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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 LT |
56 | |
57 | #define DEBUG 0 | |
58 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
59 | ||
1da177e4 | 60 | #ifndef MODULE |
d710e138 | 61 | static void autostart_arrays(int part); |
1da177e4 LT |
62 | #endif |
63 | ||
2604b703 | 64 | static LIST_HEAD(pers_list); |
1da177e4 LT |
65 | static DEFINE_SPINLOCK(pers_lock); |
66 | ||
5e56341d AB |
67 | static void md_print_devices(void); |
68 | ||
90b08710 | 69 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
e804ac78 TH |
70 | static struct workqueue_struct *md_wq; |
71 | static struct workqueue_struct *md_misc_wq; | |
90b08710 | 72 | |
5e56341d AB |
73 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
74 | ||
1e50915f RB |
75 | /* |
76 | * Default number of read corrections we'll attempt on an rdev | |
77 | * before ejecting it from the array. We divide the read error | |
78 | * count by 2 for every hour elapsed between read errors. | |
79 | */ | |
80 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
81 | /* |
82 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
83 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
84 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 85 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
86 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
87 | * speed limit - in case reconstruction slows down your system despite | |
88 | * idle IO detection. | |
89 | * | |
90 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 91 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
92 | */ |
93 | ||
94 | static int sysctl_speed_limit_min = 1000; | |
95 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
96 | static inline int speed_min(mddev_t *mddev) |
97 | { | |
98 | return mddev->sync_speed_min ? | |
99 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
100 | } | |
101 | ||
102 | static inline int speed_max(mddev_t *mddev) | |
103 | { | |
104 | return mddev->sync_speed_max ? | |
105 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
106 | } | |
1da177e4 LT |
107 | |
108 | static struct ctl_table_header *raid_table_header; | |
109 | ||
110 | static ctl_table raid_table[] = { | |
111 | { | |
1da177e4 LT |
112 | .procname = "speed_limit_min", |
113 | .data = &sysctl_speed_limit_min, | |
114 | .maxlen = sizeof(int), | |
80ca3a44 | 115 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 116 | .proc_handler = proc_dointvec, |
1da177e4 LT |
117 | }, |
118 | { | |
1da177e4 LT |
119 | .procname = "speed_limit_max", |
120 | .data = &sysctl_speed_limit_max, | |
121 | .maxlen = sizeof(int), | |
80ca3a44 | 122 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 123 | .proc_handler = proc_dointvec, |
1da177e4 | 124 | }, |
894d2491 | 125 | { } |
1da177e4 LT |
126 | }; |
127 | ||
128 | static ctl_table raid_dir_table[] = { | |
129 | { | |
1da177e4 LT |
130 | .procname = "raid", |
131 | .maxlen = 0, | |
80ca3a44 | 132 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
133 | .child = raid_table, |
134 | }, | |
894d2491 | 135 | { } |
1da177e4 LT |
136 | }; |
137 | ||
138 | static ctl_table raid_root_table[] = { | |
139 | { | |
1da177e4 LT |
140 | .procname = "dev", |
141 | .maxlen = 0, | |
142 | .mode = 0555, | |
143 | .child = raid_dir_table, | |
144 | }, | |
894d2491 | 145 | { } |
1da177e4 LT |
146 | }; |
147 | ||
83d5cde4 | 148 | static const struct block_device_operations md_fops; |
1da177e4 | 149 | |
f91de92e N |
150 | static int start_readonly; |
151 | ||
a167f663 N |
152 | /* bio_clone_mddev |
153 | * like bio_clone, but with a local bio set | |
154 | */ | |
155 | ||
156 | static void mddev_bio_destructor(struct bio *bio) | |
157 | { | |
158 | mddev_t *mddev, **mddevp; | |
159 | ||
160 | mddevp = (void*)bio; | |
161 | mddev = mddevp[-1]; | |
162 | ||
163 | bio_free(bio, mddev->bio_set); | |
164 | } | |
165 | ||
166 | struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs, | |
167 | mddev_t *mddev) | |
168 | { | |
169 | struct bio *b; | |
170 | mddev_t **mddevp; | |
171 | ||
172 | if (!mddev || !mddev->bio_set) | |
173 | return bio_alloc(gfp_mask, nr_iovecs); | |
174 | ||
175 | b = bio_alloc_bioset(gfp_mask, nr_iovecs, | |
176 | mddev->bio_set); | |
177 | if (!b) | |
178 | return NULL; | |
179 | mddevp = (void*)b; | |
180 | mddevp[-1] = mddev; | |
181 | b->bi_destructor = mddev_bio_destructor; | |
182 | return b; | |
183 | } | |
184 | EXPORT_SYMBOL_GPL(bio_alloc_mddev); | |
185 | ||
186 | struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask, | |
187 | mddev_t *mddev) | |
188 | { | |
189 | struct bio *b; | |
190 | mddev_t **mddevp; | |
191 | ||
192 | if (!mddev || !mddev->bio_set) | |
193 | return bio_clone(bio, gfp_mask); | |
194 | ||
195 | b = bio_alloc_bioset(gfp_mask, bio->bi_max_vecs, | |
196 | mddev->bio_set); | |
197 | if (!b) | |
198 | return NULL; | |
199 | mddevp = (void*)b; | |
200 | mddevp[-1] = mddev; | |
201 | b->bi_destructor = mddev_bio_destructor; | |
202 | __bio_clone(b, bio); | |
203 | if (bio_integrity(bio)) { | |
204 | int ret; | |
205 | ||
206 | ret = bio_integrity_clone(b, bio, gfp_mask, mddev->bio_set); | |
207 | ||
208 | if (ret < 0) { | |
209 | bio_put(b); | |
210 | return NULL; | |
211 | } | |
212 | } | |
213 | ||
214 | return b; | |
215 | } | |
216 | EXPORT_SYMBOL_GPL(bio_clone_mddev); | |
217 | ||
d2eb35ac N |
218 | void md_trim_bio(struct bio *bio, int offset, int size) |
219 | { | |
220 | /* 'bio' is a cloned bio which we need to trim to match | |
221 | * the given offset and size. | |
222 | * This requires adjusting bi_sector, bi_size, and bi_io_vec | |
223 | */ | |
224 | int i; | |
225 | struct bio_vec *bvec; | |
226 | int sofar = 0; | |
227 | ||
228 | size <<= 9; | |
229 | if (offset == 0 && size == bio->bi_size) | |
230 | return; | |
231 | ||
232 | bio->bi_sector += offset; | |
233 | bio->bi_size = size; | |
234 | offset <<= 9; | |
235 | clear_bit(BIO_SEG_VALID, &bio->bi_flags); | |
236 | ||
237 | while (bio->bi_idx < bio->bi_vcnt && | |
238 | bio->bi_io_vec[bio->bi_idx].bv_len <= offset) { | |
239 | /* remove this whole bio_vec */ | |
240 | offset -= bio->bi_io_vec[bio->bi_idx].bv_len; | |
241 | bio->bi_idx++; | |
242 | } | |
243 | if (bio->bi_idx < bio->bi_vcnt) { | |
244 | bio->bi_io_vec[bio->bi_idx].bv_offset += offset; | |
245 | bio->bi_io_vec[bio->bi_idx].bv_len -= offset; | |
246 | } | |
247 | /* avoid any complications with bi_idx being non-zero*/ | |
248 | if (bio->bi_idx) { | |
249 | memmove(bio->bi_io_vec, bio->bi_io_vec+bio->bi_idx, | |
250 | (bio->bi_vcnt - bio->bi_idx) * sizeof(struct bio_vec)); | |
251 | bio->bi_vcnt -= bio->bi_idx; | |
252 | bio->bi_idx = 0; | |
253 | } | |
254 | /* Make sure vcnt and last bv are not too big */ | |
255 | bio_for_each_segment(bvec, bio, i) { | |
256 | if (sofar + bvec->bv_len > size) | |
257 | bvec->bv_len = size - sofar; | |
258 | if (bvec->bv_len == 0) { | |
259 | bio->bi_vcnt = i; | |
260 | break; | |
261 | } | |
262 | sofar += bvec->bv_len; | |
263 | } | |
264 | } | |
265 | EXPORT_SYMBOL_GPL(md_trim_bio); | |
266 | ||
d7603b7e N |
267 | /* |
268 | * We have a system wide 'event count' that is incremented | |
269 | * on any 'interesting' event, and readers of /proc/mdstat | |
270 | * can use 'poll' or 'select' to find out when the event | |
271 | * count increases. | |
272 | * | |
273 | * Events are: | |
274 | * start array, stop array, error, add device, remove device, | |
275 | * start build, activate spare | |
276 | */ | |
2989ddbd | 277 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 278 | static atomic_t md_event_count; |
29269553 | 279 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
280 | { |
281 | atomic_inc(&md_event_count); | |
282 | wake_up(&md_event_waiters); | |
283 | } | |
29269553 | 284 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 285 | |
c331eb04 N |
286 | /* Alternate version that can be called from interrupts |
287 | * when calling sysfs_notify isn't needed. | |
288 | */ | |
05381954 | 289 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
290 | { |
291 | atomic_inc(&md_event_count); | |
292 | wake_up(&md_event_waiters); | |
293 | } | |
294 | ||
1da177e4 LT |
295 | /* |
296 | * Enables to iterate over all existing md arrays | |
297 | * all_mddevs_lock protects this list. | |
298 | */ | |
299 | static LIST_HEAD(all_mddevs); | |
300 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
301 | ||
302 | ||
303 | /* | |
304 | * iterates through all used mddevs in the system. | |
305 | * We take care to grab the all_mddevs_lock whenever navigating | |
306 | * the list, and to always hold a refcount when unlocked. | |
307 | * Any code which breaks out of this loop while own | |
308 | * a reference to the current mddev and must mddev_put it. | |
309 | */ | |
29ac4aa3 | 310 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
311 | \ |
312 | for (({ spin_lock(&all_mddevs_lock); \ | |
313 | tmp = all_mddevs.next; \ | |
314 | mddev = NULL;}); \ | |
315 | ({ if (tmp != &all_mddevs) \ | |
316 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
317 | spin_unlock(&all_mddevs_lock); \ | |
318 | if (mddev) mddev_put(mddev); \ | |
319 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
320 | tmp != &all_mddevs;}); \ | |
321 | ({ spin_lock(&all_mddevs_lock); \ | |
322 | tmp = tmp->next;}) \ | |
323 | ) | |
324 | ||
325 | ||
409c57f3 N |
326 | /* Rather than calling directly into the personality make_request function, |
327 | * IO requests come here first so that we can check if the device is | |
328 | * being suspended pending a reconfiguration. | |
329 | * We hold a refcount over the call to ->make_request. By the time that | |
330 | * call has finished, the bio has been linked into some internal structure | |
331 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
332 | */ | |
333 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 334 | { |
49077326 | 335 | const int rw = bio_data_dir(bio); |
409c57f3 N |
336 | mddev_t *mddev = q->queuedata; |
337 | int rv; | |
49077326 | 338 | int cpu; |
e91ece55 | 339 | unsigned int sectors; |
49077326 | 340 | |
0ca69886 N |
341 | if (mddev == NULL || mddev->pers == NULL |
342 | || !mddev->ready) { | |
409c57f3 N |
343 | bio_io_error(bio); |
344 | return 0; | |
345 | } | |
0ca69886 | 346 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 347 | rcu_read_lock(); |
e9c7469b | 348 | if (mddev->suspended) { |
409c57f3 N |
349 | DEFINE_WAIT(__wait); |
350 | for (;;) { | |
351 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
352 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 353 | if (!mddev->suspended) |
409c57f3 N |
354 | break; |
355 | rcu_read_unlock(); | |
356 | schedule(); | |
357 | rcu_read_lock(); | |
358 | } | |
359 | finish_wait(&mddev->sb_wait, &__wait); | |
360 | } | |
361 | atomic_inc(&mddev->active_io); | |
362 | rcu_read_unlock(); | |
49077326 | 363 | |
e91ece55 CM |
364 | /* |
365 | * save the sectors now since our bio can | |
366 | * go away inside make_request | |
367 | */ | |
368 | sectors = bio_sectors(bio); | |
21a52c6d | 369 | rv = mddev->pers->make_request(mddev, bio); |
49077326 N |
370 | |
371 | cpu = part_stat_lock(); | |
372 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
e91ece55 | 373 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); |
49077326 N |
374 | part_stat_unlock(); |
375 | ||
409c57f3 N |
376 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
377 | wake_up(&mddev->sb_wait); | |
378 | ||
379 | return rv; | |
380 | } | |
381 | ||
9e35b99c N |
382 | /* mddev_suspend makes sure no new requests are submitted |
383 | * to the device, and that any requests that have been submitted | |
384 | * are completely handled. | |
385 | * Once ->stop is called and completes, the module will be completely | |
386 | * unused. | |
387 | */ | |
390ee602 | 388 | void mddev_suspend(mddev_t *mddev) |
409c57f3 N |
389 | { |
390 | BUG_ON(mddev->suspended); | |
391 | mddev->suspended = 1; | |
392 | synchronize_rcu(); | |
393 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
394 | mddev->pers->quiesce(mddev, 1); | |
409c57f3 | 395 | } |
390ee602 | 396 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 397 | |
390ee602 | 398 | void mddev_resume(mddev_t *mddev) |
409c57f3 N |
399 | { |
400 | mddev->suspended = 0; | |
401 | wake_up(&mddev->sb_wait); | |
402 | mddev->pers->quiesce(mddev, 0); | |
0fd018af JB |
403 | |
404 | md_wakeup_thread(mddev->thread); | |
405 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 406 | } |
390ee602 | 407 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 408 | |
3fa841d7 N |
409 | int mddev_congested(mddev_t *mddev, int bits) |
410 | { | |
411 | return mddev->suspended; | |
412 | } | |
413 | EXPORT_SYMBOL(mddev_congested); | |
414 | ||
a2826aa9 | 415 | /* |
e9c7469b | 416 | * Generic flush handling for md |
a2826aa9 N |
417 | */ |
418 | ||
e9c7469b | 419 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 N |
420 | { |
421 | mdk_rdev_t *rdev = bio->bi_private; | |
422 | mddev_t *mddev = rdev->mddev; | |
a2826aa9 N |
423 | |
424 | rdev_dec_pending(rdev, mddev); | |
425 | ||
426 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 427 | /* The pre-request flush has finished */ |
e804ac78 | 428 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
429 | } |
430 | bio_put(bio); | |
431 | } | |
432 | ||
a7a07e69 N |
433 | static void md_submit_flush_data(struct work_struct *ws); |
434 | ||
a035fc3e | 435 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 436 | { |
a035fc3e | 437 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
a2826aa9 N |
438 | mdk_rdev_t *rdev; |
439 | ||
a7a07e69 N |
440 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
441 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 N |
442 | rcu_read_lock(); |
443 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
444 | if (rdev->raid_disk >= 0 && | |
445 | !test_bit(Faulty, &rdev->flags)) { | |
446 | /* Take two references, one is dropped | |
447 | * when request finishes, one after | |
448 | * we reclaim rcu_read_lock | |
449 | */ | |
450 | struct bio *bi; | |
451 | atomic_inc(&rdev->nr_pending); | |
452 | atomic_inc(&rdev->nr_pending); | |
453 | rcu_read_unlock(); | |
a167f663 | 454 | bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev); |
e9c7469b | 455 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
456 | bi->bi_private = rdev; |
457 | bi->bi_bdev = rdev->bdev; | |
458 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 459 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
460 | rcu_read_lock(); |
461 | rdev_dec_pending(rdev, mddev); | |
462 | } | |
463 | rcu_read_unlock(); | |
a7a07e69 N |
464 | if (atomic_dec_and_test(&mddev->flush_pending)) |
465 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
466 | } |
467 | ||
e9c7469b | 468 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 469 | { |
e9c7469b TH |
470 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
471 | struct bio *bio = mddev->flush_bio; | |
a2826aa9 | 472 | |
e9c7469b | 473 | if (bio->bi_size == 0) |
a2826aa9 N |
474 | /* an empty barrier - all done */ |
475 | bio_endio(bio, 0); | |
476 | else { | |
e9c7469b | 477 | bio->bi_rw &= ~REQ_FLUSH; |
21a52c6d | 478 | if (mddev->pers->make_request(mddev, bio)) |
a2826aa9 | 479 | generic_make_request(bio); |
a2826aa9 | 480 | } |
2b74e12e N |
481 | |
482 | mddev->flush_bio = NULL; | |
483 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
484 | } |
485 | ||
e9c7469b | 486 | void md_flush_request(mddev_t *mddev, struct bio *bio) |
a2826aa9 N |
487 | { |
488 | spin_lock_irq(&mddev->write_lock); | |
489 | wait_event_lock_irq(mddev->sb_wait, | |
e9c7469b | 490 | !mddev->flush_bio, |
a2826aa9 | 491 | mddev->write_lock, /*nothing*/); |
e9c7469b | 492 | mddev->flush_bio = bio; |
a2826aa9 N |
493 | spin_unlock_irq(&mddev->write_lock); |
494 | ||
a035fc3e N |
495 | INIT_WORK(&mddev->flush_work, submit_flushes); |
496 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 497 | } |
e9c7469b | 498 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 499 | |
97658cdd N |
500 | /* Support for plugging. |
501 | * This mirrors the plugging support in request_queue, but does not | |
502 | * require having a whole queue or request structures. | |
503 | * We allocate an md_plug_cb for each md device and each thread it gets | |
504 | * plugged on. This links tot the private plug_handle structure in the | |
505 | * personality data where we keep a count of the number of outstanding | |
506 | * plugs so other code can see if a plug is active. | |
507 | */ | |
508 | struct md_plug_cb { | |
509 | struct blk_plug_cb cb; | |
510 | mddev_t *mddev; | |
511 | }; | |
512 | ||
513 | static void plugger_unplug(struct blk_plug_cb *cb) | |
514 | { | |
515 | struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb); | |
516 | if (atomic_dec_and_test(&mdcb->mddev->plug_cnt)) | |
517 | md_wakeup_thread(mdcb->mddev->thread); | |
518 | kfree(mdcb); | |
519 | } | |
520 | ||
521 | /* Check that an unplug wakeup will come shortly. | |
522 | * If not, wakeup the md thread immediately | |
523 | */ | |
524 | int mddev_check_plugged(mddev_t *mddev) | |
525 | { | |
526 | struct blk_plug *plug = current->plug; | |
527 | struct md_plug_cb *mdcb; | |
528 | ||
529 | if (!plug) | |
530 | return 0; | |
531 | ||
532 | list_for_each_entry(mdcb, &plug->cb_list, cb.list) { | |
533 | if (mdcb->cb.callback == plugger_unplug && | |
534 | mdcb->mddev == mddev) { | |
535 | /* Already on the list, move to top */ | |
536 | if (mdcb != list_first_entry(&plug->cb_list, | |
537 | struct md_plug_cb, | |
538 | cb.list)) | |
539 | list_move(&mdcb->cb.list, &plug->cb_list); | |
540 | return 1; | |
541 | } | |
542 | } | |
543 | /* Not currently on the callback list */ | |
544 | mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC); | |
545 | if (!mdcb) | |
546 | return 0; | |
547 | ||
548 | mdcb->mddev = mddev; | |
549 | mdcb->cb.callback = plugger_unplug; | |
550 | atomic_inc(&mddev->plug_cnt); | |
551 | list_add(&mdcb->cb.list, &plug->cb_list); | |
552 | return 1; | |
553 | } | |
554 | EXPORT_SYMBOL_GPL(mddev_check_plugged); | |
2ac87401 | 555 | |
1da177e4 LT |
556 | static inline mddev_t *mddev_get(mddev_t *mddev) |
557 | { | |
558 | atomic_inc(&mddev->active); | |
559 | return mddev; | |
560 | } | |
561 | ||
5fd3a17e | 562 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 563 | |
1da177e4 LT |
564 | static void mddev_put(mddev_t *mddev) |
565 | { | |
a167f663 N |
566 | struct bio_set *bs = NULL; |
567 | ||
1da177e4 LT |
568 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
569 | return; | |
d3374825 | 570 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
571 | mddev->ctime == 0 && !mddev->hold_active) { |
572 | /* Array is not configured at all, and not held active, | |
573 | * so destroy it */ | |
1da177e4 | 574 | list_del(&mddev->all_mddevs); |
a167f663 N |
575 | bs = mddev->bio_set; |
576 | mddev->bio_set = NULL; | |
d3374825 | 577 | if (mddev->gendisk) { |
e804ac78 TH |
578 | /* We did a probe so need to clean up. Call |
579 | * queue_work inside the spinlock so that | |
580 | * flush_workqueue() after mddev_find will | |
581 | * succeed in waiting for the work to be done. | |
d3374825 N |
582 | */ |
583 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 584 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
585 | } else |
586 | kfree(mddev); | |
587 | } | |
588 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
589 | if (bs) |
590 | bioset_free(bs); | |
1da177e4 LT |
591 | } |
592 | ||
390ee602 | 593 | void mddev_init(mddev_t *mddev) |
fafd7fb0 N |
594 | { |
595 | mutex_init(&mddev->open_mutex); | |
596 | mutex_init(&mddev->reconfig_mutex); | |
597 | mutex_init(&mddev->bitmap_info.mutex); | |
598 | INIT_LIST_HEAD(&mddev->disks); | |
599 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
600 | init_timer(&mddev->safemode_timer); | |
601 | atomic_set(&mddev->active, 1); | |
602 | atomic_set(&mddev->openers, 0); | |
603 | atomic_set(&mddev->active_io, 0); | |
97658cdd | 604 | atomic_set(&mddev->plug_cnt, 0); |
fafd7fb0 N |
605 | spin_lock_init(&mddev->write_lock); |
606 | atomic_set(&mddev->flush_pending, 0); | |
607 | init_waitqueue_head(&mddev->sb_wait); | |
608 | init_waitqueue_head(&mddev->recovery_wait); | |
609 | mddev->reshape_position = MaxSector; | |
610 | mddev->resync_min = 0; | |
611 | mddev->resync_max = MaxSector; | |
612 | mddev->level = LEVEL_NONE; | |
613 | } | |
390ee602 | 614 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 615 | |
1da177e4 LT |
616 | static mddev_t * mddev_find(dev_t unit) |
617 | { | |
618 | mddev_t *mddev, *new = NULL; | |
619 | ||
8f5f02c4 N |
620 | if (unit && MAJOR(unit) != MD_MAJOR) |
621 | unit &= ~((1<<MdpMinorShift)-1); | |
622 | ||
1da177e4 LT |
623 | retry: |
624 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
625 | |
626 | if (unit) { | |
627 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
628 | if (mddev->unit == unit) { | |
629 | mddev_get(mddev); | |
630 | spin_unlock(&all_mddevs_lock); | |
631 | kfree(new); | |
632 | return mddev; | |
633 | } | |
634 | ||
635 | if (new) { | |
636 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 637 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
638 | new->hold_active = UNTIL_IOCTL; |
639 | return new; | |
1da177e4 | 640 | } |
efeb53c0 N |
641 | } else if (new) { |
642 | /* find an unused unit number */ | |
643 | static int next_minor = 512; | |
644 | int start = next_minor; | |
645 | int is_free = 0; | |
646 | int dev = 0; | |
647 | while (!is_free) { | |
648 | dev = MKDEV(MD_MAJOR, next_minor); | |
649 | next_minor++; | |
650 | if (next_minor > MINORMASK) | |
651 | next_minor = 0; | |
652 | if (next_minor == start) { | |
653 | /* Oh dear, all in use. */ | |
654 | spin_unlock(&all_mddevs_lock); | |
655 | kfree(new); | |
656 | return NULL; | |
657 | } | |
658 | ||
659 | is_free = 1; | |
660 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
661 | if (mddev->unit == dev) { | |
662 | is_free = 0; | |
663 | break; | |
664 | } | |
665 | } | |
666 | new->unit = dev; | |
667 | new->md_minor = MINOR(dev); | |
668 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
669 | list_add(&new->all_mddevs, &all_mddevs); |
670 | spin_unlock(&all_mddevs_lock); | |
671 | return new; | |
672 | } | |
673 | spin_unlock(&all_mddevs_lock); | |
674 | ||
9ffae0cf | 675 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
676 | if (!new) |
677 | return NULL; | |
678 | ||
1da177e4 LT |
679 | new->unit = unit; |
680 | if (MAJOR(unit) == MD_MAJOR) | |
681 | new->md_minor = MINOR(unit); | |
682 | else | |
683 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
684 | ||
fafd7fb0 | 685 | mddev_init(new); |
1da177e4 | 686 | |
1da177e4 LT |
687 | goto retry; |
688 | } | |
689 | ||
690 | static inline int mddev_lock(mddev_t * mddev) | |
691 | { | |
df5b89b3 | 692 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
693 | } |
694 | ||
b522adcd DW |
695 | static inline int mddev_is_locked(mddev_t *mddev) |
696 | { | |
697 | return mutex_is_locked(&mddev->reconfig_mutex); | |
698 | } | |
699 | ||
1da177e4 LT |
700 | static inline int mddev_trylock(mddev_t * mddev) |
701 | { | |
df5b89b3 | 702 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
703 | } |
704 | ||
b6eb127d N |
705 | static struct attribute_group md_redundancy_group; |
706 | ||
a64c876f | 707 | static void mddev_unlock(mddev_t * mddev) |
1da177e4 | 708 | { |
a64c876f | 709 | if (mddev->to_remove) { |
b6eb127d N |
710 | /* These cannot be removed under reconfig_mutex as |
711 | * an access to the files will try to take reconfig_mutex | |
712 | * while holding the file unremovable, which leads to | |
713 | * a deadlock. | |
bb4f1e9d N |
714 | * So hold set sysfs_active while the remove in happeing, |
715 | * and anything else which might set ->to_remove or my | |
716 | * otherwise change the sysfs namespace will fail with | |
717 | * -EBUSY if sysfs_active is still set. | |
718 | * We set sysfs_active under reconfig_mutex and elsewhere | |
719 | * test it under the same mutex to ensure its correct value | |
720 | * is seen. | |
b6eb127d | 721 | */ |
a64c876f N |
722 | struct attribute_group *to_remove = mddev->to_remove; |
723 | mddev->to_remove = NULL; | |
bb4f1e9d | 724 | mddev->sysfs_active = 1; |
b6eb127d N |
725 | mutex_unlock(&mddev->reconfig_mutex); |
726 | ||
00bcb4ac N |
727 | if (mddev->kobj.sd) { |
728 | if (to_remove != &md_redundancy_group) | |
729 | sysfs_remove_group(&mddev->kobj, to_remove); | |
730 | if (mddev->pers == NULL || | |
731 | mddev->pers->sync_request == NULL) { | |
732 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
733 | if (mddev->sysfs_action) | |
734 | sysfs_put(mddev->sysfs_action); | |
735 | mddev->sysfs_action = NULL; | |
736 | } | |
a64c876f | 737 | } |
bb4f1e9d | 738 | mddev->sysfs_active = 0; |
b6eb127d N |
739 | } else |
740 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 741 | |
005eca5e | 742 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
743 | } |
744 | ||
2989ddbd | 745 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 746 | { |
159ec1fc | 747 | mdk_rdev_t *rdev; |
1da177e4 | 748 | |
159ec1fc | 749 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
750 | if (rdev->desc_nr == nr) |
751 | return rdev; | |
159ec1fc | 752 | |
1da177e4 LT |
753 | return NULL; |
754 | } | |
755 | ||
756 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
757 | { | |
1da177e4 LT |
758 | mdk_rdev_t *rdev; |
759 | ||
159ec1fc | 760 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
761 | if (rdev->bdev->bd_dev == dev) |
762 | return rdev; | |
159ec1fc | 763 | |
1da177e4 LT |
764 | return NULL; |
765 | } | |
766 | ||
d9d166c2 | 767 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
768 | { |
769 | struct mdk_personality *pers; | |
d9d166c2 N |
770 | list_for_each_entry(pers, &pers_list, list) { |
771 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 772 | return pers; |
d9d166c2 N |
773 | if (strcmp(pers->name, clevel)==0) |
774 | return pers; | |
775 | } | |
2604b703 N |
776 | return NULL; |
777 | } | |
778 | ||
b73df2d3 | 779 | /* return the offset of the super block in 512byte sectors */ |
57b2caa3 | 780 | static inline sector_t calc_dev_sboffset(mdk_rdev_t *rdev) |
1da177e4 | 781 | { |
57b2caa3 | 782 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 783 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
784 | } |
785 | ||
1da177e4 LT |
786 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
787 | { | |
788 | if (rdev->sb_page) | |
789 | MD_BUG(); | |
790 | ||
791 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
792 | if (!rdev->sb_page) { | |
793 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 794 | return -ENOMEM; |
1da177e4 LT |
795 | } |
796 | ||
797 | return 0; | |
798 | } | |
799 | ||
800 | static void free_disk_sb(mdk_rdev_t * rdev) | |
801 | { | |
802 | if (rdev->sb_page) { | |
2d1f3b5d | 803 | put_page(rdev->sb_page); |
1da177e4 LT |
804 | rdev->sb_loaded = 0; |
805 | rdev->sb_page = NULL; | |
0f420358 | 806 | rdev->sb_start = 0; |
dd8ac336 | 807 | rdev->sectors = 0; |
1da177e4 | 808 | } |
2699b672 N |
809 | if (rdev->bb_page) { |
810 | put_page(rdev->bb_page); | |
811 | rdev->bb_page = NULL; | |
812 | } | |
1da177e4 LT |
813 | } |
814 | ||
815 | ||
6712ecf8 | 816 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
817 | { |
818 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 819 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 820 | |
3a0f5bbb N |
821 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
822 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
823 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
824 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 825 | md_error(mddev, rdev); |
3a0f5bbb | 826 | } |
7bfa19f2 | 827 | |
a9701a30 N |
828 | if (atomic_dec_and_test(&mddev->pending_writes)) |
829 | wake_up(&mddev->sb_wait); | |
f8b58edf | 830 | bio_put(bio); |
7bfa19f2 N |
831 | } |
832 | ||
833 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, | |
834 | sector_t sector, int size, struct page *page) | |
835 | { | |
836 | /* write first size bytes of page to sector of rdev | |
837 | * Increment mddev->pending_writes before returning | |
838 | * and decrement it on completion, waking up sb_wait | |
839 | * if zero is reached. | |
840 | * If an error occurred, call md_error | |
841 | */ | |
a167f663 | 842 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 843 | |
a6ff7e08 | 844 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
7bfa19f2 N |
845 | bio->bi_sector = sector; |
846 | bio_add_page(bio, page, size, 0); | |
847 | bio->bi_private = rdev; | |
848 | bio->bi_end_io = super_written; | |
a9701a30 | 849 | |
7bfa19f2 | 850 | atomic_inc(&mddev->pending_writes); |
721a9602 | 851 | submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio); |
a9701a30 N |
852 | } |
853 | ||
854 | void md_super_wait(mddev_t *mddev) | |
855 | { | |
e9c7469b | 856 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
857 | DEFINE_WAIT(wq); |
858 | for(;;) { | |
859 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
860 | if (atomic_read(&mddev->pending_writes)==0) | |
861 | break; | |
a9701a30 N |
862 | schedule(); |
863 | } | |
864 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
865 | } |
866 | ||
6712ecf8 | 867 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 868 | { |
1da177e4 | 869 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
870 | } |
871 | ||
2b193363 | 872 | int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size, |
ccebd4c4 | 873 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 874 | { |
a167f663 | 875 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
876 | struct completion event; |
877 | int ret; | |
878 | ||
721a9602 | 879 | rw |= REQ_SYNC; |
1da177e4 | 880 | |
a6ff7e08 JB |
881 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
882 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 JB |
883 | if (metadata_op) |
884 | bio->bi_sector = sector + rdev->sb_start; | |
885 | else | |
886 | bio->bi_sector = sector + rdev->data_offset; | |
1da177e4 LT |
887 | bio_add_page(bio, page, size, 0); |
888 | init_completion(&event); | |
889 | bio->bi_private = &event; | |
890 | bio->bi_end_io = bi_complete; | |
891 | submit_bio(rw, bio); | |
892 | wait_for_completion(&event); | |
893 | ||
894 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
895 | bio_put(bio); | |
896 | return ret; | |
897 | } | |
a8745db2 | 898 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 899 | |
0002b271 | 900 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
901 | { |
902 | char b[BDEVNAME_SIZE]; | |
903 | if (!rdev->sb_page) { | |
904 | MD_BUG(); | |
905 | return -EINVAL; | |
906 | } | |
907 | if (rdev->sb_loaded) | |
908 | return 0; | |
909 | ||
910 | ||
ccebd4c4 | 911 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
912 | goto fail; |
913 | rdev->sb_loaded = 1; | |
914 | return 0; | |
915 | ||
916 | fail: | |
917 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
918 | bdevname(rdev->bdev,b)); | |
919 | return -EINVAL; | |
920 | } | |
921 | ||
922 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
923 | { | |
05710466 AN |
924 | return sb1->set_uuid0 == sb2->set_uuid0 && |
925 | sb1->set_uuid1 == sb2->set_uuid1 && | |
926 | sb1->set_uuid2 == sb2->set_uuid2 && | |
927 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
928 | } |
929 | ||
1da177e4 LT |
930 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
931 | { | |
932 | int ret; | |
933 | mdp_super_t *tmp1, *tmp2; | |
934 | ||
935 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
936 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
937 | ||
938 | if (!tmp1 || !tmp2) { | |
939 | ret = 0; | |
35020f1a | 940 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
941 | goto abort; |
942 | } | |
943 | ||
944 | *tmp1 = *sb1; | |
945 | *tmp2 = *sb2; | |
946 | ||
947 | /* | |
948 | * nr_disks is not constant | |
949 | */ | |
950 | tmp1->nr_disks = 0; | |
951 | tmp2->nr_disks = 0; | |
952 | ||
ce0c8e05 | 953 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 954 | abort: |
990a8baf JJ |
955 | kfree(tmp1); |
956 | kfree(tmp2); | |
1da177e4 LT |
957 | return ret; |
958 | } | |
959 | ||
4d167f09 N |
960 | |
961 | static u32 md_csum_fold(u32 csum) | |
962 | { | |
963 | csum = (csum & 0xffff) + (csum >> 16); | |
964 | return (csum & 0xffff) + (csum >> 16); | |
965 | } | |
966 | ||
1da177e4 LT |
967 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
968 | { | |
4d167f09 N |
969 | u64 newcsum = 0; |
970 | u32 *sb32 = (u32*)sb; | |
971 | int i; | |
1da177e4 LT |
972 | unsigned int disk_csum, csum; |
973 | ||
974 | disk_csum = sb->sb_csum; | |
975 | sb->sb_csum = 0; | |
4d167f09 N |
976 | |
977 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
978 | newcsum += sb32[i]; | |
979 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
980 | ||
981 | ||
982 | #ifdef CONFIG_ALPHA | |
983 | /* This used to use csum_partial, which was wrong for several | |
984 | * reasons including that different results are returned on | |
985 | * different architectures. It isn't critical that we get exactly | |
986 | * the same return value as before (we always csum_fold before | |
987 | * testing, and that removes any differences). However as we | |
988 | * know that csum_partial always returned a 16bit value on | |
989 | * alphas, do a fold to maximise conformity to previous behaviour. | |
990 | */ | |
991 | sb->sb_csum = md_csum_fold(disk_csum); | |
992 | #else | |
1da177e4 | 993 | sb->sb_csum = disk_csum; |
4d167f09 | 994 | #endif |
1da177e4 LT |
995 | return csum; |
996 | } | |
997 | ||
998 | ||
999 | /* | |
1000 | * Handle superblock details. | |
1001 | * We want to be able to handle multiple superblock formats | |
1002 | * so we have a common interface to them all, and an array of | |
1003 | * different handlers. | |
1004 | * We rely on user-space to write the initial superblock, and support | |
1005 | * reading and updating of superblocks. | |
1006 | * Interface methods are: | |
1007 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
1008 | * loads and validates a superblock on dev. | |
1009 | * if refdev != NULL, compare superblocks on both devices | |
1010 | * Return: | |
1011 | * 0 - dev has a superblock that is compatible with refdev | |
1012 | * 1 - dev has a superblock that is compatible and newer than refdev | |
1013 | * so dev should be used as the refdev in future | |
1014 | * -EINVAL superblock incompatible or invalid | |
1015 | * -othererror e.g. -EIO | |
1016 | * | |
1017 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
1018 | * Verify that dev is acceptable into mddev. | |
1019 | * The first time, mddev->raid_disks will be 0, and data from | |
1020 | * dev should be merged in. Subsequent calls check that dev | |
1021 | * is new enough. Return 0 or -EINVAL | |
1022 | * | |
1023 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
1024 | * Update the superblock for rdev with data in mddev | |
1025 | * This does not write to disc. | |
1026 | * | |
1027 | */ | |
1028 | ||
1029 | struct super_type { | |
0cd17fec CW |
1030 | char *name; |
1031 | struct module *owner; | |
1032 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
1033 | int minor_version); | |
1034 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
1035 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
1036 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 1037 | sector_t num_sectors); |
1da177e4 LT |
1038 | }; |
1039 | ||
0894cc30 AN |
1040 | /* |
1041 | * Check that the given mddev has no bitmap. | |
1042 | * | |
1043 | * This function is called from the run method of all personalities that do not | |
1044 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
1045 | * has a bitmap. Otherwise, it returns 0. | |
1046 | * | |
1047 | */ | |
1048 | int md_check_no_bitmap(mddev_t *mddev) | |
1049 | { | |
c3d9714e | 1050 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
1051 | return 0; |
1052 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
1053 | mdname(mddev), mddev->pers->name); | |
1054 | return 1; | |
1055 | } | |
1056 | EXPORT_SYMBOL(md_check_no_bitmap); | |
1057 | ||
1da177e4 LT |
1058 | /* |
1059 | * load_super for 0.90.0 | |
1060 | */ | |
1061 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1062 | { | |
1063 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
1064 | mdp_super_t *sb; | |
1065 | int ret; | |
1da177e4 LT |
1066 | |
1067 | /* | |
0f420358 | 1068 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
1069 | * it's at the end of the disk. |
1070 | * | |
1071 | * It also happens to be a multiple of 4Kb. | |
1072 | */ | |
57b2caa3 | 1073 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 1074 | |
0002b271 | 1075 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
1076 | if (ret) return ret; |
1077 | ||
1078 | ret = -EINVAL; | |
1079 | ||
1080 | bdevname(rdev->bdev, b); | |
65a06f06 | 1081 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1082 | |
1083 | if (sb->md_magic != MD_SB_MAGIC) { | |
1084 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
1085 | b); | |
1086 | goto abort; | |
1087 | } | |
1088 | ||
1089 | if (sb->major_version != 0 || | |
f6705578 N |
1090 | sb->minor_version < 90 || |
1091 | sb->minor_version > 91) { | |
1da177e4 LT |
1092 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1093 | sb->major_version, sb->minor_version, | |
1094 | b); | |
1095 | goto abort; | |
1096 | } | |
1097 | ||
1098 | if (sb->raid_disks <= 0) | |
1099 | goto abort; | |
1100 | ||
4d167f09 | 1101 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1102 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1103 | b); | |
1104 | goto abort; | |
1105 | } | |
1106 | ||
1107 | rdev->preferred_minor = sb->md_minor; | |
1108 | rdev->data_offset = 0; | |
0002b271 | 1109 | rdev->sb_size = MD_SB_BYTES; |
9f2f3830 | 1110 | rdev->badblocks.shift = -1; |
1da177e4 LT |
1111 | |
1112 | if (sb->level == LEVEL_MULTIPATH) | |
1113 | rdev->desc_nr = -1; | |
1114 | else | |
1115 | rdev->desc_nr = sb->this_disk.number; | |
1116 | ||
9a7b2b0f | 1117 | if (!refdev) { |
1da177e4 | 1118 | ret = 1; |
9a7b2b0f | 1119 | } else { |
1da177e4 | 1120 | __u64 ev1, ev2; |
65a06f06 | 1121 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1122 | if (!uuid_equal(refsb, sb)) { |
1123 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1124 | b, bdevname(refdev->bdev,b2)); | |
1125 | goto abort; | |
1126 | } | |
1127 | if (!sb_equal(refsb, sb)) { | |
1128 | printk(KERN_WARNING "md: %s has same UUID" | |
1129 | " but different superblock to %s\n", | |
1130 | b, bdevname(refdev->bdev, b2)); | |
1131 | goto abort; | |
1132 | } | |
1133 | ev1 = md_event(sb); | |
1134 | ev2 = md_event(refsb); | |
1135 | if (ev1 > ev2) | |
1136 | ret = 1; | |
1137 | else | |
1138 | ret = 0; | |
1139 | } | |
8190e754 | 1140 | rdev->sectors = rdev->sb_start; |
1da177e4 | 1141 | |
dd8ac336 | 1142 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
1143 | /* "this cannot possibly happen" ... */ |
1144 | ret = -EINVAL; | |
1145 | ||
1da177e4 LT |
1146 | abort: |
1147 | return ret; | |
1148 | } | |
1149 | ||
1150 | /* | |
1151 | * validate_super for 0.90.0 | |
1152 | */ | |
1153 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1154 | { | |
1155 | mdp_disk_t *desc; | |
65a06f06 | 1156 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1157 | __u64 ev1 = md_event(sb); |
1da177e4 | 1158 | |
41158c7e | 1159 | rdev->raid_disk = -1; |
c5d79adb N |
1160 | clear_bit(Faulty, &rdev->flags); |
1161 | clear_bit(In_sync, &rdev->flags); | |
1162 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1163 | |
1da177e4 LT |
1164 | if (mddev->raid_disks == 0) { |
1165 | mddev->major_version = 0; | |
1166 | mddev->minor_version = sb->minor_version; | |
1167 | mddev->patch_version = sb->patch_version; | |
e691063a | 1168 | mddev->external = 0; |
9d8f0363 | 1169 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1170 | mddev->ctime = sb->ctime; |
1171 | mddev->utime = sb->utime; | |
1172 | mddev->level = sb->level; | |
d9d166c2 | 1173 | mddev->clevel[0] = 0; |
1da177e4 LT |
1174 | mddev->layout = sb->layout; |
1175 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 1176 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 1177 | mddev->events = ev1; |
c3d9714e N |
1178 | mddev->bitmap_info.offset = 0; |
1179 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1180 | |
f6705578 N |
1181 | if (mddev->minor_version >= 91) { |
1182 | mddev->reshape_position = sb->reshape_position; | |
1183 | mddev->delta_disks = sb->delta_disks; | |
1184 | mddev->new_level = sb->new_level; | |
1185 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1186 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1187 | } else { |
1188 | mddev->reshape_position = MaxSector; | |
1189 | mddev->delta_disks = 0; | |
1190 | mddev->new_level = mddev->level; | |
1191 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1192 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1193 | } |
1194 | ||
1da177e4 LT |
1195 | if (sb->state & (1<<MD_SB_CLEAN)) |
1196 | mddev->recovery_cp = MaxSector; | |
1197 | else { | |
1198 | if (sb->events_hi == sb->cp_events_hi && | |
1199 | sb->events_lo == sb->cp_events_lo) { | |
1200 | mddev->recovery_cp = sb->recovery_cp; | |
1201 | } else | |
1202 | mddev->recovery_cp = 0; | |
1203 | } | |
1204 | ||
1205 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1206 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1207 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1208 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1209 | ||
1210 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1211 | |
1212 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1213 | mddev->bitmap_info.file == NULL) |
1214 | mddev->bitmap_info.offset = | |
1215 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1216 | |
41158c7e | 1217 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1218 | /* Insist on good event counter while assembling, except |
1219 | * for spares (which don't need an event count) */ | |
1da177e4 | 1220 | ++ev1; |
be6800a7 N |
1221 | if (sb->disks[rdev->desc_nr].state & ( |
1222 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1223 | if (ev1 < mddev->events) | |
1224 | return -EINVAL; | |
41158c7e N |
1225 | } else if (mddev->bitmap) { |
1226 | /* if adding to array with a bitmap, then we can accept an | |
1227 | * older device ... but not too old. | |
1228 | */ | |
41158c7e N |
1229 | if (ev1 < mddev->bitmap->events_cleared) |
1230 | return 0; | |
07d84d10 N |
1231 | } else { |
1232 | if (ev1 < mddev->events) | |
1233 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1234 | return 0; | |
1235 | } | |
41158c7e | 1236 | |
1da177e4 | 1237 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1238 | desc = sb->disks + rdev->desc_nr; |
1239 | ||
1240 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1241 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1242 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1243 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1244 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1245 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1246 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1247 | /* active but not in sync implies recovery up to | |
1248 | * reshape position. We don't know exactly where | |
1249 | * that is, so set to zero for now */ | |
1250 | if (mddev->minor_version >= 91) { | |
1251 | rdev->recovery_offset = 0; | |
1252 | rdev->raid_disk = desc->raid_disk; | |
1253 | } | |
1da177e4 | 1254 | } |
8ddf9efe N |
1255 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1256 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1257 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1258 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1259 | return 0; |
1260 | } | |
1261 | ||
1262 | /* | |
1263 | * sync_super for 0.90.0 | |
1264 | */ | |
1265 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1266 | { | |
1267 | mdp_super_t *sb; | |
1da177e4 LT |
1268 | mdk_rdev_t *rdev2; |
1269 | int next_spare = mddev->raid_disks; | |
19133a42 | 1270 | |
1da177e4 LT |
1271 | |
1272 | /* make rdev->sb match mddev data.. | |
1273 | * | |
1274 | * 1/ zero out disks | |
1275 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1276 | * 3/ any empty disks < next_spare become removed | |
1277 | * | |
1278 | * disks[0] gets initialised to REMOVED because | |
1279 | * we cannot be sure from other fields if it has | |
1280 | * been initialised or not. | |
1281 | */ | |
1282 | int i; | |
1283 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1284 | ||
61181565 N |
1285 | rdev->sb_size = MD_SB_BYTES; |
1286 | ||
65a06f06 | 1287 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1288 | |
1289 | memset(sb, 0, sizeof(*sb)); | |
1290 | ||
1291 | sb->md_magic = MD_SB_MAGIC; | |
1292 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1293 | sb->patch_version = mddev->patch_version; |
1294 | sb->gvalid_words = 0; /* ignored */ | |
1295 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1296 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1297 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1298 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1299 | ||
1300 | sb->ctime = mddev->ctime; | |
1301 | sb->level = mddev->level; | |
58c0fed4 | 1302 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1303 | sb->raid_disks = mddev->raid_disks; |
1304 | sb->md_minor = mddev->md_minor; | |
e691063a | 1305 | sb->not_persistent = 0; |
1da177e4 LT |
1306 | sb->utime = mddev->utime; |
1307 | sb->state = 0; | |
1308 | sb->events_hi = (mddev->events>>32); | |
1309 | sb->events_lo = (u32)mddev->events; | |
1310 | ||
f6705578 N |
1311 | if (mddev->reshape_position == MaxSector) |
1312 | sb->minor_version = 90; | |
1313 | else { | |
1314 | sb->minor_version = 91; | |
1315 | sb->reshape_position = mddev->reshape_position; | |
1316 | sb->new_level = mddev->new_level; | |
1317 | sb->delta_disks = mddev->delta_disks; | |
1318 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1319 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1320 | } |
1321 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1322 | if (mddev->in_sync) |
1323 | { | |
1324 | sb->recovery_cp = mddev->recovery_cp; | |
1325 | sb->cp_events_hi = (mddev->events>>32); | |
1326 | sb->cp_events_lo = (u32)mddev->events; | |
1327 | if (mddev->recovery_cp == MaxSector) | |
1328 | sb->state = (1<< MD_SB_CLEAN); | |
1329 | } else | |
1330 | sb->recovery_cp = 0; | |
1331 | ||
1332 | sb->layout = mddev->layout; | |
9d8f0363 | 1333 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1334 | |
c3d9714e | 1335 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1336 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1337 | ||
1da177e4 | 1338 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1339 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1340 | mdp_disk_t *d; |
86e6ffdd | 1341 | int desc_nr; |
0261cd9f N |
1342 | int is_active = test_bit(In_sync, &rdev2->flags); |
1343 | ||
1344 | if (rdev2->raid_disk >= 0 && | |
1345 | sb->minor_version >= 91) | |
1346 | /* we have nowhere to store the recovery_offset, | |
1347 | * but if it is not below the reshape_position, | |
1348 | * we can piggy-back on that. | |
1349 | */ | |
1350 | is_active = 1; | |
1351 | if (rdev2->raid_disk < 0 || | |
1352 | test_bit(Faulty, &rdev2->flags)) | |
1353 | is_active = 0; | |
1354 | if (is_active) | |
86e6ffdd | 1355 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1356 | else |
86e6ffdd | 1357 | desc_nr = next_spare++; |
19133a42 | 1358 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1359 | d = &sb->disks[rdev2->desc_nr]; |
1360 | nr_disks++; | |
1361 | d->number = rdev2->desc_nr; | |
1362 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1363 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1364 | if (is_active) |
1da177e4 LT |
1365 | d->raid_disk = rdev2->raid_disk; |
1366 | else | |
1367 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1368 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1369 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1370 | else if (is_active) { |
1da177e4 | 1371 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1372 | if (test_bit(In_sync, &rdev2->flags)) |
1373 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1374 | active++; |
1375 | working++; | |
1376 | } else { | |
1377 | d->state = 0; | |
1378 | spare++; | |
1379 | working++; | |
1380 | } | |
8ddf9efe N |
1381 | if (test_bit(WriteMostly, &rdev2->flags)) |
1382 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1383 | } |
1da177e4 LT |
1384 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1385 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1386 | mdp_disk_t *d = &sb->disks[i]; | |
1387 | if (d->state == 0 && d->number == 0) { | |
1388 | d->number = i; | |
1389 | d->raid_disk = i; | |
1390 | d->state = (1<<MD_DISK_REMOVED); | |
1391 | d->state |= (1<<MD_DISK_FAULTY); | |
1392 | failed++; | |
1393 | } | |
1394 | } | |
1395 | sb->nr_disks = nr_disks; | |
1396 | sb->active_disks = active; | |
1397 | sb->working_disks = working; | |
1398 | sb->failed_disks = failed; | |
1399 | sb->spare_disks = spare; | |
1400 | ||
1401 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1402 | sb->sb_csum = calc_sb_csum(sb); | |
1403 | } | |
1404 | ||
0cd17fec CW |
1405 | /* |
1406 | * rdev_size_change for 0.90.0 | |
1407 | */ | |
1408 | static unsigned long long | |
15f4a5fd | 1409 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1410 | { |
58c0fed4 | 1411 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1412 | return 0; /* component must fit device */ |
c3d9714e | 1413 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1414 | return 0; /* can't move bitmap */ |
57b2caa3 | 1415 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1416 | if (!num_sectors || num_sectors > rdev->sb_start) |
1417 | num_sectors = rdev->sb_start; | |
0f420358 | 1418 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1419 | rdev->sb_page); |
1420 | md_super_wait(rdev->mddev); | |
c26a44ed | 1421 | return num_sectors; |
0cd17fec CW |
1422 | } |
1423 | ||
1424 | ||
1da177e4 LT |
1425 | /* |
1426 | * version 1 superblock | |
1427 | */ | |
1428 | ||
1c05b4bc | 1429 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1430 | { |
1c05b4bc N |
1431 | __le32 disk_csum; |
1432 | u32 csum; | |
1da177e4 LT |
1433 | unsigned long long newcsum; |
1434 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1435 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1436 | int i; |
1437 | ||
1438 | disk_csum = sb->sb_csum; | |
1439 | sb->sb_csum = 0; | |
1440 | newcsum = 0; | |
1441 | for (i=0; size>=4; size -= 4 ) | |
1442 | newcsum += le32_to_cpu(*isuper++); | |
1443 | ||
1444 | if (size == 2) | |
1c05b4bc | 1445 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1446 | |
1447 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1448 | sb->sb_csum = disk_csum; | |
1449 | return cpu_to_le32(csum); | |
1450 | } | |
1451 | ||
2699b672 N |
1452 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1453 | int acknowledged); | |
1da177e4 LT |
1454 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) |
1455 | { | |
1456 | struct mdp_superblock_1 *sb; | |
1457 | int ret; | |
0f420358 | 1458 | sector_t sb_start; |
1da177e4 | 1459 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1460 | int bmask; |
1da177e4 LT |
1461 | |
1462 | /* | |
0f420358 | 1463 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1464 | * It is always aligned to a 4K boundary and |
1465 | * depeding on minor_version, it can be: | |
1466 | * 0: At least 8K, but less than 12K, from end of device | |
1467 | * 1: At start of device | |
1468 | * 2: 4K from start of device. | |
1469 | */ | |
1470 | switch(minor_version) { | |
1471 | case 0: | |
77304d2a | 1472 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1473 | sb_start -= 8*2; |
1474 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1475 | break; |
1476 | case 1: | |
0f420358 | 1477 | sb_start = 0; |
1da177e4 LT |
1478 | break; |
1479 | case 2: | |
0f420358 | 1480 | sb_start = 8; |
1da177e4 LT |
1481 | break; |
1482 | default: | |
1483 | return -EINVAL; | |
1484 | } | |
0f420358 | 1485 | rdev->sb_start = sb_start; |
1da177e4 | 1486 | |
0002b271 N |
1487 | /* superblock is rarely larger than 1K, but it can be larger, |
1488 | * and it is safe to read 4k, so we do that | |
1489 | */ | |
1490 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1491 | if (ret) return ret; |
1492 | ||
1493 | ||
65a06f06 | 1494 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1495 | |
1496 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1497 | sb->major_version != cpu_to_le32(1) || | |
1498 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1499 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1500 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1501 | return -EINVAL; |
1502 | ||
1503 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1504 | printk("md: invalid superblock checksum on %s\n", | |
1505 | bdevname(rdev->bdev,b)); | |
1506 | return -EINVAL; | |
1507 | } | |
1508 | if (le64_to_cpu(sb->data_size) < 10) { | |
1509 | printk("md: data_size too small on %s\n", | |
1510 | bdevname(rdev->bdev,b)); | |
1511 | return -EINVAL; | |
1512 | } | |
e11e93fa | 1513 | |
1da177e4 LT |
1514 | rdev->preferred_minor = 0xffff; |
1515 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1516 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1517 | |
0002b271 | 1518 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1519 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1520 | if (rdev->sb_size & bmask) |
a1801f85 N |
1521 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1522 | ||
1523 | if (minor_version | |
0f420358 | 1524 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1525 | return -EINVAL; |
0002b271 | 1526 | |
31b65a0d N |
1527 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1528 | rdev->desc_nr = -1; | |
1529 | else | |
1530 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1531 | ||
2699b672 N |
1532 | if (!rdev->bb_page) { |
1533 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1534 | if (!rdev->bb_page) | |
1535 | return -ENOMEM; | |
1536 | } | |
1537 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1538 | rdev->badblocks.count == 0) { | |
1539 | /* need to load the bad block list. | |
1540 | * Currently we limit it to one page. | |
1541 | */ | |
1542 | s32 offset; | |
1543 | sector_t bb_sector; | |
1544 | u64 *bbp; | |
1545 | int i; | |
1546 | int sectors = le16_to_cpu(sb->bblog_size); | |
1547 | if (sectors > (PAGE_SIZE / 512)) | |
1548 | return -EINVAL; | |
1549 | offset = le32_to_cpu(sb->bblog_offset); | |
1550 | if (offset == 0) | |
1551 | return -EINVAL; | |
1552 | bb_sector = (long long)offset; | |
1553 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1554 | rdev->bb_page, READ, true)) | |
1555 | return -EIO; | |
1556 | bbp = (u64 *)page_address(rdev->bb_page); | |
1557 | rdev->badblocks.shift = sb->bblog_shift; | |
1558 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1559 | u64 bb = le64_to_cpu(*bbp); | |
1560 | int count = bb & (0x3ff); | |
1561 | u64 sector = bb >> 10; | |
1562 | sector <<= sb->bblog_shift; | |
1563 | count <<= sb->bblog_shift; | |
1564 | if (bb + 1 == 0) | |
1565 | break; | |
1566 | if (md_set_badblocks(&rdev->badblocks, | |
1567 | sector, count, 1) == 0) | |
1568 | return -EINVAL; | |
1569 | } | |
1570 | } else if (sb->bblog_offset == 0) | |
1571 | rdev->badblocks.shift = -1; | |
1572 | ||
9a7b2b0f | 1573 | if (!refdev) { |
8ed75463 | 1574 | ret = 1; |
9a7b2b0f | 1575 | } else { |
1da177e4 | 1576 | __u64 ev1, ev2; |
65a06f06 | 1577 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1578 | |
1579 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1580 | sb->level != refsb->level || | |
1581 | sb->layout != refsb->layout || | |
1582 | sb->chunksize != refsb->chunksize) { | |
1583 | printk(KERN_WARNING "md: %s has strangely different" | |
1584 | " superblock to %s\n", | |
1585 | bdevname(rdev->bdev,b), | |
1586 | bdevname(refdev->bdev,b2)); | |
1587 | return -EINVAL; | |
1588 | } | |
1589 | ev1 = le64_to_cpu(sb->events); | |
1590 | ev2 = le64_to_cpu(refsb->events); | |
1591 | ||
1592 | if (ev1 > ev2) | |
8ed75463 N |
1593 | ret = 1; |
1594 | else | |
1595 | ret = 0; | |
1da177e4 | 1596 | } |
a1801f85 | 1597 | if (minor_version) |
77304d2a | 1598 | rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 1599 | le64_to_cpu(sb->data_offset); |
1da177e4 | 1600 | else |
dd8ac336 AN |
1601 | rdev->sectors = rdev->sb_start; |
1602 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1603 | return -EINVAL; |
dd8ac336 | 1604 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1605 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1606 | return -EINVAL; |
8ed75463 | 1607 | return ret; |
1da177e4 LT |
1608 | } |
1609 | ||
1610 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1611 | { | |
65a06f06 | 1612 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1613 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1614 | |
41158c7e | 1615 | rdev->raid_disk = -1; |
c5d79adb N |
1616 | clear_bit(Faulty, &rdev->flags); |
1617 | clear_bit(In_sync, &rdev->flags); | |
1618 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1619 | |
1da177e4 LT |
1620 | if (mddev->raid_disks == 0) { |
1621 | mddev->major_version = 1; | |
1622 | mddev->patch_version = 0; | |
e691063a | 1623 | mddev->external = 0; |
9d8f0363 | 1624 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1625 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1626 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1627 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1628 | mddev->clevel[0] = 0; |
1da177e4 LT |
1629 | mddev->layout = le32_to_cpu(sb->layout); |
1630 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1631 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1632 | mddev->events = ev1; |
c3d9714e N |
1633 | mddev->bitmap_info.offset = 0; |
1634 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1635 | |
1636 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1637 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1638 | ||
1639 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1640 | |
71c0805c | 1641 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1642 | mddev->bitmap_info.file == NULL ) |
1643 | mddev->bitmap_info.offset = | |
1644 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1645 | |
f6705578 N |
1646 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1647 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1648 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1649 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1650 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1651 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1652 | } else { |
1653 | mddev->reshape_position = MaxSector; | |
1654 | mddev->delta_disks = 0; | |
1655 | mddev->new_level = mddev->level; | |
1656 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1657 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1658 | } |
1659 | ||
41158c7e | 1660 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1661 | /* Insist of good event counter while assembling, except for |
1662 | * spares (which don't need an event count) */ | |
1da177e4 | 1663 | ++ev1; |
be6800a7 N |
1664 | if (rdev->desc_nr >= 0 && |
1665 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1666 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1667 | if (ev1 < mddev->events) | |
1668 | return -EINVAL; | |
41158c7e N |
1669 | } else if (mddev->bitmap) { |
1670 | /* If adding to array with a bitmap, then we can accept an | |
1671 | * older device, but not too old. | |
1672 | */ | |
41158c7e N |
1673 | if (ev1 < mddev->bitmap->events_cleared) |
1674 | return 0; | |
07d84d10 N |
1675 | } else { |
1676 | if (ev1 < mddev->events) | |
1677 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1678 | return 0; | |
1679 | } | |
1da177e4 LT |
1680 | if (mddev->level != LEVEL_MULTIPATH) { |
1681 | int role; | |
3673f305 N |
1682 | if (rdev->desc_nr < 0 || |
1683 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1684 | role = 0xffff; | |
1685 | rdev->desc_nr = -1; | |
1686 | } else | |
1687 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1688 | switch(role) { |
1689 | case 0xffff: /* spare */ | |
1da177e4 LT |
1690 | break; |
1691 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1692 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1693 | break; |
1694 | default: | |
5fd6c1dc N |
1695 | if ((le32_to_cpu(sb->feature_map) & |
1696 | MD_FEATURE_RECOVERY_OFFSET)) | |
1697 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1698 | else | |
1699 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1700 | rdev->raid_disk = role; |
1701 | break; | |
1702 | } | |
8ddf9efe N |
1703 | if (sb->devflags & WriteMostly1) |
1704 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1705 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1706 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1707 | |
1da177e4 LT |
1708 | return 0; |
1709 | } | |
1710 | ||
1711 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1712 | { | |
1713 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1714 | mdk_rdev_t *rdev2; |
1715 | int max_dev, i; | |
1716 | /* make rdev->sb match mddev and rdev data. */ | |
1717 | ||
65a06f06 | 1718 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1719 | |
1720 | sb->feature_map = 0; | |
1721 | sb->pad0 = 0; | |
5fd6c1dc | 1722 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 | 1723 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1da177e4 LT |
1724 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1725 | ||
1726 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1727 | sb->events = cpu_to_le64(mddev->events); | |
1728 | if (mddev->in_sync) | |
1729 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1730 | else | |
1731 | sb->resync_offset = cpu_to_le64(0); | |
1732 | ||
1c05b4bc | 1733 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1734 | |
f0ca340c | 1735 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1736 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1737 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1738 | sb->level = cpu_to_le32(mddev->level); |
1739 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1740 | |
c3d9714e N |
1741 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1742 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1743 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1744 | } |
5fd6c1dc N |
1745 | |
1746 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1747 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1748 | sb->feature_map |= |
1749 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1750 | sb->recovery_offset = | |
1751 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1752 | } |
1753 | ||
f6705578 N |
1754 | if (mddev->reshape_position != MaxSector) { |
1755 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1756 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1757 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1758 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1759 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1760 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1761 | } |
a654b9d8 | 1762 | |
2699b672 N |
1763 | if (rdev->badblocks.count == 0) |
1764 | /* Nothing to do for bad blocks*/ ; | |
1765 | else if (sb->bblog_offset == 0) | |
1766 | /* Cannot record bad blocks on this device */ | |
1767 | md_error(mddev, rdev); | |
1768 | else { | |
1769 | struct badblocks *bb = &rdev->badblocks; | |
1770 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1771 | u64 *p = bb->page; | |
1772 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1773 | if (bb->changed) { | |
1774 | unsigned seq; | |
1775 | ||
1776 | retry: | |
1777 | seq = read_seqbegin(&bb->lock); | |
1778 | ||
1779 | memset(bbp, 0xff, PAGE_SIZE); | |
1780 | ||
1781 | for (i = 0 ; i < bb->count ; i++) { | |
1782 | u64 internal_bb = *p++; | |
1783 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) | |
1784 | | BB_LEN(internal_bb)); | |
1785 | *bbp++ = cpu_to_le64(store_bb); | |
1786 | } | |
1787 | if (read_seqretry(&bb->lock, seq)) | |
1788 | goto retry; | |
1789 | ||
1790 | bb->sector = (rdev->sb_start + | |
1791 | (int)le32_to_cpu(sb->bblog_offset)); | |
1792 | bb->size = le16_to_cpu(sb->bblog_size); | |
1793 | bb->changed = 0; | |
1794 | } | |
1795 | } | |
1796 | ||
1da177e4 | 1797 | max_dev = 0; |
159ec1fc | 1798 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1799 | if (rdev2->desc_nr+1 > max_dev) |
1800 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1801 | |
70471daf N |
1802 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1803 | int bmask; | |
a778b73f | 1804 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1805 | rdev->sb_size = max_dev * 2 + 256; |
1806 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1807 | if (rdev->sb_size & bmask) | |
1808 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1809 | } else |
1810 | max_dev = le32_to_cpu(sb->max_dev); | |
1811 | ||
1da177e4 LT |
1812 | for (i=0; i<max_dev;i++) |
1813 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1814 | ||
159ec1fc | 1815 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1816 | i = rdev2->desc_nr; |
b2d444d7 | 1817 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1818 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1819 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1820 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1821 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1822 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1823 | else |
1824 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1825 | } | |
1826 | ||
1da177e4 LT |
1827 | sb->sb_csum = calc_sb_1_csum(sb); |
1828 | } | |
1829 | ||
0cd17fec | 1830 | static unsigned long long |
15f4a5fd | 1831 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1832 | { |
1833 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1834 | sector_t max_sectors; |
58c0fed4 | 1835 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1836 | return 0; /* component must fit device */ |
0f420358 | 1837 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1838 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1839 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1840 | max_sectors -= rdev->data_offset; |
1841 | if (!num_sectors || num_sectors > max_sectors) | |
1842 | num_sectors = max_sectors; | |
c3d9714e | 1843 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1844 | /* minor version 0 with bitmap we can't move */ |
1845 | return 0; | |
1846 | } else { | |
1847 | /* minor version 0; superblock after data */ | |
0f420358 | 1848 | sector_t sb_start; |
77304d2a | 1849 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1850 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1851 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1852 | if (!num_sectors || num_sectors > max_sectors) |
1853 | num_sectors = max_sectors; | |
0f420358 | 1854 | rdev->sb_start = sb_start; |
0cd17fec | 1855 | } |
65a06f06 | 1856 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1857 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1858 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1859 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1860 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1861 | rdev->sb_page); |
1862 | md_super_wait(rdev->mddev); | |
c26a44ed | 1863 | return num_sectors; |
0cd17fec | 1864 | } |
1da177e4 | 1865 | |
75c96f85 | 1866 | static struct super_type super_types[] = { |
1da177e4 LT |
1867 | [0] = { |
1868 | .name = "0.90.0", | |
1869 | .owner = THIS_MODULE, | |
0cd17fec CW |
1870 | .load_super = super_90_load, |
1871 | .validate_super = super_90_validate, | |
1872 | .sync_super = super_90_sync, | |
1873 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1874 | }, |
1875 | [1] = { | |
1876 | .name = "md-1", | |
1877 | .owner = THIS_MODULE, | |
0cd17fec CW |
1878 | .load_super = super_1_load, |
1879 | .validate_super = super_1_validate, | |
1880 | .sync_super = super_1_sync, | |
1881 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1882 | }, |
1883 | }; | |
1da177e4 | 1884 | |
076f968b JB |
1885 | static void sync_super(mddev_t *mddev, mdk_rdev_t *rdev) |
1886 | { | |
1887 | if (mddev->sync_super) { | |
1888 | mddev->sync_super(mddev, rdev); | |
1889 | return; | |
1890 | } | |
1891 | ||
1892 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1893 | ||
1894 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1895 | } | |
1896 | ||
1da177e4 LT |
1897 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) |
1898 | { | |
7dd5e7c3 | 1899 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1900 | |
4b80991c N |
1901 | rcu_read_lock(); |
1902 | rdev_for_each_rcu(rdev, mddev1) | |
1903 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1904 | if (rdev->bdev->bd_contains == |
4b80991c N |
1905 | rdev2->bdev->bd_contains) { |
1906 | rcu_read_unlock(); | |
7dd5e7c3 | 1907 | return 1; |
4b80991c N |
1908 | } |
1909 | rcu_read_unlock(); | |
1da177e4 LT |
1910 | return 0; |
1911 | } | |
1912 | ||
1913 | static LIST_HEAD(pending_raid_disks); | |
1914 | ||
ac5e7113 AN |
1915 | /* |
1916 | * Try to register data integrity profile for an mddev | |
1917 | * | |
1918 | * This is called when an array is started and after a disk has been kicked | |
1919 | * from the array. It only succeeds if all working and active component devices | |
1920 | * are integrity capable with matching profiles. | |
1921 | */ | |
1922 | int md_integrity_register(mddev_t *mddev) | |
1923 | { | |
1924 | mdk_rdev_t *rdev, *reference = NULL; | |
1925 | ||
1926 | if (list_empty(&mddev->disks)) | |
1927 | return 0; /* nothing to do */ | |
629acb6a JB |
1928 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1929 | return 0; /* shouldn't register, or already is */ | |
ac5e7113 AN |
1930 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1931 | /* skip spares and non-functional disks */ | |
1932 | if (test_bit(Faulty, &rdev->flags)) | |
1933 | continue; | |
1934 | if (rdev->raid_disk < 0) | |
1935 | continue; | |
ac5e7113 AN |
1936 | if (!reference) { |
1937 | /* Use the first rdev as the reference */ | |
1938 | reference = rdev; | |
1939 | continue; | |
1940 | } | |
1941 | /* does this rdev's profile match the reference profile? */ | |
1942 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1943 | rdev->bdev->bd_disk) < 0) | |
1944 | return -EINVAL; | |
1945 | } | |
89078d57 MP |
1946 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1947 | return 0; | |
ac5e7113 AN |
1948 | /* |
1949 | * All component devices are integrity capable and have matching | |
1950 | * profiles, register the common profile for the md device. | |
1951 | */ | |
1952 | if (blk_integrity_register(mddev->gendisk, | |
1953 | bdev_get_integrity(reference->bdev)) != 0) { | |
1954 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1955 | mdname(mddev)); | |
1956 | return -EINVAL; | |
1957 | } | |
a91a2785 MP |
1958 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
1959 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
1960 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
1961 | mdname(mddev)); | |
1962 | return -EINVAL; | |
1963 | } | |
ac5e7113 AN |
1964 | return 0; |
1965 | } | |
1966 | EXPORT_SYMBOL(md_integrity_register); | |
1967 | ||
1968 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1969 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1970 | { |
3f9d99c1 | 1971 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1972 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1973 | |
ac5e7113 | 1974 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1975 | return; |
ac5e7113 | 1976 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1977 | return; |
ac5e7113 AN |
1978 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1979 | rdev->bdev->bd_disk) >= 0) | |
1980 | return; | |
1981 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1982 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1983 | } |
ac5e7113 | 1984 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1985 | |
1da177e4 LT |
1986 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1987 | { | |
7dd5e7c3 | 1988 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1989 | struct kobject *ko; |
1edf80d3 | 1990 | char *s; |
5e55e2f5 | 1991 | int err; |
1da177e4 LT |
1992 | |
1993 | if (rdev->mddev) { | |
1994 | MD_BUG(); | |
1995 | return -EINVAL; | |
1996 | } | |
11e2ede0 DW |
1997 | |
1998 | /* prevent duplicates */ | |
1999 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
2000 | return -EEXIST; | |
2001 | ||
dd8ac336 AN |
2002 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
2003 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
2004 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
2005 | if (mddev->pers) { |
2006 | /* Cannot change size, so fail | |
2007 | * If mddev->level <= 0, then we don't care | |
2008 | * about aligning sizes (e.g. linear) | |
2009 | */ | |
2010 | if (mddev->level > 0) | |
2011 | return -ENOSPC; | |
2012 | } else | |
dd8ac336 | 2013 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 2014 | } |
1da177e4 LT |
2015 | |
2016 | /* Verify rdev->desc_nr is unique. | |
2017 | * If it is -1, assign a free number, else | |
2018 | * check number is not in use | |
2019 | */ | |
2020 | if (rdev->desc_nr < 0) { | |
2021 | int choice = 0; | |
2022 | if (mddev->pers) choice = mddev->raid_disks; | |
2023 | while (find_rdev_nr(mddev, choice)) | |
2024 | choice++; | |
2025 | rdev->desc_nr = choice; | |
2026 | } else { | |
2027 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
2028 | return -EBUSY; | |
2029 | } | |
de01dfad N |
2030 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
2031 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
2032 | mdname(mddev), mddev->max_disks); | |
2033 | return -EBUSY; | |
2034 | } | |
19133a42 | 2035 | bdevname(rdev->bdev,b); |
649316b2 | 2036 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 2037 | *s = '!'; |
649316b2 | 2038 | |
1da177e4 | 2039 | rdev->mddev = mddev; |
19133a42 | 2040 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 2041 | |
b2d6db58 | 2042 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 2043 | goto fail; |
86e6ffdd | 2044 | |
0762b8bd | 2045 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
2046 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
2047 | /* failure here is OK */; | |
2048 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 2049 | |
4b80991c | 2050 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2051 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2052 | |
2053 | /* May as well allow recovery to be retried once */ | |
5389042f | 2054 | mddev->recovery_disabled++; |
3f9d99c1 | 2055 | |
1da177e4 | 2056 | return 0; |
5e55e2f5 N |
2057 | |
2058 | fail: | |
2059 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2060 | b, mdname(mddev)); | |
2061 | return err; | |
1da177e4 LT |
2062 | } |
2063 | ||
177a99b2 | 2064 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
2065 | { |
2066 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
2067 | kobject_del(&rdev->kobj); | |
177a99b2 | 2068 | kobject_put(&rdev->kobj); |
5792a285 N |
2069 | } |
2070 | ||
1da177e4 LT |
2071 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
2072 | { | |
2073 | char b[BDEVNAME_SIZE]; | |
2074 | if (!rdev->mddev) { | |
2075 | MD_BUG(); | |
2076 | return; | |
2077 | } | |
49731baa | 2078 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2079 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2080 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2081 | rdev->mddev = NULL; | |
86e6ffdd | 2082 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2083 | sysfs_put(rdev->sysfs_state); |
2084 | rdev->sysfs_state = NULL; | |
2230dfe4 N |
2085 | kfree(rdev->badblocks.page); |
2086 | rdev->badblocks.count = 0; | |
2087 | rdev->badblocks.page = NULL; | |
5792a285 | 2088 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2089 | * writing to 'remove' to "dev/state". We also need |
2090 | * to delay it due to rcu usage. | |
5792a285 | 2091 | */ |
4b80991c | 2092 | synchronize_rcu(); |
177a99b2 N |
2093 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2094 | kobject_get(&rdev->kobj); | |
e804ac78 | 2095 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2096 | } |
2097 | ||
2098 | /* | |
2099 | * prevent the device from being mounted, repartitioned or | |
2100 | * otherwise reused by a RAID array (or any other kernel | |
2101 | * subsystem), by bd_claiming the device. | |
2102 | */ | |
c5d79adb | 2103 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
2104 | { |
2105 | int err = 0; | |
2106 | struct block_device *bdev; | |
2107 | char b[BDEVNAME_SIZE]; | |
2108 | ||
d4d77629 TH |
2109 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
2110 | shared ? (mdk_rdev_t *)lock_rdev : rdev); | |
1da177e4 LT |
2111 | if (IS_ERR(bdev)) { |
2112 | printk(KERN_ERR "md: could not open %s.\n", | |
2113 | __bdevname(dev, b)); | |
2114 | return PTR_ERR(bdev); | |
2115 | } | |
1da177e4 LT |
2116 | rdev->bdev = bdev; |
2117 | return err; | |
2118 | } | |
2119 | ||
2120 | static void unlock_rdev(mdk_rdev_t *rdev) | |
2121 | { | |
2122 | struct block_device *bdev = rdev->bdev; | |
2123 | rdev->bdev = NULL; | |
2124 | if (!bdev) | |
2125 | MD_BUG(); | |
e525fd89 | 2126 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2127 | } |
2128 | ||
2129 | void md_autodetect_dev(dev_t dev); | |
2130 | ||
2131 | static void export_rdev(mdk_rdev_t * rdev) | |
2132 | { | |
2133 | char b[BDEVNAME_SIZE]; | |
2134 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
2135 | bdevname(rdev->bdev,b)); | |
2136 | if (rdev->mddev) | |
2137 | MD_BUG(); | |
2138 | free_disk_sb(rdev); | |
1da177e4 | 2139 | #ifndef MODULE |
d0fae18f N |
2140 | if (test_bit(AutoDetected, &rdev->flags)) |
2141 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2142 | #endif |
2143 | unlock_rdev(rdev); | |
86e6ffdd | 2144 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2145 | } |
2146 | ||
2147 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
2148 | { | |
2149 | unbind_rdev_from_array(rdev); | |
2150 | export_rdev(rdev); | |
2151 | } | |
2152 | ||
2153 | static void export_array(mddev_t *mddev) | |
2154 | { | |
159ec1fc | 2155 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 2156 | |
d089c6af | 2157 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2158 | if (!rdev->mddev) { |
2159 | MD_BUG(); | |
2160 | continue; | |
2161 | } | |
2162 | kick_rdev_from_array(rdev); | |
2163 | } | |
2164 | if (!list_empty(&mddev->disks)) | |
2165 | MD_BUG(); | |
2166 | mddev->raid_disks = 0; | |
2167 | mddev->major_version = 0; | |
2168 | } | |
2169 | ||
2170 | static void print_desc(mdp_disk_t *desc) | |
2171 | { | |
2172 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2173 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2174 | } | |
2175 | ||
cd2ac932 | 2176 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2177 | { |
2178 | int i; | |
2179 | ||
2180 | printk(KERN_INFO | |
2181 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2182 | sb->major_version, sb->minor_version, sb->patch_version, | |
2183 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2184 | sb->ctime); | |
2185 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2186 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2187 | sb->md_minor, sb->layout, sb->chunk_size); | |
2188 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2189 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2190 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2191 | sb->failed_disks, sb->spare_disks, | |
2192 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2193 | ||
2194 | printk(KERN_INFO); | |
2195 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2196 | mdp_disk_t *desc; | |
2197 | ||
2198 | desc = sb->disks + i; | |
2199 | if (desc->number || desc->major || desc->minor || | |
2200 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2201 | printk(" D %2d: ", i); | |
2202 | print_desc(desc); | |
2203 | } | |
2204 | } | |
2205 | printk(KERN_INFO "md: THIS: "); | |
2206 | print_desc(&sb->this_disk); | |
cd2ac932 | 2207 | } |
1da177e4 | 2208 | |
cd2ac932 CR |
2209 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2210 | { | |
2211 | __u8 *uuid; | |
2212 | ||
2213 | uuid = sb->set_uuid; | |
ad361c98 | 2214 | printk(KERN_INFO |
7b75c2f8 | 2215 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2216 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2217 | le32_to_cpu(sb->major_version), |
2218 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2219 | uuid, |
cd2ac932 CR |
2220 | sb->set_name, |
2221 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2222 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2223 | ||
2224 | uuid = sb->device_uuid; | |
ad361c98 JP |
2225 | printk(KERN_INFO |
2226 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2227 | " RO:%llu\n" |
7b75c2f8 | 2228 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2229 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2230 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2231 | le32_to_cpu(sb->level), |
2232 | (unsigned long long)le64_to_cpu(sb->size), | |
2233 | le32_to_cpu(sb->raid_disks), | |
2234 | le32_to_cpu(sb->layout), | |
2235 | le32_to_cpu(sb->chunksize), | |
2236 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2237 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2238 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2239 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2240 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2241 | uuid, |
cd2ac932 CR |
2242 | sb->devflags, |
2243 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2244 | (unsigned long long)le64_to_cpu(sb->events), | |
2245 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2246 | le32_to_cpu(sb->sb_csum), | |
2247 | le32_to_cpu(sb->max_dev) | |
2248 | ); | |
1da177e4 LT |
2249 | } |
2250 | ||
cd2ac932 | 2251 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
2252 | { |
2253 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2254 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2255 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2256 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2257 | rdev->desc_nr); | |
1da177e4 | 2258 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2259 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2260 | switch (major_version) { | |
2261 | case 0: | |
65a06f06 | 2262 | print_sb_90(page_address(rdev->sb_page)); |
cd2ac932 CR |
2263 | break; |
2264 | case 1: | |
65a06f06 | 2265 | print_sb_1(page_address(rdev->sb_page)); |
cd2ac932 CR |
2266 | break; |
2267 | } | |
1da177e4 LT |
2268 | } else |
2269 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2270 | } | |
2271 | ||
5e56341d | 2272 | static void md_print_devices(void) |
1da177e4 | 2273 | { |
159ec1fc | 2274 | struct list_head *tmp; |
1da177e4 LT |
2275 | mdk_rdev_t *rdev; |
2276 | mddev_t *mddev; | |
2277 | char b[BDEVNAME_SIZE]; | |
2278 | ||
2279 | printk("\n"); | |
2280 | printk("md: **********************************\n"); | |
2281 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2282 | printk("md: **********************************\n"); | |
29ac4aa3 | 2283 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2284 | |
32a7627c N |
2285 | if (mddev->bitmap) |
2286 | bitmap_print_sb(mddev->bitmap); | |
2287 | else | |
2288 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2289 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2290 | printk("<%s>", bdevname(rdev->bdev,b)); |
2291 | printk("\n"); | |
2292 | ||
159ec1fc | 2293 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2294 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2295 | } |
2296 | printk("md: **********************************\n"); | |
2297 | printk("\n"); | |
2298 | } | |
2299 | ||
2300 | ||
42543769 | 2301 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2302 | { |
42543769 N |
2303 | /* Update each superblock (in-memory image), but |
2304 | * if we are allowed to, skip spares which already | |
2305 | * have the right event counter, or have one earlier | |
2306 | * (which would mean they aren't being marked as dirty | |
2307 | * with the rest of the array) | |
2308 | */ | |
1da177e4 | 2309 | mdk_rdev_t *rdev; |
159ec1fc | 2310 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2311 | if (rdev->sb_events == mddev->events || |
2312 | (nospares && | |
2313 | rdev->raid_disk < 0 && | |
42543769 N |
2314 | rdev->sb_events+1 == mddev->events)) { |
2315 | /* Don't update this superblock */ | |
2316 | rdev->sb_loaded = 2; | |
2317 | } else { | |
076f968b | 2318 | sync_super(mddev, rdev); |
42543769 N |
2319 | rdev->sb_loaded = 1; |
2320 | } | |
1da177e4 LT |
2321 | } |
2322 | } | |
2323 | ||
850b2b42 | 2324 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2325 | { |
1da177e4 | 2326 | mdk_rdev_t *rdev; |
06d91a5f | 2327 | int sync_req; |
42543769 | 2328 | int nospares = 0; |
2699b672 | 2329 | int any_badblocks_changed = 0; |
1da177e4 | 2330 | |
1da177e4 | 2331 | repeat: |
3a3a5ddb N |
2332 | /* First make sure individual recovery_offsets are correct */ |
2333 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2334 | if (rdev->raid_disk >= 0 && | |
2335 | mddev->delta_disks >= 0 && | |
2336 | !test_bit(In_sync, &rdev->flags) && | |
2337 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2338 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2339 | ||
2340 | } | |
bd52b746 | 2341 | if (!mddev->persistent) { |
070dc6dd | 2342 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2343 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
d97a41dc N |
2344 | if (!mddev->external) |
2345 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3a3a5ddb N |
2346 | wake_up(&mddev->sb_wait); |
2347 | return; | |
2348 | } | |
2349 | ||
a9701a30 | 2350 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2351 | |
3a3a5ddb N |
2352 | mddev->utime = get_seconds(); |
2353 | ||
850b2b42 N |
2354 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2355 | force_change = 1; | |
2356 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2357 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2358 | * though if events isn't the right even/odd, we will have to do | |
2359 | * spares after all | |
2360 | */ | |
2361 | nospares = 1; | |
2362 | if (force_change) | |
2363 | nospares = 0; | |
2364 | if (mddev->degraded) | |
84692195 N |
2365 | /* If the array is degraded, then skipping spares is both |
2366 | * dangerous and fairly pointless. | |
2367 | * Dangerous because a device that was removed from the array | |
2368 | * might have a event_count that still looks up-to-date, | |
2369 | * so it can be re-added without a resync. | |
2370 | * Pointless because if there are any spares to skip, | |
2371 | * then a recovery will happen and soon that array won't | |
2372 | * be degraded any more and the spare can go back to sleep then. | |
2373 | */ | |
850b2b42 | 2374 | nospares = 0; |
84692195 | 2375 | |
06d91a5f | 2376 | sync_req = mddev->in_sync; |
42543769 N |
2377 | |
2378 | /* If this is just a dirty<->clean transition, and the array is clean | |
2379 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2380 | if (nospares |
42543769 | 2381 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2382 | && mddev->can_decrease_events |
2383 | && mddev->events != 1) { | |
42543769 | 2384 | mddev->events--; |
a8707c08 N |
2385 | mddev->can_decrease_events = 0; |
2386 | } else { | |
42543769 N |
2387 | /* otherwise we have to go forward and ... */ |
2388 | mddev->events ++; | |
a8707c08 | 2389 | mddev->can_decrease_events = nospares; |
42543769 | 2390 | } |
1da177e4 LT |
2391 | |
2392 | if (!mddev->events) { | |
2393 | /* | |
2394 | * oops, this 64-bit counter should never wrap. | |
2395 | * Either we are in around ~1 trillion A.C., assuming | |
2396 | * 1 reboot per second, or we have a bug: | |
2397 | */ | |
2398 | MD_BUG(); | |
2399 | mddev->events --; | |
2400 | } | |
2699b672 N |
2401 | |
2402 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
2403 | if (rdev->badblocks.changed) | |
2404 | any_badblocks_changed++; | |
2405 | ||
e691063a | 2406 | sync_sbs(mddev, nospares); |
a9701a30 | 2407 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2408 | |
2409 | dprintk(KERN_INFO | |
2410 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2411 | mdname(mddev),mddev->in_sync); | |
2412 | ||
4ad13663 | 2413 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2414 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2415 | char b[BDEVNAME_SIZE]; |
2416 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2417 | if (rdev->sb_loaded != 1) |
2418 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2419 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2420 | dprintk("(skipping faulty "); |
2421 | ||
2422 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2423 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2424 | md_super_write(mddev,rdev, |
0f420358 | 2425 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2426 | rdev->sb_page); |
2427 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2428 | bdevname(rdev->bdev,b), | |
0f420358 | 2429 | (unsigned long long)rdev->sb_start); |
42543769 | 2430 | rdev->sb_events = mddev->events; |
2699b672 N |
2431 | if (rdev->badblocks.size) { |
2432 | md_super_write(mddev, rdev, | |
2433 | rdev->badblocks.sector, | |
2434 | rdev->badblocks.size << 9, | |
2435 | rdev->bb_page); | |
2436 | rdev->badblocks.size = 0; | |
2437 | } | |
7bfa19f2 | 2438 | |
1da177e4 LT |
2439 | } else |
2440 | dprintk(")\n"); | |
7bfa19f2 | 2441 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2442 | /* only need to write one superblock... */ |
2443 | break; | |
2444 | } | |
a9701a30 | 2445 | md_super_wait(mddev); |
850b2b42 | 2446 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2447 | |
a9701a30 | 2448 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2449 | if (mddev->in_sync != sync_req || |
2450 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2451 | /* have to write it out again */ |
a9701a30 | 2452 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2453 | goto repeat; |
2454 | } | |
850b2b42 | 2455 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2456 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2457 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2458 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2459 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2460 | |
2699b672 N |
2461 | if (any_badblocks_changed) |
2462 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
2463 | md_ack_all_badblocks(&rdev->badblocks); | |
1da177e4 LT |
2464 | } |
2465 | ||
7f6ce769 | 2466 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2467 | * We want to accept with case. For this we use cmd_match. |
2468 | */ | |
2469 | static int cmd_match(const char *cmd, const char *str) | |
2470 | { | |
2471 | /* See if cmd, written into a sysfs file, matches | |
2472 | * str. They must either be the same, or cmd can | |
2473 | * have a trailing newline | |
2474 | */ | |
2475 | while (*cmd && *str && *cmd == *str) { | |
2476 | cmd++; | |
2477 | str++; | |
2478 | } | |
2479 | if (*cmd == '\n') | |
2480 | cmd++; | |
2481 | if (*str || *cmd) | |
2482 | return 0; | |
2483 | return 1; | |
2484 | } | |
2485 | ||
86e6ffdd N |
2486 | struct rdev_sysfs_entry { |
2487 | struct attribute attr; | |
2488 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2489 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2490 | }; | |
2491 | ||
2492 | static ssize_t | |
96de1e66 | 2493 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2494 | { |
2495 | char *sep = ""; | |
20a49ff6 | 2496 | size_t len = 0; |
86e6ffdd | 2497 | |
b2d444d7 | 2498 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2499 | len+= sprintf(page+len, "%sfaulty",sep); |
2500 | sep = ","; | |
2501 | } | |
b2d444d7 | 2502 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2503 | len += sprintf(page+len, "%sin_sync",sep); |
2504 | sep = ","; | |
2505 | } | |
f655675b N |
2506 | if (test_bit(WriteMostly, &rdev->flags)) { |
2507 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2508 | sep = ","; | |
2509 | } | |
6bfe0b49 DW |
2510 | if (test_bit(Blocked, &rdev->flags)) { |
2511 | len += sprintf(page+len, "%sblocked", sep); | |
2512 | sep = ","; | |
2513 | } | |
b2d444d7 N |
2514 | if (!test_bit(Faulty, &rdev->flags) && |
2515 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2516 | len += sprintf(page+len, "%sspare", sep); |
2517 | sep = ","; | |
2518 | } | |
d7a9d443 N |
2519 | if (test_bit(WriteErrorSeen, &rdev->flags)) { |
2520 | len += sprintf(page+len, "%swrite_error", sep); | |
2521 | sep = ","; | |
2522 | } | |
86e6ffdd N |
2523 | return len+sprintf(page+len, "\n"); |
2524 | } | |
2525 | ||
45dc2de1 N |
2526 | static ssize_t |
2527 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2528 | { | |
2529 | /* can write | |
2530 | * faulty - simulates and error | |
2531 | * remove - disconnects the device | |
f655675b N |
2532 | * writemostly - sets write_mostly |
2533 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2534 | * blocked - sets the Blocked flag |
2535 | * -blocked - clears the Blocked flag | |
6d56e278 | 2536 | * insync - sets Insync providing device isn't active |
d7a9d443 N |
2537 | * write_error - sets WriteErrorSeen |
2538 | * -write_error - clears WriteErrorSeen | |
45dc2de1 N |
2539 | */ |
2540 | int err = -EINVAL; | |
2541 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2542 | md_error(rdev->mddev, rdev); | |
2543 | err = 0; | |
2544 | } else if (cmd_match(buf, "remove")) { | |
2545 | if (rdev->raid_disk >= 0) | |
2546 | err = -EBUSY; | |
2547 | else { | |
2548 | mddev_t *mddev = rdev->mddev; | |
2549 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2550 | if (mddev->pers) |
2551 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2552 | md_new_event(mddev); |
2553 | err = 0; | |
2554 | } | |
f655675b N |
2555 | } else if (cmd_match(buf, "writemostly")) { |
2556 | set_bit(WriteMostly, &rdev->flags); | |
2557 | err = 0; | |
2558 | } else if (cmd_match(buf, "-writemostly")) { | |
2559 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2560 | err = 0; |
2561 | } else if (cmd_match(buf, "blocked")) { | |
2562 | set_bit(Blocked, &rdev->flags); | |
2563 | err = 0; | |
2564 | } else if (cmd_match(buf, "-blocked")) { | |
2565 | clear_bit(Blocked, &rdev->flags); | |
2566 | wake_up(&rdev->blocked_wait); | |
2567 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2568 | md_wakeup_thread(rdev->mddev->thread); | |
2569 | ||
6d56e278 N |
2570 | err = 0; |
2571 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2572 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2573 | err = 0; |
d7a9d443 N |
2574 | } else if (cmd_match(buf, "write_error")) { |
2575 | set_bit(WriteErrorSeen, &rdev->flags); | |
2576 | err = 0; | |
2577 | } else if (cmd_match(buf, "-write_error")) { | |
2578 | clear_bit(WriteErrorSeen, &rdev->flags); | |
2579 | err = 0; | |
45dc2de1 | 2580 | } |
00bcb4ac N |
2581 | if (!err) |
2582 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2583 | return err ? err : len; |
2584 | } | |
80ca3a44 N |
2585 | static struct rdev_sysfs_entry rdev_state = |
2586 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2587 | |
4dbcdc75 N |
2588 | static ssize_t |
2589 | errors_show(mdk_rdev_t *rdev, char *page) | |
2590 | { | |
2591 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2592 | } | |
2593 | ||
2594 | static ssize_t | |
2595 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2596 | { | |
2597 | char *e; | |
2598 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2599 | if (*buf && (*e == 0 || *e == '\n')) { | |
2600 | atomic_set(&rdev->corrected_errors, n); | |
2601 | return len; | |
2602 | } | |
2603 | return -EINVAL; | |
2604 | } | |
2605 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2606 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2607 | |
014236d2 N |
2608 | static ssize_t |
2609 | slot_show(mdk_rdev_t *rdev, char *page) | |
2610 | { | |
2611 | if (rdev->raid_disk < 0) | |
2612 | return sprintf(page, "none\n"); | |
2613 | else | |
2614 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2615 | } | |
2616 | ||
2617 | static ssize_t | |
2618 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2619 | { | |
2620 | char *e; | |
c303da6d | 2621 | int err; |
014236d2 N |
2622 | int slot = simple_strtoul(buf, &e, 10); |
2623 | if (strncmp(buf, "none", 4)==0) | |
2624 | slot = -1; | |
2625 | else if (e==buf || (*e && *e!= '\n')) | |
2626 | return -EINVAL; | |
6c2fce2e | 2627 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2628 | /* Setting 'slot' on an active array requires also |
2629 | * updating the 'rd%d' link, and communicating | |
2630 | * with the personality with ->hot_*_disk. | |
2631 | * For now we only support removing | |
2632 | * failed/spare devices. This normally happens automatically, | |
2633 | * but not when the metadata is externally managed. | |
2634 | */ | |
c303da6d N |
2635 | if (rdev->raid_disk == -1) |
2636 | return -EEXIST; | |
2637 | /* personality does all needed checks */ | |
01393f3d | 2638 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d N |
2639 | return -EINVAL; |
2640 | err = rdev->mddev->pers-> | |
2641 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2642 | if (err) | |
2643 | return err; | |
36fad858 | 2644 | sysfs_unlink_rdev(rdev->mddev, rdev); |
b7103107 | 2645 | rdev->raid_disk = -1; |
c303da6d N |
2646 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2647 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2648 | } else if (rdev->mddev->pers) { |
2649 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2650 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2651 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2652 | */ |
2653 | ||
2654 | if (rdev->raid_disk != -1) | |
2655 | return -EBUSY; | |
2656 | ||
c6751b2b N |
2657 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2658 | return -EBUSY; | |
2659 | ||
6c2fce2e NB |
2660 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2661 | return -EINVAL; | |
2662 | ||
159ec1fc | 2663 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2664 | if (rdev2->raid_disk == slot) |
2665 | return -EEXIST; | |
2666 | ||
ba1b41b6 N |
2667 | if (slot >= rdev->mddev->raid_disks && |
2668 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2669 | return -ENOSPC; | |
2670 | ||
6c2fce2e NB |
2671 | rdev->raid_disk = slot; |
2672 | if (test_bit(In_sync, &rdev->flags)) | |
2673 | rdev->saved_raid_disk = slot; | |
2674 | else | |
2675 | rdev->saved_raid_disk = -1; | |
2676 | err = rdev->mddev->pers-> | |
2677 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2678 | if (err) { |
6c2fce2e | 2679 | rdev->raid_disk = -1; |
6c2fce2e | 2680 | return err; |
52664732 | 2681 | } else |
00bcb4ac | 2682 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2683 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2684 | /* failure here is OK */; |
6c2fce2e | 2685 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2686 | } else { |
ba1b41b6 N |
2687 | if (slot >= rdev->mddev->raid_disks && |
2688 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2689 | return -ENOSPC; |
2690 | rdev->raid_disk = slot; | |
2691 | /* assume it is working */ | |
c5d79adb N |
2692 | clear_bit(Faulty, &rdev->flags); |
2693 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2694 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2695 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2696 | } |
014236d2 N |
2697 | return len; |
2698 | } | |
2699 | ||
2700 | ||
2701 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2702 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2703 | |
93c8cad0 N |
2704 | static ssize_t |
2705 | offset_show(mdk_rdev_t *rdev, char *page) | |
2706 | { | |
6961ece4 | 2707 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2708 | } |
2709 | ||
2710 | static ssize_t | |
2711 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2712 | { | |
2713 | char *e; | |
2714 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2715 | if (e==buf || (*e && *e != '\n')) | |
2716 | return -EINVAL; | |
8ed0a521 | 2717 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2718 | return -EBUSY; |
dd8ac336 | 2719 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2720 | /* Must set offset before size, so overlap checks |
2721 | * can be sane */ | |
2722 | return -EBUSY; | |
93c8cad0 N |
2723 | rdev->data_offset = offset; |
2724 | return len; | |
2725 | } | |
2726 | ||
2727 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2728 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2729 | |
83303b61 N |
2730 | static ssize_t |
2731 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2732 | { | |
dd8ac336 | 2733 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2734 | } |
2735 | ||
c5d79adb N |
2736 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2737 | { | |
2738 | /* check if two start/length pairs overlap */ | |
2739 | if (s1+l1 <= s2) | |
2740 | return 0; | |
2741 | if (s2+l2 <= s1) | |
2742 | return 0; | |
2743 | return 1; | |
2744 | } | |
2745 | ||
b522adcd DW |
2746 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2747 | { | |
2748 | unsigned long long blocks; | |
2749 | sector_t new; | |
2750 | ||
2751 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2752 | return -EINVAL; | |
2753 | ||
2754 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2755 | return -EINVAL; /* sector conversion overflow */ | |
2756 | ||
2757 | new = blocks * 2; | |
2758 | if (new != blocks * 2) | |
2759 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2760 | ||
2761 | *sectors = new; | |
2762 | return 0; | |
2763 | } | |
2764 | ||
83303b61 N |
2765 | static ssize_t |
2766 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2767 | { | |
27c529bb | 2768 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2769 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2770 | sector_t sectors; |
27c529bb | 2771 | |
b522adcd | 2772 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2773 | return -EINVAL; |
0cd17fec | 2774 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2775 | if (my_mddev->persistent) { |
dd8ac336 AN |
2776 | sectors = super_types[my_mddev->major_version]. |
2777 | rdev_size_change(rdev, sectors); | |
2778 | if (!sectors) | |
0cd17fec | 2779 | return -EBUSY; |
dd8ac336 | 2780 | } else if (!sectors) |
77304d2a | 2781 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2782 | rdev->data_offset; |
0cd17fec | 2783 | } |
dd8ac336 | 2784 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2785 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2786 | |
dd8ac336 AN |
2787 | rdev->sectors = sectors; |
2788 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2789 | /* need to check that all other rdevs with the same ->bdev |
2790 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2791 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2792 | * we have to change it back, we will have the lock again. |
2793 | */ | |
2794 | mddev_t *mddev; | |
2795 | int overlap = 0; | |
159ec1fc | 2796 | struct list_head *tmp; |
c5d79adb | 2797 | |
27c529bb | 2798 | mddev_unlock(my_mddev); |
29ac4aa3 | 2799 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2800 | mdk_rdev_t *rdev2; |
2801 | ||
2802 | mddev_lock(mddev); | |
159ec1fc | 2803 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
f21e9ff7 N |
2804 | if (rdev->bdev == rdev2->bdev && |
2805 | rdev != rdev2 && | |
2806 | overlaps(rdev->data_offset, rdev->sectors, | |
2807 | rdev2->data_offset, | |
2808 | rdev2->sectors)) { | |
c5d79adb N |
2809 | overlap = 1; |
2810 | break; | |
2811 | } | |
2812 | mddev_unlock(mddev); | |
2813 | if (overlap) { | |
2814 | mddev_put(mddev); | |
2815 | break; | |
2816 | } | |
2817 | } | |
27c529bb | 2818 | mddev_lock(my_mddev); |
c5d79adb N |
2819 | if (overlap) { |
2820 | /* Someone else could have slipped in a size | |
2821 | * change here, but doing so is just silly. | |
dd8ac336 | 2822 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2823 | * safe, and trust userspace not to race with |
2824 | * itself | |
2825 | */ | |
dd8ac336 | 2826 | rdev->sectors = oldsectors; |
c5d79adb N |
2827 | return -EBUSY; |
2828 | } | |
2829 | } | |
83303b61 N |
2830 | return len; |
2831 | } | |
2832 | ||
2833 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2834 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2835 | |
06e3c817 DW |
2836 | |
2837 | static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page) | |
2838 | { | |
2839 | unsigned long long recovery_start = rdev->recovery_offset; | |
2840 | ||
2841 | if (test_bit(In_sync, &rdev->flags) || | |
2842 | recovery_start == MaxSector) | |
2843 | return sprintf(page, "none\n"); | |
2844 | ||
2845 | return sprintf(page, "%llu\n", recovery_start); | |
2846 | } | |
2847 | ||
2848 | static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2849 | { | |
2850 | unsigned long long recovery_start; | |
2851 | ||
2852 | if (cmd_match(buf, "none")) | |
2853 | recovery_start = MaxSector; | |
2854 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2855 | return -EINVAL; | |
2856 | ||
2857 | if (rdev->mddev->pers && | |
2858 | rdev->raid_disk >= 0) | |
2859 | return -EBUSY; | |
2860 | ||
2861 | rdev->recovery_offset = recovery_start; | |
2862 | if (recovery_start == MaxSector) | |
2863 | set_bit(In_sync, &rdev->flags); | |
2864 | else | |
2865 | clear_bit(In_sync, &rdev->flags); | |
2866 | return len; | |
2867 | } | |
2868 | ||
2869 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2870 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2871 | ||
16c791a5 N |
2872 | |
2873 | static ssize_t | |
2874 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2875 | static ssize_t | |
2876 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2877 | ||
2878 | static ssize_t bb_show(mdk_rdev_t *rdev, char *page) | |
2879 | { | |
2880 | return badblocks_show(&rdev->badblocks, page, 0); | |
2881 | } | |
2882 | static ssize_t bb_store(mdk_rdev_t *rdev, const char *page, size_t len) | |
2883 | { | |
2884 | return badblocks_store(&rdev->badblocks, page, len, 0); | |
2885 | } | |
2886 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2887 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2888 | ||
2889 | ||
2890 | static ssize_t ubb_show(mdk_rdev_t *rdev, char *page) | |
2891 | { | |
2892 | return badblocks_show(&rdev->badblocks, page, 1); | |
2893 | } | |
2894 | static ssize_t ubb_store(mdk_rdev_t *rdev, const char *page, size_t len) | |
2895 | { | |
2896 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2897 | } | |
2898 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
2899 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
2900 | ||
86e6ffdd N |
2901 | static struct attribute *rdev_default_attrs[] = { |
2902 | &rdev_state.attr, | |
4dbcdc75 | 2903 | &rdev_errors.attr, |
014236d2 | 2904 | &rdev_slot.attr, |
93c8cad0 | 2905 | &rdev_offset.attr, |
83303b61 | 2906 | &rdev_size.attr, |
06e3c817 | 2907 | &rdev_recovery_start.attr, |
16c791a5 N |
2908 | &rdev_bad_blocks.attr, |
2909 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
2910 | NULL, |
2911 | }; | |
2912 | static ssize_t | |
2913 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2914 | { | |
2915 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2916 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2917 | mddev_t *mddev = rdev->mddev; |
2918 | ssize_t rv; | |
86e6ffdd N |
2919 | |
2920 | if (!entry->show) | |
2921 | return -EIO; | |
27c529bb N |
2922 | |
2923 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2924 | if (!rv) { | |
2925 | if (rdev->mddev == NULL) | |
2926 | rv = -EBUSY; | |
2927 | else | |
2928 | rv = entry->show(rdev, page); | |
2929 | mddev_unlock(mddev); | |
2930 | } | |
2931 | return rv; | |
86e6ffdd N |
2932 | } |
2933 | ||
2934 | static ssize_t | |
2935 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2936 | const char *page, size_t length) | |
2937 | { | |
2938 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2939 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2940 | ssize_t rv; |
2941 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2942 | |
2943 | if (!entry->store) | |
2944 | return -EIO; | |
67463acb N |
2945 | if (!capable(CAP_SYS_ADMIN)) |
2946 | return -EACCES; | |
27c529bb | 2947 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2948 | if (!rv) { |
27c529bb N |
2949 | if (rdev->mddev == NULL) |
2950 | rv = -EBUSY; | |
2951 | else | |
2952 | rv = entry->store(rdev, page, length); | |
6a51830e | 2953 | mddev_unlock(mddev); |
ca388059 N |
2954 | } |
2955 | return rv; | |
86e6ffdd N |
2956 | } |
2957 | ||
2958 | static void rdev_free(struct kobject *ko) | |
2959 | { | |
2960 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2961 | kfree(rdev); | |
2962 | } | |
52cf25d0 | 2963 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2964 | .show = rdev_attr_show, |
2965 | .store = rdev_attr_store, | |
2966 | }; | |
2967 | static struct kobj_type rdev_ktype = { | |
2968 | .release = rdev_free, | |
2969 | .sysfs_ops = &rdev_sysfs_ops, | |
2970 | .default_attrs = rdev_default_attrs, | |
2971 | }; | |
2972 | ||
2230dfe4 | 2973 | int md_rdev_init(mdk_rdev_t *rdev) |
e8bb9a83 N |
2974 | { |
2975 | rdev->desc_nr = -1; | |
2976 | rdev->saved_raid_disk = -1; | |
2977 | rdev->raid_disk = -1; | |
2978 | rdev->flags = 0; | |
2979 | rdev->data_offset = 0; | |
2980 | rdev->sb_events = 0; | |
2981 | rdev->last_read_error.tv_sec = 0; | |
2982 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
2983 | rdev->sb_loaded = 0; |
2984 | rdev->bb_page = NULL; | |
e8bb9a83 N |
2985 | atomic_set(&rdev->nr_pending, 0); |
2986 | atomic_set(&rdev->read_errors, 0); | |
2987 | atomic_set(&rdev->corrected_errors, 0); | |
2988 | ||
2989 | INIT_LIST_HEAD(&rdev->same_set); | |
2990 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
2991 | |
2992 | /* Add space to store bad block list. | |
2993 | * This reserves the space even on arrays where it cannot | |
2994 | * be used - I wonder if that matters | |
2995 | */ | |
2996 | rdev->badblocks.count = 0; | |
2997 | rdev->badblocks.shift = 0; | |
2998 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
2999 | seqlock_init(&rdev->badblocks.lock); | |
3000 | if (rdev->badblocks.page == NULL) | |
3001 | return -ENOMEM; | |
3002 | ||
3003 | return 0; | |
e8bb9a83 N |
3004 | } |
3005 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
3006 | /* |
3007 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
3008 | * | |
3009 | * mark the device faulty if: | |
3010 | * | |
3011 | * - the device is nonexistent (zero size) | |
3012 | * - the device has no valid superblock | |
3013 | * | |
3014 | * a faulty rdev _never_ has rdev->sb set. | |
3015 | */ | |
3016 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
3017 | { | |
3018 | char b[BDEVNAME_SIZE]; | |
3019 | int err; | |
3020 | mdk_rdev_t *rdev; | |
3021 | sector_t size; | |
3022 | ||
9ffae0cf | 3023 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
3024 | if (!rdev) { |
3025 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
3026 | return ERR_PTR(-ENOMEM); | |
3027 | } | |
1da177e4 | 3028 | |
2230dfe4 N |
3029 | err = md_rdev_init(rdev); |
3030 | if (err) | |
3031 | goto abort_free; | |
3032 | err = alloc_disk_sb(rdev); | |
3033 | if (err) | |
1da177e4 LT |
3034 | goto abort_free; |
3035 | ||
c5d79adb | 3036 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
3037 | if (err) |
3038 | goto abort_free; | |
3039 | ||
f9cb074b | 3040 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 3041 | |
77304d2a | 3042 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 LT |
3043 | if (!size) { |
3044 | printk(KERN_WARNING | |
3045 | "md: %s has zero or unknown size, marking faulty!\n", | |
3046 | bdevname(rdev->bdev,b)); | |
3047 | err = -EINVAL; | |
3048 | goto abort_free; | |
3049 | } | |
3050 | ||
3051 | if (super_format >= 0) { | |
3052 | err = super_types[super_format]. | |
3053 | load_super(rdev, NULL, super_minor); | |
3054 | if (err == -EINVAL) { | |
df968c4e N |
3055 | printk(KERN_WARNING |
3056 | "md: %s does not have a valid v%d.%d " | |
3057 | "superblock, not importing!\n", | |
3058 | bdevname(rdev->bdev,b), | |
3059 | super_format, super_minor); | |
1da177e4 LT |
3060 | goto abort_free; |
3061 | } | |
3062 | if (err < 0) { | |
3063 | printk(KERN_WARNING | |
3064 | "md: could not read %s's sb, not importing!\n", | |
3065 | bdevname(rdev->bdev,b)); | |
3066 | goto abort_free; | |
3067 | } | |
3068 | } | |
9f2f3830 N |
3069 | if (super_format == -1) |
3070 | /* hot-add for 0.90, or non-persistent: so no badblocks */ | |
3071 | rdev->badblocks.shift = -1; | |
6bfe0b49 | 3072 | |
1da177e4 LT |
3073 | return rdev; |
3074 | ||
3075 | abort_free: | |
2699b672 N |
3076 | if (rdev->bdev) |
3077 | unlock_rdev(rdev); | |
3078 | free_disk_sb(rdev); | |
2230dfe4 | 3079 | kfree(rdev->badblocks.page); |
1da177e4 LT |
3080 | kfree(rdev); |
3081 | return ERR_PTR(err); | |
3082 | } | |
3083 | ||
3084 | /* | |
3085 | * Check a full RAID array for plausibility | |
3086 | */ | |
3087 | ||
3088 | ||
a757e64c | 3089 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
3090 | { |
3091 | int i; | |
159ec1fc | 3092 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
3093 | char b[BDEVNAME_SIZE]; |
3094 | ||
3095 | freshest = NULL; | |
d089c6af | 3096 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
3097 | switch (super_types[mddev->major_version]. |
3098 | load_super(rdev, freshest, mddev->minor_version)) { | |
3099 | case 1: | |
3100 | freshest = rdev; | |
3101 | break; | |
3102 | case 0: | |
3103 | break; | |
3104 | default: | |
3105 | printk( KERN_ERR \ | |
3106 | "md: fatal superblock inconsistency in %s" | |
3107 | " -- removing from array\n", | |
3108 | bdevname(rdev->bdev,b)); | |
3109 | kick_rdev_from_array(rdev); | |
3110 | } | |
3111 | ||
3112 | ||
3113 | super_types[mddev->major_version]. | |
3114 | validate_super(mddev, freshest); | |
3115 | ||
3116 | i = 0; | |
d089c6af | 3117 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
3118 | if (mddev->max_disks && |
3119 | (rdev->desc_nr >= mddev->max_disks || | |
3120 | i > mddev->max_disks)) { | |
de01dfad N |
3121 | printk(KERN_WARNING |
3122 | "md: %s: %s: only %d devices permitted\n", | |
3123 | mdname(mddev), bdevname(rdev->bdev, b), | |
3124 | mddev->max_disks); | |
3125 | kick_rdev_from_array(rdev); | |
3126 | continue; | |
3127 | } | |
1da177e4 LT |
3128 | if (rdev != freshest) |
3129 | if (super_types[mddev->major_version]. | |
3130 | validate_super(mddev, rdev)) { | |
3131 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3132 | " from array!\n", | |
3133 | bdevname(rdev->bdev,b)); | |
3134 | kick_rdev_from_array(rdev); | |
3135 | continue; | |
3136 | } | |
3137 | if (mddev->level == LEVEL_MULTIPATH) { | |
3138 | rdev->desc_nr = i++; | |
3139 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3140 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3141 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3142 | rdev->raid_disk = -1; |
3143 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3144 | } |
3145 | } | |
1da177e4 LT |
3146 | } |
3147 | ||
72e02075 N |
3148 | /* Read a fixed-point number. |
3149 | * Numbers in sysfs attributes should be in "standard" units where | |
3150 | * possible, so time should be in seconds. | |
3151 | * However we internally use a a much smaller unit such as | |
3152 | * milliseconds or jiffies. | |
3153 | * This function takes a decimal number with a possible fractional | |
3154 | * component, and produces an integer which is the result of | |
3155 | * multiplying that number by 10^'scale'. | |
3156 | * all without any floating-point arithmetic. | |
3157 | */ | |
3158 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3159 | { | |
3160 | unsigned long result = 0; | |
3161 | long decimals = -1; | |
3162 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3163 | if (*cp == '.') | |
3164 | decimals = 0; | |
3165 | else if (decimals < scale) { | |
3166 | unsigned int value; | |
3167 | value = *cp - '0'; | |
3168 | result = result * 10 + value; | |
3169 | if (decimals >= 0) | |
3170 | decimals++; | |
3171 | } | |
3172 | cp++; | |
3173 | } | |
3174 | if (*cp == '\n') | |
3175 | cp++; | |
3176 | if (*cp) | |
3177 | return -EINVAL; | |
3178 | if (decimals < 0) | |
3179 | decimals = 0; | |
3180 | while (decimals < scale) { | |
3181 | result *= 10; | |
3182 | decimals ++; | |
3183 | } | |
3184 | *res = result; | |
3185 | return 0; | |
3186 | } | |
3187 | ||
3188 | ||
19052c0e N |
3189 | static void md_safemode_timeout(unsigned long data); |
3190 | ||
16f17b39 N |
3191 | static ssize_t |
3192 | safe_delay_show(mddev_t *mddev, char *page) | |
3193 | { | |
3194 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3195 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3196 | } | |
3197 | static ssize_t | |
3198 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
3199 | { | |
16f17b39 | 3200 | unsigned long msec; |
97ce0a7f | 3201 | |
72e02075 | 3202 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3203 | return -EINVAL; |
16f17b39 N |
3204 | if (msec == 0) |
3205 | mddev->safemode_delay = 0; | |
3206 | else { | |
19052c0e | 3207 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
3208 | mddev->safemode_delay = (msec*HZ)/1000; |
3209 | if (mddev->safemode_delay == 0) | |
3210 | mddev->safemode_delay = 1; | |
19052c0e N |
3211 | if (mddev->safemode_delay < old_delay) |
3212 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
3213 | } |
3214 | return len; | |
3215 | } | |
3216 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3217 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3218 | |
eae1701f | 3219 | static ssize_t |
96de1e66 | 3220 | level_show(mddev_t *mddev, char *page) |
eae1701f | 3221 | { |
2604b703 | 3222 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 3223 | if (p) |
eae1701f | 3224 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
3225 | else if (mddev->clevel[0]) |
3226 | return sprintf(page, "%s\n", mddev->clevel); | |
3227 | else if (mddev->level != LEVEL_NONE) | |
3228 | return sprintf(page, "%d\n", mddev->level); | |
3229 | else | |
3230 | return 0; | |
eae1701f N |
3231 | } |
3232 | ||
d9d166c2 N |
3233 | static ssize_t |
3234 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
3235 | { | |
f2859af6 | 3236 | char clevel[16]; |
20a49ff6 | 3237 | ssize_t rv = len; |
245f46c2 | 3238 | struct mdk_personality *pers; |
f2859af6 | 3239 | long level; |
245f46c2 | 3240 | void *priv; |
3a981b03 | 3241 | mdk_rdev_t *rdev; |
245f46c2 N |
3242 | |
3243 | if (mddev->pers == NULL) { | |
3244 | if (len == 0) | |
3245 | return 0; | |
3246 | if (len >= sizeof(mddev->clevel)) | |
3247 | return -ENOSPC; | |
3248 | strncpy(mddev->clevel, buf, len); | |
3249 | if (mddev->clevel[len-1] == '\n') | |
3250 | len--; | |
3251 | mddev->clevel[len] = 0; | |
3252 | mddev->level = LEVEL_NONE; | |
3253 | return rv; | |
3254 | } | |
3255 | ||
3256 | /* request to change the personality. Need to ensure: | |
3257 | * - array is not engaged in resync/recovery/reshape | |
3258 | * - old personality can be suspended | |
3259 | * - new personality will access other array. | |
3260 | */ | |
3261 | ||
bb4f1e9d N |
3262 | if (mddev->sync_thread || |
3263 | mddev->reshape_position != MaxSector || | |
3264 | mddev->sysfs_active) | |
d9d166c2 | 3265 | return -EBUSY; |
245f46c2 N |
3266 | |
3267 | if (!mddev->pers->quiesce) { | |
3268 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3269 | mdname(mddev), mddev->pers->name); | |
3270 | return -EINVAL; | |
3271 | } | |
3272 | ||
3273 | /* Now find the new personality */ | |
f2859af6 | 3274 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3275 | return -EINVAL; |
f2859af6 DW |
3276 | strncpy(clevel, buf, len); |
3277 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3278 | len--; |
f2859af6 DW |
3279 | clevel[len] = 0; |
3280 | if (strict_strtol(clevel, 10, &level)) | |
3281 | level = LEVEL_NONE; | |
245f46c2 | 3282 | |
f2859af6 DW |
3283 | if (request_module("md-%s", clevel) != 0) |
3284 | request_module("md-level-%s", clevel); | |
245f46c2 | 3285 | spin_lock(&pers_lock); |
f2859af6 | 3286 | pers = find_pers(level, clevel); |
245f46c2 N |
3287 | if (!pers || !try_module_get(pers->owner)) { |
3288 | spin_unlock(&pers_lock); | |
f2859af6 | 3289 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3290 | return -EINVAL; |
3291 | } | |
3292 | spin_unlock(&pers_lock); | |
3293 | ||
3294 | if (pers == mddev->pers) { | |
3295 | /* Nothing to do! */ | |
3296 | module_put(pers->owner); | |
3297 | return rv; | |
3298 | } | |
3299 | if (!pers->takeover) { | |
3300 | module_put(pers->owner); | |
3301 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3302 | mdname(mddev), clevel); |
245f46c2 N |
3303 | return -EINVAL; |
3304 | } | |
3305 | ||
e93f68a1 N |
3306 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3307 | rdev->new_raid_disk = rdev->raid_disk; | |
3308 | ||
245f46c2 N |
3309 | /* ->takeover must set new_* and/or delta_disks |
3310 | * if it succeeds, and may set them when it fails. | |
3311 | */ | |
3312 | priv = pers->takeover(mddev); | |
3313 | if (IS_ERR(priv)) { | |
3314 | mddev->new_level = mddev->level; | |
3315 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3316 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3317 | mddev->raid_disks -= mddev->delta_disks; |
3318 | mddev->delta_disks = 0; | |
3319 | module_put(pers->owner); | |
3320 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3321 | mdname(mddev), clevel); |
245f46c2 N |
3322 | return PTR_ERR(priv); |
3323 | } | |
3324 | ||
3325 | /* Looks like we have a winner */ | |
3326 | mddev_suspend(mddev); | |
3327 | mddev->pers->stop(mddev); | |
a64c876f N |
3328 | |
3329 | if (mddev->pers->sync_request == NULL && | |
3330 | pers->sync_request != NULL) { | |
3331 | /* need to add the md_redundancy_group */ | |
3332 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3333 | printk(KERN_WARNING | |
3334 | "md: cannot register extra attributes for %s\n", | |
3335 | mdname(mddev)); | |
19fdb9ee | 3336 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3337 | } |
3338 | if (mddev->pers->sync_request != NULL && | |
3339 | pers->sync_request == NULL) { | |
3340 | /* need to remove the md_redundancy_group */ | |
3341 | if (mddev->to_remove == NULL) | |
3342 | mddev->to_remove = &md_redundancy_group; | |
3343 | } | |
3344 | ||
54071b38 TM |
3345 | if (mddev->pers->sync_request == NULL && |
3346 | mddev->external) { | |
3347 | /* We are converting from a no-redundancy array | |
3348 | * to a redundancy array and metadata is managed | |
3349 | * externally so we need to be sure that writes | |
3350 | * won't block due to a need to transition | |
3351 | * clean->dirty | |
3352 | * until external management is started. | |
3353 | */ | |
3354 | mddev->in_sync = 0; | |
3355 | mddev->safemode_delay = 0; | |
3356 | mddev->safemode = 0; | |
3357 | } | |
3358 | ||
e93f68a1 | 3359 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
e93f68a1 N |
3360 | if (rdev->raid_disk < 0) |
3361 | continue; | |
bf2cb0da | 3362 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3363 | rdev->new_raid_disk = -1; |
3364 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3365 | continue; | |
36fad858 | 3366 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 N |
3367 | } |
3368 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3369 | if (rdev->raid_disk < 0) | |
3370 | continue; | |
3371 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3372 | continue; | |
3373 | rdev->raid_disk = rdev->new_raid_disk; | |
3374 | if (rdev->raid_disk < 0) | |
3a981b03 | 3375 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3376 | else { |
36fad858 NK |
3377 | if (sysfs_link_rdev(mddev, rdev)) |
3378 | printk(KERN_WARNING "md: cannot register rd%d" | |
3379 | " for %s after level change\n", | |
3380 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3381 | } |
e93f68a1 N |
3382 | } |
3383 | ||
3384 | module_put(mddev->pers->owner); | |
245f46c2 N |
3385 | mddev->pers = pers; |
3386 | mddev->private = priv; | |
3387 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3388 | mddev->level = mddev->new_level; | |
3389 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3390 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3391 | mddev->delta_disks = 0; |
fee68723 | 3392 | mddev->degraded = 0; |
9af204cf TM |
3393 | if (mddev->pers->sync_request == NULL) { |
3394 | /* this is now an array without redundancy, so | |
3395 | * it must always be in_sync | |
3396 | */ | |
3397 | mddev->in_sync = 1; | |
3398 | del_timer_sync(&mddev->safemode_timer); | |
3399 | } | |
245f46c2 N |
3400 | pers->run(mddev); |
3401 | mddev_resume(mddev); | |
3402 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3403 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3404 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3405 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3406 | md_new_event(mddev); |
d9d166c2 N |
3407 | return rv; |
3408 | } | |
3409 | ||
3410 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3411 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3412 | |
d4dbd025 N |
3413 | |
3414 | static ssize_t | |
3415 | layout_show(mddev_t *mddev, char *page) | |
3416 | { | |
3417 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3418 | if (mddev->reshape_position != MaxSector && |
3419 | mddev->layout != mddev->new_layout) | |
3420 | return sprintf(page, "%d (%d)\n", | |
3421 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3422 | return sprintf(page, "%d\n", mddev->layout); |
3423 | } | |
3424 | ||
3425 | static ssize_t | |
3426 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
3427 | { | |
3428 | char *e; | |
3429 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3430 | |
3431 | if (!*buf || (*e && *e != '\n')) | |
3432 | return -EINVAL; | |
3433 | ||
b3546035 N |
3434 | if (mddev->pers) { |
3435 | int err; | |
50ac168a | 3436 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3437 | return -EBUSY; |
597a711b | 3438 | mddev->new_layout = n; |
50ac168a | 3439 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3440 | if (err) { |
3441 | mddev->new_layout = mddev->layout; | |
b3546035 | 3442 | return err; |
597a711b | 3443 | } |
b3546035 | 3444 | } else { |
08a02ecd | 3445 | mddev->new_layout = n; |
b3546035 N |
3446 | if (mddev->reshape_position == MaxSector) |
3447 | mddev->layout = n; | |
3448 | } | |
d4dbd025 N |
3449 | return len; |
3450 | } | |
3451 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3452 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3453 | |
3454 | ||
eae1701f | 3455 | static ssize_t |
96de1e66 | 3456 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3457 | { |
bb636547 N |
3458 | if (mddev->raid_disks == 0) |
3459 | return 0; | |
08a02ecd N |
3460 | if (mddev->reshape_position != MaxSector && |
3461 | mddev->delta_disks != 0) | |
3462 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3463 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3464 | return sprintf(page, "%d\n", mddev->raid_disks); |
3465 | } | |
3466 | ||
da943b99 N |
3467 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3468 | ||
3469 | static ssize_t | |
3470 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3471 | { | |
da943b99 N |
3472 | char *e; |
3473 | int rv = 0; | |
3474 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3475 | ||
3476 | if (!*buf || (*e && *e != '\n')) | |
3477 | return -EINVAL; | |
3478 | ||
3479 | if (mddev->pers) | |
3480 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3481 | else if (mddev->reshape_position != MaxSector) { |
3482 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3483 | mddev->delta_disks = n - olddisks; | |
3484 | mddev->raid_disks = n; | |
3485 | } else | |
da943b99 N |
3486 | mddev->raid_disks = n; |
3487 | return rv ? rv : len; | |
3488 | } | |
3489 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3490 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3491 | |
3b34380a N |
3492 | static ssize_t |
3493 | chunk_size_show(mddev_t *mddev, char *page) | |
3494 | { | |
08a02ecd | 3495 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3496 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3497 | return sprintf(page, "%d (%d)\n", | |
3498 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3499 | mddev->chunk_sectors << 9); |
3500 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3501 | } |
3502 | ||
3503 | static ssize_t | |
3504 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3505 | { | |
3b34380a N |
3506 | char *e; |
3507 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3508 | ||
3b34380a N |
3509 | if (!*buf || (*e && *e != '\n')) |
3510 | return -EINVAL; | |
3511 | ||
b3546035 N |
3512 | if (mddev->pers) { |
3513 | int err; | |
50ac168a | 3514 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3515 | return -EBUSY; |
597a711b | 3516 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3517 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3518 | if (err) { |
3519 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3520 | return err; |
597a711b | 3521 | } |
b3546035 | 3522 | } else { |
664e7c41 | 3523 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3524 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3525 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3526 | } |
3b34380a N |
3527 | return len; |
3528 | } | |
3529 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3530 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3531 | |
a94213b1 N |
3532 | static ssize_t |
3533 | resync_start_show(mddev_t *mddev, char *page) | |
3534 | { | |
d1a7c503 N |
3535 | if (mddev->recovery_cp == MaxSector) |
3536 | return sprintf(page, "none\n"); | |
a94213b1 N |
3537 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3538 | } | |
3539 | ||
3540 | static ssize_t | |
3541 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3542 | { | |
a94213b1 N |
3543 | char *e; |
3544 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3545 | ||
b098636c | 3546 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3547 | return -EBUSY; |
06e3c817 DW |
3548 | if (cmd_match(buf, "none")) |
3549 | n = MaxSector; | |
3550 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3551 | return -EINVAL; |
3552 | ||
3553 | mddev->recovery_cp = n; | |
3554 | return len; | |
3555 | } | |
3556 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3557 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3558 | |
9e653b63 N |
3559 | /* |
3560 | * The array state can be: | |
3561 | * | |
3562 | * clear | |
3563 | * No devices, no size, no level | |
3564 | * Equivalent to STOP_ARRAY ioctl | |
3565 | * inactive | |
3566 | * May have some settings, but array is not active | |
3567 | * all IO results in error | |
3568 | * When written, doesn't tear down array, but just stops it | |
3569 | * suspended (not supported yet) | |
3570 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3571 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3572 | * readonly |
3573 | * no resync can happen. no superblocks get written. | |
3574 | * write requests fail | |
3575 | * read-auto | |
3576 | * like readonly, but behaves like 'clean' on a write request. | |
3577 | * | |
3578 | * clean - no pending writes, but otherwise active. | |
3579 | * When written to inactive array, starts without resync | |
3580 | * If a write request arrives then | |
3581 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3582 | * if not known, block and switch to write-pending | |
3583 | * If written to an active array that has pending writes, then fails. | |
3584 | * active | |
3585 | * fully active: IO and resync can be happening. | |
3586 | * When written to inactive array, starts with resync | |
3587 | * | |
3588 | * write-pending | |
3589 | * clean, but writes are blocked waiting for 'active' to be written. | |
3590 | * | |
3591 | * active-idle | |
3592 | * like active, but no writes have been seen for a while (100msec). | |
3593 | * | |
3594 | */ | |
3595 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3596 | write_pending, active_idle, bad_word}; | |
05381954 | 3597 | static char *array_states[] = { |
9e653b63 N |
3598 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3599 | "write-pending", "active-idle", NULL }; | |
3600 | ||
3601 | static int match_word(const char *word, char **list) | |
3602 | { | |
3603 | int n; | |
3604 | for (n=0; list[n]; n++) | |
3605 | if (cmd_match(word, list[n])) | |
3606 | break; | |
3607 | return n; | |
3608 | } | |
3609 | ||
3610 | static ssize_t | |
3611 | array_state_show(mddev_t *mddev, char *page) | |
3612 | { | |
3613 | enum array_state st = inactive; | |
3614 | ||
3615 | if (mddev->pers) | |
3616 | switch(mddev->ro) { | |
3617 | case 1: | |
3618 | st = readonly; | |
3619 | break; | |
3620 | case 2: | |
3621 | st = read_auto; | |
3622 | break; | |
3623 | case 0: | |
3624 | if (mddev->in_sync) | |
3625 | st = clean; | |
070dc6dd | 3626 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3627 | st = write_pending; |
9e653b63 N |
3628 | else if (mddev->safemode) |
3629 | st = active_idle; | |
3630 | else | |
3631 | st = active; | |
3632 | } | |
3633 | else { | |
3634 | if (list_empty(&mddev->disks) && | |
3635 | mddev->raid_disks == 0 && | |
58c0fed4 | 3636 | mddev->dev_sectors == 0) |
9e653b63 N |
3637 | st = clear; |
3638 | else | |
3639 | st = inactive; | |
3640 | } | |
3641 | return sprintf(page, "%s\n", array_states[st]); | |
3642 | } | |
3643 | ||
df5b20cf | 3644 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
a4bd82d0 | 3645 | static int md_set_readonly(mddev_t * mddev, int is_open); |
9e653b63 N |
3646 | static int do_md_run(mddev_t * mddev); |
3647 | static int restart_array(mddev_t *mddev); | |
3648 | ||
3649 | static ssize_t | |
3650 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3651 | { | |
3652 | int err = -EINVAL; | |
3653 | enum array_state st = match_word(buf, array_states); | |
3654 | switch(st) { | |
3655 | case bad_word: | |
3656 | break; | |
3657 | case clear: | |
3658 | /* stopping an active array */ | |
f2ea68cf | 3659 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3660 | return -EBUSY; |
df5b20cf | 3661 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3662 | break; |
3663 | case inactive: | |
3664 | /* stopping an active array */ | |
3665 | if (mddev->pers) { | |
f2ea68cf | 3666 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3667 | return -EBUSY; |
df5b20cf | 3668 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3669 | } else |
3670 | err = 0; /* already inactive */ | |
9e653b63 N |
3671 | break; |
3672 | case suspended: | |
3673 | break; /* not supported yet */ | |
3674 | case readonly: | |
3675 | if (mddev->pers) | |
a4bd82d0 | 3676 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3677 | else { |
3678 | mddev->ro = 1; | |
648b629e | 3679 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3680 | err = do_md_run(mddev); |
3681 | } | |
3682 | break; | |
3683 | case read_auto: | |
9e653b63 | 3684 | if (mddev->pers) { |
80268ee9 | 3685 | if (mddev->ro == 0) |
a4bd82d0 | 3686 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3687 | else if (mddev->ro == 1) |
648b629e N |
3688 | err = restart_array(mddev); |
3689 | if (err == 0) { | |
3690 | mddev->ro = 2; | |
3691 | set_disk_ro(mddev->gendisk, 0); | |
3692 | } | |
9e653b63 N |
3693 | } else { |
3694 | mddev->ro = 2; | |
3695 | err = do_md_run(mddev); | |
3696 | } | |
3697 | break; | |
3698 | case clean: | |
3699 | if (mddev->pers) { | |
3700 | restart_array(mddev); | |
3701 | spin_lock_irq(&mddev->write_lock); | |
3702 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3703 | if (mddev->in_sync == 0) { |
3704 | mddev->in_sync = 1; | |
31a59e34 N |
3705 | if (mddev->safemode == 1) |
3706 | mddev->safemode = 0; | |
070dc6dd | 3707 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3708 | } |
3709 | err = 0; | |
3710 | } else | |
3711 | err = -EBUSY; | |
9e653b63 | 3712 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3713 | } else |
3714 | err = -EINVAL; | |
9e653b63 N |
3715 | break; |
3716 | case active: | |
3717 | if (mddev->pers) { | |
3718 | restart_array(mddev); | |
070dc6dd | 3719 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3720 | wake_up(&mddev->sb_wait); |
3721 | err = 0; | |
3722 | } else { | |
3723 | mddev->ro = 0; | |
648b629e | 3724 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3725 | err = do_md_run(mddev); |
3726 | } | |
3727 | break; | |
3728 | case write_pending: | |
3729 | case active_idle: | |
3730 | /* these cannot be set */ | |
3731 | break; | |
3732 | } | |
3733 | if (err) | |
3734 | return err; | |
0fd62b86 | 3735 | else { |
00bcb4ac | 3736 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3737 | return len; |
0fd62b86 | 3738 | } |
9e653b63 | 3739 | } |
80ca3a44 N |
3740 | static struct md_sysfs_entry md_array_state = |
3741 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3742 | |
1e50915f RB |
3743 | static ssize_t |
3744 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3745 | return sprintf(page, "%d\n", | |
3746 | atomic_read(&mddev->max_corr_read_errors)); | |
3747 | } | |
3748 | ||
3749 | static ssize_t | |
3750 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3751 | { | |
3752 | char *e; | |
3753 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3754 | ||
3755 | if (*buf && (*e == 0 || *e == '\n')) { | |
3756 | atomic_set(&mddev->max_corr_read_errors, n); | |
3757 | return len; | |
3758 | } | |
3759 | return -EINVAL; | |
3760 | } | |
3761 | ||
3762 | static struct md_sysfs_entry max_corr_read_errors = | |
3763 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3764 | max_corrected_read_errors_store); | |
3765 | ||
6d7ff738 N |
3766 | static ssize_t |
3767 | null_show(mddev_t *mddev, char *page) | |
3768 | { | |
3769 | return -EINVAL; | |
3770 | } | |
3771 | ||
3772 | static ssize_t | |
3773 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3774 | { | |
3775 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3776 | /* The new device is added to the array. | |
3777 | * If the array has a persistent superblock, we read the | |
3778 | * superblock to initialise info and check validity. | |
3779 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3780 | * which mainly checks size. | |
3781 | */ | |
3782 | char *e; | |
3783 | int major = simple_strtoul(buf, &e, 10); | |
3784 | int minor; | |
3785 | dev_t dev; | |
3786 | mdk_rdev_t *rdev; | |
3787 | int err; | |
3788 | ||
3789 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3790 | return -EINVAL; | |
3791 | minor = simple_strtoul(e+1, &e, 10); | |
3792 | if (*e && *e != '\n') | |
3793 | return -EINVAL; | |
3794 | dev = MKDEV(major, minor); | |
3795 | if (major != MAJOR(dev) || | |
3796 | minor != MINOR(dev)) | |
3797 | return -EOVERFLOW; | |
3798 | ||
3799 | ||
3800 | if (mddev->persistent) { | |
3801 | rdev = md_import_device(dev, mddev->major_version, | |
3802 | mddev->minor_version); | |
3803 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3804 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3805 | mdk_rdev_t, same_set); | |
3806 | err = super_types[mddev->major_version] | |
3807 | .load_super(rdev, rdev0, mddev->minor_version); | |
3808 | if (err < 0) | |
3809 | goto out; | |
3810 | } | |
c5d79adb N |
3811 | } else if (mddev->external) |
3812 | rdev = md_import_device(dev, -2, -1); | |
3813 | else | |
6d7ff738 N |
3814 | rdev = md_import_device(dev, -1, -1); |
3815 | ||
3816 | if (IS_ERR(rdev)) | |
3817 | return PTR_ERR(rdev); | |
3818 | err = bind_rdev_to_array(rdev, mddev); | |
3819 | out: | |
3820 | if (err) | |
3821 | export_rdev(rdev); | |
3822 | return err ? err : len; | |
3823 | } | |
3824 | ||
3825 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3826 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3827 | |
9b1d1dac PC |
3828 | static ssize_t |
3829 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3830 | { | |
3831 | char *end; | |
3832 | unsigned long chunk, end_chunk; | |
3833 | ||
3834 | if (!mddev->bitmap) | |
3835 | goto out; | |
3836 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3837 | while (*buf) { | |
3838 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3839 | if (buf == end) break; | |
3840 | if (*end == '-') { /* range */ | |
3841 | buf = end + 1; | |
3842 | end_chunk = simple_strtoul(buf, &end, 0); | |
3843 | if (buf == end) break; | |
3844 | } | |
3845 | if (*end && !isspace(*end)) break; | |
3846 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3847 | buf = skip_spaces(end); |
9b1d1dac PC |
3848 | } |
3849 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3850 | out: | |
3851 | return len; | |
3852 | } | |
3853 | ||
3854 | static struct md_sysfs_entry md_bitmap = | |
3855 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3856 | ||
a35b0d69 N |
3857 | static ssize_t |
3858 | size_show(mddev_t *mddev, char *page) | |
3859 | { | |
58c0fed4 AN |
3860 | return sprintf(page, "%llu\n", |
3861 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3862 | } |
3863 | ||
d71f9f88 | 3864 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3865 | |
3866 | static ssize_t | |
3867 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3868 | { | |
3869 | /* If array is inactive, we can reduce the component size, but | |
3870 | * not increase it (except from 0). | |
3871 | * If array is active, we can try an on-line resize | |
3872 | */ | |
b522adcd DW |
3873 | sector_t sectors; |
3874 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3875 | |
58c0fed4 AN |
3876 | if (err < 0) |
3877 | return err; | |
a35b0d69 | 3878 | if (mddev->pers) { |
58c0fed4 | 3879 | err = update_size(mddev, sectors); |
850b2b42 | 3880 | md_update_sb(mddev, 1); |
a35b0d69 | 3881 | } else { |
58c0fed4 AN |
3882 | if (mddev->dev_sectors == 0 || |
3883 | mddev->dev_sectors > sectors) | |
3884 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3885 | else |
3886 | err = -ENOSPC; | |
3887 | } | |
3888 | return err ? err : len; | |
3889 | } | |
3890 | ||
3891 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3892 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3893 | |
8bb93aac N |
3894 | |
3895 | /* Metdata version. | |
e691063a N |
3896 | * This is one of |
3897 | * 'none' for arrays with no metadata (good luck...) | |
3898 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3899 | * or N.M for internally known formats |
3900 | */ | |
3901 | static ssize_t | |
3902 | metadata_show(mddev_t *mddev, char *page) | |
3903 | { | |
3904 | if (mddev->persistent) | |
3905 | return sprintf(page, "%d.%d\n", | |
3906 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3907 | else if (mddev->external) |
3908 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3909 | else |
3910 | return sprintf(page, "none\n"); | |
3911 | } | |
3912 | ||
3913 | static ssize_t | |
3914 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3915 | { | |
3916 | int major, minor; | |
3917 | char *e; | |
ea43ddd8 N |
3918 | /* Changing the details of 'external' metadata is |
3919 | * always permitted. Otherwise there must be | |
3920 | * no devices attached to the array. | |
3921 | */ | |
3922 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3923 | ; | |
3924 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3925 | return -EBUSY; |
3926 | ||
3927 | if (cmd_match(buf, "none")) { | |
3928 | mddev->persistent = 0; | |
e691063a N |
3929 | mddev->external = 0; |
3930 | mddev->major_version = 0; | |
3931 | mddev->minor_version = 90; | |
3932 | return len; | |
3933 | } | |
3934 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3935 | size_t namelen = len-9; |
e691063a N |
3936 | if (namelen >= sizeof(mddev->metadata_type)) |
3937 | namelen = sizeof(mddev->metadata_type)-1; | |
3938 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3939 | mddev->metadata_type[namelen] = 0; | |
3940 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3941 | mddev->metadata_type[--namelen] = 0; | |
3942 | mddev->persistent = 0; | |
3943 | mddev->external = 1; | |
8bb93aac N |
3944 | mddev->major_version = 0; |
3945 | mddev->minor_version = 90; | |
3946 | return len; | |
3947 | } | |
3948 | major = simple_strtoul(buf, &e, 10); | |
3949 | if (e==buf || *e != '.') | |
3950 | return -EINVAL; | |
3951 | buf = e+1; | |
3952 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3953 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3954 | return -EINVAL; |
50511da3 | 3955 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3956 | return -ENOENT; |
3957 | mddev->major_version = major; | |
3958 | mddev->minor_version = minor; | |
3959 | mddev->persistent = 1; | |
e691063a | 3960 | mddev->external = 0; |
8bb93aac N |
3961 | return len; |
3962 | } | |
3963 | ||
3964 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3965 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3966 | |
24dd469d | 3967 | static ssize_t |
7eec314d | 3968 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3969 | { |
7eec314d | 3970 | char *type = "idle"; |
b6a9ce68 N |
3971 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3972 | type = "frozen"; | |
3973 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3974 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3975 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3976 | type = "reshape"; | |
3977 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3978 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3979 | type = "resync"; | |
3980 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3981 | type = "check"; | |
3982 | else | |
3983 | type = "repair"; | |
72a23c21 | 3984 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3985 | type = "recover"; |
3986 | } | |
3987 | return sprintf(page, "%s\n", type); | |
3988 | } | |
3989 | ||
7ebc0be7 N |
3990 | static void reap_sync_thread(mddev_t *mddev); |
3991 | ||
24dd469d | 3992 | static ssize_t |
7eec314d | 3993 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3994 | { |
7eec314d N |
3995 | if (!mddev->pers || !mddev->pers->sync_request) |
3996 | return -EINVAL; | |
3997 | ||
b6a9ce68 N |
3998 | if (cmd_match(page, "frozen")) |
3999 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4000 | else | |
4001 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4002 | ||
4003 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
4004 | if (mddev->sync_thread) { |
4005 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 4006 | reap_sync_thread(mddev); |
7eec314d | 4007 | } |
03c902e1 N |
4008 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
4009 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 4010 | return -EBUSY; |
72a23c21 NB |
4011 | else if (cmd_match(page, "resync")) |
4012 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4013 | else if (cmd_match(page, "recover")) { | |
4014 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 4015 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 4016 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
4017 | int err; |
4018 | if (mddev->pers->start_reshape == NULL) | |
4019 | return -EINVAL; | |
4020 | err = mddev->pers->start_reshape(mddev); | |
4021 | if (err) | |
4022 | return err; | |
a99ac971 | 4023 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 4024 | } else { |
bce74dac | 4025 | if (cmd_match(page, "check")) |
7eec314d | 4026 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 4027 | else if (!cmd_match(page, "repair")) |
7eec314d N |
4028 | return -EINVAL; |
4029 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
4030 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 4031 | } |
03c902e1 | 4032 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 4033 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 4034 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
4035 | return len; |
4036 | } | |
4037 | ||
9d88883e | 4038 | static ssize_t |
96de1e66 | 4039 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
4040 | { |
4041 | return sprintf(page, "%llu\n", | |
4042 | (unsigned long long) mddev->resync_mismatches); | |
4043 | } | |
4044 | ||
80ca3a44 N |
4045 | static struct md_sysfs_entry md_scan_mode = |
4046 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 4047 | |
96de1e66 | 4048 | |
80ca3a44 | 4049 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 4050 | |
88202a0c N |
4051 | static ssize_t |
4052 | sync_min_show(mddev_t *mddev, char *page) | |
4053 | { | |
4054 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
4055 | mddev->sync_speed_min ? "local": "system"); | |
4056 | } | |
4057 | ||
4058 | static ssize_t | |
4059 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
4060 | { | |
4061 | int min; | |
4062 | char *e; | |
4063 | if (strncmp(buf, "system", 6)==0) { | |
4064 | mddev->sync_speed_min = 0; | |
4065 | return len; | |
4066 | } | |
4067 | min = simple_strtoul(buf, &e, 10); | |
4068 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4069 | return -EINVAL; | |
4070 | mddev->sync_speed_min = min; | |
4071 | return len; | |
4072 | } | |
4073 | ||
4074 | static struct md_sysfs_entry md_sync_min = | |
4075 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4076 | ||
4077 | static ssize_t | |
4078 | sync_max_show(mddev_t *mddev, char *page) | |
4079 | { | |
4080 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4081 | mddev->sync_speed_max ? "local": "system"); | |
4082 | } | |
4083 | ||
4084 | static ssize_t | |
4085 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
4086 | { | |
4087 | int max; | |
4088 | char *e; | |
4089 | if (strncmp(buf, "system", 6)==0) { | |
4090 | mddev->sync_speed_max = 0; | |
4091 | return len; | |
4092 | } | |
4093 | max = simple_strtoul(buf, &e, 10); | |
4094 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4095 | return -EINVAL; | |
4096 | mddev->sync_speed_max = max; | |
4097 | return len; | |
4098 | } | |
4099 | ||
4100 | static struct md_sysfs_entry md_sync_max = | |
4101 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4102 | ||
d7f3d291 IP |
4103 | static ssize_t |
4104 | degraded_show(mddev_t *mddev, char *page) | |
4105 | { | |
4106 | return sprintf(page, "%d\n", mddev->degraded); | |
4107 | } | |
4108 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4109 | |
90b08710 BS |
4110 | static ssize_t |
4111 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
4112 | { | |
4113 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4114 | } | |
4115 | ||
4116 | static ssize_t | |
4117 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
4118 | { | |
4119 | long n; | |
4120 | ||
4121 | if (strict_strtol(buf, 10, &n)) | |
4122 | return -EINVAL; | |
4123 | ||
4124 | if (n != 0 && n != 1) | |
4125 | return -EINVAL; | |
4126 | ||
4127 | mddev->parallel_resync = n; | |
4128 | ||
4129 | if (mddev->sync_thread) | |
4130 | wake_up(&resync_wait); | |
4131 | ||
4132 | return len; | |
4133 | } | |
4134 | ||
4135 | /* force parallel resync, even with shared block devices */ | |
4136 | static struct md_sysfs_entry md_sync_force_parallel = | |
4137 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4138 | sync_force_parallel_show, sync_force_parallel_store); | |
4139 | ||
88202a0c N |
4140 | static ssize_t |
4141 | sync_speed_show(mddev_t *mddev, char *page) | |
4142 | { | |
4143 | unsigned long resync, dt, db; | |
d1a7c503 N |
4144 | if (mddev->curr_resync == 0) |
4145 | return sprintf(page, "none\n"); | |
9687a60c AN |
4146 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4147 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4148 | if (!dt) dt++; |
9687a60c AN |
4149 | db = resync - mddev->resync_mark_cnt; |
4150 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4151 | } |
4152 | ||
80ca3a44 | 4153 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4154 | |
4155 | static ssize_t | |
4156 | sync_completed_show(mddev_t *mddev, char *page) | |
4157 | { | |
13ae864b | 4158 | unsigned long long max_sectors, resync; |
88202a0c | 4159 | |
acb180b0 N |
4160 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4161 | return sprintf(page, "none\n"); | |
4162 | ||
88202a0c | 4163 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 4164 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4165 | else |
58c0fed4 | 4166 | max_sectors = mddev->dev_sectors; |
88202a0c | 4167 | |
acb180b0 | 4168 | resync = mddev->curr_resync_completed; |
13ae864b | 4169 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4170 | } |
4171 | ||
80ca3a44 | 4172 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4173 | |
5e96ee65 NB |
4174 | static ssize_t |
4175 | min_sync_show(mddev_t *mddev, char *page) | |
4176 | { | |
4177 | return sprintf(page, "%llu\n", | |
4178 | (unsigned long long)mddev->resync_min); | |
4179 | } | |
4180 | static ssize_t | |
4181 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
4182 | { | |
4183 | unsigned long long min; | |
4184 | if (strict_strtoull(buf, 10, &min)) | |
4185 | return -EINVAL; | |
4186 | if (min > mddev->resync_max) | |
4187 | return -EINVAL; | |
4188 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4189 | return -EBUSY; | |
4190 | ||
4191 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4192 | if (mddev->chunk_sectors) { |
2ac06c33 | 4193 | sector_t temp = min; |
9d8f0363 | 4194 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4195 | return -EINVAL; |
4196 | } | |
4197 | mddev->resync_min = min; | |
4198 | ||
4199 | return len; | |
4200 | } | |
4201 | ||
4202 | static struct md_sysfs_entry md_min_sync = | |
4203 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4204 | ||
c6207277 N |
4205 | static ssize_t |
4206 | max_sync_show(mddev_t *mddev, char *page) | |
4207 | { | |
4208 | if (mddev->resync_max == MaxSector) | |
4209 | return sprintf(page, "max\n"); | |
4210 | else | |
4211 | return sprintf(page, "%llu\n", | |
4212 | (unsigned long long)mddev->resync_max); | |
4213 | } | |
4214 | static ssize_t | |
4215 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
4216 | { | |
4217 | if (strncmp(buf, "max", 3) == 0) | |
4218 | mddev->resync_max = MaxSector; | |
4219 | else { | |
5e96ee65 NB |
4220 | unsigned long long max; |
4221 | if (strict_strtoull(buf, 10, &max)) | |
4222 | return -EINVAL; | |
4223 | if (max < mddev->resync_min) | |
c6207277 N |
4224 | return -EINVAL; |
4225 | if (max < mddev->resync_max && | |
4d484a4a | 4226 | mddev->ro == 0 && |
c6207277 N |
4227 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4228 | return -EBUSY; | |
4229 | ||
4230 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4231 | if (mddev->chunk_sectors) { |
2ac06c33 | 4232 | sector_t temp = max; |
9d8f0363 | 4233 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4234 | return -EINVAL; |
4235 | } | |
4236 | mddev->resync_max = max; | |
4237 | } | |
4238 | wake_up(&mddev->recovery_wait); | |
4239 | return len; | |
4240 | } | |
4241 | ||
4242 | static struct md_sysfs_entry md_max_sync = | |
4243 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4244 | ||
e464eafd N |
4245 | static ssize_t |
4246 | suspend_lo_show(mddev_t *mddev, char *page) | |
4247 | { | |
4248 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4249 | } | |
4250 | ||
4251 | static ssize_t | |
4252 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
4253 | { | |
4254 | char *e; | |
4255 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4256 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4257 | |
b8d966ef N |
4258 | if (mddev->pers == NULL || |
4259 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4260 | return -EINVAL; |
4261 | if (buf == e || (*e && *e != '\n')) | |
4262 | return -EINVAL; | |
23ddff37 N |
4263 | |
4264 | mddev->suspend_lo = new; | |
4265 | if (new >= old) | |
4266 | /* Shrinking suspended region */ | |
e464eafd | 4267 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4268 | else { |
4269 | /* Expanding suspended region - need to wait */ | |
4270 | mddev->pers->quiesce(mddev, 1); | |
4271 | mddev->pers->quiesce(mddev, 0); | |
4272 | } | |
4273 | return len; | |
e464eafd N |
4274 | } |
4275 | static struct md_sysfs_entry md_suspend_lo = | |
4276 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4277 | ||
4278 | ||
4279 | static ssize_t | |
4280 | suspend_hi_show(mddev_t *mddev, char *page) | |
4281 | { | |
4282 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4283 | } | |
4284 | ||
4285 | static ssize_t | |
4286 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
4287 | { | |
4288 | char *e; | |
4289 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4290 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4291 | |
b8d966ef N |
4292 | if (mddev->pers == NULL || |
4293 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4294 | return -EINVAL; |
4295 | if (buf == e || (*e && *e != '\n')) | |
4296 | return -EINVAL; | |
23ddff37 N |
4297 | |
4298 | mddev->suspend_hi = new; | |
4299 | if (new <= old) | |
4300 | /* Shrinking suspended region */ | |
4301 | mddev->pers->quiesce(mddev, 2); | |
4302 | else { | |
4303 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4304 | mddev->pers->quiesce(mddev, 1); |
4305 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4306 | } |
4307 | return len; | |
e464eafd N |
4308 | } |
4309 | static struct md_sysfs_entry md_suspend_hi = | |
4310 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4311 | ||
08a02ecd N |
4312 | static ssize_t |
4313 | reshape_position_show(mddev_t *mddev, char *page) | |
4314 | { | |
4315 | if (mddev->reshape_position != MaxSector) | |
4316 | return sprintf(page, "%llu\n", | |
4317 | (unsigned long long)mddev->reshape_position); | |
4318 | strcpy(page, "none\n"); | |
4319 | return 5; | |
4320 | } | |
4321 | ||
4322 | static ssize_t | |
4323 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
4324 | { | |
4325 | char *e; | |
4326 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4327 | if (mddev->pers) | |
4328 | return -EBUSY; | |
4329 | if (buf == e || (*e && *e != '\n')) | |
4330 | return -EINVAL; | |
4331 | mddev->reshape_position = new; | |
4332 | mddev->delta_disks = 0; | |
4333 | mddev->new_level = mddev->level; | |
4334 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4335 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4336 | return len; |
4337 | } | |
4338 | ||
4339 | static struct md_sysfs_entry md_reshape_position = | |
4340 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4341 | reshape_position_store); | |
4342 | ||
b522adcd DW |
4343 | static ssize_t |
4344 | array_size_show(mddev_t *mddev, char *page) | |
4345 | { | |
4346 | if (mddev->external_size) | |
4347 | return sprintf(page, "%llu\n", | |
4348 | (unsigned long long)mddev->array_sectors/2); | |
4349 | else | |
4350 | return sprintf(page, "default\n"); | |
4351 | } | |
4352 | ||
4353 | static ssize_t | |
4354 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
4355 | { | |
4356 | sector_t sectors; | |
4357 | ||
4358 | if (strncmp(buf, "default", 7) == 0) { | |
4359 | if (mddev->pers) | |
4360 | sectors = mddev->pers->size(mddev, 0, 0); | |
4361 | else | |
4362 | sectors = mddev->array_sectors; | |
4363 | ||
4364 | mddev->external_size = 0; | |
4365 | } else { | |
4366 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4367 | return -EINVAL; | |
4368 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4369 | return -E2BIG; |
b522adcd DW |
4370 | |
4371 | mddev->external_size = 1; | |
4372 | } | |
4373 | ||
4374 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4375 | if (mddev->pers) { |
4376 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4377 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4378 | } |
b522adcd DW |
4379 | return len; |
4380 | } | |
4381 | ||
4382 | static struct md_sysfs_entry md_array_size = | |
4383 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4384 | array_size_store); | |
e464eafd | 4385 | |
eae1701f N |
4386 | static struct attribute *md_default_attrs[] = { |
4387 | &md_level.attr, | |
d4dbd025 | 4388 | &md_layout.attr, |
eae1701f | 4389 | &md_raid_disks.attr, |
3b34380a | 4390 | &md_chunk_size.attr, |
a35b0d69 | 4391 | &md_size.attr, |
a94213b1 | 4392 | &md_resync_start.attr, |
8bb93aac | 4393 | &md_metadata.attr, |
6d7ff738 | 4394 | &md_new_device.attr, |
16f17b39 | 4395 | &md_safe_delay.attr, |
9e653b63 | 4396 | &md_array_state.attr, |
08a02ecd | 4397 | &md_reshape_position.attr, |
b522adcd | 4398 | &md_array_size.attr, |
1e50915f | 4399 | &max_corr_read_errors.attr, |
411036fa N |
4400 | NULL, |
4401 | }; | |
4402 | ||
4403 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4404 | &md_scan_mode.attr, |
9d88883e | 4405 | &md_mismatches.attr, |
88202a0c N |
4406 | &md_sync_min.attr, |
4407 | &md_sync_max.attr, | |
4408 | &md_sync_speed.attr, | |
90b08710 | 4409 | &md_sync_force_parallel.attr, |
88202a0c | 4410 | &md_sync_completed.attr, |
5e96ee65 | 4411 | &md_min_sync.attr, |
c6207277 | 4412 | &md_max_sync.attr, |
e464eafd N |
4413 | &md_suspend_lo.attr, |
4414 | &md_suspend_hi.attr, | |
9b1d1dac | 4415 | &md_bitmap.attr, |
d7f3d291 | 4416 | &md_degraded.attr, |
eae1701f N |
4417 | NULL, |
4418 | }; | |
411036fa N |
4419 | static struct attribute_group md_redundancy_group = { |
4420 | .name = NULL, | |
4421 | .attrs = md_redundancy_attrs, | |
4422 | }; | |
4423 | ||
eae1701f N |
4424 | |
4425 | static ssize_t | |
4426 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4427 | { | |
4428 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4429 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4430 | ssize_t rv; |
eae1701f N |
4431 | |
4432 | if (!entry->show) | |
4433 | return -EIO; | |
5dc5cf7d IM |
4434 | rv = mddev_lock(mddev); |
4435 | if (!rv) { | |
4436 | rv = entry->show(mddev, page); | |
4437 | mddev_unlock(mddev); | |
4438 | } | |
96de1e66 | 4439 | return rv; |
eae1701f N |
4440 | } |
4441 | ||
4442 | static ssize_t | |
4443 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4444 | const char *page, size_t length) | |
4445 | { | |
4446 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4447 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4448 | ssize_t rv; |
eae1701f N |
4449 | |
4450 | if (!entry->store) | |
4451 | return -EIO; | |
67463acb N |
4452 | if (!capable(CAP_SYS_ADMIN)) |
4453 | return -EACCES; | |
5dc5cf7d | 4454 | rv = mddev_lock(mddev); |
d3374825 N |
4455 | if (mddev->hold_active == UNTIL_IOCTL) |
4456 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4457 | if (!rv) { |
4458 | rv = entry->store(mddev, page, length); | |
4459 | mddev_unlock(mddev); | |
4460 | } | |
96de1e66 | 4461 | return rv; |
eae1701f N |
4462 | } |
4463 | ||
4464 | static void md_free(struct kobject *ko) | |
4465 | { | |
4466 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4467 | |
4468 | if (mddev->sysfs_state) | |
4469 | sysfs_put(mddev->sysfs_state); | |
4470 | ||
4471 | if (mddev->gendisk) { | |
4472 | del_gendisk(mddev->gendisk); | |
4473 | put_disk(mddev->gendisk); | |
4474 | } | |
4475 | if (mddev->queue) | |
4476 | blk_cleanup_queue(mddev->queue); | |
4477 | ||
eae1701f N |
4478 | kfree(mddev); |
4479 | } | |
4480 | ||
52cf25d0 | 4481 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4482 | .show = md_attr_show, |
4483 | .store = md_attr_store, | |
4484 | }; | |
4485 | static struct kobj_type md_ktype = { | |
4486 | .release = md_free, | |
4487 | .sysfs_ops = &md_sysfs_ops, | |
4488 | .default_attrs = md_default_attrs, | |
4489 | }; | |
4490 | ||
1da177e4 LT |
4491 | int mdp_major = 0; |
4492 | ||
5fd3a17e DW |
4493 | static void mddev_delayed_delete(struct work_struct *ws) |
4494 | { | |
4495 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4496 | ||
43a70507 | 4497 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4498 | kobject_del(&mddev->kobj); |
4499 | kobject_put(&mddev->kobj); | |
4500 | } | |
4501 | ||
efeb53c0 | 4502 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4503 | { |
48c9c27b | 4504 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4505 | mddev_t *mddev = mddev_find(dev); |
4506 | struct gendisk *disk; | |
efeb53c0 N |
4507 | int partitioned; |
4508 | int shift; | |
4509 | int unit; | |
3830c62f | 4510 | int error; |
1da177e4 LT |
4511 | |
4512 | if (!mddev) | |
efeb53c0 N |
4513 | return -ENODEV; |
4514 | ||
4515 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4516 | shift = partitioned ? MdpMinorShift : 0; | |
4517 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4518 | |
e804ac78 TH |
4519 | /* wait for any previous instance of this device to be |
4520 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4521 | */ |
e804ac78 | 4522 | flush_workqueue(md_misc_wq); |
d3374825 | 4523 | |
48c9c27b | 4524 | mutex_lock(&disks_mutex); |
0909dc44 N |
4525 | error = -EEXIST; |
4526 | if (mddev->gendisk) | |
4527 | goto abort; | |
efeb53c0 N |
4528 | |
4529 | if (name) { | |
4530 | /* Need to ensure that 'name' is not a duplicate. | |
4531 | */ | |
4532 | mddev_t *mddev2; | |
4533 | spin_lock(&all_mddevs_lock); | |
4534 | ||
4535 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4536 | if (mddev2->gendisk && | |
4537 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4538 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4539 | goto abort; |
efeb53c0 N |
4540 | } |
4541 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4542 | } |
8b765398 | 4543 | |
0909dc44 | 4544 | error = -ENOMEM; |
8b765398 | 4545 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4546 | if (!mddev->queue) |
4547 | goto abort; | |
409c57f3 N |
4548 | mddev->queue->queuedata = mddev; |
4549 | ||
409c57f3 | 4550 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4551 | |
1da177e4 LT |
4552 | disk = alloc_disk(1 << shift); |
4553 | if (!disk) { | |
8b765398 N |
4554 | blk_cleanup_queue(mddev->queue); |
4555 | mddev->queue = NULL; | |
0909dc44 | 4556 | goto abort; |
1da177e4 | 4557 | } |
efeb53c0 | 4558 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4559 | disk->first_minor = unit << shift; |
efeb53c0 N |
4560 | if (name) |
4561 | strcpy(disk->disk_name, name); | |
4562 | else if (partitioned) | |
1da177e4 | 4563 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4564 | else |
1da177e4 | 4565 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4566 | disk->fops = &md_fops; |
4567 | disk->private_data = mddev; | |
4568 | disk->queue = mddev->queue; | |
b0140891 | 4569 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4570 | /* Allow extended partitions. This makes the |
d3374825 | 4571 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4572 | * remove it now. |
4573 | */ | |
4574 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4575 | mddev->gendisk = disk; |
b0140891 N |
4576 | /* As soon as we call add_disk(), another thread could get |
4577 | * through to md_open, so make sure it doesn't get too far | |
4578 | */ | |
4579 | mutex_lock(&mddev->open_mutex); | |
4580 | add_disk(disk); | |
4581 | ||
ed9e1982 TH |
4582 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4583 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4584 | if (error) { |
4585 | /* This isn't possible, but as kobject_init_and_add is marked | |
4586 | * __must_check, we must do something with the result | |
4587 | */ | |
5e55e2f5 N |
4588 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4589 | disk->disk_name); | |
0909dc44 N |
4590 | error = 0; |
4591 | } | |
00bcb4ac N |
4592 | if (mddev->kobj.sd && |
4593 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4594 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4595 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4596 | abort: |
4597 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4598 | if (!error && mddev->kobj.sd) { |
3830c62f | 4599 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4600 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4601 | } |
d3374825 | 4602 | mddev_put(mddev); |
0909dc44 | 4603 | return error; |
efeb53c0 N |
4604 | } |
4605 | ||
4606 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4607 | { | |
4608 | md_alloc(dev, NULL); | |
1da177e4 LT |
4609 | return NULL; |
4610 | } | |
4611 | ||
efeb53c0 N |
4612 | static int add_named_array(const char *val, struct kernel_param *kp) |
4613 | { | |
4614 | /* val must be "md_*" where * is not all digits. | |
4615 | * We allocate an array with a large free minor number, and | |
4616 | * set the name to val. val must not already be an active name. | |
4617 | */ | |
4618 | int len = strlen(val); | |
4619 | char buf[DISK_NAME_LEN]; | |
4620 | ||
4621 | while (len && val[len-1] == '\n') | |
4622 | len--; | |
4623 | if (len >= DISK_NAME_LEN) | |
4624 | return -E2BIG; | |
4625 | strlcpy(buf, val, len+1); | |
4626 | if (strncmp(buf, "md_", 3) != 0) | |
4627 | return -EINVAL; | |
4628 | return md_alloc(0, buf); | |
4629 | } | |
4630 | ||
1da177e4 LT |
4631 | static void md_safemode_timeout(unsigned long data) |
4632 | { | |
4633 | mddev_t *mddev = (mddev_t *) data; | |
4634 | ||
0fd62b86 NB |
4635 | if (!atomic_read(&mddev->writes_pending)) { |
4636 | mddev->safemode = 1; | |
4637 | if (mddev->external) | |
00bcb4ac | 4638 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4639 | } |
1da177e4 LT |
4640 | md_wakeup_thread(mddev->thread); |
4641 | } | |
4642 | ||
6ff8d8ec | 4643 | static int start_dirty_degraded; |
1da177e4 | 4644 | |
390ee602 | 4645 | int md_run(mddev_t *mddev) |
1da177e4 | 4646 | { |
2604b703 | 4647 | int err; |
1da177e4 | 4648 | mdk_rdev_t *rdev; |
2604b703 | 4649 | struct mdk_personality *pers; |
1da177e4 | 4650 | |
a757e64c N |
4651 | if (list_empty(&mddev->disks)) |
4652 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4653 | return -EINVAL; |
1da177e4 LT |
4654 | |
4655 | if (mddev->pers) | |
4656 | return -EBUSY; | |
bb4f1e9d N |
4657 | /* Cannot run until previous stop completes properly */ |
4658 | if (mddev->sysfs_active) | |
4659 | return -EBUSY; | |
b6eb127d | 4660 | |
1da177e4 LT |
4661 | /* |
4662 | * Analyze all RAID superblock(s) | |
4663 | */ | |
1ec4a939 N |
4664 | if (!mddev->raid_disks) { |
4665 | if (!mddev->persistent) | |
4666 | return -EINVAL; | |
a757e64c | 4667 | analyze_sbs(mddev); |
1ec4a939 | 4668 | } |
1da177e4 | 4669 | |
d9d166c2 N |
4670 | if (mddev->level != LEVEL_NONE) |
4671 | request_module("md-level-%d", mddev->level); | |
4672 | else if (mddev->clevel[0]) | |
4673 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4674 | |
4675 | /* | |
4676 | * Drop all container device buffers, from now on | |
4677 | * the only valid external interface is through the md | |
4678 | * device. | |
1da177e4 | 4679 | */ |
159ec1fc | 4680 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4681 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4682 | continue; |
4683 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4684 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4685 | |
4686 | /* perform some consistency tests on the device. | |
4687 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4688 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4689 | */ |
a6ff7e08 JB |
4690 | if (rdev->meta_bdev) { |
4691 | /* Nothing to check */; | |
4692 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4693 | if (mddev->dev_sectors && |
4694 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4695 | > rdev->sb_start) { |
f0d76d70 N |
4696 | printk("md: %s: data overlaps metadata\n", |
4697 | mdname(mddev)); | |
4698 | return -EINVAL; | |
4699 | } | |
4700 | } else { | |
0f420358 | 4701 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4702 | > rdev->data_offset) { |
4703 | printk("md: %s: metadata overlaps data\n", | |
4704 | mdname(mddev)); | |
4705 | return -EINVAL; | |
4706 | } | |
4707 | } | |
00bcb4ac | 4708 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4709 | } |
4710 | ||
a167f663 | 4711 | if (mddev->bio_set == NULL) |
a519b26d N |
4712 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, |
4713 | sizeof(mddev_t *)); | |
a167f663 | 4714 | |
1da177e4 | 4715 | spin_lock(&pers_lock); |
d9d166c2 | 4716 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4717 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4718 | spin_unlock(&pers_lock); |
d9d166c2 N |
4719 | if (mddev->level != LEVEL_NONE) |
4720 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4721 | mddev->level); | |
4722 | else | |
4723 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4724 | mddev->clevel); | |
1da177e4 LT |
4725 | return -EINVAL; |
4726 | } | |
2604b703 | 4727 | mddev->pers = pers; |
1da177e4 | 4728 | spin_unlock(&pers_lock); |
34817e8c N |
4729 | if (mddev->level != pers->level) { |
4730 | mddev->level = pers->level; | |
4731 | mddev->new_level = pers->level; | |
4732 | } | |
d9d166c2 | 4733 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4734 | |
f6705578 | 4735 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4736 | pers->start_reshape == NULL) { |
f6705578 N |
4737 | /* This personality cannot handle reshaping... */ |
4738 | mddev->pers = NULL; | |
4739 | module_put(pers->owner); | |
4740 | return -EINVAL; | |
4741 | } | |
4742 | ||
7dd5e7c3 N |
4743 | if (pers->sync_request) { |
4744 | /* Warn if this is a potentially silly | |
4745 | * configuration. | |
4746 | */ | |
4747 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4748 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4749 | int warned = 0; |
159ec1fc CR |
4750 | |
4751 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4752 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4753 | if (rdev < rdev2 && |
4754 | rdev->bdev->bd_contains == | |
4755 | rdev2->bdev->bd_contains) { | |
4756 | printk(KERN_WARNING | |
4757 | "%s: WARNING: %s appears to be" | |
4758 | " on the same physical disk as" | |
4759 | " %s.\n", | |
4760 | mdname(mddev), | |
4761 | bdevname(rdev->bdev,b), | |
4762 | bdevname(rdev2->bdev,b2)); | |
4763 | warned = 1; | |
4764 | } | |
4765 | } | |
159ec1fc | 4766 | |
7dd5e7c3 N |
4767 | if (warned) |
4768 | printk(KERN_WARNING | |
4769 | "True protection against single-disk" | |
4770 | " failure might be compromised.\n"); | |
4771 | } | |
4772 | ||
657390d2 | 4773 | mddev->recovery = 0; |
58c0fed4 AN |
4774 | /* may be over-ridden by personality */ |
4775 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4776 | ||
6ff8d8ec | 4777 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4778 | |
0f9552b5 | 4779 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4780 | mddev->ro = 2; /* read-only, but switch on first write */ |
4781 | ||
b15c2e57 | 4782 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4783 | if (err) |
4784 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4785 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4786 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4787 | " but 'external_size' not in effect?\n", __func__); | |
4788 | printk(KERN_ERR | |
4789 | "md: invalid array_size %llu > default size %llu\n", | |
4790 | (unsigned long long)mddev->array_sectors / 2, | |
4791 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4792 | err = -EINVAL; | |
4793 | mddev->pers->stop(mddev); | |
4794 | } | |
4795 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4796 | err = bitmap_create(mddev); |
4797 | if (err) { | |
4798 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4799 | mdname(mddev), err); | |
4800 | mddev->pers->stop(mddev); | |
4801 | } | |
4802 | } | |
1da177e4 | 4803 | if (err) { |
1da177e4 LT |
4804 | module_put(mddev->pers->owner); |
4805 | mddev->pers = NULL; | |
32a7627c N |
4806 | bitmap_destroy(mddev); |
4807 | return err; | |
1da177e4 | 4808 | } |
5e55e2f5 | 4809 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4810 | if (mddev->kobj.sd && |
4811 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4812 | printk(KERN_WARNING |
4813 | "md: cannot register extra attributes for %s\n", | |
4814 | mdname(mddev)); | |
00bcb4ac | 4815 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4816 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4817 | mddev->ro = 0; |
4818 | ||
1da177e4 | 4819 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4820 | atomic_set(&mddev->max_corr_read_errors, |
4821 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4822 | mddev->safemode = 0; |
4823 | mddev->safemode_timer.function = md_safemode_timeout; | |
4824 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4825 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4826 | mddev->in_sync = 1; |
0ca69886 N |
4827 | smp_wmb(); |
4828 | mddev->ready = 1; | |
159ec1fc | 4829 | list_for_each_entry(rdev, &mddev->disks, same_set) |
36fad858 NK |
4830 | if (rdev->raid_disk >= 0) |
4831 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 4832 | /* failure here is OK */; |
1da177e4 LT |
4833 | |
4834 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4835 | ||
850b2b42 N |
4836 | if (mddev->flags) |
4837 | md_update_sb(mddev, 0); | |
1da177e4 | 4838 | |
d7603b7e | 4839 | md_new_event(mddev); |
00bcb4ac N |
4840 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4841 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4842 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4843 | return 0; |
4844 | } | |
390ee602 | 4845 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4846 | |
fe60b014 N |
4847 | static int do_md_run(mddev_t *mddev) |
4848 | { | |
4849 | int err; | |
4850 | ||
4851 | err = md_run(mddev); | |
4852 | if (err) | |
4853 | goto out; | |
69e51b44 N |
4854 | err = bitmap_load(mddev); |
4855 | if (err) { | |
4856 | bitmap_destroy(mddev); | |
4857 | goto out; | |
4858 | } | |
0fd018af JB |
4859 | |
4860 | md_wakeup_thread(mddev->thread); | |
4861 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
4862 | ||
fe60b014 N |
4863 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4864 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 4865 | mddev->changed = 1; |
fe60b014 N |
4866 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
4867 | out: | |
4868 | return err; | |
4869 | } | |
4870 | ||
1da177e4 LT |
4871 | static int restart_array(mddev_t *mddev) |
4872 | { | |
4873 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4874 | |
80fab1d7 | 4875 | /* Complain if it has no devices */ |
1da177e4 | 4876 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4877 | return -ENXIO; |
4878 | if (!mddev->pers) | |
4879 | return -EINVAL; | |
4880 | if (!mddev->ro) | |
4881 | return -EBUSY; | |
4882 | mddev->safemode = 0; | |
4883 | mddev->ro = 0; | |
4884 | set_disk_ro(disk, 0); | |
4885 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4886 | mdname(mddev)); | |
4887 | /* Kick recovery or resync if necessary */ | |
4888 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4889 | md_wakeup_thread(mddev->thread); | |
4890 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 4891 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 4892 | return 0; |
1da177e4 LT |
4893 | } |
4894 | ||
acc55e22 N |
4895 | /* similar to deny_write_access, but accounts for our holding a reference |
4896 | * to the file ourselves */ | |
4897 | static int deny_bitmap_write_access(struct file * file) | |
4898 | { | |
4899 | struct inode *inode = file->f_mapping->host; | |
4900 | ||
4901 | spin_lock(&inode->i_lock); | |
4902 | if (atomic_read(&inode->i_writecount) > 1) { | |
4903 | spin_unlock(&inode->i_lock); | |
4904 | return -ETXTBSY; | |
4905 | } | |
4906 | atomic_set(&inode->i_writecount, -1); | |
4907 | spin_unlock(&inode->i_lock); | |
4908 | ||
4909 | return 0; | |
4910 | } | |
4911 | ||
43a70507 | 4912 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4913 | { |
4914 | struct inode *inode = file->f_mapping->host; | |
4915 | ||
4916 | spin_lock(&inode->i_lock); | |
4917 | atomic_set(&inode->i_writecount, 1); | |
4918 | spin_unlock(&inode->i_lock); | |
4919 | } | |
4920 | ||
6177b472 N |
4921 | static void md_clean(mddev_t *mddev) |
4922 | { | |
4923 | mddev->array_sectors = 0; | |
4924 | mddev->external_size = 0; | |
4925 | mddev->dev_sectors = 0; | |
4926 | mddev->raid_disks = 0; | |
4927 | mddev->recovery_cp = 0; | |
4928 | mddev->resync_min = 0; | |
4929 | mddev->resync_max = MaxSector; | |
4930 | mddev->reshape_position = MaxSector; | |
4931 | mddev->external = 0; | |
4932 | mddev->persistent = 0; | |
4933 | mddev->level = LEVEL_NONE; | |
4934 | mddev->clevel[0] = 0; | |
4935 | mddev->flags = 0; | |
4936 | mddev->ro = 0; | |
4937 | mddev->metadata_type[0] = 0; | |
4938 | mddev->chunk_sectors = 0; | |
4939 | mddev->ctime = mddev->utime = 0; | |
4940 | mddev->layout = 0; | |
4941 | mddev->max_disks = 0; | |
4942 | mddev->events = 0; | |
a8707c08 | 4943 | mddev->can_decrease_events = 0; |
6177b472 N |
4944 | mddev->delta_disks = 0; |
4945 | mddev->new_level = LEVEL_NONE; | |
4946 | mddev->new_layout = 0; | |
4947 | mddev->new_chunk_sectors = 0; | |
4948 | mddev->curr_resync = 0; | |
4949 | mddev->resync_mismatches = 0; | |
4950 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4951 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4952 | mddev->recovery = 0; | |
4953 | mddev->in_sync = 0; | |
f0b4f7e2 | 4954 | mddev->changed = 0; |
6177b472 | 4955 | mddev->degraded = 0; |
6177b472 N |
4956 | mddev->safemode = 0; |
4957 | mddev->bitmap_info.offset = 0; | |
4958 | mddev->bitmap_info.default_offset = 0; | |
4959 | mddev->bitmap_info.chunksize = 0; | |
4960 | mddev->bitmap_info.daemon_sleep = 0; | |
4961 | mddev->bitmap_info.max_write_behind = 0; | |
4962 | } | |
4963 | ||
defad61a | 4964 | static void __md_stop_writes(mddev_t *mddev) |
a047e125 N |
4965 | { |
4966 | if (mddev->sync_thread) { | |
4967 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4968 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 4969 | reap_sync_thread(mddev); |
a047e125 N |
4970 | } |
4971 | ||
4972 | del_timer_sync(&mddev->safemode_timer); | |
4973 | ||
4974 | bitmap_flush(mddev); | |
4975 | md_super_wait(mddev); | |
4976 | ||
4977 | if (!mddev->in_sync || mddev->flags) { | |
4978 | /* mark array as shutdown cleanly */ | |
4979 | mddev->in_sync = 1; | |
4980 | md_update_sb(mddev, 1); | |
4981 | } | |
4982 | } | |
defad61a N |
4983 | |
4984 | void md_stop_writes(mddev_t *mddev) | |
4985 | { | |
4986 | mddev_lock(mddev); | |
4987 | __md_stop_writes(mddev); | |
4988 | mddev_unlock(mddev); | |
4989 | } | |
390ee602 | 4990 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 4991 | |
390ee602 | 4992 | void md_stop(mddev_t *mddev) |
6177b472 | 4993 | { |
0ca69886 | 4994 | mddev->ready = 0; |
6177b472 N |
4995 | mddev->pers->stop(mddev); |
4996 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
4997 | mddev->to_remove = &md_redundancy_group; | |
4998 | module_put(mddev->pers->owner); | |
4999 | mddev->pers = NULL; | |
cca9cf90 | 5000 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 5001 | } |
390ee602 | 5002 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 5003 | |
a4bd82d0 N |
5004 | static int md_set_readonly(mddev_t *mddev, int is_open) |
5005 | { | |
5006 | int err = 0; | |
5007 | mutex_lock(&mddev->open_mutex); | |
5008 | if (atomic_read(&mddev->openers) > is_open) { | |
5009 | printk("md: %s still in use.\n",mdname(mddev)); | |
5010 | err = -EBUSY; | |
5011 | goto out; | |
5012 | } | |
5013 | if (mddev->pers) { | |
defad61a | 5014 | __md_stop_writes(mddev); |
a4bd82d0 N |
5015 | |
5016 | err = -ENXIO; | |
5017 | if (mddev->ro==1) | |
5018 | goto out; | |
5019 | mddev->ro = 1; | |
5020 | set_disk_ro(mddev->gendisk, 1); | |
5021 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 5022 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
5023 | err = 0; |
5024 | } | |
5025 | out: | |
5026 | mutex_unlock(&mddev->open_mutex); | |
5027 | return err; | |
5028 | } | |
5029 | ||
9e653b63 N |
5030 | /* mode: |
5031 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
5032 | * 2 - stop but do not disassemble array |
5033 | */ | |
df5b20cf | 5034 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 | 5035 | { |
1da177e4 | 5036 | struct gendisk *disk = mddev->gendisk; |
c4647292 | 5037 | mdk_rdev_t *rdev; |
1da177e4 | 5038 | |
c8c00a69 | 5039 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
5040 | if (atomic_read(&mddev->openers) > is_open || |
5041 | mddev->sysfs_active) { | |
df5b20cf | 5042 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
5043 | mutex_unlock(&mddev->open_mutex); |
5044 | return -EBUSY; | |
5045 | } | |
1da177e4 | 5046 | |
6e17b027 | 5047 | if (mddev->pers) { |
a4bd82d0 N |
5048 | if (mddev->ro) |
5049 | set_disk_ro(disk, 0); | |
409c57f3 | 5050 | |
defad61a | 5051 | __md_stop_writes(mddev); |
a4bd82d0 N |
5052 | md_stop(mddev); |
5053 | mddev->queue->merge_bvec_fn = NULL; | |
a4bd82d0 | 5054 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 5055 | |
a4bd82d0 | 5056 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 5057 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 5058 | |
a4bd82d0 | 5059 | list_for_each_entry(rdev, &mddev->disks, same_set) |
36fad858 NK |
5060 | if (rdev->raid_disk >= 0) |
5061 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 5062 | |
a4bd82d0 | 5063 | set_capacity(disk, 0); |
6e17b027 | 5064 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5065 | mddev->changed = 1; |
a4bd82d0 | 5066 | revalidate_disk(disk); |
0d4ca600 | 5067 | |
a4bd82d0 N |
5068 | if (mddev->ro) |
5069 | mddev->ro = 0; | |
6e17b027 N |
5070 | } else |
5071 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5072 | /* |
5073 | * Free resources if final stop | |
5074 | */ | |
9e653b63 | 5075 | if (mode == 0) { |
1da177e4 LT |
5076 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5077 | ||
978f946b | 5078 | bitmap_destroy(mddev); |
c3d9714e N |
5079 | if (mddev->bitmap_info.file) { |
5080 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5081 | fput(mddev->bitmap_info.file); | |
5082 | mddev->bitmap_info.file = NULL; | |
978f946b | 5083 | } |
c3d9714e | 5084 | mddev->bitmap_info.offset = 0; |
978f946b | 5085 | |
1da177e4 LT |
5086 | export_array(mddev); |
5087 | ||
6177b472 | 5088 | md_clean(mddev); |
934d9c23 | 5089 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5090 | if (mddev->hold_active == UNTIL_STOP) |
5091 | mddev->hold_active = 0; | |
a4bd82d0 | 5092 | } |
3f9d99c1 | 5093 | blk_integrity_unregister(disk); |
d7603b7e | 5094 | md_new_event(mddev); |
00bcb4ac | 5095 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5096 | return 0; |
1da177e4 LT |
5097 | } |
5098 | ||
fdee8ae4 | 5099 | #ifndef MODULE |
1da177e4 LT |
5100 | static void autorun_array(mddev_t *mddev) |
5101 | { | |
5102 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5103 | int err; |
5104 | ||
a757e64c | 5105 | if (list_empty(&mddev->disks)) |
1da177e4 | 5106 | return; |
1da177e4 LT |
5107 | |
5108 | printk(KERN_INFO "md: running: "); | |
5109 | ||
159ec1fc | 5110 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5111 | char b[BDEVNAME_SIZE]; |
5112 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5113 | } | |
5114 | printk("\n"); | |
5115 | ||
d710e138 | 5116 | err = do_md_run(mddev); |
1da177e4 LT |
5117 | if (err) { |
5118 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 5119 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
5120 | } |
5121 | } | |
5122 | ||
5123 | /* | |
5124 | * lets try to run arrays based on all disks that have arrived | |
5125 | * until now. (those are in pending_raid_disks) | |
5126 | * | |
5127 | * the method: pick the first pending disk, collect all disks with | |
5128 | * the same UUID, remove all from the pending list and put them into | |
5129 | * the 'same_array' list. Then order this list based on superblock | |
5130 | * update time (freshest comes first), kick out 'old' disks and | |
5131 | * compare superblocks. If everything's fine then run it. | |
5132 | * | |
5133 | * If "unit" is allocated, then bump its reference count | |
5134 | */ | |
5135 | static void autorun_devices(int part) | |
5136 | { | |
159ec1fc | 5137 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
5138 | mddev_t *mddev; |
5139 | char b[BDEVNAME_SIZE]; | |
5140 | ||
5141 | printk(KERN_INFO "md: autorun ...\n"); | |
5142 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5143 | int unit; |
1da177e4 | 5144 | dev_t dev; |
ad01c9e3 | 5145 | LIST_HEAD(candidates); |
1da177e4 LT |
5146 | rdev0 = list_entry(pending_raid_disks.next, |
5147 | mdk_rdev_t, same_set); | |
5148 | ||
5149 | printk(KERN_INFO "md: considering %s ...\n", | |
5150 | bdevname(rdev0->bdev,b)); | |
5151 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5152 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5153 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5154 | printk(KERN_INFO "md: adding %s ...\n", | |
5155 | bdevname(rdev->bdev,b)); | |
5156 | list_move(&rdev->same_set, &candidates); | |
5157 | } | |
5158 | /* | |
5159 | * now we have a set of devices, with all of them having | |
5160 | * mostly sane superblocks. It's time to allocate the | |
5161 | * mddev. | |
5162 | */ | |
e8703fe1 N |
5163 | if (part) { |
5164 | dev = MKDEV(mdp_major, | |
5165 | rdev0->preferred_minor << MdpMinorShift); | |
5166 | unit = MINOR(dev) >> MdpMinorShift; | |
5167 | } else { | |
5168 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5169 | unit = MINOR(dev); | |
5170 | } | |
5171 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5172 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5173 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5174 | break; | |
5175 | } | |
1da177e4 LT |
5176 | |
5177 | md_probe(dev, NULL, NULL); | |
5178 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5179 | if (!mddev || !mddev->gendisk) { |
5180 | if (mddev) | |
5181 | mddev_put(mddev); | |
5182 | printk(KERN_ERR | |
1da177e4 LT |
5183 | "md: cannot allocate memory for md drive.\n"); |
5184 | break; | |
5185 | } | |
5186 | if (mddev_lock(mddev)) | |
5187 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
5188 | mdname(mddev)); | |
5189 | else if (mddev->raid_disks || mddev->major_version | |
5190 | || !list_empty(&mddev->disks)) { | |
5191 | printk(KERN_WARNING | |
5192 | "md: %s already running, cannot run %s\n", | |
5193 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5194 | mddev_unlock(mddev); | |
5195 | } else { | |
5196 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5197 | mddev->persistent = 1; |
159ec1fc | 5198 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5199 | list_del_init(&rdev->same_set); |
5200 | if (bind_rdev_to_array(rdev, mddev)) | |
5201 | export_rdev(rdev); | |
5202 | } | |
5203 | autorun_array(mddev); | |
5204 | mddev_unlock(mddev); | |
5205 | } | |
5206 | /* on success, candidates will be empty, on error | |
5207 | * it won't... | |
5208 | */ | |
159ec1fc | 5209 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5210 | list_del_init(&rdev->same_set); |
1da177e4 | 5211 | export_rdev(rdev); |
4b80991c | 5212 | } |
1da177e4 LT |
5213 | mddev_put(mddev); |
5214 | } | |
5215 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5216 | } | |
fdee8ae4 | 5217 | #endif /* !MODULE */ |
1da177e4 | 5218 | |
1da177e4 LT |
5219 | static int get_version(void __user * arg) |
5220 | { | |
5221 | mdu_version_t ver; | |
5222 | ||
5223 | ver.major = MD_MAJOR_VERSION; | |
5224 | ver.minor = MD_MINOR_VERSION; | |
5225 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5226 | ||
5227 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5228 | return -EFAULT; | |
5229 | ||
5230 | return 0; | |
5231 | } | |
5232 | ||
5233 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
5234 | { | |
5235 | mdu_array_info_t info; | |
a9f326eb | 5236 | int nr,working,insync,failed,spare; |
1da177e4 | 5237 | mdk_rdev_t *rdev; |
1da177e4 | 5238 | |
a9f326eb | 5239 | nr=working=insync=failed=spare=0; |
159ec1fc | 5240 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 5241 | nr++; |
b2d444d7 | 5242 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5243 | failed++; |
5244 | else { | |
5245 | working++; | |
b2d444d7 | 5246 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 5247 | insync++; |
1da177e4 LT |
5248 | else |
5249 | spare++; | |
5250 | } | |
5251 | } | |
5252 | ||
5253 | info.major_version = mddev->major_version; | |
5254 | info.minor_version = mddev->minor_version; | |
5255 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5256 | info.ctime = mddev->ctime; | |
5257 | info.level = mddev->level; | |
58c0fed4 AN |
5258 | info.size = mddev->dev_sectors / 2; |
5259 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5260 | info.size = -1; |
1da177e4 LT |
5261 | info.nr_disks = nr; |
5262 | info.raid_disks = mddev->raid_disks; | |
5263 | info.md_minor = mddev->md_minor; | |
5264 | info.not_persistent= !mddev->persistent; | |
5265 | ||
5266 | info.utime = mddev->utime; | |
5267 | info.state = 0; | |
5268 | if (mddev->in_sync) | |
5269 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5270 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5271 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5272 | info.active_disks = insync; |
1da177e4 LT |
5273 | info.working_disks = working; |
5274 | info.failed_disks = failed; | |
5275 | info.spare_disks = spare; | |
5276 | ||
5277 | info.layout = mddev->layout; | |
9d8f0363 | 5278 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5279 | |
5280 | if (copy_to_user(arg, &info, sizeof(info))) | |
5281 | return -EFAULT; | |
5282 | ||
5283 | return 0; | |
5284 | } | |
5285 | ||
87162a28 | 5286 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
5287 | { |
5288 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5289 | char *ptr, *buf = NULL; | |
5290 | int err = -ENOMEM; | |
5291 | ||
b5470dc5 DW |
5292 | if (md_allow_write(mddev)) |
5293 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5294 | else | |
5295 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5296 | |
32a7627c N |
5297 | if (!file) |
5298 | goto out; | |
5299 | ||
5300 | /* bitmap disabled, zero the first byte and copy out */ | |
5301 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
5302 | file->pathname[0] = '\0'; | |
5303 | goto copy_out; | |
5304 | } | |
5305 | ||
5306 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5307 | if (!buf) | |
5308 | goto out; | |
5309 | ||
6bcfd601 CH |
5310 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
5311 | if (IS_ERR(ptr)) | |
32a7627c N |
5312 | goto out; |
5313 | ||
5314 | strcpy(file->pathname, ptr); | |
5315 | ||
5316 | copy_out: | |
5317 | err = 0; | |
5318 | if (copy_to_user(arg, file, sizeof(*file))) | |
5319 | err = -EFAULT; | |
5320 | out: | |
5321 | kfree(buf); | |
5322 | kfree(file); | |
5323 | return err; | |
5324 | } | |
5325 | ||
1da177e4 LT |
5326 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
5327 | { | |
5328 | mdu_disk_info_t info; | |
1da177e4 LT |
5329 | mdk_rdev_t *rdev; |
5330 | ||
5331 | if (copy_from_user(&info, arg, sizeof(info))) | |
5332 | return -EFAULT; | |
5333 | ||
26ef379f | 5334 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5335 | if (rdev) { |
5336 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5337 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5338 | info.raid_disk = rdev->raid_disk; | |
5339 | info.state = 0; | |
b2d444d7 | 5340 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5341 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5342 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5343 | info.state |= (1<<MD_DISK_ACTIVE); |
5344 | info.state |= (1<<MD_DISK_SYNC); | |
5345 | } | |
8ddf9efe N |
5346 | if (test_bit(WriteMostly, &rdev->flags)) |
5347 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5348 | } else { |
5349 | info.major = info.minor = 0; | |
5350 | info.raid_disk = -1; | |
5351 | info.state = (1<<MD_DISK_REMOVED); | |
5352 | } | |
5353 | ||
5354 | if (copy_to_user(arg, &info, sizeof(info))) | |
5355 | return -EFAULT; | |
5356 | ||
5357 | return 0; | |
5358 | } | |
5359 | ||
5360 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
5361 | { | |
5362 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
5363 | mdk_rdev_t *rdev; | |
5364 | dev_t dev = MKDEV(info->major,info->minor); | |
5365 | ||
5366 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5367 | return -EOVERFLOW; | |
5368 | ||
5369 | if (!mddev->raid_disks) { | |
5370 | int err; | |
5371 | /* expecting a device which has a superblock */ | |
5372 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5373 | if (IS_ERR(rdev)) { | |
5374 | printk(KERN_WARNING | |
5375 | "md: md_import_device returned %ld\n", | |
5376 | PTR_ERR(rdev)); | |
5377 | return PTR_ERR(rdev); | |
5378 | } | |
5379 | if (!list_empty(&mddev->disks)) { | |
5380 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
5381 | mdk_rdev_t, same_set); | |
a9f326eb | 5382 | err = super_types[mddev->major_version] |
1da177e4 LT |
5383 | .load_super(rdev, rdev0, mddev->minor_version); |
5384 | if (err < 0) { | |
5385 | printk(KERN_WARNING | |
5386 | "md: %s has different UUID to %s\n", | |
5387 | bdevname(rdev->bdev,b), | |
5388 | bdevname(rdev0->bdev,b2)); | |
5389 | export_rdev(rdev); | |
5390 | return -EINVAL; | |
5391 | } | |
5392 | } | |
5393 | err = bind_rdev_to_array(rdev, mddev); | |
5394 | if (err) | |
5395 | export_rdev(rdev); | |
5396 | return err; | |
5397 | } | |
5398 | ||
5399 | /* | |
5400 | * add_new_disk can be used once the array is assembled | |
5401 | * to add "hot spares". They must already have a superblock | |
5402 | * written | |
5403 | */ | |
5404 | if (mddev->pers) { | |
5405 | int err; | |
5406 | if (!mddev->pers->hot_add_disk) { | |
5407 | printk(KERN_WARNING | |
5408 | "%s: personality does not support diskops!\n", | |
5409 | mdname(mddev)); | |
5410 | return -EINVAL; | |
5411 | } | |
7b1e35f6 N |
5412 | if (mddev->persistent) |
5413 | rdev = md_import_device(dev, mddev->major_version, | |
5414 | mddev->minor_version); | |
5415 | else | |
5416 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5417 | if (IS_ERR(rdev)) { |
5418 | printk(KERN_WARNING | |
5419 | "md: md_import_device returned %ld\n", | |
5420 | PTR_ERR(rdev)); | |
5421 | return PTR_ERR(rdev); | |
5422 | } | |
1a855a06 | 5423 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5424 | if (!mddev->persistent) { |
5425 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5426 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5427 | rdev->raid_disk = info->raid_disk; |
bf572541 N |
5428 | set_bit(In_sync, &rdev->flags); |
5429 | } else | |
41158c7e N |
5430 | rdev->raid_disk = -1; |
5431 | } else | |
5432 | super_types[mddev->major_version]. | |
5433 | validate_super(mddev, rdev); | |
bedd86b7 N |
5434 | if ((info->state & (1<<MD_DISK_SYNC)) && |
5435 | (!test_bit(In_sync, &rdev->flags) || | |
5436 | rdev->raid_disk != info->raid_disk)) { | |
5437 | /* This was a hot-add request, but events doesn't | |
5438 | * match, so reject it. | |
5439 | */ | |
5440 | export_rdev(rdev); | |
5441 | return -EINVAL; | |
5442 | } | |
5443 | ||
1a855a06 N |
5444 | if (test_bit(In_sync, &rdev->flags)) |
5445 | rdev->saved_raid_disk = rdev->raid_disk; | |
5446 | else | |
5447 | rdev->saved_raid_disk = -1; | |
41158c7e | 5448 | |
b2d444d7 | 5449 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5450 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5451 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5452 | else |
5453 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5454 | |
1da177e4 LT |
5455 | rdev->raid_disk = -1; |
5456 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5457 | if (!err && !mddev->pers->hot_remove_disk) { |
5458 | /* If there is hot_add_disk but no hot_remove_disk | |
5459 | * then added disks for geometry changes, | |
5460 | * and should be added immediately. | |
5461 | */ | |
5462 | super_types[mddev->major_version]. | |
5463 | validate_super(mddev, rdev); | |
5464 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5465 | if (err) | |
5466 | unbind_rdev_from_array(rdev); | |
5467 | } | |
1da177e4 LT |
5468 | if (err) |
5469 | export_rdev(rdev); | |
52664732 | 5470 | else |
00bcb4ac | 5471 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5472 | |
17571284 | 5473 | md_update_sb(mddev, 1); |
72a23c21 NB |
5474 | if (mddev->degraded) |
5475 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5476 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5477 | if (!err) |
5478 | md_new_event(mddev); | |
005eca5e | 5479 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5480 | return err; |
5481 | } | |
5482 | ||
5483 | /* otherwise, add_new_disk is only allowed | |
5484 | * for major_version==0 superblocks | |
5485 | */ | |
5486 | if (mddev->major_version != 0) { | |
5487 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5488 | mdname(mddev)); | |
5489 | return -EINVAL; | |
5490 | } | |
5491 | ||
5492 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5493 | int err; | |
d710e138 | 5494 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5495 | if (IS_ERR(rdev)) { |
5496 | printk(KERN_WARNING | |
5497 | "md: error, md_import_device() returned %ld\n", | |
5498 | PTR_ERR(rdev)); | |
5499 | return PTR_ERR(rdev); | |
5500 | } | |
5501 | rdev->desc_nr = info->number; | |
5502 | if (info->raid_disk < mddev->raid_disks) | |
5503 | rdev->raid_disk = info->raid_disk; | |
5504 | else | |
5505 | rdev->raid_disk = -1; | |
5506 | ||
1da177e4 | 5507 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5508 | if (info->state & (1<<MD_DISK_SYNC)) |
5509 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5510 | |
8ddf9efe N |
5511 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5512 | set_bit(WriteMostly, &rdev->flags); | |
5513 | ||
1da177e4 LT |
5514 | if (!mddev->persistent) { |
5515 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5516 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5517 | } else | |
57b2caa3 | 5518 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5519 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5520 | |
2bf071bf N |
5521 | err = bind_rdev_to_array(rdev, mddev); |
5522 | if (err) { | |
5523 | export_rdev(rdev); | |
5524 | return err; | |
5525 | } | |
1da177e4 LT |
5526 | } |
5527 | ||
5528 | return 0; | |
5529 | } | |
5530 | ||
5531 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5532 | { | |
5533 | char b[BDEVNAME_SIZE]; | |
5534 | mdk_rdev_t *rdev; | |
5535 | ||
1da177e4 LT |
5536 | rdev = find_rdev(mddev, dev); |
5537 | if (!rdev) | |
5538 | return -ENXIO; | |
5539 | ||
5540 | if (rdev->raid_disk >= 0) | |
5541 | goto busy; | |
5542 | ||
5543 | kick_rdev_from_array(rdev); | |
850b2b42 | 5544 | md_update_sb(mddev, 1); |
d7603b7e | 5545 | md_new_event(mddev); |
1da177e4 LT |
5546 | |
5547 | return 0; | |
5548 | busy: | |
fdefa4d8 | 5549 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5550 | bdevname(rdev->bdev,b), mdname(mddev)); |
5551 | return -EBUSY; | |
5552 | } | |
5553 | ||
5554 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5555 | { | |
5556 | char b[BDEVNAME_SIZE]; | |
5557 | int err; | |
1da177e4 LT |
5558 | mdk_rdev_t *rdev; |
5559 | ||
5560 | if (!mddev->pers) | |
5561 | return -ENODEV; | |
5562 | ||
5563 | if (mddev->major_version != 0) { | |
5564 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5565 | " version-0 superblocks.\n", | |
5566 | mdname(mddev)); | |
5567 | return -EINVAL; | |
5568 | } | |
5569 | if (!mddev->pers->hot_add_disk) { | |
5570 | printk(KERN_WARNING | |
5571 | "%s: personality does not support diskops!\n", | |
5572 | mdname(mddev)); | |
5573 | return -EINVAL; | |
5574 | } | |
5575 | ||
d710e138 | 5576 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5577 | if (IS_ERR(rdev)) { |
5578 | printk(KERN_WARNING | |
5579 | "md: error, md_import_device() returned %ld\n", | |
5580 | PTR_ERR(rdev)); | |
5581 | return -EINVAL; | |
5582 | } | |
5583 | ||
5584 | if (mddev->persistent) | |
57b2caa3 | 5585 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5586 | else |
77304d2a | 5587 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5588 | |
8190e754 | 5589 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5590 | |
b2d444d7 | 5591 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5592 | printk(KERN_WARNING |
5593 | "md: can not hot-add faulty %s disk to %s!\n", | |
5594 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5595 | err = -EINVAL; | |
5596 | goto abort_export; | |
5597 | } | |
b2d444d7 | 5598 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5599 | rdev->desc_nr = -1; |
5842730d | 5600 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5601 | err = bind_rdev_to_array(rdev, mddev); |
5602 | if (err) | |
5603 | goto abort_export; | |
1da177e4 LT |
5604 | |
5605 | /* | |
5606 | * The rest should better be atomic, we can have disk failures | |
5607 | * noticed in interrupt contexts ... | |
5608 | */ | |
5609 | ||
1da177e4 LT |
5610 | rdev->raid_disk = -1; |
5611 | ||
850b2b42 | 5612 | md_update_sb(mddev, 1); |
1da177e4 LT |
5613 | |
5614 | /* | |
5615 | * Kick recovery, maybe this spare has to be added to the | |
5616 | * array immediately. | |
5617 | */ | |
5618 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5619 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5620 | md_new_event(mddev); |
1da177e4 LT |
5621 | return 0; |
5622 | ||
1da177e4 LT |
5623 | abort_export: |
5624 | export_rdev(rdev); | |
5625 | return err; | |
5626 | } | |
5627 | ||
32a7627c N |
5628 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5629 | { | |
5630 | int err; | |
5631 | ||
36fa3063 N |
5632 | if (mddev->pers) { |
5633 | if (!mddev->pers->quiesce) | |
5634 | return -EBUSY; | |
5635 | if (mddev->recovery || mddev->sync_thread) | |
5636 | return -EBUSY; | |
5637 | /* we should be able to change the bitmap.. */ | |
5638 | } | |
32a7627c | 5639 | |
32a7627c | 5640 | |
36fa3063 N |
5641 | if (fd >= 0) { |
5642 | if (mddev->bitmap) | |
5643 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5644 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5645 | |
c3d9714e | 5646 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5647 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5648 | mdname(mddev)); | |
5649 | return -EBADF; | |
5650 | } | |
5651 | ||
c3d9714e | 5652 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5653 | if (err) { |
5654 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5655 | mdname(mddev)); | |
c3d9714e N |
5656 | fput(mddev->bitmap_info.file); |
5657 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5658 | return err; |
5659 | } | |
c3d9714e | 5660 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5661 | } else if (mddev->bitmap == NULL) |
5662 | return -ENOENT; /* cannot remove what isn't there */ | |
5663 | err = 0; | |
5664 | if (mddev->pers) { | |
5665 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5666 | if (fd >= 0) { |
36fa3063 | 5667 | err = bitmap_create(mddev); |
69e51b44 N |
5668 | if (!err) |
5669 | err = bitmap_load(mddev); | |
5670 | } | |
d7375ab3 | 5671 | if (fd < 0 || err) { |
36fa3063 | 5672 | bitmap_destroy(mddev); |
d7375ab3 N |
5673 | fd = -1; /* make sure to put the file */ |
5674 | } | |
36fa3063 | 5675 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5676 | } |
5677 | if (fd < 0) { | |
c3d9714e N |
5678 | if (mddev->bitmap_info.file) { |
5679 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5680 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5681 | } |
c3d9714e | 5682 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5683 | } |
5684 | ||
32a7627c N |
5685 | return err; |
5686 | } | |
5687 | ||
1da177e4 LT |
5688 | /* |
5689 | * set_array_info is used two different ways | |
5690 | * The original usage is when creating a new array. | |
5691 | * In this usage, raid_disks is > 0 and it together with | |
5692 | * level, size, not_persistent,layout,chunksize determine the | |
5693 | * shape of the array. | |
5694 | * This will always create an array with a type-0.90.0 superblock. | |
5695 | * The newer usage is when assembling an array. | |
5696 | * In this case raid_disks will be 0, and the major_version field is | |
5697 | * use to determine which style super-blocks are to be found on the devices. | |
5698 | * The minor and patch _version numbers are also kept incase the | |
5699 | * super_block handler wishes to interpret them. | |
5700 | */ | |
5701 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5702 | { | |
5703 | ||
5704 | if (info->raid_disks == 0) { | |
5705 | /* just setting version number for superblock loading */ | |
5706 | if (info->major_version < 0 || | |
50511da3 | 5707 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5708 | super_types[info->major_version].name == NULL) { |
5709 | /* maybe try to auto-load a module? */ | |
5710 | printk(KERN_INFO | |
5711 | "md: superblock version %d not known\n", | |
5712 | info->major_version); | |
5713 | return -EINVAL; | |
5714 | } | |
5715 | mddev->major_version = info->major_version; | |
5716 | mddev->minor_version = info->minor_version; | |
5717 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5718 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5719 | /* ensure mddev_put doesn't delete this now that there |
5720 | * is some minimal configuration. | |
5721 | */ | |
5722 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5723 | return 0; |
5724 | } | |
5725 | mddev->major_version = MD_MAJOR_VERSION; | |
5726 | mddev->minor_version = MD_MINOR_VERSION; | |
5727 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5728 | mddev->ctime = get_seconds(); | |
5729 | ||
5730 | mddev->level = info->level; | |
17115e03 | 5731 | mddev->clevel[0] = 0; |
58c0fed4 | 5732 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5733 | mddev->raid_disks = info->raid_disks; |
5734 | /* don't set md_minor, it is determined by which /dev/md* was | |
5735 | * openned | |
5736 | */ | |
5737 | if (info->state & (1<<MD_SB_CLEAN)) | |
5738 | mddev->recovery_cp = MaxSector; | |
5739 | else | |
5740 | mddev->recovery_cp = 0; | |
5741 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5742 | mddev->external = 0; |
1da177e4 LT |
5743 | |
5744 | mddev->layout = info->layout; | |
9d8f0363 | 5745 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5746 | |
5747 | mddev->max_disks = MD_SB_DISKS; | |
5748 | ||
e691063a N |
5749 | if (mddev->persistent) |
5750 | mddev->flags = 0; | |
850b2b42 | 5751 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5752 | |
c3d9714e N |
5753 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5754 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5755 | |
f6705578 N |
5756 | mddev->reshape_position = MaxSector; |
5757 | ||
1da177e4 LT |
5758 | /* |
5759 | * Generate a 128 bit UUID | |
5760 | */ | |
5761 | get_random_bytes(mddev->uuid, 16); | |
5762 | ||
f6705578 | 5763 | mddev->new_level = mddev->level; |
664e7c41 | 5764 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5765 | mddev->new_layout = mddev->layout; |
5766 | mddev->delta_disks = 0; | |
5767 | ||
1da177e4 LT |
5768 | return 0; |
5769 | } | |
5770 | ||
1f403624 DW |
5771 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5772 | { | |
b522adcd DW |
5773 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5774 | ||
5775 | if (mddev->external_size) | |
5776 | return; | |
5777 | ||
1f403624 DW |
5778 | mddev->array_sectors = array_sectors; |
5779 | } | |
5780 | EXPORT_SYMBOL(md_set_array_sectors); | |
5781 | ||
d71f9f88 | 5782 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5783 | { |
159ec1fc | 5784 | mdk_rdev_t *rdev; |
a35b0d69 | 5785 | int rv; |
d71f9f88 | 5786 | int fit = (num_sectors == 0); |
a35b0d69 N |
5787 | |
5788 | if (mddev->pers->resize == NULL) | |
5789 | return -EINVAL; | |
d71f9f88 AN |
5790 | /* The "num_sectors" is the number of sectors of each device that |
5791 | * is used. This can only make sense for arrays with redundancy. | |
5792 | * linear and raid0 always use whatever space is available. We can only | |
5793 | * consider changing this number if no resync or reconstruction is | |
5794 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5795 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5796 | * of each device. If num_sectors is zero, we find the largest size |
5797 | * that fits. | |
a35b0d69 N |
5798 | */ |
5799 | if (mddev->sync_thread) | |
5800 | return -EBUSY; | |
dba034ee N |
5801 | if (mddev->bitmap) |
5802 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5803 | * grow, and re-add. | |
5804 | */ | |
5805 | return -EBUSY; | |
159ec1fc | 5806 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5807 | sector_t avail = rdev->sectors; |
01ab5662 | 5808 | |
d71f9f88 AN |
5809 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5810 | num_sectors = avail; | |
5811 | if (avail < num_sectors) | |
a35b0d69 N |
5812 | return -ENOSPC; |
5813 | } | |
d71f9f88 | 5814 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5815 | if (!rv) |
5816 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5817 | return rv; |
5818 | } | |
5819 | ||
da943b99 N |
5820 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5821 | { | |
5822 | int rv; | |
5823 | /* change the number of raid disks */ | |
63c70c4f | 5824 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5825 | return -EINVAL; |
5826 | if (raid_disks <= 0 || | |
233fca36 | 5827 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5828 | return -EINVAL; |
63c70c4f | 5829 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5830 | return -EBUSY; |
63c70c4f N |
5831 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5832 | ||
5833 | rv = mddev->pers->check_reshape(mddev); | |
de171cb9 N |
5834 | if (rv < 0) |
5835 | mddev->delta_disks = 0; | |
da943b99 N |
5836 | return rv; |
5837 | } | |
5838 | ||
5839 | ||
1da177e4 LT |
5840 | /* |
5841 | * update_array_info is used to change the configuration of an | |
5842 | * on-line array. | |
5843 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5844 | * fields in the info are checked against the array. | |
5845 | * Any differences that cannot be handled will cause an error. | |
5846 | * Normally, only one change can be managed at a time. | |
5847 | */ | |
5848 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5849 | { | |
5850 | int rv = 0; | |
5851 | int cnt = 0; | |
36fa3063 N |
5852 | int state = 0; |
5853 | ||
5854 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5855 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5856 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5857 | |
5858 | if (mddev->major_version != info->major_version || | |
5859 | mddev->minor_version != info->minor_version || | |
5860 | /* mddev->patch_version != info->patch_version || */ | |
5861 | mddev->ctime != info->ctime || | |
5862 | mddev->level != info->level || | |
5863 | /* mddev->layout != info->layout || */ | |
5864 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5865 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5866 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5867 | ((state^info->state) & 0xfffffe00) | |
5868 | ) | |
1da177e4 LT |
5869 | return -EINVAL; |
5870 | /* Check there is only one change */ | |
58c0fed4 AN |
5871 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5872 | cnt++; | |
5873 | if (mddev->raid_disks != info->raid_disks) | |
5874 | cnt++; | |
5875 | if (mddev->layout != info->layout) | |
5876 | cnt++; | |
5877 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5878 | cnt++; | |
5879 | if (cnt == 0) | |
5880 | return 0; | |
5881 | if (cnt > 1) | |
5882 | return -EINVAL; | |
1da177e4 LT |
5883 | |
5884 | if (mddev->layout != info->layout) { | |
5885 | /* Change layout | |
5886 | * we don't need to do anything at the md level, the | |
5887 | * personality will take care of it all. | |
5888 | */ | |
50ac168a | 5889 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5890 | return -EINVAL; |
597a711b N |
5891 | else { |
5892 | mddev->new_layout = info->layout; | |
50ac168a | 5893 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5894 | if (rv) |
5895 | mddev->new_layout = mddev->layout; | |
5896 | return rv; | |
5897 | } | |
1da177e4 | 5898 | } |
58c0fed4 | 5899 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5900 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5901 | |
da943b99 N |
5902 | if (mddev->raid_disks != info->raid_disks) |
5903 | rv = update_raid_disks(mddev, info->raid_disks); | |
5904 | ||
36fa3063 N |
5905 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5906 | if (mddev->pers->quiesce == NULL) | |
5907 | return -EINVAL; | |
5908 | if (mddev->recovery || mddev->sync_thread) | |
5909 | return -EBUSY; | |
5910 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5911 | /* add the bitmap */ | |
5912 | if (mddev->bitmap) | |
5913 | return -EEXIST; | |
c3d9714e | 5914 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5915 | return -EINVAL; |
c3d9714e N |
5916 | mddev->bitmap_info.offset = |
5917 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5918 | mddev->pers->quiesce(mddev, 1); |
5919 | rv = bitmap_create(mddev); | |
69e51b44 N |
5920 | if (!rv) |
5921 | rv = bitmap_load(mddev); | |
36fa3063 N |
5922 | if (rv) |
5923 | bitmap_destroy(mddev); | |
5924 | mddev->pers->quiesce(mddev, 0); | |
5925 | } else { | |
5926 | /* remove the bitmap */ | |
5927 | if (!mddev->bitmap) | |
5928 | return -ENOENT; | |
5929 | if (mddev->bitmap->file) | |
5930 | return -EINVAL; | |
5931 | mddev->pers->quiesce(mddev, 1); | |
5932 | bitmap_destroy(mddev); | |
5933 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5934 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5935 | } |
5936 | } | |
850b2b42 | 5937 | md_update_sb(mddev, 1); |
1da177e4 LT |
5938 | return rv; |
5939 | } | |
5940 | ||
5941 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5942 | { | |
5943 | mdk_rdev_t *rdev; | |
5944 | ||
5945 | if (mddev->pers == NULL) | |
5946 | return -ENODEV; | |
5947 | ||
5948 | rdev = find_rdev(mddev, dev); | |
5949 | if (!rdev) | |
5950 | return -ENODEV; | |
5951 | ||
5952 | md_error(mddev, rdev); | |
5953 | return 0; | |
5954 | } | |
5955 | ||
2f9618ce AN |
5956 | /* |
5957 | * We have a problem here : there is no easy way to give a CHS | |
5958 | * virtual geometry. We currently pretend that we have a 2 heads | |
5959 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5960 | * dosfs just mad... ;-) | |
5961 | */ | |
a885c8c4 CH |
5962 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5963 | { | |
5964 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5965 | ||
5966 | geo->heads = 2; | |
5967 | geo->sectors = 4; | |
49ce6cea | 5968 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
5969 | return 0; |
5970 | } | |
5971 | ||
a39907fa | 5972 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5973 | unsigned int cmd, unsigned long arg) |
5974 | { | |
5975 | int err = 0; | |
5976 | void __user *argp = (void __user *)arg; | |
1da177e4 | 5977 | mddev_t *mddev = NULL; |
e2218350 | 5978 | int ro; |
1da177e4 LT |
5979 | |
5980 | if (!capable(CAP_SYS_ADMIN)) | |
5981 | return -EACCES; | |
5982 | ||
5983 | /* | |
5984 | * Commands dealing with the RAID driver but not any | |
5985 | * particular array: | |
5986 | */ | |
5987 | switch (cmd) | |
5988 | { | |
5989 | case RAID_VERSION: | |
5990 | err = get_version(argp); | |
5991 | goto done; | |
5992 | ||
5993 | case PRINT_RAID_DEBUG: | |
5994 | err = 0; | |
5995 | md_print_devices(); | |
5996 | goto done; | |
5997 | ||
5998 | #ifndef MODULE | |
5999 | case RAID_AUTORUN: | |
6000 | err = 0; | |
6001 | autostart_arrays(arg); | |
6002 | goto done; | |
6003 | #endif | |
6004 | default:; | |
6005 | } | |
6006 | ||
6007 | /* | |
6008 | * Commands creating/starting a new array: | |
6009 | */ | |
6010 | ||
a39907fa | 6011 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
6012 | |
6013 | if (!mddev) { | |
6014 | BUG(); | |
6015 | goto abort; | |
6016 | } | |
6017 | ||
1da177e4 LT |
6018 | err = mddev_lock(mddev); |
6019 | if (err) { | |
6020 | printk(KERN_INFO | |
6021 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
6022 | err, cmd); | |
6023 | goto abort; | |
6024 | } | |
6025 | ||
6026 | switch (cmd) | |
6027 | { | |
6028 | case SET_ARRAY_INFO: | |
6029 | { | |
6030 | mdu_array_info_t info; | |
6031 | if (!arg) | |
6032 | memset(&info, 0, sizeof(info)); | |
6033 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
6034 | err = -EFAULT; | |
6035 | goto abort_unlock; | |
6036 | } | |
6037 | if (mddev->pers) { | |
6038 | err = update_array_info(mddev, &info); | |
6039 | if (err) { | |
6040 | printk(KERN_WARNING "md: couldn't update" | |
6041 | " array info. %d\n", err); | |
6042 | goto abort_unlock; | |
6043 | } | |
6044 | goto done_unlock; | |
6045 | } | |
6046 | if (!list_empty(&mddev->disks)) { | |
6047 | printk(KERN_WARNING | |
6048 | "md: array %s already has disks!\n", | |
6049 | mdname(mddev)); | |
6050 | err = -EBUSY; | |
6051 | goto abort_unlock; | |
6052 | } | |
6053 | if (mddev->raid_disks) { | |
6054 | printk(KERN_WARNING | |
6055 | "md: array %s already initialised!\n", | |
6056 | mdname(mddev)); | |
6057 | err = -EBUSY; | |
6058 | goto abort_unlock; | |
6059 | } | |
6060 | err = set_array_info(mddev, &info); | |
6061 | if (err) { | |
6062 | printk(KERN_WARNING "md: couldn't set" | |
6063 | " array info. %d\n", err); | |
6064 | goto abort_unlock; | |
6065 | } | |
6066 | } | |
6067 | goto done_unlock; | |
6068 | ||
6069 | default:; | |
6070 | } | |
6071 | ||
6072 | /* | |
6073 | * Commands querying/configuring an existing array: | |
6074 | */ | |
32a7627c | 6075 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6076 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6077 | if ((!mddev->raid_disks && !mddev->external) |
6078 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6079 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6080 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
6081 | err = -ENODEV; |
6082 | goto abort_unlock; | |
6083 | } | |
6084 | ||
6085 | /* | |
6086 | * Commands even a read-only array can execute: | |
6087 | */ | |
6088 | switch (cmd) | |
6089 | { | |
6090 | case GET_ARRAY_INFO: | |
6091 | err = get_array_info(mddev, argp); | |
6092 | goto done_unlock; | |
6093 | ||
32a7627c | 6094 | case GET_BITMAP_FILE: |
87162a28 | 6095 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
6096 | goto done_unlock; |
6097 | ||
1da177e4 LT |
6098 | case GET_DISK_INFO: |
6099 | err = get_disk_info(mddev, argp); | |
6100 | goto done_unlock; | |
6101 | ||
6102 | case RESTART_ARRAY_RW: | |
6103 | err = restart_array(mddev); | |
6104 | goto done_unlock; | |
6105 | ||
6106 | case STOP_ARRAY: | |
d710e138 | 6107 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
6108 | goto done_unlock; |
6109 | ||
6110 | case STOP_ARRAY_RO: | |
a4bd82d0 | 6111 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
6112 | goto done_unlock; |
6113 | ||
e2218350 DW |
6114 | case BLKROSET: |
6115 | if (get_user(ro, (int __user *)(arg))) { | |
6116 | err = -EFAULT; | |
6117 | goto done_unlock; | |
6118 | } | |
6119 | err = -EINVAL; | |
6120 | ||
6121 | /* if the bdev is going readonly the value of mddev->ro | |
6122 | * does not matter, no writes are coming | |
6123 | */ | |
6124 | if (ro) | |
6125 | goto done_unlock; | |
6126 | ||
6127 | /* are we are already prepared for writes? */ | |
6128 | if (mddev->ro != 1) | |
6129 | goto done_unlock; | |
6130 | ||
6131 | /* transitioning to readauto need only happen for | |
6132 | * arrays that call md_write_start | |
6133 | */ | |
6134 | if (mddev->pers) { | |
6135 | err = restart_array(mddev); | |
6136 | if (err == 0) { | |
6137 | mddev->ro = 2; | |
6138 | set_disk_ro(mddev->gendisk, 0); | |
6139 | } | |
6140 | } | |
6141 | goto done_unlock; | |
1da177e4 LT |
6142 | } |
6143 | ||
6144 | /* | |
6145 | * The remaining ioctls are changing the state of the | |
f91de92e N |
6146 | * superblock, so we do not allow them on read-only arrays. |
6147 | * However non-MD ioctls (e.g. get-size) will still come through | |
6148 | * here and hit the 'default' below, so only disallow | |
6149 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 6150 | */ |
bb57fc64 | 6151 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
6152 | if (mddev->ro == 2) { |
6153 | mddev->ro = 0; | |
00bcb4ac | 6154 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
6155 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
6156 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
6157 | } else { |
6158 | err = -EROFS; | |
6159 | goto abort_unlock; | |
6160 | } | |
1da177e4 LT |
6161 | } |
6162 | ||
6163 | switch (cmd) | |
6164 | { | |
6165 | case ADD_NEW_DISK: | |
6166 | { | |
6167 | mdu_disk_info_t info; | |
6168 | if (copy_from_user(&info, argp, sizeof(info))) | |
6169 | err = -EFAULT; | |
6170 | else | |
6171 | err = add_new_disk(mddev, &info); | |
6172 | goto done_unlock; | |
6173 | } | |
6174 | ||
6175 | case HOT_REMOVE_DISK: | |
6176 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
6177 | goto done_unlock; | |
6178 | ||
6179 | case HOT_ADD_DISK: | |
6180 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
6181 | goto done_unlock; | |
6182 | ||
6183 | case SET_DISK_FAULTY: | |
6184 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
6185 | goto done_unlock; | |
6186 | ||
6187 | case RUN_ARRAY: | |
d710e138 | 6188 | err = do_md_run(mddev); |
1da177e4 LT |
6189 | goto done_unlock; |
6190 | ||
32a7627c N |
6191 | case SET_BITMAP_FILE: |
6192 | err = set_bitmap_file(mddev, (int)arg); | |
6193 | goto done_unlock; | |
6194 | ||
1da177e4 | 6195 | default: |
1da177e4 LT |
6196 | err = -EINVAL; |
6197 | goto abort_unlock; | |
6198 | } | |
6199 | ||
6200 | done_unlock: | |
6201 | abort_unlock: | |
d3374825 N |
6202 | if (mddev->hold_active == UNTIL_IOCTL && |
6203 | err != -EINVAL) | |
6204 | mddev->hold_active = 0; | |
1da177e4 LT |
6205 | mddev_unlock(mddev); |
6206 | ||
6207 | return err; | |
6208 | done: | |
6209 | if (err) | |
6210 | MD_BUG(); | |
6211 | abort: | |
6212 | return err; | |
6213 | } | |
aa98aa31 AB |
6214 | #ifdef CONFIG_COMPAT |
6215 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6216 | unsigned int cmd, unsigned long arg) | |
6217 | { | |
6218 | switch (cmd) { | |
6219 | case HOT_REMOVE_DISK: | |
6220 | case HOT_ADD_DISK: | |
6221 | case SET_DISK_FAULTY: | |
6222 | case SET_BITMAP_FILE: | |
6223 | /* These take in integer arg, do not convert */ | |
6224 | break; | |
6225 | default: | |
6226 | arg = (unsigned long)compat_ptr(arg); | |
6227 | break; | |
6228 | } | |
6229 | ||
6230 | return md_ioctl(bdev, mode, cmd, arg); | |
6231 | } | |
6232 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6233 | |
a39907fa | 6234 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6235 | { |
6236 | /* | |
6237 | * Succeed if we can lock the mddev, which confirms that | |
6238 | * it isn't being stopped right now. | |
6239 | */ | |
d3374825 | 6240 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6241 | int err; |
6242 | ||
d3374825 N |
6243 | if (mddev->gendisk != bdev->bd_disk) { |
6244 | /* we are racing with mddev_put which is discarding this | |
6245 | * bd_disk. | |
6246 | */ | |
6247 | mddev_put(mddev); | |
6248 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6249 | flush_workqueue(md_misc_wq); |
d3374825 N |
6250 | /* Then retry the open from the top */ |
6251 | return -ERESTARTSYS; | |
6252 | } | |
6253 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6254 | ||
c8c00a69 | 6255 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6256 | goto out; |
6257 | ||
6258 | err = 0; | |
f2ea68cf | 6259 | atomic_inc(&mddev->openers); |
c8c00a69 | 6260 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6261 | |
f0b4f7e2 | 6262 | check_disk_change(bdev); |
1da177e4 LT |
6263 | out: |
6264 | return err; | |
6265 | } | |
6266 | ||
a39907fa | 6267 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6268 | { |
a39907fa | 6269 | mddev_t *mddev = disk->private_data; |
1da177e4 | 6270 | |
52e5f9d1 | 6271 | BUG_ON(!mddev); |
f2ea68cf | 6272 | atomic_dec(&mddev->openers); |
1da177e4 LT |
6273 | mddev_put(mddev); |
6274 | ||
6275 | return 0; | |
6276 | } | |
f0b4f7e2 N |
6277 | |
6278 | static int md_media_changed(struct gendisk *disk) | |
6279 | { | |
6280 | mddev_t *mddev = disk->private_data; | |
6281 | ||
6282 | return mddev->changed; | |
6283 | } | |
6284 | ||
6285 | static int md_revalidate(struct gendisk *disk) | |
6286 | { | |
6287 | mddev_t *mddev = disk->private_data; | |
6288 | ||
6289 | mddev->changed = 0; | |
6290 | return 0; | |
6291 | } | |
83d5cde4 | 6292 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6293 | { |
6294 | .owner = THIS_MODULE, | |
a39907fa AV |
6295 | .open = md_open, |
6296 | .release = md_release, | |
b492b852 | 6297 | .ioctl = md_ioctl, |
aa98aa31 AB |
6298 | #ifdef CONFIG_COMPAT |
6299 | .compat_ioctl = md_compat_ioctl, | |
6300 | #endif | |
a885c8c4 | 6301 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6302 | .media_changed = md_media_changed, |
6303 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6304 | }; |
6305 | ||
75c96f85 | 6306 | static int md_thread(void * arg) |
1da177e4 LT |
6307 | { |
6308 | mdk_thread_t *thread = arg; | |
6309 | ||
1da177e4 LT |
6310 | /* |
6311 | * md_thread is a 'system-thread', it's priority should be very | |
6312 | * high. We avoid resource deadlocks individually in each | |
6313 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6314 | * the very same RT priority as kswapd, thus we will never get | |
6315 | * into a priority inversion deadlock. | |
6316 | * | |
6317 | * we definitely have to have equal or higher priority than | |
6318 | * bdflush, otherwise bdflush will deadlock if there are too | |
6319 | * many dirty RAID5 blocks. | |
6320 | */ | |
1da177e4 | 6321 | |
6985c43f | 6322 | allow_signal(SIGKILL); |
a6fb0934 | 6323 | while (!kthread_should_stop()) { |
1da177e4 | 6324 | |
93588e22 N |
6325 | /* We need to wait INTERRUPTIBLE so that |
6326 | * we don't add to the load-average. | |
6327 | * That means we need to be sure no signals are | |
6328 | * pending | |
6329 | */ | |
6330 | if (signal_pending(current)) | |
6331 | flush_signals(current); | |
6332 | ||
6333 | wait_event_interruptible_timeout | |
6334 | (thread->wqueue, | |
6335 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6336 | || kthread_should_stop(), | |
6337 | thread->timeout); | |
1da177e4 | 6338 | |
6c987910 N |
6339 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6340 | if (!kthread_should_stop()) | |
589a594b | 6341 | thread->run(thread->mddev); |
1da177e4 | 6342 | } |
a6fb0934 | 6343 | |
1da177e4 LT |
6344 | return 0; |
6345 | } | |
6346 | ||
6347 | void md_wakeup_thread(mdk_thread_t *thread) | |
6348 | { | |
6349 | if (thread) { | |
6350 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
6351 | set_bit(THREAD_WAKEUP, &thread->flags); | |
6352 | wake_up(&thread->wqueue); | |
6353 | } | |
6354 | } | |
6355 | ||
6356 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
6357 | const char *name) | |
6358 | { | |
6359 | mdk_thread_t *thread; | |
1da177e4 | 6360 | |
9ffae0cf | 6361 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
6362 | if (!thread) |
6363 | return NULL; | |
6364 | ||
1da177e4 LT |
6365 | init_waitqueue_head(&thread->wqueue); |
6366 | ||
1da177e4 LT |
6367 | thread->run = run; |
6368 | thread->mddev = mddev; | |
32a7627c | 6369 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6370 | thread->tsk = kthread_run(md_thread, thread, |
6371 | "%s_%s", | |
6372 | mdname(thread->mddev), | |
6373 | name ?: mddev->pers->name); | |
a6fb0934 | 6374 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6375 | kfree(thread); |
6376 | return NULL; | |
6377 | } | |
1da177e4 LT |
6378 | return thread; |
6379 | } | |
6380 | ||
1da177e4 LT |
6381 | void md_unregister_thread(mdk_thread_t *thread) |
6382 | { | |
e0cf8f04 N |
6383 | if (!thread) |
6384 | return; | |
ba25f9dc | 6385 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
6386 | |
6387 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6388 | kfree(thread); |
6389 | } | |
6390 | ||
6391 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
6392 | { | |
6393 | if (!mddev) { | |
6394 | MD_BUG(); | |
6395 | return; | |
6396 | } | |
6397 | ||
b2d444d7 | 6398 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6399 | return; |
6bfe0b49 DW |
6400 | |
6401 | if (mddev->external) | |
6402 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 6403 | /* |
1da177e4 LT |
6404 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
6405 | mdname(mddev), | |
6406 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
6407 | __builtin_return_address(0),__builtin_return_address(1), | |
6408 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 6409 | */ |
d0a0a5ee AM |
6410 | if (!mddev->pers) |
6411 | return; | |
1da177e4 LT |
6412 | if (!mddev->pers->error_handler) |
6413 | return; | |
6414 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6415 | if (mddev->degraded) |
6416 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6417 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6418 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6419 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6420 | md_wakeup_thread(mddev->thread); | |
768a418d | 6421 | if (mddev->event_work.func) |
e804ac78 | 6422 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6423 | md_new_event_inintr(mddev); |
1da177e4 LT |
6424 | } |
6425 | ||
6426 | /* seq_file implementation /proc/mdstat */ | |
6427 | ||
6428 | static void status_unused(struct seq_file *seq) | |
6429 | { | |
6430 | int i = 0; | |
6431 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6432 | |
6433 | seq_printf(seq, "unused devices: "); | |
6434 | ||
159ec1fc | 6435 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6436 | char b[BDEVNAME_SIZE]; |
6437 | i++; | |
6438 | seq_printf(seq, "%s ", | |
6439 | bdevname(rdev->bdev,b)); | |
6440 | } | |
6441 | if (!i) | |
6442 | seq_printf(seq, "<none>"); | |
6443 | ||
6444 | seq_printf(seq, "\n"); | |
6445 | } | |
6446 | ||
6447 | ||
6448 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
6449 | { | |
dd71cf6b N |
6450 | sector_t max_sectors, resync, res; |
6451 | unsigned long dt, db; | |
6452 | sector_t rt; | |
4588b42e N |
6453 | int scale; |
6454 | unsigned int per_milli; | |
1da177e4 | 6455 | |
dd71cf6b | 6456 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6457 | |
6458 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6459 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6460 | else |
dd71cf6b | 6461 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6462 | |
6463 | /* | |
6464 | * Should not happen. | |
6465 | */ | |
dd71cf6b | 6466 | if (!max_sectors) { |
1da177e4 LT |
6467 | MD_BUG(); |
6468 | return; | |
6469 | } | |
4588b42e | 6470 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6471 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6472 | * u32, as those are the requirements for sector_div. |
6473 | * Thus 'scale' must be at least 10 | |
6474 | */ | |
6475 | scale = 10; | |
6476 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6477 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6478 | scale++; |
6479 | } | |
6480 | res = (resync>>scale)*1000; | |
dd71cf6b | 6481 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6482 | |
6483 | per_milli = res; | |
1da177e4 | 6484 | { |
4588b42e | 6485 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6486 | seq_printf(seq, "["); |
6487 | for (i = 0; i < x; i++) | |
6488 | seq_printf(seq, "="); | |
6489 | seq_printf(seq, ">"); | |
6490 | for (i = 0; i < y; i++) | |
6491 | seq_printf(seq, "."); | |
6492 | seq_printf(seq, "] "); | |
6493 | } | |
4588b42e | 6494 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6495 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6496 | "reshape" : | |
61df9d91 N |
6497 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6498 | "check" : | |
6499 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6500 | "resync" : "recovery"))), | |
6501 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6502 | (unsigned long long) resync/2, |
6503 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6504 | |
6505 | /* | |
1da177e4 LT |
6506 | * dt: time from mark until now |
6507 | * db: blocks written from mark until now | |
6508 | * rt: remaining time | |
dd71cf6b N |
6509 | * |
6510 | * rt is a sector_t, so could be 32bit or 64bit. | |
6511 | * So we divide before multiply in case it is 32bit and close | |
6512 | * to the limit. | |
25985edc | 6513 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6514 | * near the end of resync when the number of remaining sectors |
6515 | * is close to 'db'. | |
6516 | * We then divide rt by 32 after multiplying by db to compensate. | |
6517 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6518 | */ |
6519 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6520 | if (!dt) dt++; | |
ff4e8d9a N |
6521 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6522 | - mddev->resync_mark_cnt; | |
1da177e4 | 6523 | |
dd71cf6b N |
6524 | rt = max_sectors - resync; /* number of remaining sectors */ |
6525 | sector_div(rt, db/32+1); | |
6526 | rt *= dt; | |
6527 | rt >>= 5; | |
6528 | ||
6529 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6530 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6531 | |
ff4e8d9a | 6532 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6533 | } |
6534 | ||
6535 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6536 | { | |
6537 | struct list_head *tmp; | |
6538 | loff_t l = *pos; | |
6539 | mddev_t *mddev; | |
6540 | ||
6541 | if (l >= 0x10000) | |
6542 | return NULL; | |
6543 | if (!l--) | |
6544 | /* header */ | |
6545 | return (void*)1; | |
6546 | ||
6547 | spin_lock(&all_mddevs_lock); | |
6548 | list_for_each(tmp,&all_mddevs) | |
6549 | if (!l--) { | |
6550 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6551 | mddev_get(mddev); | |
6552 | spin_unlock(&all_mddevs_lock); | |
6553 | return mddev; | |
6554 | } | |
6555 | spin_unlock(&all_mddevs_lock); | |
6556 | if (!l--) | |
6557 | return (void*)2;/* tail */ | |
6558 | return NULL; | |
6559 | } | |
6560 | ||
6561 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6562 | { | |
6563 | struct list_head *tmp; | |
6564 | mddev_t *next_mddev, *mddev = v; | |
6565 | ||
6566 | ++*pos; | |
6567 | if (v == (void*)2) | |
6568 | return NULL; | |
6569 | ||
6570 | spin_lock(&all_mddevs_lock); | |
6571 | if (v == (void*)1) | |
6572 | tmp = all_mddevs.next; | |
6573 | else | |
6574 | tmp = mddev->all_mddevs.next; | |
6575 | if (tmp != &all_mddevs) | |
6576 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6577 | else { | |
6578 | next_mddev = (void*)2; | |
6579 | *pos = 0x10000; | |
6580 | } | |
6581 | spin_unlock(&all_mddevs_lock); | |
6582 | ||
6583 | if (v != (void*)1) | |
6584 | mddev_put(mddev); | |
6585 | return next_mddev; | |
6586 | ||
6587 | } | |
6588 | ||
6589 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6590 | { | |
6591 | mddev_t *mddev = v; | |
6592 | ||
6593 | if (mddev && v != (void*)1 && v != (void*)2) | |
6594 | mddev_put(mddev); | |
6595 | } | |
6596 | ||
d7603b7e N |
6597 | struct mdstat_info { |
6598 | int event; | |
6599 | }; | |
6600 | ||
1da177e4 LT |
6601 | static int md_seq_show(struct seq_file *seq, void *v) |
6602 | { | |
6603 | mddev_t *mddev = v; | |
dd8ac336 | 6604 | sector_t sectors; |
1da177e4 | 6605 | mdk_rdev_t *rdev; |
d7603b7e | 6606 | struct mdstat_info *mi = seq->private; |
32a7627c | 6607 | struct bitmap *bitmap; |
1da177e4 LT |
6608 | |
6609 | if (v == (void*)1) { | |
2604b703 | 6610 | struct mdk_personality *pers; |
1da177e4 LT |
6611 | seq_printf(seq, "Personalities : "); |
6612 | spin_lock(&pers_lock); | |
2604b703 N |
6613 | list_for_each_entry(pers, &pers_list, list) |
6614 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6615 | |
6616 | spin_unlock(&pers_lock); | |
6617 | seq_printf(seq, "\n"); | |
d7603b7e | 6618 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6619 | return 0; |
6620 | } | |
6621 | if (v == (void*)2) { | |
6622 | status_unused(seq); | |
6623 | return 0; | |
6624 | } | |
6625 | ||
5dc5cf7d | 6626 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6627 | return -EINTR; |
5dc5cf7d | 6628 | |
1da177e4 LT |
6629 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6630 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6631 | mddev->pers ? "" : "in"); | |
6632 | if (mddev->pers) { | |
f91de92e | 6633 | if (mddev->ro==1) |
1da177e4 | 6634 | seq_printf(seq, " (read-only)"); |
f91de92e | 6635 | if (mddev->ro==2) |
52720ae7 | 6636 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6637 | seq_printf(seq, " %s", mddev->pers->name); |
6638 | } | |
6639 | ||
dd8ac336 | 6640 | sectors = 0; |
159ec1fc | 6641 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6642 | char b[BDEVNAME_SIZE]; |
6643 | seq_printf(seq, " %s[%d]", | |
6644 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6645 | if (test_bit(WriteMostly, &rdev->flags)) |
6646 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6647 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6648 | seq_printf(seq, "(F)"); |
6649 | continue; | |
b325a32e N |
6650 | } else if (rdev->raid_disk < 0) |
6651 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6652 | sectors += rdev->sectors; |
1da177e4 LT |
6653 | } |
6654 | ||
6655 | if (!list_empty(&mddev->disks)) { | |
6656 | if (mddev->pers) | |
6657 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6658 | (unsigned long long) |
6659 | mddev->array_sectors / 2); | |
1da177e4 LT |
6660 | else |
6661 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6662 | (unsigned long long)sectors / 2); |
1da177e4 | 6663 | } |
1cd6bf19 N |
6664 | if (mddev->persistent) { |
6665 | if (mddev->major_version != 0 || | |
6666 | mddev->minor_version != 90) { | |
6667 | seq_printf(seq," super %d.%d", | |
6668 | mddev->major_version, | |
6669 | mddev->minor_version); | |
6670 | } | |
e691063a N |
6671 | } else if (mddev->external) |
6672 | seq_printf(seq, " super external:%s", | |
6673 | mddev->metadata_type); | |
6674 | else | |
1cd6bf19 | 6675 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6676 | |
6677 | if (mddev->pers) { | |
d710e138 | 6678 | mddev->pers->status(seq, mddev); |
1da177e4 | 6679 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6680 | if (mddev->pers->sync_request) { |
6681 | if (mddev->curr_resync > 2) { | |
d710e138 | 6682 | status_resync(seq, mddev); |
8e1b39d6 N |
6683 | seq_printf(seq, "\n "); |
6684 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6685 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6686 | else if (mddev->recovery_cp < MaxSector) | |
6687 | seq_printf(seq, "\tresync=PENDING\n "); | |
6688 | } | |
32a7627c N |
6689 | } else |
6690 | seq_printf(seq, "\n "); | |
6691 | ||
6692 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6693 | unsigned long chunk_kb; |
6694 | unsigned long flags; | |
32a7627c | 6695 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6696 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6697 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6698 | "%lu%s chunk", | |
6699 | bitmap->pages - bitmap->missing_pages, | |
6700 | bitmap->pages, | |
6701 | (bitmap->pages - bitmap->missing_pages) | |
6702 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6703 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6704 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6705 | if (bitmap->file) { |
6706 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6707 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6708 | } |
78d742d8 | 6709 | |
32a7627c N |
6710 | seq_printf(seq, "\n"); |
6711 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6712 | } |
6713 | ||
6714 | seq_printf(seq, "\n"); | |
6715 | } | |
6716 | mddev_unlock(mddev); | |
6717 | ||
6718 | return 0; | |
6719 | } | |
6720 | ||
110518bc | 6721 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6722 | .start = md_seq_start, |
6723 | .next = md_seq_next, | |
6724 | .stop = md_seq_stop, | |
6725 | .show = md_seq_show, | |
6726 | }; | |
6727 | ||
6728 | static int md_seq_open(struct inode *inode, struct file *file) | |
6729 | { | |
6730 | int error; | |
d7603b7e N |
6731 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6732 | if (mi == NULL) | |
6733 | return -ENOMEM; | |
1da177e4 LT |
6734 | |
6735 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6736 | if (error) |
6737 | kfree(mi); | |
6738 | else { | |
6739 | struct seq_file *p = file->private_data; | |
6740 | p->private = mi; | |
6741 | mi->event = atomic_read(&md_event_count); | |
6742 | } | |
1da177e4 LT |
6743 | return error; |
6744 | } | |
6745 | ||
d7603b7e N |
6746 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6747 | { | |
6748 | struct seq_file *m = filp->private_data; | |
6749 | struct mdstat_info *mi = m->private; | |
6750 | int mask; | |
6751 | ||
6752 | poll_wait(filp, &md_event_waiters, wait); | |
6753 | ||
6754 | /* always allow read */ | |
6755 | mask = POLLIN | POLLRDNORM; | |
6756 | ||
6757 | if (mi->event != atomic_read(&md_event_count)) | |
6758 | mask |= POLLERR | POLLPRI; | |
6759 | return mask; | |
6760 | } | |
6761 | ||
fa027c2a | 6762 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6763 | .owner = THIS_MODULE, |
1da177e4 LT |
6764 | .open = md_seq_open, |
6765 | .read = seq_read, | |
6766 | .llseek = seq_lseek, | |
c3f94b40 | 6767 | .release = seq_release_private, |
d7603b7e | 6768 | .poll = mdstat_poll, |
1da177e4 LT |
6769 | }; |
6770 | ||
2604b703 | 6771 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6772 | { |
1da177e4 | 6773 | spin_lock(&pers_lock); |
2604b703 N |
6774 | list_add_tail(&p->list, &pers_list); |
6775 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6776 | spin_unlock(&pers_lock); |
6777 | return 0; | |
6778 | } | |
6779 | ||
2604b703 | 6780 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6781 | { |
2604b703 | 6782 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6783 | spin_lock(&pers_lock); |
2604b703 | 6784 | list_del_init(&p->list); |
1da177e4 LT |
6785 | spin_unlock(&pers_lock); |
6786 | return 0; | |
6787 | } | |
6788 | ||
eea1bf38 | 6789 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6790 | { |
6791 | mdk_rdev_t * rdev; | |
1da177e4 | 6792 | int idle; |
eea1bf38 | 6793 | int curr_events; |
1da177e4 LT |
6794 | |
6795 | idle = 1; | |
4b80991c N |
6796 | rcu_read_lock(); |
6797 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6798 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6799 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6800 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6801 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6802 | /* sync IO will cause sync_io to increase before the disk_stats |
6803 | * as sync_io is counted when a request starts, and | |
6804 | * disk_stats is counted when it completes. | |
6805 | * So resync activity will cause curr_events to be smaller than | |
6806 | * when there was no such activity. | |
6807 | * non-sync IO will cause disk_stat to increase without | |
6808 | * increasing sync_io so curr_events will (eventually) | |
6809 | * be larger than it was before. Once it becomes | |
6810 | * substantially larger, the test below will cause | |
6811 | * the array to appear non-idle, and resync will slow | |
6812 | * down. | |
6813 | * If there is a lot of outstanding resync activity when | |
6814 | * we set last_event to curr_events, then all that activity | |
6815 | * completing might cause the array to appear non-idle | |
6816 | * and resync will be slowed down even though there might | |
6817 | * not have been non-resync activity. This will only | |
6818 | * happen once though. 'last_events' will soon reflect | |
6819 | * the state where there is little or no outstanding | |
6820 | * resync requests, and further resync activity will | |
6821 | * always make curr_events less than last_events. | |
c0e48521 | 6822 | * |
1da177e4 | 6823 | */ |
eea1bf38 | 6824 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6825 | rdev->last_events = curr_events; |
6826 | idle = 0; | |
6827 | } | |
6828 | } | |
4b80991c | 6829 | rcu_read_unlock(); |
1da177e4 LT |
6830 | return idle; |
6831 | } | |
6832 | ||
6833 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6834 | { | |
6835 | /* another "blocks" (512byte) blocks have been synced */ | |
6836 | atomic_sub(blocks, &mddev->recovery_active); | |
6837 | wake_up(&mddev->recovery_wait); | |
6838 | if (!ok) { | |
dfc70645 | 6839 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6840 | md_wakeup_thread(mddev->thread); |
6841 | // stop recovery, signal do_sync .... | |
6842 | } | |
6843 | } | |
6844 | ||
6845 | ||
06d91a5f N |
6846 | /* md_write_start(mddev, bi) |
6847 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6848 | * in superblock) before writing, schedule a superblock update |
6849 | * and wait for it to complete. | |
06d91a5f | 6850 | */ |
3d310eb7 | 6851 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6852 | { |
0fd62b86 | 6853 | int did_change = 0; |
06d91a5f | 6854 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6855 | return; |
06d91a5f | 6856 | |
f91de92e N |
6857 | BUG_ON(mddev->ro == 1); |
6858 | if (mddev->ro == 2) { | |
6859 | /* need to switch to read/write */ | |
6860 | mddev->ro = 0; | |
6861 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6862 | md_wakeup_thread(mddev->thread); | |
25156198 | 6863 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6864 | did_change = 1; |
f91de92e | 6865 | } |
06d91a5f | 6866 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6867 | if (mddev->safemode == 1) |
6868 | mddev->safemode = 0; | |
06d91a5f | 6869 | if (mddev->in_sync) { |
a9701a30 | 6870 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6871 | if (mddev->in_sync) { |
6872 | mddev->in_sync = 0; | |
850b2b42 | 6873 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 6874 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 6875 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6876 | did_change = 1; |
3d310eb7 | 6877 | } |
a9701a30 | 6878 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6879 | } |
0fd62b86 | 6880 | if (did_change) |
00bcb4ac | 6881 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 6882 | wait_event(mddev->sb_wait, |
09a44cc1 | 6883 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
6884 | } |
6885 | ||
6886 | void md_write_end(mddev_t *mddev) | |
6887 | { | |
6888 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6889 | if (mddev->safemode == 2) | |
6890 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6891 | else if (mddev->safemode_delay) |
1da177e4 LT |
6892 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6893 | } | |
6894 | } | |
6895 | ||
2a2275d6 N |
6896 | /* md_allow_write(mddev) |
6897 | * Calling this ensures that the array is marked 'active' so that writes | |
6898 | * may proceed without blocking. It is important to call this before | |
6899 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6900 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6901 | * |
6902 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6903 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6904 | */ |
b5470dc5 | 6905 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6906 | { |
6907 | if (!mddev->pers) | |
b5470dc5 | 6908 | return 0; |
2a2275d6 | 6909 | if (mddev->ro) |
b5470dc5 | 6910 | return 0; |
1a0fd497 | 6911 | if (!mddev->pers->sync_request) |
b5470dc5 | 6912 | return 0; |
2a2275d6 N |
6913 | |
6914 | spin_lock_irq(&mddev->write_lock); | |
6915 | if (mddev->in_sync) { | |
6916 | mddev->in_sync = 0; | |
6917 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 6918 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
6919 | if (mddev->safemode_delay && |
6920 | mddev->safemode == 0) | |
6921 | mddev->safemode = 1; | |
6922 | spin_unlock_irq(&mddev->write_lock); | |
6923 | md_update_sb(mddev, 0); | |
00bcb4ac | 6924 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
6925 | } else |
6926 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 6927 | |
070dc6dd | 6928 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
6929 | return -EAGAIN; |
6930 | else | |
6931 | return 0; | |
2a2275d6 N |
6932 | } |
6933 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6934 | ||
1da177e4 LT |
6935 | #define SYNC_MARKS 10 |
6936 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6937 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6938 | { |
6939 | mddev_t *mddev2; | |
6940 | unsigned int currspeed = 0, | |
6941 | window; | |
57afd89f | 6942 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6943 | unsigned long mark[SYNC_MARKS]; |
6944 | sector_t mark_cnt[SYNC_MARKS]; | |
6945 | int last_mark,m; | |
6946 | struct list_head *tmp; | |
6947 | sector_t last_check; | |
57afd89f | 6948 | int skipped = 0; |
5fd6c1dc | 6949 | mdk_rdev_t *rdev; |
61df9d91 | 6950 | char *desc; |
1da177e4 LT |
6951 | |
6952 | /* just incase thread restarts... */ | |
6953 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6954 | return; | |
5fd6c1dc N |
6955 | if (mddev->ro) /* never try to sync a read-only array */ |
6956 | return; | |
1da177e4 | 6957 | |
61df9d91 N |
6958 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6959 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6960 | desc = "data-check"; | |
6961 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6962 | desc = "requested-resync"; | |
6963 | else | |
6964 | desc = "resync"; | |
6965 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6966 | desc = "reshape"; | |
6967 | else | |
6968 | desc = "recovery"; | |
6969 | ||
1da177e4 LT |
6970 | /* we overload curr_resync somewhat here. |
6971 | * 0 == not engaged in resync at all | |
6972 | * 2 == checking that there is no conflict with another sync | |
6973 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6974 | * commense | |
6975 | * other == active in resync - this many blocks | |
6976 | * | |
6977 | * Before starting a resync we must have set curr_resync to | |
6978 | * 2, and then checked that every "conflicting" array has curr_resync | |
6979 | * less than ours. When we find one that is the same or higher | |
6980 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6981 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6982 | * This will mean we have to start checking from the beginning again. | |
6983 | * | |
6984 | */ | |
6985 | ||
6986 | do { | |
6987 | mddev->curr_resync = 2; | |
6988 | ||
6989 | try_again: | |
404e4b43 | 6990 | if (kthread_should_stop()) |
6985c43f | 6991 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
6992 | |
6993 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 6994 | goto skip; |
29ac4aa3 | 6995 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6996 | if (mddev2 == mddev) |
6997 | continue; | |
90b08710 BS |
6998 | if (!mddev->parallel_resync |
6999 | && mddev2->curr_resync | |
7000 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
7001 | DEFINE_WAIT(wq); |
7002 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
7003 | /* arbitrarily yield */ | |
7004 | mddev->curr_resync = 1; | |
7005 | wake_up(&resync_wait); | |
7006 | } | |
7007 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
7008 | /* no need to wait here, we can wait the next | |
7009 | * time 'round when curr_resync == 2 | |
7010 | */ | |
7011 | continue; | |
9744197c N |
7012 | /* We need to wait 'interruptible' so as not to |
7013 | * contribute to the load average, and not to | |
7014 | * be caught by 'softlockup' | |
7015 | */ | |
7016 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 7017 | if (!kthread_should_stop() && |
8712e553 | 7018 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
7019 | printk(KERN_INFO "md: delaying %s of %s" |
7020 | " until %s has finished (they" | |
1da177e4 | 7021 | " share one or more physical units)\n", |
61df9d91 | 7022 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 7023 | mddev_put(mddev2); |
9744197c N |
7024 | if (signal_pending(current)) |
7025 | flush_signals(current); | |
1da177e4 LT |
7026 | schedule(); |
7027 | finish_wait(&resync_wait, &wq); | |
7028 | goto try_again; | |
7029 | } | |
7030 | finish_wait(&resync_wait, &wq); | |
7031 | } | |
7032 | } | |
7033 | } while (mddev->curr_resync < 2); | |
7034 | ||
5fd6c1dc | 7035 | j = 0; |
9d88883e | 7036 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 7037 | /* resync follows the size requested by the personality, |
57afd89f | 7038 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
7039 | */ |
7040 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 7041 | mddev->resync_mismatches = 0; |
5fd6c1dc | 7042 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
7043 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
7044 | j = mddev->resync_min; | |
7045 | else if (!mddev->bitmap) | |
5fd6c1dc | 7046 | j = mddev->recovery_cp; |
5e96ee65 | 7047 | |
ccfcc3c1 | 7048 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 7049 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7050 | else { |
1da177e4 | 7051 | /* recovery follows the physical size of devices */ |
58c0fed4 | 7052 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 7053 | j = MaxSector; |
4e59ca7d DW |
7054 | rcu_read_lock(); |
7055 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
7056 | if (rdev->raid_disk >= 0 && |
7057 | !test_bit(Faulty, &rdev->flags) && | |
7058 | !test_bit(In_sync, &rdev->flags) && | |
7059 | rdev->recovery_offset < j) | |
7060 | j = rdev->recovery_offset; | |
4e59ca7d | 7061 | rcu_read_unlock(); |
5fd6c1dc | 7062 | } |
1da177e4 | 7063 | |
61df9d91 N |
7064 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7065 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7066 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7067 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7068 | "(but not more than %d KB/sec) for %s.\n", |
7069 | speed_max(mddev), desc); | |
1da177e4 | 7070 | |
eea1bf38 | 7071 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7072 | |
57afd89f | 7073 | io_sectors = 0; |
1da177e4 LT |
7074 | for (m = 0; m < SYNC_MARKS; m++) { |
7075 | mark[m] = jiffies; | |
57afd89f | 7076 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7077 | } |
7078 | last_mark = 0; | |
7079 | mddev->resync_mark = mark[last_mark]; | |
7080 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7081 | ||
7082 | /* | |
7083 | * Tune reconstruction: | |
7084 | */ | |
7085 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7086 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7087 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7088 | |
7089 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7090 | last_check = 0; |
7091 | ||
7092 | if (j>2) { | |
7093 | printk(KERN_INFO | |
61df9d91 N |
7094 | "md: resuming %s of %s from checkpoint.\n", |
7095 | desc, mdname(mddev)); | |
1da177e4 LT |
7096 | mddev->curr_resync = j; |
7097 | } | |
75d3da43 | 7098 | mddev->curr_resync_completed = j; |
1da177e4 LT |
7099 | |
7100 | while (j < max_sectors) { | |
57afd89f | 7101 | sector_t sectors; |
1da177e4 | 7102 | |
57afd89f | 7103 | skipped = 0; |
97e4f42d | 7104 | |
7a91ee1f N |
7105 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7106 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7107 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7108 | > (max_sectors >> 4)) || | |
7109 | (j - mddev->curr_resync_completed)*2 | |
7110 | >= mddev->resync_max - mddev->curr_resync_completed | |
7111 | )) { | |
97e4f42d | 7112 | /* time to update curr_resync_completed */ |
97e4f42d N |
7113 | wait_event(mddev->recovery_wait, |
7114 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7115 | mddev->curr_resync_completed = j; |
070dc6dd | 7116 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7117 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7118 | } |
acb180b0 | 7119 | |
e62e58a5 N |
7120 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
7121 | /* As this condition is controlled by user-space, | |
7122 | * we can block indefinitely, so use '_interruptible' | |
7123 | * to avoid triggering warnings. | |
7124 | */ | |
7125 | flush_signals(current); /* just in case */ | |
7126 | wait_event_interruptible(mddev->recovery_wait, | |
7127 | mddev->resync_max > j | |
7128 | || kthread_should_stop()); | |
7129 | } | |
acb180b0 N |
7130 | |
7131 | if (kthread_should_stop()) | |
7132 | goto interrupted; | |
7133 | ||
57afd89f | 7134 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7135 | currspeed < speed_min(mddev)); |
57afd89f | 7136 | if (sectors == 0) { |
dfc70645 | 7137 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
7138 | goto out; |
7139 | } | |
57afd89f N |
7140 | |
7141 | if (!skipped) { /* actual IO requested */ | |
7142 | io_sectors += sectors; | |
7143 | atomic_add(sectors, &mddev->recovery_active); | |
7144 | } | |
7145 | ||
1da177e4 LT |
7146 | j += sectors; |
7147 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 7148 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
7149 | if (last_check == 0) |
7150 | /* this is the earliers that rebuilt will be | |
7151 | * visible in /proc/mdstat | |
7152 | */ | |
7153 | md_new_event(mddev); | |
57afd89f N |
7154 | |
7155 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7156 | continue; |
7157 | ||
57afd89f | 7158 | last_check = io_sectors; |
1da177e4 | 7159 | |
dfc70645 | 7160 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
7161 | break; |
7162 | ||
7163 | repeat: | |
7164 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7165 | /* step marks */ | |
7166 | int next = (last_mark+1) % SYNC_MARKS; | |
7167 | ||
7168 | mddev->resync_mark = mark[next]; | |
7169 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7170 | mark[next] = jiffies; | |
57afd89f | 7171 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7172 | last_mark = next; |
7173 | } | |
7174 | ||
7175 | ||
c6207277 N |
7176 | if (kthread_should_stop()) |
7177 | goto interrupted; | |
7178 | ||
1da177e4 LT |
7179 | |
7180 | /* | |
7181 | * this loop exits only if either when we are slower than | |
7182 | * the 'hard' speed limit, or the system was IO-idle for | |
7183 | * a jiffy. | |
7184 | * the system might be non-idle CPU-wise, but we only care | |
7185 | * about not overloading the IO subsystem. (things like an | |
7186 | * e2fsck being done on the RAID array should execute fast) | |
7187 | */ | |
1da177e4 LT |
7188 | cond_resched(); |
7189 | ||
57afd89f N |
7190 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
7191 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 7192 | |
88202a0c N |
7193 | if (currspeed > speed_min(mddev)) { |
7194 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7195 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7196 | msleep(500); |
1da177e4 LT |
7197 | goto repeat; |
7198 | } | |
7199 | } | |
7200 | } | |
61df9d91 | 7201 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
7202 | /* |
7203 | * this also signals 'finished resyncing' to md_stop | |
7204 | */ | |
7205 | out: | |
1da177e4 LT |
7206 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7207 | ||
7208 | /* tell personality that we are finished */ | |
57afd89f | 7209 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7210 | |
dfc70645 | 7211 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7212 | mddev->curr_resync > 2) { |
7213 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7214 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7215 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7216 | printk(KERN_INFO | |
61df9d91 N |
7217 | "md: checkpointing %s of %s.\n", |
7218 | desc, mdname(mddev)); | |
5fd6c1dc N |
7219 | mddev->recovery_cp = mddev->curr_resync; |
7220 | } | |
7221 | } else | |
7222 | mddev->recovery_cp = MaxSector; | |
7223 | } else { | |
7224 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7225 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
7226 | rcu_read_lock(); |
7227 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 7228 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7229 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7230 | !test_bit(Faulty, &rdev->flags) && |
7231 | !test_bit(In_sync, &rdev->flags) && | |
7232 | rdev->recovery_offset < mddev->curr_resync) | |
7233 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7234 | rcu_read_unlock(); |
5fd6c1dc | 7235 | } |
1da177e4 | 7236 | } |
17571284 | 7237 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7238 | |
1da177e4 | 7239 | skip: |
c07b70ad N |
7240 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7241 | /* We completed so min/max setting can be forgotten if used. */ | |
7242 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7243 | mddev->resync_min = 0; | |
7244 | mddev->resync_max = MaxSector; | |
7245 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7246 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7247 | mddev->curr_resync = 0; |
7248 | wake_up(&resync_wait); | |
7249 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7250 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
7251 | return; |
7252 | ||
7253 | interrupted: | |
7254 | /* | |
7255 | * got a signal, exit. | |
7256 | */ | |
7257 | printk(KERN_INFO | |
7258 | "md: md_do_sync() got signal ... exiting\n"); | |
7259 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7260 | goto out; | |
7261 | ||
1da177e4 | 7262 | } |
29269553 | 7263 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7264 | |
b4c4c7b8 N |
7265 | static int remove_and_add_spares(mddev_t *mddev) |
7266 | { | |
7267 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
7268 | int spares = 0; |
7269 | ||
97e4f42d N |
7270 | mddev->curr_resync_completed = 0; |
7271 | ||
159ec1fc | 7272 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 7273 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 7274 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7275 | (test_bit(Faulty, &rdev->flags) || |
7276 | ! test_bit(In_sync, &rdev->flags)) && | |
7277 | atomic_read(&rdev->nr_pending)==0) { | |
7278 | if (mddev->pers->hot_remove_disk( | |
7279 | mddev, rdev->raid_disk)==0) { | |
36fad858 | 7280 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 N |
7281 | rdev->raid_disk = -1; |
7282 | } | |
7283 | } | |
7284 | ||
5389042f | 7285 | if (mddev->degraded) { |
159ec1fc | 7286 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 7287 | if (rdev->raid_disk >= 0 && |
e5427135 | 7288 | !test_bit(In_sync, &rdev->flags) && |
4274215d | 7289 | !test_bit(Faulty, &rdev->flags) && |
e5427135 | 7290 | !test_bit(Blocked, &rdev->flags)) |
dfc70645 | 7291 | spares++; |
b4c4c7b8 N |
7292 | if (rdev->raid_disk < 0 |
7293 | && !test_bit(Faulty, &rdev->flags)) { | |
7294 | rdev->recovery_offset = 0; | |
199050ea NB |
7295 | if (mddev->pers-> |
7296 | hot_add_disk(mddev, rdev) == 0) { | |
36fad858 | 7297 | if (sysfs_link_rdev(mddev, rdev)) |
00bcb4ac | 7298 | /* failure here is OK */; |
b4c4c7b8 N |
7299 | spares++; |
7300 | md_new_event(mddev); | |
93be75ff | 7301 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
7302 | } else |
7303 | break; | |
7304 | } | |
dfc70645 | 7305 | } |
b4c4c7b8 N |
7306 | } |
7307 | return spares; | |
7308 | } | |
7ebc0be7 N |
7309 | |
7310 | static void reap_sync_thread(mddev_t *mddev) | |
7311 | { | |
7312 | mdk_rdev_t *rdev; | |
7313 | ||
7314 | /* resync has finished, collect result */ | |
7315 | md_unregister_thread(mddev->sync_thread); | |
7316 | mddev->sync_thread = NULL; | |
7317 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7318 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7319 | /* success...*/ | |
7320 | /* activate any spares */ | |
7321 | if (mddev->pers->spare_active(mddev)) | |
7322 | sysfs_notify(&mddev->kobj, NULL, | |
7323 | "degraded"); | |
7324 | } | |
7325 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7326 | mddev->pers->finish_reshape) | |
7327 | mddev->pers->finish_reshape(mddev); | |
7328 | md_update_sb(mddev, 1); | |
7329 | ||
7330 | /* if array is no-longer degraded, then any saved_raid_disk | |
7331 | * information must be scrapped | |
7332 | */ | |
7333 | if (!mddev->degraded) | |
7334 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
7335 | rdev->saved_raid_disk = -1; | |
7336 | ||
7337 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7338 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7339 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7340 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7341 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7342 | /* flag recovery needed just to double check */ | |
7343 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7344 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7345 | md_new_event(mddev); | |
768e587e JB |
7346 | if (mddev->event_work.func) |
7347 | queue_work(md_misc_wq, &mddev->event_work); | |
7ebc0be7 N |
7348 | } |
7349 | ||
1da177e4 LT |
7350 | /* |
7351 | * This routine is regularly called by all per-raid-array threads to | |
7352 | * deal with generic issues like resync and super-block update. | |
7353 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7354 | * need this as they never do any recovery or update the superblock. | |
7355 | * | |
7356 | * It does not do any resync itself, but rather "forks" off other threads | |
7357 | * to do that as needed. | |
7358 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7359 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7360 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7361 | * and wakeups up this thread which will reap the thread and finish up. |
7362 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7363 | * | |
7364 | * The overall approach is: | |
7365 | * 1/ if the superblock needs updating, update it. | |
7366 | * 2/ If a recovery thread is running, don't do anything else. | |
7367 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7368 | * 4/ If there are any faulty devices, remove them. | |
7369 | * 5/ If array is degraded, try to add spares devices | |
7370 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7371 | */ | |
7372 | void md_check_recovery(mddev_t *mddev) | |
7373 | { | |
68866e42 JB |
7374 | if (mddev->suspended) |
7375 | return; | |
7376 | ||
5f40402d | 7377 | if (mddev->bitmap) |
aa5cbd10 | 7378 | bitmap_daemon_work(mddev); |
1da177e4 | 7379 | |
fca4d848 | 7380 | if (signal_pending(current)) { |
31a59e34 | 7381 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7382 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7383 | mdname(mddev)); | |
7384 | mddev->safemode = 2; | |
7385 | } | |
7386 | flush_signals(current); | |
7387 | } | |
7388 | ||
c89a8eee N |
7389 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7390 | return; | |
1da177e4 | 7391 | if ( ! ( |
126925c0 | 7392 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7393 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7394 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7395 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7396 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7397 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7398 | )) |
7399 | return; | |
fca4d848 | 7400 | |
df5b89b3 | 7401 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7402 | int spares = 0; |
fca4d848 | 7403 | |
c89a8eee N |
7404 | if (mddev->ro) { |
7405 | /* Only thing we do on a ro array is remove | |
7406 | * failed devices. | |
7407 | */ | |
a8c42c7f N |
7408 | mdk_rdev_t *rdev; |
7409 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
7410 | if (rdev->raid_disk >= 0 && | |
7411 | !test_bit(Blocked, &rdev->flags) && | |
7412 | test_bit(Faulty, &rdev->flags) && | |
7413 | atomic_read(&rdev->nr_pending)==0) { | |
7414 | if (mddev->pers->hot_remove_disk( | |
7415 | mddev, rdev->raid_disk)==0) { | |
36fad858 | 7416 | sysfs_unlink_rdev(mddev, rdev); |
a8c42c7f N |
7417 | rdev->raid_disk = -1; |
7418 | } | |
7419 | } | |
c89a8eee N |
7420 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7421 | goto unlock; | |
7422 | } | |
7423 | ||
31a59e34 | 7424 | if (!mddev->external) { |
0fd62b86 | 7425 | int did_change = 0; |
31a59e34 N |
7426 | spin_lock_irq(&mddev->write_lock); |
7427 | if (mddev->safemode && | |
7428 | !atomic_read(&mddev->writes_pending) && | |
7429 | !mddev->in_sync && | |
7430 | mddev->recovery_cp == MaxSector) { | |
7431 | mddev->in_sync = 1; | |
0fd62b86 | 7432 | did_change = 1; |
070dc6dd | 7433 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7434 | } |
7435 | if (mddev->safemode == 1) | |
7436 | mddev->safemode = 0; | |
7437 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7438 | if (did_change) |
00bcb4ac | 7439 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7440 | } |
fca4d848 | 7441 | |
850b2b42 N |
7442 | if (mddev->flags) |
7443 | md_update_sb(mddev, 0); | |
06d91a5f | 7444 | |
1da177e4 LT |
7445 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7446 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7447 | /* resync/recovery still happening */ | |
7448 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7449 | goto unlock; | |
7450 | } | |
7451 | if (mddev->sync_thread) { | |
7ebc0be7 | 7452 | reap_sync_thread(mddev); |
1da177e4 LT |
7453 | goto unlock; |
7454 | } | |
72a23c21 NB |
7455 | /* Set RUNNING before clearing NEEDED to avoid |
7456 | * any transients in the value of "sync_action". | |
7457 | */ | |
7458 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7459 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7460 | /* Clear some bits that don't mean anything, but |
7461 | * might be left set | |
7462 | */ | |
24dd469d N |
7463 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7464 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7465 | |
5fd6c1dc N |
7466 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7467 | goto unlock; | |
1da177e4 LT |
7468 | /* no recovery is running. |
7469 | * remove any failed drives, then | |
7470 | * add spares if possible. | |
7471 | * Spare are also removed and re-added, to allow | |
7472 | * the personality to fail the re-add. | |
7473 | */ | |
1da177e4 | 7474 | |
b4c4c7b8 | 7475 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7476 | if (mddev->pers->check_reshape == NULL || |
7477 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7478 | /* Cannot proceed */ |
7479 | goto unlock; | |
7480 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7481 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7482 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7483 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7484 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7485 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7486 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7487 | } else if (mddev->recovery_cp < MaxSector) { |
7488 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7489 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7490 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7491 | /* nothing to be done ... */ | |
1da177e4 | 7492 | goto unlock; |
24dd469d | 7493 | |
1da177e4 | 7494 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7495 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7496 | /* We are adding a device or devices to an array | |
7497 | * which has the bitmap stored on all devices. | |
7498 | * So make sure all bitmap pages get written | |
7499 | */ | |
7500 | bitmap_write_all(mddev->bitmap); | |
7501 | } | |
1da177e4 LT |
7502 | mddev->sync_thread = md_register_thread(md_do_sync, |
7503 | mddev, | |
0da3c619 | 7504 | "resync"); |
1da177e4 LT |
7505 | if (!mddev->sync_thread) { |
7506 | printk(KERN_ERR "%s: could not start resync" | |
7507 | " thread...\n", | |
7508 | mdname(mddev)); | |
7509 | /* leave the spares where they are, it shouldn't hurt */ | |
7ebc0be7 N |
7510 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7511 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7512 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7513 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7514 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
d7603b7e | 7515 | } else |
1da177e4 | 7516 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7517 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7518 | md_new_event(mddev); |
1da177e4 LT |
7519 | } |
7520 | unlock: | |
72a23c21 NB |
7521 | if (!mddev->sync_thread) { |
7522 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7523 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7524 | &mddev->recovery)) | |
0c3573f1 | 7525 | if (mddev->sysfs_action) |
00bcb4ac | 7526 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7527 | } |
1da177e4 LT |
7528 | mddev_unlock(mddev); |
7529 | } | |
7530 | } | |
7531 | ||
6bfe0b49 DW |
7532 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
7533 | { | |
00bcb4ac | 7534 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 DW |
7535 | wait_event_timeout(rdev->blocked_wait, |
7536 | !test_bit(Blocked, &rdev->flags), | |
7537 | msecs_to_jiffies(5000)); | |
7538 | rdev_dec_pending(rdev, mddev); | |
7539 | } | |
7540 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7541 | ||
2230dfe4 N |
7542 | |
7543 | /* Bad block management. | |
7544 | * We can record which blocks on each device are 'bad' and so just | |
7545 | * fail those blocks, or that stripe, rather than the whole device. | |
7546 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7547 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7548 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7549 | * A 'shift' can be set so that larger blocks are tracked and | |
7550 | * consequently larger devices can be covered. | |
7551 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7552 | * | |
7553 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7554 | * might need to retry if it is very unlucky. | |
7555 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7556 | * so we use the write_seqlock_irq variant. | |
7557 | * | |
7558 | * When looking for a bad block we specify a range and want to | |
7559 | * know if any block in the range is bad. So we binary-search | |
7560 | * to the last range that starts at-or-before the given endpoint, | |
7561 | * (or "before the sector after the target range") | |
7562 | * then see if it ends after the given start. | |
7563 | * We return | |
7564 | * 0 if there are no known bad blocks in the range | |
7565 | * 1 if there are known bad block which are all acknowledged | |
7566 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
7567 | * plus the start/length of the first bad section we overlap. | |
7568 | */ | |
7569 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
7570 | sector_t *first_bad, int *bad_sectors) | |
7571 | { | |
7572 | int hi; | |
7573 | int lo = 0; | |
7574 | u64 *p = bb->page; | |
7575 | int rv = 0; | |
7576 | sector_t target = s + sectors; | |
7577 | unsigned seq; | |
7578 | ||
7579 | if (bb->shift > 0) { | |
7580 | /* round the start down, and the end up */ | |
7581 | s >>= bb->shift; | |
7582 | target += (1<<bb->shift) - 1; | |
7583 | target >>= bb->shift; | |
7584 | sectors = target - s; | |
7585 | } | |
7586 | /* 'target' is now the first block after the bad range */ | |
7587 | ||
7588 | retry: | |
7589 | seq = read_seqbegin(&bb->lock); | |
7590 | ||
7591 | hi = bb->count; | |
7592 | ||
7593 | /* Binary search between lo and hi for 'target' | |
7594 | * i.e. for the last range that starts before 'target' | |
7595 | */ | |
7596 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
7597 | * are known not to be the last range before target. | |
7598 | * VARIANT: hi-lo is the number of possible | |
7599 | * ranges, and decreases until it reaches 1 | |
7600 | */ | |
7601 | while (hi - lo > 1) { | |
7602 | int mid = (lo + hi) / 2; | |
7603 | sector_t a = BB_OFFSET(p[mid]); | |
7604 | if (a < target) | |
7605 | /* This could still be the one, earlier ranges | |
7606 | * could not. */ | |
7607 | lo = mid; | |
7608 | else | |
7609 | /* This and later ranges are definitely out. */ | |
7610 | hi = mid; | |
7611 | } | |
7612 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
7613 | if (hi > lo) { | |
7614 | /* need to check all range that end after 's' to see if | |
7615 | * any are unacknowledged. | |
7616 | */ | |
7617 | while (lo >= 0 && | |
7618 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7619 | if (BB_OFFSET(p[lo]) < target) { | |
7620 | /* starts before the end, and finishes after | |
7621 | * the start, so they must overlap | |
7622 | */ | |
7623 | if (rv != -1 && BB_ACK(p[lo])) | |
7624 | rv = 1; | |
7625 | else | |
7626 | rv = -1; | |
7627 | *first_bad = BB_OFFSET(p[lo]); | |
7628 | *bad_sectors = BB_LEN(p[lo]); | |
7629 | } | |
7630 | lo--; | |
7631 | } | |
7632 | } | |
7633 | ||
7634 | if (read_seqretry(&bb->lock, seq)) | |
7635 | goto retry; | |
7636 | ||
7637 | return rv; | |
7638 | } | |
7639 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
7640 | ||
7641 | /* | |
7642 | * Add a range of bad blocks to the table. | |
7643 | * This might extend the table, or might contract it | |
7644 | * if two adjacent ranges can be merged. | |
7645 | * We binary-search to find the 'insertion' point, then | |
7646 | * decide how best to handle it. | |
7647 | */ | |
7648 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
7649 | int acknowledged) | |
7650 | { | |
7651 | u64 *p; | |
7652 | int lo, hi; | |
7653 | int rv = 1; | |
7654 | ||
7655 | if (bb->shift < 0) | |
7656 | /* badblocks are disabled */ | |
7657 | return 0; | |
7658 | ||
7659 | if (bb->shift) { | |
7660 | /* round the start down, and the end up */ | |
7661 | sector_t next = s + sectors; | |
7662 | s >>= bb->shift; | |
7663 | next += (1<<bb->shift) - 1; | |
7664 | next >>= bb->shift; | |
7665 | sectors = next - s; | |
7666 | } | |
7667 | ||
7668 | write_seqlock_irq(&bb->lock); | |
7669 | ||
7670 | p = bb->page; | |
7671 | lo = 0; | |
7672 | hi = bb->count; | |
7673 | /* Find the last range that starts at-or-before 's' */ | |
7674 | while (hi - lo > 1) { | |
7675 | int mid = (lo + hi) / 2; | |
7676 | sector_t a = BB_OFFSET(p[mid]); | |
7677 | if (a <= s) | |
7678 | lo = mid; | |
7679 | else | |
7680 | hi = mid; | |
7681 | } | |
7682 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
7683 | hi = lo; | |
7684 | ||
7685 | if (hi > lo) { | |
7686 | /* we found a range that might merge with the start | |
7687 | * of our new range | |
7688 | */ | |
7689 | sector_t a = BB_OFFSET(p[lo]); | |
7690 | sector_t e = a + BB_LEN(p[lo]); | |
7691 | int ack = BB_ACK(p[lo]); | |
7692 | if (e >= s) { | |
7693 | /* Yes, we can merge with a previous range */ | |
7694 | if (s == a && s + sectors >= e) | |
7695 | /* new range covers old */ | |
7696 | ack = acknowledged; | |
7697 | else | |
7698 | ack = ack && acknowledged; | |
7699 | ||
7700 | if (e < s + sectors) | |
7701 | e = s + sectors; | |
7702 | if (e - a <= BB_MAX_LEN) { | |
7703 | p[lo] = BB_MAKE(a, e-a, ack); | |
7704 | s = e; | |
7705 | } else { | |
7706 | /* does not all fit in one range, | |
7707 | * make p[lo] maximal | |
7708 | */ | |
7709 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
7710 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
7711 | s = a + BB_MAX_LEN; | |
7712 | } | |
7713 | sectors = e - s; | |
7714 | } | |
7715 | } | |
7716 | if (sectors && hi < bb->count) { | |
7717 | /* 'hi' points to the first range that starts after 's'. | |
7718 | * Maybe we can merge with the start of that range */ | |
7719 | sector_t a = BB_OFFSET(p[hi]); | |
7720 | sector_t e = a + BB_LEN(p[hi]); | |
7721 | int ack = BB_ACK(p[hi]); | |
7722 | if (a <= s + sectors) { | |
7723 | /* merging is possible */ | |
7724 | if (e <= s + sectors) { | |
7725 | /* full overlap */ | |
7726 | e = s + sectors; | |
7727 | ack = acknowledged; | |
7728 | } else | |
7729 | ack = ack && acknowledged; | |
7730 | ||
7731 | a = s; | |
7732 | if (e - a <= BB_MAX_LEN) { | |
7733 | p[hi] = BB_MAKE(a, e-a, ack); | |
7734 | s = e; | |
7735 | } else { | |
7736 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
7737 | s = a + BB_MAX_LEN; | |
7738 | } | |
7739 | sectors = e - s; | |
7740 | lo = hi; | |
7741 | hi++; | |
7742 | } | |
7743 | } | |
7744 | if (sectors == 0 && hi < bb->count) { | |
7745 | /* we might be able to combine lo and hi */ | |
7746 | /* Note: 's' is at the end of 'lo' */ | |
7747 | sector_t a = BB_OFFSET(p[hi]); | |
7748 | int lolen = BB_LEN(p[lo]); | |
7749 | int hilen = BB_LEN(p[hi]); | |
7750 | int newlen = lolen + hilen - (s - a); | |
7751 | if (s >= a && newlen < BB_MAX_LEN) { | |
7752 | /* yes, we can combine them */ | |
7753 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
7754 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
7755 | memmove(p + hi, p + hi + 1, | |
7756 | (bb->count - hi - 1) * 8); | |
7757 | bb->count--; | |
7758 | } | |
7759 | } | |
7760 | while (sectors) { | |
7761 | /* didn't merge (it all). | |
7762 | * Need to add a range just before 'hi' */ | |
7763 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
7764 | /* No room for more */ | |
7765 | rv = 0; | |
7766 | break; | |
7767 | } else { | |
7768 | int this_sectors = sectors; | |
7769 | memmove(p + hi + 1, p + hi, | |
7770 | (bb->count - hi) * 8); | |
7771 | bb->count++; | |
7772 | ||
7773 | if (this_sectors > BB_MAX_LEN) | |
7774 | this_sectors = BB_MAX_LEN; | |
7775 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
7776 | sectors -= this_sectors; | |
7777 | s += this_sectors; | |
7778 | } | |
7779 | } | |
7780 | ||
7781 | bb->changed = 1; | |
7782 | write_sequnlock_irq(&bb->lock); | |
7783 | ||
7784 | return rv; | |
7785 | } | |
7786 | ||
7787 | int rdev_set_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors, | |
7788 | int acknowledged) | |
7789 | { | |
7790 | int rv = md_set_badblocks(&rdev->badblocks, | |
7791 | s + rdev->data_offset, sectors, acknowledged); | |
7792 | if (rv) { | |
7793 | /* Make sure they get written out promptly */ | |
7794 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); | |
7795 | md_wakeup_thread(rdev->mddev->thread); | |
7796 | } | |
7797 | return rv; | |
7798 | } | |
7799 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
7800 | ||
7801 | /* | |
7802 | * Remove a range of bad blocks from the table. | |
7803 | * This may involve extending the table if we spilt a region, | |
7804 | * but it must not fail. So if the table becomes full, we just | |
7805 | * drop the remove request. | |
7806 | */ | |
7807 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
7808 | { | |
7809 | u64 *p; | |
7810 | int lo, hi; | |
7811 | sector_t target = s + sectors; | |
7812 | int rv = 0; | |
7813 | ||
7814 | if (bb->shift > 0) { | |
7815 | /* When clearing we round the start up and the end down. | |
7816 | * This should not matter as the shift should align with | |
7817 | * the block size and no rounding should ever be needed. | |
7818 | * However it is better the think a block is bad when it | |
7819 | * isn't than to think a block is not bad when it is. | |
7820 | */ | |
7821 | s += (1<<bb->shift) - 1; | |
7822 | s >>= bb->shift; | |
7823 | target >>= bb->shift; | |
7824 | sectors = target - s; | |
7825 | } | |
7826 | ||
7827 | write_seqlock_irq(&bb->lock); | |
7828 | ||
7829 | p = bb->page; | |
7830 | lo = 0; | |
7831 | hi = bb->count; | |
7832 | /* Find the last range that starts before 'target' */ | |
7833 | while (hi - lo > 1) { | |
7834 | int mid = (lo + hi) / 2; | |
7835 | sector_t a = BB_OFFSET(p[mid]); | |
7836 | if (a < target) | |
7837 | lo = mid; | |
7838 | else | |
7839 | hi = mid; | |
7840 | } | |
7841 | if (hi > lo) { | |
7842 | /* p[lo] is the last range that could overlap the | |
7843 | * current range. Earlier ranges could also overlap, | |
7844 | * but only this one can overlap the end of the range. | |
7845 | */ | |
7846 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
7847 | /* Partial overlap, leave the tail of this range */ | |
7848 | int ack = BB_ACK(p[lo]); | |
7849 | sector_t a = BB_OFFSET(p[lo]); | |
7850 | sector_t end = a + BB_LEN(p[lo]); | |
7851 | ||
7852 | if (a < s) { | |
7853 | /* we need to split this range */ | |
7854 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
7855 | rv = 0; | |
7856 | goto out; | |
7857 | } | |
7858 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
7859 | bb->count++; | |
7860 | p[lo] = BB_MAKE(a, s-a, ack); | |
7861 | lo++; | |
7862 | } | |
7863 | p[lo] = BB_MAKE(target, end - target, ack); | |
7864 | /* there is no longer an overlap */ | |
7865 | hi = lo; | |
7866 | lo--; | |
7867 | } | |
7868 | while (lo >= 0 && | |
7869 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7870 | /* This range does overlap */ | |
7871 | if (BB_OFFSET(p[lo]) < s) { | |
7872 | /* Keep the early parts of this range. */ | |
7873 | int ack = BB_ACK(p[lo]); | |
7874 | sector_t start = BB_OFFSET(p[lo]); | |
7875 | p[lo] = BB_MAKE(start, s - start, ack); | |
7876 | /* now low doesn't overlap, so.. */ | |
7877 | break; | |
7878 | } | |
7879 | lo--; | |
7880 | } | |
7881 | /* 'lo' is strictly before, 'hi' is strictly after, | |
7882 | * anything between needs to be discarded | |
7883 | */ | |
7884 | if (hi - lo > 1) { | |
7885 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
7886 | bb->count -= (hi - lo - 1); | |
7887 | } | |
7888 | } | |
7889 | ||
7890 | bb->changed = 1; | |
7891 | out: | |
7892 | write_sequnlock_irq(&bb->lock); | |
7893 | return rv; | |
7894 | } | |
7895 | ||
7896 | int rdev_clear_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors) | |
7897 | { | |
7898 | return md_clear_badblocks(&rdev->badblocks, | |
7899 | s + rdev->data_offset, | |
7900 | sectors); | |
7901 | } | |
7902 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
7903 | ||
7904 | /* | |
7905 | * Acknowledge all bad blocks in a list. | |
7906 | * This only succeeds if ->changed is clear. It is used by | |
7907 | * in-kernel metadata updates | |
7908 | */ | |
7909 | void md_ack_all_badblocks(struct badblocks *bb) | |
7910 | { | |
7911 | if (bb->page == NULL || bb->changed) | |
7912 | /* no point even trying */ | |
7913 | return; | |
7914 | write_seqlock_irq(&bb->lock); | |
7915 | ||
7916 | if (bb->changed == 0) { | |
7917 | u64 *p = bb->page; | |
7918 | int i; | |
7919 | for (i = 0; i < bb->count ; i++) { | |
7920 | if (!BB_ACK(p[i])) { | |
7921 | sector_t start = BB_OFFSET(p[i]); | |
7922 | int len = BB_LEN(p[i]); | |
7923 | p[i] = BB_MAKE(start, len, 1); | |
7924 | } | |
7925 | } | |
7926 | } | |
7927 | write_sequnlock_irq(&bb->lock); | |
7928 | } | |
7929 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
7930 | ||
16c791a5 N |
7931 | /* sysfs access to bad-blocks list. |
7932 | * We present two files. | |
7933 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
7934 | * are recorded as bad. The list is truncated to fit within | |
7935 | * the one-page limit of sysfs. | |
7936 | * Writing "sector length" to this file adds an acknowledged | |
7937 | * bad block list. | |
7938 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
7939 | * been acknowledged. Writing to this file adds bad blocks | |
7940 | * without acknowledging them. This is largely for testing. | |
7941 | */ | |
7942 | ||
7943 | static ssize_t | |
7944 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
7945 | { | |
7946 | size_t len; | |
7947 | int i; | |
7948 | u64 *p = bb->page; | |
7949 | unsigned seq; | |
7950 | ||
7951 | if (bb->shift < 0) | |
7952 | return 0; | |
7953 | ||
7954 | retry: | |
7955 | seq = read_seqbegin(&bb->lock); | |
7956 | ||
7957 | len = 0; | |
7958 | i = 0; | |
7959 | ||
7960 | while (len < PAGE_SIZE && i < bb->count) { | |
7961 | sector_t s = BB_OFFSET(p[i]); | |
7962 | unsigned int length = BB_LEN(p[i]); | |
7963 | int ack = BB_ACK(p[i]); | |
7964 | i++; | |
7965 | ||
7966 | if (unack && ack) | |
7967 | continue; | |
7968 | ||
7969 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
7970 | (unsigned long long)s << bb->shift, | |
7971 | length << bb->shift); | |
7972 | } | |
7973 | ||
7974 | if (read_seqretry(&bb->lock, seq)) | |
7975 | goto retry; | |
7976 | ||
7977 | return len; | |
7978 | } | |
7979 | ||
7980 | #define DO_DEBUG 1 | |
7981 | ||
7982 | static ssize_t | |
7983 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
7984 | { | |
7985 | unsigned long long sector; | |
7986 | int length; | |
7987 | char newline; | |
7988 | #ifdef DO_DEBUG | |
7989 | /* Allow clearing via sysfs *only* for testing/debugging. | |
7990 | * Normally only a successful write may clear a badblock | |
7991 | */ | |
7992 | int clear = 0; | |
7993 | if (page[0] == '-') { | |
7994 | clear = 1; | |
7995 | page++; | |
7996 | } | |
7997 | #endif /* DO_DEBUG */ | |
7998 | ||
7999 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
8000 | case 3: | |
8001 | if (newline != '\n') | |
8002 | return -EINVAL; | |
8003 | case 2: | |
8004 | if (length <= 0) | |
8005 | return -EINVAL; | |
8006 | break; | |
8007 | default: | |
8008 | return -EINVAL; | |
8009 | } | |
8010 | ||
8011 | #ifdef DO_DEBUG | |
8012 | if (clear) { | |
8013 | md_clear_badblocks(bb, sector, length); | |
8014 | return len; | |
8015 | } | |
8016 | #endif /* DO_DEBUG */ | |
8017 | if (md_set_badblocks(bb, sector, length, !unack)) | |
8018 | return len; | |
8019 | else | |
8020 | return -ENOSPC; | |
8021 | } | |
8022 | ||
75c96f85 AB |
8023 | static int md_notify_reboot(struct notifier_block *this, |
8024 | unsigned long code, void *x) | |
1da177e4 LT |
8025 | { |
8026 | struct list_head *tmp; | |
8027 | mddev_t *mddev; | |
8028 | ||
8029 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
8030 | ||
8031 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
8032 | ||
29ac4aa3 | 8033 | for_each_mddev(mddev, tmp) |
c71d4887 | 8034 | if (mddev_trylock(mddev)) { |
2b25000b N |
8035 | /* Force a switch to readonly even array |
8036 | * appears to still be in use. Hence | |
8037 | * the '100'. | |
8038 | */ | |
a4bd82d0 | 8039 | md_set_readonly(mddev, 100); |
c71d4887 NB |
8040 | mddev_unlock(mddev); |
8041 | } | |
1da177e4 LT |
8042 | /* |
8043 | * certain more exotic SCSI devices are known to be | |
8044 | * volatile wrt too early system reboots. While the | |
8045 | * right place to handle this issue is the given | |
8046 | * driver, we do want to have a safe RAID driver ... | |
8047 | */ | |
8048 | mdelay(1000*1); | |
8049 | } | |
8050 | return NOTIFY_DONE; | |
8051 | } | |
8052 | ||
75c96f85 | 8053 | static struct notifier_block md_notifier = { |
1da177e4 LT |
8054 | .notifier_call = md_notify_reboot, |
8055 | .next = NULL, | |
8056 | .priority = INT_MAX, /* before any real devices */ | |
8057 | }; | |
8058 | ||
8059 | static void md_geninit(void) | |
8060 | { | |
1da177e4 LT |
8061 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
8062 | ||
c7705f34 | 8063 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
8064 | } |
8065 | ||
75c96f85 | 8066 | static int __init md_init(void) |
1da177e4 | 8067 | { |
e804ac78 TH |
8068 | int ret = -ENOMEM; |
8069 | ||
ada609ee | 8070 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8071 | if (!md_wq) |
8072 | goto err_wq; | |
8073 | ||
8074 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8075 | if (!md_misc_wq) | |
8076 | goto err_misc_wq; | |
8077 | ||
8078 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8079 | goto err_md; | |
8080 | ||
8081 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8082 | goto err_mdp; | |
8083 | mdp_major = ret; | |
8084 | ||
3dbd8c2e | 8085 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
8086 | md_probe, NULL, NULL); |
8087 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8088 | md_probe, NULL, NULL); |
8089 | ||
1da177e4 | 8090 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8091 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8092 | |
8093 | md_geninit(); | |
d710e138 | 8094 | return 0; |
1da177e4 | 8095 | |
e804ac78 TH |
8096 | err_mdp: |
8097 | unregister_blkdev(MD_MAJOR, "md"); | |
8098 | err_md: | |
8099 | destroy_workqueue(md_misc_wq); | |
8100 | err_misc_wq: | |
8101 | destroy_workqueue(md_wq); | |
8102 | err_wq: | |
8103 | return ret; | |
8104 | } | |
1da177e4 LT |
8105 | |
8106 | #ifndef MODULE | |
8107 | ||
8108 | /* | |
8109 | * Searches all registered partitions for autorun RAID arrays | |
8110 | * at boot time. | |
8111 | */ | |
4d936ec1 ME |
8112 | |
8113 | static LIST_HEAD(all_detected_devices); | |
8114 | struct detected_devices_node { | |
8115 | struct list_head list; | |
8116 | dev_t dev; | |
8117 | }; | |
1da177e4 LT |
8118 | |
8119 | void md_autodetect_dev(dev_t dev) | |
8120 | { | |
4d936ec1 ME |
8121 | struct detected_devices_node *node_detected_dev; |
8122 | ||
8123 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8124 | if (node_detected_dev) { | |
8125 | node_detected_dev->dev = dev; | |
8126 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8127 | } else { | |
8128 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8129 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8130 | } | |
1da177e4 LT |
8131 | } |
8132 | ||
8133 | ||
8134 | static void autostart_arrays(int part) | |
8135 | { | |
8136 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
8137 | struct detected_devices_node *node_detected_dev; |
8138 | dev_t dev; | |
8139 | int i_scanned, i_passed; | |
1da177e4 | 8140 | |
4d936ec1 ME |
8141 | i_scanned = 0; |
8142 | i_passed = 0; | |
1da177e4 | 8143 | |
4d936ec1 | 8144 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8145 | |
4d936ec1 ME |
8146 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8147 | i_scanned++; | |
8148 | node_detected_dev = list_entry(all_detected_devices.next, | |
8149 | struct detected_devices_node, list); | |
8150 | list_del(&node_detected_dev->list); | |
8151 | dev = node_detected_dev->dev; | |
8152 | kfree(node_detected_dev); | |
df968c4e | 8153 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8154 | if (IS_ERR(rdev)) |
8155 | continue; | |
8156 | ||
b2d444d7 | 8157 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
8158 | MD_BUG(); |
8159 | continue; | |
8160 | } | |
d0fae18f | 8161 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8162 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8163 | i_passed++; |
1da177e4 | 8164 | } |
4d936ec1 ME |
8165 | |
8166 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8167 | i_scanned, i_passed); | |
1da177e4 LT |
8168 | |
8169 | autorun_devices(part); | |
8170 | } | |
8171 | ||
fdee8ae4 | 8172 | #endif /* !MODULE */ |
1da177e4 LT |
8173 | |
8174 | static __exit void md_exit(void) | |
8175 | { | |
8176 | mddev_t *mddev; | |
8177 | struct list_head *tmp; | |
8ab5e4c1 | 8178 | |
3dbd8c2e | 8179 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 8180 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8181 | |
3dbd8c2e | 8182 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8183 | unregister_blkdev(mdp_major, "mdp"); |
8184 | unregister_reboot_notifier(&md_notifier); | |
8185 | unregister_sysctl_table(raid_table_header); | |
8186 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 8187 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8188 | export_array(mddev); |
d3374825 | 8189 | mddev->hold_active = 0; |
1da177e4 | 8190 | } |
e804ac78 TH |
8191 | destroy_workqueue(md_misc_wq); |
8192 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8193 | } |
8194 | ||
685784aa | 8195 | subsys_initcall(md_init); |
1da177e4 LT |
8196 | module_exit(md_exit) |
8197 | ||
f91de92e N |
8198 | static int get_ro(char *buffer, struct kernel_param *kp) |
8199 | { | |
8200 | return sprintf(buffer, "%d", start_readonly); | |
8201 | } | |
8202 | static int set_ro(const char *val, struct kernel_param *kp) | |
8203 | { | |
8204 | char *e; | |
8205 | int num = simple_strtoul(val, &e, 10); | |
8206 | if (*val && (*e == '\0' || *e == '\n')) { | |
8207 | start_readonly = num; | |
4dbcdc75 | 8208 | return 0; |
f91de92e N |
8209 | } |
8210 | return -EINVAL; | |
8211 | } | |
8212 | ||
80ca3a44 N |
8213 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8214 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 8215 | |
efeb53c0 | 8216 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8217 | |
1da177e4 LT |
8218 | EXPORT_SYMBOL(register_md_personality); |
8219 | EXPORT_SYMBOL(unregister_md_personality); | |
8220 | EXPORT_SYMBOL(md_error); | |
8221 | EXPORT_SYMBOL(md_done_sync); | |
8222 | EXPORT_SYMBOL(md_write_start); | |
8223 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
8224 | EXPORT_SYMBOL(md_register_thread); |
8225 | EXPORT_SYMBOL(md_unregister_thread); | |
8226 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
8227 | EXPORT_SYMBOL(md_check_recovery); |
8228 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8229 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8230 | MODULE_ALIAS("md"); |
72008652 | 8231 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |