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> |
2a48fc0a | 39 | #include <linux/mutex.h> |
1da177e4 | 40 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 41 | #include <linux/poll.h> |
16f17b39 | 42 | #include <linux/ctype.h> |
e7d2860b | 43 | #include <linux/string.h> |
fb4d8c76 N |
44 | #include <linux/hdreg.h> |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/random.h> | |
056075c7 | 47 | #include <linux/module.h> |
fb4d8c76 | 48 | #include <linux/reboot.h> |
32a7627c | 49 | #include <linux/file.h> |
aa98aa31 | 50 | #include <linux/compat.h> |
25570727 | 51 | #include <linux/delay.h> |
bff61975 N |
52 | #include <linux/raid/md_p.h> |
53 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 54 | #include <linux/slab.h> |
43b2e5d8 | 55 | #include "md.h" |
ef740c37 | 56 | #include "bitmap.h" |
1da177e4 | 57 | |
1da177e4 | 58 | #ifndef MODULE |
d710e138 | 59 | static void autostart_arrays(int part); |
1da177e4 LT |
60 | #endif |
61 | ||
01f96c0a N |
62 | /* pers_list is a list of registered personalities protected |
63 | * by pers_lock. | |
64 | * pers_lock does extra service to protect accesses to | |
65 | * mddev->thread when the mutex cannot be held. | |
66 | */ | |
2604b703 | 67 | static LIST_HEAD(pers_list); |
1da177e4 LT |
68 | static DEFINE_SPINLOCK(pers_lock); |
69 | ||
5e56341d AB |
70 | static void md_print_devices(void); |
71 | ||
90b08710 | 72 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
73 | static struct workqueue_struct *md_wq; |
74 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 75 | |
5e56341d AB |
76 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
77 | ||
1e50915f RB |
78 | /* |
79 | * Default number of read corrections we'll attempt on an rdev | |
80 | * before ejecting it from the array. We divide the read error | |
81 | * count by 2 for every hour elapsed between read errors. | |
82 | */ | |
83 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
84 | /* |
85 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
86 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
87 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 88 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
89 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
90 | * speed limit - in case reconstruction slows down your system despite | |
91 | * idle IO detection. | |
92 | * | |
93 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 94 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
95 | */ |
96 | ||
97 | static int sysctl_speed_limit_min = 1000; | |
98 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 99 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
100 | { |
101 | return mddev->sync_speed_min ? | |
102 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
103 | } | |
104 | ||
fd01b88c | 105 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
106 | { |
107 | return mddev->sync_speed_max ? | |
108 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
109 | } | |
1da177e4 LT |
110 | |
111 | static struct ctl_table_header *raid_table_header; | |
112 | ||
113 | static ctl_table raid_table[] = { | |
114 | { | |
1da177e4 LT |
115 | .procname = "speed_limit_min", |
116 | .data = &sysctl_speed_limit_min, | |
117 | .maxlen = sizeof(int), | |
80ca3a44 | 118 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 119 | .proc_handler = proc_dointvec, |
1da177e4 LT |
120 | }, |
121 | { | |
1da177e4 LT |
122 | .procname = "speed_limit_max", |
123 | .data = &sysctl_speed_limit_max, | |
124 | .maxlen = sizeof(int), | |
80ca3a44 | 125 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 126 | .proc_handler = proc_dointvec, |
1da177e4 | 127 | }, |
894d2491 | 128 | { } |
1da177e4 LT |
129 | }; |
130 | ||
131 | static ctl_table raid_dir_table[] = { | |
132 | { | |
1da177e4 LT |
133 | .procname = "raid", |
134 | .maxlen = 0, | |
80ca3a44 | 135 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
136 | .child = raid_table, |
137 | }, | |
894d2491 | 138 | { } |
1da177e4 LT |
139 | }; |
140 | ||
141 | static ctl_table raid_root_table[] = { | |
142 | { | |
1da177e4 LT |
143 | .procname = "dev", |
144 | .maxlen = 0, | |
145 | .mode = 0555, | |
146 | .child = raid_dir_table, | |
147 | }, | |
894d2491 | 148 | { } |
1da177e4 LT |
149 | }; |
150 | ||
83d5cde4 | 151 | static const struct block_device_operations md_fops; |
1da177e4 | 152 | |
f91de92e N |
153 | static int start_readonly; |
154 | ||
a167f663 N |
155 | /* bio_clone_mddev |
156 | * like bio_clone, but with a local bio set | |
157 | */ | |
158 | ||
159 | static void mddev_bio_destructor(struct bio *bio) | |
160 | { | |
fd01b88c | 161 | struct mddev *mddev, **mddevp; |
a167f663 N |
162 | |
163 | mddevp = (void*)bio; | |
164 | mddev = mddevp[-1]; | |
165 | ||
166 | bio_free(bio, mddev->bio_set); | |
167 | } | |
168 | ||
169 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, | |
fd01b88c | 170 | struct mddev *mddev) |
a167f663 N |
171 | { |
172 | struct bio *b; | |
fd01b88c | 173 | struct mddev **mddevp; |
a167f663 N |
174 | |
175 | if (!mddev || !mddev->bio_set) | |
176 | return bio_alloc(gfp_mask, nr_iovecs); | |
177 | ||
178 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, | |
179 | mddev->bio_set); | |
180 | if (!b) | |
181 | return NULL; | |
182 | mddevp = (void*)b; | |
183 | mddevp[-1] = mddev; | |
184 | b->bi_destructor = mddev_bio_destructor; | |
185 | return b; | |
186 | } | |
187 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
188 | ||
189 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 190 | struct mddev *mddev) |
a167f663 N |
191 | { |
192 | struct bio *b; | |
fd01b88c | 193 | struct mddev **mddevp; |
a167f663 N |
194 | |
195 | if (!mddev || !mddev->bio_set) | |
196 | return bio_clone(bio, gfp_mask); | |
197 | ||
198 | b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, | |
199 | mddev->bio_set); | |
200 | if (!b) | |
201 | return NULL; | |
202 | mddevp = (void*)b; | |
203 | mddevp[-1] = mddev; | |
204 | b->bi_destructor = mddev_bio_destructor; | |
205 | __bio_clone(b, bio); | |
206 | if (bio_integrity(bio)) { | |
207 | int ret; | |
208 | ||
209 | ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set); | |
210 | ||
211 | if (ret < 0) { | |
212 | bio_put(b); | |
213 | return NULL; | |
214 | } | |
215 | } | |
216 | ||
217 | return b; | |
218 | } | |
219 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
220 | ||
d2eb35ac N |
221 | void md_trim_bio(struct bio *bio, int offset, int size) |
222 | { | |
223 | /* 'bio' is a cloned bio which we need to trim to match | |
224 | * the given offset and size. | |
225 | * This requires adjusting bi_sector, bi_size, and bi_io_vec | |
226 | */ | |
227 | int i; | |
228 | struct bio_vec *bvec; | |
229 | int sofar = 0; | |
230 | ||
231 | size <<= 9; | |
232 | if (offset == 0 && size == bio->bi_size) | |
233 | return; | |
234 | ||
235 | bio->bi_sector += offset; | |
236 | bio->bi_size = size; | |
237 | offset <<= 9; | |
238 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
239 | ||
240 | while (bio->bi_idx < bio->bi_vcnt && | |
241 | bio->bi_io_vec[bio->bi_idx].bv_len <= offset) { | |
242 | /* remove this whole bio_vec */ | |
243 | offset -= bio->bi_io_vec[bio->bi_idx].bv_len; | |
244 | bio->bi_idx++; | |
245 | } | |
246 | if (bio->bi_idx < bio->bi_vcnt) { | |
247 | bio->bi_io_vec[bio->bi_idx].bv_offset += offset; | |
248 | bio->bi_io_vec[bio->bi_idx].bv_len -= offset; | |
249 | } | |
250 | /* avoid any complications with bi_idx being non-zero*/ | |
251 | if (bio->bi_idx) { | |
252 | memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx, | |
253 | (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec)); | |
254 | bio->bi_vcnt -= bio->bi_idx; | |
255 | bio->bi_idx = 0; | |
256 | } | |
257 | /* Make sure vcnt and last bv are not too big */ | |
258 | bio_for_each_segment(bvec, bio, i) { | |
259 | if (sofar + bvec->bv_len > size) | |
260 | bvec->bv_len = size - sofar; | |
261 | if (bvec->bv_len == 0) { | |
262 | bio->bi_vcnt = i; | |
263 | break; | |
264 | } | |
265 | sofar += bvec->bv_len; | |
266 | } | |
267 | } | |
268 | EXPORT_SYMBOL_GPL(md_trim_bio); | |
269 | ||
d7603b7e N |
270 | /* |
271 | * We have a system wide 'event count' that is incremented | |
272 | * on any 'interesting' event, and readers of /proc/mdstat | |
273 | * can use 'poll' or 'select' to find out when the event | |
274 | * count increases. | |
275 | * | |
276 | * Events are: | |
277 | * start array, stop array, error, add device, remove device, | |
278 | * start build, activate spare | |
279 | */ | |
2989ddbd | 280 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 281 | static atomic_t md_event_count; |
fd01b88c | 282 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
283 | { |
284 | atomic_inc(&md_event_count); | |
285 | wake_up(&md_event_waiters); | |
286 | } | |
29269553 | 287 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 288 | |
c331eb04 N |
289 | /* Alternate version that can be called from interrupts |
290 | * when calling sysfs_notify isn't needed. | |
291 | */ | |
fd01b88c | 292 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
293 | { |
294 | atomic_inc(&md_event_count); | |
295 | wake_up(&md_event_waiters); | |
296 | } | |
297 | ||
1da177e4 LT |
298 | /* |
299 | * Enables to iterate over all existing md arrays | |
300 | * all_mddevs_lock protects this list. | |
301 | */ | |
302 | static LIST_HEAD(all_mddevs); | |
303 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
304 | ||
305 | ||
306 | /* | |
307 | * iterates through all used mddevs in the system. | |
308 | * We take care to grab the all_mddevs_lock whenever navigating | |
309 | * the list, and to always hold a refcount when unlocked. | |
310 | * Any code which breaks out of this loop while own | |
311 | * a reference to the current mddev and must mddev_put it. | |
312 | */ | |
fd01b88c | 313 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 LT |
314 | \ |
315 | for (({ spin_lock(&all_mddevs_lock); \ | |
fd01b88c N |
316 | _tmp = all_mddevs.next; \ |
317 | _mddev = NULL;}); \ | |
318 | ({ if (_tmp != &all_mddevs) \ | |
319 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 320 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
321 | if (_mddev) mddev_put(_mddev); \ |
322 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
323 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 324 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 325 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
326 | ) |
327 | ||
328 | ||
409c57f3 N |
329 | /* Rather than calling directly into the personality make_request function, |
330 | * IO requests come here first so that we can check if the device is | |
331 | * being suspended pending a reconfiguration. | |
332 | * We hold a refcount over the call to ->make_request. By the time that | |
333 | * call has finished, the bio has been linked into some internal structure | |
334 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
335 | */ | |
5a7bbad2 | 336 | static void md_make_request(struct request_queue *q, struct bio *bio) |
1da177e4 | 337 | { |
49077326 | 338 | const int rw = bio_data_dir(bio); |
fd01b88c | 339 | struct mddev *mddev = q->queuedata; |
49077326 | 340 | int cpu; |
e91ece55 | 341 | unsigned int sectors; |
49077326 | 342 | |
0ca69886 N |
343 | if (mddev == NULL || mddev->pers == NULL |
344 | || !mddev->ready) { | |
409c57f3 | 345 | bio_io_error(bio); |
5a7bbad2 | 346 | return; |
409c57f3 | 347 | } |
0ca69886 | 348 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 349 | rcu_read_lock(); |
e9c7469b | 350 | if (mddev->suspended) { |
409c57f3 N |
351 | DEFINE_WAIT(__wait); |
352 | for (;;) { | |
353 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
354 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 355 | if (!mddev->suspended) |
409c57f3 N |
356 | break; |
357 | rcu_read_unlock(); | |
358 | schedule(); | |
359 | rcu_read_lock(); | |
360 | } | |
361 | finish_wait(&mddev->sb_wait, &__wait); | |
362 | } | |
363 | atomic_inc(&mddev->active_io); | |
364 | rcu_read_unlock(); | |
49077326 | 365 | |
e91ece55 CM |
366 | /* |
367 | * save the sectors now since our bio can | |
368 | * go away inside make_request | |
369 | */ | |
370 | sectors = bio_sectors(bio); | |
5a7bbad2 | 371 | mddev->pers->make_request(mddev, bio); |
49077326 N |
372 | |
373 | cpu = part_stat_lock(); | |
374 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
e91ece55 | 375 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); |
49077326 N |
376 | part_stat_unlock(); |
377 | ||
409c57f3 N |
378 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
379 | wake_up(&mddev->sb_wait); | |
409c57f3 N |
380 | } |
381 | ||
9e35b99c N |
382 | /* mddev_suspend makes sure no new requests are submitted |
383 | * to the device, and that any requests that have been submitted | |
384 | * are completely handled. | |
385 | * Once ->stop is called and completes, the module will be completely | |
386 | * unused. | |
387 | */ | |
fd01b88c | 388 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
389 | { |
390 | BUG_ON(mddev->suspended); | |
391 | mddev->suspended = 1; | |
392 | synchronize_rcu(); | |
393 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
394 | mddev->pers->quiesce(mddev, 1); | |
409c57f3 | 395 | } |
390ee602 | 396 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 397 | |
fd01b88c | 398 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
399 | { |
400 | mddev->suspended = 0; | |
401 | wake_up(&mddev->sb_wait); | |
402 | mddev->pers->quiesce(mddev, 0); | |
0fd018af JB |
403 | |
404 | md_wakeup_thread(mddev->thread); | |
405 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 406 | } |
390ee602 | 407 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 408 | |
fd01b88c | 409 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 N |
410 | { |
411 | return mddev->suspended; | |
412 | } | |
413 | EXPORT_SYMBOL(mddev_congested); | |
414 | ||
a2826aa9 | 415 | /* |
e9c7469b | 416 | * Generic flush handling for md |
a2826aa9 N |
417 | */ |
418 | ||
e9c7469b | 419 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 | 420 | { |
3cb03002 | 421 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 422 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
423 | |
424 | rdev_dec_pending(rdev, mddev); | |
425 | ||
426 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 427 | /* The pre-request flush has finished */ |
e804ac78 | 428 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
429 | } |
430 | bio_put(bio); | |
431 | } | |
432 | ||
a7a07e69 N |
433 | static void md_submit_flush_data(struct work_struct *ws); |
434 | ||
a035fc3e | 435 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 436 | { |
fd01b88c | 437 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 438 | struct md_rdev *rdev; |
a2826aa9 | 439 | |
a7a07e69 N |
440 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
441 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 N |
442 | rcu_read_lock(); |
443 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
444 | if (rdev->raid_disk >= 0 && | |
445 | !test_bit(Faulty, &rdev->flags)) { | |
446 | /* Take two references, one is dropped | |
447 | * when request finishes, one after | |
448 | * we reclaim rcu_read_lock | |
449 | */ | |
450 | struct bio *bi; | |
451 | atomic_inc(&rdev->nr_pending); | |
452 | atomic_inc(&rdev->nr_pending); | |
453 | rcu_read_unlock(); | |
a167f663 | 454 | bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev); |
e9c7469b | 455 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
456 | bi->bi_private = rdev; |
457 | bi->bi_bdev = rdev->bdev; | |
458 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 459 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
460 | rcu_read_lock(); |
461 | rdev_dec_pending(rdev, mddev); | |
462 | } | |
463 | rcu_read_unlock(); | |
a7a07e69 N |
464 | if (atomic_dec_and_test(&mddev->flush_pending)) |
465 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
466 | } |
467 | ||
e9c7469b | 468 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 469 | { |
fd01b88c | 470 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 471 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 472 | |
e9c7469b | 473 | if (bio->bi_size == 0) |
a2826aa9 N |
474 | /* an empty barrier - all done */ |
475 | bio_endio(bio, 0); | |
476 | else { | |
e9c7469b | 477 | bio->bi_rw &= ~REQ_FLUSH; |
5a7bbad2 | 478 | mddev->pers->make_request(mddev, bio); |
a2826aa9 | 479 | } |
2b74e12e N |
480 | |
481 | mddev->flush_bio = NULL; | |
482 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
483 | } |
484 | ||
fd01b88c | 485 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 N |
486 | { |
487 | spin_lock_irq(&mddev->write_lock); | |
488 | wait_event_lock_irq(mddev->sb_wait, | |
e9c7469b | 489 | !mddev->flush_bio, |
a2826aa9 | 490 | mddev->write_lock, /*nothing*/); |
e9c7469b | 491 | mddev->flush_bio = bio; |
a2826aa9 N |
492 | spin_unlock_irq(&mddev->write_lock); |
493 | ||
a035fc3e N |
494 | INIT_WORK(&mddev->flush_work, submit_flushes); |
495 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 496 | } |
e9c7469b | 497 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 498 | |
97658cdd N |
499 | /* Support for plugging. |
500 | * This mirrors the plugging support in request_queue, but does not | |
501 | * require having a whole queue or request structures. | |
502 | * We allocate an md_plug_cb for each md device and each thread it gets | |
503 | * plugged on. This links tot the private plug_handle structure in the | |
504 | * personality data where we keep a count of the number of outstanding | |
505 | * plugs so other code can see if a plug is active. | |
506 | */ | |
507 | struct md_plug_cb { | |
508 | struct blk_plug_cb cb; | |
fd01b88c | 509 | struct mddev *mddev; |
97658cdd N |
510 | }; |
511 | ||
512 | static void plugger_unplug(struct blk_plug_cb *cb) | |
513 | { | |
514 | struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb); | |
515 | if (atomic_dec_and_test(&mdcb->mddev->plug_cnt)) | |
516 | md_wakeup_thread(mdcb->mddev->thread); | |
517 | kfree(mdcb); | |
518 | } | |
519 | ||
520 | /* Check that an unplug wakeup will come shortly. | |
521 | * If not, wakeup the md thread immediately | |
522 | */ | |
fd01b88c | 523 | int mddev_check_plugged(struct mddev *mddev) |
97658cdd N |
524 | { |
525 | struct blk_plug *plug = current->plug; | |
526 | struct md_plug_cb *mdcb; | |
527 | ||
528 | if (!plug) | |
529 | return 0; | |
530 | ||
531 | list_for_each_entry(mdcb, &plug->cb_list, cb.list) { | |
532 | if (mdcb->cb.callback == plugger_unplug && | |
533 | mdcb->mddev == mddev) { | |
534 | /* Already on the list, move to top */ | |
535 | if (mdcb != list_first_entry(&plug->cb_list, | |
536 | struct md_plug_cb, | |
537 | cb.list)) | |
538 | list_move(&mdcb->cb.list, &plug->cb_list); | |
539 | return 1; | |
540 | } | |
541 | } | |
542 | /* Not currently on the callback list */ | |
543 | mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC); | |
544 | if (!mdcb) | |
545 | return 0; | |
546 | ||
547 | mdcb->mddev = mddev; | |
548 | mdcb->cb.callback = plugger_unplug; | |
549 | atomic_inc(&mddev->plug_cnt); | |
550 | list_add(&mdcb->cb.list, &plug->cb_list); | |
551 | return 1; | |
552 | } | |
553 | EXPORT_SYMBOL_GPL(mddev_check_plugged); | |
2ac87401 | 554 | |
fd01b88c | 555 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
556 | { |
557 | atomic_inc(&mddev->active); | |
558 | return mddev; | |
559 | } | |
560 | ||
5fd3a17e | 561 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 562 | |
fd01b88c | 563 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 564 | { |
a167f663 N |
565 | struct bio_set *bs = NULL; |
566 | ||
1da177e4 LT |
567 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
568 | return; | |
d3374825 | 569 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
570 | mddev->ctime == 0 && !mddev->hold_active) { |
571 | /* Array is not configured at all, and not held active, | |
572 | * so destroy it */ | |
af8a2434 | 573 | list_del_init(&mddev->all_mddevs); |
a167f663 N |
574 | bs = mddev->bio_set; |
575 | mddev->bio_set = NULL; | |
d3374825 | 576 | if (mddev->gendisk) { |
e804ac78 TH |
577 | /* We did a probe so need to clean up. Call |
578 | * queue_work inside the spinlock so that | |
579 | * flush_workqueue() after mddev_find will | |
580 | * succeed in waiting for the work to be done. | |
d3374825 N |
581 | */ |
582 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 583 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
584 | } else |
585 | kfree(mddev); | |
586 | } | |
587 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
588 | if (bs) |
589 | bioset_free(bs); | |
1da177e4 LT |
590 | } |
591 | ||
fd01b88c | 592 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
593 | { |
594 | mutex_init(&mddev->open_mutex); | |
595 | mutex_init(&mddev->reconfig_mutex); | |
596 | mutex_init(&mddev->bitmap_info.mutex); | |
597 | INIT_LIST_HEAD(&mddev->disks); | |
598 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
599 | init_timer(&mddev->safemode_timer); | |
600 | atomic_set(&mddev->active, 1); | |
601 | atomic_set(&mddev->openers, 0); | |
602 | atomic_set(&mddev->active_io, 0); | |
97658cdd | 603 | atomic_set(&mddev->plug_cnt, 0); |
fafd7fb0 N |
604 | spin_lock_init(&mddev->write_lock); |
605 | atomic_set(&mddev->flush_pending, 0); | |
606 | init_waitqueue_head(&mddev->sb_wait); | |
607 | init_waitqueue_head(&mddev->recovery_wait); | |
608 | mddev->reshape_position = MaxSector; | |
609 | mddev->resync_min = 0; | |
610 | mddev->resync_max = MaxSector; | |
611 | mddev->level = LEVEL_NONE; | |
612 | } | |
390ee602 | 613 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 614 | |
fd01b88c | 615 | static struct mddev * mddev_find(dev_t unit) |
1da177e4 | 616 | { |
fd01b88c | 617 | struct mddev *mddev, *new = NULL; |
1da177e4 | 618 | |
8f5f02c4 N |
619 | if (unit && MAJOR(unit) != MD_MAJOR) |
620 | unit &= ~((1<<MdpMinorShift)-1); | |
621 | ||
1da177e4 LT |
622 | retry: |
623 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
624 | |
625 | if (unit) { | |
626 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
627 | if (mddev->unit == unit) { | |
628 | mddev_get(mddev); | |
629 | spin_unlock(&all_mddevs_lock); | |
630 | kfree(new); | |
631 | return mddev; | |
632 | } | |
633 | ||
634 | if (new) { | |
635 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 636 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
637 | new->hold_active = UNTIL_IOCTL; |
638 | return new; | |
1da177e4 | 639 | } |
efeb53c0 N |
640 | } else if (new) { |
641 | /* find an unused unit number */ | |
642 | static int next_minor = 512; | |
643 | int start = next_minor; | |
644 | int is_free = 0; | |
645 | int dev = 0; | |
646 | while (!is_free) { | |
647 | dev = MKDEV(MD_MAJOR, next_minor); | |
648 | next_minor++; | |
649 | if (next_minor > MINORMASK) | |
650 | next_minor = 0; | |
651 | if (next_minor == start) { | |
652 | /* Oh dear, all in use. */ | |
653 | spin_unlock(&all_mddevs_lock); | |
654 | kfree(new); | |
655 | return NULL; | |
656 | } | |
657 | ||
658 | is_free = 1; | |
659 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
660 | if (mddev->unit == dev) { | |
661 | is_free = 0; | |
662 | break; | |
663 | } | |
664 | } | |
665 | new->unit = dev; | |
666 | new->md_minor = MINOR(dev); | |
667 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
668 | list_add(&new->all_mddevs, &all_mddevs); |
669 | spin_unlock(&all_mddevs_lock); | |
670 | return new; | |
671 | } | |
672 | spin_unlock(&all_mddevs_lock); | |
673 | ||
9ffae0cf | 674 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
675 | if (!new) |
676 | return NULL; | |
677 | ||
1da177e4 LT |
678 | new->unit = unit; |
679 | if (MAJOR(unit) == MD_MAJOR) | |
680 | new->md_minor = MINOR(unit); | |
681 | else | |
682 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
683 | ||
fafd7fb0 | 684 | mddev_init(new); |
1da177e4 | 685 | |
1da177e4 LT |
686 | goto retry; |
687 | } | |
688 | ||
fd01b88c | 689 | static inline int mddev_lock(struct mddev * mddev) |
1da177e4 | 690 | { |
df5b89b3 | 691 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
692 | } |
693 | ||
fd01b88c | 694 | static inline int mddev_is_locked(struct mddev *mddev) |
b522adcd DW |
695 | { |
696 | return mutex_is_locked(&mddev->reconfig_mutex); | |
697 | } | |
698 | ||
fd01b88c | 699 | static inline int mddev_trylock(struct mddev * mddev) |
1da177e4 | 700 | { |
df5b89b3 | 701 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
702 | } |
703 | ||
b6eb127d N |
704 | static struct attribute_group md_redundancy_group; |
705 | ||
fd01b88c | 706 | static void mddev_unlock(struct mddev * mddev) |
1da177e4 | 707 | { |
a64c876f | 708 | if (mddev->to_remove) { |
b6eb127d N |
709 | /* These cannot be removed under reconfig_mutex as |
710 | * an access to the files will try to take reconfig_mutex | |
711 | * while holding the file unremovable, which leads to | |
712 | * a deadlock. | |
bb4f1e9d N |
713 | * So hold set sysfs_active while the remove in happeing, |
714 | * and anything else which might set ->to_remove or my | |
715 | * otherwise change the sysfs namespace will fail with | |
716 | * -EBUSY if sysfs_active is still set. | |
717 | * We set sysfs_active under reconfig_mutex and elsewhere | |
718 | * test it under the same mutex to ensure its correct value | |
719 | * is seen. | |
b6eb127d | 720 | */ |
a64c876f N |
721 | struct attribute_group *to_remove = mddev->to_remove; |
722 | mddev->to_remove = NULL; | |
bb4f1e9d | 723 | mddev->sysfs_active = 1; |
b6eb127d N |
724 | mutex_unlock(&mddev->reconfig_mutex); |
725 | ||
00bcb4ac N |
726 | if (mddev->kobj.sd) { |
727 | if (to_remove != &md_redundancy_group) | |
728 | sysfs_remove_group(&mddev->kobj, to_remove); | |
729 | if (mddev->pers == NULL || | |
730 | mddev->pers->sync_request == NULL) { | |
731 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
732 | if (mddev->sysfs_action) | |
733 | sysfs_put(mddev->sysfs_action); | |
734 | mddev->sysfs_action = NULL; | |
735 | } | |
a64c876f | 736 | } |
bb4f1e9d | 737 | mddev->sysfs_active = 0; |
b6eb127d N |
738 | } else |
739 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 740 | |
751e67ca CD |
741 | /* As we've dropped the mutex we need a spinlock to |
742 | * make sure the thread doesn't disappear | |
01f96c0a N |
743 | */ |
744 | spin_lock(&pers_lock); | |
005eca5e | 745 | md_wakeup_thread(mddev->thread); |
01f96c0a | 746 | spin_unlock(&pers_lock); |
1da177e4 LT |
747 | } |
748 | ||
fd01b88c | 749 | static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr) |
1da177e4 | 750 | { |
3cb03002 | 751 | struct md_rdev *rdev; |
1da177e4 | 752 | |
159ec1fc | 753 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
754 | if (rdev->desc_nr == nr) |
755 | return rdev; | |
159ec1fc | 756 | |
1da177e4 LT |
757 | return NULL; |
758 | } | |
759 | ||
fd01b88c | 760 | static struct md_rdev * find_rdev(struct mddev * mddev, dev_t dev) |
1da177e4 | 761 | { |
3cb03002 | 762 | struct md_rdev *rdev; |
1da177e4 | 763 | |
159ec1fc | 764 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
765 | if (rdev->bdev->bd_dev == dev) |
766 | return rdev; | |
159ec1fc | 767 | |
1da177e4 LT |
768 | return NULL; |
769 | } | |
770 | ||
84fc4b56 | 771 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 772 | { |
84fc4b56 | 773 | struct md_personality *pers; |
d9d166c2 N |
774 | list_for_each_entry(pers, &pers_list, list) { |
775 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 776 | return pers; |
d9d166c2 N |
777 | if (strcmp(pers->name, clevel)==0) |
778 | return pers; | |
779 | } | |
2604b703 N |
780 | return NULL; |
781 | } | |
782 | ||
b73df2d3 | 783 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 784 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 785 | { |
57b2caa3 | 786 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 787 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
788 | } |
789 | ||
3cb03002 | 790 | static int alloc_disk_sb(struct md_rdev * rdev) |
1da177e4 LT |
791 | { |
792 | if (rdev->sb_page) | |
793 | MD_BUG(); | |
794 | ||
795 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
796 | if (!rdev->sb_page) { | |
797 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 798 | return -ENOMEM; |
1da177e4 LT |
799 | } |
800 | ||
801 | return 0; | |
802 | } | |
803 | ||
3cb03002 | 804 | static void free_disk_sb(struct md_rdev * rdev) |
1da177e4 LT |
805 | { |
806 | if (rdev->sb_page) { | |
2d1f3b5d | 807 | put_page(rdev->sb_page); |
1da177e4 LT |
808 | rdev->sb_loaded = 0; |
809 | rdev->sb_page = NULL; | |
0f420358 | 810 | rdev->sb_start = 0; |
dd8ac336 | 811 | rdev->sectors = 0; |
1da177e4 | 812 | } |
2699b672 N |
813 | if (rdev->bb_page) { |
814 | put_page(rdev->bb_page); | |
815 | rdev->bb_page = NULL; | |
816 | } | |
1da177e4 LT |
817 | } |
818 | ||
819 | ||
6712ecf8 | 820 | static void super_written(struct bio *bio, int error) |
7bfa19f2 | 821 | { |
3cb03002 | 822 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 823 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 824 | |
3a0f5bbb N |
825 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
826 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
827 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
828 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 829 | md_error(mddev, rdev); |
3a0f5bbb | 830 | } |
7bfa19f2 | 831 | |
a9701a30 N |
832 | if (atomic_dec_and_test(&mddev->pending_writes)) |
833 | wake_up(&mddev->sb_wait); | |
f8b58edf | 834 | bio_put(bio); |
7bfa19f2 N |
835 | } |
836 | ||
fd01b88c | 837 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
838 | sector_t sector, int size, struct page *page) |
839 | { | |
840 | /* write first size bytes of page to sector of rdev | |
841 | * Increment mddev->pending_writes before returning | |
842 | * and decrement it on completion, waking up sb_wait | |
843 | * if zero is reached. | |
844 | * If an error occurred, call md_error | |
845 | */ | |
a167f663 | 846 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 847 | |
a6ff7e08 | 848 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
7bfa19f2 N |
849 | bio->bi_sector = sector; |
850 | bio_add_page(bio, page, size, 0); | |
851 | bio->bi_private = rdev; | |
852 | bio->bi_end_io = super_written; | |
a9701a30 | 853 | |
7bfa19f2 | 854 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 855 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
856 | } |
857 | ||
fd01b88c | 858 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 859 | { |
e9c7469b | 860 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
861 | DEFINE_WAIT(wq); |
862 | for(;;) { | |
863 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
864 | if (atomic_read(&mddev->pending_writes)==0) | |
865 | break; | |
a9701a30 N |
866 | schedule(); |
867 | } | |
868 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
869 | } |
870 | ||
6712ecf8 | 871 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 872 | { |
1da177e4 | 873 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
874 | } |
875 | ||
3cb03002 | 876 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 877 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 878 | { |
a167f663 | 879 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
880 | struct completion event; |
881 | int ret; | |
882 | ||
721a9602 | 883 | rw |= REQ_SYNC; |
1da177e4 | 884 | |
a6ff7e08 JB |
885 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
886 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 JB |
887 | if (metadata_op) |
888 | bio->bi_sector = sector + rdev->sb_start; | |
889 | else | |
890 | bio->bi_sector = sector + rdev->data_offset; | |
1da177e4 LT |
891 | bio_add_page(bio, page, size, 0); |
892 | init_completion(&event); | |
893 | bio->bi_private = &event; | |
894 | bio->bi_end_io = bi_complete; | |
895 | submit_bio(rw, bio); | |
896 | wait_for_completion(&event); | |
897 | ||
898 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
899 | bio_put(bio); | |
900 | return ret; | |
901 | } | |
a8745db2 | 902 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 903 | |
3cb03002 | 904 | static int read_disk_sb(struct md_rdev * rdev, int size) |
1da177e4 LT |
905 | { |
906 | char b[BDEVNAME_SIZE]; | |
907 | if (!rdev->sb_page) { | |
908 | MD_BUG(); | |
909 | return -EINVAL; | |
910 | } | |
911 | if (rdev->sb_loaded) | |
912 | return 0; | |
913 | ||
914 | ||
ccebd4c4 | 915 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
916 | goto fail; |
917 | rdev->sb_loaded = 1; | |
918 | return 0; | |
919 | ||
920 | fail: | |
921 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
922 | bdevname(rdev->bdev,b)); | |
923 | return -EINVAL; | |
924 | } | |
925 | ||
926 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
927 | { | |
05710466 AN |
928 | return sb1->set_uuid0 == sb2->set_uuid0 && |
929 | sb1->set_uuid1 == sb2->set_uuid1 && | |
930 | sb1->set_uuid2 == sb2->set_uuid2 && | |
931 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
932 | } |
933 | ||
1da177e4 LT |
934 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
935 | { | |
936 | int ret; | |
937 | mdp_super_t *tmp1, *tmp2; | |
938 | ||
939 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
940 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
941 | ||
942 | if (!tmp1 || !tmp2) { | |
943 | ret = 0; | |
35020f1a | 944 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
945 | goto abort; |
946 | } | |
947 | ||
948 | *tmp1 = *sb1; | |
949 | *tmp2 = *sb2; | |
950 | ||
951 | /* | |
952 | * nr_disks is not constant | |
953 | */ | |
954 | tmp1->nr_disks = 0; | |
955 | tmp2->nr_disks = 0; | |
956 | ||
ce0c8e05 | 957 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 958 | abort: |
990a8baf JJ |
959 | kfree(tmp1); |
960 | kfree(tmp2); | |
1da177e4 LT |
961 | return ret; |
962 | } | |
963 | ||
4d167f09 N |
964 | |
965 | static u32 md_csum_fold(u32 csum) | |
966 | { | |
967 | csum = (csum & 0xffff) + (csum >> 16); | |
968 | return (csum & 0xffff) + (csum >> 16); | |
969 | } | |
970 | ||
1da177e4 LT |
971 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
972 | { | |
4d167f09 N |
973 | u64 newcsum = 0; |
974 | u32 *sb32 = (u32*)sb; | |
975 | int i; | |
1da177e4 LT |
976 | unsigned int disk_csum, csum; |
977 | ||
978 | disk_csum = sb->sb_csum; | |
979 | sb->sb_csum = 0; | |
4d167f09 N |
980 | |
981 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
982 | newcsum += sb32[i]; | |
983 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
984 | ||
985 | ||
986 | #ifdef CONFIG_ALPHA | |
987 | /* This used to use csum_partial, which was wrong for several | |
988 | * reasons including that different results are returned on | |
989 | * different architectures. It isn't critical that we get exactly | |
990 | * the same return value as before (we always csum_fold before | |
991 | * testing, and that removes any differences). However as we | |
992 | * know that csum_partial always returned a 16bit value on | |
993 | * alphas, do a fold to maximise conformity to previous behaviour. | |
994 | */ | |
995 | sb->sb_csum = md_csum_fold(disk_csum); | |
996 | #else | |
1da177e4 | 997 | sb->sb_csum = disk_csum; |
4d167f09 | 998 | #endif |
1da177e4 LT |
999 | return csum; |
1000 | } | |
1001 | ||
1002 | ||
1003 | /* | |
1004 | * Handle superblock details. | |
1005 | * We want to be able to handle multiple superblock formats | |
1006 | * so we have a common interface to them all, and an array of | |
1007 | * different handlers. | |
1008 | * We rely on user-space to write the initial superblock, and support | |
1009 | * reading and updating of superblocks. | |
1010 | * Interface methods are: | |
3cb03002 | 1011 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1012 | * loads and validates a superblock on dev. |
1013 | * if refdev != NULL, compare superblocks on both devices | |
1014 | * Return: | |
1015 | * 0 - dev has a superblock that is compatible with refdev | |
1016 | * 1 - dev has a superblock that is compatible and newer than refdev | |
1017 | * so dev should be used as the refdev in future | |
1018 | * -EINVAL superblock incompatible or invalid | |
1019 | * -othererror e.g. -EIO | |
1020 | * | |
fd01b88c | 1021 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
1022 | * Verify that dev is acceptable into mddev. |
1023 | * The first time, mddev->raid_disks will be 0, and data from | |
1024 | * dev should be merged in. Subsequent calls check that dev | |
1025 | * is new enough. Return 0 or -EINVAL | |
1026 | * | |
fd01b88c | 1027 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
1028 | * Update the superblock for rdev with data in mddev |
1029 | * This does not write to disc. | |
1030 | * | |
1031 | */ | |
1032 | ||
1033 | struct super_type { | |
0cd17fec CW |
1034 | char *name; |
1035 | struct module *owner; | |
3cb03002 | 1036 | int (*load_super)(struct md_rdev *rdev, struct md_rdev *refdev, |
0cd17fec | 1037 | int minor_version); |
fd01b88c N |
1038 | int (*validate_super)(struct mddev *mddev, struct md_rdev *rdev); |
1039 | void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); | |
3cb03002 | 1040 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 1041 | sector_t num_sectors); |
1da177e4 LT |
1042 | }; |
1043 | ||
0894cc30 AN |
1044 | /* |
1045 | * Check that the given mddev has no bitmap. | |
1046 | * | |
1047 | * This function is called from the run method of all personalities that do not | |
1048 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
1049 | * has a bitmap. Otherwise, it returns 0. | |
1050 | * | |
1051 | */ | |
fd01b88c | 1052 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 1053 | { |
c3d9714e | 1054 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
1055 | return 0; |
1056 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
1057 | mdname(mddev), mddev->pers->name); | |
1058 | return 1; | |
1059 | } | |
1060 | EXPORT_SYMBOL(md_check_no_bitmap); | |
1061 | ||
1da177e4 LT |
1062 | /* |
1063 | * load_super for 0.90.0 | |
1064 | */ | |
3cb03002 | 1065 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1066 | { |
1067 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
1068 | mdp_super_t *sb; | |
1069 | int ret; | |
1da177e4 LT |
1070 | |
1071 | /* | |
0f420358 | 1072 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
1073 | * it's at the end of the disk. |
1074 | * | |
1075 | * It also happens to be a multiple of 4Kb. | |
1076 | */ | |
57b2caa3 | 1077 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 1078 | |
0002b271 | 1079 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
1080 | if (ret) return ret; |
1081 | ||
1082 | ret = -EINVAL; | |
1083 | ||
1084 | bdevname(rdev->bdev, b); | |
65a06f06 | 1085 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1086 | |
1087 | if (sb->md_magic != MD_SB_MAGIC) { | |
1088 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
1089 | b); | |
1090 | goto abort; | |
1091 | } | |
1092 | ||
1093 | if (sb->major_version != 0 || | |
f6705578 N |
1094 | sb->minor_version < 90 || |
1095 | sb->minor_version > 91) { | |
1da177e4 LT |
1096 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1097 | sb->major_version, sb->minor_version, | |
1098 | b); | |
1099 | goto abort; | |
1100 | } | |
1101 | ||
1102 | if (sb->raid_disks <= 0) | |
1103 | goto abort; | |
1104 | ||
4d167f09 | 1105 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1106 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1107 | b); | |
1108 | goto abort; | |
1109 | } | |
1110 | ||
1111 | rdev->preferred_minor = sb->md_minor; | |
1112 | rdev->data_offset = 0; | |
0002b271 | 1113 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1114 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1115 | |
1116 | if (sb->level == LEVEL_MULTIPATH) | |
1117 | rdev->desc_nr = -1; | |
1118 | else | |
1119 | rdev->desc_nr = sb->this_disk.number; | |
1120 | ||
9a7b2b0f | 1121 | if (!refdev) { |
1da177e4 | 1122 | ret = 1; |
9a7b2b0f | 1123 | } else { |
1da177e4 | 1124 | __u64 ev1, ev2; |
65a06f06 | 1125 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1126 | if (!uuid_equal(refsb, sb)) { |
1127 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1128 | b, bdevname(refdev->bdev,b2)); | |
1129 | goto abort; | |
1130 | } | |
1131 | if (!sb_equal(refsb, sb)) { | |
1132 | printk(KERN_WARNING "md: %s has same UUID" | |
1133 | " but different superblock to %s\n", | |
1134 | b, bdevname(refdev->bdev, b2)); | |
1135 | goto abort; | |
1136 | } | |
1137 | ev1 = md_event(sb); | |
1138 | ev2 = md_event(refsb); | |
1139 | if (ev1 > ev2) | |
1140 | ret = 1; | |
1141 | else | |
1142 | ret = 0; | |
1143 | } | |
8190e754 | 1144 | rdev->sectors = rdev->sb_start; |
27a7b260 N |
1145 | /* Limit to 4TB as metadata cannot record more than that */ |
1146 | if (rdev->sectors >= (2ULL << 32)) | |
1147 | rdev->sectors = (2ULL << 32) - 2; | |
1da177e4 | 1148 | |
27a7b260 | 1149 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1150 | /* "this cannot possibly happen" ... */ |
1151 | ret = -EINVAL; | |
1152 | ||
1da177e4 LT |
1153 | abort: |
1154 | return ret; | |
1155 | } | |
1156 | ||
1157 | /* | |
1158 | * validate_super for 0.90.0 | |
1159 | */ | |
fd01b88c | 1160 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1161 | { |
1162 | mdp_disk_t *desc; | |
65a06f06 | 1163 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1164 | __u64 ev1 = md_event(sb); |
1da177e4 | 1165 | |
41158c7e | 1166 | rdev->raid_disk = -1; |
c5d79adb N |
1167 | clear_bit(Faulty, &rdev->flags); |
1168 | clear_bit(In_sync, &rdev->flags); | |
1169 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1170 | |
1da177e4 LT |
1171 | if (mddev->raid_disks == 0) { |
1172 | mddev->major_version = 0; | |
1173 | mddev->minor_version = sb->minor_version; | |
1174 | mddev->patch_version = sb->patch_version; | |
e691063a | 1175 | mddev->external = 0; |
9d8f0363 | 1176 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1177 | mddev->ctime = sb->ctime; |
1178 | mddev->utime = sb->utime; | |
1179 | mddev->level = sb->level; | |
d9d166c2 | 1180 | mddev->clevel[0] = 0; |
1da177e4 LT |
1181 | mddev->layout = sb->layout; |
1182 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1183 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1184 | mddev->events = ev1; |
c3d9714e N |
1185 | mddev->bitmap_info.offset = 0; |
1186 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1187 | |
f6705578 N |
1188 | if (mddev->minor_version >= 91) { |
1189 | mddev->reshape_position = sb->reshape_position; | |
1190 | mddev->delta_disks = sb->delta_disks; | |
1191 | mddev->new_level = sb->new_level; | |
1192 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1193 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1194 | } else { |
1195 | mddev->reshape_position = MaxSector; | |
1196 | mddev->delta_disks = 0; | |
1197 | mddev->new_level = mddev->level; | |
1198 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1199 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1200 | } |
1201 | ||
1da177e4 LT |
1202 | if (sb->state & (1<<MD_SB_CLEAN)) |
1203 | mddev->recovery_cp = MaxSector; | |
1204 | else { | |
1205 | if (sb->events_hi == sb->cp_events_hi && | |
1206 | sb->events_lo == sb->cp_events_lo) { | |
1207 | mddev->recovery_cp = sb->recovery_cp; | |
1208 | } else | |
1209 | mddev->recovery_cp = 0; | |
1210 | } | |
1211 | ||
1212 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1213 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1214 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1215 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1216 | ||
1217 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1218 | |
1219 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1220 | mddev->bitmap_info.file == NULL) |
1221 | mddev->bitmap_info.offset = | |
1222 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1223 | |
41158c7e | 1224 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1225 | /* Insist on good event counter while assembling, except |
1226 | * for spares (which don't need an event count) */ | |
1da177e4 | 1227 | ++ev1; |
be6800a7 N |
1228 | if (sb->disks[rdev->desc_nr].state & ( |
1229 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1230 | if (ev1 < mddev->events) | |
1231 | return -EINVAL; | |
41158c7e N |
1232 | } else if (mddev->bitmap) { |
1233 | /* if adding to array with a bitmap, then we can accept an | |
1234 | * older device ... but not too old. | |
1235 | */ | |
41158c7e N |
1236 | if (ev1 < mddev->bitmap->events_cleared) |
1237 | return 0; | |
07d84d10 N |
1238 | } else { |
1239 | if (ev1 < mddev->events) | |
1240 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1241 | return 0; | |
1242 | } | |
41158c7e | 1243 | |
1da177e4 | 1244 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1245 | desc = sb->disks + rdev->desc_nr; |
1246 | ||
1247 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1248 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1249 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1250 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1251 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1252 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1253 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1254 | /* active but not in sync implies recovery up to | |
1255 | * reshape position. We don't know exactly where | |
1256 | * that is, so set to zero for now */ | |
1257 | if (mddev->minor_version >= 91) { | |
1258 | rdev->recovery_offset = 0; | |
1259 | rdev->raid_disk = desc->raid_disk; | |
1260 | } | |
1da177e4 | 1261 | } |
8ddf9efe N |
1262 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1263 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1264 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1265 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1266 | return 0; |
1267 | } | |
1268 | ||
1269 | /* | |
1270 | * sync_super for 0.90.0 | |
1271 | */ | |
fd01b88c | 1272 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1273 | { |
1274 | mdp_super_t *sb; | |
3cb03002 | 1275 | struct md_rdev *rdev2; |
1da177e4 | 1276 | int next_spare = mddev->raid_disks; |
19133a42 | 1277 | |
1da177e4 LT |
1278 | |
1279 | /* make rdev->sb match mddev data.. | |
1280 | * | |
1281 | * 1/ zero out disks | |
1282 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1283 | * 3/ any empty disks < next_spare become removed | |
1284 | * | |
1285 | * disks[0] gets initialised to REMOVED because | |
1286 | * we cannot be sure from other fields if it has | |
1287 | * been initialised or not. | |
1288 | */ | |
1289 | int i; | |
1290 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1291 | ||
61181565 N |
1292 | rdev->sb_size = MD_SB_BYTES; |
1293 | ||
65a06f06 | 1294 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1295 | |
1296 | memset(sb, 0, sizeof(*sb)); | |
1297 | ||
1298 | sb->md_magic = MD_SB_MAGIC; | |
1299 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1300 | sb->patch_version = mddev->patch_version; |
1301 | sb->gvalid_words = 0; /* ignored */ | |
1302 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1303 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1304 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1305 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1306 | ||
1307 | sb->ctime = mddev->ctime; | |
1308 | sb->level = mddev->level; | |
58c0fed4 | 1309 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1310 | sb->raid_disks = mddev->raid_disks; |
1311 | sb->md_minor = mddev->md_minor; | |
e691063a | 1312 | sb->not_persistent = 0; |
1da177e4 LT |
1313 | sb->utime = mddev->utime; |
1314 | sb->state = 0; | |
1315 | sb->events_hi = (mddev->events>>32); | |
1316 | sb->events_lo = (u32)mddev->events; | |
1317 | ||
f6705578 N |
1318 | if (mddev->reshape_position == MaxSector) |
1319 | sb->minor_version = 90; | |
1320 | else { | |
1321 | sb->minor_version = 91; | |
1322 | sb->reshape_position = mddev->reshape_position; | |
1323 | sb->new_level = mddev->new_level; | |
1324 | sb->delta_disks = mddev->delta_disks; | |
1325 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1326 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1327 | } |
1328 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1329 | if (mddev->in_sync) |
1330 | { | |
1331 | sb->recovery_cp = mddev->recovery_cp; | |
1332 | sb->cp_events_hi = (mddev->events>>32); | |
1333 | sb->cp_events_lo = (u32)mddev->events; | |
1334 | if (mddev->recovery_cp == MaxSector) | |
1335 | sb->state = (1<< MD_SB_CLEAN); | |
1336 | } else | |
1337 | sb->recovery_cp = 0; | |
1338 | ||
1339 | sb->layout = mddev->layout; | |
9d8f0363 | 1340 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1341 | |
c3d9714e | 1342 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1343 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1344 | ||
1da177e4 | 1345 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1346 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1347 | mdp_disk_t *d; |
86e6ffdd | 1348 | int desc_nr; |
0261cd9f N |
1349 | int is_active = test_bit(In_sync, &rdev2->flags); |
1350 | ||
1351 | if (rdev2->raid_disk >= 0 && | |
1352 | sb->minor_version >= 91) | |
1353 | /* we have nowhere to store the recovery_offset, | |
1354 | * but if it is not below the reshape_position, | |
1355 | * we can piggy-back on that. | |
1356 | */ | |
1357 | is_active = 1; | |
1358 | if (rdev2->raid_disk < 0 || | |
1359 | test_bit(Faulty, &rdev2->flags)) | |
1360 | is_active = 0; | |
1361 | if (is_active) | |
86e6ffdd | 1362 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1363 | else |
86e6ffdd | 1364 | desc_nr = next_spare++; |
19133a42 | 1365 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1366 | d = &sb->disks[rdev2->desc_nr]; |
1367 | nr_disks++; | |
1368 | d->number = rdev2->desc_nr; | |
1369 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1370 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1371 | if (is_active) |
1da177e4 LT |
1372 | d->raid_disk = rdev2->raid_disk; |
1373 | else | |
1374 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1375 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1376 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1377 | else if (is_active) { |
1da177e4 | 1378 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1379 | if (test_bit(In_sync, &rdev2->flags)) |
1380 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1381 | active++; |
1382 | working++; | |
1383 | } else { | |
1384 | d->state = 0; | |
1385 | spare++; | |
1386 | working++; | |
1387 | } | |
8ddf9efe N |
1388 | if (test_bit(WriteMostly, &rdev2->flags)) |
1389 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1390 | } |
1da177e4 LT |
1391 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1392 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1393 | mdp_disk_t *d = &sb->disks[i]; | |
1394 | if (d->state == 0 && d->number == 0) { | |
1395 | d->number = i; | |
1396 | d->raid_disk = i; | |
1397 | d->state = (1<<MD_DISK_REMOVED); | |
1398 | d->state |= (1<<MD_DISK_FAULTY); | |
1399 | failed++; | |
1400 | } | |
1401 | } | |
1402 | sb->nr_disks = nr_disks; | |
1403 | sb->active_disks = active; | |
1404 | sb->working_disks = working; | |
1405 | sb->failed_disks = failed; | |
1406 | sb->spare_disks = spare; | |
1407 | ||
1408 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1409 | sb->sb_csum = calc_sb_csum(sb); | |
1410 | } | |
1411 | ||
0cd17fec CW |
1412 | /* |
1413 | * rdev_size_change for 0.90.0 | |
1414 | */ | |
1415 | static unsigned long long | |
3cb03002 | 1416 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1417 | { |
58c0fed4 | 1418 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1419 | return 0; /* component must fit device */ |
c3d9714e | 1420 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1421 | return 0; /* can't move bitmap */ |
57b2caa3 | 1422 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1423 | if (!num_sectors || num_sectors > rdev->sb_start) |
1424 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1425 | /* Limit to 4TB as metadata cannot record more than that. |
1426 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1427 | */ | |
1428 | if (num_sectors >= (2ULL << 32)) | |
1429 | num_sectors = (2ULL << 32) - 2; | |
0f420358 | 1430 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1431 | rdev->sb_page); |
1432 | md_super_wait(rdev->mddev); | |
c26a44ed | 1433 | return num_sectors; |
0cd17fec CW |
1434 | } |
1435 | ||
1436 | ||
1da177e4 LT |
1437 | /* |
1438 | * version 1 superblock | |
1439 | */ | |
1440 | ||
1c05b4bc | 1441 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1442 | { |
1c05b4bc N |
1443 | __le32 disk_csum; |
1444 | u32 csum; | |
1da177e4 LT |
1445 | unsigned long long newcsum; |
1446 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1447 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1448 | int i; |
1449 | ||
1450 | disk_csum = sb->sb_csum; | |
1451 | sb->sb_csum = 0; | |
1452 | newcsum = 0; | |
1453 | for (i=0; size>=4; size -= 4 ) | |
1454 | newcsum += le32_to_cpu(*isuper++); | |
1455 | ||
1456 | if (size == 2) | |
1c05b4bc | 1457 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1458 | |
1459 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1460 | sb->sb_csum = disk_csum; | |
1461 | return cpu_to_le32(csum); | |
1462 | } | |
1463 | ||
2699b672 N |
1464 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1465 | int acknowledged); | |
3cb03002 | 1466 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1467 | { |
1468 | struct mdp_superblock_1 *sb; | |
1469 | int ret; | |
0f420358 | 1470 | sector_t sb_start; |
1da177e4 | 1471 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1472 | int bmask; |
1da177e4 LT |
1473 | |
1474 | /* | |
0f420358 | 1475 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1476 | * It is always aligned to a 4K boundary and |
1477 | * depeding on minor_version, it can be: | |
1478 | * 0: At least 8K, but less than 12K, from end of device | |
1479 | * 1: At start of device | |
1480 | * 2: 4K from start of device. | |
1481 | */ | |
1482 | switch(minor_version) { | |
1483 | case 0: | |
77304d2a | 1484 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1485 | sb_start -= 8*2; |
1486 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1487 | break; |
1488 | case 1: | |
0f420358 | 1489 | sb_start = 0; |
1da177e4 LT |
1490 | break; |
1491 | case 2: | |
0f420358 | 1492 | sb_start = 8; |
1da177e4 LT |
1493 | break; |
1494 | default: | |
1495 | return -EINVAL; | |
1496 | } | |
0f420358 | 1497 | rdev->sb_start = sb_start; |
1da177e4 | 1498 | |
0002b271 N |
1499 | /* superblock is rarely larger than 1K, but it can be larger, |
1500 | * and it is safe to read 4k, so we do that | |
1501 | */ | |
1502 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1503 | if (ret) return ret; |
1504 | ||
1505 | ||
65a06f06 | 1506 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1507 | |
1508 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1509 | sb->major_version != cpu_to_le32(1) || | |
1510 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1511 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1512 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1513 | return -EINVAL; |
1514 | ||
1515 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1516 | printk("md: invalid superblock checksum on %s\n", | |
1517 | bdevname(rdev->bdev,b)); | |
1518 | return -EINVAL; | |
1519 | } | |
1520 | if (le64_to_cpu(sb->data_size) < 10) { | |
1521 | printk("md: data_size too small on %s\n", | |
1522 | bdevname(rdev->bdev,b)); | |
1523 | return -EINVAL; | |
1524 | } | |
e11e93fa | 1525 | |
1da177e4 LT |
1526 | rdev->preferred_minor = 0xffff; |
1527 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1528 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1529 | |
0002b271 | 1530 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1531 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1532 | if (rdev->sb_size & bmask) |
a1801f85 N |
1533 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1534 | ||
1535 | if (minor_version | |
0f420358 | 1536 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1537 | return -EINVAL; |
0002b271 | 1538 | |
31b65a0d N |
1539 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1540 | rdev->desc_nr = -1; | |
1541 | else | |
1542 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1543 | ||
2699b672 N |
1544 | if (!rdev->bb_page) { |
1545 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1546 | if (!rdev->bb_page) | |
1547 | return -ENOMEM; | |
1548 | } | |
1549 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1550 | rdev->badblocks.count == 0) { | |
1551 | /* need to load the bad block list. | |
1552 | * Currently we limit it to one page. | |
1553 | */ | |
1554 | s32 offset; | |
1555 | sector_t bb_sector; | |
1556 | u64 *bbp; | |
1557 | int i; | |
1558 | int sectors = le16_to_cpu(sb->bblog_size); | |
1559 | if (sectors > (PAGE_SIZE / 512)) | |
1560 | return -EINVAL; | |
1561 | offset = le32_to_cpu(sb->bblog_offset); | |
1562 | if (offset == 0) | |
1563 | return -EINVAL; | |
1564 | bb_sector = (long long)offset; | |
1565 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1566 | rdev->bb_page, READ, true)) | |
1567 | return -EIO; | |
1568 | bbp = (u64 *)page_address(rdev->bb_page); | |
1569 | rdev->badblocks.shift = sb->bblog_shift; | |
1570 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1571 | u64 bb = le64_to_cpu(*bbp); | |
1572 | int count = bb & (0x3ff); | |
1573 | u64 sector = bb >> 10; | |
1574 | sector <<= sb->bblog_shift; | |
1575 | count <<= sb->bblog_shift; | |
1576 | if (bb + 1 == 0) | |
1577 | break; | |
1578 | if (md_set_badblocks(&rdev->badblocks, | |
1579 | sector, count, 1) == 0) | |
1580 | return -EINVAL; | |
1581 | } | |
1582 | } else if (sb->bblog_offset == 0) | |
1583 | rdev->badblocks.shift = -1; | |
1584 | ||
9a7b2b0f | 1585 | if (!refdev) { |
8ed75463 | 1586 | ret = 1; |
9a7b2b0f | 1587 | } else { |
1da177e4 | 1588 | __u64 ev1, ev2; |
65a06f06 | 1589 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1590 | |
1591 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1592 | sb->level != refsb->level || | |
1593 | sb->layout != refsb->layout || | |
1594 | sb->chunksize != refsb->chunksize) { | |
1595 | printk(KERN_WARNING "md: %s has strangely different" | |
1596 | " superblock to %s\n", | |
1597 | bdevname(rdev->bdev,b), | |
1598 | bdevname(refdev->bdev,b2)); | |
1599 | return -EINVAL; | |
1600 | } | |
1601 | ev1 = le64_to_cpu(sb->events); | |
1602 | ev2 = le64_to_cpu(refsb->events); | |
1603 | ||
1604 | if (ev1 > ev2) | |
8ed75463 N |
1605 | ret = 1; |
1606 | else | |
1607 | ret = 0; | |
1da177e4 | 1608 | } |
a1801f85 | 1609 | if (minor_version) |
77304d2a | 1610 | rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 1611 | le64_to_cpu(sb->data_offset); |
1da177e4 | 1612 | else |
dd8ac336 AN |
1613 | rdev->sectors = rdev->sb_start; |
1614 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1615 | return -EINVAL; |
dd8ac336 | 1616 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1617 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1618 | return -EINVAL; |
8ed75463 | 1619 | return ret; |
1da177e4 LT |
1620 | } |
1621 | ||
fd01b88c | 1622 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1623 | { |
65a06f06 | 1624 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1625 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1626 | |
41158c7e | 1627 | rdev->raid_disk = -1; |
c5d79adb N |
1628 | clear_bit(Faulty, &rdev->flags); |
1629 | clear_bit(In_sync, &rdev->flags); | |
1630 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1631 | |
1da177e4 LT |
1632 | if (mddev->raid_disks == 0) { |
1633 | mddev->major_version = 1; | |
1634 | mddev->patch_version = 0; | |
e691063a | 1635 | mddev->external = 0; |
9d8f0363 | 1636 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1637 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1638 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1639 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1640 | mddev->clevel[0] = 0; |
1da177e4 LT |
1641 | mddev->layout = le32_to_cpu(sb->layout); |
1642 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1643 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1644 | mddev->events = ev1; |
c3d9714e N |
1645 | mddev->bitmap_info.offset = 0; |
1646 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1647 | |
1648 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1649 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1650 | ||
1651 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1652 | |
71c0805c | 1653 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1654 | mddev->bitmap_info.file == NULL ) |
1655 | mddev->bitmap_info.offset = | |
1656 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1657 | |
f6705578 N |
1658 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1659 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1660 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1661 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1662 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1663 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1664 | } else { |
1665 | mddev->reshape_position = MaxSector; | |
1666 | mddev->delta_disks = 0; | |
1667 | mddev->new_level = mddev->level; | |
1668 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1669 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1670 | } |
1671 | ||
41158c7e | 1672 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1673 | /* Insist of good event counter while assembling, except for |
1674 | * spares (which don't need an event count) */ | |
1da177e4 | 1675 | ++ev1; |
be6800a7 N |
1676 | if (rdev->desc_nr >= 0 && |
1677 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1678 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1679 | if (ev1 < mddev->events) | |
1680 | return -EINVAL; | |
41158c7e N |
1681 | } else if (mddev->bitmap) { |
1682 | /* If adding to array with a bitmap, then we can accept an | |
1683 | * older device, but not too old. | |
1684 | */ | |
41158c7e N |
1685 | if (ev1 < mddev->bitmap->events_cleared) |
1686 | return 0; | |
07d84d10 N |
1687 | } else { |
1688 | if (ev1 < mddev->events) | |
1689 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1690 | return 0; | |
1691 | } | |
1da177e4 LT |
1692 | if (mddev->level != LEVEL_MULTIPATH) { |
1693 | int role; | |
3673f305 N |
1694 | if (rdev->desc_nr < 0 || |
1695 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1696 | role = 0xffff; | |
1697 | rdev->desc_nr = -1; | |
1698 | } else | |
1699 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1700 | switch(role) { |
1701 | case 0xffff: /* spare */ | |
1da177e4 LT |
1702 | break; |
1703 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1704 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1705 | break; |
1706 | default: | |
5fd6c1dc N |
1707 | if ((le32_to_cpu(sb->feature_map) & |
1708 | MD_FEATURE_RECOVERY_OFFSET)) | |
1709 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1710 | else | |
1711 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1712 | rdev->raid_disk = role; |
1713 | break; | |
1714 | } | |
8ddf9efe N |
1715 | if (sb->devflags & WriteMostly1) |
1716 | set_bit(WriteMostly, &rdev->flags); | |
2d78f8c4 N |
1717 | if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) |
1718 | set_bit(Replacement, &rdev->flags); | |
41158c7e | 1719 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1720 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1721 | |
1da177e4 LT |
1722 | return 0; |
1723 | } | |
1724 | ||
fd01b88c | 1725 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1726 | { |
1727 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1728 | struct md_rdev *rdev2; |
1da177e4 LT |
1729 | int max_dev, i; |
1730 | /* make rdev->sb match mddev and rdev data. */ | |
1731 | ||
65a06f06 | 1732 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1733 | |
1734 | sb->feature_map = 0; | |
1735 | sb->pad0 = 0; | |
5fd6c1dc | 1736 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 | 1737 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1da177e4 LT |
1738 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1739 | ||
1740 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1741 | sb->events = cpu_to_le64(mddev->events); | |
1742 | if (mddev->in_sync) | |
1743 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1744 | else | |
1745 | sb->resync_offset = cpu_to_le64(0); | |
1746 | ||
1c05b4bc | 1747 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1748 | |
f0ca340c | 1749 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1750 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1751 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1752 | sb->level = cpu_to_le32(mddev->level); |
1753 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1754 | |
aeb9b211 N |
1755 | if (test_bit(WriteMostly, &rdev->flags)) |
1756 | sb->devflags |= WriteMostly1; | |
1757 | else | |
1758 | sb->devflags &= ~WriteMostly1; | |
1759 | ||
c3d9714e N |
1760 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1761 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1762 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1763 | } |
5fd6c1dc N |
1764 | |
1765 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1766 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1767 | sb->feature_map |= |
1768 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1769 | sb->recovery_offset = | |
1770 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc | 1771 | } |
2d78f8c4 N |
1772 | if (test_bit(Replacement, &rdev->flags)) |
1773 | sb->feature_map |= | |
1774 | cpu_to_le32(MD_FEATURE_REPLACEMENT); | |
5fd6c1dc | 1775 | |
f6705578 N |
1776 | if (mddev->reshape_position != MaxSector) { |
1777 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1778 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1779 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1780 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1781 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1782 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1783 | } |
a654b9d8 | 1784 | |
2699b672 N |
1785 | if (rdev->badblocks.count == 0) |
1786 | /* Nothing to do for bad blocks*/ ; | |
1787 | else if (sb->bblog_offset == 0) | |
1788 | /* Cannot record bad blocks on this device */ | |
1789 | md_error(mddev, rdev); | |
1790 | else { | |
1791 | struct badblocks *bb = &rdev->badblocks; | |
1792 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1793 | u64 *p = bb->page; | |
1794 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1795 | if (bb->changed) { | |
1796 | unsigned seq; | |
1797 | ||
1798 | retry: | |
1799 | seq = read_seqbegin(&bb->lock); | |
1800 | ||
1801 | memset(bbp, 0xff, PAGE_SIZE); | |
1802 | ||
1803 | for (i = 0 ; i < bb->count ; i++) { | |
1804 | u64 internal_bb = *p++; | |
1805 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) | |
1806 | | BB_LEN(internal_bb)); | |
1807 | *bbp++ = cpu_to_le64(store_bb); | |
1808 | } | |
1809 | if (read_seqretry(&bb->lock, seq)) | |
1810 | goto retry; | |
1811 | ||
1812 | bb->sector = (rdev->sb_start + | |
1813 | (int)le32_to_cpu(sb->bblog_offset)); | |
1814 | bb->size = le16_to_cpu(sb->bblog_size); | |
1815 | bb->changed = 0; | |
1816 | } | |
1817 | } | |
1818 | ||
1da177e4 | 1819 | max_dev = 0; |
159ec1fc | 1820 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1821 | if (rdev2->desc_nr+1 > max_dev) |
1822 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1823 | |
70471daf N |
1824 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1825 | int bmask; | |
a778b73f | 1826 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1827 | rdev->sb_size = max_dev * 2 + 256; |
1828 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1829 | if (rdev->sb_size & bmask) | |
1830 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1831 | } else |
1832 | max_dev = le32_to_cpu(sb->max_dev); | |
1833 | ||
1da177e4 LT |
1834 | for (i=0; i<max_dev;i++) |
1835 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1836 | ||
159ec1fc | 1837 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1838 | i = rdev2->desc_nr; |
b2d444d7 | 1839 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1840 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1841 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1842 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1843 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1844 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1845 | else |
1846 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1847 | } | |
1848 | ||
1da177e4 LT |
1849 | sb->sb_csum = calc_sb_1_csum(sb); |
1850 | } | |
1851 | ||
0cd17fec | 1852 | static unsigned long long |
3cb03002 | 1853 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1854 | { |
1855 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1856 | sector_t max_sectors; |
58c0fed4 | 1857 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1858 | return 0; /* component must fit device */ |
0f420358 | 1859 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1860 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1861 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1862 | max_sectors -= rdev->data_offset; |
1863 | if (!num_sectors || num_sectors > max_sectors) | |
1864 | num_sectors = max_sectors; | |
c3d9714e | 1865 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1866 | /* minor version 0 with bitmap we can't move */ |
1867 | return 0; | |
1868 | } else { | |
1869 | /* minor version 0; superblock after data */ | |
0f420358 | 1870 | sector_t sb_start; |
77304d2a | 1871 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1872 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1873 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1874 | if (!num_sectors || num_sectors > max_sectors) |
1875 | num_sectors = max_sectors; | |
0f420358 | 1876 | rdev->sb_start = sb_start; |
0cd17fec | 1877 | } |
65a06f06 | 1878 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1879 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1880 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1881 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1882 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1883 | rdev->sb_page); |
1884 | md_super_wait(rdev->mddev); | |
c26a44ed | 1885 | return num_sectors; |
0cd17fec | 1886 | } |
1da177e4 | 1887 | |
75c96f85 | 1888 | static struct super_type super_types[] = { |
1da177e4 LT |
1889 | [0] = { |
1890 | .name = "0.90.0", | |
1891 | .owner = THIS_MODULE, | |
0cd17fec CW |
1892 | .load_super = super_90_load, |
1893 | .validate_super = super_90_validate, | |
1894 | .sync_super = super_90_sync, | |
1895 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1896 | }, |
1897 | [1] = { | |
1898 | .name = "md-1", | |
1899 | .owner = THIS_MODULE, | |
0cd17fec CW |
1900 | .load_super = super_1_load, |
1901 | .validate_super = super_1_validate, | |
1902 | .sync_super = super_1_sync, | |
1903 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1904 | }, |
1905 | }; | |
1da177e4 | 1906 | |
fd01b88c | 1907 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1908 | { |
1909 | if (mddev->sync_super) { | |
1910 | mddev->sync_super(mddev, rdev); | |
1911 | return; | |
1912 | } | |
1913 | ||
1914 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1915 | ||
1916 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1917 | } | |
1918 | ||
fd01b88c | 1919 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1920 | { |
3cb03002 | 1921 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1922 | |
4b80991c N |
1923 | rcu_read_lock(); |
1924 | rdev_for_each_rcu(rdev, mddev1) | |
1925 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1926 | if (rdev->bdev->bd_contains == |
4b80991c N |
1927 | rdev2->bdev->bd_contains) { |
1928 | rcu_read_unlock(); | |
7dd5e7c3 | 1929 | return 1; |
4b80991c N |
1930 | } |
1931 | rcu_read_unlock(); | |
1da177e4 LT |
1932 | return 0; |
1933 | } | |
1934 | ||
1935 | static LIST_HEAD(pending_raid_disks); | |
1936 | ||
ac5e7113 AN |
1937 | /* |
1938 | * Try to register data integrity profile for an mddev | |
1939 | * | |
1940 | * This is called when an array is started and after a disk has been kicked | |
1941 | * from the array. It only succeeds if all working and active component devices | |
1942 | * are integrity capable with matching profiles. | |
1943 | */ | |
fd01b88c | 1944 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1945 | { |
3cb03002 | 1946 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1947 | |
1948 | if (list_empty(&mddev->disks)) | |
1949 | return 0; /* nothing to do */ | |
629acb6a JB |
1950 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1951 | return 0; /* shouldn't register, or already is */ | |
ac5e7113 AN |
1952 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1953 | /* skip spares and non-functional disks */ | |
1954 | if (test_bit(Faulty, &rdev->flags)) | |
1955 | continue; | |
1956 | if (rdev->raid_disk < 0) | |
1957 | continue; | |
ac5e7113 AN |
1958 | if (!reference) { |
1959 | /* Use the first rdev as the reference */ | |
1960 | reference = rdev; | |
1961 | continue; | |
1962 | } | |
1963 | /* does this rdev's profile match the reference profile? */ | |
1964 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1965 | rdev->bdev->bd_disk) < 0) | |
1966 | return -EINVAL; | |
1967 | } | |
89078d57 MP |
1968 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1969 | return 0; | |
ac5e7113 AN |
1970 | /* |
1971 | * All component devices are integrity capable and have matching | |
1972 | * profiles, register the common profile for the md device. | |
1973 | */ | |
1974 | if (blk_integrity_register(mddev->gendisk, | |
1975 | bdev_get_integrity(reference->bdev)) != 0) { | |
1976 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1977 | mdname(mddev)); | |
1978 | return -EINVAL; | |
1979 | } | |
a91a2785 MP |
1980 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
1981 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
1982 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
1983 | mdname(mddev)); | |
1984 | return -EINVAL; | |
1985 | } | |
ac5e7113 AN |
1986 | return 0; |
1987 | } | |
1988 | EXPORT_SYMBOL(md_integrity_register); | |
1989 | ||
1990 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 1991 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 1992 | { |
3f9d99c1 | 1993 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1994 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1995 | |
ac5e7113 | 1996 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1997 | return; |
ac5e7113 | 1998 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1999 | return; |
ac5e7113 AN |
2000 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
2001 | rdev->bdev->bd_disk) >= 0) | |
2002 | return; | |
2003 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2004 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2005 | } |
ac5e7113 | 2006 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2007 | |
fd01b88c | 2008 | static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev) |
1da177e4 | 2009 | { |
7dd5e7c3 | 2010 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2011 | struct kobject *ko; |
1edf80d3 | 2012 | char *s; |
5e55e2f5 | 2013 | int err; |
1da177e4 LT |
2014 | |
2015 | if (rdev->mddev) { | |
2016 | MD_BUG(); | |
2017 | return -EINVAL; | |
2018 | } | |
11e2ede0 DW |
2019 | |
2020 | /* prevent duplicates */ | |
2021 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2022 | return -EEXIST; | |
2023 | ||
dd8ac336 AN |
2024 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2025 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2026 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2027 | if (mddev->pers) { |
2028 | /* Cannot change size, so fail | |
2029 | * If mddev->level <= 0, then we don't care | |
2030 | * about aligning sizes (e.g. linear) | |
2031 | */ | |
2032 | if (mddev->level > 0) | |
2033 | return -ENOSPC; | |
2034 | } else | |
dd8ac336 | 2035 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2036 | } |
1da177e4 LT |
2037 | |
2038 | /* Verify rdev->desc_nr is unique. | |
2039 | * If it is -1, assign a free number, else | |
2040 | * check number is not in use | |
2041 | */ | |
2042 | if (rdev->desc_nr < 0) { | |
2043 | int choice = 0; | |
2044 | if (mddev->pers) choice = mddev->raid_disks; | |
2045 | while (find_rdev_nr(mddev, choice)) | |
2046 | choice++; | |
2047 | rdev->desc_nr = choice; | |
2048 | } else { | |
2049 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
2050 | return -EBUSY; | |
2051 | } | |
de01dfad N |
2052 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2053 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2054 | mdname(mddev), mddev->max_disks); | |
2055 | return -EBUSY; | |
2056 | } | |
19133a42 | 2057 | bdevname(rdev->bdev,b); |
649316b2 | 2058 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2059 | *s = '!'; |
649316b2 | 2060 | |
1da177e4 | 2061 | rdev->mddev = mddev; |
19133a42 | 2062 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2063 | |
b2d6db58 | 2064 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2065 | goto fail; |
86e6ffdd | 2066 | |
0762b8bd | 2067 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2068 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2069 | /* failure here is OK */; | |
2070 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2071 | |
4b80991c | 2072 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2073 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2074 | |
2075 | /* May as well allow recovery to be retried once */ | |
5389042f | 2076 | mddev->recovery_disabled++; |
3f9d99c1 | 2077 | |
1da177e4 | 2078 | return 0; |
5e55e2f5 N |
2079 | |
2080 | fail: | |
2081 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2082 | b, mdname(mddev)); | |
2083 | return err; | |
1da177e4 LT |
2084 | } |
2085 | ||
177a99b2 | 2086 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2087 | { |
3cb03002 | 2088 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2089 | kobject_del(&rdev->kobj); |
177a99b2 | 2090 | kobject_put(&rdev->kobj); |
5792a285 N |
2091 | } |
2092 | ||
3cb03002 | 2093 | static void unbind_rdev_from_array(struct md_rdev * rdev) |
1da177e4 LT |
2094 | { |
2095 | char b[BDEVNAME_SIZE]; | |
2096 | if (!rdev->mddev) { | |
2097 | MD_BUG(); | |
2098 | return; | |
2099 | } | |
49731baa | 2100 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2101 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2102 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2103 | rdev->mddev = NULL; | |
86e6ffdd | 2104 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2105 | sysfs_put(rdev->sysfs_state); |
2106 | rdev->sysfs_state = NULL; | |
2230dfe4 N |
2107 | kfree(rdev->badblocks.page); |
2108 | rdev->badblocks.count = 0; | |
2109 | rdev->badblocks.page = NULL; | |
5792a285 | 2110 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2111 | * writing to 'remove' to "dev/state". We also need |
2112 | * to delay it due to rcu usage. | |
5792a285 | 2113 | */ |
4b80991c | 2114 | synchronize_rcu(); |
177a99b2 N |
2115 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2116 | kobject_get(&rdev->kobj); | |
e804ac78 | 2117 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2118 | } |
2119 | ||
2120 | /* | |
2121 | * prevent the device from being mounted, repartitioned or | |
2122 | * otherwise reused by a RAID array (or any other kernel | |
2123 | * subsystem), by bd_claiming the device. | |
2124 | */ | |
3cb03002 | 2125 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2126 | { |
2127 | int err = 0; | |
2128 | struct block_device *bdev; | |
2129 | char b[BDEVNAME_SIZE]; | |
2130 | ||
d4d77629 | 2131 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2132 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2133 | if (IS_ERR(bdev)) { |
2134 | printk(KERN_ERR "md: could not open %s.\n", | |
2135 | __bdevname(dev, b)); | |
2136 | return PTR_ERR(bdev); | |
2137 | } | |
1da177e4 LT |
2138 | rdev->bdev = bdev; |
2139 | return err; | |
2140 | } | |
2141 | ||
3cb03002 | 2142 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2143 | { |
2144 | struct block_device *bdev = rdev->bdev; | |
2145 | rdev->bdev = NULL; | |
2146 | if (!bdev) | |
2147 | MD_BUG(); | |
e525fd89 | 2148 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2149 | } |
2150 | ||
2151 | void md_autodetect_dev(dev_t dev); | |
2152 | ||
3cb03002 | 2153 | static void export_rdev(struct md_rdev * rdev) |
1da177e4 LT |
2154 | { |
2155 | char b[BDEVNAME_SIZE]; | |
2156 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
2157 | bdevname(rdev->bdev,b)); | |
2158 | if (rdev->mddev) | |
2159 | MD_BUG(); | |
2160 | free_disk_sb(rdev); | |
1da177e4 | 2161 | #ifndef MODULE |
d0fae18f N |
2162 | if (test_bit(AutoDetected, &rdev->flags)) |
2163 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2164 | #endif |
2165 | unlock_rdev(rdev); | |
86e6ffdd | 2166 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2167 | } |
2168 | ||
3cb03002 | 2169 | static void kick_rdev_from_array(struct md_rdev * rdev) |
1da177e4 LT |
2170 | { |
2171 | unbind_rdev_from_array(rdev); | |
2172 | export_rdev(rdev); | |
2173 | } | |
2174 | ||
fd01b88c | 2175 | static void export_array(struct mddev *mddev) |
1da177e4 | 2176 | { |
3cb03002 | 2177 | struct md_rdev *rdev, *tmp; |
1da177e4 | 2178 | |
d089c6af | 2179 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2180 | if (!rdev->mddev) { |
2181 | MD_BUG(); | |
2182 | continue; | |
2183 | } | |
2184 | kick_rdev_from_array(rdev); | |
2185 | } | |
2186 | if (!list_empty(&mddev->disks)) | |
2187 | MD_BUG(); | |
2188 | mddev->raid_disks = 0; | |
2189 | mddev->major_version = 0; | |
2190 | } | |
2191 | ||
2192 | static void print_desc(mdp_disk_t *desc) | |
2193 | { | |
2194 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2195 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2196 | } | |
2197 | ||
cd2ac932 | 2198 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2199 | { |
2200 | int i; | |
2201 | ||
2202 | printk(KERN_INFO | |
2203 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2204 | sb->major_version, sb->minor_version, sb->patch_version, | |
2205 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2206 | sb->ctime); | |
2207 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2208 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2209 | sb->md_minor, sb->layout, sb->chunk_size); | |
2210 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2211 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2212 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2213 | sb->failed_disks, sb->spare_disks, | |
2214 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2215 | ||
2216 | printk(KERN_INFO); | |
2217 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2218 | mdp_disk_t *desc; | |
2219 | ||
2220 | desc = sb->disks + i; | |
2221 | if (desc->number || desc->major || desc->minor || | |
2222 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2223 | printk(" D %2d: ", i); | |
2224 | print_desc(desc); | |
2225 | } | |
2226 | } | |
2227 | printk(KERN_INFO "md: THIS: "); | |
2228 | print_desc(&sb->this_disk); | |
cd2ac932 | 2229 | } |
1da177e4 | 2230 | |
cd2ac932 CR |
2231 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2232 | { | |
2233 | __u8 *uuid; | |
2234 | ||
2235 | uuid = sb->set_uuid; | |
ad361c98 | 2236 | printk(KERN_INFO |
7b75c2f8 | 2237 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2238 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2239 | le32_to_cpu(sb->major_version), |
2240 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2241 | uuid, |
cd2ac932 CR |
2242 | sb->set_name, |
2243 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2244 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2245 | ||
2246 | uuid = sb->device_uuid; | |
ad361c98 JP |
2247 | printk(KERN_INFO |
2248 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2249 | " RO:%llu\n" |
7b75c2f8 | 2250 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2251 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2252 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2253 | le32_to_cpu(sb->level), |
2254 | (unsigned long long)le64_to_cpu(sb->size), | |
2255 | le32_to_cpu(sb->raid_disks), | |
2256 | le32_to_cpu(sb->layout), | |
2257 | le32_to_cpu(sb->chunksize), | |
2258 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2259 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2260 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2261 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2262 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2263 | uuid, |
cd2ac932 CR |
2264 | sb->devflags, |
2265 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2266 | (unsigned long long)le64_to_cpu(sb->events), | |
2267 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2268 | le32_to_cpu(sb->sb_csum), | |
2269 | le32_to_cpu(sb->max_dev) | |
2270 | ); | |
1da177e4 LT |
2271 | } |
2272 | ||
3cb03002 | 2273 | static void print_rdev(struct md_rdev *rdev, int major_version) |
1da177e4 LT |
2274 | { |
2275 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2276 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2277 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2278 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2279 | rdev->desc_nr); | |
1da177e4 | 2280 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2281 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2282 | switch (major_version) { | |
2283 | case 0: | |
65a06f06 | 2284 | print_sb_90(page_address(rdev->sb_page)); |
cd2ac932 CR |
2285 | break; |
2286 | case 1: | |
65a06f06 | 2287 | print_sb_1(page_address(rdev->sb_page)); |
cd2ac932 CR |
2288 | break; |
2289 | } | |
1da177e4 LT |
2290 | } else |
2291 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2292 | } | |
2293 | ||
5e56341d | 2294 | static void md_print_devices(void) |
1da177e4 | 2295 | { |
159ec1fc | 2296 | struct list_head *tmp; |
3cb03002 | 2297 | struct md_rdev *rdev; |
fd01b88c | 2298 | struct mddev *mddev; |
1da177e4 LT |
2299 | char b[BDEVNAME_SIZE]; |
2300 | ||
2301 | printk("\n"); | |
2302 | printk("md: **********************************\n"); | |
2303 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2304 | printk("md: **********************************\n"); | |
29ac4aa3 | 2305 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2306 | |
32a7627c N |
2307 | if (mddev->bitmap) |
2308 | bitmap_print_sb(mddev->bitmap); | |
2309 | else | |
2310 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2311 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2312 | printk("<%s>", bdevname(rdev->bdev,b)); |
2313 | printk("\n"); | |
2314 | ||
159ec1fc | 2315 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2316 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2317 | } |
2318 | printk("md: **********************************\n"); | |
2319 | printk("\n"); | |
2320 | } | |
2321 | ||
2322 | ||
fd01b88c | 2323 | static void sync_sbs(struct mddev * mddev, int nospares) |
1da177e4 | 2324 | { |
42543769 N |
2325 | /* Update each superblock (in-memory image), but |
2326 | * if we are allowed to, skip spares which already | |
2327 | * have the right event counter, or have one earlier | |
2328 | * (which would mean they aren't being marked as dirty | |
2329 | * with the rest of the array) | |
2330 | */ | |
3cb03002 | 2331 | struct md_rdev *rdev; |
159ec1fc | 2332 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2333 | if (rdev->sb_events == mddev->events || |
2334 | (nospares && | |
2335 | rdev->raid_disk < 0 && | |
42543769 N |
2336 | rdev->sb_events+1 == mddev->events)) { |
2337 | /* Don't update this superblock */ | |
2338 | rdev->sb_loaded = 2; | |
2339 | } else { | |
076f968b | 2340 | sync_super(mddev, rdev); |
42543769 N |
2341 | rdev->sb_loaded = 1; |
2342 | } | |
1da177e4 LT |
2343 | } |
2344 | } | |
2345 | ||
fd01b88c | 2346 | static void md_update_sb(struct mddev * mddev, int force_change) |
1da177e4 | 2347 | { |
3cb03002 | 2348 | struct md_rdev *rdev; |
06d91a5f | 2349 | int sync_req; |
42543769 | 2350 | int nospares = 0; |
2699b672 | 2351 | int any_badblocks_changed = 0; |
1da177e4 | 2352 | |
1da177e4 | 2353 | repeat: |
3a3a5ddb N |
2354 | /* First make sure individual recovery_offsets are correct */ |
2355 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2356 | if (rdev->raid_disk >= 0 && | |
2357 | mddev->delta_disks >= 0 && | |
2358 | !test_bit(In_sync, &rdev->flags) && | |
2359 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2360 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2361 | ||
2362 | } | |
bd52b746 | 2363 | if (!mddev->persistent) { |
070dc6dd | 2364 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2365 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2366 | if (!mddev->external) { |
d97a41dc | 2367 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
de393cde N |
2368 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
2369 | if (rdev->badblocks.changed) { | |
2370 | md_ack_all_badblocks(&rdev->badblocks); | |
2371 | md_error(mddev, rdev); | |
2372 | } | |
2373 | clear_bit(Blocked, &rdev->flags); | |
2374 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2375 | wake_up(&rdev->blocked_wait); | |
2376 | } | |
2377 | } | |
3a3a5ddb N |
2378 | wake_up(&mddev->sb_wait); |
2379 | return; | |
2380 | } | |
2381 | ||
a9701a30 | 2382 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2383 | |
3a3a5ddb N |
2384 | mddev->utime = get_seconds(); |
2385 | ||
850b2b42 N |
2386 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2387 | force_change = 1; | |
2388 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2389 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2390 | * though if events isn't the right even/odd, we will have to do | |
2391 | * spares after all | |
2392 | */ | |
2393 | nospares = 1; | |
2394 | if (force_change) | |
2395 | nospares = 0; | |
2396 | if (mddev->degraded) | |
84692195 N |
2397 | /* If the array is degraded, then skipping spares is both |
2398 | * dangerous and fairly pointless. | |
2399 | * Dangerous because a device that was removed from the array | |
2400 | * might have a event_count that still looks up-to-date, | |
2401 | * so it can be re-added without a resync. | |
2402 | * Pointless because if there are any spares to skip, | |
2403 | * then a recovery will happen and soon that array won't | |
2404 | * be degraded any more and the spare can go back to sleep then. | |
2405 | */ | |
850b2b42 | 2406 | nospares = 0; |
84692195 | 2407 | |
06d91a5f | 2408 | sync_req = mddev->in_sync; |
42543769 N |
2409 | |
2410 | /* If this is just a dirty<->clean transition, and the array is clean | |
2411 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2412 | if (nospares |
42543769 | 2413 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2414 | && mddev->can_decrease_events |
2415 | && mddev->events != 1) { | |
42543769 | 2416 | mddev->events--; |
a8707c08 N |
2417 | mddev->can_decrease_events = 0; |
2418 | } else { | |
42543769 N |
2419 | /* otherwise we have to go forward and ... */ |
2420 | mddev->events ++; | |
a8707c08 | 2421 | mddev->can_decrease_events = nospares; |
42543769 | 2422 | } |
1da177e4 LT |
2423 | |
2424 | if (!mddev->events) { | |
2425 | /* | |
2426 | * oops, this 64-bit counter should never wrap. | |
2427 | * Either we are in around ~1 trillion A.C., assuming | |
2428 | * 1 reboot per second, or we have a bug: | |
2429 | */ | |
2430 | MD_BUG(); | |
2431 | mddev->events --; | |
2432 | } | |
2699b672 | 2433 | |
de393cde | 2434 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
2699b672 N |
2435 | if (rdev->badblocks.changed) |
2436 | any_badblocks_changed++; | |
de393cde N |
2437 | if (test_bit(Faulty, &rdev->flags)) |
2438 | set_bit(FaultRecorded, &rdev->flags); | |
2439 | } | |
2699b672 | 2440 | |
e691063a | 2441 | sync_sbs(mddev, nospares); |
a9701a30 | 2442 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 | 2443 | |
36a4e1fe N |
2444 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2445 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2446 | |
4ad13663 | 2447 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2448 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 2449 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2450 | |
42543769 N |
2451 | if (rdev->sb_loaded != 1) |
2452 | continue; /* no noise on spare devices */ | |
1da177e4 | 2453 | |
d70ed2e4 AW |
2454 | if (!test_bit(Faulty, &rdev->flags) && |
2455 | rdev->saved_raid_disk == -1) { | |
7bfa19f2 | 2456 | md_super_write(mddev,rdev, |
0f420358 | 2457 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2458 | rdev->sb_page); |
36a4e1fe N |
2459 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2460 | bdevname(rdev->bdev, b), | |
2461 | (unsigned long long)rdev->sb_start); | |
42543769 | 2462 | rdev->sb_events = mddev->events; |
2699b672 N |
2463 | if (rdev->badblocks.size) { |
2464 | md_super_write(mddev, rdev, | |
2465 | rdev->badblocks.sector, | |
2466 | rdev->badblocks.size << 9, | |
2467 | rdev->bb_page); | |
2468 | rdev->badblocks.size = 0; | |
2469 | } | |
7bfa19f2 | 2470 | |
d70ed2e4 | 2471 | } else if (test_bit(Faulty, &rdev->flags)) |
36a4e1fe N |
2472 | pr_debug("md: %s (skipping faulty)\n", |
2473 | bdevname(rdev->bdev, b)); | |
d70ed2e4 AW |
2474 | else |
2475 | pr_debug("(skipping incremental s/r "); | |
2476 | ||
7bfa19f2 | 2477 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2478 | /* only need to write one superblock... */ |
2479 | break; | |
2480 | } | |
a9701a30 | 2481 | md_super_wait(mddev); |
850b2b42 | 2482 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2483 | |
a9701a30 | 2484 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2485 | if (mddev->in_sync != sync_req || |
2486 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2487 | /* have to write it out again */ |
a9701a30 | 2488 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2489 | goto repeat; |
2490 | } | |
850b2b42 | 2491 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2492 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2493 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2494 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2495 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2496 | |
de393cde N |
2497 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
2498 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) | |
2499 | clear_bit(Blocked, &rdev->flags); | |
2500 | ||
2501 | if (any_badblocks_changed) | |
2699b672 | 2502 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2503 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2504 | wake_up(&rdev->blocked_wait); | |
2505 | } | |
1da177e4 LT |
2506 | } |
2507 | ||
7f6ce769 | 2508 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2509 | * We want to accept with case. For this we use cmd_match. |
2510 | */ | |
2511 | static int cmd_match(const char *cmd, const char *str) | |
2512 | { | |
2513 | /* See if cmd, written into a sysfs file, matches | |
2514 | * str. They must either be the same, or cmd can | |
2515 | * have a trailing newline | |
2516 | */ | |
2517 | while (*cmd && *str && *cmd == *str) { | |
2518 | cmd++; | |
2519 | str++; | |
2520 | } | |
2521 | if (*cmd == '\n') | |
2522 | cmd++; | |
2523 | if (*str || *cmd) | |
2524 | return 0; | |
2525 | return 1; | |
2526 | } | |
2527 | ||
86e6ffdd N |
2528 | struct rdev_sysfs_entry { |
2529 | struct attribute attr; | |
3cb03002 N |
2530 | ssize_t (*show)(struct md_rdev *, char *); |
2531 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2532 | }; |
2533 | ||
2534 | static ssize_t | |
3cb03002 | 2535 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2536 | { |
2537 | char *sep = ""; | |
20a49ff6 | 2538 | size_t len = 0; |
86e6ffdd | 2539 | |
de393cde N |
2540 | if (test_bit(Faulty, &rdev->flags) || |
2541 | rdev->badblocks.unacked_exist) { | |
86e6ffdd N |
2542 | len+= sprintf(page+len, "%sfaulty",sep); |
2543 | sep = ","; | |
2544 | } | |
b2d444d7 | 2545 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2546 | len += sprintf(page+len, "%sin_sync",sep); |
2547 | sep = ","; | |
2548 | } | |
f655675b N |
2549 | if (test_bit(WriteMostly, &rdev->flags)) { |
2550 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2551 | sep = ","; | |
2552 | } | |
de393cde | 2553 | if (test_bit(Blocked, &rdev->flags) || |
52c64152 N |
2554 | (rdev->badblocks.unacked_exist |
2555 | && !test_bit(Faulty, &rdev->flags))) { | |
6bfe0b49 DW |
2556 | len += sprintf(page+len, "%sblocked", sep); |
2557 | sep = ","; | |
2558 | } | |
b2d444d7 N |
2559 | if (!test_bit(Faulty, &rdev->flags) && |
2560 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2561 | len += sprintf(page+len, "%sspare", sep); |
2562 | sep = ","; | |
2563 | } | |
d7a9d443 N |
2564 | if (test_bit(WriteErrorSeen, &rdev->flags)) { |
2565 | len += sprintf(page+len, "%swrite_error", sep); | |
2566 | sep = ","; | |
2567 | } | |
2d78f8c4 N |
2568 | if (test_bit(WantReplacement, &rdev->flags)) { |
2569 | len += sprintf(page+len, "%swant_replacement", sep); | |
2570 | sep = ","; | |
2571 | } | |
2572 | if (test_bit(Replacement, &rdev->flags)) { | |
2573 | len += sprintf(page+len, "%sreplacement", sep); | |
2574 | sep = ","; | |
2575 | } | |
2576 | ||
86e6ffdd N |
2577 | return len+sprintf(page+len, "\n"); |
2578 | } | |
2579 | ||
45dc2de1 | 2580 | static ssize_t |
3cb03002 | 2581 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2582 | { |
2583 | /* can write | |
de393cde | 2584 | * faulty - simulates an error |
45dc2de1 | 2585 | * remove - disconnects the device |
f655675b N |
2586 | * writemostly - sets write_mostly |
2587 | * -writemostly - clears write_mostly | |
de393cde N |
2588 | * blocked - sets the Blocked flags |
2589 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2590 | * insync - sets Insync providing device isn't active |
d7a9d443 N |
2591 | * write_error - sets WriteErrorSeen |
2592 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2593 | */ |
2594 | int err = -EINVAL; | |
2595 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2596 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2597 | if (test_bit(Faulty, &rdev->flags)) |
2598 | err = 0; | |
2599 | else | |
2600 | err = -EBUSY; | |
45dc2de1 N |
2601 | } else if (cmd_match(buf, "remove")) { |
2602 | if (rdev->raid_disk >= 0) | |
2603 | err = -EBUSY; | |
2604 | else { | |
fd01b88c | 2605 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2606 | kick_rdev_from_array(rdev); |
3f9d7b0d N |
2607 | if (mddev->pers) |
2608 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2609 | md_new_event(mddev); |
2610 | err = 0; | |
2611 | } | |
f655675b N |
2612 | } else if (cmd_match(buf, "writemostly")) { |
2613 | set_bit(WriteMostly, &rdev->flags); | |
2614 | err = 0; | |
2615 | } else if (cmd_match(buf, "-writemostly")) { | |
2616 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2617 | err = 0; |
2618 | } else if (cmd_match(buf, "blocked")) { | |
2619 | set_bit(Blocked, &rdev->flags); | |
2620 | err = 0; | |
2621 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2622 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2623 | rdev->badblocks.unacked_exist) { |
de393cde N |
2624 | /* metadata handler doesn't understand badblocks, |
2625 | * so we need to fail the device | |
2626 | */ | |
2627 | md_error(rdev->mddev, rdev); | |
2628 | } | |
6bfe0b49 | 2629 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2630 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2631 | wake_up(&rdev->blocked_wait); |
2632 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2633 | md_wakeup_thread(rdev->mddev->thread); | |
2634 | ||
6d56e278 N |
2635 | err = 0; |
2636 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2637 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2638 | err = 0; |
d7a9d443 N |
2639 | } else if (cmd_match(buf, "write_error")) { |
2640 | set_bit(WriteErrorSeen, &rdev->flags); | |
2641 | err = 0; | |
2642 | } else if (cmd_match(buf, "-write_error")) { | |
2643 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2644 | err = 0; | |
2d78f8c4 N |
2645 | } else if (cmd_match(buf, "want_replacement")) { |
2646 | /* Any non-spare device that is not a replacement can | |
2647 | * become want_replacement at any time, but we then need to | |
2648 | * check if recovery is needed. | |
2649 | */ | |
2650 | if (rdev->raid_disk >= 0 && | |
2651 | !test_bit(Replacement, &rdev->flags)) | |
2652 | set_bit(WantReplacement, &rdev->flags); | |
2653 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2654 | md_wakeup_thread(rdev->mddev->thread); | |
2655 | err = 0; | |
2656 | } else if (cmd_match(buf, "-want_replacement")) { | |
2657 | /* Clearing 'want_replacement' is always allowed. | |
2658 | * Once replacements starts it is too late though. | |
2659 | */ | |
2660 | err = 0; | |
2661 | clear_bit(WantReplacement, &rdev->flags); | |
2662 | } else if (cmd_match(buf, "replacement")) { | |
2663 | /* Can only set a device as a replacement when array has not | |
2664 | * yet been started. Once running, replacement is automatic | |
2665 | * from spares, or by assigning 'slot'. | |
2666 | */ | |
2667 | if (rdev->mddev->pers) | |
2668 | err = -EBUSY; | |
2669 | else { | |
2670 | set_bit(Replacement, &rdev->flags); | |
2671 | err = 0; | |
2672 | } | |
2673 | } else if (cmd_match(buf, "-replacement")) { | |
2674 | /* Similarly, can only clear Replacement before start */ | |
2675 | if (rdev->mddev->pers) | |
2676 | err = -EBUSY; | |
2677 | else { | |
2678 | clear_bit(Replacement, &rdev->flags); | |
2679 | err = 0; | |
2680 | } | |
45dc2de1 | 2681 | } |
00bcb4ac N |
2682 | if (!err) |
2683 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2684 | return err ? err : len; |
2685 | } | |
80ca3a44 N |
2686 | static struct rdev_sysfs_entry rdev_state = |
2687 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2688 | |
4dbcdc75 | 2689 | static ssize_t |
3cb03002 | 2690 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2691 | { |
2692 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2693 | } | |
2694 | ||
2695 | static ssize_t | |
3cb03002 | 2696 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 N |
2697 | { |
2698 | char *e; | |
2699 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2700 | if (*buf && (*e == 0 || *e == '\n')) { | |
2701 | atomic_set(&rdev->corrected_errors, n); | |
2702 | return len; | |
2703 | } | |
2704 | return -EINVAL; | |
2705 | } | |
2706 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2707 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2708 | |
014236d2 | 2709 | static ssize_t |
3cb03002 | 2710 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2711 | { |
2712 | if (rdev->raid_disk < 0) | |
2713 | return sprintf(page, "none\n"); | |
2714 | else | |
2715 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2716 | } | |
2717 | ||
2718 | static ssize_t | |
3cb03002 | 2719 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 N |
2720 | { |
2721 | char *e; | |
c303da6d | 2722 | int err; |
014236d2 N |
2723 | int slot = simple_strtoul(buf, &e, 10); |
2724 | if (strncmp(buf, "none", 4)==0) | |
2725 | slot = -1; | |
2726 | else if (e==buf || (*e && *e!= '\n')) | |
2727 | return -EINVAL; | |
6c2fce2e | 2728 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2729 | /* Setting 'slot' on an active array requires also |
2730 | * updating the 'rd%d' link, and communicating | |
2731 | * with the personality with ->hot_*_disk. | |
2732 | * For now we only support removing | |
2733 | * failed/spare devices. This normally happens automatically, | |
2734 | * but not when the metadata is externally managed. | |
2735 | */ | |
c303da6d N |
2736 | if (rdev->raid_disk == -1) |
2737 | return -EEXIST; | |
2738 | /* personality does all needed checks */ | |
01393f3d | 2739 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d N |
2740 | return -EINVAL; |
2741 | err = rdev->mddev->pers-> | |
b8321b68 | 2742 | hot_remove_disk(rdev->mddev, rdev); |
c303da6d N |
2743 | if (err) |
2744 | return err; | |
36fad858 | 2745 | sysfs_unlink_rdev(rdev->mddev, rdev); |
b7103107 | 2746 | rdev->raid_disk = -1; |
c303da6d N |
2747 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2748 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2749 | } else if (rdev->mddev->pers) { |
6c2fce2e | 2750 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2751 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2752 | */ |
2753 | ||
2754 | if (rdev->raid_disk != -1) | |
2755 | return -EBUSY; | |
2756 | ||
c6751b2b N |
2757 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2758 | return -EBUSY; | |
2759 | ||
6c2fce2e NB |
2760 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2761 | return -EINVAL; | |
2762 | ||
ba1b41b6 N |
2763 | if (slot >= rdev->mddev->raid_disks && |
2764 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2765 | return -ENOSPC; | |
2766 | ||
6c2fce2e NB |
2767 | rdev->raid_disk = slot; |
2768 | if (test_bit(In_sync, &rdev->flags)) | |
2769 | rdev->saved_raid_disk = slot; | |
2770 | else | |
2771 | rdev->saved_raid_disk = -1; | |
d30519fc | 2772 | clear_bit(In_sync, &rdev->flags); |
6c2fce2e NB |
2773 | err = rdev->mddev->pers-> |
2774 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2775 | if (err) { |
6c2fce2e | 2776 | rdev->raid_disk = -1; |
6c2fce2e | 2777 | return err; |
52664732 | 2778 | } else |
00bcb4ac | 2779 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2780 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2781 | /* failure here is OK */; |
6c2fce2e | 2782 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2783 | } else { |
ba1b41b6 N |
2784 | if (slot >= rdev->mddev->raid_disks && |
2785 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2786 | return -ENOSPC; |
2787 | rdev->raid_disk = slot; | |
2788 | /* assume it is working */ | |
c5d79adb N |
2789 | clear_bit(Faulty, &rdev->flags); |
2790 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2791 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2792 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2793 | } |
014236d2 N |
2794 | return len; |
2795 | } | |
2796 | ||
2797 | ||
2798 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2799 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2800 | |
93c8cad0 | 2801 | static ssize_t |
3cb03002 | 2802 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2803 | { |
6961ece4 | 2804 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2805 | } |
2806 | ||
2807 | static ssize_t | |
3cb03002 | 2808 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 N |
2809 | { |
2810 | char *e; | |
2811 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2812 | if (e==buf || (*e && *e != '\n')) | |
2813 | return -EINVAL; | |
8ed0a521 | 2814 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2815 | return -EBUSY; |
dd8ac336 | 2816 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2817 | /* Must set offset before size, so overlap checks |
2818 | * can be sane */ | |
2819 | return -EBUSY; | |
93c8cad0 N |
2820 | rdev->data_offset = offset; |
2821 | return len; | |
2822 | } | |
2823 | ||
2824 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2825 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2826 | |
83303b61 | 2827 | static ssize_t |
3cb03002 | 2828 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2829 | { |
dd8ac336 | 2830 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2831 | } |
2832 | ||
c5d79adb N |
2833 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2834 | { | |
2835 | /* check if two start/length pairs overlap */ | |
2836 | if (s1+l1 <= s2) | |
2837 | return 0; | |
2838 | if (s2+l2 <= s1) | |
2839 | return 0; | |
2840 | return 1; | |
2841 | } | |
2842 | ||
b522adcd DW |
2843 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2844 | { | |
2845 | unsigned long long blocks; | |
2846 | sector_t new; | |
2847 | ||
2848 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2849 | return -EINVAL; | |
2850 | ||
2851 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2852 | return -EINVAL; /* sector conversion overflow */ | |
2853 | ||
2854 | new = blocks * 2; | |
2855 | if (new != blocks * 2) | |
2856 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2857 | ||
2858 | *sectors = new; | |
2859 | return 0; | |
2860 | } | |
2861 | ||
83303b61 | 2862 | static ssize_t |
3cb03002 | 2863 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2864 | { |
fd01b88c | 2865 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2866 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2867 | sector_t sectors; |
27c529bb | 2868 | |
b522adcd | 2869 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2870 | return -EINVAL; |
0cd17fec | 2871 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2872 | if (my_mddev->persistent) { |
dd8ac336 AN |
2873 | sectors = super_types[my_mddev->major_version]. |
2874 | rdev_size_change(rdev, sectors); | |
2875 | if (!sectors) | |
0cd17fec | 2876 | return -EBUSY; |
dd8ac336 | 2877 | } else if (!sectors) |
77304d2a | 2878 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2879 | rdev->data_offset; |
0cd17fec | 2880 | } |
dd8ac336 | 2881 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2882 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2883 | |
dd8ac336 AN |
2884 | rdev->sectors = sectors; |
2885 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2886 | /* need to check that all other rdevs with the same ->bdev |
2887 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2888 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2889 | * we have to change it back, we will have the lock again. |
2890 | */ | |
fd01b88c | 2891 | struct mddev *mddev; |
c5d79adb | 2892 | int overlap = 0; |
159ec1fc | 2893 | struct list_head *tmp; |
c5d79adb | 2894 | |
27c529bb | 2895 | mddev_unlock(my_mddev); |
29ac4aa3 | 2896 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2897 | struct md_rdev *rdev2; |
c5d79adb N |
2898 | |
2899 | mddev_lock(mddev); | |
159ec1fc | 2900 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
f21e9ff7 N |
2901 | if (rdev->bdev == rdev2->bdev && |
2902 | rdev != rdev2 && | |
2903 | overlaps(rdev->data_offset, rdev->sectors, | |
2904 | rdev2->data_offset, | |
2905 | rdev2->sectors)) { | |
c5d79adb N |
2906 | overlap = 1; |
2907 | break; | |
2908 | } | |
2909 | mddev_unlock(mddev); | |
2910 | if (overlap) { | |
2911 | mddev_put(mddev); | |
2912 | break; | |
2913 | } | |
2914 | } | |
27c529bb | 2915 | mddev_lock(my_mddev); |
c5d79adb N |
2916 | if (overlap) { |
2917 | /* Someone else could have slipped in a size | |
2918 | * change here, but doing so is just silly. | |
dd8ac336 | 2919 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2920 | * safe, and trust userspace not to race with |
2921 | * itself | |
2922 | */ | |
dd8ac336 | 2923 | rdev->sectors = oldsectors; |
c5d79adb N |
2924 | return -EBUSY; |
2925 | } | |
2926 | } | |
83303b61 N |
2927 | return len; |
2928 | } | |
2929 | ||
2930 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2931 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2932 | |
06e3c817 | 2933 | |
3cb03002 | 2934 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
2935 | { |
2936 | unsigned long long recovery_start = rdev->recovery_offset; | |
2937 | ||
2938 | if (test_bit(In_sync, &rdev->flags) || | |
2939 | recovery_start == MaxSector) | |
2940 | return sprintf(page, "none\n"); | |
2941 | ||
2942 | return sprintf(page, "%llu\n", recovery_start); | |
2943 | } | |
2944 | ||
3cb03002 | 2945 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
2946 | { |
2947 | unsigned long long recovery_start; | |
2948 | ||
2949 | if (cmd_match(buf, "none")) | |
2950 | recovery_start = MaxSector; | |
2951 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2952 | return -EINVAL; | |
2953 | ||
2954 | if (rdev->mddev->pers && | |
2955 | rdev->raid_disk >= 0) | |
2956 | return -EBUSY; | |
2957 | ||
2958 | rdev->recovery_offset = recovery_start; | |
2959 | if (recovery_start == MaxSector) | |
2960 | set_bit(In_sync, &rdev->flags); | |
2961 | else | |
2962 | clear_bit(In_sync, &rdev->flags); | |
2963 | return len; | |
2964 | } | |
2965 | ||
2966 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2967 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2968 | ||
16c791a5 N |
2969 | |
2970 | static ssize_t | |
2971 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2972 | static ssize_t | |
2973 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2974 | ||
3cb03002 | 2975 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2976 | { |
2977 | return badblocks_show(&rdev->badblocks, page, 0); | |
2978 | } | |
3cb03002 | 2979 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 2980 | { |
de393cde N |
2981 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
2982 | /* Maybe that ack was all we needed */ | |
2983 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
2984 | wake_up(&rdev->blocked_wait); | |
2985 | return rv; | |
16c791a5 N |
2986 | } |
2987 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2988 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2989 | ||
2990 | ||
3cb03002 | 2991 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2992 | { |
2993 | return badblocks_show(&rdev->badblocks, page, 1); | |
2994 | } | |
3cb03002 | 2995 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
2996 | { |
2997 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2998 | } | |
2999 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
3000 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
3001 | ||
86e6ffdd N |
3002 | static struct attribute *rdev_default_attrs[] = { |
3003 | &rdev_state.attr, | |
4dbcdc75 | 3004 | &rdev_errors.attr, |
014236d2 | 3005 | &rdev_slot.attr, |
93c8cad0 | 3006 | &rdev_offset.attr, |
83303b61 | 3007 | &rdev_size.attr, |
06e3c817 | 3008 | &rdev_recovery_start.attr, |
16c791a5 N |
3009 | &rdev_bad_blocks.attr, |
3010 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
3011 | NULL, |
3012 | }; | |
3013 | static ssize_t | |
3014 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3015 | { | |
3016 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3017 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
fd01b88c | 3018 | struct mddev *mddev = rdev->mddev; |
27c529bb | 3019 | ssize_t rv; |
86e6ffdd N |
3020 | |
3021 | if (!entry->show) | |
3022 | return -EIO; | |
27c529bb N |
3023 | |
3024 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
3025 | if (!rv) { | |
3026 | if (rdev->mddev == NULL) | |
3027 | rv = -EBUSY; | |
3028 | else | |
3029 | rv = entry->show(rdev, page); | |
3030 | mddev_unlock(mddev); | |
3031 | } | |
3032 | return rv; | |
86e6ffdd N |
3033 | } |
3034 | ||
3035 | static ssize_t | |
3036 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
3037 | const char *page, size_t length) | |
3038 | { | |
3039 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 3040 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 3041 | ssize_t rv; |
fd01b88c | 3042 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
3043 | |
3044 | if (!entry->store) | |
3045 | return -EIO; | |
67463acb N |
3046 | if (!capable(CAP_SYS_ADMIN)) |
3047 | return -EACCES; | |
27c529bb | 3048 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 3049 | if (!rv) { |
27c529bb N |
3050 | if (rdev->mddev == NULL) |
3051 | rv = -EBUSY; | |
3052 | else | |
3053 | rv = entry->store(rdev, page, length); | |
6a51830e | 3054 | mddev_unlock(mddev); |
ca388059 N |
3055 | } |
3056 | return rv; | |
86e6ffdd N |
3057 | } |
3058 | ||
3059 | static void rdev_free(struct kobject *ko) | |
3060 | { | |
3cb03002 | 3061 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3062 | kfree(rdev); |
3063 | } | |
52cf25d0 | 3064 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3065 | .show = rdev_attr_show, |
3066 | .store = rdev_attr_store, | |
3067 | }; | |
3068 | static struct kobj_type rdev_ktype = { | |
3069 | .release = rdev_free, | |
3070 | .sysfs_ops = &rdev_sysfs_ops, | |
3071 | .default_attrs = rdev_default_attrs, | |
3072 | }; | |
3073 | ||
3cb03002 | 3074 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3075 | { |
3076 | rdev->desc_nr = -1; | |
3077 | rdev->saved_raid_disk = -1; | |
3078 | rdev->raid_disk = -1; | |
3079 | rdev->flags = 0; | |
3080 | rdev->data_offset = 0; | |
3081 | rdev->sb_events = 0; | |
3082 | rdev->last_read_error.tv_sec = 0; | |
3083 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3084 | rdev->sb_loaded = 0; |
3085 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3086 | atomic_set(&rdev->nr_pending, 0); |
3087 | atomic_set(&rdev->read_errors, 0); | |
3088 | atomic_set(&rdev->corrected_errors, 0); | |
3089 | ||
3090 | INIT_LIST_HEAD(&rdev->same_set); | |
3091 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3092 | |
3093 | /* Add space to store bad block list. | |
3094 | * This reserves the space even on arrays where it cannot | |
3095 | * be used - I wonder if that matters | |
3096 | */ | |
3097 | rdev->badblocks.count = 0; | |
3098 | rdev->badblocks.shift = 0; | |
3099 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3100 | seqlock_init(&rdev->badblocks.lock); | |
3101 | if (rdev->badblocks.page == NULL) | |
3102 | return -ENOMEM; | |
3103 | ||
3104 | return 0; | |
e8bb9a83 N |
3105 | } |
3106 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3107 | /* |
3108 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3109 | * | |
3110 | * mark the device faulty if: | |
3111 | * | |
3112 | * - the device is nonexistent (zero size) | |
3113 | * - the device has no valid superblock | |
3114 | * | |
3115 | * a faulty rdev _never_ has rdev->sb set. | |
3116 | */ | |
3cb03002 | 3117 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3118 | { |
3119 | char b[BDEVNAME_SIZE]; | |
3120 | int err; | |
3cb03002 | 3121 | struct md_rdev *rdev; |
1da177e4 LT |
3122 | sector_t size; |
3123 | ||
9ffae0cf | 3124 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3125 | if (!rdev) { |
3126 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3127 | return ERR_PTR(-ENOMEM); | |
3128 | } | |
1da177e4 | 3129 | |
2230dfe4 N |
3130 | err = md_rdev_init(rdev); |
3131 | if (err) | |
3132 | goto abort_free; | |
3133 | err = alloc_disk_sb(rdev); | |
3134 | if (err) | |
1da177e4 LT |
3135 | goto abort_free; |
3136 | ||
c5d79adb | 3137 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3138 | if (err) |
3139 | goto abort_free; | |
3140 | ||
f9cb074b | 3141 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3142 | |
77304d2a | 3143 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 LT |
3144 | if (!size) { |
3145 | printk(KERN_WARNING | |
3146 | "md: %s has zero or unknown size, marking faulty!\n", | |
3147 | bdevname(rdev->bdev,b)); | |
3148 | err = -EINVAL; | |
3149 | goto abort_free; | |
3150 | } | |
3151 | ||
3152 | if (super_format >= 0) { | |
3153 | err = super_types[super_format]. | |
3154 | load_super(rdev, NULL, super_minor); | |
3155 | if (err == -EINVAL) { | |
df968c4e N |
3156 | printk(KERN_WARNING |
3157 | "md: %s does not have a valid v%d.%d " | |
3158 | "superblock, not importing!\n", | |
3159 | bdevname(rdev->bdev,b), | |
3160 | super_format, super_minor); | |
1da177e4 LT |
3161 | goto abort_free; |
3162 | } | |
3163 | if (err < 0) { | |
3164 | printk(KERN_WARNING | |
3165 | "md: could not read %s's sb, not importing!\n", | |
3166 | bdevname(rdev->bdev,b)); | |
3167 | goto abort_free; | |
3168 | } | |
3169 | } | |
9f2f3830 N |
3170 | if (super_format == -1) |
3171 | /* hot-add for 0.90, or non-persistent: so no badblocks */ | |
3172 | rdev->badblocks.shift = -1; | |
6bfe0b49 | 3173 | |
1da177e4 LT |
3174 | return rdev; |
3175 | ||
3176 | abort_free: | |
2699b672 N |
3177 | if (rdev->bdev) |
3178 | unlock_rdev(rdev); | |
3179 | free_disk_sb(rdev); | |
2230dfe4 | 3180 | kfree(rdev->badblocks.page); |
1da177e4 LT |
3181 | kfree(rdev); |
3182 | return ERR_PTR(err); | |
3183 | } | |
3184 | ||
3185 | /* | |
3186 | * Check a full RAID array for plausibility | |
3187 | */ | |
3188 | ||
3189 | ||
fd01b88c | 3190 | static void analyze_sbs(struct mddev * mddev) |
1da177e4 LT |
3191 | { |
3192 | int i; | |
3cb03002 | 3193 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3194 | char b[BDEVNAME_SIZE]; |
3195 | ||
3196 | freshest = NULL; | |
d089c6af | 3197 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
3198 | switch (super_types[mddev->major_version]. |
3199 | load_super(rdev, freshest, mddev->minor_version)) { | |
3200 | case 1: | |
3201 | freshest = rdev; | |
3202 | break; | |
3203 | case 0: | |
3204 | break; | |
3205 | default: | |
3206 | printk( KERN_ERR \ | |
3207 | "md: fatal superblock inconsistency in %s" | |
3208 | " -- removing from array\n", | |
3209 | bdevname(rdev->bdev,b)); | |
3210 | kick_rdev_from_array(rdev); | |
3211 | } | |
3212 | ||
3213 | ||
3214 | super_types[mddev->major_version]. | |
3215 | validate_super(mddev, freshest); | |
3216 | ||
3217 | i = 0; | |
d089c6af | 3218 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
3219 | if (mddev->max_disks && |
3220 | (rdev->desc_nr >= mddev->max_disks || | |
3221 | i > mddev->max_disks)) { | |
de01dfad N |
3222 | printk(KERN_WARNING |
3223 | "md: %s: %s: only %d devices permitted\n", | |
3224 | mdname(mddev), bdevname(rdev->bdev, b), | |
3225 | mddev->max_disks); | |
3226 | kick_rdev_from_array(rdev); | |
3227 | continue; | |
3228 | } | |
1da177e4 LT |
3229 | if (rdev != freshest) |
3230 | if (super_types[mddev->major_version]. | |
3231 | validate_super(mddev, rdev)) { | |
3232 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3233 | " from array!\n", | |
3234 | bdevname(rdev->bdev,b)); | |
3235 | kick_rdev_from_array(rdev); | |
3236 | continue; | |
3237 | } | |
3238 | if (mddev->level == LEVEL_MULTIPATH) { | |
3239 | rdev->desc_nr = i++; | |
3240 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3241 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3242 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3243 | rdev->raid_disk = -1; |
3244 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3245 | } |
3246 | } | |
1da177e4 LT |
3247 | } |
3248 | ||
72e02075 N |
3249 | /* Read a fixed-point number. |
3250 | * Numbers in sysfs attributes should be in "standard" units where | |
3251 | * possible, so time should be in seconds. | |
3252 | * However we internally use a a much smaller unit such as | |
3253 | * milliseconds or jiffies. | |
3254 | * This function takes a decimal number with a possible fractional | |
3255 | * component, and produces an integer which is the result of | |
3256 | * multiplying that number by 10^'scale'. | |
3257 | * all without any floating-point arithmetic. | |
3258 | */ | |
3259 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3260 | { | |
3261 | unsigned long result = 0; | |
3262 | long decimals = -1; | |
3263 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3264 | if (*cp == '.') | |
3265 | decimals = 0; | |
3266 | else if (decimals < scale) { | |
3267 | unsigned int value; | |
3268 | value = *cp - '0'; | |
3269 | result = result * 10 + value; | |
3270 | if (decimals >= 0) | |
3271 | decimals++; | |
3272 | } | |
3273 | cp++; | |
3274 | } | |
3275 | if (*cp == '\n') | |
3276 | cp++; | |
3277 | if (*cp) | |
3278 | return -EINVAL; | |
3279 | if (decimals < 0) | |
3280 | decimals = 0; | |
3281 | while (decimals < scale) { | |
3282 | result *= 10; | |
3283 | decimals ++; | |
3284 | } | |
3285 | *res = result; | |
3286 | return 0; | |
3287 | } | |
3288 | ||
3289 | ||
19052c0e N |
3290 | static void md_safemode_timeout(unsigned long data); |
3291 | ||
16f17b39 | 3292 | static ssize_t |
fd01b88c | 3293 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3294 | { |
3295 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3296 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3297 | } | |
3298 | static ssize_t | |
fd01b88c | 3299 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3300 | { |
16f17b39 | 3301 | unsigned long msec; |
97ce0a7f | 3302 | |
72e02075 | 3303 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3304 | return -EINVAL; |
16f17b39 N |
3305 | if (msec == 0) |
3306 | mddev->safemode_delay = 0; | |
3307 | else { | |
19052c0e | 3308 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
3309 | mddev->safemode_delay = (msec*HZ)/1000; |
3310 | if (mddev->safemode_delay == 0) | |
3311 | mddev->safemode_delay = 1; | |
19052c0e N |
3312 | if (mddev->safemode_delay < old_delay) |
3313 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
3314 | } |
3315 | return len; | |
3316 | } | |
3317 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3318 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3319 | |
eae1701f | 3320 | static ssize_t |
fd01b88c | 3321 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3322 | { |
84fc4b56 | 3323 | struct md_personality *p = mddev->pers; |
d9d166c2 | 3324 | if (p) |
eae1701f | 3325 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
3326 | else if (mddev->clevel[0]) |
3327 | return sprintf(page, "%s\n", mddev->clevel); | |
3328 | else if (mddev->level != LEVEL_NONE) | |
3329 | return sprintf(page, "%d\n", mddev->level); | |
3330 | else | |
3331 | return 0; | |
eae1701f N |
3332 | } |
3333 | ||
d9d166c2 | 3334 | static ssize_t |
fd01b88c | 3335 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3336 | { |
f2859af6 | 3337 | char clevel[16]; |
20a49ff6 | 3338 | ssize_t rv = len; |
84fc4b56 | 3339 | struct md_personality *pers; |
f2859af6 | 3340 | long level; |
245f46c2 | 3341 | void *priv; |
3cb03002 | 3342 | struct md_rdev *rdev; |
245f46c2 N |
3343 | |
3344 | if (mddev->pers == NULL) { | |
3345 | if (len == 0) | |
3346 | return 0; | |
3347 | if (len >= sizeof(mddev->clevel)) | |
3348 | return -ENOSPC; | |
3349 | strncpy(mddev->clevel, buf, len); | |
3350 | if (mddev->clevel[len-1] == '\n') | |
3351 | len--; | |
3352 | mddev->clevel[len] = 0; | |
3353 | mddev->level = LEVEL_NONE; | |
3354 | return rv; | |
3355 | } | |
3356 | ||
3357 | /* request to change the personality. Need to ensure: | |
3358 | * - array is not engaged in resync/recovery/reshape | |
3359 | * - old personality can be suspended | |
3360 | * - new personality will access other array. | |
3361 | */ | |
3362 | ||
bb4f1e9d N |
3363 | if (mddev->sync_thread || |
3364 | mddev->reshape_position != MaxSector || | |
3365 | mddev->sysfs_active) | |
d9d166c2 | 3366 | return -EBUSY; |
245f46c2 N |
3367 | |
3368 | if (!mddev->pers->quiesce) { | |
3369 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3370 | mdname(mddev), mddev->pers->name); | |
3371 | return -EINVAL; | |
3372 | } | |
3373 | ||
3374 | /* Now find the new personality */ | |
f2859af6 | 3375 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3376 | return -EINVAL; |
f2859af6 DW |
3377 | strncpy(clevel, buf, len); |
3378 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3379 | len--; |
f2859af6 DW |
3380 | clevel[len] = 0; |
3381 | if (strict_strtol(clevel, 10, &level)) | |
3382 | level = LEVEL_NONE; | |
245f46c2 | 3383 | |
f2859af6 DW |
3384 | if (request_module("md-%s", clevel) != 0) |
3385 | request_module("md-level-%s", clevel); | |
245f46c2 | 3386 | spin_lock(&pers_lock); |
f2859af6 | 3387 | pers = find_pers(level, clevel); |
245f46c2 N |
3388 | if (!pers || !try_module_get(pers->owner)) { |
3389 | spin_unlock(&pers_lock); | |
f2859af6 | 3390 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3391 | return -EINVAL; |
3392 | } | |
3393 | spin_unlock(&pers_lock); | |
3394 | ||
3395 | if (pers == mddev->pers) { | |
3396 | /* Nothing to do! */ | |
3397 | module_put(pers->owner); | |
3398 | return rv; | |
3399 | } | |
3400 | if (!pers->takeover) { | |
3401 | module_put(pers->owner); | |
3402 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3403 | mdname(mddev), clevel); |
245f46c2 N |
3404 | return -EINVAL; |
3405 | } | |
3406 | ||
e93f68a1 N |
3407 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3408 | rdev->new_raid_disk = rdev->raid_disk; | |
3409 | ||
245f46c2 N |
3410 | /* ->takeover must set new_* and/or delta_disks |
3411 | * if it succeeds, and may set them when it fails. | |
3412 | */ | |
3413 | priv = pers->takeover(mddev); | |
3414 | if (IS_ERR(priv)) { | |
3415 | mddev->new_level = mddev->level; | |
3416 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3417 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3418 | mddev->raid_disks -= mddev->delta_disks; |
3419 | mddev->delta_disks = 0; | |
3420 | module_put(pers->owner); | |
3421 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3422 | mdname(mddev), clevel); |
245f46c2 N |
3423 | return PTR_ERR(priv); |
3424 | } | |
3425 | ||
3426 | /* Looks like we have a winner */ | |
3427 | mddev_suspend(mddev); | |
3428 | mddev->pers->stop(mddev); | |
a64c876f N |
3429 | |
3430 | if (mddev->pers->sync_request == NULL && | |
3431 | pers->sync_request != NULL) { | |
3432 | /* need to add the md_redundancy_group */ | |
3433 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3434 | printk(KERN_WARNING | |
3435 | "md: cannot register extra attributes for %s\n", | |
3436 | mdname(mddev)); | |
19fdb9ee | 3437 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3438 | } |
3439 | if (mddev->pers->sync_request != NULL && | |
3440 | pers->sync_request == NULL) { | |
3441 | /* need to remove the md_redundancy_group */ | |
3442 | if (mddev->to_remove == NULL) | |
3443 | mddev->to_remove = &md_redundancy_group; | |
3444 | } | |
3445 | ||
54071b38 TM |
3446 | if (mddev->pers->sync_request == NULL && |
3447 | mddev->external) { | |
3448 | /* We are converting from a no-redundancy array | |
3449 | * to a redundancy array and metadata is managed | |
3450 | * externally so we need to be sure that writes | |
3451 | * won't block due to a need to transition | |
3452 | * clean->dirty | |
3453 | * until external management is started. | |
3454 | */ | |
3455 | mddev->in_sync = 0; | |
3456 | mddev->safemode_delay = 0; | |
3457 | mddev->safemode = 0; | |
3458 | } | |
3459 | ||
e93f68a1 | 3460 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
e93f68a1 N |
3461 | if (rdev->raid_disk < 0) |
3462 | continue; | |
bf2cb0da | 3463 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3464 | rdev->new_raid_disk = -1; |
3465 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3466 | continue; | |
36fad858 | 3467 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 N |
3468 | } |
3469 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3470 | if (rdev->raid_disk < 0) | |
3471 | continue; | |
3472 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3473 | continue; | |
3474 | rdev->raid_disk = rdev->new_raid_disk; | |
3475 | if (rdev->raid_disk < 0) | |
3a981b03 | 3476 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3477 | else { |
36fad858 NK |
3478 | if (sysfs_link_rdev(mddev, rdev)) |
3479 | printk(KERN_WARNING "md: cannot register rd%d" | |
3480 | " for %s after level change\n", | |
3481 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3482 | } |
e93f68a1 N |
3483 | } |
3484 | ||
3485 | module_put(mddev->pers->owner); | |
245f46c2 N |
3486 | mddev->pers = pers; |
3487 | mddev->private = priv; | |
3488 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3489 | mddev->level = mddev->new_level; | |
3490 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3491 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3492 | mddev->delta_disks = 0; |
fee68723 | 3493 | mddev->degraded = 0; |
9af204cf TM |
3494 | if (mddev->pers->sync_request == NULL) { |
3495 | /* this is now an array without redundancy, so | |
3496 | * it must always be in_sync | |
3497 | */ | |
3498 | mddev->in_sync = 1; | |
3499 | del_timer_sync(&mddev->safemode_timer); | |
3500 | } | |
245f46c2 N |
3501 | pers->run(mddev); |
3502 | mddev_resume(mddev); | |
3503 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3504 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3505 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3506 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3507 | md_new_event(mddev); |
d9d166c2 N |
3508 | return rv; |
3509 | } | |
3510 | ||
3511 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3512 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3513 | |
d4dbd025 N |
3514 | |
3515 | static ssize_t | |
fd01b88c | 3516 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3517 | { |
3518 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3519 | if (mddev->reshape_position != MaxSector && |
3520 | mddev->layout != mddev->new_layout) | |
3521 | return sprintf(page, "%d (%d)\n", | |
3522 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3523 | return sprintf(page, "%d\n", mddev->layout); |
3524 | } | |
3525 | ||
3526 | static ssize_t | |
fd01b88c | 3527 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 N |
3528 | { |
3529 | char *e; | |
3530 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3531 | |
3532 | if (!*buf || (*e && *e != '\n')) | |
3533 | return -EINVAL; | |
3534 | ||
b3546035 N |
3535 | if (mddev->pers) { |
3536 | int err; | |
50ac168a | 3537 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3538 | return -EBUSY; |
597a711b | 3539 | mddev->new_layout = n; |
50ac168a | 3540 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3541 | if (err) { |
3542 | mddev->new_layout = mddev->layout; | |
b3546035 | 3543 | return err; |
597a711b | 3544 | } |
b3546035 | 3545 | } else { |
08a02ecd | 3546 | mddev->new_layout = n; |
b3546035 N |
3547 | if (mddev->reshape_position == MaxSector) |
3548 | mddev->layout = n; | |
3549 | } | |
d4dbd025 N |
3550 | return len; |
3551 | } | |
3552 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3553 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3554 | |
3555 | ||
eae1701f | 3556 | static ssize_t |
fd01b88c | 3557 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3558 | { |
bb636547 N |
3559 | if (mddev->raid_disks == 0) |
3560 | return 0; | |
08a02ecd N |
3561 | if (mddev->reshape_position != MaxSector && |
3562 | mddev->delta_disks != 0) | |
3563 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3564 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3565 | return sprintf(page, "%d\n", mddev->raid_disks); |
3566 | } | |
3567 | ||
fd01b88c | 3568 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3569 | |
3570 | static ssize_t | |
fd01b88c | 3571 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3572 | { |
da943b99 N |
3573 | char *e; |
3574 | int rv = 0; | |
3575 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3576 | ||
3577 | if (!*buf || (*e && *e != '\n')) | |
3578 | return -EINVAL; | |
3579 | ||
3580 | if (mddev->pers) | |
3581 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3582 | else if (mddev->reshape_position != MaxSector) { |
3583 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3584 | mddev->delta_disks = n - olddisks; | |
3585 | mddev->raid_disks = n; | |
3586 | } else | |
da943b99 N |
3587 | mddev->raid_disks = n; |
3588 | return rv ? rv : len; | |
3589 | } | |
3590 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3591 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3592 | |
3b34380a | 3593 | static ssize_t |
fd01b88c | 3594 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3595 | { |
08a02ecd | 3596 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3597 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3598 | return sprintf(page, "%d (%d)\n", | |
3599 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3600 | mddev->chunk_sectors << 9); |
3601 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3602 | } |
3603 | ||
3604 | static ssize_t | |
fd01b88c | 3605 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3606 | { |
3b34380a N |
3607 | char *e; |
3608 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3609 | ||
3b34380a N |
3610 | if (!*buf || (*e && *e != '\n')) |
3611 | return -EINVAL; | |
3612 | ||
b3546035 N |
3613 | if (mddev->pers) { |
3614 | int err; | |
50ac168a | 3615 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3616 | return -EBUSY; |
597a711b | 3617 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3618 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3619 | if (err) { |
3620 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3621 | return err; |
597a711b | 3622 | } |
b3546035 | 3623 | } else { |
664e7c41 | 3624 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3625 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3626 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3627 | } |
3b34380a N |
3628 | return len; |
3629 | } | |
3630 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3631 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3632 | |
a94213b1 | 3633 | static ssize_t |
fd01b88c | 3634 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3635 | { |
d1a7c503 N |
3636 | if (mddev->recovery_cp == MaxSector) |
3637 | return sprintf(page, "none\n"); | |
a94213b1 N |
3638 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3639 | } | |
3640 | ||
3641 | static ssize_t | |
fd01b88c | 3642 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3643 | { |
a94213b1 N |
3644 | char *e; |
3645 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3646 | ||
b098636c | 3647 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3648 | return -EBUSY; |
06e3c817 DW |
3649 | if (cmd_match(buf, "none")) |
3650 | n = MaxSector; | |
3651 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3652 | return -EINVAL; |
3653 | ||
3654 | mddev->recovery_cp = n; | |
3655 | return len; | |
3656 | } | |
3657 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3658 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3659 | |
9e653b63 N |
3660 | /* |
3661 | * The array state can be: | |
3662 | * | |
3663 | * clear | |
3664 | * No devices, no size, no level | |
3665 | * Equivalent to STOP_ARRAY ioctl | |
3666 | * inactive | |
3667 | * May have some settings, but array is not active | |
3668 | * all IO results in error | |
3669 | * When written, doesn't tear down array, but just stops it | |
3670 | * suspended (not supported yet) | |
3671 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3672 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3673 | * readonly |
3674 | * no resync can happen. no superblocks get written. | |
3675 | * write requests fail | |
3676 | * read-auto | |
3677 | * like readonly, but behaves like 'clean' on a write request. | |
3678 | * | |
3679 | * clean - no pending writes, but otherwise active. | |
3680 | * When written to inactive array, starts without resync | |
3681 | * If a write request arrives then | |
3682 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3683 | * if not known, block and switch to write-pending | |
3684 | * If written to an active array that has pending writes, then fails. | |
3685 | * active | |
3686 | * fully active: IO and resync can be happening. | |
3687 | * When written to inactive array, starts with resync | |
3688 | * | |
3689 | * write-pending | |
3690 | * clean, but writes are blocked waiting for 'active' to be written. | |
3691 | * | |
3692 | * active-idle | |
3693 | * like active, but no writes have been seen for a while (100msec). | |
3694 | * | |
3695 | */ | |
3696 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3697 | write_pending, active_idle, bad_word}; | |
05381954 | 3698 | static char *array_states[] = { |
9e653b63 N |
3699 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3700 | "write-pending", "active-idle", NULL }; | |
3701 | ||
3702 | static int match_word(const char *word, char **list) | |
3703 | { | |
3704 | int n; | |
3705 | for (n=0; list[n]; n++) | |
3706 | if (cmd_match(word, list[n])) | |
3707 | break; | |
3708 | return n; | |
3709 | } | |
3710 | ||
3711 | static ssize_t | |
fd01b88c | 3712 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3713 | { |
3714 | enum array_state st = inactive; | |
3715 | ||
3716 | if (mddev->pers) | |
3717 | switch(mddev->ro) { | |
3718 | case 1: | |
3719 | st = readonly; | |
3720 | break; | |
3721 | case 2: | |
3722 | st = read_auto; | |
3723 | break; | |
3724 | case 0: | |
3725 | if (mddev->in_sync) | |
3726 | st = clean; | |
070dc6dd | 3727 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3728 | st = write_pending; |
9e653b63 N |
3729 | else if (mddev->safemode) |
3730 | st = active_idle; | |
3731 | else | |
3732 | st = active; | |
3733 | } | |
3734 | else { | |
3735 | if (list_empty(&mddev->disks) && | |
3736 | mddev->raid_disks == 0 && | |
58c0fed4 | 3737 | mddev->dev_sectors == 0) |
9e653b63 N |
3738 | st = clear; |
3739 | else | |
3740 | st = inactive; | |
3741 | } | |
3742 | return sprintf(page, "%s\n", array_states[st]); | |
3743 | } | |
3744 | ||
fd01b88c N |
3745 | static int do_md_stop(struct mddev * mddev, int ro, int is_open); |
3746 | static int md_set_readonly(struct mddev * mddev, int is_open); | |
3747 | static int do_md_run(struct mddev * mddev); | |
3748 | static int restart_array(struct mddev *mddev); | |
9e653b63 N |
3749 | |
3750 | static ssize_t | |
fd01b88c | 3751 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 N |
3752 | { |
3753 | int err = -EINVAL; | |
3754 | enum array_state st = match_word(buf, array_states); | |
3755 | switch(st) { | |
3756 | case bad_word: | |
3757 | break; | |
3758 | case clear: | |
3759 | /* stopping an active array */ | |
f2ea68cf | 3760 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3761 | return -EBUSY; |
df5b20cf | 3762 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3763 | break; |
3764 | case inactive: | |
3765 | /* stopping an active array */ | |
3766 | if (mddev->pers) { | |
f2ea68cf | 3767 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3768 | return -EBUSY; |
df5b20cf | 3769 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3770 | } else |
3771 | err = 0; /* already inactive */ | |
9e653b63 N |
3772 | break; |
3773 | case suspended: | |
3774 | break; /* not supported yet */ | |
3775 | case readonly: | |
3776 | if (mddev->pers) | |
a4bd82d0 | 3777 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3778 | else { |
3779 | mddev->ro = 1; | |
648b629e | 3780 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3781 | err = do_md_run(mddev); |
3782 | } | |
3783 | break; | |
3784 | case read_auto: | |
9e653b63 | 3785 | if (mddev->pers) { |
80268ee9 | 3786 | if (mddev->ro == 0) |
a4bd82d0 | 3787 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3788 | else if (mddev->ro == 1) |
648b629e N |
3789 | err = restart_array(mddev); |
3790 | if (err == 0) { | |
3791 | mddev->ro = 2; | |
3792 | set_disk_ro(mddev->gendisk, 0); | |
3793 | } | |
9e653b63 N |
3794 | } else { |
3795 | mddev->ro = 2; | |
3796 | err = do_md_run(mddev); | |
3797 | } | |
3798 | break; | |
3799 | case clean: | |
3800 | if (mddev->pers) { | |
3801 | restart_array(mddev); | |
3802 | spin_lock_irq(&mddev->write_lock); | |
3803 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3804 | if (mddev->in_sync == 0) { |
3805 | mddev->in_sync = 1; | |
31a59e34 N |
3806 | if (mddev->safemode == 1) |
3807 | mddev->safemode = 0; | |
070dc6dd | 3808 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3809 | } |
3810 | err = 0; | |
3811 | } else | |
3812 | err = -EBUSY; | |
9e653b63 | 3813 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3814 | } else |
3815 | err = -EINVAL; | |
9e653b63 N |
3816 | break; |
3817 | case active: | |
3818 | if (mddev->pers) { | |
3819 | restart_array(mddev); | |
070dc6dd | 3820 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3821 | wake_up(&mddev->sb_wait); |
3822 | err = 0; | |
3823 | } else { | |
3824 | mddev->ro = 0; | |
648b629e | 3825 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3826 | err = do_md_run(mddev); |
3827 | } | |
3828 | break; | |
3829 | case write_pending: | |
3830 | case active_idle: | |
3831 | /* these cannot be set */ | |
3832 | break; | |
3833 | } | |
3834 | if (err) | |
3835 | return err; | |
0fd62b86 | 3836 | else { |
1d23f178 N |
3837 | if (mddev->hold_active == UNTIL_IOCTL) |
3838 | mddev->hold_active = 0; | |
00bcb4ac | 3839 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3840 | return len; |
0fd62b86 | 3841 | } |
9e653b63 | 3842 | } |
80ca3a44 N |
3843 | static struct md_sysfs_entry md_array_state = |
3844 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3845 | |
1e50915f | 3846 | static ssize_t |
fd01b88c | 3847 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3848 | return sprintf(page, "%d\n", |
3849 | atomic_read(&mddev->max_corr_read_errors)); | |
3850 | } | |
3851 | ||
3852 | static ssize_t | |
fd01b88c | 3853 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f RB |
3854 | { |
3855 | char *e; | |
3856 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3857 | ||
3858 | if (*buf && (*e == 0 || *e == '\n')) { | |
3859 | atomic_set(&mddev->max_corr_read_errors, n); | |
3860 | return len; | |
3861 | } | |
3862 | return -EINVAL; | |
3863 | } | |
3864 | ||
3865 | static struct md_sysfs_entry max_corr_read_errors = | |
3866 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3867 | max_corrected_read_errors_store); | |
3868 | ||
6d7ff738 | 3869 | static ssize_t |
fd01b88c | 3870 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3871 | { |
3872 | return -EINVAL; | |
3873 | } | |
3874 | ||
3875 | static ssize_t | |
fd01b88c | 3876 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
3877 | { |
3878 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3879 | /* The new device is added to the array. | |
3880 | * If the array has a persistent superblock, we read the | |
3881 | * superblock to initialise info and check validity. | |
3882 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3883 | * which mainly checks size. | |
3884 | */ | |
3885 | char *e; | |
3886 | int major = simple_strtoul(buf, &e, 10); | |
3887 | int minor; | |
3888 | dev_t dev; | |
3cb03002 | 3889 | struct md_rdev *rdev; |
6d7ff738 N |
3890 | int err; |
3891 | ||
3892 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3893 | return -EINVAL; | |
3894 | minor = simple_strtoul(e+1, &e, 10); | |
3895 | if (*e && *e != '\n') | |
3896 | return -EINVAL; | |
3897 | dev = MKDEV(major, minor); | |
3898 | if (major != MAJOR(dev) || | |
3899 | minor != MINOR(dev)) | |
3900 | return -EOVERFLOW; | |
3901 | ||
3902 | ||
3903 | if (mddev->persistent) { | |
3904 | rdev = md_import_device(dev, mddev->major_version, | |
3905 | mddev->minor_version); | |
3906 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
3907 | struct md_rdev *rdev0 |
3908 | = list_entry(mddev->disks.next, | |
3909 | struct md_rdev, same_set); | |
6d7ff738 N |
3910 | err = super_types[mddev->major_version] |
3911 | .load_super(rdev, rdev0, mddev->minor_version); | |
3912 | if (err < 0) | |
3913 | goto out; | |
3914 | } | |
c5d79adb N |
3915 | } else if (mddev->external) |
3916 | rdev = md_import_device(dev, -2, -1); | |
3917 | else | |
6d7ff738 N |
3918 | rdev = md_import_device(dev, -1, -1); |
3919 | ||
3920 | if (IS_ERR(rdev)) | |
3921 | return PTR_ERR(rdev); | |
3922 | err = bind_rdev_to_array(rdev, mddev); | |
3923 | out: | |
3924 | if (err) | |
3925 | export_rdev(rdev); | |
3926 | return err ? err : len; | |
3927 | } | |
3928 | ||
3929 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3930 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3931 | |
9b1d1dac | 3932 | static ssize_t |
fd01b88c | 3933 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
3934 | { |
3935 | char *end; | |
3936 | unsigned long chunk, end_chunk; | |
3937 | ||
3938 | if (!mddev->bitmap) | |
3939 | goto out; | |
3940 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3941 | while (*buf) { | |
3942 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3943 | if (buf == end) break; | |
3944 | if (*end == '-') { /* range */ | |
3945 | buf = end + 1; | |
3946 | end_chunk = simple_strtoul(buf, &end, 0); | |
3947 | if (buf == end) break; | |
3948 | } | |
3949 | if (*end && !isspace(*end)) break; | |
3950 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3951 | buf = skip_spaces(end); |
9b1d1dac PC |
3952 | } |
3953 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3954 | out: | |
3955 | return len; | |
3956 | } | |
3957 | ||
3958 | static struct md_sysfs_entry md_bitmap = | |
3959 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3960 | ||
a35b0d69 | 3961 | static ssize_t |
fd01b88c | 3962 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 3963 | { |
58c0fed4 AN |
3964 | return sprintf(page, "%llu\n", |
3965 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3966 | } |
3967 | ||
fd01b88c | 3968 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
3969 | |
3970 | static ssize_t | |
fd01b88c | 3971 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
3972 | { |
3973 | /* If array is inactive, we can reduce the component size, but | |
3974 | * not increase it (except from 0). | |
3975 | * If array is active, we can try an on-line resize | |
3976 | */ | |
b522adcd DW |
3977 | sector_t sectors; |
3978 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3979 | |
58c0fed4 AN |
3980 | if (err < 0) |
3981 | return err; | |
a35b0d69 | 3982 | if (mddev->pers) { |
58c0fed4 | 3983 | err = update_size(mddev, sectors); |
850b2b42 | 3984 | md_update_sb(mddev, 1); |
a35b0d69 | 3985 | } else { |
58c0fed4 AN |
3986 | if (mddev->dev_sectors == 0 || |
3987 | mddev->dev_sectors > sectors) | |
3988 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3989 | else |
3990 | err = -ENOSPC; | |
3991 | } | |
3992 | return err ? err : len; | |
3993 | } | |
3994 | ||
3995 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3996 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3997 | |
8bb93aac N |
3998 | |
3999 | /* Metdata version. | |
e691063a N |
4000 | * This is one of |
4001 | * 'none' for arrays with no metadata (good luck...) | |
4002 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
4003 | * or N.M for internally known formats |
4004 | */ | |
4005 | static ssize_t | |
fd01b88c | 4006 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
4007 | { |
4008 | if (mddev->persistent) | |
4009 | return sprintf(page, "%d.%d\n", | |
4010 | mddev->major_version, mddev->minor_version); | |
e691063a N |
4011 | else if (mddev->external) |
4012 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
4013 | else |
4014 | return sprintf(page, "none\n"); | |
4015 | } | |
4016 | ||
4017 | static ssize_t | |
fd01b88c | 4018 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
4019 | { |
4020 | int major, minor; | |
4021 | char *e; | |
ea43ddd8 N |
4022 | /* Changing the details of 'external' metadata is |
4023 | * always permitted. Otherwise there must be | |
4024 | * no devices attached to the array. | |
4025 | */ | |
4026 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
4027 | ; | |
4028 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
4029 | return -EBUSY; |
4030 | ||
4031 | if (cmd_match(buf, "none")) { | |
4032 | mddev->persistent = 0; | |
e691063a N |
4033 | mddev->external = 0; |
4034 | mddev->major_version = 0; | |
4035 | mddev->minor_version = 90; | |
4036 | return len; | |
4037 | } | |
4038 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 4039 | size_t namelen = len-9; |
e691063a N |
4040 | if (namelen >= sizeof(mddev->metadata_type)) |
4041 | namelen = sizeof(mddev->metadata_type)-1; | |
4042 | strncpy(mddev->metadata_type, buf+9, namelen); | |
4043 | mddev->metadata_type[namelen] = 0; | |
4044 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4045 | mddev->metadata_type[--namelen] = 0; | |
4046 | mddev->persistent = 0; | |
4047 | mddev->external = 1; | |
8bb93aac N |
4048 | mddev->major_version = 0; |
4049 | mddev->minor_version = 90; | |
4050 | return len; | |
4051 | } | |
4052 | major = simple_strtoul(buf, &e, 10); | |
4053 | if (e==buf || *e != '.') | |
4054 | return -EINVAL; | |
4055 | buf = e+1; | |
4056 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4057 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 4058 | return -EINVAL; |
50511da3 | 4059 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
4060 | return -ENOENT; |
4061 | mddev->major_version = major; | |
4062 | mddev->minor_version = minor; | |
4063 | mddev->persistent = 1; | |
e691063a | 4064 | mddev->external = 0; |
8bb93aac N |
4065 | return len; |
4066 | } | |
4067 | ||
4068 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 4069 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4070 | |
24dd469d | 4071 | static ssize_t |
fd01b88c | 4072 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4073 | { |
7eec314d | 4074 | char *type = "idle"; |
b6a9ce68 N |
4075 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
4076 | type = "frozen"; | |
4077 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 4078 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
4079 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4080 | type = "reshape"; | |
4081 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
4082 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
4083 | type = "resync"; | |
4084 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
4085 | type = "check"; | |
4086 | else | |
4087 | type = "repair"; | |
72a23c21 | 4088 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
4089 | type = "recover"; |
4090 | } | |
4091 | return sprintf(page, "%s\n", type); | |
4092 | } | |
4093 | ||
fd01b88c | 4094 | static void reap_sync_thread(struct mddev *mddev); |
7ebc0be7 | 4095 | |
24dd469d | 4096 | static ssize_t |
fd01b88c | 4097 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4098 | { |
7eec314d N |
4099 | if (!mddev->pers || !mddev->pers->sync_request) |
4100 | return -EINVAL; | |
4101 | ||
b6a9ce68 N |
4102 | if (cmd_match(page, "frozen")) |
4103 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4104 | else | |
4105 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4106 | ||
4107 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
4108 | if (mddev->sync_thread) { |
4109 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 4110 | reap_sync_thread(mddev); |
7eec314d | 4111 | } |
03c902e1 N |
4112 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4113 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4114 | return -EBUSY; |
72a23c21 NB |
4115 | else if (cmd_match(page, "resync")) |
4116 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4117 | else if (cmd_match(page, "recover")) { | |
4118 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4119 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4120 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4121 | int err; |
4122 | if (mddev->pers->start_reshape == NULL) | |
4123 | return -EINVAL; | |
4124 | err = mddev->pers->start_reshape(mddev); | |
4125 | if (err) | |
4126 | return err; | |
a99ac971 | 4127 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4128 | } else { |
bce74dac | 4129 | if (cmd_match(page, "check")) |
7eec314d | 4130 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4131 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4132 | return -EINVAL; |
4133 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4134 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4135 | } |
03c902e1 | 4136 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4137 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4138 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4139 | return len; |
4140 | } | |
4141 | ||
9d88883e | 4142 | static ssize_t |
fd01b88c | 4143 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4144 | { |
4145 | return sprintf(page, "%llu\n", | |
4146 | (unsigned long long) mddev->resync_mismatches); | |
4147 | } | |
4148 | ||
80ca3a44 N |
4149 | static struct md_sysfs_entry md_scan_mode = |
4150 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 4151 | |
96de1e66 | 4152 | |
80ca3a44 | 4153 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4154 | |
88202a0c | 4155 | static ssize_t |
fd01b88c | 4156 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4157 | { |
4158 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4159 | mddev->sync_speed_min ? "local": "system"); | |
4160 | } | |
4161 | ||
4162 | static ssize_t | |
fd01b88c | 4163 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4164 | { |
4165 | int min; | |
4166 | char *e; | |
4167 | if (strncmp(buf, "system", 6)==0) { | |
4168 | mddev->sync_speed_min = 0; | |
4169 | return len; | |
4170 | } | |
4171 | min = simple_strtoul(buf, &e, 10); | |
4172 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4173 | return -EINVAL; | |
4174 | mddev->sync_speed_min = min; | |
4175 | return len; | |
4176 | } | |
4177 | ||
4178 | static struct md_sysfs_entry md_sync_min = | |
4179 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4180 | ||
4181 | static ssize_t | |
fd01b88c | 4182 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4183 | { |
4184 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4185 | mddev->sync_speed_max ? "local": "system"); | |
4186 | } | |
4187 | ||
4188 | static ssize_t | |
fd01b88c | 4189 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4190 | { |
4191 | int max; | |
4192 | char *e; | |
4193 | if (strncmp(buf, "system", 6)==0) { | |
4194 | mddev->sync_speed_max = 0; | |
4195 | return len; | |
4196 | } | |
4197 | max = simple_strtoul(buf, &e, 10); | |
4198 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4199 | return -EINVAL; | |
4200 | mddev->sync_speed_max = max; | |
4201 | return len; | |
4202 | } | |
4203 | ||
4204 | static struct md_sysfs_entry md_sync_max = | |
4205 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4206 | ||
d7f3d291 | 4207 | static ssize_t |
fd01b88c | 4208 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4209 | { |
4210 | return sprintf(page, "%d\n", mddev->degraded); | |
4211 | } | |
4212 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4213 | |
90b08710 | 4214 | static ssize_t |
fd01b88c | 4215 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4216 | { |
4217 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4218 | } | |
4219 | ||
4220 | static ssize_t | |
fd01b88c | 4221 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4222 | { |
4223 | long n; | |
4224 | ||
4225 | if (strict_strtol(buf, 10, &n)) | |
4226 | return -EINVAL; | |
4227 | ||
4228 | if (n != 0 && n != 1) | |
4229 | return -EINVAL; | |
4230 | ||
4231 | mddev->parallel_resync = n; | |
4232 | ||
4233 | if (mddev->sync_thread) | |
4234 | wake_up(&resync_wait); | |
4235 | ||
4236 | return len; | |
4237 | } | |
4238 | ||
4239 | /* force parallel resync, even with shared block devices */ | |
4240 | static struct md_sysfs_entry md_sync_force_parallel = | |
4241 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4242 | sync_force_parallel_show, sync_force_parallel_store); | |
4243 | ||
88202a0c | 4244 | static ssize_t |
fd01b88c | 4245 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4246 | { |
4247 | unsigned long resync, dt, db; | |
d1a7c503 N |
4248 | if (mddev->curr_resync == 0) |
4249 | return sprintf(page, "none\n"); | |
9687a60c AN |
4250 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4251 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4252 | if (!dt) dt++; |
9687a60c AN |
4253 | db = resync - mddev->resync_mark_cnt; |
4254 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4255 | } |
4256 | ||
80ca3a44 | 4257 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4258 | |
4259 | static ssize_t | |
fd01b88c | 4260 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4261 | { |
13ae864b | 4262 | unsigned long long max_sectors, resync; |
88202a0c | 4263 | |
acb180b0 N |
4264 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4265 | return sprintf(page, "none\n"); | |
4266 | ||
88202a0c | 4267 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 4268 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4269 | else |
58c0fed4 | 4270 | max_sectors = mddev->dev_sectors; |
88202a0c | 4271 | |
acb180b0 | 4272 | resync = mddev->curr_resync_completed; |
13ae864b | 4273 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4274 | } |
4275 | ||
80ca3a44 | 4276 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4277 | |
5e96ee65 | 4278 | static ssize_t |
fd01b88c | 4279 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4280 | { |
4281 | return sprintf(page, "%llu\n", | |
4282 | (unsigned long long)mddev->resync_min); | |
4283 | } | |
4284 | static ssize_t | |
fd01b88c | 4285 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4286 | { |
4287 | unsigned long long min; | |
4288 | if (strict_strtoull(buf, 10, &min)) | |
4289 | return -EINVAL; | |
4290 | if (min > mddev->resync_max) | |
4291 | return -EINVAL; | |
4292 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4293 | return -EBUSY; | |
4294 | ||
4295 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4296 | if (mddev->chunk_sectors) { |
2ac06c33 | 4297 | sector_t temp = min; |
9d8f0363 | 4298 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4299 | return -EINVAL; |
4300 | } | |
4301 | mddev->resync_min = min; | |
4302 | ||
4303 | return len; | |
4304 | } | |
4305 | ||
4306 | static struct md_sysfs_entry md_min_sync = | |
4307 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4308 | ||
c6207277 | 4309 | static ssize_t |
fd01b88c | 4310 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4311 | { |
4312 | if (mddev->resync_max == MaxSector) | |
4313 | return sprintf(page, "max\n"); | |
4314 | else | |
4315 | return sprintf(page, "%llu\n", | |
4316 | (unsigned long long)mddev->resync_max); | |
4317 | } | |
4318 | static ssize_t | |
fd01b88c | 4319 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 N |
4320 | { |
4321 | if (strncmp(buf, "max", 3) == 0) | |
4322 | mddev->resync_max = MaxSector; | |
4323 | else { | |
5e96ee65 NB |
4324 | unsigned long long max; |
4325 | if (strict_strtoull(buf, 10, &max)) | |
4326 | return -EINVAL; | |
4327 | if (max < mddev->resync_min) | |
c6207277 N |
4328 | return -EINVAL; |
4329 | if (max < mddev->resync_max && | |
4d484a4a | 4330 | mddev->ro == 0 && |
c6207277 N |
4331 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4332 | return -EBUSY; | |
4333 | ||
4334 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4335 | if (mddev->chunk_sectors) { |
2ac06c33 | 4336 | sector_t temp = max; |
9d8f0363 | 4337 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4338 | return -EINVAL; |
4339 | } | |
4340 | mddev->resync_max = max; | |
4341 | } | |
4342 | wake_up(&mddev->recovery_wait); | |
4343 | return len; | |
4344 | } | |
4345 | ||
4346 | static struct md_sysfs_entry md_max_sync = | |
4347 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4348 | ||
e464eafd | 4349 | static ssize_t |
fd01b88c | 4350 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4351 | { |
4352 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4353 | } | |
4354 | ||
4355 | static ssize_t | |
fd01b88c | 4356 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4357 | { |
4358 | char *e; | |
4359 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4360 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4361 | |
b8d966ef N |
4362 | if (mddev->pers == NULL || |
4363 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4364 | return -EINVAL; |
4365 | if (buf == e || (*e && *e != '\n')) | |
4366 | return -EINVAL; | |
23ddff37 N |
4367 | |
4368 | mddev->suspend_lo = new; | |
4369 | if (new >= old) | |
4370 | /* Shrinking suspended region */ | |
e464eafd | 4371 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4372 | else { |
4373 | /* Expanding suspended region - need to wait */ | |
4374 | mddev->pers->quiesce(mddev, 1); | |
4375 | mddev->pers->quiesce(mddev, 0); | |
4376 | } | |
4377 | return len; | |
e464eafd N |
4378 | } |
4379 | static struct md_sysfs_entry md_suspend_lo = | |
4380 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4381 | ||
4382 | ||
4383 | static ssize_t | |
fd01b88c | 4384 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4385 | { |
4386 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4387 | } | |
4388 | ||
4389 | static ssize_t | |
fd01b88c | 4390 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4391 | { |
4392 | char *e; | |
4393 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4394 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4395 | |
b8d966ef N |
4396 | if (mddev->pers == NULL || |
4397 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4398 | return -EINVAL; |
4399 | if (buf == e || (*e && *e != '\n')) | |
4400 | return -EINVAL; | |
23ddff37 N |
4401 | |
4402 | mddev->suspend_hi = new; | |
4403 | if (new <= old) | |
4404 | /* Shrinking suspended region */ | |
4405 | mddev->pers->quiesce(mddev, 2); | |
4406 | else { | |
4407 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4408 | mddev->pers->quiesce(mddev, 1); |
4409 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4410 | } |
4411 | return len; | |
e464eafd N |
4412 | } |
4413 | static struct md_sysfs_entry md_suspend_hi = | |
4414 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4415 | ||
08a02ecd | 4416 | static ssize_t |
fd01b88c | 4417 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4418 | { |
4419 | if (mddev->reshape_position != MaxSector) | |
4420 | return sprintf(page, "%llu\n", | |
4421 | (unsigned long long)mddev->reshape_position); | |
4422 | strcpy(page, "none\n"); | |
4423 | return 5; | |
4424 | } | |
4425 | ||
4426 | static ssize_t | |
fd01b88c | 4427 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd N |
4428 | { |
4429 | char *e; | |
4430 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4431 | if (mddev->pers) | |
4432 | return -EBUSY; | |
4433 | if (buf == e || (*e && *e != '\n')) | |
4434 | return -EINVAL; | |
4435 | mddev->reshape_position = new; | |
4436 | mddev->delta_disks = 0; | |
4437 | mddev->new_level = mddev->level; | |
4438 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4439 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4440 | return len; |
4441 | } | |
4442 | ||
4443 | static struct md_sysfs_entry md_reshape_position = | |
4444 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4445 | reshape_position_store); | |
4446 | ||
b522adcd | 4447 | static ssize_t |
fd01b88c | 4448 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4449 | { |
4450 | if (mddev->external_size) | |
4451 | return sprintf(page, "%llu\n", | |
4452 | (unsigned long long)mddev->array_sectors/2); | |
4453 | else | |
4454 | return sprintf(page, "default\n"); | |
4455 | } | |
4456 | ||
4457 | static ssize_t | |
fd01b88c | 4458 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4459 | { |
4460 | sector_t sectors; | |
4461 | ||
4462 | if (strncmp(buf, "default", 7) == 0) { | |
4463 | if (mddev->pers) | |
4464 | sectors = mddev->pers->size(mddev, 0, 0); | |
4465 | else | |
4466 | sectors = mddev->array_sectors; | |
4467 | ||
4468 | mddev->external_size = 0; | |
4469 | } else { | |
4470 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4471 | return -EINVAL; | |
4472 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4473 | return -E2BIG; |
b522adcd DW |
4474 | |
4475 | mddev->external_size = 1; | |
4476 | } | |
4477 | ||
4478 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4479 | if (mddev->pers) { |
4480 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4481 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4482 | } |
b522adcd DW |
4483 | return len; |
4484 | } | |
4485 | ||
4486 | static struct md_sysfs_entry md_array_size = | |
4487 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4488 | array_size_store); | |
e464eafd | 4489 | |
eae1701f N |
4490 | static struct attribute *md_default_attrs[] = { |
4491 | &md_level.attr, | |
d4dbd025 | 4492 | &md_layout.attr, |
eae1701f | 4493 | &md_raid_disks.attr, |
3b34380a | 4494 | &md_chunk_size.attr, |
a35b0d69 | 4495 | &md_size.attr, |
a94213b1 | 4496 | &md_resync_start.attr, |
8bb93aac | 4497 | &md_metadata.attr, |
6d7ff738 | 4498 | &md_new_device.attr, |
16f17b39 | 4499 | &md_safe_delay.attr, |
9e653b63 | 4500 | &md_array_state.attr, |
08a02ecd | 4501 | &md_reshape_position.attr, |
b522adcd | 4502 | &md_array_size.attr, |
1e50915f | 4503 | &max_corr_read_errors.attr, |
411036fa N |
4504 | NULL, |
4505 | }; | |
4506 | ||
4507 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4508 | &md_scan_mode.attr, |
9d88883e | 4509 | &md_mismatches.attr, |
88202a0c N |
4510 | &md_sync_min.attr, |
4511 | &md_sync_max.attr, | |
4512 | &md_sync_speed.attr, | |
90b08710 | 4513 | &md_sync_force_parallel.attr, |
88202a0c | 4514 | &md_sync_completed.attr, |
5e96ee65 | 4515 | &md_min_sync.attr, |
c6207277 | 4516 | &md_max_sync.attr, |
e464eafd N |
4517 | &md_suspend_lo.attr, |
4518 | &md_suspend_hi.attr, | |
9b1d1dac | 4519 | &md_bitmap.attr, |
d7f3d291 | 4520 | &md_degraded.attr, |
eae1701f N |
4521 | NULL, |
4522 | }; | |
411036fa N |
4523 | static struct attribute_group md_redundancy_group = { |
4524 | .name = NULL, | |
4525 | .attrs = md_redundancy_attrs, | |
4526 | }; | |
4527 | ||
eae1701f N |
4528 | |
4529 | static ssize_t | |
4530 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4531 | { | |
4532 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4533 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4534 | ssize_t rv; |
eae1701f N |
4535 | |
4536 | if (!entry->show) | |
4537 | return -EIO; | |
af8a2434 N |
4538 | spin_lock(&all_mddevs_lock); |
4539 | if (list_empty(&mddev->all_mddevs)) { | |
4540 | spin_unlock(&all_mddevs_lock); | |
4541 | return -EBUSY; | |
4542 | } | |
4543 | mddev_get(mddev); | |
4544 | spin_unlock(&all_mddevs_lock); | |
4545 | ||
5dc5cf7d IM |
4546 | rv = mddev_lock(mddev); |
4547 | if (!rv) { | |
4548 | rv = entry->show(mddev, page); | |
4549 | mddev_unlock(mddev); | |
4550 | } | |
af8a2434 | 4551 | mddev_put(mddev); |
96de1e66 | 4552 | return rv; |
eae1701f N |
4553 | } |
4554 | ||
4555 | static ssize_t | |
4556 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4557 | const char *page, size_t length) | |
4558 | { | |
4559 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4560 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4561 | ssize_t rv; |
eae1701f N |
4562 | |
4563 | if (!entry->store) | |
4564 | return -EIO; | |
67463acb N |
4565 | if (!capable(CAP_SYS_ADMIN)) |
4566 | return -EACCES; | |
af8a2434 N |
4567 | spin_lock(&all_mddevs_lock); |
4568 | if (list_empty(&mddev->all_mddevs)) { | |
4569 | spin_unlock(&all_mddevs_lock); | |
4570 | return -EBUSY; | |
4571 | } | |
4572 | mddev_get(mddev); | |
4573 | spin_unlock(&all_mddevs_lock); | |
5dc5cf7d IM |
4574 | rv = mddev_lock(mddev); |
4575 | if (!rv) { | |
4576 | rv = entry->store(mddev, page, length); | |
4577 | mddev_unlock(mddev); | |
4578 | } | |
af8a2434 | 4579 | mddev_put(mddev); |
96de1e66 | 4580 | return rv; |
eae1701f N |
4581 | } |
4582 | ||
4583 | static void md_free(struct kobject *ko) | |
4584 | { | |
fd01b88c | 4585 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4586 | |
4587 | if (mddev->sysfs_state) | |
4588 | sysfs_put(mddev->sysfs_state); | |
4589 | ||
4590 | if (mddev->gendisk) { | |
4591 | del_gendisk(mddev->gendisk); | |
4592 | put_disk(mddev->gendisk); | |
4593 | } | |
4594 | if (mddev->queue) | |
4595 | blk_cleanup_queue(mddev->queue); | |
4596 | ||
eae1701f N |
4597 | kfree(mddev); |
4598 | } | |
4599 | ||
52cf25d0 | 4600 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4601 | .show = md_attr_show, |
4602 | .store = md_attr_store, | |
4603 | }; | |
4604 | static struct kobj_type md_ktype = { | |
4605 | .release = md_free, | |
4606 | .sysfs_ops = &md_sysfs_ops, | |
4607 | .default_attrs = md_default_attrs, | |
4608 | }; | |
4609 | ||
1da177e4 LT |
4610 | int mdp_major = 0; |
4611 | ||
5fd3a17e DW |
4612 | static void mddev_delayed_delete(struct work_struct *ws) |
4613 | { | |
fd01b88c | 4614 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4615 | |
43a70507 | 4616 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4617 | kobject_del(&mddev->kobj); |
4618 | kobject_put(&mddev->kobj); | |
4619 | } | |
4620 | ||
efeb53c0 | 4621 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4622 | { |
48c9c27b | 4623 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4624 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4625 | struct gendisk *disk; |
efeb53c0 N |
4626 | int partitioned; |
4627 | int shift; | |
4628 | int unit; | |
3830c62f | 4629 | int error; |
1da177e4 LT |
4630 | |
4631 | if (!mddev) | |
efeb53c0 N |
4632 | return -ENODEV; |
4633 | ||
4634 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4635 | shift = partitioned ? MdpMinorShift : 0; | |
4636 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4637 | |
e804ac78 TH |
4638 | /* wait for any previous instance of this device to be |
4639 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4640 | */ |
e804ac78 | 4641 | flush_workqueue(md_misc_wq); |
d3374825 | 4642 | |
48c9c27b | 4643 | mutex_lock(&disks_mutex); |
0909dc44 N |
4644 | error = -EEXIST; |
4645 | if (mddev->gendisk) | |
4646 | goto abort; | |
efeb53c0 N |
4647 | |
4648 | if (name) { | |
4649 | /* Need to ensure that 'name' is not a duplicate. | |
4650 | */ | |
fd01b88c | 4651 | struct mddev *mddev2; |
efeb53c0 N |
4652 | spin_lock(&all_mddevs_lock); |
4653 | ||
4654 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4655 | if (mddev2->gendisk && | |
4656 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4657 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4658 | goto abort; |
efeb53c0 N |
4659 | } |
4660 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4661 | } |
8b765398 | 4662 | |
0909dc44 | 4663 | error = -ENOMEM; |
8b765398 | 4664 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4665 | if (!mddev->queue) |
4666 | goto abort; | |
409c57f3 N |
4667 | mddev->queue->queuedata = mddev; |
4668 | ||
409c57f3 | 4669 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4670 | |
1da177e4 LT |
4671 | disk = alloc_disk(1 << shift); |
4672 | if (!disk) { | |
8b765398 N |
4673 | blk_cleanup_queue(mddev->queue); |
4674 | mddev->queue = NULL; | |
0909dc44 | 4675 | goto abort; |
1da177e4 | 4676 | } |
efeb53c0 | 4677 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4678 | disk->first_minor = unit << shift; |
efeb53c0 N |
4679 | if (name) |
4680 | strcpy(disk->disk_name, name); | |
4681 | else if (partitioned) | |
1da177e4 | 4682 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4683 | else |
1da177e4 | 4684 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4685 | disk->fops = &md_fops; |
4686 | disk->private_data = mddev; | |
4687 | disk->queue = mddev->queue; | |
b0140891 | 4688 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4689 | /* Allow extended partitions. This makes the |
d3374825 | 4690 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4691 | * remove it now. |
4692 | */ | |
4693 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4694 | mddev->gendisk = disk; |
b0140891 N |
4695 | /* As soon as we call add_disk(), another thread could get |
4696 | * through to md_open, so make sure it doesn't get too far | |
4697 | */ | |
4698 | mutex_lock(&mddev->open_mutex); | |
4699 | add_disk(disk); | |
4700 | ||
ed9e1982 TH |
4701 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4702 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4703 | if (error) { |
4704 | /* This isn't possible, but as kobject_init_and_add is marked | |
4705 | * __must_check, we must do something with the result | |
4706 | */ | |
5e55e2f5 N |
4707 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4708 | disk->disk_name); | |
0909dc44 N |
4709 | error = 0; |
4710 | } | |
00bcb4ac N |
4711 | if (mddev->kobj.sd && |
4712 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4713 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4714 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4715 | abort: |
4716 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4717 | if (!error && mddev->kobj.sd) { |
3830c62f | 4718 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4719 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4720 | } |
d3374825 | 4721 | mddev_put(mddev); |
0909dc44 | 4722 | return error; |
efeb53c0 N |
4723 | } |
4724 | ||
4725 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4726 | { | |
4727 | md_alloc(dev, NULL); | |
1da177e4 LT |
4728 | return NULL; |
4729 | } | |
4730 | ||
efeb53c0 N |
4731 | static int add_named_array(const char *val, struct kernel_param *kp) |
4732 | { | |
4733 | /* val must be "md_*" where * is not all digits. | |
4734 | * We allocate an array with a large free minor number, and | |
4735 | * set the name to val. val must not already be an active name. | |
4736 | */ | |
4737 | int len = strlen(val); | |
4738 | char buf[DISK_NAME_LEN]; | |
4739 | ||
4740 | while (len && val[len-1] == '\n') | |
4741 | len--; | |
4742 | if (len >= DISK_NAME_LEN) | |
4743 | return -E2BIG; | |
4744 | strlcpy(buf, val, len+1); | |
4745 | if (strncmp(buf, "md_", 3) != 0) | |
4746 | return -EINVAL; | |
4747 | return md_alloc(0, buf); | |
4748 | } | |
4749 | ||
1da177e4 LT |
4750 | static void md_safemode_timeout(unsigned long data) |
4751 | { | |
fd01b88c | 4752 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 4753 | |
0fd62b86 NB |
4754 | if (!atomic_read(&mddev->writes_pending)) { |
4755 | mddev->safemode = 1; | |
4756 | if (mddev->external) | |
00bcb4ac | 4757 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4758 | } |
1da177e4 LT |
4759 | md_wakeup_thread(mddev->thread); |
4760 | } | |
4761 | ||
6ff8d8ec | 4762 | static int start_dirty_degraded; |
1da177e4 | 4763 | |
fd01b88c | 4764 | int md_run(struct mddev *mddev) |
1da177e4 | 4765 | { |
2604b703 | 4766 | int err; |
3cb03002 | 4767 | struct md_rdev *rdev; |
84fc4b56 | 4768 | struct md_personality *pers; |
1da177e4 | 4769 | |
a757e64c N |
4770 | if (list_empty(&mddev->disks)) |
4771 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4772 | return -EINVAL; |
1da177e4 LT |
4773 | |
4774 | if (mddev->pers) | |
4775 | return -EBUSY; | |
bb4f1e9d N |
4776 | /* Cannot run until previous stop completes properly */ |
4777 | if (mddev->sysfs_active) | |
4778 | return -EBUSY; | |
b6eb127d | 4779 | |
1da177e4 LT |
4780 | /* |
4781 | * Analyze all RAID superblock(s) | |
4782 | */ | |
1ec4a939 N |
4783 | if (!mddev->raid_disks) { |
4784 | if (!mddev->persistent) | |
4785 | return -EINVAL; | |
a757e64c | 4786 | analyze_sbs(mddev); |
1ec4a939 | 4787 | } |
1da177e4 | 4788 | |
d9d166c2 N |
4789 | if (mddev->level != LEVEL_NONE) |
4790 | request_module("md-level-%d", mddev->level); | |
4791 | else if (mddev->clevel[0]) | |
4792 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4793 | |
4794 | /* | |
4795 | * Drop all container device buffers, from now on | |
4796 | * the only valid external interface is through the md | |
4797 | * device. | |
1da177e4 | 4798 | */ |
159ec1fc | 4799 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4800 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4801 | continue; |
4802 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4803 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4804 | |
4805 | /* perform some consistency tests on the device. | |
4806 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4807 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4808 | */ |
a6ff7e08 JB |
4809 | if (rdev->meta_bdev) { |
4810 | /* Nothing to check */; | |
4811 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4812 | if (mddev->dev_sectors && |
4813 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4814 | > rdev->sb_start) { |
f0d76d70 N |
4815 | printk("md: %s: data overlaps metadata\n", |
4816 | mdname(mddev)); | |
4817 | return -EINVAL; | |
4818 | } | |
4819 | } else { | |
0f420358 | 4820 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4821 | > rdev->data_offset) { |
4822 | printk("md: %s: metadata overlaps data\n", | |
4823 | mdname(mddev)); | |
4824 | return -EINVAL; | |
4825 | } | |
4826 | } | |
00bcb4ac | 4827 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4828 | } |
4829 | ||
a167f663 | 4830 | if (mddev->bio_set == NULL) |
a519b26d | 4831 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, |
fd01b88c | 4832 | sizeof(struct mddev *)); |
a167f663 | 4833 | |
1da177e4 | 4834 | spin_lock(&pers_lock); |
d9d166c2 | 4835 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4836 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4837 | spin_unlock(&pers_lock); |
d9d166c2 N |
4838 | if (mddev->level != LEVEL_NONE) |
4839 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4840 | mddev->level); | |
4841 | else | |
4842 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4843 | mddev->clevel); | |
1da177e4 LT |
4844 | return -EINVAL; |
4845 | } | |
2604b703 | 4846 | mddev->pers = pers; |
1da177e4 | 4847 | spin_unlock(&pers_lock); |
34817e8c N |
4848 | if (mddev->level != pers->level) { |
4849 | mddev->level = pers->level; | |
4850 | mddev->new_level = pers->level; | |
4851 | } | |
d9d166c2 | 4852 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4853 | |
f6705578 | 4854 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4855 | pers->start_reshape == NULL) { |
f6705578 N |
4856 | /* This personality cannot handle reshaping... */ |
4857 | mddev->pers = NULL; | |
4858 | module_put(pers->owner); | |
4859 | return -EINVAL; | |
4860 | } | |
4861 | ||
7dd5e7c3 N |
4862 | if (pers->sync_request) { |
4863 | /* Warn if this is a potentially silly | |
4864 | * configuration. | |
4865 | */ | |
4866 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 4867 | struct md_rdev *rdev2; |
7dd5e7c3 | 4868 | int warned = 0; |
159ec1fc CR |
4869 | |
4870 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4871 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4872 | if (rdev < rdev2 && |
4873 | rdev->bdev->bd_contains == | |
4874 | rdev2->bdev->bd_contains) { | |
4875 | printk(KERN_WARNING | |
4876 | "%s: WARNING: %s appears to be" | |
4877 | " on the same physical disk as" | |
4878 | " %s.\n", | |
4879 | mdname(mddev), | |
4880 | bdevname(rdev->bdev,b), | |
4881 | bdevname(rdev2->bdev,b2)); | |
4882 | warned = 1; | |
4883 | } | |
4884 | } | |
159ec1fc | 4885 | |
7dd5e7c3 N |
4886 | if (warned) |
4887 | printk(KERN_WARNING | |
4888 | "True protection against single-disk" | |
4889 | " failure might be compromised.\n"); | |
4890 | } | |
4891 | ||
657390d2 | 4892 | mddev->recovery = 0; |
58c0fed4 AN |
4893 | /* may be over-ridden by personality */ |
4894 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4895 | ||
6ff8d8ec | 4896 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4897 | |
0f9552b5 | 4898 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4899 | mddev->ro = 2; /* read-only, but switch on first write */ |
4900 | ||
b15c2e57 | 4901 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4902 | if (err) |
4903 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4904 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4905 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4906 | " but 'external_size' not in effect?\n", __func__); | |
4907 | printk(KERN_ERR | |
4908 | "md: invalid array_size %llu > default size %llu\n", | |
4909 | (unsigned long long)mddev->array_sectors / 2, | |
4910 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4911 | err = -EINVAL; | |
4912 | mddev->pers->stop(mddev); | |
4913 | } | |
4914 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4915 | err = bitmap_create(mddev); |
4916 | if (err) { | |
4917 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4918 | mdname(mddev), err); | |
4919 | mddev->pers->stop(mddev); | |
4920 | } | |
4921 | } | |
1da177e4 | 4922 | if (err) { |
1da177e4 LT |
4923 | module_put(mddev->pers->owner); |
4924 | mddev->pers = NULL; | |
32a7627c N |
4925 | bitmap_destroy(mddev); |
4926 | return err; | |
1da177e4 | 4927 | } |
5e55e2f5 | 4928 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4929 | if (mddev->kobj.sd && |
4930 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4931 | printk(KERN_WARNING |
4932 | "md: cannot register extra attributes for %s\n", | |
4933 | mdname(mddev)); | |
00bcb4ac | 4934 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4935 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4936 | mddev->ro = 0; |
4937 | ||
1da177e4 | 4938 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4939 | atomic_set(&mddev->max_corr_read_errors, |
4940 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4941 | mddev->safemode = 0; |
4942 | mddev->safemode_timer.function = md_safemode_timeout; | |
4943 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4944 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4945 | mddev->in_sync = 1; |
0ca69886 N |
4946 | smp_wmb(); |
4947 | mddev->ready = 1; | |
159ec1fc | 4948 | list_for_each_entry(rdev, &mddev->disks, same_set) |
36fad858 NK |
4949 | if (rdev->raid_disk >= 0) |
4950 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 4951 | /* failure here is OK */; |
1da177e4 LT |
4952 | |
4953 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4954 | ||
850b2b42 N |
4955 | if (mddev->flags) |
4956 | md_update_sb(mddev, 0); | |
1da177e4 | 4957 | |
d7603b7e | 4958 | md_new_event(mddev); |
00bcb4ac N |
4959 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4960 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4961 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4962 | return 0; |
4963 | } | |
390ee602 | 4964 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4965 | |
fd01b88c | 4966 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
4967 | { |
4968 | int err; | |
4969 | ||
4970 | err = md_run(mddev); | |
4971 | if (err) | |
4972 | goto out; | |
69e51b44 N |
4973 | err = bitmap_load(mddev); |
4974 | if (err) { | |
4975 | bitmap_destroy(mddev); | |
4976 | goto out; | |
4977 | } | |
0fd018af JB |
4978 | |
4979 | md_wakeup_thread(mddev->thread); | |
4980 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
4981 | ||
fe60b014 N |
4982 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4983 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 4984 | mddev->changed = 1; |
fe60b014 N |
4985 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
4986 | out: | |
4987 | return err; | |
4988 | } | |
4989 | ||
fd01b88c | 4990 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
4991 | { |
4992 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4993 | |
80fab1d7 | 4994 | /* Complain if it has no devices */ |
1da177e4 | 4995 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4996 | return -ENXIO; |
4997 | if (!mddev->pers) | |
4998 | return -EINVAL; | |
4999 | if (!mddev->ro) | |
5000 | return -EBUSY; | |
5001 | mddev->safemode = 0; | |
5002 | mddev->ro = 0; | |
5003 | set_disk_ro(disk, 0); | |
5004 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
5005 | mdname(mddev)); | |
5006 | /* Kick recovery or resync if necessary */ | |
5007 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5008 | md_wakeup_thread(mddev->thread); | |
5009 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 5010 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 5011 | return 0; |
1da177e4 LT |
5012 | } |
5013 | ||
acc55e22 N |
5014 | /* similar to deny_write_access, but accounts for our holding a reference |
5015 | * to the file ourselves */ | |
5016 | static int deny_bitmap_write_access(struct file * file) | |
5017 | { | |
5018 | struct inode *inode = file->f_mapping->host; | |
5019 | ||
5020 | spin_lock(&inode->i_lock); | |
5021 | if (atomic_read(&inode->i_writecount) > 1) { | |
5022 | spin_unlock(&inode->i_lock); | |
5023 | return -ETXTBSY; | |
5024 | } | |
5025 | atomic_set(&inode->i_writecount, -1); | |
5026 | spin_unlock(&inode->i_lock); | |
5027 | ||
5028 | return 0; | |
5029 | } | |
5030 | ||
43a70507 | 5031 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
5032 | { |
5033 | struct inode *inode = file->f_mapping->host; | |
5034 | ||
5035 | spin_lock(&inode->i_lock); | |
5036 | atomic_set(&inode->i_writecount, 1); | |
5037 | spin_unlock(&inode->i_lock); | |
5038 | } | |
5039 | ||
fd01b88c | 5040 | static void md_clean(struct mddev *mddev) |
6177b472 N |
5041 | { |
5042 | mddev->array_sectors = 0; | |
5043 | mddev->external_size = 0; | |
5044 | mddev->dev_sectors = 0; | |
5045 | mddev->raid_disks = 0; | |
5046 | mddev->recovery_cp = 0; | |
5047 | mddev->resync_min = 0; | |
5048 | mddev->resync_max = MaxSector; | |
5049 | mddev->reshape_position = MaxSector; | |
5050 | mddev->external = 0; | |
5051 | mddev->persistent = 0; | |
5052 | mddev->level = LEVEL_NONE; | |
5053 | mddev->clevel[0] = 0; | |
5054 | mddev->flags = 0; | |
5055 | mddev->ro = 0; | |
5056 | mddev->metadata_type[0] = 0; | |
5057 | mddev->chunk_sectors = 0; | |
5058 | mddev->ctime = mddev->utime = 0; | |
5059 | mddev->layout = 0; | |
5060 | mddev->max_disks = 0; | |
5061 | mddev->events = 0; | |
a8707c08 | 5062 | mddev->can_decrease_events = 0; |
6177b472 N |
5063 | mddev->delta_disks = 0; |
5064 | mddev->new_level = LEVEL_NONE; | |
5065 | mddev->new_layout = 0; | |
5066 | mddev->new_chunk_sectors = 0; | |
5067 | mddev->curr_resync = 0; | |
5068 | mddev->resync_mismatches = 0; | |
5069 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
5070 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5071 | mddev->recovery = 0; | |
5072 | mddev->in_sync = 0; | |
f0b4f7e2 | 5073 | mddev->changed = 0; |
6177b472 | 5074 | mddev->degraded = 0; |
6177b472 N |
5075 | mddev->safemode = 0; |
5076 | mddev->bitmap_info.offset = 0; | |
5077 | mddev->bitmap_info.default_offset = 0; | |
5078 | mddev->bitmap_info.chunksize = 0; | |
5079 | mddev->bitmap_info.daemon_sleep = 0; | |
5080 | mddev->bitmap_info.max_write_behind = 0; | |
5081 | } | |
5082 | ||
fd01b88c | 5083 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 N |
5084 | { |
5085 | if (mddev->sync_thread) { | |
5086 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5087 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 5088 | reap_sync_thread(mddev); |
a047e125 N |
5089 | } |
5090 | ||
5091 | del_timer_sync(&mddev->safemode_timer); | |
5092 | ||
5093 | bitmap_flush(mddev); | |
5094 | md_super_wait(mddev); | |
5095 | ||
5096 | if (!mddev->in_sync || mddev->flags) { | |
5097 | /* mark array as shutdown cleanly */ | |
5098 | mddev->in_sync = 1; | |
5099 | md_update_sb(mddev, 1); | |
5100 | } | |
5101 | } | |
defad61a | 5102 | |
fd01b88c | 5103 | void md_stop_writes(struct mddev *mddev) |
defad61a N |
5104 | { |
5105 | mddev_lock(mddev); | |
5106 | __md_stop_writes(mddev); | |
5107 | mddev_unlock(mddev); | |
5108 | } | |
390ee602 | 5109 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5110 | |
fd01b88c | 5111 | void md_stop(struct mddev *mddev) |
6177b472 | 5112 | { |
0ca69886 | 5113 | mddev->ready = 0; |
6177b472 N |
5114 | mddev->pers->stop(mddev); |
5115 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
5116 | mddev->to_remove = &md_redundancy_group; | |
5117 | module_put(mddev->pers->owner); | |
5118 | mddev->pers = NULL; | |
cca9cf90 | 5119 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5120 | } |
390ee602 | 5121 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5122 | |
fd01b88c | 5123 | static int md_set_readonly(struct mddev *mddev, int is_open) |
a4bd82d0 N |
5124 | { |
5125 | int err = 0; | |
5126 | mutex_lock(&mddev->open_mutex); | |
5127 | if (atomic_read(&mddev->openers) > is_open) { | |
5128 | printk("md: %s still in use.\n",mdname(mddev)); | |
5129 | err = -EBUSY; | |
5130 | goto out; | |
5131 | } | |
5132 | if (mddev->pers) { | |
defad61a | 5133 | __md_stop_writes(mddev); |
a4bd82d0 N |
5134 | |
5135 | err = -ENXIO; | |
5136 | if (mddev->ro==1) | |
5137 | goto out; | |
5138 | mddev->ro = 1; | |
5139 | set_disk_ro(mddev->gendisk, 1); | |
5140 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 5141 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
5142 | err = 0; |
5143 | } | |
5144 | out: | |
5145 | mutex_unlock(&mddev->open_mutex); | |
5146 | return err; | |
5147 | } | |
5148 | ||
9e653b63 N |
5149 | /* mode: |
5150 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5151 | * 2 - stop but do not disassemble array |
5152 | */ | |
fd01b88c | 5153 | static int do_md_stop(struct mddev * mddev, int mode, int is_open) |
1da177e4 | 5154 | { |
1da177e4 | 5155 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5156 | struct md_rdev *rdev; |
1da177e4 | 5157 | |
c8c00a69 | 5158 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
5159 | if (atomic_read(&mddev->openers) > is_open || |
5160 | mddev->sysfs_active) { | |
df5b20cf | 5161 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
5162 | mutex_unlock(&mddev->open_mutex); |
5163 | return -EBUSY; | |
5164 | } | |
1da177e4 | 5165 | |
6e17b027 | 5166 | if (mddev->pers) { |
a4bd82d0 N |
5167 | if (mddev->ro) |
5168 | set_disk_ro(disk, 0); | |
409c57f3 | 5169 | |
defad61a | 5170 | __md_stop_writes(mddev); |
a4bd82d0 N |
5171 | md_stop(mddev); |
5172 | mddev->queue->merge_bvec_fn = NULL; | |
a4bd82d0 | 5173 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5174 | |
a4bd82d0 | 5175 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5176 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5177 | |
a4bd82d0 | 5178 | list_for_each_entry(rdev, &mddev->disks, same_set) |
36fad858 NK |
5179 | if (rdev->raid_disk >= 0) |
5180 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5181 | |
a4bd82d0 | 5182 | set_capacity(disk, 0); |
6e17b027 | 5183 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5184 | mddev->changed = 1; |
a4bd82d0 | 5185 | revalidate_disk(disk); |
0d4ca600 | 5186 | |
a4bd82d0 N |
5187 | if (mddev->ro) |
5188 | mddev->ro = 0; | |
6e17b027 N |
5189 | } else |
5190 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5191 | /* |
5192 | * Free resources if final stop | |
5193 | */ | |
9e653b63 | 5194 | if (mode == 0) { |
1da177e4 LT |
5195 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5196 | ||
978f946b | 5197 | bitmap_destroy(mddev); |
c3d9714e N |
5198 | if (mddev->bitmap_info.file) { |
5199 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5200 | fput(mddev->bitmap_info.file); | |
5201 | mddev->bitmap_info.file = NULL; | |
978f946b | 5202 | } |
c3d9714e | 5203 | mddev->bitmap_info.offset = 0; |
978f946b | 5204 | |
1da177e4 LT |
5205 | export_array(mddev); |
5206 | ||
6177b472 | 5207 | md_clean(mddev); |
934d9c23 | 5208 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5209 | if (mddev->hold_active == UNTIL_STOP) |
5210 | mddev->hold_active = 0; | |
a4bd82d0 | 5211 | } |
3f9d99c1 | 5212 | blk_integrity_unregister(disk); |
d7603b7e | 5213 | md_new_event(mddev); |
00bcb4ac | 5214 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5215 | return 0; |
1da177e4 LT |
5216 | } |
5217 | ||
fdee8ae4 | 5218 | #ifndef MODULE |
fd01b88c | 5219 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5220 | { |
3cb03002 | 5221 | struct md_rdev *rdev; |
1da177e4 LT |
5222 | int err; |
5223 | ||
a757e64c | 5224 | if (list_empty(&mddev->disks)) |
1da177e4 | 5225 | return; |
1da177e4 LT |
5226 | |
5227 | printk(KERN_INFO "md: running: "); | |
5228 | ||
159ec1fc | 5229 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5230 | char b[BDEVNAME_SIZE]; |
5231 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5232 | } | |
5233 | printk("\n"); | |
5234 | ||
d710e138 | 5235 | err = do_md_run(mddev); |
1da177e4 LT |
5236 | if (err) { |
5237 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 5238 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
5239 | } |
5240 | } | |
5241 | ||
5242 | /* | |
5243 | * lets try to run arrays based on all disks that have arrived | |
5244 | * until now. (those are in pending_raid_disks) | |
5245 | * | |
5246 | * the method: pick the first pending disk, collect all disks with | |
5247 | * the same UUID, remove all from the pending list and put them into | |
5248 | * the 'same_array' list. Then order this list based on superblock | |
5249 | * update time (freshest comes first), kick out 'old' disks and | |
5250 | * compare superblocks. If everything's fine then run it. | |
5251 | * | |
5252 | * If "unit" is allocated, then bump its reference count | |
5253 | */ | |
5254 | static void autorun_devices(int part) | |
5255 | { | |
3cb03002 | 5256 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5257 | struct mddev *mddev; |
1da177e4 LT |
5258 | char b[BDEVNAME_SIZE]; |
5259 | ||
5260 | printk(KERN_INFO "md: autorun ...\n"); | |
5261 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5262 | int unit; |
1da177e4 | 5263 | dev_t dev; |
ad01c9e3 | 5264 | LIST_HEAD(candidates); |
1da177e4 | 5265 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5266 | struct md_rdev, same_set); |
1da177e4 LT |
5267 | |
5268 | printk(KERN_INFO "md: considering %s ...\n", | |
5269 | bdevname(rdev0->bdev,b)); | |
5270 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5271 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5272 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5273 | printk(KERN_INFO "md: adding %s ...\n", | |
5274 | bdevname(rdev->bdev,b)); | |
5275 | list_move(&rdev->same_set, &candidates); | |
5276 | } | |
5277 | /* | |
5278 | * now we have a set of devices, with all of them having | |
5279 | * mostly sane superblocks. It's time to allocate the | |
5280 | * mddev. | |
5281 | */ | |
e8703fe1 N |
5282 | if (part) { |
5283 | dev = MKDEV(mdp_major, | |
5284 | rdev0->preferred_minor << MdpMinorShift); | |
5285 | unit = MINOR(dev) >> MdpMinorShift; | |
5286 | } else { | |
5287 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5288 | unit = MINOR(dev); | |
5289 | } | |
5290 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5291 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5292 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5293 | break; | |
5294 | } | |
1da177e4 LT |
5295 | |
5296 | md_probe(dev, NULL, NULL); | |
5297 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5298 | if (!mddev || !mddev->gendisk) { |
5299 | if (mddev) | |
5300 | mddev_put(mddev); | |
5301 | printk(KERN_ERR | |
1da177e4 LT |
5302 | "md: cannot allocate memory for md drive.\n"); |
5303 | break; | |
5304 | } | |
5305 | if (mddev_lock(mddev)) | |
5306 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
5307 | mdname(mddev)); | |
5308 | else if (mddev->raid_disks || mddev->major_version | |
5309 | || !list_empty(&mddev->disks)) { | |
5310 | printk(KERN_WARNING | |
5311 | "md: %s already running, cannot run %s\n", | |
5312 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5313 | mddev_unlock(mddev); | |
5314 | } else { | |
5315 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5316 | mddev->persistent = 1; |
159ec1fc | 5317 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5318 | list_del_init(&rdev->same_set); |
5319 | if (bind_rdev_to_array(rdev, mddev)) | |
5320 | export_rdev(rdev); | |
5321 | } | |
5322 | autorun_array(mddev); | |
5323 | mddev_unlock(mddev); | |
5324 | } | |
5325 | /* on success, candidates will be empty, on error | |
5326 | * it won't... | |
5327 | */ | |
159ec1fc | 5328 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5329 | list_del_init(&rdev->same_set); |
1da177e4 | 5330 | export_rdev(rdev); |
4b80991c | 5331 | } |
1da177e4 LT |
5332 | mddev_put(mddev); |
5333 | } | |
5334 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5335 | } | |
fdee8ae4 | 5336 | #endif /* !MODULE */ |
1da177e4 | 5337 | |
1da177e4 LT |
5338 | static int get_version(void __user * arg) |
5339 | { | |
5340 | mdu_version_t ver; | |
5341 | ||
5342 | ver.major = MD_MAJOR_VERSION; | |
5343 | ver.minor = MD_MINOR_VERSION; | |
5344 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5345 | ||
5346 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5347 | return -EFAULT; | |
5348 | ||
5349 | return 0; | |
5350 | } | |
5351 | ||
fd01b88c | 5352 | static int get_array_info(struct mddev * mddev, void __user * arg) |
1da177e4 LT |
5353 | { |
5354 | mdu_array_info_t info; | |
a9f326eb | 5355 | int nr,working,insync,failed,spare; |
3cb03002 | 5356 | struct md_rdev *rdev; |
1da177e4 | 5357 | |
a9f326eb | 5358 | nr=working=insync=failed=spare=0; |
159ec1fc | 5359 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 5360 | nr++; |
b2d444d7 | 5361 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5362 | failed++; |
5363 | else { | |
5364 | working++; | |
b2d444d7 | 5365 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 5366 | insync++; |
1da177e4 LT |
5367 | else |
5368 | spare++; | |
5369 | } | |
5370 | } | |
5371 | ||
5372 | info.major_version = mddev->major_version; | |
5373 | info.minor_version = mddev->minor_version; | |
5374 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5375 | info.ctime = mddev->ctime; | |
5376 | info.level = mddev->level; | |
58c0fed4 AN |
5377 | info.size = mddev->dev_sectors / 2; |
5378 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5379 | info.size = -1; |
1da177e4 LT |
5380 | info.nr_disks = nr; |
5381 | info.raid_disks = mddev->raid_disks; | |
5382 | info.md_minor = mddev->md_minor; | |
5383 | info.not_persistent= !mddev->persistent; | |
5384 | ||
5385 | info.utime = mddev->utime; | |
5386 | info.state = 0; | |
5387 | if (mddev->in_sync) | |
5388 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5389 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5390 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5391 | info.active_disks = insync; |
1da177e4 LT |
5392 | info.working_disks = working; |
5393 | info.failed_disks = failed; | |
5394 | info.spare_disks = spare; | |
5395 | ||
5396 | info.layout = mddev->layout; | |
9d8f0363 | 5397 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5398 | |
5399 | if (copy_to_user(arg, &info, sizeof(info))) | |
5400 | return -EFAULT; | |
5401 | ||
5402 | return 0; | |
5403 | } | |
5404 | ||
fd01b88c | 5405 | static int get_bitmap_file(struct mddev * mddev, void __user * arg) |
32a7627c N |
5406 | { |
5407 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5408 | char *ptr, *buf = NULL; | |
5409 | int err = -ENOMEM; | |
5410 | ||
b5470dc5 DW |
5411 | if (md_allow_write(mddev)) |
5412 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5413 | else | |
5414 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5415 | |
32a7627c N |
5416 | if (!file) |
5417 | goto out; | |
5418 | ||
5419 | /* bitmap disabled, zero the first byte and copy out */ | |
5420 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
5421 | file->pathname[0] = '\0'; | |
5422 | goto copy_out; | |
5423 | } | |
5424 | ||
5425 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5426 | if (!buf) | |
5427 | goto out; | |
5428 | ||
6bcfd601 CH |
5429 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
5430 | if (IS_ERR(ptr)) | |
32a7627c N |
5431 | goto out; |
5432 | ||
5433 | strcpy(file->pathname, ptr); | |
5434 | ||
5435 | copy_out: | |
5436 | err = 0; | |
5437 | if (copy_to_user(arg, file, sizeof(*file))) | |
5438 | err = -EFAULT; | |
5439 | out: | |
5440 | kfree(buf); | |
5441 | kfree(file); | |
5442 | return err; | |
5443 | } | |
5444 | ||
fd01b88c | 5445 | static int get_disk_info(struct mddev * mddev, void __user * arg) |
1da177e4 LT |
5446 | { |
5447 | mdu_disk_info_t info; | |
3cb03002 | 5448 | struct md_rdev *rdev; |
1da177e4 LT |
5449 | |
5450 | if (copy_from_user(&info, arg, sizeof(info))) | |
5451 | return -EFAULT; | |
5452 | ||
26ef379f | 5453 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5454 | if (rdev) { |
5455 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5456 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5457 | info.raid_disk = rdev->raid_disk; | |
5458 | info.state = 0; | |
b2d444d7 | 5459 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5460 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5461 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5462 | info.state |= (1<<MD_DISK_ACTIVE); |
5463 | info.state |= (1<<MD_DISK_SYNC); | |
5464 | } | |
8ddf9efe N |
5465 | if (test_bit(WriteMostly, &rdev->flags)) |
5466 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5467 | } else { |
5468 | info.major = info.minor = 0; | |
5469 | info.raid_disk = -1; | |
5470 | info.state = (1<<MD_DISK_REMOVED); | |
5471 | } | |
5472 | ||
5473 | if (copy_to_user(arg, &info, sizeof(info))) | |
5474 | return -EFAULT; | |
5475 | ||
5476 | return 0; | |
5477 | } | |
5478 | ||
fd01b88c | 5479 | static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5480 | { |
5481 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5482 | struct md_rdev *rdev; |
1da177e4 LT |
5483 | dev_t dev = MKDEV(info->major,info->minor); |
5484 | ||
5485 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5486 | return -EOVERFLOW; | |
5487 | ||
5488 | if (!mddev->raid_disks) { | |
5489 | int err; | |
5490 | /* expecting a device which has a superblock */ | |
5491 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5492 | if (IS_ERR(rdev)) { | |
5493 | printk(KERN_WARNING | |
5494 | "md: md_import_device returned %ld\n", | |
5495 | PTR_ERR(rdev)); | |
5496 | return PTR_ERR(rdev); | |
5497 | } | |
5498 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5499 | struct md_rdev *rdev0 |
5500 | = list_entry(mddev->disks.next, | |
5501 | struct md_rdev, same_set); | |
a9f326eb | 5502 | err = super_types[mddev->major_version] |
1da177e4 LT |
5503 | .load_super(rdev, rdev0, mddev->minor_version); |
5504 | if (err < 0) { | |
5505 | printk(KERN_WARNING | |
5506 | "md: %s has different UUID to %s\n", | |
5507 | bdevname(rdev->bdev,b), | |
5508 | bdevname(rdev0->bdev,b2)); | |
5509 | export_rdev(rdev); | |
5510 | return -EINVAL; | |
5511 | } | |
5512 | } | |
5513 | err = bind_rdev_to_array(rdev, mddev); | |
5514 | if (err) | |
5515 | export_rdev(rdev); | |
5516 | return err; | |
5517 | } | |
5518 | ||
5519 | /* | |
5520 | * add_new_disk can be used once the array is assembled | |
5521 | * to add "hot spares". They must already have a superblock | |
5522 | * written | |
5523 | */ | |
5524 | if (mddev->pers) { | |
5525 | int err; | |
5526 | if (!mddev->pers->hot_add_disk) { | |
5527 | printk(KERN_WARNING | |
5528 | "%s: personality does not support diskops!\n", | |
5529 | mdname(mddev)); | |
5530 | return -EINVAL; | |
5531 | } | |
7b1e35f6 N |
5532 | if (mddev->persistent) |
5533 | rdev = md_import_device(dev, mddev->major_version, | |
5534 | mddev->minor_version); | |
5535 | else | |
5536 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5537 | if (IS_ERR(rdev)) { |
5538 | printk(KERN_WARNING | |
5539 | "md: md_import_device returned %ld\n", | |
5540 | PTR_ERR(rdev)); | |
5541 | return PTR_ERR(rdev); | |
5542 | } | |
1a855a06 | 5543 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5544 | if (!mddev->persistent) { |
5545 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5546 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5547 | rdev->raid_disk = info->raid_disk; |
bf572541 N |
5548 | set_bit(In_sync, &rdev->flags); |
5549 | } else | |
41158c7e N |
5550 | rdev->raid_disk = -1; |
5551 | } else | |
5552 | super_types[mddev->major_version]. | |
5553 | validate_super(mddev, rdev); | |
bedd86b7 N |
5554 | if ((info->state & (1<<MD_DISK_SYNC)) && |
5555 | (!test_bit(In_sync, &rdev->flags) || | |
5556 | rdev->raid_disk != info->raid_disk)) { | |
5557 | /* This was a hot-add request, but events doesn't | |
5558 | * match, so reject it. | |
5559 | */ | |
5560 | export_rdev(rdev); | |
5561 | return -EINVAL; | |
5562 | } | |
5563 | ||
1a855a06 N |
5564 | if (test_bit(In_sync, &rdev->flags)) |
5565 | rdev->saved_raid_disk = rdev->raid_disk; | |
5566 | else | |
5567 | rdev->saved_raid_disk = -1; | |
41158c7e | 5568 | |
b2d444d7 | 5569 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5570 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5571 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5572 | else |
5573 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5574 | |
1da177e4 LT |
5575 | rdev->raid_disk = -1; |
5576 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5577 | if (!err && !mddev->pers->hot_remove_disk) { |
5578 | /* If there is hot_add_disk but no hot_remove_disk | |
5579 | * then added disks for geometry changes, | |
5580 | * and should be added immediately. | |
5581 | */ | |
5582 | super_types[mddev->major_version]. | |
5583 | validate_super(mddev, rdev); | |
5584 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5585 | if (err) | |
5586 | unbind_rdev_from_array(rdev); | |
5587 | } | |
1da177e4 LT |
5588 | if (err) |
5589 | export_rdev(rdev); | |
52664732 | 5590 | else |
00bcb4ac | 5591 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5592 | |
17571284 | 5593 | md_update_sb(mddev, 1); |
72a23c21 NB |
5594 | if (mddev->degraded) |
5595 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5596 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5597 | if (!err) |
5598 | md_new_event(mddev); | |
005eca5e | 5599 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5600 | return err; |
5601 | } | |
5602 | ||
5603 | /* otherwise, add_new_disk is only allowed | |
5604 | * for major_version==0 superblocks | |
5605 | */ | |
5606 | if (mddev->major_version != 0) { | |
5607 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5608 | mdname(mddev)); | |
5609 | return -EINVAL; | |
5610 | } | |
5611 | ||
5612 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5613 | int err; | |
d710e138 | 5614 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5615 | if (IS_ERR(rdev)) { |
5616 | printk(KERN_WARNING | |
5617 | "md: error, md_import_device() returned %ld\n", | |
5618 | PTR_ERR(rdev)); | |
5619 | return PTR_ERR(rdev); | |
5620 | } | |
5621 | rdev->desc_nr = info->number; | |
5622 | if (info->raid_disk < mddev->raid_disks) | |
5623 | rdev->raid_disk = info->raid_disk; | |
5624 | else | |
5625 | rdev->raid_disk = -1; | |
5626 | ||
1da177e4 | 5627 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5628 | if (info->state & (1<<MD_DISK_SYNC)) |
5629 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5630 | |
8ddf9efe N |
5631 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5632 | set_bit(WriteMostly, &rdev->flags); | |
5633 | ||
1da177e4 LT |
5634 | if (!mddev->persistent) { |
5635 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5636 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5637 | } else | |
57b2caa3 | 5638 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5639 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5640 | |
2bf071bf N |
5641 | err = bind_rdev_to_array(rdev, mddev); |
5642 | if (err) { | |
5643 | export_rdev(rdev); | |
5644 | return err; | |
5645 | } | |
1da177e4 LT |
5646 | } |
5647 | ||
5648 | return 0; | |
5649 | } | |
5650 | ||
fd01b88c | 5651 | static int hot_remove_disk(struct mddev * mddev, dev_t dev) |
1da177e4 LT |
5652 | { |
5653 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 5654 | struct md_rdev *rdev; |
1da177e4 | 5655 | |
1da177e4 LT |
5656 | rdev = find_rdev(mddev, dev); |
5657 | if (!rdev) | |
5658 | return -ENXIO; | |
5659 | ||
5660 | if (rdev->raid_disk >= 0) | |
5661 | goto busy; | |
5662 | ||
5663 | kick_rdev_from_array(rdev); | |
850b2b42 | 5664 | md_update_sb(mddev, 1); |
d7603b7e | 5665 | md_new_event(mddev); |
1da177e4 LT |
5666 | |
5667 | return 0; | |
5668 | busy: | |
fdefa4d8 | 5669 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5670 | bdevname(rdev->bdev,b), mdname(mddev)); |
5671 | return -EBUSY; | |
5672 | } | |
5673 | ||
fd01b88c | 5674 | static int hot_add_disk(struct mddev * mddev, dev_t dev) |
1da177e4 LT |
5675 | { |
5676 | char b[BDEVNAME_SIZE]; | |
5677 | int err; | |
3cb03002 | 5678 | struct md_rdev *rdev; |
1da177e4 LT |
5679 | |
5680 | if (!mddev->pers) | |
5681 | return -ENODEV; | |
5682 | ||
5683 | if (mddev->major_version != 0) { | |
5684 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5685 | " version-0 superblocks.\n", | |
5686 | mdname(mddev)); | |
5687 | return -EINVAL; | |
5688 | } | |
5689 | if (!mddev->pers->hot_add_disk) { | |
5690 | printk(KERN_WARNING | |
5691 | "%s: personality does not support diskops!\n", | |
5692 | mdname(mddev)); | |
5693 | return -EINVAL; | |
5694 | } | |
5695 | ||
d710e138 | 5696 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5697 | if (IS_ERR(rdev)) { |
5698 | printk(KERN_WARNING | |
5699 | "md: error, md_import_device() returned %ld\n", | |
5700 | PTR_ERR(rdev)); | |
5701 | return -EINVAL; | |
5702 | } | |
5703 | ||
5704 | if (mddev->persistent) | |
57b2caa3 | 5705 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5706 | else |
77304d2a | 5707 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5708 | |
8190e754 | 5709 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5710 | |
b2d444d7 | 5711 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5712 | printk(KERN_WARNING |
5713 | "md: can not hot-add faulty %s disk to %s!\n", | |
5714 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5715 | err = -EINVAL; | |
5716 | goto abort_export; | |
5717 | } | |
b2d444d7 | 5718 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5719 | rdev->desc_nr = -1; |
5842730d | 5720 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5721 | err = bind_rdev_to_array(rdev, mddev); |
5722 | if (err) | |
5723 | goto abort_export; | |
1da177e4 LT |
5724 | |
5725 | /* | |
5726 | * The rest should better be atomic, we can have disk failures | |
5727 | * noticed in interrupt contexts ... | |
5728 | */ | |
5729 | ||
1da177e4 LT |
5730 | rdev->raid_disk = -1; |
5731 | ||
850b2b42 | 5732 | md_update_sb(mddev, 1); |
1da177e4 LT |
5733 | |
5734 | /* | |
5735 | * Kick recovery, maybe this spare has to be added to the | |
5736 | * array immediately. | |
5737 | */ | |
5738 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5739 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5740 | md_new_event(mddev); |
1da177e4 LT |
5741 | return 0; |
5742 | ||
1da177e4 LT |
5743 | abort_export: |
5744 | export_rdev(rdev); | |
5745 | return err; | |
5746 | } | |
5747 | ||
fd01b88c | 5748 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c N |
5749 | { |
5750 | int err; | |
5751 | ||
36fa3063 N |
5752 | if (mddev->pers) { |
5753 | if (!mddev->pers->quiesce) | |
5754 | return -EBUSY; | |
5755 | if (mddev->recovery || mddev->sync_thread) | |
5756 | return -EBUSY; | |
5757 | /* we should be able to change the bitmap.. */ | |
5758 | } | |
32a7627c | 5759 | |
32a7627c | 5760 | |
36fa3063 N |
5761 | if (fd >= 0) { |
5762 | if (mddev->bitmap) | |
5763 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5764 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5765 | |
c3d9714e | 5766 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5767 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5768 | mdname(mddev)); | |
5769 | return -EBADF; | |
5770 | } | |
5771 | ||
c3d9714e | 5772 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5773 | if (err) { |
5774 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5775 | mdname(mddev)); | |
c3d9714e N |
5776 | fput(mddev->bitmap_info.file); |
5777 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5778 | return err; |
5779 | } | |
c3d9714e | 5780 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5781 | } else if (mddev->bitmap == NULL) |
5782 | return -ENOENT; /* cannot remove what isn't there */ | |
5783 | err = 0; | |
5784 | if (mddev->pers) { | |
5785 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5786 | if (fd >= 0) { |
36fa3063 | 5787 | err = bitmap_create(mddev); |
69e51b44 N |
5788 | if (!err) |
5789 | err = bitmap_load(mddev); | |
5790 | } | |
d7375ab3 | 5791 | if (fd < 0 || err) { |
36fa3063 | 5792 | bitmap_destroy(mddev); |
d7375ab3 N |
5793 | fd = -1; /* make sure to put the file */ |
5794 | } | |
36fa3063 | 5795 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5796 | } |
5797 | if (fd < 0) { | |
c3d9714e N |
5798 | if (mddev->bitmap_info.file) { |
5799 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5800 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5801 | } |
c3d9714e | 5802 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5803 | } |
5804 | ||
32a7627c N |
5805 | return err; |
5806 | } | |
5807 | ||
1da177e4 LT |
5808 | /* |
5809 | * set_array_info is used two different ways | |
5810 | * The original usage is when creating a new array. | |
5811 | * In this usage, raid_disks is > 0 and it together with | |
5812 | * level, size, not_persistent,layout,chunksize determine the | |
5813 | * shape of the array. | |
5814 | * This will always create an array with a type-0.90.0 superblock. | |
5815 | * The newer usage is when assembling an array. | |
5816 | * In this case raid_disks will be 0, and the major_version field is | |
5817 | * use to determine which style super-blocks are to be found on the devices. | |
5818 | * The minor and patch _version numbers are also kept incase the | |
5819 | * super_block handler wishes to interpret them. | |
5820 | */ | |
fd01b88c | 5821 | static int set_array_info(struct mddev * mddev, mdu_array_info_t *info) |
1da177e4 LT |
5822 | { |
5823 | ||
5824 | if (info->raid_disks == 0) { | |
5825 | /* just setting version number for superblock loading */ | |
5826 | if (info->major_version < 0 || | |
50511da3 | 5827 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5828 | super_types[info->major_version].name == NULL) { |
5829 | /* maybe try to auto-load a module? */ | |
5830 | printk(KERN_INFO | |
5831 | "md: superblock version %d not known\n", | |
5832 | info->major_version); | |
5833 | return -EINVAL; | |
5834 | } | |
5835 | mddev->major_version = info->major_version; | |
5836 | mddev->minor_version = info->minor_version; | |
5837 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5838 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5839 | /* ensure mddev_put doesn't delete this now that there |
5840 | * is some minimal configuration. | |
5841 | */ | |
5842 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5843 | return 0; |
5844 | } | |
5845 | mddev->major_version = MD_MAJOR_VERSION; | |
5846 | mddev->minor_version = MD_MINOR_VERSION; | |
5847 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5848 | mddev->ctime = get_seconds(); | |
5849 | ||
5850 | mddev->level = info->level; | |
17115e03 | 5851 | mddev->clevel[0] = 0; |
58c0fed4 | 5852 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5853 | mddev->raid_disks = info->raid_disks; |
5854 | /* don't set md_minor, it is determined by which /dev/md* was | |
5855 | * openned | |
5856 | */ | |
5857 | if (info->state & (1<<MD_SB_CLEAN)) | |
5858 | mddev->recovery_cp = MaxSector; | |
5859 | else | |
5860 | mddev->recovery_cp = 0; | |
5861 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5862 | mddev->external = 0; |
1da177e4 LT |
5863 | |
5864 | mddev->layout = info->layout; | |
9d8f0363 | 5865 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5866 | |
5867 | mddev->max_disks = MD_SB_DISKS; | |
5868 | ||
e691063a N |
5869 | if (mddev->persistent) |
5870 | mddev->flags = 0; | |
850b2b42 | 5871 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5872 | |
c3d9714e N |
5873 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5874 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5875 | |
f6705578 N |
5876 | mddev->reshape_position = MaxSector; |
5877 | ||
1da177e4 LT |
5878 | /* |
5879 | * Generate a 128 bit UUID | |
5880 | */ | |
5881 | get_random_bytes(mddev->uuid, 16); | |
5882 | ||
f6705578 | 5883 | mddev->new_level = mddev->level; |
664e7c41 | 5884 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5885 | mddev->new_layout = mddev->layout; |
5886 | mddev->delta_disks = 0; | |
5887 | ||
1da177e4 LT |
5888 | return 0; |
5889 | } | |
5890 | ||
fd01b88c | 5891 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 5892 | { |
b522adcd DW |
5893 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5894 | ||
5895 | if (mddev->external_size) | |
5896 | return; | |
5897 | ||
1f403624 DW |
5898 | mddev->array_sectors = array_sectors; |
5899 | } | |
5900 | EXPORT_SYMBOL(md_set_array_sectors); | |
5901 | ||
fd01b88c | 5902 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 5903 | { |
3cb03002 | 5904 | struct md_rdev *rdev; |
a35b0d69 | 5905 | int rv; |
d71f9f88 | 5906 | int fit = (num_sectors == 0); |
a35b0d69 N |
5907 | |
5908 | if (mddev->pers->resize == NULL) | |
5909 | return -EINVAL; | |
d71f9f88 AN |
5910 | /* The "num_sectors" is the number of sectors of each device that |
5911 | * is used. This can only make sense for arrays with redundancy. | |
5912 | * linear and raid0 always use whatever space is available. We can only | |
5913 | * consider changing this number if no resync or reconstruction is | |
5914 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5915 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5916 | * of each device. If num_sectors is zero, we find the largest size |
5917 | * that fits. | |
a35b0d69 N |
5918 | */ |
5919 | if (mddev->sync_thread) | |
5920 | return -EBUSY; | |
dba034ee N |
5921 | if (mddev->bitmap) |
5922 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5923 | * grow, and re-add. | |
5924 | */ | |
5925 | return -EBUSY; | |
159ec1fc | 5926 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5927 | sector_t avail = rdev->sectors; |
01ab5662 | 5928 | |
d71f9f88 AN |
5929 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5930 | num_sectors = avail; | |
5931 | if (avail < num_sectors) | |
a35b0d69 N |
5932 | return -ENOSPC; |
5933 | } | |
d71f9f88 | 5934 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5935 | if (!rv) |
5936 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5937 | return rv; |
5938 | } | |
5939 | ||
fd01b88c | 5940 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
5941 | { |
5942 | int rv; | |
5943 | /* change the number of raid disks */ | |
63c70c4f | 5944 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5945 | return -EINVAL; |
5946 | if (raid_disks <= 0 || | |
233fca36 | 5947 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5948 | return -EINVAL; |
63c70c4f | 5949 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5950 | return -EBUSY; |
63c70c4f N |
5951 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5952 | ||
5953 | rv = mddev->pers->check_reshape(mddev); | |
de171cb9 N |
5954 | if (rv < 0) |
5955 | mddev->delta_disks = 0; | |
da943b99 N |
5956 | return rv; |
5957 | } | |
5958 | ||
5959 | ||
1da177e4 LT |
5960 | /* |
5961 | * update_array_info is used to change the configuration of an | |
5962 | * on-line array. | |
5963 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5964 | * fields in the info are checked against the array. | |
5965 | * Any differences that cannot be handled will cause an error. | |
5966 | * Normally, only one change can be managed at a time. | |
5967 | */ | |
fd01b88c | 5968 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
5969 | { |
5970 | int rv = 0; | |
5971 | int cnt = 0; | |
36fa3063 N |
5972 | int state = 0; |
5973 | ||
5974 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5975 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5976 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5977 | |
5978 | if (mddev->major_version != info->major_version || | |
5979 | mddev->minor_version != info->minor_version || | |
5980 | /* mddev->patch_version != info->patch_version || */ | |
5981 | mddev->ctime != info->ctime || | |
5982 | mddev->level != info->level || | |
5983 | /* mddev->layout != info->layout || */ | |
5984 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5985 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5986 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5987 | ((state^info->state) & 0xfffffe00) | |
5988 | ) | |
1da177e4 LT |
5989 | return -EINVAL; |
5990 | /* Check there is only one change */ | |
58c0fed4 AN |
5991 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5992 | cnt++; | |
5993 | if (mddev->raid_disks != info->raid_disks) | |
5994 | cnt++; | |
5995 | if (mddev->layout != info->layout) | |
5996 | cnt++; | |
5997 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5998 | cnt++; | |
5999 | if (cnt == 0) | |
6000 | return 0; | |
6001 | if (cnt > 1) | |
6002 | return -EINVAL; | |
1da177e4 LT |
6003 | |
6004 | if (mddev->layout != info->layout) { | |
6005 | /* Change layout | |
6006 | * we don't need to do anything at the md level, the | |
6007 | * personality will take care of it all. | |
6008 | */ | |
50ac168a | 6009 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 6010 | return -EINVAL; |
597a711b N |
6011 | else { |
6012 | mddev->new_layout = info->layout; | |
50ac168a | 6013 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
6014 | if (rv) |
6015 | mddev->new_layout = mddev->layout; | |
6016 | return rv; | |
6017 | } | |
1da177e4 | 6018 | } |
58c0fed4 | 6019 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 6020 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 6021 | |
da943b99 N |
6022 | if (mddev->raid_disks != info->raid_disks) |
6023 | rv = update_raid_disks(mddev, info->raid_disks); | |
6024 | ||
36fa3063 N |
6025 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
6026 | if (mddev->pers->quiesce == NULL) | |
6027 | return -EINVAL; | |
6028 | if (mddev->recovery || mddev->sync_thread) | |
6029 | return -EBUSY; | |
6030 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
6031 | /* add the bitmap */ | |
6032 | if (mddev->bitmap) | |
6033 | return -EEXIST; | |
c3d9714e | 6034 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 6035 | return -EINVAL; |
c3d9714e N |
6036 | mddev->bitmap_info.offset = |
6037 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
6038 | mddev->pers->quiesce(mddev, 1); |
6039 | rv = bitmap_create(mddev); | |
69e51b44 N |
6040 | if (!rv) |
6041 | rv = bitmap_load(mddev); | |
36fa3063 N |
6042 | if (rv) |
6043 | bitmap_destroy(mddev); | |
6044 | mddev->pers->quiesce(mddev, 0); | |
6045 | } else { | |
6046 | /* remove the bitmap */ | |
6047 | if (!mddev->bitmap) | |
6048 | return -ENOENT; | |
6049 | if (mddev->bitmap->file) | |
6050 | return -EINVAL; | |
6051 | mddev->pers->quiesce(mddev, 1); | |
6052 | bitmap_destroy(mddev); | |
6053 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 6054 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
6055 | } |
6056 | } | |
850b2b42 | 6057 | md_update_sb(mddev, 1); |
1da177e4 LT |
6058 | return rv; |
6059 | } | |
6060 | ||
fd01b88c | 6061 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6062 | { |
3cb03002 | 6063 | struct md_rdev *rdev; |
1da177e4 LT |
6064 | |
6065 | if (mddev->pers == NULL) | |
6066 | return -ENODEV; | |
6067 | ||
6068 | rdev = find_rdev(mddev, dev); | |
6069 | if (!rdev) | |
6070 | return -ENODEV; | |
6071 | ||
6072 | md_error(mddev, rdev); | |
5ef56c8f N |
6073 | if (!test_bit(Faulty, &rdev->flags)) |
6074 | return -EBUSY; | |
1da177e4 LT |
6075 | return 0; |
6076 | } | |
6077 | ||
2f9618ce AN |
6078 | /* |
6079 | * We have a problem here : there is no easy way to give a CHS | |
6080 | * virtual geometry. We currently pretend that we have a 2 heads | |
6081 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6082 | * dosfs just mad... ;-) | |
6083 | */ | |
a885c8c4 CH |
6084 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6085 | { | |
fd01b88c | 6086 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6087 | |
6088 | geo->heads = 2; | |
6089 | geo->sectors = 4; | |
49ce6cea | 6090 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6091 | return 0; |
6092 | } | |
6093 | ||
a39907fa | 6094 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6095 | unsigned int cmd, unsigned long arg) |
6096 | { | |
6097 | int err = 0; | |
6098 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6099 | struct mddev *mddev = NULL; |
e2218350 | 6100 | int ro; |
1da177e4 | 6101 | |
506c9e44 N |
6102 | switch (cmd) { |
6103 | case RAID_VERSION: | |
6104 | case GET_ARRAY_INFO: | |
6105 | case GET_DISK_INFO: | |
6106 | break; | |
6107 | default: | |
6108 | if (!capable(CAP_SYS_ADMIN)) | |
6109 | return -EACCES; | |
6110 | } | |
1da177e4 LT |
6111 | |
6112 | /* | |
6113 | * Commands dealing with the RAID driver but not any | |
6114 | * particular array: | |
6115 | */ | |
6116 | switch (cmd) | |
6117 | { | |
6118 | case RAID_VERSION: | |
6119 | err = get_version(argp); | |
6120 | goto done; | |
6121 | ||
6122 | case PRINT_RAID_DEBUG: | |
6123 | err = 0; | |
6124 | md_print_devices(); | |
6125 | goto done; | |
6126 | ||
6127 | #ifndef MODULE | |
6128 | case RAID_AUTORUN: | |
6129 | err = 0; | |
6130 | autostart_arrays(arg); | |
6131 | goto done; | |
6132 | #endif | |
6133 | default:; | |
6134 | } | |
6135 | ||
6136 | /* | |
6137 | * Commands creating/starting a new array: | |
6138 | */ | |
6139 | ||
a39907fa | 6140 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6141 | |
6142 | if (!mddev) { | |
6143 | BUG(); | |
6144 | goto abort; | |
6145 | } | |
6146 | ||
1da177e4 LT |
6147 | err = mddev_lock(mddev); |
6148 | if (err) { | |
6149 | printk(KERN_INFO | |
6150 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
6151 | err, cmd); | |
6152 | goto abort; | |
6153 | } | |
6154 | ||
6155 | switch (cmd) | |
6156 | { | |
6157 | case SET_ARRAY_INFO: | |
6158 | { | |
6159 | mdu_array_info_t info; | |
6160 | if (!arg) | |
6161 | memset(&info, 0, sizeof(info)); | |
6162 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6163 | err = -EFAULT; | |
6164 | goto abort_unlock; | |
6165 | } | |
6166 | if (mddev->pers) { | |
6167 | err = update_array_info(mddev, &info); | |
6168 | if (err) { | |
6169 | printk(KERN_WARNING "md: couldn't update" | |
6170 | " array info. %d\n", err); | |
6171 | goto abort_unlock; | |
6172 | } | |
6173 | goto done_unlock; | |
6174 | } | |
6175 | if (!list_empty(&mddev->disks)) { | |
6176 | printk(KERN_WARNING | |
6177 | "md: array %s already has disks!\n", | |
6178 | mdname(mddev)); | |
6179 | err = -EBUSY; | |
6180 | goto abort_unlock; | |
6181 | } | |
6182 | if (mddev->raid_disks) { | |
6183 | printk(KERN_WARNING | |
6184 | "md: array %s already initialised!\n", | |
6185 | mdname(mddev)); | |
6186 | err = -EBUSY; | |
6187 | goto abort_unlock; | |
6188 | } | |
6189 | err = set_array_info(mddev, &info); | |
6190 | if (err) { | |
6191 | printk(KERN_WARNING "md: couldn't set" | |
6192 | " array info. %d\n", err); | |
6193 | goto abort_unlock; | |
6194 | } | |
6195 | } | |
6196 | goto done_unlock; | |
6197 | ||
6198 | default:; | |
6199 | } | |
6200 | ||
6201 | /* | |
6202 | * Commands querying/configuring an existing array: | |
6203 | */ | |
32a7627c | 6204 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6205 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6206 | if ((!mddev->raid_disks && !mddev->external) |
6207 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6208 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6209 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
6210 | err = -ENODEV; |
6211 | goto abort_unlock; | |
6212 | } | |
6213 | ||
6214 | /* | |
6215 | * Commands even a read-only array can execute: | |
6216 | */ | |
6217 | switch (cmd) | |
6218 | { | |
6219 | case GET_ARRAY_INFO: | |
6220 | err = get_array_info(mddev, argp); | |
6221 | goto done_unlock; | |
6222 | ||
32a7627c | 6223 | case GET_BITMAP_FILE: |
87162a28 | 6224 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
6225 | goto done_unlock; |
6226 | ||
1da177e4 LT |
6227 | case GET_DISK_INFO: |
6228 | err = get_disk_info(mddev, argp); | |
6229 | goto done_unlock; | |
6230 | ||
6231 | case RESTART_ARRAY_RW: | |
6232 | err = restart_array(mddev); | |
6233 | goto done_unlock; | |
6234 | ||
6235 | case STOP_ARRAY: | |
d710e138 | 6236 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
6237 | goto done_unlock; |
6238 | ||
6239 | case STOP_ARRAY_RO: | |
a4bd82d0 | 6240 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
6241 | goto done_unlock; |
6242 | ||
e2218350 DW |
6243 | case BLKROSET: |
6244 | if (get_user(ro, (int __user *)(arg))) { | |
6245 | err = -EFAULT; | |
6246 | goto done_unlock; | |
6247 | } | |
6248 | err = -EINVAL; | |
6249 | ||
6250 | /* if the bdev is going readonly the value of mddev->ro | |
6251 | * does not matter, no writes are coming | |
6252 | */ | |
6253 | if (ro) | |
6254 | goto done_unlock; | |
6255 | ||
6256 | /* are we are already prepared for writes? */ | |
6257 | if (mddev->ro != 1) | |
6258 | goto done_unlock; | |
6259 | ||
6260 | /* transitioning to readauto need only happen for | |
6261 | * arrays that call md_write_start | |
6262 | */ | |
6263 | if (mddev->pers) { | |
6264 | err = restart_array(mddev); | |
6265 | if (err == 0) { | |
6266 | mddev->ro = 2; | |
6267 | set_disk_ro(mddev->gendisk, 0); | |
6268 | } | |
6269 | } | |
6270 | goto done_unlock; | |
1da177e4 LT |
6271 | } |
6272 | ||
6273 | /* | |
6274 | * The remaining ioctls are changing the state of the | |
f91de92e N |
6275 | * superblock, so we do not allow them on read-only arrays. |
6276 | * However non-MD ioctls (e.g. get-size) will still come through | |
6277 | * here and hit the 'default' below, so only disallow | |
6278 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 6279 | */ |
bb57fc64 | 6280 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
6281 | if (mddev->ro == 2) { |
6282 | mddev->ro = 0; | |
00bcb4ac | 6283 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
6284 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
6285 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
6286 | } else { |
6287 | err = -EROFS; | |
6288 | goto abort_unlock; | |
6289 | } | |
1da177e4 LT |
6290 | } |
6291 | ||
6292 | switch (cmd) | |
6293 | { | |
6294 | case ADD_NEW_DISK: | |
6295 | { | |
6296 | mdu_disk_info_t info; | |
6297 | if (copy_from_user(&info, argp, sizeof(info))) | |
6298 | err = -EFAULT; | |
6299 | else | |
6300 | err = add_new_disk(mddev, &info); | |
6301 | goto done_unlock; | |
6302 | } | |
6303 | ||
6304 | case HOT_REMOVE_DISK: | |
6305 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
6306 | goto done_unlock; | |
6307 | ||
6308 | case HOT_ADD_DISK: | |
6309 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
6310 | goto done_unlock; | |
6311 | ||
6312 | case SET_DISK_FAULTY: | |
6313 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
6314 | goto done_unlock; | |
6315 | ||
6316 | case RUN_ARRAY: | |
d710e138 | 6317 | err = do_md_run(mddev); |
1da177e4 LT |
6318 | goto done_unlock; |
6319 | ||
32a7627c N |
6320 | case SET_BITMAP_FILE: |
6321 | err = set_bitmap_file(mddev, (int)arg); | |
6322 | goto done_unlock; | |
6323 | ||
1da177e4 | 6324 | default: |
1da177e4 LT |
6325 | err = -EINVAL; |
6326 | goto abort_unlock; | |
6327 | } | |
6328 | ||
6329 | done_unlock: | |
6330 | abort_unlock: | |
d3374825 N |
6331 | if (mddev->hold_active == UNTIL_IOCTL && |
6332 | err != -EINVAL) | |
6333 | mddev->hold_active = 0; | |
1da177e4 LT |
6334 | mddev_unlock(mddev); |
6335 | ||
6336 | return err; | |
6337 | done: | |
6338 | if (err) | |
6339 | MD_BUG(); | |
6340 | abort: | |
6341 | return err; | |
6342 | } | |
aa98aa31 AB |
6343 | #ifdef CONFIG_COMPAT |
6344 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6345 | unsigned int cmd, unsigned long arg) | |
6346 | { | |
6347 | switch (cmd) { | |
6348 | case HOT_REMOVE_DISK: | |
6349 | case HOT_ADD_DISK: | |
6350 | case SET_DISK_FAULTY: | |
6351 | case SET_BITMAP_FILE: | |
6352 | /* These take in integer arg, do not convert */ | |
6353 | break; | |
6354 | default: | |
6355 | arg = (unsigned long)compat_ptr(arg); | |
6356 | break; | |
6357 | } | |
6358 | ||
6359 | return md_ioctl(bdev, mode, cmd, arg); | |
6360 | } | |
6361 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6362 | |
a39907fa | 6363 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6364 | { |
6365 | /* | |
6366 | * Succeed if we can lock the mddev, which confirms that | |
6367 | * it isn't being stopped right now. | |
6368 | */ | |
fd01b88c | 6369 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6370 | int err; |
6371 | ||
d3374825 N |
6372 | if (mddev->gendisk != bdev->bd_disk) { |
6373 | /* we are racing with mddev_put which is discarding this | |
6374 | * bd_disk. | |
6375 | */ | |
6376 | mddev_put(mddev); | |
6377 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6378 | flush_workqueue(md_misc_wq); |
d3374825 N |
6379 | /* Then retry the open from the top */ |
6380 | return -ERESTARTSYS; | |
6381 | } | |
6382 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6383 | ||
c8c00a69 | 6384 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6385 | goto out; |
6386 | ||
6387 | err = 0; | |
f2ea68cf | 6388 | atomic_inc(&mddev->openers); |
c8c00a69 | 6389 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6390 | |
f0b4f7e2 | 6391 | check_disk_change(bdev); |
1da177e4 LT |
6392 | out: |
6393 | return err; | |
6394 | } | |
6395 | ||
a39907fa | 6396 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6397 | { |
fd01b88c | 6398 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6399 | |
52e5f9d1 | 6400 | BUG_ON(!mddev); |
f2ea68cf | 6401 | atomic_dec(&mddev->openers); |
1da177e4 LT |
6402 | mddev_put(mddev); |
6403 | ||
6404 | return 0; | |
6405 | } | |
f0b4f7e2 N |
6406 | |
6407 | static int md_media_changed(struct gendisk *disk) | |
6408 | { | |
fd01b88c | 6409 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6410 | |
6411 | return mddev->changed; | |
6412 | } | |
6413 | ||
6414 | static int md_revalidate(struct gendisk *disk) | |
6415 | { | |
fd01b88c | 6416 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6417 | |
6418 | mddev->changed = 0; | |
6419 | return 0; | |
6420 | } | |
83d5cde4 | 6421 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6422 | { |
6423 | .owner = THIS_MODULE, | |
a39907fa AV |
6424 | .open = md_open, |
6425 | .release = md_release, | |
b492b852 | 6426 | .ioctl = md_ioctl, |
aa98aa31 AB |
6427 | #ifdef CONFIG_COMPAT |
6428 | .compat_ioctl = md_compat_ioctl, | |
6429 | #endif | |
a885c8c4 | 6430 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6431 | .media_changed = md_media_changed, |
6432 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6433 | }; |
6434 | ||
75c96f85 | 6435 | static int md_thread(void * arg) |
1da177e4 | 6436 | { |
2b8bf345 | 6437 | struct md_thread *thread = arg; |
1da177e4 | 6438 | |
1da177e4 LT |
6439 | /* |
6440 | * md_thread is a 'system-thread', it's priority should be very | |
6441 | * high. We avoid resource deadlocks individually in each | |
6442 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6443 | * the very same RT priority as kswapd, thus we will never get | |
6444 | * into a priority inversion deadlock. | |
6445 | * | |
6446 | * we definitely have to have equal or higher priority than | |
6447 | * bdflush, otherwise bdflush will deadlock if there are too | |
6448 | * many dirty RAID5 blocks. | |
6449 | */ | |
1da177e4 | 6450 | |
6985c43f | 6451 | allow_signal(SIGKILL); |
a6fb0934 | 6452 | while (!kthread_should_stop()) { |
1da177e4 | 6453 | |
93588e22 N |
6454 | /* We need to wait INTERRUPTIBLE so that |
6455 | * we don't add to the load-average. | |
6456 | * That means we need to be sure no signals are | |
6457 | * pending | |
6458 | */ | |
6459 | if (signal_pending(current)) | |
6460 | flush_signals(current); | |
6461 | ||
6462 | wait_event_interruptible_timeout | |
6463 | (thread->wqueue, | |
6464 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6465 | || kthread_should_stop(), | |
6466 | thread->timeout); | |
1da177e4 | 6467 | |
6c987910 N |
6468 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6469 | if (!kthread_should_stop()) | |
589a594b | 6470 | thread->run(thread->mddev); |
1da177e4 | 6471 | } |
a6fb0934 | 6472 | |
1da177e4 LT |
6473 | return 0; |
6474 | } | |
6475 | ||
2b8bf345 | 6476 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
6477 | { |
6478 | if (thread) { | |
36a4e1fe | 6479 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
6480 | set_bit(THREAD_WAKEUP, &thread->flags); |
6481 | wake_up(&thread->wqueue); | |
6482 | } | |
6483 | } | |
6484 | ||
2b8bf345 | 6485 | struct md_thread *md_register_thread(void (*run) (struct mddev *), struct mddev *mddev, |
1da177e4 LT |
6486 | const char *name) |
6487 | { | |
2b8bf345 | 6488 | struct md_thread *thread; |
1da177e4 | 6489 | |
2b8bf345 | 6490 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
6491 | if (!thread) |
6492 | return NULL; | |
6493 | ||
1da177e4 LT |
6494 | init_waitqueue_head(&thread->wqueue); |
6495 | ||
1da177e4 LT |
6496 | thread->run = run; |
6497 | thread->mddev = mddev; | |
32a7627c | 6498 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6499 | thread->tsk = kthread_run(md_thread, thread, |
6500 | "%s_%s", | |
6501 | mdname(thread->mddev), | |
6502 | name ?: mddev->pers->name); | |
a6fb0934 | 6503 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6504 | kfree(thread); |
6505 | return NULL; | |
6506 | } | |
1da177e4 LT |
6507 | return thread; |
6508 | } | |
6509 | ||
2b8bf345 | 6510 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 6511 | { |
2b8bf345 | 6512 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
6513 | if (!thread) |
6514 | return; | |
36a4e1fe | 6515 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
6516 | /* Locking ensures that mddev_unlock does not wake_up a |
6517 | * non-existent thread | |
6518 | */ | |
6519 | spin_lock(&pers_lock); | |
6520 | *threadp = NULL; | |
6521 | spin_unlock(&pers_lock); | |
a6fb0934 N |
6522 | |
6523 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6524 | kfree(thread); |
6525 | } | |
6526 | ||
fd01b88c | 6527 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
6528 | { |
6529 | if (!mddev) { | |
6530 | MD_BUG(); | |
6531 | return; | |
6532 | } | |
6533 | ||
b2d444d7 | 6534 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6535 | return; |
6bfe0b49 | 6536 | |
de393cde | 6537 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
6538 | return; |
6539 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6540 | if (mddev->degraded) |
6541 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6542 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6543 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6544 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6545 | md_wakeup_thread(mddev->thread); | |
768a418d | 6546 | if (mddev->event_work.func) |
e804ac78 | 6547 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6548 | md_new_event_inintr(mddev); |
1da177e4 LT |
6549 | } |
6550 | ||
6551 | /* seq_file implementation /proc/mdstat */ | |
6552 | ||
6553 | static void status_unused(struct seq_file *seq) | |
6554 | { | |
6555 | int i = 0; | |
3cb03002 | 6556 | struct md_rdev *rdev; |
1da177e4 LT |
6557 | |
6558 | seq_printf(seq, "unused devices: "); | |
6559 | ||
159ec1fc | 6560 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6561 | char b[BDEVNAME_SIZE]; |
6562 | i++; | |
6563 | seq_printf(seq, "%s ", | |
6564 | bdevname(rdev->bdev,b)); | |
6565 | } | |
6566 | if (!i) | |
6567 | seq_printf(seq, "<none>"); | |
6568 | ||
6569 | seq_printf(seq, "\n"); | |
6570 | } | |
6571 | ||
6572 | ||
fd01b88c | 6573 | static void status_resync(struct seq_file *seq, struct mddev * mddev) |
1da177e4 | 6574 | { |
dd71cf6b N |
6575 | sector_t max_sectors, resync, res; |
6576 | unsigned long dt, db; | |
6577 | sector_t rt; | |
4588b42e N |
6578 | int scale; |
6579 | unsigned int per_milli; | |
1da177e4 | 6580 | |
dd71cf6b | 6581 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6582 | |
6583 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6584 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6585 | else |
dd71cf6b | 6586 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6587 | |
6588 | /* | |
6589 | * Should not happen. | |
6590 | */ | |
dd71cf6b | 6591 | if (!max_sectors) { |
1da177e4 LT |
6592 | MD_BUG(); |
6593 | return; | |
6594 | } | |
4588b42e | 6595 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6596 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6597 | * u32, as those are the requirements for sector_div. |
6598 | * Thus 'scale' must be at least 10 | |
6599 | */ | |
6600 | scale = 10; | |
6601 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6602 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6603 | scale++; |
6604 | } | |
6605 | res = (resync>>scale)*1000; | |
dd71cf6b | 6606 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6607 | |
6608 | per_milli = res; | |
1da177e4 | 6609 | { |
4588b42e | 6610 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6611 | seq_printf(seq, "["); |
6612 | for (i = 0; i < x; i++) | |
6613 | seq_printf(seq, "="); | |
6614 | seq_printf(seq, ">"); | |
6615 | for (i = 0; i < y; i++) | |
6616 | seq_printf(seq, "."); | |
6617 | seq_printf(seq, "] "); | |
6618 | } | |
4588b42e | 6619 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6620 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6621 | "reshape" : | |
61df9d91 N |
6622 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6623 | "check" : | |
6624 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6625 | "resync" : "recovery"))), | |
6626 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6627 | (unsigned long long) resync/2, |
6628 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6629 | |
6630 | /* | |
1da177e4 LT |
6631 | * dt: time from mark until now |
6632 | * db: blocks written from mark until now | |
6633 | * rt: remaining time | |
dd71cf6b N |
6634 | * |
6635 | * rt is a sector_t, so could be 32bit or 64bit. | |
6636 | * So we divide before multiply in case it is 32bit and close | |
6637 | * to the limit. | |
25985edc | 6638 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6639 | * near the end of resync when the number of remaining sectors |
6640 | * is close to 'db'. | |
6641 | * We then divide rt by 32 after multiplying by db to compensate. | |
6642 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6643 | */ |
6644 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6645 | if (!dt) dt++; | |
ff4e8d9a N |
6646 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6647 | - mddev->resync_mark_cnt; | |
1da177e4 | 6648 | |
dd71cf6b N |
6649 | rt = max_sectors - resync; /* number of remaining sectors */ |
6650 | sector_div(rt, db/32+1); | |
6651 | rt *= dt; | |
6652 | rt >>= 5; | |
6653 | ||
6654 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6655 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6656 | |
ff4e8d9a | 6657 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6658 | } |
6659 | ||
6660 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6661 | { | |
6662 | struct list_head *tmp; | |
6663 | loff_t l = *pos; | |
fd01b88c | 6664 | struct mddev *mddev; |
1da177e4 LT |
6665 | |
6666 | if (l >= 0x10000) | |
6667 | return NULL; | |
6668 | if (!l--) | |
6669 | /* header */ | |
6670 | return (void*)1; | |
6671 | ||
6672 | spin_lock(&all_mddevs_lock); | |
6673 | list_for_each(tmp,&all_mddevs) | |
6674 | if (!l--) { | |
fd01b88c | 6675 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
6676 | mddev_get(mddev); |
6677 | spin_unlock(&all_mddevs_lock); | |
6678 | return mddev; | |
6679 | } | |
6680 | spin_unlock(&all_mddevs_lock); | |
6681 | if (!l--) | |
6682 | return (void*)2;/* tail */ | |
6683 | return NULL; | |
6684 | } | |
6685 | ||
6686 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6687 | { | |
6688 | struct list_head *tmp; | |
fd01b88c | 6689 | struct mddev *next_mddev, *mddev = v; |
1da177e4 LT |
6690 | |
6691 | ++*pos; | |
6692 | if (v == (void*)2) | |
6693 | return NULL; | |
6694 | ||
6695 | spin_lock(&all_mddevs_lock); | |
6696 | if (v == (void*)1) | |
6697 | tmp = all_mddevs.next; | |
6698 | else | |
6699 | tmp = mddev->all_mddevs.next; | |
6700 | if (tmp != &all_mddevs) | |
fd01b88c | 6701 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
6702 | else { |
6703 | next_mddev = (void*)2; | |
6704 | *pos = 0x10000; | |
6705 | } | |
6706 | spin_unlock(&all_mddevs_lock); | |
6707 | ||
6708 | if (v != (void*)1) | |
6709 | mddev_put(mddev); | |
6710 | return next_mddev; | |
6711 | ||
6712 | } | |
6713 | ||
6714 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6715 | { | |
fd01b88c | 6716 | struct mddev *mddev = v; |
1da177e4 LT |
6717 | |
6718 | if (mddev && v != (void*)1 && v != (void*)2) | |
6719 | mddev_put(mddev); | |
6720 | } | |
6721 | ||
6722 | static int md_seq_show(struct seq_file *seq, void *v) | |
6723 | { | |
fd01b88c | 6724 | struct mddev *mddev = v; |
dd8ac336 | 6725 | sector_t sectors; |
3cb03002 | 6726 | struct md_rdev *rdev; |
32a7627c | 6727 | struct bitmap *bitmap; |
1da177e4 LT |
6728 | |
6729 | if (v == (void*)1) { | |
84fc4b56 | 6730 | struct md_personality *pers; |
1da177e4 LT |
6731 | seq_printf(seq, "Personalities : "); |
6732 | spin_lock(&pers_lock); | |
2604b703 N |
6733 | list_for_each_entry(pers, &pers_list, list) |
6734 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6735 | |
6736 | spin_unlock(&pers_lock); | |
6737 | seq_printf(seq, "\n"); | |
f1514638 | 6738 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
6739 | return 0; |
6740 | } | |
6741 | if (v == (void*)2) { | |
6742 | status_unused(seq); | |
6743 | return 0; | |
6744 | } | |
6745 | ||
5dc5cf7d | 6746 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6747 | return -EINTR; |
5dc5cf7d | 6748 | |
1da177e4 LT |
6749 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6750 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6751 | mddev->pers ? "" : "in"); | |
6752 | if (mddev->pers) { | |
f91de92e | 6753 | if (mddev->ro==1) |
1da177e4 | 6754 | seq_printf(seq, " (read-only)"); |
f91de92e | 6755 | if (mddev->ro==2) |
52720ae7 | 6756 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6757 | seq_printf(seq, " %s", mddev->pers->name); |
6758 | } | |
6759 | ||
dd8ac336 | 6760 | sectors = 0; |
159ec1fc | 6761 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6762 | char b[BDEVNAME_SIZE]; |
6763 | seq_printf(seq, " %s[%d]", | |
6764 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6765 | if (test_bit(WriteMostly, &rdev->flags)) |
6766 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6767 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6768 | seq_printf(seq, "(F)"); |
6769 | continue; | |
2d78f8c4 N |
6770 | } |
6771 | if (rdev->raid_disk < 0) | |
b325a32e | 6772 | seq_printf(seq, "(S)"); /* spare */ |
2d78f8c4 N |
6773 | if (test_bit(Replacement, &rdev->flags)) |
6774 | seq_printf(seq, "(R)"); | |
dd8ac336 | 6775 | sectors += rdev->sectors; |
1da177e4 LT |
6776 | } |
6777 | ||
6778 | if (!list_empty(&mddev->disks)) { | |
6779 | if (mddev->pers) | |
6780 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6781 | (unsigned long long) |
6782 | mddev->array_sectors / 2); | |
1da177e4 LT |
6783 | else |
6784 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6785 | (unsigned long long)sectors / 2); |
1da177e4 | 6786 | } |
1cd6bf19 N |
6787 | if (mddev->persistent) { |
6788 | if (mddev->major_version != 0 || | |
6789 | mddev->minor_version != 90) { | |
6790 | seq_printf(seq," super %d.%d", | |
6791 | mddev->major_version, | |
6792 | mddev->minor_version); | |
6793 | } | |
e691063a N |
6794 | } else if (mddev->external) |
6795 | seq_printf(seq, " super external:%s", | |
6796 | mddev->metadata_type); | |
6797 | else | |
1cd6bf19 | 6798 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6799 | |
6800 | if (mddev->pers) { | |
d710e138 | 6801 | mddev->pers->status(seq, mddev); |
1da177e4 | 6802 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6803 | if (mddev->pers->sync_request) { |
6804 | if (mddev->curr_resync > 2) { | |
d710e138 | 6805 | status_resync(seq, mddev); |
8e1b39d6 N |
6806 | seq_printf(seq, "\n "); |
6807 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6808 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6809 | else if (mddev->recovery_cp < MaxSector) | |
6810 | seq_printf(seq, "\tresync=PENDING\n "); | |
6811 | } | |
32a7627c N |
6812 | } else |
6813 | seq_printf(seq, "\n "); | |
6814 | ||
6815 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6816 | unsigned long chunk_kb; |
6817 | unsigned long flags; | |
32a7627c | 6818 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6819 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6820 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6821 | "%lu%s chunk", | |
6822 | bitmap->pages - bitmap->missing_pages, | |
6823 | bitmap->pages, | |
6824 | (bitmap->pages - bitmap->missing_pages) | |
6825 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6826 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6827 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6828 | if (bitmap->file) { |
6829 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6830 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6831 | } |
78d742d8 | 6832 | |
32a7627c N |
6833 | seq_printf(seq, "\n"); |
6834 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6835 | } |
6836 | ||
6837 | seq_printf(seq, "\n"); | |
6838 | } | |
6839 | mddev_unlock(mddev); | |
6840 | ||
6841 | return 0; | |
6842 | } | |
6843 | ||
110518bc | 6844 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6845 | .start = md_seq_start, |
6846 | .next = md_seq_next, | |
6847 | .stop = md_seq_stop, | |
6848 | .show = md_seq_show, | |
6849 | }; | |
6850 | ||
6851 | static int md_seq_open(struct inode *inode, struct file *file) | |
6852 | { | |
f1514638 | 6853 | struct seq_file *seq; |
1da177e4 LT |
6854 | int error; |
6855 | ||
6856 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 6857 | if (error) |
f1514638 KS |
6858 | return error; |
6859 | ||
6860 | seq = file->private_data; | |
6861 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
6862 | return error; |
6863 | } | |
6864 | ||
d7603b7e N |
6865 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6866 | { | |
f1514638 | 6867 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
6868 | int mask; |
6869 | ||
6870 | poll_wait(filp, &md_event_waiters, wait); | |
6871 | ||
6872 | /* always allow read */ | |
6873 | mask = POLLIN | POLLRDNORM; | |
6874 | ||
f1514638 | 6875 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
6876 | mask |= POLLERR | POLLPRI; |
6877 | return mask; | |
6878 | } | |
6879 | ||
fa027c2a | 6880 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6881 | .owner = THIS_MODULE, |
1da177e4 LT |
6882 | .open = md_seq_open, |
6883 | .read = seq_read, | |
6884 | .llseek = seq_lseek, | |
c3f94b40 | 6885 | .release = seq_release_private, |
d7603b7e | 6886 | .poll = mdstat_poll, |
1da177e4 LT |
6887 | }; |
6888 | ||
84fc4b56 | 6889 | int register_md_personality(struct md_personality *p) |
1da177e4 | 6890 | { |
1da177e4 | 6891 | spin_lock(&pers_lock); |
2604b703 N |
6892 | list_add_tail(&p->list, &pers_list); |
6893 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6894 | spin_unlock(&pers_lock); |
6895 | return 0; | |
6896 | } | |
6897 | ||
84fc4b56 | 6898 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 6899 | { |
2604b703 | 6900 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6901 | spin_lock(&pers_lock); |
2604b703 | 6902 | list_del_init(&p->list); |
1da177e4 LT |
6903 | spin_unlock(&pers_lock); |
6904 | return 0; | |
6905 | } | |
6906 | ||
fd01b88c | 6907 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 6908 | { |
3cb03002 | 6909 | struct md_rdev * rdev; |
1da177e4 | 6910 | int idle; |
eea1bf38 | 6911 | int curr_events; |
1da177e4 LT |
6912 | |
6913 | idle = 1; | |
4b80991c N |
6914 | rcu_read_lock(); |
6915 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6916 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6917 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6918 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6919 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6920 | /* sync IO will cause sync_io to increase before the disk_stats |
6921 | * as sync_io is counted when a request starts, and | |
6922 | * disk_stats is counted when it completes. | |
6923 | * So resync activity will cause curr_events to be smaller than | |
6924 | * when there was no such activity. | |
6925 | * non-sync IO will cause disk_stat to increase without | |
6926 | * increasing sync_io so curr_events will (eventually) | |
6927 | * be larger than it was before. Once it becomes | |
6928 | * substantially larger, the test below will cause | |
6929 | * the array to appear non-idle, and resync will slow | |
6930 | * down. | |
6931 | * If there is a lot of outstanding resync activity when | |
6932 | * we set last_event to curr_events, then all that activity | |
6933 | * completing might cause the array to appear non-idle | |
6934 | * and resync will be slowed down even though there might | |
6935 | * not have been non-resync activity. This will only | |
6936 | * happen once though. 'last_events' will soon reflect | |
6937 | * the state where there is little or no outstanding | |
6938 | * resync requests, and further resync activity will | |
6939 | * always make curr_events less than last_events. | |
c0e48521 | 6940 | * |
1da177e4 | 6941 | */ |
eea1bf38 | 6942 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6943 | rdev->last_events = curr_events; |
6944 | idle = 0; | |
6945 | } | |
6946 | } | |
4b80991c | 6947 | rcu_read_unlock(); |
1da177e4 LT |
6948 | return idle; |
6949 | } | |
6950 | ||
fd01b88c | 6951 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
6952 | { |
6953 | /* another "blocks" (512byte) blocks have been synced */ | |
6954 | atomic_sub(blocks, &mddev->recovery_active); | |
6955 | wake_up(&mddev->recovery_wait); | |
6956 | if (!ok) { | |
dfc70645 | 6957 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6958 | md_wakeup_thread(mddev->thread); |
6959 | // stop recovery, signal do_sync .... | |
6960 | } | |
6961 | } | |
6962 | ||
6963 | ||
06d91a5f N |
6964 | /* md_write_start(mddev, bi) |
6965 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6966 | * in superblock) before writing, schedule a superblock update |
6967 | * and wait for it to complete. | |
06d91a5f | 6968 | */ |
fd01b88c | 6969 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 6970 | { |
0fd62b86 | 6971 | int did_change = 0; |
06d91a5f | 6972 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6973 | return; |
06d91a5f | 6974 | |
f91de92e N |
6975 | BUG_ON(mddev->ro == 1); |
6976 | if (mddev->ro == 2) { | |
6977 | /* need to switch to read/write */ | |
6978 | mddev->ro = 0; | |
6979 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6980 | md_wakeup_thread(mddev->thread); | |
25156198 | 6981 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6982 | did_change = 1; |
f91de92e | 6983 | } |
06d91a5f | 6984 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6985 | if (mddev->safemode == 1) |
6986 | mddev->safemode = 0; | |
06d91a5f | 6987 | if (mddev->in_sync) { |
a9701a30 | 6988 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6989 | if (mddev->in_sync) { |
6990 | mddev->in_sync = 0; | |
850b2b42 | 6991 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 6992 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 6993 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6994 | did_change = 1; |
3d310eb7 | 6995 | } |
a9701a30 | 6996 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6997 | } |
0fd62b86 | 6998 | if (did_change) |
00bcb4ac | 6999 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 7000 | wait_event(mddev->sb_wait, |
09a44cc1 | 7001 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
7002 | } |
7003 | ||
fd01b88c | 7004 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
7005 | { |
7006 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
7007 | if (mddev->safemode == 2) | |
7008 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 7009 | else if (mddev->safemode_delay) |
1da177e4 LT |
7010 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
7011 | } | |
7012 | } | |
7013 | ||
2a2275d6 N |
7014 | /* md_allow_write(mddev) |
7015 | * Calling this ensures that the array is marked 'active' so that writes | |
7016 | * may proceed without blocking. It is important to call this before | |
7017 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
7018 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
7019 | * |
7020 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
7021 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 7022 | */ |
fd01b88c | 7023 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
7024 | { |
7025 | if (!mddev->pers) | |
b5470dc5 | 7026 | return 0; |
2a2275d6 | 7027 | if (mddev->ro) |
b5470dc5 | 7028 | return 0; |
1a0fd497 | 7029 | if (!mddev->pers->sync_request) |
b5470dc5 | 7030 | return 0; |
2a2275d6 N |
7031 | |
7032 | spin_lock_irq(&mddev->write_lock); | |
7033 | if (mddev->in_sync) { | |
7034 | mddev->in_sync = 0; | |
7035 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 7036 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
7037 | if (mddev->safemode_delay && |
7038 | mddev->safemode == 0) | |
7039 | mddev->safemode = 1; | |
7040 | spin_unlock_irq(&mddev->write_lock); | |
7041 | md_update_sb(mddev, 0); | |
00bcb4ac | 7042 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
7043 | } else |
7044 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 7045 | |
070dc6dd | 7046 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
7047 | return -EAGAIN; |
7048 | else | |
7049 | return 0; | |
2a2275d6 N |
7050 | } |
7051 | EXPORT_SYMBOL_GPL(md_allow_write); | |
7052 | ||
1da177e4 LT |
7053 | #define SYNC_MARKS 10 |
7054 | #define SYNC_MARK_STEP (3*HZ) | |
fd01b88c | 7055 | void md_do_sync(struct mddev *mddev) |
1da177e4 | 7056 | { |
fd01b88c | 7057 | struct mddev *mddev2; |
1da177e4 LT |
7058 | unsigned int currspeed = 0, |
7059 | window; | |
57afd89f | 7060 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
7061 | unsigned long mark[SYNC_MARKS]; |
7062 | sector_t mark_cnt[SYNC_MARKS]; | |
7063 | int last_mark,m; | |
7064 | struct list_head *tmp; | |
7065 | sector_t last_check; | |
57afd89f | 7066 | int skipped = 0; |
3cb03002 | 7067 | struct md_rdev *rdev; |
61df9d91 | 7068 | char *desc; |
1da177e4 LT |
7069 | |
7070 | /* just incase thread restarts... */ | |
7071 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7072 | return; | |
5fd6c1dc N |
7073 | if (mddev->ro) /* never try to sync a read-only array */ |
7074 | return; | |
1da177e4 | 7075 | |
61df9d91 N |
7076 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
7077 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
7078 | desc = "data-check"; | |
7079 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7080 | desc = "requested-resync"; | |
7081 | else | |
7082 | desc = "resync"; | |
7083 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7084 | desc = "reshape"; | |
7085 | else | |
7086 | desc = "recovery"; | |
7087 | ||
1da177e4 LT |
7088 | /* we overload curr_resync somewhat here. |
7089 | * 0 == not engaged in resync at all | |
7090 | * 2 == checking that there is no conflict with another sync | |
7091 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7092 | * commense | |
7093 | * other == active in resync - this many blocks | |
7094 | * | |
7095 | * Before starting a resync we must have set curr_resync to | |
7096 | * 2, and then checked that every "conflicting" array has curr_resync | |
7097 | * less than ours. When we find one that is the same or higher | |
7098 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7099 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7100 | * This will mean we have to start checking from the beginning again. | |
7101 | * | |
7102 | */ | |
7103 | ||
7104 | do { | |
7105 | mddev->curr_resync = 2; | |
7106 | ||
7107 | try_again: | |
404e4b43 | 7108 | if (kthread_should_stop()) |
6985c43f | 7109 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
7110 | |
7111 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 7112 | goto skip; |
29ac4aa3 | 7113 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7114 | if (mddev2 == mddev) |
7115 | continue; | |
90b08710 BS |
7116 | if (!mddev->parallel_resync |
7117 | && mddev2->curr_resync | |
7118 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7119 | DEFINE_WAIT(wq); |
7120 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7121 | /* arbitrarily yield */ | |
7122 | mddev->curr_resync = 1; | |
7123 | wake_up(&resync_wait); | |
7124 | } | |
7125 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7126 | /* no need to wait here, we can wait the next | |
7127 | * time 'round when curr_resync == 2 | |
7128 | */ | |
7129 | continue; | |
9744197c N |
7130 | /* We need to wait 'interruptible' so as not to |
7131 | * contribute to the load average, and not to | |
7132 | * be caught by 'softlockup' | |
7133 | */ | |
7134 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 7135 | if (!kthread_should_stop() && |
8712e553 | 7136 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7137 | printk(KERN_INFO "md: delaying %s of %s" |
7138 | " until %s has finished (they" | |
1da177e4 | 7139 | " share one or more physical units)\n", |
61df9d91 | 7140 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7141 | mddev_put(mddev2); |
9744197c N |
7142 | if (signal_pending(current)) |
7143 | flush_signals(current); | |
1da177e4 LT |
7144 | schedule(); |
7145 | finish_wait(&resync_wait, &wq); | |
7146 | goto try_again; | |
7147 | } | |
7148 | finish_wait(&resync_wait, &wq); | |
7149 | } | |
7150 | } | |
7151 | } while (mddev->curr_resync < 2); | |
7152 | ||
5fd6c1dc | 7153 | j = 0; |
9d88883e | 7154 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7155 | /* resync follows the size requested by the personality, |
57afd89f | 7156 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7157 | */ |
7158 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 7159 | mddev->resync_mismatches = 0; |
5fd6c1dc | 7160 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7161 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7162 | j = mddev->resync_min; | |
7163 | else if (!mddev->bitmap) | |
5fd6c1dc | 7164 | j = mddev->recovery_cp; |
5e96ee65 | 7165 | |
ccfcc3c1 | 7166 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 7167 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7168 | else { |
1da177e4 | 7169 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7170 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7171 | j = MaxSector; |
4e59ca7d DW |
7172 | rcu_read_lock(); |
7173 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
7174 | if (rdev->raid_disk >= 0 && |
7175 | !test_bit(Faulty, &rdev->flags) && | |
7176 | !test_bit(In_sync, &rdev->flags) && | |
7177 | rdev->recovery_offset < j) | |
7178 | j = rdev->recovery_offset; | |
4e59ca7d | 7179 | rcu_read_unlock(); |
5fd6c1dc | 7180 | } |
1da177e4 | 7181 | |
61df9d91 N |
7182 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7183 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7184 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7185 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7186 | "(but not more than %d KB/sec) for %s.\n", |
7187 | speed_max(mddev), desc); | |
1da177e4 | 7188 | |
eea1bf38 | 7189 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7190 | |
57afd89f | 7191 | io_sectors = 0; |
1da177e4 LT |
7192 | for (m = 0; m < SYNC_MARKS; m++) { |
7193 | mark[m] = jiffies; | |
57afd89f | 7194 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7195 | } |
7196 | last_mark = 0; | |
7197 | mddev->resync_mark = mark[last_mark]; | |
7198 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7199 | ||
7200 | /* | |
7201 | * Tune reconstruction: | |
7202 | */ | |
7203 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7204 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7205 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7206 | |
7207 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7208 | last_check = 0; |
7209 | ||
7210 | if (j>2) { | |
7211 | printk(KERN_INFO | |
61df9d91 N |
7212 | "md: resuming %s of %s from checkpoint.\n", |
7213 | desc, mdname(mddev)); | |
1da177e4 LT |
7214 | mddev->curr_resync = j; |
7215 | } | |
75d3da43 | 7216 | mddev->curr_resync_completed = j; |
1da177e4 LT |
7217 | |
7218 | while (j < max_sectors) { | |
57afd89f | 7219 | sector_t sectors; |
1da177e4 | 7220 | |
57afd89f | 7221 | skipped = 0; |
97e4f42d | 7222 | |
7a91ee1f N |
7223 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7224 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7225 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7226 | > (max_sectors >> 4)) || | |
7227 | (j - mddev->curr_resync_completed)*2 | |
7228 | >= mddev->resync_max - mddev->curr_resync_completed | |
7229 | )) { | |
97e4f42d | 7230 | /* time to update curr_resync_completed */ |
97e4f42d N |
7231 | wait_event(mddev->recovery_wait, |
7232 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7233 | mddev->curr_resync_completed = j; |
070dc6dd | 7234 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7235 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7236 | } |
acb180b0 | 7237 | |
e62e58a5 N |
7238 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
7239 | /* As this condition is controlled by user-space, | |
7240 | * we can block indefinitely, so use '_interruptible' | |
7241 | * to avoid triggering warnings. | |
7242 | */ | |
7243 | flush_signals(current); /* just in case */ | |
7244 | wait_event_interruptible(mddev->recovery_wait, | |
7245 | mddev->resync_max > j | |
7246 | || kthread_should_stop()); | |
7247 | } | |
acb180b0 N |
7248 | |
7249 | if (kthread_should_stop()) | |
7250 | goto interrupted; | |
7251 | ||
57afd89f | 7252 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7253 | currspeed < speed_min(mddev)); |
57afd89f | 7254 | if (sectors == 0) { |
dfc70645 | 7255 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
7256 | goto out; |
7257 | } | |
57afd89f N |
7258 | |
7259 | if (!skipped) { /* actual IO requested */ | |
7260 | io_sectors += sectors; | |
7261 | atomic_add(sectors, &mddev->recovery_active); | |
7262 | } | |
7263 | ||
e875ecea N |
7264 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7265 | break; | |
7266 | ||
1da177e4 LT |
7267 | j += sectors; |
7268 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 7269 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7270 | if (last_check == 0) |
e875ecea | 7271 | /* this is the earliest that rebuild will be |
d7603b7e N |
7272 | * visible in /proc/mdstat |
7273 | */ | |
7274 | md_new_event(mddev); | |
57afd89f N |
7275 | |
7276 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7277 | continue; |
7278 | ||
57afd89f | 7279 | last_check = io_sectors; |
1da177e4 LT |
7280 | repeat: |
7281 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7282 | /* step marks */ | |
7283 | int next = (last_mark+1) % SYNC_MARKS; | |
7284 | ||
7285 | mddev->resync_mark = mark[next]; | |
7286 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7287 | mark[next] = jiffies; | |
57afd89f | 7288 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7289 | last_mark = next; |
7290 | } | |
7291 | ||
7292 | ||
c6207277 N |
7293 | if (kthread_should_stop()) |
7294 | goto interrupted; | |
7295 | ||
1da177e4 LT |
7296 | |
7297 | /* | |
7298 | * this loop exits only if either when we are slower than | |
7299 | * the 'hard' speed limit, or the system was IO-idle for | |
7300 | * a jiffy. | |
7301 | * the system might be non-idle CPU-wise, but we only care | |
7302 | * about not overloading the IO subsystem. (things like an | |
7303 | * e2fsck being done on the RAID array should execute fast) | |
7304 | */ | |
1da177e4 LT |
7305 | cond_resched(); |
7306 | ||
57afd89f N |
7307 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
7308 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 7309 | |
88202a0c N |
7310 | if (currspeed > speed_min(mddev)) { |
7311 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7312 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7313 | msleep(500); |
1da177e4 LT |
7314 | goto repeat; |
7315 | } | |
7316 | } | |
7317 | } | |
61df9d91 | 7318 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
7319 | /* |
7320 | * this also signals 'finished resyncing' to md_stop | |
7321 | */ | |
7322 | out: | |
1da177e4 LT |
7323 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7324 | ||
7325 | /* tell personality that we are finished */ | |
57afd89f | 7326 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7327 | |
dfc70645 | 7328 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7329 | mddev->curr_resync > 2) { |
7330 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7331 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7332 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7333 | printk(KERN_INFO | |
61df9d91 N |
7334 | "md: checkpointing %s of %s.\n", |
7335 | desc, mdname(mddev)); | |
5fd6c1dc N |
7336 | mddev->recovery_cp = mddev->curr_resync; |
7337 | } | |
7338 | } else | |
7339 | mddev->recovery_cp = MaxSector; | |
7340 | } else { | |
7341 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7342 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
7343 | rcu_read_lock(); |
7344 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 7345 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7346 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7347 | !test_bit(Faulty, &rdev->flags) && |
7348 | !test_bit(In_sync, &rdev->flags) && | |
7349 | rdev->recovery_offset < mddev->curr_resync) | |
7350 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7351 | rcu_read_unlock(); |
5fd6c1dc | 7352 | } |
1da177e4 | 7353 | } |
17571284 | 7354 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7355 | |
1da177e4 | 7356 | skip: |
c07b70ad N |
7357 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7358 | /* We completed so min/max setting can be forgotten if used. */ | |
7359 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7360 | mddev->resync_min = 0; | |
7361 | mddev->resync_max = MaxSector; | |
7362 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7363 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7364 | mddev->curr_resync = 0; |
7365 | wake_up(&resync_wait); | |
7366 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7367 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
7368 | return; |
7369 | ||
7370 | interrupted: | |
7371 | /* | |
7372 | * got a signal, exit. | |
7373 | */ | |
7374 | printk(KERN_INFO | |
7375 | "md: md_do_sync() got signal ... exiting\n"); | |
7376 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7377 | goto out; | |
7378 | ||
1da177e4 | 7379 | } |
29269553 | 7380 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7381 | |
fd01b88c | 7382 | static int remove_and_add_spares(struct mddev *mddev) |
b4c4c7b8 | 7383 | { |
3cb03002 | 7384 | struct md_rdev *rdev; |
b4c4c7b8 N |
7385 | int spares = 0; |
7386 | ||
97e4f42d N |
7387 | mddev->curr_resync_completed = 0; |
7388 | ||
159ec1fc | 7389 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 7390 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 7391 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7392 | (test_bit(Faulty, &rdev->flags) || |
7393 | ! test_bit(In_sync, &rdev->flags)) && | |
7394 | atomic_read(&rdev->nr_pending)==0) { | |
7395 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7396 | mddev, rdev) == 0) { |
36fad858 | 7397 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 N |
7398 | rdev->raid_disk = -1; |
7399 | } | |
7400 | } | |
7401 | ||
5389042f | 7402 | if (mddev->degraded) { |
159ec1fc | 7403 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 7404 | if (rdev->raid_disk >= 0 && |
e5427135 | 7405 | !test_bit(In_sync, &rdev->flags) && |
de393cde | 7406 | !test_bit(Faulty, &rdev->flags)) |
dfc70645 | 7407 | spares++; |
b4c4c7b8 N |
7408 | if (rdev->raid_disk < 0 |
7409 | && !test_bit(Faulty, &rdev->flags)) { | |
7410 | rdev->recovery_offset = 0; | |
199050ea NB |
7411 | if (mddev->pers-> |
7412 | hot_add_disk(mddev, rdev) == 0) { | |
36fad858 | 7413 | if (sysfs_link_rdev(mddev, rdev)) |
00bcb4ac | 7414 | /* failure here is OK */; |
b4c4c7b8 N |
7415 | spares++; |
7416 | md_new_event(mddev); | |
93be75ff | 7417 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
60fc1370 | 7418 | } |
b4c4c7b8 | 7419 | } |
dfc70645 | 7420 | } |
b4c4c7b8 N |
7421 | } |
7422 | return spares; | |
7423 | } | |
7ebc0be7 | 7424 | |
fd01b88c | 7425 | static void reap_sync_thread(struct mddev *mddev) |
7ebc0be7 | 7426 | { |
3cb03002 | 7427 | struct md_rdev *rdev; |
7ebc0be7 N |
7428 | |
7429 | /* resync has finished, collect result */ | |
01f96c0a | 7430 | md_unregister_thread(&mddev->sync_thread); |
7ebc0be7 N |
7431 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
7432 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7433 | /* success...*/ | |
7434 | /* activate any spares */ | |
7435 | if (mddev->pers->spare_active(mddev)) | |
7436 | sysfs_notify(&mddev->kobj, NULL, | |
7437 | "degraded"); | |
7438 | } | |
7439 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7440 | mddev->pers->finish_reshape) | |
7441 | mddev->pers->finish_reshape(mddev); | |
7ebc0be7 | 7442 | |
d70ed2e4 AW |
7443 | /* If array is no-longer degraded, then any saved_raid_disk |
7444 | * information must be scrapped. Also if any device is now | |
7445 | * In_sync we must scrape the saved_raid_disk for that device | |
7446 | * do the superblock for an incrementally recovered device | |
7447 | * written out. | |
7ebc0be7 | 7448 | */ |
d70ed2e4 AW |
7449 | list_for_each_entry(rdev, &mddev->disks, same_set) |
7450 | if (!mddev->degraded || | |
7451 | test_bit(In_sync, &rdev->flags)) | |
7ebc0be7 N |
7452 | rdev->saved_raid_disk = -1; |
7453 | ||
d70ed2e4 | 7454 | md_update_sb(mddev, 1); |
7ebc0be7 N |
7455 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7456 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7457 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7458 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7459 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7460 | /* flag recovery needed just to double check */ | |
7461 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7462 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7463 | md_new_event(mddev); | |
768e587e JB |
7464 | if (mddev->event_work.func) |
7465 | queue_work(md_misc_wq, &mddev->event_work); | |
7ebc0be7 N |
7466 | } |
7467 | ||
1da177e4 LT |
7468 | /* |
7469 | * This routine is regularly called by all per-raid-array threads to | |
7470 | * deal with generic issues like resync and super-block update. | |
7471 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7472 | * need this as they never do any recovery or update the superblock. | |
7473 | * | |
7474 | * It does not do any resync itself, but rather "forks" off other threads | |
7475 | * to do that as needed. | |
7476 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7477 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7478 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7479 | * and wakeups up this thread which will reap the thread and finish up. |
7480 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7481 | * | |
7482 | * The overall approach is: | |
7483 | * 1/ if the superblock needs updating, update it. | |
7484 | * 2/ If a recovery thread is running, don't do anything else. | |
7485 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7486 | * 4/ If there are any faulty devices, remove them. | |
7487 | * 5/ If array is degraded, try to add spares devices | |
7488 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7489 | */ | |
fd01b88c | 7490 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 7491 | { |
68866e42 JB |
7492 | if (mddev->suspended) |
7493 | return; | |
7494 | ||
5f40402d | 7495 | if (mddev->bitmap) |
aa5cbd10 | 7496 | bitmap_daemon_work(mddev); |
1da177e4 | 7497 | |
fca4d848 | 7498 | if (signal_pending(current)) { |
31a59e34 | 7499 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7500 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7501 | mdname(mddev)); | |
7502 | mddev->safemode = 2; | |
7503 | } | |
7504 | flush_signals(current); | |
7505 | } | |
7506 | ||
c89a8eee N |
7507 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7508 | return; | |
1da177e4 | 7509 | if ( ! ( |
126925c0 | 7510 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7511 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7512 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7513 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7514 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7515 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7516 | )) |
7517 | return; | |
fca4d848 | 7518 | |
df5b89b3 | 7519 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7520 | int spares = 0; |
fca4d848 | 7521 | |
c89a8eee N |
7522 | if (mddev->ro) { |
7523 | /* Only thing we do on a ro array is remove | |
7524 | * failed devices. | |
7525 | */ | |
3cb03002 | 7526 | struct md_rdev *rdev; |
a8c42c7f N |
7527 | list_for_each_entry(rdev, &mddev->disks, same_set) |
7528 | if (rdev->raid_disk >= 0 && | |
7529 | !test_bit(Blocked, &rdev->flags) && | |
7530 | test_bit(Faulty, &rdev->flags) && | |
7531 | atomic_read(&rdev->nr_pending)==0) { | |
7532 | if (mddev->pers->hot_remove_disk( | |
b8321b68 | 7533 | mddev, rdev) == 0) { |
36fad858 | 7534 | sysfs_unlink_rdev(mddev, rdev); |
a8c42c7f N |
7535 | rdev->raid_disk = -1; |
7536 | } | |
7537 | } | |
c89a8eee N |
7538 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7539 | goto unlock; | |
7540 | } | |
7541 | ||
31a59e34 | 7542 | if (!mddev->external) { |
0fd62b86 | 7543 | int did_change = 0; |
31a59e34 N |
7544 | spin_lock_irq(&mddev->write_lock); |
7545 | if (mddev->safemode && | |
7546 | !atomic_read(&mddev->writes_pending) && | |
7547 | !mddev->in_sync && | |
7548 | mddev->recovery_cp == MaxSector) { | |
7549 | mddev->in_sync = 1; | |
0fd62b86 | 7550 | did_change = 1; |
070dc6dd | 7551 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7552 | } |
7553 | if (mddev->safemode == 1) | |
7554 | mddev->safemode = 0; | |
7555 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7556 | if (did_change) |
00bcb4ac | 7557 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7558 | } |
fca4d848 | 7559 | |
850b2b42 N |
7560 | if (mddev->flags) |
7561 | md_update_sb(mddev, 0); | |
06d91a5f | 7562 | |
1da177e4 LT |
7563 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7564 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7565 | /* resync/recovery still happening */ | |
7566 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7567 | goto unlock; | |
7568 | } | |
7569 | if (mddev->sync_thread) { | |
7ebc0be7 | 7570 | reap_sync_thread(mddev); |
1da177e4 LT |
7571 | goto unlock; |
7572 | } | |
72a23c21 NB |
7573 | /* Set RUNNING before clearing NEEDED to avoid |
7574 | * any transients in the value of "sync_action". | |
7575 | */ | |
7576 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7577 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7578 | /* Clear some bits that don't mean anything, but |
7579 | * might be left set | |
7580 | */ | |
24dd469d N |
7581 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7582 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7583 | |
5fd6c1dc N |
7584 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7585 | goto unlock; | |
1da177e4 LT |
7586 | /* no recovery is running. |
7587 | * remove any failed drives, then | |
7588 | * add spares if possible. | |
7589 | * Spare are also removed and re-added, to allow | |
7590 | * the personality to fail the re-add. | |
7591 | */ | |
1da177e4 | 7592 | |
b4c4c7b8 | 7593 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7594 | if (mddev->pers->check_reshape == NULL || |
7595 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7596 | /* Cannot proceed */ |
7597 | goto unlock; | |
7598 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7599 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7600 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7601 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7602 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7603 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7604 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7605 | } else if (mddev->recovery_cp < MaxSector) { |
7606 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7607 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7608 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7609 | /* nothing to be done ... */ | |
1da177e4 | 7610 | goto unlock; |
24dd469d | 7611 | |
1da177e4 | 7612 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7613 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7614 | /* We are adding a device or devices to an array | |
7615 | * which has the bitmap stored on all devices. | |
7616 | * So make sure all bitmap pages get written | |
7617 | */ | |
7618 | bitmap_write_all(mddev->bitmap); | |
7619 | } | |
1da177e4 LT |
7620 | mddev->sync_thread = md_register_thread(md_do_sync, |
7621 | mddev, | |
0da3c619 | 7622 | "resync"); |
1da177e4 LT |
7623 | if (!mddev->sync_thread) { |
7624 | printk(KERN_ERR "%s: could not start resync" | |
7625 | " thread...\n", | |
7626 | mdname(mddev)); | |
7627 | /* leave the spares where they are, it shouldn't hurt */ | |
7ebc0be7 N |
7628 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7629 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7630 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7631 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7632 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
d7603b7e | 7633 | } else |
1da177e4 | 7634 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7635 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7636 | md_new_event(mddev); |
1da177e4 LT |
7637 | } |
7638 | unlock: | |
72a23c21 NB |
7639 | if (!mddev->sync_thread) { |
7640 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7641 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7642 | &mddev->recovery)) | |
0c3573f1 | 7643 | if (mddev->sysfs_action) |
00bcb4ac | 7644 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7645 | } |
1da177e4 LT |
7646 | mddev_unlock(mddev); |
7647 | } | |
7648 | } | |
7649 | ||
fd01b88c | 7650 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 7651 | { |
00bcb4ac | 7652 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 7653 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
7654 | !test_bit(Blocked, &rdev->flags) && |
7655 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
7656 | msecs_to_jiffies(5000)); |
7657 | rdev_dec_pending(rdev, mddev); | |
7658 | } | |
7659 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7660 | ||
2230dfe4 N |
7661 | |
7662 | /* Bad block management. | |
7663 | * We can record which blocks on each device are 'bad' and so just | |
7664 | * fail those blocks, or that stripe, rather than the whole device. | |
7665 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7666 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7667 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7668 | * A 'shift' can be set so that larger blocks are tracked and | |
7669 | * consequently larger devices can be covered. | |
7670 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7671 | * | |
7672 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7673 | * might need to retry if it is very unlucky. | |
7674 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7675 | * so we use the write_seqlock_irq variant. | |
7676 | * | |
7677 | * When looking for a bad block we specify a range and want to | |
7678 | * know if any block in the range is bad. So we binary-search | |
7679 | * to the last range that starts at-or-before the given endpoint, | |
7680 | * (or "before the sector after the target range") | |
7681 | * then see if it ends after the given start. | |
7682 | * We return | |
7683 | * 0 if there are no known bad blocks in the range | |
7684 | * 1 if there are known bad block which are all acknowledged | |
7685 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
7686 | * plus the start/length of the first bad section we overlap. | |
7687 | */ | |
7688 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
7689 | sector_t *first_bad, int *bad_sectors) | |
7690 | { | |
7691 | int hi; | |
7692 | int lo = 0; | |
7693 | u64 *p = bb->page; | |
7694 | int rv = 0; | |
7695 | sector_t target = s + sectors; | |
7696 | unsigned seq; | |
7697 | ||
7698 | if (bb->shift > 0) { | |
7699 | /* round the start down, and the end up */ | |
7700 | s >>= bb->shift; | |
7701 | target += (1<<bb->shift) - 1; | |
7702 | target >>= bb->shift; | |
7703 | sectors = target - s; | |
7704 | } | |
7705 | /* 'target' is now the first block after the bad range */ | |
7706 | ||
7707 | retry: | |
7708 | seq = read_seqbegin(&bb->lock); | |
7709 | ||
7710 | hi = bb->count; | |
7711 | ||
7712 | /* Binary search between lo and hi for 'target' | |
7713 | * i.e. for the last range that starts before 'target' | |
7714 | */ | |
7715 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
7716 | * are known not to be the last range before target. | |
7717 | * VARIANT: hi-lo is the number of possible | |
7718 | * ranges, and decreases until it reaches 1 | |
7719 | */ | |
7720 | while (hi - lo > 1) { | |
7721 | int mid = (lo + hi) / 2; | |
7722 | sector_t a = BB_OFFSET(p[mid]); | |
7723 | if (a < target) | |
7724 | /* This could still be the one, earlier ranges | |
7725 | * could not. */ | |
7726 | lo = mid; | |
7727 | else | |
7728 | /* This and later ranges are definitely out. */ | |
7729 | hi = mid; | |
7730 | } | |
7731 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
7732 | if (hi > lo) { | |
7733 | /* need to check all range that end after 's' to see if | |
7734 | * any are unacknowledged. | |
7735 | */ | |
7736 | while (lo >= 0 && | |
7737 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7738 | if (BB_OFFSET(p[lo]) < target) { | |
7739 | /* starts before the end, and finishes after | |
7740 | * the start, so they must overlap | |
7741 | */ | |
7742 | if (rv != -1 && BB_ACK(p[lo])) | |
7743 | rv = 1; | |
7744 | else | |
7745 | rv = -1; | |
7746 | *first_bad = BB_OFFSET(p[lo]); | |
7747 | *bad_sectors = BB_LEN(p[lo]); | |
7748 | } | |
7749 | lo--; | |
7750 | } | |
7751 | } | |
7752 | ||
7753 | if (read_seqretry(&bb->lock, seq)) | |
7754 | goto retry; | |
7755 | ||
7756 | return rv; | |
7757 | } | |
7758 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
7759 | ||
7760 | /* | |
7761 | * Add a range of bad blocks to the table. | |
7762 | * This might extend the table, or might contract it | |
7763 | * if two adjacent ranges can be merged. | |
7764 | * We binary-search to find the 'insertion' point, then | |
7765 | * decide how best to handle it. | |
7766 | */ | |
7767 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
7768 | int acknowledged) | |
7769 | { | |
7770 | u64 *p; | |
7771 | int lo, hi; | |
7772 | int rv = 1; | |
7773 | ||
7774 | if (bb->shift < 0) | |
7775 | /* badblocks are disabled */ | |
7776 | return 0; | |
7777 | ||
7778 | if (bb->shift) { | |
7779 | /* round the start down, and the end up */ | |
7780 | sector_t next = s + sectors; | |
7781 | s >>= bb->shift; | |
7782 | next += (1<<bb->shift) - 1; | |
7783 | next >>= bb->shift; | |
7784 | sectors = next - s; | |
7785 | } | |
7786 | ||
7787 | write_seqlock_irq(&bb->lock); | |
7788 | ||
7789 | p = bb->page; | |
7790 | lo = 0; | |
7791 | hi = bb->count; | |
7792 | /* Find the last range that starts at-or-before 's' */ | |
7793 | while (hi - lo > 1) { | |
7794 | int mid = (lo + hi) / 2; | |
7795 | sector_t a = BB_OFFSET(p[mid]); | |
7796 | if (a <= s) | |
7797 | lo = mid; | |
7798 | else | |
7799 | hi = mid; | |
7800 | } | |
7801 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
7802 | hi = lo; | |
7803 | ||
7804 | if (hi > lo) { | |
7805 | /* we found a range that might merge with the start | |
7806 | * of our new range | |
7807 | */ | |
7808 | sector_t a = BB_OFFSET(p[lo]); | |
7809 | sector_t e = a + BB_LEN(p[lo]); | |
7810 | int ack = BB_ACK(p[lo]); | |
7811 | if (e >= s) { | |
7812 | /* Yes, we can merge with a previous range */ | |
7813 | if (s == a && s + sectors >= e) | |
7814 | /* new range covers old */ | |
7815 | ack = acknowledged; | |
7816 | else | |
7817 | ack = ack && acknowledged; | |
7818 | ||
7819 | if (e < s + sectors) | |
7820 | e = s + sectors; | |
7821 | if (e - a <= BB_MAX_LEN) { | |
7822 | p[lo] = BB_MAKE(a, e-a, ack); | |
7823 | s = e; | |
7824 | } else { | |
7825 | /* does not all fit in one range, | |
7826 | * make p[lo] maximal | |
7827 | */ | |
7828 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
7829 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
7830 | s = a + BB_MAX_LEN; | |
7831 | } | |
7832 | sectors = e - s; | |
7833 | } | |
7834 | } | |
7835 | if (sectors && hi < bb->count) { | |
7836 | /* 'hi' points to the first range that starts after 's'. | |
7837 | * Maybe we can merge with the start of that range */ | |
7838 | sector_t a = BB_OFFSET(p[hi]); | |
7839 | sector_t e = a + BB_LEN(p[hi]); | |
7840 | int ack = BB_ACK(p[hi]); | |
7841 | if (a <= s + sectors) { | |
7842 | /* merging is possible */ | |
7843 | if (e <= s + sectors) { | |
7844 | /* full overlap */ | |
7845 | e = s + sectors; | |
7846 | ack = acknowledged; | |
7847 | } else | |
7848 | ack = ack && acknowledged; | |
7849 | ||
7850 | a = s; | |
7851 | if (e - a <= BB_MAX_LEN) { | |
7852 | p[hi] = BB_MAKE(a, e-a, ack); | |
7853 | s = e; | |
7854 | } else { | |
7855 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
7856 | s = a + BB_MAX_LEN; | |
7857 | } | |
7858 | sectors = e - s; | |
7859 | lo = hi; | |
7860 | hi++; | |
7861 | } | |
7862 | } | |
7863 | if (sectors == 0 && hi < bb->count) { | |
7864 | /* we might be able to combine lo and hi */ | |
7865 | /* Note: 's' is at the end of 'lo' */ | |
7866 | sector_t a = BB_OFFSET(p[hi]); | |
7867 | int lolen = BB_LEN(p[lo]); | |
7868 | int hilen = BB_LEN(p[hi]); | |
7869 | int newlen = lolen + hilen - (s - a); | |
7870 | if (s >= a && newlen < BB_MAX_LEN) { | |
7871 | /* yes, we can combine them */ | |
7872 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
7873 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
7874 | memmove(p + hi, p + hi + 1, | |
7875 | (bb->count - hi - 1) * 8); | |
7876 | bb->count--; | |
7877 | } | |
7878 | } | |
7879 | while (sectors) { | |
7880 | /* didn't merge (it all). | |
7881 | * Need to add a range just before 'hi' */ | |
7882 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
7883 | /* No room for more */ | |
7884 | rv = 0; | |
7885 | break; | |
7886 | } else { | |
7887 | int this_sectors = sectors; | |
7888 | memmove(p + hi + 1, p + hi, | |
7889 | (bb->count - hi) * 8); | |
7890 | bb->count++; | |
7891 | ||
7892 | if (this_sectors > BB_MAX_LEN) | |
7893 | this_sectors = BB_MAX_LEN; | |
7894 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
7895 | sectors -= this_sectors; | |
7896 | s += this_sectors; | |
7897 | } | |
7898 | } | |
7899 | ||
7900 | bb->changed = 1; | |
de393cde N |
7901 | if (!acknowledged) |
7902 | bb->unacked_exist = 1; | |
2230dfe4 N |
7903 | write_sequnlock_irq(&bb->lock); |
7904 | ||
7905 | return rv; | |
7906 | } | |
7907 | ||
3cb03002 | 7908 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
2230dfe4 N |
7909 | int acknowledged) |
7910 | { | |
7911 | int rv = md_set_badblocks(&rdev->badblocks, | |
7912 | s + rdev->data_offset, sectors, acknowledged); | |
7913 | if (rv) { | |
7914 | /* Make sure they get written out promptly */ | |
8bd2f0a0 | 7915 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
2230dfe4 N |
7916 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); |
7917 | md_wakeup_thread(rdev->mddev->thread); | |
7918 | } | |
7919 | return rv; | |
7920 | } | |
7921 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
7922 | ||
7923 | /* | |
7924 | * Remove a range of bad blocks from the table. | |
7925 | * This may involve extending the table if we spilt a region, | |
7926 | * but it must not fail. So if the table becomes full, we just | |
7927 | * drop the remove request. | |
7928 | */ | |
7929 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
7930 | { | |
7931 | u64 *p; | |
7932 | int lo, hi; | |
7933 | sector_t target = s + sectors; | |
7934 | int rv = 0; | |
7935 | ||
7936 | if (bb->shift > 0) { | |
7937 | /* When clearing we round the start up and the end down. | |
7938 | * This should not matter as the shift should align with | |
7939 | * the block size and no rounding should ever be needed. | |
7940 | * However it is better the think a block is bad when it | |
7941 | * isn't than to think a block is not bad when it is. | |
7942 | */ | |
7943 | s += (1<<bb->shift) - 1; | |
7944 | s >>= bb->shift; | |
7945 | target >>= bb->shift; | |
7946 | sectors = target - s; | |
7947 | } | |
7948 | ||
7949 | write_seqlock_irq(&bb->lock); | |
7950 | ||
7951 | p = bb->page; | |
7952 | lo = 0; | |
7953 | hi = bb->count; | |
7954 | /* Find the last range that starts before 'target' */ | |
7955 | while (hi - lo > 1) { | |
7956 | int mid = (lo + hi) / 2; | |
7957 | sector_t a = BB_OFFSET(p[mid]); | |
7958 | if (a < target) | |
7959 | lo = mid; | |
7960 | else | |
7961 | hi = mid; | |
7962 | } | |
7963 | if (hi > lo) { | |
7964 | /* p[lo] is the last range that could overlap the | |
7965 | * current range. Earlier ranges could also overlap, | |
7966 | * but only this one can overlap the end of the range. | |
7967 | */ | |
7968 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
7969 | /* Partial overlap, leave the tail of this range */ | |
7970 | int ack = BB_ACK(p[lo]); | |
7971 | sector_t a = BB_OFFSET(p[lo]); | |
7972 | sector_t end = a + BB_LEN(p[lo]); | |
7973 | ||
7974 | if (a < s) { | |
7975 | /* we need to split this range */ | |
7976 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
7977 | rv = 0; | |
7978 | goto out; | |
7979 | } | |
7980 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
7981 | bb->count++; | |
7982 | p[lo] = BB_MAKE(a, s-a, ack); | |
7983 | lo++; | |
7984 | } | |
7985 | p[lo] = BB_MAKE(target, end - target, ack); | |
7986 | /* there is no longer an overlap */ | |
7987 | hi = lo; | |
7988 | lo--; | |
7989 | } | |
7990 | while (lo >= 0 && | |
7991 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7992 | /* This range does overlap */ | |
7993 | if (BB_OFFSET(p[lo]) < s) { | |
7994 | /* Keep the early parts of this range. */ | |
7995 | int ack = BB_ACK(p[lo]); | |
7996 | sector_t start = BB_OFFSET(p[lo]); | |
7997 | p[lo] = BB_MAKE(start, s - start, ack); | |
7998 | /* now low doesn't overlap, so.. */ | |
7999 | break; | |
8000 | } | |
8001 | lo--; | |
8002 | } | |
8003 | /* 'lo' is strictly before, 'hi' is strictly after, | |
8004 | * anything between needs to be discarded | |
8005 | */ | |
8006 | if (hi - lo > 1) { | |
8007 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
8008 | bb->count -= (hi - lo - 1); | |
8009 | } | |
8010 | } | |
8011 | ||
8012 | bb->changed = 1; | |
8013 | out: | |
8014 | write_sequnlock_irq(&bb->lock); | |
8015 | return rv; | |
8016 | } | |
8017 | ||
3cb03002 | 8018 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors) |
2230dfe4 N |
8019 | { |
8020 | return md_clear_badblocks(&rdev->badblocks, | |
8021 | s + rdev->data_offset, | |
8022 | sectors); | |
8023 | } | |
8024 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
8025 | ||
8026 | /* | |
8027 | * Acknowledge all bad blocks in a list. | |
8028 | * This only succeeds if ->changed is clear. It is used by | |
8029 | * in-kernel metadata updates | |
8030 | */ | |
8031 | void md_ack_all_badblocks(struct badblocks *bb) | |
8032 | { | |
8033 | if (bb->page == NULL || bb->changed) | |
8034 | /* no point even trying */ | |
8035 | return; | |
8036 | write_seqlock_irq(&bb->lock); | |
8037 | ||
8038 | if (bb->changed == 0) { | |
8039 | u64 *p = bb->page; | |
8040 | int i; | |
8041 | for (i = 0; i < bb->count ; i++) { | |
8042 | if (!BB_ACK(p[i])) { | |
8043 | sector_t start = BB_OFFSET(p[i]); | |
8044 | int len = BB_LEN(p[i]); | |
8045 | p[i] = BB_MAKE(start, len, 1); | |
8046 | } | |
8047 | } | |
de393cde | 8048 | bb->unacked_exist = 0; |
2230dfe4 N |
8049 | } |
8050 | write_sequnlock_irq(&bb->lock); | |
8051 | } | |
8052 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
8053 | ||
16c791a5 N |
8054 | /* sysfs access to bad-blocks list. |
8055 | * We present two files. | |
8056 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
8057 | * are recorded as bad. The list is truncated to fit within | |
8058 | * the one-page limit of sysfs. | |
8059 | * Writing "sector length" to this file adds an acknowledged | |
8060 | * bad block list. | |
8061 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
8062 | * been acknowledged. Writing to this file adds bad blocks | |
8063 | * without acknowledging them. This is largely for testing. | |
8064 | */ | |
8065 | ||
8066 | static ssize_t | |
8067 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
8068 | { | |
8069 | size_t len; | |
8070 | int i; | |
8071 | u64 *p = bb->page; | |
8072 | unsigned seq; | |
8073 | ||
8074 | if (bb->shift < 0) | |
8075 | return 0; | |
8076 | ||
8077 | retry: | |
8078 | seq = read_seqbegin(&bb->lock); | |
8079 | ||
8080 | len = 0; | |
8081 | i = 0; | |
8082 | ||
8083 | while (len < PAGE_SIZE && i < bb->count) { | |
8084 | sector_t s = BB_OFFSET(p[i]); | |
8085 | unsigned int length = BB_LEN(p[i]); | |
8086 | int ack = BB_ACK(p[i]); | |
8087 | i++; | |
8088 | ||
8089 | if (unack && ack) | |
8090 | continue; | |
8091 | ||
8092 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8093 | (unsigned long long)s << bb->shift, | |
8094 | length << bb->shift); | |
8095 | } | |
de393cde N |
8096 | if (unack && len == 0) |
8097 | bb->unacked_exist = 0; | |
16c791a5 N |
8098 | |
8099 | if (read_seqretry(&bb->lock, seq)) | |
8100 | goto retry; | |
8101 | ||
8102 | return len; | |
8103 | } | |
8104 | ||
8105 | #define DO_DEBUG 1 | |
8106 | ||
8107 | static ssize_t | |
8108 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8109 | { | |
8110 | unsigned long long sector; | |
8111 | int length; | |
8112 | char newline; | |
8113 | #ifdef DO_DEBUG | |
8114 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8115 | * Normally only a successful write may clear a badblock | |
8116 | */ | |
8117 | int clear = 0; | |
8118 | if (page[0] == '-') { | |
8119 | clear = 1; | |
8120 | page++; | |
8121 | } | |
8122 | #endif /* DO_DEBUG */ | |
8123 | ||
8124 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8125 | case 3: | |
8126 | if (newline != '\n') | |
8127 | return -EINVAL; | |
8128 | case 2: | |
8129 | if (length <= 0) | |
8130 | return -EINVAL; | |
8131 | break; | |
8132 | default: | |
8133 | return -EINVAL; | |
8134 | } | |
8135 | ||
8136 | #ifdef DO_DEBUG | |
8137 | if (clear) { | |
8138 | md_clear_badblocks(bb, sector, length); | |
8139 | return len; | |
8140 | } | |
8141 | #endif /* DO_DEBUG */ | |
8142 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8143 | return len; | |
8144 | else | |
8145 | return -ENOSPC; | |
8146 | } | |
8147 | ||
75c96f85 AB |
8148 | static int md_notify_reboot(struct notifier_block *this, |
8149 | unsigned long code, void *x) | |
1da177e4 LT |
8150 | { |
8151 | struct list_head *tmp; | |
fd01b88c | 8152 | struct mddev *mddev; |
2dba6a91 | 8153 | int need_delay = 0; |
1da177e4 LT |
8154 | |
8155 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
8156 | ||
8157 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
8158 | ||
2dba6a91 | 8159 | for_each_mddev(mddev, tmp) { |
c71d4887 | 8160 | if (mddev_trylock(mddev)) { |
2b25000b N |
8161 | /* Force a switch to readonly even array |
8162 | * appears to still be in use. Hence | |
8163 | * the '100'. | |
8164 | */ | |
a4bd82d0 | 8165 | md_set_readonly(mddev, 100); |
c71d4887 NB |
8166 | mddev_unlock(mddev); |
8167 | } | |
2dba6a91 DB |
8168 | need_delay = 1; |
8169 | } | |
1da177e4 LT |
8170 | /* |
8171 | * certain more exotic SCSI devices are known to be | |
8172 | * volatile wrt too early system reboots. While the | |
8173 | * right place to handle this issue is the given | |
8174 | * driver, we do want to have a safe RAID driver ... | |
8175 | */ | |
2dba6a91 DB |
8176 | if (need_delay) |
8177 | mdelay(1000*1); | |
1da177e4 LT |
8178 | } |
8179 | return NOTIFY_DONE; | |
8180 | } | |
8181 | ||
75c96f85 | 8182 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8183 | .notifier_call = md_notify_reboot, |
8184 | .next = NULL, | |
8185 | .priority = INT_MAX, /* before any real devices */ | |
8186 | }; | |
8187 | ||
8188 | static void md_geninit(void) | |
8189 | { | |
36a4e1fe | 8190 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8191 | |
c7705f34 | 8192 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8193 | } |
8194 | ||
75c96f85 | 8195 | static int __init md_init(void) |
1da177e4 | 8196 | { |
e804ac78 TH |
8197 | int ret = -ENOMEM; |
8198 | ||
ada609ee | 8199 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8200 | if (!md_wq) |
8201 | goto err_wq; | |
8202 | ||
8203 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8204 | if (!md_misc_wq) | |
8205 | goto err_misc_wq; | |
8206 | ||
8207 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8208 | goto err_md; | |
8209 | ||
8210 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8211 | goto err_mdp; | |
8212 | mdp_major = ret; | |
8213 | ||
3dbd8c2e | 8214 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
8215 | md_probe, NULL, NULL); |
8216 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8217 | md_probe, NULL, NULL); |
8218 | ||
1da177e4 | 8219 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8220 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8221 | |
8222 | md_geninit(); | |
d710e138 | 8223 | return 0; |
1da177e4 | 8224 | |
e804ac78 TH |
8225 | err_mdp: |
8226 | unregister_blkdev(MD_MAJOR, "md"); | |
8227 | err_md: | |
8228 | destroy_workqueue(md_misc_wq); | |
8229 | err_misc_wq: | |
8230 | destroy_workqueue(md_wq); | |
8231 | err_wq: | |
8232 | return ret; | |
8233 | } | |
1da177e4 LT |
8234 | |
8235 | #ifndef MODULE | |
8236 | ||
8237 | /* | |
8238 | * Searches all registered partitions for autorun RAID arrays | |
8239 | * at boot time. | |
8240 | */ | |
4d936ec1 ME |
8241 | |
8242 | static LIST_HEAD(all_detected_devices); | |
8243 | struct detected_devices_node { | |
8244 | struct list_head list; | |
8245 | dev_t dev; | |
8246 | }; | |
1da177e4 LT |
8247 | |
8248 | void md_autodetect_dev(dev_t dev) | |
8249 | { | |
4d936ec1 ME |
8250 | struct detected_devices_node *node_detected_dev; |
8251 | ||
8252 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8253 | if (node_detected_dev) { | |
8254 | node_detected_dev->dev = dev; | |
8255 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8256 | } else { | |
8257 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8258 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8259 | } | |
1da177e4 LT |
8260 | } |
8261 | ||
8262 | ||
8263 | static void autostart_arrays(int part) | |
8264 | { | |
3cb03002 | 8265 | struct md_rdev *rdev; |
4d936ec1 ME |
8266 | struct detected_devices_node *node_detected_dev; |
8267 | dev_t dev; | |
8268 | int i_scanned, i_passed; | |
1da177e4 | 8269 | |
4d936ec1 ME |
8270 | i_scanned = 0; |
8271 | i_passed = 0; | |
1da177e4 | 8272 | |
4d936ec1 | 8273 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8274 | |
4d936ec1 ME |
8275 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8276 | i_scanned++; | |
8277 | node_detected_dev = list_entry(all_detected_devices.next, | |
8278 | struct detected_devices_node, list); | |
8279 | list_del(&node_detected_dev->list); | |
8280 | dev = node_detected_dev->dev; | |
8281 | kfree(node_detected_dev); | |
df968c4e | 8282 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8283 | if (IS_ERR(rdev)) |
8284 | continue; | |
8285 | ||
b2d444d7 | 8286 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
8287 | MD_BUG(); |
8288 | continue; | |
8289 | } | |
d0fae18f | 8290 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8291 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8292 | i_passed++; |
1da177e4 | 8293 | } |
4d936ec1 ME |
8294 | |
8295 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8296 | i_scanned, i_passed); | |
1da177e4 LT |
8297 | |
8298 | autorun_devices(part); | |
8299 | } | |
8300 | ||
fdee8ae4 | 8301 | #endif /* !MODULE */ |
1da177e4 LT |
8302 | |
8303 | static __exit void md_exit(void) | |
8304 | { | |
fd01b88c | 8305 | struct mddev *mddev; |
1da177e4 | 8306 | struct list_head *tmp; |
8ab5e4c1 | 8307 | |
3dbd8c2e | 8308 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 8309 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8310 | |
3dbd8c2e | 8311 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8312 | unregister_blkdev(mdp_major, "mdp"); |
8313 | unregister_reboot_notifier(&md_notifier); | |
8314 | unregister_sysctl_table(raid_table_header); | |
8315 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 8316 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8317 | export_array(mddev); |
d3374825 | 8318 | mddev->hold_active = 0; |
1da177e4 | 8319 | } |
e804ac78 TH |
8320 | destroy_workqueue(md_misc_wq); |
8321 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8322 | } |
8323 | ||
685784aa | 8324 | subsys_initcall(md_init); |
1da177e4 LT |
8325 | module_exit(md_exit) |
8326 | ||
f91de92e N |
8327 | static int get_ro(char *buffer, struct kernel_param *kp) |
8328 | { | |
8329 | return sprintf(buffer, "%d", start_readonly); | |
8330 | } | |
8331 | static int set_ro(const char *val, struct kernel_param *kp) | |
8332 | { | |
8333 | char *e; | |
8334 | int num = simple_strtoul(val, &e, 10); | |
8335 | if (*val && (*e == '\0' || *e == '\n')) { | |
8336 | start_readonly = num; | |
4dbcdc75 | 8337 | return 0; |
f91de92e N |
8338 | } |
8339 | return -EINVAL; | |
8340 | } | |
8341 | ||
80ca3a44 N |
8342 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8343 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 8344 | |
efeb53c0 | 8345 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8346 | |
1da177e4 LT |
8347 | EXPORT_SYMBOL(register_md_personality); |
8348 | EXPORT_SYMBOL(unregister_md_personality); | |
8349 | EXPORT_SYMBOL(md_error); | |
8350 | EXPORT_SYMBOL(md_done_sync); | |
8351 | EXPORT_SYMBOL(md_write_start); | |
8352 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
8353 | EXPORT_SYMBOL(md_register_thread); |
8354 | EXPORT_SYMBOL(md_unregister_thread); | |
8355 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
8356 | EXPORT_SYMBOL(md_check_recovery); |
8357 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8358 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8359 | MODULE_ALIAS("md"); |
72008652 | 8360 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |