Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
f72ffdd6 | 3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar |
1da177e4 LT |
4 | |
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
fc974ee2 | 37 | #include <linux/badblocks.h> |
1da177e4 | 38 | #include <linux/sysctl.h> |
bff61975 | 39 | #include <linux/seq_file.h> |
ff01bb48 | 40 | #include <linux/fs.h> |
d7603b7e | 41 | #include <linux/poll.h> |
16f17b39 | 42 | #include <linux/ctype.h> |
e7d2860b | 43 | #include <linux/string.h> |
fb4d8c76 N |
44 | #include <linux/hdreg.h> |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/random.h> | |
056075c7 | 47 | #include <linux/module.h> |
fb4d8c76 | 48 | #include <linux/reboot.h> |
32a7627c | 49 | #include <linux/file.h> |
aa98aa31 | 50 | #include <linux/compat.h> |
25570727 | 51 | #include <linux/delay.h> |
bff61975 N |
52 | #include <linux/raid/md_p.h> |
53 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 54 | #include <linux/slab.h> |
43b2e5d8 | 55 | #include "md.h" |
ef740c37 | 56 | #include "bitmap.h" |
edb39c9d | 57 | #include "md-cluster.h" |
1da177e4 | 58 | |
1da177e4 | 59 | #ifndef MODULE |
d710e138 | 60 | static void autostart_arrays(int part); |
1da177e4 LT |
61 | #endif |
62 | ||
01f96c0a N |
63 | /* pers_list is a list of registered personalities protected |
64 | * by pers_lock. | |
65 | * pers_lock does extra service to protect accesses to | |
66 | * mddev->thread when the mutex cannot be held. | |
67 | */ | |
2604b703 | 68 | static LIST_HEAD(pers_list); |
1da177e4 LT |
69 | static DEFINE_SPINLOCK(pers_lock); |
70 | ||
edb39c9d | 71 | struct md_cluster_operations *md_cluster_ops; |
589a1c49 | 72 | EXPORT_SYMBOL(md_cluster_ops); |
edb39c9d GR |
73 | struct module *md_cluster_mod; |
74 | EXPORT_SYMBOL(md_cluster_mod); | |
75 | ||
90b08710 | 76 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
77 | static struct workqueue_struct *md_wq; |
78 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 79 | |
746d3207 N |
80 | static int remove_and_add_spares(struct mddev *mddev, |
81 | struct md_rdev *this); | |
5aa61f42 | 82 | static void mddev_detach(struct mddev *mddev); |
746d3207 | 83 | |
1e50915f RB |
84 | /* |
85 | * Default number of read corrections we'll attempt on an rdev | |
86 | * before ejecting it from the array. We divide the read error | |
87 | * count by 2 for every hour elapsed between read errors. | |
88 | */ | |
89 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
90 | /* |
91 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
92 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
93 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 94 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
95 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
96 | * speed limit - in case reconstruction slows down your system despite | |
97 | * idle IO detection. | |
98 | * | |
99 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 100 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
101 | */ |
102 | ||
103 | static int sysctl_speed_limit_min = 1000; | |
104 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 105 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
106 | { |
107 | return mddev->sync_speed_min ? | |
108 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
109 | } | |
110 | ||
fd01b88c | 111 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
112 | { |
113 | return mddev->sync_speed_max ? | |
114 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
115 | } | |
1da177e4 LT |
116 | |
117 | static struct ctl_table_header *raid_table_header; | |
118 | ||
82592c38 | 119 | static struct ctl_table raid_table[] = { |
1da177e4 | 120 | { |
1da177e4 LT |
121 | .procname = "speed_limit_min", |
122 | .data = &sysctl_speed_limit_min, | |
123 | .maxlen = sizeof(int), | |
80ca3a44 | 124 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 125 | .proc_handler = proc_dointvec, |
1da177e4 LT |
126 | }, |
127 | { | |
1da177e4 LT |
128 | .procname = "speed_limit_max", |
129 | .data = &sysctl_speed_limit_max, | |
130 | .maxlen = sizeof(int), | |
80ca3a44 | 131 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 132 | .proc_handler = proc_dointvec, |
1da177e4 | 133 | }, |
894d2491 | 134 | { } |
1da177e4 LT |
135 | }; |
136 | ||
82592c38 | 137 | static struct ctl_table raid_dir_table[] = { |
1da177e4 | 138 | { |
1da177e4 LT |
139 | .procname = "raid", |
140 | .maxlen = 0, | |
80ca3a44 | 141 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
142 | .child = raid_table, |
143 | }, | |
894d2491 | 144 | { } |
1da177e4 LT |
145 | }; |
146 | ||
82592c38 | 147 | static struct ctl_table raid_root_table[] = { |
1da177e4 | 148 | { |
1da177e4 LT |
149 | .procname = "dev", |
150 | .maxlen = 0, | |
151 | .mode = 0555, | |
152 | .child = raid_dir_table, | |
153 | }, | |
894d2491 | 154 | { } |
1da177e4 LT |
155 | }; |
156 | ||
83d5cde4 | 157 | static const struct block_device_operations md_fops; |
1da177e4 | 158 | |
f91de92e N |
159 | static int start_readonly; |
160 | ||
a167f663 N |
161 | /* bio_clone_mddev |
162 | * like bio_clone, but with a local bio set | |
163 | */ | |
164 | ||
a167f663 | 165 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 166 | struct mddev *mddev) |
a167f663 N |
167 | { |
168 | struct bio *b; | |
a167f663 N |
169 | |
170 | if (!mddev || !mddev->bio_set) | |
171 | return bio_alloc(gfp_mask, nr_iovecs); | |
172 | ||
395c72a7 | 173 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
174 | if (!b) |
175 | return NULL; | |
a167f663 N |
176 | return b; |
177 | } | |
178 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
179 | ||
180 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 181 | struct mddev *mddev) |
a167f663 | 182 | { |
a167f663 N |
183 | if (!mddev || !mddev->bio_set) |
184 | return bio_clone(bio, gfp_mask); | |
185 | ||
bf800ef1 | 186 | return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
a167f663 N |
187 | } |
188 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
189 | ||
d7603b7e N |
190 | /* |
191 | * We have a system wide 'event count' that is incremented | |
192 | * on any 'interesting' event, and readers of /proc/mdstat | |
193 | * can use 'poll' or 'select' to find out when the event | |
194 | * count increases. | |
195 | * | |
196 | * Events are: | |
197 | * start array, stop array, error, add device, remove device, | |
198 | * start build, activate spare | |
199 | */ | |
2989ddbd | 200 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 201 | static atomic_t md_event_count; |
fd01b88c | 202 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
203 | { |
204 | atomic_inc(&md_event_count); | |
205 | wake_up(&md_event_waiters); | |
206 | } | |
29269553 | 207 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 208 | |
1da177e4 LT |
209 | /* |
210 | * Enables to iterate over all existing md arrays | |
211 | * all_mddevs_lock protects this list. | |
212 | */ | |
213 | static LIST_HEAD(all_mddevs); | |
214 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
215 | ||
1da177e4 LT |
216 | /* |
217 | * iterates through all used mddevs in the system. | |
218 | * We take care to grab the all_mddevs_lock whenever navigating | |
219 | * the list, and to always hold a refcount when unlocked. | |
220 | * Any code which breaks out of this loop while own | |
221 | * a reference to the current mddev and must mddev_put it. | |
222 | */ | |
fd01b88c | 223 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 | 224 | \ |
f72ffdd6 | 225 | for (({ spin_lock(&all_mddevs_lock); \ |
fd01b88c N |
226 | _tmp = all_mddevs.next; \ |
227 | _mddev = NULL;}); \ | |
228 | ({ if (_tmp != &all_mddevs) \ | |
229 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 230 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
231 | if (_mddev) mddev_put(_mddev); \ |
232 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
233 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 234 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 235 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
236 | ) |
237 | ||
409c57f3 N |
238 | /* Rather than calling directly into the personality make_request function, |
239 | * IO requests come here first so that we can check if the device is | |
240 | * being suspended pending a reconfiguration. | |
241 | * We hold a refcount over the call to ->make_request. By the time that | |
242 | * call has finished, the bio has been linked into some internal structure | |
243 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
244 | */ | |
dece1635 | 245 | static blk_qc_t md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 246 | { |
49077326 | 247 | const int rw = bio_data_dir(bio); |
fd01b88c | 248 | struct mddev *mddev = q->queuedata; |
e91ece55 | 249 | unsigned int sectors; |
74672d06 | 250 | int cpu; |
49077326 | 251 | |
54efd50b KO |
252 | blk_queue_split(q, &bio, q->bio_split); |
253 | ||
274d8cbd | 254 | if (mddev == NULL || mddev->pers == NULL) { |
409c57f3 | 255 | bio_io_error(bio); |
dece1635 | 256 | return BLK_QC_T_NONE; |
409c57f3 | 257 | } |
bbfa57c0 | 258 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
4246a0b6 CH |
259 | if (bio_sectors(bio) != 0) |
260 | bio->bi_error = -EROFS; | |
261 | bio_endio(bio); | |
dece1635 | 262 | return BLK_QC_T_NONE; |
bbfa57c0 | 263 | } |
0ca69886 | 264 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 265 | rcu_read_lock(); |
e9c7469b | 266 | if (mddev->suspended) { |
409c57f3 N |
267 | DEFINE_WAIT(__wait); |
268 | for (;;) { | |
269 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
270 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 271 | if (!mddev->suspended) |
409c57f3 N |
272 | break; |
273 | rcu_read_unlock(); | |
274 | schedule(); | |
275 | rcu_read_lock(); | |
276 | } | |
277 | finish_wait(&mddev->sb_wait, &__wait); | |
278 | } | |
279 | atomic_inc(&mddev->active_io); | |
280 | rcu_read_unlock(); | |
49077326 | 281 | |
e91ece55 CM |
282 | /* |
283 | * save the sectors now since our bio can | |
284 | * go away inside make_request | |
285 | */ | |
286 | sectors = bio_sectors(bio); | |
9c573de3 SL |
287 | /* bio could be mergeable after passing to underlayer */ |
288 | bio->bi_rw &= ~REQ_NOMERGE; | |
5a7bbad2 | 289 | mddev->pers->make_request(mddev, bio); |
49077326 | 290 | |
74672d06 GZ |
291 | cpu = part_stat_lock(); |
292 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
293 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); | |
294 | part_stat_unlock(); | |
49077326 | 295 | |
409c57f3 N |
296 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
297 | wake_up(&mddev->sb_wait); | |
dece1635 JA |
298 | |
299 | return BLK_QC_T_NONE; | |
409c57f3 N |
300 | } |
301 | ||
9e35b99c N |
302 | /* mddev_suspend makes sure no new requests are submitted |
303 | * to the device, and that any requests that have been submitted | |
304 | * are completely handled. | |
afa0f557 N |
305 | * Once mddev_detach() is called and completes, the module will be |
306 | * completely unused. | |
9e35b99c | 307 | */ |
fd01b88c | 308 | void mddev_suspend(struct mddev *mddev) |
409c57f3 | 309 | { |
092398dc | 310 | WARN_ON_ONCE(mddev->thread && current == mddev->thread->tsk); |
0dc10e50 MP |
311 | if (mddev->suspended++) |
312 | return; | |
409c57f3 N |
313 | synchronize_rcu(); |
314 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
315 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
316 | |
317 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 318 | } |
390ee602 | 319 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 320 | |
fd01b88c | 321 | void mddev_resume(struct mddev *mddev) |
409c57f3 | 322 | { |
0dc10e50 MP |
323 | if (--mddev->suspended) |
324 | return; | |
409c57f3 N |
325 | wake_up(&mddev->sb_wait); |
326 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 327 | |
47525e59 | 328 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
329 | md_wakeup_thread(mddev->thread); |
330 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 331 | } |
390ee602 | 332 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 333 | |
fd01b88c | 334 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 | 335 | { |
5c675f83 N |
336 | struct md_personality *pers = mddev->pers; |
337 | int ret = 0; | |
338 | ||
339 | rcu_read_lock(); | |
340 | if (mddev->suspended) | |
341 | ret = 1; | |
342 | else if (pers && pers->congested) | |
343 | ret = pers->congested(mddev, bits); | |
344 | rcu_read_unlock(); | |
345 | return ret; | |
346 | } | |
347 | EXPORT_SYMBOL_GPL(mddev_congested); | |
348 | static int md_congested(void *data, int bits) | |
349 | { | |
350 | struct mddev *mddev = data; | |
351 | return mddev_congested(mddev, bits); | |
3fa841d7 | 352 | } |
3fa841d7 | 353 | |
a2826aa9 | 354 | /* |
e9c7469b | 355 | * Generic flush handling for md |
a2826aa9 N |
356 | */ |
357 | ||
4246a0b6 | 358 | static void md_end_flush(struct bio *bio) |
a2826aa9 | 359 | { |
3cb03002 | 360 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 361 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
362 | |
363 | rdev_dec_pending(rdev, mddev); | |
364 | ||
365 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 366 | /* The pre-request flush has finished */ |
e804ac78 | 367 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
368 | } |
369 | bio_put(bio); | |
370 | } | |
371 | ||
a7a07e69 N |
372 | static void md_submit_flush_data(struct work_struct *ws); |
373 | ||
a035fc3e | 374 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 375 | { |
fd01b88c | 376 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 377 | struct md_rdev *rdev; |
a2826aa9 | 378 | |
a7a07e69 N |
379 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
380 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 381 | rcu_read_lock(); |
dafb20fa | 382 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
383 | if (rdev->raid_disk >= 0 && |
384 | !test_bit(Faulty, &rdev->flags)) { | |
385 | /* Take two references, one is dropped | |
386 | * when request finishes, one after | |
387 | * we reclaim rcu_read_lock | |
388 | */ | |
389 | struct bio *bi; | |
390 | atomic_inc(&rdev->nr_pending); | |
391 | atomic_inc(&rdev->nr_pending); | |
392 | rcu_read_unlock(); | |
b5e1b8ce | 393 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 394 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
395 | bi->bi_private = rdev; |
396 | bi->bi_bdev = rdev->bdev; | |
397 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 398 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
399 | rcu_read_lock(); |
400 | rdev_dec_pending(rdev, mddev); | |
401 | } | |
402 | rcu_read_unlock(); | |
a7a07e69 N |
403 | if (atomic_dec_and_test(&mddev->flush_pending)) |
404 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
405 | } |
406 | ||
e9c7469b | 407 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 408 | { |
fd01b88c | 409 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 410 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 411 | |
4f024f37 | 412 | if (bio->bi_iter.bi_size == 0) |
a2826aa9 | 413 | /* an empty barrier - all done */ |
4246a0b6 | 414 | bio_endio(bio); |
a2826aa9 | 415 | else { |
e9c7469b | 416 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 417 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 418 | } |
2b74e12e N |
419 | |
420 | mddev->flush_bio = NULL; | |
421 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
422 | } |
423 | ||
fd01b88c | 424 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 | 425 | { |
85572d7c | 426 | spin_lock_irq(&mddev->lock); |
a2826aa9 | 427 | wait_event_lock_irq(mddev->sb_wait, |
e9c7469b | 428 | !mddev->flush_bio, |
85572d7c | 429 | mddev->lock); |
e9c7469b | 430 | mddev->flush_bio = bio; |
85572d7c | 431 | spin_unlock_irq(&mddev->lock); |
a2826aa9 | 432 | |
a035fc3e N |
433 | INIT_WORK(&mddev->flush_work, submit_flushes); |
434 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 435 | } |
e9c7469b | 436 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 437 | |
74018dc3 | 438 | void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
97658cdd | 439 | { |
9cbb1750 N |
440 | struct mddev *mddev = cb->data; |
441 | md_wakeup_thread(mddev->thread); | |
442 | kfree(cb); | |
97658cdd | 443 | } |
9cbb1750 | 444 | EXPORT_SYMBOL(md_unplug); |
2ac87401 | 445 | |
fd01b88c | 446 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
447 | { |
448 | atomic_inc(&mddev->active); | |
449 | return mddev; | |
450 | } | |
451 | ||
5fd3a17e | 452 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 453 | |
fd01b88c | 454 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 455 | { |
a167f663 N |
456 | struct bio_set *bs = NULL; |
457 | ||
1da177e4 LT |
458 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
459 | return; | |
d3374825 | 460 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
461 | mddev->ctime == 0 && !mddev->hold_active) { |
462 | /* Array is not configured at all, and not held active, | |
463 | * so destroy it */ | |
af8a2434 | 464 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
465 | bs = mddev->bio_set; |
466 | mddev->bio_set = NULL; | |
d3374825 | 467 | if (mddev->gendisk) { |
e804ac78 TH |
468 | /* We did a probe so need to clean up. Call |
469 | * queue_work inside the spinlock so that | |
470 | * flush_workqueue() after mddev_find will | |
471 | * succeed in waiting for the work to be done. | |
d3374825 N |
472 | */ |
473 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 474 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
475 | } else |
476 | kfree(mddev); | |
477 | } | |
478 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
479 | if (bs) |
480 | bioset_free(bs); | |
1da177e4 LT |
481 | } |
482 | ||
25b2edfa SL |
483 | static void md_safemode_timeout(unsigned long data); |
484 | ||
fd01b88c | 485 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
486 | { |
487 | mutex_init(&mddev->open_mutex); | |
488 | mutex_init(&mddev->reconfig_mutex); | |
489 | mutex_init(&mddev->bitmap_info.mutex); | |
490 | INIT_LIST_HEAD(&mddev->disks); | |
491 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
25b2edfa SL |
492 | setup_timer(&mddev->safemode_timer, md_safemode_timeout, |
493 | (unsigned long) mddev); | |
fafd7fb0 N |
494 | atomic_set(&mddev->active, 1); |
495 | atomic_set(&mddev->openers, 0); | |
496 | atomic_set(&mddev->active_io, 0); | |
85572d7c | 497 | spin_lock_init(&mddev->lock); |
fafd7fb0 N |
498 | atomic_set(&mddev->flush_pending, 0); |
499 | init_waitqueue_head(&mddev->sb_wait); | |
500 | init_waitqueue_head(&mddev->recovery_wait); | |
501 | mddev->reshape_position = MaxSector; | |
2c810cdd | 502 | mddev->reshape_backwards = 0; |
c4a39551 | 503 | mddev->last_sync_action = "none"; |
fafd7fb0 N |
504 | mddev->resync_min = 0; |
505 | mddev->resync_max = MaxSector; | |
506 | mddev->level = LEVEL_NONE; | |
507 | } | |
390ee602 | 508 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 509 | |
f72ffdd6 | 510 | static struct mddev *mddev_find(dev_t unit) |
1da177e4 | 511 | { |
fd01b88c | 512 | struct mddev *mddev, *new = NULL; |
1da177e4 | 513 | |
8f5f02c4 N |
514 | if (unit && MAJOR(unit) != MD_MAJOR) |
515 | unit &= ~((1<<MdpMinorShift)-1); | |
516 | ||
1da177e4 LT |
517 | retry: |
518 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
519 | |
520 | if (unit) { | |
521 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
522 | if (mddev->unit == unit) { | |
523 | mddev_get(mddev); | |
524 | spin_unlock(&all_mddevs_lock); | |
525 | kfree(new); | |
526 | return mddev; | |
527 | } | |
528 | ||
529 | if (new) { | |
530 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 531 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
532 | new->hold_active = UNTIL_IOCTL; |
533 | return new; | |
1da177e4 | 534 | } |
efeb53c0 N |
535 | } else if (new) { |
536 | /* find an unused unit number */ | |
537 | static int next_minor = 512; | |
538 | int start = next_minor; | |
539 | int is_free = 0; | |
540 | int dev = 0; | |
541 | while (!is_free) { | |
542 | dev = MKDEV(MD_MAJOR, next_minor); | |
543 | next_minor++; | |
544 | if (next_minor > MINORMASK) | |
545 | next_minor = 0; | |
546 | if (next_minor == start) { | |
547 | /* Oh dear, all in use. */ | |
548 | spin_unlock(&all_mddevs_lock); | |
549 | kfree(new); | |
550 | return NULL; | |
551 | } | |
f72ffdd6 | 552 | |
efeb53c0 N |
553 | is_free = 1; |
554 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
555 | if (mddev->unit == dev) { | |
556 | is_free = 0; | |
557 | break; | |
558 | } | |
559 | } | |
560 | new->unit = dev; | |
561 | new->md_minor = MINOR(dev); | |
562 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
563 | list_add(&new->all_mddevs, &all_mddevs); |
564 | spin_unlock(&all_mddevs_lock); | |
565 | return new; | |
566 | } | |
567 | spin_unlock(&all_mddevs_lock); | |
568 | ||
9ffae0cf | 569 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
570 | if (!new) |
571 | return NULL; | |
572 | ||
1da177e4 LT |
573 | new->unit = unit; |
574 | if (MAJOR(unit) == MD_MAJOR) | |
575 | new->md_minor = MINOR(unit); | |
576 | else | |
577 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
578 | ||
fafd7fb0 | 579 | mddev_init(new); |
1da177e4 | 580 | |
1da177e4 LT |
581 | goto retry; |
582 | } | |
583 | ||
b6eb127d N |
584 | static struct attribute_group md_redundancy_group; |
585 | ||
5c47daf6 | 586 | void mddev_unlock(struct mddev *mddev) |
1da177e4 | 587 | { |
a64c876f | 588 | if (mddev->to_remove) { |
b6eb127d N |
589 | /* These cannot be removed under reconfig_mutex as |
590 | * an access to the files will try to take reconfig_mutex | |
591 | * while holding the file unremovable, which leads to | |
592 | * a deadlock. | |
bb4f1e9d N |
593 | * So hold set sysfs_active while the remove in happeing, |
594 | * and anything else which might set ->to_remove or my | |
595 | * otherwise change the sysfs namespace will fail with | |
596 | * -EBUSY if sysfs_active is still set. | |
597 | * We set sysfs_active under reconfig_mutex and elsewhere | |
598 | * test it under the same mutex to ensure its correct value | |
599 | * is seen. | |
b6eb127d | 600 | */ |
a64c876f N |
601 | struct attribute_group *to_remove = mddev->to_remove; |
602 | mddev->to_remove = NULL; | |
bb4f1e9d | 603 | mddev->sysfs_active = 1; |
b6eb127d N |
604 | mutex_unlock(&mddev->reconfig_mutex); |
605 | ||
00bcb4ac N |
606 | if (mddev->kobj.sd) { |
607 | if (to_remove != &md_redundancy_group) | |
608 | sysfs_remove_group(&mddev->kobj, to_remove); | |
609 | if (mddev->pers == NULL || | |
610 | mddev->pers->sync_request == NULL) { | |
611 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
612 | if (mddev->sysfs_action) | |
613 | sysfs_put(mddev->sysfs_action); | |
614 | mddev->sysfs_action = NULL; | |
615 | } | |
a64c876f | 616 | } |
bb4f1e9d | 617 | mddev->sysfs_active = 0; |
b6eb127d N |
618 | } else |
619 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 620 | |
751e67ca CD |
621 | /* As we've dropped the mutex we need a spinlock to |
622 | * make sure the thread doesn't disappear | |
01f96c0a N |
623 | */ |
624 | spin_lock(&pers_lock); | |
005eca5e | 625 | md_wakeup_thread(mddev->thread); |
01f96c0a | 626 | spin_unlock(&pers_lock); |
1da177e4 | 627 | } |
5c47daf6 | 628 | EXPORT_SYMBOL_GPL(mddev_unlock); |
1da177e4 | 629 | |
57d051dc | 630 | struct md_rdev *md_find_rdev_nr_rcu(struct mddev *mddev, int nr) |
1ca69c4b N |
631 | { |
632 | struct md_rdev *rdev; | |
633 | ||
634 | rdev_for_each_rcu(rdev, mddev) | |
635 | if (rdev->desc_nr == nr) | |
636 | return rdev; | |
637 | ||
638 | return NULL; | |
639 | } | |
57d051dc | 640 | EXPORT_SYMBOL_GPL(md_find_rdev_nr_rcu); |
1ca69c4b N |
641 | |
642 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 643 | { |
3cb03002 | 644 | struct md_rdev *rdev; |
1da177e4 | 645 | |
dafb20fa | 646 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
647 | if (rdev->bdev->bd_dev == dev) |
648 | return rdev; | |
159ec1fc | 649 | |
1da177e4 LT |
650 | return NULL; |
651 | } | |
652 | ||
1ca69c4b N |
653 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
654 | { | |
655 | struct md_rdev *rdev; | |
656 | ||
657 | rdev_for_each_rcu(rdev, mddev) | |
658 | if (rdev->bdev->bd_dev == dev) | |
659 | return rdev; | |
660 | ||
661 | return NULL; | |
662 | } | |
663 | ||
84fc4b56 | 664 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 665 | { |
84fc4b56 | 666 | struct md_personality *pers; |
d9d166c2 N |
667 | list_for_each_entry(pers, &pers_list, list) { |
668 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 669 | return pers; |
d9d166c2 N |
670 | if (strcmp(pers->name, clevel)==0) |
671 | return pers; | |
672 | } | |
2604b703 N |
673 | return NULL; |
674 | } | |
675 | ||
b73df2d3 | 676 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 677 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 678 | { |
57b2caa3 | 679 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 680 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
681 | } |
682 | ||
f72ffdd6 | 683 | static int alloc_disk_sb(struct md_rdev *rdev) |
1da177e4 | 684 | { |
1da177e4 LT |
685 | rdev->sb_page = alloc_page(GFP_KERNEL); |
686 | if (!rdev->sb_page) { | |
687 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 688 | return -ENOMEM; |
1da177e4 LT |
689 | } |
690 | ||
691 | return 0; | |
692 | } | |
693 | ||
545c8795 | 694 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
695 | { |
696 | if (rdev->sb_page) { | |
2d1f3b5d | 697 | put_page(rdev->sb_page); |
1da177e4 LT |
698 | rdev->sb_loaded = 0; |
699 | rdev->sb_page = NULL; | |
0f420358 | 700 | rdev->sb_start = 0; |
dd8ac336 | 701 | rdev->sectors = 0; |
1da177e4 | 702 | } |
2699b672 N |
703 | if (rdev->bb_page) { |
704 | put_page(rdev->bb_page); | |
705 | rdev->bb_page = NULL; | |
706 | } | |
d3b407fb | 707 | badblocks_exit(&rdev->badblocks); |
1da177e4 | 708 | } |
545c8795 | 709 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 710 | |
4246a0b6 | 711 | static void super_written(struct bio *bio) |
7bfa19f2 | 712 | { |
3cb03002 | 713 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 714 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 715 | |
4246a0b6 CH |
716 | if (bio->bi_error) { |
717 | printk("md: super_written gets error=%d\n", bio->bi_error); | |
a9701a30 | 718 | md_error(mddev, rdev); |
3a0f5bbb | 719 | } |
7bfa19f2 | 720 | |
a9701a30 N |
721 | if (atomic_dec_and_test(&mddev->pending_writes)) |
722 | wake_up(&mddev->sb_wait); | |
ed3b98c7 | 723 | rdev_dec_pending(rdev, mddev); |
f8b58edf | 724 | bio_put(bio); |
7bfa19f2 N |
725 | } |
726 | ||
fd01b88c | 727 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
728 | sector_t sector, int size, struct page *page) |
729 | { | |
730 | /* write first size bytes of page to sector of rdev | |
731 | * Increment mddev->pending_writes before returning | |
732 | * and decrement it on completion, waking up sb_wait | |
733 | * if zero is reached. | |
734 | * If an error occurred, call md_error | |
735 | */ | |
a167f663 | 736 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 737 | |
ed3b98c7 SL |
738 | atomic_inc(&rdev->nr_pending); |
739 | ||
a6ff7e08 | 740 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
4f024f37 | 741 | bio->bi_iter.bi_sector = sector; |
7bfa19f2 N |
742 | bio_add_page(bio, page, size, 0); |
743 | bio->bi_private = rdev; | |
744 | bio->bi_end_io = super_written; | |
a9701a30 | 745 | |
7bfa19f2 | 746 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 747 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
748 | } |
749 | ||
fd01b88c | 750 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 751 | { |
e9c7469b | 752 | /* wait for all superblock writes that were scheduled to complete */ |
1967cd56 | 753 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
7bfa19f2 N |
754 | } |
755 | ||
3cb03002 | 756 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 757 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 758 | { |
a167f663 | 759 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
760 | int ret; |
761 | ||
a6ff7e08 JB |
762 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
763 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 | 764 | if (metadata_op) |
4f024f37 | 765 | bio->bi_iter.bi_sector = sector + rdev->sb_start; |
1fdd6fc9 N |
766 | else if (rdev->mddev->reshape_position != MaxSector && |
767 | (rdev->mddev->reshape_backwards == | |
768 | (sector >= rdev->mddev->reshape_position))) | |
4f024f37 | 769 | bio->bi_iter.bi_sector = sector + rdev->new_data_offset; |
ccebd4c4 | 770 | else |
4f024f37 | 771 | bio->bi_iter.bi_sector = sector + rdev->data_offset; |
1da177e4 | 772 | bio_add_page(bio, page, size, 0); |
c170bbb4 | 773 | submit_bio_wait(rw, bio); |
1da177e4 | 774 | |
4246a0b6 | 775 | ret = !bio->bi_error; |
1da177e4 LT |
776 | bio_put(bio); |
777 | return ret; | |
778 | } | |
a8745db2 | 779 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 780 | |
f72ffdd6 | 781 | static int read_disk_sb(struct md_rdev *rdev, int size) |
1da177e4 LT |
782 | { |
783 | char b[BDEVNAME_SIZE]; | |
403df478 | 784 | |
1da177e4 LT |
785 | if (rdev->sb_loaded) |
786 | return 0; | |
787 | ||
ccebd4c4 | 788 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
789 | goto fail; |
790 | rdev->sb_loaded = 1; | |
791 | return 0; | |
792 | ||
793 | fail: | |
794 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
795 | bdevname(rdev->bdev,b)); | |
796 | return -EINVAL; | |
797 | } | |
798 | ||
799 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
800 | { | |
f72ffdd6 | 801 | return sb1->set_uuid0 == sb2->set_uuid0 && |
05710466 AN |
802 | sb1->set_uuid1 == sb2->set_uuid1 && |
803 | sb1->set_uuid2 == sb2->set_uuid2 && | |
804 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
805 | } |
806 | ||
1da177e4 LT |
807 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
808 | { | |
809 | int ret; | |
810 | mdp_super_t *tmp1, *tmp2; | |
811 | ||
812 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
813 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
814 | ||
815 | if (!tmp1 || !tmp2) { | |
816 | ret = 0; | |
35020f1a | 817 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
818 | goto abort; |
819 | } | |
820 | ||
821 | *tmp1 = *sb1; | |
822 | *tmp2 = *sb2; | |
823 | ||
824 | /* | |
825 | * nr_disks is not constant | |
826 | */ | |
827 | tmp1->nr_disks = 0; | |
828 | tmp2->nr_disks = 0; | |
829 | ||
ce0c8e05 | 830 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 831 | abort: |
990a8baf JJ |
832 | kfree(tmp1); |
833 | kfree(tmp2); | |
1da177e4 LT |
834 | return ret; |
835 | } | |
836 | ||
4d167f09 N |
837 | static u32 md_csum_fold(u32 csum) |
838 | { | |
839 | csum = (csum & 0xffff) + (csum >> 16); | |
840 | return (csum & 0xffff) + (csum >> 16); | |
841 | } | |
842 | ||
f72ffdd6 | 843 | static unsigned int calc_sb_csum(mdp_super_t *sb) |
1da177e4 | 844 | { |
4d167f09 N |
845 | u64 newcsum = 0; |
846 | u32 *sb32 = (u32*)sb; | |
847 | int i; | |
1da177e4 LT |
848 | unsigned int disk_csum, csum; |
849 | ||
850 | disk_csum = sb->sb_csum; | |
851 | sb->sb_csum = 0; | |
4d167f09 N |
852 | |
853 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
854 | newcsum += sb32[i]; | |
855 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
856 | ||
4d167f09 N |
857 | #ifdef CONFIG_ALPHA |
858 | /* This used to use csum_partial, which was wrong for several | |
859 | * reasons including that different results are returned on | |
860 | * different architectures. It isn't critical that we get exactly | |
861 | * the same return value as before (we always csum_fold before | |
862 | * testing, and that removes any differences). However as we | |
863 | * know that csum_partial always returned a 16bit value on | |
864 | * alphas, do a fold to maximise conformity to previous behaviour. | |
865 | */ | |
866 | sb->sb_csum = md_csum_fold(disk_csum); | |
867 | #else | |
1da177e4 | 868 | sb->sb_csum = disk_csum; |
4d167f09 | 869 | #endif |
1da177e4 LT |
870 | return csum; |
871 | } | |
872 | ||
1da177e4 LT |
873 | /* |
874 | * Handle superblock details. | |
875 | * We want to be able to handle multiple superblock formats | |
876 | * so we have a common interface to them all, and an array of | |
877 | * different handlers. | |
878 | * We rely on user-space to write the initial superblock, and support | |
879 | * reading and updating of superblocks. | |
880 | * Interface methods are: | |
3cb03002 | 881 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
882 | * loads and validates a superblock on dev. |
883 | * if refdev != NULL, compare superblocks on both devices | |
884 | * Return: | |
885 | * 0 - dev has a superblock that is compatible with refdev | |
886 | * 1 - dev has a superblock that is compatible and newer than refdev | |
887 | * so dev should be used as the refdev in future | |
888 | * -EINVAL superblock incompatible or invalid | |
889 | * -othererror e.g. -EIO | |
890 | * | |
fd01b88c | 891 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
892 | * Verify that dev is acceptable into mddev. |
893 | * The first time, mddev->raid_disks will be 0, and data from | |
894 | * dev should be merged in. Subsequent calls check that dev | |
895 | * is new enough. Return 0 or -EINVAL | |
896 | * | |
fd01b88c | 897 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
898 | * Update the superblock for rdev with data in mddev |
899 | * This does not write to disc. | |
900 | * | |
901 | */ | |
902 | ||
903 | struct super_type { | |
0cd17fec CW |
904 | char *name; |
905 | struct module *owner; | |
c6563a8c N |
906 | int (*load_super)(struct md_rdev *rdev, |
907 | struct md_rdev *refdev, | |
0cd17fec | 908 | int minor_version); |
c6563a8c N |
909 | int (*validate_super)(struct mddev *mddev, |
910 | struct md_rdev *rdev); | |
911 | void (*sync_super)(struct mddev *mddev, | |
912 | struct md_rdev *rdev); | |
3cb03002 | 913 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 914 | sector_t num_sectors); |
c6563a8c N |
915 | int (*allow_new_offset)(struct md_rdev *rdev, |
916 | unsigned long long new_offset); | |
1da177e4 LT |
917 | }; |
918 | ||
0894cc30 AN |
919 | /* |
920 | * Check that the given mddev has no bitmap. | |
921 | * | |
922 | * This function is called from the run method of all personalities that do not | |
923 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
924 | * has a bitmap. Otherwise, it returns 0. | |
925 | * | |
926 | */ | |
fd01b88c | 927 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 928 | { |
c3d9714e | 929 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
930 | return 0; |
931 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
932 | mdname(mddev), mddev->pers->name); | |
933 | return 1; | |
934 | } | |
935 | EXPORT_SYMBOL(md_check_no_bitmap); | |
936 | ||
1da177e4 | 937 | /* |
f72ffdd6 | 938 | * load_super for 0.90.0 |
1da177e4 | 939 | */ |
3cb03002 | 940 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
941 | { |
942 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
943 | mdp_super_t *sb; | |
944 | int ret; | |
1da177e4 LT |
945 | |
946 | /* | |
0f420358 | 947 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
948 | * it's at the end of the disk. |
949 | * | |
950 | * It also happens to be a multiple of 4Kb. | |
951 | */ | |
57b2caa3 | 952 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 953 | |
0002b271 | 954 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
955 | if (ret) return ret; |
956 | ||
957 | ret = -EINVAL; | |
958 | ||
959 | bdevname(rdev->bdev, b); | |
65a06f06 | 960 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
961 | |
962 | if (sb->md_magic != MD_SB_MAGIC) { | |
963 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
964 | b); | |
965 | goto abort; | |
966 | } | |
967 | ||
968 | if (sb->major_version != 0 || | |
f6705578 N |
969 | sb->minor_version < 90 || |
970 | sb->minor_version > 91) { | |
1da177e4 LT |
971 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
972 | sb->major_version, sb->minor_version, | |
973 | b); | |
974 | goto abort; | |
975 | } | |
976 | ||
977 | if (sb->raid_disks <= 0) | |
978 | goto abort; | |
979 | ||
4d167f09 | 980 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
981 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
982 | b); | |
983 | goto abort; | |
984 | } | |
985 | ||
986 | rdev->preferred_minor = sb->md_minor; | |
987 | rdev->data_offset = 0; | |
c6563a8c | 988 | rdev->new_data_offset = 0; |
0002b271 | 989 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 990 | rdev->badblocks.shift = -1; |
1da177e4 LT |
991 | |
992 | if (sb->level == LEVEL_MULTIPATH) | |
993 | rdev->desc_nr = -1; | |
994 | else | |
995 | rdev->desc_nr = sb->this_disk.number; | |
996 | ||
9a7b2b0f | 997 | if (!refdev) { |
1da177e4 | 998 | ret = 1; |
9a7b2b0f | 999 | } else { |
1da177e4 | 1000 | __u64 ev1, ev2; |
65a06f06 | 1001 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1002 | if (!uuid_equal(refsb, sb)) { |
1003 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1004 | b, bdevname(refdev->bdev,b2)); | |
1005 | goto abort; | |
1006 | } | |
1007 | if (!sb_equal(refsb, sb)) { | |
1008 | printk(KERN_WARNING "md: %s has same UUID" | |
1009 | " but different superblock to %s\n", | |
1010 | b, bdevname(refdev->bdev, b2)); | |
1011 | goto abort; | |
1012 | } | |
1013 | ev1 = md_event(sb); | |
1014 | ev2 = md_event(refsb); | |
1015 | if (ev1 > ev2) | |
1016 | ret = 1; | |
f72ffdd6 | 1017 | else |
1da177e4 LT |
1018 | ret = 0; |
1019 | } | |
8190e754 | 1020 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1021 | /* Limit to 4TB as metadata cannot record more than that. |
1022 | * (not needed for Linear and RAID0 as metadata doesn't | |
1023 | * record this size) | |
1024 | */ | |
3312c951 AB |
1025 | if (IS_ENABLED(CONFIG_LBDAF) && (u64)rdev->sectors >= (2ULL << 32) && |
1026 | sb->level >= 1) | |
1027 | rdev->sectors = (sector_t)(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 | ||
9ebc6ef1 | 1199 | sb->ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); |
1da177e4 | 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; |
9ebc6ef1 | 1205 | sb->utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); |
1da177e4 LT |
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 | */ | |
3312c951 AB |
1320 | if (IS_ENABLED(CONFIG_LBDAF) && (u64)num_sectors >= (2ULL << 32) && |
1321 | rdev->mddev->level >= 1) | |
1322 | num_sectors = (sector_t)(2ULL << 32) - 2; | |
0f420358 | 1323 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1324 | rdev->sb_page); |
1325 | md_super_wait(rdev->mddev); | |
c26a44ed | 1326 | return num_sectors; |
0cd17fec CW |
1327 | } |
1328 | ||
c6563a8c N |
1329 | static int |
1330 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1331 | { | |
1332 | /* non-zero offset changes not possible with v0.90 */ | |
1333 | return new_offset == 0; | |
1334 | } | |
0cd17fec | 1335 | |
1da177e4 LT |
1336 | /* |
1337 | * version 1 superblock | |
1338 | */ | |
1339 | ||
f72ffdd6 | 1340 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 *sb) |
1da177e4 | 1341 | { |
1c05b4bc N |
1342 | __le32 disk_csum; |
1343 | u32 csum; | |
1da177e4 LT |
1344 | unsigned long long newcsum; |
1345 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1346 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1347 | |
1348 | disk_csum = sb->sb_csum; | |
1349 | sb->sb_csum = 0; | |
1350 | newcsum = 0; | |
1f3c9907 | 1351 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1352 | newcsum += le32_to_cpu(*isuper++); |
1353 | ||
1354 | if (size == 2) | |
1c05b4bc | 1355 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1356 | |
1357 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1358 | sb->sb_csum = disk_csum; | |
1359 | return cpu_to_le32(csum); | |
1360 | } | |
1361 | ||
3cb03002 | 1362 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1363 | { |
1364 | struct mdp_superblock_1 *sb; | |
1365 | int ret; | |
0f420358 | 1366 | sector_t sb_start; |
c6563a8c | 1367 | sector_t sectors; |
1da177e4 | 1368 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1369 | int bmask; |
1da177e4 LT |
1370 | |
1371 | /* | |
0f420358 | 1372 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1373 | * It is always aligned to a 4K boundary and |
1374 | * depeding on minor_version, it can be: | |
1375 | * 0: At least 8K, but less than 12K, from end of device | |
1376 | * 1: At start of device | |
1377 | * 2: 4K from start of device. | |
1378 | */ | |
1379 | switch(minor_version) { | |
1380 | case 0: | |
77304d2a | 1381 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1382 | sb_start -= 8*2; |
1383 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1384 | break; |
1385 | case 1: | |
0f420358 | 1386 | sb_start = 0; |
1da177e4 LT |
1387 | break; |
1388 | case 2: | |
0f420358 | 1389 | sb_start = 8; |
1da177e4 LT |
1390 | break; |
1391 | default: | |
1392 | return -EINVAL; | |
1393 | } | |
0f420358 | 1394 | rdev->sb_start = sb_start; |
1da177e4 | 1395 | |
0002b271 N |
1396 | /* superblock is rarely larger than 1K, but it can be larger, |
1397 | * and it is safe to read 4k, so we do that | |
1398 | */ | |
1399 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1400 | if (ret) return ret; |
1401 | ||
65a06f06 | 1402 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1403 | |
1404 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1405 | sb->major_version != cpu_to_le32(1) || | |
1406 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1407 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1408 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1409 | return -EINVAL; |
1410 | ||
1411 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1412 | printk("md: invalid superblock checksum on %s\n", | |
1413 | bdevname(rdev->bdev,b)); | |
1414 | return -EINVAL; | |
1415 | } | |
1416 | if (le64_to_cpu(sb->data_size) < 10) { | |
1417 | printk("md: data_size too small on %s\n", | |
1418 | bdevname(rdev->bdev,b)); | |
1419 | return -EINVAL; | |
1420 | } | |
c6563a8c N |
1421 | if (sb->pad0 || |
1422 | sb->pad3[0] || | |
1423 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1424 | /* Some padding is non-zero, might be a new feature */ | |
1425 | return -EINVAL; | |
e11e93fa | 1426 | |
1da177e4 LT |
1427 | rdev->preferred_minor = 0xffff; |
1428 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1429 | rdev->new_data_offset = rdev->data_offset; |
1430 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1431 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1432 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1433 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1434 | |
0002b271 | 1435 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1436 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1437 | if (rdev->sb_size & bmask) |
a1801f85 N |
1438 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1439 | ||
1440 | if (minor_version | |
0f420358 | 1441 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1442 | return -EINVAL; |
c6563a8c N |
1443 | if (minor_version |
1444 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1445 | return -EINVAL; | |
0002b271 | 1446 | |
31b65a0d N |
1447 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1448 | rdev->desc_nr = -1; | |
1449 | else | |
1450 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1451 | ||
2699b672 N |
1452 | if (!rdev->bb_page) { |
1453 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1454 | if (!rdev->bb_page) | |
1455 | return -ENOMEM; | |
1456 | } | |
1457 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1458 | rdev->badblocks.count == 0) { | |
1459 | /* need to load the bad block list. | |
1460 | * Currently we limit it to one page. | |
1461 | */ | |
1462 | s32 offset; | |
1463 | sector_t bb_sector; | |
1464 | u64 *bbp; | |
1465 | int i; | |
1466 | int sectors = le16_to_cpu(sb->bblog_size); | |
1467 | if (sectors > (PAGE_SIZE / 512)) | |
1468 | return -EINVAL; | |
1469 | offset = le32_to_cpu(sb->bblog_offset); | |
1470 | if (offset == 0) | |
1471 | return -EINVAL; | |
1472 | bb_sector = (long long)offset; | |
1473 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1474 | rdev->bb_page, READ, true)) | |
1475 | return -EIO; | |
1476 | bbp = (u64 *)page_address(rdev->bb_page); | |
1477 | rdev->badblocks.shift = sb->bblog_shift; | |
1478 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1479 | u64 bb = le64_to_cpu(*bbp); | |
1480 | int count = bb & (0x3ff); | |
1481 | u64 sector = bb >> 10; | |
1482 | sector <<= sb->bblog_shift; | |
1483 | count <<= sb->bblog_shift; | |
1484 | if (bb + 1 == 0) | |
1485 | break; | |
fc974ee2 | 1486 | if (badblocks_set(&rdev->badblocks, sector, count, 1)) |
2699b672 N |
1487 | return -EINVAL; |
1488 | } | |
486adf72 N |
1489 | } else if (sb->bblog_offset != 0) |
1490 | rdev->badblocks.shift = 0; | |
2699b672 | 1491 | |
9a7b2b0f | 1492 | if (!refdev) { |
8ed75463 | 1493 | ret = 1; |
9a7b2b0f | 1494 | } else { |
1da177e4 | 1495 | __u64 ev1, ev2; |
65a06f06 | 1496 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1497 | |
1498 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1499 | sb->level != refsb->level || | |
1500 | sb->layout != refsb->layout || | |
1501 | sb->chunksize != refsb->chunksize) { | |
1502 | printk(KERN_WARNING "md: %s has strangely different" | |
1503 | " superblock to %s\n", | |
1504 | bdevname(rdev->bdev,b), | |
1505 | bdevname(refdev->bdev,b2)); | |
1506 | return -EINVAL; | |
1507 | } | |
1508 | ev1 = le64_to_cpu(sb->events); | |
1509 | ev2 = le64_to_cpu(refsb->events); | |
1510 | ||
1511 | if (ev1 > ev2) | |
8ed75463 N |
1512 | ret = 1; |
1513 | else | |
1514 | ret = 0; | |
1da177e4 | 1515 | } |
c6563a8c N |
1516 | if (minor_version) { |
1517 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1518 | sectors -= rdev->data_offset; | |
1519 | } else | |
1520 | sectors = rdev->sb_start; | |
1521 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1522 | return -EINVAL; |
dd8ac336 | 1523 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1524 | return ret; |
1da177e4 LT |
1525 | } |
1526 | ||
fd01b88c | 1527 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1528 | { |
65a06f06 | 1529 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1530 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1531 | |
41158c7e | 1532 | rdev->raid_disk = -1; |
c5d79adb N |
1533 | clear_bit(Faulty, &rdev->flags); |
1534 | clear_bit(In_sync, &rdev->flags); | |
8313b8e5 | 1535 | clear_bit(Bitmap_sync, &rdev->flags); |
c5d79adb | 1536 | clear_bit(WriteMostly, &rdev->flags); |
c5d79adb | 1537 | |
1da177e4 LT |
1538 | if (mddev->raid_disks == 0) { |
1539 | mddev->major_version = 1; | |
1540 | mddev->patch_version = 0; | |
e691063a | 1541 | mddev->external = 0; |
9d8f0363 | 1542 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
9ebc6ef1 DD |
1543 | mddev->ctime = le64_to_cpu(sb->ctime); |
1544 | mddev->utime = le64_to_cpu(sb->utime); | |
1da177e4 | 1545 | mddev->level = le32_to_cpu(sb->level); |
d9d166c2 | 1546 | mddev->clevel[0] = 0; |
1da177e4 LT |
1547 | mddev->layout = le32_to_cpu(sb->layout); |
1548 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1549 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1550 | mddev->events = ev1; |
c3d9714e | 1551 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1552 | mddev->bitmap_info.space = 0; |
1553 | /* Default location for bitmap is 1K after superblock | |
1554 | * using 3K - total of 4K | |
1555 | */ | |
c3d9714e | 1556 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1557 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1558 | mddev->reshape_backwards = 0; |
1559 | ||
1da177e4 LT |
1560 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1561 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1562 | ||
1563 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1564 | |
71c0805c | 1565 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1566 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1567 | mddev->bitmap_info.offset = |
1568 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1569 | /* Metadata doesn't record how much space is available. |
1570 | * For 1.0, we assume we can use up to the superblock | |
1571 | * if before, else to 4K beyond superblock. | |
1572 | * For others, assume no change is possible. | |
1573 | */ | |
1574 | if (mddev->minor_version > 0) | |
1575 | mddev->bitmap_info.space = 0; | |
1576 | else if (mddev->bitmap_info.offset > 0) | |
1577 | mddev->bitmap_info.space = | |
1578 | 8 - mddev->bitmap_info.offset; | |
1579 | else | |
1580 | mddev->bitmap_info.space = | |
1581 | -mddev->bitmap_info.offset; | |
1582 | } | |
e11e93fa | 1583 | |
f6705578 N |
1584 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1585 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1586 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1587 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1588 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1589 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1590 | if (mddev->delta_disks < 0 || |
1591 | (mddev->delta_disks == 0 && | |
1592 | (le32_to_cpu(sb->feature_map) | |
1593 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1594 | mddev->reshape_backwards = 1; | |
f6705578 N |
1595 | } else { |
1596 | mddev->reshape_position = MaxSector; | |
1597 | mddev->delta_disks = 0; | |
1598 | mddev->new_level = mddev->level; | |
1599 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1600 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1601 | } |
1602 | ||
a62ab49e SL |
1603 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL) { |
1604 | set_bit(MD_HAS_JOURNAL, &mddev->flags); | |
1605 | if (mddev->recovery_cp == MaxSector) | |
1606 | set_bit(MD_JOURNAL_CLEAN, &mddev->flags); | |
1607 | } | |
41158c7e | 1608 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1609 | /* Insist of good event counter while assembling, except for |
1610 | * spares (which don't need an event count) */ | |
1da177e4 | 1611 | ++ev1; |
be6800a7 N |
1612 | if (rdev->desc_nr >= 0 && |
1613 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
a3dfbdaa SL |
1614 | (le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < MD_DISK_ROLE_MAX || |
1615 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) == MD_DISK_ROLE_JOURNAL)) | |
be6800a7 N |
1616 | if (ev1 < mddev->events) |
1617 | return -EINVAL; | |
41158c7e N |
1618 | } else if (mddev->bitmap) { |
1619 | /* If adding to array with a bitmap, then we can accept an | |
1620 | * older device, but not too old. | |
1621 | */ | |
41158c7e N |
1622 | if (ev1 < mddev->bitmap->events_cleared) |
1623 | return 0; | |
8313b8e5 N |
1624 | if (ev1 < mddev->events) |
1625 | set_bit(Bitmap_sync, &rdev->flags); | |
07d84d10 N |
1626 | } else { |
1627 | if (ev1 < mddev->events) | |
1628 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1629 | return 0; | |
1630 | } | |
1da177e4 LT |
1631 | if (mddev->level != LEVEL_MULTIPATH) { |
1632 | int role; | |
3673f305 N |
1633 | if (rdev->desc_nr < 0 || |
1634 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
c4d4c91b | 1635 | role = MD_DISK_ROLE_SPARE; |
3673f305 N |
1636 | rdev->desc_nr = -1; |
1637 | } else | |
1638 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 | 1639 | switch(role) { |
c4d4c91b | 1640 | case MD_DISK_ROLE_SPARE: /* spare */ |
1da177e4 | 1641 | break; |
c4d4c91b | 1642 | case MD_DISK_ROLE_FAULTY: /* faulty */ |
b2d444d7 | 1643 | set_bit(Faulty, &rdev->flags); |
1da177e4 | 1644 | break; |
bac624f3 SL |
1645 | case MD_DISK_ROLE_JOURNAL: /* journal device */ |
1646 | if (!(le32_to_cpu(sb->feature_map) & MD_FEATURE_JOURNAL)) { | |
1647 | /* journal device without journal feature */ | |
1648 | printk(KERN_WARNING | |
1649 | "md: journal device provided without journal feature, ignoring the device\n"); | |
1650 | return -EINVAL; | |
1651 | } | |
1652 | set_bit(Journal, &rdev->flags); | |
3069aa8d | 1653 | rdev->journal_tail = le64_to_cpu(sb->journal_tail); |
9b15603d | 1654 | rdev->raid_disk = 0; |
bac624f3 | 1655 | break; |
1da177e4 | 1656 | default: |
f466722c | 1657 | rdev->saved_raid_disk = role; |
5fd6c1dc | 1658 | if ((le32_to_cpu(sb->feature_map) & |
f466722c | 1659 | MD_FEATURE_RECOVERY_OFFSET)) { |
5fd6c1dc | 1660 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); |
f466722c N |
1661 | if (!(le32_to_cpu(sb->feature_map) & |
1662 | MD_FEATURE_RECOVERY_BITMAP)) | |
1663 | rdev->saved_raid_disk = -1; | |
1664 | } else | |
5fd6c1dc | 1665 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1666 | rdev->raid_disk = role; |
1667 | break; | |
1668 | } | |
8ddf9efe N |
1669 | if (sb->devflags & WriteMostly1) |
1670 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1671 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1672 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1673 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1674 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1675 | |
1da177e4 LT |
1676 | return 0; |
1677 | } | |
1678 | ||
fd01b88c | 1679 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1680 | { |
1681 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1682 | struct md_rdev *rdev2; |
1da177e4 LT |
1683 | int max_dev, i; |
1684 | /* make rdev->sb match mddev and rdev data. */ | |
1685 | ||
65a06f06 | 1686 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1687 | |
1688 | sb->feature_map = 0; | |
1689 | sb->pad0 = 0; | |
5fd6c1dc | 1690 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1691 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1692 | ||
1693 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1694 | sb->events = cpu_to_le64(mddev->events); | |
1695 | if (mddev->in_sync) | |
1696 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
bd18f646 SL |
1697 | else if (test_bit(MD_JOURNAL_CLEAN, &mddev->flags)) |
1698 | sb->resync_offset = cpu_to_le64(MaxSector); | |
1da177e4 LT |
1699 | else |
1700 | sb->resync_offset = cpu_to_le64(0); | |
1701 | ||
1c05b4bc | 1702 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1703 | |
f0ca340c | 1704 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1705 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1706 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1707 | sb->level = cpu_to_le32(mddev->level); |
1708 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1709 | |
aeb9b211 N |
1710 | if (test_bit(WriteMostly, &rdev->flags)) |
1711 | sb->devflags |= WriteMostly1; | |
1712 | else | |
1713 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1714 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1715 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1716 | |
c3d9714e N |
1717 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1718 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1719 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1720 | } |
5fd6c1dc | 1721 | |
f2076e7d | 1722 | if (rdev->raid_disk >= 0 && !test_bit(Journal, &rdev->flags) && |
97e4f42d | 1723 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1724 | sb->feature_map |= |
1725 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1726 | sb->recovery_offset = | |
1727 | cpu_to_le64(rdev->recovery_offset); | |
f466722c N |
1728 | if (rdev->saved_raid_disk >= 0 && mddev->bitmap) |
1729 | sb->feature_map |= | |
1730 | cpu_to_le32(MD_FEATURE_RECOVERY_BITMAP); | |
5fd6c1dc | 1731 | } |
3069aa8d SL |
1732 | /* Note: recovery_offset and journal_tail share space */ |
1733 | if (test_bit(Journal, &rdev->flags)) | |
1734 | sb->journal_tail = cpu_to_le64(rdev->journal_tail); | |
2d78f8c4 N |
1735 | if (test_bit(Replacement, &rdev->flags)) |
1736 | sb->feature_map |= | |
1737 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1738 | |
f6705578 N |
1739 | if (mddev->reshape_position != MaxSector) { |
1740 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1741 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1742 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1743 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1744 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1745 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1746 | if (mddev->delta_disks == 0 && |
1747 | mddev->reshape_backwards) | |
1748 | sb->feature_map | |
1749 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1750 | if (rdev->new_data_offset != rdev->data_offset) { |
1751 | sb->feature_map | |
1752 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1753 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1754 | - rdev->data_offset)); | |
1755 | } | |
f6705578 | 1756 | } |
a654b9d8 | 1757 | |
3c462c88 GR |
1758 | if (mddev_is_clustered(mddev)) |
1759 | sb->feature_map |= cpu_to_le32(MD_FEATURE_CLUSTERED); | |
1760 | ||
2699b672 N |
1761 | if (rdev->badblocks.count == 0) |
1762 | /* Nothing to do for bad blocks*/ ; | |
1763 | else if (sb->bblog_offset == 0) | |
1764 | /* Cannot record bad blocks on this device */ | |
1765 | md_error(mddev, rdev); | |
1766 | else { | |
1767 | struct badblocks *bb = &rdev->badblocks; | |
1768 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1769 | u64 *p = bb->page; | |
1770 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1771 | if (bb->changed) { | |
1772 | unsigned seq; | |
1773 | ||
1774 | retry: | |
1775 | seq = read_seqbegin(&bb->lock); | |
1776 | ||
1777 | memset(bbp, 0xff, PAGE_SIZE); | |
1778 | ||
1779 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1780 | u64 internal_bb = p[i]; |
2699b672 N |
1781 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1782 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1783 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1784 | } |
d0962936 | 1785 | bb->changed = 0; |
2699b672 N |
1786 | if (read_seqretry(&bb->lock, seq)) |
1787 | goto retry; | |
1788 | ||
1789 | bb->sector = (rdev->sb_start + | |
1790 | (int)le32_to_cpu(sb->bblog_offset)); | |
1791 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1792 | } |
1793 | } | |
1794 | ||
1da177e4 | 1795 | max_dev = 0; |
dafb20fa | 1796 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1797 | if (rdev2->desc_nr+1 > max_dev) |
1798 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1799 | |
70471daf N |
1800 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1801 | int bmask; | |
a778b73f | 1802 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1803 | rdev->sb_size = max_dev * 2 + 256; |
1804 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1805 | if (rdev->sb_size & bmask) | |
1806 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1807 | } else |
1808 | max_dev = le32_to_cpu(sb->max_dev); | |
1809 | ||
1da177e4 | 1810 | for (i=0; i<max_dev;i++) |
c4d4c91b | 1811 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); |
f72ffdd6 | 1812 | |
a97b7896 SL |
1813 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) |
1814 | sb->feature_map |= cpu_to_le32(MD_FEATURE_JOURNAL); | |
f72ffdd6 | 1815 | |
dafb20fa | 1816 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1817 | i = rdev2->desc_nr; |
b2d444d7 | 1818 | if (test_bit(Faulty, &rdev2->flags)) |
c4d4c91b | 1819 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_FAULTY); |
b2d444d7 | 1820 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1821 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
a97b7896 | 1822 | else if (test_bit(Journal, &rdev2->flags)) |
bac624f3 | 1823 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_JOURNAL); |
93be75ff | 1824 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1825 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 | 1826 | else |
c4d4c91b | 1827 | sb->dev_roles[i] = cpu_to_le16(MD_DISK_ROLE_SPARE); |
1da177e4 LT |
1828 | } |
1829 | ||
1da177e4 LT |
1830 | sb->sb_csum = calc_sb_1_csum(sb); |
1831 | } | |
1832 | ||
0cd17fec | 1833 | static unsigned long long |
3cb03002 | 1834 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1835 | { |
1836 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1837 | sector_t max_sectors; |
58c0fed4 | 1838 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1839 | return 0; /* component must fit device */ |
c6563a8c N |
1840 | if (rdev->data_offset != rdev->new_data_offset) |
1841 | return 0; /* too confusing */ | |
0f420358 | 1842 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1843 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1844 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1845 | max_sectors -= rdev->data_offset; |
1846 | if (!num_sectors || num_sectors > max_sectors) | |
1847 | num_sectors = max_sectors; | |
c3d9714e | 1848 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1849 | /* minor version 0 with bitmap we can't move */ |
1850 | return 0; | |
1851 | } else { | |
1852 | /* minor version 0; superblock after data */ | |
0f420358 | 1853 | sector_t sb_start; |
77304d2a | 1854 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1855 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1856 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1857 | if (!num_sectors || num_sectors > max_sectors) |
1858 | num_sectors = max_sectors; | |
0f420358 | 1859 | rdev->sb_start = sb_start; |
0cd17fec | 1860 | } |
65a06f06 | 1861 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1862 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1863 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1864 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1865 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1866 | rdev->sb_page); |
1867 | md_super_wait(rdev->mddev); | |
c26a44ed | 1868 | return num_sectors; |
c6563a8c N |
1869 | |
1870 | } | |
1871 | ||
1872 | static int | |
1873 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1874 | unsigned long long new_offset) | |
1875 | { | |
1876 | /* All necessary checks on new >= old have been done */ | |
1877 | struct bitmap *bitmap; | |
1878 | if (new_offset >= rdev->data_offset) | |
1879 | return 1; | |
1880 | ||
1881 | /* with 1.0 metadata, there is no metadata to tread on | |
1882 | * so we can always move back */ | |
1883 | if (rdev->mddev->minor_version == 0) | |
1884 | return 1; | |
1885 | ||
1886 | /* otherwise we must be sure not to step on | |
1887 | * any metadata, so stay: | |
1888 | * 36K beyond start of superblock | |
1889 | * beyond end of badblocks | |
1890 | * beyond write-intent bitmap | |
1891 | */ | |
1892 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1893 | return 0; | |
1894 | bitmap = rdev->mddev->bitmap; | |
1895 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1896 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 1897 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
1898 | return 0; |
1899 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1900 | return 0; | |
1901 | ||
1902 | return 1; | |
0cd17fec | 1903 | } |
1da177e4 | 1904 | |
75c96f85 | 1905 | static struct super_type super_types[] = { |
1da177e4 LT |
1906 | [0] = { |
1907 | .name = "0.90.0", | |
1908 | .owner = THIS_MODULE, | |
0cd17fec CW |
1909 | .load_super = super_90_load, |
1910 | .validate_super = super_90_validate, | |
1911 | .sync_super = super_90_sync, | |
1912 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1913 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1914 | }, |
1915 | [1] = { | |
1916 | .name = "md-1", | |
1917 | .owner = THIS_MODULE, | |
0cd17fec CW |
1918 | .load_super = super_1_load, |
1919 | .validate_super = super_1_validate, | |
1920 | .sync_super = super_1_sync, | |
1921 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1922 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1923 | }, |
1924 | }; | |
1da177e4 | 1925 | |
fd01b88c | 1926 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1927 | { |
1928 | if (mddev->sync_super) { | |
1929 | mddev->sync_super(mddev, rdev); | |
1930 | return; | |
1931 | } | |
1932 | ||
1933 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1934 | ||
1935 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1936 | } | |
1937 | ||
fd01b88c | 1938 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1939 | { |
3cb03002 | 1940 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1941 | |
4b80991c | 1942 | rcu_read_lock(); |
0b020e85 SL |
1943 | rdev_for_each_rcu(rdev, mddev1) { |
1944 | if (test_bit(Faulty, &rdev->flags) || | |
1945 | test_bit(Journal, &rdev->flags) || | |
1946 | rdev->raid_disk == -1) | |
1947 | continue; | |
1948 | rdev_for_each_rcu(rdev2, mddev2) { | |
1949 | if (test_bit(Faulty, &rdev2->flags) || | |
1950 | test_bit(Journal, &rdev2->flags) || | |
1951 | rdev2->raid_disk == -1) | |
1952 | continue; | |
7dd5e7c3 | 1953 | if (rdev->bdev->bd_contains == |
4b80991c N |
1954 | rdev2->bdev->bd_contains) { |
1955 | rcu_read_unlock(); | |
7dd5e7c3 | 1956 | return 1; |
4b80991c | 1957 | } |
0b020e85 SL |
1958 | } |
1959 | } | |
4b80991c | 1960 | rcu_read_unlock(); |
1da177e4 LT |
1961 | return 0; |
1962 | } | |
1963 | ||
1964 | static LIST_HEAD(pending_raid_disks); | |
1965 | ||
ac5e7113 AN |
1966 | /* |
1967 | * Try to register data integrity profile for an mddev | |
1968 | * | |
1969 | * This is called when an array is started and after a disk has been kicked | |
1970 | * from the array. It only succeeds if all working and active component devices | |
1971 | * are integrity capable with matching profiles. | |
1972 | */ | |
fd01b88c | 1973 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1974 | { |
3cb03002 | 1975 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1976 | |
1977 | if (list_empty(&mddev->disks)) | |
1978 | return 0; /* nothing to do */ | |
629acb6a JB |
1979 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1980 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 1981 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
1982 | /* skip spares and non-functional disks */ |
1983 | if (test_bit(Faulty, &rdev->flags)) | |
1984 | continue; | |
1985 | if (rdev->raid_disk < 0) | |
1986 | continue; | |
ac5e7113 AN |
1987 | if (!reference) { |
1988 | /* Use the first rdev as the reference */ | |
1989 | reference = rdev; | |
1990 | continue; | |
1991 | } | |
1992 | /* does this rdev's profile match the reference profile? */ | |
1993 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1994 | rdev->bdev->bd_disk) < 0) | |
1995 | return -EINVAL; | |
1996 | } | |
89078d57 MP |
1997 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1998 | return 0; | |
ac5e7113 AN |
1999 | /* |
2000 | * All component devices are integrity capable and have matching | |
2001 | * profiles, register the common profile for the md device. | |
2002 | */ | |
25520d55 MP |
2003 | blk_integrity_register(mddev->gendisk, |
2004 | bdev_get_integrity(reference->bdev)); | |
2005 | ||
a91a2785 MP |
2006 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
2007 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
2008 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
2009 | mdname(mddev)); | |
2010 | return -EINVAL; | |
2011 | } | |
ac5e7113 AN |
2012 | return 0; |
2013 | } | |
2014 | EXPORT_SYMBOL(md_integrity_register); | |
2015 | ||
1501efad DW |
2016 | /* |
2017 | * Attempt to add an rdev, but only if it is consistent with the current | |
2018 | * integrity profile | |
2019 | */ | |
2020 | int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) | |
3f9d99c1 | 2021 | { |
2863b9eb JB |
2022 | struct blk_integrity *bi_rdev; |
2023 | struct blk_integrity *bi_mddev; | |
1501efad | 2024 | char name[BDEVNAME_SIZE]; |
2863b9eb JB |
2025 | |
2026 | if (!mddev->gendisk) | |
1501efad | 2027 | return 0; |
2863b9eb JB |
2028 | |
2029 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
2030 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 2031 | |
ac5e7113 | 2032 | if (!bi_mddev) /* nothing to do */ |
1501efad DW |
2033 | return 0; |
2034 | ||
2035 | if (blk_integrity_compare(mddev->gendisk, rdev->bdev->bd_disk) != 0) { | |
2036 | printk(KERN_NOTICE "%s: incompatible integrity profile for %s\n", | |
2037 | mdname(mddev), bdevname(rdev->bdev, name)); | |
2038 | return -ENXIO; | |
2039 | } | |
2040 | ||
2041 | return 0; | |
3f9d99c1 | 2042 | } |
ac5e7113 | 2043 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2044 | |
f72ffdd6 | 2045 | static int bind_rdev_to_array(struct md_rdev *rdev, struct mddev *mddev) |
1da177e4 | 2046 | { |
7dd5e7c3 | 2047 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2048 | struct kobject *ko; |
5e55e2f5 | 2049 | int err; |
1da177e4 | 2050 | |
11e2ede0 DW |
2051 | /* prevent duplicates */ |
2052 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2053 | return -EEXIST; | |
2054 | ||
dd8ac336 | 2055 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
f6b6ec5c SL |
2056 | if (!test_bit(Journal, &rdev->flags) && |
2057 | rdev->sectors && | |
2058 | (mddev->dev_sectors == 0 || rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2059 | if (mddev->pers) { |
2060 | /* Cannot change size, so fail | |
2061 | * If mddev->level <= 0, then we don't care | |
2062 | * about aligning sizes (e.g. linear) | |
2063 | */ | |
2064 | if (mddev->level > 0) | |
2065 | return -ENOSPC; | |
2066 | } else | |
dd8ac336 | 2067 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2068 | } |
1da177e4 LT |
2069 | |
2070 | /* Verify rdev->desc_nr is unique. | |
2071 | * If it is -1, assign a free number, else | |
2072 | * check number is not in use | |
2073 | */ | |
4878e9eb | 2074 | rcu_read_lock(); |
1da177e4 LT |
2075 | if (rdev->desc_nr < 0) { |
2076 | int choice = 0; | |
4878e9eb N |
2077 | if (mddev->pers) |
2078 | choice = mddev->raid_disks; | |
57d051dc | 2079 | while (md_find_rdev_nr_rcu(mddev, choice)) |
1da177e4 LT |
2080 | choice++; |
2081 | rdev->desc_nr = choice; | |
2082 | } else { | |
57d051dc | 2083 | if (md_find_rdev_nr_rcu(mddev, rdev->desc_nr)) { |
4878e9eb | 2084 | rcu_read_unlock(); |
1da177e4 | 2085 | return -EBUSY; |
4878e9eb | 2086 | } |
1da177e4 | 2087 | } |
4878e9eb | 2088 | rcu_read_unlock(); |
f6b6ec5c SL |
2089 | if (!test_bit(Journal, &rdev->flags) && |
2090 | mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { | |
de01dfad N |
2091 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", |
2092 | mdname(mddev), mddev->max_disks); | |
2093 | return -EBUSY; | |
2094 | } | |
19133a42 | 2095 | bdevname(rdev->bdev,b); |
90a9befb | 2096 | strreplace(b, '/', '!'); |
649316b2 | 2097 | |
1da177e4 | 2098 | rdev->mddev = mddev; |
19133a42 | 2099 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2100 | |
b2d6db58 | 2101 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2102 | goto fail; |
86e6ffdd | 2103 | |
0762b8bd | 2104 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2105 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2106 | /* failure here is OK */; | |
2107 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2108 | |
4b80991c | 2109 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2110 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2111 | |
2112 | /* May as well allow recovery to be retried once */ | |
5389042f | 2113 | mddev->recovery_disabled++; |
3f9d99c1 | 2114 | |
1da177e4 | 2115 | return 0; |
5e55e2f5 N |
2116 | |
2117 | fail: | |
2118 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2119 | b, mdname(mddev)); | |
2120 | return err; | |
1da177e4 LT |
2121 | } |
2122 | ||
177a99b2 | 2123 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2124 | { |
3cb03002 | 2125 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2126 | kobject_del(&rdev->kobj); |
177a99b2 | 2127 | kobject_put(&rdev->kobj); |
5792a285 N |
2128 | } |
2129 | ||
f72ffdd6 | 2130 | static void unbind_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2131 | { |
2132 | char b[BDEVNAME_SIZE]; | |
403df478 | 2133 | |
49731baa | 2134 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2135 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2136 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2137 | rdev->mddev = NULL; | |
86e6ffdd | 2138 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2139 | sysfs_put(rdev->sysfs_state); |
2140 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2141 | rdev->badblocks.count = 0; |
5792a285 | 2142 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2143 | * writing to 'remove' to "dev/state". We also need |
2144 | * to delay it due to rcu usage. | |
5792a285 | 2145 | */ |
4b80991c | 2146 | synchronize_rcu(); |
177a99b2 N |
2147 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2148 | kobject_get(&rdev->kobj); | |
e804ac78 | 2149 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2150 | } |
2151 | ||
2152 | /* | |
2153 | * prevent the device from being mounted, repartitioned or | |
2154 | * otherwise reused by a RAID array (or any other kernel | |
2155 | * subsystem), by bd_claiming the device. | |
2156 | */ | |
3cb03002 | 2157 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2158 | { |
2159 | int err = 0; | |
2160 | struct block_device *bdev; | |
2161 | char b[BDEVNAME_SIZE]; | |
2162 | ||
d4d77629 | 2163 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2164 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2165 | if (IS_ERR(bdev)) { |
2166 | printk(KERN_ERR "md: could not open %s.\n", | |
2167 | __bdevname(dev, b)); | |
2168 | return PTR_ERR(bdev); | |
2169 | } | |
1da177e4 LT |
2170 | rdev->bdev = bdev; |
2171 | return err; | |
2172 | } | |
2173 | ||
3cb03002 | 2174 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2175 | { |
2176 | struct block_device *bdev = rdev->bdev; | |
2177 | rdev->bdev = NULL; | |
e525fd89 | 2178 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2179 | } |
2180 | ||
2181 | void md_autodetect_dev(dev_t dev); | |
2182 | ||
f72ffdd6 | 2183 | static void export_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2184 | { |
2185 | char b[BDEVNAME_SIZE]; | |
403df478 | 2186 | |
1da177e4 LT |
2187 | printk(KERN_INFO "md: export_rdev(%s)\n", |
2188 | bdevname(rdev->bdev,b)); | |
545c8795 | 2189 | md_rdev_clear(rdev); |
1da177e4 | 2190 | #ifndef MODULE |
d0fae18f N |
2191 | if (test_bit(AutoDetected, &rdev->flags)) |
2192 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2193 | #endif |
2194 | unlock_rdev(rdev); | |
86e6ffdd | 2195 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2196 | } |
2197 | ||
fb56dfef | 2198 | void md_kick_rdev_from_array(struct md_rdev *rdev) |
1da177e4 LT |
2199 | { |
2200 | unbind_rdev_from_array(rdev); | |
2201 | export_rdev(rdev); | |
2202 | } | |
fb56dfef | 2203 | EXPORT_SYMBOL_GPL(md_kick_rdev_from_array); |
1da177e4 | 2204 | |
fd01b88c | 2205 | static void export_array(struct mddev *mddev) |
1da177e4 | 2206 | { |
0638bb0e | 2207 | struct md_rdev *rdev; |
1da177e4 | 2208 | |
0638bb0e N |
2209 | while (!list_empty(&mddev->disks)) { |
2210 | rdev = list_first_entry(&mddev->disks, struct md_rdev, | |
2211 | same_set); | |
fb56dfef | 2212 | md_kick_rdev_from_array(rdev); |
1da177e4 | 2213 | } |
1da177e4 LT |
2214 | mddev->raid_disks = 0; |
2215 | mddev->major_version = 0; | |
2216 | } | |
2217 | ||
f72ffdd6 | 2218 | static void sync_sbs(struct mddev *mddev, int nospares) |
1da177e4 | 2219 | { |
42543769 N |
2220 | /* Update each superblock (in-memory image), but |
2221 | * if we are allowed to, skip spares which already | |
2222 | * have the right event counter, or have one earlier | |
2223 | * (which would mean they aren't being marked as dirty | |
2224 | * with the rest of the array) | |
2225 | */ | |
3cb03002 | 2226 | struct md_rdev *rdev; |
dafb20fa | 2227 | rdev_for_each(rdev, mddev) { |
42543769 N |
2228 | if (rdev->sb_events == mddev->events || |
2229 | (nospares && | |
2230 | rdev->raid_disk < 0 && | |
42543769 N |
2231 | rdev->sb_events+1 == mddev->events)) { |
2232 | /* Don't update this superblock */ | |
2233 | rdev->sb_loaded = 2; | |
2234 | } else { | |
076f968b | 2235 | sync_super(mddev, rdev); |
42543769 N |
2236 | rdev->sb_loaded = 1; |
2237 | } | |
1da177e4 LT |
2238 | } |
2239 | } | |
2240 | ||
2aa82191 GR |
2241 | static bool does_sb_need_changing(struct mddev *mddev) |
2242 | { | |
2243 | struct md_rdev *rdev; | |
2244 | struct mdp_superblock_1 *sb; | |
2245 | int role; | |
2246 | ||
2247 | /* Find a good rdev */ | |
2248 | rdev_for_each(rdev, mddev) | |
2249 | if ((rdev->raid_disk >= 0) && !test_bit(Faulty, &rdev->flags)) | |
2250 | break; | |
2251 | ||
2252 | /* No good device found. */ | |
2253 | if (!rdev) | |
2254 | return false; | |
2255 | ||
2256 | sb = page_address(rdev->sb_page); | |
2257 | /* Check if a device has become faulty or a spare become active */ | |
2258 | rdev_for_each(rdev, mddev) { | |
2259 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
2260 | /* Device activated? */ | |
2261 | if (role == 0xffff && rdev->raid_disk >=0 && | |
2262 | !test_bit(Faulty, &rdev->flags)) | |
2263 | return true; | |
2264 | /* Device turned faulty? */ | |
2265 | if (test_bit(Faulty, &rdev->flags) && (role < 0xfffd)) | |
2266 | return true; | |
2267 | } | |
2268 | ||
2269 | /* Check if any mddev parameters have changed */ | |
2270 | if ((mddev->dev_sectors != le64_to_cpu(sb->size)) || | |
2271 | (mddev->reshape_position != le64_to_cpu(sb->reshape_position)) || | |
2aa82191 GR |
2272 | (mddev->layout != le64_to_cpu(sb->layout)) || |
2273 | (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) || | |
2274 | (mddev->chunk_sectors != le32_to_cpu(sb->chunksize))) | |
2275 | return true; | |
2276 | ||
2277 | return false; | |
2278 | } | |
2279 | ||
1aee41f6 | 2280 | void md_update_sb(struct mddev *mddev, int force_change) |
1da177e4 | 2281 | { |
3cb03002 | 2282 | struct md_rdev *rdev; |
06d91a5f | 2283 | int sync_req; |
42543769 | 2284 | int nospares = 0; |
2699b672 | 2285 | int any_badblocks_changed = 0; |
23b63f9f | 2286 | int ret = -1; |
1da177e4 | 2287 | |
d87f064f N |
2288 | if (mddev->ro) { |
2289 | if (force_change) | |
2290 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2291 | return; | |
2292 | } | |
2aa82191 | 2293 | |
2c97cf13 | 2294 | repeat: |
2aa82191 GR |
2295 | if (mddev_is_clustered(mddev)) { |
2296 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
2297 | force_change = 1; | |
23b63f9f | 2298 | ret = md_cluster_ops->metadata_update_start(mddev); |
2aa82191 GR |
2299 | /* Has someone else has updated the sb */ |
2300 | if (!does_sb_need_changing(mddev)) { | |
23b63f9f GJ |
2301 | if (ret == 0) |
2302 | md_cluster_ops->metadata_update_cancel(mddev); | |
2aa82191 GR |
2303 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
2304 | return; | |
2305 | } | |
2306 | } | |
2c97cf13 | 2307 | |
3a3a5ddb | 2308 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2309 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2310 | if (rdev->raid_disk >= 0 && |
2311 | mddev->delta_disks >= 0 && | |
f2076e7d | 2312 | !test_bit(Journal, &rdev->flags) && |
3a3a5ddb N |
2313 | !test_bit(In_sync, &rdev->flags) && |
2314 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2315 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2316 | ||
f72ffdd6 | 2317 | } |
bd52b746 | 2318 | if (!mddev->persistent) { |
070dc6dd | 2319 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2320 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2321 | if (!mddev->external) { |
d97a41dc | 2322 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2323 | rdev_for_each(rdev, mddev) { |
de393cde | 2324 | if (rdev->badblocks.changed) { |
d0962936 | 2325 | rdev->badblocks.changed = 0; |
fc974ee2 | 2326 | ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2327 | md_error(mddev, rdev); |
2328 | } | |
2329 | clear_bit(Blocked, &rdev->flags); | |
2330 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2331 | wake_up(&rdev->blocked_wait); | |
2332 | } | |
2333 | } | |
3a3a5ddb N |
2334 | wake_up(&mddev->sb_wait); |
2335 | return; | |
2336 | } | |
2337 | ||
85572d7c | 2338 | spin_lock(&mddev->lock); |
84692195 | 2339 | |
9ebc6ef1 | 2340 | mddev->utime = ktime_get_real_seconds(); |
3a3a5ddb | 2341 | |
850b2b42 N |
2342 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2343 | force_change = 1; | |
2344 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2345 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2346 | * though if events isn't the right even/odd, we will have to do | |
2347 | * spares after all | |
2348 | */ | |
2349 | nospares = 1; | |
2350 | if (force_change) | |
2351 | nospares = 0; | |
2352 | if (mddev->degraded) | |
84692195 N |
2353 | /* If the array is degraded, then skipping spares is both |
2354 | * dangerous and fairly pointless. | |
2355 | * Dangerous because a device that was removed from the array | |
2356 | * might have a event_count that still looks up-to-date, | |
2357 | * so it can be re-added without a resync. | |
2358 | * Pointless because if there are any spares to skip, | |
2359 | * then a recovery will happen and soon that array won't | |
2360 | * be degraded any more and the spare can go back to sleep then. | |
2361 | */ | |
850b2b42 | 2362 | nospares = 0; |
84692195 | 2363 | |
06d91a5f | 2364 | sync_req = mddev->in_sync; |
42543769 N |
2365 | |
2366 | /* If this is just a dirty<->clean transition, and the array is clean | |
2367 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2368 | if (nospares |
42543769 | 2369 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2370 | && mddev->can_decrease_events |
2371 | && mddev->events != 1) { | |
42543769 | 2372 | mddev->events--; |
a8707c08 N |
2373 | mddev->can_decrease_events = 0; |
2374 | } else { | |
42543769 N |
2375 | /* otherwise we have to go forward and ... */ |
2376 | mddev->events ++; | |
a8707c08 | 2377 | mddev->can_decrease_events = nospares; |
42543769 | 2378 | } |
1da177e4 | 2379 | |
403df478 N |
2380 | /* |
2381 | * This 64-bit counter should never wrap. | |
2382 | * Either we are in around ~1 trillion A.C., assuming | |
2383 | * 1 reboot per second, or we have a bug... | |
2384 | */ | |
2385 | WARN_ON(mddev->events == 0); | |
2699b672 | 2386 | |
dafb20fa | 2387 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2388 | if (rdev->badblocks.changed) |
2389 | any_badblocks_changed++; | |
de393cde N |
2390 | if (test_bit(Faulty, &rdev->flags)) |
2391 | set_bit(FaultRecorded, &rdev->flags); | |
2392 | } | |
2699b672 | 2393 | |
e691063a | 2394 | sync_sbs(mddev, nospares); |
85572d7c | 2395 | spin_unlock(&mddev->lock); |
1da177e4 | 2396 | |
36a4e1fe N |
2397 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2398 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2399 | |
4ad13663 | 2400 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2401 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2402 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2403 | |
42543769 N |
2404 | if (rdev->sb_loaded != 1) |
2405 | continue; /* no noise on spare devices */ | |
1da177e4 | 2406 | |
f466722c | 2407 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2408 | md_super_write(mddev,rdev, |
0f420358 | 2409 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2410 | rdev->sb_page); |
36a4e1fe N |
2411 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2412 | bdevname(rdev->bdev, b), | |
2413 | (unsigned long long)rdev->sb_start); | |
42543769 | 2414 | rdev->sb_events = mddev->events; |
2699b672 N |
2415 | if (rdev->badblocks.size) { |
2416 | md_super_write(mddev, rdev, | |
2417 | rdev->badblocks.sector, | |
2418 | rdev->badblocks.size << 9, | |
2419 | rdev->bb_page); | |
2420 | rdev->badblocks.size = 0; | |
2421 | } | |
7bfa19f2 | 2422 | |
f466722c | 2423 | } else |
36a4e1fe N |
2424 | pr_debug("md: %s (skipping faulty)\n", |
2425 | bdevname(rdev->bdev, b)); | |
d70ed2e4 | 2426 | |
7bfa19f2 | 2427 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2428 | /* only need to write one superblock... */ |
2429 | break; | |
2430 | } | |
a9701a30 | 2431 | md_super_wait(mddev); |
850b2b42 | 2432 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2433 | |
2c97cf13 GJ |
2434 | if (mddev_is_clustered(mddev) && ret == 0) |
2435 | md_cluster_ops->metadata_update_finish(mddev); | |
2436 | ||
85572d7c | 2437 | spin_lock(&mddev->lock); |
850b2b42 N |
2438 | if (mddev->in_sync != sync_req || |
2439 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2440 | /* have to write it out again */ |
85572d7c | 2441 | spin_unlock(&mddev->lock); |
06d91a5f N |
2442 | goto repeat; |
2443 | } | |
850b2b42 | 2444 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
85572d7c | 2445 | spin_unlock(&mddev->lock); |
3d310eb7 | 2446 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2447 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2448 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2449 | |
dafb20fa | 2450 | rdev_for_each(rdev, mddev) { |
de393cde N |
2451 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2452 | clear_bit(Blocked, &rdev->flags); | |
2453 | ||
2454 | if (any_badblocks_changed) | |
fc974ee2 | 2455 | ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2456 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2457 | wake_up(&rdev->blocked_wait); | |
2458 | } | |
1da177e4 | 2459 | } |
1aee41f6 | 2460 | EXPORT_SYMBOL(md_update_sb); |
1da177e4 | 2461 | |
a6da4ef8 GR |
2462 | static int add_bound_rdev(struct md_rdev *rdev) |
2463 | { | |
2464 | struct mddev *mddev = rdev->mddev; | |
2465 | int err = 0; | |
87d4d916 | 2466 | bool add_journal = test_bit(Journal, &rdev->flags); |
a6da4ef8 | 2467 | |
87d4d916 | 2468 | if (!mddev->pers->hot_remove_disk || add_journal) { |
a6da4ef8 GR |
2469 | /* If there is hot_add_disk but no hot_remove_disk |
2470 | * then added disks for geometry changes, | |
2471 | * and should be added immediately. | |
2472 | */ | |
2473 | super_types[mddev->major_version]. | |
2474 | validate_super(mddev, rdev); | |
87d4d916 SL |
2475 | if (add_journal) |
2476 | mddev_suspend(mddev); | |
a6da4ef8 | 2477 | err = mddev->pers->hot_add_disk(mddev, rdev); |
87d4d916 SL |
2478 | if (add_journal) |
2479 | mddev_resume(mddev); | |
a6da4ef8 GR |
2480 | if (err) { |
2481 | unbind_rdev_from_array(rdev); | |
2482 | export_rdev(rdev); | |
2483 | return err; | |
2484 | } | |
2485 | } | |
2486 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
2487 | ||
2488 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2489 | if (mddev->degraded) | |
2490 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
2491 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2492 | md_new_event(mddev); | |
2493 | md_wakeup_thread(mddev->thread); | |
2494 | return 0; | |
2495 | } | |
1da177e4 | 2496 | |
7f6ce769 | 2497 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2498 | * We want to accept with case. For this we use cmd_match. |
2499 | */ | |
2500 | static int cmd_match(const char *cmd, const char *str) | |
2501 | { | |
2502 | /* See if cmd, written into a sysfs file, matches | |
2503 | * str. They must either be the same, or cmd can | |
2504 | * have a trailing newline | |
2505 | */ | |
2506 | while (*cmd && *str && *cmd == *str) { | |
2507 | cmd++; | |
2508 | str++; | |
2509 | } | |
2510 | if (*cmd == '\n') | |
2511 | cmd++; | |
2512 | if (*str || *cmd) | |
2513 | return 0; | |
2514 | return 1; | |
2515 | } | |
2516 | ||
86e6ffdd N |
2517 | struct rdev_sysfs_entry { |
2518 | struct attribute attr; | |
3cb03002 N |
2519 | ssize_t (*show)(struct md_rdev *, char *); |
2520 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2521 | }; |
2522 | ||
2523 | static ssize_t | |
3cb03002 | 2524 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2525 | { |
2526 | char *sep = ""; | |
20a49ff6 | 2527 | size_t len = 0; |
758bfc8a | 2528 | unsigned long flags = ACCESS_ONCE(rdev->flags); |
86e6ffdd | 2529 | |
758bfc8a | 2530 | if (test_bit(Faulty, &flags) || |
de393cde | 2531 | rdev->badblocks.unacked_exist) { |
86e6ffdd N |
2532 | len+= sprintf(page+len, "%sfaulty",sep); |
2533 | sep = ","; | |
2534 | } | |
758bfc8a | 2535 | if (test_bit(In_sync, &flags)) { |
86e6ffdd N |
2536 | len += sprintf(page+len, "%sin_sync",sep); |
2537 | sep = ","; | |
2538 | } | |
ac6096e9 SL |
2539 | if (test_bit(Journal, &flags)) { |
2540 | len += sprintf(page+len, "%sjournal",sep); | |
2541 | sep = ","; | |
2542 | } | |
758bfc8a | 2543 | if (test_bit(WriteMostly, &flags)) { |
f655675b N |
2544 | len += sprintf(page+len, "%swrite_mostly",sep); |
2545 | sep = ","; | |
2546 | } | |
758bfc8a | 2547 | if (test_bit(Blocked, &flags) || |
52c64152 | 2548 | (rdev->badblocks.unacked_exist |
758bfc8a | 2549 | && !test_bit(Faulty, &flags))) { |
6bfe0b49 DW |
2550 | len += sprintf(page+len, "%sblocked", sep); |
2551 | sep = ","; | |
2552 | } | |
758bfc8a | 2553 | if (!test_bit(Faulty, &flags) && |
f2076e7d | 2554 | !test_bit(Journal, &flags) && |
758bfc8a | 2555 | !test_bit(In_sync, &flags)) { |
86e6ffdd N |
2556 | len += sprintf(page+len, "%sspare", sep); |
2557 | sep = ","; | |
2558 | } | |
758bfc8a | 2559 | if (test_bit(WriteErrorSeen, &flags)) { |
d7a9d443 N |
2560 | len += sprintf(page+len, "%swrite_error", sep); |
2561 | sep = ","; | |
2562 | } | |
758bfc8a | 2563 | if (test_bit(WantReplacement, &flags)) { |
2d78f8c4 N |
2564 | len += sprintf(page+len, "%swant_replacement", sep); |
2565 | sep = ","; | |
2566 | } | |
758bfc8a | 2567 | if (test_bit(Replacement, &flags)) { |
2d78f8c4 N |
2568 | len += sprintf(page+len, "%sreplacement", sep); |
2569 | sep = ","; | |
2570 | } | |
2571 | ||
86e6ffdd N |
2572 | return len+sprintf(page+len, "\n"); |
2573 | } | |
2574 | ||
45dc2de1 | 2575 | static ssize_t |
3cb03002 | 2576 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2577 | { |
2578 | /* can write | |
de393cde | 2579 | * faulty - simulates an error |
45dc2de1 | 2580 | * remove - disconnects the device |
f655675b N |
2581 | * writemostly - sets write_mostly |
2582 | * -writemostly - clears write_mostly | |
de393cde N |
2583 | * blocked - sets the Blocked flags |
2584 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2585 | * insync - sets Insync providing device isn't active |
f466722c N |
2586 | * -insync - clear Insync for a device with a slot assigned, |
2587 | * so that it gets rebuilt based on bitmap | |
d7a9d443 N |
2588 | * write_error - sets WriteErrorSeen |
2589 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2590 | */ |
2591 | int err = -EINVAL; | |
2592 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2593 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2594 | if (test_bit(Faulty, &rdev->flags)) |
2595 | err = 0; | |
2596 | else | |
2597 | err = -EBUSY; | |
45dc2de1 N |
2598 | } else if (cmd_match(buf, "remove")) { |
2599 | if (rdev->raid_disk >= 0) | |
2600 | err = -EBUSY; | |
2601 | else { | |
fd01b88c | 2602 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2603 | err = 0; |
a9720903 GJ |
2604 | if (mddev_is_clustered(mddev)) |
2605 | err = md_cluster_ops->remove_disk(mddev, rdev); | |
2606 | ||
2607 | if (err == 0) { | |
2608 | md_kick_rdev_from_array(rdev); | |
2609 | if (mddev->pers) | |
2610 | md_update_sb(mddev, 1); | |
2611 | md_new_event(mddev); | |
2612 | } | |
45dc2de1 | 2613 | } |
f655675b N |
2614 | } else if (cmd_match(buf, "writemostly")) { |
2615 | set_bit(WriteMostly, &rdev->flags); | |
2616 | err = 0; | |
2617 | } else if (cmd_match(buf, "-writemostly")) { | |
2618 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2619 | err = 0; |
2620 | } else if (cmd_match(buf, "blocked")) { | |
2621 | set_bit(Blocked, &rdev->flags); | |
2622 | err = 0; | |
2623 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2624 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2625 | rdev->badblocks.unacked_exist) { |
de393cde N |
2626 | /* metadata handler doesn't understand badblocks, |
2627 | * so we need to fail the device | |
2628 | */ | |
2629 | md_error(rdev->mddev, rdev); | |
2630 | } | |
6bfe0b49 | 2631 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2632 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2633 | wake_up(&rdev->blocked_wait); |
2634 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2635 | md_wakeup_thread(rdev->mddev->thread); | |
2636 | ||
6d56e278 N |
2637 | err = 0; |
2638 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2639 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2640 | err = 0; |
f2076e7d SL |
2641 | } else if (cmd_match(buf, "-insync") && rdev->raid_disk >= 0 && |
2642 | !test_bit(Journal, &rdev->flags)) { | |
e1960f8c N |
2643 | if (rdev->mddev->pers == NULL) { |
2644 | clear_bit(In_sync, &rdev->flags); | |
2645 | rdev->saved_raid_disk = rdev->raid_disk; | |
2646 | rdev->raid_disk = -1; | |
2647 | err = 0; | |
2648 | } | |
d7a9d443 N |
2649 | } else if (cmd_match(buf, "write_error")) { |
2650 | set_bit(WriteErrorSeen, &rdev->flags); | |
2651 | err = 0; | |
2652 | } else if (cmd_match(buf, "-write_error")) { | |
2653 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2654 | err = 0; | |
2d78f8c4 N |
2655 | } else if (cmd_match(buf, "want_replacement")) { |
2656 | /* Any non-spare device that is not a replacement can | |
2657 | * become want_replacement at any time, but we then need to | |
2658 | * check if recovery is needed. | |
2659 | */ | |
2660 | if (rdev->raid_disk >= 0 && | |
f2076e7d | 2661 | !test_bit(Journal, &rdev->flags) && |
2d78f8c4 N |
2662 | !test_bit(Replacement, &rdev->flags)) |
2663 | set_bit(WantReplacement, &rdev->flags); | |
2664 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2665 | md_wakeup_thread(rdev->mddev->thread); | |
2666 | err = 0; | |
2667 | } else if (cmd_match(buf, "-want_replacement")) { | |
2668 | /* Clearing 'want_replacement' is always allowed. | |
2669 | * Once replacements starts it is too late though. | |
2670 | */ | |
2671 | err = 0; | |
2672 | clear_bit(WantReplacement, &rdev->flags); | |
2673 | } else if (cmd_match(buf, "replacement")) { | |
2674 | /* Can only set a device as a replacement when array has not | |
2675 | * yet been started. Once running, replacement is automatic | |
2676 | * from spares, or by assigning 'slot'. | |
2677 | */ | |
2678 | if (rdev->mddev->pers) | |
2679 | err = -EBUSY; | |
2680 | else { | |
2681 | set_bit(Replacement, &rdev->flags); | |
2682 | err = 0; | |
2683 | } | |
2684 | } else if (cmd_match(buf, "-replacement")) { | |
2685 | /* Similarly, can only clear Replacement before start */ | |
2686 | if (rdev->mddev->pers) | |
2687 | err = -EBUSY; | |
2688 | else { | |
2689 | clear_bit(Replacement, &rdev->flags); | |
2690 | err = 0; | |
2691 | } | |
a6da4ef8 GR |
2692 | } else if (cmd_match(buf, "re-add")) { |
2693 | if (test_bit(Faulty, &rdev->flags) && (rdev->raid_disk == -1)) { | |
97f6cd39 GR |
2694 | /* clear_bit is performed _after_ all the devices |
2695 | * have their local Faulty bit cleared. If any writes | |
2696 | * happen in the meantime in the local node, they | |
2697 | * will land in the local bitmap, which will be synced | |
2698 | * by this node eventually | |
2699 | */ | |
2700 | if (!mddev_is_clustered(rdev->mddev) || | |
2701 | (err = md_cluster_ops->gather_bitmaps(rdev)) == 0) { | |
2702 | clear_bit(Faulty, &rdev->flags); | |
2703 | err = add_bound_rdev(rdev); | |
2704 | } | |
a6da4ef8 GR |
2705 | } else |
2706 | err = -EBUSY; | |
45dc2de1 | 2707 | } |
00bcb4ac N |
2708 | if (!err) |
2709 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2710 | return err ? err : len; |
2711 | } | |
80ca3a44 | 2712 | static struct rdev_sysfs_entry rdev_state = |
750f199e | 2713 | __ATTR_PREALLOC(state, S_IRUGO|S_IWUSR, state_show, state_store); |
86e6ffdd | 2714 | |
4dbcdc75 | 2715 | static ssize_t |
3cb03002 | 2716 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2717 | { |
2718 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2719 | } | |
2720 | ||
2721 | static ssize_t | |
3cb03002 | 2722 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 | 2723 | { |
4c9309c0 AD |
2724 | unsigned int n; |
2725 | int rv; | |
2726 | ||
2727 | rv = kstrtouint(buf, 10, &n); | |
2728 | if (rv < 0) | |
2729 | return rv; | |
2730 | atomic_set(&rdev->corrected_errors, n); | |
2731 | return len; | |
4dbcdc75 N |
2732 | } |
2733 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2734 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2735 | |
014236d2 | 2736 | static ssize_t |
3cb03002 | 2737 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 | 2738 | { |
f2076e7d SL |
2739 | if (test_bit(Journal, &rdev->flags)) |
2740 | return sprintf(page, "journal\n"); | |
2741 | else if (rdev->raid_disk < 0) | |
014236d2 N |
2742 | return sprintf(page, "none\n"); |
2743 | else | |
2744 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2745 | } | |
2746 | ||
2747 | static ssize_t | |
3cb03002 | 2748 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 | 2749 | { |
4c9309c0 | 2750 | int slot; |
c303da6d | 2751 | int err; |
4c9309c0 | 2752 | |
f2076e7d SL |
2753 | if (test_bit(Journal, &rdev->flags)) |
2754 | return -EBUSY; | |
014236d2 N |
2755 | if (strncmp(buf, "none", 4)==0) |
2756 | slot = -1; | |
4c9309c0 AD |
2757 | else { |
2758 | err = kstrtouint(buf, 10, (unsigned int *)&slot); | |
2759 | if (err < 0) | |
2760 | return err; | |
2761 | } | |
6c2fce2e | 2762 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2763 | /* Setting 'slot' on an active array requires also |
2764 | * updating the 'rd%d' link, and communicating | |
2765 | * with the personality with ->hot_*_disk. | |
2766 | * For now we only support removing | |
2767 | * failed/spare devices. This normally happens automatically, | |
2768 | * but not when the metadata is externally managed. | |
2769 | */ | |
c303da6d N |
2770 | if (rdev->raid_disk == -1) |
2771 | return -EEXIST; | |
2772 | /* personality does all needed checks */ | |
01393f3d | 2773 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2774 | return -EINVAL; |
746d3207 N |
2775 | clear_bit(Blocked, &rdev->flags); |
2776 | remove_and_add_spares(rdev->mddev, rdev); | |
2777 | if (rdev->raid_disk >= 0) | |
2778 | return -EBUSY; | |
c303da6d N |
2779 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2780 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2781 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2782 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2783 | * if we ever get bitmaps working here. |
6c2fce2e | 2784 | */ |
cb01c549 | 2785 | int err; |
6c2fce2e NB |
2786 | |
2787 | if (rdev->raid_disk != -1) | |
2788 | return -EBUSY; | |
2789 | ||
c6751b2b N |
2790 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2791 | return -EBUSY; | |
2792 | ||
6c2fce2e NB |
2793 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2794 | return -EINVAL; | |
2795 | ||
ba1b41b6 N |
2796 | if (slot >= rdev->mddev->raid_disks && |
2797 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2798 | return -ENOSPC; | |
2799 | ||
6c2fce2e NB |
2800 | rdev->raid_disk = slot; |
2801 | if (test_bit(In_sync, &rdev->flags)) | |
2802 | rdev->saved_raid_disk = slot; | |
2803 | else | |
2804 | rdev->saved_raid_disk = -1; | |
d30519fc | 2805 | clear_bit(In_sync, &rdev->flags); |
8313b8e5 | 2806 | clear_bit(Bitmap_sync, &rdev->flags); |
cb01c549 GR |
2807 | err = rdev->mddev->pers-> |
2808 | hot_add_disk(rdev->mddev, rdev); | |
2809 | if (err) { | |
2810 | rdev->raid_disk = -1; | |
2811 | return err; | |
2812 | } else | |
2813 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
2814 | if (sysfs_link_rdev(rdev->mddev, rdev)) | |
2815 | /* failure here is OK */; | |
6c2fce2e | 2816 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2817 | } else { |
ba1b41b6 N |
2818 | if (slot >= rdev->mddev->raid_disks && |
2819 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2820 | return -ENOSPC; |
2821 | rdev->raid_disk = slot; | |
2822 | /* assume it is working */ | |
c5d79adb N |
2823 | clear_bit(Faulty, &rdev->flags); |
2824 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2825 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2826 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2827 | } |
014236d2 N |
2828 | return len; |
2829 | } | |
2830 | ||
014236d2 | 2831 | static struct rdev_sysfs_entry rdev_slot = |
80ca3a44 | 2832 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2833 | |
93c8cad0 | 2834 | static ssize_t |
3cb03002 | 2835 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2836 | { |
6961ece4 | 2837 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2838 | } |
2839 | ||
2840 | static ssize_t | |
3cb03002 | 2841 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2842 | { |
c6563a8c | 2843 | unsigned long long offset; |
b29bebd6 | 2844 | if (kstrtoull(buf, 10, &offset) < 0) |
93c8cad0 | 2845 | return -EINVAL; |
8ed0a521 | 2846 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2847 | return -EBUSY; |
dd8ac336 | 2848 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2849 | /* Must set offset before size, so overlap checks |
2850 | * can be sane */ | |
2851 | return -EBUSY; | |
93c8cad0 | 2852 | rdev->data_offset = offset; |
25f7fd47 | 2853 | rdev->new_data_offset = offset; |
93c8cad0 N |
2854 | return len; |
2855 | } | |
2856 | ||
2857 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2858 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2859 | |
c6563a8c N |
2860 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2861 | { | |
2862 | return sprintf(page, "%llu\n", | |
2863 | (unsigned long long)rdev->new_data_offset); | |
2864 | } | |
2865 | ||
2866 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2867 | const char *buf, size_t len) | |
2868 | { | |
2869 | unsigned long long new_offset; | |
2870 | struct mddev *mddev = rdev->mddev; | |
2871 | ||
b29bebd6 | 2872 | if (kstrtoull(buf, 10, &new_offset) < 0) |
c6563a8c N |
2873 | return -EINVAL; |
2874 | ||
f851b60d N |
2875 | if (mddev->sync_thread || |
2876 | test_bit(MD_RECOVERY_RUNNING,&mddev->recovery)) | |
c6563a8c N |
2877 | return -EBUSY; |
2878 | if (new_offset == rdev->data_offset) | |
2879 | /* reset is always permitted */ | |
2880 | ; | |
2881 | else if (new_offset > rdev->data_offset) { | |
2882 | /* must not push array size beyond rdev_sectors */ | |
2883 | if (new_offset - rdev->data_offset | |
2884 | + mddev->dev_sectors > rdev->sectors) | |
2885 | return -E2BIG; | |
2886 | } | |
2887 | /* Metadata worries about other space details. */ | |
2888 | ||
2889 | /* decreasing the offset is inconsistent with a backwards | |
2890 | * reshape. | |
2891 | */ | |
2892 | if (new_offset < rdev->data_offset && | |
2893 | mddev->reshape_backwards) | |
2894 | return -EINVAL; | |
2895 | /* Increasing offset is inconsistent with forwards | |
2896 | * reshape. reshape_direction should be set to | |
2897 | * 'backwards' first. | |
2898 | */ | |
2899 | if (new_offset > rdev->data_offset && | |
2900 | !mddev->reshape_backwards) | |
2901 | return -EINVAL; | |
2902 | ||
2903 | if (mddev->pers && mddev->persistent && | |
2904 | !super_types[mddev->major_version] | |
2905 | .allow_new_offset(rdev, new_offset)) | |
2906 | return -E2BIG; | |
2907 | rdev->new_data_offset = new_offset; | |
2908 | if (new_offset > rdev->data_offset) | |
2909 | mddev->reshape_backwards = 1; | |
2910 | else if (new_offset < rdev->data_offset) | |
2911 | mddev->reshape_backwards = 0; | |
2912 | ||
2913 | return len; | |
2914 | } | |
2915 | static struct rdev_sysfs_entry rdev_new_offset = | |
2916 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2917 | ||
83303b61 | 2918 | static ssize_t |
3cb03002 | 2919 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2920 | { |
dd8ac336 | 2921 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2922 | } |
2923 | ||
c5d79adb N |
2924 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2925 | { | |
2926 | /* check if two start/length pairs overlap */ | |
2927 | if (s1+l1 <= s2) | |
2928 | return 0; | |
2929 | if (s2+l2 <= s1) | |
2930 | return 0; | |
2931 | return 1; | |
2932 | } | |
2933 | ||
b522adcd DW |
2934 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2935 | { | |
2936 | unsigned long long blocks; | |
2937 | sector_t new; | |
2938 | ||
b29bebd6 | 2939 | if (kstrtoull(buf, 10, &blocks) < 0) |
b522adcd DW |
2940 | return -EINVAL; |
2941 | ||
2942 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2943 | return -EINVAL; /* sector conversion overflow */ | |
2944 | ||
2945 | new = blocks * 2; | |
2946 | if (new != blocks * 2) | |
2947 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2948 | ||
2949 | *sectors = new; | |
2950 | return 0; | |
2951 | } | |
2952 | ||
83303b61 | 2953 | static ssize_t |
3cb03002 | 2954 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2955 | { |
fd01b88c | 2956 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2957 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2958 | sector_t sectors; |
27c529bb | 2959 | |
f2076e7d SL |
2960 | if (test_bit(Journal, &rdev->flags)) |
2961 | return -EBUSY; | |
b522adcd | 2962 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2963 | return -EINVAL; |
c6563a8c N |
2964 | if (rdev->data_offset != rdev->new_data_offset) |
2965 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2966 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2967 | if (my_mddev->persistent) { |
dd8ac336 AN |
2968 | sectors = super_types[my_mddev->major_version]. |
2969 | rdev_size_change(rdev, sectors); | |
2970 | if (!sectors) | |
0cd17fec | 2971 | return -EBUSY; |
dd8ac336 | 2972 | } else if (!sectors) |
77304d2a | 2973 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2974 | rdev->data_offset; |
a6468539 N |
2975 | if (!my_mddev->pers->resize) |
2976 | /* Cannot change size for RAID0 or Linear etc */ | |
2977 | return -EINVAL; | |
0cd17fec | 2978 | } |
dd8ac336 | 2979 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2980 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2981 | |
dd8ac336 AN |
2982 | rdev->sectors = sectors; |
2983 | if (sectors > oldsectors && my_mddev->external) { | |
8b1afc3d N |
2984 | /* Need to check that all other rdevs with the same |
2985 | * ->bdev do not overlap. 'rcu' is sufficient to walk | |
2986 | * the rdev lists safely. | |
2987 | * This check does not provide a hard guarantee, it | |
2988 | * just helps avoid dangerous mistakes. | |
c5d79adb | 2989 | */ |
fd01b88c | 2990 | struct mddev *mddev; |
c5d79adb | 2991 | int overlap = 0; |
159ec1fc | 2992 | struct list_head *tmp; |
c5d79adb | 2993 | |
8b1afc3d | 2994 | rcu_read_lock(); |
29ac4aa3 | 2995 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2996 | struct md_rdev *rdev2; |
c5d79adb | 2997 | |
dafb20fa | 2998 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
2999 | if (rdev->bdev == rdev2->bdev && |
3000 | rdev != rdev2 && | |
3001 | overlaps(rdev->data_offset, rdev->sectors, | |
3002 | rdev2->data_offset, | |
3003 | rdev2->sectors)) { | |
c5d79adb N |
3004 | overlap = 1; |
3005 | break; | |
3006 | } | |
c5d79adb N |
3007 | if (overlap) { |
3008 | mddev_put(mddev); | |
3009 | break; | |
3010 | } | |
3011 | } | |
8b1afc3d | 3012 | rcu_read_unlock(); |
c5d79adb N |
3013 | if (overlap) { |
3014 | /* Someone else could have slipped in a size | |
3015 | * change here, but doing so is just silly. | |
dd8ac336 | 3016 | * We put oldsectors back because we *know* it is |
c5d79adb N |
3017 | * safe, and trust userspace not to race with |
3018 | * itself | |
3019 | */ | |
dd8ac336 | 3020 | rdev->sectors = oldsectors; |
c5d79adb N |
3021 | return -EBUSY; |
3022 | } | |
3023 | } | |
83303b61 N |
3024 | return len; |
3025 | } | |
3026 | ||
3027 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 3028 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 3029 | |
3cb03002 | 3030 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
3031 | { |
3032 | unsigned long long recovery_start = rdev->recovery_offset; | |
3033 | ||
3034 | if (test_bit(In_sync, &rdev->flags) || | |
3035 | recovery_start == MaxSector) | |
3036 | return sprintf(page, "none\n"); | |
3037 | ||
3038 | return sprintf(page, "%llu\n", recovery_start); | |
3039 | } | |
3040 | ||
3cb03002 | 3041 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
3042 | { |
3043 | unsigned long long recovery_start; | |
3044 | ||
3045 | if (cmd_match(buf, "none")) | |
3046 | recovery_start = MaxSector; | |
b29bebd6 | 3047 | else if (kstrtoull(buf, 10, &recovery_start)) |
06e3c817 DW |
3048 | return -EINVAL; |
3049 | ||
3050 | if (rdev->mddev->pers && | |
3051 | rdev->raid_disk >= 0) | |
3052 | return -EBUSY; | |
3053 | ||
3054 | rdev->recovery_offset = recovery_start; | |
3055 | if (recovery_start == MaxSector) | |
3056 | set_bit(In_sync, &rdev->flags); | |
3057 | else | |
3058 | clear_bit(In_sync, &rdev->flags); | |
3059 | return len; | |
3060 | } | |
3061 | ||
3062 | static struct rdev_sysfs_entry rdev_recovery_start = | |
3063 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
3064 | ||
fc974ee2 VV |
3065 | /* sysfs access to bad-blocks list. |
3066 | * We present two files. | |
3067 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
3068 | * are recorded as bad. The list is truncated to fit within | |
3069 | * the one-page limit of sysfs. | |
3070 | * Writing "sector length" to this file adds an acknowledged | |
3071 | * bad block list. | |
3072 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
3073 | * been acknowledged. Writing to this file adds bad blocks | |
3074 | * without acknowledging them. This is largely for testing. | |
3075 | */ | |
3cb03002 | 3076 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3077 | { |
3078 | return badblocks_show(&rdev->badblocks, page, 0); | |
3079 | } | |
3cb03002 | 3080 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 3081 | { |
de393cde N |
3082 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
3083 | /* Maybe that ack was all we needed */ | |
3084 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
3085 | wake_up(&rdev->blocked_wait); | |
3086 | return rv; | |
16c791a5 N |
3087 | } |
3088 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
3089 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
3090 | ||
3cb03002 | 3091 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3092 | { |
3093 | return badblocks_show(&rdev->badblocks, page, 1); | |
3094 | } | |
3cb03002 | 3095 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
3096 | { |
3097 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
3098 | } | |
3099 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
3100 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
3101 | ||
86e6ffdd N |
3102 | static struct attribute *rdev_default_attrs[] = { |
3103 | &rdev_state.attr, | |
4dbcdc75 | 3104 | &rdev_errors.attr, |
014236d2 | 3105 | &rdev_slot.attr, |
93c8cad0 | 3106 | &rdev_offset.attr, |
c6563a8c | 3107 | &rdev_new_offset.attr, |
83303b61 | 3108 | &rdev_size.attr, |
06e3c817 | 3109 | &rdev_recovery_start.attr, |
16c791a5 N |
3110 | &rdev_bad_blocks.attr, |
3111 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
3112 | NULL, |
3113 | }; | |
3114 | static ssize_t | |
3115 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3116 | { | |
3117 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3118 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
86e6ffdd N |
3119 | |
3120 | if (!entry->show) | |
3121 | return -EIO; | |
758bfc8a N |
3122 | if (!rdev->mddev) |
3123 | return -EBUSY; | |
3124 | return entry->show(rdev, page); | |
86e6ffdd N |
3125 | } |
3126 | ||
3127 | static ssize_t | |
3128 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
3129 | const char *page, size_t length) | |
3130 | { | |
3131 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3132 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 3133 | ssize_t rv; |
fd01b88c | 3134 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
3135 | |
3136 | if (!entry->store) | |
3137 | return -EIO; | |
67463acb N |
3138 | if (!capable(CAP_SYS_ADMIN)) |
3139 | return -EACCES; | |
27c529bb | 3140 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 3141 | if (!rv) { |
27c529bb N |
3142 | if (rdev->mddev == NULL) |
3143 | rv = -EBUSY; | |
3144 | else | |
3145 | rv = entry->store(rdev, page, length); | |
6a51830e | 3146 | mddev_unlock(mddev); |
ca388059 N |
3147 | } |
3148 | return rv; | |
86e6ffdd N |
3149 | } |
3150 | ||
3151 | static void rdev_free(struct kobject *ko) | |
3152 | { | |
3cb03002 | 3153 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3154 | kfree(rdev); |
3155 | } | |
52cf25d0 | 3156 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3157 | .show = rdev_attr_show, |
3158 | .store = rdev_attr_store, | |
3159 | }; | |
3160 | static struct kobj_type rdev_ktype = { | |
3161 | .release = rdev_free, | |
3162 | .sysfs_ops = &rdev_sysfs_ops, | |
3163 | .default_attrs = rdev_default_attrs, | |
3164 | }; | |
3165 | ||
3cb03002 | 3166 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3167 | { |
3168 | rdev->desc_nr = -1; | |
3169 | rdev->saved_raid_disk = -1; | |
3170 | rdev->raid_disk = -1; | |
3171 | rdev->flags = 0; | |
3172 | rdev->data_offset = 0; | |
c6563a8c | 3173 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3174 | rdev->sb_events = 0; |
3175 | rdev->last_read_error.tv_sec = 0; | |
3176 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3177 | rdev->sb_loaded = 0; |
3178 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3179 | atomic_set(&rdev->nr_pending, 0); |
3180 | atomic_set(&rdev->read_errors, 0); | |
3181 | atomic_set(&rdev->corrected_errors, 0); | |
3182 | ||
3183 | INIT_LIST_HEAD(&rdev->same_set); | |
3184 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3185 | |
3186 | /* Add space to store bad block list. | |
3187 | * This reserves the space even on arrays where it cannot | |
3188 | * be used - I wonder if that matters | |
3189 | */ | |
fc974ee2 | 3190 | return badblocks_init(&rdev->badblocks, 0); |
e8bb9a83 N |
3191 | } |
3192 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3193 | /* |
3194 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3195 | * | |
3196 | * mark the device faulty if: | |
3197 | * | |
3198 | * - the device is nonexistent (zero size) | |
3199 | * - the device has no valid superblock | |
3200 | * | |
3201 | * a faulty rdev _never_ has rdev->sb set. | |
3202 | */ | |
3cb03002 | 3203 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3204 | { |
3205 | char b[BDEVNAME_SIZE]; | |
3206 | int err; | |
3cb03002 | 3207 | struct md_rdev *rdev; |
1da177e4 LT |
3208 | sector_t size; |
3209 | ||
9ffae0cf | 3210 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3211 | if (!rdev) { |
3212 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3213 | return ERR_PTR(-ENOMEM); | |
3214 | } | |
1da177e4 | 3215 | |
2230dfe4 N |
3216 | err = md_rdev_init(rdev); |
3217 | if (err) | |
3218 | goto abort_free; | |
3219 | err = alloc_disk_sb(rdev); | |
3220 | if (err) | |
1da177e4 LT |
3221 | goto abort_free; |
3222 | ||
c5d79adb | 3223 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3224 | if (err) |
3225 | goto abort_free; | |
3226 | ||
f9cb074b | 3227 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3228 | |
77304d2a | 3229 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 | 3230 | if (!size) { |
f72ffdd6 | 3231 | printk(KERN_WARNING |
1da177e4 LT |
3232 | "md: %s has zero or unknown size, marking faulty!\n", |
3233 | bdevname(rdev->bdev,b)); | |
3234 | err = -EINVAL; | |
3235 | goto abort_free; | |
3236 | } | |
3237 | ||
3238 | if (super_format >= 0) { | |
3239 | err = super_types[super_format]. | |
3240 | load_super(rdev, NULL, super_minor); | |
3241 | if (err == -EINVAL) { | |
df968c4e N |
3242 | printk(KERN_WARNING |
3243 | "md: %s does not have a valid v%d.%d " | |
3244 | "superblock, not importing!\n", | |
3245 | bdevname(rdev->bdev,b), | |
3246 | super_format, super_minor); | |
1da177e4 LT |
3247 | goto abort_free; |
3248 | } | |
3249 | if (err < 0) { | |
f72ffdd6 | 3250 | printk(KERN_WARNING |
1da177e4 LT |
3251 | "md: could not read %s's sb, not importing!\n", |
3252 | bdevname(rdev->bdev,b)); | |
3253 | goto abort_free; | |
3254 | } | |
3255 | } | |
6bfe0b49 | 3256 | |
1da177e4 LT |
3257 | return rdev; |
3258 | ||
3259 | abort_free: | |
2699b672 N |
3260 | if (rdev->bdev) |
3261 | unlock_rdev(rdev); | |
545c8795 | 3262 | md_rdev_clear(rdev); |
1da177e4 LT |
3263 | kfree(rdev); |
3264 | return ERR_PTR(err); | |
3265 | } | |
3266 | ||
3267 | /* | |
3268 | * Check a full RAID array for plausibility | |
3269 | */ | |
3270 | ||
f72ffdd6 | 3271 | static void analyze_sbs(struct mddev *mddev) |
1da177e4 LT |
3272 | { |
3273 | int i; | |
3cb03002 | 3274 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3275 | char b[BDEVNAME_SIZE]; |
3276 | ||
3277 | freshest = NULL; | |
dafb20fa | 3278 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3279 | switch (super_types[mddev->major_version]. |
3280 | load_super(rdev, freshest, mddev->minor_version)) { | |
3281 | case 1: | |
3282 | freshest = rdev; | |
3283 | break; | |
3284 | case 0: | |
3285 | break; | |
3286 | default: | |
3287 | printk( KERN_ERR \ | |
3288 | "md: fatal superblock inconsistency in %s" | |
f72ffdd6 | 3289 | " -- removing from array\n", |
1da177e4 | 3290 | bdevname(rdev->bdev,b)); |
fb56dfef | 3291 | md_kick_rdev_from_array(rdev); |
1da177e4 LT |
3292 | } |
3293 | ||
1da177e4 LT |
3294 | super_types[mddev->major_version]. |
3295 | validate_super(mddev, freshest); | |
3296 | ||
3297 | i = 0; | |
dafb20fa | 3298 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3299 | if (mddev->max_disks && |
3300 | (rdev->desc_nr >= mddev->max_disks || | |
3301 | i > mddev->max_disks)) { | |
de01dfad N |
3302 | printk(KERN_WARNING |
3303 | "md: %s: %s: only %d devices permitted\n", | |
3304 | mdname(mddev), bdevname(rdev->bdev, b), | |
3305 | mddev->max_disks); | |
fb56dfef | 3306 | md_kick_rdev_from_array(rdev); |
de01dfad N |
3307 | continue; |
3308 | } | |
1aee41f6 | 3309 | if (rdev != freshest) { |
1da177e4 LT |
3310 | if (super_types[mddev->major_version]. |
3311 | validate_super(mddev, rdev)) { | |
3312 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3313 | " from array!\n", | |
3314 | bdevname(rdev->bdev,b)); | |
fb56dfef | 3315 | md_kick_rdev_from_array(rdev); |
1da177e4 LT |
3316 | continue; |
3317 | } | |
1aee41f6 | 3318 | } |
1da177e4 LT |
3319 | if (mddev->level == LEVEL_MULTIPATH) { |
3320 | rdev->desc_nr = i++; | |
3321 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3322 | set_bit(In_sync, &rdev->flags); |
f2076e7d SL |
3323 | } else if (rdev->raid_disk >= |
3324 | (mddev->raid_disks - min(0, mddev->delta_disks)) && | |
3325 | !test_bit(Journal, &rdev->flags)) { | |
a778b73f N |
3326 | rdev->raid_disk = -1; |
3327 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3328 | } |
3329 | } | |
1da177e4 LT |
3330 | } |
3331 | ||
72e02075 N |
3332 | /* Read a fixed-point number. |
3333 | * Numbers in sysfs attributes should be in "standard" units where | |
3334 | * possible, so time should be in seconds. | |
f72ffdd6 | 3335 | * However we internally use a a much smaller unit such as |
72e02075 N |
3336 | * milliseconds or jiffies. |
3337 | * This function takes a decimal number with a possible fractional | |
3338 | * component, and produces an integer which is the result of | |
3339 | * multiplying that number by 10^'scale'. | |
3340 | * all without any floating-point arithmetic. | |
3341 | */ | |
3342 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3343 | { | |
3344 | unsigned long result = 0; | |
3345 | long decimals = -1; | |
3346 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3347 | if (*cp == '.') | |
3348 | decimals = 0; | |
3349 | else if (decimals < scale) { | |
3350 | unsigned int value; | |
3351 | value = *cp - '0'; | |
3352 | result = result * 10 + value; | |
3353 | if (decimals >= 0) | |
3354 | decimals++; | |
3355 | } | |
3356 | cp++; | |
3357 | } | |
3358 | if (*cp == '\n') | |
3359 | cp++; | |
3360 | if (*cp) | |
3361 | return -EINVAL; | |
3362 | if (decimals < 0) | |
3363 | decimals = 0; | |
3364 | while (decimals < scale) { | |
3365 | result *= 10; | |
3366 | decimals ++; | |
3367 | } | |
3368 | *res = result; | |
3369 | return 0; | |
3370 | } | |
3371 | ||
16f17b39 | 3372 | static ssize_t |
fd01b88c | 3373 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3374 | { |
3375 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3376 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3377 | } | |
3378 | static ssize_t | |
fd01b88c | 3379 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3380 | { |
16f17b39 | 3381 | unsigned long msec; |
97ce0a7f | 3382 | |
28c1b9fd GR |
3383 | if (mddev_is_clustered(mddev)) { |
3384 | pr_info("md: Safemode is disabled for clustered mode\n"); | |
3385 | return -EINVAL; | |
3386 | } | |
3387 | ||
72e02075 | 3388 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3389 | return -EINVAL; |
16f17b39 N |
3390 | if (msec == 0) |
3391 | mddev->safemode_delay = 0; | |
3392 | else { | |
19052c0e | 3393 | unsigned long old_delay = mddev->safemode_delay; |
1b30e66f N |
3394 | unsigned long new_delay = (msec*HZ)/1000; |
3395 | ||
3396 | if (new_delay == 0) | |
3397 | new_delay = 1; | |
3398 | mddev->safemode_delay = new_delay; | |
3399 | if (new_delay < old_delay || old_delay == 0) | |
3400 | mod_timer(&mddev->safemode_timer, jiffies+1); | |
16f17b39 N |
3401 | } |
3402 | return len; | |
3403 | } | |
3404 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3405 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3406 | |
eae1701f | 3407 | static ssize_t |
fd01b88c | 3408 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3409 | { |
36d091f4 N |
3410 | struct md_personality *p; |
3411 | int ret; | |
3412 | spin_lock(&mddev->lock); | |
3413 | p = mddev->pers; | |
d9d166c2 | 3414 | if (p) |
36d091f4 | 3415 | ret = sprintf(page, "%s\n", p->name); |
d9d166c2 | 3416 | else if (mddev->clevel[0]) |
36d091f4 | 3417 | ret = sprintf(page, "%s\n", mddev->clevel); |
d9d166c2 | 3418 | else if (mddev->level != LEVEL_NONE) |
36d091f4 | 3419 | ret = sprintf(page, "%d\n", mddev->level); |
d9d166c2 | 3420 | else |
36d091f4 N |
3421 | ret = 0; |
3422 | spin_unlock(&mddev->lock); | |
3423 | return ret; | |
eae1701f N |
3424 | } |
3425 | ||
d9d166c2 | 3426 | static ssize_t |
fd01b88c | 3427 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3428 | { |
f2859af6 | 3429 | char clevel[16]; |
6791875e N |
3430 | ssize_t rv; |
3431 | size_t slen = len; | |
db721d32 | 3432 | struct md_personality *pers, *oldpers; |
f2859af6 | 3433 | long level; |
db721d32 | 3434 | void *priv, *oldpriv; |
3cb03002 | 3435 | struct md_rdev *rdev; |
245f46c2 | 3436 | |
6791875e N |
3437 | if (slen == 0 || slen >= sizeof(clevel)) |
3438 | return -EINVAL; | |
3439 | ||
3440 | rv = mddev_lock(mddev); | |
3441 | if (rv) | |
3442 | return rv; | |
3443 | ||
245f46c2 | 3444 | if (mddev->pers == NULL) { |
6791875e N |
3445 | strncpy(mddev->clevel, buf, slen); |
3446 | if (mddev->clevel[slen-1] == '\n') | |
3447 | slen--; | |
3448 | mddev->clevel[slen] = 0; | |
245f46c2 | 3449 | mddev->level = LEVEL_NONE; |
6791875e N |
3450 | rv = len; |
3451 | goto out_unlock; | |
245f46c2 | 3452 | } |
6791875e | 3453 | rv = -EROFS; |
bd8839e0 | 3454 | if (mddev->ro) |
6791875e | 3455 | goto out_unlock; |
245f46c2 N |
3456 | |
3457 | /* request to change the personality. Need to ensure: | |
3458 | * - array is not engaged in resync/recovery/reshape | |
3459 | * - old personality can be suspended | |
3460 | * - new personality will access other array. | |
3461 | */ | |
3462 | ||
6791875e | 3463 | rv = -EBUSY; |
bb4f1e9d | 3464 | if (mddev->sync_thread || |
f851b60d | 3465 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
bb4f1e9d N |
3466 | mddev->reshape_position != MaxSector || |
3467 | mddev->sysfs_active) | |
6791875e | 3468 | goto out_unlock; |
245f46c2 | 3469 | |
6791875e | 3470 | rv = -EINVAL; |
245f46c2 N |
3471 | if (!mddev->pers->quiesce) { |
3472 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3473 | mdname(mddev), mddev->pers->name); | |
6791875e | 3474 | goto out_unlock; |
245f46c2 N |
3475 | } |
3476 | ||
3477 | /* Now find the new personality */ | |
6791875e N |
3478 | strncpy(clevel, buf, slen); |
3479 | if (clevel[slen-1] == '\n') | |
3480 | slen--; | |
3481 | clevel[slen] = 0; | |
b29bebd6 | 3482 | if (kstrtol(clevel, 10, &level)) |
f2859af6 | 3483 | level = LEVEL_NONE; |
245f46c2 | 3484 | |
f2859af6 DW |
3485 | if (request_module("md-%s", clevel) != 0) |
3486 | request_module("md-level-%s", clevel); | |
245f46c2 | 3487 | spin_lock(&pers_lock); |
f2859af6 | 3488 | pers = find_pers(level, clevel); |
245f46c2 N |
3489 | if (!pers || !try_module_get(pers->owner)) { |
3490 | spin_unlock(&pers_lock); | |
f2859af6 | 3491 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
6791875e N |
3492 | rv = -EINVAL; |
3493 | goto out_unlock; | |
245f46c2 N |
3494 | } |
3495 | spin_unlock(&pers_lock); | |
3496 | ||
3497 | if (pers == mddev->pers) { | |
3498 | /* Nothing to do! */ | |
3499 | module_put(pers->owner); | |
6791875e N |
3500 | rv = len; |
3501 | goto out_unlock; | |
245f46c2 N |
3502 | } |
3503 | if (!pers->takeover) { | |
3504 | module_put(pers->owner); | |
3505 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3506 | mdname(mddev), clevel); |
6791875e N |
3507 | rv = -EINVAL; |
3508 | goto out_unlock; | |
245f46c2 N |
3509 | } |
3510 | ||
dafb20fa | 3511 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3512 | rdev->new_raid_disk = rdev->raid_disk; |
3513 | ||
245f46c2 N |
3514 | /* ->takeover must set new_* and/or delta_disks |
3515 | * if it succeeds, and may set them when it fails. | |
3516 | */ | |
3517 | priv = pers->takeover(mddev); | |
3518 | if (IS_ERR(priv)) { | |
3519 | mddev->new_level = mddev->level; | |
3520 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3521 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3522 | mddev->raid_disks -= mddev->delta_disks; |
3523 | mddev->delta_disks = 0; | |
2c810cdd | 3524 | mddev->reshape_backwards = 0; |
245f46c2 N |
3525 | module_put(pers->owner); |
3526 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3527 | mdname(mddev), clevel); |
6791875e N |
3528 | rv = PTR_ERR(priv); |
3529 | goto out_unlock; | |
245f46c2 N |
3530 | } |
3531 | ||
3532 | /* Looks like we have a winner */ | |
3533 | mddev_suspend(mddev); | |
5aa61f42 | 3534 | mddev_detach(mddev); |
36d091f4 N |
3535 | |
3536 | spin_lock(&mddev->lock); | |
db721d32 N |
3537 | oldpers = mddev->pers; |
3538 | oldpriv = mddev->private; | |
3539 | mddev->pers = pers; | |
3540 | mddev->private = priv; | |
3541 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3542 | mddev->level = mddev->new_level; | |
3543 | mddev->layout = mddev->new_layout; | |
3544 | mddev->chunk_sectors = mddev->new_chunk_sectors; | |
3545 | mddev->delta_disks = 0; | |
3546 | mddev->reshape_backwards = 0; | |
3547 | mddev->degraded = 0; | |
36d091f4 | 3548 | spin_unlock(&mddev->lock); |
db721d32 N |
3549 | |
3550 | if (oldpers->sync_request == NULL && | |
3551 | mddev->external) { | |
3552 | /* We are converting from a no-redundancy array | |
3553 | * to a redundancy array and metadata is managed | |
3554 | * externally so we need to be sure that writes | |
3555 | * won't block due to a need to transition | |
3556 | * clean->dirty | |
3557 | * until external management is started. | |
3558 | */ | |
3559 | mddev->in_sync = 0; | |
3560 | mddev->safemode_delay = 0; | |
3561 | mddev->safemode = 0; | |
3562 | } | |
f72ffdd6 | 3563 | |
db721d32 N |
3564 | oldpers->free(mddev, oldpriv); |
3565 | ||
3566 | if (oldpers->sync_request == NULL && | |
a64c876f N |
3567 | pers->sync_request != NULL) { |
3568 | /* need to add the md_redundancy_group */ | |
3569 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3570 | printk(KERN_WARNING | |
3571 | "md: cannot register extra attributes for %s\n", | |
3572 | mdname(mddev)); | |
388975cc | 3573 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
f72ffdd6 | 3574 | } |
db721d32 | 3575 | if (oldpers->sync_request != NULL && |
a64c876f N |
3576 | pers->sync_request == NULL) { |
3577 | /* need to remove the md_redundancy_group */ | |
3578 | if (mddev->to_remove == NULL) | |
3579 | mddev->to_remove = &md_redundancy_group; | |
3580 | } | |
3581 | ||
dafb20fa | 3582 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3583 | if (rdev->raid_disk < 0) |
3584 | continue; | |
bf2cb0da | 3585 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3586 | rdev->new_raid_disk = -1; |
3587 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3588 | continue; | |
36fad858 | 3589 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3590 | } |
dafb20fa | 3591 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3592 | if (rdev->raid_disk < 0) |
3593 | continue; | |
3594 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3595 | continue; | |
3596 | rdev->raid_disk = rdev->new_raid_disk; | |
3597 | if (rdev->raid_disk < 0) | |
3a981b03 | 3598 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3599 | else { |
36fad858 NK |
3600 | if (sysfs_link_rdev(mddev, rdev)) |
3601 | printk(KERN_WARNING "md: cannot register rd%d" | |
3602 | " for %s after level change\n", | |
3603 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3604 | } |
e93f68a1 N |
3605 | } |
3606 | ||
db721d32 | 3607 | if (pers->sync_request == NULL) { |
9af204cf TM |
3608 | /* this is now an array without redundancy, so |
3609 | * it must always be in_sync | |
3610 | */ | |
3611 | mddev->in_sync = 1; | |
3612 | del_timer_sync(&mddev->safemode_timer); | |
3613 | } | |
02e5f5c0 | 3614 | blk_set_stacking_limits(&mddev->queue->limits); |
245f46c2 | 3615 | pers->run(mddev); |
245f46c2 | 3616 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3617 | mddev_resume(mddev); |
830778a1 N |
3618 | if (!mddev->thread) |
3619 | md_update_sb(mddev, 1); | |
5cac7861 | 3620 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3621 | md_new_event(mddev); |
6791875e N |
3622 | rv = len; |
3623 | out_unlock: | |
3624 | mddev_unlock(mddev); | |
d9d166c2 N |
3625 | return rv; |
3626 | } | |
3627 | ||
3628 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3629 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3630 | |
d4dbd025 | 3631 | static ssize_t |
fd01b88c | 3632 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3633 | { |
3634 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3635 | if (mddev->reshape_position != MaxSector && |
3636 | mddev->layout != mddev->new_layout) | |
3637 | return sprintf(page, "%d (%d)\n", | |
3638 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3639 | return sprintf(page, "%d\n", mddev->layout); |
3640 | } | |
3641 | ||
3642 | static ssize_t | |
fd01b88c | 3643 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 | 3644 | { |
4c9309c0 | 3645 | unsigned int n; |
6791875e | 3646 | int err; |
d4dbd025 | 3647 | |
4c9309c0 AD |
3648 | err = kstrtouint(buf, 10, &n); |
3649 | if (err < 0) | |
3650 | return err; | |
6791875e N |
3651 | err = mddev_lock(mddev); |
3652 | if (err) | |
3653 | return err; | |
d4dbd025 | 3654 | |
b3546035 | 3655 | if (mddev->pers) { |
50ac168a | 3656 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3657 | err = -EBUSY; |
3658 | else if (mddev->ro) | |
3659 | err = -EROFS; | |
3660 | else { | |
3661 | mddev->new_layout = n; | |
3662 | err = mddev->pers->check_reshape(mddev); | |
3663 | if (err) | |
3664 | mddev->new_layout = mddev->layout; | |
597a711b | 3665 | } |
b3546035 | 3666 | } else { |
08a02ecd | 3667 | mddev->new_layout = n; |
b3546035 N |
3668 | if (mddev->reshape_position == MaxSector) |
3669 | mddev->layout = n; | |
3670 | } | |
6791875e N |
3671 | mddev_unlock(mddev); |
3672 | return err ?: len; | |
d4dbd025 N |
3673 | } |
3674 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3675 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 | 3676 | |
eae1701f | 3677 | static ssize_t |
fd01b88c | 3678 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3679 | { |
bb636547 N |
3680 | if (mddev->raid_disks == 0) |
3681 | return 0; | |
08a02ecd N |
3682 | if (mddev->reshape_position != MaxSector && |
3683 | mddev->delta_disks != 0) | |
3684 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3685 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3686 | return sprintf(page, "%d\n", mddev->raid_disks); |
3687 | } | |
3688 | ||
fd01b88c | 3689 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3690 | |
3691 | static ssize_t | |
fd01b88c | 3692 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3693 | { |
4c9309c0 | 3694 | unsigned int n; |
6791875e | 3695 | int err; |
da943b99 | 3696 | |
4c9309c0 AD |
3697 | err = kstrtouint(buf, 10, &n); |
3698 | if (err < 0) | |
3699 | return err; | |
da943b99 | 3700 | |
6791875e N |
3701 | err = mddev_lock(mddev); |
3702 | if (err) | |
3703 | return err; | |
da943b99 | 3704 | if (mddev->pers) |
6791875e | 3705 | err = update_raid_disks(mddev, n); |
08a02ecd | 3706 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3707 | struct md_rdev *rdev; |
08a02ecd | 3708 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c | 3709 | |
6791875e | 3710 | err = -EINVAL; |
c6563a8c N |
3711 | rdev_for_each(rdev, mddev) { |
3712 | if (olddisks < n && | |
3713 | rdev->data_offset < rdev->new_data_offset) | |
6791875e | 3714 | goto out_unlock; |
c6563a8c N |
3715 | if (olddisks > n && |
3716 | rdev->data_offset > rdev->new_data_offset) | |
6791875e | 3717 | goto out_unlock; |
c6563a8c | 3718 | } |
6791875e | 3719 | err = 0; |
08a02ecd N |
3720 | mddev->delta_disks = n - olddisks; |
3721 | mddev->raid_disks = n; | |
2c810cdd | 3722 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3723 | } else |
da943b99 | 3724 | mddev->raid_disks = n; |
6791875e N |
3725 | out_unlock: |
3726 | mddev_unlock(mddev); | |
3727 | return err ? err : len; | |
da943b99 N |
3728 | } |
3729 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3730 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3731 | |
3b34380a | 3732 | static ssize_t |
fd01b88c | 3733 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3734 | { |
08a02ecd | 3735 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3736 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3737 | return sprintf(page, "%d (%d)\n", | |
3738 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3739 | mddev->chunk_sectors << 9); |
3740 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3741 | } |
3742 | ||
3743 | static ssize_t | |
fd01b88c | 3744 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3745 | { |
4c9309c0 | 3746 | unsigned long n; |
6791875e | 3747 | int err; |
3b34380a | 3748 | |
4c9309c0 AD |
3749 | err = kstrtoul(buf, 10, &n); |
3750 | if (err < 0) | |
3751 | return err; | |
3b34380a | 3752 | |
6791875e N |
3753 | err = mddev_lock(mddev); |
3754 | if (err) | |
3755 | return err; | |
b3546035 | 3756 | if (mddev->pers) { |
50ac168a | 3757 | if (mddev->pers->check_reshape == NULL) |
6791875e N |
3758 | err = -EBUSY; |
3759 | else if (mddev->ro) | |
3760 | err = -EROFS; | |
3761 | else { | |
3762 | mddev->new_chunk_sectors = n >> 9; | |
3763 | err = mddev->pers->check_reshape(mddev); | |
3764 | if (err) | |
3765 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
597a711b | 3766 | } |
b3546035 | 3767 | } else { |
664e7c41 | 3768 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3769 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3770 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3771 | } |
6791875e N |
3772 | mddev_unlock(mddev); |
3773 | return err ?: len; | |
3b34380a N |
3774 | } |
3775 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3776 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3777 | |
a94213b1 | 3778 | static ssize_t |
fd01b88c | 3779 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3780 | { |
d1a7c503 N |
3781 | if (mddev->recovery_cp == MaxSector) |
3782 | return sprintf(page, "none\n"); | |
a94213b1 N |
3783 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3784 | } | |
3785 | ||
3786 | static ssize_t | |
fd01b88c | 3787 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3788 | { |
4c9309c0 | 3789 | unsigned long long n; |
6791875e | 3790 | int err; |
4c9309c0 AD |
3791 | |
3792 | if (cmd_match(buf, "none")) | |
3793 | n = MaxSector; | |
3794 | else { | |
3795 | err = kstrtoull(buf, 10, &n); | |
3796 | if (err < 0) | |
3797 | return err; | |
3798 | if (n != (sector_t)n) | |
3799 | return -EINVAL; | |
3800 | } | |
a94213b1 | 3801 | |
6791875e N |
3802 | err = mddev_lock(mddev); |
3803 | if (err) | |
3804 | return err; | |
b098636c | 3805 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6791875e | 3806 | err = -EBUSY; |
a94213b1 | 3807 | |
6791875e N |
3808 | if (!err) { |
3809 | mddev->recovery_cp = n; | |
3810 | if (mddev->pers) | |
3811 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3812 | } | |
3813 | mddev_unlock(mddev); | |
3814 | return err ?: len; | |
a94213b1 N |
3815 | } |
3816 | static struct md_sysfs_entry md_resync_start = | |
750f199e N |
3817 | __ATTR_PREALLOC(resync_start, S_IRUGO|S_IWUSR, |
3818 | resync_start_show, resync_start_store); | |
a94213b1 | 3819 | |
9e653b63 N |
3820 | /* |
3821 | * The array state can be: | |
3822 | * | |
3823 | * clear | |
3824 | * No devices, no size, no level | |
3825 | * Equivalent to STOP_ARRAY ioctl | |
3826 | * inactive | |
3827 | * May have some settings, but array is not active | |
3828 | * all IO results in error | |
3829 | * When written, doesn't tear down array, but just stops it | |
3830 | * suspended (not supported yet) | |
3831 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3832 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3833 | * readonly |
3834 | * no resync can happen. no superblocks get written. | |
3835 | * write requests fail | |
3836 | * read-auto | |
3837 | * like readonly, but behaves like 'clean' on a write request. | |
3838 | * | |
3839 | * clean - no pending writes, but otherwise active. | |
3840 | * When written to inactive array, starts without resync | |
3841 | * If a write request arrives then | |
3842 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3843 | * if not known, block and switch to write-pending | |
3844 | * If written to an active array that has pending writes, then fails. | |
3845 | * active | |
3846 | * fully active: IO and resync can be happening. | |
3847 | * When written to inactive array, starts with resync | |
3848 | * | |
3849 | * write-pending | |
3850 | * clean, but writes are blocked waiting for 'active' to be written. | |
3851 | * | |
3852 | * active-idle | |
3853 | * like active, but no writes have been seen for a while (100msec). | |
3854 | * | |
3855 | */ | |
3856 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3857 | write_pending, active_idle, bad_word}; | |
05381954 | 3858 | static char *array_states[] = { |
9e653b63 N |
3859 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3860 | "write-pending", "active-idle", NULL }; | |
3861 | ||
3862 | static int match_word(const char *word, char **list) | |
3863 | { | |
3864 | int n; | |
3865 | for (n=0; list[n]; n++) | |
3866 | if (cmd_match(word, list[n])) | |
3867 | break; | |
3868 | return n; | |
3869 | } | |
3870 | ||
3871 | static ssize_t | |
fd01b88c | 3872 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3873 | { |
3874 | enum array_state st = inactive; | |
3875 | ||
3876 | if (mddev->pers) | |
3877 | switch(mddev->ro) { | |
3878 | case 1: | |
3879 | st = readonly; | |
3880 | break; | |
3881 | case 2: | |
3882 | st = read_auto; | |
3883 | break; | |
3884 | case 0: | |
3885 | if (mddev->in_sync) | |
3886 | st = clean; | |
070dc6dd | 3887 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3888 | st = write_pending; |
9e653b63 N |
3889 | else if (mddev->safemode) |
3890 | st = active_idle; | |
3891 | else | |
3892 | st = active; | |
3893 | } | |
3894 | else { | |
3895 | if (list_empty(&mddev->disks) && | |
3896 | mddev->raid_disks == 0 && | |
58c0fed4 | 3897 | mddev->dev_sectors == 0) |
9e653b63 N |
3898 | st = clear; |
3899 | else | |
3900 | st = inactive; | |
3901 | } | |
3902 | return sprintf(page, "%s\n", array_states[st]); | |
3903 | } | |
3904 | ||
f72ffdd6 N |
3905 | static int do_md_stop(struct mddev *mddev, int ro, struct block_device *bdev); |
3906 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev); | |
3907 | static int do_md_run(struct mddev *mddev); | |
fd01b88c | 3908 | static int restart_array(struct mddev *mddev); |
9e653b63 N |
3909 | |
3910 | static ssize_t | |
fd01b88c | 3911 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 | 3912 | { |
6791875e | 3913 | int err; |
9e653b63 | 3914 | enum array_state st = match_word(buf, array_states); |
6791875e N |
3915 | |
3916 | if (mddev->pers && (st == active || st == clean) && mddev->ro != 1) { | |
3917 | /* don't take reconfig_mutex when toggling between | |
3918 | * clean and active | |
3919 | */ | |
3920 | spin_lock(&mddev->lock); | |
3921 | if (st == active) { | |
3922 | restart_array(mddev); | |
3923 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3924 | wake_up(&mddev->sb_wait); | |
3925 | err = 0; | |
3926 | } else /* st == clean */ { | |
3927 | restart_array(mddev); | |
3928 | if (atomic_read(&mddev->writes_pending) == 0) { | |
3929 | if (mddev->in_sync == 0) { | |
3930 | mddev->in_sync = 1; | |
3931 | if (mddev->safemode == 1) | |
3932 | mddev->safemode = 0; | |
3933 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
3934 | } | |
3935 | err = 0; | |
3936 | } else | |
3937 | err = -EBUSY; | |
3938 | } | |
3939 | spin_unlock(&mddev->lock); | |
c008f1d3 | 3940 | return err ?: len; |
6791875e N |
3941 | } |
3942 | err = mddev_lock(mddev); | |
3943 | if (err) | |
3944 | return err; | |
3945 | err = -EINVAL; | |
9e653b63 N |
3946 | switch(st) { |
3947 | case bad_word: | |
3948 | break; | |
3949 | case clear: | |
3950 | /* stopping an active array */ | |
a05b7ea0 | 3951 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3952 | break; |
3953 | case inactive: | |
3954 | /* stopping an active array */ | |
90cf195d | 3955 | if (mddev->pers) |
a05b7ea0 | 3956 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3957 | else |
e691063a | 3958 | err = 0; /* already inactive */ |
9e653b63 N |
3959 | break; |
3960 | case suspended: | |
3961 | break; /* not supported yet */ | |
3962 | case readonly: | |
3963 | if (mddev->pers) | |
a05b7ea0 | 3964 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3965 | else { |
3966 | mddev->ro = 1; | |
648b629e | 3967 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3968 | err = do_md_run(mddev); |
3969 | } | |
3970 | break; | |
3971 | case read_auto: | |
9e653b63 | 3972 | if (mddev->pers) { |
80268ee9 | 3973 | if (mddev->ro == 0) |
a05b7ea0 | 3974 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3975 | else if (mddev->ro == 1) |
648b629e N |
3976 | err = restart_array(mddev); |
3977 | if (err == 0) { | |
3978 | mddev->ro = 2; | |
3979 | set_disk_ro(mddev->gendisk, 0); | |
3980 | } | |
9e653b63 N |
3981 | } else { |
3982 | mddev->ro = 2; | |
3983 | err = do_md_run(mddev); | |
3984 | } | |
3985 | break; | |
3986 | case clean: | |
3987 | if (mddev->pers) { | |
339421de SL |
3988 | err = restart_array(mddev); |
3989 | if (err) | |
3990 | break; | |
85572d7c | 3991 | spin_lock(&mddev->lock); |
9e653b63 | 3992 | if (atomic_read(&mddev->writes_pending) == 0) { |
e691063a N |
3993 | if (mddev->in_sync == 0) { |
3994 | mddev->in_sync = 1; | |
31a59e34 N |
3995 | if (mddev->safemode == 1) |
3996 | mddev->safemode = 0; | |
070dc6dd | 3997 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3998 | } |
3999 | err = 0; | |
4000 | } else | |
4001 | err = -EBUSY; | |
85572d7c | 4002 | spin_unlock(&mddev->lock); |
5bf29597 N |
4003 | } else |
4004 | err = -EINVAL; | |
9e653b63 N |
4005 | break; |
4006 | case active: | |
4007 | if (mddev->pers) { | |
339421de SL |
4008 | err = restart_array(mddev); |
4009 | if (err) | |
4010 | break; | |
070dc6dd | 4011 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
4012 | wake_up(&mddev->sb_wait); |
4013 | err = 0; | |
4014 | } else { | |
4015 | mddev->ro = 0; | |
648b629e | 4016 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
4017 | err = do_md_run(mddev); |
4018 | } | |
4019 | break; | |
4020 | case write_pending: | |
4021 | case active_idle: | |
4022 | /* these cannot be set */ | |
4023 | break; | |
4024 | } | |
6791875e N |
4025 | |
4026 | if (!err) { | |
1d23f178 N |
4027 | if (mddev->hold_active == UNTIL_IOCTL) |
4028 | mddev->hold_active = 0; | |
00bcb4ac | 4029 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4030 | } |
6791875e N |
4031 | mddev_unlock(mddev); |
4032 | return err ?: len; | |
9e653b63 | 4033 | } |
80ca3a44 | 4034 | static struct md_sysfs_entry md_array_state = |
750f199e | 4035 | __ATTR_PREALLOC(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); |
9e653b63 | 4036 | |
1e50915f | 4037 | static ssize_t |
fd01b88c | 4038 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
4039 | return sprintf(page, "%d\n", |
4040 | atomic_read(&mddev->max_corr_read_errors)); | |
4041 | } | |
4042 | ||
4043 | static ssize_t | |
fd01b88c | 4044 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f | 4045 | { |
4c9309c0 AD |
4046 | unsigned int n; |
4047 | int rv; | |
1e50915f | 4048 | |
4c9309c0 AD |
4049 | rv = kstrtouint(buf, 10, &n); |
4050 | if (rv < 0) | |
4051 | return rv; | |
4052 | atomic_set(&mddev->max_corr_read_errors, n); | |
4053 | return len; | |
1e50915f RB |
4054 | } |
4055 | ||
4056 | static struct md_sysfs_entry max_corr_read_errors = | |
4057 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
4058 | max_corrected_read_errors_store); | |
4059 | ||
6d7ff738 | 4060 | static ssize_t |
fd01b88c | 4061 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
4062 | { |
4063 | return -EINVAL; | |
4064 | } | |
4065 | ||
4066 | static ssize_t | |
fd01b88c | 4067 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
4068 | { |
4069 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
4070 | /* The new device is added to the array. | |
4071 | * If the array has a persistent superblock, we read the | |
4072 | * superblock to initialise info and check validity. | |
4073 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
4074 | * which mainly checks size. | |
4075 | */ | |
4076 | char *e; | |
4077 | int major = simple_strtoul(buf, &e, 10); | |
4078 | int minor; | |
4079 | dev_t dev; | |
3cb03002 | 4080 | struct md_rdev *rdev; |
6d7ff738 N |
4081 | int err; |
4082 | ||
4083 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
4084 | return -EINVAL; | |
4085 | minor = simple_strtoul(e+1, &e, 10); | |
4086 | if (*e && *e != '\n') | |
4087 | return -EINVAL; | |
4088 | dev = MKDEV(major, minor); | |
4089 | if (major != MAJOR(dev) || | |
4090 | minor != MINOR(dev)) | |
4091 | return -EOVERFLOW; | |
4092 | ||
6791875e N |
4093 | flush_workqueue(md_misc_wq); |
4094 | ||
4095 | err = mddev_lock(mddev); | |
4096 | if (err) | |
4097 | return err; | |
6d7ff738 N |
4098 | if (mddev->persistent) { |
4099 | rdev = md_import_device(dev, mddev->major_version, | |
4100 | mddev->minor_version); | |
4101 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
4102 | struct md_rdev *rdev0 |
4103 | = list_entry(mddev->disks.next, | |
4104 | struct md_rdev, same_set); | |
6d7ff738 N |
4105 | err = super_types[mddev->major_version] |
4106 | .load_super(rdev, rdev0, mddev->minor_version); | |
4107 | if (err < 0) | |
4108 | goto out; | |
4109 | } | |
c5d79adb N |
4110 | } else if (mddev->external) |
4111 | rdev = md_import_device(dev, -2, -1); | |
4112 | else | |
6d7ff738 N |
4113 | rdev = md_import_device(dev, -1, -1); |
4114 | ||
9a8c0fa8 N |
4115 | if (IS_ERR(rdev)) { |
4116 | mddev_unlock(mddev); | |
6d7ff738 | 4117 | return PTR_ERR(rdev); |
9a8c0fa8 | 4118 | } |
6d7ff738 N |
4119 | err = bind_rdev_to_array(rdev, mddev); |
4120 | out: | |
4121 | if (err) | |
4122 | export_rdev(rdev); | |
6791875e | 4123 | mddev_unlock(mddev); |
6d7ff738 N |
4124 | return err ? err : len; |
4125 | } | |
4126 | ||
4127 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 4128 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 4129 | |
9b1d1dac | 4130 | static ssize_t |
fd01b88c | 4131 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
4132 | { |
4133 | char *end; | |
4134 | unsigned long chunk, end_chunk; | |
6791875e | 4135 | int err; |
9b1d1dac | 4136 | |
6791875e N |
4137 | err = mddev_lock(mddev); |
4138 | if (err) | |
4139 | return err; | |
9b1d1dac PC |
4140 | if (!mddev->bitmap) |
4141 | goto out; | |
4142 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
4143 | while (*buf) { | |
4144 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
4145 | if (buf == end) break; | |
4146 | if (*end == '-') { /* range */ | |
4147 | buf = end + 1; | |
4148 | end_chunk = simple_strtoul(buf, &end, 0); | |
4149 | if (buf == end) break; | |
4150 | } | |
4151 | if (*end && !isspace(*end)) break; | |
4152 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 4153 | buf = skip_spaces(end); |
9b1d1dac PC |
4154 | } |
4155 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
4156 | out: | |
6791875e | 4157 | mddev_unlock(mddev); |
9b1d1dac PC |
4158 | return len; |
4159 | } | |
4160 | ||
4161 | static struct md_sysfs_entry md_bitmap = | |
4162 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
4163 | ||
a35b0d69 | 4164 | static ssize_t |
fd01b88c | 4165 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 4166 | { |
58c0fed4 AN |
4167 | return sprintf(page, "%llu\n", |
4168 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
4169 | } |
4170 | ||
fd01b88c | 4171 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
4172 | |
4173 | static ssize_t | |
fd01b88c | 4174 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
4175 | { |
4176 | /* If array is inactive, we can reduce the component size, but | |
4177 | * not increase it (except from 0). | |
4178 | * If array is active, we can try an on-line resize | |
4179 | */ | |
b522adcd DW |
4180 | sector_t sectors; |
4181 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 4182 | |
58c0fed4 AN |
4183 | if (err < 0) |
4184 | return err; | |
6791875e N |
4185 | err = mddev_lock(mddev); |
4186 | if (err) | |
4187 | return err; | |
a35b0d69 | 4188 | if (mddev->pers) { |
58c0fed4 | 4189 | err = update_size(mddev, sectors); |
850b2b42 | 4190 | md_update_sb(mddev, 1); |
a35b0d69 | 4191 | } else { |
58c0fed4 AN |
4192 | if (mddev->dev_sectors == 0 || |
4193 | mddev->dev_sectors > sectors) | |
4194 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
4195 | else |
4196 | err = -ENOSPC; | |
4197 | } | |
6791875e | 4198 | mddev_unlock(mddev); |
a35b0d69 N |
4199 | return err ? err : len; |
4200 | } | |
4201 | ||
4202 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 4203 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 4204 | |
83f0d77a | 4205 | /* Metadata version. |
e691063a N |
4206 | * This is one of |
4207 | * 'none' for arrays with no metadata (good luck...) | |
4208 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
4209 | * or N.M for internally known formats |
4210 | */ | |
4211 | static ssize_t | |
fd01b88c | 4212 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
4213 | { |
4214 | if (mddev->persistent) | |
4215 | return sprintf(page, "%d.%d\n", | |
4216 | mddev->major_version, mddev->minor_version); | |
e691063a N |
4217 | else if (mddev->external) |
4218 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
4219 | else |
4220 | return sprintf(page, "none\n"); | |
4221 | } | |
4222 | ||
4223 | static ssize_t | |
fd01b88c | 4224 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
4225 | { |
4226 | int major, minor; | |
4227 | char *e; | |
6791875e | 4228 | int err; |
ea43ddd8 N |
4229 | /* Changing the details of 'external' metadata is |
4230 | * always permitted. Otherwise there must be | |
4231 | * no devices attached to the array. | |
4232 | */ | |
6791875e N |
4233 | |
4234 | err = mddev_lock(mddev); | |
4235 | if (err) | |
4236 | return err; | |
4237 | err = -EBUSY; | |
ea43ddd8 N |
4238 | if (mddev->external && strncmp(buf, "external:", 9) == 0) |
4239 | ; | |
4240 | else if (!list_empty(&mddev->disks)) | |
6791875e | 4241 | goto out_unlock; |
8bb93aac | 4242 | |
6791875e | 4243 | err = 0; |
8bb93aac N |
4244 | if (cmd_match(buf, "none")) { |
4245 | mddev->persistent = 0; | |
e691063a N |
4246 | mddev->external = 0; |
4247 | mddev->major_version = 0; | |
4248 | mddev->minor_version = 90; | |
6791875e | 4249 | goto out_unlock; |
e691063a N |
4250 | } |
4251 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4252 | size_t namelen = len-9; |
e691063a N |
4253 | if (namelen >= sizeof(mddev->metadata_type)) |
4254 | namelen = sizeof(mddev->metadata_type)-1; | |
4255 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4256 | mddev->metadata_type[namelen] = 0; | |
4257 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4258 | mddev->metadata_type[--namelen] = 0; | |
4259 | mddev->persistent = 0; | |
4260 | mddev->external = 1; | |
8bb93aac N |
4261 | mddev->major_version = 0; |
4262 | mddev->minor_version = 90; | |
6791875e | 4263 | goto out_unlock; |
8bb93aac N |
4264 | } |
4265 | major = simple_strtoul(buf, &e, 10); | |
6791875e | 4266 | err = -EINVAL; |
8bb93aac | 4267 | if (e==buf || *e != '.') |
6791875e | 4268 | goto out_unlock; |
8bb93aac N |
4269 | buf = e+1; |
4270 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4271 | if (e==buf || (*e && *e != '\n') ) |
6791875e N |
4272 | goto out_unlock; |
4273 | err = -ENOENT; | |
50511da3 | 4274 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
6791875e | 4275 | goto out_unlock; |
8bb93aac N |
4276 | mddev->major_version = major; |
4277 | mddev->minor_version = minor; | |
4278 | mddev->persistent = 1; | |
e691063a | 4279 | mddev->external = 0; |
6791875e N |
4280 | err = 0; |
4281 | out_unlock: | |
4282 | mddev_unlock(mddev); | |
4283 | return err ?: len; | |
8bb93aac N |
4284 | } |
4285 | ||
4286 | static struct md_sysfs_entry md_metadata = | |
750f199e | 4287 | __ATTR_PREALLOC(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4288 | |
24dd469d | 4289 | static ssize_t |
fd01b88c | 4290 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4291 | { |
7eec314d | 4292 | char *type = "idle"; |
b7b17c9b N |
4293 | unsigned long recovery = mddev->recovery; |
4294 | if (test_bit(MD_RECOVERY_FROZEN, &recovery)) | |
b6a9ce68 | 4295 | type = "frozen"; |
b7b17c9b N |
4296 | else if (test_bit(MD_RECOVERY_RUNNING, &recovery) || |
4297 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &recovery))) { | |
4298 | if (test_bit(MD_RECOVERY_RESHAPE, &recovery)) | |
ccfcc3c1 | 4299 | type = "reshape"; |
b7b17c9b N |
4300 | else if (test_bit(MD_RECOVERY_SYNC, &recovery)) { |
4301 | if (!test_bit(MD_RECOVERY_REQUESTED, &recovery)) | |
24dd469d | 4302 | type = "resync"; |
b7b17c9b | 4303 | else if (test_bit(MD_RECOVERY_CHECK, &recovery)) |
24dd469d N |
4304 | type = "check"; |
4305 | else | |
4306 | type = "repair"; | |
b7b17c9b | 4307 | } else if (test_bit(MD_RECOVERY_RECOVER, &recovery)) |
24dd469d | 4308 | type = "recover"; |
985ca973 N |
4309 | else if (mddev->reshape_position != MaxSector) |
4310 | type = "reshape"; | |
24dd469d N |
4311 | } |
4312 | return sprintf(page, "%s\n", type); | |
4313 | } | |
4314 | ||
4315 | static ssize_t | |
fd01b88c | 4316 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4317 | { |
7eec314d N |
4318 | if (!mddev->pers || !mddev->pers->sync_request) |
4319 | return -EINVAL; | |
4320 | ||
b6a9ce68 N |
4321 | |
4322 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
56ccc112 N |
4323 | if (cmd_match(page, "frozen")) |
4324 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4325 | else | |
4326 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
8e8e2518 N |
4327 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4328 | mddev_lock(mddev) == 0) { | |
4329 | flush_workqueue(md_misc_wq); | |
4330 | if (mddev->sync_thread) { | |
4331 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6791875e | 4332 | md_reap_sync_thread(mddev); |
6791875e | 4333 | } |
8e8e2518 | 4334 | mddev_unlock(mddev); |
7eec314d | 4335 | } |
312045ee | 4336 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
24dd469d | 4337 | return -EBUSY; |
72a23c21 | 4338 | else if (cmd_match(page, "resync")) |
56ccc112 | 4339 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
72a23c21 | 4340 | else if (cmd_match(page, "recover")) { |
56ccc112 | 4341 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
72a23c21 | 4342 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
72a23c21 | 4343 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4344 | int err; |
4345 | if (mddev->pers->start_reshape == NULL) | |
4346 | return -EINVAL; | |
6791875e N |
4347 | err = mddev_lock(mddev); |
4348 | if (!err) { | |
312045ee N |
4349 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4350 | err = -EBUSY; | |
4351 | else { | |
4352 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4353 | err = mddev->pers->start_reshape(mddev); | |
4354 | } | |
6791875e N |
4355 | mddev_unlock(mddev); |
4356 | } | |
16484bf5 N |
4357 | if (err) |
4358 | return err; | |
a99ac971 | 4359 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4360 | } else { |
bce74dac | 4361 | if (cmd_match(page, "check")) |
7eec314d | 4362 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4363 | else if (!cmd_match(page, "repair")) |
7eec314d | 4364 | return -EINVAL; |
56ccc112 | 4365 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
7eec314d N |
4366 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
4367 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4368 | } |
48c26ddc N |
4369 | if (mddev->ro == 2) { |
4370 | /* A write to sync_action is enough to justify | |
4371 | * canceling read-auto mode | |
4372 | */ | |
4373 | mddev->ro = 0; | |
4374 | md_wakeup_thread(mddev->sync_thread); | |
4375 | } | |
03c902e1 | 4376 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4377 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4378 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4379 | return len; |
4380 | } | |
4381 | ||
c4a39551 | 4382 | static struct md_sysfs_entry md_scan_mode = |
750f199e | 4383 | __ATTR_PREALLOC(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
c4a39551 JB |
4384 | |
4385 | static ssize_t | |
4386 | last_sync_action_show(struct mddev *mddev, char *page) | |
4387 | { | |
4388 | return sprintf(page, "%s\n", mddev->last_sync_action); | |
4389 | } | |
4390 | ||
4391 | static struct md_sysfs_entry md_last_scan_mode = __ATTR_RO(last_sync_action); | |
4392 | ||
9d88883e | 4393 | static ssize_t |
fd01b88c | 4394 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4395 | { |
4396 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4397 | (unsigned long long) |
4398 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4399 | } |
4400 | ||
80ca3a44 | 4401 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4402 | |
88202a0c | 4403 | static ssize_t |
fd01b88c | 4404 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4405 | { |
4406 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4407 | mddev->sync_speed_min ? "local": "system"); | |
4408 | } | |
4409 | ||
4410 | static ssize_t | |
fd01b88c | 4411 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c | 4412 | { |
4c9309c0 AD |
4413 | unsigned int min; |
4414 | int rv; | |
4415 | ||
88202a0c | 4416 | if (strncmp(buf, "system", 6)==0) { |
4c9309c0 AD |
4417 | min = 0; |
4418 | } else { | |
4419 | rv = kstrtouint(buf, 10, &min); | |
4420 | if (rv < 0) | |
4421 | return rv; | |
4422 | if (min == 0) | |
4423 | return -EINVAL; | |
88202a0c | 4424 | } |
88202a0c N |
4425 | mddev->sync_speed_min = min; |
4426 | return len; | |
4427 | } | |
4428 | ||
4429 | static struct md_sysfs_entry md_sync_min = | |
4430 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4431 | ||
4432 | static ssize_t | |
fd01b88c | 4433 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4434 | { |
4435 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4436 | mddev->sync_speed_max ? "local": "system"); | |
4437 | } | |
4438 | ||
4439 | static ssize_t | |
fd01b88c | 4440 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c | 4441 | { |
4c9309c0 AD |
4442 | unsigned int max; |
4443 | int rv; | |
4444 | ||
88202a0c | 4445 | if (strncmp(buf, "system", 6)==0) { |
4c9309c0 AD |
4446 | max = 0; |
4447 | } else { | |
4448 | rv = kstrtouint(buf, 10, &max); | |
4449 | if (rv < 0) | |
4450 | return rv; | |
4451 | if (max == 0) | |
4452 | return -EINVAL; | |
88202a0c | 4453 | } |
88202a0c N |
4454 | mddev->sync_speed_max = max; |
4455 | return len; | |
4456 | } | |
4457 | ||
4458 | static struct md_sysfs_entry md_sync_max = | |
4459 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4460 | ||
d7f3d291 | 4461 | static ssize_t |
fd01b88c | 4462 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4463 | { |
4464 | return sprintf(page, "%d\n", mddev->degraded); | |
4465 | } | |
4466 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4467 | |
90b08710 | 4468 | static ssize_t |
fd01b88c | 4469 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4470 | { |
4471 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4472 | } | |
4473 | ||
4474 | static ssize_t | |
fd01b88c | 4475 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4476 | { |
4477 | long n; | |
4478 | ||
b29bebd6 | 4479 | if (kstrtol(buf, 10, &n)) |
90b08710 BS |
4480 | return -EINVAL; |
4481 | ||
4482 | if (n != 0 && n != 1) | |
4483 | return -EINVAL; | |
4484 | ||
4485 | mddev->parallel_resync = n; | |
4486 | ||
4487 | if (mddev->sync_thread) | |
4488 | wake_up(&resync_wait); | |
4489 | ||
4490 | return len; | |
4491 | } | |
4492 | ||
4493 | /* force parallel resync, even with shared block devices */ | |
4494 | static struct md_sysfs_entry md_sync_force_parallel = | |
4495 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4496 | sync_force_parallel_show, sync_force_parallel_store); | |
4497 | ||
88202a0c | 4498 | static ssize_t |
fd01b88c | 4499 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4500 | { |
4501 | unsigned long resync, dt, db; | |
d1a7c503 N |
4502 | if (mddev->curr_resync == 0) |
4503 | return sprintf(page, "none\n"); | |
9687a60c AN |
4504 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4505 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4506 | if (!dt) dt++; |
9687a60c AN |
4507 | db = resync - mddev->resync_mark_cnt; |
4508 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4509 | } |
4510 | ||
80ca3a44 | 4511 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4512 | |
4513 | static ssize_t | |
fd01b88c | 4514 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4515 | { |
13ae864b | 4516 | unsigned long long max_sectors, resync; |
88202a0c | 4517 | |
acb180b0 N |
4518 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4519 | return sprintf(page, "none\n"); | |
4520 | ||
72f36d59 N |
4521 | if (mddev->curr_resync == 1 || |
4522 | mddev->curr_resync == 2) | |
4523 | return sprintf(page, "delayed\n"); | |
4524 | ||
c804cdec N |
4525 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4526 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4527 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4528 | else |
58c0fed4 | 4529 | max_sectors = mddev->dev_sectors; |
88202a0c | 4530 | |
acb180b0 | 4531 | resync = mddev->curr_resync_completed; |
13ae864b | 4532 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4533 | } |
4534 | ||
750f199e N |
4535 | static struct md_sysfs_entry md_sync_completed = |
4536 | __ATTR_PREALLOC(sync_completed, S_IRUGO, sync_completed_show, NULL); | |
88202a0c | 4537 | |
5e96ee65 | 4538 | static ssize_t |
fd01b88c | 4539 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4540 | { |
4541 | return sprintf(page, "%llu\n", | |
4542 | (unsigned long long)mddev->resync_min); | |
4543 | } | |
4544 | static ssize_t | |
fd01b88c | 4545 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4546 | { |
4547 | unsigned long long min; | |
23da422b | 4548 | int err; |
23da422b | 4549 | |
b29bebd6 | 4550 | if (kstrtoull(buf, 10, &min)) |
5e96ee65 | 4551 | return -EINVAL; |
23da422b N |
4552 | |
4553 | spin_lock(&mddev->lock); | |
4554 | err = -EINVAL; | |
5e96ee65 | 4555 | if (min > mddev->resync_max) |
23da422b N |
4556 | goto out_unlock; |
4557 | ||
4558 | err = -EBUSY; | |
5e96ee65 | 4559 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4560 | goto out_unlock; |
5e96ee65 | 4561 | |
50c37b13 N |
4562 | /* Round down to multiple of 4K for safety */ |
4563 | mddev->resync_min = round_down(min, 8); | |
23da422b | 4564 | err = 0; |
5e96ee65 | 4565 | |
23da422b N |
4566 | out_unlock: |
4567 | spin_unlock(&mddev->lock); | |
4568 | return err ?: len; | |
5e96ee65 NB |
4569 | } |
4570 | ||
4571 | static struct md_sysfs_entry md_min_sync = | |
4572 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4573 | ||
c6207277 | 4574 | static ssize_t |
fd01b88c | 4575 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4576 | { |
4577 | if (mddev->resync_max == MaxSector) | |
4578 | return sprintf(page, "max\n"); | |
4579 | else | |
4580 | return sprintf(page, "%llu\n", | |
4581 | (unsigned long long)mddev->resync_max); | |
4582 | } | |
4583 | static ssize_t | |
fd01b88c | 4584 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 | 4585 | { |
23da422b N |
4586 | int err; |
4587 | spin_lock(&mddev->lock); | |
c6207277 N |
4588 | if (strncmp(buf, "max", 3) == 0) |
4589 | mddev->resync_max = MaxSector; | |
4590 | else { | |
5e96ee65 | 4591 | unsigned long long max; |
23da422b N |
4592 | int chunk; |
4593 | ||
4594 | err = -EINVAL; | |
b29bebd6 | 4595 | if (kstrtoull(buf, 10, &max)) |
23da422b | 4596 | goto out_unlock; |
5e96ee65 | 4597 | if (max < mddev->resync_min) |
23da422b N |
4598 | goto out_unlock; |
4599 | ||
4600 | err = -EBUSY; | |
c6207277 | 4601 | if (max < mddev->resync_max && |
4d484a4a | 4602 | mddev->ro == 0 && |
c6207277 | 4603 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
23da422b | 4604 | goto out_unlock; |
c6207277 N |
4605 | |
4606 | /* Must be a multiple of chunk_size */ | |
23da422b N |
4607 | chunk = mddev->chunk_sectors; |
4608 | if (chunk) { | |
2ac06c33 | 4609 | sector_t temp = max; |
23da422b N |
4610 | |
4611 | err = -EINVAL; | |
4612 | if (sector_div(temp, chunk)) | |
4613 | goto out_unlock; | |
c6207277 N |
4614 | } |
4615 | mddev->resync_max = max; | |
4616 | } | |
4617 | wake_up(&mddev->recovery_wait); | |
23da422b N |
4618 | err = 0; |
4619 | out_unlock: | |
4620 | spin_unlock(&mddev->lock); | |
4621 | return err ?: len; | |
c6207277 N |
4622 | } |
4623 | ||
4624 | static struct md_sysfs_entry md_max_sync = | |
4625 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4626 | ||
e464eafd | 4627 | static ssize_t |
fd01b88c | 4628 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4629 | { |
4630 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4631 | } | |
4632 | ||
4633 | static ssize_t | |
fd01b88c | 4634 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd | 4635 | { |
4c9309c0 | 4636 | unsigned long long old, new; |
6791875e | 4637 | int err; |
e464eafd | 4638 | |
4c9309c0 AD |
4639 | err = kstrtoull(buf, 10, &new); |
4640 | if (err < 0) | |
4641 | return err; | |
4642 | if (new != (sector_t)new) | |
e464eafd | 4643 | return -EINVAL; |
23ddff37 | 4644 | |
6791875e N |
4645 | err = mddev_lock(mddev); |
4646 | if (err) | |
4647 | return err; | |
4648 | err = -EINVAL; | |
4649 | if (mddev->pers == NULL || | |
4650 | mddev->pers->quiesce == NULL) | |
4651 | goto unlock; | |
4652 | old = mddev->suspend_lo; | |
23ddff37 N |
4653 | mddev->suspend_lo = new; |
4654 | if (new >= old) | |
4655 | /* Shrinking suspended region */ | |
e464eafd | 4656 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4657 | else { |
4658 | /* Expanding suspended region - need to wait */ | |
4659 | mddev->pers->quiesce(mddev, 1); | |
4660 | mddev->pers->quiesce(mddev, 0); | |
4661 | } | |
6791875e N |
4662 | err = 0; |
4663 | unlock: | |
4664 | mddev_unlock(mddev); | |
4665 | return err ?: len; | |
e464eafd N |
4666 | } |
4667 | static struct md_sysfs_entry md_suspend_lo = | |
4668 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4669 | ||
e464eafd | 4670 | static ssize_t |
fd01b88c | 4671 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4672 | { |
4673 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4674 | } | |
4675 | ||
4676 | static ssize_t | |
fd01b88c | 4677 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd | 4678 | { |
4c9309c0 | 4679 | unsigned long long old, new; |
6791875e | 4680 | int err; |
e464eafd | 4681 | |
4c9309c0 AD |
4682 | err = kstrtoull(buf, 10, &new); |
4683 | if (err < 0) | |
4684 | return err; | |
4685 | if (new != (sector_t)new) | |
e464eafd | 4686 | return -EINVAL; |
23ddff37 | 4687 | |
6791875e N |
4688 | err = mddev_lock(mddev); |
4689 | if (err) | |
4690 | return err; | |
4691 | err = -EINVAL; | |
4692 | if (mddev->pers == NULL || | |
4693 | mddev->pers->quiesce == NULL) | |
4694 | goto unlock; | |
4695 | old = mddev->suspend_hi; | |
23ddff37 N |
4696 | mddev->suspend_hi = new; |
4697 | if (new <= old) | |
4698 | /* Shrinking suspended region */ | |
4699 | mddev->pers->quiesce(mddev, 2); | |
4700 | else { | |
4701 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4702 | mddev->pers->quiesce(mddev, 1); |
4703 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 | 4704 | } |
6791875e N |
4705 | err = 0; |
4706 | unlock: | |
4707 | mddev_unlock(mddev); | |
4708 | return err ?: len; | |
e464eafd N |
4709 | } |
4710 | static struct md_sysfs_entry md_suspend_hi = | |
4711 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4712 | ||
08a02ecd | 4713 | static ssize_t |
fd01b88c | 4714 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4715 | { |
4716 | if (mddev->reshape_position != MaxSector) | |
4717 | return sprintf(page, "%llu\n", | |
4718 | (unsigned long long)mddev->reshape_position); | |
4719 | strcpy(page, "none\n"); | |
4720 | return 5; | |
4721 | } | |
4722 | ||
4723 | static ssize_t | |
fd01b88c | 4724 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4725 | { |
c6563a8c | 4726 | struct md_rdev *rdev; |
4c9309c0 | 4727 | unsigned long long new; |
6791875e | 4728 | int err; |
6791875e | 4729 | |
4c9309c0 AD |
4730 | err = kstrtoull(buf, 10, &new); |
4731 | if (err < 0) | |
4732 | return err; | |
4733 | if (new != (sector_t)new) | |
08a02ecd | 4734 | return -EINVAL; |
6791875e N |
4735 | err = mddev_lock(mddev); |
4736 | if (err) | |
4737 | return err; | |
4738 | err = -EBUSY; | |
4739 | if (mddev->pers) | |
4740 | goto unlock; | |
08a02ecd N |
4741 | mddev->reshape_position = new; |
4742 | mddev->delta_disks = 0; | |
2c810cdd | 4743 | mddev->reshape_backwards = 0; |
08a02ecd N |
4744 | mddev->new_level = mddev->level; |
4745 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4746 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4747 | rdev_for_each(rdev, mddev) |
4748 | rdev->new_data_offset = rdev->data_offset; | |
6791875e N |
4749 | err = 0; |
4750 | unlock: | |
4751 | mddev_unlock(mddev); | |
4752 | return err ?: len; | |
08a02ecd N |
4753 | } |
4754 | ||
4755 | static struct md_sysfs_entry md_reshape_position = | |
4756 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4757 | reshape_position_store); | |
4758 | ||
2c810cdd N |
4759 | static ssize_t |
4760 | reshape_direction_show(struct mddev *mddev, char *page) | |
4761 | { | |
4762 | return sprintf(page, "%s\n", | |
4763 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4764 | } | |
4765 | ||
4766 | static ssize_t | |
4767 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4768 | { | |
4769 | int backwards = 0; | |
6791875e N |
4770 | int err; |
4771 | ||
2c810cdd N |
4772 | if (cmd_match(buf, "forwards")) |
4773 | backwards = 0; | |
4774 | else if (cmd_match(buf, "backwards")) | |
4775 | backwards = 1; | |
4776 | else | |
4777 | return -EINVAL; | |
4778 | if (mddev->reshape_backwards == backwards) | |
4779 | return len; | |
4780 | ||
6791875e N |
4781 | err = mddev_lock(mddev); |
4782 | if (err) | |
4783 | return err; | |
2c810cdd N |
4784 | /* check if we are allowed to change */ |
4785 | if (mddev->delta_disks) | |
6791875e N |
4786 | err = -EBUSY; |
4787 | else if (mddev->persistent && | |
2c810cdd | 4788 | mddev->major_version == 0) |
6791875e N |
4789 | err = -EINVAL; |
4790 | else | |
4791 | mddev->reshape_backwards = backwards; | |
4792 | mddev_unlock(mddev); | |
4793 | return err ?: len; | |
2c810cdd N |
4794 | } |
4795 | ||
4796 | static struct md_sysfs_entry md_reshape_direction = | |
4797 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4798 | reshape_direction_store); | |
4799 | ||
b522adcd | 4800 | static ssize_t |
fd01b88c | 4801 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4802 | { |
4803 | if (mddev->external_size) | |
4804 | return sprintf(page, "%llu\n", | |
4805 | (unsigned long long)mddev->array_sectors/2); | |
4806 | else | |
4807 | return sprintf(page, "default\n"); | |
4808 | } | |
4809 | ||
4810 | static ssize_t | |
fd01b88c | 4811 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4812 | { |
4813 | sector_t sectors; | |
6791875e N |
4814 | int err; |
4815 | ||
4816 | err = mddev_lock(mddev); | |
4817 | if (err) | |
4818 | return err; | |
b522adcd | 4819 | |
ab5a98b1 GJ |
4820 | /* cluster raid doesn't support change array_sectors */ |
4821 | if (mddev_is_clustered(mddev)) | |
4822 | return -EINVAL; | |
4823 | ||
b522adcd DW |
4824 | if (strncmp(buf, "default", 7) == 0) { |
4825 | if (mddev->pers) | |
4826 | sectors = mddev->pers->size(mddev, 0, 0); | |
4827 | else | |
4828 | sectors = mddev->array_sectors; | |
4829 | ||
4830 | mddev->external_size = 0; | |
4831 | } else { | |
4832 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
6791875e N |
4833 | err = -EINVAL; |
4834 | else if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
4835 | err = -E2BIG; | |
4836 | else | |
4837 | mddev->external_size = 1; | |
b522adcd DW |
4838 | } |
4839 | ||
6791875e N |
4840 | if (!err) { |
4841 | mddev->array_sectors = sectors; | |
4842 | if (mddev->pers) { | |
4843 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
4844 | revalidate_disk(mddev->gendisk); | |
4845 | } | |
cbe6ef1d | 4846 | } |
6791875e N |
4847 | mddev_unlock(mddev); |
4848 | return err ?: len; | |
b522adcd DW |
4849 | } |
4850 | ||
4851 | static struct md_sysfs_entry md_array_size = | |
4852 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4853 | array_size_store); | |
e464eafd | 4854 | |
eae1701f N |
4855 | static struct attribute *md_default_attrs[] = { |
4856 | &md_level.attr, | |
d4dbd025 | 4857 | &md_layout.attr, |
eae1701f | 4858 | &md_raid_disks.attr, |
3b34380a | 4859 | &md_chunk_size.attr, |
a35b0d69 | 4860 | &md_size.attr, |
a94213b1 | 4861 | &md_resync_start.attr, |
8bb93aac | 4862 | &md_metadata.attr, |
6d7ff738 | 4863 | &md_new_device.attr, |
16f17b39 | 4864 | &md_safe_delay.attr, |
9e653b63 | 4865 | &md_array_state.attr, |
08a02ecd | 4866 | &md_reshape_position.attr, |
2c810cdd | 4867 | &md_reshape_direction.attr, |
b522adcd | 4868 | &md_array_size.attr, |
1e50915f | 4869 | &max_corr_read_errors.attr, |
411036fa N |
4870 | NULL, |
4871 | }; | |
4872 | ||
4873 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4874 | &md_scan_mode.attr, |
c4a39551 | 4875 | &md_last_scan_mode.attr, |
9d88883e | 4876 | &md_mismatches.attr, |
88202a0c N |
4877 | &md_sync_min.attr, |
4878 | &md_sync_max.attr, | |
4879 | &md_sync_speed.attr, | |
90b08710 | 4880 | &md_sync_force_parallel.attr, |
88202a0c | 4881 | &md_sync_completed.attr, |
5e96ee65 | 4882 | &md_min_sync.attr, |
c6207277 | 4883 | &md_max_sync.attr, |
e464eafd N |
4884 | &md_suspend_lo.attr, |
4885 | &md_suspend_hi.attr, | |
9b1d1dac | 4886 | &md_bitmap.attr, |
d7f3d291 | 4887 | &md_degraded.attr, |
eae1701f N |
4888 | NULL, |
4889 | }; | |
411036fa N |
4890 | static struct attribute_group md_redundancy_group = { |
4891 | .name = NULL, | |
4892 | .attrs = md_redundancy_attrs, | |
4893 | }; | |
4894 | ||
eae1701f N |
4895 | static ssize_t |
4896 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4897 | { | |
4898 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4899 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4900 | ssize_t rv; |
eae1701f N |
4901 | |
4902 | if (!entry->show) | |
4903 | return -EIO; | |
af8a2434 N |
4904 | spin_lock(&all_mddevs_lock); |
4905 | if (list_empty(&mddev->all_mddevs)) { | |
4906 | spin_unlock(&all_mddevs_lock); | |
4907 | return -EBUSY; | |
4908 | } | |
4909 | mddev_get(mddev); | |
4910 | spin_unlock(&all_mddevs_lock); | |
4911 | ||
b7b17c9b | 4912 | rv = entry->show(mddev, page); |
af8a2434 | 4913 | mddev_put(mddev); |
96de1e66 | 4914 | return rv; |
eae1701f N |
4915 | } |
4916 | ||
4917 | static ssize_t | |
4918 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4919 | const char *page, size_t length) | |
4920 | { | |
4921 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4922 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4923 | ssize_t rv; |
eae1701f N |
4924 | |
4925 | if (!entry->store) | |
4926 | return -EIO; | |
67463acb N |
4927 | if (!capable(CAP_SYS_ADMIN)) |
4928 | return -EACCES; | |
af8a2434 N |
4929 | spin_lock(&all_mddevs_lock); |
4930 | if (list_empty(&mddev->all_mddevs)) { | |
4931 | spin_unlock(&all_mddevs_lock); | |
4932 | return -EBUSY; | |
4933 | } | |
4934 | mddev_get(mddev); | |
4935 | spin_unlock(&all_mddevs_lock); | |
6791875e | 4936 | rv = entry->store(mddev, page, length); |
af8a2434 | 4937 | mddev_put(mddev); |
96de1e66 | 4938 | return rv; |
eae1701f N |
4939 | } |
4940 | ||
4941 | static void md_free(struct kobject *ko) | |
4942 | { | |
fd01b88c | 4943 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4944 | |
4945 | if (mddev->sysfs_state) | |
4946 | sysfs_put(mddev->sysfs_state); | |
4947 | ||
6cd18e71 N |
4948 | if (mddev->queue) |
4949 | blk_cleanup_queue(mddev->queue); | |
a21d1504 N |
4950 | if (mddev->gendisk) { |
4951 | del_gendisk(mddev->gendisk); | |
4952 | put_disk(mddev->gendisk); | |
4953 | } | |
a21d1504 | 4954 | |
eae1701f N |
4955 | kfree(mddev); |
4956 | } | |
4957 | ||
52cf25d0 | 4958 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4959 | .show = md_attr_show, |
4960 | .store = md_attr_store, | |
4961 | }; | |
4962 | static struct kobj_type md_ktype = { | |
4963 | .release = md_free, | |
4964 | .sysfs_ops = &md_sysfs_ops, | |
4965 | .default_attrs = md_default_attrs, | |
4966 | }; | |
4967 | ||
1da177e4 LT |
4968 | int mdp_major = 0; |
4969 | ||
5fd3a17e DW |
4970 | static void mddev_delayed_delete(struct work_struct *ws) |
4971 | { | |
fd01b88c | 4972 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4973 | |
43a70507 | 4974 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4975 | kobject_del(&mddev->kobj); |
4976 | kobject_put(&mddev->kobj); | |
4977 | } | |
4978 | ||
efeb53c0 | 4979 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4980 | { |
48c9c27b | 4981 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4982 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4983 | struct gendisk *disk; |
efeb53c0 N |
4984 | int partitioned; |
4985 | int shift; | |
4986 | int unit; | |
3830c62f | 4987 | int error; |
1da177e4 LT |
4988 | |
4989 | if (!mddev) | |
efeb53c0 N |
4990 | return -ENODEV; |
4991 | ||
4992 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4993 | shift = partitioned ? MdpMinorShift : 0; | |
4994 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4995 | |
e804ac78 TH |
4996 | /* wait for any previous instance of this device to be |
4997 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4998 | */ |
e804ac78 | 4999 | flush_workqueue(md_misc_wq); |
d3374825 | 5000 | |
48c9c27b | 5001 | mutex_lock(&disks_mutex); |
0909dc44 N |
5002 | error = -EEXIST; |
5003 | if (mddev->gendisk) | |
5004 | goto abort; | |
efeb53c0 N |
5005 | |
5006 | if (name) { | |
5007 | /* Need to ensure that 'name' is not a duplicate. | |
5008 | */ | |
fd01b88c | 5009 | struct mddev *mddev2; |
efeb53c0 N |
5010 | spin_lock(&all_mddevs_lock); |
5011 | ||
5012 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
5013 | if (mddev2->gendisk && | |
5014 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
5015 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 5016 | goto abort; |
efeb53c0 N |
5017 | } |
5018 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 5019 | } |
8b765398 | 5020 | |
0909dc44 | 5021 | error = -ENOMEM; |
8b765398 | 5022 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
5023 | if (!mddev->queue) |
5024 | goto abort; | |
409c57f3 N |
5025 | mddev->queue->queuedata = mddev; |
5026 | ||
409c57f3 | 5027 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 5028 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 5029 | |
1da177e4 LT |
5030 | disk = alloc_disk(1 << shift); |
5031 | if (!disk) { | |
8b765398 N |
5032 | blk_cleanup_queue(mddev->queue); |
5033 | mddev->queue = NULL; | |
0909dc44 | 5034 | goto abort; |
1da177e4 | 5035 | } |
efeb53c0 | 5036 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 5037 | disk->first_minor = unit << shift; |
efeb53c0 N |
5038 | if (name) |
5039 | strcpy(disk->disk_name, name); | |
5040 | else if (partitioned) | |
1da177e4 | 5041 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 5042 | else |
1da177e4 | 5043 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
5044 | disk->fops = &md_fops; |
5045 | disk->private_data = mddev; | |
5046 | disk->queue = mddev->queue; | |
b0140891 | 5047 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 5048 | /* Allow extended partitions. This makes the |
d3374825 | 5049 | * 'mdp' device redundant, but we can't really |
92850bbd N |
5050 | * remove it now. |
5051 | */ | |
5052 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 5053 | mddev->gendisk = disk; |
b0140891 N |
5054 | /* As soon as we call add_disk(), another thread could get |
5055 | * through to md_open, so make sure it doesn't get too far | |
5056 | */ | |
5057 | mutex_lock(&mddev->open_mutex); | |
5058 | add_disk(disk); | |
5059 | ||
ed9e1982 TH |
5060 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
5061 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
5062 | if (error) { |
5063 | /* This isn't possible, but as kobject_init_and_add is marked | |
5064 | * __must_check, we must do something with the result | |
5065 | */ | |
5e55e2f5 N |
5066 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
5067 | disk->disk_name); | |
0909dc44 N |
5068 | error = 0; |
5069 | } | |
00bcb4ac N |
5070 | if (mddev->kobj.sd && |
5071 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 5072 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 5073 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
5074 | abort: |
5075 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 5076 | if (!error && mddev->kobj.sd) { |
3830c62f | 5077 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 5078 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 5079 | } |
d3374825 | 5080 | mddev_put(mddev); |
0909dc44 | 5081 | return error; |
efeb53c0 N |
5082 | } |
5083 | ||
5084 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
5085 | { | |
5086 | md_alloc(dev, NULL); | |
1da177e4 LT |
5087 | return NULL; |
5088 | } | |
5089 | ||
efeb53c0 N |
5090 | static int add_named_array(const char *val, struct kernel_param *kp) |
5091 | { | |
5092 | /* val must be "md_*" where * is not all digits. | |
5093 | * We allocate an array with a large free minor number, and | |
5094 | * set the name to val. val must not already be an active name. | |
5095 | */ | |
5096 | int len = strlen(val); | |
5097 | char buf[DISK_NAME_LEN]; | |
5098 | ||
5099 | while (len && val[len-1] == '\n') | |
5100 | len--; | |
5101 | if (len >= DISK_NAME_LEN) | |
5102 | return -E2BIG; | |
5103 | strlcpy(buf, val, len+1); | |
5104 | if (strncmp(buf, "md_", 3) != 0) | |
5105 | return -EINVAL; | |
5106 | return md_alloc(0, buf); | |
5107 | } | |
5108 | ||
1da177e4 LT |
5109 | static void md_safemode_timeout(unsigned long data) |
5110 | { | |
fd01b88c | 5111 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 5112 | |
0fd62b86 NB |
5113 | if (!atomic_read(&mddev->writes_pending)) { |
5114 | mddev->safemode = 1; | |
5115 | if (mddev->external) | |
00bcb4ac | 5116 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 5117 | } |
1da177e4 LT |
5118 | md_wakeup_thread(mddev->thread); |
5119 | } | |
5120 | ||
6ff8d8ec | 5121 | static int start_dirty_degraded; |
1da177e4 | 5122 | |
fd01b88c | 5123 | int md_run(struct mddev *mddev) |
1da177e4 | 5124 | { |
2604b703 | 5125 | int err; |
3cb03002 | 5126 | struct md_rdev *rdev; |
84fc4b56 | 5127 | struct md_personality *pers; |
1da177e4 | 5128 | |
a757e64c N |
5129 | if (list_empty(&mddev->disks)) |
5130 | /* cannot run an array with no devices.. */ | |
1da177e4 | 5131 | return -EINVAL; |
1da177e4 LT |
5132 | |
5133 | if (mddev->pers) | |
5134 | return -EBUSY; | |
bb4f1e9d N |
5135 | /* Cannot run until previous stop completes properly */ |
5136 | if (mddev->sysfs_active) | |
5137 | return -EBUSY; | |
b6eb127d | 5138 | |
1da177e4 LT |
5139 | /* |
5140 | * Analyze all RAID superblock(s) | |
5141 | */ | |
1ec4a939 N |
5142 | if (!mddev->raid_disks) { |
5143 | if (!mddev->persistent) | |
5144 | return -EINVAL; | |
a757e64c | 5145 | analyze_sbs(mddev); |
1ec4a939 | 5146 | } |
1da177e4 | 5147 | |
d9d166c2 N |
5148 | if (mddev->level != LEVEL_NONE) |
5149 | request_module("md-level-%d", mddev->level); | |
5150 | else if (mddev->clevel[0]) | |
5151 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
5152 | |
5153 | /* | |
5154 | * Drop all container device buffers, from now on | |
5155 | * the only valid external interface is through the md | |
5156 | * device. | |
1da177e4 | 5157 | */ |
dafb20fa | 5158 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 5159 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5160 | continue; |
5161 | sync_blockdev(rdev->bdev); | |
f98393a6 | 5162 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
5163 | |
5164 | /* perform some consistency tests on the device. | |
5165 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 5166 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 5167 | */ |
a6ff7e08 JB |
5168 | if (rdev->meta_bdev) { |
5169 | /* Nothing to check */; | |
5170 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
5171 | if (mddev->dev_sectors && |
5172 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 5173 | > rdev->sb_start) { |
f0d76d70 N |
5174 | printk("md: %s: data overlaps metadata\n", |
5175 | mdname(mddev)); | |
5176 | return -EINVAL; | |
5177 | } | |
5178 | } else { | |
0f420358 | 5179 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
5180 | > rdev->data_offset) { |
5181 | printk("md: %s: metadata overlaps data\n", | |
5182 | mdname(mddev)); | |
5183 | return -EINVAL; | |
5184 | } | |
5185 | } | |
00bcb4ac | 5186 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
5187 | } |
5188 | ||
a167f663 | 5189 | if (mddev->bio_set == NULL) |
395c72a7 | 5190 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 5191 | |
1da177e4 | 5192 | spin_lock(&pers_lock); |
d9d166c2 | 5193 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 5194 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 5195 | spin_unlock(&pers_lock); |
d9d166c2 N |
5196 | if (mddev->level != LEVEL_NONE) |
5197 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
5198 | mddev->level); | |
5199 | else | |
5200 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
5201 | mddev->clevel); | |
1da177e4 LT |
5202 | return -EINVAL; |
5203 | } | |
1da177e4 | 5204 | spin_unlock(&pers_lock); |
34817e8c N |
5205 | if (mddev->level != pers->level) { |
5206 | mddev->level = pers->level; | |
5207 | mddev->new_level = pers->level; | |
5208 | } | |
d9d166c2 | 5209 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 5210 | |
f6705578 | 5211 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 5212 | pers->start_reshape == NULL) { |
f6705578 | 5213 | /* This personality cannot handle reshaping... */ |
f6705578 N |
5214 | module_put(pers->owner); |
5215 | return -EINVAL; | |
5216 | } | |
5217 | ||
7dd5e7c3 N |
5218 | if (pers->sync_request) { |
5219 | /* Warn if this is a potentially silly | |
5220 | * configuration. | |
5221 | */ | |
5222 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5223 | struct md_rdev *rdev2; |
7dd5e7c3 | 5224 | int warned = 0; |
159ec1fc | 5225 | |
dafb20fa N |
5226 | rdev_for_each(rdev, mddev) |
5227 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
5228 | if (rdev < rdev2 && |
5229 | rdev->bdev->bd_contains == | |
5230 | rdev2->bdev->bd_contains) { | |
5231 | printk(KERN_WARNING | |
5232 | "%s: WARNING: %s appears to be" | |
5233 | " on the same physical disk as" | |
5234 | " %s.\n", | |
5235 | mdname(mddev), | |
5236 | bdevname(rdev->bdev,b), | |
5237 | bdevname(rdev2->bdev,b2)); | |
5238 | warned = 1; | |
5239 | } | |
5240 | } | |
159ec1fc | 5241 | |
7dd5e7c3 N |
5242 | if (warned) |
5243 | printk(KERN_WARNING | |
5244 | "True protection against single-disk" | |
5245 | " failure might be compromised.\n"); | |
5246 | } | |
5247 | ||
657390d2 | 5248 | mddev->recovery = 0; |
58c0fed4 AN |
5249 | /* may be over-ridden by personality */ |
5250 | mddev->resync_max_sectors = mddev->dev_sectors; | |
5251 | ||
6ff8d8ec | 5252 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 5253 | |
0f9552b5 | 5254 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
5255 | mddev->ro = 2; /* read-only, but switch on first write */ |
5256 | ||
36d091f4 | 5257 | err = pers->run(mddev); |
13e53df3 AN |
5258 | if (err) |
5259 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
36d091f4 | 5260 | else if (pers->size(mddev, 0, 0) < mddev->array_sectors) { |
b522adcd DW |
5261 | WARN_ONCE(!mddev->external_size, "%s: default size too small," |
5262 | " but 'external_size' not in effect?\n", __func__); | |
5263 | printk(KERN_ERR | |
5264 | "md: invalid array_size %llu > default size %llu\n", | |
5265 | (unsigned long long)mddev->array_sectors / 2, | |
36d091f4 | 5266 | (unsigned long long)pers->size(mddev, 0, 0) / 2); |
b522adcd | 5267 | err = -EINVAL; |
b522adcd | 5268 | } |
36d091f4 | 5269 | if (err == 0 && pers->sync_request && |
ef99bf48 | 5270 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { |
f9209a32 GR |
5271 | struct bitmap *bitmap; |
5272 | ||
5273 | bitmap = bitmap_create(mddev, -1); | |
5274 | if (IS_ERR(bitmap)) { | |
5275 | err = PTR_ERR(bitmap); | |
b15c2e57 N |
5276 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", |
5277 | mdname(mddev), err); | |
f9209a32 GR |
5278 | } else |
5279 | mddev->bitmap = bitmap; | |
5280 | ||
b15c2e57 | 5281 | } |
1da177e4 | 5282 | if (err) { |
5aa61f42 | 5283 | mddev_detach(mddev); |
0c35bd47 N |
5284 | if (mddev->private) |
5285 | pers->free(mddev, mddev->private); | |
bd691922 | 5286 | mddev->private = NULL; |
36d091f4 | 5287 | module_put(pers->owner); |
32a7627c N |
5288 | bitmap_destroy(mddev); |
5289 | return err; | |
1da177e4 | 5290 | } |
5c675f83 N |
5291 | if (mddev->queue) { |
5292 | mddev->queue->backing_dev_info.congested_data = mddev; | |
5293 | mddev->queue->backing_dev_info.congested_fn = md_congested; | |
5294 | } | |
36d091f4 | 5295 | if (pers->sync_request) { |
00bcb4ac N |
5296 | if (mddev->kobj.sd && |
5297 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
5298 | printk(KERN_WARNING |
5299 | "md: cannot register extra attributes for %s\n", | |
5300 | mdname(mddev)); | |
00bcb4ac | 5301 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 5302 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
5303 | mddev->ro = 0; |
5304 | ||
f72ffdd6 | 5305 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
5306 | atomic_set(&mddev->max_corr_read_errors, |
5307 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 | 5308 | mddev->safemode = 0; |
28c1b9fd GR |
5309 | if (mddev_is_clustered(mddev)) |
5310 | mddev->safemode_delay = 0; | |
5311 | else | |
5312 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ | |
1da177e4 | 5313 | mddev->in_sync = 1; |
0ca69886 | 5314 | smp_wmb(); |
36d091f4 N |
5315 | spin_lock(&mddev->lock); |
5316 | mddev->pers = pers; | |
36d091f4 | 5317 | spin_unlock(&mddev->lock); |
dafb20fa | 5318 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5319 | if (rdev->raid_disk >= 0) |
5320 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 5321 | /* failure here is OK */; |
f72ffdd6 | 5322 | |
a4a3d26d N |
5323 | if (mddev->degraded && !mddev->ro) |
5324 | /* This ensures that recovering status is reported immediately | |
5325 | * via sysfs - until a lack of spares is confirmed. | |
5326 | */ | |
5327 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
1da177e4 | 5328 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f72ffdd6 | 5329 | |
7a0a5355 | 5330 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 5331 | md_update_sb(mddev, 0); |
1da177e4 | 5332 | |
d7603b7e | 5333 | md_new_event(mddev); |
00bcb4ac N |
5334 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
5335 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 5336 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
5337 | return 0; |
5338 | } | |
390ee602 | 5339 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 5340 | |
fd01b88c | 5341 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
5342 | { |
5343 | int err; | |
5344 | ||
5345 | err = md_run(mddev); | |
5346 | if (err) | |
5347 | goto out; | |
69e51b44 N |
5348 | err = bitmap_load(mddev); |
5349 | if (err) { | |
5350 | bitmap_destroy(mddev); | |
5351 | goto out; | |
5352 | } | |
0fd018af | 5353 | |
28c1b9fd GR |
5354 | if (mddev_is_clustered(mddev)) |
5355 | md_allow_write(mddev); | |
5356 | ||
0fd018af JB |
5357 | md_wakeup_thread(mddev->thread); |
5358 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5359 | ||
fe60b014 N |
5360 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5361 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5362 | mddev->changed = 1; |
fe60b014 N |
5363 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5364 | out: | |
5365 | return err; | |
5366 | } | |
5367 | ||
fd01b88c | 5368 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5369 | { |
5370 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5371 | |
80fab1d7 | 5372 | /* Complain if it has no devices */ |
1da177e4 | 5373 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5374 | return -ENXIO; |
5375 | if (!mddev->pers) | |
5376 | return -EINVAL; | |
5377 | if (!mddev->ro) | |
5378 | return -EBUSY; | |
339421de SL |
5379 | if (test_bit(MD_HAS_JOURNAL, &mddev->flags)) { |
5380 | struct md_rdev *rdev; | |
5381 | bool has_journal = false; | |
5382 | ||
5383 | rcu_read_lock(); | |
5384 | rdev_for_each_rcu(rdev, mddev) { | |
5385 | if (test_bit(Journal, &rdev->flags) && | |
5386 | !test_bit(Faulty, &rdev->flags)) { | |
5387 | has_journal = true; | |
5388 | break; | |
5389 | } | |
5390 | } | |
5391 | rcu_read_unlock(); | |
5392 | ||
5393 | /* Don't restart rw with journal missing/faulty */ | |
5394 | if (!has_journal) | |
5395 | return -EINVAL; | |
5396 | } | |
5397 | ||
80fab1d7 AN |
5398 | mddev->safemode = 0; |
5399 | mddev->ro = 0; | |
5400 | set_disk_ro(disk, 0); | |
5401 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5402 | mdname(mddev)); | |
5403 | /* Kick recovery or resync if necessary */ | |
5404 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5405 | md_wakeup_thread(mddev->thread); | |
5406 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5407 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5408 | return 0; |
1da177e4 LT |
5409 | } |
5410 | ||
fd01b88c | 5411 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5412 | { |
5413 | mddev->array_sectors = 0; | |
5414 | mddev->external_size = 0; | |
5415 | mddev->dev_sectors = 0; | |
5416 | mddev->raid_disks = 0; | |
5417 | mddev->recovery_cp = 0; | |
5418 | mddev->resync_min = 0; | |
5419 | mddev->resync_max = MaxSector; | |
5420 | mddev->reshape_position = MaxSector; | |
5421 | mddev->external = 0; | |
5422 | mddev->persistent = 0; | |
5423 | mddev->level = LEVEL_NONE; | |
5424 | mddev->clevel[0] = 0; | |
5425 | mddev->flags = 0; | |
5426 | mddev->ro = 0; | |
5427 | mddev->metadata_type[0] = 0; | |
5428 | mddev->chunk_sectors = 0; | |
5429 | mddev->ctime = mddev->utime = 0; | |
5430 | mddev->layout = 0; | |
5431 | mddev->max_disks = 0; | |
5432 | mddev->events = 0; | |
a8707c08 | 5433 | mddev->can_decrease_events = 0; |
6177b472 | 5434 | mddev->delta_disks = 0; |
2c810cdd | 5435 | mddev->reshape_backwards = 0; |
6177b472 N |
5436 | mddev->new_level = LEVEL_NONE; |
5437 | mddev->new_layout = 0; | |
5438 | mddev->new_chunk_sectors = 0; | |
5439 | mddev->curr_resync = 0; | |
7f7583d4 | 5440 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5441 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5442 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5443 | mddev->recovery = 0; | |
5444 | mddev->in_sync = 0; | |
f0b4f7e2 | 5445 | mddev->changed = 0; |
6177b472 | 5446 | mddev->degraded = 0; |
6177b472 | 5447 | mddev->safemode = 0; |
bd691922 | 5448 | mddev->private = NULL; |
6177b472 N |
5449 | mddev->bitmap_info.offset = 0; |
5450 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5451 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5452 | mddev->bitmap_info.chunksize = 0; |
5453 | mddev->bitmap_info.daemon_sleep = 0; | |
5454 | mddev->bitmap_info.max_write_behind = 0; | |
5455 | } | |
5456 | ||
fd01b88c | 5457 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5458 | { |
6b6204ee | 5459 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
f851b60d | 5460 | flush_workqueue(md_misc_wq); |
a047e125 | 5461 | if (mddev->sync_thread) { |
a047e125 | 5462 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5463 | md_reap_sync_thread(mddev); |
a047e125 N |
5464 | } |
5465 | ||
5466 | del_timer_sync(&mddev->safemode_timer); | |
5467 | ||
5468 | bitmap_flush(mddev); | |
5469 | md_super_wait(mddev); | |
5470 | ||
b6d428c6 | 5471 | if (mddev->ro == 0 && |
28c1b9fd GR |
5472 | ((!mddev->in_sync && !mddev_is_clustered(mddev)) || |
5473 | (mddev->flags & MD_UPDATE_SB_FLAGS))) { | |
a047e125 | 5474 | /* mark array as shutdown cleanly */ |
28c1b9fd GR |
5475 | if (!mddev_is_clustered(mddev)) |
5476 | mddev->in_sync = 1; | |
a047e125 N |
5477 | md_update_sb(mddev, 1); |
5478 | } | |
5479 | } | |
defad61a | 5480 | |
fd01b88c | 5481 | void md_stop_writes(struct mddev *mddev) |
defad61a | 5482 | { |
29f097c4 | 5483 | mddev_lock_nointr(mddev); |
defad61a N |
5484 | __md_stop_writes(mddev); |
5485 | mddev_unlock(mddev); | |
5486 | } | |
390ee602 | 5487 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5488 | |
5aa61f42 N |
5489 | static void mddev_detach(struct mddev *mddev) |
5490 | { | |
5491 | struct bitmap *bitmap = mddev->bitmap; | |
5492 | /* wait for behind writes to complete */ | |
5493 | if (bitmap && atomic_read(&bitmap->behind_writes) > 0) { | |
5494 | printk(KERN_INFO "md:%s: behind writes in progress - waiting to stop.\n", | |
5495 | mdname(mddev)); | |
5496 | /* need to kick something here to make sure I/O goes? */ | |
5497 | wait_event(bitmap->behind_wait, | |
5498 | atomic_read(&bitmap->behind_writes) == 0); | |
5499 | } | |
36d091f4 | 5500 | if (mddev->pers && mddev->pers->quiesce) { |
5aa61f42 N |
5501 | mddev->pers->quiesce(mddev, 1); |
5502 | mddev->pers->quiesce(mddev, 0); | |
5503 | } | |
5504 | md_unregister_thread(&mddev->thread); | |
5505 | if (mddev->queue) | |
5506 | blk_sync_queue(mddev->queue); /* the unplug fn references 'conf'*/ | |
5507 | } | |
5508 | ||
5eff3c43 | 5509 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5510 | { |
36d091f4 | 5511 | struct md_personality *pers = mddev->pers; |
5aa61f42 | 5512 | mddev_detach(mddev); |
ee5d004f N |
5513 | /* Ensure ->event_work is done */ |
5514 | flush_workqueue(md_misc_wq); | |
36d091f4 | 5515 | spin_lock(&mddev->lock); |
6177b472 | 5516 | mddev->pers = NULL; |
36d091f4 N |
5517 | spin_unlock(&mddev->lock); |
5518 | pers->free(mddev, mddev->private); | |
bd691922 | 5519 | mddev->private = NULL; |
36d091f4 N |
5520 | if (pers->sync_request && mddev->to_remove == NULL) |
5521 | mddev->to_remove = &md_redundancy_group; | |
5522 | module_put(pers->owner); | |
cca9cf90 | 5523 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5524 | } |
5eff3c43 N |
5525 | |
5526 | void md_stop(struct mddev *mddev) | |
5527 | { | |
5528 | /* stop the array and free an attached data structures. | |
5529 | * This is called from dm-raid | |
5530 | */ | |
5531 | __md_stop(mddev); | |
5532 | bitmap_destroy(mddev); | |
5533 | if (mddev->bio_set) | |
5534 | bioset_free(mddev->bio_set); | |
5535 | } | |
5536 | ||
390ee602 | 5537 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5538 | |
a05b7ea0 | 5539 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5540 | { |
5541 | int err = 0; | |
30b8feb7 N |
5542 | int did_freeze = 0; |
5543 | ||
5544 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5545 | did_freeze = 1; | |
5546 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5547 | md_wakeup_thread(mddev->thread); | |
5548 | } | |
f851b60d | 5549 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5550 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5551 | if (mddev->sync_thread) |
30b8feb7 N |
5552 | /* Thread might be blocked waiting for metadata update |
5553 | * which will now never happen */ | |
5554 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5555 | |
88724bfa N |
5556 | if (mddev->external && test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
5557 | return -EBUSY; | |
30b8feb7 | 5558 | mddev_unlock(mddev); |
f851b60d N |
5559 | wait_event(resync_wait, !test_bit(MD_RECOVERY_RUNNING, |
5560 | &mddev->recovery)); | |
88724bfa N |
5561 | wait_event(mddev->sb_wait, |
5562 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
30b8feb7 N |
5563 | mddev_lock_nointr(mddev); |
5564 | ||
a4bd82d0 | 5565 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5566 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 | 5567 | mddev->sync_thread || |
f851b60d | 5568 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5569 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
a4bd82d0 | 5570 | printk("md: %s still in use.\n",mdname(mddev)); |
30b8feb7 N |
5571 | if (did_freeze) { |
5572 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5573 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5574 | md_wakeup_thread(mddev->thread); |
5575 | } | |
a4bd82d0 N |
5576 | err = -EBUSY; |
5577 | goto out; | |
5578 | } | |
5579 | if (mddev->pers) { | |
defad61a | 5580 | __md_stop_writes(mddev); |
a4bd82d0 N |
5581 | |
5582 | err = -ENXIO; | |
5583 | if (mddev->ro==1) | |
5584 | goto out; | |
5585 | mddev->ro = 1; | |
5586 | set_disk_ro(mddev->gendisk, 1); | |
5587 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d N |
5588 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5589 | md_wakeup_thread(mddev->thread); | |
00bcb4ac | 5590 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
30b8feb7 | 5591 | err = 0; |
a4bd82d0 N |
5592 | } |
5593 | out: | |
5594 | mutex_unlock(&mddev->open_mutex); | |
5595 | return err; | |
5596 | } | |
5597 | ||
9e653b63 N |
5598 | /* mode: |
5599 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5600 | * 2 - stop but do not disassemble array |
5601 | */ | |
f72ffdd6 | 5602 | static int do_md_stop(struct mddev *mddev, int mode, |
a05b7ea0 | 5603 | struct block_device *bdev) |
1da177e4 | 5604 | { |
1da177e4 | 5605 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5606 | struct md_rdev *rdev; |
30b8feb7 N |
5607 | int did_freeze = 0; |
5608 | ||
5609 | if (!test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) { | |
5610 | did_freeze = 1; | |
5611 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5612 | md_wakeup_thread(mddev->thread); | |
5613 | } | |
f851b60d | 5614 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
30b8feb7 | 5615 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
f851b60d | 5616 | if (mddev->sync_thread) |
30b8feb7 N |
5617 | /* Thread might be blocked waiting for metadata update |
5618 | * which will now never happen */ | |
5619 | wake_up_process(mddev->sync_thread->tsk); | |
f851b60d | 5620 | |
30b8feb7 | 5621 | mddev_unlock(mddev); |
f851b60d N |
5622 | wait_event(resync_wait, (mddev->sync_thread == NULL && |
5623 | !test_bit(MD_RECOVERY_RUNNING, | |
5624 | &mddev->recovery))); | |
30b8feb7 | 5625 | mddev_lock_nointr(mddev); |
1da177e4 | 5626 | |
c8c00a69 | 5627 | mutex_lock(&mddev->open_mutex); |
9ba3b7f5 | 5628 | if ((mddev->pers && atomic_read(&mddev->openers) > !!bdev) || |
30b8feb7 N |
5629 | mddev->sysfs_active || |
5630 | mddev->sync_thread || | |
f851b60d | 5631 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
30b8feb7 | 5632 | (bdev && !test_bit(MD_STILL_CLOSED, &mddev->flags))) { |
df5b20cf | 5633 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 | 5634 | mutex_unlock(&mddev->open_mutex); |
30b8feb7 N |
5635 | if (did_freeze) { |
5636 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
45eaf45d | 5637 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
30b8feb7 N |
5638 | md_wakeup_thread(mddev->thread); |
5639 | } | |
260fa034 N |
5640 | return -EBUSY; |
5641 | } | |
6e17b027 | 5642 | if (mddev->pers) { |
a4bd82d0 N |
5643 | if (mddev->ro) |
5644 | set_disk_ro(disk, 0); | |
409c57f3 | 5645 | |
defad61a | 5646 | __md_stop_writes(mddev); |
5eff3c43 | 5647 | __md_stop(mddev); |
a4bd82d0 | 5648 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5649 | |
a4bd82d0 | 5650 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5651 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5652 | |
dafb20fa | 5653 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5654 | if (rdev->raid_disk >= 0) |
5655 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5656 | |
a4bd82d0 | 5657 | set_capacity(disk, 0); |
6e17b027 | 5658 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5659 | mddev->changed = 1; |
a4bd82d0 | 5660 | revalidate_disk(disk); |
0d4ca600 | 5661 | |
a4bd82d0 N |
5662 | if (mddev->ro) |
5663 | mddev->ro = 0; | |
6e17b027 N |
5664 | } else |
5665 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5666 | /* |
5667 | * Free resources if final stop | |
5668 | */ | |
9e653b63 | 5669 | if (mode == 0) { |
1da177e4 LT |
5670 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5671 | ||
978f946b | 5672 | bitmap_destroy(mddev); |
c3d9714e | 5673 | if (mddev->bitmap_info.file) { |
4af1a041 N |
5674 | struct file *f = mddev->bitmap_info.file; |
5675 | spin_lock(&mddev->lock); | |
c3d9714e | 5676 | mddev->bitmap_info.file = NULL; |
4af1a041 N |
5677 | spin_unlock(&mddev->lock); |
5678 | fput(f); | |
978f946b | 5679 | } |
c3d9714e | 5680 | mddev->bitmap_info.offset = 0; |
978f946b | 5681 | |
1da177e4 LT |
5682 | export_array(mddev); |
5683 | ||
6177b472 | 5684 | md_clean(mddev); |
efeb53c0 N |
5685 | if (mddev->hold_active == UNTIL_STOP) |
5686 | mddev->hold_active = 0; | |
a4bd82d0 | 5687 | } |
d7603b7e | 5688 | md_new_event(mddev); |
00bcb4ac | 5689 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5690 | return 0; |
1da177e4 LT |
5691 | } |
5692 | ||
fdee8ae4 | 5693 | #ifndef MODULE |
fd01b88c | 5694 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5695 | { |
3cb03002 | 5696 | struct md_rdev *rdev; |
1da177e4 LT |
5697 | int err; |
5698 | ||
a757e64c | 5699 | if (list_empty(&mddev->disks)) |
1da177e4 | 5700 | return; |
1da177e4 LT |
5701 | |
5702 | printk(KERN_INFO "md: running: "); | |
5703 | ||
dafb20fa | 5704 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5705 | char b[BDEVNAME_SIZE]; |
5706 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5707 | } | |
5708 | printk("\n"); | |
5709 | ||
d710e138 | 5710 | err = do_md_run(mddev); |
1da177e4 LT |
5711 | if (err) { |
5712 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5713 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5714 | } |
5715 | } | |
5716 | ||
5717 | /* | |
5718 | * lets try to run arrays based on all disks that have arrived | |
5719 | * until now. (those are in pending_raid_disks) | |
5720 | * | |
5721 | * the method: pick the first pending disk, collect all disks with | |
5722 | * the same UUID, remove all from the pending list and put them into | |
5723 | * the 'same_array' list. Then order this list based on superblock | |
5724 | * update time (freshest comes first), kick out 'old' disks and | |
5725 | * compare superblocks. If everything's fine then run it. | |
5726 | * | |
5727 | * If "unit" is allocated, then bump its reference count | |
5728 | */ | |
5729 | static void autorun_devices(int part) | |
5730 | { | |
3cb03002 | 5731 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5732 | struct mddev *mddev; |
1da177e4 LT |
5733 | char b[BDEVNAME_SIZE]; |
5734 | ||
5735 | printk(KERN_INFO "md: autorun ...\n"); | |
5736 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5737 | int unit; |
1da177e4 | 5738 | dev_t dev; |
ad01c9e3 | 5739 | LIST_HEAD(candidates); |
1da177e4 | 5740 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5741 | struct md_rdev, same_set); |
1da177e4 LT |
5742 | |
5743 | printk(KERN_INFO "md: considering %s ...\n", | |
5744 | bdevname(rdev0->bdev,b)); | |
5745 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5746 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5747 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5748 | printk(KERN_INFO "md: adding %s ...\n", | |
5749 | bdevname(rdev->bdev,b)); | |
5750 | list_move(&rdev->same_set, &candidates); | |
5751 | } | |
5752 | /* | |
5753 | * now we have a set of devices, with all of them having | |
5754 | * mostly sane superblocks. It's time to allocate the | |
5755 | * mddev. | |
5756 | */ | |
e8703fe1 N |
5757 | if (part) { |
5758 | dev = MKDEV(mdp_major, | |
5759 | rdev0->preferred_minor << MdpMinorShift); | |
5760 | unit = MINOR(dev) >> MdpMinorShift; | |
5761 | } else { | |
5762 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5763 | unit = MINOR(dev); | |
5764 | } | |
5765 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5766 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5767 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5768 | break; | |
5769 | } | |
1da177e4 LT |
5770 | |
5771 | md_probe(dev, NULL, NULL); | |
5772 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5773 | if (!mddev || !mddev->gendisk) { |
5774 | if (mddev) | |
5775 | mddev_put(mddev); | |
5776 | printk(KERN_ERR | |
1da177e4 LT |
5777 | "md: cannot allocate memory for md drive.\n"); |
5778 | break; | |
5779 | } | |
f72ffdd6 | 5780 | if (mddev_lock(mddev)) |
1da177e4 LT |
5781 | printk(KERN_WARNING "md: %s locked, cannot run\n", |
5782 | mdname(mddev)); | |
5783 | else if (mddev->raid_disks || mddev->major_version | |
5784 | || !list_empty(&mddev->disks)) { | |
f72ffdd6 | 5785 | printk(KERN_WARNING |
1da177e4 LT |
5786 | "md: %s already running, cannot run %s\n", |
5787 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5788 | mddev_unlock(mddev); | |
5789 | } else { | |
5790 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5791 | mddev->persistent = 1; |
159ec1fc | 5792 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5793 | list_del_init(&rdev->same_set); |
5794 | if (bind_rdev_to_array(rdev, mddev)) | |
5795 | export_rdev(rdev); | |
5796 | } | |
5797 | autorun_array(mddev); | |
5798 | mddev_unlock(mddev); | |
5799 | } | |
5800 | /* on success, candidates will be empty, on error | |
5801 | * it won't... | |
5802 | */ | |
159ec1fc | 5803 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5804 | list_del_init(&rdev->same_set); |
1da177e4 | 5805 | export_rdev(rdev); |
4b80991c | 5806 | } |
1da177e4 LT |
5807 | mddev_put(mddev); |
5808 | } | |
5809 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5810 | } | |
fdee8ae4 | 5811 | #endif /* !MODULE */ |
1da177e4 | 5812 | |
f72ffdd6 | 5813 | static int get_version(void __user *arg) |
1da177e4 LT |
5814 | { |
5815 | mdu_version_t ver; | |
5816 | ||
5817 | ver.major = MD_MAJOR_VERSION; | |
5818 | ver.minor = MD_MINOR_VERSION; | |
5819 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5820 | ||
5821 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5822 | return -EFAULT; | |
5823 | ||
5824 | return 0; | |
5825 | } | |
5826 | ||
f72ffdd6 | 5827 | static int get_array_info(struct mddev *mddev, void __user *arg) |
1da177e4 LT |
5828 | { |
5829 | mdu_array_info_t info; | |
a9f326eb | 5830 | int nr,working,insync,failed,spare; |
3cb03002 | 5831 | struct md_rdev *rdev; |
1da177e4 | 5832 | |
1ca69c4b N |
5833 | nr = working = insync = failed = spare = 0; |
5834 | rcu_read_lock(); | |
5835 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5836 | nr++; |
b2d444d7 | 5837 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5838 | failed++; |
5839 | else { | |
5840 | working++; | |
b2d444d7 | 5841 | if (test_bit(In_sync, &rdev->flags)) |
f72ffdd6 | 5842 | insync++; |
1da177e4 LT |
5843 | else |
5844 | spare++; | |
5845 | } | |
5846 | } | |
1ca69c4b | 5847 | rcu_read_unlock(); |
1da177e4 LT |
5848 | |
5849 | info.major_version = mddev->major_version; | |
5850 | info.minor_version = mddev->minor_version; | |
5851 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
9ebc6ef1 | 5852 | info.ctime = clamp_t(time64_t, mddev->ctime, 0, U32_MAX); |
1da177e4 | 5853 | info.level = mddev->level; |
58c0fed4 AN |
5854 | info.size = mddev->dev_sectors / 2; |
5855 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5856 | info.size = -1; |
1da177e4 LT |
5857 | info.nr_disks = nr; |
5858 | info.raid_disks = mddev->raid_disks; | |
5859 | info.md_minor = mddev->md_minor; | |
5860 | info.not_persistent= !mddev->persistent; | |
5861 | ||
9ebc6ef1 | 5862 | info.utime = clamp_t(time64_t, mddev->utime, 0, U32_MAX); |
1da177e4 LT |
5863 | info.state = 0; |
5864 | if (mddev->in_sync) | |
5865 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5866 | if (mddev->bitmap && mddev->bitmap_info.offset) |
9bd35920 | 5867 | info.state |= (1<<MD_SB_BITMAP_PRESENT); |
ca8895d9 GR |
5868 | if (mddev_is_clustered(mddev)) |
5869 | info.state |= (1<<MD_SB_CLUSTERED); | |
a9f326eb | 5870 | info.active_disks = insync; |
1da177e4 LT |
5871 | info.working_disks = working; |
5872 | info.failed_disks = failed; | |
5873 | info.spare_disks = spare; | |
5874 | ||
5875 | info.layout = mddev->layout; | |
9d8f0363 | 5876 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5877 | |
5878 | if (copy_to_user(arg, &info, sizeof(info))) | |
5879 | return -EFAULT; | |
5880 | ||
5881 | return 0; | |
5882 | } | |
5883 | ||
f72ffdd6 | 5884 | static int get_bitmap_file(struct mddev *mddev, void __user * arg) |
32a7627c N |
5885 | { |
5886 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
f4ad3d38 | 5887 | char *ptr; |
4af1a041 | 5888 | int err; |
32a7627c | 5889 | |
b6878d9e | 5890 | file = kzalloc(sizeof(*file), GFP_NOIO); |
32a7627c | 5891 | if (!file) |
4af1a041 | 5892 | return -ENOMEM; |
32a7627c | 5893 | |
4af1a041 N |
5894 | err = 0; |
5895 | spin_lock(&mddev->lock); | |
25eafe1a BR |
5896 | /* bitmap enabled */ |
5897 | if (mddev->bitmap_info.file) { | |
5898 | ptr = file_path(mddev->bitmap_info.file, file->pathname, | |
5899 | sizeof(file->pathname)); | |
5900 | if (IS_ERR(ptr)) | |
5901 | err = PTR_ERR(ptr); | |
5902 | else | |
5903 | memmove(file->pathname, ptr, | |
5904 | sizeof(file->pathname)-(ptr-file->pathname)); | |
5905 | } | |
4af1a041 | 5906 | spin_unlock(&mddev->lock); |
32a7627c | 5907 | |
4af1a041 N |
5908 | if (err == 0 && |
5909 | copy_to_user(arg, file, sizeof(*file))) | |
32a7627c | 5910 | err = -EFAULT; |
4af1a041 | 5911 | |
32a7627c N |
5912 | kfree(file); |
5913 | return err; | |
5914 | } | |
5915 | ||
f72ffdd6 | 5916 | static int get_disk_info(struct mddev *mddev, void __user * arg) |
1da177e4 LT |
5917 | { |
5918 | mdu_disk_info_t info; | |
3cb03002 | 5919 | struct md_rdev *rdev; |
1da177e4 LT |
5920 | |
5921 | if (copy_from_user(&info, arg, sizeof(info))) | |
5922 | return -EFAULT; | |
5923 | ||
1ca69c4b | 5924 | rcu_read_lock(); |
57d051dc | 5925 | rdev = md_find_rdev_nr_rcu(mddev, info.number); |
1da177e4 LT |
5926 | if (rdev) { |
5927 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5928 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5929 | info.raid_disk = rdev->raid_disk; | |
5930 | info.state = 0; | |
b2d444d7 | 5931 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5932 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5933 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5934 | info.state |= (1<<MD_DISK_ACTIVE); |
5935 | info.state |= (1<<MD_DISK_SYNC); | |
5936 | } | |
9efdca16 | 5937 | if (test_bit(Journal, &rdev->flags)) |
bac624f3 | 5938 | info.state |= (1<<MD_DISK_JOURNAL); |
8ddf9efe N |
5939 | if (test_bit(WriteMostly, &rdev->flags)) |
5940 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5941 | } else { |
5942 | info.major = info.minor = 0; | |
5943 | info.raid_disk = -1; | |
5944 | info.state = (1<<MD_DISK_REMOVED); | |
5945 | } | |
1ca69c4b | 5946 | rcu_read_unlock(); |
1da177e4 LT |
5947 | |
5948 | if (copy_to_user(arg, &info, sizeof(info))) | |
5949 | return -EFAULT; | |
5950 | ||
5951 | return 0; | |
5952 | } | |
5953 | ||
f72ffdd6 | 5954 | static int add_new_disk(struct mddev *mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5955 | { |
5956 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5957 | struct md_rdev *rdev; |
1da177e4 LT |
5958 | dev_t dev = MKDEV(info->major,info->minor); |
5959 | ||
1aee41f6 GR |
5960 | if (mddev_is_clustered(mddev) && |
5961 | !(info->state & ((1 << MD_DISK_CLUSTER_ADD) | (1 << MD_DISK_CANDIDATE)))) { | |
fa8259da | 5962 | pr_err("%s: Cannot add to clustered mddev.\n", |
1aee41f6 GR |
5963 | mdname(mddev)); |
5964 | return -EINVAL; | |
5965 | } | |
5966 | ||
1da177e4 LT |
5967 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) |
5968 | return -EOVERFLOW; | |
5969 | ||
5970 | if (!mddev->raid_disks) { | |
5971 | int err; | |
5972 | /* expecting a device which has a superblock */ | |
5973 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5974 | if (IS_ERR(rdev)) { | |
f72ffdd6 | 5975 | printk(KERN_WARNING |
1da177e4 LT |
5976 | "md: md_import_device returned %ld\n", |
5977 | PTR_ERR(rdev)); | |
5978 | return PTR_ERR(rdev); | |
5979 | } | |
5980 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5981 | struct md_rdev *rdev0 |
5982 | = list_entry(mddev->disks.next, | |
5983 | struct md_rdev, same_set); | |
a9f326eb | 5984 | err = super_types[mddev->major_version] |
1da177e4 LT |
5985 | .load_super(rdev, rdev0, mddev->minor_version); |
5986 | if (err < 0) { | |
f72ffdd6 | 5987 | printk(KERN_WARNING |
1da177e4 | 5988 | "md: %s has different UUID to %s\n", |
f72ffdd6 | 5989 | bdevname(rdev->bdev,b), |
1da177e4 LT |
5990 | bdevname(rdev0->bdev,b2)); |
5991 | export_rdev(rdev); | |
5992 | return -EINVAL; | |
5993 | } | |
5994 | } | |
5995 | err = bind_rdev_to_array(rdev, mddev); | |
5996 | if (err) | |
5997 | export_rdev(rdev); | |
5998 | return err; | |
5999 | } | |
6000 | ||
6001 | /* | |
6002 | * add_new_disk can be used once the array is assembled | |
6003 | * to add "hot spares". They must already have a superblock | |
6004 | * written | |
6005 | */ | |
6006 | if (mddev->pers) { | |
6007 | int err; | |
6008 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 6009 | printk(KERN_WARNING |
1da177e4 LT |
6010 | "%s: personality does not support diskops!\n", |
6011 | mdname(mddev)); | |
6012 | return -EINVAL; | |
6013 | } | |
7b1e35f6 N |
6014 | if (mddev->persistent) |
6015 | rdev = md_import_device(dev, mddev->major_version, | |
6016 | mddev->minor_version); | |
6017 | else | |
6018 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 | 6019 | if (IS_ERR(rdev)) { |
f72ffdd6 | 6020 | printk(KERN_WARNING |
1da177e4 LT |
6021 | "md: md_import_device returned %ld\n", |
6022 | PTR_ERR(rdev)); | |
6023 | return PTR_ERR(rdev); | |
6024 | } | |
1a855a06 | 6025 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
6026 | if (!mddev->persistent) { |
6027 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 6028 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 6029 | rdev->raid_disk = info->raid_disk; |
bf572541 | 6030 | set_bit(In_sync, &rdev->flags); |
8313b8e5 | 6031 | clear_bit(Bitmap_sync, &rdev->flags); |
bf572541 | 6032 | } else |
41158c7e | 6033 | rdev->raid_disk = -1; |
f466722c | 6034 | rdev->saved_raid_disk = rdev->raid_disk; |
41158c7e N |
6035 | } else |
6036 | super_types[mddev->major_version]. | |
6037 | validate_super(mddev, rdev); | |
bedd86b7 | 6038 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 6039 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
6040 | /* This was a hot-add request, but events doesn't |
6041 | * match, so reject it. | |
6042 | */ | |
6043 | export_rdev(rdev); | |
6044 | return -EINVAL; | |
6045 | } | |
6046 | ||
b2d444d7 | 6047 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
6048 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
6049 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
6050 | else |
6051 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 6052 | |
f6b6ec5c SL |
6053 | if (info->state & (1<<MD_DISK_JOURNAL)) { |
6054 | struct md_rdev *rdev2; | |
6055 | bool has_journal = false; | |
6056 | ||
6057 | /* make sure no existing journal disk */ | |
6058 | rdev_for_each(rdev2, mddev) { | |
6059 | if (test_bit(Journal, &rdev2->flags)) { | |
6060 | has_journal = true; | |
6061 | break; | |
6062 | } | |
6063 | } | |
6064 | if (has_journal) { | |
6065 | export_rdev(rdev); | |
6066 | return -EBUSY; | |
6067 | } | |
bac624f3 | 6068 | set_bit(Journal, &rdev->flags); |
f6b6ec5c | 6069 | } |
1aee41f6 GR |
6070 | /* |
6071 | * check whether the device shows up in other nodes | |
6072 | */ | |
6073 | if (mddev_is_clustered(mddev)) { | |
dbb64f86 | 6074 | if (info->state & (1 << MD_DISK_CANDIDATE)) |
1aee41f6 | 6075 | set_bit(Candidate, &rdev->flags); |
dbb64f86 | 6076 | else if (info->state & (1 << MD_DISK_CLUSTER_ADD)) { |
1aee41f6 | 6077 | /* --add initiated by this node */ |
dbb64f86 | 6078 | err = md_cluster_ops->add_new_disk(mddev, rdev); |
1aee41f6 | 6079 | if (err) { |
1aee41f6 GR |
6080 | export_rdev(rdev); |
6081 | return err; | |
6082 | } | |
6083 | } | |
6084 | } | |
6085 | ||
1da177e4 LT |
6086 | rdev->raid_disk = -1; |
6087 | err = bind_rdev_to_array(rdev, mddev); | |
dbb64f86 | 6088 | |
1da177e4 LT |
6089 | if (err) |
6090 | export_rdev(rdev); | |
dbb64f86 GR |
6091 | |
6092 | if (mddev_is_clustered(mddev)) { | |
6093 | if (info->state & (1 << MD_DISK_CANDIDATE)) | |
6094 | md_cluster_ops->new_disk_ack(mddev, (err == 0)); | |
6095 | else { | |
6096 | if (err) | |
6097 | md_cluster_ops->add_new_disk_cancel(mddev); | |
6098 | else | |
6099 | err = add_bound_rdev(rdev); | |
6100 | } | |
6101 | ||
6102 | } else if (!err) | |
a6da4ef8 | 6103 | err = add_bound_rdev(rdev); |
dbb64f86 | 6104 | |
1da177e4 LT |
6105 | return err; |
6106 | } | |
6107 | ||
6108 | /* otherwise, add_new_disk is only allowed | |
6109 | * for major_version==0 superblocks | |
6110 | */ | |
6111 | if (mddev->major_version != 0) { | |
6112 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
6113 | mdname(mddev)); | |
6114 | return -EINVAL; | |
6115 | } | |
6116 | ||
6117 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
6118 | int err; | |
d710e138 | 6119 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 6120 | if (IS_ERR(rdev)) { |
f72ffdd6 | 6121 | printk(KERN_WARNING |
1da177e4 LT |
6122 | "md: error, md_import_device() returned %ld\n", |
6123 | PTR_ERR(rdev)); | |
6124 | return PTR_ERR(rdev); | |
6125 | } | |
6126 | rdev->desc_nr = info->number; | |
6127 | if (info->raid_disk < mddev->raid_disks) | |
6128 | rdev->raid_disk = info->raid_disk; | |
6129 | else | |
6130 | rdev->raid_disk = -1; | |
6131 | ||
1da177e4 | 6132 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
6133 | if (info->state & (1<<MD_DISK_SYNC)) |
6134 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 6135 | |
8ddf9efe N |
6136 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
6137 | set_bit(WriteMostly, &rdev->flags); | |
6138 | ||
1da177e4 LT |
6139 | if (!mddev->persistent) { |
6140 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
6141 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
6142 | } else | |
57b2caa3 | 6143 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 6144 | rdev->sectors = rdev->sb_start; |
1da177e4 | 6145 | |
2bf071bf N |
6146 | err = bind_rdev_to_array(rdev, mddev); |
6147 | if (err) { | |
6148 | export_rdev(rdev); | |
6149 | return err; | |
6150 | } | |
1da177e4 LT |
6151 | } |
6152 | ||
6153 | return 0; | |
6154 | } | |
6155 | ||
f72ffdd6 | 6156 | static int hot_remove_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
6157 | { |
6158 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 6159 | struct md_rdev *rdev; |
1da177e4 | 6160 | |
1da177e4 LT |
6161 | rdev = find_rdev(mddev, dev); |
6162 | if (!rdev) | |
6163 | return -ENXIO; | |
6164 | ||
2910ff17 GR |
6165 | if (rdev->raid_disk < 0) |
6166 | goto kick_rdev; | |
293467aa | 6167 | |
3ea8929d N |
6168 | clear_bit(Blocked, &rdev->flags); |
6169 | remove_and_add_spares(mddev, rdev); | |
6170 | ||
1da177e4 LT |
6171 | if (rdev->raid_disk >= 0) |
6172 | goto busy; | |
6173 | ||
2910ff17 | 6174 | kick_rdev: |
54a88392 | 6175 | if (mddev_is_clustered(mddev)) |
88bcfef7 GR |
6176 | md_cluster_ops->remove_disk(mddev, rdev); |
6177 | ||
fb56dfef | 6178 | md_kick_rdev_from_array(rdev); |
850b2b42 | 6179 | md_update_sb(mddev, 1); |
d7603b7e | 6180 | md_new_event(mddev); |
1da177e4 LT |
6181 | |
6182 | return 0; | |
6183 | busy: | |
fdefa4d8 | 6184 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
6185 | bdevname(rdev->bdev,b), mdname(mddev)); |
6186 | return -EBUSY; | |
6187 | } | |
6188 | ||
f72ffdd6 | 6189 | static int hot_add_disk(struct mddev *mddev, dev_t dev) |
1da177e4 LT |
6190 | { |
6191 | char b[BDEVNAME_SIZE]; | |
6192 | int err; | |
3cb03002 | 6193 | struct md_rdev *rdev; |
1da177e4 LT |
6194 | |
6195 | if (!mddev->pers) | |
6196 | return -ENODEV; | |
6197 | ||
6198 | if (mddev->major_version != 0) { | |
6199 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
6200 | " version-0 superblocks.\n", | |
6201 | mdname(mddev)); | |
6202 | return -EINVAL; | |
6203 | } | |
6204 | if (!mddev->pers->hot_add_disk) { | |
f72ffdd6 | 6205 | printk(KERN_WARNING |
1da177e4 LT |
6206 | "%s: personality does not support diskops!\n", |
6207 | mdname(mddev)); | |
6208 | return -EINVAL; | |
6209 | } | |
6210 | ||
d710e138 | 6211 | rdev = md_import_device(dev, -1, 0); |
1da177e4 | 6212 | if (IS_ERR(rdev)) { |
f72ffdd6 | 6213 | printk(KERN_WARNING |
1da177e4 LT |
6214 | "md: error, md_import_device() returned %ld\n", |
6215 | PTR_ERR(rdev)); | |
6216 | return -EINVAL; | |
6217 | } | |
6218 | ||
6219 | if (mddev->persistent) | |
57b2caa3 | 6220 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 6221 | else |
77304d2a | 6222 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 6223 | |
8190e754 | 6224 | rdev->sectors = rdev->sb_start; |
1da177e4 | 6225 | |
b2d444d7 | 6226 | if (test_bit(Faulty, &rdev->flags)) { |
f72ffdd6 | 6227 | printk(KERN_WARNING |
1da177e4 LT |
6228 | "md: can not hot-add faulty %s disk to %s!\n", |
6229 | bdevname(rdev->bdev,b), mdname(mddev)); | |
6230 | err = -EINVAL; | |
6231 | goto abort_export; | |
6232 | } | |
293467aa | 6233 | |
b2d444d7 | 6234 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 6235 | rdev->desc_nr = -1; |
5842730d | 6236 | rdev->saved_raid_disk = -1; |
2bf071bf N |
6237 | err = bind_rdev_to_array(rdev, mddev); |
6238 | if (err) | |
2aa82191 | 6239 | goto abort_export; |
1da177e4 LT |
6240 | |
6241 | /* | |
6242 | * The rest should better be atomic, we can have disk failures | |
6243 | * noticed in interrupt contexts ... | |
6244 | */ | |
6245 | ||
1da177e4 LT |
6246 | rdev->raid_disk = -1; |
6247 | ||
850b2b42 | 6248 | md_update_sb(mddev, 1); |
1da177e4 LT |
6249 | /* |
6250 | * Kick recovery, maybe this spare has to be added to the | |
6251 | * array immediately. | |
6252 | */ | |
6253 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6254 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 6255 | md_new_event(mddev); |
1da177e4 LT |
6256 | return 0; |
6257 | ||
1da177e4 LT |
6258 | abort_export: |
6259 | export_rdev(rdev); | |
6260 | return err; | |
6261 | } | |
6262 | ||
fd01b88c | 6263 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c | 6264 | { |
035328c2 | 6265 | int err = 0; |
32a7627c | 6266 | |
36fa3063 | 6267 | if (mddev->pers) { |
d66b1b39 | 6268 | if (!mddev->pers->quiesce || !mddev->thread) |
36fa3063 N |
6269 | return -EBUSY; |
6270 | if (mddev->recovery || mddev->sync_thread) | |
6271 | return -EBUSY; | |
6272 | /* we should be able to change the bitmap.. */ | |
6273 | } | |
32a7627c | 6274 | |
36fa3063 | 6275 | if (fd >= 0) { |
035328c2 | 6276 | struct inode *inode; |
1e594bb2 N |
6277 | struct file *f; |
6278 | ||
6279 | if (mddev->bitmap || mddev->bitmap_info.file) | |
36fa3063 | 6280 | return -EEXIST; /* cannot add when bitmap is present */ |
1e594bb2 | 6281 | f = fget(fd); |
32a7627c | 6282 | |
1e594bb2 | 6283 | if (f == NULL) { |
36fa3063 N |
6284 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
6285 | mdname(mddev)); | |
6286 | return -EBADF; | |
6287 | } | |
6288 | ||
1e594bb2 | 6289 | inode = f->f_mapping->host; |
035328c2 N |
6290 | if (!S_ISREG(inode->i_mode)) { |
6291 | printk(KERN_ERR "%s: error: bitmap file must be a regular file\n", | |
6292 | mdname(mddev)); | |
6293 | err = -EBADF; | |
1e594bb2 | 6294 | } else if (!(f->f_mode & FMODE_WRITE)) { |
035328c2 N |
6295 | printk(KERN_ERR "%s: error: bitmap file must open for write\n", |
6296 | mdname(mddev)); | |
6297 | err = -EBADF; | |
6298 | } else if (atomic_read(&inode->i_writecount) != 1) { | |
36fa3063 N |
6299 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", |
6300 | mdname(mddev)); | |
035328c2 N |
6301 | err = -EBUSY; |
6302 | } | |
6303 | if (err) { | |
1e594bb2 | 6304 | fput(f); |
36fa3063 N |
6305 | return err; |
6306 | } | |
1e594bb2 | 6307 | mddev->bitmap_info.file = f; |
c3d9714e | 6308 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
6309 | } else if (mddev->bitmap == NULL) |
6310 | return -ENOENT; /* cannot remove what isn't there */ | |
6311 | err = 0; | |
6312 | if (mddev->pers) { | |
6313 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 6314 | if (fd >= 0) { |
f9209a32 GR |
6315 | struct bitmap *bitmap; |
6316 | ||
6317 | bitmap = bitmap_create(mddev, -1); | |
6318 | if (!IS_ERR(bitmap)) { | |
6319 | mddev->bitmap = bitmap; | |
69e51b44 | 6320 | err = bitmap_load(mddev); |
ba599aca N |
6321 | } else |
6322 | err = PTR_ERR(bitmap); | |
69e51b44 | 6323 | } |
d7375ab3 | 6324 | if (fd < 0 || err) { |
36fa3063 | 6325 | bitmap_destroy(mddev); |
d7375ab3 N |
6326 | fd = -1; /* make sure to put the file */ |
6327 | } | |
36fa3063 | 6328 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
6329 | } |
6330 | if (fd < 0) { | |
4af1a041 N |
6331 | struct file *f = mddev->bitmap_info.file; |
6332 | if (f) { | |
6333 | spin_lock(&mddev->lock); | |
6334 | mddev->bitmap_info.file = NULL; | |
6335 | spin_unlock(&mddev->lock); | |
6336 | fput(f); | |
6337 | } | |
36fa3063 N |
6338 | } |
6339 | ||
32a7627c N |
6340 | return err; |
6341 | } | |
6342 | ||
1da177e4 LT |
6343 | /* |
6344 | * set_array_info is used two different ways | |
6345 | * The original usage is when creating a new array. | |
6346 | * In this usage, raid_disks is > 0 and it together with | |
6347 | * level, size, not_persistent,layout,chunksize determine the | |
6348 | * shape of the array. | |
6349 | * This will always create an array with a type-0.90.0 superblock. | |
6350 | * The newer usage is when assembling an array. | |
6351 | * In this case raid_disks will be 0, and the major_version field is | |
6352 | * use to determine which style super-blocks are to be found on the devices. | |
6353 | * The minor and patch _version numbers are also kept incase the | |
6354 | * super_block handler wishes to interpret them. | |
6355 | */ | |
f72ffdd6 | 6356 | static int set_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6357 | { |
6358 | ||
6359 | if (info->raid_disks == 0) { | |
6360 | /* just setting version number for superblock loading */ | |
6361 | if (info->major_version < 0 || | |
50511da3 | 6362 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
6363 | super_types[info->major_version].name == NULL) { |
6364 | /* maybe try to auto-load a module? */ | |
f72ffdd6 | 6365 | printk(KERN_INFO |
1da177e4 LT |
6366 | "md: superblock version %d not known\n", |
6367 | info->major_version); | |
6368 | return -EINVAL; | |
6369 | } | |
6370 | mddev->major_version = info->major_version; | |
6371 | mddev->minor_version = info->minor_version; | |
6372 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 6373 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
6374 | /* ensure mddev_put doesn't delete this now that there |
6375 | * is some minimal configuration. | |
6376 | */ | |
9ebc6ef1 | 6377 | mddev->ctime = ktime_get_real_seconds(); |
1da177e4 LT |
6378 | return 0; |
6379 | } | |
6380 | mddev->major_version = MD_MAJOR_VERSION; | |
6381 | mddev->minor_version = MD_MINOR_VERSION; | |
6382 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
9ebc6ef1 | 6383 | mddev->ctime = ktime_get_real_seconds(); |
1da177e4 LT |
6384 | |
6385 | mddev->level = info->level; | |
17115e03 | 6386 | mddev->clevel[0] = 0; |
58c0fed4 | 6387 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
6388 | mddev->raid_disks = info->raid_disks; |
6389 | /* don't set md_minor, it is determined by which /dev/md* was | |
6390 | * openned | |
6391 | */ | |
6392 | if (info->state & (1<<MD_SB_CLEAN)) | |
6393 | mddev->recovery_cp = MaxSector; | |
6394 | else | |
6395 | mddev->recovery_cp = 0; | |
6396 | mddev->persistent = ! info->not_persistent; | |
e691063a | 6397 | mddev->external = 0; |
1da177e4 LT |
6398 | |
6399 | mddev->layout = info->layout; | |
9d8f0363 | 6400 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
6401 | |
6402 | mddev->max_disks = MD_SB_DISKS; | |
6403 | ||
e691063a N |
6404 | if (mddev->persistent) |
6405 | mddev->flags = 0; | |
850b2b42 | 6406 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6407 | |
c3d9714e | 6408 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 6409 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 6410 | mddev->bitmap_info.offset = 0; |
b2a2703c | 6411 | |
f6705578 N |
6412 | mddev->reshape_position = MaxSector; |
6413 | ||
1da177e4 LT |
6414 | /* |
6415 | * Generate a 128 bit UUID | |
6416 | */ | |
6417 | get_random_bytes(mddev->uuid, 16); | |
6418 | ||
f6705578 | 6419 | mddev->new_level = mddev->level; |
664e7c41 | 6420 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
6421 | mddev->new_layout = mddev->layout; |
6422 | mddev->delta_disks = 0; | |
2c810cdd | 6423 | mddev->reshape_backwards = 0; |
f6705578 | 6424 | |
1da177e4 LT |
6425 | return 0; |
6426 | } | |
6427 | ||
fd01b88c | 6428 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 6429 | { |
b522adcd DW |
6430 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
6431 | ||
6432 | if (mddev->external_size) | |
6433 | return; | |
6434 | ||
1f403624 DW |
6435 | mddev->array_sectors = array_sectors; |
6436 | } | |
6437 | EXPORT_SYMBOL(md_set_array_sectors); | |
6438 | ||
fd01b88c | 6439 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6440 | { |
3cb03002 | 6441 | struct md_rdev *rdev; |
a35b0d69 | 6442 | int rv; |
d71f9f88 | 6443 | int fit = (num_sectors == 0); |
a35b0d69 | 6444 | |
ab5a98b1 GJ |
6445 | /* cluster raid doesn't support update size */ |
6446 | if (mddev_is_clustered(mddev)) | |
6447 | return -EINVAL; | |
6448 | ||
a35b0d69 N |
6449 | if (mddev->pers->resize == NULL) |
6450 | return -EINVAL; | |
d71f9f88 AN |
6451 | /* The "num_sectors" is the number of sectors of each device that |
6452 | * is used. This can only make sense for arrays with redundancy. | |
6453 | * linear and raid0 always use whatever space is available. We can only | |
6454 | * consider changing this number if no resync or reconstruction is | |
6455 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6456 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6457 | * of each device. If num_sectors is zero, we find the largest size |
6458 | * that fits. | |
a35b0d69 | 6459 | */ |
f851b60d N |
6460 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
6461 | mddev->sync_thread) | |
a35b0d69 | 6462 | return -EBUSY; |
bd8839e0 N |
6463 | if (mddev->ro) |
6464 | return -EROFS; | |
a4a6125a | 6465 | |
dafb20fa | 6466 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6467 | sector_t avail = rdev->sectors; |
01ab5662 | 6468 | |
d71f9f88 AN |
6469 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6470 | num_sectors = avail; | |
6471 | if (avail < num_sectors) | |
a35b0d69 N |
6472 | return -ENOSPC; |
6473 | } | |
d71f9f88 | 6474 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6475 | if (!rv) |
6476 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6477 | return rv; |
6478 | } | |
6479 | ||
fd01b88c | 6480 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6481 | { |
6482 | int rv; | |
c6563a8c | 6483 | struct md_rdev *rdev; |
da943b99 | 6484 | /* change the number of raid disks */ |
63c70c4f | 6485 | if (mddev->pers->check_reshape == NULL) |
da943b99 | 6486 | return -EINVAL; |
bd8839e0 N |
6487 | if (mddev->ro) |
6488 | return -EROFS; | |
da943b99 | 6489 | if (raid_disks <= 0 || |
233fca36 | 6490 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6491 | return -EINVAL; |
f851b60d N |
6492 | if (mddev->sync_thread || |
6493 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
6494 | mddev->reshape_position != MaxSector) | |
da943b99 | 6495 | return -EBUSY; |
c6563a8c N |
6496 | |
6497 | rdev_for_each(rdev, mddev) { | |
6498 | if (mddev->raid_disks < raid_disks && | |
6499 | rdev->data_offset < rdev->new_data_offset) | |
6500 | return -EINVAL; | |
6501 | if (mddev->raid_disks > raid_disks && | |
6502 | rdev->data_offset > rdev->new_data_offset) | |
6503 | return -EINVAL; | |
6504 | } | |
6505 | ||
63c70c4f | 6506 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6507 | if (mddev->delta_disks < 0) |
6508 | mddev->reshape_backwards = 1; | |
6509 | else if (mddev->delta_disks > 0) | |
6510 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6511 | |
6512 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6513 | if (rv < 0) { |
de171cb9 | 6514 | mddev->delta_disks = 0; |
2c810cdd N |
6515 | mddev->reshape_backwards = 0; |
6516 | } | |
da943b99 N |
6517 | return rv; |
6518 | } | |
6519 | ||
1da177e4 LT |
6520 | /* |
6521 | * update_array_info is used to change the configuration of an | |
6522 | * on-line array. | |
6523 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6524 | * fields in the info are checked against the array. | |
6525 | * Any differences that cannot be handled will cause an error. | |
6526 | * Normally, only one change can be managed at a time. | |
6527 | */ | |
fd01b88c | 6528 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6529 | { |
6530 | int rv = 0; | |
6531 | int cnt = 0; | |
36fa3063 N |
6532 | int state = 0; |
6533 | ||
6534 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6535 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6536 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6537 | |
6538 | if (mddev->major_version != info->major_version || | |
6539 | mddev->minor_version != info->minor_version || | |
6540 | /* mddev->patch_version != info->patch_version || */ | |
6541 | mddev->ctime != info->ctime || | |
6542 | mddev->level != info->level || | |
6543 | /* mddev->layout != info->layout || */ | |
4e023612 | 6544 | mddev->persistent != !info->not_persistent || |
9d8f0363 | 6545 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6546 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6547 | ((state^info->state) & 0xfffffe00) | |
6548 | ) | |
1da177e4 LT |
6549 | return -EINVAL; |
6550 | /* Check there is only one change */ | |
58c0fed4 AN |
6551 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6552 | cnt++; | |
6553 | if (mddev->raid_disks != info->raid_disks) | |
6554 | cnt++; | |
6555 | if (mddev->layout != info->layout) | |
6556 | cnt++; | |
6557 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6558 | cnt++; | |
6559 | if (cnt == 0) | |
6560 | return 0; | |
6561 | if (cnt > 1) | |
6562 | return -EINVAL; | |
1da177e4 LT |
6563 | |
6564 | if (mddev->layout != info->layout) { | |
6565 | /* Change layout | |
6566 | * we don't need to do anything at the md level, the | |
6567 | * personality will take care of it all. | |
6568 | */ | |
50ac168a | 6569 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6570 | return -EINVAL; |
597a711b N |
6571 | else { |
6572 | mddev->new_layout = info->layout; | |
50ac168a | 6573 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6574 | if (rv) |
6575 | mddev->new_layout = mddev->layout; | |
6576 | return rv; | |
6577 | } | |
1da177e4 | 6578 | } |
58c0fed4 | 6579 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6580 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6581 | |
da943b99 N |
6582 | if (mddev->raid_disks != info->raid_disks) |
6583 | rv = update_raid_disks(mddev, info->raid_disks); | |
6584 | ||
36fa3063 | 6585 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
293467aa GR |
6586 | if (mddev->pers->quiesce == NULL || mddev->thread == NULL) { |
6587 | rv = -EINVAL; | |
6588 | goto err; | |
6589 | } | |
6590 | if (mddev->recovery || mddev->sync_thread) { | |
6591 | rv = -EBUSY; | |
6592 | goto err; | |
6593 | } | |
36fa3063 | 6594 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { |
f9209a32 | 6595 | struct bitmap *bitmap; |
36fa3063 | 6596 | /* add the bitmap */ |
293467aa GR |
6597 | if (mddev->bitmap) { |
6598 | rv = -EEXIST; | |
6599 | goto err; | |
6600 | } | |
6601 | if (mddev->bitmap_info.default_offset == 0) { | |
6602 | rv = -EINVAL; | |
6603 | goto err; | |
6604 | } | |
c3d9714e N |
6605 | mddev->bitmap_info.offset = |
6606 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6607 | mddev->bitmap_info.space = |
6608 | mddev->bitmap_info.default_space; | |
36fa3063 | 6609 | mddev->pers->quiesce(mddev, 1); |
f9209a32 GR |
6610 | bitmap = bitmap_create(mddev, -1); |
6611 | if (!IS_ERR(bitmap)) { | |
6612 | mddev->bitmap = bitmap; | |
69e51b44 | 6613 | rv = bitmap_load(mddev); |
ba599aca N |
6614 | } else |
6615 | rv = PTR_ERR(bitmap); | |
36fa3063 N |
6616 | if (rv) |
6617 | bitmap_destroy(mddev); | |
6618 | mddev->pers->quiesce(mddev, 0); | |
6619 | } else { | |
6620 | /* remove the bitmap */ | |
293467aa GR |
6621 | if (!mddev->bitmap) { |
6622 | rv = -ENOENT; | |
6623 | goto err; | |
6624 | } | |
6625 | if (mddev->bitmap->storage.file) { | |
6626 | rv = -EINVAL; | |
6627 | goto err; | |
6628 | } | |
f6a2dc64 GJ |
6629 | if (mddev->bitmap_info.nodes) { |
6630 | /* hold PW on all the bitmap lock */ | |
6631 | if (md_cluster_ops->lock_all_bitmaps(mddev) <= 0) { | |
6632 | printk("md: can't change bitmap to none since the" | |
6633 | " array is in use by more than one node\n"); | |
6634 | rv = -EPERM; | |
6635 | md_cluster_ops->unlock_all_bitmaps(mddev); | |
6636 | goto err; | |
6637 | } | |
6638 | ||
6639 | mddev->bitmap_info.nodes = 0; | |
6640 | md_cluster_ops->leave(mddev); | |
6641 | } | |
36fa3063 N |
6642 | mddev->pers->quiesce(mddev, 1); |
6643 | bitmap_destroy(mddev); | |
6644 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6645 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6646 | } |
6647 | } | |
850b2b42 | 6648 | md_update_sb(mddev, 1); |
293467aa GR |
6649 | return rv; |
6650 | err: | |
1da177e4 LT |
6651 | return rv; |
6652 | } | |
6653 | ||
fd01b88c | 6654 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6655 | { |
3cb03002 | 6656 | struct md_rdev *rdev; |
1ca69c4b | 6657 | int err = 0; |
1da177e4 LT |
6658 | |
6659 | if (mddev->pers == NULL) | |
6660 | return -ENODEV; | |
6661 | ||
1ca69c4b N |
6662 | rcu_read_lock(); |
6663 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6664 | if (!rdev) |
1ca69c4b N |
6665 | err = -ENODEV; |
6666 | else { | |
6667 | md_error(mddev, rdev); | |
6668 | if (!test_bit(Faulty, &rdev->flags)) | |
6669 | err = -EBUSY; | |
6670 | } | |
6671 | rcu_read_unlock(); | |
6672 | return err; | |
1da177e4 LT |
6673 | } |
6674 | ||
2f9618ce AN |
6675 | /* |
6676 | * We have a problem here : there is no easy way to give a CHS | |
6677 | * virtual geometry. We currently pretend that we have a 2 heads | |
6678 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6679 | * dosfs just mad... ;-) | |
6680 | */ | |
a885c8c4 CH |
6681 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6682 | { | |
fd01b88c | 6683 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6684 | |
6685 | geo->heads = 2; | |
6686 | geo->sectors = 4; | |
49ce6cea | 6687 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6688 | return 0; |
6689 | } | |
6690 | ||
cb335f88 NS |
6691 | static inline bool md_ioctl_valid(unsigned int cmd) |
6692 | { | |
6693 | switch (cmd) { | |
6694 | case ADD_NEW_DISK: | |
6695 | case BLKROSET: | |
6696 | case GET_ARRAY_INFO: | |
6697 | case GET_BITMAP_FILE: | |
6698 | case GET_DISK_INFO: | |
6699 | case HOT_ADD_DISK: | |
6700 | case HOT_REMOVE_DISK: | |
cb335f88 NS |
6701 | case RAID_AUTORUN: |
6702 | case RAID_VERSION: | |
6703 | case RESTART_ARRAY_RW: | |
6704 | case RUN_ARRAY: | |
6705 | case SET_ARRAY_INFO: | |
6706 | case SET_BITMAP_FILE: | |
6707 | case SET_DISK_FAULTY: | |
6708 | case STOP_ARRAY: | |
6709 | case STOP_ARRAY_RO: | |
1aee41f6 | 6710 | case CLUSTERED_DISK_NACK: |
cb335f88 NS |
6711 | return true; |
6712 | default: | |
6713 | return false; | |
6714 | } | |
6715 | } | |
6716 | ||
a39907fa | 6717 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6718 | unsigned int cmd, unsigned long arg) |
6719 | { | |
6720 | int err = 0; | |
6721 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6722 | struct mddev *mddev = NULL; |
e2218350 | 6723 | int ro; |
1da177e4 | 6724 | |
cb335f88 NS |
6725 | if (!md_ioctl_valid(cmd)) |
6726 | return -ENOTTY; | |
6727 | ||
506c9e44 N |
6728 | switch (cmd) { |
6729 | case RAID_VERSION: | |
6730 | case GET_ARRAY_INFO: | |
6731 | case GET_DISK_INFO: | |
6732 | break; | |
6733 | default: | |
6734 | if (!capable(CAP_SYS_ADMIN)) | |
6735 | return -EACCES; | |
6736 | } | |
1da177e4 LT |
6737 | |
6738 | /* | |
6739 | * Commands dealing with the RAID driver but not any | |
6740 | * particular array: | |
6741 | */ | |
c02c0aeb N |
6742 | switch (cmd) { |
6743 | case RAID_VERSION: | |
6744 | err = get_version(argp); | |
3adc28d8 | 6745 | goto out; |
1da177e4 | 6746 | |
1da177e4 | 6747 | #ifndef MODULE |
c02c0aeb N |
6748 | case RAID_AUTORUN: |
6749 | err = 0; | |
6750 | autostart_arrays(arg); | |
3adc28d8 | 6751 | goto out; |
1da177e4 | 6752 | #endif |
c02c0aeb | 6753 | default:; |
1da177e4 LT |
6754 | } |
6755 | ||
6756 | /* | |
6757 | * Commands creating/starting a new array: | |
6758 | */ | |
6759 | ||
a39907fa | 6760 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6761 | |
6762 | if (!mddev) { | |
6763 | BUG(); | |
3adc28d8 | 6764 | goto out; |
1da177e4 LT |
6765 | } |
6766 | ||
1ca69c4b N |
6767 | /* Some actions do not requires the mutex */ |
6768 | switch (cmd) { | |
6769 | case GET_ARRAY_INFO: | |
6770 | if (!mddev->raid_disks && !mddev->external) | |
6771 | err = -ENODEV; | |
6772 | else | |
6773 | err = get_array_info(mddev, argp); | |
3adc28d8 | 6774 | goto out; |
1ca69c4b N |
6775 | |
6776 | case GET_DISK_INFO: | |
6777 | if (!mddev->raid_disks && !mddev->external) | |
6778 | err = -ENODEV; | |
6779 | else | |
6780 | err = get_disk_info(mddev, argp); | |
3adc28d8 | 6781 | goto out; |
1ca69c4b N |
6782 | |
6783 | case SET_DISK_FAULTY: | |
6784 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6785 | goto out; |
4af1a041 N |
6786 | |
6787 | case GET_BITMAP_FILE: | |
6788 | err = get_bitmap_file(mddev, argp); | |
6789 | goto out; | |
6790 | ||
1ca69c4b N |
6791 | } |
6792 | ||
a7a3f08d N |
6793 | if (cmd == ADD_NEW_DISK) |
6794 | /* need to ensure md_delayed_delete() has completed */ | |
6795 | flush_workqueue(md_misc_wq); | |
6796 | ||
90f5f7ad HR |
6797 | if (cmd == HOT_REMOVE_DISK) |
6798 | /* need to ensure recovery thread has run */ | |
6799 | wait_event_interruptible_timeout(mddev->sb_wait, | |
6800 | !test_bit(MD_RECOVERY_NEEDED, | |
6801 | &mddev->flags), | |
6802 | msecs_to_jiffies(5000)); | |
260fa034 N |
6803 | if (cmd == STOP_ARRAY || cmd == STOP_ARRAY_RO) { |
6804 | /* Need to flush page cache, and ensure no-one else opens | |
6805 | * and writes | |
6806 | */ | |
6807 | mutex_lock(&mddev->open_mutex); | |
9ba3b7f5 | 6808 | if (mddev->pers && atomic_read(&mddev->openers) > 1) { |
260fa034 N |
6809 | mutex_unlock(&mddev->open_mutex); |
6810 | err = -EBUSY; | |
3adc28d8 | 6811 | goto out; |
260fa034 N |
6812 | } |
6813 | set_bit(MD_STILL_CLOSED, &mddev->flags); | |
6814 | mutex_unlock(&mddev->open_mutex); | |
6815 | sync_blockdev(bdev); | |
6816 | } | |
1da177e4 LT |
6817 | err = mddev_lock(mddev); |
6818 | if (err) { | |
f72ffdd6 | 6819 | printk(KERN_INFO |
1da177e4 LT |
6820 | "md: ioctl lock interrupted, reason %d, cmd %d\n", |
6821 | err, cmd); | |
3adc28d8 | 6822 | goto out; |
1da177e4 LT |
6823 | } |
6824 | ||
c02c0aeb N |
6825 | if (cmd == SET_ARRAY_INFO) { |
6826 | mdu_array_info_t info; | |
6827 | if (!arg) | |
6828 | memset(&info, 0, sizeof(info)); | |
6829 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6830 | err = -EFAULT; | |
3adc28d8 | 6831 | goto unlock; |
c02c0aeb N |
6832 | } |
6833 | if (mddev->pers) { | |
6834 | err = update_array_info(mddev, &info); | |
6835 | if (err) { | |
6836 | printk(KERN_WARNING "md: couldn't update" | |
6837 | " array info. %d\n", err); | |
3adc28d8 | 6838 | goto unlock; |
1da177e4 | 6839 | } |
3adc28d8 | 6840 | goto unlock; |
c02c0aeb N |
6841 | } |
6842 | if (!list_empty(&mddev->disks)) { | |
6843 | printk(KERN_WARNING | |
6844 | "md: array %s already has disks!\n", | |
6845 | mdname(mddev)); | |
6846 | err = -EBUSY; | |
3adc28d8 | 6847 | goto unlock; |
c02c0aeb N |
6848 | } |
6849 | if (mddev->raid_disks) { | |
6850 | printk(KERN_WARNING | |
6851 | "md: array %s already initialised!\n", | |
6852 | mdname(mddev)); | |
6853 | err = -EBUSY; | |
3adc28d8 | 6854 | goto unlock; |
c02c0aeb N |
6855 | } |
6856 | err = set_array_info(mddev, &info); | |
6857 | if (err) { | |
6858 | printk(KERN_WARNING "md: couldn't set" | |
6859 | " array info. %d\n", err); | |
3adc28d8 | 6860 | goto unlock; |
c02c0aeb | 6861 | } |
3adc28d8 | 6862 | goto unlock; |
1da177e4 LT |
6863 | } |
6864 | ||
6865 | /* | |
6866 | * Commands querying/configuring an existing array: | |
6867 | */ | |
32a7627c | 6868 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6869 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6870 | if ((!mddev->raid_disks && !mddev->external) |
6871 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6872 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6873 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 | 6874 | err = -ENODEV; |
3adc28d8 | 6875 | goto unlock; |
1da177e4 LT |
6876 | } |
6877 | ||
6878 | /* | |
6879 | * Commands even a read-only array can execute: | |
6880 | */ | |
c02c0aeb | 6881 | switch (cmd) { |
c02c0aeb N |
6882 | case RESTART_ARRAY_RW: |
6883 | err = restart_array(mddev); | |
3adc28d8 | 6884 | goto unlock; |
1da177e4 | 6885 | |
c02c0aeb N |
6886 | case STOP_ARRAY: |
6887 | err = do_md_stop(mddev, 0, bdev); | |
3adc28d8 | 6888 | goto unlock; |
1da177e4 | 6889 | |
c02c0aeb N |
6890 | case STOP_ARRAY_RO: |
6891 | err = md_set_readonly(mddev, bdev); | |
3adc28d8 | 6892 | goto unlock; |
1da177e4 | 6893 | |
3ea8929d N |
6894 | case HOT_REMOVE_DISK: |
6895 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6896 | goto unlock; |
3ea8929d | 6897 | |
7ceb17e8 N |
6898 | case ADD_NEW_DISK: |
6899 | /* We can support ADD_NEW_DISK on read-only arrays | |
466ad292 | 6900 | * only if we are re-adding a preexisting device. |
7ceb17e8 N |
6901 | * So require mddev->pers and MD_DISK_SYNC. |
6902 | */ | |
6903 | if (mddev->pers) { | |
6904 | mdu_disk_info_t info; | |
6905 | if (copy_from_user(&info, argp, sizeof(info))) | |
6906 | err = -EFAULT; | |
6907 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6908 | /* Need to clear read-only for this */ | |
6909 | break; | |
6910 | else | |
6911 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6912 | goto unlock; |
7ceb17e8 N |
6913 | } |
6914 | break; | |
6915 | ||
c02c0aeb N |
6916 | case BLKROSET: |
6917 | if (get_user(ro, (int __user *)(arg))) { | |
6918 | err = -EFAULT; | |
3adc28d8 | 6919 | goto unlock; |
c02c0aeb N |
6920 | } |
6921 | err = -EINVAL; | |
e2218350 | 6922 | |
c02c0aeb N |
6923 | /* if the bdev is going readonly the value of mddev->ro |
6924 | * does not matter, no writes are coming | |
6925 | */ | |
6926 | if (ro) | |
3adc28d8 | 6927 | goto unlock; |
e2218350 | 6928 | |
c02c0aeb N |
6929 | /* are we are already prepared for writes? */ |
6930 | if (mddev->ro != 1) | |
3adc28d8 | 6931 | goto unlock; |
e2218350 | 6932 | |
c02c0aeb N |
6933 | /* transitioning to readauto need only happen for |
6934 | * arrays that call md_write_start | |
6935 | */ | |
6936 | if (mddev->pers) { | |
6937 | err = restart_array(mddev); | |
6938 | if (err == 0) { | |
6939 | mddev->ro = 2; | |
6940 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6941 | } |
c02c0aeb | 6942 | } |
3adc28d8 | 6943 | goto unlock; |
1da177e4 LT |
6944 | } |
6945 | ||
6946 | /* | |
6947 | * The remaining ioctls are changing the state of the | |
f91de92e | 6948 | * superblock, so we do not allow them on read-only arrays. |
1da177e4 | 6949 | */ |
326eb17d | 6950 | if (mddev->ro && mddev->pers) { |
f91de92e N |
6951 | if (mddev->ro == 2) { |
6952 | mddev->ro = 0; | |
00bcb4ac | 6953 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6954 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6955 | /* mddev_unlock will wake thread */ |
6956 | /* If a device failed while we were read-only, we | |
6957 | * need to make sure the metadata is updated now. | |
6958 | */ | |
6959 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6960 | mddev_unlock(mddev); | |
6961 | wait_event(mddev->sb_wait, | |
6962 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6963 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
29f097c4 | 6964 | mddev_lock_nointr(mddev); |
f3378b48 | 6965 | } |
f91de92e N |
6966 | } else { |
6967 | err = -EROFS; | |
3adc28d8 | 6968 | goto unlock; |
f91de92e | 6969 | } |
1da177e4 LT |
6970 | } |
6971 | ||
c02c0aeb N |
6972 | switch (cmd) { |
6973 | case ADD_NEW_DISK: | |
1da177e4 | 6974 | { |
c02c0aeb N |
6975 | mdu_disk_info_t info; |
6976 | if (copy_from_user(&info, argp, sizeof(info))) | |
6977 | err = -EFAULT; | |
6978 | else | |
6979 | err = add_new_disk(mddev, &info); | |
3adc28d8 | 6980 | goto unlock; |
c02c0aeb | 6981 | } |
1da177e4 | 6982 | |
1aee41f6 GR |
6983 | case CLUSTERED_DISK_NACK: |
6984 | if (mddev_is_clustered(mddev)) | |
6985 | md_cluster_ops->new_disk_ack(mddev, false); | |
6986 | else | |
6987 | err = -EINVAL; | |
6988 | goto unlock; | |
6989 | ||
c02c0aeb N |
6990 | case HOT_ADD_DISK: |
6991 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3adc28d8 | 6992 | goto unlock; |
1da177e4 | 6993 | |
c02c0aeb N |
6994 | case RUN_ARRAY: |
6995 | err = do_md_run(mddev); | |
3adc28d8 | 6996 | goto unlock; |
1da177e4 | 6997 | |
c02c0aeb N |
6998 | case SET_BITMAP_FILE: |
6999 | err = set_bitmap_file(mddev, (int)arg); | |
3adc28d8 | 7000 | goto unlock; |
32a7627c | 7001 | |
c02c0aeb N |
7002 | default: |
7003 | err = -EINVAL; | |
3adc28d8 | 7004 | goto unlock; |
1da177e4 LT |
7005 | } |
7006 | ||
3adc28d8 | 7007 | unlock: |
d3374825 N |
7008 | if (mddev->hold_active == UNTIL_IOCTL && |
7009 | err != -EINVAL) | |
7010 | mddev->hold_active = 0; | |
1da177e4 | 7011 | mddev_unlock(mddev); |
3adc28d8 | 7012 | out: |
1da177e4 LT |
7013 | return err; |
7014 | } | |
aa98aa31 AB |
7015 | #ifdef CONFIG_COMPAT |
7016 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
7017 | unsigned int cmd, unsigned long arg) | |
7018 | { | |
7019 | switch (cmd) { | |
7020 | case HOT_REMOVE_DISK: | |
7021 | case HOT_ADD_DISK: | |
7022 | case SET_DISK_FAULTY: | |
7023 | case SET_BITMAP_FILE: | |
7024 | /* These take in integer arg, do not convert */ | |
7025 | break; | |
7026 | default: | |
7027 | arg = (unsigned long)compat_ptr(arg); | |
7028 | break; | |
7029 | } | |
7030 | ||
7031 | return md_ioctl(bdev, mode, cmd, arg); | |
7032 | } | |
7033 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 7034 | |
a39907fa | 7035 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
7036 | { |
7037 | /* | |
7038 | * Succeed if we can lock the mddev, which confirms that | |
7039 | * it isn't being stopped right now. | |
7040 | */ | |
fd01b88c | 7041 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
7042 | int err; |
7043 | ||
0c098220 YL |
7044 | if (!mddev) |
7045 | return -ENODEV; | |
7046 | ||
d3374825 N |
7047 | if (mddev->gendisk != bdev->bd_disk) { |
7048 | /* we are racing with mddev_put which is discarding this | |
7049 | * bd_disk. | |
7050 | */ | |
7051 | mddev_put(mddev); | |
7052 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 7053 | flush_workqueue(md_misc_wq); |
d3374825 N |
7054 | /* Then retry the open from the top */ |
7055 | return -ERESTARTSYS; | |
7056 | } | |
7057 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
7058 | ||
c8c00a69 | 7059 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
7060 | goto out; |
7061 | ||
7062 | err = 0; | |
f2ea68cf | 7063 | atomic_inc(&mddev->openers); |
260fa034 | 7064 | clear_bit(MD_STILL_CLOSED, &mddev->flags); |
c8c00a69 | 7065 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 7066 | |
f0b4f7e2 | 7067 | check_disk_change(bdev); |
1da177e4 LT |
7068 | out: |
7069 | return err; | |
7070 | } | |
7071 | ||
db2a144b | 7072 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 7073 | { |
f72ffdd6 | 7074 | struct mddev *mddev = disk->private_data; |
1da177e4 | 7075 | |
52e5f9d1 | 7076 | BUG_ON(!mddev); |
f2ea68cf | 7077 | atomic_dec(&mddev->openers); |
1da177e4 | 7078 | mddev_put(mddev); |
1da177e4 | 7079 | } |
f0b4f7e2 N |
7080 | |
7081 | static int md_media_changed(struct gendisk *disk) | |
7082 | { | |
fd01b88c | 7083 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
7084 | |
7085 | return mddev->changed; | |
7086 | } | |
7087 | ||
7088 | static int md_revalidate(struct gendisk *disk) | |
7089 | { | |
fd01b88c | 7090 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
7091 | |
7092 | mddev->changed = 0; | |
7093 | return 0; | |
7094 | } | |
83d5cde4 | 7095 | static const struct block_device_operations md_fops = |
1da177e4 LT |
7096 | { |
7097 | .owner = THIS_MODULE, | |
a39907fa AV |
7098 | .open = md_open, |
7099 | .release = md_release, | |
b492b852 | 7100 | .ioctl = md_ioctl, |
aa98aa31 AB |
7101 | #ifdef CONFIG_COMPAT |
7102 | .compat_ioctl = md_compat_ioctl, | |
7103 | #endif | |
a885c8c4 | 7104 | .getgeo = md_getgeo, |
f0b4f7e2 N |
7105 | .media_changed = md_media_changed, |
7106 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
7107 | }; |
7108 | ||
f72ffdd6 | 7109 | static int md_thread(void *arg) |
1da177e4 | 7110 | { |
2b8bf345 | 7111 | struct md_thread *thread = arg; |
1da177e4 | 7112 | |
1da177e4 LT |
7113 | /* |
7114 | * md_thread is a 'system-thread', it's priority should be very | |
7115 | * high. We avoid resource deadlocks individually in each | |
7116 | * raid personality. (RAID5 does preallocation) We also use RR and | |
7117 | * the very same RT priority as kswapd, thus we will never get | |
7118 | * into a priority inversion deadlock. | |
7119 | * | |
7120 | * we definitely have to have equal or higher priority than | |
7121 | * bdflush, otherwise bdflush will deadlock if there are too | |
7122 | * many dirty RAID5 blocks. | |
7123 | */ | |
1da177e4 | 7124 | |
6985c43f | 7125 | allow_signal(SIGKILL); |
a6fb0934 | 7126 | while (!kthread_should_stop()) { |
1da177e4 | 7127 | |
93588e22 N |
7128 | /* We need to wait INTERRUPTIBLE so that |
7129 | * we don't add to the load-average. | |
7130 | * That means we need to be sure no signals are | |
7131 | * pending | |
7132 | */ | |
7133 | if (signal_pending(current)) | |
7134 | flush_signals(current); | |
7135 | ||
7136 | wait_event_interruptible_timeout | |
7137 | (thread->wqueue, | |
7138 | test_bit(THREAD_WAKEUP, &thread->flags) | |
7139 | || kthread_should_stop(), | |
7140 | thread->timeout); | |
1da177e4 | 7141 | |
6c987910 N |
7142 | clear_bit(THREAD_WAKEUP, &thread->flags); |
7143 | if (!kthread_should_stop()) | |
4ed8731d | 7144 | thread->run(thread); |
1da177e4 | 7145 | } |
a6fb0934 | 7146 | |
1da177e4 LT |
7147 | return 0; |
7148 | } | |
7149 | ||
2b8bf345 | 7150 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
7151 | { |
7152 | if (thread) { | |
36a4e1fe | 7153 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
7154 | set_bit(THREAD_WAKEUP, &thread->flags); |
7155 | wake_up(&thread->wqueue); | |
7156 | } | |
7157 | } | |
6c144d31 | 7158 | EXPORT_SYMBOL(md_wakeup_thread); |
1da177e4 | 7159 | |
4ed8731d SL |
7160 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
7161 | struct mddev *mddev, const char *name) | |
1da177e4 | 7162 | { |
2b8bf345 | 7163 | struct md_thread *thread; |
1da177e4 | 7164 | |
2b8bf345 | 7165 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
7166 | if (!thread) |
7167 | return NULL; | |
7168 | ||
1da177e4 LT |
7169 | init_waitqueue_head(&thread->wqueue); |
7170 | ||
1da177e4 LT |
7171 | thread->run = run; |
7172 | thread->mddev = mddev; | |
32a7627c | 7173 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
7174 | thread->tsk = kthread_run(md_thread, thread, |
7175 | "%s_%s", | |
7176 | mdname(thread->mddev), | |
0232605d | 7177 | name); |
a6fb0934 | 7178 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
7179 | kfree(thread); |
7180 | return NULL; | |
7181 | } | |
1da177e4 LT |
7182 | return thread; |
7183 | } | |
6c144d31 | 7184 | EXPORT_SYMBOL(md_register_thread); |
1da177e4 | 7185 | |
2b8bf345 | 7186 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 7187 | { |
2b8bf345 | 7188 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
7189 | if (!thread) |
7190 | return; | |
36a4e1fe | 7191 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
7192 | /* Locking ensures that mddev_unlock does not wake_up a |
7193 | * non-existent thread | |
7194 | */ | |
7195 | spin_lock(&pers_lock); | |
7196 | *threadp = NULL; | |
7197 | spin_unlock(&pers_lock); | |
a6fb0934 N |
7198 | |
7199 | kthread_stop(thread->tsk); | |
1da177e4 LT |
7200 | kfree(thread); |
7201 | } | |
6c144d31 | 7202 | EXPORT_SYMBOL(md_unregister_thread); |
1da177e4 | 7203 | |
fd01b88c | 7204 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 7205 | { |
b2d444d7 | 7206 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 7207 | return; |
6bfe0b49 | 7208 | |
de393cde | 7209 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
7210 | return; |
7211 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
7212 | if (mddev->degraded) |
7213 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 7214 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
7215 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7216 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7217 | md_wakeup_thread(mddev->thread); | |
768a418d | 7218 | if (mddev->event_work.func) |
e804ac78 | 7219 | queue_work(md_misc_wq, &mddev->event_work); |
bb9ef716 | 7220 | md_new_event(mddev); |
1da177e4 | 7221 | } |
6c144d31 | 7222 | EXPORT_SYMBOL(md_error); |
1da177e4 LT |
7223 | |
7224 | /* seq_file implementation /proc/mdstat */ | |
7225 | ||
7226 | static void status_unused(struct seq_file *seq) | |
7227 | { | |
7228 | int i = 0; | |
3cb03002 | 7229 | struct md_rdev *rdev; |
1da177e4 LT |
7230 | |
7231 | seq_printf(seq, "unused devices: "); | |
7232 | ||
159ec1fc | 7233 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
7234 | char b[BDEVNAME_SIZE]; |
7235 | i++; | |
7236 | seq_printf(seq, "%s ", | |
7237 | bdevname(rdev->bdev,b)); | |
7238 | } | |
7239 | if (!i) | |
7240 | seq_printf(seq, "<none>"); | |
7241 | ||
7242 | seq_printf(seq, "\n"); | |
7243 | } | |
7244 | ||
f7851be7 | 7245 | static int status_resync(struct seq_file *seq, struct mddev *mddev) |
1da177e4 | 7246 | { |
dd71cf6b N |
7247 | sector_t max_sectors, resync, res; |
7248 | unsigned long dt, db; | |
7249 | sector_t rt; | |
4588b42e N |
7250 | int scale; |
7251 | unsigned int per_milli; | |
1da177e4 | 7252 | |
c804cdec N |
7253 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
7254 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 7255 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 7256 | else |
dd71cf6b | 7257 | max_sectors = mddev->dev_sectors; |
1da177e4 | 7258 | |
f7851be7 N |
7259 | resync = mddev->curr_resync; |
7260 | if (resync <= 3) { | |
7261 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7262 | /* Still cleaning up */ | |
7263 | resync = max_sectors; | |
7264 | } else | |
7265 | resync -= atomic_read(&mddev->recovery_active); | |
7266 | ||
7267 | if (resync == 0) { | |
7268 | if (mddev->recovery_cp < MaxSector) { | |
7269 | seq_printf(seq, "\tresync=PENDING"); | |
7270 | return 1; | |
7271 | } | |
7272 | return 0; | |
7273 | } | |
7274 | if (resync < 3) { | |
7275 | seq_printf(seq, "\tresync=DELAYED"); | |
7276 | return 1; | |
7277 | } | |
7278 | ||
403df478 | 7279 | WARN_ON(max_sectors == 0); |
4588b42e | 7280 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 7281 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
7282 | * u32, as those are the requirements for sector_div. |
7283 | * Thus 'scale' must be at least 10 | |
7284 | */ | |
7285 | scale = 10; | |
7286 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 7287 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
7288 | scale++; |
7289 | } | |
7290 | res = (resync>>scale)*1000; | |
dd71cf6b | 7291 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
7292 | |
7293 | per_milli = res; | |
1da177e4 | 7294 | { |
4588b42e | 7295 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
7296 | seq_printf(seq, "["); |
7297 | for (i = 0; i < x; i++) | |
7298 | seq_printf(seq, "="); | |
7299 | seq_printf(seq, ">"); | |
7300 | for (i = 0; i < y; i++) | |
7301 | seq_printf(seq, "."); | |
7302 | seq_printf(seq, "] "); | |
7303 | } | |
4588b42e | 7304 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
7305 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
7306 | "reshape" : | |
61df9d91 N |
7307 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
7308 | "check" : | |
7309 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
7310 | "resync" : "recovery"))), | |
7311 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
7312 | (unsigned long long) resync/2, |
7313 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
7314 | |
7315 | /* | |
1da177e4 LT |
7316 | * dt: time from mark until now |
7317 | * db: blocks written from mark until now | |
7318 | * rt: remaining time | |
dd71cf6b N |
7319 | * |
7320 | * rt is a sector_t, so could be 32bit or 64bit. | |
7321 | * So we divide before multiply in case it is 32bit and close | |
7322 | * to the limit. | |
25985edc | 7323 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
7324 | * near the end of resync when the number of remaining sectors |
7325 | * is close to 'db'. | |
7326 | * We then divide rt by 32 after multiplying by db to compensate. | |
7327 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
7328 | */ |
7329 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
7330 | if (!dt) dt++; | |
ff4e8d9a N |
7331 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
7332 | - mddev->resync_mark_cnt; | |
1da177e4 | 7333 | |
dd71cf6b N |
7334 | rt = max_sectors - resync; /* number of remaining sectors */ |
7335 | sector_div(rt, db/32+1); | |
7336 | rt *= dt; | |
7337 | rt >>= 5; | |
7338 | ||
7339 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
7340 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 7341 | |
ff4e8d9a | 7342 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
f7851be7 | 7343 | return 1; |
1da177e4 LT |
7344 | } |
7345 | ||
7346 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
7347 | { | |
7348 | struct list_head *tmp; | |
7349 | loff_t l = *pos; | |
fd01b88c | 7350 | struct mddev *mddev; |
1da177e4 LT |
7351 | |
7352 | if (l >= 0x10000) | |
7353 | return NULL; | |
7354 | if (!l--) | |
7355 | /* header */ | |
7356 | return (void*)1; | |
7357 | ||
7358 | spin_lock(&all_mddevs_lock); | |
7359 | list_for_each(tmp,&all_mddevs) | |
7360 | if (!l--) { | |
fd01b88c | 7361 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
7362 | mddev_get(mddev); |
7363 | spin_unlock(&all_mddevs_lock); | |
7364 | return mddev; | |
7365 | } | |
7366 | spin_unlock(&all_mddevs_lock); | |
7367 | if (!l--) | |
7368 | return (void*)2;/* tail */ | |
7369 | return NULL; | |
7370 | } | |
7371 | ||
7372 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
7373 | { | |
7374 | struct list_head *tmp; | |
fd01b88c | 7375 | struct mddev *next_mddev, *mddev = v; |
f72ffdd6 | 7376 | |
1da177e4 LT |
7377 | ++*pos; |
7378 | if (v == (void*)2) | |
7379 | return NULL; | |
7380 | ||
7381 | spin_lock(&all_mddevs_lock); | |
7382 | if (v == (void*)1) | |
7383 | tmp = all_mddevs.next; | |
7384 | else | |
7385 | tmp = mddev->all_mddevs.next; | |
7386 | if (tmp != &all_mddevs) | |
fd01b88c | 7387 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
7388 | else { |
7389 | next_mddev = (void*)2; | |
7390 | *pos = 0x10000; | |
f72ffdd6 | 7391 | } |
1da177e4 LT |
7392 | spin_unlock(&all_mddevs_lock); |
7393 | ||
7394 | if (v != (void*)1) | |
7395 | mddev_put(mddev); | |
7396 | return next_mddev; | |
7397 | ||
7398 | } | |
7399 | ||
7400 | static void md_seq_stop(struct seq_file *seq, void *v) | |
7401 | { | |
fd01b88c | 7402 | struct mddev *mddev = v; |
1da177e4 LT |
7403 | |
7404 | if (mddev && v != (void*)1 && v != (void*)2) | |
7405 | mddev_put(mddev); | |
7406 | } | |
7407 | ||
7408 | static int md_seq_show(struct seq_file *seq, void *v) | |
7409 | { | |
fd01b88c | 7410 | struct mddev *mddev = v; |
dd8ac336 | 7411 | sector_t sectors; |
3cb03002 | 7412 | struct md_rdev *rdev; |
1da177e4 LT |
7413 | |
7414 | if (v == (void*)1) { | |
84fc4b56 | 7415 | struct md_personality *pers; |
1da177e4 LT |
7416 | seq_printf(seq, "Personalities : "); |
7417 | spin_lock(&pers_lock); | |
2604b703 N |
7418 | list_for_each_entry(pers, &pers_list, list) |
7419 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
7420 | |
7421 | spin_unlock(&pers_lock); | |
7422 | seq_printf(seq, "\n"); | |
f1514638 | 7423 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
7424 | return 0; |
7425 | } | |
7426 | if (v == (void*)2) { | |
7427 | status_unused(seq); | |
7428 | return 0; | |
7429 | } | |
7430 | ||
36d091f4 | 7431 | spin_lock(&mddev->lock); |
1da177e4 LT |
7432 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
7433 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
7434 | mddev->pers ? "" : "in"); | |
7435 | if (mddev->pers) { | |
f91de92e | 7436 | if (mddev->ro==1) |
1da177e4 | 7437 | seq_printf(seq, " (read-only)"); |
f91de92e | 7438 | if (mddev->ro==2) |
52720ae7 | 7439 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
7440 | seq_printf(seq, " %s", mddev->pers->name); |
7441 | } | |
7442 | ||
dd8ac336 | 7443 | sectors = 0; |
f97fcad3 N |
7444 | rcu_read_lock(); |
7445 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 LT |
7446 | char b[BDEVNAME_SIZE]; |
7447 | seq_printf(seq, " %s[%d]", | |
7448 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
7449 | if (test_bit(WriteMostly, &rdev->flags)) |
7450 | seq_printf(seq, "(W)"); | |
9efdca16 SL |
7451 | if (test_bit(Journal, &rdev->flags)) |
7452 | seq_printf(seq, "(J)"); | |
b2d444d7 | 7453 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7454 | seq_printf(seq, "(F)"); |
7455 | continue; | |
2d78f8c4 N |
7456 | } |
7457 | if (rdev->raid_disk < 0) | |
b325a32e | 7458 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
7459 | if (test_bit(Replacement, &rdev->flags)) |
7460 | seq_printf(seq, "(R)"); | |
dd8ac336 | 7461 | sectors += rdev->sectors; |
1da177e4 | 7462 | } |
f97fcad3 | 7463 | rcu_read_unlock(); |
1da177e4 LT |
7464 | |
7465 | if (!list_empty(&mddev->disks)) { | |
7466 | if (mddev->pers) | |
7467 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
7468 | (unsigned long long) |
7469 | mddev->array_sectors / 2); | |
1da177e4 LT |
7470 | else |
7471 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 7472 | (unsigned long long)sectors / 2); |
1da177e4 | 7473 | } |
1cd6bf19 N |
7474 | if (mddev->persistent) { |
7475 | if (mddev->major_version != 0 || | |
7476 | mddev->minor_version != 90) { | |
7477 | seq_printf(seq," super %d.%d", | |
7478 | mddev->major_version, | |
7479 | mddev->minor_version); | |
7480 | } | |
e691063a N |
7481 | } else if (mddev->external) |
7482 | seq_printf(seq, " super external:%s", | |
7483 | mddev->metadata_type); | |
7484 | else | |
1cd6bf19 | 7485 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
7486 | |
7487 | if (mddev->pers) { | |
d710e138 | 7488 | mddev->pers->status(seq, mddev); |
f72ffdd6 | 7489 | seq_printf(seq, "\n "); |
8e1b39d6 | 7490 | if (mddev->pers->sync_request) { |
f7851be7 | 7491 | if (status_resync(seq, mddev)) |
8e1b39d6 | 7492 | seq_printf(seq, "\n "); |
8e1b39d6 | 7493 | } |
32a7627c N |
7494 | } else |
7495 | seq_printf(seq, "\n "); | |
7496 | ||
57148964 | 7497 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7498 | |
7499 | seq_printf(seq, "\n"); | |
7500 | } | |
36d091f4 | 7501 | spin_unlock(&mddev->lock); |
f72ffdd6 | 7502 | |
1da177e4 LT |
7503 | return 0; |
7504 | } | |
7505 | ||
110518bc | 7506 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7507 | .start = md_seq_start, |
7508 | .next = md_seq_next, | |
7509 | .stop = md_seq_stop, | |
7510 | .show = md_seq_show, | |
7511 | }; | |
7512 | ||
7513 | static int md_seq_open(struct inode *inode, struct file *file) | |
7514 | { | |
f1514638 | 7515 | struct seq_file *seq; |
1da177e4 LT |
7516 | int error; |
7517 | ||
7518 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7519 | if (error) |
f1514638 KS |
7520 | return error; |
7521 | ||
7522 | seq = file->private_data; | |
7523 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7524 | return error; |
7525 | } | |
7526 | ||
e2f23b60 | 7527 | static int md_unloading; |
d7603b7e N |
7528 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7529 | { | |
f1514638 | 7530 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7531 | int mask; |
7532 | ||
e2f23b60 | 7533 | if (md_unloading) |
7d7e64f2 | 7534 | return POLLIN|POLLRDNORM|POLLERR|POLLPRI; |
d7603b7e N |
7535 | poll_wait(filp, &md_event_waiters, wait); |
7536 | ||
7537 | /* always allow read */ | |
7538 | mask = POLLIN | POLLRDNORM; | |
7539 | ||
f1514638 | 7540 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7541 | mask |= POLLERR | POLLPRI; |
7542 | return mask; | |
7543 | } | |
7544 | ||
fa027c2a | 7545 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7546 | .owner = THIS_MODULE, |
1da177e4 LT |
7547 | .open = md_seq_open, |
7548 | .read = seq_read, | |
7549 | .llseek = seq_lseek, | |
c3f94b40 | 7550 | .release = seq_release_private, |
d7603b7e | 7551 | .poll = mdstat_poll, |
1da177e4 LT |
7552 | }; |
7553 | ||
84fc4b56 | 7554 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7555 | { |
50bd3774 CY |
7556 | printk(KERN_INFO "md: %s personality registered for level %d\n", |
7557 | p->name, p->level); | |
1da177e4 | 7558 | spin_lock(&pers_lock); |
2604b703 | 7559 | list_add_tail(&p->list, &pers_list); |
1da177e4 LT |
7560 | spin_unlock(&pers_lock); |
7561 | return 0; | |
7562 | } | |
6c144d31 | 7563 | EXPORT_SYMBOL(register_md_personality); |
1da177e4 | 7564 | |
84fc4b56 | 7565 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7566 | { |
2604b703 | 7567 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7568 | spin_lock(&pers_lock); |
2604b703 | 7569 | list_del_init(&p->list); |
1da177e4 LT |
7570 | spin_unlock(&pers_lock); |
7571 | return 0; | |
7572 | } | |
6c144d31 | 7573 | EXPORT_SYMBOL(unregister_md_personality); |
1da177e4 | 7574 | |
6022e75b N |
7575 | int register_md_cluster_operations(struct md_cluster_operations *ops, |
7576 | struct module *module) | |
edb39c9d | 7577 | { |
6022e75b | 7578 | int ret = 0; |
edb39c9d | 7579 | spin_lock(&pers_lock); |
6022e75b N |
7580 | if (md_cluster_ops != NULL) |
7581 | ret = -EALREADY; | |
7582 | else { | |
7583 | md_cluster_ops = ops; | |
7584 | md_cluster_mod = module; | |
7585 | } | |
edb39c9d | 7586 | spin_unlock(&pers_lock); |
6022e75b | 7587 | return ret; |
edb39c9d GR |
7588 | } |
7589 | EXPORT_SYMBOL(register_md_cluster_operations); | |
7590 | ||
7591 | int unregister_md_cluster_operations(void) | |
7592 | { | |
7593 | spin_lock(&pers_lock); | |
7594 | md_cluster_ops = NULL; | |
7595 | spin_unlock(&pers_lock); | |
7596 | return 0; | |
7597 | } | |
7598 | EXPORT_SYMBOL(unregister_md_cluster_operations); | |
7599 | ||
7600 | int md_setup_cluster(struct mddev *mddev, int nodes) | |
7601 | { | |
7602 | int err; | |
7603 | ||
7604 | err = request_module("md-cluster"); | |
7605 | if (err) { | |
7606 | pr_err("md-cluster module not found.\n"); | |
b0c26a79 | 7607 | return -ENOENT; |
edb39c9d GR |
7608 | } |
7609 | ||
7610 | spin_lock(&pers_lock); | |
7611 | if (!md_cluster_ops || !try_module_get(md_cluster_mod)) { | |
7612 | spin_unlock(&pers_lock); | |
7613 | return -ENOENT; | |
7614 | } | |
7615 | spin_unlock(&pers_lock); | |
7616 | ||
cf921cc1 | 7617 | return md_cluster_ops->join(mddev, nodes); |
edb39c9d GR |
7618 | } |
7619 | ||
7620 | void md_cluster_stop(struct mddev *mddev) | |
7621 | { | |
c4ce867f GR |
7622 | if (!md_cluster_ops) |
7623 | return; | |
edb39c9d GR |
7624 | md_cluster_ops->leave(mddev); |
7625 | module_put(md_cluster_mod); | |
7626 | } | |
7627 | ||
fd01b88c | 7628 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7629 | { |
f72ffdd6 | 7630 | struct md_rdev *rdev; |
1da177e4 | 7631 | int idle; |
eea1bf38 | 7632 | int curr_events; |
1da177e4 LT |
7633 | |
7634 | idle = 1; | |
4b80991c N |
7635 | rcu_read_lock(); |
7636 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7637 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7638 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7639 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7640 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7641 | /* sync IO will cause sync_io to increase before the disk_stats |
7642 | * as sync_io is counted when a request starts, and | |
7643 | * disk_stats is counted when it completes. | |
7644 | * So resync activity will cause curr_events to be smaller than | |
7645 | * when there was no such activity. | |
7646 | * non-sync IO will cause disk_stat to increase without | |
7647 | * increasing sync_io so curr_events will (eventually) | |
7648 | * be larger than it was before. Once it becomes | |
7649 | * substantially larger, the test below will cause | |
7650 | * the array to appear non-idle, and resync will slow | |
7651 | * down. | |
7652 | * If there is a lot of outstanding resync activity when | |
7653 | * we set last_event to curr_events, then all that activity | |
7654 | * completing might cause the array to appear non-idle | |
7655 | * and resync will be slowed down even though there might | |
7656 | * not have been non-resync activity. This will only | |
7657 | * happen once though. 'last_events' will soon reflect | |
7658 | * the state where there is little or no outstanding | |
7659 | * resync requests, and further resync activity will | |
7660 | * always make curr_events less than last_events. | |
c0e48521 | 7661 | * |
1da177e4 | 7662 | */ |
eea1bf38 | 7663 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7664 | rdev->last_events = curr_events; |
7665 | idle = 0; | |
7666 | } | |
7667 | } | |
4b80991c | 7668 | rcu_read_unlock(); |
1da177e4 LT |
7669 | return idle; |
7670 | } | |
7671 | ||
fd01b88c | 7672 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7673 | { |
7674 | /* another "blocks" (512byte) blocks have been synced */ | |
7675 | atomic_sub(blocks, &mddev->recovery_active); | |
7676 | wake_up(&mddev->recovery_wait); | |
7677 | if (!ok) { | |
dfc70645 | 7678 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7679 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7680 | md_wakeup_thread(mddev->thread); |
7681 | // stop recovery, signal do_sync .... | |
7682 | } | |
7683 | } | |
6c144d31 | 7684 | EXPORT_SYMBOL(md_done_sync); |
1da177e4 | 7685 | |
06d91a5f N |
7686 | /* md_write_start(mddev, bi) |
7687 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7688 | * in superblock) before writing, schedule a superblock update |
7689 | * and wait for it to complete. | |
06d91a5f | 7690 | */ |
fd01b88c | 7691 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7692 | { |
0fd62b86 | 7693 | int did_change = 0; |
06d91a5f | 7694 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7695 | return; |
06d91a5f | 7696 | |
f91de92e N |
7697 | BUG_ON(mddev->ro == 1); |
7698 | if (mddev->ro == 2) { | |
7699 | /* need to switch to read/write */ | |
7700 | mddev->ro = 0; | |
7701 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7702 | md_wakeup_thread(mddev->thread); | |
25156198 | 7703 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7704 | did_change = 1; |
f91de92e | 7705 | } |
06d91a5f | 7706 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7707 | if (mddev->safemode == 1) |
7708 | mddev->safemode = 0; | |
06d91a5f | 7709 | if (mddev->in_sync) { |
85572d7c | 7710 | spin_lock(&mddev->lock); |
3d310eb7 N |
7711 | if (mddev->in_sync) { |
7712 | mddev->in_sync = 0; | |
850b2b42 | 7713 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7714 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7715 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7716 | did_change = 1; |
3d310eb7 | 7717 | } |
85572d7c | 7718 | spin_unlock(&mddev->lock); |
06d91a5f | 7719 | } |
0fd62b86 | 7720 | if (did_change) |
00bcb4ac | 7721 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7722 | wait_event(mddev->sb_wait, |
09a44cc1 | 7723 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 | 7724 | } |
6c144d31 | 7725 | EXPORT_SYMBOL(md_write_start); |
1da177e4 | 7726 | |
fd01b88c | 7727 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7728 | { |
7729 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7730 | if (mddev->safemode == 2) | |
7731 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7732 | else if (mddev->safemode_delay) |
1da177e4 LT |
7733 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7734 | } | |
7735 | } | |
6c144d31 | 7736 | EXPORT_SYMBOL(md_write_end); |
1da177e4 | 7737 | |
2a2275d6 N |
7738 | /* md_allow_write(mddev) |
7739 | * Calling this ensures that the array is marked 'active' so that writes | |
7740 | * may proceed without blocking. It is important to call this before | |
7741 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7742 | * Must be called with mddev_lock held. | |
b5470dc5 | 7743 | * |
abf3508d | 7744 | * In the ->external case MD_CHANGE_PENDING can not be cleared until mddev->lock |
b5470dc5 | 7745 | * is dropped, so return -EAGAIN after notifying userspace. |
2a2275d6 | 7746 | */ |
fd01b88c | 7747 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7748 | { |
7749 | if (!mddev->pers) | |
b5470dc5 | 7750 | return 0; |
2a2275d6 | 7751 | if (mddev->ro) |
b5470dc5 | 7752 | return 0; |
1a0fd497 | 7753 | if (!mddev->pers->sync_request) |
b5470dc5 | 7754 | return 0; |
2a2275d6 | 7755 | |
85572d7c | 7756 | spin_lock(&mddev->lock); |
2a2275d6 N |
7757 | if (mddev->in_sync) { |
7758 | mddev->in_sync = 0; | |
7759 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7760 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7761 | if (mddev->safemode_delay && |
7762 | mddev->safemode == 0) | |
7763 | mddev->safemode = 1; | |
85572d7c | 7764 | spin_unlock(&mddev->lock); |
2a2275d6 | 7765 | md_update_sb(mddev, 0); |
00bcb4ac | 7766 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 | 7767 | } else |
85572d7c | 7768 | spin_unlock(&mddev->lock); |
b5470dc5 | 7769 | |
070dc6dd | 7770 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7771 | return -EAGAIN; |
7772 | else | |
7773 | return 0; | |
2a2275d6 N |
7774 | } |
7775 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7776 | ||
1da177e4 LT |
7777 | #define SYNC_MARKS 10 |
7778 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7779 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7780 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7781 | { |
4ed8731d | 7782 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7783 | struct mddev *mddev2; |
1da177e4 LT |
7784 | unsigned int currspeed = 0, |
7785 | window; | |
ac7e50a3 | 7786 | sector_t max_sectors,j, io_sectors, recovery_done; |
1da177e4 | 7787 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7788 | unsigned long update_time; |
1da177e4 LT |
7789 | sector_t mark_cnt[SYNC_MARKS]; |
7790 | int last_mark,m; | |
7791 | struct list_head *tmp; | |
7792 | sector_t last_check; | |
57afd89f | 7793 | int skipped = 0; |
3cb03002 | 7794 | struct md_rdev *rdev; |
c4a39551 | 7795 | char *desc, *action = NULL; |
7c2c57c9 | 7796 | struct blk_plug plug; |
41a9a0dc | 7797 | int ret; |
1da177e4 LT |
7798 | |
7799 | /* just incase thread restarts... */ | |
7800 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7801 | return; | |
3991b31e N |
7802 | if (mddev->ro) {/* never try to sync a read-only array */ |
7803 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
5fd6c1dc | 7804 | return; |
3991b31e | 7805 | } |
1da177e4 | 7806 | |
41a9a0dc GJ |
7807 | if (mddev_is_clustered(mddev)) { |
7808 | ret = md_cluster_ops->resync_start(mddev); | |
7809 | if (ret) | |
7810 | goto skip; | |
7811 | ||
7812 | if (!(test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || | |
7813 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) || | |
7814 | test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) | |
7815 | && ((unsigned long long)mddev->curr_resync_completed | |
7816 | < (unsigned long long)mddev->resync_max_sectors)) | |
7817 | goto skip; | |
7818 | } | |
7819 | ||
61df9d91 | 7820 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
c4a39551 | 7821 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) { |
61df9d91 | 7822 | desc = "data-check"; |
c4a39551 JB |
7823 | action = "check"; |
7824 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
61df9d91 | 7825 | desc = "requested-resync"; |
c4a39551 JB |
7826 | action = "repair"; |
7827 | } else | |
61df9d91 N |
7828 | desc = "resync"; |
7829 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7830 | desc = "reshape"; | |
7831 | else | |
7832 | desc = "recovery"; | |
7833 | ||
c4a39551 JB |
7834 | mddev->last_sync_action = action ?: desc; |
7835 | ||
1da177e4 LT |
7836 | /* we overload curr_resync somewhat here. |
7837 | * 0 == not engaged in resync at all | |
7838 | * 2 == checking that there is no conflict with another sync | |
7839 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7840 | * commense | |
7841 | * other == active in resync - this many blocks | |
7842 | * | |
7843 | * Before starting a resync we must have set curr_resync to | |
7844 | * 2, and then checked that every "conflicting" array has curr_resync | |
7845 | * less than ours. When we find one that is the same or higher | |
7846 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7847 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7848 | * This will mean we have to start checking from the beginning again. | |
7849 | * | |
7850 | */ | |
7851 | ||
7852 | do { | |
7853 | mddev->curr_resync = 2; | |
7854 | ||
7855 | try_again: | |
404e4b43 | 7856 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 | 7857 | goto skip; |
29ac4aa3 | 7858 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7859 | if (mddev2 == mddev) |
7860 | continue; | |
90b08710 BS |
7861 | if (!mddev->parallel_resync |
7862 | && mddev2->curr_resync | |
7863 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7864 | DEFINE_WAIT(wq); |
7865 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7866 | /* arbitrarily yield */ | |
7867 | mddev->curr_resync = 1; | |
7868 | wake_up(&resync_wait); | |
7869 | } | |
7870 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7871 | /* no need to wait here, we can wait the next | |
7872 | * time 'round when curr_resync == 2 | |
7873 | */ | |
7874 | continue; | |
9744197c N |
7875 | /* We need to wait 'interruptible' so as not to |
7876 | * contribute to the load average, and not to | |
7877 | * be caught by 'softlockup' | |
7878 | */ | |
7879 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
c91abf5a | 7880 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
8712e553 | 7881 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7882 | printk(KERN_INFO "md: delaying %s of %s" |
7883 | " until %s has finished (they" | |
1da177e4 | 7884 | " share one or more physical units)\n", |
61df9d91 | 7885 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7886 | mddev_put(mddev2); |
9744197c N |
7887 | if (signal_pending(current)) |
7888 | flush_signals(current); | |
1da177e4 LT |
7889 | schedule(); |
7890 | finish_wait(&resync_wait, &wq); | |
7891 | goto try_again; | |
7892 | } | |
7893 | finish_wait(&resync_wait, &wq); | |
7894 | } | |
7895 | } | |
7896 | } while (mddev->curr_resync < 2); | |
7897 | ||
5fd6c1dc | 7898 | j = 0; |
9d88883e | 7899 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7900 | /* resync follows the size requested by the personality, |
57afd89f | 7901 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7902 | */ |
7903 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7904 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7905 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7906 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7907 | j = mddev->resync_min; | |
7908 | else if (!mddev->bitmap) | |
5fd6c1dc | 7909 | j = mddev->recovery_cp; |
5e96ee65 | 7910 | |
ccfcc3c1 | 7911 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7912 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7913 | else { |
1da177e4 | 7914 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7915 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7916 | j = MaxSector; |
4e59ca7d | 7917 | rcu_read_lock(); |
dafb20fa | 7918 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7919 | if (rdev->raid_disk >= 0 && |
f2076e7d | 7920 | !test_bit(Journal, &rdev->flags) && |
5fd6c1dc N |
7921 | !test_bit(Faulty, &rdev->flags) && |
7922 | !test_bit(In_sync, &rdev->flags) && | |
7923 | rdev->recovery_offset < j) | |
7924 | j = rdev->recovery_offset; | |
4e59ca7d | 7925 | rcu_read_unlock(); |
133d4527 N |
7926 | |
7927 | /* If there is a bitmap, we need to make sure all | |
7928 | * writes that started before we added a spare | |
7929 | * complete before we start doing a recovery. | |
7930 | * Otherwise the write might complete and (via | |
7931 | * bitmap_endwrite) set a bit in the bitmap after the | |
7932 | * recovery has checked that bit and skipped that | |
7933 | * region. | |
7934 | */ | |
7935 | if (mddev->bitmap) { | |
7936 | mddev->pers->quiesce(mddev, 1); | |
7937 | mddev->pers->quiesce(mddev, 0); | |
7938 | } | |
5fd6c1dc | 7939 | } |
1da177e4 | 7940 | |
61df9d91 N |
7941 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7942 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7943 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7944 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7945 | "(but not more than %d KB/sec) for %s.\n", |
7946 | speed_max(mddev), desc); | |
1da177e4 | 7947 | |
eea1bf38 | 7948 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7949 | |
57afd89f | 7950 | io_sectors = 0; |
1da177e4 LT |
7951 | for (m = 0; m < SYNC_MARKS; m++) { |
7952 | mark[m] = jiffies; | |
57afd89f | 7953 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7954 | } |
7955 | last_mark = 0; | |
7956 | mddev->resync_mark = mark[last_mark]; | |
7957 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7958 | ||
7959 | /* | |
7960 | * Tune reconstruction: | |
7961 | */ | |
7962 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7963 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7964 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7965 | |
7966 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7967 | last_check = 0; |
7968 | ||
7969 | if (j>2) { | |
c91abf5a | 7970 | printk(KERN_INFO |
61df9d91 N |
7971 | "md: resuming %s of %s from checkpoint.\n", |
7972 | desc, mdname(mddev)); | |
1da177e4 | 7973 | mddev->curr_resync = j; |
72f36d59 N |
7974 | } else |
7975 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7976 | mddev->curr_resync_completed = j; |
72f36d59 N |
7977 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7978 | md_new_event(mddev); | |
54f89341 | 7979 | update_time = jiffies; |
1da177e4 | 7980 | |
7c2c57c9 | 7981 | blk_start_plug(&plug); |
1da177e4 | 7982 | while (j < max_sectors) { |
57afd89f | 7983 | sector_t sectors; |
1da177e4 | 7984 | |
57afd89f | 7985 | skipped = 0; |
97e4f42d | 7986 | |
7a91ee1f N |
7987 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7988 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7989 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7990 | > (max_sectors >> 4)) || | |
54f89341 | 7991 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f | 7992 | (j - mddev->curr_resync_completed)*2 |
c5e19d90 N |
7993 | >= mddev->resync_max - mddev->curr_resync_completed || |
7994 | mddev->curr_resync_completed > mddev->resync_max | |
7a91ee1f | 7995 | )) { |
97e4f42d | 7996 | /* time to update curr_resync_completed */ |
97e4f42d N |
7997 | wait_event(mddev->recovery_wait, |
7998 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7999 | mddev->curr_resync_completed = j; |
35d78c66 | 8000 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
8001 | j > mddev->recovery_cp) | |
8002 | mddev->recovery_cp = j; | |
54f89341 | 8003 | update_time = jiffies; |
070dc6dd | 8004 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 8005 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 8006 | } |
acb180b0 | 8007 | |
c91abf5a N |
8008 | while (j >= mddev->resync_max && |
8009 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
e62e58a5 N |
8010 | /* As this condition is controlled by user-space, |
8011 | * we can block indefinitely, so use '_interruptible' | |
8012 | * to avoid triggering warnings. | |
8013 | */ | |
8014 | flush_signals(current); /* just in case */ | |
8015 | wait_event_interruptible(mddev->recovery_wait, | |
8016 | mddev->resync_max > j | |
c91abf5a N |
8017 | || test_bit(MD_RECOVERY_INTR, |
8018 | &mddev->recovery)); | |
e62e58a5 | 8019 | } |
acb180b0 | 8020 | |
c91abf5a N |
8021 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
8022 | break; | |
acb180b0 | 8023 | |
09314799 | 8024 | sectors = mddev->pers->sync_request(mddev, j, &skipped); |
57afd89f | 8025 | if (sectors == 0) { |
dfc70645 | 8026 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
c91abf5a | 8027 | break; |
1da177e4 | 8028 | } |
57afd89f N |
8029 | |
8030 | if (!skipped) { /* actual IO requested */ | |
8031 | io_sectors += sectors; | |
8032 | atomic_add(sectors, &mddev->recovery_active); | |
8033 | } | |
8034 | ||
e875ecea N |
8035 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
8036 | break; | |
8037 | ||
1da177e4 | 8038 | j += sectors; |
5ed1df2e N |
8039 | if (j > max_sectors) |
8040 | /* when skipping, extra large numbers can be returned. */ | |
8041 | j = max_sectors; | |
72f36d59 N |
8042 | if (j > 2) |
8043 | mddev->curr_resync = j; | |
ff4e8d9a | 8044 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 8045 | if (last_check == 0) |
e875ecea | 8046 | /* this is the earliest that rebuild will be |
d7603b7e N |
8047 | * visible in /proc/mdstat |
8048 | */ | |
8049 | md_new_event(mddev); | |
57afd89f N |
8050 | |
8051 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
8052 | continue; |
8053 | ||
57afd89f | 8054 | last_check = io_sectors; |
1da177e4 LT |
8055 | repeat: |
8056 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
8057 | /* step marks */ | |
8058 | int next = (last_mark+1) % SYNC_MARKS; | |
8059 | ||
8060 | mddev->resync_mark = mark[next]; | |
8061 | mddev->resync_mark_cnt = mark_cnt[next]; | |
8062 | mark[next] = jiffies; | |
57afd89f | 8063 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
8064 | last_mark = next; |
8065 | } | |
8066 | ||
c91abf5a N |
8067 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
8068 | break; | |
1da177e4 LT |
8069 | |
8070 | /* | |
8071 | * this loop exits only if either when we are slower than | |
8072 | * the 'hard' speed limit, or the system was IO-idle for | |
8073 | * a jiffy. | |
8074 | * the system might be non-idle CPU-wise, but we only care | |
8075 | * about not overloading the IO subsystem. (things like an | |
8076 | * e2fsck being done on the RAID array should execute fast) | |
8077 | */ | |
1da177e4 LT |
8078 | cond_resched(); |
8079 | ||
ac7e50a3 XN |
8080 | recovery_done = io_sectors - atomic_read(&mddev->recovery_active); |
8081 | currspeed = ((unsigned long)(recovery_done - mddev->resync_mark_cnt))/2 | |
57afd89f | 8082 | /((jiffies-mddev->resync_mark)/HZ +1) +1; |
1da177e4 | 8083 | |
88202a0c | 8084 | if (currspeed > speed_min(mddev)) { |
ac8fa419 | 8085 | if (currspeed > speed_max(mddev)) { |
c0e48521 | 8086 | msleep(500); |
1da177e4 LT |
8087 | goto repeat; |
8088 | } | |
ac8fa419 N |
8089 | if (!is_mddev_idle(mddev, 0)) { |
8090 | /* | |
8091 | * Give other IO more of a chance. | |
8092 | * The faster the devices, the less we wait. | |
8093 | */ | |
8094 | wait_event(mddev->recovery_wait, | |
8095 | !atomic_read(&mddev->recovery_active)); | |
8096 | } | |
1da177e4 LT |
8097 | } |
8098 | } | |
c91abf5a N |
8099 | printk(KERN_INFO "md: %s: %s %s.\n",mdname(mddev), desc, |
8100 | test_bit(MD_RECOVERY_INTR, &mddev->recovery) | |
8101 | ? "interrupted" : "done"); | |
1da177e4 LT |
8102 | /* |
8103 | * this also signals 'finished resyncing' to md_stop | |
8104 | */ | |
7c2c57c9 | 8105 | blk_finish_plug(&plug); |
1da177e4 LT |
8106 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
8107 | ||
5ed1df2e N |
8108 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
8109 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8110 | mddev->curr_resync > 2) { | |
8111 | mddev->curr_resync_completed = mddev->curr_resync; | |
8112 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
8113 | } | |
09314799 | 8114 | mddev->pers->sync_request(mddev, max_sectors, &skipped); |
1da177e4 | 8115 | |
dfc70645 | 8116 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
8117 | mddev->curr_resync > 2) { |
8118 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
8119 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
8120 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
8121 | printk(KERN_INFO | |
61df9d91 N |
8122 | "md: checkpointing %s of %s.\n", |
8123 | desc, mdname(mddev)); | |
0a19caab | 8124 | if (test_bit(MD_RECOVERY_ERROR, |
8125 | &mddev->recovery)) | |
8126 | mddev->recovery_cp = | |
8127 | mddev->curr_resync_completed; | |
8128 | else | |
8129 | mddev->recovery_cp = | |
8130 | mddev->curr_resync; | |
5fd6c1dc N |
8131 | } |
8132 | } else | |
8133 | mddev->recovery_cp = MaxSector; | |
8134 | } else { | |
8135 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
8136 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 8137 | rcu_read_lock(); |
dafb20fa | 8138 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 8139 | if (rdev->raid_disk >= 0 && |
70fffd0b | 8140 | mddev->delta_disks >= 0 && |
f2076e7d | 8141 | !test_bit(Journal, &rdev->flags) && |
5fd6c1dc N |
8142 | !test_bit(Faulty, &rdev->flags) && |
8143 | !test_bit(In_sync, &rdev->flags) && | |
8144 | rdev->recovery_offset < mddev->curr_resync) | |
8145 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 8146 | rcu_read_unlock(); |
5fd6c1dc | 8147 | } |
1da177e4 | 8148 | } |
db91ff55 | 8149 | skip: |
17571284 | 8150 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 8151 | |
c186b128 | 8152 | if (mddev_is_clustered(mddev) && |
2c97cf13 GJ |
8153 | ret == 0) { |
8154 | /* set CHANGE_PENDING here since maybe another | |
8155 | * update is needed, so other nodes are informed */ | |
8156 | set_bit(MD_CHANGE_PENDING, &mddev->flags); | |
8157 | md_wakeup_thread(mddev->thread); | |
8158 | wait_event(mddev->sb_wait, | |
8159 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
c186b128 | 8160 | md_cluster_ops->resync_finish(mddev); |
2c97cf13 | 8161 | } |
c186b128 | 8162 | |
23da422b | 8163 | spin_lock(&mddev->lock); |
c07b70ad N |
8164 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
8165 | /* We completed so min/max setting can be forgotten if used. */ | |
8166 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
8167 | mddev->resync_min = 0; | |
8168 | mddev->resync_max = MaxSector; | |
8169 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
8170 | mddev->resync_min = mddev->curr_resync_completed; | |
f7851be7 | 8171 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); |
1da177e4 | 8172 | mddev->curr_resync = 0; |
23da422b N |
8173 | spin_unlock(&mddev->lock); |
8174 | ||
1da177e4 | 8175 | wake_up(&resync_wait); |
1da177e4 | 8176 | md_wakeup_thread(mddev->thread); |
c6207277 | 8177 | return; |
1da177e4 | 8178 | } |
29269553 | 8179 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 8180 | |
746d3207 N |
8181 | static int remove_and_add_spares(struct mddev *mddev, |
8182 | struct md_rdev *this) | |
b4c4c7b8 | 8183 | { |
3cb03002 | 8184 | struct md_rdev *rdev; |
b4c4c7b8 | 8185 | int spares = 0; |
f2a371c5 | 8186 | int removed = 0; |
b4c4c7b8 | 8187 | |
dafb20fa | 8188 | rdev_for_each(rdev, mddev) |
746d3207 N |
8189 | if ((this == NULL || rdev == this) && |
8190 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 8191 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 | 8192 | (test_bit(Faulty, &rdev->flags) || |
f2076e7d SL |
8193 | (!test_bit(In_sync, &rdev->flags) && |
8194 | !test_bit(Journal, &rdev->flags))) && | |
b4c4c7b8 N |
8195 | atomic_read(&rdev->nr_pending)==0) { |
8196 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 8197 | mddev, rdev) == 0) { |
36fad858 | 8198 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 8199 | rdev->raid_disk = -1; |
f2a371c5 | 8200 | removed++; |
b4c4c7b8 N |
8201 | } |
8202 | } | |
90584fc9 JB |
8203 | if (removed && mddev->kobj.sd) |
8204 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 8205 | |
2910ff17 | 8206 | if (this && removed) |
746d3207 N |
8207 | goto no_add; |
8208 | ||
dafb20fa | 8209 | rdev_for_each(rdev, mddev) { |
2910ff17 GR |
8210 | if (this && this != rdev) |
8211 | continue; | |
dbb64f86 GR |
8212 | if (test_bit(Candidate, &rdev->flags)) |
8213 | continue; | |
7bfec5f3 N |
8214 | if (rdev->raid_disk >= 0 && |
8215 | !test_bit(In_sync, &rdev->flags) && | |
f2076e7d | 8216 | !test_bit(Journal, &rdev->flags) && |
7bfec5f3 N |
8217 | !test_bit(Faulty, &rdev->flags)) |
8218 | spares++; | |
7ceb17e8 N |
8219 | if (rdev->raid_disk >= 0) |
8220 | continue; | |
8221 | if (test_bit(Faulty, &rdev->flags)) | |
8222 | continue; | |
f6b6ec5c SL |
8223 | if (!test_bit(Journal, &rdev->flags)) { |
8224 | if (mddev->ro && | |
8225 | ! (rdev->saved_raid_disk >= 0 && | |
8226 | !test_bit(Bitmap_sync, &rdev->flags))) | |
8227 | continue; | |
7ceb17e8 | 8228 | |
f6b6ec5c SL |
8229 | rdev->recovery_offset = 0; |
8230 | } | |
7ceb17e8 N |
8231 | if (mddev->pers-> |
8232 | hot_add_disk(mddev, rdev) == 0) { | |
8233 | if (sysfs_link_rdev(mddev, rdev)) | |
8234 | /* failure here is OK */; | |
f6b6ec5c SL |
8235 | if (!test_bit(Journal, &rdev->flags)) |
8236 | spares++; | |
7ceb17e8 N |
8237 | md_new_event(mddev); |
8238 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 8239 | } |
b4c4c7b8 | 8240 | } |
746d3207 | 8241 | no_add: |
6dafab6b N |
8242 | if (removed) |
8243 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
8244 | return spares; |
8245 | } | |
7ebc0be7 | 8246 | |
ac05f256 N |
8247 | static void md_start_sync(struct work_struct *ws) |
8248 | { | |
8249 | struct mddev *mddev = container_of(ws, struct mddev, del_work); | |
c186b128 GR |
8250 | int ret = 0; |
8251 | ||
ac05f256 N |
8252 | mddev->sync_thread = md_register_thread(md_do_sync, |
8253 | mddev, | |
8254 | "resync"); | |
8255 | if (!mddev->sync_thread) { | |
c186b128 GR |
8256 | if (!(mddev_is_clustered(mddev) && ret == -EAGAIN)) |
8257 | printk(KERN_ERR "%s: could not start resync" | |
8258 | " thread...\n", | |
8259 | mdname(mddev)); | |
ac05f256 N |
8260 | /* leave the spares where they are, it shouldn't hurt */ |
8261 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
8262 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8263 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8264 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
8265 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8266 | wake_up(&resync_wait); |
ac05f256 N |
8267 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8268 | &mddev->recovery)) | |
8269 | if (mddev->sysfs_action) | |
8270 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8271 | } else | |
8272 | md_wakeup_thread(mddev->sync_thread); | |
8273 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8274 | md_new_event(mddev); | |
8275 | } | |
8276 | ||
1da177e4 LT |
8277 | /* |
8278 | * This routine is regularly called by all per-raid-array threads to | |
8279 | * deal with generic issues like resync and super-block update. | |
8280 | * Raid personalities that don't have a thread (linear/raid0) do not | |
8281 | * need this as they never do any recovery or update the superblock. | |
8282 | * | |
8283 | * It does not do any resync itself, but rather "forks" off other threads | |
8284 | * to do that as needed. | |
8285 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
8286 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 8287 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
8288 | * and wakeups up this thread which will reap the thread and finish up. |
8289 | * This thread also removes any faulty devices (with nr_pending == 0). | |
8290 | * | |
8291 | * The overall approach is: | |
8292 | * 1/ if the superblock needs updating, update it. | |
8293 | * 2/ If a recovery thread is running, don't do anything else. | |
8294 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
8295 | * 4/ If there are any faulty devices, remove them. | |
8296 | * 5/ If array is degraded, try to add spares devices | |
8297 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
8298 | */ | |
fd01b88c | 8299 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 8300 | { |
68866e42 JB |
8301 | if (mddev->suspended) |
8302 | return; | |
8303 | ||
5f40402d | 8304 | if (mddev->bitmap) |
aa5cbd10 | 8305 | bitmap_daemon_work(mddev); |
1da177e4 | 8306 | |
fca4d848 | 8307 | if (signal_pending(current)) { |
31a59e34 | 8308 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
8309 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
8310 | mdname(mddev)); | |
8311 | mddev->safemode = 2; | |
8312 | } | |
8313 | flush_signals(current); | |
8314 | } | |
8315 | ||
c89a8eee N |
8316 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
8317 | return; | |
1da177e4 | 8318 | if ( ! ( |
142d44c3 | 8319 | (mddev->flags & MD_UPDATE_SB_FLAGS & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 8320 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 8321 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
15858fa5 | 8322 | test_bit(MD_RELOAD_SB, &mddev->flags) || |
31a59e34 | 8323 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
8324 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
8325 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
8326 | )) |
8327 | return; | |
fca4d848 | 8328 | |
df5b89b3 | 8329 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 8330 | int spares = 0; |
fca4d848 | 8331 | |
c89a8eee | 8332 | if (mddev->ro) { |
ab16bfc7 NB |
8333 | struct md_rdev *rdev; |
8334 | if (!mddev->external && mddev->in_sync) | |
8335 | /* 'Blocked' flag not needed as failed devices | |
8336 | * will be recorded if array switched to read/write. | |
8337 | * Leaving it set will prevent the device | |
8338 | * from being removed. | |
8339 | */ | |
8340 | rdev_for_each(rdev, mddev) | |
8341 | clear_bit(Blocked, &rdev->flags); | |
7ceb17e8 N |
8342 | /* On a read-only array we can: |
8343 | * - remove failed devices | |
8344 | * - add already-in_sync devices if the array itself | |
8345 | * is in-sync. | |
8346 | * As we only add devices that are already in-sync, | |
8347 | * we can activate the spares immediately. | |
c89a8eee | 8348 | */ |
7ceb17e8 | 8349 | remove_and_add_spares(mddev, NULL); |
8313b8e5 N |
8350 | /* There is no thread, but we need to call |
8351 | * ->spare_active and clear saved_raid_disk | |
8352 | */ | |
2ac295a5 | 8353 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8313b8e5 | 8354 | md_reap_sync_thread(mddev); |
a4a3d26d | 8355 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
8313b8e5 | 8356 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
d4929add | 8357 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
c89a8eee N |
8358 | goto unlock; |
8359 | } | |
8360 | ||
659b254f GJ |
8361 | if (mddev_is_clustered(mddev)) { |
8362 | struct md_rdev *rdev; | |
8363 | /* kick the device if another node issued a | |
8364 | * remove disk. | |
8365 | */ | |
8366 | rdev_for_each(rdev, mddev) { | |
8367 | if (test_and_clear_bit(ClusterRemove, &rdev->flags) && | |
8368 | rdev->raid_disk < 0) | |
8369 | md_kick_rdev_from_array(rdev); | |
8370 | } | |
15858fa5 GJ |
8371 | |
8372 | if (test_and_clear_bit(MD_RELOAD_SB, &mddev->flags)) | |
8373 | md_reload_sb(mddev, mddev->good_device_nr); | |
659b254f GJ |
8374 | } |
8375 | ||
31a59e34 | 8376 | if (!mddev->external) { |
0fd62b86 | 8377 | int did_change = 0; |
85572d7c | 8378 | spin_lock(&mddev->lock); |
31a59e34 N |
8379 | if (mddev->safemode && |
8380 | !atomic_read(&mddev->writes_pending) && | |
8381 | !mddev->in_sync && | |
8382 | mddev->recovery_cp == MaxSector) { | |
8383 | mddev->in_sync = 1; | |
0fd62b86 | 8384 | did_change = 1; |
070dc6dd | 8385 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
8386 | } |
8387 | if (mddev->safemode == 1) | |
8388 | mddev->safemode = 0; | |
85572d7c | 8389 | spin_unlock(&mddev->lock); |
0fd62b86 | 8390 | if (did_change) |
00bcb4ac | 8391 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 8392 | } |
fca4d848 | 8393 | |
2aa82191 | 8394 | if (mddev->flags & MD_UPDATE_SB_FLAGS) |
850b2b42 | 8395 | md_update_sb(mddev, 0); |
06d91a5f | 8396 | |
1da177e4 LT |
8397 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
8398 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
8399 | /* resync/recovery still happening */ | |
8400 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8401 | goto unlock; | |
8402 | } | |
8403 | if (mddev->sync_thread) { | |
a91d5ac0 | 8404 | md_reap_sync_thread(mddev); |
1da177e4 LT |
8405 | goto unlock; |
8406 | } | |
72a23c21 NB |
8407 | /* Set RUNNING before clearing NEEDED to avoid |
8408 | * any transients in the value of "sync_action". | |
8409 | */ | |
72f36d59 | 8410 | mddev->curr_resync_completed = 0; |
23da422b | 8411 | spin_lock(&mddev->lock); |
72a23c21 | 8412 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
23da422b | 8413 | spin_unlock(&mddev->lock); |
24dd469d N |
8414 | /* Clear some bits that don't mean anything, but |
8415 | * might be left set | |
8416 | */ | |
24dd469d N |
8417 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
8418 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 8419 | |
ed209584 N |
8420 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
8421 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
ac05f256 | 8422 | goto not_running; |
1da177e4 LT |
8423 | /* no recovery is running. |
8424 | * remove any failed drives, then | |
8425 | * add spares if possible. | |
72f36d59 | 8426 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
8427 | * the personality to fail the re-add. |
8428 | */ | |
1da177e4 | 8429 | |
b4c4c7b8 | 8430 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
8431 | if (mddev->pers->check_reshape == NULL || |
8432 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 | 8433 | /* Cannot proceed */ |
ac05f256 | 8434 | goto not_running; |
b4c4c7b8 | 8435 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); |
72a23c21 | 8436 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 8437 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
8438 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8439 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 8440 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 8441 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8442 | } else if (mddev->recovery_cp < MaxSector) { |
8443 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 8444 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
8445 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
8446 | /* nothing to be done ... */ | |
ac05f256 | 8447 | goto not_running; |
24dd469d | 8448 | |
1da177e4 | 8449 | if (mddev->pers->sync_request) { |
ef99bf48 | 8450 | if (spares) { |
a654b9d8 N |
8451 | /* We are adding a device or devices to an array |
8452 | * which has the bitmap stored on all devices. | |
8453 | * So make sure all bitmap pages get written | |
8454 | */ | |
8455 | bitmap_write_all(mddev->bitmap); | |
8456 | } | |
ac05f256 N |
8457 | INIT_WORK(&mddev->del_work, md_start_sync); |
8458 | queue_work(md_misc_wq, &mddev->del_work); | |
8459 | goto unlock; | |
1da177e4 | 8460 | } |
ac05f256 | 8461 | not_running: |
72a23c21 NB |
8462 | if (!mddev->sync_thread) { |
8463 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
f851b60d | 8464 | wake_up(&resync_wait); |
72a23c21 NB |
8465 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, |
8466 | &mddev->recovery)) | |
0c3573f1 | 8467 | if (mddev->sysfs_action) |
00bcb4ac | 8468 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 8469 | } |
ac05f256 N |
8470 | unlock: |
8471 | wake_up(&mddev->sb_wait); | |
1da177e4 LT |
8472 | mddev_unlock(mddev); |
8473 | } | |
8474 | } | |
6c144d31 | 8475 | EXPORT_SYMBOL(md_check_recovery); |
1da177e4 | 8476 | |
a91d5ac0 JB |
8477 | void md_reap_sync_thread(struct mddev *mddev) |
8478 | { | |
8479 | struct md_rdev *rdev; | |
8480 | ||
8481 | /* resync has finished, collect result */ | |
8482 | md_unregister_thread(&mddev->sync_thread); | |
8483 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
8484 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
8485 | /* success...*/ | |
8486 | /* activate any spares */ | |
8487 | if (mddev->pers->spare_active(mddev)) { | |
8488 | sysfs_notify(&mddev->kobj, NULL, | |
8489 | "degraded"); | |
8490 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
8491 | } | |
8492 | } | |
8493 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
8494 | mddev->pers->finish_reshape) | |
8495 | mddev->pers->finish_reshape(mddev); | |
8496 | ||
8497 | /* If array is no-longer degraded, then any saved_raid_disk | |
f466722c | 8498 | * information must be scrapped. |
a91d5ac0 | 8499 | */ |
f466722c N |
8500 | if (!mddev->degraded) |
8501 | rdev_for_each(rdev, mddev) | |
a91d5ac0 JB |
8502 | rdev->saved_raid_disk = -1; |
8503 | ||
8504 | md_update_sb(mddev, 1); | |
8505 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
ea358cd0 | 8506 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); |
a91d5ac0 JB |
8507 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
8508 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
8509 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
8510 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
f851b60d | 8511 | wake_up(&resync_wait); |
a91d5ac0 JB |
8512 | /* flag recovery needed just to double check */ |
8513 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8514 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
8515 | md_new_event(mddev); | |
8516 | if (mddev->event_work.func) | |
8517 | queue_work(md_misc_wq, &mddev->event_work); | |
8518 | } | |
6c144d31 | 8519 | EXPORT_SYMBOL(md_reap_sync_thread); |
a91d5ac0 | 8520 | |
fd01b88c | 8521 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 8522 | { |
00bcb4ac | 8523 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 8524 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
8525 | !test_bit(Blocked, &rdev->flags) && |
8526 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
8527 | msecs_to_jiffies(5000)); |
8528 | rdev_dec_pending(rdev, mddev); | |
8529 | } | |
8530 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
8531 | ||
c6563a8c N |
8532 | void md_finish_reshape(struct mddev *mddev) |
8533 | { | |
8534 | /* called be personality module when reshape completes. */ | |
8535 | struct md_rdev *rdev; | |
8536 | ||
8537 | rdev_for_each(rdev, mddev) { | |
8538 | if (rdev->data_offset > rdev->new_data_offset) | |
8539 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
8540 | else | |
8541 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
8542 | rdev->data_offset = rdev->new_data_offset; | |
8543 | } | |
8544 | } | |
8545 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 | 8546 | |
fc974ee2 | 8547 | /* Bad block management */ |
2230dfe4 | 8548 | |
fc974ee2 | 8549 | /* Returns 1 on success, 0 on failure */ |
3cb03002 | 8550 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8551 | int is_new) |
2230dfe4 | 8552 | { |
c6563a8c N |
8553 | int rv; |
8554 | if (is_new) | |
8555 | s += rdev->new_data_offset; | |
8556 | else | |
8557 | s += rdev->data_offset; | |
fc974ee2 VV |
8558 | rv = badblocks_set(&rdev->badblocks, s, sectors, 0); |
8559 | if (rv == 0) { | |
2230dfe4 | 8560 | /* Make sure they get written out promptly */ |
8bd2f0a0 | 8561 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 | 8562 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
55ce74d4 | 8563 | set_bit(MD_CHANGE_PENDING, &rdev->mddev->flags); |
2230dfe4 | 8564 | md_wakeup_thread(rdev->mddev->thread); |
fc974ee2 VV |
8565 | return 1; |
8566 | } else | |
8567 | return 0; | |
2230dfe4 N |
8568 | } |
8569 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8570 | ||
c6563a8c N |
8571 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8572 | int is_new) | |
2230dfe4 | 8573 | { |
c6563a8c N |
8574 | if (is_new) |
8575 | s += rdev->new_data_offset; | |
8576 | else | |
8577 | s += rdev->data_offset; | |
fc974ee2 | 8578 | return badblocks_clear(&rdev->badblocks, |
c6563a8c | 8579 | s, sectors); |
2230dfe4 N |
8580 | } |
8581 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8582 | ||
75c96f85 AB |
8583 | static int md_notify_reboot(struct notifier_block *this, |
8584 | unsigned long code, void *x) | |
1da177e4 LT |
8585 | { |
8586 | struct list_head *tmp; | |
fd01b88c | 8587 | struct mddev *mddev; |
2dba6a91 | 8588 | int need_delay = 0; |
1da177e4 | 8589 | |
c744a65c N |
8590 | for_each_mddev(mddev, tmp) { |
8591 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8592 | if (mddev->pers) |
8593 | __md_stop_writes(mddev); | |
0f62fb22 N |
8594 | if (mddev->persistent) |
8595 | mddev->safemode = 2; | |
c744a65c | 8596 | mddev_unlock(mddev); |
2dba6a91 | 8597 | } |
c744a65c | 8598 | need_delay = 1; |
1da177e4 | 8599 | } |
c744a65c N |
8600 | /* |
8601 | * certain more exotic SCSI devices are known to be | |
8602 | * volatile wrt too early system reboots. While the | |
8603 | * right place to handle this issue is the given | |
8604 | * driver, we do want to have a safe RAID driver ... | |
8605 | */ | |
8606 | if (need_delay) | |
8607 | mdelay(1000*1); | |
8608 | ||
1da177e4 LT |
8609 | return NOTIFY_DONE; |
8610 | } | |
8611 | ||
75c96f85 | 8612 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8613 | .notifier_call = md_notify_reboot, |
8614 | .next = NULL, | |
8615 | .priority = INT_MAX, /* before any real devices */ | |
8616 | }; | |
8617 | ||
8618 | static void md_geninit(void) | |
8619 | { | |
36a4e1fe | 8620 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8621 | |
c7705f34 | 8622 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8623 | } |
8624 | ||
75c96f85 | 8625 | static int __init md_init(void) |
1da177e4 | 8626 | { |
e804ac78 TH |
8627 | int ret = -ENOMEM; |
8628 | ||
ada609ee | 8629 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8630 | if (!md_wq) |
8631 | goto err_wq; | |
8632 | ||
8633 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8634 | if (!md_misc_wq) | |
8635 | goto err_misc_wq; | |
8636 | ||
8637 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8638 | goto err_md; | |
8639 | ||
8640 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8641 | goto err_mdp; | |
8642 | mdp_major = ret; | |
8643 | ||
af5628f0 | 8644 | blk_register_region(MKDEV(MD_MAJOR, 0), 512, THIS_MODULE, |
e8703fe1 N |
8645 | md_probe, NULL, NULL); |
8646 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8647 | md_probe, NULL, NULL); |
8648 | ||
1da177e4 | 8649 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8650 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8651 | |
8652 | md_geninit(); | |
d710e138 | 8653 | return 0; |
1da177e4 | 8654 | |
e804ac78 TH |
8655 | err_mdp: |
8656 | unregister_blkdev(MD_MAJOR, "md"); | |
8657 | err_md: | |
8658 | destroy_workqueue(md_misc_wq); | |
8659 | err_misc_wq: | |
8660 | destroy_workqueue(md_wq); | |
8661 | err_wq: | |
8662 | return ret; | |
8663 | } | |
1da177e4 | 8664 | |
70bcecdb | 8665 | static void check_sb_changes(struct mddev *mddev, struct md_rdev *rdev) |
1d7e3e96 | 8666 | { |
70bcecdb GR |
8667 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
8668 | struct md_rdev *rdev2; | |
8669 | int role, ret; | |
8670 | char b[BDEVNAME_SIZE]; | |
1d7e3e96 | 8671 | |
70bcecdb GR |
8672 | /* Check for change of roles in the active devices */ |
8673 | rdev_for_each(rdev2, mddev) { | |
8674 | if (test_bit(Faulty, &rdev2->flags)) | |
8675 | continue; | |
8676 | ||
8677 | /* Check if the roles changed */ | |
8678 | role = le16_to_cpu(sb->dev_roles[rdev2->desc_nr]); | |
dbb64f86 GR |
8679 | |
8680 | if (test_bit(Candidate, &rdev2->flags)) { | |
8681 | if (role == 0xfffe) { | |
8682 | pr_info("md: Removing Candidate device %s because add failed\n", bdevname(rdev2->bdev,b)); | |
8683 | md_kick_rdev_from_array(rdev2); | |
8684 | continue; | |
8685 | } | |
8686 | else | |
8687 | clear_bit(Candidate, &rdev2->flags); | |
8688 | } | |
8689 | ||
70bcecdb GR |
8690 | if (role != rdev2->raid_disk) { |
8691 | /* got activated */ | |
8692 | if (rdev2->raid_disk == -1 && role != 0xffff) { | |
8693 | rdev2->saved_raid_disk = role; | |
8694 | ret = remove_and_add_spares(mddev, rdev2); | |
8695 | pr_info("Activated spare: %s\n", | |
8696 | bdevname(rdev2->bdev,b)); | |
a578183e GJ |
8697 | /* wakeup mddev->thread here, so array could |
8698 | * perform resync with the new activated disk */ | |
8699 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
8700 | md_wakeup_thread(mddev->thread); | |
8701 | ||
70bcecdb GR |
8702 | } |
8703 | /* device faulty | |
8704 | * We just want to do the minimum to mark the disk | |
8705 | * as faulty. The recovery is performed by the | |
8706 | * one who initiated the error. | |
8707 | */ | |
8708 | if ((role == 0xfffe) || (role == 0xfffd)) { | |
8709 | md_error(mddev, rdev2); | |
8710 | clear_bit(Blocked, &rdev2->flags); | |
8711 | } | |
8712 | } | |
1d7e3e96 | 8713 | } |
70bcecdb | 8714 | |
28c1b9fd GR |
8715 | if (mddev->raid_disks != le32_to_cpu(sb->raid_disks)) |
8716 | update_raid_disks(mddev, le32_to_cpu(sb->raid_disks)); | |
70bcecdb GR |
8717 | |
8718 | /* Finally set the event to be up to date */ | |
8719 | mddev->events = le64_to_cpu(sb->events); | |
8720 | } | |
8721 | ||
8722 | static int read_rdev(struct mddev *mddev, struct md_rdev *rdev) | |
8723 | { | |
8724 | int err; | |
8725 | struct page *swapout = rdev->sb_page; | |
8726 | struct mdp_superblock_1 *sb; | |
8727 | ||
8728 | /* Store the sb page of the rdev in the swapout temporary | |
8729 | * variable in case we err in the future | |
8730 | */ | |
8731 | rdev->sb_page = NULL; | |
8732 | alloc_disk_sb(rdev); | |
8733 | ClearPageUptodate(rdev->sb_page); | |
8734 | rdev->sb_loaded = 0; | |
8735 | err = super_types[mddev->major_version].load_super(rdev, NULL, mddev->minor_version); | |
8736 | ||
8737 | if (err < 0) { | |
8738 | pr_warn("%s: %d Could not reload rdev(%d) err: %d. Restoring old values\n", | |
8739 | __func__, __LINE__, rdev->desc_nr, err); | |
8740 | put_page(rdev->sb_page); | |
8741 | rdev->sb_page = swapout; | |
8742 | rdev->sb_loaded = 1; | |
8743 | return err; | |
1d7e3e96 GR |
8744 | } |
8745 | ||
70bcecdb GR |
8746 | sb = page_address(rdev->sb_page); |
8747 | /* Read the offset unconditionally, even if MD_FEATURE_RECOVERY_OFFSET | |
8748 | * is not set | |
8749 | */ | |
8750 | ||
8751 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RECOVERY_OFFSET)) | |
8752 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
8753 | ||
8754 | /* The other node finished recovery, call spare_active to set | |
8755 | * device In_sync and mddev->degraded | |
8756 | */ | |
8757 | if (rdev->recovery_offset == MaxSector && | |
8758 | !test_bit(In_sync, &rdev->flags) && | |
8759 | mddev->pers->spare_active(mddev)) | |
8760 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
8761 | ||
8762 | put_page(swapout); | |
8763 | return 0; | |
8764 | } | |
8765 | ||
8766 | void md_reload_sb(struct mddev *mddev, int nr) | |
8767 | { | |
8768 | struct md_rdev *rdev; | |
8769 | int err; | |
8770 | ||
8771 | /* Find the rdev */ | |
8772 | rdev_for_each_rcu(rdev, mddev) { | |
8773 | if (rdev->desc_nr == nr) | |
8774 | break; | |
8775 | } | |
8776 | ||
8777 | if (!rdev || rdev->desc_nr != nr) { | |
8778 | pr_warn("%s: %d Could not find rdev with nr %d\n", __func__, __LINE__, nr); | |
8779 | return; | |
8780 | } | |
8781 | ||
8782 | err = read_rdev(mddev, rdev); | |
8783 | if (err < 0) | |
8784 | return; | |
8785 | ||
8786 | check_sb_changes(mddev, rdev); | |
8787 | ||
8788 | /* Read all rdev's to update recovery_offset */ | |
8789 | rdev_for_each_rcu(rdev, mddev) | |
8790 | read_rdev(mddev, rdev); | |
1d7e3e96 GR |
8791 | } |
8792 | EXPORT_SYMBOL(md_reload_sb); | |
8793 | ||
1da177e4 LT |
8794 | #ifndef MODULE |
8795 | ||
8796 | /* | |
8797 | * Searches all registered partitions for autorun RAID arrays | |
8798 | * at boot time. | |
8799 | */ | |
4d936ec1 ME |
8800 | |
8801 | static LIST_HEAD(all_detected_devices); | |
8802 | struct detected_devices_node { | |
8803 | struct list_head list; | |
8804 | dev_t dev; | |
8805 | }; | |
1da177e4 LT |
8806 | |
8807 | void md_autodetect_dev(dev_t dev) | |
8808 | { | |
4d936ec1 ME |
8809 | struct detected_devices_node *node_detected_dev; |
8810 | ||
8811 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8812 | if (node_detected_dev) { | |
8813 | node_detected_dev->dev = dev; | |
8814 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8815 | } else { | |
8816 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8817 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8818 | } | |
1da177e4 LT |
8819 | } |
8820 | ||
1da177e4 LT |
8821 | static void autostart_arrays(int part) |
8822 | { | |
3cb03002 | 8823 | struct md_rdev *rdev; |
4d936ec1 ME |
8824 | struct detected_devices_node *node_detected_dev; |
8825 | dev_t dev; | |
8826 | int i_scanned, i_passed; | |
1da177e4 | 8827 | |
4d936ec1 ME |
8828 | i_scanned = 0; |
8829 | i_passed = 0; | |
1da177e4 | 8830 | |
4d936ec1 | 8831 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8832 | |
4d936ec1 ME |
8833 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8834 | i_scanned++; | |
8835 | node_detected_dev = list_entry(all_detected_devices.next, | |
8836 | struct detected_devices_node, list); | |
8837 | list_del(&node_detected_dev->list); | |
8838 | dev = node_detected_dev->dev; | |
8839 | kfree(node_detected_dev); | |
df968c4e | 8840 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8841 | if (IS_ERR(rdev)) |
8842 | continue; | |
8843 | ||
403df478 | 8844 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 8845 | continue; |
403df478 | 8846 | |
d0fae18f | 8847 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8848 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8849 | i_passed++; |
1da177e4 | 8850 | } |
4d936ec1 ME |
8851 | |
8852 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8853 | i_scanned, i_passed); | |
1da177e4 LT |
8854 | |
8855 | autorun_devices(part); | |
8856 | } | |
8857 | ||
fdee8ae4 | 8858 | #endif /* !MODULE */ |
1da177e4 LT |
8859 | |
8860 | static __exit void md_exit(void) | |
8861 | { | |
fd01b88c | 8862 | struct mddev *mddev; |
1da177e4 | 8863 | struct list_head *tmp; |
e2f23b60 | 8864 | int delay = 1; |
8ab5e4c1 | 8865 | |
af5628f0 | 8866 | blk_unregister_region(MKDEV(MD_MAJOR,0), 512); |
e8703fe1 | 8867 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8868 | |
3dbd8c2e | 8869 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8870 | unregister_blkdev(mdp_major, "mdp"); |
8871 | unregister_reboot_notifier(&md_notifier); | |
8872 | unregister_sysctl_table(raid_table_header); | |
e2f23b60 N |
8873 | |
8874 | /* We cannot unload the modules while some process is | |
8875 | * waiting for us in select() or poll() - wake them up | |
8876 | */ | |
8877 | md_unloading = 1; | |
8878 | while (waitqueue_active(&md_event_waiters)) { | |
8879 | /* not safe to leave yet */ | |
8880 | wake_up(&md_event_waiters); | |
8881 | msleep(delay); | |
8882 | delay += delay; | |
8883 | } | |
1da177e4 | 8884 | remove_proc_entry("mdstat", NULL); |
e2f23b60 | 8885 | |
29ac4aa3 | 8886 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8887 | export_array(mddev); |
d3374825 | 8888 | mddev->hold_active = 0; |
1da177e4 | 8889 | } |
e804ac78 TH |
8890 | destroy_workqueue(md_misc_wq); |
8891 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8892 | } |
8893 | ||
685784aa | 8894 | subsys_initcall(md_init); |
1da177e4 LT |
8895 | module_exit(md_exit) |
8896 | ||
f91de92e N |
8897 | static int get_ro(char *buffer, struct kernel_param *kp) |
8898 | { | |
8899 | return sprintf(buffer, "%d", start_readonly); | |
8900 | } | |
8901 | static int set_ro(const char *val, struct kernel_param *kp) | |
8902 | { | |
4c9309c0 | 8903 | return kstrtouint(val, 10, (unsigned int *)&start_readonly); |
f91de92e N |
8904 | } |
8905 | ||
80ca3a44 N |
8906 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8907 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
efeb53c0 | 8908 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8909 | |
1da177e4 | 8910 | MODULE_LICENSE("GPL"); |
0efb9e61 | 8911 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8912 | MODULE_ALIAS("md"); |
72008652 | 8913 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |