Commit | Line | Data |
---|---|---|
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 | |
5e56341d AB |
75 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
76 | ||
1e50915f RB |
77 | /* |
78 | * Default number of read corrections we'll attempt on an rdev | |
79 | * before ejecting it from the array. We divide the read error | |
80 | * count by 2 for every hour elapsed between read errors. | |
81 | */ | |
82 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
83 | /* |
84 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
85 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
86 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 87 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
88 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
89 | * speed limit - in case reconstruction slows down your system despite | |
90 | * idle IO detection. | |
91 | * | |
92 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 93 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
94 | */ |
95 | ||
96 | static int sysctl_speed_limit_min = 1000; | |
97 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 98 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
99 | { |
100 | return mddev->sync_speed_min ? | |
101 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
102 | } | |
103 | ||
fd01b88c | 104 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
105 | { |
106 | return mddev->sync_speed_max ? | |
107 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
108 | } | |
1da177e4 LT |
109 | |
110 | static struct ctl_table_header *raid_table_header; | |
111 | ||
112 | static ctl_table raid_table[] = { | |
113 | { | |
1da177e4 LT |
114 | .procname = "speed_limit_min", |
115 | .data = &sysctl_speed_limit_min, | |
116 | .maxlen = sizeof(int), | |
80ca3a44 | 117 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 118 | .proc_handler = proc_dointvec, |
1da177e4 LT |
119 | }, |
120 | { | |
1da177e4 LT |
121 | .procname = "speed_limit_max", |
122 | .data = &sysctl_speed_limit_max, | |
123 | .maxlen = sizeof(int), | |
80ca3a44 | 124 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 125 | .proc_handler = proc_dointvec, |
1da177e4 | 126 | }, |
894d2491 | 127 | { } |
1da177e4 LT |
128 | }; |
129 | ||
130 | static ctl_table raid_dir_table[] = { | |
131 | { | |
1da177e4 LT |
132 | .procname = "raid", |
133 | .maxlen = 0, | |
80ca3a44 | 134 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
135 | .child = raid_table, |
136 | }, | |
894d2491 | 137 | { } |
1da177e4 LT |
138 | }; |
139 | ||
140 | static ctl_table raid_root_table[] = { | |
141 | { | |
1da177e4 LT |
142 | .procname = "dev", |
143 | .maxlen = 0, | |
144 | .mode = 0555, | |
145 | .child = raid_dir_table, | |
146 | }, | |
894d2491 | 147 | { } |
1da177e4 LT |
148 | }; |
149 | ||
83d5cde4 | 150 | static const struct block_device_operations md_fops; |
1da177e4 | 151 | |
f91de92e N |
152 | static int start_readonly; |
153 | ||
a167f663 N |
154 | /* bio_clone_mddev |
155 | * like bio_clone, but with a local bio set | |
156 | */ | |
157 | ||
158 | static void mddev_bio_destructor(struct bio *bio) | |
159 | { | |
fd01b88c | 160 | struct mddev *mddev, **mddevp; |
a167f663 N |
161 | |
162 | mddevp = (void*)bio; | |
163 | mddev = mddevp[-1]; | |
164 | ||
165 | bio_free(bio, mddev->bio_set); | |
166 | } | |
167 | ||
168 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, | |
fd01b88c | 169 | struct mddev *mddev) |
a167f663 N |
170 | { |
171 | struct bio *b; | |
fd01b88c | 172 | struct mddev **mddevp; |
a167f663 N |
173 | |
174 | if (!mddev || !mddev->bio_set) | |
175 | return bio_alloc(gfp_mask, nr_iovecs); | |
176 | ||
177 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, | |
178 | mddev->bio_set); | |
179 | if (!b) | |
180 | return NULL; | |
181 | mddevp = (void*)b; | |
182 | mddevp[-1] = mddev; | |
183 | b->bi_destructor = mddev_bio_destructor; | |
184 | return b; | |
185 | } | |
186 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
187 | ||
188 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 189 | struct mddev *mddev) |
a167f663 N |
190 | { |
191 | struct bio *b; | |
fd01b88c | 192 | struct mddev **mddevp; |
a167f663 N |
193 | |
194 | if (!mddev || !mddev->bio_set) | |
195 | return bio_clone(bio, gfp_mask); | |
196 | ||
197 | b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, | |
198 | mddev->bio_set); | |
199 | if (!b) | |
200 | return NULL; | |
201 | mddevp = (void*)b; | |
202 | mddevp[-1] = mddev; | |
203 | b->bi_destructor = mddev_bio_destructor; | |
204 | __bio_clone(b, bio); | |
205 | if (bio_integrity(bio)) { | |
206 | int ret; | |
207 | ||
208 | ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set); | |
209 | ||
210 | if (ret < 0) { | |
211 | bio_put(b); | |
212 | return NULL; | |
213 | } | |
214 | } | |
215 | ||
216 | return b; | |
217 | } | |
218 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
219 | ||
d2eb35ac N |
220 | void md_trim_bio(struct bio *bio, int offset, int size) |
221 | { | |
222 | /* 'bio' is a cloned bio which we need to trim to match | |
223 | * the given offset and size. | |
224 | * This requires adjusting bi_sector, bi_size, and bi_io_vec | |
225 | */ | |
226 | int i; | |
227 | struct bio_vec *bvec; | |
228 | int sofar = 0; | |
229 | ||
230 | size <<= 9; | |
231 | if (offset == 0 && size == bio->bi_size) | |
232 | return; | |
233 | ||
234 | bio->bi_sector += offset; | |
235 | bio->bi_size = size; | |
236 | offset <<= 9; | |
237 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
238 | ||
239 | while (bio->bi_idx < bio->bi_vcnt && | |
240 | bio->bi_io_vec[bio->bi_idx].bv_len <= offset) { | |
241 | /* remove this whole bio_vec */ | |
242 | offset -= bio->bi_io_vec[bio->bi_idx].bv_len; | |
243 | bio->bi_idx++; | |
244 | } | |
245 | if (bio->bi_idx < bio->bi_vcnt) { | |
246 | bio->bi_io_vec[bio->bi_idx].bv_offset += offset; | |
247 | bio->bi_io_vec[bio->bi_idx].bv_len -= offset; | |
248 | } | |
249 | /* avoid any complications with bi_idx being non-zero*/ | |
250 | if (bio->bi_idx) { | |
251 | memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx, | |
252 | (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec)); | |
253 | bio->bi_vcnt -= bio->bi_idx; | |
254 | bio->bi_idx = 0; | |
255 | } | |
256 | /* Make sure vcnt and last bv are not too big */ | |
257 | bio_for_each_segment(bvec, bio, i) { | |
258 | if (sofar + bvec->bv_len > size) | |
259 | bvec->bv_len = size - sofar; | |
260 | if (bvec->bv_len == 0) { | |
261 | bio->bi_vcnt = i; | |
262 | break; | |
263 | } | |
264 | sofar += bvec->bv_len; | |
265 | } | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(md_trim_bio); | |
268 | ||
d7603b7e N |
269 | /* |
270 | * We have a system wide 'event count' that is incremented | |
271 | * on any 'interesting' event, and readers of /proc/mdstat | |
272 | * can use 'poll' or 'select' to find out when the event | |
273 | * count increases. | |
274 | * | |
275 | * Events are: | |
276 | * start array, stop array, error, add device, remove device, | |
277 | * start build, activate spare | |
278 | */ | |
2989ddbd | 279 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 280 | static atomic_t md_event_count; |
fd01b88c | 281 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
282 | { |
283 | atomic_inc(&md_event_count); | |
284 | wake_up(&md_event_waiters); | |
285 | } | |
29269553 | 286 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 287 | |
c331eb04 N |
288 | /* Alternate version that can be called from interrupts |
289 | * when calling sysfs_notify isn't needed. | |
290 | */ | |
fd01b88c | 291 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
292 | { |
293 | atomic_inc(&md_event_count); | |
294 | wake_up(&md_event_waiters); | |
295 | } | |
296 | ||
1da177e4 LT |
297 | /* |
298 | * Enables to iterate over all existing md arrays | |
299 | * all_mddevs_lock protects this list. | |
300 | */ | |
301 | static LIST_HEAD(all_mddevs); | |
302 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
303 | ||
304 | ||
305 | /* | |
306 | * iterates through all used mddevs in the system. | |
307 | * We take care to grab the all_mddevs_lock whenever navigating | |
308 | * the list, and to always hold a refcount when unlocked. | |
309 | * Any code which breaks out of this loop while own | |
310 | * a reference to the current mddev and must mddev_put it. | |
311 | */ | |
fd01b88c | 312 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 LT |
313 | \ |
314 | for (({ spin_lock(&all_mddevs_lock); \ | |
fd01b88c N |
315 | _tmp = all_mddevs.next; \ |
316 | _mddev = NULL;}); \ | |
317 | ({ if (_tmp != &all_mddevs) \ | |
318 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 319 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
320 | if (_mddev) mddev_put(_mddev); \ |
321 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
322 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 323 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 324 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
325 | ) |
326 | ||
327 | ||
409c57f3 N |
328 | /* Rather than calling directly into the personality make_request function, |
329 | * IO requests come here first so that we can check if the device is | |
330 | * being suspended pending a reconfiguration. | |
331 | * We hold a refcount over the call to ->make_request. By the time that | |
332 | * call has finished, the bio has been linked into some internal structure | |
333 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
334 | */ | |
5a7bbad2 | 335 | static void md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 336 | { |
49077326 | 337 | const int rw = bio_data_dir(bio); |
fd01b88c | 338 | struct mddev *mddev = q->queuedata; |
49077326 | 339 | int cpu; |
e91ece55 | 340 | unsigned int sectors; |
49077326 | 341 | |
0ca69886 N |
342 | if (mddev == NULL || mddev->pers == NULL |
343 | || !mddev->ready) { | |
409c57f3 | 344 | bio_io_error(bio); |
5a7bbad2 | 345 | return; |
409c57f3 | 346 | } |
0ca69886 | 347 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 348 | rcu_read_lock(); |
e9c7469b | 349 | if (mddev->suspended) { |
409c57f3 N |
350 | DEFINE_WAIT(__wait); |
351 | for (;;) { | |
352 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
353 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 354 | if (!mddev->suspended) |
409c57f3 N |
355 | break; |
356 | rcu_read_unlock(); | |
357 | schedule(); | |
358 | rcu_read_lock(); | |
359 | } | |
360 | finish_wait(&mddev->sb_wait, &__wait); | |
361 | } | |
362 | atomic_inc(&mddev->active_io); | |
363 | rcu_read_unlock(); | |
49077326 | 364 | |
e91ece55 CM |
365 | /* |
366 | * save the sectors now since our bio can | |
367 | * go away inside make_request | |
368 | */ | |
369 | sectors = bio_sectors(bio); | |
5a7bbad2 | 370 | mddev->pers->make_request(mddev, bio); |
49077326 N |
371 | |
372 | cpu = part_stat_lock(); | |
373 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
e91ece55 | 374 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); |
49077326 N |
375 | part_stat_unlock(); |
376 | ||
409c57f3 N |
377 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
378 | wake_up(&mddev->sb_wait); | |
409c57f3 N |
379 | } |
380 | ||
9e35b99c N |
381 | /* mddev_suspend makes sure no new requests are submitted |
382 | * to the device, and that any requests that have been submitted | |
383 | * are completely handled. | |
384 | * Once ->stop is called and completes, the module will be completely | |
385 | * unused. | |
386 | */ | |
fd01b88c | 387 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
388 | { |
389 | BUG_ON(mddev->suspended); | |
390 | mddev->suspended = 1; | |
391 | synchronize_rcu(); | |
392 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
393 | mddev->pers->quiesce(mddev, 1); | |
0d9f4f13 JB |
394 | |
395 | del_timer_sync(&mddev->safemode_timer); | |
409c57f3 | 396 | } |
390ee602 | 397 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 398 | |
fd01b88c | 399 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
400 | { |
401 | mddev->suspended = 0; | |
402 | wake_up(&mddev->sb_wait); | |
403 | mddev->pers->quiesce(mddev, 0); | |
0fd018af JB |
404 | |
405 | md_wakeup_thread(mddev->thread); | |
406 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 407 | } |
390ee602 | 408 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 409 | |
fd01b88c | 410 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 N |
411 | { |
412 | return mddev->suspended; | |
413 | } | |
414 | EXPORT_SYMBOL(mddev_congested); | |
415 | ||
a2826aa9 | 416 | /* |
e9c7469b | 417 | * Generic flush handling for md |
a2826aa9 N |
418 | */ |
419 | ||
e9c7469b | 420 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 | 421 | { |
3cb03002 | 422 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 423 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
424 | |
425 | rdev_dec_pending(rdev, mddev); | |
426 | ||
427 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 428 | /* The pre-request flush has finished */ |
e804ac78 | 429 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
430 | } |
431 | bio_put(bio); | |
432 | } | |
433 | ||
a7a07e69 N |
434 | static void md_submit_flush_data(struct work_struct *ws); |
435 | ||
a035fc3e | 436 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 437 | { |
fd01b88c | 438 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 439 | struct md_rdev *rdev; |
a2826aa9 | 440 | |
a7a07e69 N |
441 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
442 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 | 443 | rcu_read_lock(); |
dafb20fa | 444 | rdev_for_each_rcu(rdev, mddev) |
a2826aa9 N |
445 | if (rdev->raid_disk >= 0 && |
446 | !test_bit(Faulty, &rdev->flags)) { | |
447 | /* Take two references, one is dropped | |
448 | * when request finishes, one after | |
449 | * we reclaim rcu_read_lock | |
450 | */ | |
451 | struct bio *bi; | |
452 | atomic_inc(&rdev->nr_pending); | |
453 | atomic_inc(&rdev->nr_pending); | |
454 | rcu_read_unlock(); | |
b5e1b8ce | 455 | bi = bio_alloc_mddev(GFP_NOIO, 0, mddev); |
e9c7469b | 456 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
457 | bi->bi_private = rdev; |
458 | bi->bi_bdev = rdev->bdev; | |
459 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 460 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
461 | rcu_read_lock(); |
462 | rdev_dec_pending(rdev, mddev); | |
463 | } | |
464 | rcu_read_unlock(); | |
a7a07e69 N |
465 | if (atomic_dec_and_test(&mddev->flush_pending)) |
466 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
467 | } |
468 | ||
e9c7469b | 469 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 470 | { |
fd01b88c | 471 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 472 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 473 | |
e9c7469b | 474 | if (bio->bi_size == 0) |
a2826aa9 N |
475 | /* an empty barrier - all done */ |
476 | bio_endio(bio, 0); | |
477 | else { | |
e9c7469b | 478 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 479 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 480 | } |
2b74e12e N |
481 | |
482 | mddev->flush_bio = NULL; | |
483 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
484 | } |
485 | ||
fd01b88c | 486 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 N |
487 | { |
488 | spin_lock_irq(&mddev->write_lock); | |
489 | wait_event_lock_irq(mddev->sb_wait, | |
e9c7469b | 490 | !mddev->flush_bio, |
a2826aa9 | 491 | mddev->write_lock, /*nothing*/); |
e9c7469b | 492 | mddev->flush_bio = bio; |
a2826aa9 N |
493 | spin_unlock_irq(&mddev->write_lock); |
494 | ||
a035fc3e N |
495 | INIT_WORK(&mddev->flush_work, submit_flushes); |
496 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 497 | } |
e9c7469b | 498 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 499 | |
97658cdd N |
500 | /* Support for plugging. |
501 | * This mirrors the plugging support in request_queue, but does not | |
502 | * require having a whole queue or request structures. | |
503 | * We allocate an md_plug_cb for each md device and each thread it gets | |
504 | * plugged on. This links tot the private plug_handle structure in the | |
505 | * personality data where we keep a count of the number of outstanding | |
506 | * plugs so other code can see if a plug is active. | |
507 | */ | |
508 | struct md_plug_cb { | |
509 | struct blk_plug_cb cb; | |
fd01b88c | 510 | struct mddev *mddev; |
97658cdd N |
511 | }; |
512 | ||
513 | static void plugger_unplug(struct blk_plug_cb *cb) | |
514 | { | |
515 | struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb); | |
516 | if (atomic_dec_and_test(&mdcb->mddev->plug_cnt)) | |
517 | md_wakeup_thread(mdcb->mddev->thread); | |
518 | kfree(mdcb); | |
519 | } | |
520 | ||
521 | /* Check that an unplug wakeup will come shortly. | |
522 | * If not, wakeup the md thread immediately | |
523 | */ | |
fd01b88c | 524 | int mddev_check_plugged(struct mddev *mddev) |
97658cdd N |
525 | { |
526 | struct blk_plug *plug = current->plug; | |
527 | struct md_plug_cb *mdcb; | |
528 | ||
529 | if (!plug) | |
530 | return 0; | |
531 | ||
532 | list_for_each_entry(mdcb, &plug->cb_list, cb.list) { | |
533 | if (mdcb->cb.callback == plugger_unplug && | |
534 | mdcb->mddev == mddev) { | |
535 | /* Already on the list, move to top */ | |
536 | if (mdcb != list_first_entry(&plug->cb_list, | |
537 | struct md_plug_cb, | |
538 | cb.list)) | |
539 | list_move(&mdcb->cb.list, &plug->cb_list); | |
540 | return 1; | |
541 | } | |
542 | } | |
543 | /* Not currently on the callback list */ | |
544 | mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC); | |
545 | if (!mdcb) | |
546 | return 0; | |
547 | ||
548 | mdcb->mddev = mddev; | |
549 | mdcb->cb.callback = plugger_unplug; | |
550 | atomic_inc(&mddev->plug_cnt); | |
551 | list_add(&mdcb->cb.list, &plug->cb_list); | |
552 | return 1; | |
553 | } | |
554 | EXPORT_SYMBOL_GPL(mddev_check_plugged); | |
2ac87401 | 555 | |
fd01b88c | 556 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
557 | { |
558 | atomic_inc(&mddev->active); | |
559 | return mddev; | |
560 | } | |
561 | ||
5fd3a17e | 562 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 563 | |
fd01b88c | 564 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 565 | { |
a167f663 N |
566 | struct bio_set *bs = NULL; |
567 | ||
1da177e4 LT |
568 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
569 | return; | |
d3374825 | 570 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
571 | mddev->ctime == 0 && !mddev->hold_active) { |
572 | /* Array is not configured at all, and not held active, | |
573 | * so destroy it */ | |
af8a2434 | 574 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
575 | bs = mddev->bio_set; |
576 | mddev->bio_set = NULL; | |
d3374825 | 577 | if (mddev->gendisk) { |
e804ac78 TH |
578 | /* We did a probe so need to clean up. Call |
579 | * queue_work inside the spinlock so that | |
580 | * flush_workqueue() after mddev_find will | |
581 | * succeed in waiting for the work to be done. | |
d3374825 N |
582 | */ |
583 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 584 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
585 | } else |
586 | kfree(mddev); | |
587 | } | |
588 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
589 | if (bs) |
590 | bioset_free(bs); | |
1da177e4 LT |
591 | } |
592 | ||
fd01b88c | 593 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
594 | { |
595 | mutex_init(&mddev->open_mutex); | |
596 | mutex_init(&mddev->reconfig_mutex); | |
597 | mutex_init(&mddev->bitmap_info.mutex); | |
598 | INIT_LIST_HEAD(&mddev->disks); | |
599 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
600 | init_timer(&mddev->safemode_timer); | |
601 | atomic_set(&mddev->active, 1); | |
602 | atomic_set(&mddev->openers, 0); | |
603 | atomic_set(&mddev->active_io, 0); | |
97658cdd | 604 | atomic_set(&mddev->plug_cnt, 0); |
fafd7fb0 N |
605 | spin_lock_init(&mddev->write_lock); |
606 | atomic_set(&mddev->flush_pending, 0); | |
607 | init_waitqueue_head(&mddev->sb_wait); | |
608 | init_waitqueue_head(&mddev->recovery_wait); | |
609 | mddev->reshape_position = MaxSector; | |
2c810cdd | 610 | mddev->reshape_backwards = 0; |
fafd7fb0 N |
611 | mddev->resync_min = 0; |
612 | mddev->resync_max = MaxSector; | |
613 | mddev->level = LEVEL_NONE; | |
614 | } | |
390ee602 | 615 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 616 | |
fd01b88c | 617 | static struct mddev * mddev_find(dev_t unit) |
1da177e4 | 618 | { |
fd01b88c | 619 | struct mddev *mddev, *new = NULL; |
1da177e4 | 620 | |
8f5f02c4 N |
621 | if (unit && MAJOR(unit) != MD_MAJOR) |
622 | unit &= ~((1<<MdpMinorShift)-1); | |
623 | ||
1da177e4 LT |
624 | retry: |
625 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
626 | |
627 | if (unit) { | |
628 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
629 | if (mddev->unit == unit) { | |
630 | mddev_get(mddev); | |
631 | spin_unlock(&all_mddevs_lock); | |
632 | kfree(new); | |
633 | return mddev; | |
634 | } | |
635 | ||
636 | if (new) { | |
637 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 638 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
639 | new->hold_active = UNTIL_IOCTL; |
640 | return new; | |
1da177e4 | 641 | } |
efeb53c0 N |
642 | } else if (new) { |
643 | /* find an unused unit number */ | |
644 | static int next_minor = 512; | |
645 | int start = next_minor; | |
646 | int is_free = 0; | |
647 | int dev = 0; | |
648 | while (!is_free) { | |
649 | dev = MKDEV(MD_MAJOR, next_minor); | |
650 | next_minor++; | |
651 | if (next_minor > MINORMASK) | |
652 | next_minor = 0; | |
653 | if (next_minor == start) { | |
654 | /* Oh dear, all in use. */ | |
655 | spin_unlock(&all_mddevs_lock); | |
656 | kfree(new); | |
657 | return NULL; | |
658 | } | |
659 | ||
660 | is_free = 1; | |
661 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
662 | if (mddev->unit == dev) { | |
663 | is_free = 0; | |
664 | break; | |
665 | } | |
666 | } | |
667 | new->unit = dev; | |
668 | new->md_minor = MINOR(dev); | |
669 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
670 | list_add(&new->all_mddevs, &all_mddevs); |
671 | spin_unlock(&all_mddevs_lock); | |
672 | return new; | |
673 | } | |
674 | spin_unlock(&all_mddevs_lock); | |
675 | ||
9ffae0cf | 676 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
677 | if (!new) |
678 | return NULL; | |
679 | ||
1da177e4 LT |
680 | new->unit = unit; |
681 | if (MAJOR(unit) == MD_MAJOR) | |
682 | new->md_minor = MINOR(unit); | |
683 | else | |
684 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
685 | ||
fafd7fb0 | 686 | mddev_init(new); |
1da177e4 | 687 | |
1da177e4 LT |
688 | goto retry; |
689 | } | |
690 | ||
fd01b88c | 691 | static inline int mddev_lock(struct mddev * mddev) |
1da177e4 | 692 | { |
df5b89b3 | 693 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
694 | } |
695 | ||
fd01b88c | 696 | static inline int mddev_is_locked(struct mddev *mddev) |
b522adcd DW |
697 | { |
698 | return mutex_is_locked(&mddev->reconfig_mutex); | |
699 | } | |
700 | ||
fd01b88c | 701 | static inline int mddev_trylock(struct mddev * mddev) |
1da177e4 | 702 | { |
df5b89b3 | 703 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
704 | } |
705 | ||
b6eb127d N |
706 | static struct attribute_group md_redundancy_group; |
707 | ||
fd01b88c | 708 | static void mddev_unlock(struct mddev * mddev) |
1da177e4 | 709 | { |
a64c876f | 710 | if (mddev->to_remove) { |
b6eb127d N |
711 | /* These cannot be removed under reconfig_mutex as |
712 | * an access to the files will try to take reconfig_mutex | |
713 | * while holding the file unremovable, which leads to | |
714 | * a deadlock. | |
bb4f1e9d N |
715 | * So hold set sysfs_active while the remove in happeing, |
716 | * and anything else which might set ->to_remove or my | |
717 | * otherwise change the sysfs namespace will fail with | |
718 | * -EBUSY if sysfs_active is still set. | |
719 | * We set sysfs_active under reconfig_mutex and elsewhere | |
720 | * test it under the same mutex to ensure its correct value | |
721 | * is seen. | |
b6eb127d | 722 | */ |
a64c876f N |
723 | struct attribute_group *to_remove = mddev->to_remove; |
724 | mddev->to_remove = NULL; | |
bb4f1e9d | 725 | mddev->sysfs_active = 1; |
b6eb127d N |
726 | mutex_unlock(&mddev->reconfig_mutex); |
727 | ||
00bcb4ac N |
728 | if (mddev->kobj.sd) { |
729 | if (to_remove != &md_redundancy_group) | |
730 | sysfs_remove_group(&mddev->kobj, to_remove); | |
731 | if (mddev->pers == NULL || | |
732 | mddev->pers->sync_request == NULL) { | |
733 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
734 | if (mddev->sysfs_action) | |
735 | sysfs_put(mddev->sysfs_action); | |
736 | mddev->sysfs_action = NULL; | |
737 | } | |
a64c876f | 738 | } |
bb4f1e9d | 739 | mddev->sysfs_active = 0; |
b6eb127d N |
740 | } else |
741 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 742 | |
751e67ca CD |
743 | /* As we've dropped the mutex we need a spinlock to |
744 | * make sure the thread doesn't disappear | |
01f96c0a N |
745 | */ |
746 | spin_lock(&pers_lock); | |
005eca5e | 747 | md_wakeup_thread(mddev->thread); |
01f96c0a | 748 | spin_unlock(&pers_lock); |
1da177e4 LT |
749 | } |
750 | ||
fd01b88c | 751 | static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr) |
1da177e4 | 752 | { |
3cb03002 | 753 | struct md_rdev *rdev; |
1da177e4 | 754 | |
dafb20fa | 755 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
756 | if (rdev->desc_nr == nr) |
757 | return rdev; | |
159ec1fc | 758 | |
1da177e4 LT |
759 | return NULL; |
760 | } | |
761 | ||
fd01b88c | 762 | static struct md_rdev * find_rdev(struct mddev * mddev, dev_t dev) |
1da177e4 | 763 | { |
3cb03002 | 764 | struct md_rdev *rdev; |
1da177e4 | 765 | |
dafb20fa | 766 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
767 | if (rdev->bdev->bd_dev == dev) |
768 | return rdev; | |
159ec1fc | 769 | |
1da177e4 LT |
770 | return NULL; |
771 | } | |
772 | ||
84fc4b56 | 773 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 774 | { |
84fc4b56 | 775 | struct md_personality *pers; |
d9d166c2 N |
776 | list_for_each_entry(pers, &pers_list, list) { |
777 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 778 | return pers; |
d9d166c2 N |
779 | if (strcmp(pers->name, clevel)==0) |
780 | return pers; | |
781 | } | |
2604b703 N |
782 | return NULL; |
783 | } | |
784 | ||
b73df2d3 | 785 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 786 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 787 | { |
57b2caa3 | 788 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 789 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
790 | } |
791 | ||
3cb03002 | 792 | static int alloc_disk_sb(struct md_rdev * rdev) |
1da177e4 LT |
793 | { |
794 | if (rdev->sb_page) | |
795 | MD_BUG(); | |
796 | ||
797 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
798 | if (!rdev->sb_page) { | |
799 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 800 | return -ENOMEM; |
1da177e4 LT |
801 | } |
802 | ||
803 | return 0; | |
804 | } | |
805 | ||
545c8795 | 806 | void md_rdev_clear(struct md_rdev *rdev) |
1da177e4 LT |
807 | { |
808 | if (rdev->sb_page) { | |
2d1f3b5d | 809 | put_page(rdev->sb_page); |
1da177e4 LT |
810 | rdev->sb_loaded = 0; |
811 | rdev->sb_page = NULL; | |
0f420358 | 812 | rdev->sb_start = 0; |
dd8ac336 | 813 | rdev->sectors = 0; |
1da177e4 | 814 | } |
2699b672 N |
815 | if (rdev->bb_page) { |
816 | put_page(rdev->bb_page); | |
817 | rdev->bb_page = NULL; | |
818 | } | |
1da177e4 | 819 | } |
545c8795 | 820 | EXPORT_SYMBOL_GPL(md_rdev_clear); |
1da177e4 | 821 | |
6712ecf8 | 822 | static void super_written(struct bio *bio, int error) |
7bfa19f2 | 823 | { |
3cb03002 | 824 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 825 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 826 | |
3a0f5bbb N |
827 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
828 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
829 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
830 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 831 | md_error(mddev, rdev); |
3a0f5bbb | 832 | } |
7bfa19f2 | 833 | |
a9701a30 N |
834 | if (atomic_dec_and_test(&mddev->pending_writes)) |
835 | wake_up(&mddev->sb_wait); | |
f8b58edf | 836 | bio_put(bio); |
7bfa19f2 N |
837 | } |
838 | ||
fd01b88c | 839 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
840 | sector_t sector, int size, struct page *page) |
841 | { | |
842 | /* write first size bytes of page to sector of rdev | |
843 | * Increment mddev->pending_writes before returning | |
844 | * and decrement it on completion, waking up sb_wait | |
845 | * if zero is reached. | |
846 | * If an error occurred, call md_error | |
847 | */ | |
a167f663 | 848 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 849 | |
a6ff7e08 | 850 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
7bfa19f2 N |
851 | bio->bi_sector = sector; |
852 | bio_add_page(bio, page, size, 0); | |
853 | bio->bi_private = rdev; | |
854 | bio->bi_end_io = super_written; | |
a9701a30 | 855 | |
7bfa19f2 | 856 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 857 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
858 | } |
859 | ||
fd01b88c | 860 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 861 | { |
e9c7469b | 862 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
863 | DEFINE_WAIT(wq); |
864 | for(;;) { | |
865 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
866 | if (atomic_read(&mddev->pending_writes)==0) | |
867 | break; | |
a9701a30 N |
868 | schedule(); |
869 | } | |
870 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
871 | } |
872 | ||
6712ecf8 | 873 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 874 | { |
1da177e4 | 875 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
876 | } |
877 | ||
3cb03002 | 878 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 879 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 880 | { |
a167f663 | 881 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
882 | struct completion event; |
883 | int ret; | |
884 | ||
721a9602 | 885 | rw |= REQ_SYNC; |
1da177e4 | 886 | |
a6ff7e08 JB |
887 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
888 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 JB |
889 | if (metadata_op) |
890 | bio->bi_sector = sector + rdev->sb_start; | |
1fdd6fc9 N |
891 | else if (rdev->mddev->reshape_position != MaxSector && |
892 | (rdev->mddev->reshape_backwards == | |
893 | (sector >= rdev->mddev->reshape_position))) | |
894 | bio->bi_sector = sector + rdev->new_data_offset; | |
ccebd4c4 JB |
895 | else |
896 | bio->bi_sector = sector + rdev->data_offset; | |
1da177e4 LT |
897 | bio_add_page(bio, page, size, 0); |
898 | init_completion(&event); | |
899 | bio->bi_private = &event; | |
900 | bio->bi_end_io = bi_complete; | |
901 | submit_bio(rw, bio); | |
902 | wait_for_completion(&event); | |
903 | ||
904 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
905 | bio_put(bio); | |
906 | return ret; | |
907 | } | |
a8745db2 | 908 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 909 | |
3cb03002 | 910 | static int read_disk_sb(struct md_rdev * rdev, int size) |
1da177e4 LT |
911 | { |
912 | char b[BDEVNAME_SIZE]; | |
913 | if (!rdev->sb_page) { | |
914 | MD_BUG(); | |
915 | return -EINVAL; | |
916 | } | |
917 | if (rdev->sb_loaded) | |
918 | return 0; | |
919 | ||
920 | ||
ccebd4c4 | 921 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
922 | goto fail; |
923 | rdev->sb_loaded = 1; | |
924 | return 0; | |
925 | ||
926 | fail: | |
927 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
928 | bdevname(rdev->bdev,b)); | |
929 | return -EINVAL; | |
930 | } | |
931 | ||
932 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
933 | { | |
05710466 AN |
934 | return sb1->set_uuid0 == sb2->set_uuid0 && |
935 | sb1->set_uuid1 == sb2->set_uuid1 && | |
936 | sb1->set_uuid2 == sb2->set_uuid2 && | |
937 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
938 | } |
939 | ||
1da177e4 LT |
940 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
941 | { | |
942 | int ret; | |
943 | mdp_super_t *tmp1, *tmp2; | |
944 | ||
945 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
946 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
947 | ||
948 | if (!tmp1 || !tmp2) { | |
949 | ret = 0; | |
35020f1a | 950 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
951 | goto abort; |
952 | } | |
953 | ||
954 | *tmp1 = *sb1; | |
955 | *tmp2 = *sb2; | |
956 | ||
957 | /* | |
958 | * nr_disks is not constant | |
959 | */ | |
960 | tmp1->nr_disks = 0; | |
961 | tmp2->nr_disks = 0; | |
962 | ||
ce0c8e05 | 963 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 964 | abort: |
990a8baf JJ |
965 | kfree(tmp1); |
966 | kfree(tmp2); | |
1da177e4 LT |
967 | return ret; |
968 | } | |
969 | ||
4d167f09 N |
970 | |
971 | static u32 md_csum_fold(u32 csum) | |
972 | { | |
973 | csum = (csum & 0xffff) + (csum >> 16); | |
974 | return (csum & 0xffff) + (csum >> 16); | |
975 | } | |
976 | ||
1da177e4 LT |
977 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
978 | { | |
4d167f09 N |
979 | u64 newcsum = 0; |
980 | u32 *sb32 = (u32*)sb; | |
981 | int i; | |
1da177e4 LT |
982 | unsigned int disk_csum, csum; |
983 | ||
984 | disk_csum = sb->sb_csum; | |
985 | sb->sb_csum = 0; | |
4d167f09 N |
986 | |
987 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
988 | newcsum += sb32[i]; | |
989 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
990 | ||
991 | ||
992 | #ifdef CONFIG_ALPHA | |
993 | /* This used to use csum_partial, which was wrong for several | |
994 | * reasons including that different results are returned on | |
995 | * different architectures. It isn't critical that we get exactly | |
996 | * the same return value as before (we always csum_fold before | |
997 | * testing, and that removes any differences). However as we | |
998 | * know that csum_partial always returned a 16bit value on | |
999 | * alphas, do a fold to maximise conformity to previous behaviour. | |
1000 | */ | |
1001 | sb->sb_csum = md_csum_fold(disk_csum); | |
1002 | #else | |
1da177e4 | 1003 | sb->sb_csum = disk_csum; |
4d167f09 | 1004 | #endif |
1da177e4 LT |
1005 | return csum; |
1006 | } | |
1007 | ||
1008 | ||
1009 | /* | |
1010 | * Handle superblock details. | |
1011 | * We want to be able to handle multiple superblock formats | |
1012 | * so we have a common interface to them all, and an array of | |
1013 | * different handlers. | |
1014 | * We rely on user-space to write the initial superblock, and support | |
1015 | * reading and updating of superblocks. | |
1016 | * Interface methods are: | |
3cb03002 | 1017 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1018 | * loads and validates a superblock on dev. |
1019 | * if refdev != NULL, compare superblocks on both devices | |
1020 | * Return: | |
1021 | * 0 - dev has a superblock that is compatible with refdev | |
1022 | * 1 - dev has a superblock that is compatible and newer than refdev | |
1023 | * so dev should be used as the refdev in future | |
1024 | * -EINVAL superblock incompatible or invalid | |
1025 | * -othererror e.g. -EIO | |
1026 | * | |
fd01b88c | 1027 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
1028 | * Verify that dev is acceptable into mddev. |
1029 | * The first time, mddev->raid_disks will be 0, and data from | |
1030 | * dev should be merged in. Subsequent calls check that dev | |
1031 | * is new enough. Return 0 or -EINVAL | |
1032 | * | |
fd01b88c | 1033 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
1034 | * Update the superblock for rdev with data in mddev |
1035 | * This does not write to disc. | |
1036 | * | |
1037 | */ | |
1038 | ||
1039 | struct super_type { | |
0cd17fec CW |
1040 | char *name; |
1041 | struct module *owner; | |
c6563a8c N |
1042 | int (*load_super)(struct md_rdev *rdev, |
1043 | struct md_rdev *refdev, | |
0cd17fec | 1044 | int minor_version); |
c6563a8c N |
1045 | int (*validate_super)(struct mddev *mddev, |
1046 | struct md_rdev *rdev); | |
1047 | void (*sync_super)(struct mddev *mddev, | |
1048 | struct md_rdev *rdev); | |
3cb03002 | 1049 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 1050 | sector_t num_sectors); |
c6563a8c N |
1051 | int (*allow_new_offset)(struct md_rdev *rdev, |
1052 | unsigned long long new_offset); | |
1da177e4 LT |
1053 | }; |
1054 | ||
0894cc30 AN |
1055 | /* |
1056 | * Check that the given mddev has no bitmap. | |
1057 | * | |
1058 | * This function is called from the run method of all personalities that do not | |
1059 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
1060 | * has a bitmap. Otherwise, it returns 0. | |
1061 | * | |
1062 | */ | |
fd01b88c | 1063 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 1064 | { |
c3d9714e | 1065 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
1066 | return 0; |
1067 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
1068 | mdname(mddev), mddev->pers->name); | |
1069 | return 1; | |
1070 | } | |
1071 | EXPORT_SYMBOL(md_check_no_bitmap); | |
1072 | ||
1da177e4 LT |
1073 | /* |
1074 | * load_super for 0.90.0 | |
1075 | */ | |
3cb03002 | 1076 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1077 | { |
1078 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
1079 | mdp_super_t *sb; | |
1080 | int ret; | |
1da177e4 LT |
1081 | |
1082 | /* | |
0f420358 | 1083 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
1084 | * it's at the end of the disk. |
1085 | * | |
1086 | * It also happens to be a multiple of 4Kb. | |
1087 | */ | |
57b2caa3 | 1088 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 1089 | |
0002b271 | 1090 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
1091 | if (ret) return ret; |
1092 | ||
1093 | ret = -EINVAL; | |
1094 | ||
1095 | bdevname(rdev->bdev, b); | |
65a06f06 | 1096 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1097 | |
1098 | if (sb->md_magic != MD_SB_MAGIC) { | |
1099 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
1100 | b); | |
1101 | goto abort; | |
1102 | } | |
1103 | ||
1104 | if (sb->major_version != 0 || | |
f6705578 N |
1105 | sb->minor_version < 90 || |
1106 | sb->minor_version > 91) { | |
1da177e4 LT |
1107 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1108 | sb->major_version, sb->minor_version, | |
1109 | b); | |
1110 | goto abort; | |
1111 | } | |
1112 | ||
1113 | if (sb->raid_disks <= 0) | |
1114 | goto abort; | |
1115 | ||
4d167f09 | 1116 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1117 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1118 | b); | |
1119 | goto abort; | |
1120 | } | |
1121 | ||
1122 | rdev->preferred_minor = sb->md_minor; | |
1123 | rdev->data_offset = 0; | |
c6563a8c | 1124 | rdev->new_data_offset = 0; |
0002b271 | 1125 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1126 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1127 | |
1128 | if (sb->level == LEVEL_MULTIPATH) | |
1129 | rdev->desc_nr = -1; | |
1130 | else | |
1131 | rdev->desc_nr = sb->this_disk.number; | |
1132 | ||
9a7b2b0f | 1133 | if (!refdev) { |
1da177e4 | 1134 | ret = 1; |
9a7b2b0f | 1135 | } else { |
1da177e4 | 1136 | __u64 ev1, ev2; |
65a06f06 | 1137 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1138 | if (!uuid_equal(refsb, sb)) { |
1139 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1140 | b, bdevname(refdev->bdev,b2)); | |
1141 | goto abort; | |
1142 | } | |
1143 | if (!sb_equal(refsb, sb)) { | |
1144 | printk(KERN_WARNING "md: %s has same UUID" | |
1145 | " but different superblock to %s\n", | |
1146 | b, bdevname(refdev->bdev, b2)); | |
1147 | goto abort; | |
1148 | } | |
1149 | ev1 = md_event(sb); | |
1150 | ev2 = md_event(refsb); | |
1151 | if (ev1 > ev2) | |
1152 | ret = 1; | |
1153 | else | |
1154 | ret = 0; | |
1155 | } | |
8190e754 | 1156 | rdev->sectors = rdev->sb_start; |
27a7b260 N |
1157 | /* Limit to 4TB as metadata cannot record more than that */ |
1158 | if (rdev->sectors >= (2ULL << 32)) | |
1159 | rdev->sectors = (2ULL << 32) - 2; | |
1da177e4 | 1160 | |
27a7b260 | 1161 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1162 | /* "this cannot possibly happen" ... */ |
1163 | ret = -EINVAL; | |
1164 | ||
1da177e4 LT |
1165 | abort: |
1166 | return ret; | |
1167 | } | |
1168 | ||
1169 | /* | |
1170 | * validate_super for 0.90.0 | |
1171 | */ | |
fd01b88c | 1172 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1173 | { |
1174 | mdp_disk_t *desc; | |
65a06f06 | 1175 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1176 | __u64 ev1 = md_event(sb); |
1da177e4 | 1177 | |
41158c7e | 1178 | rdev->raid_disk = -1; |
c5d79adb N |
1179 | clear_bit(Faulty, &rdev->flags); |
1180 | clear_bit(In_sync, &rdev->flags); | |
1181 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1182 | |
1da177e4 LT |
1183 | if (mddev->raid_disks == 0) { |
1184 | mddev->major_version = 0; | |
1185 | mddev->minor_version = sb->minor_version; | |
1186 | mddev->patch_version = sb->patch_version; | |
e691063a | 1187 | mddev->external = 0; |
9d8f0363 | 1188 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1189 | mddev->ctime = sb->ctime; |
1190 | mddev->utime = sb->utime; | |
1191 | mddev->level = sb->level; | |
d9d166c2 | 1192 | mddev->clevel[0] = 0; |
1da177e4 LT |
1193 | mddev->layout = sb->layout; |
1194 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1195 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1196 | mddev->events = ev1; |
c3d9714e N |
1197 | mddev->bitmap_info.offset = 0; |
1198 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
2c810cdd | 1199 | mddev->reshape_backwards = 0; |
1da177e4 | 1200 | |
f6705578 N |
1201 | if (mddev->minor_version >= 91) { |
1202 | mddev->reshape_position = sb->reshape_position; | |
1203 | mddev->delta_disks = sb->delta_disks; | |
1204 | mddev->new_level = sb->new_level; | |
1205 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1206 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
2c810cdd N |
1207 | if (mddev->delta_disks < 0) |
1208 | mddev->reshape_backwards = 1; | |
f6705578 N |
1209 | } else { |
1210 | mddev->reshape_position = MaxSector; | |
1211 | mddev->delta_disks = 0; | |
1212 | mddev->new_level = mddev->level; | |
1213 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1214 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1215 | } |
1216 | ||
1da177e4 LT |
1217 | if (sb->state & (1<<MD_SB_CLEAN)) |
1218 | mddev->recovery_cp = MaxSector; | |
1219 | else { | |
1220 | if (sb->events_hi == sb->cp_events_hi && | |
1221 | sb->events_lo == sb->cp_events_lo) { | |
1222 | mddev->recovery_cp = sb->recovery_cp; | |
1223 | } else | |
1224 | mddev->recovery_cp = 0; | |
1225 | } | |
1226 | ||
1227 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1228 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1229 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1230 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1231 | ||
1232 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1233 | |
1234 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1235 | mddev->bitmap_info.file == NULL) |
1236 | mddev->bitmap_info.offset = | |
1237 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1238 | |
41158c7e | 1239 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1240 | /* Insist on good event counter while assembling, except |
1241 | * for spares (which don't need an event count) */ | |
1da177e4 | 1242 | ++ev1; |
be6800a7 N |
1243 | if (sb->disks[rdev->desc_nr].state & ( |
1244 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1245 | if (ev1 < mddev->events) | |
1246 | return -EINVAL; | |
41158c7e N |
1247 | } else if (mddev->bitmap) { |
1248 | /* if adding to array with a bitmap, then we can accept an | |
1249 | * older device ... but not too old. | |
1250 | */ | |
41158c7e N |
1251 | if (ev1 < mddev->bitmap->events_cleared) |
1252 | return 0; | |
07d84d10 N |
1253 | } else { |
1254 | if (ev1 < mddev->events) | |
1255 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1256 | return 0; | |
1257 | } | |
41158c7e | 1258 | |
1da177e4 | 1259 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1260 | desc = sb->disks + rdev->desc_nr; |
1261 | ||
1262 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1263 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1264 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1265 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1266 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1267 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1268 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1269 | /* active but not in sync implies recovery up to | |
1270 | * reshape position. We don't know exactly where | |
1271 | * that is, so set to zero for now */ | |
1272 | if (mddev->minor_version >= 91) { | |
1273 | rdev->recovery_offset = 0; | |
1274 | rdev->raid_disk = desc->raid_disk; | |
1275 | } | |
1da177e4 | 1276 | } |
8ddf9efe N |
1277 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1278 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1279 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1280 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1281 | return 0; |
1282 | } | |
1283 | ||
1284 | /* | |
1285 | * sync_super for 0.90.0 | |
1286 | */ | |
fd01b88c | 1287 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1288 | { |
1289 | mdp_super_t *sb; | |
3cb03002 | 1290 | struct md_rdev *rdev2; |
1da177e4 | 1291 | int next_spare = mddev->raid_disks; |
19133a42 | 1292 | |
1da177e4 LT |
1293 | |
1294 | /* make rdev->sb match mddev data.. | |
1295 | * | |
1296 | * 1/ zero out disks | |
1297 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1298 | * 3/ any empty disks < next_spare become removed | |
1299 | * | |
1300 | * disks[0] gets initialised to REMOVED because | |
1301 | * we cannot be sure from other fields if it has | |
1302 | * been initialised or not. | |
1303 | */ | |
1304 | int i; | |
1305 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1306 | ||
61181565 N |
1307 | rdev->sb_size = MD_SB_BYTES; |
1308 | ||
65a06f06 | 1309 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1310 | |
1311 | memset(sb, 0, sizeof(*sb)); | |
1312 | ||
1313 | sb->md_magic = MD_SB_MAGIC; | |
1314 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1315 | sb->patch_version = mddev->patch_version; |
1316 | sb->gvalid_words = 0; /* ignored */ | |
1317 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1318 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1319 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1320 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1321 | ||
1322 | sb->ctime = mddev->ctime; | |
1323 | sb->level = mddev->level; | |
58c0fed4 | 1324 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1325 | sb->raid_disks = mddev->raid_disks; |
1326 | sb->md_minor = mddev->md_minor; | |
e691063a | 1327 | sb->not_persistent = 0; |
1da177e4 LT |
1328 | sb->utime = mddev->utime; |
1329 | sb->state = 0; | |
1330 | sb->events_hi = (mddev->events>>32); | |
1331 | sb->events_lo = (u32)mddev->events; | |
1332 | ||
f6705578 N |
1333 | if (mddev->reshape_position == MaxSector) |
1334 | sb->minor_version = 90; | |
1335 | else { | |
1336 | sb->minor_version = 91; | |
1337 | sb->reshape_position = mddev->reshape_position; | |
1338 | sb->new_level = mddev->new_level; | |
1339 | sb->delta_disks = mddev->delta_disks; | |
1340 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1341 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1342 | } |
1343 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1344 | if (mddev->in_sync) |
1345 | { | |
1346 | sb->recovery_cp = mddev->recovery_cp; | |
1347 | sb->cp_events_hi = (mddev->events>>32); | |
1348 | sb->cp_events_lo = (u32)mddev->events; | |
1349 | if (mddev->recovery_cp == MaxSector) | |
1350 | sb->state = (1<< MD_SB_CLEAN); | |
1351 | } else | |
1352 | sb->recovery_cp = 0; | |
1353 | ||
1354 | sb->layout = mddev->layout; | |
9d8f0363 | 1355 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1356 | |
c3d9714e | 1357 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1358 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1359 | ||
1da177e4 | 1360 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
dafb20fa | 1361 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1362 | mdp_disk_t *d; |
86e6ffdd | 1363 | int desc_nr; |
0261cd9f N |
1364 | int is_active = test_bit(In_sync, &rdev2->flags); |
1365 | ||
1366 | if (rdev2->raid_disk >= 0 && | |
1367 | sb->minor_version >= 91) | |
1368 | /* we have nowhere to store the recovery_offset, | |
1369 | * but if it is not below the reshape_position, | |
1370 | * we can piggy-back on that. | |
1371 | */ | |
1372 | is_active = 1; | |
1373 | if (rdev2->raid_disk < 0 || | |
1374 | test_bit(Faulty, &rdev2->flags)) | |
1375 | is_active = 0; | |
1376 | if (is_active) | |
86e6ffdd | 1377 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1378 | else |
86e6ffdd | 1379 | desc_nr = next_spare++; |
19133a42 | 1380 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1381 | d = &sb->disks[rdev2->desc_nr]; |
1382 | nr_disks++; | |
1383 | d->number = rdev2->desc_nr; | |
1384 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1385 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1386 | if (is_active) |
1da177e4 LT |
1387 | d->raid_disk = rdev2->raid_disk; |
1388 | else | |
1389 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1390 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1391 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1392 | else if (is_active) { |
1da177e4 | 1393 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1394 | if (test_bit(In_sync, &rdev2->flags)) |
1395 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1396 | active++; |
1397 | working++; | |
1398 | } else { | |
1399 | d->state = 0; | |
1400 | spare++; | |
1401 | working++; | |
1402 | } | |
8ddf9efe N |
1403 | if (test_bit(WriteMostly, &rdev2->flags)) |
1404 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1405 | } |
1da177e4 LT |
1406 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1407 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1408 | mdp_disk_t *d = &sb->disks[i]; | |
1409 | if (d->state == 0 && d->number == 0) { | |
1410 | d->number = i; | |
1411 | d->raid_disk = i; | |
1412 | d->state = (1<<MD_DISK_REMOVED); | |
1413 | d->state |= (1<<MD_DISK_FAULTY); | |
1414 | failed++; | |
1415 | } | |
1416 | } | |
1417 | sb->nr_disks = nr_disks; | |
1418 | sb->active_disks = active; | |
1419 | sb->working_disks = working; | |
1420 | sb->failed_disks = failed; | |
1421 | sb->spare_disks = spare; | |
1422 | ||
1423 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1424 | sb->sb_csum = calc_sb_csum(sb); | |
1425 | } | |
1426 | ||
0cd17fec CW |
1427 | /* |
1428 | * rdev_size_change for 0.90.0 | |
1429 | */ | |
1430 | static unsigned long long | |
3cb03002 | 1431 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1432 | { |
58c0fed4 | 1433 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1434 | return 0; /* component must fit device */ |
c3d9714e | 1435 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1436 | return 0; /* can't move bitmap */ |
57b2caa3 | 1437 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1438 | if (!num_sectors || num_sectors > rdev->sb_start) |
1439 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1440 | /* Limit to 4TB as metadata cannot record more than that. |
1441 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1442 | */ | |
1443 | if (num_sectors >= (2ULL << 32)) | |
1444 | num_sectors = (2ULL << 32) - 2; | |
0f420358 | 1445 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1446 | rdev->sb_page); |
1447 | md_super_wait(rdev->mddev); | |
c26a44ed | 1448 | return num_sectors; |
0cd17fec CW |
1449 | } |
1450 | ||
c6563a8c N |
1451 | static int |
1452 | super_90_allow_new_offset(struct md_rdev *rdev, unsigned long long new_offset) | |
1453 | { | |
1454 | /* non-zero offset changes not possible with v0.90 */ | |
1455 | return new_offset == 0; | |
1456 | } | |
0cd17fec | 1457 | |
1da177e4 LT |
1458 | /* |
1459 | * version 1 superblock | |
1460 | */ | |
1461 | ||
1c05b4bc | 1462 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1463 | { |
1c05b4bc N |
1464 | __le32 disk_csum; |
1465 | u32 csum; | |
1da177e4 LT |
1466 | unsigned long long newcsum; |
1467 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1468 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1469 | int i; |
1470 | ||
1471 | disk_csum = sb->sb_csum; | |
1472 | sb->sb_csum = 0; | |
1473 | newcsum = 0; | |
1474 | for (i=0; size>=4; size -= 4 ) | |
1475 | newcsum += le32_to_cpu(*isuper++); | |
1476 | ||
1477 | if (size == 2) | |
1c05b4bc | 1478 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1479 | |
1480 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1481 | sb->sb_csum = disk_csum; | |
1482 | return cpu_to_le32(csum); | |
1483 | } | |
1484 | ||
2699b672 N |
1485 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1486 | int acknowledged); | |
3cb03002 | 1487 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1488 | { |
1489 | struct mdp_superblock_1 *sb; | |
1490 | int ret; | |
0f420358 | 1491 | sector_t sb_start; |
c6563a8c | 1492 | sector_t sectors; |
1da177e4 | 1493 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1494 | int bmask; |
1da177e4 LT |
1495 | |
1496 | /* | |
0f420358 | 1497 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1498 | * It is always aligned to a 4K boundary and |
1499 | * depeding on minor_version, it can be: | |
1500 | * 0: At least 8K, but less than 12K, from end of device | |
1501 | * 1: At start of device | |
1502 | * 2: 4K from start of device. | |
1503 | */ | |
1504 | switch(minor_version) { | |
1505 | case 0: | |
77304d2a | 1506 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1507 | sb_start -= 8*2; |
1508 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1509 | break; |
1510 | case 1: | |
0f420358 | 1511 | sb_start = 0; |
1da177e4 LT |
1512 | break; |
1513 | case 2: | |
0f420358 | 1514 | sb_start = 8; |
1da177e4 LT |
1515 | break; |
1516 | default: | |
1517 | return -EINVAL; | |
1518 | } | |
0f420358 | 1519 | rdev->sb_start = sb_start; |
1da177e4 | 1520 | |
0002b271 N |
1521 | /* superblock is rarely larger than 1K, but it can be larger, |
1522 | * and it is safe to read 4k, so we do that | |
1523 | */ | |
1524 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1525 | if (ret) return ret; |
1526 | ||
1527 | ||
65a06f06 | 1528 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1529 | |
1530 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1531 | sb->major_version != cpu_to_le32(1) || | |
1532 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1533 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1534 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1535 | return -EINVAL; |
1536 | ||
1537 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1538 | printk("md: invalid superblock checksum on %s\n", | |
1539 | bdevname(rdev->bdev,b)); | |
1540 | return -EINVAL; | |
1541 | } | |
1542 | if (le64_to_cpu(sb->data_size) < 10) { | |
1543 | printk("md: data_size too small on %s\n", | |
1544 | bdevname(rdev->bdev,b)); | |
1545 | return -EINVAL; | |
1546 | } | |
c6563a8c N |
1547 | if (sb->pad0 || |
1548 | sb->pad3[0] || | |
1549 | memcmp(sb->pad3, sb->pad3+1, sizeof(sb->pad3) - sizeof(sb->pad3[1]))) | |
1550 | /* Some padding is non-zero, might be a new feature */ | |
1551 | return -EINVAL; | |
e11e93fa | 1552 | |
1da177e4 LT |
1553 | rdev->preferred_minor = 0xffff; |
1554 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
c6563a8c N |
1555 | rdev->new_data_offset = rdev->data_offset; |
1556 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE) && | |
1557 | (le32_to_cpu(sb->feature_map) & MD_FEATURE_NEW_OFFSET)) | |
1558 | rdev->new_data_offset += (s32)le32_to_cpu(sb->new_offset); | |
4dbcdc75 | 1559 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1560 | |
0002b271 | 1561 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1562 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1563 | if (rdev->sb_size & bmask) |
a1801f85 N |
1564 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1565 | ||
1566 | if (minor_version | |
0f420358 | 1567 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1568 | return -EINVAL; |
c6563a8c N |
1569 | if (minor_version |
1570 | && rdev->new_data_offset < sb_start + (rdev->sb_size/512)) | |
1571 | return -EINVAL; | |
0002b271 | 1572 | |
31b65a0d N |
1573 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1574 | rdev->desc_nr = -1; | |
1575 | else | |
1576 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1577 | ||
2699b672 N |
1578 | if (!rdev->bb_page) { |
1579 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1580 | if (!rdev->bb_page) | |
1581 | return -ENOMEM; | |
1582 | } | |
1583 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1584 | rdev->badblocks.count == 0) { | |
1585 | /* need to load the bad block list. | |
1586 | * Currently we limit it to one page. | |
1587 | */ | |
1588 | s32 offset; | |
1589 | sector_t bb_sector; | |
1590 | u64 *bbp; | |
1591 | int i; | |
1592 | int sectors = le16_to_cpu(sb->bblog_size); | |
1593 | if (sectors > (PAGE_SIZE / 512)) | |
1594 | return -EINVAL; | |
1595 | offset = le32_to_cpu(sb->bblog_offset); | |
1596 | if (offset == 0) | |
1597 | return -EINVAL; | |
1598 | bb_sector = (long long)offset; | |
1599 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1600 | rdev->bb_page, READ, true)) | |
1601 | return -EIO; | |
1602 | bbp = (u64 *)page_address(rdev->bb_page); | |
1603 | rdev->badblocks.shift = sb->bblog_shift; | |
1604 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1605 | u64 bb = le64_to_cpu(*bbp); | |
1606 | int count = bb & (0x3ff); | |
1607 | u64 sector = bb >> 10; | |
1608 | sector <<= sb->bblog_shift; | |
1609 | count <<= sb->bblog_shift; | |
1610 | if (bb + 1 == 0) | |
1611 | break; | |
1612 | if (md_set_badblocks(&rdev->badblocks, | |
1613 | sector, count, 1) == 0) | |
1614 | return -EINVAL; | |
1615 | } | |
1616 | } else if (sb->bblog_offset == 0) | |
1617 | rdev->badblocks.shift = -1; | |
1618 | ||
9a7b2b0f | 1619 | if (!refdev) { |
8ed75463 | 1620 | ret = 1; |
9a7b2b0f | 1621 | } else { |
1da177e4 | 1622 | __u64 ev1, ev2; |
65a06f06 | 1623 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1624 | |
1625 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1626 | sb->level != refsb->level || | |
1627 | sb->layout != refsb->layout || | |
1628 | sb->chunksize != refsb->chunksize) { | |
1629 | printk(KERN_WARNING "md: %s has strangely different" | |
1630 | " superblock to %s\n", | |
1631 | bdevname(rdev->bdev,b), | |
1632 | bdevname(refdev->bdev,b2)); | |
1633 | return -EINVAL; | |
1634 | } | |
1635 | ev1 = le64_to_cpu(sb->events); | |
1636 | ev2 = le64_to_cpu(refsb->events); | |
1637 | ||
1638 | if (ev1 > ev2) | |
8ed75463 N |
1639 | ret = 1; |
1640 | else | |
1641 | ret = 0; | |
1da177e4 | 1642 | } |
c6563a8c N |
1643 | if (minor_version) { |
1644 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9); | |
1645 | sectors -= rdev->data_offset; | |
1646 | } else | |
1647 | sectors = rdev->sb_start; | |
1648 | if (sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1649 | return -EINVAL; |
dd8ac336 | 1650 | rdev->sectors = le64_to_cpu(sb->data_size); |
8ed75463 | 1651 | return ret; |
1da177e4 LT |
1652 | } |
1653 | ||
fd01b88c | 1654 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1655 | { |
65a06f06 | 1656 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1657 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1658 | |
41158c7e | 1659 | rdev->raid_disk = -1; |
c5d79adb N |
1660 | clear_bit(Faulty, &rdev->flags); |
1661 | clear_bit(In_sync, &rdev->flags); | |
1662 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1663 | |
1da177e4 LT |
1664 | if (mddev->raid_disks == 0) { |
1665 | mddev->major_version = 1; | |
1666 | mddev->patch_version = 0; | |
e691063a | 1667 | mddev->external = 0; |
9d8f0363 | 1668 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1669 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1670 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1671 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1672 | mddev->clevel[0] = 0; |
1da177e4 LT |
1673 | mddev->layout = le32_to_cpu(sb->layout); |
1674 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1675 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1676 | mddev->events = ev1; |
c3d9714e N |
1677 | mddev->bitmap_info.offset = 0; |
1678 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
2c810cdd N |
1679 | mddev->reshape_backwards = 0; |
1680 | ||
1da177e4 LT |
1681 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); |
1682 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1683 | ||
1684 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1685 | |
71c0805c | 1686 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1687 | mddev->bitmap_info.file == NULL ) |
1688 | mddev->bitmap_info.offset = | |
1689 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1690 | |
f6705578 N |
1691 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1692 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1693 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1694 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1695 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1696 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
2c810cdd N |
1697 | if (mddev->delta_disks < 0 || |
1698 | (mddev->delta_disks == 0 && | |
1699 | (le32_to_cpu(sb->feature_map) | |
1700 | & MD_FEATURE_RESHAPE_BACKWARDS))) | |
1701 | mddev->reshape_backwards = 1; | |
f6705578 N |
1702 | } else { |
1703 | mddev->reshape_position = MaxSector; | |
1704 | mddev->delta_disks = 0; | |
1705 | mddev->new_level = mddev->level; | |
1706 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1707 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1708 | } |
1709 | ||
41158c7e | 1710 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1711 | /* Insist of good event counter while assembling, except for |
1712 | * spares (which don't need an event count) */ | |
1da177e4 | 1713 | ++ev1; |
be6800a7 N |
1714 | if (rdev->desc_nr >= 0 && |
1715 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1716 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1717 | if (ev1 < mddev->events) | |
1718 | return -EINVAL; | |
41158c7e N |
1719 | } else if (mddev->bitmap) { |
1720 | /* If adding to array with a bitmap, then we can accept an | |
1721 | * older device, but not too old. | |
1722 | */ | |
41158c7e N |
1723 | if (ev1 < mddev->bitmap->events_cleared) |
1724 | return 0; | |
07d84d10 N |
1725 | } else { |
1726 | if (ev1 < mddev->events) | |
1727 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1728 | return 0; | |
1729 | } | |
1da177e4 LT |
1730 | if (mddev->level != LEVEL_MULTIPATH) { |
1731 | int role; | |
3673f305 N |
1732 | if (rdev->desc_nr < 0 || |
1733 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1734 | role = 0xffff; | |
1735 | rdev->desc_nr = -1; | |
1736 | } else | |
1737 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1738 | switch(role) { |
1739 | case 0xffff: /* spare */ | |
1da177e4 LT |
1740 | break; |
1741 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1742 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1743 | break; |
1744 | default: | |
5fd6c1dc N |
1745 | if ((le32_to_cpu(sb->feature_map) & |
1746 | MD_FEATURE_RECOVERY_OFFSET)) | |
1747 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1748 | else | |
1749 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1750 | rdev->raid_disk = role; |
1751 | break; | |
1752 | } | |
8ddf9efe N |
1753 | if (sb->devflags & WriteMostly1) |
1754 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1755 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1756 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1757 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1758 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1759 | |
1da177e4 LT |
1760 | return 0; |
1761 | } | |
1762 | ||
fd01b88c | 1763 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1764 | { |
1765 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1766 | struct md_rdev *rdev2; |
1da177e4 LT |
1767 | int max_dev, i; |
1768 | /* make rdev->sb match mddev and rdev data. */ | |
1769 | ||
65a06f06 | 1770 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1771 | |
1772 | sb->feature_map = 0; | |
1773 | sb->pad0 = 0; | |
5fd6c1dc | 1774 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1775 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1776 | ||
1777 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1778 | sb->events = cpu_to_le64(mddev->events); | |
1779 | if (mddev->in_sync) | |
1780 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1781 | else | |
1782 | sb->resync_offset = cpu_to_le64(0); | |
1783 | ||
1c05b4bc | 1784 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1785 | |
f0ca340c | 1786 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1787 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1788 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1789 | sb->level = cpu_to_le32(mddev->level); |
1790 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1791 | |
aeb9b211 N |
1792 | if (test_bit(WriteMostly, &rdev->flags)) |
1793 | sb->devflags |= WriteMostly1; | |
1794 | else | |
1795 | sb->devflags &= ~WriteMostly1; | |
c6563a8c N |
1796 | sb->data_offset = cpu_to_le64(rdev->data_offset); |
1797 | sb->data_size = cpu_to_le64(rdev->sectors); | |
aeb9b211 | 1798 | |
c3d9714e N |
1799 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1800 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1801 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1802 | } |
5fd6c1dc N |
1803 | |
1804 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1805 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1806 | sb->feature_map |= |
1807 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1808 | sb->recovery_offset = | |
1809 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc | 1810 | } |
2d78f8c4 N |
1811 | if (test_bit(Replacement, &rdev->flags)) |
1812 | sb->feature_map |= | |
1813 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1814 | |
f6705578 N |
1815 | if (mddev->reshape_position != MaxSector) { |
1816 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1817 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1818 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1819 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1820 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1821 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
2c810cdd N |
1822 | if (mddev->delta_disks == 0 && |
1823 | mddev->reshape_backwards) | |
1824 | sb->feature_map | |
1825 | |= cpu_to_le32(MD_FEATURE_RESHAPE_BACKWARDS); | |
c6563a8c N |
1826 | if (rdev->new_data_offset != rdev->data_offset) { |
1827 | sb->feature_map | |
1828 | |= cpu_to_le32(MD_FEATURE_NEW_OFFSET); | |
1829 | sb->new_offset = cpu_to_le32((__u32)(rdev->new_data_offset | |
1830 | - rdev->data_offset)); | |
1831 | } | |
f6705578 | 1832 | } |
a654b9d8 | 1833 | |
2699b672 N |
1834 | if (rdev->badblocks.count == 0) |
1835 | /* Nothing to do for bad blocks*/ ; | |
1836 | else if (sb->bblog_offset == 0) | |
1837 | /* Cannot record bad blocks on this device */ | |
1838 | md_error(mddev, rdev); | |
1839 | else { | |
1840 | struct badblocks *bb = &rdev->badblocks; | |
1841 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1842 | u64 *p = bb->page; | |
1843 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1844 | if (bb->changed) { | |
1845 | unsigned seq; | |
1846 | ||
1847 | retry: | |
1848 | seq = read_seqbegin(&bb->lock); | |
1849 | ||
1850 | memset(bbp, 0xff, PAGE_SIZE); | |
1851 | ||
1852 | for (i = 0 ; i < bb->count ; i++) { | |
1853 | u64 internal_bb = *p++; | |
1854 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) | |
1855 | | BB_LEN(internal_bb)); | |
1856 | *bbp++ = cpu_to_le64(store_bb); | |
1857 | } | |
d0962936 | 1858 | bb->changed = 0; |
2699b672 N |
1859 | if (read_seqretry(&bb->lock, seq)) |
1860 | goto retry; | |
1861 | ||
1862 | bb->sector = (rdev->sb_start + | |
1863 | (int)le32_to_cpu(sb->bblog_offset)); | |
1864 | bb->size = le16_to_cpu(sb->bblog_size); | |
2699b672 N |
1865 | } |
1866 | } | |
1867 | ||
1da177e4 | 1868 | max_dev = 0; |
dafb20fa | 1869 | rdev_for_each(rdev2, mddev) |
1da177e4 LT |
1870 | if (rdev2->desc_nr+1 > max_dev) |
1871 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1872 | |
70471daf N |
1873 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1874 | int bmask; | |
a778b73f | 1875 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1876 | rdev->sb_size = max_dev * 2 + 256; |
1877 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1878 | if (rdev->sb_size & bmask) | |
1879 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1880 | } else |
1881 | max_dev = le32_to_cpu(sb->max_dev); | |
1882 | ||
1da177e4 LT |
1883 | for (i=0; i<max_dev;i++) |
1884 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1885 | ||
dafb20fa | 1886 | rdev_for_each(rdev2, mddev) { |
1da177e4 | 1887 | i = rdev2->desc_nr; |
b2d444d7 | 1888 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1889 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1890 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1891 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1892 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1893 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1894 | else |
1895 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1896 | } | |
1897 | ||
1da177e4 LT |
1898 | sb->sb_csum = calc_sb_1_csum(sb); |
1899 | } | |
1900 | ||
0cd17fec | 1901 | static unsigned long long |
3cb03002 | 1902 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1903 | { |
1904 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1905 | sector_t max_sectors; |
58c0fed4 | 1906 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1907 | return 0; /* component must fit device */ |
c6563a8c N |
1908 | if (rdev->data_offset != rdev->new_data_offset) |
1909 | return 0; /* too confusing */ | |
0f420358 | 1910 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1911 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1912 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1913 | max_sectors -= rdev->data_offset; |
1914 | if (!num_sectors || num_sectors > max_sectors) | |
1915 | num_sectors = max_sectors; | |
c3d9714e | 1916 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1917 | /* minor version 0 with bitmap we can't move */ |
1918 | return 0; | |
1919 | } else { | |
1920 | /* minor version 0; superblock after data */ | |
0f420358 | 1921 | sector_t sb_start; |
77304d2a | 1922 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1923 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1924 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1925 | if (!num_sectors || num_sectors > max_sectors) |
1926 | num_sectors = max_sectors; | |
0f420358 | 1927 | rdev->sb_start = sb_start; |
0cd17fec | 1928 | } |
65a06f06 | 1929 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1930 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1931 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1932 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1933 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1934 | rdev->sb_page); |
1935 | md_super_wait(rdev->mddev); | |
c26a44ed | 1936 | return num_sectors; |
c6563a8c N |
1937 | |
1938 | } | |
1939 | ||
1940 | static int | |
1941 | super_1_allow_new_offset(struct md_rdev *rdev, | |
1942 | unsigned long long new_offset) | |
1943 | { | |
1944 | /* All necessary checks on new >= old have been done */ | |
1945 | struct bitmap *bitmap; | |
1946 | if (new_offset >= rdev->data_offset) | |
1947 | return 1; | |
1948 | ||
1949 | /* with 1.0 metadata, there is no metadata to tread on | |
1950 | * so we can always move back */ | |
1951 | if (rdev->mddev->minor_version == 0) | |
1952 | return 1; | |
1953 | ||
1954 | /* otherwise we must be sure not to step on | |
1955 | * any metadata, so stay: | |
1956 | * 36K beyond start of superblock | |
1957 | * beyond end of badblocks | |
1958 | * beyond write-intent bitmap | |
1959 | */ | |
1960 | if (rdev->sb_start + (32+4)*2 > new_offset) | |
1961 | return 0; | |
1962 | bitmap = rdev->mddev->bitmap; | |
1963 | if (bitmap && !rdev->mddev->bitmap_info.file && | |
1964 | rdev->sb_start + rdev->mddev->bitmap_info.offset + | |
1965 | bitmap->file_pages * (PAGE_SIZE>>9) > new_offset) | |
1966 | return 0; | |
1967 | if (rdev->badblocks.sector + rdev->badblocks.size > new_offset) | |
1968 | return 0; | |
1969 | ||
1970 | return 1; | |
0cd17fec | 1971 | } |
1da177e4 | 1972 | |
75c96f85 | 1973 | static struct super_type super_types[] = { |
1da177e4 LT |
1974 | [0] = { |
1975 | .name = "0.90.0", | |
1976 | .owner = THIS_MODULE, | |
0cd17fec CW |
1977 | .load_super = super_90_load, |
1978 | .validate_super = super_90_validate, | |
1979 | .sync_super = super_90_sync, | |
1980 | .rdev_size_change = super_90_rdev_size_change, | |
c6563a8c | 1981 | .allow_new_offset = super_90_allow_new_offset, |
1da177e4 LT |
1982 | }, |
1983 | [1] = { | |
1984 | .name = "md-1", | |
1985 | .owner = THIS_MODULE, | |
0cd17fec CW |
1986 | .load_super = super_1_load, |
1987 | .validate_super = super_1_validate, | |
1988 | .sync_super = super_1_sync, | |
1989 | .rdev_size_change = super_1_rdev_size_change, | |
c6563a8c | 1990 | .allow_new_offset = super_1_allow_new_offset, |
1da177e4 LT |
1991 | }, |
1992 | }; | |
1da177e4 | 1993 | |
fd01b88c | 1994 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1995 | { |
1996 | if (mddev->sync_super) { | |
1997 | mddev->sync_super(mddev, rdev); | |
1998 | return; | |
1999 | } | |
2000 | ||
2001 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
2002 | ||
2003 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
2004 | } | |
2005 | ||
fd01b88c | 2006 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 2007 | { |
3cb03002 | 2008 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 2009 | |
4b80991c N |
2010 | rcu_read_lock(); |
2011 | rdev_for_each_rcu(rdev, mddev1) | |
2012 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 2013 | if (rdev->bdev->bd_contains == |
4b80991c N |
2014 | rdev2->bdev->bd_contains) { |
2015 | rcu_read_unlock(); | |
7dd5e7c3 | 2016 | return 1; |
4b80991c N |
2017 | } |
2018 | rcu_read_unlock(); | |
1da177e4 LT |
2019 | return 0; |
2020 | } | |
2021 | ||
2022 | static LIST_HEAD(pending_raid_disks); | |
2023 | ||
ac5e7113 AN |
2024 | /* |
2025 | * Try to register data integrity profile for an mddev | |
2026 | * | |
2027 | * This is called when an array is started and after a disk has been kicked | |
2028 | * from the array. It only succeeds if all working and active component devices | |
2029 | * are integrity capable with matching profiles. | |
2030 | */ | |
fd01b88c | 2031 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 2032 | { |
3cb03002 | 2033 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
2034 | |
2035 | if (list_empty(&mddev->disks)) | |
2036 | return 0; /* nothing to do */ | |
629acb6a JB |
2037 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
2038 | return 0; /* shouldn't register, or already is */ | |
dafb20fa | 2039 | rdev_for_each(rdev, mddev) { |
ac5e7113 AN |
2040 | /* skip spares and non-functional disks */ |
2041 | if (test_bit(Faulty, &rdev->flags)) | |
2042 | continue; | |
2043 | if (rdev->raid_disk < 0) | |
2044 | continue; | |
ac5e7113 AN |
2045 | if (!reference) { |
2046 | /* Use the first rdev as the reference */ | |
2047 | reference = rdev; | |
2048 | continue; | |
2049 | } | |
2050 | /* does this rdev's profile match the reference profile? */ | |
2051 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
2052 | rdev->bdev->bd_disk) < 0) | |
2053 | return -EINVAL; | |
2054 | } | |
89078d57 MP |
2055 | if (!reference || !bdev_get_integrity(reference->bdev)) |
2056 | return 0; | |
ac5e7113 AN |
2057 | /* |
2058 | * All component devices are integrity capable and have matching | |
2059 | * profiles, register the common profile for the md device. | |
2060 | */ | |
2061 | if (blk_integrity_register(mddev->gendisk, | |
2062 | bdev_get_integrity(reference->bdev)) != 0) { | |
2063 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
2064 | mdname(mddev)); | |
2065 | return -EINVAL; | |
2066 | } | |
a91a2785 MP |
2067 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
2068 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
2069 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
2070 | mdname(mddev)); | |
2071 | return -EINVAL; | |
2072 | } | |
ac5e7113 AN |
2073 | return 0; |
2074 | } | |
2075 | EXPORT_SYMBOL(md_integrity_register); | |
2076 | ||
2077 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 2078 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 2079 | { |
3f9d99c1 | 2080 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 2081 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 2082 | |
ac5e7113 | 2083 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 2084 | return; |
ac5e7113 | 2085 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 2086 | return; |
ac5e7113 AN |
2087 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2088 | rdev->bdev->bd_disk) >= 0) | |
2089 | return; | |
2090 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2091 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2092 | } |
ac5e7113 | 2093 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2094 | |
fd01b88c | 2095 | static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev) |
1da177e4 | 2096 | { |
7dd5e7c3 | 2097 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2098 | struct kobject *ko; |
1edf80d3 | 2099 | char *s; |
5e55e2f5 | 2100 | int err; |
1da177e4 LT |
2101 | |
2102 | if (rdev->mddev) { | |
2103 | MD_BUG(); | |
2104 | return -EINVAL; | |
2105 | } | |
11e2ede0 DW |
2106 | |
2107 | /* prevent duplicates */ | |
2108 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2109 | return -EEXIST; | |
2110 | ||
dd8ac336 AN |
2111 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2112 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2113 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2114 | if (mddev->pers) { |
2115 | /* Cannot change size, so fail | |
2116 | * If mddev->level <= 0, then we don't care | |
2117 | * about aligning sizes (e.g. linear) | |
2118 | */ | |
2119 | if (mddev->level > 0) | |
2120 | return -ENOSPC; | |
2121 | } else | |
dd8ac336 | 2122 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2123 | } |
1da177e4 LT |
2124 | |
2125 | /* Verify rdev->desc_nr is unique. | |
2126 | * If it is -1, assign a free number, else | |
2127 | * check number is not in use | |
2128 | */ | |
2129 | if (rdev->desc_nr < 0) { | |
2130 | int choice = 0; | |
2131 | if (mddev->pers) choice = mddev->raid_disks; | |
2132 | while (find_rdev_nr(mddev, choice)) | |
2133 | choice++; | |
2134 | rdev->desc_nr = choice; | |
2135 | } else { | |
2136 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
2137 | return -EBUSY; | |
2138 | } | |
de01dfad N |
2139 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2140 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2141 | mdname(mddev), mddev->max_disks); | |
2142 | return -EBUSY; | |
2143 | } | |
19133a42 | 2144 | bdevname(rdev->bdev,b); |
649316b2 | 2145 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2146 | *s = '!'; |
649316b2 | 2147 | |
1da177e4 | 2148 | rdev->mddev = mddev; |
19133a42 | 2149 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2150 | |
b2d6db58 | 2151 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2152 | goto fail; |
86e6ffdd | 2153 | |
0762b8bd | 2154 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2155 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2156 | /* failure here is OK */; | |
2157 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2158 | |
4b80991c | 2159 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2160 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2161 | |
2162 | /* May as well allow recovery to be retried once */ | |
5389042f | 2163 | mddev->recovery_disabled++; |
3f9d99c1 | 2164 | |
1da177e4 | 2165 | return 0; |
5e55e2f5 N |
2166 | |
2167 | fail: | |
2168 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2169 | b, mdname(mddev)); | |
2170 | return err; | |
1da177e4 LT |
2171 | } |
2172 | ||
177a99b2 | 2173 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2174 | { |
3cb03002 | 2175 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2176 | kobject_del(&rdev->kobj); |
177a99b2 | 2177 | kobject_put(&rdev->kobj); |
5792a285 N |
2178 | } |
2179 | ||
3cb03002 | 2180 | static void unbind_rdev_from_array(struct md_rdev * rdev) |
1da177e4 LT |
2181 | { |
2182 | char b[BDEVNAME_SIZE]; | |
2183 | if (!rdev->mddev) { | |
2184 | MD_BUG(); | |
2185 | return; | |
2186 | } | |
49731baa | 2187 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2188 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2189 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2190 | rdev->mddev = NULL; | |
86e6ffdd | 2191 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2192 | sysfs_put(rdev->sysfs_state); |
2193 | rdev->sysfs_state = NULL; | |
2230dfe4 N |
2194 | kfree(rdev->badblocks.page); |
2195 | rdev->badblocks.count = 0; | |
2196 | rdev->badblocks.page = NULL; | |
5792a285 | 2197 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2198 | * writing to 'remove' to "dev/state". We also need |
2199 | * to delay it due to rcu usage. | |
5792a285 | 2200 | */ |
4b80991c | 2201 | synchronize_rcu(); |
177a99b2 N |
2202 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2203 | kobject_get(&rdev->kobj); | |
e804ac78 | 2204 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2205 | } |
2206 | ||
2207 | /* | |
2208 | * prevent the device from being mounted, repartitioned or | |
2209 | * otherwise reused by a RAID array (or any other kernel | |
2210 | * subsystem), by bd_claiming the device. | |
2211 | */ | |
3cb03002 | 2212 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2213 | { |
2214 | int err = 0; | |
2215 | struct block_device *bdev; | |
2216 | char b[BDEVNAME_SIZE]; | |
2217 | ||
d4d77629 | 2218 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2219 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2220 | if (IS_ERR(bdev)) { |
2221 | printk(KERN_ERR "md: could not open %s.\n", | |
2222 | __bdevname(dev, b)); | |
2223 | return PTR_ERR(bdev); | |
2224 | } | |
1da177e4 LT |
2225 | rdev->bdev = bdev; |
2226 | return err; | |
2227 | } | |
2228 | ||
3cb03002 | 2229 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2230 | { |
2231 | struct block_device *bdev = rdev->bdev; | |
2232 | rdev->bdev = NULL; | |
2233 | if (!bdev) | |
2234 | MD_BUG(); | |
e525fd89 | 2235 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2236 | } |
2237 | ||
2238 | void md_autodetect_dev(dev_t dev); | |
2239 | ||
3cb03002 | 2240 | static void export_rdev(struct md_rdev * rdev) |
1da177e4 LT |
2241 | { |
2242 | char b[BDEVNAME_SIZE]; | |
2243 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
2244 | bdevname(rdev->bdev,b)); | |
2245 | if (rdev->mddev) | |
2246 | MD_BUG(); | |
545c8795 | 2247 | md_rdev_clear(rdev); |
1da177e4 | 2248 | #ifndef MODULE |
d0fae18f N |
2249 | if (test_bit(AutoDetected, &rdev->flags)) |
2250 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2251 | #endif |
2252 | unlock_rdev(rdev); | |
86e6ffdd | 2253 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2254 | } |
2255 | ||
3cb03002 | 2256 | static void kick_rdev_from_array(struct md_rdev * rdev) |
1da177e4 LT |
2257 | { |
2258 | unbind_rdev_from_array(rdev); | |
2259 | export_rdev(rdev); | |
2260 | } | |
2261 | ||
fd01b88c | 2262 | static void export_array(struct mddev *mddev) |
1da177e4 | 2263 | { |
3cb03002 | 2264 | struct md_rdev *rdev, *tmp; |
1da177e4 | 2265 | |
dafb20fa | 2266 | rdev_for_each_safe(rdev, tmp, mddev) { |
1da177e4 LT |
2267 | if (!rdev->mddev) { |
2268 | MD_BUG(); | |
2269 | continue; | |
2270 | } | |
2271 | kick_rdev_from_array(rdev); | |
2272 | } | |
2273 | if (!list_empty(&mddev->disks)) | |
2274 | MD_BUG(); | |
2275 | mddev->raid_disks = 0; | |
2276 | mddev->major_version = 0; | |
2277 | } | |
2278 | ||
2279 | static void print_desc(mdp_disk_t *desc) | |
2280 | { | |
2281 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2282 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2283 | } | |
2284 | ||
cd2ac932 | 2285 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2286 | { |
2287 | int i; | |
2288 | ||
2289 | printk(KERN_INFO | |
2290 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2291 | sb->major_version, sb->minor_version, sb->patch_version, | |
2292 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2293 | sb->ctime); | |
2294 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2295 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2296 | sb->md_minor, sb->layout, sb->chunk_size); | |
2297 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2298 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2299 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2300 | sb->failed_disks, sb->spare_disks, | |
2301 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2302 | ||
2303 | printk(KERN_INFO); | |
2304 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2305 | mdp_disk_t *desc; | |
2306 | ||
2307 | desc = sb->disks + i; | |
2308 | if (desc->number || desc->major || desc->minor || | |
2309 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2310 | printk(" D %2d: ", i); | |
2311 | print_desc(desc); | |
2312 | } | |
2313 | } | |
2314 | printk(KERN_INFO "md: THIS: "); | |
2315 | print_desc(&sb->this_disk); | |
cd2ac932 | 2316 | } |
1da177e4 | 2317 | |
cd2ac932 CR |
2318 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2319 | { | |
2320 | __u8 *uuid; | |
2321 | ||
2322 | uuid = sb->set_uuid; | |
ad361c98 | 2323 | printk(KERN_INFO |
7b75c2f8 | 2324 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2325 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2326 | le32_to_cpu(sb->major_version), |
2327 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2328 | uuid, |
cd2ac932 CR |
2329 | sb->set_name, |
2330 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2331 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2332 | ||
2333 | uuid = sb->device_uuid; | |
ad361c98 JP |
2334 | printk(KERN_INFO |
2335 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2336 | " RO:%llu\n" |
7b75c2f8 | 2337 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2338 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2339 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2340 | le32_to_cpu(sb->level), |
2341 | (unsigned long long)le64_to_cpu(sb->size), | |
2342 | le32_to_cpu(sb->raid_disks), | |
2343 | le32_to_cpu(sb->layout), | |
2344 | le32_to_cpu(sb->chunksize), | |
2345 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2346 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2347 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2348 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2349 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2350 | uuid, |
cd2ac932 CR |
2351 | sb->devflags, |
2352 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2353 | (unsigned long long)le64_to_cpu(sb->events), | |
2354 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2355 | le32_to_cpu(sb->sb_csum), | |
2356 | le32_to_cpu(sb->max_dev) | |
2357 | ); | |
1da177e4 LT |
2358 | } |
2359 | ||
3cb03002 | 2360 | static void print_rdev(struct md_rdev *rdev, int major_version) |
1da177e4 LT |
2361 | { |
2362 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2363 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2364 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2365 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2366 | rdev->desc_nr); | |
1da177e4 | 2367 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2368 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2369 | switch (major_version) { | |
2370 | case 0: | |
65a06f06 | 2371 | print_sb_90(page_address(rdev->sb_page)); |
cd2ac932 CR |
2372 | break; |
2373 | case 1: | |
65a06f06 | 2374 | print_sb_1(page_address(rdev->sb_page)); |
cd2ac932 CR |
2375 | break; |
2376 | } | |
1da177e4 LT |
2377 | } else |
2378 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2379 | } | |
2380 | ||
5e56341d | 2381 | static void md_print_devices(void) |
1da177e4 | 2382 | { |
159ec1fc | 2383 | struct list_head *tmp; |
3cb03002 | 2384 | struct md_rdev *rdev; |
fd01b88c | 2385 | struct mddev *mddev; |
1da177e4 LT |
2386 | char b[BDEVNAME_SIZE]; |
2387 | ||
2388 | printk("\n"); | |
2389 | printk("md: **********************************\n"); | |
2390 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2391 | printk("md: **********************************\n"); | |
29ac4aa3 | 2392 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2393 | |
32a7627c N |
2394 | if (mddev->bitmap) |
2395 | bitmap_print_sb(mddev->bitmap); | |
2396 | else | |
2397 | printk("%s: ", mdname(mddev)); | |
dafb20fa | 2398 | rdev_for_each(rdev, mddev) |
1da177e4 LT |
2399 | printk("<%s>", bdevname(rdev->bdev,b)); |
2400 | printk("\n"); | |
2401 | ||
dafb20fa | 2402 | rdev_for_each(rdev, mddev) |
cd2ac932 | 2403 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2404 | } |
2405 | printk("md: **********************************\n"); | |
2406 | printk("\n"); | |
2407 | } | |
2408 | ||
2409 | ||
fd01b88c | 2410 | static void sync_sbs(struct mddev * mddev, int nospares) |
1da177e4 | 2411 | { |
42543769 N |
2412 | /* Update each superblock (in-memory image), but |
2413 | * if we are allowed to, skip spares which already | |
2414 | * have the right event counter, or have one earlier | |
2415 | * (which would mean they aren't being marked as dirty | |
2416 | * with the rest of the array) | |
2417 | */ | |
3cb03002 | 2418 | struct md_rdev *rdev; |
dafb20fa | 2419 | rdev_for_each(rdev, mddev) { |
42543769 N |
2420 | if (rdev->sb_events == mddev->events || |
2421 | (nospares && | |
2422 | rdev->raid_disk < 0 && | |
42543769 N |
2423 | rdev->sb_events+1 == mddev->events)) { |
2424 | /* Don't update this superblock */ | |
2425 | rdev->sb_loaded = 2; | |
2426 | } else { | |
076f968b | 2427 | sync_super(mddev, rdev); |
42543769 N |
2428 | rdev->sb_loaded = 1; |
2429 | } | |
1da177e4 LT |
2430 | } |
2431 | } | |
2432 | ||
fd01b88c | 2433 | static void md_update_sb(struct mddev * mddev, int force_change) |
1da177e4 | 2434 | { |
3cb03002 | 2435 | struct md_rdev *rdev; |
06d91a5f | 2436 | int sync_req; |
42543769 | 2437 | int nospares = 0; |
2699b672 | 2438 | int any_badblocks_changed = 0; |
1da177e4 | 2439 | |
1da177e4 | 2440 | repeat: |
3a3a5ddb | 2441 | /* First make sure individual recovery_offsets are correct */ |
dafb20fa | 2442 | rdev_for_each(rdev, mddev) { |
3a3a5ddb N |
2443 | if (rdev->raid_disk >= 0 && |
2444 | mddev->delta_disks >= 0 && | |
2445 | !test_bit(In_sync, &rdev->flags) && | |
2446 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2447 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2448 | ||
2449 | } | |
bd52b746 | 2450 | if (!mddev->persistent) { |
070dc6dd | 2451 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2452 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2453 | if (!mddev->external) { |
d97a41dc | 2454 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
dafb20fa | 2455 | rdev_for_each(rdev, mddev) { |
de393cde | 2456 | if (rdev->badblocks.changed) { |
d0962936 | 2457 | rdev->badblocks.changed = 0; |
de393cde N |
2458 | md_ack_all_badblocks(&rdev->badblocks); |
2459 | md_error(mddev, rdev); | |
2460 | } | |
2461 | clear_bit(Blocked, &rdev->flags); | |
2462 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2463 | wake_up(&rdev->blocked_wait); | |
2464 | } | |
2465 | } | |
3a3a5ddb N |
2466 | wake_up(&mddev->sb_wait); |
2467 | return; | |
2468 | } | |
2469 | ||
a9701a30 | 2470 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2471 | |
3a3a5ddb N |
2472 | mddev->utime = get_seconds(); |
2473 | ||
850b2b42 N |
2474 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2475 | force_change = 1; | |
2476 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2477 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2478 | * though if events isn't the right even/odd, we will have to do | |
2479 | * spares after all | |
2480 | */ | |
2481 | nospares = 1; | |
2482 | if (force_change) | |
2483 | nospares = 0; | |
2484 | if (mddev->degraded) | |
84692195 N |
2485 | /* If the array is degraded, then skipping spares is both |
2486 | * dangerous and fairly pointless. | |
2487 | * Dangerous because a device that was removed from the array | |
2488 | * might have a event_count that still looks up-to-date, | |
2489 | * so it can be re-added without a resync. | |
2490 | * Pointless because if there are any spares to skip, | |
2491 | * then a recovery will happen and soon that array won't | |
2492 | * be degraded any more and the spare can go back to sleep then. | |
2493 | */ | |
850b2b42 | 2494 | nospares = 0; |
84692195 | 2495 | |
06d91a5f | 2496 | sync_req = mddev->in_sync; |
42543769 N |
2497 | |
2498 | /* If this is just a dirty<->clean transition, and the array is clean | |
2499 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2500 | if (nospares |
42543769 | 2501 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2502 | && mddev->can_decrease_events |
2503 | && mddev->events != 1) { | |
42543769 | 2504 | mddev->events--; |
a8707c08 N |
2505 | mddev->can_decrease_events = 0; |
2506 | } else { | |
42543769 N |
2507 | /* otherwise we have to go forward and ... */ |
2508 | mddev->events ++; | |
a8707c08 | 2509 | mddev->can_decrease_events = nospares; |
42543769 | 2510 | } |
1da177e4 LT |
2511 | |
2512 | if (!mddev->events) { | |
2513 | /* | |
2514 | * oops, this 64-bit counter should never wrap. | |
2515 | * Either we are in around ~1 trillion A.C., assuming | |
2516 | * 1 reboot per second, or we have a bug: | |
2517 | */ | |
2518 | MD_BUG(); | |
2519 | mddev->events --; | |
2520 | } | |
2699b672 | 2521 | |
dafb20fa | 2522 | rdev_for_each(rdev, mddev) { |
2699b672 N |
2523 | if (rdev->badblocks.changed) |
2524 | any_badblocks_changed++; | |
de393cde N |
2525 | if (test_bit(Faulty, &rdev->flags)) |
2526 | set_bit(FaultRecorded, &rdev->flags); | |
2527 | } | |
2699b672 | 2528 | |
e691063a | 2529 | sync_sbs(mddev, nospares); |
a9701a30 | 2530 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 | 2531 | |
36a4e1fe N |
2532 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2533 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2534 | |
4ad13663 | 2535 | bitmap_update_sb(mddev->bitmap); |
dafb20fa | 2536 | rdev_for_each(rdev, mddev) { |
1da177e4 | 2537 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2538 | |
42543769 N |
2539 | if (rdev->sb_loaded != 1) |
2540 | continue; /* no noise on spare devices */ | |
1da177e4 | 2541 | |
d70ed2e4 AW |
2542 | if (!test_bit(Faulty, &rdev->flags) && |
2543 | rdev->saved_raid_disk == -1) { | |
7bfa19f2 | 2544 | md_super_write(mddev,rdev, |
0f420358 | 2545 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2546 | rdev->sb_page); |
36a4e1fe N |
2547 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2548 | bdevname(rdev->bdev, b), | |
2549 | (unsigned long long)rdev->sb_start); | |
42543769 | 2550 | rdev->sb_events = mddev->events; |
2699b672 N |
2551 | if (rdev->badblocks.size) { |
2552 | md_super_write(mddev, rdev, | |
2553 | rdev->badblocks.sector, | |
2554 | rdev->badblocks.size << 9, | |
2555 | rdev->bb_page); | |
2556 | rdev->badblocks.size = 0; | |
2557 | } | |
7bfa19f2 | 2558 | |
d70ed2e4 | 2559 | } else if (test_bit(Faulty, &rdev->flags)) |
36a4e1fe N |
2560 | pr_debug("md: %s (skipping faulty)\n", |
2561 | bdevname(rdev->bdev, b)); | |
d70ed2e4 AW |
2562 | else |
2563 | pr_debug("(skipping incremental s/r "); | |
2564 | ||
7bfa19f2 | 2565 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2566 | /* only need to write one superblock... */ |
2567 | break; | |
2568 | } | |
a9701a30 | 2569 | md_super_wait(mddev); |
850b2b42 | 2570 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2571 | |
a9701a30 | 2572 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2573 | if (mddev->in_sync != sync_req || |
2574 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2575 | /* have to write it out again */ |
a9701a30 | 2576 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2577 | goto repeat; |
2578 | } | |
850b2b42 | 2579 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2580 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2581 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2582 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2583 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2584 | |
dafb20fa | 2585 | rdev_for_each(rdev, mddev) { |
de393cde N |
2586 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) |
2587 | clear_bit(Blocked, &rdev->flags); | |
2588 | ||
2589 | if (any_badblocks_changed) | |
2699b672 | 2590 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2591 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2592 | wake_up(&rdev->blocked_wait); | |
2593 | } | |
1da177e4 LT |
2594 | } |
2595 | ||
7f6ce769 | 2596 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2597 | * We want to accept with case. For this we use cmd_match. |
2598 | */ | |
2599 | static int cmd_match(const char *cmd, const char *str) | |
2600 | { | |
2601 | /* See if cmd, written into a sysfs file, matches | |
2602 | * str. They must either be the same, or cmd can | |
2603 | * have a trailing newline | |
2604 | */ | |
2605 | while (*cmd && *str && *cmd == *str) { | |
2606 | cmd++; | |
2607 | str++; | |
2608 | } | |
2609 | if (*cmd == '\n') | |
2610 | cmd++; | |
2611 | if (*str || *cmd) | |
2612 | return 0; | |
2613 | return 1; | |
2614 | } | |
2615 | ||
86e6ffdd N |
2616 | struct rdev_sysfs_entry { |
2617 | struct attribute attr; | |
3cb03002 N |
2618 | ssize_t (*show)(struct md_rdev *, char *); |
2619 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2620 | }; |
2621 | ||
2622 | static ssize_t | |
3cb03002 | 2623 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2624 | { |
2625 | char *sep = ""; | |
20a49ff6 | 2626 | size_t len = 0; |
86e6ffdd | 2627 | |
de393cde N |
2628 | if (test_bit(Faulty, &rdev->flags) || |
2629 | rdev->badblocks.unacked_exist) { | |
86e6ffdd N |
2630 | len+= sprintf(page+len, "%sfaulty",sep); |
2631 | sep = ","; | |
2632 | } | |
b2d444d7 | 2633 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2634 | len += sprintf(page+len, "%sin_sync",sep); |
2635 | sep = ","; | |
2636 | } | |
f655675b N |
2637 | if (test_bit(WriteMostly, &rdev->flags)) { |
2638 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2639 | sep = ","; | |
2640 | } | |
de393cde | 2641 | if (test_bit(Blocked, &rdev->flags) || |
52c64152 N |
2642 | (rdev->badblocks.unacked_exist |
2643 | && !test_bit(Faulty, &rdev->flags))) { | |
6bfe0b49 DW |
2644 | len += sprintf(page+len, "%sblocked", sep); |
2645 | sep = ","; | |
2646 | } | |
b2d444d7 N |
2647 | if (!test_bit(Faulty, &rdev->flags) && |
2648 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2649 | len += sprintf(page+len, "%sspare", sep); |
2650 | sep = ","; | |
2651 | } | |
d7a9d443 N |
2652 | if (test_bit(WriteErrorSeen, &rdev->flags)) { |
2653 | len += sprintf(page+len, "%swrite_error", sep); | |
2654 | sep = ","; | |
2655 | } | |
2d78f8c4 N |
2656 | if (test_bit(WantReplacement, &rdev->flags)) { |
2657 | len += sprintf(page+len, "%swant_replacement", sep); | |
2658 | sep = ","; | |
2659 | } | |
2660 | if (test_bit(Replacement, &rdev->flags)) { | |
2661 | len += sprintf(page+len, "%sreplacement", sep); | |
2662 | sep = ","; | |
2663 | } | |
2664 | ||
86e6ffdd N |
2665 | return len+sprintf(page+len, "\n"); |
2666 | } | |
2667 | ||
45dc2de1 | 2668 | static ssize_t |
3cb03002 | 2669 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2670 | { |
2671 | /* can write | |
de393cde | 2672 | * faulty - simulates an error |
45dc2de1 | 2673 | * remove - disconnects the device |
f655675b N |
2674 | * writemostly - sets write_mostly |
2675 | * -writemostly - clears write_mostly | |
de393cde N |
2676 | * blocked - sets the Blocked flags |
2677 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2678 | * insync - sets Insync providing device isn't active |
d7a9d443 N |
2679 | * write_error - sets WriteErrorSeen |
2680 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2681 | */ |
2682 | int err = -EINVAL; | |
2683 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2684 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2685 | if (test_bit(Faulty, &rdev->flags)) |
2686 | err = 0; | |
2687 | else | |
2688 | err = -EBUSY; | |
45dc2de1 N |
2689 | } else if (cmd_match(buf, "remove")) { |
2690 | if (rdev->raid_disk >= 0) | |
2691 | err = -EBUSY; | |
2692 | else { | |
fd01b88c | 2693 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2694 | kick_rdev_from_array(rdev); |
3f9d7b0d N |
2695 | if (mddev->pers) |
2696 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2697 | md_new_event(mddev); |
2698 | err = 0; | |
2699 | } | |
f655675b N |
2700 | } else if (cmd_match(buf, "writemostly")) { |
2701 | set_bit(WriteMostly, &rdev->flags); | |
2702 | err = 0; | |
2703 | } else if (cmd_match(buf, "-writemostly")) { | |
2704 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2705 | err = 0; |
2706 | } else if (cmd_match(buf, "blocked")) { | |
2707 | set_bit(Blocked, &rdev->flags); | |
2708 | err = 0; | |
2709 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2710 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2711 | rdev->badblocks.unacked_exist) { |
de393cde N |
2712 | /* metadata handler doesn't understand badblocks, |
2713 | * so we need to fail the device | |
2714 | */ | |
2715 | md_error(rdev->mddev, rdev); | |
2716 | } | |
6bfe0b49 | 2717 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2718 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2719 | wake_up(&rdev->blocked_wait); |
2720 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2721 | md_wakeup_thread(rdev->mddev->thread); | |
2722 | ||
6d56e278 N |
2723 | err = 0; |
2724 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2725 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2726 | err = 0; |
d7a9d443 N |
2727 | } else if (cmd_match(buf, "write_error")) { |
2728 | set_bit(WriteErrorSeen, &rdev->flags); | |
2729 | err = 0; | |
2730 | } else if (cmd_match(buf, "-write_error")) { | |
2731 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2732 | err = 0; | |
2d78f8c4 N |
2733 | } else if (cmd_match(buf, "want_replacement")) { |
2734 | /* Any non-spare device that is not a replacement can | |
2735 | * become want_replacement at any time, but we then need to | |
2736 | * check if recovery is needed. | |
2737 | */ | |
2738 | if (rdev->raid_disk >= 0 && | |
2739 | !test_bit(Replacement, &rdev->flags)) | |
2740 | set_bit(WantReplacement, &rdev->flags); | |
2741 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2742 | md_wakeup_thread(rdev->mddev->thread); | |
2743 | err = 0; | |
2744 | } else if (cmd_match(buf, "-want_replacement")) { | |
2745 | /* Clearing 'want_replacement' is always allowed. | |
2746 | * Once replacements starts it is too late though. | |
2747 | */ | |
2748 | err = 0; | |
2749 | clear_bit(WantReplacement, &rdev->flags); | |
2750 | } else if (cmd_match(buf, "replacement")) { | |
2751 | /* Can only set a device as a replacement when array has not | |
2752 | * yet been started. Once running, replacement is automatic | |
2753 | * from spares, or by assigning 'slot'. | |
2754 | */ | |
2755 | if (rdev->mddev->pers) | |
2756 | err = -EBUSY; | |
2757 | else { | |
2758 | set_bit(Replacement, &rdev->flags); | |
2759 | err = 0; | |
2760 | } | |
2761 | } else if (cmd_match(buf, "-replacement")) { | |
2762 | /* Similarly, can only clear Replacement before start */ | |
2763 | if (rdev->mddev->pers) | |
2764 | err = -EBUSY; | |
2765 | else { | |
2766 | clear_bit(Replacement, &rdev->flags); | |
2767 | err = 0; | |
2768 | } | |
45dc2de1 | 2769 | } |
00bcb4ac N |
2770 | if (!err) |
2771 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2772 | return err ? err : len; |
2773 | } | |
80ca3a44 N |
2774 | static struct rdev_sysfs_entry rdev_state = |
2775 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2776 | |
4dbcdc75 | 2777 | static ssize_t |
3cb03002 | 2778 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2779 | { |
2780 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2781 | } | |
2782 | ||
2783 | static ssize_t | |
3cb03002 | 2784 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 N |
2785 | { |
2786 | char *e; | |
2787 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2788 | if (*buf && (*e == 0 || *e == '\n')) { | |
2789 | atomic_set(&rdev->corrected_errors, n); | |
2790 | return len; | |
2791 | } | |
2792 | return -EINVAL; | |
2793 | } | |
2794 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2795 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2796 | |
014236d2 | 2797 | static ssize_t |
3cb03002 | 2798 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2799 | { |
2800 | if (rdev->raid_disk < 0) | |
2801 | return sprintf(page, "none\n"); | |
2802 | else | |
2803 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2804 | } | |
2805 | ||
2806 | static ssize_t | |
3cb03002 | 2807 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 N |
2808 | { |
2809 | char *e; | |
c303da6d | 2810 | int err; |
014236d2 N |
2811 | int slot = simple_strtoul(buf, &e, 10); |
2812 | if (strncmp(buf, "none", 4)==0) | |
2813 | slot = -1; | |
2814 | else if (e==buf || (*e && *e!= '\n')) | |
2815 | return -EINVAL; | |
6c2fce2e | 2816 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2817 | /* Setting 'slot' on an active array requires also |
2818 | * updating the 'rd%d' link, and communicating | |
2819 | * with the personality with ->hot_*_disk. | |
2820 | * For now we only support removing | |
2821 | * failed/spare devices. This normally happens automatically, | |
2822 | * but not when the metadata is externally managed. | |
2823 | */ | |
c303da6d N |
2824 | if (rdev->raid_disk == -1) |
2825 | return -EEXIST; | |
2826 | /* personality does all needed checks */ | |
01393f3d | 2827 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d N |
2828 | return -EINVAL; |
2829 | err = rdev->mddev->pers-> | |
b8321b68 | 2830 | hot_remove_disk(rdev->mddev, rdev); |
c303da6d N |
2831 | if (err) |
2832 | return err; | |
36fad858 | 2833 | sysfs_unlink_rdev(rdev->mddev, rdev); |
b7103107 | 2834 | rdev->raid_disk = -1; |
c303da6d N |
2835 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2836 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2837 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2838 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2839 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2840 | */ |
2841 | ||
2842 | if (rdev->raid_disk != -1) | |
2843 | return -EBUSY; | |
2844 | ||
c6751b2b N |
2845 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2846 | return -EBUSY; | |
2847 | ||
6c2fce2e NB |
2848 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2849 | return -EINVAL; | |
2850 | ||
ba1b41b6 N |
2851 | if (slot >= rdev->mddev->raid_disks && |
2852 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2853 | return -ENOSPC; | |
2854 | ||
6c2fce2e NB |
2855 | rdev->raid_disk = slot; |
2856 | if (test_bit(In_sync, &rdev->flags)) | |
2857 | rdev->saved_raid_disk = slot; | |
2858 | else | |
2859 | rdev->saved_raid_disk = -1; | |
d30519fc | 2860 | clear_bit(In_sync, &rdev->flags); |
6c2fce2e NB |
2861 | err = rdev->mddev->pers-> |
2862 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2863 | if (err) { |
6c2fce2e | 2864 | rdev->raid_disk = -1; |
6c2fce2e | 2865 | return err; |
52664732 | 2866 | } else |
00bcb4ac | 2867 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2868 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2869 | /* failure here is OK */; |
6c2fce2e | 2870 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2871 | } else { |
ba1b41b6 N |
2872 | if (slot >= rdev->mddev->raid_disks && |
2873 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2874 | return -ENOSPC; |
2875 | rdev->raid_disk = slot; | |
2876 | /* assume it is working */ | |
c5d79adb N |
2877 | clear_bit(Faulty, &rdev->flags); |
2878 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2879 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2880 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2881 | } |
014236d2 N |
2882 | return len; |
2883 | } | |
2884 | ||
2885 | ||
2886 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2887 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2888 | |
93c8cad0 | 2889 | static ssize_t |
3cb03002 | 2890 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2891 | { |
6961ece4 | 2892 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2893 | } |
2894 | ||
2895 | static ssize_t | |
3cb03002 | 2896 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 | 2897 | { |
c6563a8c N |
2898 | unsigned long long offset; |
2899 | if (strict_strtoull(buf, 10, &offset) < 0) | |
93c8cad0 | 2900 | return -EINVAL; |
8ed0a521 | 2901 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2902 | return -EBUSY; |
dd8ac336 | 2903 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2904 | /* Must set offset before size, so overlap checks |
2905 | * can be sane */ | |
2906 | return -EBUSY; | |
93c8cad0 N |
2907 | rdev->data_offset = offset; |
2908 | return len; | |
2909 | } | |
2910 | ||
2911 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2912 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2913 | |
c6563a8c N |
2914 | static ssize_t new_offset_show(struct md_rdev *rdev, char *page) |
2915 | { | |
2916 | return sprintf(page, "%llu\n", | |
2917 | (unsigned long long)rdev->new_data_offset); | |
2918 | } | |
2919 | ||
2920 | static ssize_t new_offset_store(struct md_rdev *rdev, | |
2921 | const char *buf, size_t len) | |
2922 | { | |
2923 | unsigned long long new_offset; | |
2924 | struct mddev *mddev = rdev->mddev; | |
2925 | ||
2926 | if (strict_strtoull(buf, 10, &new_offset) < 0) | |
2927 | return -EINVAL; | |
2928 | ||
2929 | if (mddev->sync_thread) | |
2930 | return -EBUSY; | |
2931 | if (new_offset == rdev->data_offset) | |
2932 | /* reset is always permitted */ | |
2933 | ; | |
2934 | else if (new_offset > rdev->data_offset) { | |
2935 | /* must not push array size beyond rdev_sectors */ | |
2936 | if (new_offset - rdev->data_offset | |
2937 | + mddev->dev_sectors > rdev->sectors) | |
2938 | return -E2BIG; | |
2939 | } | |
2940 | /* Metadata worries about other space details. */ | |
2941 | ||
2942 | /* decreasing the offset is inconsistent with a backwards | |
2943 | * reshape. | |
2944 | */ | |
2945 | if (new_offset < rdev->data_offset && | |
2946 | mddev->reshape_backwards) | |
2947 | return -EINVAL; | |
2948 | /* Increasing offset is inconsistent with forwards | |
2949 | * reshape. reshape_direction should be set to | |
2950 | * 'backwards' first. | |
2951 | */ | |
2952 | if (new_offset > rdev->data_offset && | |
2953 | !mddev->reshape_backwards) | |
2954 | return -EINVAL; | |
2955 | ||
2956 | if (mddev->pers && mddev->persistent && | |
2957 | !super_types[mddev->major_version] | |
2958 | .allow_new_offset(rdev, new_offset)) | |
2959 | return -E2BIG; | |
2960 | rdev->new_data_offset = new_offset; | |
2961 | if (new_offset > rdev->data_offset) | |
2962 | mddev->reshape_backwards = 1; | |
2963 | else if (new_offset < rdev->data_offset) | |
2964 | mddev->reshape_backwards = 0; | |
2965 | ||
2966 | return len; | |
2967 | } | |
2968 | static struct rdev_sysfs_entry rdev_new_offset = | |
2969 | __ATTR(new_offset, S_IRUGO|S_IWUSR, new_offset_show, new_offset_store); | |
2970 | ||
83303b61 | 2971 | static ssize_t |
3cb03002 | 2972 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2973 | { |
dd8ac336 | 2974 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2975 | } |
2976 | ||
c5d79adb N |
2977 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2978 | { | |
2979 | /* check if two start/length pairs overlap */ | |
2980 | if (s1+l1 <= s2) | |
2981 | return 0; | |
2982 | if (s2+l2 <= s1) | |
2983 | return 0; | |
2984 | return 1; | |
2985 | } | |
2986 | ||
b522adcd DW |
2987 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2988 | { | |
2989 | unsigned long long blocks; | |
2990 | sector_t new; | |
2991 | ||
2992 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2993 | return -EINVAL; | |
2994 | ||
2995 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2996 | return -EINVAL; /* sector conversion overflow */ | |
2997 | ||
2998 | new = blocks * 2; | |
2999 | if (new != blocks * 2) | |
3000 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
3001 | ||
3002 | *sectors = new; | |
3003 | return 0; | |
3004 | } | |
3005 | ||
83303b61 | 3006 | static ssize_t |
3cb03002 | 3007 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 3008 | { |
fd01b88c | 3009 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 3010 | sector_t oldsectors = rdev->sectors; |
b522adcd | 3011 | sector_t sectors; |
27c529bb | 3012 | |
b522adcd | 3013 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 3014 | return -EINVAL; |
c6563a8c N |
3015 | if (rdev->data_offset != rdev->new_data_offset) |
3016 | return -EINVAL; /* too confusing */ | |
0cd17fec | 3017 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 3018 | if (my_mddev->persistent) { |
dd8ac336 AN |
3019 | sectors = super_types[my_mddev->major_version]. |
3020 | rdev_size_change(rdev, sectors); | |
3021 | if (!sectors) | |
0cd17fec | 3022 | return -EBUSY; |
dd8ac336 | 3023 | } else if (!sectors) |
77304d2a | 3024 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 3025 | rdev->data_offset; |
0cd17fec | 3026 | } |
dd8ac336 | 3027 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 3028 | return -EINVAL; /* component must fit device */ |
0cd17fec | 3029 | |
dd8ac336 AN |
3030 | rdev->sectors = sectors; |
3031 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
3032 | /* need to check that all other rdevs with the same ->bdev |
3033 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 3034 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
3035 | * we have to change it back, we will have the lock again. |
3036 | */ | |
fd01b88c | 3037 | struct mddev *mddev; |
c5d79adb | 3038 | int overlap = 0; |
159ec1fc | 3039 | struct list_head *tmp; |
c5d79adb | 3040 | |
27c529bb | 3041 | mddev_unlock(my_mddev); |
29ac4aa3 | 3042 | for_each_mddev(mddev, tmp) { |
3cb03002 | 3043 | struct md_rdev *rdev2; |
c5d79adb N |
3044 | |
3045 | mddev_lock(mddev); | |
dafb20fa | 3046 | rdev_for_each(rdev2, mddev) |
f21e9ff7 N |
3047 | if (rdev->bdev == rdev2->bdev && |
3048 | rdev != rdev2 && | |
3049 | overlaps(rdev->data_offset, rdev->sectors, | |
3050 | rdev2->data_offset, | |
3051 | rdev2->sectors)) { | |
c5d79adb N |
3052 | overlap = 1; |
3053 | break; | |
3054 | } | |
3055 | mddev_unlock(mddev); | |
3056 | if (overlap) { | |
3057 | mddev_put(mddev); | |
3058 | break; | |
3059 | } | |
3060 | } | |
27c529bb | 3061 | mddev_lock(my_mddev); |
c5d79adb N |
3062 | if (overlap) { |
3063 | /* Someone else could have slipped in a size | |
3064 | * change here, but doing so is just silly. | |
dd8ac336 | 3065 | * We put oldsectors back because we *know* it is |
c5d79adb N |
3066 | * safe, and trust userspace not to race with |
3067 | * itself | |
3068 | */ | |
dd8ac336 | 3069 | rdev->sectors = oldsectors; |
c5d79adb N |
3070 | return -EBUSY; |
3071 | } | |
3072 | } | |
83303b61 N |
3073 | return len; |
3074 | } | |
3075 | ||
3076 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 3077 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 3078 | |
06e3c817 | 3079 | |
3cb03002 | 3080 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
3081 | { |
3082 | unsigned long long recovery_start = rdev->recovery_offset; | |
3083 | ||
3084 | if (test_bit(In_sync, &rdev->flags) || | |
3085 | recovery_start == MaxSector) | |
3086 | return sprintf(page, "none\n"); | |
3087 | ||
3088 | return sprintf(page, "%llu\n", recovery_start); | |
3089 | } | |
3090 | ||
3cb03002 | 3091 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
3092 | { |
3093 | unsigned long long recovery_start; | |
3094 | ||
3095 | if (cmd_match(buf, "none")) | |
3096 | recovery_start = MaxSector; | |
3097 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
3098 | return -EINVAL; | |
3099 | ||
3100 | if (rdev->mddev->pers && | |
3101 | rdev->raid_disk >= 0) | |
3102 | return -EBUSY; | |
3103 | ||
3104 | rdev->recovery_offset = recovery_start; | |
3105 | if (recovery_start == MaxSector) | |
3106 | set_bit(In_sync, &rdev->flags); | |
3107 | else | |
3108 | clear_bit(In_sync, &rdev->flags); | |
3109 | return len; | |
3110 | } | |
3111 | ||
3112 | static struct rdev_sysfs_entry rdev_recovery_start = | |
3113 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
3114 | ||
16c791a5 N |
3115 | |
3116 | static ssize_t | |
3117 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
3118 | static ssize_t | |
3119 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
3120 | ||
3cb03002 | 3121 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3122 | { |
3123 | return badblocks_show(&rdev->badblocks, page, 0); | |
3124 | } | |
3cb03002 | 3125 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 3126 | { |
de393cde N |
3127 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
3128 | /* Maybe that ack was all we needed */ | |
3129 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
3130 | wake_up(&rdev->blocked_wait); | |
3131 | return rv; | |
16c791a5 N |
3132 | } |
3133 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
3134 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
3135 | ||
3136 | ||
3cb03002 | 3137 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
3138 | { |
3139 | return badblocks_show(&rdev->badblocks, page, 1); | |
3140 | } | |
3cb03002 | 3141 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
3142 | { |
3143 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
3144 | } | |
3145 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
3146 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
3147 | ||
86e6ffdd N |
3148 | static struct attribute *rdev_default_attrs[] = { |
3149 | &rdev_state.attr, | |
4dbcdc75 | 3150 | &rdev_errors.attr, |
014236d2 | 3151 | &rdev_slot.attr, |
93c8cad0 | 3152 | &rdev_offset.attr, |
c6563a8c | 3153 | &rdev_new_offset.attr, |
83303b61 | 3154 | &rdev_size.attr, |
06e3c817 | 3155 | &rdev_recovery_start.attr, |
16c791a5 N |
3156 | &rdev_bad_blocks.attr, |
3157 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
3158 | NULL, |
3159 | }; | |
3160 | static ssize_t | |
3161 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3162 | { | |
3163 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3164 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
fd01b88c | 3165 | struct mddev *mddev = rdev->mddev; |
27c529bb | 3166 | ssize_t rv; |
86e6ffdd N |
3167 | |
3168 | if (!entry->show) | |
3169 | return -EIO; | |
27c529bb N |
3170 | |
3171 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
3172 | if (!rv) { | |
3173 | if (rdev->mddev == NULL) | |
3174 | rv = -EBUSY; | |
3175 | else | |
3176 | rv = entry->show(rdev, page); | |
3177 | mddev_unlock(mddev); | |
3178 | } | |
3179 | return rv; | |
86e6ffdd N |
3180 | } |
3181 | ||
3182 | static ssize_t | |
3183 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
3184 | const char *page, size_t length) | |
3185 | { | |
3186 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3187 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 3188 | ssize_t rv; |
fd01b88c | 3189 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
3190 | |
3191 | if (!entry->store) | |
3192 | return -EIO; | |
67463acb N |
3193 | if (!capable(CAP_SYS_ADMIN)) |
3194 | return -EACCES; | |
27c529bb | 3195 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 3196 | if (!rv) { |
27c529bb N |
3197 | if (rdev->mddev == NULL) |
3198 | rv = -EBUSY; | |
3199 | else | |
3200 | rv = entry->store(rdev, page, length); | |
6a51830e | 3201 | mddev_unlock(mddev); |
ca388059 N |
3202 | } |
3203 | return rv; | |
86e6ffdd N |
3204 | } |
3205 | ||
3206 | static void rdev_free(struct kobject *ko) | |
3207 | { | |
3cb03002 | 3208 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3209 | kfree(rdev); |
3210 | } | |
52cf25d0 | 3211 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3212 | .show = rdev_attr_show, |
3213 | .store = rdev_attr_store, | |
3214 | }; | |
3215 | static struct kobj_type rdev_ktype = { | |
3216 | .release = rdev_free, | |
3217 | .sysfs_ops = &rdev_sysfs_ops, | |
3218 | .default_attrs = rdev_default_attrs, | |
3219 | }; | |
3220 | ||
3cb03002 | 3221 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3222 | { |
3223 | rdev->desc_nr = -1; | |
3224 | rdev->saved_raid_disk = -1; | |
3225 | rdev->raid_disk = -1; | |
3226 | rdev->flags = 0; | |
3227 | rdev->data_offset = 0; | |
c6563a8c | 3228 | rdev->new_data_offset = 0; |
e8bb9a83 N |
3229 | rdev->sb_events = 0; |
3230 | rdev->last_read_error.tv_sec = 0; | |
3231 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3232 | rdev->sb_loaded = 0; |
3233 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3234 | atomic_set(&rdev->nr_pending, 0); |
3235 | atomic_set(&rdev->read_errors, 0); | |
3236 | atomic_set(&rdev->corrected_errors, 0); | |
3237 | ||
3238 | INIT_LIST_HEAD(&rdev->same_set); | |
3239 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3240 | |
3241 | /* Add space to store bad block list. | |
3242 | * This reserves the space even on arrays where it cannot | |
3243 | * be used - I wonder if that matters | |
3244 | */ | |
3245 | rdev->badblocks.count = 0; | |
3246 | rdev->badblocks.shift = 0; | |
3247 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3248 | seqlock_init(&rdev->badblocks.lock); | |
3249 | if (rdev->badblocks.page == NULL) | |
3250 | return -ENOMEM; | |
3251 | ||
3252 | return 0; | |
e8bb9a83 N |
3253 | } |
3254 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3255 | /* |
3256 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3257 | * | |
3258 | * mark the device faulty if: | |
3259 | * | |
3260 | * - the device is nonexistent (zero size) | |
3261 | * - the device has no valid superblock | |
3262 | * | |
3263 | * a faulty rdev _never_ has rdev->sb set. | |
3264 | */ | |
3cb03002 | 3265 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3266 | { |
3267 | char b[BDEVNAME_SIZE]; | |
3268 | int err; | |
3cb03002 | 3269 | struct md_rdev *rdev; |
1da177e4 LT |
3270 | sector_t size; |
3271 | ||
9ffae0cf | 3272 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3273 | if (!rdev) { |
3274 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3275 | return ERR_PTR(-ENOMEM); | |
3276 | } | |
1da177e4 | 3277 | |
2230dfe4 N |
3278 | err = md_rdev_init(rdev); |
3279 | if (err) | |
3280 | goto abort_free; | |
3281 | err = alloc_disk_sb(rdev); | |
3282 | if (err) | |
1da177e4 LT |
3283 | goto abort_free; |
3284 | ||
c5d79adb | 3285 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3286 | if (err) |
3287 | goto abort_free; | |
3288 | ||
f9cb074b | 3289 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3290 | |
77304d2a | 3291 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 LT |
3292 | if (!size) { |
3293 | printk(KERN_WARNING | |
3294 | "md: %s has zero or unknown size, marking faulty!\n", | |
3295 | bdevname(rdev->bdev,b)); | |
3296 | err = -EINVAL; | |
3297 | goto abort_free; | |
3298 | } | |
3299 | ||
3300 | if (super_format >= 0) { | |
3301 | err = super_types[super_format]. | |
3302 | load_super(rdev, NULL, super_minor); | |
3303 | if (err == -EINVAL) { | |
df968c4e N |
3304 | printk(KERN_WARNING |
3305 | "md: %s does not have a valid v%d.%d " | |
3306 | "superblock, not importing!\n", | |
3307 | bdevname(rdev->bdev,b), | |
3308 | super_format, super_minor); | |
1da177e4 LT |
3309 | goto abort_free; |
3310 | } | |
3311 | if (err < 0) { | |
3312 | printk(KERN_WARNING | |
3313 | "md: could not read %s's sb, not importing!\n", | |
3314 | bdevname(rdev->bdev,b)); | |
3315 | goto abort_free; | |
3316 | } | |
3317 | } | |
9f2f3830 N |
3318 | if (super_format == -1) |
3319 | /* hot-add for 0.90, or non-persistent: so no badblocks */ | |
3320 | rdev->badblocks.shift = -1; | |
6bfe0b49 | 3321 | |
1da177e4 LT |
3322 | return rdev; |
3323 | ||
3324 | abort_free: | |
2699b672 N |
3325 | if (rdev->bdev) |
3326 | unlock_rdev(rdev); | |
545c8795 | 3327 | md_rdev_clear(rdev); |
2230dfe4 | 3328 | kfree(rdev->badblocks.page); |
1da177e4 LT |
3329 | kfree(rdev); |
3330 | return ERR_PTR(err); | |
3331 | } | |
3332 | ||
3333 | /* | |
3334 | * Check a full RAID array for plausibility | |
3335 | */ | |
3336 | ||
3337 | ||
fd01b88c | 3338 | static void analyze_sbs(struct mddev * mddev) |
1da177e4 LT |
3339 | { |
3340 | int i; | |
3cb03002 | 3341 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3342 | char b[BDEVNAME_SIZE]; |
3343 | ||
3344 | freshest = NULL; | |
dafb20fa | 3345 | rdev_for_each_safe(rdev, tmp, mddev) |
1da177e4 LT |
3346 | switch (super_types[mddev->major_version]. |
3347 | load_super(rdev, freshest, mddev->minor_version)) { | |
3348 | case 1: | |
3349 | freshest = rdev; | |
3350 | break; | |
3351 | case 0: | |
3352 | break; | |
3353 | default: | |
3354 | printk( KERN_ERR \ | |
3355 | "md: fatal superblock inconsistency in %s" | |
3356 | " -- removing from array\n", | |
3357 | bdevname(rdev->bdev,b)); | |
3358 | kick_rdev_from_array(rdev); | |
3359 | } | |
3360 | ||
3361 | ||
3362 | super_types[mddev->major_version]. | |
3363 | validate_super(mddev, freshest); | |
3364 | ||
3365 | i = 0; | |
dafb20fa | 3366 | rdev_for_each_safe(rdev, tmp, mddev) { |
233fca36 N |
3367 | if (mddev->max_disks && |
3368 | (rdev->desc_nr >= mddev->max_disks || | |
3369 | i > mddev->max_disks)) { | |
de01dfad N |
3370 | printk(KERN_WARNING |
3371 | "md: %s: %s: only %d devices permitted\n", | |
3372 | mdname(mddev), bdevname(rdev->bdev, b), | |
3373 | mddev->max_disks); | |
3374 | kick_rdev_from_array(rdev); | |
3375 | continue; | |
3376 | } | |
1da177e4 LT |
3377 | if (rdev != freshest) |
3378 | if (super_types[mddev->major_version]. | |
3379 | validate_super(mddev, rdev)) { | |
3380 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3381 | " from array!\n", | |
3382 | bdevname(rdev->bdev,b)); | |
3383 | kick_rdev_from_array(rdev); | |
3384 | continue; | |
3385 | } | |
3386 | if (mddev->level == LEVEL_MULTIPATH) { | |
3387 | rdev->desc_nr = i++; | |
3388 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3389 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3390 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3391 | rdev->raid_disk = -1; |
3392 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3393 | } |
3394 | } | |
1da177e4 LT |
3395 | } |
3396 | ||
72e02075 N |
3397 | /* Read a fixed-point number. |
3398 | * Numbers in sysfs attributes should be in "standard" units where | |
3399 | * possible, so time should be in seconds. | |
3400 | * However we internally use a a much smaller unit such as | |
3401 | * milliseconds or jiffies. | |
3402 | * This function takes a decimal number with a possible fractional | |
3403 | * component, and produces an integer which is the result of | |
3404 | * multiplying that number by 10^'scale'. | |
3405 | * all without any floating-point arithmetic. | |
3406 | */ | |
3407 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3408 | { | |
3409 | unsigned long result = 0; | |
3410 | long decimals = -1; | |
3411 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3412 | if (*cp == '.') | |
3413 | decimals = 0; | |
3414 | else if (decimals < scale) { | |
3415 | unsigned int value; | |
3416 | value = *cp - '0'; | |
3417 | result = result * 10 + value; | |
3418 | if (decimals >= 0) | |
3419 | decimals++; | |
3420 | } | |
3421 | cp++; | |
3422 | } | |
3423 | if (*cp == '\n') | |
3424 | cp++; | |
3425 | if (*cp) | |
3426 | return -EINVAL; | |
3427 | if (decimals < 0) | |
3428 | decimals = 0; | |
3429 | while (decimals < scale) { | |
3430 | result *= 10; | |
3431 | decimals ++; | |
3432 | } | |
3433 | *res = result; | |
3434 | return 0; | |
3435 | } | |
3436 | ||
3437 | ||
19052c0e N |
3438 | static void md_safemode_timeout(unsigned long data); |
3439 | ||
16f17b39 | 3440 | static ssize_t |
fd01b88c | 3441 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3442 | { |
3443 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3444 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3445 | } | |
3446 | static ssize_t | |
fd01b88c | 3447 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3448 | { |
16f17b39 | 3449 | unsigned long msec; |
97ce0a7f | 3450 | |
72e02075 | 3451 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3452 | return -EINVAL; |
16f17b39 N |
3453 | if (msec == 0) |
3454 | mddev->safemode_delay = 0; | |
3455 | else { | |
19052c0e | 3456 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
3457 | mddev->safemode_delay = (msec*HZ)/1000; |
3458 | if (mddev->safemode_delay == 0) | |
3459 | mddev->safemode_delay = 1; | |
19052c0e N |
3460 | if (mddev->safemode_delay < old_delay) |
3461 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
3462 | } |
3463 | return len; | |
3464 | } | |
3465 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3466 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3467 | |
eae1701f | 3468 | static ssize_t |
fd01b88c | 3469 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3470 | { |
84fc4b56 | 3471 | struct md_personality *p = mddev->pers; |
d9d166c2 | 3472 | if (p) |
eae1701f | 3473 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
3474 | else if (mddev->clevel[0]) |
3475 | return sprintf(page, "%s\n", mddev->clevel); | |
3476 | else if (mddev->level != LEVEL_NONE) | |
3477 | return sprintf(page, "%d\n", mddev->level); | |
3478 | else | |
3479 | return 0; | |
eae1701f N |
3480 | } |
3481 | ||
d9d166c2 | 3482 | static ssize_t |
fd01b88c | 3483 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3484 | { |
f2859af6 | 3485 | char clevel[16]; |
20a49ff6 | 3486 | ssize_t rv = len; |
84fc4b56 | 3487 | struct md_personality *pers; |
f2859af6 | 3488 | long level; |
245f46c2 | 3489 | void *priv; |
3cb03002 | 3490 | struct md_rdev *rdev; |
245f46c2 N |
3491 | |
3492 | if (mddev->pers == NULL) { | |
3493 | if (len == 0) | |
3494 | return 0; | |
3495 | if (len >= sizeof(mddev->clevel)) | |
3496 | return -ENOSPC; | |
3497 | strncpy(mddev->clevel, buf, len); | |
3498 | if (mddev->clevel[len-1] == '\n') | |
3499 | len--; | |
3500 | mddev->clevel[len] = 0; | |
3501 | mddev->level = LEVEL_NONE; | |
3502 | return rv; | |
3503 | } | |
3504 | ||
3505 | /* request to change the personality. Need to ensure: | |
3506 | * - array is not engaged in resync/recovery/reshape | |
3507 | * - old personality can be suspended | |
3508 | * - new personality will access other array. | |
3509 | */ | |
3510 | ||
bb4f1e9d N |
3511 | if (mddev->sync_thread || |
3512 | mddev->reshape_position != MaxSector || | |
3513 | mddev->sysfs_active) | |
d9d166c2 | 3514 | return -EBUSY; |
245f46c2 N |
3515 | |
3516 | if (!mddev->pers->quiesce) { | |
3517 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3518 | mdname(mddev), mddev->pers->name); | |
3519 | return -EINVAL; | |
3520 | } | |
3521 | ||
3522 | /* Now find the new personality */ | |
f2859af6 | 3523 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3524 | return -EINVAL; |
f2859af6 DW |
3525 | strncpy(clevel, buf, len); |
3526 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3527 | len--; |
f2859af6 DW |
3528 | clevel[len] = 0; |
3529 | if (strict_strtol(clevel, 10, &level)) | |
3530 | level = LEVEL_NONE; | |
245f46c2 | 3531 | |
f2859af6 DW |
3532 | if (request_module("md-%s", clevel) != 0) |
3533 | request_module("md-level-%s", clevel); | |
245f46c2 | 3534 | spin_lock(&pers_lock); |
f2859af6 | 3535 | pers = find_pers(level, clevel); |
245f46c2 N |
3536 | if (!pers || !try_module_get(pers->owner)) { |
3537 | spin_unlock(&pers_lock); | |
f2859af6 | 3538 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3539 | return -EINVAL; |
3540 | } | |
3541 | spin_unlock(&pers_lock); | |
3542 | ||
3543 | if (pers == mddev->pers) { | |
3544 | /* Nothing to do! */ | |
3545 | module_put(pers->owner); | |
3546 | return rv; | |
3547 | } | |
3548 | if (!pers->takeover) { | |
3549 | module_put(pers->owner); | |
3550 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3551 | mdname(mddev), clevel); |
245f46c2 N |
3552 | return -EINVAL; |
3553 | } | |
3554 | ||
dafb20fa | 3555 | rdev_for_each(rdev, mddev) |
e93f68a1 N |
3556 | rdev->new_raid_disk = rdev->raid_disk; |
3557 | ||
245f46c2 N |
3558 | /* ->takeover must set new_* and/or delta_disks |
3559 | * if it succeeds, and may set them when it fails. | |
3560 | */ | |
3561 | priv = pers->takeover(mddev); | |
3562 | if (IS_ERR(priv)) { | |
3563 | mddev->new_level = mddev->level; | |
3564 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3565 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3566 | mddev->raid_disks -= mddev->delta_disks; |
3567 | mddev->delta_disks = 0; | |
2c810cdd | 3568 | mddev->reshape_backwards = 0; |
245f46c2 N |
3569 | module_put(pers->owner); |
3570 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3571 | mdname(mddev), clevel); |
245f46c2 N |
3572 | return PTR_ERR(priv); |
3573 | } | |
3574 | ||
3575 | /* Looks like we have a winner */ | |
3576 | mddev_suspend(mddev); | |
3577 | mddev->pers->stop(mddev); | |
a64c876f N |
3578 | |
3579 | if (mddev->pers->sync_request == NULL && | |
3580 | pers->sync_request != NULL) { | |
3581 | /* need to add the md_redundancy_group */ | |
3582 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3583 | printk(KERN_WARNING | |
3584 | "md: cannot register extra attributes for %s\n", | |
3585 | mdname(mddev)); | |
19fdb9ee | 3586 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3587 | } |
3588 | if (mddev->pers->sync_request != NULL && | |
3589 | pers->sync_request == NULL) { | |
3590 | /* need to remove the md_redundancy_group */ | |
3591 | if (mddev->to_remove == NULL) | |
3592 | mddev->to_remove = &md_redundancy_group; | |
3593 | } | |
3594 | ||
54071b38 TM |
3595 | if (mddev->pers->sync_request == NULL && |
3596 | mddev->external) { | |
3597 | /* We are converting from a no-redundancy array | |
3598 | * to a redundancy array and metadata is managed | |
3599 | * externally so we need to be sure that writes | |
3600 | * won't block due to a need to transition | |
3601 | * clean->dirty | |
3602 | * until external management is started. | |
3603 | */ | |
3604 | mddev->in_sync = 0; | |
3605 | mddev->safemode_delay = 0; | |
3606 | mddev->safemode = 0; | |
3607 | } | |
3608 | ||
dafb20fa | 3609 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3610 | if (rdev->raid_disk < 0) |
3611 | continue; | |
bf2cb0da | 3612 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3613 | rdev->new_raid_disk = -1; |
3614 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3615 | continue; | |
36fad858 | 3616 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 | 3617 | } |
dafb20fa | 3618 | rdev_for_each(rdev, mddev) { |
e93f68a1 N |
3619 | if (rdev->raid_disk < 0) |
3620 | continue; | |
3621 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3622 | continue; | |
3623 | rdev->raid_disk = rdev->new_raid_disk; | |
3624 | if (rdev->raid_disk < 0) | |
3a981b03 | 3625 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3626 | else { |
36fad858 NK |
3627 | if (sysfs_link_rdev(mddev, rdev)) |
3628 | printk(KERN_WARNING "md: cannot register rd%d" | |
3629 | " for %s after level change\n", | |
3630 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3631 | } |
e93f68a1 N |
3632 | } |
3633 | ||
3634 | module_put(mddev->pers->owner); | |
245f46c2 N |
3635 | mddev->pers = pers; |
3636 | mddev->private = priv; | |
3637 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3638 | mddev->level = mddev->new_level; | |
3639 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3640 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3641 | mddev->delta_disks = 0; |
2c810cdd | 3642 | mddev->reshape_backwards = 0; |
fee68723 | 3643 | mddev->degraded = 0; |
9af204cf TM |
3644 | if (mddev->pers->sync_request == NULL) { |
3645 | /* this is now an array without redundancy, so | |
3646 | * it must always be in_sync | |
3647 | */ | |
3648 | mddev->in_sync = 1; | |
3649 | del_timer_sync(&mddev->safemode_timer); | |
3650 | } | |
245f46c2 N |
3651 | pers->run(mddev); |
3652 | mddev_resume(mddev); | |
3653 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3654 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3655 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3656 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3657 | md_new_event(mddev); |
d9d166c2 N |
3658 | return rv; |
3659 | } | |
3660 | ||
3661 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3662 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3663 | |
d4dbd025 N |
3664 | |
3665 | static ssize_t | |
fd01b88c | 3666 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3667 | { |
3668 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3669 | if (mddev->reshape_position != MaxSector && |
3670 | mddev->layout != mddev->new_layout) | |
3671 | return sprintf(page, "%d (%d)\n", | |
3672 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3673 | return sprintf(page, "%d\n", mddev->layout); |
3674 | } | |
3675 | ||
3676 | static ssize_t | |
fd01b88c | 3677 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 N |
3678 | { |
3679 | char *e; | |
3680 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3681 | |
3682 | if (!*buf || (*e && *e != '\n')) | |
3683 | return -EINVAL; | |
3684 | ||
b3546035 N |
3685 | if (mddev->pers) { |
3686 | int err; | |
50ac168a | 3687 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3688 | return -EBUSY; |
597a711b | 3689 | mddev->new_layout = n; |
50ac168a | 3690 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3691 | if (err) { |
3692 | mddev->new_layout = mddev->layout; | |
b3546035 | 3693 | return err; |
597a711b | 3694 | } |
b3546035 | 3695 | } else { |
08a02ecd | 3696 | mddev->new_layout = n; |
b3546035 N |
3697 | if (mddev->reshape_position == MaxSector) |
3698 | mddev->layout = n; | |
3699 | } | |
d4dbd025 N |
3700 | return len; |
3701 | } | |
3702 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3703 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3704 | |
3705 | ||
eae1701f | 3706 | static ssize_t |
fd01b88c | 3707 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3708 | { |
bb636547 N |
3709 | if (mddev->raid_disks == 0) |
3710 | return 0; | |
08a02ecd N |
3711 | if (mddev->reshape_position != MaxSector && |
3712 | mddev->delta_disks != 0) | |
3713 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3714 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3715 | return sprintf(page, "%d\n", mddev->raid_disks); |
3716 | } | |
3717 | ||
fd01b88c | 3718 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3719 | |
3720 | static ssize_t | |
fd01b88c | 3721 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3722 | { |
da943b99 N |
3723 | char *e; |
3724 | int rv = 0; | |
3725 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3726 | ||
3727 | if (!*buf || (*e && *e != '\n')) | |
3728 | return -EINVAL; | |
3729 | ||
3730 | if (mddev->pers) | |
3731 | rv = update_raid_disks(mddev, n); | |
08a02ecd | 3732 | else if (mddev->reshape_position != MaxSector) { |
c6563a8c | 3733 | struct md_rdev *rdev; |
08a02ecd | 3734 | int olddisks = mddev->raid_disks - mddev->delta_disks; |
c6563a8c N |
3735 | |
3736 | rdev_for_each(rdev, mddev) { | |
3737 | if (olddisks < n && | |
3738 | rdev->data_offset < rdev->new_data_offset) | |
3739 | return -EINVAL; | |
3740 | if (olddisks > n && | |
3741 | rdev->data_offset > rdev->new_data_offset) | |
3742 | return -EINVAL; | |
3743 | } | |
08a02ecd N |
3744 | mddev->delta_disks = n - olddisks; |
3745 | mddev->raid_disks = n; | |
2c810cdd | 3746 | mddev->reshape_backwards = (mddev->delta_disks < 0); |
08a02ecd | 3747 | } else |
da943b99 N |
3748 | mddev->raid_disks = n; |
3749 | return rv ? rv : len; | |
3750 | } | |
3751 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3752 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3753 | |
3b34380a | 3754 | static ssize_t |
fd01b88c | 3755 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3756 | { |
08a02ecd | 3757 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3758 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3759 | return sprintf(page, "%d (%d)\n", | |
3760 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3761 | mddev->chunk_sectors << 9); |
3762 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3763 | } |
3764 | ||
3765 | static ssize_t | |
fd01b88c | 3766 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3767 | { |
3b34380a N |
3768 | char *e; |
3769 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3770 | ||
3b34380a N |
3771 | if (!*buf || (*e && *e != '\n')) |
3772 | return -EINVAL; | |
3773 | ||
b3546035 N |
3774 | if (mddev->pers) { |
3775 | int err; | |
50ac168a | 3776 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3777 | return -EBUSY; |
597a711b | 3778 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3779 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3780 | if (err) { |
3781 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3782 | return err; |
597a711b | 3783 | } |
b3546035 | 3784 | } else { |
664e7c41 | 3785 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3786 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3787 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3788 | } |
3b34380a N |
3789 | return len; |
3790 | } | |
3791 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3792 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3793 | |
a94213b1 | 3794 | static ssize_t |
fd01b88c | 3795 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3796 | { |
d1a7c503 N |
3797 | if (mddev->recovery_cp == MaxSector) |
3798 | return sprintf(page, "none\n"); | |
a94213b1 N |
3799 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3800 | } | |
3801 | ||
3802 | static ssize_t | |
fd01b88c | 3803 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3804 | { |
a94213b1 N |
3805 | char *e; |
3806 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3807 | ||
b098636c | 3808 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3809 | return -EBUSY; |
06e3c817 DW |
3810 | if (cmd_match(buf, "none")) |
3811 | n = MaxSector; | |
3812 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3813 | return -EINVAL; |
3814 | ||
3815 | mddev->recovery_cp = n; | |
3816 | return len; | |
3817 | } | |
3818 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3819 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3820 | |
9e653b63 N |
3821 | /* |
3822 | * The array state can be: | |
3823 | * | |
3824 | * clear | |
3825 | * No devices, no size, no level | |
3826 | * Equivalent to STOP_ARRAY ioctl | |
3827 | * inactive | |
3828 | * May have some settings, but array is not active | |
3829 | * all IO results in error | |
3830 | * When written, doesn't tear down array, but just stops it | |
3831 | * suspended (not supported yet) | |
3832 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3833 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3834 | * readonly |
3835 | * no resync can happen. no superblocks get written. | |
3836 | * write requests fail | |
3837 | * read-auto | |
3838 | * like readonly, but behaves like 'clean' on a write request. | |
3839 | * | |
3840 | * clean - no pending writes, but otherwise active. | |
3841 | * When written to inactive array, starts without resync | |
3842 | * If a write request arrives then | |
3843 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3844 | * if not known, block and switch to write-pending | |
3845 | * If written to an active array that has pending writes, then fails. | |
3846 | * active | |
3847 | * fully active: IO and resync can be happening. | |
3848 | * When written to inactive array, starts with resync | |
3849 | * | |
3850 | * write-pending | |
3851 | * clean, but writes are blocked waiting for 'active' to be written. | |
3852 | * | |
3853 | * active-idle | |
3854 | * like active, but no writes have been seen for a while (100msec). | |
3855 | * | |
3856 | */ | |
3857 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3858 | write_pending, active_idle, bad_word}; | |
05381954 | 3859 | static char *array_states[] = { |
9e653b63 N |
3860 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3861 | "write-pending", "active-idle", NULL }; | |
3862 | ||
3863 | static int match_word(const char *word, char **list) | |
3864 | { | |
3865 | int n; | |
3866 | for (n=0; list[n]; n++) | |
3867 | if (cmd_match(word, list[n])) | |
3868 | break; | |
3869 | return n; | |
3870 | } | |
3871 | ||
3872 | static ssize_t | |
fd01b88c | 3873 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3874 | { |
3875 | enum array_state st = inactive; | |
3876 | ||
3877 | if (mddev->pers) | |
3878 | switch(mddev->ro) { | |
3879 | case 1: | |
3880 | st = readonly; | |
3881 | break; | |
3882 | case 2: | |
3883 | st = read_auto; | |
3884 | break; | |
3885 | case 0: | |
3886 | if (mddev->in_sync) | |
3887 | st = clean; | |
070dc6dd | 3888 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3889 | st = write_pending; |
9e653b63 N |
3890 | else if (mddev->safemode) |
3891 | st = active_idle; | |
3892 | else | |
3893 | st = active; | |
3894 | } | |
3895 | else { | |
3896 | if (list_empty(&mddev->disks) && | |
3897 | mddev->raid_disks == 0 && | |
58c0fed4 | 3898 | mddev->dev_sectors == 0) |
9e653b63 N |
3899 | st = clear; |
3900 | else | |
3901 | st = inactive; | |
3902 | } | |
3903 | return sprintf(page, "%s\n", array_states[st]); | |
3904 | } | |
3905 | ||
fd01b88c N |
3906 | static int do_md_stop(struct mddev * mddev, int ro, int is_open); |
3907 | static int md_set_readonly(struct mddev * mddev, int is_open); | |
3908 | static int do_md_run(struct mddev * mddev); | |
3909 | static int restart_array(struct mddev *mddev); | |
9e653b63 N |
3910 | |
3911 | static ssize_t | |
fd01b88c | 3912 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 N |
3913 | { |
3914 | int err = -EINVAL; | |
3915 | enum array_state st = match_word(buf, array_states); | |
3916 | switch(st) { | |
3917 | case bad_word: | |
3918 | break; | |
3919 | case clear: | |
3920 | /* stopping an active array */ | |
f2ea68cf | 3921 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3922 | return -EBUSY; |
df5b20cf | 3923 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3924 | break; |
3925 | case inactive: | |
3926 | /* stopping an active array */ | |
3927 | if (mddev->pers) { | |
f2ea68cf | 3928 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3929 | return -EBUSY; |
df5b20cf | 3930 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3931 | } else |
3932 | err = 0; /* already inactive */ | |
9e653b63 N |
3933 | break; |
3934 | case suspended: | |
3935 | break; /* not supported yet */ | |
3936 | case readonly: | |
3937 | if (mddev->pers) | |
a4bd82d0 | 3938 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3939 | else { |
3940 | mddev->ro = 1; | |
648b629e | 3941 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3942 | err = do_md_run(mddev); |
3943 | } | |
3944 | break; | |
3945 | case read_auto: | |
9e653b63 | 3946 | if (mddev->pers) { |
80268ee9 | 3947 | if (mddev->ro == 0) |
a4bd82d0 | 3948 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3949 | else if (mddev->ro == 1) |
648b629e N |
3950 | err = restart_array(mddev); |
3951 | if (err == 0) { | |
3952 | mddev->ro = 2; | |
3953 | set_disk_ro(mddev->gendisk, 0); | |
3954 | } | |
9e653b63 N |
3955 | } else { |
3956 | mddev->ro = 2; | |
3957 | err = do_md_run(mddev); | |
3958 | } | |
3959 | break; | |
3960 | case clean: | |
3961 | if (mddev->pers) { | |
3962 | restart_array(mddev); | |
3963 | spin_lock_irq(&mddev->write_lock); | |
3964 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3965 | if (mddev->in_sync == 0) { |
3966 | mddev->in_sync = 1; | |
31a59e34 N |
3967 | if (mddev->safemode == 1) |
3968 | mddev->safemode = 0; | |
070dc6dd | 3969 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3970 | } |
3971 | err = 0; | |
3972 | } else | |
3973 | err = -EBUSY; | |
9e653b63 | 3974 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3975 | } else |
3976 | err = -EINVAL; | |
9e653b63 N |
3977 | break; |
3978 | case active: | |
3979 | if (mddev->pers) { | |
3980 | restart_array(mddev); | |
070dc6dd | 3981 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3982 | wake_up(&mddev->sb_wait); |
3983 | err = 0; | |
3984 | } else { | |
3985 | mddev->ro = 0; | |
648b629e | 3986 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3987 | err = do_md_run(mddev); |
3988 | } | |
3989 | break; | |
3990 | case write_pending: | |
3991 | case active_idle: | |
3992 | /* these cannot be set */ | |
3993 | break; | |
3994 | } | |
3995 | if (err) | |
3996 | return err; | |
0fd62b86 | 3997 | else { |
1d23f178 N |
3998 | if (mddev->hold_active == UNTIL_IOCTL) |
3999 | mddev->hold_active = 0; | |
00bcb4ac | 4000 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 4001 | return len; |
0fd62b86 | 4002 | } |
9e653b63 | 4003 | } |
80ca3a44 N |
4004 | static struct md_sysfs_entry md_array_state = |
4005 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 4006 | |
1e50915f | 4007 | static ssize_t |
fd01b88c | 4008 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
4009 | return sprintf(page, "%d\n", |
4010 | atomic_read(&mddev->max_corr_read_errors)); | |
4011 | } | |
4012 | ||
4013 | static ssize_t | |
fd01b88c | 4014 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f RB |
4015 | { |
4016 | char *e; | |
4017 | unsigned long n = simple_strtoul(buf, &e, 10); | |
4018 | ||
4019 | if (*buf && (*e == 0 || *e == '\n')) { | |
4020 | atomic_set(&mddev->max_corr_read_errors, n); | |
4021 | return len; | |
4022 | } | |
4023 | return -EINVAL; | |
4024 | } | |
4025 | ||
4026 | static struct md_sysfs_entry max_corr_read_errors = | |
4027 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
4028 | max_corrected_read_errors_store); | |
4029 | ||
6d7ff738 | 4030 | static ssize_t |
fd01b88c | 4031 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
4032 | { |
4033 | return -EINVAL; | |
4034 | } | |
4035 | ||
4036 | static ssize_t | |
fd01b88c | 4037 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
4038 | { |
4039 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
4040 | /* The new device is added to the array. | |
4041 | * If the array has a persistent superblock, we read the | |
4042 | * superblock to initialise info and check validity. | |
4043 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
4044 | * which mainly checks size. | |
4045 | */ | |
4046 | char *e; | |
4047 | int major = simple_strtoul(buf, &e, 10); | |
4048 | int minor; | |
4049 | dev_t dev; | |
3cb03002 | 4050 | struct md_rdev *rdev; |
6d7ff738 N |
4051 | int err; |
4052 | ||
4053 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
4054 | return -EINVAL; | |
4055 | minor = simple_strtoul(e+1, &e, 10); | |
4056 | if (*e && *e != '\n') | |
4057 | return -EINVAL; | |
4058 | dev = MKDEV(major, minor); | |
4059 | if (major != MAJOR(dev) || | |
4060 | minor != MINOR(dev)) | |
4061 | return -EOVERFLOW; | |
4062 | ||
4063 | ||
4064 | if (mddev->persistent) { | |
4065 | rdev = md_import_device(dev, mddev->major_version, | |
4066 | mddev->minor_version); | |
4067 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
4068 | struct md_rdev *rdev0 |
4069 | = list_entry(mddev->disks.next, | |
4070 | struct md_rdev, same_set); | |
6d7ff738 N |
4071 | err = super_types[mddev->major_version] |
4072 | .load_super(rdev, rdev0, mddev->minor_version); | |
4073 | if (err < 0) | |
4074 | goto out; | |
4075 | } | |
c5d79adb N |
4076 | } else if (mddev->external) |
4077 | rdev = md_import_device(dev, -2, -1); | |
4078 | else | |
6d7ff738 N |
4079 | rdev = md_import_device(dev, -1, -1); |
4080 | ||
4081 | if (IS_ERR(rdev)) | |
4082 | return PTR_ERR(rdev); | |
4083 | err = bind_rdev_to_array(rdev, mddev); | |
4084 | out: | |
4085 | if (err) | |
4086 | export_rdev(rdev); | |
4087 | return err ? err : len; | |
4088 | } | |
4089 | ||
4090 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 4091 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 4092 | |
9b1d1dac | 4093 | static ssize_t |
fd01b88c | 4094 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
4095 | { |
4096 | char *end; | |
4097 | unsigned long chunk, end_chunk; | |
4098 | ||
4099 | if (!mddev->bitmap) | |
4100 | goto out; | |
4101 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
4102 | while (*buf) { | |
4103 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
4104 | if (buf == end) break; | |
4105 | if (*end == '-') { /* range */ | |
4106 | buf = end + 1; | |
4107 | end_chunk = simple_strtoul(buf, &end, 0); | |
4108 | if (buf == end) break; | |
4109 | } | |
4110 | if (*end && !isspace(*end)) break; | |
4111 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 4112 | buf = skip_spaces(end); |
9b1d1dac PC |
4113 | } |
4114 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
4115 | out: | |
4116 | return len; | |
4117 | } | |
4118 | ||
4119 | static struct md_sysfs_entry md_bitmap = | |
4120 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
4121 | ||
a35b0d69 | 4122 | static ssize_t |
fd01b88c | 4123 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 4124 | { |
58c0fed4 AN |
4125 | return sprintf(page, "%llu\n", |
4126 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
4127 | } |
4128 | ||
fd01b88c | 4129 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
4130 | |
4131 | static ssize_t | |
fd01b88c | 4132 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
4133 | { |
4134 | /* If array is inactive, we can reduce the component size, but | |
4135 | * not increase it (except from 0). | |
4136 | * If array is active, we can try an on-line resize | |
4137 | */ | |
b522adcd DW |
4138 | sector_t sectors; |
4139 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 4140 | |
58c0fed4 AN |
4141 | if (err < 0) |
4142 | return err; | |
a35b0d69 | 4143 | if (mddev->pers) { |
58c0fed4 | 4144 | err = update_size(mddev, sectors); |
850b2b42 | 4145 | md_update_sb(mddev, 1); |
a35b0d69 | 4146 | } else { |
58c0fed4 AN |
4147 | if (mddev->dev_sectors == 0 || |
4148 | mddev->dev_sectors > sectors) | |
4149 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
4150 | else |
4151 | err = -ENOSPC; | |
4152 | } | |
4153 | return err ? err : len; | |
4154 | } | |
4155 | ||
4156 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 4157 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 4158 | |
8bb93aac N |
4159 | |
4160 | /* Metdata version. | |
e691063a N |
4161 | * This is one of |
4162 | * 'none' for arrays with no metadata (good luck...) | |
4163 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
4164 | * or N.M for internally known formats |
4165 | */ | |
4166 | static ssize_t | |
fd01b88c | 4167 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
4168 | { |
4169 | if (mddev->persistent) | |
4170 | return sprintf(page, "%d.%d\n", | |
4171 | mddev->major_version, mddev->minor_version); | |
e691063a N |
4172 | else if (mddev->external) |
4173 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
4174 | else |
4175 | return sprintf(page, "none\n"); | |
4176 | } | |
4177 | ||
4178 | static ssize_t | |
fd01b88c | 4179 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
4180 | { |
4181 | int major, minor; | |
4182 | char *e; | |
ea43ddd8 N |
4183 | /* Changing the details of 'external' metadata is |
4184 | * always permitted. Otherwise there must be | |
4185 | * no devices attached to the array. | |
4186 | */ | |
4187 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
4188 | ; | |
4189 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
4190 | return -EBUSY; |
4191 | ||
4192 | if (cmd_match(buf, "none")) { | |
4193 | mddev->persistent = 0; | |
e691063a N |
4194 | mddev->external = 0; |
4195 | mddev->major_version = 0; | |
4196 | mddev->minor_version = 90; | |
4197 | return len; | |
4198 | } | |
4199 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4200 | size_t namelen = len-9; |
e691063a N |
4201 | if (namelen >= sizeof(mddev->metadata_type)) |
4202 | namelen = sizeof(mddev->metadata_type)-1; | |
4203 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4204 | mddev->metadata_type[namelen] = 0; | |
4205 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4206 | mddev->metadata_type[--namelen] = 0; | |
4207 | mddev->persistent = 0; | |
4208 | mddev->external = 1; | |
8bb93aac N |
4209 | mddev->major_version = 0; |
4210 | mddev->minor_version = 90; | |
4211 | return len; | |
4212 | } | |
4213 | major = simple_strtoul(buf, &e, 10); | |
4214 | if (e==buf || *e != '.') | |
4215 | return -EINVAL; | |
4216 | buf = e+1; | |
4217 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4218 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 4219 | return -EINVAL; |
50511da3 | 4220 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
4221 | return -ENOENT; |
4222 | mddev->major_version = major; | |
4223 | mddev->minor_version = minor; | |
4224 | mddev->persistent = 1; | |
e691063a | 4225 | mddev->external = 0; |
8bb93aac N |
4226 | return len; |
4227 | } | |
4228 | ||
4229 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 4230 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4231 | |
24dd469d | 4232 | static ssize_t |
fd01b88c | 4233 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4234 | { |
7eec314d | 4235 | char *type = "idle"; |
b6a9ce68 N |
4236 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
4237 | type = "frozen"; | |
4238 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 4239 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
4240 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4241 | type = "reshape"; | |
4242 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
4243 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
4244 | type = "resync"; | |
4245 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
4246 | type = "check"; | |
4247 | else | |
4248 | type = "repair"; | |
72a23c21 | 4249 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
4250 | type = "recover"; |
4251 | } | |
4252 | return sprintf(page, "%s\n", type); | |
4253 | } | |
4254 | ||
fd01b88c | 4255 | static void reap_sync_thread(struct mddev *mddev); |
7ebc0be7 | 4256 | |
24dd469d | 4257 | static ssize_t |
fd01b88c | 4258 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4259 | { |
7eec314d N |
4260 | if (!mddev->pers || !mddev->pers->sync_request) |
4261 | return -EINVAL; | |
4262 | ||
b6a9ce68 N |
4263 | if (cmd_match(page, "frozen")) |
4264 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4265 | else | |
4266 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4267 | ||
4268 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
4269 | if (mddev->sync_thread) { |
4270 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 4271 | reap_sync_thread(mddev); |
7eec314d | 4272 | } |
03c902e1 N |
4273 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4274 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4275 | return -EBUSY; |
72a23c21 NB |
4276 | else if (cmd_match(page, "resync")) |
4277 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4278 | else if (cmd_match(page, "recover")) { | |
4279 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4280 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4281 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4282 | int err; |
4283 | if (mddev->pers->start_reshape == NULL) | |
4284 | return -EINVAL; | |
4285 | err = mddev->pers->start_reshape(mddev); | |
4286 | if (err) | |
4287 | return err; | |
a99ac971 | 4288 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4289 | } else { |
bce74dac | 4290 | if (cmd_match(page, "check")) |
7eec314d | 4291 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4292 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4293 | return -EINVAL; |
4294 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4295 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4296 | } |
03c902e1 | 4297 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4298 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4299 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4300 | return len; |
4301 | } | |
4302 | ||
9d88883e | 4303 | static ssize_t |
fd01b88c | 4304 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4305 | { |
4306 | return sprintf(page, "%llu\n", | |
4307 | (unsigned long long) mddev->resync_mismatches); | |
4308 | } | |
4309 | ||
80ca3a44 N |
4310 | static struct md_sysfs_entry md_scan_mode = |
4311 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 4312 | |
96de1e66 | 4313 | |
80ca3a44 | 4314 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4315 | |
88202a0c | 4316 | static ssize_t |
fd01b88c | 4317 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4318 | { |
4319 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4320 | mddev->sync_speed_min ? "local": "system"); | |
4321 | } | |
4322 | ||
4323 | static ssize_t | |
fd01b88c | 4324 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4325 | { |
4326 | int min; | |
4327 | char *e; | |
4328 | if (strncmp(buf, "system", 6)==0) { | |
4329 | mddev->sync_speed_min = 0; | |
4330 | return len; | |
4331 | } | |
4332 | min = simple_strtoul(buf, &e, 10); | |
4333 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4334 | return -EINVAL; | |
4335 | mddev->sync_speed_min = min; | |
4336 | return len; | |
4337 | } | |
4338 | ||
4339 | static struct md_sysfs_entry md_sync_min = | |
4340 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4341 | ||
4342 | static ssize_t | |
fd01b88c | 4343 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4344 | { |
4345 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4346 | mddev->sync_speed_max ? "local": "system"); | |
4347 | } | |
4348 | ||
4349 | static ssize_t | |
fd01b88c | 4350 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4351 | { |
4352 | int max; | |
4353 | char *e; | |
4354 | if (strncmp(buf, "system", 6)==0) { | |
4355 | mddev->sync_speed_max = 0; | |
4356 | return len; | |
4357 | } | |
4358 | max = simple_strtoul(buf, &e, 10); | |
4359 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4360 | return -EINVAL; | |
4361 | mddev->sync_speed_max = max; | |
4362 | return len; | |
4363 | } | |
4364 | ||
4365 | static struct md_sysfs_entry md_sync_max = | |
4366 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4367 | ||
d7f3d291 | 4368 | static ssize_t |
fd01b88c | 4369 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4370 | { |
4371 | return sprintf(page, "%d\n", mddev->degraded); | |
4372 | } | |
4373 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4374 | |
90b08710 | 4375 | static ssize_t |
fd01b88c | 4376 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4377 | { |
4378 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4379 | } | |
4380 | ||
4381 | static ssize_t | |
fd01b88c | 4382 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4383 | { |
4384 | long n; | |
4385 | ||
4386 | if (strict_strtol(buf, 10, &n)) | |
4387 | return -EINVAL; | |
4388 | ||
4389 | if (n != 0 && n != 1) | |
4390 | return -EINVAL; | |
4391 | ||
4392 | mddev->parallel_resync = n; | |
4393 | ||
4394 | if (mddev->sync_thread) | |
4395 | wake_up(&resync_wait); | |
4396 | ||
4397 | return len; | |
4398 | } | |
4399 | ||
4400 | /* force parallel resync, even with shared block devices */ | |
4401 | static struct md_sysfs_entry md_sync_force_parallel = | |
4402 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4403 | sync_force_parallel_show, sync_force_parallel_store); | |
4404 | ||
88202a0c | 4405 | static ssize_t |
fd01b88c | 4406 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4407 | { |
4408 | unsigned long resync, dt, db; | |
d1a7c503 N |
4409 | if (mddev->curr_resync == 0) |
4410 | return sprintf(page, "none\n"); | |
9687a60c AN |
4411 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4412 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4413 | if (!dt) dt++; |
9687a60c AN |
4414 | db = resync - mddev->resync_mark_cnt; |
4415 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4416 | } |
4417 | ||
80ca3a44 | 4418 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4419 | |
4420 | static ssize_t | |
fd01b88c | 4421 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4422 | { |
13ae864b | 4423 | unsigned long long max_sectors, resync; |
88202a0c | 4424 | |
acb180b0 N |
4425 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4426 | return sprintf(page, "none\n"); | |
4427 | ||
c804cdec N |
4428 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
4429 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
58c0fed4 | 4430 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4431 | else |
58c0fed4 | 4432 | max_sectors = mddev->dev_sectors; |
88202a0c | 4433 | |
acb180b0 | 4434 | resync = mddev->curr_resync_completed; |
13ae864b | 4435 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4436 | } |
4437 | ||
80ca3a44 | 4438 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4439 | |
5e96ee65 | 4440 | static ssize_t |
fd01b88c | 4441 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4442 | { |
4443 | return sprintf(page, "%llu\n", | |
4444 | (unsigned long long)mddev->resync_min); | |
4445 | } | |
4446 | static ssize_t | |
fd01b88c | 4447 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4448 | { |
4449 | unsigned long long min; | |
4450 | if (strict_strtoull(buf, 10, &min)) | |
4451 | return -EINVAL; | |
4452 | if (min > mddev->resync_max) | |
4453 | return -EINVAL; | |
4454 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4455 | return -EBUSY; | |
4456 | ||
4457 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4458 | if (mddev->chunk_sectors) { |
2ac06c33 | 4459 | sector_t temp = min; |
9d8f0363 | 4460 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4461 | return -EINVAL; |
4462 | } | |
4463 | mddev->resync_min = min; | |
4464 | ||
4465 | return len; | |
4466 | } | |
4467 | ||
4468 | static struct md_sysfs_entry md_min_sync = | |
4469 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4470 | ||
c6207277 | 4471 | static ssize_t |
fd01b88c | 4472 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4473 | { |
4474 | if (mddev->resync_max == MaxSector) | |
4475 | return sprintf(page, "max\n"); | |
4476 | else | |
4477 | return sprintf(page, "%llu\n", | |
4478 | (unsigned long long)mddev->resync_max); | |
4479 | } | |
4480 | static ssize_t | |
fd01b88c | 4481 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 N |
4482 | { |
4483 | if (strncmp(buf, "max", 3) == 0) | |
4484 | mddev->resync_max = MaxSector; | |
4485 | else { | |
5e96ee65 NB |
4486 | unsigned long long max; |
4487 | if (strict_strtoull(buf, 10, &max)) | |
4488 | return -EINVAL; | |
4489 | if (max < mddev->resync_min) | |
c6207277 N |
4490 | return -EINVAL; |
4491 | if (max < mddev->resync_max && | |
4d484a4a | 4492 | mddev->ro == 0 && |
c6207277 N |
4493 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4494 | return -EBUSY; | |
4495 | ||
4496 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4497 | if (mddev->chunk_sectors) { |
2ac06c33 | 4498 | sector_t temp = max; |
9d8f0363 | 4499 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4500 | return -EINVAL; |
4501 | } | |
4502 | mddev->resync_max = max; | |
4503 | } | |
4504 | wake_up(&mddev->recovery_wait); | |
4505 | return len; | |
4506 | } | |
4507 | ||
4508 | static struct md_sysfs_entry md_max_sync = | |
4509 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4510 | ||
e464eafd | 4511 | static ssize_t |
fd01b88c | 4512 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4513 | { |
4514 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4515 | } | |
4516 | ||
4517 | static ssize_t | |
fd01b88c | 4518 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4519 | { |
4520 | char *e; | |
4521 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4522 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4523 | |
b8d966ef N |
4524 | if (mddev->pers == NULL || |
4525 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4526 | return -EINVAL; |
4527 | if (buf == e || (*e && *e != '\n')) | |
4528 | return -EINVAL; | |
23ddff37 N |
4529 | |
4530 | mddev->suspend_lo = new; | |
4531 | if (new >= old) | |
4532 | /* Shrinking suspended region */ | |
e464eafd | 4533 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4534 | else { |
4535 | /* Expanding suspended region - need to wait */ | |
4536 | mddev->pers->quiesce(mddev, 1); | |
4537 | mddev->pers->quiesce(mddev, 0); | |
4538 | } | |
4539 | return len; | |
e464eafd N |
4540 | } |
4541 | static struct md_sysfs_entry md_suspend_lo = | |
4542 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4543 | ||
4544 | ||
4545 | static ssize_t | |
fd01b88c | 4546 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4547 | { |
4548 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4549 | } | |
4550 | ||
4551 | static ssize_t | |
fd01b88c | 4552 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4553 | { |
4554 | char *e; | |
4555 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4556 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4557 | |
b8d966ef N |
4558 | if (mddev->pers == NULL || |
4559 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4560 | return -EINVAL; |
4561 | if (buf == e || (*e && *e != '\n')) | |
4562 | return -EINVAL; | |
23ddff37 N |
4563 | |
4564 | mddev->suspend_hi = new; | |
4565 | if (new <= old) | |
4566 | /* Shrinking suspended region */ | |
4567 | mddev->pers->quiesce(mddev, 2); | |
4568 | else { | |
4569 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4570 | mddev->pers->quiesce(mddev, 1); |
4571 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4572 | } |
4573 | return len; | |
e464eafd N |
4574 | } |
4575 | static struct md_sysfs_entry md_suspend_hi = | |
4576 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4577 | ||
08a02ecd | 4578 | static ssize_t |
fd01b88c | 4579 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4580 | { |
4581 | if (mddev->reshape_position != MaxSector) | |
4582 | return sprintf(page, "%llu\n", | |
4583 | (unsigned long long)mddev->reshape_position); | |
4584 | strcpy(page, "none\n"); | |
4585 | return 5; | |
4586 | } | |
4587 | ||
4588 | static ssize_t | |
fd01b88c | 4589 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd | 4590 | { |
c6563a8c | 4591 | struct md_rdev *rdev; |
08a02ecd N |
4592 | char *e; |
4593 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4594 | if (mddev->pers) | |
4595 | return -EBUSY; | |
4596 | if (buf == e || (*e && *e != '\n')) | |
4597 | return -EINVAL; | |
4598 | mddev->reshape_position = new; | |
4599 | mddev->delta_disks = 0; | |
2c810cdd | 4600 | mddev->reshape_backwards = 0; |
08a02ecd N |
4601 | mddev->new_level = mddev->level; |
4602 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4603 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
c6563a8c N |
4604 | rdev_for_each(rdev, mddev) |
4605 | rdev->new_data_offset = rdev->data_offset; | |
08a02ecd N |
4606 | return len; |
4607 | } | |
4608 | ||
4609 | static struct md_sysfs_entry md_reshape_position = | |
4610 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4611 | reshape_position_store); | |
4612 | ||
2c810cdd N |
4613 | static ssize_t |
4614 | reshape_direction_show(struct mddev *mddev, char *page) | |
4615 | { | |
4616 | return sprintf(page, "%s\n", | |
4617 | mddev->reshape_backwards ? "backwards" : "forwards"); | |
4618 | } | |
4619 | ||
4620 | static ssize_t | |
4621 | reshape_direction_store(struct mddev *mddev, const char *buf, size_t len) | |
4622 | { | |
4623 | int backwards = 0; | |
4624 | if (cmd_match(buf, "forwards")) | |
4625 | backwards = 0; | |
4626 | else if (cmd_match(buf, "backwards")) | |
4627 | backwards = 1; | |
4628 | else | |
4629 | return -EINVAL; | |
4630 | if (mddev->reshape_backwards == backwards) | |
4631 | return len; | |
4632 | ||
4633 | /* check if we are allowed to change */ | |
4634 | if (mddev->delta_disks) | |
4635 | return -EBUSY; | |
4636 | ||
4637 | if (mddev->persistent && | |
4638 | mddev->major_version == 0) | |
4639 | return -EINVAL; | |
4640 | ||
4641 | mddev->reshape_backwards = backwards; | |
4642 | return len; | |
4643 | } | |
4644 | ||
4645 | static struct md_sysfs_entry md_reshape_direction = | |
4646 | __ATTR(reshape_direction, S_IRUGO|S_IWUSR, reshape_direction_show, | |
4647 | reshape_direction_store); | |
4648 | ||
b522adcd | 4649 | static ssize_t |
fd01b88c | 4650 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4651 | { |
4652 | if (mddev->external_size) | |
4653 | return sprintf(page, "%llu\n", | |
4654 | (unsigned long long)mddev->array_sectors/2); | |
4655 | else | |
4656 | return sprintf(page, "default\n"); | |
4657 | } | |
4658 | ||
4659 | static ssize_t | |
fd01b88c | 4660 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4661 | { |
4662 | sector_t sectors; | |
4663 | ||
4664 | if (strncmp(buf, "default", 7) == 0) { | |
4665 | if (mddev->pers) | |
4666 | sectors = mddev->pers->size(mddev, 0, 0); | |
4667 | else | |
4668 | sectors = mddev->array_sectors; | |
4669 | ||
4670 | mddev->external_size = 0; | |
4671 | } else { | |
4672 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4673 | return -EINVAL; | |
4674 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4675 | return -E2BIG; |
b522adcd DW |
4676 | |
4677 | mddev->external_size = 1; | |
4678 | } | |
4679 | ||
4680 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4681 | if (mddev->pers) { |
4682 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4683 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4684 | } |
b522adcd DW |
4685 | return len; |
4686 | } | |
4687 | ||
4688 | static struct md_sysfs_entry md_array_size = | |
4689 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4690 | array_size_store); | |
e464eafd | 4691 | |
eae1701f N |
4692 | static struct attribute *md_default_attrs[] = { |
4693 | &md_level.attr, | |
d4dbd025 | 4694 | &md_layout.attr, |
eae1701f | 4695 | &md_raid_disks.attr, |
3b34380a | 4696 | &md_chunk_size.attr, |
a35b0d69 | 4697 | &md_size.attr, |
a94213b1 | 4698 | &md_resync_start.attr, |
8bb93aac | 4699 | &md_metadata.attr, |
6d7ff738 | 4700 | &md_new_device.attr, |
16f17b39 | 4701 | &md_safe_delay.attr, |
9e653b63 | 4702 | &md_array_state.attr, |
08a02ecd | 4703 | &md_reshape_position.attr, |
2c810cdd | 4704 | &md_reshape_direction.attr, |
b522adcd | 4705 | &md_array_size.attr, |
1e50915f | 4706 | &max_corr_read_errors.attr, |
411036fa N |
4707 | NULL, |
4708 | }; | |
4709 | ||
4710 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4711 | &md_scan_mode.attr, |
9d88883e | 4712 | &md_mismatches.attr, |
88202a0c N |
4713 | &md_sync_min.attr, |
4714 | &md_sync_max.attr, | |
4715 | &md_sync_speed.attr, | |
90b08710 | 4716 | &md_sync_force_parallel.attr, |
88202a0c | 4717 | &md_sync_completed.attr, |
5e96ee65 | 4718 | &md_min_sync.attr, |
c6207277 | 4719 | &md_max_sync.attr, |
e464eafd N |
4720 | &md_suspend_lo.attr, |
4721 | &md_suspend_hi.attr, | |
9b1d1dac | 4722 | &md_bitmap.attr, |
d7f3d291 | 4723 | &md_degraded.attr, |
eae1701f N |
4724 | NULL, |
4725 | }; | |
411036fa N |
4726 | static struct attribute_group md_redundancy_group = { |
4727 | .name = NULL, | |
4728 | .attrs = md_redundancy_attrs, | |
4729 | }; | |
4730 | ||
eae1701f N |
4731 | |
4732 | static ssize_t | |
4733 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4734 | { | |
4735 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4736 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4737 | ssize_t rv; |
eae1701f N |
4738 | |
4739 | if (!entry->show) | |
4740 | return -EIO; | |
af8a2434 N |
4741 | spin_lock(&all_mddevs_lock); |
4742 | if (list_empty(&mddev->all_mddevs)) { | |
4743 | spin_unlock(&all_mddevs_lock); | |
4744 | return -EBUSY; | |
4745 | } | |
4746 | mddev_get(mddev); | |
4747 | spin_unlock(&all_mddevs_lock); | |
4748 | ||
5dc5cf7d IM |
4749 | rv = mddev_lock(mddev); |
4750 | if (!rv) { | |
4751 | rv = entry->show(mddev, page); | |
4752 | mddev_unlock(mddev); | |
4753 | } | |
af8a2434 | 4754 | mddev_put(mddev); |
96de1e66 | 4755 | return rv; |
eae1701f N |
4756 | } |
4757 | ||
4758 | static ssize_t | |
4759 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4760 | const char *page, size_t length) | |
4761 | { | |
4762 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4763 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4764 | ssize_t rv; |
eae1701f N |
4765 | |
4766 | if (!entry->store) | |
4767 | return -EIO; | |
67463acb N |
4768 | if (!capable(CAP_SYS_ADMIN)) |
4769 | return -EACCES; | |
af8a2434 N |
4770 | spin_lock(&all_mddevs_lock); |
4771 | if (list_empty(&mddev->all_mddevs)) { | |
4772 | spin_unlock(&all_mddevs_lock); | |
4773 | return -EBUSY; | |
4774 | } | |
4775 | mddev_get(mddev); | |
4776 | spin_unlock(&all_mddevs_lock); | |
5dc5cf7d IM |
4777 | rv = mddev_lock(mddev); |
4778 | if (!rv) { | |
4779 | rv = entry->store(mddev, page, length); | |
4780 | mddev_unlock(mddev); | |
4781 | } | |
af8a2434 | 4782 | mddev_put(mddev); |
96de1e66 | 4783 | return rv; |
eae1701f N |
4784 | } |
4785 | ||
4786 | static void md_free(struct kobject *ko) | |
4787 | { | |
fd01b88c | 4788 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4789 | |
4790 | if (mddev->sysfs_state) | |
4791 | sysfs_put(mddev->sysfs_state); | |
4792 | ||
4793 | if (mddev->gendisk) { | |
4794 | del_gendisk(mddev->gendisk); | |
4795 | put_disk(mddev->gendisk); | |
4796 | } | |
4797 | if (mddev->queue) | |
4798 | blk_cleanup_queue(mddev->queue); | |
4799 | ||
eae1701f N |
4800 | kfree(mddev); |
4801 | } | |
4802 | ||
52cf25d0 | 4803 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4804 | .show = md_attr_show, |
4805 | .store = md_attr_store, | |
4806 | }; | |
4807 | static struct kobj_type md_ktype = { | |
4808 | .release = md_free, | |
4809 | .sysfs_ops = &md_sysfs_ops, | |
4810 | .default_attrs = md_default_attrs, | |
4811 | }; | |
4812 | ||
1da177e4 LT |
4813 | int mdp_major = 0; |
4814 | ||
5fd3a17e DW |
4815 | static void mddev_delayed_delete(struct work_struct *ws) |
4816 | { | |
fd01b88c | 4817 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4818 | |
43a70507 | 4819 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4820 | kobject_del(&mddev->kobj); |
4821 | kobject_put(&mddev->kobj); | |
4822 | } | |
4823 | ||
efeb53c0 | 4824 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4825 | { |
48c9c27b | 4826 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4827 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4828 | struct gendisk *disk; |
efeb53c0 N |
4829 | int partitioned; |
4830 | int shift; | |
4831 | int unit; | |
3830c62f | 4832 | int error; |
1da177e4 LT |
4833 | |
4834 | if (!mddev) | |
efeb53c0 N |
4835 | return -ENODEV; |
4836 | ||
4837 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4838 | shift = partitioned ? MdpMinorShift : 0; | |
4839 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4840 | |
e804ac78 TH |
4841 | /* wait for any previous instance of this device to be |
4842 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4843 | */ |
e804ac78 | 4844 | flush_workqueue(md_misc_wq); |
d3374825 | 4845 | |
48c9c27b | 4846 | mutex_lock(&disks_mutex); |
0909dc44 N |
4847 | error = -EEXIST; |
4848 | if (mddev->gendisk) | |
4849 | goto abort; | |
efeb53c0 N |
4850 | |
4851 | if (name) { | |
4852 | /* Need to ensure that 'name' is not a duplicate. | |
4853 | */ | |
fd01b88c | 4854 | struct mddev *mddev2; |
efeb53c0 N |
4855 | spin_lock(&all_mddevs_lock); |
4856 | ||
4857 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4858 | if (mddev2->gendisk && | |
4859 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4860 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4861 | goto abort; |
efeb53c0 N |
4862 | } |
4863 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4864 | } |
8b765398 | 4865 | |
0909dc44 | 4866 | error = -ENOMEM; |
8b765398 | 4867 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4868 | if (!mddev->queue) |
4869 | goto abort; | |
409c57f3 N |
4870 | mddev->queue->queuedata = mddev; |
4871 | ||
409c57f3 | 4872 | blk_queue_make_request(mddev->queue, md_make_request); |
b1bd055d | 4873 | blk_set_stacking_limits(&mddev->queue->limits); |
8b765398 | 4874 | |
1da177e4 LT |
4875 | disk = alloc_disk(1 << shift); |
4876 | if (!disk) { | |
8b765398 N |
4877 | blk_cleanup_queue(mddev->queue); |
4878 | mddev->queue = NULL; | |
0909dc44 | 4879 | goto abort; |
1da177e4 | 4880 | } |
efeb53c0 | 4881 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4882 | disk->first_minor = unit << shift; |
efeb53c0 N |
4883 | if (name) |
4884 | strcpy(disk->disk_name, name); | |
4885 | else if (partitioned) | |
1da177e4 | 4886 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4887 | else |
1da177e4 | 4888 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4889 | disk->fops = &md_fops; |
4890 | disk->private_data = mddev; | |
4891 | disk->queue = mddev->queue; | |
b0140891 | 4892 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4893 | /* Allow extended partitions. This makes the |
d3374825 | 4894 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4895 | * remove it now. |
4896 | */ | |
4897 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4898 | mddev->gendisk = disk; |
b0140891 N |
4899 | /* As soon as we call add_disk(), another thread could get |
4900 | * through to md_open, so make sure it doesn't get too far | |
4901 | */ | |
4902 | mutex_lock(&mddev->open_mutex); | |
4903 | add_disk(disk); | |
4904 | ||
ed9e1982 TH |
4905 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4906 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4907 | if (error) { |
4908 | /* This isn't possible, but as kobject_init_and_add is marked | |
4909 | * __must_check, we must do something with the result | |
4910 | */ | |
5e55e2f5 N |
4911 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4912 | disk->disk_name); | |
0909dc44 N |
4913 | error = 0; |
4914 | } | |
00bcb4ac N |
4915 | if (mddev->kobj.sd && |
4916 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4917 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4918 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4919 | abort: |
4920 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4921 | if (!error && mddev->kobj.sd) { |
3830c62f | 4922 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4923 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4924 | } |
d3374825 | 4925 | mddev_put(mddev); |
0909dc44 | 4926 | return error; |
efeb53c0 N |
4927 | } |
4928 | ||
4929 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4930 | { | |
4931 | md_alloc(dev, NULL); | |
1da177e4 LT |
4932 | return NULL; |
4933 | } | |
4934 | ||
efeb53c0 N |
4935 | static int add_named_array(const char *val, struct kernel_param *kp) |
4936 | { | |
4937 | /* val must be "md_*" where * is not all digits. | |
4938 | * We allocate an array with a large free minor number, and | |
4939 | * set the name to val. val must not already be an active name. | |
4940 | */ | |
4941 | int len = strlen(val); | |
4942 | char buf[DISK_NAME_LEN]; | |
4943 | ||
4944 | while (len && val[len-1] == '\n') | |
4945 | len--; | |
4946 | if (len >= DISK_NAME_LEN) | |
4947 | return -E2BIG; | |
4948 | strlcpy(buf, val, len+1); | |
4949 | if (strncmp(buf, "md_", 3) != 0) | |
4950 | return -EINVAL; | |
4951 | return md_alloc(0, buf); | |
4952 | } | |
4953 | ||
1da177e4 LT |
4954 | static void md_safemode_timeout(unsigned long data) |
4955 | { | |
fd01b88c | 4956 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 4957 | |
0fd62b86 NB |
4958 | if (!atomic_read(&mddev->writes_pending)) { |
4959 | mddev->safemode = 1; | |
4960 | if (mddev->external) | |
00bcb4ac | 4961 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4962 | } |
1da177e4 LT |
4963 | md_wakeup_thread(mddev->thread); |
4964 | } | |
4965 | ||
6ff8d8ec | 4966 | static int start_dirty_degraded; |
1da177e4 | 4967 | |
fd01b88c | 4968 | int md_run(struct mddev *mddev) |
1da177e4 | 4969 | { |
2604b703 | 4970 | int err; |
3cb03002 | 4971 | struct md_rdev *rdev; |
84fc4b56 | 4972 | struct md_personality *pers; |
1da177e4 | 4973 | |
a757e64c N |
4974 | if (list_empty(&mddev->disks)) |
4975 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4976 | return -EINVAL; |
1da177e4 LT |
4977 | |
4978 | if (mddev->pers) | |
4979 | return -EBUSY; | |
bb4f1e9d N |
4980 | /* Cannot run until previous stop completes properly */ |
4981 | if (mddev->sysfs_active) | |
4982 | return -EBUSY; | |
b6eb127d | 4983 | |
1da177e4 LT |
4984 | /* |
4985 | * Analyze all RAID superblock(s) | |
4986 | */ | |
1ec4a939 N |
4987 | if (!mddev->raid_disks) { |
4988 | if (!mddev->persistent) | |
4989 | return -EINVAL; | |
a757e64c | 4990 | analyze_sbs(mddev); |
1ec4a939 | 4991 | } |
1da177e4 | 4992 | |
d9d166c2 N |
4993 | if (mddev->level != LEVEL_NONE) |
4994 | request_module("md-level-%d", mddev->level); | |
4995 | else if (mddev->clevel[0]) | |
4996 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4997 | |
4998 | /* | |
4999 | * Drop all container device buffers, from now on | |
5000 | * the only valid external interface is through the md | |
5001 | * device. | |
1da177e4 | 5002 | */ |
dafb20fa | 5003 | rdev_for_each(rdev, mddev) { |
b2d444d7 | 5004 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5005 | continue; |
5006 | sync_blockdev(rdev->bdev); | |
f98393a6 | 5007 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
5008 | |
5009 | /* perform some consistency tests on the device. | |
5010 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 5011 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 5012 | */ |
a6ff7e08 JB |
5013 | if (rdev->meta_bdev) { |
5014 | /* Nothing to check */; | |
5015 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
5016 | if (mddev->dev_sectors && |
5017 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 5018 | > rdev->sb_start) { |
f0d76d70 N |
5019 | printk("md: %s: data overlaps metadata\n", |
5020 | mdname(mddev)); | |
5021 | return -EINVAL; | |
5022 | } | |
5023 | } else { | |
0f420358 | 5024 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
5025 | > rdev->data_offset) { |
5026 | printk("md: %s: metadata overlaps data\n", | |
5027 | mdname(mddev)); | |
5028 | return -EINVAL; | |
5029 | } | |
5030 | } | |
00bcb4ac | 5031 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
5032 | } |
5033 | ||
a167f663 | 5034 | if (mddev->bio_set == NULL) |
a519b26d | 5035 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, |
fd01b88c | 5036 | sizeof(struct mddev *)); |
a167f663 | 5037 | |
1da177e4 | 5038 | spin_lock(&pers_lock); |
d9d166c2 | 5039 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 5040 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 5041 | spin_unlock(&pers_lock); |
d9d166c2 N |
5042 | if (mddev->level != LEVEL_NONE) |
5043 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
5044 | mddev->level); | |
5045 | else | |
5046 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
5047 | mddev->clevel); | |
1da177e4 LT |
5048 | return -EINVAL; |
5049 | } | |
2604b703 | 5050 | mddev->pers = pers; |
1da177e4 | 5051 | spin_unlock(&pers_lock); |
34817e8c N |
5052 | if (mddev->level != pers->level) { |
5053 | mddev->level = pers->level; | |
5054 | mddev->new_level = pers->level; | |
5055 | } | |
d9d166c2 | 5056 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 5057 | |
f6705578 | 5058 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 5059 | pers->start_reshape == NULL) { |
f6705578 N |
5060 | /* This personality cannot handle reshaping... */ |
5061 | mddev->pers = NULL; | |
5062 | module_put(pers->owner); | |
5063 | return -EINVAL; | |
5064 | } | |
5065 | ||
7dd5e7c3 N |
5066 | if (pers->sync_request) { |
5067 | /* Warn if this is a potentially silly | |
5068 | * configuration. | |
5069 | */ | |
5070 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5071 | struct md_rdev *rdev2; |
7dd5e7c3 | 5072 | int warned = 0; |
159ec1fc | 5073 | |
dafb20fa N |
5074 | rdev_for_each(rdev, mddev) |
5075 | rdev_for_each(rdev2, mddev) { | |
7dd5e7c3 N |
5076 | if (rdev < rdev2 && |
5077 | rdev->bdev->bd_contains == | |
5078 | rdev2->bdev->bd_contains) { | |
5079 | printk(KERN_WARNING | |
5080 | "%s: WARNING: %s appears to be" | |
5081 | " on the same physical disk as" | |
5082 | " %s.\n", | |
5083 | mdname(mddev), | |
5084 | bdevname(rdev->bdev,b), | |
5085 | bdevname(rdev2->bdev,b2)); | |
5086 | warned = 1; | |
5087 | } | |
5088 | } | |
159ec1fc | 5089 | |
7dd5e7c3 N |
5090 | if (warned) |
5091 | printk(KERN_WARNING | |
5092 | "True protection against single-disk" | |
5093 | " failure might be compromised.\n"); | |
5094 | } | |
5095 | ||
657390d2 | 5096 | mddev->recovery = 0; |
58c0fed4 AN |
5097 | /* may be over-ridden by personality */ |
5098 | mddev->resync_max_sectors = mddev->dev_sectors; | |
5099 | ||
6ff8d8ec | 5100 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 5101 | |
0f9552b5 | 5102 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
5103 | mddev->ro = 2; /* read-only, but switch on first write */ |
5104 | ||
b15c2e57 | 5105 | err = mddev->pers->run(mddev); |
13e53df3 AN |
5106 | if (err) |
5107 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
5108 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
5109 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
5110 | " but 'external_size' not in effect?\n", __func__); | |
5111 | printk(KERN_ERR | |
5112 | "md: invalid array_size %llu > default size %llu\n", | |
5113 | (unsigned long long)mddev->array_sectors / 2, | |
5114 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
5115 | err = -EINVAL; | |
5116 | mddev->pers->stop(mddev); | |
5117 | } | |
5118 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
5119 | err = bitmap_create(mddev); |
5120 | if (err) { | |
5121 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
5122 | mdname(mddev), err); | |
5123 | mddev->pers->stop(mddev); | |
5124 | } | |
5125 | } | |
1da177e4 | 5126 | if (err) { |
1da177e4 LT |
5127 | module_put(mddev->pers->owner); |
5128 | mddev->pers = NULL; | |
32a7627c N |
5129 | bitmap_destroy(mddev); |
5130 | return err; | |
1da177e4 | 5131 | } |
5e55e2f5 | 5132 | if (mddev->pers->sync_request) { |
00bcb4ac N |
5133 | if (mddev->kobj.sd && |
5134 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
5135 | printk(KERN_WARNING |
5136 | "md: cannot register extra attributes for %s\n", | |
5137 | mdname(mddev)); | |
00bcb4ac | 5138 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 5139 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
5140 | mddev->ro = 0; |
5141 | ||
1da177e4 | 5142 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
5143 | atomic_set(&mddev->max_corr_read_errors, |
5144 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
5145 | mddev->safemode = 0; |
5146 | mddev->safemode_timer.function = md_safemode_timeout; | |
5147 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 5148 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 5149 | mddev->in_sync = 1; |
0ca69886 N |
5150 | smp_wmb(); |
5151 | mddev->ready = 1; | |
dafb20fa | 5152 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5153 | if (rdev->raid_disk >= 0) |
5154 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 5155 | /* failure here is OK */; |
1da177e4 LT |
5156 | |
5157 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5158 | ||
850b2b42 N |
5159 | if (mddev->flags) |
5160 | md_update_sb(mddev, 0); | |
1da177e4 | 5161 | |
d7603b7e | 5162 | md_new_event(mddev); |
00bcb4ac N |
5163 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
5164 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 5165 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
5166 | return 0; |
5167 | } | |
390ee602 | 5168 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 5169 | |
fd01b88c | 5170 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
5171 | { |
5172 | int err; | |
5173 | ||
5174 | err = md_run(mddev); | |
5175 | if (err) | |
5176 | goto out; | |
69e51b44 N |
5177 | err = bitmap_load(mddev); |
5178 | if (err) { | |
5179 | bitmap_destroy(mddev); | |
5180 | goto out; | |
5181 | } | |
0fd018af JB |
5182 | |
5183 | md_wakeup_thread(mddev->thread); | |
5184 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5185 | ||
fe60b014 N |
5186 | set_capacity(mddev->gendisk, mddev->array_sectors); |
5187 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 5188 | mddev->changed = 1; |
fe60b014 N |
5189 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
5190 | out: | |
5191 | return err; | |
5192 | } | |
5193 | ||
fd01b88c | 5194 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
5195 | { |
5196 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 5197 | |
80fab1d7 | 5198 | /* Complain if it has no devices */ |
1da177e4 | 5199 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
5200 | return -ENXIO; |
5201 | if (!mddev->pers) | |
5202 | return -EINVAL; | |
5203 | if (!mddev->ro) | |
5204 | return -EBUSY; | |
5205 | mddev->safemode = 0; | |
5206 | mddev->ro = 0; | |
5207 | set_disk_ro(disk, 0); | |
5208 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5209 | mdname(mddev)); | |
5210 | /* Kick recovery or resync if necessary */ | |
5211 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5212 | md_wakeup_thread(mddev->thread); | |
5213 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5214 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5215 | return 0; |
1da177e4 LT |
5216 | } |
5217 | ||
acc55e22 N |
5218 | /* similar to deny_write_access, but accounts for our holding a reference |
5219 | * to the file ourselves */ | |
5220 | static int deny_bitmap_write_access(struct file * file) | |
5221 | { | |
5222 | struct inode *inode = file->f_mapping->host; | |
5223 | ||
5224 | spin_lock(&inode->i_lock); | |
5225 | if (atomic_read(&inode->i_writecount) > 1) { | |
5226 | spin_unlock(&inode->i_lock); | |
5227 | return -ETXTBSY; | |
5228 | } | |
5229 | atomic_set(&inode->i_writecount, -1); | |
5230 | spin_unlock(&inode->i_lock); | |
5231 | ||
5232 | return 0; | |
5233 | } | |
5234 | ||
43a70507 | 5235 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
5236 | { |
5237 | struct inode *inode = file->f_mapping->host; | |
5238 | ||
5239 | spin_lock(&inode->i_lock); | |
5240 | atomic_set(&inode->i_writecount, 1); | |
5241 | spin_unlock(&inode->i_lock); | |
5242 | } | |
5243 | ||
fd01b88c | 5244 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5245 | { |
5246 | mddev->array_sectors = 0; | |
5247 | mddev->external_size = 0; | |
5248 | mddev->dev_sectors = 0; | |
5249 | mddev->raid_disks = 0; | |
5250 | mddev->recovery_cp = 0; | |
5251 | mddev->resync_min = 0; | |
5252 | mddev->resync_max = MaxSector; | |
5253 | mddev->reshape_position = MaxSector; | |
5254 | mddev->external = 0; | |
5255 | mddev->persistent = 0; | |
5256 | mddev->level = LEVEL_NONE; | |
5257 | mddev->clevel[0] = 0; | |
5258 | mddev->flags = 0; | |
5259 | mddev->ro = 0; | |
5260 | mddev->metadata_type[0] = 0; | |
5261 | mddev->chunk_sectors = 0; | |
5262 | mddev->ctime = mddev->utime = 0; | |
5263 | mddev->layout = 0; | |
5264 | mddev->max_disks = 0; | |
5265 | mddev->events = 0; | |
a8707c08 | 5266 | mddev->can_decrease_events = 0; |
6177b472 | 5267 | mddev->delta_disks = 0; |
2c810cdd | 5268 | mddev->reshape_backwards = 0; |
6177b472 N |
5269 | mddev->new_level = LEVEL_NONE; |
5270 | mddev->new_layout = 0; | |
5271 | mddev->new_chunk_sectors = 0; | |
5272 | mddev->curr_resync = 0; | |
5273 | mddev->resync_mismatches = 0; | |
5274 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
5275 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5276 | mddev->recovery = 0; | |
5277 | mddev->in_sync = 0; | |
f0b4f7e2 | 5278 | mddev->changed = 0; |
6177b472 | 5279 | mddev->degraded = 0; |
6177b472 | 5280 | mddev->safemode = 0; |
050b6615 | 5281 | mddev->merge_check_needed = 0; |
6177b472 N |
5282 | mddev->bitmap_info.offset = 0; |
5283 | mddev->bitmap_info.default_offset = 0; | |
5284 | mddev->bitmap_info.chunksize = 0; | |
5285 | mddev->bitmap_info.daemon_sleep = 0; | |
5286 | mddev->bitmap_info.max_write_behind = 0; | |
5287 | } | |
5288 | ||
fd01b88c | 5289 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 N |
5290 | { |
5291 | if (mddev->sync_thread) { | |
5292 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5293 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 5294 | reap_sync_thread(mddev); |
a047e125 N |
5295 | } |
5296 | ||
5297 | del_timer_sync(&mddev->safemode_timer); | |
5298 | ||
5299 | bitmap_flush(mddev); | |
5300 | md_super_wait(mddev); | |
5301 | ||
5302 | if (!mddev->in_sync || mddev->flags) { | |
5303 | /* mark array as shutdown cleanly */ | |
5304 | mddev->in_sync = 1; | |
5305 | md_update_sb(mddev, 1); | |
5306 | } | |
5307 | } | |
defad61a | 5308 | |
fd01b88c | 5309 | void md_stop_writes(struct mddev *mddev) |
defad61a N |
5310 | { |
5311 | mddev_lock(mddev); | |
5312 | __md_stop_writes(mddev); | |
5313 | mddev_unlock(mddev); | |
5314 | } | |
390ee602 | 5315 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5316 | |
fd01b88c | 5317 | void md_stop(struct mddev *mddev) |
6177b472 | 5318 | { |
0ca69886 | 5319 | mddev->ready = 0; |
6177b472 N |
5320 | mddev->pers->stop(mddev); |
5321 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
5322 | mddev->to_remove = &md_redundancy_group; | |
5323 | module_put(mddev->pers->owner); | |
5324 | mddev->pers = NULL; | |
cca9cf90 | 5325 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5326 | } |
390ee602 | 5327 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5328 | |
fd01b88c | 5329 | static int md_set_readonly(struct mddev *mddev, int is_open) |
a4bd82d0 N |
5330 | { |
5331 | int err = 0; | |
5332 | mutex_lock(&mddev->open_mutex); | |
5333 | if (atomic_read(&mddev->openers) > is_open) { | |
5334 | printk("md: %s still in use.\n",mdname(mddev)); | |
5335 | err = -EBUSY; | |
5336 | goto out; | |
5337 | } | |
5338 | if (mddev->pers) { | |
defad61a | 5339 | __md_stop_writes(mddev); |
a4bd82d0 N |
5340 | |
5341 | err = -ENXIO; | |
5342 | if (mddev->ro==1) | |
5343 | goto out; | |
5344 | mddev->ro = 1; | |
5345 | set_disk_ro(mddev->gendisk, 1); | |
5346 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 5347 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
5348 | err = 0; |
5349 | } | |
5350 | out: | |
5351 | mutex_unlock(&mddev->open_mutex); | |
5352 | return err; | |
5353 | } | |
5354 | ||
9e653b63 N |
5355 | /* mode: |
5356 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5357 | * 2 - stop but do not disassemble array |
5358 | */ | |
fd01b88c | 5359 | static int do_md_stop(struct mddev * mddev, int mode, int is_open) |
1da177e4 | 5360 | { |
1da177e4 | 5361 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5362 | struct md_rdev *rdev; |
1da177e4 | 5363 | |
c8c00a69 | 5364 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
5365 | if (atomic_read(&mddev->openers) > is_open || |
5366 | mddev->sysfs_active) { | |
df5b20cf | 5367 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
5368 | mutex_unlock(&mddev->open_mutex); |
5369 | return -EBUSY; | |
5370 | } | |
1da177e4 | 5371 | |
6e17b027 | 5372 | if (mddev->pers) { |
a4bd82d0 N |
5373 | if (mddev->ro) |
5374 | set_disk_ro(disk, 0); | |
409c57f3 | 5375 | |
defad61a | 5376 | __md_stop_writes(mddev); |
a4bd82d0 N |
5377 | md_stop(mddev); |
5378 | mddev->queue->merge_bvec_fn = NULL; | |
a4bd82d0 | 5379 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5380 | |
a4bd82d0 | 5381 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5382 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5383 | |
dafb20fa | 5384 | rdev_for_each(rdev, mddev) |
36fad858 NK |
5385 | if (rdev->raid_disk >= 0) |
5386 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5387 | |
a4bd82d0 | 5388 | set_capacity(disk, 0); |
6e17b027 | 5389 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5390 | mddev->changed = 1; |
a4bd82d0 | 5391 | revalidate_disk(disk); |
0d4ca600 | 5392 | |
a4bd82d0 N |
5393 | if (mddev->ro) |
5394 | mddev->ro = 0; | |
6e17b027 N |
5395 | } else |
5396 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5397 | /* |
5398 | * Free resources if final stop | |
5399 | */ | |
9e653b63 | 5400 | if (mode == 0) { |
1da177e4 LT |
5401 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5402 | ||
978f946b | 5403 | bitmap_destroy(mddev); |
c3d9714e N |
5404 | if (mddev->bitmap_info.file) { |
5405 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5406 | fput(mddev->bitmap_info.file); | |
5407 | mddev->bitmap_info.file = NULL; | |
978f946b | 5408 | } |
c3d9714e | 5409 | mddev->bitmap_info.offset = 0; |
978f946b | 5410 | |
1da177e4 LT |
5411 | export_array(mddev); |
5412 | ||
6177b472 | 5413 | md_clean(mddev); |
934d9c23 | 5414 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5415 | if (mddev->hold_active == UNTIL_STOP) |
5416 | mddev->hold_active = 0; | |
a4bd82d0 | 5417 | } |
3f9d99c1 | 5418 | blk_integrity_unregister(disk); |
d7603b7e | 5419 | md_new_event(mddev); |
00bcb4ac | 5420 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5421 | return 0; |
1da177e4 LT |
5422 | } |
5423 | ||
fdee8ae4 | 5424 | #ifndef MODULE |
fd01b88c | 5425 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5426 | { |
3cb03002 | 5427 | struct md_rdev *rdev; |
1da177e4 LT |
5428 | int err; |
5429 | ||
a757e64c | 5430 | if (list_empty(&mddev->disks)) |
1da177e4 | 5431 | return; |
1da177e4 LT |
5432 | |
5433 | printk(KERN_INFO "md: running: "); | |
5434 | ||
dafb20fa | 5435 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
5436 | char b[BDEVNAME_SIZE]; |
5437 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5438 | } | |
5439 | printk("\n"); | |
5440 | ||
d710e138 | 5441 | err = do_md_run(mddev); |
1da177e4 LT |
5442 | if (err) { |
5443 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 5444 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
5445 | } |
5446 | } | |
5447 | ||
5448 | /* | |
5449 | * lets try to run arrays based on all disks that have arrived | |
5450 | * until now. (those are in pending_raid_disks) | |
5451 | * | |
5452 | * the method: pick the first pending disk, collect all disks with | |
5453 | * the same UUID, remove all from the pending list and put them into | |
5454 | * the 'same_array' list. Then order this list based on superblock | |
5455 | * update time (freshest comes first), kick out 'old' disks and | |
5456 | * compare superblocks. If everything's fine then run it. | |
5457 | * | |
5458 | * If "unit" is allocated, then bump its reference count | |
5459 | */ | |
5460 | static void autorun_devices(int part) | |
5461 | { | |
3cb03002 | 5462 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5463 | struct mddev *mddev; |
1da177e4 LT |
5464 | char b[BDEVNAME_SIZE]; |
5465 | ||
5466 | printk(KERN_INFO "md: autorun ...\n"); | |
5467 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5468 | int unit; |
1da177e4 | 5469 | dev_t dev; |
ad01c9e3 | 5470 | LIST_HEAD(candidates); |
1da177e4 | 5471 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5472 | struct md_rdev, same_set); |
1da177e4 LT |
5473 | |
5474 | printk(KERN_INFO "md: considering %s ...\n", | |
5475 | bdevname(rdev0->bdev,b)); | |
5476 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5477 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5478 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5479 | printk(KERN_INFO "md: adding %s ...\n", | |
5480 | bdevname(rdev->bdev,b)); | |
5481 | list_move(&rdev->same_set, &candidates); | |
5482 | } | |
5483 | /* | |
5484 | * now we have a set of devices, with all of them having | |
5485 | * mostly sane superblocks. It's time to allocate the | |
5486 | * mddev. | |
5487 | */ | |
e8703fe1 N |
5488 | if (part) { |
5489 | dev = MKDEV(mdp_major, | |
5490 | rdev0->preferred_minor << MdpMinorShift); | |
5491 | unit = MINOR(dev) >> MdpMinorShift; | |
5492 | } else { | |
5493 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5494 | unit = MINOR(dev); | |
5495 | } | |
5496 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5497 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5498 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5499 | break; | |
5500 | } | |
1da177e4 LT |
5501 | |
5502 | md_probe(dev, NULL, NULL); | |
5503 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5504 | if (!mddev || !mddev->gendisk) { |
5505 | if (mddev) | |
5506 | mddev_put(mddev); | |
5507 | printk(KERN_ERR | |
1da177e4 LT |
5508 | "md: cannot allocate memory for md drive.\n"); |
5509 | break; | |
5510 | } | |
5511 | if (mddev_lock(mddev)) | |
5512 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
5513 | mdname(mddev)); | |
5514 | else if (mddev->raid_disks || mddev->major_version | |
5515 | || !list_empty(&mddev->disks)) { | |
5516 | printk(KERN_WARNING | |
5517 | "md: %s already running, cannot run %s\n", | |
5518 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5519 | mddev_unlock(mddev); | |
5520 | } else { | |
5521 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5522 | mddev->persistent = 1; |
159ec1fc | 5523 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5524 | list_del_init(&rdev->same_set); |
5525 | if (bind_rdev_to_array(rdev, mddev)) | |
5526 | export_rdev(rdev); | |
5527 | } | |
5528 | autorun_array(mddev); | |
5529 | mddev_unlock(mddev); | |
5530 | } | |
5531 | /* on success, candidates will be empty, on error | |
5532 | * it won't... | |
5533 | */ | |
159ec1fc | 5534 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5535 | list_del_init(&rdev->same_set); |
1da177e4 | 5536 | export_rdev(rdev); |
4b80991c | 5537 | } |
1da177e4 LT |
5538 | mddev_put(mddev); |
5539 | } | |
5540 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5541 | } | |
fdee8ae4 | 5542 | #endif /* !MODULE */ |
1da177e4 | 5543 | |
1da177e4 LT |
5544 | static int get_version(void __user * arg) |
5545 | { | |
5546 | mdu_version_t ver; | |
5547 | ||
5548 | ver.major = MD_MAJOR_VERSION; | |
5549 | ver.minor = MD_MINOR_VERSION; | |
5550 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5551 | ||
5552 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5553 | return -EFAULT; | |
5554 | ||
5555 | return 0; | |
5556 | } | |
5557 | ||
fd01b88c | 5558 | static int get_array_info(struct mddev * mddev, void __user * arg) |
1da177e4 LT |
5559 | { |
5560 | mdu_array_info_t info; | |
a9f326eb | 5561 | int nr,working,insync,failed,spare; |
3cb03002 | 5562 | struct md_rdev *rdev; |
1da177e4 | 5563 | |
a9f326eb | 5564 | nr=working=insync=failed=spare=0; |
dafb20fa | 5565 | rdev_for_each(rdev, mddev) { |
1da177e4 | 5566 | nr++; |
b2d444d7 | 5567 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5568 | failed++; |
5569 | else { | |
5570 | working++; | |
b2d444d7 | 5571 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 5572 | insync++; |
1da177e4 LT |
5573 | else |
5574 | spare++; | |
5575 | } | |
5576 | } | |
5577 | ||
5578 | info.major_version = mddev->major_version; | |
5579 | info.minor_version = mddev->minor_version; | |
5580 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5581 | info.ctime = mddev->ctime; | |
5582 | info.level = mddev->level; | |
58c0fed4 AN |
5583 | info.size = mddev->dev_sectors / 2; |
5584 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5585 | info.size = -1; |
1da177e4 LT |
5586 | info.nr_disks = nr; |
5587 | info.raid_disks = mddev->raid_disks; | |
5588 | info.md_minor = mddev->md_minor; | |
5589 | info.not_persistent= !mddev->persistent; | |
5590 | ||
5591 | info.utime = mddev->utime; | |
5592 | info.state = 0; | |
5593 | if (mddev->in_sync) | |
5594 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5595 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5596 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5597 | info.active_disks = insync; |
1da177e4 LT |
5598 | info.working_disks = working; |
5599 | info.failed_disks = failed; | |
5600 | info.spare_disks = spare; | |
5601 | ||
5602 | info.layout = mddev->layout; | |
9d8f0363 | 5603 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5604 | |
5605 | if (copy_to_user(arg, &info, sizeof(info))) | |
5606 | return -EFAULT; | |
5607 | ||
5608 | return 0; | |
5609 | } | |
5610 | ||
fd01b88c | 5611 | static int get_bitmap_file(struct mddev * mddev, void __user * arg) |
32a7627c N |
5612 | { |
5613 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5614 | char *ptr, *buf = NULL; | |
5615 | int err = -ENOMEM; | |
5616 | ||
b5470dc5 DW |
5617 | if (md_allow_write(mddev)) |
5618 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5619 | else | |
5620 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5621 | |
32a7627c N |
5622 | if (!file) |
5623 | goto out; | |
5624 | ||
5625 | /* bitmap disabled, zero the first byte and copy out */ | |
5626 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
5627 | file->pathname[0] = '\0'; | |
5628 | goto copy_out; | |
5629 | } | |
5630 | ||
5631 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5632 | if (!buf) | |
5633 | goto out; | |
5634 | ||
6bcfd601 CH |
5635 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
5636 | if (IS_ERR(ptr)) | |
32a7627c N |
5637 | goto out; |
5638 | ||
5639 | strcpy(file->pathname, ptr); | |
5640 | ||
5641 | copy_out: | |
5642 | err = 0; | |
5643 | if (copy_to_user(arg, file, sizeof(*file))) | |
5644 | err = -EFAULT; | |
5645 | out: | |
5646 | kfree(buf); | |
5647 | kfree(file); | |
5648 | return err; | |
5649 | } | |
5650 | ||
fd01b88c | 5651 | static int get_disk_info(struct mddev * mddev, void __user * arg) |
1da177e4 LT |
5652 | { |
5653 | mdu_disk_info_t info; | |
3cb03002 | 5654 | struct md_rdev *rdev; |
1da177e4 LT |
5655 | |
5656 | if (copy_from_user(&info, arg, sizeof(info))) | |
5657 | return -EFAULT; | |
5658 | ||
26ef379f | 5659 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5660 | if (rdev) { |
5661 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5662 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5663 | info.raid_disk = rdev->raid_disk; | |
5664 | info.state = 0; | |
b2d444d7 | 5665 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5666 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5667 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5668 | info.state |= (1<<MD_DISK_ACTIVE); |
5669 | info.state |= (1<<MD_DISK_SYNC); | |
5670 | } | |
8ddf9efe N |
5671 | if (test_bit(WriteMostly, &rdev->flags)) |
5672 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5673 | } else { |
5674 | info.major = info.minor = 0; | |
5675 | info.raid_disk = -1; | |
5676 | info.state = (1<<MD_DISK_REMOVED); | |
5677 | } | |
5678 | ||
5679 | if (copy_to_user(arg, &info, sizeof(info))) | |
5680 | return -EFAULT; | |
5681 | ||
5682 | return 0; | |
5683 | } | |
5684 | ||
fd01b88c | 5685 | static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5686 | { |
5687 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5688 | struct md_rdev *rdev; |
1da177e4 LT |
5689 | dev_t dev = MKDEV(info->major,info->minor); |
5690 | ||
5691 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5692 | return -EOVERFLOW; | |
5693 | ||
5694 | if (!mddev->raid_disks) { | |
5695 | int err; | |
5696 | /* expecting a device which has a superblock */ | |
5697 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5698 | if (IS_ERR(rdev)) { | |
5699 | printk(KERN_WARNING | |
5700 | "md: md_import_device returned %ld\n", | |
5701 | PTR_ERR(rdev)); | |
5702 | return PTR_ERR(rdev); | |
5703 | } | |
5704 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5705 | struct md_rdev *rdev0 |
5706 | = list_entry(mddev->disks.next, | |
5707 | struct md_rdev, same_set); | |
a9f326eb | 5708 | err = super_types[mddev->major_version] |
1da177e4 LT |
5709 | .load_super(rdev, rdev0, mddev->minor_version); |
5710 | if (err < 0) { | |
5711 | printk(KERN_WARNING | |
5712 | "md: %s has different UUID to %s\n", | |
5713 | bdevname(rdev->bdev,b), | |
5714 | bdevname(rdev0->bdev,b2)); | |
5715 | export_rdev(rdev); | |
5716 | return -EINVAL; | |
5717 | } | |
5718 | } | |
5719 | err = bind_rdev_to_array(rdev, mddev); | |
5720 | if (err) | |
5721 | export_rdev(rdev); | |
5722 | return err; | |
5723 | } | |
5724 | ||
5725 | /* | |
5726 | * add_new_disk can be used once the array is assembled | |
5727 | * to add "hot spares". They must already have a superblock | |
5728 | * written | |
5729 | */ | |
5730 | if (mddev->pers) { | |
5731 | int err; | |
5732 | if (!mddev->pers->hot_add_disk) { | |
5733 | printk(KERN_WARNING | |
5734 | "%s: personality does not support diskops!\n", | |
5735 | mdname(mddev)); | |
5736 | return -EINVAL; | |
5737 | } | |
7b1e35f6 N |
5738 | if (mddev->persistent) |
5739 | rdev = md_import_device(dev, mddev->major_version, | |
5740 | mddev->minor_version); | |
5741 | else | |
5742 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5743 | if (IS_ERR(rdev)) { |
5744 | printk(KERN_WARNING | |
5745 | "md: md_import_device returned %ld\n", | |
5746 | PTR_ERR(rdev)); | |
5747 | return PTR_ERR(rdev); | |
5748 | } | |
1a855a06 | 5749 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5750 | if (!mddev->persistent) { |
5751 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5752 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5753 | rdev->raid_disk = info->raid_disk; |
bf572541 N |
5754 | set_bit(In_sync, &rdev->flags); |
5755 | } else | |
41158c7e N |
5756 | rdev->raid_disk = -1; |
5757 | } else | |
5758 | super_types[mddev->major_version]. | |
5759 | validate_super(mddev, rdev); | |
bedd86b7 N |
5760 | if ((info->state & (1<<MD_DISK_SYNC)) && |
5761 | (!test_bit(In_sync, &rdev->flags) || | |
5762 | rdev->raid_disk != info->raid_disk)) { | |
5763 | /* This was a hot-add request, but events doesn't | |
5764 | * match, so reject it. | |
5765 | */ | |
5766 | export_rdev(rdev); | |
5767 | return -EINVAL; | |
5768 | } | |
5769 | ||
1a855a06 N |
5770 | if (test_bit(In_sync, &rdev->flags)) |
5771 | rdev->saved_raid_disk = rdev->raid_disk; | |
5772 | else | |
5773 | rdev->saved_raid_disk = -1; | |
41158c7e | 5774 | |
b2d444d7 | 5775 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5776 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5777 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5778 | else |
5779 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5780 | |
1da177e4 LT |
5781 | rdev->raid_disk = -1; |
5782 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5783 | if (!err && !mddev->pers->hot_remove_disk) { |
5784 | /* If there is hot_add_disk but no hot_remove_disk | |
5785 | * then added disks for geometry changes, | |
5786 | * and should be added immediately. | |
5787 | */ | |
5788 | super_types[mddev->major_version]. | |
5789 | validate_super(mddev, rdev); | |
5790 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5791 | if (err) | |
5792 | unbind_rdev_from_array(rdev); | |
5793 | } | |
1da177e4 LT |
5794 | if (err) |
5795 | export_rdev(rdev); | |
52664732 | 5796 | else |
00bcb4ac | 5797 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5798 | |
17571284 | 5799 | md_update_sb(mddev, 1); |
72a23c21 NB |
5800 | if (mddev->degraded) |
5801 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5802 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5803 | if (!err) |
5804 | md_new_event(mddev); | |
005eca5e | 5805 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5806 | return err; |
5807 | } | |
5808 | ||
5809 | /* otherwise, add_new_disk is only allowed | |
5810 | * for major_version==0 superblocks | |
5811 | */ | |
5812 | if (mddev->major_version != 0) { | |
5813 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5814 | mdname(mddev)); | |
5815 | return -EINVAL; | |
5816 | } | |
5817 | ||
5818 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5819 | int err; | |
d710e138 | 5820 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5821 | if (IS_ERR(rdev)) { |
5822 | printk(KERN_WARNING | |
5823 | "md: error, md_import_device() returned %ld\n", | |
5824 | PTR_ERR(rdev)); | |
5825 | return PTR_ERR(rdev); | |
5826 | } | |
5827 | rdev->desc_nr = info->number; | |
5828 | if (info->raid_disk < mddev->raid_disks) | |
5829 | rdev->raid_disk = info->raid_disk; | |
5830 | else | |
5831 | rdev->raid_disk = -1; | |
5832 | ||
1da177e4 | 5833 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5834 | if (info->state & (1<<MD_DISK_SYNC)) |
5835 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5836 | |
8ddf9efe N |
5837 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5838 | set_bit(WriteMostly, &rdev->flags); | |
5839 | ||
1da177e4 LT |
5840 | if (!mddev->persistent) { |
5841 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5842 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5843 | } else | |
57b2caa3 | 5844 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5845 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5846 | |
2bf071bf N |
5847 | err = bind_rdev_to_array(rdev, mddev); |
5848 | if (err) { | |
5849 | export_rdev(rdev); | |
5850 | return err; | |
5851 | } | |
1da177e4 LT |
5852 | } |
5853 | ||
5854 | return 0; | |
5855 | } | |
5856 | ||
fd01b88c | 5857 | static int hot_remove_disk(struct mddev * mddev, dev_t dev) |
1da177e4 LT |
5858 | { |
5859 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 5860 | struct md_rdev *rdev; |
1da177e4 | 5861 | |
1da177e4 LT |
5862 | rdev = find_rdev(mddev, dev); |
5863 | if (!rdev) | |
5864 | return -ENXIO; | |
5865 | ||
5866 | if (rdev->raid_disk >= 0) | |
5867 | goto busy; | |
5868 | ||
5869 | kick_rdev_from_array(rdev); | |
850b2b42 | 5870 | md_update_sb(mddev, 1); |
d7603b7e | 5871 | md_new_event(mddev); |
1da177e4 LT |
5872 | |
5873 | return 0; | |
5874 | busy: | |
fdefa4d8 | 5875 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5876 | bdevname(rdev->bdev,b), mdname(mddev)); |
5877 | return -EBUSY; | |
5878 | } | |
5879 | ||
fd01b88c | 5880 | static int hot_add_disk(struct mddev * mddev, dev_t dev) |
1da177e4 LT |
5881 | { |
5882 | char b[BDEVNAME_SIZE]; | |
5883 | int err; | |
3cb03002 | 5884 | struct md_rdev *rdev; |
1da177e4 LT |
5885 | |
5886 | if (!mddev->pers) | |
5887 | return -ENODEV; | |
5888 | ||
5889 | if (mddev->major_version != 0) { | |
5890 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5891 | " version-0 superblocks.\n", | |
5892 | mdname(mddev)); | |
5893 | return -EINVAL; | |
5894 | } | |
5895 | if (!mddev->pers->hot_add_disk) { | |
5896 | printk(KERN_WARNING | |
5897 | "%s: personality does not support diskops!\n", | |
5898 | mdname(mddev)); | |
5899 | return -EINVAL; | |
5900 | } | |
5901 | ||
d710e138 | 5902 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5903 | if (IS_ERR(rdev)) { |
5904 | printk(KERN_WARNING | |
5905 | "md: error, md_import_device() returned %ld\n", | |
5906 | PTR_ERR(rdev)); | |
5907 | return -EINVAL; | |
5908 | } | |
5909 | ||
5910 | if (mddev->persistent) | |
57b2caa3 | 5911 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5912 | else |
77304d2a | 5913 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5914 | |
8190e754 | 5915 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5916 | |
b2d444d7 | 5917 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5918 | printk(KERN_WARNING |
5919 | "md: can not hot-add faulty %s disk to %s!\n", | |
5920 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5921 | err = -EINVAL; | |
5922 | goto abort_export; | |
5923 | } | |
b2d444d7 | 5924 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5925 | rdev->desc_nr = -1; |
5842730d | 5926 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5927 | err = bind_rdev_to_array(rdev, mddev); |
5928 | if (err) | |
5929 | goto abort_export; | |
1da177e4 LT |
5930 | |
5931 | /* | |
5932 | * The rest should better be atomic, we can have disk failures | |
5933 | * noticed in interrupt contexts ... | |
5934 | */ | |
5935 | ||
1da177e4 LT |
5936 | rdev->raid_disk = -1; |
5937 | ||
850b2b42 | 5938 | md_update_sb(mddev, 1); |
1da177e4 LT |
5939 | |
5940 | /* | |
5941 | * Kick recovery, maybe this spare has to be added to the | |
5942 | * array immediately. | |
5943 | */ | |
5944 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5945 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5946 | md_new_event(mddev); |
1da177e4 LT |
5947 | return 0; |
5948 | ||
1da177e4 LT |
5949 | abort_export: |
5950 | export_rdev(rdev); | |
5951 | return err; | |
5952 | } | |
5953 | ||
fd01b88c | 5954 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c N |
5955 | { |
5956 | int err; | |
5957 | ||
36fa3063 N |
5958 | if (mddev->pers) { |
5959 | if (!mddev->pers->quiesce) | |
5960 | return -EBUSY; | |
5961 | if (mddev->recovery || mddev->sync_thread) | |
5962 | return -EBUSY; | |
5963 | /* we should be able to change the bitmap.. */ | |
5964 | } | |
32a7627c | 5965 | |
32a7627c | 5966 | |
36fa3063 N |
5967 | if (fd >= 0) { |
5968 | if (mddev->bitmap) | |
5969 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5970 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5971 | |
c3d9714e | 5972 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5973 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5974 | mdname(mddev)); | |
5975 | return -EBADF; | |
5976 | } | |
5977 | ||
c3d9714e | 5978 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5979 | if (err) { |
5980 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5981 | mdname(mddev)); | |
c3d9714e N |
5982 | fput(mddev->bitmap_info.file); |
5983 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5984 | return err; |
5985 | } | |
c3d9714e | 5986 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5987 | } else if (mddev->bitmap == NULL) |
5988 | return -ENOENT; /* cannot remove what isn't there */ | |
5989 | err = 0; | |
5990 | if (mddev->pers) { | |
5991 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5992 | if (fd >= 0) { |
36fa3063 | 5993 | err = bitmap_create(mddev); |
69e51b44 N |
5994 | if (!err) |
5995 | err = bitmap_load(mddev); | |
5996 | } | |
d7375ab3 | 5997 | if (fd < 0 || err) { |
36fa3063 | 5998 | bitmap_destroy(mddev); |
d7375ab3 N |
5999 | fd = -1; /* make sure to put the file */ |
6000 | } | |
36fa3063 | 6001 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
6002 | } |
6003 | if (fd < 0) { | |
c3d9714e N |
6004 | if (mddev->bitmap_info.file) { |
6005 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
6006 | fput(mddev->bitmap_info.file); | |
acc55e22 | 6007 | } |
c3d9714e | 6008 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
6009 | } |
6010 | ||
32a7627c N |
6011 | return err; |
6012 | } | |
6013 | ||
1da177e4 LT |
6014 | /* |
6015 | * set_array_info is used two different ways | |
6016 | * The original usage is when creating a new array. | |
6017 | * In this usage, raid_disks is > 0 and it together with | |
6018 | * level, size, not_persistent,layout,chunksize determine the | |
6019 | * shape of the array. | |
6020 | * This will always create an array with a type-0.90.0 superblock. | |
6021 | * The newer usage is when assembling an array. | |
6022 | * In this case raid_disks will be 0, and the major_version field is | |
6023 | * use to determine which style super-blocks are to be found on the devices. | |
6024 | * The minor and patch _version numbers are also kept incase the | |
6025 | * super_block handler wishes to interpret them. | |
6026 | */ | |
fd01b88c | 6027 | static int set_array_info(struct mddev * mddev, mdu_array_info_t *info) |
1da177e4 LT |
6028 | { |
6029 | ||
6030 | if (info->raid_disks == 0) { | |
6031 | /* just setting version number for superblock loading */ | |
6032 | if (info->major_version < 0 || | |
50511da3 | 6033 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
6034 | super_types[info->major_version].name == NULL) { |
6035 | /* maybe try to auto-load a module? */ | |
6036 | printk(KERN_INFO | |
6037 | "md: superblock version %d not known\n", | |
6038 | info->major_version); | |
6039 | return -EINVAL; | |
6040 | } | |
6041 | mddev->major_version = info->major_version; | |
6042 | mddev->minor_version = info->minor_version; | |
6043 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 6044 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
6045 | /* ensure mddev_put doesn't delete this now that there |
6046 | * is some minimal configuration. | |
6047 | */ | |
6048 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
6049 | return 0; |
6050 | } | |
6051 | mddev->major_version = MD_MAJOR_VERSION; | |
6052 | mddev->minor_version = MD_MINOR_VERSION; | |
6053 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
6054 | mddev->ctime = get_seconds(); | |
6055 | ||
6056 | mddev->level = info->level; | |
17115e03 | 6057 | mddev->clevel[0] = 0; |
58c0fed4 | 6058 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
6059 | mddev->raid_disks = info->raid_disks; |
6060 | /* don't set md_minor, it is determined by which /dev/md* was | |
6061 | * openned | |
6062 | */ | |
6063 | if (info->state & (1<<MD_SB_CLEAN)) | |
6064 | mddev->recovery_cp = MaxSector; | |
6065 | else | |
6066 | mddev->recovery_cp = 0; | |
6067 | mddev->persistent = ! info->not_persistent; | |
e691063a | 6068 | mddev->external = 0; |
1da177e4 LT |
6069 | |
6070 | mddev->layout = info->layout; | |
9d8f0363 | 6071 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
6072 | |
6073 | mddev->max_disks = MD_SB_DISKS; | |
6074 | ||
e691063a N |
6075 | if (mddev->persistent) |
6076 | mddev->flags = 0; | |
850b2b42 | 6077 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6078 | |
c3d9714e N |
6079 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
6080 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 6081 | |
f6705578 N |
6082 | mddev->reshape_position = MaxSector; |
6083 | ||
1da177e4 LT |
6084 | /* |
6085 | * Generate a 128 bit UUID | |
6086 | */ | |
6087 | get_random_bytes(mddev->uuid, 16); | |
6088 | ||
f6705578 | 6089 | mddev->new_level = mddev->level; |
664e7c41 | 6090 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
6091 | mddev->new_layout = mddev->layout; |
6092 | mddev->delta_disks = 0; | |
2c810cdd | 6093 | mddev->reshape_backwards = 0; |
f6705578 | 6094 | |
1da177e4 LT |
6095 | return 0; |
6096 | } | |
6097 | ||
fd01b88c | 6098 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 6099 | { |
b522adcd DW |
6100 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
6101 | ||
6102 | if (mddev->external_size) | |
6103 | return; | |
6104 | ||
1f403624 DW |
6105 | mddev->array_sectors = array_sectors; |
6106 | } | |
6107 | EXPORT_SYMBOL(md_set_array_sectors); | |
6108 | ||
fd01b88c | 6109 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 6110 | { |
3cb03002 | 6111 | struct md_rdev *rdev; |
a35b0d69 | 6112 | int rv; |
d71f9f88 | 6113 | int fit = (num_sectors == 0); |
a35b0d69 N |
6114 | |
6115 | if (mddev->pers->resize == NULL) | |
6116 | return -EINVAL; | |
d71f9f88 AN |
6117 | /* The "num_sectors" is the number of sectors of each device that |
6118 | * is used. This can only make sense for arrays with redundancy. | |
6119 | * linear and raid0 always use whatever space is available. We can only | |
6120 | * consider changing this number if no resync or reconstruction is | |
6121 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 6122 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
6123 | * of each device. If num_sectors is zero, we find the largest size |
6124 | * that fits. | |
a35b0d69 N |
6125 | */ |
6126 | if (mddev->sync_thread) | |
6127 | return -EBUSY; | |
dba034ee N |
6128 | if (mddev->bitmap) |
6129 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
6130 | * grow, and re-add. | |
6131 | */ | |
6132 | return -EBUSY; | |
dafb20fa | 6133 | rdev_for_each(rdev, mddev) { |
dd8ac336 | 6134 | sector_t avail = rdev->sectors; |
01ab5662 | 6135 | |
d71f9f88 AN |
6136 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
6137 | num_sectors = avail; | |
6138 | if (avail < num_sectors) | |
a35b0d69 N |
6139 | return -ENOSPC; |
6140 | } | |
d71f9f88 | 6141 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
6142 | if (!rv) |
6143 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
6144 | return rv; |
6145 | } | |
6146 | ||
fd01b88c | 6147 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
6148 | { |
6149 | int rv; | |
c6563a8c | 6150 | struct md_rdev *rdev; |
da943b99 | 6151 | /* change the number of raid disks */ |
63c70c4f | 6152 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
6153 | return -EINVAL; |
6154 | if (raid_disks <= 0 || | |
233fca36 | 6155 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 6156 | return -EINVAL; |
63c70c4f | 6157 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 6158 | return -EBUSY; |
c6563a8c N |
6159 | |
6160 | rdev_for_each(rdev, mddev) { | |
6161 | if (mddev->raid_disks < raid_disks && | |
6162 | rdev->data_offset < rdev->new_data_offset) | |
6163 | return -EINVAL; | |
6164 | if (mddev->raid_disks > raid_disks && | |
6165 | rdev->data_offset > rdev->new_data_offset) | |
6166 | return -EINVAL; | |
6167 | } | |
6168 | ||
63c70c4f | 6169 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
2c810cdd N |
6170 | if (mddev->delta_disks < 0) |
6171 | mddev->reshape_backwards = 1; | |
6172 | else if (mddev->delta_disks > 0) | |
6173 | mddev->reshape_backwards = 0; | |
63c70c4f N |
6174 | |
6175 | rv = mddev->pers->check_reshape(mddev); | |
2c810cdd | 6176 | if (rv < 0) { |
de171cb9 | 6177 | mddev->delta_disks = 0; |
2c810cdd N |
6178 | mddev->reshape_backwards = 0; |
6179 | } | |
da943b99 N |
6180 | return rv; |
6181 | } | |
6182 | ||
6183 | ||
1da177e4 LT |
6184 | /* |
6185 | * update_array_info is used to change the configuration of an | |
6186 | * on-line array. | |
6187 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
6188 | * fields in the info are checked against the array. | |
6189 | * Any differences that cannot be handled will cause an error. | |
6190 | * Normally, only one change can be managed at a time. | |
6191 | */ | |
fd01b88c | 6192 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
6193 | { |
6194 | int rv = 0; | |
6195 | int cnt = 0; | |
36fa3063 N |
6196 | int state = 0; |
6197 | ||
6198 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 6199 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 6200 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
6201 | |
6202 | if (mddev->major_version != info->major_version || | |
6203 | mddev->minor_version != info->minor_version || | |
6204 | /* mddev->patch_version != info->patch_version || */ | |
6205 | mddev->ctime != info->ctime || | |
6206 | mddev->level != info->level || | |
6207 | /* mddev->layout != info->layout || */ | |
6208 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 6209 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
6210 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
6211 | ((state^info->state) & 0xfffffe00) | |
6212 | ) | |
1da177e4 LT |
6213 | return -EINVAL; |
6214 | /* Check there is only one change */ | |
58c0fed4 AN |
6215 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
6216 | cnt++; | |
6217 | if (mddev->raid_disks != info->raid_disks) | |
6218 | cnt++; | |
6219 | if (mddev->layout != info->layout) | |
6220 | cnt++; | |
6221 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
6222 | cnt++; | |
6223 | if (cnt == 0) | |
6224 | return 0; | |
6225 | if (cnt > 1) | |
6226 | return -EINVAL; | |
1da177e4 LT |
6227 | |
6228 | if (mddev->layout != info->layout) { | |
6229 | /* Change layout | |
6230 | * we don't need to do anything at the md level, the | |
6231 | * personality will take care of it all. | |
6232 | */ | |
50ac168a | 6233 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6234 | return -EINVAL; |
597a711b N |
6235 | else { |
6236 | mddev->new_layout = info->layout; | |
50ac168a | 6237 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6238 | if (rv) |
6239 | mddev->new_layout = mddev->layout; | |
6240 | return rv; | |
6241 | } | |
1da177e4 | 6242 | } |
58c0fed4 | 6243 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6244 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6245 | |
da943b99 N |
6246 | if (mddev->raid_disks != info->raid_disks) |
6247 | rv = update_raid_disks(mddev, info->raid_disks); | |
6248 | ||
36fa3063 N |
6249 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
6250 | if (mddev->pers->quiesce == NULL) | |
6251 | return -EINVAL; | |
6252 | if (mddev->recovery || mddev->sync_thread) | |
6253 | return -EBUSY; | |
6254 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
6255 | /* add the bitmap */ | |
6256 | if (mddev->bitmap) | |
6257 | return -EEXIST; | |
c3d9714e | 6258 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 6259 | return -EINVAL; |
c3d9714e N |
6260 | mddev->bitmap_info.offset = |
6261 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
6262 | mddev->pers->quiesce(mddev, 1); |
6263 | rv = bitmap_create(mddev); | |
69e51b44 N |
6264 | if (!rv) |
6265 | rv = bitmap_load(mddev); | |
36fa3063 N |
6266 | if (rv) |
6267 | bitmap_destroy(mddev); | |
6268 | mddev->pers->quiesce(mddev, 0); | |
6269 | } else { | |
6270 | /* remove the bitmap */ | |
6271 | if (!mddev->bitmap) | |
6272 | return -ENOENT; | |
6273 | if (mddev->bitmap->file) | |
6274 | return -EINVAL; | |
6275 | mddev->pers->quiesce(mddev, 1); | |
6276 | bitmap_destroy(mddev); | |
6277 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6278 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6279 | } |
6280 | } | |
850b2b42 | 6281 | md_update_sb(mddev, 1); |
1da177e4 LT |
6282 | return rv; |
6283 | } | |
6284 | ||
fd01b88c | 6285 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6286 | { |
3cb03002 | 6287 | struct md_rdev *rdev; |
1da177e4 LT |
6288 | |
6289 | if (mddev->pers == NULL) | |
6290 | return -ENODEV; | |
6291 | ||
6292 | rdev = find_rdev(mddev, dev); | |
6293 | if (!rdev) | |
6294 | return -ENODEV; | |
6295 | ||
6296 | md_error(mddev, rdev); | |
5ef56c8f N |
6297 | if (!test_bit(Faulty, &rdev->flags)) |
6298 | return -EBUSY; | |
1da177e4 LT |
6299 | return 0; |
6300 | } | |
6301 | ||
2f9618ce AN |
6302 | /* |
6303 | * We have a problem here : there is no easy way to give a CHS | |
6304 | * virtual geometry. We currently pretend that we have a 2 heads | |
6305 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6306 | * dosfs just mad... ;-) | |
6307 | */ | |
a885c8c4 CH |
6308 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6309 | { | |
fd01b88c | 6310 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6311 | |
6312 | geo->heads = 2; | |
6313 | geo->sectors = 4; | |
49ce6cea | 6314 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6315 | return 0; |
6316 | } | |
6317 | ||
a39907fa | 6318 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6319 | unsigned int cmd, unsigned long arg) |
6320 | { | |
6321 | int err = 0; | |
6322 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6323 | struct mddev *mddev = NULL; |
e2218350 | 6324 | int ro; |
1da177e4 | 6325 | |
506c9e44 N |
6326 | switch (cmd) { |
6327 | case RAID_VERSION: | |
6328 | case GET_ARRAY_INFO: | |
6329 | case GET_DISK_INFO: | |
6330 | break; | |
6331 | default: | |
6332 | if (!capable(CAP_SYS_ADMIN)) | |
6333 | return -EACCES; | |
6334 | } | |
1da177e4 LT |
6335 | |
6336 | /* | |
6337 | * Commands dealing with the RAID driver but not any | |
6338 | * particular array: | |
6339 | */ | |
6340 | switch (cmd) | |
6341 | { | |
6342 | case RAID_VERSION: | |
6343 | err = get_version(argp); | |
6344 | goto done; | |
6345 | ||
6346 | case PRINT_RAID_DEBUG: | |
6347 | err = 0; | |
6348 | md_print_devices(); | |
6349 | goto done; | |
6350 | ||
6351 | #ifndef MODULE | |
6352 | case RAID_AUTORUN: | |
6353 | err = 0; | |
6354 | autostart_arrays(arg); | |
6355 | goto done; | |
6356 | #endif | |
6357 | default:; | |
6358 | } | |
6359 | ||
6360 | /* | |
6361 | * Commands creating/starting a new array: | |
6362 | */ | |
6363 | ||
a39907fa | 6364 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6365 | |
6366 | if (!mddev) { | |
6367 | BUG(); | |
6368 | goto abort; | |
6369 | } | |
6370 | ||
1da177e4 LT |
6371 | err = mddev_lock(mddev); |
6372 | if (err) { | |
6373 | printk(KERN_INFO | |
6374 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
6375 | err, cmd); | |
6376 | goto abort; | |
6377 | } | |
6378 | ||
6379 | switch (cmd) | |
6380 | { | |
6381 | case SET_ARRAY_INFO: | |
6382 | { | |
6383 | mdu_array_info_t info; | |
6384 | if (!arg) | |
6385 | memset(&info, 0, sizeof(info)); | |
6386 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6387 | err = -EFAULT; | |
6388 | goto abort_unlock; | |
6389 | } | |
6390 | if (mddev->pers) { | |
6391 | err = update_array_info(mddev, &info); | |
6392 | if (err) { | |
6393 | printk(KERN_WARNING "md: couldn't update" | |
6394 | " array info. %d\n", err); | |
6395 | goto abort_unlock; | |
6396 | } | |
6397 | goto done_unlock; | |
6398 | } | |
6399 | if (!list_empty(&mddev->disks)) { | |
6400 | printk(KERN_WARNING | |
6401 | "md: array %s already has disks!\n", | |
6402 | mdname(mddev)); | |
6403 | err = -EBUSY; | |
6404 | goto abort_unlock; | |
6405 | } | |
6406 | if (mddev->raid_disks) { | |
6407 | printk(KERN_WARNING | |
6408 | "md: array %s already initialised!\n", | |
6409 | mdname(mddev)); | |
6410 | err = -EBUSY; | |
6411 | goto abort_unlock; | |
6412 | } | |
6413 | err = set_array_info(mddev, &info); | |
6414 | if (err) { | |
6415 | printk(KERN_WARNING "md: couldn't set" | |
6416 | " array info. %d\n", err); | |
6417 | goto abort_unlock; | |
6418 | } | |
6419 | } | |
6420 | goto done_unlock; | |
6421 | ||
6422 | default:; | |
6423 | } | |
6424 | ||
6425 | /* | |
6426 | * Commands querying/configuring an existing array: | |
6427 | */ | |
32a7627c | 6428 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6429 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6430 | if ((!mddev->raid_disks && !mddev->external) |
6431 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6432 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6433 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
6434 | err = -ENODEV; |
6435 | goto abort_unlock; | |
6436 | } | |
6437 | ||
6438 | /* | |
6439 | * Commands even a read-only array can execute: | |
6440 | */ | |
6441 | switch (cmd) | |
6442 | { | |
6443 | case GET_ARRAY_INFO: | |
6444 | err = get_array_info(mddev, argp); | |
6445 | goto done_unlock; | |
6446 | ||
32a7627c | 6447 | case GET_BITMAP_FILE: |
87162a28 | 6448 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
6449 | goto done_unlock; |
6450 | ||
1da177e4 LT |
6451 | case GET_DISK_INFO: |
6452 | err = get_disk_info(mddev, argp); | |
6453 | goto done_unlock; | |
6454 | ||
6455 | case RESTART_ARRAY_RW: | |
6456 | err = restart_array(mddev); | |
6457 | goto done_unlock; | |
6458 | ||
6459 | case STOP_ARRAY: | |
d710e138 | 6460 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
6461 | goto done_unlock; |
6462 | ||
6463 | case STOP_ARRAY_RO: | |
a4bd82d0 | 6464 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
6465 | goto done_unlock; |
6466 | ||
e2218350 DW |
6467 | case BLKROSET: |
6468 | if (get_user(ro, (int __user *)(arg))) { | |
6469 | err = -EFAULT; | |
6470 | goto done_unlock; | |
6471 | } | |
6472 | err = -EINVAL; | |
6473 | ||
6474 | /* if the bdev is going readonly the value of mddev->ro | |
6475 | * does not matter, no writes are coming | |
6476 | */ | |
6477 | if (ro) | |
6478 | goto done_unlock; | |
6479 | ||
6480 | /* are we are already prepared for writes? */ | |
6481 | if (mddev->ro != 1) | |
6482 | goto done_unlock; | |
6483 | ||
6484 | /* transitioning to readauto need only happen for | |
6485 | * arrays that call md_write_start | |
6486 | */ | |
6487 | if (mddev->pers) { | |
6488 | err = restart_array(mddev); | |
6489 | if (err == 0) { | |
6490 | mddev->ro = 2; | |
6491 | set_disk_ro(mddev->gendisk, 0); | |
6492 | } | |
6493 | } | |
6494 | goto done_unlock; | |
1da177e4 LT |
6495 | } |
6496 | ||
6497 | /* | |
6498 | * The remaining ioctls are changing the state of the | |
f91de92e N |
6499 | * superblock, so we do not allow them on read-only arrays. |
6500 | * However non-MD ioctls (e.g. get-size) will still come through | |
6501 | * here and hit the 'default' below, so only disallow | |
6502 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 6503 | */ |
bb57fc64 | 6504 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
6505 | if (mddev->ro == 2) { |
6506 | mddev->ro = 0; | |
00bcb4ac | 6507 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
6508 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
6509 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
6510 | } else { |
6511 | err = -EROFS; | |
6512 | goto abort_unlock; | |
6513 | } | |
1da177e4 LT |
6514 | } |
6515 | ||
6516 | switch (cmd) | |
6517 | { | |
6518 | case ADD_NEW_DISK: | |
6519 | { | |
6520 | mdu_disk_info_t info; | |
6521 | if (copy_from_user(&info, argp, sizeof(info))) | |
6522 | err = -EFAULT; | |
6523 | else | |
6524 | err = add_new_disk(mddev, &info); | |
6525 | goto done_unlock; | |
6526 | } | |
6527 | ||
6528 | case HOT_REMOVE_DISK: | |
6529 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
6530 | goto done_unlock; | |
6531 | ||
6532 | case HOT_ADD_DISK: | |
6533 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
6534 | goto done_unlock; | |
6535 | ||
6536 | case SET_DISK_FAULTY: | |
6537 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
6538 | goto done_unlock; | |
6539 | ||
6540 | case RUN_ARRAY: | |
d710e138 | 6541 | err = do_md_run(mddev); |
1da177e4 LT |
6542 | goto done_unlock; |
6543 | ||
32a7627c N |
6544 | case SET_BITMAP_FILE: |
6545 | err = set_bitmap_file(mddev, (int)arg); | |
6546 | goto done_unlock; | |
6547 | ||
1da177e4 | 6548 | default: |
1da177e4 LT |
6549 | err = -EINVAL; |
6550 | goto abort_unlock; | |
6551 | } | |
6552 | ||
6553 | done_unlock: | |
6554 | abort_unlock: | |
d3374825 N |
6555 | if (mddev->hold_active == UNTIL_IOCTL && |
6556 | err != -EINVAL) | |
6557 | mddev->hold_active = 0; | |
1da177e4 LT |
6558 | mddev_unlock(mddev); |
6559 | ||
6560 | return err; | |
6561 | done: | |
6562 | if (err) | |
6563 | MD_BUG(); | |
6564 | abort: | |
6565 | return err; | |
6566 | } | |
aa98aa31 AB |
6567 | #ifdef CONFIG_COMPAT |
6568 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6569 | unsigned int cmd, unsigned long arg) | |
6570 | { | |
6571 | switch (cmd) { | |
6572 | case HOT_REMOVE_DISK: | |
6573 | case HOT_ADD_DISK: | |
6574 | case SET_DISK_FAULTY: | |
6575 | case SET_BITMAP_FILE: | |
6576 | /* These take in integer arg, do not convert */ | |
6577 | break; | |
6578 | default: | |
6579 | arg = (unsigned long)compat_ptr(arg); | |
6580 | break; | |
6581 | } | |
6582 | ||
6583 | return md_ioctl(bdev, mode, cmd, arg); | |
6584 | } | |
6585 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6586 | |
a39907fa | 6587 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6588 | { |
6589 | /* | |
6590 | * Succeed if we can lock the mddev, which confirms that | |
6591 | * it isn't being stopped right now. | |
6592 | */ | |
fd01b88c | 6593 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6594 | int err; |
6595 | ||
d3374825 N |
6596 | if (mddev->gendisk != bdev->bd_disk) { |
6597 | /* we are racing with mddev_put which is discarding this | |
6598 | * bd_disk. | |
6599 | */ | |
6600 | mddev_put(mddev); | |
6601 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6602 | flush_workqueue(md_misc_wq); |
d3374825 N |
6603 | /* Then retry the open from the top */ |
6604 | return -ERESTARTSYS; | |
6605 | } | |
6606 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6607 | ||
c8c00a69 | 6608 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6609 | goto out; |
6610 | ||
6611 | err = 0; | |
f2ea68cf | 6612 | atomic_inc(&mddev->openers); |
c8c00a69 | 6613 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6614 | |
f0b4f7e2 | 6615 | check_disk_change(bdev); |
1da177e4 LT |
6616 | out: |
6617 | return err; | |
6618 | } | |
6619 | ||
a39907fa | 6620 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6621 | { |
fd01b88c | 6622 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6623 | |
52e5f9d1 | 6624 | BUG_ON(!mddev); |
f2ea68cf | 6625 | atomic_dec(&mddev->openers); |
1da177e4 LT |
6626 | mddev_put(mddev); |
6627 | ||
6628 | return 0; | |
6629 | } | |
f0b4f7e2 N |
6630 | |
6631 | static int md_media_changed(struct gendisk *disk) | |
6632 | { | |
fd01b88c | 6633 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6634 | |
6635 | return mddev->changed; | |
6636 | } | |
6637 | ||
6638 | static int md_revalidate(struct gendisk *disk) | |
6639 | { | |
fd01b88c | 6640 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6641 | |
6642 | mddev->changed = 0; | |
6643 | return 0; | |
6644 | } | |
83d5cde4 | 6645 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6646 | { |
6647 | .owner = THIS_MODULE, | |
a39907fa AV |
6648 | .open = md_open, |
6649 | .release = md_release, | |
b492b852 | 6650 | .ioctl = md_ioctl, |
aa98aa31 AB |
6651 | #ifdef CONFIG_COMPAT |
6652 | .compat_ioctl = md_compat_ioctl, | |
6653 | #endif | |
a885c8c4 | 6654 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6655 | .media_changed = md_media_changed, |
6656 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6657 | }; |
6658 | ||
75c96f85 | 6659 | static int md_thread(void * arg) |
1da177e4 | 6660 | { |
2b8bf345 | 6661 | struct md_thread *thread = arg; |
1da177e4 | 6662 | |
1da177e4 LT |
6663 | /* |
6664 | * md_thread is a 'system-thread', it's priority should be very | |
6665 | * high. We avoid resource deadlocks individually in each | |
6666 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6667 | * the very same RT priority as kswapd, thus we will never get | |
6668 | * into a priority inversion deadlock. | |
6669 | * | |
6670 | * we definitely have to have equal or higher priority than | |
6671 | * bdflush, otherwise bdflush will deadlock if there are too | |
6672 | * many dirty RAID5 blocks. | |
6673 | */ | |
1da177e4 | 6674 | |
6985c43f | 6675 | allow_signal(SIGKILL); |
a6fb0934 | 6676 | while (!kthread_should_stop()) { |
1da177e4 | 6677 | |
93588e22 N |
6678 | /* We need to wait INTERRUPTIBLE so that |
6679 | * we don't add to the load-average. | |
6680 | * That means we need to be sure no signals are | |
6681 | * pending | |
6682 | */ | |
6683 | if (signal_pending(current)) | |
6684 | flush_signals(current); | |
6685 | ||
6686 | wait_event_interruptible_timeout | |
6687 | (thread->wqueue, | |
6688 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6689 | || kthread_should_stop(), | |
6690 | thread->timeout); | |
1da177e4 | 6691 | |
6c987910 N |
6692 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6693 | if (!kthread_should_stop()) | |
589a594b | 6694 | thread->run(thread->mddev); |
1da177e4 | 6695 | } |
a6fb0934 | 6696 | |
1da177e4 LT |
6697 | return 0; |
6698 | } | |
6699 | ||
2b8bf345 | 6700 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
6701 | { |
6702 | if (thread) { | |
36a4e1fe | 6703 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
6704 | set_bit(THREAD_WAKEUP, &thread->flags); |
6705 | wake_up(&thread->wqueue); | |
6706 | } | |
6707 | } | |
6708 | ||
2b8bf345 | 6709 | struct md_thread *md_register_thread(void (*run) (struct mddev *), struct mddev *mddev, |
1da177e4 LT |
6710 | const char *name) |
6711 | { | |
2b8bf345 | 6712 | struct md_thread *thread; |
1da177e4 | 6713 | |
2b8bf345 | 6714 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
6715 | if (!thread) |
6716 | return NULL; | |
6717 | ||
1da177e4 LT |
6718 | init_waitqueue_head(&thread->wqueue); |
6719 | ||
1da177e4 LT |
6720 | thread->run = run; |
6721 | thread->mddev = mddev; | |
32a7627c | 6722 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6723 | thread->tsk = kthread_run(md_thread, thread, |
6724 | "%s_%s", | |
6725 | mdname(thread->mddev), | |
6726 | name ?: mddev->pers->name); | |
a6fb0934 | 6727 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6728 | kfree(thread); |
6729 | return NULL; | |
6730 | } | |
1da177e4 LT |
6731 | return thread; |
6732 | } | |
6733 | ||
2b8bf345 | 6734 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 6735 | { |
2b8bf345 | 6736 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
6737 | if (!thread) |
6738 | return; | |
36a4e1fe | 6739 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
6740 | /* Locking ensures that mddev_unlock does not wake_up a |
6741 | * non-existent thread | |
6742 | */ | |
6743 | spin_lock(&pers_lock); | |
6744 | *threadp = NULL; | |
6745 | spin_unlock(&pers_lock); | |
a6fb0934 N |
6746 | |
6747 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6748 | kfree(thread); |
6749 | } | |
6750 | ||
fd01b88c | 6751 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
6752 | { |
6753 | if (!mddev) { | |
6754 | MD_BUG(); | |
6755 | return; | |
6756 | } | |
6757 | ||
b2d444d7 | 6758 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6759 | return; |
6bfe0b49 | 6760 | |
de393cde | 6761 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
6762 | return; |
6763 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6764 | if (mddev->degraded) |
6765 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6766 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6767 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6768 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6769 | md_wakeup_thread(mddev->thread); | |
768a418d | 6770 | if (mddev->event_work.func) |
e804ac78 | 6771 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6772 | md_new_event_inintr(mddev); |
1da177e4 LT |
6773 | } |
6774 | ||
6775 | /* seq_file implementation /proc/mdstat */ | |
6776 | ||
6777 | static void status_unused(struct seq_file *seq) | |
6778 | { | |
6779 | int i = 0; | |
3cb03002 | 6780 | struct md_rdev *rdev; |
1da177e4 LT |
6781 | |
6782 | seq_printf(seq, "unused devices: "); | |
6783 | ||
159ec1fc | 6784 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6785 | char b[BDEVNAME_SIZE]; |
6786 | i++; | |
6787 | seq_printf(seq, "%s ", | |
6788 | bdevname(rdev->bdev,b)); | |
6789 | } | |
6790 | if (!i) | |
6791 | seq_printf(seq, "<none>"); | |
6792 | ||
6793 | seq_printf(seq, "\n"); | |
6794 | } | |
6795 | ||
6796 | ||
fd01b88c | 6797 | static void status_resync(struct seq_file *seq, struct mddev * mddev) |
1da177e4 | 6798 | { |
dd71cf6b N |
6799 | sector_t max_sectors, resync, res; |
6800 | unsigned long dt, db; | |
6801 | sector_t rt; | |
4588b42e N |
6802 | int scale; |
6803 | unsigned int per_milli; | |
1da177e4 | 6804 | |
dd71cf6b | 6805 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 | 6806 | |
c804cdec N |
6807 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) || |
6808 | test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
dd71cf6b | 6809 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6810 | else |
dd71cf6b | 6811 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6812 | |
6813 | /* | |
6814 | * Should not happen. | |
6815 | */ | |
dd71cf6b | 6816 | if (!max_sectors) { |
1da177e4 LT |
6817 | MD_BUG(); |
6818 | return; | |
6819 | } | |
4588b42e | 6820 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6821 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6822 | * u32, as those are the requirements for sector_div. |
6823 | * Thus 'scale' must be at least 10 | |
6824 | */ | |
6825 | scale = 10; | |
6826 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6827 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6828 | scale++; |
6829 | } | |
6830 | res = (resync>>scale)*1000; | |
dd71cf6b | 6831 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6832 | |
6833 | per_milli = res; | |
1da177e4 | 6834 | { |
4588b42e | 6835 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6836 | seq_printf(seq, "["); |
6837 | for (i = 0; i < x; i++) | |
6838 | seq_printf(seq, "="); | |
6839 | seq_printf(seq, ">"); | |
6840 | for (i = 0; i < y; i++) | |
6841 | seq_printf(seq, "."); | |
6842 | seq_printf(seq, "] "); | |
6843 | } | |
4588b42e | 6844 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6845 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6846 | "reshape" : | |
61df9d91 N |
6847 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6848 | "check" : | |
6849 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6850 | "resync" : "recovery"))), | |
6851 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6852 | (unsigned long long) resync/2, |
6853 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6854 | |
6855 | /* | |
1da177e4 LT |
6856 | * dt: time from mark until now |
6857 | * db: blocks written from mark until now | |
6858 | * rt: remaining time | |
dd71cf6b N |
6859 | * |
6860 | * rt is a sector_t, so could be 32bit or 64bit. | |
6861 | * So we divide before multiply in case it is 32bit and close | |
6862 | * to the limit. | |
25985edc | 6863 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6864 | * near the end of resync when the number of remaining sectors |
6865 | * is close to 'db'. | |
6866 | * We then divide rt by 32 after multiplying by db to compensate. | |
6867 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6868 | */ |
6869 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6870 | if (!dt) dt++; | |
ff4e8d9a N |
6871 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6872 | - mddev->resync_mark_cnt; | |
1da177e4 | 6873 | |
dd71cf6b N |
6874 | rt = max_sectors - resync; /* number of remaining sectors */ |
6875 | sector_div(rt, db/32+1); | |
6876 | rt *= dt; | |
6877 | rt >>= 5; | |
6878 | ||
6879 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6880 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6881 | |
ff4e8d9a | 6882 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6883 | } |
6884 | ||
6885 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6886 | { | |
6887 | struct list_head *tmp; | |
6888 | loff_t l = *pos; | |
fd01b88c | 6889 | struct mddev *mddev; |
1da177e4 LT |
6890 | |
6891 | if (l >= 0x10000) | |
6892 | return NULL; | |
6893 | if (!l--) | |
6894 | /* header */ | |
6895 | return (void*)1; | |
6896 | ||
6897 | spin_lock(&all_mddevs_lock); | |
6898 | list_for_each(tmp,&all_mddevs) | |
6899 | if (!l--) { | |
fd01b88c | 6900 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
6901 | mddev_get(mddev); |
6902 | spin_unlock(&all_mddevs_lock); | |
6903 | return mddev; | |
6904 | } | |
6905 | spin_unlock(&all_mddevs_lock); | |
6906 | if (!l--) | |
6907 | return (void*)2;/* tail */ | |
6908 | return NULL; | |
6909 | } | |
6910 | ||
6911 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6912 | { | |
6913 | struct list_head *tmp; | |
fd01b88c | 6914 | struct mddev *next_mddev, *mddev = v; |
1da177e4 LT |
6915 | |
6916 | ++*pos; | |
6917 | if (v == (void*)2) | |
6918 | return NULL; | |
6919 | ||
6920 | spin_lock(&all_mddevs_lock); | |
6921 | if (v == (void*)1) | |
6922 | tmp = all_mddevs.next; | |
6923 | else | |
6924 | tmp = mddev->all_mddevs.next; | |
6925 | if (tmp != &all_mddevs) | |
fd01b88c | 6926 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
6927 | else { |
6928 | next_mddev = (void*)2; | |
6929 | *pos = 0x10000; | |
6930 | } | |
6931 | spin_unlock(&all_mddevs_lock); | |
6932 | ||
6933 | if (v != (void*)1) | |
6934 | mddev_put(mddev); | |
6935 | return next_mddev; | |
6936 | ||
6937 | } | |
6938 | ||
6939 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6940 | { | |
fd01b88c | 6941 | struct mddev *mddev = v; |
1da177e4 LT |
6942 | |
6943 | if (mddev && v != (void*)1 && v != (void*)2) | |
6944 | mddev_put(mddev); | |
6945 | } | |
6946 | ||
6947 | static int md_seq_show(struct seq_file *seq, void *v) | |
6948 | { | |
fd01b88c | 6949 | struct mddev *mddev = v; |
dd8ac336 | 6950 | sector_t sectors; |
3cb03002 | 6951 | struct md_rdev *rdev; |
1da177e4 LT |
6952 | |
6953 | if (v == (void*)1) { | |
84fc4b56 | 6954 | struct md_personality *pers; |
1da177e4 LT |
6955 | seq_printf(seq, "Personalities : "); |
6956 | spin_lock(&pers_lock); | |
2604b703 N |
6957 | list_for_each_entry(pers, &pers_list, list) |
6958 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6959 | |
6960 | spin_unlock(&pers_lock); | |
6961 | seq_printf(seq, "\n"); | |
f1514638 | 6962 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
6963 | return 0; |
6964 | } | |
6965 | if (v == (void*)2) { | |
6966 | status_unused(seq); | |
6967 | return 0; | |
6968 | } | |
6969 | ||
5dc5cf7d | 6970 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6971 | return -EINTR; |
5dc5cf7d | 6972 | |
1da177e4 LT |
6973 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6974 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6975 | mddev->pers ? "" : "in"); | |
6976 | if (mddev->pers) { | |
f91de92e | 6977 | if (mddev->ro==1) |
1da177e4 | 6978 | seq_printf(seq, " (read-only)"); |
f91de92e | 6979 | if (mddev->ro==2) |
52720ae7 | 6980 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6981 | seq_printf(seq, " %s", mddev->pers->name); |
6982 | } | |
6983 | ||
dd8ac336 | 6984 | sectors = 0; |
dafb20fa | 6985 | rdev_for_each(rdev, mddev) { |
1da177e4 LT |
6986 | char b[BDEVNAME_SIZE]; |
6987 | seq_printf(seq, " %s[%d]", | |
6988 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6989 | if (test_bit(WriteMostly, &rdev->flags)) |
6990 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6991 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6992 | seq_printf(seq, "(F)"); |
6993 | continue; | |
2d78f8c4 N |
6994 | } |
6995 | if (rdev->raid_disk < 0) | |
b325a32e | 6996 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
6997 | if (test_bit(Replacement, &rdev->flags)) |
6998 | seq_printf(seq, "(R)"); | |
dd8ac336 | 6999 | sectors += rdev->sectors; |
1da177e4 LT |
7000 | } |
7001 | ||
7002 | if (!list_empty(&mddev->disks)) { | |
7003 | if (mddev->pers) | |
7004 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
7005 | (unsigned long long) |
7006 | mddev->array_sectors / 2); | |
1da177e4 LT |
7007 | else |
7008 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 7009 | (unsigned long long)sectors / 2); |
1da177e4 | 7010 | } |
1cd6bf19 N |
7011 | if (mddev->persistent) { |
7012 | if (mddev->major_version != 0 || | |
7013 | mddev->minor_version != 90) { | |
7014 | seq_printf(seq," super %d.%d", | |
7015 | mddev->major_version, | |
7016 | mddev->minor_version); | |
7017 | } | |
e691063a N |
7018 | } else if (mddev->external) |
7019 | seq_printf(seq, " super external:%s", | |
7020 | mddev->metadata_type); | |
7021 | else | |
1cd6bf19 | 7022 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
7023 | |
7024 | if (mddev->pers) { | |
d710e138 | 7025 | mddev->pers->status(seq, mddev); |
1da177e4 | 7026 | seq_printf(seq, "\n "); |
8e1b39d6 N |
7027 | if (mddev->pers->sync_request) { |
7028 | if (mddev->curr_resync > 2) { | |
d710e138 | 7029 | status_resync(seq, mddev); |
8e1b39d6 N |
7030 | seq_printf(seq, "\n "); |
7031 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
7032 | seq_printf(seq, "\tresync=DELAYED\n "); | |
7033 | else if (mddev->recovery_cp < MaxSector) | |
7034 | seq_printf(seq, "\tresync=PENDING\n "); | |
7035 | } | |
32a7627c N |
7036 | } else |
7037 | seq_printf(seq, "\n "); | |
7038 | ||
57148964 | 7039 | bitmap_status(seq, mddev->bitmap); |
1da177e4 LT |
7040 | |
7041 | seq_printf(seq, "\n"); | |
7042 | } | |
7043 | mddev_unlock(mddev); | |
7044 | ||
7045 | return 0; | |
7046 | } | |
7047 | ||
110518bc | 7048 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
7049 | .start = md_seq_start, |
7050 | .next = md_seq_next, | |
7051 | .stop = md_seq_stop, | |
7052 | .show = md_seq_show, | |
7053 | }; | |
7054 | ||
7055 | static int md_seq_open(struct inode *inode, struct file *file) | |
7056 | { | |
f1514638 | 7057 | struct seq_file *seq; |
1da177e4 LT |
7058 | int error; |
7059 | ||
7060 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 7061 | if (error) |
f1514638 KS |
7062 | return error; |
7063 | ||
7064 | seq = file->private_data; | |
7065 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
7066 | return error; |
7067 | } | |
7068 | ||
d7603b7e N |
7069 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
7070 | { | |
f1514638 | 7071 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
7072 | int mask; |
7073 | ||
7074 | poll_wait(filp, &md_event_waiters, wait); | |
7075 | ||
7076 | /* always allow read */ | |
7077 | mask = POLLIN | POLLRDNORM; | |
7078 | ||
f1514638 | 7079 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
7080 | mask |= POLLERR | POLLPRI; |
7081 | return mask; | |
7082 | } | |
7083 | ||
fa027c2a | 7084 | static const struct file_operations md_seq_fops = { |
e24650c2 | 7085 | .owner = THIS_MODULE, |
1da177e4 LT |
7086 | .open = md_seq_open, |
7087 | .read = seq_read, | |
7088 | .llseek = seq_lseek, | |
c3f94b40 | 7089 | .release = seq_release_private, |
d7603b7e | 7090 | .poll = mdstat_poll, |
1da177e4 LT |
7091 | }; |
7092 | ||
84fc4b56 | 7093 | int register_md_personality(struct md_personality *p) |
1da177e4 | 7094 | { |
1da177e4 | 7095 | spin_lock(&pers_lock); |
2604b703 N |
7096 | list_add_tail(&p->list, &pers_list); |
7097 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
7098 | spin_unlock(&pers_lock); |
7099 | return 0; | |
7100 | } | |
7101 | ||
84fc4b56 | 7102 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 7103 | { |
2604b703 | 7104 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 7105 | spin_lock(&pers_lock); |
2604b703 | 7106 | list_del_init(&p->list); |
1da177e4 LT |
7107 | spin_unlock(&pers_lock); |
7108 | return 0; | |
7109 | } | |
7110 | ||
fd01b88c | 7111 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 7112 | { |
3cb03002 | 7113 | struct md_rdev * rdev; |
1da177e4 | 7114 | int idle; |
eea1bf38 | 7115 | int curr_events; |
1da177e4 LT |
7116 | |
7117 | idle = 1; | |
4b80991c N |
7118 | rcu_read_lock(); |
7119 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 7120 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
7121 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
7122 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
7123 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
7124 | /* sync IO will cause sync_io to increase before the disk_stats |
7125 | * as sync_io is counted when a request starts, and | |
7126 | * disk_stats is counted when it completes. | |
7127 | * So resync activity will cause curr_events to be smaller than | |
7128 | * when there was no such activity. | |
7129 | * non-sync IO will cause disk_stat to increase without | |
7130 | * increasing sync_io so curr_events will (eventually) | |
7131 | * be larger than it was before. Once it becomes | |
7132 | * substantially larger, the test below will cause | |
7133 | * the array to appear non-idle, and resync will slow | |
7134 | * down. | |
7135 | * If there is a lot of outstanding resync activity when | |
7136 | * we set last_event to curr_events, then all that activity | |
7137 | * completing might cause the array to appear non-idle | |
7138 | * and resync will be slowed down even though there might | |
7139 | * not have been non-resync activity. This will only | |
7140 | * happen once though. 'last_events' will soon reflect | |
7141 | * the state where there is little or no outstanding | |
7142 | * resync requests, and further resync activity will | |
7143 | * always make curr_events less than last_events. | |
c0e48521 | 7144 | * |
1da177e4 | 7145 | */ |
eea1bf38 | 7146 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
7147 | rdev->last_events = curr_events; |
7148 | idle = 0; | |
7149 | } | |
7150 | } | |
4b80991c | 7151 | rcu_read_unlock(); |
1da177e4 LT |
7152 | return idle; |
7153 | } | |
7154 | ||
fd01b88c | 7155 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
7156 | { |
7157 | /* another "blocks" (512byte) blocks have been synced */ | |
7158 | atomic_sub(blocks, &mddev->recovery_active); | |
7159 | wake_up(&mddev->recovery_wait); | |
7160 | if (!ok) { | |
dfc70645 | 7161 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
7162 | md_wakeup_thread(mddev->thread); |
7163 | // stop recovery, signal do_sync .... | |
7164 | } | |
7165 | } | |
7166 | ||
7167 | ||
06d91a5f N |
7168 | /* md_write_start(mddev, bi) |
7169 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
7170 | * in superblock) before writing, schedule a superblock update |
7171 | * and wait for it to complete. | |
06d91a5f | 7172 | */ |
fd01b88c | 7173 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 7174 | { |
0fd62b86 | 7175 | int did_change = 0; |
06d91a5f | 7176 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 7177 | return; |
06d91a5f | 7178 | |
f91de92e N |
7179 | BUG_ON(mddev->ro == 1); |
7180 | if (mddev->ro == 2) { | |
7181 | /* need to switch to read/write */ | |
7182 | mddev->ro = 0; | |
7183 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7184 | md_wakeup_thread(mddev->thread); | |
25156198 | 7185 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 7186 | did_change = 1; |
f91de92e | 7187 | } |
06d91a5f | 7188 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
7189 | if (mddev->safemode == 1) |
7190 | mddev->safemode = 0; | |
06d91a5f | 7191 | if (mddev->in_sync) { |
a9701a30 | 7192 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
7193 | if (mddev->in_sync) { |
7194 | mddev->in_sync = 0; | |
850b2b42 | 7195 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 7196 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 7197 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 7198 | did_change = 1; |
3d310eb7 | 7199 | } |
a9701a30 | 7200 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 7201 | } |
0fd62b86 | 7202 | if (did_change) |
00bcb4ac | 7203 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7204 | wait_event(mddev->sb_wait, |
09a44cc1 | 7205 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
7206 | } |
7207 | ||
fd01b88c | 7208 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7209 | { |
7210 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7211 | if (mddev->safemode == 2) | |
7212 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7213 | else if (mddev->safemode_delay) |
1da177e4 LT |
7214 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7215 | } | |
7216 | } | |
7217 | ||
2a2275d6 N |
7218 | /* md_allow_write(mddev) |
7219 | * Calling this ensures that the array is marked 'active' so that writes | |
7220 | * may proceed without blocking. It is important to call this before | |
7221 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7222 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7223 | * |
7224 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7225 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7226 | */ |
fd01b88c | 7227 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7228 | { |
7229 | if (!mddev->pers) | |
b5470dc5 | 7230 | return 0; |
2a2275d6 | 7231 | if (mddev->ro) |
b5470dc5 | 7232 | return 0; |
1a0fd497 | 7233 | if (!mddev->pers->sync_request) |
b5470dc5 | 7234 | return 0; |
2a2275d6 N |
7235 | |
7236 | spin_lock_irq(&mddev->write_lock); | |
7237 | if (mddev->in_sync) { | |
7238 | mddev->in_sync = 0; | |
7239 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7240 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7241 | if (mddev->safemode_delay && |
7242 | mddev->safemode == 0) | |
7243 | mddev->safemode = 1; | |
7244 | spin_unlock_irq(&mddev->write_lock); | |
7245 | md_update_sb(mddev, 0); | |
00bcb4ac | 7246 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
7247 | } else |
7248 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 7249 | |
070dc6dd | 7250 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7251 | return -EAGAIN; |
7252 | else | |
7253 | return 0; | |
2a2275d6 N |
7254 | } |
7255 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7256 | ||
1da177e4 LT |
7257 | #define SYNC_MARKS 10 |
7258 | #define SYNC_MARK_STEP (3*HZ) | |
fd01b88c | 7259 | void md_do_sync(struct mddev *mddev) |
1da177e4 | 7260 | { |
fd01b88c | 7261 | struct mddev *mddev2; |
1da177e4 LT |
7262 | unsigned int currspeed = 0, |
7263 | window; | |
57afd89f | 7264 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
7265 | unsigned long mark[SYNC_MARKS]; |
7266 | sector_t mark_cnt[SYNC_MARKS]; | |
7267 | int last_mark,m; | |
7268 | struct list_head *tmp; | |
7269 | sector_t last_check; | |
57afd89f | 7270 | int skipped = 0; |
3cb03002 | 7271 | struct md_rdev *rdev; |
61df9d91 | 7272 | char *desc; |
1da177e4 LT |
7273 | |
7274 | /* just incase thread restarts... */ | |
7275 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7276 | return; | |
5fd6c1dc N |
7277 | if (mddev->ro) /* never try to sync a read-only array */ |
7278 | return; | |
1da177e4 | 7279 | |
61df9d91 N |
7280 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
7281 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
7282 | desc = "data-check"; | |
7283 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7284 | desc = "requested-resync"; | |
7285 | else | |
7286 | desc = "resync"; | |
7287 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7288 | desc = "reshape"; | |
7289 | else | |
7290 | desc = "recovery"; | |
7291 | ||
1da177e4 LT |
7292 | /* we overload curr_resync somewhat here. |
7293 | * 0 == not engaged in resync at all | |
7294 | * 2 == checking that there is no conflict with another sync | |
7295 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7296 | * commense | |
7297 | * other == active in resync - this many blocks | |
7298 | * | |
7299 | * Before starting a resync we must have set curr_resync to | |
7300 | * 2, and then checked that every "conflicting" array has curr_resync | |
7301 | * less than ours. When we find one that is the same or higher | |
7302 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7303 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7304 | * This will mean we have to start checking from the beginning again. | |
7305 | * | |
7306 | */ | |
7307 | ||
7308 | do { | |
7309 | mddev->curr_resync = 2; | |
7310 | ||
7311 | try_again: | |
404e4b43 | 7312 | if (kthread_should_stop()) |
6985c43f | 7313 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
7314 | |
7315 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 7316 | goto skip; |
29ac4aa3 | 7317 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7318 | if (mddev2 == mddev) |
7319 | continue; | |
90b08710 BS |
7320 | if (!mddev->parallel_resync |
7321 | && mddev2->curr_resync | |
7322 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7323 | DEFINE_WAIT(wq); |
7324 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7325 | /* arbitrarily yield */ | |
7326 | mddev->curr_resync = 1; | |
7327 | wake_up(&resync_wait); | |
7328 | } | |
7329 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7330 | /* no need to wait here, we can wait the next | |
7331 | * time 'round when curr_resync == 2 | |
7332 | */ | |
7333 | continue; | |
9744197c N |
7334 | /* We need to wait 'interruptible' so as not to |
7335 | * contribute to the load average, and not to | |
7336 | * be caught by 'softlockup' | |
7337 | */ | |
7338 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 7339 | if (!kthread_should_stop() && |
8712e553 | 7340 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7341 | printk(KERN_INFO "md: delaying %s of %s" |
7342 | " until %s has finished (they" | |
1da177e4 | 7343 | " share one or more physical units)\n", |
61df9d91 | 7344 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7345 | mddev_put(mddev2); |
9744197c N |
7346 | if (signal_pending(current)) |
7347 | flush_signals(current); | |
1da177e4 LT |
7348 | schedule(); |
7349 | finish_wait(&resync_wait, &wq); | |
7350 | goto try_again; | |
7351 | } | |
7352 | finish_wait(&resync_wait, &wq); | |
7353 | } | |
7354 | } | |
7355 | } while (mddev->curr_resync < 2); | |
7356 | ||
5fd6c1dc | 7357 | j = 0; |
9d88883e | 7358 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7359 | /* resync follows the size requested by the personality, |
57afd89f | 7360 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7361 | */ |
7362 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 7363 | mddev->resync_mismatches = 0; |
5fd6c1dc | 7364 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7365 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7366 | j = mddev->resync_min; | |
7367 | else if (!mddev->bitmap) | |
5fd6c1dc | 7368 | j = mddev->recovery_cp; |
5e96ee65 | 7369 | |
ccfcc3c1 | 7370 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
c804cdec | 7371 | max_sectors = mddev->resync_max_sectors; |
5fd6c1dc | 7372 | else { |
1da177e4 | 7373 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7374 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7375 | j = MaxSector; |
4e59ca7d | 7376 | rcu_read_lock(); |
dafb20fa | 7377 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc N |
7378 | if (rdev->raid_disk >= 0 && |
7379 | !test_bit(Faulty, &rdev->flags) && | |
7380 | !test_bit(In_sync, &rdev->flags) && | |
7381 | rdev->recovery_offset < j) | |
7382 | j = rdev->recovery_offset; | |
4e59ca7d | 7383 | rcu_read_unlock(); |
5fd6c1dc | 7384 | } |
1da177e4 | 7385 | |
61df9d91 N |
7386 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7387 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7388 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7389 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7390 | "(but not more than %d KB/sec) for %s.\n", |
7391 | speed_max(mddev), desc); | |
1da177e4 | 7392 | |
eea1bf38 | 7393 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7394 | |
57afd89f | 7395 | io_sectors = 0; |
1da177e4 LT |
7396 | for (m = 0; m < SYNC_MARKS; m++) { |
7397 | mark[m] = jiffies; | |
57afd89f | 7398 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7399 | } |
7400 | last_mark = 0; | |
7401 | mddev->resync_mark = mark[last_mark]; | |
7402 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7403 | ||
7404 | /* | |
7405 | * Tune reconstruction: | |
7406 | */ | |
7407 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7408 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7409 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7410 | |
7411 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7412 | last_check = 0; |
7413 | ||
7414 | if (j>2) { | |
7415 | printk(KERN_INFO | |
61df9d91 N |
7416 | "md: resuming %s of %s from checkpoint.\n", |
7417 | desc, mdname(mddev)); | |
1da177e4 LT |
7418 | mddev->curr_resync = j; |
7419 | } | |
75d3da43 | 7420 | mddev->curr_resync_completed = j; |
1da177e4 LT |
7421 | |
7422 | while (j < max_sectors) { | |
57afd89f | 7423 | sector_t sectors; |
1da177e4 | 7424 | |
57afd89f | 7425 | skipped = 0; |
97e4f42d | 7426 | |
7a91ee1f N |
7427 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7428 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7429 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7430 | > (max_sectors >> 4)) || | |
7431 | (j - mddev->curr_resync_completed)*2 | |
7432 | >= mddev->resync_max - mddev->curr_resync_completed | |
7433 | )) { | |
97e4f42d | 7434 | /* time to update curr_resync_completed */ |
97e4f42d N |
7435 | wait_event(mddev->recovery_wait, |
7436 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7437 | mddev->curr_resync_completed = j; |
070dc6dd | 7438 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7439 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7440 | } |
acb180b0 | 7441 | |
e62e58a5 N |
7442 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
7443 | /* As this condition is controlled by user-space, | |
7444 | * we can block indefinitely, so use '_interruptible' | |
7445 | * to avoid triggering warnings. | |
7446 | */ | |
7447 | flush_signals(current); /* just in case */ | |
7448 | wait_event_interruptible(mddev->recovery_wait, | |
7449 | mddev->resync_max > j | |
7450 | || kthread_should_stop()); | |
7451 | } | |
acb180b0 N |
7452 | |
7453 | if (kthread_should_stop()) | |
7454 | goto interrupted; | |
7455 | ||
57afd89f | 7456 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7457 | currspeed < speed_min(mddev)); |
57afd89f | 7458 | if (sectors == 0) { |
dfc70645 | 7459 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
7460 | goto out; |
7461 | } | |
57afd89f N |
7462 | |
7463 | if (!skipped) { /* actual IO requested */ | |
7464 | io_sectors += sectors; | |
7465 | atomic_add(sectors, &mddev->recovery_active); | |
7466 | } | |
7467 | ||
e875ecea N |
7468 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7469 | break; | |
7470 | ||
1da177e4 LT |
7471 | j += sectors; |
7472 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 7473 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7474 | if (last_check == 0) |
e875ecea | 7475 | /* this is the earliest that rebuild will be |
d7603b7e N |
7476 | * visible in /proc/mdstat |
7477 | */ | |
7478 | md_new_event(mddev); | |
57afd89f N |
7479 | |
7480 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7481 | continue; |
7482 | ||
57afd89f | 7483 | last_check = io_sectors; |
1da177e4 LT |
7484 | repeat: |
7485 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7486 | /* step marks */ | |
7487 | int next = (last_mark+1) % SYNC_MARKS; | |
7488 | ||
7489 | mddev->resync_mark = mark[next]; | |
7490 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7491 | mark[next] = jiffies; | |
57afd89f | 7492 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7493 | last_mark = next; |
7494 | } | |
7495 | ||
7496 | ||
c6207277 N |
7497 | if (kthread_should_stop()) |
7498 | goto interrupted; | |
7499 | ||
1da177e4 LT |
7500 | |
7501 | /* | |
7502 | * this loop exits only if either when we are slower than | |
7503 | * the 'hard' speed limit, or the system was IO-idle for | |
7504 | * a jiffy. | |
7505 | * the system might be non-idle CPU-wise, but we only care | |
7506 | * about not overloading the IO subsystem. (things like an | |
7507 | * e2fsck being done on the RAID array should execute fast) | |
7508 | */ | |
1da177e4 LT |
7509 | cond_resched(); |
7510 | ||
57afd89f N |
7511 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
7512 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 7513 | |
88202a0c N |
7514 | if (currspeed > speed_min(mddev)) { |
7515 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7516 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7517 | msleep(500); |
1da177e4 LT |
7518 | goto repeat; |
7519 | } | |
7520 | } | |
7521 | } | |
61df9d91 | 7522 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
7523 | /* |
7524 | * this also signals 'finished resyncing' to md_stop | |
7525 | */ | |
7526 | out: | |
1da177e4 LT |
7527 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7528 | ||
7529 | /* tell personality that we are finished */ | |
57afd89f | 7530 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7531 | |
dfc70645 | 7532 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7533 | mddev->curr_resync > 2) { |
7534 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7535 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7536 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7537 | printk(KERN_INFO | |
61df9d91 N |
7538 | "md: checkpointing %s of %s.\n", |
7539 | desc, mdname(mddev)); | |
db91ff55 N |
7540 | mddev->recovery_cp = |
7541 | mddev->curr_resync_completed; | |
5fd6c1dc N |
7542 | } |
7543 | } else | |
7544 | mddev->recovery_cp = MaxSector; | |
7545 | } else { | |
7546 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7547 | mddev->curr_resync = MaxSector; | |
4e59ca7d | 7548 | rcu_read_lock(); |
dafb20fa | 7549 | rdev_for_each_rcu(rdev, mddev) |
5fd6c1dc | 7550 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7551 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7552 | !test_bit(Faulty, &rdev->flags) && |
7553 | !test_bit(In_sync, &rdev->flags) && | |
7554 | rdev->recovery_offset < mddev->curr_resync) | |
7555 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7556 | rcu_read_unlock(); |
5fd6c1dc | 7557 | } |
1da177e4 | 7558 | } |
db91ff55 | 7559 | skip: |
17571284 | 7560 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7561 | |
c07b70ad N |
7562 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7563 | /* We completed so min/max setting can be forgotten if used. */ | |
7564 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7565 | mddev->resync_min = 0; | |
7566 | mddev->resync_max = MaxSector; | |
7567 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7568 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7569 | mddev->curr_resync = 0; |
7570 | wake_up(&resync_wait); | |
7571 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7572 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
7573 | return; |
7574 | ||
7575 | interrupted: | |
7576 | /* | |
7577 | * got a signal, exit. | |
7578 | */ | |
7579 | printk(KERN_INFO | |
7580 | "md: md_do_sync() got signal ... exiting\n"); | |
7581 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7582 | goto out; | |
7583 | ||
1da177e4 | 7584 | } |
29269553 | 7585 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7586 | |
fd01b88c | 7587 | static int remove_and_add_spares(struct mddev *mddev) |
b4c4c7b8 | 7588 | { |
3cb03002 | 7589 | struct md_rdev *rdev; |
b4c4c7b8 | 7590 | int spares = 0; |
f2a371c5 | 7591 | int removed = 0; |
b4c4c7b8 | 7592 | |
97e4f42d N |
7593 | mddev->curr_resync_completed = 0; |
7594 | ||
dafb20fa | 7595 | rdev_for_each(rdev, mddev) |
b4c4c7b8 | 7596 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 7597 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7598 | (test_bit(Faulty, &rdev->flags) || |
7599 | ! test_bit(In_sync, &rdev->flags)) && | |
7600 | atomic_read(&rdev->nr_pending)==0) { | |
7601 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7602 | mddev, rdev) == 0) { |
36fad858 | 7603 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 | 7604 | rdev->raid_disk = -1; |
f2a371c5 | 7605 | removed++; |
b4c4c7b8 N |
7606 | } |
7607 | } | |
f2a371c5 N |
7608 | if (removed) |
7609 | sysfs_notify(&mddev->kobj, NULL, | |
7610 | "degraded"); | |
7611 | ||
b4c4c7b8 | 7612 | |
dafb20fa | 7613 | rdev_for_each(rdev, mddev) { |
7bfec5f3 N |
7614 | if (rdev->raid_disk >= 0 && |
7615 | !test_bit(In_sync, &rdev->flags) && | |
7616 | !test_bit(Faulty, &rdev->flags)) | |
7617 | spares++; | |
7618 | if (rdev->raid_disk < 0 | |
7619 | && !test_bit(Faulty, &rdev->flags)) { | |
7620 | rdev->recovery_offset = 0; | |
7621 | if (mddev->pers-> | |
7622 | hot_add_disk(mddev, rdev) == 0) { | |
7623 | if (sysfs_link_rdev(mddev, rdev)) | |
7624 | /* failure here is OK */; | |
dfc70645 | 7625 | spares++; |
7bfec5f3 N |
7626 | md_new_event(mddev); |
7627 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
b4c4c7b8 | 7628 | } |
dfc70645 | 7629 | } |
b4c4c7b8 N |
7630 | } |
7631 | return spares; | |
7632 | } | |
7ebc0be7 | 7633 | |
fd01b88c | 7634 | static void reap_sync_thread(struct mddev *mddev) |
7ebc0be7 | 7635 | { |
3cb03002 | 7636 | struct md_rdev *rdev; |
7ebc0be7 N |
7637 | |
7638 | /* resync has finished, collect result */ | |
01f96c0a | 7639 | md_unregister_thread(&mddev->sync_thread); |
7ebc0be7 N |
7640 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
7641 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7642 | /* success...*/ | |
7643 | /* activate any spares */ | |
7644 | if (mddev->pers->spare_active(mddev)) | |
7645 | sysfs_notify(&mddev->kobj, NULL, | |
7646 | "degraded"); | |
7647 | } | |
7648 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7649 | mddev->pers->finish_reshape) | |
7650 | mddev->pers->finish_reshape(mddev); | |
7ebc0be7 | 7651 | |
d70ed2e4 AW |
7652 | /* If array is no-longer degraded, then any saved_raid_disk |
7653 | * information must be scrapped. Also if any device is now | |
7654 | * In_sync we must scrape the saved_raid_disk for that device | |
7655 | * do the superblock for an incrementally recovered device | |
7656 | * written out. | |
7ebc0be7 | 7657 | */ |
dafb20fa | 7658 | rdev_for_each(rdev, mddev) |
d70ed2e4 AW |
7659 | if (!mddev->degraded || |
7660 | test_bit(In_sync, &rdev->flags)) | |
7ebc0be7 N |
7661 | rdev->saved_raid_disk = -1; |
7662 | ||
d70ed2e4 | 7663 | md_update_sb(mddev, 1); |
7ebc0be7 N |
7664 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7665 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7666 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7667 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7668 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7669 | /* flag recovery needed just to double check */ | |
7670 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7671 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7672 | md_new_event(mddev); | |
768e587e JB |
7673 | if (mddev->event_work.func) |
7674 | queue_work(md_misc_wq, &mddev->event_work); | |
7ebc0be7 N |
7675 | } |
7676 | ||
1da177e4 LT |
7677 | /* |
7678 | * This routine is regularly called by all per-raid-array threads to | |
7679 | * deal with generic issues like resync and super-block update. | |
7680 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7681 | * need this as they never do any recovery or update the superblock. | |
7682 | * | |
7683 | * It does not do any resync itself, but rather "forks" off other threads | |
7684 | * to do that as needed. | |
7685 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7686 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7687 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7688 | * and wakeups up this thread which will reap the thread and finish up. |
7689 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7690 | * | |
7691 | * The overall approach is: | |
7692 | * 1/ if the superblock needs updating, update it. | |
7693 | * 2/ If a recovery thread is running, don't do anything else. | |
7694 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7695 | * 4/ If there are any faulty devices, remove them. | |
7696 | * 5/ If array is degraded, try to add spares devices | |
7697 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7698 | */ | |
fd01b88c | 7699 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 7700 | { |
68866e42 JB |
7701 | if (mddev->suspended) |
7702 | return; | |
7703 | ||
5f40402d | 7704 | if (mddev->bitmap) |
aa5cbd10 | 7705 | bitmap_daemon_work(mddev); |
1da177e4 | 7706 | |
fca4d848 | 7707 | if (signal_pending(current)) { |
31a59e34 | 7708 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7709 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7710 | mdname(mddev)); | |
7711 | mddev->safemode = 2; | |
7712 | } | |
7713 | flush_signals(current); | |
7714 | } | |
7715 | ||
c89a8eee N |
7716 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7717 | return; | |
1da177e4 | 7718 | if ( ! ( |
126925c0 | 7719 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7720 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7721 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7722 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7723 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7724 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7725 | )) |
7726 | return; | |
fca4d848 | 7727 | |
df5b89b3 | 7728 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7729 | int spares = 0; |
fca4d848 | 7730 | |
c89a8eee N |
7731 | if (mddev->ro) { |
7732 | /* Only thing we do on a ro array is remove | |
7733 | * failed devices. | |
7734 | */ | |
3cb03002 | 7735 | struct md_rdev *rdev; |
dafb20fa | 7736 | rdev_for_each(rdev, mddev) |
a8c42c7f N |
7737 | if (rdev->raid_disk >= 0 && |
7738 | !test_bit(Blocked, &rdev->flags) && | |
7739 | test_bit(Faulty, &rdev->flags) && | |
7740 | atomic_read(&rdev->nr_pending)==0) { | |
7741 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7742 | mddev, rdev) == 0) { |
36fad858 | 7743 | sysfs_unlink_rdev(mddev, rdev); |
a8c42c7f N |
7744 | rdev->raid_disk = -1; |
7745 | } | |
7746 | } | |
c89a8eee N |
7747 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7748 | goto unlock; | |
7749 | } | |
7750 | ||
31a59e34 | 7751 | if (!mddev->external) { |
0fd62b86 | 7752 | int did_change = 0; |
31a59e34 N |
7753 | spin_lock_irq(&mddev->write_lock); |
7754 | if (mddev->safemode && | |
7755 | !atomic_read(&mddev->writes_pending) && | |
7756 | !mddev->in_sync && | |
7757 | mddev->recovery_cp == MaxSector) { | |
7758 | mddev->in_sync = 1; | |
0fd62b86 | 7759 | did_change = 1; |
070dc6dd | 7760 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7761 | } |
7762 | if (mddev->safemode == 1) | |
7763 | mddev->safemode = 0; | |
7764 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7765 | if (did_change) |
00bcb4ac | 7766 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7767 | } |
fca4d848 | 7768 | |
850b2b42 N |
7769 | if (mddev->flags) |
7770 | md_update_sb(mddev, 0); | |
06d91a5f | 7771 | |
1da177e4 LT |
7772 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7773 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7774 | /* resync/recovery still happening */ | |
7775 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7776 | goto unlock; | |
7777 | } | |
7778 | if (mddev->sync_thread) { | |
7ebc0be7 | 7779 | reap_sync_thread(mddev); |
1da177e4 LT |
7780 | goto unlock; |
7781 | } | |
72a23c21 NB |
7782 | /* Set RUNNING before clearing NEEDED to avoid |
7783 | * any transients in the value of "sync_action". | |
7784 | */ | |
7785 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
24dd469d N |
7786 | /* Clear some bits that don't mean anything, but |
7787 | * might be left set | |
7788 | */ | |
24dd469d N |
7789 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7790 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7791 | |
ed209584 N |
7792 | if (!test_and_clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
7793 | test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) | |
5fd6c1dc | 7794 | goto unlock; |
1da177e4 LT |
7795 | /* no recovery is running. |
7796 | * remove any failed drives, then | |
7797 | * add spares if possible. | |
7798 | * Spare are also removed and re-added, to allow | |
7799 | * the personality to fail the re-add. | |
7800 | */ | |
1da177e4 | 7801 | |
b4c4c7b8 | 7802 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7803 | if (mddev->pers->check_reshape == NULL || |
7804 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7805 | /* Cannot proceed */ |
7806 | goto unlock; | |
7807 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7808 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7809 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7810 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7811 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7812 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7813 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7814 | } else if (mddev->recovery_cp < MaxSector) { |
7815 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7816 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7817 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7818 | /* nothing to be done ... */ | |
1da177e4 | 7819 | goto unlock; |
24dd469d | 7820 | |
1da177e4 | 7821 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7822 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7823 | /* We are adding a device or devices to an array | |
7824 | * which has the bitmap stored on all devices. | |
7825 | * So make sure all bitmap pages get written | |
7826 | */ | |
7827 | bitmap_write_all(mddev->bitmap); | |
7828 | } | |
1da177e4 LT |
7829 | mddev->sync_thread = md_register_thread(md_do_sync, |
7830 | mddev, | |
0da3c619 | 7831 | "resync"); |
1da177e4 LT |
7832 | if (!mddev->sync_thread) { |
7833 | printk(KERN_ERR "%s: could not start resync" | |
7834 | " thread...\n", | |
7835 | mdname(mddev)); | |
7836 | /* leave the spares where they are, it shouldn't hurt */ | |
7ebc0be7 N |
7837 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7838 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7839 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7840 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7841 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
d7603b7e | 7842 | } else |
1da177e4 | 7843 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7844 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7845 | md_new_event(mddev); |
1da177e4 LT |
7846 | } |
7847 | unlock: | |
72a23c21 NB |
7848 | if (!mddev->sync_thread) { |
7849 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7850 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7851 | &mddev->recovery)) | |
0c3573f1 | 7852 | if (mddev->sysfs_action) |
00bcb4ac | 7853 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7854 | } |
1da177e4 LT |
7855 | mddev_unlock(mddev); |
7856 | } | |
7857 | } | |
7858 | ||
fd01b88c | 7859 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 7860 | { |
00bcb4ac | 7861 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 7862 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
7863 | !test_bit(Blocked, &rdev->flags) && |
7864 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
7865 | msecs_to_jiffies(5000)); |
7866 | rdev_dec_pending(rdev, mddev); | |
7867 | } | |
7868 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7869 | ||
c6563a8c N |
7870 | void md_finish_reshape(struct mddev *mddev) |
7871 | { | |
7872 | /* called be personality module when reshape completes. */ | |
7873 | struct md_rdev *rdev; | |
7874 | ||
7875 | rdev_for_each(rdev, mddev) { | |
7876 | if (rdev->data_offset > rdev->new_data_offset) | |
7877 | rdev->sectors += rdev->data_offset - rdev->new_data_offset; | |
7878 | else | |
7879 | rdev->sectors -= rdev->new_data_offset - rdev->data_offset; | |
7880 | rdev->data_offset = rdev->new_data_offset; | |
7881 | } | |
7882 | } | |
7883 | EXPORT_SYMBOL(md_finish_reshape); | |
2230dfe4 N |
7884 | |
7885 | /* Bad block management. | |
7886 | * We can record which blocks on each device are 'bad' and so just | |
7887 | * fail those blocks, or that stripe, rather than the whole device. | |
7888 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7889 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7890 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7891 | * A 'shift' can be set so that larger blocks are tracked and | |
7892 | * consequently larger devices can be covered. | |
7893 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7894 | * | |
7895 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7896 | * might need to retry if it is very unlucky. | |
7897 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7898 | * so we use the write_seqlock_irq variant. | |
7899 | * | |
7900 | * When looking for a bad block we specify a range and want to | |
7901 | * know if any block in the range is bad. So we binary-search | |
7902 | * to the last range that starts at-or-before the given endpoint, | |
7903 | * (or "before the sector after the target range") | |
7904 | * then see if it ends after the given start. | |
7905 | * We return | |
7906 | * 0 if there are no known bad blocks in the range | |
7907 | * 1 if there are known bad block which are all acknowledged | |
7908 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
7909 | * plus the start/length of the first bad section we overlap. | |
7910 | */ | |
7911 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
7912 | sector_t *first_bad, int *bad_sectors) | |
7913 | { | |
7914 | int hi; | |
7915 | int lo = 0; | |
7916 | u64 *p = bb->page; | |
7917 | int rv = 0; | |
7918 | sector_t target = s + sectors; | |
7919 | unsigned seq; | |
7920 | ||
7921 | if (bb->shift > 0) { | |
7922 | /* round the start down, and the end up */ | |
7923 | s >>= bb->shift; | |
7924 | target += (1<<bb->shift) - 1; | |
7925 | target >>= bb->shift; | |
7926 | sectors = target - s; | |
7927 | } | |
7928 | /* 'target' is now the first block after the bad range */ | |
7929 | ||
7930 | retry: | |
7931 | seq = read_seqbegin(&bb->lock); | |
7932 | ||
7933 | hi = bb->count; | |
7934 | ||
7935 | /* Binary search between lo and hi for 'target' | |
7936 | * i.e. for the last range that starts before 'target' | |
7937 | */ | |
7938 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
7939 | * are known not to be the last range before target. | |
7940 | * VARIANT: hi-lo is the number of possible | |
7941 | * ranges, and decreases until it reaches 1 | |
7942 | */ | |
7943 | while (hi - lo > 1) { | |
7944 | int mid = (lo + hi) / 2; | |
7945 | sector_t a = BB_OFFSET(p[mid]); | |
7946 | if (a < target) | |
7947 | /* This could still be the one, earlier ranges | |
7948 | * could not. */ | |
7949 | lo = mid; | |
7950 | else | |
7951 | /* This and later ranges are definitely out. */ | |
7952 | hi = mid; | |
7953 | } | |
7954 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
7955 | if (hi > lo) { | |
7956 | /* need to check all range that end after 's' to see if | |
7957 | * any are unacknowledged. | |
7958 | */ | |
7959 | while (lo >= 0 && | |
7960 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7961 | if (BB_OFFSET(p[lo]) < target) { | |
7962 | /* starts before the end, and finishes after | |
7963 | * the start, so they must overlap | |
7964 | */ | |
7965 | if (rv != -1 && BB_ACK(p[lo])) | |
7966 | rv = 1; | |
7967 | else | |
7968 | rv = -1; | |
7969 | *first_bad = BB_OFFSET(p[lo]); | |
7970 | *bad_sectors = BB_LEN(p[lo]); | |
7971 | } | |
7972 | lo--; | |
7973 | } | |
7974 | } | |
7975 | ||
7976 | if (read_seqretry(&bb->lock, seq)) | |
7977 | goto retry; | |
7978 | ||
7979 | return rv; | |
7980 | } | |
7981 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
7982 | ||
7983 | /* | |
7984 | * Add a range of bad blocks to the table. | |
7985 | * This might extend the table, or might contract it | |
7986 | * if two adjacent ranges can be merged. | |
7987 | * We binary-search to find the 'insertion' point, then | |
7988 | * decide how best to handle it. | |
7989 | */ | |
7990 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
7991 | int acknowledged) | |
7992 | { | |
7993 | u64 *p; | |
7994 | int lo, hi; | |
7995 | int rv = 1; | |
7996 | ||
7997 | if (bb->shift < 0) | |
7998 | /* badblocks are disabled */ | |
7999 | return 0; | |
8000 | ||
8001 | if (bb->shift) { | |
8002 | /* round the start down, and the end up */ | |
8003 | sector_t next = s + sectors; | |
8004 | s >>= bb->shift; | |
8005 | next += (1<<bb->shift) - 1; | |
8006 | next >>= bb->shift; | |
8007 | sectors = next - s; | |
8008 | } | |
8009 | ||
8010 | write_seqlock_irq(&bb->lock); | |
8011 | ||
8012 | p = bb->page; | |
8013 | lo = 0; | |
8014 | hi = bb->count; | |
8015 | /* Find the last range that starts at-or-before 's' */ | |
8016 | while (hi - lo > 1) { | |
8017 | int mid = (lo + hi) / 2; | |
8018 | sector_t a = BB_OFFSET(p[mid]); | |
8019 | if (a <= s) | |
8020 | lo = mid; | |
8021 | else | |
8022 | hi = mid; | |
8023 | } | |
8024 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
8025 | hi = lo; | |
8026 | ||
8027 | if (hi > lo) { | |
8028 | /* we found a range that might merge with the start | |
8029 | * of our new range | |
8030 | */ | |
8031 | sector_t a = BB_OFFSET(p[lo]); | |
8032 | sector_t e = a + BB_LEN(p[lo]); | |
8033 | int ack = BB_ACK(p[lo]); | |
8034 | if (e >= s) { | |
8035 | /* Yes, we can merge with a previous range */ | |
8036 | if (s == a && s + sectors >= e) | |
8037 | /* new range covers old */ | |
8038 | ack = acknowledged; | |
8039 | else | |
8040 | ack = ack && acknowledged; | |
8041 | ||
8042 | if (e < s + sectors) | |
8043 | e = s + sectors; | |
8044 | if (e - a <= BB_MAX_LEN) { | |
8045 | p[lo] = BB_MAKE(a, e-a, ack); | |
8046 | s = e; | |
8047 | } else { | |
8048 | /* does not all fit in one range, | |
8049 | * make p[lo] maximal | |
8050 | */ | |
8051 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
8052 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8053 | s = a + BB_MAX_LEN; | |
8054 | } | |
8055 | sectors = e - s; | |
8056 | } | |
8057 | } | |
8058 | if (sectors && hi < bb->count) { | |
8059 | /* 'hi' points to the first range that starts after 's'. | |
8060 | * Maybe we can merge with the start of that range */ | |
8061 | sector_t a = BB_OFFSET(p[hi]); | |
8062 | sector_t e = a + BB_LEN(p[hi]); | |
8063 | int ack = BB_ACK(p[hi]); | |
8064 | if (a <= s + sectors) { | |
8065 | /* merging is possible */ | |
8066 | if (e <= s + sectors) { | |
8067 | /* full overlap */ | |
8068 | e = s + sectors; | |
8069 | ack = acknowledged; | |
8070 | } else | |
8071 | ack = ack && acknowledged; | |
8072 | ||
8073 | a = s; | |
8074 | if (e - a <= BB_MAX_LEN) { | |
8075 | p[hi] = BB_MAKE(a, e-a, ack); | |
8076 | s = e; | |
8077 | } else { | |
8078 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
8079 | s = a + BB_MAX_LEN; | |
8080 | } | |
8081 | sectors = e - s; | |
8082 | lo = hi; | |
8083 | hi++; | |
8084 | } | |
8085 | } | |
8086 | if (sectors == 0 && hi < bb->count) { | |
8087 | /* we might be able to combine lo and hi */ | |
8088 | /* Note: 's' is at the end of 'lo' */ | |
8089 | sector_t a = BB_OFFSET(p[hi]); | |
8090 | int lolen = BB_LEN(p[lo]); | |
8091 | int hilen = BB_LEN(p[hi]); | |
8092 | int newlen = lolen + hilen - (s - a); | |
8093 | if (s >= a && newlen < BB_MAX_LEN) { | |
8094 | /* yes, we can combine them */ | |
8095 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
8096 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
8097 | memmove(p + hi, p + hi + 1, | |
8098 | (bb->count - hi - 1) * 8); | |
8099 | bb->count--; | |
8100 | } | |
8101 | } | |
8102 | while (sectors) { | |
8103 | /* didn't merge (it all). | |
8104 | * Need to add a range just before 'hi' */ | |
8105 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8106 | /* No room for more */ | |
8107 | rv = 0; | |
8108 | break; | |
8109 | } else { | |
8110 | int this_sectors = sectors; | |
8111 | memmove(p + hi + 1, p + hi, | |
8112 | (bb->count - hi) * 8); | |
8113 | bb->count++; | |
8114 | ||
8115 | if (this_sectors > BB_MAX_LEN) | |
8116 | this_sectors = BB_MAX_LEN; | |
8117 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
8118 | sectors -= this_sectors; | |
8119 | s += this_sectors; | |
8120 | } | |
8121 | } | |
8122 | ||
8123 | bb->changed = 1; | |
de393cde N |
8124 | if (!acknowledged) |
8125 | bb->unacked_exist = 1; | |
2230dfe4 N |
8126 | write_sequnlock_irq(&bb->lock); |
8127 | ||
8128 | return rv; | |
8129 | } | |
8130 | ||
3cb03002 | 8131 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
c6563a8c | 8132 | int is_new) |
2230dfe4 | 8133 | { |
c6563a8c N |
8134 | int rv; |
8135 | if (is_new) | |
8136 | s += rdev->new_data_offset; | |
8137 | else | |
8138 | s += rdev->data_offset; | |
8139 | rv = md_set_badblocks(&rdev->badblocks, | |
8140 | s, sectors, 0); | |
2230dfe4 N |
8141 | if (rv) { |
8142 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 8143 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 N |
8144 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
8145 | md_wakeup_thread(rdev->mddev->thread); | |
8146 | } | |
8147 | return rv; | |
8148 | } | |
8149 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
8150 | ||
8151 | /* | |
8152 | * Remove a range of bad blocks from the table. | |
8153 | * This may involve extending the table if we spilt a region, | |
8154 | * but it must not fail. So if the table becomes full, we just | |
8155 | * drop the remove request. | |
8156 | */ | |
8157 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
8158 | { | |
8159 | u64 *p; | |
8160 | int lo, hi; | |
8161 | sector_t target = s + sectors; | |
8162 | int rv = 0; | |
8163 | ||
8164 | if (bb->shift > 0) { | |
8165 | /* When clearing we round the start up and the end down. | |
8166 | * This should not matter as the shift should align with | |
8167 | * the block size and no rounding should ever be needed. | |
8168 | * However it is better the think a block is bad when it | |
8169 | * isn't than to think a block is not bad when it is. | |
8170 | */ | |
8171 | s += (1<<bb->shift) - 1; | |
8172 | s >>= bb->shift; | |
8173 | target >>= bb->shift; | |
8174 | sectors = target - s; | |
8175 | } | |
8176 | ||
8177 | write_seqlock_irq(&bb->lock); | |
8178 | ||
8179 | p = bb->page; | |
8180 | lo = 0; | |
8181 | hi = bb->count; | |
8182 | /* Find the last range that starts before 'target' */ | |
8183 | while (hi - lo > 1) { | |
8184 | int mid = (lo + hi) / 2; | |
8185 | sector_t a = BB_OFFSET(p[mid]); | |
8186 | if (a < target) | |
8187 | lo = mid; | |
8188 | else | |
8189 | hi = mid; | |
8190 | } | |
8191 | if (hi > lo) { | |
8192 | /* p[lo] is the last range that could overlap the | |
8193 | * current range. Earlier ranges could also overlap, | |
8194 | * but only this one can overlap the end of the range. | |
8195 | */ | |
8196 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
8197 | /* Partial overlap, leave the tail of this range */ | |
8198 | int ack = BB_ACK(p[lo]); | |
8199 | sector_t a = BB_OFFSET(p[lo]); | |
8200 | sector_t end = a + BB_LEN(p[lo]); | |
8201 | ||
8202 | if (a < s) { | |
8203 | /* we need to split this range */ | |
8204 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
8205 | rv = 0; | |
8206 | goto out; | |
8207 | } | |
8208 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
8209 | bb->count++; | |
8210 | p[lo] = BB_MAKE(a, s-a, ack); | |
8211 | lo++; | |
8212 | } | |
8213 | p[lo] = BB_MAKE(target, end - target, ack); | |
8214 | /* there is no longer an overlap */ | |
8215 | hi = lo; | |
8216 | lo--; | |
8217 | } | |
8218 | while (lo >= 0 && | |
8219 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
8220 | /* This range does overlap */ | |
8221 | if (BB_OFFSET(p[lo]) < s) { | |
8222 | /* Keep the early parts of this range. */ | |
8223 | int ack = BB_ACK(p[lo]); | |
8224 | sector_t start = BB_OFFSET(p[lo]); | |
8225 | p[lo] = BB_MAKE(start, s - start, ack); | |
8226 | /* now low doesn't overlap, so.. */ | |
8227 | break; | |
8228 | } | |
8229 | lo--; | |
8230 | } | |
8231 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8232 | * anything between needs to be discarded | |
8233 | */ | |
8234 | if (hi - lo > 1) { | |
8235 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8236 | bb->count -= (hi - lo - 1); | |
8237 | } | |
8238 | } | |
8239 | ||
8240 | bb->changed = 1; | |
8241 | out: | |
8242 | write_sequnlock_irq(&bb->lock); | |
8243 | return rv; | |
8244 | } | |
8245 | ||
c6563a8c N |
8246 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
8247 | int is_new) | |
2230dfe4 | 8248 | { |
c6563a8c N |
8249 | if (is_new) |
8250 | s += rdev->new_data_offset; | |
8251 | else | |
8252 | s += rdev->data_offset; | |
2230dfe4 | 8253 | return md_clear_badblocks(&rdev->badblocks, |
c6563a8c | 8254 | s, sectors); |
2230dfe4 N |
8255 | } |
8256 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8257 | ||
8258 | /* | |
8259 | * Acknowledge all bad blocks in a list. | |
8260 | * This only succeeds if ->changed is clear. It is used by | |
8261 | * in-kernel metadata updates | |
8262 | */ | |
8263 | void md_ack_all_badblocks(struct badblocks *bb) | |
8264 | { | |
8265 | if (bb->page == NULL || bb->changed) | |
8266 | /* no point even trying */ | |
8267 | return; | |
8268 | write_seqlock_irq(&bb->lock); | |
8269 | ||
ecb178bb | 8270 | if (bb->changed == 0 && bb->unacked_exist) { |
2230dfe4 N |
8271 | u64 *p = bb->page; |
8272 | int i; | |
8273 | for (i = 0; i < bb->count ; i++) { | |
8274 | if (!BB_ACK(p[i])) { | |
8275 | sector_t start = BB_OFFSET(p[i]); | |
8276 | int len = BB_LEN(p[i]); | |
8277 | p[i] = BB_MAKE(start, len, 1); | |
8278 | } | |
8279 | } | |
de393cde | 8280 | bb->unacked_exist = 0; |
2230dfe4 N |
8281 | } |
8282 | write_sequnlock_irq(&bb->lock); | |
8283 | } | |
8284 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8285 | ||
16c791a5 N |
8286 | /* sysfs access to bad-blocks list. |
8287 | * We present two files. | |
8288 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8289 | * are recorded as bad. The list is truncated to fit within | |
8290 | * the one-page limit of sysfs. | |
8291 | * Writing "sector length" to this file adds an acknowledged | |
8292 | * bad block list. | |
8293 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8294 | * been acknowledged. Writing to this file adds bad blocks | |
8295 | * without acknowledging them. This is largely for testing. | |
8296 | */ | |
8297 | ||
8298 | static ssize_t | |
8299 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8300 | { | |
8301 | size_t len; | |
8302 | int i; | |
8303 | u64 *p = bb->page; | |
8304 | unsigned seq; | |
8305 | ||
8306 | if (bb->shift < 0) | |
8307 | return 0; | |
8308 | ||
8309 | retry: | |
8310 | seq = read_seqbegin(&bb->lock); | |
8311 | ||
8312 | len = 0; | |
8313 | i = 0; | |
8314 | ||
8315 | while (len < PAGE_SIZE && i < bb->count) { | |
8316 | sector_t s = BB_OFFSET(p[i]); | |
8317 | unsigned int length = BB_LEN(p[i]); | |
8318 | int ack = BB_ACK(p[i]); | |
8319 | i++; | |
8320 | ||
8321 | if (unack && ack) | |
8322 | continue; | |
8323 | ||
8324 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8325 | (unsigned long long)s << bb->shift, | |
8326 | length << bb->shift); | |
8327 | } | |
de393cde N |
8328 | if (unack && len == 0) |
8329 | bb->unacked_exist = 0; | |
16c791a5 N |
8330 | |
8331 | if (read_seqretry(&bb->lock, seq)) | |
8332 | goto retry; | |
8333 | ||
8334 | return len; | |
8335 | } | |
8336 | ||
8337 | #define DO_DEBUG 1 | |
8338 | ||
8339 | static ssize_t | |
8340 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8341 | { | |
8342 | unsigned long long sector; | |
8343 | int length; | |
8344 | char newline; | |
8345 | #ifdef DO_DEBUG | |
8346 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8347 | * Normally only a successful write may clear a badblock | |
8348 | */ | |
8349 | int clear = 0; | |
8350 | if (page[0] == '-') { | |
8351 | clear = 1; | |
8352 | page++; | |
8353 | } | |
8354 | #endif /* DO_DEBUG */ | |
8355 | ||
8356 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8357 | case 3: | |
8358 | if (newline != '\n') | |
8359 | return -EINVAL; | |
8360 | case 2: | |
8361 | if (length <= 0) | |
8362 | return -EINVAL; | |
8363 | break; | |
8364 | default: | |
8365 | return -EINVAL; | |
8366 | } | |
8367 | ||
8368 | #ifdef DO_DEBUG | |
8369 | if (clear) { | |
8370 | md_clear_badblocks(bb, sector, length); | |
8371 | return len; | |
8372 | } | |
8373 | #endif /* DO_DEBUG */ | |
8374 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8375 | return len; | |
8376 | else | |
8377 | return -ENOSPC; | |
8378 | } | |
8379 | ||
75c96f85 AB |
8380 | static int md_notify_reboot(struct notifier_block *this, |
8381 | unsigned long code, void *x) | |
1da177e4 LT |
8382 | { |
8383 | struct list_head *tmp; | |
fd01b88c | 8384 | struct mddev *mddev; |
2dba6a91 | 8385 | int need_delay = 0; |
1da177e4 | 8386 | |
c744a65c N |
8387 | for_each_mddev(mddev, tmp) { |
8388 | if (mddev_trylock(mddev)) { | |
30b8aa91 N |
8389 | if (mddev->pers) |
8390 | __md_stop_writes(mddev); | |
c744a65c N |
8391 | mddev->safemode = 2; |
8392 | mddev_unlock(mddev); | |
2dba6a91 | 8393 | } |
c744a65c | 8394 | need_delay = 1; |
1da177e4 | 8395 | } |
c744a65c N |
8396 | /* |
8397 | * certain more exotic SCSI devices are known to be | |
8398 | * volatile wrt too early system reboots. While the | |
8399 | * right place to handle this issue is the given | |
8400 | * driver, we do want to have a safe RAID driver ... | |
8401 | */ | |
8402 | if (need_delay) | |
8403 | mdelay(1000*1); | |
8404 | ||
1da177e4 LT |
8405 | return NOTIFY_DONE; |
8406 | } | |
8407 | ||
75c96f85 | 8408 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8409 | .notifier_call = md_notify_reboot, |
8410 | .next = NULL, | |
8411 | .priority = INT_MAX, /* before any real devices */ | |
8412 | }; | |
8413 | ||
8414 | static void md_geninit(void) | |
8415 | { | |
36a4e1fe | 8416 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8417 | |
c7705f34 | 8418 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8419 | } |
8420 | ||
75c96f85 | 8421 | static int __init md_init(void) |
1da177e4 | 8422 | { |
e804ac78 TH |
8423 | int ret = -ENOMEM; |
8424 | ||
ada609ee | 8425 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8426 | if (!md_wq) |
8427 | goto err_wq; | |
8428 | ||
8429 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8430 | if (!md_misc_wq) | |
8431 | goto err_misc_wq; | |
8432 | ||
8433 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8434 | goto err_md; | |
8435 | ||
8436 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8437 | goto err_mdp; | |
8438 | mdp_major = ret; | |
8439 | ||
3dbd8c2e | 8440 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
8441 | md_probe, NULL, NULL); |
8442 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8443 | md_probe, NULL, NULL); |
8444 | ||
1da177e4 | 8445 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8446 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8447 | |
8448 | md_geninit(); | |
d710e138 | 8449 | return 0; |
1da177e4 | 8450 | |
e804ac78 TH |
8451 | err_mdp: |
8452 | unregister_blkdev(MD_MAJOR, "md"); | |
8453 | err_md: | |
8454 | destroy_workqueue(md_misc_wq); | |
8455 | err_misc_wq: | |
8456 | destroy_workqueue(md_wq); | |
8457 | err_wq: | |
8458 | return ret; | |
8459 | } | |
1da177e4 LT |
8460 | |
8461 | #ifndef MODULE | |
8462 | ||
8463 | /* | |
8464 | * Searches all registered partitions for autorun RAID arrays | |
8465 | * at boot time. | |
8466 | */ | |
4d936ec1 ME |
8467 | |
8468 | static LIST_HEAD(all_detected_devices); | |
8469 | struct detected_devices_node { | |
8470 | struct list_head list; | |
8471 | dev_t dev; | |
8472 | }; | |
1da177e4 LT |
8473 | |
8474 | void md_autodetect_dev(dev_t dev) | |
8475 | { | |
4d936ec1 ME |
8476 | struct detected_devices_node *node_detected_dev; |
8477 | ||
8478 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8479 | if (node_detected_dev) { | |
8480 | node_detected_dev->dev = dev; | |
8481 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8482 | } else { | |
8483 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8484 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8485 | } | |
1da177e4 LT |
8486 | } |
8487 | ||
8488 | ||
8489 | static void autostart_arrays(int part) | |
8490 | { | |
3cb03002 | 8491 | struct md_rdev *rdev; |
4d936ec1 ME |
8492 | struct detected_devices_node *node_detected_dev; |
8493 | dev_t dev; | |
8494 | int i_scanned, i_passed; | |
1da177e4 | 8495 | |
4d936ec1 ME |
8496 | i_scanned = 0; |
8497 | i_passed = 0; | |
1da177e4 | 8498 | |
4d936ec1 | 8499 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8500 | |
4d936ec1 ME |
8501 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8502 | i_scanned++; | |
8503 | node_detected_dev = list_entry(all_detected_devices.next, | |
8504 | struct detected_devices_node, list); | |
8505 | list_del(&node_detected_dev->list); | |
8506 | dev = node_detected_dev->dev; | |
8507 | kfree(node_detected_dev); | |
df968c4e | 8508 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8509 | if (IS_ERR(rdev)) |
8510 | continue; | |
8511 | ||
b2d444d7 | 8512 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
8513 | MD_BUG(); |
8514 | continue; | |
8515 | } | |
d0fae18f | 8516 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8517 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8518 | i_passed++; |
1da177e4 | 8519 | } |
4d936ec1 ME |
8520 | |
8521 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8522 | i_scanned, i_passed); | |
1da177e4 LT |
8523 | |
8524 | autorun_devices(part); | |
8525 | } | |
8526 | ||
fdee8ae4 | 8527 | #endif /* !MODULE */ |
1da177e4 LT |
8528 | |
8529 | static __exit void md_exit(void) | |
8530 | { | |
fd01b88c | 8531 | struct mddev *mddev; |
1da177e4 | 8532 | struct list_head *tmp; |
8ab5e4c1 | 8533 | |
3dbd8c2e | 8534 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 8535 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8536 | |
3dbd8c2e | 8537 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8538 | unregister_blkdev(mdp_major, "mdp"); |
8539 | unregister_reboot_notifier(&md_notifier); | |
8540 | unregister_sysctl_table(raid_table_header); | |
8541 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 8542 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8543 | export_array(mddev); |
d3374825 | 8544 | mddev->hold_active = 0; |
1da177e4 | 8545 | } |
e804ac78 TH |
8546 | destroy_workqueue(md_misc_wq); |
8547 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8548 | } |
8549 | ||
685784aa | 8550 | subsys_initcall(md_init); |
1da177e4 LT |
8551 | module_exit(md_exit) |
8552 | ||
f91de92e N |
8553 | static int get_ro(char *buffer, struct kernel_param *kp) |
8554 | { | |
8555 | return sprintf(buffer, "%d", start_readonly); | |
8556 | } | |
8557 | static int set_ro(const char *val, struct kernel_param *kp) | |
8558 | { | |
8559 | char *e; | |
8560 | int num = simple_strtoul(val, &e, 10); | |
8561 | if (*val && (*e == '\0' || *e == '\n')) { | |
8562 | start_readonly = num; | |
4dbcdc75 | 8563 | return 0; |
f91de92e N |
8564 | } |
8565 | return -EINVAL; | |
8566 | } | |
8567 | ||
80ca3a44 N |
8568 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8569 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 8570 | |
efeb53c0 | 8571 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8572 | |
1da177e4 LT |
8573 | EXPORT_SYMBOL(register_md_personality); |
8574 | EXPORT_SYMBOL(unregister_md_personality); | |
8575 | EXPORT_SYMBOL(md_error); | |
8576 | EXPORT_SYMBOL(md_done_sync); | |
8577 | EXPORT_SYMBOL(md_write_start); | |
8578 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
8579 | EXPORT_SYMBOL(md_register_thread); |
8580 | EXPORT_SYMBOL(md_unregister_thread); | |
8581 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
8582 | EXPORT_SYMBOL(md_check_recovery); |
8583 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8584 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8585 | MODULE_ALIAS("md"); |
72008652 | 8586 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |