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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
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> | |
47 | #include <linux/reboot.h> | |
32a7627c | 48 | #include <linux/file.h> |
aa98aa31 | 49 | #include <linux/compat.h> |
25570727 | 50 | #include <linux/delay.h> |
bff61975 N |
51 | #include <linux/raid/md_p.h> |
52 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 53 | #include <linux/slab.h> |
43b2e5d8 | 54 | #include "md.h" |
ef740c37 | 55 | #include "bitmap.h" |
1da177e4 | 56 | |
1da177e4 | 57 | #ifndef MODULE |
d710e138 | 58 | static void autostart_arrays(int part); |
1da177e4 LT |
59 | #endif |
60 | ||
01f96c0a N |
61 | /* pers_list is a list of registered personalities protected |
62 | * by pers_lock. | |
63 | * pers_lock does extra service to protect accesses to | |
64 | * mddev->thread when the mutex cannot be held. | |
65 | */ | |
2604b703 | 66 | static LIST_HEAD(pers_list); |
1da177e4 LT |
67 | static DEFINE_SPINLOCK(pers_lock); |
68 | ||
5e56341d AB |
69 | static void md_print_devices(void); |
70 | ||
90b08710 | 71 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
72 | static struct workqueue_struct *md_wq; |
73 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 74 | |
5e56341d AB |
75 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
76 | ||
1e50915f RB |
77 | /* |
78 | * Default number of read corrections we'll attempt on an rdev | |
79 | * before ejecting it from the array. We divide the read error | |
80 | * count by 2 for every hour elapsed between read errors. | |
81 | */ | |
82 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
83 | /* |
84 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
85 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
86 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 87 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
88 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
89 | * speed limit - in case reconstruction slows down your system despite | |
90 | * idle IO detection. | |
91 | * | |
92 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 93 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
94 | */ |
95 | ||
96 | static int sysctl_speed_limit_min = 1000; | |
97 | static int sysctl_speed_limit_max = 200000; | |
fd01b88c | 98 | static inline int speed_min(struct mddev *mddev) |
88202a0c N |
99 | { |
100 | return mddev->sync_speed_min ? | |
101 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
102 | } | |
103 | ||
fd01b88c | 104 | static inline int speed_max(struct mddev *mddev) |
88202a0c N |
105 | { |
106 | return mddev->sync_speed_max ? | |
107 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
108 | } | |
1da177e4 LT |
109 | |
110 | static struct ctl_table_header *raid_table_header; | |
111 | ||
112 | static ctl_table raid_table[] = { | |
113 | { | |
1da177e4 LT |
114 | .procname = "speed_limit_min", |
115 | .data = &sysctl_speed_limit_min, | |
116 | .maxlen = sizeof(int), | |
80ca3a44 | 117 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 118 | .proc_handler = proc_dointvec, |
1da177e4 LT |
119 | }, |
120 | { | |
1da177e4 LT |
121 | .procname = "speed_limit_max", |
122 | .data = &sysctl_speed_limit_max, | |
123 | .maxlen = sizeof(int), | |
80ca3a44 | 124 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 125 | .proc_handler = proc_dointvec, |
1da177e4 | 126 | }, |
894d2491 | 127 | { } |
1da177e4 LT |
128 | }; |
129 | ||
130 | static ctl_table raid_dir_table[] = { | |
131 | { | |
1da177e4 LT |
132 | .procname = "raid", |
133 | .maxlen = 0, | |
80ca3a44 | 134 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
135 | .child = raid_table, |
136 | }, | |
894d2491 | 137 | { } |
1da177e4 LT |
138 | }; |
139 | ||
140 | static ctl_table raid_root_table[] = { | |
141 | { | |
1da177e4 LT |
142 | .procname = "dev", |
143 | .maxlen = 0, | |
144 | .mode = 0555, | |
145 | .child = raid_dir_table, | |
146 | }, | |
894d2491 | 147 | { } |
1da177e4 LT |
148 | }; |
149 | ||
83d5cde4 | 150 | static const struct block_device_operations md_fops; |
1da177e4 | 151 | |
f91de92e N |
152 | static int start_readonly; |
153 | ||
a167f663 N |
154 | /* bio_clone_mddev |
155 | * like bio_clone, but with a local bio set | |
156 | */ | |
157 | ||
158 | static void mddev_bio_destructor(struct bio *bio) | |
159 | { | |
fd01b88c | 160 | struct mddev *mddev, **mddevp; |
a167f663 N |
161 | |
162 | mddevp = (void*)bio; | |
163 | mddev = mddevp[-1]; | |
164 | ||
165 | bio_free(bio, mddev->bio_set); | |
166 | } | |
167 | ||
168 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, | |
fd01b88c | 169 | struct mddev *mddev) |
a167f663 N |
170 | { |
171 | struct bio *b; | |
fd01b88c | 172 | struct mddev **mddevp; |
a167f663 N |
173 | |
174 | if (!mddev || !mddev->bio_set) | |
175 | return bio_alloc(gfp_mask, nr_iovecs); | |
176 | ||
177 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, | |
178 | mddev->bio_set); | |
179 | if (!b) | |
180 | return NULL; | |
181 | mddevp = (void*)b; | |
182 | mddevp[-1] = mddev; | |
183 | b->bi_destructor = mddev_bio_destructor; | |
184 | return b; | |
185 | } | |
186 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
187 | ||
188 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
fd01b88c | 189 | struct mddev *mddev) |
a167f663 N |
190 | { |
191 | struct bio *b; | |
fd01b88c | 192 | struct mddev **mddevp; |
a167f663 N |
193 | |
194 | if (!mddev || !mddev->bio_set) | |
195 | return bio_clone(bio, gfp_mask); | |
196 | ||
197 | b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, | |
198 | mddev->bio_set); | |
199 | if (!b) | |
200 | return NULL; | |
201 | mddevp = (void*)b; | |
202 | mddevp[-1] = mddev; | |
203 | b->bi_destructor = mddev_bio_destructor; | |
204 | __bio_clone(b, bio); | |
205 | if (bio_integrity(bio)) { | |
206 | int ret; | |
207 | ||
208 | ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set); | |
209 | ||
210 | if (ret < 0) { | |
211 | bio_put(b); | |
212 | return NULL; | |
213 | } | |
214 | } | |
215 | ||
216 | return b; | |
217 | } | |
218 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
219 | ||
d2eb35ac N |
220 | void md_trim_bio(struct bio *bio, int offset, int size) |
221 | { | |
222 | /* 'bio' is a cloned bio which we need to trim to match | |
223 | * the given offset and size. | |
224 | * This requires adjusting bi_sector, bi_size, and bi_io_vec | |
225 | */ | |
226 | int i; | |
227 | struct bio_vec *bvec; | |
228 | int sofar = 0; | |
229 | ||
230 | size <<= 9; | |
231 | if (offset == 0 && size == bio->bi_size) | |
232 | return; | |
233 | ||
234 | bio->bi_sector += offset; | |
235 | bio->bi_size = size; | |
236 | offset <<= 9; | |
237 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
238 | ||
239 | while (bio->bi_idx < bio->bi_vcnt && | |
240 | bio->bi_io_vec[bio->bi_idx].bv_len <= offset) { | |
241 | /* remove this whole bio_vec */ | |
242 | offset -= bio->bi_io_vec[bio->bi_idx].bv_len; | |
243 | bio->bi_idx++; | |
244 | } | |
245 | if (bio->bi_idx < bio->bi_vcnt) { | |
246 | bio->bi_io_vec[bio->bi_idx].bv_offset += offset; | |
247 | bio->bi_io_vec[bio->bi_idx].bv_len -= offset; | |
248 | } | |
249 | /* avoid any complications with bi_idx being non-zero*/ | |
250 | if (bio->bi_idx) { | |
251 | memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx, | |
252 | (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec)); | |
253 | bio->bi_vcnt -= bio->bi_idx; | |
254 | bio->bi_idx = 0; | |
255 | } | |
256 | /* Make sure vcnt and last bv are not too big */ | |
257 | bio_for_each_segment(bvec, bio, i) { | |
258 | if (sofar + bvec->bv_len > size) | |
259 | bvec->bv_len = size - sofar; | |
260 | if (bvec->bv_len == 0) { | |
261 | bio->bi_vcnt = i; | |
262 | break; | |
263 | } | |
264 | sofar += bvec->bv_len; | |
265 | } | |
266 | } | |
267 | EXPORT_SYMBOL_GPL(md_trim_bio); | |
268 | ||
d7603b7e N |
269 | /* |
270 | * We have a system wide 'event count' that is incremented | |
271 | * on any 'interesting' event, and readers of /proc/mdstat | |
272 | * can use 'poll' or 'select' to find out when the event | |
273 | * count increases. | |
274 | * | |
275 | * Events are: | |
276 | * start array, stop array, error, add device, remove device, | |
277 | * start build, activate spare | |
278 | */ | |
2989ddbd | 279 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 280 | static atomic_t md_event_count; |
fd01b88c | 281 | void md_new_event(struct mddev *mddev) |
d7603b7e N |
282 | { |
283 | atomic_inc(&md_event_count); | |
284 | wake_up(&md_event_waiters); | |
285 | } | |
29269553 | 286 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 287 | |
c331eb04 N |
288 | /* Alternate version that can be called from interrupts |
289 | * when calling sysfs_notify isn't needed. | |
290 | */ | |
fd01b88c | 291 | static void md_new_event_inintr(struct mddev *mddev) |
c331eb04 N |
292 | { |
293 | atomic_inc(&md_event_count); | |
294 | wake_up(&md_event_waiters); | |
295 | } | |
296 | ||
1da177e4 LT |
297 | /* |
298 | * Enables to iterate over all existing md arrays | |
299 | * all_mddevs_lock protects this list. | |
300 | */ | |
301 | static LIST_HEAD(all_mddevs); | |
302 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
303 | ||
304 | ||
305 | /* | |
306 | * iterates through all used mddevs in the system. | |
307 | * We take care to grab the all_mddevs_lock whenever navigating | |
308 | * the list, and to always hold a refcount when unlocked. | |
309 | * Any code which breaks out of this loop while own | |
310 | * a reference to the current mddev and must mddev_put it. | |
311 | */ | |
fd01b88c | 312 | #define for_each_mddev(_mddev,_tmp) \ |
1da177e4 LT |
313 | \ |
314 | for (({ spin_lock(&all_mddevs_lock); \ | |
fd01b88c N |
315 | _tmp = all_mddevs.next; \ |
316 | _mddev = NULL;}); \ | |
317 | ({ if (_tmp != &all_mddevs) \ | |
318 | mddev_get(list_entry(_tmp, struct mddev, all_mddevs));\ | |
1da177e4 | 319 | spin_unlock(&all_mddevs_lock); \ |
fd01b88c N |
320 | if (_mddev) mddev_put(_mddev); \ |
321 | _mddev = list_entry(_tmp, struct mddev, all_mddevs); \ | |
322 | _tmp != &all_mddevs;}); \ | |
1da177e4 | 323 | ({ spin_lock(&all_mddevs_lock); \ |
fd01b88c | 324 | _tmp = _tmp->next;}) \ |
1da177e4 LT |
325 | ) |
326 | ||
327 | ||
409c57f3 N |
328 | /* Rather than calling directly into the personality make_request function, |
329 | * IO requests come here first so that we can check if the device is | |
330 | * being suspended pending a reconfiguration. | |
331 | * We hold a refcount over the call to ->make_request. By the time that | |
332 | * call has finished, the bio has been linked into some internal structure | |
333 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
334 | */ | |
335 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 336 | { |
49077326 | 337 | const int rw = bio_data_dir(bio); |
fd01b88c | 338 | struct mddev *mddev = q->queuedata; |
409c57f3 | 339 | int rv; |
49077326 | 340 | int cpu; |
e91ece55 | 341 | unsigned int sectors; |
49077326 | 342 | |
0ca69886 N |
343 | if (mddev == NULL || mddev->pers == NULL |
344 | || !mddev->ready) { | |
409c57f3 N |
345 | bio_io_error(bio); |
346 | return 0; | |
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); | |
21a52c6d | 371 | rv = 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); | |
380 | ||
381 | return rv; | |
382 | } | |
383 | ||
9e35b99c N |
384 | /* mddev_suspend makes sure no new requests are submitted |
385 | * to the device, and that any requests that have been submitted | |
386 | * are completely handled. | |
387 | * Once ->stop is called and completes, the module will be completely | |
388 | * unused. | |
389 | */ | |
fd01b88c | 390 | void mddev_suspend(struct mddev *mddev) |
409c57f3 N |
391 | { |
392 | BUG_ON(mddev->suspended); | |
393 | mddev->suspended = 1; | |
394 | synchronize_rcu(); | |
395 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
396 | mddev->pers->quiesce(mddev, 1); | |
409c57f3 | 397 | } |
390ee602 | 398 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 399 | |
fd01b88c | 400 | void mddev_resume(struct mddev *mddev) |
409c57f3 N |
401 | { |
402 | mddev->suspended = 0; | |
403 | wake_up(&mddev->sb_wait); | |
404 | mddev->pers->quiesce(mddev, 0); | |
0fd018af JB |
405 | |
406 | md_wakeup_thread(mddev->thread); | |
407 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 408 | } |
390ee602 | 409 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 410 | |
fd01b88c | 411 | int mddev_congested(struct mddev *mddev, int bits) |
3fa841d7 N |
412 | { |
413 | return mddev->suspended; | |
414 | } | |
415 | EXPORT_SYMBOL(mddev_congested); | |
416 | ||
a2826aa9 | 417 | /* |
e9c7469b | 418 | * Generic flush handling for md |
a2826aa9 N |
419 | */ |
420 | ||
e9c7469b | 421 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 | 422 | { |
3cb03002 | 423 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 424 | struct mddev *mddev = rdev->mddev; |
a2826aa9 N |
425 | |
426 | rdev_dec_pending(rdev, mddev); | |
427 | ||
428 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 429 | /* The pre-request flush has finished */ |
e804ac78 | 430 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
431 | } |
432 | bio_put(bio); | |
433 | } | |
434 | ||
a7a07e69 N |
435 | static void md_submit_flush_data(struct work_struct *ws); |
436 | ||
a035fc3e | 437 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 438 | { |
fd01b88c | 439 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
3cb03002 | 440 | struct md_rdev *rdev; |
a2826aa9 | 441 | |
a7a07e69 N |
442 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
443 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 N |
444 | rcu_read_lock(); |
445 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
446 | if (rdev->raid_disk >= 0 && | |
447 | !test_bit(Faulty, &rdev->flags)) { | |
448 | /* Take two references, one is dropped | |
449 | * when request finishes, one after | |
450 | * we reclaim rcu_read_lock | |
451 | */ | |
452 | struct bio *bi; | |
453 | atomic_inc(&rdev->nr_pending); | |
454 | atomic_inc(&rdev->nr_pending); | |
455 | rcu_read_unlock(); | |
a167f663 | 456 | bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev); |
e9c7469b | 457 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
458 | bi->bi_private = rdev; |
459 | bi->bi_bdev = rdev->bdev; | |
460 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 461 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
462 | rcu_read_lock(); |
463 | rdev_dec_pending(rdev, mddev); | |
464 | } | |
465 | rcu_read_unlock(); | |
a7a07e69 N |
466 | if (atomic_dec_and_test(&mddev->flush_pending)) |
467 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
468 | } |
469 | ||
e9c7469b | 470 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 471 | { |
fd01b88c | 472 | struct mddev *mddev = container_of(ws, struct mddev, flush_work); |
e9c7469b | 473 | struct bio *bio = mddev->flush_bio; |
a2826aa9 | 474 | |
e9c7469b | 475 | if (bio->bi_size == 0) |
a2826aa9 N |
476 | /* an empty barrier - all done */ |
477 | bio_endio(bio, 0); | |
478 | else { | |
e9c7469b | 479 | bio->bi_rw &= ~REQ_FLUSH; |
21a52c6d | 480 | if (mddev->pers->make_request(mddev, bio)) |
a2826aa9 | 481 | generic_make_request(bio); |
a2826aa9 | 482 | } |
2b74e12e N |
483 | |
484 | mddev->flush_bio = NULL; | |
485 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
486 | } |
487 | ||
fd01b88c | 488 | void md_flush_request(struct mddev *mddev, struct bio *bio) |
a2826aa9 N |
489 | { |
490 | spin_lock_irq(&mddev->write_lock); | |
491 | wait_event_lock_irq(mddev->sb_wait, | |
e9c7469b | 492 | !mddev->flush_bio, |
a2826aa9 | 493 | mddev->write_lock, /*nothing*/); |
e9c7469b | 494 | mddev->flush_bio = bio; |
a2826aa9 N |
495 | spin_unlock_irq(&mddev->write_lock); |
496 | ||
a035fc3e N |
497 | INIT_WORK(&mddev->flush_work, submit_flushes); |
498 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 499 | } |
e9c7469b | 500 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 501 | |
97658cdd N |
502 | /* Support for plugging. |
503 | * This mirrors the plugging support in request_queue, but does not | |
504 | * require having a whole queue or request structures. | |
505 | * We allocate an md_plug_cb for each md device and each thread it gets | |
506 | * plugged on. This links tot the private plug_handle structure in the | |
507 | * personality data where we keep a count of the number of outstanding | |
508 | * plugs so other code can see if a plug is active. | |
509 | */ | |
510 | struct md_plug_cb { | |
511 | struct blk_plug_cb cb; | |
fd01b88c | 512 | struct mddev *mddev; |
97658cdd N |
513 | }; |
514 | ||
515 | static void plugger_unplug(struct blk_plug_cb *cb) | |
516 | { | |
517 | struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb); | |
518 | if (atomic_dec_and_test(&mdcb->mddev->plug_cnt)) | |
519 | md_wakeup_thread(mdcb->mddev->thread); | |
520 | kfree(mdcb); | |
521 | } | |
522 | ||
523 | /* Check that an unplug wakeup will come shortly. | |
524 | * If not, wakeup the md thread immediately | |
525 | */ | |
fd01b88c | 526 | int mddev_check_plugged(struct mddev *mddev) |
97658cdd N |
527 | { |
528 | struct blk_plug *plug = current->plug; | |
529 | struct md_plug_cb *mdcb; | |
530 | ||
531 | if (!plug) | |
532 | return 0; | |
533 | ||
534 | list_for_each_entry(mdcb, &plug->cb_list, cb.list) { | |
535 | if (mdcb->cb.callback == plugger_unplug && | |
536 | mdcb->mddev == mddev) { | |
537 | /* Already on the list, move to top */ | |
538 | if (mdcb != list_first_entry(&plug->cb_list, | |
539 | struct md_plug_cb, | |
540 | cb.list)) | |
541 | list_move(&mdcb->cb.list, &plug->cb_list); | |
542 | return 1; | |
543 | } | |
544 | } | |
545 | /* Not currently on the callback list */ | |
546 | mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC); | |
547 | if (!mdcb) | |
548 | return 0; | |
549 | ||
550 | mdcb->mddev = mddev; | |
551 | mdcb->cb.callback = plugger_unplug; | |
552 | atomic_inc(&mddev->plug_cnt); | |
553 | list_add(&mdcb->cb.list, &plug->cb_list); | |
554 | return 1; | |
555 | } | |
556 | EXPORT_SYMBOL_GPL(mddev_check_plugged); | |
2ac87401 | 557 | |
fd01b88c | 558 | static inline struct mddev *mddev_get(struct mddev *mddev) |
1da177e4 LT |
559 | { |
560 | atomic_inc(&mddev->active); | |
561 | return mddev; | |
562 | } | |
563 | ||
5fd3a17e | 564 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 565 | |
fd01b88c | 566 | static void mddev_put(struct mddev *mddev) |
1da177e4 | 567 | { |
a167f663 N |
568 | struct bio_set *bs = NULL; |
569 | ||
1da177e4 LT |
570 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
571 | return; | |
d3374825 | 572 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
573 | mddev->ctime == 0 && !mddev->hold_active) { |
574 | /* Array is not configured at all, and not held active, | |
575 | * so destroy it */ | |
1da177e4 | 576 | list_del(&mddev->all_mddevs); |
a167f663 N |
577 | bs = mddev->bio_set; |
578 | mddev->bio_set = NULL; | |
d3374825 | 579 | if (mddev->gendisk) { |
e804ac78 TH |
580 | /* We did a probe so need to clean up. Call |
581 | * queue_work inside the spinlock so that | |
582 | * flush_workqueue() after mddev_find will | |
583 | * succeed in waiting for the work to be done. | |
d3374825 N |
584 | */ |
585 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 586 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
587 | } else |
588 | kfree(mddev); | |
589 | } | |
590 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
591 | if (bs) |
592 | bioset_free(bs); | |
1da177e4 LT |
593 | } |
594 | ||
fd01b88c | 595 | void mddev_init(struct mddev *mddev) |
fafd7fb0 N |
596 | { |
597 | mutex_init(&mddev->open_mutex); | |
598 | mutex_init(&mddev->reconfig_mutex); | |
599 | mutex_init(&mddev->bitmap_info.mutex); | |
600 | INIT_LIST_HEAD(&mddev->disks); | |
601 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
602 | init_timer(&mddev->safemode_timer); | |
603 | atomic_set(&mddev->active, 1); | |
604 | atomic_set(&mddev->openers, 0); | |
605 | atomic_set(&mddev->active_io, 0); | |
97658cdd | 606 | atomic_set(&mddev->plug_cnt, 0); |
fafd7fb0 N |
607 | spin_lock_init(&mddev->write_lock); |
608 | atomic_set(&mddev->flush_pending, 0); | |
609 | init_waitqueue_head(&mddev->sb_wait); | |
610 | init_waitqueue_head(&mddev->recovery_wait); | |
611 | mddev->reshape_position = MaxSector; | |
612 | mddev->resync_min = 0; | |
613 | mddev->resync_max = MaxSector; | |
614 | mddev->level = LEVEL_NONE; | |
615 | } | |
390ee602 | 616 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 617 | |
fd01b88c | 618 | static struct mddev * mddev_find(dev_t unit) |
1da177e4 | 619 | { |
fd01b88c | 620 | struct mddev *mddev, *new = NULL; |
1da177e4 | 621 | |
8f5f02c4 N |
622 | if (unit && MAJOR(unit) != MD_MAJOR) |
623 | unit &= ~((1<<MdpMinorShift)-1); | |
624 | ||
1da177e4 LT |
625 | retry: |
626 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
627 | |
628 | if (unit) { | |
629 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
630 | if (mddev->unit == unit) { | |
631 | mddev_get(mddev); | |
632 | spin_unlock(&all_mddevs_lock); | |
633 | kfree(new); | |
634 | return mddev; | |
635 | } | |
636 | ||
637 | if (new) { | |
638 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 639 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
640 | new->hold_active = UNTIL_IOCTL; |
641 | return new; | |
1da177e4 | 642 | } |
efeb53c0 N |
643 | } else if (new) { |
644 | /* find an unused unit number */ | |
645 | static int next_minor = 512; | |
646 | int start = next_minor; | |
647 | int is_free = 0; | |
648 | int dev = 0; | |
649 | while (!is_free) { | |
650 | dev = MKDEV(MD_MAJOR, next_minor); | |
651 | next_minor++; | |
652 | if (next_minor > MINORMASK) | |
653 | next_minor = 0; | |
654 | if (next_minor == start) { | |
655 | /* Oh dear, all in use. */ | |
656 | spin_unlock(&all_mddevs_lock); | |
657 | kfree(new); | |
658 | return NULL; | |
659 | } | |
660 | ||
661 | is_free = 1; | |
662 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
663 | if (mddev->unit == dev) { | |
664 | is_free = 0; | |
665 | break; | |
666 | } | |
667 | } | |
668 | new->unit = dev; | |
669 | new->md_minor = MINOR(dev); | |
670 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
671 | list_add(&new->all_mddevs, &all_mddevs); |
672 | spin_unlock(&all_mddevs_lock); | |
673 | return new; | |
674 | } | |
675 | spin_unlock(&all_mddevs_lock); | |
676 | ||
9ffae0cf | 677 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
678 | if (!new) |
679 | return NULL; | |
680 | ||
1da177e4 LT |
681 | new->unit = unit; |
682 | if (MAJOR(unit) == MD_MAJOR) | |
683 | new->md_minor = MINOR(unit); | |
684 | else | |
685 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
686 | ||
fafd7fb0 | 687 | mddev_init(new); |
1da177e4 | 688 | |
1da177e4 LT |
689 | goto retry; |
690 | } | |
691 | ||
fd01b88c | 692 | static inline int mddev_lock(struct mddev * mddev) |
1da177e4 | 693 | { |
df5b89b3 | 694 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
695 | } |
696 | ||
fd01b88c | 697 | static inline int mddev_is_locked(struct mddev *mddev) |
b522adcd DW |
698 | { |
699 | return mutex_is_locked(&mddev->reconfig_mutex); | |
700 | } | |
701 | ||
fd01b88c | 702 | static inline int mddev_trylock(struct mddev * mddev) |
1da177e4 | 703 | { |
df5b89b3 | 704 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
705 | } |
706 | ||
b6eb127d N |
707 | static struct attribute_group md_redundancy_group; |
708 | ||
fd01b88c | 709 | static void mddev_unlock(struct mddev * mddev) |
1da177e4 | 710 | { |
a64c876f | 711 | if (mddev->to_remove) { |
b6eb127d N |
712 | /* These cannot be removed under reconfig_mutex as |
713 | * an access to the files will try to take reconfig_mutex | |
714 | * while holding the file unremovable, which leads to | |
715 | * a deadlock. | |
bb4f1e9d N |
716 | * So hold set sysfs_active while the remove in happeing, |
717 | * and anything else which might set ->to_remove or my | |
718 | * otherwise change the sysfs namespace will fail with | |
719 | * -EBUSY if sysfs_active is still set. | |
720 | * We set sysfs_active under reconfig_mutex and elsewhere | |
721 | * test it under the same mutex to ensure its correct value | |
722 | * is seen. | |
b6eb127d | 723 | */ |
a64c876f N |
724 | struct attribute_group *to_remove = mddev->to_remove; |
725 | mddev->to_remove = NULL; | |
bb4f1e9d | 726 | mddev->sysfs_active = 1; |
b6eb127d N |
727 | mutex_unlock(&mddev->reconfig_mutex); |
728 | ||
00bcb4ac N |
729 | if (mddev->kobj.sd) { |
730 | if (to_remove != &md_redundancy_group) | |
731 | sysfs_remove_group(&mddev->kobj, to_remove); | |
732 | if (mddev->pers == NULL || | |
733 | mddev->pers->sync_request == NULL) { | |
734 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
735 | if (mddev->sysfs_action) | |
736 | sysfs_put(mddev->sysfs_action); | |
737 | mddev->sysfs_action = NULL; | |
738 | } | |
a64c876f | 739 | } |
bb4f1e9d | 740 | mddev->sysfs_active = 0; |
b6eb127d N |
741 | } else |
742 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 743 | |
751e67ca CD |
744 | /* As we've dropped the mutex we need a spinlock to |
745 | * make sure the thread doesn't disappear | |
01f96c0a N |
746 | */ |
747 | spin_lock(&pers_lock); | |
005eca5e | 748 | md_wakeup_thread(mddev->thread); |
01f96c0a | 749 | spin_unlock(&pers_lock); |
1da177e4 LT |
750 | } |
751 | ||
fd01b88c | 752 | static struct md_rdev * find_rdev_nr(struct mddev *mddev, int nr) |
1da177e4 | 753 | { |
3cb03002 | 754 | struct md_rdev *rdev; |
1da177e4 | 755 | |
159ec1fc | 756 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
757 | if (rdev->desc_nr == nr) |
758 | return rdev; | |
159ec1fc | 759 | |
1da177e4 LT |
760 | return NULL; |
761 | } | |
762 | ||
fd01b88c | 763 | static struct md_rdev * find_rdev(struct mddev * mddev, dev_t dev) |
1da177e4 | 764 | { |
3cb03002 | 765 | struct md_rdev *rdev; |
1da177e4 | 766 | |
159ec1fc | 767 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
768 | if (rdev->bdev->bd_dev == dev) |
769 | return rdev; | |
159ec1fc | 770 | |
1da177e4 LT |
771 | return NULL; |
772 | } | |
773 | ||
84fc4b56 | 774 | static struct md_personality *find_pers(int level, char *clevel) |
2604b703 | 775 | { |
84fc4b56 | 776 | struct md_personality *pers; |
d9d166c2 N |
777 | list_for_each_entry(pers, &pers_list, list) { |
778 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 779 | return pers; |
d9d166c2 N |
780 | if (strcmp(pers->name, clevel)==0) |
781 | return pers; | |
782 | } | |
2604b703 N |
783 | return NULL; |
784 | } | |
785 | ||
b73df2d3 | 786 | /* return the offset of the super block in 512byte sectors */ |
3cb03002 | 787 | static inline sector_t calc_dev_sboffset(struct md_rdev *rdev) |
1da177e4 | 788 | { |
57b2caa3 | 789 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 790 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
791 | } |
792 | ||
3cb03002 | 793 | static int alloc_disk_sb(struct md_rdev * rdev) |
1da177e4 LT |
794 | { |
795 | if (rdev->sb_page) | |
796 | MD_BUG(); | |
797 | ||
798 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
799 | if (!rdev->sb_page) { | |
800 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 801 | return -ENOMEM; |
1da177e4 LT |
802 | } |
803 | ||
804 | return 0; | |
805 | } | |
806 | ||
3cb03002 | 807 | static void free_disk_sb(struct md_rdev * rdev) |
1da177e4 LT |
808 | { |
809 | if (rdev->sb_page) { | |
2d1f3b5d | 810 | put_page(rdev->sb_page); |
1da177e4 LT |
811 | rdev->sb_loaded = 0; |
812 | rdev->sb_page = NULL; | |
0f420358 | 813 | rdev->sb_start = 0; |
dd8ac336 | 814 | rdev->sectors = 0; |
1da177e4 | 815 | } |
2699b672 N |
816 | if (rdev->bb_page) { |
817 | put_page(rdev->bb_page); | |
818 | rdev->bb_page = NULL; | |
819 | } | |
1da177e4 LT |
820 | } |
821 | ||
822 | ||
6712ecf8 | 823 | static void super_written(struct bio *bio, int error) |
7bfa19f2 | 824 | { |
3cb03002 | 825 | struct md_rdev *rdev = bio->bi_private; |
fd01b88c | 826 | struct mddev *mddev = rdev->mddev; |
7bfa19f2 | 827 | |
3a0f5bbb N |
828 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
829 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
830 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
831 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 832 | md_error(mddev, rdev); |
3a0f5bbb | 833 | } |
7bfa19f2 | 834 | |
a9701a30 N |
835 | if (atomic_dec_and_test(&mddev->pending_writes)) |
836 | wake_up(&mddev->sb_wait); | |
f8b58edf | 837 | bio_put(bio); |
7bfa19f2 N |
838 | } |
839 | ||
fd01b88c | 840 | void md_super_write(struct mddev *mddev, struct md_rdev *rdev, |
7bfa19f2 N |
841 | sector_t sector, int size, struct page *page) |
842 | { | |
843 | /* write first size bytes of page to sector of rdev | |
844 | * Increment mddev->pending_writes before returning | |
845 | * and decrement it on completion, waking up sb_wait | |
846 | * if zero is reached. | |
847 | * If an error occurred, call md_error | |
848 | */ | |
a167f663 | 849 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 850 | |
a6ff7e08 | 851 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
7bfa19f2 N |
852 | bio->bi_sector = sector; |
853 | bio_add_page(bio, page, size, 0); | |
854 | bio->bi_private = rdev; | |
855 | bio->bi_end_io = super_written; | |
a9701a30 | 856 | |
7bfa19f2 | 857 | atomic_inc(&mddev->pending_writes); |
a5bf4df0 | 858 | submit_bio(WRITE_FLUSH_FUA, bio); |
a9701a30 N |
859 | } |
860 | ||
fd01b88c | 861 | void md_super_wait(struct mddev *mddev) |
a9701a30 | 862 | { |
e9c7469b | 863 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
864 | DEFINE_WAIT(wq); |
865 | for(;;) { | |
866 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
867 | if (atomic_read(&mddev->pending_writes)==0) | |
868 | break; | |
a9701a30 N |
869 | schedule(); |
870 | } | |
871 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
872 | } |
873 | ||
6712ecf8 | 874 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 875 | { |
1da177e4 | 876 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
877 | } |
878 | ||
3cb03002 | 879 | int sync_page_io(struct md_rdev *rdev, sector_t sector, int size, |
ccebd4c4 | 880 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 881 | { |
a167f663 | 882 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
883 | struct completion event; |
884 | int ret; | |
885 | ||
721a9602 | 886 | rw |= REQ_SYNC; |
1da177e4 | 887 | |
a6ff7e08 JB |
888 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
889 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 JB |
890 | if (metadata_op) |
891 | bio->bi_sector = sector + rdev->sb_start; | |
892 | else | |
893 | bio->bi_sector = sector + rdev->data_offset; | |
1da177e4 LT |
894 | bio_add_page(bio, page, size, 0); |
895 | init_completion(&event); | |
896 | bio->bi_private = &event; | |
897 | bio->bi_end_io = bi_complete; | |
898 | submit_bio(rw, bio); | |
899 | wait_for_completion(&event); | |
900 | ||
901 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
902 | bio_put(bio); | |
903 | return ret; | |
904 | } | |
a8745db2 | 905 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 906 | |
3cb03002 | 907 | static int read_disk_sb(struct md_rdev * rdev, int size) |
1da177e4 LT |
908 | { |
909 | char b[BDEVNAME_SIZE]; | |
910 | if (!rdev->sb_page) { | |
911 | MD_BUG(); | |
912 | return -EINVAL; | |
913 | } | |
914 | if (rdev->sb_loaded) | |
915 | return 0; | |
916 | ||
917 | ||
ccebd4c4 | 918 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
919 | goto fail; |
920 | rdev->sb_loaded = 1; | |
921 | return 0; | |
922 | ||
923 | fail: | |
924 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
925 | bdevname(rdev->bdev,b)); | |
926 | return -EINVAL; | |
927 | } | |
928 | ||
929 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
930 | { | |
05710466 AN |
931 | return sb1->set_uuid0 == sb2->set_uuid0 && |
932 | sb1->set_uuid1 == sb2->set_uuid1 && | |
933 | sb1->set_uuid2 == sb2->set_uuid2 && | |
934 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
935 | } |
936 | ||
1da177e4 LT |
937 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
938 | { | |
939 | int ret; | |
940 | mdp_super_t *tmp1, *tmp2; | |
941 | ||
942 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
943 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
944 | ||
945 | if (!tmp1 || !tmp2) { | |
946 | ret = 0; | |
35020f1a | 947 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
948 | goto abort; |
949 | } | |
950 | ||
951 | *tmp1 = *sb1; | |
952 | *tmp2 = *sb2; | |
953 | ||
954 | /* | |
955 | * nr_disks is not constant | |
956 | */ | |
957 | tmp1->nr_disks = 0; | |
958 | tmp2->nr_disks = 0; | |
959 | ||
ce0c8e05 | 960 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 961 | abort: |
990a8baf JJ |
962 | kfree(tmp1); |
963 | kfree(tmp2); | |
1da177e4 LT |
964 | return ret; |
965 | } | |
966 | ||
4d167f09 N |
967 | |
968 | static u32 md_csum_fold(u32 csum) | |
969 | { | |
970 | csum = (csum & 0xffff) + (csum >> 16); | |
971 | return (csum & 0xffff) + (csum >> 16); | |
972 | } | |
973 | ||
1da177e4 LT |
974 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
975 | { | |
4d167f09 N |
976 | u64 newcsum = 0; |
977 | u32 *sb32 = (u32*)sb; | |
978 | int i; | |
1da177e4 LT |
979 | unsigned int disk_csum, csum; |
980 | ||
981 | disk_csum = sb->sb_csum; | |
982 | sb->sb_csum = 0; | |
4d167f09 N |
983 | |
984 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
985 | newcsum += sb32[i]; | |
986 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
987 | ||
988 | ||
989 | #ifdef CONFIG_ALPHA | |
990 | /* This used to use csum_partial, which was wrong for several | |
991 | * reasons including that different results are returned on | |
992 | * different architectures. It isn't critical that we get exactly | |
993 | * the same return value as before (we always csum_fold before | |
994 | * testing, and that removes any differences). However as we | |
995 | * know that csum_partial always returned a 16bit value on | |
996 | * alphas, do a fold to maximise conformity to previous behaviour. | |
997 | */ | |
998 | sb->sb_csum = md_csum_fold(disk_csum); | |
999 | #else | |
1da177e4 | 1000 | sb->sb_csum = disk_csum; |
4d167f09 | 1001 | #endif |
1da177e4 LT |
1002 | return csum; |
1003 | } | |
1004 | ||
1005 | ||
1006 | /* | |
1007 | * Handle superblock details. | |
1008 | * We want to be able to handle multiple superblock formats | |
1009 | * so we have a common interface to them all, and an array of | |
1010 | * different handlers. | |
1011 | * We rely on user-space to write the initial superblock, and support | |
1012 | * reading and updating of superblocks. | |
1013 | * Interface methods are: | |
3cb03002 | 1014 | * int load_super(struct md_rdev *dev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1015 | * loads and validates a superblock on dev. |
1016 | * if refdev != NULL, compare superblocks on both devices | |
1017 | * Return: | |
1018 | * 0 - dev has a superblock that is compatible with refdev | |
1019 | * 1 - dev has a superblock that is compatible and newer than refdev | |
1020 | * so dev should be used as the refdev in future | |
1021 | * -EINVAL superblock incompatible or invalid | |
1022 | * -othererror e.g. -EIO | |
1023 | * | |
fd01b88c | 1024 | * int validate_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
1025 | * Verify that dev is acceptable into mddev. |
1026 | * The first time, mddev->raid_disks will be 0, and data from | |
1027 | * dev should be merged in. Subsequent calls check that dev | |
1028 | * is new enough. Return 0 or -EINVAL | |
1029 | * | |
fd01b88c | 1030 | * void sync_super(struct mddev *mddev, struct md_rdev *dev) |
1da177e4 LT |
1031 | * Update the superblock for rdev with data in mddev |
1032 | * This does not write to disc. | |
1033 | * | |
1034 | */ | |
1035 | ||
1036 | struct super_type { | |
0cd17fec CW |
1037 | char *name; |
1038 | struct module *owner; | |
3cb03002 | 1039 | int (*load_super)(struct md_rdev *rdev, struct md_rdev *refdev, |
0cd17fec | 1040 | int minor_version); |
fd01b88c N |
1041 | int (*validate_super)(struct mddev *mddev, struct md_rdev *rdev); |
1042 | void (*sync_super)(struct mddev *mddev, struct md_rdev *rdev); | |
3cb03002 | 1043 | unsigned long long (*rdev_size_change)(struct md_rdev *rdev, |
15f4a5fd | 1044 | sector_t num_sectors); |
1da177e4 LT |
1045 | }; |
1046 | ||
0894cc30 AN |
1047 | /* |
1048 | * Check that the given mddev has no bitmap. | |
1049 | * | |
1050 | * This function is called from the run method of all personalities that do not | |
1051 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
1052 | * has a bitmap. Otherwise, it returns 0. | |
1053 | * | |
1054 | */ | |
fd01b88c | 1055 | int md_check_no_bitmap(struct mddev *mddev) |
0894cc30 | 1056 | { |
c3d9714e | 1057 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
1058 | return 0; |
1059 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
1060 | mdname(mddev), mddev->pers->name); | |
1061 | return 1; | |
1062 | } | |
1063 | EXPORT_SYMBOL(md_check_no_bitmap); | |
1064 | ||
1da177e4 LT |
1065 | /* |
1066 | * load_super for 0.90.0 | |
1067 | */ | |
3cb03002 | 1068 | static int super_90_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1069 | { |
1070 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
1071 | mdp_super_t *sb; | |
1072 | int ret; | |
1da177e4 LT |
1073 | |
1074 | /* | |
0f420358 | 1075 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
1076 | * it's at the end of the disk. |
1077 | * | |
1078 | * It also happens to be a multiple of 4Kb. | |
1079 | */ | |
57b2caa3 | 1080 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 1081 | |
0002b271 | 1082 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
1083 | if (ret) return ret; |
1084 | ||
1085 | ret = -EINVAL; | |
1086 | ||
1087 | bdevname(rdev->bdev, b); | |
65a06f06 | 1088 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1089 | |
1090 | if (sb->md_magic != MD_SB_MAGIC) { | |
1091 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
1092 | b); | |
1093 | goto abort; | |
1094 | } | |
1095 | ||
1096 | if (sb->major_version != 0 || | |
f6705578 N |
1097 | sb->minor_version < 90 || |
1098 | sb->minor_version > 91) { | |
1da177e4 LT |
1099 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1100 | sb->major_version, sb->minor_version, | |
1101 | b); | |
1102 | goto abort; | |
1103 | } | |
1104 | ||
1105 | if (sb->raid_disks <= 0) | |
1106 | goto abort; | |
1107 | ||
4d167f09 | 1108 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1109 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1110 | b); | |
1111 | goto abort; | |
1112 | } | |
1113 | ||
1114 | rdev->preferred_minor = sb->md_minor; | |
1115 | rdev->data_offset = 0; | |
0002b271 | 1116 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1117 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1118 | |
1119 | if (sb->level == LEVEL_MULTIPATH) | |
1120 | rdev->desc_nr = -1; | |
1121 | else | |
1122 | rdev->desc_nr = sb->this_disk.number; | |
1123 | ||
9a7b2b0f | 1124 | if (!refdev) { |
1da177e4 | 1125 | ret = 1; |
9a7b2b0f | 1126 | } else { |
1da177e4 | 1127 | __u64 ev1, ev2; |
65a06f06 | 1128 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1129 | if (!uuid_equal(refsb, sb)) { |
1130 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1131 | b, bdevname(refdev->bdev,b2)); | |
1132 | goto abort; | |
1133 | } | |
1134 | if (!sb_equal(refsb, sb)) { | |
1135 | printk(KERN_WARNING "md: %s has same UUID" | |
1136 | " but different superblock to %s\n", | |
1137 | b, bdevname(refdev->bdev, b2)); | |
1138 | goto abort; | |
1139 | } | |
1140 | ev1 = md_event(sb); | |
1141 | ev2 = md_event(refsb); | |
1142 | if (ev1 > ev2) | |
1143 | ret = 1; | |
1144 | else | |
1145 | ret = 0; | |
1146 | } | |
8190e754 | 1147 | rdev->sectors = rdev->sb_start; |
27a7b260 N |
1148 | /* Limit to 4TB as metadata cannot record more than that */ |
1149 | if (rdev->sectors >= (2ULL << 32)) | |
1150 | rdev->sectors = (2ULL << 32) - 2; | |
1da177e4 | 1151 | |
27a7b260 | 1152 | if (rdev->sectors < ((sector_t)sb->size) * 2 && sb->level >= 1) |
2bf071bf N |
1153 | /* "this cannot possibly happen" ... */ |
1154 | ret = -EINVAL; | |
1155 | ||
1da177e4 LT |
1156 | abort: |
1157 | return ret; | |
1158 | } | |
1159 | ||
1160 | /* | |
1161 | * validate_super for 0.90.0 | |
1162 | */ | |
fd01b88c | 1163 | static int super_90_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1164 | { |
1165 | mdp_disk_t *desc; | |
65a06f06 | 1166 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1167 | __u64 ev1 = md_event(sb); |
1da177e4 | 1168 | |
41158c7e | 1169 | rdev->raid_disk = -1; |
c5d79adb N |
1170 | clear_bit(Faulty, &rdev->flags); |
1171 | clear_bit(In_sync, &rdev->flags); | |
1172 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1173 | |
1da177e4 LT |
1174 | if (mddev->raid_disks == 0) { |
1175 | mddev->major_version = 0; | |
1176 | mddev->minor_version = sb->minor_version; | |
1177 | mddev->patch_version = sb->patch_version; | |
e691063a | 1178 | mddev->external = 0; |
9d8f0363 | 1179 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1180 | mddev->ctime = sb->ctime; |
1181 | mddev->utime = sb->utime; | |
1182 | mddev->level = sb->level; | |
d9d166c2 | 1183 | mddev->clevel[0] = 0; |
1da177e4 LT |
1184 | mddev->layout = sb->layout; |
1185 | mddev->raid_disks = sb->raid_disks; | |
27a7b260 | 1186 | mddev->dev_sectors = ((sector_t)sb->size) * 2; |
07d84d10 | 1187 | mddev->events = ev1; |
c3d9714e N |
1188 | mddev->bitmap_info.offset = 0; |
1189 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1190 | |
f6705578 N |
1191 | if (mddev->minor_version >= 91) { |
1192 | mddev->reshape_position = sb->reshape_position; | |
1193 | mddev->delta_disks = sb->delta_disks; | |
1194 | mddev->new_level = sb->new_level; | |
1195 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1196 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1197 | } else { |
1198 | mddev->reshape_position = MaxSector; | |
1199 | mddev->delta_disks = 0; | |
1200 | mddev->new_level = mddev->level; | |
1201 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1202 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1203 | } |
1204 | ||
1da177e4 LT |
1205 | if (sb->state & (1<<MD_SB_CLEAN)) |
1206 | mddev->recovery_cp = MaxSector; | |
1207 | else { | |
1208 | if (sb->events_hi == sb->cp_events_hi && | |
1209 | sb->events_lo == sb->cp_events_lo) { | |
1210 | mddev->recovery_cp = sb->recovery_cp; | |
1211 | } else | |
1212 | mddev->recovery_cp = 0; | |
1213 | } | |
1214 | ||
1215 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1216 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1217 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1218 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1219 | ||
1220 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1221 | |
1222 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1223 | mddev->bitmap_info.file == NULL) |
1224 | mddev->bitmap_info.offset = | |
1225 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1226 | |
41158c7e | 1227 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1228 | /* Insist on good event counter while assembling, except |
1229 | * for spares (which don't need an event count) */ | |
1da177e4 | 1230 | ++ev1; |
be6800a7 N |
1231 | if (sb->disks[rdev->desc_nr].state & ( |
1232 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1233 | if (ev1 < mddev->events) | |
1234 | return -EINVAL; | |
41158c7e N |
1235 | } else if (mddev->bitmap) { |
1236 | /* if adding to array with a bitmap, then we can accept an | |
1237 | * older device ... but not too old. | |
1238 | */ | |
41158c7e N |
1239 | if (ev1 < mddev->bitmap->events_cleared) |
1240 | return 0; | |
07d84d10 N |
1241 | } else { |
1242 | if (ev1 < mddev->events) | |
1243 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1244 | return 0; | |
1245 | } | |
41158c7e | 1246 | |
1da177e4 | 1247 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1248 | desc = sb->disks + rdev->desc_nr; |
1249 | ||
1250 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1251 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1252 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1253 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1254 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1255 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1256 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1257 | /* active but not in sync implies recovery up to | |
1258 | * reshape position. We don't know exactly where | |
1259 | * that is, so set to zero for now */ | |
1260 | if (mddev->minor_version >= 91) { | |
1261 | rdev->recovery_offset = 0; | |
1262 | rdev->raid_disk = desc->raid_disk; | |
1263 | } | |
1da177e4 | 1264 | } |
8ddf9efe N |
1265 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1266 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1267 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1268 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1269 | return 0; |
1270 | } | |
1271 | ||
1272 | /* | |
1273 | * sync_super for 0.90.0 | |
1274 | */ | |
fd01b88c | 1275 | static void super_90_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1276 | { |
1277 | mdp_super_t *sb; | |
3cb03002 | 1278 | struct md_rdev *rdev2; |
1da177e4 | 1279 | int next_spare = mddev->raid_disks; |
19133a42 | 1280 | |
1da177e4 LT |
1281 | |
1282 | /* make rdev->sb match mddev data.. | |
1283 | * | |
1284 | * 1/ zero out disks | |
1285 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1286 | * 3/ any empty disks < next_spare become removed | |
1287 | * | |
1288 | * disks[0] gets initialised to REMOVED because | |
1289 | * we cannot be sure from other fields if it has | |
1290 | * been initialised or not. | |
1291 | */ | |
1292 | int i; | |
1293 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1294 | ||
61181565 N |
1295 | rdev->sb_size = MD_SB_BYTES; |
1296 | ||
65a06f06 | 1297 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1298 | |
1299 | memset(sb, 0, sizeof(*sb)); | |
1300 | ||
1301 | sb->md_magic = MD_SB_MAGIC; | |
1302 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1303 | sb->patch_version = mddev->patch_version; |
1304 | sb->gvalid_words = 0; /* ignored */ | |
1305 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1306 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1307 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1308 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1309 | ||
1310 | sb->ctime = mddev->ctime; | |
1311 | sb->level = mddev->level; | |
58c0fed4 | 1312 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1313 | sb->raid_disks = mddev->raid_disks; |
1314 | sb->md_minor = mddev->md_minor; | |
e691063a | 1315 | sb->not_persistent = 0; |
1da177e4 LT |
1316 | sb->utime = mddev->utime; |
1317 | sb->state = 0; | |
1318 | sb->events_hi = (mddev->events>>32); | |
1319 | sb->events_lo = (u32)mddev->events; | |
1320 | ||
f6705578 N |
1321 | if (mddev->reshape_position == MaxSector) |
1322 | sb->minor_version = 90; | |
1323 | else { | |
1324 | sb->minor_version = 91; | |
1325 | sb->reshape_position = mddev->reshape_position; | |
1326 | sb->new_level = mddev->new_level; | |
1327 | sb->delta_disks = mddev->delta_disks; | |
1328 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1329 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1330 | } |
1331 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1332 | if (mddev->in_sync) |
1333 | { | |
1334 | sb->recovery_cp = mddev->recovery_cp; | |
1335 | sb->cp_events_hi = (mddev->events>>32); | |
1336 | sb->cp_events_lo = (u32)mddev->events; | |
1337 | if (mddev->recovery_cp == MaxSector) | |
1338 | sb->state = (1<< MD_SB_CLEAN); | |
1339 | } else | |
1340 | sb->recovery_cp = 0; | |
1341 | ||
1342 | sb->layout = mddev->layout; | |
9d8f0363 | 1343 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1344 | |
c3d9714e | 1345 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1346 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1347 | ||
1da177e4 | 1348 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1349 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1350 | mdp_disk_t *d; |
86e6ffdd | 1351 | int desc_nr; |
0261cd9f N |
1352 | int is_active = test_bit(In_sync, &rdev2->flags); |
1353 | ||
1354 | if (rdev2->raid_disk >= 0 && | |
1355 | sb->minor_version >= 91) | |
1356 | /* we have nowhere to store the recovery_offset, | |
1357 | * but if it is not below the reshape_position, | |
1358 | * we can piggy-back on that. | |
1359 | */ | |
1360 | is_active = 1; | |
1361 | if (rdev2->raid_disk < 0 || | |
1362 | test_bit(Faulty, &rdev2->flags)) | |
1363 | is_active = 0; | |
1364 | if (is_active) | |
86e6ffdd | 1365 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1366 | else |
86e6ffdd | 1367 | desc_nr = next_spare++; |
19133a42 | 1368 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1369 | d = &sb->disks[rdev2->desc_nr]; |
1370 | nr_disks++; | |
1371 | d->number = rdev2->desc_nr; | |
1372 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1373 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1374 | if (is_active) |
1da177e4 LT |
1375 | d->raid_disk = rdev2->raid_disk; |
1376 | else | |
1377 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1378 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1379 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1380 | else if (is_active) { |
1da177e4 | 1381 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1382 | if (test_bit(In_sync, &rdev2->flags)) |
1383 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1384 | active++; |
1385 | working++; | |
1386 | } else { | |
1387 | d->state = 0; | |
1388 | spare++; | |
1389 | working++; | |
1390 | } | |
8ddf9efe N |
1391 | if (test_bit(WriteMostly, &rdev2->flags)) |
1392 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1393 | } |
1da177e4 LT |
1394 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1395 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1396 | mdp_disk_t *d = &sb->disks[i]; | |
1397 | if (d->state == 0 && d->number == 0) { | |
1398 | d->number = i; | |
1399 | d->raid_disk = i; | |
1400 | d->state = (1<<MD_DISK_REMOVED); | |
1401 | d->state |= (1<<MD_DISK_FAULTY); | |
1402 | failed++; | |
1403 | } | |
1404 | } | |
1405 | sb->nr_disks = nr_disks; | |
1406 | sb->active_disks = active; | |
1407 | sb->working_disks = working; | |
1408 | sb->failed_disks = failed; | |
1409 | sb->spare_disks = spare; | |
1410 | ||
1411 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1412 | sb->sb_csum = calc_sb_csum(sb); | |
1413 | } | |
1414 | ||
0cd17fec CW |
1415 | /* |
1416 | * rdev_size_change for 0.90.0 | |
1417 | */ | |
1418 | static unsigned long long | |
3cb03002 | 1419 | super_90_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec | 1420 | { |
58c0fed4 | 1421 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1422 | return 0; /* component must fit device */ |
c3d9714e | 1423 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1424 | return 0; /* can't move bitmap */ |
57b2caa3 | 1425 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1426 | if (!num_sectors || num_sectors > rdev->sb_start) |
1427 | num_sectors = rdev->sb_start; | |
27a7b260 N |
1428 | /* Limit to 4TB as metadata cannot record more than that. |
1429 | * 4TB == 2^32 KB, or 2*2^32 sectors. | |
1430 | */ | |
1431 | if (num_sectors >= (2ULL << 32)) | |
1432 | num_sectors = (2ULL << 32) - 2; | |
0f420358 | 1433 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1434 | rdev->sb_page); |
1435 | md_super_wait(rdev->mddev); | |
c26a44ed | 1436 | return num_sectors; |
0cd17fec CW |
1437 | } |
1438 | ||
1439 | ||
1da177e4 LT |
1440 | /* |
1441 | * version 1 superblock | |
1442 | */ | |
1443 | ||
1c05b4bc | 1444 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1445 | { |
1c05b4bc N |
1446 | __le32 disk_csum; |
1447 | u32 csum; | |
1da177e4 LT |
1448 | unsigned long long newcsum; |
1449 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1450 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1451 | int i; |
1452 | ||
1453 | disk_csum = sb->sb_csum; | |
1454 | sb->sb_csum = 0; | |
1455 | newcsum = 0; | |
1456 | for (i=0; size>=4; size -= 4 ) | |
1457 | newcsum += le32_to_cpu(*isuper++); | |
1458 | ||
1459 | if (size == 2) | |
1c05b4bc | 1460 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1461 | |
1462 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1463 | sb->sb_csum = disk_csum; | |
1464 | return cpu_to_le32(csum); | |
1465 | } | |
1466 | ||
2699b672 N |
1467 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1468 | int acknowledged); | |
3cb03002 | 1469 | static int super_1_load(struct md_rdev *rdev, struct md_rdev *refdev, int minor_version) |
1da177e4 LT |
1470 | { |
1471 | struct mdp_superblock_1 *sb; | |
1472 | int ret; | |
0f420358 | 1473 | sector_t sb_start; |
1da177e4 | 1474 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1475 | int bmask; |
1da177e4 LT |
1476 | |
1477 | /* | |
0f420358 | 1478 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1479 | * It is always aligned to a 4K boundary and |
1480 | * depeding on minor_version, it can be: | |
1481 | * 0: At least 8K, but less than 12K, from end of device | |
1482 | * 1: At start of device | |
1483 | * 2: 4K from start of device. | |
1484 | */ | |
1485 | switch(minor_version) { | |
1486 | case 0: | |
77304d2a | 1487 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1488 | sb_start -= 8*2; |
1489 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1490 | break; |
1491 | case 1: | |
0f420358 | 1492 | sb_start = 0; |
1da177e4 LT |
1493 | break; |
1494 | case 2: | |
0f420358 | 1495 | sb_start = 8; |
1da177e4 LT |
1496 | break; |
1497 | default: | |
1498 | return -EINVAL; | |
1499 | } | |
0f420358 | 1500 | rdev->sb_start = sb_start; |
1da177e4 | 1501 | |
0002b271 N |
1502 | /* superblock is rarely larger than 1K, but it can be larger, |
1503 | * and it is safe to read 4k, so we do that | |
1504 | */ | |
1505 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1506 | if (ret) return ret; |
1507 | ||
1508 | ||
65a06f06 | 1509 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1510 | |
1511 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1512 | sb->major_version != cpu_to_le32(1) || | |
1513 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1514 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1515 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1516 | return -EINVAL; |
1517 | ||
1518 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1519 | printk("md: invalid superblock checksum on %s\n", | |
1520 | bdevname(rdev->bdev,b)); | |
1521 | return -EINVAL; | |
1522 | } | |
1523 | if (le64_to_cpu(sb->data_size) < 10) { | |
1524 | printk("md: data_size too small on %s\n", | |
1525 | bdevname(rdev->bdev,b)); | |
1526 | return -EINVAL; | |
1527 | } | |
e11e93fa | 1528 | |
1da177e4 LT |
1529 | rdev->preferred_minor = 0xffff; |
1530 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1531 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1532 | |
0002b271 | 1533 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1534 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1535 | if (rdev->sb_size & bmask) |
a1801f85 N |
1536 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1537 | ||
1538 | if (minor_version | |
0f420358 | 1539 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1540 | return -EINVAL; |
0002b271 | 1541 | |
31b65a0d N |
1542 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1543 | rdev->desc_nr = -1; | |
1544 | else | |
1545 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1546 | ||
2699b672 N |
1547 | if (!rdev->bb_page) { |
1548 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1549 | if (!rdev->bb_page) | |
1550 | return -ENOMEM; | |
1551 | } | |
1552 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1553 | rdev->badblocks.count == 0) { | |
1554 | /* need to load the bad block list. | |
1555 | * Currently we limit it to one page. | |
1556 | */ | |
1557 | s32 offset; | |
1558 | sector_t bb_sector; | |
1559 | u64 *bbp; | |
1560 | int i; | |
1561 | int sectors = le16_to_cpu(sb->bblog_size); | |
1562 | if (sectors > (PAGE_SIZE / 512)) | |
1563 | return -EINVAL; | |
1564 | offset = le32_to_cpu(sb->bblog_offset); | |
1565 | if (offset == 0) | |
1566 | return -EINVAL; | |
1567 | bb_sector = (long long)offset; | |
1568 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1569 | rdev->bb_page, READ, true)) | |
1570 | return -EIO; | |
1571 | bbp = (u64 *)page_address(rdev->bb_page); | |
1572 | rdev->badblocks.shift = sb->bblog_shift; | |
1573 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1574 | u64 bb = le64_to_cpu(*bbp); | |
1575 | int count = bb & (0x3ff); | |
1576 | u64 sector = bb >> 10; | |
1577 | sector <<= sb->bblog_shift; | |
1578 | count <<= sb->bblog_shift; | |
1579 | if (bb + 1 == 0) | |
1580 | break; | |
1581 | if (md_set_badblocks(&rdev->badblocks, | |
1582 | sector, count, 1) == 0) | |
1583 | return -EINVAL; | |
1584 | } | |
1585 | } else if (sb->bblog_offset == 0) | |
1586 | rdev->badblocks.shift = -1; | |
1587 | ||
9a7b2b0f | 1588 | if (!refdev) { |
8ed75463 | 1589 | ret = 1; |
9a7b2b0f | 1590 | } else { |
1da177e4 | 1591 | __u64 ev1, ev2; |
65a06f06 | 1592 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1593 | |
1594 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1595 | sb->level != refsb->level || | |
1596 | sb->layout != refsb->layout || | |
1597 | sb->chunksize != refsb->chunksize) { | |
1598 | printk(KERN_WARNING "md: %s has strangely different" | |
1599 | " superblock to %s\n", | |
1600 | bdevname(rdev->bdev,b), | |
1601 | bdevname(refdev->bdev,b2)); | |
1602 | return -EINVAL; | |
1603 | } | |
1604 | ev1 = le64_to_cpu(sb->events); | |
1605 | ev2 = le64_to_cpu(refsb->events); | |
1606 | ||
1607 | if (ev1 > ev2) | |
8ed75463 N |
1608 | ret = 1; |
1609 | else | |
1610 | ret = 0; | |
1da177e4 | 1611 | } |
a1801f85 | 1612 | if (minor_version) |
77304d2a | 1613 | rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 1614 | le64_to_cpu(sb->data_offset); |
1da177e4 | 1615 | else |
dd8ac336 AN |
1616 | rdev->sectors = rdev->sb_start; |
1617 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1618 | return -EINVAL; |
dd8ac336 | 1619 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1620 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1621 | return -EINVAL; |
8ed75463 | 1622 | return ret; |
1da177e4 LT |
1623 | } |
1624 | ||
fd01b88c | 1625 | static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 | 1626 | { |
65a06f06 | 1627 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1628 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1629 | |
41158c7e | 1630 | rdev->raid_disk = -1; |
c5d79adb N |
1631 | clear_bit(Faulty, &rdev->flags); |
1632 | clear_bit(In_sync, &rdev->flags); | |
1633 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1634 | |
1da177e4 LT |
1635 | if (mddev->raid_disks == 0) { |
1636 | mddev->major_version = 1; | |
1637 | mddev->patch_version = 0; | |
e691063a | 1638 | mddev->external = 0; |
9d8f0363 | 1639 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1640 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1641 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1642 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1643 | mddev->clevel[0] = 0; |
1da177e4 LT |
1644 | mddev->layout = le32_to_cpu(sb->layout); |
1645 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1646 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1647 | mddev->events = ev1; |
c3d9714e N |
1648 | mddev->bitmap_info.offset = 0; |
1649 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1650 | |
1651 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1652 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1653 | ||
1654 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1655 | |
71c0805c | 1656 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1657 | mddev->bitmap_info.file == NULL ) |
1658 | mddev->bitmap_info.offset = | |
1659 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1660 | |
f6705578 N |
1661 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1662 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1663 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1664 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1665 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1666 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1667 | } else { |
1668 | mddev->reshape_position = MaxSector; | |
1669 | mddev->delta_disks = 0; | |
1670 | mddev->new_level = mddev->level; | |
1671 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1672 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1673 | } |
1674 | ||
41158c7e | 1675 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1676 | /* Insist of good event counter while assembling, except for |
1677 | * spares (which don't need an event count) */ | |
1da177e4 | 1678 | ++ev1; |
be6800a7 N |
1679 | if (rdev->desc_nr >= 0 && |
1680 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1681 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1682 | if (ev1 < mddev->events) | |
1683 | return -EINVAL; | |
41158c7e N |
1684 | } else if (mddev->bitmap) { |
1685 | /* If adding to array with a bitmap, then we can accept an | |
1686 | * older device, but not too old. | |
1687 | */ | |
41158c7e N |
1688 | if (ev1 < mddev->bitmap->events_cleared) |
1689 | return 0; | |
07d84d10 N |
1690 | } else { |
1691 | if (ev1 < mddev->events) | |
1692 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1693 | return 0; | |
1694 | } | |
1da177e4 LT |
1695 | if (mddev->level != LEVEL_MULTIPATH) { |
1696 | int role; | |
3673f305 N |
1697 | if (rdev->desc_nr < 0 || |
1698 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1699 | role = 0xffff; | |
1700 | rdev->desc_nr = -1; | |
1701 | } else | |
1702 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1703 | switch(role) { |
1704 | case 0xffff: /* spare */ | |
1da177e4 LT |
1705 | break; |
1706 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1707 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1708 | break; |
1709 | default: | |
5fd6c1dc N |
1710 | if ((le32_to_cpu(sb->feature_map) & |
1711 | MD_FEATURE_RECOVERY_OFFSET)) | |
1712 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1713 | else | |
1714 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1715 | rdev->raid_disk = role; |
1716 | break; | |
1717 | } | |
8ddf9efe N |
1718 | if (sb->devflags & WriteMostly1) |
1719 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1720 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1721 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1722 | |
1da177e4 LT |
1723 | return 0; |
1724 | } | |
1725 | ||
fd01b88c | 1726 | static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
1727 | { |
1728 | struct mdp_superblock_1 *sb; | |
3cb03002 | 1729 | struct md_rdev *rdev2; |
1da177e4 LT |
1730 | int max_dev, i; |
1731 | /* make rdev->sb match mddev and rdev data. */ | |
1732 | ||
65a06f06 | 1733 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1734 | |
1735 | sb->feature_map = 0; | |
1736 | sb->pad0 = 0; | |
5fd6c1dc | 1737 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 | 1738 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1da177e4 LT |
1739 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1740 | ||
1741 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1742 | sb->events = cpu_to_le64(mddev->events); | |
1743 | if (mddev->in_sync) | |
1744 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1745 | else | |
1746 | sb->resync_offset = cpu_to_le64(0); | |
1747 | ||
1c05b4bc | 1748 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1749 | |
f0ca340c | 1750 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1751 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1752 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1753 | sb->level = cpu_to_le32(mddev->level); |
1754 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1755 | |
aeb9b211 N |
1756 | if (test_bit(WriteMostly, &rdev->flags)) |
1757 | sb->devflags |= WriteMostly1; | |
1758 | else | |
1759 | sb->devflags &= ~WriteMostly1; | |
1760 | ||
c3d9714e N |
1761 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1762 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1763 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1764 | } |
5fd6c1dc N |
1765 | |
1766 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1767 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1768 | sb->feature_map |= |
1769 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1770 | sb->recovery_offset = | |
1771 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1772 | } |
1773 | ||
f6705578 N |
1774 | if (mddev->reshape_position != MaxSector) { |
1775 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1776 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1777 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1778 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1779 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1780 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1781 | } |
a654b9d8 | 1782 | |
2699b672 N |
1783 | if (rdev->badblocks.count == 0) |
1784 | /* Nothing to do for bad blocks*/ ; | |
1785 | else if (sb->bblog_offset == 0) | |
1786 | /* Cannot record bad blocks on this device */ | |
1787 | md_error(mddev, rdev); | |
1788 | else { | |
1789 | struct badblocks *bb = &rdev->badblocks; | |
1790 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1791 | u64 *p = bb->page; | |
1792 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1793 | if (bb->changed) { | |
1794 | unsigned seq; | |
1795 | ||
1796 | retry: | |
1797 | seq = read_seqbegin(&bb->lock); | |
1798 | ||
1799 | memset(bbp, 0xff, PAGE_SIZE); | |
1800 | ||
1801 | for (i = 0 ; i < bb->count ; i++) { | |
1802 | u64 internal_bb = *p++; | |
1803 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) | |
1804 | | BB_LEN(internal_bb)); | |
1805 | *bbp++ = cpu_to_le64(store_bb); | |
1806 | } | |
1807 | if (read_seqretry(&bb->lock, seq)) | |
1808 | goto retry; | |
1809 | ||
1810 | bb->sector = (rdev->sb_start + | |
1811 | (int)le32_to_cpu(sb->bblog_offset)); | |
1812 | bb->size = le16_to_cpu(sb->bblog_size); | |
1813 | bb->changed = 0; | |
1814 | } | |
1815 | } | |
1816 | ||
1da177e4 | 1817 | max_dev = 0; |
159ec1fc | 1818 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1819 | if (rdev2->desc_nr+1 > max_dev) |
1820 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1821 | |
70471daf N |
1822 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1823 | int bmask; | |
a778b73f | 1824 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1825 | rdev->sb_size = max_dev * 2 + 256; |
1826 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1827 | if (rdev->sb_size & bmask) | |
1828 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1829 | } else |
1830 | max_dev = le32_to_cpu(sb->max_dev); | |
1831 | ||
1da177e4 LT |
1832 | for (i=0; i<max_dev;i++) |
1833 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1834 | ||
159ec1fc | 1835 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1836 | i = rdev2->desc_nr; |
b2d444d7 | 1837 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1838 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1839 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1840 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1841 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1842 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1843 | else |
1844 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1845 | } | |
1846 | ||
1da177e4 LT |
1847 | sb->sb_csum = calc_sb_1_csum(sb); |
1848 | } | |
1849 | ||
0cd17fec | 1850 | static unsigned long long |
3cb03002 | 1851 | super_1_rdev_size_change(struct md_rdev *rdev, sector_t num_sectors) |
0cd17fec CW |
1852 | { |
1853 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1854 | sector_t max_sectors; |
58c0fed4 | 1855 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1856 | return 0; /* component must fit device */ |
0f420358 | 1857 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1858 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1859 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1860 | max_sectors -= rdev->data_offset; |
1861 | if (!num_sectors || num_sectors > max_sectors) | |
1862 | num_sectors = max_sectors; | |
c3d9714e | 1863 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1864 | /* minor version 0 with bitmap we can't move */ |
1865 | return 0; | |
1866 | } else { | |
1867 | /* minor version 0; superblock after data */ | |
0f420358 | 1868 | sector_t sb_start; |
77304d2a | 1869 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1870 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1871 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1872 | if (!num_sectors || num_sectors > max_sectors) |
1873 | num_sectors = max_sectors; | |
0f420358 | 1874 | rdev->sb_start = sb_start; |
0cd17fec | 1875 | } |
65a06f06 | 1876 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1877 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1878 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1879 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1880 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1881 | rdev->sb_page); |
1882 | md_super_wait(rdev->mddev); | |
c26a44ed | 1883 | return num_sectors; |
0cd17fec | 1884 | } |
1da177e4 | 1885 | |
75c96f85 | 1886 | static struct super_type super_types[] = { |
1da177e4 LT |
1887 | [0] = { |
1888 | .name = "0.90.0", | |
1889 | .owner = THIS_MODULE, | |
0cd17fec CW |
1890 | .load_super = super_90_load, |
1891 | .validate_super = super_90_validate, | |
1892 | .sync_super = super_90_sync, | |
1893 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1894 | }, |
1895 | [1] = { | |
1896 | .name = "md-1", | |
1897 | .owner = THIS_MODULE, | |
0cd17fec CW |
1898 | .load_super = super_1_load, |
1899 | .validate_super = super_1_validate, | |
1900 | .sync_super = super_1_sync, | |
1901 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1902 | }, |
1903 | }; | |
1da177e4 | 1904 | |
fd01b88c | 1905 | static void sync_super(struct mddev *mddev, struct md_rdev *rdev) |
076f968b JB |
1906 | { |
1907 | if (mddev->sync_super) { | |
1908 | mddev->sync_super(mddev, rdev); | |
1909 | return; | |
1910 | } | |
1911 | ||
1912 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1913 | ||
1914 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1915 | } | |
1916 | ||
fd01b88c | 1917 | static int match_mddev_units(struct mddev *mddev1, struct mddev *mddev2) |
1da177e4 | 1918 | { |
3cb03002 | 1919 | struct md_rdev *rdev, *rdev2; |
1da177e4 | 1920 | |
4b80991c N |
1921 | rcu_read_lock(); |
1922 | rdev_for_each_rcu(rdev, mddev1) | |
1923 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1924 | if (rdev->bdev->bd_contains == |
4b80991c N |
1925 | rdev2->bdev->bd_contains) { |
1926 | rcu_read_unlock(); | |
7dd5e7c3 | 1927 | return 1; |
4b80991c N |
1928 | } |
1929 | rcu_read_unlock(); | |
1da177e4 LT |
1930 | return 0; |
1931 | } | |
1932 | ||
1933 | static LIST_HEAD(pending_raid_disks); | |
1934 | ||
ac5e7113 AN |
1935 | /* |
1936 | * Try to register data integrity profile for an mddev | |
1937 | * | |
1938 | * This is called when an array is started and after a disk has been kicked | |
1939 | * from the array. It only succeeds if all working and active component devices | |
1940 | * are integrity capable with matching profiles. | |
1941 | */ | |
fd01b88c | 1942 | int md_integrity_register(struct mddev *mddev) |
ac5e7113 | 1943 | { |
3cb03002 | 1944 | struct md_rdev *rdev, *reference = NULL; |
ac5e7113 AN |
1945 | |
1946 | if (list_empty(&mddev->disks)) | |
1947 | return 0; /* nothing to do */ | |
629acb6a JB |
1948 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1949 | return 0; /* shouldn't register, or already is */ | |
ac5e7113 AN |
1950 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1951 | /* skip spares and non-functional disks */ | |
1952 | if (test_bit(Faulty, &rdev->flags)) | |
1953 | continue; | |
1954 | if (rdev->raid_disk < 0) | |
1955 | continue; | |
ac5e7113 AN |
1956 | if (!reference) { |
1957 | /* Use the first rdev as the reference */ | |
1958 | reference = rdev; | |
1959 | continue; | |
1960 | } | |
1961 | /* does this rdev's profile match the reference profile? */ | |
1962 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1963 | rdev->bdev->bd_disk) < 0) | |
1964 | return -EINVAL; | |
1965 | } | |
89078d57 MP |
1966 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1967 | return 0; | |
ac5e7113 AN |
1968 | /* |
1969 | * All component devices are integrity capable and have matching | |
1970 | * profiles, register the common profile for the md device. | |
1971 | */ | |
1972 | if (blk_integrity_register(mddev->gendisk, | |
1973 | bdev_get_integrity(reference->bdev)) != 0) { | |
1974 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1975 | mdname(mddev)); | |
1976 | return -EINVAL; | |
1977 | } | |
a91a2785 MP |
1978 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
1979 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
1980 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
1981 | mdname(mddev)); | |
1982 | return -EINVAL; | |
1983 | } | |
ac5e7113 AN |
1984 | return 0; |
1985 | } | |
1986 | EXPORT_SYMBOL(md_integrity_register); | |
1987 | ||
1988 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
fd01b88c | 1989 | void md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev) |
3f9d99c1 | 1990 | { |
3f9d99c1 | 1991 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1992 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1993 | |
ac5e7113 | 1994 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1995 | return; |
ac5e7113 | 1996 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1997 | return; |
ac5e7113 AN |
1998 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1999 | rdev->bdev->bd_disk) >= 0) | |
2000 | return; | |
2001 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
2002 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 2003 | } |
ac5e7113 | 2004 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 2005 | |
fd01b88c | 2006 | static int bind_rdev_to_array(struct md_rdev * rdev, struct mddev * mddev) |
1da177e4 | 2007 | { |
7dd5e7c3 | 2008 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 2009 | struct kobject *ko; |
1edf80d3 | 2010 | char *s; |
5e55e2f5 | 2011 | int err; |
1da177e4 LT |
2012 | |
2013 | if (rdev->mddev) { | |
2014 | MD_BUG(); | |
2015 | return -EINVAL; | |
2016 | } | |
11e2ede0 DW |
2017 | |
2018 | /* prevent duplicates */ | |
2019 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2020 | return -EEXIST; | |
2021 | ||
dd8ac336 AN |
2022 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2023 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2024 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2025 | if (mddev->pers) { |
2026 | /* Cannot change size, so fail | |
2027 | * If mddev->level <= 0, then we don't care | |
2028 | * about aligning sizes (e.g. linear) | |
2029 | */ | |
2030 | if (mddev->level > 0) | |
2031 | return -ENOSPC; | |
2032 | } else | |
dd8ac336 | 2033 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2034 | } |
1da177e4 LT |
2035 | |
2036 | /* Verify rdev->desc_nr is unique. | |
2037 | * If it is -1, assign a free number, else | |
2038 | * check number is not in use | |
2039 | */ | |
2040 | if (rdev->desc_nr < 0) { | |
2041 | int choice = 0; | |
2042 | if (mddev->pers) choice = mddev->raid_disks; | |
2043 | while (find_rdev_nr(mddev, choice)) | |
2044 | choice++; | |
2045 | rdev->desc_nr = choice; | |
2046 | } else { | |
2047 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
2048 | return -EBUSY; | |
2049 | } | |
de01dfad N |
2050 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2051 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2052 | mdname(mddev), mddev->max_disks); | |
2053 | return -EBUSY; | |
2054 | } | |
19133a42 | 2055 | bdevname(rdev->bdev,b); |
649316b2 | 2056 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2057 | *s = '!'; |
649316b2 | 2058 | |
1da177e4 | 2059 | rdev->mddev = mddev; |
19133a42 | 2060 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2061 | |
b2d6db58 | 2062 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2063 | goto fail; |
86e6ffdd | 2064 | |
0762b8bd | 2065 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2066 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2067 | /* failure here is OK */; | |
2068 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2069 | |
4b80991c | 2070 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2071 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2072 | |
2073 | /* May as well allow recovery to be retried once */ | |
5389042f | 2074 | mddev->recovery_disabled++; |
3f9d99c1 | 2075 | |
1da177e4 | 2076 | return 0; |
5e55e2f5 N |
2077 | |
2078 | fail: | |
2079 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2080 | b, mdname(mddev)); | |
2081 | return err; | |
1da177e4 LT |
2082 | } |
2083 | ||
177a99b2 | 2084 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 | 2085 | { |
3cb03002 | 2086 | struct md_rdev *rdev = container_of(ws, struct md_rdev, del_work); |
5792a285 | 2087 | kobject_del(&rdev->kobj); |
177a99b2 | 2088 | kobject_put(&rdev->kobj); |
5792a285 N |
2089 | } |
2090 | ||
3cb03002 | 2091 | static void unbind_rdev_from_array(struct md_rdev * rdev) |
1da177e4 LT |
2092 | { |
2093 | char b[BDEVNAME_SIZE]; | |
2094 | if (!rdev->mddev) { | |
2095 | MD_BUG(); | |
2096 | return; | |
2097 | } | |
49731baa | 2098 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2099 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2100 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2101 | rdev->mddev = NULL; | |
86e6ffdd | 2102 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2103 | sysfs_put(rdev->sysfs_state); |
2104 | rdev->sysfs_state = NULL; | |
2230dfe4 N |
2105 | kfree(rdev->badblocks.page); |
2106 | rdev->badblocks.count = 0; | |
2107 | rdev->badblocks.page = NULL; | |
5792a285 | 2108 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2109 | * writing to 'remove' to "dev/state". We also need |
2110 | * to delay it due to rcu usage. | |
5792a285 | 2111 | */ |
4b80991c | 2112 | synchronize_rcu(); |
177a99b2 N |
2113 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2114 | kobject_get(&rdev->kobj); | |
e804ac78 | 2115 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2116 | } |
2117 | ||
2118 | /* | |
2119 | * prevent the device from being mounted, repartitioned or | |
2120 | * otherwise reused by a RAID array (or any other kernel | |
2121 | * subsystem), by bd_claiming the device. | |
2122 | */ | |
3cb03002 | 2123 | static int lock_rdev(struct md_rdev *rdev, dev_t dev, int shared) |
1da177e4 LT |
2124 | { |
2125 | int err = 0; | |
2126 | struct block_device *bdev; | |
2127 | char b[BDEVNAME_SIZE]; | |
2128 | ||
d4d77629 | 2129 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
3cb03002 | 2130 | shared ? (struct md_rdev *)lock_rdev : rdev); |
1da177e4 LT |
2131 | if (IS_ERR(bdev)) { |
2132 | printk(KERN_ERR "md: could not open %s.\n", | |
2133 | __bdevname(dev, b)); | |
2134 | return PTR_ERR(bdev); | |
2135 | } | |
1da177e4 LT |
2136 | rdev->bdev = bdev; |
2137 | return err; | |
2138 | } | |
2139 | ||
3cb03002 | 2140 | static void unlock_rdev(struct md_rdev *rdev) |
1da177e4 LT |
2141 | { |
2142 | struct block_device *bdev = rdev->bdev; | |
2143 | rdev->bdev = NULL; | |
2144 | if (!bdev) | |
2145 | MD_BUG(); | |
e525fd89 | 2146 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2147 | } |
2148 | ||
2149 | void md_autodetect_dev(dev_t dev); | |
2150 | ||
3cb03002 | 2151 | static void export_rdev(struct md_rdev * rdev) |
1da177e4 LT |
2152 | { |
2153 | char b[BDEVNAME_SIZE]; | |
2154 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
2155 | bdevname(rdev->bdev,b)); | |
2156 | if (rdev->mddev) | |
2157 | MD_BUG(); | |
2158 | free_disk_sb(rdev); | |
1da177e4 | 2159 | #ifndef MODULE |
d0fae18f N |
2160 | if (test_bit(AutoDetected, &rdev->flags)) |
2161 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2162 | #endif |
2163 | unlock_rdev(rdev); | |
86e6ffdd | 2164 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2165 | } |
2166 | ||
3cb03002 | 2167 | static void kick_rdev_from_array(struct md_rdev * rdev) |
1da177e4 LT |
2168 | { |
2169 | unbind_rdev_from_array(rdev); | |
2170 | export_rdev(rdev); | |
2171 | } | |
2172 | ||
fd01b88c | 2173 | static void export_array(struct mddev *mddev) |
1da177e4 | 2174 | { |
3cb03002 | 2175 | struct md_rdev *rdev, *tmp; |
1da177e4 | 2176 | |
d089c6af | 2177 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2178 | if (!rdev->mddev) { |
2179 | MD_BUG(); | |
2180 | continue; | |
2181 | } | |
2182 | kick_rdev_from_array(rdev); | |
2183 | } | |
2184 | if (!list_empty(&mddev->disks)) | |
2185 | MD_BUG(); | |
2186 | mddev->raid_disks = 0; | |
2187 | mddev->major_version = 0; | |
2188 | } | |
2189 | ||
2190 | static void print_desc(mdp_disk_t *desc) | |
2191 | { | |
2192 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2193 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2194 | } | |
2195 | ||
cd2ac932 | 2196 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2197 | { |
2198 | int i; | |
2199 | ||
2200 | printk(KERN_INFO | |
2201 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2202 | sb->major_version, sb->minor_version, sb->patch_version, | |
2203 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2204 | sb->ctime); | |
2205 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2206 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2207 | sb->md_minor, sb->layout, sb->chunk_size); | |
2208 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2209 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2210 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2211 | sb->failed_disks, sb->spare_disks, | |
2212 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2213 | ||
2214 | printk(KERN_INFO); | |
2215 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2216 | mdp_disk_t *desc; | |
2217 | ||
2218 | desc = sb->disks + i; | |
2219 | if (desc->number || desc->major || desc->minor || | |
2220 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2221 | printk(" D %2d: ", i); | |
2222 | print_desc(desc); | |
2223 | } | |
2224 | } | |
2225 | printk(KERN_INFO "md: THIS: "); | |
2226 | print_desc(&sb->this_disk); | |
cd2ac932 | 2227 | } |
1da177e4 | 2228 | |
cd2ac932 CR |
2229 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2230 | { | |
2231 | __u8 *uuid; | |
2232 | ||
2233 | uuid = sb->set_uuid; | |
ad361c98 | 2234 | printk(KERN_INFO |
7b75c2f8 | 2235 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2236 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2237 | le32_to_cpu(sb->major_version), |
2238 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2239 | uuid, |
cd2ac932 CR |
2240 | sb->set_name, |
2241 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2242 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2243 | ||
2244 | uuid = sb->device_uuid; | |
ad361c98 JP |
2245 | printk(KERN_INFO |
2246 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2247 | " RO:%llu\n" |
7b75c2f8 | 2248 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2249 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2250 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2251 | le32_to_cpu(sb->level), |
2252 | (unsigned long long)le64_to_cpu(sb->size), | |
2253 | le32_to_cpu(sb->raid_disks), | |
2254 | le32_to_cpu(sb->layout), | |
2255 | le32_to_cpu(sb->chunksize), | |
2256 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2257 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2258 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2259 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2260 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2261 | uuid, |
cd2ac932 CR |
2262 | sb->devflags, |
2263 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2264 | (unsigned long long)le64_to_cpu(sb->events), | |
2265 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2266 | le32_to_cpu(sb->sb_csum), | |
2267 | le32_to_cpu(sb->max_dev) | |
2268 | ); | |
1da177e4 LT |
2269 | } |
2270 | ||
3cb03002 | 2271 | static void print_rdev(struct md_rdev *rdev, int major_version) |
1da177e4 LT |
2272 | { |
2273 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2274 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2275 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2276 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2277 | rdev->desc_nr); | |
1da177e4 | 2278 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2279 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2280 | switch (major_version) { | |
2281 | case 0: | |
65a06f06 | 2282 | print_sb_90(page_address(rdev->sb_page)); |
cd2ac932 CR |
2283 | break; |
2284 | case 1: | |
65a06f06 | 2285 | print_sb_1(page_address(rdev->sb_page)); |
cd2ac932 CR |
2286 | break; |
2287 | } | |
1da177e4 LT |
2288 | } else |
2289 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2290 | } | |
2291 | ||
5e56341d | 2292 | static void md_print_devices(void) |
1da177e4 | 2293 | { |
159ec1fc | 2294 | struct list_head *tmp; |
3cb03002 | 2295 | struct md_rdev *rdev; |
fd01b88c | 2296 | struct mddev *mddev; |
1da177e4 LT |
2297 | char b[BDEVNAME_SIZE]; |
2298 | ||
2299 | printk("\n"); | |
2300 | printk("md: **********************************\n"); | |
2301 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2302 | printk("md: **********************************\n"); | |
29ac4aa3 | 2303 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2304 | |
32a7627c N |
2305 | if (mddev->bitmap) |
2306 | bitmap_print_sb(mddev->bitmap); | |
2307 | else | |
2308 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2309 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2310 | printk("<%s>", bdevname(rdev->bdev,b)); |
2311 | printk("\n"); | |
2312 | ||
159ec1fc | 2313 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2314 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2315 | } |
2316 | printk("md: **********************************\n"); | |
2317 | printk("\n"); | |
2318 | } | |
2319 | ||
2320 | ||
fd01b88c | 2321 | static void sync_sbs(struct mddev * mddev, int nospares) |
1da177e4 | 2322 | { |
42543769 N |
2323 | /* Update each superblock (in-memory image), but |
2324 | * if we are allowed to, skip spares which already | |
2325 | * have the right event counter, or have one earlier | |
2326 | * (which would mean they aren't being marked as dirty | |
2327 | * with the rest of the array) | |
2328 | */ | |
3cb03002 | 2329 | struct md_rdev *rdev; |
159ec1fc | 2330 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2331 | if (rdev->sb_events == mddev->events || |
2332 | (nospares && | |
2333 | rdev->raid_disk < 0 && | |
42543769 N |
2334 | rdev->sb_events+1 == mddev->events)) { |
2335 | /* Don't update this superblock */ | |
2336 | rdev->sb_loaded = 2; | |
2337 | } else { | |
076f968b | 2338 | sync_super(mddev, rdev); |
42543769 N |
2339 | rdev->sb_loaded = 1; |
2340 | } | |
1da177e4 LT |
2341 | } |
2342 | } | |
2343 | ||
fd01b88c | 2344 | static void md_update_sb(struct mddev * mddev, int force_change) |
1da177e4 | 2345 | { |
3cb03002 | 2346 | struct md_rdev *rdev; |
06d91a5f | 2347 | int sync_req; |
42543769 | 2348 | int nospares = 0; |
2699b672 | 2349 | int any_badblocks_changed = 0; |
1da177e4 | 2350 | |
1da177e4 | 2351 | repeat: |
3a3a5ddb N |
2352 | /* First make sure individual recovery_offsets are correct */ |
2353 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2354 | if (rdev->raid_disk >= 0 && | |
2355 | mddev->delta_disks >= 0 && | |
2356 | !test_bit(In_sync, &rdev->flags) && | |
2357 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2358 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2359 | ||
2360 | } | |
bd52b746 | 2361 | if (!mddev->persistent) { |
070dc6dd | 2362 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2363 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
de393cde | 2364 | if (!mddev->external) { |
d97a41dc | 2365 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
de393cde N |
2366 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
2367 | if (rdev->badblocks.changed) { | |
2368 | md_ack_all_badblocks(&rdev->badblocks); | |
2369 | md_error(mddev, rdev); | |
2370 | } | |
2371 | clear_bit(Blocked, &rdev->flags); | |
2372 | clear_bit(BlockedBadBlocks, &rdev->flags); | |
2373 | wake_up(&rdev->blocked_wait); | |
2374 | } | |
2375 | } | |
3a3a5ddb N |
2376 | wake_up(&mddev->sb_wait); |
2377 | return; | |
2378 | } | |
2379 | ||
a9701a30 | 2380 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2381 | |
3a3a5ddb N |
2382 | mddev->utime = get_seconds(); |
2383 | ||
850b2b42 N |
2384 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2385 | force_change = 1; | |
2386 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2387 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2388 | * though if events isn't the right even/odd, we will have to do | |
2389 | * spares after all | |
2390 | */ | |
2391 | nospares = 1; | |
2392 | if (force_change) | |
2393 | nospares = 0; | |
2394 | if (mddev->degraded) | |
84692195 N |
2395 | /* If the array is degraded, then skipping spares is both |
2396 | * dangerous and fairly pointless. | |
2397 | * Dangerous because a device that was removed from the array | |
2398 | * might have a event_count that still looks up-to-date, | |
2399 | * so it can be re-added without a resync. | |
2400 | * Pointless because if there are any spares to skip, | |
2401 | * then a recovery will happen and soon that array won't | |
2402 | * be degraded any more and the spare can go back to sleep then. | |
2403 | */ | |
850b2b42 | 2404 | nospares = 0; |
84692195 | 2405 | |
06d91a5f | 2406 | sync_req = mddev->in_sync; |
42543769 N |
2407 | |
2408 | /* If this is just a dirty<->clean transition, and the array is clean | |
2409 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2410 | if (nospares |
42543769 | 2411 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2412 | && mddev->can_decrease_events |
2413 | && mddev->events != 1) { | |
42543769 | 2414 | mddev->events--; |
a8707c08 N |
2415 | mddev->can_decrease_events = 0; |
2416 | } else { | |
42543769 N |
2417 | /* otherwise we have to go forward and ... */ |
2418 | mddev->events ++; | |
a8707c08 | 2419 | mddev->can_decrease_events = nospares; |
42543769 | 2420 | } |
1da177e4 LT |
2421 | |
2422 | if (!mddev->events) { | |
2423 | /* | |
2424 | * oops, this 64-bit counter should never wrap. | |
2425 | * Either we are in around ~1 trillion A.C., assuming | |
2426 | * 1 reboot per second, or we have a bug: | |
2427 | */ | |
2428 | MD_BUG(); | |
2429 | mddev->events --; | |
2430 | } | |
2699b672 | 2431 | |
de393cde | 2432 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
2699b672 N |
2433 | if (rdev->badblocks.changed) |
2434 | any_badblocks_changed++; | |
de393cde N |
2435 | if (test_bit(Faulty, &rdev->flags)) |
2436 | set_bit(FaultRecorded, &rdev->flags); | |
2437 | } | |
2699b672 | 2438 | |
e691063a | 2439 | sync_sbs(mddev, nospares); |
a9701a30 | 2440 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 | 2441 | |
36a4e1fe N |
2442 | pr_debug("md: updating %s RAID superblock on device (in sync %d)\n", |
2443 | mdname(mddev), mddev->in_sync); | |
1da177e4 | 2444 | |
4ad13663 | 2445 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2446 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 2447 | char b[BDEVNAME_SIZE]; |
36a4e1fe | 2448 | |
42543769 N |
2449 | if (rdev->sb_loaded != 1) |
2450 | continue; /* no noise on spare devices */ | |
1da177e4 | 2451 | |
d70ed2e4 AW |
2452 | if (!test_bit(Faulty, &rdev->flags) && |
2453 | rdev->saved_raid_disk == -1) { | |
7bfa19f2 | 2454 | md_super_write(mddev,rdev, |
0f420358 | 2455 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 | 2456 | rdev->sb_page); |
36a4e1fe N |
2457 | pr_debug("md: (write) %s's sb offset: %llu\n", |
2458 | bdevname(rdev->bdev, b), | |
2459 | (unsigned long long)rdev->sb_start); | |
42543769 | 2460 | rdev->sb_events = mddev->events; |
2699b672 N |
2461 | if (rdev->badblocks.size) { |
2462 | md_super_write(mddev, rdev, | |
2463 | rdev->badblocks.sector, | |
2464 | rdev->badblocks.size << 9, | |
2465 | rdev->bb_page); | |
2466 | rdev->badblocks.size = 0; | |
2467 | } | |
7bfa19f2 | 2468 | |
d70ed2e4 | 2469 | } else if (test_bit(Faulty, &rdev->flags)) |
36a4e1fe N |
2470 | pr_debug("md: %s (skipping faulty)\n", |
2471 | bdevname(rdev->bdev, b)); | |
d70ed2e4 AW |
2472 | else |
2473 | pr_debug("(skipping incremental s/r "); | |
2474 | ||
7bfa19f2 | 2475 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2476 | /* only need to write one superblock... */ |
2477 | break; | |
2478 | } | |
a9701a30 | 2479 | md_super_wait(mddev); |
850b2b42 | 2480 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2481 | |
a9701a30 | 2482 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2483 | if (mddev->in_sync != sync_req || |
2484 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2485 | /* have to write it out again */ |
a9701a30 | 2486 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2487 | goto repeat; |
2488 | } | |
850b2b42 | 2489 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2490 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2491 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2492 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2493 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2494 | |
de393cde N |
2495 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
2496 | if (test_and_clear_bit(FaultRecorded, &rdev->flags)) | |
2497 | clear_bit(Blocked, &rdev->flags); | |
2498 | ||
2499 | if (any_badblocks_changed) | |
2699b672 | 2500 | md_ack_all_badblocks(&rdev->badblocks); |
de393cde N |
2501 | clear_bit(BlockedBadBlocks, &rdev->flags); |
2502 | wake_up(&rdev->blocked_wait); | |
2503 | } | |
1da177e4 LT |
2504 | } |
2505 | ||
7f6ce769 | 2506 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2507 | * We want to accept with case. For this we use cmd_match. |
2508 | */ | |
2509 | static int cmd_match(const char *cmd, const char *str) | |
2510 | { | |
2511 | /* See if cmd, written into a sysfs file, matches | |
2512 | * str. They must either be the same, or cmd can | |
2513 | * have a trailing newline | |
2514 | */ | |
2515 | while (*cmd && *str && *cmd == *str) { | |
2516 | cmd++; | |
2517 | str++; | |
2518 | } | |
2519 | if (*cmd == '\n') | |
2520 | cmd++; | |
2521 | if (*str || *cmd) | |
2522 | return 0; | |
2523 | return 1; | |
2524 | } | |
2525 | ||
86e6ffdd N |
2526 | struct rdev_sysfs_entry { |
2527 | struct attribute attr; | |
3cb03002 N |
2528 | ssize_t (*show)(struct md_rdev *, char *); |
2529 | ssize_t (*store)(struct md_rdev *, const char *, size_t); | |
86e6ffdd N |
2530 | }; |
2531 | ||
2532 | static ssize_t | |
3cb03002 | 2533 | state_show(struct md_rdev *rdev, char *page) |
86e6ffdd N |
2534 | { |
2535 | char *sep = ""; | |
20a49ff6 | 2536 | size_t len = 0; |
86e6ffdd | 2537 | |
de393cde N |
2538 | if (test_bit(Faulty, &rdev->flags) || |
2539 | rdev->badblocks.unacked_exist) { | |
86e6ffdd N |
2540 | len+= sprintf(page+len, "%sfaulty",sep); |
2541 | sep = ","; | |
2542 | } | |
b2d444d7 | 2543 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2544 | len += sprintf(page+len, "%sin_sync",sep); |
2545 | sep = ","; | |
2546 | } | |
f655675b N |
2547 | if (test_bit(WriteMostly, &rdev->flags)) { |
2548 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2549 | sep = ","; | |
2550 | } | |
de393cde N |
2551 | if (test_bit(Blocked, &rdev->flags) || |
2552 | rdev->badblocks.unacked_exist) { | |
6bfe0b49 DW |
2553 | len += sprintf(page+len, "%sblocked", sep); |
2554 | sep = ","; | |
2555 | } | |
b2d444d7 N |
2556 | if (!test_bit(Faulty, &rdev->flags) && |
2557 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2558 | len += sprintf(page+len, "%sspare", sep); |
2559 | sep = ","; | |
2560 | } | |
d7a9d443 N |
2561 | if (test_bit(WriteErrorSeen, &rdev->flags)) { |
2562 | len += sprintf(page+len, "%swrite_error", sep); | |
2563 | sep = ","; | |
2564 | } | |
86e6ffdd N |
2565 | return len+sprintf(page+len, "\n"); |
2566 | } | |
2567 | ||
45dc2de1 | 2568 | static ssize_t |
3cb03002 | 2569 | state_store(struct md_rdev *rdev, const char *buf, size_t len) |
45dc2de1 N |
2570 | { |
2571 | /* can write | |
de393cde | 2572 | * faulty - simulates an error |
45dc2de1 | 2573 | * remove - disconnects the device |
f655675b N |
2574 | * writemostly - sets write_mostly |
2575 | * -writemostly - clears write_mostly | |
de393cde N |
2576 | * blocked - sets the Blocked flags |
2577 | * -blocked - clears the Blocked and possibly simulates an error | |
6d56e278 | 2578 | * insync - sets Insync providing device isn't active |
d7a9d443 N |
2579 | * write_error - sets WriteErrorSeen |
2580 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2581 | */ |
2582 | int err = -EINVAL; | |
2583 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2584 | md_error(rdev->mddev, rdev); | |
5ef56c8f N |
2585 | if (test_bit(Faulty, &rdev->flags)) |
2586 | err = 0; | |
2587 | else | |
2588 | err = -EBUSY; | |
45dc2de1 N |
2589 | } else if (cmd_match(buf, "remove")) { |
2590 | if (rdev->raid_disk >= 0) | |
2591 | err = -EBUSY; | |
2592 | else { | |
fd01b88c | 2593 | struct mddev *mddev = rdev->mddev; |
45dc2de1 | 2594 | kick_rdev_from_array(rdev); |
3f9d7b0d N |
2595 | if (mddev->pers) |
2596 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2597 | md_new_event(mddev); |
2598 | err = 0; | |
2599 | } | |
f655675b N |
2600 | } else if (cmd_match(buf, "writemostly")) { |
2601 | set_bit(WriteMostly, &rdev->flags); | |
2602 | err = 0; | |
2603 | } else if (cmd_match(buf, "-writemostly")) { | |
2604 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2605 | err = 0; |
2606 | } else if (cmd_match(buf, "blocked")) { | |
2607 | set_bit(Blocked, &rdev->flags); | |
2608 | err = 0; | |
2609 | } else if (cmd_match(buf, "-blocked")) { | |
de393cde | 2610 | if (!test_bit(Faulty, &rdev->flags) && |
7da64a0a | 2611 | rdev->badblocks.unacked_exist) { |
de393cde N |
2612 | /* metadata handler doesn't understand badblocks, |
2613 | * so we need to fail the device | |
2614 | */ | |
2615 | md_error(rdev->mddev, rdev); | |
2616 | } | |
6bfe0b49 | 2617 | clear_bit(Blocked, &rdev->flags); |
de393cde | 2618 | clear_bit(BlockedBadBlocks, &rdev->flags); |
6bfe0b49 DW |
2619 | wake_up(&rdev->blocked_wait); |
2620 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2621 | md_wakeup_thread(rdev->mddev->thread); | |
2622 | ||
6d56e278 N |
2623 | err = 0; |
2624 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2625 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2626 | err = 0; |
d7a9d443 N |
2627 | } else if (cmd_match(buf, "write_error")) { |
2628 | set_bit(WriteErrorSeen, &rdev->flags); | |
2629 | err = 0; | |
2630 | } else if (cmd_match(buf, "-write_error")) { | |
2631 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2632 | err = 0; | |
45dc2de1 | 2633 | } |
00bcb4ac N |
2634 | if (!err) |
2635 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2636 | return err ? err : len; |
2637 | } | |
80ca3a44 N |
2638 | static struct rdev_sysfs_entry rdev_state = |
2639 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2640 | |
4dbcdc75 | 2641 | static ssize_t |
3cb03002 | 2642 | errors_show(struct md_rdev *rdev, char *page) |
4dbcdc75 N |
2643 | { |
2644 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2645 | } | |
2646 | ||
2647 | static ssize_t | |
3cb03002 | 2648 | errors_store(struct md_rdev *rdev, const char *buf, size_t len) |
4dbcdc75 N |
2649 | { |
2650 | char *e; | |
2651 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2652 | if (*buf && (*e == 0 || *e == '\n')) { | |
2653 | atomic_set(&rdev->corrected_errors, n); | |
2654 | return len; | |
2655 | } | |
2656 | return -EINVAL; | |
2657 | } | |
2658 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2659 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2660 | |
014236d2 | 2661 | static ssize_t |
3cb03002 | 2662 | slot_show(struct md_rdev *rdev, char *page) |
014236d2 N |
2663 | { |
2664 | if (rdev->raid_disk < 0) | |
2665 | return sprintf(page, "none\n"); | |
2666 | else | |
2667 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2668 | } | |
2669 | ||
2670 | static ssize_t | |
3cb03002 | 2671 | slot_store(struct md_rdev *rdev, const char *buf, size_t len) |
014236d2 N |
2672 | { |
2673 | char *e; | |
c303da6d | 2674 | int err; |
014236d2 N |
2675 | int slot = simple_strtoul(buf, &e, 10); |
2676 | if (strncmp(buf, "none", 4)==0) | |
2677 | slot = -1; | |
2678 | else if (e==buf || (*e && *e!= '\n')) | |
2679 | return -EINVAL; | |
6c2fce2e | 2680 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2681 | /* Setting 'slot' on an active array requires also |
2682 | * updating the 'rd%d' link, and communicating | |
2683 | * with the personality with ->hot_*_disk. | |
2684 | * For now we only support removing | |
2685 | * failed/spare devices. This normally happens automatically, | |
2686 | * but not when the metadata is externally managed. | |
2687 | */ | |
c303da6d N |
2688 | if (rdev->raid_disk == -1) |
2689 | return -EEXIST; | |
2690 | /* personality does all needed checks */ | |
01393f3d | 2691 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d N |
2692 | return -EINVAL; |
2693 | err = rdev->mddev->pers-> | |
2694 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2695 | if (err) | |
2696 | return err; | |
36fad858 | 2697 | sysfs_unlink_rdev(rdev->mddev, rdev); |
b7103107 | 2698 | rdev->raid_disk = -1; |
c303da6d N |
2699 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2700 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e | 2701 | } else if (rdev->mddev->pers) { |
3cb03002 | 2702 | struct md_rdev *rdev2; |
6c2fce2e | 2703 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2704 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2705 | */ |
2706 | ||
2707 | if (rdev->raid_disk != -1) | |
2708 | return -EBUSY; | |
2709 | ||
c6751b2b N |
2710 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2711 | return -EBUSY; | |
2712 | ||
6c2fce2e NB |
2713 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2714 | return -EINVAL; | |
2715 | ||
159ec1fc | 2716 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2717 | if (rdev2->raid_disk == slot) |
2718 | return -EEXIST; | |
2719 | ||
ba1b41b6 N |
2720 | if (slot >= rdev->mddev->raid_disks && |
2721 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2722 | return -ENOSPC; | |
2723 | ||
6c2fce2e NB |
2724 | rdev->raid_disk = slot; |
2725 | if (test_bit(In_sync, &rdev->flags)) | |
2726 | rdev->saved_raid_disk = slot; | |
2727 | else | |
2728 | rdev->saved_raid_disk = -1; | |
d30519fc | 2729 | clear_bit(In_sync, &rdev->flags); |
6c2fce2e NB |
2730 | err = rdev->mddev->pers-> |
2731 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2732 | if (err) { |
6c2fce2e | 2733 | rdev->raid_disk = -1; |
6c2fce2e | 2734 | return err; |
52664732 | 2735 | } else |
00bcb4ac | 2736 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2737 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2738 | /* failure here is OK */; |
6c2fce2e | 2739 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2740 | } else { |
ba1b41b6 N |
2741 | if (slot >= rdev->mddev->raid_disks && |
2742 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2743 | return -ENOSPC; |
2744 | rdev->raid_disk = slot; | |
2745 | /* assume it is working */ | |
c5d79adb N |
2746 | clear_bit(Faulty, &rdev->flags); |
2747 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2748 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2749 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2750 | } |
014236d2 N |
2751 | return len; |
2752 | } | |
2753 | ||
2754 | ||
2755 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2756 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2757 | |
93c8cad0 | 2758 | static ssize_t |
3cb03002 | 2759 | offset_show(struct md_rdev *rdev, char *page) |
93c8cad0 | 2760 | { |
6961ece4 | 2761 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2762 | } |
2763 | ||
2764 | static ssize_t | |
3cb03002 | 2765 | offset_store(struct md_rdev *rdev, const char *buf, size_t len) |
93c8cad0 N |
2766 | { |
2767 | char *e; | |
2768 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2769 | if (e==buf || (*e && *e != '\n')) | |
2770 | return -EINVAL; | |
8ed0a521 | 2771 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2772 | return -EBUSY; |
dd8ac336 | 2773 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2774 | /* Must set offset before size, so overlap checks |
2775 | * can be sane */ | |
2776 | return -EBUSY; | |
93c8cad0 N |
2777 | rdev->data_offset = offset; |
2778 | return len; | |
2779 | } | |
2780 | ||
2781 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2782 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2783 | |
83303b61 | 2784 | static ssize_t |
3cb03002 | 2785 | rdev_size_show(struct md_rdev *rdev, char *page) |
83303b61 | 2786 | { |
dd8ac336 | 2787 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2788 | } |
2789 | ||
c5d79adb N |
2790 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2791 | { | |
2792 | /* check if two start/length pairs overlap */ | |
2793 | if (s1+l1 <= s2) | |
2794 | return 0; | |
2795 | if (s2+l2 <= s1) | |
2796 | return 0; | |
2797 | return 1; | |
2798 | } | |
2799 | ||
b522adcd DW |
2800 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2801 | { | |
2802 | unsigned long long blocks; | |
2803 | sector_t new; | |
2804 | ||
2805 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2806 | return -EINVAL; | |
2807 | ||
2808 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2809 | return -EINVAL; /* sector conversion overflow */ | |
2810 | ||
2811 | new = blocks * 2; | |
2812 | if (new != blocks * 2) | |
2813 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2814 | ||
2815 | *sectors = new; | |
2816 | return 0; | |
2817 | } | |
2818 | ||
83303b61 | 2819 | static ssize_t |
3cb03002 | 2820 | rdev_size_store(struct md_rdev *rdev, const char *buf, size_t len) |
83303b61 | 2821 | { |
fd01b88c | 2822 | struct mddev *my_mddev = rdev->mddev; |
dd8ac336 | 2823 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2824 | sector_t sectors; |
27c529bb | 2825 | |
b522adcd | 2826 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2827 | return -EINVAL; |
0cd17fec | 2828 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2829 | if (my_mddev->persistent) { |
dd8ac336 AN |
2830 | sectors = super_types[my_mddev->major_version]. |
2831 | rdev_size_change(rdev, sectors); | |
2832 | if (!sectors) | |
0cd17fec | 2833 | return -EBUSY; |
dd8ac336 | 2834 | } else if (!sectors) |
77304d2a | 2835 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2836 | rdev->data_offset; |
0cd17fec | 2837 | } |
dd8ac336 | 2838 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2839 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2840 | |
dd8ac336 AN |
2841 | rdev->sectors = sectors; |
2842 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2843 | /* need to check that all other rdevs with the same ->bdev |
2844 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2845 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2846 | * we have to change it back, we will have the lock again. |
2847 | */ | |
fd01b88c | 2848 | struct mddev *mddev; |
c5d79adb | 2849 | int overlap = 0; |
159ec1fc | 2850 | struct list_head *tmp; |
c5d79adb | 2851 | |
27c529bb | 2852 | mddev_unlock(my_mddev); |
29ac4aa3 | 2853 | for_each_mddev(mddev, tmp) { |
3cb03002 | 2854 | struct md_rdev *rdev2; |
c5d79adb N |
2855 | |
2856 | mddev_lock(mddev); | |
159ec1fc | 2857 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
f21e9ff7 N |
2858 | if (rdev->bdev == rdev2->bdev && |
2859 | rdev != rdev2 && | |
2860 | overlaps(rdev->data_offset, rdev->sectors, | |
2861 | rdev2->data_offset, | |
2862 | rdev2->sectors)) { | |
c5d79adb N |
2863 | overlap = 1; |
2864 | break; | |
2865 | } | |
2866 | mddev_unlock(mddev); | |
2867 | if (overlap) { | |
2868 | mddev_put(mddev); | |
2869 | break; | |
2870 | } | |
2871 | } | |
27c529bb | 2872 | mddev_lock(my_mddev); |
c5d79adb N |
2873 | if (overlap) { |
2874 | /* Someone else could have slipped in a size | |
2875 | * change here, but doing so is just silly. | |
dd8ac336 | 2876 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2877 | * safe, and trust userspace not to race with |
2878 | * itself | |
2879 | */ | |
dd8ac336 | 2880 | rdev->sectors = oldsectors; |
c5d79adb N |
2881 | return -EBUSY; |
2882 | } | |
2883 | } | |
83303b61 N |
2884 | return len; |
2885 | } | |
2886 | ||
2887 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2888 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2889 | |
06e3c817 | 2890 | |
3cb03002 | 2891 | static ssize_t recovery_start_show(struct md_rdev *rdev, char *page) |
06e3c817 DW |
2892 | { |
2893 | unsigned long long recovery_start = rdev->recovery_offset; | |
2894 | ||
2895 | if (test_bit(In_sync, &rdev->flags) || | |
2896 | recovery_start == MaxSector) | |
2897 | return sprintf(page, "none\n"); | |
2898 | ||
2899 | return sprintf(page, "%llu\n", recovery_start); | |
2900 | } | |
2901 | ||
3cb03002 | 2902 | static ssize_t recovery_start_store(struct md_rdev *rdev, const char *buf, size_t len) |
06e3c817 DW |
2903 | { |
2904 | unsigned long long recovery_start; | |
2905 | ||
2906 | if (cmd_match(buf, "none")) | |
2907 | recovery_start = MaxSector; | |
2908 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2909 | return -EINVAL; | |
2910 | ||
2911 | if (rdev->mddev->pers && | |
2912 | rdev->raid_disk >= 0) | |
2913 | return -EBUSY; | |
2914 | ||
2915 | rdev->recovery_offset = recovery_start; | |
2916 | if (recovery_start == MaxSector) | |
2917 | set_bit(In_sync, &rdev->flags); | |
2918 | else | |
2919 | clear_bit(In_sync, &rdev->flags); | |
2920 | return len; | |
2921 | } | |
2922 | ||
2923 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2924 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2925 | ||
16c791a5 N |
2926 | |
2927 | static ssize_t | |
2928 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2929 | static ssize_t | |
2930 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2931 | ||
3cb03002 | 2932 | static ssize_t bb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2933 | { |
2934 | return badblocks_show(&rdev->badblocks, page, 0); | |
2935 | } | |
3cb03002 | 2936 | static ssize_t bb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 | 2937 | { |
de393cde N |
2938 | int rv = badblocks_store(&rdev->badblocks, page, len, 0); |
2939 | /* Maybe that ack was all we needed */ | |
2940 | if (test_and_clear_bit(BlockedBadBlocks, &rdev->flags)) | |
2941 | wake_up(&rdev->blocked_wait); | |
2942 | return rv; | |
16c791a5 N |
2943 | } |
2944 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2945 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2946 | ||
2947 | ||
3cb03002 | 2948 | static ssize_t ubb_show(struct md_rdev *rdev, char *page) |
16c791a5 N |
2949 | { |
2950 | return badblocks_show(&rdev->badblocks, page, 1); | |
2951 | } | |
3cb03002 | 2952 | static ssize_t ubb_store(struct md_rdev *rdev, const char *page, size_t len) |
16c791a5 N |
2953 | { |
2954 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2955 | } | |
2956 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
2957 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
2958 | ||
86e6ffdd N |
2959 | static struct attribute *rdev_default_attrs[] = { |
2960 | &rdev_state.attr, | |
4dbcdc75 | 2961 | &rdev_errors.attr, |
014236d2 | 2962 | &rdev_slot.attr, |
93c8cad0 | 2963 | &rdev_offset.attr, |
83303b61 | 2964 | &rdev_size.attr, |
06e3c817 | 2965 | &rdev_recovery_start.attr, |
16c791a5 N |
2966 | &rdev_bad_blocks.attr, |
2967 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
2968 | NULL, |
2969 | }; | |
2970 | static ssize_t | |
2971 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2972 | { | |
2973 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2974 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
fd01b88c | 2975 | struct mddev *mddev = rdev->mddev; |
27c529bb | 2976 | ssize_t rv; |
86e6ffdd N |
2977 | |
2978 | if (!entry->show) | |
2979 | return -EIO; | |
27c529bb N |
2980 | |
2981 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2982 | if (!rv) { | |
2983 | if (rdev->mddev == NULL) | |
2984 | rv = -EBUSY; | |
2985 | else | |
2986 | rv = entry->show(rdev, page); | |
2987 | mddev_unlock(mddev); | |
2988 | } | |
2989 | return rv; | |
86e6ffdd N |
2990 | } |
2991 | ||
2992 | static ssize_t | |
2993 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2994 | const char *page, size_t length) | |
2995 | { | |
2996 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
3cb03002 | 2997 | struct md_rdev *rdev = container_of(kobj, struct md_rdev, kobj); |
27c529bb | 2998 | ssize_t rv; |
fd01b88c | 2999 | struct mddev *mddev = rdev->mddev; |
86e6ffdd N |
3000 | |
3001 | if (!entry->store) | |
3002 | return -EIO; | |
67463acb N |
3003 | if (!capable(CAP_SYS_ADMIN)) |
3004 | return -EACCES; | |
27c529bb | 3005 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 3006 | if (!rv) { |
27c529bb N |
3007 | if (rdev->mddev == NULL) |
3008 | rv = -EBUSY; | |
3009 | else | |
3010 | rv = entry->store(rdev, page, length); | |
6a51830e | 3011 | mddev_unlock(mddev); |
ca388059 N |
3012 | } |
3013 | return rv; | |
86e6ffdd N |
3014 | } |
3015 | ||
3016 | static void rdev_free(struct kobject *ko) | |
3017 | { | |
3cb03002 | 3018 | struct md_rdev *rdev = container_of(ko, struct md_rdev, kobj); |
86e6ffdd N |
3019 | kfree(rdev); |
3020 | } | |
52cf25d0 | 3021 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
3022 | .show = rdev_attr_show, |
3023 | .store = rdev_attr_store, | |
3024 | }; | |
3025 | static struct kobj_type rdev_ktype = { | |
3026 | .release = rdev_free, | |
3027 | .sysfs_ops = &rdev_sysfs_ops, | |
3028 | .default_attrs = rdev_default_attrs, | |
3029 | }; | |
3030 | ||
3cb03002 | 3031 | int md_rdev_init(struct md_rdev *rdev) |
e8bb9a83 N |
3032 | { |
3033 | rdev->desc_nr = -1; | |
3034 | rdev->saved_raid_disk = -1; | |
3035 | rdev->raid_disk = -1; | |
3036 | rdev->flags = 0; | |
3037 | rdev->data_offset = 0; | |
3038 | rdev->sb_events = 0; | |
3039 | rdev->last_read_error.tv_sec = 0; | |
3040 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
3041 | rdev->sb_loaded = 0; |
3042 | rdev->bb_page = NULL; | |
e8bb9a83 N |
3043 | atomic_set(&rdev->nr_pending, 0); |
3044 | atomic_set(&rdev->read_errors, 0); | |
3045 | atomic_set(&rdev->corrected_errors, 0); | |
3046 | ||
3047 | INIT_LIST_HEAD(&rdev->same_set); | |
3048 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
3049 | |
3050 | /* Add space to store bad block list. | |
3051 | * This reserves the space even on arrays where it cannot | |
3052 | * be used - I wonder if that matters | |
3053 | */ | |
3054 | rdev->badblocks.count = 0; | |
3055 | rdev->badblocks.shift = 0; | |
3056 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
3057 | seqlock_init(&rdev->badblocks.lock); | |
3058 | if (rdev->badblocks.page == NULL) | |
3059 | return -ENOMEM; | |
3060 | ||
3061 | return 0; | |
e8bb9a83 N |
3062 | } |
3063 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3064 | /* |
3065 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3066 | * | |
3067 | * mark the device faulty if: | |
3068 | * | |
3069 | * - the device is nonexistent (zero size) | |
3070 | * - the device has no valid superblock | |
3071 | * | |
3072 | * a faulty rdev _never_ has rdev->sb set. | |
3073 | */ | |
3cb03002 | 3074 | static struct md_rdev *md_import_device(dev_t newdev, int super_format, int super_minor) |
1da177e4 LT |
3075 | { |
3076 | char b[BDEVNAME_SIZE]; | |
3077 | int err; | |
3cb03002 | 3078 | struct md_rdev *rdev; |
1da177e4 LT |
3079 | sector_t size; |
3080 | ||
9ffae0cf | 3081 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3082 | if (!rdev) { |
3083 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3084 | return ERR_PTR(-ENOMEM); | |
3085 | } | |
1da177e4 | 3086 | |
2230dfe4 N |
3087 | err = md_rdev_init(rdev); |
3088 | if (err) | |
3089 | goto abort_free; | |
3090 | err = alloc_disk_sb(rdev); | |
3091 | if (err) | |
1da177e4 LT |
3092 | goto abort_free; |
3093 | ||
c5d79adb | 3094 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3095 | if (err) |
3096 | goto abort_free; | |
3097 | ||
f9cb074b | 3098 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3099 | |
77304d2a | 3100 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 LT |
3101 | if (!size) { |
3102 | printk(KERN_WARNING | |
3103 | "md: %s has zero or unknown size, marking faulty!\n", | |
3104 | bdevname(rdev->bdev,b)); | |
3105 | err = -EINVAL; | |
3106 | goto abort_free; | |
3107 | } | |
3108 | ||
3109 | if (super_format >= 0) { | |
3110 | err = super_types[super_format]. | |
3111 | load_super(rdev, NULL, super_minor); | |
3112 | if (err == -EINVAL) { | |
df968c4e N |
3113 | printk(KERN_WARNING |
3114 | "md: %s does not have a valid v%d.%d " | |
3115 | "superblock, not importing!\n", | |
3116 | bdevname(rdev->bdev,b), | |
3117 | super_format, super_minor); | |
1da177e4 LT |
3118 | goto abort_free; |
3119 | } | |
3120 | if (err < 0) { | |
3121 | printk(KERN_WARNING | |
3122 | "md: could not read %s's sb, not importing!\n", | |
3123 | bdevname(rdev->bdev,b)); | |
3124 | goto abort_free; | |
3125 | } | |
3126 | } | |
9f2f3830 N |
3127 | if (super_format == -1) |
3128 | /* hot-add for 0.90, or non-persistent: so no badblocks */ | |
3129 | rdev->badblocks.shift = -1; | |
6bfe0b49 | 3130 | |
1da177e4 LT |
3131 | return rdev; |
3132 | ||
3133 | abort_free: | |
2699b672 N |
3134 | if (rdev->bdev) |
3135 | unlock_rdev(rdev); | |
3136 | free_disk_sb(rdev); | |
2230dfe4 | 3137 | kfree(rdev->badblocks.page); |
1da177e4 LT |
3138 | kfree(rdev); |
3139 | return ERR_PTR(err); | |
3140 | } | |
3141 | ||
3142 | /* | |
3143 | * Check a full RAID array for plausibility | |
3144 | */ | |
3145 | ||
3146 | ||
fd01b88c | 3147 | static void analyze_sbs(struct mddev * mddev) |
1da177e4 LT |
3148 | { |
3149 | int i; | |
3cb03002 | 3150 | struct md_rdev *rdev, *freshest, *tmp; |
1da177e4 LT |
3151 | char b[BDEVNAME_SIZE]; |
3152 | ||
3153 | freshest = NULL; | |
d089c6af | 3154 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
3155 | switch (super_types[mddev->major_version]. |
3156 | load_super(rdev, freshest, mddev->minor_version)) { | |
3157 | case 1: | |
3158 | freshest = rdev; | |
3159 | break; | |
3160 | case 0: | |
3161 | break; | |
3162 | default: | |
3163 | printk( KERN_ERR \ | |
3164 | "md: fatal superblock inconsistency in %s" | |
3165 | " -- removing from array\n", | |
3166 | bdevname(rdev->bdev,b)); | |
3167 | kick_rdev_from_array(rdev); | |
3168 | } | |
3169 | ||
3170 | ||
3171 | super_types[mddev->major_version]. | |
3172 | validate_super(mddev, freshest); | |
3173 | ||
3174 | i = 0; | |
d089c6af | 3175 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
3176 | if (mddev->max_disks && |
3177 | (rdev->desc_nr >= mddev->max_disks || | |
3178 | i > mddev->max_disks)) { | |
de01dfad N |
3179 | printk(KERN_WARNING |
3180 | "md: %s: %s: only %d devices permitted\n", | |
3181 | mdname(mddev), bdevname(rdev->bdev, b), | |
3182 | mddev->max_disks); | |
3183 | kick_rdev_from_array(rdev); | |
3184 | continue; | |
3185 | } | |
1da177e4 LT |
3186 | if (rdev != freshest) |
3187 | if (super_types[mddev->major_version]. | |
3188 | validate_super(mddev, rdev)) { | |
3189 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3190 | " from array!\n", | |
3191 | bdevname(rdev->bdev,b)); | |
3192 | kick_rdev_from_array(rdev); | |
3193 | continue; | |
3194 | } | |
3195 | if (mddev->level == LEVEL_MULTIPATH) { | |
3196 | rdev->desc_nr = i++; | |
3197 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3198 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3199 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3200 | rdev->raid_disk = -1; |
3201 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3202 | } |
3203 | } | |
1da177e4 LT |
3204 | } |
3205 | ||
72e02075 N |
3206 | /* Read a fixed-point number. |
3207 | * Numbers in sysfs attributes should be in "standard" units where | |
3208 | * possible, so time should be in seconds. | |
3209 | * However we internally use a a much smaller unit such as | |
3210 | * milliseconds or jiffies. | |
3211 | * This function takes a decimal number with a possible fractional | |
3212 | * component, and produces an integer which is the result of | |
3213 | * multiplying that number by 10^'scale'. | |
3214 | * all without any floating-point arithmetic. | |
3215 | */ | |
3216 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3217 | { | |
3218 | unsigned long result = 0; | |
3219 | long decimals = -1; | |
3220 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3221 | if (*cp == '.') | |
3222 | decimals = 0; | |
3223 | else if (decimals < scale) { | |
3224 | unsigned int value; | |
3225 | value = *cp - '0'; | |
3226 | result = result * 10 + value; | |
3227 | if (decimals >= 0) | |
3228 | decimals++; | |
3229 | } | |
3230 | cp++; | |
3231 | } | |
3232 | if (*cp == '\n') | |
3233 | cp++; | |
3234 | if (*cp) | |
3235 | return -EINVAL; | |
3236 | if (decimals < 0) | |
3237 | decimals = 0; | |
3238 | while (decimals < scale) { | |
3239 | result *= 10; | |
3240 | decimals ++; | |
3241 | } | |
3242 | *res = result; | |
3243 | return 0; | |
3244 | } | |
3245 | ||
3246 | ||
19052c0e N |
3247 | static void md_safemode_timeout(unsigned long data); |
3248 | ||
16f17b39 | 3249 | static ssize_t |
fd01b88c | 3250 | safe_delay_show(struct mddev *mddev, char *page) |
16f17b39 N |
3251 | { |
3252 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3253 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3254 | } | |
3255 | static ssize_t | |
fd01b88c | 3256 | safe_delay_store(struct mddev *mddev, const char *cbuf, size_t len) |
16f17b39 | 3257 | { |
16f17b39 | 3258 | unsigned long msec; |
97ce0a7f | 3259 | |
72e02075 | 3260 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3261 | return -EINVAL; |
16f17b39 N |
3262 | if (msec == 0) |
3263 | mddev->safemode_delay = 0; | |
3264 | else { | |
19052c0e | 3265 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
3266 | mddev->safemode_delay = (msec*HZ)/1000; |
3267 | if (mddev->safemode_delay == 0) | |
3268 | mddev->safemode_delay = 1; | |
19052c0e N |
3269 | if (mddev->safemode_delay < old_delay) |
3270 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
3271 | } |
3272 | return len; | |
3273 | } | |
3274 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3275 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3276 | |
eae1701f | 3277 | static ssize_t |
fd01b88c | 3278 | level_show(struct mddev *mddev, char *page) |
eae1701f | 3279 | { |
84fc4b56 | 3280 | struct md_personality *p = mddev->pers; |
d9d166c2 | 3281 | if (p) |
eae1701f | 3282 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
3283 | else if (mddev->clevel[0]) |
3284 | return sprintf(page, "%s\n", mddev->clevel); | |
3285 | else if (mddev->level != LEVEL_NONE) | |
3286 | return sprintf(page, "%d\n", mddev->level); | |
3287 | else | |
3288 | return 0; | |
eae1701f N |
3289 | } |
3290 | ||
d9d166c2 | 3291 | static ssize_t |
fd01b88c | 3292 | level_store(struct mddev *mddev, const char *buf, size_t len) |
d9d166c2 | 3293 | { |
f2859af6 | 3294 | char clevel[16]; |
20a49ff6 | 3295 | ssize_t rv = len; |
84fc4b56 | 3296 | struct md_personality *pers; |
f2859af6 | 3297 | long level; |
245f46c2 | 3298 | void *priv; |
3cb03002 | 3299 | struct md_rdev *rdev; |
245f46c2 N |
3300 | |
3301 | if (mddev->pers == NULL) { | |
3302 | if (len == 0) | |
3303 | return 0; | |
3304 | if (len >= sizeof(mddev->clevel)) | |
3305 | return -ENOSPC; | |
3306 | strncpy(mddev->clevel, buf, len); | |
3307 | if (mddev->clevel[len-1] == '\n') | |
3308 | len--; | |
3309 | mddev->clevel[len] = 0; | |
3310 | mddev->level = LEVEL_NONE; | |
3311 | return rv; | |
3312 | } | |
3313 | ||
3314 | /* request to change the personality. Need to ensure: | |
3315 | * - array is not engaged in resync/recovery/reshape | |
3316 | * - old personality can be suspended | |
3317 | * - new personality will access other array. | |
3318 | */ | |
3319 | ||
bb4f1e9d N |
3320 | if (mddev->sync_thread || |
3321 | mddev->reshape_position != MaxSector || | |
3322 | mddev->sysfs_active) | |
d9d166c2 | 3323 | return -EBUSY; |
245f46c2 N |
3324 | |
3325 | if (!mddev->pers->quiesce) { | |
3326 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3327 | mdname(mddev), mddev->pers->name); | |
3328 | return -EINVAL; | |
3329 | } | |
3330 | ||
3331 | /* Now find the new personality */ | |
f2859af6 | 3332 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3333 | return -EINVAL; |
f2859af6 DW |
3334 | strncpy(clevel, buf, len); |
3335 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3336 | len--; |
f2859af6 DW |
3337 | clevel[len] = 0; |
3338 | if (strict_strtol(clevel, 10, &level)) | |
3339 | level = LEVEL_NONE; | |
245f46c2 | 3340 | |
f2859af6 DW |
3341 | if (request_module("md-%s", clevel) != 0) |
3342 | request_module("md-level-%s", clevel); | |
245f46c2 | 3343 | spin_lock(&pers_lock); |
f2859af6 | 3344 | pers = find_pers(level, clevel); |
245f46c2 N |
3345 | if (!pers || !try_module_get(pers->owner)) { |
3346 | spin_unlock(&pers_lock); | |
f2859af6 | 3347 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3348 | return -EINVAL; |
3349 | } | |
3350 | spin_unlock(&pers_lock); | |
3351 | ||
3352 | if (pers == mddev->pers) { | |
3353 | /* Nothing to do! */ | |
3354 | module_put(pers->owner); | |
3355 | return rv; | |
3356 | } | |
3357 | if (!pers->takeover) { | |
3358 | module_put(pers->owner); | |
3359 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3360 | mdname(mddev), clevel); |
245f46c2 N |
3361 | return -EINVAL; |
3362 | } | |
3363 | ||
e93f68a1 N |
3364 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3365 | rdev->new_raid_disk = rdev->raid_disk; | |
3366 | ||
245f46c2 N |
3367 | /* ->takeover must set new_* and/or delta_disks |
3368 | * if it succeeds, and may set them when it fails. | |
3369 | */ | |
3370 | priv = pers->takeover(mddev); | |
3371 | if (IS_ERR(priv)) { | |
3372 | mddev->new_level = mddev->level; | |
3373 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3374 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3375 | mddev->raid_disks -= mddev->delta_disks; |
3376 | mddev->delta_disks = 0; | |
3377 | module_put(pers->owner); | |
3378 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3379 | mdname(mddev), clevel); |
245f46c2 N |
3380 | return PTR_ERR(priv); |
3381 | } | |
3382 | ||
3383 | /* Looks like we have a winner */ | |
3384 | mddev_suspend(mddev); | |
3385 | mddev->pers->stop(mddev); | |
a64c876f N |
3386 | |
3387 | if (mddev->pers->sync_request == NULL && | |
3388 | pers->sync_request != NULL) { | |
3389 | /* need to add the md_redundancy_group */ | |
3390 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3391 | printk(KERN_WARNING | |
3392 | "md: cannot register extra attributes for %s\n", | |
3393 | mdname(mddev)); | |
19fdb9ee | 3394 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3395 | } |
3396 | if (mddev->pers->sync_request != NULL && | |
3397 | pers->sync_request == NULL) { | |
3398 | /* need to remove the md_redundancy_group */ | |
3399 | if (mddev->to_remove == NULL) | |
3400 | mddev->to_remove = &md_redundancy_group; | |
3401 | } | |
3402 | ||
54071b38 TM |
3403 | if (mddev->pers->sync_request == NULL && |
3404 | mddev->external) { | |
3405 | /* We are converting from a no-redundancy array | |
3406 | * to a redundancy array and metadata is managed | |
3407 | * externally so we need to be sure that writes | |
3408 | * won't block due to a need to transition | |
3409 | * clean->dirty | |
3410 | * until external management is started. | |
3411 | */ | |
3412 | mddev->in_sync = 0; | |
3413 | mddev->safemode_delay = 0; | |
3414 | mddev->safemode = 0; | |
3415 | } | |
3416 | ||
e93f68a1 | 3417 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
e93f68a1 N |
3418 | if (rdev->raid_disk < 0) |
3419 | continue; | |
bf2cb0da | 3420 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3421 | rdev->new_raid_disk = -1; |
3422 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3423 | continue; | |
36fad858 | 3424 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 N |
3425 | } |
3426 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3427 | if (rdev->raid_disk < 0) | |
3428 | continue; | |
3429 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3430 | continue; | |
3431 | rdev->raid_disk = rdev->new_raid_disk; | |
3432 | if (rdev->raid_disk < 0) | |
3a981b03 | 3433 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3434 | else { |
36fad858 NK |
3435 | if (sysfs_link_rdev(mddev, rdev)) |
3436 | printk(KERN_WARNING "md: cannot register rd%d" | |
3437 | " for %s after level change\n", | |
3438 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3439 | } |
e93f68a1 N |
3440 | } |
3441 | ||
3442 | module_put(mddev->pers->owner); | |
245f46c2 N |
3443 | mddev->pers = pers; |
3444 | mddev->private = priv; | |
3445 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3446 | mddev->level = mddev->new_level; | |
3447 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3448 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3449 | mddev->delta_disks = 0; |
fee68723 | 3450 | mddev->degraded = 0; |
9af204cf TM |
3451 | if (mddev->pers->sync_request == NULL) { |
3452 | /* this is now an array without redundancy, so | |
3453 | * it must always be in_sync | |
3454 | */ | |
3455 | mddev->in_sync = 1; | |
3456 | del_timer_sync(&mddev->safemode_timer); | |
3457 | } | |
245f46c2 N |
3458 | pers->run(mddev); |
3459 | mddev_resume(mddev); | |
3460 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3461 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3462 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3463 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3464 | md_new_event(mddev); |
d9d166c2 N |
3465 | return rv; |
3466 | } | |
3467 | ||
3468 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3469 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3470 | |
d4dbd025 N |
3471 | |
3472 | static ssize_t | |
fd01b88c | 3473 | layout_show(struct mddev *mddev, char *page) |
d4dbd025 N |
3474 | { |
3475 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3476 | if (mddev->reshape_position != MaxSector && |
3477 | mddev->layout != mddev->new_layout) | |
3478 | return sprintf(page, "%d (%d)\n", | |
3479 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3480 | return sprintf(page, "%d\n", mddev->layout); |
3481 | } | |
3482 | ||
3483 | static ssize_t | |
fd01b88c | 3484 | layout_store(struct mddev *mddev, const char *buf, size_t len) |
d4dbd025 N |
3485 | { |
3486 | char *e; | |
3487 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3488 | |
3489 | if (!*buf || (*e && *e != '\n')) | |
3490 | return -EINVAL; | |
3491 | ||
b3546035 N |
3492 | if (mddev->pers) { |
3493 | int err; | |
50ac168a | 3494 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3495 | return -EBUSY; |
597a711b | 3496 | mddev->new_layout = n; |
50ac168a | 3497 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3498 | if (err) { |
3499 | mddev->new_layout = mddev->layout; | |
b3546035 | 3500 | return err; |
597a711b | 3501 | } |
b3546035 | 3502 | } else { |
08a02ecd | 3503 | mddev->new_layout = n; |
b3546035 N |
3504 | if (mddev->reshape_position == MaxSector) |
3505 | mddev->layout = n; | |
3506 | } | |
d4dbd025 N |
3507 | return len; |
3508 | } | |
3509 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3510 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3511 | |
3512 | ||
eae1701f | 3513 | static ssize_t |
fd01b88c | 3514 | raid_disks_show(struct mddev *mddev, char *page) |
eae1701f | 3515 | { |
bb636547 N |
3516 | if (mddev->raid_disks == 0) |
3517 | return 0; | |
08a02ecd N |
3518 | if (mddev->reshape_position != MaxSector && |
3519 | mddev->delta_disks != 0) | |
3520 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3521 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3522 | return sprintf(page, "%d\n", mddev->raid_disks); |
3523 | } | |
3524 | ||
fd01b88c | 3525 | static int update_raid_disks(struct mddev *mddev, int raid_disks); |
da943b99 N |
3526 | |
3527 | static ssize_t | |
fd01b88c | 3528 | raid_disks_store(struct mddev *mddev, const char *buf, size_t len) |
da943b99 | 3529 | { |
da943b99 N |
3530 | char *e; |
3531 | int rv = 0; | |
3532 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3533 | ||
3534 | if (!*buf || (*e && *e != '\n')) | |
3535 | return -EINVAL; | |
3536 | ||
3537 | if (mddev->pers) | |
3538 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3539 | else if (mddev->reshape_position != MaxSector) { |
3540 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3541 | mddev->delta_disks = n - olddisks; | |
3542 | mddev->raid_disks = n; | |
3543 | } else | |
da943b99 N |
3544 | mddev->raid_disks = n; |
3545 | return rv ? rv : len; | |
3546 | } | |
3547 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3548 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3549 | |
3b34380a | 3550 | static ssize_t |
fd01b88c | 3551 | chunk_size_show(struct mddev *mddev, char *page) |
3b34380a | 3552 | { |
08a02ecd | 3553 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3554 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3555 | return sprintf(page, "%d (%d)\n", | |
3556 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3557 | mddev->chunk_sectors << 9); |
3558 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3559 | } |
3560 | ||
3561 | static ssize_t | |
fd01b88c | 3562 | chunk_size_store(struct mddev *mddev, const char *buf, size_t len) |
3b34380a | 3563 | { |
3b34380a N |
3564 | char *e; |
3565 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3566 | ||
3b34380a N |
3567 | if (!*buf || (*e && *e != '\n')) |
3568 | return -EINVAL; | |
3569 | ||
b3546035 N |
3570 | if (mddev->pers) { |
3571 | int err; | |
50ac168a | 3572 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3573 | return -EBUSY; |
597a711b | 3574 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3575 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3576 | if (err) { |
3577 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3578 | return err; |
597a711b | 3579 | } |
b3546035 | 3580 | } else { |
664e7c41 | 3581 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3582 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3583 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3584 | } |
3b34380a N |
3585 | return len; |
3586 | } | |
3587 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3588 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3589 | |
a94213b1 | 3590 | static ssize_t |
fd01b88c | 3591 | resync_start_show(struct mddev *mddev, char *page) |
a94213b1 | 3592 | { |
d1a7c503 N |
3593 | if (mddev->recovery_cp == MaxSector) |
3594 | return sprintf(page, "none\n"); | |
a94213b1 N |
3595 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3596 | } | |
3597 | ||
3598 | static ssize_t | |
fd01b88c | 3599 | resync_start_store(struct mddev *mddev, const char *buf, size_t len) |
a94213b1 | 3600 | { |
a94213b1 N |
3601 | char *e; |
3602 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3603 | ||
b098636c | 3604 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3605 | return -EBUSY; |
06e3c817 DW |
3606 | if (cmd_match(buf, "none")) |
3607 | n = MaxSector; | |
3608 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3609 | return -EINVAL; |
3610 | ||
3611 | mddev->recovery_cp = n; | |
3612 | return len; | |
3613 | } | |
3614 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3615 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3616 | |
9e653b63 N |
3617 | /* |
3618 | * The array state can be: | |
3619 | * | |
3620 | * clear | |
3621 | * No devices, no size, no level | |
3622 | * Equivalent to STOP_ARRAY ioctl | |
3623 | * inactive | |
3624 | * May have some settings, but array is not active | |
3625 | * all IO results in error | |
3626 | * When written, doesn't tear down array, but just stops it | |
3627 | * suspended (not supported yet) | |
3628 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3629 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3630 | * readonly |
3631 | * no resync can happen. no superblocks get written. | |
3632 | * write requests fail | |
3633 | * read-auto | |
3634 | * like readonly, but behaves like 'clean' on a write request. | |
3635 | * | |
3636 | * clean - no pending writes, but otherwise active. | |
3637 | * When written to inactive array, starts without resync | |
3638 | * If a write request arrives then | |
3639 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3640 | * if not known, block and switch to write-pending | |
3641 | * If written to an active array that has pending writes, then fails. | |
3642 | * active | |
3643 | * fully active: IO and resync can be happening. | |
3644 | * When written to inactive array, starts with resync | |
3645 | * | |
3646 | * write-pending | |
3647 | * clean, but writes are blocked waiting for 'active' to be written. | |
3648 | * | |
3649 | * active-idle | |
3650 | * like active, but no writes have been seen for a while (100msec). | |
3651 | * | |
3652 | */ | |
3653 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3654 | write_pending, active_idle, bad_word}; | |
05381954 | 3655 | static char *array_states[] = { |
9e653b63 N |
3656 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3657 | "write-pending", "active-idle", NULL }; | |
3658 | ||
3659 | static int match_word(const char *word, char **list) | |
3660 | { | |
3661 | int n; | |
3662 | for (n=0; list[n]; n++) | |
3663 | if (cmd_match(word, list[n])) | |
3664 | break; | |
3665 | return n; | |
3666 | } | |
3667 | ||
3668 | static ssize_t | |
fd01b88c | 3669 | array_state_show(struct mddev *mddev, char *page) |
9e653b63 N |
3670 | { |
3671 | enum array_state st = inactive; | |
3672 | ||
3673 | if (mddev->pers) | |
3674 | switch(mddev->ro) { | |
3675 | case 1: | |
3676 | st = readonly; | |
3677 | break; | |
3678 | case 2: | |
3679 | st = read_auto; | |
3680 | break; | |
3681 | case 0: | |
3682 | if (mddev->in_sync) | |
3683 | st = clean; | |
070dc6dd | 3684 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3685 | st = write_pending; |
9e653b63 N |
3686 | else if (mddev->safemode) |
3687 | st = active_idle; | |
3688 | else | |
3689 | st = active; | |
3690 | } | |
3691 | else { | |
3692 | if (list_empty(&mddev->disks) && | |
3693 | mddev->raid_disks == 0 && | |
58c0fed4 | 3694 | mddev->dev_sectors == 0) |
9e653b63 N |
3695 | st = clear; |
3696 | else | |
3697 | st = inactive; | |
3698 | } | |
3699 | return sprintf(page, "%s\n", array_states[st]); | |
3700 | } | |
3701 | ||
fd01b88c N |
3702 | static int do_md_stop(struct mddev * mddev, int ro, int is_open); |
3703 | static int md_set_readonly(struct mddev * mddev, int is_open); | |
3704 | static int do_md_run(struct mddev * mddev); | |
3705 | static int restart_array(struct mddev *mddev); | |
9e653b63 N |
3706 | |
3707 | static ssize_t | |
fd01b88c | 3708 | array_state_store(struct mddev *mddev, const char *buf, size_t len) |
9e653b63 N |
3709 | { |
3710 | int err = -EINVAL; | |
3711 | enum array_state st = match_word(buf, array_states); | |
3712 | switch(st) { | |
3713 | case bad_word: | |
3714 | break; | |
3715 | case clear: | |
3716 | /* stopping an active array */ | |
f2ea68cf | 3717 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3718 | return -EBUSY; |
df5b20cf | 3719 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3720 | break; |
3721 | case inactive: | |
3722 | /* stopping an active array */ | |
3723 | if (mddev->pers) { | |
f2ea68cf | 3724 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3725 | return -EBUSY; |
df5b20cf | 3726 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3727 | } else |
3728 | err = 0; /* already inactive */ | |
9e653b63 N |
3729 | break; |
3730 | case suspended: | |
3731 | break; /* not supported yet */ | |
3732 | case readonly: | |
3733 | if (mddev->pers) | |
a4bd82d0 | 3734 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3735 | else { |
3736 | mddev->ro = 1; | |
648b629e | 3737 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3738 | err = do_md_run(mddev); |
3739 | } | |
3740 | break; | |
3741 | case read_auto: | |
9e653b63 | 3742 | if (mddev->pers) { |
80268ee9 | 3743 | if (mddev->ro == 0) |
a4bd82d0 | 3744 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3745 | else if (mddev->ro == 1) |
648b629e N |
3746 | err = restart_array(mddev); |
3747 | if (err == 0) { | |
3748 | mddev->ro = 2; | |
3749 | set_disk_ro(mddev->gendisk, 0); | |
3750 | } | |
9e653b63 N |
3751 | } else { |
3752 | mddev->ro = 2; | |
3753 | err = do_md_run(mddev); | |
3754 | } | |
3755 | break; | |
3756 | case clean: | |
3757 | if (mddev->pers) { | |
3758 | restart_array(mddev); | |
3759 | spin_lock_irq(&mddev->write_lock); | |
3760 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3761 | if (mddev->in_sync == 0) { |
3762 | mddev->in_sync = 1; | |
31a59e34 N |
3763 | if (mddev->safemode == 1) |
3764 | mddev->safemode = 0; | |
070dc6dd | 3765 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3766 | } |
3767 | err = 0; | |
3768 | } else | |
3769 | err = -EBUSY; | |
9e653b63 | 3770 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3771 | } else |
3772 | err = -EINVAL; | |
9e653b63 N |
3773 | break; |
3774 | case active: | |
3775 | if (mddev->pers) { | |
3776 | restart_array(mddev); | |
070dc6dd | 3777 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3778 | wake_up(&mddev->sb_wait); |
3779 | err = 0; | |
3780 | } else { | |
3781 | mddev->ro = 0; | |
648b629e | 3782 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3783 | err = do_md_run(mddev); |
3784 | } | |
3785 | break; | |
3786 | case write_pending: | |
3787 | case active_idle: | |
3788 | /* these cannot be set */ | |
3789 | break; | |
3790 | } | |
3791 | if (err) | |
3792 | return err; | |
0fd62b86 | 3793 | else { |
00bcb4ac | 3794 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3795 | return len; |
0fd62b86 | 3796 | } |
9e653b63 | 3797 | } |
80ca3a44 N |
3798 | static struct md_sysfs_entry md_array_state = |
3799 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3800 | |
1e50915f | 3801 | static ssize_t |
fd01b88c | 3802 | max_corrected_read_errors_show(struct mddev *mddev, char *page) { |
1e50915f RB |
3803 | return sprintf(page, "%d\n", |
3804 | atomic_read(&mddev->max_corr_read_errors)); | |
3805 | } | |
3806 | ||
3807 | static ssize_t | |
fd01b88c | 3808 | max_corrected_read_errors_store(struct mddev *mddev, const char *buf, size_t len) |
1e50915f RB |
3809 | { |
3810 | char *e; | |
3811 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3812 | ||
3813 | if (*buf && (*e == 0 || *e == '\n')) { | |
3814 | atomic_set(&mddev->max_corr_read_errors, n); | |
3815 | return len; | |
3816 | } | |
3817 | return -EINVAL; | |
3818 | } | |
3819 | ||
3820 | static struct md_sysfs_entry max_corr_read_errors = | |
3821 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3822 | max_corrected_read_errors_store); | |
3823 | ||
6d7ff738 | 3824 | static ssize_t |
fd01b88c | 3825 | null_show(struct mddev *mddev, char *page) |
6d7ff738 N |
3826 | { |
3827 | return -EINVAL; | |
3828 | } | |
3829 | ||
3830 | static ssize_t | |
fd01b88c | 3831 | new_dev_store(struct mddev *mddev, const char *buf, size_t len) |
6d7ff738 N |
3832 | { |
3833 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3834 | /* The new device is added to the array. | |
3835 | * If the array has a persistent superblock, we read the | |
3836 | * superblock to initialise info and check validity. | |
3837 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3838 | * which mainly checks size. | |
3839 | */ | |
3840 | char *e; | |
3841 | int major = simple_strtoul(buf, &e, 10); | |
3842 | int minor; | |
3843 | dev_t dev; | |
3cb03002 | 3844 | struct md_rdev *rdev; |
6d7ff738 N |
3845 | int err; |
3846 | ||
3847 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3848 | return -EINVAL; | |
3849 | minor = simple_strtoul(e+1, &e, 10); | |
3850 | if (*e && *e != '\n') | |
3851 | return -EINVAL; | |
3852 | dev = MKDEV(major, minor); | |
3853 | if (major != MAJOR(dev) || | |
3854 | minor != MINOR(dev)) | |
3855 | return -EOVERFLOW; | |
3856 | ||
3857 | ||
3858 | if (mddev->persistent) { | |
3859 | rdev = md_import_device(dev, mddev->major_version, | |
3860 | mddev->minor_version); | |
3861 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3cb03002 N |
3862 | struct md_rdev *rdev0 |
3863 | = list_entry(mddev->disks.next, | |
3864 | struct md_rdev, same_set); | |
6d7ff738 N |
3865 | err = super_types[mddev->major_version] |
3866 | .load_super(rdev, rdev0, mddev->minor_version); | |
3867 | if (err < 0) | |
3868 | goto out; | |
3869 | } | |
c5d79adb N |
3870 | } else if (mddev->external) |
3871 | rdev = md_import_device(dev, -2, -1); | |
3872 | else | |
6d7ff738 N |
3873 | rdev = md_import_device(dev, -1, -1); |
3874 | ||
3875 | if (IS_ERR(rdev)) | |
3876 | return PTR_ERR(rdev); | |
3877 | err = bind_rdev_to_array(rdev, mddev); | |
3878 | out: | |
3879 | if (err) | |
3880 | export_rdev(rdev); | |
3881 | return err ? err : len; | |
3882 | } | |
3883 | ||
3884 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3885 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3886 | |
9b1d1dac | 3887 | static ssize_t |
fd01b88c | 3888 | bitmap_store(struct mddev *mddev, const char *buf, size_t len) |
9b1d1dac PC |
3889 | { |
3890 | char *end; | |
3891 | unsigned long chunk, end_chunk; | |
3892 | ||
3893 | if (!mddev->bitmap) | |
3894 | goto out; | |
3895 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3896 | while (*buf) { | |
3897 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3898 | if (buf == end) break; | |
3899 | if (*end == '-') { /* range */ | |
3900 | buf = end + 1; | |
3901 | end_chunk = simple_strtoul(buf, &end, 0); | |
3902 | if (buf == end) break; | |
3903 | } | |
3904 | if (*end && !isspace(*end)) break; | |
3905 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3906 | buf = skip_spaces(end); |
9b1d1dac PC |
3907 | } |
3908 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3909 | out: | |
3910 | return len; | |
3911 | } | |
3912 | ||
3913 | static struct md_sysfs_entry md_bitmap = | |
3914 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3915 | ||
a35b0d69 | 3916 | static ssize_t |
fd01b88c | 3917 | size_show(struct mddev *mddev, char *page) |
a35b0d69 | 3918 | { |
58c0fed4 AN |
3919 | return sprintf(page, "%llu\n", |
3920 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3921 | } |
3922 | ||
fd01b88c | 3923 | static int update_size(struct mddev *mddev, sector_t num_sectors); |
a35b0d69 N |
3924 | |
3925 | static ssize_t | |
fd01b88c | 3926 | size_store(struct mddev *mddev, const char *buf, size_t len) |
a35b0d69 N |
3927 | { |
3928 | /* If array is inactive, we can reduce the component size, but | |
3929 | * not increase it (except from 0). | |
3930 | * If array is active, we can try an on-line resize | |
3931 | */ | |
b522adcd DW |
3932 | sector_t sectors; |
3933 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3934 | |
58c0fed4 AN |
3935 | if (err < 0) |
3936 | return err; | |
a35b0d69 | 3937 | if (mddev->pers) { |
58c0fed4 | 3938 | err = update_size(mddev, sectors); |
850b2b42 | 3939 | md_update_sb(mddev, 1); |
a35b0d69 | 3940 | } else { |
58c0fed4 AN |
3941 | if (mddev->dev_sectors == 0 || |
3942 | mddev->dev_sectors > sectors) | |
3943 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3944 | else |
3945 | err = -ENOSPC; | |
3946 | } | |
3947 | return err ? err : len; | |
3948 | } | |
3949 | ||
3950 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3951 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3952 | |
8bb93aac N |
3953 | |
3954 | /* Metdata version. | |
e691063a N |
3955 | * This is one of |
3956 | * 'none' for arrays with no metadata (good luck...) | |
3957 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3958 | * or N.M for internally known formats |
3959 | */ | |
3960 | static ssize_t | |
fd01b88c | 3961 | metadata_show(struct mddev *mddev, char *page) |
8bb93aac N |
3962 | { |
3963 | if (mddev->persistent) | |
3964 | return sprintf(page, "%d.%d\n", | |
3965 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3966 | else if (mddev->external) |
3967 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3968 | else |
3969 | return sprintf(page, "none\n"); | |
3970 | } | |
3971 | ||
3972 | static ssize_t | |
fd01b88c | 3973 | metadata_store(struct mddev *mddev, const char *buf, size_t len) |
8bb93aac N |
3974 | { |
3975 | int major, minor; | |
3976 | char *e; | |
ea43ddd8 N |
3977 | /* Changing the details of 'external' metadata is |
3978 | * always permitted. Otherwise there must be | |
3979 | * no devices attached to the array. | |
3980 | */ | |
3981 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3982 | ; | |
3983 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3984 | return -EBUSY; |
3985 | ||
3986 | if (cmd_match(buf, "none")) { | |
3987 | mddev->persistent = 0; | |
e691063a N |
3988 | mddev->external = 0; |
3989 | mddev->major_version = 0; | |
3990 | mddev->minor_version = 90; | |
3991 | return len; | |
3992 | } | |
3993 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3994 | size_t namelen = len-9; |
e691063a N |
3995 | if (namelen >= sizeof(mddev->metadata_type)) |
3996 | namelen = sizeof(mddev->metadata_type)-1; | |
3997 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3998 | mddev->metadata_type[namelen] = 0; | |
3999 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
4000 | mddev->metadata_type[--namelen] = 0; | |
4001 | mddev->persistent = 0; | |
4002 | mddev->external = 1; | |
8bb93aac N |
4003 | mddev->major_version = 0; |
4004 | mddev->minor_version = 90; | |
4005 | return len; | |
4006 | } | |
4007 | major = simple_strtoul(buf, &e, 10); | |
4008 | if (e==buf || *e != '.') | |
4009 | return -EINVAL; | |
4010 | buf = e+1; | |
4011 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 4012 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 4013 | return -EINVAL; |
50511da3 | 4014 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
4015 | return -ENOENT; |
4016 | mddev->major_version = major; | |
4017 | mddev->minor_version = minor; | |
4018 | mddev->persistent = 1; | |
e691063a | 4019 | mddev->external = 0; |
8bb93aac N |
4020 | return len; |
4021 | } | |
4022 | ||
4023 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 4024 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 4025 | |
24dd469d | 4026 | static ssize_t |
fd01b88c | 4027 | action_show(struct mddev *mddev, char *page) |
24dd469d | 4028 | { |
7eec314d | 4029 | char *type = "idle"; |
b6a9ce68 N |
4030 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
4031 | type = "frozen"; | |
4032 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 4033 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
4034 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
4035 | type = "reshape"; | |
4036 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
4037 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
4038 | type = "resync"; | |
4039 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
4040 | type = "check"; | |
4041 | else | |
4042 | type = "repair"; | |
72a23c21 | 4043 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
4044 | type = "recover"; |
4045 | } | |
4046 | return sprintf(page, "%s\n", type); | |
4047 | } | |
4048 | ||
fd01b88c | 4049 | static void reap_sync_thread(struct mddev *mddev); |
7ebc0be7 | 4050 | |
24dd469d | 4051 | static ssize_t |
fd01b88c | 4052 | action_store(struct mddev *mddev, const char *page, size_t len) |
24dd469d | 4053 | { |
7eec314d N |
4054 | if (!mddev->pers || !mddev->pers->sync_request) |
4055 | return -EINVAL; | |
4056 | ||
b6a9ce68 N |
4057 | if (cmd_match(page, "frozen")) |
4058 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4059 | else | |
4060 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4061 | ||
4062 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
4063 | if (mddev->sync_thread) { |
4064 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 4065 | reap_sync_thread(mddev); |
7eec314d | 4066 | } |
03c902e1 N |
4067 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4068 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4069 | return -EBUSY; |
72a23c21 NB |
4070 | else if (cmd_match(page, "resync")) |
4071 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4072 | else if (cmd_match(page, "recover")) { | |
4073 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4074 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4075 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4076 | int err; |
4077 | if (mddev->pers->start_reshape == NULL) | |
4078 | return -EINVAL; | |
4079 | err = mddev->pers->start_reshape(mddev); | |
4080 | if (err) | |
4081 | return err; | |
a99ac971 | 4082 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4083 | } else { |
bce74dac | 4084 | if (cmd_match(page, "check")) |
7eec314d | 4085 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4086 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4087 | return -EINVAL; |
4088 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4089 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4090 | } |
03c902e1 | 4091 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4092 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4093 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4094 | return len; |
4095 | } | |
4096 | ||
9d88883e | 4097 | static ssize_t |
fd01b88c | 4098 | mismatch_cnt_show(struct mddev *mddev, char *page) |
9d88883e N |
4099 | { |
4100 | return sprintf(page, "%llu\n", | |
4101 | (unsigned long long) mddev->resync_mismatches); | |
4102 | } | |
4103 | ||
80ca3a44 N |
4104 | static struct md_sysfs_entry md_scan_mode = |
4105 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 4106 | |
96de1e66 | 4107 | |
80ca3a44 | 4108 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4109 | |
88202a0c | 4110 | static ssize_t |
fd01b88c | 4111 | sync_min_show(struct mddev *mddev, char *page) |
88202a0c N |
4112 | { |
4113 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4114 | mddev->sync_speed_min ? "local": "system"); | |
4115 | } | |
4116 | ||
4117 | static ssize_t | |
fd01b88c | 4118 | sync_min_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4119 | { |
4120 | int min; | |
4121 | char *e; | |
4122 | if (strncmp(buf, "system", 6)==0) { | |
4123 | mddev->sync_speed_min = 0; | |
4124 | return len; | |
4125 | } | |
4126 | min = simple_strtoul(buf, &e, 10); | |
4127 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4128 | return -EINVAL; | |
4129 | mddev->sync_speed_min = min; | |
4130 | return len; | |
4131 | } | |
4132 | ||
4133 | static struct md_sysfs_entry md_sync_min = | |
4134 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4135 | ||
4136 | static ssize_t | |
fd01b88c | 4137 | sync_max_show(struct mddev *mddev, char *page) |
88202a0c N |
4138 | { |
4139 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4140 | mddev->sync_speed_max ? "local": "system"); | |
4141 | } | |
4142 | ||
4143 | static ssize_t | |
fd01b88c | 4144 | sync_max_store(struct mddev *mddev, const char *buf, size_t len) |
88202a0c N |
4145 | { |
4146 | int max; | |
4147 | char *e; | |
4148 | if (strncmp(buf, "system", 6)==0) { | |
4149 | mddev->sync_speed_max = 0; | |
4150 | return len; | |
4151 | } | |
4152 | max = simple_strtoul(buf, &e, 10); | |
4153 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4154 | return -EINVAL; | |
4155 | mddev->sync_speed_max = max; | |
4156 | return len; | |
4157 | } | |
4158 | ||
4159 | static struct md_sysfs_entry md_sync_max = | |
4160 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4161 | ||
d7f3d291 | 4162 | static ssize_t |
fd01b88c | 4163 | degraded_show(struct mddev *mddev, char *page) |
d7f3d291 IP |
4164 | { |
4165 | return sprintf(page, "%d\n", mddev->degraded); | |
4166 | } | |
4167 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4168 | |
90b08710 | 4169 | static ssize_t |
fd01b88c | 4170 | sync_force_parallel_show(struct mddev *mddev, char *page) |
90b08710 BS |
4171 | { |
4172 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4173 | } | |
4174 | ||
4175 | static ssize_t | |
fd01b88c | 4176 | sync_force_parallel_store(struct mddev *mddev, const char *buf, size_t len) |
90b08710 BS |
4177 | { |
4178 | long n; | |
4179 | ||
4180 | if (strict_strtol(buf, 10, &n)) | |
4181 | return -EINVAL; | |
4182 | ||
4183 | if (n != 0 && n != 1) | |
4184 | return -EINVAL; | |
4185 | ||
4186 | mddev->parallel_resync = n; | |
4187 | ||
4188 | if (mddev->sync_thread) | |
4189 | wake_up(&resync_wait); | |
4190 | ||
4191 | return len; | |
4192 | } | |
4193 | ||
4194 | /* force parallel resync, even with shared block devices */ | |
4195 | static struct md_sysfs_entry md_sync_force_parallel = | |
4196 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4197 | sync_force_parallel_show, sync_force_parallel_store); | |
4198 | ||
88202a0c | 4199 | static ssize_t |
fd01b88c | 4200 | sync_speed_show(struct mddev *mddev, char *page) |
88202a0c N |
4201 | { |
4202 | unsigned long resync, dt, db; | |
d1a7c503 N |
4203 | if (mddev->curr_resync == 0) |
4204 | return sprintf(page, "none\n"); | |
9687a60c AN |
4205 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4206 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4207 | if (!dt) dt++; |
9687a60c AN |
4208 | db = resync - mddev->resync_mark_cnt; |
4209 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4210 | } |
4211 | ||
80ca3a44 | 4212 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4213 | |
4214 | static ssize_t | |
fd01b88c | 4215 | sync_completed_show(struct mddev *mddev, char *page) |
88202a0c | 4216 | { |
13ae864b | 4217 | unsigned long long max_sectors, resync; |
88202a0c | 4218 | |
acb180b0 N |
4219 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4220 | return sprintf(page, "none\n"); | |
4221 | ||
88202a0c | 4222 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 4223 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4224 | else |
58c0fed4 | 4225 | max_sectors = mddev->dev_sectors; |
88202a0c | 4226 | |
acb180b0 | 4227 | resync = mddev->curr_resync_completed; |
13ae864b | 4228 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4229 | } |
4230 | ||
80ca3a44 | 4231 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4232 | |
5e96ee65 | 4233 | static ssize_t |
fd01b88c | 4234 | min_sync_show(struct mddev *mddev, char *page) |
5e96ee65 NB |
4235 | { |
4236 | return sprintf(page, "%llu\n", | |
4237 | (unsigned long long)mddev->resync_min); | |
4238 | } | |
4239 | static ssize_t | |
fd01b88c | 4240 | min_sync_store(struct mddev *mddev, const char *buf, size_t len) |
5e96ee65 NB |
4241 | { |
4242 | unsigned long long min; | |
4243 | if (strict_strtoull(buf, 10, &min)) | |
4244 | return -EINVAL; | |
4245 | if (min > mddev->resync_max) | |
4246 | return -EINVAL; | |
4247 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4248 | return -EBUSY; | |
4249 | ||
4250 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4251 | if (mddev->chunk_sectors) { |
2ac06c33 | 4252 | sector_t temp = min; |
9d8f0363 | 4253 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4254 | return -EINVAL; |
4255 | } | |
4256 | mddev->resync_min = min; | |
4257 | ||
4258 | return len; | |
4259 | } | |
4260 | ||
4261 | static struct md_sysfs_entry md_min_sync = | |
4262 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4263 | ||
c6207277 | 4264 | static ssize_t |
fd01b88c | 4265 | max_sync_show(struct mddev *mddev, char *page) |
c6207277 N |
4266 | { |
4267 | if (mddev->resync_max == MaxSector) | |
4268 | return sprintf(page, "max\n"); | |
4269 | else | |
4270 | return sprintf(page, "%llu\n", | |
4271 | (unsigned long long)mddev->resync_max); | |
4272 | } | |
4273 | static ssize_t | |
fd01b88c | 4274 | max_sync_store(struct mddev *mddev, const char *buf, size_t len) |
c6207277 N |
4275 | { |
4276 | if (strncmp(buf, "max", 3) == 0) | |
4277 | mddev->resync_max = MaxSector; | |
4278 | else { | |
5e96ee65 NB |
4279 | unsigned long long max; |
4280 | if (strict_strtoull(buf, 10, &max)) | |
4281 | return -EINVAL; | |
4282 | if (max < mddev->resync_min) | |
c6207277 N |
4283 | return -EINVAL; |
4284 | if (max < mddev->resync_max && | |
4d484a4a | 4285 | mddev->ro == 0 && |
c6207277 N |
4286 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4287 | return -EBUSY; | |
4288 | ||
4289 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4290 | if (mddev->chunk_sectors) { |
2ac06c33 | 4291 | sector_t temp = max; |
9d8f0363 | 4292 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4293 | return -EINVAL; |
4294 | } | |
4295 | mddev->resync_max = max; | |
4296 | } | |
4297 | wake_up(&mddev->recovery_wait); | |
4298 | return len; | |
4299 | } | |
4300 | ||
4301 | static struct md_sysfs_entry md_max_sync = | |
4302 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4303 | ||
e464eafd | 4304 | static ssize_t |
fd01b88c | 4305 | suspend_lo_show(struct mddev *mddev, char *page) |
e464eafd N |
4306 | { |
4307 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4308 | } | |
4309 | ||
4310 | static ssize_t | |
fd01b88c | 4311 | suspend_lo_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4312 | { |
4313 | char *e; | |
4314 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4315 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4316 | |
b8d966ef N |
4317 | if (mddev->pers == NULL || |
4318 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4319 | return -EINVAL; |
4320 | if (buf == e || (*e && *e != '\n')) | |
4321 | return -EINVAL; | |
23ddff37 N |
4322 | |
4323 | mddev->suspend_lo = new; | |
4324 | if (new >= old) | |
4325 | /* Shrinking suspended region */ | |
e464eafd | 4326 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4327 | else { |
4328 | /* Expanding suspended region - need to wait */ | |
4329 | mddev->pers->quiesce(mddev, 1); | |
4330 | mddev->pers->quiesce(mddev, 0); | |
4331 | } | |
4332 | return len; | |
e464eafd N |
4333 | } |
4334 | static struct md_sysfs_entry md_suspend_lo = | |
4335 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4336 | ||
4337 | ||
4338 | static ssize_t | |
fd01b88c | 4339 | suspend_hi_show(struct mddev *mddev, char *page) |
e464eafd N |
4340 | { |
4341 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4342 | } | |
4343 | ||
4344 | static ssize_t | |
fd01b88c | 4345 | suspend_hi_store(struct mddev *mddev, const char *buf, size_t len) |
e464eafd N |
4346 | { |
4347 | char *e; | |
4348 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4349 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4350 | |
b8d966ef N |
4351 | if (mddev->pers == NULL || |
4352 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4353 | return -EINVAL; |
4354 | if (buf == e || (*e && *e != '\n')) | |
4355 | return -EINVAL; | |
23ddff37 N |
4356 | |
4357 | mddev->suspend_hi = new; | |
4358 | if (new <= old) | |
4359 | /* Shrinking suspended region */ | |
4360 | mddev->pers->quiesce(mddev, 2); | |
4361 | else { | |
4362 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4363 | mddev->pers->quiesce(mddev, 1); |
4364 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4365 | } |
4366 | return len; | |
e464eafd N |
4367 | } |
4368 | static struct md_sysfs_entry md_suspend_hi = | |
4369 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4370 | ||
08a02ecd | 4371 | static ssize_t |
fd01b88c | 4372 | reshape_position_show(struct mddev *mddev, char *page) |
08a02ecd N |
4373 | { |
4374 | if (mddev->reshape_position != MaxSector) | |
4375 | return sprintf(page, "%llu\n", | |
4376 | (unsigned long long)mddev->reshape_position); | |
4377 | strcpy(page, "none\n"); | |
4378 | return 5; | |
4379 | } | |
4380 | ||
4381 | static ssize_t | |
fd01b88c | 4382 | reshape_position_store(struct mddev *mddev, const char *buf, size_t len) |
08a02ecd N |
4383 | { |
4384 | char *e; | |
4385 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4386 | if (mddev->pers) | |
4387 | return -EBUSY; | |
4388 | if (buf == e || (*e && *e != '\n')) | |
4389 | return -EINVAL; | |
4390 | mddev->reshape_position = new; | |
4391 | mddev->delta_disks = 0; | |
4392 | mddev->new_level = mddev->level; | |
4393 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4394 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4395 | return len; |
4396 | } | |
4397 | ||
4398 | static struct md_sysfs_entry md_reshape_position = | |
4399 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4400 | reshape_position_store); | |
4401 | ||
b522adcd | 4402 | static ssize_t |
fd01b88c | 4403 | array_size_show(struct mddev *mddev, char *page) |
b522adcd DW |
4404 | { |
4405 | if (mddev->external_size) | |
4406 | return sprintf(page, "%llu\n", | |
4407 | (unsigned long long)mddev->array_sectors/2); | |
4408 | else | |
4409 | return sprintf(page, "default\n"); | |
4410 | } | |
4411 | ||
4412 | static ssize_t | |
fd01b88c | 4413 | array_size_store(struct mddev *mddev, const char *buf, size_t len) |
b522adcd DW |
4414 | { |
4415 | sector_t sectors; | |
4416 | ||
4417 | if (strncmp(buf, "default", 7) == 0) { | |
4418 | if (mddev->pers) | |
4419 | sectors = mddev->pers->size(mddev, 0, 0); | |
4420 | else | |
4421 | sectors = mddev->array_sectors; | |
4422 | ||
4423 | mddev->external_size = 0; | |
4424 | } else { | |
4425 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4426 | return -EINVAL; | |
4427 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4428 | return -E2BIG; |
b522adcd DW |
4429 | |
4430 | mddev->external_size = 1; | |
4431 | } | |
4432 | ||
4433 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4434 | if (mddev->pers) { |
4435 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4436 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4437 | } |
b522adcd DW |
4438 | return len; |
4439 | } | |
4440 | ||
4441 | static struct md_sysfs_entry md_array_size = | |
4442 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4443 | array_size_store); | |
e464eafd | 4444 | |
eae1701f N |
4445 | static struct attribute *md_default_attrs[] = { |
4446 | &md_level.attr, | |
d4dbd025 | 4447 | &md_layout.attr, |
eae1701f | 4448 | &md_raid_disks.attr, |
3b34380a | 4449 | &md_chunk_size.attr, |
a35b0d69 | 4450 | &md_size.attr, |
a94213b1 | 4451 | &md_resync_start.attr, |
8bb93aac | 4452 | &md_metadata.attr, |
6d7ff738 | 4453 | &md_new_device.attr, |
16f17b39 | 4454 | &md_safe_delay.attr, |
9e653b63 | 4455 | &md_array_state.attr, |
08a02ecd | 4456 | &md_reshape_position.attr, |
b522adcd | 4457 | &md_array_size.attr, |
1e50915f | 4458 | &max_corr_read_errors.attr, |
411036fa N |
4459 | NULL, |
4460 | }; | |
4461 | ||
4462 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4463 | &md_scan_mode.attr, |
9d88883e | 4464 | &md_mismatches.attr, |
88202a0c N |
4465 | &md_sync_min.attr, |
4466 | &md_sync_max.attr, | |
4467 | &md_sync_speed.attr, | |
90b08710 | 4468 | &md_sync_force_parallel.attr, |
88202a0c | 4469 | &md_sync_completed.attr, |
5e96ee65 | 4470 | &md_min_sync.attr, |
c6207277 | 4471 | &md_max_sync.attr, |
e464eafd N |
4472 | &md_suspend_lo.attr, |
4473 | &md_suspend_hi.attr, | |
9b1d1dac | 4474 | &md_bitmap.attr, |
d7f3d291 | 4475 | &md_degraded.attr, |
eae1701f N |
4476 | NULL, |
4477 | }; | |
411036fa N |
4478 | static struct attribute_group md_redundancy_group = { |
4479 | .name = NULL, | |
4480 | .attrs = md_redundancy_attrs, | |
4481 | }; | |
4482 | ||
eae1701f N |
4483 | |
4484 | static ssize_t | |
4485 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4486 | { | |
4487 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4488 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4489 | ssize_t rv; |
eae1701f N |
4490 | |
4491 | if (!entry->show) | |
4492 | return -EIO; | |
5dc5cf7d IM |
4493 | rv = mddev_lock(mddev); |
4494 | if (!rv) { | |
4495 | rv = entry->show(mddev, page); | |
4496 | mddev_unlock(mddev); | |
4497 | } | |
96de1e66 | 4498 | return rv; |
eae1701f N |
4499 | } |
4500 | ||
4501 | static ssize_t | |
4502 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4503 | const char *page, size_t length) | |
4504 | { | |
4505 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
fd01b88c | 4506 | struct mddev *mddev = container_of(kobj, struct mddev, kobj); |
96de1e66 | 4507 | ssize_t rv; |
eae1701f N |
4508 | |
4509 | if (!entry->store) | |
4510 | return -EIO; | |
67463acb N |
4511 | if (!capable(CAP_SYS_ADMIN)) |
4512 | return -EACCES; | |
5dc5cf7d | 4513 | rv = mddev_lock(mddev); |
d3374825 N |
4514 | if (mddev->hold_active == UNTIL_IOCTL) |
4515 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4516 | if (!rv) { |
4517 | rv = entry->store(mddev, page, length); | |
4518 | mddev_unlock(mddev); | |
4519 | } | |
96de1e66 | 4520 | return rv; |
eae1701f N |
4521 | } |
4522 | ||
4523 | static void md_free(struct kobject *ko) | |
4524 | { | |
fd01b88c | 4525 | struct mddev *mddev = container_of(ko, struct mddev, kobj); |
a21d1504 N |
4526 | |
4527 | if (mddev->sysfs_state) | |
4528 | sysfs_put(mddev->sysfs_state); | |
4529 | ||
4530 | if (mddev->gendisk) { | |
4531 | del_gendisk(mddev->gendisk); | |
4532 | put_disk(mddev->gendisk); | |
4533 | } | |
4534 | if (mddev->queue) | |
4535 | blk_cleanup_queue(mddev->queue); | |
4536 | ||
eae1701f N |
4537 | kfree(mddev); |
4538 | } | |
4539 | ||
52cf25d0 | 4540 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4541 | .show = md_attr_show, |
4542 | .store = md_attr_store, | |
4543 | }; | |
4544 | static struct kobj_type md_ktype = { | |
4545 | .release = md_free, | |
4546 | .sysfs_ops = &md_sysfs_ops, | |
4547 | .default_attrs = md_default_attrs, | |
4548 | }; | |
4549 | ||
1da177e4 LT |
4550 | int mdp_major = 0; |
4551 | ||
5fd3a17e DW |
4552 | static void mddev_delayed_delete(struct work_struct *ws) |
4553 | { | |
fd01b88c | 4554 | struct mddev *mddev = container_of(ws, struct mddev, del_work); |
5fd3a17e | 4555 | |
43a70507 | 4556 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4557 | kobject_del(&mddev->kobj); |
4558 | kobject_put(&mddev->kobj); | |
4559 | } | |
4560 | ||
efeb53c0 | 4561 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4562 | { |
48c9c27b | 4563 | static DEFINE_MUTEX(disks_mutex); |
fd01b88c | 4564 | struct mddev *mddev = mddev_find(dev); |
1da177e4 | 4565 | struct gendisk *disk; |
efeb53c0 N |
4566 | int partitioned; |
4567 | int shift; | |
4568 | int unit; | |
3830c62f | 4569 | int error; |
1da177e4 LT |
4570 | |
4571 | if (!mddev) | |
efeb53c0 N |
4572 | return -ENODEV; |
4573 | ||
4574 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4575 | shift = partitioned ? MdpMinorShift : 0; | |
4576 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4577 | |
e804ac78 TH |
4578 | /* wait for any previous instance of this device to be |
4579 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4580 | */ |
e804ac78 | 4581 | flush_workqueue(md_misc_wq); |
d3374825 | 4582 | |
48c9c27b | 4583 | mutex_lock(&disks_mutex); |
0909dc44 N |
4584 | error = -EEXIST; |
4585 | if (mddev->gendisk) | |
4586 | goto abort; | |
efeb53c0 N |
4587 | |
4588 | if (name) { | |
4589 | /* Need to ensure that 'name' is not a duplicate. | |
4590 | */ | |
fd01b88c | 4591 | struct mddev *mddev2; |
efeb53c0 N |
4592 | spin_lock(&all_mddevs_lock); |
4593 | ||
4594 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4595 | if (mddev2->gendisk && | |
4596 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4597 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4598 | goto abort; |
efeb53c0 N |
4599 | } |
4600 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4601 | } |
8b765398 | 4602 | |
0909dc44 | 4603 | error = -ENOMEM; |
8b765398 | 4604 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4605 | if (!mddev->queue) |
4606 | goto abort; | |
409c57f3 N |
4607 | mddev->queue->queuedata = mddev; |
4608 | ||
409c57f3 | 4609 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4610 | |
1da177e4 LT |
4611 | disk = alloc_disk(1 << shift); |
4612 | if (!disk) { | |
8b765398 N |
4613 | blk_cleanup_queue(mddev->queue); |
4614 | mddev->queue = NULL; | |
0909dc44 | 4615 | goto abort; |
1da177e4 | 4616 | } |
efeb53c0 | 4617 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4618 | disk->first_minor = unit << shift; |
efeb53c0 N |
4619 | if (name) |
4620 | strcpy(disk->disk_name, name); | |
4621 | else if (partitioned) | |
1da177e4 | 4622 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4623 | else |
1da177e4 | 4624 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4625 | disk->fops = &md_fops; |
4626 | disk->private_data = mddev; | |
4627 | disk->queue = mddev->queue; | |
b0140891 | 4628 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4629 | /* Allow extended partitions. This makes the |
d3374825 | 4630 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4631 | * remove it now. |
4632 | */ | |
4633 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4634 | mddev->gendisk = disk; |
b0140891 N |
4635 | /* As soon as we call add_disk(), another thread could get |
4636 | * through to md_open, so make sure it doesn't get too far | |
4637 | */ | |
4638 | mutex_lock(&mddev->open_mutex); | |
4639 | add_disk(disk); | |
4640 | ||
ed9e1982 TH |
4641 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4642 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4643 | if (error) { |
4644 | /* This isn't possible, but as kobject_init_and_add is marked | |
4645 | * __must_check, we must do something with the result | |
4646 | */ | |
5e55e2f5 N |
4647 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4648 | disk->disk_name); | |
0909dc44 N |
4649 | error = 0; |
4650 | } | |
00bcb4ac N |
4651 | if (mddev->kobj.sd && |
4652 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4653 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4654 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4655 | abort: |
4656 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4657 | if (!error && mddev->kobj.sd) { |
3830c62f | 4658 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4659 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4660 | } |
d3374825 | 4661 | mddev_put(mddev); |
0909dc44 | 4662 | return error; |
efeb53c0 N |
4663 | } |
4664 | ||
4665 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4666 | { | |
4667 | md_alloc(dev, NULL); | |
1da177e4 LT |
4668 | return NULL; |
4669 | } | |
4670 | ||
efeb53c0 N |
4671 | static int add_named_array(const char *val, struct kernel_param *kp) |
4672 | { | |
4673 | /* val must be "md_*" where * is not all digits. | |
4674 | * We allocate an array with a large free minor number, and | |
4675 | * set the name to val. val must not already be an active name. | |
4676 | */ | |
4677 | int len = strlen(val); | |
4678 | char buf[DISK_NAME_LEN]; | |
4679 | ||
4680 | while (len && val[len-1] == '\n') | |
4681 | len--; | |
4682 | if (len >= DISK_NAME_LEN) | |
4683 | return -E2BIG; | |
4684 | strlcpy(buf, val, len+1); | |
4685 | if (strncmp(buf, "md_", 3) != 0) | |
4686 | return -EINVAL; | |
4687 | return md_alloc(0, buf); | |
4688 | } | |
4689 | ||
1da177e4 LT |
4690 | static void md_safemode_timeout(unsigned long data) |
4691 | { | |
fd01b88c | 4692 | struct mddev *mddev = (struct mddev *) data; |
1da177e4 | 4693 | |
0fd62b86 NB |
4694 | if (!atomic_read(&mddev->writes_pending)) { |
4695 | mddev->safemode = 1; | |
4696 | if (mddev->external) | |
00bcb4ac | 4697 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4698 | } |
1da177e4 LT |
4699 | md_wakeup_thread(mddev->thread); |
4700 | } | |
4701 | ||
6ff8d8ec | 4702 | static int start_dirty_degraded; |
1da177e4 | 4703 | |
fd01b88c | 4704 | int md_run(struct mddev *mddev) |
1da177e4 | 4705 | { |
2604b703 | 4706 | int err; |
3cb03002 | 4707 | struct md_rdev *rdev; |
84fc4b56 | 4708 | struct md_personality *pers; |
1da177e4 | 4709 | |
a757e64c N |
4710 | if (list_empty(&mddev->disks)) |
4711 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4712 | return -EINVAL; |
1da177e4 LT |
4713 | |
4714 | if (mddev->pers) | |
4715 | return -EBUSY; | |
bb4f1e9d N |
4716 | /* Cannot run until previous stop completes properly */ |
4717 | if (mddev->sysfs_active) | |
4718 | return -EBUSY; | |
b6eb127d | 4719 | |
1da177e4 LT |
4720 | /* |
4721 | * Analyze all RAID superblock(s) | |
4722 | */ | |
1ec4a939 N |
4723 | if (!mddev->raid_disks) { |
4724 | if (!mddev->persistent) | |
4725 | return -EINVAL; | |
a757e64c | 4726 | analyze_sbs(mddev); |
1ec4a939 | 4727 | } |
1da177e4 | 4728 | |
d9d166c2 N |
4729 | if (mddev->level != LEVEL_NONE) |
4730 | request_module("md-level-%d", mddev->level); | |
4731 | else if (mddev->clevel[0]) | |
4732 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4733 | |
4734 | /* | |
4735 | * Drop all container device buffers, from now on | |
4736 | * the only valid external interface is through the md | |
4737 | * device. | |
1da177e4 | 4738 | */ |
159ec1fc | 4739 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4740 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4741 | continue; |
4742 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4743 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4744 | |
4745 | /* perform some consistency tests on the device. | |
4746 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4747 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4748 | */ |
a6ff7e08 JB |
4749 | if (rdev->meta_bdev) { |
4750 | /* Nothing to check */; | |
4751 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4752 | if (mddev->dev_sectors && |
4753 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4754 | > rdev->sb_start) { |
f0d76d70 N |
4755 | printk("md: %s: data overlaps metadata\n", |
4756 | mdname(mddev)); | |
4757 | return -EINVAL; | |
4758 | } | |
4759 | } else { | |
0f420358 | 4760 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4761 | > rdev->data_offset) { |
4762 | printk("md: %s: metadata overlaps data\n", | |
4763 | mdname(mddev)); | |
4764 | return -EINVAL; | |
4765 | } | |
4766 | } | |
00bcb4ac | 4767 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4768 | } |
4769 | ||
a167f663 | 4770 | if (mddev->bio_set == NULL) |
a519b26d | 4771 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, |
fd01b88c | 4772 | sizeof(struct mddev *)); |
a167f663 | 4773 | |
1da177e4 | 4774 | spin_lock(&pers_lock); |
d9d166c2 | 4775 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4776 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4777 | spin_unlock(&pers_lock); |
d9d166c2 N |
4778 | if (mddev->level != LEVEL_NONE) |
4779 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4780 | mddev->level); | |
4781 | else | |
4782 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4783 | mddev->clevel); | |
1da177e4 LT |
4784 | return -EINVAL; |
4785 | } | |
2604b703 | 4786 | mddev->pers = pers; |
1da177e4 | 4787 | spin_unlock(&pers_lock); |
34817e8c N |
4788 | if (mddev->level != pers->level) { |
4789 | mddev->level = pers->level; | |
4790 | mddev->new_level = pers->level; | |
4791 | } | |
d9d166c2 | 4792 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4793 | |
f6705578 | 4794 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4795 | pers->start_reshape == NULL) { |
f6705578 N |
4796 | /* This personality cannot handle reshaping... */ |
4797 | mddev->pers = NULL; | |
4798 | module_put(pers->owner); | |
4799 | return -EINVAL; | |
4800 | } | |
4801 | ||
7dd5e7c3 N |
4802 | if (pers->sync_request) { |
4803 | /* Warn if this is a potentially silly | |
4804 | * configuration. | |
4805 | */ | |
4806 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 4807 | struct md_rdev *rdev2; |
7dd5e7c3 | 4808 | int warned = 0; |
159ec1fc CR |
4809 | |
4810 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4811 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4812 | if (rdev < rdev2 && |
4813 | rdev->bdev->bd_contains == | |
4814 | rdev2->bdev->bd_contains) { | |
4815 | printk(KERN_WARNING | |
4816 | "%s: WARNING: %s appears to be" | |
4817 | " on the same physical disk as" | |
4818 | " %s.\n", | |
4819 | mdname(mddev), | |
4820 | bdevname(rdev->bdev,b), | |
4821 | bdevname(rdev2->bdev,b2)); | |
4822 | warned = 1; | |
4823 | } | |
4824 | } | |
159ec1fc | 4825 | |
7dd5e7c3 N |
4826 | if (warned) |
4827 | printk(KERN_WARNING | |
4828 | "True protection against single-disk" | |
4829 | " failure might be compromised.\n"); | |
4830 | } | |
4831 | ||
657390d2 | 4832 | mddev->recovery = 0; |
58c0fed4 AN |
4833 | /* may be over-ridden by personality */ |
4834 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4835 | ||
6ff8d8ec | 4836 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4837 | |
0f9552b5 | 4838 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4839 | mddev->ro = 2; /* read-only, but switch on first write */ |
4840 | ||
b15c2e57 | 4841 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4842 | if (err) |
4843 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4844 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4845 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4846 | " but 'external_size' not in effect?\n", __func__); | |
4847 | printk(KERN_ERR | |
4848 | "md: invalid array_size %llu > default size %llu\n", | |
4849 | (unsigned long long)mddev->array_sectors / 2, | |
4850 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4851 | err = -EINVAL; | |
4852 | mddev->pers->stop(mddev); | |
4853 | } | |
4854 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4855 | err = bitmap_create(mddev); |
4856 | if (err) { | |
4857 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4858 | mdname(mddev), err); | |
4859 | mddev->pers->stop(mddev); | |
4860 | } | |
4861 | } | |
1da177e4 | 4862 | if (err) { |
1da177e4 LT |
4863 | module_put(mddev->pers->owner); |
4864 | mddev->pers = NULL; | |
32a7627c N |
4865 | bitmap_destroy(mddev); |
4866 | return err; | |
1da177e4 | 4867 | } |
5e55e2f5 | 4868 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4869 | if (mddev->kobj.sd && |
4870 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4871 | printk(KERN_WARNING |
4872 | "md: cannot register extra attributes for %s\n", | |
4873 | mdname(mddev)); | |
00bcb4ac | 4874 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4875 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4876 | mddev->ro = 0; |
4877 | ||
1da177e4 | 4878 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4879 | atomic_set(&mddev->max_corr_read_errors, |
4880 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4881 | mddev->safemode = 0; |
4882 | mddev->safemode_timer.function = md_safemode_timeout; | |
4883 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4884 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4885 | mddev->in_sync = 1; |
0ca69886 N |
4886 | smp_wmb(); |
4887 | mddev->ready = 1; | |
159ec1fc | 4888 | list_for_each_entry(rdev, &mddev->disks, same_set) |
36fad858 NK |
4889 | if (rdev->raid_disk >= 0) |
4890 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 4891 | /* failure here is OK */; |
1da177e4 LT |
4892 | |
4893 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4894 | ||
850b2b42 N |
4895 | if (mddev->flags) |
4896 | md_update_sb(mddev, 0); | |
1da177e4 | 4897 | |
d7603b7e | 4898 | md_new_event(mddev); |
00bcb4ac N |
4899 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4900 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4901 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4902 | return 0; |
4903 | } | |
390ee602 | 4904 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4905 | |
fd01b88c | 4906 | static int do_md_run(struct mddev *mddev) |
fe60b014 N |
4907 | { |
4908 | int err; | |
4909 | ||
4910 | err = md_run(mddev); | |
4911 | if (err) | |
4912 | goto out; | |
69e51b44 N |
4913 | err = bitmap_load(mddev); |
4914 | if (err) { | |
4915 | bitmap_destroy(mddev); | |
4916 | goto out; | |
4917 | } | |
0fd018af JB |
4918 | |
4919 | md_wakeup_thread(mddev->thread); | |
4920 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
4921 | ||
fe60b014 N |
4922 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4923 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 4924 | mddev->changed = 1; |
fe60b014 N |
4925 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
4926 | out: | |
4927 | return err; | |
4928 | } | |
4929 | ||
fd01b88c | 4930 | static int restart_array(struct mddev *mddev) |
1da177e4 LT |
4931 | { |
4932 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4933 | |
80fab1d7 | 4934 | /* Complain if it has no devices */ |
1da177e4 | 4935 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4936 | return -ENXIO; |
4937 | if (!mddev->pers) | |
4938 | return -EINVAL; | |
4939 | if (!mddev->ro) | |
4940 | return -EBUSY; | |
4941 | mddev->safemode = 0; | |
4942 | mddev->ro = 0; | |
4943 | set_disk_ro(disk, 0); | |
4944 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4945 | mdname(mddev)); | |
4946 | /* Kick recovery or resync if necessary */ | |
4947 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4948 | md_wakeup_thread(mddev->thread); | |
4949 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 4950 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 4951 | return 0; |
1da177e4 LT |
4952 | } |
4953 | ||
acc55e22 N |
4954 | /* similar to deny_write_access, but accounts for our holding a reference |
4955 | * to the file ourselves */ | |
4956 | static int deny_bitmap_write_access(struct file * file) | |
4957 | { | |
4958 | struct inode *inode = file->f_mapping->host; | |
4959 | ||
4960 | spin_lock(&inode->i_lock); | |
4961 | if (atomic_read(&inode->i_writecount) > 1) { | |
4962 | spin_unlock(&inode->i_lock); | |
4963 | return -ETXTBSY; | |
4964 | } | |
4965 | atomic_set(&inode->i_writecount, -1); | |
4966 | spin_unlock(&inode->i_lock); | |
4967 | ||
4968 | return 0; | |
4969 | } | |
4970 | ||
43a70507 | 4971 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4972 | { |
4973 | struct inode *inode = file->f_mapping->host; | |
4974 | ||
4975 | spin_lock(&inode->i_lock); | |
4976 | atomic_set(&inode->i_writecount, 1); | |
4977 | spin_unlock(&inode->i_lock); | |
4978 | } | |
4979 | ||
fd01b88c | 4980 | static void md_clean(struct mddev *mddev) |
6177b472 N |
4981 | { |
4982 | mddev->array_sectors = 0; | |
4983 | mddev->external_size = 0; | |
4984 | mddev->dev_sectors = 0; | |
4985 | mddev->raid_disks = 0; | |
4986 | mddev->recovery_cp = 0; | |
4987 | mddev->resync_min = 0; | |
4988 | mddev->resync_max = MaxSector; | |
4989 | mddev->reshape_position = MaxSector; | |
4990 | mddev->external = 0; | |
4991 | mddev->persistent = 0; | |
4992 | mddev->level = LEVEL_NONE; | |
4993 | mddev->clevel[0] = 0; | |
4994 | mddev->flags = 0; | |
4995 | mddev->ro = 0; | |
4996 | mddev->metadata_type[0] = 0; | |
4997 | mddev->chunk_sectors = 0; | |
4998 | mddev->ctime = mddev->utime = 0; | |
4999 | mddev->layout = 0; | |
5000 | mddev->max_disks = 0; | |
5001 | mddev->events = 0; | |
a8707c08 | 5002 | mddev->can_decrease_events = 0; |
6177b472 N |
5003 | mddev->delta_disks = 0; |
5004 | mddev->new_level = LEVEL_NONE; | |
5005 | mddev->new_layout = 0; | |
5006 | mddev->new_chunk_sectors = 0; | |
5007 | mddev->curr_resync = 0; | |
5008 | mddev->resync_mismatches = 0; | |
5009 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
5010 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
5011 | mddev->recovery = 0; | |
5012 | mddev->in_sync = 0; | |
f0b4f7e2 | 5013 | mddev->changed = 0; |
6177b472 | 5014 | mddev->degraded = 0; |
6177b472 N |
5015 | mddev->safemode = 0; |
5016 | mddev->bitmap_info.offset = 0; | |
5017 | mddev->bitmap_info.default_offset = 0; | |
5018 | mddev->bitmap_info.chunksize = 0; | |
5019 | mddev->bitmap_info.daemon_sleep = 0; | |
5020 | mddev->bitmap_info.max_write_behind = 0; | |
5021 | } | |
5022 | ||
fd01b88c | 5023 | static void __md_stop_writes(struct mddev *mddev) |
a047e125 N |
5024 | { |
5025 | if (mddev->sync_thread) { | |
5026 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
5027 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 5028 | reap_sync_thread(mddev); |
a047e125 N |
5029 | } |
5030 | ||
5031 | del_timer_sync(&mddev->safemode_timer); | |
5032 | ||
5033 | bitmap_flush(mddev); | |
5034 | md_super_wait(mddev); | |
5035 | ||
5036 | if (!mddev->in_sync || mddev->flags) { | |
5037 | /* mark array as shutdown cleanly */ | |
5038 | mddev->in_sync = 1; | |
5039 | md_update_sb(mddev, 1); | |
5040 | } | |
5041 | } | |
defad61a | 5042 | |
fd01b88c | 5043 | void md_stop_writes(struct mddev *mddev) |
defad61a N |
5044 | { |
5045 | mddev_lock(mddev); | |
5046 | __md_stop_writes(mddev); | |
5047 | mddev_unlock(mddev); | |
5048 | } | |
390ee602 | 5049 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 5050 | |
fd01b88c | 5051 | void md_stop(struct mddev *mddev) |
6177b472 | 5052 | { |
0ca69886 | 5053 | mddev->ready = 0; |
6177b472 N |
5054 | mddev->pers->stop(mddev); |
5055 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
5056 | mddev->to_remove = &md_redundancy_group; | |
5057 | module_put(mddev->pers->owner); | |
5058 | mddev->pers = NULL; | |
cca9cf90 | 5059 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5060 | } |
390ee602 | 5061 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5062 | |
fd01b88c | 5063 | static int md_set_readonly(struct mddev *mddev, int is_open) |
a4bd82d0 N |
5064 | { |
5065 | int err = 0; | |
5066 | mutex_lock(&mddev->open_mutex); | |
5067 | if (atomic_read(&mddev->openers) > is_open) { | |
5068 | printk("md: %s still in use.\n",mdname(mddev)); | |
5069 | err = -EBUSY; | |
5070 | goto out; | |
5071 | } | |
5072 | if (mddev->pers) { | |
defad61a | 5073 | __md_stop_writes(mddev); |
a4bd82d0 N |
5074 | |
5075 | err = -ENXIO; | |
5076 | if (mddev->ro==1) | |
5077 | goto out; | |
5078 | mddev->ro = 1; | |
5079 | set_disk_ro(mddev->gendisk, 1); | |
5080 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 5081 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
5082 | err = 0; |
5083 | } | |
5084 | out: | |
5085 | mutex_unlock(&mddev->open_mutex); | |
5086 | return err; | |
5087 | } | |
5088 | ||
9e653b63 N |
5089 | /* mode: |
5090 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5091 | * 2 - stop but do not disassemble array |
5092 | */ | |
fd01b88c | 5093 | static int do_md_stop(struct mddev * mddev, int mode, int is_open) |
1da177e4 | 5094 | { |
1da177e4 | 5095 | struct gendisk *disk = mddev->gendisk; |
3cb03002 | 5096 | struct md_rdev *rdev; |
1da177e4 | 5097 | |
c8c00a69 | 5098 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
5099 | if (atomic_read(&mddev->openers) > is_open || |
5100 | mddev->sysfs_active) { | |
df5b20cf | 5101 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
5102 | mutex_unlock(&mddev->open_mutex); |
5103 | return -EBUSY; | |
5104 | } | |
1da177e4 | 5105 | |
6e17b027 | 5106 | if (mddev->pers) { |
a4bd82d0 N |
5107 | if (mddev->ro) |
5108 | set_disk_ro(disk, 0); | |
409c57f3 | 5109 | |
defad61a | 5110 | __md_stop_writes(mddev); |
a4bd82d0 N |
5111 | md_stop(mddev); |
5112 | mddev->queue->merge_bvec_fn = NULL; | |
a4bd82d0 | 5113 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5114 | |
a4bd82d0 | 5115 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5116 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5117 | |
a4bd82d0 | 5118 | list_for_each_entry(rdev, &mddev->disks, same_set) |
36fad858 NK |
5119 | if (rdev->raid_disk >= 0) |
5120 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5121 | |
a4bd82d0 | 5122 | set_capacity(disk, 0); |
6e17b027 | 5123 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5124 | mddev->changed = 1; |
a4bd82d0 | 5125 | revalidate_disk(disk); |
0d4ca600 | 5126 | |
a4bd82d0 N |
5127 | if (mddev->ro) |
5128 | mddev->ro = 0; | |
6e17b027 N |
5129 | } else |
5130 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5131 | /* |
5132 | * Free resources if final stop | |
5133 | */ | |
9e653b63 | 5134 | if (mode == 0) { |
1da177e4 LT |
5135 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5136 | ||
978f946b | 5137 | bitmap_destroy(mddev); |
c3d9714e N |
5138 | if (mddev->bitmap_info.file) { |
5139 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5140 | fput(mddev->bitmap_info.file); | |
5141 | mddev->bitmap_info.file = NULL; | |
978f946b | 5142 | } |
c3d9714e | 5143 | mddev->bitmap_info.offset = 0; |
978f946b | 5144 | |
1da177e4 LT |
5145 | export_array(mddev); |
5146 | ||
6177b472 | 5147 | md_clean(mddev); |
934d9c23 | 5148 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5149 | if (mddev->hold_active == UNTIL_STOP) |
5150 | mddev->hold_active = 0; | |
a4bd82d0 | 5151 | } |
3f9d99c1 | 5152 | blk_integrity_unregister(disk); |
d7603b7e | 5153 | md_new_event(mddev); |
00bcb4ac | 5154 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5155 | return 0; |
1da177e4 LT |
5156 | } |
5157 | ||
fdee8ae4 | 5158 | #ifndef MODULE |
fd01b88c | 5159 | static void autorun_array(struct mddev *mddev) |
1da177e4 | 5160 | { |
3cb03002 | 5161 | struct md_rdev *rdev; |
1da177e4 LT |
5162 | int err; |
5163 | ||
a757e64c | 5164 | if (list_empty(&mddev->disks)) |
1da177e4 | 5165 | return; |
1da177e4 LT |
5166 | |
5167 | printk(KERN_INFO "md: running: "); | |
5168 | ||
159ec1fc | 5169 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5170 | char b[BDEVNAME_SIZE]; |
5171 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5172 | } | |
5173 | printk("\n"); | |
5174 | ||
d710e138 | 5175 | err = do_md_run(mddev); |
1da177e4 LT |
5176 | if (err) { |
5177 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 5178 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
5179 | } |
5180 | } | |
5181 | ||
5182 | /* | |
5183 | * lets try to run arrays based on all disks that have arrived | |
5184 | * until now. (those are in pending_raid_disks) | |
5185 | * | |
5186 | * the method: pick the first pending disk, collect all disks with | |
5187 | * the same UUID, remove all from the pending list and put them into | |
5188 | * the 'same_array' list. Then order this list based on superblock | |
5189 | * update time (freshest comes first), kick out 'old' disks and | |
5190 | * compare superblocks. If everything's fine then run it. | |
5191 | * | |
5192 | * If "unit" is allocated, then bump its reference count | |
5193 | */ | |
5194 | static void autorun_devices(int part) | |
5195 | { | |
3cb03002 | 5196 | struct md_rdev *rdev0, *rdev, *tmp; |
fd01b88c | 5197 | struct mddev *mddev; |
1da177e4 LT |
5198 | char b[BDEVNAME_SIZE]; |
5199 | ||
5200 | printk(KERN_INFO "md: autorun ...\n"); | |
5201 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5202 | int unit; |
1da177e4 | 5203 | dev_t dev; |
ad01c9e3 | 5204 | LIST_HEAD(candidates); |
1da177e4 | 5205 | rdev0 = list_entry(pending_raid_disks.next, |
3cb03002 | 5206 | struct md_rdev, same_set); |
1da177e4 LT |
5207 | |
5208 | printk(KERN_INFO "md: considering %s ...\n", | |
5209 | bdevname(rdev0->bdev,b)); | |
5210 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5211 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5212 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5213 | printk(KERN_INFO "md: adding %s ...\n", | |
5214 | bdevname(rdev->bdev,b)); | |
5215 | list_move(&rdev->same_set, &candidates); | |
5216 | } | |
5217 | /* | |
5218 | * now we have a set of devices, with all of them having | |
5219 | * mostly sane superblocks. It's time to allocate the | |
5220 | * mddev. | |
5221 | */ | |
e8703fe1 N |
5222 | if (part) { |
5223 | dev = MKDEV(mdp_major, | |
5224 | rdev0->preferred_minor << MdpMinorShift); | |
5225 | unit = MINOR(dev) >> MdpMinorShift; | |
5226 | } else { | |
5227 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5228 | unit = MINOR(dev); | |
5229 | } | |
5230 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5231 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5232 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5233 | break; | |
5234 | } | |
1da177e4 LT |
5235 | |
5236 | md_probe(dev, NULL, NULL); | |
5237 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5238 | if (!mddev || !mddev->gendisk) { |
5239 | if (mddev) | |
5240 | mddev_put(mddev); | |
5241 | printk(KERN_ERR | |
1da177e4 LT |
5242 | "md: cannot allocate memory for md drive.\n"); |
5243 | break; | |
5244 | } | |
5245 | if (mddev_lock(mddev)) | |
5246 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
5247 | mdname(mddev)); | |
5248 | else if (mddev->raid_disks || mddev->major_version | |
5249 | || !list_empty(&mddev->disks)) { | |
5250 | printk(KERN_WARNING | |
5251 | "md: %s already running, cannot run %s\n", | |
5252 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5253 | mddev_unlock(mddev); | |
5254 | } else { | |
5255 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5256 | mddev->persistent = 1; |
159ec1fc | 5257 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5258 | list_del_init(&rdev->same_set); |
5259 | if (bind_rdev_to_array(rdev, mddev)) | |
5260 | export_rdev(rdev); | |
5261 | } | |
5262 | autorun_array(mddev); | |
5263 | mddev_unlock(mddev); | |
5264 | } | |
5265 | /* on success, candidates will be empty, on error | |
5266 | * it won't... | |
5267 | */ | |
159ec1fc | 5268 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5269 | list_del_init(&rdev->same_set); |
1da177e4 | 5270 | export_rdev(rdev); |
4b80991c | 5271 | } |
1da177e4 LT |
5272 | mddev_put(mddev); |
5273 | } | |
5274 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5275 | } | |
fdee8ae4 | 5276 | #endif /* !MODULE */ |
1da177e4 | 5277 | |
1da177e4 LT |
5278 | static int get_version(void __user * arg) |
5279 | { | |
5280 | mdu_version_t ver; | |
5281 | ||
5282 | ver.major = MD_MAJOR_VERSION; | |
5283 | ver.minor = MD_MINOR_VERSION; | |
5284 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5285 | ||
5286 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5287 | return -EFAULT; | |
5288 | ||
5289 | return 0; | |
5290 | } | |
5291 | ||
fd01b88c | 5292 | static int get_array_info(struct mddev * mddev, void __user * arg) |
1da177e4 LT |
5293 | { |
5294 | mdu_array_info_t info; | |
a9f326eb | 5295 | int nr,working,insync,failed,spare; |
3cb03002 | 5296 | struct md_rdev *rdev; |
1da177e4 | 5297 | |
a9f326eb | 5298 | nr=working=insync=failed=spare=0; |
159ec1fc | 5299 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 5300 | nr++; |
b2d444d7 | 5301 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5302 | failed++; |
5303 | else { | |
5304 | working++; | |
b2d444d7 | 5305 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 5306 | insync++; |
1da177e4 LT |
5307 | else |
5308 | spare++; | |
5309 | } | |
5310 | } | |
5311 | ||
5312 | info.major_version = mddev->major_version; | |
5313 | info.minor_version = mddev->minor_version; | |
5314 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5315 | info.ctime = mddev->ctime; | |
5316 | info.level = mddev->level; | |
58c0fed4 AN |
5317 | info.size = mddev->dev_sectors / 2; |
5318 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5319 | info.size = -1; |
1da177e4 LT |
5320 | info.nr_disks = nr; |
5321 | info.raid_disks = mddev->raid_disks; | |
5322 | info.md_minor = mddev->md_minor; | |
5323 | info.not_persistent= !mddev->persistent; | |
5324 | ||
5325 | info.utime = mddev->utime; | |
5326 | info.state = 0; | |
5327 | if (mddev->in_sync) | |
5328 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5329 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5330 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5331 | info.active_disks = insync; |
1da177e4 LT |
5332 | info.working_disks = working; |
5333 | info.failed_disks = failed; | |
5334 | info.spare_disks = spare; | |
5335 | ||
5336 | info.layout = mddev->layout; | |
9d8f0363 | 5337 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5338 | |
5339 | if (copy_to_user(arg, &info, sizeof(info))) | |
5340 | return -EFAULT; | |
5341 | ||
5342 | return 0; | |
5343 | } | |
5344 | ||
fd01b88c | 5345 | static int get_bitmap_file(struct mddev * mddev, void __user * arg) |
32a7627c N |
5346 | { |
5347 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5348 | char *ptr, *buf = NULL; | |
5349 | int err = -ENOMEM; | |
5350 | ||
b5470dc5 DW |
5351 | if (md_allow_write(mddev)) |
5352 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5353 | else | |
5354 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5355 | |
32a7627c N |
5356 | if (!file) |
5357 | goto out; | |
5358 | ||
5359 | /* bitmap disabled, zero the first byte and copy out */ | |
5360 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
5361 | file->pathname[0] = '\0'; | |
5362 | goto copy_out; | |
5363 | } | |
5364 | ||
5365 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5366 | if (!buf) | |
5367 | goto out; | |
5368 | ||
6bcfd601 CH |
5369 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
5370 | if (IS_ERR(ptr)) | |
32a7627c N |
5371 | goto out; |
5372 | ||
5373 | strcpy(file->pathname, ptr); | |
5374 | ||
5375 | copy_out: | |
5376 | err = 0; | |
5377 | if (copy_to_user(arg, file, sizeof(*file))) | |
5378 | err = -EFAULT; | |
5379 | out: | |
5380 | kfree(buf); | |
5381 | kfree(file); | |
5382 | return err; | |
5383 | } | |
5384 | ||
fd01b88c | 5385 | static int get_disk_info(struct mddev * mddev, void __user * arg) |
1da177e4 LT |
5386 | { |
5387 | mdu_disk_info_t info; | |
3cb03002 | 5388 | struct md_rdev *rdev; |
1da177e4 LT |
5389 | |
5390 | if (copy_from_user(&info, arg, sizeof(info))) | |
5391 | return -EFAULT; | |
5392 | ||
26ef379f | 5393 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5394 | if (rdev) { |
5395 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5396 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5397 | info.raid_disk = rdev->raid_disk; | |
5398 | info.state = 0; | |
b2d444d7 | 5399 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5400 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5401 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5402 | info.state |= (1<<MD_DISK_ACTIVE); |
5403 | info.state |= (1<<MD_DISK_SYNC); | |
5404 | } | |
8ddf9efe N |
5405 | if (test_bit(WriteMostly, &rdev->flags)) |
5406 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5407 | } else { |
5408 | info.major = info.minor = 0; | |
5409 | info.raid_disk = -1; | |
5410 | info.state = (1<<MD_DISK_REMOVED); | |
5411 | } | |
5412 | ||
5413 | if (copy_to_user(arg, &info, sizeof(info))) | |
5414 | return -EFAULT; | |
5415 | ||
5416 | return 0; | |
5417 | } | |
5418 | ||
fd01b88c | 5419 | static int add_new_disk(struct mddev * mddev, mdu_disk_info_t *info) |
1da177e4 LT |
5420 | { |
5421 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3cb03002 | 5422 | struct md_rdev *rdev; |
1da177e4 LT |
5423 | dev_t dev = MKDEV(info->major,info->minor); |
5424 | ||
5425 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5426 | return -EOVERFLOW; | |
5427 | ||
5428 | if (!mddev->raid_disks) { | |
5429 | int err; | |
5430 | /* expecting a device which has a superblock */ | |
5431 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5432 | if (IS_ERR(rdev)) { | |
5433 | printk(KERN_WARNING | |
5434 | "md: md_import_device returned %ld\n", | |
5435 | PTR_ERR(rdev)); | |
5436 | return PTR_ERR(rdev); | |
5437 | } | |
5438 | if (!list_empty(&mddev->disks)) { | |
3cb03002 N |
5439 | struct md_rdev *rdev0 |
5440 | = list_entry(mddev->disks.next, | |
5441 | struct md_rdev, same_set); | |
a9f326eb | 5442 | err = super_types[mddev->major_version] |
1da177e4 LT |
5443 | .load_super(rdev, rdev0, mddev->minor_version); |
5444 | if (err < 0) { | |
5445 | printk(KERN_WARNING | |
5446 | "md: %s has different UUID to %s\n", | |
5447 | bdevname(rdev->bdev,b), | |
5448 | bdevname(rdev0->bdev,b2)); | |
5449 | export_rdev(rdev); | |
5450 | return -EINVAL; | |
5451 | } | |
5452 | } | |
5453 | err = bind_rdev_to_array(rdev, mddev); | |
5454 | if (err) | |
5455 | export_rdev(rdev); | |
5456 | return err; | |
5457 | } | |
5458 | ||
5459 | /* | |
5460 | * add_new_disk can be used once the array is assembled | |
5461 | * to add "hot spares". They must already have a superblock | |
5462 | * written | |
5463 | */ | |
5464 | if (mddev->pers) { | |
5465 | int err; | |
5466 | if (!mddev->pers->hot_add_disk) { | |
5467 | printk(KERN_WARNING | |
5468 | "%s: personality does not support diskops!\n", | |
5469 | mdname(mddev)); | |
5470 | return -EINVAL; | |
5471 | } | |
7b1e35f6 N |
5472 | if (mddev->persistent) |
5473 | rdev = md_import_device(dev, mddev->major_version, | |
5474 | mddev->minor_version); | |
5475 | else | |
5476 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5477 | if (IS_ERR(rdev)) { |
5478 | printk(KERN_WARNING | |
5479 | "md: md_import_device returned %ld\n", | |
5480 | PTR_ERR(rdev)); | |
5481 | return PTR_ERR(rdev); | |
5482 | } | |
1a855a06 | 5483 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5484 | if (!mddev->persistent) { |
5485 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5486 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5487 | rdev->raid_disk = info->raid_disk; |
bf572541 N |
5488 | set_bit(In_sync, &rdev->flags); |
5489 | } else | |
41158c7e N |
5490 | rdev->raid_disk = -1; |
5491 | } else | |
5492 | super_types[mddev->major_version]. | |
5493 | validate_super(mddev, rdev); | |
bedd86b7 N |
5494 | if ((info->state & (1<<MD_DISK_SYNC)) && |
5495 | (!test_bit(In_sync, &rdev->flags) || | |
5496 | rdev->raid_disk != info->raid_disk)) { | |
5497 | /* This was a hot-add request, but events doesn't | |
5498 | * match, so reject it. | |
5499 | */ | |
5500 | export_rdev(rdev); | |
5501 | return -EINVAL; | |
5502 | } | |
5503 | ||
1a855a06 N |
5504 | if (test_bit(In_sync, &rdev->flags)) |
5505 | rdev->saved_raid_disk = rdev->raid_disk; | |
5506 | else | |
5507 | rdev->saved_raid_disk = -1; | |
41158c7e | 5508 | |
b2d444d7 | 5509 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5510 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5511 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5512 | else |
5513 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5514 | |
1da177e4 LT |
5515 | rdev->raid_disk = -1; |
5516 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5517 | if (!err && !mddev->pers->hot_remove_disk) { |
5518 | /* If there is hot_add_disk but no hot_remove_disk | |
5519 | * then added disks for geometry changes, | |
5520 | * and should be added immediately. | |
5521 | */ | |
5522 | super_types[mddev->major_version]. | |
5523 | validate_super(mddev, rdev); | |
5524 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5525 | if (err) | |
5526 | unbind_rdev_from_array(rdev); | |
5527 | } | |
1da177e4 LT |
5528 | if (err) |
5529 | export_rdev(rdev); | |
52664732 | 5530 | else |
00bcb4ac | 5531 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5532 | |
17571284 | 5533 | md_update_sb(mddev, 1); |
72a23c21 NB |
5534 | if (mddev->degraded) |
5535 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5536 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5537 | if (!err) |
5538 | md_new_event(mddev); | |
005eca5e | 5539 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5540 | return err; |
5541 | } | |
5542 | ||
5543 | /* otherwise, add_new_disk is only allowed | |
5544 | * for major_version==0 superblocks | |
5545 | */ | |
5546 | if (mddev->major_version != 0) { | |
5547 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5548 | mdname(mddev)); | |
5549 | return -EINVAL; | |
5550 | } | |
5551 | ||
5552 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5553 | int err; | |
d710e138 | 5554 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5555 | if (IS_ERR(rdev)) { |
5556 | printk(KERN_WARNING | |
5557 | "md: error, md_import_device() returned %ld\n", | |
5558 | PTR_ERR(rdev)); | |
5559 | return PTR_ERR(rdev); | |
5560 | } | |
5561 | rdev->desc_nr = info->number; | |
5562 | if (info->raid_disk < mddev->raid_disks) | |
5563 | rdev->raid_disk = info->raid_disk; | |
5564 | else | |
5565 | rdev->raid_disk = -1; | |
5566 | ||
1da177e4 | 5567 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5568 | if (info->state & (1<<MD_DISK_SYNC)) |
5569 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5570 | |
8ddf9efe N |
5571 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5572 | set_bit(WriteMostly, &rdev->flags); | |
5573 | ||
1da177e4 LT |
5574 | if (!mddev->persistent) { |
5575 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5576 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5577 | } else | |
57b2caa3 | 5578 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5579 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5580 | |
2bf071bf N |
5581 | err = bind_rdev_to_array(rdev, mddev); |
5582 | if (err) { | |
5583 | export_rdev(rdev); | |
5584 | return err; | |
5585 | } | |
1da177e4 LT |
5586 | } |
5587 | ||
5588 | return 0; | |
5589 | } | |
5590 | ||
fd01b88c | 5591 | static int hot_remove_disk(struct mddev * mddev, dev_t dev) |
1da177e4 LT |
5592 | { |
5593 | char b[BDEVNAME_SIZE]; | |
3cb03002 | 5594 | struct md_rdev *rdev; |
1da177e4 | 5595 | |
1da177e4 LT |
5596 | rdev = find_rdev(mddev, dev); |
5597 | if (!rdev) | |
5598 | return -ENXIO; | |
5599 | ||
5600 | if (rdev->raid_disk >= 0) | |
5601 | goto busy; | |
5602 | ||
5603 | kick_rdev_from_array(rdev); | |
850b2b42 | 5604 | md_update_sb(mddev, 1); |
d7603b7e | 5605 | md_new_event(mddev); |
1da177e4 LT |
5606 | |
5607 | return 0; | |
5608 | busy: | |
fdefa4d8 | 5609 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5610 | bdevname(rdev->bdev,b), mdname(mddev)); |
5611 | return -EBUSY; | |
5612 | } | |
5613 | ||
fd01b88c | 5614 | static int hot_add_disk(struct mddev * mddev, dev_t dev) |
1da177e4 LT |
5615 | { |
5616 | char b[BDEVNAME_SIZE]; | |
5617 | int err; | |
3cb03002 | 5618 | struct md_rdev *rdev; |
1da177e4 LT |
5619 | |
5620 | if (!mddev->pers) | |
5621 | return -ENODEV; | |
5622 | ||
5623 | if (mddev->major_version != 0) { | |
5624 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5625 | " version-0 superblocks.\n", | |
5626 | mdname(mddev)); | |
5627 | return -EINVAL; | |
5628 | } | |
5629 | if (!mddev->pers->hot_add_disk) { | |
5630 | printk(KERN_WARNING | |
5631 | "%s: personality does not support diskops!\n", | |
5632 | mdname(mddev)); | |
5633 | return -EINVAL; | |
5634 | } | |
5635 | ||
d710e138 | 5636 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5637 | if (IS_ERR(rdev)) { |
5638 | printk(KERN_WARNING | |
5639 | "md: error, md_import_device() returned %ld\n", | |
5640 | PTR_ERR(rdev)); | |
5641 | return -EINVAL; | |
5642 | } | |
5643 | ||
5644 | if (mddev->persistent) | |
57b2caa3 | 5645 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5646 | else |
77304d2a | 5647 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5648 | |
8190e754 | 5649 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5650 | |
b2d444d7 | 5651 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5652 | printk(KERN_WARNING |
5653 | "md: can not hot-add faulty %s disk to %s!\n", | |
5654 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5655 | err = -EINVAL; | |
5656 | goto abort_export; | |
5657 | } | |
b2d444d7 | 5658 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5659 | rdev->desc_nr = -1; |
5842730d | 5660 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5661 | err = bind_rdev_to_array(rdev, mddev); |
5662 | if (err) | |
5663 | goto abort_export; | |
1da177e4 LT |
5664 | |
5665 | /* | |
5666 | * The rest should better be atomic, we can have disk failures | |
5667 | * noticed in interrupt contexts ... | |
5668 | */ | |
5669 | ||
1da177e4 LT |
5670 | rdev->raid_disk = -1; |
5671 | ||
850b2b42 | 5672 | md_update_sb(mddev, 1); |
1da177e4 LT |
5673 | |
5674 | /* | |
5675 | * Kick recovery, maybe this spare has to be added to the | |
5676 | * array immediately. | |
5677 | */ | |
5678 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5679 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5680 | md_new_event(mddev); |
1da177e4 LT |
5681 | return 0; |
5682 | ||
1da177e4 LT |
5683 | abort_export: |
5684 | export_rdev(rdev); | |
5685 | return err; | |
5686 | } | |
5687 | ||
fd01b88c | 5688 | static int set_bitmap_file(struct mddev *mddev, int fd) |
32a7627c N |
5689 | { |
5690 | int err; | |
5691 | ||
36fa3063 N |
5692 | if (mddev->pers) { |
5693 | if (!mddev->pers->quiesce) | |
5694 | return -EBUSY; | |
5695 | if (mddev->recovery || mddev->sync_thread) | |
5696 | return -EBUSY; | |
5697 | /* we should be able to change the bitmap.. */ | |
5698 | } | |
32a7627c | 5699 | |
32a7627c | 5700 | |
36fa3063 N |
5701 | if (fd >= 0) { |
5702 | if (mddev->bitmap) | |
5703 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5704 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5705 | |
c3d9714e | 5706 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5707 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5708 | mdname(mddev)); | |
5709 | return -EBADF; | |
5710 | } | |
5711 | ||
c3d9714e | 5712 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5713 | if (err) { |
5714 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5715 | mdname(mddev)); | |
c3d9714e N |
5716 | fput(mddev->bitmap_info.file); |
5717 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5718 | return err; |
5719 | } | |
c3d9714e | 5720 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5721 | } else if (mddev->bitmap == NULL) |
5722 | return -ENOENT; /* cannot remove what isn't there */ | |
5723 | err = 0; | |
5724 | if (mddev->pers) { | |
5725 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5726 | if (fd >= 0) { |
36fa3063 | 5727 | err = bitmap_create(mddev); |
69e51b44 N |
5728 | if (!err) |
5729 | err = bitmap_load(mddev); | |
5730 | } | |
d7375ab3 | 5731 | if (fd < 0 || err) { |
36fa3063 | 5732 | bitmap_destroy(mddev); |
d7375ab3 N |
5733 | fd = -1; /* make sure to put the file */ |
5734 | } | |
36fa3063 | 5735 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5736 | } |
5737 | if (fd < 0) { | |
c3d9714e N |
5738 | if (mddev->bitmap_info.file) { |
5739 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5740 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5741 | } |
c3d9714e | 5742 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5743 | } |
5744 | ||
32a7627c N |
5745 | return err; |
5746 | } | |
5747 | ||
1da177e4 LT |
5748 | /* |
5749 | * set_array_info is used two different ways | |
5750 | * The original usage is when creating a new array. | |
5751 | * In this usage, raid_disks is > 0 and it together with | |
5752 | * level, size, not_persistent,layout,chunksize determine the | |
5753 | * shape of the array. | |
5754 | * This will always create an array with a type-0.90.0 superblock. | |
5755 | * The newer usage is when assembling an array. | |
5756 | * In this case raid_disks will be 0, and the major_version field is | |
5757 | * use to determine which style super-blocks are to be found on the devices. | |
5758 | * The minor and patch _version numbers are also kept incase the | |
5759 | * super_block handler wishes to interpret them. | |
5760 | */ | |
fd01b88c | 5761 | static int set_array_info(struct mddev * mddev, mdu_array_info_t *info) |
1da177e4 LT |
5762 | { |
5763 | ||
5764 | if (info->raid_disks == 0) { | |
5765 | /* just setting version number for superblock loading */ | |
5766 | if (info->major_version < 0 || | |
50511da3 | 5767 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5768 | super_types[info->major_version].name == NULL) { |
5769 | /* maybe try to auto-load a module? */ | |
5770 | printk(KERN_INFO | |
5771 | "md: superblock version %d not known\n", | |
5772 | info->major_version); | |
5773 | return -EINVAL; | |
5774 | } | |
5775 | mddev->major_version = info->major_version; | |
5776 | mddev->minor_version = info->minor_version; | |
5777 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5778 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5779 | /* ensure mddev_put doesn't delete this now that there |
5780 | * is some minimal configuration. | |
5781 | */ | |
5782 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5783 | return 0; |
5784 | } | |
5785 | mddev->major_version = MD_MAJOR_VERSION; | |
5786 | mddev->minor_version = MD_MINOR_VERSION; | |
5787 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5788 | mddev->ctime = get_seconds(); | |
5789 | ||
5790 | mddev->level = info->level; | |
17115e03 | 5791 | mddev->clevel[0] = 0; |
58c0fed4 | 5792 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5793 | mddev->raid_disks = info->raid_disks; |
5794 | /* don't set md_minor, it is determined by which /dev/md* was | |
5795 | * openned | |
5796 | */ | |
5797 | if (info->state & (1<<MD_SB_CLEAN)) | |
5798 | mddev->recovery_cp = MaxSector; | |
5799 | else | |
5800 | mddev->recovery_cp = 0; | |
5801 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5802 | mddev->external = 0; |
1da177e4 LT |
5803 | |
5804 | mddev->layout = info->layout; | |
9d8f0363 | 5805 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5806 | |
5807 | mddev->max_disks = MD_SB_DISKS; | |
5808 | ||
e691063a N |
5809 | if (mddev->persistent) |
5810 | mddev->flags = 0; | |
850b2b42 | 5811 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5812 | |
c3d9714e N |
5813 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5814 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5815 | |
f6705578 N |
5816 | mddev->reshape_position = MaxSector; |
5817 | ||
1da177e4 LT |
5818 | /* |
5819 | * Generate a 128 bit UUID | |
5820 | */ | |
5821 | get_random_bytes(mddev->uuid, 16); | |
5822 | ||
f6705578 | 5823 | mddev->new_level = mddev->level; |
664e7c41 | 5824 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5825 | mddev->new_layout = mddev->layout; |
5826 | mddev->delta_disks = 0; | |
5827 | ||
1da177e4 LT |
5828 | return 0; |
5829 | } | |
5830 | ||
fd01b88c | 5831 | void md_set_array_sectors(struct mddev *mddev, sector_t array_sectors) |
1f403624 | 5832 | { |
b522adcd DW |
5833 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5834 | ||
5835 | if (mddev->external_size) | |
5836 | return; | |
5837 | ||
1f403624 DW |
5838 | mddev->array_sectors = array_sectors; |
5839 | } | |
5840 | EXPORT_SYMBOL(md_set_array_sectors); | |
5841 | ||
fd01b88c | 5842 | static int update_size(struct mddev *mddev, sector_t num_sectors) |
a35b0d69 | 5843 | { |
3cb03002 | 5844 | struct md_rdev *rdev; |
a35b0d69 | 5845 | int rv; |
d71f9f88 | 5846 | int fit = (num_sectors == 0); |
a35b0d69 N |
5847 | |
5848 | if (mddev->pers->resize == NULL) | |
5849 | return -EINVAL; | |
d71f9f88 AN |
5850 | /* The "num_sectors" is the number of sectors of each device that |
5851 | * is used. This can only make sense for arrays with redundancy. | |
5852 | * linear and raid0 always use whatever space is available. We can only | |
5853 | * consider changing this number if no resync or reconstruction is | |
5854 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5855 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5856 | * of each device. If num_sectors is zero, we find the largest size |
5857 | * that fits. | |
a35b0d69 N |
5858 | */ |
5859 | if (mddev->sync_thread) | |
5860 | return -EBUSY; | |
dba034ee N |
5861 | if (mddev->bitmap) |
5862 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5863 | * grow, and re-add. | |
5864 | */ | |
5865 | return -EBUSY; | |
159ec1fc | 5866 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5867 | sector_t avail = rdev->sectors; |
01ab5662 | 5868 | |
d71f9f88 AN |
5869 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5870 | num_sectors = avail; | |
5871 | if (avail < num_sectors) | |
a35b0d69 N |
5872 | return -ENOSPC; |
5873 | } | |
d71f9f88 | 5874 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5875 | if (!rv) |
5876 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5877 | return rv; |
5878 | } | |
5879 | ||
fd01b88c | 5880 | static int update_raid_disks(struct mddev *mddev, int raid_disks) |
da943b99 N |
5881 | { |
5882 | int rv; | |
5883 | /* change the number of raid disks */ | |
63c70c4f | 5884 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5885 | return -EINVAL; |
5886 | if (raid_disks <= 0 || | |
233fca36 | 5887 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5888 | return -EINVAL; |
63c70c4f | 5889 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5890 | return -EBUSY; |
63c70c4f N |
5891 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5892 | ||
5893 | rv = mddev->pers->check_reshape(mddev); | |
de171cb9 N |
5894 | if (rv < 0) |
5895 | mddev->delta_disks = 0; | |
da943b99 N |
5896 | return rv; |
5897 | } | |
5898 | ||
5899 | ||
1da177e4 LT |
5900 | /* |
5901 | * update_array_info is used to change the configuration of an | |
5902 | * on-line array. | |
5903 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5904 | * fields in the info are checked against the array. | |
5905 | * Any differences that cannot be handled will cause an error. | |
5906 | * Normally, only one change can be managed at a time. | |
5907 | */ | |
fd01b88c | 5908 | static int update_array_info(struct mddev *mddev, mdu_array_info_t *info) |
1da177e4 LT |
5909 | { |
5910 | int rv = 0; | |
5911 | int cnt = 0; | |
36fa3063 N |
5912 | int state = 0; |
5913 | ||
5914 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5915 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5916 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5917 | |
5918 | if (mddev->major_version != info->major_version || | |
5919 | mddev->minor_version != info->minor_version || | |
5920 | /* mddev->patch_version != info->patch_version || */ | |
5921 | mddev->ctime != info->ctime || | |
5922 | mddev->level != info->level || | |
5923 | /* mddev->layout != info->layout || */ | |
5924 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5925 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5926 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5927 | ((state^info->state) & 0xfffffe00) | |
5928 | ) | |
1da177e4 LT |
5929 | return -EINVAL; |
5930 | /* Check there is only one change */ | |
58c0fed4 AN |
5931 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5932 | cnt++; | |
5933 | if (mddev->raid_disks != info->raid_disks) | |
5934 | cnt++; | |
5935 | if (mddev->layout != info->layout) | |
5936 | cnt++; | |
5937 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5938 | cnt++; | |
5939 | if (cnt == 0) | |
5940 | return 0; | |
5941 | if (cnt > 1) | |
5942 | return -EINVAL; | |
1da177e4 LT |
5943 | |
5944 | if (mddev->layout != info->layout) { | |
5945 | /* Change layout | |
5946 | * we don't need to do anything at the md level, the | |
5947 | * personality will take care of it all. | |
5948 | */ | |
50ac168a | 5949 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5950 | return -EINVAL; |
597a711b N |
5951 | else { |
5952 | mddev->new_layout = info->layout; | |
50ac168a | 5953 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5954 | if (rv) |
5955 | mddev->new_layout = mddev->layout; | |
5956 | return rv; | |
5957 | } | |
1da177e4 | 5958 | } |
58c0fed4 | 5959 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5960 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5961 | |
da943b99 N |
5962 | if (mddev->raid_disks != info->raid_disks) |
5963 | rv = update_raid_disks(mddev, info->raid_disks); | |
5964 | ||
36fa3063 N |
5965 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5966 | if (mddev->pers->quiesce == NULL) | |
5967 | return -EINVAL; | |
5968 | if (mddev->recovery || mddev->sync_thread) | |
5969 | return -EBUSY; | |
5970 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5971 | /* add the bitmap */ | |
5972 | if (mddev->bitmap) | |
5973 | return -EEXIST; | |
c3d9714e | 5974 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5975 | return -EINVAL; |
c3d9714e N |
5976 | mddev->bitmap_info.offset = |
5977 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5978 | mddev->pers->quiesce(mddev, 1); |
5979 | rv = bitmap_create(mddev); | |
69e51b44 N |
5980 | if (!rv) |
5981 | rv = bitmap_load(mddev); | |
36fa3063 N |
5982 | if (rv) |
5983 | bitmap_destroy(mddev); | |
5984 | mddev->pers->quiesce(mddev, 0); | |
5985 | } else { | |
5986 | /* remove the bitmap */ | |
5987 | if (!mddev->bitmap) | |
5988 | return -ENOENT; | |
5989 | if (mddev->bitmap->file) | |
5990 | return -EINVAL; | |
5991 | mddev->pers->quiesce(mddev, 1); | |
5992 | bitmap_destroy(mddev); | |
5993 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5994 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5995 | } |
5996 | } | |
850b2b42 | 5997 | md_update_sb(mddev, 1); |
1da177e4 LT |
5998 | return rv; |
5999 | } | |
6000 | ||
fd01b88c | 6001 | static int set_disk_faulty(struct mddev *mddev, dev_t dev) |
1da177e4 | 6002 | { |
3cb03002 | 6003 | struct md_rdev *rdev; |
1da177e4 LT |
6004 | |
6005 | if (mddev->pers == NULL) | |
6006 | return -ENODEV; | |
6007 | ||
6008 | rdev = find_rdev(mddev, dev); | |
6009 | if (!rdev) | |
6010 | return -ENODEV; | |
6011 | ||
6012 | md_error(mddev, rdev); | |
5ef56c8f N |
6013 | if (!test_bit(Faulty, &rdev->flags)) |
6014 | return -EBUSY; | |
1da177e4 LT |
6015 | return 0; |
6016 | } | |
6017 | ||
2f9618ce AN |
6018 | /* |
6019 | * We have a problem here : there is no easy way to give a CHS | |
6020 | * virtual geometry. We currently pretend that we have a 2 heads | |
6021 | * 4 sectors (with a BIG number of cylinders...). This drives | |
6022 | * dosfs just mad... ;-) | |
6023 | */ | |
a885c8c4 CH |
6024 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
6025 | { | |
fd01b88c | 6026 | struct mddev *mddev = bdev->bd_disk->private_data; |
a885c8c4 CH |
6027 | |
6028 | geo->heads = 2; | |
6029 | geo->sectors = 4; | |
49ce6cea | 6030 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
6031 | return 0; |
6032 | } | |
6033 | ||
a39907fa | 6034 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
6035 | unsigned int cmd, unsigned long arg) |
6036 | { | |
6037 | int err = 0; | |
6038 | void __user *argp = (void __user *)arg; | |
fd01b88c | 6039 | struct mddev *mddev = NULL; |
e2218350 | 6040 | int ro; |
1da177e4 LT |
6041 | |
6042 | if (!capable(CAP_SYS_ADMIN)) | |
6043 | return -EACCES; | |
6044 | ||
6045 | /* | |
6046 | * Commands dealing with the RAID driver but not any | |
6047 | * particular array: | |
6048 | */ | |
6049 | switch (cmd) | |
6050 | { | |
6051 | case RAID_VERSION: | |
6052 | err = get_version(argp); | |
6053 | goto done; | |
6054 | ||
6055 | case PRINT_RAID_DEBUG: | |
6056 | err = 0; | |
6057 | md_print_devices(); | |
6058 | goto done; | |
6059 | ||
6060 | #ifndef MODULE | |
6061 | case RAID_AUTORUN: | |
6062 | err = 0; | |
6063 | autostart_arrays(arg); | |
6064 | goto done; | |
6065 | #endif | |
6066 | default:; | |
6067 | } | |
6068 | ||
6069 | /* | |
6070 | * Commands creating/starting a new array: | |
6071 | */ | |
6072 | ||
a39907fa | 6073 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6074 | |
6075 | if (!mddev) { | |
6076 | BUG(); | |
6077 | goto abort; | |
6078 | } | |
6079 | ||
1da177e4 LT |
6080 | err = mddev_lock(mddev); |
6081 | if (err) { | |
6082 | printk(KERN_INFO | |
6083 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
6084 | err, cmd); | |
6085 | goto abort; | |
6086 | } | |
6087 | ||
6088 | switch (cmd) | |
6089 | { | |
6090 | case SET_ARRAY_INFO: | |
6091 | { | |
6092 | mdu_array_info_t info; | |
6093 | if (!arg) | |
6094 | memset(&info, 0, sizeof(info)); | |
6095 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6096 | err = -EFAULT; | |
6097 | goto abort_unlock; | |
6098 | } | |
6099 | if (mddev->pers) { | |
6100 | err = update_array_info(mddev, &info); | |
6101 | if (err) { | |
6102 | printk(KERN_WARNING "md: couldn't update" | |
6103 | " array info. %d\n", err); | |
6104 | goto abort_unlock; | |
6105 | } | |
6106 | goto done_unlock; | |
6107 | } | |
6108 | if (!list_empty(&mddev->disks)) { | |
6109 | printk(KERN_WARNING | |
6110 | "md: array %s already has disks!\n", | |
6111 | mdname(mddev)); | |
6112 | err = -EBUSY; | |
6113 | goto abort_unlock; | |
6114 | } | |
6115 | if (mddev->raid_disks) { | |
6116 | printk(KERN_WARNING | |
6117 | "md: array %s already initialised!\n", | |
6118 | mdname(mddev)); | |
6119 | err = -EBUSY; | |
6120 | goto abort_unlock; | |
6121 | } | |
6122 | err = set_array_info(mddev, &info); | |
6123 | if (err) { | |
6124 | printk(KERN_WARNING "md: couldn't set" | |
6125 | " array info. %d\n", err); | |
6126 | goto abort_unlock; | |
6127 | } | |
6128 | } | |
6129 | goto done_unlock; | |
6130 | ||
6131 | default:; | |
6132 | } | |
6133 | ||
6134 | /* | |
6135 | * Commands querying/configuring an existing array: | |
6136 | */ | |
32a7627c | 6137 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6138 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6139 | if ((!mddev->raid_disks && !mddev->external) |
6140 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6141 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6142 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
6143 | err = -ENODEV; |
6144 | goto abort_unlock; | |
6145 | } | |
6146 | ||
6147 | /* | |
6148 | * Commands even a read-only array can execute: | |
6149 | */ | |
6150 | switch (cmd) | |
6151 | { | |
6152 | case GET_ARRAY_INFO: | |
6153 | err = get_array_info(mddev, argp); | |
6154 | goto done_unlock; | |
6155 | ||
32a7627c | 6156 | case GET_BITMAP_FILE: |
87162a28 | 6157 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
6158 | goto done_unlock; |
6159 | ||
1da177e4 LT |
6160 | case GET_DISK_INFO: |
6161 | err = get_disk_info(mddev, argp); | |
6162 | goto done_unlock; | |
6163 | ||
6164 | case RESTART_ARRAY_RW: | |
6165 | err = restart_array(mddev); | |
6166 | goto done_unlock; | |
6167 | ||
6168 | case STOP_ARRAY: | |
d710e138 | 6169 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
6170 | goto done_unlock; |
6171 | ||
6172 | case STOP_ARRAY_RO: | |
a4bd82d0 | 6173 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
6174 | goto done_unlock; |
6175 | ||
e2218350 DW |
6176 | case BLKROSET: |
6177 | if (get_user(ro, (int __user *)(arg))) { | |
6178 | err = -EFAULT; | |
6179 | goto done_unlock; | |
6180 | } | |
6181 | err = -EINVAL; | |
6182 | ||
6183 | /* if the bdev is going readonly the value of mddev->ro | |
6184 | * does not matter, no writes are coming | |
6185 | */ | |
6186 | if (ro) | |
6187 | goto done_unlock; | |
6188 | ||
6189 | /* are we are already prepared for writes? */ | |
6190 | if (mddev->ro != 1) | |
6191 | goto done_unlock; | |
6192 | ||
6193 | /* transitioning to readauto need only happen for | |
6194 | * arrays that call md_write_start | |
6195 | */ | |
6196 | if (mddev->pers) { | |
6197 | err = restart_array(mddev); | |
6198 | if (err == 0) { | |
6199 | mddev->ro = 2; | |
6200 | set_disk_ro(mddev->gendisk, 0); | |
6201 | } | |
6202 | } | |
6203 | goto done_unlock; | |
1da177e4 LT |
6204 | } |
6205 | ||
6206 | /* | |
6207 | * The remaining ioctls are changing the state of the | |
f91de92e N |
6208 | * superblock, so we do not allow them on read-only arrays. |
6209 | * However non-MD ioctls (e.g. get-size) will still come through | |
6210 | * here and hit the 'default' below, so only disallow | |
6211 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 6212 | */ |
bb57fc64 | 6213 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
6214 | if (mddev->ro == 2) { |
6215 | mddev->ro = 0; | |
00bcb4ac | 6216 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
6217 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
6218 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
6219 | } else { |
6220 | err = -EROFS; | |
6221 | goto abort_unlock; | |
6222 | } | |
1da177e4 LT |
6223 | } |
6224 | ||
6225 | switch (cmd) | |
6226 | { | |
6227 | case ADD_NEW_DISK: | |
6228 | { | |
6229 | mdu_disk_info_t info; | |
6230 | if (copy_from_user(&info, argp, sizeof(info))) | |
6231 | err = -EFAULT; | |
6232 | else | |
6233 | err = add_new_disk(mddev, &info); | |
6234 | goto done_unlock; | |
6235 | } | |
6236 | ||
6237 | case HOT_REMOVE_DISK: | |
6238 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
6239 | goto done_unlock; | |
6240 | ||
6241 | case HOT_ADD_DISK: | |
6242 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
6243 | goto done_unlock; | |
6244 | ||
6245 | case SET_DISK_FAULTY: | |
6246 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
6247 | goto done_unlock; | |
6248 | ||
6249 | case RUN_ARRAY: | |
d710e138 | 6250 | err = do_md_run(mddev); |
1da177e4 LT |
6251 | goto done_unlock; |
6252 | ||
32a7627c N |
6253 | case SET_BITMAP_FILE: |
6254 | err = set_bitmap_file(mddev, (int)arg); | |
6255 | goto done_unlock; | |
6256 | ||
1da177e4 | 6257 | default: |
1da177e4 LT |
6258 | err = -EINVAL; |
6259 | goto abort_unlock; | |
6260 | } | |
6261 | ||
6262 | done_unlock: | |
6263 | abort_unlock: | |
d3374825 N |
6264 | if (mddev->hold_active == UNTIL_IOCTL && |
6265 | err != -EINVAL) | |
6266 | mddev->hold_active = 0; | |
1da177e4 LT |
6267 | mddev_unlock(mddev); |
6268 | ||
6269 | return err; | |
6270 | done: | |
6271 | if (err) | |
6272 | MD_BUG(); | |
6273 | abort: | |
6274 | return err; | |
6275 | } | |
aa98aa31 AB |
6276 | #ifdef CONFIG_COMPAT |
6277 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6278 | unsigned int cmd, unsigned long arg) | |
6279 | { | |
6280 | switch (cmd) { | |
6281 | case HOT_REMOVE_DISK: | |
6282 | case HOT_ADD_DISK: | |
6283 | case SET_DISK_FAULTY: | |
6284 | case SET_BITMAP_FILE: | |
6285 | /* These take in integer arg, do not convert */ | |
6286 | break; | |
6287 | default: | |
6288 | arg = (unsigned long)compat_ptr(arg); | |
6289 | break; | |
6290 | } | |
6291 | ||
6292 | return md_ioctl(bdev, mode, cmd, arg); | |
6293 | } | |
6294 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6295 | |
a39907fa | 6296 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6297 | { |
6298 | /* | |
6299 | * Succeed if we can lock the mddev, which confirms that | |
6300 | * it isn't being stopped right now. | |
6301 | */ | |
fd01b88c | 6302 | struct mddev *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6303 | int err; |
6304 | ||
d3374825 N |
6305 | if (mddev->gendisk != bdev->bd_disk) { |
6306 | /* we are racing with mddev_put which is discarding this | |
6307 | * bd_disk. | |
6308 | */ | |
6309 | mddev_put(mddev); | |
6310 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6311 | flush_workqueue(md_misc_wq); |
d3374825 N |
6312 | /* Then retry the open from the top */ |
6313 | return -ERESTARTSYS; | |
6314 | } | |
6315 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6316 | ||
c8c00a69 | 6317 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6318 | goto out; |
6319 | ||
6320 | err = 0; | |
f2ea68cf | 6321 | atomic_inc(&mddev->openers); |
c8c00a69 | 6322 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6323 | |
f0b4f7e2 | 6324 | check_disk_change(bdev); |
1da177e4 LT |
6325 | out: |
6326 | return err; | |
6327 | } | |
6328 | ||
a39907fa | 6329 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6330 | { |
fd01b88c | 6331 | struct mddev *mddev = disk->private_data; |
1da177e4 | 6332 | |
52e5f9d1 | 6333 | BUG_ON(!mddev); |
f2ea68cf | 6334 | atomic_dec(&mddev->openers); |
1da177e4 LT |
6335 | mddev_put(mddev); |
6336 | ||
6337 | return 0; | |
6338 | } | |
f0b4f7e2 N |
6339 | |
6340 | static int md_media_changed(struct gendisk *disk) | |
6341 | { | |
fd01b88c | 6342 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6343 | |
6344 | return mddev->changed; | |
6345 | } | |
6346 | ||
6347 | static int md_revalidate(struct gendisk *disk) | |
6348 | { | |
fd01b88c | 6349 | struct mddev *mddev = disk->private_data; |
f0b4f7e2 N |
6350 | |
6351 | mddev->changed = 0; | |
6352 | return 0; | |
6353 | } | |
83d5cde4 | 6354 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6355 | { |
6356 | .owner = THIS_MODULE, | |
a39907fa AV |
6357 | .open = md_open, |
6358 | .release = md_release, | |
b492b852 | 6359 | .ioctl = md_ioctl, |
aa98aa31 AB |
6360 | #ifdef CONFIG_COMPAT |
6361 | .compat_ioctl = md_compat_ioctl, | |
6362 | #endif | |
a885c8c4 | 6363 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6364 | .media_changed = md_media_changed, |
6365 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6366 | }; |
6367 | ||
75c96f85 | 6368 | static int md_thread(void * arg) |
1da177e4 | 6369 | { |
2b8bf345 | 6370 | struct md_thread *thread = arg; |
1da177e4 | 6371 | |
1da177e4 LT |
6372 | /* |
6373 | * md_thread is a 'system-thread', it's priority should be very | |
6374 | * high. We avoid resource deadlocks individually in each | |
6375 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6376 | * the very same RT priority as kswapd, thus we will never get | |
6377 | * into a priority inversion deadlock. | |
6378 | * | |
6379 | * we definitely have to have equal or higher priority than | |
6380 | * bdflush, otherwise bdflush will deadlock if there are too | |
6381 | * many dirty RAID5 blocks. | |
6382 | */ | |
1da177e4 | 6383 | |
6985c43f | 6384 | allow_signal(SIGKILL); |
a6fb0934 | 6385 | while (!kthread_should_stop()) { |
1da177e4 | 6386 | |
93588e22 N |
6387 | /* We need to wait INTERRUPTIBLE so that |
6388 | * we don't add to the load-average. | |
6389 | * That means we need to be sure no signals are | |
6390 | * pending | |
6391 | */ | |
6392 | if (signal_pending(current)) | |
6393 | flush_signals(current); | |
6394 | ||
6395 | wait_event_interruptible_timeout | |
6396 | (thread->wqueue, | |
6397 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6398 | || kthread_should_stop(), | |
6399 | thread->timeout); | |
1da177e4 | 6400 | |
6c987910 N |
6401 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6402 | if (!kthread_should_stop()) | |
589a594b | 6403 | thread->run(thread->mddev); |
1da177e4 | 6404 | } |
a6fb0934 | 6405 | |
1da177e4 LT |
6406 | return 0; |
6407 | } | |
6408 | ||
2b8bf345 | 6409 | void md_wakeup_thread(struct md_thread *thread) |
1da177e4 LT |
6410 | { |
6411 | if (thread) { | |
36a4e1fe | 6412 | pr_debug("md: waking up MD thread %s.\n", thread->tsk->comm); |
1da177e4 LT |
6413 | set_bit(THREAD_WAKEUP, &thread->flags); |
6414 | wake_up(&thread->wqueue); | |
6415 | } | |
6416 | } | |
6417 | ||
2b8bf345 | 6418 | struct md_thread *md_register_thread(void (*run) (struct mddev *), struct mddev *mddev, |
1da177e4 LT |
6419 | const char *name) |
6420 | { | |
2b8bf345 | 6421 | struct md_thread *thread; |
1da177e4 | 6422 | |
2b8bf345 | 6423 | thread = kzalloc(sizeof(struct md_thread), GFP_KERNEL); |
1da177e4 LT |
6424 | if (!thread) |
6425 | return NULL; | |
6426 | ||
1da177e4 LT |
6427 | init_waitqueue_head(&thread->wqueue); |
6428 | ||
1da177e4 LT |
6429 | thread->run = run; |
6430 | thread->mddev = mddev; | |
32a7627c | 6431 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6432 | thread->tsk = kthread_run(md_thread, thread, |
6433 | "%s_%s", | |
6434 | mdname(thread->mddev), | |
6435 | name ?: mddev->pers->name); | |
a6fb0934 | 6436 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6437 | kfree(thread); |
6438 | return NULL; | |
6439 | } | |
1da177e4 LT |
6440 | return thread; |
6441 | } | |
6442 | ||
2b8bf345 | 6443 | void md_unregister_thread(struct md_thread **threadp) |
1da177e4 | 6444 | { |
2b8bf345 | 6445 | struct md_thread *thread = *threadp; |
e0cf8f04 N |
6446 | if (!thread) |
6447 | return; | |
36a4e1fe | 6448 | pr_debug("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
01f96c0a N |
6449 | /* Locking ensures that mddev_unlock does not wake_up a |
6450 | * non-existent thread | |
6451 | */ | |
6452 | spin_lock(&pers_lock); | |
6453 | *threadp = NULL; | |
6454 | spin_unlock(&pers_lock); | |
a6fb0934 N |
6455 | |
6456 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6457 | kfree(thread); |
6458 | } | |
6459 | ||
fd01b88c | 6460 | void md_error(struct mddev *mddev, struct md_rdev *rdev) |
1da177e4 LT |
6461 | { |
6462 | if (!mddev) { | |
6463 | MD_BUG(); | |
6464 | return; | |
6465 | } | |
6466 | ||
b2d444d7 | 6467 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6468 | return; |
6bfe0b49 | 6469 | |
de393cde | 6470 | if (!mddev->pers || !mddev->pers->error_handler) |
1da177e4 LT |
6471 | return; |
6472 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6473 | if (mddev->degraded) |
6474 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6475 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6476 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6477 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6478 | md_wakeup_thread(mddev->thread); | |
768a418d | 6479 | if (mddev->event_work.func) |
e804ac78 | 6480 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6481 | md_new_event_inintr(mddev); |
1da177e4 LT |
6482 | } |
6483 | ||
6484 | /* seq_file implementation /proc/mdstat */ | |
6485 | ||
6486 | static void status_unused(struct seq_file *seq) | |
6487 | { | |
6488 | int i = 0; | |
3cb03002 | 6489 | struct md_rdev *rdev; |
1da177e4 LT |
6490 | |
6491 | seq_printf(seq, "unused devices: "); | |
6492 | ||
159ec1fc | 6493 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6494 | char b[BDEVNAME_SIZE]; |
6495 | i++; | |
6496 | seq_printf(seq, "%s ", | |
6497 | bdevname(rdev->bdev,b)); | |
6498 | } | |
6499 | if (!i) | |
6500 | seq_printf(seq, "<none>"); | |
6501 | ||
6502 | seq_printf(seq, "\n"); | |
6503 | } | |
6504 | ||
6505 | ||
fd01b88c | 6506 | static void status_resync(struct seq_file *seq, struct mddev * mddev) |
1da177e4 | 6507 | { |
dd71cf6b N |
6508 | sector_t max_sectors, resync, res; |
6509 | unsigned long dt, db; | |
6510 | sector_t rt; | |
4588b42e N |
6511 | int scale; |
6512 | unsigned int per_milli; | |
1da177e4 | 6513 | |
dd71cf6b | 6514 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6515 | |
6516 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6517 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6518 | else |
dd71cf6b | 6519 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6520 | |
6521 | /* | |
6522 | * Should not happen. | |
6523 | */ | |
dd71cf6b | 6524 | if (!max_sectors) { |
1da177e4 LT |
6525 | MD_BUG(); |
6526 | return; | |
6527 | } | |
4588b42e | 6528 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6529 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6530 | * u32, as those are the requirements for sector_div. |
6531 | * Thus 'scale' must be at least 10 | |
6532 | */ | |
6533 | scale = 10; | |
6534 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6535 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6536 | scale++; |
6537 | } | |
6538 | res = (resync>>scale)*1000; | |
dd71cf6b | 6539 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6540 | |
6541 | per_milli = res; | |
1da177e4 | 6542 | { |
4588b42e | 6543 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6544 | seq_printf(seq, "["); |
6545 | for (i = 0; i < x; i++) | |
6546 | seq_printf(seq, "="); | |
6547 | seq_printf(seq, ">"); | |
6548 | for (i = 0; i < y; i++) | |
6549 | seq_printf(seq, "."); | |
6550 | seq_printf(seq, "] "); | |
6551 | } | |
4588b42e | 6552 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6553 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6554 | "reshape" : | |
61df9d91 N |
6555 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6556 | "check" : | |
6557 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6558 | "resync" : "recovery"))), | |
6559 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6560 | (unsigned long long) resync/2, |
6561 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6562 | |
6563 | /* | |
1da177e4 LT |
6564 | * dt: time from mark until now |
6565 | * db: blocks written from mark until now | |
6566 | * rt: remaining time | |
dd71cf6b N |
6567 | * |
6568 | * rt is a sector_t, so could be 32bit or 64bit. | |
6569 | * So we divide before multiply in case it is 32bit and close | |
6570 | * to the limit. | |
25985edc | 6571 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6572 | * near the end of resync when the number of remaining sectors |
6573 | * is close to 'db'. | |
6574 | * We then divide rt by 32 after multiplying by db to compensate. | |
6575 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6576 | */ |
6577 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6578 | if (!dt) dt++; | |
ff4e8d9a N |
6579 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6580 | - mddev->resync_mark_cnt; | |
1da177e4 | 6581 | |
dd71cf6b N |
6582 | rt = max_sectors - resync; /* number of remaining sectors */ |
6583 | sector_div(rt, db/32+1); | |
6584 | rt *= dt; | |
6585 | rt >>= 5; | |
6586 | ||
6587 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6588 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6589 | |
ff4e8d9a | 6590 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6591 | } |
6592 | ||
6593 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6594 | { | |
6595 | struct list_head *tmp; | |
6596 | loff_t l = *pos; | |
fd01b88c | 6597 | struct mddev *mddev; |
1da177e4 LT |
6598 | |
6599 | if (l >= 0x10000) | |
6600 | return NULL; | |
6601 | if (!l--) | |
6602 | /* header */ | |
6603 | return (void*)1; | |
6604 | ||
6605 | spin_lock(&all_mddevs_lock); | |
6606 | list_for_each(tmp,&all_mddevs) | |
6607 | if (!l--) { | |
fd01b88c | 6608 | mddev = list_entry(tmp, struct mddev, all_mddevs); |
1da177e4 LT |
6609 | mddev_get(mddev); |
6610 | spin_unlock(&all_mddevs_lock); | |
6611 | return mddev; | |
6612 | } | |
6613 | spin_unlock(&all_mddevs_lock); | |
6614 | if (!l--) | |
6615 | return (void*)2;/* tail */ | |
6616 | return NULL; | |
6617 | } | |
6618 | ||
6619 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6620 | { | |
6621 | struct list_head *tmp; | |
fd01b88c | 6622 | struct mddev *next_mddev, *mddev = v; |
1da177e4 LT |
6623 | |
6624 | ++*pos; | |
6625 | if (v == (void*)2) | |
6626 | return NULL; | |
6627 | ||
6628 | spin_lock(&all_mddevs_lock); | |
6629 | if (v == (void*)1) | |
6630 | tmp = all_mddevs.next; | |
6631 | else | |
6632 | tmp = mddev->all_mddevs.next; | |
6633 | if (tmp != &all_mddevs) | |
fd01b88c | 6634 | next_mddev = mddev_get(list_entry(tmp,struct mddev,all_mddevs)); |
1da177e4 LT |
6635 | else { |
6636 | next_mddev = (void*)2; | |
6637 | *pos = 0x10000; | |
6638 | } | |
6639 | spin_unlock(&all_mddevs_lock); | |
6640 | ||
6641 | if (v != (void*)1) | |
6642 | mddev_put(mddev); | |
6643 | return next_mddev; | |
6644 | ||
6645 | } | |
6646 | ||
6647 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6648 | { | |
fd01b88c | 6649 | struct mddev *mddev = v; |
1da177e4 LT |
6650 | |
6651 | if (mddev && v != (void*)1 && v != (void*)2) | |
6652 | mddev_put(mddev); | |
6653 | } | |
6654 | ||
6655 | static int md_seq_show(struct seq_file *seq, void *v) | |
6656 | { | |
fd01b88c | 6657 | struct mddev *mddev = v; |
dd8ac336 | 6658 | sector_t sectors; |
3cb03002 | 6659 | struct md_rdev *rdev; |
32a7627c | 6660 | struct bitmap *bitmap; |
1da177e4 LT |
6661 | |
6662 | if (v == (void*)1) { | |
84fc4b56 | 6663 | struct md_personality *pers; |
1da177e4 LT |
6664 | seq_printf(seq, "Personalities : "); |
6665 | spin_lock(&pers_lock); | |
2604b703 N |
6666 | list_for_each_entry(pers, &pers_list, list) |
6667 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6668 | |
6669 | spin_unlock(&pers_lock); | |
6670 | seq_printf(seq, "\n"); | |
f1514638 | 6671 | seq->poll_event = atomic_read(&md_event_count); |
1da177e4 LT |
6672 | return 0; |
6673 | } | |
6674 | if (v == (void*)2) { | |
6675 | status_unused(seq); | |
6676 | return 0; | |
6677 | } | |
6678 | ||
5dc5cf7d | 6679 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6680 | return -EINTR; |
5dc5cf7d | 6681 | |
1da177e4 LT |
6682 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6683 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6684 | mddev->pers ? "" : "in"); | |
6685 | if (mddev->pers) { | |
f91de92e | 6686 | if (mddev->ro==1) |
1da177e4 | 6687 | seq_printf(seq, " (read-only)"); |
f91de92e | 6688 | if (mddev->ro==2) |
52720ae7 | 6689 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6690 | seq_printf(seq, " %s", mddev->pers->name); |
6691 | } | |
6692 | ||
dd8ac336 | 6693 | sectors = 0; |
159ec1fc | 6694 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6695 | char b[BDEVNAME_SIZE]; |
6696 | seq_printf(seq, " %s[%d]", | |
6697 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6698 | if (test_bit(WriteMostly, &rdev->flags)) |
6699 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6700 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6701 | seq_printf(seq, "(F)"); |
6702 | continue; | |
b325a32e N |
6703 | } else if (rdev->raid_disk < 0) |
6704 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6705 | sectors += rdev->sectors; |
1da177e4 LT |
6706 | } |
6707 | ||
6708 | if (!list_empty(&mddev->disks)) { | |
6709 | if (mddev->pers) | |
6710 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6711 | (unsigned long long) |
6712 | mddev->array_sectors / 2); | |
1da177e4 LT |
6713 | else |
6714 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6715 | (unsigned long long)sectors / 2); |
1da177e4 | 6716 | } |
1cd6bf19 N |
6717 | if (mddev->persistent) { |
6718 | if (mddev->major_version != 0 || | |
6719 | mddev->minor_version != 90) { | |
6720 | seq_printf(seq," super %d.%d", | |
6721 | mddev->major_version, | |
6722 | mddev->minor_version); | |
6723 | } | |
e691063a N |
6724 | } else if (mddev->external) |
6725 | seq_printf(seq, " super external:%s", | |
6726 | mddev->metadata_type); | |
6727 | else | |
1cd6bf19 | 6728 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6729 | |
6730 | if (mddev->pers) { | |
d710e138 | 6731 | mddev->pers->status(seq, mddev); |
1da177e4 | 6732 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6733 | if (mddev->pers->sync_request) { |
6734 | if (mddev->curr_resync > 2) { | |
d710e138 | 6735 | status_resync(seq, mddev); |
8e1b39d6 N |
6736 | seq_printf(seq, "\n "); |
6737 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6738 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6739 | else if (mddev->recovery_cp < MaxSector) | |
6740 | seq_printf(seq, "\tresync=PENDING\n "); | |
6741 | } | |
32a7627c N |
6742 | } else |
6743 | seq_printf(seq, "\n "); | |
6744 | ||
6745 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6746 | unsigned long chunk_kb; |
6747 | unsigned long flags; | |
32a7627c | 6748 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6749 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6750 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6751 | "%lu%s chunk", | |
6752 | bitmap->pages - bitmap->missing_pages, | |
6753 | bitmap->pages, | |
6754 | (bitmap->pages - bitmap->missing_pages) | |
6755 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6756 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6757 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6758 | if (bitmap->file) { |
6759 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6760 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6761 | } |
78d742d8 | 6762 | |
32a7627c N |
6763 | seq_printf(seq, "\n"); |
6764 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6765 | } |
6766 | ||
6767 | seq_printf(seq, "\n"); | |
6768 | } | |
6769 | mddev_unlock(mddev); | |
6770 | ||
6771 | return 0; | |
6772 | } | |
6773 | ||
110518bc | 6774 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6775 | .start = md_seq_start, |
6776 | .next = md_seq_next, | |
6777 | .stop = md_seq_stop, | |
6778 | .show = md_seq_show, | |
6779 | }; | |
6780 | ||
6781 | static int md_seq_open(struct inode *inode, struct file *file) | |
6782 | { | |
f1514638 | 6783 | struct seq_file *seq; |
1da177e4 LT |
6784 | int error; |
6785 | ||
6786 | error = seq_open(file, &md_seq_ops); | |
d7603b7e | 6787 | if (error) |
f1514638 KS |
6788 | return error; |
6789 | ||
6790 | seq = file->private_data; | |
6791 | seq->poll_event = atomic_read(&md_event_count); | |
1da177e4 LT |
6792 | return error; |
6793 | } | |
6794 | ||
d7603b7e N |
6795 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6796 | { | |
f1514638 | 6797 | struct seq_file *seq = filp->private_data; |
d7603b7e N |
6798 | int mask; |
6799 | ||
6800 | poll_wait(filp, &md_event_waiters, wait); | |
6801 | ||
6802 | /* always allow read */ | |
6803 | mask = POLLIN | POLLRDNORM; | |
6804 | ||
f1514638 | 6805 | if (seq->poll_event != atomic_read(&md_event_count)) |
d7603b7e N |
6806 | mask |= POLLERR | POLLPRI; |
6807 | return mask; | |
6808 | } | |
6809 | ||
fa027c2a | 6810 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6811 | .owner = THIS_MODULE, |
1da177e4 LT |
6812 | .open = md_seq_open, |
6813 | .read = seq_read, | |
6814 | .llseek = seq_lseek, | |
c3f94b40 | 6815 | .release = seq_release_private, |
d7603b7e | 6816 | .poll = mdstat_poll, |
1da177e4 LT |
6817 | }; |
6818 | ||
84fc4b56 | 6819 | int register_md_personality(struct md_personality *p) |
1da177e4 | 6820 | { |
1da177e4 | 6821 | spin_lock(&pers_lock); |
2604b703 N |
6822 | list_add_tail(&p->list, &pers_list); |
6823 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6824 | spin_unlock(&pers_lock); |
6825 | return 0; | |
6826 | } | |
6827 | ||
84fc4b56 | 6828 | int unregister_md_personality(struct md_personality *p) |
1da177e4 | 6829 | { |
2604b703 | 6830 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6831 | spin_lock(&pers_lock); |
2604b703 | 6832 | list_del_init(&p->list); |
1da177e4 LT |
6833 | spin_unlock(&pers_lock); |
6834 | return 0; | |
6835 | } | |
6836 | ||
fd01b88c | 6837 | static int is_mddev_idle(struct mddev *mddev, int init) |
1da177e4 | 6838 | { |
3cb03002 | 6839 | struct md_rdev * rdev; |
1da177e4 | 6840 | int idle; |
eea1bf38 | 6841 | int curr_events; |
1da177e4 LT |
6842 | |
6843 | idle = 1; | |
4b80991c N |
6844 | rcu_read_lock(); |
6845 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6846 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6847 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6848 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6849 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6850 | /* sync IO will cause sync_io to increase before the disk_stats |
6851 | * as sync_io is counted when a request starts, and | |
6852 | * disk_stats is counted when it completes. | |
6853 | * So resync activity will cause curr_events to be smaller than | |
6854 | * when there was no such activity. | |
6855 | * non-sync IO will cause disk_stat to increase without | |
6856 | * increasing sync_io so curr_events will (eventually) | |
6857 | * be larger than it was before. Once it becomes | |
6858 | * substantially larger, the test below will cause | |
6859 | * the array to appear non-idle, and resync will slow | |
6860 | * down. | |
6861 | * If there is a lot of outstanding resync activity when | |
6862 | * we set last_event to curr_events, then all that activity | |
6863 | * completing might cause the array to appear non-idle | |
6864 | * and resync will be slowed down even though there might | |
6865 | * not have been non-resync activity. This will only | |
6866 | * happen once though. 'last_events' will soon reflect | |
6867 | * the state where there is little or no outstanding | |
6868 | * resync requests, and further resync activity will | |
6869 | * always make curr_events less than last_events. | |
c0e48521 | 6870 | * |
1da177e4 | 6871 | */ |
eea1bf38 | 6872 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6873 | rdev->last_events = curr_events; |
6874 | idle = 0; | |
6875 | } | |
6876 | } | |
4b80991c | 6877 | rcu_read_unlock(); |
1da177e4 LT |
6878 | return idle; |
6879 | } | |
6880 | ||
fd01b88c | 6881 | void md_done_sync(struct mddev *mddev, int blocks, int ok) |
1da177e4 LT |
6882 | { |
6883 | /* another "blocks" (512byte) blocks have been synced */ | |
6884 | atomic_sub(blocks, &mddev->recovery_active); | |
6885 | wake_up(&mddev->recovery_wait); | |
6886 | if (!ok) { | |
dfc70645 | 6887 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6888 | md_wakeup_thread(mddev->thread); |
6889 | // stop recovery, signal do_sync .... | |
6890 | } | |
6891 | } | |
6892 | ||
6893 | ||
06d91a5f N |
6894 | /* md_write_start(mddev, bi) |
6895 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6896 | * in superblock) before writing, schedule a superblock update |
6897 | * and wait for it to complete. | |
06d91a5f | 6898 | */ |
fd01b88c | 6899 | void md_write_start(struct mddev *mddev, struct bio *bi) |
1da177e4 | 6900 | { |
0fd62b86 | 6901 | int did_change = 0; |
06d91a5f | 6902 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6903 | return; |
06d91a5f | 6904 | |
f91de92e N |
6905 | BUG_ON(mddev->ro == 1); |
6906 | if (mddev->ro == 2) { | |
6907 | /* need to switch to read/write */ | |
6908 | mddev->ro = 0; | |
6909 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6910 | md_wakeup_thread(mddev->thread); | |
25156198 | 6911 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6912 | did_change = 1; |
f91de92e | 6913 | } |
06d91a5f | 6914 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6915 | if (mddev->safemode == 1) |
6916 | mddev->safemode = 0; | |
06d91a5f | 6917 | if (mddev->in_sync) { |
a9701a30 | 6918 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6919 | if (mddev->in_sync) { |
6920 | mddev->in_sync = 0; | |
850b2b42 | 6921 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 6922 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 6923 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6924 | did_change = 1; |
3d310eb7 | 6925 | } |
a9701a30 | 6926 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6927 | } |
0fd62b86 | 6928 | if (did_change) |
00bcb4ac | 6929 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 6930 | wait_event(mddev->sb_wait, |
09a44cc1 | 6931 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
6932 | } |
6933 | ||
fd01b88c | 6934 | void md_write_end(struct mddev *mddev) |
1da177e4 LT |
6935 | { |
6936 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6937 | if (mddev->safemode == 2) | |
6938 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6939 | else if (mddev->safemode_delay) |
1da177e4 LT |
6940 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6941 | } | |
6942 | } | |
6943 | ||
2a2275d6 N |
6944 | /* md_allow_write(mddev) |
6945 | * Calling this ensures that the array is marked 'active' so that writes | |
6946 | * may proceed without blocking. It is important to call this before | |
6947 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6948 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6949 | * |
6950 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6951 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6952 | */ |
fd01b88c | 6953 | int md_allow_write(struct mddev *mddev) |
2a2275d6 N |
6954 | { |
6955 | if (!mddev->pers) | |
b5470dc5 | 6956 | return 0; |
2a2275d6 | 6957 | if (mddev->ro) |
b5470dc5 | 6958 | return 0; |
1a0fd497 | 6959 | if (!mddev->pers->sync_request) |
b5470dc5 | 6960 | return 0; |
2a2275d6 N |
6961 | |
6962 | spin_lock_irq(&mddev->write_lock); | |
6963 | if (mddev->in_sync) { | |
6964 | mddev->in_sync = 0; | |
6965 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 6966 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
6967 | if (mddev->safemode_delay && |
6968 | mddev->safemode == 0) | |
6969 | mddev->safemode = 1; | |
6970 | spin_unlock_irq(&mddev->write_lock); | |
6971 | md_update_sb(mddev, 0); | |
00bcb4ac | 6972 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
6973 | } else |
6974 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 6975 | |
070dc6dd | 6976 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
6977 | return -EAGAIN; |
6978 | else | |
6979 | return 0; | |
2a2275d6 N |
6980 | } |
6981 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6982 | ||
1da177e4 LT |
6983 | #define SYNC_MARKS 10 |
6984 | #define SYNC_MARK_STEP (3*HZ) | |
fd01b88c | 6985 | void md_do_sync(struct mddev *mddev) |
1da177e4 | 6986 | { |
fd01b88c | 6987 | struct mddev *mddev2; |
1da177e4 LT |
6988 | unsigned int currspeed = 0, |
6989 | window; | |
57afd89f | 6990 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6991 | unsigned long mark[SYNC_MARKS]; |
6992 | sector_t mark_cnt[SYNC_MARKS]; | |
6993 | int last_mark,m; | |
6994 | struct list_head *tmp; | |
6995 | sector_t last_check; | |
57afd89f | 6996 | int skipped = 0; |
3cb03002 | 6997 | struct md_rdev *rdev; |
61df9d91 | 6998 | char *desc; |
1da177e4 LT |
6999 | |
7000 | /* just incase thread restarts... */ | |
7001 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
7002 | return; | |
5fd6c1dc N |
7003 | if (mddev->ro) /* never try to sync a read-only array */ |
7004 | return; | |
1da177e4 | 7005 | |
61df9d91 N |
7006 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
7007 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
7008 | desc = "data-check"; | |
7009 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7010 | desc = "requested-resync"; | |
7011 | else | |
7012 | desc = "resync"; | |
7013 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
7014 | desc = "reshape"; | |
7015 | else | |
7016 | desc = "recovery"; | |
7017 | ||
1da177e4 LT |
7018 | /* we overload curr_resync somewhat here. |
7019 | * 0 == not engaged in resync at all | |
7020 | * 2 == checking that there is no conflict with another sync | |
7021 | * 1 == like 2, but have yielded to allow conflicting resync to | |
7022 | * commense | |
7023 | * other == active in resync - this many blocks | |
7024 | * | |
7025 | * Before starting a resync we must have set curr_resync to | |
7026 | * 2, and then checked that every "conflicting" array has curr_resync | |
7027 | * less than ours. When we find one that is the same or higher | |
7028 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
7029 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
7030 | * This will mean we have to start checking from the beginning again. | |
7031 | * | |
7032 | */ | |
7033 | ||
7034 | do { | |
7035 | mddev->curr_resync = 2; | |
7036 | ||
7037 | try_again: | |
404e4b43 | 7038 | if (kthread_should_stop()) |
6985c43f | 7039 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
7040 | |
7041 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 7042 | goto skip; |
29ac4aa3 | 7043 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
7044 | if (mddev2 == mddev) |
7045 | continue; | |
90b08710 BS |
7046 | if (!mddev->parallel_resync |
7047 | && mddev2->curr_resync | |
7048 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7049 | DEFINE_WAIT(wq); |
7050 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7051 | /* arbitrarily yield */ | |
7052 | mddev->curr_resync = 1; | |
7053 | wake_up(&resync_wait); | |
7054 | } | |
7055 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7056 | /* no need to wait here, we can wait the next | |
7057 | * time 'round when curr_resync == 2 | |
7058 | */ | |
7059 | continue; | |
9744197c N |
7060 | /* We need to wait 'interruptible' so as not to |
7061 | * contribute to the load average, and not to | |
7062 | * be caught by 'softlockup' | |
7063 | */ | |
7064 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 7065 | if (!kthread_should_stop() && |
8712e553 | 7066 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7067 | printk(KERN_INFO "md: delaying %s of %s" |
7068 | " until %s has finished (they" | |
1da177e4 | 7069 | " share one or more physical units)\n", |
61df9d91 | 7070 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7071 | mddev_put(mddev2); |
9744197c N |
7072 | if (signal_pending(current)) |
7073 | flush_signals(current); | |
1da177e4 LT |
7074 | schedule(); |
7075 | finish_wait(&resync_wait, &wq); | |
7076 | goto try_again; | |
7077 | } | |
7078 | finish_wait(&resync_wait, &wq); | |
7079 | } | |
7080 | } | |
7081 | } while (mddev->curr_resync < 2); | |
7082 | ||
5fd6c1dc | 7083 | j = 0; |
9d88883e | 7084 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7085 | /* resync follows the size requested by the personality, |
57afd89f | 7086 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7087 | */ |
7088 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 7089 | mddev->resync_mismatches = 0; |
5fd6c1dc | 7090 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7091 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7092 | j = mddev->resync_min; | |
7093 | else if (!mddev->bitmap) | |
5fd6c1dc | 7094 | j = mddev->recovery_cp; |
5e96ee65 | 7095 | |
ccfcc3c1 | 7096 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 7097 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7098 | else { |
1da177e4 | 7099 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7100 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7101 | j = MaxSector; |
4e59ca7d DW |
7102 | rcu_read_lock(); |
7103 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
7104 | if (rdev->raid_disk >= 0 && |
7105 | !test_bit(Faulty, &rdev->flags) && | |
7106 | !test_bit(In_sync, &rdev->flags) && | |
7107 | rdev->recovery_offset < j) | |
7108 | j = rdev->recovery_offset; | |
4e59ca7d | 7109 | rcu_read_unlock(); |
5fd6c1dc | 7110 | } |
1da177e4 | 7111 | |
61df9d91 N |
7112 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7113 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7114 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7115 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7116 | "(but not more than %d KB/sec) for %s.\n", |
7117 | speed_max(mddev), desc); | |
1da177e4 | 7118 | |
eea1bf38 | 7119 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7120 | |
57afd89f | 7121 | io_sectors = 0; |
1da177e4 LT |
7122 | for (m = 0; m < SYNC_MARKS; m++) { |
7123 | mark[m] = jiffies; | |
57afd89f | 7124 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7125 | } |
7126 | last_mark = 0; | |
7127 | mddev->resync_mark = mark[last_mark]; | |
7128 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7129 | ||
7130 | /* | |
7131 | * Tune reconstruction: | |
7132 | */ | |
7133 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7134 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7135 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7136 | |
7137 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7138 | last_check = 0; |
7139 | ||
7140 | if (j>2) { | |
7141 | printk(KERN_INFO | |
61df9d91 N |
7142 | "md: resuming %s of %s from checkpoint.\n", |
7143 | desc, mdname(mddev)); | |
1da177e4 LT |
7144 | mddev->curr_resync = j; |
7145 | } | |
75d3da43 | 7146 | mddev->curr_resync_completed = j; |
1da177e4 LT |
7147 | |
7148 | while (j < max_sectors) { | |
57afd89f | 7149 | sector_t sectors; |
1da177e4 | 7150 | |
57afd89f | 7151 | skipped = 0; |
97e4f42d | 7152 | |
7a91ee1f N |
7153 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7154 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7155 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7156 | > (max_sectors >> 4)) || | |
7157 | (j - mddev->curr_resync_completed)*2 | |
7158 | >= mddev->resync_max - mddev->curr_resync_completed | |
7159 | )) { | |
97e4f42d | 7160 | /* time to update curr_resync_completed */ |
97e4f42d N |
7161 | wait_event(mddev->recovery_wait, |
7162 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7163 | mddev->curr_resync_completed = j; |
070dc6dd | 7164 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7165 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7166 | } |
acb180b0 | 7167 | |
e62e58a5 N |
7168 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
7169 | /* As this condition is controlled by user-space, | |
7170 | * we can block indefinitely, so use '_interruptible' | |
7171 | * to avoid triggering warnings. | |
7172 | */ | |
7173 | flush_signals(current); /* just in case */ | |
7174 | wait_event_interruptible(mddev->recovery_wait, | |
7175 | mddev->resync_max > j | |
7176 | || kthread_should_stop()); | |
7177 | } | |
acb180b0 N |
7178 | |
7179 | if (kthread_should_stop()) | |
7180 | goto interrupted; | |
7181 | ||
57afd89f | 7182 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7183 | currspeed < speed_min(mddev)); |
57afd89f | 7184 | if (sectors == 0) { |
dfc70645 | 7185 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
7186 | goto out; |
7187 | } | |
57afd89f N |
7188 | |
7189 | if (!skipped) { /* actual IO requested */ | |
7190 | io_sectors += sectors; | |
7191 | atomic_add(sectors, &mddev->recovery_active); | |
7192 | } | |
7193 | ||
e875ecea N |
7194 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
7195 | break; | |
7196 | ||
1da177e4 LT |
7197 | j += sectors; |
7198 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 7199 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e | 7200 | if (last_check == 0) |
e875ecea | 7201 | /* this is the earliest that rebuild will be |
d7603b7e N |
7202 | * visible in /proc/mdstat |
7203 | */ | |
7204 | md_new_event(mddev); | |
57afd89f N |
7205 | |
7206 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7207 | continue; |
7208 | ||
57afd89f | 7209 | last_check = io_sectors; |
1da177e4 LT |
7210 | repeat: |
7211 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7212 | /* step marks */ | |
7213 | int next = (last_mark+1) % SYNC_MARKS; | |
7214 | ||
7215 | mddev->resync_mark = mark[next]; | |
7216 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7217 | mark[next] = jiffies; | |
57afd89f | 7218 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7219 | last_mark = next; |
7220 | } | |
7221 | ||
7222 | ||
c6207277 N |
7223 | if (kthread_should_stop()) |
7224 | goto interrupted; | |
7225 | ||
1da177e4 LT |
7226 | |
7227 | /* | |
7228 | * this loop exits only if either when we are slower than | |
7229 | * the 'hard' speed limit, or the system was IO-idle for | |
7230 | * a jiffy. | |
7231 | * the system might be non-idle CPU-wise, but we only care | |
7232 | * about not overloading the IO subsystem. (things like an | |
7233 | * e2fsck being done on the RAID array should execute fast) | |
7234 | */ | |
1da177e4 LT |
7235 | cond_resched(); |
7236 | ||
57afd89f N |
7237 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
7238 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 7239 | |
88202a0c N |
7240 | if (currspeed > speed_min(mddev)) { |
7241 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7242 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7243 | msleep(500); |
1da177e4 LT |
7244 | goto repeat; |
7245 | } | |
7246 | } | |
7247 | } | |
61df9d91 | 7248 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
7249 | /* |
7250 | * this also signals 'finished resyncing' to md_stop | |
7251 | */ | |
7252 | out: | |
1da177e4 LT |
7253 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7254 | ||
7255 | /* tell personality that we are finished */ | |
57afd89f | 7256 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7257 | |
dfc70645 | 7258 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7259 | mddev->curr_resync > 2) { |
7260 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7261 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7262 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7263 | printk(KERN_INFO | |
61df9d91 N |
7264 | "md: checkpointing %s of %s.\n", |
7265 | desc, mdname(mddev)); | |
5fd6c1dc N |
7266 | mddev->recovery_cp = mddev->curr_resync; |
7267 | } | |
7268 | } else | |
7269 | mddev->recovery_cp = MaxSector; | |
7270 | } else { | |
7271 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7272 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
7273 | rcu_read_lock(); |
7274 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 7275 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7276 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7277 | !test_bit(Faulty, &rdev->flags) && |
7278 | !test_bit(In_sync, &rdev->flags) && | |
7279 | rdev->recovery_offset < mddev->curr_resync) | |
7280 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7281 | rcu_read_unlock(); |
5fd6c1dc | 7282 | } |
1da177e4 | 7283 | } |
17571284 | 7284 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7285 | |
1da177e4 | 7286 | skip: |
c07b70ad N |
7287 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7288 | /* We completed so min/max setting can be forgotten if used. */ | |
7289 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7290 | mddev->resync_min = 0; | |
7291 | mddev->resync_max = MaxSector; | |
7292 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7293 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7294 | mddev->curr_resync = 0; |
7295 | wake_up(&resync_wait); | |
7296 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7297 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
7298 | return; |
7299 | ||
7300 | interrupted: | |
7301 | /* | |
7302 | * got a signal, exit. | |
7303 | */ | |
7304 | printk(KERN_INFO | |
7305 | "md: md_do_sync() got signal ... exiting\n"); | |
7306 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7307 | goto out; | |
7308 | ||
1da177e4 | 7309 | } |
29269553 | 7310 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7311 | |
fd01b88c | 7312 | static int remove_and_add_spares(struct mddev *mddev) |
b4c4c7b8 | 7313 | { |
3cb03002 | 7314 | struct md_rdev *rdev; |
b4c4c7b8 N |
7315 | int spares = 0; |
7316 | ||
97e4f42d N |
7317 | mddev->curr_resync_completed = 0; |
7318 | ||
159ec1fc | 7319 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 7320 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 7321 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7322 | (test_bit(Faulty, &rdev->flags) || |
7323 | ! test_bit(In_sync, &rdev->flags)) && | |
7324 | atomic_read(&rdev->nr_pending)==0) { | |
7325 | if (mddev->pers->hot_remove_disk( | |
7326 | mddev, rdev->raid_disk)==0) { | |
36fad858 | 7327 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 N |
7328 | rdev->raid_disk = -1; |
7329 | } | |
7330 | } | |
7331 | ||
5389042f | 7332 | if (mddev->degraded) { |
159ec1fc | 7333 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 7334 | if (rdev->raid_disk >= 0 && |
e5427135 | 7335 | !test_bit(In_sync, &rdev->flags) && |
de393cde | 7336 | !test_bit(Faulty, &rdev->flags)) |
dfc70645 | 7337 | spares++; |
b4c4c7b8 N |
7338 | if (rdev->raid_disk < 0 |
7339 | && !test_bit(Faulty, &rdev->flags)) { | |
7340 | rdev->recovery_offset = 0; | |
199050ea NB |
7341 | if (mddev->pers-> |
7342 | hot_add_disk(mddev, rdev) == 0) { | |
36fad858 | 7343 | if (sysfs_link_rdev(mddev, rdev)) |
00bcb4ac | 7344 | /* failure here is OK */; |
b4c4c7b8 N |
7345 | spares++; |
7346 | md_new_event(mddev); | |
93be75ff | 7347 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
7348 | } else |
7349 | break; | |
7350 | } | |
dfc70645 | 7351 | } |
b4c4c7b8 N |
7352 | } |
7353 | return spares; | |
7354 | } | |
7ebc0be7 | 7355 | |
fd01b88c | 7356 | static void reap_sync_thread(struct mddev *mddev) |
7ebc0be7 | 7357 | { |
3cb03002 | 7358 | struct md_rdev *rdev; |
7ebc0be7 N |
7359 | |
7360 | /* resync has finished, collect result */ | |
01f96c0a | 7361 | md_unregister_thread(&mddev->sync_thread); |
7ebc0be7 N |
7362 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
7363 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7364 | /* success...*/ | |
7365 | /* activate any spares */ | |
7366 | if (mddev->pers->spare_active(mddev)) | |
7367 | sysfs_notify(&mddev->kobj, NULL, | |
7368 | "degraded"); | |
7369 | } | |
7370 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7371 | mddev->pers->finish_reshape) | |
7372 | mddev->pers->finish_reshape(mddev); | |
7ebc0be7 | 7373 | |
d70ed2e4 AW |
7374 | /* If array is no-longer degraded, then any saved_raid_disk |
7375 | * information must be scrapped. Also if any device is now | |
7376 | * In_sync we must scrape the saved_raid_disk for that device | |
7377 | * do the superblock for an incrementally recovered device | |
7378 | * written out. | |
7ebc0be7 | 7379 | */ |
d70ed2e4 AW |
7380 | list_for_each_entry(rdev, &mddev->disks, same_set) |
7381 | if (!mddev->degraded || | |
7382 | test_bit(In_sync, &rdev->flags)) | |
7ebc0be7 N |
7383 | rdev->saved_raid_disk = -1; |
7384 | ||
d70ed2e4 | 7385 | md_update_sb(mddev, 1); |
7ebc0be7 N |
7386 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7387 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7388 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7389 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7390 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7391 | /* flag recovery needed just to double check */ | |
7392 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7393 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7394 | md_new_event(mddev); | |
768e587e JB |
7395 | if (mddev->event_work.func) |
7396 | queue_work(md_misc_wq, &mddev->event_work); | |
7ebc0be7 N |
7397 | } |
7398 | ||
1da177e4 LT |
7399 | /* |
7400 | * This routine is regularly called by all per-raid-array threads to | |
7401 | * deal with generic issues like resync and super-block update. | |
7402 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7403 | * need this as they never do any recovery or update the superblock. | |
7404 | * | |
7405 | * It does not do any resync itself, but rather "forks" off other threads | |
7406 | * to do that as needed. | |
7407 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7408 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7409 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7410 | * and wakeups up this thread which will reap the thread and finish up. |
7411 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7412 | * | |
7413 | * The overall approach is: | |
7414 | * 1/ if the superblock needs updating, update it. | |
7415 | * 2/ If a recovery thread is running, don't do anything else. | |
7416 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7417 | * 4/ If there are any faulty devices, remove them. | |
7418 | * 5/ If array is degraded, try to add spares devices | |
7419 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7420 | */ | |
fd01b88c | 7421 | void md_check_recovery(struct mddev *mddev) |
1da177e4 | 7422 | { |
68866e42 JB |
7423 | if (mddev->suspended) |
7424 | return; | |
7425 | ||
5f40402d | 7426 | if (mddev->bitmap) |
aa5cbd10 | 7427 | bitmap_daemon_work(mddev); |
1da177e4 | 7428 | |
fca4d848 | 7429 | if (signal_pending(current)) { |
31a59e34 | 7430 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7431 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7432 | mdname(mddev)); | |
7433 | mddev->safemode = 2; | |
7434 | } | |
7435 | flush_signals(current); | |
7436 | } | |
7437 | ||
c89a8eee N |
7438 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7439 | return; | |
1da177e4 | 7440 | if ( ! ( |
126925c0 | 7441 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7442 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7443 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7444 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7445 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7446 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7447 | )) |
7448 | return; | |
fca4d848 | 7449 | |
df5b89b3 | 7450 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7451 | int spares = 0; |
fca4d848 | 7452 | |
c89a8eee N |
7453 | if (mddev->ro) { |
7454 | /* Only thing we do on a ro array is remove | |
7455 | * failed devices. | |
7456 | */ | |
3cb03002 | 7457 | struct md_rdev *rdev; |
a8c42c7f N |
7458 | list_for_each_entry(rdev, &mddev->disks, same_set) |
7459 | if (rdev->raid_disk >= 0 && | |
7460 | !test_bit(Blocked, &rdev->flags) && | |
7461 | test_bit(Faulty, &rdev->flags) && | |
7462 | atomic_read(&rdev->nr_pending)==0) { | |
7463 | if (mddev->pers->hot_remove_disk( | |
7464 | mddev, rdev->raid_disk)==0) { | |
36fad858 | 7465 | sysfs_unlink_rdev(mddev, rdev); |
a8c42c7f N |
7466 | rdev->raid_disk = -1; |
7467 | } | |
7468 | } | |
c89a8eee N |
7469 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7470 | goto unlock; | |
7471 | } | |
7472 | ||
31a59e34 | 7473 | if (!mddev->external) { |
0fd62b86 | 7474 | int did_change = 0; |
31a59e34 N |
7475 | spin_lock_irq(&mddev->write_lock); |
7476 | if (mddev->safemode && | |
7477 | !atomic_read(&mddev->writes_pending) && | |
7478 | !mddev->in_sync && | |
7479 | mddev->recovery_cp == MaxSector) { | |
7480 | mddev->in_sync = 1; | |
0fd62b86 | 7481 | did_change = 1; |
070dc6dd | 7482 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7483 | } |
7484 | if (mddev->safemode == 1) | |
7485 | mddev->safemode = 0; | |
7486 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7487 | if (did_change) |
00bcb4ac | 7488 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7489 | } |
fca4d848 | 7490 | |
850b2b42 N |
7491 | if (mddev->flags) |
7492 | md_update_sb(mddev, 0); | |
06d91a5f | 7493 | |
1da177e4 LT |
7494 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7495 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7496 | /* resync/recovery still happening */ | |
7497 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7498 | goto unlock; | |
7499 | } | |
7500 | if (mddev->sync_thread) { | |
7ebc0be7 | 7501 | reap_sync_thread(mddev); |
1da177e4 LT |
7502 | goto unlock; |
7503 | } | |
72a23c21 NB |
7504 | /* Set RUNNING before clearing NEEDED to avoid |
7505 | * any transients in the value of "sync_action". | |
7506 | */ | |
7507 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7508 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7509 | /* Clear some bits that don't mean anything, but |
7510 | * might be left set | |
7511 | */ | |
24dd469d N |
7512 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7513 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7514 | |
5fd6c1dc N |
7515 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7516 | goto unlock; | |
1da177e4 LT |
7517 | /* no recovery is running. |
7518 | * remove any failed drives, then | |
7519 | * add spares if possible. | |
7520 | * Spare are also removed and re-added, to allow | |
7521 | * the personality to fail the re-add. | |
7522 | */ | |
1da177e4 | 7523 | |
b4c4c7b8 | 7524 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7525 | if (mddev->pers->check_reshape == NULL || |
7526 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7527 | /* Cannot proceed */ |
7528 | goto unlock; | |
7529 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7530 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7531 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7532 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7533 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7534 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7535 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7536 | } else if (mddev->recovery_cp < MaxSector) { |
7537 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7538 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7539 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7540 | /* nothing to be done ... */ | |
1da177e4 | 7541 | goto unlock; |
24dd469d | 7542 | |
1da177e4 | 7543 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7544 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7545 | /* We are adding a device or devices to an array | |
7546 | * which has the bitmap stored on all devices. | |
7547 | * So make sure all bitmap pages get written | |
7548 | */ | |
7549 | bitmap_write_all(mddev->bitmap); | |
7550 | } | |
1da177e4 LT |
7551 | mddev->sync_thread = md_register_thread(md_do_sync, |
7552 | mddev, | |
0da3c619 | 7553 | "resync"); |
1da177e4 LT |
7554 | if (!mddev->sync_thread) { |
7555 | printk(KERN_ERR "%s: could not start resync" | |
7556 | " thread...\n", | |
7557 | mdname(mddev)); | |
7558 | /* leave the spares where they are, it shouldn't hurt */ | |
7ebc0be7 N |
7559 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7560 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7561 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7562 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7563 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
d7603b7e | 7564 | } else |
1da177e4 | 7565 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7566 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7567 | md_new_event(mddev); |
1da177e4 LT |
7568 | } |
7569 | unlock: | |
72a23c21 NB |
7570 | if (!mddev->sync_thread) { |
7571 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7572 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7573 | &mddev->recovery)) | |
0c3573f1 | 7574 | if (mddev->sysfs_action) |
00bcb4ac | 7575 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7576 | } |
1da177e4 LT |
7577 | mddev_unlock(mddev); |
7578 | } | |
7579 | } | |
7580 | ||
fd01b88c | 7581 | void md_wait_for_blocked_rdev(struct md_rdev *rdev, struct mddev *mddev) |
6bfe0b49 | 7582 | { |
00bcb4ac | 7583 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 | 7584 | wait_event_timeout(rdev->blocked_wait, |
de393cde N |
7585 | !test_bit(Blocked, &rdev->flags) && |
7586 | !test_bit(BlockedBadBlocks, &rdev->flags), | |
6bfe0b49 DW |
7587 | msecs_to_jiffies(5000)); |
7588 | rdev_dec_pending(rdev, mddev); | |
7589 | } | |
7590 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7591 | ||
2230dfe4 N |
7592 | |
7593 | /* Bad block management. | |
7594 | * We can record which blocks on each device are 'bad' and so just | |
7595 | * fail those blocks, or that stripe, rather than the whole device. | |
7596 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7597 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7598 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7599 | * A 'shift' can be set so that larger blocks are tracked and | |
7600 | * consequently larger devices can be covered. | |
7601 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7602 | * | |
7603 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7604 | * might need to retry if it is very unlucky. | |
7605 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7606 | * so we use the write_seqlock_irq variant. | |
7607 | * | |
7608 | * When looking for a bad block we specify a range and want to | |
7609 | * know if any block in the range is bad. So we binary-search | |
7610 | * to the last range that starts at-or-before the given endpoint, | |
7611 | * (or "before the sector after the target range") | |
7612 | * then see if it ends after the given start. | |
7613 | * We return | |
7614 | * 0 if there are no known bad blocks in the range | |
7615 | * 1 if there are known bad block which are all acknowledged | |
7616 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
7617 | * plus the start/length of the first bad section we overlap. | |
7618 | */ | |
7619 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
7620 | sector_t *first_bad, int *bad_sectors) | |
7621 | { | |
7622 | int hi; | |
7623 | int lo = 0; | |
7624 | u64 *p = bb->page; | |
7625 | int rv = 0; | |
7626 | sector_t target = s + sectors; | |
7627 | unsigned seq; | |
7628 | ||
7629 | if (bb->shift > 0) { | |
7630 | /* round the start down, and the end up */ | |
7631 | s >>= bb->shift; | |
7632 | target += (1<<bb->shift) - 1; | |
7633 | target >>= bb->shift; | |
7634 | sectors = target - s; | |
7635 | } | |
7636 | /* 'target' is now the first block after the bad range */ | |
7637 | ||
7638 | retry: | |
7639 | seq = read_seqbegin(&bb->lock); | |
7640 | ||
7641 | hi = bb->count; | |
7642 | ||
7643 | /* Binary search between lo and hi for 'target' | |
7644 | * i.e. for the last range that starts before 'target' | |
7645 | */ | |
7646 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
7647 | * are known not to be the last range before target. | |
7648 | * VARIANT: hi-lo is the number of possible | |
7649 | * ranges, and decreases until it reaches 1 | |
7650 | */ | |
7651 | while (hi - lo > 1) { | |
7652 | int mid = (lo + hi) / 2; | |
7653 | sector_t a = BB_OFFSET(p[mid]); | |
7654 | if (a < target) | |
7655 | /* This could still be the one, earlier ranges | |
7656 | * could not. */ | |
7657 | lo = mid; | |
7658 | else | |
7659 | /* This and later ranges are definitely out. */ | |
7660 | hi = mid; | |
7661 | } | |
7662 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
7663 | if (hi > lo) { | |
7664 | /* need to check all range that end after 's' to see if | |
7665 | * any are unacknowledged. | |
7666 | */ | |
7667 | while (lo >= 0 && | |
7668 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7669 | if (BB_OFFSET(p[lo]) < target) { | |
7670 | /* starts before the end, and finishes after | |
7671 | * the start, so they must overlap | |
7672 | */ | |
7673 | if (rv != -1 && BB_ACK(p[lo])) | |
7674 | rv = 1; | |
7675 | else | |
7676 | rv = -1; | |
7677 | *first_bad = BB_OFFSET(p[lo]); | |
7678 | *bad_sectors = BB_LEN(p[lo]); | |
7679 | } | |
7680 | lo--; | |
7681 | } | |
7682 | } | |
7683 | ||
7684 | if (read_seqretry(&bb->lock, seq)) | |
7685 | goto retry; | |
7686 | ||
7687 | return rv; | |
7688 | } | |
7689 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
7690 | ||
7691 | /* | |
7692 | * Add a range of bad blocks to the table. | |
7693 | * This might extend the table, or might contract it | |
7694 | * if two adjacent ranges can be merged. | |
7695 | * We binary-search to find the 'insertion' point, then | |
7696 | * decide how best to handle it. | |
7697 | */ | |
7698 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
7699 | int acknowledged) | |
7700 | { | |
7701 | u64 *p; | |
7702 | int lo, hi; | |
7703 | int rv = 1; | |
7704 | ||
7705 | if (bb->shift < 0) | |
7706 | /* badblocks are disabled */ | |
7707 | return 0; | |
7708 | ||
7709 | if (bb->shift) { | |
7710 | /* round the start down, and the end up */ | |
7711 | sector_t next = s + sectors; | |
7712 | s >>= bb->shift; | |
7713 | next += (1<<bb->shift) - 1; | |
7714 | next >>= bb->shift; | |
7715 | sectors = next - s; | |
7716 | } | |
7717 | ||
7718 | write_seqlock_irq(&bb->lock); | |
7719 | ||
7720 | p = bb->page; | |
7721 | lo = 0; | |
7722 | hi = bb->count; | |
7723 | /* Find the last range that starts at-or-before 's' */ | |
7724 | while (hi - lo > 1) { | |
7725 | int mid = (lo + hi) / 2; | |
7726 | sector_t a = BB_OFFSET(p[mid]); | |
7727 | if (a <= s) | |
7728 | lo = mid; | |
7729 | else | |
7730 | hi = mid; | |
7731 | } | |
7732 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
7733 | hi = lo; | |
7734 | ||
7735 | if (hi > lo) { | |
7736 | /* we found a range that might merge with the start | |
7737 | * of our new range | |
7738 | */ | |
7739 | sector_t a = BB_OFFSET(p[lo]); | |
7740 | sector_t e = a + BB_LEN(p[lo]); | |
7741 | int ack = BB_ACK(p[lo]); | |
7742 | if (e >= s) { | |
7743 | /* Yes, we can merge with a previous range */ | |
7744 | if (s == a && s + sectors >= e) | |
7745 | /* new range covers old */ | |
7746 | ack = acknowledged; | |
7747 | else | |
7748 | ack = ack && acknowledged; | |
7749 | ||
7750 | if (e < s + sectors) | |
7751 | e = s + sectors; | |
7752 | if (e - a <= BB_MAX_LEN) { | |
7753 | p[lo] = BB_MAKE(a, e-a, ack); | |
7754 | s = e; | |
7755 | } else { | |
7756 | /* does not all fit in one range, | |
7757 | * make p[lo] maximal | |
7758 | */ | |
7759 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
7760 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
7761 | s = a + BB_MAX_LEN; | |
7762 | } | |
7763 | sectors = e - s; | |
7764 | } | |
7765 | } | |
7766 | if (sectors && hi < bb->count) { | |
7767 | /* 'hi' points to the first range that starts after 's'. | |
7768 | * Maybe we can merge with the start of that range */ | |
7769 | sector_t a = BB_OFFSET(p[hi]); | |
7770 | sector_t e = a + BB_LEN(p[hi]); | |
7771 | int ack = BB_ACK(p[hi]); | |
7772 | if (a <= s + sectors) { | |
7773 | /* merging is possible */ | |
7774 | if (e <= s + sectors) { | |
7775 | /* full overlap */ | |
7776 | e = s + sectors; | |
7777 | ack = acknowledged; | |
7778 | } else | |
7779 | ack = ack && acknowledged; | |
7780 | ||
7781 | a = s; | |
7782 | if (e - a <= BB_MAX_LEN) { | |
7783 | p[hi] = BB_MAKE(a, e-a, ack); | |
7784 | s = e; | |
7785 | } else { | |
7786 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
7787 | s = a + BB_MAX_LEN; | |
7788 | } | |
7789 | sectors = e - s; | |
7790 | lo = hi; | |
7791 | hi++; | |
7792 | } | |
7793 | } | |
7794 | if (sectors == 0 && hi < bb->count) { | |
7795 | /* we might be able to combine lo and hi */ | |
7796 | /* Note: 's' is at the end of 'lo' */ | |
7797 | sector_t a = BB_OFFSET(p[hi]); | |
7798 | int lolen = BB_LEN(p[lo]); | |
7799 | int hilen = BB_LEN(p[hi]); | |
7800 | int newlen = lolen + hilen - (s - a); | |
7801 | if (s >= a && newlen < BB_MAX_LEN) { | |
7802 | /* yes, we can combine them */ | |
7803 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
7804 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
7805 | memmove(p + hi, p + hi + 1, | |
7806 | (bb->count - hi - 1) * 8); | |
7807 | bb->count--; | |
7808 | } | |
7809 | } | |
7810 | while (sectors) { | |
7811 | /* didn't merge (it all). | |
7812 | * Need to add a range just before 'hi' */ | |
7813 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
7814 | /* No room for more */ | |
7815 | rv = 0; | |
7816 | break; | |
7817 | } else { | |
7818 | int this_sectors = sectors; | |
7819 | memmove(p + hi + 1, p + hi, | |
7820 | (bb->count - hi) * 8); | |
7821 | bb->count++; | |
7822 | ||
7823 | if (this_sectors > BB_MAX_LEN) | |
7824 | this_sectors = BB_MAX_LEN; | |
7825 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
7826 | sectors -= this_sectors; | |
7827 | s += this_sectors; | |
7828 | } | |
7829 | } | |
7830 | ||
7831 | bb->changed = 1; | |
de393cde N |
7832 | if (!acknowledged) |
7833 | bb->unacked_exist = 1; | |
2230dfe4 N |
7834 | write_sequnlock_irq(&bb->lock); |
7835 | ||
7836 | return rv; | |
7837 | } | |
7838 | ||
3cb03002 | 7839 | int rdev_set_badblocks(struct md_rdev *rdev, sector_t s, int sectors, |
2230dfe4 N |
7840 | int acknowledged) |
7841 | { | |
7842 | int rv = md_set_badblocks(&rdev->badblocks, | |
7843 | s + rdev->data_offset, sectors, acknowledged); | |
7844 | if (rv) { | |
7845 | /* Make sure they get written out promptly */ | |
7846 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); | |
7847 | md_wakeup_thread(rdev->mddev->thread); | |
7848 | } | |
7849 | return rv; | |
7850 | } | |
7851 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
7852 | ||
7853 | /* | |
7854 | * Remove a range of bad blocks from the table. | |
7855 | * This may involve extending the table if we spilt a region, | |
7856 | * but it must not fail. So if the table becomes full, we just | |
7857 | * drop the remove request. | |
7858 | */ | |
7859 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
7860 | { | |
7861 | u64 *p; | |
7862 | int lo, hi; | |
7863 | sector_t target = s + sectors; | |
7864 | int rv = 0; | |
7865 | ||
7866 | if (bb->shift > 0) { | |
7867 | /* When clearing we round the start up and the end down. | |
7868 | * This should not matter as the shift should align with | |
7869 | * the block size and no rounding should ever be needed. | |
7870 | * However it is better the think a block is bad when it | |
7871 | * isn't than to think a block is not bad when it is. | |
7872 | */ | |
7873 | s += (1<<bb->shift) - 1; | |
7874 | s >>= bb->shift; | |
7875 | target >>= bb->shift; | |
7876 | sectors = target - s; | |
7877 | } | |
7878 | ||
7879 | write_seqlock_irq(&bb->lock); | |
7880 | ||
7881 | p = bb->page; | |
7882 | lo = 0; | |
7883 | hi = bb->count; | |
7884 | /* Find the last range that starts before 'target' */ | |
7885 | while (hi - lo > 1) { | |
7886 | int mid = (lo + hi) / 2; | |
7887 | sector_t a = BB_OFFSET(p[mid]); | |
7888 | if (a < target) | |
7889 | lo = mid; | |
7890 | else | |
7891 | hi = mid; | |
7892 | } | |
7893 | if (hi > lo) { | |
7894 | /* p[lo] is the last range that could overlap the | |
7895 | * current range. Earlier ranges could also overlap, | |
7896 | * but only this one can overlap the end of the range. | |
7897 | */ | |
7898 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
7899 | /* Partial overlap, leave the tail of this range */ | |
7900 | int ack = BB_ACK(p[lo]); | |
7901 | sector_t a = BB_OFFSET(p[lo]); | |
7902 | sector_t end = a + BB_LEN(p[lo]); | |
7903 | ||
7904 | if (a < s) { | |
7905 | /* we need to split this range */ | |
7906 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
7907 | rv = 0; | |
7908 | goto out; | |
7909 | } | |
7910 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
7911 | bb->count++; | |
7912 | p[lo] = BB_MAKE(a, s-a, ack); | |
7913 | lo++; | |
7914 | } | |
7915 | p[lo] = BB_MAKE(target, end - target, ack); | |
7916 | /* there is no longer an overlap */ | |
7917 | hi = lo; | |
7918 | lo--; | |
7919 | } | |
7920 | while (lo >= 0 && | |
7921 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7922 | /* This range does overlap */ | |
7923 | if (BB_OFFSET(p[lo]) < s) { | |
7924 | /* Keep the early parts of this range. */ | |
7925 | int ack = BB_ACK(p[lo]); | |
7926 | sector_t start = BB_OFFSET(p[lo]); | |
7927 | p[lo] = BB_MAKE(start, s - start, ack); | |
7928 | /* now low doesn't overlap, so.. */ | |
7929 | break; | |
7930 | } | |
7931 | lo--; | |
7932 | } | |
7933 | /* 'lo' is strictly before, 'hi' is strictly after, | |
7934 | * anything between needs to be discarded | |
7935 | */ | |
7936 | if (hi - lo > 1) { | |
7937 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
7938 | bb->count -= (hi - lo - 1); | |
7939 | } | |
7940 | } | |
7941 | ||
7942 | bb->changed = 1; | |
7943 | out: | |
7944 | write_sequnlock_irq(&bb->lock); | |
7945 | return rv; | |
7946 | } | |
7947 | ||
3cb03002 | 7948 | int rdev_clear_badblocks(struct md_rdev *rdev, sector_t s, int sectors) |
2230dfe4 N |
7949 | { |
7950 | return md_clear_badblocks(&rdev->badblocks, | |
7951 | s + rdev->data_offset, | |
7952 | sectors); | |
7953 | } | |
7954 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
7955 | ||
7956 | /* | |
7957 | * Acknowledge all bad blocks in a list. | |
7958 | * This only succeeds if ->changed is clear. It is used by | |
7959 | * in-kernel metadata updates | |
7960 | */ | |
7961 | void md_ack_all_badblocks(struct badblocks *bb) | |
7962 | { | |
7963 | if (bb->page == NULL || bb->changed) | |
7964 | /* no point even trying */ | |
7965 | return; | |
7966 | write_seqlock_irq(&bb->lock); | |
7967 | ||
7968 | if (bb->changed == 0) { | |
7969 | u64 *p = bb->page; | |
7970 | int i; | |
7971 | for (i = 0; i < bb->count ; i++) { | |
7972 | if (!BB_ACK(p[i])) { | |
7973 | sector_t start = BB_OFFSET(p[i]); | |
7974 | int len = BB_LEN(p[i]); | |
7975 | p[i] = BB_MAKE(start, len, 1); | |
7976 | } | |
7977 | } | |
de393cde | 7978 | bb->unacked_exist = 0; |
2230dfe4 N |
7979 | } |
7980 | write_sequnlock_irq(&bb->lock); | |
7981 | } | |
7982 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
7983 | ||
16c791a5 N |
7984 | /* sysfs access to bad-blocks list. |
7985 | * We present two files. | |
7986 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
7987 | * are recorded as bad. The list is truncated to fit within | |
7988 | * the one-page limit of sysfs. | |
7989 | * Writing "sector length" to this file adds an acknowledged | |
7990 | * bad block list. | |
7991 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
7992 | * been acknowledged. Writing to this file adds bad blocks | |
7993 | * without acknowledging them. This is largely for testing. | |
7994 | */ | |
7995 | ||
7996 | static ssize_t | |
7997 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
7998 | { | |
7999 | size_t len; | |
8000 | int i; | |
8001 | u64 *p = bb->page; | |
8002 | unsigned seq; | |
8003 | ||
8004 | if (bb->shift < 0) | |
8005 | return 0; | |
8006 | ||
8007 | retry: | |
8008 | seq = read_seqbegin(&bb->lock); | |
8009 | ||
8010 | len = 0; | |
8011 | i = 0; | |
8012 | ||
8013 | while (len < PAGE_SIZE && i < bb->count) { | |
8014 | sector_t s = BB_OFFSET(p[i]); | |
8015 | unsigned int length = BB_LEN(p[i]); | |
8016 | int ack = BB_ACK(p[i]); | |
8017 | i++; | |
8018 | ||
8019 | if (unack && ack) | |
8020 | continue; | |
8021 | ||
8022 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
8023 | (unsigned long long)s << bb->shift, | |
8024 | length << bb->shift); | |
8025 | } | |
de393cde N |
8026 | if (unack && len == 0) |
8027 | bb->unacked_exist = 0; | |
16c791a5 N |
8028 | |
8029 | if (read_seqretry(&bb->lock, seq)) | |
8030 | goto retry; | |
8031 | ||
8032 | return len; | |
8033 | } | |
8034 | ||
8035 | #define DO_DEBUG 1 | |
8036 | ||
8037 | static ssize_t | |
8038 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
8039 | { | |
8040 | unsigned long long sector; | |
8041 | int length; | |
8042 | char newline; | |
8043 | #ifdef DO_DEBUG | |
8044 | /* Allow clearing via sysfs *only* for testing/debugging. | |
8045 | * Normally only a successful write may clear a badblock | |
8046 | */ | |
8047 | int clear = 0; | |
8048 | if (page[0] == '-') { | |
8049 | clear = 1; | |
8050 | page++; | |
8051 | } | |
8052 | #endif /* DO_DEBUG */ | |
8053 | ||
8054 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8055 | case 3: | |
8056 | if (newline != '\n') | |
8057 | return -EINVAL; | |
8058 | case 2: | |
8059 | if (length <= 0) | |
8060 | return -EINVAL; | |
8061 | break; | |
8062 | default: | |
8063 | return -EINVAL; | |
8064 | } | |
8065 | ||
8066 | #ifdef DO_DEBUG | |
8067 | if (clear) { | |
8068 | md_clear_badblocks(bb, sector, length); | |
8069 | return len; | |
8070 | } | |
8071 | #endif /* DO_DEBUG */ | |
8072 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8073 | return len; | |
8074 | else | |
8075 | return -ENOSPC; | |
8076 | } | |
8077 | ||
75c96f85 AB |
8078 | static int md_notify_reboot(struct notifier_block *this, |
8079 | unsigned long code, void *x) | |
1da177e4 LT |
8080 | { |
8081 | struct list_head *tmp; | |
fd01b88c | 8082 | struct mddev *mddev; |
2dba6a91 | 8083 | int need_delay = 0; |
1da177e4 LT |
8084 | |
8085 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
8086 | ||
8087 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
8088 | ||
2dba6a91 | 8089 | for_each_mddev(mddev, tmp) { |
c71d4887 | 8090 | if (mddev_trylock(mddev)) { |
2b25000b N |
8091 | /* Force a switch to readonly even array |
8092 | * appears to still be in use. Hence | |
8093 | * the '100'. | |
8094 | */ | |
a4bd82d0 | 8095 | md_set_readonly(mddev, 100); |
c71d4887 NB |
8096 | mddev_unlock(mddev); |
8097 | } | |
2dba6a91 DB |
8098 | need_delay = 1; |
8099 | } | |
1da177e4 LT |
8100 | /* |
8101 | * certain more exotic SCSI devices are known to be | |
8102 | * volatile wrt too early system reboots. While the | |
8103 | * right place to handle this issue is the given | |
8104 | * driver, we do want to have a safe RAID driver ... | |
8105 | */ | |
2dba6a91 DB |
8106 | if (need_delay) |
8107 | mdelay(1000*1); | |
1da177e4 LT |
8108 | } |
8109 | return NOTIFY_DONE; | |
8110 | } | |
8111 | ||
75c96f85 | 8112 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8113 | .notifier_call = md_notify_reboot, |
8114 | .next = NULL, | |
8115 | .priority = INT_MAX, /* before any real devices */ | |
8116 | }; | |
8117 | ||
8118 | static void md_geninit(void) | |
8119 | { | |
36a4e1fe | 8120 | pr_debug("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
1da177e4 | 8121 | |
c7705f34 | 8122 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8123 | } |
8124 | ||
75c96f85 | 8125 | static int __init md_init(void) |
1da177e4 | 8126 | { |
e804ac78 TH |
8127 | int ret = -ENOMEM; |
8128 | ||
ada609ee | 8129 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8130 | if (!md_wq) |
8131 | goto err_wq; | |
8132 | ||
8133 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8134 | if (!md_misc_wq) | |
8135 | goto err_misc_wq; | |
8136 | ||
8137 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8138 | goto err_md; | |
8139 | ||
8140 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8141 | goto err_mdp; | |
8142 | mdp_major = ret; | |
8143 | ||
3dbd8c2e | 8144 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
8145 | md_probe, NULL, NULL); |
8146 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8147 | md_probe, NULL, NULL); |
8148 | ||
1da177e4 | 8149 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8150 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8151 | |
8152 | md_geninit(); | |
d710e138 | 8153 | return 0; |
1da177e4 | 8154 | |
e804ac78 TH |
8155 | err_mdp: |
8156 | unregister_blkdev(MD_MAJOR, "md"); | |
8157 | err_md: | |
8158 | destroy_workqueue(md_misc_wq); | |
8159 | err_misc_wq: | |
8160 | destroy_workqueue(md_wq); | |
8161 | err_wq: | |
8162 | return ret; | |
8163 | } | |
1da177e4 LT |
8164 | |
8165 | #ifndef MODULE | |
8166 | ||
8167 | /* | |
8168 | * Searches all registered partitions for autorun RAID arrays | |
8169 | * at boot time. | |
8170 | */ | |
4d936ec1 ME |
8171 | |
8172 | static LIST_HEAD(all_detected_devices); | |
8173 | struct detected_devices_node { | |
8174 | struct list_head list; | |
8175 | dev_t dev; | |
8176 | }; | |
1da177e4 LT |
8177 | |
8178 | void md_autodetect_dev(dev_t dev) | |
8179 | { | |
4d936ec1 ME |
8180 | struct detected_devices_node *node_detected_dev; |
8181 | ||
8182 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8183 | if (node_detected_dev) { | |
8184 | node_detected_dev->dev = dev; | |
8185 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8186 | } else { | |
8187 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8188 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8189 | } | |
1da177e4 LT |
8190 | } |
8191 | ||
8192 | ||
8193 | static void autostart_arrays(int part) | |
8194 | { | |
3cb03002 | 8195 | struct md_rdev *rdev; |
4d936ec1 ME |
8196 | struct detected_devices_node *node_detected_dev; |
8197 | dev_t dev; | |
8198 | int i_scanned, i_passed; | |
1da177e4 | 8199 | |
4d936ec1 ME |
8200 | i_scanned = 0; |
8201 | i_passed = 0; | |
1da177e4 | 8202 | |
4d936ec1 | 8203 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8204 | |
4d936ec1 ME |
8205 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8206 | i_scanned++; | |
8207 | node_detected_dev = list_entry(all_detected_devices.next, | |
8208 | struct detected_devices_node, list); | |
8209 | list_del(&node_detected_dev->list); | |
8210 | dev = node_detected_dev->dev; | |
8211 | kfree(node_detected_dev); | |
df968c4e | 8212 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8213 | if (IS_ERR(rdev)) |
8214 | continue; | |
8215 | ||
b2d444d7 | 8216 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
8217 | MD_BUG(); |
8218 | continue; | |
8219 | } | |
d0fae18f | 8220 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8221 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8222 | i_passed++; |
1da177e4 | 8223 | } |
4d936ec1 ME |
8224 | |
8225 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8226 | i_scanned, i_passed); | |
1da177e4 LT |
8227 | |
8228 | autorun_devices(part); | |
8229 | } | |
8230 | ||
fdee8ae4 | 8231 | #endif /* !MODULE */ |
1da177e4 LT |
8232 | |
8233 | static __exit void md_exit(void) | |
8234 | { | |
fd01b88c | 8235 | struct mddev *mddev; |
1da177e4 | 8236 | struct list_head *tmp; |
8ab5e4c1 | 8237 | |
3dbd8c2e | 8238 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 8239 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8240 | |
3dbd8c2e | 8241 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8242 | unregister_blkdev(mdp_major, "mdp"); |
8243 | unregister_reboot_notifier(&md_notifier); | |
8244 | unregister_sysctl_table(raid_table_header); | |
8245 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 8246 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8247 | export_array(mddev); |
d3374825 | 8248 | mddev->hold_active = 0; |
1da177e4 | 8249 | } |
e804ac78 TH |
8250 | destroy_workqueue(md_misc_wq); |
8251 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8252 | } |
8253 | ||
685784aa | 8254 | subsys_initcall(md_init); |
1da177e4 LT |
8255 | module_exit(md_exit) |
8256 | ||
f91de92e N |
8257 | static int get_ro(char *buffer, struct kernel_param *kp) |
8258 | { | |
8259 | return sprintf(buffer, "%d", start_readonly); | |
8260 | } | |
8261 | static int set_ro(const char *val, struct kernel_param *kp) | |
8262 | { | |
8263 | char *e; | |
8264 | int num = simple_strtoul(val, &e, 10); | |
8265 | if (*val && (*e == '\0' || *e == '\n')) { | |
8266 | start_readonly = num; | |
4dbcdc75 | 8267 | return 0; |
f91de92e N |
8268 | } |
8269 | return -EINVAL; | |
8270 | } | |
8271 | ||
80ca3a44 N |
8272 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8273 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 8274 | |
efeb53c0 | 8275 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8276 | |
1da177e4 LT |
8277 | EXPORT_SYMBOL(register_md_personality); |
8278 | EXPORT_SYMBOL(unregister_md_personality); | |
8279 | EXPORT_SYMBOL(md_error); | |
8280 | EXPORT_SYMBOL(md_done_sync); | |
8281 | EXPORT_SYMBOL(md_write_start); | |
8282 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
8283 | EXPORT_SYMBOL(md_register_thread); |
8284 | EXPORT_SYMBOL(md_unregister_thread); | |
8285 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
8286 | EXPORT_SYMBOL(md_check_recovery); |
8287 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8288 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8289 | MODULE_ALIAS("md"); |
72008652 | 8290 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |