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> |
1da177e4 | 39 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 40 | #include <linux/poll.h> |
16f17b39 | 41 | #include <linux/ctype.h> |
e7d2860b | 42 | #include <linux/string.h> |
fb4d8c76 N |
43 | #include <linux/hdreg.h> |
44 | #include <linux/proc_fs.h> | |
45 | #include <linux/random.h> | |
46 | #include <linux/reboot.h> | |
32a7627c | 47 | #include <linux/file.h> |
aa98aa31 | 48 | #include <linux/compat.h> |
25570727 | 49 | #include <linux/delay.h> |
bff61975 N |
50 | #include <linux/raid/md_p.h> |
51 | #include <linux/raid/md_u.h> | |
5a0e3ad6 | 52 | #include <linux/slab.h> |
43b2e5d8 | 53 | #include "md.h" |
ef740c37 | 54 | #include "bitmap.h" |
1da177e4 LT |
55 | |
56 | #define DEBUG 0 | |
57 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
58 | ||
59 | ||
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 BS |
69 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
70 | ||
5e56341d AB |
71 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
72 | ||
1e50915f RB |
73 | /* |
74 | * Default number of read corrections we'll attempt on an rdev | |
75 | * before ejecting it from the array. We divide the read error | |
76 | * count by 2 for every hour elapsed between read errors. | |
77 | */ | |
78 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
79 | /* |
80 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
81 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
82 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 83 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
84 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
85 | * speed limit - in case reconstruction slows down your system despite | |
86 | * idle IO detection. | |
87 | * | |
88 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 89 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
90 | */ |
91 | ||
92 | static int sysctl_speed_limit_min = 1000; | |
93 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
94 | static inline int speed_min(mddev_t *mddev) |
95 | { | |
96 | return mddev->sync_speed_min ? | |
97 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
98 | } | |
99 | ||
100 | static inline int speed_max(mddev_t *mddev) | |
101 | { | |
102 | return mddev->sync_speed_max ? | |
103 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
104 | } | |
1da177e4 LT |
105 | |
106 | static struct ctl_table_header *raid_table_header; | |
107 | ||
108 | static ctl_table raid_table[] = { | |
109 | { | |
1da177e4 LT |
110 | .procname = "speed_limit_min", |
111 | .data = &sysctl_speed_limit_min, | |
112 | .maxlen = sizeof(int), | |
80ca3a44 | 113 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 114 | .proc_handler = proc_dointvec, |
1da177e4 LT |
115 | }, |
116 | { | |
1da177e4 LT |
117 | .procname = "speed_limit_max", |
118 | .data = &sysctl_speed_limit_max, | |
119 | .maxlen = sizeof(int), | |
80ca3a44 | 120 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 121 | .proc_handler = proc_dointvec, |
1da177e4 | 122 | }, |
894d2491 | 123 | { } |
1da177e4 LT |
124 | }; |
125 | ||
126 | static ctl_table raid_dir_table[] = { | |
127 | { | |
1da177e4 LT |
128 | .procname = "raid", |
129 | .maxlen = 0, | |
80ca3a44 | 130 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
131 | .child = raid_table, |
132 | }, | |
894d2491 | 133 | { } |
1da177e4 LT |
134 | }; |
135 | ||
136 | static ctl_table raid_root_table[] = { | |
137 | { | |
1da177e4 LT |
138 | .procname = "dev", |
139 | .maxlen = 0, | |
140 | .mode = 0555, | |
141 | .child = raid_dir_table, | |
142 | }, | |
894d2491 | 143 | { } |
1da177e4 LT |
144 | }; |
145 | ||
83d5cde4 | 146 | static const struct block_device_operations md_fops; |
1da177e4 | 147 | |
f91de92e N |
148 | static int start_readonly; |
149 | ||
d7603b7e N |
150 | /* |
151 | * We have a system wide 'event count' that is incremented | |
152 | * on any 'interesting' event, and readers of /proc/mdstat | |
153 | * can use 'poll' or 'select' to find out when the event | |
154 | * count increases. | |
155 | * | |
156 | * Events are: | |
157 | * start array, stop array, error, add device, remove device, | |
158 | * start build, activate spare | |
159 | */ | |
2989ddbd | 160 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 161 | static atomic_t md_event_count; |
29269553 | 162 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
163 | { |
164 | atomic_inc(&md_event_count); | |
165 | wake_up(&md_event_waiters); | |
166 | } | |
29269553 | 167 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 168 | |
c331eb04 N |
169 | /* Alternate version that can be called from interrupts |
170 | * when calling sysfs_notify isn't needed. | |
171 | */ | |
05381954 | 172 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
173 | { |
174 | atomic_inc(&md_event_count); | |
175 | wake_up(&md_event_waiters); | |
176 | } | |
177 | ||
1da177e4 LT |
178 | /* |
179 | * Enables to iterate over all existing md arrays | |
180 | * all_mddevs_lock protects this list. | |
181 | */ | |
182 | static LIST_HEAD(all_mddevs); | |
183 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
184 | ||
185 | ||
186 | /* | |
187 | * iterates through all used mddevs in the system. | |
188 | * We take care to grab the all_mddevs_lock whenever navigating | |
189 | * the list, and to always hold a refcount when unlocked. | |
190 | * Any code which breaks out of this loop while own | |
191 | * a reference to the current mddev and must mddev_put it. | |
192 | */ | |
29ac4aa3 | 193 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
194 | \ |
195 | for (({ spin_lock(&all_mddevs_lock); \ | |
196 | tmp = all_mddevs.next; \ | |
197 | mddev = NULL;}); \ | |
198 | ({ if (tmp != &all_mddevs) \ | |
199 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
200 | spin_unlock(&all_mddevs_lock); \ | |
201 | if (mddev) mddev_put(mddev); \ | |
202 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
203 | tmp != &all_mddevs;}); \ | |
204 | ({ spin_lock(&all_mddevs_lock); \ | |
205 | tmp = tmp->next;}) \ | |
206 | ) | |
207 | ||
208 | ||
409c57f3 N |
209 | /* Rather than calling directly into the personality make_request function, |
210 | * IO requests come here first so that we can check if the device is | |
211 | * being suspended pending a reconfiguration. | |
212 | * We hold a refcount over the call to ->make_request. By the time that | |
213 | * call has finished, the bio has been linked into some internal structure | |
214 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
215 | */ | |
216 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 217 | { |
49077326 | 218 | const int rw = bio_data_dir(bio); |
409c57f3 N |
219 | mddev_t *mddev = q->queuedata; |
220 | int rv; | |
49077326 N |
221 | int cpu; |
222 | ||
409c57f3 N |
223 | if (mddev == NULL || mddev->pers == NULL) { |
224 | bio_io_error(bio); | |
225 | return 0; | |
226 | } | |
227 | rcu_read_lock(); | |
a2826aa9 | 228 | if (mddev->suspended || mddev->barrier) { |
409c57f3 N |
229 | DEFINE_WAIT(__wait); |
230 | for (;;) { | |
231 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
232 | TASK_UNINTERRUPTIBLE); | |
a2826aa9 | 233 | if (!mddev->suspended && !mddev->barrier) |
409c57f3 N |
234 | break; |
235 | rcu_read_unlock(); | |
236 | schedule(); | |
237 | rcu_read_lock(); | |
238 | } | |
239 | finish_wait(&mddev->sb_wait, &__wait); | |
240 | } | |
241 | atomic_inc(&mddev->active_io); | |
242 | rcu_read_unlock(); | |
49077326 | 243 | |
21a52c6d | 244 | rv = mddev->pers->make_request(mddev, bio); |
49077326 N |
245 | |
246 | cpu = part_stat_lock(); | |
247 | part_stat_inc(cpu, &mddev->gendisk->part0, ios[rw]); | |
248 | part_stat_add(cpu, &mddev->gendisk->part0, sectors[rw], | |
249 | bio_sectors(bio)); | |
250 | part_stat_unlock(); | |
251 | ||
409c57f3 N |
252 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) |
253 | wake_up(&mddev->sb_wait); | |
254 | ||
255 | return rv; | |
256 | } | |
257 | ||
9e35b99c N |
258 | /* mddev_suspend makes sure no new requests are submitted |
259 | * to the device, and that any requests that have been submitted | |
260 | * are completely handled. | |
261 | * Once ->stop is called and completes, the module will be completely | |
262 | * unused. | |
263 | */ | |
409c57f3 N |
264 | static void mddev_suspend(mddev_t *mddev) |
265 | { | |
266 | BUG_ON(mddev->suspended); | |
267 | mddev->suspended = 1; | |
268 | synchronize_rcu(); | |
269 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
270 | mddev->pers->quiesce(mddev, 1); | |
409c57f3 N |
271 | } |
272 | ||
273 | static void mddev_resume(mddev_t *mddev) | |
274 | { | |
275 | mddev->suspended = 0; | |
276 | wake_up(&mddev->sb_wait); | |
277 | mddev->pers->quiesce(mddev, 0); | |
1da177e4 LT |
278 | } |
279 | ||
3fa841d7 N |
280 | int mddev_congested(mddev_t *mddev, int bits) |
281 | { | |
a2826aa9 N |
282 | if (mddev->barrier) |
283 | return 1; | |
3fa841d7 N |
284 | return mddev->suspended; |
285 | } | |
286 | EXPORT_SYMBOL(mddev_congested); | |
287 | ||
a2826aa9 N |
288 | /* |
289 | * Generic barrier handling for md | |
290 | */ | |
291 | ||
292 | #define POST_REQUEST_BARRIER ((void*)1) | |
293 | ||
294 | static void md_end_barrier(struct bio *bio, int err) | |
295 | { | |
296 | mdk_rdev_t *rdev = bio->bi_private; | |
297 | mddev_t *mddev = rdev->mddev; | |
298 | if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER) | |
299 | set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags); | |
300 | ||
301 | rdev_dec_pending(rdev, mddev); | |
302 | ||
303 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
304 | if (mddev->barrier == POST_REQUEST_BARRIER) { | |
305 | /* This was a post-request barrier */ | |
306 | mddev->barrier = NULL; | |
307 | wake_up(&mddev->sb_wait); | |
308 | } else | |
309 | /* The pre-request barrier has finished */ | |
310 | schedule_work(&mddev->barrier_work); | |
311 | } | |
312 | bio_put(bio); | |
313 | } | |
314 | ||
315 | static void submit_barriers(mddev_t *mddev) | |
316 | { | |
317 | mdk_rdev_t *rdev; | |
318 | ||
319 | rcu_read_lock(); | |
320 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
321 | if (rdev->raid_disk >= 0 && | |
322 | !test_bit(Faulty, &rdev->flags)) { | |
323 | /* Take two references, one is dropped | |
324 | * when request finishes, one after | |
325 | * we reclaim rcu_read_lock | |
326 | */ | |
327 | struct bio *bi; | |
328 | atomic_inc(&rdev->nr_pending); | |
329 | atomic_inc(&rdev->nr_pending); | |
330 | rcu_read_unlock(); | |
331 | bi = bio_alloc(GFP_KERNEL, 0); | |
332 | bi->bi_end_io = md_end_barrier; | |
333 | bi->bi_private = rdev; | |
334 | bi->bi_bdev = rdev->bdev; | |
335 | atomic_inc(&mddev->flush_pending); | |
336 | submit_bio(WRITE_BARRIER, bi); | |
337 | rcu_read_lock(); | |
338 | rdev_dec_pending(rdev, mddev); | |
339 | } | |
340 | rcu_read_unlock(); | |
341 | } | |
342 | ||
343 | static void md_submit_barrier(struct work_struct *ws) | |
344 | { | |
345 | mddev_t *mddev = container_of(ws, mddev_t, barrier_work); | |
346 | struct bio *bio = mddev->barrier; | |
347 | ||
348 | atomic_set(&mddev->flush_pending, 1); | |
349 | ||
350 | if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags)) | |
351 | bio_endio(bio, -EOPNOTSUPP); | |
352 | else if (bio->bi_size == 0) | |
353 | /* an empty barrier - all done */ | |
354 | bio_endio(bio, 0); | |
355 | else { | |
356 | bio->bi_rw &= ~(1<<BIO_RW_BARRIER); | |
21a52c6d | 357 | if (mddev->pers->make_request(mddev, bio)) |
a2826aa9 N |
358 | generic_make_request(bio); |
359 | mddev->barrier = POST_REQUEST_BARRIER; | |
360 | submit_barriers(mddev); | |
361 | } | |
362 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
363 | mddev->barrier = NULL; | |
364 | wake_up(&mddev->sb_wait); | |
365 | } | |
366 | } | |
367 | ||
368 | void md_barrier_request(mddev_t *mddev, struct bio *bio) | |
369 | { | |
370 | spin_lock_irq(&mddev->write_lock); | |
371 | wait_event_lock_irq(mddev->sb_wait, | |
372 | !mddev->barrier, | |
373 | mddev->write_lock, /*nothing*/); | |
374 | mddev->barrier = bio; | |
375 | spin_unlock_irq(&mddev->write_lock); | |
376 | ||
377 | atomic_set(&mddev->flush_pending, 1); | |
378 | INIT_WORK(&mddev->barrier_work, md_submit_barrier); | |
379 | ||
380 | submit_barriers(mddev); | |
381 | ||
382 | if (atomic_dec_and_test(&mddev->flush_pending)) | |
383 | schedule_work(&mddev->barrier_work); | |
384 | } | |
385 | EXPORT_SYMBOL(md_barrier_request); | |
409c57f3 | 386 | |
1da177e4 LT |
387 | static inline mddev_t *mddev_get(mddev_t *mddev) |
388 | { | |
389 | atomic_inc(&mddev->active); | |
390 | return mddev; | |
391 | } | |
392 | ||
5fd3a17e | 393 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 394 | |
1da177e4 LT |
395 | static void mddev_put(mddev_t *mddev) |
396 | { | |
397 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
398 | return; | |
d3374825 | 399 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
cbd19983 N |
400 | mddev->ctime == 0 && !mddev->hold_active) { |
401 | /* Array is not configured at all, and not held active, | |
402 | * so destroy it */ | |
1da177e4 | 403 | list_del(&mddev->all_mddevs); |
d3374825 N |
404 | if (mddev->gendisk) { |
405 | /* we did a probe so need to clean up. | |
406 | * Call schedule_work inside the spinlock | |
407 | * so that flush_scheduled_work() after | |
408 | * mddev_find will succeed in waiting for the | |
409 | * work to be done. | |
410 | */ | |
411 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
412 | schedule_work(&mddev->del_work); | |
413 | } else | |
414 | kfree(mddev); | |
415 | } | |
416 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
417 | } |
418 | ||
fafd7fb0 N |
419 | static void mddev_init(mddev_t *mddev) |
420 | { | |
421 | mutex_init(&mddev->open_mutex); | |
422 | mutex_init(&mddev->reconfig_mutex); | |
423 | mutex_init(&mddev->bitmap_info.mutex); | |
424 | INIT_LIST_HEAD(&mddev->disks); | |
425 | INIT_LIST_HEAD(&mddev->all_mddevs); | |
426 | init_timer(&mddev->safemode_timer); | |
427 | atomic_set(&mddev->active, 1); | |
428 | atomic_set(&mddev->openers, 0); | |
429 | atomic_set(&mddev->active_io, 0); | |
430 | spin_lock_init(&mddev->write_lock); | |
431 | atomic_set(&mddev->flush_pending, 0); | |
432 | init_waitqueue_head(&mddev->sb_wait); | |
433 | init_waitqueue_head(&mddev->recovery_wait); | |
434 | mddev->reshape_position = MaxSector; | |
435 | mddev->resync_min = 0; | |
436 | mddev->resync_max = MaxSector; | |
437 | mddev->level = LEVEL_NONE; | |
438 | } | |
439 | ||
1da177e4 LT |
440 | static mddev_t * mddev_find(dev_t unit) |
441 | { | |
442 | mddev_t *mddev, *new = NULL; | |
443 | ||
444 | retry: | |
445 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
446 | |
447 | if (unit) { | |
448 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
449 | if (mddev->unit == unit) { | |
450 | mddev_get(mddev); | |
451 | spin_unlock(&all_mddevs_lock); | |
452 | kfree(new); | |
453 | return mddev; | |
454 | } | |
455 | ||
456 | if (new) { | |
457 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 458 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
459 | new->hold_active = UNTIL_IOCTL; |
460 | return new; | |
1da177e4 | 461 | } |
efeb53c0 N |
462 | } else if (new) { |
463 | /* find an unused unit number */ | |
464 | static int next_minor = 512; | |
465 | int start = next_minor; | |
466 | int is_free = 0; | |
467 | int dev = 0; | |
468 | while (!is_free) { | |
469 | dev = MKDEV(MD_MAJOR, next_minor); | |
470 | next_minor++; | |
471 | if (next_minor > MINORMASK) | |
472 | next_minor = 0; | |
473 | if (next_minor == start) { | |
474 | /* Oh dear, all in use. */ | |
475 | spin_unlock(&all_mddevs_lock); | |
476 | kfree(new); | |
477 | return NULL; | |
478 | } | |
479 | ||
480 | is_free = 1; | |
481 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
482 | if (mddev->unit == dev) { | |
483 | is_free = 0; | |
484 | break; | |
485 | } | |
486 | } | |
487 | new->unit = dev; | |
488 | new->md_minor = MINOR(dev); | |
489 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
490 | list_add(&new->all_mddevs, &all_mddevs); |
491 | spin_unlock(&all_mddevs_lock); | |
492 | return new; | |
493 | } | |
494 | spin_unlock(&all_mddevs_lock); | |
495 | ||
9ffae0cf | 496 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
497 | if (!new) |
498 | return NULL; | |
499 | ||
1da177e4 LT |
500 | new->unit = unit; |
501 | if (MAJOR(unit) == MD_MAJOR) | |
502 | new->md_minor = MINOR(unit); | |
503 | else | |
504 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
505 | ||
fafd7fb0 | 506 | mddev_init(new); |
1da177e4 | 507 | |
1da177e4 LT |
508 | goto retry; |
509 | } | |
510 | ||
511 | static inline int mddev_lock(mddev_t * mddev) | |
512 | { | |
df5b89b3 | 513 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
514 | } |
515 | ||
b522adcd DW |
516 | static inline int mddev_is_locked(mddev_t *mddev) |
517 | { | |
518 | return mutex_is_locked(&mddev->reconfig_mutex); | |
519 | } | |
520 | ||
1da177e4 LT |
521 | static inline int mddev_trylock(mddev_t * mddev) |
522 | { | |
df5b89b3 | 523 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
524 | } |
525 | ||
b6eb127d N |
526 | static struct attribute_group md_redundancy_group; |
527 | ||
a64c876f | 528 | static void mddev_unlock(mddev_t * mddev) |
1da177e4 | 529 | { |
a64c876f | 530 | if (mddev->to_remove) { |
b6eb127d N |
531 | /* These cannot be removed under reconfig_mutex as |
532 | * an access to the files will try to take reconfig_mutex | |
533 | * while holding the file unremovable, which leads to | |
534 | * a deadlock. | |
535 | * So hold open_mutex instead - we are allowed to take | |
536 | * it while holding reconfig_mutex, and md_run can | |
537 | * use it to wait for the remove to complete. | |
538 | */ | |
a64c876f N |
539 | struct attribute_group *to_remove = mddev->to_remove; |
540 | mddev->to_remove = NULL; | |
b6eb127d N |
541 | mutex_lock(&mddev->open_mutex); |
542 | mutex_unlock(&mddev->reconfig_mutex); | |
543 | ||
a64c876f N |
544 | if (to_remove != &md_redundancy_group) |
545 | sysfs_remove_group(&mddev->kobj, to_remove); | |
546 | if (mddev->pers == NULL || | |
547 | mddev->pers->sync_request == NULL) { | |
548 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
549 | if (mddev->sysfs_action) | |
550 | sysfs_put(mddev->sysfs_action); | |
551 | mddev->sysfs_action = NULL; | |
552 | } | |
b6eb127d N |
553 | mutex_unlock(&mddev->open_mutex); |
554 | } else | |
555 | mutex_unlock(&mddev->reconfig_mutex); | |
1da177e4 | 556 | |
005eca5e | 557 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
558 | } |
559 | ||
2989ddbd | 560 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 561 | { |
159ec1fc | 562 | mdk_rdev_t *rdev; |
1da177e4 | 563 | |
159ec1fc | 564 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
565 | if (rdev->desc_nr == nr) |
566 | return rdev; | |
159ec1fc | 567 | |
1da177e4 LT |
568 | return NULL; |
569 | } | |
570 | ||
571 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
572 | { | |
1da177e4 LT |
573 | mdk_rdev_t *rdev; |
574 | ||
159ec1fc | 575 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
576 | if (rdev->bdev->bd_dev == dev) |
577 | return rdev; | |
159ec1fc | 578 | |
1da177e4 LT |
579 | return NULL; |
580 | } | |
581 | ||
d9d166c2 | 582 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
583 | { |
584 | struct mdk_personality *pers; | |
d9d166c2 N |
585 | list_for_each_entry(pers, &pers_list, list) { |
586 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 587 | return pers; |
d9d166c2 N |
588 | if (strcmp(pers->name, clevel)==0) |
589 | return pers; | |
590 | } | |
2604b703 N |
591 | return NULL; |
592 | } | |
593 | ||
b73df2d3 | 594 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 595 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 596 | { |
b73df2d3 AN |
597 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
598 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
599 | } |
600 | ||
1da177e4 LT |
601 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
602 | { | |
603 | if (rdev->sb_page) | |
604 | MD_BUG(); | |
605 | ||
606 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
607 | if (!rdev->sb_page) { | |
608 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 609 | return -ENOMEM; |
1da177e4 LT |
610 | } |
611 | ||
612 | return 0; | |
613 | } | |
614 | ||
615 | static void free_disk_sb(mdk_rdev_t * rdev) | |
616 | { | |
617 | if (rdev->sb_page) { | |
2d1f3b5d | 618 | put_page(rdev->sb_page); |
1da177e4 LT |
619 | rdev->sb_loaded = 0; |
620 | rdev->sb_page = NULL; | |
0f420358 | 621 | rdev->sb_start = 0; |
dd8ac336 | 622 | rdev->sectors = 0; |
1da177e4 LT |
623 | } |
624 | } | |
625 | ||
626 | ||
6712ecf8 | 627 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
628 | { |
629 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 630 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 631 | |
3a0f5bbb N |
632 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
633 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
634 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
635 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 636 | md_error(mddev, rdev); |
3a0f5bbb | 637 | } |
7bfa19f2 | 638 | |
a9701a30 N |
639 | if (atomic_dec_and_test(&mddev->pending_writes)) |
640 | wake_up(&mddev->sb_wait); | |
f8b58edf | 641 | bio_put(bio); |
7bfa19f2 N |
642 | } |
643 | ||
6712ecf8 | 644 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
645 | { |
646 | struct bio *bio2 = bio->bi_private; | |
647 | mdk_rdev_t *rdev = bio2->bi_private; | |
648 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
649 | |
650 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
651 | error == -EOPNOTSUPP) { | |
652 | unsigned long flags; | |
653 | /* barriers don't appear to be supported :-( */ | |
654 | set_bit(BarriersNotsupp, &rdev->flags); | |
655 | mddev->barriers_work = 0; | |
656 | spin_lock_irqsave(&mddev->write_lock, flags); | |
657 | bio2->bi_next = mddev->biolist; | |
658 | mddev->biolist = bio2; | |
659 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
660 | wake_up(&mddev->sb_wait); | |
661 | bio_put(bio); | |
6712ecf8 N |
662 | } else { |
663 | bio_put(bio2); | |
664 | bio->bi_private = rdev; | |
665 | super_written(bio, error); | |
a9701a30 | 666 | } |
a9701a30 N |
667 | } |
668 | ||
7bfa19f2 N |
669 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
670 | sector_t sector, int size, struct page *page) | |
671 | { | |
672 | /* write first size bytes of page to sector of rdev | |
673 | * Increment mddev->pending_writes before returning | |
674 | * and decrement it on completion, waking up sb_wait | |
675 | * if zero is reached. | |
676 | * If an error occurred, call md_error | |
a9701a30 N |
677 | * |
678 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
679 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
680 | */ |
681 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
93dbb393 | 682 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); |
7bfa19f2 N |
683 | |
684 | bio->bi_bdev = rdev->bdev; | |
685 | bio->bi_sector = sector; | |
686 | bio_add_page(bio, page, size, 0); | |
687 | bio->bi_private = rdev; | |
688 | bio->bi_end_io = super_written; | |
a9701a30 N |
689 | bio->bi_rw = rw; |
690 | ||
7bfa19f2 | 691 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
692 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
693 | struct bio *rbio; | |
694 | rw |= (1<<BIO_RW_BARRIER); | |
695 | rbio = bio_clone(bio, GFP_NOIO); | |
696 | rbio->bi_private = bio; | |
697 | rbio->bi_end_io = super_written_barrier; | |
698 | submit_bio(rw, rbio); | |
699 | } else | |
700 | submit_bio(rw, bio); | |
701 | } | |
702 | ||
703 | void md_super_wait(mddev_t *mddev) | |
704 | { | |
705 | /* wait for all superblock writes that were scheduled to complete. | |
706 | * if any had to be retried (due to BARRIER problems), retry them | |
707 | */ | |
708 | DEFINE_WAIT(wq); | |
709 | for(;;) { | |
710 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
711 | if (atomic_read(&mddev->pending_writes)==0) | |
712 | break; | |
713 | while (mddev->biolist) { | |
714 | struct bio *bio; | |
715 | spin_lock_irq(&mddev->write_lock); | |
716 | bio = mddev->biolist; | |
717 | mddev->biolist = bio->bi_next ; | |
718 | bio->bi_next = NULL; | |
719 | spin_unlock_irq(&mddev->write_lock); | |
720 | submit_bio(bio->bi_rw, bio); | |
721 | } | |
722 | schedule(); | |
723 | } | |
724 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
725 | } |
726 | ||
6712ecf8 | 727 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 728 | { |
1da177e4 | 729 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
730 | } |
731 | ||
a654b9d8 | 732 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
733 | struct page *page, int rw) |
734 | { | |
baaa2c51 | 735 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
736 | struct completion event; |
737 | int ret; | |
738 | ||
93dbb393 | 739 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); |
1da177e4 LT |
740 | |
741 | bio->bi_bdev = bdev; | |
742 | bio->bi_sector = sector; | |
743 | bio_add_page(bio, page, size, 0); | |
744 | init_completion(&event); | |
745 | bio->bi_private = &event; | |
746 | bio->bi_end_io = bi_complete; | |
747 | submit_bio(rw, bio); | |
748 | wait_for_completion(&event); | |
749 | ||
750 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
751 | bio_put(bio); | |
752 | return ret; | |
753 | } | |
a8745db2 | 754 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 755 | |
0002b271 | 756 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
757 | { |
758 | char b[BDEVNAME_SIZE]; | |
759 | if (!rdev->sb_page) { | |
760 | MD_BUG(); | |
761 | return -EINVAL; | |
762 | } | |
763 | if (rdev->sb_loaded) | |
764 | return 0; | |
765 | ||
766 | ||
0f420358 | 767 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
768 | goto fail; |
769 | rdev->sb_loaded = 1; | |
770 | return 0; | |
771 | ||
772 | fail: | |
773 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
774 | bdevname(rdev->bdev,b)); | |
775 | return -EINVAL; | |
776 | } | |
777 | ||
778 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
779 | { | |
05710466 AN |
780 | return sb1->set_uuid0 == sb2->set_uuid0 && |
781 | sb1->set_uuid1 == sb2->set_uuid1 && | |
782 | sb1->set_uuid2 == sb2->set_uuid2 && | |
783 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
784 | } |
785 | ||
1da177e4 LT |
786 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
787 | { | |
788 | int ret; | |
789 | mdp_super_t *tmp1, *tmp2; | |
790 | ||
791 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
792 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
793 | ||
794 | if (!tmp1 || !tmp2) { | |
795 | ret = 0; | |
35020f1a | 796 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
797 | goto abort; |
798 | } | |
799 | ||
800 | *tmp1 = *sb1; | |
801 | *tmp2 = *sb2; | |
802 | ||
803 | /* | |
804 | * nr_disks is not constant | |
805 | */ | |
806 | tmp1->nr_disks = 0; | |
807 | tmp2->nr_disks = 0; | |
808 | ||
ce0c8e05 | 809 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 810 | abort: |
990a8baf JJ |
811 | kfree(tmp1); |
812 | kfree(tmp2); | |
1da177e4 LT |
813 | return ret; |
814 | } | |
815 | ||
4d167f09 N |
816 | |
817 | static u32 md_csum_fold(u32 csum) | |
818 | { | |
819 | csum = (csum & 0xffff) + (csum >> 16); | |
820 | return (csum & 0xffff) + (csum >> 16); | |
821 | } | |
822 | ||
1da177e4 LT |
823 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
824 | { | |
4d167f09 N |
825 | u64 newcsum = 0; |
826 | u32 *sb32 = (u32*)sb; | |
827 | int i; | |
1da177e4 LT |
828 | unsigned int disk_csum, csum; |
829 | ||
830 | disk_csum = sb->sb_csum; | |
831 | sb->sb_csum = 0; | |
4d167f09 N |
832 | |
833 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
834 | newcsum += sb32[i]; | |
835 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
836 | ||
837 | ||
838 | #ifdef CONFIG_ALPHA | |
839 | /* This used to use csum_partial, which was wrong for several | |
840 | * reasons including that different results are returned on | |
841 | * different architectures. It isn't critical that we get exactly | |
842 | * the same return value as before (we always csum_fold before | |
843 | * testing, and that removes any differences). However as we | |
844 | * know that csum_partial always returned a 16bit value on | |
845 | * alphas, do a fold to maximise conformity to previous behaviour. | |
846 | */ | |
847 | sb->sb_csum = md_csum_fold(disk_csum); | |
848 | #else | |
1da177e4 | 849 | sb->sb_csum = disk_csum; |
4d167f09 | 850 | #endif |
1da177e4 LT |
851 | return csum; |
852 | } | |
853 | ||
854 | ||
855 | /* | |
856 | * Handle superblock details. | |
857 | * We want to be able to handle multiple superblock formats | |
858 | * so we have a common interface to them all, and an array of | |
859 | * different handlers. | |
860 | * We rely on user-space to write the initial superblock, and support | |
861 | * reading and updating of superblocks. | |
862 | * Interface methods are: | |
863 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
864 | * loads and validates a superblock on dev. | |
865 | * if refdev != NULL, compare superblocks on both devices | |
866 | * Return: | |
867 | * 0 - dev has a superblock that is compatible with refdev | |
868 | * 1 - dev has a superblock that is compatible and newer than refdev | |
869 | * so dev should be used as the refdev in future | |
870 | * -EINVAL superblock incompatible or invalid | |
871 | * -othererror e.g. -EIO | |
872 | * | |
873 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
874 | * Verify that dev is acceptable into mddev. | |
875 | * The first time, mddev->raid_disks will be 0, and data from | |
876 | * dev should be merged in. Subsequent calls check that dev | |
877 | * is new enough. Return 0 or -EINVAL | |
878 | * | |
879 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
880 | * Update the superblock for rdev with data in mddev | |
881 | * This does not write to disc. | |
882 | * | |
883 | */ | |
884 | ||
885 | struct super_type { | |
0cd17fec CW |
886 | char *name; |
887 | struct module *owner; | |
888 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
889 | int minor_version); | |
890 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
891 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
892 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 893 | sector_t num_sectors); |
1da177e4 LT |
894 | }; |
895 | ||
0894cc30 AN |
896 | /* |
897 | * Check that the given mddev has no bitmap. | |
898 | * | |
899 | * This function is called from the run method of all personalities that do not | |
900 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
901 | * has a bitmap. Otherwise, it returns 0. | |
902 | * | |
903 | */ | |
904 | int md_check_no_bitmap(mddev_t *mddev) | |
905 | { | |
c3d9714e | 906 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
907 | return 0; |
908 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
909 | mdname(mddev), mddev->pers->name); | |
910 | return 1; | |
911 | } | |
912 | EXPORT_SYMBOL(md_check_no_bitmap); | |
913 | ||
1da177e4 LT |
914 | /* |
915 | * load_super for 0.90.0 | |
916 | */ | |
917 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
918 | { | |
919 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
920 | mdp_super_t *sb; | |
921 | int ret; | |
1da177e4 LT |
922 | |
923 | /* | |
0f420358 | 924 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
925 | * it's at the end of the disk. |
926 | * | |
927 | * It also happens to be a multiple of 4Kb. | |
928 | */ | |
0f420358 | 929 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 930 | |
0002b271 | 931 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
932 | if (ret) return ret; |
933 | ||
934 | ret = -EINVAL; | |
935 | ||
936 | bdevname(rdev->bdev, b); | |
937 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
938 | ||
939 | if (sb->md_magic != MD_SB_MAGIC) { | |
940 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
941 | b); | |
942 | goto abort; | |
943 | } | |
944 | ||
945 | if (sb->major_version != 0 || | |
f6705578 N |
946 | sb->minor_version < 90 || |
947 | sb->minor_version > 91) { | |
1da177e4 LT |
948 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
949 | sb->major_version, sb->minor_version, | |
950 | b); | |
951 | goto abort; | |
952 | } | |
953 | ||
954 | if (sb->raid_disks <= 0) | |
955 | goto abort; | |
956 | ||
4d167f09 | 957 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
958 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
959 | b); | |
960 | goto abort; | |
961 | } | |
962 | ||
963 | rdev->preferred_minor = sb->md_minor; | |
964 | rdev->data_offset = 0; | |
0002b271 | 965 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
966 | |
967 | if (sb->level == LEVEL_MULTIPATH) | |
968 | rdev->desc_nr = -1; | |
969 | else | |
970 | rdev->desc_nr = sb->this_disk.number; | |
971 | ||
9a7b2b0f | 972 | if (!refdev) { |
1da177e4 | 973 | ret = 1; |
9a7b2b0f | 974 | } else { |
1da177e4 LT |
975 | __u64 ev1, ev2; |
976 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
977 | if (!uuid_equal(refsb, sb)) { | |
978 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
979 | b, bdevname(refdev->bdev,b2)); | |
980 | goto abort; | |
981 | } | |
982 | if (!sb_equal(refsb, sb)) { | |
983 | printk(KERN_WARNING "md: %s has same UUID" | |
984 | " but different superblock to %s\n", | |
985 | b, bdevname(refdev->bdev, b2)); | |
986 | goto abort; | |
987 | } | |
988 | ev1 = md_event(sb); | |
989 | ev2 = md_event(refsb); | |
990 | if (ev1 > ev2) | |
991 | ret = 1; | |
992 | else | |
993 | ret = 0; | |
994 | } | |
8190e754 | 995 | rdev->sectors = rdev->sb_start; |
1da177e4 | 996 | |
dd8ac336 | 997 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
998 | /* "this cannot possibly happen" ... */ |
999 | ret = -EINVAL; | |
1000 | ||
1da177e4 LT |
1001 | abort: |
1002 | return ret; | |
1003 | } | |
1004 | ||
1005 | /* | |
1006 | * validate_super for 0.90.0 | |
1007 | */ | |
1008 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1009 | { | |
1010 | mdp_disk_t *desc; | |
1011 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 1012 | __u64 ev1 = md_event(sb); |
1da177e4 | 1013 | |
41158c7e | 1014 | rdev->raid_disk = -1; |
c5d79adb N |
1015 | clear_bit(Faulty, &rdev->flags); |
1016 | clear_bit(In_sync, &rdev->flags); | |
1017 | clear_bit(WriteMostly, &rdev->flags); | |
1018 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1019 | ||
1da177e4 LT |
1020 | if (mddev->raid_disks == 0) { |
1021 | mddev->major_version = 0; | |
1022 | mddev->minor_version = sb->minor_version; | |
1023 | mddev->patch_version = sb->patch_version; | |
e691063a | 1024 | mddev->external = 0; |
9d8f0363 | 1025 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
1026 | mddev->ctime = sb->ctime; |
1027 | mddev->utime = sb->utime; | |
1028 | mddev->level = sb->level; | |
d9d166c2 | 1029 | mddev->clevel[0] = 0; |
1da177e4 LT |
1030 | mddev->layout = sb->layout; |
1031 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 1032 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 1033 | mddev->events = ev1; |
c3d9714e N |
1034 | mddev->bitmap_info.offset = 0; |
1035 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 1036 | |
f6705578 N |
1037 | if (mddev->minor_version >= 91) { |
1038 | mddev->reshape_position = sb->reshape_position; | |
1039 | mddev->delta_disks = sb->delta_disks; | |
1040 | mddev->new_level = sb->new_level; | |
1041 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 1042 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
1043 | } else { |
1044 | mddev->reshape_position = MaxSector; | |
1045 | mddev->delta_disks = 0; | |
1046 | mddev->new_level = mddev->level; | |
1047 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1048 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1049 | } |
1050 | ||
1da177e4 LT |
1051 | if (sb->state & (1<<MD_SB_CLEAN)) |
1052 | mddev->recovery_cp = MaxSector; | |
1053 | else { | |
1054 | if (sb->events_hi == sb->cp_events_hi && | |
1055 | sb->events_lo == sb->cp_events_lo) { | |
1056 | mddev->recovery_cp = sb->recovery_cp; | |
1057 | } else | |
1058 | mddev->recovery_cp = 0; | |
1059 | } | |
1060 | ||
1061 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1062 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1063 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1064 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1065 | ||
1066 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1067 | |
1068 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1069 | mddev->bitmap_info.file == NULL) |
1070 | mddev->bitmap_info.offset = | |
1071 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1072 | |
41158c7e | 1073 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1074 | /* Insist on good event counter while assembling, except |
1075 | * for spares (which don't need an event count) */ | |
1da177e4 | 1076 | ++ev1; |
be6800a7 N |
1077 | if (sb->disks[rdev->desc_nr].state & ( |
1078 | (1<<MD_DISK_SYNC) | (1 << MD_DISK_ACTIVE))) | |
1079 | if (ev1 < mddev->events) | |
1080 | return -EINVAL; | |
41158c7e N |
1081 | } else if (mddev->bitmap) { |
1082 | /* if adding to array with a bitmap, then we can accept an | |
1083 | * older device ... but not too old. | |
1084 | */ | |
41158c7e N |
1085 | if (ev1 < mddev->bitmap->events_cleared) |
1086 | return 0; | |
07d84d10 N |
1087 | } else { |
1088 | if (ev1 < mddev->events) | |
1089 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1090 | return 0; | |
1091 | } | |
41158c7e | 1092 | |
1da177e4 | 1093 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1094 | desc = sb->disks + rdev->desc_nr; |
1095 | ||
1096 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1097 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1098 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1099 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1100 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1101 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1102 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1103 | /* active but not in sync implies recovery up to | |
1104 | * reshape position. We don't know exactly where | |
1105 | * that is, so set to zero for now */ | |
1106 | if (mddev->minor_version >= 91) { | |
1107 | rdev->recovery_offset = 0; | |
1108 | rdev->raid_disk = desc->raid_disk; | |
1109 | } | |
1da177e4 | 1110 | } |
8ddf9efe N |
1111 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1112 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1113 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1114 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1115 | return 0; |
1116 | } | |
1117 | ||
1118 | /* | |
1119 | * sync_super for 0.90.0 | |
1120 | */ | |
1121 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1122 | { | |
1123 | mdp_super_t *sb; | |
1da177e4 LT |
1124 | mdk_rdev_t *rdev2; |
1125 | int next_spare = mddev->raid_disks; | |
19133a42 | 1126 | |
1da177e4 LT |
1127 | |
1128 | /* make rdev->sb match mddev data.. | |
1129 | * | |
1130 | * 1/ zero out disks | |
1131 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1132 | * 3/ any empty disks < next_spare become removed | |
1133 | * | |
1134 | * disks[0] gets initialised to REMOVED because | |
1135 | * we cannot be sure from other fields if it has | |
1136 | * been initialised or not. | |
1137 | */ | |
1138 | int i; | |
1139 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1140 | ||
61181565 N |
1141 | rdev->sb_size = MD_SB_BYTES; |
1142 | ||
1da177e4 LT |
1143 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
1144 | ||
1145 | memset(sb, 0, sizeof(*sb)); | |
1146 | ||
1147 | sb->md_magic = MD_SB_MAGIC; | |
1148 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1149 | sb->patch_version = mddev->patch_version; |
1150 | sb->gvalid_words = 0; /* ignored */ | |
1151 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1152 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1153 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1154 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1155 | ||
1156 | sb->ctime = mddev->ctime; | |
1157 | sb->level = mddev->level; | |
58c0fed4 | 1158 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1159 | sb->raid_disks = mddev->raid_disks; |
1160 | sb->md_minor = mddev->md_minor; | |
e691063a | 1161 | sb->not_persistent = 0; |
1da177e4 LT |
1162 | sb->utime = mddev->utime; |
1163 | sb->state = 0; | |
1164 | sb->events_hi = (mddev->events>>32); | |
1165 | sb->events_lo = (u32)mddev->events; | |
1166 | ||
f6705578 N |
1167 | if (mddev->reshape_position == MaxSector) |
1168 | sb->minor_version = 90; | |
1169 | else { | |
1170 | sb->minor_version = 91; | |
1171 | sb->reshape_position = mddev->reshape_position; | |
1172 | sb->new_level = mddev->new_level; | |
1173 | sb->delta_disks = mddev->delta_disks; | |
1174 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1175 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1176 | } |
1177 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1178 | if (mddev->in_sync) |
1179 | { | |
1180 | sb->recovery_cp = mddev->recovery_cp; | |
1181 | sb->cp_events_hi = (mddev->events>>32); | |
1182 | sb->cp_events_lo = (u32)mddev->events; | |
1183 | if (mddev->recovery_cp == MaxSector) | |
1184 | sb->state = (1<< MD_SB_CLEAN); | |
1185 | } else | |
1186 | sb->recovery_cp = 0; | |
1187 | ||
1188 | sb->layout = mddev->layout; | |
9d8f0363 | 1189 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1190 | |
c3d9714e | 1191 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1192 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1193 | ||
1da177e4 | 1194 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1195 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1196 | mdp_disk_t *d; |
86e6ffdd | 1197 | int desc_nr; |
0261cd9f N |
1198 | int is_active = test_bit(In_sync, &rdev2->flags); |
1199 | ||
1200 | if (rdev2->raid_disk >= 0 && | |
1201 | sb->minor_version >= 91) | |
1202 | /* we have nowhere to store the recovery_offset, | |
1203 | * but if it is not below the reshape_position, | |
1204 | * we can piggy-back on that. | |
1205 | */ | |
1206 | is_active = 1; | |
1207 | if (rdev2->raid_disk < 0 || | |
1208 | test_bit(Faulty, &rdev2->flags)) | |
1209 | is_active = 0; | |
1210 | if (is_active) | |
86e6ffdd | 1211 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1212 | else |
86e6ffdd | 1213 | desc_nr = next_spare++; |
19133a42 | 1214 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1215 | d = &sb->disks[rdev2->desc_nr]; |
1216 | nr_disks++; | |
1217 | d->number = rdev2->desc_nr; | |
1218 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1219 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1220 | if (is_active) |
1da177e4 LT |
1221 | d->raid_disk = rdev2->raid_disk; |
1222 | else | |
1223 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1224 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1225 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1226 | else if (is_active) { |
1da177e4 | 1227 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1228 | if (test_bit(In_sync, &rdev2->flags)) |
1229 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1230 | active++; |
1231 | working++; | |
1232 | } else { | |
1233 | d->state = 0; | |
1234 | spare++; | |
1235 | working++; | |
1236 | } | |
8ddf9efe N |
1237 | if (test_bit(WriteMostly, &rdev2->flags)) |
1238 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1239 | } |
1da177e4 LT |
1240 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1241 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1242 | mdp_disk_t *d = &sb->disks[i]; | |
1243 | if (d->state == 0 && d->number == 0) { | |
1244 | d->number = i; | |
1245 | d->raid_disk = i; | |
1246 | d->state = (1<<MD_DISK_REMOVED); | |
1247 | d->state |= (1<<MD_DISK_FAULTY); | |
1248 | failed++; | |
1249 | } | |
1250 | } | |
1251 | sb->nr_disks = nr_disks; | |
1252 | sb->active_disks = active; | |
1253 | sb->working_disks = working; | |
1254 | sb->failed_disks = failed; | |
1255 | sb->spare_disks = spare; | |
1256 | ||
1257 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1258 | sb->sb_csum = calc_sb_csum(sb); | |
1259 | } | |
1260 | ||
0cd17fec CW |
1261 | /* |
1262 | * rdev_size_change for 0.90.0 | |
1263 | */ | |
1264 | static unsigned long long | |
15f4a5fd | 1265 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1266 | { |
58c0fed4 | 1267 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1268 | return 0; /* component must fit device */ |
c3d9714e | 1269 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1270 | return 0; /* can't move bitmap */ |
0f420358 | 1271 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1272 | if (!num_sectors || num_sectors > rdev->sb_start) |
1273 | num_sectors = rdev->sb_start; | |
0f420358 | 1274 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1275 | rdev->sb_page); |
1276 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1277 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1278 | } |
1279 | ||
1280 | ||
1da177e4 LT |
1281 | /* |
1282 | * version 1 superblock | |
1283 | */ | |
1284 | ||
1c05b4bc | 1285 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1286 | { |
1c05b4bc N |
1287 | __le32 disk_csum; |
1288 | u32 csum; | |
1da177e4 LT |
1289 | unsigned long long newcsum; |
1290 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1291 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1292 | int i; |
1293 | ||
1294 | disk_csum = sb->sb_csum; | |
1295 | sb->sb_csum = 0; | |
1296 | newcsum = 0; | |
1297 | for (i=0; size>=4; size -= 4 ) | |
1298 | newcsum += le32_to_cpu(*isuper++); | |
1299 | ||
1300 | if (size == 2) | |
1c05b4bc | 1301 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1302 | |
1303 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1304 | sb->sb_csum = disk_csum; | |
1305 | return cpu_to_le32(csum); | |
1306 | } | |
1307 | ||
1308 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1309 | { | |
1310 | struct mdp_superblock_1 *sb; | |
1311 | int ret; | |
0f420358 | 1312 | sector_t sb_start; |
1da177e4 | 1313 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1314 | int bmask; |
1da177e4 LT |
1315 | |
1316 | /* | |
0f420358 | 1317 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1318 | * It is always aligned to a 4K boundary and |
1319 | * depeding on minor_version, it can be: | |
1320 | * 0: At least 8K, but less than 12K, from end of device | |
1321 | * 1: At start of device | |
1322 | * 2: 4K from start of device. | |
1323 | */ | |
1324 | switch(minor_version) { | |
1325 | case 0: | |
0f420358 AN |
1326 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1327 | sb_start -= 8*2; | |
1328 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1329 | break; |
1330 | case 1: | |
0f420358 | 1331 | sb_start = 0; |
1da177e4 LT |
1332 | break; |
1333 | case 2: | |
0f420358 | 1334 | sb_start = 8; |
1da177e4 LT |
1335 | break; |
1336 | default: | |
1337 | return -EINVAL; | |
1338 | } | |
0f420358 | 1339 | rdev->sb_start = sb_start; |
1da177e4 | 1340 | |
0002b271 N |
1341 | /* superblock is rarely larger than 1K, but it can be larger, |
1342 | * and it is safe to read 4k, so we do that | |
1343 | */ | |
1344 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1345 | if (ret) return ret; |
1346 | ||
1347 | ||
1348 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1349 | ||
1350 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1351 | sb->major_version != cpu_to_le32(1) || | |
1352 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1353 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1354 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1355 | return -EINVAL; |
1356 | ||
1357 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1358 | printk("md: invalid superblock checksum on %s\n", | |
1359 | bdevname(rdev->bdev,b)); | |
1360 | return -EINVAL; | |
1361 | } | |
1362 | if (le64_to_cpu(sb->data_size) < 10) { | |
1363 | printk("md: data_size too small on %s\n", | |
1364 | bdevname(rdev->bdev,b)); | |
1365 | return -EINVAL; | |
1366 | } | |
e11e93fa | 1367 | |
1da177e4 LT |
1368 | rdev->preferred_minor = 0xffff; |
1369 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1370 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1371 | |
0002b271 | 1372 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1373 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1374 | if (rdev->sb_size & bmask) |
a1801f85 N |
1375 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1376 | ||
1377 | if (minor_version | |
0f420358 | 1378 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1379 | return -EINVAL; |
0002b271 | 1380 | |
31b65a0d N |
1381 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1382 | rdev->desc_nr = -1; | |
1383 | else | |
1384 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1385 | ||
9a7b2b0f | 1386 | if (!refdev) { |
8ed75463 | 1387 | ret = 1; |
9a7b2b0f | 1388 | } else { |
1da177e4 LT |
1389 | __u64 ev1, ev2; |
1390 | struct mdp_superblock_1 *refsb = | |
1391 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1392 | ||
1393 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1394 | sb->level != refsb->level || | |
1395 | sb->layout != refsb->layout || | |
1396 | sb->chunksize != refsb->chunksize) { | |
1397 | printk(KERN_WARNING "md: %s has strangely different" | |
1398 | " superblock to %s\n", | |
1399 | bdevname(rdev->bdev,b), | |
1400 | bdevname(refdev->bdev,b2)); | |
1401 | return -EINVAL; | |
1402 | } | |
1403 | ev1 = le64_to_cpu(sb->events); | |
1404 | ev2 = le64_to_cpu(refsb->events); | |
1405 | ||
1406 | if (ev1 > ev2) | |
8ed75463 N |
1407 | ret = 1; |
1408 | else | |
1409 | ret = 0; | |
1da177e4 | 1410 | } |
a1801f85 | 1411 | if (minor_version) |
dd8ac336 AN |
1412 | rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - |
1413 | le64_to_cpu(sb->data_offset); | |
1da177e4 | 1414 | else |
dd8ac336 AN |
1415 | rdev->sectors = rdev->sb_start; |
1416 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1417 | return -EINVAL; |
dd8ac336 | 1418 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1419 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1420 | return -EINVAL; |
8ed75463 | 1421 | return ret; |
1da177e4 LT |
1422 | } |
1423 | ||
1424 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1425 | { | |
1426 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1427 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1428 | |
41158c7e | 1429 | rdev->raid_disk = -1; |
c5d79adb N |
1430 | clear_bit(Faulty, &rdev->flags); |
1431 | clear_bit(In_sync, &rdev->flags); | |
1432 | clear_bit(WriteMostly, &rdev->flags); | |
1433 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1434 | ||
1da177e4 LT |
1435 | if (mddev->raid_disks == 0) { |
1436 | mddev->major_version = 1; | |
1437 | mddev->patch_version = 0; | |
e691063a | 1438 | mddev->external = 0; |
9d8f0363 | 1439 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1440 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1441 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1442 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1443 | mddev->clevel[0] = 0; |
1da177e4 LT |
1444 | mddev->layout = le32_to_cpu(sb->layout); |
1445 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1446 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1447 | mddev->events = ev1; |
c3d9714e N |
1448 | mddev->bitmap_info.offset = 0; |
1449 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1450 | |
1451 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1452 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1453 | ||
1454 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1455 | |
71c0805c | 1456 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1457 | mddev->bitmap_info.file == NULL ) |
1458 | mddev->bitmap_info.offset = | |
1459 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1460 | |
f6705578 N |
1461 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1462 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1463 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1464 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1465 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1466 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1467 | } else { |
1468 | mddev->reshape_position = MaxSector; | |
1469 | mddev->delta_disks = 0; | |
1470 | mddev->new_level = mddev->level; | |
1471 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1472 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1473 | } |
1474 | ||
41158c7e | 1475 | } else if (mddev->pers == NULL) { |
be6800a7 N |
1476 | /* Insist of good event counter while assembling, except for |
1477 | * spares (which don't need an event count) */ | |
1da177e4 | 1478 | ++ev1; |
be6800a7 N |
1479 | if (rdev->desc_nr >= 0 && |
1480 | rdev->desc_nr < le32_to_cpu(sb->max_dev) && | |
1481 | le16_to_cpu(sb->dev_roles[rdev->desc_nr]) < 0xfffe) | |
1482 | if (ev1 < mddev->events) | |
1483 | return -EINVAL; | |
41158c7e N |
1484 | } else if (mddev->bitmap) { |
1485 | /* If adding to array with a bitmap, then we can accept an | |
1486 | * older device, but not too old. | |
1487 | */ | |
41158c7e N |
1488 | if (ev1 < mddev->bitmap->events_cleared) |
1489 | return 0; | |
07d84d10 N |
1490 | } else { |
1491 | if (ev1 < mddev->events) | |
1492 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1493 | return 0; | |
1494 | } | |
1da177e4 LT |
1495 | if (mddev->level != LEVEL_MULTIPATH) { |
1496 | int role; | |
3673f305 N |
1497 | if (rdev->desc_nr < 0 || |
1498 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1499 | role = 0xffff; | |
1500 | rdev->desc_nr = -1; | |
1501 | } else | |
1502 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1503 | switch(role) { |
1504 | case 0xffff: /* spare */ | |
1da177e4 LT |
1505 | break; |
1506 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1507 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1508 | break; |
1509 | default: | |
5fd6c1dc N |
1510 | if ((le32_to_cpu(sb->feature_map) & |
1511 | MD_FEATURE_RECOVERY_OFFSET)) | |
1512 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1513 | else | |
1514 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1515 | rdev->raid_disk = role; |
1516 | break; | |
1517 | } | |
8ddf9efe N |
1518 | if (sb->devflags & WriteMostly1) |
1519 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1520 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1521 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1522 | |
1da177e4 LT |
1523 | return 0; |
1524 | } | |
1525 | ||
1526 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1527 | { | |
1528 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1529 | mdk_rdev_t *rdev2; |
1530 | int max_dev, i; | |
1531 | /* make rdev->sb match mddev and rdev data. */ | |
1532 | ||
1533 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1534 | ||
1535 | sb->feature_map = 0; | |
1536 | sb->pad0 = 0; | |
5fd6c1dc | 1537 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1538 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1539 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1540 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1541 | ||
1542 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1543 | sb->events = cpu_to_le64(mddev->events); | |
1544 | if (mddev->in_sync) | |
1545 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1546 | else | |
1547 | sb->resync_offset = cpu_to_le64(0); | |
1548 | ||
1c05b4bc | 1549 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1550 | |
f0ca340c | 1551 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1552 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1553 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1554 | sb->level = cpu_to_le32(mddev->level); |
1555 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1556 | |
c3d9714e N |
1557 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1558 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1559 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1560 | } |
5fd6c1dc N |
1561 | |
1562 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1563 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1564 | sb->feature_map |= |
1565 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1566 | sb->recovery_offset = | |
1567 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1568 | } |
1569 | ||
f6705578 N |
1570 | if (mddev->reshape_position != MaxSector) { |
1571 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1572 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1573 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1574 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1575 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1576 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1577 | } |
a654b9d8 | 1578 | |
1da177e4 | 1579 | max_dev = 0; |
159ec1fc | 1580 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1581 | if (rdev2->desc_nr+1 > max_dev) |
1582 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1583 | |
70471daf N |
1584 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1585 | int bmask; | |
a778b73f | 1586 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1587 | rdev->sb_size = max_dev * 2 + 256; |
1588 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1589 | if (rdev->sb_size & bmask) | |
1590 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
1591 | } | |
1da177e4 LT |
1592 | for (i=0; i<max_dev;i++) |
1593 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1594 | ||
159ec1fc | 1595 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1596 | i = rdev2->desc_nr; |
b2d444d7 | 1597 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1598 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1599 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1600 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1601 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1602 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1603 | else |
1604 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1605 | } | |
1606 | ||
1da177e4 LT |
1607 | sb->sb_csum = calc_sb_1_csum(sb); |
1608 | } | |
1609 | ||
0cd17fec | 1610 | static unsigned long long |
15f4a5fd | 1611 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1612 | { |
1613 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1614 | sector_t max_sectors; |
58c0fed4 | 1615 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1616 | return 0; /* component must fit device */ |
0f420358 | 1617 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1618 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1619 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1620 | max_sectors -= rdev->data_offset; | |
1621 | if (!num_sectors || num_sectors > max_sectors) | |
1622 | num_sectors = max_sectors; | |
c3d9714e | 1623 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1624 | /* minor version 0 with bitmap we can't move */ |
1625 | return 0; | |
1626 | } else { | |
1627 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1628 | sector_t sb_start; |
1629 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1630 | sb_start &= ~(sector_t)(4*2 - 1); | |
dd8ac336 | 1631 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1632 | if (!num_sectors || num_sectors > max_sectors) |
1633 | num_sectors = max_sectors; | |
0f420358 | 1634 | rdev->sb_start = sb_start; |
0cd17fec CW |
1635 | } |
1636 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1637 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1638 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1639 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1640 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1641 | rdev->sb_page); |
1642 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1643 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1644 | } |
1da177e4 | 1645 | |
75c96f85 | 1646 | static struct super_type super_types[] = { |
1da177e4 LT |
1647 | [0] = { |
1648 | .name = "0.90.0", | |
1649 | .owner = THIS_MODULE, | |
0cd17fec CW |
1650 | .load_super = super_90_load, |
1651 | .validate_super = super_90_validate, | |
1652 | .sync_super = super_90_sync, | |
1653 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1654 | }, |
1655 | [1] = { | |
1656 | .name = "md-1", | |
1657 | .owner = THIS_MODULE, | |
0cd17fec CW |
1658 | .load_super = super_1_load, |
1659 | .validate_super = super_1_validate, | |
1660 | .sync_super = super_1_sync, | |
1661 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1662 | }, |
1663 | }; | |
1da177e4 LT |
1664 | |
1665 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1666 | { | |
7dd5e7c3 | 1667 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1668 | |
4b80991c N |
1669 | rcu_read_lock(); |
1670 | rdev_for_each_rcu(rdev, mddev1) | |
1671 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1672 | if (rdev->bdev->bd_contains == |
4b80991c N |
1673 | rdev2->bdev->bd_contains) { |
1674 | rcu_read_unlock(); | |
7dd5e7c3 | 1675 | return 1; |
4b80991c N |
1676 | } |
1677 | rcu_read_unlock(); | |
1da177e4 LT |
1678 | return 0; |
1679 | } | |
1680 | ||
1681 | static LIST_HEAD(pending_raid_disks); | |
1682 | ||
ac5e7113 AN |
1683 | /* |
1684 | * Try to register data integrity profile for an mddev | |
1685 | * | |
1686 | * This is called when an array is started and after a disk has been kicked | |
1687 | * from the array. It only succeeds if all working and active component devices | |
1688 | * are integrity capable with matching profiles. | |
1689 | */ | |
1690 | int md_integrity_register(mddev_t *mddev) | |
1691 | { | |
1692 | mdk_rdev_t *rdev, *reference = NULL; | |
1693 | ||
1694 | if (list_empty(&mddev->disks)) | |
1695 | return 0; /* nothing to do */ | |
1696 | if (blk_get_integrity(mddev->gendisk)) | |
1697 | return 0; /* already registered */ | |
1698 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1699 | /* skip spares and non-functional disks */ | |
1700 | if (test_bit(Faulty, &rdev->flags)) | |
1701 | continue; | |
1702 | if (rdev->raid_disk < 0) | |
1703 | continue; | |
1704 | /* | |
1705 | * If at least one rdev is not integrity capable, we can not | |
1706 | * enable data integrity for the md device. | |
1707 | */ | |
1708 | if (!bdev_get_integrity(rdev->bdev)) | |
1709 | return -EINVAL; | |
1710 | if (!reference) { | |
1711 | /* Use the first rdev as the reference */ | |
1712 | reference = rdev; | |
1713 | continue; | |
1714 | } | |
1715 | /* does this rdev's profile match the reference profile? */ | |
1716 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1717 | rdev->bdev->bd_disk) < 0) | |
1718 | return -EINVAL; | |
1719 | } | |
1720 | /* | |
1721 | * All component devices are integrity capable and have matching | |
1722 | * profiles, register the common profile for the md device. | |
1723 | */ | |
1724 | if (blk_integrity_register(mddev->gendisk, | |
1725 | bdev_get_integrity(reference->bdev)) != 0) { | |
1726 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1727 | mdname(mddev)); | |
1728 | return -EINVAL; | |
1729 | } | |
1730 | printk(KERN_NOTICE "md: data integrity on %s enabled\n", | |
1731 | mdname(mddev)); | |
1732 | return 0; | |
1733 | } | |
1734 | EXPORT_SYMBOL(md_integrity_register); | |
1735 | ||
1736 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1737 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1738 | { |
3f9d99c1 | 1739 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1740 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1741 | |
ac5e7113 | 1742 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1743 | return; |
ac5e7113 | 1744 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1745 | return; |
ac5e7113 AN |
1746 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1747 | rdev->bdev->bd_disk) >= 0) | |
1748 | return; | |
1749 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1750 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1751 | } |
ac5e7113 | 1752 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1753 | |
1da177e4 LT |
1754 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1755 | { | |
7dd5e7c3 | 1756 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1757 | struct kobject *ko; |
1edf80d3 | 1758 | char *s; |
5e55e2f5 | 1759 | int err; |
1da177e4 LT |
1760 | |
1761 | if (rdev->mddev) { | |
1762 | MD_BUG(); | |
1763 | return -EINVAL; | |
1764 | } | |
11e2ede0 DW |
1765 | |
1766 | /* prevent duplicates */ | |
1767 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1768 | return -EEXIST; | |
1769 | ||
dd8ac336 AN |
1770 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1771 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1772 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1773 | if (mddev->pers) { |
1774 | /* Cannot change size, so fail | |
1775 | * If mddev->level <= 0, then we don't care | |
1776 | * about aligning sizes (e.g. linear) | |
1777 | */ | |
1778 | if (mddev->level > 0) | |
1779 | return -ENOSPC; | |
1780 | } else | |
dd8ac336 | 1781 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1782 | } |
1da177e4 LT |
1783 | |
1784 | /* Verify rdev->desc_nr is unique. | |
1785 | * If it is -1, assign a free number, else | |
1786 | * check number is not in use | |
1787 | */ | |
1788 | if (rdev->desc_nr < 0) { | |
1789 | int choice = 0; | |
1790 | if (mddev->pers) choice = mddev->raid_disks; | |
1791 | while (find_rdev_nr(mddev, choice)) | |
1792 | choice++; | |
1793 | rdev->desc_nr = choice; | |
1794 | } else { | |
1795 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1796 | return -EBUSY; | |
1797 | } | |
de01dfad N |
1798 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1799 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1800 | mdname(mddev), mddev->max_disks); | |
1801 | return -EBUSY; | |
1802 | } | |
19133a42 | 1803 | bdevname(rdev->bdev,b); |
649316b2 | 1804 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1805 | *s = '!'; |
649316b2 | 1806 | |
1da177e4 | 1807 | rdev->mddev = mddev; |
19133a42 | 1808 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1809 | |
b2d6db58 | 1810 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1811 | goto fail; |
86e6ffdd | 1812 | |
0762b8bd | 1813 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1814 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1815 | kobject_del(&rdev->kobj); | |
1816 | goto fail; | |
1817 | } | |
3ff195b0 | 1818 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, NULL, "state"); |
3c0ee63a | 1819 | |
4b80991c | 1820 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1821 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1822 | |
1823 | /* May as well allow recovery to be retried once */ | |
1824 | mddev->recovery_disabled = 0; | |
3f9d99c1 | 1825 | |
1da177e4 | 1826 | return 0; |
5e55e2f5 N |
1827 | |
1828 | fail: | |
1829 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1830 | b, mdname(mddev)); | |
1831 | return err; | |
1da177e4 LT |
1832 | } |
1833 | ||
177a99b2 | 1834 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1835 | { |
1836 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1837 | kobject_del(&rdev->kobj); | |
177a99b2 | 1838 | kobject_put(&rdev->kobj); |
5792a285 N |
1839 | } |
1840 | ||
1da177e4 LT |
1841 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1842 | { | |
1843 | char b[BDEVNAME_SIZE]; | |
1844 | if (!rdev->mddev) { | |
1845 | MD_BUG(); | |
1846 | return; | |
1847 | } | |
5463c790 | 1848 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1849 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1850 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1851 | rdev->mddev = NULL; | |
86e6ffdd | 1852 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1853 | sysfs_put(rdev->sysfs_state); |
1854 | rdev->sysfs_state = NULL; | |
5792a285 | 1855 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1856 | * writing to 'remove' to "dev/state". We also need |
1857 | * to delay it due to rcu usage. | |
5792a285 | 1858 | */ |
4b80991c | 1859 | synchronize_rcu(); |
177a99b2 N |
1860 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1861 | kobject_get(&rdev->kobj); | |
5792a285 | 1862 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1863 | } |
1864 | ||
1865 | /* | |
1866 | * prevent the device from being mounted, repartitioned or | |
1867 | * otherwise reused by a RAID array (or any other kernel | |
1868 | * subsystem), by bd_claiming the device. | |
1869 | */ | |
c5d79adb | 1870 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1871 | { |
1872 | int err = 0; | |
1873 | struct block_device *bdev; | |
1874 | char b[BDEVNAME_SIZE]; | |
1875 | ||
2e7b651d | 1876 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1877 | if (IS_ERR(bdev)) { |
1878 | printk(KERN_ERR "md: could not open %s.\n", | |
1879 | __bdevname(dev, b)); | |
1880 | return PTR_ERR(bdev); | |
1881 | } | |
c5d79adb | 1882 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1883 | if (err) { |
1884 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1885 | bdevname(bdev, b)); | |
9a1c3542 | 1886 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1887 | return err; |
1888 | } | |
c5d79adb N |
1889 | if (!shared) |
1890 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1891 | rdev->bdev = bdev; |
1892 | return err; | |
1893 | } | |
1894 | ||
1895 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1896 | { | |
1897 | struct block_device *bdev = rdev->bdev; | |
1898 | rdev->bdev = NULL; | |
1899 | if (!bdev) | |
1900 | MD_BUG(); | |
1901 | bd_release(bdev); | |
9a1c3542 | 1902 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1903 | } |
1904 | ||
1905 | void md_autodetect_dev(dev_t dev); | |
1906 | ||
1907 | static void export_rdev(mdk_rdev_t * rdev) | |
1908 | { | |
1909 | char b[BDEVNAME_SIZE]; | |
1910 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1911 | bdevname(rdev->bdev,b)); | |
1912 | if (rdev->mddev) | |
1913 | MD_BUG(); | |
1914 | free_disk_sb(rdev); | |
1da177e4 | 1915 | #ifndef MODULE |
d0fae18f N |
1916 | if (test_bit(AutoDetected, &rdev->flags)) |
1917 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1918 | #endif |
1919 | unlock_rdev(rdev); | |
86e6ffdd | 1920 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1921 | } |
1922 | ||
1923 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1924 | { | |
1925 | unbind_rdev_from_array(rdev); | |
1926 | export_rdev(rdev); | |
1927 | } | |
1928 | ||
1929 | static void export_array(mddev_t *mddev) | |
1930 | { | |
159ec1fc | 1931 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1932 | |
d089c6af | 1933 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1934 | if (!rdev->mddev) { |
1935 | MD_BUG(); | |
1936 | continue; | |
1937 | } | |
1938 | kick_rdev_from_array(rdev); | |
1939 | } | |
1940 | if (!list_empty(&mddev->disks)) | |
1941 | MD_BUG(); | |
1942 | mddev->raid_disks = 0; | |
1943 | mddev->major_version = 0; | |
1944 | } | |
1945 | ||
1946 | static void print_desc(mdp_disk_t *desc) | |
1947 | { | |
1948 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1949 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1950 | } | |
1951 | ||
cd2ac932 | 1952 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1953 | { |
1954 | int i; | |
1955 | ||
1956 | printk(KERN_INFO | |
1957 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1958 | sb->major_version, sb->minor_version, sb->patch_version, | |
1959 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1960 | sb->ctime); | |
1961 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1962 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1963 | sb->md_minor, sb->layout, sb->chunk_size); | |
1964 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1965 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1966 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1967 | sb->failed_disks, sb->spare_disks, | |
1968 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1969 | ||
1970 | printk(KERN_INFO); | |
1971 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1972 | mdp_disk_t *desc; | |
1973 | ||
1974 | desc = sb->disks + i; | |
1975 | if (desc->number || desc->major || desc->minor || | |
1976 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1977 | printk(" D %2d: ", i); | |
1978 | print_desc(desc); | |
1979 | } | |
1980 | } | |
1981 | printk(KERN_INFO "md: THIS: "); | |
1982 | print_desc(&sb->this_disk); | |
cd2ac932 | 1983 | } |
1da177e4 | 1984 | |
cd2ac932 CR |
1985 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1986 | { | |
1987 | __u8 *uuid; | |
1988 | ||
1989 | uuid = sb->set_uuid; | |
ad361c98 | 1990 | printk(KERN_INFO |
7b75c2f8 | 1991 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%pU>\n" |
ad361c98 | 1992 | "md: Name: \"%s\" CT:%llu\n", |
cd2ac932 CR |
1993 | le32_to_cpu(sb->major_version), |
1994 | le32_to_cpu(sb->feature_map), | |
7b75c2f8 | 1995 | uuid, |
cd2ac932 CR |
1996 | sb->set_name, |
1997 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1998 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1999 | ||
2000 | uuid = sb->device_uuid; | |
ad361c98 JP |
2001 | printk(KERN_INFO |
2002 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 2003 | " RO:%llu\n" |
7b75c2f8 | 2004 | "md: Dev:%08x UUID: %pU\n" |
ad361c98 JP |
2005 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" |
2006 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
2007 | le32_to_cpu(sb->level), |
2008 | (unsigned long long)le64_to_cpu(sb->size), | |
2009 | le32_to_cpu(sb->raid_disks), | |
2010 | le32_to_cpu(sb->layout), | |
2011 | le32_to_cpu(sb->chunksize), | |
2012 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
2013 | (unsigned long long)le64_to_cpu(sb->data_size), | |
2014 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
2015 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
2016 | le32_to_cpu(sb->dev_number), | |
7b75c2f8 | 2017 | uuid, |
cd2ac932 CR |
2018 | sb->devflags, |
2019 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
2020 | (unsigned long long)le64_to_cpu(sb->events), | |
2021 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
2022 | le32_to_cpu(sb->sb_csum), | |
2023 | le32_to_cpu(sb->max_dev) | |
2024 | ); | |
1da177e4 LT |
2025 | } |
2026 | ||
cd2ac932 | 2027 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
2028 | { |
2029 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
2030 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
2031 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
2032 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
2033 | rdev->desc_nr); | |
1da177e4 | 2034 | if (rdev->sb_loaded) { |
cd2ac932 CR |
2035 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
2036 | switch (major_version) { | |
2037 | case 0: | |
2038 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
2039 | break; | |
2040 | case 1: | |
2041 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
2042 | break; | |
2043 | } | |
1da177e4 LT |
2044 | } else |
2045 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2046 | } | |
2047 | ||
5e56341d | 2048 | static void md_print_devices(void) |
1da177e4 | 2049 | { |
159ec1fc | 2050 | struct list_head *tmp; |
1da177e4 LT |
2051 | mdk_rdev_t *rdev; |
2052 | mddev_t *mddev; | |
2053 | char b[BDEVNAME_SIZE]; | |
2054 | ||
2055 | printk("\n"); | |
2056 | printk("md: **********************************\n"); | |
2057 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2058 | printk("md: **********************************\n"); | |
29ac4aa3 | 2059 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2060 | |
32a7627c N |
2061 | if (mddev->bitmap) |
2062 | bitmap_print_sb(mddev->bitmap); | |
2063 | else | |
2064 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2065 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2066 | printk("<%s>", bdevname(rdev->bdev,b)); |
2067 | printk("\n"); | |
2068 | ||
159ec1fc | 2069 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2070 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2071 | } |
2072 | printk("md: **********************************\n"); | |
2073 | printk("\n"); | |
2074 | } | |
2075 | ||
2076 | ||
42543769 | 2077 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2078 | { |
42543769 N |
2079 | /* Update each superblock (in-memory image), but |
2080 | * if we are allowed to, skip spares which already | |
2081 | * have the right event counter, or have one earlier | |
2082 | * (which would mean they aren't being marked as dirty | |
2083 | * with the rest of the array) | |
2084 | */ | |
1da177e4 | 2085 | mdk_rdev_t *rdev; |
1da177e4 | 2086 | |
5e865106 N |
2087 | /* First make sure individual recovery_offsets are correct */ |
2088 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2089 | if (rdev->raid_disk >= 0 && | |
70fffd0b | 2090 | mddev->delta_disks >= 0 && |
5e865106 N |
2091 | !test_bit(In_sync, &rdev->flags) && |
2092 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2093 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2094 | ||
2095 | } | |
159ec1fc | 2096 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2097 | if (rdev->sb_events == mddev->events || |
2098 | (nospares && | |
2099 | rdev->raid_disk < 0 && | |
42543769 N |
2100 | rdev->sb_events+1 == mddev->events)) { |
2101 | /* Don't update this superblock */ | |
2102 | rdev->sb_loaded = 2; | |
2103 | } else { | |
2104 | super_types[mddev->major_version]. | |
2105 | sync_super(mddev, rdev); | |
2106 | rdev->sb_loaded = 1; | |
2107 | } | |
1da177e4 LT |
2108 | } |
2109 | } | |
2110 | ||
850b2b42 | 2111 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2112 | { |
1da177e4 | 2113 | mdk_rdev_t *rdev; |
06d91a5f | 2114 | int sync_req; |
42543769 | 2115 | int nospares = 0; |
1da177e4 | 2116 | |
1b57f132 | 2117 | mddev->utime = get_seconds(); |
8377bc80 N |
2118 | if (mddev->external) |
2119 | return; | |
1da177e4 | 2120 | repeat: |
a9701a30 | 2121 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2122 | |
850b2b42 N |
2123 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2124 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
2125 | force_change = 1; | |
2126 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2127 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2128 | * though if events isn't the right even/odd, we will have to do | |
2129 | * spares after all | |
2130 | */ | |
2131 | nospares = 1; | |
2132 | if (force_change) | |
2133 | nospares = 0; | |
2134 | if (mddev->degraded) | |
84692195 N |
2135 | /* If the array is degraded, then skipping spares is both |
2136 | * dangerous and fairly pointless. | |
2137 | * Dangerous because a device that was removed from the array | |
2138 | * might have a event_count that still looks up-to-date, | |
2139 | * so it can be re-added without a resync. | |
2140 | * Pointless because if there are any spares to skip, | |
2141 | * then a recovery will happen and soon that array won't | |
2142 | * be degraded any more and the spare can go back to sleep then. | |
2143 | */ | |
850b2b42 | 2144 | nospares = 0; |
84692195 | 2145 | |
06d91a5f | 2146 | sync_req = mddev->in_sync; |
42543769 N |
2147 | |
2148 | /* If this is just a dirty<->clean transition, and the array is clean | |
2149 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2150 | if (nospares |
42543769 | 2151 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
a8707c08 N |
2152 | && mddev->can_decrease_events |
2153 | && mddev->events != 1) { | |
42543769 | 2154 | mddev->events--; |
a8707c08 N |
2155 | mddev->can_decrease_events = 0; |
2156 | } else { | |
42543769 N |
2157 | /* otherwise we have to go forward and ... */ |
2158 | mddev->events ++; | |
a8707c08 | 2159 | mddev->can_decrease_events = nospares; |
42543769 | 2160 | } |
1da177e4 LT |
2161 | |
2162 | if (!mddev->events) { | |
2163 | /* | |
2164 | * oops, this 64-bit counter should never wrap. | |
2165 | * Either we are in around ~1 trillion A.C., assuming | |
2166 | * 1 reboot per second, or we have a bug: | |
2167 | */ | |
2168 | MD_BUG(); | |
2169 | mddev->events --; | |
2170 | } | |
1da177e4 LT |
2171 | |
2172 | /* | |
2173 | * do not write anything to disk if using | |
2174 | * nonpersistent superblocks | |
2175 | */ | |
06d91a5f | 2176 | if (!mddev->persistent) { |
e691063a N |
2177 | if (!mddev->external) |
2178 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
2179 | ||
a9701a30 | 2180 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2181 | wake_up(&mddev->sb_wait); |
1da177e4 | 2182 | return; |
06d91a5f | 2183 | } |
e691063a | 2184 | sync_sbs(mddev, nospares); |
a9701a30 | 2185 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2186 | |
2187 | dprintk(KERN_INFO | |
2188 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2189 | mdname(mddev),mddev->in_sync); | |
2190 | ||
4ad13663 | 2191 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2192 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2193 | char b[BDEVNAME_SIZE]; |
2194 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2195 | if (rdev->sb_loaded != 1) |
2196 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2197 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2198 | dprintk("(skipping faulty "); |
2199 | ||
2200 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2201 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2202 | md_super_write(mddev,rdev, |
0f420358 | 2203 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2204 | rdev->sb_page); |
2205 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2206 | bdevname(rdev->bdev,b), | |
0f420358 | 2207 | (unsigned long long)rdev->sb_start); |
42543769 | 2208 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2209 | |
1da177e4 LT |
2210 | } else |
2211 | dprintk(")\n"); | |
7bfa19f2 | 2212 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2213 | /* only need to write one superblock... */ |
2214 | break; | |
2215 | } | |
a9701a30 | 2216 | md_super_wait(mddev); |
850b2b42 | 2217 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2218 | |
a9701a30 | 2219 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2220 | if (mddev->in_sync != sync_req || |
2221 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2222 | /* have to write it out again */ |
a9701a30 | 2223 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2224 | goto repeat; |
2225 | } | |
850b2b42 | 2226 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2227 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2228 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2229 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2230 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2231 | |
1da177e4 LT |
2232 | } |
2233 | ||
7f6ce769 | 2234 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2235 | * We want to accept with case. For this we use cmd_match. |
2236 | */ | |
2237 | static int cmd_match(const char *cmd, const char *str) | |
2238 | { | |
2239 | /* See if cmd, written into a sysfs file, matches | |
2240 | * str. They must either be the same, or cmd can | |
2241 | * have a trailing newline | |
2242 | */ | |
2243 | while (*cmd && *str && *cmd == *str) { | |
2244 | cmd++; | |
2245 | str++; | |
2246 | } | |
2247 | if (*cmd == '\n') | |
2248 | cmd++; | |
2249 | if (*str || *cmd) | |
2250 | return 0; | |
2251 | return 1; | |
2252 | } | |
2253 | ||
86e6ffdd N |
2254 | struct rdev_sysfs_entry { |
2255 | struct attribute attr; | |
2256 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2257 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2258 | }; | |
2259 | ||
2260 | static ssize_t | |
96de1e66 | 2261 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2262 | { |
2263 | char *sep = ""; | |
20a49ff6 | 2264 | size_t len = 0; |
86e6ffdd | 2265 | |
b2d444d7 | 2266 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2267 | len+= sprintf(page+len, "%sfaulty",sep); |
2268 | sep = ","; | |
2269 | } | |
b2d444d7 | 2270 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2271 | len += sprintf(page+len, "%sin_sync",sep); |
2272 | sep = ","; | |
2273 | } | |
f655675b N |
2274 | if (test_bit(WriteMostly, &rdev->flags)) { |
2275 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2276 | sep = ","; | |
2277 | } | |
6bfe0b49 DW |
2278 | if (test_bit(Blocked, &rdev->flags)) { |
2279 | len += sprintf(page+len, "%sblocked", sep); | |
2280 | sep = ","; | |
2281 | } | |
b2d444d7 N |
2282 | if (!test_bit(Faulty, &rdev->flags) && |
2283 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2284 | len += sprintf(page+len, "%sspare", sep); |
2285 | sep = ","; | |
2286 | } | |
2287 | return len+sprintf(page+len, "\n"); | |
2288 | } | |
2289 | ||
45dc2de1 N |
2290 | static ssize_t |
2291 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2292 | { | |
2293 | /* can write | |
2294 | * faulty - simulates and error | |
2295 | * remove - disconnects the device | |
f655675b N |
2296 | * writemostly - sets write_mostly |
2297 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2298 | * blocked - sets the Blocked flag |
2299 | * -blocked - clears the Blocked flag | |
6d56e278 | 2300 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2301 | */ |
2302 | int err = -EINVAL; | |
2303 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2304 | md_error(rdev->mddev, rdev); | |
2305 | err = 0; | |
2306 | } else if (cmd_match(buf, "remove")) { | |
2307 | if (rdev->raid_disk >= 0) | |
2308 | err = -EBUSY; | |
2309 | else { | |
2310 | mddev_t *mddev = rdev->mddev; | |
2311 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2312 | if (mddev->pers) |
2313 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2314 | md_new_event(mddev); |
2315 | err = 0; | |
2316 | } | |
f655675b N |
2317 | } else if (cmd_match(buf, "writemostly")) { |
2318 | set_bit(WriteMostly, &rdev->flags); | |
2319 | err = 0; | |
2320 | } else if (cmd_match(buf, "-writemostly")) { | |
2321 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2322 | err = 0; |
2323 | } else if (cmd_match(buf, "blocked")) { | |
2324 | set_bit(Blocked, &rdev->flags); | |
2325 | err = 0; | |
2326 | } else if (cmd_match(buf, "-blocked")) { | |
2327 | clear_bit(Blocked, &rdev->flags); | |
2328 | wake_up(&rdev->blocked_wait); | |
2329 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2330 | md_wakeup_thread(rdev->mddev->thread); | |
2331 | ||
6d56e278 N |
2332 | err = 0; |
2333 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2334 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2335 | err = 0; |
45dc2de1 | 2336 | } |
3c0ee63a N |
2337 | if (!err && rdev->sysfs_state) |
2338 | sysfs_notify_dirent(rdev->sysfs_state); | |
45dc2de1 N |
2339 | return err ? err : len; |
2340 | } | |
80ca3a44 N |
2341 | static struct rdev_sysfs_entry rdev_state = |
2342 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2343 | |
4dbcdc75 N |
2344 | static ssize_t |
2345 | errors_show(mdk_rdev_t *rdev, char *page) | |
2346 | { | |
2347 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2348 | } | |
2349 | ||
2350 | static ssize_t | |
2351 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2352 | { | |
2353 | char *e; | |
2354 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2355 | if (*buf && (*e == 0 || *e == '\n')) { | |
2356 | atomic_set(&rdev->corrected_errors, n); | |
2357 | return len; | |
2358 | } | |
2359 | return -EINVAL; | |
2360 | } | |
2361 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2362 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2363 | |
014236d2 N |
2364 | static ssize_t |
2365 | slot_show(mdk_rdev_t *rdev, char *page) | |
2366 | { | |
2367 | if (rdev->raid_disk < 0) | |
2368 | return sprintf(page, "none\n"); | |
2369 | else | |
2370 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2371 | } | |
2372 | ||
2373 | static ssize_t | |
2374 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2375 | { | |
2376 | char *e; | |
c303da6d N |
2377 | int err; |
2378 | char nm[20]; | |
014236d2 N |
2379 | int slot = simple_strtoul(buf, &e, 10); |
2380 | if (strncmp(buf, "none", 4)==0) | |
2381 | slot = -1; | |
2382 | else if (e==buf || (*e && *e!= '\n')) | |
2383 | return -EINVAL; | |
6c2fce2e | 2384 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2385 | /* Setting 'slot' on an active array requires also |
2386 | * updating the 'rd%d' link, and communicating | |
2387 | * with the personality with ->hot_*_disk. | |
2388 | * For now we only support removing | |
2389 | * failed/spare devices. This normally happens automatically, | |
2390 | * but not when the metadata is externally managed. | |
2391 | */ | |
c303da6d N |
2392 | if (rdev->raid_disk == -1) |
2393 | return -EEXIST; | |
2394 | /* personality does all needed checks */ | |
2395 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2396 | return -EINVAL; | |
2397 | err = rdev->mddev->pers-> | |
2398 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2399 | if (err) | |
2400 | return err; | |
2401 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2402 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
b7103107 | 2403 | rdev->raid_disk = -1; |
c303da6d N |
2404 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); |
2405 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2406 | } else if (rdev->mddev->pers) { |
2407 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2408 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2409 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2410 | */ |
2411 | ||
2412 | if (rdev->raid_disk != -1) | |
2413 | return -EBUSY; | |
2414 | ||
2415 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2416 | return -EINVAL; | |
2417 | ||
159ec1fc | 2418 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2419 | if (rdev2->raid_disk == slot) |
2420 | return -EEXIST; | |
2421 | ||
2422 | rdev->raid_disk = slot; | |
2423 | if (test_bit(In_sync, &rdev->flags)) | |
2424 | rdev->saved_raid_disk = slot; | |
2425 | else | |
2426 | rdev->saved_raid_disk = -1; | |
2427 | err = rdev->mddev->pers-> | |
2428 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2429 | if (err) { |
6c2fce2e | 2430 | rdev->raid_disk = -1; |
6c2fce2e | 2431 | return err; |
52664732 | 2432 | } else |
3c0ee63a | 2433 | sysfs_notify_dirent(rdev->sysfs_state); |
6c2fce2e NB |
2434 | sprintf(nm, "rd%d", rdev->raid_disk); |
2435 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2436 | printk(KERN_WARNING | |
2437 | "md: cannot register " | |
2438 | "%s for %s\n", | |
2439 | nm, mdname(rdev->mddev)); | |
2440 | ||
2441 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2442 | } else { |
2443 | if (slot >= rdev->mddev->raid_disks) | |
2444 | return -ENOSPC; | |
2445 | rdev->raid_disk = slot; | |
2446 | /* assume it is working */ | |
c5d79adb N |
2447 | clear_bit(Faulty, &rdev->flags); |
2448 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2449 | set_bit(In_sync, &rdev->flags); |
3c0ee63a | 2450 | sysfs_notify_dirent(rdev->sysfs_state); |
c303da6d | 2451 | } |
014236d2 N |
2452 | return len; |
2453 | } | |
2454 | ||
2455 | ||
2456 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2457 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2458 | |
93c8cad0 N |
2459 | static ssize_t |
2460 | offset_show(mdk_rdev_t *rdev, char *page) | |
2461 | { | |
6961ece4 | 2462 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2463 | } |
2464 | ||
2465 | static ssize_t | |
2466 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2467 | { | |
2468 | char *e; | |
2469 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2470 | if (e==buf || (*e && *e != '\n')) | |
2471 | return -EINVAL; | |
8ed0a521 | 2472 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2473 | return -EBUSY; |
dd8ac336 | 2474 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2475 | /* Must set offset before size, so overlap checks |
2476 | * can be sane */ | |
2477 | return -EBUSY; | |
93c8cad0 N |
2478 | rdev->data_offset = offset; |
2479 | return len; | |
2480 | } | |
2481 | ||
2482 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2483 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2484 | |
83303b61 N |
2485 | static ssize_t |
2486 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2487 | { | |
dd8ac336 | 2488 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2489 | } |
2490 | ||
c5d79adb N |
2491 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2492 | { | |
2493 | /* check if two start/length pairs overlap */ | |
2494 | if (s1+l1 <= s2) | |
2495 | return 0; | |
2496 | if (s2+l2 <= s1) | |
2497 | return 0; | |
2498 | return 1; | |
2499 | } | |
2500 | ||
b522adcd DW |
2501 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2502 | { | |
2503 | unsigned long long blocks; | |
2504 | sector_t new; | |
2505 | ||
2506 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2507 | return -EINVAL; | |
2508 | ||
2509 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2510 | return -EINVAL; /* sector conversion overflow */ | |
2511 | ||
2512 | new = blocks * 2; | |
2513 | if (new != blocks * 2) | |
2514 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2515 | ||
2516 | *sectors = new; | |
2517 | return 0; | |
2518 | } | |
2519 | ||
83303b61 N |
2520 | static ssize_t |
2521 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2522 | { | |
27c529bb | 2523 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2524 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2525 | sector_t sectors; |
27c529bb | 2526 | |
b522adcd | 2527 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2528 | return -EINVAL; |
0cd17fec | 2529 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2530 | if (my_mddev->persistent) { |
dd8ac336 AN |
2531 | sectors = super_types[my_mddev->major_version]. |
2532 | rdev_size_change(rdev, sectors); | |
2533 | if (!sectors) | |
0cd17fec | 2534 | return -EBUSY; |
dd8ac336 AN |
2535 | } else if (!sectors) |
2536 | sectors = (rdev->bdev->bd_inode->i_size >> 9) - | |
2537 | rdev->data_offset; | |
0cd17fec | 2538 | } |
dd8ac336 | 2539 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2540 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2541 | |
dd8ac336 AN |
2542 | rdev->sectors = sectors; |
2543 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2544 | /* need to check that all other rdevs with the same ->bdev |
2545 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2546 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2547 | * we have to change it back, we will have the lock again. |
2548 | */ | |
2549 | mddev_t *mddev; | |
2550 | int overlap = 0; | |
159ec1fc | 2551 | struct list_head *tmp; |
c5d79adb | 2552 | |
27c529bb | 2553 | mddev_unlock(my_mddev); |
29ac4aa3 | 2554 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2555 | mdk_rdev_t *rdev2; |
2556 | ||
2557 | mddev_lock(mddev); | |
159ec1fc | 2558 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2559 | if (test_bit(AllReserved, &rdev2->flags) || |
2560 | (rdev->bdev == rdev2->bdev && | |
2561 | rdev != rdev2 && | |
dd8ac336 | 2562 | overlaps(rdev->data_offset, rdev->sectors, |
d07bd3bc | 2563 | rdev2->data_offset, |
dd8ac336 | 2564 | rdev2->sectors))) { |
c5d79adb N |
2565 | overlap = 1; |
2566 | break; | |
2567 | } | |
2568 | mddev_unlock(mddev); | |
2569 | if (overlap) { | |
2570 | mddev_put(mddev); | |
2571 | break; | |
2572 | } | |
2573 | } | |
27c529bb | 2574 | mddev_lock(my_mddev); |
c5d79adb N |
2575 | if (overlap) { |
2576 | /* Someone else could have slipped in a size | |
2577 | * change here, but doing so is just silly. | |
dd8ac336 | 2578 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2579 | * safe, and trust userspace not to race with |
2580 | * itself | |
2581 | */ | |
dd8ac336 | 2582 | rdev->sectors = oldsectors; |
c5d79adb N |
2583 | return -EBUSY; |
2584 | } | |
2585 | } | |
83303b61 N |
2586 | return len; |
2587 | } | |
2588 | ||
2589 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2590 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2591 | |
06e3c817 DW |
2592 | |
2593 | static ssize_t recovery_start_show(mdk_rdev_t *rdev, char *page) | |
2594 | { | |
2595 | unsigned long long recovery_start = rdev->recovery_offset; | |
2596 | ||
2597 | if (test_bit(In_sync, &rdev->flags) || | |
2598 | recovery_start == MaxSector) | |
2599 | return sprintf(page, "none\n"); | |
2600 | ||
2601 | return sprintf(page, "%llu\n", recovery_start); | |
2602 | } | |
2603 | ||
2604 | static ssize_t recovery_start_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2605 | { | |
2606 | unsigned long long recovery_start; | |
2607 | ||
2608 | if (cmd_match(buf, "none")) | |
2609 | recovery_start = MaxSector; | |
2610 | else if (strict_strtoull(buf, 10, &recovery_start)) | |
2611 | return -EINVAL; | |
2612 | ||
2613 | if (rdev->mddev->pers && | |
2614 | rdev->raid_disk >= 0) | |
2615 | return -EBUSY; | |
2616 | ||
2617 | rdev->recovery_offset = recovery_start; | |
2618 | if (recovery_start == MaxSector) | |
2619 | set_bit(In_sync, &rdev->flags); | |
2620 | else | |
2621 | clear_bit(In_sync, &rdev->flags); | |
2622 | return len; | |
2623 | } | |
2624 | ||
2625 | static struct rdev_sysfs_entry rdev_recovery_start = | |
2626 | __ATTR(recovery_start, S_IRUGO|S_IWUSR, recovery_start_show, recovery_start_store); | |
2627 | ||
86e6ffdd N |
2628 | static struct attribute *rdev_default_attrs[] = { |
2629 | &rdev_state.attr, | |
4dbcdc75 | 2630 | &rdev_errors.attr, |
014236d2 | 2631 | &rdev_slot.attr, |
93c8cad0 | 2632 | &rdev_offset.attr, |
83303b61 | 2633 | &rdev_size.attr, |
06e3c817 | 2634 | &rdev_recovery_start.attr, |
86e6ffdd N |
2635 | NULL, |
2636 | }; | |
2637 | static ssize_t | |
2638 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2639 | { | |
2640 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2641 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2642 | mddev_t *mddev = rdev->mddev; |
2643 | ssize_t rv; | |
86e6ffdd N |
2644 | |
2645 | if (!entry->show) | |
2646 | return -EIO; | |
27c529bb N |
2647 | |
2648 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2649 | if (!rv) { | |
2650 | if (rdev->mddev == NULL) | |
2651 | rv = -EBUSY; | |
2652 | else | |
2653 | rv = entry->show(rdev, page); | |
2654 | mddev_unlock(mddev); | |
2655 | } | |
2656 | return rv; | |
86e6ffdd N |
2657 | } |
2658 | ||
2659 | static ssize_t | |
2660 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2661 | const char *page, size_t length) | |
2662 | { | |
2663 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2664 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2665 | ssize_t rv; |
2666 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2667 | |
2668 | if (!entry->store) | |
2669 | return -EIO; | |
67463acb N |
2670 | if (!capable(CAP_SYS_ADMIN)) |
2671 | return -EACCES; | |
27c529bb | 2672 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2673 | if (!rv) { |
27c529bb N |
2674 | if (rdev->mddev == NULL) |
2675 | rv = -EBUSY; | |
2676 | else | |
2677 | rv = entry->store(rdev, page, length); | |
6a51830e | 2678 | mddev_unlock(mddev); |
ca388059 N |
2679 | } |
2680 | return rv; | |
86e6ffdd N |
2681 | } |
2682 | ||
2683 | static void rdev_free(struct kobject *ko) | |
2684 | { | |
2685 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2686 | kfree(rdev); | |
2687 | } | |
52cf25d0 | 2688 | static const struct sysfs_ops rdev_sysfs_ops = { |
86e6ffdd N |
2689 | .show = rdev_attr_show, |
2690 | .store = rdev_attr_store, | |
2691 | }; | |
2692 | static struct kobj_type rdev_ktype = { | |
2693 | .release = rdev_free, | |
2694 | .sysfs_ops = &rdev_sysfs_ops, | |
2695 | .default_attrs = rdev_default_attrs, | |
2696 | }; | |
2697 | ||
1da177e4 LT |
2698 | /* |
2699 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2700 | * | |
2701 | * mark the device faulty if: | |
2702 | * | |
2703 | * - the device is nonexistent (zero size) | |
2704 | * - the device has no valid superblock | |
2705 | * | |
2706 | * a faulty rdev _never_ has rdev->sb set. | |
2707 | */ | |
2708 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2709 | { | |
2710 | char b[BDEVNAME_SIZE]; | |
2711 | int err; | |
2712 | mdk_rdev_t *rdev; | |
2713 | sector_t size; | |
2714 | ||
9ffae0cf | 2715 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2716 | if (!rdev) { |
2717 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2718 | return ERR_PTR(-ENOMEM); | |
2719 | } | |
1da177e4 LT |
2720 | |
2721 | if ((err = alloc_disk_sb(rdev))) | |
2722 | goto abort_free; | |
2723 | ||
c5d79adb | 2724 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2725 | if (err) |
2726 | goto abort_free; | |
2727 | ||
f9cb074b | 2728 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2729 | |
1da177e4 | 2730 | rdev->desc_nr = -1; |
2b6e8459 | 2731 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2732 | rdev->raid_disk = -1; |
b2d444d7 | 2733 | rdev->flags = 0; |
1da177e4 | 2734 | rdev->data_offset = 0; |
42543769 | 2735 | rdev->sb_events = 0; |
1e50915f RB |
2736 | rdev->last_read_error.tv_sec = 0; |
2737 | rdev->last_read_error.tv_nsec = 0; | |
1da177e4 | 2738 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2739 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2740 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2741 | |
2742 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2743 | if (!size) { | |
2744 | printk(KERN_WARNING | |
2745 | "md: %s has zero or unknown size, marking faulty!\n", | |
2746 | bdevname(rdev->bdev,b)); | |
2747 | err = -EINVAL; | |
2748 | goto abort_free; | |
2749 | } | |
2750 | ||
2751 | if (super_format >= 0) { | |
2752 | err = super_types[super_format]. | |
2753 | load_super(rdev, NULL, super_minor); | |
2754 | if (err == -EINVAL) { | |
df968c4e N |
2755 | printk(KERN_WARNING |
2756 | "md: %s does not have a valid v%d.%d " | |
2757 | "superblock, not importing!\n", | |
2758 | bdevname(rdev->bdev,b), | |
2759 | super_format, super_minor); | |
1da177e4 LT |
2760 | goto abort_free; |
2761 | } | |
2762 | if (err < 0) { | |
2763 | printk(KERN_WARNING | |
2764 | "md: could not read %s's sb, not importing!\n", | |
2765 | bdevname(rdev->bdev,b)); | |
2766 | goto abort_free; | |
2767 | } | |
2768 | } | |
6bfe0b49 | 2769 | |
1da177e4 | 2770 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2771 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2772 | |
2773 | return rdev; | |
2774 | ||
2775 | abort_free: | |
2776 | if (rdev->sb_page) { | |
2777 | if (rdev->bdev) | |
2778 | unlock_rdev(rdev); | |
2779 | free_disk_sb(rdev); | |
2780 | } | |
2781 | kfree(rdev); | |
2782 | return ERR_PTR(err); | |
2783 | } | |
2784 | ||
2785 | /* | |
2786 | * Check a full RAID array for plausibility | |
2787 | */ | |
2788 | ||
2789 | ||
a757e64c | 2790 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2791 | { |
2792 | int i; | |
159ec1fc | 2793 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2794 | char b[BDEVNAME_SIZE]; |
2795 | ||
2796 | freshest = NULL; | |
d089c6af | 2797 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2798 | switch (super_types[mddev->major_version]. |
2799 | load_super(rdev, freshest, mddev->minor_version)) { | |
2800 | case 1: | |
2801 | freshest = rdev; | |
2802 | break; | |
2803 | case 0: | |
2804 | break; | |
2805 | default: | |
2806 | printk( KERN_ERR \ | |
2807 | "md: fatal superblock inconsistency in %s" | |
2808 | " -- removing from array\n", | |
2809 | bdevname(rdev->bdev,b)); | |
2810 | kick_rdev_from_array(rdev); | |
2811 | } | |
2812 | ||
2813 | ||
2814 | super_types[mddev->major_version]. | |
2815 | validate_super(mddev, freshest); | |
2816 | ||
2817 | i = 0; | |
d089c6af | 2818 | rdev_for_each(rdev, tmp, mddev) { |
233fca36 N |
2819 | if (mddev->max_disks && |
2820 | (rdev->desc_nr >= mddev->max_disks || | |
2821 | i > mddev->max_disks)) { | |
de01dfad N |
2822 | printk(KERN_WARNING |
2823 | "md: %s: %s: only %d devices permitted\n", | |
2824 | mdname(mddev), bdevname(rdev->bdev, b), | |
2825 | mddev->max_disks); | |
2826 | kick_rdev_from_array(rdev); | |
2827 | continue; | |
2828 | } | |
1da177e4 LT |
2829 | if (rdev != freshest) |
2830 | if (super_types[mddev->major_version]. | |
2831 | validate_super(mddev, rdev)) { | |
2832 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2833 | " from array!\n", | |
2834 | bdevname(rdev->bdev,b)); | |
2835 | kick_rdev_from_array(rdev); | |
2836 | continue; | |
2837 | } | |
2838 | if (mddev->level == LEVEL_MULTIPATH) { | |
2839 | rdev->desc_nr = i++; | |
2840 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2841 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 2842 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
2843 | rdev->raid_disk = -1; |
2844 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2845 | } |
2846 | } | |
1da177e4 LT |
2847 | } |
2848 | ||
72e02075 N |
2849 | /* Read a fixed-point number. |
2850 | * Numbers in sysfs attributes should be in "standard" units where | |
2851 | * possible, so time should be in seconds. | |
2852 | * However we internally use a a much smaller unit such as | |
2853 | * milliseconds or jiffies. | |
2854 | * This function takes a decimal number with a possible fractional | |
2855 | * component, and produces an integer which is the result of | |
2856 | * multiplying that number by 10^'scale'. | |
2857 | * all without any floating-point arithmetic. | |
2858 | */ | |
2859 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
2860 | { | |
2861 | unsigned long result = 0; | |
2862 | long decimals = -1; | |
2863 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
2864 | if (*cp == '.') | |
2865 | decimals = 0; | |
2866 | else if (decimals < scale) { | |
2867 | unsigned int value; | |
2868 | value = *cp - '0'; | |
2869 | result = result * 10 + value; | |
2870 | if (decimals >= 0) | |
2871 | decimals++; | |
2872 | } | |
2873 | cp++; | |
2874 | } | |
2875 | if (*cp == '\n') | |
2876 | cp++; | |
2877 | if (*cp) | |
2878 | return -EINVAL; | |
2879 | if (decimals < 0) | |
2880 | decimals = 0; | |
2881 | while (decimals < scale) { | |
2882 | result *= 10; | |
2883 | decimals ++; | |
2884 | } | |
2885 | *res = result; | |
2886 | return 0; | |
2887 | } | |
2888 | ||
2889 | ||
19052c0e N |
2890 | static void md_safemode_timeout(unsigned long data); |
2891 | ||
16f17b39 N |
2892 | static ssize_t |
2893 | safe_delay_show(mddev_t *mddev, char *page) | |
2894 | { | |
2895 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2896 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2897 | } | |
2898 | static ssize_t | |
2899 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2900 | { | |
16f17b39 | 2901 | unsigned long msec; |
97ce0a7f | 2902 | |
72e02075 | 2903 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 2904 | return -EINVAL; |
16f17b39 N |
2905 | if (msec == 0) |
2906 | mddev->safemode_delay = 0; | |
2907 | else { | |
19052c0e | 2908 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2909 | mddev->safemode_delay = (msec*HZ)/1000; |
2910 | if (mddev->safemode_delay == 0) | |
2911 | mddev->safemode_delay = 1; | |
19052c0e N |
2912 | if (mddev->safemode_delay < old_delay) |
2913 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2914 | } |
2915 | return len; | |
2916 | } | |
2917 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2918 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2919 | |
eae1701f | 2920 | static ssize_t |
96de1e66 | 2921 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2922 | { |
2604b703 | 2923 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2924 | if (p) |
eae1701f | 2925 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2926 | else if (mddev->clevel[0]) |
2927 | return sprintf(page, "%s\n", mddev->clevel); | |
2928 | else if (mddev->level != LEVEL_NONE) | |
2929 | return sprintf(page, "%d\n", mddev->level); | |
2930 | else | |
2931 | return 0; | |
eae1701f N |
2932 | } |
2933 | ||
d9d166c2 N |
2934 | static ssize_t |
2935 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2936 | { | |
f2859af6 | 2937 | char clevel[16]; |
20a49ff6 | 2938 | ssize_t rv = len; |
245f46c2 | 2939 | struct mdk_personality *pers; |
f2859af6 | 2940 | long level; |
245f46c2 | 2941 | void *priv; |
3a981b03 | 2942 | mdk_rdev_t *rdev; |
245f46c2 N |
2943 | |
2944 | if (mddev->pers == NULL) { | |
2945 | if (len == 0) | |
2946 | return 0; | |
2947 | if (len >= sizeof(mddev->clevel)) | |
2948 | return -ENOSPC; | |
2949 | strncpy(mddev->clevel, buf, len); | |
2950 | if (mddev->clevel[len-1] == '\n') | |
2951 | len--; | |
2952 | mddev->clevel[len] = 0; | |
2953 | mddev->level = LEVEL_NONE; | |
2954 | return rv; | |
2955 | } | |
2956 | ||
2957 | /* request to change the personality. Need to ensure: | |
2958 | * - array is not engaged in resync/recovery/reshape | |
2959 | * - old personality can be suspended | |
2960 | * - new personality will access other array. | |
2961 | */ | |
2962 | ||
2963 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) | |
d9d166c2 | 2964 | return -EBUSY; |
245f46c2 N |
2965 | |
2966 | if (!mddev->pers->quiesce) { | |
2967 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
2968 | mdname(mddev), mddev->pers->name); | |
2969 | return -EINVAL; | |
2970 | } | |
2971 | ||
2972 | /* Now find the new personality */ | |
f2859af6 | 2973 | if (len == 0 || len >= sizeof(clevel)) |
245f46c2 | 2974 | return -EINVAL; |
f2859af6 DW |
2975 | strncpy(clevel, buf, len); |
2976 | if (clevel[len-1] == '\n') | |
d9d166c2 | 2977 | len--; |
f2859af6 DW |
2978 | clevel[len] = 0; |
2979 | if (strict_strtol(clevel, 10, &level)) | |
2980 | level = LEVEL_NONE; | |
245f46c2 | 2981 | |
f2859af6 DW |
2982 | if (request_module("md-%s", clevel) != 0) |
2983 | request_module("md-level-%s", clevel); | |
245f46c2 | 2984 | spin_lock(&pers_lock); |
f2859af6 | 2985 | pers = find_pers(level, clevel); |
245f46c2 N |
2986 | if (!pers || !try_module_get(pers->owner)) { |
2987 | spin_unlock(&pers_lock); | |
f2859af6 | 2988 | printk(KERN_WARNING "md: personality %s not loaded\n", clevel); |
245f46c2 N |
2989 | return -EINVAL; |
2990 | } | |
2991 | spin_unlock(&pers_lock); | |
2992 | ||
2993 | if (pers == mddev->pers) { | |
2994 | /* Nothing to do! */ | |
2995 | module_put(pers->owner); | |
2996 | return rv; | |
2997 | } | |
2998 | if (!pers->takeover) { | |
2999 | module_put(pers->owner); | |
3000 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
f2859af6 | 3001 | mdname(mddev), clevel); |
245f46c2 N |
3002 | return -EINVAL; |
3003 | } | |
3004 | ||
e93f68a1 N |
3005 | list_for_each_entry(rdev, &mddev->disks, same_set) |
3006 | rdev->new_raid_disk = rdev->raid_disk; | |
3007 | ||
245f46c2 N |
3008 | /* ->takeover must set new_* and/or delta_disks |
3009 | * if it succeeds, and may set them when it fails. | |
3010 | */ | |
3011 | priv = pers->takeover(mddev); | |
3012 | if (IS_ERR(priv)) { | |
3013 | mddev->new_level = mddev->level; | |
3014 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3015 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
3016 | mddev->raid_disks -= mddev->delta_disks; |
3017 | mddev->delta_disks = 0; | |
3018 | module_put(pers->owner); | |
3019 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
f2859af6 | 3020 | mdname(mddev), clevel); |
245f46c2 N |
3021 | return PTR_ERR(priv); |
3022 | } | |
3023 | ||
3024 | /* Looks like we have a winner */ | |
3025 | mddev_suspend(mddev); | |
3026 | mddev->pers->stop(mddev); | |
a64c876f N |
3027 | |
3028 | if (mddev->pers->sync_request == NULL && | |
3029 | pers->sync_request != NULL) { | |
3030 | /* need to add the md_redundancy_group */ | |
3031 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
3032 | printk(KERN_WARNING | |
3033 | "md: cannot register extra attributes for %s\n", | |
3034 | mdname(mddev)); | |
19fdb9ee | 3035 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
a64c876f N |
3036 | } |
3037 | if (mddev->pers->sync_request != NULL && | |
3038 | pers->sync_request == NULL) { | |
3039 | /* need to remove the md_redundancy_group */ | |
3040 | if (mddev->to_remove == NULL) | |
3041 | mddev->to_remove = &md_redundancy_group; | |
3042 | } | |
3043 | ||
54071b38 TM |
3044 | if (mddev->pers->sync_request == NULL && |
3045 | mddev->external) { | |
3046 | /* We are converting from a no-redundancy array | |
3047 | * to a redundancy array and metadata is managed | |
3048 | * externally so we need to be sure that writes | |
3049 | * won't block due to a need to transition | |
3050 | * clean->dirty | |
3051 | * until external management is started. | |
3052 | */ | |
3053 | mddev->in_sync = 0; | |
3054 | mddev->safemode_delay = 0; | |
3055 | mddev->safemode = 0; | |
3056 | } | |
3057 | ||
e93f68a1 N |
3058 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
3059 | char nm[20]; | |
3060 | if (rdev->raid_disk < 0) | |
3061 | continue; | |
3062 | if (rdev->new_raid_disk > mddev->raid_disks) | |
3063 | rdev->new_raid_disk = -1; | |
3064 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3065 | continue; | |
3066 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3067 | sysfs_remove_link(&mddev->kobj, nm); | |
3068 | } | |
3069 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
3070 | if (rdev->raid_disk < 0) | |
3071 | continue; | |
3072 | if (rdev->new_raid_disk == rdev->raid_disk) | |
3073 | continue; | |
3074 | rdev->raid_disk = rdev->new_raid_disk; | |
3075 | if (rdev->raid_disk < 0) | |
3a981b03 | 3076 | clear_bit(In_sync, &rdev->flags); |
e93f68a1 N |
3077 | else { |
3078 | char nm[20]; | |
3079 | sprintf(nm, "rd%d", rdev->raid_disk); | |
3080 | if(sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) | |
3081 | printk("md: cannot register %s for %s after level change\n", | |
3082 | nm, mdname(mddev)); | |
3a981b03 | 3083 | } |
e93f68a1 N |
3084 | } |
3085 | ||
3086 | module_put(mddev->pers->owner); | |
245f46c2 N |
3087 | mddev->pers = pers; |
3088 | mddev->private = priv; | |
3089 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
3090 | mddev->level = mddev->new_level; | |
3091 | mddev->layout = mddev->new_layout; | |
664e7c41 | 3092 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 | 3093 | mddev->delta_disks = 0; |
9af204cf TM |
3094 | if (mddev->pers->sync_request == NULL) { |
3095 | /* this is now an array without redundancy, so | |
3096 | * it must always be in_sync | |
3097 | */ | |
3098 | mddev->in_sync = 1; | |
3099 | del_timer_sync(&mddev->safemode_timer); | |
3100 | } | |
245f46c2 N |
3101 | pers->run(mddev); |
3102 | mddev_resume(mddev); | |
3103 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
3104 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3105 | md_wakeup_thread(mddev->thread); | |
5cac7861 | 3106 | sysfs_notify(&mddev->kobj, NULL, "level"); |
bb7f8d22 | 3107 | md_new_event(mddev); |
d9d166c2 N |
3108 | return rv; |
3109 | } | |
3110 | ||
3111 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 3112 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 3113 | |
d4dbd025 N |
3114 | |
3115 | static ssize_t | |
3116 | layout_show(mddev_t *mddev, char *page) | |
3117 | { | |
3118 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
3119 | if (mddev->reshape_position != MaxSector && |
3120 | mddev->layout != mddev->new_layout) | |
3121 | return sprintf(page, "%d (%d)\n", | |
3122 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
3123 | return sprintf(page, "%d\n", mddev->layout); |
3124 | } | |
3125 | ||
3126 | static ssize_t | |
3127 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
3128 | { | |
3129 | char *e; | |
3130 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
3131 | |
3132 | if (!*buf || (*e && *e != '\n')) | |
3133 | return -EINVAL; | |
3134 | ||
b3546035 N |
3135 | if (mddev->pers) { |
3136 | int err; | |
50ac168a | 3137 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3138 | return -EBUSY; |
597a711b | 3139 | mddev->new_layout = n; |
50ac168a | 3140 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3141 | if (err) { |
3142 | mddev->new_layout = mddev->layout; | |
b3546035 | 3143 | return err; |
597a711b | 3144 | } |
b3546035 | 3145 | } else { |
08a02ecd | 3146 | mddev->new_layout = n; |
b3546035 N |
3147 | if (mddev->reshape_position == MaxSector) |
3148 | mddev->layout = n; | |
3149 | } | |
d4dbd025 N |
3150 | return len; |
3151 | } | |
3152 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3153 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3154 | |
3155 | ||
eae1701f | 3156 | static ssize_t |
96de1e66 | 3157 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3158 | { |
bb636547 N |
3159 | if (mddev->raid_disks == 0) |
3160 | return 0; | |
08a02ecd N |
3161 | if (mddev->reshape_position != MaxSector && |
3162 | mddev->delta_disks != 0) | |
3163 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3164 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3165 | return sprintf(page, "%d\n", mddev->raid_disks); |
3166 | } | |
3167 | ||
da943b99 N |
3168 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3169 | ||
3170 | static ssize_t | |
3171 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3172 | { | |
da943b99 N |
3173 | char *e; |
3174 | int rv = 0; | |
3175 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3176 | ||
3177 | if (!*buf || (*e && *e != '\n')) | |
3178 | return -EINVAL; | |
3179 | ||
3180 | if (mddev->pers) | |
3181 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3182 | else if (mddev->reshape_position != MaxSector) { |
3183 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3184 | mddev->delta_disks = n - olddisks; | |
3185 | mddev->raid_disks = n; | |
3186 | } else | |
da943b99 N |
3187 | mddev->raid_disks = n; |
3188 | return rv ? rv : len; | |
3189 | } | |
3190 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3191 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3192 | |
3b34380a N |
3193 | static ssize_t |
3194 | chunk_size_show(mddev_t *mddev, char *page) | |
3195 | { | |
08a02ecd | 3196 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3197 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3198 | return sprintf(page, "%d (%d)\n", | |
3199 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3200 | mddev->chunk_sectors << 9); |
3201 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3202 | } |
3203 | ||
3204 | static ssize_t | |
3205 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3206 | { | |
3b34380a N |
3207 | char *e; |
3208 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3209 | ||
3b34380a N |
3210 | if (!*buf || (*e && *e != '\n')) |
3211 | return -EINVAL; | |
3212 | ||
b3546035 N |
3213 | if (mddev->pers) { |
3214 | int err; | |
50ac168a | 3215 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3216 | return -EBUSY; |
597a711b | 3217 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3218 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3219 | if (err) { |
3220 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3221 | return err; |
597a711b | 3222 | } |
b3546035 | 3223 | } else { |
664e7c41 | 3224 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3225 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3226 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3227 | } |
3b34380a N |
3228 | return len; |
3229 | } | |
3230 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3231 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3232 | |
a94213b1 N |
3233 | static ssize_t |
3234 | resync_start_show(mddev_t *mddev, char *page) | |
3235 | { | |
d1a7c503 N |
3236 | if (mddev->recovery_cp == MaxSector) |
3237 | return sprintf(page, "none\n"); | |
a94213b1 N |
3238 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3239 | } | |
3240 | ||
3241 | static ssize_t | |
3242 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3243 | { | |
a94213b1 N |
3244 | char *e; |
3245 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3246 | ||
3247 | if (mddev->pers) | |
3248 | return -EBUSY; | |
06e3c817 DW |
3249 | if (cmd_match(buf, "none")) |
3250 | n = MaxSector; | |
3251 | else if (!*buf || (*e && *e != '\n')) | |
a94213b1 N |
3252 | return -EINVAL; |
3253 | ||
3254 | mddev->recovery_cp = n; | |
3255 | return len; | |
3256 | } | |
3257 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3258 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3259 | |
9e653b63 N |
3260 | /* |
3261 | * The array state can be: | |
3262 | * | |
3263 | * clear | |
3264 | * No devices, no size, no level | |
3265 | * Equivalent to STOP_ARRAY ioctl | |
3266 | * inactive | |
3267 | * May have some settings, but array is not active | |
3268 | * all IO results in error | |
3269 | * When written, doesn't tear down array, but just stops it | |
3270 | * suspended (not supported yet) | |
3271 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3272 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3273 | * readonly |
3274 | * no resync can happen. no superblocks get written. | |
3275 | * write requests fail | |
3276 | * read-auto | |
3277 | * like readonly, but behaves like 'clean' on a write request. | |
3278 | * | |
3279 | * clean - no pending writes, but otherwise active. | |
3280 | * When written to inactive array, starts without resync | |
3281 | * If a write request arrives then | |
3282 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3283 | * if not known, block and switch to write-pending | |
3284 | * If written to an active array that has pending writes, then fails. | |
3285 | * active | |
3286 | * fully active: IO and resync can be happening. | |
3287 | * When written to inactive array, starts with resync | |
3288 | * | |
3289 | * write-pending | |
3290 | * clean, but writes are blocked waiting for 'active' to be written. | |
3291 | * | |
3292 | * active-idle | |
3293 | * like active, but no writes have been seen for a while (100msec). | |
3294 | * | |
3295 | */ | |
3296 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3297 | write_pending, active_idle, bad_word}; | |
05381954 | 3298 | static char *array_states[] = { |
9e653b63 N |
3299 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3300 | "write-pending", "active-idle", NULL }; | |
3301 | ||
3302 | static int match_word(const char *word, char **list) | |
3303 | { | |
3304 | int n; | |
3305 | for (n=0; list[n]; n++) | |
3306 | if (cmd_match(word, list[n])) | |
3307 | break; | |
3308 | return n; | |
3309 | } | |
3310 | ||
3311 | static ssize_t | |
3312 | array_state_show(mddev_t *mddev, char *page) | |
3313 | { | |
3314 | enum array_state st = inactive; | |
3315 | ||
3316 | if (mddev->pers) | |
3317 | switch(mddev->ro) { | |
3318 | case 1: | |
3319 | st = readonly; | |
3320 | break; | |
3321 | case 2: | |
3322 | st = read_auto; | |
3323 | break; | |
3324 | case 0: | |
3325 | if (mddev->in_sync) | |
3326 | st = clean; | |
e691063a N |
3327 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
3328 | st = write_pending; | |
9e653b63 N |
3329 | else if (mddev->safemode) |
3330 | st = active_idle; | |
3331 | else | |
3332 | st = active; | |
3333 | } | |
3334 | else { | |
3335 | if (list_empty(&mddev->disks) && | |
3336 | mddev->raid_disks == 0 && | |
58c0fed4 | 3337 | mddev->dev_sectors == 0) |
9e653b63 N |
3338 | st = clear; |
3339 | else | |
3340 | st = inactive; | |
3341 | } | |
3342 | return sprintf(page, "%s\n", array_states[st]); | |
3343 | } | |
3344 | ||
df5b20cf | 3345 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
a4bd82d0 | 3346 | static int md_set_readonly(mddev_t * mddev, int is_open); |
9e653b63 N |
3347 | static int do_md_run(mddev_t * mddev); |
3348 | static int restart_array(mddev_t *mddev); | |
3349 | ||
3350 | static ssize_t | |
3351 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3352 | { | |
3353 | int err = -EINVAL; | |
3354 | enum array_state st = match_word(buf, array_states); | |
3355 | switch(st) { | |
3356 | case bad_word: | |
3357 | break; | |
3358 | case clear: | |
3359 | /* stopping an active array */ | |
f2ea68cf | 3360 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3361 | return -EBUSY; |
df5b20cf | 3362 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3363 | break; |
3364 | case inactive: | |
3365 | /* stopping an active array */ | |
3366 | if (mddev->pers) { | |
f2ea68cf | 3367 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3368 | return -EBUSY; |
df5b20cf | 3369 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3370 | } else |
3371 | err = 0; /* already inactive */ | |
9e653b63 N |
3372 | break; |
3373 | case suspended: | |
3374 | break; /* not supported yet */ | |
3375 | case readonly: | |
3376 | if (mddev->pers) | |
a4bd82d0 | 3377 | err = md_set_readonly(mddev, 0); |
9e653b63 N |
3378 | else { |
3379 | mddev->ro = 1; | |
648b629e | 3380 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3381 | err = do_md_run(mddev); |
3382 | } | |
3383 | break; | |
3384 | case read_auto: | |
9e653b63 | 3385 | if (mddev->pers) { |
80268ee9 | 3386 | if (mddev->ro == 0) |
a4bd82d0 | 3387 | err = md_set_readonly(mddev, 0); |
80268ee9 | 3388 | else if (mddev->ro == 1) |
648b629e N |
3389 | err = restart_array(mddev); |
3390 | if (err == 0) { | |
3391 | mddev->ro = 2; | |
3392 | set_disk_ro(mddev->gendisk, 0); | |
3393 | } | |
9e653b63 N |
3394 | } else { |
3395 | mddev->ro = 2; | |
3396 | err = do_md_run(mddev); | |
3397 | } | |
3398 | break; | |
3399 | case clean: | |
3400 | if (mddev->pers) { | |
3401 | restart_array(mddev); | |
3402 | spin_lock_irq(&mddev->write_lock); | |
3403 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3404 | if (mddev->in_sync == 0) { |
3405 | mddev->in_sync = 1; | |
31a59e34 N |
3406 | if (mddev->safemode == 1) |
3407 | mddev->safemode = 0; | |
e691063a N |
3408 | if (mddev->persistent) |
3409 | set_bit(MD_CHANGE_CLEAN, | |
3410 | &mddev->flags); | |
3411 | } | |
3412 | err = 0; | |
3413 | } else | |
3414 | err = -EBUSY; | |
9e653b63 | 3415 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3416 | } else |
3417 | err = -EINVAL; | |
9e653b63 N |
3418 | break; |
3419 | case active: | |
3420 | if (mddev->pers) { | |
3421 | restart_array(mddev); | |
e691063a N |
3422 | if (mddev->external) |
3423 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
3424 | wake_up(&mddev->sb_wait); |
3425 | err = 0; | |
3426 | } else { | |
3427 | mddev->ro = 0; | |
648b629e | 3428 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3429 | err = do_md_run(mddev); |
3430 | } | |
3431 | break; | |
3432 | case write_pending: | |
3433 | case active_idle: | |
3434 | /* these cannot be set */ | |
3435 | break; | |
3436 | } | |
3437 | if (err) | |
3438 | return err; | |
0fd62b86 | 3439 | else { |
b62b7590 | 3440 | sysfs_notify_dirent(mddev->sysfs_state); |
9e653b63 | 3441 | return len; |
0fd62b86 | 3442 | } |
9e653b63 | 3443 | } |
80ca3a44 N |
3444 | static struct md_sysfs_entry md_array_state = |
3445 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3446 | |
1e50915f RB |
3447 | static ssize_t |
3448 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3449 | return sprintf(page, "%d\n", | |
3450 | atomic_read(&mddev->max_corr_read_errors)); | |
3451 | } | |
3452 | ||
3453 | static ssize_t | |
3454 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3455 | { | |
3456 | char *e; | |
3457 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3458 | ||
3459 | if (*buf && (*e == 0 || *e == '\n')) { | |
3460 | atomic_set(&mddev->max_corr_read_errors, n); | |
3461 | return len; | |
3462 | } | |
3463 | return -EINVAL; | |
3464 | } | |
3465 | ||
3466 | static struct md_sysfs_entry max_corr_read_errors = | |
3467 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3468 | max_corrected_read_errors_store); | |
3469 | ||
6d7ff738 N |
3470 | static ssize_t |
3471 | null_show(mddev_t *mddev, char *page) | |
3472 | { | |
3473 | return -EINVAL; | |
3474 | } | |
3475 | ||
3476 | static ssize_t | |
3477 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3478 | { | |
3479 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3480 | /* The new device is added to the array. | |
3481 | * If the array has a persistent superblock, we read the | |
3482 | * superblock to initialise info and check validity. | |
3483 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3484 | * which mainly checks size. | |
3485 | */ | |
3486 | char *e; | |
3487 | int major = simple_strtoul(buf, &e, 10); | |
3488 | int minor; | |
3489 | dev_t dev; | |
3490 | mdk_rdev_t *rdev; | |
3491 | int err; | |
3492 | ||
3493 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3494 | return -EINVAL; | |
3495 | minor = simple_strtoul(e+1, &e, 10); | |
3496 | if (*e && *e != '\n') | |
3497 | return -EINVAL; | |
3498 | dev = MKDEV(major, minor); | |
3499 | if (major != MAJOR(dev) || | |
3500 | minor != MINOR(dev)) | |
3501 | return -EOVERFLOW; | |
3502 | ||
3503 | ||
3504 | if (mddev->persistent) { | |
3505 | rdev = md_import_device(dev, mddev->major_version, | |
3506 | mddev->minor_version); | |
3507 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3508 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3509 | mdk_rdev_t, same_set); | |
3510 | err = super_types[mddev->major_version] | |
3511 | .load_super(rdev, rdev0, mddev->minor_version); | |
3512 | if (err < 0) | |
3513 | goto out; | |
3514 | } | |
c5d79adb N |
3515 | } else if (mddev->external) |
3516 | rdev = md_import_device(dev, -2, -1); | |
3517 | else | |
6d7ff738 N |
3518 | rdev = md_import_device(dev, -1, -1); |
3519 | ||
3520 | if (IS_ERR(rdev)) | |
3521 | return PTR_ERR(rdev); | |
3522 | err = bind_rdev_to_array(rdev, mddev); | |
3523 | out: | |
3524 | if (err) | |
3525 | export_rdev(rdev); | |
3526 | return err ? err : len; | |
3527 | } | |
3528 | ||
3529 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3530 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3531 | |
9b1d1dac PC |
3532 | static ssize_t |
3533 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3534 | { | |
3535 | char *end; | |
3536 | unsigned long chunk, end_chunk; | |
3537 | ||
3538 | if (!mddev->bitmap) | |
3539 | goto out; | |
3540 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3541 | while (*buf) { | |
3542 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3543 | if (buf == end) break; | |
3544 | if (*end == '-') { /* range */ | |
3545 | buf = end + 1; | |
3546 | end_chunk = simple_strtoul(buf, &end, 0); | |
3547 | if (buf == end) break; | |
3548 | } | |
3549 | if (*end && !isspace(*end)) break; | |
3550 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
e7d2860b | 3551 | buf = skip_spaces(end); |
9b1d1dac PC |
3552 | } |
3553 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3554 | out: | |
3555 | return len; | |
3556 | } | |
3557 | ||
3558 | static struct md_sysfs_entry md_bitmap = | |
3559 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3560 | ||
a35b0d69 N |
3561 | static ssize_t |
3562 | size_show(mddev_t *mddev, char *page) | |
3563 | { | |
58c0fed4 AN |
3564 | return sprintf(page, "%llu\n", |
3565 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3566 | } |
3567 | ||
d71f9f88 | 3568 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3569 | |
3570 | static ssize_t | |
3571 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3572 | { | |
3573 | /* If array is inactive, we can reduce the component size, but | |
3574 | * not increase it (except from 0). | |
3575 | * If array is active, we can try an on-line resize | |
3576 | */ | |
b522adcd DW |
3577 | sector_t sectors; |
3578 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3579 | |
58c0fed4 AN |
3580 | if (err < 0) |
3581 | return err; | |
a35b0d69 | 3582 | if (mddev->pers) { |
58c0fed4 | 3583 | err = update_size(mddev, sectors); |
850b2b42 | 3584 | md_update_sb(mddev, 1); |
a35b0d69 | 3585 | } else { |
58c0fed4 AN |
3586 | if (mddev->dev_sectors == 0 || |
3587 | mddev->dev_sectors > sectors) | |
3588 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3589 | else |
3590 | err = -ENOSPC; | |
3591 | } | |
3592 | return err ? err : len; | |
3593 | } | |
3594 | ||
3595 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3596 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3597 | |
8bb93aac N |
3598 | |
3599 | /* Metdata version. | |
e691063a N |
3600 | * This is one of |
3601 | * 'none' for arrays with no metadata (good luck...) | |
3602 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3603 | * or N.M for internally known formats |
3604 | */ | |
3605 | static ssize_t | |
3606 | metadata_show(mddev_t *mddev, char *page) | |
3607 | { | |
3608 | if (mddev->persistent) | |
3609 | return sprintf(page, "%d.%d\n", | |
3610 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3611 | else if (mddev->external) |
3612 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3613 | else |
3614 | return sprintf(page, "none\n"); | |
3615 | } | |
3616 | ||
3617 | static ssize_t | |
3618 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3619 | { | |
3620 | int major, minor; | |
3621 | char *e; | |
ea43ddd8 N |
3622 | /* Changing the details of 'external' metadata is |
3623 | * always permitted. Otherwise there must be | |
3624 | * no devices attached to the array. | |
3625 | */ | |
3626 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3627 | ; | |
3628 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3629 | return -EBUSY; |
3630 | ||
3631 | if (cmd_match(buf, "none")) { | |
3632 | mddev->persistent = 0; | |
e691063a N |
3633 | mddev->external = 0; |
3634 | mddev->major_version = 0; | |
3635 | mddev->minor_version = 90; | |
3636 | return len; | |
3637 | } | |
3638 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3639 | size_t namelen = len-9; |
e691063a N |
3640 | if (namelen >= sizeof(mddev->metadata_type)) |
3641 | namelen = sizeof(mddev->metadata_type)-1; | |
3642 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3643 | mddev->metadata_type[namelen] = 0; | |
3644 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3645 | mddev->metadata_type[--namelen] = 0; | |
3646 | mddev->persistent = 0; | |
3647 | mddev->external = 1; | |
8bb93aac N |
3648 | mddev->major_version = 0; |
3649 | mddev->minor_version = 90; | |
3650 | return len; | |
3651 | } | |
3652 | major = simple_strtoul(buf, &e, 10); | |
3653 | if (e==buf || *e != '.') | |
3654 | return -EINVAL; | |
3655 | buf = e+1; | |
3656 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3657 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3658 | return -EINVAL; |
50511da3 | 3659 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3660 | return -ENOENT; |
3661 | mddev->major_version = major; | |
3662 | mddev->minor_version = minor; | |
3663 | mddev->persistent = 1; | |
e691063a | 3664 | mddev->external = 0; |
8bb93aac N |
3665 | return len; |
3666 | } | |
3667 | ||
3668 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3669 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3670 | |
24dd469d | 3671 | static ssize_t |
7eec314d | 3672 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3673 | { |
7eec314d | 3674 | char *type = "idle"; |
b6a9ce68 N |
3675 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3676 | type = "frozen"; | |
3677 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3678 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3679 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3680 | type = "reshape"; | |
3681 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3682 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3683 | type = "resync"; | |
3684 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3685 | type = "check"; | |
3686 | else | |
3687 | type = "repair"; | |
72a23c21 | 3688 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3689 | type = "recover"; |
3690 | } | |
3691 | return sprintf(page, "%s\n", type); | |
3692 | } | |
3693 | ||
3694 | static ssize_t | |
7eec314d | 3695 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3696 | { |
7eec314d N |
3697 | if (!mddev->pers || !mddev->pers->sync_request) |
3698 | return -EINVAL; | |
3699 | ||
b6a9ce68 N |
3700 | if (cmd_match(page, "frozen")) |
3701 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3702 | else | |
3703 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3704 | ||
3705 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
3706 | if (mddev->sync_thread) { |
3707 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3708 | md_unregister_thread(mddev->sync_thread); | |
3709 | mddev->sync_thread = NULL; | |
3710 | mddev->recovery = 0; | |
3711 | } | |
03c902e1 N |
3712 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3713 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3714 | return -EBUSY; |
72a23c21 NB |
3715 | else if (cmd_match(page, "resync")) |
3716 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3717 | else if (cmd_match(page, "recover")) { | |
3718 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3719 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3720 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3721 | int err; |
3722 | if (mddev->pers->start_reshape == NULL) | |
3723 | return -EINVAL; | |
3724 | err = mddev->pers->start_reshape(mddev); | |
3725 | if (err) | |
3726 | return err; | |
a99ac971 | 3727 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3728 | } else { |
bce74dac | 3729 | if (cmd_match(page, "check")) |
7eec314d | 3730 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3731 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3732 | return -EINVAL; |
3733 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3734 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3735 | } |
03c902e1 | 3736 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3737 | md_wakeup_thread(mddev->thread); |
0c3573f1 | 3738 | sysfs_notify_dirent(mddev->sysfs_action); |
24dd469d N |
3739 | return len; |
3740 | } | |
3741 | ||
9d88883e | 3742 | static ssize_t |
96de1e66 | 3743 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3744 | { |
3745 | return sprintf(page, "%llu\n", | |
3746 | (unsigned long long) mddev->resync_mismatches); | |
3747 | } | |
3748 | ||
80ca3a44 N |
3749 | static struct md_sysfs_entry md_scan_mode = |
3750 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3751 | |
96de1e66 | 3752 | |
80ca3a44 | 3753 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3754 | |
88202a0c N |
3755 | static ssize_t |
3756 | sync_min_show(mddev_t *mddev, char *page) | |
3757 | { | |
3758 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3759 | mddev->sync_speed_min ? "local": "system"); | |
3760 | } | |
3761 | ||
3762 | static ssize_t | |
3763 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3764 | { | |
3765 | int min; | |
3766 | char *e; | |
3767 | if (strncmp(buf, "system", 6)==0) { | |
3768 | mddev->sync_speed_min = 0; | |
3769 | return len; | |
3770 | } | |
3771 | min = simple_strtoul(buf, &e, 10); | |
3772 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3773 | return -EINVAL; | |
3774 | mddev->sync_speed_min = min; | |
3775 | return len; | |
3776 | } | |
3777 | ||
3778 | static struct md_sysfs_entry md_sync_min = | |
3779 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3780 | ||
3781 | static ssize_t | |
3782 | sync_max_show(mddev_t *mddev, char *page) | |
3783 | { | |
3784 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3785 | mddev->sync_speed_max ? "local": "system"); | |
3786 | } | |
3787 | ||
3788 | static ssize_t | |
3789 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3790 | { | |
3791 | int max; | |
3792 | char *e; | |
3793 | if (strncmp(buf, "system", 6)==0) { | |
3794 | mddev->sync_speed_max = 0; | |
3795 | return len; | |
3796 | } | |
3797 | max = simple_strtoul(buf, &e, 10); | |
3798 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3799 | return -EINVAL; | |
3800 | mddev->sync_speed_max = max; | |
3801 | return len; | |
3802 | } | |
3803 | ||
3804 | static struct md_sysfs_entry md_sync_max = | |
3805 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3806 | ||
d7f3d291 IP |
3807 | static ssize_t |
3808 | degraded_show(mddev_t *mddev, char *page) | |
3809 | { | |
3810 | return sprintf(page, "%d\n", mddev->degraded); | |
3811 | } | |
3812 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3813 | |
90b08710 BS |
3814 | static ssize_t |
3815 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3816 | { | |
3817 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3818 | } | |
3819 | ||
3820 | static ssize_t | |
3821 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3822 | { | |
3823 | long n; | |
3824 | ||
3825 | if (strict_strtol(buf, 10, &n)) | |
3826 | return -EINVAL; | |
3827 | ||
3828 | if (n != 0 && n != 1) | |
3829 | return -EINVAL; | |
3830 | ||
3831 | mddev->parallel_resync = n; | |
3832 | ||
3833 | if (mddev->sync_thread) | |
3834 | wake_up(&resync_wait); | |
3835 | ||
3836 | return len; | |
3837 | } | |
3838 | ||
3839 | /* force parallel resync, even with shared block devices */ | |
3840 | static struct md_sysfs_entry md_sync_force_parallel = | |
3841 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3842 | sync_force_parallel_show, sync_force_parallel_store); | |
3843 | ||
88202a0c N |
3844 | static ssize_t |
3845 | sync_speed_show(mddev_t *mddev, char *page) | |
3846 | { | |
3847 | unsigned long resync, dt, db; | |
d1a7c503 N |
3848 | if (mddev->curr_resync == 0) |
3849 | return sprintf(page, "none\n"); | |
9687a60c AN |
3850 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3851 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3852 | if (!dt) dt++; |
9687a60c AN |
3853 | db = resync - mddev->resync_mark_cnt; |
3854 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3855 | } |
3856 | ||
80ca3a44 | 3857 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3858 | |
3859 | static ssize_t | |
3860 | sync_completed_show(mddev_t *mddev, char *page) | |
3861 | { | |
58c0fed4 | 3862 | unsigned long max_sectors, resync; |
88202a0c | 3863 | |
acb180b0 N |
3864 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3865 | return sprintf(page, "none\n"); | |
3866 | ||
88202a0c | 3867 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 3868 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3869 | else |
58c0fed4 | 3870 | max_sectors = mddev->dev_sectors; |
88202a0c | 3871 | |
acb180b0 | 3872 | resync = mddev->curr_resync_completed; |
58c0fed4 | 3873 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
88202a0c N |
3874 | } |
3875 | ||
80ca3a44 | 3876 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3877 | |
5e96ee65 NB |
3878 | static ssize_t |
3879 | min_sync_show(mddev_t *mddev, char *page) | |
3880 | { | |
3881 | return sprintf(page, "%llu\n", | |
3882 | (unsigned long long)mddev->resync_min); | |
3883 | } | |
3884 | static ssize_t | |
3885 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3886 | { | |
3887 | unsigned long long min; | |
3888 | if (strict_strtoull(buf, 10, &min)) | |
3889 | return -EINVAL; | |
3890 | if (min > mddev->resync_max) | |
3891 | return -EINVAL; | |
3892 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3893 | return -EBUSY; | |
3894 | ||
3895 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3896 | if (mddev->chunk_sectors) { |
2ac06c33 | 3897 | sector_t temp = min; |
9d8f0363 | 3898 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
3899 | return -EINVAL; |
3900 | } | |
3901 | mddev->resync_min = min; | |
3902 | ||
3903 | return len; | |
3904 | } | |
3905 | ||
3906 | static struct md_sysfs_entry md_min_sync = | |
3907 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3908 | ||
c6207277 N |
3909 | static ssize_t |
3910 | max_sync_show(mddev_t *mddev, char *page) | |
3911 | { | |
3912 | if (mddev->resync_max == MaxSector) | |
3913 | return sprintf(page, "max\n"); | |
3914 | else | |
3915 | return sprintf(page, "%llu\n", | |
3916 | (unsigned long long)mddev->resync_max); | |
3917 | } | |
3918 | static ssize_t | |
3919 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3920 | { | |
3921 | if (strncmp(buf, "max", 3) == 0) | |
3922 | mddev->resync_max = MaxSector; | |
3923 | else { | |
5e96ee65 NB |
3924 | unsigned long long max; |
3925 | if (strict_strtoull(buf, 10, &max)) | |
3926 | return -EINVAL; | |
3927 | if (max < mddev->resync_min) | |
c6207277 N |
3928 | return -EINVAL; |
3929 | if (max < mddev->resync_max && | |
4d484a4a | 3930 | mddev->ro == 0 && |
c6207277 N |
3931 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3932 | return -EBUSY; | |
3933 | ||
3934 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3935 | if (mddev->chunk_sectors) { |
2ac06c33 | 3936 | sector_t temp = max; |
9d8f0363 | 3937 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
3938 | return -EINVAL; |
3939 | } | |
3940 | mddev->resync_max = max; | |
3941 | } | |
3942 | wake_up(&mddev->recovery_wait); | |
3943 | return len; | |
3944 | } | |
3945 | ||
3946 | static struct md_sysfs_entry md_max_sync = | |
3947 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3948 | ||
e464eafd N |
3949 | static ssize_t |
3950 | suspend_lo_show(mddev_t *mddev, char *page) | |
3951 | { | |
3952 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3953 | } | |
3954 | ||
3955 | static ssize_t | |
3956 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3957 | { | |
3958 | char *e; | |
3959 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3960 | ||
b8d966ef N |
3961 | if (mddev->pers == NULL || |
3962 | mddev->pers->quiesce == NULL) | |
e464eafd N |
3963 | return -EINVAL; |
3964 | if (buf == e || (*e && *e != '\n')) | |
3965 | return -EINVAL; | |
3966 | if (new >= mddev->suspend_hi || | |
3967 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3968 | mddev->suspend_lo = new; | |
3969 | mddev->pers->quiesce(mddev, 2); | |
3970 | return len; | |
3971 | } else | |
3972 | return -EINVAL; | |
3973 | } | |
3974 | static struct md_sysfs_entry md_suspend_lo = | |
3975 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3976 | ||
3977 | ||
3978 | static ssize_t | |
3979 | suspend_hi_show(mddev_t *mddev, char *page) | |
3980 | { | |
3981 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3982 | } | |
3983 | ||
3984 | static ssize_t | |
3985 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3986 | { | |
3987 | char *e; | |
3988 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3989 | ||
b8d966ef N |
3990 | if (mddev->pers == NULL || |
3991 | mddev->pers->quiesce == NULL) | |
e464eafd N |
3992 | return -EINVAL; |
3993 | if (buf == e || (*e && *e != '\n')) | |
3994 | return -EINVAL; | |
3995 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3996 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3997 | mddev->suspend_hi = new; | |
3998 | mddev->pers->quiesce(mddev, 1); | |
3999 | mddev->pers->quiesce(mddev, 0); | |
4000 | return len; | |
4001 | } else | |
4002 | return -EINVAL; | |
4003 | } | |
4004 | static struct md_sysfs_entry md_suspend_hi = | |
4005 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
4006 | ||
08a02ecd N |
4007 | static ssize_t |
4008 | reshape_position_show(mddev_t *mddev, char *page) | |
4009 | { | |
4010 | if (mddev->reshape_position != MaxSector) | |
4011 | return sprintf(page, "%llu\n", | |
4012 | (unsigned long long)mddev->reshape_position); | |
4013 | strcpy(page, "none\n"); | |
4014 | return 5; | |
4015 | } | |
4016 | ||
4017 | static ssize_t | |
4018 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
4019 | { | |
4020 | char *e; | |
4021 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
4022 | if (mddev->pers) | |
4023 | return -EBUSY; | |
4024 | if (buf == e || (*e && *e != '\n')) | |
4025 | return -EINVAL; | |
4026 | mddev->reshape_position = new; | |
4027 | mddev->delta_disks = 0; | |
4028 | mddev->new_level = mddev->level; | |
4029 | mddev->new_layout = mddev->layout; | |
664e7c41 | 4030 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
4031 | return len; |
4032 | } | |
4033 | ||
4034 | static struct md_sysfs_entry md_reshape_position = | |
4035 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
4036 | reshape_position_store); | |
4037 | ||
b522adcd DW |
4038 | static ssize_t |
4039 | array_size_show(mddev_t *mddev, char *page) | |
4040 | { | |
4041 | if (mddev->external_size) | |
4042 | return sprintf(page, "%llu\n", | |
4043 | (unsigned long long)mddev->array_sectors/2); | |
4044 | else | |
4045 | return sprintf(page, "default\n"); | |
4046 | } | |
4047 | ||
4048 | static ssize_t | |
4049 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
4050 | { | |
4051 | sector_t sectors; | |
4052 | ||
4053 | if (strncmp(buf, "default", 7) == 0) { | |
4054 | if (mddev->pers) | |
4055 | sectors = mddev->pers->size(mddev, 0, 0); | |
4056 | else | |
4057 | sectors = mddev->array_sectors; | |
4058 | ||
4059 | mddev->external_size = 0; | |
4060 | } else { | |
4061 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
4062 | return -EINVAL; | |
4063 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 4064 | return -E2BIG; |
b522adcd DW |
4065 | |
4066 | mddev->external_size = 1; | |
4067 | } | |
4068 | ||
4069 | mddev->array_sectors = sectors; | |
4070 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e N |
4071 | if (mddev->pers) |
4072 | revalidate_disk(mddev->gendisk); | |
b522adcd DW |
4073 | |
4074 | return len; | |
4075 | } | |
4076 | ||
4077 | static struct md_sysfs_entry md_array_size = | |
4078 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
4079 | array_size_store); | |
e464eafd | 4080 | |
eae1701f N |
4081 | static struct attribute *md_default_attrs[] = { |
4082 | &md_level.attr, | |
d4dbd025 | 4083 | &md_layout.attr, |
eae1701f | 4084 | &md_raid_disks.attr, |
3b34380a | 4085 | &md_chunk_size.attr, |
a35b0d69 | 4086 | &md_size.attr, |
a94213b1 | 4087 | &md_resync_start.attr, |
8bb93aac | 4088 | &md_metadata.attr, |
6d7ff738 | 4089 | &md_new_device.attr, |
16f17b39 | 4090 | &md_safe_delay.attr, |
9e653b63 | 4091 | &md_array_state.attr, |
08a02ecd | 4092 | &md_reshape_position.attr, |
b522adcd | 4093 | &md_array_size.attr, |
1e50915f | 4094 | &max_corr_read_errors.attr, |
411036fa N |
4095 | NULL, |
4096 | }; | |
4097 | ||
4098 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 4099 | &md_scan_mode.attr, |
9d88883e | 4100 | &md_mismatches.attr, |
88202a0c N |
4101 | &md_sync_min.attr, |
4102 | &md_sync_max.attr, | |
4103 | &md_sync_speed.attr, | |
90b08710 | 4104 | &md_sync_force_parallel.attr, |
88202a0c | 4105 | &md_sync_completed.attr, |
5e96ee65 | 4106 | &md_min_sync.attr, |
c6207277 | 4107 | &md_max_sync.attr, |
e464eafd N |
4108 | &md_suspend_lo.attr, |
4109 | &md_suspend_hi.attr, | |
9b1d1dac | 4110 | &md_bitmap.attr, |
d7f3d291 | 4111 | &md_degraded.attr, |
eae1701f N |
4112 | NULL, |
4113 | }; | |
411036fa N |
4114 | static struct attribute_group md_redundancy_group = { |
4115 | .name = NULL, | |
4116 | .attrs = md_redundancy_attrs, | |
4117 | }; | |
4118 | ||
eae1701f N |
4119 | |
4120 | static ssize_t | |
4121 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
4122 | { | |
4123 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4124 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4125 | ssize_t rv; |
eae1701f N |
4126 | |
4127 | if (!entry->show) | |
4128 | return -EIO; | |
5dc5cf7d IM |
4129 | rv = mddev_lock(mddev); |
4130 | if (!rv) { | |
4131 | rv = entry->show(mddev, page); | |
4132 | mddev_unlock(mddev); | |
4133 | } | |
96de1e66 | 4134 | return rv; |
eae1701f N |
4135 | } |
4136 | ||
4137 | static ssize_t | |
4138 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
4139 | const char *page, size_t length) | |
4140 | { | |
4141 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
4142 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 4143 | ssize_t rv; |
eae1701f N |
4144 | |
4145 | if (!entry->store) | |
4146 | return -EIO; | |
67463acb N |
4147 | if (!capable(CAP_SYS_ADMIN)) |
4148 | return -EACCES; | |
5dc5cf7d | 4149 | rv = mddev_lock(mddev); |
d3374825 N |
4150 | if (mddev->hold_active == UNTIL_IOCTL) |
4151 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4152 | if (!rv) { |
4153 | rv = entry->store(mddev, page, length); | |
4154 | mddev_unlock(mddev); | |
4155 | } | |
96de1e66 | 4156 | return rv; |
eae1701f N |
4157 | } |
4158 | ||
4159 | static void md_free(struct kobject *ko) | |
4160 | { | |
4161 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4162 | |
4163 | if (mddev->sysfs_state) | |
4164 | sysfs_put(mddev->sysfs_state); | |
4165 | ||
4166 | if (mddev->gendisk) { | |
4167 | del_gendisk(mddev->gendisk); | |
4168 | put_disk(mddev->gendisk); | |
4169 | } | |
4170 | if (mddev->queue) | |
4171 | blk_cleanup_queue(mddev->queue); | |
4172 | ||
eae1701f N |
4173 | kfree(mddev); |
4174 | } | |
4175 | ||
52cf25d0 | 4176 | static const struct sysfs_ops md_sysfs_ops = { |
eae1701f N |
4177 | .show = md_attr_show, |
4178 | .store = md_attr_store, | |
4179 | }; | |
4180 | static struct kobj_type md_ktype = { | |
4181 | .release = md_free, | |
4182 | .sysfs_ops = &md_sysfs_ops, | |
4183 | .default_attrs = md_default_attrs, | |
4184 | }; | |
4185 | ||
1da177e4 LT |
4186 | int mdp_major = 0; |
4187 | ||
5fd3a17e DW |
4188 | static void mddev_delayed_delete(struct work_struct *ws) |
4189 | { | |
4190 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4191 | ||
43a70507 | 4192 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4193 | kobject_del(&mddev->kobj); |
4194 | kobject_put(&mddev->kobj); | |
4195 | } | |
4196 | ||
efeb53c0 | 4197 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4198 | { |
48c9c27b | 4199 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4200 | mddev_t *mddev = mddev_find(dev); |
4201 | struct gendisk *disk; | |
efeb53c0 N |
4202 | int partitioned; |
4203 | int shift; | |
4204 | int unit; | |
3830c62f | 4205 | int error; |
1da177e4 LT |
4206 | |
4207 | if (!mddev) | |
efeb53c0 N |
4208 | return -ENODEV; |
4209 | ||
4210 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4211 | shift = partitioned ? MdpMinorShift : 0; | |
4212 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4213 | |
d3374825 N |
4214 | /* wait for any previous instance if this device |
4215 | * to be completed removed (mddev_delayed_delete). | |
4216 | */ | |
4217 | flush_scheduled_work(); | |
4218 | ||
48c9c27b | 4219 | mutex_lock(&disks_mutex); |
0909dc44 N |
4220 | error = -EEXIST; |
4221 | if (mddev->gendisk) | |
4222 | goto abort; | |
efeb53c0 N |
4223 | |
4224 | if (name) { | |
4225 | /* Need to ensure that 'name' is not a duplicate. | |
4226 | */ | |
4227 | mddev_t *mddev2; | |
4228 | spin_lock(&all_mddevs_lock); | |
4229 | ||
4230 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4231 | if (mddev2->gendisk && | |
4232 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4233 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4234 | goto abort; |
efeb53c0 N |
4235 | } |
4236 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4237 | } |
8b765398 | 4238 | |
0909dc44 | 4239 | error = -ENOMEM; |
8b765398 | 4240 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4241 | if (!mddev->queue) |
4242 | goto abort; | |
409c57f3 N |
4243 | mddev->queue->queuedata = mddev; |
4244 | ||
8b765398 N |
4245 | /* Can be unlocked because the queue is new: no concurrency */ |
4246 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
4247 | ||
409c57f3 | 4248 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4249 | |
1da177e4 LT |
4250 | disk = alloc_disk(1 << shift); |
4251 | if (!disk) { | |
8b765398 N |
4252 | blk_cleanup_queue(mddev->queue); |
4253 | mddev->queue = NULL; | |
0909dc44 | 4254 | goto abort; |
1da177e4 | 4255 | } |
efeb53c0 | 4256 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4257 | disk->first_minor = unit << shift; |
efeb53c0 N |
4258 | if (name) |
4259 | strcpy(disk->disk_name, name); | |
4260 | else if (partitioned) | |
1da177e4 | 4261 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4262 | else |
1da177e4 | 4263 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4264 | disk->fops = &md_fops; |
4265 | disk->private_data = mddev; | |
4266 | disk->queue = mddev->queue; | |
92850bbd | 4267 | /* Allow extended partitions. This makes the |
d3374825 | 4268 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4269 | * remove it now. |
4270 | */ | |
4271 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
4272 | add_disk(disk); |
4273 | mddev->gendisk = disk; | |
ed9e1982 TH |
4274 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4275 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4276 | if (error) { |
4277 | /* This isn't possible, but as kobject_init_and_add is marked | |
4278 | * __must_check, we must do something with the result | |
4279 | */ | |
5e55e2f5 N |
4280 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4281 | disk->disk_name); | |
0909dc44 N |
4282 | error = 0; |
4283 | } | |
43a70507 N |
4284 | if (sysfs_create_group(&mddev->kobj, &md_bitmap_group)) |
4285 | printk(KERN_DEBUG "pointless warning\n"); | |
0909dc44 N |
4286 | abort: |
4287 | mutex_unlock(&disks_mutex); | |
4288 | if (!error) { | |
3830c62f | 4289 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
3ff195b0 | 4290 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, NULL, "array_state"); |
b62b7590 | 4291 | } |
d3374825 | 4292 | mddev_put(mddev); |
0909dc44 | 4293 | return error; |
efeb53c0 N |
4294 | } |
4295 | ||
4296 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4297 | { | |
4298 | md_alloc(dev, NULL); | |
1da177e4 LT |
4299 | return NULL; |
4300 | } | |
4301 | ||
efeb53c0 N |
4302 | static int add_named_array(const char *val, struct kernel_param *kp) |
4303 | { | |
4304 | /* val must be "md_*" where * is not all digits. | |
4305 | * We allocate an array with a large free minor number, and | |
4306 | * set the name to val. val must not already be an active name. | |
4307 | */ | |
4308 | int len = strlen(val); | |
4309 | char buf[DISK_NAME_LEN]; | |
4310 | ||
4311 | while (len && val[len-1] == '\n') | |
4312 | len--; | |
4313 | if (len >= DISK_NAME_LEN) | |
4314 | return -E2BIG; | |
4315 | strlcpy(buf, val, len+1); | |
4316 | if (strncmp(buf, "md_", 3) != 0) | |
4317 | return -EINVAL; | |
4318 | return md_alloc(0, buf); | |
4319 | } | |
4320 | ||
1da177e4 LT |
4321 | static void md_safemode_timeout(unsigned long data) |
4322 | { | |
4323 | mddev_t *mddev = (mddev_t *) data; | |
4324 | ||
0fd62b86 NB |
4325 | if (!atomic_read(&mddev->writes_pending)) { |
4326 | mddev->safemode = 1; | |
4327 | if (mddev->external) | |
b62b7590 | 4328 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 | 4329 | } |
1da177e4 LT |
4330 | md_wakeup_thread(mddev->thread); |
4331 | } | |
4332 | ||
6ff8d8ec | 4333 | static int start_dirty_degraded; |
1da177e4 | 4334 | |
fe60b014 | 4335 | static int md_run(mddev_t *mddev) |
1da177e4 | 4336 | { |
2604b703 | 4337 | int err; |
1da177e4 | 4338 | mdk_rdev_t *rdev; |
2604b703 | 4339 | struct mdk_personality *pers; |
1da177e4 | 4340 | |
a757e64c N |
4341 | if (list_empty(&mddev->disks)) |
4342 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4343 | return -EINVAL; |
1da177e4 LT |
4344 | |
4345 | if (mddev->pers) | |
4346 | return -EBUSY; | |
4347 | ||
b6eb127d N |
4348 | /* These two calls synchronise us with the |
4349 | * sysfs_remove_group calls in mddev_unlock, | |
4350 | * so they must have completed. | |
4351 | */ | |
4352 | mutex_lock(&mddev->open_mutex); | |
4353 | mutex_unlock(&mddev->open_mutex); | |
4354 | ||
1da177e4 LT |
4355 | /* |
4356 | * Analyze all RAID superblock(s) | |
4357 | */ | |
1ec4a939 N |
4358 | if (!mddev->raid_disks) { |
4359 | if (!mddev->persistent) | |
4360 | return -EINVAL; | |
a757e64c | 4361 | analyze_sbs(mddev); |
1ec4a939 | 4362 | } |
1da177e4 | 4363 | |
d9d166c2 N |
4364 | if (mddev->level != LEVEL_NONE) |
4365 | request_module("md-level-%d", mddev->level); | |
4366 | else if (mddev->clevel[0]) | |
4367 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4368 | |
4369 | /* | |
4370 | * Drop all container device buffers, from now on | |
4371 | * the only valid external interface is through the md | |
4372 | * device. | |
1da177e4 | 4373 | */ |
159ec1fc | 4374 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4375 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4376 | continue; |
4377 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4378 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4379 | |
4380 | /* perform some consistency tests on the device. | |
4381 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4382 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4383 | */ |
0f420358 | 4384 | if (rdev->data_offset < rdev->sb_start) { |
58c0fed4 AN |
4385 | if (mddev->dev_sectors && |
4386 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4387 | > rdev->sb_start) { |
f0d76d70 N |
4388 | printk("md: %s: data overlaps metadata\n", |
4389 | mdname(mddev)); | |
4390 | return -EINVAL; | |
4391 | } | |
4392 | } else { | |
0f420358 | 4393 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4394 | > rdev->data_offset) { |
4395 | printk("md: %s: metadata overlaps data\n", | |
4396 | mdname(mddev)); | |
4397 | return -EINVAL; | |
4398 | } | |
4399 | } | |
3c0ee63a | 4400 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
4401 | } |
4402 | ||
1da177e4 | 4403 | spin_lock(&pers_lock); |
d9d166c2 | 4404 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4405 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4406 | spin_unlock(&pers_lock); |
d9d166c2 N |
4407 | if (mddev->level != LEVEL_NONE) |
4408 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4409 | mddev->level); | |
4410 | else | |
4411 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4412 | mddev->clevel); | |
1da177e4 LT |
4413 | return -EINVAL; |
4414 | } | |
2604b703 | 4415 | mddev->pers = pers; |
1da177e4 | 4416 | spin_unlock(&pers_lock); |
34817e8c N |
4417 | if (mddev->level != pers->level) { |
4418 | mddev->level = pers->level; | |
4419 | mddev->new_level = pers->level; | |
4420 | } | |
d9d166c2 | 4421 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4422 | |
f6705578 | 4423 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4424 | pers->start_reshape == NULL) { |
f6705578 N |
4425 | /* This personality cannot handle reshaping... */ |
4426 | mddev->pers = NULL; | |
4427 | module_put(pers->owner); | |
4428 | return -EINVAL; | |
4429 | } | |
4430 | ||
7dd5e7c3 N |
4431 | if (pers->sync_request) { |
4432 | /* Warn if this is a potentially silly | |
4433 | * configuration. | |
4434 | */ | |
4435 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4436 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4437 | int warned = 0; |
159ec1fc CR |
4438 | |
4439 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4440 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4441 | if (rdev < rdev2 && |
4442 | rdev->bdev->bd_contains == | |
4443 | rdev2->bdev->bd_contains) { | |
4444 | printk(KERN_WARNING | |
4445 | "%s: WARNING: %s appears to be" | |
4446 | " on the same physical disk as" | |
4447 | " %s.\n", | |
4448 | mdname(mddev), | |
4449 | bdevname(rdev->bdev,b), | |
4450 | bdevname(rdev2->bdev,b2)); | |
4451 | warned = 1; | |
4452 | } | |
4453 | } | |
159ec1fc | 4454 | |
7dd5e7c3 N |
4455 | if (warned) |
4456 | printk(KERN_WARNING | |
4457 | "True protection against single-disk" | |
4458 | " failure might be compromised.\n"); | |
4459 | } | |
4460 | ||
657390d2 | 4461 | mddev->recovery = 0; |
58c0fed4 AN |
4462 | /* may be over-ridden by personality */ |
4463 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4464 | ||
a9701a30 | 4465 | mddev->barriers_work = 1; |
6ff8d8ec | 4466 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4467 | |
0f9552b5 | 4468 | if (start_readonly && mddev->ro == 0) |
f91de92e N |
4469 | mddev->ro = 2; /* read-only, but switch on first write */ |
4470 | ||
b15c2e57 | 4471 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4472 | if (err) |
4473 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4474 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4475 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4476 | " but 'external_size' not in effect?\n", __func__); | |
4477 | printk(KERN_ERR | |
4478 | "md: invalid array_size %llu > default size %llu\n", | |
4479 | (unsigned long long)mddev->array_sectors / 2, | |
4480 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4481 | err = -EINVAL; | |
4482 | mddev->pers->stop(mddev); | |
4483 | } | |
4484 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4485 | err = bitmap_create(mddev); |
4486 | if (err) { | |
4487 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4488 | mdname(mddev), err); | |
4489 | mddev->pers->stop(mddev); | |
4490 | } | |
4491 | } | |
1da177e4 | 4492 | if (err) { |
1da177e4 LT |
4493 | module_put(mddev->pers->owner); |
4494 | mddev->pers = NULL; | |
32a7627c N |
4495 | bitmap_destroy(mddev); |
4496 | return err; | |
1da177e4 | 4497 | } |
5e55e2f5 N |
4498 | if (mddev->pers->sync_request) { |
4499 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
4500 | printk(KERN_WARNING | |
4501 | "md: cannot register extra attributes for %s\n", | |
4502 | mdname(mddev)); | |
3ff195b0 | 4503 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, NULL, "sync_action"); |
5e55e2f5 | 4504 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4505 | mddev->ro = 0; |
4506 | ||
1da177e4 | 4507 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4508 | atomic_set(&mddev->max_corr_read_errors, |
4509 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4510 | mddev->safemode = 0; |
4511 | mddev->safemode_timer.function = md_safemode_timeout; | |
4512 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4513 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4514 | mddev->in_sync = 1; |
86e6ffdd | 4515 | |
159ec1fc | 4516 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4517 | if (rdev->raid_disk >= 0) { |
4518 | char nm[20]; | |
4519 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
4520 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
4521 | printk("md: cannot register %s for %s\n", | |
4522 | nm, mdname(mddev)); | |
86e6ffdd | 4523 | } |
1da177e4 LT |
4524 | |
4525 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4526 | ||
850b2b42 N |
4527 | if (mddev->flags) |
4528 | md_update_sb(mddev, 0); | |
1da177e4 | 4529 | |
0b8c9de0 N |
4530 | md_wakeup_thread(mddev->thread); |
4531 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 4532 | |
d7603b7e | 4533 | md_new_event(mddev); |
b62b7590 | 4534 | sysfs_notify_dirent(mddev->sysfs_state); |
0c3573f1 N |
4535 | if (mddev->sysfs_action) |
4536 | sysfs_notify_dirent(mddev->sysfs_action); | |
a99ac971 | 4537 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
1da177e4 LT |
4538 | return 0; |
4539 | } | |
4540 | ||
fe60b014 N |
4541 | static int do_md_run(mddev_t *mddev) |
4542 | { | |
4543 | int err; | |
4544 | ||
4545 | err = md_run(mddev); | |
4546 | if (err) | |
4547 | goto out; | |
4548 | ||
4549 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
4550 | revalidate_disk(mddev->gendisk); | |
4551 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); | |
4552 | out: | |
4553 | return err; | |
4554 | } | |
4555 | ||
1da177e4 LT |
4556 | static int restart_array(mddev_t *mddev) |
4557 | { | |
4558 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4559 | |
80fab1d7 | 4560 | /* Complain if it has no devices */ |
1da177e4 | 4561 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4562 | return -ENXIO; |
4563 | if (!mddev->pers) | |
4564 | return -EINVAL; | |
4565 | if (!mddev->ro) | |
4566 | return -EBUSY; | |
4567 | mddev->safemode = 0; | |
4568 | mddev->ro = 0; | |
4569 | set_disk_ro(disk, 0); | |
4570 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4571 | mdname(mddev)); | |
4572 | /* Kick recovery or resync if necessary */ | |
4573 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4574 | md_wakeup_thread(mddev->thread); | |
4575 | md_wakeup_thread(mddev->sync_thread); | |
b62b7590 | 4576 | sysfs_notify_dirent(mddev->sysfs_state); |
80fab1d7 | 4577 | return 0; |
1da177e4 LT |
4578 | } |
4579 | ||
acc55e22 N |
4580 | /* similar to deny_write_access, but accounts for our holding a reference |
4581 | * to the file ourselves */ | |
4582 | static int deny_bitmap_write_access(struct file * file) | |
4583 | { | |
4584 | struct inode *inode = file->f_mapping->host; | |
4585 | ||
4586 | spin_lock(&inode->i_lock); | |
4587 | if (atomic_read(&inode->i_writecount) > 1) { | |
4588 | spin_unlock(&inode->i_lock); | |
4589 | return -ETXTBSY; | |
4590 | } | |
4591 | atomic_set(&inode->i_writecount, -1); | |
4592 | spin_unlock(&inode->i_lock); | |
4593 | ||
4594 | return 0; | |
4595 | } | |
4596 | ||
43a70507 | 4597 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4598 | { |
4599 | struct inode *inode = file->f_mapping->host; | |
4600 | ||
4601 | spin_lock(&inode->i_lock); | |
4602 | atomic_set(&inode->i_writecount, 1); | |
4603 | spin_unlock(&inode->i_lock); | |
4604 | } | |
4605 | ||
6177b472 N |
4606 | static void md_clean(mddev_t *mddev) |
4607 | { | |
4608 | mddev->array_sectors = 0; | |
4609 | mddev->external_size = 0; | |
4610 | mddev->dev_sectors = 0; | |
4611 | mddev->raid_disks = 0; | |
4612 | mddev->recovery_cp = 0; | |
4613 | mddev->resync_min = 0; | |
4614 | mddev->resync_max = MaxSector; | |
4615 | mddev->reshape_position = MaxSector; | |
4616 | mddev->external = 0; | |
4617 | mddev->persistent = 0; | |
4618 | mddev->level = LEVEL_NONE; | |
4619 | mddev->clevel[0] = 0; | |
4620 | mddev->flags = 0; | |
4621 | mddev->ro = 0; | |
4622 | mddev->metadata_type[0] = 0; | |
4623 | mddev->chunk_sectors = 0; | |
4624 | mddev->ctime = mddev->utime = 0; | |
4625 | mddev->layout = 0; | |
4626 | mddev->max_disks = 0; | |
4627 | mddev->events = 0; | |
a8707c08 | 4628 | mddev->can_decrease_events = 0; |
6177b472 N |
4629 | mddev->delta_disks = 0; |
4630 | mddev->new_level = LEVEL_NONE; | |
4631 | mddev->new_layout = 0; | |
4632 | mddev->new_chunk_sectors = 0; | |
4633 | mddev->curr_resync = 0; | |
4634 | mddev->resync_mismatches = 0; | |
4635 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4636 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4637 | mddev->recovery = 0; | |
4638 | mddev->in_sync = 0; | |
4639 | mddev->degraded = 0; | |
4640 | mddev->barriers_work = 0; | |
4641 | mddev->safemode = 0; | |
4642 | mddev->bitmap_info.offset = 0; | |
4643 | mddev->bitmap_info.default_offset = 0; | |
4644 | mddev->bitmap_info.chunksize = 0; | |
4645 | mddev->bitmap_info.daemon_sleep = 0; | |
4646 | mddev->bitmap_info.max_write_behind = 0; | |
4647 | } | |
4648 | ||
a047e125 N |
4649 | static void md_stop_writes(mddev_t *mddev) |
4650 | { | |
4651 | if (mddev->sync_thread) { | |
4652 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4653 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4654 | md_unregister_thread(mddev->sync_thread); | |
4655 | mddev->sync_thread = NULL; | |
4656 | } | |
4657 | ||
4658 | del_timer_sync(&mddev->safemode_timer); | |
4659 | ||
4660 | bitmap_flush(mddev); | |
4661 | md_super_wait(mddev); | |
4662 | ||
4663 | if (!mddev->in_sync || mddev->flags) { | |
4664 | /* mark array as shutdown cleanly */ | |
4665 | mddev->in_sync = 1; | |
4666 | md_update_sb(mddev, 1); | |
4667 | } | |
4668 | } | |
4669 | ||
6177b472 N |
4670 | static void md_stop(mddev_t *mddev) |
4671 | { | |
cca9cf90 N |
4672 | md_stop_writes(mddev); |
4673 | ||
6177b472 N |
4674 | mddev->pers->stop(mddev); |
4675 | if (mddev->pers->sync_request && mddev->to_remove == NULL) | |
4676 | mddev->to_remove = &md_redundancy_group; | |
4677 | module_put(mddev->pers->owner); | |
4678 | mddev->pers = NULL; | |
cca9cf90 | 4679 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
6177b472 N |
4680 | } |
4681 | ||
a4bd82d0 N |
4682 | static int md_set_readonly(mddev_t *mddev, int is_open) |
4683 | { | |
4684 | int err = 0; | |
4685 | mutex_lock(&mddev->open_mutex); | |
4686 | if (atomic_read(&mddev->openers) > is_open) { | |
4687 | printk("md: %s still in use.\n",mdname(mddev)); | |
4688 | err = -EBUSY; | |
4689 | goto out; | |
4690 | } | |
4691 | if (mddev->pers) { | |
4692 | md_stop_writes(mddev); | |
4693 | ||
4694 | err = -ENXIO; | |
4695 | if (mddev->ro==1) | |
4696 | goto out; | |
4697 | mddev->ro = 1; | |
4698 | set_disk_ro(mddev->gendisk, 1); | |
4699 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
4700 | sysfs_notify_dirent(mddev->sysfs_state); | |
4701 | err = 0; | |
4702 | } | |
4703 | out: | |
4704 | mutex_unlock(&mddev->open_mutex); | |
4705 | return err; | |
4706 | } | |
4707 | ||
9e653b63 N |
4708 | /* mode: |
4709 | * 0 - completely stop and dis-assemble array | |
9e653b63 N |
4710 | * 2 - stop but do not disassemble array |
4711 | */ | |
df5b20cf | 4712 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
4713 | { |
4714 | int err = 0; | |
4715 | struct gendisk *disk = mddev->gendisk; | |
c4647292 | 4716 | mdk_rdev_t *rdev; |
1da177e4 | 4717 | |
c8c00a69 | 4718 | mutex_lock(&mddev->open_mutex); |
f2ea68cf | 4719 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf | 4720 | printk("md: %s still in use.\n",mdname(mddev)); |
c8c00a69 N |
4721 | err = -EBUSY; |
4722 | } else if (mddev->pers) { | |
1da177e4 | 4723 | |
a4bd82d0 N |
4724 | if (mddev->ro) |
4725 | set_disk_ro(disk, 0); | |
409c57f3 | 4726 | |
a4bd82d0 N |
4727 | md_stop(mddev); |
4728 | mddev->queue->merge_bvec_fn = NULL; | |
4729 | mddev->queue->unplug_fn = NULL; | |
4730 | mddev->queue->backing_dev_info.congested_fn = NULL; | |
6177b472 | 4731 | |
a4bd82d0 N |
4732 | /* tell userspace to handle 'inactive' */ |
4733 | sysfs_notify_dirent(mddev->sysfs_state); | |
0d4ca600 | 4734 | |
a4bd82d0 N |
4735 | list_for_each_entry(rdev, &mddev->disks, same_set) |
4736 | if (rdev->raid_disk >= 0) { | |
4737 | char nm[20]; | |
4738 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4739 | sysfs_remove_link(&mddev->kobj, nm); | |
4740 | } | |
c4647292 | 4741 | |
a4bd82d0 N |
4742 | set_capacity(disk, 0); |
4743 | revalidate_disk(disk); | |
0d4ca600 | 4744 | |
a4bd82d0 N |
4745 | if (mddev->ro) |
4746 | mddev->ro = 0; | |
4747 | ||
80ffb3cc | 4748 | err = 0; |
1da177e4 | 4749 | } |
c8c00a69 N |
4750 | mutex_unlock(&mddev->open_mutex); |
4751 | if (err) | |
4752 | return err; | |
1da177e4 LT |
4753 | /* |
4754 | * Free resources if final stop | |
4755 | */ | |
9e653b63 | 4756 | if (mode == 0) { |
0d4ca600 | 4757 | |
1da177e4 LT |
4758 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4759 | ||
978f946b | 4760 | bitmap_destroy(mddev); |
c3d9714e N |
4761 | if (mddev->bitmap_info.file) { |
4762 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
4763 | fput(mddev->bitmap_info.file); | |
4764 | mddev->bitmap_info.file = NULL; | |
978f946b | 4765 | } |
c3d9714e | 4766 | mddev->bitmap_info.offset = 0; |
978f946b | 4767 | |
1da177e4 LT |
4768 | export_array(mddev); |
4769 | ||
6177b472 | 4770 | md_clean(mddev); |
934d9c23 | 4771 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4772 | if (mddev->hold_active == UNTIL_STOP) |
4773 | mddev->hold_active = 0; | |
9e653b63 | 4774 | |
a4bd82d0 | 4775 | } |
1da177e4 | 4776 | err = 0; |
3f9d99c1 | 4777 | blk_integrity_unregister(disk); |
d7603b7e | 4778 | md_new_event(mddev); |
b62b7590 | 4779 | sysfs_notify_dirent(mddev->sysfs_state); |
1da177e4 LT |
4780 | return err; |
4781 | } | |
4782 | ||
fdee8ae4 | 4783 | #ifndef MODULE |
1da177e4 LT |
4784 | static void autorun_array(mddev_t *mddev) |
4785 | { | |
4786 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4787 | int err; |
4788 | ||
a757e64c | 4789 | if (list_empty(&mddev->disks)) |
1da177e4 | 4790 | return; |
1da177e4 LT |
4791 | |
4792 | printk(KERN_INFO "md: running: "); | |
4793 | ||
159ec1fc | 4794 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4795 | char b[BDEVNAME_SIZE]; |
4796 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4797 | } | |
4798 | printk("\n"); | |
4799 | ||
d710e138 | 4800 | err = do_md_run(mddev); |
1da177e4 LT |
4801 | if (err) { |
4802 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4803 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4804 | } |
4805 | } | |
4806 | ||
4807 | /* | |
4808 | * lets try to run arrays based on all disks that have arrived | |
4809 | * until now. (those are in pending_raid_disks) | |
4810 | * | |
4811 | * the method: pick the first pending disk, collect all disks with | |
4812 | * the same UUID, remove all from the pending list and put them into | |
4813 | * the 'same_array' list. Then order this list based on superblock | |
4814 | * update time (freshest comes first), kick out 'old' disks and | |
4815 | * compare superblocks. If everything's fine then run it. | |
4816 | * | |
4817 | * If "unit" is allocated, then bump its reference count | |
4818 | */ | |
4819 | static void autorun_devices(int part) | |
4820 | { | |
159ec1fc | 4821 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4822 | mddev_t *mddev; |
4823 | char b[BDEVNAME_SIZE]; | |
4824 | ||
4825 | printk(KERN_INFO "md: autorun ...\n"); | |
4826 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4827 | int unit; |
1da177e4 | 4828 | dev_t dev; |
ad01c9e3 | 4829 | LIST_HEAD(candidates); |
1da177e4 LT |
4830 | rdev0 = list_entry(pending_raid_disks.next, |
4831 | mdk_rdev_t, same_set); | |
4832 | ||
4833 | printk(KERN_INFO "md: considering %s ...\n", | |
4834 | bdevname(rdev0->bdev,b)); | |
4835 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4836 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4837 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4838 | printk(KERN_INFO "md: adding %s ...\n", | |
4839 | bdevname(rdev->bdev,b)); | |
4840 | list_move(&rdev->same_set, &candidates); | |
4841 | } | |
4842 | /* | |
4843 | * now we have a set of devices, with all of them having | |
4844 | * mostly sane superblocks. It's time to allocate the | |
4845 | * mddev. | |
4846 | */ | |
e8703fe1 N |
4847 | if (part) { |
4848 | dev = MKDEV(mdp_major, | |
4849 | rdev0->preferred_minor << MdpMinorShift); | |
4850 | unit = MINOR(dev) >> MdpMinorShift; | |
4851 | } else { | |
4852 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4853 | unit = MINOR(dev); | |
4854 | } | |
4855 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4856 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4857 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4858 | break; | |
4859 | } | |
1da177e4 LT |
4860 | |
4861 | md_probe(dev, NULL, NULL); | |
4862 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4863 | if (!mddev || !mddev->gendisk) { |
4864 | if (mddev) | |
4865 | mddev_put(mddev); | |
4866 | printk(KERN_ERR | |
1da177e4 LT |
4867 | "md: cannot allocate memory for md drive.\n"); |
4868 | break; | |
4869 | } | |
4870 | if (mddev_lock(mddev)) | |
4871 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4872 | mdname(mddev)); | |
4873 | else if (mddev->raid_disks || mddev->major_version | |
4874 | || !list_empty(&mddev->disks)) { | |
4875 | printk(KERN_WARNING | |
4876 | "md: %s already running, cannot run %s\n", | |
4877 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4878 | mddev_unlock(mddev); | |
4879 | } else { | |
4880 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4881 | mddev->persistent = 1; |
159ec1fc | 4882 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4883 | list_del_init(&rdev->same_set); |
4884 | if (bind_rdev_to_array(rdev, mddev)) | |
4885 | export_rdev(rdev); | |
4886 | } | |
4887 | autorun_array(mddev); | |
4888 | mddev_unlock(mddev); | |
4889 | } | |
4890 | /* on success, candidates will be empty, on error | |
4891 | * it won't... | |
4892 | */ | |
159ec1fc | 4893 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4894 | list_del_init(&rdev->same_set); |
1da177e4 | 4895 | export_rdev(rdev); |
4b80991c | 4896 | } |
1da177e4 LT |
4897 | mddev_put(mddev); |
4898 | } | |
4899 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4900 | } | |
fdee8ae4 | 4901 | #endif /* !MODULE */ |
1da177e4 | 4902 | |
1da177e4 LT |
4903 | static int get_version(void __user * arg) |
4904 | { | |
4905 | mdu_version_t ver; | |
4906 | ||
4907 | ver.major = MD_MAJOR_VERSION; | |
4908 | ver.minor = MD_MINOR_VERSION; | |
4909 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4910 | ||
4911 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4912 | return -EFAULT; | |
4913 | ||
4914 | return 0; | |
4915 | } | |
4916 | ||
4917 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4918 | { | |
4919 | mdu_array_info_t info; | |
a9f326eb | 4920 | int nr,working,insync,failed,spare; |
1da177e4 | 4921 | mdk_rdev_t *rdev; |
1da177e4 | 4922 | |
a9f326eb | 4923 | nr=working=insync=failed=spare=0; |
159ec1fc | 4924 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4925 | nr++; |
b2d444d7 | 4926 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4927 | failed++; |
4928 | else { | |
4929 | working++; | |
b2d444d7 | 4930 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 4931 | insync++; |
1da177e4 LT |
4932 | else |
4933 | spare++; | |
4934 | } | |
4935 | } | |
4936 | ||
4937 | info.major_version = mddev->major_version; | |
4938 | info.minor_version = mddev->minor_version; | |
4939 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4940 | info.ctime = mddev->ctime; | |
4941 | info.level = mddev->level; | |
58c0fed4 AN |
4942 | info.size = mddev->dev_sectors / 2; |
4943 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 4944 | info.size = -1; |
1da177e4 LT |
4945 | info.nr_disks = nr; |
4946 | info.raid_disks = mddev->raid_disks; | |
4947 | info.md_minor = mddev->md_minor; | |
4948 | info.not_persistent= !mddev->persistent; | |
4949 | ||
4950 | info.utime = mddev->utime; | |
4951 | info.state = 0; | |
4952 | if (mddev->in_sync) | |
4953 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 4954 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 4955 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 4956 | info.active_disks = insync; |
1da177e4 LT |
4957 | info.working_disks = working; |
4958 | info.failed_disks = failed; | |
4959 | info.spare_disks = spare; | |
4960 | ||
4961 | info.layout = mddev->layout; | |
9d8f0363 | 4962 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
4963 | |
4964 | if (copy_to_user(arg, &info, sizeof(info))) | |
4965 | return -EFAULT; | |
4966 | ||
4967 | return 0; | |
4968 | } | |
4969 | ||
87162a28 | 4970 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4971 | { |
4972 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4973 | char *ptr, *buf = NULL; | |
4974 | int err = -ENOMEM; | |
4975 | ||
b5470dc5 DW |
4976 | if (md_allow_write(mddev)) |
4977 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4978 | else | |
4979 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4980 | |
32a7627c N |
4981 | if (!file) |
4982 | goto out; | |
4983 | ||
4984 | /* bitmap disabled, zero the first byte and copy out */ | |
4985 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4986 | file->pathname[0] = '\0'; | |
4987 | goto copy_out; | |
4988 | } | |
4989 | ||
4990 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4991 | if (!buf) | |
4992 | goto out; | |
4993 | ||
6bcfd601 CH |
4994 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4995 | if (IS_ERR(ptr)) | |
32a7627c N |
4996 | goto out; |
4997 | ||
4998 | strcpy(file->pathname, ptr); | |
4999 | ||
5000 | copy_out: | |
5001 | err = 0; | |
5002 | if (copy_to_user(arg, file, sizeof(*file))) | |
5003 | err = -EFAULT; | |
5004 | out: | |
5005 | kfree(buf); | |
5006 | kfree(file); | |
5007 | return err; | |
5008 | } | |
5009 | ||
1da177e4 LT |
5010 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
5011 | { | |
5012 | mdu_disk_info_t info; | |
1da177e4 LT |
5013 | mdk_rdev_t *rdev; |
5014 | ||
5015 | if (copy_from_user(&info, arg, sizeof(info))) | |
5016 | return -EFAULT; | |
5017 | ||
26ef379f | 5018 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
5019 | if (rdev) { |
5020 | info.major = MAJOR(rdev->bdev->bd_dev); | |
5021 | info.minor = MINOR(rdev->bdev->bd_dev); | |
5022 | info.raid_disk = rdev->raid_disk; | |
5023 | info.state = 0; | |
b2d444d7 | 5024 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5025 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 5026 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
5027 | info.state |= (1<<MD_DISK_ACTIVE); |
5028 | info.state |= (1<<MD_DISK_SYNC); | |
5029 | } | |
8ddf9efe N |
5030 | if (test_bit(WriteMostly, &rdev->flags)) |
5031 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
5032 | } else { |
5033 | info.major = info.minor = 0; | |
5034 | info.raid_disk = -1; | |
5035 | info.state = (1<<MD_DISK_REMOVED); | |
5036 | } | |
5037 | ||
5038 | if (copy_to_user(arg, &info, sizeof(info))) | |
5039 | return -EFAULT; | |
5040 | ||
5041 | return 0; | |
5042 | } | |
5043 | ||
5044 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
5045 | { | |
5046 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
5047 | mdk_rdev_t *rdev; | |
5048 | dev_t dev = MKDEV(info->major,info->minor); | |
5049 | ||
5050 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
5051 | return -EOVERFLOW; | |
5052 | ||
5053 | if (!mddev->raid_disks) { | |
5054 | int err; | |
5055 | /* expecting a device which has a superblock */ | |
5056 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
5057 | if (IS_ERR(rdev)) { | |
5058 | printk(KERN_WARNING | |
5059 | "md: md_import_device returned %ld\n", | |
5060 | PTR_ERR(rdev)); | |
5061 | return PTR_ERR(rdev); | |
5062 | } | |
5063 | if (!list_empty(&mddev->disks)) { | |
5064 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
5065 | mdk_rdev_t, same_set); | |
a9f326eb | 5066 | err = super_types[mddev->major_version] |
1da177e4 LT |
5067 | .load_super(rdev, rdev0, mddev->minor_version); |
5068 | if (err < 0) { | |
5069 | printk(KERN_WARNING | |
5070 | "md: %s has different UUID to %s\n", | |
5071 | bdevname(rdev->bdev,b), | |
5072 | bdevname(rdev0->bdev,b2)); | |
5073 | export_rdev(rdev); | |
5074 | return -EINVAL; | |
5075 | } | |
5076 | } | |
5077 | err = bind_rdev_to_array(rdev, mddev); | |
5078 | if (err) | |
5079 | export_rdev(rdev); | |
5080 | return err; | |
5081 | } | |
5082 | ||
5083 | /* | |
5084 | * add_new_disk can be used once the array is assembled | |
5085 | * to add "hot spares". They must already have a superblock | |
5086 | * written | |
5087 | */ | |
5088 | if (mddev->pers) { | |
5089 | int err; | |
5090 | if (!mddev->pers->hot_add_disk) { | |
5091 | printk(KERN_WARNING | |
5092 | "%s: personality does not support diskops!\n", | |
5093 | mdname(mddev)); | |
5094 | return -EINVAL; | |
5095 | } | |
7b1e35f6 N |
5096 | if (mddev->persistent) |
5097 | rdev = md_import_device(dev, mddev->major_version, | |
5098 | mddev->minor_version); | |
5099 | else | |
5100 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
5101 | if (IS_ERR(rdev)) { |
5102 | printk(KERN_WARNING | |
5103 | "md: md_import_device returned %ld\n", | |
5104 | PTR_ERR(rdev)); | |
5105 | return PTR_ERR(rdev); | |
5106 | } | |
41158c7e N |
5107 | /* set save_raid_disk if appropriate */ |
5108 | if (!mddev->persistent) { | |
5109 | if (info->state & (1<<MD_DISK_SYNC) && | |
5110 | info->raid_disk < mddev->raid_disks) | |
5111 | rdev->raid_disk = info->raid_disk; | |
5112 | else | |
5113 | rdev->raid_disk = -1; | |
5114 | } else | |
5115 | super_types[mddev->major_version]. | |
5116 | validate_super(mddev, rdev); | |
5117 | rdev->saved_raid_disk = rdev->raid_disk; | |
5118 | ||
b2d444d7 | 5119 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
5120 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5121 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
5122 | else |
5123 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 5124 | |
1da177e4 LT |
5125 | rdev->raid_disk = -1; |
5126 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
5127 | if (!err && !mddev->pers->hot_remove_disk) { |
5128 | /* If there is hot_add_disk but no hot_remove_disk | |
5129 | * then added disks for geometry changes, | |
5130 | * and should be added immediately. | |
5131 | */ | |
5132 | super_types[mddev->major_version]. | |
5133 | validate_super(mddev, rdev); | |
5134 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
5135 | if (err) | |
5136 | unbind_rdev_from_array(rdev); | |
5137 | } | |
1da177e4 LT |
5138 | if (err) |
5139 | export_rdev(rdev); | |
52664732 | 5140 | else |
3c0ee63a | 5141 | sysfs_notify_dirent(rdev->sysfs_state); |
c361777f | 5142 | |
17571284 | 5143 | md_update_sb(mddev, 1); |
72a23c21 NB |
5144 | if (mddev->degraded) |
5145 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 5146 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 5147 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
5148 | return err; |
5149 | } | |
5150 | ||
5151 | /* otherwise, add_new_disk is only allowed | |
5152 | * for major_version==0 superblocks | |
5153 | */ | |
5154 | if (mddev->major_version != 0) { | |
5155 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5156 | mdname(mddev)); | |
5157 | return -EINVAL; | |
5158 | } | |
5159 | ||
5160 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5161 | int err; | |
d710e138 | 5162 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5163 | if (IS_ERR(rdev)) { |
5164 | printk(KERN_WARNING | |
5165 | "md: error, md_import_device() returned %ld\n", | |
5166 | PTR_ERR(rdev)); | |
5167 | return PTR_ERR(rdev); | |
5168 | } | |
5169 | rdev->desc_nr = info->number; | |
5170 | if (info->raid_disk < mddev->raid_disks) | |
5171 | rdev->raid_disk = info->raid_disk; | |
5172 | else | |
5173 | rdev->raid_disk = -1; | |
5174 | ||
1da177e4 | 5175 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5176 | if (info->state & (1<<MD_DISK_SYNC)) |
5177 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5178 | |
8ddf9efe N |
5179 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5180 | set_bit(WriteMostly, &rdev->flags); | |
5181 | ||
1da177e4 LT |
5182 | if (!mddev->persistent) { |
5183 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 5184 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 5185 | } else |
0f420358 | 5186 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
8190e754 | 5187 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5188 | |
2bf071bf N |
5189 | err = bind_rdev_to_array(rdev, mddev); |
5190 | if (err) { | |
5191 | export_rdev(rdev); | |
5192 | return err; | |
5193 | } | |
1da177e4 LT |
5194 | } |
5195 | ||
5196 | return 0; | |
5197 | } | |
5198 | ||
5199 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5200 | { | |
5201 | char b[BDEVNAME_SIZE]; | |
5202 | mdk_rdev_t *rdev; | |
5203 | ||
1da177e4 LT |
5204 | rdev = find_rdev(mddev, dev); |
5205 | if (!rdev) | |
5206 | return -ENXIO; | |
5207 | ||
5208 | if (rdev->raid_disk >= 0) | |
5209 | goto busy; | |
5210 | ||
5211 | kick_rdev_from_array(rdev); | |
850b2b42 | 5212 | md_update_sb(mddev, 1); |
d7603b7e | 5213 | md_new_event(mddev); |
1da177e4 LT |
5214 | |
5215 | return 0; | |
5216 | busy: | |
fdefa4d8 | 5217 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5218 | bdevname(rdev->bdev,b), mdname(mddev)); |
5219 | return -EBUSY; | |
5220 | } | |
5221 | ||
5222 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5223 | { | |
5224 | char b[BDEVNAME_SIZE]; | |
5225 | int err; | |
1da177e4 LT |
5226 | mdk_rdev_t *rdev; |
5227 | ||
5228 | if (!mddev->pers) | |
5229 | return -ENODEV; | |
5230 | ||
5231 | if (mddev->major_version != 0) { | |
5232 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5233 | " version-0 superblocks.\n", | |
5234 | mdname(mddev)); | |
5235 | return -EINVAL; | |
5236 | } | |
5237 | if (!mddev->pers->hot_add_disk) { | |
5238 | printk(KERN_WARNING | |
5239 | "%s: personality does not support diskops!\n", | |
5240 | mdname(mddev)); | |
5241 | return -EINVAL; | |
5242 | } | |
5243 | ||
d710e138 | 5244 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5245 | if (IS_ERR(rdev)) { |
5246 | printk(KERN_WARNING | |
5247 | "md: error, md_import_device() returned %ld\n", | |
5248 | PTR_ERR(rdev)); | |
5249 | return -EINVAL; | |
5250 | } | |
5251 | ||
5252 | if (mddev->persistent) | |
0f420358 | 5253 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 5254 | else |
0f420358 | 5255 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 5256 | |
8190e754 | 5257 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5258 | |
b2d444d7 | 5259 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5260 | printk(KERN_WARNING |
5261 | "md: can not hot-add faulty %s disk to %s!\n", | |
5262 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5263 | err = -EINVAL; | |
5264 | goto abort_export; | |
5265 | } | |
b2d444d7 | 5266 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5267 | rdev->desc_nr = -1; |
5842730d | 5268 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5269 | err = bind_rdev_to_array(rdev, mddev); |
5270 | if (err) | |
5271 | goto abort_export; | |
1da177e4 LT |
5272 | |
5273 | /* | |
5274 | * The rest should better be atomic, we can have disk failures | |
5275 | * noticed in interrupt contexts ... | |
5276 | */ | |
5277 | ||
1da177e4 LT |
5278 | rdev->raid_disk = -1; |
5279 | ||
850b2b42 | 5280 | md_update_sb(mddev, 1); |
1da177e4 LT |
5281 | |
5282 | /* | |
5283 | * Kick recovery, maybe this spare has to be added to the | |
5284 | * array immediately. | |
5285 | */ | |
5286 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5287 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5288 | md_new_event(mddev); |
1da177e4 LT |
5289 | return 0; |
5290 | ||
1da177e4 LT |
5291 | abort_export: |
5292 | export_rdev(rdev); | |
5293 | return err; | |
5294 | } | |
5295 | ||
32a7627c N |
5296 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5297 | { | |
5298 | int err; | |
5299 | ||
36fa3063 N |
5300 | if (mddev->pers) { |
5301 | if (!mddev->pers->quiesce) | |
5302 | return -EBUSY; | |
5303 | if (mddev->recovery || mddev->sync_thread) | |
5304 | return -EBUSY; | |
5305 | /* we should be able to change the bitmap.. */ | |
5306 | } | |
32a7627c | 5307 | |
32a7627c | 5308 | |
36fa3063 N |
5309 | if (fd >= 0) { |
5310 | if (mddev->bitmap) | |
5311 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5312 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5313 | |
c3d9714e | 5314 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5315 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5316 | mdname(mddev)); | |
5317 | return -EBADF; | |
5318 | } | |
5319 | ||
c3d9714e | 5320 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5321 | if (err) { |
5322 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5323 | mdname(mddev)); | |
c3d9714e N |
5324 | fput(mddev->bitmap_info.file); |
5325 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5326 | return err; |
5327 | } | |
c3d9714e | 5328 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5329 | } else if (mddev->bitmap == NULL) |
5330 | return -ENOENT; /* cannot remove what isn't there */ | |
5331 | err = 0; | |
5332 | if (mddev->pers) { | |
5333 | mddev->pers->quiesce(mddev, 1); | |
5334 | if (fd >= 0) | |
5335 | err = bitmap_create(mddev); | |
d7375ab3 | 5336 | if (fd < 0 || err) { |
36fa3063 | 5337 | bitmap_destroy(mddev); |
d7375ab3 N |
5338 | fd = -1; /* make sure to put the file */ |
5339 | } | |
36fa3063 | 5340 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5341 | } |
5342 | if (fd < 0) { | |
c3d9714e N |
5343 | if (mddev->bitmap_info.file) { |
5344 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5345 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5346 | } |
c3d9714e | 5347 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5348 | } |
5349 | ||
32a7627c N |
5350 | return err; |
5351 | } | |
5352 | ||
1da177e4 LT |
5353 | /* |
5354 | * set_array_info is used two different ways | |
5355 | * The original usage is when creating a new array. | |
5356 | * In this usage, raid_disks is > 0 and it together with | |
5357 | * level, size, not_persistent,layout,chunksize determine the | |
5358 | * shape of the array. | |
5359 | * This will always create an array with a type-0.90.0 superblock. | |
5360 | * The newer usage is when assembling an array. | |
5361 | * In this case raid_disks will be 0, and the major_version field is | |
5362 | * use to determine which style super-blocks are to be found on the devices. | |
5363 | * The minor and patch _version numbers are also kept incase the | |
5364 | * super_block handler wishes to interpret them. | |
5365 | */ | |
5366 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5367 | { | |
5368 | ||
5369 | if (info->raid_disks == 0) { | |
5370 | /* just setting version number for superblock loading */ | |
5371 | if (info->major_version < 0 || | |
50511da3 | 5372 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5373 | super_types[info->major_version].name == NULL) { |
5374 | /* maybe try to auto-load a module? */ | |
5375 | printk(KERN_INFO | |
5376 | "md: superblock version %d not known\n", | |
5377 | info->major_version); | |
5378 | return -EINVAL; | |
5379 | } | |
5380 | mddev->major_version = info->major_version; | |
5381 | mddev->minor_version = info->minor_version; | |
5382 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5383 | mddev->persistent = !info->not_persistent; |
cbd19983 N |
5384 | /* ensure mddev_put doesn't delete this now that there |
5385 | * is some minimal configuration. | |
5386 | */ | |
5387 | mddev->ctime = get_seconds(); | |
1da177e4 LT |
5388 | return 0; |
5389 | } | |
5390 | mddev->major_version = MD_MAJOR_VERSION; | |
5391 | mddev->minor_version = MD_MINOR_VERSION; | |
5392 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5393 | mddev->ctime = get_seconds(); | |
5394 | ||
5395 | mddev->level = info->level; | |
17115e03 | 5396 | mddev->clevel[0] = 0; |
58c0fed4 | 5397 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5398 | mddev->raid_disks = info->raid_disks; |
5399 | /* don't set md_minor, it is determined by which /dev/md* was | |
5400 | * openned | |
5401 | */ | |
5402 | if (info->state & (1<<MD_SB_CLEAN)) | |
5403 | mddev->recovery_cp = MaxSector; | |
5404 | else | |
5405 | mddev->recovery_cp = 0; | |
5406 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5407 | mddev->external = 0; |
1da177e4 LT |
5408 | |
5409 | mddev->layout = info->layout; | |
9d8f0363 | 5410 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5411 | |
5412 | mddev->max_disks = MD_SB_DISKS; | |
5413 | ||
e691063a N |
5414 | if (mddev->persistent) |
5415 | mddev->flags = 0; | |
850b2b42 | 5416 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5417 | |
c3d9714e N |
5418 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5419 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5420 | |
f6705578 N |
5421 | mddev->reshape_position = MaxSector; |
5422 | ||
1da177e4 LT |
5423 | /* |
5424 | * Generate a 128 bit UUID | |
5425 | */ | |
5426 | get_random_bytes(mddev->uuid, 16); | |
5427 | ||
f6705578 | 5428 | mddev->new_level = mddev->level; |
664e7c41 | 5429 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5430 | mddev->new_layout = mddev->layout; |
5431 | mddev->delta_disks = 0; | |
5432 | ||
1da177e4 LT |
5433 | return 0; |
5434 | } | |
5435 | ||
1f403624 DW |
5436 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5437 | { | |
b522adcd DW |
5438 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5439 | ||
5440 | if (mddev->external_size) | |
5441 | return; | |
5442 | ||
1f403624 DW |
5443 | mddev->array_sectors = array_sectors; |
5444 | } | |
5445 | EXPORT_SYMBOL(md_set_array_sectors); | |
5446 | ||
d71f9f88 | 5447 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5448 | { |
159ec1fc | 5449 | mdk_rdev_t *rdev; |
a35b0d69 | 5450 | int rv; |
d71f9f88 | 5451 | int fit = (num_sectors == 0); |
a35b0d69 N |
5452 | |
5453 | if (mddev->pers->resize == NULL) | |
5454 | return -EINVAL; | |
d71f9f88 AN |
5455 | /* The "num_sectors" is the number of sectors of each device that |
5456 | * is used. This can only make sense for arrays with redundancy. | |
5457 | * linear and raid0 always use whatever space is available. We can only | |
5458 | * consider changing this number if no resync or reconstruction is | |
5459 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5460 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5461 | * of each device. If num_sectors is zero, we find the largest size |
5462 | * that fits. | |
5463 | ||
a35b0d69 N |
5464 | */ |
5465 | if (mddev->sync_thread) | |
5466 | return -EBUSY; | |
dba034ee N |
5467 | if (mddev->bitmap) |
5468 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5469 | * grow, and re-add. | |
5470 | */ | |
5471 | return -EBUSY; | |
159ec1fc | 5472 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5473 | sector_t avail = rdev->sectors; |
01ab5662 | 5474 | |
d71f9f88 AN |
5475 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5476 | num_sectors = avail; | |
5477 | if (avail < num_sectors) | |
a35b0d69 N |
5478 | return -ENOSPC; |
5479 | } | |
d71f9f88 | 5480 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5481 | if (!rv) |
5482 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5483 | return rv; |
5484 | } | |
5485 | ||
da943b99 N |
5486 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5487 | { | |
5488 | int rv; | |
5489 | /* change the number of raid disks */ | |
63c70c4f | 5490 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5491 | return -EINVAL; |
5492 | if (raid_disks <= 0 || | |
233fca36 | 5493 | (mddev->max_disks && raid_disks >= mddev->max_disks)) |
da943b99 | 5494 | return -EINVAL; |
63c70c4f | 5495 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5496 | return -EBUSY; |
63c70c4f N |
5497 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5498 | ||
5499 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
5500 | return rv; |
5501 | } | |
5502 | ||
5503 | ||
1da177e4 LT |
5504 | /* |
5505 | * update_array_info is used to change the configuration of an | |
5506 | * on-line array. | |
5507 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5508 | * fields in the info are checked against the array. | |
5509 | * Any differences that cannot be handled will cause an error. | |
5510 | * Normally, only one change can be managed at a time. | |
5511 | */ | |
5512 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5513 | { | |
5514 | int rv = 0; | |
5515 | int cnt = 0; | |
36fa3063 N |
5516 | int state = 0; |
5517 | ||
5518 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5519 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5520 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5521 | |
5522 | if (mddev->major_version != info->major_version || | |
5523 | mddev->minor_version != info->minor_version || | |
5524 | /* mddev->patch_version != info->patch_version || */ | |
5525 | mddev->ctime != info->ctime || | |
5526 | mddev->level != info->level || | |
5527 | /* mddev->layout != info->layout || */ | |
5528 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5529 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5530 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5531 | ((state^info->state) & 0xfffffe00) | |
5532 | ) | |
1da177e4 LT |
5533 | return -EINVAL; |
5534 | /* Check there is only one change */ | |
58c0fed4 AN |
5535 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5536 | cnt++; | |
5537 | if (mddev->raid_disks != info->raid_disks) | |
5538 | cnt++; | |
5539 | if (mddev->layout != info->layout) | |
5540 | cnt++; | |
5541 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5542 | cnt++; | |
5543 | if (cnt == 0) | |
5544 | return 0; | |
5545 | if (cnt > 1) | |
5546 | return -EINVAL; | |
1da177e4 LT |
5547 | |
5548 | if (mddev->layout != info->layout) { | |
5549 | /* Change layout | |
5550 | * we don't need to do anything at the md level, the | |
5551 | * personality will take care of it all. | |
5552 | */ | |
50ac168a | 5553 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5554 | return -EINVAL; |
597a711b N |
5555 | else { |
5556 | mddev->new_layout = info->layout; | |
50ac168a | 5557 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5558 | if (rv) |
5559 | mddev->new_layout = mddev->layout; | |
5560 | return rv; | |
5561 | } | |
1da177e4 | 5562 | } |
58c0fed4 | 5563 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5564 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5565 | |
da943b99 N |
5566 | if (mddev->raid_disks != info->raid_disks) |
5567 | rv = update_raid_disks(mddev, info->raid_disks); | |
5568 | ||
36fa3063 N |
5569 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5570 | if (mddev->pers->quiesce == NULL) | |
5571 | return -EINVAL; | |
5572 | if (mddev->recovery || mddev->sync_thread) | |
5573 | return -EBUSY; | |
5574 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5575 | /* add the bitmap */ | |
5576 | if (mddev->bitmap) | |
5577 | return -EEXIST; | |
c3d9714e | 5578 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5579 | return -EINVAL; |
c3d9714e N |
5580 | mddev->bitmap_info.offset = |
5581 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5582 | mddev->pers->quiesce(mddev, 1); |
5583 | rv = bitmap_create(mddev); | |
5584 | if (rv) | |
5585 | bitmap_destroy(mddev); | |
5586 | mddev->pers->quiesce(mddev, 0); | |
5587 | } else { | |
5588 | /* remove the bitmap */ | |
5589 | if (!mddev->bitmap) | |
5590 | return -ENOENT; | |
5591 | if (mddev->bitmap->file) | |
5592 | return -EINVAL; | |
5593 | mddev->pers->quiesce(mddev, 1); | |
5594 | bitmap_destroy(mddev); | |
5595 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5596 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5597 | } |
5598 | } | |
850b2b42 | 5599 | md_update_sb(mddev, 1); |
1da177e4 LT |
5600 | return rv; |
5601 | } | |
5602 | ||
5603 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5604 | { | |
5605 | mdk_rdev_t *rdev; | |
5606 | ||
5607 | if (mddev->pers == NULL) | |
5608 | return -ENODEV; | |
5609 | ||
5610 | rdev = find_rdev(mddev, dev); | |
5611 | if (!rdev) | |
5612 | return -ENODEV; | |
5613 | ||
5614 | md_error(mddev, rdev); | |
5615 | return 0; | |
5616 | } | |
5617 | ||
2f9618ce AN |
5618 | /* |
5619 | * We have a problem here : there is no easy way to give a CHS | |
5620 | * virtual geometry. We currently pretend that we have a 2 heads | |
5621 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5622 | * dosfs just mad... ;-) | |
5623 | */ | |
a885c8c4 CH |
5624 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5625 | { | |
5626 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5627 | ||
5628 | geo->heads = 2; | |
5629 | geo->sectors = 4; | |
49ce6cea | 5630 | geo->cylinders = mddev->array_sectors / 8; |
a885c8c4 CH |
5631 | return 0; |
5632 | } | |
5633 | ||
a39907fa | 5634 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5635 | unsigned int cmd, unsigned long arg) |
5636 | { | |
5637 | int err = 0; | |
5638 | void __user *argp = (void __user *)arg; | |
1da177e4 | 5639 | mddev_t *mddev = NULL; |
e2218350 | 5640 | int ro; |
1da177e4 LT |
5641 | |
5642 | if (!capable(CAP_SYS_ADMIN)) | |
5643 | return -EACCES; | |
5644 | ||
5645 | /* | |
5646 | * Commands dealing with the RAID driver but not any | |
5647 | * particular array: | |
5648 | */ | |
5649 | switch (cmd) | |
5650 | { | |
5651 | case RAID_VERSION: | |
5652 | err = get_version(argp); | |
5653 | goto done; | |
5654 | ||
5655 | case PRINT_RAID_DEBUG: | |
5656 | err = 0; | |
5657 | md_print_devices(); | |
5658 | goto done; | |
5659 | ||
5660 | #ifndef MODULE | |
5661 | case RAID_AUTORUN: | |
5662 | err = 0; | |
5663 | autostart_arrays(arg); | |
5664 | goto done; | |
5665 | #endif | |
5666 | default:; | |
5667 | } | |
5668 | ||
5669 | /* | |
5670 | * Commands creating/starting a new array: | |
5671 | */ | |
5672 | ||
a39907fa | 5673 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5674 | |
5675 | if (!mddev) { | |
5676 | BUG(); | |
5677 | goto abort; | |
5678 | } | |
5679 | ||
1da177e4 LT |
5680 | err = mddev_lock(mddev); |
5681 | if (err) { | |
5682 | printk(KERN_INFO | |
5683 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5684 | err, cmd); | |
5685 | goto abort; | |
5686 | } | |
5687 | ||
5688 | switch (cmd) | |
5689 | { | |
5690 | case SET_ARRAY_INFO: | |
5691 | { | |
5692 | mdu_array_info_t info; | |
5693 | if (!arg) | |
5694 | memset(&info, 0, sizeof(info)); | |
5695 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5696 | err = -EFAULT; | |
5697 | goto abort_unlock; | |
5698 | } | |
5699 | if (mddev->pers) { | |
5700 | err = update_array_info(mddev, &info); | |
5701 | if (err) { | |
5702 | printk(KERN_WARNING "md: couldn't update" | |
5703 | " array info. %d\n", err); | |
5704 | goto abort_unlock; | |
5705 | } | |
5706 | goto done_unlock; | |
5707 | } | |
5708 | if (!list_empty(&mddev->disks)) { | |
5709 | printk(KERN_WARNING | |
5710 | "md: array %s already has disks!\n", | |
5711 | mdname(mddev)); | |
5712 | err = -EBUSY; | |
5713 | goto abort_unlock; | |
5714 | } | |
5715 | if (mddev->raid_disks) { | |
5716 | printk(KERN_WARNING | |
5717 | "md: array %s already initialised!\n", | |
5718 | mdname(mddev)); | |
5719 | err = -EBUSY; | |
5720 | goto abort_unlock; | |
5721 | } | |
5722 | err = set_array_info(mddev, &info); | |
5723 | if (err) { | |
5724 | printk(KERN_WARNING "md: couldn't set" | |
5725 | " array info. %d\n", err); | |
5726 | goto abort_unlock; | |
5727 | } | |
5728 | } | |
5729 | goto done_unlock; | |
5730 | ||
5731 | default:; | |
5732 | } | |
5733 | ||
5734 | /* | |
5735 | * Commands querying/configuring an existing array: | |
5736 | */ | |
32a7627c | 5737 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5738 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5739 | if ((!mddev->raid_disks && !mddev->external) |
5740 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5741 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5742 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5743 | err = -ENODEV; |
5744 | goto abort_unlock; | |
5745 | } | |
5746 | ||
5747 | /* | |
5748 | * Commands even a read-only array can execute: | |
5749 | */ | |
5750 | switch (cmd) | |
5751 | { | |
5752 | case GET_ARRAY_INFO: | |
5753 | err = get_array_info(mddev, argp); | |
5754 | goto done_unlock; | |
5755 | ||
32a7627c | 5756 | case GET_BITMAP_FILE: |
87162a28 | 5757 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5758 | goto done_unlock; |
5759 | ||
1da177e4 LT |
5760 | case GET_DISK_INFO: |
5761 | err = get_disk_info(mddev, argp); | |
5762 | goto done_unlock; | |
5763 | ||
5764 | case RESTART_ARRAY_RW: | |
5765 | err = restart_array(mddev); | |
5766 | goto done_unlock; | |
5767 | ||
5768 | case STOP_ARRAY: | |
d710e138 | 5769 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5770 | goto done_unlock; |
5771 | ||
5772 | case STOP_ARRAY_RO: | |
a4bd82d0 | 5773 | err = md_set_readonly(mddev, 1); |
1da177e4 LT |
5774 | goto done_unlock; |
5775 | ||
e2218350 DW |
5776 | case BLKROSET: |
5777 | if (get_user(ro, (int __user *)(arg))) { | |
5778 | err = -EFAULT; | |
5779 | goto done_unlock; | |
5780 | } | |
5781 | err = -EINVAL; | |
5782 | ||
5783 | /* if the bdev is going readonly the value of mddev->ro | |
5784 | * does not matter, no writes are coming | |
5785 | */ | |
5786 | if (ro) | |
5787 | goto done_unlock; | |
5788 | ||
5789 | /* are we are already prepared for writes? */ | |
5790 | if (mddev->ro != 1) | |
5791 | goto done_unlock; | |
5792 | ||
5793 | /* transitioning to readauto need only happen for | |
5794 | * arrays that call md_write_start | |
5795 | */ | |
5796 | if (mddev->pers) { | |
5797 | err = restart_array(mddev); | |
5798 | if (err == 0) { | |
5799 | mddev->ro = 2; | |
5800 | set_disk_ro(mddev->gendisk, 0); | |
5801 | } | |
5802 | } | |
5803 | goto done_unlock; | |
1da177e4 LT |
5804 | } |
5805 | ||
5806 | /* | |
5807 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5808 | * superblock, so we do not allow them on read-only arrays. |
5809 | * However non-MD ioctls (e.g. get-size) will still come through | |
5810 | * here and hit the 'default' below, so only disallow | |
5811 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5812 | */ |
bb57fc64 | 5813 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5814 | if (mddev->ro == 2) { |
5815 | mddev->ro = 0; | |
b62b7590 | 5816 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 NB |
5817 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5818 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5819 | } else { |
5820 | err = -EROFS; | |
5821 | goto abort_unlock; | |
5822 | } | |
1da177e4 LT |
5823 | } |
5824 | ||
5825 | switch (cmd) | |
5826 | { | |
5827 | case ADD_NEW_DISK: | |
5828 | { | |
5829 | mdu_disk_info_t info; | |
5830 | if (copy_from_user(&info, argp, sizeof(info))) | |
5831 | err = -EFAULT; | |
5832 | else | |
5833 | err = add_new_disk(mddev, &info); | |
5834 | goto done_unlock; | |
5835 | } | |
5836 | ||
5837 | case HOT_REMOVE_DISK: | |
5838 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5839 | goto done_unlock; | |
5840 | ||
5841 | case HOT_ADD_DISK: | |
5842 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5843 | goto done_unlock; | |
5844 | ||
5845 | case SET_DISK_FAULTY: | |
5846 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5847 | goto done_unlock; | |
5848 | ||
5849 | case RUN_ARRAY: | |
d710e138 | 5850 | err = do_md_run(mddev); |
1da177e4 LT |
5851 | goto done_unlock; |
5852 | ||
32a7627c N |
5853 | case SET_BITMAP_FILE: |
5854 | err = set_bitmap_file(mddev, (int)arg); | |
5855 | goto done_unlock; | |
5856 | ||
1da177e4 | 5857 | default: |
1da177e4 LT |
5858 | err = -EINVAL; |
5859 | goto abort_unlock; | |
5860 | } | |
5861 | ||
5862 | done_unlock: | |
5863 | abort_unlock: | |
d3374825 N |
5864 | if (mddev->hold_active == UNTIL_IOCTL && |
5865 | err != -EINVAL) | |
5866 | mddev->hold_active = 0; | |
1da177e4 LT |
5867 | mddev_unlock(mddev); |
5868 | ||
5869 | return err; | |
5870 | done: | |
5871 | if (err) | |
5872 | MD_BUG(); | |
5873 | abort: | |
5874 | return err; | |
5875 | } | |
aa98aa31 AB |
5876 | #ifdef CONFIG_COMPAT |
5877 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
5878 | unsigned int cmd, unsigned long arg) | |
5879 | { | |
5880 | switch (cmd) { | |
5881 | case HOT_REMOVE_DISK: | |
5882 | case HOT_ADD_DISK: | |
5883 | case SET_DISK_FAULTY: | |
5884 | case SET_BITMAP_FILE: | |
5885 | /* These take in integer arg, do not convert */ | |
5886 | break; | |
5887 | default: | |
5888 | arg = (unsigned long)compat_ptr(arg); | |
5889 | break; | |
5890 | } | |
5891 | ||
5892 | return md_ioctl(bdev, mode, cmd, arg); | |
5893 | } | |
5894 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 5895 | |
a39907fa | 5896 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5897 | { |
5898 | /* | |
5899 | * Succeed if we can lock the mddev, which confirms that | |
5900 | * it isn't being stopped right now. | |
5901 | */ | |
d3374825 | 5902 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5903 | int err; |
5904 | ||
d3374825 N |
5905 | if (mddev->gendisk != bdev->bd_disk) { |
5906 | /* we are racing with mddev_put which is discarding this | |
5907 | * bd_disk. | |
5908 | */ | |
5909 | mddev_put(mddev); | |
5910 | /* Wait until bdev->bd_disk is definitely gone */ | |
5911 | flush_scheduled_work(); | |
5912 | /* Then retry the open from the top */ | |
5913 | return -ERESTARTSYS; | |
5914 | } | |
5915 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5916 | ||
c8c00a69 | 5917 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
5918 | goto out; |
5919 | ||
5920 | err = 0; | |
f2ea68cf | 5921 | atomic_inc(&mddev->openers); |
c8c00a69 | 5922 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 5923 | |
f3b99be1 | 5924 | check_disk_size_change(mddev->gendisk, bdev); |
1da177e4 LT |
5925 | out: |
5926 | return err; | |
5927 | } | |
5928 | ||
a39907fa | 5929 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5930 | { |
a39907fa | 5931 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5932 | |
52e5f9d1 | 5933 | BUG_ON(!mddev); |
f2ea68cf | 5934 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5935 | mddev_put(mddev); |
5936 | ||
5937 | return 0; | |
5938 | } | |
83d5cde4 | 5939 | static const struct block_device_operations md_fops = |
1da177e4 LT |
5940 | { |
5941 | .owner = THIS_MODULE, | |
a39907fa AV |
5942 | .open = md_open, |
5943 | .release = md_release, | |
b492b852 | 5944 | .ioctl = md_ioctl, |
aa98aa31 AB |
5945 | #ifdef CONFIG_COMPAT |
5946 | .compat_ioctl = md_compat_ioctl, | |
5947 | #endif | |
a885c8c4 | 5948 | .getgeo = md_getgeo, |
1da177e4 LT |
5949 | }; |
5950 | ||
75c96f85 | 5951 | static int md_thread(void * arg) |
1da177e4 LT |
5952 | { |
5953 | mdk_thread_t *thread = arg; | |
5954 | ||
1da177e4 LT |
5955 | /* |
5956 | * md_thread is a 'system-thread', it's priority should be very | |
5957 | * high. We avoid resource deadlocks individually in each | |
5958 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5959 | * the very same RT priority as kswapd, thus we will never get | |
5960 | * into a priority inversion deadlock. | |
5961 | * | |
5962 | * we definitely have to have equal or higher priority than | |
5963 | * bdflush, otherwise bdflush will deadlock if there are too | |
5964 | * many dirty RAID5 blocks. | |
5965 | */ | |
1da177e4 | 5966 | |
6985c43f | 5967 | allow_signal(SIGKILL); |
a6fb0934 | 5968 | while (!kthread_should_stop()) { |
1da177e4 | 5969 | |
93588e22 N |
5970 | /* We need to wait INTERRUPTIBLE so that |
5971 | * we don't add to the load-average. | |
5972 | * That means we need to be sure no signals are | |
5973 | * pending | |
5974 | */ | |
5975 | if (signal_pending(current)) | |
5976 | flush_signals(current); | |
5977 | ||
5978 | wait_event_interruptible_timeout | |
5979 | (thread->wqueue, | |
5980 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5981 | || kthread_should_stop(), | |
5982 | thread->timeout); | |
1da177e4 LT |
5983 | |
5984 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5985 | ||
787453c2 | 5986 | thread->run(thread->mddev); |
1da177e4 | 5987 | } |
a6fb0934 | 5988 | |
1da177e4 LT |
5989 | return 0; |
5990 | } | |
5991 | ||
5992 | void md_wakeup_thread(mdk_thread_t *thread) | |
5993 | { | |
5994 | if (thread) { | |
5995 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5996 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5997 | wake_up(&thread->wqueue); | |
5998 | } | |
5999 | } | |
6000 | ||
6001 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
6002 | const char *name) | |
6003 | { | |
6004 | mdk_thread_t *thread; | |
1da177e4 | 6005 | |
9ffae0cf | 6006 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
6007 | if (!thread) |
6008 | return NULL; | |
6009 | ||
1da177e4 LT |
6010 | init_waitqueue_head(&thread->wqueue); |
6011 | ||
1da177e4 LT |
6012 | thread->run = run; |
6013 | thread->mddev = mddev; | |
32a7627c | 6014 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
6015 | thread->tsk = kthread_run(md_thread, thread, |
6016 | "%s_%s", | |
6017 | mdname(thread->mddev), | |
6018 | name ?: mddev->pers->name); | |
a6fb0934 | 6019 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
6020 | kfree(thread); |
6021 | return NULL; | |
6022 | } | |
1da177e4 LT |
6023 | return thread; |
6024 | } | |
6025 | ||
1da177e4 LT |
6026 | void md_unregister_thread(mdk_thread_t *thread) |
6027 | { | |
e0cf8f04 N |
6028 | if (!thread) |
6029 | return; | |
ba25f9dc | 6030 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
6031 | |
6032 | kthread_stop(thread->tsk); | |
1da177e4 LT |
6033 | kfree(thread); |
6034 | } | |
6035 | ||
6036 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
6037 | { | |
6038 | if (!mddev) { | |
6039 | MD_BUG(); | |
6040 | return; | |
6041 | } | |
6042 | ||
b2d444d7 | 6043 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 6044 | return; |
6bfe0b49 DW |
6045 | |
6046 | if (mddev->external) | |
6047 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 6048 | /* |
1da177e4 LT |
6049 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
6050 | mdname(mddev), | |
6051 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
6052 | __builtin_return_address(0),__builtin_return_address(1), | |
6053 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 6054 | */ |
d0a0a5ee AM |
6055 | if (!mddev->pers) |
6056 | return; | |
1da177e4 LT |
6057 | if (!mddev->pers->error_handler) |
6058 | return; | |
6059 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
6060 | if (mddev->degraded) |
6061 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c0cc75f8 | 6062 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
6063 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6064 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6065 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 6066 | md_new_event_inintr(mddev); |
1da177e4 LT |
6067 | } |
6068 | ||
6069 | /* seq_file implementation /proc/mdstat */ | |
6070 | ||
6071 | static void status_unused(struct seq_file *seq) | |
6072 | { | |
6073 | int i = 0; | |
6074 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6075 | |
6076 | seq_printf(seq, "unused devices: "); | |
6077 | ||
159ec1fc | 6078 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
6079 | char b[BDEVNAME_SIZE]; |
6080 | i++; | |
6081 | seq_printf(seq, "%s ", | |
6082 | bdevname(rdev->bdev,b)); | |
6083 | } | |
6084 | if (!i) | |
6085 | seq_printf(seq, "<none>"); | |
6086 | ||
6087 | seq_printf(seq, "\n"); | |
6088 | } | |
6089 | ||
6090 | ||
6091 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
6092 | { | |
dd71cf6b N |
6093 | sector_t max_sectors, resync, res; |
6094 | unsigned long dt, db; | |
6095 | sector_t rt; | |
4588b42e N |
6096 | int scale; |
6097 | unsigned int per_milli; | |
1da177e4 | 6098 | |
dd71cf6b | 6099 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6100 | |
6101 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 6102 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 6103 | else |
dd71cf6b | 6104 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
6105 | |
6106 | /* | |
6107 | * Should not happen. | |
6108 | */ | |
dd71cf6b | 6109 | if (!max_sectors) { |
1da177e4 LT |
6110 | MD_BUG(); |
6111 | return; | |
6112 | } | |
4588b42e | 6113 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 6114 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
6115 | * u32, as those are the requirements for sector_div. |
6116 | * Thus 'scale' must be at least 10 | |
6117 | */ | |
6118 | scale = 10; | |
6119 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 6120 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
6121 | scale++; |
6122 | } | |
6123 | res = (resync>>scale)*1000; | |
dd71cf6b | 6124 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
6125 | |
6126 | per_milli = res; | |
1da177e4 | 6127 | { |
4588b42e | 6128 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
6129 | seq_printf(seq, "["); |
6130 | for (i = 0; i < x; i++) | |
6131 | seq_printf(seq, "="); | |
6132 | seq_printf(seq, ">"); | |
6133 | for (i = 0; i < y; i++) | |
6134 | seq_printf(seq, "."); | |
6135 | seq_printf(seq, "] "); | |
6136 | } | |
4588b42e | 6137 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
6138 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
6139 | "reshape" : | |
61df9d91 N |
6140 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
6141 | "check" : | |
6142 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
6143 | "resync" : "recovery"))), | |
6144 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
6145 | (unsigned long long) resync/2, |
6146 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
6147 | |
6148 | /* | |
1da177e4 LT |
6149 | * dt: time from mark until now |
6150 | * db: blocks written from mark until now | |
6151 | * rt: remaining time | |
dd71cf6b N |
6152 | * |
6153 | * rt is a sector_t, so could be 32bit or 64bit. | |
6154 | * So we divide before multiply in case it is 32bit and close | |
6155 | * to the limit. | |
6156 | * We scale the divisor (db) by 32 to avoid loosing precision | |
6157 | * near the end of resync when the number of remaining sectors | |
6158 | * is close to 'db'. | |
6159 | * We then divide rt by 32 after multiplying by db to compensate. | |
6160 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
6161 | */ |
6162 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
6163 | if (!dt) dt++; | |
ff4e8d9a N |
6164 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
6165 | - mddev->resync_mark_cnt; | |
1da177e4 | 6166 | |
dd71cf6b N |
6167 | rt = max_sectors - resync; /* number of remaining sectors */ |
6168 | sector_div(rt, db/32+1); | |
6169 | rt *= dt; | |
6170 | rt >>= 5; | |
6171 | ||
6172 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6173 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6174 | |
ff4e8d9a | 6175 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6176 | } |
6177 | ||
6178 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6179 | { | |
6180 | struct list_head *tmp; | |
6181 | loff_t l = *pos; | |
6182 | mddev_t *mddev; | |
6183 | ||
6184 | if (l >= 0x10000) | |
6185 | return NULL; | |
6186 | if (!l--) | |
6187 | /* header */ | |
6188 | return (void*)1; | |
6189 | ||
6190 | spin_lock(&all_mddevs_lock); | |
6191 | list_for_each(tmp,&all_mddevs) | |
6192 | if (!l--) { | |
6193 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6194 | mddev_get(mddev); | |
6195 | spin_unlock(&all_mddevs_lock); | |
6196 | return mddev; | |
6197 | } | |
6198 | spin_unlock(&all_mddevs_lock); | |
6199 | if (!l--) | |
6200 | return (void*)2;/* tail */ | |
6201 | return NULL; | |
6202 | } | |
6203 | ||
6204 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6205 | { | |
6206 | struct list_head *tmp; | |
6207 | mddev_t *next_mddev, *mddev = v; | |
6208 | ||
6209 | ++*pos; | |
6210 | if (v == (void*)2) | |
6211 | return NULL; | |
6212 | ||
6213 | spin_lock(&all_mddevs_lock); | |
6214 | if (v == (void*)1) | |
6215 | tmp = all_mddevs.next; | |
6216 | else | |
6217 | tmp = mddev->all_mddevs.next; | |
6218 | if (tmp != &all_mddevs) | |
6219 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6220 | else { | |
6221 | next_mddev = (void*)2; | |
6222 | *pos = 0x10000; | |
6223 | } | |
6224 | spin_unlock(&all_mddevs_lock); | |
6225 | ||
6226 | if (v != (void*)1) | |
6227 | mddev_put(mddev); | |
6228 | return next_mddev; | |
6229 | ||
6230 | } | |
6231 | ||
6232 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6233 | { | |
6234 | mddev_t *mddev = v; | |
6235 | ||
6236 | if (mddev && v != (void*)1 && v != (void*)2) | |
6237 | mddev_put(mddev); | |
6238 | } | |
6239 | ||
d7603b7e N |
6240 | struct mdstat_info { |
6241 | int event; | |
6242 | }; | |
6243 | ||
1da177e4 LT |
6244 | static int md_seq_show(struct seq_file *seq, void *v) |
6245 | { | |
6246 | mddev_t *mddev = v; | |
dd8ac336 | 6247 | sector_t sectors; |
1da177e4 | 6248 | mdk_rdev_t *rdev; |
d7603b7e | 6249 | struct mdstat_info *mi = seq->private; |
32a7627c | 6250 | struct bitmap *bitmap; |
1da177e4 LT |
6251 | |
6252 | if (v == (void*)1) { | |
2604b703 | 6253 | struct mdk_personality *pers; |
1da177e4 LT |
6254 | seq_printf(seq, "Personalities : "); |
6255 | spin_lock(&pers_lock); | |
2604b703 N |
6256 | list_for_each_entry(pers, &pers_list, list) |
6257 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6258 | |
6259 | spin_unlock(&pers_lock); | |
6260 | seq_printf(seq, "\n"); | |
d7603b7e | 6261 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6262 | return 0; |
6263 | } | |
6264 | if (v == (void*)2) { | |
6265 | status_unused(seq); | |
6266 | return 0; | |
6267 | } | |
6268 | ||
5dc5cf7d | 6269 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6270 | return -EINTR; |
5dc5cf7d | 6271 | |
1da177e4 LT |
6272 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6273 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6274 | mddev->pers ? "" : "in"); | |
6275 | if (mddev->pers) { | |
f91de92e | 6276 | if (mddev->ro==1) |
1da177e4 | 6277 | seq_printf(seq, " (read-only)"); |
f91de92e | 6278 | if (mddev->ro==2) |
52720ae7 | 6279 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6280 | seq_printf(seq, " %s", mddev->pers->name); |
6281 | } | |
6282 | ||
dd8ac336 | 6283 | sectors = 0; |
159ec1fc | 6284 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6285 | char b[BDEVNAME_SIZE]; |
6286 | seq_printf(seq, " %s[%d]", | |
6287 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6288 | if (test_bit(WriteMostly, &rdev->flags)) |
6289 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6290 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6291 | seq_printf(seq, "(F)"); |
6292 | continue; | |
b325a32e N |
6293 | } else if (rdev->raid_disk < 0) |
6294 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6295 | sectors += rdev->sectors; |
1da177e4 LT |
6296 | } |
6297 | ||
6298 | if (!list_empty(&mddev->disks)) { | |
6299 | if (mddev->pers) | |
6300 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6301 | (unsigned long long) |
6302 | mddev->array_sectors / 2); | |
1da177e4 LT |
6303 | else |
6304 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6305 | (unsigned long long)sectors / 2); |
1da177e4 | 6306 | } |
1cd6bf19 N |
6307 | if (mddev->persistent) { |
6308 | if (mddev->major_version != 0 || | |
6309 | mddev->minor_version != 90) { | |
6310 | seq_printf(seq," super %d.%d", | |
6311 | mddev->major_version, | |
6312 | mddev->minor_version); | |
6313 | } | |
e691063a N |
6314 | } else if (mddev->external) |
6315 | seq_printf(seq, " super external:%s", | |
6316 | mddev->metadata_type); | |
6317 | else | |
1cd6bf19 | 6318 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6319 | |
6320 | if (mddev->pers) { | |
d710e138 | 6321 | mddev->pers->status(seq, mddev); |
1da177e4 | 6322 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6323 | if (mddev->pers->sync_request) { |
6324 | if (mddev->curr_resync > 2) { | |
d710e138 | 6325 | status_resync(seq, mddev); |
8e1b39d6 N |
6326 | seq_printf(seq, "\n "); |
6327 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6328 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6329 | else if (mddev->recovery_cp < MaxSector) | |
6330 | seq_printf(seq, "\tresync=PENDING\n "); | |
6331 | } | |
32a7627c N |
6332 | } else |
6333 | seq_printf(seq, "\n "); | |
6334 | ||
6335 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6336 | unsigned long chunk_kb; |
6337 | unsigned long flags; | |
32a7627c | 6338 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6339 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6340 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6341 | "%lu%s chunk", | |
6342 | bitmap->pages - bitmap->missing_pages, | |
6343 | bitmap->pages, | |
6344 | (bitmap->pages - bitmap->missing_pages) | |
6345 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6346 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6347 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6348 | if (bitmap->file) { |
6349 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6350 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6351 | } |
78d742d8 | 6352 | |
32a7627c N |
6353 | seq_printf(seq, "\n"); |
6354 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6355 | } |
6356 | ||
6357 | seq_printf(seq, "\n"); | |
6358 | } | |
6359 | mddev_unlock(mddev); | |
6360 | ||
6361 | return 0; | |
6362 | } | |
6363 | ||
110518bc | 6364 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6365 | .start = md_seq_start, |
6366 | .next = md_seq_next, | |
6367 | .stop = md_seq_stop, | |
6368 | .show = md_seq_show, | |
6369 | }; | |
6370 | ||
6371 | static int md_seq_open(struct inode *inode, struct file *file) | |
6372 | { | |
6373 | int error; | |
d7603b7e N |
6374 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6375 | if (mi == NULL) | |
6376 | return -ENOMEM; | |
1da177e4 LT |
6377 | |
6378 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6379 | if (error) |
6380 | kfree(mi); | |
6381 | else { | |
6382 | struct seq_file *p = file->private_data; | |
6383 | p->private = mi; | |
6384 | mi->event = atomic_read(&md_event_count); | |
6385 | } | |
1da177e4 LT |
6386 | return error; |
6387 | } | |
6388 | ||
d7603b7e N |
6389 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6390 | { | |
6391 | struct seq_file *m = filp->private_data; | |
6392 | struct mdstat_info *mi = m->private; | |
6393 | int mask; | |
6394 | ||
6395 | poll_wait(filp, &md_event_waiters, wait); | |
6396 | ||
6397 | /* always allow read */ | |
6398 | mask = POLLIN | POLLRDNORM; | |
6399 | ||
6400 | if (mi->event != atomic_read(&md_event_count)) | |
6401 | mask |= POLLERR | POLLPRI; | |
6402 | return mask; | |
6403 | } | |
6404 | ||
fa027c2a | 6405 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6406 | .owner = THIS_MODULE, |
1da177e4 LT |
6407 | .open = md_seq_open, |
6408 | .read = seq_read, | |
6409 | .llseek = seq_lseek, | |
c3f94b40 | 6410 | .release = seq_release_private, |
d7603b7e | 6411 | .poll = mdstat_poll, |
1da177e4 LT |
6412 | }; |
6413 | ||
2604b703 | 6414 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6415 | { |
1da177e4 | 6416 | spin_lock(&pers_lock); |
2604b703 N |
6417 | list_add_tail(&p->list, &pers_list); |
6418 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6419 | spin_unlock(&pers_lock); |
6420 | return 0; | |
6421 | } | |
6422 | ||
2604b703 | 6423 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6424 | { |
2604b703 | 6425 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6426 | spin_lock(&pers_lock); |
2604b703 | 6427 | list_del_init(&p->list); |
1da177e4 LT |
6428 | spin_unlock(&pers_lock); |
6429 | return 0; | |
6430 | } | |
6431 | ||
eea1bf38 | 6432 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6433 | { |
6434 | mdk_rdev_t * rdev; | |
1da177e4 | 6435 | int idle; |
eea1bf38 | 6436 | int curr_events; |
1da177e4 LT |
6437 | |
6438 | idle = 1; | |
4b80991c N |
6439 | rcu_read_lock(); |
6440 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6441 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6442 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6443 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6444 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6445 | /* sync IO will cause sync_io to increase before the disk_stats |
6446 | * as sync_io is counted when a request starts, and | |
6447 | * disk_stats is counted when it completes. | |
6448 | * So resync activity will cause curr_events to be smaller than | |
6449 | * when there was no such activity. | |
6450 | * non-sync IO will cause disk_stat to increase without | |
6451 | * increasing sync_io so curr_events will (eventually) | |
6452 | * be larger than it was before. Once it becomes | |
6453 | * substantially larger, the test below will cause | |
6454 | * the array to appear non-idle, and resync will slow | |
6455 | * down. | |
6456 | * If there is a lot of outstanding resync activity when | |
6457 | * we set last_event to curr_events, then all that activity | |
6458 | * completing might cause the array to appear non-idle | |
6459 | * and resync will be slowed down even though there might | |
6460 | * not have been non-resync activity. This will only | |
6461 | * happen once though. 'last_events' will soon reflect | |
6462 | * the state where there is little or no outstanding | |
6463 | * resync requests, and further resync activity will | |
6464 | * always make curr_events less than last_events. | |
c0e48521 | 6465 | * |
1da177e4 | 6466 | */ |
eea1bf38 | 6467 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6468 | rdev->last_events = curr_events; |
6469 | idle = 0; | |
6470 | } | |
6471 | } | |
4b80991c | 6472 | rcu_read_unlock(); |
1da177e4 LT |
6473 | return idle; |
6474 | } | |
6475 | ||
6476 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6477 | { | |
6478 | /* another "blocks" (512byte) blocks have been synced */ | |
6479 | atomic_sub(blocks, &mddev->recovery_active); | |
6480 | wake_up(&mddev->recovery_wait); | |
6481 | if (!ok) { | |
dfc70645 | 6482 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6483 | md_wakeup_thread(mddev->thread); |
6484 | // stop recovery, signal do_sync .... | |
6485 | } | |
6486 | } | |
6487 | ||
6488 | ||
06d91a5f N |
6489 | /* md_write_start(mddev, bi) |
6490 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6491 | * in superblock) before writing, schedule a superblock update |
6492 | * and wait for it to complete. | |
06d91a5f | 6493 | */ |
3d310eb7 | 6494 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6495 | { |
0fd62b86 | 6496 | int did_change = 0; |
06d91a5f | 6497 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6498 | return; |
06d91a5f | 6499 | |
f91de92e N |
6500 | BUG_ON(mddev->ro == 1); |
6501 | if (mddev->ro == 2) { | |
6502 | /* need to switch to read/write */ | |
6503 | mddev->ro = 0; | |
6504 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6505 | md_wakeup_thread(mddev->thread); | |
25156198 | 6506 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6507 | did_change = 1; |
f91de92e | 6508 | } |
06d91a5f | 6509 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6510 | if (mddev->safemode == 1) |
6511 | mddev->safemode = 0; | |
06d91a5f | 6512 | if (mddev->in_sync) { |
a9701a30 | 6513 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6514 | if (mddev->in_sync) { |
6515 | mddev->in_sync = 0; | |
850b2b42 | 6516 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 6517 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6518 | did_change = 1; |
3d310eb7 | 6519 | } |
a9701a30 | 6520 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6521 | } |
0fd62b86 | 6522 | if (did_change) |
b62b7590 | 6523 | sysfs_notify_dirent(mddev->sysfs_state); |
09a44cc1 N |
6524 | wait_event(mddev->sb_wait, |
6525 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
6526 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
6527 | } |
6528 | ||
6529 | void md_write_end(mddev_t *mddev) | |
6530 | { | |
6531 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6532 | if (mddev->safemode == 2) | |
6533 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6534 | else if (mddev->safemode_delay) |
1da177e4 LT |
6535 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6536 | } | |
6537 | } | |
6538 | ||
2a2275d6 N |
6539 | /* md_allow_write(mddev) |
6540 | * Calling this ensures that the array is marked 'active' so that writes | |
6541 | * may proceed without blocking. It is important to call this before | |
6542 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6543 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6544 | * |
6545 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6546 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6547 | */ |
b5470dc5 | 6548 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6549 | { |
6550 | if (!mddev->pers) | |
b5470dc5 | 6551 | return 0; |
2a2275d6 | 6552 | if (mddev->ro) |
b5470dc5 | 6553 | return 0; |
1a0fd497 | 6554 | if (!mddev->pers->sync_request) |
b5470dc5 | 6555 | return 0; |
2a2275d6 N |
6556 | |
6557 | spin_lock_irq(&mddev->write_lock); | |
6558 | if (mddev->in_sync) { | |
6559 | mddev->in_sync = 0; | |
6560 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6561 | if (mddev->safemode_delay && | |
6562 | mddev->safemode == 0) | |
6563 | mddev->safemode = 1; | |
6564 | spin_unlock_irq(&mddev->write_lock); | |
6565 | md_update_sb(mddev, 0); | |
b62b7590 | 6566 | sysfs_notify_dirent(mddev->sysfs_state); |
2a2275d6 N |
6567 | } else |
6568 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
6569 | |
6570 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
6571 | return -EAGAIN; | |
6572 | else | |
6573 | return 0; | |
2a2275d6 N |
6574 | } |
6575 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6576 | ||
1da177e4 LT |
6577 | #define SYNC_MARKS 10 |
6578 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6579 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6580 | { |
6581 | mddev_t *mddev2; | |
6582 | unsigned int currspeed = 0, | |
6583 | window; | |
57afd89f | 6584 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6585 | unsigned long mark[SYNC_MARKS]; |
6586 | sector_t mark_cnt[SYNC_MARKS]; | |
6587 | int last_mark,m; | |
6588 | struct list_head *tmp; | |
6589 | sector_t last_check; | |
57afd89f | 6590 | int skipped = 0; |
5fd6c1dc | 6591 | mdk_rdev_t *rdev; |
61df9d91 | 6592 | char *desc; |
1da177e4 LT |
6593 | |
6594 | /* just incase thread restarts... */ | |
6595 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6596 | return; | |
5fd6c1dc N |
6597 | if (mddev->ro) /* never try to sync a read-only array */ |
6598 | return; | |
1da177e4 | 6599 | |
61df9d91 N |
6600 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6601 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6602 | desc = "data-check"; | |
6603 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6604 | desc = "requested-resync"; | |
6605 | else | |
6606 | desc = "resync"; | |
6607 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6608 | desc = "reshape"; | |
6609 | else | |
6610 | desc = "recovery"; | |
6611 | ||
1da177e4 LT |
6612 | /* we overload curr_resync somewhat here. |
6613 | * 0 == not engaged in resync at all | |
6614 | * 2 == checking that there is no conflict with another sync | |
6615 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6616 | * commense | |
6617 | * other == active in resync - this many blocks | |
6618 | * | |
6619 | * Before starting a resync we must have set curr_resync to | |
6620 | * 2, and then checked that every "conflicting" array has curr_resync | |
6621 | * less than ours. When we find one that is the same or higher | |
6622 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6623 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6624 | * This will mean we have to start checking from the beginning again. | |
6625 | * | |
6626 | */ | |
6627 | ||
6628 | do { | |
6629 | mddev->curr_resync = 2; | |
6630 | ||
6631 | try_again: | |
404e4b43 | 6632 | if (kthread_should_stop()) |
6985c43f | 6633 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
404e4b43 N |
6634 | |
6635 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
1da177e4 | 6636 | goto skip; |
29ac4aa3 | 6637 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6638 | if (mddev2 == mddev) |
6639 | continue; | |
90b08710 BS |
6640 | if (!mddev->parallel_resync |
6641 | && mddev2->curr_resync | |
6642 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6643 | DEFINE_WAIT(wq); |
6644 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6645 | /* arbitrarily yield */ | |
6646 | mddev->curr_resync = 1; | |
6647 | wake_up(&resync_wait); | |
6648 | } | |
6649 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6650 | /* no need to wait here, we can wait the next | |
6651 | * time 'round when curr_resync == 2 | |
6652 | */ | |
6653 | continue; | |
9744197c N |
6654 | /* We need to wait 'interruptible' so as not to |
6655 | * contribute to the load average, and not to | |
6656 | * be caught by 'softlockup' | |
6657 | */ | |
6658 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6659 | if (!kthread_should_stop() && |
8712e553 | 6660 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6661 | printk(KERN_INFO "md: delaying %s of %s" |
6662 | " until %s has finished (they" | |
1da177e4 | 6663 | " share one or more physical units)\n", |
61df9d91 | 6664 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6665 | mddev_put(mddev2); |
9744197c N |
6666 | if (signal_pending(current)) |
6667 | flush_signals(current); | |
1da177e4 LT |
6668 | schedule(); |
6669 | finish_wait(&resync_wait, &wq); | |
6670 | goto try_again; | |
6671 | } | |
6672 | finish_wait(&resync_wait, &wq); | |
6673 | } | |
6674 | } | |
6675 | } while (mddev->curr_resync < 2); | |
6676 | ||
5fd6c1dc | 6677 | j = 0; |
9d88883e | 6678 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6679 | /* resync follows the size requested by the personality, |
57afd89f | 6680 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6681 | */ |
6682 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6683 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6684 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6685 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6686 | j = mddev->resync_min; | |
6687 | else if (!mddev->bitmap) | |
5fd6c1dc | 6688 | j = mddev->recovery_cp; |
5e96ee65 | 6689 | |
ccfcc3c1 | 6690 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6691 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6692 | else { |
1da177e4 | 6693 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6694 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6695 | j = MaxSector; |
4e59ca7d DW |
6696 | rcu_read_lock(); |
6697 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc N |
6698 | if (rdev->raid_disk >= 0 && |
6699 | !test_bit(Faulty, &rdev->flags) && | |
6700 | !test_bit(In_sync, &rdev->flags) && | |
6701 | rdev->recovery_offset < j) | |
6702 | j = rdev->recovery_offset; | |
4e59ca7d | 6703 | rcu_read_unlock(); |
5fd6c1dc | 6704 | } |
1da177e4 | 6705 | |
61df9d91 N |
6706 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6707 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6708 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6709 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6710 | "(but not more than %d KB/sec) for %s.\n", |
6711 | speed_max(mddev), desc); | |
1da177e4 | 6712 | |
eea1bf38 | 6713 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6714 | |
57afd89f | 6715 | io_sectors = 0; |
1da177e4 LT |
6716 | for (m = 0; m < SYNC_MARKS; m++) { |
6717 | mark[m] = jiffies; | |
57afd89f | 6718 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6719 | } |
6720 | last_mark = 0; | |
6721 | mddev->resync_mark = mark[last_mark]; | |
6722 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6723 | ||
6724 | /* | |
6725 | * Tune reconstruction: | |
6726 | */ | |
6727 | window = 32*(PAGE_SIZE/512); | |
6728 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6729 | window/2,(unsigned long long) max_sectors/2); | |
6730 | ||
6731 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6732 | last_check = 0; |
6733 | ||
6734 | if (j>2) { | |
6735 | printk(KERN_INFO | |
61df9d91 N |
6736 | "md: resuming %s of %s from checkpoint.\n", |
6737 | desc, mdname(mddev)); | |
1da177e4 LT |
6738 | mddev->curr_resync = j; |
6739 | } | |
efa59339 | 6740 | mddev->curr_resync_completed = mddev->curr_resync; |
1da177e4 LT |
6741 | |
6742 | while (j < max_sectors) { | |
57afd89f | 6743 | sector_t sectors; |
1da177e4 | 6744 | |
57afd89f | 6745 | skipped = 0; |
97e4f42d | 6746 | |
7a91ee1f N |
6747 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6748 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
6749 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6750 | > (max_sectors >> 4)) || | |
6751 | (j - mddev->curr_resync_completed)*2 | |
6752 | >= mddev->resync_max - mddev->curr_resync_completed | |
6753 | )) { | |
97e4f42d N |
6754 | /* time to update curr_resync_completed */ |
6755 | blk_unplug(mddev->queue); | |
6756 | wait_event(mddev->recovery_wait, | |
6757 | atomic_read(&mddev->recovery_active) == 0); | |
6758 | mddev->curr_resync_completed = | |
6759 | mddev->curr_resync; | |
6760 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
acb180b0 | 6761 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 6762 | } |
acb180b0 | 6763 | |
e62e58a5 N |
6764 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
6765 | /* As this condition is controlled by user-space, | |
6766 | * we can block indefinitely, so use '_interruptible' | |
6767 | * to avoid triggering warnings. | |
6768 | */ | |
6769 | flush_signals(current); /* just in case */ | |
6770 | wait_event_interruptible(mddev->recovery_wait, | |
6771 | mddev->resync_max > j | |
6772 | || kthread_should_stop()); | |
6773 | } | |
acb180b0 N |
6774 | |
6775 | if (kthread_should_stop()) | |
6776 | goto interrupted; | |
6777 | ||
57afd89f | 6778 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6779 | currspeed < speed_min(mddev)); |
57afd89f | 6780 | if (sectors == 0) { |
dfc70645 | 6781 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6782 | goto out; |
6783 | } | |
57afd89f N |
6784 | |
6785 | if (!skipped) { /* actual IO requested */ | |
6786 | io_sectors += sectors; | |
6787 | atomic_add(sectors, &mddev->recovery_active); | |
6788 | } | |
6789 | ||
1da177e4 LT |
6790 | j += sectors; |
6791 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6792 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6793 | if (last_check == 0) |
6794 | /* this is the earliers that rebuilt will be | |
6795 | * visible in /proc/mdstat | |
6796 | */ | |
6797 | md_new_event(mddev); | |
57afd89f N |
6798 | |
6799 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6800 | continue; |
6801 | ||
57afd89f | 6802 | last_check = io_sectors; |
1da177e4 | 6803 | |
dfc70645 | 6804 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6805 | break; |
6806 | ||
6807 | repeat: | |
6808 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6809 | /* step marks */ | |
6810 | int next = (last_mark+1) % SYNC_MARKS; | |
6811 | ||
6812 | mddev->resync_mark = mark[next]; | |
6813 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6814 | mark[next] = jiffies; | |
57afd89f | 6815 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6816 | last_mark = next; |
6817 | } | |
6818 | ||
6819 | ||
c6207277 N |
6820 | if (kthread_should_stop()) |
6821 | goto interrupted; | |
6822 | ||
1da177e4 LT |
6823 | |
6824 | /* | |
6825 | * this loop exits only if either when we are slower than | |
6826 | * the 'hard' speed limit, or the system was IO-idle for | |
6827 | * a jiffy. | |
6828 | * the system might be non-idle CPU-wise, but we only care | |
6829 | * about not overloading the IO subsystem. (things like an | |
6830 | * e2fsck being done on the RAID array should execute fast) | |
6831 | */ | |
2ad8b1ef | 6832 | blk_unplug(mddev->queue); |
1da177e4 LT |
6833 | cond_resched(); |
6834 | ||
57afd89f N |
6835 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6836 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6837 | |
88202a0c N |
6838 | if (currspeed > speed_min(mddev)) { |
6839 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6840 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6841 | msleep(500); |
1da177e4 LT |
6842 | goto repeat; |
6843 | } | |
6844 | } | |
6845 | } | |
61df9d91 | 6846 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6847 | /* |
6848 | * this also signals 'finished resyncing' to md_stop | |
6849 | */ | |
6850 | out: | |
2ad8b1ef | 6851 | blk_unplug(mddev->queue); |
1da177e4 LT |
6852 | |
6853 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6854 | ||
6855 | /* tell personality that we are finished */ | |
57afd89f | 6856 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6857 | |
dfc70645 | 6858 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6859 | mddev->curr_resync > 2) { |
6860 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6861 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6862 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6863 | printk(KERN_INFO | |
61df9d91 N |
6864 | "md: checkpointing %s of %s.\n", |
6865 | desc, mdname(mddev)); | |
5fd6c1dc N |
6866 | mddev->recovery_cp = mddev->curr_resync; |
6867 | } | |
6868 | } else | |
6869 | mddev->recovery_cp = MaxSector; | |
6870 | } else { | |
6871 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6872 | mddev->curr_resync = MaxSector; | |
4e59ca7d DW |
6873 | rcu_read_lock(); |
6874 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
5fd6c1dc | 6875 | if (rdev->raid_disk >= 0 && |
70fffd0b | 6876 | mddev->delta_disks >= 0 && |
5fd6c1dc N |
6877 | !test_bit(Faulty, &rdev->flags) && |
6878 | !test_bit(In_sync, &rdev->flags) && | |
6879 | rdev->recovery_offset < mddev->curr_resync) | |
6880 | rdev->recovery_offset = mddev->curr_resync; | |
4e59ca7d | 6881 | rcu_read_unlock(); |
5fd6c1dc | 6882 | } |
1da177e4 | 6883 | } |
17571284 | 6884 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6885 | |
1da177e4 | 6886 | skip: |
c07b70ad N |
6887 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
6888 | /* We completed so min/max setting can be forgotten if used. */ | |
6889 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6890 | mddev->resync_min = 0; | |
6891 | mddev->resync_max = MaxSector; | |
6892 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6893 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 | 6894 | mddev->curr_resync = 0; |
efa59339 N |
6895 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
6896 | mddev->curr_resync_completed = 0; | |
c6207277 | 6897 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
1da177e4 LT |
6898 | wake_up(&resync_wait); |
6899 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6900 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6901 | return; |
6902 | ||
6903 | interrupted: | |
6904 | /* | |
6905 | * got a signal, exit. | |
6906 | */ | |
6907 | printk(KERN_INFO | |
6908 | "md: md_do_sync() got signal ... exiting\n"); | |
6909 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6910 | goto out; | |
6911 | ||
1da177e4 | 6912 | } |
29269553 | 6913 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6914 | |
6915 | ||
b4c4c7b8 N |
6916 | static int remove_and_add_spares(mddev_t *mddev) |
6917 | { | |
6918 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6919 | int spares = 0; |
6920 | ||
97e4f42d N |
6921 | mddev->curr_resync_completed = 0; |
6922 | ||
159ec1fc | 6923 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6924 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6925 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6926 | (test_bit(Faulty, &rdev->flags) || |
6927 | ! test_bit(In_sync, &rdev->flags)) && | |
6928 | atomic_read(&rdev->nr_pending)==0) { | |
6929 | if (mddev->pers->hot_remove_disk( | |
6930 | mddev, rdev->raid_disk)==0) { | |
6931 | char nm[20]; | |
6932 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6933 | sysfs_remove_link(&mddev->kobj, nm); | |
6934 | rdev->raid_disk = -1; | |
6935 | } | |
6936 | } | |
6937 | ||
4044ba58 | 6938 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 6939 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6940 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6941 | !test_bit(In_sync, &rdev->flags) && |
6942 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6943 | spares++; |
b4c4c7b8 N |
6944 | if (rdev->raid_disk < 0 |
6945 | && !test_bit(Faulty, &rdev->flags)) { | |
6946 | rdev->recovery_offset = 0; | |
199050ea NB |
6947 | if (mddev->pers-> |
6948 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6949 | char nm[20]; |
6950 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6951 | if (sysfs_create_link(&mddev->kobj, |
6952 | &rdev->kobj, nm)) | |
6953 | printk(KERN_WARNING | |
6954 | "md: cannot register " | |
6955 | "%s for %s\n", | |
6956 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6957 | spares++; |
6958 | md_new_event(mddev); | |
93be75ff | 6959 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
6960 | } else |
6961 | break; | |
6962 | } | |
dfc70645 | 6963 | } |
b4c4c7b8 N |
6964 | } |
6965 | return spares; | |
6966 | } | |
1da177e4 LT |
6967 | /* |
6968 | * This routine is regularly called by all per-raid-array threads to | |
6969 | * deal with generic issues like resync and super-block update. | |
6970 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6971 | * need this as they never do any recovery or update the superblock. | |
6972 | * | |
6973 | * It does not do any resync itself, but rather "forks" off other threads | |
6974 | * to do that as needed. | |
6975 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6976 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6977 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6978 | * and wakeups up this thread which will reap the thread and finish up. |
6979 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6980 | * | |
6981 | * The overall approach is: | |
6982 | * 1/ if the superblock needs updating, update it. | |
6983 | * 2/ If a recovery thread is running, don't do anything else. | |
6984 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6985 | * 4/ If there are any faulty devices, remove them. | |
6986 | * 5/ If array is degraded, try to add spares devices | |
6987 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6988 | */ | |
6989 | void md_check_recovery(mddev_t *mddev) | |
6990 | { | |
6991 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6992 | |
6993 | ||
5f40402d | 6994 | if (mddev->bitmap) |
aa5cbd10 | 6995 | bitmap_daemon_work(mddev); |
1da177e4 LT |
6996 | |
6997 | if (mddev->ro) | |
6998 | return; | |
fca4d848 N |
6999 | |
7000 | if (signal_pending(current)) { | |
31a59e34 | 7001 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
7002 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
7003 | mdname(mddev)); | |
7004 | mddev->safemode = 2; | |
7005 | } | |
7006 | flush_signals(current); | |
7007 | } | |
7008 | ||
c89a8eee N |
7009 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
7010 | return; | |
1da177e4 | 7011 | if ( ! ( |
e691063a | 7012 | (mddev->flags && !mddev->external) || |
1da177e4 | 7013 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 7014 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 7015 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
7016 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
7017 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
7018 | )) |
7019 | return; | |
fca4d848 | 7020 | |
df5b89b3 | 7021 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 7022 | int spares = 0; |
fca4d848 | 7023 | |
c89a8eee N |
7024 | if (mddev->ro) { |
7025 | /* Only thing we do on a ro array is remove | |
7026 | * failed devices. | |
7027 | */ | |
7028 | remove_and_add_spares(mddev); | |
7029 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7030 | goto unlock; | |
7031 | } | |
7032 | ||
31a59e34 | 7033 | if (!mddev->external) { |
0fd62b86 | 7034 | int did_change = 0; |
31a59e34 N |
7035 | spin_lock_irq(&mddev->write_lock); |
7036 | if (mddev->safemode && | |
7037 | !atomic_read(&mddev->writes_pending) && | |
7038 | !mddev->in_sync && | |
7039 | mddev->recovery_cp == MaxSector) { | |
7040 | mddev->in_sync = 1; | |
0fd62b86 | 7041 | did_change = 1; |
31a59e34 N |
7042 | if (mddev->persistent) |
7043 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
7044 | } | |
7045 | if (mddev->safemode == 1) | |
7046 | mddev->safemode = 0; | |
7047 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 7048 | if (did_change) |
b62b7590 | 7049 | sysfs_notify_dirent(mddev->sysfs_state); |
fca4d848 | 7050 | } |
fca4d848 | 7051 | |
850b2b42 N |
7052 | if (mddev->flags) |
7053 | md_update_sb(mddev, 0); | |
06d91a5f | 7054 | |
1da177e4 LT |
7055 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
7056 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
7057 | /* resync/recovery still happening */ | |
7058 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
7059 | goto unlock; | |
7060 | } | |
7061 | if (mddev->sync_thread) { | |
7062 | /* resync has finished, collect result */ | |
7063 | md_unregister_thread(mddev->sync_thread); | |
7064 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
7065 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
7066 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
7067 | /* success...*/ |
7068 | /* activate any spares */ | |
a99ac971 NB |
7069 | if (mddev->pers->spare_active(mddev)) |
7070 | sysfs_notify(&mddev->kobj, NULL, | |
7071 | "degraded"); | |
1da177e4 | 7072 | } |
cea9c228 N |
7073 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
7074 | mddev->pers->finish_reshape) | |
7075 | mddev->pers->finish_reshape(mddev); | |
850b2b42 | 7076 | md_update_sb(mddev, 1); |
41158c7e N |
7077 | |
7078 | /* if array is no-longer degraded, then any saved_raid_disk | |
7079 | * information must be scrapped | |
7080 | */ | |
7081 | if (!mddev->degraded) | |
159ec1fc | 7082 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
7083 | rdev->saved_raid_disk = -1; |
7084 | ||
1da177e4 LT |
7085 | mddev->recovery = 0; |
7086 | /* flag recovery needed just to double check */ | |
7087 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
0c3573f1 | 7088 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 7089 | md_new_event(mddev); |
1da177e4 LT |
7090 | goto unlock; |
7091 | } | |
72a23c21 NB |
7092 | /* Set RUNNING before clearing NEEDED to avoid |
7093 | * any transients in the value of "sync_action". | |
7094 | */ | |
7095 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7096 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
7097 | /* Clear some bits that don't mean anything, but |
7098 | * might be left set | |
7099 | */ | |
24dd469d N |
7100 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
7101 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 7102 | |
5fd6c1dc N |
7103 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
7104 | goto unlock; | |
1da177e4 LT |
7105 | /* no recovery is running. |
7106 | * remove any failed drives, then | |
7107 | * add spares if possible. | |
7108 | * Spare are also removed and re-added, to allow | |
7109 | * the personality to fail the re-add. | |
7110 | */ | |
1da177e4 | 7111 | |
b4c4c7b8 | 7112 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
7113 | if (mddev->pers->check_reshape == NULL || |
7114 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
7115 | /* Cannot proceed */ |
7116 | goto unlock; | |
7117 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 7118 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 7119 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
7120 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
7121 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 7122 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 7123 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7124 | } else if (mddev->recovery_cp < MaxSector) { |
7125 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 7126 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
7127 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
7128 | /* nothing to be done ... */ | |
1da177e4 | 7129 | goto unlock; |
24dd469d | 7130 | |
1da177e4 | 7131 | if (mddev->pers->sync_request) { |
a654b9d8 N |
7132 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
7133 | /* We are adding a device or devices to an array | |
7134 | * which has the bitmap stored on all devices. | |
7135 | * So make sure all bitmap pages get written | |
7136 | */ | |
7137 | bitmap_write_all(mddev->bitmap); | |
7138 | } | |
1da177e4 LT |
7139 | mddev->sync_thread = md_register_thread(md_do_sync, |
7140 | mddev, | |
0da3c619 | 7141 | "resync"); |
1da177e4 LT |
7142 | if (!mddev->sync_thread) { |
7143 | printk(KERN_ERR "%s: could not start resync" | |
7144 | " thread...\n", | |
7145 | mdname(mddev)); | |
7146 | /* leave the spares where they are, it shouldn't hurt */ | |
7147 | mddev->recovery = 0; | |
d7603b7e | 7148 | } else |
1da177e4 | 7149 | md_wakeup_thread(mddev->sync_thread); |
0c3573f1 | 7150 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 7151 | md_new_event(mddev); |
1da177e4 LT |
7152 | } |
7153 | unlock: | |
72a23c21 NB |
7154 | if (!mddev->sync_thread) { |
7155 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
7156 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
7157 | &mddev->recovery)) | |
0c3573f1 N |
7158 | if (mddev->sysfs_action) |
7159 | sysfs_notify_dirent(mddev->sysfs_action); | |
72a23c21 | 7160 | } |
1da177e4 LT |
7161 | mddev_unlock(mddev); |
7162 | } | |
7163 | } | |
7164 | ||
6bfe0b49 DW |
7165 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
7166 | { | |
3c0ee63a | 7167 | sysfs_notify_dirent(rdev->sysfs_state); |
6bfe0b49 DW |
7168 | wait_event_timeout(rdev->blocked_wait, |
7169 | !test_bit(Blocked, &rdev->flags), | |
7170 | msecs_to_jiffies(5000)); | |
7171 | rdev_dec_pending(rdev, mddev); | |
7172 | } | |
7173 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7174 | ||
75c96f85 AB |
7175 | static int md_notify_reboot(struct notifier_block *this, |
7176 | unsigned long code, void *x) | |
1da177e4 LT |
7177 | { |
7178 | struct list_head *tmp; | |
7179 | mddev_t *mddev; | |
7180 | ||
7181 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
7182 | ||
7183 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
7184 | ||
29ac4aa3 | 7185 | for_each_mddev(mddev, tmp) |
c71d4887 | 7186 | if (mddev_trylock(mddev)) { |
2b25000b N |
7187 | /* Force a switch to readonly even array |
7188 | * appears to still be in use. Hence | |
7189 | * the '100'. | |
7190 | */ | |
a4bd82d0 | 7191 | md_set_readonly(mddev, 100); |
c71d4887 NB |
7192 | mddev_unlock(mddev); |
7193 | } | |
1da177e4 LT |
7194 | /* |
7195 | * certain more exotic SCSI devices are known to be | |
7196 | * volatile wrt too early system reboots. While the | |
7197 | * right place to handle this issue is the given | |
7198 | * driver, we do want to have a safe RAID driver ... | |
7199 | */ | |
7200 | mdelay(1000*1); | |
7201 | } | |
7202 | return NOTIFY_DONE; | |
7203 | } | |
7204 | ||
75c96f85 | 7205 | static struct notifier_block md_notifier = { |
1da177e4 LT |
7206 | .notifier_call = md_notify_reboot, |
7207 | .next = NULL, | |
7208 | .priority = INT_MAX, /* before any real devices */ | |
7209 | }; | |
7210 | ||
7211 | static void md_geninit(void) | |
7212 | { | |
1da177e4 LT |
7213 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
7214 | ||
c7705f34 | 7215 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
7216 | } |
7217 | ||
75c96f85 | 7218 | static int __init md_init(void) |
1da177e4 | 7219 | { |
3dbd8c2e | 7220 | if (register_blkdev(MD_MAJOR, "md")) |
1da177e4 LT |
7221 | return -1; |
7222 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
3dbd8c2e | 7223 | unregister_blkdev(MD_MAJOR, "md"); |
1da177e4 LT |
7224 | return -1; |
7225 | } | |
3dbd8c2e | 7226 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
7227 | md_probe, NULL, NULL); |
7228 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
7229 | md_probe, NULL, NULL); |
7230 | ||
1da177e4 | 7231 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 7232 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
7233 | |
7234 | md_geninit(); | |
d710e138 | 7235 | return 0; |
1da177e4 LT |
7236 | } |
7237 | ||
7238 | ||
7239 | #ifndef MODULE | |
7240 | ||
7241 | /* | |
7242 | * Searches all registered partitions for autorun RAID arrays | |
7243 | * at boot time. | |
7244 | */ | |
4d936ec1 ME |
7245 | |
7246 | static LIST_HEAD(all_detected_devices); | |
7247 | struct detected_devices_node { | |
7248 | struct list_head list; | |
7249 | dev_t dev; | |
7250 | }; | |
1da177e4 LT |
7251 | |
7252 | void md_autodetect_dev(dev_t dev) | |
7253 | { | |
4d936ec1 ME |
7254 | struct detected_devices_node *node_detected_dev; |
7255 | ||
7256 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
7257 | if (node_detected_dev) { | |
7258 | node_detected_dev->dev = dev; | |
7259 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
7260 | } else { | |
7261 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
7262 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
7263 | } | |
1da177e4 LT |
7264 | } |
7265 | ||
7266 | ||
7267 | static void autostart_arrays(int part) | |
7268 | { | |
7269 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
7270 | struct detected_devices_node *node_detected_dev; |
7271 | dev_t dev; | |
7272 | int i_scanned, i_passed; | |
1da177e4 | 7273 | |
4d936ec1 ME |
7274 | i_scanned = 0; |
7275 | i_passed = 0; | |
1da177e4 | 7276 | |
4d936ec1 | 7277 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 7278 | |
4d936ec1 ME |
7279 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
7280 | i_scanned++; | |
7281 | node_detected_dev = list_entry(all_detected_devices.next, | |
7282 | struct detected_devices_node, list); | |
7283 | list_del(&node_detected_dev->list); | |
7284 | dev = node_detected_dev->dev; | |
7285 | kfree(node_detected_dev); | |
df968c4e | 7286 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
7287 | if (IS_ERR(rdev)) |
7288 | continue; | |
7289 | ||
b2d444d7 | 7290 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7291 | MD_BUG(); |
7292 | continue; | |
7293 | } | |
d0fae18f | 7294 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 7295 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 7296 | i_passed++; |
1da177e4 | 7297 | } |
4d936ec1 ME |
7298 | |
7299 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
7300 | i_scanned, i_passed); | |
1da177e4 LT |
7301 | |
7302 | autorun_devices(part); | |
7303 | } | |
7304 | ||
fdee8ae4 | 7305 | #endif /* !MODULE */ |
1da177e4 LT |
7306 | |
7307 | static __exit void md_exit(void) | |
7308 | { | |
7309 | mddev_t *mddev; | |
7310 | struct list_head *tmp; | |
8ab5e4c1 | 7311 | |
3dbd8c2e | 7312 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 7313 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 7314 | |
3dbd8c2e | 7315 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
7316 | unregister_blkdev(mdp_major, "mdp"); |
7317 | unregister_reboot_notifier(&md_notifier); | |
7318 | unregister_sysctl_table(raid_table_header); | |
7319 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 7320 | for_each_mddev(mddev, tmp) { |
1da177e4 | 7321 | export_array(mddev); |
d3374825 | 7322 | mddev->hold_active = 0; |
1da177e4 LT |
7323 | } |
7324 | } | |
7325 | ||
685784aa | 7326 | subsys_initcall(md_init); |
1da177e4 LT |
7327 | module_exit(md_exit) |
7328 | ||
f91de92e N |
7329 | static int get_ro(char *buffer, struct kernel_param *kp) |
7330 | { | |
7331 | return sprintf(buffer, "%d", start_readonly); | |
7332 | } | |
7333 | static int set_ro(const char *val, struct kernel_param *kp) | |
7334 | { | |
7335 | char *e; | |
7336 | int num = simple_strtoul(val, &e, 10); | |
7337 | if (*val && (*e == '\0' || *e == '\n')) { | |
7338 | start_readonly = num; | |
4dbcdc75 | 7339 | return 0; |
f91de92e N |
7340 | } |
7341 | return -EINVAL; | |
7342 | } | |
7343 | ||
80ca3a44 N |
7344 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
7345 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 7346 | |
efeb53c0 | 7347 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 7348 | |
1da177e4 LT |
7349 | EXPORT_SYMBOL(register_md_personality); |
7350 | EXPORT_SYMBOL(unregister_md_personality); | |
7351 | EXPORT_SYMBOL(md_error); | |
7352 | EXPORT_SYMBOL(md_done_sync); | |
7353 | EXPORT_SYMBOL(md_write_start); | |
7354 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
7355 | EXPORT_SYMBOL(md_register_thread); |
7356 | EXPORT_SYMBOL(md_unregister_thread); | |
7357 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
7358 | EXPORT_SYMBOL(md_check_recovery); |
7359 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 7360 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 7361 | MODULE_ALIAS("md"); |
72008652 | 7362 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |