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Commit | Line | Data |
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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> |
aa98aa31 | 47 | #include <linux/compat.h> |
25570727 | 48 | #include <linux/delay.h> |
bff61975 N |
49 | #include <linux/raid/md_p.h> |
50 | #include <linux/raid/md_u.h> | |
43b2e5d8 | 51 | #include "md.h" |
ef740c37 | 52 | #include "bitmap.h" |
1da177e4 LT |
53 | |
54 | #define DEBUG 0 | |
55 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
56 | ||
57 | ||
58 | #ifndef MODULE | |
d710e138 | 59 | static void autostart_arrays(int part); |
1da177e4 LT |
60 | #endif |
61 | ||
2604b703 | 62 | static LIST_HEAD(pers_list); |
1da177e4 LT |
63 | static DEFINE_SPINLOCK(pers_lock); |
64 | ||
5e56341d AB |
65 | static void md_print_devices(void); |
66 | ||
90b08710 BS |
67 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
68 | ||
5e56341d AB |
69 | #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); } |
70 | ||
1e50915f RB |
71 | /* |
72 | * Default number of read corrections we'll attempt on an rdev | |
73 | * before ejecting it from the array. We divide the read error | |
74 | * count by 2 for every hour elapsed between read errors. | |
75 | */ | |
76 | #define MD_DEFAULT_MAX_CORRECTED_READ_ERRORS 20 | |
1da177e4 LT |
77 | /* |
78 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
79 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
80 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 81 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
82 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
83 | * speed limit - in case reconstruction slows down your system despite | |
84 | * idle IO detection. | |
85 | * | |
86 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
88202a0c | 87 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
88 | */ |
89 | ||
90 | static int sysctl_speed_limit_min = 1000; | |
91 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
92 | static inline int speed_min(mddev_t *mddev) |
93 | { | |
94 | return mddev->sync_speed_min ? | |
95 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
96 | } | |
97 | ||
98 | static inline int speed_max(mddev_t *mddev) | |
99 | { | |
100 | return mddev->sync_speed_max ? | |
101 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
102 | } | |
1da177e4 LT |
103 | |
104 | static struct ctl_table_header *raid_table_header; | |
105 | ||
106 | static ctl_table raid_table[] = { | |
107 | { | |
1da177e4 LT |
108 | .procname = "speed_limit_min", |
109 | .data = &sysctl_speed_limit_min, | |
110 | .maxlen = sizeof(int), | |
80ca3a44 | 111 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 112 | .proc_handler = proc_dointvec, |
1da177e4 LT |
113 | }, |
114 | { | |
1da177e4 LT |
115 | .procname = "speed_limit_max", |
116 | .data = &sysctl_speed_limit_max, | |
117 | .maxlen = sizeof(int), | |
80ca3a44 | 118 | .mode = S_IRUGO|S_IWUSR, |
6d456111 | 119 | .proc_handler = proc_dointvec, |
1da177e4 | 120 | }, |
894d2491 | 121 | { } |
1da177e4 LT |
122 | }; |
123 | ||
124 | static ctl_table raid_dir_table[] = { | |
125 | { | |
1da177e4 LT |
126 | .procname = "raid", |
127 | .maxlen = 0, | |
80ca3a44 | 128 | .mode = S_IRUGO|S_IXUGO, |
1da177e4 LT |
129 | .child = raid_table, |
130 | }, | |
894d2491 | 131 | { } |
1da177e4 LT |
132 | }; |
133 | ||
134 | static ctl_table raid_root_table[] = { | |
135 | { | |
1da177e4 LT |
136 | .procname = "dev", |
137 | .maxlen = 0, | |
138 | .mode = 0555, | |
139 | .child = raid_dir_table, | |
140 | }, | |
894d2491 | 141 | { } |
1da177e4 LT |
142 | }; |
143 | ||
83d5cde4 | 144 | static const struct block_device_operations md_fops; |
1da177e4 | 145 | |
f91de92e N |
146 | static int start_readonly; |
147 | ||
d7603b7e N |
148 | /* |
149 | * We have a system wide 'event count' that is incremented | |
150 | * on any 'interesting' event, and readers of /proc/mdstat | |
151 | * can use 'poll' or 'select' to find out when the event | |
152 | * count increases. | |
153 | * | |
154 | * Events are: | |
155 | * start array, stop array, error, add device, remove device, | |
156 | * start build, activate spare | |
157 | */ | |
2989ddbd | 158 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 159 | static atomic_t md_event_count; |
29269553 | 160 | void md_new_event(mddev_t *mddev) |
d7603b7e N |
161 | { |
162 | atomic_inc(&md_event_count); | |
163 | wake_up(&md_event_waiters); | |
164 | } | |
29269553 | 165 | EXPORT_SYMBOL_GPL(md_new_event); |
d7603b7e | 166 | |
c331eb04 N |
167 | /* Alternate version that can be called from interrupts |
168 | * when calling sysfs_notify isn't needed. | |
169 | */ | |
05381954 | 170 | static void md_new_event_inintr(mddev_t *mddev) |
c331eb04 N |
171 | { |
172 | atomic_inc(&md_event_count); | |
173 | wake_up(&md_event_waiters); | |
174 | } | |
175 | ||
1da177e4 LT |
176 | /* |
177 | * Enables to iterate over all existing md arrays | |
178 | * all_mddevs_lock protects this list. | |
179 | */ | |
180 | static LIST_HEAD(all_mddevs); | |
181 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
182 | ||
183 | ||
184 | /* | |
185 | * iterates through all used mddevs in the system. | |
186 | * We take care to grab the all_mddevs_lock whenever navigating | |
187 | * the list, and to always hold a refcount when unlocked. | |
188 | * Any code which breaks out of this loop while own | |
189 | * a reference to the current mddev and must mddev_put it. | |
190 | */ | |
29ac4aa3 | 191 | #define for_each_mddev(mddev,tmp) \ |
1da177e4 LT |
192 | \ |
193 | for (({ spin_lock(&all_mddevs_lock); \ | |
194 | tmp = all_mddevs.next; \ | |
195 | mddev = NULL;}); \ | |
196 | ({ if (tmp != &all_mddevs) \ | |
197 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
198 | spin_unlock(&all_mddevs_lock); \ | |
199 | if (mddev) mddev_put(mddev); \ | |
200 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
201 | tmp != &all_mddevs;}); \ | |
202 | ({ spin_lock(&all_mddevs_lock); \ | |
203 | tmp = tmp->next;}) \ | |
204 | ) | |
205 | ||
206 | ||
409c57f3 N |
207 | /* Rather than calling directly into the personality make_request function, |
208 | * IO requests come here first so that we can check if the device is | |
209 | * being suspended pending a reconfiguration. | |
210 | * We hold a refcount over the call to ->make_request. By the time that | |
211 | * call has finished, the bio has been linked into some internal structure | |
212 | * and so is visible to ->quiesce(), so we don't need the refcount any more. | |
213 | */ | |
214 | static int md_make_request(struct request_queue *q, struct bio *bio) | |
1da177e4 | 215 | { |
409c57f3 N |
216 | mddev_t *mddev = q->queuedata; |
217 | int rv; | |
218 | if (mddev == NULL || mddev->pers == NULL) { | |
219 | bio_io_error(bio); | |
220 | return 0; | |
221 | } | |
222 | rcu_read_lock(); | |
a2826aa9 | 223 | if (mddev->suspended || mddev->barrier) { |
409c57f3 N |
224 | DEFINE_WAIT(__wait); |
225 | for (;;) { | |
226 | prepare_to_wait(&mddev->sb_wait, &__wait, | |
227 | TASK_UNINTERRUPTIBLE); | |
a2826aa9 | 228 | if (!mddev->suspended && !mddev->barrier) |
409c57f3 N |
229 | break; |
230 | rcu_read_unlock(); | |
231 | schedule(); | |
232 | rcu_read_lock(); | |
233 | } | |
234 | finish_wait(&mddev->sb_wait, &__wait); | |
235 | } | |
236 | atomic_inc(&mddev->active_io); | |
237 | rcu_read_unlock(); | |
238 | rv = mddev->pers->make_request(q, bio); | |
239 | if (atomic_dec_and_test(&mddev->active_io) && mddev->suspended) | |
240 | wake_up(&mddev->sb_wait); | |
241 | ||
242 | return rv; | |
243 | } | |
244 | ||
245 | static void mddev_suspend(mddev_t *mddev) | |
246 | { | |
247 | BUG_ON(mddev->suspended); | |
248 | mddev->suspended = 1; | |
249 | synchronize_rcu(); | |
250 | wait_event(mddev->sb_wait, atomic_read(&mddev->active_io) == 0); | |
251 | mddev->pers->quiesce(mddev, 1); | |
252 | md_unregister_thread(mddev->thread); | |
253 | mddev->thread = NULL; | |
254 | /* we now know that no code is executing in the personality module, | |
255 | * except possibly the tail end of a ->bi_end_io function, but that | |
256 | * is certain to complete before the module has a chance to get | |
257 | * unloaded | |
258 | */ | |
259 | } | |
260 | ||
261 | static void mddev_resume(mddev_t *mddev) | |
262 | { | |
263 | mddev->suspended = 0; | |
264 | wake_up(&mddev->sb_wait); | |
265 | mddev->pers->quiesce(mddev, 0); | |
1da177e4 LT |
266 | } |
267 | ||
3fa841d7 N |
268 | int mddev_congested(mddev_t *mddev, int bits) |
269 | { | |
a2826aa9 N |
270 | if (mddev->barrier) |
271 | return 1; | |
3fa841d7 N |
272 | return mddev->suspended; |
273 | } | |
274 | EXPORT_SYMBOL(mddev_congested); | |
275 | ||
a2826aa9 N |
276 | /* |
277 | * Generic barrier handling for md | |
278 | */ | |
279 | ||
280 | #define POST_REQUEST_BARRIER ((void*)1) | |
281 | ||
282 | static void md_end_barrier(struct bio *bio, int err) | |
283 | { | |
284 | mdk_rdev_t *rdev = bio->bi_private; | |
285 | mddev_t *mddev = rdev->mddev; | |
286 | if (err == -EOPNOTSUPP && mddev->barrier != POST_REQUEST_BARRIER) | |
287 | set_bit(BIO_EOPNOTSUPP, &mddev->barrier->bi_flags); | |
288 | ||
289 | rdev_dec_pending(rdev, mddev); | |
290 | ||
291 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
292 | if (mddev->barrier == POST_REQUEST_BARRIER) { | |
293 | /* This was a post-request barrier */ | |
294 | mddev->barrier = NULL; | |
295 | wake_up(&mddev->sb_wait); | |
296 | } else | |
297 | /* The pre-request barrier has finished */ | |
298 | schedule_work(&mddev->barrier_work); | |
299 | } | |
300 | bio_put(bio); | |
301 | } | |
302 | ||
303 | static void submit_barriers(mddev_t *mddev) | |
304 | { | |
305 | mdk_rdev_t *rdev; | |
306 | ||
307 | rcu_read_lock(); | |
308 | list_for_each_entry_rcu(rdev, &mddev->disks, same_set) | |
309 | if (rdev->raid_disk >= 0 && | |
310 | !test_bit(Faulty, &rdev->flags)) { | |
311 | /* Take two references, one is dropped | |
312 | * when request finishes, one after | |
313 | * we reclaim rcu_read_lock | |
314 | */ | |
315 | struct bio *bi; | |
316 | atomic_inc(&rdev->nr_pending); | |
317 | atomic_inc(&rdev->nr_pending); | |
318 | rcu_read_unlock(); | |
319 | bi = bio_alloc(GFP_KERNEL, 0); | |
320 | bi->bi_end_io = md_end_barrier; | |
321 | bi->bi_private = rdev; | |
322 | bi->bi_bdev = rdev->bdev; | |
323 | atomic_inc(&mddev->flush_pending); | |
324 | submit_bio(WRITE_BARRIER, bi); | |
325 | rcu_read_lock(); | |
326 | rdev_dec_pending(rdev, mddev); | |
327 | } | |
328 | rcu_read_unlock(); | |
329 | } | |
330 | ||
331 | static void md_submit_barrier(struct work_struct *ws) | |
332 | { | |
333 | mddev_t *mddev = container_of(ws, mddev_t, barrier_work); | |
334 | struct bio *bio = mddev->barrier; | |
335 | ||
336 | atomic_set(&mddev->flush_pending, 1); | |
337 | ||
338 | if (test_bit(BIO_EOPNOTSUPP, &bio->bi_flags)) | |
339 | bio_endio(bio, -EOPNOTSUPP); | |
340 | else if (bio->bi_size == 0) | |
341 | /* an empty barrier - all done */ | |
342 | bio_endio(bio, 0); | |
343 | else { | |
344 | bio->bi_rw &= ~(1<<BIO_RW_BARRIER); | |
345 | if (mddev->pers->make_request(mddev->queue, bio)) | |
346 | generic_make_request(bio); | |
347 | mddev->barrier = POST_REQUEST_BARRIER; | |
348 | submit_barriers(mddev); | |
349 | } | |
350 | if (atomic_dec_and_test(&mddev->flush_pending)) { | |
351 | mddev->barrier = NULL; | |
352 | wake_up(&mddev->sb_wait); | |
353 | } | |
354 | } | |
355 | ||
356 | void md_barrier_request(mddev_t *mddev, struct bio *bio) | |
357 | { | |
358 | spin_lock_irq(&mddev->write_lock); | |
359 | wait_event_lock_irq(mddev->sb_wait, | |
360 | !mddev->barrier, | |
361 | mddev->write_lock, /*nothing*/); | |
362 | mddev->barrier = bio; | |
363 | spin_unlock_irq(&mddev->write_lock); | |
364 | ||
365 | atomic_set(&mddev->flush_pending, 1); | |
366 | INIT_WORK(&mddev->barrier_work, md_submit_barrier); | |
367 | ||
368 | submit_barriers(mddev); | |
369 | ||
370 | if (atomic_dec_and_test(&mddev->flush_pending)) | |
371 | schedule_work(&mddev->barrier_work); | |
372 | } | |
373 | EXPORT_SYMBOL(md_barrier_request); | |
409c57f3 | 374 | |
1da177e4 LT |
375 | static inline mddev_t *mddev_get(mddev_t *mddev) |
376 | { | |
377 | atomic_inc(&mddev->active); | |
378 | return mddev; | |
379 | } | |
380 | ||
5fd3a17e | 381 | static void mddev_delayed_delete(struct work_struct *ws); |
d3374825 | 382 | |
1da177e4 LT |
383 | static void mddev_put(mddev_t *mddev) |
384 | { | |
385 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
386 | return; | |
d3374825 N |
387 | if (!mddev->raid_disks && list_empty(&mddev->disks) && |
388 | !mddev->hold_active) { | |
1da177e4 | 389 | list_del(&mddev->all_mddevs); |
d3374825 N |
390 | if (mddev->gendisk) { |
391 | /* we did a probe so need to clean up. | |
392 | * Call schedule_work inside the spinlock | |
393 | * so that flush_scheduled_work() after | |
394 | * mddev_find will succeed in waiting for the | |
395 | * work to be done. | |
396 | */ | |
397 | INIT_WORK(&mddev->del_work, mddev_delayed_delete); | |
398 | schedule_work(&mddev->del_work); | |
399 | } else | |
400 | kfree(mddev); | |
401 | } | |
402 | spin_unlock(&all_mddevs_lock); | |
1da177e4 LT |
403 | } |
404 | ||
405 | static mddev_t * mddev_find(dev_t unit) | |
406 | { | |
407 | mddev_t *mddev, *new = NULL; | |
408 | ||
409 | retry: | |
410 | spin_lock(&all_mddevs_lock); | |
efeb53c0 N |
411 | |
412 | if (unit) { | |
413 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
414 | if (mddev->unit == unit) { | |
415 | mddev_get(mddev); | |
416 | spin_unlock(&all_mddevs_lock); | |
417 | kfree(new); | |
418 | return mddev; | |
419 | } | |
420 | ||
421 | if (new) { | |
422 | list_add(&new->all_mddevs, &all_mddevs); | |
1da177e4 | 423 | spin_unlock(&all_mddevs_lock); |
efeb53c0 N |
424 | new->hold_active = UNTIL_IOCTL; |
425 | return new; | |
1da177e4 | 426 | } |
efeb53c0 N |
427 | } else if (new) { |
428 | /* find an unused unit number */ | |
429 | static int next_minor = 512; | |
430 | int start = next_minor; | |
431 | int is_free = 0; | |
432 | int dev = 0; | |
433 | while (!is_free) { | |
434 | dev = MKDEV(MD_MAJOR, next_minor); | |
435 | next_minor++; | |
436 | if (next_minor > MINORMASK) | |
437 | next_minor = 0; | |
438 | if (next_minor == start) { | |
439 | /* Oh dear, all in use. */ | |
440 | spin_unlock(&all_mddevs_lock); | |
441 | kfree(new); | |
442 | return NULL; | |
443 | } | |
444 | ||
445 | is_free = 1; | |
446 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
447 | if (mddev->unit == dev) { | |
448 | is_free = 0; | |
449 | break; | |
450 | } | |
451 | } | |
452 | new->unit = dev; | |
453 | new->md_minor = MINOR(dev); | |
454 | new->hold_active = UNTIL_STOP; | |
1da177e4 LT |
455 | list_add(&new->all_mddevs, &all_mddevs); |
456 | spin_unlock(&all_mddevs_lock); | |
457 | return new; | |
458 | } | |
459 | spin_unlock(&all_mddevs_lock); | |
460 | ||
9ffae0cf | 461 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
462 | if (!new) |
463 | return NULL; | |
464 | ||
1da177e4 LT |
465 | new->unit = unit; |
466 | if (MAJOR(unit) == MD_MAJOR) | |
467 | new->md_minor = MINOR(unit); | |
468 | else | |
469 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
470 | ||
c8c00a69 | 471 | mutex_init(&new->open_mutex); |
df5b89b3 | 472 | mutex_init(&new->reconfig_mutex); |
c3d9714e | 473 | mutex_init(&new->bitmap_info.mutex); |
1da177e4 LT |
474 | INIT_LIST_HEAD(&new->disks); |
475 | INIT_LIST_HEAD(&new->all_mddevs); | |
476 | init_timer(&new->safemode_timer); | |
477 | atomic_set(&new->active, 1); | |
f2ea68cf | 478 | atomic_set(&new->openers, 0); |
409c57f3 | 479 | atomic_set(&new->active_io, 0); |
06d91a5f | 480 | spin_lock_init(&new->write_lock); |
a2826aa9 | 481 | atomic_set(&new->flush_pending, 0); |
3d310eb7 | 482 | init_waitqueue_head(&new->sb_wait); |
a6d8113a | 483 | init_waitqueue_head(&new->recovery_wait); |
08a02ecd | 484 | new->reshape_position = MaxSector; |
5e96ee65 | 485 | new->resync_min = 0; |
c6207277 | 486 | new->resync_max = MaxSector; |
d897dbf9 | 487 | new->level = LEVEL_NONE; |
1da177e4 | 488 | |
1da177e4 LT |
489 | goto retry; |
490 | } | |
491 | ||
492 | static inline int mddev_lock(mddev_t * mddev) | |
493 | { | |
df5b89b3 | 494 | return mutex_lock_interruptible(&mddev->reconfig_mutex); |
1da177e4 LT |
495 | } |
496 | ||
b522adcd DW |
497 | static inline int mddev_is_locked(mddev_t *mddev) |
498 | { | |
499 | return mutex_is_locked(&mddev->reconfig_mutex); | |
500 | } | |
501 | ||
1da177e4 LT |
502 | static inline int mddev_trylock(mddev_t * mddev) |
503 | { | |
df5b89b3 | 504 | return mutex_trylock(&mddev->reconfig_mutex); |
1da177e4 LT |
505 | } |
506 | ||
507 | static inline void mddev_unlock(mddev_t * mddev) | |
508 | { | |
df5b89b3 | 509 | mutex_unlock(&mddev->reconfig_mutex); |
1da177e4 | 510 | |
005eca5e | 511 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
512 | } |
513 | ||
2989ddbd | 514 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 | 515 | { |
159ec1fc | 516 | mdk_rdev_t *rdev; |
1da177e4 | 517 | |
159ec1fc | 518 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
519 | if (rdev->desc_nr == nr) |
520 | return rdev; | |
159ec1fc | 521 | |
1da177e4 LT |
522 | return NULL; |
523 | } | |
524 | ||
525 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
526 | { | |
1da177e4 LT |
527 | mdk_rdev_t *rdev; |
528 | ||
159ec1fc | 529 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
530 | if (rdev->bdev->bd_dev == dev) |
531 | return rdev; | |
159ec1fc | 532 | |
1da177e4 LT |
533 | return NULL; |
534 | } | |
535 | ||
d9d166c2 | 536 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
537 | { |
538 | struct mdk_personality *pers; | |
d9d166c2 N |
539 | list_for_each_entry(pers, &pers_list, list) { |
540 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 541 | return pers; |
d9d166c2 N |
542 | if (strcmp(pers->name, clevel)==0) |
543 | return pers; | |
544 | } | |
2604b703 N |
545 | return NULL; |
546 | } | |
547 | ||
b73df2d3 | 548 | /* return the offset of the super block in 512byte sectors */ |
77933d72 | 549 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 | 550 | { |
b73df2d3 AN |
551 | sector_t num_sectors = bdev->bd_inode->i_size / 512; |
552 | return MD_NEW_SIZE_SECTORS(num_sectors); | |
1da177e4 LT |
553 | } |
554 | ||
1da177e4 LT |
555 | static int alloc_disk_sb(mdk_rdev_t * rdev) |
556 | { | |
557 | if (rdev->sb_page) | |
558 | MD_BUG(); | |
559 | ||
560 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
561 | if (!rdev->sb_page) { | |
562 | printk(KERN_ALERT "md: out of memory.\n"); | |
ebc24337 | 563 | return -ENOMEM; |
1da177e4 LT |
564 | } |
565 | ||
566 | return 0; | |
567 | } | |
568 | ||
569 | static void free_disk_sb(mdk_rdev_t * rdev) | |
570 | { | |
571 | if (rdev->sb_page) { | |
2d1f3b5d | 572 | put_page(rdev->sb_page); |
1da177e4 LT |
573 | rdev->sb_loaded = 0; |
574 | rdev->sb_page = NULL; | |
0f420358 | 575 | rdev->sb_start = 0; |
dd8ac336 | 576 | rdev->sectors = 0; |
1da177e4 LT |
577 | } |
578 | } | |
579 | ||
580 | ||
6712ecf8 | 581 | static void super_written(struct bio *bio, int error) |
7bfa19f2 N |
582 | { |
583 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 584 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 | 585 | |
3a0f5bbb N |
586 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) { |
587 | printk("md: super_written gets error=%d, uptodate=%d\n", | |
588 | error, test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
589 | WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags)); | |
a9701a30 | 590 | md_error(mddev, rdev); |
3a0f5bbb | 591 | } |
7bfa19f2 | 592 | |
a9701a30 N |
593 | if (atomic_dec_and_test(&mddev->pending_writes)) |
594 | wake_up(&mddev->sb_wait); | |
f8b58edf | 595 | bio_put(bio); |
7bfa19f2 N |
596 | } |
597 | ||
6712ecf8 | 598 | static void super_written_barrier(struct bio *bio, int error) |
a9701a30 N |
599 | { |
600 | struct bio *bio2 = bio->bi_private; | |
601 | mdk_rdev_t *rdev = bio2->bi_private; | |
602 | mddev_t *mddev = rdev->mddev; | |
a9701a30 N |
603 | |
604 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
605 | error == -EOPNOTSUPP) { | |
606 | unsigned long flags; | |
607 | /* barriers don't appear to be supported :-( */ | |
608 | set_bit(BarriersNotsupp, &rdev->flags); | |
609 | mddev->barriers_work = 0; | |
610 | spin_lock_irqsave(&mddev->write_lock, flags); | |
611 | bio2->bi_next = mddev->biolist; | |
612 | mddev->biolist = bio2; | |
613 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
614 | wake_up(&mddev->sb_wait); | |
615 | bio_put(bio); | |
6712ecf8 N |
616 | } else { |
617 | bio_put(bio2); | |
618 | bio->bi_private = rdev; | |
619 | super_written(bio, error); | |
a9701a30 | 620 | } |
a9701a30 N |
621 | } |
622 | ||
7bfa19f2 N |
623 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
624 | sector_t sector, int size, struct page *page) | |
625 | { | |
626 | /* write first size bytes of page to sector of rdev | |
627 | * Increment mddev->pending_writes before returning | |
628 | * and decrement it on completion, waking up sb_wait | |
629 | * if zero is reached. | |
630 | * If an error occurred, call md_error | |
a9701a30 N |
631 | * |
632 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
633 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
634 | */ |
635 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
93dbb393 | 636 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNCIO) | (1<<BIO_RW_UNPLUG); |
7bfa19f2 N |
637 | |
638 | bio->bi_bdev = rdev->bdev; | |
639 | bio->bi_sector = sector; | |
640 | bio_add_page(bio, page, size, 0); | |
641 | bio->bi_private = rdev; | |
642 | bio->bi_end_io = super_written; | |
a9701a30 N |
643 | bio->bi_rw = rw; |
644 | ||
7bfa19f2 | 645 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
646 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
647 | struct bio *rbio; | |
648 | rw |= (1<<BIO_RW_BARRIER); | |
649 | rbio = bio_clone(bio, GFP_NOIO); | |
650 | rbio->bi_private = bio; | |
651 | rbio->bi_end_io = super_written_barrier; | |
652 | submit_bio(rw, rbio); | |
653 | } else | |
654 | submit_bio(rw, bio); | |
655 | } | |
656 | ||
657 | void md_super_wait(mddev_t *mddev) | |
658 | { | |
659 | /* wait for all superblock writes that were scheduled to complete. | |
660 | * if any had to be retried (due to BARRIER problems), retry them | |
661 | */ | |
662 | DEFINE_WAIT(wq); | |
663 | for(;;) { | |
664 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
665 | if (atomic_read(&mddev->pending_writes)==0) | |
666 | break; | |
667 | while (mddev->biolist) { | |
668 | struct bio *bio; | |
669 | spin_lock_irq(&mddev->write_lock); | |
670 | bio = mddev->biolist; | |
671 | mddev->biolist = bio->bi_next ; | |
672 | bio->bi_next = NULL; | |
673 | spin_unlock_irq(&mddev->write_lock); | |
674 | submit_bio(bio->bi_rw, bio); | |
675 | } | |
676 | schedule(); | |
677 | } | |
678 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
679 | } |
680 | ||
6712ecf8 | 681 | static void bi_complete(struct bio *bio, int error) |
1da177e4 | 682 | { |
1da177e4 | 683 | complete((struct completion*)bio->bi_private); |
1da177e4 LT |
684 | } |
685 | ||
a654b9d8 | 686 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
687 | struct page *page, int rw) |
688 | { | |
baaa2c51 | 689 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
690 | struct completion event; |
691 | int ret; | |
692 | ||
93dbb393 | 693 | rw |= (1 << BIO_RW_SYNCIO) | (1 << BIO_RW_UNPLUG); |
1da177e4 LT |
694 | |
695 | bio->bi_bdev = bdev; | |
696 | bio->bi_sector = sector; | |
697 | bio_add_page(bio, page, size, 0); | |
698 | init_completion(&event); | |
699 | bio->bi_private = &event; | |
700 | bio->bi_end_io = bi_complete; | |
701 | submit_bio(rw, bio); | |
702 | wait_for_completion(&event); | |
703 | ||
704 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
705 | bio_put(bio); | |
706 | return ret; | |
707 | } | |
a8745db2 | 708 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 709 | |
0002b271 | 710 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
711 | { |
712 | char b[BDEVNAME_SIZE]; | |
713 | if (!rdev->sb_page) { | |
714 | MD_BUG(); | |
715 | return -EINVAL; | |
716 | } | |
717 | if (rdev->sb_loaded) | |
718 | return 0; | |
719 | ||
720 | ||
0f420358 | 721 | if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ)) |
1da177e4 LT |
722 | goto fail; |
723 | rdev->sb_loaded = 1; | |
724 | return 0; | |
725 | ||
726 | fail: | |
727 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
728 | bdevname(rdev->bdev,b)); | |
729 | return -EINVAL; | |
730 | } | |
731 | ||
732 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
733 | { | |
05710466 AN |
734 | return sb1->set_uuid0 == sb2->set_uuid0 && |
735 | sb1->set_uuid1 == sb2->set_uuid1 && | |
736 | sb1->set_uuid2 == sb2->set_uuid2 && | |
737 | sb1->set_uuid3 == sb2->set_uuid3; | |
1da177e4 LT |
738 | } |
739 | ||
1da177e4 LT |
740 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) |
741 | { | |
742 | int ret; | |
743 | mdp_super_t *tmp1, *tmp2; | |
744 | ||
745 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
746 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
747 | ||
748 | if (!tmp1 || !tmp2) { | |
749 | ret = 0; | |
35020f1a | 750 | printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n"); |
1da177e4 LT |
751 | goto abort; |
752 | } | |
753 | ||
754 | *tmp1 = *sb1; | |
755 | *tmp2 = *sb2; | |
756 | ||
757 | /* | |
758 | * nr_disks is not constant | |
759 | */ | |
760 | tmp1->nr_disks = 0; | |
761 | tmp2->nr_disks = 0; | |
762 | ||
ce0c8e05 | 763 | ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0); |
1da177e4 | 764 | abort: |
990a8baf JJ |
765 | kfree(tmp1); |
766 | kfree(tmp2); | |
1da177e4 LT |
767 | return ret; |
768 | } | |
769 | ||
4d167f09 N |
770 | |
771 | static u32 md_csum_fold(u32 csum) | |
772 | { | |
773 | csum = (csum & 0xffff) + (csum >> 16); | |
774 | return (csum & 0xffff) + (csum >> 16); | |
775 | } | |
776 | ||
1da177e4 LT |
777 | static unsigned int calc_sb_csum(mdp_super_t * sb) |
778 | { | |
4d167f09 N |
779 | u64 newcsum = 0; |
780 | u32 *sb32 = (u32*)sb; | |
781 | int i; | |
1da177e4 LT |
782 | unsigned int disk_csum, csum; |
783 | ||
784 | disk_csum = sb->sb_csum; | |
785 | sb->sb_csum = 0; | |
4d167f09 N |
786 | |
787 | for (i = 0; i < MD_SB_BYTES/4 ; i++) | |
788 | newcsum += sb32[i]; | |
789 | csum = (newcsum & 0xffffffff) + (newcsum>>32); | |
790 | ||
791 | ||
792 | #ifdef CONFIG_ALPHA | |
793 | /* This used to use csum_partial, which was wrong for several | |
794 | * reasons including that different results are returned on | |
795 | * different architectures. It isn't critical that we get exactly | |
796 | * the same return value as before (we always csum_fold before | |
797 | * testing, and that removes any differences). However as we | |
798 | * know that csum_partial always returned a 16bit value on | |
799 | * alphas, do a fold to maximise conformity to previous behaviour. | |
800 | */ | |
801 | sb->sb_csum = md_csum_fold(disk_csum); | |
802 | #else | |
1da177e4 | 803 | sb->sb_csum = disk_csum; |
4d167f09 | 804 | #endif |
1da177e4 LT |
805 | return csum; |
806 | } | |
807 | ||
808 | ||
809 | /* | |
810 | * Handle superblock details. | |
811 | * We want to be able to handle multiple superblock formats | |
812 | * so we have a common interface to them all, and an array of | |
813 | * different handlers. | |
814 | * We rely on user-space to write the initial superblock, and support | |
815 | * reading and updating of superblocks. | |
816 | * Interface methods are: | |
817 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
818 | * loads and validates a superblock on dev. | |
819 | * if refdev != NULL, compare superblocks on both devices | |
820 | * Return: | |
821 | * 0 - dev has a superblock that is compatible with refdev | |
822 | * 1 - dev has a superblock that is compatible and newer than refdev | |
823 | * so dev should be used as the refdev in future | |
824 | * -EINVAL superblock incompatible or invalid | |
825 | * -othererror e.g. -EIO | |
826 | * | |
827 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
828 | * Verify that dev is acceptable into mddev. | |
829 | * The first time, mddev->raid_disks will be 0, and data from | |
830 | * dev should be merged in. Subsequent calls check that dev | |
831 | * is new enough. Return 0 or -EINVAL | |
832 | * | |
833 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
834 | * Update the superblock for rdev with data in mddev | |
835 | * This does not write to disc. | |
836 | * | |
837 | */ | |
838 | ||
839 | struct super_type { | |
0cd17fec CW |
840 | char *name; |
841 | struct module *owner; | |
842 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, | |
843 | int minor_version); | |
844 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
845 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
846 | unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev, | |
15f4a5fd | 847 | sector_t num_sectors); |
1da177e4 LT |
848 | }; |
849 | ||
0894cc30 AN |
850 | /* |
851 | * Check that the given mddev has no bitmap. | |
852 | * | |
853 | * This function is called from the run method of all personalities that do not | |
854 | * support bitmaps. It prints an error message and returns non-zero if mddev | |
855 | * has a bitmap. Otherwise, it returns 0. | |
856 | * | |
857 | */ | |
858 | int md_check_no_bitmap(mddev_t *mddev) | |
859 | { | |
c3d9714e | 860 | if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset) |
0894cc30 AN |
861 | return 0; |
862 | printk(KERN_ERR "%s: bitmaps are not supported for %s\n", | |
863 | mdname(mddev), mddev->pers->name); | |
864 | return 1; | |
865 | } | |
866 | EXPORT_SYMBOL(md_check_no_bitmap); | |
867 | ||
1da177e4 LT |
868 | /* |
869 | * load_super for 0.90.0 | |
870 | */ | |
871 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
872 | { | |
873 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
874 | mdp_super_t *sb; | |
875 | int ret; | |
1da177e4 LT |
876 | |
877 | /* | |
0f420358 | 878 | * Calculate the position of the superblock (512byte sectors), |
1da177e4 LT |
879 | * it's at the end of the disk. |
880 | * | |
881 | * It also happens to be a multiple of 4Kb. | |
882 | */ | |
0f420358 | 883 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 884 | |
0002b271 | 885 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
886 | if (ret) return ret; |
887 | ||
888 | ret = -EINVAL; | |
889 | ||
890 | bdevname(rdev->bdev, b); | |
891 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
892 | ||
893 | if (sb->md_magic != MD_SB_MAGIC) { | |
894 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
895 | b); | |
896 | goto abort; | |
897 | } | |
898 | ||
899 | if (sb->major_version != 0 || | |
f6705578 N |
900 | sb->minor_version < 90 || |
901 | sb->minor_version > 91) { | |
1da177e4 LT |
902 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", |
903 | sb->major_version, sb->minor_version, | |
904 | b); | |
905 | goto abort; | |
906 | } | |
907 | ||
908 | if (sb->raid_disks <= 0) | |
909 | goto abort; | |
910 | ||
4d167f09 | 911 | if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) { |
1da177e4 LT |
912 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", |
913 | b); | |
914 | goto abort; | |
915 | } | |
916 | ||
917 | rdev->preferred_minor = sb->md_minor; | |
918 | rdev->data_offset = 0; | |
0002b271 | 919 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
920 | |
921 | if (sb->level == LEVEL_MULTIPATH) | |
922 | rdev->desc_nr = -1; | |
923 | else | |
924 | rdev->desc_nr = sb->this_disk.number; | |
925 | ||
9a7b2b0f | 926 | if (!refdev) { |
1da177e4 | 927 | ret = 1; |
9a7b2b0f | 928 | } else { |
1da177e4 LT |
929 | __u64 ev1, ev2; |
930 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
931 | if (!uuid_equal(refsb, sb)) { | |
932 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
933 | b, bdevname(refdev->bdev,b2)); | |
934 | goto abort; | |
935 | } | |
936 | if (!sb_equal(refsb, sb)) { | |
937 | printk(KERN_WARNING "md: %s has same UUID" | |
938 | " but different superblock to %s\n", | |
939 | b, bdevname(refdev->bdev, b2)); | |
940 | goto abort; | |
941 | } | |
942 | ev1 = md_event(sb); | |
943 | ev2 = md_event(refsb); | |
944 | if (ev1 > ev2) | |
945 | ret = 1; | |
946 | else | |
947 | ret = 0; | |
948 | } | |
8190e754 | 949 | rdev->sectors = rdev->sb_start; |
1da177e4 | 950 | |
dd8ac336 | 951 | if (rdev->sectors < sb->size * 2 && sb->level > 1) |
2bf071bf N |
952 | /* "this cannot possibly happen" ... */ |
953 | ret = -EINVAL; | |
954 | ||
1da177e4 LT |
955 | abort: |
956 | return ret; | |
957 | } | |
958 | ||
959 | /* | |
960 | * validate_super for 0.90.0 | |
961 | */ | |
962 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
963 | { | |
964 | mdp_disk_t *desc; | |
965 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
07d84d10 | 966 | __u64 ev1 = md_event(sb); |
1da177e4 | 967 | |
41158c7e | 968 | rdev->raid_disk = -1; |
c5d79adb N |
969 | clear_bit(Faulty, &rdev->flags); |
970 | clear_bit(In_sync, &rdev->flags); | |
971 | clear_bit(WriteMostly, &rdev->flags); | |
972 | clear_bit(BarriersNotsupp, &rdev->flags); | |
973 | ||
1da177e4 LT |
974 | if (mddev->raid_disks == 0) { |
975 | mddev->major_version = 0; | |
976 | mddev->minor_version = sb->minor_version; | |
977 | mddev->patch_version = sb->patch_version; | |
e691063a | 978 | mddev->external = 0; |
9d8f0363 | 979 | mddev->chunk_sectors = sb->chunk_size >> 9; |
1da177e4 LT |
980 | mddev->ctime = sb->ctime; |
981 | mddev->utime = sb->utime; | |
982 | mddev->level = sb->level; | |
d9d166c2 | 983 | mddev->clevel[0] = 0; |
1da177e4 LT |
984 | mddev->layout = sb->layout; |
985 | mddev->raid_disks = sb->raid_disks; | |
58c0fed4 | 986 | mddev->dev_sectors = sb->size * 2; |
07d84d10 | 987 | mddev->events = ev1; |
c3d9714e N |
988 | mddev->bitmap_info.offset = 0; |
989 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; | |
1da177e4 | 990 | |
f6705578 N |
991 | if (mddev->minor_version >= 91) { |
992 | mddev->reshape_position = sb->reshape_position; | |
993 | mddev->delta_disks = sb->delta_disks; | |
994 | mddev->new_level = sb->new_level; | |
995 | mddev->new_layout = sb->new_layout; | |
664e7c41 | 996 | mddev->new_chunk_sectors = sb->new_chunk >> 9; |
f6705578 N |
997 | } else { |
998 | mddev->reshape_position = MaxSector; | |
999 | mddev->delta_disks = 0; | |
1000 | mddev->new_level = mddev->level; | |
1001 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1002 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1003 | } |
1004 | ||
1da177e4 LT |
1005 | if (sb->state & (1<<MD_SB_CLEAN)) |
1006 | mddev->recovery_cp = MaxSector; | |
1007 | else { | |
1008 | if (sb->events_hi == sb->cp_events_hi && | |
1009 | sb->events_lo == sb->cp_events_lo) { | |
1010 | mddev->recovery_cp = sb->recovery_cp; | |
1011 | } else | |
1012 | mddev->recovery_cp = 0; | |
1013 | } | |
1014 | ||
1015 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
1016 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
1017 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
1018 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
1019 | ||
1020 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
1021 | |
1022 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
c3d9714e N |
1023 | mddev->bitmap_info.file == NULL) |
1024 | mddev->bitmap_info.offset = | |
1025 | mddev->bitmap_info.default_offset; | |
a654b9d8 | 1026 | |
41158c7e N |
1027 | } else if (mddev->pers == NULL) { |
1028 | /* Insist on good event counter while assembling */ | |
1da177e4 LT |
1029 | ++ev1; |
1030 | if (ev1 < mddev->events) | |
1031 | return -EINVAL; | |
41158c7e N |
1032 | } else if (mddev->bitmap) { |
1033 | /* if adding to array with a bitmap, then we can accept an | |
1034 | * older device ... but not too old. | |
1035 | */ | |
41158c7e N |
1036 | if (ev1 < mddev->bitmap->events_cleared) |
1037 | return 0; | |
07d84d10 N |
1038 | } else { |
1039 | if (ev1 < mddev->events) | |
1040 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1041 | return 0; | |
1042 | } | |
41158c7e | 1043 | |
1da177e4 | 1044 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
1045 | desc = sb->disks + rdev->desc_nr; |
1046 | ||
1047 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 1048 | set_bit(Faulty, &rdev->flags); |
7c7546cc N |
1049 | else if (desc->state & (1<<MD_DISK_SYNC) /* && |
1050 | desc->raid_disk < mddev->raid_disks */) { | |
b2d444d7 | 1051 | set_bit(In_sync, &rdev->flags); |
1da177e4 | 1052 | rdev->raid_disk = desc->raid_disk; |
0261cd9f N |
1053 | } else if (desc->state & (1<<MD_DISK_ACTIVE)) { |
1054 | /* active but not in sync implies recovery up to | |
1055 | * reshape position. We don't know exactly where | |
1056 | * that is, so set to zero for now */ | |
1057 | if (mddev->minor_version >= 91) { | |
1058 | rdev->recovery_offset = 0; | |
1059 | rdev->raid_disk = desc->raid_disk; | |
1060 | } | |
1da177e4 | 1061 | } |
8ddf9efe N |
1062 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
1063 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1064 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1065 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1066 | return 0; |
1067 | } | |
1068 | ||
1069 | /* | |
1070 | * sync_super for 0.90.0 | |
1071 | */ | |
1072 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1073 | { | |
1074 | mdp_super_t *sb; | |
1da177e4 LT |
1075 | mdk_rdev_t *rdev2; |
1076 | int next_spare = mddev->raid_disks; | |
19133a42 | 1077 | |
1da177e4 LT |
1078 | |
1079 | /* make rdev->sb match mddev data.. | |
1080 | * | |
1081 | * 1/ zero out disks | |
1082 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
1083 | * 3/ any empty disks < next_spare become removed | |
1084 | * | |
1085 | * disks[0] gets initialised to REMOVED because | |
1086 | * we cannot be sure from other fields if it has | |
1087 | * been initialised or not. | |
1088 | */ | |
1089 | int i; | |
1090 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
1091 | ||
61181565 N |
1092 | rdev->sb_size = MD_SB_BYTES; |
1093 | ||
1da177e4 LT |
1094 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
1095 | ||
1096 | memset(sb, 0, sizeof(*sb)); | |
1097 | ||
1098 | sb->md_magic = MD_SB_MAGIC; | |
1099 | sb->major_version = mddev->major_version; | |
1da177e4 LT |
1100 | sb->patch_version = mddev->patch_version; |
1101 | sb->gvalid_words = 0; /* ignored */ | |
1102 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
1103 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
1104 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
1105 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
1106 | ||
1107 | sb->ctime = mddev->ctime; | |
1108 | sb->level = mddev->level; | |
58c0fed4 | 1109 | sb->size = mddev->dev_sectors / 2; |
1da177e4 LT |
1110 | sb->raid_disks = mddev->raid_disks; |
1111 | sb->md_minor = mddev->md_minor; | |
e691063a | 1112 | sb->not_persistent = 0; |
1da177e4 LT |
1113 | sb->utime = mddev->utime; |
1114 | sb->state = 0; | |
1115 | sb->events_hi = (mddev->events>>32); | |
1116 | sb->events_lo = (u32)mddev->events; | |
1117 | ||
f6705578 N |
1118 | if (mddev->reshape_position == MaxSector) |
1119 | sb->minor_version = 90; | |
1120 | else { | |
1121 | sb->minor_version = 91; | |
1122 | sb->reshape_position = mddev->reshape_position; | |
1123 | sb->new_level = mddev->new_level; | |
1124 | sb->delta_disks = mddev->delta_disks; | |
1125 | sb->new_layout = mddev->new_layout; | |
664e7c41 | 1126 | sb->new_chunk = mddev->new_chunk_sectors << 9; |
f6705578 N |
1127 | } |
1128 | mddev->minor_version = sb->minor_version; | |
1da177e4 LT |
1129 | if (mddev->in_sync) |
1130 | { | |
1131 | sb->recovery_cp = mddev->recovery_cp; | |
1132 | sb->cp_events_hi = (mddev->events>>32); | |
1133 | sb->cp_events_lo = (u32)mddev->events; | |
1134 | if (mddev->recovery_cp == MaxSector) | |
1135 | sb->state = (1<< MD_SB_CLEAN); | |
1136 | } else | |
1137 | sb->recovery_cp = 0; | |
1138 | ||
1139 | sb->layout = mddev->layout; | |
9d8f0363 | 1140 | sb->chunk_size = mddev->chunk_sectors << 9; |
1da177e4 | 1141 | |
c3d9714e | 1142 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) |
a654b9d8 N |
1143 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); |
1144 | ||
1da177e4 | 1145 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
159ec1fc | 1146 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1147 | mdp_disk_t *d; |
86e6ffdd | 1148 | int desc_nr; |
0261cd9f N |
1149 | int is_active = test_bit(In_sync, &rdev2->flags); |
1150 | ||
1151 | if (rdev2->raid_disk >= 0 && | |
1152 | sb->minor_version >= 91) | |
1153 | /* we have nowhere to store the recovery_offset, | |
1154 | * but if it is not below the reshape_position, | |
1155 | * we can piggy-back on that. | |
1156 | */ | |
1157 | is_active = 1; | |
1158 | if (rdev2->raid_disk < 0 || | |
1159 | test_bit(Faulty, &rdev2->flags)) | |
1160 | is_active = 0; | |
1161 | if (is_active) | |
86e6ffdd | 1162 | desc_nr = rdev2->raid_disk; |
1da177e4 | 1163 | else |
86e6ffdd | 1164 | desc_nr = next_spare++; |
19133a42 | 1165 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
1166 | d = &sb->disks[rdev2->desc_nr]; |
1167 | nr_disks++; | |
1168 | d->number = rdev2->desc_nr; | |
1169 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
1170 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
0261cd9f | 1171 | if (is_active) |
1da177e4 LT |
1172 | d->raid_disk = rdev2->raid_disk; |
1173 | else | |
1174 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
1be7892f | 1175 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1176 | d->state = (1<<MD_DISK_FAULTY); |
0261cd9f | 1177 | else if (is_active) { |
1da177e4 | 1178 | d->state = (1<<MD_DISK_ACTIVE); |
0261cd9f N |
1179 | if (test_bit(In_sync, &rdev2->flags)) |
1180 | d->state |= (1<<MD_DISK_SYNC); | |
1da177e4 LT |
1181 | active++; |
1182 | working++; | |
1183 | } else { | |
1184 | d->state = 0; | |
1185 | spare++; | |
1186 | working++; | |
1187 | } | |
8ddf9efe N |
1188 | if (test_bit(WriteMostly, &rdev2->flags)) |
1189 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 1190 | } |
1da177e4 LT |
1191 | /* now set the "removed" and "faulty" bits on any missing devices */ |
1192 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
1193 | mdp_disk_t *d = &sb->disks[i]; | |
1194 | if (d->state == 0 && d->number == 0) { | |
1195 | d->number = i; | |
1196 | d->raid_disk = i; | |
1197 | d->state = (1<<MD_DISK_REMOVED); | |
1198 | d->state |= (1<<MD_DISK_FAULTY); | |
1199 | failed++; | |
1200 | } | |
1201 | } | |
1202 | sb->nr_disks = nr_disks; | |
1203 | sb->active_disks = active; | |
1204 | sb->working_disks = working; | |
1205 | sb->failed_disks = failed; | |
1206 | sb->spare_disks = spare; | |
1207 | ||
1208 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
1209 | sb->sb_csum = calc_sb_csum(sb); | |
1210 | } | |
1211 | ||
0cd17fec CW |
1212 | /* |
1213 | * rdev_size_change for 0.90.0 | |
1214 | */ | |
1215 | static unsigned long long | |
15f4a5fd | 1216 | super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec | 1217 | { |
58c0fed4 | 1218 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1219 | return 0; /* component must fit device */ |
c3d9714e | 1220 | if (rdev->mddev->bitmap_info.offset) |
0cd17fec | 1221 | return 0; /* can't move bitmap */ |
0f420358 | 1222 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
15f4a5fd AN |
1223 | if (!num_sectors || num_sectors > rdev->sb_start) |
1224 | num_sectors = rdev->sb_start; | |
0f420358 | 1225 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1226 | rdev->sb_page); |
1227 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1228 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec CW |
1229 | } |
1230 | ||
1231 | ||
1da177e4 LT |
1232 | /* |
1233 | * version 1 superblock | |
1234 | */ | |
1235 | ||
1c05b4bc | 1236 | static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb) |
1da177e4 | 1237 | { |
1c05b4bc N |
1238 | __le32 disk_csum; |
1239 | u32 csum; | |
1da177e4 LT |
1240 | unsigned long long newcsum; |
1241 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
1c05b4bc | 1242 | __le32 *isuper = (__le32*)sb; |
1da177e4 LT |
1243 | int i; |
1244 | ||
1245 | disk_csum = sb->sb_csum; | |
1246 | sb->sb_csum = 0; | |
1247 | newcsum = 0; | |
1248 | for (i=0; size>=4; size -= 4 ) | |
1249 | newcsum += le32_to_cpu(*isuper++); | |
1250 | ||
1251 | if (size == 2) | |
1c05b4bc | 1252 | newcsum += le16_to_cpu(*(__le16*) isuper); |
1da177e4 LT |
1253 | |
1254 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
1255 | sb->sb_csum = disk_csum; | |
1256 | return cpu_to_le32(csum); | |
1257 | } | |
1258 | ||
1259 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
1260 | { | |
1261 | struct mdp_superblock_1 *sb; | |
1262 | int ret; | |
0f420358 | 1263 | sector_t sb_start; |
1da177e4 | 1264 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; |
0002b271 | 1265 | int bmask; |
1da177e4 LT |
1266 | |
1267 | /* | |
0f420358 | 1268 | * Calculate the position of the superblock in 512byte sectors. |
1da177e4 LT |
1269 | * It is always aligned to a 4K boundary and |
1270 | * depeding on minor_version, it can be: | |
1271 | * 0: At least 8K, but less than 12K, from end of device | |
1272 | * 1: At start of device | |
1273 | * 2: 4K from start of device. | |
1274 | */ | |
1275 | switch(minor_version) { | |
1276 | case 0: | |
0f420358 AN |
1277 | sb_start = rdev->bdev->bd_inode->i_size >> 9; |
1278 | sb_start -= 8*2; | |
1279 | sb_start &= ~(sector_t)(4*2-1); | |
1da177e4 LT |
1280 | break; |
1281 | case 1: | |
0f420358 | 1282 | sb_start = 0; |
1da177e4 LT |
1283 | break; |
1284 | case 2: | |
0f420358 | 1285 | sb_start = 8; |
1da177e4 LT |
1286 | break; |
1287 | default: | |
1288 | return -EINVAL; | |
1289 | } | |
0f420358 | 1290 | rdev->sb_start = sb_start; |
1da177e4 | 1291 | |
0002b271 N |
1292 | /* superblock is rarely larger than 1K, but it can be larger, |
1293 | * and it is safe to read 4k, so we do that | |
1294 | */ | |
1295 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
1296 | if (ret) return ret; |
1297 | ||
1298 | ||
1299 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1300 | ||
1301 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1302 | sb->major_version != cpu_to_le32(1) || | |
1303 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
0f420358 | 1304 | le64_to_cpu(sb->super_offset) != rdev->sb_start || |
71c0805c | 1305 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1306 | return -EINVAL; |
1307 | ||
1308 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1309 | printk("md: invalid superblock checksum on %s\n", | |
1310 | bdevname(rdev->bdev,b)); | |
1311 | return -EINVAL; | |
1312 | } | |
1313 | if (le64_to_cpu(sb->data_size) < 10) { | |
1314 | printk("md: data_size too small on %s\n", | |
1315 | bdevname(rdev->bdev,b)); | |
1316 | return -EINVAL; | |
1317 | } | |
e11e93fa | 1318 | |
1da177e4 LT |
1319 | rdev->preferred_minor = 0xffff; |
1320 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1321 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1322 | |
0002b271 | 1323 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
e1defc4f | 1324 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 | 1325 | if (rdev->sb_size & bmask) |
a1801f85 N |
1326 | rdev->sb_size = (rdev->sb_size | bmask) + 1; |
1327 | ||
1328 | if (minor_version | |
0f420358 | 1329 | && rdev->data_offset < sb_start + (rdev->sb_size/512)) |
a1801f85 | 1330 | return -EINVAL; |
0002b271 | 1331 | |
31b65a0d N |
1332 | if (sb->level == cpu_to_le32(LEVEL_MULTIPATH)) |
1333 | rdev->desc_nr = -1; | |
1334 | else | |
1335 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1336 | ||
9a7b2b0f | 1337 | if (!refdev) { |
8ed75463 | 1338 | ret = 1; |
9a7b2b0f | 1339 | } else { |
1da177e4 LT |
1340 | __u64 ev1, ev2; |
1341 | struct mdp_superblock_1 *refsb = | |
1342 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1343 | ||
1344 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1345 | sb->level != refsb->level || | |
1346 | sb->layout != refsb->layout || | |
1347 | sb->chunksize != refsb->chunksize) { | |
1348 | printk(KERN_WARNING "md: %s has strangely different" | |
1349 | " superblock to %s\n", | |
1350 | bdevname(rdev->bdev,b), | |
1351 | bdevname(refdev->bdev,b2)); | |
1352 | return -EINVAL; | |
1353 | } | |
1354 | ev1 = le64_to_cpu(sb->events); | |
1355 | ev2 = le64_to_cpu(refsb->events); | |
1356 | ||
1357 | if (ev1 > ev2) | |
8ed75463 N |
1358 | ret = 1; |
1359 | else | |
1360 | ret = 0; | |
1da177e4 | 1361 | } |
a1801f85 | 1362 | if (minor_version) |
dd8ac336 AN |
1363 | rdev->sectors = (rdev->bdev->bd_inode->i_size >> 9) - |
1364 | le64_to_cpu(sb->data_offset); | |
1da177e4 | 1365 | else |
dd8ac336 AN |
1366 | rdev->sectors = rdev->sb_start; |
1367 | if (rdev->sectors < le64_to_cpu(sb->data_size)) | |
1da177e4 | 1368 | return -EINVAL; |
dd8ac336 | 1369 | rdev->sectors = le64_to_cpu(sb->data_size); |
dd8ac336 | 1370 | if (le64_to_cpu(sb->size) > rdev->sectors) |
2bf071bf | 1371 | return -EINVAL; |
8ed75463 | 1372 | return ret; |
1da177e4 LT |
1373 | } |
1374 | ||
1375 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1376 | { | |
1377 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
07d84d10 | 1378 | __u64 ev1 = le64_to_cpu(sb->events); |
1da177e4 | 1379 | |
41158c7e | 1380 | rdev->raid_disk = -1; |
c5d79adb N |
1381 | clear_bit(Faulty, &rdev->flags); |
1382 | clear_bit(In_sync, &rdev->flags); | |
1383 | clear_bit(WriteMostly, &rdev->flags); | |
1384 | clear_bit(BarriersNotsupp, &rdev->flags); | |
1385 | ||
1da177e4 LT |
1386 | if (mddev->raid_disks == 0) { |
1387 | mddev->major_version = 1; | |
1388 | mddev->patch_version = 0; | |
e691063a | 1389 | mddev->external = 0; |
9d8f0363 | 1390 | mddev->chunk_sectors = le32_to_cpu(sb->chunksize); |
1da177e4 LT |
1391 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); |
1392 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1393 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1394 | mddev->clevel[0] = 0; |
1da177e4 LT |
1395 | mddev->layout = le32_to_cpu(sb->layout); |
1396 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
58c0fed4 | 1397 | mddev->dev_sectors = le64_to_cpu(sb->size); |
07d84d10 | 1398 | mddev->events = ev1; |
c3d9714e N |
1399 | mddev->bitmap_info.offset = 0; |
1400 | mddev->bitmap_info.default_offset = 1024 >> 9; | |
1da177e4 LT |
1401 | |
1402 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1403 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1404 | ||
1405 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1406 | |
71c0805c | 1407 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
c3d9714e N |
1408 | mddev->bitmap_info.file == NULL ) |
1409 | mddev->bitmap_info.offset = | |
1410 | (__s32)le32_to_cpu(sb->bitmap_offset); | |
e11e93fa | 1411 | |
f6705578 N |
1412 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) { |
1413 | mddev->reshape_position = le64_to_cpu(sb->reshape_position); | |
1414 | mddev->delta_disks = le32_to_cpu(sb->delta_disks); | |
1415 | mddev->new_level = le32_to_cpu(sb->new_level); | |
1416 | mddev->new_layout = le32_to_cpu(sb->new_layout); | |
664e7c41 | 1417 | mddev->new_chunk_sectors = le32_to_cpu(sb->new_chunk); |
f6705578 N |
1418 | } else { |
1419 | mddev->reshape_position = MaxSector; | |
1420 | mddev->delta_disks = 0; | |
1421 | mddev->new_level = mddev->level; | |
1422 | mddev->new_layout = mddev->layout; | |
664e7c41 | 1423 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
1424 | } |
1425 | ||
41158c7e N |
1426 | } else if (mddev->pers == NULL) { |
1427 | /* Insist of good event counter while assembling */ | |
1da177e4 LT |
1428 | ++ev1; |
1429 | if (ev1 < mddev->events) | |
1430 | return -EINVAL; | |
41158c7e N |
1431 | } else if (mddev->bitmap) { |
1432 | /* If adding to array with a bitmap, then we can accept an | |
1433 | * older device, but not too old. | |
1434 | */ | |
41158c7e N |
1435 | if (ev1 < mddev->bitmap->events_cleared) |
1436 | return 0; | |
07d84d10 N |
1437 | } else { |
1438 | if (ev1 < mddev->events) | |
1439 | /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1440 | return 0; | |
1441 | } | |
1da177e4 LT |
1442 | if (mddev->level != LEVEL_MULTIPATH) { |
1443 | int role; | |
3673f305 N |
1444 | if (rdev->desc_nr < 0 || |
1445 | rdev->desc_nr >= le32_to_cpu(sb->max_dev)) { | |
1446 | role = 0xffff; | |
1447 | rdev->desc_nr = -1; | |
1448 | } else | |
1449 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1da177e4 LT |
1450 | switch(role) { |
1451 | case 0xffff: /* spare */ | |
1da177e4 LT |
1452 | break; |
1453 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1454 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1455 | break; |
1456 | default: | |
5fd6c1dc N |
1457 | if ((le32_to_cpu(sb->feature_map) & |
1458 | MD_FEATURE_RECOVERY_OFFSET)) | |
1459 | rdev->recovery_offset = le64_to_cpu(sb->recovery_offset); | |
1460 | else | |
1461 | set_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
1462 | rdev->raid_disk = role; |
1463 | break; | |
1464 | } | |
8ddf9efe N |
1465 | if (sb->devflags & WriteMostly1) |
1466 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1467 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1468 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1469 | |
1da177e4 LT |
1470 | return 0; |
1471 | } | |
1472 | ||
1473 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1474 | { | |
1475 | struct mdp_superblock_1 *sb; | |
1da177e4 LT |
1476 | mdk_rdev_t *rdev2; |
1477 | int max_dev, i; | |
1478 | /* make rdev->sb match mddev and rdev data. */ | |
1479 | ||
1480 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1481 | ||
1482 | sb->feature_map = 0; | |
1483 | sb->pad0 = 0; | |
5fd6c1dc | 1484 | sb->recovery_offset = cpu_to_le64(0); |
1da177e4 LT |
1485 | memset(sb->pad1, 0, sizeof(sb->pad1)); |
1486 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1487 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1488 | ||
1489 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1490 | sb->events = cpu_to_le64(mddev->events); | |
1491 | if (mddev->in_sync) | |
1492 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1493 | else | |
1494 | sb->resync_offset = cpu_to_le64(0); | |
1495 | ||
1c05b4bc | 1496 | sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors)); |
4dbcdc75 | 1497 | |
f0ca340c | 1498 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
58c0fed4 | 1499 | sb->size = cpu_to_le64(mddev->dev_sectors); |
9d8f0363 | 1500 | sb->chunksize = cpu_to_le32(mddev->chunk_sectors); |
62e1e389 N |
1501 | sb->level = cpu_to_le32(mddev->level); |
1502 | sb->layout = cpu_to_le32(mddev->layout); | |
f0ca340c | 1503 | |
c3d9714e N |
1504 | if (mddev->bitmap && mddev->bitmap_info.file == NULL) { |
1505 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset); | |
71c0805c | 1506 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 | 1507 | } |
5fd6c1dc N |
1508 | |
1509 | if (rdev->raid_disk >= 0 && | |
97e4f42d | 1510 | !test_bit(In_sync, &rdev->flags)) { |
93be75ff N |
1511 | sb->feature_map |= |
1512 | cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET); | |
1513 | sb->recovery_offset = | |
1514 | cpu_to_le64(rdev->recovery_offset); | |
5fd6c1dc N |
1515 | } |
1516 | ||
f6705578 N |
1517 | if (mddev->reshape_position != MaxSector) { |
1518 | sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); | |
1519 | sb->reshape_position = cpu_to_le64(mddev->reshape_position); | |
1520 | sb->new_layout = cpu_to_le32(mddev->new_layout); | |
1521 | sb->delta_disks = cpu_to_le32(mddev->delta_disks); | |
1522 | sb->new_level = cpu_to_le32(mddev->new_level); | |
664e7c41 | 1523 | sb->new_chunk = cpu_to_le32(mddev->new_chunk_sectors); |
f6705578 | 1524 | } |
a654b9d8 | 1525 | |
1da177e4 | 1526 | max_dev = 0; |
159ec1fc | 1527 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
1da177e4 LT |
1528 | if (rdev2->desc_nr+1 > max_dev) |
1529 | max_dev = rdev2->desc_nr+1; | |
a778b73f | 1530 | |
70471daf N |
1531 | if (max_dev > le32_to_cpu(sb->max_dev)) { |
1532 | int bmask; | |
a778b73f | 1533 | sb->max_dev = cpu_to_le32(max_dev); |
70471daf N |
1534 | rdev->sb_size = max_dev * 2 + 256; |
1535 | bmask = queue_logical_block_size(rdev->bdev->bd_disk->queue)-1; | |
1536 | if (rdev->sb_size & bmask) | |
1537 | rdev->sb_size = (rdev->sb_size | bmask) + 1; | |
1538 | } | |
1da177e4 LT |
1539 | for (i=0; i<max_dev;i++) |
1540 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1541 | ||
159ec1fc | 1542 | list_for_each_entry(rdev2, &mddev->disks, same_set) { |
1da177e4 | 1543 | i = rdev2->desc_nr; |
b2d444d7 | 1544 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1545 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1546 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 | 1547 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
93be75ff | 1548 | else if (rdev2->raid_disk >= 0) |
5fd6c1dc | 1549 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1da177e4 LT |
1550 | else |
1551 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1552 | } | |
1553 | ||
1da177e4 LT |
1554 | sb->sb_csum = calc_sb_1_csum(sb); |
1555 | } | |
1556 | ||
0cd17fec | 1557 | static unsigned long long |
15f4a5fd | 1558 | super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) |
0cd17fec CW |
1559 | { |
1560 | struct mdp_superblock_1 *sb; | |
15f4a5fd | 1561 | sector_t max_sectors; |
58c0fed4 | 1562 | if (num_sectors && num_sectors < rdev->mddev->dev_sectors) |
0cd17fec | 1563 | return 0; /* component must fit device */ |
0f420358 | 1564 | if (rdev->sb_start < rdev->data_offset) { |
0cd17fec | 1565 | /* minor versions 1 and 2; superblock before data */ |
15f4a5fd AN |
1566 | max_sectors = rdev->bdev->bd_inode->i_size >> 9; |
1567 | max_sectors -= rdev->data_offset; | |
1568 | if (!num_sectors || num_sectors > max_sectors) | |
1569 | num_sectors = max_sectors; | |
c3d9714e | 1570 | } else if (rdev->mddev->bitmap_info.offset) { |
0cd17fec CW |
1571 | /* minor version 0 with bitmap we can't move */ |
1572 | return 0; | |
1573 | } else { | |
1574 | /* minor version 0; superblock after data */ | |
0f420358 AN |
1575 | sector_t sb_start; |
1576 | sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2; | |
1577 | sb_start &= ~(sector_t)(4*2 - 1); | |
dd8ac336 | 1578 | max_sectors = rdev->sectors + sb_start - rdev->sb_start; |
15f4a5fd AN |
1579 | if (!num_sectors || num_sectors > max_sectors) |
1580 | num_sectors = max_sectors; | |
0f420358 | 1581 | rdev->sb_start = sb_start; |
0cd17fec CW |
1582 | } |
1583 | sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page); | |
15f4a5fd | 1584 | sb->data_size = cpu_to_le64(num_sectors); |
0f420358 | 1585 | sb->super_offset = rdev->sb_start; |
0cd17fec | 1586 | sb->sb_csum = calc_sb_1_csum(sb); |
0f420358 | 1587 | md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size, |
0cd17fec CW |
1588 | rdev->sb_page); |
1589 | md_super_wait(rdev->mddev); | |
15f4a5fd | 1590 | return num_sectors / 2; /* kB for sysfs */ |
0cd17fec | 1591 | } |
1da177e4 | 1592 | |
75c96f85 | 1593 | static struct super_type super_types[] = { |
1da177e4 LT |
1594 | [0] = { |
1595 | .name = "0.90.0", | |
1596 | .owner = THIS_MODULE, | |
0cd17fec CW |
1597 | .load_super = super_90_load, |
1598 | .validate_super = super_90_validate, | |
1599 | .sync_super = super_90_sync, | |
1600 | .rdev_size_change = super_90_rdev_size_change, | |
1da177e4 LT |
1601 | }, |
1602 | [1] = { | |
1603 | .name = "md-1", | |
1604 | .owner = THIS_MODULE, | |
0cd17fec CW |
1605 | .load_super = super_1_load, |
1606 | .validate_super = super_1_validate, | |
1607 | .sync_super = super_1_sync, | |
1608 | .rdev_size_change = super_1_rdev_size_change, | |
1da177e4 LT |
1609 | }, |
1610 | }; | |
1da177e4 LT |
1611 | |
1612 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1613 | { | |
7dd5e7c3 | 1614 | mdk_rdev_t *rdev, *rdev2; |
1da177e4 | 1615 | |
4b80991c N |
1616 | rcu_read_lock(); |
1617 | rdev_for_each_rcu(rdev, mddev1) | |
1618 | rdev_for_each_rcu(rdev2, mddev2) | |
7dd5e7c3 | 1619 | if (rdev->bdev->bd_contains == |
4b80991c N |
1620 | rdev2->bdev->bd_contains) { |
1621 | rcu_read_unlock(); | |
7dd5e7c3 | 1622 | return 1; |
4b80991c N |
1623 | } |
1624 | rcu_read_unlock(); | |
1da177e4 LT |
1625 | return 0; |
1626 | } | |
1627 | ||
1628 | static LIST_HEAD(pending_raid_disks); | |
1629 | ||
ac5e7113 AN |
1630 | /* |
1631 | * Try to register data integrity profile for an mddev | |
1632 | * | |
1633 | * This is called when an array is started and after a disk has been kicked | |
1634 | * from the array. It only succeeds if all working and active component devices | |
1635 | * are integrity capable with matching profiles. | |
1636 | */ | |
1637 | int md_integrity_register(mddev_t *mddev) | |
1638 | { | |
1639 | mdk_rdev_t *rdev, *reference = NULL; | |
1640 | ||
1641 | if (list_empty(&mddev->disks)) | |
1642 | return 0; /* nothing to do */ | |
1643 | if (blk_get_integrity(mddev->gendisk)) | |
1644 | return 0; /* already registered */ | |
1645 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
1646 | /* skip spares and non-functional disks */ | |
1647 | if (test_bit(Faulty, &rdev->flags)) | |
1648 | continue; | |
1649 | if (rdev->raid_disk < 0) | |
1650 | continue; | |
1651 | /* | |
1652 | * If at least one rdev is not integrity capable, we can not | |
1653 | * enable data integrity for the md device. | |
1654 | */ | |
1655 | if (!bdev_get_integrity(rdev->bdev)) | |
1656 | return -EINVAL; | |
1657 | if (!reference) { | |
1658 | /* Use the first rdev as the reference */ | |
1659 | reference = rdev; | |
1660 | continue; | |
1661 | } | |
1662 | /* does this rdev's profile match the reference profile? */ | |
1663 | if (blk_integrity_compare(reference->bdev->bd_disk, | |
1664 | rdev->bdev->bd_disk) < 0) | |
1665 | return -EINVAL; | |
1666 | } | |
1667 | /* | |
1668 | * All component devices are integrity capable and have matching | |
1669 | * profiles, register the common profile for the md device. | |
1670 | */ | |
1671 | if (blk_integrity_register(mddev->gendisk, | |
1672 | bdev_get_integrity(reference->bdev)) != 0) { | |
1673 | printk(KERN_ERR "md: failed to register integrity for %s\n", | |
1674 | mdname(mddev)); | |
1675 | return -EINVAL; | |
1676 | } | |
1677 | printk(KERN_NOTICE "md: data integrity on %s enabled\n", | |
1678 | mdname(mddev)); | |
1679 | return 0; | |
1680 | } | |
1681 | EXPORT_SYMBOL(md_integrity_register); | |
1682 | ||
1683 | /* Disable data integrity if non-capable/non-matching disk is being added */ | |
1684 | void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev) | |
3f9d99c1 | 1685 | { |
3f9d99c1 | 1686 | struct blk_integrity *bi_rdev = bdev_get_integrity(rdev->bdev); |
ac5e7113 | 1687 | struct blk_integrity *bi_mddev = blk_get_integrity(mddev->gendisk); |
3f9d99c1 | 1688 | |
ac5e7113 | 1689 | if (!bi_mddev) /* nothing to do */ |
3f9d99c1 | 1690 | return; |
ac5e7113 | 1691 | if (rdev->raid_disk < 0) /* skip spares */ |
3f9d99c1 | 1692 | return; |
ac5e7113 AN |
1693 | if (bi_rdev && blk_integrity_compare(mddev->gendisk, |
1694 | rdev->bdev->bd_disk) >= 0) | |
1695 | return; | |
1696 | printk(KERN_NOTICE "disabling data integrity on %s\n", mdname(mddev)); | |
1697 | blk_integrity_unregister(mddev->gendisk); | |
3f9d99c1 | 1698 | } |
ac5e7113 | 1699 | EXPORT_SYMBOL(md_integrity_add_rdev); |
3f9d99c1 | 1700 | |
1da177e4 LT |
1701 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) |
1702 | { | |
7dd5e7c3 | 1703 | char b[BDEVNAME_SIZE]; |
f637b9f9 | 1704 | struct kobject *ko; |
1edf80d3 | 1705 | char *s; |
5e55e2f5 | 1706 | int err; |
1da177e4 LT |
1707 | |
1708 | if (rdev->mddev) { | |
1709 | MD_BUG(); | |
1710 | return -EINVAL; | |
1711 | } | |
11e2ede0 DW |
1712 | |
1713 | /* prevent duplicates */ | |
1714 | if (find_rdev(mddev, rdev->bdev->bd_dev)) | |
1715 | return -EEXIST; | |
1716 | ||
dd8ac336 AN |
1717 | /* make sure rdev->sectors exceeds mddev->dev_sectors */ |
1718 | if (rdev->sectors && (mddev->dev_sectors == 0 || | |
1719 | rdev->sectors < mddev->dev_sectors)) { | |
a778b73f N |
1720 | if (mddev->pers) { |
1721 | /* Cannot change size, so fail | |
1722 | * If mddev->level <= 0, then we don't care | |
1723 | * about aligning sizes (e.g. linear) | |
1724 | */ | |
1725 | if (mddev->level > 0) | |
1726 | return -ENOSPC; | |
1727 | } else | |
dd8ac336 | 1728 | mddev->dev_sectors = rdev->sectors; |
2bf071bf | 1729 | } |
1da177e4 LT |
1730 | |
1731 | /* Verify rdev->desc_nr is unique. | |
1732 | * If it is -1, assign a free number, else | |
1733 | * check number is not in use | |
1734 | */ | |
1735 | if (rdev->desc_nr < 0) { | |
1736 | int choice = 0; | |
1737 | if (mddev->pers) choice = mddev->raid_disks; | |
1738 | while (find_rdev_nr(mddev, choice)) | |
1739 | choice++; | |
1740 | rdev->desc_nr = choice; | |
1741 | } else { | |
1742 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1743 | return -EBUSY; | |
1744 | } | |
de01dfad N |
1745 | if (mddev->max_disks && rdev->desc_nr >= mddev->max_disks) { |
1746 | printk(KERN_WARNING "md: %s: array is limited to %d devices\n", | |
1747 | mdname(mddev), mddev->max_disks); | |
1748 | return -EBUSY; | |
1749 | } | |
19133a42 | 1750 | bdevname(rdev->bdev,b); |
649316b2 | 1751 | while ( (s=strchr(b, '/')) != NULL) |
1edf80d3 | 1752 | *s = '!'; |
649316b2 | 1753 | |
1da177e4 | 1754 | rdev->mddev = mddev; |
19133a42 | 1755 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1756 | |
b2d6db58 | 1757 | if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b))) |
5e55e2f5 | 1758 | goto fail; |
86e6ffdd | 1759 | |
0762b8bd | 1760 | ko = &part_to_dev(rdev->bdev->bd_part)->kobj; |
5e55e2f5 N |
1761 | if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) { |
1762 | kobject_del(&rdev->kobj); | |
1763 | goto fail; | |
1764 | } | |
3c0ee63a N |
1765 | rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state"); |
1766 | ||
4b80991c | 1767 | list_add_rcu(&rdev->same_set, &mddev->disks); |
c5d79adb | 1768 | bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk); |
4044ba58 N |
1769 | |
1770 | /* May as well allow recovery to be retried once */ | |
1771 | mddev->recovery_disabled = 0; | |
3f9d99c1 | 1772 | |
1da177e4 | 1773 | return 0; |
5e55e2f5 N |
1774 | |
1775 | fail: | |
1776 | printk(KERN_WARNING "md: failed to register dev-%s for %s\n", | |
1777 | b, mdname(mddev)); | |
1778 | return err; | |
1da177e4 LT |
1779 | } |
1780 | ||
177a99b2 | 1781 | static void md_delayed_delete(struct work_struct *ws) |
5792a285 N |
1782 | { |
1783 | mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work); | |
1784 | kobject_del(&rdev->kobj); | |
177a99b2 | 1785 | kobject_put(&rdev->kobj); |
5792a285 N |
1786 | } |
1787 | ||
1da177e4 LT |
1788 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) |
1789 | { | |
1790 | char b[BDEVNAME_SIZE]; | |
1791 | if (!rdev->mddev) { | |
1792 | MD_BUG(); | |
1793 | return; | |
1794 | } | |
5463c790 | 1795 | bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk); |
4b80991c | 1796 | list_del_rcu(&rdev->same_set); |
1da177e4 LT |
1797 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); |
1798 | rdev->mddev = NULL; | |
86e6ffdd | 1799 | sysfs_remove_link(&rdev->kobj, "block"); |
3c0ee63a N |
1800 | sysfs_put(rdev->sysfs_state); |
1801 | rdev->sysfs_state = NULL; | |
5792a285 | 1802 | /* We need to delay this, otherwise we can deadlock when |
4b80991c N |
1803 | * writing to 'remove' to "dev/state". We also need |
1804 | * to delay it due to rcu usage. | |
5792a285 | 1805 | */ |
4b80991c | 1806 | synchronize_rcu(); |
177a99b2 N |
1807 | INIT_WORK(&rdev->del_work, md_delayed_delete); |
1808 | kobject_get(&rdev->kobj); | |
5792a285 | 1809 | schedule_work(&rdev->del_work); |
1da177e4 LT |
1810 | } |
1811 | ||
1812 | /* | |
1813 | * prevent the device from being mounted, repartitioned or | |
1814 | * otherwise reused by a RAID array (or any other kernel | |
1815 | * subsystem), by bd_claiming the device. | |
1816 | */ | |
c5d79adb | 1817 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared) |
1da177e4 LT |
1818 | { |
1819 | int err = 0; | |
1820 | struct block_device *bdev; | |
1821 | char b[BDEVNAME_SIZE]; | |
1822 | ||
2e7b651d | 1823 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1824 | if (IS_ERR(bdev)) { |
1825 | printk(KERN_ERR "md: could not open %s.\n", | |
1826 | __bdevname(dev, b)); | |
1827 | return PTR_ERR(bdev); | |
1828 | } | |
c5d79adb | 1829 | err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev); |
1da177e4 LT |
1830 | if (err) { |
1831 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1832 | bdevname(bdev, b)); | |
9a1c3542 | 1833 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1834 | return err; |
1835 | } | |
c5d79adb N |
1836 | if (!shared) |
1837 | set_bit(AllReserved, &rdev->flags); | |
1da177e4 LT |
1838 | rdev->bdev = bdev; |
1839 | return err; | |
1840 | } | |
1841 | ||
1842 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1843 | { | |
1844 | struct block_device *bdev = rdev->bdev; | |
1845 | rdev->bdev = NULL; | |
1846 | if (!bdev) | |
1847 | MD_BUG(); | |
1848 | bd_release(bdev); | |
9a1c3542 | 1849 | blkdev_put(bdev, FMODE_READ|FMODE_WRITE); |
1da177e4 LT |
1850 | } |
1851 | ||
1852 | void md_autodetect_dev(dev_t dev); | |
1853 | ||
1854 | static void export_rdev(mdk_rdev_t * rdev) | |
1855 | { | |
1856 | char b[BDEVNAME_SIZE]; | |
1857 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1858 | bdevname(rdev->bdev,b)); | |
1859 | if (rdev->mddev) | |
1860 | MD_BUG(); | |
1861 | free_disk_sb(rdev); | |
1da177e4 | 1862 | #ifndef MODULE |
d0fae18f N |
1863 | if (test_bit(AutoDetected, &rdev->flags)) |
1864 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1da177e4 LT |
1865 | #endif |
1866 | unlock_rdev(rdev); | |
86e6ffdd | 1867 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1868 | } |
1869 | ||
1870 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1871 | { | |
1872 | unbind_rdev_from_array(rdev); | |
1873 | export_rdev(rdev); | |
1874 | } | |
1875 | ||
1876 | static void export_array(mddev_t *mddev) | |
1877 | { | |
159ec1fc | 1878 | mdk_rdev_t *rdev, *tmp; |
1da177e4 | 1879 | |
d089c6af | 1880 | rdev_for_each(rdev, tmp, mddev) { |
1da177e4 LT |
1881 | if (!rdev->mddev) { |
1882 | MD_BUG(); | |
1883 | continue; | |
1884 | } | |
1885 | kick_rdev_from_array(rdev); | |
1886 | } | |
1887 | if (!list_empty(&mddev->disks)) | |
1888 | MD_BUG(); | |
1889 | mddev->raid_disks = 0; | |
1890 | mddev->major_version = 0; | |
1891 | } | |
1892 | ||
1893 | static void print_desc(mdp_disk_t *desc) | |
1894 | { | |
1895 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1896 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1897 | } | |
1898 | ||
cd2ac932 | 1899 | static void print_sb_90(mdp_super_t *sb) |
1da177e4 LT |
1900 | { |
1901 | int i; | |
1902 | ||
1903 | printk(KERN_INFO | |
1904 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1905 | sb->major_version, sb->minor_version, sb->patch_version, | |
1906 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1907 | sb->ctime); | |
1908 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1909 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1910 | sb->md_minor, sb->layout, sb->chunk_size); | |
1911 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1912 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1913 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1914 | sb->failed_disks, sb->spare_disks, | |
1915 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1916 | ||
1917 | printk(KERN_INFO); | |
1918 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1919 | mdp_disk_t *desc; | |
1920 | ||
1921 | desc = sb->disks + i; | |
1922 | if (desc->number || desc->major || desc->minor || | |
1923 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1924 | printk(" D %2d: ", i); | |
1925 | print_desc(desc); | |
1926 | } | |
1927 | } | |
1928 | printk(KERN_INFO "md: THIS: "); | |
1929 | print_desc(&sb->this_disk); | |
cd2ac932 | 1930 | } |
1da177e4 | 1931 | |
cd2ac932 CR |
1932 | static void print_sb_1(struct mdp_superblock_1 *sb) |
1933 | { | |
1934 | __u8 *uuid; | |
1935 | ||
1936 | uuid = sb->set_uuid; | |
ad361c98 JP |
1937 | printk(KERN_INFO |
1938 | "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x" | |
1939 | ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n" | |
1940 | "md: Name: \"%s\" CT:%llu\n", | |
cd2ac932 CR |
1941 | le32_to_cpu(sb->major_version), |
1942 | le32_to_cpu(sb->feature_map), | |
1943 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1944 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1945 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1946 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1947 | sb->set_name, | |
1948 | (unsigned long long)le64_to_cpu(sb->ctime) | |
1949 | & MD_SUPERBLOCK_1_TIME_SEC_MASK); | |
1950 | ||
1951 | uuid = sb->device_uuid; | |
ad361c98 JP |
1952 | printk(KERN_INFO |
1953 | "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu" | |
cd2ac932 | 1954 | " RO:%llu\n" |
ad361c98 JP |
1955 | "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x" |
1956 | ":%02x%02x%02x%02x%02x%02x\n" | |
1957 | "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n" | |
1958 | "md: (MaxDev:%u) \n", | |
cd2ac932 CR |
1959 | le32_to_cpu(sb->level), |
1960 | (unsigned long long)le64_to_cpu(sb->size), | |
1961 | le32_to_cpu(sb->raid_disks), | |
1962 | le32_to_cpu(sb->layout), | |
1963 | le32_to_cpu(sb->chunksize), | |
1964 | (unsigned long long)le64_to_cpu(sb->data_offset), | |
1965 | (unsigned long long)le64_to_cpu(sb->data_size), | |
1966 | (unsigned long long)le64_to_cpu(sb->super_offset), | |
1967 | (unsigned long long)le64_to_cpu(sb->recovery_offset), | |
1968 | le32_to_cpu(sb->dev_number), | |
1969 | uuid[0], uuid[1], uuid[2], uuid[3], | |
1970 | uuid[4], uuid[5], uuid[6], uuid[7], | |
1971 | uuid[8], uuid[9], uuid[10], uuid[11], | |
1972 | uuid[12], uuid[13], uuid[14], uuid[15], | |
1973 | sb->devflags, | |
1974 | (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK, | |
1975 | (unsigned long long)le64_to_cpu(sb->events), | |
1976 | (unsigned long long)le64_to_cpu(sb->resync_offset), | |
1977 | le32_to_cpu(sb->sb_csum), | |
1978 | le32_to_cpu(sb->max_dev) | |
1979 | ); | |
1da177e4 LT |
1980 | } |
1981 | ||
cd2ac932 | 1982 | static void print_rdev(mdk_rdev_t *rdev, int major_version) |
1da177e4 LT |
1983 | { |
1984 | char b[BDEVNAME_SIZE]; | |
dd8ac336 AN |
1985 | printk(KERN_INFO "md: rdev %s, Sect:%08llu F:%d S:%d DN:%u\n", |
1986 | bdevname(rdev->bdev, b), (unsigned long long)rdev->sectors, | |
b2d444d7 N |
1987 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1988 | rdev->desc_nr); | |
1da177e4 | 1989 | if (rdev->sb_loaded) { |
cd2ac932 CR |
1990 | printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version); |
1991 | switch (major_version) { | |
1992 | case 0: | |
1993 | print_sb_90((mdp_super_t*)page_address(rdev->sb_page)); | |
1994 | break; | |
1995 | case 1: | |
1996 | print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page)); | |
1997 | break; | |
1998 | } | |
1da177e4 LT |
1999 | } else |
2000 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
2001 | } | |
2002 | ||
5e56341d | 2003 | static void md_print_devices(void) |
1da177e4 | 2004 | { |
159ec1fc | 2005 | struct list_head *tmp; |
1da177e4 LT |
2006 | mdk_rdev_t *rdev; |
2007 | mddev_t *mddev; | |
2008 | char b[BDEVNAME_SIZE]; | |
2009 | ||
2010 | printk("\n"); | |
2011 | printk("md: **********************************\n"); | |
2012 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
2013 | printk("md: **********************************\n"); | |
29ac4aa3 | 2014 | for_each_mddev(mddev, tmp) { |
1da177e4 | 2015 | |
32a7627c N |
2016 | if (mddev->bitmap) |
2017 | bitmap_print_sb(mddev->bitmap); | |
2018 | else | |
2019 | printk("%s: ", mdname(mddev)); | |
159ec1fc | 2020 | list_for_each_entry(rdev, &mddev->disks, same_set) |
1da177e4 LT |
2021 | printk("<%s>", bdevname(rdev->bdev,b)); |
2022 | printk("\n"); | |
2023 | ||
159ec1fc | 2024 | list_for_each_entry(rdev, &mddev->disks, same_set) |
cd2ac932 | 2025 | print_rdev(rdev, mddev->major_version); |
1da177e4 LT |
2026 | } |
2027 | printk("md: **********************************\n"); | |
2028 | printk("\n"); | |
2029 | } | |
2030 | ||
2031 | ||
42543769 | 2032 | static void sync_sbs(mddev_t * mddev, int nospares) |
1da177e4 | 2033 | { |
42543769 N |
2034 | /* Update each superblock (in-memory image), but |
2035 | * if we are allowed to, skip spares which already | |
2036 | * have the right event counter, or have one earlier | |
2037 | * (which would mean they aren't being marked as dirty | |
2038 | * with the rest of the array) | |
2039 | */ | |
1da177e4 | 2040 | mdk_rdev_t *rdev; |
1da177e4 | 2041 | |
5e865106 N |
2042 | /* First make sure individual recovery_offsets are correct */ |
2043 | list_for_each_entry(rdev, &mddev->disks, same_set) { | |
2044 | if (rdev->raid_disk >= 0 && | |
2045 | !test_bit(In_sync, &rdev->flags) && | |
2046 | mddev->curr_resync_completed > rdev->recovery_offset) | |
2047 | rdev->recovery_offset = mddev->curr_resync_completed; | |
2048 | ||
2049 | } | |
159ec1fc | 2050 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
42543769 N |
2051 | if (rdev->sb_events == mddev->events || |
2052 | (nospares && | |
2053 | rdev->raid_disk < 0 && | |
2054 | (rdev->sb_events&1)==0 && | |
2055 | rdev->sb_events+1 == mddev->events)) { | |
2056 | /* Don't update this superblock */ | |
2057 | rdev->sb_loaded = 2; | |
2058 | } else { | |
2059 | super_types[mddev->major_version]. | |
2060 | sync_super(mddev, rdev); | |
2061 | rdev->sb_loaded = 1; | |
2062 | } | |
1da177e4 LT |
2063 | } |
2064 | } | |
2065 | ||
850b2b42 | 2066 | static void md_update_sb(mddev_t * mddev, int force_change) |
1da177e4 | 2067 | { |
1da177e4 | 2068 | mdk_rdev_t *rdev; |
06d91a5f | 2069 | int sync_req; |
42543769 | 2070 | int nospares = 0; |
1da177e4 | 2071 | |
1b57f132 | 2072 | mddev->utime = get_seconds(); |
8377bc80 N |
2073 | if (mddev->external) |
2074 | return; | |
1da177e4 | 2075 | repeat: |
a9701a30 | 2076 | spin_lock_irq(&mddev->write_lock); |
84692195 | 2077 | |
850b2b42 N |
2078 | set_bit(MD_CHANGE_PENDING, &mddev->flags); |
2079 | if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags)) | |
2080 | force_change = 1; | |
2081 | if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
2082 | /* just a clean<-> dirty transition, possibly leave spares alone, | |
2083 | * though if events isn't the right even/odd, we will have to do | |
2084 | * spares after all | |
2085 | */ | |
2086 | nospares = 1; | |
2087 | if (force_change) | |
2088 | nospares = 0; | |
2089 | if (mddev->degraded) | |
84692195 N |
2090 | /* If the array is degraded, then skipping spares is both |
2091 | * dangerous and fairly pointless. | |
2092 | * Dangerous because a device that was removed from the array | |
2093 | * might have a event_count that still looks up-to-date, | |
2094 | * so it can be re-added without a resync. | |
2095 | * Pointless because if there are any spares to skip, | |
2096 | * then a recovery will happen and soon that array won't | |
2097 | * be degraded any more and the spare can go back to sleep then. | |
2098 | */ | |
850b2b42 | 2099 | nospares = 0; |
84692195 | 2100 | |
06d91a5f | 2101 | sync_req = mddev->in_sync; |
42543769 N |
2102 | |
2103 | /* If this is just a dirty<->clean transition, and the array is clean | |
2104 | * and 'events' is odd, we can roll back to the previous clean state */ | |
850b2b42 | 2105 | if (nospares |
42543769 | 2106 | && (mddev->in_sync && mddev->recovery_cp == MaxSector) |
1031be7a N |
2107 | && (mddev->events & 1) |
2108 | && mddev->events != 1) | |
42543769 N |
2109 | mddev->events--; |
2110 | else { | |
2111 | /* otherwise we have to go forward and ... */ | |
2112 | mddev->events ++; | |
2113 | if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */ | |
51d5668c N |
2114 | /* .. if the array isn't clean, an 'even' event must also go |
2115 | * to spares. */ | |
2116 | if ((mddev->events&1)==0) | |
42543769 | 2117 | nospares = 0; |
42543769 | 2118 | } else { |
51d5668c N |
2119 | /* otherwise an 'odd' event must go to spares */ |
2120 | if ((mddev->events&1)) | |
42543769 | 2121 | nospares = 0; |
42543769 N |
2122 | } |
2123 | } | |
1da177e4 LT |
2124 | |
2125 | if (!mddev->events) { | |
2126 | /* | |
2127 | * oops, this 64-bit counter should never wrap. | |
2128 | * Either we are in around ~1 trillion A.C., assuming | |
2129 | * 1 reboot per second, or we have a bug: | |
2130 | */ | |
2131 | MD_BUG(); | |
2132 | mddev->events --; | |
2133 | } | |
1da177e4 LT |
2134 | |
2135 | /* | |
2136 | * do not write anything to disk if using | |
2137 | * nonpersistent superblocks | |
2138 | */ | |
06d91a5f | 2139 | if (!mddev->persistent) { |
e691063a N |
2140 | if (!mddev->external) |
2141 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); | |
2142 | ||
a9701a30 | 2143 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2144 | wake_up(&mddev->sb_wait); |
1da177e4 | 2145 | return; |
06d91a5f | 2146 | } |
e691063a | 2147 | sync_sbs(mddev, nospares); |
a9701a30 | 2148 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
2149 | |
2150 | dprintk(KERN_INFO | |
2151 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
2152 | mdname(mddev),mddev->in_sync); | |
2153 | ||
4ad13663 | 2154 | bitmap_update_sb(mddev->bitmap); |
159ec1fc | 2155 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
2156 | char b[BDEVNAME_SIZE]; |
2157 | dprintk(KERN_INFO "md: "); | |
42543769 N |
2158 | if (rdev->sb_loaded != 1) |
2159 | continue; /* no noise on spare devices */ | |
b2d444d7 | 2160 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2161 | dprintk("(skipping faulty "); |
2162 | ||
2163 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 2164 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 2165 | md_super_write(mddev,rdev, |
0f420358 | 2166 | rdev->sb_start, rdev->sb_size, |
7bfa19f2 N |
2167 | rdev->sb_page); |
2168 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
2169 | bdevname(rdev->bdev,b), | |
0f420358 | 2170 | (unsigned long long)rdev->sb_start); |
42543769 | 2171 | rdev->sb_events = mddev->events; |
7bfa19f2 | 2172 | |
1da177e4 LT |
2173 | } else |
2174 | dprintk(")\n"); | |
7bfa19f2 | 2175 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
2176 | /* only need to write one superblock... */ |
2177 | break; | |
2178 | } | |
a9701a30 | 2179 | md_super_wait(mddev); |
850b2b42 | 2180 | /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */ |
7bfa19f2 | 2181 | |
a9701a30 | 2182 | spin_lock_irq(&mddev->write_lock); |
850b2b42 N |
2183 | if (mddev->in_sync != sync_req || |
2184 | test_bit(MD_CHANGE_DEVS, &mddev->flags)) { | |
06d91a5f | 2185 | /* have to write it out again */ |
a9701a30 | 2186 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
2187 | goto repeat; |
2188 | } | |
850b2b42 | 2189 | clear_bit(MD_CHANGE_PENDING, &mddev->flags); |
a9701a30 | 2190 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 2191 | wake_up(&mddev->sb_wait); |
acb180b0 N |
2192 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
2193 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); | |
06d91a5f | 2194 | |
1da177e4 LT |
2195 | } |
2196 | ||
7f6ce769 | 2197 | /* words written to sysfs files may, or may not, be \n terminated. |
bce74dac N |
2198 | * We want to accept with case. For this we use cmd_match. |
2199 | */ | |
2200 | static int cmd_match(const char *cmd, const char *str) | |
2201 | { | |
2202 | /* See if cmd, written into a sysfs file, matches | |
2203 | * str. They must either be the same, or cmd can | |
2204 | * have a trailing newline | |
2205 | */ | |
2206 | while (*cmd && *str && *cmd == *str) { | |
2207 | cmd++; | |
2208 | str++; | |
2209 | } | |
2210 | if (*cmd == '\n') | |
2211 | cmd++; | |
2212 | if (*str || *cmd) | |
2213 | return 0; | |
2214 | return 1; | |
2215 | } | |
2216 | ||
86e6ffdd N |
2217 | struct rdev_sysfs_entry { |
2218 | struct attribute attr; | |
2219 | ssize_t (*show)(mdk_rdev_t *, char *); | |
2220 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
2221 | }; | |
2222 | ||
2223 | static ssize_t | |
96de1e66 | 2224 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
2225 | { |
2226 | char *sep = ""; | |
20a49ff6 | 2227 | size_t len = 0; |
86e6ffdd | 2228 | |
b2d444d7 | 2229 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
2230 | len+= sprintf(page+len, "%sfaulty",sep); |
2231 | sep = ","; | |
2232 | } | |
b2d444d7 | 2233 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
2234 | len += sprintf(page+len, "%sin_sync",sep); |
2235 | sep = ","; | |
2236 | } | |
f655675b N |
2237 | if (test_bit(WriteMostly, &rdev->flags)) { |
2238 | len += sprintf(page+len, "%swrite_mostly",sep); | |
2239 | sep = ","; | |
2240 | } | |
6bfe0b49 DW |
2241 | if (test_bit(Blocked, &rdev->flags)) { |
2242 | len += sprintf(page+len, "%sblocked", sep); | |
2243 | sep = ","; | |
2244 | } | |
b2d444d7 N |
2245 | if (!test_bit(Faulty, &rdev->flags) && |
2246 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
2247 | len += sprintf(page+len, "%sspare", sep); |
2248 | sep = ","; | |
2249 | } | |
2250 | return len+sprintf(page+len, "\n"); | |
2251 | } | |
2252 | ||
45dc2de1 N |
2253 | static ssize_t |
2254 | state_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2255 | { | |
2256 | /* can write | |
2257 | * faulty - simulates and error | |
2258 | * remove - disconnects the device | |
f655675b N |
2259 | * writemostly - sets write_mostly |
2260 | * -writemostly - clears write_mostly | |
6bfe0b49 DW |
2261 | * blocked - sets the Blocked flag |
2262 | * -blocked - clears the Blocked flag | |
6d56e278 | 2263 | * insync - sets Insync providing device isn't active |
45dc2de1 N |
2264 | */ |
2265 | int err = -EINVAL; | |
2266 | if (cmd_match(buf, "faulty") && rdev->mddev->pers) { | |
2267 | md_error(rdev->mddev, rdev); | |
2268 | err = 0; | |
2269 | } else if (cmd_match(buf, "remove")) { | |
2270 | if (rdev->raid_disk >= 0) | |
2271 | err = -EBUSY; | |
2272 | else { | |
2273 | mddev_t *mddev = rdev->mddev; | |
2274 | kick_rdev_from_array(rdev); | |
3f9d7b0d N |
2275 | if (mddev->pers) |
2276 | md_update_sb(mddev, 1); | |
45dc2de1 N |
2277 | md_new_event(mddev); |
2278 | err = 0; | |
2279 | } | |
f655675b N |
2280 | } else if (cmd_match(buf, "writemostly")) { |
2281 | set_bit(WriteMostly, &rdev->flags); | |
2282 | err = 0; | |
2283 | } else if (cmd_match(buf, "-writemostly")) { | |
2284 | clear_bit(WriteMostly, &rdev->flags); | |
6bfe0b49 DW |
2285 | err = 0; |
2286 | } else if (cmd_match(buf, "blocked")) { | |
2287 | set_bit(Blocked, &rdev->flags); | |
2288 | err = 0; | |
2289 | } else if (cmd_match(buf, "-blocked")) { | |
2290 | clear_bit(Blocked, &rdev->flags); | |
2291 | wake_up(&rdev->blocked_wait); | |
2292 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2293 | md_wakeup_thread(rdev->mddev->thread); | |
2294 | ||
6d56e278 N |
2295 | err = 0; |
2296 | } else if (cmd_match(buf, "insync") && rdev->raid_disk == -1) { | |
2297 | set_bit(In_sync, &rdev->flags); | |
f655675b | 2298 | err = 0; |
45dc2de1 | 2299 | } |
3c0ee63a N |
2300 | if (!err && rdev->sysfs_state) |
2301 | sysfs_notify_dirent(rdev->sysfs_state); | |
45dc2de1 N |
2302 | return err ? err : len; |
2303 | } | |
80ca3a44 N |
2304 | static struct rdev_sysfs_entry rdev_state = |
2305 | __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store); | |
86e6ffdd | 2306 | |
4dbcdc75 N |
2307 | static ssize_t |
2308 | errors_show(mdk_rdev_t *rdev, char *page) | |
2309 | { | |
2310 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
2311 | } | |
2312 | ||
2313 | static ssize_t | |
2314 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2315 | { | |
2316 | char *e; | |
2317 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2318 | if (*buf && (*e == 0 || *e == '\n')) { | |
2319 | atomic_set(&rdev->corrected_errors, n); | |
2320 | return len; | |
2321 | } | |
2322 | return -EINVAL; | |
2323 | } | |
2324 | static struct rdev_sysfs_entry rdev_errors = | |
80ca3a44 | 2325 | __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store); |
4dbcdc75 | 2326 | |
014236d2 N |
2327 | static ssize_t |
2328 | slot_show(mdk_rdev_t *rdev, char *page) | |
2329 | { | |
2330 | if (rdev->raid_disk < 0) | |
2331 | return sprintf(page, "none\n"); | |
2332 | else | |
2333 | return sprintf(page, "%d\n", rdev->raid_disk); | |
2334 | } | |
2335 | ||
2336 | static ssize_t | |
2337 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2338 | { | |
2339 | char *e; | |
c303da6d N |
2340 | int err; |
2341 | char nm[20]; | |
014236d2 N |
2342 | int slot = simple_strtoul(buf, &e, 10); |
2343 | if (strncmp(buf, "none", 4)==0) | |
2344 | slot = -1; | |
2345 | else if (e==buf || (*e && *e!= '\n')) | |
2346 | return -EINVAL; | |
6c2fce2e | 2347 | if (rdev->mddev->pers && slot == -1) { |
c303da6d N |
2348 | /* Setting 'slot' on an active array requires also |
2349 | * updating the 'rd%d' link, and communicating | |
2350 | * with the personality with ->hot_*_disk. | |
2351 | * For now we only support removing | |
2352 | * failed/spare devices. This normally happens automatically, | |
2353 | * but not when the metadata is externally managed. | |
2354 | */ | |
c303da6d N |
2355 | if (rdev->raid_disk == -1) |
2356 | return -EEXIST; | |
2357 | /* personality does all needed checks */ | |
2358 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2359 | return -EINVAL; | |
2360 | err = rdev->mddev->pers-> | |
2361 | hot_remove_disk(rdev->mddev, rdev->raid_disk); | |
2362 | if (err) | |
2363 | return err; | |
2364 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2365 | sysfs_remove_link(&rdev->mddev->kobj, nm); | |
2366 | set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); | |
2367 | md_wakeup_thread(rdev->mddev->thread); | |
6c2fce2e NB |
2368 | } else if (rdev->mddev->pers) { |
2369 | mdk_rdev_t *rdev2; | |
6c2fce2e | 2370 | /* Activating a spare .. or possibly reactivating |
6d56e278 | 2371 | * if we ever get bitmaps working here. |
6c2fce2e NB |
2372 | */ |
2373 | ||
2374 | if (rdev->raid_disk != -1) | |
2375 | return -EBUSY; | |
2376 | ||
2377 | if (rdev->mddev->pers->hot_add_disk == NULL) | |
2378 | return -EINVAL; | |
2379 | ||
159ec1fc | 2380 | list_for_each_entry(rdev2, &rdev->mddev->disks, same_set) |
6c2fce2e NB |
2381 | if (rdev2->raid_disk == slot) |
2382 | return -EEXIST; | |
2383 | ||
2384 | rdev->raid_disk = slot; | |
2385 | if (test_bit(In_sync, &rdev->flags)) | |
2386 | rdev->saved_raid_disk = slot; | |
2387 | else | |
2388 | rdev->saved_raid_disk = -1; | |
2389 | err = rdev->mddev->pers-> | |
2390 | hot_add_disk(rdev->mddev, rdev); | |
199050ea | 2391 | if (err) { |
6c2fce2e | 2392 | rdev->raid_disk = -1; |
6c2fce2e | 2393 | return err; |
52664732 | 2394 | } else |
3c0ee63a | 2395 | sysfs_notify_dirent(rdev->sysfs_state); |
6c2fce2e NB |
2396 | sprintf(nm, "rd%d", rdev->raid_disk); |
2397 | if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm)) | |
2398 | printk(KERN_WARNING | |
2399 | "md: cannot register " | |
2400 | "%s for %s\n", | |
2401 | nm, mdname(rdev->mddev)); | |
2402 | ||
2403 | /* don't wakeup anyone, leave that to userspace. */ | |
c303da6d N |
2404 | } else { |
2405 | if (slot >= rdev->mddev->raid_disks) | |
2406 | return -ENOSPC; | |
2407 | rdev->raid_disk = slot; | |
2408 | /* assume it is working */ | |
c5d79adb N |
2409 | clear_bit(Faulty, &rdev->flags); |
2410 | clear_bit(WriteMostly, &rdev->flags); | |
c303da6d | 2411 | set_bit(In_sync, &rdev->flags); |
3c0ee63a | 2412 | sysfs_notify_dirent(rdev->sysfs_state); |
c303da6d | 2413 | } |
014236d2 N |
2414 | return len; |
2415 | } | |
2416 | ||
2417 | ||
2418 | static struct rdev_sysfs_entry rdev_slot = | |
80ca3a44 | 2419 | __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store); |
014236d2 | 2420 | |
93c8cad0 N |
2421 | static ssize_t |
2422 | offset_show(mdk_rdev_t *rdev, char *page) | |
2423 | { | |
6961ece4 | 2424 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
2425 | } |
2426 | ||
2427 | static ssize_t | |
2428 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2429 | { | |
2430 | char *e; | |
2431 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
2432 | if (e==buf || (*e && *e != '\n')) | |
2433 | return -EINVAL; | |
8ed0a521 | 2434 | if (rdev->mddev->pers && rdev->raid_disk >= 0) |
93c8cad0 | 2435 | return -EBUSY; |
dd8ac336 | 2436 | if (rdev->sectors && rdev->mddev->external) |
c5d79adb N |
2437 | /* Must set offset before size, so overlap checks |
2438 | * can be sane */ | |
2439 | return -EBUSY; | |
93c8cad0 N |
2440 | rdev->data_offset = offset; |
2441 | return len; | |
2442 | } | |
2443 | ||
2444 | static struct rdev_sysfs_entry rdev_offset = | |
80ca3a44 | 2445 | __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store); |
93c8cad0 | 2446 | |
83303b61 N |
2447 | static ssize_t |
2448 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
2449 | { | |
dd8ac336 | 2450 | return sprintf(page, "%llu\n", (unsigned long long)rdev->sectors / 2); |
83303b61 N |
2451 | } |
2452 | ||
c5d79adb N |
2453 | static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2) |
2454 | { | |
2455 | /* check if two start/length pairs overlap */ | |
2456 | if (s1+l1 <= s2) | |
2457 | return 0; | |
2458 | if (s2+l2 <= s1) | |
2459 | return 0; | |
2460 | return 1; | |
2461 | } | |
2462 | ||
b522adcd DW |
2463 | static int strict_blocks_to_sectors(const char *buf, sector_t *sectors) |
2464 | { | |
2465 | unsigned long long blocks; | |
2466 | sector_t new; | |
2467 | ||
2468 | if (strict_strtoull(buf, 10, &blocks) < 0) | |
2469 | return -EINVAL; | |
2470 | ||
2471 | if (blocks & 1ULL << (8 * sizeof(blocks) - 1)) | |
2472 | return -EINVAL; /* sector conversion overflow */ | |
2473 | ||
2474 | new = blocks * 2; | |
2475 | if (new != blocks * 2) | |
2476 | return -EINVAL; /* unsigned long long to sector_t overflow */ | |
2477 | ||
2478 | *sectors = new; | |
2479 | return 0; | |
2480 | } | |
2481 | ||
83303b61 N |
2482 | static ssize_t |
2483 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
2484 | { | |
27c529bb | 2485 | mddev_t *my_mddev = rdev->mddev; |
dd8ac336 | 2486 | sector_t oldsectors = rdev->sectors; |
b522adcd | 2487 | sector_t sectors; |
27c529bb | 2488 | |
b522adcd | 2489 | if (strict_blocks_to_sectors(buf, §ors) < 0) |
d7027458 | 2490 | return -EINVAL; |
0cd17fec | 2491 | if (my_mddev->pers && rdev->raid_disk >= 0) { |
d7027458 | 2492 | if (my_mddev->persistent) { |
dd8ac336 AN |
2493 | sectors = super_types[my_mddev->major_version]. |
2494 | rdev_size_change(rdev, sectors); | |
2495 | if (!sectors) | |
0cd17fec | 2496 | return -EBUSY; |
dd8ac336 AN |
2497 | } else if (!sectors) |
2498 | sectors = (rdev->bdev->bd_inode->i_size >> 9) - | |
2499 | rdev->data_offset; | |
0cd17fec | 2500 | } |
dd8ac336 | 2501 | if (sectors < my_mddev->dev_sectors) |
7d3c6f87 | 2502 | return -EINVAL; /* component must fit device */ |
0cd17fec | 2503 | |
dd8ac336 AN |
2504 | rdev->sectors = sectors; |
2505 | if (sectors > oldsectors && my_mddev->external) { | |
c5d79adb N |
2506 | /* need to check that all other rdevs with the same ->bdev |
2507 | * do not overlap. We need to unlock the mddev to avoid | |
dd8ac336 | 2508 | * a deadlock. We have already changed rdev->sectors, and if |
c5d79adb N |
2509 | * we have to change it back, we will have the lock again. |
2510 | */ | |
2511 | mddev_t *mddev; | |
2512 | int overlap = 0; | |
159ec1fc | 2513 | struct list_head *tmp; |
c5d79adb | 2514 | |
27c529bb | 2515 | mddev_unlock(my_mddev); |
29ac4aa3 | 2516 | for_each_mddev(mddev, tmp) { |
c5d79adb N |
2517 | mdk_rdev_t *rdev2; |
2518 | ||
2519 | mddev_lock(mddev); | |
159ec1fc | 2520 | list_for_each_entry(rdev2, &mddev->disks, same_set) |
c5d79adb N |
2521 | if (test_bit(AllReserved, &rdev2->flags) || |
2522 | (rdev->bdev == rdev2->bdev && | |
2523 | rdev != rdev2 && | |
dd8ac336 | 2524 | overlaps(rdev->data_offset, rdev->sectors, |
d07bd3bc | 2525 | rdev2->data_offset, |
dd8ac336 | 2526 | rdev2->sectors))) { |
c5d79adb N |
2527 | overlap = 1; |
2528 | break; | |
2529 | } | |
2530 | mddev_unlock(mddev); | |
2531 | if (overlap) { | |
2532 | mddev_put(mddev); | |
2533 | break; | |
2534 | } | |
2535 | } | |
27c529bb | 2536 | mddev_lock(my_mddev); |
c5d79adb N |
2537 | if (overlap) { |
2538 | /* Someone else could have slipped in a size | |
2539 | * change here, but doing so is just silly. | |
dd8ac336 | 2540 | * We put oldsectors back because we *know* it is |
c5d79adb N |
2541 | * safe, and trust userspace not to race with |
2542 | * itself | |
2543 | */ | |
dd8ac336 | 2544 | rdev->sectors = oldsectors; |
c5d79adb N |
2545 | return -EBUSY; |
2546 | } | |
2547 | } | |
83303b61 N |
2548 | return len; |
2549 | } | |
2550 | ||
2551 | static struct rdev_sysfs_entry rdev_size = | |
80ca3a44 | 2552 | __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store); |
83303b61 | 2553 | |
86e6ffdd N |
2554 | static struct attribute *rdev_default_attrs[] = { |
2555 | &rdev_state.attr, | |
4dbcdc75 | 2556 | &rdev_errors.attr, |
014236d2 | 2557 | &rdev_slot.attr, |
93c8cad0 | 2558 | &rdev_offset.attr, |
83303b61 | 2559 | &rdev_size.attr, |
86e6ffdd N |
2560 | NULL, |
2561 | }; | |
2562 | static ssize_t | |
2563 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2564 | { | |
2565 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2566 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2567 | mddev_t *mddev = rdev->mddev; |
2568 | ssize_t rv; | |
86e6ffdd N |
2569 | |
2570 | if (!entry->show) | |
2571 | return -EIO; | |
27c529bb N |
2572 | |
2573 | rv = mddev ? mddev_lock(mddev) : -EBUSY; | |
2574 | if (!rv) { | |
2575 | if (rdev->mddev == NULL) | |
2576 | rv = -EBUSY; | |
2577 | else | |
2578 | rv = entry->show(rdev, page); | |
2579 | mddev_unlock(mddev); | |
2580 | } | |
2581 | return rv; | |
86e6ffdd N |
2582 | } |
2583 | ||
2584 | static ssize_t | |
2585 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
2586 | const char *page, size_t length) | |
2587 | { | |
2588 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
2589 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
27c529bb N |
2590 | ssize_t rv; |
2591 | mddev_t *mddev = rdev->mddev; | |
86e6ffdd N |
2592 | |
2593 | if (!entry->store) | |
2594 | return -EIO; | |
67463acb N |
2595 | if (!capable(CAP_SYS_ADMIN)) |
2596 | return -EACCES; | |
27c529bb | 2597 | rv = mddev ? mddev_lock(mddev): -EBUSY; |
ca388059 | 2598 | if (!rv) { |
27c529bb N |
2599 | if (rdev->mddev == NULL) |
2600 | rv = -EBUSY; | |
2601 | else | |
2602 | rv = entry->store(rdev, page, length); | |
6a51830e | 2603 | mddev_unlock(mddev); |
ca388059 N |
2604 | } |
2605 | return rv; | |
86e6ffdd N |
2606 | } |
2607 | ||
2608 | static void rdev_free(struct kobject *ko) | |
2609 | { | |
2610 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
2611 | kfree(rdev); | |
2612 | } | |
2613 | static struct sysfs_ops rdev_sysfs_ops = { | |
2614 | .show = rdev_attr_show, | |
2615 | .store = rdev_attr_store, | |
2616 | }; | |
2617 | static struct kobj_type rdev_ktype = { | |
2618 | .release = rdev_free, | |
2619 | .sysfs_ops = &rdev_sysfs_ops, | |
2620 | .default_attrs = rdev_default_attrs, | |
2621 | }; | |
2622 | ||
1da177e4 LT |
2623 | /* |
2624 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
2625 | * | |
2626 | * mark the device faulty if: | |
2627 | * | |
2628 | * - the device is nonexistent (zero size) | |
2629 | * - the device has no valid superblock | |
2630 | * | |
2631 | * a faulty rdev _never_ has rdev->sb set. | |
2632 | */ | |
2633 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
2634 | { | |
2635 | char b[BDEVNAME_SIZE]; | |
2636 | int err; | |
2637 | mdk_rdev_t *rdev; | |
2638 | sector_t size; | |
2639 | ||
9ffae0cf | 2640 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
2641 | if (!rdev) { |
2642 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
2643 | return ERR_PTR(-ENOMEM); | |
2644 | } | |
1da177e4 LT |
2645 | |
2646 | if ((err = alloc_disk_sb(rdev))) | |
2647 | goto abort_free; | |
2648 | ||
c5d79adb | 2649 | err = lock_rdev(rdev, newdev, super_format == -2); |
1da177e4 LT |
2650 | if (err) |
2651 | goto abort_free; | |
2652 | ||
f9cb074b | 2653 | kobject_init(&rdev->kobj, &rdev_ktype); |
86e6ffdd | 2654 | |
1da177e4 | 2655 | rdev->desc_nr = -1; |
2b6e8459 | 2656 | rdev->saved_raid_disk = -1; |
3f9d7b0d | 2657 | rdev->raid_disk = -1; |
b2d444d7 | 2658 | rdev->flags = 0; |
1da177e4 | 2659 | rdev->data_offset = 0; |
42543769 | 2660 | rdev->sb_events = 0; |
1e50915f RB |
2661 | rdev->last_read_error.tv_sec = 0; |
2662 | rdev->last_read_error.tv_nsec = 0; | |
1da177e4 | 2663 | atomic_set(&rdev->nr_pending, 0); |
ba22dcbf | 2664 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 2665 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
2666 | |
2667 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2668 | if (!size) { | |
2669 | printk(KERN_WARNING | |
2670 | "md: %s has zero or unknown size, marking faulty!\n", | |
2671 | bdevname(rdev->bdev,b)); | |
2672 | err = -EINVAL; | |
2673 | goto abort_free; | |
2674 | } | |
2675 | ||
2676 | if (super_format >= 0) { | |
2677 | err = super_types[super_format]. | |
2678 | load_super(rdev, NULL, super_minor); | |
2679 | if (err == -EINVAL) { | |
df968c4e N |
2680 | printk(KERN_WARNING |
2681 | "md: %s does not have a valid v%d.%d " | |
2682 | "superblock, not importing!\n", | |
2683 | bdevname(rdev->bdev,b), | |
2684 | super_format, super_minor); | |
1da177e4 LT |
2685 | goto abort_free; |
2686 | } | |
2687 | if (err < 0) { | |
2688 | printk(KERN_WARNING | |
2689 | "md: could not read %s's sb, not importing!\n", | |
2690 | bdevname(rdev->bdev,b)); | |
2691 | goto abort_free; | |
2692 | } | |
2693 | } | |
6bfe0b49 | 2694 | |
1da177e4 | 2695 | INIT_LIST_HEAD(&rdev->same_set); |
6bfe0b49 | 2696 | init_waitqueue_head(&rdev->blocked_wait); |
1da177e4 LT |
2697 | |
2698 | return rdev; | |
2699 | ||
2700 | abort_free: | |
2701 | if (rdev->sb_page) { | |
2702 | if (rdev->bdev) | |
2703 | unlock_rdev(rdev); | |
2704 | free_disk_sb(rdev); | |
2705 | } | |
2706 | kfree(rdev); | |
2707 | return ERR_PTR(err); | |
2708 | } | |
2709 | ||
2710 | /* | |
2711 | * Check a full RAID array for plausibility | |
2712 | */ | |
2713 | ||
2714 | ||
a757e64c | 2715 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
2716 | { |
2717 | int i; | |
159ec1fc | 2718 | mdk_rdev_t *rdev, *freshest, *tmp; |
1da177e4 LT |
2719 | char b[BDEVNAME_SIZE]; |
2720 | ||
2721 | freshest = NULL; | |
d089c6af | 2722 | rdev_for_each(rdev, tmp, mddev) |
1da177e4 LT |
2723 | switch (super_types[mddev->major_version]. |
2724 | load_super(rdev, freshest, mddev->minor_version)) { | |
2725 | case 1: | |
2726 | freshest = rdev; | |
2727 | break; | |
2728 | case 0: | |
2729 | break; | |
2730 | default: | |
2731 | printk( KERN_ERR \ | |
2732 | "md: fatal superblock inconsistency in %s" | |
2733 | " -- removing from array\n", | |
2734 | bdevname(rdev->bdev,b)); | |
2735 | kick_rdev_from_array(rdev); | |
2736 | } | |
2737 | ||
2738 | ||
2739 | super_types[mddev->major_version]. | |
2740 | validate_super(mddev, freshest); | |
2741 | ||
2742 | i = 0; | |
d089c6af | 2743 | rdev_for_each(rdev, tmp, mddev) { |
de01dfad N |
2744 | if (rdev->desc_nr >= mddev->max_disks || |
2745 | i > mddev->max_disks) { | |
2746 | printk(KERN_WARNING | |
2747 | "md: %s: %s: only %d devices permitted\n", | |
2748 | mdname(mddev), bdevname(rdev->bdev, b), | |
2749 | mddev->max_disks); | |
2750 | kick_rdev_from_array(rdev); | |
2751 | continue; | |
2752 | } | |
1da177e4 LT |
2753 | if (rdev != freshest) |
2754 | if (super_types[mddev->major_version]. | |
2755 | validate_super(mddev, rdev)) { | |
2756 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
2757 | " from array!\n", | |
2758 | bdevname(rdev->bdev,b)); | |
2759 | kick_rdev_from_array(rdev); | |
2760 | continue; | |
2761 | } | |
2762 | if (mddev->level == LEVEL_MULTIPATH) { | |
2763 | rdev->desc_nr = i++; | |
2764 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 2765 | set_bit(In_sync, &rdev->flags); |
5e5e3e78 | 2766 | } else if (rdev->raid_disk >= (mddev->raid_disks - min(0, mddev->delta_disks))) { |
a778b73f N |
2767 | rdev->raid_disk = -1; |
2768 | clear_bit(In_sync, &rdev->flags); | |
1da177e4 LT |
2769 | } |
2770 | } | |
1da177e4 LT |
2771 | } |
2772 | ||
72e02075 N |
2773 | /* Read a fixed-point number. |
2774 | * Numbers in sysfs attributes should be in "standard" units where | |
2775 | * possible, so time should be in seconds. | |
2776 | * However we internally use a a much smaller unit such as | |
2777 | * milliseconds or jiffies. | |
2778 | * This function takes a decimal number with a possible fractional | |
2779 | * component, and produces an integer which is the result of | |
2780 | * multiplying that number by 10^'scale'. | |
2781 | * all without any floating-point arithmetic. | |
2782 | */ | |
2783 | int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale) | |
2784 | { | |
2785 | unsigned long result = 0; | |
2786 | long decimals = -1; | |
2787 | while (isdigit(*cp) || (*cp == '.' && decimals < 0)) { | |
2788 | if (*cp == '.') | |
2789 | decimals = 0; | |
2790 | else if (decimals < scale) { | |
2791 | unsigned int value; | |
2792 | value = *cp - '0'; | |
2793 | result = result * 10 + value; | |
2794 | if (decimals >= 0) | |
2795 | decimals++; | |
2796 | } | |
2797 | cp++; | |
2798 | } | |
2799 | if (*cp == '\n') | |
2800 | cp++; | |
2801 | if (*cp) | |
2802 | return -EINVAL; | |
2803 | if (decimals < 0) | |
2804 | decimals = 0; | |
2805 | while (decimals < scale) { | |
2806 | result *= 10; | |
2807 | decimals ++; | |
2808 | } | |
2809 | *res = result; | |
2810 | return 0; | |
2811 | } | |
2812 | ||
2813 | ||
19052c0e N |
2814 | static void md_safemode_timeout(unsigned long data); |
2815 | ||
16f17b39 N |
2816 | static ssize_t |
2817 | safe_delay_show(mddev_t *mddev, char *page) | |
2818 | { | |
2819 | int msec = (mddev->safemode_delay*1000)/HZ; | |
2820 | return sprintf(page, "%d.%03d\n", msec/1000, msec%1000); | |
2821 | } | |
2822 | static ssize_t | |
2823 | safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len) | |
2824 | { | |
16f17b39 | 2825 | unsigned long msec; |
97ce0a7f | 2826 | |
72e02075 | 2827 | if (strict_strtoul_scaled(cbuf, &msec, 3) < 0) |
16f17b39 | 2828 | return -EINVAL; |
16f17b39 N |
2829 | if (msec == 0) |
2830 | mddev->safemode_delay = 0; | |
2831 | else { | |
19052c0e | 2832 | unsigned long old_delay = mddev->safemode_delay; |
16f17b39 N |
2833 | mddev->safemode_delay = (msec*HZ)/1000; |
2834 | if (mddev->safemode_delay == 0) | |
2835 | mddev->safemode_delay = 1; | |
19052c0e N |
2836 | if (mddev->safemode_delay < old_delay) |
2837 | md_safemode_timeout((unsigned long)mddev); | |
16f17b39 N |
2838 | } |
2839 | return len; | |
2840 | } | |
2841 | static struct md_sysfs_entry md_safe_delay = | |
80ca3a44 | 2842 | __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store); |
16f17b39 | 2843 | |
eae1701f | 2844 | static ssize_t |
96de1e66 | 2845 | level_show(mddev_t *mddev, char *page) |
eae1701f | 2846 | { |
2604b703 | 2847 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 2848 | if (p) |
eae1701f | 2849 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
2850 | else if (mddev->clevel[0]) |
2851 | return sprintf(page, "%s\n", mddev->clevel); | |
2852 | else if (mddev->level != LEVEL_NONE) | |
2853 | return sprintf(page, "%d\n", mddev->level); | |
2854 | else | |
2855 | return 0; | |
eae1701f N |
2856 | } |
2857 | ||
d9d166c2 N |
2858 | static ssize_t |
2859 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
2860 | { | |
245f46c2 | 2861 | char level[16]; |
20a49ff6 | 2862 | ssize_t rv = len; |
245f46c2 N |
2863 | struct mdk_personality *pers; |
2864 | void *priv; | |
3a981b03 | 2865 | mdk_rdev_t *rdev; |
245f46c2 N |
2866 | |
2867 | if (mddev->pers == NULL) { | |
2868 | if (len == 0) | |
2869 | return 0; | |
2870 | if (len >= sizeof(mddev->clevel)) | |
2871 | return -ENOSPC; | |
2872 | strncpy(mddev->clevel, buf, len); | |
2873 | if (mddev->clevel[len-1] == '\n') | |
2874 | len--; | |
2875 | mddev->clevel[len] = 0; | |
2876 | mddev->level = LEVEL_NONE; | |
2877 | return rv; | |
2878 | } | |
2879 | ||
2880 | /* request to change the personality. Need to ensure: | |
2881 | * - array is not engaged in resync/recovery/reshape | |
2882 | * - old personality can be suspended | |
2883 | * - new personality will access other array. | |
2884 | */ | |
2885 | ||
2886 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) | |
d9d166c2 | 2887 | return -EBUSY; |
245f46c2 N |
2888 | |
2889 | if (!mddev->pers->quiesce) { | |
2890 | printk(KERN_WARNING "md: %s: %s does not support online personality change\n", | |
2891 | mdname(mddev), mddev->pers->name); | |
2892 | return -EINVAL; | |
2893 | } | |
2894 | ||
2895 | /* Now find the new personality */ | |
2896 | if (len == 0 || len >= sizeof(level)) | |
2897 | return -EINVAL; | |
2898 | strncpy(level, buf, len); | |
2899 | if (level[len-1] == '\n') | |
d9d166c2 | 2900 | len--; |
245f46c2 N |
2901 | level[len] = 0; |
2902 | ||
2903 | request_module("md-%s", level); | |
2904 | spin_lock(&pers_lock); | |
2905 | pers = find_pers(LEVEL_NONE, level); | |
2906 | if (!pers || !try_module_get(pers->owner)) { | |
2907 | spin_unlock(&pers_lock); | |
2908 | printk(KERN_WARNING "md: personality %s not loaded\n", level); | |
2909 | return -EINVAL; | |
2910 | } | |
2911 | spin_unlock(&pers_lock); | |
2912 | ||
2913 | if (pers == mddev->pers) { | |
2914 | /* Nothing to do! */ | |
2915 | module_put(pers->owner); | |
2916 | return rv; | |
2917 | } | |
2918 | if (!pers->takeover) { | |
2919 | module_put(pers->owner); | |
2920 | printk(KERN_WARNING "md: %s: %s does not support personality takeover\n", | |
2921 | mdname(mddev), level); | |
2922 | return -EINVAL; | |
2923 | } | |
2924 | ||
2925 | /* ->takeover must set new_* and/or delta_disks | |
2926 | * if it succeeds, and may set them when it fails. | |
2927 | */ | |
2928 | priv = pers->takeover(mddev); | |
2929 | if (IS_ERR(priv)) { | |
2930 | mddev->new_level = mddev->level; | |
2931 | mddev->new_layout = mddev->layout; | |
664e7c41 | 2932 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
245f46c2 N |
2933 | mddev->raid_disks -= mddev->delta_disks; |
2934 | mddev->delta_disks = 0; | |
2935 | module_put(pers->owner); | |
2936 | printk(KERN_WARNING "md: %s: %s would not accept array\n", | |
2937 | mdname(mddev), level); | |
2938 | return PTR_ERR(priv); | |
2939 | } | |
2940 | ||
2941 | /* Looks like we have a winner */ | |
2942 | mddev_suspend(mddev); | |
2943 | mddev->pers->stop(mddev); | |
2944 | module_put(mddev->pers->owner); | |
3a981b03 N |
2945 | /* Invalidate devices that are now superfluous */ |
2946 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
2947 | if (rdev->raid_disk >= mddev->raid_disks) { | |
2948 | rdev->raid_disk = -1; | |
2949 | clear_bit(In_sync, &rdev->flags); | |
2950 | } | |
245f46c2 N |
2951 | mddev->pers = pers; |
2952 | mddev->private = priv; | |
2953 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
2954 | mddev->level = mddev->new_level; | |
2955 | mddev->layout = mddev->new_layout; | |
664e7c41 | 2956 | mddev->chunk_sectors = mddev->new_chunk_sectors; |
245f46c2 N |
2957 | mddev->delta_disks = 0; |
2958 | pers->run(mddev); | |
2959 | mddev_resume(mddev); | |
2960 | set_bit(MD_CHANGE_DEVS, &mddev->flags); | |
2961 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2962 | md_wakeup_thread(mddev->thread); | |
d9d166c2 N |
2963 | return rv; |
2964 | } | |
2965 | ||
2966 | static struct md_sysfs_entry md_level = | |
80ca3a44 | 2967 | __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store); |
eae1701f | 2968 | |
d4dbd025 N |
2969 | |
2970 | static ssize_t | |
2971 | layout_show(mddev_t *mddev, char *page) | |
2972 | { | |
2973 | /* just a number, not meaningful for all levels */ | |
08a02ecd N |
2974 | if (mddev->reshape_position != MaxSector && |
2975 | mddev->layout != mddev->new_layout) | |
2976 | return sprintf(page, "%d (%d)\n", | |
2977 | mddev->new_layout, mddev->layout); | |
d4dbd025 N |
2978 | return sprintf(page, "%d\n", mddev->layout); |
2979 | } | |
2980 | ||
2981 | static ssize_t | |
2982 | layout_store(mddev_t *mddev, const char *buf, size_t len) | |
2983 | { | |
2984 | char *e; | |
2985 | unsigned long n = simple_strtoul(buf, &e, 10); | |
d4dbd025 N |
2986 | |
2987 | if (!*buf || (*e && *e != '\n')) | |
2988 | return -EINVAL; | |
2989 | ||
b3546035 N |
2990 | if (mddev->pers) { |
2991 | int err; | |
50ac168a | 2992 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 2993 | return -EBUSY; |
597a711b | 2994 | mddev->new_layout = n; |
50ac168a | 2995 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
2996 | if (err) { |
2997 | mddev->new_layout = mddev->layout; | |
b3546035 | 2998 | return err; |
597a711b | 2999 | } |
b3546035 | 3000 | } else { |
08a02ecd | 3001 | mddev->new_layout = n; |
b3546035 N |
3002 | if (mddev->reshape_position == MaxSector) |
3003 | mddev->layout = n; | |
3004 | } | |
d4dbd025 N |
3005 | return len; |
3006 | } | |
3007 | static struct md_sysfs_entry md_layout = | |
80ca3a44 | 3008 | __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store); |
d4dbd025 N |
3009 | |
3010 | ||
eae1701f | 3011 | static ssize_t |
96de1e66 | 3012 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 3013 | { |
bb636547 N |
3014 | if (mddev->raid_disks == 0) |
3015 | return 0; | |
08a02ecd N |
3016 | if (mddev->reshape_position != MaxSector && |
3017 | mddev->delta_disks != 0) | |
3018 | return sprintf(page, "%d (%d)\n", mddev->raid_disks, | |
3019 | mddev->raid_disks - mddev->delta_disks); | |
eae1701f N |
3020 | return sprintf(page, "%d\n", mddev->raid_disks); |
3021 | } | |
3022 | ||
da943b99 N |
3023 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
3024 | ||
3025 | static ssize_t | |
3026 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
3027 | { | |
da943b99 N |
3028 | char *e; |
3029 | int rv = 0; | |
3030 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3031 | ||
3032 | if (!*buf || (*e && *e != '\n')) | |
3033 | return -EINVAL; | |
3034 | ||
3035 | if (mddev->pers) | |
3036 | rv = update_raid_disks(mddev, n); | |
08a02ecd N |
3037 | else if (mddev->reshape_position != MaxSector) { |
3038 | int olddisks = mddev->raid_disks - mddev->delta_disks; | |
3039 | mddev->delta_disks = n - olddisks; | |
3040 | mddev->raid_disks = n; | |
3041 | } else | |
da943b99 N |
3042 | mddev->raid_disks = n; |
3043 | return rv ? rv : len; | |
3044 | } | |
3045 | static struct md_sysfs_entry md_raid_disks = | |
80ca3a44 | 3046 | __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store); |
eae1701f | 3047 | |
3b34380a N |
3048 | static ssize_t |
3049 | chunk_size_show(mddev_t *mddev, char *page) | |
3050 | { | |
08a02ecd | 3051 | if (mddev->reshape_position != MaxSector && |
664e7c41 AN |
3052 | mddev->chunk_sectors != mddev->new_chunk_sectors) |
3053 | return sprintf(page, "%d (%d)\n", | |
3054 | mddev->new_chunk_sectors << 9, | |
9d8f0363 AN |
3055 | mddev->chunk_sectors << 9); |
3056 | return sprintf(page, "%d\n", mddev->chunk_sectors << 9); | |
3b34380a N |
3057 | } |
3058 | ||
3059 | static ssize_t | |
3060 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3061 | { | |
3b34380a N |
3062 | char *e; |
3063 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3064 | ||
3b34380a N |
3065 | if (!*buf || (*e && *e != '\n')) |
3066 | return -EINVAL; | |
3067 | ||
b3546035 N |
3068 | if (mddev->pers) { |
3069 | int err; | |
50ac168a | 3070 | if (mddev->pers->check_reshape == NULL) |
b3546035 | 3071 | return -EBUSY; |
597a711b | 3072 | mddev->new_chunk_sectors = n >> 9; |
50ac168a | 3073 | err = mddev->pers->check_reshape(mddev); |
597a711b N |
3074 | if (err) { |
3075 | mddev->new_chunk_sectors = mddev->chunk_sectors; | |
b3546035 | 3076 | return err; |
597a711b | 3077 | } |
b3546035 | 3078 | } else { |
664e7c41 | 3079 | mddev->new_chunk_sectors = n >> 9; |
b3546035 | 3080 | if (mddev->reshape_position == MaxSector) |
9d8f0363 | 3081 | mddev->chunk_sectors = n >> 9; |
b3546035 | 3082 | } |
3b34380a N |
3083 | return len; |
3084 | } | |
3085 | static struct md_sysfs_entry md_chunk_size = | |
80ca3a44 | 3086 | __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store); |
3b34380a | 3087 | |
a94213b1 N |
3088 | static ssize_t |
3089 | resync_start_show(mddev_t *mddev, char *page) | |
3090 | { | |
d1a7c503 N |
3091 | if (mddev->recovery_cp == MaxSector) |
3092 | return sprintf(page, "none\n"); | |
a94213b1 N |
3093 | return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp); |
3094 | } | |
3095 | ||
3096 | static ssize_t | |
3097 | resync_start_store(mddev_t *mddev, const char *buf, size_t len) | |
3098 | { | |
a94213b1 N |
3099 | char *e; |
3100 | unsigned long long n = simple_strtoull(buf, &e, 10); | |
3101 | ||
3102 | if (mddev->pers) | |
3103 | return -EBUSY; | |
3104 | if (!*buf || (*e && *e != '\n')) | |
3105 | return -EINVAL; | |
3106 | ||
3107 | mddev->recovery_cp = n; | |
3108 | return len; | |
3109 | } | |
3110 | static struct md_sysfs_entry md_resync_start = | |
80ca3a44 | 3111 | __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store); |
a94213b1 | 3112 | |
9e653b63 N |
3113 | /* |
3114 | * The array state can be: | |
3115 | * | |
3116 | * clear | |
3117 | * No devices, no size, no level | |
3118 | * Equivalent to STOP_ARRAY ioctl | |
3119 | * inactive | |
3120 | * May have some settings, but array is not active | |
3121 | * all IO results in error | |
3122 | * When written, doesn't tear down array, but just stops it | |
3123 | * suspended (not supported yet) | |
3124 | * All IO requests will block. The array can be reconfigured. | |
910d8cb3 | 3125 | * Writing this, if accepted, will block until array is quiescent |
9e653b63 N |
3126 | * readonly |
3127 | * no resync can happen. no superblocks get written. | |
3128 | * write requests fail | |
3129 | * read-auto | |
3130 | * like readonly, but behaves like 'clean' on a write request. | |
3131 | * | |
3132 | * clean - no pending writes, but otherwise active. | |
3133 | * When written to inactive array, starts without resync | |
3134 | * If a write request arrives then | |
3135 | * if metadata is known, mark 'dirty' and switch to 'active'. | |
3136 | * if not known, block and switch to write-pending | |
3137 | * If written to an active array that has pending writes, then fails. | |
3138 | * active | |
3139 | * fully active: IO and resync can be happening. | |
3140 | * When written to inactive array, starts with resync | |
3141 | * | |
3142 | * write-pending | |
3143 | * clean, but writes are blocked waiting for 'active' to be written. | |
3144 | * | |
3145 | * active-idle | |
3146 | * like active, but no writes have been seen for a while (100msec). | |
3147 | * | |
3148 | */ | |
3149 | enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active, | |
3150 | write_pending, active_idle, bad_word}; | |
05381954 | 3151 | static char *array_states[] = { |
9e653b63 N |
3152 | "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active", |
3153 | "write-pending", "active-idle", NULL }; | |
3154 | ||
3155 | static int match_word(const char *word, char **list) | |
3156 | { | |
3157 | int n; | |
3158 | for (n=0; list[n]; n++) | |
3159 | if (cmd_match(word, list[n])) | |
3160 | break; | |
3161 | return n; | |
3162 | } | |
3163 | ||
3164 | static ssize_t | |
3165 | array_state_show(mddev_t *mddev, char *page) | |
3166 | { | |
3167 | enum array_state st = inactive; | |
3168 | ||
3169 | if (mddev->pers) | |
3170 | switch(mddev->ro) { | |
3171 | case 1: | |
3172 | st = readonly; | |
3173 | break; | |
3174 | case 2: | |
3175 | st = read_auto; | |
3176 | break; | |
3177 | case 0: | |
3178 | if (mddev->in_sync) | |
3179 | st = clean; | |
e691063a N |
3180 | else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) |
3181 | st = write_pending; | |
9e653b63 N |
3182 | else if (mddev->safemode) |
3183 | st = active_idle; | |
3184 | else | |
3185 | st = active; | |
3186 | } | |
3187 | else { | |
3188 | if (list_empty(&mddev->disks) && | |
3189 | mddev->raid_disks == 0 && | |
58c0fed4 | 3190 | mddev->dev_sectors == 0) |
9e653b63 N |
3191 | st = clear; |
3192 | else | |
3193 | st = inactive; | |
3194 | } | |
3195 | return sprintf(page, "%s\n", array_states[st]); | |
3196 | } | |
3197 | ||
df5b20cf | 3198 | static int do_md_stop(mddev_t * mddev, int ro, int is_open); |
9e653b63 N |
3199 | static int do_md_run(mddev_t * mddev); |
3200 | static int restart_array(mddev_t *mddev); | |
3201 | ||
3202 | static ssize_t | |
3203 | array_state_store(mddev_t *mddev, const char *buf, size_t len) | |
3204 | { | |
3205 | int err = -EINVAL; | |
3206 | enum array_state st = match_word(buf, array_states); | |
3207 | switch(st) { | |
3208 | case bad_word: | |
3209 | break; | |
3210 | case clear: | |
3211 | /* stopping an active array */ | |
f2ea68cf | 3212 | if (atomic_read(&mddev->openers) > 0) |
e691063a | 3213 | return -EBUSY; |
df5b20cf | 3214 | err = do_md_stop(mddev, 0, 0); |
9e653b63 N |
3215 | break; |
3216 | case inactive: | |
3217 | /* stopping an active array */ | |
3218 | if (mddev->pers) { | |
f2ea68cf | 3219 | if (atomic_read(&mddev->openers) > 0) |
9e653b63 | 3220 | return -EBUSY; |
df5b20cf | 3221 | err = do_md_stop(mddev, 2, 0); |
e691063a N |
3222 | } else |
3223 | err = 0; /* already inactive */ | |
9e653b63 N |
3224 | break; |
3225 | case suspended: | |
3226 | break; /* not supported yet */ | |
3227 | case readonly: | |
3228 | if (mddev->pers) | |
df5b20cf | 3229 | err = do_md_stop(mddev, 1, 0); |
9e653b63 N |
3230 | else { |
3231 | mddev->ro = 1; | |
648b629e | 3232 | set_disk_ro(mddev->gendisk, 1); |
9e653b63 N |
3233 | err = do_md_run(mddev); |
3234 | } | |
3235 | break; | |
3236 | case read_auto: | |
9e653b63 | 3237 | if (mddev->pers) { |
80268ee9 | 3238 | if (mddev->ro == 0) |
df5b20cf | 3239 | err = do_md_stop(mddev, 1, 0); |
80268ee9 | 3240 | else if (mddev->ro == 1) |
648b629e N |
3241 | err = restart_array(mddev); |
3242 | if (err == 0) { | |
3243 | mddev->ro = 2; | |
3244 | set_disk_ro(mddev->gendisk, 0); | |
3245 | } | |
9e653b63 N |
3246 | } else { |
3247 | mddev->ro = 2; | |
3248 | err = do_md_run(mddev); | |
3249 | } | |
3250 | break; | |
3251 | case clean: | |
3252 | if (mddev->pers) { | |
3253 | restart_array(mddev); | |
3254 | spin_lock_irq(&mddev->write_lock); | |
3255 | if (atomic_read(&mddev->writes_pending) == 0) { | |
e691063a N |
3256 | if (mddev->in_sync == 0) { |
3257 | mddev->in_sync = 1; | |
31a59e34 N |
3258 | if (mddev->safemode == 1) |
3259 | mddev->safemode = 0; | |
e691063a N |
3260 | if (mddev->persistent) |
3261 | set_bit(MD_CHANGE_CLEAN, | |
3262 | &mddev->flags); | |
3263 | } | |
3264 | err = 0; | |
3265 | } else | |
3266 | err = -EBUSY; | |
9e653b63 | 3267 | spin_unlock_irq(&mddev->write_lock); |
5bf29597 N |
3268 | } else |
3269 | err = -EINVAL; | |
9e653b63 N |
3270 | break; |
3271 | case active: | |
3272 | if (mddev->pers) { | |
3273 | restart_array(mddev); | |
e691063a N |
3274 | if (mddev->external) |
3275 | clear_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
9e653b63 N |
3276 | wake_up(&mddev->sb_wait); |
3277 | err = 0; | |
3278 | } else { | |
3279 | mddev->ro = 0; | |
648b629e | 3280 | set_disk_ro(mddev->gendisk, 0); |
9e653b63 N |
3281 | err = do_md_run(mddev); |
3282 | } | |
3283 | break; | |
3284 | case write_pending: | |
3285 | case active_idle: | |
3286 | /* these cannot be set */ | |
3287 | break; | |
3288 | } | |
3289 | if (err) | |
3290 | return err; | |
0fd62b86 | 3291 | else { |
b62b7590 | 3292 | sysfs_notify_dirent(mddev->sysfs_state); |
9e653b63 | 3293 | return len; |
0fd62b86 | 3294 | } |
9e653b63 | 3295 | } |
80ca3a44 N |
3296 | static struct md_sysfs_entry md_array_state = |
3297 | __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store); | |
9e653b63 | 3298 | |
1e50915f RB |
3299 | static ssize_t |
3300 | max_corrected_read_errors_show(mddev_t *mddev, char *page) { | |
3301 | return sprintf(page, "%d\n", | |
3302 | atomic_read(&mddev->max_corr_read_errors)); | |
3303 | } | |
3304 | ||
3305 | static ssize_t | |
3306 | max_corrected_read_errors_store(mddev_t *mddev, const char *buf, size_t len) | |
3307 | { | |
3308 | char *e; | |
3309 | unsigned long n = simple_strtoul(buf, &e, 10); | |
3310 | ||
3311 | if (*buf && (*e == 0 || *e == '\n')) { | |
3312 | atomic_set(&mddev->max_corr_read_errors, n); | |
3313 | return len; | |
3314 | } | |
3315 | return -EINVAL; | |
3316 | } | |
3317 | ||
3318 | static struct md_sysfs_entry max_corr_read_errors = | |
3319 | __ATTR(max_read_errors, S_IRUGO|S_IWUSR, max_corrected_read_errors_show, | |
3320 | max_corrected_read_errors_store); | |
3321 | ||
6d7ff738 N |
3322 | static ssize_t |
3323 | null_show(mddev_t *mddev, char *page) | |
3324 | { | |
3325 | return -EINVAL; | |
3326 | } | |
3327 | ||
3328 | static ssize_t | |
3329 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
3330 | { | |
3331 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
3332 | /* The new device is added to the array. | |
3333 | * If the array has a persistent superblock, we read the | |
3334 | * superblock to initialise info and check validity. | |
3335 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
3336 | * which mainly checks size. | |
3337 | */ | |
3338 | char *e; | |
3339 | int major = simple_strtoul(buf, &e, 10); | |
3340 | int minor; | |
3341 | dev_t dev; | |
3342 | mdk_rdev_t *rdev; | |
3343 | int err; | |
3344 | ||
3345 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
3346 | return -EINVAL; | |
3347 | minor = simple_strtoul(e+1, &e, 10); | |
3348 | if (*e && *e != '\n') | |
3349 | return -EINVAL; | |
3350 | dev = MKDEV(major, minor); | |
3351 | if (major != MAJOR(dev) || | |
3352 | minor != MINOR(dev)) | |
3353 | return -EOVERFLOW; | |
3354 | ||
3355 | ||
3356 | if (mddev->persistent) { | |
3357 | rdev = md_import_device(dev, mddev->major_version, | |
3358 | mddev->minor_version); | |
3359 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
3360 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3361 | mdk_rdev_t, same_set); | |
3362 | err = super_types[mddev->major_version] | |
3363 | .load_super(rdev, rdev0, mddev->minor_version); | |
3364 | if (err < 0) | |
3365 | goto out; | |
3366 | } | |
c5d79adb N |
3367 | } else if (mddev->external) |
3368 | rdev = md_import_device(dev, -2, -1); | |
3369 | else | |
6d7ff738 N |
3370 | rdev = md_import_device(dev, -1, -1); |
3371 | ||
3372 | if (IS_ERR(rdev)) | |
3373 | return PTR_ERR(rdev); | |
3374 | err = bind_rdev_to_array(rdev, mddev); | |
3375 | out: | |
3376 | if (err) | |
3377 | export_rdev(rdev); | |
3378 | return err ? err : len; | |
3379 | } | |
3380 | ||
3381 | static struct md_sysfs_entry md_new_device = | |
80ca3a44 | 3382 | __ATTR(new_dev, S_IWUSR, null_show, new_dev_store); |
3b34380a | 3383 | |
9b1d1dac PC |
3384 | static ssize_t |
3385 | bitmap_store(mddev_t *mddev, const char *buf, size_t len) | |
3386 | { | |
3387 | char *end; | |
3388 | unsigned long chunk, end_chunk; | |
3389 | ||
3390 | if (!mddev->bitmap) | |
3391 | goto out; | |
3392 | /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */ | |
3393 | while (*buf) { | |
3394 | chunk = end_chunk = simple_strtoul(buf, &end, 0); | |
3395 | if (buf == end) break; | |
3396 | if (*end == '-') { /* range */ | |
3397 | buf = end + 1; | |
3398 | end_chunk = simple_strtoul(buf, &end, 0); | |
3399 | if (buf == end) break; | |
3400 | } | |
3401 | if (*end && !isspace(*end)) break; | |
3402 | bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk); | |
3403 | buf = end; | |
3404 | while (isspace(*buf)) buf++; | |
3405 | } | |
3406 | bitmap_unplug(mddev->bitmap); /* flush the bits to disk */ | |
3407 | out: | |
3408 | return len; | |
3409 | } | |
3410 | ||
3411 | static struct md_sysfs_entry md_bitmap = | |
3412 | __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store); | |
3413 | ||
a35b0d69 N |
3414 | static ssize_t |
3415 | size_show(mddev_t *mddev, char *page) | |
3416 | { | |
58c0fed4 AN |
3417 | return sprintf(page, "%llu\n", |
3418 | (unsigned long long)mddev->dev_sectors / 2); | |
a35b0d69 N |
3419 | } |
3420 | ||
d71f9f88 | 3421 | static int update_size(mddev_t *mddev, sector_t num_sectors); |
a35b0d69 N |
3422 | |
3423 | static ssize_t | |
3424 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
3425 | { | |
3426 | /* If array is inactive, we can reduce the component size, but | |
3427 | * not increase it (except from 0). | |
3428 | * If array is active, we can try an on-line resize | |
3429 | */ | |
b522adcd DW |
3430 | sector_t sectors; |
3431 | int err = strict_blocks_to_sectors(buf, §ors); | |
a35b0d69 | 3432 | |
58c0fed4 AN |
3433 | if (err < 0) |
3434 | return err; | |
a35b0d69 | 3435 | if (mddev->pers) { |
58c0fed4 | 3436 | err = update_size(mddev, sectors); |
850b2b42 | 3437 | md_update_sb(mddev, 1); |
a35b0d69 | 3438 | } else { |
58c0fed4 AN |
3439 | if (mddev->dev_sectors == 0 || |
3440 | mddev->dev_sectors > sectors) | |
3441 | mddev->dev_sectors = sectors; | |
a35b0d69 N |
3442 | else |
3443 | err = -ENOSPC; | |
3444 | } | |
3445 | return err ? err : len; | |
3446 | } | |
3447 | ||
3448 | static struct md_sysfs_entry md_size = | |
80ca3a44 | 3449 | __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store); |
a35b0d69 | 3450 | |
8bb93aac N |
3451 | |
3452 | /* Metdata version. | |
e691063a N |
3453 | * This is one of |
3454 | * 'none' for arrays with no metadata (good luck...) | |
3455 | * 'external' for arrays with externally managed metadata, | |
8bb93aac N |
3456 | * or N.M for internally known formats |
3457 | */ | |
3458 | static ssize_t | |
3459 | metadata_show(mddev_t *mddev, char *page) | |
3460 | { | |
3461 | if (mddev->persistent) | |
3462 | return sprintf(page, "%d.%d\n", | |
3463 | mddev->major_version, mddev->minor_version); | |
e691063a N |
3464 | else if (mddev->external) |
3465 | return sprintf(page, "external:%s\n", mddev->metadata_type); | |
8bb93aac N |
3466 | else |
3467 | return sprintf(page, "none\n"); | |
3468 | } | |
3469 | ||
3470 | static ssize_t | |
3471 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
3472 | { | |
3473 | int major, minor; | |
3474 | char *e; | |
ea43ddd8 N |
3475 | /* Changing the details of 'external' metadata is |
3476 | * always permitted. Otherwise there must be | |
3477 | * no devices attached to the array. | |
3478 | */ | |
3479 | if (mddev->external && strncmp(buf, "external:", 9) == 0) | |
3480 | ; | |
3481 | else if (!list_empty(&mddev->disks)) | |
8bb93aac N |
3482 | return -EBUSY; |
3483 | ||
3484 | if (cmd_match(buf, "none")) { | |
3485 | mddev->persistent = 0; | |
e691063a N |
3486 | mddev->external = 0; |
3487 | mddev->major_version = 0; | |
3488 | mddev->minor_version = 90; | |
3489 | return len; | |
3490 | } | |
3491 | if (strncmp(buf, "external:", 9) == 0) { | |
20a49ff6 | 3492 | size_t namelen = len-9; |
e691063a N |
3493 | if (namelen >= sizeof(mddev->metadata_type)) |
3494 | namelen = sizeof(mddev->metadata_type)-1; | |
3495 | strncpy(mddev->metadata_type, buf+9, namelen); | |
3496 | mddev->metadata_type[namelen] = 0; | |
3497 | if (namelen && mddev->metadata_type[namelen-1] == '\n') | |
3498 | mddev->metadata_type[--namelen] = 0; | |
3499 | mddev->persistent = 0; | |
3500 | mddev->external = 1; | |
8bb93aac N |
3501 | mddev->major_version = 0; |
3502 | mddev->minor_version = 90; | |
3503 | return len; | |
3504 | } | |
3505 | major = simple_strtoul(buf, &e, 10); | |
3506 | if (e==buf || *e != '.') | |
3507 | return -EINVAL; | |
3508 | buf = e+1; | |
3509 | minor = simple_strtoul(buf, &e, 10); | |
3f9d7b0d | 3510 | if (e==buf || (*e && *e != '\n') ) |
8bb93aac | 3511 | return -EINVAL; |
50511da3 | 3512 | if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL) |
8bb93aac N |
3513 | return -ENOENT; |
3514 | mddev->major_version = major; | |
3515 | mddev->minor_version = minor; | |
3516 | mddev->persistent = 1; | |
e691063a | 3517 | mddev->external = 0; |
8bb93aac N |
3518 | return len; |
3519 | } | |
3520 | ||
3521 | static struct md_sysfs_entry md_metadata = | |
80ca3a44 | 3522 | __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store); |
8bb93aac | 3523 | |
24dd469d | 3524 | static ssize_t |
7eec314d | 3525 | action_show(mddev_t *mddev, char *page) |
24dd469d | 3526 | { |
7eec314d | 3527 | char *type = "idle"; |
b6a9ce68 N |
3528 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
3529 | type = "frozen"; | |
3530 | else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
2b12ab6d | 3531 | (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) { |
ccfcc3c1 N |
3532 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
3533 | type = "reshape"; | |
3534 | else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
3535 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
3536 | type = "resync"; | |
3537 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
3538 | type = "check"; | |
3539 | else | |
3540 | type = "repair"; | |
72a23c21 | 3541 | } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) |
24dd469d N |
3542 | type = "recover"; |
3543 | } | |
3544 | return sprintf(page, "%s\n", type); | |
3545 | } | |
3546 | ||
3547 | static ssize_t | |
7eec314d | 3548 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 3549 | { |
7eec314d N |
3550 | if (!mddev->pers || !mddev->pers->sync_request) |
3551 | return -EINVAL; | |
3552 | ||
b6a9ce68 N |
3553 | if (cmd_match(page, "frozen")) |
3554 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3555 | else | |
3556 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); | |
3557 | ||
3558 | if (cmd_match(page, "idle") || cmd_match(page, "frozen")) { | |
7eec314d N |
3559 | if (mddev->sync_thread) { |
3560 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3561 | md_unregister_thread(mddev->sync_thread); | |
3562 | mddev->sync_thread = NULL; | |
3563 | mddev->recovery = 0; | |
3564 | } | |
03c902e1 N |
3565 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
3566 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 3567 | return -EBUSY; |
72a23c21 NB |
3568 | else if (cmd_match(page, "resync")) |
3569 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3570 | else if (cmd_match(page, "recover")) { | |
3571 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
7eec314d | 3572 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
72a23c21 | 3573 | } else if (cmd_match(page, "reshape")) { |
16484bf5 N |
3574 | int err; |
3575 | if (mddev->pers->start_reshape == NULL) | |
3576 | return -EINVAL; | |
3577 | err = mddev->pers->start_reshape(mddev); | |
3578 | if (err) | |
3579 | return err; | |
a99ac971 | 3580 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
16484bf5 | 3581 | } else { |
bce74dac | 3582 | if (cmd_match(page, "check")) |
7eec314d | 3583 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
2adc7d47 | 3584 | else if (!cmd_match(page, "repair")) |
7eec314d N |
3585 | return -EINVAL; |
3586 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
3587 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 3588 | } |
03c902e1 | 3589 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d | 3590 | md_wakeup_thread(mddev->thread); |
0c3573f1 | 3591 | sysfs_notify_dirent(mddev->sysfs_action); |
24dd469d N |
3592 | return len; |
3593 | } | |
3594 | ||
9d88883e | 3595 | static ssize_t |
96de1e66 | 3596 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
3597 | { |
3598 | return sprintf(page, "%llu\n", | |
3599 | (unsigned long long) mddev->resync_mismatches); | |
3600 | } | |
3601 | ||
80ca3a44 N |
3602 | static struct md_sysfs_entry md_scan_mode = |
3603 | __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); | |
24dd469d | 3604 | |
96de1e66 | 3605 | |
80ca3a44 | 3606 | static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt); |
9d88883e | 3607 | |
88202a0c N |
3608 | static ssize_t |
3609 | sync_min_show(mddev_t *mddev, char *page) | |
3610 | { | |
3611 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
3612 | mddev->sync_speed_min ? "local": "system"); | |
3613 | } | |
3614 | ||
3615 | static ssize_t | |
3616 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
3617 | { | |
3618 | int min; | |
3619 | char *e; | |
3620 | if (strncmp(buf, "system", 6)==0) { | |
3621 | mddev->sync_speed_min = 0; | |
3622 | return len; | |
3623 | } | |
3624 | min = simple_strtoul(buf, &e, 10); | |
3625 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
3626 | return -EINVAL; | |
3627 | mddev->sync_speed_min = min; | |
3628 | return len; | |
3629 | } | |
3630 | ||
3631 | static struct md_sysfs_entry md_sync_min = | |
3632 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
3633 | ||
3634 | static ssize_t | |
3635 | sync_max_show(mddev_t *mddev, char *page) | |
3636 | { | |
3637 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
3638 | mddev->sync_speed_max ? "local": "system"); | |
3639 | } | |
3640 | ||
3641 | static ssize_t | |
3642 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
3643 | { | |
3644 | int max; | |
3645 | char *e; | |
3646 | if (strncmp(buf, "system", 6)==0) { | |
3647 | mddev->sync_speed_max = 0; | |
3648 | return len; | |
3649 | } | |
3650 | max = simple_strtoul(buf, &e, 10); | |
3651 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
3652 | return -EINVAL; | |
3653 | mddev->sync_speed_max = max; | |
3654 | return len; | |
3655 | } | |
3656 | ||
3657 | static struct md_sysfs_entry md_sync_max = | |
3658 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
3659 | ||
d7f3d291 IP |
3660 | static ssize_t |
3661 | degraded_show(mddev_t *mddev, char *page) | |
3662 | { | |
3663 | return sprintf(page, "%d\n", mddev->degraded); | |
3664 | } | |
3665 | static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded); | |
88202a0c | 3666 | |
90b08710 BS |
3667 | static ssize_t |
3668 | sync_force_parallel_show(mddev_t *mddev, char *page) | |
3669 | { | |
3670 | return sprintf(page, "%d\n", mddev->parallel_resync); | |
3671 | } | |
3672 | ||
3673 | static ssize_t | |
3674 | sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len) | |
3675 | { | |
3676 | long n; | |
3677 | ||
3678 | if (strict_strtol(buf, 10, &n)) | |
3679 | return -EINVAL; | |
3680 | ||
3681 | if (n != 0 && n != 1) | |
3682 | return -EINVAL; | |
3683 | ||
3684 | mddev->parallel_resync = n; | |
3685 | ||
3686 | if (mddev->sync_thread) | |
3687 | wake_up(&resync_wait); | |
3688 | ||
3689 | return len; | |
3690 | } | |
3691 | ||
3692 | /* force parallel resync, even with shared block devices */ | |
3693 | static struct md_sysfs_entry md_sync_force_parallel = | |
3694 | __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR, | |
3695 | sync_force_parallel_show, sync_force_parallel_store); | |
3696 | ||
88202a0c N |
3697 | static ssize_t |
3698 | sync_speed_show(mddev_t *mddev, char *page) | |
3699 | { | |
3700 | unsigned long resync, dt, db; | |
d1a7c503 N |
3701 | if (mddev->curr_resync == 0) |
3702 | return sprintf(page, "none\n"); | |
9687a60c AN |
3703 | resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active); |
3704 | dt = (jiffies - mddev->resync_mark) / HZ; | |
88202a0c | 3705 | if (!dt) dt++; |
9687a60c AN |
3706 | db = resync - mddev->resync_mark_cnt; |
3707 | return sprintf(page, "%lu\n", db/dt/2); /* K/sec */ | |
88202a0c N |
3708 | } |
3709 | ||
80ca3a44 | 3710 | static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed); |
88202a0c N |
3711 | |
3712 | static ssize_t | |
3713 | sync_completed_show(mddev_t *mddev, char *page) | |
3714 | { | |
58c0fed4 | 3715 | unsigned long max_sectors, resync; |
88202a0c | 3716 | |
acb180b0 N |
3717 | if (!test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3718 | return sprintf(page, "none\n"); | |
3719 | ||
88202a0c | 3720 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
58c0fed4 | 3721 | max_sectors = mddev->resync_max_sectors; |
88202a0c | 3722 | else |
58c0fed4 | 3723 | max_sectors = mddev->dev_sectors; |
88202a0c | 3724 | |
acb180b0 | 3725 | resync = mddev->curr_resync_completed; |
58c0fed4 | 3726 | return sprintf(page, "%lu / %lu\n", resync, max_sectors); |
88202a0c N |
3727 | } |
3728 | ||
80ca3a44 | 3729 | static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed); |
88202a0c | 3730 | |
5e96ee65 NB |
3731 | static ssize_t |
3732 | min_sync_show(mddev_t *mddev, char *page) | |
3733 | { | |
3734 | return sprintf(page, "%llu\n", | |
3735 | (unsigned long long)mddev->resync_min); | |
3736 | } | |
3737 | static ssize_t | |
3738 | min_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3739 | { | |
3740 | unsigned long long min; | |
3741 | if (strict_strtoull(buf, 10, &min)) | |
3742 | return -EINVAL; | |
3743 | if (min > mddev->resync_max) | |
3744 | return -EINVAL; | |
3745 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) | |
3746 | return -EBUSY; | |
3747 | ||
3748 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3749 | if (mddev->chunk_sectors) { |
2ac06c33 | 3750 | sector_t temp = min; |
9d8f0363 | 3751 | if (sector_div(temp, mddev->chunk_sectors)) |
5e96ee65 NB |
3752 | return -EINVAL; |
3753 | } | |
3754 | mddev->resync_min = min; | |
3755 | ||
3756 | return len; | |
3757 | } | |
3758 | ||
3759 | static struct md_sysfs_entry md_min_sync = | |
3760 | __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store); | |
3761 | ||
c6207277 N |
3762 | static ssize_t |
3763 | max_sync_show(mddev_t *mddev, char *page) | |
3764 | { | |
3765 | if (mddev->resync_max == MaxSector) | |
3766 | return sprintf(page, "max\n"); | |
3767 | else | |
3768 | return sprintf(page, "%llu\n", | |
3769 | (unsigned long long)mddev->resync_max); | |
3770 | } | |
3771 | static ssize_t | |
3772 | max_sync_store(mddev_t *mddev, const char *buf, size_t len) | |
3773 | { | |
3774 | if (strncmp(buf, "max", 3) == 0) | |
3775 | mddev->resync_max = MaxSector; | |
3776 | else { | |
5e96ee65 NB |
3777 | unsigned long long max; |
3778 | if (strict_strtoull(buf, 10, &max)) | |
3779 | return -EINVAL; | |
3780 | if (max < mddev->resync_min) | |
c6207277 N |
3781 | return -EINVAL; |
3782 | if (max < mddev->resync_max && | |
4d484a4a | 3783 | mddev->ro == 0 && |
c6207277 N |
3784 | test_bit(MD_RECOVERY_RUNNING, &mddev->recovery)) |
3785 | return -EBUSY; | |
3786 | ||
3787 | /* Must be a multiple of chunk_size */ | |
9d8f0363 | 3788 | if (mddev->chunk_sectors) { |
2ac06c33 | 3789 | sector_t temp = max; |
9d8f0363 | 3790 | if (sector_div(temp, mddev->chunk_sectors)) |
c6207277 N |
3791 | return -EINVAL; |
3792 | } | |
3793 | mddev->resync_max = max; | |
3794 | } | |
3795 | wake_up(&mddev->recovery_wait); | |
3796 | return len; | |
3797 | } | |
3798 | ||
3799 | static struct md_sysfs_entry md_max_sync = | |
3800 | __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store); | |
3801 | ||
e464eafd N |
3802 | static ssize_t |
3803 | suspend_lo_show(mddev_t *mddev, char *page) | |
3804 | { | |
3805 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo); | |
3806 | } | |
3807 | ||
3808 | static ssize_t | |
3809 | suspend_lo_store(mddev_t *mddev, const char *buf, size_t len) | |
3810 | { | |
3811 | char *e; | |
3812 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3813 | ||
b8d966ef N |
3814 | if (mddev->pers == NULL || |
3815 | mddev->pers->quiesce == NULL) | |
e464eafd N |
3816 | return -EINVAL; |
3817 | if (buf == e || (*e && *e != '\n')) | |
3818 | return -EINVAL; | |
3819 | if (new >= mddev->suspend_hi || | |
3820 | (new > mddev->suspend_lo && new < mddev->suspend_hi)) { | |
3821 | mddev->suspend_lo = new; | |
3822 | mddev->pers->quiesce(mddev, 2); | |
3823 | return len; | |
3824 | } else | |
3825 | return -EINVAL; | |
3826 | } | |
3827 | static struct md_sysfs_entry md_suspend_lo = | |
3828 | __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store); | |
3829 | ||
3830 | ||
3831 | static ssize_t | |
3832 | suspend_hi_show(mddev_t *mddev, char *page) | |
3833 | { | |
3834 | return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi); | |
3835 | } | |
3836 | ||
3837 | static ssize_t | |
3838 | suspend_hi_store(mddev_t *mddev, const char *buf, size_t len) | |
3839 | { | |
3840 | char *e; | |
3841 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3842 | ||
b8d966ef N |
3843 | if (mddev->pers == NULL || |
3844 | mddev->pers->quiesce == NULL) | |
e464eafd N |
3845 | return -EINVAL; |
3846 | if (buf == e || (*e && *e != '\n')) | |
3847 | return -EINVAL; | |
3848 | if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) || | |
3849 | (new > mddev->suspend_lo && new > mddev->suspend_hi)) { | |
3850 | mddev->suspend_hi = new; | |
3851 | mddev->pers->quiesce(mddev, 1); | |
3852 | mddev->pers->quiesce(mddev, 0); | |
3853 | return len; | |
3854 | } else | |
3855 | return -EINVAL; | |
3856 | } | |
3857 | static struct md_sysfs_entry md_suspend_hi = | |
3858 | __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store); | |
3859 | ||
08a02ecd N |
3860 | static ssize_t |
3861 | reshape_position_show(mddev_t *mddev, char *page) | |
3862 | { | |
3863 | if (mddev->reshape_position != MaxSector) | |
3864 | return sprintf(page, "%llu\n", | |
3865 | (unsigned long long)mddev->reshape_position); | |
3866 | strcpy(page, "none\n"); | |
3867 | return 5; | |
3868 | } | |
3869 | ||
3870 | static ssize_t | |
3871 | reshape_position_store(mddev_t *mddev, const char *buf, size_t len) | |
3872 | { | |
3873 | char *e; | |
3874 | unsigned long long new = simple_strtoull(buf, &e, 10); | |
3875 | if (mddev->pers) | |
3876 | return -EBUSY; | |
3877 | if (buf == e || (*e && *e != '\n')) | |
3878 | return -EINVAL; | |
3879 | mddev->reshape_position = new; | |
3880 | mddev->delta_disks = 0; | |
3881 | mddev->new_level = mddev->level; | |
3882 | mddev->new_layout = mddev->layout; | |
664e7c41 | 3883 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
08a02ecd N |
3884 | return len; |
3885 | } | |
3886 | ||
3887 | static struct md_sysfs_entry md_reshape_position = | |
3888 | __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show, | |
3889 | reshape_position_store); | |
3890 | ||
b522adcd DW |
3891 | static ssize_t |
3892 | array_size_show(mddev_t *mddev, char *page) | |
3893 | { | |
3894 | if (mddev->external_size) | |
3895 | return sprintf(page, "%llu\n", | |
3896 | (unsigned long long)mddev->array_sectors/2); | |
3897 | else | |
3898 | return sprintf(page, "default\n"); | |
3899 | } | |
3900 | ||
3901 | static ssize_t | |
3902 | array_size_store(mddev_t *mddev, const char *buf, size_t len) | |
3903 | { | |
3904 | sector_t sectors; | |
3905 | ||
3906 | if (strncmp(buf, "default", 7) == 0) { | |
3907 | if (mddev->pers) | |
3908 | sectors = mddev->pers->size(mddev, 0, 0); | |
3909 | else | |
3910 | sectors = mddev->array_sectors; | |
3911 | ||
3912 | mddev->external_size = 0; | |
3913 | } else { | |
3914 | if (strict_blocks_to_sectors(buf, §ors) < 0) | |
3915 | return -EINVAL; | |
3916 | if (mddev->pers && mddev->pers->size(mddev, 0, 0) < sectors) | |
2b69c839 | 3917 | return -E2BIG; |
b522adcd DW |
3918 | |
3919 | mddev->external_size = 1; | |
3920 | } | |
3921 | ||
3922 | mddev->array_sectors = sectors; | |
3923 | set_capacity(mddev->gendisk, mddev->array_sectors); | |
449aad3e N |
3924 | if (mddev->pers) |
3925 | revalidate_disk(mddev->gendisk); | |
b522adcd DW |
3926 | |
3927 | return len; | |
3928 | } | |
3929 | ||
3930 | static struct md_sysfs_entry md_array_size = | |
3931 | __ATTR(array_size, S_IRUGO|S_IWUSR, array_size_show, | |
3932 | array_size_store); | |
e464eafd | 3933 | |
eae1701f N |
3934 | static struct attribute *md_default_attrs[] = { |
3935 | &md_level.attr, | |
d4dbd025 | 3936 | &md_layout.attr, |
eae1701f | 3937 | &md_raid_disks.attr, |
3b34380a | 3938 | &md_chunk_size.attr, |
a35b0d69 | 3939 | &md_size.attr, |
a94213b1 | 3940 | &md_resync_start.attr, |
8bb93aac | 3941 | &md_metadata.attr, |
6d7ff738 | 3942 | &md_new_device.attr, |
16f17b39 | 3943 | &md_safe_delay.attr, |
9e653b63 | 3944 | &md_array_state.attr, |
08a02ecd | 3945 | &md_reshape_position.attr, |
b522adcd | 3946 | &md_array_size.attr, |
1e50915f | 3947 | &max_corr_read_errors.attr, |
411036fa N |
3948 | NULL, |
3949 | }; | |
3950 | ||
3951 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 3952 | &md_scan_mode.attr, |
9d88883e | 3953 | &md_mismatches.attr, |
88202a0c N |
3954 | &md_sync_min.attr, |
3955 | &md_sync_max.attr, | |
3956 | &md_sync_speed.attr, | |
90b08710 | 3957 | &md_sync_force_parallel.attr, |
88202a0c | 3958 | &md_sync_completed.attr, |
5e96ee65 | 3959 | &md_min_sync.attr, |
c6207277 | 3960 | &md_max_sync.attr, |
e464eafd N |
3961 | &md_suspend_lo.attr, |
3962 | &md_suspend_hi.attr, | |
9b1d1dac | 3963 | &md_bitmap.attr, |
d7f3d291 | 3964 | &md_degraded.attr, |
eae1701f N |
3965 | NULL, |
3966 | }; | |
411036fa N |
3967 | static struct attribute_group md_redundancy_group = { |
3968 | .name = NULL, | |
3969 | .attrs = md_redundancy_attrs, | |
3970 | }; | |
3971 | ||
eae1701f N |
3972 | |
3973 | static ssize_t | |
3974 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
3975 | { | |
3976 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3977 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3978 | ssize_t rv; |
eae1701f N |
3979 | |
3980 | if (!entry->show) | |
3981 | return -EIO; | |
5dc5cf7d IM |
3982 | rv = mddev_lock(mddev); |
3983 | if (!rv) { | |
3984 | rv = entry->show(mddev, page); | |
3985 | mddev_unlock(mddev); | |
3986 | } | |
96de1e66 | 3987 | return rv; |
eae1701f N |
3988 | } |
3989 | ||
3990 | static ssize_t | |
3991 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
3992 | const char *page, size_t length) | |
3993 | { | |
3994 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
3995 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 3996 | ssize_t rv; |
eae1701f N |
3997 | |
3998 | if (!entry->store) | |
3999 | return -EIO; | |
67463acb N |
4000 | if (!capable(CAP_SYS_ADMIN)) |
4001 | return -EACCES; | |
5dc5cf7d | 4002 | rv = mddev_lock(mddev); |
d3374825 N |
4003 | if (mddev->hold_active == UNTIL_IOCTL) |
4004 | mddev->hold_active = 0; | |
5dc5cf7d IM |
4005 | if (!rv) { |
4006 | rv = entry->store(mddev, page, length); | |
4007 | mddev_unlock(mddev); | |
4008 | } | |
96de1e66 | 4009 | return rv; |
eae1701f N |
4010 | } |
4011 | ||
4012 | static void md_free(struct kobject *ko) | |
4013 | { | |
4014 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
a21d1504 N |
4015 | |
4016 | if (mddev->sysfs_state) | |
4017 | sysfs_put(mddev->sysfs_state); | |
4018 | ||
4019 | if (mddev->gendisk) { | |
4020 | del_gendisk(mddev->gendisk); | |
4021 | put_disk(mddev->gendisk); | |
4022 | } | |
4023 | if (mddev->queue) | |
4024 | blk_cleanup_queue(mddev->queue); | |
4025 | ||
eae1701f N |
4026 | kfree(mddev); |
4027 | } | |
4028 | ||
4029 | static struct sysfs_ops md_sysfs_ops = { | |
4030 | .show = md_attr_show, | |
4031 | .store = md_attr_store, | |
4032 | }; | |
4033 | static struct kobj_type md_ktype = { | |
4034 | .release = md_free, | |
4035 | .sysfs_ops = &md_sysfs_ops, | |
4036 | .default_attrs = md_default_attrs, | |
4037 | }; | |
4038 | ||
1da177e4 LT |
4039 | int mdp_major = 0; |
4040 | ||
5fd3a17e DW |
4041 | static void mddev_delayed_delete(struct work_struct *ws) |
4042 | { | |
4043 | mddev_t *mddev = container_of(ws, mddev_t, del_work); | |
4044 | ||
4045 | if (mddev->private == &md_redundancy_group) { | |
4046 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
4047 | if (mddev->sysfs_action) | |
4048 | sysfs_put(mddev->sysfs_action); | |
4049 | mddev->sysfs_action = NULL; | |
4050 | mddev->private = NULL; | |
4051 | } | |
43a70507 | 4052 | sysfs_remove_group(&mddev->kobj, &md_bitmap_group); |
5fd3a17e DW |
4053 | kobject_del(&mddev->kobj); |
4054 | kobject_put(&mddev->kobj); | |
4055 | } | |
4056 | ||
efeb53c0 | 4057 | static int md_alloc(dev_t dev, char *name) |
1da177e4 | 4058 | { |
48c9c27b | 4059 | static DEFINE_MUTEX(disks_mutex); |
1da177e4 LT |
4060 | mddev_t *mddev = mddev_find(dev); |
4061 | struct gendisk *disk; | |
efeb53c0 N |
4062 | int partitioned; |
4063 | int shift; | |
4064 | int unit; | |
3830c62f | 4065 | int error; |
1da177e4 LT |
4066 | |
4067 | if (!mddev) | |
efeb53c0 N |
4068 | return -ENODEV; |
4069 | ||
4070 | partitioned = (MAJOR(mddev->unit) != MD_MAJOR); | |
4071 | shift = partitioned ? MdpMinorShift : 0; | |
4072 | unit = MINOR(mddev->unit) >> shift; | |
1da177e4 | 4073 | |
d3374825 N |
4074 | /* wait for any previous instance if this device |
4075 | * to be completed removed (mddev_delayed_delete). | |
4076 | */ | |
4077 | flush_scheduled_work(); | |
4078 | ||
48c9c27b | 4079 | mutex_lock(&disks_mutex); |
0909dc44 N |
4080 | error = -EEXIST; |
4081 | if (mddev->gendisk) | |
4082 | goto abort; | |
efeb53c0 N |
4083 | |
4084 | if (name) { | |
4085 | /* Need to ensure that 'name' is not a duplicate. | |
4086 | */ | |
4087 | mddev_t *mddev2; | |
4088 | spin_lock(&all_mddevs_lock); | |
4089 | ||
4090 | list_for_each_entry(mddev2, &all_mddevs, all_mddevs) | |
4091 | if (mddev2->gendisk && | |
4092 | strcmp(mddev2->gendisk->disk_name, name) == 0) { | |
4093 | spin_unlock(&all_mddevs_lock); | |
0909dc44 | 4094 | goto abort; |
efeb53c0 N |
4095 | } |
4096 | spin_unlock(&all_mddevs_lock); | |
1da177e4 | 4097 | } |
8b765398 | 4098 | |
0909dc44 | 4099 | error = -ENOMEM; |
8b765398 | 4100 | mddev->queue = blk_alloc_queue(GFP_KERNEL); |
0909dc44 N |
4101 | if (!mddev->queue) |
4102 | goto abort; | |
409c57f3 N |
4103 | mddev->queue->queuedata = mddev; |
4104 | ||
8b765398 N |
4105 | /* Can be unlocked because the queue is new: no concurrency */ |
4106 | queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue); | |
4107 | ||
409c57f3 | 4108 | blk_queue_make_request(mddev->queue, md_make_request); |
8b765398 | 4109 | |
1da177e4 LT |
4110 | disk = alloc_disk(1 << shift); |
4111 | if (!disk) { | |
8b765398 N |
4112 | blk_cleanup_queue(mddev->queue); |
4113 | mddev->queue = NULL; | |
0909dc44 | 4114 | goto abort; |
1da177e4 | 4115 | } |
efeb53c0 | 4116 | disk->major = MAJOR(mddev->unit); |
1da177e4 | 4117 | disk->first_minor = unit << shift; |
efeb53c0 N |
4118 | if (name) |
4119 | strcpy(disk->disk_name, name); | |
4120 | else if (partitioned) | |
1da177e4 | 4121 | sprintf(disk->disk_name, "md_d%d", unit); |
ce7b0f46 | 4122 | else |
1da177e4 | 4123 | sprintf(disk->disk_name, "md%d", unit); |
1da177e4 LT |
4124 | disk->fops = &md_fops; |
4125 | disk->private_data = mddev; | |
4126 | disk->queue = mddev->queue; | |
92850bbd | 4127 | /* Allow extended partitions. This makes the |
d3374825 | 4128 | * 'mdp' device redundant, but we can't really |
92850bbd N |
4129 | * remove it now. |
4130 | */ | |
4131 | disk->flags |= GENHD_FL_EXT_DEVT; | |
1da177e4 LT |
4132 | add_disk(disk); |
4133 | mddev->gendisk = disk; | |
ed9e1982 TH |
4134 | error = kobject_init_and_add(&mddev->kobj, &md_ktype, |
4135 | &disk_to_dev(disk)->kobj, "%s", "md"); | |
0909dc44 N |
4136 | if (error) { |
4137 | /* This isn't possible, but as kobject_init_and_add is marked | |
4138 | * __must_check, we must do something with the result | |
4139 | */ | |
5e55e2f5 N |
4140 | printk(KERN_WARNING "md: cannot register %s/md - name in use\n", |
4141 | disk->disk_name); | |
0909dc44 N |
4142 | error = 0; |
4143 | } | |
43a70507 N |
4144 | if (sysfs_create_group(&mddev->kobj, &md_bitmap_group)) |
4145 | printk(KERN_DEBUG "pointless warning\n"); | |
0909dc44 N |
4146 | abort: |
4147 | mutex_unlock(&disks_mutex); | |
4148 | if (!error) { | |
3830c62f | 4149 | kobject_uevent(&mddev->kobj, KOBJ_ADD); |
b62b7590 N |
4150 | mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state"); |
4151 | } | |
d3374825 | 4152 | mddev_put(mddev); |
0909dc44 | 4153 | return error; |
efeb53c0 N |
4154 | } |
4155 | ||
4156 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
4157 | { | |
4158 | md_alloc(dev, NULL); | |
1da177e4 LT |
4159 | return NULL; |
4160 | } | |
4161 | ||
efeb53c0 N |
4162 | static int add_named_array(const char *val, struct kernel_param *kp) |
4163 | { | |
4164 | /* val must be "md_*" where * is not all digits. | |
4165 | * We allocate an array with a large free minor number, and | |
4166 | * set the name to val. val must not already be an active name. | |
4167 | */ | |
4168 | int len = strlen(val); | |
4169 | char buf[DISK_NAME_LEN]; | |
4170 | ||
4171 | while (len && val[len-1] == '\n') | |
4172 | len--; | |
4173 | if (len >= DISK_NAME_LEN) | |
4174 | return -E2BIG; | |
4175 | strlcpy(buf, val, len+1); | |
4176 | if (strncmp(buf, "md_", 3) != 0) | |
4177 | return -EINVAL; | |
4178 | return md_alloc(0, buf); | |
4179 | } | |
4180 | ||
1da177e4 LT |
4181 | static void md_safemode_timeout(unsigned long data) |
4182 | { | |
4183 | mddev_t *mddev = (mddev_t *) data; | |
4184 | ||
0fd62b86 NB |
4185 | if (!atomic_read(&mddev->writes_pending)) { |
4186 | mddev->safemode = 1; | |
4187 | if (mddev->external) | |
b62b7590 | 4188 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 | 4189 | } |
1da177e4 LT |
4190 | md_wakeup_thread(mddev->thread); |
4191 | } | |
4192 | ||
6ff8d8ec | 4193 | static int start_dirty_degraded; |
1da177e4 LT |
4194 | |
4195 | static int do_md_run(mddev_t * mddev) | |
4196 | { | |
2604b703 | 4197 | int err; |
1da177e4 LT |
4198 | mdk_rdev_t *rdev; |
4199 | struct gendisk *disk; | |
2604b703 | 4200 | struct mdk_personality *pers; |
1da177e4 | 4201 | |
a757e64c N |
4202 | if (list_empty(&mddev->disks)) |
4203 | /* cannot run an array with no devices.. */ | |
1da177e4 | 4204 | return -EINVAL; |
1da177e4 LT |
4205 | |
4206 | if (mddev->pers) | |
4207 | return -EBUSY; | |
4208 | ||
4209 | /* | |
4210 | * Analyze all RAID superblock(s) | |
4211 | */ | |
1ec4a939 N |
4212 | if (!mddev->raid_disks) { |
4213 | if (!mddev->persistent) | |
4214 | return -EINVAL; | |
a757e64c | 4215 | analyze_sbs(mddev); |
1ec4a939 | 4216 | } |
1da177e4 | 4217 | |
d9d166c2 N |
4218 | if (mddev->level != LEVEL_NONE) |
4219 | request_module("md-level-%d", mddev->level); | |
4220 | else if (mddev->clevel[0]) | |
4221 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
4222 | |
4223 | /* | |
4224 | * Drop all container device buffers, from now on | |
4225 | * the only valid external interface is through the md | |
4226 | * device. | |
1da177e4 | 4227 | */ |
159ec1fc | 4228 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
b2d444d7 | 4229 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4230 | continue; |
4231 | sync_blockdev(rdev->bdev); | |
f98393a6 | 4232 | invalidate_bdev(rdev->bdev); |
f0d76d70 N |
4233 | |
4234 | /* perform some consistency tests on the device. | |
4235 | * We don't want the data to overlap the metadata, | |
58c0fed4 | 4236 | * Internal Bitmap issues have been handled elsewhere. |
f0d76d70 | 4237 | */ |
0f420358 | 4238 | if (rdev->data_offset < rdev->sb_start) { |
58c0fed4 AN |
4239 | if (mddev->dev_sectors && |
4240 | rdev->data_offset + mddev->dev_sectors | |
0f420358 | 4241 | > rdev->sb_start) { |
f0d76d70 N |
4242 | printk("md: %s: data overlaps metadata\n", |
4243 | mdname(mddev)); | |
4244 | return -EINVAL; | |
4245 | } | |
4246 | } else { | |
0f420358 | 4247 | if (rdev->sb_start + rdev->sb_size/512 |
f0d76d70 N |
4248 | > rdev->data_offset) { |
4249 | printk("md: %s: metadata overlaps data\n", | |
4250 | mdname(mddev)); | |
4251 | return -EINVAL; | |
4252 | } | |
4253 | } | |
3c0ee63a | 4254 | sysfs_notify_dirent(rdev->sysfs_state); |
1da177e4 LT |
4255 | } |
4256 | ||
4257 | md_probe(mddev->unit, NULL, NULL); | |
4258 | disk = mddev->gendisk; | |
4259 | if (!disk) | |
4260 | return -ENOMEM; | |
4261 | ||
4262 | spin_lock(&pers_lock); | |
d9d166c2 | 4263 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 4264 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 4265 | spin_unlock(&pers_lock); |
d9d166c2 N |
4266 | if (mddev->level != LEVEL_NONE) |
4267 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
4268 | mddev->level); | |
4269 | else | |
4270 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
4271 | mddev->clevel); | |
1da177e4 LT |
4272 | return -EINVAL; |
4273 | } | |
2604b703 | 4274 | mddev->pers = pers; |
1da177e4 | 4275 | spin_unlock(&pers_lock); |
34817e8c N |
4276 | if (mddev->level != pers->level) { |
4277 | mddev->level = pers->level; | |
4278 | mddev->new_level = pers->level; | |
4279 | } | |
d9d166c2 | 4280 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); |
1da177e4 | 4281 | |
f6705578 | 4282 | if (mddev->reshape_position != MaxSector && |
63c70c4f | 4283 | pers->start_reshape == NULL) { |
f6705578 N |
4284 | /* This personality cannot handle reshaping... */ |
4285 | mddev->pers = NULL; | |
4286 | module_put(pers->owner); | |
4287 | return -EINVAL; | |
4288 | } | |
4289 | ||
7dd5e7c3 N |
4290 | if (pers->sync_request) { |
4291 | /* Warn if this is a potentially silly | |
4292 | * configuration. | |
4293 | */ | |
4294 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4295 | mdk_rdev_t *rdev2; | |
7dd5e7c3 | 4296 | int warned = 0; |
159ec1fc CR |
4297 | |
4298 | list_for_each_entry(rdev, &mddev->disks, same_set) | |
4299 | list_for_each_entry(rdev2, &mddev->disks, same_set) { | |
7dd5e7c3 N |
4300 | if (rdev < rdev2 && |
4301 | rdev->bdev->bd_contains == | |
4302 | rdev2->bdev->bd_contains) { | |
4303 | printk(KERN_WARNING | |
4304 | "%s: WARNING: %s appears to be" | |
4305 | " on the same physical disk as" | |
4306 | " %s.\n", | |
4307 | mdname(mddev), | |
4308 | bdevname(rdev->bdev,b), | |
4309 | bdevname(rdev2->bdev,b2)); | |
4310 | warned = 1; | |
4311 | } | |
4312 | } | |
159ec1fc | 4313 | |
7dd5e7c3 N |
4314 | if (warned) |
4315 | printk(KERN_WARNING | |
4316 | "True protection against single-disk" | |
4317 | " failure might be compromised.\n"); | |
4318 | } | |
4319 | ||
657390d2 | 4320 | mddev->recovery = 0; |
58c0fed4 AN |
4321 | /* may be over-ridden by personality */ |
4322 | mddev->resync_max_sectors = mddev->dev_sectors; | |
4323 | ||
a9701a30 | 4324 | mddev->barriers_work = 1; |
6ff8d8ec | 4325 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 4326 | |
f91de92e N |
4327 | if (start_readonly) |
4328 | mddev->ro = 2; /* read-only, but switch on first write */ | |
4329 | ||
b15c2e57 | 4330 | err = mddev->pers->run(mddev); |
13e53df3 AN |
4331 | if (err) |
4332 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
b522adcd DW |
4333 | else if (mddev->pers->size(mddev, 0, 0) < mddev->array_sectors) { |
4334 | WARN_ONCE(!mddev->external_size, "%s: default size too small," | |
4335 | " but 'external_size' not in effect?\n", __func__); | |
4336 | printk(KERN_ERR | |
4337 | "md: invalid array_size %llu > default size %llu\n", | |
4338 | (unsigned long long)mddev->array_sectors / 2, | |
4339 | (unsigned long long)mddev->pers->size(mddev, 0, 0) / 2); | |
4340 | err = -EINVAL; | |
4341 | mddev->pers->stop(mddev); | |
4342 | } | |
4343 | if (err == 0 && mddev->pers->sync_request) { | |
b15c2e57 N |
4344 | err = bitmap_create(mddev); |
4345 | if (err) { | |
4346 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
4347 | mdname(mddev), err); | |
4348 | mddev->pers->stop(mddev); | |
4349 | } | |
4350 | } | |
1da177e4 | 4351 | if (err) { |
1da177e4 LT |
4352 | module_put(mddev->pers->owner); |
4353 | mddev->pers = NULL; | |
32a7627c N |
4354 | bitmap_destroy(mddev); |
4355 | return err; | |
1da177e4 | 4356 | } |
5e55e2f5 N |
4357 | if (mddev->pers->sync_request) { |
4358 | if (sysfs_create_group(&mddev->kobj, &md_redundancy_group)) | |
4359 | printk(KERN_WARNING | |
4360 | "md: cannot register extra attributes for %s\n", | |
4361 | mdname(mddev)); | |
0c3573f1 | 4362 | mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action"); |
5e55e2f5 | 4363 | } else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
fd9d49ca N |
4364 | mddev->ro = 0; |
4365 | ||
1da177e4 | 4366 | atomic_set(&mddev->writes_pending,0); |
1e50915f RB |
4367 | atomic_set(&mddev->max_corr_read_errors, |
4368 | MD_DEFAULT_MAX_CORRECTED_READ_ERRORS); | |
1da177e4 LT |
4369 | mddev->safemode = 0; |
4370 | mddev->safemode_timer.function = md_safemode_timeout; | |
4371 | mddev->safemode_timer.data = (unsigned long) mddev; | |
16f17b39 | 4372 | mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */ |
1da177e4 | 4373 | mddev->in_sync = 1; |
86e6ffdd | 4374 | |
159ec1fc | 4375 | list_for_each_entry(rdev, &mddev->disks, same_set) |
86e6ffdd N |
4376 | if (rdev->raid_disk >= 0) { |
4377 | char nm[20]; | |
4378 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
4379 | if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm)) |
4380 | printk("md: cannot register %s for %s\n", | |
4381 | nm, mdname(mddev)); | |
86e6ffdd | 4382 | } |
1da177e4 LT |
4383 | |
4384 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4385 | ||
850b2b42 N |
4386 | if (mddev->flags) |
4387 | md_update_sb(mddev, 0); | |
1da177e4 | 4388 | |
f233ea5c | 4389 | set_capacity(disk, mddev->array_sectors); |
1da177e4 | 4390 | |
5fd6c1dc N |
4391 | /* If there is a partially-recovered drive we need to |
4392 | * start recovery here. If we leave it to md_check_recovery, | |
4393 | * it will remove the drives and not do the right thing | |
4394 | */ | |
0b8c9de0 | 4395 | if (mddev->degraded && !mddev->sync_thread) { |
5fd6c1dc | 4396 | int spares = 0; |
159ec1fc | 4397 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
4398 | if (rdev->raid_disk >= 0 && |
4399 | !test_bit(In_sync, &rdev->flags) && | |
4400 | !test_bit(Faulty, &rdev->flags)) | |
4401 | /* complete an interrupted recovery */ | |
4402 | spares++; | |
4403 | if (spares && mddev->pers->sync_request) { | |
4404 | mddev->recovery = 0; | |
4405 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
4406 | mddev->sync_thread = md_register_thread(md_do_sync, | |
4407 | mddev, | |
0da3c619 | 4408 | "resync"); |
5fd6c1dc N |
4409 | if (!mddev->sync_thread) { |
4410 | printk(KERN_ERR "%s: could not start resync" | |
4411 | " thread...\n", | |
4412 | mdname(mddev)); | |
4413 | /* leave the spares where they are, it shouldn't hurt */ | |
4414 | mddev->recovery = 0; | |
0b8c9de0 | 4415 | } |
5fd6c1dc N |
4416 | } |
4417 | } | |
0b8c9de0 N |
4418 | md_wakeup_thread(mddev->thread); |
4419 | md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */ | |
5fd6c1dc | 4420 | |
449aad3e | 4421 | revalidate_disk(mddev->gendisk); |
44ce6294 | 4422 | mddev->changed = 1; |
d7603b7e | 4423 | md_new_event(mddev); |
b62b7590 | 4424 | sysfs_notify_dirent(mddev->sysfs_state); |
0c3573f1 N |
4425 | if (mddev->sysfs_action) |
4426 | sysfs_notify_dirent(mddev->sysfs_action); | |
a99ac971 | 4427 | sysfs_notify(&mddev->kobj, NULL, "degraded"); |
ed9e1982 | 4428 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
1da177e4 LT |
4429 | return 0; |
4430 | } | |
4431 | ||
4432 | static int restart_array(mddev_t *mddev) | |
4433 | { | |
4434 | struct gendisk *disk = mddev->gendisk; | |
1da177e4 | 4435 | |
80fab1d7 | 4436 | /* Complain if it has no devices */ |
1da177e4 | 4437 | if (list_empty(&mddev->disks)) |
80fab1d7 AN |
4438 | return -ENXIO; |
4439 | if (!mddev->pers) | |
4440 | return -EINVAL; | |
4441 | if (!mddev->ro) | |
4442 | return -EBUSY; | |
4443 | mddev->safemode = 0; | |
4444 | mddev->ro = 0; | |
4445 | set_disk_ro(disk, 0); | |
4446 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
4447 | mdname(mddev)); | |
4448 | /* Kick recovery or resync if necessary */ | |
4449 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4450 | md_wakeup_thread(mddev->thread); | |
4451 | md_wakeup_thread(mddev->sync_thread); | |
b62b7590 | 4452 | sysfs_notify_dirent(mddev->sysfs_state); |
80fab1d7 | 4453 | return 0; |
1da177e4 LT |
4454 | } |
4455 | ||
acc55e22 N |
4456 | /* similar to deny_write_access, but accounts for our holding a reference |
4457 | * to the file ourselves */ | |
4458 | static int deny_bitmap_write_access(struct file * file) | |
4459 | { | |
4460 | struct inode *inode = file->f_mapping->host; | |
4461 | ||
4462 | spin_lock(&inode->i_lock); | |
4463 | if (atomic_read(&inode->i_writecount) > 1) { | |
4464 | spin_unlock(&inode->i_lock); | |
4465 | return -ETXTBSY; | |
4466 | } | |
4467 | atomic_set(&inode->i_writecount, -1); | |
4468 | spin_unlock(&inode->i_lock); | |
4469 | ||
4470 | return 0; | |
4471 | } | |
4472 | ||
43a70507 | 4473 | void restore_bitmap_write_access(struct file *file) |
acc55e22 N |
4474 | { |
4475 | struct inode *inode = file->f_mapping->host; | |
4476 | ||
4477 | spin_lock(&inode->i_lock); | |
4478 | atomic_set(&inode->i_writecount, 1); | |
4479 | spin_unlock(&inode->i_lock); | |
4480 | } | |
4481 | ||
9e653b63 N |
4482 | /* mode: |
4483 | * 0 - completely stop and dis-assemble array | |
4484 | * 1 - switch to readonly | |
4485 | * 2 - stop but do not disassemble array | |
4486 | */ | |
df5b20cf | 4487 | static int do_md_stop(mddev_t * mddev, int mode, int is_open) |
1da177e4 LT |
4488 | { |
4489 | int err = 0; | |
4490 | struct gendisk *disk = mddev->gendisk; | |
c4647292 | 4491 | mdk_rdev_t *rdev; |
1da177e4 | 4492 | |
c8c00a69 | 4493 | mutex_lock(&mddev->open_mutex); |
f2ea68cf | 4494 | if (atomic_read(&mddev->openers) > is_open) { |
df5b20cf | 4495 | printk("md: %s still in use.\n",mdname(mddev)); |
c8c00a69 N |
4496 | err = -EBUSY; |
4497 | } else if (mddev->pers) { | |
1da177e4 LT |
4498 | |
4499 | if (mddev->sync_thread) { | |
5fd6c1dc | 4500 | set_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
1da177e4 LT |
4501 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4502 | md_unregister_thread(mddev->sync_thread); | |
4503 | mddev->sync_thread = NULL; | |
4504 | } | |
4505 | ||
4506 | del_timer_sync(&mddev->safemode_timer); | |
4507 | ||
9e653b63 N |
4508 | switch(mode) { |
4509 | case 1: /* readonly */ | |
1da177e4 | 4510 | err = -ENXIO; |
f91de92e | 4511 | if (mddev->ro==1) |
1da177e4 LT |
4512 | goto out; |
4513 | mddev->ro = 1; | |
9e653b63 N |
4514 | break; |
4515 | case 0: /* disassemble */ | |
4516 | case 2: /* stop */ | |
6b8b3e8a | 4517 | bitmap_flush(mddev); |
a9701a30 | 4518 | md_super_wait(mddev); |
1da177e4 LT |
4519 | if (mddev->ro) |
4520 | set_disk_ro(disk, 0); | |
409c57f3 | 4521 | |
1da177e4 | 4522 | mddev->pers->stop(mddev); |
d1b5380c N |
4523 | mddev->queue->merge_bvec_fn = NULL; |
4524 | mddev->queue->unplug_fn = NULL; | |
041ae52e | 4525 | mddev->queue->backing_dev_info.congested_fn = NULL; |
1da177e4 | 4526 | module_put(mddev->pers->owner); |
5fd3a17e DW |
4527 | if (mddev->pers->sync_request) |
4528 | mddev->private = &md_redundancy_group; | |
1da177e4 | 4529 | mddev->pers = NULL; |
4f54b0e9 | 4530 | /* tell userspace to handle 'inactive' */ |
b62b7590 | 4531 | sysfs_notify_dirent(mddev->sysfs_state); |
0d4ca600 | 4532 | |
c4647292 N |
4533 | list_for_each_entry(rdev, &mddev->disks, same_set) |
4534 | if (rdev->raid_disk >= 0) { | |
4535 | char nm[20]; | |
4536 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4537 | sysfs_remove_link(&mddev->kobj, nm); | |
4538 | } | |
4539 | ||
0d4ca600 | 4540 | set_capacity(disk, 0); |
44ce6294 | 4541 | mddev->changed = 1; |
0d4ca600 | 4542 | |
1da177e4 LT |
4543 | if (mddev->ro) |
4544 | mddev->ro = 0; | |
4545 | } | |
850b2b42 | 4546 | if (!mddev->in_sync || mddev->flags) { |
1da177e4 LT |
4547 | /* mark array as shutdown cleanly */ |
4548 | mddev->in_sync = 1; | |
850b2b42 | 4549 | md_update_sb(mddev, 1); |
1da177e4 | 4550 | } |
9e653b63 | 4551 | if (mode == 1) |
1da177e4 | 4552 | set_disk_ro(disk, 1); |
5fd6c1dc | 4553 | clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery); |
80ffb3cc | 4554 | err = 0; |
1da177e4 | 4555 | } |
c8c00a69 N |
4556 | out: |
4557 | mutex_unlock(&mddev->open_mutex); | |
4558 | if (err) | |
4559 | return err; | |
1da177e4 LT |
4560 | /* |
4561 | * Free resources if final stop | |
4562 | */ | |
9e653b63 | 4563 | if (mode == 0) { |
0d4ca600 | 4564 | |
1da177e4 LT |
4565 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); |
4566 | ||
978f946b | 4567 | bitmap_destroy(mddev); |
c3d9714e N |
4568 | if (mddev->bitmap_info.file) { |
4569 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
4570 | fput(mddev->bitmap_info.file); | |
4571 | mddev->bitmap_info.file = NULL; | |
978f946b | 4572 | } |
c3d9714e | 4573 | mddev->bitmap_info.offset = 0; |
978f946b | 4574 | |
177a99b2 | 4575 | /* make sure all md_delayed_delete calls have finished */ |
5792a285 N |
4576 | flush_scheduled_work(); |
4577 | ||
1da177e4 LT |
4578 | export_array(mddev); |
4579 | ||
f233ea5c | 4580 | mddev->array_sectors = 0; |
b522adcd | 4581 | mddev->external_size = 0; |
58c0fed4 | 4582 | mddev->dev_sectors = 0; |
9e653b63 | 4583 | mddev->raid_disks = 0; |
a94213b1 | 4584 | mddev->recovery_cp = 0; |
5e96ee65 | 4585 | mddev->resync_min = 0; |
c6207277 | 4586 | mddev->resync_max = MaxSector; |
08a02ecd | 4587 | mddev->reshape_position = MaxSector; |
e691063a | 4588 | mddev->external = 0; |
1ec4a939 | 4589 | mddev->persistent = 0; |
d897dbf9 N |
4590 | mddev->level = LEVEL_NONE; |
4591 | mddev->clevel[0] = 0; | |
4592 | mddev->flags = 0; | |
4593 | mddev->ro = 0; | |
4594 | mddev->metadata_type[0] = 0; | |
9d8f0363 | 4595 | mddev->chunk_sectors = 0; |
d897dbf9 N |
4596 | mddev->ctime = mddev->utime = 0; |
4597 | mddev->layout = 0; | |
4598 | mddev->max_disks = 0; | |
4599 | mddev->events = 0; | |
4600 | mddev->delta_disks = 0; | |
4601 | mddev->new_level = LEVEL_NONE; | |
4602 | mddev->new_layout = 0; | |
664e7c41 | 4603 | mddev->new_chunk_sectors = 0; |
d897dbf9 N |
4604 | mddev->curr_resync = 0; |
4605 | mddev->resync_mismatches = 0; | |
4606 | mddev->suspend_lo = mddev->suspend_hi = 0; | |
4607 | mddev->sync_speed_min = mddev->sync_speed_max = 0; | |
4608 | mddev->recovery = 0; | |
4609 | mddev->in_sync = 0; | |
4610 | mddev->changed = 0; | |
4611 | mddev->degraded = 0; | |
4612 | mddev->barriers_work = 0; | |
4613 | mddev->safemode = 0; | |
c3d9714e N |
4614 | mddev->bitmap_info.offset = 0; |
4615 | mddev->bitmap_info.default_offset = 0; | |
42a04b50 N |
4616 | mddev->bitmap_info.chunksize = 0; |
4617 | mddev->bitmap_info.daemon_sleep = 0; | |
4618 | mddev->bitmap_info.max_write_behind = 0; | |
934d9c23 | 4619 | kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE); |
efeb53c0 N |
4620 | if (mddev->hold_active == UNTIL_STOP) |
4621 | mddev->hold_active = 0; | |
9e653b63 | 4622 | |
a8a55c38 | 4623 | } else if (mddev->pers) |
1da177e4 LT |
4624 | printk(KERN_INFO "md: %s switched to read-only mode.\n", |
4625 | mdname(mddev)); | |
4626 | err = 0; | |
3f9d99c1 | 4627 | blk_integrity_unregister(disk); |
d7603b7e | 4628 | md_new_event(mddev); |
b62b7590 | 4629 | sysfs_notify_dirent(mddev->sysfs_state); |
1da177e4 LT |
4630 | return err; |
4631 | } | |
4632 | ||
fdee8ae4 | 4633 | #ifndef MODULE |
1da177e4 LT |
4634 | static void autorun_array(mddev_t *mddev) |
4635 | { | |
4636 | mdk_rdev_t *rdev; | |
1da177e4 LT |
4637 | int err; |
4638 | ||
a757e64c | 4639 | if (list_empty(&mddev->disks)) |
1da177e4 | 4640 | return; |
1da177e4 LT |
4641 | |
4642 | printk(KERN_INFO "md: running: "); | |
4643 | ||
159ec1fc | 4644 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
4645 | char b[BDEVNAME_SIZE]; |
4646 | printk("<%s>", bdevname(rdev->bdev,b)); | |
4647 | } | |
4648 | printk("\n"); | |
4649 | ||
d710e138 | 4650 | err = do_md_run(mddev); |
1da177e4 LT |
4651 | if (err) { |
4652 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
d710e138 | 4653 | do_md_stop(mddev, 0, 0); |
1da177e4 LT |
4654 | } |
4655 | } | |
4656 | ||
4657 | /* | |
4658 | * lets try to run arrays based on all disks that have arrived | |
4659 | * until now. (those are in pending_raid_disks) | |
4660 | * | |
4661 | * the method: pick the first pending disk, collect all disks with | |
4662 | * the same UUID, remove all from the pending list and put them into | |
4663 | * the 'same_array' list. Then order this list based on superblock | |
4664 | * update time (freshest comes first), kick out 'old' disks and | |
4665 | * compare superblocks. If everything's fine then run it. | |
4666 | * | |
4667 | * If "unit" is allocated, then bump its reference count | |
4668 | */ | |
4669 | static void autorun_devices(int part) | |
4670 | { | |
159ec1fc | 4671 | mdk_rdev_t *rdev0, *rdev, *tmp; |
1da177e4 LT |
4672 | mddev_t *mddev; |
4673 | char b[BDEVNAME_SIZE]; | |
4674 | ||
4675 | printk(KERN_INFO "md: autorun ...\n"); | |
4676 | while (!list_empty(&pending_raid_disks)) { | |
e8703fe1 | 4677 | int unit; |
1da177e4 | 4678 | dev_t dev; |
ad01c9e3 | 4679 | LIST_HEAD(candidates); |
1da177e4 LT |
4680 | rdev0 = list_entry(pending_raid_disks.next, |
4681 | mdk_rdev_t, same_set); | |
4682 | ||
4683 | printk(KERN_INFO "md: considering %s ...\n", | |
4684 | bdevname(rdev0->bdev,b)); | |
4685 | INIT_LIST_HEAD(&candidates); | |
159ec1fc | 4686 | rdev_for_each_list(rdev, tmp, &pending_raid_disks) |
1da177e4 LT |
4687 | if (super_90_load(rdev, rdev0, 0) >= 0) { |
4688 | printk(KERN_INFO "md: adding %s ...\n", | |
4689 | bdevname(rdev->bdev,b)); | |
4690 | list_move(&rdev->same_set, &candidates); | |
4691 | } | |
4692 | /* | |
4693 | * now we have a set of devices, with all of them having | |
4694 | * mostly sane superblocks. It's time to allocate the | |
4695 | * mddev. | |
4696 | */ | |
e8703fe1 N |
4697 | if (part) { |
4698 | dev = MKDEV(mdp_major, | |
4699 | rdev0->preferred_minor << MdpMinorShift); | |
4700 | unit = MINOR(dev) >> MdpMinorShift; | |
4701 | } else { | |
4702 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
4703 | unit = MINOR(dev); | |
4704 | } | |
4705 | if (rdev0->preferred_minor != unit) { | |
1da177e4 LT |
4706 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", |
4707 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
4708 | break; | |
4709 | } | |
1da177e4 LT |
4710 | |
4711 | md_probe(dev, NULL, NULL); | |
4712 | mddev = mddev_find(dev); | |
9bbbca3a NB |
4713 | if (!mddev || !mddev->gendisk) { |
4714 | if (mddev) | |
4715 | mddev_put(mddev); | |
4716 | printk(KERN_ERR | |
1da177e4 LT |
4717 | "md: cannot allocate memory for md drive.\n"); |
4718 | break; | |
4719 | } | |
4720 | if (mddev_lock(mddev)) | |
4721 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
4722 | mdname(mddev)); | |
4723 | else if (mddev->raid_disks || mddev->major_version | |
4724 | || !list_empty(&mddev->disks)) { | |
4725 | printk(KERN_WARNING | |
4726 | "md: %s already running, cannot run %s\n", | |
4727 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
4728 | mddev_unlock(mddev); | |
4729 | } else { | |
4730 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
1ec4a939 | 4731 | mddev->persistent = 1; |
159ec1fc | 4732 | rdev_for_each_list(rdev, tmp, &candidates) { |
1da177e4 LT |
4733 | list_del_init(&rdev->same_set); |
4734 | if (bind_rdev_to_array(rdev, mddev)) | |
4735 | export_rdev(rdev); | |
4736 | } | |
4737 | autorun_array(mddev); | |
4738 | mddev_unlock(mddev); | |
4739 | } | |
4740 | /* on success, candidates will be empty, on error | |
4741 | * it won't... | |
4742 | */ | |
159ec1fc | 4743 | rdev_for_each_list(rdev, tmp, &candidates) { |
4b80991c | 4744 | list_del_init(&rdev->same_set); |
1da177e4 | 4745 | export_rdev(rdev); |
4b80991c | 4746 | } |
1da177e4 LT |
4747 | mddev_put(mddev); |
4748 | } | |
4749 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
4750 | } | |
fdee8ae4 | 4751 | #endif /* !MODULE */ |
1da177e4 | 4752 | |
1da177e4 LT |
4753 | static int get_version(void __user * arg) |
4754 | { | |
4755 | mdu_version_t ver; | |
4756 | ||
4757 | ver.major = MD_MAJOR_VERSION; | |
4758 | ver.minor = MD_MINOR_VERSION; | |
4759 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
4760 | ||
4761 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
4762 | return -EFAULT; | |
4763 | ||
4764 | return 0; | |
4765 | } | |
4766 | ||
4767 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
4768 | { | |
4769 | mdu_array_info_t info; | |
a9f326eb | 4770 | int nr,working,insync,failed,spare; |
1da177e4 | 4771 | mdk_rdev_t *rdev; |
1da177e4 | 4772 | |
a9f326eb | 4773 | nr=working=insync=failed=spare=0; |
159ec1fc | 4774 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 | 4775 | nr++; |
b2d444d7 | 4776 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
4777 | failed++; |
4778 | else { | |
4779 | working++; | |
b2d444d7 | 4780 | if (test_bit(In_sync, &rdev->flags)) |
a9f326eb | 4781 | insync++; |
1da177e4 LT |
4782 | else |
4783 | spare++; | |
4784 | } | |
4785 | } | |
4786 | ||
4787 | info.major_version = mddev->major_version; | |
4788 | info.minor_version = mddev->minor_version; | |
4789 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
4790 | info.ctime = mddev->ctime; | |
4791 | info.level = mddev->level; | |
58c0fed4 AN |
4792 | info.size = mddev->dev_sectors / 2; |
4793 | if (info.size != mddev->dev_sectors / 2) /* overflow */ | |
284ae7ca | 4794 | info.size = -1; |
1da177e4 LT |
4795 | info.nr_disks = nr; |
4796 | info.raid_disks = mddev->raid_disks; | |
4797 | info.md_minor = mddev->md_minor; | |
4798 | info.not_persistent= !mddev->persistent; | |
4799 | ||
4800 | info.utime = mddev->utime; | |
4801 | info.state = 0; | |
4802 | if (mddev->in_sync) | |
4803 | info.state = (1<<MD_SB_CLEAN); | |
c3d9714e | 4804 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 4805 | info.state = (1<<MD_SB_BITMAP_PRESENT); |
a9f326eb | 4806 | info.active_disks = insync; |
1da177e4 LT |
4807 | info.working_disks = working; |
4808 | info.failed_disks = failed; | |
4809 | info.spare_disks = spare; | |
4810 | ||
4811 | info.layout = mddev->layout; | |
9d8f0363 | 4812 | info.chunk_size = mddev->chunk_sectors << 9; |
1da177e4 LT |
4813 | |
4814 | if (copy_to_user(arg, &info, sizeof(info))) | |
4815 | return -EFAULT; | |
4816 | ||
4817 | return 0; | |
4818 | } | |
4819 | ||
87162a28 | 4820 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
4821 | { |
4822 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
4823 | char *ptr, *buf = NULL; | |
4824 | int err = -ENOMEM; | |
4825 | ||
b5470dc5 DW |
4826 | if (md_allow_write(mddev)) |
4827 | file = kmalloc(sizeof(*file), GFP_NOIO); | |
4828 | else | |
4829 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2a2275d6 | 4830 | |
32a7627c N |
4831 | if (!file) |
4832 | goto out; | |
4833 | ||
4834 | /* bitmap disabled, zero the first byte and copy out */ | |
4835 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
4836 | file->pathname[0] = '\0'; | |
4837 | goto copy_out; | |
4838 | } | |
4839 | ||
4840 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
4841 | if (!buf) | |
4842 | goto out; | |
4843 | ||
6bcfd601 CH |
4844 | ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname)); |
4845 | if (IS_ERR(ptr)) | |
32a7627c N |
4846 | goto out; |
4847 | ||
4848 | strcpy(file->pathname, ptr); | |
4849 | ||
4850 | copy_out: | |
4851 | err = 0; | |
4852 | if (copy_to_user(arg, file, sizeof(*file))) | |
4853 | err = -EFAULT; | |
4854 | out: | |
4855 | kfree(buf); | |
4856 | kfree(file); | |
4857 | return err; | |
4858 | } | |
4859 | ||
1da177e4 LT |
4860 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
4861 | { | |
4862 | mdu_disk_info_t info; | |
1da177e4 LT |
4863 | mdk_rdev_t *rdev; |
4864 | ||
4865 | if (copy_from_user(&info, arg, sizeof(info))) | |
4866 | return -EFAULT; | |
4867 | ||
26ef379f | 4868 | rdev = find_rdev_nr(mddev, info.number); |
1da177e4 LT |
4869 | if (rdev) { |
4870 | info.major = MAJOR(rdev->bdev->bd_dev); | |
4871 | info.minor = MINOR(rdev->bdev->bd_dev); | |
4872 | info.raid_disk = rdev->raid_disk; | |
4873 | info.state = 0; | |
b2d444d7 | 4874 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4875 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 4876 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
4877 | info.state |= (1<<MD_DISK_ACTIVE); |
4878 | info.state |= (1<<MD_DISK_SYNC); | |
4879 | } | |
8ddf9efe N |
4880 | if (test_bit(WriteMostly, &rdev->flags)) |
4881 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
4882 | } else { |
4883 | info.major = info.minor = 0; | |
4884 | info.raid_disk = -1; | |
4885 | info.state = (1<<MD_DISK_REMOVED); | |
4886 | } | |
4887 | ||
4888 | if (copy_to_user(arg, &info, sizeof(info))) | |
4889 | return -EFAULT; | |
4890 | ||
4891 | return 0; | |
4892 | } | |
4893 | ||
4894 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
4895 | { | |
4896 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
4897 | mdk_rdev_t *rdev; | |
4898 | dev_t dev = MKDEV(info->major,info->minor); | |
4899 | ||
4900 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
4901 | return -EOVERFLOW; | |
4902 | ||
4903 | if (!mddev->raid_disks) { | |
4904 | int err; | |
4905 | /* expecting a device which has a superblock */ | |
4906 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
4907 | if (IS_ERR(rdev)) { | |
4908 | printk(KERN_WARNING | |
4909 | "md: md_import_device returned %ld\n", | |
4910 | PTR_ERR(rdev)); | |
4911 | return PTR_ERR(rdev); | |
4912 | } | |
4913 | if (!list_empty(&mddev->disks)) { | |
4914 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
4915 | mdk_rdev_t, same_set); | |
a9f326eb | 4916 | err = super_types[mddev->major_version] |
1da177e4 LT |
4917 | .load_super(rdev, rdev0, mddev->minor_version); |
4918 | if (err < 0) { | |
4919 | printk(KERN_WARNING | |
4920 | "md: %s has different UUID to %s\n", | |
4921 | bdevname(rdev->bdev,b), | |
4922 | bdevname(rdev0->bdev,b2)); | |
4923 | export_rdev(rdev); | |
4924 | return -EINVAL; | |
4925 | } | |
4926 | } | |
4927 | err = bind_rdev_to_array(rdev, mddev); | |
4928 | if (err) | |
4929 | export_rdev(rdev); | |
4930 | return err; | |
4931 | } | |
4932 | ||
4933 | /* | |
4934 | * add_new_disk can be used once the array is assembled | |
4935 | * to add "hot spares". They must already have a superblock | |
4936 | * written | |
4937 | */ | |
4938 | if (mddev->pers) { | |
4939 | int err; | |
4940 | if (!mddev->pers->hot_add_disk) { | |
4941 | printk(KERN_WARNING | |
4942 | "%s: personality does not support diskops!\n", | |
4943 | mdname(mddev)); | |
4944 | return -EINVAL; | |
4945 | } | |
7b1e35f6 N |
4946 | if (mddev->persistent) |
4947 | rdev = md_import_device(dev, mddev->major_version, | |
4948 | mddev->minor_version); | |
4949 | else | |
4950 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
4951 | if (IS_ERR(rdev)) { |
4952 | printk(KERN_WARNING | |
4953 | "md: md_import_device returned %ld\n", | |
4954 | PTR_ERR(rdev)); | |
4955 | return PTR_ERR(rdev); | |
4956 | } | |
41158c7e N |
4957 | /* set save_raid_disk if appropriate */ |
4958 | if (!mddev->persistent) { | |
4959 | if (info->state & (1<<MD_DISK_SYNC) && | |
4960 | info->raid_disk < mddev->raid_disks) | |
4961 | rdev->raid_disk = info->raid_disk; | |
4962 | else | |
4963 | rdev->raid_disk = -1; | |
4964 | } else | |
4965 | super_types[mddev->major_version]. | |
4966 | validate_super(mddev, rdev); | |
4967 | rdev->saved_raid_disk = rdev->raid_disk; | |
4968 | ||
b2d444d7 | 4969 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
4970 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
4971 | set_bit(WriteMostly, &rdev->flags); | |
575a80fa N |
4972 | else |
4973 | clear_bit(WriteMostly, &rdev->flags); | |
8ddf9efe | 4974 | |
1da177e4 LT |
4975 | rdev->raid_disk = -1; |
4976 | err = bind_rdev_to_array(rdev, mddev); | |
7c7546cc N |
4977 | if (!err && !mddev->pers->hot_remove_disk) { |
4978 | /* If there is hot_add_disk but no hot_remove_disk | |
4979 | * then added disks for geometry changes, | |
4980 | * and should be added immediately. | |
4981 | */ | |
4982 | super_types[mddev->major_version]. | |
4983 | validate_super(mddev, rdev); | |
4984 | err = mddev->pers->hot_add_disk(mddev, rdev); | |
4985 | if (err) | |
4986 | unbind_rdev_from_array(rdev); | |
4987 | } | |
1da177e4 LT |
4988 | if (err) |
4989 | export_rdev(rdev); | |
52664732 | 4990 | else |
3c0ee63a | 4991 | sysfs_notify_dirent(rdev->sysfs_state); |
c361777f | 4992 | |
17571284 | 4993 | md_update_sb(mddev, 1); |
72a23c21 NB |
4994 | if (mddev->degraded) |
4995 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
c361777f | 4996 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
005eca5e | 4997 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
4998 | return err; |
4999 | } | |
5000 | ||
5001 | /* otherwise, add_new_disk is only allowed | |
5002 | * for major_version==0 superblocks | |
5003 | */ | |
5004 | if (mddev->major_version != 0) { | |
5005 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
5006 | mdname(mddev)); | |
5007 | return -EINVAL; | |
5008 | } | |
5009 | ||
5010 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
5011 | int err; | |
d710e138 | 5012 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5013 | if (IS_ERR(rdev)) { |
5014 | printk(KERN_WARNING | |
5015 | "md: error, md_import_device() returned %ld\n", | |
5016 | PTR_ERR(rdev)); | |
5017 | return PTR_ERR(rdev); | |
5018 | } | |
5019 | rdev->desc_nr = info->number; | |
5020 | if (info->raid_disk < mddev->raid_disks) | |
5021 | rdev->raid_disk = info->raid_disk; | |
5022 | else | |
5023 | rdev->raid_disk = -1; | |
5024 | ||
1da177e4 | 5025 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
5026 | if (info->state & (1<<MD_DISK_SYNC)) |
5027 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 5028 | |
8ddf9efe N |
5029 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
5030 | set_bit(WriteMostly, &rdev->flags); | |
5031 | ||
1da177e4 LT |
5032 | if (!mddev->persistent) { |
5033 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
0f420358 | 5034 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 5035 | } else |
0f420358 | 5036 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
8190e754 | 5037 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5038 | |
2bf071bf N |
5039 | err = bind_rdev_to_array(rdev, mddev); |
5040 | if (err) { | |
5041 | export_rdev(rdev); | |
5042 | return err; | |
5043 | } | |
1da177e4 LT |
5044 | } |
5045 | ||
5046 | return 0; | |
5047 | } | |
5048 | ||
5049 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
5050 | { | |
5051 | char b[BDEVNAME_SIZE]; | |
5052 | mdk_rdev_t *rdev; | |
5053 | ||
1da177e4 LT |
5054 | rdev = find_rdev(mddev, dev); |
5055 | if (!rdev) | |
5056 | return -ENXIO; | |
5057 | ||
5058 | if (rdev->raid_disk >= 0) | |
5059 | goto busy; | |
5060 | ||
5061 | kick_rdev_from_array(rdev); | |
850b2b42 | 5062 | md_update_sb(mddev, 1); |
d7603b7e | 5063 | md_new_event(mddev); |
1da177e4 LT |
5064 | |
5065 | return 0; | |
5066 | busy: | |
fdefa4d8 | 5067 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n", |
1da177e4 LT |
5068 | bdevname(rdev->bdev,b), mdname(mddev)); |
5069 | return -EBUSY; | |
5070 | } | |
5071 | ||
5072 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
5073 | { | |
5074 | char b[BDEVNAME_SIZE]; | |
5075 | int err; | |
1da177e4 LT |
5076 | mdk_rdev_t *rdev; |
5077 | ||
5078 | if (!mddev->pers) | |
5079 | return -ENODEV; | |
5080 | ||
5081 | if (mddev->major_version != 0) { | |
5082 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
5083 | " version-0 superblocks.\n", | |
5084 | mdname(mddev)); | |
5085 | return -EINVAL; | |
5086 | } | |
5087 | if (!mddev->pers->hot_add_disk) { | |
5088 | printk(KERN_WARNING | |
5089 | "%s: personality does not support diskops!\n", | |
5090 | mdname(mddev)); | |
5091 | return -EINVAL; | |
5092 | } | |
5093 | ||
d710e138 | 5094 | rdev = md_import_device(dev, -1, 0); |
1da177e4 LT |
5095 | if (IS_ERR(rdev)) { |
5096 | printk(KERN_WARNING | |
5097 | "md: error, md_import_device() returned %ld\n", | |
5098 | PTR_ERR(rdev)); | |
5099 | return -EINVAL; | |
5100 | } | |
5101 | ||
5102 | if (mddev->persistent) | |
0f420358 | 5103 | rdev->sb_start = calc_dev_sboffset(rdev->bdev); |
1da177e4 | 5104 | else |
0f420358 | 5105 | rdev->sb_start = rdev->bdev->bd_inode->i_size / 512; |
1da177e4 | 5106 | |
8190e754 | 5107 | rdev->sectors = rdev->sb_start; |
1da177e4 | 5108 | |
b2d444d7 | 5109 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
5110 | printk(KERN_WARNING |
5111 | "md: can not hot-add faulty %s disk to %s!\n", | |
5112 | bdevname(rdev->bdev,b), mdname(mddev)); | |
5113 | err = -EINVAL; | |
5114 | goto abort_export; | |
5115 | } | |
b2d444d7 | 5116 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 5117 | rdev->desc_nr = -1; |
5842730d | 5118 | rdev->saved_raid_disk = -1; |
2bf071bf N |
5119 | err = bind_rdev_to_array(rdev, mddev); |
5120 | if (err) | |
5121 | goto abort_export; | |
1da177e4 LT |
5122 | |
5123 | /* | |
5124 | * The rest should better be atomic, we can have disk failures | |
5125 | * noticed in interrupt contexts ... | |
5126 | */ | |
5127 | ||
1da177e4 LT |
5128 | rdev->raid_disk = -1; |
5129 | ||
850b2b42 | 5130 | md_update_sb(mddev, 1); |
1da177e4 LT |
5131 | |
5132 | /* | |
5133 | * Kick recovery, maybe this spare has to be added to the | |
5134 | * array immediately. | |
5135 | */ | |
5136 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5137 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 5138 | md_new_event(mddev); |
1da177e4 LT |
5139 | return 0; |
5140 | ||
1da177e4 LT |
5141 | abort_export: |
5142 | export_rdev(rdev); | |
5143 | return err; | |
5144 | } | |
5145 | ||
32a7627c N |
5146 | static int set_bitmap_file(mddev_t *mddev, int fd) |
5147 | { | |
5148 | int err; | |
5149 | ||
36fa3063 N |
5150 | if (mddev->pers) { |
5151 | if (!mddev->pers->quiesce) | |
5152 | return -EBUSY; | |
5153 | if (mddev->recovery || mddev->sync_thread) | |
5154 | return -EBUSY; | |
5155 | /* we should be able to change the bitmap.. */ | |
5156 | } | |
32a7627c | 5157 | |
32a7627c | 5158 | |
36fa3063 N |
5159 | if (fd >= 0) { |
5160 | if (mddev->bitmap) | |
5161 | return -EEXIST; /* cannot add when bitmap is present */ | |
c3d9714e | 5162 | mddev->bitmap_info.file = fget(fd); |
32a7627c | 5163 | |
c3d9714e | 5164 | if (mddev->bitmap_info.file == NULL) { |
36fa3063 N |
5165 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", |
5166 | mdname(mddev)); | |
5167 | return -EBADF; | |
5168 | } | |
5169 | ||
c3d9714e | 5170 | err = deny_bitmap_write_access(mddev->bitmap_info.file); |
36fa3063 N |
5171 | if (err) { |
5172 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
5173 | mdname(mddev)); | |
c3d9714e N |
5174 | fput(mddev->bitmap_info.file); |
5175 | mddev->bitmap_info.file = NULL; | |
36fa3063 N |
5176 | return err; |
5177 | } | |
c3d9714e | 5178 | mddev->bitmap_info.offset = 0; /* file overrides offset */ |
36fa3063 N |
5179 | } else if (mddev->bitmap == NULL) |
5180 | return -ENOENT; /* cannot remove what isn't there */ | |
5181 | err = 0; | |
5182 | if (mddev->pers) { | |
5183 | mddev->pers->quiesce(mddev, 1); | |
5184 | if (fd >= 0) | |
5185 | err = bitmap_create(mddev); | |
d7375ab3 | 5186 | if (fd < 0 || err) { |
36fa3063 | 5187 | bitmap_destroy(mddev); |
d7375ab3 N |
5188 | fd = -1; /* make sure to put the file */ |
5189 | } | |
36fa3063 | 5190 | mddev->pers->quiesce(mddev, 0); |
d7375ab3 N |
5191 | } |
5192 | if (fd < 0) { | |
c3d9714e N |
5193 | if (mddev->bitmap_info.file) { |
5194 | restore_bitmap_write_access(mddev->bitmap_info.file); | |
5195 | fput(mddev->bitmap_info.file); | |
acc55e22 | 5196 | } |
c3d9714e | 5197 | mddev->bitmap_info.file = NULL; |
36fa3063 N |
5198 | } |
5199 | ||
32a7627c N |
5200 | return err; |
5201 | } | |
5202 | ||
1da177e4 LT |
5203 | /* |
5204 | * set_array_info is used two different ways | |
5205 | * The original usage is when creating a new array. | |
5206 | * In this usage, raid_disks is > 0 and it together with | |
5207 | * level, size, not_persistent,layout,chunksize determine the | |
5208 | * shape of the array. | |
5209 | * This will always create an array with a type-0.90.0 superblock. | |
5210 | * The newer usage is when assembling an array. | |
5211 | * In this case raid_disks will be 0, and the major_version field is | |
5212 | * use to determine which style super-blocks are to be found on the devices. | |
5213 | * The minor and patch _version numbers are also kept incase the | |
5214 | * super_block handler wishes to interpret them. | |
5215 | */ | |
5216 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
5217 | { | |
5218 | ||
5219 | if (info->raid_disks == 0) { | |
5220 | /* just setting version number for superblock loading */ | |
5221 | if (info->major_version < 0 || | |
50511da3 | 5222 | info->major_version >= ARRAY_SIZE(super_types) || |
1da177e4 LT |
5223 | super_types[info->major_version].name == NULL) { |
5224 | /* maybe try to auto-load a module? */ | |
5225 | printk(KERN_INFO | |
5226 | "md: superblock version %d not known\n", | |
5227 | info->major_version); | |
5228 | return -EINVAL; | |
5229 | } | |
5230 | mddev->major_version = info->major_version; | |
5231 | mddev->minor_version = info->minor_version; | |
5232 | mddev->patch_version = info->patch_version; | |
3f9d7b0d | 5233 | mddev->persistent = !info->not_persistent; |
1da177e4 LT |
5234 | return 0; |
5235 | } | |
5236 | mddev->major_version = MD_MAJOR_VERSION; | |
5237 | mddev->minor_version = MD_MINOR_VERSION; | |
5238 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
5239 | mddev->ctime = get_seconds(); | |
5240 | ||
5241 | mddev->level = info->level; | |
17115e03 | 5242 | mddev->clevel[0] = 0; |
58c0fed4 | 5243 | mddev->dev_sectors = 2 * (sector_t)info->size; |
1da177e4 LT |
5244 | mddev->raid_disks = info->raid_disks; |
5245 | /* don't set md_minor, it is determined by which /dev/md* was | |
5246 | * openned | |
5247 | */ | |
5248 | if (info->state & (1<<MD_SB_CLEAN)) | |
5249 | mddev->recovery_cp = MaxSector; | |
5250 | else | |
5251 | mddev->recovery_cp = 0; | |
5252 | mddev->persistent = ! info->not_persistent; | |
e691063a | 5253 | mddev->external = 0; |
1da177e4 LT |
5254 | |
5255 | mddev->layout = info->layout; | |
9d8f0363 | 5256 | mddev->chunk_sectors = info->chunk_size >> 9; |
1da177e4 LT |
5257 | |
5258 | mddev->max_disks = MD_SB_DISKS; | |
5259 | ||
e691063a N |
5260 | if (mddev->persistent) |
5261 | mddev->flags = 0; | |
850b2b42 | 5262 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 5263 | |
c3d9714e N |
5264 | mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9; |
5265 | mddev->bitmap_info.offset = 0; | |
b2a2703c | 5266 | |
f6705578 N |
5267 | mddev->reshape_position = MaxSector; |
5268 | ||
1da177e4 LT |
5269 | /* |
5270 | * Generate a 128 bit UUID | |
5271 | */ | |
5272 | get_random_bytes(mddev->uuid, 16); | |
5273 | ||
f6705578 | 5274 | mddev->new_level = mddev->level; |
664e7c41 | 5275 | mddev->new_chunk_sectors = mddev->chunk_sectors; |
f6705578 N |
5276 | mddev->new_layout = mddev->layout; |
5277 | mddev->delta_disks = 0; | |
5278 | ||
1da177e4 LT |
5279 | return 0; |
5280 | } | |
5281 | ||
1f403624 DW |
5282 | void md_set_array_sectors(mddev_t *mddev, sector_t array_sectors) |
5283 | { | |
b522adcd DW |
5284 | WARN(!mddev_is_locked(mddev), "%s: unlocked mddev!\n", __func__); |
5285 | ||
5286 | if (mddev->external_size) | |
5287 | return; | |
5288 | ||
1f403624 DW |
5289 | mddev->array_sectors = array_sectors; |
5290 | } | |
5291 | EXPORT_SYMBOL(md_set_array_sectors); | |
5292 | ||
d71f9f88 | 5293 | static int update_size(mddev_t *mddev, sector_t num_sectors) |
a35b0d69 | 5294 | { |
159ec1fc | 5295 | mdk_rdev_t *rdev; |
a35b0d69 | 5296 | int rv; |
d71f9f88 | 5297 | int fit = (num_sectors == 0); |
a35b0d69 N |
5298 | |
5299 | if (mddev->pers->resize == NULL) | |
5300 | return -EINVAL; | |
d71f9f88 AN |
5301 | /* The "num_sectors" is the number of sectors of each device that |
5302 | * is used. This can only make sense for arrays with redundancy. | |
5303 | * linear and raid0 always use whatever space is available. We can only | |
5304 | * consider changing this number if no resync or reconstruction is | |
5305 | * happening, and if the new size is acceptable. It must fit before the | |
0f420358 | 5306 | * sb_start or, if that is <data_offset, it must fit before the size |
d71f9f88 AN |
5307 | * of each device. If num_sectors is zero, we find the largest size |
5308 | * that fits. | |
5309 | ||
a35b0d69 N |
5310 | */ |
5311 | if (mddev->sync_thread) | |
5312 | return -EBUSY; | |
dba034ee N |
5313 | if (mddev->bitmap) |
5314 | /* Sorry, cannot grow a bitmap yet, just remove it, | |
5315 | * grow, and re-add. | |
5316 | */ | |
5317 | return -EBUSY; | |
159ec1fc | 5318 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dd8ac336 | 5319 | sector_t avail = rdev->sectors; |
01ab5662 | 5320 | |
d71f9f88 AN |
5321 | if (fit && (num_sectors == 0 || num_sectors > avail)) |
5322 | num_sectors = avail; | |
5323 | if (avail < num_sectors) | |
a35b0d69 N |
5324 | return -ENOSPC; |
5325 | } | |
d71f9f88 | 5326 | rv = mddev->pers->resize(mddev, num_sectors); |
449aad3e N |
5327 | if (!rv) |
5328 | revalidate_disk(mddev->gendisk); | |
a35b0d69 N |
5329 | return rv; |
5330 | } | |
5331 | ||
da943b99 N |
5332 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
5333 | { | |
5334 | int rv; | |
5335 | /* change the number of raid disks */ | |
63c70c4f | 5336 | if (mddev->pers->check_reshape == NULL) |
da943b99 N |
5337 | return -EINVAL; |
5338 | if (raid_disks <= 0 || | |
5339 | raid_disks >= mddev->max_disks) | |
5340 | return -EINVAL; | |
63c70c4f | 5341 | if (mddev->sync_thread || mddev->reshape_position != MaxSector) |
da943b99 | 5342 | return -EBUSY; |
63c70c4f N |
5343 | mddev->delta_disks = raid_disks - mddev->raid_disks; |
5344 | ||
5345 | rv = mddev->pers->check_reshape(mddev); | |
da943b99 N |
5346 | return rv; |
5347 | } | |
5348 | ||
5349 | ||
1da177e4 LT |
5350 | /* |
5351 | * update_array_info is used to change the configuration of an | |
5352 | * on-line array. | |
5353 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
5354 | * fields in the info are checked against the array. | |
5355 | * Any differences that cannot be handled will cause an error. | |
5356 | * Normally, only one change can be managed at a time. | |
5357 | */ | |
5358 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
5359 | { | |
5360 | int rv = 0; | |
5361 | int cnt = 0; | |
36fa3063 N |
5362 | int state = 0; |
5363 | ||
5364 | /* calculate expected state,ignoring low bits */ | |
c3d9714e | 5365 | if (mddev->bitmap && mddev->bitmap_info.offset) |
36fa3063 | 5366 | state |= (1 << MD_SB_BITMAP_PRESENT); |
1da177e4 LT |
5367 | |
5368 | if (mddev->major_version != info->major_version || | |
5369 | mddev->minor_version != info->minor_version || | |
5370 | /* mddev->patch_version != info->patch_version || */ | |
5371 | mddev->ctime != info->ctime || | |
5372 | mddev->level != info->level || | |
5373 | /* mddev->layout != info->layout || */ | |
5374 | !mddev->persistent != info->not_persistent|| | |
9d8f0363 | 5375 | mddev->chunk_sectors != info->chunk_size >> 9 || |
36fa3063 N |
5376 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ |
5377 | ((state^info->state) & 0xfffffe00) | |
5378 | ) | |
1da177e4 LT |
5379 | return -EINVAL; |
5380 | /* Check there is only one change */ | |
58c0fed4 AN |
5381 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
5382 | cnt++; | |
5383 | if (mddev->raid_disks != info->raid_disks) | |
5384 | cnt++; | |
5385 | if (mddev->layout != info->layout) | |
5386 | cnt++; | |
5387 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) | |
5388 | cnt++; | |
5389 | if (cnt == 0) | |
5390 | return 0; | |
5391 | if (cnt > 1) | |
5392 | return -EINVAL; | |
1da177e4 LT |
5393 | |
5394 | if (mddev->layout != info->layout) { | |
5395 | /* Change layout | |
5396 | * we don't need to do anything at the md level, the | |
5397 | * personality will take care of it all. | |
5398 | */ | |
50ac168a | 5399 | if (mddev->pers->check_reshape == NULL) |
1da177e4 | 5400 | return -EINVAL; |
597a711b N |
5401 | else { |
5402 | mddev->new_layout = info->layout; | |
50ac168a | 5403 | rv = mddev->pers->check_reshape(mddev); |
597a711b N |
5404 | if (rv) |
5405 | mddev->new_layout = mddev->layout; | |
5406 | return rv; | |
5407 | } | |
1da177e4 | 5408 | } |
58c0fed4 | 5409 | if (info->size >= 0 && mddev->dev_sectors / 2 != info->size) |
d71f9f88 | 5410 | rv = update_size(mddev, (sector_t)info->size * 2); |
a35b0d69 | 5411 | |
da943b99 N |
5412 | if (mddev->raid_disks != info->raid_disks) |
5413 | rv = update_raid_disks(mddev, info->raid_disks); | |
5414 | ||
36fa3063 N |
5415 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
5416 | if (mddev->pers->quiesce == NULL) | |
5417 | return -EINVAL; | |
5418 | if (mddev->recovery || mddev->sync_thread) | |
5419 | return -EBUSY; | |
5420 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
5421 | /* add the bitmap */ | |
5422 | if (mddev->bitmap) | |
5423 | return -EEXIST; | |
c3d9714e | 5424 | if (mddev->bitmap_info.default_offset == 0) |
36fa3063 | 5425 | return -EINVAL; |
c3d9714e N |
5426 | mddev->bitmap_info.offset = |
5427 | mddev->bitmap_info.default_offset; | |
36fa3063 N |
5428 | mddev->pers->quiesce(mddev, 1); |
5429 | rv = bitmap_create(mddev); | |
5430 | if (rv) | |
5431 | bitmap_destroy(mddev); | |
5432 | mddev->pers->quiesce(mddev, 0); | |
5433 | } else { | |
5434 | /* remove the bitmap */ | |
5435 | if (!mddev->bitmap) | |
5436 | return -ENOENT; | |
5437 | if (mddev->bitmap->file) | |
5438 | return -EINVAL; | |
5439 | mddev->pers->quiesce(mddev, 1); | |
5440 | bitmap_destroy(mddev); | |
5441 | mddev->pers->quiesce(mddev, 0); | |
c3d9714e | 5442 | mddev->bitmap_info.offset = 0; |
36fa3063 N |
5443 | } |
5444 | } | |
850b2b42 | 5445 | md_update_sb(mddev, 1); |
1da177e4 LT |
5446 | return rv; |
5447 | } | |
5448 | ||
5449 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
5450 | { | |
5451 | mdk_rdev_t *rdev; | |
5452 | ||
5453 | if (mddev->pers == NULL) | |
5454 | return -ENODEV; | |
5455 | ||
5456 | rdev = find_rdev(mddev, dev); | |
5457 | if (!rdev) | |
5458 | return -ENODEV; | |
5459 | ||
5460 | md_error(mddev, rdev); | |
5461 | return 0; | |
5462 | } | |
5463 | ||
2f9618ce AN |
5464 | /* |
5465 | * We have a problem here : there is no easy way to give a CHS | |
5466 | * virtual geometry. We currently pretend that we have a 2 heads | |
5467 | * 4 sectors (with a BIG number of cylinders...). This drives | |
5468 | * dosfs just mad... ;-) | |
5469 | */ | |
a885c8c4 CH |
5470 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
5471 | { | |
5472 | mddev_t *mddev = bdev->bd_disk->private_data; | |
5473 | ||
5474 | geo->heads = 2; | |
5475 | geo->sectors = 4; | |
5476 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
5477 | return 0; | |
5478 | } | |
5479 | ||
a39907fa | 5480 | static int md_ioctl(struct block_device *bdev, fmode_t mode, |
1da177e4 LT |
5481 | unsigned int cmd, unsigned long arg) |
5482 | { | |
5483 | int err = 0; | |
5484 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
5485 | mddev_t *mddev = NULL; |
5486 | ||
5487 | if (!capable(CAP_SYS_ADMIN)) | |
5488 | return -EACCES; | |
5489 | ||
5490 | /* | |
5491 | * Commands dealing with the RAID driver but not any | |
5492 | * particular array: | |
5493 | */ | |
5494 | switch (cmd) | |
5495 | { | |
5496 | case RAID_VERSION: | |
5497 | err = get_version(argp); | |
5498 | goto done; | |
5499 | ||
5500 | case PRINT_RAID_DEBUG: | |
5501 | err = 0; | |
5502 | md_print_devices(); | |
5503 | goto done; | |
5504 | ||
5505 | #ifndef MODULE | |
5506 | case RAID_AUTORUN: | |
5507 | err = 0; | |
5508 | autostart_arrays(arg); | |
5509 | goto done; | |
5510 | #endif | |
5511 | default:; | |
5512 | } | |
5513 | ||
5514 | /* | |
5515 | * Commands creating/starting a new array: | |
5516 | */ | |
5517 | ||
a39907fa | 5518 | mddev = bdev->bd_disk->private_data; |
1da177e4 LT |
5519 | |
5520 | if (!mddev) { | |
5521 | BUG(); | |
5522 | goto abort; | |
5523 | } | |
5524 | ||
1da177e4 LT |
5525 | err = mddev_lock(mddev); |
5526 | if (err) { | |
5527 | printk(KERN_INFO | |
5528 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
5529 | err, cmd); | |
5530 | goto abort; | |
5531 | } | |
5532 | ||
5533 | switch (cmd) | |
5534 | { | |
5535 | case SET_ARRAY_INFO: | |
5536 | { | |
5537 | mdu_array_info_t info; | |
5538 | if (!arg) | |
5539 | memset(&info, 0, sizeof(info)); | |
5540 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
5541 | err = -EFAULT; | |
5542 | goto abort_unlock; | |
5543 | } | |
5544 | if (mddev->pers) { | |
5545 | err = update_array_info(mddev, &info); | |
5546 | if (err) { | |
5547 | printk(KERN_WARNING "md: couldn't update" | |
5548 | " array info. %d\n", err); | |
5549 | goto abort_unlock; | |
5550 | } | |
5551 | goto done_unlock; | |
5552 | } | |
5553 | if (!list_empty(&mddev->disks)) { | |
5554 | printk(KERN_WARNING | |
5555 | "md: array %s already has disks!\n", | |
5556 | mdname(mddev)); | |
5557 | err = -EBUSY; | |
5558 | goto abort_unlock; | |
5559 | } | |
5560 | if (mddev->raid_disks) { | |
5561 | printk(KERN_WARNING | |
5562 | "md: array %s already initialised!\n", | |
5563 | mdname(mddev)); | |
5564 | err = -EBUSY; | |
5565 | goto abort_unlock; | |
5566 | } | |
5567 | err = set_array_info(mddev, &info); | |
5568 | if (err) { | |
5569 | printk(KERN_WARNING "md: couldn't set" | |
5570 | " array info. %d\n", err); | |
5571 | goto abort_unlock; | |
5572 | } | |
5573 | } | |
5574 | goto done_unlock; | |
5575 | ||
5576 | default:; | |
5577 | } | |
5578 | ||
5579 | /* | |
5580 | * Commands querying/configuring an existing array: | |
5581 | */ | |
32a7627c | 5582 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3f9d7b0d | 5583 | * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */ |
a17184a9 N |
5584 | if ((!mddev->raid_disks && !mddev->external) |
5585 | && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
5586 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE | |
5587 | && cmd != GET_BITMAP_FILE) { | |
1da177e4 LT |
5588 | err = -ENODEV; |
5589 | goto abort_unlock; | |
5590 | } | |
5591 | ||
5592 | /* | |
5593 | * Commands even a read-only array can execute: | |
5594 | */ | |
5595 | switch (cmd) | |
5596 | { | |
5597 | case GET_ARRAY_INFO: | |
5598 | err = get_array_info(mddev, argp); | |
5599 | goto done_unlock; | |
5600 | ||
32a7627c | 5601 | case GET_BITMAP_FILE: |
87162a28 | 5602 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
5603 | goto done_unlock; |
5604 | ||
1da177e4 LT |
5605 | case GET_DISK_INFO: |
5606 | err = get_disk_info(mddev, argp); | |
5607 | goto done_unlock; | |
5608 | ||
5609 | case RESTART_ARRAY_RW: | |
5610 | err = restart_array(mddev); | |
5611 | goto done_unlock; | |
5612 | ||
5613 | case STOP_ARRAY: | |
d710e138 | 5614 | err = do_md_stop(mddev, 0, 1); |
1da177e4 LT |
5615 | goto done_unlock; |
5616 | ||
5617 | case STOP_ARRAY_RO: | |
d710e138 | 5618 | err = do_md_stop(mddev, 1, 1); |
1da177e4 LT |
5619 | goto done_unlock; |
5620 | ||
1da177e4 LT |
5621 | } |
5622 | ||
5623 | /* | |
5624 | * The remaining ioctls are changing the state of the | |
f91de92e N |
5625 | * superblock, so we do not allow them on read-only arrays. |
5626 | * However non-MD ioctls (e.g. get-size) will still come through | |
5627 | * here and hit the 'default' below, so only disallow | |
5628 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 5629 | */ |
bb57fc64 | 5630 | if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) { |
f91de92e N |
5631 | if (mddev->ro == 2) { |
5632 | mddev->ro = 0; | |
b62b7590 | 5633 | sysfs_notify_dirent(mddev->sysfs_state); |
0fd62b86 NB |
5634 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
5635 | md_wakeup_thread(mddev->thread); | |
f91de92e N |
5636 | } else { |
5637 | err = -EROFS; | |
5638 | goto abort_unlock; | |
5639 | } | |
1da177e4 LT |
5640 | } |
5641 | ||
5642 | switch (cmd) | |
5643 | { | |
5644 | case ADD_NEW_DISK: | |
5645 | { | |
5646 | mdu_disk_info_t info; | |
5647 | if (copy_from_user(&info, argp, sizeof(info))) | |
5648 | err = -EFAULT; | |
5649 | else | |
5650 | err = add_new_disk(mddev, &info); | |
5651 | goto done_unlock; | |
5652 | } | |
5653 | ||
5654 | case HOT_REMOVE_DISK: | |
5655 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
5656 | goto done_unlock; | |
5657 | ||
5658 | case HOT_ADD_DISK: | |
5659 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
5660 | goto done_unlock; | |
5661 | ||
5662 | case SET_DISK_FAULTY: | |
5663 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
5664 | goto done_unlock; | |
5665 | ||
5666 | case RUN_ARRAY: | |
d710e138 | 5667 | err = do_md_run(mddev); |
1da177e4 LT |
5668 | goto done_unlock; |
5669 | ||
32a7627c N |
5670 | case SET_BITMAP_FILE: |
5671 | err = set_bitmap_file(mddev, (int)arg); | |
5672 | goto done_unlock; | |
5673 | ||
1da177e4 | 5674 | default: |
1da177e4 LT |
5675 | err = -EINVAL; |
5676 | goto abort_unlock; | |
5677 | } | |
5678 | ||
5679 | done_unlock: | |
5680 | abort_unlock: | |
d3374825 N |
5681 | if (mddev->hold_active == UNTIL_IOCTL && |
5682 | err != -EINVAL) | |
5683 | mddev->hold_active = 0; | |
1da177e4 LT |
5684 | mddev_unlock(mddev); |
5685 | ||
5686 | return err; | |
5687 | done: | |
5688 | if (err) | |
5689 | MD_BUG(); | |
5690 | abort: | |
5691 | return err; | |
5692 | } | |
aa98aa31 AB |
5693 | #ifdef CONFIG_COMPAT |
5694 | static int md_compat_ioctl(struct block_device *bdev, fmode_t mode, | |
5695 | unsigned int cmd, unsigned long arg) | |
5696 | { | |
5697 | switch (cmd) { | |
5698 | case HOT_REMOVE_DISK: | |
5699 | case HOT_ADD_DISK: | |
5700 | case SET_DISK_FAULTY: | |
5701 | case SET_BITMAP_FILE: | |
5702 | /* These take in integer arg, do not convert */ | |
5703 | break; | |
5704 | default: | |
5705 | arg = (unsigned long)compat_ptr(arg); | |
5706 | break; | |
5707 | } | |
5708 | ||
5709 | return md_ioctl(bdev, mode, cmd, arg); | |
5710 | } | |
5711 | #endif /* CONFIG_COMPAT */ | |
1da177e4 | 5712 | |
a39907fa | 5713 | static int md_open(struct block_device *bdev, fmode_t mode) |
1da177e4 LT |
5714 | { |
5715 | /* | |
5716 | * Succeed if we can lock the mddev, which confirms that | |
5717 | * it isn't being stopped right now. | |
5718 | */ | |
d3374825 | 5719 | mddev_t *mddev = mddev_find(bdev->bd_dev); |
1da177e4 LT |
5720 | int err; |
5721 | ||
d3374825 N |
5722 | if (mddev->gendisk != bdev->bd_disk) { |
5723 | /* we are racing with mddev_put which is discarding this | |
5724 | * bd_disk. | |
5725 | */ | |
5726 | mddev_put(mddev); | |
5727 | /* Wait until bdev->bd_disk is definitely gone */ | |
5728 | flush_scheduled_work(); | |
5729 | /* Then retry the open from the top */ | |
5730 | return -ERESTARTSYS; | |
5731 | } | |
5732 | BUG_ON(mddev != bdev->bd_disk->private_data); | |
5733 | ||
c8c00a69 | 5734 | if ((err = mutex_lock_interruptible(&mddev->open_mutex))) |
1da177e4 LT |
5735 | goto out; |
5736 | ||
5737 | err = 0; | |
f2ea68cf | 5738 | atomic_inc(&mddev->openers); |
c8c00a69 | 5739 | mutex_unlock(&mddev->open_mutex); |
1da177e4 | 5740 | |
a39907fa | 5741 | check_disk_change(bdev); |
1da177e4 LT |
5742 | out: |
5743 | return err; | |
5744 | } | |
5745 | ||
a39907fa | 5746 | static int md_release(struct gendisk *disk, fmode_t mode) |
1da177e4 | 5747 | { |
a39907fa | 5748 | mddev_t *mddev = disk->private_data; |
1da177e4 | 5749 | |
52e5f9d1 | 5750 | BUG_ON(!mddev); |
f2ea68cf | 5751 | atomic_dec(&mddev->openers); |
1da177e4 LT |
5752 | mddev_put(mddev); |
5753 | ||
5754 | return 0; | |
5755 | } | |
5756 | ||
44ce6294 LT |
5757 | static int md_media_changed(struct gendisk *disk) |
5758 | { | |
5759 | mddev_t *mddev = disk->private_data; | |
5760 | ||
5761 | return mddev->changed; | |
5762 | } | |
5763 | ||
5764 | static int md_revalidate(struct gendisk *disk) | |
5765 | { | |
5766 | mddev_t *mddev = disk->private_data; | |
5767 | ||
5768 | mddev->changed = 0; | |
5769 | return 0; | |
5770 | } | |
83d5cde4 | 5771 | static const struct block_device_operations md_fops = |
1da177e4 LT |
5772 | { |
5773 | .owner = THIS_MODULE, | |
a39907fa AV |
5774 | .open = md_open, |
5775 | .release = md_release, | |
b492b852 | 5776 | .ioctl = md_ioctl, |
aa98aa31 AB |
5777 | #ifdef CONFIG_COMPAT |
5778 | .compat_ioctl = md_compat_ioctl, | |
5779 | #endif | |
a885c8c4 | 5780 | .getgeo = md_getgeo, |
44ce6294 LT |
5781 | .media_changed = md_media_changed, |
5782 | .revalidate_disk= md_revalidate, | |
1da177e4 LT |
5783 | }; |
5784 | ||
75c96f85 | 5785 | static int md_thread(void * arg) |
1da177e4 LT |
5786 | { |
5787 | mdk_thread_t *thread = arg; | |
5788 | ||
1da177e4 LT |
5789 | /* |
5790 | * md_thread is a 'system-thread', it's priority should be very | |
5791 | * high. We avoid resource deadlocks individually in each | |
5792 | * raid personality. (RAID5 does preallocation) We also use RR and | |
5793 | * the very same RT priority as kswapd, thus we will never get | |
5794 | * into a priority inversion deadlock. | |
5795 | * | |
5796 | * we definitely have to have equal or higher priority than | |
5797 | * bdflush, otherwise bdflush will deadlock if there are too | |
5798 | * many dirty RAID5 blocks. | |
5799 | */ | |
1da177e4 | 5800 | |
6985c43f | 5801 | allow_signal(SIGKILL); |
a6fb0934 | 5802 | while (!kthread_should_stop()) { |
1da177e4 | 5803 | |
93588e22 N |
5804 | /* We need to wait INTERRUPTIBLE so that |
5805 | * we don't add to the load-average. | |
5806 | * That means we need to be sure no signals are | |
5807 | * pending | |
5808 | */ | |
5809 | if (signal_pending(current)) | |
5810 | flush_signals(current); | |
5811 | ||
5812 | wait_event_interruptible_timeout | |
5813 | (thread->wqueue, | |
5814 | test_bit(THREAD_WAKEUP, &thread->flags) | |
5815 | || kthread_should_stop(), | |
5816 | thread->timeout); | |
1da177e4 LT |
5817 | |
5818 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
5819 | ||
787453c2 | 5820 | thread->run(thread->mddev); |
1da177e4 | 5821 | } |
a6fb0934 | 5822 | |
1da177e4 LT |
5823 | return 0; |
5824 | } | |
5825 | ||
5826 | void md_wakeup_thread(mdk_thread_t *thread) | |
5827 | { | |
5828 | if (thread) { | |
5829 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
5830 | set_bit(THREAD_WAKEUP, &thread->flags); | |
5831 | wake_up(&thread->wqueue); | |
5832 | } | |
5833 | } | |
5834 | ||
5835 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
5836 | const char *name) | |
5837 | { | |
5838 | mdk_thread_t *thread; | |
1da177e4 | 5839 | |
9ffae0cf | 5840 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
5841 | if (!thread) |
5842 | return NULL; | |
5843 | ||
1da177e4 LT |
5844 | init_waitqueue_head(&thread->wqueue); |
5845 | ||
1da177e4 LT |
5846 | thread->run = run; |
5847 | thread->mddev = mddev; | |
32a7627c | 5848 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
0da3c619 N |
5849 | thread->tsk = kthread_run(md_thread, thread, |
5850 | "%s_%s", | |
5851 | mdname(thread->mddev), | |
5852 | name ?: mddev->pers->name); | |
a6fb0934 | 5853 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
5854 | kfree(thread); |
5855 | return NULL; | |
5856 | } | |
1da177e4 LT |
5857 | return thread; |
5858 | } | |
5859 | ||
1da177e4 LT |
5860 | void md_unregister_thread(mdk_thread_t *thread) |
5861 | { | |
e0cf8f04 N |
5862 | if (!thread) |
5863 | return; | |
ba25f9dc | 5864 | dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk)); |
a6fb0934 N |
5865 | |
5866 | kthread_stop(thread->tsk); | |
1da177e4 LT |
5867 | kfree(thread); |
5868 | } | |
5869 | ||
5870 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
5871 | { | |
5872 | if (!mddev) { | |
5873 | MD_BUG(); | |
5874 | return; | |
5875 | } | |
5876 | ||
b2d444d7 | 5877 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 5878 | return; |
6bfe0b49 DW |
5879 | |
5880 | if (mddev->external) | |
5881 | set_bit(Blocked, &rdev->flags); | |
32a7627c | 5882 | /* |
1da177e4 LT |
5883 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
5884 | mdname(mddev), | |
5885 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
5886 | __builtin_return_address(0),__builtin_return_address(1), | |
5887 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 5888 | */ |
d0a0a5ee AM |
5889 | if (!mddev->pers) |
5890 | return; | |
1da177e4 LT |
5891 | if (!mddev->pers->error_handler) |
5892 | return; | |
5893 | mddev->pers->error_handler(mddev,rdev); | |
72a23c21 NB |
5894 | if (mddev->degraded) |
5895 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); | |
52664732 | 5896 | set_bit(StateChanged, &rdev->flags); |
1da177e4 LT |
5897 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
5898 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
5899 | md_wakeup_thread(mddev->thread); | |
c331eb04 | 5900 | md_new_event_inintr(mddev); |
1da177e4 LT |
5901 | } |
5902 | ||
5903 | /* seq_file implementation /proc/mdstat */ | |
5904 | ||
5905 | static void status_unused(struct seq_file *seq) | |
5906 | { | |
5907 | int i = 0; | |
5908 | mdk_rdev_t *rdev; | |
1da177e4 LT |
5909 | |
5910 | seq_printf(seq, "unused devices: "); | |
5911 | ||
159ec1fc | 5912 | list_for_each_entry(rdev, &pending_raid_disks, same_set) { |
1da177e4 LT |
5913 | char b[BDEVNAME_SIZE]; |
5914 | i++; | |
5915 | seq_printf(seq, "%s ", | |
5916 | bdevname(rdev->bdev,b)); | |
5917 | } | |
5918 | if (!i) | |
5919 | seq_printf(seq, "<none>"); | |
5920 | ||
5921 | seq_printf(seq, "\n"); | |
5922 | } | |
5923 | ||
5924 | ||
5925 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
5926 | { | |
dd71cf6b N |
5927 | sector_t max_sectors, resync, res; |
5928 | unsigned long dt, db; | |
5929 | sector_t rt; | |
4588b42e N |
5930 | int scale; |
5931 | unsigned int per_milli; | |
1da177e4 | 5932 | |
dd71cf6b | 5933 | resync = mddev->curr_resync - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
5934 | |
5935 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
dd71cf6b | 5936 | max_sectors = mddev->resync_max_sectors; |
1da177e4 | 5937 | else |
dd71cf6b | 5938 | max_sectors = mddev->dev_sectors; |
1da177e4 LT |
5939 | |
5940 | /* | |
5941 | * Should not happen. | |
5942 | */ | |
dd71cf6b | 5943 | if (!max_sectors) { |
1da177e4 LT |
5944 | MD_BUG(); |
5945 | return; | |
5946 | } | |
4588b42e | 5947 | /* Pick 'scale' such that (resync>>scale)*1000 will fit |
dd71cf6b | 5948 | * in a sector_t, and (max_sectors>>scale) will fit in a |
4588b42e N |
5949 | * u32, as those are the requirements for sector_div. |
5950 | * Thus 'scale' must be at least 10 | |
5951 | */ | |
5952 | scale = 10; | |
5953 | if (sizeof(sector_t) > sizeof(unsigned long)) { | |
dd71cf6b | 5954 | while ( max_sectors/2 > (1ULL<<(scale+32))) |
4588b42e N |
5955 | scale++; |
5956 | } | |
5957 | res = (resync>>scale)*1000; | |
dd71cf6b | 5958 | sector_div(res, (u32)((max_sectors>>scale)+1)); |
4588b42e N |
5959 | |
5960 | per_milli = res; | |
1da177e4 | 5961 | { |
4588b42e | 5962 | int i, x = per_milli/50, y = 20-x; |
1da177e4 LT |
5963 | seq_printf(seq, "["); |
5964 | for (i = 0; i < x; i++) | |
5965 | seq_printf(seq, "="); | |
5966 | seq_printf(seq, ">"); | |
5967 | for (i = 0; i < y; i++) | |
5968 | seq_printf(seq, "."); | |
5969 | seq_printf(seq, "] "); | |
5970 | } | |
4588b42e | 5971 | seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)", |
ccfcc3c1 N |
5972 | (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)? |
5973 | "reshape" : | |
61df9d91 N |
5974 | (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)? |
5975 | "check" : | |
5976 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
5977 | "resync" : "recovery"))), | |
5978 | per_milli/10, per_milli % 10, | |
dd71cf6b N |
5979 | (unsigned long long) resync/2, |
5980 | (unsigned long long) max_sectors/2); | |
1da177e4 LT |
5981 | |
5982 | /* | |
1da177e4 LT |
5983 | * dt: time from mark until now |
5984 | * db: blocks written from mark until now | |
5985 | * rt: remaining time | |
dd71cf6b N |
5986 | * |
5987 | * rt is a sector_t, so could be 32bit or 64bit. | |
5988 | * So we divide before multiply in case it is 32bit and close | |
5989 | * to the limit. | |
5990 | * We scale the divisor (db) by 32 to avoid loosing precision | |
5991 | * near the end of resync when the number of remaining sectors | |
5992 | * is close to 'db'. | |
5993 | * We then divide rt by 32 after multiplying by db to compensate. | |
5994 | * The '+1' avoids division by zero if db is very small. | |
1da177e4 LT |
5995 | */ |
5996 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
5997 | if (!dt) dt++; | |
ff4e8d9a N |
5998 | db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active)) |
5999 | - mddev->resync_mark_cnt; | |
1da177e4 | 6000 | |
dd71cf6b N |
6001 | rt = max_sectors - resync; /* number of remaining sectors */ |
6002 | sector_div(rt, db/32+1); | |
6003 | rt *= dt; | |
6004 | rt >>= 5; | |
6005 | ||
6006 | seq_printf(seq, " finish=%lu.%lumin", (unsigned long)rt / 60, | |
6007 | ((unsigned long)rt % 60)/6); | |
1da177e4 | 6008 | |
ff4e8d9a | 6009 | seq_printf(seq, " speed=%ldK/sec", db/2/dt); |
1da177e4 LT |
6010 | } |
6011 | ||
6012 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
6013 | { | |
6014 | struct list_head *tmp; | |
6015 | loff_t l = *pos; | |
6016 | mddev_t *mddev; | |
6017 | ||
6018 | if (l >= 0x10000) | |
6019 | return NULL; | |
6020 | if (!l--) | |
6021 | /* header */ | |
6022 | return (void*)1; | |
6023 | ||
6024 | spin_lock(&all_mddevs_lock); | |
6025 | list_for_each(tmp,&all_mddevs) | |
6026 | if (!l--) { | |
6027 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
6028 | mddev_get(mddev); | |
6029 | spin_unlock(&all_mddevs_lock); | |
6030 | return mddev; | |
6031 | } | |
6032 | spin_unlock(&all_mddevs_lock); | |
6033 | if (!l--) | |
6034 | return (void*)2;/* tail */ | |
6035 | return NULL; | |
6036 | } | |
6037 | ||
6038 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
6039 | { | |
6040 | struct list_head *tmp; | |
6041 | mddev_t *next_mddev, *mddev = v; | |
6042 | ||
6043 | ++*pos; | |
6044 | if (v == (void*)2) | |
6045 | return NULL; | |
6046 | ||
6047 | spin_lock(&all_mddevs_lock); | |
6048 | if (v == (void*)1) | |
6049 | tmp = all_mddevs.next; | |
6050 | else | |
6051 | tmp = mddev->all_mddevs.next; | |
6052 | if (tmp != &all_mddevs) | |
6053 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
6054 | else { | |
6055 | next_mddev = (void*)2; | |
6056 | *pos = 0x10000; | |
6057 | } | |
6058 | spin_unlock(&all_mddevs_lock); | |
6059 | ||
6060 | if (v != (void*)1) | |
6061 | mddev_put(mddev); | |
6062 | return next_mddev; | |
6063 | ||
6064 | } | |
6065 | ||
6066 | static void md_seq_stop(struct seq_file *seq, void *v) | |
6067 | { | |
6068 | mddev_t *mddev = v; | |
6069 | ||
6070 | if (mddev && v != (void*)1 && v != (void*)2) | |
6071 | mddev_put(mddev); | |
6072 | } | |
6073 | ||
d7603b7e N |
6074 | struct mdstat_info { |
6075 | int event; | |
6076 | }; | |
6077 | ||
1da177e4 LT |
6078 | static int md_seq_show(struct seq_file *seq, void *v) |
6079 | { | |
6080 | mddev_t *mddev = v; | |
dd8ac336 | 6081 | sector_t sectors; |
1da177e4 | 6082 | mdk_rdev_t *rdev; |
d7603b7e | 6083 | struct mdstat_info *mi = seq->private; |
32a7627c | 6084 | struct bitmap *bitmap; |
1da177e4 LT |
6085 | |
6086 | if (v == (void*)1) { | |
2604b703 | 6087 | struct mdk_personality *pers; |
1da177e4 LT |
6088 | seq_printf(seq, "Personalities : "); |
6089 | spin_lock(&pers_lock); | |
2604b703 N |
6090 | list_for_each_entry(pers, &pers_list, list) |
6091 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
6092 | |
6093 | spin_unlock(&pers_lock); | |
6094 | seq_printf(seq, "\n"); | |
d7603b7e | 6095 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
6096 | return 0; |
6097 | } | |
6098 | if (v == (void*)2) { | |
6099 | status_unused(seq); | |
6100 | return 0; | |
6101 | } | |
6102 | ||
5dc5cf7d | 6103 | if (mddev_lock(mddev) < 0) |
1da177e4 | 6104 | return -EINTR; |
5dc5cf7d | 6105 | |
1da177e4 LT |
6106 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { |
6107 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
6108 | mddev->pers ? "" : "in"); | |
6109 | if (mddev->pers) { | |
f91de92e | 6110 | if (mddev->ro==1) |
1da177e4 | 6111 | seq_printf(seq, " (read-only)"); |
f91de92e | 6112 | if (mddev->ro==2) |
52720ae7 | 6113 | seq_printf(seq, " (auto-read-only)"); |
1da177e4 LT |
6114 | seq_printf(seq, " %s", mddev->pers->name); |
6115 | } | |
6116 | ||
dd8ac336 | 6117 | sectors = 0; |
159ec1fc | 6118 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
1da177e4 LT |
6119 | char b[BDEVNAME_SIZE]; |
6120 | seq_printf(seq, " %s[%d]", | |
6121 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
6122 | if (test_bit(WriteMostly, &rdev->flags)) |
6123 | seq_printf(seq, "(W)"); | |
b2d444d7 | 6124 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
6125 | seq_printf(seq, "(F)"); |
6126 | continue; | |
b325a32e N |
6127 | } else if (rdev->raid_disk < 0) |
6128 | seq_printf(seq, "(S)"); /* spare */ | |
dd8ac336 | 6129 | sectors += rdev->sectors; |
1da177e4 LT |
6130 | } |
6131 | ||
6132 | if (!list_empty(&mddev->disks)) { | |
6133 | if (mddev->pers) | |
6134 | seq_printf(seq, "\n %llu blocks", | |
f233ea5c AN |
6135 | (unsigned long long) |
6136 | mddev->array_sectors / 2); | |
1da177e4 LT |
6137 | else |
6138 | seq_printf(seq, "\n %llu blocks", | |
dd8ac336 | 6139 | (unsigned long long)sectors / 2); |
1da177e4 | 6140 | } |
1cd6bf19 N |
6141 | if (mddev->persistent) { |
6142 | if (mddev->major_version != 0 || | |
6143 | mddev->minor_version != 90) { | |
6144 | seq_printf(seq," super %d.%d", | |
6145 | mddev->major_version, | |
6146 | mddev->minor_version); | |
6147 | } | |
e691063a N |
6148 | } else if (mddev->external) |
6149 | seq_printf(seq, " super external:%s", | |
6150 | mddev->metadata_type); | |
6151 | else | |
1cd6bf19 | 6152 | seq_printf(seq, " super non-persistent"); |
1da177e4 LT |
6153 | |
6154 | if (mddev->pers) { | |
d710e138 | 6155 | mddev->pers->status(seq, mddev); |
1da177e4 | 6156 | seq_printf(seq, "\n "); |
8e1b39d6 N |
6157 | if (mddev->pers->sync_request) { |
6158 | if (mddev->curr_resync > 2) { | |
d710e138 | 6159 | status_resync(seq, mddev); |
8e1b39d6 N |
6160 | seq_printf(seq, "\n "); |
6161 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
6162 | seq_printf(seq, "\tresync=DELAYED\n "); | |
6163 | else if (mddev->recovery_cp < MaxSector) | |
6164 | seq_printf(seq, "\tresync=PENDING\n "); | |
6165 | } | |
32a7627c N |
6166 | } else |
6167 | seq_printf(seq, "\n "); | |
6168 | ||
6169 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
6170 | unsigned long chunk_kb; |
6171 | unsigned long flags; | |
32a7627c | 6172 | spin_lock_irqsave(&bitmap->lock, flags); |
42a04b50 | 6173 | chunk_kb = mddev->bitmap_info.chunksize >> 10; |
32a7627c N |
6174 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " |
6175 | "%lu%s chunk", | |
6176 | bitmap->pages - bitmap->missing_pages, | |
6177 | bitmap->pages, | |
6178 | (bitmap->pages - bitmap->missing_pages) | |
6179 | << (PAGE_SHIFT - 10), | |
42a04b50 | 6180 | chunk_kb ? chunk_kb : mddev->bitmap_info.chunksize, |
32a7627c | 6181 | chunk_kb ? "KB" : "B"); |
78d742d8 N |
6182 | if (bitmap->file) { |
6183 | seq_printf(seq, ", file: "); | |
c32c2f63 | 6184 | seq_path(seq, &bitmap->file->f_path, " \t\n"); |
32a7627c | 6185 | } |
78d742d8 | 6186 | |
32a7627c N |
6187 | seq_printf(seq, "\n"); |
6188 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
6189 | } |
6190 | ||
6191 | seq_printf(seq, "\n"); | |
6192 | } | |
6193 | mddev_unlock(mddev); | |
6194 | ||
6195 | return 0; | |
6196 | } | |
6197 | ||
110518bc | 6198 | static const struct seq_operations md_seq_ops = { |
1da177e4 LT |
6199 | .start = md_seq_start, |
6200 | .next = md_seq_next, | |
6201 | .stop = md_seq_stop, | |
6202 | .show = md_seq_show, | |
6203 | }; | |
6204 | ||
6205 | static int md_seq_open(struct inode *inode, struct file *file) | |
6206 | { | |
6207 | int error; | |
d7603b7e N |
6208 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
6209 | if (mi == NULL) | |
6210 | return -ENOMEM; | |
1da177e4 LT |
6211 | |
6212 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
6213 | if (error) |
6214 | kfree(mi); | |
6215 | else { | |
6216 | struct seq_file *p = file->private_data; | |
6217 | p->private = mi; | |
6218 | mi->event = atomic_read(&md_event_count); | |
6219 | } | |
1da177e4 LT |
6220 | return error; |
6221 | } | |
6222 | ||
d7603b7e N |
6223 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) |
6224 | { | |
6225 | struct seq_file *m = filp->private_data; | |
6226 | struct mdstat_info *mi = m->private; | |
6227 | int mask; | |
6228 | ||
6229 | poll_wait(filp, &md_event_waiters, wait); | |
6230 | ||
6231 | /* always allow read */ | |
6232 | mask = POLLIN | POLLRDNORM; | |
6233 | ||
6234 | if (mi->event != atomic_read(&md_event_count)) | |
6235 | mask |= POLLERR | POLLPRI; | |
6236 | return mask; | |
6237 | } | |
6238 | ||
fa027c2a | 6239 | static const struct file_operations md_seq_fops = { |
e24650c2 | 6240 | .owner = THIS_MODULE, |
1da177e4 LT |
6241 | .open = md_seq_open, |
6242 | .read = seq_read, | |
6243 | .llseek = seq_lseek, | |
c3f94b40 | 6244 | .release = seq_release_private, |
d7603b7e | 6245 | .poll = mdstat_poll, |
1da177e4 LT |
6246 | }; |
6247 | ||
2604b703 | 6248 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 6249 | { |
1da177e4 | 6250 | spin_lock(&pers_lock); |
2604b703 N |
6251 | list_add_tail(&p->list, &pers_list); |
6252 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
6253 | spin_unlock(&pers_lock); |
6254 | return 0; | |
6255 | } | |
6256 | ||
2604b703 | 6257 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 6258 | { |
2604b703 | 6259 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 6260 | spin_lock(&pers_lock); |
2604b703 | 6261 | list_del_init(&p->list); |
1da177e4 LT |
6262 | spin_unlock(&pers_lock); |
6263 | return 0; | |
6264 | } | |
6265 | ||
eea1bf38 | 6266 | static int is_mddev_idle(mddev_t *mddev, int init) |
1da177e4 LT |
6267 | { |
6268 | mdk_rdev_t * rdev; | |
1da177e4 | 6269 | int idle; |
eea1bf38 | 6270 | int curr_events; |
1da177e4 LT |
6271 | |
6272 | idle = 1; | |
4b80991c N |
6273 | rcu_read_lock(); |
6274 | rdev_for_each_rcu(rdev, mddev) { | |
1da177e4 | 6275 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; |
eea1bf38 N |
6276 | curr_events = (int)part_stat_read(&disk->part0, sectors[0]) + |
6277 | (int)part_stat_read(&disk->part0, sectors[1]) - | |
6278 | atomic_read(&disk->sync_io); | |
713f6ab1 N |
6279 | /* sync IO will cause sync_io to increase before the disk_stats |
6280 | * as sync_io is counted when a request starts, and | |
6281 | * disk_stats is counted when it completes. | |
6282 | * So resync activity will cause curr_events to be smaller than | |
6283 | * when there was no such activity. | |
6284 | * non-sync IO will cause disk_stat to increase without | |
6285 | * increasing sync_io so curr_events will (eventually) | |
6286 | * be larger than it was before. Once it becomes | |
6287 | * substantially larger, the test below will cause | |
6288 | * the array to appear non-idle, and resync will slow | |
6289 | * down. | |
6290 | * If there is a lot of outstanding resync activity when | |
6291 | * we set last_event to curr_events, then all that activity | |
6292 | * completing might cause the array to appear non-idle | |
6293 | * and resync will be slowed down even though there might | |
6294 | * not have been non-resync activity. This will only | |
6295 | * happen once though. 'last_events' will soon reflect | |
6296 | * the state where there is little or no outstanding | |
6297 | * resync requests, and further resync activity will | |
6298 | * always make curr_events less than last_events. | |
c0e48521 | 6299 | * |
1da177e4 | 6300 | */ |
eea1bf38 | 6301 | if (init || curr_events - rdev->last_events > 64) { |
1da177e4 LT |
6302 | rdev->last_events = curr_events; |
6303 | idle = 0; | |
6304 | } | |
6305 | } | |
4b80991c | 6306 | rcu_read_unlock(); |
1da177e4 LT |
6307 | return idle; |
6308 | } | |
6309 | ||
6310 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
6311 | { | |
6312 | /* another "blocks" (512byte) blocks have been synced */ | |
6313 | atomic_sub(blocks, &mddev->recovery_active); | |
6314 | wake_up(&mddev->recovery_wait); | |
6315 | if (!ok) { | |
dfc70645 | 6316 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6317 | md_wakeup_thread(mddev->thread); |
6318 | // stop recovery, signal do_sync .... | |
6319 | } | |
6320 | } | |
6321 | ||
6322 | ||
06d91a5f N |
6323 | /* md_write_start(mddev, bi) |
6324 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
6325 | * in superblock) before writing, schedule a superblock update |
6326 | * and wait for it to complete. | |
06d91a5f | 6327 | */ |
3d310eb7 | 6328 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 6329 | { |
0fd62b86 | 6330 | int did_change = 0; |
06d91a5f | 6331 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 6332 | return; |
06d91a5f | 6333 | |
f91de92e N |
6334 | BUG_ON(mddev->ro == 1); |
6335 | if (mddev->ro == 2) { | |
6336 | /* need to switch to read/write */ | |
6337 | mddev->ro = 0; | |
6338 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6339 | md_wakeup_thread(mddev->thread); | |
25156198 | 6340 | md_wakeup_thread(mddev->sync_thread); |
0fd62b86 | 6341 | did_change = 1; |
f91de92e | 6342 | } |
06d91a5f | 6343 | atomic_inc(&mddev->writes_pending); |
31a59e34 N |
6344 | if (mddev->safemode == 1) |
6345 | mddev->safemode = 0; | |
06d91a5f | 6346 | if (mddev->in_sync) { |
a9701a30 | 6347 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
6348 | if (mddev->in_sync) { |
6349 | mddev->in_sync = 0; | |
850b2b42 | 6350 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); |
3d310eb7 | 6351 | md_wakeup_thread(mddev->thread); |
0fd62b86 | 6352 | did_change = 1; |
3d310eb7 | 6353 | } |
a9701a30 | 6354 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 6355 | } |
0fd62b86 | 6356 | if (did_change) |
b62b7590 | 6357 | sysfs_notify_dirent(mddev->sysfs_state); |
09a44cc1 N |
6358 | wait_event(mddev->sb_wait, |
6359 | !test_bit(MD_CHANGE_CLEAN, &mddev->flags) && | |
6360 | !test_bit(MD_CHANGE_PENDING, &mddev->flags)); | |
1da177e4 LT |
6361 | } |
6362 | ||
6363 | void md_write_end(mddev_t *mddev) | |
6364 | { | |
6365 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
6366 | if (mddev->safemode == 2) | |
6367 | md_wakeup_thread(mddev->thread); | |
16f17b39 | 6368 | else if (mddev->safemode_delay) |
1da177e4 LT |
6369 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); |
6370 | } | |
6371 | } | |
6372 | ||
2a2275d6 N |
6373 | /* md_allow_write(mddev) |
6374 | * Calling this ensures that the array is marked 'active' so that writes | |
6375 | * may proceed without blocking. It is important to call this before | |
6376 | * attempting a GFP_KERNEL allocation while holding the mddev lock. | |
6377 | * Must be called with mddev_lock held. | |
b5470dc5 DW |
6378 | * |
6379 | * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock | |
6380 | * is dropped, so return -EAGAIN after notifying userspace. | |
2a2275d6 | 6381 | */ |
b5470dc5 | 6382 | int md_allow_write(mddev_t *mddev) |
2a2275d6 N |
6383 | { |
6384 | if (!mddev->pers) | |
b5470dc5 | 6385 | return 0; |
2a2275d6 | 6386 | if (mddev->ro) |
b5470dc5 | 6387 | return 0; |
1a0fd497 | 6388 | if (!mddev->pers->sync_request) |
b5470dc5 | 6389 | return 0; |
2a2275d6 N |
6390 | |
6391 | spin_lock_irq(&mddev->write_lock); | |
6392 | if (mddev->in_sync) { | |
6393 | mddev->in_sync = 0; | |
6394 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6395 | if (mddev->safemode_delay && | |
6396 | mddev->safemode == 0) | |
6397 | mddev->safemode = 1; | |
6398 | spin_unlock_irq(&mddev->write_lock); | |
6399 | md_update_sb(mddev, 0); | |
b62b7590 | 6400 | sysfs_notify_dirent(mddev->sysfs_state); |
2a2275d6 N |
6401 | } else |
6402 | spin_unlock_irq(&mddev->write_lock); | |
b5470dc5 DW |
6403 | |
6404 | if (test_bit(MD_CHANGE_CLEAN, &mddev->flags)) | |
6405 | return -EAGAIN; | |
6406 | else | |
6407 | return 0; | |
2a2275d6 N |
6408 | } |
6409 | EXPORT_SYMBOL_GPL(md_allow_write); | |
6410 | ||
1da177e4 LT |
6411 | #define SYNC_MARKS 10 |
6412 | #define SYNC_MARK_STEP (3*HZ) | |
29269553 | 6413 | void md_do_sync(mddev_t *mddev) |
1da177e4 LT |
6414 | { |
6415 | mddev_t *mddev2; | |
6416 | unsigned int currspeed = 0, | |
6417 | window; | |
57afd89f | 6418 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
6419 | unsigned long mark[SYNC_MARKS]; |
6420 | sector_t mark_cnt[SYNC_MARKS]; | |
6421 | int last_mark,m; | |
6422 | struct list_head *tmp; | |
6423 | sector_t last_check; | |
57afd89f | 6424 | int skipped = 0; |
5fd6c1dc | 6425 | mdk_rdev_t *rdev; |
61df9d91 | 6426 | char *desc; |
1da177e4 LT |
6427 | |
6428 | /* just incase thread restarts... */ | |
6429 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
6430 | return; | |
5fd6c1dc N |
6431 | if (mddev->ro) /* never try to sync a read-only array */ |
6432 | return; | |
1da177e4 | 6433 | |
61df9d91 N |
6434 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
6435 | if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
6436 | desc = "data-check"; | |
6437 | else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6438 | desc = "requested-resync"; | |
6439 | else | |
6440 | desc = "resync"; | |
6441 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) | |
6442 | desc = "reshape"; | |
6443 | else | |
6444 | desc = "recovery"; | |
6445 | ||
1da177e4 LT |
6446 | /* we overload curr_resync somewhat here. |
6447 | * 0 == not engaged in resync at all | |
6448 | * 2 == checking that there is no conflict with another sync | |
6449 | * 1 == like 2, but have yielded to allow conflicting resync to | |
6450 | * commense | |
6451 | * other == active in resync - this many blocks | |
6452 | * | |
6453 | * Before starting a resync we must have set curr_resync to | |
6454 | * 2, and then checked that every "conflicting" array has curr_resync | |
6455 | * less than ours. When we find one that is the same or higher | |
6456 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
6457 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
6458 | * This will mean we have to start checking from the beginning again. | |
6459 | * | |
6460 | */ | |
6461 | ||
6462 | do { | |
6463 | mddev->curr_resync = 2; | |
6464 | ||
6465 | try_again: | |
787453c2 | 6466 | if (kthread_should_stop()) { |
6985c43f | 6467 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6468 | goto skip; |
6469 | } | |
29ac4aa3 | 6470 | for_each_mddev(mddev2, tmp) { |
1da177e4 LT |
6471 | if (mddev2 == mddev) |
6472 | continue; | |
90b08710 BS |
6473 | if (!mddev->parallel_resync |
6474 | && mddev2->curr_resync | |
6475 | && match_mddev_units(mddev, mddev2)) { | |
1da177e4 LT |
6476 | DEFINE_WAIT(wq); |
6477 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
6478 | /* arbitrarily yield */ | |
6479 | mddev->curr_resync = 1; | |
6480 | wake_up(&resync_wait); | |
6481 | } | |
6482 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
6483 | /* no need to wait here, we can wait the next | |
6484 | * time 'round when curr_resync == 2 | |
6485 | */ | |
6486 | continue; | |
9744197c N |
6487 | /* We need to wait 'interruptible' so as not to |
6488 | * contribute to the load average, and not to | |
6489 | * be caught by 'softlockup' | |
6490 | */ | |
6491 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
787453c2 | 6492 | if (!kthread_should_stop() && |
8712e553 | 6493 | mddev2->curr_resync >= mddev->curr_resync) { |
61df9d91 N |
6494 | printk(KERN_INFO "md: delaying %s of %s" |
6495 | " until %s has finished (they" | |
1da177e4 | 6496 | " share one or more physical units)\n", |
61df9d91 | 6497 | desc, mdname(mddev), mdname(mddev2)); |
1da177e4 | 6498 | mddev_put(mddev2); |
9744197c N |
6499 | if (signal_pending(current)) |
6500 | flush_signals(current); | |
1da177e4 LT |
6501 | schedule(); |
6502 | finish_wait(&resync_wait, &wq); | |
6503 | goto try_again; | |
6504 | } | |
6505 | finish_wait(&resync_wait, &wq); | |
6506 | } | |
6507 | } | |
6508 | } while (mddev->curr_resync < 2); | |
6509 | ||
5fd6c1dc | 6510 | j = 0; |
9d88883e | 6511 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 6512 | /* resync follows the size requested by the personality, |
57afd89f | 6513 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
6514 | */ |
6515 | max_sectors = mddev->resync_max_sectors; | |
9d88883e | 6516 | mddev->resync_mismatches = 0; |
5fd6c1dc | 6517 | /* we don't use the checkpoint if there's a bitmap */ |
5e96ee65 NB |
6518 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
6519 | j = mddev->resync_min; | |
6520 | else if (!mddev->bitmap) | |
5fd6c1dc | 6521 | j = mddev->recovery_cp; |
5e96ee65 | 6522 | |
ccfcc3c1 | 6523 | } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)) |
58c0fed4 | 6524 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6525 | else { |
1da177e4 | 6526 | /* recovery follows the physical size of devices */ |
58c0fed4 | 6527 | max_sectors = mddev->dev_sectors; |
5fd6c1dc | 6528 | j = MaxSector; |
159ec1fc | 6529 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6530 | if (rdev->raid_disk >= 0 && |
6531 | !test_bit(Faulty, &rdev->flags) && | |
6532 | !test_bit(In_sync, &rdev->flags) && | |
6533 | rdev->recovery_offset < j) | |
6534 | j = rdev->recovery_offset; | |
6535 | } | |
1da177e4 | 6536 | |
61df9d91 N |
6537 | printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev)); |
6538 | printk(KERN_INFO "md: minimum _guaranteed_ speed:" | |
6539 | " %d KB/sec/disk.\n", speed_min(mddev)); | |
338cec32 | 6540 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
61df9d91 N |
6541 | "(but not more than %d KB/sec) for %s.\n", |
6542 | speed_max(mddev), desc); | |
1da177e4 | 6543 | |
eea1bf38 | 6544 | is_mddev_idle(mddev, 1); /* this initializes IO event counters */ |
5fd6c1dc | 6545 | |
57afd89f | 6546 | io_sectors = 0; |
1da177e4 LT |
6547 | for (m = 0; m < SYNC_MARKS; m++) { |
6548 | mark[m] = jiffies; | |
57afd89f | 6549 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
6550 | } |
6551 | last_mark = 0; | |
6552 | mddev->resync_mark = mark[last_mark]; | |
6553 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
6554 | ||
6555 | /* | |
6556 | * Tune reconstruction: | |
6557 | */ | |
6558 | window = 32*(PAGE_SIZE/512); | |
6559 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
6560 | window/2,(unsigned long long) max_sectors/2); | |
6561 | ||
6562 | atomic_set(&mddev->recovery_active, 0); | |
1da177e4 LT |
6563 | last_check = 0; |
6564 | ||
6565 | if (j>2) { | |
6566 | printk(KERN_INFO | |
61df9d91 N |
6567 | "md: resuming %s of %s from checkpoint.\n", |
6568 | desc, mdname(mddev)); | |
1da177e4 LT |
6569 | mddev->curr_resync = j; |
6570 | } | |
efa59339 | 6571 | mddev->curr_resync_completed = mddev->curr_resync; |
1da177e4 LT |
6572 | |
6573 | while (j < max_sectors) { | |
57afd89f | 6574 | sector_t sectors; |
1da177e4 | 6575 | |
57afd89f | 6576 | skipped = 0; |
97e4f42d | 6577 | |
7a91ee1f N |
6578 | if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6579 | ((mddev->curr_resync > mddev->curr_resync_completed && | |
6580 | (mddev->curr_resync - mddev->curr_resync_completed) | |
6581 | > (max_sectors >> 4)) || | |
6582 | (j - mddev->curr_resync_completed)*2 | |
6583 | >= mddev->resync_max - mddev->curr_resync_completed | |
6584 | )) { | |
97e4f42d N |
6585 | /* time to update curr_resync_completed */ |
6586 | blk_unplug(mddev->queue); | |
6587 | wait_event(mddev->recovery_wait, | |
6588 | atomic_read(&mddev->recovery_active) == 0); | |
6589 | mddev->curr_resync_completed = | |
6590 | mddev->curr_resync; | |
6591 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
acb180b0 | 6592 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
97e4f42d | 6593 | } |
acb180b0 | 6594 | |
e62e58a5 N |
6595 | while (j >= mddev->resync_max && !kthread_should_stop()) { |
6596 | /* As this condition is controlled by user-space, | |
6597 | * we can block indefinitely, so use '_interruptible' | |
6598 | * to avoid triggering warnings. | |
6599 | */ | |
6600 | flush_signals(current); /* just in case */ | |
6601 | wait_event_interruptible(mddev->recovery_wait, | |
6602 | mddev->resync_max > j | |
6603 | || kthread_should_stop()); | |
6604 | } | |
acb180b0 N |
6605 | |
6606 | if (kthread_should_stop()) | |
6607 | goto interrupted; | |
6608 | ||
57afd89f | 6609 | sectors = mddev->pers->sync_request(mddev, j, &skipped, |
c6207277 | 6610 | currspeed < speed_min(mddev)); |
57afd89f | 6611 | if (sectors == 0) { |
dfc70645 | 6612 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
6613 | goto out; |
6614 | } | |
57afd89f N |
6615 | |
6616 | if (!skipped) { /* actual IO requested */ | |
6617 | io_sectors += sectors; | |
6618 | atomic_add(sectors, &mddev->recovery_active); | |
6619 | } | |
6620 | ||
1da177e4 LT |
6621 | j += sectors; |
6622 | if (j>1) mddev->curr_resync = j; | |
ff4e8d9a | 6623 | mddev->curr_mark_cnt = io_sectors; |
d7603b7e N |
6624 | if (last_check == 0) |
6625 | /* this is the earliers that rebuilt will be | |
6626 | * visible in /proc/mdstat | |
6627 | */ | |
6628 | md_new_event(mddev); | |
57afd89f N |
6629 | |
6630 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
6631 | continue; |
6632 | ||
57afd89f | 6633 | last_check = io_sectors; |
1da177e4 | 6634 | |
dfc70645 | 6635 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
1da177e4 LT |
6636 | break; |
6637 | ||
6638 | repeat: | |
6639 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
6640 | /* step marks */ | |
6641 | int next = (last_mark+1) % SYNC_MARKS; | |
6642 | ||
6643 | mddev->resync_mark = mark[next]; | |
6644 | mddev->resync_mark_cnt = mark_cnt[next]; | |
6645 | mark[next] = jiffies; | |
57afd89f | 6646 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
6647 | last_mark = next; |
6648 | } | |
6649 | ||
6650 | ||
c6207277 N |
6651 | if (kthread_should_stop()) |
6652 | goto interrupted; | |
6653 | ||
1da177e4 LT |
6654 | |
6655 | /* | |
6656 | * this loop exits only if either when we are slower than | |
6657 | * the 'hard' speed limit, or the system was IO-idle for | |
6658 | * a jiffy. | |
6659 | * the system might be non-idle CPU-wise, but we only care | |
6660 | * about not overloading the IO subsystem. (things like an | |
6661 | * e2fsck being done on the RAID array should execute fast) | |
6662 | */ | |
2ad8b1ef | 6663 | blk_unplug(mddev->queue); |
1da177e4 LT |
6664 | cond_resched(); |
6665 | ||
57afd89f N |
6666 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
6667 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 6668 | |
88202a0c N |
6669 | if (currspeed > speed_min(mddev)) { |
6670 | if ((currspeed > speed_max(mddev)) || | |
eea1bf38 | 6671 | !is_mddev_idle(mddev, 0)) { |
c0e48521 | 6672 | msleep(500); |
1da177e4 LT |
6673 | goto repeat; |
6674 | } | |
6675 | } | |
6676 | } | |
61df9d91 | 6677 | printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc); |
1da177e4 LT |
6678 | /* |
6679 | * this also signals 'finished resyncing' to md_stop | |
6680 | */ | |
6681 | out: | |
2ad8b1ef | 6682 | blk_unplug(mddev->queue); |
1da177e4 LT |
6683 | |
6684 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
6685 | ||
6686 | /* tell personality that we are finished */ | |
57afd89f | 6687 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 | 6688 | |
dfc70645 | 6689 | if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) && |
5fd6c1dc N |
6690 | mddev->curr_resync > 2) { |
6691 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
6692 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
6693 | if (mddev->curr_resync >= mddev->recovery_cp) { | |
6694 | printk(KERN_INFO | |
61df9d91 N |
6695 | "md: checkpointing %s of %s.\n", |
6696 | desc, mdname(mddev)); | |
5fd6c1dc N |
6697 | mddev->recovery_cp = mddev->curr_resync; |
6698 | } | |
6699 | } else | |
6700 | mddev->recovery_cp = MaxSector; | |
6701 | } else { | |
6702 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) | |
6703 | mddev->curr_resync = MaxSector; | |
159ec1fc | 6704 | list_for_each_entry(rdev, &mddev->disks, same_set) |
5fd6c1dc N |
6705 | if (rdev->raid_disk >= 0 && |
6706 | !test_bit(Faulty, &rdev->flags) && | |
6707 | !test_bit(In_sync, &rdev->flags) && | |
6708 | rdev->recovery_offset < mddev->curr_resync) | |
6709 | rdev->recovery_offset = mddev->curr_resync; | |
5fd6c1dc | 6710 | } |
1da177e4 | 6711 | } |
17571284 | 6712 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
1da177e4 | 6713 | |
1da177e4 | 6714 | skip: |
c07b70ad N |
6715 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { |
6716 | /* We completed so min/max setting can be forgotten if used. */ | |
6717 | if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6718 | mddev->resync_min = 0; | |
6719 | mddev->resync_max = MaxSector; | |
6720 | } else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
6721 | mddev->resync_min = mddev->curr_resync_completed; | |
1da177e4 | 6722 | mddev->curr_resync = 0; |
efa59339 N |
6723 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) |
6724 | mddev->curr_resync_completed = 0; | |
c6207277 | 6725 | sysfs_notify(&mddev->kobj, NULL, "sync_completed"); |
1da177e4 LT |
6726 | wake_up(&resync_wait); |
6727 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
6728 | md_wakeup_thread(mddev->thread); | |
c6207277 N |
6729 | return; |
6730 | ||
6731 | interrupted: | |
6732 | /* | |
6733 | * got a signal, exit. | |
6734 | */ | |
6735 | printk(KERN_INFO | |
6736 | "md: md_do_sync() got signal ... exiting\n"); | |
6737 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
6738 | goto out; | |
6739 | ||
1da177e4 | 6740 | } |
29269553 | 6741 | EXPORT_SYMBOL_GPL(md_do_sync); |
1da177e4 LT |
6742 | |
6743 | ||
b4c4c7b8 N |
6744 | static int remove_and_add_spares(mddev_t *mddev) |
6745 | { | |
6746 | mdk_rdev_t *rdev; | |
b4c4c7b8 N |
6747 | int spares = 0; |
6748 | ||
97e4f42d N |
6749 | mddev->curr_resync_completed = 0; |
6750 | ||
159ec1fc | 6751 | list_for_each_entry(rdev, &mddev->disks, same_set) |
b4c4c7b8 | 6752 | if (rdev->raid_disk >= 0 && |
6bfe0b49 | 6753 | !test_bit(Blocked, &rdev->flags) && |
b4c4c7b8 N |
6754 | (test_bit(Faulty, &rdev->flags) || |
6755 | ! test_bit(In_sync, &rdev->flags)) && | |
6756 | atomic_read(&rdev->nr_pending)==0) { | |
6757 | if (mddev->pers->hot_remove_disk( | |
6758 | mddev, rdev->raid_disk)==0) { | |
6759 | char nm[20]; | |
6760 | sprintf(nm,"rd%d", rdev->raid_disk); | |
6761 | sysfs_remove_link(&mddev->kobj, nm); | |
6762 | rdev->raid_disk = -1; | |
6763 | } | |
6764 | } | |
6765 | ||
4044ba58 | 6766 | if (mddev->degraded && ! mddev->ro && !mddev->recovery_disabled) { |
159ec1fc | 6767 | list_for_each_entry(rdev, &mddev->disks, same_set) { |
dfc70645 | 6768 | if (rdev->raid_disk >= 0 && |
e5427135 DW |
6769 | !test_bit(In_sync, &rdev->flags) && |
6770 | !test_bit(Blocked, &rdev->flags)) | |
dfc70645 | 6771 | spares++; |
b4c4c7b8 N |
6772 | if (rdev->raid_disk < 0 |
6773 | && !test_bit(Faulty, &rdev->flags)) { | |
6774 | rdev->recovery_offset = 0; | |
199050ea NB |
6775 | if (mddev->pers-> |
6776 | hot_add_disk(mddev, rdev) == 0) { | |
b4c4c7b8 N |
6777 | char nm[20]; |
6778 | sprintf(nm, "rd%d", rdev->raid_disk); | |
5e55e2f5 N |
6779 | if (sysfs_create_link(&mddev->kobj, |
6780 | &rdev->kobj, nm)) | |
6781 | printk(KERN_WARNING | |
6782 | "md: cannot register " | |
6783 | "%s for %s\n", | |
6784 | nm, mdname(mddev)); | |
b4c4c7b8 N |
6785 | spares++; |
6786 | md_new_event(mddev); | |
93be75ff | 6787 | set_bit(MD_CHANGE_DEVS, &mddev->flags); |
b4c4c7b8 N |
6788 | } else |
6789 | break; | |
6790 | } | |
dfc70645 | 6791 | } |
b4c4c7b8 N |
6792 | } |
6793 | return spares; | |
6794 | } | |
1da177e4 LT |
6795 | /* |
6796 | * This routine is regularly called by all per-raid-array threads to | |
6797 | * deal with generic issues like resync and super-block update. | |
6798 | * Raid personalities that don't have a thread (linear/raid0) do not | |
6799 | * need this as they never do any recovery or update the superblock. | |
6800 | * | |
6801 | * It does not do any resync itself, but rather "forks" off other threads | |
6802 | * to do that as needed. | |
6803 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
6804 | * "->recovery" and create a thread at ->sync_thread. | |
dfc70645 | 6805 | * When the thread finishes it sets MD_RECOVERY_DONE |
1da177e4 LT |
6806 | * and wakeups up this thread which will reap the thread and finish up. |
6807 | * This thread also removes any faulty devices (with nr_pending == 0). | |
6808 | * | |
6809 | * The overall approach is: | |
6810 | * 1/ if the superblock needs updating, update it. | |
6811 | * 2/ If a recovery thread is running, don't do anything else. | |
6812 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
6813 | * 4/ If there are any faulty devices, remove them. | |
6814 | * 5/ If array is degraded, try to add spares devices | |
6815 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
6816 | */ | |
6817 | void md_check_recovery(mddev_t *mddev) | |
6818 | { | |
6819 | mdk_rdev_t *rdev; | |
1da177e4 LT |
6820 | |
6821 | ||
5f40402d | 6822 | if (mddev->bitmap) |
aa5cbd10 | 6823 | bitmap_daemon_work(mddev); |
1da177e4 LT |
6824 | |
6825 | if (mddev->ro) | |
6826 | return; | |
fca4d848 N |
6827 | |
6828 | if (signal_pending(current)) { | |
31a59e34 | 6829 | if (mddev->pers->sync_request && !mddev->external) { |
fca4d848 N |
6830 | printk(KERN_INFO "md: %s in immediate safe mode\n", |
6831 | mdname(mddev)); | |
6832 | mddev->safemode = 2; | |
6833 | } | |
6834 | flush_signals(current); | |
6835 | } | |
6836 | ||
c89a8eee N |
6837 | if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) |
6838 | return; | |
1da177e4 | 6839 | if ( ! ( |
e691063a | 6840 | (mddev->flags && !mddev->external) || |
1da177e4 | 6841 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || |
fca4d848 | 6842 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
31a59e34 | 6843 | (mddev->external == 0 && mddev->safemode == 1) || |
fca4d848 N |
6844 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) |
6845 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
6846 | )) |
6847 | return; | |
fca4d848 | 6848 | |
df5b89b3 | 6849 | if (mddev_trylock(mddev)) { |
b4c4c7b8 | 6850 | int spares = 0; |
fca4d848 | 6851 | |
c89a8eee N |
6852 | if (mddev->ro) { |
6853 | /* Only thing we do on a ro array is remove | |
6854 | * failed devices. | |
6855 | */ | |
6856 | remove_and_add_spares(mddev); | |
6857 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6858 | goto unlock; | |
6859 | } | |
6860 | ||
31a59e34 | 6861 | if (!mddev->external) { |
0fd62b86 | 6862 | int did_change = 0; |
31a59e34 N |
6863 | spin_lock_irq(&mddev->write_lock); |
6864 | if (mddev->safemode && | |
6865 | !atomic_read(&mddev->writes_pending) && | |
6866 | !mddev->in_sync && | |
6867 | mddev->recovery_cp == MaxSector) { | |
6868 | mddev->in_sync = 1; | |
0fd62b86 | 6869 | did_change = 1; |
31a59e34 N |
6870 | if (mddev->persistent) |
6871 | set_bit(MD_CHANGE_CLEAN, &mddev->flags); | |
6872 | } | |
6873 | if (mddev->safemode == 1) | |
6874 | mddev->safemode = 0; | |
6875 | spin_unlock_irq(&mddev->write_lock); | |
0fd62b86 | 6876 | if (did_change) |
b62b7590 | 6877 | sysfs_notify_dirent(mddev->sysfs_state); |
fca4d848 | 6878 | } |
fca4d848 | 6879 | |
850b2b42 N |
6880 | if (mddev->flags) |
6881 | md_update_sb(mddev, 0); | |
06d91a5f | 6882 | |
159ec1fc | 6883 | list_for_each_entry(rdev, &mddev->disks, same_set) |
52664732 | 6884 | if (test_and_clear_bit(StateChanged, &rdev->flags)) |
3c0ee63a | 6885 | sysfs_notify_dirent(rdev->sysfs_state); |
52664732 | 6886 | |
06d91a5f | 6887 | |
1da177e4 LT |
6888 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
6889 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
6890 | /* resync/recovery still happening */ | |
6891 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
6892 | goto unlock; | |
6893 | } | |
6894 | if (mddev->sync_thread) { | |
6895 | /* resync has finished, collect result */ | |
6896 | md_unregister_thread(mddev->sync_thread); | |
6897 | mddev->sync_thread = NULL; | |
56ac36d7 DW |
6898 | if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) && |
6899 | !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) { | |
1da177e4 LT |
6900 | /* success...*/ |
6901 | /* activate any spares */ | |
a99ac971 NB |
6902 | if (mddev->pers->spare_active(mddev)) |
6903 | sysfs_notify(&mddev->kobj, NULL, | |
6904 | "degraded"); | |
1da177e4 | 6905 | } |
cea9c228 N |
6906 | if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) && |
6907 | mddev->pers->finish_reshape) | |
6908 | mddev->pers->finish_reshape(mddev); | |
850b2b42 | 6909 | md_update_sb(mddev, 1); |
41158c7e N |
6910 | |
6911 | /* if array is no-longer degraded, then any saved_raid_disk | |
6912 | * information must be scrapped | |
6913 | */ | |
6914 | if (!mddev->degraded) | |
159ec1fc | 6915 | list_for_each_entry(rdev, &mddev->disks, same_set) |
41158c7e N |
6916 | rdev->saved_raid_disk = -1; |
6917 | ||
1da177e4 LT |
6918 | mddev->recovery = 0; |
6919 | /* flag recovery needed just to double check */ | |
6920 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
0c3573f1 | 6921 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6922 | md_new_event(mddev); |
1da177e4 LT |
6923 | goto unlock; |
6924 | } | |
72a23c21 NB |
6925 | /* Set RUNNING before clearing NEEDED to avoid |
6926 | * any transients in the value of "sync_action". | |
6927 | */ | |
6928 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6929 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
24dd469d N |
6930 | /* Clear some bits that don't mean anything, but |
6931 | * might be left set | |
6932 | */ | |
24dd469d N |
6933 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); |
6934 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 | 6935 | |
5fd6c1dc N |
6936 | if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery)) |
6937 | goto unlock; | |
1da177e4 LT |
6938 | /* no recovery is running. |
6939 | * remove any failed drives, then | |
6940 | * add spares if possible. | |
6941 | * Spare are also removed and re-added, to allow | |
6942 | * the personality to fail the re-add. | |
6943 | */ | |
1da177e4 | 6944 | |
b4c4c7b8 | 6945 | if (mddev->reshape_position != MaxSector) { |
50ac168a N |
6946 | if (mddev->pers->check_reshape == NULL || |
6947 | mddev->pers->check_reshape(mddev) != 0) | |
b4c4c7b8 N |
6948 | /* Cannot proceed */ |
6949 | goto unlock; | |
6950 | set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery); | |
72a23c21 | 6951 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
b4c4c7b8 | 6952 | } else if ((spares = remove_and_add_spares(mddev))) { |
24dd469d N |
6953 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); |
6954 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
56ac36d7 | 6955 | clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); |
72a23c21 | 6956 | set_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6957 | } else if (mddev->recovery_cp < MaxSector) { |
6958 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
72a23c21 | 6959 | clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery); |
24dd469d N |
6960 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) |
6961 | /* nothing to be done ... */ | |
1da177e4 | 6962 | goto unlock; |
24dd469d | 6963 | |
1da177e4 | 6964 | if (mddev->pers->sync_request) { |
a654b9d8 N |
6965 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
6966 | /* We are adding a device or devices to an array | |
6967 | * which has the bitmap stored on all devices. | |
6968 | * So make sure all bitmap pages get written | |
6969 | */ | |
6970 | bitmap_write_all(mddev->bitmap); | |
6971 | } | |
1da177e4 LT |
6972 | mddev->sync_thread = md_register_thread(md_do_sync, |
6973 | mddev, | |
0da3c619 | 6974 | "resync"); |
1da177e4 LT |
6975 | if (!mddev->sync_thread) { |
6976 | printk(KERN_ERR "%s: could not start resync" | |
6977 | " thread...\n", | |
6978 | mdname(mddev)); | |
6979 | /* leave the spares where they are, it shouldn't hurt */ | |
6980 | mddev->recovery = 0; | |
d7603b7e | 6981 | } else |
1da177e4 | 6982 | md_wakeup_thread(mddev->sync_thread); |
0c3573f1 | 6983 | sysfs_notify_dirent(mddev->sysfs_action); |
d7603b7e | 6984 | md_new_event(mddev); |
1da177e4 LT |
6985 | } |
6986 | unlock: | |
72a23c21 NB |
6987 | if (!mddev->sync_thread) { |
6988 | clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
6989 | if (test_and_clear_bit(MD_RECOVERY_RECOVER, | |
6990 | &mddev->recovery)) | |
0c3573f1 N |
6991 | if (mddev->sysfs_action) |
6992 | sysfs_notify_dirent(mddev->sysfs_action); | |
72a23c21 | 6993 | } |
1da177e4 LT |
6994 | mddev_unlock(mddev); |
6995 | } | |
6996 | } | |
6997 | ||
6bfe0b49 DW |
6998 | void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev) |
6999 | { | |
3c0ee63a | 7000 | sysfs_notify_dirent(rdev->sysfs_state); |
6bfe0b49 DW |
7001 | wait_event_timeout(rdev->blocked_wait, |
7002 | !test_bit(Blocked, &rdev->flags), | |
7003 | msecs_to_jiffies(5000)); | |
7004 | rdev_dec_pending(rdev, mddev); | |
7005 | } | |
7006 | EXPORT_SYMBOL(md_wait_for_blocked_rdev); | |
7007 | ||
75c96f85 AB |
7008 | static int md_notify_reboot(struct notifier_block *this, |
7009 | unsigned long code, void *x) | |
1da177e4 LT |
7010 | { |
7011 | struct list_head *tmp; | |
7012 | mddev_t *mddev; | |
7013 | ||
7014 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
7015 | ||
7016 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
7017 | ||
29ac4aa3 | 7018 | for_each_mddev(mddev, tmp) |
c71d4887 | 7019 | if (mddev_trylock(mddev)) { |
2b25000b N |
7020 | /* Force a switch to readonly even array |
7021 | * appears to still be in use. Hence | |
7022 | * the '100'. | |
7023 | */ | |
d710e138 | 7024 | do_md_stop(mddev, 1, 100); |
c71d4887 NB |
7025 | mddev_unlock(mddev); |
7026 | } | |
1da177e4 LT |
7027 | /* |
7028 | * certain more exotic SCSI devices are known to be | |
7029 | * volatile wrt too early system reboots. While the | |
7030 | * right place to handle this issue is the given | |
7031 | * driver, we do want to have a safe RAID driver ... | |
7032 | */ | |
7033 | mdelay(1000*1); | |
7034 | } | |
7035 | return NOTIFY_DONE; | |
7036 | } | |
7037 | ||
75c96f85 | 7038 | static struct notifier_block md_notifier = { |
1da177e4 LT |
7039 | .notifier_call = md_notify_reboot, |
7040 | .next = NULL, | |
7041 | .priority = INT_MAX, /* before any real devices */ | |
7042 | }; | |
7043 | ||
7044 | static void md_geninit(void) | |
7045 | { | |
1da177e4 LT |
7046 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); |
7047 | ||
c7705f34 | 7048 | proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops); |
1da177e4 LT |
7049 | } |
7050 | ||
75c96f85 | 7051 | static int __init md_init(void) |
1da177e4 | 7052 | { |
3dbd8c2e | 7053 | if (register_blkdev(MD_MAJOR, "md")) |
1da177e4 LT |
7054 | return -1; |
7055 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
3dbd8c2e | 7056 | unregister_blkdev(MD_MAJOR, "md"); |
1da177e4 LT |
7057 | return -1; |
7058 | } | |
3dbd8c2e | 7059 | blk_register_region(MKDEV(MD_MAJOR, 0), 1UL<<MINORBITS, THIS_MODULE, |
e8703fe1 N |
7060 | md_probe, NULL, NULL); |
7061 | blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE, | |
1da177e4 LT |
7062 | md_probe, NULL, NULL); |
7063 | ||
1da177e4 | 7064 | register_reboot_notifier(&md_notifier); |
0b4d4147 | 7065 | raid_table_header = register_sysctl_table(raid_root_table); |
1da177e4 LT |
7066 | |
7067 | md_geninit(); | |
d710e138 | 7068 | return 0; |
1da177e4 LT |
7069 | } |
7070 | ||
7071 | ||
7072 | #ifndef MODULE | |
7073 | ||
7074 | /* | |
7075 | * Searches all registered partitions for autorun RAID arrays | |
7076 | * at boot time. | |
7077 | */ | |
4d936ec1 ME |
7078 | |
7079 | static LIST_HEAD(all_detected_devices); | |
7080 | struct detected_devices_node { | |
7081 | struct list_head list; | |
7082 | dev_t dev; | |
7083 | }; | |
1da177e4 LT |
7084 | |
7085 | void md_autodetect_dev(dev_t dev) | |
7086 | { | |
4d936ec1 ME |
7087 | struct detected_devices_node *node_detected_dev; |
7088 | ||
7089 | node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL); | |
7090 | if (node_detected_dev) { | |
7091 | node_detected_dev->dev = dev; | |
7092 | list_add_tail(&node_detected_dev->list, &all_detected_devices); | |
7093 | } else { | |
7094 | printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed" | |
7095 | ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev)); | |
7096 | } | |
1da177e4 LT |
7097 | } |
7098 | ||
7099 | ||
7100 | static void autostart_arrays(int part) | |
7101 | { | |
7102 | mdk_rdev_t *rdev; | |
4d936ec1 ME |
7103 | struct detected_devices_node *node_detected_dev; |
7104 | dev_t dev; | |
7105 | int i_scanned, i_passed; | |
1da177e4 | 7106 | |
4d936ec1 ME |
7107 | i_scanned = 0; |
7108 | i_passed = 0; | |
1da177e4 | 7109 | |
4d936ec1 | 7110 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); |
1da177e4 | 7111 | |
4d936ec1 ME |
7112 | while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) { |
7113 | i_scanned++; | |
7114 | node_detected_dev = list_entry(all_detected_devices.next, | |
7115 | struct detected_devices_node, list); | |
7116 | list_del(&node_detected_dev->list); | |
7117 | dev = node_detected_dev->dev; | |
7118 | kfree(node_detected_dev); | |
df968c4e | 7119 | rdev = md_import_device(dev,0, 90); |
1da177e4 LT |
7120 | if (IS_ERR(rdev)) |
7121 | continue; | |
7122 | ||
b2d444d7 | 7123 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
7124 | MD_BUG(); |
7125 | continue; | |
7126 | } | |
d0fae18f | 7127 | set_bit(AutoDetected, &rdev->flags); |
1da177e4 | 7128 | list_add(&rdev->same_set, &pending_raid_disks); |
4d936ec1 | 7129 | i_passed++; |
1da177e4 | 7130 | } |
4d936ec1 ME |
7131 | |
7132 | printk(KERN_INFO "md: Scanned %d and added %d devices.\n", | |
7133 | i_scanned, i_passed); | |
1da177e4 LT |
7134 | |
7135 | autorun_devices(part); | |
7136 | } | |
7137 | ||
fdee8ae4 | 7138 | #endif /* !MODULE */ |
1da177e4 LT |
7139 | |
7140 | static __exit void md_exit(void) | |
7141 | { | |
7142 | mddev_t *mddev; | |
7143 | struct list_head *tmp; | |
8ab5e4c1 | 7144 | |
3dbd8c2e | 7145 | blk_unregister_region(MKDEV(MD_MAJOR,0), 1U << MINORBITS); |
e8703fe1 | 7146 | blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS); |
1da177e4 | 7147 | |
3dbd8c2e | 7148 | unregister_blkdev(MD_MAJOR,"md"); |
1da177e4 LT |
7149 | unregister_blkdev(mdp_major, "mdp"); |
7150 | unregister_reboot_notifier(&md_notifier); | |
7151 | unregister_sysctl_table(raid_table_header); | |
7152 | remove_proc_entry("mdstat", NULL); | |
29ac4aa3 | 7153 | for_each_mddev(mddev, tmp) { |
1da177e4 | 7154 | export_array(mddev); |
d3374825 | 7155 | mddev->hold_active = 0; |
1da177e4 LT |
7156 | } |
7157 | } | |
7158 | ||
685784aa | 7159 | subsys_initcall(md_init); |
1da177e4 LT |
7160 | module_exit(md_exit) |
7161 | ||
f91de92e N |
7162 | static int get_ro(char *buffer, struct kernel_param *kp) |
7163 | { | |
7164 | return sprintf(buffer, "%d", start_readonly); | |
7165 | } | |
7166 | static int set_ro(const char *val, struct kernel_param *kp) | |
7167 | { | |
7168 | char *e; | |
7169 | int num = simple_strtoul(val, &e, 10); | |
7170 | if (*val && (*e == '\0' || *e == '\n')) { | |
7171 | start_readonly = num; | |
4dbcdc75 | 7172 | return 0; |
f91de92e N |
7173 | } |
7174 | return -EINVAL; | |
7175 | } | |
7176 | ||
80ca3a44 N |
7177 | module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR); |
7178 | module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR); | |
6ff8d8ec | 7179 | |
efeb53c0 | 7180 | module_param_call(new_array, add_named_array, NULL, NULL, S_IWUSR); |
f91de92e | 7181 | |
1da177e4 LT |
7182 | EXPORT_SYMBOL(register_md_personality); |
7183 | EXPORT_SYMBOL(unregister_md_personality); | |
7184 | EXPORT_SYMBOL(md_error); | |
7185 | EXPORT_SYMBOL(md_done_sync); | |
7186 | EXPORT_SYMBOL(md_write_start); | |
7187 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
7188 | EXPORT_SYMBOL(md_register_thread); |
7189 | EXPORT_SYMBOL(md_unregister_thread); | |
7190 | EXPORT_SYMBOL(md_wakeup_thread); | |
1da177e4 LT |
7191 | EXPORT_SYMBOL(md_check_recovery); |
7192 | MODULE_LICENSE("GPL"); | |
0efb9e61 | 7193 | MODULE_DESCRIPTION("MD RAID framework"); |
aa1595e9 | 7194 | MODULE_ALIAS("md"); |
72008652 | 7195 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |