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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
a6fb0934 | 35 | #include <linux/kthread.h> |
bff61975 | 36 | #include <linux/blkdev.h> |
1da177e4 | 37 | #include <linux/sysctl.h> |
bff61975 | 38 | #include <linux/seq_file.h> |
1da177e4 | 39 | #include <linux/buffer_head.h> /* for invalidate_bdev */ |
d7603b7e | 40 | #include <linux/poll.h> |
16f17b39 | 41 | #include <linux/ctype.h> |
fb4d8c76 N |
42 | #include <linux/hdreg.h> |
43 | #include <linux/proc_fs.h> | |
44 | #include <linux/random.h> | |
45 | #include <linux/reboot.h> | |
32a7627c | 46 | #include <linux/file.h> |
25570727 | 47 | #include <linux/delay.h> |
bff61975 N |
48 | #include <linux/raid/md_p.h> |
49 | #include <linux/raid/md_u.h> | |
43b2e5d8 | 50 | #include "md.h" |
ef740c37 | 51 | #include "bitmap.h" |
1da177e4 LT |
52 | |
53 | #define DEBUG 0 | |
54 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
55 | ||
56 | ||
57 | #ifndef MODULE | |
d710e138 | 58 | static void autostart_arrays(int part); |
1da177e4 LT |
59 | #endif |
60 | ||
2604b703 | 61 | static LIST_HEAD(pers_list); |
1da177e4 LT |
62 | static DEFINE_SPINLOCK(pers_lock); |
63 | ||
5e56341d AB |
64 | static void md_print_devices(void); |
65 | ||
90b08710 BS |
66 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
67 | ||
5e56341d AB |
68 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
69 | ||
1e50915f RB |
70 | /* |
71 | * Default number of read corrections we'll attempt on an rdev | |
72 | * before ejecting it from the array. We divide the read error | |
73 | * count by 2 for every hour elapsed between read errors. | |
74 | */ | |
75 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
76 | /* |
77 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
78 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
79 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 80 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
81 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
82 | * speed limit - in case reconstruction slows down your system despite | |
83 | * idle IO detection. | |
84 | * | |
85 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 86 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
87 | */ |
88 | ||
89 | static int sysctl_speed_limit_min = 1000; | |
90 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
91 | static inline int speed_min(mddev_t *mddev) |
92 | { | |
93 | return mddev->sync_speed_min ? | |
94 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
95 | } | |
96 | ||
97 | static inline int speed_max(mddev_t *mddev) | |
98 | { | |
99 | return mddev->sync_speed_max ? | |
100 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
101 | } | |
1da177e4 LT |
102 | |
103 | static struct ctl_table_header *raid_table_header; | |
104 | ||
105 | static ctl_table raid_table[] = { | |
106 | { | |
1da177e4 LT |
107 | .procname = "speed_limit_min", |
108 | .data = &sysctl_speed_limit_min, | |
109 | .maxlen = sizeof(int), | |
80ca3a44 | 110 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 111 | .proc_handler = proc_dointvec, |
1da177e4 LT |
112 | }, |
113 | { | |
1da177e4 LT |
114 | .procname = "speed_limit_max", |
115 | .data = &sysctl_speed_limit_max, | |
116 | .maxlen = sizeof(int), | |
80ca3a44 | 117 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 118 | .proc_handler = proc_dointvec, |
1da177e4 | 119 | }, |
894d2491 | 120 | { } |
1da177e4 LT |
121 | }; |
122 | ||
123 | static ctl_table raid_dir_table[] = { | |
124 | { | |
1da177e4 LT |
125 | .procname = "raid", |
126 | .maxlen = 0, | |
80ca3a44 | 127 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
128 | .child = raid_table, |
129 | }, | |
894d2491 | 130 | { } |
1da177e4 LT |
131 | }; |
132 | ||
133 | static ctl_table raid_root_table[] = { | |
134 | { | |
1da177e4 LT |
135 | .procname = "dev", |
136 | .maxlen = 0, | |
137 | .mode = 0555, | |
138 | .child = raid_dir_table, | |
139 | }, | |
894d2491 | 140 | { } |
1da177e4 LT |
141 | }; |
142 | ||
83d5cde4 | 143 | static const struct block_device_operations md_fops; |
1da177e4 | 144 | |
f91de92e N |
145 | static int start_readonly; |
146 | ||
d7603b7e N |
147 | /* |
148 | * We have a system wide 'event count' that is incremented | |
149 | * on any 'interesting' event, and readers of /proc/mdstat | |
150 | * can use 'poll' or 'select' to find out when the event | |
151 | * count increases. | |
152 | * | |
153 | * Events are: | |
154 | * start array, stop array, error, add device, remove device, | |
155 | * start build, activate spare | |
156 | */ | |
2989ddbd | 157 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 158 | static atomic_t md_event_count; |
29269553 | 159 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
160 | { |
161 | atomic_inc(&md_event_count); | |
162 | wake_up(&md_event_waiters); | |
163 | } | |
29269553 | 164 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 165 | |
c331eb04 N |
166 | /* Alternate version that can be called from interrupts |
167 | * when calling sysfs_notify isn't needed. | |
168 | */ | |
05381954 | 169 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
170 | { |
171 | atomic_inc(&md_event_count); | |
172 | wake_up(&md_event_waiters); | |
173 | } | |
174 | ||
1da177e4 LT |
175 | /* |
176 | * Enables to iterate over all existing md arrays | |
177 | * all_mddevs_lock protects this list. | |
178 | */ | |
179 | static LIST_HEAD(all_mddevs); | |
180 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
181 | ||
182 | ||
183 | /* | |
184 | * iterates through all used mddevs in the system. | |
185 | * We take care to grab the all_mddevs_lock whenever navigating | |
186 | * the list, and to always hold a refcount when unlocked. | |
187 | * Any code which breaks out of this loop while own | |
188 | * a reference to the current mddev and must mddev_put it. | |
189 | */ | |
29ac4aa3 | 190 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
191 | \ |
192 | for (({ spin_lock(&all_mddevs_lock); \ | |
193 | tmp = all_mddevs.next; \ | |
194 | mddev = NULL;}); \ | |
195 | ({ if (tmp != &all_mddevs) \ | |
196 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
197 | spin_unlock(&all_mddevs_lock); \ | |
198 | if (mddev) mddev_put(mddev); \ | |
199 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
200 | tmp != &all_mddevs;}); \ | |
201 | ({ spin_lock(&all_mddevs_lock); \ | |
202 | tmp = tmp->next;}) \ | |
203 | ) | |
204 | ||
205 | ||
409c57f3 N |
206 | /* Rather than calling directly into the personality make_request function, |
207 | * IO requests come here first so that we can check if the device is | |
208 | * being suspended pending a reconfiguration. | |
209 | * We hold a refcount over the call to ->make_request. By the time that | |
210 | * call has finished, the bio has been linked into some internal structure | |
211 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
212 | */ | |
213 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 214 | { |
409c57f3 N |
215 | mddev_t *mddev = q->queuedata; |
216 | int rv; | |
217 | if (mddev == NULL || mddev->pers == NULL) { | |
218 | bio_io_error(bio); | |
219 | return 0; | |
220 | } | |
221 | rcu_read_lock(); | |
a2826aa9 | 222 | if (mddev->suspended || mddev->barrier) { |
409c57f3 N |
223 | DEFINE_WAIT(__wait); |
224 | for (;;) { | |
225 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
226 | TASK_UNINTERRUPTIBLE); | |
a2826aa9 | 227 | if (!mddev->suspended && !mddev->barrier) |
409c57f3 N |
228 | break; |
229 | rcu_read_unlock(); | |
230 | schedule(); | |
231 | rcu_read_lock(); | |
232 | } | |
233 | finish_wait(&mddev->sb_wait, &__wait); | |
234 | } | |
235 | atomic_inc(&mddev->active_io); | |
236 | rcu_read_unlock(); | |
237 | rv = mddev->pers->make_request(q, bio); | |
238 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) | |
239 | wake_up(&mddev->sb_wait); | |
240 | ||
241 | return rv; | |
242 | } | |
243 | ||
244 | static void mddev_suspend(mddev_t *mddev) | |
245 | { | |
246 | BUG_ON(mddev->suspended); | |
247 | mddev->suspended = 1; | |
248 | synchronize_rcu(); | |
249 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
250 | mddev->pers->quiesce(mddev, 1); | |
251 | md_unregister_thread(mddev->thread); | |
252 | mddev->thread = NULL; | |
253 | /* we now know that no code is executing in the personality module, | |
254 | * except possibly the tail end of a ->bi_end_io function, but that | |
255 | * is certain to complete before the module has a chance to get | |
256 | * unloaded | |
257 | */ | |
258 | } | |
259 | ||
260 | static void mddev_resume(mddev_t *mddev) | |
261 | { | |
262 | mddev->suspended = 0; | |
263 | wake_up(&mddev->sb_wait); | |
264 | mddev->pers->quiesce(mddev, 0); | |
1da177e4 LT |
265 | } |
266 | ||
3fa841d7 N |
267 | int mddev_congested(mddev_t *mddev, int bits) |
268 | { | |
a2826aa9 N |
269 | if (mddev->barrier) |
270 | return 1; | |
3fa841d7 N |
271 | return mddev->suspended; |
272 | } | |
273 | EXPORT_SYMBOL(mddev_congested); | |
274 | ||
a2826aa9 N |
275 | /* |
276 | * Generic barrier handling for md | |
277 | */ | |
278 | ||
279 | #define POST_REQUEST_BARRIER ((void*)1) | |
280 | ||
281 | static void md_end_barrier(struct bio *bio, int err) | |
282 | { | |
283 | mdk_rdev_t *rdev = bio->bi_private; | |
284 | mddev_t *mddev = rdev->mddev; | |
285 | if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER) | |
286 | set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags); | |
287 | ||
288 | rdev_dec_pending(rdev, mddev); | |
289 | ||
290 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
291 | if (mddev->barrier == POST_REQUEST_BARRIER) { | |
292 | /* This was a post-request barrier */ | |
293 | mddev->barrier = NULL; | |
294 | wake_up(&mddev->sb_wait); | |
295 | } else | |
296 | /* The pre-request barrier has finished */ | |
297 | schedule_work(&mddev->barrier_work); | |
298 | } | |
299 | bio_put(bio); | |
300 | } | |
301 | ||
302 | static void submit_barriers(mddev_t *mddev) | |
303 | { | |
304 | mdk_rdev_t *rdev; | |
305 | ||
306 | rcu_read_lock(); | |
307 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
308 | if (rdev->raid_disk >= 0 && | |
309 | !test_bit(Faulty, &rdev->flags)) { | |
310 | /* Take two references, one is dropped | |
311 | * when request finishes, one after | |
312 | * we reclaim rcu_read_lock | |
313 | */ | |
314 | struct bio *bi; | |
315 | atomic_inc(&rdev->nr_pending); | |
316 | atomic_inc(&rdev->nr_pending); | |
317 | rcu_read_unlock(); | |
318 | bi = bio_alloc(GFP_KERNEL, 0); | |
319 | bi->bi_end_io = md_end_barrier; | |
320 | bi->bi_private = rdev; | |
321 | bi->bi_bdev = rdev->bdev; | |
322 | atomic_inc(&mddev->flush_pending); | |
323 | submit_bio(WRITE_BARRIER, bi); | |
324 | rcu_read_lock(); | |
325 | rdev_dec_pending(rdev, mddev); | |
326 | } | |
327 | rcu_read_unlock(); | |
328 | } | |
329 | ||
330 | static void md_submit_barrier(struct work_struct *ws) | |
331 | { | |
332 | mddev_t *mddev = container_of(ws, mddev_t, barrier_work); | |
333 | struct bio *bio = mddev->barrier; | |
334 | ||
335 | atomic_set(&mddev->flush_pending, 1); | |
336 | ||
337 | if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags)) | |
338 | bio_endio(bio, -EOPNOTSUPP); | |
339 | else if (bio->bi_size == 0) | |
340 | /* an empty barrier - all done */ | |
341 | bio_endio(bio, 0); | |
342 | else { | |
343 | bio->bi_rw &= ~(1<<BIO_RW_BARRIER); | |
344 | if (mddev->pers->make_request(mddev->queue, bio)) | |
345 | generic_make_request(bio); | |
346 | mddev->barrier = POST_REQUEST_BARRIER; | |
347 | submit_barriers(mddev); | |
348 | } | |
349 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
350 | mddev->barrier = NULL; | |
351 | wake_up(&mddev->sb_wait); | |
352 | } | |
353 | } | |
354 | ||
355 | void md_barrier_request(mddev_t *mddev, struct bio *bio) | |
356 | { | |
357 | spin_lock_irq(&mddev->write_lock); | |
358 | wait_event_lock_irq(mddev->sb_wait, | |
359 | !mddev->barrier, | |
360 | mddev->write_lock, /*nothing*/); | |
361 | mddev->barrier = bio; | |
362 | spin_unlock_irq(&mddev->write_lock); | |
363 | ||
364 | atomic_set(&mddev->flush_pending, 1); | |
365 | INIT_WORK(&mddev->barrier_work, md_submit_barrier); | |
366 | ||
367 | submit_barriers(mddev); | |
368 | ||
369 | if (atomic_dec_and_test(&mddev->flush_pending)) | |
370 | schedule_work(&mddev->barrier_work); | |
371 | } | |
372 | EXPORT_SYMBOL(md_barrier_request); | |
409c57f3 | 373 | |
1da177e4 LT |
374 | static inline mddev_t *mddev_get(mddev_t *mddev) |
375 | { | |
376 | atomic_inc(&mddev->active); | |
377 | return mddev; | |
378 | } | |
379 | ||
5fd3a17e | 380 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 381 | |
1da177e4 LT |
382 | static void mddev_put(mddev_t *mddev) |
383 | { | |
384 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
385 | return; | |
d3374825 N |
386 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
387 | !mddev->hold_active) { | |
1da177e4 | 388 | list_del(&mddev->all_mddevs); |
d3374825 N |
389 | if (mddev->gendisk) { |
390 | /* we did a probe so need to clean up. | |
391 | * Call schedule_work inside the spinlock | |
392 | * so that flush_scheduled_work() after | |
393 | * mddev_find will succeed in waiting for the | |
394 | * work to be done. | |
395 | */ | |
396 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
397 | schedule_work(&mddev->del_work); | |
398 | } else | |
399 | kfree(mddev); | |
400 | } | |
401 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
402 | } |
403 | ||
404 | static mddev_t * mddev_find(dev_t unit) | |
405 | { | |
406 | mddev_t *mddev, *new = NULL; | |
407 | ||
408 | retry: | |
409 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
410 | |
411 | if (unit) { | |
412 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
413 | if (mddev->unit == unit) { | |
414 | mddev_get(mddev); | |
415 | spin_unlock(&all_mddevs_lock); | |
416 | kfree(new); | |
417 | return mddev; | |
418 | } | |
419 | ||
420 | if (new) { | |
421 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 422 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
423 | new->hold_active = UNTIL_IOCTL; |
424 | return new; | |
1da177e4 | 425 | } |
efeb53c0 N |
426 | } else if (new) { |
427 | /* find an unused unit number */ | |
428 | static int next_minor = 512; | |
429 | int start = next_minor; | |
430 | int is_free = 0; | |
431 | int dev = 0; | |
432 | while (!is_free) { | |
433 | dev = MKDEV(MD_MAJOR, next_minor); | |
434 | next_minor++; | |
435 | if (next_minor > MINORMASK) | |
436 | next_minor = 0; | |
437 | if (next_minor == start) { | |
438 | /* Oh dear, all in use. */ | |
439 | spin_unlock(&all_mddevs_lock); | |
440 | kfree(new); | |
441 | return NULL; | |
442 | } | |
443 | ||
444 | is_free = 1; | |
445 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
446 | if (mddev->unit == dev) { | |
447 | is_free = 0; | |
448 | break; | |
449 | } | |
450 | } | |
451 | new->unit = dev; | |
452 | new->md_minor = MINOR(dev); | |
453 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
454 | list_add(&new->all_mddevs, &all_mddevs); |
455 | spin_unlock(&all_mddevs_lock); | |
456 | return new; | |
457 | } | |
458 | spin_unlock(&all_mddevs_lock); | |
459 | ||
9ffae0cf | 460 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
461 | if (!new) |
462 | return NULL; | |
463 | ||
1da177e4 LT |
464 | new->unit = unit; |
465 | if (MAJOR(unit) == MD_MAJOR) | |
466 | new->md_minor = MINOR(unit); | |
467 | else | |
468 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
469 | ||
c8c00a69 | 470 | mutex_init(&new->open_mutex); |
df5b89b3 | 471 | mutex_init(&new->reconfig_mutex); |
c3d9714e | 472 | mutex_init(&new->bitmap_info.mutex); |
1da177e4 LT |
473 | INIT_LIST_HEAD(&new->disks); |
474 | INIT_LIST_HEAD(&new->all_mddevs); | |
475 | init_timer(&new->safemode_timer); | |
476 | atomic_set(&new->active, 1); | |
f2ea68cf | 477 | atomic_set(&new->openers, 0); |
409c57f3 | 478 | atomic_set(&new->active_io, 0); |
06d91a5f | 479 | spin_lock_init(&new->write_lock); |
a2826aa9 | 480 | atomic_set(&new->flush_pending, 0); |
3d310eb7 | 481 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 482 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 483 | new->reshape_position = MaxSector; |
5e96ee65 | 484 | new->resync_min = 0; |
c6207277 | 485 | new->resync_max = MaxSector; |
d897dbf9 | 486 | new->level = LEVEL_NONE; |
1da177e4 | 487 | |
1da177e4 LT |
488 | goto retry; |
489 | } | |
490 | ||
491 | static inline int mddev_lock(mddev_t * mddev) | |
492 | { | |
df5b89b3 | 493 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
494 | } |
495 | ||
b522adcd DW |
496 | static inline int mddev_is_locked(mddev_t *mddev) |
497 | { | |
498 | return mutex_is_locked(&mddev->reconfig_mutex); | |
499 | } | |
500 | ||
1da177e4 LT |
501 | static inline int mddev_trylock(mddev_t * mddev) |
502 | { | |
df5b89b3 | 503 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
504 | } |
505 | ||
506 | static inline void mddev_unlock(mddev_t * mddev) | |
507 | { | |
df5b89b3 | 508 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 509 | |
005eca5e | 510 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
511 | } |
512 | ||
2989ddbd | 513 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 514 | { |
159ec1fc | 515 | mdk_rdev_t *rdev; |
1da177e4 | 516 | |
159ec1fc | 517 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
518 | if (rdev->desc_nr == nr) |
519 | return rdev; | |
159ec1fc | 520 | |
1da177e4 LT |
521 | return NULL; |
522 | } | |
523 | ||
524 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
525 | { | |
1da177e4 LT |
526 | mdk_rdev_t *rdev; |
527 | ||
159ec1fc | 528 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
529 | if (rdev->bdev->bd_dev == dev) |
530 | return rdev; | |
159ec1fc | 531 | |
1da177e4 LT |
532 | return NULL; |
533 | } | |
534 | ||
d9d166c2 | 535 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
536 | { |
537 | struct mdk_personality *pers; | |
d9d166c2 N |
538 | list_for_each_entry(pers, &pers_list, list) { |
539 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 540 | return pers; |
d9d166c2 N |
541 | if (strcmp(pers->name, clevel)==0) |
542 | return pers; | |
543 | } | |
2604b703 N |
544 | return NULL; |
545 | } | |
546 | ||
b73df2d3 | 547 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 548 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 549 | { |
b73df2d3 AN |
550 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
551 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
552 | } |
553 | ||
1da177e4 LT |
554 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
555 | { | |
556 | if (rdev->sb_page) | |
557 | MD_BUG(); | |
558 | ||
559 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
560 | if (!rdev->sb_page) { | |
561 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 562 | return -ENOMEM; |
1da177e4 LT |
563 | } |
564 | ||
565 | return 0; | |
566 | } | |
567 | ||
568 | static void free_disk_sb(mdk_rdev_t * rdev) | |
569 | { | |
570 | if (rdev->sb_page) { | |
2d1f3b5d | 571 | put_page(rdev->sb_page); |
1da177e4 LT |
572 | rdev->sb_loaded = 0; |
573 | rdev->sb_page = NULL; | |
0f420358 | 574 | rdev->sb_start = 0; |
dd8ac336 | 575 | rdev->sectors = 0; |
1da177e4 LT |
576 | } |
577 | } | |
578 | ||
579 | ||
6712ecf8 | 580 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
581 | { |
582 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 583 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 584 | |
3a0f5bbb N |
585 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
586 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
587 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
588 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 589 | md_error(mddev, rdev); |
3a0f5bbb | 590 | } |
7bfa19f2 | 591 | |
a9701a30 N |
592 | if (atomic_dec_and_test(&mddev->pending_writes)) |
593 | wake_up(&mddev->sb_wait); | |
f8b58edf | 594 | bio_put(bio); |
7bfa19f2 N |
595 | } |
596 | ||
6712ecf8 | 597 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
598 | { |
599 | struct bio *bio2 = bio->bi_private; | |
600 | mdk_rdev_t *rdev = bio2->bi_private; | |
601 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
602 | |
603 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
604 | error == -EOPNOTSUPP) { | |
605 | unsigned long flags; | |
606 | /* barriers don't appear to be supported :-( */ | |
607 | set_bit(BarriersNotsupp, &rdev->flags); | |
608 | mddev->barriers_work = 0; | |
609 | spin_lock_irqsave(&mddev->write_lock, flags); | |
610 | bio2->bi_next = mddev->biolist; | |
611 | mddev->biolist = bio2; | |
612 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
613 | wake_up(&mddev->sb_wait); | |
614 | bio_put(bio); | |
6712ecf8 N |
615 | } else { |
616 | bio_put(bio2); | |
617 | bio->bi_private = rdev; | |
618 | super_written(bio, error); | |
a9701a30 | 619 | } |
a9701a30 N |
620 | } |
621 | ||
7bfa19f2 N |
622 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
623 | sector_t sector, int size, struct page *page) | |
624 | { | |
625 | /* write first size bytes of page to sector of rdev | |
626 | * Increment mddev->pending_writes before returning | |
627 | * and decrement it on completion, waking up sb_wait | |
628 | * if zero is reached. | |
629 | * If an error occurred, call md_error | |
a9701a30 N |
630 | * |
631 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
632 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
633 | */ |
634 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
93dbb393 | 635 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); |
7bfa19f2 N |
636 | |
637 | bio->bi_bdev = rdev->bdev; | |
638 | bio->bi_sector = sector; | |
639 | bio_add_page(bio, page, size, 0); | |
640 | bio->bi_private = rdev; | |
641 | bio->bi_end_io = super_written; | |
a9701a30 N |
642 | bio->bi_rw = rw; |
643 | ||
7bfa19f2 | 644 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
645 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
646 | struct bio *rbio; | |
647 | rw |= (1<<BIO_RW_BARRIER); | |
648 | rbio = bio_clone(bio, GFP_NOIO); | |
649 | rbio->bi_private = bio; | |
650 | rbio->bi_end_io = super_written_barrier; | |
651 | submit_bio(rw, rbio); | |
652 | } else | |
653 | submit_bio(rw, bio); | |
654 | } | |
655 | ||
656 | void md_super_wait(mddev_t *mddev) | |
657 | { | |
658 | /* wait for all superblock writes that were scheduled to complete. | |
659 | * if any had to be retried (due to BARRIER problems), retry them | |
660 | */ | |
661 | DEFINE_WAIT(wq); | |
662 | for(;;) { | |
663 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
664 | if (atomic_read(&mddev->pending_writes)==0) | |
665 | break; | |
666 | while (mddev->biolist) { | |
667 | struct bio *bio; | |
668 | spin_lock_irq(&mddev->write_lock); | |
669 | bio = mddev->biolist; | |
670 | mddev->biolist = bio->bi_next ; | |
671 | bio->bi_next = NULL; | |
672 | spin_unlock_irq(&mddev->write_lock); | |
673 | submit_bio(bio->bi_rw, bio); | |
674 | } | |
675 | schedule(); | |
676 | } | |
677 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
678 | } |
679 | ||
6712ecf8 | 680 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 681 | { |
1da177e4 | 682 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
683 | } |
684 | ||
a654b9d8 | 685 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
686 | struct page *page, int rw) |
687 | { | |
baaa2c51 | 688 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
689 | struct completion event; |
690 | int ret; | |
691 | ||
93dbb393 | 692 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); |
1da177e4 LT |
693 | |
694 | bio->bi_bdev = bdev; | |
695 | bio->bi_sector = sector; | |
696 | bio_add_page(bio, page, size, 0); | |
697 | init_completion(&event); | |
698 | bio->bi_private = &event; | |
699 | bio->bi_end_io = bi_complete; | |
700 | submit_bio(rw, bio); | |
701 | wait_for_completion(&event); | |
702 | ||
703 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
704 | bio_put(bio); | |
705 | return ret; | |
706 | } | |
a8745db2 | 707 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 708 | |
0002b271 | 709 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
710 | { |
711 | char b[BDEVNAME_SIZE]; | |
712 | if (!rdev->sb_page) { | |
713 | MD_BUG(); | |
714 | return -EINVAL; | |
715 | } | |
716 | if (rdev->sb_loaded) | |
717 | return 0; | |
718 | ||
719 | ||
0f420358 | 720 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
721 | goto fail; |
722 | rdev->sb_loaded = 1; | |
723 | return 0; | |
724 | ||
725 | fail: | |
726 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
727 | bdevname(rdev->bdev,b)); | |
728 | return -EINVAL; | |
729 | } | |
730 | ||
731 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
732 | { | |
05710466 AN |
733 | return sb1->set_uuid0 == sb2->set_uuid0 && |
734 | sb1->set_uuid1 == sb2->set_uuid1 && | |
735 | sb1->set_uuid2 == sb2->set_uuid2 && | |
736 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
737 | } |
738 | ||
1da177e4 LT |
739 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
740 | { | |
741 | int ret; | |
742 | mdp_super_t *tmp1, *tmp2; | |
743 | ||
744 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
745 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
746 | ||
747 | if (!tmp1 || !tmp2) { | |
748 | ret = 0; | |
35020f1a | 749 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
750 | goto abort; |
751 | } | |
752 | ||
753 | *tmp1 = *sb1; | |
754 | *tmp2 = *sb2; | |
755 | ||
756 | /* | |
757 | * nr_disks is not constant | |
758 | */ | |
759 | tmp1->nr_disks = 0; | |
760 | tmp2->nr_disks = 0; | |
761 | ||
ce0c8e05 | 762 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 763 | abort: |
990a8baf JJ |
764 | kfree(tmp1); |
765 | kfree(tmp2); | |
1da177e4 LT |
766 | return ret; |
767 | } | |
768 | ||
4d167f09 N |
769 | |
770 | static u32 md_csum_fold(u32 csum) | |
771 | { | |
772 | csum = (csum & 0xffff) + (csum >> 16); | |
773 | return (csum & 0xffff) + (csum >> 16); | |
774 | } | |
775 | ||
1da177e4 LT |
776 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
777 | { | |
4d167f09 N |
778 | u64 newcsum = 0; |
779 | u32 *sb32 = (u32*)sb; | |
780 | int i; | |
1da177e4 LT |
781 | unsigned int disk_csum, csum; |
782 | ||
783 | disk_csum = sb->sb_csum; | |
784 | sb->sb_csum = 0; | |
4d167f09 N |
785 | |
786 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
787 | newcsum += sb32[i]; | |
788 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
789 | ||
790 | ||
791 | #ifdef CONFIG_ALPHA | |
792 | /* This used to use csum_partial, which was wrong for several | |
793 | * reasons including that different results are returned on | |
794 | * different architectures. It isn't critical that we get exactly | |
795 | * the same return value as before (we always csum_fold before | |
796 | * testing, and that removes any differences). However as we | |
797 | * know that csum_partial always returned a 16bit value on | |
798 | * alphas, do a fold to maximise conformity to previous behaviour. | |
799 | */ | |
800 | sb->sb_csum = md_csum_fold(disk_csum); | |
801 | #else | |
1da177e4 | 802 | sb->sb_csum = disk_csum; |
4d167f09 | 803 | #endif |
1da177e4 LT |
804 | return csum; |
805 | } | |
806 | ||
807 | ||
808 | /* | |
809 | * Handle superblock details. | |
810 | * We want to be able to handle multiple superblock formats | |
811 | * so we have a common interface to them all, and an array of | |
812 | * different handlers. | |
813 | * We rely on user-space to write the initial superblock, and support | |
814 | * reading and updating of superblocks. | |
815 | * Interface methods are: | |
816 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
817 | * loads and validates a superblock on dev. | |
818 | * if refdev != NULL, compare superblocks on both devices | |
819 | * Return: | |
820 | * 0 - dev has a superblock that is compatible with refdev | |
821 | * 1 - dev has a superblock that is compatible and newer than refdev | |
822 | * so dev should be used as the refdev in future | |
823 | * -EINVAL superblock incompatible or invalid | |
824 | * -othererror e.g. -EIO | |
825 | * | |
826 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
827 | * Verify that dev is acceptable into mddev. | |
828 | * The first time, mddev->raid_disks will be 0, and data from | |
829 | * dev should be merged in. Subsequent calls check that dev | |
830 | * is new enough. Return 0 or -EINVAL | |
831 | * | |
832 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
833 | * Update the superblock for rdev with data in mddev | |
834 | * This does not write to disc. | |
835 | * | |
836 | */ | |
837 | ||
838 | struct super_type { | |
0cd17fec CW |
839 | char *name; |
840 | struct module *owner; | |
841 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
842 | int minor_version); | |
843 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
844 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
845 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 846 | sector_t num_sectors); |
1da177e4 LT |
847 | }; |
848 | ||
0894cc30 AN |
849 | /* |
850 | * Check that the given mddev has no bitmap. | |
851 | * | |
852 | * This function is called from the run method of all personalities that do not | |
853 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
854 | * has a bitmap. Otherwise, it returns 0. | |
855 | * | |
856 | */ | |
857 | int md_check_no_bitmap(mddev_t *mddev) | |
858 | { | |
c3d9714e | 859 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
860 | return 0; |
861 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
862 | mdname(mddev), mddev->pers->name); | |
863 | return 1; | |
864 | } | |
865 | EXPORT_SYMBOL(md_check_no_bitmap); | |
866 | ||
1da177e4 LT |
867 | /* |
868 | * load_super for 0.90.0 | |
869 | */ | |
870 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
871 | { | |
872 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
873 | mdp_super_t *sb; | |
874 | int ret; | |
1da177e4 LT |
875 | |
876 | /* | |
0f420358 | 877 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
878 | * it's at the end of the disk. |
879 | * | |
880 | * It also happens to be a multiple of 4Kb. | |
881 | */ | |
0f420358 | 882 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 883 | |
0002b271 | 884 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
885 | if (ret) return ret; |
886 | ||
887 | ret = -EINVAL; | |
888 | ||
889 | bdevname(rdev->bdev, b); | |
890 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
891 | ||
892 | if (sb->md_magic != MD_SB_MAGIC) { | |
893 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
894 | b); | |
895 | goto abort; | |
896 | } | |
897 | ||
898 | if (sb->major_version != 0 || | |
f6705578 N |
899 | sb->minor_version < 90 || |
900 | sb->minor_version > 91) { | |
1da177e4 LT |
901 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
902 | sb->major_version, sb->minor_version, | |
903 | b); | |
904 | goto abort; | |
905 | } | |
906 | ||
907 | if (sb->raid_disks <= 0) | |
908 | goto abort; | |
909 | ||
4d167f09 | 910 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
911 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
912 | b); | |
913 | goto abort; | |
914 | } | |
915 | ||
916 | rdev->preferred_minor = sb->md_minor; | |
917 | rdev->data_offset = 0; | |
0002b271 | 918 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
919 | |
920 | if (sb->level == LEVEL_MULTIPATH) | |
921 | rdev->desc_nr = -1; | |
922 | else | |
923 | rdev->desc_nr = sb->this_disk.number; | |
924 | ||
9a7b2b0f | 925 | if (!refdev) { |
1da177e4 | 926 | ret = 1; |
9a7b2b0f | 927 | } else { |
1da177e4 LT |
928 | __u64 ev1, ev2; |
929 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
930 | if (!uuid_equal(refsb, sb)) { | |
931 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
932 | b, bdevname(refdev->bdev,b2)); | |
933 | goto abort; | |
934 | } | |
935 | if (!sb_equal(refsb, sb)) { | |
936 | printk(KERN_WARNING "md: %s has same UUID" | |
937 | " but different superblock to %s\n", | |
938 | b, bdevname(refdev->bdev, b2)); | |
939 | goto abort; | |
940 | } | |
941 | ev1 = md_event(sb); | |
942 | ev2 = md_event(refsb); | |
943 | if (ev1 > ev2) | |
944 | ret = 1; | |
945 | else | |
946 | ret = 0; | |
947 | } | |
8190e754 | 948 | rdev->sectors = rdev->sb_start; |
1da177e4 | 949 | |
dd8ac336 | 950 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
951 | /* "this cannot possibly happen" ... */ |
952 | ret = -EINVAL; | |
953 | ||
1da177e4 LT |
954 | abort: |
955 | return ret; | |
956 | } | |
957 | ||
958 | /* | |
959 | * validate_super for 0.90.0 | |
960 | */ | |
961 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
962 | { | |
963 | mdp_disk_t *desc; | |
964 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 965 | __u64 ev1 = md_event(sb); |
1da177e4 | 966 | |
41158c7e | 967 | rdev->raid_disk = -1; |
c5d79adb N |
968 | clear_bit(Faulty, &rdev->flags); |
969 | clear_bit(In_sync, &rdev->flags); | |
970 | clear_bit(WriteMostly, &rdev->flags); | |
971 | clear_bit(BarriersNotsupp, &rdev->flags); | |
972 | ||
1da177e4 LT |
973 | if (mddev->raid_disks == 0) { |
974 | mddev->major_version = 0; | |
975 | mddev->minor_version = sb->minor_version; | |
976 | mddev->patch_version = sb->patch_version; | |
e691063a | 977 | mddev->external = 0; |
9d8f0363 | 978 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
979 | mddev->ctime = sb->ctime; |
980 | mddev->utime = sb->utime; | |
981 | mddev->level = sb->level; | |
d9d166c2 | 982 | mddev->clevel[0] = 0; |
1da177e4 LT |
983 | mddev->layout = sb->layout; |
984 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 985 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 986 | mddev->events = ev1; |
c3d9714e N |
987 | mddev->bitmap_info.offset = 0; |
988 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 989 | |
f6705578 N |
990 | if (mddev->minor_version >= 91) { |
991 | mddev->reshape_position = sb->reshape_position; | |
992 | mddev->delta_disks = sb->delta_disks; | |
993 | mddev->new_level = sb->new_level; | |
994 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 995 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
996 | } else { |
997 | mddev->reshape_position = MaxSector; | |
998 | mddev->delta_disks = 0; | |
999 | mddev->new_level = mddev->level; | |
1000 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1001 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1002 | } |
1003 | ||
1da177e4 LT |
1004 | if (sb->state & (1<<MD_SB_CLEAN)) |
1005 | mddev->recovery_cp = MaxSector; | |
1006 | else { | |
1007 | if (sb->events_hi == sb->cp_events_hi && | |
1008 | sb->events_lo == sb->cp_events_lo) { | |
1009 | mddev->recovery_cp = sb->recovery_cp; | |
1010 | } else | |
1011 | mddev->recovery_cp = 0; | |
1012 | } | |
1013 | ||
1014 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1015 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1016 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1017 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1018 | ||
1019 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1020 | |
1021 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1022 | mddev->bitmap_info.file == NULL) |
1023 | mddev->bitmap_info.offset = | |
1024 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1025 | |
41158c7e N |
1026 | } else if (mddev->pers == NULL) { |
1027 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
1028 | ++ev1; |
1029 | if (ev1 < mddev->events) | |
1030 | return -EINVAL; | |
41158c7e N |
1031 | } else if (mddev->bitmap) { |
1032 | /* if adding to array with a bitmap, then we can accept an | |
1033 | * older device ... but not too old. | |
1034 | */ | |
41158c7e N |
1035 | if (ev1 < mddev->bitmap->events_cleared) |
1036 | return 0; | |
07d84d10 N |
1037 | } else { |
1038 | if (ev1 < mddev->events) | |
1039 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1040 | return 0; | |
1041 | } | |
41158c7e | 1042 | |
1da177e4 | 1043 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1044 | desc = sb->disks + rdev->desc_nr; |
1045 | ||
1046 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1047 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1048 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1049 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1050 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1051 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1052 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1053 | /* active but not in sync implies recovery up to | |
1054 | * reshape position. We don't know exactly where | |
1055 | * that is, so set to zero for now */ | |
1056 | if (mddev->minor_version >= 91) { | |
1057 | rdev->recovery_offset = 0; | |
1058 | rdev->raid_disk = desc->raid_disk; | |
1059 | } | |
1da177e4 | 1060 | } |
8ddf9efe N |
1061 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1062 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1063 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1064 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1065 | return 0; |
1066 | } | |
1067 | ||
1068 | /* | |
1069 | * sync_super for 0.90.0 | |
1070 | */ | |
1071 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1072 | { | |
1073 | mdp_super_t *sb; | |
1da177e4 LT |
1074 | mdk_rdev_t *rdev2; |
1075 | int next_spare = mddev->raid_disks; | |
19133a42 | 1076 | |
1da177e4 LT |
1077 | |
1078 | /* make rdev->sb match mddev data.. | |
1079 | * | |
1080 | * 1/ zero out disks | |
1081 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1082 | * 3/ any empty disks < next_spare become removed | |
1083 | * | |
1084 | * disks[0] gets initialised to REMOVED because | |
1085 | * we cannot be sure from other fields if it has | |
1086 | * been initialised or not. | |
1087 | */ | |
1088 | int i; | |
1089 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1090 | ||
61181565 N |
1091 | rdev->sb_size = MD_SB_BYTES; |
1092 | ||
1da177e4 LT |
1093 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
1094 | ||
1095 | memset(sb, 0, sizeof(*sb)); | |
1096 | ||
1097 | sb->md_magic = MD_SB_MAGIC; | |
1098 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1099 | sb->patch_version = mddev->patch_version; |
1100 | sb->gvalid_words = 0; /* ignored */ | |
1101 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1102 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1103 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1104 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1105 | ||
1106 | sb->ctime = mddev->ctime; | |
1107 | sb->level = mddev->level; | |
58c0fed4 | 1108 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1109 | sb->raid_disks = mddev->raid_disks; |
1110 | sb->md_minor = mddev->md_minor; | |
e691063a | 1111 | sb->not_persistent = 0; |
1da177e4 LT |
1112 | sb->utime = mddev->utime; |
1113 | sb->state = 0; | |
1114 | sb->events_hi = (mddev->events>>32); | |
1115 | sb->events_lo = (u32)mddev->events; | |
1116 | ||
f6705578 N |
1117 | if (mddev->reshape_position == MaxSector) |
1118 | sb->minor_version = 90; | |
1119 | else { | |
1120 | sb->minor_version = 91; | |
1121 | sb->reshape_position = mddev->reshape_position; | |
1122 | sb->new_level = mddev->new_level; | |
1123 | sb->delta_disks = mddev->delta_disks; | |
1124 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1125 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1126 | } |
1127 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1128 | if (mddev->in_sync) |
1129 | { | |
1130 | sb->recovery_cp = mddev->recovery_cp; | |
1131 | sb->cp_events_hi = (mddev->events>>32); | |
1132 | sb->cp_events_lo = (u32)mddev->events; | |
1133 | if (mddev->recovery_cp == MaxSector) | |
1134 | sb->state = (1<< MD_SB_CLEAN); | |
1135 | } else | |
1136 | sb->recovery_cp = 0; | |
1137 | ||
1138 | sb->layout = mddev->layout; | |
9d8f0363 | 1139 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1140 | |
c3d9714e | 1141 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1142 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1143 | ||
1da177e4 | 1144 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1145 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1146 | mdp_disk_t *d; |
86e6ffdd | 1147 | int desc_nr; |
0261cd9f N |
1148 | int is_active = test_bit(In_sync, &rdev2->flags); |
1149 | ||
1150 | if (rdev2->raid_disk >= 0 && | |
1151 | sb->minor_version >= 91) | |
1152 | /* we have nowhere to store the recovery_offset, | |
1153 | * but if it is not below the reshape_position, | |
1154 | * we can piggy-back on that. | |
1155 | */ | |
1156 | is_active = 1; | |
1157 | if (rdev2->raid_disk < 0 || | |
1158 | test_bit(Faulty, &rdev2->flags)) | |
1159 | is_active = 0; | |
1160 | if (is_active) | |
86e6ffdd | 1161 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1162 | else |
86e6ffdd | 1163 | desc_nr = next_spare++; |
19133a42 | 1164 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1165 | d = &sb->disks[rdev2->desc_nr]; |
1166 | nr_disks++; | |
1167 | d->number = rdev2->desc_nr; | |
1168 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1169 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1170 | if (is_active) |
1da177e4 LT |
1171 | d->raid_disk = rdev2->raid_disk; |
1172 | else | |
1173 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1174 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1175 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1176 | else if (is_active) { |
1da177e4 | 1177 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1178 | if (test_bit(In_sync, &rdev2->flags)) |
1179 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1180 | active++; |
1181 | working++; | |
1182 | } else { | |
1183 | d->state = 0; | |
1184 | spare++; | |
1185 | working++; | |
1186 | } | |
8ddf9efe N |
1187 | if (test_bit(WriteMostly, &rdev2->flags)) |
1188 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1189 | } |
1da177e4 LT |
1190 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1191 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1192 | mdp_disk_t *d = &sb->disks[i]; | |
1193 | if (d->state == 0 && d->number == 0) { | |
1194 | d->number = i; | |
1195 | d->raid_disk = i; | |
1196 | d->state = (1<<MD_DISK_REMOVED); | |
1197 | d->state |= (1<<MD_DISK_FAULTY); | |
1198 | failed++; | |
1199 | } | |
1200 | } | |
1201 | sb->nr_disks = nr_disks; | |
1202 | sb->active_disks = active; | |
1203 | sb->working_disks = working; | |
1204 | sb->failed_disks = failed; | |
1205 | sb->spare_disks = spare; | |
1206 | ||
1207 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1208 | sb->sb_csum = calc_sb_csum(sb); | |
1209 | } | |
1210 | ||
0cd17fec CW |
1211 | /* |
1212 | * rdev_size_change for 0.90.0 | |
1213 | */ | |
1214 | static unsigned long long | |
15f4a5fd | 1215 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1216 | { |
58c0fed4 | 1217 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1218 | return 0; /* component must fit device */ |
c3d9714e | 1219 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1220 | return 0; /* can't move bitmap */ |
0f420358 | 1221 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1222 | if (!num_sectors || num_sectors > rdev->sb_start) |
1223 | num_sectors = rdev->sb_start; | |
0f420358 | 1224 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1225 | rdev->sb_page); |
1226 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1227 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1228 | } |
1229 | ||
1230 | ||
1da177e4 LT |
1231 | /* |
1232 | * version 1 superblock | |
1233 | */ | |
1234 | ||
1c05b4bc | 1235 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1236 | { |
1c05b4bc N |
1237 | __le32 disk_csum; |
1238 | u32 csum; | |
1da177e4 LT |
1239 | unsigned long long newcsum; |
1240 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1241 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1242 | int i; |
1243 | ||
1244 | disk_csum = sb->sb_csum; | |
1245 | sb->sb_csum = 0; | |
1246 | newcsum = 0; | |
1247 | for (i=0; size>=4; size -= 4 ) | |
1248 | newcsum += le32_to_cpu(*isuper++); | |
1249 | ||
1250 | if (size == 2) | |
1c05b4bc | 1251 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1252 | |
1253 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1254 | sb->sb_csum = disk_csum; | |
1255 | return cpu_to_le32(csum); | |
1256 | } | |
1257 | ||
1258 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1259 | { | |
1260 | struct mdp_superblock_1 *sb; | |
1261 | int ret; | |
0f420358 | 1262 | sector_t sb_start; |
1da177e4 | 1263 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1264 | int bmask; |
1da177e4 LT |
1265 | |
1266 | /* | |
0f420358 | 1267 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1268 | * It is always aligned to a 4K boundary and |
1269 | * depeding on minor_version, it can be: | |
1270 | * 0: At least 8K, but less than 12K, from end of device | |
1271 | * 1: At start of device | |
1272 | * 2: 4K from start of device. | |
1273 | */ | |
1274 | switch(minor_version) { | |
1275 | case 0: | |
0f420358 AN |
1276 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1277 | sb_start -= 8*2; | |
1278 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1279 | break; |
1280 | case 1: | |
0f420358 | 1281 | sb_start = 0; |
1da177e4 LT |
1282 | break; |
1283 | case 2: | |
0f420358 | 1284 | sb_start = 8; |
1da177e4 LT |
1285 | break; |
1286 | default: | |
1287 | return -EINVAL; | |
1288 | } | |
0f420358 | 1289 | rdev->sb_start = sb_start; |
1da177e4 | 1290 | |
0002b271 N |
1291 | /* superblock is rarely larger than 1K, but it can be larger, |
1292 | * and it is safe to read 4k, so we do that | |
1293 | */ | |
1294 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1295 | if (ret) return ret; |
1296 | ||
1297 | ||
1298 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1299 | ||
1300 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1301 | sb->major_version != cpu_to_le32(1) || | |
1302 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1303 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1304 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1305 | return -EINVAL; |
1306 | ||
1307 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1308 | printk("md: invalid superblock checksum on %s\n", | |
1309 | bdevname(rdev->bdev,b)); | |
1310 | return -EINVAL; | |
1311 | } | |
1312 | if (le64_to_cpu(sb->data_size) < 10) { | |
1313 | printk("md: data_size too small on %s\n", | |
1314 | bdevname(rdev->bdev,b)); | |
1315 | return -EINVAL; | |
1316 | } | |
e11e93fa | 1317 | |
1da177e4 LT |
1318 | rdev->preferred_minor = 0xffff; |
1319 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1320 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1321 | |
0002b271 | 1322 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1323 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1324 | if (rdev->sb_size & bmask) |
a1801f85 N |
1325 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1326 | ||
1327 | if (minor_version | |
0f420358 | 1328 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1329 | return -EINVAL; |
0002b271 | 1330 | |
31b65a0d N |
1331 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1332 | rdev->desc_nr = -1; | |
1333 | else | |
1334 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1335 | ||
9a7b2b0f | 1336 | if (!refdev) { |
8ed75463 | 1337 | ret = 1; |
9a7b2b0f | 1338 | } else { |
1da177e4 LT |
1339 | __u64 ev1, ev2; |
1340 | struct mdp_superblock_1 *refsb = | |
1341 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1342 | ||
1343 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1344 | sb->level != refsb->level || | |
1345 | sb->layout != refsb->layout || | |
1346 | sb->chunksize != refsb->chunksize) { | |
1347 | printk(KERN_WARNING "md: %s has strangely different" | |
1348 | " superblock to %s\n", | |
1349 | bdevname(rdev->bdev,b), | |
1350 | bdevname(refdev->bdev,b2)); | |
1351 | return -EINVAL; | |
1352 | } | |
1353 | ev1 = le64_to_cpu(sb->events); | |
1354 | ev2 = le64_to_cpu(refsb->events); | |
1355 | ||
1356 | if (ev1 > ev2) | |
8ed75463 N |
1357 | ret = 1; |
1358 | else | |
1359 | ret = 0; | |
1da177e4 | 1360 | } |
a1801f85 | 1361 | if (minor_version) |
dd8ac336 AN |
1362 | rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - |
1363 | le64_to_cpu(sb->data_offset); | |
1da177e4 | 1364 | else |
dd8ac336 AN |
1365 | rdev->sectors = rdev->sb_start; |
1366 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1367 | return -EINVAL; |
dd8ac336 | 1368 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1369 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1370 | return -EINVAL; |
8ed75463 | 1371 | return ret; |
1da177e4 LT |
1372 | } |
1373 | ||
1374 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1375 | { | |
1376 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1377 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1378 | |
41158c7e | 1379 | rdev->raid_disk = -1; |
c5d79adb N |
1380 | clear_bit(Faulty, &rdev->flags); |
1381 | clear_bit(In_sync, &rdev->flags); | |
1382 | clear_bit(WriteMostly, &rdev->flags); | |
1383 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1384 | ||
1da177e4 LT |
1385 | if (mddev->raid_disks == 0) { |
1386 | mddev->major_version = 1; | |
1387 | mddev->patch_version = 0; | |
e691063a | 1388 | mddev->external = 0; |
9d8f0363 | 1389 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1390 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1391 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1392 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1393 | mddev->clevel[0] = 0; |
1da177e4 LT |
1394 | mddev->layout = le32_to_cpu(sb->layout); |
1395 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1396 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1397 | mddev->events = ev1; |
c3d9714e N |
1398 | mddev->bitmap_info.offset = 0; |
1399 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1400 | |
1401 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1402 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1403 | ||
1404 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1405 | |
71c0805c | 1406 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1407 | mddev->bitmap_info.file == NULL ) |
1408 | mddev->bitmap_info.offset = | |
1409 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1410 | |
f6705578 N |
1411 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1412 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1413 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1414 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1415 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1416 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1417 | } else { |
1418 | mddev->reshape_position = MaxSector; | |
1419 | mddev->delta_disks = 0; | |
1420 | mddev->new_level = mddev->level; | |
1421 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1422 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1423 | } |
1424 | ||
41158c7e N |
1425 | } else if (mddev->pers == NULL) { |
1426 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1427 | ++ev1; |
1428 | if (ev1 < mddev->events) | |
1429 | return -EINVAL; | |
41158c7e N |
1430 | } else if (mddev->bitmap) { |
1431 | /* If adding to array with a bitmap, then we can accept an | |
1432 | * older device, but not too old. | |
1433 | */ | |
41158c7e N |
1434 | if (ev1 < mddev->bitmap->events_cleared) |
1435 | return 0; | |
07d84d10 N |
1436 | } else { |
1437 | if (ev1 < mddev->events) | |
1438 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1439 | return 0; | |
1440 | } | |
1da177e4 LT |
1441 | if (mddev->level != LEVEL_MULTIPATH) { |
1442 | int role; | |
3673f305 N |
1443 | if (rdev->desc_nr < 0 || |
1444 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1445 | role = 0xffff; | |
1446 | rdev->desc_nr = -1; | |
1447 | } else | |
1448 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1449 | switch(role) { |
1450 | case 0xffff: /* spare */ | |
1da177e4 LT |
1451 | break; |
1452 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1453 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1454 | break; |
1455 | default: | |
5fd6c1dc N |
1456 | if ((le32_to_cpu(sb->feature_map) & |
1457 | MD_FEATURE_RECOVERY_OFFSET)) | |
1458 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1459 | else | |
1460 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1461 | rdev->raid_disk = role; |
1462 | break; | |
1463 | } | |
8ddf9efe N |
1464 | if (sb->devflags & WriteMostly1) |
1465 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1466 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1467 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1468 | |
1da177e4 LT |
1469 | return 0; |
1470 | } | |
1471 | ||
1472 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1473 | { | |
1474 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1475 | mdk_rdev_t *rdev2; |
1476 | int max_dev, i; | |
1477 | /* make rdev->sb match mddev and rdev data. */ | |
1478 | ||
1479 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1480 | ||
1481 | sb->feature_map = 0; | |
1482 | sb->pad0 = 0; | |
5fd6c1dc | 1483 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1484 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1485 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1486 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1487 | ||
1488 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1489 | sb->events = cpu_to_le64(mddev->events); | |
1490 | if (mddev->in_sync) | |
1491 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1492 | else | |
1493 | sb->resync_offset = cpu_to_le64(0); | |
1494 | ||
1c05b4bc | 1495 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1496 | |
f0ca340c | 1497 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1498 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1499 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1500 | sb->level = cpu_to_le32(mddev->level); |
1501 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1502 | |
c3d9714e N |
1503 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1504 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1505 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1506 | } |
5fd6c1dc N |
1507 | |
1508 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1509 | !test_bit(In_sync, &rdev->flags)) { |
97e4f42d N |
1510 | if (rdev->recovery_offset > 0) { |
1511 | sb->feature_map |= | |
1512 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1513 | sb->recovery_offset = | |
1514 | cpu_to_le64(rdev->recovery_offset); | |
1515 | } | |
5fd6c1dc N |
1516 | } |
1517 | ||
f6705578 N |
1518 | if (mddev->reshape_position != MaxSector) { |
1519 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1520 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1521 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1522 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1523 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1524 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1525 | } |
a654b9d8 | 1526 | |
1da177e4 | 1527 | max_dev = 0; |
159ec1fc | 1528 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1529 | if (rdev2->desc_nr+1 > max_dev) |
1530 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1531 | |
70471daf N |
1532 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1533 | int bmask; | |
a778b73f | 1534 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1535 | rdev->sb_size = max_dev * 2 + 256; |
1536 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1537 | if (rdev->sb_size & bmask) | |
1538 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
1539 | } | |
1da177e4 LT |
1540 | for (i=0; i<max_dev;i++) |
1541 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1542 | ||
159ec1fc | 1543 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1544 | i = rdev2->desc_nr; |
b2d444d7 | 1545 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1546 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1547 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1548 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
5fd6c1dc N |
1549 | else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0) |
1550 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); | |
1da177e4 LT |
1551 | else |
1552 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1553 | } | |
1554 | ||
1da177e4 LT |
1555 | sb->sb_csum = calc_sb_1_csum(sb); |
1556 | } | |
1557 | ||
0cd17fec | 1558 | static unsigned long long |
15f4a5fd | 1559 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1560 | { |
1561 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1562 | sector_t max_sectors; |
58c0fed4 | 1563 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1564 | return 0; /* component must fit device */ |
0f420358 | 1565 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1566 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1567 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1568 | max_sectors -= rdev->data_offset; | |
1569 | if (!num_sectors || num_sectors > max_sectors) | |
1570 | num_sectors = max_sectors; | |
c3d9714e | 1571 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1572 | /* minor version 0 with bitmap we can't move */ |
1573 | return 0; | |
1574 | } else { | |
1575 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1576 | sector_t sb_start; |
1577 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1578 | sb_start &= ~(sector_t)(4*2 - 1); | |
dd8ac336 | 1579 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1580 | if (!num_sectors || num_sectors > max_sectors) |
1581 | num_sectors = max_sectors; | |
0f420358 | 1582 | rdev->sb_start = sb_start; |
0cd17fec CW |
1583 | } |
1584 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1585 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1586 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1587 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1588 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1589 | rdev->sb_page); |
1590 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1591 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1592 | } |
1da177e4 | 1593 | |
75c96f85 | 1594 | static struct super_type super_types[] = { |
1da177e4 LT |
1595 | [0] = { |
1596 | .name = "0.90.0", | |
1597 | .owner = THIS_MODULE, | |
0cd17fec CW |
1598 | .load_super = super_90_load, |
1599 | .validate_super = super_90_validate, | |
1600 | .sync_super = super_90_sync, | |
1601 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1602 | }, |
1603 | [1] = { | |
1604 | .name = "md-1", | |
1605 | .owner = THIS_MODULE, | |
0cd17fec CW |
1606 | .load_super = super_1_load, |
1607 | .validate_super = super_1_validate, | |
1608 | .sync_super = super_1_sync, | |
1609 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1610 | }, |
1611 | }; | |
1da177e4 LT |
1612 | |
1613 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1614 | { | |
7dd5e7c3 | 1615 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1616 | |
4b80991c N |
1617 | rcu_read_lock(); |
1618 | rdev_for_each_rcu(rdev, mddev1) | |
1619 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1620 | if (rdev->bdev->bd_contains == |
4b80991c N |
1621 | rdev2->bdev->bd_contains) { |
1622 | rcu_read_unlock(); | |
7dd5e7c3 | 1623 | return 1; |
4b80991c N |
1624 | } |
1625 | rcu_read_unlock(); | |
1da177e4 LT |
1626 | return 0; |
1627 | } | |
1628 | ||
1629 | static LIST_HEAD(pending_raid_disks); | |
1630 | ||
ac5e7113 AN |
1631 | /* |
1632 | * Try to register data integrity profile for an mddev | |
1633 | * | |
1634 | * This is called when an array is started and after a disk has been kicked | |
1635 | * from the array. It only succeeds if all working and active component devices | |
1636 | * are integrity capable with matching profiles. | |
1637 | */ | |
1638 | int md_integrity_register(mddev_t *mddev) | |
1639 | { | |
1640 | mdk_rdev_t *rdev, *reference = NULL; | |
1641 | ||
1642 | if (list_empty(&mddev->disks)) | |
1643 | return 0; /* nothing to do */ | |
1644 | if (blk_get_integrity(mddev->gendisk)) | |
1645 | return 0; /* already registered */ | |
1646 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1647 | /* skip spares and non-functional disks */ | |
1648 | if (test_bit(Faulty, &rdev->flags)) | |
1649 | continue; | |
1650 | if (rdev->raid_disk < 0) | |
1651 | continue; | |
1652 | /* | |
1653 | * If at least one rdev is not integrity capable, we can not | |
1654 | * enable data integrity for the md device. | |
1655 | */ | |
1656 | if (!bdev_get_integrity(rdev->bdev)) | |
1657 | return -EINVAL; | |
1658 | if (!reference) { | |
1659 | /* Use the first rdev as the reference */ | |
1660 | reference = rdev; | |
1661 | continue; | |
1662 | } | |
1663 | /* does this rdev's profile match the reference profile? */ | |
1664 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1665 | rdev->bdev->bd_disk) < 0) | |
1666 | return -EINVAL; | |
1667 | } | |
1668 | /* | |
1669 | * All component devices are integrity capable and have matching | |
1670 | * profiles, register the common profile for the md device. | |
1671 | */ | |
1672 | if (blk_integrity_register(mddev->gendisk, | |
1673 | bdev_get_integrity(reference->bdev)) != 0) { | |
1674 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1675 | mdname(mddev)); | |
1676 | return -EINVAL; | |
1677 | } | |
1678 | printk(KERN_NOTICE "md: data integrity on %s enabled\n", | |
1679 | mdname(mddev)); | |
1680 | return 0; | |
1681 | } | |
1682 | EXPORT_SYMBOL(md_integrity_register); | |
1683 | ||
1684 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1685 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1686 | { |
3f9d99c1 | 1687 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1688 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1689 | |
ac5e7113 | 1690 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1691 | return; |
ac5e7113 | 1692 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1693 | return; |
ac5e7113 AN |
1694 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1695 | rdev->bdev->bd_disk) >= 0) | |
1696 | return; | |
1697 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1698 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1699 | } |
ac5e7113 | 1700 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1701 | |
1da177e4 LT |
1702 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1703 | { | |
7dd5e7c3 | 1704 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1705 | struct kobject *ko; |
1edf80d3 | 1706 | char *s; |
5e55e2f5 | 1707 | int err; |
1da177e4 LT |
1708 | |
1709 | if (rdev->mddev) { | |
1710 | MD_BUG(); | |
1711 | return -EINVAL; | |
1712 | } | |
11e2ede0 DW |
1713 | |
1714 | /* prevent duplicates */ | |
1715 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1716 | return -EEXIST; | |
1717 | ||
dd8ac336 AN |
1718 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1719 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1720 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1721 | if (mddev->pers) { |
1722 | /* Cannot change size, so fail | |
1723 | * If mddev->level <= 0, then we don't care | |
1724 | * about aligning sizes (e.g. linear) | |
1725 | */ | |
1726 | if (mddev->level > 0) | |
1727 | return -ENOSPC; | |
1728 | } else | |
dd8ac336 | 1729 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1730 | } |
1da177e4 LT |
1731 | |
1732 | /* Verify rdev->desc_nr is unique. | |
1733 | * If it is -1, assign a free number, else | |
1734 | * check number is not in use | |
1735 | */ | |
1736 | if (rdev->desc_nr < 0) { | |
1737 | int choice = 0; | |
1738 | if (mddev->pers) choice = mddev->raid_disks; | |
1739 | while (find_rdev_nr(mddev, choice)) | |
1740 | choice++; | |
1741 | rdev->desc_nr = choice; | |
1742 | } else { | |
1743 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1744 | return -EBUSY; | |
1745 | } | |
de01dfad N |
1746 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1747 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1748 | mdname(mddev), mddev->max_disks); | |
1749 | return -EBUSY; | |
1750 | } | |
19133a42 | 1751 | bdevname(rdev->bdev,b); |
649316b2 | 1752 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1753 | *s = '!'; |
649316b2 | 1754 | |
1da177e4 | 1755 | rdev->mddev = mddev; |
19133a42 | 1756 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1757 | |
b2d6db58 | 1758 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1759 | goto fail; |
86e6ffdd | 1760 | |
0762b8bd | 1761 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1762 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1763 | kobject_del(&rdev->kobj); | |
1764 | goto fail; | |
1765 | } | |
3c0ee63a N |
1766 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); |
1767 | ||
4b80991c | 1768 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1769 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1770 | |
1771 | /* May as well allow recovery to be retried once */ | |
1772 | mddev->recovery_disabled = 0; | |
3f9d99c1 | 1773 | |
1da177e4 | 1774 | return 0; |
5e55e2f5 N |
1775 | |
1776 | fail: | |
1777 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1778 | b, mdname(mddev)); | |
1779 | return err; | |
1da177e4 LT |
1780 | } |
1781 | ||
177a99b2 | 1782 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1783 | { |
1784 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1785 | kobject_del(&rdev->kobj); | |
177a99b2 | 1786 | kobject_put(&rdev->kobj); |
5792a285 N |
1787 | } |
1788 | ||
1da177e4 LT |
1789 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1790 | { | |
1791 | char b[BDEVNAME_SIZE]; | |
1792 | if (!rdev->mddev) { | |
1793 | MD_BUG(); | |
1794 | return; | |
1795 | } | |
5463c790 | 1796 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1797 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1798 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1799 | rdev->mddev = NULL; | |
86e6ffdd | 1800 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1801 | sysfs_put(rdev->sysfs_state); |
1802 | rdev->sysfs_state = NULL; | |
5792a285 | 1803 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1804 | * writing to 'remove' to "dev/state". We also need |
1805 | * to delay it due to rcu usage. | |
5792a285 | 1806 | */ |
4b80991c | 1807 | synchronize_rcu(); |
177a99b2 N |
1808 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1809 | kobject_get(&rdev->kobj); | |
5792a285 | 1810 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1811 | } |
1812 | ||
1813 | /* | |
1814 | * prevent the device from being mounted, repartitioned or | |
1815 | * otherwise reused by a RAID array (or any other kernel | |
1816 | * subsystem), by bd_claiming the device. | |
1817 | */ | |
c5d79adb | 1818 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1819 | { |
1820 | int err = 0; | |
1821 | struct block_device *bdev; | |
1822 | char b[BDEVNAME_SIZE]; | |
1823 | ||
2e7b651d | 1824 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1825 | if (IS_ERR(bdev)) { |
1826 | printk(KERN_ERR "md: could not open %s.\n", | |
1827 | __bdevname(dev, b)); | |
1828 | return PTR_ERR(bdev); | |
1829 | } | |
c5d79adb | 1830 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1831 | if (err) { |
1832 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1833 | bdevname(bdev, b)); | |
9a1c3542 | 1834 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1835 | return err; |
1836 | } | |
c5d79adb N |
1837 | if (!shared) |
1838 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1839 | rdev->bdev = bdev; |
1840 | return err; | |
1841 | } | |
1842 | ||
1843 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1844 | { | |
1845 | struct block_device *bdev = rdev->bdev; | |
1846 | rdev->bdev = NULL; | |
1847 | if (!bdev) | |
1848 | MD_BUG(); | |
1849 | bd_release(bdev); | |
9a1c3542 | 1850 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1851 | } |
1852 | ||
1853 | void md_autodetect_dev(dev_t dev); | |
1854 | ||
1855 | static void export_rdev(mdk_rdev_t * rdev) | |
1856 | { | |
1857 | char b[BDEVNAME_SIZE]; | |
1858 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1859 | bdevname(rdev->bdev,b)); | |
1860 | if (rdev->mddev) | |
1861 | MD_BUG(); | |
1862 | free_disk_sb(rdev); | |
1da177e4 | 1863 | #ifndef MODULE |
d0fae18f N |
1864 | if (test_bit(AutoDetected, &rdev->flags)) |
1865 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1866 | #endif |
1867 | unlock_rdev(rdev); | |
86e6ffdd | 1868 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1869 | } |
1870 | ||
1871 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1872 | { | |
1873 | unbind_rdev_from_array(rdev); | |
1874 | export_rdev(rdev); | |
1875 | } | |
1876 | ||
1877 | static void export_array(mddev_t *mddev) | |
1878 | { | |
159ec1fc | 1879 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1880 | |
d089c6af | 1881 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1882 | if (!rdev->mddev) { |
1883 | MD_BUG(); | |
1884 | continue; | |
1885 | } | |
1886 | kick_rdev_from_array(rdev); | |
1887 | } | |
1888 | if (!list_empty(&mddev->disks)) | |
1889 | MD_BUG(); | |
1890 | mddev->raid_disks = 0; | |
1891 | mddev->major_version = 0; | |
1892 | } | |
1893 | ||
1894 | static void print_desc(mdp_disk_t *desc) | |
1895 | { | |
1896 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1897 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1898 | } | |
1899 | ||
cd2ac932 | 1900 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1901 | { |
1902 | int i; | |
1903 | ||
1904 | printk(KERN_INFO | |
1905 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1906 | sb->major_version, sb->minor_version, sb->patch_version, | |
1907 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1908 | sb->ctime); | |
1909 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1910 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1911 | sb->md_minor, sb->layout, sb->chunk_size); | |
1912 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1913 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1914 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1915 | sb->failed_disks, sb->spare_disks, | |
1916 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1917 | ||
1918 | printk(KERN_INFO); | |
1919 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1920 | mdp_disk_t *desc; | |
1921 | ||
1922 | desc = sb->disks + i; | |
1923 | if (desc->number || desc->major || desc->minor || | |
1924 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1925 | printk(" D %2d: ", i); | |
1926 | print_desc(desc); | |
1927 | } | |
1928 | } | |
1929 | printk(KERN_INFO "md: THIS: "); | |
1930 | print_desc(&sb->this_disk); | |
cd2ac932 | 1931 | } |
1da177e4 | 1932 | |
cd2ac932 CR |
1933 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1934 | { | |
1935 | __u8 *uuid; | |
1936 | ||
1937 | uuid = sb->set_uuid; | |
ad361c98 JP |
1938 | printk(KERN_INFO |
1939 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" | |
1940 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" | |
1941 | "md: Name: \"%s\" CT:%llu\n", | |
cd2ac932 CR |
1942 | le32_to_cpu(sb->major_version), |
1943 | le32_to_cpu(sb->feature_map), | |
1944 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1945 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1946 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1947 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1948 | sb->set_name, | |
1949 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1950 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1951 | ||
1952 | uuid = sb->device_uuid; | |
ad361c98 JP |
1953 | printk(KERN_INFO |
1954 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 1955 | " RO:%llu\n" |
ad361c98 JP |
1956 | "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" |
1957 | ":%02x%02x%02x%02x%02x%02x\n" | |
1958 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" | |
1959 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
1960 | le32_to_cpu(sb->level), |
1961 | (unsigned long long)le64_to_cpu(sb->size), | |
1962 | le32_to_cpu(sb->raid_disks), | |
1963 | le32_to_cpu(sb->layout), | |
1964 | le32_to_cpu(sb->chunksize), | |
1965 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
1966 | (unsigned long long)le64_to_cpu(sb->data_size), | |
1967 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
1968 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
1969 | le32_to_cpu(sb->dev_number), | |
1970 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1971 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1972 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1973 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1974 | sb->devflags, | |
1975 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
1976 | (unsigned long long)le64_to_cpu(sb->events), | |
1977 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
1978 | le32_to_cpu(sb->sb_csum), | |
1979 | le32_to_cpu(sb->max_dev) | |
1980 | ); | |
1da177e4 LT |
1981 | } |
1982 | ||
cd2ac932 | 1983 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
1984 | { |
1985 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
1986 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
1987 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
1988 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1989 | rdev->desc_nr); | |
1da177e4 | 1990 | if (rdev->sb_loaded) { |
cd2ac932 CR |
1991 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
1992 | switch (major_version) { | |
1993 | case 0: | |
1994 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
1995 | break; | |
1996 | case 1: | |
1997 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
1998 | break; | |
1999 | } | |
1da177e4 LT |
2000 | } else |
2001 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2002 | } | |
2003 | ||
5e56341d | 2004 | static void md_print_devices(void) |
1da177e4 | 2005 | { |
159ec1fc | 2006 | struct list_head *tmp; |
1da177e4 LT |
2007 | mdk_rdev_t *rdev; |
2008 | mddev_t *mddev; | |
2009 | char b[BDEVNAME_SIZE]; | |
2010 | ||
2011 | printk("\n"); | |
2012 | printk("md: **********************************\n"); | |
2013 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2014 | printk("md: **********************************\n"); | |
29ac4aa3 | 2015 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2016 | |
32a7627c N |
2017 | if (mddev->bitmap) |
2018 | bitmap_print_sb(mddev->bitmap); | |
2019 | else | |
2020 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2021 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2022 | printk("<%s>", bdevname(rdev->bdev,b)); |
2023 | printk("\n"); | |
2024 | ||
159ec1fc | 2025 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2026 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2027 | } |
2028 | printk("md: **********************************\n"); | |
2029 | printk("\n"); | |
2030 | } | |
2031 | ||
2032 | ||
42543769 | 2033 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2034 | { |
42543769 N |
2035 | /* Update each superblock (in-memory image), but |
2036 | * if we are allowed to, skip spares which already | |
2037 | * have the right event counter, or have one earlier | |
2038 | * (which would mean they aren't being marked as dirty | |
2039 | * with the rest of the array) | |
2040 | */ | |
1da177e4 | 2041 | mdk_rdev_t *rdev; |
1da177e4 | 2042 | |
5e865106 N |
2043 | /* First make sure individual recovery_offsets are correct */ |
2044 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2045 | if (rdev->raid_disk >= 0 && | |
2046 | !test_bit(In_sync, &rdev->flags) && | |
2047 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2048 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2049 | ||
2050 | } | |
159ec1fc | 2051 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2052 | if (rdev->sb_events == mddev->events || |
2053 | (nospares && | |
2054 | rdev->raid_disk < 0 && | |
2055 | (rdev->sb_events&1)==0 && | |
2056 | rdev->sb_events+1 == mddev->events)) { | |
2057 | /* Don't update this superblock */ | |
2058 | rdev->sb_loaded = 2; | |
2059 | } else { | |
2060 | super_types[mddev->major_version]. | |
2061 | sync_super(mddev, rdev); | |
2062 | rdev->sb_loaded = 1; | |
2063 | } | |
1da177e4 LT |
2064 | } |
2065 | } | |
2066 | ||
850b2b42 | 2067 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2068 | { |
1da177e4 | 2069 | mdk_rdev_t *rdev; |
06d91a5f | 2070 | int sync_req; |
42543769 | 2071 | int nospares = 0; |
1da177e4 | 2072 | |
1b57f132 | 2073 | mddev->utime = get_seconds(); |
8377bc80 N |
2074 | if (mddev->external) |
2075 | return; | |
1da177e4 | 2076 | repeat: |
a9701a30 | 2077 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2078 | |
850b2b42 N |
2079 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2080 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
2081 | force_change = 1; | |
2082 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2083 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2084 | * though if events isn't the right even/odd, we will have to do | |
2085 | * spares after all | |
2086 | */ | |
2087 | nospares = 1; | |
2088 | if (force_change) | |
2089 | nospares = 0; | |
2090 | if (mddev->degraded) | |
84692195 N |
2091 | /* If the array is degraded, then skipping spares is both |
2092 | * dangerous and fairly pointless. | |
2093 | * Dangerous because a device that was removed from the array | |
2094 | * might have a event_count that still looks up-to-date, | |
2095 | * so it can be re-added without a resync. | |
2096 | * Pointless because if there are any spares to skip, | |
2097 | * then a recovery will happen and soon that array won't | |
2098 | * be degraded any more and the spare can go back to sleep then. | |
2099 | */ | |
850b2b42 | 2100 | nospares = 0; |
84692195 | 2101 | |
06d91a5f | 2102 | sync_req = mddev->in_sync; |
42543769 N |
2103 | |
2104 | /* If this is just a dirty<->clean transition, and the array is clean | |
2105 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2106 | if (nospares |
42543769 | 2107 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
2108 | && (mddev->events & 1) |
2109 | && mddev->events != 1) | |
42543769 N |
2110 | mddev->events--; |
2111 | else { | |
2112 | /* otherwise we have to go forward and ... */ | |
2113 | mddev->events ++; | |
2114 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
51d5668c N |
2115 | /* .. if the array isn't clean, an 'even' event must also go |
2116 | * to spares. */ | |
2117 | if ((mddev->events&1)==0) | |
42543769 | 2118 | nospares = 0; |
42543769 | 2119 | } else { |
51d5668c N |
2120 | /* otherwise an 'odd' event must go to spares */ |
2121 | if ((mddev->events&1)) | |
42543769 | 2122 | nospares = 0; |
42543769 N |
2123 | } |
2124 | } | |
1da177e4 LT |
2125 | |
2126 | if (!mddev->events) { | |
2127 | /* | |
2128 | * oops, this 64-bit counter should never wrap. | |
2129 | * Either we are in around ~1 trillion A.C., assuming | |
2130 | * 1 reboot per second, or we have a bug: | |
2131 | */ | |
2132 | MD_BUG(); | |
2133 | mddev->events --; | |
2134 | } | |
1da177e4 LT |
2135 | |
2136 | /* | |
2137 | * do not write anything to disk if using | |
2138 | * nonpersistent superblocks | |
2139 | */ | |
06d91a5f | 2140 | if (!mddev->persistent) { |
e691063a N |
2141 | if (!mddev->external) |
2142 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
2143 | ||
a9701a30 | 2144 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2145 | wake_up(&mddev->sb_wait); |
1da177e4 | 2146 | return; |
06d91a5f | 2147 | } |
e691063a | 2148 | sync_sbs(mddev, nospares); |
a9701a30 | 2149 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2150 | |
2151 | dprintk(KERN_INFO | |
2152 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2153 | mdname(mddev),mddev->in_sync); | |
2154 | ||
4ad13663 | 2155 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2156 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2157 | char b[BDEVNAME_SIZE]; |
2158 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2159 | if (rdev->sb_loaded != 1) |
2160 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2161 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2162 | dprintk("(skipping faulty "); |
2163 | ||
2164 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2165 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2166 | md_super_write(mddev,rdev, |
0f420358 | 2167 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2168 | rdev->sb_page); |
2169 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2170 | bdevname(rdev->bdev,b), | |
0f420358 | 2171 | (unsigned long long)rdev->sb_start); |
42543769 | 2172 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2173 | |
1da177e4 LT |
2174 | } else |
2175 | dprintk(")\n"); | |
7bfa19f2 | 2176 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2177 | /* only need to write one superblock... */ |
2178 | break; | |
2179 | } | |
a9701a30 | 2180 | md_super_wait(mddev); |
850b2b42 | 2181 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2182 | |
a9701a30 | 2183 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2184 | if (mddev->in_sync != sync_req || |
2185 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2186 | /* have to write it out again */ |
a9701a30 | 2187 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2188 | goto repeat; |
2189 | } | |
850b2b42 | 2190 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2191 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2192 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2193 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2194 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2195 | |
1da177e4 LT |
2196 | } |
2197 | ||
7f6ce769 | 2198 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2199 | * We want to accept with case. For this we use cmd_match. |
2200 | */ | |
2201 | static int cmd_match(const char *cmd, const char *str) | |
2202 | { | |
2203 | /* See if cmd, written into a sysfs file, matches | |
2204 | * str. They must either be the same, or cmd can | |
2205 | * have a trailing newline | |
2206 | */ | |
2207 | while (*cmd && *str && *cmd == *str) { | |
2208 | cmd++; | |
2209 | str++; | |
2210 | } | |
2211 | if (*cmd == '\n') | |
2212 | cmd++; | |
2213 | if (*str || *cmd) | |
2214 | return 0; | |
2215 | return 1; | |
2216 | } | |
2217 | ||
86e6ffdd N |
2218 | struct rdev_sysfs_entry { |
2219 | struct attribute attr; | |
2220 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2221 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2222 | }; | |
2223 | ||
2224 | static ssize_t | |
96de1e66 | 2225 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2226 | { |
2227 | char *sep = ""; | |
20a49ff6 | 2228 | size_t len = 0; |
86e6ffdd | 2229 | |
b2d444d7 | 2230 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2231 | len+= sprintf(page+len, "%sfaulty",sep); |
2232 | sep = ","; | |
2233 | } | |
b2d444d7 | 2234 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2235 | len += sprintf(page+len, "%sin_sync",sep); |
2236 | sep = ","; | |
2237 | } | |
f655675b N |
2238 | if (test_bit(WriteMostly, &rdev->flags)) { |
2239 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2240 | sep = ","; | |
2241 | } | |
6bfe0b49 DW |
2242 | if (test_bit(Blocked, &rdev->flags)) { |
2243 | len += sprintf(page+len, "%sblocked", sep); | |
2244 | sep = ","; | |
2245 | } | |
b2d444d7 N |
2246 | if (!test_bit(Faulty, &rdev->flags) && |
2247 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2248 | len += sprintf(page+len, "%sspare", sep); |
2249 | sep = ","; | |
2250 | } | |
2251 | return len+sprintf(page+len, "\n"); | |
2252 | } | |
2253 | ||
45dc2de1 N |
2254 | static ssize_t |
2255 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2256 | { | |
2257 | /* can write | |
2258 | * faulty - simulates and error | |
2259 | * remove - disconnects the device | |
f655675b N |
2260 | * writemostly - sets write_mostly |
2261 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2262 | * blocked - sets the Blocked flag |
2263 | * -blocked - clears the Blocked flag | |
6d56e278 | 2264 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2265 | */ |
2266 | int err = -EINVAL; | |
2267 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2268 | md_error(rdev->mddev, rdev); | |
2269 | err = 0; | |
2270 | } else if (cmd_match(buf, "remove")) { | |
2271 | if (rdev->raid_disk >= 0) | |
2272 | err = -EBUSY; | |
2273 | else { | |
2274 | mddev_t *mddev = rdev->mddev; | |
2275 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2276 | if (mddev->pers) |
2277 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2278 | md_new_event(mddev); |
2279 | err = 0; | |
2280 | } | |
f655675b N |
2281 | } else if (cmd_match(buf, "writemostly")) { |
2282 | set_bit(WriteMostly, &rdev->flags); | |
2283 | err = 0; | |
2284 | } else if (cmd_match(buf, "-writemostly")) { | |
2285 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2286 | err = 0; |
2287 | } else if (cmd_match(buf, "blocked")) { | |
2288 | set_bit(Blocked, &rdev->flags); | |
2289 | err = 0; | |
2290 | } else if (cmd_match(buf, "-blocked")) { | |
2291 | clear_bit(Blocked, &rdev->flags); | |
2292 | wake_up(&rdev->blocked_wait); | |
2293 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2294 | md_wakeup_thread(rdev->mddev->thread); | |
2295 | ||
6d56e278 N |
2296 | err = 0; |
2297 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2298 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2299 | err = 0; |
45dc2de1 | 2300 | } |
3c0ee63a N |
2301 | if (!err && rdev->sysfs_state) |
2302 | sysfs_notify_dirent(rdev->sysfs_state); | |
45dc2de1 N |
2303 | return err ? err : len; |
2304 | } | |
80ca3a44 N |
2305 | static struct rdev_sysfs_entry rdev_state = |
2306 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2307 | |
4dbcdc75 N |
2308 | static ssize_t |
2309 | errors_show(mdk_rdev_t *rdev, char *page) | |
2310 | { | |
2311 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2312 | } | |
2313 | ||
2314 | static ssize_t | |
2315 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2316 | { | |
2317 | char *e; | |
2318 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2319 | if (*buf && (*e == 0 || *e == '\n')) { | |
2320 | atomic_set(&rdev->corrected_errors, n); | |
2321 | return len; | |
2322 | } | |
2323 | return -EINVAL; | |
2324 | } | |
2325 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2326 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2327 | |
014236d2 N |
2328 | static ssize_t |
2329 | slot_show(mdk_rdev_t *rdev, char *page) | |
2330 | { | |
2331 | if (rdev->raid_disk < 0) | |
2332 | return sprintf(page, "none\n"); | |
2333 | else | |
2334 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2335 | } | |
2336 | ||
2337 | static ssize_t | |
2338 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2339 | { | |
2340 | char *e; | |
c303da6d N |
2341 | int err; |
2342 | char nm[20]; | |
014236d2 N |
2343 | int slot = simple_strtoul(buf, &e, 10); |
2344 | if (strncmp(buf, "none", 4)==0) | |
2345 | slot = -1; | |
2346 | else if (e==buf || (*e && *e!= '\n')) | |
2347 | return -EINVAL; | |
6c2fce2e | 2348 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2349 | /* Setting 'slot' on an active array requires also |
2350 | * updating the 'rd%d' link, and communicating | |
2351 | * with the personality with ->hot_*_disk. | |
2352 | * For now we only support removing | |
2353 | * failed/spare devices. This normally happens automatically, | |
2354 | * but not when the metadata is externally managed. | |
2355 | */ | |
c303da6d N |
2356 | if (rdev->raid_disk == -1) |
2357 | return -EEXIST; | |
2358 | /* personality does all needed checks */ | |
2359 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2360 | return -EINVAL; | |
2361 | err = rdev->mddev->pers-> | |
2362 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2363 | if (err) | |
2364 | return err; | |
2365 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2366 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2367 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2368 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2369 | } else if (rdev->mddev->pers) { |
2370 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2371 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2372 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2373 | */ |
2374 | ||
2375 | if (rdev->raid_disk != -1) | |
2376 | return -EBUSY; | |
2377 | ||
2378 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2379 | return -EINVAL; | |
2380 | ||
159ec1fc | 2381 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2382 | if (rdev2->raid_disk == slot) |
2383 | return -EEXIST; | |
2384 | ||
2385 | rdev->raid_disk = slot; | |
2386 | if (test_bit(In_sync, &rdev->flags)) | |
2387 | rdev->saved_raid_disk = slot; | |
2388 | else | |
2389 | rdev->saved_raid_disk = -1; | |
2390 | err = rdev->mddev->pers-> | |
2391 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2392 | if (err) { |
6c2fce2e | 2393 | rdev->raid_disk = -1; |
6c2fce2e | 2394 | return err; |
52664732 | 2395 | } else |
3c0ee63a | 2396 | sysfs_notify_dirent(rdev->sysfs_state); |
6c2fce2e NB |
2397 | sprintf(nm, "rd%d", rdev->raid_disk); |
2398 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2399 | printk(KERN_WARNING | |
2400 | "md: cannot register " | |
2401 | "%s for %s\n", | |
2402 | nm, mdname(rdev->mddev)); | |
2403 | ||
2404 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2405 | } else { |
2406 | if (slot >= rdev->mddev->raid_disks) | |
2407 | return -ENOSPC; | |
2408 | rdev->raid_disk = slot; | |
2409 | /* assume it is working */ | |
c5d79adb N |
2410 | clear_bit(Faulty, &rdev->flags); |
2411 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2412 | set_bit(In_sync, &rdev->flags); |
3c0ee63a | 2413 | sysfs_notify_dirent(rdev->sysfs_state); |
c303da6d | 2414 | } |
014236d2 N |
2415 | return len; |
2416 | } | |
2417 | ||
2418 | ||
2419 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2420 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2421 | |
93c8cad0 N |
2422 | static ssize_t |
2423 | offset_show(mdk_rdev_t *rdev, char *page) | |
2424 | { | |
6961ece4 | 2425 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2426 | } |
2427 | ||
2428 | static ssize_t | |
2429 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2430 | { | |
2431 | char *e; | |
2432 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2433 | if (e==buf || (*e && *e != '\n')) | |
2434 | return -EINVAL; | |
8ed0a521 | 2435 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2436 | return -EBUSY; |
dd8ac336 | 2437 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2438 | /* Must set offset before size, so overlap checks |
2439 | * can be sane */ | |
2440 | return -EBUSY; | |
93c8cad0 N |
2441 | rdev->data_offset = offset; |
2442 | return len; | |
2443 | } | |
2444 | ||
2445 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2446 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2447 | |
83303b61 N |
2448 | static ssize_t |
2449 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2450 | { | |
dd8ac336 | 2451 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2452 | } |
2453 | ||
c5d79adb N |
2454 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2455 | { | |
2456 | /* check if two start/length pairs overlap */ | |
2457 | if (s1+l1 <= s2) | |
2458 | return 0; | |
2459 | if (s2+l2 <= s1) | |
2460 | return 0; | |
2461 | return 1; | |
2462 | } | |
2463 | ||
b522adcd DW |
2464 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2465 | { | |
2466 | unsigned long long blocks; | |
2467 | sector_t new; | |
2468 | ||
2469 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2470 | return -EINVAL; | |
2471 | ||
2472 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2473 | return -EINVAL; /* sector conversion overflow */ | |
2474 | ||
2475 | new = blocks * 2; | |
2476 | if (new != blocks * 2) | |
2477 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2478 | ||
2479 | *sectors = new; | |
2480 | return 0; | |
2481 | } | |
2482 | ||
83303b61 N |
2483 | static ssize_t |
2484 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2485 | { | |
27c529bb | 2486 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2487 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2488 | sector_t sectors; |
27c529bb | 2489 | |
b522adcd | 2490 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2491 | return -EINVAL; |
0cd17fec | 2492 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2493 | if (my_mddev->persistent) { |
dd8ac336 AN |
2494 | sectors = super_types[my_mddev->major_version]. |
2495 | rdev_size_change(rdev, sectors); | |
2496 | if (!sectors) | |
0cd17fec | 2497 | return -EBUSY; |
dd8ac336 AN |
2498 | } else if (!sectors) |
2499 | sectors = (rdev->bdev->bd_inode->i_size >> 9) - | |
2500 | rdev->data_offset; | |
0cd17fec | 2501 | } |
dd8ac336 | 2502 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2503 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2504 | |
dd8ac336 AN |
2505 | rdev->sectors = sectors; |
2506 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2507 | /* need to check that all other rdevs with the same ->bdev |
2508 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2509 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2510 | * we have to change it back, we will have the lock again. |
2511 | */ | |
2512 | mddev_t *mddev; | |
2513 | int overlap = 0; | |
159ec1fc | 2514 | struct list_head *tmp; |
c5d79adb | 2515 | |
27c529bb | 2516 | mddev_unlock(my_mddev); |
29ac4aa3 | 2517 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2518 | mdk_rdev_t *rdev2; |
2519 | ||
2520 | mddev_lock(mddev); | |
159ec1fc | 2521 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2522 | if (test_bit(AllReserved, &rdev2->flags) || |
2523 | (rdev->bdev == rdev2->bdev && | |
2524 | rdev != rdev2 && | |
dd8ac336 | 2525 | overlaps(rdev->data_offset, rdev->sectors, |
d07bd3bc | 2526 | rdev2->data_offset, |
dd8ac336 | 2527 | rdev2->sectors))) { |
c5d79adb N |
2528 | overlap = 1; |
2529 | break; | |
2530 | } | |
2531 | mddev_unlock(mddev); | |
2532 | if (overlap) { | |
2533 | mddev_put(mddev); | |
2534 | break; | |
2535 | } | |
2536 | } | |
27c529bb | 2537 | mddev_lock(my_mddev); |
c5d79adb N |
2538 | if (overlap) { |
2539 | /* Someone else could have slipped in a size | |
2540 | * change here, but doing so is just silly. | |
dd8ac336 | 2541 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2542 | * safe, and trust userspace not to race with |
2543 | * itself | |
2544 | */ | |
dd8ac336 | 2545 | rdev->sectors = oldsectors; |
c5d79adb N |
2546 | return -EBUSY; |
2547 | } | |
2548 | } | |
83303b61 N |
2549 | return len; |
2550 | } | |
2551 | ||
2552 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2553 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2554 | |
86e6ffdd N |
2555 | static struct attribute *rdev_default_attrs[] = { |
2556 | &rdev_state.attr, | |
4dbcdc75 | 2557 | &rdev_errors.attr, |
014236d2 | 2558 | &rdev_slot.attr, |
93c8cad0 | 2559 | &rdev_offset.attr, |
83303b61 | 2560 | &rdev_size.attr, |
86e6ffdd N |
2561 | NULL, |
2562 | }; | |
2563 | static ssize_t | |
2564 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2565 | { | |
2566 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2567 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2568 | mddev_t *mddev = rdev->mddev; |
2569 | ssize_t rv; | |
86e6ffdd N |
2570 | |
2571 | if (!entry->show) | |
2572 | return -EIO; | |
27c529bb N |
2573 | |
2574 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2575 | if (!rv) { | |
2576 | if (rdev->mddev == NULL) | |
2577 | rv = -EBUSY; | |
2578 | else | |
2579 | rv = entry->show(rdev, page); | |
2580 | mddev_unlock(mddev); | |
2581 | } | |
2582 | return rv; | |
86e6ffdd N |
2583 | } |
2584 | ||
2585 | static ssize_t | |
2586 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2587 | const char *page, size_t length) | |
2588 | { | |
2589 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2590 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2591 | ssize_t rv; |
2592 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2593 | |
2594 | if (!entry->store) | |
2595 | return -EIO; | |
67463acb N |
2596 | if (!capable(CAP_SYS_ADMIN)) |
2597 | return -EACCES; | |
27c529bb | 2598 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2599 | if (!rv) { |
27c529bb N |
2600 | if (rdev->mddev == NULL) |
2601 | rv = -EBUSY; | |
2602 | else | |
2603 | rv = entry->store(rdev, page, length); | |
6a51830e | 2604 | mddev_unlock(mddev); |
ca388059 N |
2605 | } |
2606 | return rv; | |
86e6ffdd N |
2607 | } |
2608 | ||
2609 | static void rdev_free(struct kobject *ko) | |
2610 | { | |
2611 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2612 | kfree(rdev); | |
2613 | } | |
2614 | static struct sysfs_ops rdev_sysfs_ops = { | |
2615 | .show = rdev_attr_show, | |
2616 | .store = rdev_attr_store, | |
2617 | }; | |
2618 | static struct kobj_type rdev_ktype = { | |
2619 | .release = rdev_free, | |
2620 | .sysfs_ops = &rdev_sysfs_ops, | |
2621 | .default_attrs = rdev_default_attrs, | |
2622 | }; | |
2623 | ||
1da177e4 LT |
2624 | /* |
2625 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2626 | * | |
2627 | * mark the device faulty if: | |
2628 | * | |
2629 | * - the device is nonexistent (zero size) | |
2630 | * - the device has no valid superblock | |
2631 | * | |
2632 | * a faulty rdev _never_ has rdev->sb set. | |
2633 | */ | |
2634 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2635 | { | |
2636 | char b[BDEVNAME_SIZE]; | |
2637 | int err; | |
2638 | mdk_rdev_t *rdev; | |
2639 | sector_t size; | |
2640 | ||
9ffae0cf | 2641 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2642 | if (!rdev) { |
2643 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2644 | return ERR_PTR(-ENOMEM); | |
2645 | } | |
1da177e4 LT |
2646 | |
2647 | if ((err = alloc_disk_sb(rdev))) | |
2648 | goto abort_free; | |
2649 | ||
c5d79adb | 2650 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2651 | if (err) |
2652 | goto abort_free; | |
2653 | ||
f9cb074b | 2654 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2655 | |
1da177e4 | 2656 | rdev->desc_nr = -1; |
2b6e8459 | 2657 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2658 | rdev->raid_disk = -1; |
b2d444d7 | 2659 | rdev->flags = 0; |
1da177e4 | 2660 | rdev->data_offset = 0; |
42543769 | 2661 | rdev->sb_events = 0; |
1e50915f RB |
2662 | rdev->last_read_error.tv_sec = 0; |
2663 | rdev->last_read_error.tv_nsec = 0; | |
1da177e4 | 2664 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2665 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2666 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2667 | |
2668 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2669 | if (!size) { | |
2670 | printk(KERN_WARNING | |
2671 | "md: %s has zero or unknown size, marking faulty!\n", | |
2672 | bdevname(rdev->bdev,b)); | |
2673 | err = -EINVAL; | |
2674 | goto abort_free; | |
2675 | } | |
2676 | ||
2677 | if (super_format >= 0) { | |
2678 | err = super_types[super_format]. | |
2679 | load_super(rdev, NULL, super_minor); | |
2680 | if (err == -EINVAL) { | |
df968c4e N |
2681 | printk(KERN_WARNING |
2682 | "md: %s does not have a valid v%d.%d " | |
2683 | "superblock, not importing!\n", | |
2684 | bdevname(rdev->bdev,b), | |
2685 | super_format, super_minor); | |
1da177e4 LT |
2686 | goto abort_free; |
2687 | } | |
2688 | if (err < 0) { | |
2689 | printk(KERN_WARNING | |
2690 | "md: could not read %s's sb, not importing!\n", | |
2691 | bdevname(rdev->bdev,b)); | |
2692 | goto abort_free; | |
2693 | } | |
2694 | } | |
6bfe0b49 | 2695 | |
1da177e4 | 2696 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2697 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2698 | |
2699 | return rdev; | |
2700 | ||
2701 | abort_free: | |
2702 | if (rdev->sb_page) { | |
2703 | if (rdev->bdev) | |
2704 | unlock_rdev(rdev); | |
2705 | free_disk_sb(rdev); | |
2706 | } | |
2707 | kfree(rdev); | |
2708 | return ERR_PTR(err); | |
2709 | } | |
2710 | ||
2711 | /* | |
2712 | * Check a full RAID array for plausibility | |
2713 | */ | |
2714 | ||
2715 | ||
a757e64c | 2716 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2717 | { |
2718 | int i; | |
159ec1fc | 2719 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2720 | char b[BDEVNAME_SIZE]; |
2721 | ||
2722 | freshest = NULL; | |
d089c6af | 2723 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2724 | switch (super_types[mddev->major_version]. |
2725 | load_super(rdev, freshest, mddev->minor_version)) { | |
2726 | case 1: | |
2727 | freshest = rdev; | |
2728 | break; | |
2729 | case 0: | |
2730 | break; | |
2731 | default: | |
2732 | printk( KERN_ERR \ | |
2733 | "md: fatal superblock inconsistency in %s" | |
2734 | " -- removing from array\n", | |
2735 | bdevname(rdev->bdev,b)); | |
2736 | kick_rdev_from_array(rdev); | |
2737 | } | |
2738 | ||
2739 | ||
2740 | super_types[mddev->major_version]. | |
2741 | validate_super(mddev, freshest); | |
2742 | ||
2743 | i = 0; | |
d089c6af | 2744 | rdev_for_each(rdev, tmp, mddev) { |
de01dfad N |
2745 | if (rdev->desc_nr >= mddev->max_disks || |
2746 | i > mddev->max_disks) { | |
2747 | printk(KERN_WARNING | |
2748 | "md: %s: %s: only %d devices permitted\n", | |
2749 | mdname(mddev), bdevname(rdev->bdev, b), | |
2750 | mddev->max_disks); | |
2751 | kick_rdev_from_array(rdev); | |
2752 | continue; | |
2753 | } | |
1da177e4 LT |
2754 | if (rdev != freshest) |
2755 | if (super_types[mddev->major_version]. | |
2756 | validate_super(mddev, rdev)) { | |
2757 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2758 | " from array!\n", | |
2759 | bdevname(rdev->bdev,b)); | |
2760 | kick_rdev_from_array(rdev); | |
2761 | continue; | |
2762 | } | |
2763 | if (mddev->level == LEVEL_MULTIPATH) { | |
2764 | rdev->desc_nr = i++; | |
2765 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2766 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 2767 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
2768 | rdev->raid_disk = -1; |
2769 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2770 | } |
2771 | } | |
1da177e4 LT |
2772 | } |
2773 | ||
72e02075 N |
2774 | /* Read a fixed-point number. |
2775 | * Numbers in sysfs attributes should be in "standard" units where | |
2776 | * possible, so time should be in seconds. | |
2777 | * However we internally use a a much smaller unit such as | |
2778 | * milliseconds or jiffies. | |
2779 | * This function takes a decimal number with a possible fractional | |
2780 | * component, and produces an integer which is the result of | |
2781 | * multiplying that number by 10^'scale'. | |
2782 | * all without any floating-point arithmetic. | |
2783 | */ | |
2784 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
2785 | { | |
2786 | unsigned long result = 0; | |
2787 | long decimals = -1; | |
2788 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
2789 | if (*cp == '.') | |
2790 | decimals = 0; | |
2791 | else if (decimals < scale) { | |
2792 | unsigned int value; | |
2793 | value = *cp - '0'; | |
2794 | result = result * 10 + value; | |
2795 | if (decimals >= 0) | |
2796 | decimals++; | |
2797 | } | |
2798 | cp++; | |
2799 | } | |
2800 | if (*cp == '\n') | |
2801 | cp++; | |
2802 | if (*cp) | |
2803 | return -EINVAL; | |
2804 | if (decimals < 0) | |
2805 | decimals = 0; | |
2806 | while (decimals < scale) { | |
2807 | result *= 10; | |
2808 | decimals ++; | |
2809 | } | |
2810 | *res = result; | |
2811 | return 0; | |
2812 | } | |
2813 | ||
2814 | ||
19052c0e N |
2815 | static void md_safemode_timeout(unsigned long data); |
2816 | ||
16f17b39 N |
2817 | static ssize_t |
2818 | safe_delay_show(mddev_t *mddev, char *page) | |
2819 | { | |
2820 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2821 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2822 | } | |
2823 | static ssize_t | |
2824 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2825 | { | |
16f17b39 | 2826 | unsigned long msec; |
97ce0a7f | 2827 | |
72e02075 | 2828 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 2829 | return -EINVAL; |
16f17b39 N |
2830 | if (msec == 0) |
2831 | mddev->safemode_delay = 0; | |
2832 | else { | |
19052c0e | 2833 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2834 | mddev->safemode_delay = (msec*HZ)/1000; |
2835 | if (mddev->safemode_delay == 0) | |
2836 | mddev->safemode_delay = 1; | |
19052c0e N |
2837 | if (mddev->safemode_delay < old_delay) |
2838 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2839 | } |
2840 | return len; | |
2841 | } | |
2842 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2843 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2844 | |
eae1701f | 2845 | static ssize_t |
96de1e66 | 2846 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2847 | { |
2604b703 | 2848 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2849 | if (p) |
eae1701f | 2850 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2851 | else if (mddev->clevel[0]) |
2852 | return sprintf(page, "%s\n", mddev->clevel); | |
2853 | else if (mddev->level != LEVEL_NONE) | |
2854 | return sprintf(page, "%d\n", mddev->level); | |
2855 | else | |
2856 | return 0; | |
eae1701f N |
2857 | } |
2858 | ||
d9d166c2 N |
2859 | static ssize_t |
2860 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2861 | { | |
245f46c2 | 2862 | char level[16]; |
20a49ff6 | 2863 | ssize_t rv = len; |
245f46c2 N |
2864 | struct mdk_personality *pers; |
2865 | void *priv; | |
3a981b03 | 2866 | mdk_rdev_t *rdev; |
245f46c2 N |
2867 | |
2868 | if (mddev->pers == NULL) { | |
2869 | if (len == 0) | |
2870 | return 0; | |
2871 | if (len >= sizeof(mddev->clevel)) | |
2872 | return -ENOSPC; | |
2873 | strncpy(mddev->clevel, buf, len); | |
2874 | if (mddev->clevel[len-1] == '\n') | |
2875 | len--; | |
2876 | mddev->clevel[len] = 0; | |
2877 | mddev->level = LEVEL_NONE; | |
2878 | return rv; | |
2879 | } | |
2880 | ||
2881 | /* request to change the personality. Need to ensure: | |
2882 | * - array is not engaged in resync/recovery/reshape | |
2883 | * - old personality can be suspended | |
2884 | * - new personality will access other array. | |
2885 | */ | |
2886 | ||
2887 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) | |
d9d166c2 | 2888 | return -EBUSY; |
245f46c2 N |
2889 | |
2890 | if (!mddev->pers->quiesce) { | |
2891 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
2892 | mdname(mddev), mddev->pers->name); | |
2893 | return -EINVAL; | |
2894 | } | |
2895 | ||
2896 | /* Now find the new personality */ | |
2897 | if (len == 0 || len >= sizeof(level)) | |
2898 | return -EINVAL; | |
2899 | strncpy(level, buf, len); | |
2900 | if (level[len-1] == '\n') | |
d9d166c2 | 2901 | len--; |
245f46c2 N |
2902 | level[len] = 0; |
2903 | ||
2904 | request_module("md-%s", level); | |
2905 | spin_lock(&pers_lock); | |
2906 | pers = find_pers(LEVEL_NONE, level); | |
2907 | if (!pers || !try_module_get(pers->owner)) { | |
2908 | spin_unlock(&pers_lock); | |
2909 | printk(KERN_WARNING "md: personality %s not loaded\n", level); | |
2910 | return -EINVAL; | |
2911 | } | |
2912 | spin_unlock(&pers_lock); | |
2913 | ||
2914 | if (pers == mddev->pers) { | |
2915 | /* Nothing to do! */ | |
2916 | module_put(pers->owner); | |
2917 | return rv; | |
2918 | } | |
2919 | if (!pers->takeover) { | |
2920 | module_put(pers->owner); | |
2921 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
2922 | mdname(mddev), level); | |
2923 | return -EINVAL; | |
2924 | } | |
2925 | ||
2926 | /* ->takeover must set new_* and/or delta_disks | |
2927 | * if it succeeds, and may set them when it fails. | |
2928 | */ | |
2929 | priv = pers->takeover(mddev); | |
2930 | if (IS_ERR(priv)) { | |
2931 | mddev->new_level = mddev->level; | |
2932 | mddev->new_layout = mddev->layout; | |
664e7c41 | 2933 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
2934 | mddev->raid_disks -= mddev->delta_disks; |
2935 | mddev->delta_disks = 0; | |
2936 | module_put(pers->owner); | |
2937 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
2938 | mdname(mddev), level); | |
2939 | return PTR_ERR(priv); | |
2940 | } | |
2941 | ||
2942 | /* Looks like we have a winner */ | |
2943 | mddev_suspend(mddev); | |
2944 | mddev->pers->stop(mddev); | |
2945 | module_put(mddev->pers->owner); | |
3a981b03 N |
2946 | /* Invalidate devices that are now superfluous */ |
2947 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
2948 | if (rdev->raid_disk >= mddev->raid_disks) { | |
2949 | rdev->raid_disk = -1; | |
2950 | clear_bit(In_sync, &rdev->flags); | |
2951 | } | |
245f46c2 N |
2952 | mddev->pers = pers; |
2953 | mddev->private = priv; | |
2954 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
2955 | mddev->level = mddev->new_level; | |
2956 | mddev->layout = mddev->new_layout; | |
664e7c41 | 2957 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 N |
2958 | mddev->delta_disks = 0; |
2959 | pers->run(mddev); | |
2960 | mddev_resume(mddev); | |
2961 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2962 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2963 | md_wakeup_thread(mddev->thread); | |
d9d166c2 N |
2964 | return rv; |
2965 | } | |
2966 | ||
2967 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2968 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2969 | |
d4dbd025 N |
2970 | |
2971 | static ssize_t | |
2972 | layout_show(mddev_t *mddev, char *page) | |
2973 | { | |
2974 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2975 | if (mddev->reshape_position != MaxSector && |
2976 | mddev->layout != mddev->new_layout) | |
2977 | return sprintf(page, "%d (%d)\n", | |
2978 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2979 | return sprintf(page, "%d\n", mddev->layout); |
2980 | } | |
2981 | ||
2982 | static ssize_t | |
2983 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2984 | { | |
2985 | char *e; | |
2986 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2987 | |
2988 | if (!*buf || (*e && *e != '\n')) | |
2989 | return -EINVAL; | |
2990 | ||
b3546035 N |
2991 | if (mddev->pers) { |
2992 | int err; | |
50ac168a | 2993 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 2994 | return -EBUSY; |
597a711b | 2995 | mddev->new_layout = n; |
50ac168a | 2996 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
2997 | if (err) { |
2998 | mddev->new_layout = mddev->layout; | |
b3546035 | 2999 | return err; |
597a711b | 3000 | } |
b3546035 | 3001 | } else { |
08a02ecd | 3002 | mddev->new_layout = n; |
b3546035 N |
3003 | if (mddev->reshape_position == MaxSector) |
3004 | mddev->layout = n; | |
3005 | } | |
d4dbd025 N |
3006 | return len; |
3007 | } | |
3008 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3009 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3010 | |
3011 | ||
eae1701f | 3012 | static ssize_t |
96de1e66 | 3013 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3014 | { |
bb636547 N |
3015 | if (mddev->raid_disks == 0) |
3016 | return 0; | |
08a02ecd N |
3017 | if (mddev->reshape_position != MaxSector && |
3018 | mddev->delta_disks != 0) | |
3019 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3020 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3021 | return sprintf(page, "%d\n", mddev->raid_disks); |
3022 | } | |
3023 | ||
da943b99 N |
3024 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3025 | ||
3026 | static ssize_t | |
3027 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3028 | { | |
da943b99 N |
3029 | char *e; |
3030 | int rv = 0; | |
3031 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3032 | ||
3033 | if (!*buf || (*e && *e != '\n')) | |
3034 | return -EINVAL; | |
3035 | ||
3036 | if (mddev->pers) | |
3037 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3038 | else if (mddev->reshape_position != MaxSector) { |
3039 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3040 | mddev->delta_disks = n - olddisks; | |
3041 | mddev->raid_disks = n; | |
3042 | } else | |
da943b99 N |
3043 | mddev->raid_disks = n; |
3044 | return rv ? rv : len; | |
3045 | } | |
3046 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3047 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3048 | |
3b34380a N |
3049 | static ssize_t |
3050 | chunk_size_show(mddev_t *mddev, char *page) | |
3051 | { | |
08a02ecd | 3052 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3053 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3054 | return sprintf(page, "%d (%d)\n", | |
3055 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3056 | mddev->chunk_sectors << 9); |
3057 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3058 | } |
3059 | ||
3060 | static ssize_t | |
3061 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3062 | { | |
3b34380a N |
3063 | char *e; |
3064 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3065 | ||
3b34380a N |
3066 | if (!*buf || (*e && *e != '\n')) |
3067 | return -EINVAL; | |
3068 | ||
b3546035 N |
3069 | if (mddev->pers) { |
3070 | int err; | |
50ac168a | 3071 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3072 | return -EBUSY; |
597a711b | 3073 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3074 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3075 | if (err) { |
3076 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3077 | return err; |
597a711b | 3078 | } |
b3546035 | 3079 | } else { |
664e7c41 | 3080 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3081 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3082 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3083 | } |
3b34380a N |
3084 | return len; |
3085 | } | |
3086 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3087 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3088 | |
a94213b1 N |
3089 | static ssize_t |
3090 | resync_start_show(mddev_t *mddev, char *page) | |
3091 | { | |
d1a7c503 N |
3092 | if (mddev->recovery_cp == MaxSector) |
3093 | return sprintf(page, "none\n"); | |
a94213b1 N |
3094 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3095 | } | |
3096 | ||
3097 | static ssize_t | |
3098 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3099 | { | |
a94213b1 N |
3100 | char *e; |
3101 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3102 | ||
3103 | if (mddev->pers) | |
3104 | return -EBUSY; | |
3105 | if (!*buf || (*e && *e != '\n')) | |
3106 | return -EINVAL; | |
3107 | ||
3108 | mddev->recovery_cp = n; | |
3109 | return len; | |
3110 | } | |
3111 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3112 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3113 | |
9e653b63 N |
3114 | /* |
3115 | * The array state can be: | |
3116 | * | |
3117 | * clear | |
3118 | * No devices, no size, no level | |
3119 | * Equivalent to STOP_ARRAY ioctl | |
3120 | * inactive | |
3121 | * May have some settings, but array is not active | |
3122 | * all IO results in error | |
3123 | * When written, doesn't tear down array, but just stops it | |
3124 | * suspended (not supported yet) | |
3125 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3126 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3127 | * readonly |
3128 | * no resync can happen. no superblocks get written. | |
3129 | * write requests fail | |
3130 | * read-auto | |
3131 | * like readonly, but behaves like 'clean' on a write request. | |
3132 | * | |
3133 | * clean - no pending writes, but otherwise active. | |
3134 | * When written to inactive array, starts without resync | |
3135 | * If a write request arrives then | |
3136 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3137 | * if not known, block and switch to write-pending | |
3138 | * If written to an active array that has pending writes, then fails. | |
3139 | * active | |
3140 | * fully active: IO and resync can be happening. | |
3141 | * When written to inactive array, starts with resync | |
3142 | * | |
3143 | * write-pending | |
3144 | * clean, but writes are blocked waiting for 'active' to be written. | |
3145 | * | |
3146 | * active-idle | |
3147 | * like active, but no writes have been seen for a while (100msec). | |
3148 | * | |
3149 | */ | |
3150 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3151 | write_pending, active_idle, bad_word}; | |
05381954 | 3152 | static char *array_states[] = { |
9e653b63 N |
3153 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3154 | "write-pending", "active-idle", NULL }; | |
3155 | ||
3156 | static int match_word(const char *word, char **list) | |
3157 | { | |
3158 | int n; | |
3159 | for (n=0; list[n]; n++) | |
3160 | if (cmd_match(word, list[n])) | |
3161 | break; | |
3162 | return n; | |
3163 | } | |
3164 | ||
3165 | static ssize_t | |
3166 | array_state_show(mddev_t *mddev, char *page) | |
3167 | { | |
3168 | enum array_state st = inactive; | |
3169 | ||
3170 | if (mddev->pers) | |
3171 | switch(mddev->ro) { | |
3172 | case 1: | |
3173 | st = readonly; | |
3174 | break; | |
3175 | case 2: | |
3176 | st = read_auto; | |
3177 | break; | |
3178 | case 0: | |
3179 | if (mddev->in_sync) | |
3180 | st = clean; | |
e691063a N |
3181 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
3182 | st = write_pending; | |
9e653b63 N |
3183 | else if (mddev->safemode) |
3184 | st = active_idle; | |
3185 | else | |
3186 | st = active; | |
3187 | } | |
3188 | else { | |
3189 | if (list_empty(&mddev->disks) && | |
3190 | mddev->raid_disks == 0 && | |
58c0fed4 | 3191 | mddev->dev_sectors == 0) |
9e653b63 N |
3192 | st = clear; |
3193 | else | |
3194 | st = inactive; | |
3195 | } | |
3196 | return sprintf(page, "%s\n", array_states[st]); | |
3197 | } | |
3198 | ||
df5b20cf | 3199 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
3200 | static int do_md_run(mddev_t * mddev); |
3201 | static int restart_array(mddev_t *mddev); | |
3202 | ||
3203 | static ssize_t | |
3204 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3205 | { | |
3206 | int err = -EINVAL; | |
3207 | enum array_state st = match_word(buf, array_states); | |
3208 | switch(st) { | |
3209 | case bad_word: | |
3210 | break; | |
3211 | case clear: | |
3212 | /* stopping an active array */ | |
f2ea68cf | 3213 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3214 | return -EBUSY; |
df5b20cf | 3215 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3216 | break; |
3217 | case inactive: | |
3218 | /* stopping an active array */ | |
3219 | if (mddev->pers) { | |
f2ea68cf | 3220 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3221 | return -EBUSY; |
df5b20cf | 3222 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3223 | } else |
3224 | err = 0; /* already inactive */ | |
9e653b63 N |
3225 | break; |
3226 | case suspended: | |
3227 | break; /* not supported yet */ | |
3228 | case readonly: | |
3229 | if (mddev->pers) | |
df5b20cf | 3230 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
3231 | else { |
3232 | mddev->ro = 1; | |
648b629e | 3233 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3234 | err = do_md_run(mddev); |
3235 | } | |
3236 | break; | |
3237 | case read_auto: | |
9e653b63 | 3238 | if (mddev->pers) { |
80268ee9 | 3239 | if (mddev->ro == 0) |
df5b20cf | 3240 | err = do_md_stop(mddev, 1, 0); |
80268ee9 | 3241 | else if (mddev->ro == 1) |
648b629e N |
3242 | err = restart_array(mddev); |
3243 | if (err == 0) { | |
3244 | mddev->ro = 2; | |
3245 | set_disk_ro(mddev->gendisk, 0); | |
3246 | } | |
9e653b63 N |
3247 | } else { |
3248 | mddev->ro = 2; | |
3249 | err = do_md_run(mddev); | |
3250 | } | |
3251 | break; | |
3252 | case clean: | |
3253 | if (mddev->pers) { | |
3254 | restart_array(mddev); | |
3255 | spin_lock_irq(&mddev->write_lock); | |
3256 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3257 | if (mddev->in_sync == 0) { |
3258 | mddev->in_sync = 1; | |
31a59e34 N |
3259 | if (mddev->safemode == 1) |
3260 | mddev->safemode = 0; | |
e691063a N |
3261 | if (mddev->persistent) |
3262 | set_bit(MD_CHANGE_CLEAN, | |
3263 | &mddev->flags); | |
3264 | } | |
3265 | err = 0; | |
3266 | } else | |
3267 | err = -EBUSY; | |
9e653b63 | 3268 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3269 | } else |
3270 | err = -EINVAL; | |
9e653b63 N |
3271 | break; |
3272 | case active: | |
3273 | if (mddev->pers) { | |
3274 | restart_array(mddev); | |
e691063a N |
3275 | if (mddev->external) |
3276 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
3277 | wake_up(&mddev->sb_wait); |
3278 | err = 0; | |
3279 | } else { | |
3280 | mddev->ro = 0; | |
648b629e | 3281 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3282 | err = do_md_run(mddev); |
3283 | } | |
3284 | break; | |
3285 | case write_pending: | |
3286 | case active_idle: | |
3287 | /* these cannot be set */ | |
3288 | break; | |
3289 | } | |
3290 | if (err) | |
3291 | return err; | |
0fd62b86 | 3292 | else { |
b62b7590 | 3293 | sysfs_notify_dirent(mddev->sysfs_state); |
9e653b63 | 3294 | return len; |
0fd62b86 | 3295 | } |
9e653b63 | 3296 | } |
80ca3a44 N |
3297 | static struct md_sysfs_entry md_array_state = |
3298 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3299 | |
1e50915f RB |
3300 | static ssize_t |
3301 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3302 | return sprintf(page, "%d\n", | |
3303 | atomic_read(&mddev->max_corr_read_errors)); | |
3304 | } | |
3305 | ||
3306 | static ssize_t | |
3307 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3308 | { | |
3309 | char *e; | |
3310 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3311 | ||
3312 | if (*buf && (*e == 0 || *e == '\n')) { | |
3313 | atomic_set(&mddev->max_corr_read_errors, n); | |
3314 | return len; | |
3315 | } | |
3316 | return -EINVAL; | |
3317 | } | |
3318 | ||
3319 | static struct md_sysfs_entry max_corr_read_errors = | |
3320 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3321 | max_corrected_read_errors_store); | |
3322 | ||
6d7ff738 N |
3323 | static ssize_t |
3324 | null_show(mddev_t *mddev, char *page) | |
3325 | { | |
3326 | return -EINVAL; | |
3327 | } | |
3328 | ||
3329 | static ssize_t | |
3330 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3331 | { | |
3332 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3333 | /* The new device is added to the array. | |
3334 | * If the array has a persistent superblock, we read the | |
3335 | * superblock to initialise info and check validity. | |
3336 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3337 | * which mainly checks size. | |
3338 | */ | |
3339 | char *e; | |
3340 | int major = simple_strtoul(buf, &e, 10); | |
3341 | int minor; | |
3342 | dev_t dev; | |
3343 | mdk_rdev_t *rdev; | |
3344 | int err; | |
3345 | ||
3346 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3347 | return -EINVAL; | |
3348 | minor = simple_strtoul(e+1, &e, 10); | |
3349 | if (*e && *e != '\n') | |
3350 | return -EINVAL; | |
3351 | dev = MKDEV(major, minor); | |
3352 | if (major != MAJOR(dev) || | |
3353 | minor != MINOR(dev)) | |
3354 | return -EOVERFLOW; | |
3355 | ||
3356 | ||
3357 | if (mddev->persistent) { | |
3358 | rdev = md_import_device(dev, mddev->major_version, | |
3359 | mddev->minor_version); | |
3360 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3361 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3362 | mdk_rdev_t, same_set); | |
3363 | err = super_types[mddev->major_version] | |
3364 | .load_super(rdev, rdev0, mddev->minor_version); | |
3365 | if (err < 0) | |
3366 | goto out; | |
3367 | } | |
c5d79adb N |
3368 | } else if (mddev->external) |
3369 | rdev = md_import_device(dev, -2, -1); | |
3370 | else | |
6d7ff738 N |
3371 | rdev = md_import_device(dev, -1, -1); |
3372 | ||
3373 | if (IS_ERR(rdev)) | |
3374 | return PTR_ERR(rdev); | |
3375 | err = bind_rdev_to_array(rdev, mddev); | |
3376 | out: | |
3377 | if (err) | |
3378 | export_rdev(rdev); | |
3379 | return err ? err : len; | |
3380 | } | |
3381 | ||
3382 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3383 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3384 | |
9b1d1dac PC |
3385 | static ssize_t |
3386 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3387 | { | |
3388 | char *end; | |
3389 | unsigned long chunk, end_chunk; | |
3390 | ||
3391 | if (!mddev->bitmap) | |
3392 | goto out; | |
3393 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3394 | while (*buf) { | |
3395 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3396 | if (buf == end) break; | |
3397 | if (*end == '-') { /* range */ | |
3398 | buf = end + 1; | |
3399 | end_chunk = simple_strtoul(buf, &end, 0); | |
3400 | if (buf == end) break; | |
3401 | } | |
3402 | if (*end && !isspace(*end)) break; | |
3403 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
3404 | buf = end; | |
3405 | while (isspace(*buf)) buf++; | |
3406 | } | |
3407 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3408 | out: | |
3409 | return len; | |
3410 | } | |
3411 | ||
3412 | static struct md_sysfs_entry md_bitmap = | |
3413 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3414 | ||
a35b0d69 N |
3415 | static ssize_t |
3416 | size_show(mddev_t *mddev, char *page) | |
3417 | { | |
58c0fed4 AN |
3418 | return sprintf(page, "%llu\n", |
3419 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3420 | } |
3421 | ||
d71f9f88 | 3422 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3423 | |
3424 | static ssize_t | |
3425 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3426 | { | |
3427 | /* If array is inactive, we can reduce the component size, but | |
3428 | * not increase it (except from 0). | |
3429 | * If array is active, we can try an on-line resize | |
3430 | */ | |
b522adcd DW |
3431 | sector_t sectors; |
3432 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3433 | |
58c0fed4 AN |
3434 | if (err < 0) |
3435 | return err; | |
a35b0d69 | 3436 | if (mddev->pers) { |
58c0fed4 | 3437 | err = update_size(mddev, sectors); |
850b2b42 | 3438 | md_update_sb(mddev, 1); |
a35b0d69 | 3439 | } else { |
58c0fed4 AN |
3440 | if (mddev->dev_sectors == 0 || |
3441 | mddev->dev_sectors > sectors) | |
3442 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3443 | else |
3444 | err = -ENOSPC; | |
3445 | } | |
3446 | return err ? err : len; | |
3447 | } | |
3448 | ||
3449 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3450 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3451 | |
8bb93aac N |
3452 | |
3453 | /* Metdata version. | |
e691063a N |
3454 | * This is one of |
3455 | * 'none' for arrays with no metadata (good luck...) | |
3456 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3457 | * or N.M for internally known formats |
3458 | */ | |
3459 | static ssize_t | |
3460 | metadata_show(mddev_t *mddev, char *page) | |
3461 | { | |
3462 | if (mddev->persistent) | |
3463 | return sprintf(page, "%d.%d\n", | |
3464 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3465 | else if (mddev->external) |
3466 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3467 | else |
3468 | return sprintf(page, "none\n"); | |
3469 | } | |
3470 | ||
3471 | static ssize_t | |
3472 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3473 | { | |
3474 | int major, minor; | |
3475 | char *e; | |
ea43ddd8 N |
3476 | /* Changing the details of 'external' metadata is |
3477 | * always permitted. Otherwise there must be | |
3478 | * no devices attached to the array. | |
3479 | */ | |
3480 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3481 | ; | |
3482 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3483 | return -EBUSY; |
3484 | ||
3485 | if (cmd_match(buf, "none")) { | |
3486 | mddev->persistent = 0; | |
e691063a N |
3487 | mddev->external = 0; |
3488 | mddev->major_version = 0; | |
3489 | mddev->minor_version = 90; | |
3490 | return len; | |
3491 | } | |
3492 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3493 | size_t namelen = len-9; |
e691063a N |
3494 | if (namelen >= sizeof(mddev->metadata_type)) |
3495 | namelen = sizeof(mddev->metadata_type)-1; | |
3496 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3497 | mddev->metadata_type[namelen] = 0; | |
3498 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3499 | mddev->metadata_type[--namelen] = 0; | |
3500 | mddev->persistent = 0; | |
3501 | mddev->external = 1; | |
8bb93aac N |
3502 | mddev->major_version = 0; |
3503 | mddev->minor_version = 90; | |
3504 | return len; | |
3505 | } | |
3506 | major = simple_strtoul(buf, &e, 10); | |
3507 | if (e==buf || *e != '.') | |
3508 | return -EINVAL; | |
3509 | buf = e+1; | |
3510 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3511 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3512 | return -EINVAL; |
50511da3 | 3513 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3514 | return -ENOENT; |
3515 | mddev->major_version = major; | |
3516 | mddev->minor_version = minor; | |
3517 | mddev->persistent = 1; | |
e691063a | 3518 | mddev->external = 0; |
8bb93aac N |
3519 | return len; |
3520 | } | |
3521 | ||
3522 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3523 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3524 | |
24dd469d | 3525 | static ssize_t |
7eec314d | 3526 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3527 | { |
7eec314d | 3528 | char *type = "idle"; |
b6a9ce68 N |
3529 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3530 | type = "frozen"; | |
3531 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3532 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3533 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3534 | type = "reshape"; | |
3535 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3536 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3537 | type = "resync"; | |
3538 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3539 | type = "check"; | |
3540 | else | |
3541 | type = "repair"; | |
72a23c21 | 3542 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3543 | type = "recover"; |
3544 | } | |
3545 | return sprintf(page, "%s\n", type); | |
3546 | } | |
3547 | ||
3548 | static ssize_t | |
7eec314d | 3549 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3550 | { |
7eec314d N |
3551 | if (!mddev->pers || !mddev->pers->sync_request) |
3552 | return -EINVAL; | |
3553 | ||
b6a9ce68 N |
3554 | if (cmd_match(page, "frozen")) |
3555 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3556 | else | |
3557 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3558 | ||
3559 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
3560 | if (mddev->sync_thread) { |
3561 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3562 | md_unregister_thread(mddev->sync_thread); | |
3563 | mddev->sync_thread = NULL; | |
3564 | mddev->recovery = 0; | |
3565 | } | |
03c902e1 N |
3566 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3567 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3568 | return -EBUSY; |
72a23c21 NB |
3569 | else if (cmd_match(page, "resync")) |
3570 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3571 | else if (cmd_match(page, "recover")) { | |
3572 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3573 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3574 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3575 | int err; |
3576 | if (mddev->pers->start_reshape == NULL) | |
3577 | return -EINVAL; | |
3578 | err = mddev->pers->start_reshape(mddev); | |
3579 | if (err) | |
3580 | return err; | |
a99ac971 | 3581 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3582 | } else { |
bce74dac | 3583 | if (cmd_match(page, "check")) |
7eec314d | 3584 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3585 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3586 | return -EINVAL; |
3587 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3588 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3589 | } |
03c902e1 | 3590 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3591 | md_wakeup_thread(mddev->thread); |
0c3573f1 | 3592 | sysfs_notify_dirent(mddev->sysfs_action); |
24dd469d N |
3593 | return len; |
3594 | } | |
3595 | ||
9d88883e | 3596 | static ssize_t |
96de1e66 | 3597 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3598 | { |
3599 | return sprintf(page, "%llu\n", | |
3600 | (unsigned long long) mddev->resync_mismatches); | |
3601 | } | |
3602 | ||
80ca3a44 N |
3603 | static struct md_sysfs_entry md_scan_mode = |
3604 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3605 | |
96de1e66 | 3606 | |
80ca3a44 | 3607 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3608 | |
88202a0c N |
3609 | static ssize_t |
3610 | sync_min_show(mddev_t *mddev, char *page) | |
3611 | { | |
3612 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3613 | mddev->sync_speed_min ? "local": "system"); | |
3614 | } | |
3615 | ||
3616 | static ssize_t | |
3617 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3618 | { | |
3619 | int min; | |
3620 | char *e; | |
3621 | if (strncmp(buf, "system", 6)==0) { | |
3622 | mddev->sync_speed_min = 0; | |
3623 | return len; | |
3624 | } | |
3625 | min = simple_strtoul(buf, &e, 10); | |
3626 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3627 | return -EINVAL; | |
3628 | mddev->sync_speed_min = min; | |
3629 | return len; | |
3630 | } | |
3631 | ||
3632 | static struct md_sysfs_entry md_sync_min = | |
3633 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3634 | ||
3635 | static ssize_t | |
3636 | sync_max_show(mddev_t *mddev, char *page) | |
3637 | { | |
3638 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3639 | mddev->sync_speed_max ? "local": "system"); | |
3640 | } | |
3641 | ||
3642 | static ssize_t | |
3643 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3644 | { | |
3645 | int max; | |
3646 | char *e; | |
3647 | if (strncmp(buf, "system", 6)==0) { | |
3648 | mddev->sync_speed_max = 0; | |
3649 | return len; | |
3650 | } | |
3651 | max = simple_strtoul(buf, &e, 10); | |
3652 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3653 | return -EINVAL; | |
3654 | mddev->sync_speed_max = max; | |
3655 | return len; | |
3656 | } | |
3657 | ||
3658 | static struct md_sysfs_entry md_sync_max = | |
3659 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3660 | ||
d7f3d291 IP |
3661 | static ssize_t |
3662 | degraded_show(mddev_t *mddev, char *page) | |
3663 | { | |
3664 | return sprintf(page, "%d\n", mddev->degraded); | |
3665 | } | |
3666 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3667 | |
90b08710 BS |
3668 | static ssize_t |
3669 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3670 | { | |
3671 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3672 | } | |
3673 | ||
3674 | static ssize_t | |
3675 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3676 | { | |
3677 | long n; | |
3678 | ||
3679 | if (strict_strtol(buf, 10, &n)) | |
3680 | return -EINVAL; | |
3681 | ||
3682 | if (n != 0 && n != 1) | |
3683 | return -EINVAL; | |
3684 | ||
3685 | mddev->parallel_resync = n; | |
3686 | ||
3687 | if (mddev->sync_thread) | |
3688 | wake_up(&resync_wait); | |
3689 | ||
3690 | return len; | |
3691 | } | |
3692 | ||
3693 | /* force parallel resync, even with shared block devices */ | |
3694 | static struct md_sysfs_entry md_sync_force_parallel = | |
3695 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3696 | sync_force_parallel_show, sync_force_parallel_store); | |
3697 | ||
88202a0c N |
3698 | static ssize_t |
3699 | sync_speed_show(mddev_t *mddev, char *page) | |
3700 | { | |
3701 | unsigned long resync, dt, db; | |
d1a7c503 N |
3702 | if (mddev->curr_resync == 0) |
3703 | return sprintf(page, "none\n"); | |
9687a60c AN |
3704 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3705 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3706 | if (!dt) dt++; |
9687a60c AN |
3707 | db = resync - mddev->resync_mark_cnt; |
3708 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3709 | } |
3710 | ||
80ca3a44 | 3711 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3712 | |
3713 | static ssize_t | |
3714 | sync_completed_show(mddev_t *mddev, char *page) | |
3715 | { | |
58c0fed4 | 3716 | unsigned long max_sectors, resync; |
88202a0c | 3717 | |
acb180b0 N |
3718 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3719 | return sprintf(page, "none\n"); | |
3720 | ||
88202a0c | 3721 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 3722 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3723 | else |
58c0fed4 | 3724 | max_sectors = mddev->dev_sectors; |
88202a0c | 3725 | |
acb180b0 | 3726 | resync = mddev->curr_resync_completed; |
58c0fed4 | 3727 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
88202a0c N |
3728 | } |
3729 | ||
80ca3a44 | 3730 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3731 | |
5e96ee65 NB |
3732 | static ssize_t |
3733 | min_sync_show(mddev_t *mddev, char *page) | |
3734 | { | |
3735 | return sprintf(page, "%llu\n", | |
3736 | (unsigned long long)mddev->resync_min); | |
3737 | } | |
3738 | static ssize_t | |
3739 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3740 | { | |
3741 | unsigned long long min; | |
3742 | if (strict_strtoull(buf, 10, &min)) | |
3743 | return -EINVAL; | |
3744 | if (min > mddev->resync_max) | |
3745 | return -EINVAL; | |
3746 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3747 | return -EBUSY; | |
3748 | ||
3749 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3750 | if (mddev->chunk_sectors) { |
2ac06c33 | 3751 | sector_t temp = min; |
9d8f0363 | 3752 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
3753 | return -EINVAL; |
3754 | } | |
3755 | mddev->resync_min = min; | |
3756 | ||
3757 | return len; | |
3758 | } | |
3759 | ||
3760 | static struct md_sysfs_entry md_min_sync = | |
3761 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3762 | ||
c6207277 N |
3763 | static ssize_t |
3764 | max_sync_show(mddev_t *mddev, char *page) | |
3765 | { | |
3766 | if (mddev->resync_max == MaxSector) | |
3767 | return sprintf(page, "max\n"); | |
3768 | else | |
3769 | return sprintf(page, "%llu\n", | |
3770 | (unsigned long long)mddev->resync_max); | |
3771 | } | |
3772 | static ssize_t | |
3773 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3774 | { | |
3775 | if (strncmp(buf, "max", 3) == 0) | |
3776 | mddev->resync_max = MaxSector; | |
3777 | else { | |
5e96ee65 NB |
3778 | unsigned long long max; |
3779 | if (strict_strtoull(buf, 10, &max)) | |
3780 | return -EINVAL; | |
3781 | if (max < mddev->resync_min) | |
c6207277 N |
3782 | return -EINVAL; |
3783 | if (max < mddev->resync_max && | |
4d484a4a | 3784 | mddev->ro == 0 && |
c6207277 N |
3785 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3786 | return -EBUSY; | |
3787 | ||
3788 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3789 | if (mddev->chunk_sectors) { |
2ac06c33 | 3790 | sector_t temp = max; |
9d8f0363 | 3791 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
3792 | return -EINVAL; |
3793 | } | |
3794 | mddev->resync_max = max; | |
3795 | } | |
3796 | wake_up(&mddev->recovery_wait); | |
3797 | return len; | |
3798 | } | |
3799 | ||
3800 | static struct md_sysfs_entry md_max_sync = | |
3801 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3802 | ||
e464eafd N |
3803 | static ssize_t |
3804 | suspend_lo_show(mddev_t *mddev, char *page) | |
3805 | { | |
3806 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3807 | } | |
3808 | ||
3809 | static ssize_t | |
3810 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3811 | { | |
3812 | char *e; | |
3813 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3814 | ||
b8d966ef N |
3815 | if (mddev->pers == NULL || |
3816 | mddev->pers->quiesce == NULL) | |
e464eafd N |
3817 | return -EINVAL; |
3818 | if (buf == e || (*e && *e != '\n')) | |
3819 | return -EINVAL; | |
3820 | if (new >= mddev->suspend_hi || | |
3821 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3822 | mddev->suspend_lo = new; | |
3823 | mddev->pers->quiesce(mddev, 2); | |
3824 | return len; | |
3825 | } else | |
3826 | return -EINVAL; | |
3827 | } | |
3828 | static struct md_sysfs_entry md_suspend_lo = | |
3829 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3830 | ||
3831 | ||
3832 | static ssize_t | |
3833 | suspend_hi_show(mddev_t *mddev, char *page) | |
3834 | { | |
3835 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3836 | } | |
3837 | ||
3838 | static ssize_t | |
3839 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3840 | { | |
3841 | char *e; | |
3842 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3843 | ||
b8d966ef N |
3844 | if (mddev->pers == NULL || |
3845 | mddev->pers->quiesce == NULL) | |
e464eafd N |
3846 | return -EINVAL; |
3847 | if (buf == e || (*e && *e != '\n')) | |
3848 | return -EINVAL; | |
3849 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3850 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3851 | mddev->suspend_hi = new; | |
3852 | mddev->pers->quiesce(mddev, 1); | |
3853 | mddev->pers->quiesce(mddev, 0); | |
3854 | return len; | |
3855 | } else | |
3856 | return -EINVAL; | |
3857 | } | |
3858 | static struct md_sysfs_entry md_suspend_hi = | |
3859 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3860 | ||
08a02ecd N |
3861 | static ssize_t |
3862 | reshape_position_show(mddev_t *mddev, char *page) | |
3863 | { | |
3864 | if (mddev->reshape_position != MaxSector) | |
3865 | return sprintf(page, "%llu\n", | |
3866 | (unsigned long long)mddev->reshape_position); | |
3867 | strcpy(page, "none\n"); | |
3868 | return 5; | |
3869 | } | |
3870 | ||
3871 | static ssize_t | |
3872 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3873 | { | |
3874 | char *e; | |
3875 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3876 | if (mddev->pers) | |
3877 | return -EBUSY; | |
3878 | if (buf == e || (*e && *e != '\n')) | |
3879 | return -EINVAL; | |
3880 | mddev->reshape_position = new; | |
3881 | mddev->delta_disks = 0; | |
3882 | mddev->new_level = mddev->level; | |
3883 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3884 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
3885 | return len; |
3886 | } | |
3887 | ||
3888 | static struct md_sysfs_entry md_reshape_position = | |
3889 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3890 | reshape_position_store); | |
3891 | ||
b522adcd DW |
3892 | static ssize_t |
3893 | array_size_show(mddev_t *mddev, char *page) | |
3894 | { | |
3895 | if (mddev->external_size) | |
3896 | return sprintf(page, "%llu\n", | |
3897 | (unsigned long long)mddev->array_sectors/2); | |
3898 | else | |
3899 | return sprintf(page, "default\n"); | |
3900 | } | |
3901 | ||
3902 | static ssize_t | |
3903 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3904 | { | |
3905 | sector_t sectors; | |
3906 | ||
3907 | if (strncmp(buf, "default", 7) == 0) { | |
3908 | if (mddev->pers) | |
3909 | sectors = mddev->pers->size(mddev, 0, 0); | |
3910 | else | |
3911 | sectors = mddev->array_sectors; | |
3912 | ||
3913 | mddev->external_size = 0; | |
3914 | } else { | |
3915 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
3916 | return -EINVAL; | |
3917 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 3918 | return -E2BIG; |
b522adcd DW |
3919 | |
3920 | mddev->external_size = 1; | |
3921 | } | |
3922 | ||
3923 | mddev->array_sectors = sectors; | |
3924 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e N |
3925 | if (mddev->pers) |
3926 | revalidate_disk(mddev->gendisk); | |
b522adcd DW |
3927 | |
3928 | return len; | |
3929 | } | |
3930 | ||
3931 | static struct md_sysfs_entry md_array_size = | |
3932 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
3933 | array_size_store); | |
e464eafd | 3934 | |
eae1701f N |
3935 | static struct attribute *md_default_attrs[] = { |
3936 | &md_level.attr, | |
d4dbd025 | 3937 | &md_layout.attr, |
eae1701f | 3938 | &md_raid_disks.attr, |
3b34380a | 3939 | &md_chunk_size.attr, |
a35b0d69 | 3940 | &md_size.attr, |
a94213b1 | 3941 | &md_resync_start.attr, |
8bb93aac | 3942 | &md_metadata.attr, |
6d7ff738 | 3943 | &md_new_device.attr, |
16f17b39 | 3944 | &md_safe_delay.attr, |
9e653b63 | 3945 | &md_array_state.attr, |
08a02ecd | 3946 | &md_reshape_position.attr, |
b522adcd | 3947 | &md_array_size.attr, |
1e50915f | 3948 | &max_corr_read_errors.attr, |
411036fa N |
3949 | NULL, |
3950 | }; | |
3951 | ||
3952 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3953 | &md_scan_mode.attr, |
9d88883e | 3954 | &md_mismatches.attr, |
88202a0c N |
3955 | &md_sync_min.attr, |
3956 | &md_sync_max.attr, | |
3957 | &md_sync_speed.attr, | |
90b08710 | 3958 | &md_sync_force_parallel.attr, |
88202a0c | 3959 | &md_sync_completed.attr, |
5e96ee65 | 3960 | &md_min_sync.attr, |
c6207277 | 3961 | &md_max_sync.attr, |
e464eafd N |
3962 | &md_suspend_lo.attr, |
3963 | &md_suspend_hi.attr, | |
9b1d1dac | 3964 | &md_bitmap.attr, |
d7f3d291 | 3965 | &md_degraded.attr, |
eae1701f N |
3966 | NULL, |
3967 | }; | |
411036fa N |
3968 | static struct attribute_group md_redundancy_group = { |
3969 | .name = NULL, | |
3970 | .attrs = md_redundancy_attrs, | |
3971 | }; | |
3972 | ||
eae1701f N |
3973 | |
3974 | static ssize_t | |
3975 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3976 | { | |
3977 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3978 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3979 | ssize_t rv; |
eae1701f N |
3980 | |
3981 | if (!entry->show) | |
3982 | return -EIO; | |
5dc5cf7d IM |
3983 | rv = mddev_lock(mddev); |
3984 | if (!rv) { | |
3985 | rv = entry->show(mddev, page); | |
3986 | mddev_unlock(mddev); | |
3987 | } | |
96de1e66 | 3988 | return rv; |
eae1701f N |
3989 | } |
3990 | ||
3991 | static ssize_t | |
3992 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3993 | const char *page, size_t length) | |
3994 | { | |
3995 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3996 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3997 | ssize_t rv; |
eae1701f N |
3998 | |
3999 | if (!entry->store) | |
4000 | return -EIO; | |
67463acb N |
4001 | if (!capable(CAP_SYS_ADMIN)) |
4002 | return -EACCES; | |
5dc5cf7d | 4003 | rv = mddev_lock(mddev); |
d3374825 N |
4004 | if (mddev->hold_active == UNTIL_IOCTL) |
4005 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4006 | if (!rv) { |
4007 | rv = entry->store(mddev, page, length); | |
4008 | mddev_unlock(mddev); | |
4009 | } | |
96de1e66 | 4010 | return rv; |
eae1701f N |
4011 | } |
4012 | ||
4013 | static void md_free(struct kobject *ko) | |
4014 | { | |
4015 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4016 | |
4017 | if (mddev->sysfs_state) | |
4018 | sysfs_put(mddev->sysfs_state); | |
4019 | ||
4020 | if (mddev->gendisk) { | |
4021 | del_gendisk(mddev->gendisk); | |
4022 | put_disk(mddev->gendisk); | |
4023 | } | |
4024 | if (mddev->queue) | |
4025 | blk_cleanup_queue(mddev->queue); | |
4026 | ||
eae1701f N |
4027 | kfree(mddev); |
4028 | } | |
4029 | ||
4030 | static struct sysfs_ops md_sysfs_ops = { | |
4031 | .show = md_attr_show, | |
4032 | .store = md_attr_store, | |
4033 | }; | |
4034 | static struct kobj_type md_ktype = { | |
4035 | .release = md_free, | |
4036 | .sysfs_ops = &md_sysfs_ops, | |
4037 | .default_attrs = md_default_attrs, | |
4038 | }; | |
4039 | ||
1da177e4 LT |
4040 | int mdp_major = 0; |
4041 | ||
5fd3a17e DW |
4042 | static void mddev_delayed_delete(struct work_struct *ws) |
4043 | { | |
4044 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4045 | ||
4046 | if (mddev->private == &md_redundancy_group) { | |
4047 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
4048 | if (mddev->sysfs_action) | |
4049 | sysfs_put(mddev->sysfs_action); | |
4050 | mddev->sysfs_action = NULL; | |
4051 | mddev->private = NULL; | |
4052 | } | |
43a70507 | 4053 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4054 | kobject_del(&mddev->kobj); |
4055 | kobject_put(&mddev->kobj); | |
4056 | } | |
4057 | ||
efeb53c0 | 4058 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4059 | { |
48c9c27b | 4060 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4061 | mddev_t *mddev = mddev_find(dev); |
4062 | struct gendisk *disk; | |
efeb53c0 N |
4063 | int partitioned; |
4064 | int shift; | |
4065 | int unit; | |
3830c62f | 4066 | int error; |
1da177e4 LT |
4067 | |
4068 | if (!mddev) | |
efeb53c0 N |
4069 | return -ENODEV; |
4070 | ||
4071 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4072 | shift = partitioned ? MdpMinorShift : 0; | |
4073 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4074 | |
d3374825 N |
4075 | /* wait for any previous instance if this device |
4076 | * to be completed removed (mddev_delayed_delete). | |
4077 | */ | |
4078 | flush_scheduled_work(); | |
4079 | ||
48c9c27b | 4080 | mutex_lock(&disks_mutex); |
0909dc44 N |
4081 | error = -EEXIST; |
4082 | if (mddev->gendisk) | |
4083 | goto abort; | |
efeb53c0 N |
4084 | |
4085 | if (name) { | |
4086 | /* Need to ensure that 'name' is not a duplicate. | |
4087 | */ | |
4088 | mddev_t *mddev2; | |
4089 | spin_lock(&all_mddevs_lock); | |
4090 | ||
4091 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4092 | if (mddev2->gendisk && | |
4093 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4094 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4095 | goto abort; |
efeb53c0 N |
4096 | } |
4097 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4098 | } |
8b765398 | 4099 | |
0909dc44 | 4100 | error = -ENOMEM; |
8b765398 | 4101 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4102 | if (!mddev->queue) |
4103 | goto abort; | |
409c57f3 N |
4104 | mddev->queue->queuedata = mddev; |
4105 | ||
8b765398 N |
4106 | /* Can be unlocked because the queue is new: no concurrency */ |
4107 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
4108 | ||
409c57f3 | 4109 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4110 | |
1da177e4 LT |
4111 | disk = alloc_disk(1 << shift); |
4112 | if (!disk) { | |
8b765398 N |
4113 | blk_cleanup_queue(mddev->queue); |
4114 | mddev->queue = NULL; | |
0909dc44 | 4115 | goto abort; |
1da177e4 | 4116 | } |
efeb53c0 | 4117 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4118 | disk->first_minor = unit << shift; |
efeb53c0 N |
4119 | if (name) |
4120 | strcpy(disk->disk_name, name); | |
4121 | else if (partitioned) | |
1da177e4 | 4122 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4123 | else |
1da177e4 | 4124 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4125 | disk->fops = &md_fops; |
4126 | disk->private_data = mddev; | |
4127 | disk->queue = mddev->queue; | |
92850bbd | 4128 | /* Allow extended partitions. This makes the |
d3374825 | 4129 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4130 | * remove it now. |
4131 | */ | |
4132 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
4133 | add_disk(disk); |
4134 | mddev->gendisk = disk; | |
ed9e1982 TH |
4135 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4136 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4137 | if (error) { |
4138 | /* This isn't possible, but as kobject_init_and_add is marked | |
4139 | * __must_check, we must do something with the result | |
4140 | */ | |
5e55e2f5 N |
4141 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4142 | disk->disk_name); | |
0909dc44 N |
4143 | error = 0; |
4144 | } | |
43a70507 N |
4145 | if (sysfs_create_group(&mddev->kobj, &md_bitmap_group)) |
4146 | printk(KERN_DEBUG "pointless warning\n"); | |
0909dc44 N |
4147 | abort: |
4148 | mutex_unlock(&disks_mutex); | |
4149 | if (!error) { | |
3830c62f | 4150 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
b62b7590 N |
4151 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); |
4152 | } | |
d3374825 | 4153 | mddev_put(mddev); |
0909dc44 | 4154 | return error; |
efeb53c0 N |
4155 | } |
4156 | ||
4157 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4158 | { | |
4159 | md_alloc(dev, NULL); | |
1da177e4 LT |
4160 | return NULL; |
4161 | } | |
4162 | ||
efeb53c0 N |
4163 | static int add_named_array(const char *val, struct kernel_param *kp) |
4164 | { | |
4165 | /* val must be "md_*" where * is not all digits. | |
4166 | * We allocate an array with a large free minor number, and | |
4167 | * set the name to val. val must not already be an active name. | |
4168 | */ | |
4169 | int len = strlen(val); | |
4170 | char buf[DISK_NAME_LEN]; | |
4171 | ||
4172 | while (len && val[len-1] == '\n') | |
4173 | len--; | |
4174 | if (len >= DISK_NAME_LEN) | |
4175 | return -E2BIG; | |
4176 | strlcpy(buf, val, len+1); | |
4177 | if (strncmp(buf, "md_", 3) != 0) | |
4178 | return -EINVAL; | |
4179 | return md_alloc(0, buf); | |
4180 | } | |
4181 | ||
1da177e4 LT |
4182 | static void md_safemode_timeout(unsigned long data) |
4183 | { | |
4184 | mddev_t *mddev = (mddev_t *) data; | |
4185 | ||
0fd62b86 NB |
4186 | if (!atomic_read(&mddev->writes_pending)) { |
4187 | mddev->safemode = 1; | |
4188 | if (mddev->external) | |
b62b7590 | 4189 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 | 4190 | } |
1da177e4 LT |
4191 | md_wakeup_thread(mddev->thread); |
4192 | } | |
4193 | ||
6ff8d8ec | 4194 | static int start_dirty_degraded; |
1da177e4 LT |
4195 | |
4196 | static int do_md_run(mddev_t * mddev) | |
4197 | { | |
2604b703 | 4198 | int err; |
1da177e4 LT |
4199 | mdk_rdev_t *rdev; |
4200 | struct gendisk *disk; | |
2604b703 | 4201 | struct mdk_personality *pers; |
1da177e4 | 4202 | |
a757e64c N |
4203 | if (list_empty(&mddev->disks)) |
4204 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4205 | return -EINVAL; |
1da177e4 LT |
4206 | |
4207 | if (mddev->pers) | |
4208 | return -EBUSY; | |
4209 | ||
4210 | /* | |
4211 | * Analyze all RAID superblock(s) | |
4212 | */ | |
1ec4a939 N |
4213 | if (!mddev->raid_disks) { |
4214 | if (!mddev->persistent) | |
4215 | return -EINVAL; | |
a757e64c | 4216 | analyze_sbs(mddev); |
1ec4a939 | 4217 | } |
1da177e4 | 4218 | |
d9d166c2 N |
4219 | if (mddev->level != LEVEL_NONE) |
4220 | request_module("md-level-%d", mddev->level); | |
4221 | else if (mddev->clevel[0]) | |
4222 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4223 | |
4224 | /* | |
4225 | * Drop all container device buffers, from now on | |
4226 | * the only valid external interface is through the md | |
4227 | * device. | |
1da177e4 | 4228 | */ |
159ec1fc | 4229 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4230 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4231 | continue; |
4232 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4233 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4234 | |
4235 | /* perform some consistency tests on the device. | |
4236 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4237 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4238 | */ |
0f420358 | 4239 | if (rdev->data_offset < rdev->sb_start) { |
58c0fed4 AN |
4240 | if (mddev->dev_sectors && |
4241 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4242 | > rdev->sb_start) { |
f0d76d70 N |
4243 | printk("md: %s: data overlaps metadata\n", |
4244 | mdname(mddev)); | |
4245 | return -EINVAL; | |
4246 | } | |
4247 | } else { | |
0f420358 | 4248 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4249 | > rdev->data_offset) { |
4250 | printk("md: %s: metadata overlaps data\n", | |
4251 | mdname(mddev)); | |
4252 | return -EINVAL; | |
4253 | } | |
4254 | } | |
3c0ee63a | 4255 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
4256 | } |
4257 | ||
4258 | md_probe(mddev->unit, NULL, NULL); | |
4259 | disk = mddev->gendisk; | |
4260 | if (!disk) | |
4261 | return -ENOMEM; | |
4262 | ||
4263 | spin_lock(&pers_lock); | |
d9d166c2 | 4264 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4265 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4266 | spin_unlock(&pers_lock); |
d9d166c2 N |
4267 | if (mddev->level != LEVEL_NONE) |
4268 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4269 | mddev->level); | |
4270 | else | |
4271 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4272 | mddev->clevel); | |
1da177e4 LT |
4273 | return -EINVAL; |
4274 | } | |
2604b703 | 4275 | mddev->pers = pers; |
1da177e4 | 4276 | spin_unlock(&pers_lock); |
34817e8c N |
4277 | if (mddev->level != pers->level) { |
4278 | mddev->level = pers->level; | |
4279 | mddev->new_level = pers->level; | |
4280 | } | |
d9d166c2 | 4281 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4282 | |
f6705578 | 4283 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4284 | pers->start_reshape == NULL) { |
f6705578 N |
4285 | /* This personality cannot handle reshaping... */ |
4286 | mddev->pers = NULL; | |
4287 | module_put(pers->owner); | |
4288 | return -EINVAL; | |
4289 | } | |
4290 | ||
7dd5e7c3 N |
4291 | if (pers->sync_request) { |
4292 | /* Warn if this is a potentially silly | |
4293 | * configuration. | |
4294 | */ | |
4295 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4296 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4297 | int warned = 0; |
159ec1fc CR |
4298 | |
4299 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4300 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4301 | if (rdev < rdev2 && |
4302 | rdev->bdev->bd_contains == | |
4303 | rdev2->bdev->bd_contains) { | |
4304 | printk(KERN_WARNING | |
4305 | "%s: WARNING: %s appears to be" | |
4306 | " on the same physical disk as" | |
4307 | " %s.\n", | |
4308 | mdname(mddev), | |
4309 | bdevname(rdev->bdev,b), | |
4310 | bdevname(rdev2->bdev,b2)); | |
4311 | warned = 1; | |
4312 | } | |
4313 | } | |
159ec1fc | 4314 | |
7dd5e7c3 N |
4315 | if (warned) |
4316 | printk(KERN_WARNING | |
4317 | "True protection against single-disk" | |
4318 | " failure might be compromised.\n"); | |
4319 | } | |
4320 | ||
657390d2 | 4321 | mddev->recovery = 0; |
58c0fed4 AN |
4322 | /* may be over-ridden by personality */ |
4323 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4324 | ||
a9701a30 | 4325 | mddev->barriers_work = 1; |
6ff8d8ec | 4326 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4327 | |
f91de92e N |
4328 | if (start_readonly) |
4329 | mddev->ro = 2; /* read-only, but switch on first write */ | |
4330 | ||
b15c2e57 | 4331 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4332 | if (err) |
4333 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4334 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4335 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4336 | " but 'external_size' not in effect?\n", __func__); | |
4337 | printk(KERN_ERR | |
4338 | "md: invalid array_size %llu > default size %llu\n", | |
4339 | (unsigned long long)mddev->array_sectors / 2, | |
4340 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4341 | err = -EINVAL; | |
4342 | mddev->pers->stop(mddev); | |
4343 | } | |
4344 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4345 | err = bitmap_create(mddev); |
4346 | if (err) { | |
4347 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4348 | mdname(mddev), err); | |
4349 | mddev->pers->stop(mddev); | |
4350 | } | |
4351 | } | |
1da177e4 | 4352 | if (err) { |
1da177e4 LT |
4353 | module_put(mddev->pers->owner); |
4354 | mddev->pers = NULL; | |
32a7627c N |
4355 | bitmap_destroy(mddev); |
4356 | return err; | |
1da177e4 | 4357 | } |
5e55e2f5 N |
4358 | if (mddev->pers->sync_request) { |
4359 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
4360 | printk(KERN_WARNING | |
4361 | "md: cannot register extra attributes for %s\n", | |
4362 | mdname(mddev)); | |
0c3573f1 | 4363 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4364 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4365 | mddev->ro = 0; |
4366 | ||
1da177e4 | 4367 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4368 | atomic_set(&mddev->max_corr_read_errors, |
4369 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4370 | mddev->safemode = 0; |
4371 | mddev->safemode_timer.function = md_safemode_timeout; | |
4372 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4373 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4374 | mddev->in_sync = 1; |
86e6ffdd | 4375 | |
159ec1fc | 4376 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4377 | if (rdev->raid_disk >= 0) { |
4378 | char nm[20]; | |
4379 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
4380 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
4381 | printk("md: cannot register %s for %s\n", | |
4382 | nm, mdname(mddev)); | |
86e6ffdd | 4383 | } |
1da177e4 LT |
4384 | |
4385 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4386 | ||
850b2b42 N |
4387 | if (mddev->flags) |
4388 | md_update_sb(mddev, 0); | |
1da177e4 | 4389 | |
f233ea5c | 4390 | set_capacity(disk, mddev->array_sectors); |
1da177e4 | 4391 | |
5fd6c1dc N |
4392 | /* If there is a partially-recovered drive we need to |
4393 | * start recovery here. If we leave it to md_check_recovery, | |
4394 | * it will remove the drives and not do the right thing | |
4395 | */ | |
0b8c9de0 | 4396 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc | 4397 | int spares = 0; |
159ec1fc | 4398 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
4399 | if (rdev->raid_disk >= 0 && |
4400 | !test_bit(In_sync, &rdev->flags) && | |
4401 | !test_bit(Faulty, &rdev->flags)) | |
4402 | /* complete an interrupted recovery */ | |
4403 | spares++; | |
4404 | if (spares && mddev->pers->sync_request) { | |
4405 | mddev->recovery = 0; | |
4406 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4407 | mddev->sync_thread = md_register_thread(md_do_sync, | |
4408 | mddev, | |
0da3c619 | 4409 | "resync"); |
5fd6c1dc N |
4410 | if (!mddev->sync_thread) { |
4411 | printk(KERN_ERR "%s: could not start resync" | |
4412 | " thread...\n", | |
4413 | mdname(mddev)); | |
4414 | /* leave the spares where they are, it shouldn't hurt */ | |
4415 | mddev->recovery = 0; | |
0b8c9de0 | 4416 | } |
5fd6c1dc N |
4417 | } |
4418 | } | |
0b8c9de0 N |
4419 | md_wakeup_thread(mddev->thread); |
4420 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 4421 | |
449aad3e | 4422 | revalidate_disk(mddev->gendisk); |
44ce6294 | 4423 | mddev->changed = 1; |
d7603b7e | 4424 | md_new_event(mddev); |
b62b7590 | 4425 | sysfs_notify_dirent(mddev->sysfs_state); |
0c3573f1 N |
4426 | if (mddev->sysfs_action) |
4427 | sysfs_notify_dirent(mddev->sysfs_action); | |
a99ac971 | 4428 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
ed9e1982 | 4429 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
1da177e4 LT |
4430 | return 0; |
4431 | } | |
4432 | ||
4433 | static int restart_array(mddev_t *mddev) | |
4434 | { | |
4435 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4436 | |
80fab1d7 | 4437 | /* Complain if it has no devices */ |
1da177e4 | 4438 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4439 | return -ENXIO; |
4440 | if (!mddev->pers) | |
4441 | return -EINVAL; | |
4442 | if (!mddev->ro) | |
4443 | return -EBUSY; | |
4444 | mddev->safemode = 0; | |
4445 | mddev->ro = 0; | |
4446 | set_disk_ro(disk, 0); | |
4447 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4448 | mdname(mddev)); | |
4449 | /* Kick recovery or resync if necessary */ | |
4450 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4451 | md_wakeup_thread(mddev->thread); | |
4452 | md_wakeup_thread(mddev->sync_thread); | |
b62b7590 | 4453 | sysfs_notify_dirent(mddev->sysfs_state); |
80fab1d7 | 4454 | return 0; |
1da177e4 LT |
4455 | } |
4456 | ||
acc55e22 N |
4457 | /* similar to deny_write_access, but accounts for our holding a reference |
4458 | * to the file ourselves */ | |
4459 | static int deny_bitmap_write_access(struct file * file) | |
4460 | { | |
4461 | struct inode *inode = file->f_mapping->host; | |
4462 | ||
4463 | spin_lock(&inode->i_lock); | |
4464 | if (atomic_read(&inode->i_writecount) > 1) { | |
4465 | spin_unlock(&inode->i_lock); | |
4466 | return -ETXTBSY; | |
4467 | } | |
4468 | atomic_set(&inode->i_writecount, -1); | |
4469 | spin_unlock(&inode->i_lock); | |
4470 | ||
4471 | return 0; | |
4472 | } | |
4473 | ||
43a70507 | 4474 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4475 | { |
4476 | struct inode *inode = file->f_mapping->host; | |
4477 | ||
4478 | spin_lock(&inode->i_lock); | |
4479 | atomic_set(&inode->i_writecount, 1); | |
4480 | spin_unlock(&inode->i_lock); | |
4481 | } | |
4482 | ||
9e653b63 N |
4483 | /* mode: |
4484 | * 0 - completely stop and dis-assemble array | |
4485 | * 1 - switch to readonly | |
4486 | * 2 - stop but do not disassemble array | |
4487 | */ | |
df5b20cf | 4488 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
4489 | { |
4490 | int err = 0; | |
4491 | struct gendisk *disk = mddev->gendisk; | |
c4647292 | 4492 | mdk_rdev_t *rdev; |
1da177e4 | 4493 | |
c8c00a69 | 4494 | mutex_lock(&mddev->open_mutex); |
f2ea68cf | 4495 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf | 4496 | printk("md: %s still in use.\n",mdname(mddev)); |
c8c00a69 N |
4497 | err = -EBUSY; |
4498 | } else if (mddev->pers) { | |
1da177e4 LT |
4499 | |
4500 | if (mddev->sync_thread) { | |
5fd6c1dc | 4501 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
4502 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4503 | md_unregister_thread(mddev->sync_thread); | |
4504 | mddev->sync_thread = NULL; | |
4505 | } | |
4506 | ||
4507 | del_timer_sync(&mddev->safemode_timer); | |
4508 | ||
9e653b63 N |
4509 | switch(mode) { |
4510 | case 1: /* readonly */ | |
1da177e4 | 4511 | err = -ENXIO; |
f91de92e | 4512 | if (mddev->ro==1) |
1da177e4 LT |
4513 | goto out; |
4514 | mddev->ro = 1; | |
9e653b63 N |
4515 | break; |
4516 | case 0: /* disassemble */ | |
4517 | case 2: /* stop */ | |
6b8b3e8a | 4518 | bitmap_flush(mddev); |
a9701a30 | 4519 | md_super_wait(mddev); |
1da177e4 LT |
4520 | if (mddev->ro) |
4521 | set_disk_ro(disk, 0); | |
409c57f3 | 4522 | |
1da177e4 | 4523 | mddev->pers->stop(mddev); |
d1b5380c N |
4524 | mddev->queue->merge_bvec_fn = NULL; |
4525 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 4526 | mddev->queue->backing_dev_info.congested_fn = NULL; |
1da177e4 | 4527 | module_put(mddev->pers->owner); |
5fd3a17e DW |
4528 | if (mddev->pers->sync_request) |
4529 | mddev->private = &md_redundancy_group; | |
1da177e4 | 4530 | mddev->pers = NULL; |
4f54b0e9 | 4531 | /* tell userspace to handle 'inactive' */ |
b62b7590 | 4532 | sysfs_notify_dirent(mddev->sysfs_state); |
0d4ca600 | 4533 | |
c4647292 N |
4534 | list_for_each_entry(rdev, &mddev->disks, same_set) |
4535 | if (rdev->raid_disk >= 0) { | |
4536 | char nm[20]; | |
4537 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4538 | sysfs_remove_link(&mddev->kobj, nm); | |
4539 | } | |
4540 | ||
0d4ca600 | 4541 | set_capacity(disk, 0); |
44ce6294 | 4542 | mddev->changed = 1; |
0d4ca600 | 4543 | |
1da177e4 LT |
4544 | if (mddev->ro) |
4545 | mddev->ro = 0; | |
4546 | } | |
850b2b42 | 4547 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
4548 | /* mark array as shutdown cleanly */ |
4549 | mddev->in_sync = 1; | |
850b2b42 | 4550 | md_update_sb(mddev, 1); |
1da177e4 | 4551 | } |
9e653b63 | 4552 | if (mode == 1) |
1da177e4 | 4553 | set_disk_ro(disk, 1); |
5fd6c1dc | 4554 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
80ffb3cc | 4555 | err = 0; |
1da177e4 | 4556 | } |
c8c00a69 N |
4557 | out: |
4558 | mutex_unlock(&mddev->open_mutex); | |
4559 | if (err) | |
4560 | return err; | |
1da177e4 LT |
4561 | /* |
4562 | * Free resources if final stop | |
4563 | */ | |
9e653b63 | 4564 | if (mode == 0) { |
0d4ca600 | 4565 | |
1da177e4 LT |
4566 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4567 | ||
978f946b | 4568 | bitmap_destroy(mddev); |
c3d9714e N |
4569 | if (mddev->bitmap_info.file) { |
4570 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
4571 | fput(mddev->bitmap_info.file); | |
4572 | mddev->bitmap_info.file = NULL; | |
978f946b | 4573 | } |
c3d9714e | 4574 | mddev->bitmap_info.offset = 0; |
978f946b | 4575 | |
177a99b2 | 4576 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
4577 | flush_scheduled_work(); |
4578 | ||
1da177e4 LT |
4579 | export_array(mddev); |
4580 | ||
f233ea5c | 4581 | mddev->array_sectors = 0; |
b522adcd | 4582 | mddev->external_size = 0; |
58c0fed4 | 4583 | mddev->dev_sectors = 0; |
9e653b63 | 4584 | mddev->raid_disks = 0; |
a94213b1 | 4585 | mddev->recovery_cp = 0; |
5e96ee65 | 4586 | mddev->resync_min = 0; |
c6207277 | 4587 | mddev->resync_max = MaxSector; |
08a02ecd | 4588 | mddev->reshape_position = MaxSector; |
e691063a | 4589 | mddev->external = 0; |
1ec4a939 | 4590 | mddev->persistent = 0; |
d897dbf9 N |
4591 | mddev->level = LEVEL_NONE; |
4592 | mddev->clevel[0] = 0; | |
4593 | mddev->flags = 0; | |
4594 | mddev->ro = 0; | |
4595 | mddev->metadata_type[0] = 0; | |
9d8f0363 | 4596 | mddev->chunk_sectors = 0; |
d897dbf9 N |
4597 | mddev->ctime = mddev->utime = 0; |
4598 | mddev->layout = 0; | |
4599 | mddev->max_disks = 0; | |
4600 | mddev->events = 0; | |
4601 | mddev->delta_disks = 0; | |
4602 | mddev->new_level = LEVEL_NONE; | |
4603 | mddev->new_layout = 0; | |
664e7c41 | 4604 | mddev->new_chunk_sectors = 0; |
d897dbf9 N |
4605 | mddev->curr_resync = 0; |
4606 | mddev->resync_mismatches = 0; | |
4607 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4608 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4609 | mddev->recovery = 0; | |
4610 | mddev->in_sync = 0; | |
4611 | mddev->changed = 0; | |
4612 | mddev->degraded = 0; | |
4613 | mddev->barriers_work = 0; | |
4614 | mddev->safemode = 0; | |
c3d9714e N |
4615 | mddev->bitmap_info.offset = 0; |
4616 | mddev->bitmap_info.default_offset = 0; | |
42a04b50 N |
4617 | mddev->bitmap_info.chunksize = 0; |
4618 | mddev->bitmap_info.daemon_sleep = 0; | |
4619 | mddev->bitmap_info.max_write_behind = 0; | |
934d9c23 | 4620 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4621 | if (mddev->hold_active == UNTIL_STOP) |
4622 | mddev->hold_active = 0; | |
9e653b63 | 4623 | |
a8a55c38 | 4624 | } else if (mddev->pers) |
1da177e4 LT |
4625 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
4626 | mdname(mddev)); | |
4627 | err = 0; | |
3f9d99c1 | 4628 | blk_integrity_unregister(disk); |
d7603b7e | 4629 | md_new_event(mddev); |
b62b7590 | 4630 | sysfs_notify_dirent(mddev->sysfs_state); |
1da177e4 LT |
4631 | return err; |
4632 | } | |
4633 | ||
fdee8ae4 | 4634 | #ifndef MODULE |
1da177e4 LT |
4635 | static void autorun_array(mddev_t *mddev) |
4636 | { | |
4637 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4638 | int err; |
4639 | ||
a757e64c | 4640 | if (list_empty(&mddev->disks)) |
1da177e4 | 4641 | return; |
1da177e4 LT |
4642 | |
4643 | printk(KERN_INFO "md: running: "); | |
4644 | ||
159ec1fc | 4645 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4646 | char b[BDEVNAME_SIZE]; |
4647 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4648 | } | |
4649 | printk("\n"); | |
4650 | ||
d710e138 | 4651 | err = do_md_run(mddev); |
1da177e4 LT |
4652 | if (err) { |
4653 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4654 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4655 | } |
4656 | } | |
4657 | ||
4658 | /* | |
4659 | * lets try to run arrays based on all disks that have arrived | |
4660 | * until now. (those are in pending_raid_disks) | |
4661 | * | |
4662 | * the method: pick the first pending disk, collect all disks with | |
4663 | * the same UUID, remove all from the pending list and put them into | |
4664 | * the 'same_array' list. Then order this list based on superblock | |
4665 | * update time (freshest comes first), kick out 'old' disks and | |
4666 | * compare superblocks. If everything's fine then run it. | |
4667 | * | |
4668 | * If "unit" is allocated, then bump its reference count | |
4669 | */ | |
4670 | static void autorun_devices(int part) | |
4671 | { | |
159ec1fc | 4672 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4673 | mddev_t *mddev; |
4674 | char b[BDEVNAME_SIZE]; | |
4675 | ||
4676 | printk(KERN_INFO "md: autorun ...\n"); | |
4677 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4678 | int unit; |
1da177e4 | 4679 | dev_t dev; |
ad01c9e3 | 4680 | LIST_HEAD(candidates); |
1da177e4 LT |
4681 | rdev0 = list_entry(pending_raid_disks.next, |
4682 | mdk_rdev_t, same_set); | |
4683 | ||
4684 | printk(KERN_INFO "md: considering %s ...\n", | |
4685 | bdevname(rdev0->bdev,b)); | |
4686 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4687 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4688 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4689 | printk(KERN_INFO "md: adding %s ...\n", | |
4690 | bdevname(rdev->bdev,b)); | |
4691 | list_move(&rdev->same_set, &candidates); | |
4692 | } | |
4693 | /* | |
4694 | * now we have a set of devices, with all of them having | |
4695 | * mostly sane superblocks. It's time to allocate the | |
4696 | * mddev. | |
4697 | */ | |
e8703fe1 N |
4698 | if (part) { |
4699 | dev = MKDEV(mdp_major, | |
4700 | rdev0->preferred_minor << MdpMinorShift); | |
4701 | unit = MINOR(dev) >> MdpMinorShift; | |
4702 | } else { | |
4703 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4704 | unit = MINOR(dev); | |
4705 | } | |
4706 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4707 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4708 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4709 | break; | |
4710 | } | |
1da177e4 LT |
4711 | |
4712 | md_probe(dev, NULL, NULL); | |
4713 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4714 | if (!mddev || !mddev->gendisk) { |
4715 | if (mddev) | |
4716 | mddev_put(mddev); | |
4717 | printk(KERN_ERR | |
1da177e4 LT |
4718 | "md: cannot allocate memory for md drive.\n"); |
4719 | break; | |
4720 | } | |
4721 | if (mddev_lock(mddev)) | |
4722 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4723 | mdname(mddev)); | |
4724 | else if (mddev->raid_disks || mddev->major_version | |
4725 | || !list_empty(&mddev->disks)) { | |
4726 | printk(KERN_WARNING | |
4727 | "md: %s already running, cannot run %s\n", | |
4728 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4729 | mddev_unlock(mddev); | |
4730 | } else { | |
4731 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4732 | mddev->persistent = 1; |
159ec1fc | 4733 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4734 | list_del_init(&rdev->same_set); |
4735 | if (bind_rdev_to_array(rdev, mddev)) | |
4736 | export_rdev(rdev); | |
4737 | } | |
4738 | autorun_array(mddev); | |
4739 | mddev_unlock(mddev); | |
4740 | } | |
4741 | /* on success, candidates will be empty, on error | |
4742 | * it won't... | |
4743 | */ | |
159ec1fc | 4744 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4745 | list_del_init(&rdev->same_set); |
1da177e4 | 4746 | export_rdev(rdev); |
4b80991c | 4747 | } |
1da177e4 LT |
4748 | mddev_put(mddev); |
4749 | } | |
4750 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4751 | } | |
fdee8ae4 | 4752 | #endif /* !MODULE */ |
1da177e4 | 4753 | |
1da177e4 LT |
4754 | static int get_version(void __user * arg) |
4755 | { | |
4756 | mdu_version_t ver; | |
4757 | ||
4758 | ver.major = MD_MAJOR_VERSION; | |
4759 | ver.minor = MD_MINOR_VERSION; | |
4760 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4761 | ||
4762 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4763 | return -EFAULT; | |
4764 | ||
4765 | return 0; | |
4766 | } | |
4767 | ||
4768 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4769 | { | |
4770 | mdu_array_info_t info; | |
a9f326eb | 4771 | int nr,working,insync,failed,spare; |
1da177e4 | 4772 | mdk_rdev_t *rdev; |
1da177e4 | 4773 | |
a9f326eb | 4774 | nr=working=insync=failed=spare=0; |
159ec1fc | 4775 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4776 | nr++; |
b2d444d7 | 4777 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4778 | failed++; |
4779 | else { | |
4780 | working++; | |
b2d444d7 | 4781 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 4782 | insync++; |
1da177e4 LT |
4783 | else |
4784 | spare++; | |
4785 | } | |
4786 | } | |
4787 | ||
4788 | info.major_version = mddev->major_version; | |
4789 | info.minor_version = mddev->minor_version; | |
4790 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4791 | info.ctime = mddev->ctime; | |
4792 | info.level = mddev->level; | |
58c0fed4 AN |
4793 | info.size = mddev->dev_sectors / 2; |
4794 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 4795 | info.size = -1; |
1da177e4 LT |
4796 | info.nr_disks = nr; |
4797 | info.raid_disks = mddev->raid_disks; | |
4798 | info.md_minor = mddev->md_minor; | |
4799 | info.not_persistent= !mddev->persistent; | |
4800 | ||
4801 | info.utime = mddev->utime; | |
4802 | info.state = 0; | |
4803 | if (mddev->in_sync) | |
4804 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 4805 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 4806 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 4807 | info.active_disks = insync; |
1da177e4 LT |
4808 | info.working_disks = working; |
4809 | info.failed_disks = failed; | |
4810 | info.spare_disks = spare; | |
4811 | ||
4812 | info.layout = mddev->layout; | |
9d8f0363 | 4813 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
4814 | |
4815 | if (copy_to_user(arg, &info, sizeof(info))) | |
4816 | return -EFAULT; | |
4817 | ||
4818 | return 0; | |
4819 | } | |
4820 | ||
87162a28 | 4821 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4822 | { |
4823 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4824 | char *ptr, *buf = NULL; | |
4825 | int err = -ENOMEM; | |
4826 | ||
b5470dc5 DW |
4827 | if (md_allow_write(mddev)) |
4828 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4829 | else | |
4830 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4831 | |
32a7627c N |
4832 | if (!file) |
4833 | goto out; | |
4834 | ||
4835 | /* bitmap disabled, zero the first byte and copy out */ | |
4836 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4837 | file->pathname[0] = '\0'; | |
4838 | goto copy_out; | |
4839 | } | |
4840 | ||
4841 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4842 | if (!buf) | |
4843 | goto out; | |
4844 | ||
6bcfd601 CH |
4845 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4846 | if (IS_ERR(ptr)) | |
32a7627c N |
4847 | goto out; |
4848 | ||
4849 | strcpy(file->pathname, ptr); | |
4850 | ||
4851 | copy_out: | |
4852 | err = 0; | |
4853 | if (copy_to_user(arg, file, sizeof(*file))) | |
4854 | err = -EFAULT; | |
4855 | out: | |
4856 | kfree(buf); | |
4857 | kfree(file); | |
4858 | return err; | |
4859 | } | |
4860 | ||
1da177e4 LT |
4861 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4862 | { | |
4863 | mdu_disk_info_t info; | |
1da177e4 LT |
4864 | mdk_rdev_t *rdev; |
4865 | ||
4866 | if (copy_from_user(&info, arg, sizeof(info))) | |
4867 | return -EFAULT; | |
4868 | ||
26ef379f | 4869 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4870 | if (rdev) { |
4871 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4872 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4873 | info.raid_disk = rdev->raid_disk; | |
4874 | info.state = 0; | |
b2d444d7 | 4875 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4876 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4877 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4878 | info.state |= (1<<MD_DISK_ACTIVE); |
4879 | info.state |= (1<<MD_DISK_SYNC); | |
4880 | } | |
8ddf9efe N |
4881 | if (test_bit(WriteMostly, &rdev->flags)) |
4882 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4883 | } else { |
4884 | info.major = info.minor = 0; | |
4885 | info.raid_disk = -1; | |
4886 | info.state = (1<<MD_DISK_REMOVED); | |
4887 | } | |
4888 | ||
4889 | if (copy_to_user(arg, &info, sizeof(info))) | |
4890 | return -EFAULT; | |
4891 | ||
4892 | return 0; | |
4893 | } | |
4894 | ||
4895 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4896 | { | |
4897 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4898 | mdk_rdev_t *rdev; | |
4899 | dev_t dev = MKDEV(info->major,info->minor); | |
4900 | ||
4901 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4902 | return -EOVERFLOW; | |
4903 | ||
4904 | if (!mddev->raid_disks) { | |
4905 | int err; | |
4906 | /* expecting a device which has a superblock */ | |
4907 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4908 | if (IS_ERR(rdev)) { | |
4909 | printk(KERN_WARNING | |
4910 | "md: md_import_device returned %ld\n", | |
4911 | PTR_ERR(rdev)); | |
4912 | return PTR_ERR(rdev); | |
4913 | } | |
4914 | if (!list_empty(&mddev->disks)) { | |
4915 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4916 | mdk_rdev_t, same_set); | |
a9f326eb | 4917 | err = super_types[mddev->major_version] |
1da177e4 LT |
4918 | .load_super(rdev, rdev0, mddev->minor_version); |
4919 | if (err < 0) { | |
4920 | printk(KERN_WARNING | |
4921 | "md: %s has different UUID to %s\n", | |
4922 | bdevname(rdev->bdev,b), | |
4923 | bdevname(rdev0->bdev,b2)); | |
4924 | export_rdev(rdev); | |
4925 | return -EINVAL; | |
4926 | } | |
4927 | } | |
4928 | err = bind_rdev_to_array(rdev, mddev); | |
4929 | if (err) | |
4930 | export_rdev(rdev); | |
4931 | return err; | |
4932 | } | |
4933 | ||
4934 | /* | |
4935 | * add_new_disk can be used once the array is assembled | |
4936 | * to add "hot spares". They must already have a superblock | |
4937 | * written | |
4938 | */ | |
4939 | if (mddev->pers) { | |
4940 | int err; | |
4941 | if (!mddev->pers->hot_add_disk) { | |
4942 | printk(KERN_WARNING | |
4943 | "%s: personality does not support diskops!\n", | |
4944 | mdname(mddev)); | |
4945 | return -EINVAL; | |
4946 | } | |
7b1e35f6 N |
4947 | if (mddev->persistent) |
4948 | rdev = md_import_device(dev, mddev->major_version, | |
4949 | mddev->minor_version); | |
4950 | else | |
4951 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4952 | if (IS_ERR(rdev)) { |
4953 | printk(KERN_WARNING | |
4954 | "md: md_import_device returned %ld\n", | |
4955 | PTR_ERR(rdev)); | |
4956 | return PTR_ERR(rdev); | |
4957 | } | |
41158c7e N |
4958 | /* set save_raid_disk if appropriate */ |
4959 | if (!mddev->persistent) { | |
4960 | if (info->state & (1<<MD_DISK_SYNC) && | |
4961 | info->raid_disk < mddev->raid_disks) | |
4962 | rdev->raid_disk = info->raid_disk; | |
4963 | else | |
4964 | rdev->raid_disk = -1; | |
4965 | } else | |
4966 | super_types[mddev->major_version]. | |
4967 | validate_super(mddev, rdev); | |
4968 | rdev->saved_raid_disk = rdev->raid_disk; | |
4969 | ||
b2d444d7 | 4970 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4971 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4972 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
4973 | else |
4974 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 4975 | |
1da177e4 LT |
4976 | rdev->raid_disk = -1; |
4977 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4978 | if (!err && !mddev->pers->hot_remove_disk) { |
4979 | /* If there is hot_add_disk but no hot_remove_disk | |
4980 | * then added disks for geometry changes, | |
4981 | * and should be added immediately. | |
4982 | */ | |
4983 | super_types[mddev->major_version]. | |
4984 | validate_super(mddev, rdev); | |
4985 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4986 | if (err) | |
4987 | unbind_rdev_from_array(rdev); | |
4988 | } | |
1da177e4 LT |
4989 | if (err) |
4990 | export_rdev(rdev); | |
52664732 | 4991 | else |
3c0ee63a | 4992 | sysfs_notify_dirent(rdev->sysfs_state); |
c361777f | 4993 | |
17571284 | 4994 | md_update_sb(mddev, 1); |
72a23c21 NB |
4995 | if (mddev->degraded) |
4996 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4997 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4998 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4999 | return err; |
5000 | } | |
5001 | ||
5002 | /* otherwise, add_new_disk is only allowed | |
5003 | * for major_version==0 superblocks | |
5004 | */ | |
5005 | if (mddev->major_version != 0) { | |
5006 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5007 | mdname(mddev)); | |
5008 | return -EINVAL; | |
5009 | } | |
5010 | ||
5011 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5012 | int err; | |
d710e138 | 5013 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5014 | if (IS_ERR(rdev)) { |
5015 | printk(KERN_WARNING | |
5016 | "md: error, md_import_device() returned %ld\n", | |
5017 | PTR_ERR(rdev)); | |
5018 | return PTR_ERR(rdev); | |
5019 | } | |
5020 | rdev->desc_nr = info->number; | |
5021 | if (info->raid_disk < mddev->raid_disks) | |
5022 | rdev->raid_disk = info->raid_disk; | |
5023 | else | |
5024 | rdev->raid_disk = -1; | |
5025 | ||
1da177e4 | 5026 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5027 | if (info->state & (1<<MD_DISK_SYNC)) |
5028 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5029 | |
8ddf9efe N |
5030 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5031 | set_bit(WriteMostly, &rdev->flags); | |
5032 | ||
1da177e4 LT |
5033 | if (!mddev->persistent) { |
5034 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 5035 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 5036 | } else |
0f420358 | 5037 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
8190e754 | 5038 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5039 | |
2bf071bf N |
5040 | err = bind_rdev_to_array(rdev, mddev); |
5041 | if (err) { | |
5042 | export_rdev(rdev); | |
5043 | return err; | |
5044 | } | |
1da177e4 LT |
5045 | } |
5046 | ||
5047 | return 0; | |
5048 | } | |
5049 | ||
5050 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5051 | { | |
5052 | char b[BDEVNAME_SIZE]; | |
5053 | mdk_rdev_t *rdev; | |
5054 | ||
1da177e4 LT |
5055 | rdev = find_rdev(mddev, dev); |
5056 | if (!rdev) | |
5057 | return -ENXIO; | |
5058 | ||
5059 | if (rdev->raid_disk >= 0) | |
5060 | goto busy; | |
5061 | ||
5062 | kick_rdev_from_array(rdev); | |
850b2b42 | 5063 | md_update_sb(mddev, 1); |
d7603b7e | 5064 | md_new_event(mddev); |
1da177e4 LT |
5065 | |
5066 | return 0; | |
5067 | busy: | |
fdefa4d8 | 5068 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5069 | bdevname(rdev->bdev,b), mdname(mddev)); |
5070 | return -EBUSY; | |
5071 | } | |
5072 | ||
5073 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5074 | { | |
5075 | char b[BDEVNAME_SIZE]; | |
5076 | int err; | |
1da177e4 LT |
5077 | mdk_rdev_t *rdev; |
5078 | ||
5079 | if (!mddev->pers) | |
5080 | return -ENODEV; | |
5081 | ||
5082 | if (mddev->major_version != 0) { | |
5083 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5084 | " version-0 superblocks.\n", | |
5085 | mdname(mddev)); | |
5086 | return -EINVAL; | |
5087 | } | |
5088 | if (!mddev->pers->hot_add_disk) { | |
5089 | printk(KERN_WARNING | |
5090 | "%s: personality does not support diskops!\n", | |
5091 | mdname(mddev)); | |
5092 | return -EINVAL; | |
5093 | } | |
5094 | ||
d710e138 | 5095 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5096 | if (IS_ERR(rdev)) { |
5097 | printk(KERN_WARNING | |
5098 | "md: error, md_import_device() returned %ld\n", | |
5099 | PTR_ERR(rdev)); | |
5100 | return -EINVAL; | |
5101 | } | |
5102 | ||
5103 | if (mddev->persistent) | |
0f420358 | 5104 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 5105 | else |
0f420358 | 5106 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 5107 | |
8190e754 | 5108 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5109 | |
b2d444d7 | 5110 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5111 | printk(KERN_WARNING |
5112 | "md: can not hot-add faulty %s disk to %s!\n", | |
5113 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5114 | err = -EINVAL; | |
5115 | goto abort_export; | |
5116 | } | |
b2d444d7 | 5117 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5118 | rdev->desc_nr = -1; |
5842730d | 5119 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5120 | err = bind_rdev_to_array(rdev, mddev); |
5121 | if (err) | |
5122 | goto abort_export; | |
1da177e4 LT |
5123 | |
5124 | /* | |
5125 | * The rest should better be atomic, we can have disk failures | |
5126 | * noticed in interrupt contexts ... | |
5127 | */ | |
5128 | ||
1da177e4 LT |
5129 | rdev->raid_disk = -1; |
5130 | ||
850b2b42 | 5131 | md_update_sb(mddev, 1); |
1da177e4 LT |
5132 | |
5133 | /* | |
5134 | * Kick recovery, maybe this spare has to be added to the | |
5135 | * array immediately. | |
5136 | */ | |
5137 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5138 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5139 | md_new_event(mddev); |
1da177e4 LT |
5140 | return 0; |
5141 | ||
1da177e4 LT |
5142 | abort_export: |
5143 | export_rdev(rdev); | |
5144 | return err; | |
5145 | } | |
5146 | ||
32a7627c N |
5147 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5148 | { | |
5149 | int err; | |
5150 | ||
36fa3063 N |
5151 | if (mddev->pers) { |
5152 | if (!mddev->pers->quiesce) | |
5153 | return -EBUSY; | |
5154 | if (mddev->recovery || mddev->sync_thread) | |
5155 | return -EBUSY; | |
5156 | /* we should be able to change the bitmap.. */ | |
5157 | } | |
32a7627c | 5158 | |
32a7627c | 5159 | |
36fa3063 N |
5160 | if (fd >= 0) { |
5161 | if (mddev->bitmap) | |
5162 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5163 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5164 | |
c3d9714e | 5165 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5166 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5167 | mdname(mddev)); | |
5168 | return -EBADF; | |
5169 | } | |
5170 | ||
c3d9714e | 5171 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5172 | if (err) { |
5173 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5174 | mdname(mddev)); | |
c3d9714e N |
5175 | fput(mddev->bitmap_info.file); |
5176 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5177 | return err; |
5178 | } | |
c3d9714e | 5179 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5180 | } else if (mddev->bitmap == NULL) |
5181 | return -ENOENT; /* cannot remove what isn't there */ | |
5182 | err = 0; | |
5183 | if (mddev->pers) { | |
5184 | mddev->pers->quiesce(mddev, 1); | |
5185 | if (fd >= 0) | |
5186 | err = bitmap_create(mddev); | |
d7375ab3 | 5187 | if (fd < 0 || err) { |
36fa3063 | 5188 | bitmap_destroy(mddev); |
d7375ab3 N |
5189 | fd = -1; /* make sure to put the file */ |
5190 | } | |
36fa3063 | 5191 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5192 | } |
5193 | if (fd < 0) { | |
c3d9714e N |
5194 | if (mddev->bitmap_info.file) { |
5195 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5196 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5197 | } |
c3d9714e | 5198 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5199 | } |
5200 | ||
32a7627c N |
5201 | return err; |
5202 | } | |
5203 | ||
1da177e4 LT |
5204 | /* |
5205 | * set_array_info is used two different ways | |
5206 | * The original usage is when creating a new array. | |
5207 | * In this usage, raid_disks is > 0 and it together with | |
5208 | * level, size, not_persistent,layout,chunksize determine the | |
5209 | * shape of the array. | |
5210 | * This will always create an array with a type-0.90.0 superblock. | |
5211 | * The newer usage is when assembling an array. | |
5212 | * In this case raid_disks will be 0, and the major_version field is | |
5213 | * use to determine which style super-blocks are to be found on the devices. | |
5214 | * The minor and patch _version numbers are also kept incase the | |
5215 | * super_block handler wishes to interpret them. | |
5216 | */ | |
5217 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5218 | { | |
5219 | ||
5220 | if (info->raid_disks == 0) { | |
5221 | /* just setting version number for superblock loading */ | |
5222 | if (info->major_version < 0 || | |
50511da3 | 5223 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5224 | super_types[info->major_version].name == NULL) { |
5225 | /* maybe try to auto-load a module? */ | |
5226 | printk(KERN_INFO | |
5227 | "md: superblock version %d not known\n", | |
5228 | info->major_version); | |
5229 | return -EINVAL; | |
5230 | } | |
5231 | mddev->major_version = info->major_version; | |
5232 | mddev->minor_version = info->minor_version; | |
5233 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5234 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
5235 | return 0; |
5236 | } | |
5237 | mddev->major_version = MD_MAJOR_VERSION; | |
5238 | mddev->minor_version = MD_MINOR_VERSION; | |
5239 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5240 | mddev->ctime = get_seconds(); | |
5241 | ||
5242 | mddev->level = info->level; | |
17115e03 | 5243 | mddev->clevel[0] = 0; |
58c0fed4 | 5244 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5245 | mddev->raid_disks = info->raid_disks; |
5246 | /* don't set md_minor, it is determined by which /dev/md* was | |
5247 | * openned | |
5248 | */ | |
5249 | if (info->state & (1<<MD_SB_CLEAN)) | |
5250 | mddev->recovery_cp = MaxSector; | |
5251 | else | |
5252 | mddev->recovery_cp = 0; | |
5253 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5254 | mddev->external = 0; |
1da177e4 LT |
5255 | |
5256 | mddev->layout = info->layout; | |
9d8f0363 | 5257 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5258 | |
5259 | mddev->max_disks = MD_SB_DISKS; | |
5260 | ||
e691063a N |
5261 | if (mddev->persistent) |
5262 | mddev->flags = 0; | |
850b2b42 | 5263 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5264 | |
c3d9714e N |
5265 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5266 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5267 | |
f6705578 N |
5268 | mddev->reshape_position = MaxSector; |
5269 | ||
1da177e4 LT |
5270 | /* |
5271 | * Generate a 128 bit UUID | |
5272 | */ | |
5273 | get_random_bytes(mddev->uuid, 16); | |
5274 | ||
f6705578 | 5275 | mddev->new_level = mddev->level; |
664e7c41 | 5276 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5277 | mddev->new_layout = mddev->layout; |
5278 | mddev->delta_disks = 0; | |
5279 | ||
1da177e4 LT |
5280 | return 0; |
5281 | } | |
5282 | ||
1f403624 DW |
5283 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5284 | { | |
b522adcd DW |
5285 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5286 | ||
5287 | if (mddev->external_size) | |
5288 | return; | |
5289 | ||
1f403624 DW |
5290 | mddev->array_sectors = array_sectors; |
5291 | } | |
5292 | EXPORT_SYMBOL(md_set_array_sectors); | |
5293 | ||
d71f9f88 | 5294 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5295 | { |
159ec1fc | 5296 | mdk_rdev_t *rdev; |
a35b0d69 | 5297 | int rv; |
d71f9f88 | 5298 | int fit = (num_sectors == 0); |
a35b0d69 N |
5299 | |
5300 | if (mddev->pers->resize == NULL) | |
5301 | return -EINVAL; | |
d71f9f88 AN |
5302 | /* The "num_sectors" is the number of sectors of each device that |
5303 | * is used. This can only make sense for arrays with redundancy. | |
5304 | * linear and raid0 always use whatever space is available. We can only | |
5305 | * consider changing this number if no resync or reconstruction is | |
5306 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5307 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5308 | * of each device. If num_sectors is zero, we find the largest size |
5309 | * that fits. | |
5310 | ||
a35b0d69 N |
5311 | */ |
5312 | if (mddev->sync_thread) | |
5313 | return -EBUSY; | |
dba034ee N |
5314 | if (mddev->bitmap) |
5315 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5316 | * grow, and re-add. | |
5317 | */ | |
5318 | return -EBUSY; | |
159ec1fc | 5319 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5320 | sector_t avail = rdev->sectors; |
01ab5662 | 5321 | |
d71f9f88 AN |
5322 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5323 | num_sectors = avail; | |
5324 | if (avail < num_sectors) | |
a35b0d69 N |
5325 | return -ENOSPC; |
5326 | } | |
d71f9f88 | 5327 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5328 | if (!rv) |
5329 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5330 | return rv; |
5331 | } | |
5332 | ||
da943b99 N |
5333 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5334 | { | |
5335 | int rv; | |
5336 | /* change the number of raid disks */ | |
63c70c4f | 5337 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5338 | return -EINVAL; |
5339 | if (raid_disks <= 0 || | |
5340 | raid_disks >= mddev->max_disks) | |
5341 | return -EINVAL; | |
63c70c4f | 5342 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5343 | return -EBUSY; |
63c70c4f N |
5344 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5345 | ||
5346 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
5347 | return rv; |
5348 | } | |
5349 | ||
5350 | ||
1da177e4 LT |
5351 | /* |
5352 | * update_array_info is used to change the configuration of an | |
5353 | * on-line array. | |
5354 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5355 | * fields in the info are checked against the array. | |
5356 | * Any differences that cannot be handled will cause an error. | |
5357 | * Normally, only one change can be managed at a time. | |
5358 | */ | |
5359 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5360 | { | |
5361 | int rv = 0; | |
5362 | int cnt = 0; | |
36fa3063 N |
5363 | int state = 0; |
5364 | ||
5365 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5366 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5367 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5368 | |
5369 | if (mddev->major_version != info->major_version || | |
5370 | mddev->minor_version != info->minor_version || | |
5371 | /* mddev->patch_version != info->patch_version || */ | |
5372 | mddev->ctime != info->ctime || | |
5373 | mddev->level != info->level || | |
5374 | /* mddev->layout != info->layout || */ | |
5375 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5376 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5377 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5378 | ((state^info->state) & 0xfffffe00) | |
5379 | ) | |
1da177e4 LT |
5380 | return -EINVAL; |
5381 | /* Check there is only one change */ | |
58c0fed4 AN |
5382 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5383 | cnt++; | |
5384 | if (mddev->raid_disks != info->raid_disks) | |
5385 | cnt++; | |
5386 | if (mddev->layout != info->layout) | |
5387 | cnt++; | |
5388 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5389 | cnt++; | |
5390 | if (cnt == 0) | |
5391 | return 0; | |
5392 | if (cnt > 1) | |
5393 | return -EINVAL; | |
1da177e4 LT |
5394 | |
5395 | if (mddev->layout != info->layout) { | |
5396 | /* Change layout | |
5397 | * we don't need to do anything at the md level, the | |
5398 | * personality will take care of it all. | |
5399 | */ | |
50ac168a | 5400 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5401 | return -EINVAL; |
597a711b N |
5402 | else { |
5403 | mddev->new_layout = info->layout; | |
50ac168a | 5404 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5405 | if (rv) |
5406 | mddev->new_layout = mddev->layout; | |
5407 | return rv; | |
5408 | } | |
1da177e4 | 5409 | } |
58c0fed4 | 5410 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5411 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5412 | |
da943b99 N |
5413 | if (mddev->raid_disks != info->raid_disks) |
5414 | rv = update_raid_disks(mddev, info->raid_disks); | |
5415 | ||
36fa3063 N |
5416 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5417 | if (mddev->pers->quiesce == NULL) | |
5418 | return -EINVAL; | |
5419 | if (mddev->recovery || mddev->sync_thread) | |
5420 | return -EBUSY; | |
5421 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5422 | /* add the bitmap */ | |
5423 | if (mddev->bitmap) | |
5424 | return -EEXIST; | |
c3d9714e | 5425 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5426 | return -EINVAL; |
c3d9714e N |
5427 | mddev->bitmap_info.offset = |
5428 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5429 | mddev->pers->quiesce(mddev, 1); |
5430 | rv = bitmap_create(mddev); | |
5431 | if (rv) | |
5432 | bitmap_destroy(mddev); | |
5433 | mddev->pers->quiesce(mddev, 0); | |
5434 | } else { | |
5435 | /* remove the bitmap */ | |
5436 | if (!mddev->bitmap) | |
5437 | return -ENOENT; | |
5438 | if (mddev->bitmap->file) | |
5439 | return -EINVAL; | |
5440 | mddev->pers->quiesce(mddev, 1); | |
5441 | bitmap_destroy(mddev); | |
5442 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5443 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5444 | } |
5445 | } | |
850b2b42 | 5446 | md_update_sb(mddev, 1); |
1da177e4 LT |
5447 | return rv; |
5448 | } | |
5449 | ||
5450 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5451 | { | |
5452 | mdk_rdev_t *rdev; | |
5453 | ||
5454 | if (mddev->pers == NULL) | |
5455 | return -ENODEV; | |
5456 | ||
5457 | rdev = find_rdev(mddev, dev); | |
5458 | if (!rdev) | |
5459 | return -ENODEV; | |
5460 | ||
5461 | md_error(mddev, rdev); | |
5462 | return 0; | |
5463 | } | |
5464 | ||
2f9618ce AN |
5465 | /* |
5466 | * We have a problem here : there is no easy way to give a CHS | |
5467 | * virtual geometry. We currently pretend that we have a 2 heads | |
5468 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5469 | * dosfs just mad... ;-) | |
5470 | */ | |
a885c8c4 CH |
5471 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5472 | { | |
5473 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5474 | ||
5475 | geo->heads = 2; | |
5476 | geo->sectors = 4; | |
5477 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
5478 | return 0; | |
5479 | } | |
5480 | ||
a39907fa | 5481 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5482 | unsigned int cmd, unsigned long arg) |
5483 | { | |
5484 | int err = 0; | |
5485 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
5486 | mddev_t *mddev = NULL; |
5487 | ||
5488 | if (!capable(CAP_SYS_ADMIN)) | |
5489 | return -EACCES; | |
5490 | ||
5491 | /* | |
5492 | * Commands dealing with the RAID driver but not any | |
5493 | * particular array: | |
5494 | */ | |
5495 | switch (cmd) | |
5496 | { | |
5497 | case RAID_VERSION: | |
5498 | err = get_version(argp); | |
5499 | goto done; | |
5500 | ||
5501 | case PRINT_RAID_DEBUG: | |
5502 | err = 0; | |
5503 | md_print_devices(); | |
5504 | goto done; | |
5505 | ||
5506 | #ifndef MODULE | |
5507 | case RAID_AUTORUN: | |
5508 | err = 0; | |
5509 | autostart_arrays(arg); | |
5510 | goto done; | |
5511 | #endif | |
5512 | default:; | |
5513 | } | |
5514 | ||
5515 | /* | |
5516 | * Commands creating/starting a new array: | |
5517 | */ | |
5518 | ||
a39907fa | 5519 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5520 | |
5521 | if (!mddev) { | |
5522 | BUG(); | |
5523 | goto abort; | |
5524 | } | |
5525 | ||
1da177e4 LT |
5526 | err = mddev_lock(mddev); |
5527 | if (err) { | |
5528 | printk(KERN_INFO | |
5529 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5530 | err, cmd); | |
5531 | goto abort; | |
5532 | } | |
5533 | ||
5534 | switch (cmd) | |
5535 | { | |
5536 | case SET_ARRAY_INFO: | |
5537 | { | |
5538 | mdu_array_info_t info; | |
5539 | if (!arg) | |
5540 | memset(&info, 0, sizeof(info)); | |
5541 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5542 | err = -EFAULT; | |
5543 | goto abort_unlock; | |
5544 | } | |
5545 | if (mddev->pers) { | |
5546 | err = update_array_info(mddev, &info); | |
5547 | if (err) { | |
5548 | printk(KERN_WARNING "md: couldn't update" | |
5549 | " array info. %d\n", err); | |
5550 | goto abort_unlock; | |
5551 | } | |
5552 | goto done_unlock; | |
5553 | } | |
5554 | if (!list_empty(&mddev->disks)) { | |
5555 | printk(KERN_WARNING | |
5556 | "md: array %s already has disks!\n", | |
5557 | mdname(mddev)); | |
5558 | err = -EBUSY; | |
5559 | goto abort_unlock; | |
5560 | } | |
5561 | if (mddev->raid_disks) { | |
5562 | printk(KERN_WARNING | |
5563 | "md: array %s already initialised!\n", | |
5564 | mdname(mddev)); | |
5565 | err = -EBUSY; | |
5566 | goto abort_unlock; | |
5567 | } | |
5568 | err = set_array_info(mddev, &info); | |
5569 | if (err) { | |
5570 | printk(KERN_WARNING "md: couldn't set" | |
5571 | " array info. %d\n", err); | |
5572 | goto abort_unlock; | |
5573 | } | |
5574 | } | |
5575 | goto done_unlock; | |
5576 | ||
5577 | default:; | |
5578 | } | |
5579 | ||
5580 | /* | |
5581 | * Commands querying/configuring an existing array: | |
5582 | */ | |
32a7627c | 5583 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5584 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5585 | if ((!mddev->raid_disks && !mddev->external) |
5586 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5587 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5588 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5589 | err = -ENODEV; |
5590 | goto abort_unlock; | |
5591 | } | |
5592 | ||
5593 | /* | |
5594 | * Commands even a read-only array can execute: | |
5595 | */ | |
5596 | switch (cmd) | |
5597 | { | |
5598 | case GET_ARRAY_INFO: | |
5599 | err = get_array_info(mddev, argp); | |
5600 | goto done_unlock; | |
5601 | ||
32a7627c | 5602 | case GET_BITMAP_FILE: |
87162a28 | 5603 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5604 | goto done_unlock; |
5605 | ||
1da177e4 LT |
5606 | case GET_DISK_INFO: |
5607 | err = get_disk_info(mddev, argp); | |
5608 | goto done_unlock; | |
5609 | ||
5610 | case RESTART_ARRAY_RW: | |
5611 | err = restart_array(mddev); | |
5612 | goto done_unlock; | |
5613 | ||
5614 | case STOP_ARRAY: | |
d710e138 | 5615 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5616 | goto done_unlock; |
5617 | ||
5618 | case STOP_ARRAY_RO: | |
d710e138 | 5619 | err = do_md_stop(mddev, 1, 1); |
1da177e4 LT |
5620 | goto done_unlock; |
5621 | ||
1da177e4 LT |
5622 | } |
5623 | ||
5624 | /* | |
5625 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5626 | * superblock, so we do not allow them on read-only arrays. |
5627 | * However non-MD ioctls (e.g. get-size) will still come through | |
5628 | * here and hit the 'default' below, so only disallow | |
5629 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5630 | */ |
bb57fc64 | 5631 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5632 | if (mddev->ro == 2) { |
5633 | mddev->ro = 0; | |
b62b7590 | 5634 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 NB |
5635 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5636 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5637 | } else { |
5638 | err = -EROFS; | |
5639 | goto abort_unlock; | |
5640 | } | |
1da177e4 LT |
5641 | } |
5642 | ||
5643 | switch (cmd) | |
5644 | { | |
5645 | case ADD_NEW_DISK: | |
5646 | { | |
5647 | mdu_disk_info_t info; | |
5648 | if (copy_from_user(&info, argp, sizeof(info))) | |
5649 | err = -EFAULT; | |
5650 | else | |
5651 | err = add_new_disk(mddev, &info); | |
5652 | goto done_unlock; | |
5653 | } | |
5654 | ||
5655 | case HOT_REMOVE_DISK: | |
5656 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5657 | goto done_unlock; | |
5658 | ||
5659 | case HOT_ADD_DISK: | |
5660 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5661 | goto done_unlock; | |
5662 | ||
5663 | case SET_DISK_FAULTY: | |
5664 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5665 | goto done_unlock; | |
5666 | ||
5667 | case RUN_ARRAY: | |
d710e138 | 5668 | err = do_md_run(mddev); |
1da177e4 LT |
5669 | goto done_unlock; |
5670 | ||
32a7627c N |
5671 | case SET_BITMAP_FILE: |
5672 | err = set_bitmap_file(mddev, (int)arg); | |
5673 | goto done_unlock; | |
5674 | ||
1da177e4 | 5675 | default: |
1da177e4 LT |
5676 | err = -EINVAL; |
5677 | goto abort_unlock; | |
5678 | } | |
5679 | ||
5680 | done_unlock: | |
5681 | abort_unlock: | |
d3374825 N |
5682 | if (mddev->hold_active == UNTIL_IOCTL && |
5683 | err != -EINVAL) | |
5684 | mddev->hold_active = 0; | |
1da177e4 LT |
5685 | mddev_unlock(mddev); |
5686 | ||
5687 | return err; | |
5688 | done: | |
5689 | if (err) | |
5690 | MD_BUG(); | |
5691 | abort: | |
5692 | return err; | |
5693 | } | |
5694 | ||
a39907fa | 5695 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5696 | { |
5697 | /* | |
5698 | * Succeed if we can lock the mddev, which confirms that | |
5699 | * it isn't being stopped right now. | |
5700 | */ | |
d3374825 | 5701 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5702 | int err; |
5703 | ||
d3374825 N |
5704 | if (mddev->gendisk != bdev->bd_disk) { |
5705 | /* we are racing with mddev_put which is discarding this | |
5706 | * bd_disk. | |
5707 | */ | |
5708 | mddev_put(mddev); | |
5709 | /* Wait until bdev->bd_disk is definitely gone */ | |
5710 | flush_scheduled_work(); | |
5711 | /* Then retry the open from the top */ | |
5712 | return -ERESTARTSYS; | |
5713 | } | |
5714 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5715 | ||
c8c00a69 | 5716 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
5717 | goto out; |
5718 | ||
5719 | err = 0; | |
f2ea68cf | 5720 | atomic_inc(&mddev->openers); |
c8c00a69 | 5721 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 5722 | |
a39907fa | 5723 | check_disk_change(bdev); |
1da177e4 LT |
5724 | out: |
5725 | return err; | |
5726 | } | |
5727 | ||
a39907fa | 5728 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5729 | { |
a39907fa | 5730 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5731 | |
52e5f9d1 | 5732 | BUG_ON(!mddev); |
f2ea68cf | 5733 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5734 | mddev_put(mddev); |
5735 | ||
5736 | return 0; | |
5737 | } | |
5738 | ||
44ce6294 LT |
5739 | static int md_media_changed(struct gendisk *disk) |
5740 | { | |
5741 | mddev_t *mddev = disk->private_data; | |
5742 | ||
5743 | return mddev->changed; | |
5744 | } | |
5745 | ||
5746 | static int md_revalidate(struct gendisk *disk) | |
5747 | { | |
5748 | mddev_t *mddev = disk->private_data; | |
5749 | ||
5750 | mddev->changed = 0; | |
5751 | return 0; | |
5752 | } | |
83d5cde4 | 5753 | static const struct block_device_operations md_fops = |
1da177e4 LT |
5754 | { |
5755 | .owner = THIS_MODULE, | |
a39907fa AV |
5756 | .open = md_open, |
5757 | .release = md_release, | |
b492b852 | 5758 | .ioctl = md_ioctl, |
a885c8c4 | 5759 | .getgeo = md_getgeo, |
44ce6294 LT |
5760 | .media_changed = md_media_changed, |
5761 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5762 | }; |
5763 | ||
75c96f85 | 5764 | static int md_thread(void * arg) |
1da177e4 LT |
5765 | { |
5766 | mdk_thread_t *thread = arg; | |
5767 | ||
1da177e4 LT |
5768 | /* |
5769 | * md_thread is a 'system-thread', it's priority should be very | |
5770 | * high. We avoid resource deadlocks individually in each | |
5771 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5772 | * the very same RT priority as kswapd, thus we will never get | |
5773 | * into a priority inversion deadlock. | |
5774 | * | |
5775 | * we definitely have to have equal or higher priority than | |
5776 | * bdflush, otherwise bdflush will deadlock if there are too | |
5777 | * many dirty RAID5 blocks. | |
5778 | */ | |
1da177e4 | 5779 | |
6985c43f | 5780 | allow_signal(SIGKILL); |
a6fb0934 | 5781 | while (!kthread_should_stop()) { |
1da177e4 | 5782 | |
93588e22 N |
5783 | /* We need to wait INTERRUPTIBLE so that |
5784 | * we don't add to the load-average. | |
5785 | * That means we need to be sure no signals are | |
5786 | * pending | |
5787 | */ | |
5788 | if (signal_pending(current)) | |
5789 | flush_signals(current); | |
5790 | ||
5791 | wait_event_interruptible_timeout | |
5792 | (thread->wqueue, | |
5793 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5794 | || kthread_should_stop(), | |
5795 | thread->timeout); | |
1da177e4 LT |
5796 | |
5797 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5798 | ||
787453c2 | 5799 | thread->run(thread->mddev); |
1da177e4 | 5800 | } |
a6fb0934 | 5801 | |
1da177e4 LT |
5802 | return 0; |
5803 | } | |
5804 | ||
5805 | void md_wakeup_thread(mdk_thread_t *thread) | |
5806 | { | |
5807 | if (thread) { | |
5808 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5809 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5810 | wake_up(&thread->wqueue); | |
5811 | } | |
5812 | } | |
5813 | ||
5814 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5815 | const char *name) | |
5816 | { | |
5817 | mdk_thread_t *thread; | |
1da177e4 | 5818 | |
9ffae0cf | 5819 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5820 | if (!thread) |
5821 | return NULL; | |
5822 | ||
1da177e4 LT |
5823 | init_waitqueue_head(&thread->wqueue); |
5824 | ||
1da177e4 LT |
5825 | thread->run = run; |
5826 | thread->mddev = mddev; | |
32a7627c | 5827 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
5828 | thread->tsk = kthread_run(md_thread, thread, |
5829 | "%s_%s", | |
5830 | mdname(thread->mddev), | |
5831 | name ?: mddev->pers->name); | |
a6fb0934 | 5832 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5833 | kfree(thread); |
5834 | return NULL; | |
5835 | } | |
1da177e4 LT |
5836 | return thread; |
5837 | } | |
5838 | ||
1da177e4 LT |
5839 | void md_unregister_thread(mdk_thread_t *thread) |
5840 | { | |
e0cf8f04 N |
5841 | if (!thread) |
5842 | return; | |
ba25f9dc | 5843 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5844 | |
5845 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5846 | kfree(thread); |
5847 | } | |
5848 | ||
5849 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5850 | { | |
5851 | if (!mddev) { | |
5852 | MD_BUG(); | |
5853 | return; | |
5854 | } | |
5855 | ||
b2d444d7 | 5856 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5857 | return; |
6bfe0b49 DW |
5858 | |
5859 | if (mddev->external) | |
5860 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5861 | /* |
1da177e4 LT |
5862 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5863 | mdname(mddev), | |
5864 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5865 | __builtin_return_address(0),__builtin_return_address(1), | |
5866 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5867 | */ |
d0a0a5ee AM |
5868 | if (!mddev->pers) |
5869 | return; | |
1da177e4 LT |
5870 | if (!mddev->pers->error_handler) |
5871 | return; | |
5872 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5873 | if (mddev->degraded) |
5874 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5875 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5876 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5877 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5878 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5879 | md_new_event_inintr(mddev); |
1da177e4 LT |
5880 | } |
5881 | ||
5882 | /* seq_file implementation /proc/mdstat */ | |
5883 | ||
5884 | static void status_unused(struct seq_file *seq) | |
5885 | { | |
5886 | int i = 0; | |
5887 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5888 | |
5889 | seq_printf(seq, "unused devices: "); | |
5890 | ||
159ec1fc | 5891 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
5892 | char b[BDEVNAME_SIZE]; |
5893 | i++; | |
5894 | seq_printf(seq, "%s ", | |
5895 | bdevname(rdev->bdev,b)); | |
5896 | } | |
5897 | if (!i) | |
5898 | seq_printf(seq, "<none>"); | |
5899 | ||
5900 | seq_printf(seq, "\n"); | |
5901 | } | |
5902 | ||
5903 | ||
5904 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5905 | { | |
dd71cf6b N |
5906 | sector_t max_sectors, resync, res; |
5907 | unsigned long dt, db; | |
5908 | sector_t rt; | |
4588b42e N |
5909 | int scale; |
5910 | unsigned int per_milli; | |
1da177e4 | 5911 | |
dd71cf6b | 5912 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5913 | |
5914 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 5915 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 5916 | else |
dd71cf6b | 5917 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
5918 | |
5919 | /* | |
5920 | * Should not happen. | |
5921 | */ | |
dd71cf6b | 5922 | if (!max_sectors) { |
1da177e4 LT |
5923 | MD_BUG(); |
5924 | return; | |
5925 | } | |
4588b42e | 5926 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 5927 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
5928 | * u32, as those are the requirements for sector_div. |
5929 | * Thus 'scale' must be at least 10 | |
5930 | */ | |
5931 | scale = 10; | |
5932 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 5933 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
5934 | scale++; |
5935 | } | |
5936 | res = (resync>>scale)*1000; | |
dd71cf6b | 5937 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
5938 | |
5939 | per_milli = res; | |
1da177e4 | 5940 | { |
4588b42e | 5941 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5942 | seq_printf(seq, "["); |
5943 | for (i = 0; i < x; i++) | |
5944 | seq_printf(seq, "="); | |
5945 | seq_printf(seq, ">"); | |
5946 | for (i = 0; i < y; i++) | |
5947 | seq_printf(seq, "."); | |
5948 | seq_printf(seq, "] "); | |
5949 | } | |
4588b42e | 5950 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5951 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5952 | "reshape" : | |
61df9d91 N |
5953 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5954 | "check" : | |
5955 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5956 | "resync" : "recovery"))), | |
5957 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
5958 | (unsigned long long) resync/2, |
5959 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
5960 | |
5961 | /* | |
1da177e4 LT |
5962 | * dt: time from mark until now |
5963 | * db: blocks written from mark until now | |
5964 | * rt: remaining time | |
dd71cf6b N |
5965 | * |
5966 | * rt is a sector_t, so could be 32bit or 64bit. | |
5967 | * So we divide before multiply in case it is 32bit and close | |
5968 | * to the limit. | |
5969 | * We scale the divisor (db) by 32 to avoid loosing precision | |
5970 | * near the end of resync when the number of remaining sectors | |
5971 | * is close to 'db'. | |
5972 | * We then divide rt by 32 after multiplying by db to compensate. | |
5973 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
5974 | */ |
5975 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5976 | if (!dt) dt++; | |
ff4e8d9a N |
5977 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5978 | - mddev->resync_mark_cnt; | |
1da177e4 | 5979 | |
dd71cf6b N |
5980 | rt = max_sectors - resync; /* number of remaining sectors */ |
5981 | sector_div(rt, db/32+1); | |
5982 | rt *= dt; | |
5983 | rt >>= 5; | |
5984 | ||
5985 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
5986 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 5987 | |
ff4e8d9a | 5988 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
5989 | } |
5990 | ||
5991 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
5992 | { | |
5993 | struct list_head *tmp; | |
5994 | loff_t l = *pos; | |
5995 | mddev_t *mddev; | |
5996 | ||
5997 | if (l >= 0x10000) | |
5998 | return NULL; | |
5999 | if (!l--) | |
6000 | /* header */ | |
6001 | return (void*)1; | |
6002 | ||
6003 | spin_lock(&all_mddevs_lock); | |
6004 | list_for_each(tmp,&all_mddevs) | |
6005 | if (!l--) { | |
6006 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6007 | mddev_get(mddev); | |
6008 | spin_unlock(&all_mddevs_lock); | |
6009 | return mddev; | |
6010 | } | |
6011 | spin_unlock(&all_mddevs_lock); | |
6012 | if (!l--) | |
6013 | return (void*)2;/* tail */ | |
6014 | return NULL; | |
6015 | } | |
6016 | ||
6017 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6018 | { | |
6019 | struct list_head *tmp; | |
6020 | mddev_t *next_mddev, *mddev = v; | |
6021 | ||
6022 | ++*pos; | |
6023 | if (v == (void*)2) | |
6024 | return NULL; | |
6025 | ||
6026 | spin_lock(&all_mddevs_lock); | |
6027 | if (v == (void*)1) | |
6028 | tmp = all_mddevs.next; | |
6029 | else | |
6030 | tmp = mddev->all_mddevs.next; | |
6031 | if (tmp != &all_mddevs) | |
6032 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6033 | else { | |
6034 | next_mddev = (void*)2; | |
6035 | *pos = 0x10000; | |
6036 | } | |
6037 | spin_unlock(&all_mddevs_lock); | |
6038 | ||
6039 | if (v != (void*)1) | |
6040 | mddev_put(mddev); | |
6041 | return next_mddev; | |
6042 | ||
6043 | } | |
6044 | ||
6045 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6046 | { | |
6047 | mddev_t *mddev = v; | |
6048 | ||
6049 | if (mddev && v != (void*)1 && v != (void*)2) | |
6050 | mddev_put(mddev); | |
6051 | } | |
6052 | ||
d7603b7e N |
6053 | struct mdstat_info { |
6054 | int event; | |
6055 | }; | |
6056 | ||
1da177e4 LT |
6057 | static int md_seq_show(struct seq_file *seq, void *v) |
6058 | { | |
6059 | mddev_t *mddev = v; | |
dd8ac336 | 6060 | sector_t sectors; |
1da177e4 | 6061 | mdk_rdev_t *rdev; |
d7603b7e | 6062 | struct mdstat_info *mi = seq->private; |
32a7627c | 6063 | struct bitmap *bitmap; |
1da177e4 LT |
6064 | |
6065 | if (v == (void*)1) { | |
2604b703 | 6066 | struct mdk_personality *pers; |
1da177e4 LT |
6067 | seq_printf(seq, "Personalities : "); |
6068 | spin_lock(&pers_lock); | |
2604b703 N |
6069 | list_for_each_entry(pers, &pers_list, list) |
6070 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6071 | |
6072 | spin_unlock(&pers_lock); | |
6073 | seq_printf(seq, "\n"); | |
d7603b7e | 6074 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6075 | return 0; |
6076 | } | |
6077 | if (v == (void*)2) { | |
6078 | status_unused(seq); | |
6079 | return 0; | |
6080 | } | |
6081 | ||
5dc5cf7d | 6082 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6083 | return -EINTR; |
5dc5cf7d | 6084 | |
1da177e4 LT |
6085 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6086 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6087 | mddev->pers ? "" : "in"); | |
6088 | if (mddev->pers) { | |
f91de92e | 6089 | if (mddev->ro==1) |
1da177e4 | 6090 | seq_printf(seq, " (read-only)"); |
f91de92e | 6091 | if (mddev->ro==2) |
52720ae7 | 6092 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6093 | seq_printf(seq, " %s", mddev->pers->name); |
6094 | } | |
6095 | ||
dd8ac336 | 6096 | sectors = 0; |
159ec1fc | 6097 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6098 | char b[BDEVNAME_SIZE]; |
6099 | seq_printf(seq, " %s[%d]", | |
6100 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6101 | if (test_bit(WriteMostly, &rdev->flags)) |
6102 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6103 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6104 | seq_printf(seq, "(F)"); |
6105 | continue; | |
b325a32e N |
6106 | } else if (rdev->raid_disk < 0) |
6107 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6108 | sectors += rdev->sectors; |
1da177e4 LT |
6109 | } |
6110 | ||
6111 | if (!list_empty(&mddev->disks)) { | |
6112 | if (mddev->pers) | |
6113 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6114 | (unsigned long long) |
6115 | mddev->array_sectors / 2); | |
1da177e4 LT |
6116 | else |
6117 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6118 | (unsigned long long)sectors / 2); |
1da177e4 | 6119 | } |
1cd6bf19 N |
6120 | if (mddev->persistent) { |
6121 | if (mddev->major_version != 0 || | |
6122 | mddev->minor_version != 90) { | |
6123 | seq_printf(seq," super %d.%d", | |
6124 | mddev->major_version, | |
6125 | mddev->minor_version); | |
6126 | } | |
e691063a N |
6127 | } else if (mddev->external) |
6128 | seq_printf(seq, " super external:%s", | |
6129 | mddev->metadata_type); | |
6130 | else | |
1cd6bf19 | 6131 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6132 | |
6133 | if (mddev->pers) { | |
d710e138 | 6134 | mddev->pers->status(seq, mddev); |
1da177e4 | 6135 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6136 | if (mddev->pers->sync_request) { |
6137 | if (mddev->curr_resync > 2) { | |
d710e138 | 6138 | status_resync(seq, mddev); |
8e1b39d6 N |
6139 | seq_printf(seq, "\n "); |
6140 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6141 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6142 | else if (mddev->recovery_cp < MaxSector) | |
6143 | seq_printf(seq, "\tresync=PENDING\n "); | |
6144 | } | |
32a7627c N |
6145 | } else |
6146 | seq_printf(seq, "\n "); | |
6147 | ||
6148 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6149 | unsigned long chunk_kb; |
6150 | unsigned long flags; | |
32a7627c | 6151 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6152 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6153 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6154 | "%lu%s chunk", | |
6155 | bitmap->pages - bitmap->missing_pages, | |
6156 | bitmap->pages, | |
6157 | (bitmap->pages - bitmap->missing_pages) | |
6158 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6159 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6160 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6161 | if (bitmap->file) { |
6162 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6163 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6164 | } |
78d742d8 | 6165 | |
32a7627c N |
6166 | seq_printf(seq, "\n"); |
6167 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6168 | } |
6169 | ||
6170 | seq_printf(seq, "\n"); | |
6171 | } | |
6172 | mddev_unlock(mddev); | |
6173 | ||
6174 | return 0; | |
6175 | } | |
6176 | ||
110518bc | 6177 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6178 | .start = md_seq_start, |
6179 | .next = md_seq_next, | |
6180 | .stop = md_seq_stop, | |
6181 | .show = md_seq_show, | |
6182 | }; | |
6183 | ||
6184 | static int md_seq_open(struct inode *inode, struct file *file) | |
6185 | { | |
6186 | int error; | |
d7603b7e N |
6187 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6188 | if (mi == NULL) | |
6189 | return -ENOMEM; | |
1da177e4 LT |
6190 | |
6191 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6192 | if (error) |
6193 | kfree(mi); | |
6194 | else { | |
6195 | struct seq_file *p = file->private_data; | |
6196 | p->private = mi; | |
6197 | mi->event = atomic_read(&md_event_count); | |
6198 | } | |
1da177e4 LT |
6199 | return error; |
6200 | } | |
6201 | ||
d7603b7e N |
6202 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6203 | { | |
6204 | struct seq_file *m = filp->private_data; | |
6205 | struct mdstat_info *mi = m->private; | |
6206 | int mask; | |
6207 | ||
6208 | poll_wait(filp, &md_event_waiters, wait); | |
6209 | ||
6210 | /* always allow read */ | |
6211 | mask = POLLIN | POLLRDNORM; | |
6212 | ||
6213 | if (mi->event != atomic_read(&md_event_count)) | |
6214 | mask |= POLLERR | POLLPRI; | |
6215 | return mask; | |
6216 | } | |
6217 | ||
fa027c2a | 6218 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6219 | .owner = THIS_MODULE, |
1da177e4 LT |
6220 | .open = md_seq_open, |
6221 | .read = seq_read, | |
6222 | .llseek = seq_lseek, | |
c3f94b40 | 6223 | .release = seq_release_private, |
d7603b7e | 6224 | .poll = mdstat_poll, |
1da177e4 LT |
6225 | }; |
6226 | ||
2604b703 | 6227 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6228 | { |
1da177e4 | 6229 | spin_lock(&pers_lock); |
2604b703 N |
6230 | list_add_tail(&p->list, &pers_list); |
6231 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6232 | spin_unlock(&pers_lock); |
6233 | return 0; | |
6234 | } | |
6235 | ||
2604b703 | 6236 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6237 | { |
2604b703 | 6238 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6239 | spin_lock(&pers_lock); |
2604b703 | 6240 | list_del_init(&p->list); |
1da177e4 LT |
6241 | spin_unlock(&pers_lock); |
6242 | return 0; | |
6243 | } | |
6244 | ||
eea1bf38 | 6245 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6246 | { |
6247 | mdk_rdev_t * rdev; | |
1da177e4 | 6248 | int idle; |
eea1bf38 | 6249 | int curr_events; |
1da177e4 LT |
6250 | |
6251 | idle = 1; | |
4b80991c N |
6252 | rcu_read_lock(); |
6253 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6254 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6255 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6256 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6257 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6258 | /* sync IO will cause sync_io to increase before the disk_stats |
6259 | * as sync_io is counted when a request starts, and | |
6260 | * disk_stats is counted when it completes. | |
6261 | * So resync activity will cause curr_events to be smaller than | |
6262 | * when there was no such activity. | |
6263 | * non-sync IO will cause disk_stat to increase without | |
6264 | * increasing sync_io so curr_events will (eventually) | |
6265 | * be larger than it was before. Once it becomes | |
6266 | * substantially larger, the test below will cause | |
6267 | * the array to appear non-idle, and resync will slow | |
6268 | * down. | |
6269 | * If there is a lot of outstanding resync activity when | |
6270 | * we set last_event to curr_events, then all that activity | |
6271 | * completing might cause the array to appear non-idle | |
6272 | * and resync will be slowed down even though there might | |
6273 | * not have been non-resync activity. This will only | |
6274 | * happen once though. 'last_events' will soon reflect | |
6275 | * the state where there is little or no outstanding | |
6276 | * resync requests, and further resync activity will | |
6277 | * always make curr_events less than last_events. | |
c0e48521 | 6278 | * |
1da177e4 | 6279 | */ |
eea1bf38 | 6280 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6281 | rdev->last_events = curr_events; |
6282 | idle = 0; | |
6283 | } | |
6284 | } | |
4b80991c | 6285 | rcu_read_unlock(); |
1da177e4 LT |
6286 | return idle; |
6287 | } | |
6288 | ||
6289 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6290 | { | |
6291 | /* another "blocks" (512byte) blocks have been synced */ | |
6292 | atomic_sub(blocks, &mddev->recovery_active); | |
6293 | wake_up(&mddev->recovery_wait); | |
6294 | if (!ok) { | |
dfc70645 | 6295 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6296 | md_wakeup_thread(mddev->thread); |
6297 | // stop recovery, signal do_sync .... | |
6298 | } | |
6299 | } | |
6300 | ||
6301 | ||
06d91a5f N |
6302 | /* md_write_start(mddev, bi) |
6303 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6304 | * in superblock) before writing, schedule a superblock update |
6305 | * and wait for it to complete. | |
06d91a5f | 6306 | */ |
3d310eb7 | 6307 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6308 | { |
0fd62b86 | 6309 | int did_change = 0; |
06d91a5f | 6310 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6311 | return; |
06d91a5f | 6312 | |
f91de92e N |
6313 | BUG_ON(mddev->ro == 1); |
6314 | if (mddev->ro == 2) { | |
6315 | /* need to switch to read/write */ | |
6316 | mddev->ro = 0; | |
6317 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6318 | md_wakeup_thread(mddev->thread); | |
25156198 | 6319 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6320 | did_change = 1; |
f91de92e | 6321 | } |
06d91a5f | 6322 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6323 | if (mddev->safemode == 1) |
6324 | mddev->safemode = 0; | |
06d91a5f | 6325 | if (mddev->in_sync) { |
a9701a30 | 6326 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6327 | if (mddev->in_sync) { |
6328 | mddev->in_sync = 0; | |
850b2b42 | 6329 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 6330 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6331 | did_change = 1; |
3d310eb7 | 6332 | } |
a9701a30 | 6333 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6334 | } |
0fd62b86 | 6335 | if (did_change) |
b62b7590 | 6336 | sysfs_notify_dirent(mddev->sysfs_state); |
09a44cc1 N |
6337 | wait_event(mddev->sb_wait, |
6338 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
6339 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
6340 | } |
6341 | ||
6342 | void md_write_end(mddev_t *mddev) | |
6343 | { | |
6344 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6345 | if (mddev->safemode == 2) | |
6346 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6347 | else if (mddev->safemode_delay) |
1da177e4 LT |
6348 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6349 | } | |
6350 | } | |
6351 | ||
2a2275d6 N |
6352 | /* md_allow_write(mddev) |
6353 | * Calling this ensures that the array is marked 'active' so that writes | |
6354 | * may proceed without blocking. It is important to call this before | |
6355 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6356 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6357 | * |
6358 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6359 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6360 | */ |
b5470dc5 | 6361 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6362 | { |
6363 | if (!mddev->pers) | |
b5470dc5 | 6364 | return 0; |
2a2275d6 | 6365 | if (mddev->ro) |
b5470dc5 | 6366 | return 0; |
1a0fd497 | 6367 | if (!mddev->pers->sync_request) |
b5470dc5 | 6368 | return 0; |
2a2275d6 N |
6369 | |
6370 | spin_lock_irq(&mddev->write_lock); | |
6371 | if (mddev->in_sync) { | |
6372 | mddev->in_sync = 0; | |
6373 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6374 | if (mddev->safemode_delay && | |
6375 | mddev->safemode == 0) | |
6376 | mddev->safemode = 1; | |
6377 | spin_unlock_irq(&mddev->write_lock); | |
6378 | md_update_sb(mddev, 0); | |
b62b7590 | 6379 | sysfs_notify_dirent(mddev->sysfs_state); |
2a2275d6 N |
6380 | } else |
6381 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
6382 | |
6383 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
6384 | return -EAGAIN; | |
6385 | else | |
6386 | return 0; | |
2a2275d6 N |
6387 | } |
6388 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6389 | ||
1da177e4 LT |
6390 | #define SYNC_MARKS 10 |
6391 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6392 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6393 | { |
6394 | mddev_t *mddev2; | |
6395 | unsigned int currspeed = 0, | |
6396 | window; | |
57afd89f | 6397 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6398 | unsigned long mark[SYNC_MARKS]; |
6399 | sector_t mark_cnt[SYNC_MARKS]; | |
6400 | int last_mark,m; | |
6401 | struct list_head *tmp; | |
6402 | sector_t last_check; | |
57afd89f | 6403 | int skipped = 0; |
5fd6c1dc | 6404 | mdk_rdev_t *rdev; |
61df9d91 | 6405 | char *desc; |
1da177e4 LT |
6406 | |
6407 | /* just incase thread restarts... */ | |
6408 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6409 | return; | |
5fd6c1dc N |
6410 | if (mddev->ro) /* never try to sync a read-only array */ |
6411 | return; | |
1da177e4 | 6412 | |
61df9d91 N |
6413 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6414 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6415 | desc = "data-check"; | |
6416 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6417 | desc = "requested-resync"; | |
6418 | else | |
6419 | desc = "resync"; | |
6420 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6421 | desc = "reshape"; | |
6422 | else | |
6423 | desc = "recovery"; | |
6424 | ||
1da177e4 LT |
6425 | /* we overload curr_resync somewhat here. |
6426 | * 0 == not engaged in resync at all | |
6427 | * 2 == checking that there is no conflict with another sync | |
6428 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6429 | * commense | |
6430 | * other == active in resync - this many blocks | |
6431 | * | |
6432 | * Before starting a resync we must have set curr_resync to | |
6433 | * 2, and then checked that every "conflicting" array has curr_resync | |
6434 | * less than ours. When we find one that is the same or higher | |
6435 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6436 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6437 | * This will mean we have to start checking from the beginning again. | |
6438 | * | |
6439 | */ | |
6440 | ||
6441 | do { | |
6442 | mddev->curr_resync = 2; | |
6443 | ||
6444 | try_again: | |
787453c2 | 6445 | if (kthread_should_stop()) { |
6985c43f | 6446 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6447 | goto skip; |
6448 | } | |
29ac4aa3 | 6449 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6450 | if (mddev2 == mddev) |
6451 | continue; | |
90b08710 BS |
6452 | if (!mddev->parallel_resync |
6453 | && mddev2->curr_resync | |
6454 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6455 | DEFINE_WAIT(wq); |
6456 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6457 | /* arbitrarily yield */ | |
6458 | mddev->curr_resync = 1; | |
6459 | wake_up(&resync_wait); | |
6460 | } | |
6461 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6462 | /* no need to wait here, we can wait the next | |
6463 | * time 'round when curr_resync == 2 | |
6464 | */ | |
6465 | continue; | |
9744197c N |
6466 | /* We need to wait 'interruptible' so as not to |
6467 | * contribute to the load average, and not to | |
6468 | * be caught by 'softlockup' | |
6469 | */ | |
6470 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6471 | if (!kthread_should_stop() && |
8712e553 | 6472 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6473 | printk(KERN_INFO "md: delaying %s of %s" |
6474 | " until %s has finished (they" | |
1da177e4 | 6475 | " share one or more physical units)\n", |
61df9d91 | 6476 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6477 | mddev_put(mddev2); |
9744197c N |
6478 | if (signal_pending(current)) |
6479 | flush_signals(current); | |
1da177e4 LT |
6480 | schedule(); |
6481 | finish_wait(&resync_wait, &wq); | |
6482 | goto try_again; | |
6483 | } | |
6484 | finish_wait(&resync_wait, &wq); | |
6485 | } | |
6486 | } | |
6487 | } while (mddev->curr_resync < 2); | |
6488 | ||
5fd6c1dc | 6489 | j = 0; |
9d88883e | 6490 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6491 | /* resync follows the size requested by the personality, |
57afd89f | 6492 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6493 | */ |
6494 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6495 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6496 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6497 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6498 | j = mddev->resync_min; | |
6499 | else if (!mddev->bitmap) | |
5fd6c1dc | 6500 | j = mddev->recovery_cp; |
5e96ee65 | 6501 | |
ccfcc3c1 | 6502 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6503 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6504 | else { |
1da177e4 | 6505 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6506 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6507 | j = MaxSector; |
159ec1fc | 6508 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6509 | if (rdev->raid_disk >= 0 && |
6510 | !test_bit(Faulty, &rdev->flags) && | |
6511 | !test_bit(In_sync, &rdev->flags) && | |
6512 | rdev->recovery_offset < j) | |
6513 | j = rdev->recovery_offset; | |
6514 | } | |
1da177e4 | 6515 | |
61df9d91 N |
6516 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6517 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6518 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6519 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6520 | "(but not more than %d KB/sec) for %s.\n", |
6521 | speed_max(mddev), desc); | |
1da177e4 | 6522 | |
eea1bf38 | 6523 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6524 | |
57afd89f | 6525 | io_sectors = 0; |
1da177e4 LT |
6526 | for (m = 0; m < SYNC_MARKS; m++) { |
6527 | mark[m] = jiffies; | |
57afd89f | 6528 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6529 | } |
6530 | last_mark = 0; | |
6531 | mddev->resync_mark = mark[last_mark]; | |
6532 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6533 | ||
6534 | /* | |
6535 | * Tune reconstruction: | |
6536 | */ | |
6537 | window = 32*(PAGE_SIZE/512); | |
6538 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6539 | window/2,(unsigned long long) max_sectors/2); | |
6540 | ||
6541 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6542 | last_check = 0; |
6543 | ||
6544 | if (j>2) { | |
6545 | printk(KERN_INFO | |
61df9d91 N |
6546 | "md: resuming %s of %s from checkpoint.\n", |
6547 | desc, mdname(mddev)); | |
1da177e4 LT |
6548 | mddev->curr_resync = j; |
6549 | } | |
efa59339 | 6550 | mddev->curr_resync_completed = mddev->curr_resync; |
1da177e4 LT |
6551 | |
6552 | while (j < max_sectors) { | |
57afd89f | 6553 | sector_t sectors; |
1da177e4 | 6554 | |
57afd89f | 6555 | skipped = 0; |
97e4f42d | 6556 | |
7a91ee1f N |
6557 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6558 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
6559 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6560 | > (max_sectors >> 4)) || | |
6561 | (j - mddev->curr_resync_completed)*2 | |
6562 | >= mddev->resync_max - mddev->curr_resync_completed | |
6563 | )) { | |
97e4f42d N |
6564 | /* time to update curr_resync_completed */ |
6565 | blk_unplug(mddev->queue); | |
6566 | wait_event(mddev->recovery_wait, | |
6567 | atomic_read(&mddev->recovery_active) == 0); | |
6568 | mddev->curr_resync_completed = | |
6569 | mddev->curr_resync; | |
6570 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
acb180b0 | 6571 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 6572 | } |
acb180b0 | 6573 | |
e62e58a5 N |
6574 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
6575 | /* As this condition is controlled by user-space, | |
6576 | * we can block indefinitely, so use '_interruptible' | |
6577 | * to avoid triggering warnings. | |
6578 | */ | |
6579 | flush_signals(current); /* just in case */ | |
6580 | wait_event_interruptible(mddev->recovery_wait, | |
6581 | mddev->resync_max > j | |
6582 | || kthread_should_stop()); | |
6583 | } | |
acb180b0 N |
6584 | |
6585 | if (kthread_should_stop()) | |
6586 | goto interrupted; | |
6587 | ||
57afd89f | 6588 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6589 | currspeed < speed_min(mddev)); |
57afd89f | 6590 | if (sectors == 0) { |
dfc70645 | 6591 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6592 | goto out; |
6593 | } | |
57afd89f N |
6594 | |
6595 | if (!skipped) { /* actual IO requested */ | |
6596 | io_sectors += sectors; | |
6597 | atomic_add(sectors, &mddev->recovery_active); | |
6598 | } | |
6599 | ||
1da177e4 LT |
6600 | j += sectors; |
6601 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6602 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6603 | if (last_check == 0) |
6604 | /* this is the earliers that rebuilt will be | |
6605 | * visible in /proc/mdstat | |
6606 | */ | |
6607 | md_new_event(mddev); | |
57afd89f N |
6608 | |
6609 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6610 | continue; |
6611 | ||
57afd89f | 6612 | last_check = io_sectors; |
1da177e4 | 6613 | |
dfc70645 | 6614 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6615 | break; |
6616 | ||
6617 | repeat: | |
6618 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6619 | /* step marks */ | |
6620 | int next = (last_mark+1) % SYNC_MARKS; | |
6621 | ||
6622 | mddev->resync_mark = mark[next]; | |
6623 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6624 | mark[next] = jiffies; | |
57afd89f | 6625 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6626 | last_mark = next; |
6627 | } | |
6628 | ||
6629 | ||
c6207277 N |
6630 | if (kthread_should_stop()) |
6631 | goto interrupted; | |
6632 | ||
1da177e4 LT |
6633 | |
6634 | /* | |
6635 | * this loop exits only if either when we are slower than | |
6636 | * the 'hard' speed limit, or the system was IO-idle for | |
6637 | * a jiffy. | |
6638 | * the system might be non-idle CPU-wise, but we only care | |
6639 | * about not overloading the IO subsystem. (things like an | |
6640 | * e2fsck being done on the RAID array should execute fast) | |
6641 | */ | |
2ad8b1ef | 6642 | blk_unplug(mddev->queue); |
1da177e4 LT |
6643 | cond_resched(); |
6644 | ||
57afd89f N |
6645 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6646 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6647 | |
88202a0c N |
6648 | if (currspeed > speed_min(mddev)) { |
6649 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6650 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6651 | msleep(500); |
1da177e4 LT |
6652 | goto repeat; |
6653 | } | |
6654 | } | |
6655 | } | |
61df9d91 | 6656 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6657 | /* |
6658 | * this also signals 'finished resyncing' to md_stop | |
6659 | */ | |
6660 | out: | |
2ad8b1ef | 6661 | blk_unplug(mddev->queue); |
1da177e4 LT |
6662 | |
6663 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6664 | ||
6665 | /* tell personality that we are finished */ | |
57afd89f | 6666 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6667 | |
dfc70645 | 6668 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6669 | mddev->curr_resync > 2) { |
6670 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6671 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6672 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6673 | printk(KERN_INFO | |
61df9d91 N |
6674 | "md: checkpointing %s of %s.\n", |
6675 | desc, mdname(mddev)); | |
5fd6c1dc N |
6676 | mddev->recovery_cp = mddev->curr_resync; |
6677 | } | |
6678 | } else | |
6679 | mddev->recovery_cp = MaxSector; | |
6680 | } else { | |
6681 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6682 | mddev->curr_resync = MaxSector; | |
159ec1fc | 6683 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6684 | if (rdev->raid_disk >= 0 && |
6685 | !test_bit(Faulty, &rdev->flags) && | |
6686 | !test_bit(In_sync, &rdev->flags) && | |
6687 | rdev->recovery_offset < mddev->curr_resync) | |
6688 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 6689 | } |
1da177e4 | 6690 | } |
17571284 | 6691 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6692 | |
1da177e4 | 6693 | skip: |
c07b70ad N |
6694 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
6695 | /* We completed so min/max setting can be forgotten if used. */ | |
6696 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6697 | mddev->resync_min = 0; | |
6698 | mddev->resync_max = MaxSector; | |
6699 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6700 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 | 6701 | mddev->curr_resync = 0; |
efa59339 N |
6702 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
6703 | mddev->curr_resync_completed = 0; | |
c6207277 | 6704 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
1da177e4 LT |
6705 | wake_up(&resync_wait); |
6706 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6707 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6708 | return; |
6709 | ||
6710 | interrupted: | |
6711 | /* | |
6712 | * got a signal, exit. | |
6713 | */ | |
6714 | printk(KERN_INFO | |
6715 | "md: md_do_sync() got signal ... exiting\n"); | |
6716 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6717 | goto out; | |
6718 | ||
1da177e4 | 6719 | } |
29269553 | 6720 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6721 | |
6722 | ||
b4c4c7b8 N |
6723 | static int remove_and_add_spares(mddev_t *mddev) |
6724 | { | |
6725 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6726 | int spares = 0; |
6727 | ||
97e4f42d N |
6728 | mddev->curr_resync_completed = 0; |
6729 | ||
159ec1fc | 6730 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6731 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6732 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6733 | (test_bit(Faulty, &rdev->flags) || |
6734 | ! test_bit(In_sync, &rdev->flags)) && | |
6735 | atomic_read(&rdev->nr_pending)==0) { | |
6736 | if (mddev->pers->hot_remove_disk( | |
6737 | mddev, rdev->raid_disk)==0) { | |
6738 | char nm[20]; | |
6739 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6740 | sysfs_remove_link(&mddev->kobj, nm); | |
6741 | rdev->raid_disk = -1; | |
6742 | } | |
6743 | } | |
6744 | ||
4044ba58 | 6745 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 6746 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6747 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6748 | !test_bit(In_sync, &rdev->flags) && |
6749 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6750 | spares++; |
b4c4c7b8 N |
6751 | if (rdev->raid_disk < 0 |
6752 | && !test_bit(Faulty, &rdev->flags)) { | |
6753 | rdev->recovery_offset = 0; | |
199050ea NB |
6754 | if (mddev->pers-> |
6755 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6756 | char nm[20]; |
6757 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6758 | if (sysfs_create_link(&mddev->kobj, |
6759 | &rdev->kobj, nm)) | |
6760 | printk(KERN_WARNING | |
6761 | "md: cannot register " | |
6762 | "%s for %s\n", | |
6763 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6764 | spares++; |
6765 | md_new_event(mddev); | |
6766 | } else | |
6767 | break; | |
6768 | } | |
dfc70645 | 6769 | } |
b4c4c7b8 N |
6770 | } |
6771 | return spares; | |
6772 | } | |
1da177e4 LT |
6773 | /* |
6774 | * This routine is regularly called by all per-raid-array threads to | |
6775 | * deal with generic issues like resync and super-block update. | |
6776 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6777 | * need this as they never do any recovery or update the superblock. | |
6778 | * | |
6779 | * It does not do any resync itself, but rather "forks" off other threads | |
6780 | * to do that as needed. | |
6781 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6782 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6783 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6784 | * and wakeups up this thread which will reap the thread and finish up. |
6785 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6786 | * | |
6787 | * The overall approach is: | |
6788 | * 1/ if the superblock needs updating, update it. | |
6789 | * 2/ If a recovery thread is running, don't do anything else. | |
6790 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6791 | * 4/ If there are any faulty devices, remove them. | |
6792 | * 5/ If array is degraded, try to add spares devices | |
6793 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6794 | */ | |
6795 | void md_check_recovery(mddev_t *mddev) | |
6796 | { | |
6797 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6798 | |
6799 | ||
5f40402d | 6800 | if (mddev->bitmap) |
aa5cbd10 | 6801 | bitmap_daemon_work(mddev); |
1da177e4 LT |
6802 | |
6803 | if (mddev->ro) | |
6804 | return; | |
fca4d848 N |
6805 | |
6806 | if (signal_pending(current)) { | |
31a59e34 | 6807 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6808 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6809 | mdname(mddev)); | |
6810 | mddev->safemode = 2; | |
6811 | } | |
6812 | flush_signals(current); | |
6813 | } | |
6814 | ||
c89a8eee N |
6815 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
6816 | return; | |
1da177e4 | 6817 | if ( ! ( |
e691063a | 6818 | (mddev->flags && !mddev->external) || |
1da177e4 | 6819 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6820 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6821 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6822 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6823 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6824 | )) |
6825 | return; | |
fca4d848 | 6826 | |
df5b89b3 | 6827 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6828 | int spares = 0; |
fca4d848 | 6829 | |
c89a8eee N |
6830 | if (mddev->ro) { |
6831 | /* Only thing we do on a ro array is remove | |
6832 | * failed devices. | |
6833 | */ | |
6834 | remove_and_add_spares(mddev); | |
6835 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6836 | goto unlock; | |
6837 | } | |
6838 | ||
31a59e34 | 6839 | if (!mddev->external) { |
0fd62b86 | 6840 | int did_change = 0; |
31a59e34 N |
6841 | spin_lock_irq(&mddev->write_lock); |
6842 | if (mddev->safemode && | |
6843 | !atomic_read(&mddev->writes_pending) && | |
6844 | !mddev->in_sync && | |
6845 | mddev->recovery_cp == MaxSector) { | |
6846 | mddev->in_sync = 1; | |
0fd62b86 | 6847 | did_change = 1; |
31a59e34 N |
6848 | if (mddev->persistent) |
6849 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6850 | } | |
6851 | if (mddev->safemode == 1) | |
6852 | mddev->safemode = 0; | |
6853 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 6854 | if (did_change) |
b62b7590 | 6855 | sysfs_notify_dirent(mddev->sysfs_state); |
fca4d848 | 6856 | } |
fca4d848 | 6857 | |
850b2b42 N |
6858 | if (mddev->flags) |
6859 | md_update_sb(mddev, 0); | |
06d91a5f | 6860 | |
159ec1fc | 6861 | list_for_each_entry(rdev, &mddev->disks, same_set) |
52664732 | 6862 | if (test_and_clear_bit(StateChanged, &rdev->flags)) |
3c0ee63a | 6863 | sysfs_notify_dirent(rdev->sysfs_state); |
52664732 | 6864 | |
06d91a5f | 6865 | |
1da177e4 LT |
6866 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6867 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6868 | /* resync/recovery still happening */ | |
6869 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6870 | goto unlock; | |
6871 | } | |
6872 | if (mddev->sync_thread) { | |
6873 | /* resync has finished, collect result */ | |
6874 | md_unregister_thread(mddev->sync_thread); | |
6875 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
6876 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
6877 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
6878 | /* success...*/ |
6879 | /* activate any spares */ | |
a99ac971 NB |
6880 | if (mddev->pers->spare_active(mddev)) |
6881 | sysfs_notify(&mddev->kobj, NULL, | |
6882 | "degraded"); | |
1da177e4 | 6883 | } |
cea9c228 N |
6884 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6885 | mddev->pers->finish_reshape) | |
6886 | mddev->pers->finish_reshape(mddev); | |
850b2b42 | 6887 | md_update_sb(mddev, 1); |
41158c7e N |
6888 | |
6889 | /* if array is no-longer degraded, then any saved_raid_disk | |
6890 | * information must be scrapped | |
6891 | */ | |
6892 | if (!mddev->degraded) | |
159ec1fc | 6893 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
6894 | rdev->saved_raid_disk = -1; |
6895 | ||
1da177e4 LT |
6896 | mddev->recovery = 0; |
6897 | /* flag recovery needed just to double check */ | |
6898 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
0c3573f1 | 6899 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6900 | md_new_event(mddev); |
1da177e4 LT |
6901 | goto unlock; |
6902 | } | |
72a23c21 NB |
6903 | /* Set RUNNING before clearing NEEDED to avoid |
6904 | * any transients in the value of "sync_action". | |
6905 | */ | |
6906 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6907 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6908 | /* Clear some bits that don't mean anything, but |
6909 | * might be left set | |
6910 | */ | |
24dd469d N |
6911 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6912 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6913 | |
5fd6c1dc N |
6914 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6915 | goto unlock; | |
1da177e4 LT |
6916 | /* no recovery is running. |
6917 | * remove any failed drives, then | |
6918 | * add spares if possible. | |
6919 | * Spare are also removed and re-added, to allow | |
6920 | * the personality to fail the re-add. | |
6921 | */ | |
1da177e4 | 6922 | |
b4c4c7b8 | 6923 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
6924 | if (mddev->pers->check_reshape == NULL || |
6925 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
6926 | /* Cannot proceed */ |
6927 | goto unlock; | |
6928 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6929 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6930 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6931 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6932 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 6933 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 6934 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6935 | } else if (mddev->recovery_cp < MaxSector) { |
6936 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6937 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6938 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6939 | /* nothing to be done ... */ | |
1da177e4 | 6940 | goto unlock; |
24dd469d | 6941 | |
1da177e4 | 6942 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6943 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6944 | /* We are adding a device or devices to an array | |
6945 | * which has the bitmap stored on all devices. | |
6946 | * So make sure all bitmap pages get written | |
6947 | */ | |
6948 | bitmap_write_all(mddev->bitmap); | |
6949 | } | |
1da177e4 LT |
6950 | mddev->sync_thread = md_register_thread(md_do_sync, |
6951 | mddev, | |
0da3c619 | 6952 | "resync"); |
1da177e4 LT |
6953 | if (!mddev->sync_thread) { |
6954 | printk(KERN_ERR "%s: could not start resync" | |
6955 | " thread...\n", | |
6956 | mdname(mddev)); | |
6957 | /* leave the spares where they are, it shouldn't hurt */ | |
6958 | mddev->recovery = 0; | |
d7603b7e | 6959 | } else |
1da177e4 | 6960 | md_wakeup_thread(mddev->sync_thread); |
0c3573f1 | 6961 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6962 | md_new_event(mddev); |
1da177e4 LT |
6963 | } |
6964 | unlock: | |
72a23c21 NB |
6965 | if (!mddev->sync_thread) { |
6966 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6967 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6968 | &mddev->recovery)) | |
0c3573f1 N |
6969 | if (mddev->sysfs_action) |
6970 | sysfs_notify_dirent(mddev->sysfs_action); | |
72a23c21 | 6971 | } |
1da177e4 LT |
6972 | mddev_unlock(mddev); |
6973 | } | |
6974 | } | |
6975 | ||
6bfe0b49 DW |
6976 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6977 | { | |
3c0ee63a | 6978 | sysfs_notify_dirent(rdev->sysfs_state); |
6bfe0b49 DW |
6979 | wait_event_timeout(rdev->blocked_wait, |
6980 | !test_bit(Blocked, &rdev->flags), | |
6981 | msecs_to_jiffies(5000)); | |
6982 | rdev_dec_pending(rdev, mddev); | |
6983 | } | |
6984 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
6985 | ||
75c96f85 AB |
6986 | static int md_notify_reboot(struct notifier_block *this, |
6987 | unsigned long code, void *x) | |
1da177e4 LT |
6988 | { |
6989 | struct list_head *tmp; | |
6990 | mddev_t *mddev; | |
6991 | ||
6992 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
6993 | ||
6994 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
6995 | ||
29ac4aa3 | 6996 | for_each_mddev(mddev, tmp) |
c71d4887 | 6997 | if (mddev_trylock(mddev)) { |
2b25000b N |
6998 | /* Force a switch to readonly even array |
6999 | * appears to still be in use. Hence | |
7000 | * the '100'. | |
7001 | */ | |
d710e138 | 7002 | do_md_stop(mddev, 1, 100); |
c71d4887 NB |
7003 | mddev_unlock(mddev); |
7004 | } | |
1da177e4 LT |
7005 | /* |
7006 | * certain more exotic SCSI devices are known to be | |
7007 | * volatile wrt too early system reboots. While the | |
7008 | * right place to handle this issue is the given | |
7009 | * driver, we do want to have a safe RAID driver ... | |
7010 | */ | |
7011 | mdelay(1000*1); | |
7012 | } | |
7013 | return NOTIFY_DONE; | |
7014 | } | |
7015 | ||
75c96f85 | 7016 | static struct notifier_block md_notifier = { |
1da177e4 LT |
7017 | .notifier_call = md_notify_reboot, |
7018 | .next = NULL, | |
7019 | .priority = INT_MAX, /* before any real devices */ | |
7020 | }; | |
7021 | ||
7022 | static void md_geninit(void) | |
7023 | { | |
1da177e4 LT |
7024 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
7025 | ||
c7705f34 | 7026 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
7027 | } |
7028 | ||
75c96f85 | 7029 | static int __init md_init(void) |
1da177e4 | 7030 | { |
3dbd8c2e | 7031 | if (register_blkdev(MD_MAJOR, "md")) |
1da177e4 LT |
7032 | return -1; |
7033 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
3dbd8c2e | 7034 | unregister_blkdev(MD_MAJOR, "md"); |
1da177e4 LT |
7035 | return -1; |
7036 | } | |
3dbd8c2e | 7037 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
7038 | md_probe, NULL, NULL); |
7039 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
7040 | md_probe, NULL, NULL); |
7041 | ||
1da177e4 | 7042 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 7043 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
7044 | |
7045 | md_geninit(); | |
d710e138 | 7046 | return 0; |
1da177e4 LT |
7047 | } |
7048 | ||
7049 | ||
7050 | #ifndef MODULE | |
7051 | ||
7052 | /* | |
7053 | * Searches all registered partitions for autorun RAID arrays | |
7054 | * at boot time. | |
7055 | */ | |
4d936ec1 ME |
7056 | |
7057 | static LIST_HEAD(all_detected_devices); | |
7058 | struct detected_devices_node { | |
7059 | struct list_head list; | |
7060 | dev_t dev; | |
7061 | }; | |
1da177e4 LT |
7062 | |
7063 | void md_autodetect_dev(dev_t dev) | |
7064 | { | |
4d936ec1 ME |
7065 | struct detected_devices_node *node_detected_dev; |
7066 | ||
7067 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
7068 | if (node_detected_dev) { | |
7069 | node_detected_dev->dev = dev; | |
7070 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
7071 | } else { | |
7072 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
7073 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
7074 | } | |
1da177e4 LT |
7075 | } |
7076 | ||
7077 | ||
7078 | static void autostart_arrays(int part) | |
7079 | { | |
7080 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
7081 | struct detected_devices_node *node_detected_dev; |
7082 | dev_t dev; | |
7083 | int i_scanned, i_passed; | |
1da177e4 | 7084 | |
4d936ec1 ME |
7085 | i_scanned = 0; |
7086 | i_passed = 0; | |
1da177e4 | 7087 | |
4d936ec1 | 7088 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 7089 | |
4d936ec1 ME |
7090 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
7091 | i_scanned++; | |
7092 | node_detected_dev = list_entry(all_detected_devices.next, | |
7093 | struct detected_devices_node, list); | |
7094 | list_del(&node_detected_dev->list); | |
7095 | dev = node_detected_dev->dev; | |
7096 | kfree(node_detected_dev); | |
df968c4e | 7097 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
7098 | if (IS_ERR(rdev)) |
7099 | continue; | |
7100 | ||
b2d444d7 | 7101 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7102 | MD_BUG(); |
7103 | continue; | |
7104 | } | |
d0fae18f | 7105 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 7106 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 7107 | i_passed++; |
1da177e4 | 7108 | } |
4d936ec1 ME |
7109 | |
7110 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
7111 | i_scanned, i_passed); | |
1da177e4 LT |
7112 | |
7113 | autorun_devices(part); | |
7114 | } | |
7115 | ||
fdee8ae4 | 7116 | #endif /* !MODULE */ |
1da177e4 LT |
7117 | |
7118 | static __exit void md_exit(void) | |
7119 | { | |
7120 | mddev_t *mddev; | |
7121 | struct list_head *tmp; | |
8ab5e4c1 | 7122 | |
3dbd8c2e | 7123 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 7124 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 7125 | |
3dbd8c2e | 7126 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
7127 | unregister_blkdev(mdp_major, "mdp"); |
7128 | unregister_reboot_notifier(&md_notifier); | |
7129 | unregister_sysctl_table(raid_table_header); | |
7130 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 7131 | for_each_mddev(mddev, tmp) { |
1da177e4 | 7132 | export_array(mddev); |
d3374825 | 7133 | mddev->hold_active = 0; |
1da177e4 LT |
7134 | } |
7135 | } | |
7136 | ||
685784aa | 7137 | subsys_initcall(md_init); |
1da177e4 LT |
7138 | module_exit(md_exit) |
7139 | ||
f91de92e N |
7140 | static int get_ro(char *buffer, struct kernel_param *kp) |
7141 | { | |
7142 | return sprintf(buffer, "%d", start_readonly); | |
7143 | } | |
7144 | static int set_ro(const char *val, struct kernel_param *kp) | |
7145 | { | |
7146 | char *e; | |
7147 | int num = simple_strtoul(val, &e, 10); | |
7148 | if (*val && (*e == '\0' || *e == '\n')) { | |
7149 | start_readonly = num; | |
4dbcdc75 | 7150 | return 0; |
f91de92e N |
7151 | } |
7152 | return -EINVAL; | |
7153 | } | |
7154 | ||
80ca3a44 N |
7155 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
7156 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 7157 | |
efeb53c0 | 7158 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 7159 | |
1da177e4 LT |
7160 | EXPORT_SYMBOL(register_md_personality); |
7161 | EXPORT_SYMBOL(unregister_md_personality); | |
7162 | EXPORT_SYMBOL(md_error); | |
7163 | EXPORT_SYMBOL(md_done_sync); | |
7164 | EXPORT_SYMBOL(md_write_start); | |
7165 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
7166 | EXPORT_SYMBOL(md_register_thread); |
7167 | EXPORT_SYMBOL(md_unregister_thread); | |
7168 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
7169 | EXPORT_SYMBOL(md_check_recovery); |
7170 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 7171 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 7172 | MODULE_ALIAS("md"); |
72008652 | 7173 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |