Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
2a48fc0a | 39 | #include <linux/mutex.h> |
1da177e4 | 40 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 41 | #include <linux/poll.h> |
16f17b39 | 42 | #include <linux/ctype.h> |
e7d2860b | 43 | #include <linux/string.h> |
fb4d8c76 N |
44 | #include <linux/hdreg.h> |
45 | #include <linux/proc_fs.h> | |
46 | #include <linux/random.h> | |
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 | 759 | } |
2699b672 N |
760 | if (rdev->bb_page) { |
761 | put_page(rdev->bb_page); | |
762 | rdev->bb_page = NULL; | |
763 | } | |
1da177e4 LT |
764 | } |
765 | ||
766 | ||
6712ecf8 | 767 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
768 | { |
769 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 770 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 771 | |
3a0f5bbb N |
772 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
773 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
774 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
775 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 776 | md_error(mddev, rdev); |
3a0f5bbb | 777 | } |
7bfa19f2 | 778 | |
a9701a30 N |
779 | if (atomic_dec_and_test(&mddev->pending_writes)) |
780 | wake_up(&mddev->sb_wait); | |
f8b58edf | 781 | bio_put(bio); |
7bfa19f2 N |
782 | } |
783 | ||
784 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, | |
785 | sector_t sector, int size, struct page *page) | |
786 | { | |
787 | /* write first size bytes of page to sector of rdev | |
788 | * Increment mddev->pending_writes before returning | |
789 | * and decrement it on completion, waking up sb_wait | |
790 | * if zero is reached. | |
791 | * If an error occurred, call md_error | |
792 | */ | |
a167f663 | 793 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, mddev); |
7bfa19f2 | 794 | |
a6ff7e08 | 795 | bio->bi_bdev = rdev->meta_bdev ? rdev->meta_bdev : rdev->bdev; |
7bfa19f2 N |
796 | bio->bi_sector = sector; |
797 | bio_add_page(bio, page, size, 0); | |
798 | bio->bi_private = rdev; | |
799 | bio->bi_end_io = super_written; | |
a9701a30 | 800 | |
7bfa19f2 | 801 | atomic_inc(&mddev->pending_writes); |
721a9602 | 802 | submit_bio(REQ_WRITE | REQ_SYNC | REQ_FLUSH | REQ_FUA, bio); |
a9701a30 N |
803 | } |
804 | ||
805 | void md_super_wait(mddev_t *mddev) | |
806 | { | |
e9c7469b | 807 | /* wait for all superblock writes that were scheduled to complete */ |
a9701a30 N |
808 | DEFINE_WAIT(wq); |
809 | for(;;) { | |
810 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
811 | if (atomic_read(&mddev->pending_writes)==0) | |
812 | break; | |
a9701a30 N |
813 | schedule(); |
814 | } | |
815 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
816 | } |
817 | ||
6712ecf8 | 818 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 819 | { |
1da177e4 | 820 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
821 | } |
822 | ||
2b193363 | 823 | int sync_page_io(mdk_rdev_t *rdev, sector_t sector, int size, |
ccebd4c4 | 824 | struct page *page, int rw, bool metadata_op) |
1da177e4 | 825 | { |
a167f663 | 826 | struct bio *bio = bio_alloc_mddev(GFP_NOIO, 1, rdev->mddev); |
1da177e4 LT |
827 | struct completion event; |
828 | int ret; | |
829 | ||
721a9602 | 830 | rw |= REQ_SYNC; |
1da177e4 | 831 | |
a6ff7e08 JB |
832 | bio->bi_bdev = (metadata_op && rdev->meta_bdev) ? |
833 | rdev->meta_bdev : rdev->bdev; | |
ccebd4c4 JB |
834 | if (metadata_op) |
835 | bio->bi_sector = sector + rdev->sb_start; | |
836 | else | |
837 | bio->bi_sector = sector + rdev->data_offset; | |
1da177e4 LT |
838 | bio_add_page(bio, page, size, 0); |
839 | init_completion(&event); | |
840 | bio->bi_private = &event; | |
841 | bio->bi_end_io = bi_complete; | |
842 | submit_bio(rw, bio); | |
843 | wait_for_completion(&event); | |
844 | ||
845 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
846 | bio_put(bio); | |
847 | return ret; | |
848 | } | |
a8745db2 | 849 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 850 | |
0002b271 | 851 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
852 | { |
853 | char b[BDEVNAME_SIZE]; | |
854 | if (!rdev->sb_page) { | |
855 | MD_BUG(); | |
856 | return -EINVAL; | |
857 | } | |
858 | if (rdev->sb_loaded) | |
859 | return 0; | |
860 | ||
861 | ||
ccebd4c4 | 862 | if (!sync_page_io(rdev, 0, size, rdev->sb_page, READ, true)) |
1da177e4 LT |
863 | goto fail; |
864 | rdev->sb_loaded = 1; | |
865 | return 0; | |
866 | ||
867 | fail: | |
868 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
869 | bdevname(rdev->bdev,b)); | |
870 | return -EINVAL; | |
871 | } | |
872 | ||
873 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
874 | { | |
05710466 AN |
875 | return sb1->set_uuid0 == sb2->set_uuid0 && |
876 | sb1->set_uuid1 == sb2->set_uuid1 && | |
877 | sb1->set_uuid2 == sb2->set_uuid2 && | |
878 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
879 | } |
880 | ||
1da177e4 LT |
881 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
882 | { | |
883 | int ret; | |
884 | mdp_super_t *tmp1, *tmp2; | |
885 | ||
886 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
887 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
888 | ||
889 | if (!tmp1 || !tmp2) { | |
890 | ret = 0; | |
35020f1a | 891 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
892 | goto abort; |
893 | } | |
894 | ||
895 | *tmp1 = *sb1; | |
896 | *tmp2 = *sb2; | |
897 | ||
898 | /* | |
899 | * nr_disks is not constant | |
900 | */ | |
901 | tmp1->nr_disks = 0; | |
902 | tmp2->nr_disks = 0; | |
903 | ||
ce0c8e05 | 904 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 905 | abort: |
990a8baf JJ |
906 | kfree(tmp1); |
907 | kfree(tmp2); | |
1da177e4 LT |
908 | return ret; |
909 | } | |
910 | ||
4d167f09 N |
911 | |
912 | static u32 md_csum_fold(u32 csum) | |
913 | { | |
914 | csum = (csum & 0xffff) + (csum >> 16); | |
915 | return (csum & 0xffff) + (csum >> 16); | |
916 | } | |
917 | ||
1da177e4 LT |
918 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
919 | { | |
4d167f09 N |
920 | u64 newcsum = 0; |
921 | u32 *sb32 = (u32*)sb; | |
922 | int i; | |
1da177e4 LT |
923 | unsigned int disk_csum, csum; |
924 | ||
925 | disk_csum = sb->sb_csum; | |
926 | sb->sb_csum = 0; | |
4d167f09 N |
927 | |
928 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
929 | newcsum += sb32[i]; | |
930 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
931 | ||
932 | ||
933 | #ifdef CONFIG_ALPHA | |
934 | /* This used to use csum_partial, which was wrong for several | |
935 | * reasons including that different results are returned on | |
936 | * different architectures. It isn't critical that we get exactly | |
937 | * the same return value as before (we always csum_fold before | |
938 | * testing, and that removes any differences). However as we | |
939 | * know that csum_partial always returned a 16bit value on | |
940 | * alphas, do a fold to maximise conformity to previous behaviour. | |
941 | */ | |
942 | sb->sb_csum = md_csum_fold(disk_csum); | |
943 | #else | |
1da177e4 | 944 | sb->sb_csum = disk_csum; |
4d167f09 | 945 | #endif |
1da177e4 LT |
946 | return csum; |
947 | } | |
948 | ||
949 | ||
950 | /* | |
951 | * Handle superblock details. | |
952 | * We want to be able to handle multiple superblock formats | |
953 | * so we have a common interface to them all, and an array of | |
954 | * different handlers. | |
955 | * We rely on user-space to write the initial superblock, and support | |
956 | * reading and updating of superblocks. | |
957 | * Interface methods are: | |
958 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
959 | * loads and validates a superblock on dev. | |
960 | * if refdev != NULL, compare superblocks on both devices | |
961 | * Return: | |
962 | * 0 - dev has a superblock that is compatible with refdev | |
963 | * 1 - dev has a superblock that is compatible and newer than refdev | |
964 | * so dev should be used as the refdev in future | |
965 | * -EINVAL superblock incompatible or invalid | |
966 | * -othererror e.g. -EIO | |
967 | * | |
968 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
969 | * Verify that dev is acceptable into mddev. | |
970 | * The first time, mddev->raid_disks will be 0, and data from | |
971 | * dev should be merged in. Subsequent calls check that dev | |
972 | * is new enough. Return 0 or -EINVAL | |
973 | * | |
974 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
975 | * Update the superblock for rdev with data in mddev | |
976 | * This does not write to disc. | |
977 | * | |
978 | */ | |
979 | ||
980 | struct super_type { | |
0cd17fec CW |
981 | char *name; |
982 | struct module *owner; | |
983 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
984 | int minor_version); | |
985 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
986 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
987 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 988 | sector_t num_sectors); |
1da177e4 LT |
989 | }; |
990 | ||
0894cc30 AN |
991 | /* |
992 | * Check that the given mddev has no bitmap. | |
993 | * | |
994 | * This function is called from the run method of all personalities that do not | |
995 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
996 | * has a bitmap. Otherwise, it returns 0. | |
997 | * | |
998 | */ | |
999 | int md_check_no_bitmap(mddev_t *mddev) | |
1000 | { | |
c3d9714e | 1001 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
1002 | return 0; |
1003 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
1004 | mdname(mddev), mddev->pers->name); | |
1005 | return 1; | |
1006 | } | |
1007 | EXPORT_SYMBOL(md_check_no_bitmap); | |
1008 | ||
1da177e4 LT |
1009 | /* |
1010 | * load_super for 0.90.0 | |
1011 | */ | |
1012 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1013 | { | |
1014 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
1015 | mdp_super_t *sb; | |
1016 | int ret; | |
1da177e4 LT |
1017 | |
1018 | /* | |
0f420358 | 1019 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
1020 | * it's at the end of the disk. |
1021 | * | |
1022 | * It also happens to be a multiple of 4Kb. | |
1023 | */ | |
57b2caa3 | 1024 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 1025 | |
0002b271 | 1026 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
1027 | if (ret) return ret; |
1028 | ||
1029 | ret = -EINVAL; | |
1030 | ||
1031 | bdevname(rdev->bdev, b); | |
65a06f06 | 1032 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1033 | |
1034 | if (sb->md_magic != MD_SB_MAGIC) { | |
1035 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
1036 | b); | |
1037 | goto abort; | |
1038 | } | |
1039 | ||
1040 | if (sb->major_version != 0 || | |
f6705578 N |
1041 | sb->minor_version < 90 || |
1042 | sb->minor_version > 91) { | |
1da177e4 LT |
1043 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
1044 | sb->major_version, sb->minor_version, | |
1045 | b); | |
1046 | goto abort; | |
1047 | } | |
1048 | ||
1049 | if (sb->raid_disks <= 0) | |
1050 | goto abort; | |
1051 | ||
4d167f09 | 1052 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
1053 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
1054 | b); | |
1055 | goto abort; | |
1056 | } | |
1057 | ||
1058 | rdev->preferred_minor = sb->md_minor; | |
1059 | rdev->data_offset = 0; | |
0002b271 | 1060 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
1061 | |
1062 | if (sb->level == LEVEL_MULTIPATH) | |
1063 | rdev->desc_nr = -1; | |
1064 | else | |
1065 | rdev->desc_nr = sb->this_disk.number; | |
1066 | ||
9a7b2b0f | 1067 | if (!refdev) { |
1da177e4 | 1068 | ret = 1; |
9a7b2b0f | 1069 | } else { |
1da177e4 | 1070 | __u64 ev1, ev2; |
65a06f06 | 1071 | mdp_super_t *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1072 | if (!uuid_equal(refsb, sb)) { |
1073 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
1074 | b, bdevname(refdev->bdev,b2)); | |
1075 | goto abort; | |
1076 | } | |
1077 | if (!sb_equal(refsb, sb)) { | |
1078 | printk(KERN_WARNING "md: %s has same UUID" | |
1079 | " but different superblock to %s\n", | |
1080 | b, bdevname(refdev->bdev, b2)); | |
1081 | goto abort; | |
1082 | } | |
1083 | ev1 = md_event(sb); | |
1084 | ev2 = md_event(refsb); | |
1085 | if (ev1 > ev2) | |
1086 | ret = 1; | |
1087 | else | |
1088 | ret = 0; | |
1089 | } | |
8190e754 | 1090 | rdev->sectors = rdev->sb_start; |
1da177e4 | 1091 | |
dd8ac336 | 1092 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
1093 | /* "this cannot possibly happen" ... */ |
1094 | ret = -EINVAL; | |
1095 | ||
1da177e4 LT |
1096 | abort: |
1097 | return ret; | |
1098 | } | |
1099 | ||
1100 | /* | |
1101 | * validate_super for 0.90.0 | |
1102 | */ | |
1103 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1104 | { | |
1105 | mdp_disk_t *desc; | |
65a06f06 | 1106 | mdp_super_t *sb = page_address(rdev->sb_page); |
07d84d10 | 1107 | __u64 ev1 = md_event(sb); |
1da177e4 | 1108 | |
41158c7e | 1109 | rdev->raid_disk = -1; |
c5d79adb N |
1110 | clear_bit(Faulty, &rdev->flags); |
1111 | clear_bit(In_sync, &rdev->flags); | |
1112 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1113 | |
1da177e4 LT |
1114 | if (mddev->raid_disks == 0) { |
1115 | mddev->major_version = 0; | |
1116 | mddev->minor_version = sb->minor_version; | |
1117 | mddev->patch_version = sb->patch_version; | |
e691063a | 1118 | mddev->external = 0; |
9d8f0363 | 1119 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1120 | mddev->ctime = sb->ctime; |
1121 | mddev->utime = sb->utime; | |
1122 | mddev->level = sb->level; | |
d9d166c2 | 1123 | mddev->clevel[0] = 0; |
1da177e4 LT |
1124 | mddev->layout = sb->layout; |
1125 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 1126 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 1127 | mddev->events = ev1; |
c3d9714e N |
1128 | mddev->bitmap_info.offset = 0; |
1129 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1130 | |
f6705578 N |
1131 | if (mddev->minor_version >= 91) { |
1132 | mddev->reshape_position = sb->reshape_position; | |
1133 | mddev->delta_disks = sb->delta_disks; | |
1134 | mddev->new_level = sb->new_level; | |
1135 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1136 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1137 | } else { |
1138 | mddev->reshape_position = MaxSector; | |
1139 | mddev->delta_disks = 0; | |
1140 | mddev->new_level = mddev->level; | |
1141 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1142 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1143 | } |
1144 | ||
1da177e4 LT |
1145 | if (sb->state & (1<<MD_SB_CLEAN)) |
1146 | mddev->recovery_cp = MaxSector; | |
1147 | else { | |
1148 | if (sb->events_hi == sb->cp_events_hi && | |
1149 | sb->events_lo == sb->cp_events_lo) { | |
1150 | mddev->recovery_cp = sb->recovery_cp; | |
1151 | } else | |
1152 | mddev->recovery_cp = 0; | |
1153 | } | |
1154 | ||
1155 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1156 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1157 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1158 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1159 | ||
1160 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1161 | |
1162 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1163 | mddev->bitmap_info.file == NULL) |
1164 | mddev->bitmap_info.offset = | |
1165 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1166 | |
41158c7e | 1167 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1168 | /* Insist on good event counter while assembling, except |
1169 | * for spares (which don't need an event count) */ | |
1da177e4 | 1170 | ++ev1; |
be6800a7 N |
1171 | if (sb->disks[rdev->desc_nr].state & ( |
1172 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1173 | if (ev1 < mddev->events) | |
1174 | return -EINVAL; | |
41158c7e N |
1175 | } else if (mddev->bitmap) { |
1176 | /* if adding to array with a bitmap, then we can accept an | |
1177 | * older device ... but not too old. | |
1178 | */ | |
41158c7e N |
1179 | if (ev1 < mddev->bitmap->events_cleared) |
1180 | return 0; | |
07d84d10 N |
1181 | } else { |
1182 | if (ev1 < mddev->events) | |
1183 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1184 | return 0; | |
1185 | } | |
41158c7e | 1186 | |
1da177e4 | 1187 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1188 | desc = sb->disks + rdev->desc_nr; |
1189 | ||
1190 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1191 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1192 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1193 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1194 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1195 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1196 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1197 | /* active but not in sync implies recovery up to | |
1198 | * reshape position. We don't know exactly where | |
1199 | * that is, so set to zero for now */ | |
1200 | if (mddev->minor_version >= 91) { | |
1201 | rdev->recovery_offset = 0; | |
1202 | rdev->raid_disk = desc->raid_disk; | |
1203 | } | |
1da177e4 | 1204 | } |
8ddf9efe N |
1205 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1206 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1207 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1208 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1209 | return 0; |
1210 | } | |
1211 | ||
1212 | /* | |
1213 | * sync_super for 0.90.0 | |
1214 | */ | |
1215 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1216 | { | |
1217 | mdp_super_t *sb; | |
1da177e4 LT |
1218 | mdk_rdev_t *rdev2; |
1219 | int next_spare = mddev->raid_disks; | |
19133a42 | 1220 | |
1da177e4 LT |
1221 | |
1222 | /* make rdev->sb match mddev data.. | |
1223 | * | |
1224 | * 1/ zero out disks | |
1225 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1226 | * 3/ any empty disks < next_spare become removed | |
1227 | * | |
1228 | * disks[0] gets initialised to REMOVED because | |
1229 | * we cannot be sure from other fields if it has | |
1230 | * been initialised or not. | |
1231 | */ | |
1232 | int i; | |
1233 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1234 | ||
61181565 N |
1235 | rdev->sb_size = MD_SB_BYTES; |
1236 | ||
65a06f06 | 1237 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1238 | |
1239 | memset(sb, 0, sizeof(*sb)); | |
1240 | ||
1241 | sb->md_magic = MD_SB_MAGIC; | |
1242 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1243 | sb->patch_version = mddev->patch_version; |
1244 | sb->gvalid_words = 0; /* ignored */ | |
1245 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1246 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1247 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1248 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1249 | ||
1250 | sb->ctime = mddev->ctime; | |
1251 | sb->level = mddev->level; | |
58c0fed4 | 1252 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1253 | sb->raid_disks = mddev->raid_disks; |
1254 | sb->md_minor = mddev->md_minor; | |
e691063a | 1255 | sb->not_persistent = 0; |
1da177e4 LT |
1256 | sb->utime = mddev->utime; |
1257 | sb->state = 0; | |
1258 | sb->events_hi = (mddev->events>>32); | |
1259 | sb->events_lo = (u32)mddev->events; | |
1260 | ||
f6705578 N |
1261 | if (mddev->reshape_position == MaxSector) |
1262 | sb->minor_version = 90; | |
1263 | else { | |
1264 | sb->minor_version = 91; | |
1265 | sb->reshape_position = mddev->reshape_position; | |
1266 | sb->new_level = mddev->new_level; | |
1267 | sb->delta_disks = mddev->delta_disks; | |
1268 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1269 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1270 | } |
1271 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1272 | if (mddev->in_sync) |
1273 | { | |
1274 | sb->recovery_cp = mddev->recovery_cp; | |
1275 | sb->cp_events_hi = (mddev->events>>32); | |
1276 | sb->cp_events_lo = (u32)mddev->events; | |
1277 | if (mddev->recovery_cp == MaxSector) | |
1278 | sb->state = (1<< MD_SB_CLEAN); | |
1279 | } else | |
1280 | sb->recovery_cp = 0; | |
1281 | ||
1282 | sb->layout = mddev->layout; | |
9d8f0363 | 1283 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1284 | |
c3d9714e | 1285 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1286 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1287 | ||
1da177e4 | 1288 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1289 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1290 | mdp_disk_t *d; |
86e6ffdd | 1291 | int desc_nr; |
0261cd9f N |
1292 | int is_active = test_bit(In_sync, &rdev2->flags); |
1293 | ||
1294 | if (rdev2->raid_disk >= 0 && | |
1295 | sb->minor_version >= 91) | |
1296 | /* we have nowhere to store the recovery_offset, | |
1297 | * but if it is not below the reshape_position, | |
1298 | * we can piggy-back on that. | |
1299 | */ | |
1300 | is_active = 1; | |
1301 | if (rdev2->raid_disk < 0 || | |
1302 | test_bit(Faulty, &rdev2->flags)) | |
1303 | is_active = 0; | |
1304 | if (is_active) | |
86e6ffdd | 1305 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1306 | else |
86e6ffdd | 1307 | desc_nr = next_spare++; |
19133a42 | 1308 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1309 | d = &sb->disks[rdev2->desc_nr]; |
1310 | nr_disks++; | |
1311 | d->number = rdev2->desc_nr; | |
1312 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1313 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1314 | if (is_active) |
1da177e4 LT |
1315 | d->raid_disk = rdev2->raid_disk; |
1316 | else | |
1317 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1318 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1319 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1320 | else if (is_active) { |
1da177e4 | 1321 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1322 | if (test_bit(In_sync, &rdev2->flags)) |
1323 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1324 | active++; |
1325 | working++; | |
1326 | } else { | |
1327 | d->state = 0; | |
1328 | spare++; | |
1329 | working++; | |
1330 | } | |
8ddf9efe N |
1331 | if (test_bit(WriteMostly, &rdev2->flags)) |
1332 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1333 | } |
1da177e4 LT |
1334 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1335 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1336 | mdp_disk_t *d = &sb->disks[i]; | |
1337 | if (d->state == 0 && d->number == 0) { | |
1338 | d->number = i; | |
1339 | d->raid_disk = i; | |
1340 | d->state = (1<<MD_DISK_REMOVED); | |
1341 | d->state |= (1<<MD_DISK_FAULTY); | |
1342 | failed++; | |
1343 | } | |
1344 | } | |
1345 | sb->nr_disks = nr_disks; | |
1346 | sb->active_disks = active; | |
1347 | sb->working_disks = working; | |
1348 | sb->failed_disks = failed; | |
1349 | sb->spare_disks = spare; | |
1350 | ||
1351 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1352 | sb->sb_csum = calc_sb_csum(sb); | |
1353 | } | |
1354 | ||
0cd17fec CW |
1355 | /* |
1356 | * rdev_size_change for 0.90.0 | |
1357 | */ | |
1358 | static unsigned long long | |
15f4a5fd | 1359 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1360 | { |
58c0fed4 | 1361 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1362 | return 0; /* component must fit device */ |
c3d9714e | 1363 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1364 | return 0; /* can't move bitmap */ |
57b2caa3 | 1365 | rdev->sb_start = calc_dev_sboffset(rdev); |
15f4a5fd AN |
1366 | if (!num_sectors || num_sectors > rdev->sb_start) |
1367 | num_sectors = rdev->sb_start; | |
0f420358 | 1368 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1369 | rdev->sb_page); |
1370 | md_super_wait(rdev->mddev); | |
c26a44ed | 1371 | return num_sectors; |
0cd17fec CW |
1372 | } |
1373 | ||
1374 | ||
1da177e4 LT |
1375 | /* |
1376 | * version 1 superblock | |
1377 | */ | |
1378 | ||
1c05b4bc | 1379 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1380 | { |
1c05b4bc N |
1381 | __le32 disk_csum; |
1382 | u32 csum; | |
1da177e4 LT |
1383 | unsigned long long newcsum; |
1384 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1385 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1386 | int i; |
1387 | ||
1388 | disk_csum = sb->sb_csum; | |
1389 | sb->sb_csum = 0; | |
1390 | newcsum = 0; | |
1391 | for (i=0; size>=4; size -= 4 ) | |
1392 | newcsum += le32_to_cpu(*isuper++); | |
1393 | ||
1394 | if (size == 2) | |
1c05b4bc | 1395 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1396 | |
1397 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1398 | sb->sb_csum = disk_csum; | |
1399 | return cpu_to_le32(csum); | |
1400 | } | |
1401 | ||
2699b672 N |
1402 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, |
1403 | int acknowledged); | |
1da177e4 LT |
1404 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) |
1405 | { | |
1406 | struct mdp_superblock_1 *sb; | |
1407 | int ret; | |
0f420358 | 1408 | sector_t sb_start; |
1da177e4 | 1409 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1410 | int bmask; |
1da177e4 LT |
1411 | |
1412 | /* | |
0f420358 | 1413 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1414 | * It is always aligned to a 4K boundary and |
1415 | * depeding on minor_version, it can be: | |
1416 | * 0: At least 8K, but less than 12K, from end of device | |
1417 | * 1: At start of device | |
1418 | * 2: 4K from start of device. | |
1419 | */ | |
1420 | switch(minor_version) { | |
1421 | case 0: | |
77304d2a | 1422 | sb_start = i_size_read(rdev->bdev->bd_inode) >> 9; |
0f420358 AN |
1423 | sb_start -= 8*2; |
1424 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1425 | break; |
1426 | case 1: | |
0f420358 | 1427 | sb_start = 0; |
1da177e4 LT |
1428 | break; |
1429 | case 2: | |
0f420358 | 1430 | sb_start = 8; |
1da177e4 LT |
1431 | break; |
1432 | default: | |
1433 | return -EINVAL; | |
1434 | } | |
0f420358 | 1435 | rdev->sb_start = sb_start; |
1da177e4 | 1436 | |
0002b271 N |
1437 | /* superblock is rarely larger than 1K, but it can be larger, |
1438 | * and it is safe to read 4k, so we do that | |
1439 | */ | |
1440 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1441 | if (ret) return ret; |
1442 | ||
1443 | ||
65a06f06 | 1444 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1445 | |
1446 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1447 | sb->major_version != cpu_to_le32(1) || | |
1448 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1449 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1450 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1451 | return -EINVAL; |
1452 | ||
1453 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1454 | printk("md: invalid superblock checksum on %s\n", | |
1455 | bdevname(rdev->bdev,b)); | |
1456 | return -EINVAL; | |
1457 | } | |
1458 | if (le64_to_cpu(sb->data_size) < 10) { | |
1459 | printk("md: data_size too small on %s\n", | |
1460 | bdevname(rdev->bdev,b)); | |
1461 | return -EINVAL; | |
1462 | } | |
e11e93fa | 1463 | |
1da177e4 LT |
1464 | rdev->preferred_minor = 0xffff; |
1465 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1466 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1467 | |
0002b271 | 1468 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1469 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1470 | if (rdev->sb_size & bmask) |
a1801f85 N |
1471 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1472 | ||
1473 | if (minor_version | |
0f420358 | 1474 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1475 | return -EINVAL; |
0002b271 | 1476 | |
31b65a0d N |
1477 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1478 | rdev->desc_nr = -1; | |
1479 | else | |
1480 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1481 | ||
2699b672 N |
1482 | if (!rdev->bb_page) { |
1483 | rdev->bb_page = alloc_page(GFP_KERNEL); | |
1484 | if (!rdev->bb_page) | |
1485 | return -ENOMEM; | |
1486 | } | |
1487 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BAD_BLOCKS) && | |
1488 | rdev->badblocks.count == 0) { | |
1489 | /* need to load the bad block list. | |
1490 | * Currently we limit it to one page. | |
1491 | */ | |
1492 | s32 offset; | |
1493 | sector_t bb_sector; | |
1494 | u64 *bbp; | |
1495 | int i; | |
1496 | int sectors = le16_to_cpu(sb->bblog_size); | |
1497 | if (sectors > (PAGE_SIZE / 512)) | |
1498 | return -EINVAL; | |
1499 | offset = le32_to_cpu(sb->bblog_offset); | |
1500 | if (offset == 0) | |
1501 | return -EINVAL; | |
1502 | bb_sector = (long long)offset; | |
1503 | if (!sync_page_io(rdev, bb_sector, sectors << 9, | |
1504 | rdev->bb_page, READ, true)) | |
1505 | return -EIO; | |
1506 | bbp = (u64 *)page_address(rdev->bb_page); | |
1507 | rdev->badblocks.shift = sb->bblog_shift; | |
1508 | for (i = 0 ; i < (sectors << (9-3)) ; i++, bbp++) { | |
1509 | u64 bb = le64_to_cpu(*bbp); | |
1510 | int count = bb & (0x3ff); | |
1511 | u64 sector = bb >> 10; | |
1512 | sector <<= sb->bblog_shift; | |
1513 | count <<= sb->bblog_shift; | |
1514 | if (bb + 1 == 0) | |
1515 | break; | |
1516 | if (md_set_badblocks(&rdev->badblocks, | |
1517 | sector, count, 1) == 0) | |
1518 | return -EINVAL; | |
1519 | } | |
1520 | } else if (sb->bblog_offset == 0) | |
1521 | rdev->badblocks.shift = -1; | |
1522 | ||
9a7b2b0f | 1523 | if (!refdev) { |
8ed75463 | 1524 | ret = 1; |
9a7b2b0f | 1525 | } else { |
1da177e4 | 1526 | __u64 ev1, ev2; |
65a06f06 | 1527 | struct mdp_superblock_1 *refsb = page_address(refdev->sb_page); |
1da177e4 LT |
1528 | |
1529 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1530 | sb->level != refsb->level || | |
1531 | sb->layout != refsb->layout || | |
1532 | sb->chunksize != refsb->chunksize) { | |
1533 | printk(KERN_WARNING "md: %s has strangely different" | |
1534 | " superblock to %s\n", | |
1535 | bdevname(rdev->bdev,b), | |
1536 | bdevname(refdev->bdev,b2)); | |
1537 | return -EINVAL; | |
1538 | } | |
1539 | ev1 = le64_to_cpu(sb->events); | |
1540 | ev2 = le64_to_cpu(refsb->events); | |
1541 | ||
1542 | if (ev1 > ev2) | |
8ed75463 N |
1543 | ret = 1; |
1544 | else | |
1545 | ret = 0; | |
1da177e4 | 1546 | } |
a1801f85 | 1547 | if (minor_version) |
77304d2a | 1548 | rdev->sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 1549 | le64_to_cpu(sb->data_offset); |
1da177e4 | 1550 | else |
dd8ac336 AN |
1551 | rdev->sectors = rdev->sb_start; |
1552 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1553 | return -EINVAL; |
dd8ac336 | 1554 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1555 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1556 | return -EINVAL; |
8ed75463 | 1557 | return ret; |
1da177e4 LT |
1558 | } |
1559 | ||
1560 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1561 | { | |
65a06f06 | 1562 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); |
07d84d10 | 1563 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1564 | |
41158c7e | 1565 | rdev->raid_disk = -1; |
c5d79adb N |
1566 | clear_bit(Faulty, &rdev->flags); |
1567 | clear_bit(In_sync, &rdev->flags); | |
1568 | clear_bit(WriteMostly, &rdev->flags); | |
c5d79adb | 1569 | |
1da177e4 LT |
1570 | if (mddev->raid_disks == 0) { |
1571 | mddev->major_version = 1; | |
1572 | mddev->patch_version = 0; | |
e691063a | 1573 | mddev->external = 0; |
9d8f0363 | 1574 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1575 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1576 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1577 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1578 | mddev->clevel[0] = 0; |
1da177e4 LT |
1579 | mddev->layout = le32_to_cpu(sb->layout); |
1580 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1581 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1582 | mddev->events = ev1; |
c3d9714e N |
1583 | mddev->bitmap_info.offset = 0; |
1584 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1585 | |
1586 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1587 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1588 | ||
1589 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1590 | |
71c0805c | 1591 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1592 | mddev->bitmap_info.file == NULL ) |
1593 | mddev->bitmap_info.offset = | |
1594 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1595 | |
f6705578 N |
1596 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1597 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1598 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1599 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1600 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1601 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1602 | } else { |
1603 | mddev->reshape_position = MaxSector; | |
1604 | mddev->delta_disks = 0; | |
1605 | mddev->new_level = mddev->level; | |
1606 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1607 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1608 | } |
1609 | ||
41158c7e | 1610 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1611 | /* Insist of good event counter while assembling, except for |
1612 | * spares (which don't need an event count) */ | |
1da177e4 | 1613 | ++ev1; |
be6800a7 N |
1614 | if (rdev->desc_nr >= 0 && |
1615 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1616 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1617 | if (ev1 < mddev->events) | |
1618 | return -EINVAL; | |
41158c7e N |
1619 | } else if (mddev->bitmap) { |
1620 | /* If adding to array with a bitmap, then we can accept an | |
1621 | * older device, but not too old. | |
1622 | */ | |
41158c7e N |
1623 | if (ev1 < mddev->bitmap->events_cleared) |
1624 | return 0; | |
07d84d10 N |
1625 | } else { |
1626 | if (ev1 < mddev->events) | |
1627 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1628 | return 0; | |
1629 | } | |
1da177e4 LT |
1630 | if (mddev->level != LEVEL_MULTIPATH) { |
1631 | int role; | |
3673f305 N |
1632 | if (rdev->desc_nr < 0 || |
1633 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1634 | role = 0xffff; | |
1635 | rdev->desc_nr = -1; | |
1636 | } else | |
1637 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1638 | switch(role) { |
1639 | case 0xffff: /* spare */ | |
1da177e4 LT |
1640 | break; |
1641 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1642 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1643 | break; |
1644 | default: | |
5fd6c1dc N |
1645 | if ((le32_to_cpu(sb->feature_map) & |
1646 | MD_FEATURE_RECOVERY_OFFSET)) | |
1647 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1648 | else | |
1649 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1650 | rdev->raid_disk = role; |
1651 | break; | |
1652 | } | |
8ddf9efe N |
1653 | if (sb->devflags & WriteMostly1) |
1654 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1655 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1656 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1657 | |
1da177e4 LT |
1658 | return 0; |
1659 | } | |
1660 | ||
1661 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1662 | { | |
1663 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1664 | mdk_rdev_t *rdev2; |
1665 | int max_dev, i; | |
1666 | /* make rdev->sb match mddev and rdev data. */ | |
1667 | ||
65a06f06 | 1668 | sb = page_address(rdev->sb_page); |
1da177e4 LT |
1669 | |
1670 | sb->feature_map = 0; | |
1671 | sb->pad0 = 0; | |
5fd6c1dc | 1672 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 | 1673 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1da177e4 LT |
1674 | memset(sb->pad3, 0, sizeof(sb->pad3)); |
1675 | ||
1676 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1677 | sb->events = cpu_to_le64(mddev->events); | |
1678 | if (mddev->in_sync) | |
1679 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1680 | else | |
1681 | sb->resync_offset = cpu_to_le64(0); | |
1682 | ||
1c05b4bc | 1683 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1684 | |
f0ca340c | 1685 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1686 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1687 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1688 | sb->level = cpu_to_le32(mddev->level); |
1689 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1690 | |
c3d9714e N |
1691 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1692 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1693 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1694 | } |
5fd6c1dc N |
1695 | |
1696 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1697 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1698 | sb->feature_map |= |
1699 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1700 | sb->recovery_offset = | |
1701 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1702 | } |
1703 | ||
f6705578 N |
1704 | if (mddev->reshape_position != MaxSector) { |
1705 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1706 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1707 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1708 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1709 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1710 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1711 | } |
a654b9d8 | 1712 | |
2699b672 N |
1713 | if (rdev->badblocks.count == 0) |
1714 | /* Nothing to do for bad blocks*/ ; | |
1715 | else if (sb->bblog_offset == 0) | |
1716 | /* Cannot record bad blocks on this device */ | |
1717 | md_error(mddev, rdev); | |
1718 | else { | |
1719 | struct badblocks *bb = &rdev->badblocks; | |
1720 | u64 *bbp = (u64 *)page_address(rdev->bb_page); | |
1721 | u64 *p = bb->page; | |
1722 | sb->feature_map |= cpu_to_le32(MD_FEATURE_BAD_BLOCKS); | |
1723 | if (bb->changed) { | |
1724 | unsigned seq; | |
1725 | ||
1726 | retry: | |
1727 | seq = read_seqbegin(&bb->lock); | |
1728 | ||
1729 | memset(bbp, 0xff, PAGE_SIZE); | |
1730 | ||
1731 | for (i = 0 ; i < bb->count ; i++) { | |
1732 | u64 internal_bb = *p++; | |
1733 | u64 store_bb = ((BB_OFFSET(internal_bb) << 10) | |
1734 | | BB_LEN(internal_bb)); | |
1735 | *bbp++ = cpu_to_le64(store_bb); | |
1736 | } | |
1737 | if (read_seqretry(&bb->lock, seq)) | |
1738 | goto retry; | |
1739 | ||
1740 | bb->sector = (rdev->sb_start + | |
1741 | (int)le32_to_cpu(sb->bblog_offset)); | |
1742 | bb->size = le16_to_cpu(sb->bblog_size); | |
1743 | bb->changed = 0; | |
1744 | } | |
1745 | } | |
1746 | ||
1da177e4 | 1747 | max_dev = 0; |
159ec1fc | 1748 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1749 | if (rdev2->desc_nr+1 > max_dev) |
1750 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1751 | |
70471daf N |
1752 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1753 | int bmask; | |
a778b73f | 1754 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1755 | rdev->sb_size = max_dev * 2 + 256; |
1756 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1757 | if (rdev->sb_size & bmask) | |
1758 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
ddcf3522 N |
1759 | } else |
1760 | max_dev = le32_to_cpu(sb->max_dev); | |
1761 | ||
1da177e4 LT |
1762 | for (i=0; i<max_dev;i++) |
1763 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1764 | ||
159ec1fc | 1765 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1766 | i = rdev2->desc_nr; |
b2d444d7 | 1767 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1768 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1769 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1770 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1771 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1772 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1773 | else |
1774 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1775 | } | |
1776 | ||
1da177e4 LT |
1777 | sb->sb_csum = calc_sb_1_csum(sb); |
1778 | } | |
1779 | ||
0cd17fec | 1780 | static unsigned long long |
15f4a5fd | 1781 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1782 | { |
1783 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1784 | sector_t max_sectors; |
58c0fed4 | 1785 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1786 | return 0; /* component must fit device */ |
0f420358 | 1787 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1788 | /* minor versions 1 and 2; superblock before data */ |
77304d2a | 1789 | max_sectors = i_size_read(rdev->bdev->bd_inode) >> 9; |
15f4a5fd AN |
1790 | max_sectors -= rdev->data_offset; |
1791 | if (!num_sectors || num_sectors > max_sectors) | |
1792 | num_sectors = max_sectors; | |
c3d9714e | 1793 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1794 | /* minor version 0 with bitmap we can't move */ |
1795 | return 0; | |
1796 | } else { | |
1797 | /* minor version 0; superblock after data */ | |
0f420358 | 1798 | sector_t sb_start; |
77304d2a | 1799 | sb_start = (i_size_read(rdev->bdev->bd_inode) >> 9) - 8*2; |
0f420358 | 1800 | sb_start &= ~(sector_t)(4*2 - 1); |
dd8ac336 | 1801 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1802 | if (!num_sectors || num_sectors > max_sectors) |
1803 | num_sectors = max_sectors; | |
0f420358 | 1804 | rdev->sb_start = sb_start; |
0cd17fec | 1805 | } |
65a06f06 | 1806 | sb = page_address(rdev->sb_page); |
15f4a5fd | 1807 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1808 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1809 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1810 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1811 | rdev->sb_page); |
1812 | md_super_wait(rdev->mddev); | |
c26a44ed | 1813 | return num_sectors; |
0cd17fec | 1814 | } |
1da177e4 | 1815 | |
75c96f85 | 1816 | static struct super_type super_types[] = { |
1da177e4 LT |
1817 | [0] = { |
1818 | .name = "0.90.0", | |
1819 | .owner = THIS_MODULE, | |
0cd17fec CW |
1820 | .load_super = super_90_load, |
1821 | .validate_super = super_90_validate, | |
1822 | .sync_super = super_90_sync, | |
1823 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1824 | }, |
1825 | [1] = { | |
1826 | .name = "md-1", | |
1827 | .owner = THIS_MODULE, | |
0cd17fec CW |
1828 | .load_super = super_1_load, |
1829 | .validate_super = super_1_validate, | |
1830 | .sync_super = super_1_sync, | |
1831 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1832 | }, |
1833 | }; | |
1da177e4 | 1834 | |
076f968b JB |
1835 | static void sync_super(mddev_t *mddev, mdk_rdev_t *rdev) |
1836 | { | |
1837 | if (mddev->sync_super) { | |
1838 | mddev->sync_super(mddev, rdev); | |
1839 | return; | |
1840 | } | |
1841 | ||
1842 | BUG_ON(mddev->major_version >= ARRAY_SIZE(super_types)); | |
1843 | ||
1844 | super_types[mddev->major_version].sync_super(mddev, rdev); | |
1845 | } | |
1846 | ||
1da177e4 LT |
1847 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) |
1848 | { | |
7dd5e7c3 | 1849 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1850 | |
4b80991c N |
1851 | rcu_read_lock(); |
1852 | rdev_for_each_rcu(rdev, mddev1) | |
1853 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1854 | if (rdev->bdev->bd_contains == |
4b80991c N |
1855 | rdev2->bdev->bd_contains) { |
1856 | rcu_read_unlock(); | |
7dd5e7c3 | 1857 | return 1; |
4b80991c N |
1858 | } |
1859 | rcu_read_unlock(); | |
1da177e4 LT |
1860 | return 0; |
1861 | } | |
1862 | ||
1863 | static LIST_HEAD(pending_raid_disks); | |
1864 | ||
ac5e7113 AN |
1865 | /* |
1866 | * Try to register data integrity profile for an mddev | |
1867 | * | |
1868 | * This is called when an array is started and after a disk has been kicked | |
1869 | * from the array. It only succeeds if all working and active component devices | |
1870 | * are integrity capable with matching profiles. | |
1871 | */ | |
1872 | int md_integrity_register(mddev_t *mddev) | |
1873 | { | |
1874 | mdk_rdev_t *rdev, *reference = NULL; | |
1875 | ||
1876 | if (list_empty(&mddev->disks)) | |
1877 | return 0; /* nothing to do */ | |
629acb6a JB |
1878 | if (!mddev->gendisk || blk_get_integrity(mddev->gendisk)) |
1879 | return 0; /* shouldn't register, or already is */ | |
ac5e7113 AN |
1880 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1881 | /* skip spares and non-functional disks */ | |
1882 | if (test_bit(Faulty, &rdev->flags)) | |
1883 | continue; | |
1884 | if (rdev->raid_disk < 0) | |
1885 | continue; | |
ac5e7113 AN |
1886 | if (!reference) { |
1887 | /* Use the first rdev as the reference */ | |
1888 | reference = rdev; | |
1889 | continue; | |
1890 | } | |
1891 | /* does this rdev's profile match the reference profile? */ | |
1892 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1893 | rdev->bdev->bd_disk) < 0) | |
1894 | return -EINVAL; | |
1895 | } | |
89078d57 MP |
1896 | if (!reference || !bdev_get_integrity(reference->bdev)) |
1897 | return 0; | |
ac5e7113 AN |
1898 | /* |
1899 | * All component devices are integrity capable and have matching | |
1900 | * profiles, register the common profile for the md device. | |
1901 | */ | |
1902 | if (blk_integrity_register(mddev->gendisk, | |
1903 | bdev_get_integrity(reference->bdev)) != 0) { | |
1904 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1905 | mdname(mddev)); | |
1906 | return -EINVAL; | |
1907 | } | |
a91a2785 MP |
1908 | printk(KERN_NOTICE "md: data integrity enabled on %s\n", mdname(mddev)); |
1909 | if (bioset_integrity_create(mddev->bio_set, BIO_POOL_SIZE)) { | |
1910 | printk(KERN_ERR "md: failed to create integrity pool for %s\n", | |
1911 | mdname(mddev)); | |
1912 | return -EINVAL; | |
1913 | } | |
ac5e7113 AN |
1914 | return 0; |
1915 | } | |
1916 | EXPORT_SYMBOL(md_integrity_register); | |
1917 | ||
1918 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1919 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1920 | { |
3f9d99c1 | 1921 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1922 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1923 | |
ac5e7113 | 1924 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1925 | return; |
ac5e7113 | 1926 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1927 | return; |
ac5e7113 AN |
1928 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1929 | rdev->bdev->bd_disk) >= 0) | |
1930 | return; | |
1931 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1932 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1933 | } |
ac5e7113 | 1934 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1935 | |
1da177e4 LT |
1936 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1937 | { | |
7dd5e7c3 | 1938 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1939 | struct kobject *ko; |
1edf80d3 | 1940 | char *s; |
5e55e2f5 | 1941 | int err; |
1da177e4 LT |
1942 | |
1943 | if (rdev->mddev) { | |
1944 | MD_BUG(); | |
1945 | return -EINVAL; | |
1946 | } | |
11e2ede0 DW |
1947 | |
1948 | /* prevent duplicates */ | |
1949 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1950 | return -EEXIST; | |
1951 | ||
dd8ac336 AN |
1952 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1953 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1954 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1955 | if (mddev->pers) { |
1956 | /* Cannot change size, so fail | |
1957 | * If mddev->level <= 0, then we don't care | |
1958 | * about aligning sizes (e.g. linear) | |
1959 | */ | |
1960 | if (mddev->level > 0) | |
1961 | return -ENOSPC; | |
1962 | } else | |
dd8ac336 | 1963 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1964 | } |
1da177e4 LT |
1965 | |
1966 | /* Verify rdev->desc_nr is unique. | |
1967 | * If it is -1, assign a free number, else | |
1968 | * check number is not in use | |
1969 | */ | |
1970 | if (rdev->desc_nr < 0) { | |
1971 | int choice = 0; | |
1972 | if (mddev->pers) choice = mddev->raid_disks; | |
1973 | while (find_rdev_nr(mddev, choice)) | |
1974 | choice++; | |
1975 | rdev->desc_nr = choice; | |
1976 | } else { | |
1977 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1978 | return -EBUSY; | |
1979 | } | |
de01dfad N |
1980 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1981 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1982 | mdname(mddev), mddev->max_disks); | |
1983 | return -EBUSY; | |
1984 | } | |
19133a42 | 1985 | bdevname(rdev->bdev,b); |
649316b2 | 1986 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1987 | *s = '!'; |
649316b2 | 1988 | |
1da177e4 | 1989 | rdev->mddev = mddev; |
19133a42 | 1990 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1991 | |
b2d6db58 | 1992 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1993 | goto fail; |
86e6ffdd | 1994 | |
0762b8bd | 1995 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
00bcb4ac N |
1996 | if (sysfs_create_link(&rdev->kobj, ko, "block")) |
1997 | /* failure here is OK */; | |
1998 | rdev->sysfs_state = sysfs_get_dirent_safe(rdev->kobj.sd, "state"); | |
3c0ee63a | 1999 | |
4b80991c | 2000 | list_add_rcu(&rdev->same_set, &mddev->disks); |
e09b457b | 2001 | bd_link_disk_holder(rdev->bdev, mddev->gendisk); |
4044ba58 N |
2002 | |
2003 | /* May as well allow recovery to be retried once */ | |
5389042f | 2004 | mddev->recovery_disabled++; |
3f9d99c1 | 2005 | |
1da177e4 | 2006 | return 0; |
5e55e2f5 N |
2007 | |
2008 | fail: | |
2009 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
2010 | b, mdname(mddev)); | |
2011 | return err; | |
1da177e4 LT |
2012 | } |
2013 | ||
177a99b2 | 2014 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
2015 | { |
2016 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
2017 | kobject_del(&rdev->kobj); | |
177a99b2 | 2018 | kobject_put(&rdev->kobj); |
5792a285 N |
2019 | } |
2020 | ||
1da177e4 LT |
2021 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
2022 | { | |
2023 | char b[BDEVNAME_SIZE]; | |
2024 | if (!rdev->mddev) { | |
2025 | MD_BUG(); | |
2026 | return; | |
2027 | } | |
49731baa | 2028 | bd_unlink_disk_holder(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 2029 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
2030 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
2031 | rdev->mddev = NULL; | |
86e6ffdd | 2032 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
2033 | sysfs_put(rdev->sysfs_state); |
2034 | rdev->sysfs_state = NULL; | |
2230dfe4 N |
2035 | kfree(rdev->badblocks.page); |
2036 | rdev->badblocks.count = 0; | |
2037 | rdev->badblocks.page = NULL; | |
5792a285 | 2038 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
2039 | * writing to 'remove' to "dev/state". We also need |
2040 | * to delay it due to rcu usage. | |
5792a285 | 2041 | */ |
4b80991c | 2042 | synchronize_rcu(); |
177a99b2 N |
2043 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
2044 | kobject_get(&rdev->kobj); | |
e804ac78 | 2045 | queue_work(md_misc_wq, &rdev->del_work); |
1da177e4 LT |
2046 | } |
2047 | ||
2048 | /* | |
2049 | * prevent the device from being mounted, repartitioned or | |
2050 | * otherwise reused by a RAID array (or any other kernel | |
2051 | * subsystem), by bd_claiming the device. | |
2052 | */ | |
c5d79adb | 2053 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
2054 | { |
2055 | int err = 0; | |
2056 | struct block_device *bdev; | |
2057 | char b[BDEVNAME_SIZE]; | |
2058 | ||
d4d77629 TH |
2059 | bdev = blkdev_get_by_dev(dev, FMODE_READ|FMODE_WRITE|FMODE_EXCL, |
2060 | shared ? (mdk_rdev_t *)lock_rdev : rdev); | |
1da177e4 LT |
2061 | if (IS_ERR(bdev)) { |
2062 | printk(KERN_ERR "md: could not open %s.\n", | |
2063 | __bdevname(dev, b)); | |
2064 | return PTR_ERR(bdev); | |
2065 | } | |
1da177e4 LT |
2066 | rdev->bdev = bdev; |
2067 | return err; | |
2068 | } | |
2069 | ||
2070 | static void unlock_rdev(mdk_rdev_t *rdev) | |
2071 | { | |
2072 | struct block_device *bdev = rdev->bdev; | |
2073 | rdev->bdev = NULL; | |
2074 | if (!bdev) | |
2075 | MD_BUG(); | |
e525fd89 | 2076 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE|FMODE_EXCL); |
1da177e4 LT |
2077 | } |
2078 | ||
2079 | void md_autodetect_dev(dev_t dev); | |
2080 | ||
2081 | static void export_rdev(mdk_rdev_t * rdev) | |
2082 | { | |
2083 | char b[BDEVNAME_SIZE]; | |
2084 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
2085 | bdevname(rdev->bdev,b)); | |
2086 | if (rdev->mddev) | |
2087 | MD_BUG(); | |
2088 | free_disk_sb(rdev); | |
1da177e4 | 2089 | #ifndef MODULE |
d0fae18f N |
2090 | if (test_bit(AutoDetected, &rdev->flags)) |
2091 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
2092 | #endif |
2093 | unlock_rdev(rdev); | |
86e6ffdd | 2094 | kobject_put(&rdev->kobj); |
1da177e4 LT |
2095 | } |
2096 | ||
2097 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
2098 | { | |
2099 | unbind_rdev_from_array(rdev); | |
2100 | export_rdev(rdev); | |
2101 | } | |
2102 | ||
2103 | static void export_array(mddev_t *mddev) | |
2104 | { | |
159ec1fc | 2105 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 2106 | |
d089c6af | 2107 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
2108 | if (!rdev->mddev) { |
2109 | MD_BUG(); | |
2110 | continue; | |
2111 | } | |
2112 | kick_rdev_from_array(rdev); | |
2113 | } | |
2114 | if (!list_empty(&mddev->disks)) | |
2115 | MD_BUG(); | |
2116 | mddev->raid_disks = 0; | |
2117 | mddev->major_version = 0; | |
2118 | } | |
2119 | ||
2120 | static void print_desc(mdp_disk_t *desc) | |
2121 | { | |
2122 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
2123 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
2124 | } | |
2125 | ||
cd2ac932 | 2126 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
2127 | { |
2128 | int i; | |
2129 | ||
2130 | printk(KERN_INFO | |
2131 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
2132 | sb->major_version, sb->minor_version, sb->patch_version, | |
2133 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
2134 | sb->ctime); | |
2135 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
2136 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
2137 | sb->md_minor, sb->layout, sb->chunk_size); | |
2138 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
2139 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
2140 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
2141 | sb->failed_disks, sb->spare_disks, | |
2142 | sb->sb_csum, (unsigned long)sb->events_lo); | |
2143 | ||
2144 | printk(KERN_INFO); | |
2145 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2146 | mdp_disk_t *desc; | |
2147 | ||
2148 | desc = sb->disks + i; | |
2149 | if (desc->number || desc->major || desc->minor || | |
2150 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
2151 | printk(" D %2d: ", i); | |
2152 | print_desc(desc); | |
2153 | } | |
2154 | } | |
2155 | printk(KERN_INFO "md: THIS: "); | |
2156 | print_desc(&sb->this_disk); | |
cd2ac932 | 2157 | } |
1da177e4 | 2158 | |
cd2ac932 CR |
2159 | static void print_sb_1(struct mdp_superblock_1 *sb) |
2160 | { | |
2161 | __u8 *uuid; | |
2162 | ||
2163 | uuid = sb->set_uuid; | |
ad361c98 | 2164 | printk(KERN_INFO |
7b75c2f8 | 2165 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 2166 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
2167 | le32_to_cpu(sb->major_version), |
2168 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 2169 | uuid, |
cd2ac932 CR |
2170 | sb->set_name, |
2171 | (unsigned long long)le64_to_cpu(sb->ctime) | |
2172 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
2173 | ||
2174 | uuid = sb->device_uuid; | |
ad361c98 JP |
2175 | printk(KERN_INFO |
2176 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2177 | " RO:%llu\n" |
7b75c2f8 | 2178 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2179 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2180 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2181 | le32_to_cpu(sb->level), |
2182 | (unsigned long long)le64_to_cpu(sb->size), | |
2183 | le32_to_cpu(sb->raid_disks), | |
2184 | le32_to_cpu(sb->layout), | |
2185 | le32_to_cpu(sb->chunksize), | |
2186 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2187 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2188 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2189 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2190 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2191 | uuid, |
cd2ac932 CR |
2192 | sb->devflags, |
2193 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2194 | (unsigned long long)le64_to_cpu(sb->events), | |
2195 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2196 | le32_to_cpu(sb->sb_csum), | |
2197 | le32_to_cpu(sb->max_dev) | |
2198 | ); | |
1da177e4 LT |
2199 | } |
2200 | ||
cd2ac932 | 2201 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
2202 | { |
2203 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2204 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2205 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2206 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2207 | rdev->desc_nr); | |
1da177e4 | 2208 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2209 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2210 | switch (major_version) { | |
2211 | case 0: | |
65a06f06 | 2212 | print_sb_90(page_address(rdev->sb_page)); |
cd2ac932 CR |
2213 | break; |
2214 | case 1: | |
65a06f06 | 2215 | print_sb_1(page_address(rdev->sb_page)); |
cd2ac932 CR |
2216 | break; |
2217 | } | |
1da177e4 LT |
2218 | } else |
2219 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2220 | } | |
2221 | ||
5e56341d | 2222 | static void md_print_devices(void) |
1da177e4 | 2223 | { |
159ec1fc | 2224 | struct list_head *tmp; |
1da177e4 LT |
2225 | mdk_rdev_t *rdev; |
2226 | mddev_t *mddev; | |
2227 | char b[BDEVNAME_SIZE]; | |
2228 | ||
2229 | printk("\n"); | |
2230 | printk("md: **********************************\n"); | |
2231 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2232 | printk("md: **********************************\n"); | |
29ac4aa3 | 2233 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2234 | |
32a7627c N |
2235 | if (mddev->bitmap) |
2236 | bitmap_print_sb(mddev->bitmap); | |
2237 | else | |
2238 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2239 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2240 | printk("<%s>", bdevname(rdev->bdev,b)); |
2241 | printk("\n"); | |
2242 | ||
159ec1fc | 2243 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2244 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2245 | } |
2246 | printk("md: **********************************\n"); | |
2247 | printk("\n"); | |
2248 | } | |
2249 | ||
2250 | ||
42543769 | 2251 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2252 | { |
42543769 N |
2253 | /* Update each superblock (in-memory image), but |
2254 | * if we are allowed to, skip spares which already | |
2255 | * have the right event counter, or have one earlier | |
2256 | * (which would mean they aren't being marked as dirty | |
2257 | * with the rest of the array) | |
2258 | */ | |
1da177e4 | 2259 | mdk_rdev_t *rdev; |
159ec1fc | 2260 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2261 | if (rdev->sb_events == mddev->events || |
2262 | (nospares && | |
2263 | rdev->raid_disk < 0 && | |
42543769 N |
2264 | rdev->sb_events+1 == mddev->events)) { |
2265 | /* Don't update this superblock */ | |
2266 | rdev->sb_loaded = 2; | |
2267 | } else { | |
076f968b | 2268 | sync_super(mddev, rdev); |
42543769 N |
2269 | rdev->sb_loaded = 1; |
2270 | } | |
1da177e4 LT |
2271 | } |
2272 | } | |
2273 | ||
850b2b42 | 2274 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2275 | { |
1da177e4 | 2276 | mdk_rdev_t *rdev; |
06d91a5f | 2277 | int sync_req; |
42543769 | 2278 | int nospares = 0; |
2699b672 | 2279 | int any_badblocks_changed = 0; |
1da177e4 | 2280 | |
1da177e4 | 2281 | repeat: |
3a3a5ddb N |
2282 | /* First make sure individual recovery_offsets are correct */ |
2283 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2284 | if (rdev->raid_disk >= 0 && | |
2285 | mddev->delta_disks >= 0 && | |
2286 | !test_bit(In_sync, &rdev->flags) && | |
2287 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2288 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2289 | ||
2290 | } | |
bd52b746 | 2291 | if (!mddev->persistent) { |
070dc6dd | 2292 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3a3a5ddb | 2293 | clear_bit(MD_CHANGE_DEVS, &mddev->flags); |
d97a41dc N |
2294 | if (!mddev->external) |
2295 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
3a3a5ddb N |
2296 | wake_up(&mddev->sb_wait); |
2297 | return; | |
2298 | } | |
2299 | ||
a9701a30 | 2300 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2301 | |
3a3a5ddb N |
2302 | mddev->utime = get_seconds(); |
2303 | ||
850b2b42 N |
2304 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) |
2305 | force_change = 1; | |
2306 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2307 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2308 | * though if events isn't the right even/odd, we will have to do | |
2309 | * spares after all | |
2310 | */ | |
2311 | nospares = 1; | |
2312 | if (force_change) | |
2313 | nospares = 0; | |
2314 | if (mddev->degraded) | |
84692195 N |
2315 | /* If the array is degraded, then skipping spares is both |
2316 | * dangerous and fairly pointless. | |
2317 | * Dangerous because a device that was removed from the array | |
2318 | * might have a event_count that still looks up-to-date, | |
2319 | * so it can be re-added without a resync. | |
2320 | * Pointless because if there are any spares to skip, | |
2321 | * then a recovery will happen and soon that array won't | |
2322 | * be degraded any more and the spare can go back to sleep then. | |
2323 | */ | |
850b2b42 | 2324 | nospares = 0; |
84692195 | 2325 | |
06d91a5f | 2326 | sync_req = mddev->in_sync; |
42543769 N |
2327 | |
2328 | /* If this is just a dirty<->clean transition, and the array is clean | |
2329 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2330 | if (nospares |
42543769 | 2331 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2332 | && mddev->can_decrease_events |
2333 | && mddev->events != 1) { | |
42543769 | 2334 | mddev->events--; |
a8707c08 N |
2335 | mddev->can_decrease_events = 0; |
2336 | } else { | |
42543769 N |
2337 | /* otherwise we have to go forward and ... */ |
2338 | mddev->events ++; | |
a8707c08 | 2339 | mddev->can_decrease_events = nospares; |
42543769 | 2340 | } |
1da177e4 LT |
2341 | |
2342 | if (!mddev->events) { | |
2343 | /* | |
2344 | * oops, this 64-bit counter should never wrap. | |
2345 | * Either we are in around ~1 trillion A.C., assuming | |
2346 | * 1 reboot per second, or we have a bug: | |
2347 | */ | |
2348 | MD_BUG(); | |
2349 | mddev->events --; | |
2350 | } | |
2699b672 N |
2351 | |
2352 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
2353 | if (rdev->badblocks.changed) | |
2354 | any_badblocks_changed++; | |
2355 | ||
e691063a | 2356 | sync_sbs(mddev, nospares); |
a9701a30 | 2357 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2358 | |
2359 | dprintk(KERN_INFO | |
2360 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2361 | mdname(mddev),mddev->in_sync); | |
2362 | ||
4ad13663 | 2363 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2364 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2365 | char b[BDEVNAME_SIZE]; |
2366 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2367 | if (rdev->sb_loaded != 1) |
2368 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2369 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2370 | dprintk("(skipping faulty "); |
2371 | ||
2372 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2373 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2374 | md_super_write(mddev,rdev, |
0f420358 | 2375 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2376 | rdev->sb_page); |
2377 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2378 | bdevname(rdev->bdev,b), | |
0f420358 | 2379 | (unsigned long long)rdev->sb_start); |
42543769 | 2380 | rdev->sb_events = mddev->events; |
2699b672 N |
2381 | if (rdev->badblocks.size) { |
2382 | md_super_write(mddev, rdev, | |
2383 | rdev->badblocks.sector, | |
2384 | rdev->badblocks.size << 9, | |
2385 | rdev->bb_page); | |
2386 | rdev->badblocks.size = 0; | |
2387 | } | |
7bfa19f2 | 2388 | |
1da177e4 LT |
2389 | } else |
2390 | dprintk(")\n"); | |
7bfa19f2 | 2391 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2392 | /* only need to write one superblock... */ |
2393 | break; | |
2394 | } | |
a9701a30 | 2395 | md_super_wait(mddev); |
850b2b42 | 2396 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2397 | |
a9701a30 | 2398 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2399 | if (mddev->in_sync != sync_req || |
2400 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2401 | /* have to write it out again */ |
a9701a30 | 2402 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2403 | goto repeat; |
2404 | } | |
850b2b42 | 2405 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2406 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2407 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2408 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2409 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2410 | |
2699b672 N |
2411 | if (any_badblocks_changed) |
2412 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
2413 | md_ack_all_badblocks(&rdev->badblocks); | |
1da177e4 LT |
2414 | } |
2415 | ||
7f6ce769 | 2416 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2417 | * We want to accept with case. For this we use cmd_match. |
2418 | */ | |
2419 | static int cmd_match(const char *cmd, const char *str) | |
2420 | { | |
2421 | /* See if cmd, written into a sysfs file, matches | |
2422 | * str. They must either be the same, or cmd can | |
2423 | * have a trailing newline | |
2424 | */ | |
2425 | while (*cmd && *str && *cmd == *str) { | |
2426 | cmd++; | |
2427 | str++; | |
2428 | } | |
2429 | if (*cmd == '\n') | |
2430 | cmd++; | |
2431 | if (*str || *cmd) | |
2432 | return 0; | |
2433 | return 1; | |
2434 | } | |
2435 | ||
86e6ffdd N |
2436 | struct rdev_sysfs_entry { |
2437 | struct attribute attr; | |
2438 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2439 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2440 | }; | |
2441 | ||
2442 | static ssize_t | |
96de1e66 | 2443 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2444 | { |
2445 | char *sep = ""; | |
20a49ff6 | 2446 | size_t len = 0; |
86e6ffdd | 2447 | |
b2d444d7 | 2448 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2449 | len+= sprintf(page+len, "%sfaulty",sep); |
2450 | sep = ","; | |
2451 | } | |
b2d444d7 | 2452 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2453 | len += sprintf(page+len, "%sin_sync",sep); |
2454 | sep = ","; | |
2455 | } | |
f655675b N |
2456 | if (test_bit(WriteMostly, &rdev->flags)) { |
2457 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2458 | sep = ","; | |
2459 | } | |
6bfe0b49 DW |
2460 | if (test_bit(Blocked, &rdev->flags)) { |
2461 | len += sprintf(page+len, "%sblocked", sep); | |
2462 | sep = ","; | |
2463 | } | |
b2d444d7 N |
2464 | if (!test_bit(Faulty, &rdev->flags) && |
2465 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2466 | len += sprintf(page+len, "%sspare", sep); |
2467 | sep = ","; | |
2468 | } | |
2469 | return len+sprintf(page+len, "\n"); | |
2470 | } | |
2471 | ||
45dc2de1 N |
2472 | static ssize_t |
2473 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2474 | { | |
2475 | /* can write | |
2476 | * faulty - simulates and error | |
2477 | * remove - disconnects the device | |
f655675b N |
2478 | * writemostly - sets write_mostly |
2479 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2480 | * blocked - sets the Blocked flag |
2481 | * -blocked - clears the Blocked flag | |
6d56e278 | 2482 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2483 | */ |
2484 | int err = -EINVAL; | |
2485 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2486 | md_error(rdev->mddev, rdev); | |
2487 | err = 0; | |
2488 | } else if (cmd_match(buf, "remove")) { | |
2489 | if (rdev->raid_disk >= 0) | |
2490 | err = -EBUSY; | |
2491 | else { | |
2492 | mddev_t *mddev = rdev->mddev; | |
2493 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2494 | if (mddev->pers) |
2495 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2496 | md_new_event(mddev); |
2497 | err = 0; | |
2498 | } | |
f655675b N |
2499 | } else if (cmd_match(buf, "writemostly")) { |
2500 | set_bit(WriteMostly, &rdev->flags); | |
2501 | err = 0; | |
2502 | } else if (cmd_match(buf, "-writemostly")) { | |
2503 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2504 | err = 0; |
2505 | } else if (cmd_match(buf, "blocked")) { | |
2506 | set_bit(Blocked, &rdev->flags); | |
2507 | err = 0; | |
2508 | } else if (cmd_match(buf, "-blocked")) { | |
2509 | clear_bit(Blocked, &rdev->flags); | |
2510 | wake_up(&rdev->blocked_wait); | |
2511 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2512 | md_wakeup_thread(rdev->mddev->thread); | |
2513 | ||
6d56e278 N |
2514 | err = 0; |
2515 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2516 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2517 | err = 0; |
45dc2de1 | 2518 | } |
00bcb4ac N |
2519 | if (!err) |
2520 | sysfs_notify_dirent_safe(rdev->sysfs_state); | |
45dc2de1 N |
2521 | return err ? err : len; |
2522 | } | |
80ca3a44 N |
2523 | static struct rdev_sysfs_entry rdev_state = |
2524 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2525 | |
4dbcdc75 N |
2526 | static ssize_t |
2527 | errors_show(mdk_rdev_t *rdev, char *page) | |
2528 | { | |
2529 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2530 | } | |
2531 | ||
2532 | static ssize_t | |
2533 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2534 | { | |
2535 | char *e; | |
2536 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2537 | if (*buf && (*e == 0 || *e == '\n')) { | |
2538 | atomic_set(&rdev->corrected_errors, n); | |
2539 | return len; | |
2540 | } | |
2541 | return -EINVAL; | |
2542 | } | |
2543 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2544 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2545 | |
014236d2 N |
2546 | static ssize_t |
2547 | slot_show(mdk_rdev_t *rdev, char *page) | |
2548 | { | |
2549 | if (rdev->raid_disk < 0) | |
2550 | return sprintf(page, "none\n"); | |
2551 | else | |
2552 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2553 | } | |
2554 | ||
2555 | static ssize_t | |
2556 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2557 | { | |
2558 | char *e; | |
c303da6d | 2559 | int err; |
014236d2 N |
2560 | int slot = simple_strtoul(buf, &e, 10); |
2561 | if (strncmp(buf, "none", 4)==0) | |
2562 | slot = -1; | |
2563 | else if (e==buf || (*e && *e!= '\n')) | |
2564 | return -EINVAL; | |
6c2fce2e | 2565 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2566 | /* Setting 'slot' on an active array requires also |
2567 | * updating the 'rd%d' link, and communicating | |
2568 | * with the personality with ->hot_*_disk. | |
2569 | * For now we only support removing | |
2570 | * failed/spare devices. This normally happens automatically, | |
2571 | * but not when the metadata is externally managed. | |
2572 | */ | |
c303da6d N |
2573 | if (rdev->raid_disk == -1) |
2574 | return -EEXIST; | |
2575 | /* personality does all needed checks */ | |
01393f3d | 2576 | if (rdev->mddev->pers->hot_remove_disk == NULL) |
c303da6d N |
2577 | return -EINVAL; |
2578 | err = rdev->mddev->pers-> | |
2579 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2580 | if (err) | |
2581 | return err; | |
36fad858 | 2582 | sysfs_unlink_rdev(rdev->mddev, rdev); |
b7103107 | 2583 | rdev->raid_disk = -1; |
c303da6d N |
2584 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2585 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2586 | } else if (rdev->mddev->pers) { |
2587 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2588 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2589 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2590 | */ |
2591 | ||
2592 | if (rdev->raid_disk != -1) | |
2593 | return -EBUSY; | |
2594 | ||
c6751b2b N |
2595 | if (test_bit(MD_RECOVERY_RUNNING, &rdev->mddev->recovery)) |
2596 | return -EBUSY; | |
2597 | ||
6c2fce2e NB |
2598 | if (rdev->mddev->pers->hot_add_disk == NULL) |
2599 | return -EINVAL; | |
2600 | ||
159ec1fc | 2601 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2602 | if (rdev2->raid_disk == slot) |
2603 | return -EEXIST; | |
2604 | ||
ba1b41b6 N |
2605 | if (slot >= rdev->mddev->raid_disks && |
2606 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
2607 | return -ENOSPC; | |
2608 | ||
6c2fce2e NB |
2609 | rdev->raid_disk = slot; |
2610 | if (test_bit(In_sync, &rdev->flags)) | |
2611 | rdev->saved_raid_disk = slot; | |
2612 | else | |
2613 | rdev->saved_raid_disk = -1; | |
2614 | err = rdev->mddev->pers-> | |
2615 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2616 | if (err) { |
6c2fce2e | 2617 | rdev->raid_disk = -1; |
6c2fce2e | 2618 | return err; |
52664732 | 2619 | } else |
00bcb4ac | 2620 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
36fad858 | 2621 | if (sysfs_link_rdev(rdev->mddev, rdev)) |
00bcb4ac | 2622 | /* failure here is OK */; |
6c2fce2e | 2623 | /* don't wakeup anyone, leave that to userspace. */ |
c303da6d | 2624 | } else { |
ba1b41b6 N |
2625 | if (slot >= rdev->mddev->raid_disks && |
2626 | slot >= rdev->mddev->raid_disks + rdev->mddev->delta_disks) | |
c303da6d N |
2627 | return -ENOSPC; |
2628 | rdev->raid_disk = slot; | |
2629 | /* assume it is working */ | |
c5d79adb N |
2630 | clear_bit(Faulty, &rdev->flags); |
2631 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2632 | set_bit(In_sync, &rdev->flags); |
00bcb4ac | 2633 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c303da6d | 2634 | } |
014236d2 N |
2635 | return len; |
2636 | } | |
2637 | ||
2638 | ||
2639 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2640 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2641 | |
93c8cad0 N |
2642 | static ssize_t |
2643 | offset_show(mdk_rdev_t *rdev, char *page) | |
2644 | { | |
6961ece4 | 2645 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2646 | } |
2647 | ||
2648 | static ssize_t | |
2649 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2650 | { | |
2651 | char *e; | |
2652 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2653 | if (e==buf || (*e && *e != '\n')) | |
2654 | return -EINVAL; | |
8ed0a521 | 2655 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2656 | return -EBUSY; |
dd8ac336 | 2657 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2658 | /* Must set offset before size, so overlap checks |
2659 | * can be sane */ | |
2660 | return -EBUSY; | |
93c8cad0 N |
2661 | rdev->data_offset = offset; |
2662 | return len; | |
2663 | } | |
2664 | ||
2665 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2666 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2667 | |
83303b61 N |
2668 | static ssize_t |
2669 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2670 | { | |
dd8ac336 | 2671 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2672 | } |
2673 | ||
c5d79adb N |
2674 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2675 | { | |
2676 | /* check if two start/length pairs overlap */ | |
2677 | if (s1+l1 <= s2) | |
2678 | return 0; | |
2679 | if (s2+l2 <= s1) | |
2680 | return 0; | |
2681 | return 1; | |
2682 | } | |
2683 | ||
b522adcd DW |
2684 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2685 | { | |
2686 | unsigned long long blocks; | |
2687 | sector_t new; | |
2688 | ||
2689 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2690 | return -EINVAL; | |
2691 | ||
2692 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2693 | return -EINVAL; /* sector conversion overflow */ | |
2694 | ||
2695 | new = blocks * 2; | |
2696 | if (new != blocks * 2) | |
2697 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2698 | ||
2699 | *sectors = new; | |
2700 | return 0; | |
2701 | } | |
2702 | ||
83303b61 N |
2703 | static ssize_t |
2704 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2705 | { | |
27c529bb | 2706 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2707 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2708 | sector_t sectors; |
27c529bb | 2709 | |
b522adcd | 2710 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2711 | return -EINVAL; |
0cd17fec | 2712 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2713 | if (my_mddev->persistent) { |
dd8ac336 AN |
2714 | sectors = super_types[my_mddev->major_version]. |
2715 | rdev_size_change(rdev, sectors); | |
2716 | if (!sectors) | |
0cd17fec | 2717 | return -EBUSY; |
dd8ac336 | 2718 | } else if (!sectors) |
77304d2a | 2719 | sectors = (i_size_read(rdev->bdev->bd_inode) >> 9) - |
dd8ac336 | 2720 | rdev->data_offset; |
0cd17fec | 2721 | } |
dd8ac336 | 2722 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2723 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2724 | |
dd8ac336 AN |
2725 | rdev->sectors = sectors; |
2726 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2727 | /* need to check that all other rdevs with the same ->bdev |
2728 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2729 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2730 | * we have to change it back, we will have the lock again. |
2731 | */ | |
2732 | mddev_t *mddev; | |
2733 | int overlap = 0; | |
159ec1fc | 2734 | struct list_head *tmp; |
c5d79adb | 2735 | |
27c529bb | 2736 | mddev_unlock(my_mddev); |
29ac4aa3 | 2737 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2738 | mdk_rdev_t *rdev2; |
2739 | ||
2740 | mddev_lock(mddev); | |
159ec1fc | 2741 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
f21e9ff7 N |
2742 | if (rdev->bdev == rdev2->bdev && |
2743 | rdev != rdev2 && | |
2744 | overlaps(rdev->data_offset, rdev->sectors, | |
2745 | rdev2->data_offset, | |
2746 | rdev2->sectors)) { | |
c5d79adb N |
2747 | overlap = 1; |
2748 | break; | |
2749 | } | |
2750 | mddev_unlock(mddev); | |
2751 | if (overlap) { | |
2752 | mddev_put(mddev); | |
2753 | break; | |
2754 | } | |
2755 | } | |
27c529bb | 2756 | mddev_lock(my_mddev); |
c5d79adb N |
2757 | if (overlap) { |
2758 | /* Someone else could have slipped in a size | |
2759 | * change here, but doing so is just silly. | |
dd8ac336 | 2760 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2761 | * safe, and trust userspace not to race with |
2762 | * itself | |
2763 | */ | |
dd8ac336 | 2764 | rdev->sectors = oldsectors; |
c5d79adb N |
2765 | return -EBUSY; |
2766 | } | |
2767 | } | |
83303b61 N |
2768 | return len; |
2769 | } | |
2770 | ||
2771 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2772 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2773 | |
06e3c817 DW |
2774 | |
2775 | static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page) | |
2776 | { | |
2777 | unsigned long long recovery_start = rdev->recovery_offset; | |
2778 | ||
2779 | if (test_bit(In_sync, &rdev->flags) || | |
2780 | recovery_start == MaxSector) | |
2781 | return sprintf(page, "none\n"); | |
2782 | ||
2783 | return sprintf(page, "%llu\n", recovery_start); | |
2784 | } | |
2785 | ||
2786 | static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2787 | { | |
2788 | unsigned long long recovery_start; | |
2789 | ||
2790 | if (cmd_match(buf, "none")) | |
2791 | recovery_start = MaxSector; | |
2792 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2793 | return -EINVAL; | |
2794 | ||
2795 | if (rdev->mddev->pers && | |
2796 | rdev->raid_disk >= 0) | |
2797 | return -EBUSY; | |
2798 | ||
2799 | rdev->recovery_offset = recovery_start; | |
2800 | if (recovery_start == MaxSector) | |
2801 | set_bit(In_sync, &rdev->flags); | |
2802 | else | |
2803 | clear_bit(In_sync, &rdev->flags); | |
2804 | return len; | |
2805 | } | |
2806 | ||
2807 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2808 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2809 | ||
16c791a5 N |
2810 | |
2811 | static ssize_t | |
2812 | badblocks_show(struct badblocks *bb, char *page, int unack); | |
2813 | static ssize_t | |
2814 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack); | |
2815 | ||
2816 | static ssize_t bb_show(mdk_rdev_t *rdev, char *page) | |
2817 | { | |
2818 | return badblocks_show(&rdev->badblocks, page, 0); | |
2819 | } | |
2820 | static ssize_t bb_store(mdk_rdev_t *rdev, const char *page, size_t len) | |
2821 | { | |
2822 | return badblocks_store(&rdev->badblocks, page, len, 0); | |
2823 | } | |
2824 | static struct rdev_sysfs_entry rdev_bad_blocks = | |
2825 | __ATTR(bad_blocks, S_IRUGO|S_IWUSR, bb_show, bb_store); | |
2826 | ||
2827 | ||
2828 | static ssize_t ubb_show(mdk_rdev_t *rdev, char *page) | |
2829 | { | |
2830 | return badblocks_show(&rdev->badblocks, page, 1); | |
2831 | } | |
2832 | static ssize_t ubb_store(mdk_rdev_t *rdev, const char *page, size_t len) | |
2833 | { | |
2834 | return badblocks_store(&rdev->badblocks, page, len, 1); | |
2835 | } | |
2836 | static struct rdev_sysfs_entry rdev_unack_bad_blocks = | |
2837 | __ATTR(unacknowledged_bad_blocks, S_IRUGO|S_IWUSR, ubb_show, ubb_store); | |
2838 | ||
86e6ffdd N |
2839 | static struct attribute *rdev_default_attrs[] = { |
2840 | &rdev_state.attr, | |
4dbcdc75 | 2841 | &rdev_errors.attr, |
014236d2 | 2842 | &rdev_slot.attr, |
93c8cad0 | 2843 | &rdev_offset.attr, |
83303b61 | 2844 | &rdev_size.attr, |
06e3c817 | 2845 | &rdev_recovery_start.attr, |
16c791a5 N |
2846 | &rdev_bad_blocks.attr, |
2847 | &rdev_unack_bad_blocks.attr, | |
86e6ffdd N |
2848 | NULL, |
2849 | }; | |
2850 | static ssize_t | |
2851 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2852 | { | |
2853 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2854 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2855 | mddev_t *mddev = rdev->mddev; |
2856 | ssize_t rv; | |
86e6ffdd N |
2857 | |
2858 | if (!entry->show) | |
2859 | return -EIO; | |
27c529bb N |
2860 | |
2861 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2862 | if (!rv) { | |
2863 | if (rdev->mddev == NULL) | |
2864 | rv = -EBUSY; | |
2865 | else | |
2866 | rv = entry->show(rdev, page); | |
2867 | mddev_unlock(mddev); | |
2868 | } | |
2869 | return rv; | |
86e6ffdd N |
2870 | } |
2871 | ||
2872 | static ssize_t | |
2873 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2874 | const char *page, size_t length) | |
2875 | { | |
2876 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2877 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2878 | ssize_t rv; |
2879 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2880 | |
2881 | if (!entry->store) | |
2882 | return -EIO; | |
67463acb N |
2883 | if (!capable(CAP_SYS_ADMIN)) |
2884 | return -EACCES; | |
27c529bb | 2885 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2886 | if (!rv) { |
27c529bb N |
2887 | if (rdev->mddev == NULL) |
2888 | rv = -EBUSY; | |
2889 | else | |
2890 | rv = entry->store(rdev, page, length); | |
6a51830e | 2891 | mddev_unlock(mddev); |
ca388059 N |
2892 | } |
2893 | return rv; | |
86e6ffdd N |
2894 | } |
2895 | ||
2896 | static void rdev_free(struct kobject *ko) | |
2897 | { | |
2898 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2899 | kfree(rdev); | |
2900 | } | |
52cf25d0 | 2901 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2902 | .show = rdev_attr_show, |
2903 | .store = rdev_attr_store, | |
2904 | }; | |
2905 | static struct kobj_type rdev_ktype = { | |
2906 | .release = rdev_free, | |
2907 | .sysfs_ops = &rdev_sysfs_ops, | |
2908 | .default_attrs = rdev_default_attrs, | |
2909 | }; | |
2910 | ||
2230dfe4 | 2911 | int md_rdev_init(mdk_rdev_t *rdev) |
e8bb9a83 N |
2912 | { |
2913 | rdev->desc_nr = -1; | |
2914 | rdev->saved_raid_disk = -1; | |
2915 | rdev->raid_disk = -1; | |
2916 | rdev->flags = 0; | |
2917 | rdev->data_offset = 0; | |
2918 | rdev->sb_events = 0; | |
2919 | rdev->last_read_error.tv_sec = 0; | |
2920 | rdev->last_read_error.tv_nsec = 0; | |
2699b672 N |
2921 | rdev->sb_loaded = 0; |
2922 | rdev->bb_page = NULL; | |
e8bb9a83 N |
2923 | atomic_set(&rdev->nr_pending, 0); |
2924 | atomic_set(&rdev->read_errors, 0); | |
2925 | atomic_set(&rdev->corrected_errors, 0); | |
2926 | ||
2927 | INIT_LIST_HEAD(&rdev->same_set); | |
2928 | init_waitqueue_head(&rdev->blocked_wait); | |
2230dfe4 N |
2929 | |
2930 | /* Add space to store bad block list. | |
2931 | * This reserves the space even on arrays where it cannot | |
2932 | * be used - I wonder if that matters | |
2933 | */ | |
2934 | rdev->badblocks.count = 0; | |
2935 | rdev->badblocks.shift = 0; | |
2936 | rdev->badblocks.page = kmalloc(PAGE_SIZE, GFP_KERNEL); | |
2937 | seqlock_init(&rdev->badblocks.lock); | |
2938 | if (rdev->badblocks.page == NULL) | |
2939 | return -ENOMEM; | |
2940 | ||
2941 | return 0; | |
e8bb9a83 N |
2942 | } |
2943 | EXPORT_SYMBOL_GPL(md_rdev_init); | |
1da177e4 LT |
2944 | /* |
2945 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2946 | * | |
2947 | * mark the device faulty if: | |
2948 | * | |
2949 | * - the device is nonexistent (zero size) | |
2950 | * - the device has no valid superblock | |
2951 | * | |
2952 | * a faulty rdev _never_ has rdev->sb set. | |
2953 | */ | |
2954 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2955 | { | |
2956 | char b[BDEVNAME_SIZE]; | |
2957 | int err; | |
2958 | mdk_rdev_t *rdev; | |
2959 | sector_t size; | |
2960 | ||
9ffae0cf | 2961 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2962 | if (!rdev) { |
2963 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2964 | return ERR_PTR(-ENOMEM); | |
2965 | } | |
1da177e4 | 2966 | |
2230dfe4 N |
2967 | err = md_rdev_init(rdev); |
2968 | if (err) | |
2969 | goto abort_free; | |
2970 | err = alloc_disk_sb(rdev); | |
2971 | if (err) | |
1da177e4 LT |
2972 | goto abort_free; |
2973 | ||
c5d79adb | 2974 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2975 | if (err) |
2976 | goto abort_free; | |
2977 | ||
f9cb074b | 2978 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2979 | |
77304d2a | 2980 | size = i_size_read(rdev->bdev->bd_inode) >> BLOCK_SIZE_BITS; |
1da177e4 LT |
2981 | if (!size) { |
2982 | printk(KERN_WARNING | |
2983 | "md: %s has zero or unknown size, marking faulty!\n", | |
2984 | bdevname(rdev->bdev,b)); | |
2985 | err = -EINVAL; | |
2986 | goto abort_free; | |
2987 | } | |
2988 | ||
2989 | if (super_format >= 0) { | |
2990 | err = super_types[super_format]. | |
2991 | load_super(rdev, NULL, super_minor); | |
2992 | if (err == -EINVAL) { | |
df968c4e N |
2993 | printk(KERN_WARNING |
2994 | "md: %s does not have a valid v%d.%d " | |
2995 | "superblock, not importing!\n", | |
2996 | bdevname(rdev->bdev,b), | |
2997 | super_format, super_minor); | |
1da177e4 LT |
2998 | goto abort_free; |
2999 | } | |
3000 | if (err < 0) { | |
3001 | printk(KERN_WARNING | |
3002 | "md: could not read %s's sb, not importing!\n", | |
3003 | bdevname(rdev->bdev,b)); | |
3004 | goto abort_free; | |
3005 | } | |
3006 | } | |
6bfe0b49 | 3007 | |
1da177e4 LT |
3008 | return rdev; |
3009 | ||
3010 | abort_free: | |
2699b672 N |
3011 | if (rdev->bdev) |
3012 | unlock_rdev(rdev); | |
3013 | free_disk_sb(rdev); | |
2230dfe4 | 3014 | kfree(rdev->badblocks.page); |
1da177e4 LT |
3015 | kfree(rdev); |
3016 | return ERR_PTR(err); | |
3017 | } | |
3018 | ||
3019 | /* | |
3020 | * Check a full RAID array for plausibility | |
3021 | */ | |
3022 | ||
3023 | ||
a757e64c | 3024 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
3025 | { |
3026 | int i; | |
159ec1fc | 3027 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
3028 | char b[BDEVNAME_SIZE]; |
3029 | ||
3030 | freshest = NULL; | |
d089c6af | 3031 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
3032 | switch (super_types[mddev->major_version]. |
3033 | load_super(rdev, freshest, mddev->minor_version)) { | |
3034 | case 1: | |
3035 | freshest = rdev; | |
3036 | break; | |
3037 | case 0: | |
3038 | break; | |
3039 | default: | |
3040 | printk( KERN_ERR \ | |
3041 | "md: fatal superblock inconsistency in %s" | |
3042 | " -- removing from array\n", | |
3043 | bdevname(rdev->bdev,b)); | |
3044 | kick_rdev_from_array(rdev); | |
3045 | } | |
3046 | ||
3047 | ||
3048 | super_types[mddev->major_version]. | |
3049 | validate_super(mddev, freshest); | |
3050 | ||
3051 | i = 0; | |
d089c6af | 3052 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
3053 | if (mddev->max_disks && |
3054 | (rdev->desc_nr >= mddev->max_disks || | |
3055 | i > mddev->max_disks)) { | |
de01dfad N |
3056 | printk(KERN_WARNING |
3057 | "md: %s: %s: only %d devices permitted\n", | |
3058 | mdname(mddev), bdevname(rdev->bdev, b), | |
3059 | mddev->max_disks); | |
3060 | kick_rdev_from_array(rdev); | |
3061 | continue; | |
3062 | } | |
1da177e4 LT |
3063 | if (rdev != freshest) |
3064 | if (super_types[mddev->major_version]. | |
3065 | validate_super(mddev, rdev)) { | |
3066 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
3067 | " from array!\n", | |
3068 | bdevname(rdev->bdev,b)); | |
3069 | kick_rdev_from_array(rdev); | |
3070 | continue; | |
3071 | } | |
3072 | if (mddev->level == LEVEL_MULTIPATH) { | |
3073 | rdev->desc_nr = i++; | |
3074 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 3075 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 3076 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
3077 | rdev->raid_disk = -1; |
3078 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
3079 | } |
3080 | } | |
1da177e4 LT |
3081 | } |
3082 | ||
72e02075 N |
3083 | /* Read a fixed-point number. |
3084 | * Numbers in sysfs attributes should be in "standard" units where | |
3085 | * possible, so time should be in seconds. | |
3086 | * However we internally use a a much smaller unit such as | |
3087 | * milliseconds or jiffies. | |
3088 | * This function takes a decimal number with a possible fractional | |
3089 | * component, and produces an integer which is the result of | |
3090 | * multiplying that number by 10^'scale'. | |
3091 | * all without any floating-point arithmetic. | |
3092 | */ | |
3093 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
3094 | { | |
3095 | unsigned long result = 0; | |
3096 | long decimals = -1; | |
3097 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
3098 | if (*cp == '.') | |
3099 | decimals = 0; | |
3100 | else if (decimals < scale) { | |
3101 | unsigned int value; | |
3102 | value = *cp - '0'; | |
3103 | result = result * 10 + value; | |
3104 | if (decimals >= 0) | |
3105 | decimals++; | |
3106 | } | |
3107 | cp++; | |
3108 | } | |
3109 | if (*cp == '\n') | |
3110 | cp++; | |
3111 | if (*cp) | |
3112 | return -EINVAL; | |
3113 | if (decimals < 0) | |
3114 | decimals = 0; | |
3115 | while (decimals < scale) { | |
3116 | result *= 10; | |
3117 | decimals ++; | |
3118 | } | |
3119 | *res = result; | |
3120 | return 0; | |
3121 | } | |
3122 | ||
3123 | ||
19052c0e N |
3124 | static void md_safemode_timeout(unsigned long data); |
3125 | ||
16f17b39 N |
3126 | static ssize_t |
3127 | safe_delay_show(mddev_t *mddev, char *page) | |
3128 | { | |
3129 | int msec = (mddev->safemode_delay*1000)/HZ; | |
3130 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
3131 | } | |
3132 | static ssize_t | |
3133 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
3134 | { | |
16f17b39 | 3135 | unsigned long msec; |
97ce0a7f | 3136 | |
72e02075 | 3137 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 3138 | return -EINVAL; |
16f17b39 N |
3139 | if (msec == 0) |
3140 | mddev->safemode_delay = 0; | |
3141 | else { | |
19052c0e | 3142 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
3143 | mddev->safemode_delay = (msec*HZ)/1000; |
3144 | if (mddev->safemode_delay == 0) | |
3145 | mddev->safemode_delay = 1; | |
19052c0e N |
3146 | if (mddev->safemode_delay < old_delay) |
3147 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
3148 | } |
3149 | return len; | |
3150 | } | |
3151 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 3152 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 3153 | |
eae1701f | 3154 | static ssize_t |
96de1e66 | 3155 | level_show(mddev_t *mddev, char *page) |
eae1701f | 3156 | { |
2604b703 | 3157 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 3158 | if (p) |
eae1701f | 3159 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
3160 | else if (mddev->clevel[0]) |
3161 | return sprintf(page, "%s\n", mddev->clevel); | |
3162 | else if (mddev->level != LEVEL_NONE) | |
3163 | return sprintf(page, "%d\n", mddev->level); | |
3164 | else | |
3165 | return 0; | |
eae1701f N |
3166 | } |
3167 | ||
d9d166c2 N |
3168 | static ssize_t |
3169 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
3170 | { | |
f2859af6 | 3171 | char clevel[16]; |
20a49ff6 | 3172 | ssize_t rv = len; |
245f46c2 | 3173 | struct mdk_personality *pers; |
f2859af6 | 3174 | long level; |
245f46c2 | 3175 | void *priv; |
3a981b03 | 3176 | mdk_rdev_t *rdev; |
245f46c2 N |
3177 | |
3178 | if (mddev->pers == NULL) { | |
3179 | if (len == 0) | |
3180 | return 0; | |
3181 | if (len >= sizeof(mddev->clevel)) | |
3182 | return -ENOSPC; | |
3183 | strncpy(mddev->clevel, buf, len); | |
3184 | if (mddev->clevel[len-1] == '\n') | |
3185 | len--; | |
3186 | mddev->clevel[len] = 0; | |
3187 | mddev->level = LEVEL_NONE; | |
3188 | return rv; | |
3189 | } | |
3190 | ||
3191 | /* request to change the personality. Need to ensure: | |
3192 | * - array is not engaged in resync/recovery/reshape | |
3193 | * - old personality can be suspended | |
3194 | * - new personality will access other array. | |
3195 | */ | |
3196 | ||
bb4f1e9d N |
3197 | if (mddev->sync_thread || |
3198 | mddev->reshape_position != MaxSector || | |
3199 | mddev->sysfs_active) | |
d9d166c2 | 3200 | return -EBUSY; |
245f46c2 N |
3201 | |
3202 | if (!mddev->pers->quiesce) { | |
3203 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
3204 | mdname(mddev), mddev->pers->name); | |
3205 | return -EINVAL; | |
3206 | } | |
3207 | ||
3208 | /* Now find the new personality */ | |
f2859af6 | 3209 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 3210 | return -EINVAL; |
f2859af6 DW |
3211 | strncpy(clevel, buf, len); |
3212 | if (clevel[len-1] == '\n') | |
d9d166c2 | 3213 | len--; |
f2859af6 DW |
3214 | clevel[len] = 0; |
3215 | if (strict_strtol(clevel, 10, &level)) | |
3216 | level = LEVEL_NONE; | |
245f46c2 | 3217 | |
f2859af6 DW |
3218 | if (request_module("md-%s", clevel) != 0) |
3219 | request_module("md-level-%s", clevel); | |
245f46c2 | 3220 | spin_lock(&pers_lock); |
f2859af6 | 3221 | pers = find_pers(level, clevel); |
245f46c2 N |
3222 | if (!pers || !try_module_get(pers->owner)) { |
3223 | spin_unlock(&pers_lock); | |
f2859af6 | 3224 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
3225 | return -EINVAL; |
3226 | } | |
3227 | spin_unlock(&pers_lock); | |
3228 | ||
3229 | if (pers == mddev->pers) { | |
3230 | /* Nothing to do! */ | |
3231 | module_put(pers->owner); | |
3232 | return rv; | |
3233 | } | |
3234 | if (!pers->takeover) { | |
3235 | module_put(pers->owner); | |
3236 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3237 | mdname(mddev), clevel); |
245f46c2 N |
3238 | return -EINVAL; |
3239 | } | |
3240 | ||
e93f68a1 N |
3241 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3242 | rdev->new_raid_disk = rdev->raid_disk; | |
3243 | ||
245f46c2 N |
3244 | /* ->takeover must set new_* and/or delta_disks |
3245 | * if it succeeds, and may set them when it fails. | |
3246 | */ | |
3247 | priv = pers->takeover(mddev); | |
3248 | if (IS_ERR(priv)) { | |
3249 | mddev->new_level = mddev->level; | |
3250 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3251 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3252 | mddev->raid_disks -= mddev->delta_disks; |
3253 | mddev->delta_disks = 0; | |
3254 | module_put(pers->owner); | |
3255 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3256 | mdname(mddev), clevel); |
245f46c2 N |
3257 | return PTR_ERR(priv); |
3258 | } | |
3259 | ||
3260 | /* Looks like we have a winner */ | |
3261 | mddev_suspend(mddev); | |
3262 | mddev->pers->stop(mddev); | |
a64c876f N |
3263 | |
3264 | if (mddev->pers->sync_request == NULL && | |
3265 | pers->sync_request != NULL) { | |
3266 | /* need to add the md_redundancy_group */ | |
3267 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3268 | printk(KERN_WARNING | |
3269 | "md: cannot register extra attributes for %s\n", | |
3270 | mdname(mddev)); | |
19fdb9ee | 3271 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3272 | } |
3273 | if (mddev->pers->sync_request != NULL && | |
3274 | pers->sync_request == NULL) { | |
3275 | /* need to remove the md_redundancy_group */ | |
3276 | if (mddev->to_remove == NULL) | |
3277 | mddev->to_remove = &md_redundancy_group; | |
3278 | } | |
3279 | ||
54071b38 TM |
3280 | if (mddev->pers->sync_request == NULL && |
3281 | mddev->external) { | |
3282 | /* We are converting from a no-redundancy array | |
3283 | * to a redundancy array and metadata is managed | |
3284 | * externally so we need to be sure that writes | |
3285 | * won't block due to a need to transition | |
3286 | * clean->dirty | |
3287 | * until external management is started. | |
3288 | */ | |
3289 | mddev->in_sync = 0; | |
3290 | mddev->safemode_delay = 0; | |
3291 | mddev->safemode = 0; | |
3292 | } | |
3293 | ||
e93f68a1 | 3294 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
e93f68a1 N |
3295 | if (rdev->raid_disk < 0) |
3296 | continue; | |
bf2cb0da | 3297 | if (rdev->new_raid_disk >= mddev->raid_disks) |
e93f68a1 N |
3298 | rdev->new_raid_disk = -1; |
3299 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3300 | continue; | |
36fad858 | 3301 | sysfs_unlink_rdev(mddev, rdev); |
e93f68a1 N |
3302 | } |
3303 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3304 | if (rdev->raid_disk < 0) | |
3305 | continue; | |
3306 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3307 | continue; | |
3308 | rdev->raid_disk = rdev->new_raid_disk; | |
3309 | if (rdev->raid_disk < 0) | |
3a981b03 | 3310 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 | 3311 | else { |
36fad858 NK |
3312 | if (sysfs_link_rdev(mddev, rdev)) |
3313 | printk(KERN_WARNING "md: cannot register rd%d" | |
3314 | " for %s after level change\n", | |
3315 | rdev->raid_disk, mdname(mddev)); | |
3a981b03 | 3316 | } |
e93f68a1 N |
3317 | } |
3318 | ||
3319 | module_put(mddev->pers->owner); | |
245f46c2 N |
3320 | mddev->pers = pers; |
3321 | mddev->private = priv; | |
3322 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3323 | mddev->level = mddev->new_level; | |
3324 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3325 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3326 | mddev->delta_disks = 0; |
fee68723 | 3327 | mddev->degraded = 0; |
9af204cf TM |
3328 | if (mddev->pers->sync_request == NULL) { |
3329 | /* this is now an array without redundancy, so | |
3330 | * it must always be in_sync | |
3331 | */ | |
3332 | mddev->in_sync = 1; | |
3333 | del_timer_sync(&mddev->safemode_timer); | |
3334 | } | |
245f46c2 N |
3335 | pers->run(mddev); |
3336 | mddev_resume(mddev); | |
3337 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3338 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3339 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3340 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3341 | md_new_event(mddev); |
d9d166c2 N |
3342 | return rv; |
3343 | } | |
3344 | ||
3345 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3346 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3347 | |
d4dbd025 N |
3348 | |
3349 | static ssize_t | |
3350 | layout_show(mddev_t *mddev, char *page) | |
3351 | { | |
3352 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3353 | if (mddev->reshape_position != MaxSector && |
3354 | mddev->layout != mddev->new_layout) | |
3355 | return sprintf(page, "%d (%d)\n", | |
3356 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3357 | return sprintf(page, "%d\n", mddev->layout); |
3358 | } | |
3359 | ||
3360 | static ssize_t | |
3361 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
3362 | { | |
3363 | char *e; | |
3364 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3365 | |
3366 | if (!*buf || (*e && *e != '\n')) | |
3367 | return -EINVAL; | |
3368 | ||
b3546035 N |
3369 | if (mddev->pers) { |
3370 | int err; | |
50ac168a | 3371 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3372 | return -EBUSY; |
597a711b | 3373 | mddev->new_layout = n; |
50ac168a | 3374 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3375 | if (err) { |
3376 | mddev->new_layout = mddev->layout; | |
b3546035 | 3377 | return err; |
597a711b | 3378 | } |
b3546035 | 3379 | } else { |
08a02ecd | 3380 | mddev->new_layout = n; |
b3546035 N |
3381 | if (mddev->reshape_position == MaxSector) |
3382 | mddev->layout = n; | |
3383 | } | |
d4dbd025 N |
3384 | return len; |
3385 | } | |
3386 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3387 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3388 | |
3389 | ||
eae1701f | 3390 | static ssize_t |
96de1e66 | 3391 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3392 | { |
bb636547 N |
3393 | if (mddev->raid_disks == 0) |
3394 | return 0; | |
08a02ecd N |
3395 | if (mddev->reshape_position != MaxSector && |
3396 | mddev->delta_disks != 0) | |
3397 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3398 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3399 | return sprintf(page, "%d\n", mddev->raid_disks); |
3400 | } | |
3401 | ||
da943b99 N |
3402 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3403 | ||
3404 | static ssize_t | |
3405 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3406 | { | |
da943b99 N |
3407 | char *e; |
3408 | int rv = 0; | |
3409 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3410 | ||
3411 | if (!*buf || (*e && *e != '\n')) | |
3412 | return -EINVAL; | |
3413 | ||
3414 | if (mddev->pers) | |
3415 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3416 | else if (mddev->reshape_position != MaxSector) { |
3417 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3418 | mddev->delta_disks = n - olddisks; | |
3419 | mddev->raid_disks = n; | |
3420 | } else | |
da943b99 N |
3421 | mddev->raid_disks = n; |
3422 | return rv ? rv : len; | |
3423 | } | |
3424 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3425 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3426 | |
3b34380a N |
3427 | static ssize_t |
3428 | chunk_size_show(mddev_t *mddev, char *page) | |
3429 | { | |
08a02ecd | 3430 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3431 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3432 | return sprintf(page, "%d (%d)\n", | |
3433 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3434 | mddev->chunk_sectors << 9); |
3435 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3436 | } |
3437 | ||
3438 | static ssize_t | |
3439 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3440 | { | |
3b34380a N |
3441 | char *e; |
3442 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3443 | ||
3b34380a N |
3444 | if (!*buf || (*e && *e != '\n')) |
3445 | return -EINVAL; | |
3446 | ||
b3546035 N |
3447 | if (mddev->pers) { |
3448 | int err; | |
50ac168a | 3449 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3450 | return -EBUSY; |
597a711b | 3451 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3452 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3453 | if (err) { |
3454 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3455 | return err; |
597a711b | 3456 | } |
b3546035 | 3457 | } else { |
664e7c41 | 3458 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3459 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3460 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3461 | } |
3b34380a N |
3462 | return len; |
3463 | } | |
3464 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3465 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3466 | |
a94213b1 N |
3467 | static ssize_t |
3468 | resync_start_show(mddev_t *mddev, char *page) | |
3469 | { | |
d1a7c503 N |
3470 | if (mddev->recovery_cp == MaxSector) |
3471 | return sprintf(page, "none\n"); | |
a94213b1 N |
3472 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3473 | } | |
3474 | ||
3475 | static ssize_t | |
3476 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3477 | { | |
a94213b1 N |
3478 | char *e; |
3479 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3480 | ||
b098636c | 3481 | if (mddev->pers && !test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
a94213b1 | 3482 | return -EBUSY; |
06e3c817 DW |
3483 | if (cmd_match(buf, "none")) |
3484 | n = MaxSector; | |
3485 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3486 | return -EINVAL; |
3487 | ||
3488 | mddev->recovery_cp = n; | |
3489 | return len; | |
3490 | } | |
3491 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3492 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3493 | |
9e653b63 N |
3494 | /* |
3495 | * The array state can be: | |
3496 | * | |
3497 | * clear | |
3498 | * No devices, no size, no level | |
3499 | * Equivalent to STOP_ARRAY ioctl | |
3500 | * inactive | |
3501 | * May have some settings, but array is not active | |
3502 | * all IO results in error | |
3503 | * When written, doesn't tear down array, but just stops it | |
3504 | * suspended (not supported yet) | |
3505 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3506 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3507 | * readonly |
3508 | * no resync can happen. no superblocks get written. | |
3509 | * write requests fail | |
3510 | * read-auto | |
3511 | * like readonly, but behaves like 'clean' on a write request. | |
3512 | * | |
3513 | * clean - no pending writes, but otherwise active. | |
3514 | * When written to inactive array, starts without resync | |
3515 | * If a write request arrives then | |
3516 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3517 | * if not known, block and switch to write-pending | |
3518 | * If written to an active array that has pending writes, then fails. | |
3519 | * active | |
3520 | * fully active: IO and resync can be happening. | |
3521 | * When written to inactive array, starts with resync | |
3522 | * | |
3523 | * write-pending | |
3524 | * clean, but writes are blocked waiting for 'active' to be written. | |
3525 | * | |
3526 | * active-idle | |
3527 | * like active, but no writes have been seen for a while (100msec). | |
3528 | * | |
3529 | */ | |
3530 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3531 | write_pending, active_idle, bad_word}; | |
05381954 | 3532 | static char *array_states[] = { |
9e653b63 N |
3533 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3534 | "write-pending", "active-idle", NULL }; | |
3535 | ||
3536 | static int match_word(const char *word, char **list) | |
3537 | { | |
3538 | int n; | |
3539 | for (n=0; list[n]; n++) | |
3540 | if (cmd_match(word, list[n])) | |
3541 | break; | |
3542 | return n; | |
3543 | } | |
3544 | ||
3545 | static ssize_t | |
3546 | array_state_show(mddev_t *mddev, char *page) | |
3547 | { | |
3548 | enum array_state st = inactive; | |
3549 | ||
3550 | if (mddev->pers) | |
3551 | switch(mddev->ro) { | |
3552 | case 1: | |
3553 | st = readonly; | |
3554 | break; | |
3555 | case 2: | |
3556 | st = read_auto; | |
3557 | break; | |
3558 | case 0: | |
3559 | if (mddev->in_sync) | |
3560 | st = clean; | |
070dc6dd | 3561 | else if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
e691063a | 3562 | st = write_pending; |
9e653b63 N |
3563 | else if (mddev->safemode) |
3564 | st = active_idle; | |
3565 | else | |
3566 | st = active; | |
3567 | } | |
3568 | else { | |
3569 | if (list_empty(&mddev->disks) && | |
3570 | mddev->raid_disks == 0 && | |
58c0fed4 | 3571 | mddev->dev_sectors == 0) |
9e653b63 N |
3572 | st = clear; |
3573 | else | |
3574 | st = inactive; | |
3575 | } | |
3576 | return sprintf(page, "%s\n", array_states[st]); | |
3577 | } | |
3578 | ||
df5b20cf | 3579 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
a4bd82d0 | 3580 | static int md_set_readonly(mddev_t * mddev, int is_open); |
9e653b63 N |
3581 | static int do_md_run(mddev_t * mddev); |
3582 | static int restart_array(mddev_t *mddev); | |
3583 | ||
3584 | static ssize_t | |
3585 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3586 | { | |
3587 | int err = -EINVAL; | |
3588 | enum array_state st = match_word(buf, array_states); | |
3589 | switch(st) { | |
3590 | case bad_word: | |
3591 | break; | |
3592 | case clear: | |
3593 | /* stopping an active array */ | |
f2ea68cf | 3594 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3595 | return -EBUSY; |
df5b20cf | 3596 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3597 | break; |
3598 | case inactive: | |
3599 | /* stopping an active array */ | |
3600 | if (mddev->pers) { | |
f2ea68cf | 3601 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3602 | return -EBUSY; |
df5b20cf | 3603 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3604 | } else |
3605 | err = 0; /* already inactive */ | |
9e653b63 N |
3606 | break; |
3607 | case suspended: | |
3608 | break; /* not supported yet */ | |
3609 | case readonly: | |
3610 | if (mddev->pers) | |
a4bd82d0 | 3611 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3612 | else { |
3613 | mddev->ro = 1; | |
648b629e | 3614 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3615 | err = do_md_run(mddev); |
3616 | } | |
3617 | break; | |
3618 | case read_auto: | |
9e653b63 | 3619 | if (mddev->pers) { |
80268ee9 | 3620 | if (mddev->ro == 0) |
a4bd82d0 | 3621 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3622 | else if (mddev->ro == 1) |
648b629e N |
3623 | err = restart_array(mddev); |
3624 | if (err == 0) { | |
3625 | mddev->ro = 2; | |
3626 | set_disk_ro(mddev->gendisk, 0); | |
3627 | } | |
9e653b63 N |
3628 | } else { |
3629 | mddev->ro = 2; | |
3630 | err = do_md_run(mddev); | |
3631 | } | |
3632 | break; | |
3633 | case clean: | |
3634 | if (mddev->pers) { | |
3635 | restart_array(mddev); | |
3636 | spin_lock_irq(&mddev->write_lock); | |
3637 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3638 | if (mddev->in_sync == 0) { |
3639 | mddev->in_sync = 1; | |
31a59e34 N |
3640 | if (mddev->safemode == 1) |
3641 | mddev->safemode = 0; | |
070dc6dd | 3642 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
e691063a N |
3643 | } |
3644 | err = 0; | |
3645 | } else | |
3646 | err = -EBUSY; | |
9e653b63 | 3647 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3648 | } else |
3649 | err = -EINVAL; | |
9e653b63 N |
3650 | break; |
3651 | case active: | |
3652 | if (mddev->pers) { | |
3653 | restart_array(mddev); | |
070dc6dd | 3654 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
9e653b63 N |
3655 | wake_up(&mddev->sb_wait); |
3656 | err = 0; | |
3657 | } else { | |
3658 | mddev->ro = 0; | |
648b629e | 3659 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3660 | err = do_md_run(mddev); |
3661 | } | |
3662 | break; | |
3663 | case write_pending: | |
3664 | case active_idle: | |
3665 | /* these cannot be set */ | |
3666 | break; | |
3667 | } | |
3668 | if (err) | |
3669 | return err; | |
0fd62b86 | 3670 | else { |
00bcb4ac | 3671 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
9e653b63 | 3672 | return len; |
0fd62b86 | 3673 | } |
9e653b63 | 3674 | } |
80ca3a44 N |
3675 | static struct md_sysfs_entry md_array_state = |
3676 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3677 | |
1e50915f RB |
3678 | static ssize_t |
3679 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3680 | return sprintf(page, "%d\n", | |
3681 | atomic_read(&mddev->max_corr_read_errors)); | |
3682 | } | |
3683 | ||
3684 | static ssize_t | |
3685 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3686 | { | |
3687 | char *e; | |
3688 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3689 | ||
3690 | if (*buf && (*e == 0 || *e == '\n')) { | |
3691 | atomic_set(&mddev->max_corr_read_errors, n); | |
3692 | return len; | |
3693 | } | |
3694 | return -EINVAL; | |
3695 | } | |
3696 | ||
3697 | static struct md_sysfs_entry max_corr_read_errors = | |
3698 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3699 | max_corrected_read_errors_store); | |
3700 | ||
6d7ff738 N |
3701 | static ssize_t |
3702 | null_show(mddev_t *mddev, char *page) | |
3703 | { | |
3704 | return -EINVAL; | |
3705 | } | |
3706 | ||
3707 | static ssize_t | |
3708 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3709 | { | |
3710 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3711 | /* The new device is added to the array. | |
3712 | * If the array has a persistent superblock, we read the | |
3713 | * superblock to initialise info and check validity. | |
3714 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3715 | * which mainly checks size. | |
3716 | */ | |
3717 | char *e; | |
3718 | int major = simple_strtoul(buf, &e, 10); | |
3719 | int minor; | |
3720 | dev_t dev; | |
3721 | mdk_rdev_t *rdev; | |
3722 | int err; | |
3723 | ||
3724 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3725 | return -EINVAL; | |
3726 | minor = simple_strtoul(e+1, &e, 10); | |
3727 | if (*e && *e != '\n') | |
3728 | return -EINVAL; | |
3729 | dev = MKDEV(major, minor); | |
3730 | if (major != MAJOR(dev) || | |
3731 | minor != MINOR(dev)) | |
3732 | return -EOVERFLOW; | |
3733 | ||
3734 | ||
3735 | if (mddev->persistent) { | |
3736 | rdev = md_import_device(dev, mddev->major_version, | |
3737 | mddev->minor_version); | |
3738 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3739 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3740 | mdk_rdev_t, same_set); | |
3741 | err = super_types[mddev->major_version] | |
3742 | .load_super(rdev, rdev0, mddev->minor_version); | |
3743 | if (err < 0) | |
3744 | goto out; | |
3745 | } | |
c5d79adb N |
3746 | } else if (mddev->external) |
3747 | rdev = md_import_device(dev, -2, -1); | |
3748 | else | |
6d7ff738 N |
3749 | rdev = md_import_device(dev, -1, -1); |
3750 | ||
3751 | if (IS_ERR(rdev)) | |
3752 | return PTR_ERR(rdev); | |
3753 | err = bind_rdev_to_array(rdev, mddev); | |
3754 | out: | |
3755 | if (err) | |
3756 | export_rdev(rdev); | |
3757 | return err ? err : len; | |
3758 | } | |
3759 | ||
3760 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3761 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3762 | |
9b1d1dac PC |
3763 | static ssize_t |
3764 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3765 | { | |
3766 | char *end; | |
3767 | unsigned long chunk, end_chunk; | |
3768 | ||
3769 | if (!mddev->bitmap) | |
3770 | goto out; | |
3771 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3772 | while (*buf) { | |
3773 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3774 | if (buf == end) break; | |
3775 | if (*end == '-') { /* range */ | |
3776 | buf = end + 1; | |
3777 | end_chunk = simple_strtoul(buf, &end, 0); | |
3778 | if (buf == end) break; | |
3779 | } | |
3780 | if (*end && !isspace(*end)) break; | |
3781 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3782 | buf = skip_spaces(end); |
9b1d1dac PC |
3783 | } |
3784 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3785 | out: | |
3786 | return len; | |
3787 | } | |
3788 | ||
3789 | static struct md_sysfs_entry md_bitmap = | |
3790 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3791 | ||
a35b0d69 N |
3792 | static ssize_t |
3793 | size_show(mddev_t *mddev, char *page) | |
3794 | { | |
58c0fed4 AN |
3795 | return sprintf(page, "%llu\n", |
3796 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3797 | } |
3798 | ||
d71f9f88 | 3799 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3800 | |
3801 | static ssize_t | |
3802 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3803 | { | |
3804 | /* If array is inactive, we can reduce the component size, but | |
3805 | * not increase it (except from 0). | |
3806 | * If array is active, we can try an on-line resize | |
3807 | */ | |
b522adcd DW |
3808 | sector_t sectors; |
3809 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3810 | |
58c0fed4 AN |
3811 | if (err < 0) |
3812 | return err; | |
a35b0d69 | 3813 | if (mddev->pers) { |
58c0fed4 | 3814 | err = update_size(mddev, sectors); |
850b2b42 | 3815 | md_update_sb(mddev, 1); |
a35b0d69 | 3816 | } else { |
58c0fed4 AN |
3817 | if (mddev->dev_sectors == 0 || |
3818 | mddev->dev_sectors > sectors) | |
3819 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3820 | else |
3821 | err = -ENOSPC; | |
3822 | } | |
3823 | return err ? err : len; | |
3824 | } | |
3825 | ||
3826 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3827 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3828 | |
8bb93aac N |
3829 | |
3830 | /* Metdata version. | |
e691063a N |
3831 | * This is one of |
3832 | * 'none' for arrays with no metadata (good luck...) | |
3833 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3834 | * or N.M for internally known formats |
3835 | */ | |
3836 | static ssize_t | |
3837 | metadata_show(mddev_t *mddev, char *page) | |
3838 | { | |
3839 | if (mddev->persistent) | |
3840 | return sprintf(page, "%d.%d\n", | |
3841 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3842 | else if (mddev->external) |
3843 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3844 | else |
3845 | return sprintf(page, "none\n"); | |
3846 | } | |
3847 | ||
3848 | static ssize_t | |
3849 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3850 | { | |
3851 | int major, minor; | |
3852 | char *e; | |
ea43ddd8 N |
3853 | /* Changing the details of 'external' metadata is |
3854 | * always permitted. Otherwise there must be | |
3855 | * no devices attached to the array. | |
3856 | */ | |
3857 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3858 | ; | |
3859 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3860 | return -EBUSY; |
3861 | ||
3862 | if (cmd_match(buf, "none")) { | |
3863 | mddev->persistent = 0; | |
e691063a N |
3864 | mddev->external = 0; |
3865 | mddev->major_version = 0; | |
3866 | mddev->minor_version = 90; | |
3867 | return len; | |
3868 | } | |
3869 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3870 | size_t namelen = len-9; |
e691063a N |
3871 | if (namelen >= sizeof(mddev->metadata_type)) |
3872 | namelen = sizeof(mddev->metadata_type)-1; | |
3873 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3874 | mddev->metadata_type[namelen] = 0; | |
3875 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3876 | mddev->metadata_type[--namelen] = 0; | |
3877 | mddev->persistent = 0; | |
3878 | mddev->external = 1; | |
8bb93aac N |
3879 | mddev->major_version = 0; |
3880 | mddev->minor_version = 90; | |
3881 | return len; | |
3882 | } | |
3883 | major = simple_strtoul(buf, &e, 10); | |
3884 | if (e==buf || *e != '.') | |
3885 | return -EINVAL; | |
3886 | buf = e+1; | |
3887 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3888 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3889 | return -EINVAL; |
50511da3 | 3890 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3891 | return -ENOENT; |
3892 | mddev->major_version = major; | |
3893 | mddev->minor_version = minor; | |
3894 | mddev->persistent = 1; | |
e691063a | 3895 | mddev->external = 0; |
8bb93aac N |
3896 | return len; |
3897 | } | |
3898 | ||
3899 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3900 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3901 | |
24dd469d | 3902 | static ssize_t |
7eec314d | 3903 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3904 | { |
7eec314d | 3905 | char *type = "idle"; |
b6a9ce68 N |
3906 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3907 | type = "frozen"; | |
3908 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3909 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3910 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3911 | type = "reshape"; | |
3912 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3913 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3914 | type = "resync"; | |
3915 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3916 | type = "check"; | |
3917 | else | |
3918 | type = "repair"; | |
72a23c21 | 3919 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3920 | type = "recover"; |
3921 | } | |
3922 | return sprintf(page, "%s\n", type); | |
3923 | } | |
3924 | ||
7ebc0be7 N |
3925 | static void reap_sync_thread(mddev_t *mddev); |
3926 | ||
24dd469d | 3927 | static ssize_t |
7eec314d | 3928 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3929 | { |
7eec314d N |
3930 | if (!mddev->pers || !mddev->pers->sync_request) |
3931 | return -EINVAL; | |
3932 | ||
b6a9ce68 N |
3933 | if (cmd_match(page, "frozen")) |
3934 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3935 | else | |
3936 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3937 | ||
3938 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
3939 | if (mddev->sync_thread) { |
3940 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 3941 | reap_sync_thread(mddev); |
7eec314d | 3942 | } |
03c902e1 N |
3943 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3944 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3945 | return -EBUSY; |
72a23c21 NB |
3946 | else if (cmd_match(page, "resync")) |
3947 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3948 | else if (cmd_match(page, "recover")) { | |
3949 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3950 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3951 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3952 | int err; |
3953 | if (mddev->pers->start_reshape == NULL) | |
3954 | return -EINVAL; | |
3955 | err = mddev->pers->start_reshape(mddev); | |
3956 | if (err) | |
3957 | return err; | |
a99ac971 | 3958 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3959 | } else { |
bce74dac | 3960 | if (cmd_match(page, "check")) |
7eec314d | 3961 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3962 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3963 | return -EINVAL; |
3964 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3965 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3966 | } |
03c902e1 | 3967 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3968 | md_wakeup_thread(mddev->thread); |
00bcb4ac | 3969 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
24dd469d N |
3970 | return len; |
3971 | } | |
3972 | ||
9d88883e | 3973 | static ssize_t |
96de1e66 | 3974 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3975 | { |
3976 | return sprintf(page, "%llu\n", | |
3977 | (unsigned long long) mddev->resync_mismatches); | |
3978 | } | |
3979 | ||
80ca3a44 N |
3980 | static struct md_sysfs_entry md_scan_mode = |
3981 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3982 | |
96de1e66 | 3983 | |
80ca3a44 | 3984 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3985 | |
88202a0c N |
3986 | static ssize_t |
3987 | sync_min_show(mddev_t *mddev, char *page) | |
3988 | { | |
3989 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3990 | mddev->sync_speed_min ? "local": "system"); | |
3991 | } | |
3992 | ||
3993 | static ssize_t | |
3994 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3995 | { | |
3996 | int min; | |
3997 | char *e; | |
3998 | if (strncmp(buf, "system", 6)==0) { | |
3999 | mddev->sync_speed_min = 0; | |
4000 | return len; | |
4001 | } | |
4002 | min = simple_strtoul(buf, &e, 10); | |
4003 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
4004 | return -EINVAL; | |
4005 | mddev->sync_speed_min = min; | |
4006 | return len; | |
4007 | } | |
4008 | ||
4009 | static struct md_sysfs_entry md_sync_min = | |
4010 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
4011 | ||
4012 | static ssize_t | |
4013 | sync_max_show(mddev_t *mddev, char *page) | |
4014 | { | |
4015 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
4016 | mddev->sync_speed_max ? "local": "system"); | |
4017 | } | |
4018 | ||
4019 | static ssize_t | |
4020 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
4021 | { | |
4022 | int max; | |
4023 | char *e; | |
4024 | if (strncmp(buf, "system", 6)==0) { | |
4025 | mddev->sync_speed_max = 0; | |
4026 | return len; | |
4027 | } | |
4028 | max = simple_strtoul(buf, &e, 10); | |
4029 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
4030 | return -EINVAL; | |
4031 | mddev->sync_speed_max = max; | |
4032 | return len; | |
4033 | } | |
4034 | ||
4035 | static struct md_sysfs_entry md_sync_max = | |
4036 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
4037 | ||
d7f3d291 IP |
4038 | static ssize_t |
4039 | degraded_show(mddev_t *mddev, char *page) | |
4040 | { | |
4041 | return sprintf(page, "%d\n", mddev->degraded); | |
4042 | } | |
4043 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 4044 | |
90b08710 BS |
4045 | static ssize_t |
4046 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
4047 | { | |
4048 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
4049 | } | |
4050 | ||
4051 | static ssize_t | |
4052 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
4053 | { | |
4054 | long n; | |
4055 | ||
4056 | if (strict_strtol(buf, 10, &n)) | |
4057 | return -EINVAL; | |
4058 | ||
4059 | if (n != 0 && n != 1) | |
4060 | return -EINVAL; | |
4061 | ||
4062 | mddev->parallel_resync = n; | |
4063 | ||
4064 | if (mddev->sync_thread) | |
4065 | wake_up(&resync_wait); | |
4066 | ||
4067 | return len; | |
4068 | } | |
4069 | ||
4070 | /* force parallel resync, even with shared block devices */ | |
4071 | static struct md_sysfs_entry md_sync_force_parallel = | |
4072 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
4073 | sync_force_parallel_show, sync_force_parallel_store); | |
4074 | ||
88202a0c N |
4075 | static ssize_t |
4076 | sync_speed_show(mddev_t *mddev, char *page) | |
4077 | { | |
4078 | unsigned long resync, dt, db; | |
d1a7c503 N |
4079 | if (mddev->curr_resync == 0) |
4080 | return sprintf(page, "none\n"); | |
9687a60c AN |
4081 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
4082 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 4083 | if (!dt) dt++; |
9687a60c AN |
4084 | db = resync - mddev->resync_mark_cnt; |
4085 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
4086 | } |
4087 | ||
80ca3a44 | 4088 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
4089 | |
4090 | static ssize_t | |
4091 | sync_completed_show(mddev_t *mddev, char *page) | |
4092 | { | |
13ae864b | 4093 | unsigned long long max_sectors, resync; |
88202a0c | 4094 | |
acb180b0 N |
4095 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4096 | return sprintf(page, "none\n"); | |
4097 | ||
88202a0c | 4098 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 4099 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 4100 | else |
58c0fed4 | 4101 | max_sectors = mddev->dev_sectors; |
88202a0c | 4102 | |
acb180b0 | 4103 | resync = mddev->curr_resync_completed; |
13ae864b | 4104 | return sprintf(page, "%llu / %llu\n", resync, max_sectors); |
88202a0c N |
4105 | } |
4106 | ||
80ca3a44 | 4107 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 4108 | |
5e96ee65 NB |
4109 | static ssize_t |
4110 | min_sync_show(mddev_t *mddev, char *page) | |
4111 | { | |
4112 | return sprintf(page, "%llu\n", | |
4113 | (unsigned long long)mddev->resync_min); | |
4114 | } | |
4115 | static ssize_t | |
4116 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
4117 | { | |
4118 | unsigned long long min; | |
4119 | if (strict_strtoull(buf, 10, &min)) | |
4120 | return -EINVAL; | |
4121 | if (min > mddev->resync_max) | |
4122 | return -EINVAL; | |
4123 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
4124 | return -EBUSY; | |
4125 | ||
4126 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4127 | if (mddev->chunk_sectors) { |
2ac06c33 | 4128 | sector_t temp = min; |
9d8f0363 | 4129 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
4130 | return -EINVAL; |
4131 | } | |
4132 | mddev->resync_min = min; | |
4133 | ||
4134 | return len; | |
4135 | } | |
4136 | ||
4137 | static struct md_sysfs_entry md_min_sync = | |
4138 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
4139 | ||
c6207277 N |
4140 | static ssize_t |
4141 | max_sync_show(mddev_t *mddev, char *page) | |
4142 | { | |
4143 | if (mddev->resync_max == MaxSector) | |
4144 | return sprintf(page, "max\n"); | |
4145 | else | |
4146 | return sprintf(page, "%llu\n", | |
4147 | (unsigned long long)mddev->resync_max); | |
4148 | } | |
4149 | static ssize_t | |
4150 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
4151 | { | |
4152 | if (strncmp(buf, "max", 3) == 0) | |
4153 | mddev->resync_max = MaxSector; | |
4154 | else { | |
5e96ee65 NB |
4155 | unsigned long long max; |
4156 | if (strict_strtoull(buf, 10, &max)) | |
4157 | return -EINVAL; | |
4158 | if (max < mddev->resync_min) | |
c6207277 N |
4159 | return -EINVAL; |
4160 | if (max < mddev->resync_max && | |
4d484a4a | 4161 | mddev->ro == 0 && |
c6207277 N |
4162 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
4163 | return -EBUSY; | |
4164 | ||
4165 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 4166 | if (mddev->chunk_sectors) { |
2ac06c33 | 4167 | sector_t temp = max; |
9d8f0363 | 4168 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
4169 | return -EINVAL; |
4170 | } | |
4171 | mddev->resync_max = max; | |
4172 | } | |
4173 | wake_up(&mddev->recovery_wait); | |
4174 | return len; | |
4175 | } | |
4176 | ||
4177 | static struct md_sysfs_entry md_max_sync = | |
4178 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
4179 | ||
e464eafd N |
4180 | static ssize_t |
4181 | suspend_lo_show(mddev_t *mddev, char *page) | |
4182 | { | |
4183 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
4184 | } | |
4185 | ||
4186 | static ssize_t | |
4187 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
4188 | { | |
4189 | char *e; | |
4190 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4191 | unsigned long long old = mddev->suspend_lo; |
e464eafd | 4192 | |
b8d966ef N |
4193 | if (mddev->pers == NULL || |
4194 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4195 | return -EINVAL; |
4196 | if (buf == e || (*e && *e != '\n')) | |
4197 | return -EINVAL; | |
23ddff37 N |
4198 | |
4199 | mddev->suspend_lo = new; | |
4200 | if (new >= old) | |
4201 | /* Shrinking suspended region */ | |
e464eafd | 4202 | mddev->pers->quiesce(mddev, 2); |
23ddff37 N |
4203 | else { |
4204 | /* Expanding suspended region - need to wait */ | |
4205 | mddev->pers->quiesce(mddev, 1); | |
4206 | mddev->pers->quiesce(mddev, 0); | |
4207 | } | |
4208 | return len; | |
e464eafd N |
4209 | } |
4210 | static struct md_sysfs_entry md_suspend_lo = | |
4211 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
4212 | ||
4213 | ||
4214 | static ssize_t | |
4215 | suspend_hi_show(mddev_t *mddev, char *page) | |
4216 | { | |
4217 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
4218 | } | |
4219 | ||
4220 | static ssize_t | |
4221 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
4222 | { | |
4223 | char *e; | |
4224 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
23ddff37 | 4225 | unsigned long long old = mddev->suspend_hi; |
e464eafd | 4226 | |
b8d966ef N |
4227 | if (mddev->pers == NULL || |
4228 | mddev->pers->quiesce == NULL) | |
e464eafd N |
4229 | return -EINVAL; |
4230 | if (buf == e || (*e && *e != '\n')) | |
4231 | return -EINVAL; | |
23ddff37 N |
4232 | |
4233 | mddev->suspend_hi = new; | |
4234 | if (new <= old) | |
4235 | /* Shrinking suspended region */ | |
4236 | mddev->pers->quiesce(mddev, 2); | |
4237 | else { | |
4238 | /* Expanding suspended region - need to wait */ | |
e464eafd N |
4239 | mddev->pers->quiesce(mddev, 1); |
4240 | mddev->pers->quiesce(mddev, 0); | |
23ddff37 N |
4241 | } |
4242 | return len; | |
e464eafd N |
4243 | } |
4244 | static struct md_sysfs_entry md_suspend_hi = | |
4245 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4246 | ||
08a02ecd N |
4247 | static ssize_t |
4248 | reshape_position_show(mddev_t *mddev, char *page) | |
4249 | { | |
4250 | if (mddev->reshape_position != MaxSector) | |
4251 | return sprintf(page, "%llu\n", | |
4252 | (unsigned long long)mddev->reshape_position); | |
4253 | strcpy(page, "none\n"); | |
4254 | return 5; | |
4255 | } | |
4256 | ||
4257 | static ssize_t | |
4258 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
4259 | { | |
4260 | char *e; | |
4261 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4262 | if (mddev->pers) | |
4263 | return -EBUSY; | |
4264 | if (buf == e || (*e && *e != '\n')) | |
4265 | return -EINVAL; | |
4266 | mddev->reshape_position = new; | |
4267 | mddev->delta_disks = 0; | |
4268 | mddev->new_level = mddev->level; | |
4269 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4270 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4271 | return len; |
4272 | } | |
4273 | ||
4274 | static struct md_sysfs_entry md_reshape_position = | |
4275 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4276 | reshape_position_store); | |
4277 | ||
b522adcd DW |
4278 | static ssize_t |
4279 | array_size_show(mddev_t *mddev, char *page) | |
4280 | { | |
4281 | if (mddev->external_size) | |
4282 | return sprintf(page, "%llu\n", | |
4283 | (unsigned long long)mddev->array_sectors/2); | |
4284 | else | |
4285 | return sprintf(page, "default\n"); | |
4286 | } | |
4287 | ||
4288 | static ssize_t | |
4289 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
4290 | { | |
4291 | sector_t sectors; | |
4292 | ||
4293 | if (strncmp(buf, "default", 7) == 0) { | |
4294 | if (mddev->pers) | |
4295 | sectors = mddev->pers->size(mddev, 0, 0); | |
4296 | else | |
4297 | sectors = mddev->array_sectors; | |
4298 | ||
4299 | mddev->external_size = 0; | |
4300 | } else { | |
4301 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4302 | return -EINVAL; | |
4303 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4304 | return -E2BIG; |
b522adcd DW |
4305 | |
4306 | mddev->external_size = 1; | |
4307 | } | |
4308 | ||
4309 | mddev->array_sectors = sectors; | |
cbe6ef1d N |
4310 | if (mddev->pers) { |
4311 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e | 4312 | revalidate_disk(mddev->gendisk); |
cbe6ef1d | 4313 | } |
b522adcd DW |
4314 | return len; |
4315 | } | |
4316 | ||
4317 | static struct md_sysfs_entry md_array_size = | |
4318 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4319 | array_size_store); | |
e464eafd | 4320 | |
eae1701f N |
4321 | static struct attribute *md_default_attrs[] = { |
4322 | &md_level.attr, | |
d4dbd025 | 4323 | &md_layout.attr, |
eae1701f | 4324 | &md_raid_disks.attr, |
3b34380a | 4325 | &md_chunk_size.attr, |
a35b0d69 | 4326 | &md_size.attr, |
a94213b1 | 4327 | &md_resync_start.attr, |
8bb93aac | 4328 | &md_metadata.attr, |
6d7ff738 | 4329 | &md_new_device.attr, |
16f17b39 | 4330 | &md_safe_delay.attr, |
9e653b63 | 4331 | &md_array_state.attr, |
08a02ecd | 4332 | &md_reshape_position.attr, |
b522adcd | 4333 | &md_array_size.attr, |
1e50915f | 4334 | &max_corr_read_errors.attr, |
411036fa N |
4335 | NULL, |
4336 | }; | |
4337 | ||
4338 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4339 | &md_scan_mode.attr, |
9d88883e | 4340 | &md_mismatches.attr, |
88202a0c N |
4341 | &md_sync_min.attr, |
4342 | &md_sync_max.attr, | |
4343 | &md_sync_speed.attr, | |
90b08710 | 4344 | &md_sync_force_parallel.attr, |
88202a0c | 4345 | &md_sync_completed.attr, |
5e96ee65 | 4346 | &md_min_sync.attr, |
c6207277 | 4347 | &md_max_sync.attr, |
e464eafd N |
4348 | &md_suspend_lo.attr, |
4349 | &md_suspend_hi.attr, | |
9b1d1dac | 4350 | &md_bitmap.attr, |
d7f3d291 | 4351 | &md_degraded.attr, |
eae1701f N |
4352 | NULL, |
4353 | }; | |
411036fa N |
4354 | static struct attribute_group md_redundancy_group = { |
4355 | .name = NULL, | |
4356 | .attrs = md_redundancy_attrs, | |
4357 | }; | |
4358 | ||
eae1701f N |
4359 | |
4360 | static ssize_t | |
4361 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4362 | { | |
4363 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4364 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4365 | ssize_t rv; |
eae1701f N |
4366 | |
4367 | if (!entry->show) | |
4368 | return -EIO; | |
5dc5cf7d IM |
4369 | rv = mddev_lock(mddev); |
4370 | if (!rv) { | |
4371 | rv = entry->show(mddev, page); | |
4372 | mddev_unlock(mddev); | |
4373 | } | |
96de1e66 | 4374 | return rv; |
eae1701f N |
4375 | } |
4376 | ||
4377 | static ssize_t | |
4378 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4379 | const char *page, size_t length) | |
4380 | { | |
4381 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4382 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4383 | ssize_t rv; |
eae1701f N |
4384 | |
4385 | if (!entry->store) | |
4386 | return -EIO; | |
67463acb N |
4387 | if (!capable(CAP_SYS_ADMIN)) |
4388 | return -EACCES; | |
5dc5cf7d | 4389 | rv = mddev_lock(mddev); |
d3374825 N |
4390 | if (mddev->hold_active == UNTIL_IOCTL) |
4391 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4392 | if (!rv) { |
4393 | rv = entry->store(mddev, page, length); | |
4394 | mddev_unlock(mddev); | |
4395 | } | |
96de1e66 | 4396 | return rv; |
eae1701f N |
4397 | } |
4398 | ||
4399 | static void md_free(struct kobject *ko) | |
4400 | { | |
4401 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4402 | |
4403 | if (mddev->sysfs_state) | |
4404 | sysfs_put(mddev->sysfs_state); | |
4405 | ||
4406 | if (mddev->gendisk) { | |
4407 | del_gendisk(mddev->gendisk); | |
4408 | put_disk(mddev->gendisk); | |
4409 | } | |
4410 | if (mddev->queue) | |
4411 | blk_cleanup_queue(mddev->queue); | |
4412 | ||
eae1701f N |
4413 | kfree(mddev); |
4414 | } | |
4415 | ||
52cf25d0 | 4416 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4417 | .show = md_attr_show, |
4418 | .store = md_attr_store, | |
4419 | }; | |
4420 | static struct kobj_type md_ktype = { | |
4421 | .release = md_free, | |
4422 | .sysfs_ops = &md_sysfs_ops, | |
4423 | .default_attrs = md_default_attrs, | |
4424 | }; | |
4425 | ||
1da177e4 LT |
4426 | int mdp_major = 0; |
4427 | ||
5fd3a17e DW |
4428 | static void mddev_delayed_delete(struct work_struct *ws) |
4429 | { | |
4430 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4431 | ||
43a70507 | 4432 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4433 | kobject_del(&mddev->kobj); |
4434 | kobject_put(&mddev->kobj); | |
4435 | } | |
4436 | ||
efeb53c0 | 4437 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4438 | { |
48c9c27b | 4439 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4440 | mddev_t *mddev = mddev_find(dev); |
4441 | struct gendisk *disk; | |
efeb53c0 N |
4442 | int partitioned; |
4443 | int shift; | |
4444 | int unit; | |
3830c62f | 4445 | int error; |
1da177e4 LT |
4446 | |
4447 | if (!mddev) | |
efeb53c0 N |
4448 | return -ENODEV; |
4449 | ||
4450 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4451 | shift = partitioned ? MdpMinorShift : 0; | |
4452 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4453 | |
e804ac78 TH |
4454 | /* wait for any previous instance of this device to be |
4455 | * completely removed (mddev_delayed_delete). | |
d3374825 | 4456 | */ |
e804ac78 | 4457 | flush_workqueue(md_misc_wq); |
d3374825 | 4458 | |
48c9c27b | 4459 | mutex_lock(&disks_mutex); |
0909dc44 N |
4460 | error = -EEXIST; |
4461 | if (mddev->gendisk) | |
4462 | goto abort; | |
efeb53c0 N |
4463 | |
4464 | if (name) { | |
4465 | /* Need to ensure that 'name' is not a duplicate. | |
4466 | */ | |
4467 | mddev_t *mddev2; | |
4468 | spin_lock(&all_mddevs_lock); | |
4469 | ||
4470 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4471 | if (mddev2->gendisk && | |
4472 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4473 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4474 | goto abort; |
efeb53c0 N |
4475 | } |
4476 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4477 | } |
8b765398 | 4478 | |
0909dc44 | 4479 | error = -ENOMEM; |
8b765398 | 4480 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4481 | if (!mddev->queue) |
4482 | goto abort; | |
409c57f3 N |
4483 | mddev->queue->queuedata = mddev; |
4484 | ||
409c57f3 | 4485 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4486 | |
1da177e4 LT |
4487 | disk = alloc_disk(1 << shift); |
4488 | if (!disk) { | |
8b765398 N |
4489 | blk_cleanup_queue(mddev->queue); |
4490 | mddev->queue = NULL; | |
0909dc44 | 4491 | goto abort; |
1da177e4 | 4492 | } |
efeb53c0 | 4493 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4494 | disk->first_minor = unit << shift; |
efeb53c0 N |
4495 | if (name) |
4496 | strcpy(disk->disk_name, name); | |
4497 | else if (partitioned) | |
1da177e4 | 4498 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4499 | else |
1da177e4 | 4500 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4501 | disk->fops = &md_fops; |
4502 | disk->private_data = mddev; | |
4503 | disk->queue = mddev->queue; | |
b0140891 | 4504 | blk_queue_flush(mddev->queue, REQ_FLUSH | REQ_FUA); |
92850bbd | 4505 | /* Allow extended partitions. This makes the |
d3374825 | 4506 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4507 | * remove it now. |
4508 | */ | |
4509 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 | 4510 | mddev->gendisk = disk; |
b0140891 N |
4511 | /* As soon as we call add_disk(), another thread could get |
4512 | * through to md_open, so make sure it doesn't get too far | |
4513 | */ | |
4514 | mutex_lock(&mddev->open_mutex); | |
4515 | add_disk(disk); | |
4516 | ||
ed9e1982 TH |
4517 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4518 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4519 | if (error) { |
4520 | /* This isn't possible, but as kobject_init_and_add is marked | |
4521 | * __must_check, we must do something with the result | |
4522 | */ | |
5e55e2f5 N |
4523 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4524 | disk->disk_name); | |
0909dc44 N |
4525 | error = 0; |
4526 | } | |
00bcb4ac N |
4527 | if (mddev->kobj.sd && |
4528 | sysfs_create_group(&mddev->kobj, &md_bitmap_group)) | |
43a70507 | 4529 | printk(KERN_DEBUG "pointless warning\n"); |
b0140891 | 4530 | mutex_unlock(&mddev->open_mutex); |
0909dc44 N |
4531 | abort: |
4532 | mutex_unlock(&disks_mutex); | |
00bcb4ac | 4533 | if (!error && mddev->kobj.sd) { |
3830c62f | 4534 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
00bcb4ac | 4535 | mddev->sysfs_state = sysfs_get_dirent_safe(mddev->kobj.sd, "array_state"); |
b62b7590 | 4536 | } |
d3374825 | 4537 | mddev_put(mddev); |
0909dc44 | 4538 | return error; |
efeb53c0 N |
4539 | } |
4540 | ||
4541 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4542 | { | |
4543 | md_alloc(dev, NULL); | |
1da177e4 LT |
4544 | return NULL; |
4545 | } | |
4546 | ||
efeb53c0 N |
4547 | static int add_named_array(const char *val, struct kernel_param *kp) |
4548 | { | |
4549 | /* val must be "md_*" where * is not all digits. | |
4550 | * We allocate an array with a large free minor number, and | |
4551 | * set the name to val. val must not already be an active name. | |
4552 | */ | |
4553 | int len = strlen(val); | |
4554 | char buf[DISK_NAME_LEN]; | |
4555 | ||
4556 | while (len && val[len-1] == '\n') | |
4557 | len--; | |
4558 | if (len >= DISK_NAME_LEN) | |
4559 | return -E2BIG; | |
4560 | strlcpy(buf, val, len+1); | |
4561 | if (strncmp(buf, "md_", 3) != 0) | |
4562 | return -EINVAL; | |
4563 | return md_alloc(0, buf); | |
4564 | } | |
4565 | ||
1da177e4 LT |
4566 | static void md_safemode_timeout(unsigned long data) |
4567 | { | |
4568 | mddev_t *mddev = (mddev_t *) data; | |
4569 | ||
0fd62b86 NB |
4570 | if (!atomic_read(&mddev->writes_pending)) { |
4571 | mddev->safemode = 1; | |
4572 | if (mddev->external) | |
00bcb4ac | 4573 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 | 4574 | } |
1da177e4 LT |
4575 | md_wakeup_thread(mddev->thread); |
4576 | } | |
4577 | ||
6ff8d8ec | 4578 | static int start_dirty_degraded; |
1da177e4 | 4579 | |
390ee602 | 4580 | int md_run(mddev_t *mddev) |
1da177e4 | 4581 | { |
2604b703 | 4582 | int err; |
1da177e4 | 4583 | mdk_rdev_t *rdev; |
2604b703 | 4584 | struct mdk_personality *pers; |
1da177e4 | 4585 | |
a757e64c N |
4586 | if (list_empty(&mddev->disks)) |
4587 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4588 | return -EINVAL; |
1da177e4 LT |
4589 | |
4590 | if (mddev->pers) | |
4591 | return -EBUSY; | |
bb4f1e9d N |
4592 | /* Cannot run until previous stop completes properly */ |
4593 | if (mddev->sysfs_active) | |
4594 | return -EBUSY; | |
b6eb127d | 4595 | |
1da177e4 LT |
4596 | /* |
4597 | * Analyze all RAID superblock(s) | |
4598 | */ | |
1ec4a939 N |
4599 | if (!mddev->raid_disks) { |
4600 | if (!mddev->persistent) | |
4601 | return -EINVAL; | |
a757e64c | 4602 | analyze_sbs(mddev); |
1ec4a939 | 4603 | } |
1da177e4 | 4604 | |
d9d166c2 N |
4605 | if (mddev->level != LEVEL_NONE) |
4606 | request_module("md-level-%d", mddev->level); | |
4607 | else if (mddev->clevel[0]) | |
4608 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4609 | |
4610 | /* | |
4611 | * Drop all container device buffers, from now on | |
4612 | * the only valid external interface is through the md | |
4613 | * device. | |
1da177e4 | 4614 | */ |
159ec1fc | 4615 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4616 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4617 | continue; |
4618 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4619 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4620 | |
4621 | /* perform some consistency tests on the device. | |
4622 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4623 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4624 | */ |
a6ff7e08 JB |
4625 | if (rdev->meta_bdev) { |
4626 | /* Nothing to check */; | |
4627 | } else if (rdev->data_offset < rdev->sb_start) { | |
58c0fed4 AN |
4628 | if (mddev->dev_sectors && |
4629 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4630 | > rdev->sb_start) { |
f0d76d70 N |
4631 | printk("md: %s: data overlaps metadata\n", |
4632 | mdname(mddev)); | |
4633 | return -EINVAL; | |
4634 | } | |
4635 | } else { | |
0f420358 | 4636 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4637 | > rdev->data_offset) { |
4638 | printk("md: %s: metadata overlaps data\n", | |
4639 | mdname(mddev)); | |
4640 | return -EINVAL; | |
4641 | } | |
4642 | } | |
00bcb4ac | 4643 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
4644 | } |
4645 | ||
a167f663 | 4646 | if (mddev->bio_set == NULL) |
a519b26d N |
4647 | mddev->bio_set = bioset_create(BIO_POOL_SIZE, |
4648 | sizeof(mddev_t *)); | |
a167f663 | 4649 | |
1da177e4 | 4650 | spin_lock(&pers_lock); |
d9d166c2 | 4651 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4652 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4653 | spin_unlock(&pers_lock); |
d9d166c2 N |
4654 | if (mddev->level != LEVEL_NONE) |
4655 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4656 | mddev->level); | |
4657 | else | |
4658 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4659 | mddev->clevel); | |
1da177e4 LT |
4660 | return -EINVAL; |
4661 | } | |
2604b703 | 4662 | mddev->pers = pers; |
1da177e4 | 4663 | spin_unlock(&pers_lock); |
34817e8c N |
4664 | if (mddev->level != pers->level) { |
4665 | mddev->level = pers->level; | |
4666 | mddev->new_level = pers->level; | |
4667 | } | |
d9d166c2 | 4668 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4669 | |
f6705578 | 4670 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4671 | pers->start_reshape == NULL) { |
f6705578 N |
4672 | /* This personality cannot handle reshaping... */ |
4673 | mddev->pers = NULL; | |
4674 | module_put(pers->owner); | |
4675 | return -EINVAL; | |
4676 | } | |
4677 | ||
7dd5e7c3 N |
4678 | if (pers->sync_request) { |
4679 | /* Warn if this is a potentially silly | |
4680 | * configuration. | |
4681 | */ | |
4682 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4683 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4684 | int warned = 0; |
159ec1fc CR |
4685 | |
4686 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4687 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4688 | if (rdev < rdev2 && |
4689 | rdev->bdev->bd_contains == | |
4690 | rdev2->bdev->bd_contains) { | |
4691 | printk(KERN_WARNING | |
4692 | "%s: WARNING: %s appears to be" | |
4693 | " on the same physical disk as" | |
4694 | " %s.\n", | |
4695 | mdname(mddev), | |
4696 | bdevname(rdev->bdev,b), | |
4697 | bdevname(rdev2->bdev,b2)); | |
4698 | warned = 1; | |
4699 | } | |
4700 | } | |
159ec1fc | 4701 | |
7dd5e7c3 N |
4702 | if (warned) |
4703 | printk(KERN_WARNING | |
4704 | "True protection against single-disk" | |
4705 | " failure might be compromised.\n"); | |
4706 | } | |
4707 | ||
657390d2 | 4708 | mddev->recovery = 0; |
58c0fed4 AN |
4709 | /* may be over-ridden by personality */ |
4710 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4711 | ||
6ff8d8ec | 4712 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4713 | |
0f9552b5 | 4714 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4715 | mddev->ro = 2; /* read-only, but switch on first write */ |
4716 | ||
b15c2e57 | 4717 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4718 | if (err) |
4719 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4720 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4721 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4722 | " but 'external_size' not in effect?\n", __func__); | |
4723 | printk(KERN_ERR | |
4724 | "md: invalid array_size %llu > default size %llu\n", | |
4725 | (unsigned long long)mddev->array_sectors / 2, | |
4726 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4727 | err = -EINVAL; | |
4728 | mddev->pers->stop(mddev); | |
4729 | } | |
4730 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4731 | err = bitmap_create(mddev); |
4732 | if (err) { | |
4733 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4734 | mdname(mddev), err); | |
4735 | mddev->pers->stop(mddev); | |
4736 | } | |
4737 | } | |
1da177e4 | 4738 | if (err) { |
1da177e4 LT |
4739 | module_put(mddev->pers->owner); |
4740 | mddev->pers = NULL; | |
32a7627c N |
4741 | bitmap_destroy(mddev); |
4742 | return err; | |
1da177e4 | 4743 | } |
5e55e2f5 | 4744 | if (mddev->pers->sync_request) { |
00bcb4ac N |
4745 | if (mddev->kobj.sd && |
4746 | sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
5e55e2f5 N |
4747 | printk(KERN_WARNING |
4748 | "md: cannot register extra attributes for %s\n", | |
4749 | mdname(mddev)); | |
00bcb4ac | 4750 | mddev->sysfs_action = sysfs_get_dirent_safe(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4751 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4752 | mddev->ro = 0; |
4753 | ||
1da177e4 | 4754 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4755 | atomic_set(&mddev->max_corr_read_errors, |
4756 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4757 | mddev->safemode = 0; |
4758 | mddev->safemode_timer.function = md_safemode_timeout; | |
4759 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4760 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4761 | mddev->in_sync = 1; |
0ca69886 N |
4762 | smp_wmb(); |
4763 | mddev->ready = 1; | |
159ec1fc | 4764 | list_for_each_entry(rdev, &mddev->disks, same_set) |
36fad858 NK |
4765 | if (rdev->raid_disk >= 0) |
4766 | if (sysfs_link_rdev(mddev, rdev)) | |
00bcb4ac | 4767 | /* failure here is OK */; |
1da177e4 LT |
4768 | |
4769 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4770 | ||
850b2b42 N |
4771 | if (mddev->flags) |
4772 | md_update_sb(mddev, 0); | |
1da177e4 | 4773 | |
d7603b7e | 4774 | md_new_event(mddev); |
00bcb4ac N |
4775 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
4776 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
a99ac971 | 4777 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4778 | return 0; |
4779 | } | |
390ee602 | 4780 | EXPORT_SYMBOL_GPL(md_run); |
1da177e4 | 4781 | |
fe60b014 N |
4782 | static int do_md_run(mddev_t *mddev) |
4783 | { | |
4784 | int err; | |
4785 | ||
4786 | err = md_run(mddev); | |
4787 | if (err) | |
4788 | goto out; | |
69e51b44 N |
4789 | err = bitmap_load(mddev); |
4790 | if (err) { | |
4791 | bitmap_destroy(mddev); | |
4792 | goto out; | |
4793 | } | |
0fd018af JB |
4794 | |
4795 | md_wakeup_thread(mddev->thread); | |
4796 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
4797 | ||
fe60b014 N |
4798 | set_capacity(mddev->gendisk, mddev->array_sectors); |
4799 | revalidate_disk(mddev->gendisk); | |
f0b4f7e2 | 4800 | mddev->changed = 1; |
fe60b014 N |
4801 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
4802 | out: | |
4803 | return err; | |
4804 | } | |
4805 | ||
1da177e4 LT |
4806 | static int restart_array(mddev_t *mddev) |
4807 | { | |
4808 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4809 | |
80fab1d7 | 4810 | /* Complain if it has no devices */ |
1da177e4 | 4811 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4812 | return -ENXIO; |
4813 | if (!mddev->pers) | |
4814 | return -EINVAL; | |
4815 | if (!mddev->ro) | |
4816 | return -EBUSY; | |
4817 | mddev->safemode = 0; | |
4818 | mddev->ro = 0; | |
4819 | set_disk_ro(disk, 0); | |
4820 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4821 | mdname(mddev)); | |
4822 | /* Kick recovery or resync if necessary */ | |
4823 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4824 | md_wakeup_thread(mddev->thread); | |
4825 | md_wakeup_thread(mddev->sync_thread); | |
00bcb4ac | 4826 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
80fab1d7 | 4827 | return 0; |
1da177e4 LT |
4828 | } |
4829 | ||
acc55e22 N |
4830 | /* similar to deny_write_access, but accounts for our holding a reference |
4831 | * to the file ourselves */ | |
4832 | static int deny_bitmap_write_access(struct file * file) | |
4833 | { | |
4834 | struct inode *inode = file->f_mapping->host; | |
4835 | ||
4836 | spin_lock(&inode->i_lock); | |
4837 | if (atomic_read(&inode->i_writecount) > 1) { | |
4838 | spin_unlock(&inode->i_lock); | |
4839 | return -ETXTBSY; | |
4840 | } | |
4841 | atomic_set(&inode->i_writecount, -1); | |
4842 | spin_unlock(&inode->i_lock); | |
4843 | ||
4844 | return 0; | |
4845 | } | |
4846 | ||
43a70507 | 4847 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4848 | { |
4849 | struct inode *inode = file->f_mapping->host; | |
4850 | ||
4851 | spin_lock(&inode->i_lock); | |
4852 | atomic_set(&inode->i_writecount, 1); | |
4853 | spin_unlock(&inode->i_lock); | |
4854 | } | |
4855 | ||
6177b472 N |
4856 | static void md_clean(mddev_t *mddev) |
4857 | { | |
4858 | mddev->array_sectors = 0; | |
4859 | mddev->external_size = 0; | |
4860 | mddev->dev_sectors = 0; | |
4861 | mddev->raid_disks = 0; | |
4862 | mddev->recovery_cp = 0; | |
4863 | mddev->resync_min = 0; | |
4864 | mddev->resync_max = MaxSector; | |
4865 | mddev->reshape_position = MaxSector; | |
4866 | mddev->external = 0; | |
4867 | mddev->persistent = 0; | |
4868 | mddev->level = LEVEL_NONE; | |
4869 | mddev->clevel[0] = 0; | |
4870 | mddev->flags = 0; | |
4871 | mddev->ro = 0; | |
4872 | mddev->metadata_type[0] = 0; | |
4873 | mddev->chunk_sectors = 0; | |
4874 | mddev->ctime = mddev->utime = 0; | |
4875 | mddev->layout = 0; | |
4876 | mddev->max_disks = 0; | |
4877 | mddev->events = 0; | |
a8707c08 | 4878 | mddev->can_decrease_events = 0; |
6177b472 N |
4879 | mddev->delta_disks = 0; |
4880 | mddev->new_level = LEVEL_NONE; | |
4881 | mddev->new_layout = 0; | |
4882 | mddev->new_chunk_sectors = 0; | |
4883 | mddev->curr_resync = 0; | |
4884 | mddev->resync_mismatches = 0; | |
4885 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4886 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4887 | mddev->recovery = 0; | |
4888 | mddev->in_sync = 0; | |
f0b4f7e2 | 4889 | mddev->changed = 0; |
6177b472 | 4890 | mddev->degraded = 0; |
6177b472 N |
4891 | mddev->safemode = 0; |
4892 | mddev->bitmap_info.offset = 0; | |
4893 | mddev->bitmap_info.default_offset = 0; | |
4894 | mddev->bitmap_info.chunksize = 0; | |
4895 | mddev->bitmap_info.daemon_sleep = 0; | |
4896 | mddev->bitmap_info.max_write_behind = 0; | |
4897 | } | |
4898 | ||
defad61a | 4899 | static void __md_stop_writes(mddev_t *mddev) |
a047e125 N |
4900 | { |
4901 | if (mddev->sync_thread) { | |
4902 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4903 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7ebc0be7 | 4904 | reap_sync_thread(mddev); |
a047e125 N |
4905 | } |
4906 | ||
4907 | del_timer_sync(&mddev->safemode_timer); | |
4908 | ||
4909 | bitmap_flush(mddev); | |
4910 | md_super_wait(mddev); | |
4911 | ||
4912 | if (!mddev->in_sync || mddev->flags) { | |
4913 | /* mark array as shutdown cleanly */ | |
4914 | mddev->in_sync = 1; | |
4915 | md_update_sb(mddev, 1); | |
4916 | } | |
4917 | } | |
defad61a N |
4918 | |
4919 | void md_stop_writes(mddev_t *mddev) | |
4920 | { | |
4921 | mddev_lock(mddev); | |
4922 | __md_stop_writes(mddev); | |
4923 | mddev_unlock(mddev); | |
4924 | } | |
390ee602 | 4925 | EXPORT_SYMBOL_GPL(md_stop_writes); |
a047e125 | 4926 | |
390ee602 | 4927 | void md_stop(mddev_t *mddev) |
6177b472 | 4928 | { |
0ca69886 | 4929 | mddev->ready = 0; |
6177b472 N |
4930 | mddev->pers->stop(mddev); |
4931 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
4932 | mddev->to_remove = &md_redundancy_group; | |
4933 | module_put(mddev->pers->owner); | |
4934 | mddev->pers = NULL; | |
cca9cf90 | 4935 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 | 4936 | } |
390ee602 | 4937 | EXPORT_SYMBOL_GPL(md_stop); |
6177b472 | 4938 | |
a4bd82d0 N |
4939 | static int md_set_readonly(mddev_t *mddev, int is_open) |
4940 | { | |
4941 | int err = 0; | |
4942 | mutex_lock(&mddev->open_mutex); | |
4943 | if (atomic_read(&mddev->openers) > is_open) { | |
4944 | printk("md: %s still in use.\n",mdname(mddev)); | |
4945 | err = -EBUSY; | |
4946 | goto out; | |
4947 | } | |
4948 | if (mddev->pers) { | |
defad61a | 4949 | __md_stop_writes(mddev); |
a4bd82d0 N |
4950 | |
4951 | err = -ENXIO; | |
4952 | if (mddev->ro==1) | |
4953 | goto out; | |
4954 | mddev->ro = 1; | |
4955 | set_disk_ro(mddev->gendisk, 1); | |
4956 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
00bcb4ac | 4957 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
a4bd82d0 N |
4958 | err = 0; |
4959 | } | |
4960 | out: | |
4961 | mutex_unlock(&mddev->open_mutex); | |
4962 | return err; | |
4963 | } | |
4964 | ||
9e653b63 N |
4965 | /* mode: |
4966 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
4967 | * 2 - stop but do not disassemble array |
4968 | */ | |
df5b20cf | 4969 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 | 4970 | { |
1da177e4 | 4971 | struct gendisk *disk = mddev->gendisk; |
c4647292 | 4972 | mdk_rdev_t *rdev; |
1da177e4 | 4973 | |
c8c00a69 | 4974 | mutex_lock(&mddev->open_mutex); |
bb4f1e9d N |
4975 | if (atomic_read(&mddev->openers) > is_open || |
4976 | mddev->sysfs_active) { | |
df5b20cf | 4977 | printk("md: %s still in use.\n",mdname(mddev)); |
6e17b027 N |
4978 | mutex_unlock(&mddev->open_mutex); |
4979 | return -EBUSY; | |
4980 | } | |
1da177e4 | 4981 | |
6e17b027 | 4982 | if (mddev->pers) { |
a4bd82d0 N |
4983 | if (mddev->ro) |
4984 | set_disk_ro(disk, 0); | |
409c57f3 | 4985 | |
defad61a | 4986 | __md_stop_writes(mddev); |
a4bd82d0 N |
4987 | md_stop(mddev); |
4988 | mddev->queue->merge_bvec_fn = NULL; | |
a4bd82d0 | 4989 | mddev->queue->backing_dev_info.congested_fn = NULL; |
6177b472 | 4990 | |
a4bd82d0 | 4991 | /* tell userspace to handle 'inactive' */ |
00bcb4ac | 4992 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0d4ca600 | 4993 | |
a4bd82d0 | 4994 | list_for_each_entry(rdev, &mddev->disks, same_set) |
36fad858 NK |
4995 | if (rdev->raid_disk >= 0) |
4996 | sysfs_unlink_rdev(mddev, rdev); | |
c4647292 | 4997 | |
a4bd82d0 | 4998 | set_capacity(disk, 0); |
6e17b027 | 4999 | mutex_unlock(&mddev->open_mutex); |
f0b4f7e2 | 5000 | mddev->changed = 1; |
a4bd82d0 | 5001 | revalidate_disk(disk); |
0d4ca600 | 5002 | |
a4bd82d0 N |
5003 | if (mddev->ro) |
5004 | mddev->ro = 0; | |
6e17b027 N |
5005 | } else |
5006 | mutex_unlock(&mddev->open_mutex); | |
1da177e4 LT |
5007 | /* |
5008 | * Free resources if final stop | |
5009 | */ | |
9e653b63 | 5010 | if (mode == 0) { |
1da177e4 LT |
5011 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
5012 | ||
978f946b | 5013 | bitmap_destroy(mddev); |
c3d9714e N |
5014 | if (mddev->bitmap_info.file) { |
5015 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5016 | fput(mddev->bitmap_info.file); | |
5017 | mddev->bitmap_info.file = NULL; | |
978f946b | 5018 | } |
c3d9714e | 5019 | mddev->bitmap_info.offset = 0; |
978f946b | 5020 | |
1da177e4 LT |
5021 | export_array(mddev); |
5022 | ||
6177b472 | 5023 | md_clean(mddev); |
934d9c23 | 5024 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
5025 | if (mddev->hold_active == UNTIL_STOP) |
5026 | mddev->hold_active = 0; | |
a4bd82d0 | 5027 | } |
3f9d99c1 | 5028 | blk_integrity_unregister(disk); |
d7603b7e | 5029 | md_new_event(mddev); |
00bcb4ac | 5030 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
6e17b027 | 5031 | return 0; |
1da177e4 LT |
5032 | } |
5033 | ||
fdee8ae4 | 5034 | #ifndef MODULE |
1da177e4 LT |
5035 | static void autorun_array(mddev_t *mddev) |
5036 | { | |
5037 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5038 | int err; |
5039 | ||
a757e64c | 5040 | if (list_empty(&mddev->disks)) |
1da177e4 | 5041 | return; |
1da177e4 LT |
5042 | |
5043 | printk(KERN_INFO "md: running: "); | |
5044 | ||
159ec1fc | 5045 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
5046 | char b[BDEVNAME_SIZE]; |
5047 | printk("<%s>", bdevname(rdev->bdev,b)); | |
5048 | } | |
5049 | printk("\n"); | |
5050 | ||
d710e138 | 5051 | err = do_md_run(mddev); |
1da177e4 LT |
5052 | if (err) { |
5053 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 5054 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
5055 | } |
5056 | } | |
5057 | ||
5058 | /* | |
5059 | * lets try to run arrays based on all disks that have arrived | |
5060 | * until now. (those are in pending_raid_disks) | |
5061 | * | |
5062 | * the method: pick the first pending disk, collect all disks with | |
5063 | * the same UUID, remove all from the pending list and put them into | |
5064 | * the 'same_array' list. Then order this list based on superblock | |
5065 | * update time (freshest comes first), kick out 'old' disks and | |
5066 | * compare superblocks. If everything's fine then run it. | |
5067 | * | |
5068 | * If "unit" is allocated, then bump its reference count | |
5069 | */ | |
5070 | static void autorun_devices(int part) | |
5071 | { | |
159ec1fc | 5072 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
5073 | mddev_t *mddev; |
5074 | char b[BDEVNAME_SIZE]; | |
5075 | ||
5076 | printk(KERN_INFO "md: autorun ...\n"); | |
5077 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 5078 | int unit; |
1da177e4 | 5079 | dev_t dev; |
ad01c9e3 | 5080 | LIST_HEAD(candidates); |
1da177e4 LT |
5081 | rdev0 = list_entry(pending_raid_disks.next, |
5082 | mdk_rdev_t, same_set); | |
5083 | ||
5084 | printk(KERN_INFO "md: considering %s ...\n", | |
5085 | bdevname(rdev0->bdev,b)); | |
5086 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 5087 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
5088 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
5089 | printk(KERN_INFO "md: adding %s ...\n", | |
5090 | bdevname(rdev->bdev,b)); | |
5091 | list_move(&rdev->same_set, &candidates); | |
5092 | } | |
5093 | /* | |
5094 | * now we have a set of devices, with all of them having | |
5095 | * mostly sane superblocks. It's time to allocate the | |
5096 | * mddev. | |
5097 | */ | |
e8703fe1 N |
5098 | if (part) { |
5099 | dev = MKDEV(mdp_major, | |
5100 | rdev0->preferred_minor << MdpMinorShift); | |
5101 | unit = MINOR(dev) >> MdpMinorShift; | |
5102 | } else { | |
5103 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
5104 | unit = MINOR(dev); | |
5105 | } | |
5106 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
5107 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
5108 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
5109 | break; | |
5110 | } | |
1da177e4 LT |
5111 | |
5112 | md_probe(dev, NULL, NULL); | |
5113 | mddev = mddev_find(dev); | |
9bbbca3a NB |
5114 | if (!mddev || !mddev->gendisk) { |
5115 | if (mddev) | |
5116 | mddev_put(mddev); | |
5117 | printk(KERN_ERR | |
1da177e4 LT |
5118 | "md: cannot allocate memory for md drive.\n"); |
5119 | break; | |
5120 | } | |
5121 | if (mddev_lock(mddev)) | |
5122 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
5123 | mdname(mddev)); | |
5124 | else if (mddev->raid_disks || mddev->major_version | |
5125 | || !list_empty(&mddev->disks)) { | |
5126 | printk(KERN_WARNING | |
5127 | "md: %s already running, cannot run %s\n", | |
5128 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
5129 | mddev_unlock(mddev); | |
5130 | } else { | |
5131 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 5132 | mddev->persistent = 1; |
159ec1fc | 5133 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
5134 | list_del_init(&rdev->same_set); |
5135 | if (bind_rdev_to_array(rdev, mddev)) | |
5136 | export_rdev(rdev); | |
5137 | } | |
5138 | autorun_array(mddev); | |
5139 | mddev_unlock(mddev); | |
5140 | } | |
5141 | /* on success, candidates will be empty, on error | |
5142 | * it won't... | |
5143 | */ | |
159ec1fc | 5144 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 5145 | list_del_init(&rdev->same_set); |
1da177e4 | 5146 | export_rdev(rdev); |
4b80991c | 5147 | } |
1da177e4 LT |
5148 | mddev_put(mddev); |
5149 | } | |
5150 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
5151 | } | |
fdee8ae4 | 5152 | #endif /* !MODULE */ |
1da177e4 | 5153 | |
1da177e4 LT |
5154 | static int get_version(void __user * arg) |
5155 | { | |
5156 | mdu_version_t ver; | |
5157 | ||
5158 | ver.major = MD_MAJOR_VERSION; | |
5159 | ver.minor = MD_MINOR_VERSION; | |
5160 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
5161 | ||
5162 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
5163 | return -EFAULT; | |
5164 | ||
5165 | return 0; | |
5166 | } | |
5167 | ||
5168 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
5169 | { | |
5170 | mdu_array_info_t info; | |
a9f326eb | 5171 | int nr,working,insync,failed,spare; |
1da177e4 | 5172 | mdk_rdev_t *rdev; |
1da177e4 | 5173 | |
a9f326eb | 5174 | nr=working=insync=failed=spare=0; |
159ec1fc | 5175 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 5176 | nr++; |
b2d444d7 | 5177 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
5178 | failed++; |
5179 | else { | |
5180 | working++; | |
b2d444d7 | 5181 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 5182 | insync++; |
1da177e4 LT |
5183 | else |
5184 | spare++; | |
5185 | } | |
5186 | } | |
5187 | ||
5188 | info.major_version = mddev->major_version; | |
5189 | info.minor_version = mddev->minor_version; | |
5190 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
5191 | info.ctime = mddev->ctime; | |
5192 | info.level = mddev->level; | |
58c0fed4 AN |
5193 | info.size = mddev->dev_sectors / 2; |
5194 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 5195 | info.size = -1; |
1da177e4 LT |
5196 | info.nr_disks = nr; |
5197 | info.raid_disks = mddev->raid_disks; | |
5198 | info.md_minor = mddev->md_minor; | |
5199 | info.not_persistent= !mddev->persistent; | |
5200 | ||
5201 | info.utime = mddev->utime; | |
5202 | info.state = 0; | |
5203 | if (mddev->in_sync) | |
5204 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 5205 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5206 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 5207 | info.active_disks = insync; |
1da177e4 LT |
5208 | info.working_disks = working; |
5209 | info.failed_disks = failed; | |
5210 | info.spare_disks = spare; | |
5211 | ||
5212 | info.layout = mddev->layout; | |
9d8f0363 | 5213 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
5214 | |
5215 | if (copy_to_user(arg, &info, sizeof(info))) | |
5216 | return -EFAULT; | |
5217 | ||
5218 | return 0; | |
5219 | } | |
5220 | ||
87162a28 | 5221 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
5222 | { |
5223 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
5224 | char *ptr, *buf = NULL; | |
5225 | int err = -ENOMEM; | |
5226 | ||
b5470dc5 DW |
5227 | if (md_allow_write(mddev)) |
5228 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
5229 | else | |
5230 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 5231 | |
32a7627c N |
5232 | if (!file) |
5233 | goto out; | |
5234 | ||
5235 | /* bitmap disabled, zero the first byte and copy out */ | |
5236 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
5237 | file->pathname[0] = '\0'; | |
5238 | goto copy_out; | |
5239 | } | |
5240 | ||
5241 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
5242 | if (!buf) | |
5243 | goto out; | |
5244 | ||
6bcfd601 CH |
5245 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
5246 | if (IS_ERR(ptr)) | |
32a7627c N |
5247 | goto out; |
5248 | ||
5249 | strcpy(file->pathname, ptr); | |
5250 | ||
5251 | copy_out: | |
5252 | err = 0; | |
5253 | if (copy_to_user(arg, file, sizeof(*file))) | |
5254 | err = -EFAULT; | |
5255 | out: | |
5256 | kfree(buf); | |
5257 | kfree(file); | |
5258 | return err; | |
5259 | } | |
5260 | ||
1da177e4 LT |
5261 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
5262 | { | |
5263 | mdu_disk_info_t info; | |
1da177e4 LT |
5264 | mdk_rdev_t *rdev; |
5265 | ||
5266 | if (copy_from_user(&info, arg, sizeof(info))) | |
5267 | return -EFAULT; | |
5268 | ||
26ef379f | 5269 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5270 | if (rdev) { |
5271 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5272 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5273 | info.raid_disk = rdev->raid_disk; | |
5274 | info.state = 0; | |
b2d444d7 | 5275 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5276 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5277 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5278 | info.state |= (1<<MD_DISK_ACTIVE); |
5279 | info.state |= (1<<MD_DISK_SYNC); | |
5280 | } | |
8ddf9efe N |
5281 | if (test_bit(WriteMostly, &rdev->flags)) |
5282 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5283 | } else { |
5284 | info.major = info.minor = 0; | |
5285 | info.raid_disk = -1; | |
5286 | info.state = (1<<MD_DISK_REMOVED); | |
5287 | } | |
5288 | ||
5289 | if (copy_to_user(arg, &info, sizeof(info))) | |
5290 | return -EFAULT; | |
5291 | ||
5292 | return 0; | |
5293 | } | |
5294 | ||
5295 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
5296 | { | |
5297 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
5298 | mdk_rdev_t *rdev; | |
5299 | dev_t dev = MKDEV(info->major,info->minor); | |
5300 | ||
5301 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5302 | return -EOVERFLOW; | |
5303 | ||
5304 | if (!mddev->raid_disks) { | |
5305 | int err; | |
5306 | /* expecting a device which has a superblock */ | |
5307 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5308 | if (IS_ERR(rdev)) { | |
5309 | printk(KERN_WARNING | |
5310 | "md: md_import_device returned %ld\n", | |
5311 | PTR_ERR(rdev)); | |
5312 | return PTR_ERR(rdev); | |
5313 | } | |
5314 | if (!list_empty(&mddev->disks)) { | |
5315 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
5316 | mdk_rdev_t, same_set); | |
a9f326eb | 5317 | err = super_types[mddev->major_version] |
1da177e4 LT |
5318 | .load_super(rdev, rdev0, mddev->minor_version); |
5319 | if (err < 0) { | |
5320 | printk(KERN_WARNING | |
5321 | "md: %s has different UUID to %s\n", | |
5322 | bdevname(rdev->bdev,b), | |
5323 | bdevname(rdev0->bdev,b2)); | |
5324 | export_rdev(rdev); | |
5325 | return -EINVAL; | |
5326 | } | |
5327 | } | |
5328 | err = bind_rdev_to_array(rdev, mddev); | |
5329 | if (err) | |
5330 | export_rdev(rdev); | |
5331 | return err; | |
5332 | } | |
5333 | ||
5334 | /* | |
5335 | * add_new_disk can be used once the array is assembled | |
5336 | * to add "hot spares". They must already have a superblock | |
5337 | * written | |
5338 | */ | |
5339 | if (mddev->pers) { | |
5340 | int err; | |
5341 | if (!mddev->pers->hot_add_disk) { | |
5342 | printk(KERN_WARNING | |
5343 | "%s: personality does not support diskops!\n", | |
5344 | mdname(mddev)); | |
5345 | return -EINVAL; | |
5346 | } | |
7b1e35f6 N |
5347 | if (mddev->persistent) |
5348 | rdev = md_import_device(dev, mddev->major_version, | |
5349 | mddev->minor_version); | |
5350 | else | |
5351 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5352 | if (IS_ERR(rdev)) { |
5353 | printk(KERN_WARNING | |
5354 | "md: md_import_device returned %ld\n", | |
5355 | PTR_ERR(rdev)); | |
5356 | return PTR_ERR(rdev); | |
5357 | } | |
1a855a06 | 5358 | /* set saved_raid_disk if appropriate */ |
41158c7e N |
5359 | if (!mddev->persistent) { |
5360 | if (info->state & (1<<MD_DISK_SYNC) && | |
bf572541 | 5361 | info->raid_disk < mddev->raid_disks) { |
41158c7e | 5362 | rdev->raid_disk = info->raid_disk; |
bf572541 N |
5363 | set_bit(In_sync, &rdev->flags); |
5364 | } else | |
41158c7e N |
5365 | rdev->raid_disk = -1; |
5366 | } else | |
5367 | super_types[mddev->major_version]. | |
5368 | validate_super(mddev, rdev); | |
bedd86b7 N |
5369 | if ((info->state & (1<<MD_DISK_SYNC)) && |
5370 | (!test_bit(In_sync, &rdev->flags) || | |
5371 | rdev->raid_disk != info->raid_disk)) { | |
5372 | /* This was a hot-add request, but events doesn't | |
5373 | * match, so reject it. | |
5374 | */ | |
5375 | export_rdev(rdev); | |
5376 | return -EINVAL; | |
5377 | } | |
5378 | ||
1a855a06 N |
5379 | if (test_bit(In_sync, &rdev->flags)) |
5380 | rdev->saved_raid_disk = rdev->raid_disk; | |
5381 | else | |
5382 | rdev->saved_raid_disk = -1; | |
41158c7e | 5383 | |
b2d444d7 | 5384 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5385 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5386 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5387 | else |
5388 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5389 | |
1da177e4 LT |
5390 | rdev->raid_disk = -1; |
5391 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5392 | if (!err && !mddev->pers->hot_remove_disk) { |
5393 | /* If there is hot_add_disk but no hot_remove_disk | |
5394 | * then added disks for geometry changes, | |
5395 | * and should be added immediately. | |
5396 | */ | |
5397 | super_types[mddev->major_version]. | |
5398 | validate_super(mddev, rdev); | |
5399 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5400 | if (err) | |
5401 | unbind_rdev_from_array(rdev); | |
5402 | } | |
1da177e4 LT |
5403 | if (err) |
5404 | export_rdev(rdev); | |
52664732 | 5405 | else |
00bcb4ac | 5406 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
c361777f | 5407 | |
17571284 | 5408 | md_update_sb(mddev, 1); |
72a23c21 NB |
5409 | if (mddev->degraded) |
5410 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5411 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
9864c005 | 5412 | if (!err) |
5413 | md_new_event(mddev); | |
005eca5e | 5414 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5415 | return err; |
5416 | } | |
5417 | ||
5418 | /* otherwise, add_new_disk is only allowed | |
5419 | * for major_version==0 superblocks | |
5420 | */ | |
5421 | if (mddev->major_version != 0) { | |
5422 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5423 | mdname(mddev)); | |
5424 | return -EINVAL; | |
5425 | } | |
5426 | ||
5427 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5428 | int err; | |
d710e138 | 5429 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5430 | if (IS_ERR(rdev)) { |
5431 | printk(KERN_WARNING | |
5432 | "md: error, md_import_device() returned %ld\n", | |
5433 | PTR_ERR(rdev)); | |
5434 | return PTR_ERR(rdev); | |
5435 | } | |
5436 | rdev->desc_nr = info->number; | |
5437 | if (info->raid_disk < mddev->raid_disks) | |
5438 | rdev->raid_disk = info->raid_disk; | |
5439 | else | |
5440 | rdev->raid_disk = -1; | |
5441 | ||
1da177e4 | 5442 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5443 | if (info->state & (1<<MD_DISK_SYNC)) |
5444 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5445 | |
8ddf9efe N |
5446 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5447 | set_bit(WriteMostly, &rdev->flags); | |
5448 | ||
1da177e4 LT |
5449 | if (!mddev->persistent) { |
5450 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
77304d2a MS |
5451 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
5452 | } else | |
57b2caa3 | 5453 | rdev->sb_start = calc_dev_sboffset(rdev); |
8190e754 | 5454 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5455 | |
2bf071bf N |
5456 | err = bind_rdev_to_array(rdev, mddev); |
5457 | if (err) { | |
5458 | export_rdev(rdev); | |
5459 | return err; | |
5460 | } | |
1da177e4 LT |
5461 | } |
5462 | ||
5463 | return 0; | |
5464 | } | |
5465 | ||
5466 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5467 | { | |
5468 | char b[BDEVNAME_SIZE]; | |
5469 | mdk_rdev_t *rdev; | |
5470 | ||
1da177e4 LT |
5471 | rdev = find_rdev(mddev, dev); |
5472 | if (!rdev) | |
5473 | return -ENXIO; | |
5474 | ||
5475 | if (rdev->raid_disk >= 0) | |
5476 | goto busy; | |
5477 | ||
5478 | kick_rdev_from_array(rdev); | |
850b2b42 | 5479 | md_update_sb(mddev, 1); |
d7603b7e | 5480 | md_new_event(mddev); |
1da177e4 LT |
5481 | |
5482 | return 0; | |
5483 | busy: | |
fdefa4d8 | 5484 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5485 | bdevname(rdev->bdev,b), mdname(mddev)); |
5486 | return -EBUSY; | |
5487 | } | |
5488 | ||
5489 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5490 | { | |
5491 | char b[BDEVNAME_SIZE]; | |
5492 | int err; | |
1da177e4 LT |
5493 | mdk_rdev_t *rdev; |
5494 | ||
5495 | if (!mddev->pers) | |
5496 | return -ENODEV; | |
5497 | ||
5498 | if (mddev->major_version != 0) { | |
5499 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5500 | " version-0 superblocks.\n", | |
5501 | mdname(mddev)); | |
5502 | return -EINVAL; | |
5503 | } | |
5504 | if (!mddev->pers->hot_add_disk) { | |
5505 | printk(KERN_WARNING | |
5506 | "%s: personality does not support diskops!\n", | |
5507 | mdname(mddev)); | |
5508 | return -EINVAL; | |
5509 | } | |
5510 | ||
d710e138 | 5511 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5512 | if (IS_ERR(rdev)) { |
5513 | printk(KERN_WARNING | |
5514 | "md: error, md_import_device() returned %ld\n", | |
5515 | PTR_ERR(rdev)); | |
5516 | return -EINVAL; | |
5517 | } | |
5518 | ||
5519 | if (mddev->persistent) | |
57b2caa3 | 5520 | rdev->sb_start = calc_dev_sboffset(rdev); |
1da177e4 | 5521 | else |
77304d2a | 5522 | rdev->sb_start = i_size_read(rdev->bdev->bd_inode) / 512; |
1da177e4 | 5523 | |
8190e754 | 5524 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5525 | |
b2d444d7 | 5526 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5527 | printk(KERN_WARNING |
5528 | "md: can not hot-add faulty %s disk to %s!\n", | |
5529 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5530 | err = -EINVAL; | |
5531 | goto abort_export; | |
5532 | } | |
b2d444d7 | 5533 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5534 | rdev->desc_nr = -1; |
5842730d | 5535 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5536 | err = bind_rdev_to_array(rdev, mddev); |
5537 | if (err) | |
5538 | goto abort_export; | |
1da177e4 LT |
5539 | |
5540 | /* | |
5541 | * The rest should better be atomic, we can have disk failures | |
5542 | * noticed in interrupt contexts ... | |
5543 | */ | |
5544 | ||
1da177e4 LT |
5545 | rdev->raid_disk = -1; |
5546 | ||
850b2b42 | 5547 | md_update_sb(mddev, 1); |
1da177e4 LT |
5548 | |
5549 | /* | |
5550 | * Kick recovery, maybe this spare has to be added to the | |
5551 | * array immediately. | |
5552 | */ | |
5553 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5554 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5555 | md_new_event(mddev); |
1da177e4 LT |
5556 | return 0; |
5557 | ||
1da177e4 LT |
5558 | abort_export: |
5559 | export_rdev(rdev); | |
5560 | return err; | |
5561 | } | |
5562 | ||
32a7627c N |
5563 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5564 | { | |
5565 | int err; | |
5566 | ||
36fa3063 N |
5567 | if (mddev->pers) { |
5568 | if (!mddev->pers->quiesce) | |
5569 | return -EBUSY; | |
5570 | if (mddev->recovery || mddev->sync_thread) | |
5571 | return -EBUSY; | |
5572 | /* we should be able to change the bitmap.. */ | |
5573 | } | |
32a7627c | 5574 | |
32a7627c | 5575 | |
36fa3063 N |
5576 | if (fd >= 0) { |
5577 | if (mddev->bitmap) | |
5578 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5579 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5580 | |
c3d9714e | 5581 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5582 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5583 | mdname(mddev)); | |
5584 | return -EBADF; | |
5585 | } | |
5586 | ||
c3d9714e | 5587 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5588 | if (err) { |
5589 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5590 | mdname(mddev)); | |
c3d9714e N |
5591 | fput(mddev->bitmap_info.file); |
5592 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5593 | return err; |
5594 | } | |
c3d9714e | 5595 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5596 | } else if (mddev->bitmap == NULL) |
5597 | return -ENOENT; /* cannot remove what isn't there */ | |
5598 | err = 0; | |
5599 | if (mddev->pers) { | |
5600 | mddev->pers->quiesce(mddev, 1); | |
69e51b44 | 5601 | if (fd >= 0) { |
36fa3063 | 5602 | err = bitmap_create(mddev); |
69e51b44 N |
5603 | if (!err) |
5604 | err = bitmap_load(mddev); | |
5605 | } | |
d7375ab3 | 5606 | if (fd < 0 || err) { |
36fa3063 | 5607 | bitmap_destroy(mddev); |
d7375ab3 N |
5608 | fd = -1; /* make sure to put the file */ |
5609 | } | |
36fa3063 | 5610 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5611 | } |
5612 | if (fd < 0) { | |
c3d9714e N |
5613 | if (mddev->bitmap_info.file) { |
5614 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5615 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5616 | } |
c3d9714e | 5617 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5618 | } |
5619 | ||
32a7627c N |
5620 | return err; |
5621 | } | |
5622 | ||
1da177e4 LT |
5623 | /* |
5624 | * set_array_info is used two different ways | |
5625 | * The original usage is when creating a new array. | |
5626 | * In this usage, raid_disks is > 0 and it together with | |
5627 | * level, size, not_persistent,layout,chunksize determine the | |
5628 | * shape of the array. | |
5629 | * This will always create an array with a type-0.90.0 superblock. | |
5630 | * The newer usage is when assembling an array. | |
5631 | * In this case raid_disks will be 0, and the major_version field is | |
5632 | * use to determine which style super-blocks are to be found on the devices. | |
5633 | * The minor and patch _version numbers are also kept incase the | |
5634 | * super_block handler wishes to interpret them. | |
5635 | */ | |
5636 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5637 | { | |
5638 | ||
5639 | if (info->raid_disks == 0) { | |
5640 | /* just setting version number for superblock loading */ | |
5641 | if (info->major_version < 0 || | |
50511da3 | 5642 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5643 | super_types[info->major_version].name == NULL) { |
5644 | /* maybe try to auto-load a module? */ | |
5645 | printk(KERN_INFO | |
5646 | "md: superblock version %d not known\n", | |
5647 | info->major_version); | |
5648 | return -EINVAL; | |
5649 | } | |
5650 | mddev->major_version = info->major_version; | |
5651 | mddev->minor_version = info->minor_version; | |
5652 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5653 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5654 | /* ensure mddev_put doesn't delete this now that there |
5655 | * is some minimal configuration. | |
5656 | */ | |
5657 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5658 | return 0; |
5659 | } | |
5660 | mddev->major_version = MD_MAJOR_VERSION; | |
5661 | mddev->minor_version = MD_MINOR_VERSION; | |
5662 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5663 | mddev->ctime = get_seconds(); | |
5664 | ||
5665 | mddev->level = info->level; | |
17115e03 | 5666 | mddev->clevel[0] = 0; |
58c0fed4 | 5667 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5668 | mddev->raid_disks = info->raid_disks; |
5669 | /* don't set md_minor, it is determined by which /dev/md* was | |
5670 | * openned | |
5671 | */ | |
5672 | if (info->state & (1<<MD_SB_CLEAN)) | |
5673 | mddev->recovery_cp = MaxSector; | |
5674 | else | |
5675 | mddev->recovery_cp = 0; | |
5676 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5677 | mddev->external = 0; |
1da177e4 LT |
5678 | |
5679 | mddev->layout = info->layout; | |
9d8f0363 | 5680 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5681 | |
5682 | mddev->max_disks = MD_SB_DISKS; | |
5683 | ||
e691063a N |
5684 | if (mddev->persistent) |
5685 | mddev->flags = 0; | |
850b2b42 | 5686 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5687 | |
c3d9714e N |
5688 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5689 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5690 | |
f6705578 N |
5691 | mddev->reshape_position = MaxSector; |
5692 | ||
1da177e4 LT |
5693 | /* |
5694 | * Generate a 128 bit UUID | |
5695 | */ | |
5696 | get_random_bytes(mddev->uuid, 16); | |
5697 | ||
f6705578 | 5698 | mddev->new_level = mddev->level; |
664e7c41 | 5699 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5700 | mddev->new_layout = mddev->layout; |
5701 | mddev->delta_disks = 0; | |
5702 | ||
1da177e4 LT |
5703 | return 0; |
5704 | } | |
5705 | ||
1f403624 DW |
5706 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5707 | { | |
b522adcd DW |
5708 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5709 | ||
5710 | if (mddev->external_size) | |
5711 | return; | |
5712 | ||
1f403624 DW |
5713 | mddev->array_sectors = array_sectors; |
5714 | } | |
5715 | EXPORT_SYMBOL(md_set_array_sectors); | |
5716 | ||
d71f9f88 | 5717 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5718 | { |
159ec1fc | 5719 | mdk_rdev_t *rdev; |
a35b0d69 | 5720 | int rv; |
d71f9f88 | 5721 | int fit = (num_sectors == 0); |
a35b0d69 N |
5722 | |
5723 | if (mddev->pers->resize == NULL) | |
5724 | return -EINVAL; | |
d71f9f88 AN |
5725 | /* The "num_sectors" is the number of sectors of each device that |
5726 | * is used. This can only make sense for arrays with redundancy. | |
5727 | * linear and raid0 always use whatever space is available. We can only | |
5728 | * consider changing this number if no resync or reconstruction is | |
5729 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5730 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5731 | * of each device. If num_sectors is zero, we find the largest size |
5732 | * that fits. | |
a35b0d69 N |
5733 | */ |
5734 | if (mddev->sync_thread) | |
5735 | return -EBUSY; | |
dba034ee N |
5736 | if (mddev->bitmap) |
5737 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5738 | * grow, and re-add. | |
5739 | */ | |
5740 | return -EBUSY; | |
159ec1fc | 5741 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5742 | sector_t avail = rdev->sectors; |
01ab5662 | 5743 | |
d71f9f88 AN |
5744 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5745 | num_sectors = avail; | |
5746 | if (avail < num_sectors) | |
a35b0d69 N |
5747 | return -ENOSPC; |
5748 | } | |
d71f9f88 | 5749 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5750 | if (!rv) |
5751 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5752 | return rv; |
5753 | } | |
5754 | ||
da943b99 N |
5755 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5756 | { | |
5757 | int rv; | |
5758 | /* change the number of raid disks */ | |
63c70c4f | 5759 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5760 | return -EINVAL; |
5761 | if (raid_disks <= 0 || | |
233fca36 | 5762 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5763 | return -EINVAL; |
63c70c4f | 5764 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5765 | return -EBUSY; |
63c70c4f N |
5766 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5767 | ||
5768 | rv = mddev->pers->check_reshape(mddev); | |
de171cb9 N |
5769 | if (rv < 0) |
5770 | mddev->delta_disks = 0; | |
da943b99 N |
5771 | return rv; |
5772 | } | |
5773 | ||
5774 | ||
1da177e4 LT |
5775 | /* |
5776 | * update_array_info is used to change the configuration of an | |
5777 | * on-line array. | |
5778 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5779 | * fields in the info are checked against the array. | |
5780 | * Any differences that cannot be handled will cause an error. | |
5781 | * Normally, only one change can be managed at a time. | |
5782 | */ | |
5783 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5784 | { | |
5785 | int rv = 0; | |
5786 | int cnt = 0; | |
36fa3063 N |
5787 | int state = 0; |
5788 | ||
5789 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5790 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5791 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5792 | |
5793 | if (mddev->major_version != info->major_version || | |
5794 | mddev->minor_version != info->minor_version || | |
5795 | /* mddev->patch_version != info->patch_version || */ | |
5796 | mddev->ctime != info->ctime || | |
5797 | mddev->level != info->level || | |
5798 | /* mddev->layout != info->layout || */ | |
5799 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5800 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5801 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5802 | ((state^info->state) & 0xfffffe00) | |
5803 | ) | |
1da177e4 LT |
5804 | return -EINVAL; |
5805 | /* Check there is only one change */ | |
58c0fed4 AN |
5806 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5807 | cnt++; | |
5808 | if (mddev->raid_disks != info->raid_disks) | |
5809 | cnt++; | |
5810 | if (mddev->layout != info->layout) | |
5811 | cnt++; | |
5812 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5813 | cnt++; | |
5814 | if (cnt == 0) | |
5815 | return 0; | |
5816 | if (cnt > 1) | |
5817 | return -EINVAL; | |
1da177e4 LT |
5818 | |
5819 | if (mddev->layout != info->layout) { | |
5820 | /* Change layout | |
5821 | * we don't need to do anything at the md level, the | |
5822 | * personality will take care of it all. | |
5823 | */ | |
50ac168a | 5824 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5825 | return -EINVAL; |
597a711b N |
5826 | else { |
5827 | mddev->new_layout = info->layout; | |
50ac168a | 5828 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5829 | if (rv) |
5830 | mddev->new_layout = mddev->layout; | |
5831 | return rv; | |
5832 | } | |
1da177e4 | 5833 | } |
58c0fed4 | 5834 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5835 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5836 | |
da943b99 N |
5837 | if (mddev->raid_disks != info->raid_disks) |
5838 | rv = update_raid_disks(mddev, info->raid_disks); | |
5839 | ||
36fa3063 N |
5840 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5841 | if (mddev->pers->quiesce == NULL) | |
5842 | return -EINVAL; | |
5843 | if (mddev->recovery || mddev->sync_thread) | |
5844 | return -EBUSY; | |
5845 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5846 | /* add the bitmap */ | |
5847 | if (mddev->bitmap) | |
5848 | return -EEXIST; | |
c3d9714e | 5849 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5850 | return -EINVAL; |
c3d9714e N |
5851 | mddev->bitmap_info.offset = |
5852 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5853 | mddev->pers->quiesce(mddev, 1); |
5854 | rv = bitmap_create(mddev); | |
69e51b44 N |
5855 | if (!rv) |
5856 | rv = bitmap_load(mddev); | |
36fa3063 N |
5857 | if (rv) |
5858 | bitmap_destroy(mddev); | |
5859 | mddev->pers->quiesce(mddev, 0); | |
5860 | } else { | |
5861 | /* remove the bitmap */ | |
5862 | if (!mddev->bitmap) | |
5863 | return -ENOENT; | |
5864 | if (mddev->bitmap->file) | |
5865 | return -EINVAL; | |
5866 | mddev->pers->quiesce(mddev, 1); | |
5867 | bitmap_destroy(mddev); | |
5868 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5869 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5870 | } |
5871 | } | |
850b2b42 | 5872 | md_update_sb(mddev, 1); |
1da177e4 LT |
5873 | return rv; |
5874 | } | |
5875 | ||
5876 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5877 | { | |
5878 | mdk_rdev_t *rdev; | |
5879 | ||
5880 | if (mddev->pers == NULL) | |
5881 | return -ENODEV; | |
5882 | ||
5883 | rdev = find_rdev(mddev, dev); | |
5884 | if (!rdev) | |
5885 | return -ENODEV; | |
5886 | ||
5887 | md_error(mddev, rdev); | |
5888 | return 0; | |
5889 | } | |
5890 | ||
2f9618ce AN |
5891 | /* |
5892 | * We have a problem here : there is no easy way to give a CHS | |
5893 | * virtual geometry. We currently pretend that we have a 2 heads | |
5894 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5895 | * dosfs just mad... ;-) | |
5896 | */ | |
a885c8c4 CH |
5897 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5898 | { | |
5899 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5900 | ||
5901 | geo->heads = 2; | |
5902 | geo->sectors = 4; | |
49ce6cea | 5903 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
5904 | return 0; |
5905 | } | |
5906 | ||
a39907fa | 5907 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5908 | unsigned int cmd, unsigned long arg) |
5909 | { | |
5910 | int err = 0; | |
5911 | void __user *argp = (void __user *)arg; | |
1da177e4 | 5912 | mddev_t *mddev = NULL; |
e2218350 | 5913 | int ro; |
1da177e4 LT |
5914 | |
5915 | if (!capable(CAP_SYS_ADMIN)) | |
5916 | return -EACCES; | |
5917 | ||
5918 | /* | |
5919 | * Commands dealing with the RAID driver but not any | |
5920 | * particular array: | |
5921 | */ | |
5922 | switch (cmd) | |
5923 | { | |
5924 | case RAID_VERSION: | |
5925 | err = get_version(argp); | |
5926 | goto done; | |
5927 | ||
5928 | case PRINT_RAID_DEBUG: | |
5929 | err = 0; | |
5930 | md_print_devices(); | |
5931 | goto done; | |
5932 | ||
5933 | #ifndef MODULE | |
5934 | case RAID_AUTORUN: | |
5935 | err = 0; | |
5936 | autostart_arrays(arg); | |
5937 | goto done; | |
5938 | #endif | |
5939 | default:; | |
5940 | } | |
5941 | ||
5942 | /* | |
5943 | * Commands creating/starting a new array: | |
5944 | */ | |
5945 | ||
a39907fa | 5946 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5947 | |
5948 | if (!mddev) { | |
5949 | BUG(); | |
5950 | goto abort; | |
5951 | } | |
5952 | ||
1da177e4 LT |
5953 | err = mddev_lock(mddev); |
5954 | if (err) { | |
5955 | printk(KERN_INFO | |
5956 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5957 | err, cmd); | |
5958 | goto abort; | |
5959 | } | |
5960 | ||
5961 | switch (cmd) | |
5962 | { | |
5963 | case SET_ARRAY_INFO: | |
5964 | { | |
5965 | mdu_array_info_t info; | |
5966 | if (!arg) | |
5967 | memset(&info, 0, sizeof(info)); | |
5968 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5969 | err = -EFAULT; | |
5970 | goto abort_unlock; | |
5971 | } | |
5972 | if (mddev->pers) { | |
5973 | err = update_array_info(mddev, &info); | |
5974 | if (err) { | |
5975 | printk(KERN_WARNING "md: couldn't update" | |
5976 | " array info. %d\n", err); | |
5977 | goto abort_unlock; | |
5978 | } | |
5979 | goto done_unlock; | |
5980 | } | |
5981 | if (!list_empty(&mddev->disks)) { | |
5982 | printk(KERN_WARNING | |
5983 | "md: array %s already has disks!\n", | |
5984 | mdname(mddev)); | |
5985 | err = -EBUSY; | |
5986 | goto abort_unlock; | |
5987 | } | |
5988 | if (mddev->raid_disks) { | |
5989 | printk(KERN_WARNING | |
5990 | "md: array %s already initialised!\n", | |
5991 | mdname(mddev)); | |
5992 | err = -EBUSY; | |
5993 | goto abort_unlock; | |
5994 | } | |
5995 | err = set_array_info(mddev, &info); | |
5996 | if (err) { | |
5997 | printk(KERN_WARNING "md: couldn't set" | |
5998 | " array info. %d\n", err); | |
5999 | goto abort_unlock; | |
6000 | } | |
6001 | } | |
6002 | goto done_unlock; | |
6003 | ||
6004 | default:; | |
6005 | } | |
6006 | ||
6007 | /* | |
6008 | * Commands querying/configuring an existing array: | |
6009 | */ | |
32a7627c | 6010 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 6011 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
6012 | if ((!mddev->raid_disks && !mddev->external) |
6013 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
6014 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
6015 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
6016 | err = -ENODEV; |
6017 | goto abort_unlock; | |
6018 | } | |
6019 | ||
6020 | /* | |
6021 | * Commands even a read-only array can execute: | |
6022 | */ | |
6023 | switch (cmd) | |
6024 | { | |
6025 | case GET_ARRAY_INFO: | |
6026 | err = get_array_info(mddev, argp); | |
6027 | goto done_unlock; | |
6028 | ||
32a7627c | 6029 | case GET_BITMAP_FILE: |
87162a28 | 6030 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
6031 | goto done_unlock; |
6032 | ||
1da177e4 LT |
6033 | case GET_DISK_INFO: |
6034 | err = get_disk_info(mddev, argp); | |
6035 | goto done_unlock; | |
6036 | ||
6037 | case RESTART_ARRAY_RW: | |
6038 | err = restart_array(mddev); | |
6039 | goto done_unlock; | |
6040 | ||
6041 | case STOP_ARRAY: | |
d710e138 | 6042 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
6043 | goto done_unlock; |
6044 | ||
6045 | case STOP_ARRAY_RO: | |
a4bd82d0 | 6046 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
6047 | goto done_unlock; |
6048 | ||
e2218350 DW |
6049 | case BLKROSET: |
6050 | if (get_user(ro, (int __user *)(arg))) { | |
6051 | err = -EFAULT; | |
6052 | goto done_unlock; | |
6053 | } | |
6054 | err = -EINVAL; | |
6055 | ||
6056 | /* if the bdev is going readonly the value of mddev->ro | |
6057 | * does not matter, no writes are coming | |
6058 | */ | |
6059 | if (ro) | |
6060 | goto done_unlock; | |
6061 | ||
6062 | /* are we are already prepared for writes? */ | |
6063 | if (mddev->ro != 1) | |
6064 | goto done_unlock; | |
6065 | ||
6066 | /* transitioning to readauto need only happen for | |
6067 | * arrays that call md_write_start | |
6068 | */ | |
6069 | if (mddev->pers) { | |
6070 | err = restart_array(mddev); | |
6071 | if (err == 0) { | |
6072 | mddev->ro = 2; | |
6073 | set_disk_ro(mddev->gendisk, 0); | |
6074 | } | |
6075 | } | |
6076 | goto done_unlock; | |
1da177e4 LT |
6077 | } |
6078 | ||
6079 | /* | |
6080 | * The remaining ioctls are changing the state of the | |
f91de92e N |
6081 | * superblock, so we do not allow them on read-only arrays. |
6082 | * However non-MD ioctls (e.g. get-size) will still come through | |
6083 | * here and hit the 'default' below, so only disallow | |
6084 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 6085 | */ |
bb57fc64 | 6086 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
6087 | if (mddev->ro == 2) { |
6088 | mddev->ro = 0; | |
00bcb4ac | 6089 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
0fd62b86 NB |
6090 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
6091 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
6092 | } else { |
6093 | err = -EROFS; | |
6094 | goto abort_unlock; | |
6095 | } | |
1da177e4 LT |
6096 | } |
6097 | ||
6098 | switch (cmd) | |
6099 | { | |
6100 | case ADD_NEW_DISK: | |
6101 | { | |
6102 | mdu_disk_info_t info; | |
6103 | if (copy_from_user(&info, argp, sizeof(info))) | |
6104 | err = -EFAULT; | |
6105 | else | |
6106 | err = add_new_disk(mddev, &info); | |
6107 | goto done_unlock; | |
6108 | } | |
6109 | ||
6110 | case HOT_REMOVE_DISK: | |
6111 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
6112 | goto done_unlock; | |
6113 | ||
6114 | case HOT_ADD_DISK: | |
6115 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
6116 | goto done_unlock; | |
6117 | ||
6118 | case SET_DISK_FAULTY: | |
6119 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
6120 | goto done_unlock; | |
6121 | ||
6122 | case RUN_ARRAY: | |
d710e138 | 6123 | err = do_md_run(mddev); |
1da177e4 LT |
6124 | goto done_unlock; |
6125 | ||
32a7627c N |
6126 | case SET_BITMAP_FILE: |
6127 | err = set_bitmap_file(mddev, (int)arg); | |
6128 | goto done_unlock; | |
6129 | ||
1da177e4 | 6130 | default: |
1da177e4 LT |
6131 | err = -EINVAL; |
6132 | goto abort_unlock; | |
6133 | } | |
6134 | ||
6135 | done_unlock: | |
6136 | abort_unlock: | |
d3374825 N |
6137 | if (mddev->hold_active == UNTIL_IOCTL && |
6138 | err != -EINVAL) | |
6139 | mddev->hold_active = 0; | |
1da177e4 LT |
6140 | mddev_unlock(mddev); |
6141 | ||
6142 | return err; | |
6143 | done: | |
6144 | if (err) | |
6145 | MD_BUG(); | |
6146 | abort: | |
6147 | return err; | |
6148 | } | |
aa98aa31 AB |
6149 | #ifdef CONFIG_COMPAT |
6150 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
6151 | unsigned int cmd, unsigned long arg) | |
6152 | { | |
6153 | switch (cmd) { | |
6154 | case HOT_REMOVE_DISK: | |
6155 | case HOT_ADD_DISK: | |
6156 | case SET_DISK_FAULTY: | |
6157 | case SET_BITMAP_FILE: | |
6158 | /* These take in integer arg, do not convert */ | |
6159 | break; | |
6160 | default: | |
6161 | arg = (unsigned long)compat_ptr(arg); | |
6162 | break; | |
6163 | } | |
6164 | ||
6165 | return md_ioctl(bdev, mode, cmd, arg); | |
6166 | } | |
6167 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 6168 | |
a39907fa | 6169 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
6170 | { |
6171 | /* | |
6172 | * Succeed if we can lock the mddev, which confirms that | |
6173 | * it isn't being stopped right now. | |
6174 | */ | |
d3374825 | 6175 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
6176 | int err; |
6177 | ||
d3374825 N |
6178 | if (mddev->gendisk != bdev->bd_disk) { |
6179 | /* we are racing with mddev_put which is discarding this | |
6180 | * bd_disk. | |
6181 | */ | |
6182 | mddev_put(mddev); | |
6183 | /* Wait until bdev->bd_disk is definitely gone */ | |
e804ac78 | 6184 | flush_workqueue(md_misc_wq); |
d3374825 N |
6185 | /* Then retry the open from the top */ |
6186 | return -ERESTARTSYS; | |
6187 | } | |
6188 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
6189 | ||
c8c00a69 | 6190 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
6191 | goto out; |
6192 | ||
6193 | err = 0; | |
f2ea68cf | 6194 | atomic_inc(&mddev->openers); |
c8c00a69 | 6195 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 6196 | |
f0b4f7e2 | 6197 | check_disk_change(bdev); |
1da177e4 LT |
6198 | out: |
6199 | return err; | |
6200 | } | |
6201 | ||
a39907fa | 6202 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 6203 | { |
a39907fa | 6204 | mddev_t *mddev = disk->private_data; |
1da177e4 | 6205 | |
52e5f9d1 | 6206 | BUG_ON(!mddev); |
f2ea68cf | 6207 | atomic_dec(&mddev->openers); |
1da177e4 LT |
6208 | mddev_put(mddev); |
6209 | ||
6210 | return 0; | |
6211 | } | |
f0b4f7e2 N |
6212 | |
6213 | static int md_media_changed(struct gendisk *disk) | |
6214 | { | |
6215 | mddev_t *mddev = disk->private_data; | |
6216 | ||
6217 | return mddev->changed; | |
6218 | } | |
6219 | ||
6220 | static int md_revalidate(struct gendisk *disk) | |
6221 | { | |
6222 | mddev_t *mddev = disk->private_data; | |
6223 | ||
6224 | mddev->changed = 0; | |
6225 | return 0; | |
6226 | } | |
83d5cde4 | 6227 | static const struct block_device_operations md_fops = |
1da177e4 LT |
6228 | { |
6229 | .owner = THIS_MODULE, | |
a39907fa AV |
6230 | .open = md_open, |
6231 | .release = md_release, | |
b492b852 | 6232 | .ioctl = md_ioctl, |
aa98aa31 AB |
6233 | #ifdef CONFIG_COMPAT |
6234 | .compat_ioctl = md_compat_ioctl, | |
6235 | #endif | |
a885c8c4 | 6236 | .getgeo = md_getgeo, |
f0b4f7e2 N |
6237 | .media_changed = md_media_changed, |
6238 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
6239 | }; |
6240 | ||
75c96f85 | 6241 | static int md_thread(void * arg) |
1da177e4 LT |
6242 | { |
6243 | mdk_thread_t *thread = arg; | |
6244 | ||
1da177e4 LT |
6245 | /* |
6246 | * md_thread is a 'system-thread', it's priority should be very | |
6247 | * high. We avoid resource deadlocks individually in each | |
6248 | * raid personality. (RAID5 does preallocation) We also use RR and | |
6249 | * the very same RT priority as kswapd, thus we will never get | |
6250 | * into a priority inversion deadlock. | |
6251 | * | |
6252 | * we definitely have to have equal or higher priority than | |
6253 | * bdflush, otherwise bdflush will deadlock if there are too | |
6254 | * many dirty RAID5 blocks. | |
6255 | */ | |
1da177e4 | 6256 | |
6985c43f | 6257 | allow_signal(SIGKILL); |
a6fb0934 | 6258 | while (!kthread_should_stop()) { |
1da177e4 | 6259 | |
93588e22 N |
6260 | /* We need to wait INTERRUPTIBLE so that |
6261 | * we don't add to the load-average. | |
6262 | * That means we need to be sure no signals are | |
6263 | * pending | |
6264 | */ | |
6265 | if (signal_pending(current)) | |
6266 | flush_signals(current); | |
6267 | ||
6268 | wait_event_interruptible_timeout | |
6269 | (thread->wqueue, | |
6270 | test_bit(THREAD_WAKEUP, &thread->flags) | |
6271 | || kthread_should_stop(), | |
6272 | thread->timeout); | |
1da177e4 | 6273 | |
6c987910 N |
6274 | clear_bit(THREAD_WAKEUP, &thread->flags); |
6275 | if (!kthread_should_stop()) | |
589a594b | 6276 | thread->run(thread->mddev); |
1da177e4 | 6277 | } |
a6fb0934 | 6278 | |
1da177e4 LT |
6279 | return 0; |
6280 | } | |
6281 | ||
6282 | void md_wakeup_thread(mdk_thread_t *thread) | |
6283 | { | |
6284 | if (thread) { | |
6285 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
6286 | set_bit(THREAD_WAKEUP, &thread->flags); | |
6287 | wake_up(&thread->wqueue); | |
6288 | } | |
6289 | } | |
6290 | ||
6291 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
6292 | const char *name) | |
6293 | { | |
6294 | mdk_thread_t *thread; | |
1da177e4 | 6295 | |
9ffae0cf | 6296 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
6297 | if (!thread) |
6298 | return NULL; | |
6299 | ||
1da177e4 LT |
6300 | init_waitqueue_head(&thread->wqueue); |
6301 | ||
1da177e4 LT |
6302 | thread->run = run; |
6303 | thread->mddev = mddev; | |
32a7627c | 6304 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6305 | thread->tsk = kthread_run(md_thread, thread, |
6306 | "%s_%s", | |
6307 | mdname(thread->mddev), | |
6308 | name ?: mddev->pers->name); | |
a6fb0934 | 6309 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6310 | kfree(thread); |
6311 | return NULL; | |
6312 | } | |
1da177e4 LT |
6313 | return thread; |
6314 | } | |
6315 | ||
1da177e4 LT |
6316 | void md_unregister_thread(mdk_thread_t *thread) |
6317 | { | |
e0cf8f04 N |
6318 | if (!thread) |
6319 | return; | |
ba25f9dc | 6320 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
6321 | |
6322 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6323 | kfree(thread); |
6324 | } | |
6325 | ||
6326 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
6327 | { | |
6328 | if (!mddev) { | |
6329 | MD_BUG(); | |
6330 | return; | |
6331 | } | |
6332 | ||
b2d444d7 | 6333 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6334 | return; |
6bfe0b49 DW |
6335 | |
6336 | if (mddev->external) | |
6337 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 6338 | /* |
1da177e4 LT |
6339 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
6340 | mdname(mddev), | |
6341 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
6342 | __builtin_return_address(0),__builtin_return_address(1), | |
6343 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 6344 | */ |
d0a0a5ee AM |
6345 | if (!mddev->pers) |
6346 | return; | |
1da177e4 LT |
6347 | if (!mddev->pers->error_handler) |
6348 | return; | |
6349 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6350 | if (mddev->degraded) |
6351 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
00bcb4ac | 6352 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
1da177e4 LT |
6353 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6354 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6355 | md_wakeup_thread(mddev->thread); | |
768a418d | 6356 | if (mddev->event_work.func) |
e804ac78 | 6357 | queue_work(md_misc_wq, &mddev->event_work); |
c331eb04 | 6358 | md_new_event_inintr(mddev); |
1da177e4 LT |
6359 | } |
6360 | ||
6361 | /* seq_file implementation /proc/mdstat */ | |
6362 | ||
6363 | static void status_unused(struct seq_file *seq) | |
6364 | { | |
6365 | int i = 0; | |
6366 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6367 | |
6368 | seq_printf(seq, "unused devices: "); | |
6369 | ||
159ec1fc | 6370 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6371 | char b[BDEVNAME_SIZE]; |
6372 | i++; | |
6373 | seq_printf(seq, "%s ", | |
6374 | bdevname(rdev->bdev,b)); | |
6375 | } | |
6376 | if (!i) | |
6377 | seq_printf(seq, "<none>"); | |
6378 | ||
6379 | seq_printf(seq, "\n"); | |
6380 | } | |
6381 | ||
6382 | ||
6383 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
6384 | { | |
dd71cf6b N |
6385 | sector_t max_sectors, resync, res; |
6386 | unsigned long dt, db; | |
6387 | sector_t rt; | |
4588b42e N |
6388 | int scale; |
6389 | unsigned int per_milli; | |
1da177e4 | 6390 | |
dd71cf6b | 6391 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6392 | |
6393 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6394 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6395 | else |
dd71cf6b | 6396 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6397 | |
6398 | /* | |
6399 | * Should not happen. | |
6400 | */ | |
dd71cf6b | 6401 | if (!max_sectors) { |
1da177e4 LT |
6402 | MD_BUG(); |
6403 | return; | |
6404 | } | |
4588b42e | 6405 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6406 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6407 | * u32, as those are the requirements for sector_div. |
6408 | * Thus 'scale' must be at least 10 | |
6409 | */ | |
6410 | scale = 10; | |
6411 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6412 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6413 | scale++; |
6414 | } | |
6415 | res = (resync>>scale)*1000; | |
dd71cf6b | 6416 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6417 | |
6418 | per_milli = res; | |
1da177e4 | 6419 | { |
4588b42e | 6420 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6421 | seq_printf(seq, "["); |
6422 | for (i = 0; i < x; i++) | |
6423 | seq_printf(seq, "="); | |
6424 | seq_printf(seq, ">"); | |
6425 | for (i = 0; i < y; i++) | |
6426 | seq_printf(seq, "."); | |
6427 | seq_printf(seq, "] "); | |
6428 | } | |
4588b42e | 6429 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6430 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6431 | "reshape" : | |
61df9d91 N |
6432 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6433 | "check" : | |
6434 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6435 | "resync" : "recovery"))), | |
6436 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6437 | (unsigned long long) resync/2, |
6438 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6439 | |
6440 | /* | |
1da177e4 LT |
6441 | * dt: time from mark until now |
6442 | * db: blocks written from mark until now | |
6443 | * rt: remaining time | |
dd71cf6b N |
6444 | * |
6445 | * rt is a sector_t, so could be 32bit or 64bit. | |
6446 | * So we divide before multiply in case it is 32bit and close | |
6447 | * to the limit. | |
25985edc | 6448 | * We scale the divisor (db) by 32 to avoid losing precision |
dd71cf6b N |
6449 | * near the end of resync when the number of remaining sectors |
6450 | * is close to 'db'. | |
6451 | * We then divide rt by 32 after multiplying by db to compensate. | |
6452 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6453 | */ |
6454 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6455 | if (!dt) dt++; | |
ff4e8d9a N |
6456 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6457 | - mddev->resync_mark_cnt; | |
1da177e4 | 6458 | |
dd71cf6b N |
6459 | rt = max_sectors - resync; /* number of remaining sectors */ |
6460 | sector_div(rt, db/32+1); | |
6461 | rt *= dt; | |
6462 | rt >>= 5; | |
6463 | ||
6464 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6465 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6466 | |
ff4e8d9a | 6467 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6468 | } |
6469 | ||
6470 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6471 | { | |
6472 | struct list_head *tmp; | |
6473 | loff_t l = *pos; | |
6474 | mddev_t *mddev; | |
6475 | ||
6476 | if (l >= 0x10000) | |
6477 | return NULL; | |
6478 | if (!l--) | |
6479 | /* header */ | |
6480 | return (void*)1; | |
6481 | ||
6482 | spin_lock(&all_mddevs_lock); | |
6483 | list_for_each(tmp,&all_mddevs) | |
6484 | if (!l--) { | |
6485 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6486 | mddev_get(mddev); | |
6487 | spin_unlock(&all_mddevs_lock); | |
6488 | return mddev; | |
6489 | } | |
6490 | spin_unlock(&all_mddevs_lock); | |
6491 | if (!l--) | |
6492 | return (void*)2;/* tail */ | |
6493 | return NULL; | |
6494 | } | |
6495 | ||
6496 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6497 | { | |
6498 | struct list_head *tmp; | |
6499 | mddev_t *next_mddev, *mddev = v; | |
6500 | ||
6501 | ++*pos; | |
6502 | if (v == (void*)2) | |
6503 | return NULL; | |
6504 | ||
6505 | spin_lock(&all_mddevs_lock); | |
6506 | if (v == (void*)1) | |
6507 | tmp = all_mddevs.next; | |
6508 | else | |
6509 | tmp = mddev->all_mddevs.next; | |
6510 | if (tmp != &all_mddevs) | |
6511 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6512 | else { | |
6513 | next_mddev = (void*)2; | |
6514 | *pos = 0x10000; | |
6515 | } | |
6516 | spin_unlock(&all_mddevs_lock); | |
6517 | ||
6518 | if (v != (void*)1) | |
6519 | mddev_put(mddev); | |
6520 | return next_mddev; | |
6521 | ||
6522 | } | |
6523 | ||
6524 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6525 | { | |
6526 | mddev_t *mddev = v; | |
6527 | ||
6528 | if (mddev && v != (void*)1 && v != (void*)2) | |
6529 | mddev_put(mddev); | |
6530 | } | |
6531 | ||
d7603b7e N |
6532 | struct mdstat_info { |
6533 | int event; | |
6534 | }; | |
6535 | ||
1da177e4 LT |
6536 | static int md_seq_show(struct seq_file *seq, void *v) |
6537 | { | |
6538 | mddev_t *mddev = v; | |
dd8ac336 | 6539 | sector_t sectors; |
1da177e4 | 6540 | mdk_rdev_t *rdev; |
d7603b7e | 6541 | struct mdstat_info *mi = seq->private; |
32a7627c | 6542 | struct bitmap *bitmap; |
1da177e4 LT |
6543 | |
6544 | if (v == (void*)1) { | |
2604b703 | 6545 | struct mdk_personality *pers; |
1da177e4 LT |
6546 | seq_printf(seq, "Personalities : "); |
6547 | spin_lock(&pers_lock); | |
2604b703 N |
6548 | list_for_each_entry(pers, &pers_list, list) |
6549 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6550 | |
6551 | spin_unlock(&pers_lock); | |
6552 | seq_printf(seq, "\n"); | |
d7603b7e | 6553 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6554 | return 0; |
6555 | } | |
6556 | if (v == (void*)2) { | |
6557 | status_unused(seq); | |
6558 | return 0; | |
6559 | } | |
6560 | ||
5dc5cf7d | 6561 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6562 | return -EINTR; |
5dc5cf7d | 6563 | |
1da177e4 LT |
6564 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6565 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6566 | mddev->pers ? "" : "in"); | |
6567 | if (mddev->pers) { | |
f91de92e | 6568 | if (mddev->ro==1) |
1da177e4 | 6569 | seq_printf(seq, " (read-only)"); |
f91de92e | 6570 | if (mddev->ro==2) |
52720ae7 | 6571 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6572 | seq_printf(seq, " %s", mddev->pers->name); |
6573 | } | |
6574 | ||
dd8ac336 | 6575 | sectors = 0; |
159ec1fc | 6576 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6577 | char b[BDEVNAME_SIZE]; |
6578 | seq_printf(seq, " %s[%d]", | |
6579 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6580 | if (test_bit(WriteMostly, &rdev->flags)) |
6581 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6582 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6583 | seq_printf(seq, "(F)"); |
6584 | continue; | |
b325a32e N |
6585 | } else if (rdev->raid_disk < 0) |
6586 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6587 | sectors += rdev->sectors; |
1da177e4 LT |
6588 | } |
6589 | ||
6590 | if (!list_empty(&mddev->disks)) { | |
6591 | if (mddev->pers) | |
6592 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6593 | (unsigned long long) |
6594 | mddev->array_sectors / 2); | |
1da177e4 LT |
6595 | else |
6596 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6597 | (unsigned long long)sectors / 2); |
1da177e4 | 6598 | } |
1cd6bf19 N |
6599 | if (mddev->persistent) { |
6600 | if (mddev->major_version != 0 || | |
6601 | mddev->minor_version != 90) { | |
6602 | seq_printf(seq," super %d.%d", | |
6603 | mddev->major_version, | |
6604 | mddev->minor_version); | |
6605 | } | |
e691063a N |
6606 | } else if (mddev->external) |
6607 | seq_printf(seq, " super external:%s", | |
6608 | mddev->metadata_type); | |
6609 | else | |
1cd6bf19 | 6610 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6611 | |
6612 | if (mddev->pers) { | |
d710e138 | 6613 | mddev->pers->status(seq, mddev); |
1da177e4 | 6614 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6615 | if (mddev->pers->sync_request) { |
6616 | if (mddev->curr_resync > 2) { | |
d710e138 | 6617 | status_resync(seq, mddev); |
8e1b39d6 N |
6618 | seq_printf(seq, "\n "); |
6619 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6620 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6621 | else if (mddev->recovery_cp < MaxSector) | |
6622 | seq_printf(seq, "\tresync=PENDING\n "); | |
6623 | } | |
32a7627c N |
6624 | } else |
6625 | seq_printf(seq, "\n "); | |
6626 | ||
6627 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6628 | unsigned long chunk_kb; |
6629 | unsigned long flags; | |
32a7627c | 6630 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6631 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6632 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6633 | "%lu%s chunk", | |
6634 | bitmap->pages - bitmap->missing_pages, | |
6635 | bitmap->pages, | |
6636 | (bitmap->pages - bitmap->missing_pages) | |
6637 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6638 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6639 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6640 | if (bitmap->file) { |
6641 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6642 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6643 | } |
78d742d8 | 6644 | |
32a7627c N |
6645 | seq_printf(seq, "\n"); |
6646 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6647 | } |
6648 | ||
6649 | seq_printf(seq, "\n"); | |
6650 | } | |
6651 | mddev_unlock(mddev); | |
6652 | ||
6653 | return 0; | |
6654 | } | |
6655 | ||
110518bc | 6656 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6657 | .start = md_seq_start, |
6658 | .next = md_seq_next, | |
6659 | .stop = md_seq_stop, | |
6660 | .show = md_seq_show, | |
6661 | }; | |
6662 | ||
6663 | static int md_seq_open(struct inode *inode, struct file *file) | |
6664 | { | |
6665 | int error; | |
d7603b7e N |
6666 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6667 | if (mi == NULL) | |
6668 | return -ENOMEM; | |
1da177e4 LT |
6669 | |
6670 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6671 | if (error) |
6672 | kfree(mi); | |
6673 | else { | |
6674 | struct seq_file *p = file->private_data; | |
6675 | p->private = mi; | |
6676 | mi->event = atomic_read(&md_event_count); | |
6677 | } | |
1da177e4 LT |
6678 | return error; |
6679 | } | |
6680 | ||
d7603b7e N |
6681 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6682 | { | |
6683 | struct seq_file *m = filp->private_data; | |
6684 | struct mdstat_info *mi = m->private; | |
6685 | int mask; | |
6686 | ||
6687 | poll_wait(filp, &md_event_waiters, wait); | |
6688 | ||
6689 | /* always allow read */ | |
6690 | mask = POLLIN | POLLRDNORM; | |
6691 | ||
6692 | if (mi->event != atomic_read(&md_event_count)) | |
6693 | mask |= POLLERR | POLLPRI; | |
6694 | return mask; | |
6695 | } | |
6696 | ||
fa027c2a | 6697 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6698 | .owner = THIS_MODULE, |
1da177e4 LT |
6699 | .open = md_seq_open, |
6700 | .read = seq_read, | |
6701 | .llseek = seq_lseek, | |
c3f94b40 | 6702 | .release = seq_release_private, |
d7603b7e | 6703 | .poll = mdstat_poll, |
1da177e4 LT |
6704 | }; |
6705 | ||
2604b703 | 6706 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6707 | { |
1da177e4 | 6708 | spin_lock(&pers_lock); |
2604b703 N |
6709 | list_add_tail(&p->list, &pers_list); |
6710 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6711 | spin_unlock(&pers_lock); |
6712 | return 0; | |
6713 | } | |
6714 | ||
2604b703 | 6715 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6716 | { |
2604b703 | 6717 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6718 | spin_lock(&pers_lock); |
2604b703 | 6719 | list_del_init(&p->list); |
1da177e4 LT |
6720 | spin_unlock(&pers_lock); |
6721 | return 0; | |
6722 | } | |
6723 | ||
eea1bf38 | 6724 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6725 | { |
6726 | mdk_rdev_t * rdev; | |
1da177e4 | 6727 | int idle; |
eea1bf38 | 6728 | int curr_events; |
1da177e4 LT |
6729 | |
6730 | idle = 1; | |
4b80991c N |
6731 | rcu_read_lock(); |
6732 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6733 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6734 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6735 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6736 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6737 | /* sync IO will cause sync_io to increase before the disk_stats |
6738 | * as sync_io is counted when a request starts, and | |
6739 | * disk_stats is counted when it completes. | |
6740 | * So resync activity will cause curr_events to be smaller than | |
6741 | * when there was no such activity. | |
6742 | * non-sync IO will cause disk_stat to increase without | |
6743 | * increasing sync_io so curr_events will (eventually) | |
6744 | * be larger than it was before. Once it becomes | |
6745 | * substantially larger, the test below will cause | |
6746 | * the array to appear non-idle, and resync will slow | |
6747 | * down. | |
6748 | * If there is a lot of outstanding resync activity when | |
6749 | * we set last_event to curr_events, then all that activity | |
6750 | * completing might cause the array to appear non-idle | |
6751 | * and resync will be slowed down even though there might | |
6752 | * not have been non-resync activity. This will only | |
6753 | * happen once though. 'last_events' will soon reflect | |
6754 | * the state where there is little or no outstanding | |
6755 | * resync requests, and further resync activity will | |
6756 | * always make curr_events less than last_events. | |
c0e48521 | 6757 | * |
1da177e4 | 6758 | */ |
eea1bf38 | 6759 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6760 | rdev->last_events = curr_events; |
6761 | idle = 0; | |
6762 | } | |
6763 | } | |
4b80991c | 6764 | rcu_read_unlock(); |
1da177e4 LT |
6765 | return idle; |
6766 | } | |
6767 | ||
6768 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6769 | { | |
6770 | /* another "blocks" (512byte) blocks have been synced */ | |
6771 | atomic_sub(blocks, &mddev->recovery_active); | |
6772 | wake_up(&mddev->recovery_wait); | |
6773 | if (!ok) { | |
dfc70645 | 6774 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6775 | md_wakeup_thread(mddev->thread); |
6776 | // stop recovery, signal do_sync .... | |
6777 | } | |
6778 | } | |
6779 | ||
6780 | ||
06d91a5f N |
6781 | /* md_write_start(mddev, bi) |
6782 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6783 | * in superblock) before writing, schedule a superblock update |
6784 | * and wait for it to complete. | |
06d91a5f | 6785 | */ |
3d310eb7 | 6786 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6787 | { |
0fd62b86 | 6788 | int did_change = 0; |
06d91a5f | 6789 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6790 | return; |
06d91a5f | 6791 | |
f91de92e N |
6792 | BUG_ON(mddev->ro == 1); |
6793 | if (mddev->ro == 2) { | |
6794 | /* need to switch to read/write */ | |
6795 | mddev->ro = 0; | |
6796 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6797 | md_wakeup_thread(mddev->thread); | |
25156198 | 6798 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6799 | did_change = 1; |
f91de92e | 6800 | } |
06d91a5f | 6801 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6802 | if (mddev->safemode == 1) |
6803 | mddev->safemode = 0; | |
06d91a5f | 6804 | if (mddev->in_sync) { |
a9701a30 | 6805 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6806 | if (mddev->in_sync) { |
6807 | mddev->in_sync = 0; | |
850b2b42 | 6808 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
070dc6dd | 6809 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
3d310eb7 | 6810 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6811 | did_change = 1; |
3d310eb7 | 6812 | } |
a9701a30 | 6813 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6814 | } |
0fd62b86 | 6815 | if (did_change) |
00bcb4ac | 6816 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
09a44cc1 | 6817 | wait_event(mddev->sb_wait, |
09a44cc1 | 6818 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); |
1da177e4 LT |
6819 | } |
6820 | ||
6821 | void md_write_end(mddev_t *mddev) | |
6822 | { | |
6823 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6824 | if (mddev->safemode == 2) | |
6825 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6826 | else if (mddev->safemode_delay) |
1da177e4 LT |
6827 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6828 | } | |
6829 | } | |
6830 | ||
2a2275d6 N |
6831 | /* md_allow_write(mddev) |
6832 | * Calling this ensures that the array is marked 'active' so that writes | |
6833 | * may proceed without blocking. It is important to call this before | |
6834 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6835 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6836 | * |
6837 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6838 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6839 | */ |
b5470dc5 | 6840 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6841 | { |
6842 | if (!mddev->pers) | |
b5470dc5 | 6843 | return 0; |
2a2275d6 | 6844 | if (mddev->ro) |
b5470dc5 | 6845 | return 0; |
1a0fd497 | 6846 | if (!mddev->pers->sync_request) |
b5470dc5 | 6847 | return 0; |
2a2275d6 N |
6848 | |
6849 | spin_lock_irq(&mddev->write_lock); | |
6850 | if (mddev->in_sync) { | |
6851 | mddev->in_sync = 0; | |
6852 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
070dc6dd | 6853 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2a2275d6 N |
6854 | if (mddev->safemode_delay && |
6855 | mddev->safemode == 0) | |
6856 | mddev->safemode = 1; | |
6857 | spin_unlock_irq(&mddev->write_lock); | |
6858 | md_update_sb(mddev, 0); | |
00bcb4ac | 6859 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
2a2275d6 N |
6860 | } else |
6861 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 | 6862 | |
070dc6dd | 6863 | if (test_bit(MD_CHANGE_PENDING, &mddev->flags)) |
b5470dc5 DW |
6864 | return -EAGAIN; |
6865 | else | |
6866 | return 0; | |
2a2275d6 N |
6867 | } |
6868 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6869 | ||
1da177e4 LT |
6870 | #define SYNC_MARKS 10 |
6871 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6872 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6873 | { |
6874 | mddev_t *mddev2; | |
6875 | unsigned int currspeed = 0, | |
6876 | window; | |
57afd89f | 6877 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6878 | unsigned long mark[SYNC_MARKS]; |
6879 | sector_t mark_cnt[SYNC_MARKS]; | |
6880 | int last_mark,m; | |
6881 | struct list_head *tmp; | |
6882 | sector_t last_check; | |
57afd89f | 6883 | int skipped = 0; |
5fd6c1dc | 6884 | mdk_rdev_t *rdev; |
61df9d91 | 6885 | char *desc; |
1da177e4 LT |
6886 | |
6887 | /* just incase thread restarts... */ | |
6888 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6889 | return; | |
5fd6c1dc N |
6890 | if (mddev->ro) /* never try to sync a read-only array */ |
6891 | return; | |
1da177e4 | 6892 | |
61df9d91 N |
6893 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6894 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6895 | desc = "data-check"; | |
6896 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6897 | desc = "requested-resync"; | |
6898 | else | |
6899 | desc = "resync"; | |
6900 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6901 | desc = "reshape"; | |
6902 | else | |
6903 | desc = "recovery"; | |
6904 | ||
1da177e4 LT |
6905 | /* we overload curr_resync somewhat here. |
6906 | * 0 == not engaged in resync at all | |
6907 | * 2 == checking that there is no conflict with another sync | |
6908 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6909 | * commense | |
6910 | * other == active in resync - this many blocks | |
6911 | * | |
6912 | * Before starting a resync we must have set curr_resync to | |
6913 | * 2, and then checked that every "conflicting" array has curr_resync | |
6914 | * less than ours. When we find one that is the same or higher | |
6915 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6916 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6917 | * This will mean we have to start checking from the beginning again. | |
6918 | * | |
6919 | */ | |
6920 | ||
6921 | do { | |
6922 | mddev->curr_resync = 2; | |
6923 | ||
6924 | try_again: | |
404e4b43 | 6925 | if (kthread_should_stop()) |
6985c43f | 6926 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
6927 | |
6928 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 6929 | goto skip; |
29ac4aa3 | 6930 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6931 | if (mddev2 == mddev) |
6932 | continue; | |
90b08710 BS |
6933 | if (!mddev->parallel_resync |
6934 | && mddev2->curr_resync | |
6935 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6936 | DEFINE_WAIT(wq); |
6937 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6938 | /* arbitrarily yield */ | |
6939 | mddev->curr_resync = 1; | |
6940 | wake_up(&resync_wait); | |
6941 | } | |
6942 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6943 | /* no need to wait here, we can wait the next | |
6944 | * time 'round when curr_resync == 2 | |
6945 | */ | |
6946 | continue; | |
9744197c N |
6947 | /* We need to wait 'interruptible' so as not to |
6948 | * contribute to the load average, and not to | |
6949 | * be caught by 'softlockup' | |
6950 | */ | |
6951 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6952 | if (!kthread_should_stop() && |
8712e553 | 6953 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6954 | printk(KERN_INFO "md: delaying %s of %s" |
6955 | " until %s has finished (they" | |
1da177e4 | 6956 | " share one or more physical units)\n", |
61df9d91 | 6957 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6958 | mddev_put(mddev2); |
9744197c N |
6959 | if (signal_pending(current)) |
6960 | flush_signals(current); | |
1da177e4 LT |
6961 | schedule(); |
6962 | finish_wait(&resync_wait, &wq); | |
6963 | goto try_again; | |
6964 | } | |
6965 | finish_wait(&resync_wait, &wq); | |
6966 | } | |
6967 | } | |
6968 | } while (mddev->curr_resync < 2); | |
6969 | ||
5fd6c1dc | 6970 | j = 0; |
9d88883e | 6971 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6972 | /* resync follows the size requested by the personality, |
57afd89f | 6973 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6974 | */ |
6975 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6976 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6977 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6978 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6979 | j = mddev->resync_min; | |
6980 | else if (!mddev->bitmap) | |
5fd6c1dc | 6981 | j = mddev->recovery_cp; |
5e96ee65 | 6982 | |
ccfcc3c1 | 6983 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6984 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6985 | else { |
1da177e4 | 6986 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6987 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6988 | j = MaxSector; |
4e59ca7d DW |
6989 | rcu_read_lock(); |
6990 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
6991 | if (rdev->raid_disk >= 0 && |
6992 | !test_bit(Faulty, &rdev->flags) && | |
6993 | !test_bit(In_sync, &rdev->flags) && | |
6994 | rdev->recovery_offset < j) | |
6995 | j = rdev->recovery_offset; | |
4e59ca7d | 6996 | rcu_read_unlock(); |
5fd6c1dc | 6997 | } |
1da177e4 | 6998 | |
61df9d91 N |
6999 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
7000 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
7001 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 7002 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
7003 | "(but not more than %d KB/sec) for %s.\n", |
7004 | speed_max(mddev), desc); | |
1da177e4 | 7005 | |
eea1bf38 | 7006 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 7007 | |
57afd89f | 7008 | io_sectors = 0; |
1da177e4 LT |
7009 | for (m = 0; m < SYNC_MARKS; m++) { |
7010 | mark[m] = jiffies; | |
57afd89f | 7011 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
7012 | } |
7013 | last_mark = 0; | |
7014 | mddev->resync_mark = mark[last_mark]; | |
7015 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
7016 | ||
7017 | /* | |
7018 | * Tune reconstruction: | |
7019 | */ | |
7020 | window = 32*(PAGE_SIZE/512); | |
ac42450c JB |
7021 | printk(KERN_INFO "md: using %dk window, over a total of %lluk.\n", |
7022 | window/2, (unsigned long long)max_sectors/2); | |
1da177e4 LT |
7023 | |
7024 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
7025 | last_check = 0; |
7026 | ||
7027 | if (j>2) { | |
7028 | printk(KERN_INFO | |
61df9d91 N |
7029 | "md: resuming %s of %s from checkpoint.\n", |
7030 | desc, mdname(mddev)); | |
1da177e4 LT |
7031 | mddev->curr_resync = j; |
7032 | } | |
75d3da43 | 7033 | mddev->curr_resync_completed = j; |
1da177e4 LT |
7034 | |
7035 | while (j < max_sectors) { | |
57afd89f | 7036 | sector_t sectors; |
1da177e4 | 7037 | |
57afd89f | 7038 | skipped = 0; |
97e4f42d | 7039 | |
7a91ee1f N |
7040 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7041 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
7042 | (mddev->curr_resync - mddev->curr_resync_completed) | |
7043 | > (max_sectors >> 4)) || | |
7044 | (j - mddev->curr_resync_completed)*2 | |
7045 | >= mddev->resync_max - mddev->curr_resync_completed | |
7046 | )) { | |
97e4f42d | 7047 | /* time to update curr_resync_completed */ |
97e4f42d N |
7048 | wait_event(mddev->recovery_wait, |
7049 | atomic_read(&mddev->recovery_active) == 0); | |
75d3da43 | 7050 | mddev->curr_resync_completed = j; |
070dc6dd | 7051 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
acb180b0 | 7052 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 7053 | } |
acb180b0 | 7054 | |
e62e58a5 N |
7055 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
7056 | /* As this condition is controlled by user-space, | |
7057 | * we can block indefinitely, so use '_interruptible' | |
7058 | * to avoid triggering warnings. | |
7059 | */ | |
7060 | flush_signals(current); /* just in case */ | |
7061 | wait_event_interruptible(mddev->recovery_wait, | |
7062 | mddev->resync_max > j | |
7063 | || kthread_should_stop()); | |
7064 | } | |
acb180b0 N |
7065 | |
7066 | if (kthread_should_stop()) | |
7067 | goto interrupted; | |
7068 | ||
57afd89f | 7069 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 7070 | currspeed < speed_min(mddev)); |
57afd89f | 7071 | if (sectors == 0) { |
dfc70645 | 7072 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
7073 | goto out; |
7074 | } | |
57afd89f N |
7075 | |
7076 | if (!skipped) { /* actual IO requested */ | |
7077 | io_sectors += sectors; | |
7078 | atomic_add(sectors, &mddev->recovery_active); | |
7079 | } | |
7080 | ||
1da177e4 LT |
7081 | j += sectors; |
7082 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 7083 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
7084 | if (last_check == 0) |
7085 | /* this is the earliers that rebuilt will be | |
7086 | * visible in /proc/mdstat | |
7087 | */ | |
7088 | md_new_event(mddev); | |
57afd89f N |
7089 | |
7090 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
7091 | continue; |
7092 | ||
57afd89f | 7093 | last_check = io_sectors; |
1da177e4 | 7094 | |
dfc70645 | 7095 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
7096 | break; |
7097 | ||
7098 | repeat: | |
7099 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
7100 | /* step marks */ | |
7101 | int next = (last_mark+1) % SYNC_MARKS; | |
7102 | ||
7103 | mddev->resync_mark = mark[next]; | |
7104 | mddev->resync_mark_cnt = mark_cnt[next]; | |
7105 | mark[next] = jiffies; | |
57afd89f | 7106 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
7107 | last_mark = next; |
7108 | } | |
7109 | ||
7110 | ||
c6207277 N |
7111 | if (kthread_should_stop()) |
7112 | goto interrupted; | |
7113 | ||
1da177e4 LT |
7114 | |
7115 | /* | |
7116 | * this loop exits only if either when we are slower than | |
7117 | * the 'hard' speed limit, or the system was IO-idle for | |
7118 | * a jiffy. | |
7119 | * the system might be non-idle CPU-wise, but we only care | |
7120 | * about not overloading the IO subsystem. (things like an | |
7121 | * e2fsck being done on the RAID array should execute fast) | |
7122 | */ | |
1da177e4 LT |
7123 | cond_resched(); |
7124 | ||
57afd89f N |
7125 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
7126 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 7127 | |
88202a0c N |
7128 | if (currspeed > speed_min(mddev)) { |
7129 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 7130 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 7131 | msleep(500); |
1da177e4 LT |
7132 | goto repeat; |
7133 | } | |
7134 | } | |
7135 | } | |
61df9d91 | 7136 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
7137 | /* |
7138 | * this also signals 'finished resyncing' to md_stop | |
7139 | */ | |
7140 | out: | |
1da177e4 LT |
7141 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); |
7142 | ||
7143 | /* tell personality that we are finished */ | |
57afd89f | 7144 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 7145 | |
dfc70645 | 7146 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
7147 | mddev->curr_resync > 2) { |
7148 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
7149 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
7150 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
7151 | printk(KERN_INFO | |
61df9d91 N |
7152 | "md: checkpointing %s of %s.\n", |
7153 | desc, mdname(mddev)); | |
5fd6c1dc N |
7154 | mddev->recovery_cp = mddev->curr_resync; |
7155 | } | |
7156 | } else | |
7157 | mddev->recovery_cp = MaxSector; | |
7158 | } else { | |
7159 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
7160 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
7161 | rcu_read_lock(); |
7162 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 7163 | if (rdev->raid_disk >= 0 && |
70fffd0b | 7164 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
7165 | !test_bit(Faulty, &rdev->flags) && |
7166 | !test_bit(In_sync, &rdev->flags) && | |
7167 | rdev->recovery_offset < mddev->curr_resync) | |
7168 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 7169 | rcu_read_unlock(); |
5fd6c1dc | 7170 | } |
1da177e4 | 7171 | } |
17571284 | 7172 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 7173 | |
1da177e4 | 7174 | skip: |
c07b70ad N |
7175 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
7176 | /* We completed so min/max setting can be forgotten if used. */ | |
7177 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7178 | mddev->resync_min = 0; | |
7179 | mddev->resync_max = MaxSector; | |
7180 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
7181 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 LT |
7182 | mddev->curr_resync = 0; |
7183 | wake_up(&resync_wait); | |
7184 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
7185 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
7186 | return; |
7187 | ||
7188 | interrupted: | |
7189 | /* | |
7190 | * got a signal, exit. | |
7191 | */ | |
7192 | printk(KERN_INFO | |
7193 | "md: md_do_sync() got signal ... exiting\n"); | |
7194 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
7195 | goto out; | |
7196 | ||
1da177e4 | 7197 | } |
29269553 | 7198 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 | 7199 | |
b4c4c7b8 N |
7200 | static int remove_and_add_spares(mddev_t *mddev) |
7201 | { | |
7202 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
7203 | int spares = 0; |
7204 | ||
97e4f42d N |
7205 | mddev->curr_resync_completed = 0; |
7206 | ||
159ec1fc | 7207 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 7208 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 7209 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
7210 | (test_bit(Faulty, &rdev->flags) || |
7211 | ! test_bit(In_sync, &rdev->flags)) && | |
7212 | atomic_read(&rdev->nr_pending)==0) { | |
7213 | if (mddev->pers->hot_remove_disk( | |
7214 | mddev, rdev->raid_disk)==0) { | |
36fad858 | 7215 | sysfs_unlink_rdev(mddev, rdev); |
b4c4c7b8 N |
7216 | rdev->raid_disk = -1; |
7217 | } | |
7218 | } | |
7219 | ||
5389042f | 7220 | if (mddev->degraded) { |
159ec1fc | 7221 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 7222 | if (rdev->raid_disk >= 0 && |
e5427135 | 7223 | !test_bit(In_sync, &rdev->flags) && |
4274215d | 7224 | !test_bit(Faulty, &rdev->flags) && |
e5427135 | 7225 | !test_bit(Blocked, &rdev->flags)) |
dfc70645 | 7226 | spares++; |
b4c4c7b8 N |
7227 | if (rdev->raid_disk < 0 |
7228 | && !test_bit(Faulty, &rdev->flags)) { | |
7229 | rdev->recovery_offset = 0; | |
199050ea NB |
7230 | if (mddev->pers-> |
7231 | hot_add_disk(mddev, rdev) == 0) { | |
36fad858 | 7232 | if (sysfs_link_rdev(mddev, rdev)) |
00bcb4ac | 7233 | /* failure here is OK */; |
b4c4c7b8 N |
7234 | spares++; |
7235 | md_new_event(mddev); | |
93be75ff | 7236 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
7237 | } else |
7238 | break; | |
7239 | } | |
dfc70645 | 7240 | } |
b4c4c7b8 N |
7241 | } |
7242 | return spares; | |
7243 | } | |
7ebc0be7 N |
7244 | |
7245 | static void reap_sync_thread(mddev_t *mddev) | |
7246 | { | |
7247 | mdk_rdev_t *rdev; | |
7248 | ||
7249 | /* resync has finished, collect result */ | |
7250 | md_unregister_thread(mddev->sync_thread); | |
7251 | mddev->sync_thread = NULL; | |
7252 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && | |
7253 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
7254 | /* success...*/ | |
7255 | /* activate any spares */ | |
7256 | if (mddev->pers->spare_active(mddev)) | |
7257 | sysfs_notify(&mddev->kobj, NULL, | |
7258 | "degraded"); | |
7259 | } | |
7260 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && | |
7261 | mddev->pers->finish_reshape) | |
7262 | mddev->pers->finish_reshape(mddev); | |
7263 | md_update_sb(mddev, 1); | |
7264 | ||
7265 | /* if array is no-longer degraded, then any saved_raid_disk | |
7266 | * information must be scrapped | |
7267 | */ | |
7268 | if (!mddev->degraded) | |
7269 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
7270 | rdev->saved_raid_disk = -1; | |
7271 | ||
7272 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7273 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7274 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7275 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7276 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
7277 | /* flag recovery needed just to double check */ | |
7278 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7279 | sysfs_notify_dirent_safe(mddev->sysfs_action); | |
7280 | md_new_event(mddev); | |
768e587e JB |
7281 | if (mddev->event_work.func) |
7282 | queue_work(md_misc_wq, &mddev->event_work); | |
7ebc0be7 N |
7283 | } |
7284 | ||
1da177e4 LT |
7285 | /* |
7286 | * This routine is regularly called by all per-raid-array threads to | |
7287 | * deal with generic issues like resync and super-block update. | |
7288 | * Raid personalities that don't have a thread (linear/raid0) do not | |
7289 | * need this as they never do any recovery or update the superblock. | |
7290 | * | |
7291 | * It does not do any resync itself, but rather "forks" off other threads | |
7292 | * to do that as needed. | |
7293 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
7294 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 7295 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
7296 | * and wakeups up this thread which will reap the thread and finish up. |
7297 | * This thread also removes any faulty devices (with nr_pending == 0). | |
7298 | * | |
7299 | * The overall approach is: | |
7300 | * 1/ if the superblock needs updating, update it. | |
7301 | * 2/ If a recovery thread is running, don't do anything else. | |
7302 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
7303 | * 4/ If there are any faulty devices, remove them. | |
7304 | * 5/ If array is degraded, try to add spares devices | |
7305 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
7306 | */ | |
7307 | void md_check_recovery(mddev_t *mddev) | |
7308 | { | |
68866e42 JB |
7309 | if (mddev->suspended) |
7310 | return; | |
7311 | ||
5f40402d | 7312 | if (mddev->bitmap) |
aa5cbd10 | 7313 | bitmap_daemon_work(mddev); |
1da177e4 | 7314 | |
fca4d848 | 7315 | if (signal_pending(current)) { |
31a59e34 | 7316 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7317 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7318 | mdname(mddev)); | |
7319 | mddev->safemode = 2; | |
7320 | } | |
7321 | flush_signals(current); | |
7322 | } | |
7323 | ||
c89a8eee N |
7324 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7325 | return; | |
1da177e4 | 7326 | if ( ! ( |
126925c0 | 7327 | (mddev->flags & ~ (1<<MD_CHANGE_PENDING)) || |
1da177e4 | 7328 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7329 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7330 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7331 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7332 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7333 | )) |
7334 | return; | |
fca4d848 | 7335 | |
df5b89b3 | 7336 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7337 | int spares = 0; |
fca4d848 | 7338 | |
c89a8eee N |
7339 | if (mddev->ro) { |
7340 | /* Only thing we do on a ro array is remove | |
7341 | * failed devices. | |
7342 | */ | |
a8c42c7f N |
7343 | mdk_rdev_t *rdev; |
7344 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
7345 | if (rdev->raid_disk >= 0 && | |
7346 | !test_bit(Blocked, &rdev->flags) && | |
7347 | test_bit(Faulty, &rdev->flags) && | |
7348 | atomic_read(&rdev->nr_pending)==0) { | |
7349 | if (mddev->pers->hot_remove_disk( | |
7350 | mddev, rdev->raid_disk)==0) { | |
36fad858 | 7351 | sysfs_unlink_rdev(mddev, rdev); |
a8c42c7f N |
7352 | rdev->raid_disk = -1; |
7353 | } | |
7354 | } | |
c89a8eee N |
7355 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
7356 | goto unlock; | |
7357 | } | |
7358 | ||
31a59e34 | 7359 | if (!mddev->external) { |
0fd62b86 | 7360 | int did_change = 0; |
31a59e34 N |
7361 | spin_lock_irq(&mddev->write_lock); |
7362 | if (mddev->safemode && | |
7363 | !atomic_read(&mddev->writes_pending) && | |
7364 | !mddev->in_sync && | |
7365 | mddev->recovery_cp == MaxSector) { | |
7366 | mddev->in_sync = 1; | |
0fd62b86 | 7367 | did_change = 1; |
070dc6dd | 7368 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
31a59e34 N |
7369 | } |
7370 | if (mddev->safemode == 1) | |
7371 | mddev->safemode = 0; | |
7372 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7373 | if (did_change) |
00bcb4ac | 7374 | sysfs_notify_dirent_safe(mddev->sysfs_state); |
fca4d848 | 7375 | } |
fca4d848 | 7376 | |
850b2b42 N |
7377 | if (mddev->flags) |
7378 | md_update_sb(mddev, 0); | |
06d91a5f | 7379 | |
1da177e4 LT |
7380 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7381 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7382 | /* resync/recovery still happening */ | |
7383 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7384 | goto unlock; | |
7385 | } | |
7386 | if (mddev->sync_thread) { | |
7ebc0be7 | 7387 | reap_sync_thread(mddev); |
1da177e4 LT |
7388 | goto unlock; |
7389 | } | |
72a23c21 NB |
7390 | /* Set RUNNING before clearing NEEDED to avoid |
7391 | * any transients in the value of "sync_action". | |
7392 | */ | |
7393 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7394 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7395 | /* Clear some bits that don't mean anything, but |
7396 | * might be left set | |
7397 | */ | |
24dd469d N |
7398 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7399 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7400 | |
5fd6c1dc N |
7401 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7402 | goto unlock; | |
1da177e4 LT |
7403 | /* no recovery is running. |
7404 | * remove any failed drives, then | |
7405 | * add spares if possible. | |
7406 | * Spare are also removed and re-added, to allow | |
7407 | * the personality to fail the re-add. | |
7408 | */ | |
1da177e4 | 7409 | |
b4c4c7b8 | 7410 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7411 | if (mddev->pers->check_reshape == NULL || |
7412 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7413 | /* Cannot proceed */ |
7414 | goto unlock; | |
7415 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7416 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7417 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7418 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7419 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7420 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7421 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7422 | } else if (mddev->recovery_cp < MaxSector) { |
7423 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7424 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7425 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7426 | /* nothing to be done ... */ | |
1da177e4 | 7427 | goto unlock; |
24dd469d | 7428 | |
1da177e4 | 7429 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7430 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7431 | /* We are adding a device or devices to an array | |
7432 | * which has the bitmap stored on all devices. | |
7433 | * So make sure all bitmap pages get written | |
7434 | */ | |
7435 | bitmap_write_all(mddev->bitmap); | |
7436 | } | |
1da177e4 LT |
7437 | mddev->sync_thread = md_register_thread(md_do_sync, |
7438 | mddev, | |
0da3c619 | 7439 | "resync"); |
1da177e4 LT |
7440 | if (!mddev->sync_thread) { |
7441 | printk(KERN_ERR "%s: could not start resync" | |
7442 | " thread...\n", | |
7443 | mdname(mddev)); | |
7444 | /* leave the spares where they are, it shouldn't hurt */ | |
7ebc0be7 N |
7445 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); |
7446 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7447 | clear_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
7448 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
7449 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
d7603b7e | 7450 | } else |
1da177e4 | 7451 | md_wakeup_thread(mddev->sync_thread); |
00bcb4ac | 7452 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
d7603b7e | 7453 | md_new_event(mddev); |
1da177e4 LT |
7454 | } |
7455 | unlock: | |
72a23c21 NB |
7456 | if (!mddev->sync_thread) { |
7457 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7458 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7459 | &mddev->recovery)) | |
0c3573f1 | 7460 | if (mddev->sysfs_action) |
00bcb4ac | 7461 | sysfs_notify_dirent_safe(mddev->sysfs_action); |
72a23c21 | 7462 | } |
1da177e4 LT |
7463 | mddev_unlock(mddev); |
7464 | } | |
7465 | } | |
7466 | ||
6bfe0b49 DW |
7467 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
7468 | { | |
00bcb4ac | 7469 | sysfs_notify_dirent_safe(rdev->sysfs_state); |
6bfe0b49 DW |
7470 | wait_event_timeout(rdev->blocked_wait, |
7471 | !test_bit(Blocked, &rdev->flags), | |
7472 | msecs_to_jiffies(5000)); | |
7473 | rdev_dec_pending(rdev, mddev); | |
7474 | } | |
7475 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7476 | ||
2230dfe4 N |
7477 | |
7478 | /* Bad block management. | |
7479 | * We can record which blocks on each device are 'bad' and so just | |
7480 | * fail those blocks, or that stripe, rather than the whole device. | |
7481 | * Entries in the bad-block table are 64bits wide. This comprises: | |
7482 | * Length of bad-range, in sectors: 0-511 for lengths 1-512 | |
7483 | * Start of bad-range, sector offset, 54 bits (allows 8 exbibytes) | |
7484 | * A 'shift' can be set so that larger blocks are tracked and | |
7485 | * consequently larger devices can be covered. | |
7486 | * 'Acknowledged' flag - 1 bit. - the most significant bit. | |
7487 | * | |
7488 | * Locking of the bad-block table uses a seqlock so md_is_badblock | |
7489 | * might need to retry if it is very unlucky. | |
7490 | * We will sometimes want to check for bad blocks in a bi_end_io function, | |
7491 | * so we use the write_seqlock_irq variant. | |
7492 | * | |
7493 | * When looking for a bad block we specify a range and want to | |
7494 | * know if any block in the range is bad. So we binary-search | |
7495 | * to the last range that starts at-or-before the given endpoint, | |
7496 | * (or "before the sector after the target range") | |
7497 | * then see if it ends after the given start. | |
7498 | * We return | |
7499 | * 0 if there are no known bad blocks in the range | |
7500 | * 1 if there are known bad block which are all acknowledged | |
7501 | * -1 if there are bad blocks which have not yet been acknowledged in metadata. | |
7502 | * plus the start/length of the first bad section we overlap. | |
7503 | */ | |
7504 | int md_is_badblock(struct badblocks *bb, sector_t s, int sectors, | |
7505 | sector_t *first_bad, int *bad_sectors) | |
7506 | { | |
7507 | int hi; | |
7508 | int lo = 0; | |
7509 | u64 *p = bb->page; | |
7510 | int rv = 0; | |
7511 | sector_t target = s + sectors; | |
7512 | unsigned seq; | |
7513 | ||
7514 | if (bb->shift > 0) { | |
7515 | /* round the start down, and the end up */ | |
7516 | s >>= bb->shift; | |
7517 | target += (1<<bb->shift) - 1; | |
7518 | target >>= bb->shift; | |
7519 | sectors = target - s; | |
7520 | } | |
7521 | /* 'target' is now the first block after the bad range */ | |
7522 | ||
7523 | retry: | |
7524 | seq = read_seqbegin(&bb->lock); | |
7525 | ||
7526 | hi = bb->count; | |
7527 | ||
7528 | /* Binary search between lo and hi for 'target' | |
7529 | * i.e. for the last range that starts before 'target' | |
7530 | */ | |
7531 | /* INVARIANT: ranges before 'lo' and at-or-after 'hi' | |
7532 | * are known not to be the last range before target. | |
7533 | * VARIANT: hi-lo is the number of possible | |
7534 | * ranges, and decreases until it reaches 1 | |
7535 | */ | |
7536 | while (hi - lo > 1) { | |
7537 | int mid = (lo + hi) / 2; | |
7538 | sector_t a = BB_OFFSET(p[mid]); | |
7539 | if (a < target) | |
7540 | /* This could still be the one, earlier ranges | |
7541 | * could not. */ | |
7542 | lo = mid; | |
7543 | else | |
7544 | /* This and later ranges are definitely out. */ | |
7545 | hi = mid; | |
7546 | } | |
7547 | /* 'lo' might be the last that started before target, but 'hi' isn't */ | |
7548 | if (hi > lo) { | |
7549 | /* need to check all range that end after 's' to see if | |
7550 | * any are unacknowledged. | |
7551 | */ | |
7552 | while (lo >= 0 && | |
7553 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7554 | if (BB_OFFSET(p[lo]) < target) { | |
7555 | /* starts before the end, and finishes after | |
7556 | * the start, so they must overlap | |
7557 | */ | |
7558 | if (rv != -1 && BB_ACK(p[lo])) | |
7559 | rv = 1; | |
7560 | else | |
7561 | rv = -1; | |
7562 | *first_bad = BB_OFFSET(p[lo]); | |
7563 | *bad_sectors = BB_LEN(p[lo]); | |
7564 | } | |
7565 | lo--; | |
7566 | } | |
7567 | } | |
7568 | ||
7569 | if (read_seqretry(&bb->lock, seq)) | |
7570 | goto retry; | |
7571 | ||
7572 | return rv; | |
7573 | } | |
7574 | EXPORT_SYMBOL_GPL(md_is_badblock); | |
7575 | ||
7576 | /* | |
7577 | * Add a range of bad blocks to the table. | |
7578 | * This might extend the table, or might contract it | |
7579 | * if two adjacent ranges can be merged. | |
7580 | * We binary-search to find the 'insertion' point, then | |
7581 | * decide how best to handle it. | |
7582 | */ | |
7583 | static int md_set_badblocks(struct badblocks *bb, sector_t s, int sectors, | |
7584 | int acknowledged) | |
7585 | { | |
7586 | u64 *p; | |
7587 | int lo, hi; | |
7588 | int rv = 1; | |
7589 | ||
7590 | if (bb->shift < 0) | |
7591 | /* badblocks are disabled */ | |
7592 | return 0; | |
7593 | ||
7594 | if (bb->shift) { | |
7595 | /* round the start down, and the end up */ | |
7596 | sector_t next = s + sectors; | |
7597 | s >>= bb->shift; | |
7598 | next += (1<<bb->shift) - 1; | |
7599 | next >>= bb->shift; | |
7600 | sectors = next - s; | |
7601 | } | |
7602 | ||
7603 | write_seqlock_irq(&bb->lock); | |
7604 | ||
7605 | p = bb->page; | |
7606 | lo = 0; | |
7607 | hi = bb->count; | |
7608 | /* Find the last range that starts at-or-before 's' */ | |
7609 | while (hi - lo > 1) { | |
7610 | int mid = (lo + hi) / 2; | |
7611 | sector_t a = BB_OFFSET(p[mid]); | |
7612 | if (a <= s) | |
7613 | lo = mid; | |
7614 | else | |
7615 | hi = mid; | |
7616 | } | |
7617 | if (hi > lo && BB_OFFSET(p[lo]) > s) | |
7618 | hi = lo; | |
7619 | ||
7620 | if (hi > lo) { | |
7621 | /* we found a range that might merge with the start | |
7622 | * of our new range | |
7623 | */ | |
7624 | sector_t a = BB_OFFSET(p[lo]); | |
7625 | sector_t e = a + BB_LEN(p[lo]); | |
7626 | int ack = BB_ACK(p[lo]); | |
7627 | if (e >= s) { | |
7628 | /* Yes, we can merge with a previous range */ | |
7629 | if (s == a && s + sectors >= e) | |
7630 | /* new range covers old */ | |
7631 | ack = acknowledged; | |
7632 | else | |
7633 | ack = ack && acknowledged; | |
7634 | ||
7635 | if (e < s + sectors) | |
7636 | e = s + sectors; | |
7637 | if (e - a <= BB_MAX_LEN) { | |
7638 | p[lo] = BB_MAKE(a, e-a, ack); | |
7639 | s = e; | |
7640 | } else { | |
7641 | /* does not all fit in one range, | |
7642 | * make p[lo] maximal | |
7643 | */ | |
7644 | if (BB_LEN(p[lo]) != BB_MAX_LEN) | |
7645 | p[lo] = BB_MAKE(a, BB_MAX_LEN, ack); | |
7646 | s = a + BB_MAX_LEN; | |
7647 | } | |
7648 | sectors = e - s; | |
7649 | } | |
7650 | } | |
7651 | if (sectors && hi < bb->count) { | |
7652 | /* 'hi' points to the first range that starts after 's'. | |
7653 | * Maybe we can merge with the start of that range */ | |
7654 | sector_t a = BB_OFFSET(p[hi]); | |
7655 | sector_t e = a + BB_LEN(p[hi]); | |
7656 | int ack = BB_ACK(p[hi]); | |
7657 | if (a <= s + sectors) { | |
7658 | /* merging is possible */ | |
7659 | if (e <= s + sectors) { | |
7660 | /* full overlap */ | |
7661 | e = s + sectors; | |
7662 | ack = acknowledged; | |
7663 | } else | |
7664 | ack = ack && acknowledged; | |
7665 | ||
7666 | a = s; | |
7667 | if (e - a <= BB_MAX_LEN) { | |
7668 | p[hi] = BB_MAKE(a, e-a, ack); | |
7669 | s = e; | |
7670 | } else { | |
7671 | p[hi] = BB_MAKE(a, BB_MAX_LEN, ack); | |
7672 | s = a + BB_MAX_LEN; | |
7673 | } | |
7674 | sectors = e - s; | |
7675 | lo = hi; | |
7676 | hi++; | |
7677 | } | |
7678 | } | |
7679 | if (sectors == 0 && hi < bb->count) { | |
7680 | /* we might be able to combine lo and hi */ | |
7681 | /* Note: 's' is at the end of 'lo' */ | |
7682 | sector_t a = BB_OFFSET(p[hi]); | |
7683 | int lolen = BB_LEN(p[lo]); | |
7684 | int hilen = BB_LEN(p[hi]); | |
7685 | int newlen = lolen + hilen - (s - a); | |
7686 | if (s >= a && newlen < BB_MAX_LEN) { | |
7687 | /* yes, we can combine them */ | |
7688 | int ack = BB_ACK(p[lo]) && BB_ACK(p[hi]); | |
7689 | p[lo] = BB_MAKE(BB_OFFSET(p[lo]), newlen, ack); | |
7690 | memmove(p + hi, p + hi + 1, | |
7691 | (bb->count - hi - 1) * 8); | |
7692 | bb->count--; | |
7693 | } | |
7694 | } | |
7695 | while (sectors) { | |
7696 | /* didn't merge (it all). | |
7697 | * Need to add a range just before 'hi' */ | |
7698 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
7699 | /* No room for more */ | |
7700 | rv = 0; | |
7701 | break; | |
7702 | } else { | |
7703 | int this_sectors = sectors; | |
7704 | memmove(p + hi + 1, p + hi, | |
7705 | (bb->count - hi) * 8); | |
7706 | bb->count++; | |
7707 | ||
7708 | if (this_sectors > BB_MAX_LEN) | |
7709 | this_sectors = BB_MAX_LEN; | |
7710 | p[hi] = BB_MAKE(s, this_sectors, acknowledged); | |
7711 | sectors -= this_sectors; | |
7712 | s += this_sectors; | |
7713 | } | |
7714 | } | |
7715 | ||
7716 | bb->changed = 1; | |
7717 | write_sequnlock_irq(&bb->lock); | |
7718 | ||
7719 | return rv; | |
7720 | } | |
7721 | ||
7722 | int rdev_set_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors, | |
7723 | int acknowledged) | |
7724 | { | |
7725 | int rv = md_set_badblocks(&rdev->badblocks, | |
7726 | s + rdev->data_offset, sectors, acknowledged); | |
7727 | if (rv) { | |
7728 | /* Make sure they get written out promptly */ | |
7729 | set_bit(MD_CHANGE_CLEAN, &rdev->mddev->flags); | |
7730 | md_wakeup_thread(rdev->mddev->thread); | |
7731 | } | |
7732 | return rv; | |
7733 | } | |
7734 | EXPORT_SYMBOL_GPL(rdev_set_badblocks); | |
7735 | ||
7736 | /* | |
7737 | * Remove a range of bad blocks from the table. | |
7738 | * This may involve extending the table if we spilt a region, | |
7739 | * but it must not fail. So if the table becomes full, we just | |
7740 | * drop the remove request. | |
7741 | */ | |
7742 | static int md_clear_badblocks(struct badblocks *bb, sector_t s, int sectors) | |
7743 | { | |
7744 | u64 *p; | |
7745 | int lo, hi; | |
7746 | sector_t target = s + sectors; | |
7747 | int rv = 0; | |
7748 | ||
7749 | if (bb->shift > 0) { | |
7750 | /* When clearing we round the start up and the end down. | |
7751 | * This should not matter as the shift should align with | |
7752 | * the block size and no rounding should ever be needed. | |
7753 | * However it is better the think a block is bad when it | |
7754 | * isn't than to think a block is not bad when it is. | |
7755 | */ | |
7756 | s += (1<<bb->shift) - 1; | |
7757 | s >>= bb->shift; | |
7758 | target >>= bb->shift; | |
7759 | sectors = target - s; | |
7760 | } | |
7761 | ||
7762 | write_seqlock_irq(&bb->lock); | |
7763 | ||
7764 | p = bb->page; | |
7765 | lo = 0; | |
7766 | hi = bb->count; | |
7767 | /* Find the last range that starts before 'target' */ | |
7768 | while (hi - lo > 1) { | |
7769 | int mid = (lo + hi) / 2; | |
7770 | sector_t a = BB_OFFSET(p[mid]); | |
7771 | if (a < target) | |
7772 | lo = mid; | |
7773 | else | |
7774 | hi = mid; | |
7775 | } | |
7776 | if (hi > lo) { | |
7777 | /* p[lo] is the last range that could overlap the | |
7778 | * current range. Earlier ranges could also overlap, | |
7779 | * but only this one can overlap the end of the range. | |
7780 | */ | |
7781 | if (BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > target) { | |
7782 | /* Partial overlap, leave the tail of this range */ | |
7783 | int ack = BB_ACK(p[lo]); | |
7784 | sector_t a = BB_OFFSET(p[lo]); | |
7785 | sector_t end = a + BB_LEN(p[lo]); | |
7786 | ||
7787 | if (a < s) { | |
7788 | /* we need to split this range */ | |
7789 | if (bb->count >= MD_MAX_BADBLOCKS) { | |
7790 | rv = 0; | |
7791 | goto out; | |
7792 | } | |
7793 | memmove(p+lo+1, p+lo, (bb->count - lo) * 8); | |
7794 | bb->count++; | |
7795 | p[lo] = BB_MAKE(a, s-a, ack); | |
7796 | lo++; | |
7797 | } | |
7798 | p[lo] = BB_MAKE(target, end - target, ack); | |
7799 | /* there is no longer an overlap */ | |
7800 | hi = lo; | |
7801 | lo--; | |
7802 | } | |
7803 | while (lo >= 0 && | |
7804 | BB_OFFSET(p[lo]) + BB_LEN(p[lo]) > s) { | |
7805 | /* This range does overlap */ | |
7806 | if (BB_OFFSET(p[lo]) < s) { | |
7807 | /* Keep the early parts of this range. */ | |
7808 | int ack = BB_ACK(p[lo]); | |
7809 | sector_t start = BB_OFFSET(p[lo]); | |
7810 | p[lo] = BB_MAKE(start, s - start, ack); | |
7811 | /* now low doesn't overlap, so.. */ | |
7812 | break; | |
7813 | } | |
7814 | lo--; | |
7815 | } | |
7816 | /* 'lo' is strictly before, 'hi' is strictly after, | |
7817 | * anything between needs to be discarded | |
7818 | */ | |
7819 | if (hi - lo > 1) { | |
7820 | memmove(p+lo+1, p+hi, (bb->count - hi) * 8); | |
7821 | bb->count -= (hi - lo - 1); | |
7822 | } | |
7823 | } | |
7824 | ||
7825 | bb->changed = 1; | |
7826 | out: | |
7827 | write_sequnlock_irq(&bb->lock); | |
7828 | return rv; | |
7829 | } | |
7830 | ||
7831 | int rdev_clear_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors) | |
7832 | { | |
7833 | return md_clear_badblocks(&rdev->badblocks, | |
7834 | s + rdev->data_offset, | |
7835 | sectors); | |
7836 | } | |
7837 | EXPORT_SYMBOL_GPL(rdev_clear_badblocks); | |
7838 | ||
7839 | /* | |
7840 | * Acknowledge all bad blocks in a list. | |
7841 | * This only succeeds if ->changed is clear. It is used by | |
7842 | * in-kernel metadata updates | |
7843 | */ | |
7844 | void md_ack_all_badblocks(struct badblocks *bb) | |
7845 | { | |
7846 | if (bb->page == NULL || bb->changed) | |
7847 | /* no point even trying */ | |
7848 | return; | |
7849 | write_seqlock_irq(&bb->lock); | |
7850 | ||
7851 | if (bb->changed == 0) { | |
7852 | u64 *p = bb->page; | |
7853 | int i; | |
7854 | for (i = 0; i < bb->count ; i++) { | |
7855 | if (!BB_ACK(p[i])) { | |
7856 | sector_t start = BB_OFFSET(p[i]); | |
7857 | int len = BB_LEN(p[i]); | |
7858 | p[i] = BB_MAKE(start, len, 1); | |
7859 | } | |
7860 | } | |
7861 | } | |
7862 | write_sequnlock_irq(&bb->lock); | |
7863 | } | |
7864 | EXPORT_SYMBOL_GPL(md_ack_all_badblocks); | |
7865 | ||
16c791a5 N |
7866 | /* sysfs access to bad-blocks list. |
7867 | * We present two files. | |
7868 | * 'bad-blocks' lists sector numbers and lengths of ranges that | |
7869 | * are recorded as bad. The list is truncated to fit within | |
7870 | * the one-page limit of sysfs. | |
7871 | * Writing "sector length" to this file adds an acknowledged | |
7872 | * bad block list. | |
7873 | * 'unacknowledged-bad-blocks' lists bad blocks that have not yet | |
7874 | * been acknowledged. Writing to this file adds bad blocks | |
7875 | * without acknowledging them. This is largely for testing. | |
7876 | */ | |
7877 | ||
7878 | static ssize_t | |
7879 | badblocks_show(struct badblocks *bb, char *page, int unack) | |
7880 | { | |
7881 | size_t len; | |
7882 | int i; | |
7883 | u64 *p = bb->page; | |
7884 | unsigned seq; | |
7885 | ||
7886 | if (bb->shift < 0) | |
7887 | return 0; | |
7888 | ||
7889 | retry: | |
7890 | seq = read_seqbegin(&bb->lock); | |
7891 | ||
7892 | len = 0; | |
7893 | i = 0; | |
7894 | ||
7895 | while (len < PAGE_SIZE && i < bb->count) { | |
7896 | sector_t s = BB_OFFSET(p[i]); | |
7897 | unsigned int length = BB_LEN(p[i]); | |
7898 | int ack = BB_ACK(p[i]); | |
7899 | i++; | |
7900 | ||
7901 | if (unack && ack) | |
7902 | continue; | |
7903 | ||
7904 | len += snprintf(page+len, PAGE_SIZE-len, "%llu %u\n", | |
7905 | (unsigned long long)s << bb->shift, | |
7906 | length << bb->shift); | |
7907 | } | |
7908 | ||
7909 | if (read_seqretry(&bb->lock, seq)) | |
7910 | goto retry; | |
7911 | ||
7912 | return len; | |
7913 | } | |
7914 | ||
7915 | #define DO_DEBUG 1 | |
7916 | ||
7917 | static ssize_t | |
7918 | badblocks_store(struct badblocks *bb, const char *page, size_t len, int unack) | |
7919 | { | |
7920 | unsigned long long sector; | |
7921 | int length; | |
7922 | char newline; | |
7923 | #ifdef DO_DEBUG | |
7924 | /* Allow clearing via sysfs *only* for testing/debugging. | |
7925 | * Normally only a successful write may clear a badblock | |
7926 | */ | |
7927 | int clear = 0; | |
7928 | if (page[0] == '-') { | |
7929 | clear = 1; | |
7930 | page++; | |
7931 | } | |
7932 | #endif /* DO_DEBUG */ | |
7933 | ||
7934 | switch (sscanf(page, "%llu %d%c", §or, &length, &newline)) { | |
7935 | case 3: | |
7936 | if (newline != '\n') | |
7937 | return -EINVAL; | |
7938 | case 2: | |
7939 | if (length <= 0) | |
7940 | return -EINVAL; | |
7941 | break; | |
7942 | default: | |
7943 | return -EINVAL; | |
7944 | } | |
7945 | ||
7946 | #ifdef DO_DEBUG | |
7947 | if (clear) { | |
7948 | md_clear_badblocks(bb, sector, length); | |
7949 | return len; | |
7950 | } | |
7951 | #endif /* DO_DEBUG */ | |
7952 | if (md_set_badblocks(bb, sector, length, !unack)) | |
7953 | return len; | |
7954 | else | |
7955 | return -ENOSPC; | |
7956 | } | |
7957 | ||
75c96f85 AB |
7958 | static int md_notify_reboot(struct notifier_block *this, |
7959 | unsigned long code, void *x) | |
1da177e4 LT |
7960 | { |
7961 | struct list_head *tmp; | |
7962 | mddev_t *mddev; | |
7963 | ||
7964 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
7965 | ||
7966 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
7967 | ||
29ac4aa3 | 7968 | for_each_mddev(mddev, tmp) |
c71d4887 | 7969 | if (mddev_trylock(mddev)) { |
2b25000b N |
7970 | /* Force a switch to readonly even array |
7971 | * appears to still be in use. Hence | |
7972 | * the '100'. | |
7973 | */ | |
a4bd82d0 | 7974 | md_set_readonly(mddev, 100); |
c71d4887 NB |
7975 | mddev_unlock(mddev); |
7976 | } | |
1da177e4 LT |
7977 | /* |
7978 | * certain more exotic SCSI devices are known to be | |
7979 | * volatile wrt too early system reboots. While the | |
7980 | * right place to handle this issue is the given | |
7981 | * driver, we do want to have a safe RAID driver ... | |
7982 | */ | |
7983 | mdelay(1000*1); | |
7984 | } | |
7985 | return NOTIFY_DONE; | |
7986 | } | |
7987 | ||
75c96f85 | 7988 | static struct notifier_block md_notifier = { |
1da177e4 LT |
7989 | .notifier_call = md_notify_reboot, |
7990 | .next = NULL, | |
7991 | .priority = INT_MAX, /* before any real devices */ | |
7992 | }; | |
7993 | ||
7994 | static void md_geninit(void) | |
7995 | { | |
1da177e4 LT |
7996 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
7997 | ||
c7705f34 | 7998 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
7999 | } |
8000 | ||
75c96f85 | 8001 | static int __init md_init(void) |
1da177e4 | 8002 | { |
e804ac78 TH |
8003 | int ret = -ENOMEM; |
8004 | ||
ada609ee | 8005 | md_wq = alloc_workqueue("md", WQ_MEM_RECLAIM, 0); |
e804ac78 TH |
8006 | if (!md_wq) |
8007 | goto err_wq; | |
8008 | ||
8009 | md_misc_wq = alloc_workqueue("md_misc", 0, 0); | |
8010 | if (!md_misc_wq) | |
8011 | goto err_misc_wq; | |
8012 | ||
8013 | if ((ret = register_blkdev(MD_MAJOR, "md")) < 0) | |
8014 | goto err_md; | |
8015 | ||
8016 | if ((ret = register_blkdev(0, "mdp")) < 0) | |
8017 | goto err_mdp; | |
8018 | mdp_major = ret; | |
8019 | ||
3dbd8c2e | 8020 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
8021 | md_probe, NULL, NULL); |
8022 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
8023 | md_probe, NULL, NULL); |
8024 | ||
1da177e4 | 8025 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 8026 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
8027 | |
8028 | md_geninit(); | |
d710e138 | 8029 | return 0; |
1da177e4 | 8030 | |
e804ac78 TH |
8031 | err_mdp: |
8032 | unregister_blkdev(MD_MAJOR, "md"); | |
8033 | err_md: | |
8034 | destroy_workqueue(md_misc_wq); | |
8035 | err_misc_wq: | |
8036 | destroy_workqueue(md_wq); | |
8037 | err_wq: | |
8038 | return ret; | |
8039 | } | |
1da177e4 LT |
8040 | |
8041 | #ifndef MODULE | |
8042 | ||
8043 | /* | |
8044 | * Searches all registered partitions for autorun RAID arrays | |
8045 | * at boot time. | |
8046 | */ | |
4d936ec1 ME |
8047 | |
8048 | static LIST_HEAD(all_detected_devices); | |
8049 | struct detected_devices_node { | |
8050 | struct list_head list; | |
8051 | dev_t dev; | |
8052 | }; | |
1da177e4 LT |
8053 | |
8054 | void md_autodetect_dev(dev_t dev) | |
8055 | { | |
4d936ec1 ME |
8056 | struct detected_devices_node *node_detected_dev; |
8057 | ||
8058 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
8059 | if (node_detected_dev) { | |
8060 | node_detected_dev->dev = dev; | |
8061 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
8062 | } else { | |
8063 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
8064 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
8065 | } | |
1da177e4 LT |
8066 | } |
8067 | ||
8068 | ||
8069 | static void autostart_arrays(int part) | |
8070 | { | |
8071 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
8072 | struct detected_devices_node *node_detected_dev; |
8073 | dev_t dev; | |
8074 | int i_scanned, i_passed; | |
1da177e4 | 8075 | |
4d936ec1 ME |
8076 | i_scanned = 0; |
8077 | i_passed = 0; | |
1da177e4 | 8078 | |
4d936ec1 | 8079 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 8080 | |
4d936ec1 ME |
8081 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
8082 | i_scanned++; | |
8083 | node_detected_dev = list_entry(all_detected_devices.next, | |
8084 | struct detected_devices_node, list); | |
8085 | list_del(&node_detected_dev->list); | |
8086 | dev = node_detected_dev->dev; | |
8087 | kfree(node_detected_dev); | |
df968c4e | 8088 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
8089 | if (IS_ERR(rdev)) |
8090 | continue; | |
8091 | ||
b2d444d7 | 8092 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
8093 | MD_BUG(); |
8094 | continue; | |
8095 | } | |
d0fae18f | 8096 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 8097 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 8098 | i_passed++; |
1da177e4 | 8099 | } |
4d936ec1 ME |
8100 | |
8101 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
8102 | i_scanned, i_passed); | |
1da177e4 LT |
8103 | |
8104 | autorun_devices(part); | |
8105 | } | |
8106 | ||
fdee8ae4 | 8107 | #endif /* !MODULE */ |
1da177e4 LT |
8108 | |
8109 | static __exit void md_exit(void) | |
8110 | { | |
8111 | mddev_t *mddev; | |
8112 | struct list_head *tmp; | |
8ab5e4c1 | 8113 | |
3dbd8c2e | 8114 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 8115 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 8116 | |
3dbd8c2e | 8117 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
8118 | unregister_blkdev(mdp_major, "mdp"); |
8119 | unregister_reboot_notifier(&md_notifier); | |
8120 | unregister_sysctl_table(raid_table_header); | |
8121 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 8122 | for_each_mddev(mddev, tmp) { |
1da177e4 | 8123 | export_array(mddev); |
d3374825 | 8124 | mddev->hold_active = 0; |
1da177e4 | 8125 | } |
e804ac78 TH |
8126 | destroy_workqueue(md_misc_wq); |
8127 | destroy_workqueue(md_wq); | |
1da177e4 LT |
8128 | } |
8129 | ||
685784aa | 8130 | subsys_initcall(md_init); |
1da177e4 LT |
8131 | module_exit(md_exit) |
8132 | ||
f91de92e N |
8133 | static int get_ro(char *buffer, struct kernel_param *kp) |
8134 | { | |
8135 | return sprintf(buffer, "%d", start_readonly); | |
8136 | } | |
8137 | static int set_ro(const char *val, struct kernel_param *kp) | |
8138 | { | |
8139 | char *e; | |
8140 | int num = simple_strtoul(val, &e, 10); | |
8141 | if (*val && (*e == '\0' || *e == '\n')) { | |
8142 | start_readonly = num; | |
4dbcdc75 | 8143 | return 0; |
f91de92e N |
8144 | } |
8145 | return -EINVAL; | |
8146 | } | |
8147 | ||
80ca3a44 N |
8148 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
8149 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 8150 | |
efeb53c0 | 8151 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 8152 | |
1da177e4 LT |
8153 | EXPORT_SYMBOL(register_md_personality); |
8154 | EXPORT_SYMBOL(unregister_md_personality); | |
8155 | EXPORT_SYMBOL(md_error); | |
8156 | EXPORT_SYMBOL(md_done_sync); | |
8157 | EXPORT_SYMBOL(md_write_start); | |
8158 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
8159 | EXPORT_SYMBOL(md_register_thread); |
8160 | EXPORT_SYMBOL(md_unregister_thread); | |
8161 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
8162 | EXPORT_SYMBOL(md_check_recovery); |
8163 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 8164 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 8165 | MODULE_ALIAS("md"); |
72008652 | 8166 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |