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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
ff01bb48 | 39 | #include <linux/fs.h> |
d7603b7e | 40 | #include <linux/poll.h> |
16f17b39 | 41 | #include <linux/ctype.h> |
e7d2860b | 42 | #include <linux/string.h> |
fb4d8c76 N |
43 | #include <linux/hdreg.h> |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/random.h> | |
056075c7 | 46 | #include <linux/module.h> |
fb4d8c76 | 47 | #include <linux/reboot.h> |
32a7627c | 48 | #include <linux/file.h> |
aa98aa31 | 49 | #include <linux/compat.h> |
25570727 | 50 | #include <linux/delay.h> |
bff61975 N |
51 | #include <linux/raid/md_p.h> |
52 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
43b2e5d8 | 54 | #include "md.h" |
ef740c37 | 55 | #include "bitmap.h" |
1da177e4 | 56 | |
1da177e4 | 57 | #ifndef MODULE |
d710e138 | 58 | static void autostart_arrays(int part); |
1da177e4 LT |
59 | #endif |
60 | ||
01f96c0a N |
61 | /* pers_list is a list of registered personalities protected |
62 | * by pers_lock. | |
63 | * pers_lock does extra service to protect accesses to | |
64 | * mddev->thread when the mutex cannot be held. | |
65 | */ | |
2604b703 | 66 | static LIST_HEAD(pers_list); |
1da177e4 LT |
67 | static DEFINE_SPINLOCK(pers_lock); |
68 | ||
5e56341d AB |
69 | static void md_print_devices(void); |
70 | ||
90b08710 | 71 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
72 | static struct workqueue_struct *md_wq; |
73 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 74 | |
746d3207 N |
75 | static int remove_and_add_spares(struct mddev *mddev, |
76 | struct md_rdev *this); | |
77 | ||
5e56341d AB |
78 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
79 | ||
1e50915f RB |
80 | /* |
81 | * Default number of read corrections we'll attempt on an rdev | |
82 | * before ejecting it from the array. We divide the read error | |
83 | * count by 2 for every hour elapsed between read errors. | |
84 | */ | |
85 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
86 | /* |
87 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
88 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
89 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 90 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
91 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
92 | * speed limit - in case reconstruction slows down your system despite | |
93 | * idle IO detection. | |
94 | * | |
95 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 96 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
97 | */ |
98 | ||
99 | static int sysctl_speed_limit_min = 1000; | |
100 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 101 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
102 | { |
103 | return mddev->sync_speed_min ? | |
104 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
105 | } | |
106 | ||
fd01b88c | 107 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
108 | { |
109 | return mddev->sync_speed_max ? | |
110 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
111 | } | |
1da177e4 LT |
112 | |
113 | static struct ctl_table_header *raid_table_header; | |
114 | ||
115 | static ctl_table raid_table[] = { | |
116 | { | |
1da177e4 LT |
117 | .procname = "speed_limit_min", |
118 | .data = &sysctl_speed_limit_min, | |
119 | .maxlen = sizeof(int), | |
80ca3a44 | 120 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 121 | .proc_handler = proc_dointvec, |
1da177e4 LT |
122 | }, |
123 | { | |
1da177e4 LT |
124 | .procname = "speed_limit_max", |
125 | .data = &sysctl_speed_limit_max, | |
126 | .maxlen = sizeof(int), | |
80ca3a44 | 127 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 128 | .proc_handler = proc_dointvec, |
1da177e4 | 129 | }, |
894d2491 | 130 | { } |
1da177e4 LT |
131 | }; |
132 | ||
133 | static ctl_table raid_dir_table[] = { | |
134 | { | |
1da177e4 LT |
135 | .procname = "raid", |
136 | .maxlen = 0, | |
80ca3a44 | 137 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
138 | .child = raid_table, |
139 | }, | |
894d2491 | 140 | { } |
1da177e4 LT |
141 | }; |
142 | ||
143 | static ctl_table raid_root_table[] = { | |
144 | { | |
1da177e4 LT |
145 | .procname = "dev", |
146 | .maxlen = 0, | |
147 | .mode = 0555, | |
148 | .child = raid_dir_table, | |
149 | }, | |
894d2491 | 150 | { } |
1da177e4 LT |
151 | }; |
152 | ||
83d5cde4 | 153 | static const struct block_device_operations md_fops; |
1da177e4 | 154 | |
f91de92e N |
155 | static int start_readonly; |
156 | ||
a167f663 N |
157 | /* bio_clone_mddev |
158 | * like bio_clone, but with a local bio set | |
159 | */ | |
160 | ||
a167f663 | 161 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, |
fd01b88c | 162 | struct mddev *mddev) |
a167f663 N |
163 | { |
164 | struct bio *b; | |
a167f663 N |
165 | |
166 | if (!mddev || !mddev->bio_set) | |
167 | return bio_alloc(gfp_mask, nr_iovecs); | |
168 | ||
395c72a7 | 169 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, mddev->bio_set); |
a167f663 N |
170 | if (!b) |
171 | return NULL; | |
a167f663 N |
172 | return b; |
173 | } | |
174 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
175 | ||
176 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 177 | struct mddev *mddev) |
a167f663 | 178 | { |
a167f663 N |
179 | if (!mddev || !mddev->bio_set) |
180 | return bio_clone(bio, gfp_mask); | |
181 | ||
bf800ef1 | 182 | return bio_clone_bioset(bio, gfp_mask, mddev->bio_set); |
a167f663 N |
183 | } |
184 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
185 | ||
d2eb35ac N |
186 | void md_trim_bio(struct bio *bio, int offset, int size) |
187 | { | |
188 | /* 'bio' is a cloned bio which we need to trim to match | |
189 | * the given offset and size. | |
190 | * This requires adjusting bi_sector, bi_size, and bi_io_vec | |
191 | */ | |
192 | int i; | |
193 | struct bio_vec *bvec; | |
194 | int sofar = 0; | |
195 | ||
196 | size <<= 9; | |
197 | if (offset == 0 && size == bio->bi_size) | |
198 | return; | |
199 | ||
d2eb35ac N |
200 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); |
201 | ||
fb9e3534 KO |
202 | bio_advance(bio, offset << 9); |
203 | ||
204 | bio->bi_size = size; | |
205 | ||
d2eb35ac N |
206 | /* avoid any complications with bi_idx being non-zero*/ |
207 | if (bio->bi_idx) { | |
208 | memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx, | |
209 | (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec)); | |
210 | bio->bi_vcnt -= bio->bi_idx; | |
211 | bio->bi_idx = 0; | |
212 | } | |
213 | /* Make sure vcnt and last bv are not too big */ | |
214 | bio_for_each_segment(bvec, bio, i) { | |
215 | if (sofar + bvec->bv_len > size) | |
216 | bvec->bv_len = size - sofar; | |
217 | if (bvec->bv_len == 0) { | |
218 | bio->bi_vcnt = i; | |
219 | break; | |
220 | } | |
221 | sofar += bvec->bv_len; | |
222 | } | |
223 | } | |
224 | EXPORT_SYMBOL_GPL(md_trim_bio); | |
225 | ||
d7603b7e N |
226 | /* |
227 | * We have a system wide 'event count' that is incremented | |
228 | * on any 'interesting' event, and readers of /proc/mdstat | |
229 | * can use 'poll' or 'select' to find out when the event | |
230 | * count increases. | |
231 | * | |
232 | * Events are: | |
233 | * start array, stop array, error, add device, remove device, | |
234 | * start build, activate spare | |
235 | */ | |
2989ddbd | 236 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 237 | static atomic_t md_event_count; |
fd01b88c | 238 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
239 | { |
240 | atomic_inc(&md_event_count); | |
241 | wake_up(&md_event_waiters); | |
242 | } | |
29269553 | 243 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 244 | |
c331eb04 N |
245 | /* Alternate version that can be called from interrupts |
246 | * when calling sysfs_notify isn't needed. | |
247 | */ | |
fd01b88c | 248 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
249 | { |
250 | atomic_inc(&md_event_count); | |
251 | wake_up(&md_event_waiters); | |
252 | } | |
253 | ||
1da177e4 LT |
254 | /* |
255 | * Enables to iterate over all existing md arrays | |
256 | * all_mddevs_lock protects this list. | |
257 | */ | |
258 | static LIST_HEAD(all_mddevs); | |
259 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
260 | ||
261 | ||
262 | /* | |
263 | * iterates through all used mddevs in the system. | |
264 | * We take care to grab the all_mddevs_lock whenever navigating | |
265 | * the list, and to always hold a refcount when unlocked. | |
266 | * Any code which breaks out of this loop while own | |
267 | * a reference to the current mddev and must mddev_put it. | |
268 | */ | |
fd01b88c | 269 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 LT |
270 | \ |
271 | for (({ spin_lock(&all_mddevs_lock); \ | |
fd01b88c N |
272 | _tmp = all_mddevs.next; \ |
273 | _mddev = NULL;}); \ | |
274 | ({ if (_tmp != &all_mddevs) \ | |
275 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 276 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
277 | if (_mddev) mddev_put(_mddev); \ |
278 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
279 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 280 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 281 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
282 | ) |
283 | ||
284 | ||
409c57f3 N |
285 | /* Rather than calling directly into the personality make_request function, |
286 | * IO requests come here first so that we can check if the device is | |
287 | * being suspended pending a reconfiguration. | |
288 | * We hold a refcount over the call to ->make_request. By the time that | |
289 | * call has finished, the bio has been linked into some internal structure | |
290 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
291 | */ | |
5a7bbad2 | 292 | static void md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 293 | { |
49077326 | 294 | const int rw = bio_data_dir(bio); |
fd01b88c | 295 | struct mddev *mddev = q->queuedata; |
49077326 | 296 | int cpu; |
e91ece55 | 297 | unsigned int sectors; |
49077326 | 298 | |
0ca69886 N |
299 | if (mddev == NULL || mddev->pers == NULL |
300 | || !mddev->ready) { | |
409c57f3 | 301 | bio_io_error(bio); |
5a7bbad2 | 302 | return; |
409c57f3 | 303 | } |
bbfa57c0 SR |
304 | if (mddev->ro == 1 && unlikely(rw == WRITE)) { |
305 | bio_endio(bio, bio_sectors(bio) == 0 ? 0 : -EROFS); | |
306 | return; | |
307 | } | |
0ca69886 | 308 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 309 | rcu_read_lock(); |
e9c7469b | 310 | if (mddev->suspended) { |
409c57f3 N |
311 | DEFINE_WAIT(__wait); |
312 | for (;;) { | |
313 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
314 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 315 | if (!mddev->suspended) |
409c57f3 N |
316 | break; |
317 | rcu_read_unlock(); | |
318 | schedule(); | |
319 | rcu_read_lock(); | |
320 | } | |
321 | finish_wait(&mddev->sb_wait, &__wait); | |
322 | } | |
323 | atomic_inc(&mddev->active_io); | |
324 | rcu_read_unlock(); | |
49077326 | 325 | |
e91ece55 CM |
326 | /* |
327 | * save the sectors now since our bio can | |
328 | * go away inside make_request | |
329 | */ | |
330 | sectors = bio_sectors(bio); | |
5a7bbad2 | 331 | mddev->pers->make_request(mddev, bio); |
49077326 N |
332 | |
333 | cpu = part_stat_lock(); | |
334 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
e91ece55 | 335 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); |
49077326 N |
336 | part_stat_unlock(); |
337 | ||
409c57f3 N |
338 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
339 | wake_up(&mddev->sb_wait); | |
409c57f3 N |
340 | } |
341 | ||
9e35b99c N |
342 | /* mddev_suspend makes sure no new requests are submitted |
343 | * to the device, and that any requests that have been submitted | |
344 | * are completely handled. | |
345 | * Once ->stop is called and completes, the module will be completely | |
346 | * unused. | |
347 | */ | |
fd01b88c | 348 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
349 | { |
350 | BUG_ON(mddev->suspended); | |
351 | mddev->suspended = 1; | |
352 | synchronize_rcu(); | |
353 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
354 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
355 | |
356 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 357 | } |
390ee602 | 358 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 359 | |
fd01b88c | 360 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
361 | { |
362 | mddev->suspended = 0; | |
363 | wake_up(&mddev->sb_wait); | |
364 | mddev->pers->quiesce(mddev, 0); | |
0fd018af | 365 | |
47525e59 | 366 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
0fd018af JB |
367 | md_wakeup_thread(mddev->thread); |
368 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 369 | } |
390ee602 | 370 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 371 | |
fd01b88c | 372 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 N |
373 | { |
374 | return mddev->suspended; | |
375 | } | |
376 | EXPORT_SYMBOL(mddev_congested); | |
377 | ||
a2826aa9 | 378 | /* |
e9c7469b | 379 | * Generic flush handling for md |
a2826aa9 N |
380 | */ |
381 | ||
e9c7469b | 382 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 | 383 | { |
3cb03002 | 384 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 385 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
386 | |
387 | rdev_dec_pending(rdev, mddev); | |
388 | ||
389 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 390 | /* The pre-request flush has finished */ |
e804ac78 | 391 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
392 | } |
393 | bio_put(bio); | |
394 | } | |
395 | ||
a7a07e69 N |
396 | static void md_submit_flush_data(struct work_struct *ws); |
397 | ||
a035fc3e | 398 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 399 | { |
fd01b88c | 400 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 401 | struct md_rdev *rdev; |
a2826aa9 | 402 | |
a7a07e69 N |
403 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
404 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 405 | rcu_read_lock(); |
dafb20fa | 406 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
407 | if (rdev->raid_disk >= 0 && |
408 | !test_bit(Faulty, &rdev->flags)) { | |
409 | /* Take two references, one is dropped | |
410 | * when request finishes, one after | |
411 | * we reclaim rcu_read_lock | |
412 | */ | |
413 | struct bio *bi; | |
414 | atomic_inc(&rdev->nr_pending); | |
415 | atomic_inc(&rdev->nr_pending); | |
416 | rcu_read_unlock(); | |
b5e1b8ce | 417 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 418 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
419 | bi->bi_private = rdev; |
420 | bi->bi_bdev = rdev->bdev; | |
421 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 422 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
423 | rcu_read_lock(); |
424 | rdev_dec_pending(rdev, mddev); | |
425 | } | |
426 | rcu_read_unlock(); | |
a7a07e69 N |
427 | if (atomic_dec_and_test(&mddev->flush_pending)) |
428 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
429 | } |
430 | ||
e9c7469b | 431 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 432 | { |
fd01b88c | 433 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 434 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 435 | |
e9c7469b | 436 | if (bio->bi_size == 0) |
a2826aa9 N |
437 | /* an empty barrier - all done */ |
438 | bio_endio(bio, 0); | |
439 | else { | |
e9c7469b | 440 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 441 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 442 | } |
2b74e12e N |
443 | |
444 | mddev->flush_bio = NULL; | |
445 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
446 | } |
447 | ||
fd01b88c | 448 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 N |
449 | { |
450 | spin_lock_irq(&mddev->write_lock); | |
451 | wait_event_lock_irq(mddev->sb_wait, | |
e9c7469b | 452 | !mddev->flush_bio, |
eed8c02e | 453 | mddev->write_lock); |
e9c7469b | 454 | mddev->flush_bio = bio; |
a2826aa9 N |
455 | spin_unlock_irq(&mddev->write_lock); |
456 | ||
a035fc3e N |
457 | INIT_WORK(&mddev->flush_work, submit_flushes); |
458 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 459 | } |
e9c7469b | 460 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 461 | |
74018dc3 | 462 | void md_unplug(struct blk_plug_cb *cb, bool from_schedule) |
97658cdd | 463 | { |
9cbb1750 N |
464 | struct mddev *mddev = cb->data; |
465 | md_wakeup_thread(mddev->thread); | |
466 | kfree(cb); | |
97658cdd | 467 | } |
9cbb1750 | 468 | EXPORT_SYMBOL(md_unplug); |
2ac87401 | 469 | |
fd01b88c | 470 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
471 | { |
472 | atomic_inc(&mddev->active); | |
473 | return mddev; | |
474 | } | |
475 | ||
5fd3a17e | 476 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 477 | |
fd01b88c | 478 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 479 | { |
a167f663 N |
480 | struct bio_set *bs = NULL; |
481 | ||
1da177e4 LT |
482 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
483 | return; | |
d3374825 | 484 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
485 | mddev->ctime == 0 && !mddev->hold_active) { |
486 | /* Array is not configured at all, and not held active, | |
487 | * so destroy it */ | |
af8a2434 | 488 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
489 | bs = mddev->bio_set; |
490 | mddev->bio_set = NULL; | |
d3374825 | 491 | if (mddev->gendisk) { |
e804ac78 TH |
492 | /* We did a probe so need to clean up. Call |
493 | * queue_work inside the spinlock so that | |
494 | * flush_workqueue() after mddev_find will | |
495 | * succeed in waiting for the work to be done. | |
d3374825 N |
496 | */ |
497 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 498 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
499 | } else |
500 | kfree(mddev); | |
501 | } | |
502 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
503 | if (bs) |
504 | bioset_free(bs); | |
1da177e4 LT |
505 | } |
506 | ||
fd01b88c | 507 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
508 | { |
509 | mutex_init(&mddev->open_mutex); | |
510 | mutex_init(&mddev->reconfig_mutex); | |
511 | mutex_init(&mddev->bitmap_info.mutex); | |
512 | INIT_LIST_HEAD(&mddev->disks); | |
513 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
514 | init_timer(&mddev->safemode_timer); | |
515 | atomic_set(&mddev->active, 1); | |
516 | atomic_set(&mddev->openers, 0); | |
517 | atomic_set(&mddev->active_io, 0); | |
518 | spin_lock_init(&mddev->write_lock); | |
519 | atomic_set(&mddev->flush_pending, 0); | |
520 | init_waitqueue_head(&mddev->sb_wait); | |
521 | init_waitqueue_head(&mddev->recovery_wait); | |
522 | mddev->reshape_position = MaxSector; | |
2c810cdd | 523 | mddev->reshape_backwards = 0; |
fafd7fb0 N |
524 | mddev->resync_min = 0; |
525 | mddev->resync_max = MaxSector; | |
526 | mddev->level = LEVEL_NONE; | |
527 | } | |
390ee602 | 528 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 529 | |
fd01b88c | 530 | static struct mddev * mddev_find(dev_t unit) |
1da177e4 | 531 | { |
fd01b88c | 532 | struct mddev *mddev, *new = NULL; |
1da177e4 | 533 | |
8f5f02c4 N |
534 | if (unit && MAJOR(unit) != MD_MAJOR) |
535 | unit &= ~((1<<MdpMinorShift)-1); | |
536 | ||
1da177e4 LT |
537 | retry: |
538 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
539 | |
540 | if (unit) { | |
541 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
542 | if (mddev->unit == unit) { | |
543 | mddev_get(mddev); | |
544 | spin_unlock(&all_mddevs_lock); | |
545 | kfree(new); | |
546 | return mddev; | |
547 | } | |
548 | ||
549 | if (new) { | |
550 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 551 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
552 | new->hold_active = UNTIL_IOCTL; |
553 | return new; | |
1da177e4 | 554 | } |
efeb53c0 N |
555 | } else if (new) { |
556 | /* find an unused unit number */ | |
557 | static int next_minor = 512; | |
558 | int start = next_minor; | |
559 | int is_free = 0; | |
560 | int dev = 0; | |
561 | while (!is_free) { | |
562 | dev = MKDEV(MD_MAJOR, next_minor); | |
563 | next_minor++; | |
564 | if (next_minor > MINORMASK) | |
565 | next_minor = 0; | |
566 | if (next_minor == start) { | |
567 | /* Oh dear, all in use. */ | |
568 | spin_unlock(&all_mddevs_lock); | |
569 | kfree(new); | |
570 | return NULL; | |
571 | } | |
572 | ||
573 | is_free = 1; | |
574 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
575 | if (mddev->unit == dev) { | |
576 | is_free = 0; | |
577 | break; | |
578 | } | |
579 | } | |
580 | new->unit = dev; | |
581 | new->md_minor = MINOR(dev); | |
582 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
583 | list_add(&new->all_mddevs, &all_mddevs); |
584 | spin_unlock(&all_mddevs_lock); | |
585 | return new; | |
586 | } | |
587 | spin_unlock(&all_mddevs_lock); | |
588 | ||
9ffae0cf | 589 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
590 | if (!new) |
591 | return NULL; | |
592 | ||
1da177e4 LT |
593 | new->unit = unit; |
594 | if (MAJOR(unit) == MD_MAJOR) | |
595 | new->md_minor = MINOR(unit); | |
596 | else | |
597 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
598 | ||
fafd7fb0 | 599 | mddev_init(new); |
1da177e4 | 600 | |
1da177e4 LT |
601 | goto retry; |
602 | } | |
603 | ||
fd01b88c | 604 | static inline int mddev_lock(struct mddev * mddev) |
1da177e4 | 605 | { |
df5b89b3 | 606 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
607 | } |
608 | ||
fd01b88c | 609 | static inline int mddev_is_locked(struct mddev *mddev) |
b522adcd DW |
610 | { |
611 | return mutex_is_locked(&mddev->reconfig_mutex); | |
612 | } | |
613 | ||
fd01b88c | 614 | static inline int mddev_trylock(struct mddev * mddev) |
1da177e4 | 615 | { |
df5b89b3 | 616 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
617 | } |
618 | ||
b6eb127d N |
619 | static struct attribute_group md_redundancy_group; |
620 | ||
fd01b88c | 621 | static void mddev_unlock(struct mddev * mddev) |
1da177e4 | 622 | { |
a64c876f | 623 | if (mddev->to_remove) { |
b6eb127d N |
624 | /* These cannot be removed under reconfig_mutex as |
625 | * an access to the files will try to take reconfig_mutex | |
626 | * while holding the file unremovable, which leads to | |
627 | * a deadlock. | |
bb4f1e9d N |
628 | * So hold set sysfs_active while the remove in happeing, |
629 | * and anything else which might set ->to_remove or my | |
630 | * otherwise change the sysfs namespace will fail with | |
631 | * -EBUSY if sysfs_active is still set. | |
632 | * We set sysfs_active under reconfig_mutex and elsewhere | |
633 | * test it under the same mutex to ensure its correct value | |
634 | * is seen. | |
b6eb127d | 635 | */ |
a64c876f N |
636 | struct attribute_group *to_remove = mddev->to_remove; |
637 | mddev->to_remove = NULL; | |
bb4f1e9d | 638 | mddev->sysfs_active = 1; |
b6eb127d N |
639 | mutex_unlock(&mddev->reconfig_mutex); |
640 | ||
00bcb4ac N |
641 | if (mddev->kobj.sd) { |
642 | if (to_remove != &md_redundancy_group) | |
643 | sysfs_remove_group(&mddev->kobj, to_remove); | |
644 | if (mddev->pers == NULL || | |
645 | mddev->pers->sync_request == NULL) { | |
646 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
647 | if (mddev->sysfs_action) | |
648 | sysfs_put(mddev->sysfs_action); | |
649 | mddev->sysfs_action = NULL; | |
650 | } | |
a64c876f | 651 | } |
bb4f1e9d | 652 | mddev->sysfs_active = 0; |
b6eb127d N |
653 | } else |
654 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 655 | |
751e67ca CD |
656 | /* As we've dropped the mutex we need a spinlock to |
657 | * make sure the thread doesn't disappear | |
01f96c0a N |
658 | */ |
659 | spin_lock(&pers_lock); | |
005eca5e | 660 | md_wakeup_thread(mddev->thread); |
01f96c0a | 661 | spin_unlock(&pers_lock); |
1da177e4 LT |
662 | } |
663 | ||
fd01b88c | 664 | static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr) |
1da177e4 | 665 | { |
3cb03002 | 666 | struct md_rdev *rdev; |
1da177e4 | 667 | |
dafb20fa | 668 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
669 | if (rdev->desc_nr == nr) |
670 | return rdev; | |
159ec1fc | 671 | |
1da177e4 LT |
672 | return NULL; |
673 | } | |
674 | ||
1ca69c4b N |
675 | static struct md_rdev *find_rdev_nr_rcu(struct mddev *mddev, int nr) |
676 | { | |
677 | struct md_rdev *rdev; | |
678 | ||
679 | rdev_for_each_rcu(rdev, mddev) | |
680 | if (rdev->desc_nr == nr) | |
681 | return rdev; | |
682 | ||
683 | return NULL; | |
684 | } | |
685 | ||
686 | static struct md_rdev *find_rdev(struct mddev *mddev, dev_t dev) | |
1da177e4 | 687 | { |
3cb03002 | 688 | struct md_rdev *rdev; |
1da177e4 | 689 | |
dafb20fa | 690 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
691 | if (rdev->bdev->bd_dev == dev) |
692 | return rdev; | |
159ec1fc | 693 | |
1da177e4 LT |
694 | return NULL; |
695 | } | |
696 | ||
1ca69c4b N |
697 | static struct md_rdev *find_rdev_rcu(struct mddev *mddev, dev_t dev) |
698 | { | |
699 | struct md_rdev *rdev; | |
700 | ||
701 | rdev_for_each_rcu(rdev, mddev) | |
702 | if (rdev->bdev->bd_dev == dev) | |
703 | return rdev; | |
704 | ||
705 | return NULL; | |
706 | } | |
707 | ||
84fc4b56 | 708 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 709 | { |
84fc4b56 | 710 | struct md_personality *pers; |
d9d166c2 N |
711 | list_for_each_entry(pers, &pers_list, list) { |
712 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 713 | return pers; |
d9d166c2 N |
714 | if (strcmp(pers->name, clevel)==0) |
715 | return pers; | |
716 | } | |
2604b703 N |
717 | return NULL; |
718 | } | |
719 | ||
b73df2d3 | 720 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 721 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 722 | { |
57b2caa3 | 723 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 724 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
725 | } |
726 | ||
3cb03002 | 727 | static int alloc_disk_sb(struct md_rdev * rdev) |
1da177e4 LT |
728 | { |
729 | if (rdev->sb_page) | |
730 | MD_BUG(); | |
731 | ||
732 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
733 | if (!rdev->sb_page) { | |
734 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 735 | return -ENOMEM; |
1da177e4 LT |
736 | } |
737 | ||
738 | return 0; | |
739 | } | |
740 | ||
545c8795 | 741 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
742 | { |
743 | if (rdev->sb_page) { | |
2d1f3b5d | 744 | put_page(rdev->sb_page); |
1da177e4 LT |
745 | rdev->sb_loaded = 0; |
746 | rdev->sb_page = NULL; | |
0f420358 | 747 | rdev->sb_start = 0; |
dd8ac336 | 748 | rdev->sectors = 0; |
1da177e4 | 749 | } |
2699b672 N |
750 | if (rdev->bb_page) { |
751 | put_page(rdev->bb_page); | |
752 | rdev->bb_page = NULL; | |
753 | } | |
4fa2f327 N |
754 | kfree(rdev->badblocks.page); |
755 | rdev->badblocks.page = NULL; | |
1da177e4 | 756 | } |
545c8795 | 757 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 758 | |
6712ecf8 | 759 | static void super_written(struct bio *bio, int error) |
7bfa19f2 | 760 | { |
3cb03002 | 761 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 762 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 763 | |
3a0f5bbb N |
764 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
765 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
766 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
767 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 768 | md_error(mddev, rdev); |
3a0f5bbb | 769 | } |
7bfa19f2 | 770 | |
a9701a30 N |
771 | if (atomic_dec_and_test(&mddev->pending_writes)) |
772 | wake_up(&mddev->sb_wait); | |
f8b58edf | 773 | bio_put(bio); |
7bfa19f2 N |
774 | } |
775 | ||
fd01b88c | 776 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
777 | sector_t sector, int size, struct page *page) |
778 | { | |
779 | /* write first size bytes of page to sector of rdev | |
780 | * Increment mddev->pending_writes before returning | |
781 | * and decrement it on completion, waking up sb_wait | |
782 | * if zero is reached. | |
783 | * If an error occurred, call md_error | |
784 | */ | |
a167f663 | 785 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 786 | |
a6ff7e08 | 787 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
7bfa19f2 N |
788 | bio->bi_sector = sector; |
789 | bio_add_page(bio, page, size, 0); | |
790 | bio->bi_private = rdev; | |
791 | bio->bi_end_io = super_written; | |
a9701a30 | 792 | |
7bfa19f2 | 793 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 794 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
795 | } |
796 | ||
fd01b88c | 797 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 798 | { |
e9c7469b | 799 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
800 | DEFINE_WAIT(wq); |
801 | for(;;) { | |
802 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
803 | if (atomic_read(&mddev->pending_writes)==0) | |
804 | break; | |
a9701a30 N |
805 | schedule(); |
806 | } | |
807 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
808 | } |
809 | ||
6712ecf8 | 810 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 811 | { |
1da177e4 | 812 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
813 | } |
814 | ||
3cb03002 | 815 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 816 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 817 | { |
a167f663 | 818 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
819 | struct completion event; |
820 | int ret; | |
821 | ||
721a9602 | 822 | rw |= REQ_SYNC; |
1da177e4 | 823 | |
a6ff7e08 JB |
824 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
825 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 JB |
826 | if (metadata_op) |
827 | bio->bi_sector = sector + rdev->sb_start; | |
1fdd6fc9 N |
828 | else if (rdev->mddev->reshape_position != MaxSector && |
829 | (rdev->mddev->reshape_backwards == | |
830 | (sector >= rdev->mddev->reshape_position))) | |
831 | bio->bi_sector = sector + rdev->new_data_offset; | |
ccebd4c4 JB |
832 | else |
833 | bio->bi_sector = sector + rdev->data_offset; | |
1da177e4 LT |
834 | bio_add_page(bio, page, size, 0); |
835 | init_completion(&event); | |
836 | bio->bi_private = &event; | |
837 | bio->bi_end_io = bi_complete; | |
838 | submit_bio(rw, bio); | |
839 | wait_for_completion(&event); | |
840 | ||
841 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
842 | bio_put(bio); | |
843 | return ret; | |
844 | } | |
a8745db2 | 845 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 846 | |
3cb03002 | 847 | static int read_disk_sb(struct md_rdev * rdev, int size) |
1da177e4 LT |
848 | { |
849 | char b[BDEVNAME_SIZE]; | |
850 | if (!rdev->sb_page) { | |
851 | MD_BUG(); | |
852 | return -EINVAL; | |
853 | } | |
854 | if (rdev->sb_loaded) | |
855 | return 0; | |
856 | ||
857 | ||
ccebd4c4 | 858 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
859 | goto fail; |
860 | rdev->sb_loaded = 1; | |
861 | return 0; | |
862 | ||
863 | fail: | |
864 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
865 | bdevname(rdev->bdev,b)); | |
866 | return -EINVAL; | |
867 | } | |
868 | ||
869 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
870 | { | |
05710466 AN |
871 | return sb1->set_uuid0 == sb2->set_uuid0 && |
872 | sb1->set_uuid1 == sb2->set_uuid1 && | |
873 | sb1->set_uuid2 == sb2->set_uuid2 && | |
874 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
875 | } |
876 | ||
1da177e4 LT |
877 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
878 | { | |
879 | int ret; | |
880 | mdp_super_t *tmp1, *tmp2; | |
881 | ||
882 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
883 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
884 | ||
885 | if (!tmp1 || !tmp2) { | |
886 | ret = 0; | |
35020f1a | 887 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
888 | goto abort; |
889 | } | |
890 | ||
891 | *tmp1 = *sb1; | |
892 | *tmp2 = *sb2; | |
893 | ||
894 | /* | |
895 | * nr_disks is not constant | |
896 | */ | |
897 | tmp1->nr_disks = 0; | |
898 | tmp2->nr_disks = 0; | |
899 | ||
ce0c8e05 | 900 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 901 | abort: |
990a8baf JJ |
902 | kfree(tmp1); |
903 | kfree(tmp2); | |
1da177e4 LT |
904 | return ret; |
905 | } | |
906 | ||
4d167f09 N |
907 | |
908 | static u32 md_csum_fold(u32 csum) | |
909 | { | |
910 | csum = (csum & 0xffff) + (csum >> 16); | |
911 | return (csum & 0xffff) + (csum >> 16); | |
912 | } | |
913 | ||
1da177e4 LT |
914 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
915 | { | |
4d167f09 N |
916 | u64 newcsum = 0; |
917 | u32 *sb32 = (u32*)sb; | |
918 | int i; | |
1da177e4 LT |
919 | unsigned int disk_csum, csum; |
920 | ||
921 | disk_csum = sb->sb_csum; | |
922 | sb->sb_csum = 0; | |
4d167f09 N |
923 | |
924 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
925 | newcsum += sb32[i]; | |
926 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
927 | ||
928 | ||
929 | #ifdef CONFIG_ALPHA | |
930 | /* This used to use csum_partial, which was wrong for several | |
931 | * reasons including that different results are returned on | |
932 | * different architectures. It isn't critical that we get exactly | |
933 | * the same return value as before (we always csum_fold before | |
934 | * testing, and that removes any differences). However as we | |
935 | * know that csum_partial always returned a 16bit value on | |
936 | * alphas, do a fold to maximise conformity to previous behaviour. | |
937 | */ | |
938 | sb->sb_csum = md_csum_fold(disk_csum); | |
939 | #else | |
1da177e4 | 940 | sb->sb_csum = disk_csum; |
4d167f09 | 941 | #endif |
1da177e4 LT |
942 | return csum; |
943 | } | |
944 | ||
945 | ||
946 | /* | |
947 | * Handle superblock details. | |
948 | * We want to be able to handle multiple superblock formats | |
949 | * so we have a common interface to them all, and an array of | |
950 | * different handlers. | |
951 | * We rely on user-space to write the initial superblock, and support | |
952 | * reading and updating of superblocks. | |
953 | * Interface methods are: | |
3cb03002 | 954 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
955 | * loads and validates a superblock on dev. |
956 | * if refdev != NULL, compare superblocks on both devices | |
957 | * Return: | |
958 | * 0 - dev has a superblock that is compatible with refdev | |
959 | * 1 - dev has a superblock that is compatible and newer than refdev | |
960 | * so dev should be used as the refdev in future | |
961 | * -EINVAL superblock incompatible or invalid | |
962 | * -othererror e.g. -EIO | |
963 | * | |
fd01b88c | 964 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
965 | * Verify that dev is acceptable into mddev. |
966 | * The first time, mddev->raid_disks will be 0, and data from | |
967 | * dev should be merged in. Subsequent calls check that dev | |
968 | * is new enough. Return 0 or -EINVAL | |
969 | * | |
fd01b88c | 970 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
971 | * Update the superblock for rdev with data in mddev |
972 | * This does not write to disc. | |
973 | * | |
974 | */ | |
975 | ||
976 | struct super_type { | |
0cd17fec CW |
977 | char *name; |
978 | struct module *owner; | |
c6563a8c N |
979 | int (*load_super)(struct md_rdev *rdev, |
980 | struct md_rdev *refdev, | |
0cd17fec | 981 | int minor_version); |
c6563a8c N |
982 | int (*validate_super)(struct mddev *mddev, |
983 | struct md_rdev *rdev); | |
984 | void (*sync_super)(struct mddev *mddev, | |
985 | struct md_rdev *rdev); | |
3cb03002 | 986 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 987 | sector_t num_sectors); |
c6563a8c N |
988 | int (*allow_new_offset)(struct md_rdev *rdev, |
989 | unsigned long long new_offset); | |
1da177e4 LT |
990 | }; |
991 | ||
0894cc30 AN |
992 | /* |
993 | * Check that the given mddev has no bitmap. | |
994 | * | |
995 | * This function is called from the run method of all personalities that do not | |
996 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
997 | * has a bitmap. Otherwise, it returns 0. | |
998 | * | |
999 | */ | |
fd01b88c | 1000 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 1001 | { |
c3d9714e | 1002 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
1003 | return 0; |
1004 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
1005 | mdname(mddev), mddev->pers->name); | |
1006 | return 1; | |
1007 | } | |
1008 | EXPORT_SYMBOL(md_check_no_bitmap); | |
1009 | ||
1da177e4 LT |
1010 | /* |
1011 | * load_super for 0.90.0 | |
1012 | */ | |
3cb03002 | 1013 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1014 | { |
1015 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
1016 | mdp_super_t *sb; | |
1017 | int ret; | |
1da177e4 LT |
1018 | |
1019 | /* | |
0f420358 | 1020 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
1021 | * it's at the end of the disk. |
1022 | * | |
1023 | * It also happens to be a multiple of 4Kb. | |
1024 | */ | |
57b2caa3 | 1025 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 1026 | |
0002b271 | 1027 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
1028 | if (ret) return ret; |
1029 | ||
1030 | ret = -EINVAL; | |
1031 | ||
1032 | bdevname(rdev->bdev, b); | |
65a06f06 | 1033 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1034 | |
1035 | if (sb->md_magic != MD_SB_MAGIC) { | |
1036 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
1037 | b); | |
1038 | goto abort; | |
1039 | } | |
1040 | ||
1041 | if (sb->major_version != 0 || | |
f6705578 N |
1042 | sb->minor_version < 90 || |
1043 | sb->minor_version > 91) { | |
1da177e4 LT |
1044 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1045 | sb->major_version, sb->minor_version, | |
1046 | b); | |
1047 | goto abort; | |
1048 | } | |
1049 | ||
1050 | if (sb->raid_disks <= 0) | |
1051 | goto abort; | |
1052 | ||
4d167f09 | 1053 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1054 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1055 | b); | |
1056 | goto abort; | |
1057 | } | |
1058 | ||
1059 | rdev->preferred_minor = sb->md_minor; | |
1060 | rdev->data_offset = 0; | |
c6563a8c | 1061 | rdev->new_data_offset = 0; |
0002b271 | 1062 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1063 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1064 | |
1065 | if (sb->level == LEVEL_MULTIPATH) | |
1066 | rdev->desc_nr = -1; | |
1067 | else | |
1068 | rdev->desc_nr = sb->this_disk.number; | |
1069 | ||
9a7b2b0f | 1070 | if (!refdev) { |
1da177e4 | 1071 | ret = 1; |
9a7b2b0f | 1072 | } else { |
1da177e4 | 1073 | __u64 ev1, ev2; |
65a06f06 | 1074 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1075 | if (!uuid_equal(refsb, sb)) { |
1076 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1077 | b, bdevname(refdev->bdev,b2)); | |
1078 | goto abort; | |
1079 | } | |
1080 | if (!sb_equal(refsb, sb)) { | |
1081 | printk(KERN_WARNING "md: %s has same UUID" | |
1082 | " but different superblock to %s\n", | |
1083 | b, bdevname(refdev->bdev, b2)); | |
1084 | goto abort; | |
1085 | } | |
1086 | ev1 = md_event(sb); | |
1087 | ev2 = md_event(refsb); | |
1088 | if (ev1 > ev2) | |
1089 | ret = 1; | |
1090 | else | |
1091 | ret = 0; | |
1092 | } | |
8190e754 | 1093 | rdev->sectors = rdev->sb_start; |
667a5313 N |
1094 | /* Limit to 4TB as metadata cannot record more than that. |
1095 | * (not needed for Linear and RAID0 as metadata doesn't | |
1096 | * record this size) | |
1097 | */ | |
1098 | if (rdev->sectors >= (2ULL << 32) && sb->level >= 1) | |
27a7b260 | 1099 | rdev->sectors = (2ULL << 32) - 2; |
1da177e4 | 1100 | |
27a7b260 | 1101 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1102 | /* "this cannot possibly happen" ... */ |
1103 | ret = -EINVAL; | |
1104 | ||
1da177e4 LT |
1105 | abort: |
1106 | return ret; | |
1107 | } | |
1108 | ||
1109 | /* | |
1110 | * validate_super for 0.90.0 | |
1111 | */ | |
fd01b88c | 1112 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1113 | { |
1114 | mdp_disk_t *desc; | |
65a06f06 | 1115 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1116 | __u64 ev1 = md_event(sb); |
1da177e4 | 1117 | |
41158c7e | 1118 | rdev->raid_disk = -1; |
c5d79adb N |
1119 | clear_bit(Faulty, &rdev->flags); |
1120 | clear_bit(In_sync, &rdev->flags); | |
1121 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1122 | |
1da177e4 LT |
1123 | if (mddev->raid_disks == 0) { |
1124 | mddev->major_version = 0; | |
1125 | mddev->minor_version = sb->minor_version; | |
1126 | mddev->patch_version = sb->patch_version; | |
e691063a | 1127 | mddev->external = 0; |
9d8f0363 | 1128 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1129 | mddev->ctime = sb->ctime; |
1130 | mddev->utime = sb->utime; | |
1131 | mddev->level = sb->level; | |
d9d166c2 | 1132 | mddev->clevel[0] = 0; |
1da177e4 LT |
1133 | mddev->layout = sb->layout; |
1134 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1135 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1136 | mddev->events = ev1; |
c3d9714e | 1137 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1138 | mddev->bitmap_info.space = 0; |
1139 | /* bitmap can use 60 K after the 4K superblocks */ | |
c3d9714e | 1140 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 1141 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
2c810cdd | 1142 | mddev->reshape_backwards = 0; |
1da177e4 | 1143 | |
f6705578 N |
1144 | if (mddev->minor_version >= 91) { |
1145 | mddev->reshape_position = sb->reshape_position; | |
1146 | mddev->delta_disks = sb->delta_disks; | |
1147 | mddev->new_level = sb->new_level; | |
1148 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1149 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1150 | if (mddev->delta_disks < 0) |
1151 | mddev->reshape_backwards = 1; | |
f6705578 N |
1152 | } else { |
1153 | mddev->reshape_position = MaxSector; | |
1154 | mddev->delta_disks = 0; | |
1155 | mddev->new_level = mddev->level; | |
1156 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1157 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1158 | } |
1159 | ||
1da177e4 LT |
1160 | if (sb->state & (1<<MD_SB_CLEAN)) |
1161 | mddev->recovery_cp = MaxSector; | |
1162 | else { | |
1163 | if (sb->events_hi == sb->cp_events_hi && | |
1164 | sb->events_lo == sb->cp_events_lo) { | |
1165 | mddev->recovery_cp = sb->recovery_cp; | |
1166 | } else | |
1167 | mddev->recovery_cp = 0; | |
1168 | } | |
1169 | ||
1170 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1171 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1172 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1173 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1174 | ||
1175 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1176 | |
1177 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
6409bb05 | 1178 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1179 | mddev->bitmap_info.offset = |
1180 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
1181 | mddev->bitmap_info.space = |
1182 | mddev->bitmap_info.space; | |
1183 | } | |
a654b9d8 | 1184 | |
41158c7e | 1185 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1186 | /* Insist on good event counter while assembling, except |
1187 | * for spares (which don't need an event count) */ | |
1da177e4 | 1188 | ++ev1; |
be6800a7 N |
1189 | if (sb->disks[rdev->desc_nr].state & ( |
1190 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1191 | if (ev1 < mddev->events) | |
1192 | return -EINVAL; | |
41158c7e N |
1193 | } else if (mddev->bitmap) { |
1194 | /* if adding to array with a bitmap, then we can accept an | |
1195 | * older device ... but not too old. | |
1196 | */ | |
41158c7e N |
1197 | if (ev1 < mddev->bitmap->events_cleared) |
1198 | return 0; | |
07d84d10 N |
1199 | } else { |
1200 | if (ev1 < mddev->events) | |
1201 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1202 | return 0; | |
1203 | } | |
41158c7e | 1204 | |
1da177e4 | 1205 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1206 | desc = sb->disks + rdev->desc_nr; |
1207 | ||
1208 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1209 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1210 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1211 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1212 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1213 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1214 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1215 | /* active but not in sync implies recovery up to | |
1216 | * reshape position. We don't know exactly where | |
1217 | * that is, so set to zero for now */ | |
1218 | if (mddev->minor_version >= 91) { | |
1219 | rdev->recovery_offset = 0; | |
1220 | rdev->raid_disk = desc->raid_disk; | |
1221 | } | |
1da177e4 | 1222 | } |
8ddf9efe N |
1223 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1224 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1225 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1226 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1227 | return 0; |
1228 | } | |
1229 | ||
1230 | /* | |
1231 | * sync_super for 0.90.0 | |
1232 | */ | |
fd01b88c | 1233 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1234 | { |
1235 | mdp_super_t *sb; | |
3cb03002 | 1236 | struct md_rdev *rdev2; |
1da177e4 | 1237 | int next_spare = mddev->raid_disks; |
19133a42 | 1238 | |
1da177e4 LT |
1239 | |
1240 | /* make rdev->sb match mddev data.. | |
1241 | * | |
1242 | * 1/ zero out disks | |
1243 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1244 | * 3/ any empty disks < next_spare become removed | |
1245 | * | |
1246 | * disks[0] gets initialised to REMOVED because | |
1247 | * we cannot be sure from other fields if it has | |
1248 | * been initialised or not. | |
1249 | */ | |
1250 | int i; | |
1251 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1252 | ||
61181565 N |
1253 | rdev->sb_size = MD_SB_BYTES; |
1254 | ||
65a06f06 | 1255 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1256 | |
1257 | memset(sb, 0, sizeof(*sb)); | |
1258 | ||
1259 | sb->md_magic = MD_SB_MAGIC; | |
1260 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1261 | sb->patch_version = mddev->patch_version; |
1262 | sb->gvalid_words = 0; /* ignored */ | |
1263 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1264 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1265 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1266 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1267 | ||
1268 | sb->ctime = mddev->ctime; | |
1269 | sb->level = mddev->level; | |
58c0fed4 | 1270 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1271 | sb->raid_disks = mddev->raid_disks; |
1272 | sb->md_minor = mddev->md_minor; | |
e691063a | 1273 | sb->not_persistent = 0; |
1da177e4 LT |
1274 | sb->utime = mddev->utime; |
1275 | sb->state = 0; | |
1276 | sb->events_hi = (mddev->events>>32); | |
1277 | sb->events_lo = (u32)mddev->events; | |
1278 | ||
f6705578 N |
1279 | if (mddev->reshape_position == MaxSector) |
1280 | sb->minor_version = 90; | |
1281 | else { | |
1282 | sb->minor_version = 91; | |
1283 | sb->reshape_position = mddev->reshape_position; | |
1284 | sb->new_level = mddev->new_level; | |
1285 | sb->delta_disks = mddev->delta_disks; | |
1286 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1287 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1288 | } |
1289 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1290 | if (mddev->in_sync) |
1291 | { | |
1292 | sb->recovery_cp = mddev->recovery_cp; | |
1293 | sb->cp_events_hi = (mddev->events>>32); | |
1294 | sb->cp_events_lo = (u32)mddev->events; | |
1295 | if (mddev->recovery_cp == MaxSector) | |
1296 | sb->state = (1<< MD_SB_CLEAN); | |
1297 | } else | |
1298 | sb->recovery_cp = 0; | |
1299 | ||
1300 | sb->layout = mddev->layout; | |
9d8f0363 | 1301 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1302 | |
c3d9714e | 1303 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1304 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1305 | ||
1da177e4 | 1306 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1307 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1308 | mdp_disk_t *d; |
86e6ffdd | 1309 | int desc_nr; |
0261cd9f N |
1310 | int is_active = test_bit(In_sync, &rdev2->flags); |
1311 | ||
1312 | if (rdev2->raid_disk >= 0 && | |
1313 | sb->minor_version >= 91) | |
1314 | /* we have nowhere to store the recovery_offset, | |
1315 | * but if it is not below the reshape_position, | |
1316 | * we can piggy-back on that. | |
1317 | */ | |
1318 | is_active = 1; | |
1319 | if (rdev2->raid_disk < 0 || | |
1320 | test_bit(Faulty, &rdev2->flags)) | |
1321 | is_active = 0; | |
1322 | if (is_active) | |
86e6ffdd | 1323 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1324 | else |
86e6ffdd | 1325 | desc_nr = next_spare++; |
19133a42 | 1326 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1327 | d = &sb->disks[rdev2->desc_nr]; |
1328 | nr_disks++; | |
1329 | d->number = rdev2->desc_nr; | |
1330 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1331 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1332 | if (is_active) |
1da177e4 LT |
1333 | d->raid_disk = rdev2->raid_disk; |
1334 | else | |
1335 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1336 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1337 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1338 | else if (is_active) { |
1da177e4 | 1339 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1340 | if (test_bit(In_sync, &rdev2->flags)) |
1341 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1342 | active++; |
1343 | working++; | |
1344 | } else { | |
1345 | d->state = 0; | |
1346 | spare++; | |
1347 | working++; | |
1348 | } | |
8ddf9efe N |
1349 | if (test_bit(WriteMostly, &rdev2->flags)) |
1350 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1351 | } |
1da177e4 LT |
1352 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1353 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1354 | mdp_disk_t *d = &sb->disks[i]; | |
1355 | if (d->state == 0 && d->number == 0) { | |
1356 | d->number = i; | |
1357 | d->raid_disk = i; | |
1358 | d->state = (1<<MD_DISK_REMOVED); | |
1359 | d->state |= (1<<MD_DISK_FAULTY); | |
1360 | failed++; | |
1361 | } | |
1362 | } | |
1363 | sb->nr_disks = nr_disks; | |
1364 | sb->active_disks = active; | |
1365 | sb->working_disks = working; | |
1366 | sb->failed_disks = failed; | |
1367 | sb->spare_disks = spare; | |
1368 | ||
1369 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1370 | sb->sb_csum = calc_sb_csum(sb); | |
1371 | } | |
1372 | ||
0cd17fec CW |
1373 | /* |
1374 | * rdev_size_change for 0.90.0 | |
1375 | */ | |
1376 | static unsigned long long | |
3cb03002 | 1377 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1378 | { |
58c0fed4 | 1379 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1380 | return 0; /* component must fit device */ |
c3d9714e | 1381 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1382 | return 0; /* can't move bitmap */ |
57b2caa3 | 1383 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1384 | if (!num_sectors || num_sectors > rdev->sb_start) |
1385 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1386 | /* Limit to 4TB as metadata cannot record more than that. |
1387 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1388 | */ | |
667a5313 | 1389 | if (num_sectors >= (2ULL << 32) && rdev->mddev->level >= 1) |
27a7b260 | 1390 | num_sectors = (2ULL << 32) - 2; |
0f420358 | 1391 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1392 | rdev->sb_page); |
1393 | md_super_wait(rdev->mddev); | |
c26a44ed | 1394 | return num_sectors; |
0cd17fec CW |
1395 | } |
1396 | ||
c6563a8c N |
1397 | static int |
1398 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1399 | { | |
1400 | /* non-zero offset changes not possible with v0.90 */ | |
1401 | return new_offset == 0; | |
1402 | } | |
0cd17fec | 1403 | |
1da177e4 LT |
1404 | /* |
1405 | * version 1 superblock | |
1406 | */ | |
1407 | ||
1c05b4bc | 1408 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1409 | { |
1c05b4bc N |
1410 | __le32 disk_csum; |
1411 | u32 csum; | |
1da177e4 LT |
1412 | unsigned long long newcsum; |
1413 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1414 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1415 | |
1416 | disk_csum = sb->sb_csum; | |
1417 | sb->sb_csum = 0; | |
1418 | newcsum = 0; | |
1f3c9907 | 1419 | for (; size >= 4; size -= 4) |
1da177e4 LT |
1420 | newcsum += le32_to_cpu(*isuper++); |
1421 | ||
1422 | if (size == 2) | |
1c05b4bc | 1423 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1424 | |
1425 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1426 | sb->sb_csum = disk_csum; | |
1427 | return cpu_to_le32(csum); | |
1428 | } | |
1429 | ||
2699b672 N |
1430 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1431 | int acknowledged); | |
3cb03002 | 1432 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1433 | { |
1434 | struct mdp_superblock_1 *sb; | |
1435 | int ret; | |
0f420358 | 1436 | sector_t sb_start; |
c6563a8c | 1437 | sector_t sectors; |
1da177e4 | 1438 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1439 | int bmask; |
1da177e4 LT |
1440 | |
1441 | /* | |
0f420358 | 1442 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1443 | * It is always aligned to a 4K boundary and |
1444 | * depeding on minor_version, it can be: | |
1445 | * 0: At least 8K, but less than 12K, from end of device | |
1446 | * 1: At start of device | |
1447 | * 2: 4K from start of device. | |
1448 | */ | |
1449 | switch(minor_version) { | |
1450 | case 0: | |
77304d2a | 1451 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1452 | sb_start -= 8*2; |
1453 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1454 | break; |
1455 | case 1: | |
0f420358 | 1456 | sb_start = 0; |
1da177e4 LT |
1457 | break; |
1458 | case 2: | |
0f420358 | 1459 | sb_start = 8; |
1da177e4 LT |
1460 | break; |
1461 | default: | |
1462 | return -EINVAL; | |
1463 | } | |
0f420358 | 1464 | rdev->sb_start = sb_start; |
1da177e4 | 1465 | |
0002b271 N |
1466 | /* superblock is rarely larger than 1K, but it can be larger, |
1467 | * and it is safe to read 4k, so we do that | |
1468 | */ | |
1469 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1470 | if (ret) return ret; |
1471 | ||
1472 | ||
65a06f06 | 1473 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1474 | |
1475 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1476 | sb->major_version != cpu_to_le32(1) || | |
1477 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1478 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1479 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1480 | return -EINVAL; |
1481 | ||
1482 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1483 | printk("md: invalid superblock checksum on %s\n", | |
1484 | bdevname(rdev->bdev,b)); | |
1485 | return -EINVAL; | |
1486 | } | |
1487 | if (le64_to_cpu(sb->data_size) < 10) { | |
1488 | printk("md: data_size too small on %s\n", | |
1489 | bdevname(rdev->bdev,b)); | |
1490 | return -EINVAL; | |
1491 | } | |
c6563a8c N |
1492 | if (sb->pad0 || |
1493 | sb->pad3[0] || | |
1494 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1495 | /* Some padding is non-zero, might be a new feature */ | |
1496 | return -EINVAL; | |
e11e93fa | 1497 | |
1da177e4 LT |
1498 | rdev->preferred_minor = 0xffff; |
1499 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1500 | rdev->new_data_offset = rdev->data_offset; |
1501 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1502 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1503 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1504 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1505 | |
0002b271 | 1506 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1507 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1508 | if (rdev->sb_size & bmask) |
a1801f85 N |
1509 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1510 | ||
1511 | if (minor_version | |
0f420358 | 1512 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1513 | return -EINVAL; |
c6563a8c N |
1514 | if (minor_version |
1515 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1516 | return -EINVAL; | |
0002b271 | 1517 | |
31b65a0d N |
1518 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1519 | rdev->desc_nr = -1; | |
1520 | else | |
1521 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1522 | ||
2699b672 N |
1523 | if (!rdev->bb_page) { |
1524 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1525 | if (!rdev->bb_page) | |
1526 | return -ENOMEM; | |
1527 | } | |
1528 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1529 | rdev->badblocks.count == 0) { | |
1530 | /* need to load the bad block list. | |
1531 | * Currently we limit it to one page. | |
1532 | */ | |
1533 | s32 offset; | |
1534 | sector_t bb_sector; | |
1535 | u64 *bbp; | |
1536 | int i; | |
1537 | int sectors = le16_to_cpu(sb->bblog_size); | |
1538 | if (sectors > (PAGE_SIZE / 512)) | |
1539 | return -EINVAL; | |
1540 | offset = le32_to_cpu(sb->bblog_offset); | |
1541 | if (offset == 0) | |
1542 | return -EINVAL; | |
1543 | bb_sector = (long long)offset; | |
1544 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1545 | rdev->bb_page, READ, true)) | |
1546 | return -EIO; | |
1547 | bbp = (u64 *)page_address(rdev->bb_page); | |
1548 | rdev->badblocks.shift = sb->bblog_shift; | |
1549 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1550 | u64 bb = le64_to_cpu(*bbp); | |
1551 | int count = bb & (0x3ff); | |
1552 | u64 sector = bb >> 10; | |
1553 | sector <<= sb->bblog_shift; | |
1554 | count <<= sb->bblog_shift; | |
1555 | if (bb + 1 == 0) | |
1556 | break; | |
1557 | if (md_set_badblocks(&rdev->badblocks, | |
1558 | sector, count, 1) == 0) | |
1559 | return -EINVAL; | |
1560 | } | |
486adf72 N |
1561 | } else if (sb->bblog_offset != 0) |
1562 | rdev->badblocks.shift = 0; | |
2699b672 | 1563 | |
9a7b2b0f | 1564 | if (!refdev) { |
8ed75463 | 1565 | ret = 1; |
9a7b2b0f | 1566 | } else { |
1da177e4 | 1567 | __u64 ev1, ev2; |
65a06f06 | 1568 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1569 | |
1570 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1571 | sb->level != refsb->level || | |
1572 | sb->layout != refsb->layout || | |
1573 | sb->chunksize != refsb->chunksize) { | |
1574 | printk(KERN_WARNING "md: %s has strangely different" | |
1575 | " superblock to %s\n", | |
1576 | bdevname(rdev->bdev,b), | |
1577 | bdevname(refdev->bdev,b2)); | |
1578 | return -EINVAL; | |
1579 | } | |
1580 | ev1 = le64_to_cpu(sb->events); | |
1581 | ev2 = le64_to_cpu(refsb->events); | |
1582 | ||
1583 | if (ev1 > ev2) | |
8ed75463 N |
1584 | ret = 1; |
1585 | else | |
1586 | ret = 0; | |
1da177e4 | 1587 | } |
c6563a8c N |
1588 | if (minor_version) { |
1589 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1590 | sectors -= rdev->data_offset; | |
1591 | } else | |
1592 | sectors = rdev->sb_start; | |
1593 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1594 | return -EINVAL; |
dd8ac336 | 1595 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1596 | return ret; |
1da177e4 LT |
1597 | } |
1598 | ||
fd01b88c | 1599 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1600 | { |
65a06f06 | 1601 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1602 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1603 | |
41158c7e | 1604 | rdev->raid_disk = -1; |
c5d79adb N |
1605 | clear_bit(Faulty, &rdev->flags); |
1606 | clear_bit(In_sync, &rdev->flags); | |
1607 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1608 | |
1da177e4 LT |
1609 | if (mddev->raid_disks == 0) { |
1610 | mddev->major_version = 1; | |
1611 | mddev->patch_version = 0; | |
e691063a | 1612 | mddev->external = 0; |
9d8f0363 | 1613 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1614 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1615 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1616 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1617 | mddev->clevel[0] = 0; |
1da177e4 LT |
1618 | mddev->layout = le32_to_cpu(sb->layout); |
1619 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1620 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1621 | mddev->events = ev1; |
c3d9714e | 1622 | mddev->bitmap_info.offset = 0; |
6409bb05 N |
1623 | mddev->bitmap_info.space = 0; |
1624 | /* Default location for bitmap is 1K after superblock | |
1625 | * using 3K - total of 4K | |
1626 | */ | |
c3d9714e | 1627 | mddev->bitmap_info.default_offset = 1024 >> 9; |
6409bb05 | 1628 | mddev->bitmap_info.default_space = (4096-1024) >> 9; |
2c810cdd N |
1629 | mddev->reshape_backwards = 0; |
1630 | ||
1da177e4 LT |
1631 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1632 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1633 | ||
1634 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1635 | |
71c0805c | 1636 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
6409bb05 | 1637 | mddev->bitmap_info.file == NULL) { |
c3d9714e N |
1638 | mddev->bitmap_info.offset = |
1639 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
6409bb05 N |
1640 | /* Metadata doesn't record how much space is available. |
1641 | * For 1.0, we assume we can use up to the superblock | |
1642 | * if before, else to 4K beyond superblock. | |
1643 | * For others, assume no change is possible. | |
1644 | */ | |
1645 | if (mddev->minor_version > 0) | |
1646 | mddev->bitmap_info.space = 0; | |
1647 | else if (mddev->bitmap_info.offset > 0) | |
1648 | mddev->bitmap_info.space = | |
1649 | 8 - mddev->bitmap_info.offset; | |
1650 | else | |
1651 | mddev->bitmap_info.space = | |
1652 | -mddev->bitmap_info.offset; | |
1653 | } | |
e11e93fa | 1654 | |
f6705578 N |
1655 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1656 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1657 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1658 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1659 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1660 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1661 | if (mddev->delta_disks < 0 || |
1662 | (mddev->delta_disks == 0 && | |
1663 | (le32_to_cpu(sb->feature_map) | |
1664 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1665 | mddev->reshape_backwards = 1; | |
f6705578 N |
1666 | } else { |
1667 | mddev->reshape_position = MaxSector; | |
1668 | mddev->delta_disks = 0; | |
1669 | mddev->new_level = mddev->level; | |
1670 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1671 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1672 | } |
1673 | ||
41158c7e | 1674 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1675 | /* Insist of good event counter while assembling, except for |
1676 | * spares (which don't need an event count) */ | |
1da177e4 | 1677 | ++ev1; |
be6800a7 N |
1678 | if (rdev->desc_nr >= 0 && |
1679 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1680 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1681 | if (ev1 < mddev->events) | |
1682 | return -EINVAL; | |
41158c7e N |
1683 | } else if (mddev->bitmap) { |
1684 | /* If adding to array with a bitmap, then we can accept an | |
1685 | * older device, but not too old. | |
1686 | */ | |
41158c7e N |
1687 | if (ev1 < mddev->bitmap->events_cleared) |
1688 | return 0; | |
07d84d10 N |
1689 | } else { |
1690 | if (ev1 < mddev->events) | |
1691 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1692 | return 0; | |
1693 | } | |
1da177e4 LT |
1694 | if (mddev->level != LEVEL_MULTIPATH) { |
1695 | int role; | |
3673f305 N |
1696 | if (rdev->desc_nr < 0 || |
1697 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1698 | role = 0xffff; | |
1699 | rdev->desc_nr = -1; | |
1700 | } else | |
1701 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1702 | switch(role) { |
1703 | case 0xffff: /* spare */ | |
1da177e4 LT |
1704 | break; |
1705 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1706 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1707 | break; |
1708 | default: | |
5fd6c1dc N |
1709 | if ((le32_to_cpu(sb->feature_map) & |
1710 | MD_FEATURE_RECOVERY_OFFSET)) | |
1711 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1712 | else | |
1713 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1714 | rdev->raid_disk = role; |
1715 | break; | |
1716 | } | |
8ddf9efe N |
1717 | if (sb->devflags & WriteMostly1) |
1718 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1719 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1720 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1721 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1722 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1723 | |
1da177e4 LT |
1724 | return 0; |
1725 | } | |
1726 | ||
fd01b88c | 1727 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1728 | { |
1729 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1730 | struct md_rdev *rdev2; |
1da177e4 LT |
1731 | int max_dev, i; |
1732 | /* make rdev->sb match mddev and rdev data. */ | |
1733 | ||
65a06f06 | 1734 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1735 | |
1736 | sb->feature_map = 0; | |
1737 | sb->pad0 = 0; | |
5fd6c1dc | 1738 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1739 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1740 | ||
1741 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1742 | sb->events = cpu_to_le64(mddev->events); | |
1743 | if (mddev->in_sync) | |
1744 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1745 | else | |
1746 | sb->resync_offset = cpu_to_le64(0); | |
1747 | ||
1c05b4bc | 1748 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1749 | |
f0ca340c | 1750 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1751 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1752 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1753 | sb->level = cpu_to_le32(mddev->level); |
1754 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1755 | |
aeb9b211 N |
1756 | if (test_bit(WriteMostly, &rdev->flags)) |
1757 | sb->devflags |= WriteMostly1; | |
1758 | else | |
1759 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1760 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1761 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1762 | |
c3d9714e N |
1763 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1764 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1765 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1766 | } |
5fd6c1dc N |
1767 | |
1768 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1769 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1770 | sb->feature_map |= |
1771 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1772 | sb->recovery_offset = | |
1773 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc | 1774 | } |
2d78f8c4 N |
1775 | if (test_bit(Replacement, &rdev->flags)) |
1776 | sb->feature_map |= | |
1777 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1778 | |
f6705578 N |
1779 | if (mddev->reshape_position != MaxSector) { |
1780 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1781 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1782 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1783 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1784 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1785 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1786 | if (mddev->delta_disks == 0 && |
1787 | mddev->reshape_backwards) | |
1788 | sb->feature_map | |
1789 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1790 | if (rdev->new_data_offset != rdev->data_offset) { |
1791 | sb->feature_map | |
1792 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1793 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1794 | - rdev->data_offset)); | |
1795 | } | |
f6705578 | 1796 | } |
a654b9d8 | 1797 | |
2699b672 N |
1798 | if (rdev->badblocks.count == 0) |
1799 | /* Nothing to do for bad blocks*/ ; | |
1800 | else if (sb->bblog_offset == 0) | |
1801 | /* Cannot record bad blocks on this device */ | |
1802 | md_error(mddev, rdev); | |
1803 | else { | |
1804 | struct badblocks *bb = &rdev->badblocks; | |
1805 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1806 | u64 *p = bb->page; | |
1807 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1808 | if (bb->changed) { | |
1809 | unsigned seq; | |
1810 | ||
1811 | retry: | |
1812 | seq = read_seqbegin(&bb->lock); | |
1813 | ||
1814 | memset(bbp, 0xff, PAGE_SIZE); | |
1815 | ||
1816 | for (i = 0 ; i < bb->count ; i++) { | |
35f9ac2d | 1817 | u64 internal_bb = p[i]; |
2699b672 N |
1818 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) |
1819 | | BB_LEN(internal_bb)); | |
35f9ac2d | 1820 | bbp[i] = cpu_to_le64(store_bb); |
2699b672 | 1821 | } |
d0962936 | 1822 | bb->changed = 0; |
2699b672 N |
1823 | if (read_seqretry(&bb->lock, seq)) |
1824 | goto retry; | |
1825 | ||
1826 | bb->sector = (rdev->sb_start + | |
1827 | (int)le32_to_cpu(sb->bblog_offset)); | |
1828 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1829 | } |
1830 | } | |
1831 | ||
1da177e4 | 1832 | max_dev = 0; |
dafb20fa | 1833 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1834 | if (rdev2->desc_nr+1 > max_dev) |
1835 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1836 | |
70471daf N |
1837 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1838 | int bmask; | |
a778b73f | 1839 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1840 | rdev->sb_size = max_dev * 2 + 256; |
1841 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1842 | if (rdev->sb_size & bmask) | |
1843 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1844 | } else |
1845 | max_dev = le32_to_cpu(sb->max_dev); | |
1846 | ||
1da177e4 LT |
1847 | for (i=0; i<max_dev;i++) |
1848 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1849 | ||
dafb20fa | 1850 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1851 | i = rdev2->desc_nr; |
b2d444d7 | 1852 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1853 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1854 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1855 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1856 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1857 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1858 | else |
1859 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1860 | } | |
1861 | ||
1da177e4 LT |
1862 | sb->sb_csum = calc_sb_1_csum(sb); |
1863 | } | |
1864 | ||
0cd17fec | 1865 | static unsigned long long |
3cb03002 | 1866 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1867 | { |
1868 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1869 | sector_t max_sectors; |
58c0fed4 | 1870 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1871 | return 0; /* component must fit device */ |
c6563a8c N |
1872 | if (rdev->data_offset != rdev->new_data_offset) |
1873 | return 0; /* too confusing */ | |
0f420358 | 1874 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1875 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1876 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1877 | max_sectors -= rdev->data_offset; |
1878 | if (!num_sectors || num_sectors > max_sectors) | |
1879 | num_sectors = max_sectors; | |
c3d9714e | 1880 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1881 | /* minor version 0 with bitmap we can't move */ |
1882 | return 0; | |
1883 | } else { | |
1884 | /* minor version 0; superblock after data */ | |
0f420358 | 1885 | sector_t sb_start; |
77304d2a | 1886 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1887 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1888 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1889 | if (!num_sectors || num_sectors > max_sectors) |
1890 | num_sectors = max_sectors; | |
0f420358 | 1891 | rdev->sb_start = sb_start; |
0cd17fec | 1892 | } |
65a06f06 | 1893 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1894 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1895 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1896 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1897 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1898 | rdev->sb_page); |
1899 | md_super_wait(rdev->mddev); | |
c26a44ed | 1900 | return num_sectors; |
c6563a8c N |
1901 | |
1902 | } | |
1903 | ||
1904 | static int | |
1905 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1906 | unsigned long long new_offset) | |
1907 | { | |
1908 | /* All necessary checks on new >= old have been done */ | |
1909 | struct bitmap *bitmap; | |
1910 | if (new_offset >= rdev->data_offset) | |
1911 | return 1; | |
1912 | ||
1913 | /* with 1.0 metadata, there is no metadata to tread on | |
1914 | * so we can always move back */ | |
1915 | if (rdev->mddev->minor_version == 0) | |
1916 | return 1; | |
1917 | ||
1918 | /* otherwise we must be sure not to step on | |
1919 | * any metadata, so stay: | |
1920 | * 36K beyond start of superblock | |
1921 | * beyond end of badblocks | |
1922 | * beyond write-intent bitmap | |
1923 | */ | |
1924 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1925 | return 0; | |
1926 | bitmap = rdev->mddev->bitmap; | |
1927 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1928 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1ec885cd | 1929 | bitmap->storage.file_pages * (PAGE_SIZE>>9) > new_offset) |
c6563a8c N |
1930 | return 0; |
1931 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1932 | return 0; | |
1933 | ||
1934 | return 1; | |
0cd17fec | 1935 | } |
1da177e4 | 1936 | |
75c96f85 | 1937 | static struct super_type super_types[] = { |
1da177e4 LT |
1938 | [0] = { |
1939 | .name = "0.90.0", | |
1940 | .owner = THIS_MODULE, | |
0cd17fec CW |
1941 | .load_super = super_90_load, |
1942 | .validate_super = super_90_validate, | |
1943 | .sync_super = super_90_sync, | |
1944 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1945 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1946 | }, |
1947 | [1] = { | |
1948 | .name = "md-1", | |
1949 | .owner = THIS_MODULE, | |
0cd17fec CW |
1950 | .load_super = super_1_load, |
1951 | .validate_super = super_1_validate, | |
1952 | .sync_super = super_1_sync, | |
1953 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1954 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1955 | }, |
1956 | }; | |
1da177e4 | 1957 | |
fd01b88c | 1958 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1959 | { |
1960 | if (mddev->sync_super) { | |
1961 | mddev->sync_super(mddev, rdev); | |
1962 | return; | |
1963 | } | |
1964 | ||
1965 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1966 | ||
1967 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1968 | } | |
1969 | ||
fd01b88c | 1970 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1971 | { |
3cb03002 | 1972 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1973 | |
4b80991c N |
1974 | rcu_read_lock(); |
1975 | rdev_for_each_rcu(rdev, mddev1) | |
1976 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1977 | if (rdev->bdev->bd_contains == |
4b80991c N |
1978 | rdev2->bdev->bd_contains) { |
1979 | rcu_read_unlock(); | |
7dd5e7c3 | 1980 | return 1; |
4b80991c N |
1981 | } |
1982 | rcu_read_unlock(); | |
1da177e4 LT |
1983 | return 0; |
1984 | } | |
1985 | ||
1986 | static LIST_HEAD(pending_raid_disks); | |
1987 | ||
ac5e7113 AN |
1988 | /* |
1989 | * Try to register data integrity profile for an mddev | |
1990 | * | |
1991 | * This is called when an array is started and after a disk has been kicked | |
1992 | * from the array. It only succeeds if all working and active component devices | |
1993 | * are integrity capable with matching profiles. | |
1994 | */ | |
fd01b88c | 1995 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1996 | { |
3cb03002 | 1997 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1998 | |
1999 | if (list_empty(&mddev->disks)) | |
2000 | return 0; /* nothing to do */ | |
629acb6a JB |
2001 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
2002 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 2003 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
2004 | /* skip spares and non-functional disks */ |
2005 | if (test_bit(Faulty, &rdev->flags)) | |
2006 | continue; | |
2007 | if (rdev->raid_disk < 0) | |
2008 | continue; | |
ac5e7113 AN |
2009 | if (!reference) { |
2010 | /* Use the first rdev as the reference */ | |
2011 | reference = rdev; | |
2012 | continue; | |
2013 | } | |
2014 | /* does this rdev's profile match the reference profile? */ | |
2015 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
2016 | rdev->bdev->bd_disk) < 0) | |
2017 | return -EINVAL; | |
2018 | } | |
89078d57 MP |
2019 | if (!reference || !bdev_get_integrity(reference->bdev)) |
2020 | return 0; | |
ac5e7113 AN |
2021 | /* |
2022 | * All component devices are integrity capable and have matching | |
2023 | * profiles, register the common profile for the md device. | |
2024 | */ | |
2025 | if (blk_integrity_register(mddev->gendisk, | |
2026 | bdev_get_integrity(reference->bdev)) != 0) { | |
2027 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
2028 | mdname(mddev)); | |
2029 | return -EINVAL; | |
2030 | } | |
a91a2785 MP |
2031 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
2032 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
2033 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
2034 | mdname(mddev)); | |
2035 | return -EINVAL; | |
2036 | } | |
ac5e7113 AN |
2037 | return 0; |
2038 | } | |
2039 | EXPORT_SYMBOL(md_integrity_register); | |
2040 | ||
2041 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 2042 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 2043 | { |
2863b9eb JB |
2044 | struct blk_integrity *bi_rdev; |
2045 | struct blk_integrity *bi_mddev; | |
2046 | ||
2047 | if (!mddev->gendisk) | |
2048 | return; | |
2049 | ||
2050 | bi_rdev = bdev_get_integrity(rdev->bdev); | |
2051 | bi_mddev = blk_get_integrity(mddev->gendisk); | |
3f9d99c1 | 2052 | |
ac5e7113 | 2053 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 2054 | return; |
ac5e7113 | 2055 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 2056 | return; |
ac5e7113 AN |
2057 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2058 | rdev->bdev->bd_disk) >= 0) | |
2059 | return; | |
2060 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2061 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2062 | } |
ac5e7113 | 2063 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2064 | |
fd01b88c | 2065 | static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev) |
1da177e4 | 2066 | { |
7dd5e7c3 | 2067 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2068 | struct kobject *ko; |
1edf80d3 | 2069 | char *s; |
5e55e2f5 | 2070 | int err; |
1da177e4 LT |
2071 | |
2072 | if (rdev->mddev) { | |
2073 | MD_BUG(); | |
2074 | return -EINVAL; | |
2075 | } | |
11e2ede0 DW |
2076 | |
2077 | /* prevent duplicates */ | |
2078 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2079 | return -EEXIST; | |
2080 | ||
dd8ac336 AN |
2081 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2082 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2083 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2084 | if (mddev->pers) { |
2085 | /* Cannot change size, so fail | |
2086 | * If mddev->level <= 0, then we don't care | |
2087 | * about aligning sizes (e.g. linear) | |
2088 | */ | |
2089 | if (mddev->level > 0) | |
2090 | return -ENOSPC; | |
2091 | } else | |
dd8ac336 | 2092 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2093 | } |
1da177e4 LT |
2094 | |
2095 | /* Verify rdev->desc_nr is unique. | |
2096 | * If it is -1, assign a free number, else | |
2097 | * check number is not in use | |
2098 | */ | |
2099 | if (rdev->desc_nr < 0) { | |
2100 | int choice = 0; | |
2101 | if (mddev->pers) choice = mddev->raid_disks; | |
2102 | while (find_rdev_nr(mddev, choice)) | |
2103 | choice++; | |
2104 | rdev->desc_nr = choice; | |
2105 | } else { | |
2106 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
2107 | return -EBUSY; | |
2108 | } | |
de01dfad N |
2109 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2110 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2111 | mdname(mddev), mddev->max_disks); | |
2112 | return -EBUSY; | |
2113 | } | |
19133a42 | 2114 | bdevname(rdev->bdev,b); |
649316b2 | 2115 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2116 | *s = '!'; |
649316b2 | 2117 | |
1da177e4 | 2118 | rdev->mddev = mddev; |
19133a42 | 2119 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2120 | |
b2d6db58 | 2121 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2122 | goto fail; |
86e6ffdd | 2123 | |
0762b8bd | 2124 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2125 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2126 | /* failure here is OK */; | |
2127 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2128 | |
4b80991c | 2129 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2130 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2131 | |
2132 | /* May as well allow recovery to be retried once */ | |
5389042f | 2133 | mddev->recovery_disabled++; |
3f9d99c1 | 2134 | |
1da177e4 | 2135 | return 0; |
5e55e2f5 N |
2136 | |
2137 | fail: | |
2138 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2139 | b, mdname(mddev)); | |
2140 | return err; | |
1da177e4 LT |
2141 | } |
2142 | ||
177a99b2 | 2143 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2144 | { |
3cb03002 | 2145 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2146 | kobject_del(&rdev->kobj); |
177a99b2 | 2147 | kobject_put(&rdev->kobj); |
5792a285 N |
2148 | } |
2149 | ||
3cb03002 | 2150 | static void unbind_rdev_from_array(struct md_rdev * rdev) |
1da177e4 LT |
2151 | { |
2152 | char b[BDEVNAME_SIZE]; | |
2153 | if (!rdev->mddev) { | |
2154 | MD_BUG(); | |
2155 | return; | |
2156 | } | |
49731baa | 2157 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2158 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2159 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2160 | rdev->mddev = NULL; | |
86e6ffdd | 2161 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2162 | sysfs_put(rdev->sysfs_state); |
2163 | rdev->sysfs_state = NULL; | |
2230dfe4 | 2164 | rdev->badblocks.count = 0; |
5792a285 | 2165 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2166 | * writing to 'remove' to "dev/state". We also need |
2167 | * to delay it due to rcu usage. | |
5792a285 | 2168 | */ |
4b80991c | 2169 | synchronize_rcu(); |
177a99b2 N |
2170 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2171 | kobject_get(&rdev->kobj); | |
e804ac78 | 2172 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2173 | } |
2174 | ||
2175 | /* | |
2176 | * prevent the device from being mounted, repartitioned or | |
2177 | * otherwise reused by a RAID array (or any other kernel | |
2178 | * subsystem), by bd_claiming the device. | |
2179 | */ | |
3cb03002 | 2180 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2181 | { |
2182 | int err = 0; | |
2183 | struct block_device *bdev; | |
2184 | char b[BDEVNAME_SIZE]; | |
2185 | ||
d4d77629 | 2186 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2187 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2188 | if (IS_ERR(bdev)) { |
2189 | printk(KERN_ERR "md: could not open %s.\n", | |
2190 | __bdevname(dev, b)); | |
2191 | return PTR_ERR(bdev); | |
2192 | } | |
1da177e4 LT |
2193 | rdev->bdev = bdev; |
2194 | return err; | |
2195 | } | |
2196 | ||
3cb03002 | 2197 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2198 | { |
2199 | struct block_device *bdev = rdev->bdev; | |
2200 | rdev->bdev = NULL; | |
2201 | if (!bdev) | |
2202 | MD_BUG(); | |
e525fd89 | 2203 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2204 | } |
2205 | ||
2206 | void md_autodetect_dev(dev_t dev); | |
2207 | ||
3cb03002 | 2208 | static void export_rdev(struct md_rdev * rdev) |
1da177e4 LT |
2209 | { |
2210 | char b[BDEVNAME_SIZE]; | |
2211 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
2212 | bdevname(rdev->bdev,b)); | |
2213 | if (rdev->mddev) | |
2214 | MD_BUG(); | |
545c8795 | 2215 | md_rdev_clear(rdev); |
1da177e4 | 2216 | #ifndef MODULE |
d0fae18f N |
2217 | if (test_bit(AutoDetected, &rdev->flags)) |
2218 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2219 | #endif |
2220 | unlock_rdev(rdev); | |
86e6ffdd | 2221 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2222 | } |
2223 | ||
3cb03002 | 2224 | static void kick_rdev_from_array(struct md_rdev * rdev) |
1da177e4 LT |
2225 | { |
2226 | unbind_rdev_from_array(rdev); | |
2227 | export_rdev(rdev); | |
2228 | } | |
2229 | ||
fd01b88c | 2230 | static void export_array(struct mddev *mddev) |
1da177e4 | 2231 | { |
3cb03002 | 2232 | struct md_rdev *rdev, *tmp; |
1da177e4 | 2233 | |
dafb20fa | 2234 | rdev_for_each_safe(rdev, tmp, mddev) { |
1da177e4 LT |
2235 | if (!rdev->mddev) { |
2236 | MD_BUG(); | |
2237 | continue; | |
2238 | } | |
2239 | kick_rdev_from_array(rdev); | |
2240 | } | |
2241 | if (!list_empty(&mddev->disks)) | |
2242 | MD_BUG(); | |
2243 | mddev->raid_disks = 0; | |
2244 | mddev->major_version = 0; | |
2245 | } | |
2246 | ||
2247 | static void print_desc(mdp_disk_t *desc) | |
2248 | { | |
2249 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2250 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2251 | } | |
2252 | ||
cd2ac932 | 2253 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2254 | { |
2255 | int i; | |
2256 | ||
2257 | printk(KERN_INFO | |
2258 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2259 | sb->major_version, sb->minor_version, sb->patch_version, | |
2260 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2261 | sb->ctime); | |
2262 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2263 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2264 | sb->md_minor, sb->layout, sb->chunk_size); | |
2265 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2266 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2267 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2268 | sb->failed_disks, sb->spare_disks, | |
2269 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2270 | ||
2271 | printk(KERN_INFO); | |
2272 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2273 | mdp_disk_t *desc; | |
2274 | ||
2275 | desc = sb->disks + i; | |
2276 | if (desc->number || desc->major || desc->minor || | |
2277 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2278 | printk(" D %2d: ", i); | |
2279 | print_desc(desc); | |
2280 | } | |
2281 | } | |
2282 | printk(KERN_INFO "md: THIS: "); | |
2283 | print_desc(&sb->this_disk); | |
cd2ac932 | 2284 | } |
1da177e4 | 2285 | |
cd2ac932 CR |
2286 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2287 | { | |
2288 | __u8 *uuid; | |
2289 | ||
2290 | uuid = sb->set_uuid; | |
ad361c98 | 2291 | printk(KERN_INFO |
7b75c2f8 | 2292 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2293 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2294 | le32_to_cpu(sb->major_version), |
2295 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2296 | uuid, |
cd2ac932 CR |
2297 | sb->set_name, |
2298 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2299 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2300 | ||
2301 | uuid = sb->device_uuid; | |
ad361c98 JP |
2302 | printk(KERN_INFO |
2303 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2304 | " RO:%llu\n" |
7b75c2f8 | 2305 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2306 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2307 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2308 | le32_to_cpu(sb->level), |
2309 | (unsigned long long)le64_to_cpu(sb->size), | |
2310 | le32_to_cpu(sb->raid_disks), | |
2311 | le32_to_cpu(sb->layout), | |
2312 | le32_to_cpu(sb->chunksize), | |
2313 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2314 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2315 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2316 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2317 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2318 | uuid, |
cd2ac932 CR |
2319 | sb->devflags, |
2320 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2321 | (unsigned long long)le64_to_cpu(sb->events), | |
2322 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2323 | le32_to_cpu(sb->sb_csum), | |
2324 | le32_to_cpu(sb->max_dev) | |
2325 | ); | |
1da177e4 LT |
2326 | } |
2327 | ||
3cb03002 | 2328 | static void print_rdev(struct md_rdev *rdev, int major_version) |
1da177e4 LT |
2329 | { |
2330 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2331 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2332 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2333 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2334 | rdev->desc_nr); | |
1da177e4 | 2335 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2336 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2337 | switch (major_version) { | |
2338 | case 0: | |
65a06f06 | 2339 | print_sb_90(page_address(rdev->sb_page)); |
cd2ac932 CR |
2340 | break; |
2341 | case 1: | |
65a06f06 | 2342 | print_sb_1(page_address(rdev->sb_page)); |
cd2ac932 CR |
2343 | break; |
2344 | } | |
1da177e4 LT |
2345 | } else |
2346 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2347 | } | |
2348 | ||
5e56341d | 2349 | static void md_print_devices(void) |
1da177e4 | 2350 | { |
159ec1fc | 2351 | struct list_head *tmp; |
3cb03002 | 2352 | struct md_rdev *rdev; |
fd01b88c | 2353 | struct mddev *mddev; |
1da177e4 LT |
2354 | char b[BDEVNAME_SIZE]; |
2355 | ||
2356 | printk("\n"); | |
2357 | printk("md: **********************************\n"); | |
2358 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2359 | printk("md: **********************************\n"); | |
29ac4aa3 | 2360 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2361 | |
32a7627c N |
2362 | if (mddev->bitmap) |
2363 | bitmap_print_sb(mddev->bitmap); | |
2364 | else | |
2365 | printk("%s: ", mdname(mddev)); | |
dafb20fa | 2366 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
2367 | printk("<%s>", bdevname(rdev->bdev,b)); |
2368 | printk("\n"); | |
2369 | ||
dafb20fa | 2370 | rdev_for_each(rdev, mddev) |
cd2ac932 | 2371 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2372 | } |
2373 | printk("md: **********************************\n"); | |
2374 | printk("\n"); | |
2375 | } | |
2376 | ||
2377 | ||
fd01b88c | 2378 | static void sync_sbs(struct mddev * mddev, int nospares) |
1da177e4 | 2379 | { |
42543769 N |
2380 | /* Update each superblock (in-memory image), but |
2381 | * if we are allowed to, skip spares which already | |
2382 | * have the right event counter, or have one earlier | |
2383 | * (which would mean they aren't being marked as dirty | |
2384 | * with the rest of the array) | |
2385 | */ | |
3cb03002 | 2386 | struct md_rdev *rdev; |
dafb20fa | 2387 | rdev_for_each(rdev, mddev) { |
42543769 N |
2388 | if (rdev->sb_events == mddev->events || |
2389 | (nospares && | |
2390 | rdev->raid_disk < 0 && | |
42543769 N |
2391 | rdev->sb_events+1 == mddev->events)) { |
2392 | /* Don't update this superblock */ | |
2393 | rdev->sb_loaded = 2; | |
2394 | } else { | |
076f968b | 2395 | sync_super(mddev, rdev); |
42543769 N |
2396 | rdev->sb_loaded = 1; |
2397 | } | |
1da177e4 LT |
2398 | } |
2399 | } | |
2400 | ||
fd01b88c | 2401 | static void md_update_sb(struct mddev * mddev, int force_change) |
1da177e4 | 2402 | { |
3cb03002 | 2403 | struct md_rdev *rdev; |
06d91a5f | 2404 | int sync_req; |
42543769 | 2405 | int nospares = 0; |
2699b672 | 2406 | int any_badblocks_changed = 0; |
1da177e4 | 2407 | |
d87f064f N |
2408 | if (mddev->ro) { |
2409 | if (force_change) | |
2410 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2411 | return; | |
2412 | } | |
1da177e4 | 2413 | repeat: |
3a3a5ddb | 2414 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2415 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2416 | if (rdev->raid_disk >= 0 && |
2417 | mddev->delta_disks >= 0 && | |
2418 | !test_bit(In_sync, &rdev->flags) && | |
2419 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2420 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2421 | ||
2422 | } | |
bd52b746 | 2423 | if (!mddev->persistent) { |
070dc6dd | 2424 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2425 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2426 | if (!mddev->external) { |
d97a41dc | 2427 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2428 | rdev_for_each(rdev, mddev) { |
de393cde | 2429 | if (rdev->badblocks.changed) { |
d0962936 | 2430 | rdev->badblocks.changed = 0; |
de393cde N |
2431 | md_ack_all_badblocks(&rdev->badblocks); |
2432 | md_error(mddev, rdev); | |
2433 | } | |
2434 | clear_bit(Blocked, &rdev->flags); | |
2435 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2436 | wake_up(&rdev->blocked_wait); | |
2437 | } | |
2438 | } | |
3a3a5ddb N |
2439 | wake_up(&mddev->sb_wait); |
2440 | return; | |
2441 | } | |
2442 | ||
a9701a30 | 2443 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2444 | |
3a3a5ddb N |
2445 | mddev->utime = get_seconds(); |
2446 | ||
850b2b42 N |
2447 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2448 | force_change = 1; | |
2449 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2450 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2451 | * though if events isn't the right even/odd, we will have to do | |
2452 | * spares after all | |
2453 | */ | |
2454 | nospares = 1; | |
2455 | if (force_change) | |
2456 | nospares = 0; | |
2457 | if (mddev->degraded) | |
84692195 N |
2458 | /* If the array is degraded, then skipping spares is both |
2459 | * dangerous and fairly pointless. | |
2460 | * Dangerous because a device that was removed from the array | |
2461 | * might have a event_count that still looks up-to-date, | |
2462 | * so it can be re-added without a resync. | |
2463 | * Pointless because if there are any spares to skip, | |
2464 | * then a recovery will happen and soon that array won't | |
2465 | * be degraded any more and the spare can go back to sleep then. | |
2466 | */ | |
850b2b42 | 2467 | nospares = 0; |
84692195 | 2468 | |
06d91a5f | 2469 | sync_req = mddev->in_sync; |
42543769 N |
2470 | |
2471 | /* If this is just a dirty<->clean transition, and the array is clean | |
2472 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2473 | if (nospares |
42543769 | 2474 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2475 | && mddev->can_decrease_events |
2476 | && mddev->events != 1) { | |
42543769 | 2477 | mddev->events--; |
a8707c08 N |
2478 | mddev->can_decrease_events = 0; |
2479 | } else { | |
42543769 N |
2480 | /* otherwise we have to go forward and ... */ |
2481 | mddev->events ++; | |
a8707c08 | 2482 | mddev->can_decrease_events = nospares; |
42543769 | 2483 | } |
1da177e4 LT |
2484 | |
2485 | if (!mddev->events) { | |
2486 | /* | |
2487 | * oops, this 64-bit counter should never wrap. | |
2488 | * Either we are in around ~1 trillion A.C., assuming | |
2489 | * 1 reboot per second, or we have a bug: | |
2490 | */ | |
2491 | MD_BUG(); | |
2492 | mddev->events --; | |
2493 | } | |
2699b672 | 2494 | |
dafb20fa | 2495 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2496 | if (rdev->badblocks.changed) |
2497 | any_badblocks_changed++; | |
de393cde N |
2498 | if (test_bit(Faulty, &rdev->flags)) |
2499 | set_bit(FaultRecorded, &rdev->flags); | |
2500 | } | |
2699b672 | 2501 | |
e691063a | 2502 | sync_sbs(mddev, nospares); |
a9701a30 | 2503 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 | 2504 | |
36a4e1fe N |
2505 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2506 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2507 | |
4ad13663 | 2508 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2509 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2510 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2511 | |
42543769 N |
2512 | if (rdev->sb_loaded != 1) |
2513 | continue; /* no noise on spare devices */ | |
1da177e4 | 2514 | |
d70ed2e4 AW |
2515 | if (!test_bit(Faulty, &rdev->flags) && |
2516 | rdev->saved_raid_disk == -1) { | |
7bfa19f2 | 2517 | md_super_write(mddev,rdev, |
0f420358 | 2518 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2519 | rdev->sb_page); |
36a4e1fe N |
2520 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2521 | bdevname(rdev->bdev, b), | |
2522 | (unsigned long long)rdev->sb_start); | |
42543769 | 2523 | rdev->sb_events = mddev->events; |
2699b672 N |
2524 | if (rdev->badblocks.size) { |
2525 | md_super_write(mddev, rdev, | |
2526 | rdev->badblocks.sector, | |
2527 | rdev->badblocks.size << 9, | |
2528 | rdev->bb_page); | |
2529 | rdev->badblocks.size = 0; | |
2530 | } | |
7bfa19f2 | 2531 | |
d70ed2e4 | 2532 | } else if (test_bit(Faulty, &rdev->flags)) |
36a4e1fe N |
2533 | pr_debug("md: %s (skipping faulty)\n", |
2534 | bdevname(rdev->bdev, b)); | |
d70ed2e4 AW |
2535 | else |
2536 | pr_debug("(skipping incremental s/r "); | |
2537 | ||
7bfa19f2 | 2538 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2539 | /* only need to write one superblock... */ |
2540 | break; | |
2541 | } | |
a9701a30 | 2542 | md_super_wait(mddev); |
850b2b42 | 2543 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2544 | |
a9701a30 | 2545 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2546 | if (mddev->in_sync != sync_req || |
2547 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2548 | /* have to write it out again */ |
a9701a30 | 2549 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2550 | goto repeat; |
2551 | } | |
850b2b42 | 2552 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2553 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2554 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2555 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2556 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2557 | |
dafb20fa | 2558 | rdev_for_each(rdev, mddev) { |
de393cde N |
2559 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2560 | clear_bit(Blocked, &rdev->flags); | |
2561 | ||
2562 | if (any_badblocks_changed) | |
2699b672 | 2563 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2564 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2565 | wake_up(&rdev->blocked_wait); | |
2566 | } | |
1da177e4 LT |
2567 | } |
2568 | ||
7f6ce769 | 2569 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2570 | * We want to accept with case. For this we use cmd_match. |
2571 | */ | |
2572 | static int cmd_match(const char *cmd, const char *str) | |
2573 | { | |
2574 | /* See if cmd, written into a sysfs file, matches | |
2575 | * str. They must either be the same, or cmd can | |
2576 | * have a trailing newline | |
2577 | */ | |
2578 | while (*cmd && *str && *cmd == *str) { | |
2579 | cmd++; | |
2580 | str++; | |
2581 | } | |
2582 | if (*cmd == '\n') | |
2583 | cmd++; | |
2584 | if (*str || *cmd) | |
2585 | return 0; | |
2586 | return 1; | |
2587 | } | |
2588 | ||
86e6ffdd N |
2589 | struct rdev_sysfs_entry { |
2590 | struct attribute attr; | |
3cb03002 N |
2591 | ssize_t (*show)(struct md_rdev *, char *); |
2592 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2593 | }; |
2594 | ||
2595 | static ssize_t | |
3cb03002 | 2596 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2597 | { |
2598 | char *sep = ""; | |
20a49ff6 | 2599 | size_t len = 0; |
86e6ffdd | 2600 | |
de393cde N |
2601 | if (test_bit(Faulty, &rdev->flags) || |
2602 | rdev->badblocks.unacked_exist) { | |
86e6ffdd N |
2603 | len+= sprintf(page+len, "%sfaulty",sep); |
2604 | sep = ","; | |
2605 | } | |
b2d444d7 | 2606 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2607 | len += sprintf(page+len, "%sin_sync",sep); |
2608 | sep = ","; | |
2609 | } | |
f655675b N |
2610 | if (test_bit(WriteMostly, &rdev->flags)) { |
2611 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2612 | sep = ","; | |
2613 | } | |
de393cde | 2614 | if (test_bit(Blocked, &rdev->flags) || |
52c64152 N |
2615 | (rdev->badblocks.unacked_exist |
2616 | && !test_bit(Faulty, &rdev->flags))) { | |
6bfe0b49 DW |
2617 | len += sprintf(page+len, "%sblocked", sep); |
2618 | sep = ","; | |
2619 | } | |
b2d444d7 N |
2620 | if (!test_bit(Faulty, &rdev->flags) && |
2621 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2622 | len += sprintf(page+len, "%sspare", sep); |
2623 | sep = ","; | |
2624 | } | |
d7a9d443 N |
2625 | if (test_bit(WriteErrorSeen, &rdev->flags)) { |
2626 | len += sprintf(page+len, "%swrite_error", sep); | |
2627 | sep = ","; | |
2628 | } | |
2d78f8c4 N |
2629 | if (test_bit(WantReplacement, &rdev->flags)) { |
2630 | len += sprintf(page+len, "%swant_replacement", sep); | |
2631 | sep = ","; | |
2632 | } | |
2633 | if (test_bit(Replacement, &rdev->flags)) { | |
2634 | len += sprintf(page+len, "%sreplacement", sep); | |
2635 | sep = ","; | |
2636 | } | |
2637 | ||
86e6ffdd N |
2638 | return len+sprintf(page+len, "\n"); |
2639 | } | |
2640 | ||
45dc2de1 | 2641 | static ssize_t |
3cb03002 | 2642 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2643 | { |
2644 | /* can write | |
de393cde | 2645 | * faulty - simulates an error |
45dc2de1 | 2646 | * remove - disconnects the device |
f655675b N |
2647 | * writemostly - sets write_mostly |
2648 | * -writemostly - clears write_mostly | |
de393cde N |
2649 | * blocked - sets the Blocked flags |
2650 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2651 | * insync - sets Insync providing device isn't active |
d7a9d443 N |
2652 | * write_error - sets WriteErrorSeen |
2653 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2654 | */ |
2655 | int err = -EINVAL; | |
2656 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2657 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2658 | if (test_bit(Faulty, &rdev->flags)) |
2659 | err = 0; | |
2660 | else | |
2661 | err = -EBUSY; | |
45dc2de1 N |
2662 | } else if (cmd_match(buf, "remove")) { |
2663 | if (rdev->raid_disk >= 0) | |
2664 | err = -EBUSY; | |
2665 | else { | |
fd01b88c | 2666 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2667 | kick_rdev_from_array(rdev); |
3f9d7b0d N |
2668 | if (mddev->pers) |
2669 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2670 | md_new_event(mddev); |
2671 | err = 0; | |
2672 | } | |
f655675b N |
2673 | } else if (cmd_match(buf, "writemostly")) { |
2674 | set_bit(WriteMostly, &rdev->flags); | |
2675 | err = 0; | |
2676 | } else if (cmd_match(buf, "-writemostly")) { | |
2677 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2678 | err = 0; |
2679 | } else if (cmd_match(buf, "blocked")) { | |
2680 | set_bit(Blocked, &rdev->flags); | |
2681 | err = 0; | |
2682 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2683 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2684 | rdev->badblocks.unacked_exist) { |
de393cde N |
2685 | /* metadata handler doesn't understand badblocks, |
2686 | * so we need to fail the device | |
2687 | */ | |
2688 | md_error(rdev->mddev, rdev); | |
2689 | } | |
6bfe0b49 | 2690 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2691 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2692 | wake_up(&rdev->blocked_wait); |
2693 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2694 | md_wakeup_thread(rdev->mddev->thread); | |
2695 | ||
6d56e278 N |
2696 | err = 0; |
2697 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2698 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2699 | err = 0; |
d7a9d443 N |
2700 | } else if (cmd_match(buf, "write_error")) { |
2701 | set_bit(WriteErrorSeen, &rdev->flags); | |
2702 | err = 0; | |
2703 | } else if (cmd_match(buf, "-write_error")) { | |
2704 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2705 | err = 0; | |
2d78f8c4 N |
2706 | } else if (cmd_match(buf, "want_replacement")) { |
2707 | /* Any non-spare device that is not a replacement can | |
2708 | * become want_replacement at any time, but we then need to | |
2709 | * check if recovery is needed. | |
2710 | */ | |
2711 | if (rdev->raid_disk >= 0 && | |
2712 | !test_bit(Replacement, &rdev->flags)) | |
2713 | set_bit(WantReplacement, &rdev->flags); | |
2714 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2715 | md_wakeup_thread(rdev->mddev->thread); | |
2716 | err = 0; | |
2717 | } else if (cmd_match(buf, "-want_replacement")) { | |
2718 | /* Clearing 'want_replacement' is always allowed. | |
2719 | * Once replacements starts it is too late though. | |
2720 | */ | |
2721 | err = 0; | |
2722 | clear_bit(WantReplacement, &rdev->flags); | |
2723 | } else if (cmd_match(buf, "replacement")) { | |
2724 | /* Can only set a device as a replacement when array has not | |
2725 | * yet been started. Once running, replacement is automatic | |
2726 | * from spares, or by assigning 'slot'. | |
2727 | */ | |
2728 | if (rdev->mddev->pers) | |
2729 | err = -EBUSY; | |
2730 | else { | |
2731 | set_bit(Replacement, &rdev->flags); | |
2732 | err = 0; | |
2733 | } | |
2734 | } else if (cmd_match(buf, "-replacement")) { | |
2735 | /* Similarly, can only clear Replacement before start */ | |
2736 | if (rdev->mddev->pers) | |
2737 | err = -EBUSY; | |
2738 | else { | |
2739 | clear_bit(Replacement, &rdev->flags); | |
2740 | err = 0; | |
2741 | } | |
45dc2de1 | 2742 | } |
00bcb4ac N |
2743 | if (!err) |
2744 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2745 | return err ? err : len; |
2746 | } | |
80ca3a44 N |
2747 | static struct rdev_sysfs_entry rdev_state = |
2748 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2749 | |
4dbcdc75 | 2750 | static ssize_t |
3cb03002 | 2751 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2752 | { |
2753 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2754 | } | |
2755 | ||
2756 | static ssize_t | |
3cb03002 | 2757 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 N |
2758 | { |
2759 | char *e; | |
2760 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2761 | if (*buf && (*e == 0 || *e == '\n')) { | |
2762 | atomic_set(&rdev->corrected_errors, n); | |
2763 | return len; | |
2764 | } | |
2765 | return -EINVAL; | |
2766 | } | |
2767 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2768 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2769 | |
014236d2 | 2770 | static ssize_t |
3cb03002 | 2771 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2772 | { |
2773 | if (rdev->raid_disk < 0) | |
2774 | return sprintf(page, "none\n"); | |
2775 | else | |
2776 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2777 | } | |
2778 | ||
2779 | static ssize_t | |
3cb03002 | 2780 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 N |
2781 | { |
2782 | char *e; | |
c303da6d | 2783 | int err; |
014236d2 N |
2784 | int slot = simple_strtoul(buf, &e, 10); |
2785 | if (strncmp(buf, "none", 4)==0) | |
2786 | slot = -1; | |
2787 | else if (e==buf || (*e && *e!= '\n')) | |
2788 | return -EINVAL; | |
6c2fce2e | 2789 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2790 | /* Setting 'slot' on an active array requires also |
2791 | * updating the 'rd%d' link, and communicating | |
2792 | * with the personality with ->hot_*_disk. | |
2793 | * For now we only support removing | |
2794 | * failed/spare devices. This normally happens automatically, | |
2795 | * but not when the metadata is externally managed. | |
2796 | */ | |
c303da6d N |
2797 | if (rdev->raid_disk == -1) |
2798 | return -EEXIST; | |
2799 | /* personality does all needed checks */ | |
01393f3d | 2800 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d | 2801 | return -EINVAL; |
746d3207 N |
2802 | clear_bit(Blocked, &rdev->flags); |
2803 | remove_and_add_spares(rdev->mddev, rdev); | |
2804 | if (rdev->raid_disk >= 0) | |
2805 | return -EBUSY; | |
c303da6d N |
2806 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2807 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2808 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2809 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2810 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2811 | */ |
2812 | ||
2813 | if (rdev->raid_disk != -1) | |
2814 | return -EBUSY; | |
2815 | ||
c6751b2b N |
2816 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2817 | return -EBUSY; | |
2818 | ||
6c2fce2e NB |
2819 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2820 | return -EINVAL; | |
2821 | ||
ba1b41b6 N |
2822 | if (slot >= rdev->mddev->raid_disks && |
2823 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2824 | return -ENOSPC; | |
2825 | ||
6c2fce2e NB |
2826 | rdev->raid_disk = slot; |
2827 | if (test_bit(In_sync, &rdev->flags)) | |
2828 | rdev->saved_raid_disk = slot; | |
2829 | else | |
2830 | rdev->saved_raid_disk = -1; | |
d30519fc | 2831 | clear_bit(In_sync, &rdev->flags); |
6c2fce2e NB |
2832 | err = rdev->mddev->pers-> |
2833 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2834 | if (err) { |
6c2fce2e | 2835 | rdev->raid_disk = -1; |
6c2fce2e | 2836 | return err; |
52664732 | 2837 | } else |
00bcb4ac | 2838 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2839 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2840 | /* failure here is OK */; |
6c2fce2e | 2841 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2842 | } else { |
ba1b41b6 N |
2843 | if (slot >= rdev->mddev->raid_disks && |
2844 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2845 | return -ENOSPC; |
2846 | rdev->raid_disk = slot; | |
2847 | /* assume it is working */ | |
c5d79adb N |
2848 | clear_bit(Faulty, &rdev->flags); |
2849 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2850 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2851 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2852 | } |
014236d2 N |
2853 | return len; |
2854 | } | |
2855 | ||
2856 | ||
2857 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2858 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2859 | |
93c8cad0 | 2860 | static ssize_t |
3cb03002 | 2861 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2862 | { |
6961ece4 | 2863 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2864 | } |
2865 | ||
2866 | static ssize_t | |
3cb03002 | 2867 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2868 | { |
c6563a8c N |
2869 | unsigned long long offset; |
2870 | if (strict_strtoull(buf, 10, &offset) < 0) | |
93c8cad0 | 2871 | return -EINVAL; |
8ed0a521 | 2872 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2873 | return -EBUSY; |
dd8ac336 | 2874 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2875 | /* Must set offset before size, so overlap checks |
2876 | * can be sane */ | |
2877 | return -EBUSY; | |
93c8cad0 | 2878 | rdev->data_offset = offset; |
25f7fd47 | 2879 | rdev->new_data_offset = offset; |
93c8cad0 N |
2880 | return len; |
2881 | } | |
2882 | ||
2883 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2884 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2885 | |
c6563a8c N |
2886 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2887 | { | |
2888 | return sprintf(page, "%llu\n", | |
2889 | (unsigned long long)rdev->new_data_offset); | |
2890 | } | |
2891 | ||
2892 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2893 | const char *buf, size_t len) | |
2894 | { | |
2895 | unsigned long long new_offset; | |
2896 | struct mddev *mddev = rdev->mddev; | |
2897 | ||
2898 | if (strict_strtoull(buf, 10, &new_offset) < 0) | |
2899 | return -EINVAL; | |
2900 | ||
2901 | if (mddev->sync_thread) | |
2902 | return -EBUSY; | |
2903 | if (new_offset == rdev->data_offset) | |
2904 | /* reset is always permitted */ | |
2905 | ; | |
2906 | else if (new_offset > rdev->data_offset) { | |
2907 | /* must not push array size beyond rdev_sectors */ | |
2908 | if (new_offset - rdev->data_offset | |
2909 | + mddev->dev_sectors > rdev->sectors) | |
2910 | return -E2BIG; | |
2911 | } | |
2912 | /* Metadata worries about other space details. */ | |
2913 | ||
2914 | /* decreasing the offset is inconsistent with a backwards | |
2915 | * reshape. | |
2916 | */ | |
2917 | if (new_offset < rdev->data_offset && | |
2918 | mddev->reshape_backwards) | |
2919 | return -EINVAL; | |
2920 | /* Increasing offset is inconsistent with forwards | |
2921 | * reshape. reshape_direction should be set to | |
2922 | * 'backwards' first. | |
2923 | */ | |
2924 | if (new_offset > rdev->data_offset && | |
2925 | !mddev->reshape_backwards) | |
2926 | return -EINVAL; | |
2927 | ||
2928 | if (mddev->pers && mddev->persistent && | |
2929 | !super_types[mddev->major_version] | |
2930 | .allow_new_offset(rdev, new_offset)) | |
2931 | return -E2BIG; | |
2932 | rdev->new_data_offset = new_offset; | |
2933 | if (new_offset > rdev->data_offset) | |
2934 | mddev->reshape_backwards = 1; | |
2935 | else if (new_offset < rdev->data_offset) | |
2936 | mddev->reshape_backwards = 0; | |
2937 | ||
2938 | return len; | |
2939 | } | |
2940 | static struct rdev_sysfs_entry rdev_new_offset = | |
2941 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2942 | ||
83303b61 | 2943 | static ssize_t |
3cb03002 | 2944 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2945 | { |
dd8ac336 | 2946 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2947 | } |
2948 | ||
c5d79adb N |
2949 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2950 | { | |
2951 | /* check if two start/length pairs overlap */ | |
2952 | if (s1+l1 <= s2) | |
2953 | return 0; | |
2954 | if (s2+l2 <= s1) | |
2955 | return 0; | |
2956 | return 1; | |
2957 | } | |
2958 | ||
b522adcd DW |
2959 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2960 | { | |
2961 | unsigned long long blocks; | |
2962 | sector_t new; | |
2963 | ||
2964 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2965 | return -EINVAL; | |
2966 | ||
2967 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2968 | return -EINVAL; /* sector conversion overflow */ | |
2969 | ||
2970 | new = blocks * 2; | |
2971 | if (new != blocks * 2) | |
2972 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2973 | ||
2974 | *sectors = new; | |
2975 | return 0; | |
2976 | } | |
2977 | ||
83303b61 | 2978 | static ssize_t |
3cb03002 | 2979 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2980 | { |
fd01b88c | 2981 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2982 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2983 | sector_t sectors; |
27c529bb | 2984 | |
b522adcd | 2985 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2986 | return -EINVAL; |
c6563a8c N |
2987 | if (rdev->data_offset != rdev->new_data_offset) |
2988 | return -EINVAL; /* too confusing */ | |
0cd17fec | 2989 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2990 | if (my_mddev->persistent) { |
dd8ac336 AN |
2991 | sectors = super_types[my_mddev->major_version]. |
2992 | rdev_size_change(rdev, sectors); | |
2993 | if (!sectors) | |
0cd17fec | 2994 | return -EBUSY; |
dd8ac336 | 2995 | } else if (!sectors) |
77304d2a | 2996 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2997 | rdev->data_offset; |
a6468539 N |
2998 | if (!my_mddev->pers->resize) |
2999 | /* Cannot change size for RAID0 or Linear etc */ | |
3000 | return -EINVAL; | |
0cd17fec | 3001 | } |
dd8ac336 | 3002 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 3003 | return -EINVAL; /* component must fit device */ |
0cd17fec | 3004 | |
dd8ac336 AN |
3005 | rdev->sectors = sectors; |
3006 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
3007 | /* need to check that all other rdevs with the same ->bdev |
3008 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 3009 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
3010 | * we have to change it back, we will have the lock again. |
3011 | */ | |
fd01b88c | 3012 | struct mddev *mddev; |
c5d79adb | 3013 | int overlap = 0; |
159ec1fc | 3014 | struct list_head *tmp; |
c5d79adb | 3015 | |
27c529bb | 3016 | mddev_unlock(my_mddev); |
29ac4aa3 | 3017 | for_each_mddev(mddev, tmp) { |
3cb03002 | 3018 | struct md_rdev *rdev2; |
c5d79adb N |
3019 | |
3020 | mddev_lock(mddev); | |
dafb20fa | 3021 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
3022 | if (rdev->bdev == rdev2->bdev && |
3023 | rdev != rdev2 && | |
3024 | overlaps(rdev->data_offset, rdev->sectors, | |
3025 | rdev2->data_offset, | |
3026 | rdev2->sectors)) { | |
c5d79adb N |
3027 | overlap = 1; |
3028 | break; | |
3029 | } | |
3030 | mddev_unlock(mddev); | |
3031 | if (overlap) { | |
3032 | mddev_put(mddev); | |
3033 | break; | |
3034 | } | |
3035 | } | |
27c529bb | 3036 | mddev_lock(my_mddev); |
c5d79adb N |
3037 | if (overlap) { |
3038 | /* Someone else could have slipped in a size | |
3039 | * change here, but doing so is just silly. | |
dd8ac336 | 3040 | * We put oldsectors back because we *know* it is |
c5d79adb N |
3041 | * safe, and trust userspace not to race with |
3042 | * itself | |
3043 | */ | |
dd8ac336 | 3044 | rdev->sectors = oldsectors; |
c5d79adb N |
3045 | return -EBUSY; |
3046 | } | |
3047 | } | |
83303b61 N |
3048 | return len; |
3049 | } | |
3050 | ||
3051 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 3052 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 3053 | |
06e3c817 | 3054 | |
3cb03002 | 3055 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
3056 | { |
3057 | unsigned long long recovery_start = rdev->recovery_offset; | |
3058 | ||
3059 | if (test_bit(In_sync, &rdev->flags) || | |
3060 | recovery_start == MaxSector) | |
3061 | return sprintf(page, "none\n"); | |
3062 | ||
3063 | return sprintf(page, "%llu\n", recovery_start); | |
3064 | } | |
3065 | ||
3cb03002 | 3066 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
3067 | { |
3068 | unsigned long long recovery_start; | |
3069 | ||
3070 | if (cmd_match(buf, "none")) | |
3071 | recovery_start = MaxSector; | |
3072 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
3073 | return -EINVAL; | |
3074 | ||
3075 | if (rdev->mddev->pers && | |
3076 | rdev->raid_disk >= 0) | |
3077 | return -EBUSY; | |
3078 | ||
3079 | rdev->recovery_offset = recovery_start; | |
3080 | if (recovery_start == MaxSector) | |
3081 | set_bit(In_sync, &rdev->flags); | |
3082 | else | |
3083 | clear_bit(In_sync, &rdev->flags); | |
3084 | return len; | |
3085 | } | |
3086 | ||
3087 | static struct rdev_sysfs_entry rdev_recovery_start = | |
3088 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
3089 | ||
16c791a5 N |
3090 | |
3091 | static ssize_t | |
3092 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
3093 | static ssize_t | |
3094 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
3095 | ||
3cb03002 | 3096 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3097 | { |
3098 | return badblocks_show(&rdev->badblocks, page, 0); | |
3099 | } | |
3cb03002 | 3100 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 3101 | { |
de393cde N |
3102 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
3103 | /* Maybe that ack was all we needed */ | |
3104 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
3105 | wake_up(&rdev->blocked_wait); | |
3106 | return rv; | |
16c791a5 N |
3107 | } |
3108 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
3109 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
3110 | ||
3111 | ||
3cb03002 | 3112 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3113 | { |
3114 | return badblocks_show(&rdev->badblocks, page, 1); | |
3115 | } | |
3cb03002 | 3116 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
3117 | { |
3118 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
3119 | } | |
3120 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
3121 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
3122 | ||
86e6ffdd N |
3123 | static struct attribute *rdev_default_attrs[] = { |
3124 | &rdev_state.attr, | |
4dbcdc75 | 3125 | &rdev_errors.attr, |
014236d2 | 3126 | &rdev_slot.attr, |
93c8cad0 | 3127 | &rdev_offset.attr, |
c6563a8c | 3128 | &rdev_new_offset.attr, |
83303b61 | 3129 | &rdev_size.attr, |
06e3c817 | 3130 | &rdev_recovery_start.attr, |
16c791a5 N |
3131 | &rdev_bad_blocks.attr, |
3132 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
3133 | NULL, |
3134 | }; | |
3135 | static ssize_t | |
3136 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3137 | { | |
3138 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3139 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
fd01b88c | 3140 | struct mddev *mddev = rdev->mddev; |
27c529bb | 3141 | ssize_t rv; |
86e6ffdd N |
3142 | |
3143 | if (!entry->show) | |
3144 | return -EIO; | |
27c529bb N |
3145 | |
3146 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
3147 | if (!rv) { | |
3148 | if (rdev->mddev == NULL) | |
3149 | rv = -EBUSY; | |
3150 | else | |
3151 | rv = entry->show(rdev, page); | |
3152 | mddev_unlock(mddev); | |
3153 | } | |
3154 | return rv; | |
86e6ffdd N |
3155 | } |
3156 | ||
3157 | static ssize_t | |
3158 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
3159 | const char *page, size_t length) | |
3160 | { | |
3161 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3162 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 3163 | ssize_t rv; |
fd01b88c | 3164 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
3165 | |
3166 | if (!entry->store) | |
3167 | return -EIO; | |
67463acb N |
3168 | if (!capable(CAP_SYS_ADMIN)) |
3169 | return -EACCES; | |
27c529bb | 3170 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 3171 | if (!rv) { |
27c529bb N |
3172 | if (rdev->mddev == NULL) |
3173 | rv = -EBUSY; | |
3174 | else | |
3175 | rv = entry->store(rdev, page, length); | |
6a51830e | 3176 | mddev_unlock(mddev); |
ca388059 N |
3177 | } |
3178 | return rv; | |
86e6ffdd N |
3179 | } |
3180 | ||
3181 | static void rdev_free(struct kobject *ko) | |
3182 | { | |
3cb03002 | 3183 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3184 | kfree(rdev); |
3185 | } | |
52cf25d0 | 3186 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3187 | .show = rdev_attr_show, |
3188 | .store = rdev_attr_store, | |
3189 | }; | |
3190 | static struct kobj_type rdev_ktype = { | |
3191 | .release = rdev_free, | |
3192 | .sysfs_ops = &rdev_sysfs_ops, | |
3193 | .default_attrs = rdev_default_attrs, | |
3194 | }; | |
3195 | ||
3cb03002 | 3196 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3197 | { |
3198 | rdev->desc_nr = -1; | |
3199 | rdev->saved_raid_disk = -1; | |
3200 | rdev->raid_disk = -1; | |
3201 | rdev->flags = 0; | |
3202 | rdev->data_offset = 0; | |
c6563a8c | 3203 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3204 | rdev->sb_events = 0; |
3205 | rdev->last_read_error.tv_sec = 0; | |
3206 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3207 | rdev->sb_loaded = 0; |
3208 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3209 | atomic_set(&rdev->nr_pending, 0); |
3210 | atomic_set(&rdev->read_errors, 0); | |
3211 | atomic_set(&rdev->corrected_errors, 0); | |
3212 | ||
3213 | INIT_LIST_HEAD(&rdev->same_set); | |
3214 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3215 | |
3216 | /* Add space to store bad block list. | |
3217 | * This reserves the space even on arrays where it cannot | |
3218 | * be used - I wonder if that matters | |
3219 | */ | |
3220 | rdev->badblocks.count = 0; | |
486adf72 | 3221 | rdev->badblocks.shift = -1; /* disabled until explicitly enabled */ |
2230dfe4 N |
3222 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); |
3223 | seqlock_init(&rdev->badblocks.lock); | |
3224 | if (rdev->badblocks.page == NULL) | |
3225 | return -ENOMEM; | |
3226 | ||
3227 | return 0; | |
e8bb9a83 N |
3228 | } |
3229 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3230 | /* |
3231 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3232 | * | |
3233 | * mark the device faulty if: | |
3234 | * | |
3235 | * - the device is nonexistent (zero size) | |
3236 | * - the device has no valid superblock | |
3237 | * | |
3238 | * a faulty rdev _never_ has rdev->sb set. | |
3239 | */ | |
3cb03002 | 3240 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3241 | { |
3242 | char b[BDEVNAME_SIZE]; | |
3243 | int err; | |
3cb03002 | 3244 | struct md_rdev *rdev; |
1da177e4 LT |
3245 | sector_t size; |
3246 | ||
9ffae0cf | 3247 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3248 | if (!rdev) { |
3249 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3250 | return ERR_PTR(-ENOMEM); | |
3251 | } | |
1da177e4 | 3252 | |
2230dfe4 N |
3253 | err = md_rdev_init(rdev); |
3254 | if (err) | |
3255 | goto abort_free; | |
3256 | err = alloc_disk_sb(rdev); | |
3257 | if (err) | |
1da177e4 LT |
3258 | goto abort_free; |
3259 | ||
c5d79adb | 3260 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3261 | if (err) |
3262 | goto abort_free; | |
3263 | ||
f9cb074b | 3264 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3265 | |
77304d2a | 3266 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 LT |
3267 | if (!size) { |
3268 | printk(KERN_WARNING | |
3269 | "md: %s has zero or unknown size, marking faulty!\n", | |
3270 | bdevname(rdev->bdev,b)); | |
3271 | err = -EINVAL; | |
3272 | goto abort_free; | |
3273 | } | |
3274 | ||
3275 | if (super_format >= 0) { | |
3276 | err = super_types[super_format]. | |
3277 | load_super(rdev, NULL, super_minor); | |
3278 | if (err == -EINVAL) { | |
df968c4e N |
3279 | printk(KERN_WARNING |
3280 | "md: %s does not have a valid v%d.%d " | |
3281 | "superblock, not importing!\n", | |
3282 | bdevname(rdev->bdev,b), | |
3283 | super_format, super_minor); | |
1da177e4 LT |
3284 | goto abort_free; |
3285 | } | |
3286 | if (err < 0) { | |
3287 | printk(KERN_WARNING | |
3288 | "md: could not read %s's sb, not importing!\n", | |
3289 | bdevname(rdev->bdev,b)); | |
3290 | goto abort_free; | |
3291 | } | |
3292 | } | |
6bfe0b49 | 3293 | |
1da177e4 LT |
3294 | return rdev; |
3295 | ||
3296 | abort_free: | |
2699b672 N |
3297 | if (rdev->bdev) |
3298 | unlock_rdev(rdev); | |
545c8795 | 3299 | md_rdev_clear(rdev); |
1da177e4 LT |
3300 | kfree(rdev); |
3301 | return ERR_PTR(err); | |
3302 | } | |
3303 | ||
3304 | /* | |
3305 | * Check a full RAID array for plausibility | |
3306 | */ | |
3307 | ||
3308 | ||
fd01b88c | 3309 | static void analyze_sbs(struct mddev * mddev) |
1da177e4 LT |
3310 | { |
3311 | int i; | |
3cb03002 | 3312 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3313 | char b[BDEVNAME_SIZE]; |
3314 | ||
3315 | freshest = NULL; | |
dafb20fa | 3316 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3317 | switch (super_types[mddev->major_version]. |
3318 | load_super(rdev, freshest, mddev->minor_version)) { | |
3319 | case 1: | |
3320 | freshest = rdev; | |
3321 | break; | |
3322 | case 0: | |
3323 | break; | |
3324 | default: | |
3325 | printk( KERN_ERR \ | |
3326 | "md: fatal superblock inconsistency in %s" | |
3327 | " -- removing from array\n", | |
3328 | bdevname(rdev->bdev,b)); | |
3329 | kick_rdev_from_array(rdev); | |
3330 | } | |
3331 | ||
3332 | ||
3333 | super_types[mddev->major_version]. | |
3334 | validate_super(mddev, freshest); | |
3335 | ||
3336 | i = 0; | |
dafb20fa | 3337 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3338 | if (mddev->max_disks && |
3339 | (rdev->desc_nr >= mddev->max_disks || | |
3340 | i > mddev->max_disks)) { | |
de01dfad N |
3341 | printk(KERN_WARNING |
3342 | "md: %s: %s: only %d devices permitted\n", | |
3343 | mdname(mddev), bdevname(rdev->bdev, b), | |
3344 | mddev->max_disks); | |
3345 | kick_rdev_from_array(rdev); | |
3346 | continue; | |
3347 | } | |
1da177e4 LT |
3348 | if (rdev != freshest) |
3349 | if (super_types[mddev->major_version]. | |
3350 | validate_super(mddev, rdev)) { | |
3351 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3352 | " from array!\n", | |
3353 | bdevname(rdev->bdev,b)); | |
3354 | kick_rdev_from_array(rdev); | |
3355 | continue; | |
3356 | } | |
3357 | if (mddev->level == LEVEL_MULTIPATH) { | |
3358 | rdev->desc_nr = i++; | |
3359 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3360 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3361 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3362 | rdev->raid_disk = -1; |
3363 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3364 | } |
3365 | } | |
1da177e4 LT |
3366 | } |
3367 | ||
72e02075 N |
3368 | /* Read a fixed-point number. |
3369 | * Numbers in sysfs attributes should be in "standard" units where | |
3370 | * possible, so time should be in seconds. | |
3371 | * However we internally use a a much smaller unit such as | |
3372 | * milliseconds or jiffies. | |
3373 | * This function takes a decimal number with a possible fractional | |
3374 | * component, and produces an integer which is the result of | |
3375 | * multiplying that number by 10^'scale'. | |
3376 | * all without any floating-point arithmetic. | |
3377 | */ | |
3378 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3379 | { | |
3380 | unsigned long result = 0; | |
3381 | long decimals = -1; | |
3382 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3383 | if (*cp == '.') | |
3384 | decimals = 0; | |
3385 | else if (decimals < scale) { | |
3386 | unsigned int value; | |
3387 | value = *cp - '0'; | |
3388 | result = result * 10 + value; | |
3389 | if (decimals >= 0) | |
3390 | decimals++; | |
3391 | } | |
3392 | cp++; | |
3393 | } | |
3394 | if (*cp == '\n') | |
3395 | cp++; | |
3396 | if (*cp) | |
3397 | return -EINVAL; | |
3398 | if (decimals < 0) | |
3399 | decimals = 0; | |
3400 | while (decimals < scale) { | |
3401 | result *= 10; | |
3402 | decimals ++; | |
3403 | } | |
3404 | *res = result; | |
3405 | return 0; | |
3406 | } | |
3407 | ||
3408 | ||
19052c0e N |
3409 | static void md_safemode_timeout(unsigned long data); |
3410 | ||
16f17b39 | 3411 | static ssize_t |
fd01b88c | 3412 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3413 | { |
3414 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3415 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3416 | } | |
3417 | static ssize_t | |
fd01b88c | 3418 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3419 | { |
16f17b39 | 3420 | unsigned long msec; |
97ce0a7f | 3421 | |
72e02075 | 3422 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3423 | return -EINVAL; |
16f17b39 N |
3424 | if (msec == 0) |
3425 | mddev->safemode_delay = 0; | |
3426 | else { | |
19052c0e | 3427 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
3428 | mddev->safemode_delay = (msec*HZ)/1000; |
3429 | if (mddev->safemode_delay == 0) | |
3430 | mddev->safemode_delay = 1; | |
19052c0e N |
3431 | if (mddev->safemode_delay < old_delay) |
3432 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
3433 | } |
3434 | return len; | |
3435 | } | |
3436 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3437 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3438 | |
eae1701f | 3439 | static ssize_t |
fd01b88c | 3440 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3441 | { |
84fc4b56 | 3442 | struct md_personality *p = mddev->pers; |
d9d166c2 | 3443 | if (p) |
eae1701f | 3444 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
3445 | else if (mddev->clevel[0]) |
3446 | return sprintf(page, "%s\n", mddev->clevel); | |
3447 | else if (mddev->level != LEVEL_NONE) | |
3448 | return sprintf(page, "%d\n", mddev->level); | |
3449 | else | |
3450 | return 0; | |
eae1701f N |
3451 | } |
3452 | ||
d9d166c2 | 3453 | static ssize_t |
fd01b88c | 3454 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3455 | { |
f2859af6 | 3456 | char clevel[16]; |
20a49ff6 | 3457 | ssize_t rv = len; |
84fc4b56 | 3458 | struct md_personality *pers; |
f2859af6 | 3459 | long level; |
245f46c2 | 3460 | void *priv; |
3cb03002 | 3461 | struct md_rdev *rdev; |
245f46c2 N |
3462 | |
3463 | if (mddev->pers == NULL) { | |
3464 | if (len == 0) | |
3465 | return 0; | |
3466 | if (len >= sizeof(mddev->clevel)) | |
3467 | return -ENOSPC; | |
3468 | strncpy(mddev->clevel, buf, len); | |
3469 | if (mddev->clevel[len-1] == '\n') | |
3470 | len--; | |
3471 | mddev->clevel[len] = 0; | |
3472 | mddev->level = LEVEL_NONE; | |
3473 | return rv; | |
3474 | } | |
3475 | ||
3476 | /* request to change the personality. Need to ensure: | |
3477 | * - array is not engaged in resync/recovery/reshape | |
3478 | * - old personality can be suspended | |
3479 | * - new personality will access other array. | |
3480 | */ | |
3481 | ||
bb4f1e9d N |
3482 | if (mddev->sync_thread || |
3483 | mddev->reshape_position != MaxSector || | |
3484 | mddev->sysfs_active) | |
d9d166c2 | 3485 | return -EBUSY; |
245f46c2 N |
3486 | |
3487 | if (!mddev->pers->quiesce) { | |
3488 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3489 | mdname(mddev), mddev->pers->name); | |
3490 | return -EINVAL; | |
3491 | } | |
3492 | ||
3493 | /* Now find the new personality */ | |
f2859af6 | 3494 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3495 | return -EINVAL; |
f2859af6 DW |
3496 | strncpy(clevel, buf, len); |
3497 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3498 | len--; |
f2859af6 DW |
3499 | clevel[len] = 0; |
3500 | if (strict_strtol(clevel, 10, &level)) | |
3501 | level = LEVEL_NONE; | |
245f46c2 | 3502 | |
f2859af6 DW |
3503 | if (request_module("md-%s", clevel) != 0) |
3504 | request_module("md-level-%s", clevel); | |
245f46c2 | 3505 | spin_lock(&pers_lock); |
f2859af6 | 3506 | pers = find_pers(level, clevel); |
245f46c2 N |
3507 | if (!pers || !try_module_get(pers->owner)) { |
3508 | spin_unlock(&pers_lock); | |
f2859af6 | 3509 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3510 | return -EINVAL; |
3511 | } | |
3512 | spin_unlock(&pers_lock); | |
3513 | ||
3514 | if (pers == mddev->pers) { | |
3515 | /* Nothing to do! */ | |
3516 | module_put(pers->owner); | |
3517 | return rv; | |
3518 | } | |
3519 | if (!pers->takeover) { | |
3520 | module_put(pers->owner); | |
3521 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3522 | mdname(mddev), clevel); |
245f46c2 N |
3523 | return -EINVAL; |
3524 | } | |
3525 | ||
dafb20fa | 3526 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3527 | rdev->new_raid_disk = rdev->raid_disk; |
3528 | ||
245f46c2 N |
3529 | /* ->takeover must set new_* and/or delta_disks |
3530 | * if it succeeds, and may set them when it fails. | |
3531 | */ | |
3532 | priv = pers->takeover(mddev); | |
3533 | if (IS_ERR(priv)) { | |
3534 | mddev->new_level = mddev->level; | |
3535 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3536 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3537 | mddev->raid_disks -= mddev->delta_disks; |
3538 | mddev->delta_disks = 0; | |
2c810cdd | 3539 | mddev->reshape_backwards = 0; |
245f46c2 N |
3540 | module_put(pers->owner); |
3541 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3542 | mdname(mddev), clevel); |
245f46c2 N |
3543 | return PTR_ERR(priv); |
3544 | } | |
3545 | ||
3546 | /* Looks like we have a winner */ | |
3547 | mddev_suspend(mddev); | |
3548 | mddev->pers->stop(mddev); | |
a64c876f N |
3549 | |
3550 | if (mddev->pers->sync_request == NULL && | |
3551 | pers->sync_request != NULL) { | |
3552 | /* need to add the md_redundancy_group */ | |
3553 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3554 | printk(KERN_WARNING | |
3555 | "md: cannot register extra attributes for %s\n", | |
3556 | mdname(mddev)); | |
19fdb9ee | 3557 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3558 | } |
3559 | if (mddev->pers->sync_request != NULL && | |
3560 | pers->sync_request == NULL) { | |
3561 | /* need to remove the md_redundancy_group */ | |
3562 | if (mddev->to_remove == NULL) | |
3563 | mddev->to_remove = &md_redundancy_group; | |
3564 | } | |
3565 | ||
54071b38 TM |
3566 | if (mddev->pers->sync_request == NULL && |
3567 | mddev->external) { | |
3568 | /* We are converting from a no-redundancy array | |
3569 | * to a redundancy array and metadata is managed | |
3570 | * externally so we need to be sure that writes | |
3571 | * won't block due to a need to transition | |
3572 | * clean->dirty | |
3573 | * until external management is started. | |
3574 | */ | |
3575 | mddev->in_sync = 0; | |
3576 | mddev->safemode_delay = 0; | |
3577 | mddev->safemode = 0; | |
3578 | } | |
3579 | ||
dafb20fa | 3580 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3581 | if (rdev->raid_disk < 0) |
3582 | continue; | |
bf2cb0da | 3583 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3584 | rdev->new_raid_disk = -1; |
3585 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3586 | continue; | |
36fad858 | 3587 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3588 | } |
dafb20fa | 3589 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3590 | if (rdev->raid_disk < 0) |
3591 | continue; | |
3592 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3593 | continue; | |
3594 | rdev->raid_disk = rdev->new_raid_disk; | |
3595 | if (rdev->raid_disk < 0) | |
3a981b03 | 3596 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3597 | else { |
36fad858 NK |
3598 | if (sysfs_link_rdev(mddev, rdev)) |
3599 | printk(KERN_WARNING "md: cannot register rd%d" | |
3600 | " for %s after level change\n", | |
3601 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3602 | } |
e93f68a1 N |
3603 | } |
3604 | ||
3605 | module_put(mddev->pers->owner); | |
245f46c2 N |
3606 | mddev->pers = pers; |
3607 | mddev->private = priv; | |
3608 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3609 | mddev->level = mddev->new_level; | |
3610 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3611 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3612 | mddev->delta_disks = 0; |
2c810cdd | 3613 | mddev->reshape_backwards = 0; |
fee68723 | 3614 | mddev->degraded = 0; |
9af204cf TM |
3615 | if (mddev->pers->sync_request == NULL) { |
3616 | /* this is now an array without redundancy, so | |
3617 | * it must always be in_sync | |
3618 | */ | |
3619 | mddev->in_sync = 1; | |
3620 | del_timer_sync(&mddev->safemode_timer); | |
3621 | } | |
245f46c2 | 3622 | pers->run(mddev); |
245f46c2 | 3623 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
47525e59 | 3624 | mddev_resume(mddev); |
5cac7861 | 3625 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3626 | md_new_event(mddev); |
d9d166c2 N |
3627 | return rv; |
3628 | } | |
3629 | ||
3630 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3631 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3632 | |
d4dbd025 N |
3633 | |
3634 | static ssize_t | |
fd01b88c | 3635 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3636 | { |
3637 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3638 | if (mddev->reshape_position != MaxSector && |
3639 | mddev->layout != mddev->new_layout) | |
3640 | return sprintf(page, "%d (%d)\n", | |
3641 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3642 | return sprintf(page, "%d\n", mddev->layout); |
3643 | } | |
3644 | ||
3645 | static ssize_t | |
fd01b88c | 3646 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 N |
3647 | { |
3648 | char *e; | |
3649 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3650 | |
3651 | if (!*buf || (*e && *e != '\n')) | |
3652 | return -EINVAL; | |
3653 | ||
b3546035 N |
3654 | if (mddev->pers) { |
3655 | int err; | |
50ac168a | 3656 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3657 | return -EBUSY; |
597a711b | 3658 | mddev->new_layout = n; |
50ac168a | 3659 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3660 | if (err) { |
3661 | mddev->new_layout = mddev->layout; | |
b3546035 | 3662 | return err; |
597a711b | 3663 | } |
b3546035 | 3664 | } else { |
08a02ecd | 3665 | mddev->new_layout = n; |
b3546035 N |
3666 | if (mddev->reshape_position == MaxSector) |
3667 | mddev->layout = n; | |
3668 | } | |
d4dbd025 N |
3669 | return len; |
3670 | } | |
3671 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3672 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3673 | |
3674 | ||
eae1701f | 3675 | static ssize_t |
fd01b88c | 3676 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3677 | { |
bb636547 N |
3678 | if (mddev->raid_disks == 0) |
3679 | return 0; | |
08a02ecd N |
3680 | if (mddev->reshape_position != MaxSector && |
3681 | mddev->delta_disks != 0) | |
3682 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3683 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3684 | return sprintf(page, "%d\n", mddev->raid_disks); |
3685 | } | |
3686 | ||
fd01b88c | 3687 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3688 | |
3689 | static ssize_t | |
fd01b88c | 3690 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3691 | { |
da943b99 N |
3692 | char *e; |
3693 | int rv = 0; | |
3694 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3695 | ||
3696 | if (!*buf || (*e && *e != '\n')) | |
3697 | return -EINVAL; | |
3698 | ||
3699 | if (mddev->pers) | |
3700 | rv = update_raid_disks(mddev, n); | |
08a02ecd | 3701 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3702 | struct md_rdev *rdev; |
08a02ecd | 3703 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c N |
3704 | |
3705 | rdev_for_each(rdev, mddev) { | |
3706 | if (olddisks < n && | |
3707 | rdev->data_offset < rdev->new_data_offset) | |
3708 | return -EINVAL; | |
3709 | if (olddisks > n && | |
3710 | rdev->data_offset > rdev->new_data_offset) | |
3711 | return -EINVAL; | |
3712 | } | |
08a02ecd N |
3713 | mddev->delta_disks = n - olddisks; |
3714 | mddev->raid_disks = n; | |
2c810cdd | 3715 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3716 | } else |
da943b99 N |
3717 | mddev->raid_disks = n; |
3718 | return rv ? rv : len; | |
3719 | } | |
3720 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3721 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3722 | |
3b34380a | 3723 | static ssize_t |
fd01b88c | 3724 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3725 | { |
08a02ecd | 3726 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3727 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3728 | return sprintf(page, "%d (%d)\n", | |
3729 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3730 | mddev->chunk_sectors << 9); |
3731 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3732 | } |
3733 | ||
3734 | static ssize_t | |
fd01b88c | 3735 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3736 | { |
3b34380a N |
3737 | char *e; |
3738 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3739 | ||
3b34380a N |
3740 | if (!*buf || (*e && *e != '\n')) |
3741 | return -EINVAL; | |
3742 | ||
b3546035 N |
3743 | if (mddev->pers) { |
3744 | int err; | |
50ac168a | 3745 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3746 | return -EBUSY; |
597a711b | 3747 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3748 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3749 | if (err) { |
3750 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3751 | return err; |
597a711b | 3752 | } |
b3546035 | 3753 | } else { |
664e7c41 | 3754 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3755 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3756 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3757 | } |
3b34380a N |
3758 | return len; |
3759 | } | |
3760 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3761 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3762 | |
a94213b1 | 3763 | static ssize_t |
fd01b88c | 3764 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3765 | { |
d1a7c503 N |
3766 | if (mddev->recovery_cp == MaxSector) |
3767 | return sprintf(page, "none\n"); | |
a94213b1 N |
3768 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3769 | } | |
3770 | ||
3771 | static ssize_t | |
fd01b88c | 3772 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3773 | { |
a94213b1 N |
3774 | char *e; |
3775 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3776 | ||
b098636c | 3777 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3778 | return -EBUSY; |
06e3c817 DW |
3779 | if (cmd_match(buf, "none")) |
3780 | n = MaxSector; | |
3781 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3782 | return -EINVAL; |
3783 | ||
3784 | mddev->recovery_cp = n; | |
db07d85e N |
3785 | if (mddev->pers) |
3786 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
a94213b1 N |
3787 | return len; |
3788 | } | |
3789 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3790 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3791 | |
9e653b63 N |
3792 | /* |
3793 | * The array state can be: | |
3794 | * | |
3795 | * clear | |
3796 | * No devices, no size, no level | |
3797 | * Equivalent to STOP_ARRAY ioctl | |
3798 | * inactive | |
3799 | * May have some settings, but array is not active | |
3800 | * all IO results in error | |
3801 | * When written, doesn't tear down array, but just stops it | |
3802 | * suspended (not supported yet) | |
3803 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3804 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3805 | * readonly |
3806 | * no resync can happen. no superblocks get written. | |
3807 | * write requests fail | |
3808 | * read-auto | |
3809 | * like readonly, but behaves like 'clean' on a write request. | |
3810 | * | |
3811 | * clean - no pending writes, but otherwise active. | |
3812 | * When written to inactive array, starts without resync | |
3813 | * If a write request arrives then | |
3814 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3815 | * if not known, block and switch to write-pending | |
3816 | * If written to an active array that has pending writes, then fails. | |
3817 | * active | |
3818 | * fully active: IO and resync can be happening. | |
3819 | * When written to inactive array, starts with resync | |
3820 | * | |
3821 | * write-pending | |
3822 | * clean, but writes are blocked waiting for 'active' to be written. | |
3823 | * | |
3824 | * active-idle | |
3825 | * like active, but no writes have been seen for a while (100msec). | |
3826 | * | |
3827 | */ | |
3828 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3829 | write_pending, active_idle, bad_word}; | |
05381954 | 3830 | static char *array_states[] = { |
9e653b63 N |
3831 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3832 | "write-pending", "active-idle", NULL }; | |
3833 | ||
3834 | static int match_word(const char *word, char **list) | |
3835 | { | |
3836 | int n; | |
3837 | for (n=0; list[n]; n++) | |
3838 | if (cmd_match(word, list[n])) | |
3839 | break; | |
3840 | return n; | |
3841 | } | |
3842 | ||
3843 | static ssize_t | |
fd01b88c | 3844 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3845 | { |
3846 | enum array_state st = inactive; | |
3847 | ||
3848 | if (mddev->pers) | |
3849 | switch(mddev->ro) { | |
3850 | case 1: | |
3851 | st = readonly; | |
3852 | break; | |
3853 | case 2: | |
3854 | st = read_auto; | |
3855 | break; | |
3856 | case 0: | |
3857 | if (mddev->in_sync) | |
3858 | st = clean; | |
070dc6dd | 3859 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3860 | st = write_pending; |
9e653b63 N |
3861 | else if (mddev->safemode) |
3862 | st = active_idle; | |
3863 | else | |
3864 | st = active; | |
3865 | } | |
3866 | else { | |
3867 | if (list_empty(&mddev->disks) && | |
3868 | mddev->raid_disks == 0 && | |
58c0fed4 | 3869 | mddev->dev_sectors == 0) |
9e653b63 N |
3870 | st = clear; |
3871 | else | |
3872 | st = inactive; | |
3873 | } | |
3874 | return sprintf(page, "%s\n", array_states[st]); | |
3875 | } | |
3876 | ||
a05b7ea0 N |
3877 | static int do_md_stop(struct mddev * mddev, int ro, struct block_device *bdev); |
3878 | static int md_set_readonly(struct mddev * mddev, struct block_device *bdev); | |
fd01b88c N |
3879 | static int do_md_run(struct mddev * mddev); |
3880 | static int restart_array(struct mddev *mddev); | |
9e653b63 N |
3881 | |
3882 | static ssize_t | |
fd01b88c | 3883 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 N |
3884 | { |
3885 | int err = -EINVAL; | |
3886 | enum array_state st = match_word(buf, array_states); | |
3887 | switch(st) { | |
3888 | case bad_word: | |
3889 | break; | |
3890 | case clear: | |
3891 | /* stopping an active array */ | |
a05b7ea0 | 3892 | err = do_md_stop(mddev, 0, NULL); |
9e653b63 N |
3893 | break; |
3894 | case inactive: | |
3895 | /* stopping an active array */ | |
90cf195d | 3896 | if (mddev->pers) |
a05b7ea0 | 3897 | err = do_md_stop(mddev, 2, NULL); |
90cf195d | 3898 | else |
e691063a | 3899 | err = 0; /* already inactive */ |
9e653b63 N |
3900 | break; |
3901 | case suspended: | |
3902 | break; /* not supported yet */ | |
3903 | case readonly: | |
3904 | if (mddev->pers) | |
a05b7ea0 | 3905 | err = md_set_readonly(mddev, NULL); |
9e653b63 N |
3906 | else { |
3907 | mddev->ro = 1; | |
648b629e | 3908 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3909 | err = do_md_run(mddev); |
3910 | } | |
3911 | break; | |
3912 | case read_auto: | |
9e653b63 | 3913 | if (mddev->pers) { |
80268ee9 | 3914 | if (mddev->ro == 0) |
a05b7ea0 | 3915 | err = md_set_readonly(mddev, NULL); |
80268ee9 | 3916 | else if (mddev->ro == 1) |
648b629e N |
3917 | err = restart_array(mddev); |
3918 | if (err == 0) { | |
3919 | mddev->ro = 2; | |
3920 | set_disk_ro(mddev->gendisk, 0); | |
3921 | } | |
9e653b63 N |
3922 | } else { |
3923 | mddev->ro = 2; | |
3924 | err = do_md_run(mddev); | |
3925 | } | |
3926 | break; | |
3927 | case clean: | |
3928 | if (mddev->pers) { | |
3929 | restart_array(mddev); | |
3930 | spin_lock_irq(&mddev->write_lock); | |
3931 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3932 | if (mddev->in_sync == 0) { |
3933 | mddev->in_sync = 1; | |
31a59e34 N |
3934 | if (mddev->safemode == 1) |
3935 | mddev->safemode = 0; | |
070dc6dd | 3936 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3937 | } |
3938 | err = 0; | |
3939 | } else | |
3940 | err = -EBUSY; | |
9e653b63 | 3941 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3942 | } else |
3943 | err = -EINVAL; | |
9e653b63 N |
3944 | break; |
3945 | case active: | |
3946 | if (mddev->pers) { | |
3947 | restart_array(mddev); | |
070dc6dd | 3948 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3949 | wake_up(&mddev->sb_wait); |
3950 | err = 0; | |
3951 | } else { | |
3952 | mddev->ro = 0; | |
648b629e | 3953 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3954 | err = do_md_run(mddev); |
3955 | } | |
3956 | break; | |
3957 | case write_pending: | |
3958 | case active_idle: | |
3959 | /* these cannot be set */ | |
3960 | break; | |
3961 | } | |
3962 | if (err) | |
3963 | return err; | |
0fd62b86 | 3964 | else { |
1d23f178 N |
3965 | if (mddev->hold_active == UNTIL_IOCTL) |
3966 | mddev->hold_active = 0; | |
00bcb4ac | 3967 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3968 | return len; |
0fd62b86 | 3969 | } |
9e653b63 | 3970 | } |
80ca3a44 N |
3971 | static struct md_sysfs_entry md_array_state = |
3972 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3973 | |
1e50915f | 3974 | static ssize_t |
fd01b88c | 3975 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3976 | return sprintf(page, "%d\n", |
3977 | atomic_read(&mddev->max_corr_read_errors)); | |
3978 | } | |
3979 | ||
3980 | static ssize_t | |
fd01b88c | 3981 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f RB |
3982 | { |
3983 | char *e; | |
3984 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3985 | ||
3986 | if (*buf && (*e == 0 || *e == '\n')) { | |
3987 | atomic_set(&mddev->max_corr_read_errors, n); | |
3988 | return len; | |
3989 | } | |
3990 | return -EINVAL; | |
3991 | } | |
3992 | ||
3993 | static struct md_sysfs_entry max_corr_read_errors = | |
3994 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3995 | max_corrected_read_errors_store); | |
3996 | ||
6d7ff738 | 3997 | static ssize_t |
fd01b88c | 3998 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3999 | { |
4000 | return -EINVAL; | |
4001 | } | |
4002 | ||
4003 | static ssize_t | |
fd01b88c | 4004 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
4005 | { |
4006 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
4007 | /* The new device is added to the array. | |
4008 | * If the array has a persistent superblock, we read the | |
4009 | * superblock to initialise info and check validity. | |
4010 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
4011 | * which mainly checks size. | |
4012 | */ | |
4013 | char *e; | |
4014 | int major = simple_strtoul(buf, &e, 10); | |
4015 | int minor; | |
4016 | dev_t dev; | |
3cb03002 | 4017 | struct md_rdev *rdev; |
6d7ff738 N |
4018 | int err; |
4019 | ||
4020 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
4021 | return -EINVAL; | |
4022 | minor = simple_strtoul(e+1, &e, 10); | |
4023 | if (*e && *e != '\n') | |
4024 | return -EINVAL; | |
4025 | dev = MKDEV(major, minor); | |
4026 | if (major != MAJOR(dev) || | |
4027 | minor != MINOR(dev)) | |
4028 | return -EOVERFLOW; | |
4029 | ||
4030 | ||
4031 | if (mddev->persistent) { | |
4032 | rdev = md_import_device(dev, mddev->major_version, | |
4033 | mddev->minor_version); | |
4034 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
4035 | struct md_rdev *rdev0 |
4036 | = list_entry(mddev->disks.next, | |
4037 | struct md_rdev, same_set); | |
6d7ff738 N |
4038 | err = super_types[mddev->major_version] |
4039 | .load_super(rdev, rdev0, mddev->minor_version); | |
4040 | if (err < 0) | |
4041 | goto out; | |
4042 | } | |
c5d79adb N |
4043 | } else if (mddev->external) |
4044 | rdev = md_import_device(dev, -2, -1); | |
4045 | else | |
6d7ff738 N |
4046 | rdev = md_import_device(dev, -1, -1); |
4047 | ||
4048 | if (IS_ERR(rdev)) | |
4049 | return PTR_ERR(rdev); | |
4050 | err = bind_rdev_to_array(rdev, mddev); | |
4051 | out: | |
4052 | if (err) | |
4053 | export_rdev(rdev); | |
4054 | return err ? err : len; | |
4055 | } | |
4056 | ||
4057 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 4058 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 4059 | |
9b1d1dac | 4060 | static ssize_t |
fd01b88c | 4061 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
4062 | { |
4063 | char *end; | |
4064 | unsigned long chunk, end_chunk; | |
4065 | ||
4066 | if (!mddev->bitmap) | |
4067 | goto out; | |
4068 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
4069 | while (*buf) { | |
4070 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
4071 | if (buf == end) break; | |
4072 | if (*end == '-') { /* range */ | |
4073 | buf = end + 1; | |
4074 | end_chunk = simple_strtoul(buf, &end, 0); | |
4075 | if (buf == end) break; | |
4076 | } | |
4077 | if (*end && !isspace(*end)) break; | |
4078 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 4079 | buf = skip_spaces(end); |
9b1d1dac PC |
4080 | } |
4081 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
4082 | out: | |
4083 | return len; | |
4084 | } | |
4085 | ||
4086 | static struct md_sysfs_entry md_bitmap = | |
4087 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
4088 | ||
a35b0d69 | 4089 | static ssize_t |
fd01b88c | 4090 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 4091 | { |
58c0fed4 AN |
4092 | return sprintf(page, "%llu\n", |
4093 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
4094 | } |
4095 | ||
fd01b88c | 4096 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
4097 | |
4098 | static ssize_t | |
fd01b88c | 4099 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
4100 | { |
4101 | /* If array is inactive, we can reduce the component size, but | |
4102 | * not increase it (except from 0). | |
4103 | * If array is active, we can try an on-line resize | |
4104 | */ | |
b522adcd DW |
4105 | sector_t sectors; |
4106 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 4107 | |
58c0fed4 AN |
4108 | if (err < 0) |
4109 | return err; | |
a35b0d69 | 4110 | if (mddev->pers) { |
58c0fed4 | 4111 | err = update_size(mddev, sectors); |
850b2b42 | 4112 | md_update_sb(mddev, 1); |
a35b0d69 | 4113 | } else { |
58c0fed4 AN |
4114 | if (mddev->dev_sectors == 0 || |
4115 | mddev->dev_sectors > sectors) | |
4116 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
4117 | else |
4118 | err = -ENOSPC; | |
4119 | } | |
4120 | return err ? err : len; | |
4121 | } | |
4122 | ||
4123 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 4124 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 4125 | |
8bb93aac | 4126 | |
83f0d77a | 4127 | /* Metadata version. |
e691063a N |
4128 | * This is one of |
4129 | * 'none' for arrays with no metadata (good luck...) | |
4130 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
4131 | * or N.M for internally known formats |
4132 | */ | |
4133 | static ssize_t | |
fd01b88c | 4134 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
4135 | { |
4136 | if (mddev->persistent) | |
4137 | return sprintf(page, "%d.%d\n", | |
4138 | mddev->major_version, mddev->minor_version); | |
e691063a N |
4139 | else if (mddev->external) |
4140 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
4141 | else |
4142 | return sprintf(page, "none\n"); | |
4143 | } | |
4144 | ||
4145 | static ssize_t | |
fd01b88c | 4146 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
4147 | { |
4148 | int major, minor; | |
4149 | char *e; | |
ea43ddd8 N |
4150 | /* Changing the details of 'external' metadata is |
4151 | * always permitted. Otherwise there must be | |
4152 | * no devices attached to the array. | |
4153 | */ | |
4154 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
4155 | ; | |
4156 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
4157 | return -EBUSY; |
4158 | ||
4159 | if (cmd_match(buf, "none")) { | |
4160 | mddev->persistent = 0; | |
e691063a N |
4161 | mddev->external = 0; |
4162 | mddev->major_version = 0; | |
4163 | mddev->minor_version = 90; | |
4164 | return len; | |
4165 | } | |
4166 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4167 | size_t namelen = len-9; |
e691063a N |
4168 | if (namelen >= sizeof(mddev->metadata_type)) |
4169 | namelen = sizeof(mddev->metadata_type)-1; | |
4170 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4171 | mddev->metadata_type[namelen] = 0; | |
4172 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4173 | mddev->metadata_type[--namelen] = 0; | |
4174 | mddev->persistent = 0; | |
4175 | mddev->external = 1; | |
8bb93aac N |
4176 | mddev->major_version = 0; |
4177 | mddev->minor_version = 90; | |
4178 | return len; | |
4179 | } | |
4180 | major = simple_strtoul(buf, &e, 10); | |
4181 | if (e==buf || *e != '.') | |
4182 | return -EINVAL; | |
4183 | buf = e+1; | |
4184 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4185 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 4186 | return -EINVAL; |
50511da3 | 4187 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
4188 | return -ENOENT; |
4189 | mddev->major_version = major; | |
4190 | mddev->minor_version = minor; | |
4191 | mddev->persistent = 1; | |
e691063a | 4192 | mddev->external = 0; |
8bb93aac N |
4193 | return len; |
4194 | } | |
4195 | ||
4196 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 4197 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4198 | |
24dd469d | 4199 | static ssize_t |
fd01b88c | 4200 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4201 | { |
7eec314d | 4202 | char *type = "idle"; |
b6a9ce68 N |
4203 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
4204 | type = "frozen"; | |
4205 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 4206 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
4207 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4208 | type = "reshape"; | |
4209 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
4210 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
4211 | type = "resync"; | |
4212 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
4213 | type = "check"; | |
4214 | else | |
4215 | type = "repair"; | |
72a23c21 | 4216 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
4217 | type = "recover"; |
4218 | } | |
4219 | return sprintf(page, "%s\n", type); | |
4220 | } | |
4221 | ||
4222 | static ssize_t | |
fd01b88c | 4223 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4224 | { |
7eec314d N |
4225 | if (!mddev->pers || !mddev->pers->sync_request) |
4226 | return -EINVAL; | |
4227 | ||
b6a9ce68 N |
4228 | if (cmd_match(page, "frozen")) |
4229 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4230 | else | |
4231 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4232 | ||
4233 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
4234 | if (mddev->sync_thread) { |
4235 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
a91d5ac0 | 4236 | md_reap_sync_thread(mddev); |
7eec314d | 4237 | } |
03c902e1 N |
4238 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4239 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4240 | return -EBUSY; |
72a23c21 NB |
4241 | else if (cmd_match(page, "resync")) |
4242 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4243 | else if (cmd_match(page, "recover")) { | |
4244 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4245 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4246 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4247 | int err; |
4248 | if (mddev->pers->start_reshape == NULL) | |
4249 | return -EINVAL; | |
4250 | err = mddev->pers->start_reshape(mddev); | |
4251 | if (err) | |
4252 | return err; | |
a99ac971 | 4253 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4254 | } else { |
bce74dac | 4255 | if (cmd_match(page, "check")) |
7eec314d | 4256 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4257 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4258 | return -EINVAL; |
4259 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4260 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4261 | } |
48c26ddc N |
4262 | if (mddev->ro == 2) { |
4263 | /* A write to sync_action is enough to justify | |
4264 | * canceling read-auto mode | |
4265 | */ | |
4266 | mddev->ro = 0; | |
4267 | md_wakeup_thread(mddev->sync_thread); | |
4268 | } | |
03c902e1 | 4269 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4270 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4271 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4272 | return len; |
4273 | } | |
4274 | ||
9d88883e | 4275 | static ssize_t |
fd01b88c | 4276 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4277 | { |
4278 | return sprintf(page, "%llu\n", | |
7f7583d4 JM |
4279 | (unsigned long long) |
4280 | atomic64_read(&mddev->resync_mismatches)); | |
9d88883e N |
4281 | } |
4282 | ||
80ca3a44 N |
4283 | static struct md_sysfs_entry md_scan_mode = |
4284 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 4285 | |
96de1e66 | 4286 | |
80ca3a44 | 4287 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4288 | |
88202a0c | 4289 | static ssize_t |
fd01b88c | 4290 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4291 | { |
4292 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4293 | mddev->sync_speed_min ? "local": "system"); | |
4294 | } | |
4295 | ||
4296 | static ssize_t | |
fd01b88c | 4297 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4298 | { |
4299 | int min; | |
4300 | char *e; | |
4301 | if (strncmp(buf, "system", 6)==0) { | |
4302 | mddev->sync_speed_min = 0; | |
4303 | return len; | |
4304 | } | |
4305 | min = simple_strtoul(buf, &e, 10); | |
4306 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4307 | return -EINVAL; | |
4308 | mddev->sync_speed_min = min; | |
4309 | return len; | |
4310 | } | |
4311 | ||
4312 | static struct md_sysfs_entry md_sync_min = | |
4313 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4314 | ||
4315 | static ssize_t | |
fd01b88c | 4316 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4317 | { |
4318 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4319 | mddev->sync_speed_max ? "local": "system"); | |
4320 | } | |
4321 | ||
4322 | static ssize_t | |
fd01b88c | 4323 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4324 | { |
4325 | int max; | |
4326 | char *e; | |
4327 | if (strncmp(buf, "system", 6)==0) { | |
4328 | mddev->sync_speed_max = 0; | |
4329 | return len; | |
4330 | } | |
4331 | max = simple_strtoul(buf, &e, 10); | |
4332 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4333 | return -EINVAL; | |
4334 | mddev->sync_speed_max = max; | |
4335 | return len; | |
4336 | } | |
4337 | ||
4338 | static struct md_sysfs_entry md_sync_max = | |
4339 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4340 | ||
d7f3d291 | 4341 | static ssize_t |
fd01b88c | 4342 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4343 | { |
4344 | return sprintf(page, "%d\n", mddev->degraded); | |
4345 | } | |
4346 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4347 | |
90b08710 | 4348 | static ssize_t |
fd01b88c | 4349 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4350 | { |
4351 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4352 | } | |
4353 | ||
4354 | static ssize_t | |
fd01b88c | 4355 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4356 | { |
4357 | long n; | |
4358 | ||
4359 | if (strict_strtol(buf, 10, &n)) | |
4360 | return -EINVAL; | |
4361 | ||
4362 | if (n != 0 && n != 1) | |
4363 | return -EINVAL; | |
4364 | ||
4365 | mddev->parallel_resync = n; | |
4366 | ||
4367 | if (mddev->sync_thread) | |
4368 | wake_up(&resync_wait); | |
4369 | ||
4370 | return len; | |
4371 | } | |
4372 | ||
4373 | /* force parallel resync, even with shared block devices */ | |
4374 | static struct md_sysfs_entry md_sync_force_parallel = | |
4375 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4376 | sync_force_parallel_show, sync_force_parallel_store); | |
4377 | ||
88202a0c | 4378 | static ssize_t |
fd01b88c | 4379 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4380 | { |
4381 | unsigned long resync, dt, db; | |
d1a7c503 N |
4382 | if (mddev->curr_resync == 0) |
4383 | return sprintf(page, "none\n"); | |
9687a60c AN |
4384 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4385 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4386 | if (!dt) dt++; |
9687a60c AN |
4387 | db = resync - mddev->resync_mark_cnt; |
4388 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4389 | } |
4390 | ||
80ca3a44 | 4391 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4392 | |
4393 | static ssize_t | |
fd01b88c | 4394 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4395 | { |
13ae864b | 4396 | unsigned long long max_sectors, resync; |
88202a0c | 4397 | |
acb180b0 N |
4398 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4399 | return sprintf(page, "none\n"); | |
4400 | ||
72f36d59 N |
4401 | if (mddev->curr_resync == 1 || |
4402 | mddev->curr_resync == 2) | |
4403 | return sprintf(page, "delayed\n"); | |
4404 | ||
c804cdec N |
4405 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4406 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4407 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4408 | else |
58c0fed4 | 4409 | max_sectors = mddev->dev_sectors; |
88202a0c | 4410 | |
acb180b0 | 4411 | resync = mddev->curr_resync_completed; |
13ae864b | 4412 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4413 | } |
4414 | ||
80ca3a44 | 4415 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4416 | |
5e96ee65 | 4417 | static ssize_t |
fd01b88c | 4418 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4419 | { |
4420 | return sprintf(page, "%llu\n", | |
4421 | (unsigned long long)mddev->resync_min); | |
4422 | } | |
4423 | static ssize_t | |
fd01b88c | 4424 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4425 | { |
4426 | unsigned long long min; | |
4427 | if (strict_strtoull(buf, 10, &min)) | |
4428 | return -EINVAL; | |
4429 | if (min > mddev->resync_max) | |
4430 | return -EINVAL; | |
4431 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4432 | return -EBUSY; | |
4433 | ||
4434 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4435 | if (mddev->chunk_sectors) { |
2ac06c33 | 4436 | sector_t temp = min; |
9d8f0363 | 4437 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4438 | return -EINVAL; |
4439 | } | |
4440 | mddev->resync_min = min; | |
4441 | ||
4442 | return len; | |
4443 | } | |
4444 | ||
4445 | static struct md_sysfs_entry md_min_sync = | |
4446 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4447 | ||
c6207277 | 4448 | static ssize_t |
fd01b88c | 4449 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4450 | { |
4451 | if (mddev->resync_max == MaxSector) | |
4452 | return sprintf(page, "max\n"); | |
4453 | else | |
4454 | return sprintf(page, "%llu\n", | |
4455 | (unsigned long long)mddev->resync_max); | |
4456 | } | |
4457 | static ssize_t | |
fd01b88c | 4458 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 N |
4459 | { |
4460 | if (strncmp(buf, "max", 3) == 0) | |
4461 | mddev->resync_max = MaxSector; | |
4462 | else { | |
5e96ee65 NB |
4463 | unsigned long long max; |
4464 | if (strict_strtoull(buf, 10, &max)) | |
4465 | return -EINVAL; | |
4466 | if (max < mddev->resync_min) | |
c6207277 N |
4467 | return -EINVAL; |
4468 | if (max < mddev->resync_max && | |
4d484a4a | 4469 | mddev->ro == 0 && |
c6207277 N |
4470 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4471 | return -EBUSY; | |
4472 | ||
4473 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4474 | if (mddev->chunk_sectors) { |
2ac06c33 | 4475 | sector_t temp = max; |
9d8f0363 | 4476 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4477 | return -EINVAL; |
4478 | } | |
4479 | mddev->resync_max = max; | |
4480 | } | |
4481 | wake_up(&mddev->recovery_wait); | |
4482 | return len; | |
4483 | } | |
4484 | ||
4485 | static struct md_sysfs_entry md_max_sync = | |
4486 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4487 | ||
e464eafd | 4488 | static ssize_t |
fd01b88c | 4489 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4490 | { |
4491 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4492 | } | |
4493 | ||
4494 | static ssize_t | |
fd01b88c | 4495 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4496 | { |
4497 | char *e; | |
4498 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4499 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4500 | |
b8d966ef N |
4501 | if (mddev->pers == NULL || |
4502 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4503 | return -EINVAL; |
4504 | if (buf == e || (*e && *e != '\n')) | |
4505 | return -EINVAL; | |
23ddff37 N |
4506 | |
4507 | mddev->suspend_lo = new; | |
4508 | if (new >= old) | |
4509 | /* Shrinking suspended region */ | |
e464eafd | 4510 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4511 | else { |
4512 | /* Expanding suspended region - need to wait */ | |
4513 | mddev->pers->quiesce(mddev, 1); | |
4514 | mddev->pers->quiesce(mddev, 0); | |
4515 | } | |
4516 | return len; | |
e464eafd N |
4517 | } |
4518 | static struct md_sysfs_entry md_suspend_lo = | |
4519 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4520 | ||
4521 | ||
4522 | static ssize_t | |
fd01b88c | 4523 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4524 | { |
4525 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4526 | } | |
4527 | ||
4528 | static ssize_t | |
fd01b88c | 4529 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4530 | { |
4531 | char *e; | |
4532 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4533 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4534 | |
b8d966ef N |
4535 | if (mddev->pers == NULL || |
4536 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4537 | return -EINVAL; |
4538 | if (buf == e || (*e && *e != '\n')) | |
4539 | return -EINVAL; | |
23ddff37 N |
4540 | |
4541 | mddev->suspend_hi = new; | |
4542 | if (new <= old) | |
4543 | /* Shrinking suspended region */ | |
4544 | mddev->pers->quiesce(mddev, 2); | |
4545 | else { | |
4546 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4547 | mddev->pers->quiesce(mddev, 1); |
4548 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4549 | } |
4550 | return len; | |
e464eafd N |
4551 | } |
4552 | static struct md_sysfs_entry md_suspend_hi = | |
4553 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4554 | ||
08a02ecd | 4555 | static ssize_t |
fd01b88c | 4556 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4557 | { |
4558 | if (mddev->reshape_position != MaxSector) | |
4559 | return sprintf(page, "%llu\n", | |
4560 | (unsigned long long)mddev->reshape_position); | |
4561 | strcpy(page, "none\n"); | |
4562 | return 5; | |
4563 | } | |
4564 | ||
4565 | static ssize_t | |
fd01b88c | 4566 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4567 | { |
c6563a8c | 4568 | struct md_rdev *rdev; |
08a02ecd N |
4569 | char *e; |
4570 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4571 | if (mddev->pers) | |
4572 | return -EBUSY; | |
4573 | if (buf == e || (*e && *e != '\n')) | |
4574 | return -EINVAL; | |
4575 | mddev->reshape_position = new; | |
4576 | mddev->delta_disks = 0; | |
2c810cdd | 4577 | mddev->reshape_backwards = 0; |
08a02ecd N |
4578 | mddev->new_level = mddev->level; |
4579 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4580 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4581 | rdev_for_each(rdev, mddev) |
4582 | rdev->new_data_offset = rdev->data_offset; | |
08a02ecd N |
4583 | return len; |
4584 | } | |
4585 | ||
4586 | static struct md_sysfs_entry md_reshape_position = | |
4587 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4588 | reshape_position_store); | |
4589 | ||
2c810cdd N |
4590 | static ssize_t |
4591 | reshape_direction_show(struct mddev *mddev, char *page) | |
4592 | { | |
4593 | return sprintf(page, "%s\n", | |
4594 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4595 | } | |
4596 | ||
4597 | static ssize_t | |
4598 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4599 | { | |
4600 | int backwards = 0; | |
4601 | if (cmd_match(buf, "forwards")) | |
4602 | backwards = 0; | |
4603 | else if (cmd_match(buf, "backwards")) | |
4604 | backwards = 1; | |
4605 | else | |
4606 | return -EINVAL; | |
4607 | if (mddev->reshape_backwards == backwards) | |
4608 | return len; | |
4609 | ||
4610 | /* check if we are allowed to change */ | |
4611 | if (mddev->delta_disks) | |
4612 | return -EBUSY; | |
4613 | ||
4614 | if (mddev->persistent && | |
4615 | mddev->major_version == 0) | |
4616 | return -EINVAL; | |
4617 | ||
4618 | mddev->reshape_backwards = backwards; | |
4619 | return len; | |
4620 | } | |
4621 | ||
4622 | static struct md_sysfs_entry md_reshape_direction = | |
4623 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4624 | reshape_direction_store); | |
4625 | ||
b522adcd | 4626 | static ssize_t |
fd01b88c | 4627 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4628 | { |
4629 | if (mddev->external_size) | |
4630 | return sprintf(page, "%llu\n", | |
4631 | (unsigned long long)mddev->array_sectors/2); | |
4632 | else | |
4633 | return sprintf(page, "default\n"); | |
4634 | } | |
4635 | ||
4636 | static ssize_t | |
fd01b88c | 4637 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4638 | { |
4639 | sector_t sectors; | |
4640 | ||
4641 | if (strncmp(buf, "default", 7) == 0) { | |
4642 | if (mddev->pers) | |
4643 | sectors = mddev->pers->size(mddev, 0, 0); | |
4644 | else | |
4645 | sectors = mddev->array_sectors; | |
4646 | ||
4647 | mddev->external_size = 0; | |
4648 | } else { | |
4649 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4650 | return -EINVAL; | |
4651 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4652 | return -E2BIG; |
b522adcd DW |
4653 | |
4654 | mddev->external_size = 1; | |
4655 | } | |
4656 | ||
4657 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4658 | if (mddev->pers) { |
4659 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4660 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4661 | } |
b522adcd DW |
4662 | return len; |
4663 | } | |
4664 | ||
4665 | static struct md_sysfs_entry md_array_size = | |
4666 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4667 | array_size_store); | |
e464eafd | 4668 | |
eae1701f N |
4669 | static struct attribute *md_default_attrs[] = { |
4670 | &md_level.attr, | |
d4dbd025 | 4671 | &md_layout.attr, |
eae1701f | 4672 | &md_raid_disks.attr, |
3b34380a | 4673 | &md_chunk_size.attr, |
a35b0d69 | 4674 | &md_size.attr, |
a94213b1 | 4675 | &md_resync_start.attr, |
8bb93aac | 4676 | &md_metadata.attr, |
6d7ff738 | 4677 | &md_new_device.attr, |
16f17b39 | 4678 | &md_safe_delay.attr, |
9e653b63 | 4679 | &md_array_state.attr, |
08a02ecd | 4680 | &md_reshape_position.attr, |
2c810cdd | 4681 | &md_reshape_direction.attr, |
b522adcd | 4682 | &md_array_size.attr, |
1e50915f | 4683 | &max_corr_read_errors.attr, |
411036fa N |
4684 | NULL, |
4685 | }; | |
4686 | ||
4687 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4688 | &md_scan_mode.attr, |
9d88883e | 4689 | &md_mismatches.attr, |
88202a0c N |
4690 | &md_sync_min.attr, |
4691 | &md_sync_max.attr, | |
4692 | &md_sync_speed.attr, | |
90b08710 | 4693 | &md_sync_force_parallel.attr, |
88202a0c | 4694 | &md_sync_completed.attr, |
5e96ee65 | 4695 | &md_min_sync.attr, |
c6207277 | 4696 | &md_max_sync.attr, |
e464eafd N |
4697 | &md_suspend_lo.attr, |
4698 | &md_suspend_hi.attr, | |
9b1d1dac | 4699 | &md_bitmap.attr, |
d7f3d291 | 4700 | &md_degraded.attr, |
eae1701f N |
4701 | NULL, |
4702 | }; | |
411036fa N |
4703 | static struct attribute_group md_redundancy_group = { |
4704 | .name = NULL, | |
4705 | .attrs = md_redundancy_attrs, | |
4706 | }; | |
4707 | ||
eae1701f N |
4708 | |
4709 | static ssize_t | |
4710 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4711 | { | |
4712 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4713 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4714 | ssize_t rv; |
eae1701f N |
4715 | |
4716 | if (!entry->show) | |
4717 | return -EIO; | |
af8a2434 N |
4718 | spin_lock(&all_mddevs_lock); |
4719 | if (list_empty(&mddev->all_mddevs)) { | |
4720 | spin_unlock(&all_mddevs_lock); | |
4721 | return -EBUSY; | |
4722 | } | |
4723 | mddev_get(mddev); | |
4724 | spin_unlock(&all_mddevs_lock); | |
4725 | ||
5dc5cf7d IM |
4726 | rv = mddev_lock(mddev); |
4727 | if (!rv) { | |
4728 | rv = entry->show(mddev, page); | |
4729 | mddev_unlock(mddev); | |
4730 | } | |
af8a2434 | 4731 | mddev_put(mddev); |
96de1e66 | 4732 | return rv; |
eae1701f N |
4733 | } |
4734 | ||
4735 | static ssize_t | |
4736 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4737 | const char *page, size_t length) | |
4738 | { | |
4739 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4740 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4741 | ssize_t rv; |
eae1701f N |
4742 | |
4743 | if (!entry->store) | |
4744 | return -EIO; | |
67463acb N |
4745 | if (!capable(CAP_SYS_ADMIN)) |
4746 | return -EACCES; | |
af8a2434 N |
4747 | spin_lock(&all_mddevs_lock); |
4748 | if (list_empty(&mddev->all_mddevs)) { | |
4749 | spin_unlock(&all_mddevs_lock); | |
4750 | return -EBUSY; | |
4751 | } | |
4752 | mddev_get(mddev); | |
4753 | spin_unlock(&all_mddevs_lock); | |
a7a3f08d N |
4754 | if (entry->store == new_dev_store) |
4755 | flush_workqueue(md_misc_wq); | |
5dc5cf7d IM |
4756 | rv = mddev_lock(mddev); |
4757 | if (!rv) { | |
4758 | rv = entry->store(mddev, page, length); | |
4759 | mddev_unlock(mddev); | |
4760 | } | |
af8a2434 | 4761 | mddev_put(mddev); |
96de1e66 | 4762 | return rv; |
eae1701f N |
4763 | } |
4764 | ||
4765 | static void md_free(struct kobject *ko) | |
4766 | { | |
fd01b88c | 4767 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4768 | |
4769 | if (mddev->sysfs_state) | |
4770 | sysfs_put(mddev->sysfs_state); | |
4771 | ||
4772 | if (mddev->gendisk) { | |
4773 | del_gendisk(mddev->gendisk); | |
4774 | put_disk(mddev->gendisk); | |
4775 | } | |
4776 | if (mddev->queue) | |
4777 | blk_cleanup_queue(mddev->queue); | |
4778 | ||
eae1701f N |
4779 | kfree(mddev); |
4780 | } | |
4781 | ||
52cf25d0 | 4782 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4783 | .show = md_attr_show, |
4784 | .store = md_attr_store, | |
4785 | }; | |
4786 | static struct kobj_type md_ktype = { | |
4787 | .release = md_free, | |
4788 | .sysfs_ops = &md_sysfs_ops, | |
4789 | .default_attrs = md_default_attrs, | |
4790 | }; | |
4791 | ||
1da177e4 LT |
4792 | int mdp_major = 0; |
4793 | ||
5fd3a17e DW |
4794 | static void mddev_delayed_delete(struct work_struct *ws) |
4795 | { | |
fd01b88c | 4796 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4797 | |
43a70507 | 4798 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4799 | kobject_del(&mddev->kobj); |
4800 | kobject_put(&mddev->kobj); | |
4801 | } | |
4802 | ||
efeb53c0 | 4803 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4804 | { |
48c9c27b | 4805 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4806 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4807 | struct gendisk *disk; |
efeb53c0 N |
4808 | int partitioned; |
4809 | int shift; | |
4810 | int unit; | |
3830c62f | 4811 | int error; |
1da177e4 LT |
4812 | |
4813 | if (!mddev) | |
efeb53c0 N |
4814 | return -ENODEV; |
4815 | ||
4816 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4817 | shift = partitioned ? MdpMinorShift : 0; | |
4818 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4819 | |
e804ac78 TH |
4820 | /* wait for any previous instance of this device to be |
4821 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4822 | */ |
e804ac78 | 4823 | flush_workqueue(md_misc_wq); |
d3374825 | 4824 | |
48c9c27b | 4825 | mutex_lock(&disks_mutex); |
0909dc44 N |
4826 | error = -EEXIST; |
4827 | if (mddev->gendisk) | |
4828 | goto abort; | |
efeb53c0 N |
4829 | |
4830 | if (name) { | |
4831 | /* Need to ensure that 'name' is not a duplicate. | |
4832 | */ | |
fd01b88c | 4833 | struct mddev *mddev2; |
efeb53c0 N |
4834 | spin_lock(&all_mddevs_lock); |
4835 | ||
4836 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4837 | if (mddev2->gendisk && | |
4838 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4839 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4840 | goto abort; |
efeb53c0 N |
4841 | } |
4842 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4843 | } |
8b765398 | 4844 | |
0909dc44 | 4845 | error = -ENOMEM; |
8b765398 | 4846 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4847 | if (!mddev->queue) |
4848 | goto abort; | |
409c57f3 N |
4849 | mddev->queue->queuedata = mddev; |
4850 | ||
409c57f3 | 4851 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 4852 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 4853 | |
1da177e4 LT |
4854 | disk = alloc_disk(1 << shift); |
4855 | if (!disk) { | |
8b765398 N |
4856 | blk_cleanup_queue(mddev->queue); |
4857 | mddev->queue = NULL; | |
0909dc44 | 4858 | goto abort; |
1da177e4 | 4859 | } |
efeb53c0 | 4860 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4861 | disk->first_minor = unit << shift; |
efeb53c0 N |
4862 | if (name) |
4863 | strcpy(disk->disk_name, name); | |
4864 | else if (partitioned) | |
1da177e4 | 4865 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4866 | else |
1da177e4 | 4867 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4868 | disk->fops = &md_fops; |
4869 | disk->private_data = mddev; | |
4870 | disk->queue = mddev->queue; | |
b0140891 | 4871 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4872 | /* Allow extended partitions. This makes the |
d3374825 | 4873 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4874 | * remove it now. |
4875 | */ | |
4876 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4877 | mddev->gendisk = disk; |
b0140891 N |
4878 | /* As soon as we call add_disk(), another thread could get |
4879 | * through to md_open, so make sure it doesn't get too far | |
4880 | */ | |
4881 | mutex_lock(&mddev->open_mutex); | |
4882 | add_disk(disk); | |
4883 | ||
ed9e1982 TH |
4884 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4885 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4886 | if (error) { |
4887 | /* This isn't possible, but as kobject_init_and_add is marked | |
4888 | * __must_check, we must do something with the result | |
4889 | */ | |
5e55e2f5 N |
4890 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4891 | disk->disk_name); | |
0909dc44 N |
4892 | error = 0; |
4893 | } | |
00bcb4ac N |
4894 | if (mddev->kobj.sd && |
4895 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4896 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4897 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4898 | abort: |
4899 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4900 | if (!error && mddev->kobj.sd) { |
3830c62f | 4901 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4902 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4903 | } |
d3374825 | 4904 | mddev_put(mddev); |
0909dc44 | 4905 | return error; |
efeb53c0 N |
4906 | } |
4907 | ||
4908 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4909 | { | |
4910 | md_alloc(dev, NULL); | |
1da177e4 LT |
4911 | return NULL; |
4912 | } | |
4913 | ||
efeb53c0 N |
4914 | static int add_named_array(const char *val, struct kernel_param *kp) |
4915 | { | |
4916 | /* val must be "md_*" where * is not all digits. | |
4917 | * We allocate an array with a large free minor number, and | |
4918 | * set the name to val. val must not already be an active name. | |
4919 | */ | |
4920 | int len = strlen(val); | |
4921 | char buf[DISK_NAME_LEN]; | |
4922 | ||
4923 | while (len && val[len-1] == '\n') | |
4924 | len--; | |
4925 | if (len >= DISK_NAME_LEN) | |
4926 | return -E2BIG; | |
4927 | strlcpy(buf, val, len+1); | |
4928 | if (strncmp(buf, "md_", 3) != 0) | |
4929 | return -EINVAL; | |
4930 | return md_alloc(0, buf); | |
4931 | } | |
4932 | ||
1da177e4 LT |
4933 | static void md_safemode_timeout(unsigned long data) |
4934 | { | |
fd01b88c | 4935 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 4936 | |
0fd62b86 NB |
4937 | if (!atomic_read(&mddev->writes_pending)) { |
4938 | mddev->safemode = 1; | |
4939 | if (mddev->external) | |
00bcb4ac | 4940 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4941 | } |
1da177e4 LT |
4942 | md_wakeup_thread(mddev->thread); |
4943 | } | |
4944 | ||
6ff8d8ec | 4945 | static int start_dirty_degraded; |
1da177e4 | 4946 | |
fd01b88c | 4947 | int md_run(struct mddev *mddev) |
1da177e4 | 4948 | { |
2604b703 | 4949 | int err; |
3cb03002 | 4950 | struct md_rdev *rdev; |
84fc4b56 | 4951 | struct md_personality *pers; |
1da177e4 | 4952 | |
a757e64c N |
4953 | if (list_empty(&mddev->disks)) |
4954 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4955 | return -EINVAL; |
1da177e4 LT |
4956 | |
4957 | if (mddev->pers) | |
4958 | return -EBUSY; | |
bb4f1e9d N |
4959 | /* Cannot run until previous stop completes properly */ |
4960 | if (mddev->sysfs_active) | |
4961 | return -EBUSY; | |
b6eb127d | 4962 | |
1da177e4 LT |
4963 | /* |
4964 | * Analyze all RAID superblock(s) | |
4965 | */ | |
1ec4a939 N |
4966 | if (!mddev->raid_disks) { |
4967 | if (!mddev->persistent) | |
4968 | return -EINVAL; | |
a757e64c | 4969 | analyze_sbs(mddev); |
1ec4a939 | 4970 | } |
1da177e4 | 4971 | |
d9d166c2 N |
4972 | if (mddev->level != LEVEL_NONE) |
4973 | request_module("md-level-%d", mddev->level); | |
4974 | else if (mddev->clevel[0]) | |
4975 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4976 | |
4977 | /* | |
4978 | * Drop all container device buffers, from now on | |
4979 | * the only valid external interface is through the md | |
4980 | * device. | |
1da177e4 | 4981 | */ |
dafb20fa | 4982 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 4983 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4984 | continue; |
4985 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4986 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4987 | |
4988 | /* perform some consistency tests on the device. | |
4989 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4990 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4991 | */ |
a6ff7e08 JB |
4992 | if (rdev->meta_bdev) { |
4993 | /* Nothing to check */; | |
4994 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4995 | if (mddev->dev_sectors && |
4996 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4997 | > rdev->sb_start) { |
f0d76d70 N |
4998 | printk("md: %s: data overlaps metadata\n", |
4999 | mdname(mddev)); | |
5000 | return -EINVAL; | |
5001 | } | |
5002 | } else { | |
0f420358 | 5003 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
5004 | > rdev->data_offset) { |
5005 | printk("md: %s: metadata overlaps data\n", | |
5006 | mdname(mddev)); | |
5007 | return -EINVAL; | |
5008 | } | |
5009 | } | |
00bcb4ac | 5010 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
5011 | } |
5012 | ||
a167f663 | 5013 | if (mddev->bio_set == NULL) |
395c72a7 | 5014 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, 0); |
a167f663 | 5015 | |
1da177e4 | 5016 | spin_lock(&pers_lock); |
d9d166c2 | 5017 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 5018 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 5019 | spin_unlock(&pers_lock); |
d9d166c2 N |
5020 | if (mddev->level != LEVEL_NONE) |
5021 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
5022 | mddev->level); | |
5023 | else | |
5024 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
5025 | mddev->clevel); | |
1da177e4 LT |
5026 | return -EINVAL; |
5027 | } | |
2604b703 | 5028 | mddev->pers = pers; |
1da177e4 | 5029 | spin_unlock(&pers_lock); |
34817e8c N |
5030 | if (mddev->level != pers->level) { |
5031 | mddev->level = pers->level; | |
5032 | mddev->new_level = pers->level; | |
5033 | } | |
d9d166c2 | 5034 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 5035 | |
f6705578 | 5036 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 5037 | pers->start_reshape == NULL) { |
f6705578 N |
5038 | /* This personality cannot handle reshaping... */ |
5039 | mddev->pers = NULL; | |
5040 | module_put(pers->owner); | |
5041 | return -EINVAL; | |
5042 | } | |
5043 | ||
7dd5e7c3 N |
5044 | if (pers->sync_request) { |
5045 | /* Warn if this is a potentially silly | |
5046 | * configuration. | |
5047 | */ | |
5048 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5049 | struct md_rdev *rdev2; |
7dd5e7c3 | 5050 | int warned = 0; |
159ec1fc | 5051 | |
dafb20fa N |
5052 | rdev_for_each(rdev, mddev) |
5053 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
5054 | if (rdev < rdev2 && |
5055 | rdev->bdev->bd_contains == | |
5056 | rdev2->bdev->bd_contains) { | |
5057 | printk(KERN_WARNING | |
5058 | "%s: WARNING: %s appears to be" | |
5059 | " on the same physical disk as" | |
5060 | " %s.\n", | |
5061 | mdname(mddev), | |
5062 | bdevname(rdev->bdev,b), | |
5063 | bdevname(rdev2->bdev,b2)); | |
5064 | warned = 1; | |
5065 | } | |
5066 | } | |
159ec1fc | 5067 | |
7dd5e7c3 N |
5068 | if (warned) |
5069 | printk(KERN_WARNING | |
5070 | "True protection against single-disk" | |
5071 | " failure might be compromised.\n"); | |
5072 | } | |
5073 | ||
657390d2 | 5074 | mddev->recovery = 0; |
58c0fed4 AN |
5075 | /* may be over-ridden by personality */ |
5076 | mddev->resync_max_sectors = mddev->dev_sectors; | |
5077 | ||
6ff8d8ec | 5078 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 5079 | |
0f9552b5 | 5080 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
5081 | mddev->ro = 2; /* read-only, but switch on first write */ |
5082 | ||
b15c2e57 | 5083 | err = mddev->pers->run(mddev); |
13e53df3 AN |
5084 | if (err) |
5085 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
5086 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
5087 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
5088 | " but 'external_size' not in effect?\n", __func__); | |
5089 | printk(KERN_ERR | |
5090 | "md: invalid array_size %llu > default size %llu\n", | |
5091 | (unsigned long long)mddev->array_sectors / 2, | |
5092 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
5093 | err = -EINVAL; | |
5094 | mddev->pers->stop(mddev); | |
5095 | } | |
ef99bf48 N |
5096 | if (err == 0 && mddev->pers->sync_request && |
5097 | (mddev->bitmap_info.file || mddev->bitmap_info.offset)) { | |
b15c2e57 N |
5098 | err = bitmap_create(mddev); |
5099 | if (err) { | |
5100 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
5101 | mdname(mddev), err); | |
5102 | mddev->pers->stop(mddev); | |
5103 | } | |
5104 | } | |
1da177e4 | 5105 | if (err) { |
1da177e4 LT |
5106 | module_put(mddev->pers->owner); |
5107 | mddev->pers = NULL; | |
32a7627c N |
5108 | bitmap_destroy(mddev); |
5109 | return err; | |
1da177e4 | 5110 | } |
5e55e2f5 | 5111 | if (mddev->pers->sync_request) { |
00bcb4ac N |
5112 | if (mddev->kobj.sd && |
5113 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
5114 | printk(KERN_WARNING |
5115 | "md: cannot register extra attributes for %s\n", | |
5116 | mdname(mddev)); | |
00bcb4ac | 5117 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 5118 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
5119 | mddev->ro = 0; |
5120 | ||
1da177e4 | 5121 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
5122 | atomic_set(&mddev->max_corr_read_errors, |
5123 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
5124 | mddev->safemode = 0; |
5125 | mddev->safemode_timer.function = md_safemode_timeout; | |
5126 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 5127 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 5128 | mddev->in_sync = 1; |
0ca69886 N |
5129 | smp_wmb(); |
5130 | mddev->ready = 1; | |
dafb20fa | 5131 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5132 | if (rdev->raid_disk >= 0) |
5133 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 5134 | /* failure here is OK */; |
1da177e4 LT |
5135 | |
5136 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5137 | ||
850b2b42 N |
5138 | if (mddev->flags) |
5139 | md_update_sb(mddev, 0); | |
1da177e4 | 5140 | |
d7603b7e | 5141 | md_new_event(mddev); |
00bcb4ac N |
5142 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
5143 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 5144 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
5145 | return 0; |
5146 | } | |
390ee602 | 5147 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 5148 | |
fd01b88c | 5149 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
5150 | { |
5151 | int err; | |
5152 | ||
5153 | err = md_run(mddev); | |
5154 | if (err) | |
5155 | goto out; | |
69e51b44 N |
5156 | err = bitmap_load(mddev); |
5157 | if (err) { | |
5158 | bitmap_destroy(mddev); | |
5159 | goto out; | |
5160 | } | |
0fd018af JB |
5161 | |
5162 | md_wakeup_thread(mddev->thread); | |
5163 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5164 | ||
fe60b014 N |
5165 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5166 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5167 | mddev->changed = 1; |
fe60b014 N |
5168 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5169 | out: | |
5170 | return err; | |
5171 | } | |
5172 | ||
fd01b88c | 5173 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5174 | { |
5175 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5176 | |
80fab1d7 | 5177 | /* Complain if it has no devices */ |
1da177e4 | 5178 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5179 | return -ENXIO; |
5180 | if (!mddev->pers) | |
5181 | return -EINVAL; | |
5182 | if (!mddev->ro) | |
5183 | return -EBUSY; | |
5184 | mddev->safemode = 0; | |
5185 | mddev->ro = 0; | |
5186 | set_disk_ro(disk, 0); | |
5187 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5188 | mdname(mddev)); | |
5189 | /* Kick recovery or resync if necessary */ | |
5190 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5191 | md_wakeup_thread(mddev->thread); | |
5192 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5193 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5194 | return 0; |
1da177e4 LT |
5195 | } |
5196 | ||
acc55e22 N |
5197 | /* similar to deny_write_access, but accounts for our holding a reference |
5198 | * to the file ourselves */ | |
5199 | static int deny_bitmap_write_access(struct file * file) | |
5200 | { | |
5201 | struct inode *inode = file->f_mapping->host; | |
5202 | ||
5203 | spin_lock(&inode->i_lock); | |
5204 | if (atomic_read(&inode->i_writecount) > 1) { | |
5205 | spin_unlock(&inode->i_lock); | |
5206 | return -ETXTBSY; | |
5207 | } | |
5208 | atomic_set(&inode->i_writecount, -1); | |
5209 | spin_unlock(&inode->i_lock); | |
5210 | ||
5211 | return 0; | |
5212 | } | |
5213 | ||
43a70507 | 5214 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
5215 | { |
5216 | struct inode *inode = file->f_mapping->host; | |
5217 | ||
5218 | spin_lock(&inode->i_lock); | |
5219 | atomic_set(&inode->i_writecount, 1); | |
5220 | spin_unlock(&inode->i_lock); | |
5221 | } | |
5222 | ||
fd01b88c | 5223 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5224 | { |
5225 | mddev->array_sectors = 0; | |
5226 | mddev->external_size = 0; | |
5227 | mddev->dev_sectors = 0; | |
5228 | mddev->raid_disks = 0; | |
5229 | mddev->recovery_cp = 0; | |
5230 | mddev->resync_min = 0; | |
5231 | mddev->resync_max = MaxSector; | |
5232 | mddev->reshape_position = MaxSector; | |
5233 | mddev->external = 0; | |
5234 | mddev->persistent = 0; | |
5235 | mddev->level = LEVEL_NONE; | |
5236 | mddev->clevel[0] = 0; | |
5237 | mddev->flags = 0; | |
5238 | mddev->ro = 0; | |
5239 | mddev->metadata_type[0] = 0; | |
5240 | mddev->chunk_sectors = 0; | |
5241 | mddev->ctime = mddev->utime = 0; | |
5242 | mddev->layout = 0; | |
5243 | mddev->max_disks = 0; | |
5244 | mddev->events = 0; | |
a8707c08 | 5245 | mddev->can_decrease_events = 0; |
6177b472 | 5246 | mddev->delta_disks = 0; |
2c810cdd | 5247 | mddev->reshape_backwards = 0; |
6177b472 N |
5248 | mddev->new_level = LEVEL_NONE; |
5249 | mddev->new_layout = 0; | |
5250 | mddev->new_chunk_sectors = 0; | |
5251 | mddev->curr_resync = 0; | |
7f7583d4 | 5252 | atomic64_set(&mddev->resync_mismatches, 0); |
6177b472 N |
5253 | mddev->suspend_lo = mddev->suspend_hi = 0; |
5254 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5255 | mddev->recovery = 0; | |
5256 | mddev->in_sync = 0; | |
f0b4f7e2 | 5257 | mddev->changed = 0; |
6177b472 | 5258 | mddev->degraded = 0; |
6177b472 | 5259 | mddev->safemode = 0; |
050b6615 | 5260 | mddev->merge_check_needed = 0; |
6177b472 N |
5261 | mddev->bitmap_info.offset = 0; |
5262 | mddev->bitmap_info.default_offset = 0; | |
6409bb05 | 5263 | mddev->bitmap_info.default_space = 0; |
6177b472 N |
5264 | mddev->bitmap_info.chunksize = 0; |
5265 | mddev->bitmap_info.daemon_sleep = 0; | |
5266 | mddev->bitmap_info.max_write_behind = 0; | |
5267 | } | |
5268 | ||
fd01b88c | 5269 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 | 5270 | { |
6b6204ee | 5271 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
a047e125 | 5272 | if (mddev->sync_thread) { |
a047e125 | 5273 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
a91d5ac0 | 5274 | md_reap_sync_thread(mddev); |
a047e125 N |
5275 | } |
5276 | ||
5277 | del_timer_sync(&mddev->safemode_timer); | |
5278 | ||
5279 | bitmap_flush(mddev); | |
5280 | md_super_wait(mddev); | |
5281 | ||
b6d428c6 N |
5282 | if (mddev->ro == 0 && |
5283 | (!mddev->in_sync || mddev->flags)) { | |
a047e125 N |
5284 | /* mark array as shutdown cleanly */ |
5285 | mddev->in_sync = 1; | |
5286 | md_update_sb(mddev, 1); | |
5287 | } | |
5288 | } | |
defad61a | 5289 | |
fd01b88c | 5290 | void md_stop_writes(struct mddev *mddev) |
defad61a N |
5291 | { |
5292 | mddev_lock(mddev); | |
5293 | __md_stop_writes(mddev); | |
5294 | mddev_unlock(mddev); | |
5295 | } | |
390ee602 | 5296 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5297 | |
5eff3c43 | 5298 | static void __md_stop(struct mddev *mddev) |
6177b472 | 5299 | { |
0ca69886 | 5300 | mddev->ready = 0; |
6177b472 N |
5301 | mddev->pers->stop(mddev); |
5302 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
5303 | mddev->to_remove = &md_redundancy_group; | |
5304 | module_put(mddev->pers->owner); | |
5305 | mddev->pers = NULL; | |
cca9cf90 | 5306 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5307 | } |
5eff3c43 N |
5308 | |
5309 | void md_stop(struct mddev *mddev) | |
5310 | { | |
5311 | /* stop the array and free an attached data structures. | |
5312 | * This is called from dm-raid | |
5313 | */ | |
5314 | __md_stop(mddev); | |
5315 | bitmap_destroy(mddev); | |
5316 | if (mddev->bio_set) | |
5317 | bioset_free(mddev->bio_set); | |
5318 | } | |
5319 | ||
390ee602 | 5320 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5321 | |
a05b7ea0 | 5322 | static int md_set_readonly(struct mddev *mddev, struct block_device *bdev) |
a4bd82d0 N |
5323 | { |
5324 | int err = 0; | |
5325 | mutex_lock(&mddev->open_mutex); | |
a05b7ea0 | 5326 | if (atomic_read(&mddev->openers) > !!bdev) { |
a4bd82d0 N |
5327 | printk("md: %s still in use.\n",mdname(mddev)); |
5328 | err = -EBUSY; | |
5329 | goto out; | |
5330 | } | |
a05b7ea0 N |
5331 | if (bdev) |
5332 | sync_blockdev(bdev); | |
a4bd82d0 | 5333 | if (mddev->pers) { |
defad61a | 5334 | __md_stop_writes(mddev); |
a4bd82d0 N |
5335 | |
5336 | err = -ENXIO; | |
5337 | if (mddev->ro==1) | |
5338 | goto out; | |
5339 | mddev->ro = 1; | |
5340 | set_disk_ro(mddev->gendisk, 1); | |
5341 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 5342 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
5343 | err = 0; |
5344 | } | |
5345 | out: | |
5346 | mutex_unlock(&mddev->open_mutex); | |
5347 | return err; | |
5348 | } | |
5349 | ||
9e653b63 N |
5350 | /* mode: |
5351 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5352 | * 2 - stop but do not disassemble array |
5353 | */ | |
a05b7ea0 N |
5354 | static int do_md_stop(struct mddev * mddev, int mode, |
5355 | struct block_device *bdev) | |
1da177e4 | 5356 | { |
1da177e4 | 5357 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5358 | struct md_rdev *rdev; |
1da177e4 | 5359 | |
c8c00a69 | 5360 | mutex_lock(&mddev->open_mutex); |
a05b7ea0 | 5361 | if (atomic_read(&mddev->openers) > !!bdev || |
bb4f1e9d | 5362 | mddev->sysfs_active) { |
df5b20cf | 5363 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
5364 | mutex_unlock(&mddev->open_mutex); |
5365 | return -EBUSY; | |
5366 | } | |
a05b7ea0 N |
5367 | if (bdev) |
5368 | /* It is possible IO was issued on some other | |
5369 | * open file which was closed before we took ->open_mutex. | |
5370 | * As that was not the last close __blkdev_put will not | |
5371 | * have called sync_blockdev, so we must. | |
5372 | */ | |
5373 | sync_blockdev(bdev); | |
1da177e4 | 5374 | |
6e17b027 | 5375 | if (mddev->pers) { |
a4bd82d0 N |
5376 | if (mddev->ro) |
5377 | set_disk_ro(disk, 0); | |
409c57f3 | 5378 | |
defad61a | 5379 | __md_stop_writes(mddev); |
5eff3c43 | 5380 | __md_stop(mddev); |
a4bd82d0 | 5381 | mddev->queue->merge_bvec_fn = NULL; |
a4bd82d0 | 5382 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5383 | |
a4bd82d0 | 5384 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5385 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5386 | |
dafb20fa | 5387 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5388 | if (rdev->raid_disk >= 0) |
5389 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5390 | |
a4bd82d0 | 5391 | set_capacity(disk, 0); |
6e17b027 | 5392 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5393 | mddev->changed = 1; |
a4bd82d0 | 5394 | revalidate_disk(disk); |
0d4ca600 | 5395 | |
a4bd82d0 N |
5396 | if (mddev->ro) |
5397 | mddev->ro = 0; | |
6e17b027 N |
5398 | } else |
5399 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5400 | /* |
5401 | * Free resources if final stop | |
5402 | */ | |
9e653b63 | 5403 | if (mode == 0) { |
1da177e4 LT |
5404 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5405 | ||
978f946b | 5406 | bitmap_destroy(mddev); |
c3d9714e N |
5407 | if (mddev->bitmap_info.file) { |
5408 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5409 | fput(mddev->bitmap_info.file); | |
5410 | mddev->bitmap_info.file = NULL; | |
978f946b | 5411 | } |
c3d9714e | 5412 | mddev->bitmap_info.offset = 0; |
978f946b | 5413 | |
1da177e4 LT |
5414 | export_array(mddev); |
5415 | ||
6177b472 | 5416 | md_clean(mddev); |
934d9c23 | 5417 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5418 | if (mddev->hold_active == UNTIL_STOP) |
5419 | mddev->hold_active = 0; | |
a4bd82d0 | 5420 | } |
3f9d99c1 | 5421 | blk_integrity_unregister(disk); |
d7603b7e | 5422 | md_new_event(mddev); |
00bcb4ac | 5423 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5424 | return 0; |
1da177e4 LT |
5425 | } |
5426 | ||
fdee8ae4 | 5427 | #ifndef MODULE |
fd01b88c | 5428 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5429 | { |
3cb03002 | 5430 | struct md_rdev *rdev; |
1da177e4 LT |
5431 | int err; |
5432 | ||
a757e64c | 5433 | if (list_empty(&mddev->disks)) |
1da177e4 | 5434 | return; |
1da177e4 LT |
5435 | |
5436 | printk(KERN_INFO "md: running: "); | |
5437 | ||
dafb20fa | 5438 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5439 | char b[BDEVNAME_SIZE]; |
5440 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5441 | } | |
5442 | printk("\n"); | |
5443 | ||
d710e138 | 5444 | err = do_md_run(mddev); |
1da177e4 LT |
5445 | if (err) { |
5446 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
a05b7ea0 | 5447 | do_md_stop(mddev, 0, NULL); |
1da177e4 LT |
5448 | } |
5449 | } | |
5450 | ||
5451 | /* | |
5452 | * lets try to run arrays based on all disks that have arrived | |
5453 | * until now. (those are in pending_raid_disks) | |
5454 | * | |
5455 | * the method: pick the first pending disk, collect all disks with | |
5456 | * the same UUID, remove all from the pending list and put them into | |
5457 | * the 'same_array' list. Then order this list based on superblock | |
5458 | * update time (freshest comes first), kick out 'old' disks and | |
5459 | * compare superblocks. If everything's fine then run it. | |
5460 | * | |
5461 | * If "unit" is allocated, then bump its reference count | |
5462 | */ | |
5463 | static void autorun_devices(int part) | |
5464 | { | |
3cb03002 | 5465 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5466 | struct mddev *mddev; |
1da177e4 LT |
5467 | char b[BDEVNAME_SIZE]; |
5468 | ||
5469 | printk(KERN_INFO "md: autorun ...\n"); | |
5470 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5471 | int unit; |
1da177e4 | 5472 | dev_t dev; |
ad01c9e3 | 5473 | LIST_HEAD(candidates); |
1da177e4 | 5474 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5475 | struct md_rdev, same_set); |
1da177e4 LT |
5476 | |
5477 | printk(KERN_INFO "md: considering %s ...\n", | |
5478 | bdevname(rdev0->bdev,b)); | |
5479 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5480 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5481 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5482 | printk(KERN_INFO "md: adding %s ...\n", | |
5483 | bdevname(rdev->bdev,b)); | |
5484 | list_move(&rdev->same_set, &candidates); | |
5485 | } | |
5486 | /* | |
5487 | * now we have a set of devices, with all of them having | |
5488 | * mostly sane superblocks. It's time to allocate the | |
5489 | * mddev. | |
5490 | */ | |
e8703fe1 N |
5491 | if (part) { |
5492 | dev = MKDEV(mdp_major, | |
5493 | rdev0->preferred_minor << MdpMinorShift); | |
5494 | unit = MINOR(dev) >> MdpMinorShift; | |
5495 | } else { | |
5496 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5497 | unit = MINOR(dev); | |
5498 | } | |
5499 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5500 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5501 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5502 | break; | |
5503 | } | |
1da177e4 LT |
5504 | |
5505 | md_probe(dev, NULL, NULL); | |
5506 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5507 | if (!mddev || !mddev->gendisk) { |
5508 | if (mddev) | |
5509 | mddev_put(mddev); | |
5510 | printk(KERN_ERR | |
1da177e4 LT |
5511 | "md: cannot allocate memory for md drive.\n"); |
5512 | break; | |
5513 | } | |
5514 | if (mddev_lock(mddev)) | |
5515 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
5516 | mdname(mddev)); | |
5517 | else if (mddev->raid_disks || mddev->major_version | |
5518 | || !list_empty(&mddev->disks)) { | |
5519 | printk(KERN_WARNING | |
5520 | "md: %s already running, cannot run %s\n", | |
5521 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5522 | mddev_unlock(mddev); | |
5523 | } else { | |
5524 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5525 | mddev->persistent = 1; |
159ec1fc | 5526 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5527 | list_del_init(&rdev->same_set); |
5528 | if (bind_rdev_to_array(rdev, mddev)) | |
5529 | export_rdev(rdev); | |
5530 | } | |
5531 | autorun_array(mddev); | |
5532 | mddev_unlock(mddev); | |
5533 | } | |
5534 | /* on success, candidates will be empty, on error | |
5535 | * it won't... | |
5536 | */ | |
159ec1fc | 5537 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5538 | list_del_init(&rdev->same_set); |
1da177e4 | 5539 | export_rdev(rdev); |
4b80991c | 5540 | } |
1da177e4 LT |
5541 | mddev_put(mddev); |
5542 | } | |
5543 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5544 | } | |
fdee8ae4 | 5545 | #endif /* !MODULE */ |
1da177e4 | 5546 | |
1da177e4 LT |
5547 | static int get_version(void __user * arg) |
5548 | { | |
5549 | mdu_version_t ver; | |
5550 | ||
5551 | ver.major = MD_MAJOR_VERSION; | |
5552 | ver.minor = MD_MINOR_VERSION; | |
5553 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5554 | ||
5555 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5556 | return -EFAULT; | |
5557 | ||
5558 | return 0; | |
5559 | } | |
5560 | ||
fd01b88c | 5561 | static int get_array_info(struct mddev * mddev, void __user * arg) |
1da177e4 LT |
5562 | { |
5563 | mdu_array_info_t info; | |
a9f326eb | 5564 | int nr,working,insync,failed,spare; |
3cb03002 | 5565 | struct md_rdev *rdev; |
1da177e4 | 5566 | |
1ca69c4b N |
5567 | nr = working = insync = failed = spare = 0; |
5568 | rcu_read_lock(); | |
5569 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 5570 | nr++; |
b2d444d7 | 5571 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5572 | failed++; |
5573 | else { | |
5574 | working++; | |
b2d444d7 | 5575 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 5576 | insync++; |
1da177e4 LT |
5577 | else |
5578 | spare++; | |
5579 | } | |
5580 | } | |
1ca69c4b | 5581 | rcu_read_unlock(); |
1da177e4 LT |
5582 | |
5583 | info.major_version = mddev->major_version; | |
5584 | info.minor_version = mddev->minor_version; | |
5585 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5586 | info.ctime = mddev->ctime; | |
5587 | info.level = mddev->level; | |
58c0fed4 AN |
5588 | info.size = mddev->dev_sectors / 2; |
5589 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5590 | info.size = -1; |
1da177e4 LT |
5591 | info.nr_disks = nr; |
5592 | info.raid_disks = mddev->raid_disks; | |
5593 | info.md_minor = mddev->md_minor; | |
5594 | info.not_persistent= !mddev->persistent; | |
5595 | ||
5596 | info.utime = mddev->utime; | |
5597 | info.state = 0; | |
5598 | if (mddev->in_sync) | |
5599 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5600 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5601 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5602 | info.active_disks = insync; |
1da177e4 LT |
5603 | info.working_disks = working; |
5604 | info.failed_disks = failed; | |
5605 | info.spare_disks = spare; | |
5606 | ||
5607 | info.layout = mddev->layout; | |
9d8f0363 | 5608 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5609 | |
5610 | if (copy_to_user(arg, &info, sizeof(info))) | |
5611 | return -EFAULT; | |
5612 | ||
5613 | return 0; | |
5614 | } | |
5615 | ||
fd01b88c | 5616 | static int get_bitmap_file(struct mddev * mddev, void __user * arg) |
32a7627c N |
5617 | { |
5618 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5619 | char *ptr, *buf = NULL; | |
5620 | int err = -ENOMEM; | |
5621 | ||
b5470dc5 DW |
5622 | if (md_allow_write(mddev)) |
5623 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5624 | else | |
5625 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5626 | |
32a7627c N |
5627 | if (!file) |
5628 | goto out; | |
5629 | ||
5630 | /* bitmap disabled, zero the first byte and copy out */ | |
1ec885cd | 5631 | if (!mddev->bitmap || !mddev->bitmap->storage.file) { |
32a7627c N |
5632 | file->pathname[0] = '\0'; |
5633 | goto copy_out; | |
5634 | } | |
5635 | ||
5636 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5637 | if (!buf) | |
5638 | goto out; | |
5639 | ||
1ec885cd N |
5640 | ptr = d_path(&mddev->bitmap->storage.file->f_path, |
5641 | buf, sizeof(file->pathname)); | |
6bcfd601 | 5642 | if (IS_ERR(ptr)) |
32a7627c N |
5643 | goto out; |
5644 | ||
5645 | strcpy(file->pathname, ptr); | |
5646 | ||
5647 | copy_out: | |
5648 | err = 0; | |
5649 | if (copy_to_user(arg, file, sizeof(*file))) | |
5650 | err = -EFAULT; | |
5651 | out: | |
5652 | kfree(buf); | |
5653 | kfree(file); | |
5654 | return err; | |
5655 | } | |
5656 | ||
fd01b88c | 5657 | static int get_disk_info(struct mddev * mddev, void __user * arg) |
1da177e4 LT |
5658 | { |
5659 | mdu_disk_info_t info; | |
3cb03002 | 5660 | struct md_rdev *rdev; |
1da177e4 LT |
5661 | |
5662 | if (copy_from_user(&info, arg, sizeof(info))) | |
5663 | return -EFAULT; | |
5664 | ||
1ca69c4b N |
5665 | rcu_read_lock(); |
5666 | rdev = find_rdev_nr_rcu(mddev, info.number); | |
1da177e4 LT |
5667 | if (rdev) { |
5668 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5669 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5670 | info.raid_disk = rdev->raid_disk; | |
5671 | info.state = 0; | |
b2d444d7 | 5672 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5673 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5674 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5675 | info.state |= (1<<MD_DISK_ACTIVE); |
5676 | info.state |= (1<<MD_DISK_SYNC); | |
5677 | } | |
8ddf9efe N |
5678 | if (test_bit(WriteMostly, &rdev->flags)) |
5679 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5680 | } else { |
5681 | info.major = info.minor = 0; | |
5682 | info.raid_disk = -1; | |
5683 | info.state = (1<<MD_DISK_REMOVED); | |
5684 | } | |
1ca69c4b | 5685 | rcu_read_unlock(); |
1da177e4 LT |
5686 | |
5687 | if (copy_to_user(arg, &info, sizeof(info))) | |
5688 | return -EFAULT; | |
5689 | ||
5690 | return 0; | |
5691 | } | |
5692 | ||
fd01b88c | 5693 | static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5694 | { |
5695 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5696 | struct md_rdev *rdev; |
1da177e4 LT |
5697 | dev_t dev = MKDEV(info->major,info->minor); |
5698 | ||
5699 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5700 | return -EOVERFLOW; | |
5701 | ||
5702 | if (!mddev->raid_disks) { | |
5703 | int err; | |
5704 | /* expecting a device which has a superblock */ | |
5705 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5706 | if (IS_ERR(rdev)) { | |
5707 | printk(KERN_WARNING | |
5708 | "md: md_import_device returned %ld\n", | |
5709 | PTR_ERR(rdev)); | |
5710 | return PTR_ERR(rdev); | |
5711 | } | |
5712 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5713 | struct md_rdev *rdev0 |
5714 | = list_entry(mddev->disks.next, | |
5715 | struct md_rdev, same_set); | |
a9f326eb | 5716 | err = super_types[mddev->major_version] |
1da177e4 LT |
5717 | .load_super(rdev, rdev0, mddev->minor_version); |
5718 | if (err < 0) { | |
5719 | printk(KERN_WARNING | |
5720 | "md: %s has different UUID to %s\n", | |
5721 | bdevname(rdev->bdev,b), | |
5722 | bdevname(rdev0->bdev,b2)); | |
5723 | export_rdev(rdev); | |
5724 | return -EINVAL; | |
5725 | } | |
5726 | } | |
5727 | err = bind_rdev_to_array(rdev, mddev); | |
5728 | if (err) | |
5729 | export_rdev(rdev); | |
5730 | return err; | |
5731 | } | |
5732 | ||
5733 | /* | |
5734 | * add_new_disk can be used once the array is assembled | |
5735 | * to add "hot spares". They must already have a superblock | |
5736 | * written | |
5737 | */ | |
5738 | if (mddev->pers) { | |
5739 | int err; | |
5740 | if (!mddev->pers->hot_add_disk) { | |
5741 | printk(KERN_WARNING | |
5742 | "%s: personality does not support diskops!\n", | |
5743 | mdname(mddev)); | |
5744 | return -EINVAL; | |
5745 | } | |
7b1e35f6 N |
5746 | if (mddev->persistent) |
5747 | rdev = md_import_device(dev, mddev->major_version, | |
5748 | mddev->minor_version); | |
5749 | else | |
5750 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5751 | if (IS_ERR(rdev)) { |
5752 | printk(KERN_WARNING | |
5753 | "md: md_import_device returned %ld\n", | |
5754 | PTR_ERR(rdev)); | |
5755 | return PTR_ERR(rdev); | |
5756 | } | |
1a855a06 | 5757 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5758 | if (!mddev->persistent) { |
5759 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5760 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5761 | rdev->raid_disk = info->raid_disk; |
bf572541 N |
5762 | set_bit(In_sync, &rdev->flags); |
5763 | } else | |
41158c7e N |
5764 | rdev->raid_disk = -1; |
5765 | } else | |
5766 | super_types[mddev->major_version]. | |
5767 | validate_super(mddev, rdev); | |
bedd86b7 | 5768 | if ((info->state & (1<<MD_DISK_SYNC)) && |
f4563091 | 5769 | rdev->raid_disk != info->raid_disk) { |
bedd86b7 N |
5770 | /* This was a hot-add request, but events doesn't |
5771 | * match, so reject it. | |
5772 | */ | |
5773 | export_rdev(rdev); | |
5774 | return -EINVAL; | |
5775 | } | |
5776 | ||
1a855a06 N |
5777 | if (test_bit(In_sync, &rdev->flags)) |
5778 | rdev->saved_raid_disk = rdev->raid_disk; | |
5779 | else | |
5780 | rdev->saved_raid_disk = -1; | |
41158c7e | 5781 | |
b2d444d7 | 5782 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5783 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5784 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5785 | else |
5786 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5787 | |
1da177e4 LT |
5788 | rdev->raid_disk = -1; |
5789 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5790 | if (!err && !mddev->pers->hot_remove_disk) { |
5791 | /* If there is hot_add_disk but no hot_remove_disk | |
5792 | * then added disks for geometry changes, | |
5793 | * and should be added immediately. | |
5794 | */ | |
5795 | super_types[mddev->major_version]. | |
5796 | validate_super(mddev, rdev); | |
5797 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5798 | if (err) | |
5799 | unbind_rdev_from_array(rdev); | |
5800 | } | |
1da177e4 LT |
5801 | if (err) |
5802 | export_rdev(rdev); | |
52664732 | 5803 | else |
00bcb4ac | 5804 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5805 | |
7ceb17e8 | 5806 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
72a23c21 NB |
5807 | if (mddev->degraded) |
5808 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5809 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5810 | if (!err) |
5811 | md_new_event(mddev); | |
005eca5e | 5812 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5813 | return err; |
5814 | } | |
5815 | ||
5816 | /* otherwise, add_new_disk is only allowed | |
5817 | * for major_version==0 superblocks | |
5818 | */ | |
5819 | if (mddev->major_version != 0) { | |
5820 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5821 | mdname(mddev)); | |
5822 | return -EINVAL; | |
5823 | } | |
5824 | ||
5825 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5826 | int err; | |
d710e138 | 5827 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5828 | if (IS_ERR(rdev)) { |
5829 | printk(KERN_WARNING | |
5830 | "md: error, md_import_device() returned %ld\n", | |
5831 | PTR_ERR(rdev)); | |
5832 | return PTR_ERR(rdev); | |
5833 | } | |
5834 | rdev->desc_nr = info->number; | |
5835 | if (info->raid_disk < mddev->raid_disks) | |
5836 | rdev->raid_disk = info->raid_disk; | |
5837 | else | |
5838 | rdev->raid_disk = -1; | |
5839 | ||
1da177e4 | 5840 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5841 | if (info->state & (1<<MD_DISK_SYNC)) |
5842 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5843 | |
8ddf9efe N |
5844 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5845 | set_bit(WriteMostly, &rdev->flags); | |
5846 | ||
1da177e4 LT |
5847 | if (!mddev->persistent) { |
5848 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5849 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5850 | } else | |
57b2caa3 | 5851 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5852 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5853 | |
2bf071bf N |
5854 | err = bind_rdev_to_array(rdev, mddev); |
5855 | if (err) { | |
5856 | export_rdev(rdev); | |
5857 | return err; | |
5858 | } | |
1da177e4 LT |
5859 | } |
5860 | ||
5861 | return 0; | |
5862 | } | |
5863 | ||
fd01b88c | 5864 | static int hot_remove_disk(struct mddev * mddev, dev_t dev) |
1da177e4 LT |
5865 | { |
5866 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 5867 | struct md_rdev *rdev; |
1da177e4 | 5868 | |
1da177e4 LT |
5869 | rdev = find_rdev(mddev, dev); |
5870 | if (!rdev) | |
5871 | return -ENXIO; | |
5872 | ||
3ea8929d N |
5873 | clear_bit(Blocked, &rdev->flags); |
5874 | remove_and_add_spares(mddev, rdev); | |
5875 | ||
1da177e4 LT |
5876 | if (rdev->raid_disk >= 0) |
5877 | goto busy; | |
5878 | ||
5879 | kick_rdev_from_array(rdev); | |
850b2b42 | 5880 | md_update_sb(mddev, 1); |
d7603b7e | 5881 | md_new_event(mddev); |
1da177e4 LT |
5882 | |
5883 | return 0; | |
5884 | busy: | |
fdefa4d8 | 5885 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5886 | bdevname(rdev->bdev,b), mdname(mddev)); |
5887 | return -EBUSY; | |
5888 | } | |
5889 | ||
fd01b88c | 5890 | static int hot_add_disk(struct mddev * mddev, dev_t dev) |
1da177e4 LT |
5891 | { |
5892 | char b[BDEVNAME_SIZE]; | |
5893 | int err; | |
3cb03002 | 5894 | struct md_rdev *rdev; |
1da177e4 LT |
5895 | |
5896 | if (!mddev->pers) | |
5897 | return -ENODEV; | |
5898 | ||
5899 | if (mddev->major_version != 0) { | |
5900 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5901 | " version-0 superblocks.\n", | |
5902 | mdname(mddev)); | |
5903 | return -EINVAL; | |
5904 | } | |
5905 | if (!mddev->pers->hot_add_disk) { | |
5906 | printk(KERN_WARNING | |
5907 | "%s: personality does not support diskops!\n", | |
5908 | mdname(mddev)); | |
5909 | return -EINVAL; | |
5910 | } | |
5911 | ||
d710e138 | 5912 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5913 | if (IS_ERR(rdev)) { |
5914 | printk(KERN_WARNING | |
5915 | "md: error, md_import_device() returned %ld\n", | |
5916 | PTR_ERR(rdev)); | |
5917 | return -EINVAL; | |
5918 | } | |
5919 | ||
5920 | if (mddev->persistent) | |
57b2caa3 | 5921 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5922 | else |
77304d2a | 5923 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5924 | |
8190e754 | 5925 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5926 | |
b2d444d7 | 5927 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5928 | printk(KERN_WARNING |
5929 | "md: can not hot-add faulty %s disk to %s!\n", | |
5930 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5931 | err = -EINVAL; | |
5932 | goto abort_export; | |
5933 | } | |
b2d444d7 | 5934 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5935 | rdev->desc_nr = -1; |
5842730d | 5936 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5937 | err = bind_rdev_to_array(rdev, mddev); |
5938 | if (err) | |
5939 | goto abort_export; | |
1da177e4 LT |
5940 | |
5941 | /* | |
5942 | * The rest should better be atomic, we can have disk failures | |
5943 | * noticed in interrupt contexts ... | |
5944 | */ | |
5945 | ||
1da177e4 LT |
5946 | rdev->raid_disk = -1; |
5947 | ||
850b2b42 | 5948 | md_update_sb(mddev, 1); |
1da177e4 LT |
5949 | |
5950 | /* | |
5951 | * Kick recovery, maybe this spare has to be added to the | |
5952 | * array immediately. | |
5953 | */ | |
5954 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5955 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5956 | md_new_event(mddev); |
1da177e4 LT |
5957 | return 0; |
5958 | ||
1da177e4 LT |
5959 | abort_export: |
5960 | export_rdev(rdev); | |
5961 | return err; | |
5962 | } | |
5963 | ||
fd01b88c | 5964 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c N |
5965 | { |
5966 | int err; | |
5967 | ||
36fa3063 N |
5968 | if (mddev->pers) { |
5969 | if (!mddev->pers->quiesce) | |
5970 | return -EBUSY; | |
5971 | if (mddev->recovery || mddev->sync_thread) | |
5972 | return -EBUSY; | |
5973 | /* we should be able to change the bitmap.. */ | |
5974 | } | |
32a7627c | 5975 | |
32a7627c | 5976 | |
36fa3063 N |
5977 | if (fd >= 0) { |
5978 | if (mddev->bitmap) | |
5979 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5980 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5981 | |
c3d9714e | 5982 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5983 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5984 | mdname(mddev)); | |
5985 | return -EBADF; | |
5986 | } | |
5987 | ||
c3d9714e | 5988 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5989 | if (err) { |
5990 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5991 | mdname(mddev)); | |
c3d9714e N |
5992 | fput(mddev->bitmap_info.file); |
5993 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5994 | return err; |
5995 | } | |
c3d9714e | 5996 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5997 | } else if (mddev->bitmap == NULL) |
5998 | return -ENOENT; /* cannot remove what isn't there */ | |
5999 | err = 0; | |
6000 | if (mddev->pers) { | |
6001 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 6002 | if (fd >= 0) { |
36fa3063 | 6003 | err = bitmap_create(mddev); |
69e51b44 N |
6004 | if (!err) |
6005 | err = bitmap_load(mddev); | |
6006 | } | |
d7375ab3 | 6007 | if (fd < 0 || err) { |
36fa3063 | 6008 | bitmap_destroy(mddev); |
d7375ab3 N |
6009 | fd = -1; /* make sure to put the file */ |
6010 | } | |
36fa3063 | 6011 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
6012 | } |
6013 | if (fd < 0) { | |
c3d9714e N |
6014 | if (mddev->bitmap_info.file) { |
6015 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
6016 | fput(mddev->bitmap_info.file); | |
acc55e22 | 6017 | } |
c3d9714e | 6018 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
6019 | } |
6020 | ||
32a7627c N |
6021 | return err; |
6022 | } | |
6023 | ||
1da177e4 LT |
6024 | /* |
6025 | * set_array_info is used two different ways | |
6026 | * The original usage is when creating a new array. | |
6027 | * In this usage, raid_disks is > 0 and it together with | |
6028 | * level, size, not_persistent,layout,chunksize determine the | |
6029 | * shape of the array. | |
6030 | * This will always create an array with a type-0.90.0 superblock. | |
6031 | * The newer usage is when assembling an array. | |
6032 | * In this case raid_disks will be 0, and the major_version field is | |
6033 | * use to determine which style super-blocks are to be found on the devices. | |
6034 | * The minor and patch _version numbers are also kept incase the | |
6035 | * super_block handler wishes to interpret them. | |
6036 | */ | |
fd01b88c | 6037 | static int set_array_info(struct mddev * mddev, mdu_array_info_t *info) |
1da177e4 LT |
6038 | { |
6039 | ||
6040 | if (info->raid_disks == 0) { | |
6041 | /* just setting version number for superblock loading */ | |
6042 | if (info->major_version < 0 || | |
50511da3 | 6043 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
6044 | super_types[info->major_version].name == NULL) { |
6045 | /* maybe try to auto-load a module? */ | |
6046 | printk(KERN_INFO | |
6047 | "md: superblock version %d not known\n", | |
6048 | info->major_version); | |
6049 | return -EINVAL; | |
6050 | } | |
6051 | mddev->major_version = info->major_version; | |
6052 | mddev->minor_version = info->minor_version; | |
6053 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 6054 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
6055 | /* ensure mddev_put doesn't delete this now that there |
6056 | * is some minimal configuration. | |
6057 | */ | |
6058 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
6059 | return 0; |
6060 | } | |
6061 | mddev->major_version = MD_MAJOR_VERSION; | |
6062 | mddev->minor_version = MD_MINOR_VERSION; | |
6063 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
6064 | mddev->ctime = get_seconds(); | |
6065 | ||
6066 | mddev->level = info->level; | |
17115e03 | 6067 | mddev->clevel[0] = 0; |
58c0fed4 | 6068 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
6069 | mddev->raid_disks = info->raid_disks; |
6070 | /* don't set md_minor, it is determined by which /dev/md* was | |
6071 | * openned | |
6072 | */ | |
6073 | if (info->state & (1<<MD_SB_CLEAN)) | |
6074 | mddev->recovery_cp = MaxSector; | |
6075 | else | |
6076 | mddev->recovery_cp = 0; | |
6077 | mddev->persistent = ! info->not_persistent; | |
e691063a | 6078 | mddev->external = 0; |
1da177e4 LT |
6079 | |
6080 | mddev->layout = info->layout; | |
9d8f0363 | 6081 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
6082 | |
6083 | mddev->max_disks = MD_SB_DISKS; | |
6084 | ||
e691063a N |
6085 | if (mddev->persistent) |
6086 | mddev->flags = 0; | |
850b2b42 | 6087 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6088 | |
c3d9714e | 6089 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6409bb05 | 6090 | mddev->bitmap_info.default_space = 64*2 - (MD_SB_BYTES >> 9); |
c3d9714e | 6091 | mddev->bitmap_info.offset = 0; |
b2a2703c | 6092 | |
f6705578 N |
6093 | mddev->reshape_position = MaxSector; |
6094 | ||
1da177e4 LT |
6095 | /* |
6096 | * Generate a 128 bit UUID | |
6097 | */ | |
6098 | get_random_bytes(mddev->uuid, 16); | |
6099 | ||
f6705578 | 6100 | mddev->new_level = mddev->level; |
664e7c41 | 6101 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
6102 | mddev->new_layout = mddev->layout; |
6103 | mddev->delta_disks = 0; | |
2c810cdd | 6104 | mddev->reshape_backwards = 0; |
f6705578 | 6105 | |
1da177e4 LT |
6106 | return 0; |
6107 | } | |
6108 | ||
fd01b88c | 6109 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 6110 | { |
b522adcd DW |
6111 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
6112 | ||
6113 | if (mddev->external_size) | |
6114 | return; | |
6115 | ||
1f403624 DW |
6116 | mddev->array_sectors = array_sectors; |
6117 | } | |
6118 | EXPORT_SYMBOL(md_set_array_sectors); | |
6119 | ||
fd01b88c | 6120 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6121 | { |
3cb03002 | 6122 | struct md_rdev *rdev; |
a35b0d69 | 6123 | int rv; |
d71f9f88 | 6124 | int fit = (num_sectors == 0); |
a35b0d69 N |
6125 | |
6126 | if (mddev->pers->resize == NULL) | |
6127 | return -EINVAL; | |
d71f9f88 AN |
6128 | /* The "num_sectors" is the number of sectors of each device that |
6129 | * is used. This can only make sense for arrays with redundancy. | |
6130 | * linear and raid0 always use whatever space is available. We can only | |
6131 | * consider changing this number if no resync or reconstruction is | |
6132 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6133 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6134 | * of each device. If num_sectors is zero, we find the largest size |
6135 | * that fits. | |
a35b0d69 N |
6136 | */ |
6137 | if (mddev->sync_thread) | |
6138 | return -EBUSY; | |
a4a6125a | 6139 | |
dafb20fa | 6140 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6141 | sector_t avail = rdev->sectors; |
01ab5662 | 6142 | |
d71f9f88 AN |
6143 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6144 | num_sectors = avail; | |
6145 | if (avail < num_sectors) | |
a35b0d69 N |
6146 | return -ENOSPC; |
6147 | } | |
d71f9f88 | 6148 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6149 | if (!rv) |
6150 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6151 | return rv; |
6152 | } | |
6153 | ||
fd01b88c | 6154 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6155 | { |
6156 | int rv; | |
c6563a8c | 6157 | struct md_rdev *rdev; |
da943b99 | 6158 | /* change the number of raid disks */ |
63c70c4f | 6159 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
6160 | return -EINVAL; |
6161 | if (raid_disks <= 0 || | |
233fca36 | 6162 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6163 | return -EINVAL; |
63c70c4f | 6164 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 6165 | return -EBUSY; |
c6563a8c N |
6166 | |
6167 | rdev_for_each(rdev, mddev) { | |
6168 | if (mddev->raid_disks < raid_disks && | |
6169 | rdev->data_offset < rdev->new_data_offset) | |
6170 | return -EINVAL; | |
6171 | if (mddev->raid_disks > raid_disks && | |
6172 | rdev->data_offset > rdev->new_data_offset) | |
6173 | return -EINVAL; | |
6174 | } | |
6175 | ||
63c70c4f | 6176 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6177 | if (mddev->delta_disks < 0) |
6178 | mddev->reshape_backwards = 1; | |
6179 | else if (mddev->delta_disks > 0) | |
6180 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6181 | |
6182 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6183 | if (rv < 0) { |
de171cb9 | 6184 | mddev->delta_disks = 0; |
2c810cdd N |
6185 | mddev->reshape_backwards = 0; |
6186 | } | |
da943b99 N |
6187 | return rv; |
6188 | } | |
6189 | ||
6190 | ||
1da177e4 LT |
6191 | /* |
6192 | * update_array_info is used to change the configuration of an | |
6193 | * on-line array. | |
6194 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6195 | * fields in the info are checked against the array. | |
6196 | * Any differences that cannot be handled will cause an error. | |
6197 | * Normally, only one change can be managed at a time. | |
6198 | */ | |
fd01b88c | 6199 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6200 | { |
6201 | int rv = 0; | |
6202 | int cnt = 0; | |
36fa3063 N |
6203 | int state = 0; |
6204 | ||
6205 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6206 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6207 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6208 | |
6209 | if (mddev->major_version != info->major_version || | |
6210 | mddev->minor_version != info->minor_version || | |
6211 | /* mddev->patch_version != info->patch_version || */ | |
6212 | mddev->ctime != info->ctime || | |
6213 | mddev->level != info->level || | |
6214 | /* mddev->layout != info->layout || */ | |
6215 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 6216 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6217 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6218 | ((state^info->state) & 0xfffffe00) | |
6219 | ) | |
1da177e4 LT |
6220 | return -EINVAL; |
6221 | /* Check there is only one change */ | |
58c0fed4 AN |
6222 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6223 | cnt++; | |
6224 | if (mddev->raid_disks != info->raid_disks) | |
6225 | cnt++; | |
6226 | if (mddev->layout != info->layout) | |
6227 | cnt++; | |
6228 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6229 | cnt++; | |
6230 | if (cnt == 0) | |
6231 | return 0; | |
6232 | if (cnt > 1) | |
6233 | return -EINVAL; | |
1da177e4 LT |
6234 | |
6235 | if (mddev->layout != info->layout) { | |
6236 | /* Change layout | |
6237 | * we don't need to do anything at the md level, the | |
6238 | * personality will take care of it all. | |
6239 | */ | |
50ac168a | 6240 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6241 | return -EINVAL; |
597a711b N |
6242 | else { |
6243 | mddev->new_layout = info->layout; | |
50ac168a | 6244 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6245 | if (rv) |
6246 | mddev->new_layout = mddev->layout; | |
6247 | return rv; | |
6248 | } | |
1da177e4 | 6249 | } |
58c0fed4 | 6250 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6251 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6252 | |
da943b99 N |
6253 | if (mddev->raid_disks != info->raid_disks) |
6254 | rv = update_raid_disks(mddev, info->raid_disks); | |
6255 | ||
36fa3063 N |
6256 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
6257 | if (mddev->pers->quiesce == NULL) | |
6258 | return -EINVAL; | |
6259 | if (mddev->recovery || mddev->sync_thread) | |
6260 | return -EBUSY; | |
6261 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
6262 | /* add the bitmap */ | |
6263 | if (mddev->bitmap) | |
6264 | return -EEXIST; | |
c3d9714e | 6265 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 6266 | return -EINVAL; |
c3d9714e N |
6267 | mddev->bitmap_info.offset = |
6268 | mddev->bitmap_info.default_offset; | |
6409bb05 N |
6269 | mddev->bitmap_info.space = |
6270 | mddev->bitmap_info.default_space; | |
36fa3063 N |
6271 | mddev->pers->quiesce(mddev, 1); |
6272 | rv = bitmap_create(mddev); | |
69e51b44 N |
6273 | if (!rv) |
6274 | rv = bitmap_load(mddev); | |
36fa3063 N |
6275 | if (rv) |
6276 | bitmap_destroy(mddev); | |
6277 | mddev->pers->quiesce(mddev, 0); | |
6278 | } else { | |
6279 | /* remove the bitmap */ | |
6280 | if (!mddev->bitmap) | |
6281 | return -ENOENT; | |
1ec885cd | 6282 | if (mddev->bitmap->storage.file) |
36fa3063 N |
6283 | return -EINVAL; |
6284 | mddev->pers->quiesce(mddev, 1); | |
6285 | bitmap_destroy(mddev); | |
6286 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6287 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6288 | } |
6289 | } | |
850b2b42 | 6290 | md_update_sb(mddev, 1); |
1da177e4 LT |
6291 | return rv; |
6292 | } | |
6293 | ||
fd01b88c | 6294 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6295 | { |
3cb03002 | 6296 | struct md_rdev *rdev; |
1ca69c4b | 6297 | int err = 0; |
1da177e4 LT |
6298 | |
6299 | if (mddev->pers == NULL) | |
6300 | return -ENODEV; | |
6301 | ||
1ca69c4b N |
6302 | rcu_read_lock(); |
6303 | rdev = find_rdev_rcu(mddev, dev); | |
1da177e4 | 6304 | if (!rdev) |
1ca69c4b N |
6305 | err = -ENODEV; |
6306 | else { | |
6307 | md_error(mddev, rdev); | |
6308 | if (!test_bit(Faulty, &rdev->flags)) | |
6309 | err = -EBUSY; | |
6310 | } | |
6311 | rcu_read_unlock(); | |
6312 | return err; | |
1da177e4 LT |
6313 | } |
6314 | ||
2f9618ce AN |
6315 | /* |
6316 | * We have a problem here : there is no easy way to give a CHS | |
6317 | * virtual geometry. We currently pretend that we have a 2 heads | |
6318 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6319 | * dosfs just mad... ;-) | |
6320 | */ | |
a885c8c4 CH |
6321 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6322 | { | |
fd01b88c | 6323 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6324 | |
6325 | geo->heads = 2; | |
6326 | geo->sectors = 4; | |
49ce6cea | 6327 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6328 | return 0; |
6329 | } | |
6330 | ||
a39907fa | 6331 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6332 | unsigned int cmd, unsigned long arg) |
6333 | { | |
6334 | int err = 0; | |
6335 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6336 | struct mddev *mddev = NULL; |
e2218350 | 6337 | int ro; |
1da177e4 | 6338 | |
506c9e44 N |
6339 | switch (cmd) { |
6340 | case RAID_VERSION: | |
6341 | case GET_ARRAY_INFO: | |
6342 | case GET_DISK_INFO: | |
6343 | break; | |
6344 | default: | |
6345 | if (!capable(CAP_SYS_ADMIN)) | |
6346 | return -EACCES; | |
6347 | } | |
1da177e4 LT |
6348 | |
6349 | /* | |
6350 | * Commands dealing with the RAID driver but not any | |
6351 | * particular array: | |
6352 | */ | |
c02c0aeb N |
6353 | switch (cmd) { |
6354 | case RAID_VERSION: | |
6355 | err = get_version(argp); | |
6356 | goto done; | |
1da177e4 | 6357 | |
c02c0aeb N |
6358 | case PRINT_RAID_DEBUG: |
6359 | err = 0; | |
6360 | md_print_devices(); | |
6361 | goto done; | |
1da177e4 LT |
6362 | |
6363 | #ifndef MODULE | |
c02c0aeb N |
6364 | case RAID_AUTORUN: |
6365 | err = 0; | |
6366 | autostart_arrays(arg); | |
6367 | goto done; | |
1da177e4 | 6368 | #endif |
c02c0aeb | 6369 | default:; |
1da177e4 LT |
6370 | } |
6371 | ||
6372 | /* | |
6373 | * Commands creating/starting a new array: | |
6374 | */ | |
6375 | ||
a39907fa | 6376 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6377 | |
6378 | if (!mddev) { | |
6379 | BUG(); | |
6380 | goto abort; | |
6381 | } | |
6382 | ||
1ca69c4b N |
6383 | /* Some actions do not requires the mutex */ |
6384 | switch (cmd) { | |
6385 | case GET_ARRAY_INFO: | |
6386 | if (!mddev->raid_disks && !mddev->external) | |
6387 | err = -ENODEV; | |
6388 | else | |
6389 | err = get_array_info(mddev, argp); | |
6390 | goto abort; | |
6391 | ||
6392 | case GET_DISK_INFO: | |
6393 | if (!mddev->raid_disks && !mddev->external) | |
6394 | err = -ENODEV; | |
6395 | else | |
6396 | err = get_disk_info(mddev, argp); | |
6397 | goto abort; | |
6398 | ||
6399 | case SET_DISK_FAULTY: | |
6400 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
6401 | goto abort; | |
6402 | } | |
6403 | ||
a7a3f08d N |
6404 | if (cmd == ADD_NEW_DISK) |
6405 | /* need to ensure md_delayed_delete() has completed */ | |
6406 | flush_workqueue(md_misc_wq); | |
6407 | ||
1da177e4 LT |
6408 | err = mddev_lock(mddev); |
6409 | if (err) { | |
6410 | printk(KERN_INFO | |
6411 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
6412 | err, cmd); | |
6413 | goto abort; | |
6414 | } | |
6415 | ||
c02c0aeb N |
6416 | if (cmd == SET_ARRAY_INFO) { |
6417 | mdu_array_info_t info; | |
6418 | if (!arg) | |
6419 | memset(&info, 0, sizeof(info)); | |
6420 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6421 | err = -EFAULT; | |
6422 | goto abort_unlock; | |
6423 | } | |
6424 | if (mddev->pers) { | |
6425 | err = update_array_info(mddev, &info); | |
6426 | if (err) { | |
6427 | printk(KERN_WARNING "md: couldn't update" | |
6428 | " array info. %d\n", err); | |
6429 | goto abort_unlock; | |
1da177e4 LT |
6430 | } |
6431 | goto done_unlock; | |
c02c0aeb N |
6432 | } |
6433 | if (!list_empty(&mddev->disks)) { | |
6434 | printk(KERN_WARNING | |
6435 | "md: array %s already has disks!\n", | |
6436 | mdname(mddev)); | |
6437 | err = -EBUSY; | |
6438 | goto abort_unlock; | |
6439 | } | |
6440 | if (mddev->raid_disks) { | |
6441 | printk(KERN_WARNING | |
6442 | "md: array %s already initialised!\n", | |
6443 | mdname(mddev)); | |
6444 | err = -EBUSY; | |
6445 | goto abort_unlock; | |
6446 | } | |
6447 | err = set_array_info(mddev, &info); | |
6448 | if (err) { | |
6449 | printk(KERN_WARNING "md: couldn't set" | |
6450 | " array info. %d\n", err); | |
6451 | goto abort_unlock; | |
6452 | } | |
6453 | goto done_unlock; | |
1da177e4 LT |
6454 | } |
6455 | ||
6456 | /* | |
6457 | * Commands querying/configuring an existing array: | |
6458 | */ | |
32a7627c | 6459 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6460 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6461 | if ((!mddev->raid_disks && !mddev->external) |
6462 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6463 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6464 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
6465 | err = -ENODEV; |
6466 | goto abort_unlock; | |
6467 | } | |
6468 | ||
6469 | /* | |
6470 | * Commands even a read-only array can execute: | |
6471 | */ | |
c02c0aeb N |
6472 | switch (cmd) { |
6473 | case GET_BITMAP_FILE: | |
6474 | err = get_bitmap_file(mddev, argp); | |
6475 | goto done_unlock; | |
32a7627c | 6476 | |
c02c0aeb N |
6477 | case RESTART_ARRAY_RW: |
6478 | err = restart_array(mddev); | |
6479 | goto done_unlock; | |
1da177e4 | 6480 | |
c02c0aeb N |
6481 | case STOP_ARRAY: |
6482 | err = do_md_stop(mddev, 0, bdev); | |
6483 | goto done_unlock; | |
1da177e4 | 6484 | |
c02c0aeb N |
6485 | case STOP_ARRAY_RO: |
6486 | err = md_set_readonly(mddev, bdev); | |
6487 | goto done_unlock; | |
1da177e4 | 6488 | |
3ea8929d N |
6489 | case HOT_REMOVE_DISK: |
6490 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
6491 | goto done_unlock; | |
6492 | ||
7ceb17e8 N |
6493 | case ADD_NEW_DISK: |
6494 | /* We can support ADD_NEW_DISK on read-only arrays | |
6495 | * on if we are re-adding a preexisting device. | |
6496 | * So require mddev->pers and MD_DISK_SYNC. | |
6497 | */ | |
6498 | if (mddev->pers) { | |
6499 | mdu_disk_info_t info; | |
6500 | if (copy_from_user(&info, argp, sizeof(info))) | |
6501 | err = -EFAULT; | |
6502 | else if (!(info.state & (1<<MD_DISK_SYNC))) | |
6503 | /* Need to clear read-only for this */ | |
6504 | break; | |
6505 | else | |
6506 | err = add_new_disk(mddev, &info); | |
6507 | goto done_unlock; | |
6508 | } | |
6509 | break; | |
6510 | ||
c02c0aeb N |
6511 | case BLKROSET: |
6512 | if (get_user(ro, (int __user *)(arg))) { | |
6513 | err = -EFAULT; | |
6514 | goto done_unlock; | |
6515 | } | |
6516 | err = -EINVAL; | |
e2218350 | 6517 | |
c02c0aeb N |
6518 | /* if the bdev is going readonly the value of mddev->ro |
6519 | * does not matter, no writes are coming | |
6520 | */ | |
6521 | if (ro) | |
6522 | goto done_unlock; | |
e2218350 | 6523 | |
c02c0aeb N |
6524 | /* are we are already prepared for writes? */ |
6525 | if (mddev->ro != 1) | |
6526 | goto done_unlock; | |
e2218350 | 6527 | |
c02c0aeb N |
6528 | /* transitioning to readauto need only happen for |
6529 | * arrays that call md_write_start | |
6530 | */ | |
6531 | if (mddev->pers) { | |
6532 | err = restart_array(mddev); | |
6533 | if (err == 0) { | |
6534 | mddev->ro = 2; | |
6535 | set_disk_ro(mddev->gendisk, 0); | |
e2218350 | 6536 | } |
c02c0aeb N |
6537 | } |
6538 | goto done_unlock; | |
1da177e4 LT |
6539 | } |
6540 | ||
6541 | /* | |
6542 | * The remaining ioctls are changing the state of the | |
f91de92e N |
6543 | * superblock, so we do not allow them on read-only arrays. |
6544 | * However non-MD ioctls (e.g. get-size) will still come through | |
6545 | * here and hit the 'default' below, so only disallow | |
6546 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 6547 | */ |
bb57fc64 | 6548 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
6549 | if (mddev->ro == 2) { |
6550 | mddev->ro = 0; | |
00bcb4ac | 6551 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 6552 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
f3378b48 N |
6553 | /* mddev_unlock will wake thread */ |
6554 | /* If a device failed while we were read-only, we | |
6555 | * need to make sure the metadata is updated now. | |
6556 | */ | |
6557 | if (test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
6558 | mddev_unlock(mddev); | |
6559 | wait_event(mddev->sb_wait, | |
6560 | !test_bit(MD_CHANGE_DEVS, &mddev->flags) && | |
6561 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
6562 | mddev_lock(mddev); | |
6563 | } | |
f91de92e N |
6564 | } else { |
6565 | err = -EROFS; | |
6566 | goto abort_unlock; | |
6567 | } | |
1da177e4 LT |
6568 | } |
6569 | ||
c02c0aeb N |
6570 | switch (cmd) { |
6571 | case ADD_NEW_DISK: | |
1da177e4 | 6572 | { |
c02c0aeb N |
6573 | mdu_disk_info_t info; |
6574 | if (copy_from_user(&info, argp, sizeof(info))) | |
6575 | err = -EFAULT; | |
6576 | else | |
6577 | err = add_new_disk(mddev, &info); | |
6578 | goto done_unlock; | |
6579 | } | |
1da177e4 | 6580 | |
c02c0aeb N |
6581 | case HOT_ADD_DISK: |
6582 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
6583 | goto done_unlock; | |
1da177e4 | 6584 | |
c02c0aeb N |
6585 | case RUN_ARRAY: |
6586 | err = do_md_run(mddev); | |
6587 | goto done_unlock; | |
1da177e4 | 6588 | |
c02c0aeb N |
6589 | case SET_BITMAP_FILE: |
6590 | err = set_bitmap_file(mddev, (int)arg); | |
6591 | goto done_unlock; | |
32a7627c | 6592 | |
c02c0aeb N |
6593 | default: |
6594 | err = -EINVAL; | |
6595 | goto abort_unlock; | |
1da177e4 LT |
6596 | } |
6597 | ||
6598 | done_unlock: | |
6599 | abort_unlock: | |
d3374825 N |
6600 | if (mddev->hold_active == UNTIL_IOCTL && |
6601 | err != -EINVAL) | |
6602 | mddev->hold_active = 0; | |
1da177e4 LT |
6603 | mddev_unlock(mddev); |
6604 | ||
6605 | return err; | |
6606 | done: | |
6607 | if (err) | |
6608 | MD_BUG(); | |
6609 | abort: | |
6610 | return err; | |
6611 | } | |
aa98aa31 AB |
6612 | #ifdef CONFIG_COMPAT |
6613 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6614 | unsigned int cmd, unsigned long arg) | |
6615 | { | |
6616 | switch (cmd) { | |
6617 | case HOT_REMOVE_DISK: | |
6618 | case HOT_ADD_DISK: | |
6619 | case SET_DISK_FAULTY: | |
6620 | case SET_BITMAP_FILE: | |
6621 | /* These take in integer arg, do not convert */ | |
6622 | break; | |
6623 | default: | |
6624 | arg = (unsigned long)compat_ptr(arg); | |
6625 | break; | |
6626 | } | |
6627 | ||
6628 | return md_ioctl(bdev, mode, cmd, arg); | |
6629 | } | |
6630 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6631 | |
a39907fa | 6632 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6633 | { |
6634 | /* | |
6635 | * Succeed if we can lock the mddev, which confirms that | |
6636 | * it isn't being stopped right now. | |
6637 | */ | |
fd01b88c | 6638 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6639 | int err; |
6640 | ||
0c098220 YL |
6641 | if (!mddev) |
6642 | return -ENODEV; | |
6643 | ||
d3374825 N |
6644 | if (mddev->gendisk != bdev->bd_disk) { |
6645 | /* we are racing with mddev_put which is discarding this | |
6646 | * bd_disk. | |
6647 | */ | |
6648 | mddev_put(mddev); | |
6649 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6650 | flush_workqueue(md_misc_wq); |
d3374825 N |
6651 | /* Then retry the open from the top */ |
6652 | return -ERESTARTSYS; | |
6653 | } | |
6654 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6655 | ||
c8c00a69 | 6656 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6657 | goto out; |
6658 | ||
6659 | err = 0; | |
f2ea68cf | 6660 | atomic_inc(&mddev->openers); |
c8c00a69 | 6661 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6662 | |
f0b4f7e2 | 6663 | check_disk_change(bdev); |
1da177e4 LT |
6664 | out: |
6665 | return err; | |
6666 | } | |
6667 | ||
db2a144b | 6668 | static void md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6669 | { |
fd01b88c | 6670 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6671 | |
52e5f9d1 | 6672 | BUG_ON(!mddev); |
f2ea68cf | 6673 | atomic_dec(&mddev->openers); |
1da177e4 | 6674 | mddev_put(mddev); |
1da177e4 | 6675 | } |
f0b4f7e2 N |
6676 | |
6677 | static int md_media_changed(struct gendisk *disk) | |
6678 | { | |
fd01b88c | 6679 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6680 | |
6681 | return mddev->changed; | |
6682 | } | |
6683 | ||
6684 | static int md_revalidate(struct gendisk *disk) | |
6685 | { | |
fd01b88c | 6686 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6687 | |
6688 | mddev->changed = 0; | |
6689 | return 0; | |
6690 | } | |
83d5cde4 | 6691 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6692 | { |
6693 | .owner = THIS_MODULE, | |
a39907fa AV |
6694 | .open = md_open, |
6695 | .release = md_release, | |
b492b852 | 6696 | .ioctl = md_ioctl, |
aa98aa31 AB |
6697 | #ifdef CONFIG_COMPAT |
6698 | .compat_ioctl = md_compat_ioctl, | |
6699 | #endif | |
a885c8c4 | 6700 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6701 | .media_changed = md_media_changed, |
6702 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6703 | }; |
6704 | ||
75c96f85 | 6705 | static int md_thread(void * arg) |
1da177e4 | 6706 | { |
2b8bf345 | 6707 | struct md_thread *thread = arg; |
1da177e4 | 6708 | |
1da177e4 LT |
6709 | /* |
6710 | * md_thread is a 'system-thread', it's priority should be very | |
6711 | * high. We avoid resource deadlocks individually in each | |
6712 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6713 | * the very same RT priority as kswapd, thus we will never get | |
6714 | * into a priority inversion deadlock. | |
6715 | * | |
6716 | * we definitely have to have equal or higher priority than | |
6717 | * bdflush, otherwise bdflush will deadlock if there are too | |
6718 | * many dirty RAID5 blocks. | |
6719 | */ | |
1da177e4 | 6720 | |
6985c43f | 6721 | allow_signal(SIGKILL); |
a6fb0934 | 6722 | while (!kthread_should_stop()) { |
1da177e4 | 6723 | |
93588e22 N |
6724 | /* We need to wait INTERRUPTIBLE so that |
6725 | * we don't add to the load-average. | |
6726 | * That means we need to be sure no signals are | |
6727 | * pending | |
6728 | */ | |
6729 | if (signal_pending(current)) | |
6730 | flush_signals(current); | |
6731 | ||
6732 | wait_event_interruptible_timeout | |
6733 | (thread->wqueue, | |
6734 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6735 | || kthread_should_stop(), | |
6736 | thread->timeout); | |
1da177e4 | 6737 | |
6c987910 N |
6738 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6739 | if (!kthread_should_stop()) | |
4ed8731d | 6740 | thread->run(thread); |
1da177e4 | 6741 | } |
a6fb0934 | 6742 | |
1da177e4 LT |
6743 | return 0; |
6744 | } | |
6745 | ||
2b8bf345 | 6746 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
6747 | { |
6748 | if (thread) { | |
36a4e1fe | 6749 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
6750 | set_bit(THREAD_WAKEUP, &thread->flags); |
6751 | wake_up(&thread->wqueue); | |
6752 | } | |
6753 | } | |
6754 | ||
4ed8731d SL |
6755 | struct md_thread *md_register_thread(void (*run) (struct md_thread *), |
6756 | struct mddev *mddev, const char *name) | |
1da177e4 | 6757 | { |
2b8bf345 | 6758 | struct md_thread *thread; |
1da177e4 | 6759 | |
2b8bf345 | 6760 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
6761 | if (!thread) |
6762 | return NULL; | |
6763 | ||
1da177e4 LT |
6764 | init_waitqueue_head(&thread->wqueue); |
6765 | ||
1da177e4 LT |
6766 | thread->run = run; |
6767 | thread->mddev = mddev; | |
32a7627c | 6768 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6769 | thread->tsk = kthread_run(md_thread, thread, |
6770 | "%s_%s", | |
6771 | mdname(thread->mddev), | |
0232605d | 6772 | name); |
a6fb0934 | 6773 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6774 | kfree(thread); |
6775 | return NULL; | |
6776 | } | |
1da177e4 LT |
6777 | return thread; |
6778 | } | |
6779 | ||
2b8bf345 | 6780 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 6781 | { |
2b8bf345 | 6782 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
6783 | if (!thread) |
6784 | return; | |
36a4e1fe | 6785 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
6786 | /* Locking ensures that mddev_unlock does not wake_up a |
6787 | * non-existent thread | |
6788 | */ | |
6789 | spin_lock(&pers_lock); | |
6790 | *threadp = NULL; | |
6791 | spin_unlock(&pers_lock); | |
a6fb0934 N |
6792 | |
6793 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6794 | kfree(thread); |
6795 | } | |
6796 | ||
fd01b88c | 6797 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
6798 | { |
6799 | if (!mddev) { | |
6800 | MD_BUG(); | |
6801 | return; | |
6802 | } | |
6803 | ||
b2d444d7 | 6804 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6805 | return; |
6bfe0b49 | 6806 | |
de393cde | 6807 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
6808 | return; |
6809 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6810 | if (mddev->degraded) |
6811 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6812 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6813 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6814 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6815 | md_wakeup_thread(mddev->thread); | |
768a418d | 6816 | if (mddev->event_work.func) |
e804ac78 | 6817 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6818 | md_new_event_inintr(mddev); |
1da177e4 LT |
6819 | } |
6820 | ||
6821 | /* seq_file implementation /proc/mdstat */ | |
6822 | ||
6823 | static void status_unused(struct seq_file *seq) | |
6824 | { | |
6825 | int i = 0; | |
3cb03002 | 6826 | struct md_rdev *rdev; |
1da177e4 LT |
6827 | |
6828 | seq_printf(seq, "unused devices: "); | |
6829 | ||
159ec1fc | 6830 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6831 | char b[BDEVNAME_SIZE]; |
6832 | i++; | |
6833 | seq_printf(seq, "%s ", | |
6834 | bdevname(rdev->bdev,b)); | |
6835 | } | |
6836 | if (!i) | |
6837 | seq_printf(seq, "<none>"); | |
6838 | ||
6839 | seq_printf(seq, "\n"); | |
6840 | } | |
6841 | ||
6842 | ||
fd01b88c | 6843 | static void status_resync(struct seq_file *seq, struct mddev * mddev) |
1da177e4 | 6844 | { |
dd71cf6b N |
6845 | sector_t max_sectors, resync, res; |
6846 | unsigned long dt, db; | |
6847 | sector_t rt; | |
4588b42e N |
6848 | int scale; |
6849 | unsigned int per_milli; | |
1da177e4 | 6850 | |
72f36d59 N |
6851 | if (mddev->curr_resync <= 3) |
6852 | resync = 0; | |
6853 | else | |
6854 | resync = mddev->curr_resync | |
6855 | - atomic_read(&mddev->recovery_active); | |
1da177e4 | 6856 | |
c804cdec N |
6857 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
6858 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 6859 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6860 | else |
dd71cf6b | 6861 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6862 | |
6863 | /* | |
6864 | * Should not happen. | |
6865 | */ | |
dd71cf6b | 6866 | if (!max_sectors) { |
1da177e4 LT |
6867 | MD_BUG(); |
6868 | return; | |
6869 | } | |
4588b42e | 6870 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6871 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6872 | * u32, as those are the requirements for sector_div. |
6873 | * Thus 'scale' must be at least 10 | |
6874 | */ | |
6875 | scale = 10; | |
6876 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6877 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6878 | scale++; |
6879 | } | |
6880 | res = (resync>>scale)*1000; | |
dd71cf6b | 6881 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6882 | |
6883 | per_milli = res; | |
1da177e4 | 6884 | { |
4588b42e | 6885 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6886 | seq_printf(seq, "["); |
6887 | for (i = 0; i < x; i++) | |
6888 | seq_printf(seq, "="); | |
6889 | seq_printf(seq, ">"); | |
6890 | for (i = 0; i < y; i++) | |
6891 | seq_printf(seq, "."); | |
6892 | seq_printf(seq, "] "); | |
6893 | } | |
4588b42e | 6894 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6895 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6896 | "reshape" : | |
61df9d91 N |
6897 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6898 | "check" : | |
6899 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6900 | "resync" : "recovery"))), | |
6901 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6902 | (unsigned long long) resync/2, |
6903 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6904 | |
6905 | /* | |
1da177e4 LT |
6906 | * dt: time from mark until now |
6907 | * db: blocks written from mark until now | |
6908 | * rt: remaining time | |
dd71cf6b N |
6909 | * |
6910 | * rt is a sector_t, so could be 32bit or 64bit. | |
6911 | * So we divide before multiply in case it is 32bit and close | |
6912 | * to the limit. | |
25985edc | 6913 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6914 | * near the end of resync when the number of remaining sectors |
6915 | * is close to 'db'. | |
6916 | * We then divide rt by 32 after multiplying by db to compensate. | |
6917 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6918 | */ |
6919 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6920 | if (!dt) dt++; | |
ff4e8d9a N |
6921 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6922 | - mddev->resync_mark_cnt; | |
1da177e4 | 6923 | |
dd71cf6b N |
6924 | rt = max_sectors - resync; /* number of remaining sectors */ |
6925 | sector_div(rt, db/32+1); | |
6926 | rt *= dt; | |
6927 | rt >>= 5; | |
6928 | ||
6929 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6930 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6931 | |
ff4e8d9a | 6932 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6933 | } |
6934 | ||
6935 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6936 | { | |
6937 | struct list_head *tmp; | |
6938 | loff_t l = *pos; | |
fd01b88c | 6939 | struct mddev *mddev; |
1da177e4 LT |
6940 | |
6941 | if (l >= 0x10000) | |
6942 | return NULL; | |
6943 | if (!l--) | |
6944 | /* header */ | |
6945 | return (void*)1; | |
6946 | ||
6947 | spin_lock(&all_mddevs_lock); | |
6948 | list_for_each(tmp,&all_mddevs) | |
6949 | if (!l--) { | |
fd01b88c | 6950 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
6951 | mddev_get(mddev); |
6952 | spin_unlock(&all_mddevs_lock); | |
6953 | return mddev; | |
6954 | } | |
6955 | spin_unlock(&all_mddevs_lock); | |
6956 | if (!l--) | |
6957 | return (void*)2;/* tail */ | |
6958 | return NULL; | |
6959 | } | |
6960 | ||
6961 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6962 | { | |
6963 | struct list_head *tmp; | |
fd01b88c | 6964 | struct mddev *next_mddev, *mddev = v; |
1da177e4 LT |
6965 | |
6966 | ++*pos; | |
6967 | if (v == (void*)2) | |
6968 | return NULL; | |
6969 | ||
6970 | spin_lock(&all_mddevs_lock); | |
6971 | if (v == (void*)1) | |
6972 | tmp = all_mddevs.next; | |
6973 | else | |
6974 | tmp = mddev->all_mddevs.next; | |
6975 | if (tmp != &all_mddevs) | |
fd01b88c | 6976 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
6977 | else { |
6978 | next_mddev = (void*)2; | |
6979 | *pos = 0x10000; | |
6980 | } | |
6981 | spin_unlock(&all_mddevs_lock); | |
6982 | ||
6983 | if (v != (void*)1) | |
6984 | mddev_put(mddev); | |
6985 | return next_mddev; | |
6986 | ||
6987 | } | |
6988 | ||
6989 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6990 | { | |
fd01b88c | 6991 | struct mddev *mddev = v; |
1da177e4 LT |
6992 | |
6993 | if (mddev && v != (void*)1 && v != (void*)2) | |
6994 | mddev_put(mddev); | |
6995 | } | |
6996 | ||
6997 | static int md_seq_show(struct seq_file *seq, void *v) | |
6998 | { | |
fd01b88c | 6999 | struct mddev *mddev = v; |
dd8ac336 | 7000 | sector_t sectors; |
3cb03002 | 7001 | struct md_rdev *rdev; |
1da177e4 LT |
7002 | |
7003 | if (v == (void*)1) { | |
84fc4b56 | 7004 | struct md_personality *pers; |
1da177e4 LT |
7005 | seq_printf(seq, "Personalities : "); |
7006 | spin_lock(&pers_lock); | |
2604b703 N |
7007 | list_for_each_entry(pers, &pers_list, list) |
7008 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
7009 | |
7010 | spin_unlock(&pers_lock); | |
7011 | seq_printf(seq, "\n"); | |
f1514638 | 7012 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
7013 | return 0; |
7014 | } | |
7015 | if (v == (void*)2) { | |
7016 | status_unused(seq); | |
7017 | return 0; | |
7018 | } | |
7019 | ||
5dc5cf7d | 7020 | if (mddev_lock(mddev) < 0) |
1da177e4 | 7021 | return -EINTR; |
5dc5cf7d | 7022 | |
1da177e4 LT |
7023 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
7024 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
7025 | mddev->pers ? "" : "in"); | |
7026 | if (mddev->pers) { | |
f91de92e | 7027 | if (mddev->ro==1) |
1da177e4 | 7028 | seq_printf(seq, " (read-only)"); |
f91de92e | 7029 | if (mddev->ro==2) |
52720ae7 | 7030 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
7031 | seq_printf(seq, " %s", mddev->pers->name); |
7032 | } | |
7033 | ||
dd8ac336 | 7034 | sectors = 0; |
dafb20fa | 7035 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
7036 | char b[BDEVNAME_SIZE]; |
7037 | seq_printf(seq, " %s[%d]", | |
7038 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
7039 | if (test_bit(WriteMostly, &rdev->flags)) |
7040 | seq_printf(seq, "(W)"); | |
b2d444d7 | 7041 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7042 | seq_printf(seq, "(F)"); |
7043 | continue; | |
2d78f8c4 N |
7044 | } |
7045 | if (rdev->raid_disk < 0) | |
b325a32e | 7046 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
7047 | if (test_bit(Replacement, &rdev->flags)) |
7048 | seq_printf(seq, "(R)"); | |
dd8ac336 | 7049 | sectors += rdev->sectors; |
1da177e4 LT |
7050 | } |
7051 | ||
7052 | if (!list_empty(&mddev->disks)) { | |
7053 | if (mddev->pers) | |
7054 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
7055 | (unsigned long long) |
7056 | mddev->array_sectors / 2); | |
1da177e4 LT |
7057 | else |
7058 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 7059 | (unsigned long long)sectors / 2); |
1da177e4 | 7060 | } |
1cd6bf19 N |
7061 | if (mddev->persistent) { |
7062 | if (mddev->major_version != 0 || | |
7063 | mddev->minor_version != 90) { | |
7064 | seq_printf(seq," super %d.%d", | |
7065 | mddev->major_version, | |
7066 | mddev->minor_version); | |
7067 | } | |
e691063a N |
7068 | } else if (mddev->external) |
7069 | seq_printf(seq, " super external:%s", | |
7070 | mddev->metadata_type); | |
7071 | else | |
1cd6bf19 | 7072 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
7073 | |
7074 | if (mddev->pers) { | |
d710e138 | 7075 | mddev->pers->status(seq, mddev); |
1da177e4 | 7076 | seq_printf(seq, "\n "); |
8e1b39d6 N |
7077 | if (mddev->pers->sync_request) { |
7078 | if (mddev->curr_resync > 2) { | |
d710e138 | 7079 | status_resync(seq, mddev); |
8e1b39d6 | 7080 | seq_printf(seq, "\n "); |
72f36d59 | 7081 | } else if (mddev->curr_resync >= 1) |
8e1b39d6 N |
7082 | seq_printf(seq, "\tresync=DELAYED\n "); |
7083 | else if (mddev->recovery_cp < MaxSector) | |
7084 | seq_printf(seq, "\tresync=PENDING\n "); | |
7085 | } | |
32a7627c N |
7086 | } else |
7087 | seq_printf(seq, "\n "); | |
7088 | ||
57148964 | 7089 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7090 | |
7091 | seq_printf(seq, "\n"); | |
7092 | } | |
7093 | mddev_unlock(mddev); | |
7094 | ||
7095 | return 0; | |
7096 | } | |
7097 | ||
110518bc | 7098 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7099 | .start = md_seq_start, |
7100 | .next = md_seq_next, | |
7101 | .stop = md_seq_stop, | |
7102 | .show = md_seq_show, | |
7103 | }; | |
7104 | ||
7105 | static int md_seq_open(struct inode *inode, struct file *file) | |
7106 | { | |
f1514638 | 7107 | struct seq_file *seq; |
1da177e4 LT |
7108 | int error; |
7109 | ||
7110 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7111 | if (error) |
f1514638 KS |
7112 | return error; |
7113 | ||
7114 | seq = file->private_data; | |
7115 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7116 | return error; |
7117 | } | |
7118 | ||
d7603b7e N |
7119 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7120 | { | |
f1514638 | 7121 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7122 | int mask; |
7123 | ||
7124 | poll_wait(filp, &md_event_waiters, wait); | |
7125 | ||
7126 | /* always allow read */ | |
7127 | mask = POLLIN | POLLRDNORM; | |
7128 | ||
f1514638 | 7129 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7130 | mask |= POLLERR | POLLPRI; |
7131 | return mask; | |
7132 | } | |
7133 | ||
fa027c2a | 7134 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7135 | .owner = THIS_MODULE, |
1da177e4 LT |
7136 | .open = md_seq_open, |
7137 | .read = seq_read, | |
7138 | .llseek = seq_lseek, | |
c3f94b40 | 7139 | .release = seq_release_private, |
d7603b7e | 7140 | .poll = mdstat_poll, |
1da177e4 LT |
7141 | }; |
7142 | ||
84fc4b56 | 7143 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7144 | { |
1da177e4 | 7145 | spin_lock(&pers_lock); |
2604b703 N |
7146 | list_add_tail(&p->list, &pers_list); |
7147 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
7148 | spin_unlock(&pers_lock); |
7149 | return 0; | |
7150 | } | |
7151 | ||
84fc4b56 | 7152 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7153 | { |
2604b703 | 7154 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7155 | spin_lock(&pers_lock); |
2604b703 | 7156 | list_del_init(&p->list); |
1da177e4 LT |
7157 | spin_unlock(&pers_lock); |
7158 | return 0; | |
7159 | } | |
7160 | ||
fd01b88c | 7161 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7162 | { |
3cb03002 | 7163 | struct md_rdev * rdev; |
1da177e4 | 7164 | int idle; |
eea1bf38 | 7165 | int curr_events; |
1da177e4 LT |
7166 | |
7167 | idle = 1; | |
4b80991c N |
7168 | rcu_read_lock(); |
7169 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7170 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7171 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7172 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7173 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7174 | /* sync IO will cause sync_io to increase before the disk_stats |
7175 | * as sync_io is counted when a request starts, and | |
7176 | * disk_stats is counted when it completes. | |
7177 | * So resync activity will cause curr_events to be smaller than | |
7178 | * when there was no such activity. | |
7179 | * non-sync IO will cause disk_stat to increase without | |
7180 | * increasing sync_io so curr_events will (eventually) | |
7181 | * be larger than it was before. Once it becomes | |
7182 | * substantially larger, the test below will cause | |
7183 | * the array to appear non-idle, and resync will slow | |
7184 | * down. | |
7185 | * If there is a lot of outstanding resync activity when | |
7186 | * we set last_event to curr_events, then all that activity | |
7187 | * completing might cause the array to appear non-idle | |
7188 | * and resync will be slowed down even though there might | |
7189 | * not have been non-resync activity. This will only | |
7190 | * happen once though. 'last_events' will soon reflect | |
7191 | * the state where there is little or no outstanding | |
7192 | * resync requests, and further resync activity will | |
7193 | * always make curr_events less than last_events. | |
c0e48521 | 7194 | * |
1da177e4 | 7195 | */ |
eea1bf38 | 7196 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7197 | rdev->last_events = curr_events; |
7198 | idle = 0; | |
7199 | } | |
7200 | } | |
4b80991c | 7201 | rcu_read_unlock(); |
1da177e4 LT |
7202 | return idle; |
7203 | } | |
7204 | ||
fd01b88c | 7205 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7206 | { |
7207 | /* another "blocks" (512byte) blocks have been synced */ | |
7208 | atomic_sub(blocks, &mddev->recovery_active); | |
7209 | wake_up(&mddev->recovery_wait); | |
7210 | if (!ok) { | |
dfc70645 | 7211 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
0a19caab | 7212 | set_bit(MD_RECOVERY_ERROR, &mddev->recovery); |
1da177e4 LT |
7213 | md_wakeup_thread(mddev->thread); |
7214 | // stop recovery, signal do_sync .... | |
7215 | } | |
7216 | } | |
7217 | ||
7218 | ||
06d91a5f N |
7219 | /* md_write_start(mddev, bi) |
7220 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7221 | * in superblock) before writing, schedule a superblock update |
7222 | * and wait for it to complete. | |
06d91a5f | 7223 | */ |
fd01b88c | 7224 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7225 | { |
0fd62b86 | 7226 | int did_change = 0; |
06d91a5f | 7227 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7228 | return; |
06d91a5f | 7229 | |
f91de92e N |
7230 | BUG_ON(mddev->ro == 1); |
7231 | if (mddev->ro == 2) { | |
7232 | /* need to switch to read/write */ | |
7233 | mddev->ro = 0; | |
7234 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7235 | md_wakeup_thread(mddev->thread); | |
25156198 | 7236 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7237 | did_change = 1; |
f91de92e | 7238 | } |
06d91a5f | 7239 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7240 | if (mddev->safemode == 1) |
7241 | mddev->safemode = 0; | |
06d91a5f | 7242 | if (mddev->in_sync) { |
a9701a30 | 7243 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
7244 | if (mddev->in_sync) { |
7245 | mddev->in_sync = 0; | |
850b2b42 | 7246 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7247 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7248 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7249 | did_change = 1; |
3d310eb7 | 7250 | } |
a9701a30 | 7251 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 7252 | } |
0fd62b86 | 7253 | if (did_change) |
00bcb4ac | 7254 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7255 | wait_event(mddev->sb_wait, |
09a44cc1 | 7256 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
7257 | } |
7258 | ||
fd01b88c | 7259 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7260 | { |
7261 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7262 | if (mddev->safemode == 2) | |
7263 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7264 | else if (mddev->safemode_delay) |
1da177e4 LT |
7265 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7266 | } | |
7267 | } | |
7268 | ||
2a2275d6 N |
7269 | /* md_allow_write(mddev) |
7270 | * Calling this ensures that the array is marked 'active' so that writes | |
7271 | * may proceed without blocking. It is important to call this before | |
7272 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7273 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7274 | * |
7275 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7276 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7277 | */ |
fd01b88c | 7278 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7279 | { |
7280 | if (!mddev->pers) | |
b5470dc5 | 7281 | return 0; |
2a2275d6 | 7282 | if (mddev->ro) |
b5470dc5 | 7283 | return 0; |
1a0fd497 | 7284 | if (!mddev->pers->sync_request) |
b5470dc5 | 7285 | return 0; |
2a2275d6 N |
7286 | |
7287 | spin_lock_irq(&mddev->write_lock); | |
7288 | if (mddev->in_sync) { | |
7289 | mddev->in_sync = 0; | |
7290 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7291 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7292 | if (mddev->safemode_delay && |
7293 | mddev->safemode == 0) | |
7294 | mddev->safemode = 1; | |
7295 | spin_unlock_irq(&mddev->write_lock); | |
7296 | md_update_sb(mddev, 0); | |
00bcb4ac | 7297 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
7298 | } else |
7299 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 7300 | |
070dc6dd | 7301 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7302 | return -EAGAIN; |
7303 | else | |
7304 | return 0; | |
2a2275d6 N |
7305 | } |
7306 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7307 | ||
1da177e4 LT |
7308 | #define SYNC_MARKS 10 |
7309 | #define SYNC_MARK_STEP (3*HZ) | |
54f89341 | 7310 | #define UPDATE_FREQUENCY (5*60*HZ) |
4ed8731d | 7311 | void md_do_sync(struct md_thread *thread) |
1da177e4 | 7312 | { |
4ed8731d | 7313 | struct mddev *mddev = thread->mddev; |
fd01b88c | 7314 | struct mddev *mddev2; |
1da177e4 LT |
7315 | unsigned int currspeed = 0, |
7316 | window; | |
57afd89f | 7317 | sector_t max_sectors,j, io_sectors; |
1da177e4 | 7318 | unsigned long mark[SYNC_MARKS]; |
54f89341 | 7319 | unsigned long update_time; |
1da177e4 LT |
7320 | sector_t mark_cnt[SYNC_MARKS]; |
7321 | int last_mark,m; | |
7322 | struct list_head *tmp; | |
7323 | sector_t last_check; | |
57afd89f | 7324 | int skipped = 0; |
3cb03002 | 7325 | struct md_rdev *rdev; |
61df9d91 | 7326 | char *desc; |
7c2c57c9 | 7327 | struct blk_plug plug; |
1da177e4 LT |
7328 | |
7329 | /* just incase thread restarts... */ | |
7330 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7331 | return; | |
5fd6c1dc N |
7332 | if (mddev->ro) /* never try to sync a read-only array */ |
7333 | return; | |
1da177e4 | 7334 | |
61df9d91 N |
7335 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
7336 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
7337 | desc = "data-check"; | |
7338 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7339 | desc = "requested-resync"; | |
7340 | else | |
7341 | desc = "resync"; | |
7342 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7343 | desc = "reshape"; | |
7344 | else | |
7345 | desc = "recovery"; | |
7346 | ||
1da177e4 LT |
7347 | /* we overload curr_resync somewhat here. |
7348 | * 0 == not engaged in resync at all | |
7349 | * 2 == checking that there is no conflict with another sync | |
7350 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7351 | * commense | |
7352 | * other == active in resync - this many blocks | |
7353 | * | |
7354 | * Before starting a resync we must have set curr_resync to | |
7355 | * 2, and then checked that every "conflicting" array has curr_resync | |
7356 | * less than ours. When we find one that is the same or higher | |
7357 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7358 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7359 | * This will mean we have to start checking from the beginning again. | |
7360 | * | |
7361 | */ | |
7362 | ||
7363 | do { | |
7364 | mddev->curr_resync = 2; | |
7365 | ||
7366 | try_again: | |
404e4b43 | 7367 | if (kthread_should_stop()) |
6985c43f | 7368 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
7369 | |
7370 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 7371 | goto skip; |
29ac4aa3 | 7372 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7373 | if (mddev2 == mddev) |
7374 | continue; | |
90b08710 BS |
7375 | if (!mddev->parallel_resync |
7376 | && mddev2->curr_resync | |
7377 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7378 | DEFINE_WAIT(wq); |
7379 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7380 | /* arbitrarily yield */ | |
7381 | mddev->curr_resync = 1; | |
7382 | wake_up(&resync_wait); | |
7383 | } | |
7384 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7385 | /* no need to wait here, we can wait the next | |
7386 | * time 'round when curr_resync == 2 | |
7387 | */ | |
7388 | continue; | |
9744197c N |
7389 | /* We need to wait 'interruptible' so as not to |
7390 | * contribute to the load average, and not to | |
7391 | * be caught by 'softlockup' | |
7392 | */ | |
7393 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 7394 | if (!kthread_should_stop() && |
8712e553 | 7395 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7396 | printk(KERN_INFO "md: delaying %s of %s" |
7397 | " until %s has finished (they" | |
1da177e4 | 7398 | " share one or more physical units)\n", |
61df9d91 | 7399 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7400 | mddev_put(mddev2); |
9744197c N |
7401 | if (signal_pending(current)) |
7402 | flush_signals(current); | |
1da177e4 LT |
7403 | schedule(); |
7404 | finish_wait(&resync_wait, &wq); | |
7405 | goto try_again; | |
7406 | } | |
7407 | finish_wait(&resync_wait, &wq); | |
7408 | } | |
7409 | } | |
7410 | } while (mddev->curr_resync < 2); | |
7411 | ||
5fd6c1dc | 7412 | j = 0; |
9d88883e | 7413 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7414 | /* resync follows the size requested by the personality, |
57afd89f | 7415 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7416 | */ |
7417 | max_sectors = mddev->resync_max_sectors; | |
7f7583d4 | 7418 | atomic64_set(&mddev->resync_mismatches, 0); |
5fd6c1dc | 7419 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7420 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7421 | j = mddev->resync_min; | |
7422 | else if (!mddev->bitmap) | |
5fd6c1dc | 7423 | j = mddev->recovery_cp; |
5e96ee65 | 7424 | |
ccfcc3c1 | 7425 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7426 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7427 | else { |
1da177e4 | 7428 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7429 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7430 | j = MaxSector; |
4e59ca7d | 7431 | rcu_read_lock(); |
dafb20fa | 7432 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc N |
7433 | if (rdev->raid_disk >= 0 && |
7434 | !test_bit(Faulty, &rdev->flags) && | |
7435 | !test_bit(In_sync, &rdev->flags) && | |
7436 | rdev->recovery_offset < j) | |
7437 | j = rdev->recovery_offset; | |
4e59ca7d | 7438 | rcu_read_unlock(); |
5fd6c1dc | 7439 | } |
1da177e4 | 7440 | |
61df9d91 N |
7441 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7442 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7443 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7444 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7445 | "(but not more than %d KB/sec) for %s.\n", |
7446 | speed_max(mddev), desc); | |
1da177e4 | 7447 | |
eea1bf38 | 7448 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7449 | |
57afd89f | 7450 | io_sectors = 0; |
1da177e4 LT |
7451 | for (m = 0; m < SYNC_MARKS; m++) { |
7452 | mark[m] = jiffies; | |
57afd89f | 7453 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7454 | } |
7455 | last_mark = 0; | |
7456 | mddev->resync_mark = mark[last_mark]; | |
7457 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7458 | ||
7459 | /* | |
7460 | * Tune reconstruction: | |
7461 | */ | |
7462 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7463 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7464 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7465 | |
7466 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7467 | last_check = 0; |
7468 | ||
7469 | if (j>2) { | |
7470 | printk(KERN_INFO | |
61df9d91 N |
7471 | "md: resuming %s of %s from checkpoint.\n", |
7472 | desc, mdname(mddev)); | |
1da177e4 | 7473 | mddev->curr_resync = j; |
72f36d59 N |
7474 | } else |
7475 | mddev->curr_resync = 3; /* no longer delayed */ | |
75d3da43 | 7476 | mddev->curr_resync_completed = j; |
72f36d59 N |
7477 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
7478 | md_new_event(mddev); | |
54f89341 | 7479 | update_time = jiffies; |
1da177e4 | 7480 | |
7c2c57c9 | 7481 | blk_start_plug(&plug); |
1da177e4 | 7482 | while (j < max_sectors) { |
57afd89f | 7483 | sector_t sectors; |
1da177e4 | 7484 | |
57afd89f | 7485 | skipped = 0; |
97e4f42d | 7486 | |
7a91ee1f N |
7487 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7488 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7489 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7490 | > (max_sectors >> 4)) || | |
54f89341 | 7491 | time_after_eq(jiffies, update_time + UPDATE_FREQUENCY) || |
7a91ee1f N |
7492 | (j - mddev->curr_resync_completed)*2 |
7493 | >= mddev->resync_max - mddev->curr_resync_completed | |
7494 | )) { | |
97e4f42d | 7495 | /* time to update curr_resync_completed */ |
97e4f42d N |
7496 | wait_event(mddev->recovery_wait, |
7497 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7498 | mddev->curr_resync_completed = j; |
35d78c66 | 7499 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && |
7500 | j > mddev->recovery_cp) | |
7501 | mddev->recovery_cp = j; | |
54f89341 | 7502 | update_time = jiffies; |
070dc6dd | 7503 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7504 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7505 | } |
acb180b0 | 7506 | |
e62e58a5 N |
7507 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
7508 | /* As this condition is controlled by user-space, | |
7509 | * we can block indefinitely, so use '_interruptible' | |
7510 | * to avoid triggering warnings. | |
7511 | */ | |
7512 | flush_signals(current); /* just in case */ | |
7513 | wait_event_interruptible(mddev->recovery_wait, | |
7514 | mddev->resync_max > j | |
7515 | || kthread_should_stop()); | |
7516 | } | |
acb180b0 N |
7517 | |
7518 | if (kthread_should_stop()) | |
7519 | goto interrupted; | |
7520 | ||
57afd89f | 7521 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7522 | currspeed < speed_min(mddev)); |
57afd89f | 7523 | if (sectors == 0) { |
dfc70645 | 7524 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
7525 | goto out; |
7526 | } | |
57afd89f N |
7527 | |
7528 | if (!skipped) { /* actual IO requested */ | |
7529 | io_sectors += sectors; | |
7530 | atomic_add(sectors, &mddev->recovery_active); | |
7531 | } | |
7532 | ||
e875ecea N |
7533 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7534 | break; | |
7535 | ||
1da177e4 | 7536 | j += sectors; |
72f36d59 N |
7537 | if (j > 2) |
7538 | mddev->curr_resync = j; | |
ff4e8d9a | 7539 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7540 | if (last_check == 0) |
e875ecea | 7541 | /* this is the earliest that rebuild will be |
d7603b7e N |
7542 | * visible in /proc/mdstat |
7543 | */ | |
7544 | md_new_event(mddev); | |
57afd89f N |
7545 | |
7546 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7547 | continue; |
7548 | ||
57afd89f | 7549 | last_check = io_sectors; |
1da177e4 LT |
7550 | repeat: |
7551 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7552 | /* step marks */ | |
7553 | int next = (last_mark+1) % SYNC_MARKS; | |
7554 | ||
7555 | mddev->resync_mark = mark[next]; | |
7556 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7557 | mark[next] = jiffies; | |
57afd89f | 7558 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7559 | last_mark = next; |
7560 | } | |
7561 | ||
7562 | ||
c6207277 N |
7563 | if (kthread_should_stop()) |
7564 | goto interrupted; | |
7565 | ||
1da177e4 LT |
7566 | |
7567 | /* | |
7568 | * this loop exits only if either when we are slower than | |
7569 | * the 'hard' speed limit, or the system was IO-idle for | |
7570 | * a jiffy. | |
7571 | * the system might be non-idle CPU-wise, but we only care | |
7572 | * about not overloading the IO subsystem. (things like an | |
7573 | * e2fsck being done on the RAID array should execute fast) | |
7574 | */ | |
1da177e4 LT |
7575 | cond_resched(); |
7576 | ||
57afd89f N |
7577 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
7578 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 7579 | |
88202a0c N |
7580 | if (currspeed > speed_min(mddev)) { |
7581 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7582 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7583 | msleep(500); |
1da177e4 LT |
7584 | goto repeat; |
7585 | } | |
7586 | } | |
7587 | } | |
61df9d91 | 7588 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
7589 | /* |
7590 | * this also signals 'finished resyncing' to md_stop | |
7591 | */ | |
7592 | out: | |
7c2c57c9 | 7593 | blk_finish_plug(&plug); |
1da177e4 LT |
7594 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7595 | ||
7596 | /* tell personality that we are finished */ | |
57afd89f | 7597 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7598 | |
dfc70645 | 7599 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7600 | mddev->curr_resync > 2) { |
7601 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7602 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7603 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7604 | printk(KERN_INFO | |
61df9d91 N |
7605 | "md: checkpointing %s of %s.\n", |
7606 | desc, mdname(mddev)); | |
0a19caab | 7607 | if (test_bit(MD_RECOVERY_ERROR, |
7608 | &mddev->recovery)) | |
7609 | mddev->recovery_cp = | |
7610 | mddev->curr_resync_completed; | |
7611 | else | |
7612 | mddev->recovery_cp = | |
7613 | mddev->curr_resync; | |
5fd6c1dc N |
7614 | } |
7615 | } else | |
7616 | mddev->recovery_cp = MaxSector; | |
7617 | } else { | |
7618 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7619 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 7620 | rcu_read_lock(); |
dafb20fa | 7621 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7622 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7623 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7624 | !test_bit(Faulty, &rdev->flags) && |
7625 | !test_bit(In_sync, &rdev->flags) && | |
7626 | rdev->recovery_offset < mddev->curr_resync) | |
7627 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7628 | rcu_read_unlock(); |
5fd6c1dc | 7629 | } |
1da177e4 | 7630 | } |
db91ff55 | 7631 | skip: |
17571284 | 7632 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7633 | |
c07b70ad N |
7634 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7635 | /* We completed so min/max setting can be forgotten if used. */ | |
7636 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7637 | mddev->resync_min = 0; | |
7638 | mddev->resync_max = MaxSector; | |
7639 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7640 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7641 | mddev->curr_resync = 0; |
7642 | wake_up(&resync_wait); | |
7643 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7644 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
7645 | return; |
7646 | ||
7647 | interrupted: | |
7648 | /* | |
7649 | * got a signal, exit. | |
7650 | */ | |
7651 | printk(KERN_INFO | |
7652 | "md: md_do_sync() got signal ... exiting\n"); | |
7653 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7654 | goto out; | |
7655 | ||
1da177e4 | 7656 | } |
29269553 | 7657 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7658 | |
746d3207 N |
7659 | static int remove_and_add_spares(struct mddev *mddev, |
7660 | struct md_rdev *this) | |
b4c4c7b8 | 7661 | { |
3cb03002 | 7662 | struct md_rdev *rdev; |
b4c4c7b8 | 7663 | int spares = 0; |
f2a371c5 | 7664 | int removed = 0; |
b4c4c7b8 | 7665 | |
dafb20fa | 7666 | rdev_for_each(rdev, mddev) |
746d3207 N |
7667 | if ((this == NULL || rdev == this) && |
7668 | rdev->raid_disk >= 0 && | |
6bfe0b49 | 7669 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7670 | (test_bit(Faulty, &rdev->flags) || |
7671 | ! test_bit(In_sync, &rdev->flags)) && | |
7672 | atomic_read(&rdev->nr_pending)==0) { | |
7673 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7674 | mddev, rdev) == 0) { |
36fad858 | 7675 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 7676 | rdev->raid_disk = -1; |
f2a371c5 | 7677 | removed++; |
b4c4c7b8 N |
7678 | } |
7679 | } | |
90584fc9 JB |
7680 | if (removed && mddev->kobj.sd) |
7681 | sysfs_notify(&mddev->kobj, NULL, "degraded"); | |
b4c4c7b8 | 7682 | |
746d3207 N |
7683 | if (this) |
7684 | goto no_add; | |
7685 | ||
dafb20fa | 7686 | rdev_for_each(rdev, mddev) { |
7bfec5f3 N |
7687 | if (rdev->raid_disk >= 0 && |
7688 | !test_bit(In_sync, &rdev->flags) && | |
7689 | !test_bit(Faulty, &rdev->flags)) | |
7690 | spares++; | |
7ceb17e8 N |
7691 | if (rdev->raid_disk >= 0) |
7692 | continue; | |
7693 | if (test_bit(Faulty, &rdev->flags)) | |
7694 | continue; | |
7695 | if (mddev->ro && | |
7696 | rdev->saved_raid_disk < 0) | |
7697 | continue; | |
7698 | ||
7699 | rdev->recovery_offset = 0; | |
7700 | if (rdev->saved_raid_disk >= 0 && mddev->in_sync) { | |
7701 | spin_lock_irq(&mddev->write_lock); | |
7702 | if (mddev->in_sync) | |
7703 | /* OK, this device, which is in_sync, | |
7704 | * will definitely be noticed before | |
7705 | * the next write, so recovery isn't | |
7706 | * needed. | |
7707 | */ | |
7708 | rdev->recovery_offset = mddev->recovery_cp; | |
7709 | spin_unlock_irq(&mddev->write_lock); | |
7710 | } | |
7711 | if (mddev->ro && rdev->recovery_offset != MaxSector) | |
7712 | /* not safe to add this disk now */ | |
7713 | continue; | |
7714 | if (mddev->pers-> | |
7715 | hot_add_disk(mddev, rdev) == 0) { | |
7716 | if (sysfs_link_rdev(mddev, rdev)) | |
7717 | /* failure here is OK */; | |
7718 | spares++; | |
7719 | md_new_event(mddev); | |
7720 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
dfc70645 | 7721 | } |
b4c4c7b8 | 7722 | } |
746d3207 | 7723 | no_add: |
6dafab6b N |
7724 | if (removed) |
7725 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 N |
7726 | return spares; |
7727 | } | |
7ebc0be7 | 7728 | |
1da177e4 LT |
7729 | /* |
7730 | * This routine is regularly called by all per-raid-array threads to | |
7731 | * deal with generic issues like resync and super-block update. | |
7732 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7733 | * need this as they never do any recovery or update the superblock. | |
7734 | * | |
7735 | * It does not do any resync itself, but rather "forks" off other threads | |
7736 | * to do that as needed. | |
7737 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7738 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7739 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7740 | * and wakeups up this thread which will reap the thread and finish up. |
7741 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7742 | * | |
7743 | * The overall approach is: | |
7744 | * 1/ if the superblock needs updating, update it. | |
7745 | * 2/ If a recovery thread is running, don't do anything else. | |
7746 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7747 | * 4/ If there are any faulty devices, remove them. | |
7748 | * 5/ If array is degraded, try to add spares devices | |
7749 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7750 | */ | |
fd01b88c | 7751 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 7752 | { |
68866e42 JB |
7753 | if (mddev->suspended) |
7754 | return; | |
7755 | ||
5f40402d | 7756 | if (mddev->bitmap) |
aa5cbd10 | 7757 | bitmap_daemon_work(mddev); |
1da177e4 | 7758 | |
fca4d848 | 7759 | if (signal_pending(current)) { |
31a59e34 | 7760 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7761 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7762 | mdname(mddev)); | |
7763 | mddev->safemode = 2; | |
7764 | } | |
7765 | flush_signals(current); | |
7766 | } | |
7767 | ||
c89a8eee N |
7768 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7769 | return; | |
1da177e4 | 7770 | if ( ! ( |
126925c0 | 7771 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7772 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7773 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7774 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7775 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7776 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7777 | )) |
7778 | return; | |
fca4d848 | 7779 | |
df5b89b3 | 7780 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7781 | int spares = 0; |
fca4d848 | 7782 | |
c89a8eee | 7783 | if (mddev->ro) { |
7ceb17e8 N |
7784 | /* On a read-only array we can: |
7785 | * - remove failed devices | |
7786 | * - add already-in_sync devices if the array itself | |
7787 | * is in-sync. | |
7788 | * As we only add devices that are already in-sync, | |
7789 | * we can activate the spares immediately. | |
c89a8eee | 7790 | */ |
c89a8eee | 7791 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7ceb17e8 N |
7792 | remove_and_add_spares(mddev, NULL); |
7793 | mddev->pers->spare_active(mddev); | |
c89a8eee N |
7794 | goto unlock; |
7795 | } | |
7796 | ||
31a59e34 | 7797 | if (!mddev->external) { |
0fd62b86 | 7798 | int did_change = 0; |
31a59e34 N |
7799 | spin_lock_irq(&mddev->write_lock); |
7800 | if (mddev->safemode && | |
7801 | !atomic_read(&mddev->writes_pending) && | |
7802 | !mddev->in_sync && | |
7803 | mddev->recovery_cp == MaxSector) { | |
7804 | mddev->in_sync = 1; | |
0fd62b86 | 7805 | did_change = 1; |
070dc6dd | 7806 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7807 | } |
7808 | if (mddev->safemode == 1) | |
7809 | mddev->safemode = 0; | |
7810 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7811 | if (did_change) |
00bcb4ac | 7812 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7813 | } |
fca4d848 | 7814 | |
850b2b42 N |
7815 | if (mddev->flags) |
7816 | md_update_sb(mddev, 0); | |
06d91a5f | 7817 | |
1da177e4 LT |
7818 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7819 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7820 | /* resync/recovery still happening */ | |
7821 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7822 | goto unlock; | |
7823 | } | |
7824 | if (mddev->sync_thread) { | |
a91d5ac0 | 7825 | md_reap_sync_thread(mddev); |
1da177e4 LT |
7826 | goto unlock; |
7827 | } | |
72a23c21 NB |
7828 | /* Set RUNNING before clearing NEEDED to avoid |
7829 | * any transients in the value of "sync_action". | |
7830 | */ | |
72f36d59 | 7831 | mddev->curr_resync_completed = 0; |
72a23c21 | 7832 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
24dd469d N |
7833 | /* Clear some bits that don't mean anything, but |
7834 | * might be left set | |
7835 | */ | |
24dd469d N |
7836 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7837 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7838 | |
ed209584 N |
7839 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
7840 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
5fd6c1dc | 7841 | goto unlock; |
1da177e4 LT |
7842 | /* no recovery is running. |
7843 | * remove any failed drives, then | |
7844 | * add spares if possible. | |
72f36d59 | 7845 | * Spares are also removed and re-added, to allow |
1da177e4 LT |
7846 | * the personality to fail the re-add. |
7847 | */ | |
1da177e4 | 7848 | |
b4c4c7b8 | 7849 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7850 | if (mddev->pers->check_reshape == NULL || |
7851 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7852 | /* Cannot proceed */ |
7853 | goto unlock; | |
7854 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7855 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
746d3207 | 7856 | } else if ((spares = remove_and_add_spares(mddev, NULL))) { |
24dd469d N |
7857 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7858 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7859 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7860 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7861 | } else if (mddev->recovery_cp < MaxSector) { |
7862 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7863 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7864 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7865 | /* nothing to be done ... */ | |
1da177e4 | 7866 | goto unlock; |
24dd469d | 7867 | |
1da177e4 | 7868 | if (mddev->pers->sync_request) { |
ef99bf48 | 7869 | if (spares) { |
a654b9d8 N |
7870 | /* We are adding a device or devices to an array |
7871 | * which has the bitmap stored on all devices. | |
7872 | * So make sure all bitmap pages get written | |
7873 | */ | |
7874 | bitmap_write_all(mddev->bitmap); | |
7875 | } | |
1da177e4 LT |
7876 | mddev->sync_thread = md_register_thread(md_do_sync, |
7877 | mddev, | |
0da3c619 | 7878 | "resync"); |
1da177e4 LT |
7879 | if (!mddev->sync_thread) { |
7880 | printk(KERN_ERR "%s: could not start resync" | |
7881 | " thread...\n", | |
7882 | mdname(mddev)); | |
7883 | /* leave the spares where they are, it shouldn't hurt */ | |
7ebc0be7 N |
7884 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7885 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7886 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7887 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7888 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
d7603b7e | 7889 | } else |
1da177e4 | 7890 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7891 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7892 | md_new_event(mddev); |
1da177e4 LT |
7893 | } |
7894 | unlock: | |
72a23c21 NB |
7895 | if (!mddev->sync_thread) { |
7896 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7897 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7898 | &mddev->recovery)) | |
0c3573f1 | 7899 | if (mddev->sysfs_action) |
00bcb4ac | 7900 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7901 | } |
1da177e4 LT |
7902 | mddev_unlock(mddev); |
7903 | } | |
7904 | } | |
7905 | ||
a91d5ac0 JB |
7906 | void md_reap_sync_thread(struct mddev *mddev) |
7907 | { | |
7908 | struct md_rdev *rdev; | |
7909 | ||
7910 | /* resync has finished, collect result */ | |
7911 | md_unregister_thread(&mddev->sync_thread); | |
7912 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7913 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7914 | /* success...*/ | |
7915 | /* activate any spares */ | |
7916 | if (mddev->pers->spare_active(mddev)) { | |
7917 | sysfs_notify(&mddev->kobj, NULL, | |
7918 | "degraded"); | |
7919 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
7920 | } | |
7921 | } | |
7922 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7923 | mddev->pers->finish_reshape) | |
7924 | mddev->pers->finish_reshape(mddev); | |
7925 | ||
7926 | /* If array is no-longer degraded, then any saved_raid_disk | |
7927 | * information must be scrapped. Also if any device is now | |
7928 | * In_sync we must scrape the saved_raid_disk for that device | |
7929 | * do the superblock for an incrementally recovered device | |
7930 | * written out. | |
7931 | */ | |
7932 | rdev_for_each(rdev, mddev) | |
7933 | if (!mddev->degraded || | |
7934 | test_bit(In_sync, &rdev->flags)) | |
7935 | rdev->saved_raid_disk = -1; | |
7936 | ||
7937 | md_update_sb(mddev, 1); | |
7938 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7939 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7940 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7941 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7942 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7943 | /* flag recovery needed just to double check */ | |
7944 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7945 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7946 | md_new_event(mddev); | |
7947 | if (mddev->event_work.func) | |
7948 | queue_work(md_misc_wq, &mddev->event_work); | |
7949 | } | |
7950 | ||
fd01b88c | 7951 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 7952 | { |
00bcb4ac | 7953 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 7954 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
7955 | !test_bit(Blocked, &rdev->flags) && |
7956 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
7957 | msecs_to_jiffies(5000)); |
7958 | rdev_dec_pending(rdev, mddev); | |
7959 | } | |
7960 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7961 | ||
c6563a8c N |
7962 | void md_finish_reshape(struct mddev *mddev) |
7963 | { | |
7964 | /* called be personality module when reshape completes. */ | |
7965 | struct md_rdev *rdev; | |
7966 | ||
7967 | rdev_for_each(rdev, mddev) { | |
7968 | if (rdev->data_offset > rdev->new_data_offset) | |
7969 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
7970 | else | |
7971 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
7972 | rdev->data_offset = rdev->new_data_offset; | |
7973 | } | |
7974 | } | |
7975 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
7976 | |
7977 | /* Bad block management. | |
7978 | * We can record which blocks on each device are 'bad' and so just | |
7979 | * fail those blocks, or that stripe, rather than the whole device. | |
7980 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7981 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7982 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7983 | * A 'shift' can be set so that larger blocks are tracked and | |
7984 | * consequently larger devices can be covered. | |
7985 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7986 | * | |
7987 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7988 | * might need to retry if it is very unlucky. | |
7989 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7990 | * so we use the write_seqlock_irq variant. | |
7991 | * | |
7992 | * When looking for a bad block we specify a range and want to | |
7993 | * know if any block in the range is bad. So we binary-search | |
7994 | * to the last range that starts at-or-before the given endpoint, | |
7995 | * (or "before the sector after the target range") | |
7996 | * then see if it ends after the given start. | |
7997 | * We return | |
7998 | * 0 if there are no known bad blocks in the range | |
7999 | * 1 if there are known bad block which are all acknowledged | |
8000 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
8001 | * plus the start/length of the first bad section we overlap. | |
8002 | */ | |
8003 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
8004 | sector_t *first_bad, int *bad_sectors) | |
8005 | { | |
8006 | int hi; | |
ab05613a | 8007 | int lo; |
2230dfe4 | 8008 | u64 *p = bb->page; |
ab05613a | 8009 | int rv; |
2230dfe4 N |
8010 | sector_t target = s + sectors; |
8011 | unsigned seq; | |
8012 | ||
8013 | if (bb->shift > 0) { | |
8014 | /* round the start down, and the end up */ | |
8015 | s >>= bb->shift; | |
8016 | target += (1<<bb->shift) - 1; | |
8017 | target >>= bb->shift; | |
8018 | sectors = target - s; | |
8019 | } | |
8020 | /* 'target' is now the first block after the bad range */ | |
8021 | ||
8022 | retry: | |
8023 | seq = read_seqbegin(&bb->lock); | |
ab05613a | 8024 | lo = 0; |
8025 | rv = 0; | |
2230dfe4 N |
8026 | hi = bb->count; |
8027 | ||
8028 | /* Binary search between lo and hi for 'target' | |
8029 | * i.e. for the last range that starts before 'target' | |
8030 | */ | |
8031 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
8032 | * are known not to be the last range before target. | |
8033 | * VARIANT: hi-lo is the number of possible | |
8034 | * ranges, and decreases until it reaches 1 | |
8035 | */ | |
8036 | while (hi - lo > 1) { | |
8037 | int mid = (lo + hi) / 2; | |
8038 | sector_t a = BB_OFFSET(p[mid]); | |
8039 | if (a < target) | |
8040 | /* This could still be the one, earlier ranges | |
8041 | * could not. */ | |
8042 | lo = mid; | |
8043 | else | |
8044 | /* This and later ranges are definitely out. */ | |
8045 | hi = mid; | |
8046 | } | |
8047 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
8048 | if (hi > lo) { | |
8049 | /* need to check all range that end after 's' to see if | |
8050 | * any are unacknowledged. | |
8051 | */ | |
8052 | while (lo >= 0 && | |
8053 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8054 | if (BB_OFFSET(p[lo]) < target) { | |
8055 | /* starts before the end, and finishes after | |
8056 | * the start, so they must overlap | |
8057 | */ | |
8058 | if (rv != -1 && BB_ACK(p[lo])) | |
8059 | rv = 1; | |
8060 | else | |
8061 | rv = -1; | |
8062 | *first_bad = BB_OFFSET(p[lo]); | |
8063 | *bad_sectors = BB_LEN(p[lo]); | |
8064 | } | |
8065 | lo--; | |
8066 | } | |
8067 | } | |
8068 | ||
8069 | if (read_seqretry(&bb->lock, seq)) | |
8070 | goto retry; | |
8071 | ||
8072 | return rv; | |
8073 | } | |
8074 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
8075 | ||
8076 | /* | |
8077 | * Add a range of bad blocks to the table. | |
8078 | * This might extend the table, or might contract it | |
8079 | * if two adjacent ranges can be merged. | |
8080 | * We binary-search to find the 'insertion' point, then | |
8081 | * decide how best to handle it. | |
8082 | */ | |
8083 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
8084 | int acknowledged) | |
8085 | { | |
8086 | u64 *p; | |
8087 | int lo, hi; | |
8088 | int rv = 1; | |
8089 | ||
8090 | if (bb->shift < 0) | |
8091 | /* badblocks are disabled */ | |
8092 | return 0; | |
8093 | ||
8094 | if (bb->shift) { | |
8095 | /* round the start down, and the end up */ | |
8096 | sector_t next = s + sectors; | |
8097 | s >>= bb->shift; | |
8098 | next += (1<<bb->shift) - 1; | |
8099 | next >>= bb->shift; | |
8100 | sectors = next - s; | |
8101 | } | |
8102 | ||
8103 | write_seqlock_irq(&bb->lock); | |
8104 | ||
8105 | p = bb->page; | |
8106 | lo = 0; | |
8107 | hi = bb->count; | |
8108 | /* Find the last range that starts at-or-before 's' */ | |
8109 | while (hi - lo > 1) { | |
8110 | int mid = (lo + hi) / 2; | |
8111 | sector_t a = BB_OFFSET(p[mid]); | |
8112 | if (a <= s) | |
8113 | lo = mid; | |
8114 | else | |
8115 | hi = mid; | |
8116 | } | |
8117 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8118 | hi = lo; | |
8119 | ||
8120 | if (hi > lo) { | |
8121 | /* we found a range that might merge with the start | |
8122 | * of our new range | |
8123 | */ | |
8124 | sector_t a = BB_OFFSET(p[lo]); | |
8125 | sector_t e = a + BB_LEN(p[lo]); | |
8126 | int ack = BB_ACK(p[lo]); | |
8127 | if (e >= s) { | |
8128 | /* Yes, we can merge with a previous range */ | |
8129 | if (s == a && s + sectors >= e) | |
8130 | /* new range covers old */ | |
8131 | ack = acknowledged; | |
8132 | else | |
8133 | ack = ack && acknowledged; | |
8134 | ||
8135 | if (e < s + sectors) | |
8136 | e = s + sectors; | |
8137 | if (e - a <= BB_MAX_LEN) { | |
8138 | p[lo] = BB_MAKE(a, e-a, ack); | |
8139 | s = e; | |
8140 | } else { | |
8141 | /* does not all fit in one range, | |
8142 | * make p[lo] maximal | |
8143 | */ | |
8144 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8145 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8146 | s = a + BB_MAX_LEN; | |
8147 | } | |
8148 | sectors = e - s; | |
8149 | } | |
8150 | } | |
8151 | if (sectors && hi < bb->count) { | |
8152 | /* 'hi' points to the first range that starts after 's'. | |
8153 | * Maybe we can merge with the start of that range */ | |
8154 | sector_t a = BB_OFFSET(p[hi]); | |
8155 | sector_t e = a + BB_LEN(p[hi]); | |
8156 | int ack = BB_ACK(p[hi]); | |
8157 | if (a <= s + sectors) { | |
8158 | /* merging is possible */ | |
8159 | if (e <= s + sectors) { | |
8160 | /* full overlap */ | |
8161 | e = s + sectors; | |
8162 | ack = acknowledged; | |
8163 | } else | |
8164 | ack = ack && acknowledged; | |
8165 | ||
8166 | a = s; | |
8167 | if (e - a <= BB_MAX_LEN) { | |
8168 | p[hi] = BB_MAKE(a, e-a, ack); | |
8169 | s = e; | |
8170 | } else { | |
8171 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8172 | s = a + BB_MAX_LEN; | |
8173 | } | |
8174 | sectors = e - s; | |
8175 | lo = hi; | |
8176 | hi++; | |
8177 | } | |
8178 | } | |
8179 | if (sectors == 0 && hi < bb->count) { | |
8180 | /* we might be able to combine lo and hi */ | |
8181 | /* Note: 's' is at the end of 'lo' */ | |
8182 | sector_t a = BB_OFFSET(p[hi]); | |
8183 | int lolen = BB_LEN(p[lo]); | |
8184 | int hilen = BB_LEN(p[hi]); | |
8185 | int newlen = lolen + hilen - (s - a); | |
8186 | if (s >= a && newlen < BB_MAX_LEN) { | |
8187 | /* yes, we can combine them */ | |
8188 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8189 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8190 | memmove(p + hi, p + hi + 1, | |
8191 | (bb->count - hi - 1) * 8); | |
8192 | bb->count--; | |
8193 | } | |
8194 | } | |
8195 | while (sectors) { | |
8196 | /* didn't merge (it all). | |
8197 | * Need to add a range just before 'hi' */ | |
8198 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8199 | /* No room for more */ | |
8200 | rv = 0; | |
8201 | break; | |
8202 | } else { | |
8203 | int this_sectors = sectors; | |
8204 | memmove(p + hi + 1, p + hi, | |
8205 | (bb->count - hi) * 8); | |
8206 | bb->count++; | |
8207 | ||
8208 | if (this_sectors > BB_MAX_LEN) | |
8209 | this_sectors = BB_MAX_LEN; | |
8210 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8211 | sectors -= this_sectors; | |
8212 | s += this_sectors; | |
8213 | } | |
8214 | } | |
8215 | ||
8216 | bb->changed = 1; | |
de393cde N |
8217 | if (!acknowledged) |
8218 | bb->unacked_exist = 1; | |
2230dfe4 N |
8219 | write_sequnlock_irq(&bb->lock); |
8220 | ||
8221 | return rv; | |
8222 | } | |
8223 | ||
3cb03002 | 8224 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8225 | int is_new) |
2230dfe4 | 8226 | { |
c6563a8c N |
8227 | int rv; |
8228 | if (is_new) | |
8229 | s += rdev->new_data_offset; | |
8230 | else | |
8231 | s += rdev->data_offset; | |
8232 | rv = md_set_badblocks(&rdev->badblocks, | |
8233 | s, sectors, 0); | |
2230dfe4 N |
8234 | if (rv) { |
8235 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8236 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 N |
8237 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
8238 | md_wakeup_thread(rdev->mddev->thread); | |
8239 | } | |
8240 | return rv; | |
8241 | } | |
8242 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8243 | ||
8244 | /* | |
8245 | * Remove a range of bad blocks from the table. | |
8246 | * This may involve extending the table if we spilt a region, | |
8247 | * but it must not fail. So if the table becomes full, we just | |
8248 | * drop the remove request. | |
8249 | */ | |
8250 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8251 | { | |
8252 | u64 *p; | |
8253 | int lo, hi; | |
8254 | sector_t target = s + sectors; | |
8255 | int rv = 0; | |
8256 | ||
8257 | if (bb->shift > 0) { | |
8258 | /* When clearing we round the start up and the end down. | |
8259 | * This should not matter as the shift should align with | |
8260 | * the block size and no rounding should ever be needed. | |
8261 | * However it is better the think a block is bad when it | |
8262 | * isn't than to think a block is not bad when it is. | |
8263 | */ | |
8264 | s += (1<<bb->shift) - 1; | |
8265 | s >>= bb->shift; | |
8266 | target >>= bb->shift; | |
8267 | sectors = target - s; | |
8268 | } | |
8269 | ||
8270 | write_seqlock_irq(&bb->lock); | |
8271 | ||
8272 | p = bb->page; | |
8273 | lo = 0; | |
8274 | hi = bb->count; | |
8275 | /* Find the last range that starts before 'target' */ | |
8276 | while (hi - lo > 1) { | |
8277 | int mid = (lo + hi) / 2; | |
8278 | sector_t a = BB_OFFSET(p[mid]); | |
8279 | if (a < target) | |
8280 | lo = mid; | |
8281 | else | |
8282 | hi = mid; | |
8283 | } | |
8284 | if (hi > lo) { | |
8285 | /* p[lo] is the last range that could overlap the | |
8286 | * current range. Earlier ranges could also overlap, | |
8287 | * but only this one can overlap the end of the range. | |
8288 | */ | |
8289 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8290 | /* Partial overlap, leave the tail of this range */ | |
8291 | int ack = BB_ACK(p[lo]); | |
8292 | sector_t a = BB_OFFSET(p[lo]); | |
8293 | sector_t end = a + BB_LEN(p[lo]); | |
8294 | ||
8295 | if (a < s) { | |
8296 | /* we need to split this range */ | |
8297 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8298 | rv = 0; | |
8299 | goto out; | |
8300 | } | |
8301 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8302 | bb->count++; | |
8303 | p[lo] = BB_MAKE(a, s-a, ack); | |
8304 | lo++; | |
8305 | } | |
8306 | p[lo] = BB_MAKE(target, end - target, ack); | |
8307 | /* there is no longer an overlap */ | |
8308 | hi = lo; | |
8309 | lo--; | |
8310 | } | |
8311 | while (lo >= 0 && | |
8312 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8313 | /* This range does overlap */ | |
8314 | if (BB_OFFSET(p[lo]) < s) { | |
8315 | /* Keep the early parts of this range. */ | |
8316 | int ack = BB_ACK(p[lo]); | |
8317 | sector_t start = BB_OFFSET(p[lo]); | |
8318 | p[lo] = BB_MAKE(start, s - start, ack); | |
8319 | /* now low doesn't overlap, so.. */ | |
8320 | break; | |
8321 | } | |
8322 | lo--; | |
8323 | } | |
8324 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8325 | * anything between needs to be discarded | |
8326 | */ | |
8327 | if (hi - lo > 1) { | |
8328 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8329 | bb->count -= (hi - lo - 1); | |
8330 | } | |
8331 | } | |
8332 | ||
8333 | bb->changed = 1; | |
8334 | out: | |
8335 | write_sequnlock_irq(&bb->lock); | |
8336 | return rv; | |
8337 | } | |
8338 | ||
c6563a8c N |
8339 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8340 | int is_new) | |
2230dfe4 | 8341 | { |
c6563a8c N |
8342 | if (is_new) |
8343 | s += rdev->new_data_offset; | |
8344 | else | |
8345 | s += rdev->data_offset; | |
2230dfe4 | 8346 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8347 | s, sectors); |
2230dfe4 N |
8348 | } |
8349 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8350 | ||
8351 | /* | |
8352 | * Acknowledge all bad blocks in a list. | |
8353 | * This only succeeds if ->changed is clear. It is used by | |
8354 | * in-kernel metadata updates | |
8355 | */ | |
8356 | void md_ack_all_badblocks(struct badblocks *bb) | |
8357 | { | |
8358 | if (bb->page == NULL || bb->changed) | |
8359 | /* no point even trying */ | |
8360 | return; | |
8361 | write_seqlock_irq(&bb->lock); | |
8362 | ||
ecb178bb | 8363 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8364 | u64 *p = bb->page; |
8365 | int i; | |
8366 | for (i = 0; i < bb->count ; i++) { | |
8367 | if (!BB_ACK(p[i])) { | |
8368 | sector_t start = BB_OFFSET(p[i]); | |
8369 | int len = BB_LEN(p[i]); | |
8370 | p[i] = BB_MAKE(start, len, 1); | |
8371 | } | |
8372 | } | |
de393cde | 8373 | bb->unacked_exist = 0; |
2230dfe4 N |
8374 | } |
8375 | write_sequnlock_irq(&bb->lock); | |
8376 | } | |
8377 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8378 | ||
16c791a5 N |
8379 | /* sysfs access to bad-blocks list. |
8380 | * We present two files. | |
8381 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8382 | * are recorded as bad. The list is truncated to fit within | |
8383 | * the one-page limit of sysfs. | |
8384 | * Writing "sector length" to this file adds an acknowledged | |
8385 | * bad block list. | |
8386 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8387 | * been acknowledged. Writing to this file adds bad blocks | |
8388 | * without acknowledging them. This is largely for testing. | |
8389 | */ | |
8390 | ||
8391 | static ssize_t | |
8392 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8393 | { | |
8394 | size_t len; | |
8395 | int i; | |
8396 | u64 *p = bb->page; | |
8397 | unsigned seq; | |
8398 | ||
8399 | if (bb->shift < 0) | |
8400 | return 0; | |
8401 | ||
8402 | retry: | |
8403 | seq = read_seqbegin(&bb->lock); | |
8404 | ||
8405 | len = 0; | |
8406 | i = 0; | |
8407 | ||
8408 | while (len < PAGE_SIZE && i < bb->count) { | |
8409 | sector_t s = BB_OFFSET(p[i]); | |
8410 | unsigned int length = BB_LEN(p[i]); | |
8411 | int ack = BB_ACK(p[i]); | |
8412 | i++; | |
8413 | ||
8414 | if (unack && ack) | |
8415 | continue; | |
8416 | ||
8417 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8418 | (unsigned long long)s << bb->shift, | |
8419 | length << bb->shift); | |
8420 | } | |
de393cde N |
8421 | if (unack && len == 0) |
8422 | bb->unacked_exist = 0; | |
16c791a5 N |
8423 | |
8424 | if (read_seqretry(&bb->lock, seq)) | |
8425 | goto retry; | |
8426 | ||
8427 | return len; | |
8428 | } | |
8429 | ||
8430 | #define DO_DEBUG 1 | |
8431 | ||
8432 | static ssize_t | |
8433 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8434 | { | |
8435 | unsigned long long sector; | |
8436 | int length; | |
8437 | char newline; | |
8438 | #ifdef DO_DEBUG | |
8439 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8440 | * Normally only a successful write may clear a badblock | |
8441 | */ | |
8442 | int clear = 0; | |
8443 | if (page[0] == '-') { | |
8444 | clear = 1; | |
8445 | page++; | |
8446 | } | |
8447 | #endif /* DO_DEBUG */ | |
8448 | ||
8449 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8450 | case 3: | |
8451 | if (newline != '\n') | |
8452 | return -EINVAL; | |
8453 | case 2: | |
8454 | if (length <= 0) | |
8455 | return -EINVAL; | |
8456 | break; | |
8457 | default: | |
8458 | return -EINVAL; | |
8459 | } | |
8460 | ||
8461 | #ifdef DO_DEBUG | |
8462 | if (clear) { | |
8463 | md_clear_badblocks(bb, sector, length); | |
8464 | return len; | |
8465 | } | |
8466 | #endif /* DO_DEBUG */ | |
8467 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8468 | return len; | |
8469 | else | |
8470 | return -ENOSPC; | |
8471 | } | |
8472 | ||
75c96f85 AB |
8473 | static int md_notify_reboot(struct notifier_block *this, |
8474 | unsigned long code, void *x) | |
1da177e4 LT |
8475 | { |
8476 | struct list_head *tmp; | |
fd01b88c | 8477 | struct mddev *mddev; |
2dba6a91 | 8478 | int need_delay = 0; |
1da177e4 | 8479 | |
c744a65c N |
8480 | for_each_mddev(mddev, tmp) { |
8481 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8482 | if (mddev->pers) |
8483 | __md_stop_writes(mddev); | |
c744a65c N |
8484 | mddev->safemode = 2; |
8485 | mddev_unlock(mddev); | |
2dba6a91 | 8486 | } |
c744a65c | 8487 | need_delay = 1; |
1da177e4 | 8488 | } |
c744a65c N |
8489 | /* |
8490 | * certain more exotic SCSI devices are known to be | |
8491 | * volatile wrt too early system reboots. While the | |
8492 | * right place to handle this issue is the given | |
8493 | * driver, we do want to have a safe RAID driver ... | |
8494 | */ | |
8495 | if (need_delay) | |
8496 | mdelay(1000*1); | |
8497 | ||
1da177e4 LT |
8498 | return NOTIFY_DONE; |
8499 | } | |
8500 | ||
75c96f85 | 8501 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8502 | .notifier_call = md_notify_reboot, |
8503 | .next = NULL, | |
8504 | .priority = INT_MAX, /* before any real devices */ | |
8505 | }; | |
8506 | ||
8507 | static void md_geninit(void) | |
8508 | { | |
36a4e1fe | 8509 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8510 | |
c7705f34 | 8511 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8512 | } |
8513 | ||
75c96f85 | 8514 | static int __init md_init(void) |
1da177e4 | 8515 | { |
e804ac78 TH |
8516 | int ret = -ENOMEM; |
8517 | ||
ada609ee | 8518 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8519 | if (!md_wq) |
8520 | goto err_wq; | |
8521 | ||
8522 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8523 | if (!md_misc_wq) | |
8524 | goto err_misc_wq; | |
8525 | ||
8526 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8527 | goto err_md; | |
8528 | ||
8529 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8530 | goto err_mdp; | |
8531 | mdp_major = ret; | |
8532 | ||
3dbd8c2e | 8533 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
8534 | md_probe, NULL, NULL); |
8535 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8536 | md_probe, NULL, NULL); |
8537 | ||
1da177e4 | 8538 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8539 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8540 | |
8541 | md_geninit(); | |
d710e138 | 8542 | return 0; |
1da177e4 | 8543 | |
e804ac78 TH |
8544 | err_mdp: |
8545 | unregister_blkdev(MD_MAJOR, "md"); | |
8546 | err_md: | |
8547 | destroy_workqueue(md_misc_wq); | |
8548 | err_misc_wq: | |
8549 | destroy_workqueue(md_wq); | |
8550 | err_wq: | |
8551 | return ret; | |
8552 | } | |
1da177e4 LT |
8553 | |
8554 | #ifndef MODULE | |
8555 | ||
8556 | /* | |
8557 | * Searches all registered partitions for autorun RAID arrays | |
8558 | * at boot time. | |
8559 | */ | |
4d936ec1 ME |
8560 | |
8561 | static LIST_HEAD(all_detected_devices); | |
8562 | struct detected_devices_node { | |
8563 | struct list_head list; | |
8564 | dev_t dev; | |
8565 | }; | |
1da177e4 LT |
8566 | |
8567 | void md_autodetect_dev(dev_t dev) | |
8568 | { | |
4d936ec1 ME |
8569 | struct detected_devices_node *node_detected_dev; |
8570 | ||
8571 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8572 | if (node_detected_dev) { | |
8573 | node_detected_dev->dev = dev; | |
8574 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8575 | } else { | |
8576 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8577 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8578 | } | |
1da177e4 LT |
8579 | } |
8580 | ||
8581 | ||
8582 | static void autostart_arrays(int part) | |
8583 | { | |
3cb03002 | 8584 | struct md_rdev *rdev; |
4d936ec1 ME |
8585 | struct detected_devices_node *node_detected_dev; |
8586 | dev_t dev; | |
8587 | int i_scanned, i_passed; | |
1da177e4 | 8588 | |
4d936ec1 ME |
8589 | i_scanned = 0; |
8590 | i_passed = 0; | |
1da177e4 | 8591 | |
4d936ec1 | 8592 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8593 | |
4d936ec1 ME |
8594 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8595 | i_scanned++; | |
8596 | node_detected_dev = list_entry(all_detected_devices.next, | |
8597 | struct detected_devices_node, list); | |
8598 | list_del(&node_detected_dev->list); | |
8599 | dev = node_detected_dev->dev; | |
8600 | kfree(node_detected_dev); | |
df968c4e | 8601 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8602 | if (IS_ERR(rdev)) |
8603 | continue; | |
8604 | ||
b2d444d7 | 8605 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
8606 | MD_BUG(); |
8607 | continue; | |
8608 | } | |
d0fae18f | 8609 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8610 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8611 | i_passed++; |
1da177e4 | 8612 | } |
4d936ec1 ME |
8613 | |
8614 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8615 | i_scanned, i_passed); | |
1da177e4 LT |
8616 | |
8617 | autorun_devices(part); | |
8618 | } | |
8619 | ||
fdee8ae4 | 8620 | #endif /* !MODULE */ |
1da177e4 LT |
8621 | |
8622 | static __exit void md_exit(void) | |
8623 | { | |
fd01b88c | 8624 | struct mddev *mddev; |
1da177e4 | 8625 | struct list_head *tmp; |
8ab5e4c1 | 8626 | |
3dbd8c2e | 8627 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 8628 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8629 | |
3dbd8c2e | 8630 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8631 | unregister_blkdev(mdp_major, "mdp"); |
8632 | unregister_reboot_notifier(&md_notifier); | |
8633 | unregister_sysctl_table(raid_table_header); | |
8634 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 8635 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8636 | export_array(mddev); |
d3374825 | 8637 | mddev->hold_active = 0; |
1da177e4 | 8638 | } |
e804ac78 TH |
8639 | destroy_workqueue(md_misc_wq); |
8640 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8641 | } |
8642 | ||
685784aa | 8643 | subsys_initcall(md_init); |
1da177e4 LT |
8644 | module_exit(md_exit) |
8645 | ||
f91de92e N |
8646 | static int get_ro(char *buffer, struct kernel_param *kp) |
8647 | { | |
8648 | return sprintf(buffer, "%d", start_readonly); | |
8649 | } | |
8650 | static int set_ro(const char *val, struct kernel_param *kp) | |
8651 | { | |
8652 | char *e; | |
8653 | int num = simple_strtoul(val, &e, 10); | |
8654 | if (*val && (*e == '\0' || *e == '\n')) { | |
8655 | start_readonly = num; | |
4dbcdc75 | 8656 | return 0; |
f91de92e N |
8657 | } |
8658 | return -EINVAL; | |
8659 | } | |
8660 | ||
80ca3a44 N |
8661 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8662 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 8663 | |
efeb53c0 | 8664 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8665 | |
1da177e4 LT |
8666 | EXPORT_SYMBOL(register_md_personality); |
8667 | EXPORT_SYMBOL(unregister_md_personality); | |
8668 | EXPORT_SYMBOL(md_error); | |
8669 | EXPORT_SYMBOL(md_done_sync); | |
8670 | EXPORT_SYMBOL(md_write_start); | |
8671 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
8672 | EXPORT_SYMBOL(md_register_thread); |
8673 | EXPORT_SYMBOL(md_unregister_thread); | |
8674 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 | 8675 | EXPORT_SYMBOL(md_check_recovery); |
a91d5ac0 | 8676 | EXPORT_SYMBOL(md_reap_sync_thread); |
1da177e4 | 8677 | MODULE_LICENSE("GPL"); |
0efb9e61 | 8678 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8679 | MODULE_ALIAS("md"); |
72008652 | 8680 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |