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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 | ||
d7603b7e N |
218 | /* |
219 | * We have a system wide 'event count' that is incremented | |
220 | * on any 'interesting' event, and readers of /proc/mdstat | |
221 | * can use 'poll' or 'select' to find out when the event | |
222 | * count increases. | |
223 | * | |
224 | * Events are: | |
225 | * start array, stop array, error, add device, remove device, | |
226 | * start build, activate spare | |
227 | */ | |
2989ddbd | 228 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 229 | static atomic_t md_event_count; |
29269553 | 230 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
231 | { |
232 | atomic_inc(&md_event_count); | |
233 | wake_up(&md_event_waiters); | |
234 | } | |
29269553 | 235 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 236 | |
c331eb04 N |
237 | /* Alternate version that can be called from interrupts |
238 | * when calling sysfs_notify isn't needed. | |
239 | */ | |
05381954 | 240 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
241 | { |
242 | atomic_inc(&md_event_count); | |
243 | wake_up(&md_event_waiters); | |
244 | } | |
245 | ||
1da177e4 LT |
246 | /* |
247 | * Enables to iterate over all existing md arrays | |
248 | * all_mddevs_lock protects this list. | |
249 | */ | |
250 | static LIST_HEAD(all_mddevs); | |
251 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
252 | ||
253 | ||
254 | /* | |
255 | * iterates through all used mddevs in the system. | |
256 | * We take care to grab the all_mddevs_lock whenever navigating | |
257 | * the list, and to always hold a refcount when unlocked. | |
258 | * Any code which breaks out of this loop while own | |
259 | * a reference to the current mddev and must mddev_put it. | |
260 | */ | |
29ac4aa3 | 261 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
262 | \ |
263 | for (({ spin_lock(&all_mddevs_lock); \ | |
264 | tmp = all_mddevs.next; \ | |
265 | mddev = NULL;}); \ | |
266 | ({ if (tmp != &all_mddevs) \ | |
267 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
268 | spin_unlock(&all_mddevs_lock); \ | |
269 | if (mddev) mddev_put(mddev); \ | |
270 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
271 | tmp != &all_mddevs;}); \ | |
272 | ({ spin_lock(&all_mddevs_lock); \ | |
273 | tmp = tmp->next;}) \ | |
274 | ) | |
275 | ||
276 | ||
409c57f3 N |
277 | /* Rather than calling directly into the personality make_request function, |
278 | * IO requests come here first so that we can check if the device is | |
279 | * being suspended pending a reconfiguration. | |
280 | * We hold a refcount over the call to ->make_request. By the time that | |
281 | * call has finished, the bio has been linked into some internal structure | |
282 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
283 | */ | |
284 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 285 | { |
49077326 | 286 | const int rw = bio_data_dir(bio); |
409c57f3 N |
287 | mddev_t *mddev = q->queuedata; |
288 | int rv; | |
49077326 | 289 | int cpu; |
e91ece55 | 290 | unsigned int sectors; |
49077326 | 291 | |
0ca69886 N |
292 | if (mddev == NULL || mddev->pers == NULL |
293 | || !mddev->ready) { | |
409c57f3 N |
294 | bio_io_error(bio); |
295 | return 0; | |
296 | } | |
0ca69886 | 297 | smp_rmb(); /* Ensure implications of 'active' are visible */ |
409c57f3 | 298 | rcu_read_lock(); |
e9c7469b | 299 | if (mddev->suspended) { |
409c57f3 N |
300 | DEFINE_WAIT(__wait); |
301 | for (;;) { | |
302 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
303 | TASK_UNINTERRUPTIBLE); | |
e9c7469b | 304 | if (!mddev->suspended) |
409c57f3 N |
305 | break; |
306 | rcu_read_unlock(); | |
307 | schedule(); | |
308 | rcu_read_lock(); | |
309 | } | |
310 | finish_wait(&mddev->sb_wait, &__wait); | |
311 | } | |
312 | atomic_inc(&mddev->active_io); | |
313 | rcu_read_unlock(); | |
49077326 | 314 | |
e91ece55 CM |
315 | /* |
316 | * save the sectors now since our bio can | |
317 | * go away inside make_request | |
318 | */ | |
319 | sectors = bio_sectors(bio); | |
21a52c6d | 320 | rv = mddev->pers->make_request(mddev, bio); |
49077326 N |
321 | |
322 | cpu = part_stat_lock(); | |
323 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
e91ece55 | 324 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], sectors); |
49077326 N |
325 | part_stat_unlock(); |
326 | ||
409c57f3 N |
327 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
328 | wake_up(&mddev->sb_wait); | |
329 | ||
330 | return rv; | |
331 | } | |
332 | ||
9e35b99c N |
333 | /* mddev_suspend makes sure no new requests are submitted |
334 | * to the device, and that any requests that have been submitted | |
335 | * are completely handled. | |
336 | * Once ->stop is called and completes, the module will be completely | |
337 | * unused. | |
338 | */ | |
390ee602 | 339 | void mddev_suspend(mddev_t *mddev) |
409c57f3 N |
340 | { |
341 | BUG_ON(mddev->suspended); | |
342 | mddev->suspended = 1; | |
343 | synchronize_rcu(); | |
344 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
345 | mddev->pers->quiesce(mddev, 1); | |
409c57f3 | 346 | } |
390ee602 | 347 | EXPORT_SYMBOL_GPL(mddev_suspend); |
409c57f3 | 348 | |
390ee602 | 349 | void mddev_resume(mddev_t *mddev) |
409c57f3 N |
350 | { |
351 | mddev->suspended = 0; | |
352 | wake_up(&mddev->sb_wait); | |
353 | mddev->pers->quiesce(mddev, 0); | |
0fd018af JB |
354 | |
355 | md_wakeup_thread(mddev->thread); | |
356 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
1da177e4 | 357 | } |
390ee602 | 358 | EXPORT_SYMBOL_GPL(mddev_resume); |
1da177e4 | 359 | |
3fa841d7 N |
360 | int mddev_congested(mddev_t *mddev, int bits) |
361 | { | |
362 | return mddev->suspended; | |
363 | } | |
364 | EXPORT_SYMBOL(mddev_congested); | |
365 | ||
a2826aa9 | 366 | /* |
e9c7469b | 367 | * Generic flush handling for md |
a2826aa9 N |
368 | */ |
369 | ||
e9c7469b | 370 | static void md_end_flush(struct bio *bio, int err) |
a2826aa9 N |
371 | { |
372 | mdk_rdev_t *rdev = bio->bi_private; | |
373 | mddev_t *mddev = rdev->mddev; | |
a2826aa9 N |
374 | |
375 | rdev_dec_pending(rdev, mddev); | |
376 | ||
377 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
e9c7469b | 378 | /* The pre-request flush has finished */ |
e804ac78 | 379 | queue_work(md_wq, &mddev->flush_work); |
a2826aa9 N |
380 | } |
381 | bio_put(bio); | |
382 | } | |
383 | ||
a7a07e69 N |
384 | static void md_submit_flush_data(struct work_struct *ws); |
385 | ||
a035fc3e | 386 | static void submit_flushes(struct work_struct *ws) |
a2826aa9 | 387 | { |
a035fc3e | 388 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
a2826aa9 N |
389 | mdk_rdev_t *rdev; |
390 | ||
a7a07e69 N |
391 | INIT_WORK(&mddev->flush_work, md_submit_flush_data); |
392 | atomic_set(&mddev->flush_pending, 1); | |
a2826aa9 N |
393 | rcu_read_lock(); |
394 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
395 | if (rdev->raid_disk >= 0 && | |
396 | !test_bit(Faulty, &rdev->flags)) { | |
397 | /* Take two references, one is dropped | |
398 | * when request finishes, one after | |
399 | * we reclaim rcu_read_lock | |
400 | */ | |
401 | struct bio *bi; | |
402 | atomic_inc(&rdev->nr_pending); | |
403 | atomic_inc(&rdev->nr_pending); | |
404 | rcu_read_unlock(); | |
a167f663 | 405 | bi = bio_alloc_mddev(GFP_KERNEL, 0, mddev); |
e9c7469b | 406 | bi->bi_end_io = md_end_flush; |
a2826aa9 N |
407 | bi->bi_private = rdev; |
408 | bi->bi_bdev = rdev->bdev; | |
409 | atomic_inc(&mddev->flush_pending); | |
e9c7469b | 410 | submit_bio(WRITE_FLUSH, bi); |
a2826aa9 N |
411 | rcu_read_lock(); |
412 | rdev_dec_pending(rdev, mddev); | |
413 | } | |
414 | rcu_read_unlock(); | |
a7a07e69 N |
415 | if (atomic_dec_and_test(&mddev->flush_pending)) |
416 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 N |
417 | } |
418 | ||
e9c7469b | 419 | static void md_submit_flush_data(struct work_struct *ws) |
a2826aa9 | 420 | { |
e9c7469b TH |
421 | mddev_t *mddev = container_of(ws, mddev_t, flush_work); |
422 | struct bio *bio = mddev->flush_bio; | |
a2826aa9 | 423 | |
e9c7469b | 424 | if (bio->bi_size == 0) |
a2826aa9 N |
425 | /* an empty barrier - all done */ |
426 | bio_endio(bio, 0); | |
427 | else { | |
e9c7469b | 428 | bio->bi_rw &= ~REQ_FLUSH; |
21a52c6d | 429 | if (mddev->pers->make_request(mddev, bio)) |
a2826aa9 | 430 | generic_make_request(bio); |
a2826aa9 | 431 | } |
2b74e12e N |
432 | |
433 | mddev->flush_bio = NULL; | |
434 | wake_up(&mddev->sb_wait); | |
a2826aa9 N |
435 | } |
436 | ||
e9c7469b | 437 | void md_flush_request(mddev_t *mddev, struct bio *bio) |
a2826aa9 N |
438 | { |
439 | spin_lock_irq(&mddev->write_lock); | |
440 | wait_event_lock_irq(mddev->sb_wait, | |
e9c7469b | 441 | !mddev->flush_bio, |
a2826aa9 | 442 | mddev->write_lock, /*nothing*/); |
e9c7469b | 443 | mddev->flush_bio = bio; |
a2826aa9 N |
444 | spin_unlock_irq(&mddev->write_lock); |
445 | ||
a035fc3e N |
446 | INIT_WORK(&mddev->flush_work, submit_flushes); |
447 | queue_work(md_wq, &mddev->flush_work); | |
a2826aa9 | 448 | } |
e9c7469b | 449 | EXPORT_SYMBOL(md_flush_request); |
409c57f3 | 450 | |
97658cdd N |
451 | /* Support for plugging. |
452 | * This mirrors the plugging support in request_queue, but does not | |
453 | * require having a whole queue or request structures. | |
454 | * We allocate an md_plug_cb for each md device and each thread it gets | |
455 | * plugged on. This links tot the private plug_handle structure in the | |
456 | * personality data where we keep a count of the number of outstanding | |
457 | * plugs so other code can see if a plug is active. | |
458 | */ | |
459 | struct md_plug_cb { | |
460 | struct blk_plug_cb cb; | |
461 | mddev_t *mddev; | |
462 | }; | |
463 | ||
464 | static void plugger_unplug(struct blk_plug_cb *cb) | |
465 | { | |
466 | struct md_plug_cb *mdcb = container_of(cb, struct md_plug_cb, cb); | |
467 | if (atomic_dec_and_test(&mdcb->mddev->plug_cnt)) | |
468 | md_wakeup_thread(mdcb->mddev->thread); | |
469 | kfree(mdcb); | |
470 | } | |
471 | ||
472 | /* Check that an unplug wakeup will come shortly. | |
473 | * If not, wakeup the md thread immediately | |
474 | */ | |
475 | int mddev_check_plugged(mddev_t *mddev) | |
476 | { | |
477 | struct blk_plug *plug = current->plug; | |
478 | struct md_plug_cb *mdcb; | |
479 | ||
480 | if (!plug) | |
481 | return 0; | |
482 | ||
483 | list_for_each_entry(mdcb, &plug->cb_list, cb.list) { | |
484 | if (mdcb->cb.callback == plugger_unplug && | |
485 | mdcb->mddev == mddev) { | |
486 | /* Already on the list, move to top */ | |
487 | if (mdcb != list_first_entry(&plug->cb_list, | |
488 | struct md_plug_cb, | |
489 | cb.list)) | |
490 | list_move(&mdcb->cb.list, &plug->cb_list); | |
491 | return 1; | |
492 | } | |
493 | } | |
494 | /* Not currently on the callback list */ | |
495 | mdcb = kmalloc(sizeof(*mdcb), GFP_ATOMIC); | |
496 | if (!mdcb) | |
497 | return 0; | |
498 | ||
499 | mdcb->mddev = mddev; | |
500 | mdcb->cb.callback = plugger_unplug; | |
501 | atomic_inc(&mddev->plug_cnt); | |
502 | list_add(&mdcb->cb.list, &plug->cb_list); | |
503 | return 1; | |
504 | } | |
505 | EXPORT_SYMBOL_GPL(mddev_check_plugged); | |
2ac87401 | 506 | |
1da177e4 LT |
507 | static inline mddev_t *mddev_get(mddev_t *mddev) |
508 | { | |
509 | atomic_inc(&mddev->active); | |
510 | return mddev; | |
511 | } | |
512 | ||
5fd3a17e | 513 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 514 | |
1da177e4 LT |
515 | static void mddev_put(mddev_t *mddev) |
516 | { | |
a167f663 N |
517 | struct bio_set *bs = NULL; |
518 | ||
1da177e4 LT |
519 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) |
520 | return; | |
d3374825 | 521 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
522 | mddev->ctime == 0 && !mddev->hold_active) { |
523 | /* Array is not configured at all, and not held active, | |
524 | * so destroy it */ | |
1da177e4 | 525 | list_del(&mddev->all_mddevs); |
a167f663 N |
526 | bs = mddev->bio_set; |
527 | mddev->bio_set = NULL; | |
d3374825 | 528 | if (mddev->gendisk) { |
e804ac78 TH |
529 | /* We did a probe so need to clean up. Call |
530 | * queue_work inside the spinlock so that | |
531 | * flush_workqueue() after mddev_find will | |
532 | * succeed in waiting for the work to be done. | |
d3374825 N |
533 | */ |
534 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
e804ac78 | 535 | queue_work(md_misc_wq, &mddev->del_work); |
d3374825 N |
536 | } else |
537 | kfree(mddev); | |
538 | } | |
539 | spin_unlock(&all_mddevs_lock); | |
a167f663 N |
540 | if (bs) |
541 | bioset_free(bs); | |
1da177e4 LT |
542 | } |
543 | ||
390ee602 | 544 | void mddev_init(mddev_t *mddev) |
fafd7fb0 N |
545 | { |
546 | mutex_init(&mddev->open_mutex); | |
547 | mutex_init(&mddev->reconfig_mutex); | |
548 | mutex_init(&mddev->bitmap_info.mutex); | |
549 | INIT_LIST_HEAD(&mddev->disks); | |
550 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
551 | init_timer(&mddev->safemode_timer); | |
552 | atomic_set(&mddev->active, 1); | |
553 | atomic_set(&mddev->openers, 0); | |
554 | atomic_set(&mddev->active_io, 0); | |
97658cdd | 555 | atomic_set(&mddev->plug_cnt, 0); |
fafd7fb0 N |
556 | spin_lock_init(&mddev->write_lock); |
557 | atomic_set(&mddev->flush_pending, 0); | |
558 | init_waitqueue_head(&mddev->sb_wait); | |
559 | init_waitqueue_head(&mddev->recovery_wait); | |
560 | mddev->reshape_position = MaxSector; | |
561 | mddev->resync_min = 0; | |
562 | mddev->resync_max = MaxSector; | |
563 | mddev->level = LEVEL_NONE; | |
564 | } | |
390ee602 | 565 | EXPORT_SYMBOL_GPL(mddev_init); |
fafd7fb0 | 566 | |
1da177e4 LT |
567 | static mddev_t * mddev_find(dev_t unit) |
568 | { | |
569 | mddev_t *mddev, *new = NULL; | |
570 | ||
8f5f02c4 N |
571 | if (unit && MAJOR(unit) != MD_MAJOR) |
572 | unit &= ~((1<<MdpMinorShift)-1); | |
573 | ||
1da177e4 LT |
574 | retry: |
575 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
576 | |
577 | if (unit) { | |
578 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
579 | if (mddev->unit == unit) { | |
580 | mddev_get(mddev); | |
581 | spin_unlock(&all_mddevs_lock); | |
582 | kfree(new); | |
583 | return mddev; | |
584 | } | |
585 | ||
586 | if (new) { | |
587 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 588 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
589 | new->hold_active = UNTIL_IOCTL; |
590 | return new; | |
1da177e4 | 591 | } |
efeb53c0 N |
592 | } else if (new) { |
593 | /* find an unused unit number */ | |
594 | static int next_minor = 512; | |
595 | int start = next_minor; | |
596 | int is_free = 0; | |
597 | int dev = 0; | |
598 | while (!is_free) { | |
599 | dev = MKDEV(MD_MAJOR, next_minor); | |
600 | next_minor++; | |
601 | if (next_minor > MINORMASK) | |
602 | next_minor = 0; | |
603 | if (next_minor == start) { | |
604 | /* Oh dear, all in use. */ | |
605 | spin_unlock(&all_mddevs_lock); | |
606 | kfree(new); | |
607 | return NULL; | |
608 | } | |
609 | ||
610 | is_free = 1; | |
611 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
612 | if (mddev->unit == dev) { | |
613 | is_free = 0; | |
614 | break; | |
615 | } | |
616 | } | |
617 | new->unit = dev; | |
618 | new->md_minor = MINOR(dev); | |
619 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
620 | list_add(&new->all_mddevs, &all_mddevs); |
621 | spin_unlock(&all_mddevs_lock); | |
622 | return new; | |
623 | } | |
624 | spin_unlock(&all_mddevs_lock); | |
625 | ||
9ffae0cf | 626 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
627 | if (!new) |
628 | return NULL; | |
629 | ||
1da177e4 LT |
630 | new->unit = unit; |
631 | if (MAJOR(unit) == MD_MAJOR) | |
632 | new->md_minor = MINOR(unit); | |
633 | else | |
634 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
635 | ||
fafd7fb0 | 636 | mddev_init(new); |
1da177e4 | 637 | |
1da177e4 LT |
638 | goto retry; |
639 | } | |
640 | ||
641 | static inline int mddev_lock(mddev_t * mddev) | |
642 | { | |
df5b89b3 | 643 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
644 | } |
645 | ||
b522adcd DW |
646 | static inline int mddev_is_locked(mddev_t *mddev) |
647 | { | |
648 | return mutex_is_locked(&mddev->reconfig_mutex); | |
649 | } | |
650 | ||
1da177e4 LT |
651 | static inline int mddev_trylock(mddev_t * mddev) |
652 | { | |
df5b89b3 | 653 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
654 | } |
655 | ||
b6eb127d N |
656 | static struct attribute_group md_redundancy_group; |
657 | ||
a64c876f | 658 | static void mddev_unlock(mddev_t * mddev) |
1da177e4 | 659 | { |
a64c876f | 660 | if (mddev->to_remove) { |
b6eb127d N |
661 | /* These cannot be removed under reconfig_mutex as |
662 | * an access to the files will try to take reconfig_mutex | |
663 | * while holding the file unremovable, which leads to | |
664 | * a deadlock. | |
bb4f1e9d N |
665 | * So hold set sysfs_active while the remove in happeing, |
666 | * and anything else which might set ->to_remove or my | |
667 | * otherwise change the sysfs namespace will fail with | |
668 | * -EBUSY if sysfs_active is still set. | |
669 | * We set sysfs_active under reconfig_mutex and elsewhere | |
670 | * test it under the same mutex to ensure its correct value | |
671 | * is seen. | |
b6eb127d | 672 | */ |
a64c876f N |
673 | struct attribute_group *to_remove = mddev->to_remove; |
674 | mddev->to_remove = NULL; | |
bb4f1e9d | 675 | mddev->sysfs_active = 1; |
b6eb127d N |
676 | mutex_unlock(&mddev->reconfig_mutex); |
677 | ||
00bcb4ac N |
678 | if (mddev->kobj.sd) { |
679 | if (to_remove != &md_redundancy_group) | |
680 | sysfs_remove_group(&mddev->kobj, to_remove); | |
681 | if (mddev->pers == NULL || | |
682 | mddev->pers->sync_request == NULL) { | |
683 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
684 | if (mddev->sysfs_action) | |
685 | sysfs_put(mddev->sysfs_action); | |
686 | mddev->sysfs_action = NULL; | |
687 | } | |
a64c876f | 688 | } |
bb4f1e9d | 689 | mddev->sysfs_active = 0; |
b6eb127d N |
690 | } else |
691 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 692 | |
005eca5e | 693 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
694 | } |
695 | ||
2989ddbd | 696 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 697 | { |
159ec1fc | 698 | mdk_rdev_t *rdev; |
1da177e4 | 699 | |
159ec1fc | 700 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
701 | if (rdev->desc_nr == nr) |
702 | return rdev; | |
159ec1fc | 703 | |
1da177e4 LT |
704 | return NULL; |
705 | } | |
706 | ||
707 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
708 | { | |
1da177e4 LT |
709 | mdk_rdev_t *rdev; |
710 | ||
159ec1fc | 711 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
712 | if (rdev->bdev->bd_dev == dev) |
713 | return rdev; | |
159ec1fc | 714 | |
1da177e4 LT |
715 | return NULL; |
716 | } | |
717 | ||
d9d166c2 | 718 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
719 | { |
720 | struct mdk_personality *pers; | |
d9d166c2 N |
721 | list_for_each_entry(pers, &pers_list, list) { |
722 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 723 | return pers; |
d9d166c2 N |
724 | if (strcmp(pers->name, clevel)==0) |
725 | return pers; | |
726 | } | |
2604b703 N |
727 | return NULL; |
728 | } | |
729 | ||
b73df2d3 | 730 | /* return the offset of the super block in 512byte sectors */ |
57b2caa3 | 731 | static inline sector_t calc_dev_sboffset(mdk_rdev_t *rdev) |
1da177e4 | 732 | { |
57b2caa3 | 733 | sector_t num_sectors = i_size_read(rdev->bdev->bd_inode) / 512; |
b73df2d3 | 734 | return MD_NEW_SIZE_SECTORS(num_sectors); |
1da177e4 LT |
735 | } |
736 | ||
1da177e4 LT |
737 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
738 | { | |
739 | if (rdev->sb_page) | |
740 | MD_BUG(); | |
741 | ||
742 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
743 | if (!rdev->sb_page) { | |
744 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 745 | return -ENOMEM; |
1da177e4 LT |
746 | } |
747 | ||
748 | return 0; | |
749 | } | |
750 | ||
751 | static void free_disk_sb(mdk_rdev_t * rdev) | |
752 | { | |
753 | if (rdev->sb_page) { | |
2d1f3b5d | 754 | put_page(rdev->sb_page); |
1da177e4 LT |
755 | rdev->sb_loaded = 0; |
756 | rdev->sb_page = NULL; | |
0f420358 | 757 | rdev->sb_start = 0; |
dd8ac336 | 758 | rdev->sectors = 0; |
1da177e4 LT |
759 | } |
760 | } | |
761 | ||
762 | ||
6712ecf8 | 763 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
764 | { |
765 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 766 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 767 | |
3a0f5bbb N |
768 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
769 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
770 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
771 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 772 | md_error(mddev, rdev); |
3a0f5bbb | 773 | } |
7bfa19f2 | 774 | |
a9701a30 N |
775 | if (atomic_dec_and_test(&mddev->pending_writes)) |
776 | wake_up(&mddev->sb_wait); | |
f8b58edf | 777 | bio_put(bio); |
7bfa19f2 N |
778 | } |
779 | ||
780 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, | |
781 | sector_t sector, int size, struct page *page) | |
782 | { | |
783 | /* write first size bytes of page to sector of rdev | |
784 | * Increment mddev->pending_writes before returning | |
785 | * and decrement it on completion, waking up sb_wait | |
786 | * if zero is reached. | |
787 | * If an error occurred, call md_error | |
788 | */ | |
a167f663 | 789 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 790 | |
a6ff7e08 | 791 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
7bfa19f2 N |
792 | bio->bi_sector = sector; |
793 | bio_add_page(bio, page, size, 0); | |
794 | bio->bi_private = rdev; | |
795 | bio->bi_end_io = super_written; | |
a9701a30 | 796 | |
7bfa19f2 | 797 | atomic_inc(&mddev->pending_writes); |
721a9602 | 798 | submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio); |
a9701a30 N |
799 | } |
800 | ||
801 | void md_super_wait(mddev_t *mddev) | |
802 | { | |
e9c7469b | 803 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
804 | DEFINE_WAIT(wq); |
805 | for(;;) { | |
806 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
807 | if (atomic_read(&mddev->pending_writes)==0) | |
808 | break; | |
a9701a30 N |
809 | schedule(); |
810 | } | |
811 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
812 | } |
813 | ||
6712ecf8 | 814 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 815 | { |
1da177e4 | 816 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
817 | } |
818 | ||
2b193363 | 819 | int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size, |
ccebd4c4 | 820 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 821 | { |
a167f663 | 822 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
823 | struct completion event; |
824 | int ret; | |
825 | ||
721a9602 | 826 | rw |= REQ_SYNC; |
1da177e4 | 827 | |
a6ff7e08 JB |
828 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
829 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 JB |
830 | if (metadata_op) |
831 | bio->bi_sector = sector + rdev->sb_start; | |
832 | else | |
833 | bio->bi_sector = sector + rdev->data_offset; | |
1da177e4 LT |
834 | bio_add_page(bio, page, size, 0); |
835 | init_completion(&event); | |
836 | bio->bi_private = &event; | |
837 | bio->bi_end_io = bi_complete; | |
838 | submit_bio(rw, bio); | |
839 | wait_for_completion(&event); | |
840 | ||
841 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
842 | bio_put(bio); | |
843 | return ret; | |
844 | } | |
a8745db2 | 845 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 846 | |
0002b271 | 847 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
848 | { |
849 | char b[BDEVNAME_SIZE]; | |
850 | if (!rdev->sb_page) { | |
851 | MD_BUG(); | |
852 | return -EINVAL; | |
853 | } | |
854 | if (rdev->sb_loaded) | |
855 | return 0; | |
856 | ||
857 | ||
ccebd4c4 | 858 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
859 | goto fail; |
860 | rdev->sb_loaded = 1; | |
861 | return 0; | |
862 | ||
863 | fail: | |
864 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
865 | bdevname(rdev->bdev,b)); | |
866 | return -EINVAL; | |
867 | } | |
868 | ||
869 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
870 | { | |
05710466 AN |
871 | return sb1->set_uuid0 == sb2->set_uuid0 && |
872 | sb1->set_uuid1 == sb2->set_uuid1 && | |
873 | sb1->set_uuid2 == sb2->set_uuid2 && | |
874 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
875 | } |
876 | ||
1da177e4 LT |
877 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
878 | { | |
879 | int ret; | |
880 | mdp_super_t *tmp1, *tmp2; | |
881 | ||
882 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
883 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
884 | ||
885 | if (!tmp1 || !tmp2) { | |
886 | ret = 0; | |
35020f1a | 887 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
888 | goto abort; |
889 | } | |
890 | ||
891 | *tmp1 = *sb1; | |
892 | *tmp2 = *sb2; | |
893 | ||
894 | /* | |
895 | * nr_disks is not constant | |
896 | */ | |
897 | tmp1->nr_disks = 0; | |
898 | tmp2->nr_disks = 0; | |
899 | ||
ce0c8e05 | 900 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 901 | abort: |
990a8baf JJ |
902 | kfree(tmp1); |
903 | kfree(tmp2); | |
1da177e4 LT |
904 | return ret; |
905 | } | |
906 | ||
4d167f09 N |
907 | |
908 | static u32 md_csum_fold(u32 csum) | |
909 | { | |
910 | csum = (csum & 0xffff) + (csum >> 16); | |
911 | return (csum & 0xffff) + (csum >> 16); | |
912 | } | |
913 | ||
1da177e4 LT |
914 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
915 | { | |
4d167f09 N |
916 | u64 newcsum = 0; |
917 | u32 *sb32 = (u32*)sb; | |
918 | int i; | |
1da177e4 LT |
919 | unsigned int disk_csum, csum; |
920 | ||
921 | disk_csum = sb->sb_csum; | |
922 | sb->sb_csum = 0; | |
4d167f09 N |
923 | |
924 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
925 | newcsum += sb32[i]; | |
926 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
927 | ||
928 | ||
929 | #ifdef CONFIG_ALPHA | |
930 | /* This used to use csum_partial, which was wrong for several | |
931 | * reasons including that different results are returned on | |
932 | * different architectures. It isn't critical that we get exactly | |
933 | * the same return value as before (we always csum_fold before | |
934 | * testing, and that removes any differences). However as we | |
935 | * know that csum_partial always returned a 16bit value on | |
936 | * alphas, do a fold to maximise conformity to previous behaviour. | |
937 | */ | |
938 | sb->sb_csum = md_csum_fold(disk_csum); | |
939 | #else | |
1da177e4 | 940 | sb->sb_csum = disk_csum; |
4d167f09 | 941 | #endif |
1da177e4 LT |
942 | return csum; |
943 | } | |
944 | ||
945 | ||
946 | /* | |
947 | * Handle superblock details. | |
948 | * We want to be able to handle multiple superblock formats | |
949 | * so we have a common interface to them all, and an array of | |
950 | * different handlers. | |
951 | * We rely on user-space to write the initial superblock, and support | |
952 | * reading and updating of superblocks. | |
953 | * Interface methods are: | |
954 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
955 | * loads and validates a superblock on dev. | |
956 | * if refdev != NULL, compare superblocks on both devices | |
957 | * Return: | |
958 | * 0 - dev has a superblock that is compatible with refdev | |
959 | * 1 - dev has a superblock that is compatible and newer than refdev | |
960 | * so dev should be used as the refdev in future | |
961 | * -EINVAL superblock incompatible or invalid | |
962 | * -othererror e.g. -EIO | |
963 | * | |
964 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
965 | * Verify that dev is acceptable into mddev. | |
966 | * The first time, mddev->raid_disks will be 0, and data from | |
967 | * dev should be merged in. Subsequent calls check that dev | |
968 | * is new enough. Return 0 or -EINVAL | |
969 | * | |
970 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
971 | * Update the superblock for rdev with data in mddev | |
972 | * This does not write to disc. | |
973 | * | |
974 | */ | |
975 | ||
976 | struct super_type { | |
0cd17fec CW |
977 | char *name; |
978 | struct module *owner; | |
979 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
980 | int minor_version); | |
981 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
982 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
983 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 984 | sector_t num_sectors); |
1da177e4 LT |
985 | }; |
986 | ||
0894cc30 AN |
987 | /* |
988 | * Check that the given mddev has no bitmap. | |
989 | * | |
990 | * This function is called from the run method of all personalities that do not | |
991 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
992 | * has a bitmap. Otherwise, it returns 0. | |
993 | * | |
994 | */ | |
995 | int md_check_no_bitmap(mddev_t *mddev) | |
996 | { | |
c3d9714e | 997 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
998 | return 0; |
999 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
1000 | mdname(mddev), mddev->pers->name); | |
1001 | return 1; | |
1002 | } | |
1003 | EXPORT_SYMBOL(md_check_no_bitmap); | |
1004 | ||
1da177e4 LT |
1005 | /* |
1006 | * load_super for 0.90.0 | |
1007 | */ | |
1008 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1009 | { | |
1010 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
1011 | mdp_super_t *sb; | |
1012 | int ret; | |
1da177e4 LT |
1013 | |
1014 | /* | |
0f420358 | 1015 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
1016 | * it's at the end of the disk. |
1017 | * | |
1018 | * It also happens to be a multiple of 4Kb. | |
1019 | */ | |
57b2caa3 | 1020 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 1021 | |
0002b271 | 1022 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
1023 | if (ret) return ret; |
1024 | ||
1025 | ret = -EINVAL; | |
1026 | ||
1027 | bdevname(rdev->bdev, b); | |
65a06f06 | 1028 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1029 | |
1030 | if (sb->md_magic != MD_SB_MAGIC) { | |
1031 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
1032 | b); | |
1033 | goto abort; | |
1034 | } | |
1035 | ||
1036 | if (sb->major_version != 0 || | |
f6705578 N |
1037 | sb->minor_version < 90 || |
1038 | sb->minor_version > 91) { | |
1da177e4 LT |
1039 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1040 | sb->major_version, sb->minor_version, | |
1041 | b); | |
1042 | goto abort; | |
1043 | } | |
1044 | ||
1045 | if (sb->raid_disks <= 0) | |
1046 | goto abort; | |
1047 | ||
4d167f09 | 1048 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1049 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1050 | b); | |
1051 | goto abort; | |
1052 | } | |
1053 | ||
1054 | rdev->preferred_minor = sb->md_minor; | |
1055 | rdev->data_offset = 0; | |
0002b271 | 1056 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
1057 | |
1058 | if (sb->level == LEVEL_MULTIPATH) | |
1059 | rdev->desc_nr = -1; | |
1060 | else | |
1061 | rdev->desc_nr = sb->this_disk.number; | |
1062 | ||
9a7b2b0f | 1063 | if (!refdev) { |
1da177e4 | 1064 | ret = 1; |
9a7b2b0f | 1065 | } else { |
1da177e4 | 1066 | __u64 ev1, ev2; |
65a06f06 | 1067 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1068 | if (!uuid_equal(refsb, sb)) { |
1069 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1070 | b, bdevname(refdev->bdev,b2)); | |
1071 | goto abort; | |
1072 | } | |
1073 | if (!sb_equal(refsb, sb)) { | |
1074 | printk(KERN_WARNING "md: %s has same UUID" | |
1075 | " but different superblock to %s\n", | |
1076 | b, bdevname(refdev->bdev, b2)); | |
1077 | goto abort; | |
1078 | } | |
1079 | ev1 = md_event(sb); | |
1080 | ev2 = md_event(refsb); | |
1081 | if (ev1 > ev2) | |
1082 | ret = 1; | |
1083 | else | |
1084 | ret = 0; | |
1085 | } | |
8190e754 | 1086 | rdev->sectors = rdev->sb_start; |
1da177e4 | 1087 | |
dd8ac336 | 1088 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
1089 | /* "this cannot possibly happen" ... */ |
1090 | ret = -EINVAL; | |
1091 | ||
1da177e4 LT |
1092 | abort: |
1093 | return ret; | |
1094 | } | |
1095 | ||
1096 | /* | |
1097 | * validate_super for 0.90.0 | |
1098 | */ | |
1099 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1100 | { | |
1101 | mdp_disk_t *desc; | |
65a06f06 | 1102 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1103 | __u64 ev1 = md_event(sb); |
1da177e4 | 1104 | |
41158c7e | 1105 | rdev->raid_disk = -1; |
c5d79adb N |
1106 | clear_bit(Faulty, &rdev->flags); |
1107 | clear_bit(In_sync, &rdev->flags); | |
1108 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1109 | |
1da177e4 LT |
1110 | if (mddev->raid_disks == 0) { |
1111 | mddev->major_version = 0; | |
1112 | mddev->minor_version = sb->minor_version; | |
1113 | mddev->patch_version = sb->patch_version; | |
e691063a | 1114 | mddev->external = 0; |
9d8f0363 | 1115 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1116 | mddev->ctime = sb->ctime; |
1117 | mddev->utime = sb->utime; | |
1118 | mddev->level = sb->level; | |
d9d166c2 | 1119 | mddev->clevel[0] = 0; |
1da177e4 LT |
1120 | mddev->layout = sb->layout; |
1121 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 1122 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 1123 | mddev->events = ev1; |
c3d9714e N |
1124 | mddev->bitmap_info.offset = 0; |
1125 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1126 | |
f6705578 N |
1127 | if (mddev->minor_version >= 91) { |
1128 | mddev->reshape_position = sb->reshape_position; | |
1129 | mddev->delta_disks = sb->delta_disks; | |
1130 | mddev->new_level = sb->new_level; | |
1131 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1132 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1133 | } else { |
1134 | mddev->reshape_position = MaxSector; | |
1135 | mddev->delta_disks = 0; | |
1136 | mddev->new_level = mddev->level; | |
1137 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1138 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1139 | } |
1140 | ||
1da177e4 LT |
1141 | if (sb->state & (1<<MD_SB_CLEAN)) |
1142 | mddev->recovery_cp = MaxSector; | |
1143 | else { | |
1144 | if (sb->events_hi == sb->cp_events_hi && | |
1145 | sb->events_lo == sb->cp_events_lo) { | |
1146 | mddev->recovery_cp = sb->recovery_cp; | |
1147 | } else | |
1148 | mddev->recovery_cp = 0; | |
1149 | } | |
1150 | ||
1151 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1152 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1153 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1154 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1155 | ||
1156 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1157 | |
1158 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1159 | mddev->bitmap_info.file == NULL) |
1160 | mddev->bitmap_info.offset = | |
1161 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1162 | |
41158c7e | 1163 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1164 | /* Insist on good event counter while assembling, except |
1165 | * for spares (which don't need an event count) */ | |
1da177e4 | 1166 | ++ev1; |
be6800a7 N |
1167 | if (sb->disks[rdev->desc_nr].state & ( |
1168 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1169 | if (ev1 < mddev->events) | |
1170 | return -EINVAL; | |
41158c7e N |
1171 | } else if (mddev->bitmap) { |
1172 | /* if adding to array with a bitmap, then we can accept an | |
1173 | * older device ... but not too old. | |
1174 | */ | |
41158c7e N |
1175 | if (ev1 < mddev->bitmap->events_cleared) |
1176 | return 0; | |
07d84d10 N |
1177 | } else { |
1178 | if (ev1 < mddev->events) | |
1179 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1180 | return 0; | |
1181 | } | |
41158c7e | 1182 | |
1da177e4 | 1183 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1184 | desc = sb->disks + rdev->desc_nr; |
1185 | ||
1186 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1187 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1188 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1189 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1190 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1191 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1192 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1193 | /* active but not in sync implies recovery up to | |
1194 | * reshape position. We don't know exactly where | |
1195 | * that is, so set to zero for now */ | |
1196 | if (mddev->minor_version >= 91) { | |
1197 | rdev->recovery_offset = 0; | |
1198 | rdev->raid_disk = desc->raid_disk; | |
1199 | } | |
1da177e4 | 1200 | } |
8ddf9efe N |
1201 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1202 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1203 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1204 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1205 | return 0; |
1206 | } | |
1207 | ||
1208 | /* | |
1209 | * sync_super for 0.90.0 | |
1210 | */ | |
1211 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1212 | { | |
1213 | mdp_super_t *sb; | |
1da177e4 LT |
1214 | mdk_rdev_t *rdev2; |
1215 | int next_spare = mddev->raid_disks; | |
19133a42 | 1216 | |
1da177e4 LT |
1217 | |
1218 | /* make rdev->sb match mddev data.. | |
1219 | * | |
1220 | * 1/ zero out disks | |
1221 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1222 | * 3/ any empty disks < next_spare become removed | |
1223 | * | |
1224 | * disks[0] gets initialised to REMOVED because | |
1225 | * we cannot be sure from other fields if it has | |
1226 | * been initialised or not. | |
1227 | */ | |
1228 | int i; | |
1229 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1230 | ||
61181565 N |
1231 | rdev->sb_size = MD_SB_BYTES; |
1232 | ||
65a06f06 | 1233 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1234 | |
1235 | memset(sb, 0, sizeof(*sb)); | |
1236 | ||
1237 | sb->md_magic = MD_SB_MAGIC; | |
1238 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1239 | sb->patch_version = mddev->patch_version; |
1240 | sb->gvalid_words = 0; /* ignored */ | |
1241 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1242 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1243 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1244 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1245 | ||
1246 | sb->ctime = mddev->ctime; | |
1247 | sb->level = mddev->level; | |
58c0fed4 | 1248 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1249 | sb->raid_disks = mddev->raid_disks; |
1250 | sb->md_minor = mddev->md_minor; | |
e691063a | 1251 | sb->not_persistent = 0; |
1da177e4 LT |
1252 | sb->utime = mddev->utime; |
1253 | sb->state = 0; | |
1254 | sb->events_hi = (mddev->events>>32); | |
1255 | sb->events_lo = (u32)mddev->events; | |
1256 | ||
f6705578 N |
1257 | if (mddev->reshape_position == MaxSector) |
1258 | sb->minor_version = 90; | |
1259 | else { | |
1260 | sb->minor_version = 91; | |
1261 | sb->reshape_position = mddev->reshape_position; | |
1262 | sb->new_level = mddev->new_level; | |
1263 | sb->delta_disks = mddev->delta_disks; | |
1264 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1265 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1266 | } |
1267 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1268 | if (mddev->in_sync) |
1269 | { | |
1270 | sb->recovery_cp = mddev->recovery_cp; | |
1271 | sb->cp_events_hi = (mddev->events>>32); | |
1272 | sb->cp_events_lo = (u32)mddev->events; | |
1273 | if (mddev->recovery_cp == MaxSector) | |
1274 | sb->state = (1<< MD_SB_CLEAN); | |
1275 | } else | |
1276 | sb->recovery_cp = 0; | |
1277 | ||
1278 | sb->layout = mddev->layout; | |
9d8f0363 | 1279 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1280 | |
c3d9714e | 1281 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1282 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1283 | ||
1da177e4 | 1284 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1285 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1286 | mdp_disk_t *d; |
86e6ffdd | 1287 | int desc_nr; |
0261cd9f N |
1288 | int is_active = test_bit(In_sync, &rdev2->flags); |
1289 | ||
1290 | if (rdev2->raid_disk >= 0 && | |
1291 | sb->minor_version >= 91) | |
1292 | /* we have nowhere to store the recovery_offset, | |
1293 | * but if it is not below the reshape_position, | |
1294 | * we can piggy-back on that. | |
1295 | */ | |
1296 | is_active = 1; | |
1297 | if (rdev2->raid_disk < 0 || | |
1298 | test_bit(Faulty, &rdev2->flags)) | |
1299 | is_active = 0; | |
1300 | if (is_active) | |
86e6ffdd | 1301 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1302 | else |
86e6ffdd | 1303 | desc_nr = next_spare++; |
19133a42 | 1304 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1305 | d = &sb->disks[rdev2->desc_nr]; |
1306 | nr_disks++; | |
1307 | d->number = rdev2->desc_nr; | |
1308 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1309 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1310 | if (is_active) |
1da177e4 LT |
1311 | d->raid_disk = rdev2->raid_disk; |
1312 | else | |
1313 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1314 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1315 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1316 | else if (is_active) { |
1da177e4 | 1317 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1318 | if (test_bit(In_sync, &rdev2->flags)) |
1319 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1320 | active++; |
1321 | working++; | |
1322 | } else { | |
1323 | d->state = 0; | |
1324 | spare++; | |
1325 | working++; | |
1326 | } | |
8ddf9efe N |
1327 | if (test_bit(WriteMostly, &rdev2->flags)) |
1328 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1329 | } |
1da177e4 LT |
1330 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1331 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1332 | mdp_disk_t *d = &sb->disks[i]; | |
1333 | if (d->state == 0 && d->number == 0) { | |
1334 | d->number = i; | |
1335 | d->raid_disk = i; | |
1336 | d->state = (1<<MD_DISK_REMOVED); | |
1337 | d->state |= (1<<MD_DISK_FAULTY); | |
1338 | failed++; | |
1339 | } | |
1340 | } | |
1341 | sb->nr_disks = nr_disks; | |
1342 | sb->active_disks = active; | |
1343 | sb->working_disks = working; | |
1344 | sb->failed_disks = failed; | |
1345 | sb->spare_disks = spare; | |
1346 | ||
1347 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1348 | sb->sb_csum = calc_sb_csum(sb); | |
1349 | } | |
1350 | ||
0cd17fec CW |
1351 | /* |
1352 | * rdev_size_change for 0.90.0 | |
1353 | */ | |
1354 | static unsigned long long | |
15f4a5fd | 1355 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1356 | { |
58c0fed4 | 1357 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1358 | return 0; /* component must fit device */ |
c3d9714e | 1359 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1360 | return 0; /* can't move bitmap */ |
57b2caa3 | 1361 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1362 | if (!num_sectors || num_sectors > rdev->sb_start) |
1363 | num_sectors = rdev->sb_start; | |
0f420358 | 1364 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1365 | rdev->sb_page); |
1366 | md_super_wait(rdev->mddev); | |
c26a44ed | 1367 | return num_sectors; |
0cd17fec CW |
1368 | } |
1369 | ||
1370 | ||
1da177e4 LT |
1371 | /* |
1372 | * version 1 superblock | |
1373 | */ | |
1374 | ||
1c05b4bc | 1375 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1376 | { |
1c05b4bc N |
1377 | __le32 disk_csum; |
1378 | u32 csum; | |
1da177e4 LT |
1379 | unsigned long long newcsum; |
1380 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1381 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1382 | int i; |
1383 | ||
1384 | disk_csum = sb->sb_csum; | |
1385 | sb->sb_csum = 0; | |
1386 | newcsum = 0; | |
1387 | for (i=0; size>=4; size -= 4 ) | |
1388 | newcsum += le32_to_cpu(*isuper++); | |
1389 | ||
1390 | if (size == 2) | |
1c05b4bc | 1391 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1392 | |
1393 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1394 | sb->sb_csum = disk_csum; | |
1395 | return cpu_to_le32(csum); | |
1396 | } | |
1397 | ||
1398 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1399 | { | |
1400 | struct mdp_superblock_1 *sb; | |
1401 | int ret; | |
0f420358 | 1402 | sector_t sb_start; |
1da177e4 | 1403 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1404 | int bmask; |
1da177e4 LT |
1405 | |
1406 | /* | |
0f420358 | 1407 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1408 | * It is always aligned to a 4K boundary and |
1409 | * depeding on minor_version, it can be: | |
1410 | * 0: At least 8K, but less than 12K, from end of device | |
1411 | * 1: At start of device | |
1412 | * 2: 4K from start of device. | |
1413 | */ | |
1414 | switch(minor_version) { | |
1415 | case 0: | |
77304d2a | 1416 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1417 | sb_start -= 8*2; |
1418 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1419 | break; |
1420 | case 1: | |
0f420358 | 1421 | sb_start = 0; |
1da177e4 LT |
1422 | break; |
1423 | case 2: | |
0f420358 | 1424 | sb_start = 8; |
1da177e4 LT |
1425 | break; |
1426 | default: | |
1427 | return -EINVAL; | |
1428 | } | |
0f420358 | 1429 | rdev->sb_start = sb_start; |
1da177e4 | 1430 | |
0002b271 N |
1431 | /* superblock is rarely larger than 1K, but it can be larger, |
1432 | * and it is safe to read 4k, so we do that | |
1433 | */ | |
1434 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1435 | if (ret) return ret; |
1436 | ||
1437 | ||
65a06f06 | 1438 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1439 | |
1440 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1441 | sb->major_version != cpu_to_le32(1) || | |
1442 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1443 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1444 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1445 | return -EINVAL; |
1446 | ||
1447 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1448 | printk("md: invalid superblock checksum on %s\n", | |
1449 | bdevname(rdev->bdev,b)); | |
1450 | return -EINVAL; | |
1451 | } | |
1452 | if (le64_to_cpu(sb->data_size) < 10) { | |
1453 | printk("md: data_size too small on %s\n", | |
1454 | bdevname(rdev->bdev,b)); | |
1455 | return -EINVAL; | |
1456 | } | |
e11e93fa | 1457 | |
1da177e4 LT |
1458 | rdev->preferred_minor = 0xffff; |
1459 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1460 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1461 | |
0002b271 | 1462 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1463 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1464 | if (rdev->sb_size & bmask) |
a1801f85 N |
1465 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1466 | ||
1467 | if (minor_version | |
0f420358 | 1468 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1469 | return -EINVAL; |
0002b271 | 1470 | |
31b65a0d N |
1471 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1472 | rdev->desc_nr = -1; | |
1473 | else | |
1474 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1475 | ||
9a7b2b0f | 1476 | if (!refdev) { |
8ed75463 | 1477 | ret = 1; |
9a7b2b0f | 1478 | } else { |
1da177e4 | 1479 | __u64 ev1, ev2; |
65a06f06 | 1480 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1481 | |
1482 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1483 | sb->level != refsb->level || | |
1484 | sb->layout != refsb->layout || | |
1485 | sb->chunksize != refsb->chunksize) { | |
1486 | printk(KERN_WARNING "md: %s has strangely different" | |
1487 | " superblock to %s\n", | |
1488 | bdevname(rdev->bdev,b), | |
1489 | bdevname(refdev->bdev,b2)); | |
1490 | return -EINVAL; | |
1491 | } | |
1492 | ev1 = le64_to_cpu(sb->events); | |
1493 | ev2 = le64_to_cpu(refsb->events); | |
1494 | ||
1495 | if (ev1 > ev2) | |
8ed75463 N |
1496 | ret = 1; |
1497 | else | |
1498 | ret = 0; | |
1da177e4 | 1499 | } |
a1801f85 | 1500 | if (minor_version) |
77304d2a | 1501 | rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 1502 | le64_to_cpu(sb->data_offset); |
1da177e4 | 1503 | else |
dd8ac336 AN |
1504 | rdev->sectors = rdev->sb_start; |
1505 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1506 | return -EINVAL; |
dd8ac336 | 1507 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1508 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1509 | return -EINVAL; |
8ed75463 | 1510 | return ret; |
1da177e4 LT |
1511 | } |
1512 | ||
1513 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1514 | { | |
65a06f06 | 1515 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1516 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1517 | |
41158c7e | 1518 | rdev->raid_disk = -1; |
c5d79adb N |
1519 | clear_bit(Faulty, &rdev->flags); |
1520 | clear_bit(In_sync, &rdev->flags); | |
1521 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1522 | |
1da177e4 LT |
1523 | if (mddev->raid_disks == 0) { |
1524 | mddev->major_version = 1; | |
1525 | mddev->patch_version = 0; | |
e691063a | 1526 | mddev->external = 0; |
9d8f0363 | 1527 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1528 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1529 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1530 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1531 | mddev->clevel[0] = 0; |
1da177e4 LT |
1532 | mddev->layout = le32_to_cpu(sb->layout); |
1533 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1534 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1535 | mddev->events = ev1; |
c3d9714e N |
1536 | mddev->bitmap_info.offset = 0; |
1537 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1538 | |
1539 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1540 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1541 | ||
1542 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1543 | |
71c0805c | 1544 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1545 | mddev->bitmap_info.file == NULL ) |
1546 | mddev->bitmap_info.offset = | |
1547 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1548 | |
f6705578 N |
1549 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1550 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1551 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1552 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1553 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1554 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1555 | } else { |
1556 | mddev->reshape_position = MaxSector; | |
1557 | mddev->delta_disks = 0; | |
1558 | mddev->new_level = mddev->level; | |
1559 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1560 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1561 | } |
1562 | ||
41158c7e | 1563 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1564 | /* Insist of good event counter while assembling, except for |
1565 | * spares (which don't need an event count) */ | |
1da177e4 | 1566 | ++ev1; |
be6800a7 N |
1567 | if (rdev->desc_nr >= 0 && |
1568 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1569 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1570 | if (ev1 < mddev->events) | |
1571 | return -EINVAL; | |
41158c7e N |
1572 | } else if (mddev->bitmap) { |
1573 | /* If adding to array with a bitmap, then we can accept an | |
1574 | * older device, but not too old. | |
1575 | */ | |
41158c7e N |
1576 | if (ev1 < mddev->bitmap->events_cleared) |
1577 | return 0; | |
07d84d10 N |
1578 | } else { |
1579 | if (ev1 < mddev->events) | |
1580 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1581 | return 0; | |
1582 | } | |
1da177e4 LT |
1583 | if (mddev->level != LEVEL_MULTIPATH) { |
1584 | int role; | |
3673f305 N |
1585 | if (rdev->desc_nr < 0 || |
1586 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1587 | role = 0xffff; | |
1588 | rdev->desc_nr = -1; | |
1589 | } else | |
1590 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1591 | switch(role) { |
1592 | case 0xffff: /* spare */ | |
1da177e4 LT |
1593 | break; |
1594 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1595 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1596 | break; |
1597 | default: | |
5fd6c1dc N |
1598 | if ((le32_to_cpu(sb->feature_map) & |
1599 | MD_FEATURE_RECOVERY_OFFSET)) | |
1600 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1601 | else | |
1602 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1603 | rdev->raid_disk = role; |
1604 | break; | |
1605 | } | |
8ddf9efe N |
1606 | if (sb->devflags & WriteMostly1) |
1607 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1608 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1609 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1610 | |
1da177e4 LT |
1611 | return 0; |
1612 | } | |
1613 | ||
1614 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1615 | { | |
1616 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1617 | mdk_rdev_t *rdev2; |
1618 | int max_dev, i; | |
1619 | /* make rdev->sb match mddev and rdev data. */ | |
1620 | ||
65a06f06 | 1621 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1622 | |
1623 | sb->feature_map = 0; | |
1624 | sb->pad0 = 0; | |
5fd6c1dc | 1625 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1626 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1627 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1628 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1629 | ||
1630 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1631 | sb->events = cpu_to_le64(mddev->events); | |
1632 | if (mddev->in_sync) | |
1633 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1634 | else | |
1635 | sb->resync_offset = cpu_to_le64(0); | |
1636 | ||
1c05b4bc | 1637 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1638 | |
f0ca340c | 1639 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1640 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1641 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1642 | sb->level = cpu_to_le32(mddev->level); |
1643 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1644 | |
c3d9714e N |
1645 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1646 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1647 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1648 | } |
5fd6c1dc N |
1649 | |
1650 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1651 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1652 | sb->feature_map |= |
1653 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1654 | sb->recovery_offset = | |
1655 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1656 | } |
1657 | ||
f6705578 N |
1658 | if (mddev->reshape_position != MaxSector) { |
1659 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1660 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1661 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1662 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1663 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1664 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1665 | } |
a654b9d8 | 1666 | |
1da177e4 | 1667 | max_dev = 0; |
159ec1fc | 1668 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1669 | if (rdev2->desc_nr+1 > max_dev) |
1670 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1671 | |
70471daf N |
1672 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1673 | int bmask; | |
a778b73f | 1674 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1675 | rdev->sb_size = max_dev * 2 + 256; |
1676 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1677 | if (rdev->sb_size & bmask) | |
1678 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1679 | } else |
1680 | max_dev = le32_to_cpu(sb->max_dev); | |
1681 | ||
1da177e4 LT |
1682 | for (i=0; i<max_dev;i++) |
1683 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1684 | ||
159ec1fc | 1685 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1686 | i = rdev2->desc_nr; |
b2d444d7 | 1687 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1688 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1689 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1690 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1691 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1692 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1693 | else |
1694 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1695 | } | |
1696 | ||
1da177e4 LT |
1697 | sb->sb_csum = calc_sb_1_csum(sb); |
1698 | } | |
1699 | ||
0cd17fec | 1700 | static unsigned long long |
15f4a5fd | 1701 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1702 | { |
1703 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1704 | sector_t max_sectors; |
58c0fed4 | 1705 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1706 | return 0; /* component must fit device */ |
0f420358 | 1707 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1708 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1709 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1710 | max_sectors -= rdev->data_offset; |
1711 | if (!num_sectors || num_sectors > max_sectors) | |
1712 | num_sectors = max_sectors; | |
c3d9714e | 1713 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1714 | /* minor version 0 with bitmap we can't move */ |
1715 | return 0; | |
1716 | } else { | |
1717 | /* minor version 0; superblock after data */ | |
0f420358 | 1718 | sector_t sb_start; |
77304d2a | 1719 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1720 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1721 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1722 | if (!num_sectors || num_sectors > max_sectors) |
1723 | num_sectors = max_sectors; | |
0f420358 | 1724 | rdev->sb_start = sb_start; |
0cd17fec | 1725 | } |
65a06f06 | 1726 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1727 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1728 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1729 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1730 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1731 | rdev->sb_page); |
1732 | md_super_wait(rdev->mddev); | |
c26a44ed | 1733 | return num_sectors; |
0cd17fec | 1734 | } |
1da177e4 | 1735 | |
75c96f85 | 1736 | static struct super_type super_types[] = { |
1da177e4 LT |
1737 | [0] = { |
1738 | .name = "0.90.0", | |
1739 | .owner = THIS_MODULE, | |
0cd17fec CW |
1740 | .load_super = super_90_load, |
1741 | .validate_super = super_90_validate, | |
1742 | .sync_super = super_90_sync, | |
1743 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1744 | }, |
1745 | [1] = { | |
1746 | .name = "md-1", | |
1747 | .owner = THIS_MODULE, | |
0cd17fec CW |
1748 | .load_super = super_1_load, |
1749 | .validate_super = super_1_validate, | |
1750 | .sync_super = super_1_sync, | |
1751 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1752 | }, |
1753 | }; | |
1da177e4 | 1754 | |
076f968b JB |
1755 | static void sync_super(mddev_t *mddev, mdk_rdev_t *rdev) |
1756 | { | |
1757 | if (mddev->sync_super) { | |
1758 | mddev->sync_super(mddev, rdev); | |
1759 | return; | |
1760 | } | |
1761 | ||
1762 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1763 | ||
1764 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1765 | } | |
1766 | ||
1da177e4 LT |
1767 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) |
1768 | { | |
7dd5e7c3 | 1769 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1770 | |
4b80991c N |
1771 | rcu_read_lock(); |
1772 | rdev_for_each_rcu(rdev, mddev1) | |
1773 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1774 | if (rdev->bdev->bd_contains == |
4b80991c N |
1775 | rdev2->bdev->bd_contains) { |
1776 | rcu_read_unlock(); | |
7dd5e7c3 | 1777 | return 1; |
4b80991c N |
1778 | } |
1779 | rcu_read_unlock(); | |
1da177e4 LT |
1780 | return 0; |
1781 | } | |
1782 | ||
1783 | static LIST_HEAD(pending_raid_disks); | |
1784 | ||
ac5e7113 AN |
1785 | /* |
1786 | * Try to register data integrity profile for an mddev | |
1787 | * | |
1788 | * This is called when an array is started and after a disk has been kicked | |
1789 | * from the array. It only succeeds if all working and active component devices | |
1790 | * are integrity capable with matching profiles. | |
1791 | */ | |
1792 | int md_integrity_register(mddev_t *mddev) | |
1793 | { | |
1794 | mdk_rdev_t *rdev, *reference = NULL; | |
1795 | ||
1796 | if (list_empty(&mddev->disks)) | |
1797 | return 0; /* nothing to do */ | |
629acb6a JB |
1798 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1799 | return 0; /* shouldn't register, or already is */ | |
ac5e7113 AN |
1800 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1801 | /* skip spares and non-functional disks */ | |
1802 | if (test_bit(Faulty, &rdev->flags)) | |
1803 | continue; | |
1804 | if (rdev->raid_disk < 0) | |
1805 | continue; | |
ac5e7113 AN |
1806 | if (!reference) { |
1807 | /* Use the first rdev as the reference */ | |
1808 | reference = rdev; | |
1809 | continue; | |
1810 | } | |
1811 | /* does this rdev's profile match the reference profile? */ | |
1812 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1813 | rdev->bdev->bd_disk) < 0) | |
1814 | return -EINVAL; | |
1815 | } | |
89078d57 MP |
1816 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1817 | return 0; | |
ac5e7113 AN |
1818 | /* |
1819 | * All component devices are integrity capable and have matching | |
1820 | * profiles, register the common profile for the md device. | |
1821 | */ | |
1822 | if (blk_integrity_register(mddev->gendisk, | |
1823 | bdev_get_integrity(reference->bdev)) != 0) { | |
1824 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1825 | mdname(mddev)); | |
1826 | return -EINVAL; | |
1827 | } | |
a91a2785 MP |
1828 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
1829 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
1830 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
1831 | mdname(mddev)); | |
1832 | return -EINVAL; | |
1833 | } | |
ac5e7113 AN |
1834 | return 0; |
1835 | } | |
1836 | EXPORT_SYMBOL(md_integrity_register); | |
1837 | ||
1838 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1839 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1840 | { |
3f9d99c1 | 1841 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1842 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1843 | |
ac5e7113 | 1844 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1845 | return; |
ac5e7113 | 1846 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1847 | return; |
ac5e7113 AN |
1848 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1849 | rdev->bdev->bd_disk) >= 0) | |
1850 | return; | |
1851 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1852 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1853 | } |
ac5e7113 | 1854 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1855 | |
1da177e4 LT |
1856 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1857 | { | |
7dd5e7c3 | 1858 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1859 | struct kobject *ko; |
1edf80d3 | 1860 | char *s; |
5e55e2f5 | 1861 | int err; |
1da177e4 LT |
1862 | |
1863 | if (rdev->mddev) { | |
1864 | MD_BUG(); | |
1865 | return -EINVAL; | |
1866 | } | |
11e2ede0 DW |
1867 | |
1868 | /* prevent duplicates */ | |
1869 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1870 | return -EEXIST; | |
1871 | ||
dd8ac336 AN |
1872 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1873 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1874 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1875 | if (mddev->pers) { |
1876 | /* Cannot change size, so fail | |
1877 | * If mddev->level <= 0, then we don't care | |
1878 | * about aligning sizes (e.g. linear) | |
1879 | */ | |
1880 | if (mddev->level > 0) | |
1881 | return -ENOSPC; | |
1882 | } else | |
dd8ac336 | 1883 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1884 | } |
1da177e4 LT |
1885 | |
1886 | /* Verify rdev->desc_nr is unique. | |
1887 | * If it is -1, assign a free number, else | |
1888 | * check number is not in use | |
1889 | */ | |
1890 | if (rdev->desc_nr < 0) { | |
1891 | int choice = 0; | |
1892 | if (mddev->pers) choice = mddev->raid_disks; | |
1893 | while (find_rdev_nr(mddev, choice)) | |
1894 | choice++; | |
1895 | rdev->desc_nr = choice; | |
1896 | } else { | |
1897 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1898 | return -EBUSY; | |
1899 | } | |
de01dfad N |
1900 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1901 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1902 | mdname(mddev), mddev->max_disks); | |
1903 | return -EBUSY; | |
1904 | } | |
19133a42 | 1905 | bdevname(rdev->bdev,b); |
649316b2 | 1906 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1907 | *s = '!'; |
649316b2 | 1908 | |
1da177e4 | 1909 | rdev->mddev = mddev; |
19133a42 | 1910 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1911 | |
b2d6db58 | 1912 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1913 | goto fail; |
86e6ffdd | 1914 | |
0762b8bd | 1915 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
1916 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
1917 | /* failure here is OK */; | |
1918 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 1919 | |
4b80991c | 1920 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 1921 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
1922 | |
1923 | /* May as well allow recovery to be retried once */ | |
5389042f | 1924 | mddev->recovery_disabled++; |
3f9d99c1 | 1925 | |
1da177e4 | 1926 | return 0; |
5e55e2f5 N |
1927 | |
1928 | fail: | |
1929 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1930 | b, mdname(mddev)); | |
1931 | return err; | |
1da177e4 LT |
1932 | } |
1933 | ||
177a99b2 | 1934 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1935 | { |
1936 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1937 | kobject_del(&rdev->kobj); | |
177a99b2 | 1938 | kobject_put(&rdev->kobj); |
5792a285 N |
1939 | } |
1940 | ||
1da177e4 LT |
1941 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1942 | { | |
1943 | char b[BDEVNAME_SIZE]; | |
1944 | if (!rdev->mddev) { | |
1945 | MD_BUG(); | |
1946 | return; | |
1947 | } | |
49731baa | 1948 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1949 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1950 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1951 | rdev->mddev = NULL; | |
86e6ffdd | 1952 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1953 | sysfs_put(rdev->sysfs_state); |
1954 | rdev->sysfs_state = NULL; | |
2230dfe4 N |
1955 | kfree(rdev->badblocks.page); |
1956 | rdev->badblocks.count = 0; | |
1957 | rdev->badblocks.page = NULL; | |
5792a285 | 1958 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1959 | * writing to 'remove' to "dev/state". We also need |
1960 | * to delay it due to rcu usage. | |
5792a285 | 1961 | */ |
4b80991c | 1962 | synchronize_rcu(); |
177a99b2 N |
1963 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1964 | kobject_get(&rdev->kobj); | |
e804ac78 | 1965 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
1966 | } |
1967 | ||
1968 | /* | |
1969 | * prevent the device from being mounted, repartitioned or | |
1970 | * otherwise reused by a RAID array (or any other kernel | |
1971 | * subsystem), by bd_claiming the device. | |
1972 | */ | |
c5d79adb | 1973 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1974 | { |
1975 | int err = 0; | |
1976 | struct block_device *bdev; | |
1977 | char b[BDEVNAME_SIZE]; | |
1978 | ||
d4d77629 TH |
1979 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
1980 | shared ? (mdk_rdev_t *)lock_rdev : rdev); | |
1da177e4 LT |
1981 | if (IS_ERR(bdev)) { |
1982 | printk(KERN_ERR "md: could not open %s.\n", | |
1983 | __bdevname(dev, b)); | |
1984 | return PTR_ERR(bdev); | |
1985 | } | |
1da177e4 LT |
1986 | rdev->bdev = bdev; |
1987 | return err; | |
1988 | } | |
1989 | ||
1990 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1991 | { | |
1992 | struct block_device *bdev = rdev->bdev; | |
1993 | rdev->bdev = NULL; | |
1994 | if (!bdev) | |
1995 | MD_BUG(); | |
e525fd89 | 1996 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
1997 | } |
1998 | ||
1999 | void md_autodetect_dev(dev_t dev); | |
2000 | ||
2001 | static void export_rdev(mdk_rdev_t * rdev) | |
2002 | { | |
2003 | char b[BDEVNAME_SIZE]; | |
2004 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
2005 | bdevname(rdev->bdev,b)); | |
2006 | if (rdev->mddev) | |
2007 | MD_BUG(); | |
2008 | free_disk_sb(rdev); | |
1da177e4 | 2009 | #ifndef MODULE |
d0fae18f N |
2010 | if (test_bit(AutoDetected, &rdev->flags)) |
2011 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2012 | #endif |
2013 | unlock_rdev(rdev); | |
86e6ffdd | 2014 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2015 | } |
2016 | ||
2017 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
2018 | { | |
2019 | unbind_rdev_from_array(rdev); | |
2020 | export_rdev(rdev); | |
2021 | } | |
2022 | ||
2023 | static void export_array(mddev_t *mddev) | |
2024 | { | |
159ec1fc | 2025 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 2026 | |
d089c6af | 2027 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2028 | if (!rdev->mddev) { |
2029 | MD_BUG(); | |
2030 | continue; | |
2031 | } | |
2032 | kick_rdev_from_array(rdev); | |
2033 | } | |
2034 | if (!list_empty(&mddev->disks)) | |
2035 | MD_BUG(); | |
2036 | mddev->raid_disks = 0; | |
2037 | mddev->major_version = 0; | |
2038 | } | |
2039 | ||
2040 | static void print_desc(mdp_disk_t *desc) | |
2041 | { | |
2042 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2043 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2044 | } | |
2045 | ||
cd2ac932 | 2046 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2047 | { |
2048 | int i; | |
2049 | ||
2050 | printk(KERN_INFO | |
2051 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2052 | sb->major_version, sb->minor_version, sb->patch_version, | |
2053 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2054 | sb->ctime); | |
2055 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2056 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2057 | sb->md_minor, sb->layout, sb->chunk_size); | |
2058 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2059 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2060 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2061 | sb->failed_disks, sb->spare_disks, | |
2062 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2063 | ||
2064 | printk(KERN_INFO); | |
2065 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2066 | mdp_disk_t *desc; | |
2067 | ||
2068 | desc = sb->disks + i; | |
2069 | if (desc->number || desc->major || desc->minor || | |
2070 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2071 | printk(" D %2d: ", i); | |
2072 | print_desc(desc); | |
2073 | } | |
2074 | } | |
2075 | printk(KERN_INFO "md: THIS: "); | |
2076 | print_desc(&sb->this_disk); | |
cd2ac932 | 2077 | } |
1da177e4 | 2078 | |
cd2ac932 CR |
2079 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2080 | { | |
2081 | __u8 *uuid; | |
2082 | ||
2083 | uuid = sb->set_uuid; | |
ad361c98 | 2084 | printk(KERN_INFO |
7b75c2f8 | 2085 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2086 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2087 | le32_to_cpu(sb->major_version), |
2088 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2089 | uuid, |
cd2ac932 CR |
2090 | sb->set_name, |
2091 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2092 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2093 | ||
2094 | uuid = sb->device_uuid; | |
ad361c98 JP |
2095 | printk(KERN_INFO |
2096 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2097 | " RO:%llu\n" |
7b75c2f8 | 2098 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2099 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2100 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2101 | le32_to_cpu(sb->level), |
2102 | (unsigned long long)le64_to_cpu(sb->size), | |
2103 | le32_to_cpu(sb->raid_disks), | |
2104 | le32_to_cpu(sb->layout), | |
2105 | le32_to_cpu(sb->chunksize), | |
2106 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2107 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2108 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2109 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2110 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2111 | uuid, |
cd2ac932 CR |
2112 | sb->devflags, |
2113 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2114 | (unsigned long long)le64_to_cpu(sb->events), | |
2115 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2116 | le32_to_cpu(sb->sb_csum), | |
2117 | le32_to_cpu(sb->max_dev) | |
2118 | ); | |
1da177e4 LT |
2119 | } |
2120 | ||
cd2ac932 | 2121 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
2122 | { |
2123 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2124 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2125 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2126 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2127 | rdev->desc_nr); | |
1da177e4 | 2128 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2129 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2130 | switch (major_version) { | |
2131 | case 0: | |
65a06f06 | 2132 | print_sb_90(page_address(rdev->sb_page)); |
cd2ac932 CR |
2133 | break; |
2134 | case 1: | |
65a06f06 | 2135 | print_sb_1(page_address(rdev->sb_page)); |
cd2ac932 CR |
2136 | break; |
2137 | } | |
1da177e4 LT |
2138 | } else |
2139 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2140 | } | |
2141 | ||
5e56341d | 2142 | static void md_print_devices(void) |
1da177e4 | 2143 | { |
159ec1fc | 2144 | struct list_head *tmp; |
1da177e4 LT |
2145 | mdk_rdev_t *rdev; |
2146 | mddev_t *mddev; | |
2147 | char b[BDEVNAME_SIZE]; | |
2148 | ||
2149 | printk("\n"); | |
2150 | printk("md: **********************************\n"); | |
2151 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2152 | printk("md: **********************************\n"); | |
29ac4aa3 | 2153 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2154 | |
32a7627c N |
2155 | if (mddev->bitmap) |
2156 | bitmap_print_sb(mddev->bitmap); | |
2157 | else | |
2158 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2159 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2160 | printk("<%s>", bdevname(rdev->bdev,b)); |
2161 | printk("\n"); | |
2162 | ||
159ec1fc | 2163 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2164 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2165 | } |
2166 | printk("md: **********************************\n"); | |
2167 | printk("\n"); | |
2168 | } | |
2169 | ||
2170 | ||
42543769 | 2171 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2172 | { |
42543769 N |
2173 | /* Update each superblock (in-memory image), but |
2174 | * if we are allowed to, skip spares which already | |
2175 | * have the right event counter, or have one earlier | |
2176 | * (which would mean they aren't being marked as dirty | |
2177 | * with the rest of the array) | |
2178 | */ | |
1da177e4 | 2179 | mdk_rdev_t *rdev; |
159ec1fc | 2180 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2181 | if (rdev->sb_events == mddev->events || |
2182 | (nospares && | |
2183 | rdev->raid_disk < 0 && | |
42543769 N |
2184 | rdev->sb_events+1 == mddev->events)) { |
2185 | /* Don't update this superblock */ | |
2186 | rdev->sb_loaded = 2; | |
2187 | } else { | |
076f968b | 2188 | sync_super(mddev, rdev); |
42543769 N |
2189 | rdev->sb_loaded = 1; |
2190 | } | |
1da177e4 LT |
2191 | } |
2192 | } | |
2193 | ||
850b2b42 | 2194 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2195 | { |
1da177e4 | 2196 | mdk_rdev_t *rdev; |
06d91a5f | 2197 | int sync_req; |
42543769 | 2198 | int nospares = 0; |
1da177e4 | 2199 | |
1da177e4 | 2200 | repeat: |
3a3a5ddb N |
2201 | /* First make sure individual recovery_offsets are correct */ |
2202 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2203 | if (rdev->raid_disk >= 0 && | |
2204 | mddev->delta_disks >= 0 && | |
2205 | !test_bit(In_sync, &rdev->flags) && | |
2206 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2207 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2208 | ||
2209 | } | |
bd52b746 | 2210 | if (!mddev->persistent) { |
070dc6dd | 2211 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2212 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
d97a41dc N |
2213 | if (!mddev->external) |
2214 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3a3a5ddb N |
2215 | wake_up(&mddev->sb_wait); |
2216 | return; | |
2217 | } | |
2218 | ||
a9701a30 | 2219 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2220 | |
3a3a5ddb N |
2221 | mddev->utime = get_seconds(); |
2222 | ||
850b2b42 N |
2223 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2224 | force_change = 1; | |
2225 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2226 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2227 | * though if events isn't the right even/odd, we will have to do | |
2228 | * spares after all | |
2229 | */ | |
2230 | nospares = 1; | |
2231 | if (force_change) | |
2232 | nospares = 0; | |
2233 | if (mddev->degraded) | |
84692195 N |
2234 | /* If the array is degraded, then skipping spares is both |
2235 | * dangerous and fairly pointless. | |
2236 | * Dangerous because a device that was removed from the array | |
2237 | * might have a event_count that still looks up-to-date, | |
2238 | * so it can be re-added without a resync. | |
2239 | * Pointless because if there are any spares to skip, | |
2240 | * then a recovery will happen and soon that array won't | |
2241 | * be degraded any more and the spare can go back to sleep then. | |
2242 | */ | |
850b2b42 | 2243 | nospares = 0; |
84692195 | 2244 | |
06d91a5f | 2245 | sync_req = mddev->in_sync; |
42543769 N |
2246 | |
2247 | /* If this is just a dirty<->clean transition, and the array is clean | |
2248 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2249 | if (nospares |
42543769 | 2250 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2251 | && mddev->can_decrease_events |
2252 | && mddev->events != 1) { | |
42543769 | 2253 | mddev->events--; |
a8707c08 N |
2254 | mddev->can_decrease_events = 0; |
2255 | } else { | |
42543769 N |
2256 | /* otherwise we have to go forward and ... */ |
2257 | mddev->events ++; | |
a8707c08 | 2258 | mddev->can_decrease_events = nospares; |
42543769 | 2259 | } |
1da177e4 LT |
2260 | |
2261 | if (!mddev->events) { | |
2262 | /* | |
2263 | * oops, this 64-bit counter should never wrap. | |
2264 | * Either we are in around ~1 trillion A.C., assuming | |
2265 | * 1 reboot per second, or we have a bug: | |
2266 | */ | |
2267 | MD_BUG(); | |
2268 | mddev->events --; | |
2269 | } | |
e691063a | 2270 | sync_sbs(mddev, nospares); |
a9701a30 | 2271 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2272 | |
2273 | dprintk(KERN_INFO | |
2274 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2275 | mdname(mddev),mddev->in_sync); | |
2276 | ||
4ad13663 | 2277 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2278 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2279 | char b[BDEVNAME_SIZE]; |
2280 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2281 | if (rdev->sb_loaded != 1) |
2282 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2283 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2284 | dprintk("(skipping faulty "); |
2285 | ||
2286 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2287 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2288 | md_super_write(mddev,rdev, |
0f420358 | 2289 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2290 | rdev->sb_page); |
2291 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2292 | bdevname(rdev->bdev,b), | |
0f420358 | 2293 | (unsigned long long)rdev->sb_start); |
42543769 | 2294 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2295 | |
1da177e4 LT |
2296 | } else |
2297 | dprintk(")\n"); | |
7bfa19f2 | 2298 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2299 | /* only need to write one superblock... */ |
2300 | break; | |
2301 | } | |
a9701a30 | 2302 | md_super_wait(mddev); |
850b2b42 | 2303 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2304 | |
a9701a30 | 2305 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2306 | if (mddev->in_sync != sync_req || |
2307 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2308 | /* have to write it out again */ |
a9701a30 | 2309 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2310 | goto repeat; |
2311 | } | |
850b2b42 | 2312 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2313 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2314 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2315 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2316 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2317 | |
1da177e4 LT |
2318 | } |
2319 | ||
7f6ce769 | 2320 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2321 | * We want to accept with case. For this we use cmd_match. |
2322 | */ | |
2323 | static int cmd_match(const char *cmd, const char *str) | |
2324 | { | |
2325 | /* See if cmd, written into a sysfs file, matches | |
2326 | * str. They must either be the same, or cmd can | |
2327 | * have a trailing newline | |
2328 | */ | |
2329 | while (*cmd && *str && *cmd == *str) { | |
2330 | cmd++; | |
2331 | str++; | |
2332 | } | |
2333 | if (*cmd == '\n') | |
2334 | cmd++; | |
2335 | if (*str || *cmd) | |
2336 | return 0; | |
2337 | return 1; | |
2338 | } | |
2339 | ||
86e6ffdd N |
2340 | struct rdev_sysfs_entry { |
2341 | struct attribute attr; | |
2342 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2343 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2344 | }; | |
2345 | ||
2346 | static ssize_t | |
96de1e66 | 2347 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2348 | { |
2349 | char *sep = ""; | |
20a49ff6 | 2350 | size_t len = 0; |
86e6ffdd | 2351 | |
b2d444d7 | 2352 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2353 | len+= sprintf(page+len, "%sfaulty",sep); |
2354 | sep = ","; | |
2355 | } | |
b2d444d7 | 2356 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2357 | len += sprintf(page+len, "%sin_sync",sep); |
2358 | sep = ","; | |
2359 | } | |
f655675b N |
2360 | if (test_bit(WriteMostly, &rdev->flags)) { |
2361 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2362 | sep = ","; | |
2363 | } | |
6bfe0b49 DW |
2364 | if (test_bit(Blocked, &rdev->flags)) { |
2365 | len += sprintf(page+len, "%sblocked", sep); | |
2366 | sep = ","; | |
2367 | } | |
b2d444d7 N |
2368 | if (!test_bit(Faulty, &rdev->flags) && |
2369 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2370 | len += sprintf(page+len, "%sspare", sep); |
2371 | sep = ","; | |
2372 | } | |
2373 | return len+sprintf(page+len, "\n"); | |
2374 | } | |
2375 | ||
45dc2de1 N |
2376 | static ssize_t |
2377 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2378 | { | |
2379 | /* can write | |
2380 | * faulty - simulates and error | |
2381 | * remove - disconnects the device | |
f655675b N |
2382 | * writemostly - sets write_mostly |
2383 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2384 | * blocked - sets the Blocked flag |
2385 | * -blocked - clears the Blocked flag | |
6d56e278 | 2386 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2387 | */ |
2388 | int err = -EINVAL; | |
2389 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2390 | md_error(rdev->mddev, rdev); | |
2391 | err = 0; | |
2392 | } else if (cmd_match(buf, "remove")) { | |
2393 | if (rdev->raid_disk >= 0) | |
2394 | err = -EBUSY; | |
2395 | else { | |
2396 | mddev_t *mddev = rdev->mddev; | |
2397 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2398 | if (mddev->pers) |
2399 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2400 | md_new_event(mddev); |
2401 | err = 0; | |
2402 | } | |
f655675b N |
2403 | } else if (cmd_match(buf, "writemostly")) { |
2404 | set_bit(WriteMostly, &rdev->flags); | |
2405 | err = 0; | |
2406 | } else if (cmd_match(buf, "-writemostly")) { | |
2407 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2408 | err = 0; |
2409 | } else if (cmd_match(buf, "blocked")) { | |
2410 | set_bit(Blocked, &rdev->flags); | |
2411 | err = 0; | |
2412 | } else if (cmd_match(buf, "-blocked")) { | |
2413 | clear_bit(Blocked, &rdev->flags); | |
2414 | wake_up(&rdev->blocked_wait); | |
2415 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2416 | md_wakeup_thread(rdev->mddev->thread); | |
2417 | ||
6d56e278 N |
2418 | err = 0; |
2419 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2420 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2421 | err = 0; |
45dc2de1 | 2422 | } |
00bcb4ac N |
2423 | if (!err) |
2424 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2425 | return err ? err : len; |
2426 | } | |
80ca3a44 N |
2427 | static struct rdev_sysfs_entry rdev_state = |
2428 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2429 | |
4dbcdc75 N |
2430 | static ssize_t |
2431 | errors_show(mdk_rdev_t *rdev, char *page) | |
2432 | { | |
2433 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2434 | } | |
2435 | ||
2436 | static ssize_t | |
2437 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2438 | { | |
2439 | char *e; | |
2440 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2441 | if (*buf && (*e == 0 || *e == '\n')) { | |
2442 | atomic_set(&rdev->corrected_errors, n); | |
2443 | return len; | |
2444 | } | |
2445 | return -EINVAL; | |
2446 | } | |
2447 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2448 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2449 | |
014236d2 N |
2450 | static ssize_t |
2451 | slot_show(mdk_rdev_t *rdev, char *page) | |
2452 | { | |
2453 | if (rdev->raid_disk < 0) | |
2454 | return sprintf(page, "none\n"); | |
2455 | else | |
2456 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2457 | } | |
2458 | ||
2459 | static ssize_t | |
2460 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2461 | { | |
2462 | char *e; | |
c303da6d | 2463 | int err; |
014236d2 N |
2464 | int slot = simple_strtoul(buf, &e, 10); |
2465 | if (strncmp(buf, "none", 4)==0) | |
2466 | slot = -1; | |
2467 | else if (e==buf || (*e && *e!= '\n')) | |
2468 | return -EINVAL; | |
6c2fce2e | 2469 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2470 | /* Setting 'slot' on an active array requires also |
2471 | * updating the 'rd%d' link, and communicating | |
2472 | * with the personality with ->hot_*_disk. | |
2473 | * For now we only support removing | |
2474 | * failed/spare devices. This normally happens automatically, | |
2475 | * but not when the metadata is externally managed. | |
2476 | */ | |
c303da6d N |
2477 | if (rdev->raid_disk == -1) |
2478 | return -EEXIST; | |
2479 | /* personality does all needed checks */ | |
01393f3d | 2480 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d N |
2481 | return -EINVAL; |
2482 | err = rdev->mddev->pers-> | |
2483 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2484 | if (err) | |
2485 | return err; | |
36fad858 | 2486 | sysfs_unlink_rdev(rdev->mddev, rdev); |
b7103107 | 2487 | rdev->raid_disk = -1; |
c303da6d N |
2488 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2489 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2490 | } else if (rdev->mddev->pers) { |
2491 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2492 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2493 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2494 | */ |
2495 | ||
2496 | if (rdev->raid_disk != -1) | |
2497 | return -EBUSY; | |
2498 | ||
c6751b2b N |
2499 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2500 | return -EBUSY; | |
2501 | ||
6c2fce2e NB |
2502 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2503 | return -EINVAL; | |
2504 | ||
159ec1fc | 2505 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2506 | if (rdev2->raid_disk == slot) |
2507 | return -EEXIST; | |
2508 | ||
ba1b41b6 N |
2509 | if (slot >= rdev->mddev->raid_disks && |
2510 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2511 | return -ENOSPC; | |
2512 | ||
6c2fce2e NB |
2513 | rdev->raid_disk = slot; |
2514 | if (test_bit(In_sync, &rdev->flags)) | |
2515 | rdev->saved_raid_disk = slot; | |
2516 | else | |
2517 | rdev->saved_raid_disk = -1; | |
2518 | err = rdev->mddev->pers-> | |
2519 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2520 | if (err) { |
6c2fce2e | 2521 | rdev->raid_disk = -1; |
6c2fce2e | 2522 | return err; |
52664732 | 2523 | } else |
00bcb4ac | 2524 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2525 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2526 | /* failure here is OK */; |
6c2fce2e | 2527 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2528 | } else { |
ba1b41b6 N |
2529 | if (slot >= rdev->mddev->raid_disks && |
2530 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2531 | return -ENOSPC; |
2532 | rdev->raid_disk = slot; | |
2533 | /* assume it is working */ | |
c5d79adb N |
2534 | clear_bit(Faulty, &rdev->flags); |
2535 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2536 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2537 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2538 | } |
014236d2 N |
2539 | return len; |
2540 | } | |
2541 | ||
2542 | ||
2543 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2544 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2545 | |
93c8cad0 N |
2546 | static ssize_t |
2547 | offset_show(mdk_rdev_t *rdev, char *page) | |
2548 | { | |
6961ece4 | 2549 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2550 | } |
2551 | ||
2552 | static ssize_t | |
2553 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2554 | { | |
2555 | char *e; | |
2556 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2557 | if (e==buf || (*e && *e != '\n')) | |
2558 | return -EINVAL; | |
8ed0a521 | 2559 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2560 | return -EBUSY; |
dd8ac336 | 2561 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2562 | /* Must set offset before size, so overlap checks |
2563 | * can be sane */ | |
2564 | return -EBUSY; | |
93c8cad0 N |
2565 | rdev->data_offset = offset; |
2566 | return len; | |
2567 | } | |
2568 | ||
2569 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2570 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2571 | |
83303b61 N |
2572 | static ssize_t |
2573 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2574 | { | |
dd8ac336 | 2575 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2576 | } |
2577 | ||
c5d79adb N |
2578 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2579 | { | |
2580 | /* check if two start/length pairs overlap */ | |
2581 | if (s1+l1 <= s2) | |
2582 | return 0; | |
2583 | if (s2+l2 <= s1) | |
2584 | return 0; | |
2585 | return 1; | |
2586 | } | |
2587 | ||
b522adcd DW |
2588 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2589 | { | |
2590 | unsigned long long blocks; | |
2591 | sector_t new; | |
2592 | ||
2593 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2594 | return -EINVAL; | |
2595 | ||
2596 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2597 | return -EINVAL; /* sector conversion overflow */ | |
2598 | ||
2599 | new = blocks * 2; | |
2600 | if (new != blocks * 2) | |
2601 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2602 | ||
2603 | *sectors = new; | |
2604 | return 0; | |
2605 | } | |
2606 | ||
83303b61 N |
2607 | static ssize_t |
2608 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2609 | { | |
27c529bb | 2610 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2611 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2612 | sector_t sectors; |
27c529bb | 2613 | |
b522adcd | 2614 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2615 | return -EINVAL; |
0cd17fec | 2616 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2617 | if (my_mddev->persistent) { |
dd8ac336 AN |
2618 | sectors = super_types[my_mddev->major_version]. |
2619 | rdev_size_change(rdev, sectors); | |
2620 | if (!sectors) | |
0cd17fec | 2621 | return -EBUSY; |
dd8ac336 | 2622 | } else if (!sectors) |
77304d2a | 2623 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2624 | rdev->data_offset; |
0cd17fec | 2625 | } |
dd8ac336 | 2626 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2627 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2628 | |
dd8ac336 AN |
2629 | rdev->sectors = sectors; |
2630 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2631 | /* need to check that all other rdevs with the same ->bdev |
2632 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2633 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2634 | * we have to change it back, we will have the lock again. |
2635 | */ | |
2636 | mddev_t *mddev; | |
2637 | int overlap = 0; | |
159ec1fc | 2638 | struct list_head *tmp; |
c5d79adb | 2639 | |
27c529bb | 2640 | mddev_unlock(my_mddev); |
29ac4aa3 | 2641 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2642 | mdk_rdev_t *rdev2; |
2643 | ||
2644 | mddev_lock(mddev); | |
159ec1fc | 2645 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
f21e9ff7 N |
2646 | if (rdev->bdev == rdev2->bdev && |
2647 | rdev != rdev2 && | |
2648 | overlaps(rdev->data_offset, rdev->sectors, | |
2649 | rdev2->data_offset, | |
2650 | rdev2->sectors)) { | |
c5d79adb N |
2651 | overlap = 1; |
2652 | break; | |
2653 | } | |
2654 | mddev_unlock(mddev); | |
2655 | if (overlap) { | |
2656 | mddev_put(mddev); | |
2657 | break; | |
2658 | } | |
2659 | } | |
27c529bb | 2660 | mddev_lock(my_mddev); |
c5d79adb N |
2661 | if (overlap) { |
2662 | /* Someone else could have slipped in a size | |
2663 | * change here, but doing so is just silly. | |
dd8ac336 | 2664 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2665 | * safe, and trust userspace not to race with |
2666 | * itself | |
2667 | */ | |
dd8ac336 | 2668 | rdev->sectors = oldsectors; |
c5d79adb N |
2669 | return -EBUSY; |
2670 | } | |
2671 | } | |
83303b61 N |
2672 | return len; |
2673 | } | |
2674 | ||
2675 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2676 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2677 | |
06e3c817 DW |
2678 | |
2679 | static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page) | |
2680 | { | |
2681 | unsigned long long recovery_start = rdev->recovery_offset; | |
2682 | ||
2683 | if (test_bit(In_sync, &rdev->flags) || | |
2684 | recovery_start == MaxSector) | |
2685 | return sprintf(page, "none\n"); | |
2686 | ||
2687 | return sprintf(page, "%llu\n", recovery_start); | |
2688 | } | |
2689 | ||
2690 | static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2691 | { | |
2692 | unsigned long long recovery_start; | |
2693 | ||
2694 | if (cmd_match(buf, "none")) | |
2695 | recovery_start = MaxSector; | |
2696 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2697 | return -EINVAL; | |
2698 | ||
2699 | if (rdev->mddev->pers && | |
2700 | rdev->raid_disk >= 0) | |
2701 | return -EBUSY; | |
2702 | ||
2703 | rdev->recovery_offset = recovery_start; | |
2704 | if (recovery_start == MaxSector) | |
2705 | set_bit(In_sync, &rdev->flags); | |
2706 | else | |
2707 | clear_bit(In_sync, &rdev->flags); | |
2708 | return len; | |
2709 | } | |
2710 | ||
2711 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2712 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2713 | ||
16c791a5 N |
2714 | |
2715 | static ssize_t | |
2716 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2717 | static ssize_t | |
2718 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2719 | ||
2720 | static ssize_t bb_show(mdk_rdev_t *rdev, char *page) | |
2721 | { | |
2722 | return badblocks_show(&rdev->badblocks, page, 0); | |
2723 | } | |
2724 | static ssize_t bb_store(mdk_rdev_t *rdev, const char *page, size_t len) | |
2725 | { | |
2726 | return badblocks_store(&rdev->badblocks, page, len, 0); | |
2727 | } | |
2728 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2729 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2730 | ||
2731 | ||
2732 | static ssize_t ubb_show(mdk_rdev_t *rdev, char *page) | |
2733 | { | |
2734 | return badblocks_show(&rdev->badblocks, page, 1); | |
2735 | } | |
2736 | static ssize_t ubb_store(mdk_rdev_t *rdev, const char *page, size_t len) | |
2737 | { | |
2738 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2739 | } | |
2740 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
2741 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
2742 | ||
86e6ffdd N |
2743 | static struct attribute *rdev_default_attrs[] = { |
2744 | &rdev_state.attr, | |
4dbcdc75 | 2745 | &rdev_errors.attr, |
014236d2 | 2746 | &rdev_slot.attr, |
93c8cad0 | 2747 | &rdev_offset.attr, |
83303b61 | 2748 | &rdev_size.attr, |
06e3c817 | 2749 | &rdev_recovery_start.attr, |
16c791a5 N |
2750 | &rdev_bad_blocks.attr, |
2751 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
2752 | NULL, |
2753 | }; | |
2754 | static ssize_t | |
2755 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2756 | { | |
2757 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2758 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2759 | mddev_t *mddev = rdev->mddev; |
2760 | ssize_t rv; | |
86e6ffdd N |
2761 | |
2762 | if (!entry->show) | |
2763 | return -EIO; | |
27c529bb N |
2764 | |
2765 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2766 | if (!rv) { | |
2767 | if (rdev->mddev == NULL) | |
2768 | rv = -EBUSY; | |
2769 | else | |
2770 | rv = entry->show(rdev, page); | |
2771 | mddev_unlock(mddev); | |
2772 | } | |
2773 | return rv; | |
86e6ffdd N |
2774 | } |
2775 | ||
2776 | static ssize_t | |
2777 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2778 | const char *page, size_t length) | |
2779 | { | |
2780 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2781 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2782 | ssize_t rv; |
2783 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2784 | |
2785 | if (!entry->store) | |
2786 | return -EIO; | |
67463acb N |
2787 | if (!capable(CAP_SYS_ADMIN)) |
2788 | return -EACCES; | |
27c529bb | 2789 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2790 | if (!rv) { |
27c529bb N |
2791 | if (rdev->mddev == NULL) |
2792 | rv = -EBUSY; | |
2793 | else | |
2794 | rv = entry->store(rdev, page, length); | |
6a51830e | 2795 | mddev_unlock(mddev); |
ca388059 N |
2796 | } |
2797 | return rv; | |
86e6ffdd N |
2798 | } |
2799 | ||
2800 | static void rdev_free(struct kobject *ko) | |
2801 | { | |
2802 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2803 | kfree(rdev); | |
2804 | } | |
52cf25d0 | 2805 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2806 | .show = rdev_attr_show, |
2807 | .store = rdev_attr_store, | |
2808 | }; | |
2809 | static struct kobj_type rdev_ktype = { | |
2810 | .release = rdev_free, | |
2811 | .sysfs_ops = &rdev_sysfs_ops, | |
2812 | .default_attrs = rdev_default_attrs, | |
2813 | }; | |
2814 | ||
2230dfe4 | 2815 | int md_rdev_init(mdk_rdev_t *rdev) |
e8bb9a83 N |
2816 | { |
2817 | rdev->desc_nr = -1; | |
2818 | rdev->saved_raid_disk = -1; | |
2819 | rdev->raid_disk = -1; | |
2820 | rdev->flags = 0; | |
2821 | rdev->data_offset = 0; | |
2822 | rdev->sb_events = 0; | |
2823 | rdev->last_read_error.tv_sec = 0; | |
2824 | rdev->last_read_error.tv_nsec = 0; | |
2825 | atomic_set(&rdev->nr_pending, 0); | |
2826 | atomic_set(&rdev->read_errors, 0); | |
2827 | atomic_set(&rdev->corrected_errors, 0); | |
2828 | ||
2829 | INIT_LIST_HEAD(&rdev->same_set); | |
2830 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
2831 | |
2832 | /* Add space to store bad block list. | |
2833 | * This reserves the space even on arrays where it cannot | |
2834 | * be used - I wonder if that matters | |
2835 | */ | |
2836 | rdev->badblocks.count = 0; | |
2837 | rdev->badblocks.shift = 0; | |
2838 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
2839 | seqlock_init(&rdev->badblocks.lock); | |
2840 | if (rdev->badblocks.page == NULL) | |
2841 | return -ENOMEM; | |
2842 | ||
2843 | return 0; | |
e8bb9a83 N |
2844 | } |
2845 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
2846 | /* |
2847 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2848 | * | |
2849 | * mark the device faulty if: | |
2850 | * | |
2851 | * - the device is nonexistent (zero size) | |
2852 | * - the device has no valid superblock | |
2853 | * | |
2854 | * a faulty rdev _never_ has rdev->sb set. | |
2855 | */ | |
2856 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2857 | { | |
2858 | char b[BDEVNAME_SIZE]; | |
2859 | int err; | |
2860 | mdk_rdev_t *rdev; | |
2861 | sector_t size; | |
2862 | ||
9ffae0cf | 2863 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2864 | if (!rdev) { |
2865 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2866 | return ERR_PTR(-ENOMEM); | |
2867 | } | |
1da177e4 | 2868 | |
2230dfe4 N |
2869 | err = md_rdev_init(rdev); |
2870 | if (err) | |
2871 | goto abort_free; | |
2872 | err = alloc_disk_sb(rdev); | |
2873 | if (err) | |
1da177e4 LT |
2874 | goto abort_free; |
2875 | ||
c5d79adb | 2876 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2877 | if (err) |
2878 | goto abort_free; | |
2879 | ||
f9cb074b | 2880 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2881 | |
77304d2a | 2882 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 LT |
2883 | if (!size) { |
2884 | printk(KERN_WARNING | |
2885 | "md: %s has zero or unknown size, marking faulty!\n", | |
2886 | bdevname(rdev->bdev,b)); | |
2887 | err = -EINVAL; | |
2888 | goto abort_free; | |
2889 | } | |
2890 | ||
2891 | if (super_format >= 0) { | |
2892 | err = super_types[super_format]. | |
2893 | load_super(rdev, NULL, super_minor); | |
2894 | if (err == -EINVAL) { | |
df968c4e N |
2895 | printk(KERN_WARNING |
2896 | "md: %s does not have a valid v%d.%d " | |
2897 | "superblock, not importing!\n", | |
2898 | bdevname(rdev->bdev,b), | |
2899 | super_format, super_minor); | |
1da177e4 LT |
2900 | goto abort_free; |
2901 | } | |
2902 | if (err < 0) { | |
2903 | printk(KERN_WARNING | |
2904 | "md: could not read %s's sb, not importing!\n", | |
2905 | bdevname(rdev->bdev,b)); | |
2906 | goto abort_free; | |
2907 | } | |
2908 | } | |
6bfe0b49 | 2909 | |
1da177e4 LT |
2910 | return rdev; |
2911 | ||
2912 | abort_free: | |
2913 | if (rdev->sb_page) { | |
2914 | if (rdev->bdev) | |
2915 | unlock_rdev(rdev); | |
2916 | free_disk_sb(rdev); | |
2917 | } | |
2230dfe4 | 2918 | kfree(rdev->badblocks.page); |
1da177e4 LT |
2919 | kfree(rdev); |
2920 | return ERR_PTR(err); | |
2921 | } | |
2922 | ||
2923 | /* | |
2924 | * Check a full RAID array for plausibility | |
2925 | */ | |
2926 | ||
2927 | ||
a757e64c | 2928 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2929 | { |
2930 | int i; | |
159ec1fc | 2931 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2932 | char b[BDEVNAME_SIZE]; |
2933 | ||
2934 | freshest = NULL; | |
d089c6af | 2935 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2936 | switch (super_types[mddev->major_version]. |
2937 | load_super(rdev, freshest, mddev->minor_version)) { | |
2938 | case 1: | |
2939 | freshest = rdev; | |
2940 | break; | |
2941 | case 0: | |
2942 | break; | |
2943 | default: | |
2944 | printk( KERN_ERR \ | |
2945 | "md: fatal superblock inconsistency in %s" | |
2946 | " -- removing from array\n", | |
2947 | bdevname(rdev->bdev,b)); | |
2948 | kick_rdev_from_array(rdev); | |
2949 | } | |
2950 | ||
2951 | ||
2952 | super_types[mddev->major_version]. | |
2953 | validate_super(mddev, freshest); | |
2954 | ||
2955 | i = 0; | |
d089c6af | 2956 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
2957 | if (mddev->max_disks && |
2958 | (rdev->desc_nr >= mddev->max_disks || | |
2959 | i > mddev->max_disks)) { | |
de01dfad N |
2960 | printk(KERN_WARNING |
2961 | "md: %s: %s: only %d devices permitted\n", | |
2962 | mdname(mddev), bdevname(rdev->bdev, b), | |
2963 | mddev->max_disks); | |
2964 | kick_rdev_from_array(rdev); | |
2965 | continue; | |
2966 | } | |
1da177e4 LT |
2967 | if (rdev != freshest) |
2968 | if (super_types[mddev->major_version]. | |
2969 | validate_super(mddev, rdev)) { | |
2970 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2971 | " from array!\n", | |
2972 | bdevname(rdev->bdev,b)); | |
2973 | kick_rdev_from_array(rdev); | |
2974 | continue; | |
2975 | } | |
2976 | if (mddev->level == LEVEL_MULTIPATH) { | |
2977 | rdev->desc_nr = i++; | |
2978 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2979 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 2980 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
2981 | rdev->raid_disk = -1; |
2982 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2983 | } |
2984 | } | |
1da177e4 LT |
2985 | } |
2986 | ||
72e02075 N |
2987 | /* Read a fixed-point number. |
2988 | * Numbers in sysfs attributes should be in "standard" units where | |
2989 | * possible, so time should be in seconds. | |
2990 | * However we internally use a a much smaller unit such as | |
2991 | * milliseconds or jiffies. | |
2992 | * This function takes a decimal number with a possible fractional | |
2993 | * component, and produces an integer which is the result of | |
2994 | * multiplying that number by 10^'scale'. | |
2995 | * all without any floating-point arithmetic. | |
2996 | */ | |
2997 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
2998 | { | |
2999 | unsigned long result = 0; | |
3000 | long decimals = -1; | |
3001 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3002 | if (*cp == '.') | |
3003 | decimals = 0; | |
3004 | else if (decimals < scale) { | |
3005 | unsigned int value; | |
3006 | value = *cp - '0'; | |
3007 | result = result * 10 + value; | |
3008 | if (decimals >= 0) | |
3009 | decimals++; | |
3010 | } | |
3011 | cp++; | |
3012 | } | |
3013 | if (*cp == '\n') | |
3014 | cp++; | |
3015 | if (*cp) | |
3016 | return -EINVAL; | |
3017 | if (decimals < 0) | |
3018 | decimals = 0; | |
3019 | while (decimals < scale) { | |
3020 | result *= 10; | |
3021 | decimals ++; | |
3022 | } | |
3023 | *res = result; | |
3024 | return 0; | |
3025 | } | |
3026 | ||
3027 | ||
19052c0e N |
3028 | static void md_safemode_timeout(unsigned long data); |
3029 | ||
16f17b39 N |
3030 | static ssize_t |
3031 | safe_delay_show(mddev_t *mddev, char *page) | |
3032 | { | |
3033 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3034 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3035 | } | |
3036 | static ssize_t | |
3037 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
3038 | { | |
16f17b39 | 3039 | unsigned long msec; |
97ce0a7f | 3040 | |
72e02075 | 3041 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3042 | return -EINVAL; |
16f17b39 N |
3043 | if (msec == 0) |
3044 | mddev->safemode_delay = 0; | |
3045 | else { | |
19052c0e | 3046 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
3047 | mddev->safemode_delay = (msec*HZ)/1000; |
3048 | if (mddev->safemode_delay == 0) | |
3049 | mddev->safemode_delay = 1; | |
19052c0e N |
3050 | if (mddev->safemode_delay < old_delay) |
3051 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
3052 | } |
3053 | return len; | |
3054 | } | |
3055 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3056 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3057 | |
eae1701f | 3058 | static ssize_t |
96de1e66 | 3059 | level_show(mddev_t *mddev, char *page) |
eae1701f | 3060 | { |
2604b703 | 3061 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 3062 | if (p) |
eae1701f | 3063 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
3064 | else if (mddev->clevel[0]) |
3065 | return sprintf(page, "%s\n", mddev->clevel); | |
3066 | else if (mddev->level != LEVEL_NONE) | |
3067 | return sprintf(page, "%d\n", mddev->level); | |
3068 | else | |
3069 | return 0; | |
eae1701f N |
3070 | } |
3071 | ||
d9d166c2 N |
3072 | static ssize_t |
3073 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
3074 | { | |
f2859af6 | 3075 | char clevel[16]; |
20a49ff6 | 3076 | ssize_t rv = len; |
245f46c2 | 3077 | struct mdk_personality *pers; |
f2859af6 | 3078 | long level; |
245f46c2 | 3079 | void *priv; |
3a981b03 | 3080 | mdk_rdev_t *rdev; |
245f46c2 N |
3081 | |
3082 | if (mddev->pers == NULL) { | |
3083 | if (len == 0) | |
3084 | return 0; | |
3085 | if (len >= sizeof(mddev->clevel)) | |
3086 | return -ENOSPC; | |
3087 | strncpy(mddev->clevel, buf, len); | |
3088 | if (mddev->clevel[len-1] == '\n') | |
3089 | len--; | |
3090 | mddev->clevel[len] = 0; | |
3091 | mddev->level = LEVEL_NONE; | |
3092 | return rv; | |
3093 | } | |
3094 | ||
3095 | /* request to change the personality. Need to ensure: | |
3096 | * - array is not engaged in resync/recovery/reshape | |
3097 | * - old personality can be suspended | |
3098 | * - new personality will access other array. | |
3099 | */ | |
3100 | ||
bb4f1e9d N |
3101 | if (mddev->sync_thread || |
3102 | mddev->reshape_position != MaxSector || | |
3103 | mddev->sysfs_active) | |
d9d166c2 | 3104 | return -EBUSY; |
245f46c2 N |
3105 | |
3106 | if (!mddev->pers->quiesce) { | |
3107 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3108 | mdname(mddev), mddev->pers->name); | |
3109 | return -EINVAL; | |
3110 | } | |
3111 | ||
3112 | /* Now find the new personality */ | |
f2859af6 | 3113 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3114 | return -EINVAL; |
f2859af6 DW |
3115 | strncpy(clevel, buf, len); |
3116 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3117 | len--; |
f2859af6 DW |
3118 | clevel[len] = 0; |
3119 | if (strict_strtol(clevel, 10, &level)) | |
3120 | level = LEVEL_NONE; | |
245f46c2 | 3121 | |
f2859af6 DW |
3122 | if (request_module("md-%s", clevel) != 0) |
3123 | request_module("md-level-%s", clevel); | |
245f46c2 | 3124 | spin_lock(&pers_lock); |
f2859af6 | 3125 | pers = find_pers(level, clevel); |
245f46c2 N |
3126 | if (!pers || !try_module_get(pers->owner)) { |
3127 | spin_unlock(&pers_lock); | |
f2859af6 | 3128 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3129 | return -EINVAL; |
3130 | } | |
3131 | spin_unlock(&pers_lock); | |
3132 | ||
3133 | if (pers == mddev->pers) { | |
3134 | /* Nothing to do! */ | |
3135 | module_put(pers->owner); | |
3136 | return rv; | |
3137 | } | |
3138 | if (!pers->takeover) { | |
3139 | module_put(pers->owner); | |
3140 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3141 | mdname(mddev), clevel); |
245f46c2 N |
3142 | return -EINVAL; |
3143 | } | |
3144 | ||
e93f68a1 N |
3145 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3146 | rdev->new_raid_disk = rdev->raid_disk; | |
3147 | ||
245f46c2 N |
3148 | /* ->takeover must set new_* and/or delta_disks |
3149 | * if it succeeds, and may set them when it fails. | |
3150 | */ | |
3151 | priv = pers->takeover(mddev); | |
3152 | if (IS_ERR(priv)) { | |
3153 | mddev->new_level = mddev->level; | |
3154 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3155 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3156 | mddev->raid_disks -= mddev->delta_disks; |
3157 | mddev->delta_disks = 0; | |
3158 | module_put(pers->owner); | |
3159 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3160 | mdname(mddev), clevel); |
245f46c2 N |
3161 | return PTR_ERR(priv); |
3162 | } | |
3163 | ||
3164 | /* Looks like we have a winner */ | |
3165 | mddev_suspend(mddev); | |
3166 | mddev->pers->stop(mddev); | |
a64c876f N |
3167 | |
3168 | if (mddev->pers->sync_request == NULL && | |
3169 | pers->sync_request != NULL) { | |
3170 | /* need to add the md_redundancy_group */ | |
3171 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3172 | printk(KERN_WARNING | |
3173 | "md: cannot register extra attributes for %s\n", | |
3174 | mdname(mddev)); | |
19fdb9ee | 3175 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3176 | } |
3177 | if (mddev->pers->sync_request != NULL && | |
3178 | pers->sync_request == NULL) { | |
3179 | /* need to remove the md_redundancy_group */ | |
3180 | if (mddev->to_remove == NULL) | |
3181 | mddev->to_remove = &md_redundancy_group; | |
3182 | } | |
3183 | ||
54071b38 TM |
3184 | if (mddev->pers->sync_request == NULL && |
3185 | mddev->external) { | |
3186 | /* We are converting from a no-redundancy array | |
3187 | * to a redundancy array and metadata is managed | |
3188 | * externally so we need to be sure that writes | |
3189 | * won't block due to a need to transition | |
3190 | * clean->dirty | |
3191 | * until external management is started. | |
3192 | */ | |
3193 | mddev->in_sync = 0; | |
3194 | mddev->safemode_delay = 0; | |
3195 | mddev->safemode = 0; | |
3196 | } | |
3197 | ||
e93f68a1 | 3198 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
e93f68a1 N |
3199 | if (rdev->raid_disk < 0) |
3200 | continue; | |
bf2cb0da | 3201 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3202 | rdev->new_raid_disk = -1; |
3203 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3204 | continue; | |
36fad858 | 3205 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 N |
3206 | } |
3207 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3208 | if (rdev->raid_disk < 0) | |
3209 | continue; | |
3210 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3211 | continue; | |
3212 | rdev->raid_disk = rdev->new_raid_disk; | |
3213 | if (rdev->raid_disk < 0) | |
3a981b03 | 3214 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3215 | else { |
36fad858 NK |
3216 | if (sysfs_link_rdev(mddev, rdev)) |
3217 | printk(KERN_WARNING "md: cannot register rd%d" | |
3218 | " for %s after level change\n", | |
3219 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3220 | } |
e93f68a1 N |
3221 | } |
3222 | ||
3223 | module_put(mddev->pers->owner); | |
245f46c2 N |
3224 | mddev->pers = pers; |
3225 | mddev->private = priv; | |
3226 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3227 | mddev->level = mddev->new_level; | |
3228 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3229 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3230 | mddev->delta_disks = 0; |
fee68723 | 3231 | mddev->degraded = 0; |
9af204cf TM |
3232 | if (mddev->pers->sync_request == NULL) { |
3233 | /* this is now an array without redundancy, so | |
3234 | * it must always be in_sync | |
3235 | */ | |
3236 | mddev->in_sync = 1; | |
3237 | del_timer_sync(&mddev->safemode_timer); | |
3238 | } | |
245f46c2 N |
3239 | pers->run(mddev); |
3240 | mddev_resume(mddev); | |
3241 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3242 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3243 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3244 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3245 | md_new_event(mddev); |
d9d166c2 N |
3246 | return rv; |
3247 | } | |
3248 | ||
3249 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3250 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3251 | |
d4dbd025 N |
3252 | |
3253 | static ssize_t | |
3254 | layout_show(mddev_t *mddev, char *page) | |
3255 | { | |
3256 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3257 | if (mddev->reshape_position != MaxSector && |
3258 | mddev->layout != mddev->new_layout) | |
3259 | return sprintf(page, "%d (%d)\n", | |
3260 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3261 | return sprintf(page, "%d\n", mddev->layout); |
3262 | } | |
3263 | ||
3264 | static ssize_t | |
3265 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
3266 | { | |
3267 | char *e; | |
3268 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3269 | |
3270 | if (!*buf || (*e && *e != '\n')) | |
3271 | return -EINVAL; | |
3272 | ||
b3546035 N |
3273 | if (mddev->pers) { |
3274 | int err; | |
50ac168a | 3275 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3276 | return -EBUSY; |
597a711b | 3277 | mddev->new_layout = n; |
50ac168a | 3278 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3279 | if (err) { |
3280 | mddev->new_layout = mddev->layout; | |
b3546035 | 3281 | return err; |
597a711b | 3282 | } |
b3546035 | 3283 | } else { |
08a02ecd | 3284 | mddev->new_layout = n; |
b3546035 N |
3285 | if (mddev->reshape_position == MaxSector) |
3286 | mddev->layout = n; | |
3287 | } | |
d4dbd025 N |
3288 | return len; |
3289 | } | |
3290 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3291 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3292 | |
3293 | ||
eae1701f | 3294 | static ssize_t |
96de1e66 | 3295 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3296 | { |
bb636547 N |
3297 | if (mddev->raid_disks == 0) |
3298 | return 0; | |
08a02ecd N |
3299 | if (mddev->reshape_position != MaxSector && |
3300 | mddev->delta_disks != 0) | |
3301 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3302 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3303 | return sprintf(page, "%d\n", mddev->raid_disks); |
3304 | } | |
3305 | ||
da943b99 N |
3306 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3307 | ||
3308 | static ssize_t | |
3309 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3310 | { | |
da943b99 N |
3311 | char *e; |
3312 | int rv = 0; | |
3313 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3314 | ||
3315 | if (!*buf || (*e && *e != '\n')) | |
3316 | return -EINVAL; | |
3317 | ||
3318 | if (mddev->pers) | |
3319 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3320 | else if (mddev->reshape_position != MaxSector) { |
3321 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3322 | mddev->delta_disks = n - olddisks; | |
3323 | mddev->raid_disks = n; | |
3324 | } else | |
da943b99 N |
3325 | mddev->raid_disks = n; |
3326 | return rv ? rv : len; | |
3327 | } | |
3328 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3329 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3330 | |
3b34380a N |
3331 | static ssize_t |
3332 | chunk_size_show(mddev_t *mddev, char *page) | |
3333 | { | |
08a02ecd | 3334 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3335 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3336 | return sprintf(page, "%d (%d)\n", | |
3337 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3338 | mddev->chunk_sectors << 9); |
3339 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3340 | } |
3341 | ||
3342 | static ssize_t | |
3343 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3344 | { | |
3b34380a N |
3345 | char *e; |
3346 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3347 | ||
3b34380a N |
3348 | if (!*buf || (*e && *e != '\n')) |
3349 | return -EINVAL; | |
3350 | ||
b3546035 N |
3351 | if (mddev->pers) { |
3352 | int err; | |
50ac168a | 3353 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3354 | return -EBUSY; |
597a711b | 3355 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3356 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3357 | if (err) { |
3358 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3359 | return err; |
597a711b | 3360 | } |
b3546035 | 3361 | } else { |
664e7c41 | 3362 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3363 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3364 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3365 | } |
3b34380a N |
3366 | return len; |
3367 | } | |
3368 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3369 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3370 | |
a94213b1 N |
3371 | static ssize_t |
3372 | resync_start_show(mddev_t *mddev, char *page) | |
3373 | { | |
d1a7c503 N |
3374 | if (mddev->recovery_cp == MaxSector) |
3375 | return sprintf(page, "none\n"); | |
a94213b1 N |
3376 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3377 | } | |
3378 | ||
3379 | static ssize_t | |
3380 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3381 | { | |
a94213b1 N |
3382 | char *e; |
3383 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3384 | ||
b098636c | 3385 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3386 | return -EBUSY; |
06e3c817 DW |
3387 | if (cmd_match(buf, "none")) |
3388 | n = MaxSector; | |
3389 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3390 | return -EINVAL; |
3391 | ||
3392 | mddev->recovery_cp = n; | |
3393 | return len; | |
3394 | } | |
3395 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3396 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3397 | |
9e653b63 N |
3398 | /* |
3399 | * The array state can be: | |
3400 | * | |
3401 | * clear | |
3402 | * No devices, no size, no level | |
3403 | * Equivalent to STOP_ARRAY ioctl | |
3404 | * inactive | |
3405 | * May have some settings, but array is not active | |
3406 | * all IO results in error | |
3407 | * When written, doesn't tear down array, but just stops it | |
3408 | * suspended (not supported yet) | |
3409 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3410 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3411 | * readonly |
3412 | * no resync can happen. no superblocks get written. | |
3413 | * write requests fail | |
3414 | * read-auto | |
3415 | * like readonly, but behaves like 'clean' on a write request. | |
3416 | * | |
3417 | * clean - no pending writes, but otherwise active. | |
3418 | * When written to inactive array, starts without resync | |
3419 | * If a write request arrives then | |
3420 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3421 | * if not known, block and switch to write-pending | |
3422 | * If written to an active array that has pending writes, then fails. | |
3423 | * active | |
3424 | * fully active: IO and resync can be happening. | |
3425 | * When written to inactive array, starts with resync | |
3426 | * | |
3427 | * write-pending | |
3428 | * clean, but writes are blocked waiting for 'active' to be written. | |
3429 | * | |
3430 | * active-idle | |
3431 | * like active, but no writes have been seen for a while (100msec). | |
3432 | * | |
3433 | */ | |
3434 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3435 | write_pending, active_idle, bad_word}; | |
05381954 | 3436 | static char *array_states[] = { |
9e653b63 N |
3437 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3438 | "write-pending", "active-idle", NULL }; | |
3439 | ||
3440 | static int match_word(const char *word, char **list) | |
3441 | { | |
3442 | int n; | |
3443 | for (n=0; list[n]; n++) | |
3444 | if (cmd_match(word, list[n])) | |
3445 | break; | |
3446 | return n; | |
3447 | } | |
3448 | ||
3449 | static ssize_t | |
3450 | array_state_show(mddev_t *mddev, char *page) | |
3451 | { | |
3452 | enum array_state st = inactive; | |
3453 | ||
3454 | if (mddev->pers) | |
3455 | switch(mddev->ro) { | |
3456 | case 1: | |
3457 | st = readonly; | |
3458 | break; | |
3459 | case 2: | |
3460 | st = read_auto; | |
3461 | break; | |
3462 | case 0: | |
3463 | if (mddev->in_sync) | |
3464 | st = clean; | |
070dc6dd | 3465 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3466 | st = write_pending; |
9e653b63 N |
3467 | else if (mddev->safemode) |
3468 | st = active_idle; | |
3469 | else | |
3470 | st = active; | |
3471 | } | |
3472 | else { | |
3473 | if (list_empty(&mddev->disks) && | |
3474 | mddev->raid_disks == 0 && | |
58c0fed4 | 3475 | mddev->dev_sectors == 0) |
9e653b63 N |
3476 | st = clear; |
3477 | else | |
3478 | st = inactive; | |
3479 | } | |
3480 | return sprintf(page, "%s\n", array_states[st]); | |
3481 | } | |
3482 | ||
df5b20cf | 3483 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
a4bd82d0 | 3484 | static int md_set_readonly(mddev_t * mddev, int is_open); |
9e653b63 N |
3485 | static int do_md_run(mddev_t * mddev); |
3486 | static int restart_array(mddev_t *mddev); | |
3487 | ||
3488 | static ssize_t | |
3489 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3490 | { | |
3491 | int err = -EINVAL; | |
3492 | enum array_state st = match_word(buf, array_states); | |
3493 | switch(st) { | |
3494 | case bad_word: | |
3495 | break; | |
3496 | case clear: | |
3497 | /* stopping an active array */ | |
f2ea68cf | 3498 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3499 | return -EBUSY; |
df5b20cf | 3500 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3501 | break; |
3502 | case inactive: | |
3503 | /* stopping an active array */ | |
3504 | if (mddev->pers) { | |
f2ea68cf | 3505 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3506 | return -EBUSY; |
df5b20cf | 3507 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3508 | } else |
3509 | err = 0; /* already inactive */ | |
9e653b63 N |
3510 | break; |
3511 | case suspended: | |
3512 | break; /* not supported yet */ | |
3513 | case readonly: | |
3514 | if (mddev->pers) | |
a4bd82d0 | 3515 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3516 | else { |
3517 | mddev->ro = 1; | |
648b629e | 3518 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3519 | err = do_md_run(mddev); |
3520 | } | |
3521 | break; | |
3522 | case read_auto: | |
9e653b63 | 3523 | if (mddev->pers) { |
80268ee9 | 3524 | if (mddev->ro == 0) |
a4bd82d0 | 3525 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3526 | else if (mddev->ro == 1) |
648b629e N |
3527 | err = restart_array(mddev); |
3528 | if (err == 0) { | |
3529 | mddev->ro = 2; | |
3530 | set_disk_ro(mddev->gendisk, 0); | |
3531 | } | |
9e653b63 N |
3532 | } else { |
3533 | mddev->ro = 2; | |
3534 | err = do_md_run(mddev); | |
3535 | } | |
3536 | break; | |
3537 | case clean: | |
3538 | if (mddev->pers) { | |
3539 | restart_array(mddev); | |
3540 | spin_lock_irq(&mddev->write_lock); | |
3541 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3542 | if (mddev->in_sync == 0) { |
3543 | mddev->in_sync = 1; | |
31a59e34 N |
3544 | if (mddev->safemode == 1) |
3545 | mddev->safemode = 0; | |
070dc6dd | 3546 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3547 | } |
3548 | err = 0; | |
3549 | } else | |
3550 | err = -EBUSY; | |
9e653b63 | 3551 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3552 | } else |
3553 | err = -EINVAL; | |
9e653b63 N |
3554 | break; |
3555 | case active: | |
3556 | if (mddev->pers) { | |
3557 | restart_array(mddev); | |
070dc6dd | 3558 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3559 | wake_up(&mddev->sb_wait); |
3560 | err = 0; | |
3561 | } else { | |
3562 | mddev->ro = 0; | |
648b629e | 3563 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3564 | err = do_md_run(mddev); |
3565 | } | |
3566 | break; | |
3567 | case write_pending: | |
3568 | case active_idle: | |
3569 | /* these cannot be set */ | |
3570 | break; | |
3571 | } | |
3572 | if (err) | |
3573 | return err; | |
0fd62b86 | 3574 | else { |
00bcb4ac | 3575 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3576 | return len; |
0fd62b86 | 3577 | } |
9e653b63 | 3578 | } |
80ca3a44 N |
3579 | static struct md_sysfs_entry md_array_state = |
3580 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3581 | |
1e50915f RB |
3582 | static ssize_t |
3583 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3584 | return sprintf(page, "%d\n", | |
3585 | atomic_read(&mddev->max_corr_read_errors)); | |
3586 | } | |
3587 | ||
3588 | static ssize_t | |
3589 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3590 | { | |
3591 | char *e; | |
3592 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3593 | ||
3594 | if (*buf && (*e == 0 || *e == '\n')) { | |
3595 | atomic_set(&mddev->max_corr_read_errors, n); | |
3596 | return len; | |
3597 | } | |
3598 | return -EINVAL; | |
3599 | } | |
3600 | ||
3601 | static struct md_sysfs_entry max_corr_read_errors = | |
3602 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3603 | max_corrected_read_errors_store); | |
3604 | ||
6d7ff738 N |
3605 | static ssize_t |
3606 | null_show(mddev_t *mddev, char *page) | |
3607 | { | |
3608 | return -EINVAL; | |
3609 | } | |
3610 | ||
3611 | static ssize_t | |
3612 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3613 | { | |
3614 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3615 | /* The new device is added to the array. | |
3616 | * If the array has a persistent superblock, we read the | |
3617 | * superblock to initialise info and check validity. | |
3618 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3619 | * which mainly checks size. | |
3620 | */ | |
3621 | char *e; | |
3622 | int major = simple_strtoul(buf, &e, 10); | |
3623 | int minor; | |
3624 | dev_t dev; | |
3625 | mdk_rdev_t *rdev; | |
3626 | int err; | |
3627 | ||
3628 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3629 | return -EINVAL; | |
3630 | minor = simple_strtoul(e+1, &e, 10); | |
3631 | if (*e && *e != '\n') | |
3632 | return -EINVAL; | |
3633 | dev = MKDEV(major, minor); | |
3634 | if (major != MAJOR(dev) || | |
3635 | minor != MINOR(dev)) | |
3636 | return -EOVERFLOW; | |
3637 | ||
3638 | ||
3639 | if (mddev->persistent) { | |
3640 | rdev = md_import_device(dev, mddev->major_version, | |
3641 | mddev->minor_version); | |
3642 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3643 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3644 | mdk_rdev_t, same_set); | |
3645 | err = super_types[mddev->major_version] | |
3646 | .load_super(rdev, rdev0, mddev->minor_version); | |
3647 | if (err < 0) | |
3648 | goto out; | |
3649 | } | |
c5d79adb N |
3650 | } else if (mddev->external) |
3651 | rdev = md_import_device(dev, -2, -1); | |
3652 | else | |
6d7ff738 N |
3653 | rdev = md_import_device(dev, -1, -1); |
3654 | ||
3655 | if (IS_ERR(rdev)) | |
3656 | return PTR_ERR(rdev); | |
3657 | err = bind_rdev_to_array(rdev, mddev); | |
3658 | out: | |
3659 | if (err) | |
3660 | export_rdev(rdev); | |
3661 | return err ? err : len; | |
3662 | } | |
3663 | ||
3664 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3665 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3666 | |
9b1d1dac PC |
3667 | static ssize_t |
3668 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3669 | { | |
3670 | char *end; | |
3671 | unsigned long chunk, end_chunk; | |
3672 | ||
3673 | if (!mddev->bitmap) | |
3674 | goto out; | |
3675 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3676 | while (*buf) { | |
3677 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3678 | if (buf == end) break; | |
3679 | if (*end == '-') { /* range */ | |
3680 | buf = end + 1; | |
3681 | end_chunk = simple_strtoul(buf, &end, 0); | |
3682 | if (buf == end) break; | |
3683 | } | |
3684 | if (*end && !isspace(*end)) break; | |
3685 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3686 | buf = skip_spaces(end); |
9b1d1dac PC |
3687 | } |
3688 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3689 | out: | |
3690 | return len; | |
3691 | } | |
3692 | ||
3693 | static struct md_sysfs_entry md_bitmap = | |
3694 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3695 | ||
a35b0d69 N |
3696 | static ssize_t |
3697 | size_show(mddev_t *mddev, char *page) | |
3698 | { | |
58c0fed4 AN |
3699 | return sprintf(page, "%llu\n", |
3700 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3701 | } |
3702 | ||
d71f9f88 | 3703 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3704 | |
3705 | static ssize_t | |
3706 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3707 | { | |
3708 | /* If array is inactive, we can reduce the component size, but | |
3709 | * not increase it (except from 0). | |
3710 | * If array is active, we can try an on-line resize | |
3711 | */ | |
b522adcd DW |
3712 | sector_t sectors; |
3713 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3714 | |
58c0fed4 AN |
3715 | if (err < 0) |
3716 | return err; | |
a35b0d69 | 3717 | if (mddev->pers) { |
58c0fed4 | 3718 | err = update_size(mddev, sectors); |
850b2b42 | 3719 | md_update_sb(mddev, 1); |
a35b0d69 | 3720 | } else { |
58c0fed4 AN |
3721 | if (mddev->dev_sectors == 0 || |
3722 | mddev->dev_sectors > sectors) | |
3723 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3724 | else |
3725 | err = -ENOSPC; | |
3726 | } | |
3727 | return err ? err : len; | |
3728 | } | |
3729 | ||
3730 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3731 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3732 | |
8bb93aac N |
3733 | |
3734 | /* Metdata version. | |
e691063a N |
3735 | * This is one of |
3736 | * 'none' for arrays with no metadata (good luck...) | |
3737 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3738 | * or N.M for internally known formats |
3739 | */ | |
3740 | static ssize_t | |
3741 | metadata_show(mddev_t *mddev, char *page) | |
3742 | { | |
3743 | if (mddev->persistent) | |
3744 | return sprintf(page, "%d.%d\n", | |
3745 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3746 | else if (mddev->external) |
3747 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3748 | else |
3749 | return sprintf(page, "none\n"); | |
3750 | } | |
3751 | ||
3752 | static ssize_t | |
3753 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3754 | { | |
3755 | int major, minor; | |
3756 | char *e; | |
ea43ddd8 N |
3757 | /* Changing the details of 'external' metadata is |
3758 | * always permitted. Otherwise there must be | |
3759 | * no devices attached to the array. | |
3760 | */ | |
3761 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3762 | ; | |
3763 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3764 | return -EBUSY; |
3765 | ||
3766 | if (cmd_match(buf, "none")) { | |
3767 | mddev->persistent = 0; | |
e691063a N |
3768 | mddev->external = 0; |
3769 | mddev->major_version = 0; | |
3770 | mddev->minor_version = 90; | |
3771 | return len; | |
3772 | } | |
3773 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3774 | size_t namelen = len-9; |
e691063a N |
3775 | if (namelen >= sizeof(mddev->metadata_type)) |
3776 | namelen = sizeof(mddev->metadata_type)-1; | |
3777 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3778 | mddev->metadata_type[namelen] = 0; | |
3779 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3780 | mddev->metadata_type[--namelen] = 0; | |
3781 | mddev->persistent = 0; | |
3782 | mddev->external = 1; | |
8bb93aac N |
3783 | mddev->major_version = 0; |
3784 | mddev->minor_version = 90; | |
3785 | return len; | |
3786 | } | |
3787 | major = simple_strtoul(buf, &e, 10); | |
3788 | if (e==buf || *e != '.') | |
3789 | return -EINVAL; | |
3790 | buf = e+1; | |
3791 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3792 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3793 | return -EINVAL; |
50511da3 | 3794 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3795 | return -ENOENT; |
3796 | mddev->major_version = major; | |
3797 | mddev->minor_version = minor; | |
3798 | mddev->persistent = 1; | |
e691063a | 3799 | mddev->external = 0; |
8bb93aac N |
3800 | return len; |
3801 | } | |
3802 | ||
3803 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3804 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3805 | |
24dd469d | 3806 | static ssize_t |
7eec314d | 3807 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3808 | { |
7eec314d | 3809 | char *type = "idle"; |
b6a9ce68 N |
3810 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3811 | type = "frozen"; | |
3812 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3813 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3814 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3815 | type = "reshape"; | |
3816 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3817 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3818 | type = "resync"; | |
3819 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3820 | type = "check"; | |
3821 | else | |
3822 | type = "repair"; | |
72a23c21 | 3823 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3824 | type = "recover"; |
3825 | } | |
3826 | return sprintf(page, "%s\n", type); | |
3827 | } | |
3828 | ||
7ebc0be7 N |
3829 | static void reap_sync_thread(mddev_t *mddev); |
3830 | ||
24dd469d | 3831 | static ssize_t |
7eec314d | 3832 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3833 | { |
7eec314d N |
3834 | if (!mddev->pers || !mddev->pers->sync_request) |
3835 | return -EINVAL; | |
3836 | ||
b6a9ce68 N |
3837 | if (cmd_match(page, "frozen")) |
3838 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3839 | else | |
3840 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3841 | ||
3842 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
3843 | if (mddev->sync_thread) { |
3844 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 3845 | reap_sync_thread(mddev); |
7eec314d | 3846 | } |
03c902e1 N |
3847 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3848 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3849 | return -EBUSY; |
72a23c21 NB |
3850 | else if (cmd_match(page, "resync")) |
3851 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3852 | else if (cmd_match(page, "recover")) { | |
3853 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3854 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3855 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3856 | int err; |
3857 | if (mddev->pers->start_reshape == NULL) | |
3858 | return -EINVAL; | |
3859 | err = mddev->pers->start_reshape(mddev); | |
3860 | if (err) | |
3861 | return err; | |
a99ac971 | 3862 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3863 | } else { |
bce74dac | 3864 | if (cmd_match(page, "check")) |
7eec314d | 3865 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3866 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3867 | return -EINVAL; |
3868 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3869 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3870 | } |
03c902e1 | 3871 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3872 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 3873 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
3874 | return len; |
3875 | } | |
3876 | ||
9d88883e | 3877 | static ssize_t |
96de1e66 | 3878 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3879 | { |
3880 | return sprintf(page, "%llu\n", | |
3881 | (unsigned long long) mddev->resync_mismatches); | |
3882 | } | |
3883 | ||
80ca3a44 N |
3884 | static struct md_sysfs_entry md_scan_mode = |
3885 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3886 | |
96de1e66 | 3887 | |
80ca3a44 | 3888 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3889 | |
88202a0c N |
3890 | static ssize_t |
3891 | sync_min_show(mddev_t *mddev, char *page) | |
3892 | { | |
3893 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3894 | mddev->sync_speed_min ? "local": "system"); | |
3895 | } | |
3896 | ||
3897 | static ssize_t | |
3898 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3899 | { | |
3900 | int min; | |
3901 | char *e; | |
3902 | if (strncmp(buf, "system", 6)==0) { | |
3903 | mddev->sync_speed_min = 0; | |
3904 | return len; | |
3905 | } | |
3906 | min = simple_strtoul(buf, &e, 10); | |
3907 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3908 | return -EINVAL; | |
3909 | mddev->sync_speed_min = min; | |
3910 | return len; | |
3911 | } | |
3912 | ||
3913 | static struct md_sysfs_entry md_sync_min = | |
3914 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3915 | ||
3916 | static ssize_t | |
3917 | sync_max_show(mddev_t *mddev, char *page) | |
3918 | { | |
3919 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3920 | mddev->sync_speed_max ? "local": "system"); | |
3921 | } | |
3922 | ||
3923 | static ssize_t | |
3924 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3925 | { | |
3926 | int max; | |
3927 | char *e; | |
3928 | if (strncmp(buf, "system", 6)==0) { | |
3929 | mddev->sync_speed_max = 0; | |
3930 | return len; | |
3931 | } | |
3932 | max = simple_strtoul(buf, &e, 10); | |
3933 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3934 | return -EINVAL; | |
3935 | mddev->sync_speed_max = max; | |
3936 | return len; | |
3937 | } | |
3938 | ||
3939 | static struct md_sysfs_entry md_sync_max = | |
3940 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3941 | ||
d7f3d291 IP |
3942 | static ssize_t |
3943 | degraded_show(mddev_t *mddev, char *page) | |
3944 | { | |
3945 | return sprintf(page, "%d\n", mddev->degraded); | |
3946 | } | |
3947 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3948 | |
90b08710 BS |
3949 | static ssize_t |
3950 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3951 | { | |
3952 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3953 | } | |
3954 | ||
3955 | static ssize_t | |
3956 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3957 | { | |
3958 | long n; | |
3959 | ||
3960 | if (strict_strtol(buf, 10, &n)) | |
3961 | return -EINVAL; | |
3962 | ||
3963 | if (n != 0 && n != 1) | |
3964 | return -EINVAL; | |
3965 | ||
3966 | mddev->parallel_resync = n; | |
3967 | ||
3968 | if (mddev->sync_thread) | |
3969 | wake_up(&resync_wait); | |
3970 | ||
3971 | return len; | |
3972 | } | |
3973 | ||
3974 | /* force parallel resync, even with shared block devices */ | |
3975 | static struct md_sysfs_entry md_sync_force_parallel = | |
3976 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3977 | sync_force_parallel_show, sync_force_parallel_store); | |
3978 | ||
88202a0c N |
3979 | static ssize_t |
3980 | sync_speed_show(mddev_t *mddev, char *page) | |
3981 | { | |
3982 | unsigned long resync, dt, db; | |
d1a7c503 N |
3983 | if (mddev->curr_resync == 0) |
3984 | return sprintf(page, "none\n"); | |
9687a60c AN |
3985 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3986 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3987 | if (!dt) dt++; |
9687a60c AN |
3988 | db = resync - mddev->resync_mark_cnt; |
3989 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3990 | } |
3991 | ||
80ca3a44 | 3992 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3993 | |
3994 | static ssize_t | |
3995 | sync_completed_show(mddev_t *mddev, char *page) | |
3996 | { | |
13ae864b | 3997 | unsigned long long max_sectors, resync; |
88202a0c | 3998 | |
acb180b0 N |
3999 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4000 | return sprintf(page, "none\n"); | |
4001 | ||
88202a0c | 4002 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 4003 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4004 | else |
58c0fed4 | 4005 | max_sectors = mddev->dev_sectors; |
88202a0c | 4006 | |
acb180b0 | 4007 | resync = mddev->curr_resync_completed; |
13ae864b | 4008 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4009 | } |
4010 | ||
80ca3a44 | 4011 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4012 | |
5e96ee65 NB |
4013 | static ssize_t |
4014 | min_sync_show(mddev_t *mddev, char *page) | |
4015 | { | |
4016 | return sprintf(page, "%llu\n", | |
4017 | (unsigned long long)mddev->resync_min); | |
4018 | } | |
4019 | static ssize_t | |
4020 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
4021 | { | |
4022 | unsigned long long min; | |
4023 | if (strict_strtoull(buf, 10, &min)) | |
4024 | return -EINVAL; | |
4025 | if (min > mddev->resync_max) | |
4026 | return -EINVAL; | |
4027 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4028 | return -EBUSY; | |
4029 | ||
4030 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4031 | if (mddev->chunk_sectors) { |
2ac06c33 | 4032 | sector_t temp = min; |
9d8f0363 | 4033 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4034 | return -EINVAL; |
4035 | } | |
4036 | mddev->resync_min = min; | |
4037 | ||
4038 | return len; | |
4039 | } | |
4040 | ||
4041 | static struct md_sysfs_entry md_min_sync = | |
4042 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4043 | ||
c6207277 N |
4044 | static ssize_t |
4045 | max_sync_show(mddev_t *mddev, char *page) | |
4046 | { | |
4047 | if (mddev->resync_max == MaxSector) | |
4048 | return sprintf(page, "max\n"); | |
4049 | else | |
4050 | return sprintf(page, "%llu\n", | |
4051 | (unsigned long long)mddev->resync_max); | |
4052 | } | |
4053 | static ssize_t | |
4054 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
4055 | { | |
4056 | if (strncmp(buf, "max", 3) == 0) | |
4057 | mddev->resync_max = MaxSector; | |
4058 | else { | |
5e96ee65 NB |
4059 | unsigned long long max; |
4060 | if (strict_strtoull(buf, 10, &max)) | |
4061 | return -EINVAL; | |
4062 | if (max < mddev->resync_min) | |
c6207277 N |
4063 | return -EINVAL; |
4064 | if (max < mddev->resync_max && | |
4d484a4a | 4065 | mddev->ro == 0 && |
c6207277 N |
4066 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4067 | return -EBUSY; | |
4068 | ||
4069 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4070 | if (mddev->chunk_sectors) { |
2ac06c33 | 4071 | sector_t temp = max; |
9d8f0363 | 4072 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4073 | return -EINVAL; |
4074 | } | |
4075 | mddev->resync_max = max; | |
4076 | } | |
4077 | wake_up(&mddev->recovery_wait); | |
4078 | return len; | |
4079 | } | |
4080 | ||
4081 | static struct md_sysfs_entry md_max_sync = | |
4082 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4083 | ||
e464eafd N |
4084 | static ssize_t |
4085 | suspend_lo_show(mddev_t *mddev, char *page) | |
4086 | { | |
4087 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4088 | } | |
4089 | ||
4090 | static ssize_t | |
4091 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
4092 | { | |
4093 | char *e; | |
4094 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4095 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4096 | |
b8d966ef N |
4097 | if (mddev->pers == NULL || |
4098 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4099 | return -EINVAL; |
4100 | if (buf == e || (*e && *e != '\n')) | |
4101 | return -EINVAL; | |
23ddff37 N |
4102 | |
4103 | mddev->suspend_lo = new; | |
4104 | if (new >= old) | |
4105 | /* Shrinking suspended region */ | |
e464eafd | 4106 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4107 | else { |
4108 | /* Expanding suspended region - need to wait */ | |
4109 | mddev->pers->quiesce(mddev, 1); | |
4110 | mddev->pers->quiesce(mddev, 0); | |
4111 | } | |
4112 | return len; | |
e464eafd N |
4113 | } |
4114 | static struct md_sysfs_entry md_suspend_lo = | |
4115 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4116 | ||
4117 | ||
4118 | static ssize_t | |
4119 | suspend_hi_show(mddev_t *mddev, char *page) | |
4120 | { | |
4121 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4122 | } | |
4123 | ||
4124 | static ssize_t | |
4125 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
4126 | { | |
4127 | char *e; | |
4128 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4129 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4130 | |
b8d966ef N |
4131 | if (mddev->pers == NULL || |
4132 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4133 | return -EINVAL; |
4134 | if (buf == e || (*e && *e != '\n')) | |
4135 | return -EINVAL; | |
23ddff37 N |
4136 | |
4137 | mddev->suspend_hi = new; | |
4138 | if (new <= old) | |
4139 | /* Shrinking suspended region */ | |
4140 | mddev->pers->quiesce(mddev, 2); | |
4141 | else { | |
4142 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4143 | mddev->pers->quiesce(mddev, 1); |
4144 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4145 | } |
4146 | return len; | |
e464eafd N |
4147 | } |
4148 | static struct md_sysfs_entry md_suspend_hi = | |
4149 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4150 | ||
08a02ecd N |
4151 | static ssize_t |
4152 | reshape_position_show(mddev_t *mddev, char *page) | |
4153 | { | |
4154 | if (mddev->reshape_position != MaxSector) | |
4155 | return sprintf(page, "%llu\n", | |
4156 | (unsigned long long)mddev->reshape_position); | |
4157 | strcpy(page, "none\n"); | |
4158 | return 5; | |
4159 | } | |
4160 | ||
4161 | static ssize_t | |
4162 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
4163 | { | |
4164 | char *e; | |
4165 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4166 | if (mddev->pers) | |
4167 | return -EBUSY; | |
4168 | if (buf == e || (*e && *e != '\n')) | |
4169 | return -EINVAL; | |
4170 | mddev->reshape_position = new; | |
4171 | mddev->delta_disks = 0; | |
4172 | mddev->new_level = mddev->level; | |
4173 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4174 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4175 | return len; |
4176 | } | |
4177 | ||
4178 | static struct md_sysfs_entry md_reshape_position = | |
4179 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4180 | reshape_position_store); | |
4181 | ||
b522adcd DW |
4182 | static ssize_t |
4183 | array_size_show(mddev_t *mddev, char *page) | |
4184 | { | |
4185 | if (mddev->external_size) | |
4186 | return sprintf(page, "%llu\n", | |
4187 | (unsigned long long)mddev->array_sectors/2); | |
4188 | else | |
4189 | return sprintf(page, "default\n"); | |
4190 | } | |
4191 | ||
4192 | static ssize_t | |
4193 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
4194 | { | |
4195 | sector_t sectors; | |
4196 | ||
4197 | if (strncmp(buf, "default", 7) == 0) { | |
4198 | if (mddev->pers) | |
4199 | sectors = mddev->pers->size(mddev, 0, 0); | |
4200 | else | |
4201 | sectors = mddev->array_sectors; | |
4202 | ||
4203 | mddev->external_size = 0; | |
4204 | } else { | |
4205 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4206 | return -EINVAL; | |
4207 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4208 | return -E2BIG; |
b522adcd DW |
4209 | |
4210 | mddev->external_size = 1; | |
4211 | } | |
4212 | ||
4213 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4214 | if (mddev->pers) { |
4215 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4216 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4217 | } |
b522adcd DW |
4218 | return len; |
4219 | } | |
4220 | ||
4221 | static struct md_sysfs_entry md_array_size = | |
4222 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4223 | array_size_store); | |
e464eafd | 4224 | |
eae1701f N |
4225 | static struct attribute *md_default_attrs[] = { |
4226 | &md_level.attr, | |
d4dbd025 | 4227 | &md_layout.attr, |
eae1701f | 4228 | &md_raid_disks.attr, |
3b34380a | 4229 | &md_chunk_size.attr, |
a35b0d69 | 4230 | &md_size.attr, |
a94213b1 | 4231 | &md_resync_start.attr, |
8bb93aac | 4232 | &md_metadata.attr, |
6d7ff738 | 4233 | &md_new_device.attr, |
16f17b39 | 4234 | &md_safe_delay.attr, |
9e653b63 | 4235 | &md_array_state.attr, |
08a02ecd | 4236 | &md_reshape_position.attr, |
b522adcd | 4237 | &md_array_size.attr, |
1e50915f | 4238 | &max_corr_read_errors.attr, |
411036fa N |
4239 | NULL, |
4240 | }; | |
4241 | ||
4242 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4243 | &md_scan_mode.attr, |
9d88883e | 4244 | &md_mismatches.attr, |
88202a0c N |
4245 | &md_sync_min.attr, |
4246 | &md_sync_max.attr, | |
4247 | &md_sync_speed.attr, | |
90b08710 | 4248 | &md_sync_force_parallel.attr, |
88202a0c | 4249 | &md_sync_completed.attr, |
5e96ee65 | 4250 | &md_min_sync.attr, |
c6207277 | 4251 | &md_max_sync.attr, |
e464eafd N |
4252 | &md_suspend_lo.attr, |
4253 | &md_suspend_hi.attr, | |
9b1d1dac | 4254 | &md_bitmap.attr, |
d7f3d291 | 4255 | &md_degraded.attr, |
eae1701f N |
4256 | NULL, |
4257 | }; | |
411036fa N |
4258 | static struct attribute_group md_redundancy_group = { |
4259 | .name = NULL, | |
4260 | .attrs = md_redundancy_attrs, | |
4261 | }; | |
4262 | ||
eae1701f N |
4263 | |
4264 | static ssize_t | |
4265 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4266 | { | |
4267 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4268 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4269 | ssize_t rv; |
eae1701f N |
4270 | |
4271 | if (!entry->show) | |
4272 | return -EIO; | |
5dc5cf7d IM |
4273 | rv = mddev_lock(mddev); |
4274 | if (!rv) { | |
4275 | rv = entry->show(mddev, page); | |
4276 | mddev_unlock(mddev); | |
4277 | } | |
96de1e66 | 4278 | return rv; |
eae1701f N |
4279 | } |
4280 | ||
4281 | static ssize_t | |
4282 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4283 | const char *page, size_t length) | |
4284 | { | |
4285 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4286 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4287 | ssize_t rv; |
eae1701f N |
4288 | |
4289 | if (!entry->store) | |
4290 | return -EIO; | |
67463acb N |
4291 | if (!capable(CAP_SYS_ADMIN)) |
4292 | return -EACCES; | |
5dc5cf7d | 4293 | rv = mddev_lock(mddev); |
d3374825 N |
4294 | if (mddev->hold_active == UNTIL_IOCTL) |
4295 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4296 | if (!rv) { |
4297 | rv = entry->store(mddev, page, length); | |
4298 | mddev_unlock(mddev); | |
4299 | } | |
96de1e66 | 4300 | return rv; |
eae1701f N |
4301 | } |
4302 | ||
4303 | static void md_free(struct kobject *ko) | |
4304 | { | |
4305 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4306 | |
4307 | if (mddev->sysfs_state) | |
4308 | sysfs_put(mddev->sysfs_state); | |
4309 | ||
4310 | if (mddev->gendisk) { | |
4311 | del_gendisk(mddev->gendisk); | |
4312 | put_disk(mddev->gendisk); | |
4313 | } | |
4314 | if (mddev->queue) | |
4315 | blk_cleanup_queue(mddev->queue); | |
4316 | ||
eae1701f N |
4317 | kfree(mddev); |
4318 | } | |
4319 | ||
52cf25d0 | 4320 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4321 | .show = md_attr_show, |
4322 | .store = md_attr_store, | |
4323 | }; | |
4324 | static struct kobj_type md_ktype = { | |
4325 | .release = md_free, | |
4326 | .sysfs_ops = &md_sysfs_ops, | |
4327 | .default_attrs = md_default_attrs, | |
4328 | }; | |
4329 | ||
1da177e4 LT |
4330 | int mdp_major = 0; |
4331 | ||
5fd3a17e DW |
4332 | static void mddev_delayed_delete(struct work_struct *ws) |
4333 | { | |
4334 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4335 | ||
43a70507 | 4336 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4337 | kobject_del(&mddev->kobj); |
4338 | kobject_put(&mddev->kobj); | |
4339 | } | |
4340 | ||
efeb53c0 | 4341 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4342 | { |
48c9c27b | 4343 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4344 | mddev_t *mddev = mddev_find(dev); |
4345 | struct gendisk *disk; | |
efeb53c0 N |
4346 | int partitioned; |
4347 | int shift; | |
4348 | int unit; | |
3830c62f | 4349 | int error; |
1da177e4 LT |
4350 | |
4351 | if (!mddev) | |
efeb53c0 N |
4352 | return -ENODEV; |
4353 | ||
4354 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4355 | shift = partitioned ? MdpMinorShift : 0; | |
4356 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4357 | |
e804ac78 TH |
4358 | /* wait for any previous instance of this device to be |
4359 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4360 | */ |
e804ac78 | 4361 | flush_workqueue(md_misc_wq); |
d3374825 | 4362 | |
48c9c27b | 4363 | mutex_lock(&disks_mutex); |
0909dc44 N |
4364 | error = -EEXIST; |
4365 | if (mddev->gendisk) | |
4366 | goto abort; | |
efeb53c0 N |
4367 | |
4368 | if (name) { | |
4369 | /* Need to ensure that 'name' is not a duplicate. | |
4370 | */ | |
4371 | mddev_t *mddev2; | |
4372 | spin_lock(&all_mddevs_lock); | |
4373 | ||
4374 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4375 | if (mddev2->gendisk && | |
4376 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4377 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4378 | goto abort; |
efeb53c0 N |
4379 | } |
4380 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4381 | } |
8b765398 | 4382 | |
0909dc44 | 4383 | error = -ENOMEM; |
8b765398 | 4384 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4385 | if (!mddev->queue) |
4386 | goto abort; | |
409c57f3 N |
4387 | mddev->queue->queuedata = mddev; |
4388 | ||
409c57f3 | 4389 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4390 | |
1da177e4 LT |
4391 | disk = alloc_disk(1 << shift); |
4392 | if (!disk) { | |
8b765398 N |
4393 | blk_cleanup_queue(mddev->queue); |
4394 | mddev->queue = NULL; | |
0909dc44 | 4395 | goto abort; |
1da177e4 | 4396 | } |
efeb53c0 | 4397 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4398 | disk->first_minor = unit << shift; |
efeb53c0 N |
4399 | if (name) |
4400 | strcpy(disk->disk_name, name); | |
4401 | else if (partitioned) | |
1da177e4 | 4402 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4403 | else |
1da177e4 | 4404 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4405 | disk->fops = &md_fops; |
4406 | disk->private_data = mddev; | |
4407 | disk->queue = mddev->queue; | |
b0140891 | 4408 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4409 | /* Allow extended partitions. This makes the |
d3374825 | 4410 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4411 | * remove it now. |
4412 | */ | |
4413 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4414 | mddev->gendisk = disk; |
b0140891 N |
4415 | /* As soon as we call add_disk(), another thread could get |
4416 | * through to md_open, so make sure it doesn't get too far | |
4417 | */ | |
4418 | mutex_lock(&mddev->open_mutex); | |
4419 | add_disk(disk); | |
4420 | ||
ed9e1982 TH |
4421 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4422 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4423 | if (error) { |
4424 | /* This isn't possible, but as kobject_init_and_add is marked | |
4425 | * __must_check, we must do something with the result | |
4426 | */ | |
5e55e2f5 N |
4427 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4428 | disk->disk_name); | |
0909dc44 N |
4429 | error = 0; |
4430 | } | |
00bcb4ac N |
4431 | if (mddev->kobj.sd && |
4432 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4433 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4434 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4435 | abort: |
4436 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4437 | if (!error && mddev->kobj.sd) { |
3830c62f | 4438 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4439 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4440 | } |
d3374825 | 4441 | mddev_put(mddev); |
0909dc44 | 4442 | return error; |
efeb53c0 N |
4443 | } |
4444 | ||
4445 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4446 | { | |
4447 | md_alloc(dev, NULL); | |
1da177e4 LT |
4448 | return NULL; |
4449 | } | |
4450 | ||
efeb53c0 N |
4451 | static int add_named_array(const char *val, struct kernel_param *kp) |
4452 | { | |
4453 | /* val must be "md_*" where * is not all digits. | |
4454 | * We allocate an array with a large free minor number, and | |
4455 | * set the name to val. val must not already be an active name. | |
4456 | */ | |
4457 | int len = strlen(val); | |
4458 | char buf[DISK_NAME_LEN]; | |
4459 | ||
4460 | while (len && val[len-1] == '\n') | |
4461 | len--; | |
4462 | if (len >= DISK_NAME_LEN) | |
4463 | return -E2BIG; | |
4464 | strlcpy(buf, val, len+1); | |
4465 | if (strncmp(buf, "md_", 3) != 0) | |
4466 | return -EINVAL; | |
4467 | return md_alloc(0, buf); | |
4468 | } | |
4469 | ||
1da177e4 LT |
4470 | static void md_safemode_timeout(unsigned long data) |
4471 | { | |
4472 | mddev_t *mddev = (mddev_t *) data; | |
4473 | ||
0fd62b86 NB |
4474 | if (!atomic_read(&mddev->writes_pending)) { |
4475 | mddev->safemode = 1; | |
4476 | if (mddev->external) | |
00bcb4ac | 4477 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4478 | } |
1da177e4 LT |
4479 | md_wakeup_thread(mddev->thread); |
4480 | } | |
4481 | ||
6ff8d8ec | 4482 | static int start_dirty_degraded; |
1da177e4 | 4483 | |
390ee602 | 4484 | int md_run(mddev_t *mddev) |
1da177e4 | 4485 | { |
2604b703 | 4486 | int err; |
1da177e4 | 4487 | mdk_rdev_t *rdev; |
2604b703 | 4488 | struct mdk_personality *pers; |
1da177e4 | 4489 | |
a757e64c N |
4490 | if (list_empty(&mddev->disks)) |
4491 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4492 | return -EINVAL; |
1da177e4 LT |
4493 | |
4494 | if (mddev->pers) | |
4495 | return -EBUSY; | |
bb4f1e9d N |
4496 | /* Cannot run until previous stop completes properly */ |
4497 | if (mddev->sysfs_active) | |
4498 | return -EBUSY; | |
b6eb127d | 4499 | |
1da177e4 LT |
4500 | /* |
4501 | * Analyze all RAID superblock(s) | |
4502 | */ | |
1ec4a939 N |
4503 | if (!mddev->raid_disks) { |
4504 | if (!mddev->persistent) | |
4505 | return -EINVAL; | |
a757e64c | 4506 | analyze_sbs(mddev); |
1ec4a939 | 4507 | } |
1da177e4 | 4508 | |
d9d166c2 N |
4509 | if (mddev->level != LEVEL_NONE) |
4510 | request_module("md-level-%d", mddev->level); | |
4511 | else if (mddev->clevel[0]) | |
4512 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4513 | |
4514 | /* | |
4515 | * Drop all container device buffers, from now on | |
4516 | * the only valid external interface is through the md | |
4517 | * device. | |
1da177e4 | 4518 | */ |
159ec1fc | 4519 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4520 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4521 | continue; |
4522 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4523 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4524 | |
4525 | /* perform some consistency tests on the device. | |
4526 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4527 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4528 | */ |
a6ff7e08 JB |
4529 | if (rdev->meta_bdev) { |
4530 | /* Nothing to check */; | |
4531 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4532 | if (mddev->dev_sectors && |
4533 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4534 | > rdev->sb_start) { |
f0d76d70 N |
4535 | printk("md: %s: data overlaps metadata\n", |
4536 | mdname(mddev)); | |
4537 | return -EINVAL; | |
4538 | } | |
4539 | } else { | |
0f420358 | 4540 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4541 | > rdev->data_offset) { |
4542 | printk("md: %s: metadata overlaps data\n", | |
4543 | mdname(mddev)); | |
4544 | return -EINVAL; | |
4545 | } | |
4546 | } | |
00bcb4ac | 4547 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4548 | } |
4549 | ||
a167f663 | 4550 | if (mddev->bio_set == NULL) |
a519b26d N |
4551 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, |
4552 | sizeof(mddev_t *)); | |
a167f663 | 4553 | |
1da177e4 | 4554 | spin_lock(&pers_lock); |
d9d166c2 | 4555 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4556 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4557 | spin_unlock(&pers_lock); |
d9d166c2 N |
4558 | if (mddev->level != LEVEL_NONE) |
4559 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4560 | mddev->level); | |
4561 | else | |
4562 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4563 | mddev->clevel); | |
1da177e4 LT |
4564 | return -EINVAL; |
4565 | } | |
2604b703 | 4566 | mddev->pers = pers; |
1da177e4 | 4567 | spin_unlock(&pers_lock); |
34817e8c N |
4568 | if (mddev->level != pers->level) { |
4569 | mddev->level = pers->level; | |
4570 | mddev->new_level = pers->level; | |
4571 | } | |
d9d166c2 | 4572 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4573 | |
f6705578 | 4574 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4575 | pers->start_reshape == NULL) { |
f6705578 N |
4576 | /* This personality cannot handle reshaping... */ |
4577 | mddev->pers = NULL; | |
4578 | module_put(pers->owner); | |
4579 | return -EINVAL; | |
4580 | } | |
4581 | ||
7dd5e7c3 N |
4582 | if (pers->sync_request) { |
4583 | /* Warn if this is a potentially silly | |
4584 | * configuration. | |
4585 | */ | |
4586 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4587 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4588 | int warned = 0; |
159ec1fc CR |
4589 | |
4590 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4591 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4592 | if (rdev < rdev2 && |
4593 | rdev->bdev->bd_contains == | |
4594 | rdev2->bdev->bd_contains) { | |
4595 | printk(KERN_WARNING | |
4596 | "%s: WARNING: %s appears to be" | |
4597 | " on the same physical disk as" | |
4598 | " %s.\n", | |
4599 | mdname(mddev), | |
4600 | bdevname(rdev->bdev,b), | |
4601 | bdevname(rdev2->bdev,b2)); | |
4602 | warned = 1; | |
4603 | } | |
4604 | } | |
159ec1fc | 4605 | |
7dd5e7c3 N |
4606 | if (warned) |
4607 | printk(KERN_WARNING | |
4608 | "True protection against single-disk" | |
4609 | " failure might be compromised.\n"); | |
4610 | } | |
4611 | ||
657390d2 | 4612 | mddev->recovery = 0; |
58c0fed4 AN |
4613 | /* may be over-ridden by personality */ |
4614 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4615 | ||
6ff8d8ec | 4616 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4617 | |
0f9552b5 | 4618 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4619 | mddev->ro = 2; /* read-only, but switch on first write */ |
4620 | ||
b15c2e57 | 4621 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4622 | if (err) |
4623 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4624 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4625 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4626 | " but 'external_size' not in effect?\n", __func__); | |
4627 | printk(KERN_ERR | |
4628 | "md: invalid array_size %llu > default size %llu\n", | |
4629 | (unsigned long long)mddev->array_sectors / 2, | |
4630 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4631 | err = -EINVAL; | |
4632 | mddev->pers->stop(mddev); | |
4633 | } | |
4634 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4635 | err = bitmap_create(mddev); |
4636 | if (err) { | |
4637 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4638 | mdname(mddev), err); | |
4639 | mddev->pers->stop(mddev); | |
4640 | } | |
4641 | } | |
1da177e4 | 4642 | if (err) { |
1da177e4 LT |
4643 | module_put(mddev->pers->owner); |
4644 | mddev->pers = NULL; | |
32a7627c N |
4645 | bitmap_destroy(mddev); |
4646 | return err; | |
1da177e4 | 4647 | } |
5e55e2f5 | 4648 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4649 | if (mddev->kobj.sd && |
4650 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4651 | printk(KERN_WARNING |
4652 | "md: cannot register extra attributes for %s\n", | |
4653 | mdname(mddev)); | |
00bcb4ac | 4654 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4655 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4656 | mddev->ro = 0; |
4657 | ||
1da177e4 | 4658 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4659 | atomic_set(&mddev->max_corr_read_errors, |
4660 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4661 | mddev->safemode = 0; |
4662 | mddev->safemode_timer.function = md_safemode_timeout; | |
4663 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4664 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4665 | mddev->in_sync = 1; |
0ca69886 N |
4666 | smp_wmb(); |
4667 | mddev->ready = 1; | |
159ec1fc | 4668 | list_for_each_entry(rdev, &mddev->disks, same_set) |
36fad858 NK |
4669 | if (rdev->raid_disk >= 0) |
4670 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 4671 | /* failure here is OK */; |
1da177e4 LT |
4672 | |
4673 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4674 | ||
850b2b42 N |
4675 | if (mddev->flags) |
4676 | md_update_sb(mddev, 0); | |
1da177e4 | 4677 | |
d7603b7e | 4678 | md_new_event(mddev); |
00bcb4ac N |
4679 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4680 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4681 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4682 | return 0; |
4683 | } | |
390ee602 | 4684 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4685 | |
fe60b014 N |
4686 | static int do_md_run(mddev_t *mddev) |
4687 | { | |
4688 | int err; | |
4689 | ||
4690 | err = md_run(mddev); | |
4691 | if (err) | |
4692 | goto out; | |
69e51b44 N |
4693 | err = bitmap_load(mddev); |
4694 | if (err) { | |
4695 | bitmap_destroy(mddev); | |
4696 | goto out; | |
4697 | } | |
0fd018af JB |
4698 | |
4699 | md_wakeup_thread(mddev->thread); | |
4700 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
4701 | ||
fe60b014 N |
4702 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4703 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 4704 | mddev->changed = 1; |
fe60b014 N |
4705 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
4706 | out: | |
4707 | return err; | |
4708 | } | |
4709 | ||
1da177e4 LT |
4710 | static int restart_array(mddev_t *mddev) |
4711 | { | |
4712 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4713 | |
80fab1d7 | 4714 | /* Complain if it has no devices */ |
1da177e4 | 4715 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4716 | return -ENXIO; |
4717 | if (!mddev->pers) | |
4718 | return -EINVAL; | |
4719 | if (!mddev->ro) | |
4720 | return -EBUSY; | |
4721 | mddev->safemode = 0; | |
4722 | mddev->ro = 0; | |
4723 | set_disk_ro(disk, 0); | |
4724 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4725 | mdname(mddev)); | |
4726 | /* Kick recovery or resync if necessary */ | |
4727 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4728 | md_wakeup_thread(mddev->thread); | |
4729 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 4730 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 4731 | return 0; |
1da177e4 LT |
4732 | } |
4733 | ||
acc55e22 N |
4734 | /* similar to deny_write_access, but accounts for our holding a reference |
4735 | * to the file ourselves */ | |
4736 | static int deny_bitmap_write_access(struct file * file) | |
4737 | { | |
4738 | struct inode *inode = file->f_mapping->host; | |
4739 | ||
4740 | spin_lock(&inode->i_lock); | |
4741 | if (atomic_read(&inode->i_writecount) > 1) { | |
4742 | spin_unlock(&inode->i_lock); | |
4743 | return -ETXTBSY; | |
4744 | } | |
4745 | atomic_set(&inode->i_writecount, -1); | |
4746 | spin_unlock(&inode->i_lock); | |
4747 | ||
4748 | return 0; | |
4749 | } | |
4750 | ||
43a70507 | 4751 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4752 | { |
4753 | struct inode *inode = file->f_mapping->host; | |
4754 | ||
4755 | spin_lock(&inode->i_lock); | |
4756 | atomic_set(&inode->i_writecount, 1); | |
4757 | spin_unlock(&inode->i_lock); | |
4758 | } | |
4759 | ||
6177b472 N |
4760 | static void md_clean(mddev_t *mddev) |
4761 | { | |
4762 | mddev->array_sectors = 0; | |
4763 | mddev->external_size = 0; | |
4764 | mddev->dev_sectors = 0; | |
4765 | mddev->raid_disks = 0; | |
4766 | mddev->recovery_cp = 0; | |
4767 | mddev->resync_min = 0; | |
4768 | mddev->resync_max = MaxSector; | |
4769 | mddev->reshape_position = MaxSector; | |
4770 | mddev->external = 0; | |
4771 | mddev->persistent = 0; | |
4772 | mddev->level = LEVEL_NONE; | |
4773 | mddev->clevel[0] = 0; | |
4774 | mddev->flags = 0; | |
4775 | mddev->ro = 0; | |
4776 | mddev->metadata_type[0] = 0; | |
4777 | mddev->chunk_sectors = 0; | |
4778 | mddev->ctime = mddev->utime = 0; | |
4779 | mddev->layout = 0; | |
4780 | mddev->max_disks = 0; | |
4781 | mddev->events = 0; | |
a8707c08 | 4782 | mddev->can_decrease_events = 0; |
6177b472 N |
4783 | mddev->delta_disks = 0; |
4784 | mddev->new_level = LEVEL_NONE; | |
4785 | mddev->new_layout = 0; | |
4786 | mddev->new_chunk_sectors = 0; | |
4787 | mddev->curr_resync = 0; | |
4788 | mddev->resync_mismatches = 0; | |
4789 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4790 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4791 | mddev->recovery = 0; | |
4792 | mddev->in_sync = 0; | |
f0b4f7e2 | 4793 | mddev->changed = 0; |
6177b472 | 4794 | mddev->degraded = 0; |
6177b472 N |
4795 | mddev->safemode = 0; |
4796 | mddev->bitmap_info.offset = 0; | |
4797 | mddev->bitmap_info.default_offset = 0; | |
4798 | mddev->bitmap_info.chunksize = 0; | |
4799 | mddev->bitmap_info.daemon_sleep = 0; | |
4800 | mddev->bitmap_info.max_write_behind = 0; | |
4801 | } | |
4802 | ||
defad61a | 4803 | static void __md_stop_writes(mddev_t *mddev) |
a047e125 N |
4804 | { |
4805 | if (mddev->sync_thread) { | |
4806 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4807 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 4808 | reap_sync_thread(mddev); |
a047e125 N |
4809 | } |
4810 | ||
4811 | del_timer_sync(&mddev->safemode_timer); | |
4812 | ||
4813 | bitmap_flush(mddev); | |
4814 | md_super_wait(mddev); | |
4815 | ||
4816 | if (!mddev->in_sync || mddev->flags) { | |
4817 | /* mark array as shutdown cleanly */ | |
4818 | mddev->in_sync = 1; | |
4819 | md_update_sb(mddev, 1); | |
4820 | } | |
4821 | } | |
defad61a N |
4822 | |
4823 | void md_stop_writes(mddev_t *mddev) | |
4824 | { | |
4825 | mddev_lock(mddev); | |
4826 | __md_stop_writes(mddev); | |
4827 | mddev_unlock(mddev); | |
4828 | } | |
390ee602 | 4829 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 4830 | |
390ee602 | 4831 | void md_stop(mddev_t *mddev) |
6177b472 | 4832 | { |
0ca69886 | 4833 | mddev->ready = 0; |
6177b472 N |
4834 | mddev->pers->stop(mddev); |
4835 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
4836 | mddev->to_remove = &md_redundancy_group; | |
4837 | module_put(mddev->pers->owner); | |
4838 | mddev->pers = NULL; | |
cca9cf90 | 4839 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 4840 | } |
390ee602 | 4841 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 4842 | |
a4bd82d0 N |
4843 | static int md_set_readonly(mddev_t *mddev, int is_open) |
4844 | { | |
4845 | int err = 0; | |
4846 | mutex_lock(&mddev->open_mutex); | |
4847 | if (atomic_read(&mddev->openers) > is_open) { | |
4848 | printk("md: %s still in use.\n",mdname(mddev)); | |
4849 | err = -EBUSY; | |
4850 | goto out; | |
4851 | } | |
4852 | if (mddev->pers) { | |
defad61a | 4853 | __md_stop_writes(mddev); |
a4bd82d0 N |
4854 | |
4855 | err = -ENXIO; | |
4856 | if (mddev->ro==1) | |
4857 | goto out; | |
4858 | mddev->ro = 1; | |
4859 | set_disk_ro(mddev->gendisk, 1); | |
4860 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 4861 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
4862 | err = 0; |
4863 | } | |
4864 | out: | |
4865 | mutex_unlock(&mddev->open_mutex); | |
4866 | return err; | |
4867 | } | |
4868 | ||
9e653b63 N |
4869 | /* mode: |
4870 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
4871 | * 2 - stop but do not disassemble array |
4872 | */ | |
df5b20cf | 4873 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 | 4874 | { |
1da177e4 | 4875 | struct gendisk *disk = mddev->gendisk; |
c4647292 | 4876 | mdk_rdev_t *rdev; |
1da177e4 | 4877 | |
c8c00a69 | 4878 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
4879 | if (atomic_read(&mddev->openers) > is_open || |
4880 | mddev->sysfs_active) { | |
df5b20cf | 4881 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
4882 | mutex_unlock(&mddev->open_mutex); |
4883 | return -EBUSY; | |
4884 | } | |
1da177e4 | 4885 | |
6e17b027 | 4886 | if (mddev->pers) { |
a4bd82d0 N |
4887 | if (mddev->ro) |
4888 | set_disk_ro(disk, 0); | |
409c57f3 | 4889 | |
defad61a | 4890 | __md_stop_writes(mddev); |
a4bd82d0 N |
4891 | md_stop(mddev); |
4892 | mddev->queue->merge_bvec_fn = NULL; | |
a4bd82d0 | 4893 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 4894 | |
a4bd82d0 | 4895 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 4896 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 4897 | |
a4bd82d0 | 4898 | list_for_each_entry(rdev, &mddev->disks, same_set) |
36fad858 NK |
4899 | if (rdev->raid_disk >= 0) |
4900 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 4901 | |
a4bd82d0 | 4902 | set_capacity(disk, 0); |
6e17b027 | 4903 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 4904 | mddev->changed = 1; |
a4bd82d0 | 4905 | revalidate_disk(disk); |
0d4ca600 | 4906 | |
a4bd82d0 N |
4907 | if (mddev->ro) |
4908 | mddev->ro = 0; | |
6e17b027 N |
4909 | } else |
4910 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
4911 | /* |
4912 | * Free resources if final stop | |
4913 | */ | |
9e653b63 | 4914 | if (mode == 0) { |
1da177e4 LT |
4915 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4916 | ||
978f946b | 4917 | bitmap_destroy(mddev); |
c3d9714e N |
4918 | if (mddev->bitmap_info.file) { |
4919 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
4920 | fput(mddev->bitmap_info.file); | |
4921 | mddev->bitmap_info.file = NULL; | |
978f946b | 4922 | } |
c3d9714e | 4923 | mddev->bitmap_info.offset = 0; |
978f946b | 4924 | |
1da177e4 LT |
4925 | export_array(mddev); |
4926 | ||
6177b472 | 4927 | md_clean(mddev); |
934d9c23 | 4928 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4929 | if (mddev->hold_active == UNTIL_STOP) |
4930 | mddev->hold_active = 0; | |
a4bd82d0 | 4931 | } |
3f9d99c1 | 4932 | blk_integrity_unregister(disk); |
d7603b7e | 4933 | md_new_event(mddev); |
00bcb4ac | 4934 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 4935 | return 0; |
1da177e4 LT |
4936 | } |
4937 | ||
fdee8ae4 | 4938 | #ifndef MODULE |
1da177e4 LT |
4939 | static void autorun_array(mddev_t *mddev) |
4940 | { | |
4941 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4942 | int err; |
4943 | ||
a757e64c | 4944 | if (list_empty(&mddev->disks)) |
1da177e4 | 4945 | return; |
1da177e4 LT |
4946 | |
4947 | printk(KERN_INFO "md: running: "); | |
4948 | ||
159ec1fc | 4949 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4950 | char b[BDEVNAME_SIZE]; |
4951 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4952 | } | |
4953 | printk("\n"); | |
4954 | ||
d710e138 | 4955 | err = do_md_run(mddev); |
1da177e4 LT |
4956 | if (err) { |
4957 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4958 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4959 | } |
4960 | } | |
4961 | ||
4962 | /* | |
4963 | * lets try to run arrays based on all disks that have arrived | |
4964 | * until now. (those are in pending_raid_disks) | |
4965 | * | |
4966 | * the method: pick the first pending disk, collect all disks with | |
4967 | * the same UUID, remove all from the pending list and put them into | |
4968 | * the 'same_array' list. Then order this list based on superblock | |
4969 | * update time (freshest comes first), kick out 'old' disks and | |
4970 | * compare superblocks. If everything's fine then run it. | |
4971 | * | |
4972 | * If "unit" is allocated, then bump its reference count | |
4973 | */ | |
4974 | static void autorun_devices(int part) | |
4975 | { | |
159ec1fc | 4976 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4977 | mddev_t *mddev; |
4978 | char b[BDEVNAME_SIZE]; | |
4979 | ||
4980 | printk(KERN_INFO "md: autorun ...\n"); | |
4981 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4982 | int unit; |
1da177e4 | 4983 | dev_t dev; |
ad01c9e3 | 4984 | LIST_HEAD(candidates); |
1da177e4 LT |
4985 | rdev0 = list_entry(pending_raid_disks.next, |
4986 | mdk_rdev_t, same_set); | |
4987 | ||
4988 | printk(KERN_INFO "md: considering %s ...\n", | |
4989 | bdevname(rdev0->bdev,b)); | |
4990 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4991 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4992 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4993 | printk(KERN_INFO "md: adding %s ...\n", | |
4994 | bdevname(rdev->bdev,b)); | |
4995 | list_move(&rdev->same_set, &candidates); | |
4996 | } | |
4997 | /* | |
4998 | * now we have a set of devices, with all of them having | |
4999 | * mostly sane superblocks. It's time to allocate the | |
5000 | * mddev. | |
5001 | */ | |
e8703fe1 N |
5002 | if (part) { |
5003 | dev = MKDEV(mdp_major, | |
5004 | rdev0->preferred_minor << MdpMinorShift); | |
5005 | unit = MINOR(dev) >> MdpMinorShift; | |
5006 | } else { | |
5007 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5008 | unit = MINOR(dev); | |
5009 | } | |
5010 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5011 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5012 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5013 | break; | |
5014 | } | |
1da177e4 LT |
5015 | |
5016 | md_probe(dev, NULL, NULL); | |
5017 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5018 | if (!mddev || !mddev->gendisk) { |
5019 | if (mddev) | |
5020 | mddev_put(mddev); | |
5021 | printk(KERN_ERR | |
1da177e4 LT |
5022 | "md: cannot allocate memory for md drive.\n"); |
5023 | break; | |
5024 | } | |
5025 | if (mddev_lock(mddev)) | |
5026 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
5027 | mdname(mddev)); | |
5028 | else if (mddev->raid_disks || mddev->major_version | |
5029 | || !list_empty(&mddev->disks)) { | |
5030 | printk(KERN_WARNING | |
5031 | "md: %s already running, cannot run %s\n", | |
5032 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5033 | mddev_unlock(mddev); | |
5034 | } else { | |
5035 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5036 | mddev->persistent = 1; |
159ec1fc | 5037 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5038 | list_del_init(&rdev->same_set); |
5039 | if (bind_rdev_to_array(rdev, mddev)) | |
5040 | export_rdev(rdev); | |
5041 | } | |
5042 | autorun_array(mddev); | |
5043 | mddev_unlock(mddev); | |
5044 | } | |
5045 | /* on success, candidates will be empty, on error | |
5046 | * it won't... | |
5047 | */ | |
159ec1fc | 5048 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5049 | list_del_init(&rdev->same_set); |
1da177e4 | 5050 | export_rdev(rdev); |
4b80991c | 5051 | } |
1da177e4 LT |
5052 | mddev_put(mddev); |
5053 | } | |
5054 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5055 | } | |
fdee8ae4 | 5056 | #endif /* !MODULE */ |
1da177e4 | 5057 | |
1da177e4 LT |
5058 | static int get_version(void __user * arg) |
5059 | { | |
5060 | mdu_version_t ver; | |
5061 | ||
5062 | ver.major = MD_MAJOR_VERSION; | |
5063 | ver.minor = MD_MINOR_VERSION; | |
5064 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5065 | ||
5066 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5067 | return -EFAULT; | |
5068 | ||
5069 | return 0; | |
5070 | } | |
5071 | ||
5072 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
5073 | { | |
5074 | mdu_array_info_t info; | |
a9f326eb | 5075 | int nr,working,insync,failed,spare; |
1da177e4 | 5076 | mdk_rdev_t *rdev; |
1da177e4 | 5077 | |
a9f326eb | 5078 | nr=working=insync=failed=spare=0; |
159ec1fc | 5079 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 5080 | nr++; |
b2d444d7 | 5081 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5082 | failed++; |
5083 | else { | |
5084 | working++; | |
b2d444d7 | 5085 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 5086 | insync++; |
1da177e4 LT |
5087 | else |
5088 | spare++; | |
5089 | } | |
5090 | } | |
5091 | ||
5092 | info.major_version = mddev->major_version; | |
5093 | info.minor_version = mddev->minor_version; | |
5094 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5095 | info.ctime = mddev->ctime; | |
5096 | info.level = mddev->level; | |
58c0fed4 AN |
5097 | info.size = mddev->dev_sectors / 2; |
5098 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5099 | info.size = -1; |
1da177e4 LT |
5100 | info.nr_disks = nr; |
5101 | info.raid_disks = mddev->raid_disks; | |
5102 | info.md_minor = mddev->md_minor; | |
5103 | info.not_persistent= !mddev->persistent; | |
5104 | ||
5105 | info.utime = mddev->utime; | |
5106 | info.state = 0; | |
5107 | if (mddev->in_sync) | |
5108 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5109 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5110 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5111 | info.active_disks = insync; |
1da177e4 LT |
5112 | info.working_disks = working; |
5113 | info.failed_disks = failed; | |
5114 | info.spare_disks = spare; | |
5115 | ||
5116 | info.layout = mddev->layout; | |
9d8f0363 | 5117 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5118 | |
5119 | if (copy_to_user(arg, &info, sizeof(info))) | |
5120 | return -EFAULT; | |
5121 | ||
5122 | return 0; | |
5123 | } | |
5124 | ||
87162a28 | 5125 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
5126 | { |
5127 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5128 | char *ptr, *buf = NULL; | |
5129 | int err = -ENOMEM; | |
5130 | ||
b5470dc5 DW |
5131 | if (md_allow_write(mddev)) |
5132 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5133 | else | |
5134 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5135 | |
32a7627c N |
5136 | if (!file) |
5137 | goto out; | |
5138 | ||
5139 | /* bitmap disabled, zero the first byte and copy out */ | |
5140 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
5141 | file->pathname[0] = '\0'; | |
5142 | goto copy_out; | |
5143 | } | |
5144 | ||
5145 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5146 | if (!buf) | |
5147 | goto out; | |
5148 | ||
6bcfd601 CH |
5149 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
5150 | if (IS_ERR(ptr)) | |
32a7627c N |
5151 | goto out; |
5152 | ||
5153 | strcpy(file->pathname, ptr); | |
5154 | ||
5155 | copy_out: | |
5156 | err = 0; | |
5157 | if (copy_to_user(arg, file, sizeof(*file))) | |
5158 | err = -EFAULT; | |
5159 | out: | |
5160 | kfree(buf); | |
5161 | kfree(file); | |
5162 | return err; | |
5163 | } | |
5164 | ||
1da177e4 LT |
5165 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
5166 | { | |
5167 | mdu_disk_info_t info; | |
1da177e4 LT |
5168 | mdk_rdev_t *rdev; |
5169 | ||
5170 | if (copy_from_user(&info, arg, sizeof(info))) | |
5171 | return -EFAULT; | |
5172 | ||
26ef379f | 5173 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5174 | if (rdev) { |
5175 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5176 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5177 | info.raid_disk = rdev->raid_disk; | |
5178 | info.state = 0; | |
b2d444d7 | 5179 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5180 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5181 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5182 | info.state |= (1<<MD_DISK_ACTIVE); |
5183 | info.state |= (1<<MD_DISK_SYNC); | |
5184 | } | |
8ddf9efe N |
5185 | if (test_bit(WriteMostly, &rdev->flags)) |
5186 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5187 | } else { |
5188 | info.major = info.minor = 0; | |
5189 | info.raid_disk = -1; | |
5190 | info.state = (1<<MD_DISK_REMOVED); | |
5191 | } | |
5192 | ||
5193 | if (copy_to_user(arg, &info, sizeof(info))) | |
5194 | return -EFAULT; | |
5195 | ||
5196 | return 0; | |
5197 | } | |
5198 | ||
5199 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
5200 | { | |
5201 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
5202 | mdk_rdev_t *rdev; | |
5203 | dev_t dev = MKDEV(info->major,info->minor); | |
5204 | ||
5205 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5206 | return -EOVERFLOW; | |
5207 | ||
5208 | if (!mddev->raid_disks) { | |
5209 | int err; | |
5210 | /* expecting a device which has a superblock */ | |
5211 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5212 | if (IS_ERR(rdev)) { | |
5213 | printk(KERN_WARNING | |
5214 | "md: md_import_device returned %ld\n", | |
5215 | PTR_ERR(rdev)); | |
5216 | return PTR_ERR(rdev); | |
5217 | } | |
5218 | if (!list_empty(&mddev->disks)) { | |
5219 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
5220 | mdk_rdev_t, same_set); | |
a9f326eb | 5221 | err = super_types[mddev->major_version] |
1da177e4 LT |
5222 | .load_super(rdev, rdev0, mddev->minor_version); |
5223 | if (err < 0) { | |
5224 | printk(KERN_WARNING | |
5225 | "md: %s has different UUID to %s\n", | |
5226 | bdevname(rdev->bdev,b), | |
5227 | bdevname(rdev0->bdev,b2)); | |
5228 | export_rdev(rdev); | |
5229 | return -EINVAL; | |
5230 | } | |
5231 | } | |
5232 | err = bind_rdev_to_array(rdev, mddev); | |
5233 | if (err) | |
5234 | export_rdev(rdev); | |
5235 | return err; | |
5236 | } | |
5237 | ||
5238 | /* | |
5239 | * add_new_disk can be used once the array is assembled | |
5240 | * to add "hot spares". They must already have a superblock | |
5241 | * written | |
5242 | */ | |
5243 | if (mddev->pers) { | |
5244 | int err; | |
5245 | if (!mddev->pers->hot_add_disk) { | |
5246 | printk(KERN_WARNING | |
5247 | "%s: personality does not support diskops!\n", | |
5248 | mdname(mddev)); | |
5249 | return -EINVAL; | |
5250 | } | |
7b1e35f6 N |
5251 | if (mddev->persistent) |
5252 | rdev = md_import_device(dev, mddev->major_version, | |
5253 | mddev->minor_version); | |
5254 | else | |
5255 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5256 | if (IS_ERR(rdev)) { |
5257 | printk(KERN_WARNING | |
5258 | "md: md_import_device returned %ld\n", | |
5259 | PTR_ERR(rdev)); | |
5260 | return PTR_ERR(rdev); | |
5261 | } | |
1a855a06 | 5262 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5263 | if (!mddev->persistent) { |
5264 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5265 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5266 | rdev->raid_disk = info->raid_disk; |
bf572541 N |
5267 | set_bit(In_sync, &rdev->flags); |
5268 | } else | |
41158c7e N |
5269 | rdev->raid_disk = -1; |
5270 | } else | |
5271 | super_types[mddev->major_version]. | |
5272 | validate_super(mddev, rdev); | |
bedd86b7 N |
5273 | if ((info->state & (1<<MD_DISK_SYNC)) && |
5274 | (!test_bit(In_sync, &rdev->flags) || | |
5275 | rdev->raid_disk != info->raid_disk)) { | |
5276 | /* This was a hot-add request, but events doesn't | |
5277 | * match, so reject it. | |
5278 | */ | |
5279 | export_rdev(rdev); | |
5280 | return -EINVAL; | |
5281 | } | |
5282 | ||
1a855a06 N |
5283 | if (test_bit(In_sync, &rdev->flags)) |
5284 | rdev->saved_raid_disk = rdev->raid_disk; | |
5285 | else | |
5286 | rdev->saved_raid_disk = -1; | |
41158c7e | 5287 | |
b2d444d7 | 5288 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5289 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5290 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5291 | else |
5292 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5293 | |
1da177e4 LT |
5294 | rdev->raid_disk = -1; |
5295 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5296 | if (!err && !mddev->pers->hot_remove_disk) { |
5297 | /* If there is hot_add_disk but no hot_remove_disk | |
5298 | * then added disks for geometry changes, | |
5299 | * and should be added immediately. | |
5300 | */ | |
5301 | super_types[mddev->major_version]. | |
5302 | validate_super(mddev, rdev); | |
5303 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5304 | if (err) | |
5305 | unbind_rdev_from_array(rdev); | |
5306 | } | |
1da177e4 LT |
5307 | if (err) |
5308 | export_rdev(rdev); | |
52664732 | 5309 | else |
00bcb4ac | 5310 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5311 | |
17571284 | 5312 | md_update_sb(mddev, 1); |
72a23c21 NB |
5313 | if (mddev->degraded) |
5314 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5315 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5316 | if (!err) |
5317 | md_new_event(mddev); | |
005eca5e | 5318 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5319 | return err; |
5320 | } | |
5321 | ||
5322 | /* otherwise, add_new_disk is only allowed | |
5323 | * for major_version==0 superblocks | |
5324 | */ | |
5325 | if (mddev->major_version != 0) { | |
5326 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5327 | mdname(mddev)); | |
5328 | return -EINVAL; | |
5329 | } | |
5330 | ||
5331 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5332 | int err; | |
d710e138 | 5333 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5334 | if (IS_ERR(rdev)) { |
5335 | printk(KERN_WARNING | |
5336 | "md: error, md_import_device() returned %ld\n", | |
5337 | PTR_ERR(rdev)); | |
5338 | return PTR_ERR(rdev); | |
5339 | } | |
5340 | rdev->desc_nr = info->number; | |
5341 | if (info->raid_disk < mddev->raid_disks) | |
5342 | rdev->raid_disk = info->raid_disk; | |
5343 | else | |
5344 | rdev->raid_disk = -1; | |
5345 | ||
1da177e4 | 5346 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5347 | if (info->state & (1<<MD_DISK_SYNC)) |
5348 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5349 | |
8ddf9efe N |
5350 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5351 | set_bit(WriteMostly, &rdev->flags); | |
5352 | ||
1da177e4 LT |
5353 | if (!mddev->persistent) { |
5354 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5355 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5356 | } else | |
57b2caa3 | 5357 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5358 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5359 | |
2bf071bf N |
5360 | err = bind_rdev_to_array(rdev, mddev); |
5361 | if (err) { | |
5362 | export_rdev(rdev); | |
5363 | return err; | |
5364 | } | |
1da177e4 LT |
5365 | } |
5366 | ||
5367 | return 0; | |
5368 | } | |
5369 | ||
5370 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5371 | { | |
5372 | char b[BDEVNAME_SIZE]; | |
5373 | mdk_rdev_t *rdev; | |
5374 | ||
1da177e4 LT |
5375 | rdev = find_rdev(mddev, dev); |
5376 | if (!rdev) | |
5377 | return -ENXIO; | |
5378 | ||
5379 | if (rdev->raid_disk >= 0) | |
5380 | goto busy; | |
5381 | ||
5382 | kick_rdev_from_array(rdev); | |
850b2b42 | 5383 | md_update_sb(mddev, 1); |
d7603b7e | 5384 | md_new_event(mddev); |
1da177e4 LT |
5385 | |
5386 | return 0; | |
5387 | busy: | |
fdefa4d8 | 5388 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5389 | bdevname(rdev->bdev,b), mdname(mddev)); |
5390 | return -EBUSY; | |
5391 | } | |
5392 | ||
5393 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5394 | { | |
5395 | char b[BDEVNAME_SIZE]; | |
5396 | int err; | |
1da177e4 LT |
5397 | mdk_rdev_t *rdev; |
5398 | ||
5399 | if (!mddev->pers) | |
5400 | return -ENODEV; | |
5401 | ||
5402 | if (mddev->major_version != 0) { | |
5403 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5404 | " version-0 superblocks.\n", | |
5405 | mdname(mddev)); | |
5406 | return -EINVAL; | |
5407 | } | |
5408 | if (!mddev->pers->hot_add_disk) { | |
5409 | printk(KERN_WARNING | |
5410 | "%s: personality does not support diskops!\n", | |
5411 | mdname(mddev)); | |
5412 | return -EINVAL; | |
5413 | } | |
5414 | ||
d710e138 | 5415 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5416 | if (IS_ERR(rdev)) { |
5417 | printk(KERN_WARNING | |
5418 | "md: error, md_import_device() returned %ld\n", | |
5419 | PTR_ERR(rdev)); | |
5420 | return -EINVAL; | |
5421 | } | |
5422 | ||
5423 | if (mddev->persistent) | |
57b2caa3 | 5424 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5425 | else |
77304d2a | 5426 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5427 | |
8190e754 | 5428 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5429 | |
b2d444d7 | 5430 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5431 | printk(KERN_WARNING |
5432 | "md: can not hot-add faulty %s disk to %s!\n", | |
5433 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5434 | err = -EINVAL; | |
5435 | goto abort_export; | |
5436 | } | |
b2d444d7 | 5437 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5438 | rdev->desc_nr = -1; |
5842730d | 5439 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5440 | err = bind_rdev_to_array(rdev, mddev); |
5441 | if (err) | |
5442 | goto abort_export; | |
1da177e4 LT |
5443 | |
5444 | /* | |
5445 | * The rest should better be atomic, we can have disk failures | |
5446 | * noticed in interrupt contexts ... | |
5447 | */ | |
5448 | ||
1da177e4 LT |
5449 | rdev->raid_disk = -1; |
5450 | ||
850b2b42 | 5451 | md_update_sb(mddev, 1); |
1da177e4 LT |
5452 | |
5453 | /* | |
5454 | * Kick recovery, maybe this spare has to be added to the | |
5455 | * array immediately. | |
5456 | */ | |
5457 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5458 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5459 | md_new_event(mddev); |
1da177e4 LT |
5460 | return 0; |
5461 | ||
1da177e4 LT |
5462 | abort_export: |
5463 | export_rdev(rdev); | |
5464 | return err; | |
5465 | } | |
5466 | ||
32a7627c N |
5467 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5468 | { | |
5469 | int err; | |
5470 | ||
36fa3063 N |
5471 | if (mddev->pers) { |
5472 | if (!mddev->pers->quiesce) | |
5473 | return -EBUSY; | |
5474 | if (mddev->recovery || mddev->sync_thread) | |
5475 | return -EBUSY; | |
5476 | /* we should be able to change the bitmap.. */ | |
5477 | } | |
32a7627c | 5478 | |
32a7627c | 5479 | |
36fa3063 N |
5480 | if (fd >= 0) { |
5481 | if (mddev->bitmap) | |
5482 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5483 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5484 | |
c3d9714e | 5485 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5486 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5487 | mdname(mddev)); | |
5488 | return -EBADF; | |
5489 | } | |
5490 | ||
c3d9714e | 5491 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5492 | if (err) { |
5493 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5494 | mdname(mddev)); | |
c3d9714e N |
5495 | fput(mddev->bitmap_info.file); |
5496 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5497 | return err; |
5498 | } | |
c3d9714e | 5499 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5500 | } else if (mddev->bitmap == NULL) |
5501 | return -ENOENT; /* cannot remove what isn't there */ | |
5502 | err = 0; | |
5503 | if (mddev->pers) { | |
5504 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5505 | if (fd >= 0) { |
36fa3063 | 5506 | err = bitmap_create(mddev); |
69e51b44 N |
5507 | if (!err) |
5508 | err = bitmap_load(mddev); | |
5509 | } | |
d7375ab3 | 5510 | if (fd < 0 || err) { |
36fa3063 | 5511 | bitmap_destroy(mddev); |
d7375ab3 N |
5512 | fd = -1; /* make sure to put the file */ |
5513 | } | |
36fa3063 | 5514 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5515 | } |
5516 | if (fd < 0) { | |
c3d9714e N |
5517 | if (mddev->bitmap_info.file) { |
5518 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5519 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5520 | } |
c3d9714e | 5521 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5522 | } |
5523 | ||
32a7627c N |
5524 | return err; |
5525 | } | |
5526 | ||
1da177e4 LT |
5527 | /* |
5528 | * set_array_info is used two different ways | |
5529 | * The original usage is when creating a new array. | |
5530 | * In this usage, raid_disks is > 0 and it together with | |
5531 | * level, size, not_persistent,layout,chunksize determine the | |
5532 | * shape of the array. | |
5533 | * This will always create an array with a type-0.90.0 superblock. | |
5534 | * The newer usage is when assembling an array. | |
5535 | * In this case raid_disks will be 0, and the major_version field is | |
5536 | * use to determine which style super-blocks are to be found on the devices. | |
5537 | * The minor and patch _version numbers are also kept incase the | |
5538 | * super_block handler wishes to interpret them. | |
5539 | */ | |
5540 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5541 | { | |
5542 | ||
5543 | if (info->raid_disks == 0) { | |
5544 | /* just setting version number for superblock loading */ | |
5545 | if (info->major_version < 0 || | |
50511da3 | 5546 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5547 | super_types[info->major_version].name == NULL) { |
5548 | /* maybe try to auto-load a module? */ | |
5549 | printk(KERN_INFO | |
5550 | "md: superblock version %d not known\n", | |
5551 | info->major_version); | |
5552 | return -EINVAL; | |
5553 | } | |
5554 | mddev->major_version = info->major_version; | |
5555 | mddev->minor_version = info->minor_version; | |
5556 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5557 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5558 | /* ensure mddev_put doesn't delete this now that there |
5559 | * is some minimal configuration. | |
5560 | */ | |
5561 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5562 | return 0; |
5563 | } | |
5564 | mddev->major_version = MD_MAJOR_VERSION; | |
5565 | mddev->minor_version = MD_MINOR_VERSION; | |
5566 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5567 | mddev->ctime = get_seconds(); | |
5568 | ||
5569 | mddev->level = info->level; | |
17115e03 | 5570 | mddev->clevel[0] = 0; |
58c0fed4 | 5571 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5572 | mddev->raid_disks = info->raid_disks; |
5573 | /* don't set md_minor, it is determined by which /dev/md* was | |
5574 | * openned | |
5575 | */ | |
5576 | if (info->state & (1<<MD_SB_CLEAN)) | |
5577 | mddev->recovery_cp = MaxSector; | |
5578 | else | |
5579 | mddev->recovery_cp = 0; | |
5580 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5581 | mddev->external = 0; |
1da177e4 LT |
5582 | |
5583 | mddev->layout = info->layout; | |
9d8f0363 | 5584 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5585 | |
5586 | mddev->max_disks = MD_SB_DISKS; | |
5587 | ||
e691063a N |
5588 | if (mddev->persistent) |
5589 | mddev->flags = 0; | |
850b2b42 | 5590 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5591 | |
c3d9714e N |
5592 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5593 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5594 | |
f6705578 N |
5595 | mddev->reshape_position = MaxSector; |
5596 | ||
1da177e4 LT |
5597 | /* |
5598 | * Generate a 128 bit UUID | |
5599 | */ | |
5600 | get_random_bytes(mddev->uuid, 16); | |
5601 | ||
f6705578 | 5602 | mddev->new_level = mddev->level; |
664e7c41 | 5603 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5604 | mddev->new_layout = mddev->layout; |
5605 | mddev->delta_disks = 0; | |
5606 | ||
1da177e4 LT |
5607 | return 0; |
5608 | } | |
5609 | ||
1f403624 DW |
5610 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5611 | { | |
b522adcd DW |
5612 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5613 | ||
5614 | if (mddev->external_size) | |
5615 | return; | |
5616 | ||
1f403624 DW |
5617 | mddev->array_sectors = array_sectors; |
5618 | } | |
5619 | EXPORT_SYMBOL(md_set_array_sectors); | |
5620 | ||
d71f9f88 | 5621 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5622 | { |
159ec1fc | 5623 | mdk_rdev_t *rdev; |
a35b0d69 | 5624 | int rv; |
d71f9f88 | 5625 | int fit = (num_sectors == 0); |
a35b0d69 N |
5626 | |
5627 | if (mddev->pers->resize == NULL) | |
5628 | return -EINVAL; | |
d71f9f88 AN |
5629 | /* The "num_sectors" is the number of sectors of each device that |
5630 | * is used. This can only make sense for arrays with redundancy. | |
5631 | * linear and raid0 always use whatever space is available. We can only | |
5632 | * consider changing this number if no resync or reconstruction is | |
5633 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5634 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5635 | * of each device. If num_sectors is zero, we find the largest size |
5636 | * that fits. | |
a35b0d69 N |
5637 | */ |
5638 | if (mddev->sync_thread) | |
5639 | return -EBUSY; | |
dba034ee N |
5640 | if (mddev->bitmap) |
5641 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5642 | * grow, and re-add. | |
5643 | */ | |
5644 | return -EBUSY; | |
159ec1fc | 5645 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5646 | sector_t avail = rdev->sectors; |
01ab5662 | 5647 | |
d71f9f88 AN |
5648 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5649 | num_sectors = avail; | |
5650 | if (avail < num_sectors) | |
a35b0d69 N |
5651 | return -ENOSPC; |
5652 | } | |
d71f9f88 | 5653 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5654 | if (!rv) |
5655 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5656 | return rv; |
5657 | } | |
5658 | ||
da943b99 N |
5659 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5660 | { | |
5661 | int rv; | |
5662 | /* change the number of raid disks */ | |
63c70c4f | 5663 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5664 | return -EINVAL; |
5665 | if (raid_disks <= 0 || | |
233fca36 | 5666 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5667 | return -EINVAL; |
63c70c4f | 5668 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5669 | return -EBUSY; |
63c70c4f N |
5670 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5671 | ||
5672 | rv = mddev->pers->check_reshape(mddev); | |
de171cb9 N |
5673 | if (rv < 0) |
5674 | mddev->delta_disks = 0; | |
da943b99 N |
5675 | return rv; |
5676 | } | |
5677 | ||
5678 | ||
1da177e4 LT |
5679 | /* |
5680 | * update_array_info is used to change the configuration of an | |
5681 | * on-line array. | |
5682 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5683 | * fields in the info are checked against the array. | |
5684 | * Any differences that cannot be handled will cause an error. | |
5685 | * Normally, only one change can be managed at a time. | |
5686 | */ | |
5687 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5688 | { | |
5689 | int rv = 0; | |
5690 | int cnt = 0; | |
36fa3063 N |
5691 | int state = 0; |
5692 | ||
5693 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5694 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5695 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5696 | |
5697 | if (mddev->major_version != info->major_version || | |
5698 | mddev->minor_version != info->minor_version || | |
5699 | /* mddev->patch_version != info->patch_version || */ | |
5700 | mddev->ctime != info->ctime || | |
5701 | mddev->level != info->level || | |
5702 | /* mddev->layout != info->layout || */ | |
5703 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5704 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5705 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5706 | ((state^info->state) & 0xfffffe00) | |
5707 | ) | |
1da177e4 LT |
5708 | return -EINVAL; |
5709 | /* Check there is only one change */ | |
58c0fed4 AN |
5710 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5711 | cnt++; | |
5712 | if (mddev->raid_disks != info->raid_disks) | |
5713 | cnt++; | |
5714 | if (mddev->layout != info->layout) | |
5715 | cnt++; | |
5716 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5717 | cnt++; | |
5718 | if (cnt == 0) | |
5719 | return 0; | |
5720 | if (cnt > 1) | |
5721 | return -EINVAL; | |
1da177e4 LT |
5722 | |
5723 | if (mddev->layout != info->layout) { | |
5724 | /* Change layout | |
5725 | * we don't need to do anything at the md level, the | |
5726 | * personality will take care of it all. | |
5727 | */ | |
50ac168a | 5728 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5729 | return -EINVAL; |
597a711b N |
5730 | else { |
5731 | mddev->new_layout = info->layout; | |
50ac168a | 5732 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5733 | if (rv) |
5734 | mddev->new_layout = mddev->layout; | |
5735 | return rv; | |
5736 | } | |
1da177e4 | 5737 | } |
58c0fed4 | 5738 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5739 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5740 | |
da943b99 N |
5741 | if (mddev->raid_disks != info->raid_disks) |
5742 | rv = update_raid_disks(mddev, info->raid_disks); | |
5743 | ||
36fa3063 N |
5744 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5745 | if (mddev->pers->quiesce == NULL) | |
5746 | return -EINVAL; | |
5747 | if (mddev->recovery || mddev->sync_thread) | |
5748 | return -EBUSY; | |
5749 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5750 | /* add the bitmap */ | |
5751 | if (mddev->bitmap) | |
5752 | return -EEXIST; | |
c3d9714e | 5753 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5754 | return -EINVAL; |
c3d9714e N |
5755 | mddev->bitmap_info.offset = |
5756 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5757 | mddev->pers->quiesce(mddev, 1); |
5758 | rv = bitmap_create(mddev); | |
69e51b44 N |
5759 | if (!rv) |
5760 | rv = bitmap_load(mddev); | |
36fa3063 N |
5761 | if (rv) |
5762 | bitmap_destroy(mddev); | |
5763 | mddev->pers->quiesce(mddev, 0); | |
5764 | } else { | |
5765 | /* remove the bitmap */ | |
5766 | if (!mddev->bitmap) | |
5767 | return -ENOENT; | |
5768 | if (mddev->bitmap->file) | |
5769 | return -EINVAL; | |
5770 | mddev->pers->quiesce(mddev, 1); | |
5771 | bitmap_destroy(mddev); | |
5772 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5773 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5774 | } |
5775 | } | |
850b2b42 | 5776 | md_update_sb(mddev, 1); |
1da177e4 LT |
5777 | return rv; |
5778 | } | |
5779 | ||
5780 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5781 | { | |
5782 | mdk_rdev_t *rdev; | |
5783 | ||
5784 | if (mddev->pers == NULL) | |
5785 | return -ENODEV; | |
5786 | ||
5787 | rdev = find_rdev(mddev, dev); | |
5788 | if (!rdev) | |
5789 | return -ENODEV; | |
5790 | ||
5791 | md_error(mddev, rdev); | |
5792 | return 0; | |
5793 | } | |
5794 | ||
2f9618ce AN |
5795 | /* |
5796 | * We have a problem here : there is no easy way to give a CHS | |
5797 | * virtual geometry. We currently pretend that we have a 2 heads | |
5798 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5799 | * dosfs just mad... ;-) | |
5800 | */ | |
a885c8c4 CH |
5801 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5802 | { | |
5803 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5804 | ||
5805 | geo->heads = 2; | |
5806 | geo->sectors = 4; | |
49ce6cea | 5807 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
5808 | return 0; |
5809 | } | |
5810 | ||
a39907fa | 5811 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5812 | unsigned int cmd, unsigned long arg) |
5813 | { | |
5814 | int err = 0; | |
5815 | void __user *argp = (void __user *)arg; | |
1da177e4 | 5816 | mddev_t *mddev = NULL; |
e2218350 | 5817 | int ro; |
1da177e4 LT |
5818 | |
5819 | if (!capable(CAP_SYS_ADMIN)) | |
5820 | return -EACCES; | |
5821 | ||
5822 | /* | |
5823 | * Commands dealing with the RAID driver but not any | |
5824 | * particular array: | |
5825 | */ | |
5826 | switch (cmd) | |
5827 | { | |
5828 | case RAID_VERSION: | |
5829 | err = get_version(argp); | |
5830 | goto done; | |
5831 | ||
5832 | case PRINT_RAID_DEBUG: | |
5833 | err = 0; | |
5834 | md_print_devices(); | |
5835 | goto done; | |
5836 | ||
5837 | #ifndef MODULE | |
5838 | case RAID_AUTORUN: | |
5839 | err = 0; | |
5840 | autostart_arrays(arg); | |
5841 | goto done; | |
5842 | #endif | |
5843 | default:; | |
5844 | } | |
5845 | ||
5846 | /* | |
5847 | * Commands creating/starting a new array: | |
5848 | */ | |
5849 | ||
a39907fa | 5850 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5851 | |
5852 | if (!mddev) { | |
5853 | BUG(); | |
5854 | goto abort; | |
5855 | } | |
5856 | ||
1da177e4 LT |
5857 | err = mddev_lock(mddev); |
5858 | if (err) { | |
5859 | printk(KERN_INFO | |
5860 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5861 | err, cmd); | |
5862 | goto abort; | |
5863 | } | |
5864 | ||
5865 | switch (cmd) | |
5866 | { | |
5867 | case SET_ARRAY_INFO: | |
5868 | { | |
5869 | mdu_array_info_t info; | |
5870 | if (!arg) | |
5871 | memset(&info, 0, sizeof(info)); | |
5872 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5873 | err = -EFAULT; | |
5874 | goto abort_unlock; | |
5875 | } | |
5876 | if (mddev->pers) { | |
5877 | err = update_array_info(mddev, &info); | |
5878 | if (err) { | |
5879 | printk(KERN_WARNING "md: couldn't update" | |
5880 | " array info. %d\n", err); | |
5881 | goto abort_unlock; | |
5882 | } | |
5883 | goto done_unlock; | |
5884 | } | |
5885 | if (!list_empty(&mddev->disks)) { | |
5886 | printk(KERN_WARNING | |
5887 | "md: array %s already has disks!\n", | |
5888 | mdname(mddev)); | |
5889 | err = -EBUSY; | |
5890 | goto abort_unlock; | |
5891 | } | |
5892 | if (mddev->raid_disks) { | |
5893 | printk(KERN_WARNING | |
5894 | "md: array %s already initialised!\n", | |
5895 | mdname(mddev)); | |
5896 | err = -EBUSY; | |
5897 | goto abort_unlock; | |
5898 | } | |
5899 | err = set_array_info(mddev, &info); | |
5900 | if (err) { | |
5901 | printk(KERN_WARNING "md: couldn't set" | |
5902 | " array info. %d\n", err); | |
5903 | goto abort_unlock; | |
5904 | } | |
5905 | } | |
5906 | goto done_unlock; | |
5907 | ||
5908 | default:; | |
5909 | } | |
5910 | ||
5911 | /* | |
5912 | * Commands querying/configuring an existing array: | |
5913 | */ | |
32a7627c | 5914 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5915 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5916 | if ((!mddev->raid_disks && !mddev->external) |
5917 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5918 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5919 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5920 | err = -ENODEV; |
5921 | goto abort_unlock; | |
5922 | } | |
5923 | ||
5924 | /* | |
5925 | * Commands even a read-only array can execute: | |
5926 | */ | |
5927 | switch (cmd) | |
5928 | { | |
5929 | case GET_ARRAY_INFO: | |
5930 | err = get_array_info(mddev, argp); | |
5931 | goto done_unlock; | |
5932 | ||
32a7627c | 5933 | case GET_BITMAP_FILE: |
87162a28 | 5934 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5935 | goto done_unlock; |
5936 | ||
1da177e4 LT |
5937 | case GET_DISK_INFO: |
5938 | err = get_disk_info(mddev, argp); | |
5939 | goto done_unlock; | |
5940 | ||
5941 | case RESTART_ARRAY_RW: | |
5942 | err = restart_array(mddev); | |
5943 | goto done_unlock; | |
5944 | ||
5945 | case STOP_ARRAY: | |
d710e138 | 5946 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5947 | goto done_unlock; |
5948 | ||
5949 | case STOP_ARRAY_RO: | |
a4bd82d0 | 5950 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
5951 | goto done_unlock; |
5952 | ||
e2218350 DW |
5953 | case BLKROSET: |
5954 | if (get_user(ro, (int __user *)(arg))) { | |
5955 | err = -EFAULT; | |
5956 | goto done_unlock; | |
5957 | } | |
5958 | err = -EINVAL; | |
5959 | ||
5960 | /* if the bdev is going readonly the value of mddev->ro | |
5961 | * does not matter, no writes are coming | |
5962 | */ | |
5963 | if (ro) | |
5964 | goto done_unlock; | |
5965 | ||
5966 | /* are we are already prepared for writes? */ | |
5967 | if (mddev->ro != 1) | |
5968 | goto done_unlock; | |
5969 | ||
5970 | /* transitioning to readauto need only happen for | |
5971 | * arrays that call md_write_start | |
5972 | */ | |
5973 | if (mddev->pers) { | |
5974 | err = restart_array(mddev); | |
5975 | if (err == 0) { | |
5976 | mddev->ro = 2; | |
5977 | set_disk_ro(mddev->gendisk, 0); | |
5978 | } | |
5979 | } | |
5980 | goto done_unlock; | |
1da177e4 LT |
5981 | } |
5982 | ||
5983 | /* | |
5984 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5985 | * superblock, so we do not allow them on read-only arrays. |
5986 | * However non-MD ioctls (e.g. get-size) will still come through | |
5987 | * here and hit the 'default' below, so only disallow | |
5988 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5989 | */ |
bb57fc64 | 5990 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5991 | if (mddev->ro == 2) { |
5992 | mddev->ro = 0; | |
00bcb4ac | 5993 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
5994 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5995 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5996 | } else { |
5997 | err = -EROFS; | |
5998 | goto abort_unlock; | |
5999 | } | |
1da177e4 LT |
6000 | } |
6001 | ||
6002 | switch (cmd) | |
6003 | { | |
6004 | case ADD_NEW_DISK: | |
6005 | { | |
6006 | mdu_disk_info_t info; | |
6007 | if (copy_from_user(&info, argp, sizeof(info))) | |
6008 | err = -EFAULT; | |
6009 | else | |
6010 | err = add_new_disk(mddev, &info); | |
6011 | goto done_unlock; | |
6012 | } | |
6013 | ||
6014 | case HOT_REMOVE_DISK: | |
6015 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
6016 | goto done_unlock; | |
6017 | ||
6018 | case HOT_ADD_DISK: | |
6019 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
6020 | goto done_unlock; | |
6021 | ||
6022 | case SET_DISK_FAULTY: | |
6023 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
6024 | goto done_unlock; | |
6025 | ||
6026 | case RUN_ARRAY: | |
d710e138 | 6027 | err = do_md_run(mddev); |
1da177e4 LT |
6028 | goto done_unlock; |
6029 | ||
32a7627c N |
6030 | case SET_BITMAP_FILE: |
6031 | err = set_bitmap_file(mddev, (int)arg); | |
6032 | goto done_unlock; | |
6033 | ||
1da177e4 | 6034 | default: |
1da177e4 LT |
6035 | err = -EINVAL; |
6036 | goto abort_unlock; | |
6037 | } | |
6038 | ||
6039 | done_unlock: | |
6040 | abort_unlock: | |
d3374825 N |
6041 | if (mddev->hold_active == UNTIL_IOCTL && |
6042 | err != -EINVAL) | |
6043 | mddev->hold_active = 0; | |
1da177e4 LT |
6044 | mddev_unlock(mddev); |
6045 | ||
6046 | return err; | |
6047 | done: | |
6048 | if (err) | |
6049 | MD_BUG(); | |
6050 | abort: | |
6051 | return err; | |
6052 | } | |
aa98aa31 AB |
6053 | #ifdef CONFIG_COMPAT |
6054 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6055 | unsigned int cmd, unsigned long arg) | |
6056 | { | |
6057 | switch (cmd) { | |
6058 | case HOT_REMOVE_DISK: | |
6059 | case HOT_ADD_DISK: | |
6060 | case SET_DISK_FAULTY: | |
6061 | case SET_BITMAP_FILE: | |
6062 | /* These take in integer arg, do not convert */ | |
6063 | break; | |
6064 | default: | |
6065 | arg = (unsigned long)compat_ptr(arg); | |
6066 | break; | |
6067 | } | |
6068 | ||
6069 | return md_ioctl(bdev, mode, cmd, arg); | |
6070 | } | |
6071 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6072 | |
a39907fa | 6073 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6074 | { |
6075 | /* | |
6076 | * Succeed if we can lock the mddev, which confirms that | |
6077 | * it isn't being stopped right now. | |
6078 | */ | |
d3374825 | 6079 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6080 | int err; |
6081 | ||
d3374825 N |
6082 | if (mddev->gendisk != bdev->bd_disk) { |
6083 | /* we are racing with mddev_put which is discarding this | |
6084 | * bd_disk. | |
6085 | */ | |
6086 | mddev_put(mddev); | |
6087 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6088 | flush_workqueue(md_misc_wq); |
d3374825 N |
6089 | /* Then retry the open from the top */ |
6090 | return -ERESTARTSYS; | |
6091 | } | |
6092 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6093 | ||
c8c00a69 | 6094 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6095 | goto out; |
6096 | ||
6097 | err = 0; | |
f2ea68cf | 6098 | atomic_inc(&mddev->openers); |
c8c00a69 | 6099 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6100 | |
f0b4f7e2 | 6101 | check_disk_change(bdev); |
1da177e4 LT |
6102 | out: |
6103 | return err; | |
6104 | } | |
6105 | ||
a39907fa | 6106 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6107 | { |
a39907fa | 6108 | mddev_t *mddev = disk->private_data; |
1da177e4 | 6109 | |
52e5f9d1 | 6110 | BUG_ON(!mddev); |
f2ea68cf | 6111 | atomic_dec(&mddev->openers); |
1da177e4 LT |
6112 | mddev_put(mddev); |
6113 | ||
6114 | return 0; | |
6115 | } | |
f0b4f7e2 N |
6116 | |
6117 | static int md_media_changed(struct gendisk *disk) | |
6118 | { | |
6119 | mddev_t *mddev = disk->private_data; | |
6120 | ||
6121 | return mddev->changed; | |
6122 | } | |
6123 | ||
6124 | static int md_revalidate(struct gendisk *disk) | |
6125 | { | |
6126 | mddev_t *mddev = disk->private_data; | |
6127 | ||
6128 | mddev->changed = 0; | |
6129 | return 0; | |
6130 | } | |
83d5cde4 | 6131 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6132 | { |
6133 | .owner = THIS_MODULE, | |
a39907fa AV |
6134 | .open = md_open, |
6135 | .release = md_release, | |
b492b852 | 6136 | .ioctl = md_ioctl, |
aa98aa31 AB |
6137 | #ifdef CONFIG_COMPAT |
6138 | .compat_ioctl = md_compat_ioctl, | |
6139 | #endif | |
a885c8c4 | 6140 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6141 | .media_changed = md_media_changed, |
6142 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6143 | }; |
6144 | ||
75c96f85 | 6145 | static int md_thread(void * arg) |
1da177e4 LT |
6146 | { |
6147 | mdk_thread_t *thread = arg; | |
6148 | ||
1da177e4 LT |
6149 | /* |
6150 | * md_thread is a 'system-thread', it's priority should be very | |
6151 | * high. We avoid resource deadlocks individually in each | |
6152 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6153 | * the very same RT priority as kswapd, thus we will never get | |
6154 | * into a priority inversion deadlock. | |
6155 | * | |
6156 | * we definitely have to have equal or higher priority than | |
6157 | * bdflush, otherwise bdflush will deadlock if there are too | |
6158 | * many dirty RAID5 blocks. | |
6159 | */ | |
1da177e4 | 6160 | |
6985c43f | 6161 | allow_signal(SIGKILL); |
a6fb0934 | 6162 | while (!kthread_should_stop()) { |
1da177e4 | 6163 | |
93588e22 N |
6164 | /* We need to wait INTERRUPTIBLE so that |
6165 | * we don't add to the load-average. | |
6166 | * That means we need to be sure no signals are | |
6167 | * pending | |
6168 | */ | |
6169 | if (signal_pending(current)) | |
6170 | flush_signals(current); | |
6171 | ||
6172 | wait_event_interruptible_timeout | |
6173 | (thread->wqueue, | |
6174 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6175 | || kthread_should_stop(), | |
6176 | thread->timeout); | |
1da177e4 | 6177 | |
6c987910 N |
6178 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6179 | if (!kthread_should_stop()) | |
589a594b | 6180 | thread->run(thread->mddev); |
1da177e4 | 6181 | } |
a6fb0934 | 6182 | |
1da177e4 LT |
6183 | return 0; |
6184 | } | |
6185 | ||
6186 | void md_wakeup_thread(mdk_thread_t *thread) | |
6187 | { | |
6188 | if (thread) { | |
6189 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
6190 | set_bit(THREAD_WAKEUP, &thread->flags); | |
6191 | wake_up(&thread->wqueue); | |
6192 | } | |
6193 | } | |
6194 | ||
6195 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
6196 | const char *name) | |
6197 | { | |
6198 | mdk_thread_t *thread; | |
1da177e4 | 6199 | |
9ffae0cf | 6200 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
6201 | if (!thread) |
6202 | return NULL; | |
6203 | ||
1da177e4 LT |
6204 | init_waitqueue_head(&thread->wqueue); |
6205 | ||
1da177e4 LT |
6206 | thread->run = run; |
6207 | thread->mddev = mddev; | |
32a7627c | 6208 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6209 | thread->tsk = kthread_run(md_thread, thread, |
6210 | "%s_%s", | |
6211 | mdname(thread->mddev), | |
6212 | name ?: mddev->pers->name); | |
a6fb0934 | 6213 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6214 | kfree(thread); |
6215 | return NULL; | |
6216 | } | |
1da177e4 LT |
6217 | return thread; |
6218 | } | |
6219 | ||
1da177e4 LT |
6220 | void md_unregister_thread(mdk_thread_t *thread) |
6221 | { | |
e0cf8f04 N |
6222 | if (!thread) |
6223 | return; | |
ba25f9dc | 6224 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
6225 | |
6226 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6227 | kfree(thread); |
6228 | } | |
6229 | ||
6230 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
6231 | { | |
6232 | if (!mddev) { | |
6233 | MD_BUG(); | |
6234 | return; | |
6235 | } | |
6236 | ||
b2d444d7 | 6237 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6238 | return; |
6bfe0b49 DW |
6239 | |
6240 | if (mddev->external) | |
6241 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 6242 | /* |
1da177e4 LT |
6243 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
6244 | mdname(mddev), | |
6245 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
6246 | __builtin_return_address(0),__builtin_return_address(1), | |
6247 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 6248 | */ |
d0a0a5ee AM |
6249 | if (!mddev->pers) |
6250 | return; | |
1da177e4 LT |
6251 | if (!mddev->pers->error_handler) |
6252 | return; | |
6253 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6254 | if (mddev->degraded) |
6255 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6256 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6257 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6258 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6259 | md_wakeup_thread(mddev->thread); | |
768a418d | 6260 | if (mddev->event_work.func) |
e804ac78 | 6261 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6262 | md_new_event_inintr(mddev); |
1da177e4 LT |
6263 | } |
6264 | ||
6265 | /* seq_file implementation /proc/mdstat */ | |
6266 | ||
6267 | static void status_unused(struct seq_file *seq) | |
6268 | { | |
6269 | int i = 0; | |
6270 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6271 | |
6272 | seq_printf(seq, "unused devices: "); | |
6273 | ||
159ec1fc | 6274 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6275 | char b[BDEVNAME_SIZE]; |
6276 | i++; | |
6277 | seq_printf(seq, "%s ", | |
6278 | bdevname(rdev->bdev,b)); | |
6279 | } | |
6280 | if (!i) | |
6281 | seq_printf(seq, "<none>"); | |
6282 | ||
6283 | seq_printf(seq, "\n"); | |
6284 | } | |
6285 | ||
6286 | ||
6287 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
6288 | { | |
dd71cf6b N |
6289 | sector_t max_sectors, resync, res; |
6290 | unsigned long dt, db; | |
6291 | sector_t rt; | |
4588b42e N |
6292 | int scale; |
6293 | unsigned int per_milli; | |
1da177e4 | 6294 | |
dd71cf6b | 6295 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6296 | |
6297 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6298 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6299 | else |
dd71cf6b | 6300 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6301 | |
6302 | /* | |
6303 | * Should not happen. | |
6304 | */ | |
dd71cf6b | 6305 | if (!max_sectors) { |
1da177e4 LT |
6306 | MD_BUG(); |
6307 | return; | |
6308 | } | |
4588b42e | 6309 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6310 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6311 | * u32, as those are the requirements for sector_div. |
6312 | * Thus 'scale' must be at least 10 | |
6313 | */ | |
6314 | scale = 10; | |
6315 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6316 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6317 | scale++; |
6318 | } | |
6319 | res = (resync>>scale)*1000; | |
dd71cf6b | 6320 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6321 | |
6322 | per_milli = res; | |
1da177e4 | 6323 | { |
4588b42e | 6324 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6325 | seq_printf(seq, "["); |
6326 | for (i = 0; i < x; i++) | |
6327 | seq_printf(seq, "="); | |
6328 | seq_printf(seq, ">"); | |
6329 | for (i = 0; i < y; i++) | |
6330 | seq_printf(seq, "."); | |
6331 | seq_printf(seq, "] "); | |
6332 | } | |
4588b42e | 6333 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6334 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6335 | "reshape" : | |
61df9d91 N |
6336 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6337 | "check" : | |
6338 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6339 | "resync" : "recovery"))), | |
6340 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6341 | (unsigned long long) resync/2, |
6342 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6343 | |
6344 | /* | |
1da177e4 LT |
6345 | * dt: time from mark until now |
6346 | * db: blocks written from mark until now | |
6347 | * rt: remaining time | |
dd71cf6b N |
6348 | * |
6349 | * rt is a sector_t, so could be 32bit or 64bit. | |
6350 | * So we divide before multiply in case it is 32bit and close | |
6351 | * to the limit. | |
25985edc | 6352 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6353 | * near the end of resync when the number of remaining sectors |
6354 | * is close to 'db'. | |
6355 | * We then divide rt by 32 after multiplying by db to compensate. | |
6356 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6357 | */ |
6358 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6359 | if (!dt) dt++; | |
ff4e8d9a N |
6360 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6361 | - mddev->resync_mark_cnt; | |
1da177e4 | 6362 | |
dd71cf6b N |
6363 | rt = max_sectors - resync; /* number of remaining sectors */ |
6364 | sector_div(rt, db/32+1); | |
6365 | rt *= dt; | |
6366 | rt >>= 5; | |
6367 | ||
6368 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6369 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6370 | |
ff4e8d9a | 6371 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6372 | } |
6373 | ||
6374 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6375 | { | |
6376 | struct list_head *tmp; | |
6377 | loff_t l = *pos; | |
6378 | mddev_t *mddev; | |
6379 | ||
6380 | if (l >= 0x10000) | |
6381 | return NULL; | |
6382 | if (!l--) | |
6383 | /* header */ | |
6384 | return (void*)1; | |
6385 | ||
6386 | spin_lock(&all_mddevs_lock); | |
6387 | list_for_each(tmp,&all_mddevs) | |
6388 | if (!l--) { | |
6389 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6390 | mddev_get(mddev); | |
6391 | spin_unlock(&all_mddevs_lock); | |
6392 | return mddev; | |
6393 | } | |
6394 | spin_unlock(&all_mddevs_lock); | |
6395 | if (!l--) | |
6396 | return (void*)2;/* tail */ | |
6397 | return NULL; | |
6398 | } | |
6399 | ||
6400 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6401 | { | |
6402 | struct list_head *tmp; | |
6403 | mddev_t *next_mddev, *mddev = v; | |
6404 | ||
6405 | ++*pos; | |
6406 | if (v == (void*)2) | |
6407 | return NULL; | |
6408 | ||
6409 | spin_lock(&all_mddevs_lock); | |
6410 | if (v == (void*)1) | |
6411 | tmp = all_mddevs.next; | |
6412 | else | |
6413 | tmp = mddev->all_mddevs.next; | |
6414 | if (tmp != &all_mddevs) | |
6415 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6416 | else { | |
6417 | next_mddev = (void*)2; | |
6418 | *pos = 0x10000; | |
6419 | } | |
6420 | spin_unlock(&all_mddevs_lock); | |
6421 | ||
6422 | if (v != (void*)1) | |
6423 | mddev_put(mddev); | |
6424 | return next_mddev; | |
6425 | ||
6426 | } | |
6427 | ||
6428 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6429 | { | |
6430 | mddev_t *mddev = v; | |
6431 | ||
6432 | if (mddev && v != (void*)1 && v != (void*)2) | |
6433 | mddev_put(mddev); | |
6434 | } | |
6435 | ||
d7603b7e N |
6436 | struct mdstat_info { |
6437 | int event; | |
6438 | }; | |
6439 | ||
1da177e4 LT |
6440 | static int md_seq_show(struct seq_file *seq, void *v) |
6441 | { | |
6442 | mddev_t *mddev = v; | |
dd8ac336 | 6443 | sector_t sectors; |
1da177e4 | 6444 | mdk_rdev_t *rdev; |
d7603b7e | 6445 | struct mdstat_info *mi = seq->private; |
32a7627c | 6446 | struct bitmap *bitmap; |
1da177e4 LT |
6447 | |
6448 | if (v == (void*)1) { | |
2604b703 | 6449 | struct mdk_personality *pers; |
1da177e4 LT |
6450 | seq_printf(seq, "Personalities : "); |
6451 | spin_lock(&pers_lock); | |
2604b703 N |
6452 | list_for_each_entry(pers, &pers_list, list) |
6453 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6454 | |
6455 | spin_unlock(&pers_lock); | |
6456 | seq_printf(seq, "\n"); | |
d7603b7e | 6457 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6458 | return 0; |
6459 | } | |
6460 | if (v == (void*)2) { | |
6461 | status_unused(seq); | |
6462 | return 0; | |
6463 | } | |
6464 | ||
5dc5cf7d | 6465 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6466 | return -EINTR; |
5dc5cf7d | 6467 | |
1da177e4 LT |
6468 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6469 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6470 | mddev->pers ? "" : "in"); | |
6471 | if (mddev->pers) { | |
f91de92e | 6472 | if (mddev->ro==1) |
1da177e4 | 6473 | seq_printf(seq, " (read-only)"); |
f91de92e | 6474 | if (mddev->ro==2) |
52720ae7 | 6475 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6476 | seq_printf(seq, " %s", mddev->pers->name); |
6477 | } | |
6478 | ||
dd8ac336 | 6479 | sectors = 0; |
159ec1fc | 6480 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6481 | char b[BDEVNAME_SIZE]; |
6482 | seq_printf(seq, " %s[%d]", | |
6483 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6484 | if (test_bit(WriteMostly, &rdev->flags)) |
6485 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6486 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6487 | seq_printf(seq, "(F)"); |
6488 | continue; | |
b325a32e N |
6489 | } else if (rdev->raid_disk < 0) |
6490 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6491 | sectors += rdev->sectors; |
1da177e4 LT |
6492 | } |
6493 | ||
6494 | if (!list_empty(&mddev->disks)) { | |
6495 | if (mddev->pers) | |
6496 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6497 | (unsigned long long) |
6498 | mddev->array_sectors / 2); | |
1da177e4 LT |
6499 | else |
6500 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6501 | (unsigned long long)sectors / 2); |
1da177e4 | 6502 | } |
1cd6bf19 N |
6503 | if (mddev->persistent) { |
6504 | if (mddev->major_version != 0 || | |
6505 | mddev->minor_version != 90) { | |
6506 | seq_printf(seq," super %d.%d", | |
6507 | mddev->major_version, | |
6508 | mddev->minor_version); | |
6509 | } | |
e691063a N |
6510 | } else if (mddev->external) |
6511 | seq_printf(seq, " super external:%s", | |
6512 | mddev->metadata_type); | |
6513 | else | |
1cd6bf19 | 6514 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6515 | |
6516 | if (mddev->pers) { | |
d710e138 | 6517 | mddev->pers->status(seq, mddev); |
1da177e4 | 6518 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6519 | if (mddev->pers->sync_request) { |
6520 | if (mddev->curr_resync > 2) { | |
d710e138 | 6521 | status_resync(seq, mddev); |
8e1b39d6 N |
6522 | seq_printf(seq, "\n "); |
6523 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6524 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6525 | else if (mddev->recovery_cp < MaxSector) | |
6526 | seq_printf(seq, "\tresync=PENDING\n "); | |
6527 | } | |
32a7627c N |
6528 | } else |
6529 | seq_printf(seq, "\n "); | |
6530 | ||
6531 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6532 | unsigned long chunk_kb; |
6533 | unsigned long flags; | |
32a7627c | 6534 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6535 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6536 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6537 | "%lu%s chunk", | |
6538 | bitmap->pages - bitmap->missing_pages, | |
6539 | bitmap->pages, | |
6540 | (bitmap->pages - bitmap->missing_pages) | |
6541 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6542 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6543 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6544 | if (bitmap->file) { |
6545 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6546 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6547 | } |
78d742d8 | 6548 | |
32a7627c N |
6549 | seq_printf(seq, "\n"); |
6550 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6551 | } |
6552 | ||
6553 | seq_printf(seq, "\n"); | |
6554 | } | |
6555 | mddev_unlock(mddev); | |
6556 | ||
6557 | return 0; | |
6558 | } | |
6559 | ||
110518bc | 6560 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6561 | .start = md_seq_start, |
6562 | .next = md_seq_next, | |
6563 | .stop = md_seq_stop, | |
6564 | .show = md_seq_show, | |
6565 | }; | |
6566 | ||
6567 | static int md_seq_open(struct inode *inode, struct file *file) | |
6568 | { | |
6569 | int error; | |
d7603b7e N |
6570 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6571 | if (mi == NULL) | |
6572 | return -ENOMEM; | |
1da177e4 LT |
6573 | |
6574 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6575 | if (error) |
6576 | kfree(mi); | |
6577 | else { | |
6578 | struct seq_file *p = file->private_data; | |
6579 | p->private = mi; | |
6580 | mi->event = atomic_read(&md_event_count); | |
6581 | } | |
1da177e4 LT |
6582 | return error; |
6583 | } | |
6584 | ||
d7603b7e N |
6585 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6586 | { | |
6587 | struct seq_file *m = filp->private_data; | |
6588 | struct mdstat_info *mi = m->private; | |
6589 | int mask; | |
6590 | ||
6591 | poll_wait(filp, &md_event_waiters, wait); | |
6592 | ||
6593 | /* always allow read */ | |
6594 | mask = POLLIN | POLLRDNORM; | |
6595 | ||
6596 | if (mi->event != atomic_read(&md_event_count)) | |
6597 | mask |= POLLERR | POLLPRI; | |
6598 | return mask; | |
6599 | } | |
6600 | ||
fa027c2a | 6601 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6602 | .owner = THIS_MODULE, |
1da177e4 LT |
6603 | .open = md_seq_open, |
6604 | .read = seq_read, | |
6605 | .llseek = seq_lseek, | |
c3f94b40 | 6606 | .release = seq_release_private, |
d7603b7e | 6607 | .poll = mdstat_poll, |
1da177e4 LT |
6608 | }; |
6609 | ||
2604b703 | 6610 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6611 | { |
1da177e4 | 6612 | spin_lock(&pers_lock); |
2604b703 N |
6613 | list_add_tail(&p->list, &pers_list); |
6614 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6615 | spin_unlock(&pers_lock); |
6616 | return 0; | |
6617 | } | |
6618 | ||
2604b703 | 6619 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6620 | { |
2604b703 | 6621 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6622 | spin_lock(&pers_lock); |
2604b703 | 6623 | list_del_init(&p->list); |
1da177e4 LT |
6624 | spin_unlock(&pers_lock); |
6625 | return 0; | |
6626 | } | |
6627 | ||
eea1bf38 | 6628 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6629 | { |
6630 | mdk_rdev_t * rdev; | |
1da177e4 | 6631 | int idle; |
eea1bf38 | 6632 | int curr_events; |
1da177e4 LT |
6633 | |
6634 | idle = 1; | |
4b80991c N |
6635 | rcu_read_lock(); |
6636 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6637 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6638 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6639 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6640 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6641 | /* sync IO will cause sync_io to increase before the disk_stats |
6642 | * as sync_io is counted when a request starts, and | |
6643 | * disk_stats is counted when it completes. | |
6644 | * So resync activity will cause curr_events to be smaller than | |
6645 | * when there was no such activity. | |
6646 | * non-sync IO will cause disk_stat to increase without | |
6647 | * increasing sync_io so curr_events will (eventually) | |
6648 | * be larger than it was before. Once it becomes | |
6649 | * substantially larger, the test below will cause | |
6650 | * the array to appear non-idle, and resync will slow | |
6651 | * down. | |
6652 | * If there is a lot of outstanding resync activity when | |
6653 | * we set last_event to curr_events, then all that activity | |
6654 | * completing might cause the array to appear non-idle | |
6655 | * and resync will be slowed down even though there might | |
6656 | * not have been non-resync activity. This will only | |
6657 | * happen once though. 'last_events' will soon reflect | |
6658 | * the state where there is little or no outstanding | |
6659 | * resync requests, and further resync activity will | |
6660 | * always make curr_events less than last_events. | |
c0e48521 | 6661 | * |
1da177e4 | 6662 | */ |
eea1bf38 | 6663 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6664 | rdev->last_events = curr_events; |
6665 | idle = 0; | |
6666 | } | |
6667 | } | |
4b80991c | 6668 | rcu_read_unlock(); |
1da177e4 LT |
6669 | return idle; |
6670 | } | |
6671 | ||
6672 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6673 | { | |
6674 | /* another "blocks" (512byte) blocks have been synced */ | |
6675 | atomic_sub(blocks, &mddev->recovery_active); | |
6676 | wake_up(&mddev->recovery_wait); | |
6677 | if (!ok) { | |
dfc70645 | 6678 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6679 | md_wakeup_thread(mddev->thread); |
6680 | // stop recovery, signal do_sync .... | |
6681 | } | |
6682 | } | |
6683 | ||
6684 | ||
06d91a5f N |
6685 | /* md_write_start(mddev, bi) |
6686 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6687 | * in superblock) before writing, schedule a superblock update |
6688 | * and wait for it to complete. | |
06d91a5f | 6689 | */ |
3d310eb7 | 6690 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6691 | { |
0fd62b86 | 6692 | int did_change = 0; |
06d91a5f | 6693 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6694 | return; |
06d91a5f | 6695 | |
f91de92e N |
6696 | BUG_ON(mddev->ro == 1); |
6697 | if (mddev->ro == 2) { | |
6698 | /* need to switch to read/write */ | |
6699 | mddev->ro = 0; | |
6700 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6701 | md_wakeup_thread(mddev->thread); | |
25156198 | 6702 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6703 | did_change = 1; |
f91de92e | 6704 | } |
06d91a5f | 6705 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6706 | if (mddev->safemode == 1) |
6707 | mddev->safemode = 0; | |
06d91a5f | 6708 | if (mddev->in_sync) { |
a9701a30 | 6709 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6710 | if (mddev->in_sync) { |
6711 | mddev->in_sync = 0; | |
850b2b42 | 6712 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 6713 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 6714 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6715 | did_change = 1; |
3d310eb7 | 6716 | } |
a9701a30 | 6717 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6718 | } |
0fd62b86 | 6719 | if (did_change) |
00bcb4ac | 6720 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 6721 | wait_event(mddev->sb_wait, |
09a44cc1 | 6722 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
6723 | } |
6724 | ||
6725 | void md_write_end(mddev_t *mddev) | |
6726 | { | |
6727 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6728 | if (mddev->safemode == 2) | |
6729 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6730 | else if (mddev->safemode_delay) |
1da177e4 LT |
6731 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6732 | } | |
6733 | } | |
6734 | ||
2a2275d6 N |
6735 | /* md_allow_write(mddev) |
6736 | * Calling this ensures that the array is marked 'active' so that writes | |
6737 | * may proceed without blocking. It is important to call this before | |
6738 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6739 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6740 | * |
6741 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6742 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6743 | */ |
b5470dc5 | 6744 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6745 | { |
6746 | if (!mddev->pers) | |
b5470dc5 | 6747 | return 0; |
2a2275d6 | 6748 | if (mddev->ro) |
b5470dc5 | 6749 | return 0; |
1a0fd497 | 6750 | if (!mddev->pers->sync_request) |
b5470dc5 | 6751 | return 0; |
2a2275d6 N |
6752 | |
6753 | spin_lock_irq(&mddev->write_lock); | |
6754 | if (mddev->in_sync) { | |
6755 | mddev->in_sync = 0; | |
6756 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 6757 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
6758 | if (mddev->safemode_delay && |
6759 | mddev->safemode == 0) | |
6760 | mddev->safemode = 1; | |
6761 | spin_unlock_irq(&mddev->write_lock); | |
6762 | md_update_sb(mddev, 0); | |
00bcb4ac | 6763 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
6764 | } else |
6765 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 6766 | |
070dc6dd | 6767 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
6768 | return -EAGAIN; |
6769 | else | |
6770 | return 0; | |
2a2275d6 N |
6771 | } |
6772 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6773 | ||
1da177e4 LT |
6774 | #define SYNC_MARKS 10 |
6775 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6776 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6777 | { |
6778 | mddev_t *mddev2; | |
6779 | unsigned int currspeed = 0, | |
6780 | window; | |
57afd89f | 6781 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6782 | unsigned long mark[SYNC_MARKS]; |
6783 | sector_t mark_cnt[SYNC_MARKS]; | |
6784 | int last_mark,m; | |
6785 | struct list_head *tmp; | |
6786 | sector_t last_check; | |
57afd89f | 6787 | int skipped = 0; |
5fd6c1dc | 6788 | mdk_rdev_t *rdev; |
61df9d91 | 6789 | char *desc; |
1da177e4 LT |
6790 | |
6791 | /* just incase thread restarts... */ | |
6792 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6793 | return; | |
5fd6c1dc N |
6794 | if (mddev->ro) /* never try to sync a read-only array */ |
6795 | return; | |
1da177e4 | 6796 | |
61df9d91 N |
6797 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6798 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6799 | desc = "data-check"; | |
6800 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6801 | desc = "requested-resync"; | |
6802 | else | |
6803 | desc = "resync"; | |
6804 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6805 | desc = "reshape"; | |
6806 | else | |
6807 | desc = "recovery"; | |
6808 | ||
1da177e4 LT |
6809 | /* we overload curr_resync somewhat here. |
6810 | * 0 == not engaged in resync at all | |
6811 | * 2 == checking that there is no conflict with another sync | |
6812 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6813 | * commense | |
6814 | * other == active in resync - this many blocks | |
6815 | * | |
6816 | * Before starting a resync we must have set curr_resync to | |
6817 | * 2, and then checked that every "conflicting" array has curr_resync | |
6818 | * less than ours. When we find one that is the same or higher | |
6819 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6820 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6821 | * This will mean we have to start checking from the beginning again. | |
6822 | * | |
6823 | */ | |
6824 | ||
6825 | do { | |
6826 | mddev->curr_resync = 2; | |
6827 | ||
6828 | try_again: | |
404e4b43 | 6829 | if (kthread_should_stop()) |
6985c43f | 6830 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
6831 | |
6832 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 6833 | goto skip; |
29ac4aa3 | 6834 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6835 | if (mddev2 == mddev) |
6836 | continue; | |
90b08710 BS |
6837 | if (!mddev->parallel_resync |
6838 | && mddev2->curr_resync | |
6839 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6840 | DEFINE_WAIT(wq); |
6841 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6842 | /* arbitrarily yield */ | |
6843 | mddev->curr_resync = 1; | |
6844 | wake_up(&resync_wait); | |
6845 | } | |
6846 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6847 | /* no need to wait here, we can wait the next | |
6848 | * time 'round when curr_resync == 2 | |
6849 | */ | |
6850 | continue; | |
9744197c N |
6851 | /* We need to wait 'interruptible' so as not to |
6852 | * contribute to the load average, and not to | |
6853 | * be caught by 'softlockup' | |
6854 | */ | |
6855 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6856 | if (!kthread_should_stop() && |
8712e553 | 6857 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6858 | printk(KERN_INFO "md: delaying %s of %s" |
6859 | " until %s has finished (they" | |
1da177e4 | 6860 | " share one or more physical units)\n", |
61df9d91 | 6861 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6862 | mddev_put(mddev2); |
9744197c N |
6863 | if (signal_pending(current)) |
6864 | flush_signals(current); | |
1da177e4 LT |
6865 | schedule(); |
6866 | finish_wait(&resync_wait, &wq); | |
6867 | goto try_again; | |
6868 | } | |
6869 | finish_wait(&resync_wait, &wq); | |
6870 | } | |
6871 | } | |
6872 | } while (mddev->curr_resync < 2); | |
6873 | ||
5fd6c1dc | 6874 | j = 0; |
9d88883e | 6875 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6876 | /* resync follows the size requested by the personality, |
57afd89f | 6877 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6878 | */ |
6879 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6880 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6881 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6882 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6883 | j = mddev->resync_min; | |
6884 | else if (!mddev->bitmap) | |
5fd6c1dc | 6885 | j = mddev->recovery_cp; |
5e96ee65 | 6886 | |
ccfcc3c1 | 6887 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6888 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6889 | else { |
1da177e4 | 6890 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6891 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6892 | j = MaxSector; |
4e59ca7d DW |
6893 | rcu_read_lock(); |
6894 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
6895 | if (rdev->raid_disk >= 0 && |
6896 | !test_bit(Faulty, &rdev->flags) && | |
6897 | !test_bit(In_sync, &rdev->flags) && | |
6898 | rdev->recovery_offset < j) | |
6899 | j = rdev->recovery_offset; | |
4e59ca7d | 6900 | rcu_read_unlock(); |
5fd6c1dc | 6901 | } |
1da177e4 | 6902 | |
61df9d91 N |
6903 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6904 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6905 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6906 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6907 | "(but not more than %d KB/sec) for %s.\n", |
6908 | speed_max(mddev), desc); | |
1da177e4 | 6909 | |
eea1bf38 | 6910 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6911 | |
57afd89f | 6912 | io_sectors = 0; |
1da177e4 LT |
6913 | for (m = 0; m < SYNC_MARKS; m++) { |
6914 | mark[m] = jiffies; | |
57afd89f | 6915 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6916 | } |
6917 | last_mark = 0; | |
6918 | mddev->resync_mark = mark[last_mark]; | |
6919 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6920 | ||
6921 | /* | |
6922 | * Tune reconstruction: | |
6923 | */ | |
6924 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
6925 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
6926 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
6927 | |
6928 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6929 | last_check = 0; |
6930 | ||
6931 | if (j>2) { | |
6932 | printk(KERN_INFO | |
61df9d91 N |
6933 | "md: resuming %s of %s from checkpoint.\n", |
6934 | desc, mdname(mddev)); | |
1da177e4 LT |
6935 | mddev->curr_resync = j; |
6936 | } | |
75d3da43 | 6937 | mddev->curr_resync_completed = j; |
1da177e4 LT |
6938 | |
6939 | while (j < max_sectors) { | |
57afd89f | 6940 | sector_t sectors; |
1da177e4 | 6941 | |
57afd89f | 6942 | skipped = 0; |
97e4f42d | 6943 | |
7a91ee1f N |
6944 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6945 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
6946 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6947 | > (max_sectors >> 4)) || | |
6948 | (j - mddev->curr_resync_completed)*2 | |
6949 | >= mddev->resync_max - mddev->curr_resync_completed | |
6950 | )) { | |
97e4f42d | 6951 | /* time to update curr_resync_completed */ |
97e4f42d N |
6952 | wait_event(mddev->recovery_wait, |
6953 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 6954 | mddev->curr_resync_completed = j; |
070dc6dd | 6955 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 6956 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 6957 | } |
acb180b0 | 6958 | |
e62e58a5 N |
6959 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
6960 | /* As this condition is controlled by user-space, | |
6961 | * we can block indefinitely, so use '_interruptible' | |
6962 | * to avoid triggering warnings. | |
6963 | */ | |
6964 | flush_signals(current); /* just in case */ | |
6965 | wait_event_interruptible(mddev->recovery_wait, | |
6966 | mddev->resync_max > j | |
6967 | || kthread_should_stop()); | |
6968 | } | |
acb180b0 N |
6969 | |
6970 | if (kthread_should_stop()) | |
6971 | goto interrupted; | |
6972 | ||
57afd89f | 6973 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6974 | currspeed < speed_min(mddev)); |
57afd89f | 6975 | if (sectors == 0) { |
dfc70645 | 6976 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6977 | goto out; |
6978 | } | |
57afd89f N |
6979 | |
6980 | if (!skipped) { /* actual IO requested */ | |
6981 | io_sectors += sectors; | |
6982 | atomic_add(sectors, &mddev->recovery_active); | |
6983 | } | |
6984 | ||
1da177e4 LT |
6985 | j += sectors; |
6986 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6987 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6988 | if (last_check == 0) |
6989 | /* this is the earliers that rebuilt will be | |
6990 | * visible in /proc/mdstat | |
6991 | */ | |
6992 | md_new_event(mddev); | |
57afd89f N |
6993 | |
6994 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6995 | continue; |
6996 | ||
57afd89f | 6997 | last_check = io_sectors; |
1da177e4 | 6998 | |
dfc70645 | 6999 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
7000 | break; |
7001 | ||
7002 | repeat: | |
7003 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7004 | /* step marks */ | |
7005 | int next = (last_mark+1) % SYNC_MARKS; | |
7006 | ||
7007 | mddev->resync_mark = mark[next]; | |
7008 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7009 | mark[next] = jiffies; | |
57afd89f | 7010 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7011 | last_mark = next; |
7012 | } | |
7013 | ||
7014 | ||
c6207277 N |
7015 | if (kthread_should_stop()) |
7016 | goto interrupted; | |
7017 | ||
1da177e4 LT |
7018 | |
7019 | /* | |
7020 | * this loop exits only if either when we are slower than | |
7021 | * the 'hard' speed limit, or the system was IO-idle for | |
7022 | * a jiffy. | |
7023 | * the system might be non-idle CPU-wise, but we only care | |
7024 | * about not overloading the IO subsystem. (things like an | |
7025 | * e2fsck being done on the RAID array should execute fast) | |
7026 | */ | |
1da177e4 LT |
7027 | cond_resched(); |
7028 | ||
57afd89f N |
7029 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
7030 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 7031 | |
88202a0c N |
7032 | if (currspeed > speed_min(mddev)) { |
7033 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7034 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7035 | msleep(500); |
1da177e4 LT |
7036 | goto repeat; |
7037 | } | |
7038 | } | |
7039 | } | |
61df9d91 | 7040 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
7041 | /* |
7042 | * this also signals 'finished resyncing' to md_stop | |
7043 | */ | |
7044 | out: | |
1da177e4 LT |
7045 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7046 | ||
7047 | /* tell personality that we are finished */ | |
57afd89f | 7048 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7049 | |
dfc70645 | 7050 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7051 | mddev->curr_resync > 2) { |
7052 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7053 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7054 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7055 | printk(KERN_INFO | |
61df9d91 N |
7056 | "md: checkpointing %s of %s.\n", |
7057 | desc, mdname(mddev)); | |
5fd6c1dc N |
7058 | mddev->recovery_cp = mddev->curr_resync; |
7059 | } | |
7060 | } else | |
7061 | mddev->recovery_cp = MaxSector; | |
7062 | } else { | |
7063 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7064 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
7065 | rcu_read_lock(); |
7066 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 7067 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7068 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7069 | !test_bit(Faulty, &rdev->flags) && |
7070 | !test_bit(In_sync, &rdev->flags) && | |
7071 | rdev->recovery_offset < mddev->curr_resync) | |
7072 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7073 | rcu_read_unlock(); |
5fd6c1dc | 7074 | } |
1da177e4 | 7075 | } |
17571284 | 7076 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7077 | |
1da177e4 | 7078 | skip: |
c07b70ad N |
7079 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7080 | /* We completed so min/max setting can be forgotten if used. */ | |
7081 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7082 | mddev->resync_min = 0; | |
7083 | mddev->resync_max = MaxSector; | |
7084 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7085 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7086 | mddev->curr_resync = 0; |
7087 | wake_up(&resync_wait); | |
7088 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7089 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
7090 | return; |
7091 | ||
7092 | interrupted: | |
7093 | /* | |
7094 | * got a signal, exit. | |
7095 | */ | |
7096 | printk(KERN_INFO | |
7097 | "md: md_do_sync() got signal ... exiting\n"); | |
7098 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7099 | goto out; | |
7100 | ||
1da177e4 | 7101 | } |
29269553 | 7102 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7103 | |
b4c4c7b8 N |
7104 | static int remove_and_add_spares(mddev_t *mddev) |
7105 | { | |
7106 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
7107 | int spares = 0; |
7108 | ||
97e4f42d N |
7109 | mddev->curr_resync_completed = 0; |
7110 | ||
159ec1fc | 7111 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 7112 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 7113 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7114 | (test_bit(Faulty, &rdev->flags) || |
7115 | ! test_bit(In_sync, &rdev->flags)) && | |
7116 | atomic_read(&rdev->nr_pending)==0) { | |
7117 | if (mddev->pers->hot_remove_disk( | |
7118 | mddev, rdev->raid_disk)==0) { | |
36fad858 | 7119 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 N |
7120 | rdev->raid_disk = -1; |
7121 | } | |
7122 | } | |
7123 | ||
5389042f | 7124 | if (mddev->degraded) { |
159ec1fc | 7125 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 7126 | if (rdev->raid_disk >= 0 && |
e5427135 | 7127 | !test_bit(In_sync, &rdev->flags) && |
4274215d | 7128 | !test_bit(Faulty, &rdev->flags) && |
e5427135 | 7129 | !test_bit(Blocked, &rdev->flags)) |
dfc70645 | 7130 | spares++; |
b4c4c7b8 N |
7131 | if (rdev->raid_disk < 0 |
7132 | && !test_bit(Faulty, &rdev->flags)) { | |
7133 | rdev->recovery_offset = 0; | |
199050ea NB |
7134 | if (mddev->pers-> |
7135 | hot_add_disk(mddev, rdev) == 0) { | |
36fad858 | 7136 | if (sysfs_link_rdev(mddev, rdev)) |
00bcb4ac | 7137 | /* failure here is OK */; |
b4c4c7b8 N |
7138 | spares++; |
7139 | md_new_event(mddev); | |
93be75ff | 7140 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
7141 | } else |
7142 | break; | |
7143 | } | |
dfc70645 | 7144 | } |
b4c4c7b8 N |
7145 | } |
7146 | return spares; | |
7147 | } | |
7ebc0be7 N |
7148 | |
7149 | static void reap_sync_thread(mddev_t *mddev) | |
7150 | { | |
7151 | mdk_rdev_t *rdev; | |
7152 | ||
7153 | /* resync has finished, collect result */ | |
7154 | md_unregister_thread(mddev->sync_thread); | |
7155 | mddev->sync_thread = NULL; | |
7156 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7157 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7158 | /* success...*/ | |
7159 | /* activate any spares */ | |
7160 | if (mddev->pers->spare_active(mddev)) | |
7161 | sysfs_notify(&mddev->kobj, NULL, | |
7162 | "degraded"); | |
7163 | } | |
7164 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7165 | mddev->pers->finish_reshape) | |
7166 | mddev->pers->finish_reshape(mddev); | |
7167 | md_update_sb(mddev, 1); | |
7168 | ||
7169 | /* if array is no-longer degraded, then any saved_raid_disk | |
7170 | * information must be scrapped | |
7171 | */ | |
7172 | if (!mddev->degraded) | |
7173 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
7174 | rdev->saved_raid_disk = -1; | |
7175 | ||
7176 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7177 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7178 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7179 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7180 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7181 | /* flag recovery needed just to double check */ | |
7182 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7183 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7184 | md_new_event(mddev); | |
768e587e JB |
7185 | if (mddev->event_work.func) |
7186 | queue_work(md_misc_wq, &mddev->event_work); | |
7ebc0be7 N |
7187 | } |
7188 | ||
1da177e4 LT |
7189 | /* |
7190 | * This routine is regularly called by all per-raid-array threads to | |
7191 | * deal with generic issues like resync and super-block update. | |
7192 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7193 | * need this as they never do any recovery or update the superblock. | |
7194 | * | |
7195 | * It does not do any resync itself, but rather "forks" off other threads | |
7196 | * to do that as needed. | |
7197 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7198 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7199 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7200 | * and wakeups up this thread which will reap the thread and finish up. |
7201 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7202 | * | |
7203 | * The overall approach is: | |
7204 | * 1/ if the superblock needs updating, update it. | |
7205 | * 2/ If a recovery thread is running, don't do anything else. | |
7206 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7207 | * 4/ If there are any faulty devices, remove them. | |
7208 | * 5/ If array is degraded, try to add spares devices | |
7209 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7210 | */ | |
7211 | void md_check_recovery(mddev_t *mddev) | |
7212 | { | |
68866e42 JB |
7213 | if (mddev->suspended) |
7214 | return; | |
7215 | ||
5f40402d | 7216 | if (mddev->bitmap) |
aa5cbd10 | 7217 | bitmap_daemon_work(mddev); |
1da177e4 | 7218 | |
fca4d848 | 7219 | if (signal_pending(current)) { |
31a59e34 | 7220 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7221 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7222 | mdname(mddev)); | |
7223 | mddev->safemode = 2; | |
7224 | } | |
7225 | flush_signals(current); | |
7226 | } | |
7227 | ||
c89a8eee N |
7228 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7229 | return; | |
1da177e4 | 7230 | if ( ! ( |
126925c0 | 7231 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7232 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7233 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7234 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7235 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7236 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7237 | )) |
7238 | return; | |
fca4d848 | 7239 | |
df5b89b3 | 7240 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7241 | int spares = 0; |
fca4d848 | 7242 | |
c89a8eee N |
7243 | if (mddev->ro) { |
7244 | /* Only thing we do on a ro array is remove | |
7245 | * failed devices. | |
7246 | */ | |
a8c42c7f N |
7247 | mdk_rdev_t *rdev; |
7248 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
7249 | if (rdev->raid_disk >= 0 && | |
7250 | !test_bit(Blocked, &rdev->flags) && | |
7251 | test_bit(Faulty, &rdev->flags) && | |
7252 | atomic_read(&rdev->nr_pending)==0) { | |
7253 | if (mddev->pers->hot_remove_disk( | |
7254 | mddev, rdev->raid_disk)==0) { | |
36fad858 | 7255 | sysfs_unlink_rdev(mddev, rdev); |
a8c42c7f N |
7256 | rdev->raid_disk = -1; |
7257 | } | |
7258 | } | |
c89a8eee N |
7259 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7260 | goto unlock; | |
7261 | } | |
7262 | ||
31a59e34 | 7263 | if (!mddev->external) { |
0fd62b86 | 7264 | int did_change = 0; |
31a59e34 N |
7265 | spin_lock_irq(&mddev->write_lock); |
7266 | if (mddev->safemode && | |
7267 | !atomic_read(&mddev->writes_pending) && | |
7268 | !mddev->in_sync && | |
7269 | mddev->recovery_cp == MaxSector) { | |
7270 | mddev->in_sync = 1; | |
0fd62b86 | 7271 | did_change = 1; |
070dc6dd | 7272 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7273 | } |
7274 | if (mddev->safemode == 1) | |
7275 | mddev->safemode = 0; | |
7276 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7277 | if (did_change) |
00bcb4ac | 7278 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7279 | } |
fca4d848 | 7280 | |
850b2b42 N |
7281 | if (mddev->flags) |
7282 | md_update_sb(mddev, 0); | |
06d91a5f | 7283 | |
1da177e4 LT |
7284 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7285 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7286 | /* resync/recovery still happening */ | |
7287 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7288 | goto unlock; | |
7289 | } | |
7290 | if (mddev->sync_thread) { | |
7ebc0be7 | 7291 | reap_sync_thread(mddev); |
1da177e4 LT |
7292 | goto unlock; |
7293 | } | |
72a23c21 NB |
7294 | /* Set RUNNING before clearing NEEDED to avoid |
7295 | * any transients in the value of "sync_action". | |
7296 | */ | |
7297 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7298 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7299 | /* Clear some bits that don't mean anything, but |
7300 | * might be left set | |
7301 | */ | |
24dd469d N |
7302 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7303 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7304 | |
5fd6c1dc N |
7305 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7306 | goto unlock; | |
1da177e4 LT |
7307 | /* no recovery is running. |
7308 | * remove any failed drives, then | |
7309 | * add spares if possible. | |
7310 | * Spare are also removed and re-added, to allow | |
7311 | * the personality to fail the re-add. | |
7312 | */ | |
1da177e4 | 7313 | |
b4c4c7b8 | 7314 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7315 | if (mddev->pers->check_reshape == NULL || |
7316 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7317 | /* Cannot proceed */ |
7318 | goto unlock; | |
7319 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7320 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7321 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7322 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7323 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7324 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7325 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7326 | } else if (mddev->recovery_cp < MaxSector) { |
7327 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7328 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7329 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7330 | /* nothing to be done ... */ | |
1da177e4 | 7331 | goto unlock; |
24dd469d | 7332 | |
1da177e4 | 7333 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7334 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7335 | /* We are adding a device or devices to an array | |
7336 | * which has the bitmap stored on all devices. | |
7337 | * So make sure all bitmap pages get written | |
7338 | */ | |
7339 | bitmap_write_all(mddev->bitmap); | |
7340 | } | |
1da177e4 LT |
7341 | mddev->sync_thread = md_register_thread(md_do_sync, |
7342 | mddev, | |
0da3c619 | 7343 | "resync"); |
1da177e4 LT |
7344 | if (!mddev->sync_thread) { |
7345 | printk(KERN_ERR "%s: could not start resync" | |
7346 | " thread...\n", | |
7347 | mdname(mddev)); | |
7348 | /* leave the spares where they are, it shouldn't hurt */ | |
7ebc0be7 N |
7349 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7350 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7351 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7352 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7353 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
d7603b7e | 7354 | } else |
1da177e4 | 7355 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7356 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7357 | md_new_event(mddev); |
1da177e4 LT |
7358 | } |
7359 | unlock: | |
72a23c21 NB |
7360 | if (!mddev->sync_thread) { |
7361 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7362 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7363 | &mddev->recovery)) | |
0c3573f1 | 7364 | if (mddev->sysfs_action) |
00bcb4ac | 7365 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7366 | } |
1da177e4 LT |
7367 | mddev_unlock(mddev); |
7368 | } | |
7369 | } | |
7370 | ||
6bfe0b49 DW |
7371 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
7372 | { | |
00bcb4ac | 7373 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 DW |
7374 | wait_event_timeout(rdev->blocked_wait, |
7375 | !test_bit(Blocked, &rdev->flags), | |
7376 | msecs_to_jiffies(5000)); | |
7377 | rdev_dec_pending(rdev, mddev); | |
7378 | } | |
7379 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7380 | ||
2230dfe4 N |
7381 | |
7382 | /* Bad block management. | |
7383 | * We can record which blocks on each device are 'bad' and so just | |
7384 | * fail those blocks, or that stripe, rather than the whole device. | |
7385 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7386 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7387 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7388 | * A 'shift' can be set so that larger blocks are tracked and | |
7389 | * consequently larger devices can be covered. | |
7390 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7391 | * | |
7392 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7393 | * might need to retry if it is very unlucky. | |
7394 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7395 | * so we use the write_seqlock_irq variant. | |
7396 | * | |
7397 | * When looking for a bad block we specify a range and want to | |
7398 | * know if any block in the range is bad. So we binary-search | |
7399 | * to the last range that starts at-or-before the given endpoint, | |
7400 | * (or "before the sector after the target range") | |
7401 | * then see if it ends after the given start. | |
7402 | * We return | |
7403 | * 0 if there are no known bad blocks in the range | |
7404 | * 1 if there are known bad block which are all acknowledged | |
7405 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
7406 | * plus the start/length of the first bad section we overlap. | |
7407 | */ | |
7408 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
7409 | sector_t *first_bad, int *bad_sectors) | |
7410 | { | |
7411 | int hi; | |
7412 | int lo = 0; | |
7413 | u64 *p = bb->page; | |
7414 | int rv = 0; | |
7415 | sector_t target = s + sectors; | |
7416 | unsigned seq; | |
7417 | ||
7418 | if (bb->shift > 0) { | |
7419 | /* round the start down, and the end up */ | |
7420 | s >>= bb->shift; | |
7421 | target += (1<<bb->shift) - 1; | |
7422 | target >>= bb->shift; | |
7423 | sectors = target - s; | |
7424 | } | |
7425 | /* 'target' is now the first block after the bad range */ | |
7426 | ||
7427 | retry: | |
7428 | seq = read_seqbegin(&bb->lock); | |
7429 | ||
7430 | hi = bb->count; | |
7431 | ||
7432 | /* Binary search between lo and hi for 'target' | |
7433 | * i.e. for the last range that starts before 'target' | |
7434 | */ | |
7435 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
7436 | * are known not to be the last range before target. | |
7437 | * VARIANT: hi-lo is the number of possible | |
7438 | * ranges, and decreases until it reaches 1 | |
7439 | */ | |
7440 | while (hi - lo > 1) { | |
7441 | int mid = (lo + hi) / 2; | |
7442 | sector_t a = BB_OFFSET(p[mid]); | |
7443 | if (a < target) | |
7444 | /* This could still be the one, earlier ranges | |
7445 | * could not. */ | |
7446 | lo = mid; | |
7447 | else | |
7448 | /* This and later ranges are definitely out. */ | |
7449 | hi = mid; | |
7450 | } | |
7451 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
7452 | if (hi > lo) { | |
7453 | /* need to check all range that end after 's' to see if | |
7454 | * any are unacknowledged. | |
7455 | */ | |
7456 | while (lo >= 0 && | |
7457 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7458 | if (BB_OFFSET(p[lo]) < target) { | |
7459 | /* starts before the end, and finishes after | |
7460 | * the start, so they must overlap | |
7461 | */ | |
7462 | if (rv != -1 && BB_ACK(p[lo])) | |
7463 | rv = 1; | |
7464 | else | |
7465 | rv = -1; | |
7466 | *first_bad = BB_OFFSET(p[lo]); | |
7467 | *bad_sectors = BB_LEN(p[lo]); | |
7468 | } | |
7469 | lo--; | |
7470 | } | |
7471 | } | |
7472 | ||
7473 | if (read_seqretry(&bb->lock, seq)) | |
7474 | goto retry; | |
7475 | ||
7476 | return rv; | |
7477 | } | |
7478 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
7479 | ||
7480 | /* | |
7481 | * Add a range of bad blocks to the table. | |
7482 | * This might extend the table, or might contract it | |
7483 | * if two adjacent ranges can be merged. | |
7484 | * We binary-search to find the 'insertion' point, then | |
7485 | * decide how best to handle it. | |
7486 | */ | |
7487 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
7488 | int acknowledged) | |
7489 | { | |
7490 | u64 *p; | |
7491 | int lo, hi; | |
7492 | int rv = 1; | |
7493 | ||
7494 | if (bb->shift < 0) | |
7495 | /* badblocks are disabled */ | |
7496 | return 0; | |
7497 | ||
7498 | if (bb->shift) { | |
7499 | /* round the start down, and the end up */ | |
7500 | sector_t next = s + sectors; | |
7501 | s >>= bb->shift; | |
7502 | next += (1<<bb->shift) - 1; | |
7503 | next >>= bb->shift; | |
7504 | sectors = next - s; | |
7505 | } | |
7506 | ||
7507 | write_seqlock_irq(&bb->lock); | |
7508 | ||
7509 | p = bb->page; | |
7510 | lo = 0; | |
7511 | hi = bb->count; | |
7512 | /* Find the last range that starts at-or-before 's' */ | |
7513 | while (hi - lo > 1) { | |
7514 | int mid = (lo + hi) / 2; | |
7515 | sector_t a = BB_OFFSET(p[mid]); | |
7516 | if (a <= s) | |
7517 | lo = mid; | |
7518 | else | |
7519 | hi = mid; | |
7520 | } | |
7521 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
7522 | hi = lo; | |
7523 | ||
7524 | if (hi > lo) { | |
7525 | /* we found a range that might merge with the start | |
7526 | * of our new range | |
7527 | */ | |
7528 | sector_t a = BB_OFFSET(p[lo]); | |
7529 | sector_t e = a + BB_LEN(p[lo]); | |
7530 | int ack = BB_ACK(p[lo]); | |
7531 | if (e >= s) { | |
7532 | /* Yes, we can merge with a previous range */ | |
7533 | if (s == a && s + sectors >= e) | |
7534 | /* new range covers old */ | |
7535 | ack = acknowledged; | |
7536 | else | |
7537 | ack = ack && acknowledged; | |
7538 | ||
7539 | if (e < s + sectors) | |
7540 | e = s + sectors; | |
7541 | if (e - a <= BB_MAX_LEN) { | |
7542 | p[lo] = BB_MAKE(a, e-a, ack); | |
7543 | s = e; | |
7544 | } else { | |
7545 | /* does not all fit in one range, | |
7546 | * make p[lo] maximal | |
7547 | */ | |
7548 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
7549 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
7550 | s = a + BB_MAX_LEN; | |
7551 | } | |
7552 | sectors = e - s; | |
7553 | } | |
7554 | } | |
7555 | if (sectors && hi < bb->count) { | |
7556 | /* 'hi' points to the first range that starts after 's'. | |
7557 | * Maybe we can merge with the start of that range */ | |
7558 | sector_t a = BB_OFFSET(p[hi]); | |
7559 | sector_t e = a + BB_LEN(p[hi]); | |
7560 | int ack = BB_ACK(p[hi]); | |
7561 | if (a <= s + sectors) { | |
7562 | /* merging is possible */ | |
7563 | if (e <= s + sectors) { | |
7564 | /* full overlap */ | |
7565 | e = s + sectors; | |
7566 | ack = acknowledged; | |
7567 | } else | |
7568 | ack = ack && acknowledged; | |
7569 | ||
7570 | a = s; | |
7571 | if (e - a <= BB_MAX_LEN) { | |
7572 | p[hi] = BB_MAKE(a, e-a, ack); | |
7573 | s = e; | |
7574 | } else { | |
7575 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
7576 | s = a + BB_MAX_LEN; | |
7577 | } | |
7578 | sectors = e - s; | |
7579 | lo = hi; | |
7580 | hi++; | |
7581 | } | |
7582 | } | |
7583 | if (sectors == 0 && hi < bb->count) { | |
7584 | /* we might be able to combine lo and hi */ | |
7585 | /* Note: 's' is at the end of 'lo' */ | |
7586 | sector_t a = BB_OFFSET(p[hi]); | |
7587 | int lolen = BB_LEN(p[lo]); | |
7588 | int hilen = BB_LEN(p[hi]); | |
7589 | int newlen = lolen + hilen - (s - a); | |
7590 | if (s >= a && newlen < BB_MAX_LEN) { | |
7591 | /* yes, we can combine them */ | |
7592 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
7593 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
7594 | memmove(p + hi, p + hi + 1, | |
7595 | (bb->count - hi - 1) * 8); | |
7596 | bb->count--; | |
7597 | } | |
7598 | } | |
7599 | while (sectors) { | |
7600 | /* didn't merge (it all). | |
7601 | * Need to add a range just before 'hi' */ | |
7602 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
7603 | /* No room for more */ | |
7604 | rv = 0; | |
7605 | break; | |
7606 | } else { | |
7607 | int this_sectors = sectors; | |
7608 | memmove(p + hi + 1, p + hi, | |
7609 | (bb->count - hi) * 8); | |
7610 | bb->count++; | |
7611 | ||
7612 | if (this_sectors > BB_MAX_LEN) | |
7613 | this_sectors = BB_MAX_LEN; | |
7614 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
7615 | sectors -= this_sectors; | |
7616 | s += this_sectors; | |
7617 | } | |
7618 | } | |
7619 | ||
7620 | bb->changed = 1; | |
7621 | write_sequnlock_irq(&bb->lock); | |
7622 | ||
7623 | return rv; | |
7624 | } | |
7625 | ||
7626 | int rdev_set_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors, | |
7627 | int acknowledged) | |
7628 | { | |
7629 | int rv = md_set_badblocks(&rdev->badblocks, | |
7630 | s + rdev->data_offset, sectors, acknowledged); | |
7631 | if (rv) { | |
7632 | /* Make sure they get written out promptly */ | |
7633 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); | |
7634 | md_wakeup_thread(rdev->mddev->thread); | |
7635 | } | |
7636 | return rv; | |
7637 | } | |
7638 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
7639 | ||
7640 | /* | |
7641 | * Remove a range of bad blocks from the table. | |
7642 | * This may involve extending the table if we spilt a region, | |
7643 | * but it must not fail. So if the table becomes full, we just | |
7644 | * drop the remove request. | |
7645 | */ | |
7646 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
7647 | { | |
7648 | u64 *p; | |
7649 | int lo, hi; | |
7650 | sector_t target = s + sectors; | |
7651 | int rv = 0; | |
7652 | ||
7653 | if (bb->shift > 0) { | |
7654 | /* When clearing we round the start up and the end down. | |
7655 | * This should not matter as the shift should align with | |
7656 | * the block size and no rounding should ever be needed. | |
7657 | * However it is better the think a block is bad when it | |
7658 | * isn't than to think a block is not bad when it is. | |
7659 | */ | |
7660 | s += (1<<bb->shift) - 1; | |
7661 | s >>= bb->shift; | |
7662 | target >>= bb->shift; | |
7663 | sectors = target - s; | |
7664 | } | |
7665 | ||
7666 | write_seqlock_irq(&bb->lock); | |
7667 | ||
7668 | p = bb->page; | |
7669 | lo = 0; | |
7670 | hi = bb->count; | |
7671 | /* Find the last range that starts before 'target' */ | |
7672 | while (hi - lo > 1) { | |
7673 | int mid = (lo + hi) / 2; | |
7674 | sector_t a = BB_OFFSET(p[mid]); | |
7675 | if (a < target) | |
7676 | lo = mid; | |
7677 | else | |
7678 | hi = mid; | |
7679 | } | |
7680 | if (hi > lo) { | |
7681 | /* p[lo] is the last range that could overlap the | |
7682 | * current range. Earlier ranges could also overlap, | |
7683 | * but only this one can overlap the end of the range. | |
7684 | */ | |
7685 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
7686 | /* Partial overlap, leave the tail of this range */ | |
7687 | int ack = BB_ACK(p[lo]); | |
7688 | sector_t a = BB_OFFSET(p[lo]); | |
7689 | sector_t end = a + BB_LEN(p[lo]); | |
7690 | ||
7691 | if (a < s) { | |
7692 | /* we need to split this range */ | |
7693 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
7694 | rv = 0; | |
7695 | goto out; | |
7696 | } | |
7697 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
7698 | bb->count++; | |
7699 | p[lo] = BB_MAKE(a, s-a, ack); | |
7700 | lo++; | |
7701 | } | |
7702 | p[lo] = BB_MAKE(target, end - target, ack); | |
7703 | /* there is no longer an overlap */ | |
7704 | hi = lo; | |
7705 | lo--; | |
7706 | } | |
7707 | while (lo >= 0 && | |
7708 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7709 | /* This range does overlap */ | |
7710 | if (BB_OFFSET(p[lo]) < s) { | |
7711 | /* Keep the early parts of this range. */ | |
7712 | int ack = BB_ACK(p[lo]); | |
7713 | sector_t start = BB_OFFSET(p[lo]); | |
7714 | p[lo] = BB_MAKE(start, s - start, ack); | |
7715 | /* now low doesn't overlap, so.. */ | |
7716 | break; | |
7717 | } | |
7718 | lo--; | |
7719 | } | |
7720 | /* 'lo' is strictly before, 'hi' is strictly after, | |
7721 | * anything between needs to be discarded | |
7722 | */ | |
7723 | if (hi - lo > 1) { | |
7724 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
7725 | bb->count -= (hi - lo - 1); | |
7726 | } | |
7727 | } | |
7728 | ||
7729 | bb->changed = 1; | |
7730 | out: | |
7731 | write_sequnlock_irq(&bb->lock); | |
7732 | return rv; | |
7733 | } | |
7734 | ||
7735 | int rdev_clear_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors) | |
7736 | { | |
7737 | return md_clear_badblocks(&rdev->badblocks, | |
7738 | s + rdev->data_offset, | |
7739 | sectors); | |
7740 | } | |
7741 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
7742 | ||
7743 | /* | |
7744 | * Acknowledge all bad blocks in a list. | |
7745 | * This only succeeds if ->changed is clear. It is used by | |
7746 | * in-kernel metadata updates | |
7747 | */ | |
7748 | void md_ack_all_badblocks(struct badblocks *bb) | |
7749 | { | |
7750 | if (bb->page == NULL || bb->changed) | |
7751 | /* no point even trying */ | |
7752 | return; | |
7753 | write_seqlock_irq(&bb->lock); | |
7754 | ||
7755 | if (bb->changed == 0) { | |
7756 | u64 *p = bb->page; | |
7757 | int i; | |
7758 | for (i = 0; i < bb->count ; i++) { | |
7759 | if (!BB_ACK(p[i])) { | |
7760 | sector_t start = BB_OFFSET(p[i]); | |
7761 | int len = BB_LEN(p[i]); | |
7762 | p[i] = BB_MAKE(start, len, 1); | |
7763 | } | |
7764 | } | |
7765 | } | |
7766 | write_sequnlock_irq(&bb->lock); | |
7767 | } | |
7768 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
7769 | ||
16c791a5 N |
7770 | /* sysfs access to bad-blocks list. |
7771 | * We present two files. | |
7772 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
7773 | * are recorded as bad. The list is truncated to fit within | |
7774 | * the one-page limit of sysfs. | |
7775 | * Writing "sector length" to this file adds an acknowledged | |
7776 | * bad block list. | |
7777 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
7778 | * been acknowledged. Writing to this file adds bad blocks | |
7779 | * without acknowledging them. This is largely for testing. | |
7780 | */ | |
7781 | ||
7782 | static ssize_t | |
7783 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
7784 | { | |
7785 | size_t len; | |
7786 | int i; | |
7787 | u64 *p = bb->page; | |
7788 | unsigned seq; | |
7789 | ||
7790 | if (bb->shift < 0) | |
7791 | return 0; | |
7792 | ||
7793 | retry: | |
7794 | seq = read_seqbegin(&bb->lock); | |
7795 | ||
7796 | len = 0; | |
7797 | i = 0; | |
7798 | ||
7799 | while (len < PAGE_SIZE && i < bb->count) { | |
7800 | sector_t s = BB_OFFSET(p[i]); | |
7801 | unsigned int length = BB_LEN(p[i]); | |
7802 | int ack = BB_ACK(p[i]); | |
7803 | i++; | |
7804 | ||
7805 | if (unack && ack) | |
7806 | continue; | |
7807 | ||
7808 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
7809 | (unsigned long long)s << bb->shift, | |
7810 | length << bb->shift); | |
7811 | } | |
7812 | ||
7813 | if (read_seqretry(&bb->lock, seq)) | |
7814 | goto retry; | |
7815 | ||
7816 | return len; | |
7817 | } | |
7818 | ||
7819 | #define DO_DEBUG 1 | |
7820 | ||
7821 | static ssize_t | |
7822 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
7823 | { | |
7824 | unsigned long long sector; | |
7825 | int length; | |
7826 | char newline; | |
7827 | #ifdef DO_DEBUG | |
7828 | /* Allow clearing via sysfs *only* for testing/debugging. | |
7829 | * Normally only a successful write may clear a badblock | |
7830 | */ | |
7831 | int clear = 0; | |
7832 | if (page[0] == '-') { | |
7833 | clear = 1; | |
7834 | page++; | |
7835 | } | |
7836 | #endif /* DO_DEBUG */ | |
7837 | ||
7838 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
7839 | case 3: | |
7840 | if (newline != '\n') | |
7841 | return -EINVAL; | |
7842 | case 2: | |
7843 | if (length <= 0) | |
7844 | return -EINVAL; | |
7845 | break; | |
7846 | default: | |
7847 | return -EINVAL; | |
7848 | } | |
7849 | ||
7850 | #ifdef DO_DEBUG | |
7851 | if (clear) { | |
7852 | md_clear_badblocks(bb, sector, length); | |
7853 | return len; | |
7854 | } | |
7855 | #endif /* DO_DEBUG */ | |
7856 | if (md_set_badblocks(bb, sector, length, !unack)) | |
7857 | return len; | |
7858 | else | |
7859 | return -ENOSPC; | |
7860 | } | |
7861 | ||
75c96f85 AB |
7862 | static int md_notify_reboot(struct notifier_block *this, |
7863 | unsigned long code, void *x) | |
1da177e4 LT |
7864 | { |
7865 | struct list_head *tmp; | |
7866 | mddev_t *mddev; | |
7867 | ||
7868 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
7869 | ||
7870 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
7871 | ||
29ac4aa3 | 7872 | for_each_mddev(mddev, tmp) |
c71d4887 | 7873 | if (mddev_trylock(mddev)) { |
2b25000b N |
7874 | /* Force a switch to readonly even array |
7875 | * appears to still be in use. Hence | |
7876 | * the '100'. | |
7877 | */ | |
a4bd82d0 | 7878 | md_set_readonly(mddev, 100); |
c71d4887 NB |
7879 | mddev_unlock(mddev); |
7880 | } | |
1da177e4 LT |
7881 | /* |
7882 | * certain more exotic SCSI devices are known to be | |
7883 | * volatile wrt too early system reboots. While the | |
7884 | * right place to handle this issue is the given | |
7885 | * driver, we do want to have a safe RAID driver ... | |
7886 | */ | |
7887 | mdelay(1000*1); | |
7888 | } | |
7889 | return NOTIFY_DONE; | |
7890 | } | |
7891 | ||
75c96f85 | 7892 | static struct notifier_block md_notifier = { |
1da177e4 LT |
7893 | .notifier_call = md_notify_reboot, |
7894 | .next = NULL, | |
7895 | .priority = INT_MAX, /* before any real devices */ | |
7896 | }; | |
7897 | ||
7898 | static void md_geninit(void) | |
7899 | { | |
1da177e4 LT |
7900 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
7901 | ||
c7705f34 | 7902 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
7903 | } |
7904 | ||
75c96f85 | 7905 | static int __init md_init(void) |
1da177e4 | 7906 | { |
e804ac78 TH |
7907 | int ret = -ENOMEM; |
7908 | ||
ada609ee | 7909 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
7910 | if (!md_wq) |
7911 | goto err_wq; | |
7912 | ||
7913 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
7914 | if (!md_misc_wq) | |
7915 | goto err_misc_wq; | |
7916 | ||
7917 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
7918 | goto err_md; | |
7919 | ||
7920 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
7921 | goto err_mdp; | |
7922 | mdp_major = ret; | |
7923 | ||
3dbd8c2e | 7924 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
7925 | md_probe, NULL, NULL); |
7926 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
7927 | md_probe, NULL, NULL); |
7928 | ||
1da177e4 | 7929 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 7930 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
7931 | |
7932 | md_geninit(); | |
d710e138 | 7933 | return 0; |
1da177e4 | 7934 | |
e804ac78 TH |
7935 | err_mdp: |
7936 | unregister_blkdev(MD_MAJOR, "md"); | |
7937 | err_md: | |
7938 | destroy_workqueue(md_misc_wq); | |
7939 | err_misc_wq: | |
7940 | destroy_workqueue(md_wq); | |
7941 | err_wq: | |
7942 | return ret; | |
7943 | } | |
1da177e4 LT |
7944 | |
7945 | #ifndef MODULE | |
7946 | ||
7947 | /* | |
7948 | * Searches all registered partitions for autorun RAID arrays | |
7949 | * at boot time. | |
7950 | */ | |
4d936ec1 ME |
7951 | |
7952 | static LIST_HEAD(all_detected_devices); | |
7953 | struct detected_devices_node { | |
7954 | struct list_head list; | |
7955 | dev_t dev; | |
7956 | }; | |
1da177e4 LT |
7957 | |
7958 | void md_autodetect_dev(dev_t dev) | |
7959 | { | |
4d936ec1 ME |
7960 | struct detected_devices_node *node_detected_dev; |
7961 | ||
7962 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
7963 | if (node_detected_dev) { | |
7964 | node_detected_dev->dev = dev; | |
7965 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
7966 | } else { | |
7967 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
7968 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
7969 | } | |
1da177e4 LT |
7970 | } |
7971 | ||
7972 | ||
7973 | static void autostart_arrays(int part) | |
7974 | { | |
7975 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
7976 | struct detected_devices_node *node_detected_dev; |
7977 | dev_t dev; | |
7978 | int i_scanned, i_passed; | |
1da177e4 | 7979 | |
4d936ec1 ME |
7980 | i_scanned = 0; |
7981 | i_passed = 0; | |
1da177e4 | 7982 | |
4d936ec1 | 7983 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 7984 | |
4d936ec1 ME |
7985 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
7986 | i_scanned++; | |
7987 | node_detected_dev = list_entry(all_detected_devices.next, | |
7988 | struct detected_devices_node, list); | |
7989 | list_del(&node_detected_dev->list); | |
7990 | dev = node_detected_dev->dev; | |
7991 | kfree(node_detected_dev); | |
df968c4e | 7992 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
7993 | if (IS_ERR(rdev)) |
7994 | continue; | |
7995 | ||
b2d444d7 | 7996 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7997 | MD_BUG(); |
7998 | continue; | |
7999 | } | |
d0fae18f | 8000 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8001 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8002 | i_passed++; |
1da177e4 | 8003 | } |
4d936ec1 ME |
8004 | |
8005 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8006 | i_scanned, i_passed); | |
1da177e4 LT |
8007 | |
8008 | autorun_devices(part); | |
8009 | } | |
8010 | ||
fdee8ae4 | 8011 | #endif /* !MODULE */ |
1da177e4 LT |
8012 | |
8013 | static __exit void md_exit(void) | |
8014 | { | |
8015 | mddev_t *mddev; | |
8016 | struct list_head *tmp; | |
8ab5e4c1 | 8017 | |
3dbd8c2e | 8018 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 8019 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8020 | |
3dbd8c2e | 8021 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8022 | unregister_blkdev(mdp_major, "mdp"); |
8023 | unregister_reboot_notifier(&md_notifier); | |
8024 | unregister_sysctl_table(raid_table_header); | |
8025 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 8026 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8027 | export_array(mddev); |
d3374825 | 8028 | mddev->hold_active = 0; |
1da177e4 | 8029 | } |
e804ac78 TH |
8030 | destroy_workqueue(md_misc_wq); |
8031 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8032 | } |
8033 | ||
685784aa | 8034 | subsys_initcall(md_init); |
1da177e4 LT |
8035 | module_exit(md_exit) |
8036 | ||
f91de92e N |
8037 | static int get_ro(char *buffer, struct kernel_param *kp) |
8038 | { | |
8039 | return sprintf(buffer, "%d", start_readonly); | |
8040 | } | |
8041 | static int set_ro(const char *val, struct kernel_param *kp) | |
8042 | { | |
8043 | char *e; | |
8044 | int num = simple_strtoul(val, &e, 10); | |
8045 | if (*val && (*e == '\0' || *e == '\n')) { | |
8046 | start_readonly = num; | |
4dbcdc75 | 8047 | return 0; |
f91de92e N |
8048 | } |
8049 | return -EINVAL; | |
8050 | } | |
8051 | ||
80ca3a44 N |
8052 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8053 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 8054 | |
efeb53c0 | 8055 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8056 | |
1da177e4 LT |
8057 | EXPORT_SYMBOL(register_md_personality); |
8058 | EXPORT_SYMBOL(unregister_md_personality); | |
8059 | EXPORT_SYMBOL(md_error); | |
8060 | EXPORT_SYMBOL(md_done_sync); | |
8061 | EXPORT_SYMBOL(md_write_start); | |
8062 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
8063 | EXPORT_SYMBOL(md_register_thread); |
8064 | EXPORT_SYMBOL(md_unregister_thread); | |
8065 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
8066 | EXPORT_SYMBOL(md_check_recovery); |
8067 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8068 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8069 | MODULE_ALIAS("md"); |
72008652 | 8070 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |