 | if (!IS_ERR(bitmap)) { | |
6503 | mddev->bitmap = bitmap; | |
69e51b44 | 6504 | rv = bitmap_load(mddev); |
ba599aca N |
6505 | } else |
6506 | rv = PTR_ERR(bitmap); | |
36fa3063 N |
6507 | if (rv) |
6508 | bitmap_destroy(mddev); | |
6509 | mddev->pers->quiesce(mddev, 0); | |
6510 | } else { | |
6511 | /* remove the bitmap */ | |
293467aa GR |
6512 | if (!mddev->bitmap) { |
6513 | rv = -ENOENT; | |
6514 | goto err; | |
6515 | } | |
6516 | if (mddev->bitmap->storage.file) { | |
6517 | rv = -EINVAL; | |
6518 | goto err; | |
6519 | } | |
36fa3063 N |
6520 | mddev->pers->quiesce(mddev, 1); |
6521 | bitmap_destroy(mddev); | |
6522 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6523 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6524 | } |
6525 | } | |
850b2b42 | 6526 | md_update_sb(mddev, 1); |
293467aa GR |
6527 | return rv; |
6528 | err: | |
1da177e4 LT |
6529 | return rv; |
6530 | } | |
6531 | ||
fd01b88c | 6532 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6533 | { |
3cb03002 | 6534 | struct md_rdev *rdev; |
1ca69c4b | 6535 | int err = 0; |
1da177e4 LT |
6536 | |
6537 | if (mddev->pers == NULL) | |
6538 | return -ENODEV; | |
6539 | ||
1ca69c4b N |
6540 | rcu_read_lock(); |
6541 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6542 | if (!rdev) |
1ca69c4b N |
6543 | err = -ENODEV; |
6544 | else { | |
6545 | md_error(mddev, rdev); | |
6546 | if (!test_bit(Faulty, &rdev->flags)) | |
6547 | err = -EBUSY; | |
6548 | } | |
6549 | rcu_read_unlock(); | |
6550 | return err; | |
1da177e4 LT |
6551 | } |
6552 | ||
2f9618ce AN |
6553 | /* |
6554 | * We have a problem here : there is no easy way to give a CHS | |
6555 | * virtual geometry. We currently pretend that we have a 2 heads | |
6556 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6557 | * dosfs just mad... ;-) | |
6558 | */ | |
a885c8c4 CH |
6559 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6560 | { | |
fd01b88c | 6561 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6562 | |
6563 | geo->heads = 2; | |
6564 | geo->sectors = 4; | |
49ce6cea | 6565 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6566 | return 0; |
6567 | } | |
6568 | ||
cb335f88 NS |
6569 | static inline bool md_ioctl_valid(unsigned int cmd) |
6570 | { | |
6571 | switch (cmd) { | |
6572 | case ADD_NEW_DISK: | |
6573 | case BLKROSET: | |
6574 | case GET_ARRAY_INFO: | |
6575 | case GET_BITMAP_FILE: | |
6576 | case GET_DISK_INFO: | |
6577 | case HOT_ADD_DISK: | |
6578 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
6579 | case RAID_AUTORUN: |
6580 | case RAID_VERSION: | |
6581 | case RESTART_ARRAY_RW: | |
6582 | case RUN_ARRAY: | |
6583 | case SET_ARRAY_INFO: | |
6584 | case SET_BITMAP_FILE: | |
6585 | case SET_DISK_FAULTY: | |
6586 | case STOP_ARRAY: | |
6587 | case STOP_ARRAY_RO: | |
1aee41f6 | 6588 | case CLUSTERED_DISK_NACK: |
cb335f88 NS |
6589 | return true; |
6590 | default: | |
6591 | return false; | |
6592 | } | |
6593 | } | |
6594 | ||
a39907fa | 6595 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6596 | unsigned int cmd, unsigned long arg) |
6597 | { | |
6598 | int err = 0; | |
6599 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6600 | struct mddev *mddev = NULL; |
e2218350 | 6601 | int ro; |
1da177e4 | 6602 | |
cb335f88 NS |
6603 | if (!md_ioctl_valid(cmd)) |
6604 | return -ENOTTY; | |
6605 | ||
506c9e44 N |
6606 | switch (cmd) { |
6607 | case RAID_VERSION: | |
6608 | case GET_ARRAY_INFO: | |
6609 | case GET_DISK_INFO: | |
6610 | break; | |
6611 | default: | |
6612 | if (!capable(CAP_SYS_ADMIN)) | |
6613 | return -EACCES; | |
6614 | } | |
1da177e4 LT |
6615 | |
6616 | /* | |
6617 | * Commands dealing with the RAID driver but not any | |
6618 | * particular array: | |
6619 | */ | |
c02c0aeb N |
6620 | switch (cmd) { |
6621 | case RAID_VERSION: | |
6622 | err = get_version(argp); | |
3adc28d8 | 6623 | goto out; |
1da177e4 | 6624 | |
1da177e4 | 6625 | #ifndef MODULE |
c02c0aeb N |
6626 | case RAID_AUTORUN: |
6627 | err = 0; | |
6628 | autostart_arrays(arg); | |
3adc28d8 | 6629 | goto out; |
1da177e4 | 6630 | #endif |
c02c0aeb | 6631 | default:; |
1da177e4 LT |
6632 | } |
6633 | ||
6634 | /* | |
6635 | * Commands creating/starting a new array: | |
6636 | */ | |
6637 | ||
a39907fa | 6638 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6639 | |
6640 | if (!mddev) { | |
6641 | BUG(); | |
3adc28d8 | 6642 | goto out; |
1da177e4 LT |
6643 | } |
6644 | ||
1ca69c4b N |
6645 | /* Some actions do not requires the mutex */ |
6646 | switch (cmd) { | |
6647 | case GET_ARRAY_INFO: | |
6648 | if (!mddev->raid_disks && !mddev->external) | |
6649 | err = -ENODEV; | |
6650 | else | |
6651 | err = get_array_info(mddev, argp); | |
3adc28d8 | 6652 | goto out; |
1ca69c4b N |
6653 | |
6654 | case GET_DISK_INFO: | |
6655 | if (!mddev->raid_disks && !mddev->external) | |
6656 | err = -ENODEV; | |
6657 | else | |
6658 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 6659 | goto out; |
1ca69c4b N |
6660 | |
6661 | case SET_DISK_FAULTY: | |
6662 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6663 | goto out; |
4af1a041 N |
6664 | |
6665 | case GET_BITMAP_FILE: | |
6666 | err = get_bitmap_file(mddev, argp); | |
6667 | goto out; | |
6668 | ||
1ca69c4b N |
6669 | } |
6670 | ||
a7a3f08d N |
6671 | if (cmd == ADD_NEW_DISK) |
6672 | /* need to ensure md_delayed_delete() has completed */ | |
6673 | flush_workqueue(md_misc_wq); | |
6674 | ||
90f5f7ad HR |
6675 | if (cmd == HOT_REMOVE_DISK) |
6676 | /* need to ensure recovery thread has run */ | |
6677 | wait_event_interruptible_timeout(mddev->sb_wait, | |
6678 | !test_bit(MD_RECOVERY_NEEDED, | |
6679 | &mddev->flags), | |
6680 | msecs_to_jiffies(5000)); | |
260fa034 N |
6681 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
6682 | /* Need to flush page cache, and ensure no-one else opens | |
6683 | * and writes | |
6684 | */ | |
6685 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 6686 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
6687 | mutex_unlock(&mddev->open_mutex); |
6688 | err = -EBUSY; | |
3adc28d8 | 6689 | goto out; |
260fa034 N |
6690 | } |
6691 | set_bit(MD_STILL_CLOSED, &mddev->flags); | |
6692 | mutex_unlock(&mddev->open_mutex); | |
6693 | sync_blockdev(bdev); | |
6694 | } | |
1da177e4 LT |
6695 | err = mddev_lock(mddev); |
6696 | if (err) { | |
f72ffdd6 | 6697 | printk(KERN_INFO |
1da177e4 LT |
6698 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
6699 | err, cmd); | |
3adc28d8 | 6700 | goto out; |
1da177e4 LT |
6701 | } |
6702 | ||
c02c0aeb N |
6703 | if (cmd == SET_ARRAY_INFO) { |
6704 | mdu_array_info_t info; | |
6705 | if (!arg) | |
6706 | memset(&info, 0, sizeof(info)); | |
6707 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6708 | err = -EFAULT; | |
3adc28d8 | 6709 | goto unlock; |
c02c0aeb N |
6710 | } |
6711 | if (mddev->pers) { | |
6712 | err = update_array_info(mddev, &info); | |
6713 | if (err) { | |
6714 | printk(KERN_WARNING "md: couldn't update" | |
6715 | " array info. %d\n", err); | |
3adc28d8 | 6716 | goto unlock; |
1da177e4 | 6717 | } |
3adc28d8 | 6718 | goto unlock; |
c02c0aeb N |
6719 | } |
6720 | if (!list_empty(&mddev->disks)) { | |
6721 | printk(KERN_WARNING | |
6722 | "md: array %s already has disks!\n", | |
6723 | mdname(mddev)); | |
6724 | err = -EBUSY; | |
3adc28d8 | 6725 | goto unlock; |
c02c0aeb N |
6726 | } |
6727 | if (mddev->raid_disks) { | |
6728 | printk(KERN_WARNING | |
6729 | "md: array %s already initialised!\n", | |
6730 | mdname(mddev)); | |
6731 | err = -EBUSY; | |
3adc28d8 | 6732 | goto unlock; |
c02c0aeb N |
6733 | } |
6734 | err = set_array_info(mddev, &info); | |
6735 | if (err) { | |
6736 | printk(KERN_WARNING "md: couldn't set" | |
6737 | " array info. %d\n", err); | |
3adc28d8 | 6738 | goto unlock; |
c02c0aeb | 6739 | } |
3adc28d8 | 6740 | goto unlock; |
1da177e4 LT |
6741 | } |
6742 | ||
6743 | /* | |
6744 | * Commands querying/configuring an existing array: | |
6745 | */ | |
32a7627c | 6746 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6747 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6748 | if ((!mddev->raid_disks && !mddev->external) |
6749 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6750 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6751 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 6752 | err = -ENODEV; |
3adc28d8 | 6753 | goto unlock; |
1da177e4 LT |
6754 | } |
6755 | ||
6756 | /* | |
6757 | * Commands even a read-only array can execute: | |
6758 | */ | |
c02c0aeb | 6759 | switch (cmd) { |
c02c0aeb N |
6760 | case RESTART_ARRAY_RW: |
6761 | err = restart_array(mddev); | |
3adc28d8 | 6762 | goto unlock; |
1da177e4 | 6763 | |
c02c0aeb N |
6764 | case STOP_ARRAY: |
6765 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 6766 | goto unlock; |
1da177e4 | 6767 | |
c02c0aeb N |
6768 | case STOP_ARRAY_RO: |
6769 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 6770 | goto unlock; |
1da177e4 | 6771 | |
3ea8929d N |
6772 | case HOT_REMOVE_DISK: |
6773 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6774 | goto unlock; |
3ea8929d | 6775 | |
7ceb17e8 N |
6776 | case ADD_NEW_DISK: |
6777 | /* We can support ADD_NEW_DISK on read-only arrays | |
6778 | * on if we are re-adding a preexisting device. | |
6779 | * So require mddev->pers and MD_DISK_SYNC. | |
6780 | */ | |
6781 | if (mddev->pers) { | |
6782 | mdu_disk_info_t info; | |
6783 | if (copy_from_user(&info, argp, sizeof(info))) | |
6784 | err = -EFAULT; | |
6785 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6786 | /* Need to clear read-only for this */ | |
6787 | break; | |
6788 | else | |
6789 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6790 | goto unlock; |
7ceb17e8 N |
6791 | } |
6792 | break; | |
6793 | ||
c02c0aeb N |
6794 | case BLKROSET: |
6795 | if (get_user(ro, (int __user *)(arg))) { | |
6796 | err = -EFAULT; | |
3adc28d8 | 6797 | goto unlock; |
c02c0aeb N |
6798 | } |
6799 | err = -EINVAL; | |
e2218350 | 6800 | |
c02c0aeb N |
6801 | /* if the bdev is going readonly the value of mddev->ro |
6802 | * does not matter, no writes are coming | |
6803 | */ | |
6804 | if (ro) | |
3adc28d8 | 6805 | goto unlock; |
e2218350 | 6806 | |
c02c0aeb N |
6807 | /* are we are already prepared for writes? */ |
6808 | if (mddev->ro != 1) | |
3adc28d8 | 6809 | goto unlock; |
e2218350 | 6810 | |
c02c0aeb N |
6811 | /* transitioning to readauto need only happen for |
6812 | * arrays that call md_write_start | |
6813 | */ | |
6814 | if (mddev->pers) { | |
6815 | err = restart_array(mddev); | |
6816 | if (err == 0) { | |
6817 | mddev->ro = 2; | |
6818 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6819 | } |
c02c0aeb | 6820 | } |
3adc28d8 | 6821 | goto unlock; |
1da177e4 LT |
6822 | } |
6823 | ||
6824 | /* | |
6825 | * The remaining ioctls are changing the state of the | |
f91de92e | 6826 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 6827 | */ |
326eb17d | 6828 | if (mddev->ro && mddev->pers) { |
f91de92e N |
6829 | if (mddev->ro == 2) { |
6830 | mddev->ro = 0; | |
00bcb4ac | 6831 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6832 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6833 | /* mddev_unlock will wake thread */ |
6834 | /* If a device failed while we were read-only, we | |
6835 | * need to make sure the metadata is updated now. | |
6836 | */ | |
6837 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6838 | mddev_unlock(mddev); | |
6839 | wait_event(mddev->sb_wait, | |
6840 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6841 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
29f097c4 | 6842 | mddev_lock_nointr(mddev); |
f3378b48 | 6843 | } |
f91de92e N |
6844 | } else { |
6845 | err = -EROFS; | |
3adc28d8 | 6846 | goto unlock; |
f91de92e | 6847 | } |
1da177e4 LT |
6848 | } |
6849 | ||
c02c0aeb N |
6850 | switch (cmd) { |
6851 | case ADD_NEW_DISK: | |
1da177e4 | 6852 | { |
c02c0aeb N |
6853 | mdu_disk_info_t info; |
6854 | if (copy_from_user(&info, argp, sizeof(info))) | |
6855 | err = -EFAULT; | |
6856 | else | |
6857 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6858 | goto unlock; |
c02c0aeb | 6859 | } |
1da177e4 | 6860 | |
1aee41f6 GR |
6861 | case CLUSTERED_DISK_NACK: |
6862 | if (mddev_is_clustered(mddev)) | |
6863 | md_cluster_ops->new_disk_ack(mddev, false); | |
6864 | else | |
6865 | err = -EINVAL; | |
6866 | goto unlock; | |
6867 | ||
c02c0aeb N |
6868 | case HOT_ADD_DISK: |
6869 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6870 | goto unlock; |
1da177e4 | 6871 | |
c02c0aeb N |
6872 | case RUN_ARRAY: |
6873 | err = do_md_run(mddev); | |
3adc28d8 | 6874 | goto unlock; |
1da177e4 | 6875 | |
c02c0aeb N |
6876 | case SET_BITMAP_FILE: |
6877 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 6878 | goto unlock; |
32a7627c | 6879 | |
c02c0aeb N |
6880 | default: |
6881 | err = -EINVAL; | |
3adc28d8 | 6882 | goto unlock; |
1da177e4 LT |
6883 | } |
6884 | ||
3adc28d8 | 6885 | unlock: |
d3374825 N |
6886 | if (mddev->hold_active == UNTIL_IOCTL && |
6887 | err != -EINVAL) | |
6888 | mddev->hold_active = 0; | |
1da177e4 | 6889 | mddev_unlock(mddev); |
3adc28d8 | 6890 | out: |
1da177e4 LT |
6891 | return err; |
6892 | } | |
aa98aa31 AB |
6893 | #ifdef CONFIG_COMPAT |
6894 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6895 | unsigned int cmd, unsigned long arg) | |
6896 | { | |
6897 | switch (cmd) { | |
6898 | case HOT_REMOVE_DISK: | |
6899 | case HOT_ADD_DISK: | |
6900 | case SET_DISK_FAULTY: | |
6901 | case SET_BITMAP_FILE: | |
6902 | /* These take in integer arg, do not convert */ | |
6903 | break; | |
6904 | default: | |
6905 | arg = (unsigned long)compat_ptr(arg); | |
6906 | break; | |
6907 | } | |
6908 | ||
6909 | return md_ioctl(bdev, mode, cmd, arg); | |
6910 | } | |
6911 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6912 | |
a39907fa | 6913 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6914 | { |
6915 | /* | |
6916 | * Succeed if we can lock the mddev, which confirms that | |
6917 | * it isn't being stopped right now. | |
6918 | */ | |
fd01b88c | 6919 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6920 | int err; |
6921 | ||
0c098220 YL |
6922 | if (!mddev) |
6923 | return -ENODEV; | |
6924 | ||
d3374825 N |
6925 | if (mddev->gendisk != bdev->bd_disk) { |
6926 | /* we are racing with mddev_put which is discarding this | |
6927 | * bd_disk. | |
6928 | */ | |
6929 | mddev_put(mddev); | |
6930 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6931 | flush_workqueue(md_misc_wq); |
d3374825 N |
6932 | /* Then retry the open from the top */ |
6933 | return -ERESTARTSYS; | |
6934 | } | |
6935 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6936 | ||
c8c00a69 | 6937 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6938 | goto out; |
6939 | ||
6940 | err = 0; | |
f2ea68cf | 6941 | atomic_inc(&mddev->openers); |
260fa034 | 6942 | clear_bit(MD_STILL_CLOSED, &mddev->flags); |
c8c00a69 | 6943 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6944 | |
f0b4f7e2 | 6945 | check_disk_change(bdev); |
1da177e4 LT |
6946 | out: |
6947 | return err; | |
6948 | } | |
6949 | ||
db2a144b | 6950 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6951 | { |
f72ffdd6 | 6952 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6953 | |
52e5f9d1 | 6954 | BUG_ON(!mddev); |
f2ea68cf | 6955 | atomic_dec(&mddev->openers); |
1da177e4 | 6956 | mddev_put(mddev); |
1da177e4 | 6957 | } |
f0b4f7e2 N |
6958 | |
6959 | static int md_media_changed(struct gendisk *disk) | |
6960 | { | |
fd01b88c | 6961 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6962 | |
6963 | return mddev->changed; | |
6964 | } | |
6965 | ||
6966 | static int md_revalidate(struct gendisk *disk) | |
6967 | { | |
fd01b88c | 6968 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6969 | |
6970 | mddev->changed = 0; | |
6971 | return 0; | |
6972 | } | |
83d5cde4 | 6973 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6974 | { |
6975 | .owner = THIS_MODULE, | |
a39907fa AV |
6976 | .open = md_open, |
6977 | .release = md_release, | |
b492b852 | 6978 | .ioctl = md_ioctl, |
aa98aa31 AB |
6979 | #ifdef CONFIG_COMPAT |
6980 | .compat_ioctl = md_compat_ioctl, | |
6981 | #endif | |
a885c8c4 | 6982 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6983 | .media_changed = md_media_changed, |
6984 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6985 | }; |
6986 | ||
f72ffdd6 | 6987 | static int md_thread(void *arg) |
1da177e4 | 6988 | { |
2b8bf345 | 6989 | struct md_thread *thread = arg; |
1da177e4 | 6990 | |
1da177e4 LT |
6991 | /* |
6992 | * md_thread is a 'system-thread', it's priority should be very | |
6993 | * high. We avoid resource deadlocks individually in each | |
6994 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6995 | * the very same RT priority as kswapd, thus we will never get | |
6996 | * into a priority inversion deadlock. | |
6997 | * | |
6998 | * we definitely have to have equal or higher priority than | |
6999 | * bdflush, otherwise bdflush will deadlock if there are too | |
7000 | * many dirty RAID5 blocks. | |
7001 | */ | |
1da177e4 | 7002 | |
6985c43f | 7003 | allow_signal(SIGKILL); |
a6fb0934 | 7004 | while (!kthread_should_stop()) { |
1da177e4 | 7005 | |
93588e22 N |
7006 | /* We need to wait INTERRUPTIBLE so that |
7007 | * we don't add to the load-average. | |
7008 | * That means we need to be sure no signals are | |
7009 | * pending | |
7010 | */ | |
7011 | if (signal_pending(current)) | |
7012 | flush_signals(current); | |
7013 | ||
7014 | wait_event_interruptible_timeout | |
7015 | (thread->wqueue, | |
7016 | test_bit(THREAD_WAKEUP, &thread->flags) | |
7017 | || kthread_should_stop(), | |
7018 | thread->timeout); | |
1da177e4 | 7019 | |
6c987910 N |
7020 | clear_bit(THREAD_WAKEUP, &thread->flags); |
7021 | if (!kthread_should_stop()) | |
4ed8731d | 7022 | thread->run(thread); |
1da177e4 | 7023 | } |
a6fb0934 | 7024 | |
1da177e4 LT |
7025 | return 0; |
7026 | } | |
7027 | ||
2b8bf345 | 7028 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
7029 | { |
7030 | if (thread) { | |
36a4e1fe | 7031 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
7032 | set_bit(THREAD_WAKEUP, &thread->flags); |
7033 | wake_up(&thread->wqueue); | |
7034 | } | |
7035 | } | |
6c144d31 | 7036 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 7037 | |
4ed8731d SL |
7038 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
7039 | struct mddev *mddev, const char *name) | |
1da177e4 | 7040 | { |
2b8bf345 | 7041 | struct md_thread *thread; |
1da177e4 | 7042 | |
2b8bf345 | 7043 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
7044 | if (!thread) |
7045 | return NULL; | |
7046 | ||
1da177e4 LT |
7047 | init_waitqueue_head(&thread->wqueue); |
7048 | ||
1da177e4 LT |
7049 | thread->run = run; |
7050 | thread->mddev = mddev; | |
32a7627c | 7051 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
7052 | thread->tsk = kthread_run(md_thread, thread, |
7053 | "%s_%s", | |
7054 | mdname(thread->mddev), | |
0232605d | 7055 | name); |
a6fb0934 | 7056 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
7057 | kfree(thread); |
7058 | return NULL; | |
7059 | } | |
1da177e4 LT |
7060 | return thread; |
7061 | } | |
6c144d31 | 7062 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 7063 | |
2b8bf345 | 7064 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 7065 | { |
2b8bf345 | 7066 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
7067 | if (!thread) |
7068 | return; | |
36a4e1fe | 7069 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
7070 | /* Locking ensures that mddev_unlock does not wake_up a |
7071 | * non-existent thread | |
7072 | */ | |
7073 | spin_lock(&pers_lock); | |
7074 | *threadp = NULL; | |
7075 | spin_unlock(&pers_lock); | |
a6fb0934 N |
7076 | |
7077 | kthread_stop(thread->tsk); | |
1da177e4 LT |
7078 | kfree(thread); |
7079 | } | |
6c144d31 | 7080 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 7081 | |
fd01b88c | 7082 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7083 | { |
b2d444d7 | 7084 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 7085 | return; |
6bfe0b49 | 7086 | |
de393cde | 7087 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
7088 | return; |
7089 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
7090 | if (mddev->degraded) |
7091 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 7092 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
7093 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7094 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7095 | md_wakeup_thread(mddev->thread); | |
768a418d | 7096 | if (mddev->event_work.func) |
e804ac78 | 7097 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 7098 | md_new_event_inintr(mddev); |
1da177e4 | 7099 | } |
6c144d31 | 7100 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
7101 | |
7102 | /* seq_file implementation /proc/mdstat */ | |
7103 | ||
7104 | static void status_unused(struct seq_file *seq) | |
7105 | { | |
7106 | int i = 0; | |
3cb03002 | 7107 | struct md_rdev *rdev; |
1da177e4 LT |
7108 | |
7109 | seq_printf(seq, "unused devices: "); | |
7110 | ||
159ec1fc | 7111 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
7112 | char b[BDEVNAME_SIZE]; |
7113 | i++; | |
7114 | seq_printf(seq, "%s ", | |
7115 | bdevname(rdev->bdev,b)); | |
7116 | } | |
7117 | if (!i) | |
7118 | seq_printf(seq, "<none>"); | |
7119 | ||
7120 | seq_printf(seq, "\n"); | |
7121 | } | |
7122 | ||
f7851be7 | 7123 | static int status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 7124 | { |
dd71cf6b N |
7125 | sector_t max_sectors, resync, res; |
7126 | unsigned long dt, db; | |
7127 | sector_t rt; | |
4588b42e N |
7128 | int scale; |
7129 | unsigned int per_milli; | |
1da177e4 | 7130 | |
c804cdec N |
7131 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
7132 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 7133 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 7134 | else |
dd71cf6b | 7135 | max_sectors = mddev->dev_sectors; |
1da177e4 | 7136 | |
f7851be7 N |
7137 | resync = mddev->curr_resync; |
7138 | if (resync <= 3) { | |
7139 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7140 | /* Still cleaning up */ | |
7141 | resync = max_sectors; | |
7142 | } else | |
7143 | resync -= atomic_read(&mddev->recovery_active); | |
7144 | ||
7145 | if (resync == 0) { | |
7146 | if (mddev->recovery_cp < MaxSector) { | |
7147 | seq_printf(seq, "\tresync=PENDING"); | |
7148 | return 1; | |
7149 | } | |
7150 | return 0; | |
7151 | } | |
7152 | if (resync < 3) { | |
7153 | seq_printf(seq, "\tresync=DELAYED"); | |
7154 | return 1; | |
7155 | } | |
7156 | ||
403df478 | 7157 | WARN_ON(max_sectors == 0); |
4588b42e | 7158 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 7159 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
7160 | * u32, as those are the requirements for sector_div. |
7161 | * Thus 'scale' must be at least 10 | |
7162 | */ | |
7163 | scale = 10; | |
7164 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 7165 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
7166 | scale++; |
7167 | } | |
7168 | res = (resync>>scale)*1000; | |
dd71cf6b | 7169 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
7170 | |
7171 | per_milli = res; | |
1da177e4 | 7172 | { |
4588b42e | 7173 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
7174 | seq_printf(seq, "["); |
7175 | for (i = 0; i < x; i++) | |
7176 | seq_printf(seq, "="); | |
7177 | seq_printf(seq, ">"); | |
7178 | for (i = 0; i < y; i++) | |
7179 | seq_printf(seq, "."); | |
7180 | seq_printf(seq, "] "); | |
7181 | } | |
4588b42e | 7182 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
7183 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
7184 | "reshape" : | |
61df9d91 N |
7185 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
7186 | "check" : | |
7187 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
7188 | "resync" : "recovery"))), | |
7189 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
7190 | (unsigned long long) resync/2, |
7191 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
7192 | |
7193 | /* | |
1da177e4 LT |
7194 | * dt: time from mark until now |
7195 | * db: blocks written from mark until now | |
7196 | * rt: remaining time | |
dd71cf6b N |
7197 | * |
7198 | * rt is a sector_t, so could be 32bit or 64bit. | |
7199 | * So we divide before multiply in case it is 32bit and close | |
7200 | * to the limit. | |
25985edc | 7201 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
7202 | * near the end of resync when the number of remaining sectors |
7203 | * is close to 'db'. | |
7204 | * We then divide rt by 32 after multiplying by db to compensate. | |
7205 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
7206 | */ |
7207 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
7208 | if (!dt) dt++; | |
ff4e8d9a N |
7209 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
7210 | - mddev->resync_mark_cnt; | |
1da177e4 | 7211 | |
dd71cf6b N |
7212 | rt = max_sectors - resync; /* number of remaining sectors */ |
7213 | sector_div(rt, db/32+1); | |
7214 | rt *= dt; | |
7215 | rt >>= 5; | |
7216 | ||
7217 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
7218 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 7219 | |
ff4e8d9a | 7220 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
f7851be7 | 7221 | return 1; |
1da177e4 LT |
7222 | } |
7223 | ||
7224 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
7225 | { | |
7226 | struct list_head *tmp; | |
7227 | loff_t l = *pos; | |
fd01b88c | 7228 | struct mddev *mddev; |
1da177e4 LT |
7229 | |
7230 | if (l >= 0x10000) | |
7231 | return NULL; | |
7232 | if (!l--) | |
7233 | /* header */ | |
7234 | return (void*)1; | |
7235 | ||
7236 | spin_lock(&all_mddevs_lock); | |
7237 | list_for_each(tmp,&all_mddevs) | |
7238 | if (!l--) { | |
fd01b88c | 7239 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
7240 | mddev_get(mddev); |
7241 | spin_unlock(&all_mddevs_lock); | |
7242 | return mddev; | |
7243 | } | |
7244 | spin_unlock(&all_mddevs_lock); | |
7245 | if (!l--) | |
7246 | return (void*)2;/* tail */ | |
7247 | return NULL; | |
7248 | } | |
7249 | ||
7250 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
7251 | { | |
7252 | struct list_head *tmp; | |
fd01b88c | 7253 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 7254 | |
1da177e4 LT |
7255 | ++*pos; |
7256 | if (v == (void*)2) | |
7257 | return NULL; | |
7258 | ||
7259 | spin_lock(&all_mddevs_lock); | |
7260 | if (v == (void*)1) | |
7261 | tmp = all_mddevs.next; | |
7262 | else | |
7263 | tmp = mddev->all_mddevs.next; | |
7264 | if (tmp != &all_mddevs) | |
fd01b88c | 7265 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
7266 | else { |
7267 | next_mddev = (void*)2; | |
7268 | *pos = 0x10000; | |
f72ffdd6 | 7269 | } |
1da177e4 LT |
7270 | spin_unlock(&all_mddevs_lock); |
7271 | ||
7272 | if (v != (void*)1) | |
7273 | mddev_put(mddev); | |
7274 | return next_mddev; | |
7275 | ||
7276 | } | |
7277 | ||
7278 | static void md_seq_stop(struct seq_file *seq, void *v) | |
7279 | { | |
fd01b88c | 7280 | struct mddev *mddev = v; |
1da177e4 LT |
7281 | |
7282 | if (mddev && v != (void*)1 && v != (void*)2) | |
7283 | mddev_put(mddev); | |
7284 | } | |
7285 | ||
7286 | static int md_seq_show(struct seq_file *seq, void *v) | |
7287 | { | |
fd01b88c | 7288 | struct mddev *mddev = v; |
dd8ac336 | 7289 | sector_t sectors; |
3cb03002 | 7290 | struct md_rdev *rdev; |
1da177e4 LT |
7291 | |
7292 | if (v == (void*)1) { | |
84fc4b56 | 7293 | struct md_personality *pers; |
1da177e4 LT |
7294 | seq_printf(seq, "Personalities : "); |
7295 | spin_lock(&pers_lock); | |
2604b703 N |
7296 | list_for_each_entry(pers, &pers_list, list) |
7297 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
7298 | |
7299 | spin_unlock(&pers_lock); | |
7300 | seq_printf(seq, "\n"); | |
f1514638 | 7301 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
7302 | return 0; |
7303 | } | |
7304 | if (v == (void*)2) { | |
7305 | status_unused(seq); | |
7306 | return 0; | |
7307 | } | |
7308 | ||
36d091f4 | 7309 | spin_lock(&mddev->lock); |
1da177e4 LT |
7310 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
7311 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
7312 | mddev->pers ? "" : "in"); | |
7313 | if (mddev->pers) { | |
f91de92e | 7314 | if (mddev->ro==1) |
1da177e4 | 7315 | seq_printf(seq, " (read-only)"); |
f91de92e | 7316 | if (mddev->ro==2) |
52720ae7 | 7317 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
7318 | seq_printf(seq, " %s", mddev->pers->name); |
7319 | } | |
7320 | ||
dd8ac336 | 7321 | sectors = 0; |
f97fcad3 N |
7322 | rcu_read_lock(); |
7323 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 LT |
7324 | char b[BDEVNAME_SIZE]; |
7325 | seq_printf(seq, " %s[%d]", | |
7326 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
7327 | if (test_bit(WriteMostly, &rdev->flags)) |
7328 | seq_printf(seq, "(W)"); | |
b2d444d7 | 7329 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7330 | seq_printf(seq, "(F)"); |
7331 | continue; | |
2d78f8c4 N |
7332 | } |
7333 | if (rdev->raid_disk < 0) | |
b325a32e | 7334 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
7335 | if (test_bit(Replacement, &rdev->flags)) |
7336 | seq_printf(seq, "(R)"); | |
dd8ac336 | 7337 | sectors += rdev->sectors; |
1da177e4 | 7338 | } |
f97fcad3 | 7339 | rcu_read_unlock(); |
1da177e4 LT |
7340 | |
7341 | if (!list_empty(&mddev->disks)) { | |
7342 | if (mddev->pers) | |
7343 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
7344 | (unsigned long long) |
7345 | mddev->array_sectors / 2); | |
1da177e4 LT |
7346 | else |
7347 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 7348 | (unsigned long long)sectors / 2); |
1da177e4 | 7349 | } |
1cd6bf19 N |
7350 | if (mddev->persistent) { |
7351 | if (mddev->major_version != 0 || | |
7352 | mddev->minor_version != 90) { | |
7353 | seq_printf(seq," super %d.%d", | |
7354 | mddev->major_version, | |
7355 | mddev->minor_version); | |
7356 | } | |
e691063a N |
7357 | } else if (mddev->external) |
7358 | seq_printf(seq, " super external:%s", | |
7359 | mddev->metadata_type); | |
7360 | else | |
1cd6bf19 | 7361 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
7362 | |
7363 | if (mddev->pers) { | |
d710e138 | 7364 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 7365 | seq_printf(seq, "\n "); |
8e1b39d6 | 7366 | if (mddev->pers->sync_request) { |
f7851be7 | 7367 | if (status_resync(seq, mddev)) |
8e1b39d6 | 7368 | seq_printf(seq, "\n "); |
8e1b39d6 | 7369 | } |
32a7627c N |
7370 | } else |
7371 | seq_printf(seq, "\n "); | |
7372 | ||
57148964 | 7373 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7374 | |
7375 | seq_printf(seq, "\n"); | |
7376 | } | |
36d091f4 | 7377 | spin_unlock(&mddev->lock); |
f72ffdd6 | 7378 | |
1da177e4 LT |
7379 | return 0; |
7380 | } | |
7381 | ||
110518bc | 7382 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7383 | .start = md_seq_start, |
7384 | .next = md_seq_next, | |
7385 | .stop = md_seq_stop, | |
7386 | .show = md_seq_show, | |
7387 | }; | |
7388 | ||
7389 | static int md_seq_open(struct inode *inode, struct file *file) | |
7390 | { | |
f1514638 | 7391 | struct seq_file *seq; |
1da177e4 LT |
7392 | int error; |
7393 | ||
7394 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7395 | if (error) |
f1514638 KS |
7396 | return error; |
7397 | ||
7398 | seq = file->private_data; | |
7399 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7400 | return error; |
7401 | } | |
7402 | ||
e2f23b60 | 7403 | static int md_unloading; |
d7603b7e N |
7404 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7405 | { | |
f1514638 | 7406 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7407 | int mask; |
7408 | ||
e2f23b60 | 7409 | if (md_unloading) |
7d7e64f2 | 7410 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7411 | poll_wait(filp, &md_event_waiters, wait); |
7412 | ||
7413 | /* always allow read */ | |
7414 | mask = POLLIN | POLLRDNORM; | |
7415 | ||
f1514638 | 7416 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7417 | mask |= POLLERR | POLLPRI; |
7418 | return mask; | |
7419 | } | |
7420 | ||
fa027c2a | 7421 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7422 | .owner = THIS_MODULE, |
1da177e4 LT |
7423 | .open = md_seq_open, |
7424 | .read = seq_read, | |
7425 | .llseek = seq_lseek, | |
c3f94b40 | 7426 | .release = seq_release_private, |
d7603b7e | 7427 | .poll = mdstat_poll, |
1da177e4 LT |
7428 | }; |
7429 | ||
84fc4b56 | 7430 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7431 | { |
50bd3774 CY |
7432 | printk(KERN_INFO "md: %s personality registered for level %d\n", |
7433 | p->name, p->level); | |
1da177e4 | 7434 | spin_lock(&pers_lock); |
2604b703 | 7435 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7436 | spin_unlock(&pers_lock); |
7437 | return 0; | |
7438 | } | |
6c144d31 | 7439 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7440 | |
84fc4b56 | 7441 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7442 | { |
2604b703 | 7443 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7444 | spin_lock(&pers_lock); |
2604b703 | 7445 | list_del_init(&p->list); |
1da177e4 LT |
7446 | spin_unlock(&pers_lock); |
7447 | return 0; | |
7448 | } | |
6c144d31 | 7449 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7450 | |
6022e75b N |
7451 | int register_md_cluster_operations(struct md_cluster_operations *ops, |
7452 | struct module *module) | |
edb39c9d | 7453 | { |
6022e75b | 7454 | int ret = 0; |
edb39c9d | 7455 | spin_lock(&pers_lock); |
6022e75b N |
7456 | if (md_cluster_ops != NULL) |
7457 | ret = -EALREADY; | |
7458 | else { | |
7459 | md_cluster_ops = ops; | |
7460 | md_cluster_mod = module; | |
7461 | } | |
edb39c9d | 7462 | spin_unlock(&pers_lock); |
6022e75b | 7463 | return ret; |
edb39c9d GR |
7464 | } |
7465 | EXPORT_SYMBOL(register_md_cluster_operations); | |
7466 | ||
7467 | int unregister_md_cluster_operations(void) | |
7468 | { | |
7469 | spin_lock(&pers_lock); | |
7470 | md_cluster_ops = NULL; | |
7471 | spin_unlock(&pers_lock); | |
7472 | return 0; | |
7473 | } | |
7474 | EXPORT_SYMBOL(unregister_md_cluster_operations); | |
7475 | ||
7476 | int md_setup_cluster(struct mddev *mddev, int nodes) | |
7477 | { | |
7478 | int err; | |
7479 | ||
7480 | err = request_module("md-cluster"); | |
7481 | if (err) { | |
7482 | pr_err("md-cluster module not found.\n"); | |
b0c26a79 | 7483 | return -ENOENT; |
edb39c9d GR |
7484 | } |
7485 | ||
7486 | spin_lock(&pers_lock); | |
7487 | if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { | |
7488 | spin_unlock(&pers_lock); | |
7489 | return -ENOENT; | |
7490 | } | |
7491 | spin_unlock(&pers_lock); | |
7492 | ||
cf921cc1 | 7493 | return md_cluster_ops->join(mddev, nodes); |
edb39c9d GR |
7494 | } |
7495 | ||
7496 | void md_cluster_stop(struct mddev *mddev) | |
7497 | { | |
c4ce867f GR |
7498 | if (!md_cluster_ops) |
7499 | return; | |
edb39c9d GR |
7500 | md_cluster_ops->leave(mddev); |
7501 | module_put(md_cluster_mod); | |
7502 | } | |
7503 | ||
fd01b88c | 7504 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7505 | { |
f72ffdd6 | 7506 | struct md_rdev *rdev; |
1da177e4 | 7507 | int idle; |
eea1bf38 | 7508 | int curr_events; |
1da177e4 LT |
7509 | |
7510 | idle = 1; | |
4b80991c N |
7511 | rcu_read_lock(); |
7512 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7513 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7514 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7515 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7516 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7517 | /* sync IO will cause sync_io to increase before the disk_stats |
7518 | * as sync_io is counted when a request starts, and | |
7519 | * disk_stats is counted when it completes. | |
7520 | * So resync activity will cause curr_events to be smaller than | |
7521 | * when there was no such activity. | |
7522 | * non-sync IO will cause disk_stat to increase without | |
7523 | * increasing sync_io so curr_events will (eventually) | |
7524 | * be larger than it was before. Once it becomes | |
7525 | * substantially larger, the test below will cause | |
7526 | * the array to appear non-idle, and resync will slow | |
7527 | * down. | |
7528 | * If there is a lot of outstanding resync activity when | |
7529 | * we set last_event to curr_events, then all that activity | |
7530 | * completing might cause the array to appear non-idle | |
7531 | * and resync will be slowed down even though there might | |
7532 | * not have been non-resync activity. This will only | |
7533 | * happen once though. 'last_events' will soon reflect | |
7534 | * the state where there is little or no outstanding | |
7535 | * resync requests, and further resync activity will | |
7536 | * always make curr_events less than last_events. | |
c0e48521 | 7537 | * |
1da177e4 | 7538 | */ |
eea1bf38 | 7539 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7540 | rdev->last_events = curr_events; |
7541 | idle = 0; | |
7542 | } | |
7543 | } | |
4b80991c | 7544 | rcu_read_unlock(); |
1da177e4 LT |
7545 | return idle; |
7546 | } | |
7547 | ||
fd01b88c | 7548 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7549 | { |
7550 | /* another "blocks" (512byte) blocks have been synced */ | |
7551 | atomic_sub(blocks, &mddev->recovery_active); | |
7552 | wake_up(&mddev->recovery_wait); | |
7553 | if (!ok) { | |
dfc70645 | 7554 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7555 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7556 | md_wakeup_thread(mddev->thread); |
7557 | // stop recovery, signal do_sync .... | |
7558 | } | |
7559 | } | |
6c144d31 | 7560 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 7561 | |
06d91a5f N |
7562 | /* md_write_start(mddev, bi) |
7563 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7564 | * in superblock) before writing, schedule a superblock update |
7565 | * and wait for it to complete. | |
06d91a5f | 7566 | */ |
fd01b88c | 7567 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7568 | { |
0fd62b86 | 7569 | int did_change = 0; |
06d91a5f | 7570 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7571 | return; |
06d91a5f | 7572 | |
f91de92e N |
7573 | BUG_ON(mddev->ro == 1); |
7574 | if (mddev->ro == 2) { | |
7575 | /* need to switch to read/write */ | |
7576 | mddev->ro = 0; | |
7577 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7578 | md_wakeup_thread(mddev->thread); | |
25156198 | 7579 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7580 | did_change = 1; |
f91de92e | 7581 | } |
06d91a5f | 7582 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7583 | if (mddev->safemode == 1) |
7584 | mddev->safemode = 0; | |
06d91a5f | 7585 | if (mddev->in_sync) { |
85572d7c | 7586 | spin_lock(&mddev->lock); |
3d310eb7 N |
7587 | if (mddev->in_sync) { |
7588 | mddev->in_sync = 0; | |
850b2b42 | 7589 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7590 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7591 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7592 | did_change = 1; |
3d310eb7 | 7593 | } |
85572d7c | 7594 | spin_unlock(&mddev->lock); |
06d91a5f | 7595 | } |
0fd62b86 | 7596 | if (did_change) |
00bcb4ac | 7597 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7598 | wait_event(mddev->sb_wait, |
09a44cc1 | 7599 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 | 7600 | } |
6c144d31 | 7601 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 7602 | |
fd01b88c | 7603 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7604 | { |
7605 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7606 | if (mddev->safemode == 2) | |
7607 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7608 | else if (mddev->safemode_delay) |
1da177e4 LT |
7609 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7610 | } | |
7611 | } | |
6c144d31 | 7612 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 7613 | |
2a2275d6 N |
7614 | /* md_allow_write(mddev) |
7615 | * Calling this ensures that the array is marked 'active' so that writes | |
7616 | * may proceed without blocking. It is important to call this before | |
7617 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7618 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7619 | * |
7620 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7621 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7622 | */ |
fd01b88c | 7623 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7624 | { |
7625 | if (!mddev->pers) | |
b5470dc5 | 7626 | return 0; |
2a2275d6 | 7627 | if (mddev->ro) |
b5470dc5 | 7628 | return 0; |
1a0fd497 | 7629 | if (!mddev->pers->sync_request) |
b5470dc5 | 7630 | return 0; |
2a2275d6 | 7631 | |
85572d7c | 7632 | spin_lock(&mddev->lock); |
2a2275d6 N |
7633 | if (mddev->in_sync) { |
7634 | mddev->in_sync = 0; | |
7635 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7636 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7637 | if (mddev->safemode_delay && |
7638 | mddev->safemode == 0) | |
7639 | mddev->safemode = 1; | |
85572d7c | 7640 | spin_unlock(&mddev->lock); |
2a2275d6 | 7641 | md_update_sb(mddev, 0); |
00bcb4ac | 7642 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 | 7643 | } else |
85572d7c | 7644 | spin_unlock(&mddev->lock); |
b5470dc5 | 7645 | |
070dc6dd | 7646 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7647 | return -EAGAIN; |
7648 | else | |
7649 | return 0; | |
2a2275d6 N |
7650 | } |
7651 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7652 | ||
1da177e4 LT |
7653 | #define SYNC_MARKS 10 |
7654 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7655 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7656 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7657 | { |
4ed8731d | 7658 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7659 | struct mddev *mddev2; |
1da177e4 LT |
7660 | unsigned int currspeed = 0, |
7661 | window; | |
ac7e50a3 | 7662 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 7663 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7664 | unsigned long update_time; |
1da177e4 LT |
7665 | sector_t mark_cnt[SYNC_MARKS]; |
7666 | int last_mark,m; | |
7667 | struct list_head *tmp; | |
7668 | sector_t last_check; | |
57afd89f | 7669 | int skipped = 0; |
3cb03002 | 7670 | struct md_rdev *rdev; |
c4a39551 | 7671 | char *desc, *action = NULL; |
7c2c57c9 | 7672 | struct blk_plug plug; |
c186b128 | 7673 | bool cluster_resync_finished = false; |
1da177e4 LT |
7674 | |
7675 | /* just incase thread restarts... */ | |
7676 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7677 | return; | |
3991b31e N |
7678 | if (mddev->ro) {/* never try to sync a read-only array */ |
7679 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 7680 | return; |
3991b31e | 7681 | } |
1da177e4 | 7682 | |
61df9d91 | 7683 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 7684 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 7685 | desc = "data-check"; |
c4a39551 JB |
7686 | action = "check"; |
7687 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 7688 | desc = "requested-resync"; |
c4a39551 JB |
7689 | action = "repair"; |
7690 | } else | |
61df9d91 N |
7691 | desc = "resync"; |
7692 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7693 | desc = "reshape"; | |
7694 | else | |
7695 | desc = "recovery"; | |
7696 | ||
c4a39551 JB |
7697 | mddev->last_sync_action = action ?: desc; |
7698 | ||
1da177e4 LT |
7699 | /* we overload curr_resync somewhat here. |
7700 | * 0 == not engaged in resync at all | |
7701 | * 2 == checking that there is no conflict with another sync | |
7702 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7703 | * commense | |
7704 | * other == active in resync - this many blocks | |
7705 | * | |
7706 | * Before starting a resync we must have set curr_resync to | |
7707 | * 2, and then checked that every "conflicting" array has curr_resync | |
7708 | * less than ours. When we find one that is the same or higher | |
7709 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7710 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7711 | * This will mean we have to start checking from the beginning again. | |
7712 | * | |
7713 | */ | |
7714 | ||
7715 | do { | |
7716 | mddev->curr_resync = 2; | |
7717 | ||
7718 | try_again: | |
404e4b43 | 7719 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 7720 | goto skip; |
29ac4aa3 | 7721 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7722 | if (mddev2 == mddev) |
7723 | continue; | |
90b08710 BS |
7724 | if (!mddev->parallel_resync |
7725 | && mddev2->curr_resync | |
7726 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7727 | DEFINE_WAIT(wq); |
7728 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7729 | /* arbitrarily yield */ | |
7730 | mddev->curr_resync = 1; | |
7731 | wake_up(&resync_wait); | |
7732 | } | |
7733 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7734 | /* no need to wait here, we can wait the next | |
7735 | * time 'round when curr_resync == 2 | |
7736 | */ | |
7737 | continue; | |
9744197c N |
7738 | /* We need to wait 'interruptible' so as not to |
7739 | * contribute to the load average, and not to | |
7740 | * be caught by 'softlockup' | |
7741 | */ | |
7742 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 7743 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 7744 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7745 | printk(KERN_INFO "md: delaying %s of %s" |
7746 | " until %s has finished (they" | |
1da177e4 | 7747 | " share one or more physical units)\n", |
61df9d91 | 7748 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7749 | mddev_put(mddev2); |
9744197c N |
7750 | if (signal_pending(current)) |
7751 | flush_signals(current); | |
1da177e4 LT |
7752 | schedule(); |
7753 | finish_wait(&resync_wait, &wq); | |
7754 | goto try_again; | |
7755 | } | |
7756 | finish_wait(&resync_wait, &wq); | |
7757 | } | |
7758 | } | |
7759 | } while (mddev->curr_resync < 2); | |
7760 | ||
5fd6c1dc | 7761 | j = 0; |
9d88883e | 7762 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7763 | /* resync follows the size requested by the personality, |
57afd89f | 7764 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7765 | */ |
7766 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7767 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7768 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7769 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7770 | j = mddev->resync_min; | |
7771 | else if (!mddev->bitmap) | |
5fd6c1dc | 7772 | j = mddev->recovery_cp; |
5e96ee65 | 7773 | |
ccfcc3c1 | 7774 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7775 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7776 | else { |
1da177e4 | 7777 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7778 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7779 | j = MaxSector; |
4e59ca7d | 7780 | rcu_read_lock(); |
dafb20fa | 7781 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc N |
7782 | if (rdev->raid_disk >= 0 && |
7783 | !test_bit(Faulty, &rdev->flags) && | |
7784 | !test_bit(In_sync, &rdev->flags) && | |
7785 | rdev->recovery_offset < j) | |
7786 | j = rdev->recovery_offset; | |
4e59ca7d | 7787 | rcu_read_unlock(); |
133d4527 N |
7788 | |
7789 | /* If there is a bitmap, we need to make sure all | |
7790 | * writes that started before we added a spare | |
7791 | * complete before we start doing a recovery. | |
7792 | * Otherwise the write might complete and (via | |
7793 | * bitmap_endwrite) set a bit in the bitmap after the | |
7794 | * recovery has checked that bit and skipped that | |
7795 | * region. | |
7796 | */ | |
7797 | if (mddev->bitmap) { | |
7798 | mddev->pers->quiesce(mddev, 1); | |
7799 | mddev->pers->quiesce(mddev, 0); | |
7800 | } | |
5fd6c1dc | 7801 | } |
1da177e4 | 7802 | |
61df9d91 N |
7803 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7804 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7805 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7806 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7807 | "(but not more than %d KB/sec) for %s.\n", |
7808 | speed_max(mddev), desc); | |
1da177e4 | 7809 | |
eea1bf38 | 7810 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7811 | |
57afd89f | 7812 | io_sectors = 0; |
1da177e4 LT |
7813 | for (m = 0; m < SYNC_MARKS; m++) { |
7814 | mark[m] = jiffies; | |
57afd89f | 7815 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7816 | } |
7817 | last_mark = 0; | |
7818 | mddev->resync_mark = mark[last_mark]; | |
7819 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7820 | ||
7821 | /* | |
7822 | * Tune reconstruction: | |
7823 | */ | |
7824 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7825 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7826 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7827 | |
7828 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7829 | last_check = 0; |
7830 | ||
7831 | if (j>2) { | |
c91abf5a | 7832 | printk(KERN_INFO |
61df9d91 N |
7833 | "md: resuming %s of %s from checkpoint.\n", |
7834 | desc, mdname(mddev)); | |
1da177e4 | 7835 | mddev->curr_resync = j; |
72f36d59 N |
7836 | } else |
7837 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7838 | mddev->curr_resync_completed = j; |
72f36d59 N |
7839 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7840 | md_new_event(mddev); | |
54f89341 | 7841 | update_time = jiffies; |
1da177e4 | 7842 | |
7c2c57c9 | 7843 | blk_start_plug(&plug); |
1da177e4 | 7844 | while (j < max_sectors) { |
57afd89f | 7845 | sector_t sectors; |
1da177e4 | 7846 | |
57afd89f | 7847 | skipped = 0; |
97e4f42d | 7848 | |
7a91ee1f N |
7849 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7850 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7851 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7852 | > (max_sectors >> 4)) || | |
54f89341 | 7853 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f | 7854 | (j - mddev->curr_resync_completed)*2 |
c5e19d90 N |
7855 | >= mddev->resync_max - mddev->curr_resync_completed || |
7856 | mddev->curr_resync_completed > mddev->resync_max | |
7a91ee1f | 7857 | )) { |
97e4f42d | 7858 | /* time to update curr_resync_completed */ |
97e4f42d N |
7859 | wait_event(mddev->recovery_wait, |
7860 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7861 | mddev->curr_resync_completed = j; |
35d78c66 | 7862 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
7863 | j > mddev->recovery_cp) | |
7864 | mddev->recovery_cp = j; | |
54f89341 | 7865 | update_time = jiffies; |
070dc6dd | 7866 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7867 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7868 | } |
acb180b0 | 7869 | |
c91abf5a N |
7870 | while (j >= mddev->resync_max && |
7871 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
7872 | /* As this condition is controlled by user-space, |
7873 | * we can block indefinitely, so use '_interruptible' | |
7874 | * to avoid triggering warnings. | |
7875 | */ | |
7876 | flush_signals(current); /* just in case */ | |
7877 | wait_event_interruptible(mddev->recovery_wait, | |
7878 | mddev->resync_max > j | |
c91abf5a N |
7879 | || test_bit(MD_RECOVERY_INTR, |
7880 | &mddev->recovery)); | |
e62e58a5 | 7881 | } |
acb180b0 | 7882 | |
c91abf5a N |
7883 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7884 | break; | |
acb180b0 | 7885 | |
09314799 | 7886 | sectors = mddev->pers->sync_request(mddev, j, &skipped); |
57afd89f | 7887 | if (sectors == 0) { |
dfc70645 | 7888 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 7889 | break; |
1da177e4 | 7890 | } |
57afd89f N |
7891 | |
7892 | if (!skipped) { /* actual IO requested */ | |
7893 | io_sectors += sectors; | |
7894 | atomic_add(sectors, &mddev->recovery_active); | |
7895 | } | |
7896 | ||
e875ecea N |
7897 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7898 | break; | |
7899 | ||
1da177e4 | 7900 | j += sectors; |
5ed1df2e N |
7901 | if (j > max_sectors) |
7902 | /* when skipping, extra large numbers can be returned. */ | |
7903 | j = max_sectors; | |
72f36d59 N |
7904 | if (j > 2) |
7905 | mddev->curr_resync = j; | |
ff4e8d9a | 7906 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7907 | if (last_check == 0) |
e875ecea | 7908 | /* this is the earliest that rebuild will be |
d7603b7e N |
7909 | * visible in /proc/mdstat |
7910 | */ | |
7911 | md_new_event(mddev); | |
57afd89f N |
7912 | |
7913 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7914 | continue; |
7915 | ||
57afd89f | 7916 | last_check = io_sectors; |
1da177e4 LT |
7917 | repeat: |
7918 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7919 | /* step marks */ | |
7920 | int next = (last_mark+1) % SYNC_MARKS; | |
7921 | ||
7922 | mddev->resync_mark = mark[next]; | |
7923 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7924 | mark[next] = jiffies; | |
57afd89f | 7925 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7926 | last_mark = next; |
7927 | } | |
7928 | ||
c91abf5a N |
7929 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7930 | break; | |
1da177e4 LT |
7931 | |
7932 | /* | |
7933 | * this loop exits only if either when we are slower than | |
7934 | * the 'hard' speed limit, or the system was IO-idle for | |
7935 | * a jiffy. | |
7936 | * the system might be non-idle CPU-wise, but we only care | |
7937 | * about not overloading the IO subsystem. (things like an | |
7938 | * e2fsck being done on the RAID array should execute fast) | |
7939 | */ | |
1da177e4 LT |
7940 | cond_resched(); |
7941 | ||
ac7e50a3 XN |
7942 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
7943 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 7944 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 7945 | |
88202a0c | 7946 | if (currspeed > speed_min(mddev)) { |
ac8fa419 | 7947 | if (currspeed > speed_max(mddev)) { |
c0e48521 | 7948 | msleep(500); |
1da177e4 LT |
7949 | goto repeat; |
7950 | } | |
ac8fa419 N |
7951 | if (!is_mddev_idle(mddev, 0)) { |
7952 | /* | |
7953 | * Give other IO more of a chance. | |
7954 | * The faster the devices, the less we wait. | |
7955 | */ | |
7956 | wait_event(mddev->recovery_wait, | |
7957 | !atomic_read(&mddev->recovery_active)); | |
7958 | } | |
1da177e4 LT |
7959 | } |
7960 | } | |
c91abf5a N |
7961 | printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
7962 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
7963 | ? "interrupted" : "done"); | |
1da177e4 LT |
7964 | /* |
7965 | * this also signals 'finished resyncing' to md_stop | |
7966 | */ | |
7c2c57c9 | 7967 | blk_finish_plug(&plug); |
1da177e4 LT |
7968 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7969 | ||
5ed1df2e N |
7970 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7971 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7972 | mddev->curr_resync > 2) { | |
7973 | mddev->curr_resync_completed = mddev->curr_resync; | |
7974 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
7975 | } | |
c186b128 GR |
7976 | /* tell personality and other nodes that we are finished */ |
7977 | if (mddev_is_clustered(mddev)) { | |
7978 | md_cluster_ops->resync_finish(mddev); | |
7979 | cluster_resync_finished = true; | |
7980 | } | |
09314799 | 7981 | mddev->pers->sync_request(mddev, max_sectors, &skipped); |
1da177e4 | 7982 | |
dfc70645 | 7983 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7984 | mddev->curr_resync > 2) { |
7985 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7986 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7987 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7988 | printk(KERN_INFO | |
61df9d91 N |
7989 | "md: checkpointing %s of %s.\n", |
7990 | desc, mdname(mddev)); | |
0a19caab | 7991 | if (test_bit(MD_RECOVERY_ERROR, |
7992 | &mddev->recovery)) | |
7993 | mddev->recovery_cp = | |
7994 | mddev->curr_resync_completed; | |
7995 | else | |
7996 | mddev->recovery_cp = | |
7997 | mddev->curr_resync; | |
5fd6c1dc N |
7998 | } |
7999 | } else | |
8000 | mddev->recovery_cp = MaxSector; | |
8001 | } else { | |
8002 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
8003 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 8004 | rcu_read_lock(); |
dafb20fa | 8005 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 8006 | if (rdev->raid_disk >= 0 && |
70fffd0b | 8007 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
8008 | !test_bit(Faulty, &rdev->flags) && |
8009 | !test_bit(In_sync, &rdev->flags) && | |
8010 | rdev->recovery_offset < mddev->curr_resync) | |
8011 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 8012 | rcu_read_unlock(); |
5fd6c1dc | 8013 | } |
1da177e4 | 8014 | } |
db91ff55 | 8015 | skip: |
17571284 | 8016 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 8017 | |
c186b128 GR |
8018 | if (mddev_is_clustered(mddev) && |
8019 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8020 | !cluster_resync_finished) | |
8021 | md_cluster_ops->resync_finish(mddev); | |
8022 | ||
23da422b | 8023 | spin_lock(&mddev->lock); |
c07b70ad N |
8024 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
8025 | /* We completed so min/max setting can be forgotten if used. */ | |
8026 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
8027 | mddev->resync_min = 0; | |
8028 | mddev->resync_max = MaxSector; | |
8029 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
8030 | mddev->resync_min = mddev->curr_resync_completed; | |
f7851be7 | 8031 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); |
1da177e4 | 8032 | mddev->curr_resync = 0; |
23da422b N |
8033 | spin_unlock(&mddev->lock); |
8034 | ||
1da177e4 | 8035 | wake_up(&resync_wait); |
1da177e4 | 8036 | md_wakeup_thread(mddev->thread); |
c6207277 | 8037 | return; |
1da177e4 | 8038 | } |
29269553 | 8039 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 8040 | |
746d3207 N |
8041 | static int remove_and_add_spares(struct mddev *mddev, |
8042 | struct md_rdev *this) | |
b4c4c7b8 | 8043 | { |
3cb03002 | 8044 | struct md_rdev *rdev; |
b4c4c7b8 | 8045 | int spares = 0; |
f2a371c5 | 8046 | int removed = 0; |
b4c4c7b8 | 8047 | |
dafb20fa | 8048 | rdev_for_each(rdev, mddev) |
746d3207 N |
8049 | if ((this == NULL || rdev == this) && |
8050 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 8051 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
8052 | (test_bit(Faulty, &rdev->flags) || |
8053 | ! test_bit(In_sync, &rdev->flags)) && | |
8054 | atomic_read(&rdev->nr_pending)==0) { | |
8055 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 8056 | mddev, rdev) == 0) { |
36fad858 | 8057 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 8058 | rdev->raid_disk = -1; |
f2a371c5 | 8059 | removed++; |
b4c4c7b8 N |
8060 | } |
8061 | } | |
90584fc9 JB |
8062 | if (removed && mddev->kobj.sd) |
8063 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 8064 | |
2910ff17 | 8065 | if (this && removed) |
746d3207 N |
8066 | goto no_add; |
8067 | ||
dafb20fa | 8068 | rdev_for_each(rdev, mddev) { |
2910ff17 GR |
8069 | if (this && this != rdev) |
8070 | continue; | |
dbb64f86 GR |
8071 | if (test_bit(Candidate, &rdev->flags)) |
8072 | continue; | |
7bfec5f3 N |
8073 | if (rdev->raid_disk >= 0 && |
8074 | !test_bit(In_sync, &rdev->flags) && | |
8075 | !test_bit(Faulty, &rdev->flags)) | |
8076 | spares++; | |
7ceb17e8 N |
8077 | if (rdev->raid_disk >= 0) |
8078 | continue; | |
8079 | if (test_bit(Faulty, &rdev->flags)) | |
8080 | continue; | |
8081 | if (mddev->ro && | |
8313b8e5 N |
8082 | ! (rdev->saved_raid_disk >= 0 && |
8083 | !test_bit(Bitmap_sync, &rdev->flags))) | |
7ceb17e8 N |
8084 | continue; |
8085 | ||
7eb41885 N |
8086 | if (rdev->saved_raid_disk < 0) |
8087 | rdev->recovery_offset = 0; | |
7ceb17e8 N |
8088 | if (mddev->pers-> |
8089 | hot_add_disk(mddev, rdev) == 0) { | |
8090 | if (sysfs_link_rdev(mddev, rdev)) | |
8091 | /* failure here is OK */; | |
8092 | spares++; | |
8093 | md_new_event(mddev); | |
8094 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 8095 | } |
b4c4c7b8 | 8096 | } |
746d3207 | 8097 | no_add: |
6dafab6b N |
8098 | if (removed) |
8099 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
8100 | return spares; |
8101 | } | |
7ebc0be7 | 8102 | |
ac05f256 N |
8103 | static void md_start_sync(struct work_struct *ws) |
8104 | { | |
8105 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
c186b128 GR |
8106 | int ret = 0; |
8107 | ||
8108 | if (mddev_is_clustered(mddev)) { | |
8109 | ret = md_cluster_ops->resync_start(mddev); | |
8110 | if (ret) { | |
8111 | mddev->sync_thread = NULL; | |
8112 | goto out; | |
8113 | } | |
8114 | } | |
ac05f256 N |
8115 | |
8116 | mddev->sync_thread = md_register_thread(md_do_sync, | |
8117 | mddev, | |
8118 | "resync"); | |
c186b128 | 8119 | out: |
ac05f256 | 8120 | if (!mddev->sync_thread) { |
c186b128 GR |
8121 | if (!(mddev_is_clustered(mddev) && ret == -EAGAIN)) |
8122 | printk(KERN_ERR "%s: could not start resync" | |
8123 | " thread...\n", | |
8124 | mdname(mddev)); | |
ac05f256 N |
8125 | /* leave the spares where they are, it shouldn't hurt */ |
8126 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
8127 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8128 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8129 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
8130 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8131 | wake_up(&resync_wait); |
ac05f256 N |
8132 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8133 | &mddev->recovery)) | |
8134 | if (mddev->sysfs_action) | |
8135 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8136 | } else | |
8137 | md_wakeup_thread(mddev->sync_thread); | |
8138 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8139 | md_new_event(mddev); | |
8140 | } | |
8141 | ||
1da177e4 LT |
8142 | /* |
8143 | * This routine is regularly called by all per-raid-array threads to | |
8144 | * deal with generic issues like resync and super-block update. | |
8145 | * Raid personalities that don't have a thread (linear/raid0) do not | |
8146 | * need this as they never do any recovery or update the superblock. | |
8147 | * | |
8148 | * It does not do any resync itself, but rather "forks" off other threads | |
8149 | * to do that as needed. | |
8150 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
8151 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 8152 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
8153 | * and wakeups up this thread which will reap the thread and finish up. |
8154 | * This thread also removes any faulty devices (with nr_pending == 0). | |
8155 | * | |
8156 | * The overall approach is: | |
8157 | * 1/ if the superblock needs updating, update it. | |
8158 | * 2/ If a recovery thread is running, don't do anything else. | |
8159 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
8160 | * 4/ If there are any faulty devices, remove them. | |
8161 | * 5/ If array is degraded, try to add spares devices | |
8162 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
8163 | */ | |
fd01b88c | 8164 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 8165 | { |
68866e42 JB |
8166 | if (mddev->suspended) |
8167 | return; | |
8168 | ||
5f40402d | 8169 | if (mddev->bitmap) |
aa5cbd10 | 8170 | bitmap_daemon_work(mddev); |
1da177e4 | 8171 | |
fca4d848 | 8172 | if (signal_pending(current)) { |
31a59e34 | 8173 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
8174 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
8175 | mdname(mddev)); | |
8176 | mddev->safemode = 2; | |
8177 | } | |
8178 | flush_signals(current); | |
8179 | } | |
8180 | ||
c89a8eee N |
8181 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
8182 | return; | |
1da177e4 | 8183 | if ( ! ( |
142d44c3 | 8184 | (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 8185 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 8186 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 8187 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
8188 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
8189 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
8190 | )) |
8191 | return; | |
fca4d848 | 8192 | |
df5b89b3 | 8193 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 8194 | int spares = 0; |
fca4d848 | 8195 | |
c89a8eee | 8196 | if (mddev->ro) { |
ab16bfc7 NB |
8197 | struct md_rdev *rdev; |
8198 | if (!mddev->external && mddev->in_sync) | |
8199 | /* 'Blocked' flag not needed as failed devices | |
8200 | * will be recorded if array switched to read/write. | |
8201 | * Leaving it set will prevent the device | |
8202 | * from being removed. | |
8203 | */ | |
8204 | rdev_for_each(rdev, mddev) | |
8205 | clear_bit(Blocked, &rdev->flags); | |
7ceb17e8 N |
8206 | /* On a read-only array we can: |
8207 | * - remove failed devices | |
8208 | * - add already-in_sync devices if the array itself | |
8209 | * is in-sync. | |
8210 | * As we only add devices that are already in-sync, | |
8211 | * we can activate the spares immediately. | |
c89a8eee | 8212 | */ |
7ceb17e8 | 8213 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
8214 | /* There is no thread, but we need to call |
8215 | * ->spare_active and clear saved_raid_disk | |
8216 | */ | |
2ac295a5 | 8217 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 | 8218 | md_reap_sync_thread(mddev); |
a4a3d26d | 8219 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
8313b8e5 | 8220 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
d4929add | 8221 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
c89a8eee N |
8222 | goto unlock; |
8223 | } | |
8224 | ||
31a59e34 | 8225 | if (!mddev->external) { |
0fd62b86 | 8226 | int did_change = 0; |
85572d7c | 8227 | spin_lock(&mddev->lock); |
31a59e34 N |
8228 | if (mddev->safemode && |
8229 | !atomic_read(&mddev->writes_pending) && | |
8230 | !mddev->in_sync && | |
8231 | mddev->recovery_cp == MaxSector) { | |
8232 | mddev->in_sync = 1; | |
0fd62b86 | 8233 | did_change = 1; |
070dc6dd | 8234 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
8235 | } |
8236 | if (mddev->safemode == 1) | |
8237 | mddev->safemode = 0; | |
85572d7c | 8238 | spin_unlock(&mddev->lock); |
0fd62b86 | 8239 | if (did_change) |
00bcb4ac | 8240 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 8241 | } |
fca4d848 | 8242 | |
2aa82191 | 8243 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 8244 | md_update_sb(mddev, 0); |
06d91a5f | 8245 | |
1da177e4 LT |
8246 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
8247 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
8248 | /* resync/recovery still happening */ | |
8249 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8250 | goto unlock; | |
8251 | } | |
8252 | if (mddev->sync_thread) { | |
a91d5ac0 | 8253 | md_reap_sync_thread(mddev); |
1da177e4 LT |
8254 | goto unlock; |
8255 | } | |
72a23c21 NB |
8256 | /* Set RUNNING before clearing NEEDED to avoid |
8257 | * any transients in the value of "sync_action". | |
8258 | */ | |
72f36d59 | 8259 | mddev->curr_resync_completed = 0; |
23da422b | 8260 | spin_lock(&mddev->lock); |
72a23c21 | 8261 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
23da422b | 8262 | spin_unlock(&mddev->lock); |
24dd469d N |
8263 | /* Clear some bits that don't mean anything, but |
8264 | * might be left set | |
8265 | */ | |
24dd469d N |
8266 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8267 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 8268 | |
ed209584 N |
8269 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
8270 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 8271 | goto not_running; |
1da177e4 LT |
8272 | /* no recovery is running. |
8273 | * remove any failed drives, then | |
8274 | * add spares if possible. | |
72f36d59 | 8275 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
8276 | * the personality to fail the re-add. |
8277 | */ | |
1da177e4 | 8278 | |
b4c4c7b8 | 8279 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
8280 | if (mddev->pers->check_reshape == NULL || |
8281 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 8282 | /* Cannot proceed */ |
ac05f256 | 8283 | goto not_running; |
b4c4c7b8 | 8284 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 8285 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 8286 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
8287 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8288 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 8289 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 8290 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8291 | } else if (mddev->recovery_cp < MaxSector) { |
8292 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 8293 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8294 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
8295 | /* nothing to be done ... */ | |
ac05f256 | 8296 | goto not_running; |
24dd469d | 8297 | |
1da177e4 | 8298 | if (mddev->pers->sync_request) { |
ef99bf48 | 8299 | if (spares) { |
a654b9d8 N |
8300 | /* We are adding a device or devices to an array |
8301 | * which has the bitmap stored on all devices. | |
8302 | * So make sure all bitmap pages get written | |
8303 | */ | |
8304 | bitmap_write_all(mddev->bitmap); | |
8305 | } | |
ac05f256 N |
8306 | INIT_WORK(&mddev->del_work, md_start_sync); |
8307 | queue_work(md_misc_wq, &mddev->del_work); | |
8308 | goto unlock; | |
1da177e4 | 8309 | } |
ac05f256 | 8310 | not_running: |
72a23c21 NB |
8311 | if (!mddev->sync_thread) { |
8312 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8313 | wake_up(&resync_wait); |
72a23c21 NB |
8314 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8315 | &mddev->recovery)) | |
0c3573f1 | 8316 | if (mddev->sysfs_action) |
00bcb4ac | 8317 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 8318 | } |
ac05f256 N |
8319 | unlock: |
8320 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
8321 | mddev_unlock(mddev); |
8322 | } | |
8323 | } | |
6c144d31 | 8324 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 8325 | |
a91d5ac0 JB |
8326 | void md_reap_sync_thread(struct mddev *mddev) |
8327 | { | |
8328 | struct md_rdev *rdev; | |
8329 | ||
8330 | /* resync has finished, collect result */ | |
8331 | md_unregister_thread(&mddev->sync_thread); | |
8332 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8333 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
8334 | /* success...*/ | |
8335 | /* activate any spares */ | |
8336 | if (mddev->pers->spare_active(mddev)) { | |
8337 | sysfs_notify(&mddev->kobj, NULL, | |
8338 | "degraded"); | |
8339 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
8340 | } | |
8341 | } | |
8342 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
8343 | mddev->pers->finish_reshape) | |
8344 | mddev->pers->finish_reshape(mddev); | |
8345 | ||
8346 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 8347 | * information must be scrapped. |
a91d5ac0 | 8348 | */ |
f466722c N |
8349 | if (!mddev->degraded) |
8350 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
8351 | rdev->saved_raid_disk = -1; |
8352 | ||
8353 | md_update_sb(mddev, 1); | |
8354 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
ea358cd0 | 8355 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
a91d5ac0 JB |
8356 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8357 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8358 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8359 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 8360 | wake_up(&resync_wait); |
a91d5ac0 JB |
8361 | /* flag recovery needed just to double check */ |
8362 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8363 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8364 | md_new_event(mddev); | |
8365 | if (mddev->event_work.func) | |
8366 | queue_work(md_misc_wq, &mddev->event_work); | |
8367 | } | |
6c144d31 | 8368 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 8369 | |
fd01b88c | 8370 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 8371 | { |
00bcb4ac | 8372 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 8373 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
8374 | !test_bit(Blocked, &rdev->flags) && |
8375 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
8376 | msecs_to_jiffies(5000)); |
8377 | rdev_dec_pending(rdev, mddev); | |
8378 | } | |
8379 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
8380 | ||
c6563a8c N |
8381 | void md_finish_reshape(struct mddev *mddev) |
8382 | { | |
8383 | /* called be personality module when reshape completes. */ | |
8384 | struct md_rdev *rdev; | |
8385 | ||
8386 | rdev_for_each(rdev, mddev) { | |
8387 | if (rdev->data_offset > rdev->new_data_offset) | |
8388 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
8389 | else | |
8390 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
8391 | rdev->data_offset = rdev->new_data_offset; | |
8392 | } | |
8393 | } | |
8394 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
8395 | |
8396 | /* Bad block management. | |
8397 | * We can record which blocks on each device are 'bad' and so just | |
8398 | * fail those blocks, or that stripe, rather than the whole device. | |
8399 | * Entries in the bad-block table are 64bits wide. This comprises: | |
8400 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
8401 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
8402 | * A 'shift' can be set so that larger blocks are tracked and | |
8403 | * consequently larger devices can be covered. | |
8404 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
8405 | * | |
8406 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
8407 | * might need to retry if it is very unlucky. | |
8408 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
8409 | * so we use the write_seqlock_irq variant. | |
8410 | * | |
8411 | * When looking for a bad block we specify a range and want to | |
8412 | * know if any block in the range is bad. So we binary-search | |
8413 | * to the last range that starts at-or-before the given endpoint, | |
8414 | * (or "before the sector after the target range") | |
8415 | * then see if it ends after the given start. | |
8416 | * We return | |
8417 | * 0 if there are no known bad blocks in the range | |
8418 | * 1 if there are known bad block which are all acknowledged | |
8419 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
8420 | * plus the start/length of the first bad section we overlap. | |
8421 | */ | |
8422 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
8423 | sector_t *first_bad, int *bad_sectors) | |
8424 | { | |
8425 | int hi; | |
ab05613a | 8426 | int lo; |
2230dfe4 | 8427 | u64 *p = bb->page; |
ab05613a | 8428 | int rv; |
2230dfe4 N |
8429 | sector_t target = s + sectors; |
8430 | unsigned seq; | |
8431 | ||
8432 | if (bb->shift > 0) { | |
8433 | /* round the start down, and the end up */ | |
8434 | s >>= bb->shift; | |
8435 | target += (1<<bb->shift) - 1; | |
8436 | target >>= bb->shift; | |
8437 | sectors = target - s; | |
8438 | } | |
8439 | /* 'target' is now the first block after the bad range */ | |
8440 | ||
8441 | retry: | |
8442 | seq = read_seqbegin(&bb->lock); | |
ab05613a | 8443 | lo = 0; |
8444 | rv = 0; | |
2230dfe4 N |
8445 | hi = bb->count; |
8446 | ||
8447 | /* Binary search between lo and hi for 'target' | |
8448 | * i.e. for the last range that starts before 'target' | |
8449 | */ | |
8450 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
8451 | * are known not to be the last range before target. | |
8452 | * VARIANT: hi-lo is the number of possible | |
8453 | * ranges, and decreases until it reaches 1 | |
8454 | */ | |
8455 | while (hi - lo > 1) { | |
8456 | int mid = (lo + hi) / 2; | |
8457 | sector_t a = BB_OFFSET(p[mid]); | |
8458 | if (a < target) | |
8459 | /* This could still be the one, earlier ranges | |
8460 | * could not. */ | |
8461 | lo = mid; | |
8462 | else | |
8463 | /* This and later ranges are definitely out. */ | |
8464 | hi = mid; | |
8465 | } | |
8466 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
8467 | if (hi > lo) { | |
8468 | /* need to check all range that end after 's' to see if | |
8469 | * any are unacknowledged. | |
8470 | */ | |
8471 | while (lo >= 0 && | |
8472 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8473 | if (BB_OFFSET(p[lo]) < target) { | |
8474 | /* starts before the end, and finishes after | |
8475 | * the start, so they must overlap | |
8476 | */ | |
8477 | if (rv != -1 && BB_ACK(p[lo])) | |
8478 | rv = 1; | |
8479 | else | |
8480 | rv = -1; | |
8481 | *first_bad = BB_OFFSET(p[lo]); | |
8482 | *bad_sectors = BB_LEN(p[lo]); | |
8483 | } | |
8484 | lo--; | |
8485 | } | |
8486 | } | |
8487 | ||
8488 | if (read_seqretry(&bb->lock, seq)) | |
8489 | goto retry; | |
8490 | ||
8491 | return rv; | |
8492 | } | |
8493 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
8494 | ||
8495 | /* | |
8496 | * Add a range of bad blocks to the table. | |
8497 | * This might extend the table, or might contract it | |
8498 | * if two adjacent ranges can be merged. | |
8499 | * We binary-search to find the 'insertion' point, then | |
8500 | * decide how best to handle it. | |
8501 | */ | |
8502 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
8503 | int acknowledged) | |
8504 | { | |
8505 | u64 *p; | |
8506 | int lo, hi; | |
8507 | int rv = 1; | |
905b0297 | 8508 | unsigned long flags; |
2230dfe4 N |
8509 | |
8510 | if (bb->shift < 0) | |
8511 | /* badblocks are disabled */ | |
8512 | return 0; | |
8513 | ||
8514 | if (bb->shift) { | |
8515 | /* round the start down, and the end up */ | |
8516 | sector_t next = s + sectors; | |
8517 | s >>= bb->shift; | |
8518 | next += (1<<bb->shift) - 1; | |
8519 | next >>= bb->shift; | |
8520 | sectors = next - s; | |
8521 | } | |
8522 | ||
905b0297 | 8523 | write_seqlock_irqsave(&bb->lock, flags); |
2230dfe4 N |
8524 | |
8525 | p = bb->page; | |
8526 | lo = 0; | |
8527 | hi = bb->count; | |
8528 | /* Find the last range that starts at-or-before 's' */ | |
8529 | while (hi - lo > 1) { | |
8530 | int mid = (lo + hi) / 2; | |
8531 | sector_t a = BB_OFFSET(p[mid]); | |
8532 | if (a <= s) | |
8533 | lo = mid; | |
8534 | else | |
8535 | hi = mid; | |
8536 | } | |
8537 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8538 | hi = lo; | |
8539 | ||
8540 | if (hi > lo) { | |
8541 | /* we found a range that might merge with the start | |
8542 | * of our new range | |
8543 | */ | |
8544 | sector_t a = BB_OFFSET(p[lo]); | |
8545 | sector_t e = a + BB_LEN(p[lo]); | |
8546 | int ack = BB_ACK(p[lo]); | |
8547 | if (e >= s) { | |
8548 | /* Yes, we can merge with a previous range */ | |
8549 | if (s == a && s + sectors >= e) | |
8550 | /* new range covers old */ | |
8551 | ack = acknowledged; | |
8552 | else | |
8553 | ack = ack && acknowledged; | |
8554 | ||
8555 | if (e < s + sectors) | |
8556 | e = s + sectors; | |
8557 | if (e - a <= BB_MAX_LEN) { | |
8558 | p[lo] = BB_MAKE(a, e-a, ack); | |
8559 | s = e; | |
8560 | } else { | |
8561 | /* does not all fit in one range, | |
8562 | * make p[lo] maximal | |
8563 | */ | |
8564 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8565 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8566 | s = a + BB_MAX_LEN; | |
8567 | } | |
8568 | sectors = e - s; | |
8569 | } | |
8570 | } | |
8571 | if (sectors && hi < bb->count) { | |
8572 | /* 'hi' points to the first range that starts after 's'. | |
8573 | * Maybe we can merge with the start of that range */ | |
8574 | sector_t a = BB_OFFSET(p[hi]); | |
8575 | sector_t e = a + BB_LEN(p[hi]); | |
8576 | int ack = BB_ACK(p[hi]); | |
8577 | if (a <= s + sectors) { | |
8578 | /* merging is possible */ | |
8579 | if (e <= s + sectors) { | |
8580 | /* full overlap */ | |
8581 | e = s + sectors; | |
8582 | ack = acknowledged; | |
8583 | } else | |
8584 | ack = ack && acknowledged; | |
8585 | ||
8586 | a = s; | |
8587 | if (e - a <= BB_MAX_LEN) { | |
8588 | p[hi] = BB_MAKE(a, e-a, ack); | |
8589 | s = e; | |
8590 | } else { | |
8591 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8592 | s = a + BB_MAX_LEN; | |
8593 | } | |
8594 | sectors = e - s; | |
8595 | lo = hi; | |
8596 | hi++; | |
8597 | } | |
8598 | } | |
8599 | if (sectors == 0 && hi < bb->count) { | |
8600 | /* we might be able to combine lo and hi */ | |
8601 | /* Note: 's' is at the end of 'lo' */ | |
8602 | sector_t a = BB_OFFSET(p[hi]); | |
8603 | int lolen = BB_LEN(p[lo]); | |
8604 | int hilen = BB_LEN(p[hi]); | |
8605 | int newlen = lolen + hilen - (s - a); | |
8606 | if (s >= a && newlen < BB_MAX_LEN) { | |
8607 | /* yes, we can combine them */ | |
8608 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8609 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8610 | memmove(p + hi, p + hi + 1, | |
8611 | (bb->count - hi - 1) * 8); | |
8612 | bb->count--; | |
8613 | } | |
8614 | } | |
8615 | while (sectors) { | |
8616 | /* didn't merge (it all). | |
8617 | * Need to add a range just before 'hi' */ | |
8618 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8619 | /* No room for more */ | |
8620 | rv = 0; | |
8621 | break; | |
8622 | } else { | |
8623 | int this_sectors = sectors; | |
8624 | memmove(p + hi + 1, p + hi, | |
8625 | (bb->count - hi) * 8); | |
8626 | bb->count++; | |
8627 | ||
8628 | if (this_sectors > BB_MAX_LEN) | |
8629 | this_sectors = BB_MAX_LEN; | |
8630 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8631 | sectors -= this_sectors; | |
8632 | s += this_sectors; | |
8633 | } | |
8634 | } | |
8635 | ||
8636 | bb->changed = 1; | |
de393cde N |
8637 | if (!acknowledged) |
8638 | bb->unacked_exist = 1; | |
905b0297 | 8639 | write_sequnlock_irqrestore(&bb->lock, flags); |
2230dfe4 N |
8640 | |
8641 | return rv; | |
8642 | } | |
8643 | ||
3cb03002 | 8644 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8645 | int is_new) |
2230dfe4 | 8646 | { |
c6563a8c N |
8647 | int rv; |
8648 | if (is_new) | |
8649 | s += rdev->new_data_offset; | |
8650 | else | |
8651 | s += rdev->data_offset; | |
8652 | rv = md_set_badblocks(&rdev->badblocks, | |
8653 | s, sectors, 0); | |
2230dfe4 N |
8654 | if (rv) { |
8655 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8656 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 | 8657 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
55ce74d4 | 8658 | set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags); |
2230dfe4 N |
8659 | md_wakeup_thread(rdev->mddev->thread); |
8660 | } | |
8661 | return rv; | |
8662 | } | |
8663 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8664 | ||
8665 | /* | |
8666 | * Remove a range of bad blocks from the table. | |
8667 | * This may involve extending the table if we spilt a region, | |
8668 | * but it must not fail. So if the table becomes full, we just | |
8669 | * drop the remove request. | |
8670 | */ | |
8671 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8672 | { | |
8673 | u64 *p; | |
8674 | int lo, hi; | |
8675 | sector_t target = s + sectors; | |
8676 | int rv = 0; | |
8677 | ||
8678 | if (bb->shift > 0) { | |
8679 | /* When clearing we round the start up and the end down. | |
8680 | * This should not matter as the shift should align with | |
8681 | * the block size and no rounding should ever be needed. | |
8682 | * However it is better the think a block is bad when it | |
8683 | * isn't than to think a block is not bad when it is. | |
8684 | */ | |
8685 | s += (1<<bb->shift) - 1; | |
8686 | s >>= bb->shift; | |
8687 | target >>= bb->shift; | |
8688 | sectors = target - s; | |
8689 | } | |
8690 | ||
8691 | write_seqlock_irq(&bb->lock); | |
8692 | ||
8693 | p = bb->page; | |
8694 | lo = 0; | |
8695 | hi = bb->count; | |
8696 | /* Find the last range that starts before 'target' */ | |
8697 | while (hi - lo > 1) { | |
8698 | int mid = (lo + hi) / 2; | |
8699 | sector_t a = BB_OFFSET(p[mid]); | |
8700 | if (a < target) | |
8701 | lo = mid; | |
8702 | else | |
8703 | hi = mid; | |
8704 | } | |
8705 | if (hi > lo) { | |
8706 | /* p[lo] is the last range that could overlap the | |
8707 | * current range. Earlier ranges could also overlap, | |
8708 | * but only this one can overlap the end of the range. | |
8709 | */ | |
8710 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8711 | /* Partial overlap, leave the tail of this range */ | |
8712 | int ack = BB_ACK(p[lo]); | |
8713 | sector_t a = BB_OFFSET(p[lo]); | |
8714 | sector_t end = a + BB_LEN(p[lo]); | |
8715 | ||
8716 | if (a < s) { | |
8717 | /* we need to split this range */ | |
8718 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8b32bf5e | 8719 | rv = -ENOSPC; |
2230dfe4 N |
8720 | goto out; |
8721 | } | |
8722 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8723 | bb->count++; | |
8724 | p[lo] = BB_MAKE(a, s-a, ack); | |
8725 | lo++; | |
8726 | } | |
8727 | p[lo] = BB_MAKE(target, end - target, ack); | |
8728 | /* there is no longer an overlap */ | |
8729 | hi = lo; | |
8730 | lo--; | |
8731 | } | |
8732 | while (lo >= 0 && | |
8733 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8734 | /* This range does overlap */ | |
8735 | if (BB_OFFSET(p[lo]) < s) { | |
8736 | /* Keep the early parts of this range. */ | |
8737 | int ack = BB_ACK(p[lo]); | |
8738 | sector_t start = BB_OFFSET(p[lo]); | |
8739 | p[lo] = BB_MAKE(start, s - start, ack); | |
8740 | /* now low doesn't overlap, so.. */ | |
8741 | break; | |
8742 | } | |
8743 | lo--; | |
8744 | } | |
8745 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8746 | * anything between needs to be discarded | |
8747 | */ | |
8748 | if (hi - lo > 1) { | |
8749 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8750 | bb->count -= (hi - lo - 1); | |
8751 | } | |
8752 | } | |
8753 | ||
8754 | bb->changed = 1; | |
8755 | out: | |
8756 | write_sequnlock_irq(&bb->lock); | |
8757 | return rv; | |
8758 | } | |
8759 | ||
c6563a8c N |
8760 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8761 | int is_new) | |
2230dfe4 | 8762 | { |
c6563a8c N |
8763 | if (is_new) |
8764 | s += rdev->new_data_offset; | |
8765 | else | |
8766 | s += rdev->data_offset; | |
2230dfe4 | 8767 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8768 | s, sectors); |
2230dfe4 N |
8769 | } |
8770 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8771 | ||
8772 | /* | |
8773 | * Acknowledge all bad blocks in a list. | |
8774 | * This only succeeds if ->changed is clear. It is used by | |
8775 | * in-kernel metadata updates | |
8776 | */ | |
8777 | void md_ack_all_badblocks(struct badblocks *bb) | |
8778 | { | |
8779 | if (bb->page == NULL || bb->changed) | |
8780 | /* no point even trying */ | |
8781 | return; | |
8782 | write_seqlock_irq(&bb->lock); | |
8783 | ||
ecb178bb | 8784 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8785 | u64 *p = bb->page; |
8786 | int i; | |
8787 | for (i = 0; i < bb->count ; i++) { | |
8788 | if (!BB_ACK(p[i])) { | |
8789 | sector_t start = BB_OFFSET(p[i]); | |
8790 | int len = BB_LEN(p[i]); | |
8791 | p[i] = BB_MAKE(start, len, 1); | |
8792 | } | |
8793 | } | |
de393cde | 8794 | bb->unacked_exist = 0; |
2230dfe4 N |
8795 | } |
8796 | write_sequnlock_irq(&bb->lock); | |
8797 | } | |
8798 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8799 | ||
16c791a5 N |
8800 | /* sysfs access to bad-blocks list. |
8801 | * We present two files. | |
8802 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8803 | * are recorded as bad. The list is truncated to fit within | |
8804 | * the one-page limit of sysfs. | |
8805 | * Writing "sector length" to this file adds an acknowledged | |
8806 | * bad block list. | |
8807 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8808 | * been acknowledged. Writing to this file adds bad blocks | |
8809 | * without acknowledging them. This is largely for testing. | |
8810 | */ | |
8811 | ||
8812 | static ssize_t | |
8813 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8814 | { | |
8815 | size_t len; | |
8816 | int i; | |
8817 | u64 *p = bb->page; | |
8818 | unsigned seq; | |
8819 | ||
8820 | if (bb->shift < 0) | |
8821 | return 0; | |
8822 | ||
8823 | retry: | |
8824 | seq = read_seqbegin(&bb->lock); | |
8825 | ||
8826 | len = 0; | |
8827 | i = 0; | |
8828 | ||
8829 | while (len < PAGE_SIZE && i < bb->count) { | |
8830 | sector_t s = BB_OFFSET(p[i]); | |
8831 | unsigned int length = BB_LEN(p[i]); | |
8832 | int ack = BB_ACK(p[i]); | |
8833 | i++; | |
8834 | ||
8835 | if (unack && ack) | |
8836 | continue; | |
8837 | ||
8838 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8839 | (unsigned long long)s << bb->shift, | |
8840 | length << bb->shift); | |
8841 | } | |
de393cde N |
8842 | if (unack && len == 0) |
8843 | bb->unacked_exist = 0; | |
16c791a5 N |
8844 | |
8845 | if (read_seqretry(&bb->lock, seq)) | |
8846 | goto retry; | |
8847 | ||
8848 | return len; | |
8849 | } | |
8850 | ||
8851 | #define DO_DEBUG 1 | |
8852 | ||
8853 | static ssize_t | |
8854 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8855 | { | |
8856 | unsigned long long sector; | |
8857 | int length; | |
8858 | char newline; | |
8859 | #ifdef DO_DEBUG | |
8860 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8861 | * Normally only a successful write may clear a badblock | |
8862 | */ | |
8863 | int clear = 0; | |
8864 | if (page[0] == '-') { | |
8865 | clear = 1; | |
8866 | page++; | |
8867 | } | |
8868 | #endif /* DO_DEBUG */ | |
8869 | ||
8870 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8871 | case 3: | |
8872 | if (newline != '\n') | |
8873 | return -EINVAL; | |
8874 | case 2: | |
8875 | if (length <= 0) | |
8876 | return -EINVAL; | |
8877 | break; | |
8878 | default: | |
8879 | return -EINVAL; | |
8880 | } | |
8881 | ||
8882 | #ifdef DO_DEBUG | |
8883 | if (clear) { | |
8884 | md_clear_badblocks(bb, sector, length); | |
8885 | return len; | |
8886 | } | |
8887 | #endif /* DO_DEBUG */ | |
8888 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8889 | return len; | |
8890 | else | |
8891 | return -ENOSPC; | |
8892 | } | |
8893 | ||
75c96f85 AB |
8894 | static int md_notify_reboot(struct notifier_block *this, |
8895 | unsigned long code, void *x) | |
1da177e4 LT |
8896 | { |
8897 | struct list_head *tmp; | |
fd01b88c | 8898 | struct mddev *mddev; |
2dba6a91 | 8899 | int need_delay = 0; |
1da177e4 | 8900 | |
c744a65c N |
8901 | for_each_mddev(mddev, tmp) { |
8902 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8903 | if (mddev->pers) |
8904 | __md_stop_writes(mddev); | |
0f62fb22 N |
8905 | if (mddev->persistent) |
8906 | mddev->safemode = 2; | |
c744a65c | 8907 | mddev_unlock(mddev); |
2dba6a91 | 8908 | } |
c744a65c | 8909 | need_delay = 1; |
1da177e4 | 8910 | } |
c744a65c N |
8911 | /* |
8912 | * certain more exotic SCSI devices are known to be | |
8913 | * volatile wrt too early system reboots. While the | |
8914 | * right place to handle this issue is the given | |
8915 | * driver, we do want to have a safe RAID driver ... | |
8916 | */ | |
8917 | if (need_delay) | |
8918 | mdelay(1000*1); | |
8919 | ||
1da177e4 LT |
8920 | return NOTIFY_DONE; |
8921 | } | |
8922 | ||
75c96f85 | 8923 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8924 | .notifier_call = md_notify_reboot, |
8925 | .next = NULL, | |
8926 | .priority = INT_MAX, /* before any real devices */ | |
8927 | }; | |
8928 | ||
8929 | static void md_geninit(void) | |
8930 | { | |
36a4e1fe | 8931 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8932 | |
c7705f34 | 8933 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8934 | } |
8935 | ||
75c96f85 | 8936 | static int __init md_init(void) |
1da177e4 | 8937 | { |
e804ac78 TH |
8938 | int ret = -ENOMEM; |
8939 | ||
ada609ee | 8940 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8941 | if (!md_wq) |
8942 | goto err_wq; | |
8943 | ||
8944 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8945 | if (!md_misc_wq) | |
8946 | goto err_misc_wq; | |
8947 | ||
8948 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8949 | goto err_md; | |
8950 | ||
8951 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8952 | goto err_mdp; | |
8953 | mdp_major = ret; | |
8954 | ||
af5628f0 | 8955 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
8956 | md_probe, NULL, NULL); |
8957 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8958 | md_probe, NULL, NULL); |
8959 | ||
1da177e4 | 8960 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8961 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8962 | |
8963 | md_geninit(); | |
d710e138 | 8964 | return 0; |
1da177e4 | 8965 | |
e804ac78 TH |
8966 | err_mdp: |
8967 | unregister_blkdev(MD_MAJOR, "md"); | |
8968 | err_md: | |
8969 | destroy_workqueue(md_misc_wq); | |
8970 | err_misc_wq: | |
8971 | destroy_workqueue(md_wq); | |
8972 | err_wq: | |
8973 | return ret; | |
8974 | } | |
1da177e4 | 8975 | |
70bcecdb | 8976 | static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) |
1d7e3e96 | 8977 | { |
70bcecdb GR |
8978 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
8979 | struct md_rdev *rdev2; | |
8980 | int role, ret; | |
8981 | char b[BDEVNAME_SIZE]; | |
1d7e3e96 | 8982 | |
70bcecdb GR |
8983 | /* Check for change of roles in the active devices */ |
8984 | rdev_for_each(rdev2, mddev) { | |
8985 | if (test_bit(Faulty, &rdev2->flags)) | |
8986 | continue; | |
8987 | ||
8988 | /* Check if the roles changed */ | |
8989 | role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); | |
dbb64f86 GR |
8990 | |
8991 | if (test_bit(Candidate, &rdev2->flags)) { | |
8992 | if (role == 0xfffe) { | |
8993 | pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); | |
8994 | md_kick_rdev_from_array(rdev2); | |
8995 | continue; | |
8996 | } | |
8997 | else | |
8998 | clear_bit(Candidate, &rdev2->flags); | |
8999 | } | |
9000 | ||
70bcecdb GR |
9001 | if (role != rdev2->raid_disk) { |
9002 | /* got activated */ | |
9003 | if (rdev2->raid_disk == -1 && role != 0xffff) { | |
9004 | rdev2->saved_raid_disk = role; | |
9005 | ret = remove_and_add_spares(mddev, rdev2); | |
9006 | pr_info("Activated spare: %s\n", | |
9007 | bdevname(rdev2->bdev,b)); | |
9008 | continue; | |
9009 | } | |
9010 | /* device faulty | |
9011 | * We just want to do the minimum to mark the disk | |
9012 | * as faulty. The recovery is performed by the | |
9013 | * one who initiated the error. | |
9014 | */ | |
9015 | if ((role == 0xfffe) || (role == 0xfffd)) { | |
9016 | md_error(mddev, rdev2); | |
9017 | clear_bit(Blocked, &rdev2->flags); | |
9018 | } | |
9019 | } | |
1d7e3e96 | 9020 | } |
70bcecdb | 9021 | |
28c1b9fd GR |
9022 | if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) |
9023 | update_raid_disks(mddev, le32_to_cpu(sb->raid_disks)); | |
70bcecdb GR |
9024 | |
9025 | /* Finally set the event to be up to date */ | |
9026 | mddev->events = le64_to_cpu(sb->events); | |
9027 | } | |
9028 | ||
9029 | static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) | |
9030 | { | |
9031 | int err; | |
9032 | struct page *swapout = rdev->sb_page; | |
9033 | struct mdp_superblock_1 *sb; | |
9034 | ||
9035 | /* Store the sb page of the rdev in the swapout temporary | |
9036 | * variable in case we err in the future | |
9037 | */ | |
9038 | rdev->sb_page = NULL; | |
9039 | alloc_disk_sb(rdev); | |
9040 | ClearPageUptodate(rdev->sb_page); | |
9041 | rdev->sb_loaded = 0; | |
9042 | err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version); | |
9043 | ||
9044 | if (err < 0) { | |
9045 | pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", | |
9046 | __func__, __LINE__, rdev->desc_nr, err); | |
9047 | put_page(rdev->sb_page); | |
9048 | rdev->sb_page = swapout; | |
9049 | rdev->sb_loaded = 1; | |
9050 | return err; | |
1d7e3e96 GR |
9051 | } |
9052 | ||
70bcecdb GR |
9053 | sb = page_address(rdev->sb_page); |
9054 | /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET | |
9055 | * is not set | |
9056 | */ | |
9057 | ||
9058 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) | |
9059 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
9060 | ||
9061 | /* The other node finished recovery, call spare_active to set | |
9062 | * device In_sync and mddev->degraded | |
9063 | */ | |
9064 | if (rdev->recovery_offset == MaxSector && | |
9065 | !test_bit(In_sync, &rdev->flags) && | |
9066 | mddev->pers->spare_active(mddev)) | |
9067 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
9068 | ||
9069 | put_page(swapout); | |
9070 | return 0; | |
9071 | } | |
9072 | ||
9073 | void md_reload_sb(struct mddev *mddev, int nr) | |
9074 | { | |
9075 | struct md_rdev *rdev; | |
9076 | int err; | |
9077 | ||
9078 | /* Find the rdev */ | |
9079 | rdev_for_each_rcu(rdev, mddev) { | |
9080 | if (rdev->desc_nr == nr) | |
9081 | break; | |
9082 | } | |
9083 | ||
9084 | if (!rdev || rdev->desc_nr != nr) { | |
9085 | pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); | |
9086 | return; | |
9087 | } | |
9088 | ||
9089 | err = read_rdev(mddev, rdev); | |
9090 | if (err < 0) | |
9091 | return; | |
9092 | ||
9093 | check_sb_changes(mddev, rdev); | |
9094 | ||
9095 | /* Read all rdev's to update recovery_offset */ | |
9096 | rdev_for_each_rcu(rdev, mddev) | |
9097 | read_rdev(mddev, rdev); | |
1d7e3e96 GR |
9098 | } |
9099 | EXPORT_SYMBOL(md_reload_sb); | |
9100 | ||
1da177e4 LT |
9101 | #ifndef MODULE |
9102 | ||
9103 | /* | |
9104 | * Searches all registered partitions for autorun RAID arrays | |
9105 | * at boot time. | |
9106 | */ | |
4d936ec1 ME |
9107 | |
9108 | static LIST_HEAD(all_detected_devices); | |
9109 | struct detected_devices_node { | |
9110 | struct list_head list; | |
9111 | dev_t dev; | |
9112 | }; | |
1da177e4 LT |
9113 | |
9114 | void md_autodetect_dev(dev_t dev) | |
9115 | { | |
4d936ec1 ME |
9116 | struct detected_devices_node *node_detected_dev; |
9117 | ||
9118 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
9119 | if (node_detected_dev) { | |
9120 | node_detected_dev->dev = dev; | |
9121 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
9122 | } else { | |
9123 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
9124 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
9125 | } | |
1da177e4 LT |
9126 | } |
9127 | ||
1da177e4 LT |
9128 | static void autostart_arrays(int part) |
9129 | { | |
3cb03002 | 9130 | struct md_rdev *rdev; |
4d936ec1 ME |
9131 | struct detected_devices_node *node_detected_dev; |
9132 | dev_t dev; | |
9133 | int i_scanned, i_passed; | |
1da177e4 | 9134 | |
4d936ec1 ME |
9135 | i_scanned = 0; |
9136 | i_passed = 0; | |
1da177e4 | 9137 | |
4d936ec1 | 9138 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 9139 | |
4d936ec1 ME |
9140 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
9141 | i_scanned++; | |
9142 | node_detected_dev = list_entry(all_detected_devices.next, | |
9143 | struct detected_devices_node, list); | |
9144 | list_del(&node_detected_dev->list); | |
9145 | dev = node_detected_dev->dev; | |
9146 | kfree(node_detected_dev); | |
df968c4e | 9147 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
9148 | if (IS_ERR(rdev)) |
9149 | continue; | |
9150 | ||
403df478 | 9151 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 9152 | continue; |
403df478 | 9153 | |
d0fae18f | 9154 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 9155 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 9156 | i_passed++; |
1da177e4 | 9157 | } |
4d936ec1 ME |
9158 | |
9159 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
9160 | i_scanned, i_passed); | |
1da177e4 LT |
9161 | |
9162 | autorun_devices(part); | |
9163 | } | |
9164 | ||
fdee8ae4 | 9165 | #endif /* !MODULE */ |
1da177e4 LT |
9166 | |
9167 | static __exit void md_exit(void) | |
9168 | { | |
fd01b88c | 9169 | struct mddev *mddev; |
1da177e4 | 9170 | struct list_head *tmp; |
e2f23b60 | 9171 | int delay = 1; |
8ab5e4c1 | 9172 | |
af5628f0 | 9173 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 9174 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 9175 | |
3dbd8c2e | 9176 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
9177 | unregister_blkdev(mdp_major, "mdp"); |
9178 | unregister_reboot_notifier(&md_notifier); | |
9179 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
9180 | |
9181 | /* We cannot unload the modules while some process is | |
9182 | * waiting for us in select() or poll() - wake them up | |
9183 | */ | |
9184 | md_unloading = 1; | |
9185 | while (waitqueue_active(&md_event_waiters)) { | |
9186 | /* not safe to leave yet */ | |
9187 | wake_up(&md_event_waiters); | |
9188 | msleep(delay); | |
9189 | delay += delay; | |
9190 | } | |
1da177e4 | 9191 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 9192 | |
29ac4aa3 | 9193 | for_each_mddev(mddev, tmp) { |
1da177e4 | 9194 | export_array(mddev); |
d3374825 | 9195 | mddev->hold_active = 0; |
1da177e4 | 9196 | } |
e804ac78 TH |
9197 | destroy_workqueue(md_misc_wq); |
9198 | destroy_workqueue(md_wq); | |
1da177e4 LT |
9199 | } |
9200 | ||
685784aa | 9201 | subsys_initcall(md_init); |
1da177e4 LT |
9202 | module_exit(md_exit) |
9203 | ||
f91de92e N |
9204 | static int get_ro(char *buffer, struct kernel_param *kp) |
9205 | { | |
9206 | return sprintf(buffer, "%d", start_readonly); | |
9207 | } | |
9208 | static int set_ro(const char *val, struct kernel_param *kp) | |
9209 | { | |
4c9309c0 | 9210 | return kstrtouint(val, 10, (unsigned int *)&start_readonly); |
f91de92e N |
9211 | } |
9212 | ||
80ca3a44 N |
9213 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
9214 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 9215 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 9216 | |
1da177e4 | 9217 | MODULE_LICENSE("GPL"); |
0efb9e61 | 9218 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 9219 | MODULE_ALIAS("md"); |
72008652 | 9220 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |