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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 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/config.h> | |
a6fb0934 | 37 | #include <linux/kthread.h> |
1da177e4 LT |
38 | #include <linux/linkage.h> |
39 | #include <linux/raid/md.h> | |
32a7627c | 40 | #include <linux/raid/bitmap.h> |
1da177e4 LT |
41 | #include <linux/sysctl.h> |
42 | #include <linux/devfs_fs_kernel.h> | |
43 | #include <linux/buffer_head.h> /* for invalidate_bdev */ | |
44 | #include <linux/suspend.h> | |
d7603b7e | 45 | #include <linux/poll.h> |
1da177e4 LT |
46 | |
47 | #include <linux/init.h> | |
48 | ||
32a7627c N |
49 | #include <linux/file.h> |
50 | ||
1da177e4 LT |
51 | #ifdef CONFIG_KMOD |
52 | #include <linux/kmod.h> | |
53 | #endif | |
54 | ||
55 | #include <asm/unaligned.h> | |
56 | ||
57 | #define MAJOR_NR MD_MAJOR | |
58 | #define MD_DRIVER | |
59 | ||
60 | /* 63 partitions with the alternate major number (mdp) */ | |
61 | #define MdpMinorShift 6 | |
62 | ||
63 | #define DEBUG 0 | |
64 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
65 | ||
66 | ||
67 | #ifndef MODULE | |
68 | static void autostart_arrays (int part); | |
69 | #endif | |
70 | ||
2604b703 | 71 | static LIST_HEAD(pers_list); |
1da177e4 LT |
72 | static DEFINE_SPINLOCK(pers_lock); |
73 | ||
74 | /* | |
75 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
76 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
77 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 78 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
79 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
80 | * speed limit - in case reconstruction slows down your system despite | |
81 | * idle IO detection. | |
82 | * | |
83 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
84 | */ | |
85 | ||
86 | static int sysctl_speed_limit_min = 1000; | |
87 | static int sysctl_speed_limit_max = 200000; | |
88 | ||
89 | static struct ctl_table_header *raid_table_header; | |
90 | ||
91 | static ctl_table raid_table[] = { | |
92 | { | |
93 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
94 | .procname = "speed_limit_min", | |
95 | .data = &sysctl_speed_limit_min, | |
96 | .maxlen = sizeof(int), | |
97 | .mode = 0644, | |
98 | .proc_handler = &proc_dointvec, | |
99 | }, | |
100 | { | |
101 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
102 | .procname = "speed_limit_max", | |
103 | .data = &sysctl_speed_limit_max, | |
104 | .maxlen = sizeof(int), | |
105 | .mode = 0644, | |
106 | .proc_handler = &proc_dointvec, | |
107 | }, | |
108 | { .ctl_name = 0 } | |
109 | }; | |
110 | ||
111 | static ctl_table raid_dir_table[] = { | |
112 | { | |
113 | .ctl_name = DEV_RAID, | |
114 | .procname = "raid", | |
115 | .maxlen = 0, | |
116 | .mode = 0555, | |
117 | .child = raid_table, | |
118 | }, | |
119 | { .ctl_name = 0 } | |
120 | }; | |
121 | ||
122 | static ctl_table raid_root_table[] = { | |
123 | { | |
124 | .ctl_name = CTL_DEV, | |
125 | .procname = "dev", | |
126 | .maxlen = 0, | |
127 | .mode = 0555, | |
128 | .child = raid_dir_table, | |
129 | }, | |
130 | { .ctl_name = 0 } | |
131 | }; | |
132 | ||
133 | static struct block_device_operations md_fops; | |
134 | ||
f91de92e N |
135 | static int start_readonly; |
136 | ||
d7603b7e N |
137 | /* |
138 | * We have a system wide 'event count' that is incremented | |
139 | * on any 'interesting' event, and readers of /proc/mdstat | |
140 | * can use 'poll' or 'select' to find out when the event | |
141 | * count increases. | |
142 | * | |
143 | * Events are: | |
144 | * start array, stop array, error, add device, remove device, | |
145 | * start build, activate spare | |
146 | */ | |
2989ddbd | 147 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 148 | static atomic_t md_event_count; |
07dbd377 | 149 | static void md_new_event(mddev_t *mddev) |
d7603b7e N |
150 | { |
151 | atomic_inc(&md_event_count); | |
152 | wake_up(&md_event_waiters); | |
153 | } | |
154 | ||
1da177e4 LT |
155 | /* |
156 | * Enables to iterate over all existing md arrays | |
157 | * all_mddevs_lock protects this list. | |
158 | */ | |
159 | static LIST_HEAD(all_mddevs); | |
160 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
161 | ||
162 | ||
163 | /* | |
164 | * iterates through all used mddevs in the system. | |
165 | * We take care to grab the all_mddevs_lock whenever navigating | |
166 | * the list, and to always hold a refcount when unlocked. | |
167 | * Any code which breaks out of this loop while own | |
168 | * a reference to the current mddev and must mddev_put it. | |
169 | */ | |
170 | #define ITERATE_MDDEV(mddev,tmp) \ | |
171 | \ | |
172 | for (({ spin_lock(&all_mddevs_lock); \ | |
173 | tmp = all_mddevs.next; \ | |
174 | mddev = NULL;}); \ | |
175 | ({ if (tmp != &all_mddevs) \ | |
176 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
177 | spin_unlock(&all_mddevs_lock); \ | |
178 | if (mddev) mddev_put(mddev); \ | |
179 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
180 | tmp != &all_mddevs;}); \ | |
181 | ({ spin_lock(&all_mddevs_lock); \ | |
182 | tmp = tmp->next;}) \ | |
183 | ) | |
184 | ||
185 | ||
186 | static int md_fail_request (request_queue_t *q, struct bio *bio) | |
187 | { | |
188 | bio_io_error(bio, bio->bi_size); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
193 | { | |
194 | atomic_inc(&mddev->active); | |
195 | return mddev; | |
196 | } | |
197 | ||
198 | static void mddev_put(mddev_t *mddev) | |
199 | { | |
200 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
201 | return; | |
202 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
203 | list_del(&mddev->all_mddevs); | |
204 | blk_put_queue(mddev->queue); | |
eae1701f | 205 | kobject_unregister(&mddev->kobj); |
1da177e4 LT |
206 | } |
207 | spin_unlock(&all_mddevs_lock); | |
208 | } | |
209 | ||
210 | static mddev_t * mddev_find(dev_t unit) | |
211 | { | |
212 | mddev_t *mddev, *new = NULL; | |
213 | ||
214 | retry: | |
215 | spin_lock(&all_mddevs_lock); | |
216 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
217 | if (mddev->unit == unit) { | |
218 | mddev_get(mddev); | |
219 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 220 | kfree(new); |
1da177e4 LT |
221 | return mddev; |
222 | } | |
223 | ||
224 | if (new) { | |
225 | list_add(&new->all_mddevs, &all_mddevs); | |
226 | spin_unlock(&all_mddevs_lock); | |
227 | return new; | |
228 | } | |
229 | spin_unlock(&all_mddevs_lock); | |
230 | ||
9ffae0cf | 231 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
232 | if (!new) |
233 | return NULL; | |
234 | ||
1da177e4 LT |
235 | new->unit = unit; |
236 | if (MAJOR(unit) == MD_MAJOR) | |
237 | new->md_minor = MINOR(unit); | |
238 | else | |
239 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
240 | ||
241 | init_MUTEX(&new->reconfig_sem); | |
242 | INIT_LIST_HEAD(&new->disks); | |
243 | INIT_LIST_HEAD(&new->all_mddevs); | |
244 | init_timer(&new->safemode_timer); | |
245 | atomic_set(&new->active, 1); | |
06d91a5f | 246 | spin_lock_init(&new->write_lock); |
3d310eb7 | 247 | init_waitqueue_head(&new->sb_wait); |
1da177e4 LT |
248 | |
249 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
250 | if (!new->queue) { | |
251 | kfree(new); | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | blk_queue_make_request(new->queue, md_fail_request); | |
256 | ||
257 | goto retry; | |
258 | } | |
259 | ||
260 | static inline int mddev_lock(mddev_t * mddev) | |
261 | { | |
262 | return down_interruptible(&mddev->reconfig_sem); | |
263 | } | |
264 | ||
265 | static inline void mddev_lock_uninterruptible(mddev_t * mddev) | |
266 | { | |
267 | down(&mddev->reconfig_sem); | |
268 | } | |
269 | ||
270 | static inline int mddev_trylock(mddev_t * mddev) | |
271 | { | |
272 | return down_trylock(&mddev->reconfig_sem); | |
273 | } | |
274 | ||
275 | static inline void mddev_unlock(mddev_t * mddev) | |
276 | { | |
277 | up(&mddev->reconfig_sem); | |
278 | ||
005eca5e | 279 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
280 | } |
281 | ||
2989ddbd | 282 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 LT |
283 | { |
284 | mdk_rdev_t * rdev; | |
285 | struct list_head *tmp; | |
286 | ||
287 | ITERATE_RDEV(mddev,rdev,tmp) { | |
288 | if (rdev->desc_nr == nr) | |
289 | return rdev; | |
290 | } | |
291 | return NULL; | |
292 | } | |
293 | ||
294 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
295 | { | |
296 | struct list_head *tmp; | |
297 | mdk_rdev_t *rdev; | |
298 | ||
299 | ITERATE_RDEV(mddev,rdev,tmp) { | |
300 | if (rdev->bdev->bd_dev == dev) | |
301 | return rdev; | |
302 | } | |
303 | return NULL; | |
304 | } | |
305 | ||
d9d166c2 | 306 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
307 | { |
308 | struct mdk_personality *pers; | |
d9d166c2 N |
309 | list_for_each_entry(pers, &pers_list, list) { |
310 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 311 | return pers; |
d9d166c2 N |
312 | if (strcmp(pers->name, clevel)==0) |
313 | return pers; | |
314 | } | |
2604b703 N |
315 | return NULL; |
316 | } | |
317 | ||
77933d72 | 318 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 LT |
319 | { |
320 | sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
321 | return MD_NEW_SIZE_BLOCKS(size); | |
322 | } | |
323 | ||
324 | static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) | |
325 | { | |
326 | sector_t size; | |
327 | ||
328 | size = rdev->sb_offset; | |
329 | ||
330 | if (chunk_size) | |
331 | size &= ~((sector_t)chunk_size/1024 - 1); | |
332 | return size; | |
333 | } | |
334 | ||
335 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
336 | { | |
337 | if (rdev->sb_page) | |
338 | MD_BUG(); | |
339 | ||
340 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
341 | if (!rdev->sb_page) { | |
342 | printk(KERN_ALERT "md: out of memory.\n"); | |
343 | return -EINVAL; | |
344 | } | |
345 | ||
346 | return 0; | |
347 | } | |
348 | ||
349 | static void free_disk_sb(mdk_rdev_t * rdev) | |
350 | { | |
351 | if (rdev->sb_page) { | |
2d1f3b5d | 352 | put_page(rdev->sb_page); |
1da177e4 LT |
353 | rdev->sb_loaded = 0; |
354 | rdev->sb_page = NULL; | |
355 | rdev->sb_offset = 0; | |
356 | rdev->size = 0; | |
357 | } | |
358 | } | |
359 | ||
360 | ||
7bfa19f2 N |
361 | static int super_written(struct bio *bio, unsigned int bytes_done, int error) |
362 | { | |
363 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 364 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 N |
365 | if (bio->bi_size) |
366 | return 1; | |
367 | ||
368 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
a9701a30 | 369 | md_error(mddev, rdev); |
7bfa19f2 | 370 | |
a9701a30 N |
371 | if (atomic_dec_and_test(&mddev->pending_writes)) |
372 | wake_up(&mddev->sb_wait); | |
f8b58edf | 373 | bio_put(bio); |
7bfa19f2 N |
374 | return 0; |
375 | } | |
376 | ||
a9701a30 N |
377 | static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) |
378 | { | |
379 | struct bio *bio2 = bio->bi_private; | |
380 | mdk_rdev_t *rdev = bio2->bi_private; | |
381 | mddev_t *mddev = rdev->mddev; | |
382 | if (bio->bi_size) | |
383 | return 1; | |
384 | ||
385 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
386 | error == -EOPNOTSUPP) { | |
387 | unsigned long flags; | |
388 | /* barriers don't appear to be supported :-( */ | |
389 | set_bit(BarriersNotsupp, &rdev->flags); | |
390 | mddev->barriers_work = 0; | |
391 | spin_lock_irqsave(&mddev->write_lock, flags); | |
392 | bio2->bi_next = mddev->biolist; | |
393 | mddev->biolist = bio2; | |
394 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
395 | wake_up(&mddev->sb_wait); | |
396 | bio_put(bio); | |
397 | return 0; | |
398 | } | |
399 | bio_put(bio2); | |
400 | bio->bi_private = rdev; | |
401 | return super_written(bio, bytes_done, error); | |
402 | } | |
403 | ||
7bfa19f2 N |
404 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
405 | sector_t sector, int size, struct page *page) | |
406 | { | |
407 | /* write first size bytes of page to sector of rdev | |
408 | * Increment mddev->pending_writes before returning | |
409 | * and decrement it on completion, waking up sb_wait | |
410 | * if zero is reached. | |
411 | * If an error occurred, call md_error | |
a9701a30 N |
412 | * |
413 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
414 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
415 | */ |
416 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 417 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
418 | |
419 | bio->bi_bdev = rdev->bdev; | |
420 | bio->bi_sector = sector; | |
421 | bio_add_page(bio, page, size, 0); | |
422 | bio->bi_private = rdev; | |
423 | bio->bi_end_io = super_written; | |
a9701a30 N |
424 | bio->bi_rw = rw; |
425 | ||
7bfa19f2 | 426 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
427 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
428 | struct bio *rbio; | |
429 | rw |= (1<<BIO_RW_BARRIER); | |
430 | rbio = bio_clone(bio, GFP_NOIO); | |
431 | rbio->bi_private = bio; | |
432 | rbio->bi_end_io = super_written_barrier; | |
433 | submit_bio(rw, rbio); | |
434 | } else | |
435 | submit_bio(rw, bio); | |
436 | } | |
437 | ||
438 | void md_super_wait(mddev_t *mddev) | |
439 | { | |
440 | /* wait for all superblock writes that were scheduled to complete. | |
441 | * if any had to be retried (due to BARRIER problems), retry them | |
442 | */ | |
443 | DEFINE_WAIT(wq); | |
444 | for(;;) { | |
445 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
446 | if (atomic_read(&mddev->pending_writes)==0) | |
447 | break; | |
448 | while (mddev->biolist) { | |
449 | struct bio *bio; | |
450 | spin_lock_irq(&mddev->write_lock); | |
451 | bio = mddev->biolist; | |
452 | mddev->biolist = bio->bi_next ; | |
453 | bio->bi_next = NULL; | |
454 | spin_unlock_irq(&mddev->write_lock); | |
455 | submit_bio(bio->bi_rw, bio); | |
456 | } | |
457 | schedule(); | |
458 | } | |
459 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
460 | } |
461 | ||
1da177e4 LT |
462 | static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) |
463 | { | |
464 | if (bio->bi_size) | |
465 | return 1; | |
466 | ||
467 | complete((struct completion*)bio->bi_private); | |
468 | return 0; | |
469 | } | |
470 | ||
a654b9d8 | 471 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
472 | struct page *page, int rw) |
473 | { | |
baaa2c51 | 474 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
475 | struct completion event; |
476 | int ret; | |
477 | ||
478 | rw |= (1 << BIO_RW_SYNC); | |
479 | ||
480 | bio->bi_bdev = bdev; | |
481 | bio->bi_sector = sector; | |
482 | bio_add_page(bio, page, size, 0); | |
483 | init_completion(&event); | |
484 | bio->bi_private = &event; | |
485 | bio->bi_end_io = bi_complete; | |
486 | submit_bio(rw, bio); | |
487 | wait_for_completion(&event); | |
488 | ||
489 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
490 | bio_put(bio); | |
491 | return ret; | |
492 | } | |
a8745db2 | 493 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 494 | |
0002b271 | 495 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
496 | { |
497 | char b[BDEVNAME_SIZE]; | |
498 | if (!rdev->sb_page) { | |
499 | MD_BUG(); | |
500 | return -EINVAL; | |
501 | } | |
502 | if (rdev->sb_loaded) | |
503 | return 0; | |
504 | ||
505 | ||
0002b271 | 506 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
507 | goto fail; |
508 | rdev->sb_loaded = 1; | |
509 | return 0; | |
510 | ||
511 | fail: | |
512 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
513 | bdevname(rdev->bdev,b)); | |
514 | return -EINVAL; | |
515 | } | |
516 | ||
517 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
518 | { | |
519 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
520 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
521 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
522 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
523 | ||
524 | return 1; | |
525 | ||
526 | return 0; | |
527 | } | |
528 | ||
529 | ||
530 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
531 | { | |
532 | int ret; | |
533 | mdp_super_t *tmp1, *tmp2; | |
534 | ||
535 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
536 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
537 | ||
538 | if (!tmp1 || !tmp2) { | |
539 | ret = 0; | |
540 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
541 | goto abort; | |
542 | } | |
543 | ||
544 | *tmp1 = *sb1; | |
545 | *tmp2 = *sb2; | |
546 | ||
547 | /* | |
548 | * nr_disks is not constant | |
549 | */ | |
550 | tmp1->nr_disks = 0; | |
551 | tmp2->nr_disks = 0; | |
552 | ||
553 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
554 | ret = 0; | |
555 | else | |
556 | ret = 1; | |
557 | ||
558 | abort: | |
990a8baf JJ |
559 | kfree(tmp1); |
560 | kfree(tmp2); | |
1da177e4 LT |
561 | return ret; |
562 | } | |
563 | ||
564 | static unsigned int calc_sb_csum(mdp_super_t * sb) | |
565 | { | |
566 | unsigned int disk_csum, csum; | |
567 | ||
568 | disk_csum = sb->sb_csum; | |
569 | sb->sb_csum = 0; | |
570 | csum = csum_partial((void *)sb, MD_SB_BYTES, 0); | |
571 | sb->sb_csum = disk_csum; | |
572 | return csum; | |
573 | } | |
574 | ||
575 | ||
576 | /* | |
577 | * Handle superblock details. | |
578 | * We want to be able to handle multiple superblock formats | |
579 | * so we have a common interface to them all, and an array of | |
580 | * different handlers. | |
581 | * We rely on user-space to write the initial superblock, and support | |
582 | * reading and updating of superblocks. | |
583 | * Interface methods are: | |
584 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
585 | * loads and validates a superblock on dev. | |
586 | * if refdev != NULL, compare superblocks on both devices | |
587 | * Return: | |
588 | * 0 - dev has a superblock that is compatible with refdev | |
589 | * 1 - dev has a superblock that is compatible and newer than refdev | |
590 | * so dev should be used as the refdev in future | |
591 | * -EINVAL superblock incompatible or invalid | |
592 | * -othererror e.g. -EIO | |
593 | * | |
594 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
595 | * Verify that dev is acceptable into mddev. | |
596 | * The first time, mddev->raid_disks will be 0, and data from | |
597 | * dev should be merged in. Subsequent calls check that dev | |
598 | * is new enough. Return 0 or -EINVAL | |
599 | * | |
600 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
601 | * Update the superblock for rdev with data in mddev | |
602 | * This does not write to disc. | |
603 | * | |
604 | */ | |
605 | ||
606 | struct super_type { | |
607 | char *name; | |
608 | struct module *owner; | |
609 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
610 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
611 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
612 | }; | |
613 | ||
614 | /* | |
615 | * load_super for 0.90.0 | |
616 | */ | |
617 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
618 | { | |
619 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
620 | mdp_super_t *sb; | |
621 | int ret; | |
622 | sector_t sb_offset; | |
623 | ||
624 | /* | |
625 | * Calculate the position of the superblock, | |
626 | * it's at the end of the disk. | |
627 | * | |
628 | * It also happens to be a multiple of 4Kb. | |
629 | */ | |
630 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
631 | rdev->sb_offset = sb_offset; | |
632 | ||
0002b271 | 633 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
634 | if (ret) return ret; |
635 | ||
636 | ret = -EINVAL; | |
637 | ||
638 | bdevname(rdev->bdev, b); | |
639 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
640 | ||
641 | if (sb->md_magic != MD_SB_MAGIC) { | |
642 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
643 | b); | |
644 | goto abort; | |
645 | } | |
646 | ||
647 | if (sb->major_version != 0 || | |
648 | sb->minor_version != 90) { | |
649 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", | |
650 | sb->major_version, sb->minor_version, | |
651 | b); | |
652 | goto abort; | |
653 | } | |
654 | ||
655 | if (sb->raid_disks <= 0) | |
656 | goto abort; | |
657 | ||
658 | if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) { | |
659 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", | |
660 | b); | |
661 | goto abort; | |
662 | } | |
663 | ||
664 | rdev->preferred_minor = sb->md_minor; | |
665 | rdev->data_offset = 0; | |
0002b271 | 666 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
667 | |
668 | if (sb->level == LEVEL_MULTIPATH) | |
669 | rdev->desc_nr = -1; | |
670 | else | |
671 | rdev->desc_nr = sb->this_disk.number; | |
672 | ||
673 | if (refdev == 0) | |
674 | ret = 1; | |
675 | else { | |
676 | __u64 ev1, ev2; | |
677 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
678 | if (!uuid_equal(refsb, sb)) { | |
679 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
680 | b, bdevname(refdev->bdev,b2)); | |
681 | goto abort; | |
682 | } | |
683 | if (!sb_equal(refsb, sb)) { | |
684 | printk(KERN_WARNING "md: %s has same UUID" | |
685 | " but different superblock to %s\n", | |
686 | b, bdevname(refdev->bdev, b2)); | |
687 | goto abort; | |
688 | } | |
689 | ev1 = md_event(sb); | |
690 | ev2 = md_event(refsb); | |
691 | if (ev1 > ev2) | |
692 | ret = 1; | |
693 | else | |
694 | ret = 0; | |
695 | } | |
696 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
697 | ||
2bf071bf N |
698 | if (rdev->size < sb->size && sb->level > 1) |
699 | /* "this cannot possibly happen" ... */ | |
700 | ret = -EINVAL; | |
701 | ||
1da177e4 LT |
702 | abort: |
703 | return ret; | |
704 | } | |
705 | ||
706 | /* | |
707 | * validate_super for 0.90.0 | |
708 | */ | |
709 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
710 | { | |
711 | mdp_disk_t *desc; | |
712 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
713 | ||
41158c7e | 714 | rdev->raid_disk = -1; |
b2d444d7 | 715 | rdev->flags = 0; |
1da177e4 LT |
716 | if (mddev->raid_disks == 0) { |
717 | mddev->major_version = 0; | |
718 | mddev->minor_version = sb->minor_version; | |
719 | mddev->patch_version = sb->patch_version; | |
720 | mddev->persistent = ! sb->not_persistent; | |
721 | mddev->chunk_size = sb->chunk_size; | |
722 | mddev->ctime = sb->ctime; | |
723 | mddev->utime = sb->utime; | |
724 | mddev->level = sb->level; | |
d9d166c2 | 725 | mddev->clevel[0] = 0; |
1da177e4 LT |
726 | mddev->layout = sb->layout; |
727 | mddev->raid_disks = sb->raid_disks; | |
728 | mddev->size = sb->size; | |
729 | mddev->events = md_event(sb); | |
9223214e | 730 | mddev->bitmap_offset = 0; |
36fa3063 | 731 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 LT |
732 | |
733 | if (sb->state & (1<<MD_SB_CLEAN)) | |
734 | mddev->recovery_cp = MaxSector; | |
735 | else { | |
736 | if (sb->events_hi == sb->cp_events_hi && | |
737 | sb->events_lo == sb->cp_events_lo) { | |
738 | mddev->recovery_cp = sb->recovery_cp; | |
739 | } else | |
740 | mddev->recovery_cp = 0; | |
741 | } | |
742 | ||
743 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
744 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
745 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
746 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
747 | ||
748 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
749 | |
750 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
751 | mddev->bitmap_file == NULL) { | |
6cce3b23 N |
752 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 |
753 | && mddev->level != 10) { | |
a654b9d8 | 754 | /* FIXME use a better test */ |
6cce3b23 | 755 | printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); |
a654b9d8 N |
756 | return -EINVAL; |
757 | } | |
36fa3063 | 758 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 N |
759 | } |
760 | ||
41158c7e N |
761 | } else if (mddev->pers == NULL) { |
762 | /* Insist on good event counter while assembling */ | |
763 | __u64 ev1 = md_event(sb); | |
1da177e4 LT |
764 | ++ev1; |
765 | if (ev1 < mddev->events) | |
766 | return -EINVAL; | |
41158c7e N |
767 | } else if (mddev->bitmap) { |
768 | /* if adding to array with a bitmap, then we can accept an | |
769 | * older device ... but not too old. | |
770 | */ | |
771 | __u64 ev1 = md_event(sb); | |
772 | if (ev1 < mddev->bitmap->events_cleared) | |
773 | return 0; | |
774 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
775 | return 0; | |
776 | ||
1da177e4 | 777 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
778 | desc = sb->disks + rdev->desc_nr; |
779 | ||
780 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 781 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
782 | else if (desc->state & (1<<MD_DISK_SYNC) && |
783 | desc->raid_disk < mddev->raid_disks) { | |
b2d444d7 | 784 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
785 | rdev->raid_disk = desc->raid_disk; |
786 | } | |
8ddf9efe N |
787 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
788 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 789 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 790 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
791 | return 0; |
792 | } | |
793 | ||
794 | /* | |
795 | * sync_super for 0.90.0 | |
796 | */ | |
797 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
798 | { | |
799 | mdp_super_t *sb; | |
800 | struct list_head *tmp; | |
801 | mdk_rdev_t *rdev2; | |
802 | int next_spare = mddev->raid_disks; | |
19133a42 | 803 | |
1da177e4 LT |
804 | |
805 | /* make rdev->sb match mddev data.. | |
806 | * | |
807 | * 1/ zero out disks | |
808 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
809 | * 3/ any empty disks < next_spare become removed | |
810 | * | |
811 | * disks[0] gets initialised to REMOVED because | |
812 | * we cannot be sure from other fields if it has | |
813 | * been initialised or not. | |
814 | */ | |
815 | int i; | |
816 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
817 | ||
61181565 N |
818 | rdev->sb_size = MD_SB_BYTES; |
819 | ||
1da177e4 LT |
820 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
821 | ||
822 | memset(sb, 0, sizeof(*sb)); | |
823 | ||
824 | sb->md_magic = MD_SB_MAGIC; | |
825 | sb->major_version = mddev->major_version; | |
826 | sb->minor_version = mddev->minor_version; | |
827 | sb->patch_version = mddev->patch_version; | |
828 | sb->gvalid_words = 0; /* ignored */ | |
829 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
830 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
831 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
832 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
833 | ||
834 | sb->ctime = mddev->ctime; | |
835 | sb->level = mddev->level; | |
836 | sb->size = mddev->size; | |
837 | sb->raid_disks = mddev->raid_disks; | |
838 | sb->md_minor = mddev->md_minor; | |
839 | sb->not_persistent = !mddev->persistent; | |
840 | sb->utime = mddev->utime; | |
841 | sb->state = 0; | |
842 | sb->events_hi = (mddev->events>>32); | |
843 | sb->events_lo = (u32)mddev->events; | |
844 | ||
845 | if (mddev->in_sync) | |
846 | { | |
847 | sb->recovery_cp = mddev->recovery_cp; | |
848 | sb->cp_events_hi = (mddev->events>>32); | |
849 | sb->cp_events_lo = (u32)mddev->events; | |
850 | if (mddev->recovery_cp == MaxSector) | |
851 | sb->state = (1<< MD_SB_CLEAN); | |
852 | } else | |
853 | sb->recovery_cp = 0; | |
854 | ||
855 | sb->layout = mddev->layout; | |
856 | sb->chunk_size = mddev->chunk_size; | |
857 | ||
a654b9d8 N |
858 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
859 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
860 | ||
1da177e4 LT |
861 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
862 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
863 | mdp_disk_t *d; | |
86e6ffdd | 864 | int desc_nr; |
b2d444d7 N |
865 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
866 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 867 | desc_nr = rdev2->raid_disk; |
1da177e4 | 868 | else |
86e6ffdd | 869 | desc_nr = next_spare++; |
19133a42 | 870 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
871 | d = &sb->disks[rdev2->desc_nr]; |
872 | nr_disks++; | |
873 | d->number = rdev2->desc_nr; | |
874 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
875 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
876 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
877 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
878 | d->raid_disk = rdev2->raid_disk; |
879 | else | |
880 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
b2d444d7 | 881 | if (test_bit(Faulty, &rdev2->flags)) { |
1da177e4 LT |
882 | d->state = (1<<MD_DISK_FAULTY); |
883 | failed++; | |
b2d444d7 | 884 | } else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
885 | d->state = (1<<MD_DISK_ACTIVE); |
886 | d->state |= (1<<MD_DISK_SYNC); | |
887 | active++; | |
888 | working++; | |
889 | } else { | |
890 | d->state = 0; | |
891 | spare++; | |
892 | working++; | |
893 | } | |
8ddf9efe N |
894 | if (test_bit(WriteMostly, &rdev2->flags)) |
895 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 896 | } |
1da177e4 LT |
897 | /* now set the "removed" and "faulty" bits on any missing devices */ |
898 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
899 | mdp_disk_t *d = &sb->disks[i]; | |
900 | if (d->state == 0 && d->number == 0) { | |
901 | d->number = i; | |
902 | d->raid_disk = i; | |
903 | d->state = (1<<MD_DISK_REMOVED); | |
904 | d->state |= (1<<MD_DISK_FAULTY); | |
905 | failed++; | |
906 | } | |
907 | } | |
908 | sb->nr_disks = nr_disks; | |
909 | sb->active_disks = active; | |
910 | sb->working_disks = working; | |
911 | sb->failed_disks = failed; | |
912 | sb->spare_disks = spare; | |
913 | ||
914 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
915 | sb->sb_csum = calc_sb_csum(sb); | |
916 | } | |
917 | ||
918 | /* | |
919 | * version 1 superblock | |
920 | */ | |
921 | ||
922 | static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) | |
923 | { | |
924 | unsigned int disk_csum, csum; | |
925 | unsigned long long newcsum; | |
926 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
927 | unsigned int *isuper = (unsigned int*)sb; | |
928 | int i; | |
929 | ||
930 | disk_csum = sb->sb_csum; | |
931 | sb->sb_csum = 0; | |
932 | newcsum = 0; | |
933 | for (i=0; size>=4; size -= 4 ) | |
934 | newcsum += le32_to_cpu(*isuper++); | |
935 | ||
936 | if (size == 2) | |
937 | newcsum += le16_to_cpu(*(unsigned short*) isuper); | |
938 | ||
939 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
940 | sb->sb_csum = disk_csum; | |
941 | return cpu_to_le32(csum); | |
942 | } | |
943 | ||
944 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
945 | { | |
946 | struct mdp_superblock_1 *sb; | |
947 | int ret; | |
948 | sector_t sb_offset; | |
949 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 950 | int bmask; |
1da177e4 LT |
951 | |
952 | /* | |
953 | * Calculate the position of the superblock. | |
954 | * It is always aligned to a 4K boundary and | |
955 | * depeding on minor_version, it can be: | |
956 | * 0: At least 8K, but less than 12K, from end of device | |
957 | * 1: At start of device | |
958 | * 2: 4K from start of device. | |
959 | */ | |
960 | switch(minor_version) { | |
961 | case 0: | |
962 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
963 | sb_offset -= 8*2; | |
39730960 | 964 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
965 | /* convert from sectors to K */ |
966 | sb_offset /= 2; | |
967 | break; | |
968 | case 1: | |
969 | sb_offset = 0; | |
970 | break; | |
971 | case 2: | |
972 | sb_offset = 4; | |
973 | break; | |
974 | default: | |
975 | return -EINVAL; | |
976 | } | |
977 | rdev->sb_offset = sb_offset; | |
978 | ||
0002b271 N |
979 | /* superblock is rarely larger than 1K, but it can be larger, |
980 | * and it is safe to read 4k, so we do that | |
981 | */ | |
982 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
983 | if (ret) return ret; |
984 | ||
985 | ||
986 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
987 | ||
988 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
989 | sb->major_version != cpu_to_le32(1) || | |
990 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
991 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 992 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
993 | return -EINVAL; |
994 | ||
995 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
996 | printk("md: invalid superblock checksum on %s\n", | |
997 | bdevname(rdev->bdev,b)); | |
998 | return -EINVAL; | |
999 | } | |
1000 | if (le64_to_cpu(sb->data_size) < 10) { | |
1001 | printk("md: data_size too small on %s\n", | |
1002 | bdevname(rdev->bdev,b)); | |
1003 | return -EINVAL; | |
1004 | } | |
1005 | rdev->preferred_minor = 0xffff; | |
1006 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1007 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1008 | |
0002b271 | 1009 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1010 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 N |
1011 | if (rdev->sb_size & bmask) |
1012 | rdev-> sb_size = (rdev->sb_size | bmask)+1; | |
1013 | ||
1da177e4 LT |
1014 | if (refdev == 0) |
1015 | return 1; | |
1016 | else { | |
1017 | __u64 ev1, ev2; | |
1018 | struct mdp_superblock_1 *refsb = | |
1019 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1020 | ||
1021 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1022 | sb->level != refsb->level || | |
1023 | sb->layout != refsb->layout || | |
1024 | sb->chunksize != refsb->chunksize) { | |
1025 | printk(KERN_WARNING "md: %s has strangely different" | |
1026 | " superblock to %s\n", | |
1027 | bdevname(rdev->bdev,b), | |
1028 | bdevname(refdev->bdev,b2)); | |
1029 | return -EINVAL; | |
1030 | } | |
1031 | ev1 = le64_to_cpu(sb->events); | |
1032 | ev2 = le64_to_cpu(refsb->events); | |
1033 | ||
1034 | if (ev1 > ev2) | |
1035 | return 1; | |
1036 | } | |
1037 | if (minor_version) | |
1038 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; | |
1039 | else | |
1040 | rdev->size = rdev->sb_offset; | |
1041 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
1042 | return -EINVAL; | |
1043 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1044 | if (le32_to_cpu(sb->chunksize)) | |
1045 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf N |
1046 | |
1047 | if (le32_to_cpu(sb->size) > rdev->size*2) | |
1048 | return -EINVAL; | |
1da177e4 LT |
1049 | return 0; |
1050 | } | |
1051 | ||
1052 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1053 | { | |
1054 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1055 | ||
41158c7e | 1056 | rdev->raid_disk = -1; |
b2d444d7 | 1057 | rdev->flags = 0; |
1da177e4 LT |
1058 | if (mddev->raid_disks == 0) { |
1059 | mddev->major_version = 1; | |
1060 | mddev->patch_version = 0; | |
1061 | mddev->persistent = 1; | |
1062 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; | |
1063 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1064 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1065 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1066 | mddev->clevel[0] = 0; |
1da177e4 LT |
1067 | mddev->layout = le32_to_cpu(sb->layout); |
1068 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1069 | mddev->size = le64_to_cpu(sb->size)/2; | |
1070 | mddev->events = le64_to_cpu(sb->events); | |
9223214e | 1071 | mddev->bitmap_offset = 0; |
53e87fbb | 1072 | mddev->default_bitmap_offset = 1024; |
1da177e4 LT |
1073 | |
1074 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1075 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1076 | ||
1077 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1078 | |
71c0805c | 1079 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
a654b9d8 | 1080 | mddev->bitmap_file == NULL ) { |
6cce3b23 N |
1081 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 |
1082 | && mddev->level != 10) { | |
1083 | printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); | |
a654b9d8 N |
1084 | return -EINVAL; |
1085 | } | |
1086 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); | |
1087 | } | |
41158c7e N |
1088 | } else if (mddev->pers == NULL) { |
1089 | /* Insist of good event counter while assembling */ | |
1090 | __u64 ev1 = le64_to_cpu(sb->events); | |
1da177e4 LT |
1091 | ++ev1; |
1092 | if (ev1 < mddev->events) | |
1093 | return -EINVAL; | |
41158c7e N |
1094 | } else if (mddev->bitmap) { |
1095 | /* If adding to array with a bitmap, then we can accept an | |
1096 | * older device, but not too old. | |
1097 | */ | |
1098 | __u64 ev1 = le64_to_cpu(sb->events); | |
1099 | if (ev1 < mddev->bitmap->events_cleared) | |
1100 | return 0; | |
1101 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1102 | return 0; | |
1da177e4 LT |
1103 | |
1104 | if (mddev->level != LEVEL_MULTIPATH) { | |
1105 | int role; | |
1106 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1107 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1108 | switch(role) { | |
1109 | case 0xffff: /* spare */ | |
1da177e4 LT |
1110 | break; |
1111 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1112 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1113 | break; |
1114 | default: | |
b2d444d7 | 1115 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1116 | rdev->raid_disk = role; |
1117 | break; | |
1118 | } | |
8ddf9efe N |
1119 | if (sb->devflags & WriteMostly1) |
1120 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1121 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1122 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1123 | |
1da177e4 LT |
1124 | return 0; |
1125 | } | |
1126 | ||
1127 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1128 | { | |
1129 | struct mdp_superblock_1 *sb; | |
1130 | struct list_head *tmp; | |
1131 | mdk_rdev_t *rdev2; | |
1132 | int max_dev, i; | |
1133 | /* make rdev->sb match mddev and rdev data. */ | |
1134 | ||
1135 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1136 | ||
1137 | sb->feature_map = 0; | |
1138 | sb->pad0 = 0; | |
1139 | memset(sb->pad1, 0, sizeof(sb->pad1)); | |
1140 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1141 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1142 | ||
1143 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1144 | sb->events = cpu_to_le64(mddev->events); | |
1145 | if (mddev->in_sync) | |
1146 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1147 | else | |
1148 | sb->resync_offset = cpu_to_le64(0); | |
1149 | ||
4dbcdc75 N |
1150 | sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors); |
1151 | ||
a654b9d8 N |
1152 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1153 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1154 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 N |
1155 | } |
1156 | ||
1da177e4 LT |
1157 | max_dev = 0; |
1158 | ITERATE_RDEV(mddev,rdev2,tmp) | |
1159 | if (rdev2->desc_nr+1 > max_dev) | |
1160 | max_dev = rdev2->desc_nr+1; | |
1161 | ||
1162 | sb->max_dev = cpu_to_le32(max_dev); | |
1163 | for (i=0; i<max_dev;i++) | |
1164 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1165 | ||
1166 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
1167 | i = rdev2->desc_nr; | |
b2d444d7 | 1168 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1169 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1170 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 LT |
1171 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1172 | else | |
1173 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1174 | } | |
1175 | ||
1176 | sb->recovery_offset = cpu_to_le64(0); /* not supported yet */ | |
1177 | sb->sb_csum = calc_sb_1_csum(sb); | |
1178 | } | |
1179 | ||
1180 | ||
75c96f85 | 1181 | static struct super_type super_types[] = { |
1da177e4 LT |
1182 | [0] = { |
1183 | .name = "0.90.0", | |
1184 | .owner = THIS_MODULE, | |
1185 | .load_super = super_90_load, | |
1186 | .validate_super = super_90_validate, | |
1187 | .sync_super = super_90_sync, | |
1188 | }, | |
1189 | [1] = { | |
1190 | .name = "md-1", | |
1191 | .owner = THIS_MODULE, | |
1192 | .load_super = super_1_load, | |
1193 | .validate_super = super_1_validate, | |
1194 | .sync_super = super_1_sync, | |
1195 | }, | |
1196 | }; | |
1197 | ||
1198 | static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) | |
1199 | { | |
1200 | struct list_head *tmp; | |
1201 | mdk_rdev_t *rdev; | |
1202 | ||
1203 | ITERATE_RDEV(mddev,rdev,tmp) | |
1204 | if (rdev->bdev->bd_contains == dev->bdev->bd_contains) | |
1205 | return rdev; | |
1206 | ||
1207 | return NULL; | |
1208 | } | |
1209 | ||
1210 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1211 | { | |
1212 | struct list_head *tmp; | |
1213 | mdk_rdev_t *rdev; | |
1214 | ||
1215 | ITERATE_RDEV(mddev1,rdev,tmp) | |
1216 | if (match_dev_unit(mddev2, rdev)) | |
1217 | return 1; | |
1218 | ||
1219 | return 0; | |
1220 | } | |
1221 | ||
1222 | static LIST_HEAD(pending_raid_disks); | |
1223 | ||
1224 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1225 | { | |
1226 | mdk_rdev_t *same_pdev; | |
1227 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
f637b9f9 | 1228 | struct kobject *ko; |
1da177e4 LT |
1229 | |
1230 | if (rdev->mddev) { | |
1231 | MD_BUG(); | |
1232 | return -EINVAL; | |
1233 | } | |
2bf071bf N |
1234 | /* make sure rdev->size exceeds mddev->size */ |
1235 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
1236 | if (mddev->pers) | |
1237 | /* Cannot change size, so fail */ | |
1238 | return -ENOSPC; | |
1239 | else | |
1240 | mddev->size = rdev->size; | |
1241 | } | |
1da177e4 LT |
1242 | same_pdev = match_dev_unit(mddev, rdev); |
1243 | if (same_pdev) | |
1244 | printk(KERN_WARNING | |
1245 | "%s: WARNING: %s appears to be on the same physical" | |
1246 | " disk as %s. True\n protection against single-disk" | |
1247 | " failure might be compromised.\n", | |
1248 | mdname(mddev), bdevname(rdev->bdev,b), | |
1249 | bdevname(same_pdev->bdev,b2)); | |
1250 | ||
1251 | /* Verify rdev->desc_nr is unique. | |
1252 | * If it is -1, assign a free number, else | |
1253 | * check number is not in use | |
1254 | */ | |
1255 | if (rdev->desc_nr < 0) { | |
1256 | int choice = 0; | |
1257 | if (mddev->pers) choice = mddev->raid_disks; | |
1258 | while (find_rdev_nr(mddev, choice)) | |
1259 | choice++; | |
1260 | rdev->desc_nr = choice; | |
1261 | } else { | |
1262 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1263 | return -EBUSY; | |
1264 | } | |
19133a42 N |
1265 | bdevname(rdev->bdev,b); |
1266 | if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) | |
1267 | return -ENOMEM; | |
1da177e4 LT |
1268 | |
1269 | list_add(&rdev->same_set, &mddev->disks); | |
1270 | rdev->mddev = mddev; | |
19133a42 | 1271 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1272 | |
9c791977 | 1273 | rdev->kobj.parent = &mddev->kobj; |
86e6ffdd N |
1274 | kobject_add(&rdev->kobj); |
1275 | ||
f637b9f9 N |
1276 | if (rdev->bdev->bd_part) |
1277 | ko = &rdev->bdev->bd_part->kobj; | |
1278 | else | |
1279 | ko = &rdev->bdev->bd_disk->kobj; | |
1280 | sysfs_create_link(&rdev->kobj, ko, "block"); | |
1da177e4 LT |
1281 | return 0; |
1282 | } | |
1283 | ||
1284 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) | |
1285 | { | |
1286 | char b[BDEVNAME_SIZE]; | |
1287 | if (!rdev->mddev) { | |
1288 | MD_BUG(); | |
1289 | return; | |
1290 | } | |
1291 | list_del_init(&rdev->same_set); | |
1292 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1293 | rdev->mddev = NULL; | |
86e6ffdd N |
1294 | sysfs_remove_link(&rdev->kobj, "block"); |
1295 | kobject_del(&rdev->kobj); | |
1da177e4 LT |
1296 | } |
1297 | ||
1298 | /* | |
1299 | * prevent the device from being mounted, repartitioned or | |
1300 | * otherwise reused by a RAID array (or any other kernel | |
1301 | * subsystem), by bd_claiming the device. | |
1302 | */ | |
1303 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) | |
1304 | { | |
1305 | int err = 0; | |
1306 | struct block_device *bdev; | |
1307 | char b[BDEVNAME_SIZE]; | |
1308 | ||
1309 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
1310 | if (IS_ERR(bdev)) { | |
1311 | printk(KERN_ERR "md: could not open %s.\n", | |
1312 | __bdevname(dev, b)); | |
1313 | return PTR_ERR(bdev); | |
1314 | } | |
1315 | err = bd_claim(bdev, rdev); | |
1316 | if (err) { | |
1317 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1318 | bdevname(bdev, b)); | |
1319 | blkdev_put(bdev); | |
1320 | return err; | |
1321 | } | |
1322 | rdev->bdev = bdev; | |
1323 | return err; | |
1324 | } | |
1325 | ||
1326 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1327 | { | |
1328 | struct block_device *bdev = rdev->bdev; | |
1329 | rdev->bdev = NULL; | |
1330 | if (!bdev) | |
1331 | MD_BUG(); | |
1332 | bd_release(bdev); | |
1333 | blkdev_put(bdev); | |
1334 | } | |
1335 | ||
1336 | void md_autodetect_dev(dev_t dev); | |
1337 | ||
1338 | static void export_rdev(mdk_rdev_t * rdev) | |
1339 | { | |
1340 | char b[BDEVNAME_SIZE]; | |
1341 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1342 | bdevname(rdev->bdev,b)); | |
1343 | if (rdev->mddev) | |
1344 | MD_BUG(); | |
1345 | free_disk_sb(rdev); | |
1346 | list_del_init(&rdev->same_set); | |
1347 | #ifndef MODULE | |
1348 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1349 | #endif | |
1350 | unlock_rdev(rdev); | |
86e6ffdd | 1351 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1352 | } |
1353 | ||
1354 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1355 | { | |
1356 | unbind_rdev_from_array(rdev); | |
1357 | export_rdev(rdev); | |
1358 | } | |
1359 | ||
1360 | static void export_array(mddev_t *mddev) | |
1361 | { | |
1362 | struct list_head *tmp; | |
1363 | mdk_rdev_t *rdev; | |
1364 | ||
1365 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1366 | if (!rdev->mddev) { | |
1367 | MD_BUG(); | |
1368 | continue; | |
1369 | } | |
1370 | kick_rdev_from_array(rdev); | |
1371 | } | |
1372 | if (!list_empty(&mddev->disks)) | |
1373 | MD_BUG(); | |
1374 | mddev->raid_disks = 0; | |
1375 | mddev->major_version = 0; | |
1376 | } | |
1377 | ||
1378 | static void print_desc(mdp_disk_t *desc) | |
1379 | { | |
1380 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1381 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1382 | } | |
1383 | ||
1384 | static void print_sb(mdp_super_t *sb) | |
1385 | { | |
1386 | int i; | |
1387 | ||
1388 | printk(KERN_INFO | |
1389 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1390 | sb->major_version, sb->minor_version, sb->patch_version, | |
1391 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1392 | sb->ctime); | |
1393 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1394 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1395 | sb->md_minor, sb->layout, sb->chunk_size); | |
1396 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1397 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1398 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1399 | sb->failed_disks, sb->spare_disks, | |
1400 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1401 | ||
1402 | printk(KERN_INFO); | |
1403 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1404 | mdp_disk_t *desc; | |
1405 | ||
1406 | desc = sb->disks + i; | |
1407 | if (desc->number || desc->major || desc->minor || | |
1408 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1409 | printk(" D %2d: ", i); | |
1410 | print_desc(desc); | |
1411 | } | |
1412 | } | |
1413 | printk(KERN_INFO "md: THIS: "); | |
1414 | print_desc(&sb->this_disk); | |
1415 | ||
1416 | } | |
1417 | ||
1418 | static void print_rdev(mdk_rdev_t *rdev) | |
1419 | { | |
1420 | char b[BDEVNAME_SIZE]; | |
1421 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1422 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1423 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1424 | rdev->desc_nr); | |
1da177e4 LT |
1425 | if (rdev->sb_loaded) { |
1426 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1427 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1428 | } else | |
1429 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1430 | } | |
1431 | ||
1432 | void md_print_devices(void) | |
1433 | { | |
1434 | struct list_head *tmp, *tmp2; | |
1435 | mdk_rdev_t *rdev; | |
1436 | mddev_t *mddev; | |
1437 | char b[BDEVNAME_SIZE]; | |
1438 | ||
1439 | printk("\n"); | |
1440 | printk("md: **********************************\n"); | |
1441 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1442 | printk("md: **********************************\n"); | |
1443 | ITERATE_MDDEV(mddev,tmp) { | |
1da177e4 | 1444 | |
32a7627c N |
1445 | if (mddev->bitmap) |
1446 | bitmap_print_sb(mddev->bitmap); | |
1447 | else | |
1448 | printk("%s: ", mdname(mddev)); | |
1da177e4 LT |
1449 | ITERATE_RDEV(mddev,rdev,tmp2) |
1450 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1451 | printk("\n"); | |
1452 | ||
1453 | ITERATE_RDEV(mddev,rdev,tmp2) | |
1454 | print_rdev(rdev); | |
1455 | } | |
1456 | printk("md: **********************************\n"); | |
1457 | printk("\n"); | |
1458 | } | |
1459 | ||
1460 | ||
1da177e4 LT |
1461 | static void sync_sbs(mddev_t * mddev) |
1462 | { | |
1463 | mdk_rdev_t *rdev; | |
1464 | struct list_head *tmp; | |
1465 | ||
1466 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1467 | super_types[mddev->major_version]. | |
1468 | sync_super(mddev, rdev); | |
1469 | rdev->sb_loaded = 1; | |
1470 | } | |
1471 | } | |
1472 | ||
1473 | static void md_update_sb(mddev_t * mddev) | |
1474 | { | |
7bfa19f2 | 1475 | int err; |
1da177e4 LT |
1476 | struct list_head *tmp; |
1477 | mdk_rdev_t *rdev; | |
06d91a5f | 1478 | int sync_req; |
1da177e4 | 1479 | |
1da177e4 | 1480 | repeat: |
a9701a30 | 1481 | spin_lock_irq(&mddev->write_lock); |
06d91a5f | 1482 | sync_req = mddev->in_sync; |
1da177e4 LT |
1483 | mddev->utime = get_seconds(); |
1484 | mddev->events ++; | |
1485 | ||
1486 | if (!mddev->events) { | |
1487 | /* | |
1488 | * oops, this 64-bit counter should never wrap. | |
1489 | * Either we are in around ~1 trillion A.C., assuming | |
1490 | * 1 reboot per second, or we have a bug: | |
1491 | */ | |
1492 | MD_BUG(); | |
1493 | mddev->events --; | |
1494 | } | |
7bfa19f2 | 1495 | mddev->sb_dirty = 2; |
1da177e4 LT |
1496 | sync_sbs(mddev); |
1497 | ||
1498 | /* | |
1499 | * do not write anything to disk if using | |
1500 | * nonpersistent superblocks | |
1501 | */ | |
06d91a5f N |
1502 | if (!mddev->persistent) { |
1503 | mddev->sb_dirty = 0; | |
a9701a30 | 1504 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1505 | wake_up(&mddev->sb_wait); |
1da177e4 | 1506 | return; |
06d91a5f | 1507 | } |
a9701a30 | 1508 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1509 | |
1510 | dprintk(KERN_INFO | |
1511 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1512 | mdname(mddev),mddev->in_sync); | |
1513 | ||
32a7627c | 1514 | err = bitmap_update_sb(mddev->bitmap); |
1da177e4 LT |
1515 | ITERATE_RDEV(mddev,rdev,tmp) { |
1516 | char b[BDEVNAME_SIZE]; | |
1517 | dprintk(KERN_INFO "md: "); | |
b2d444d7 | 1518 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1519 | dprintk("(skipping faulty "); |
1520 | ||
1521 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1522 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1523 | md_super_write(mddev,rdev, |
0002b271 | 1524 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1525 | rdev->sb_page); |
1526 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1527 | bdevname(rdev->bdev,b), | |
1528 | (unsigned long long)rdev->sb_offset); | |
1529 | ||
1da177e4 LT |
1530 | } else |
1531 | dprintk(")\n"); | |
7bfa19f2 | 1532 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1533 | /* only need to write one superblock... */ |
1534 | break; | |
1535 | } | |
a9701a30 | 1536 | md_super_wait(mddev); |
7bfa19f2 N |
1537 | /* if there was a failure, sb_dirty was set to 1, and we re-write super */ |
1538 | ||
a9701a30 | 1539 | spin_lock_irq(&mddev->write_lock); |
7bfa19f2 | 1540 | if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { |
06d91a5f | 1541 | /* have to write it out again */ |
a9701a30 | 1542 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1543 | goto repeat; |
1544 | } | |
1545 | mddev->sb_dirty = 0; | |
a9701a30 | 1546 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1547 | wake_up(&mddev->sb_wait); |
06d91a5f | 1548 | |
1da177e4 LT |
1549 | } |
1550 | ||
bce74dac N |
1551 | /* words written to sysfs files may, or my not, be \n terminated. |
1552 | * We want to accept with case. For this we use cmd_match. | |
1553 | */ | |
1554 | static int cmd_match(const char *cmd, const char *str) | |
1555 | { | |
1556 | /* See if cmd, written into a sysfs file, matches | |
1557 | * str. They must either be the same, or cmd can | |
1558 | * have a trailing newline | |
1559 | */ | |
1560 | while (*cmd && *str && *cmd == *str) { | |
1561 | cmd++; | |
1562 | str++; | |
1563 | } | |
1564 | if (*cmd == '\n') | |
1565 | cmd++; | |
1566 | if (*str || *cmd) | |
1567 | return 0; | |
1568 | return 1; | |
1569 | } | |
1570 | ||
86e6ffdd N |
1571 | struct rdev_sysfs_entry { |
1572 | struct attribute attr; | |
1573 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1574 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1575 | }; | |
1576 | ||
1577 | static ssize_t | |
96de1e66 | 1578 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1579 | { |
1580 | char *sep = ""; | |
1581 | int len=0; | |
1582 | ||
b2d444d7 | 1583 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1584 | len+= sprintf(page+len, "%sfaulty",sep); |
1585 | sep = ","; | |
1586 | } | |
b2d444d7 | 1587 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1588 | len += sprintf(page+len, "%sin_sync",sep); |
1589 | sep = ","; | |
1590 | } | |
b2d444d7 N |
1591 | if (!test_bit(Faulty, &rdev->flags) && |
1592 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1593 | len += sprintf(page+len, "%sspare", sep); |
1594 | sep = ","; | |
1595 | } | |
1596 | return len+sprintf(page+len, "\n"); | |
1597 | } | |
1598 | ||
96de1e66 N |
1599 | static struct rdev_sysfs_entry |
1600 | rdev_state = __ATTR_RO(state); | |
86e6ffdd N |
1601 | |
1602 | static ssize_t | |
96de1e66 | 1603 | super_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1604 | { |
1605 | if (rdev->sb_loaded && rdev->sb_size) { | |
1606 | memcpy(page, page_address(rdev->sb_page), rdev->sb_size); | |
1607 | return rdev->sb_size; | |
1608 | } else | |
1609 | return 0; | |
1610 | } | |
96de1e66 N |
1611 | static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); |
1612 | ||
4dbcdc75 N |
1613 | static ssize_t |
1614 | errors_show(mdk_rdev_t *rdev, char *page) | |
1615 | { | |
1616 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1617 | } | |
1618 | ||
1619 | static ssize_t | |
1620 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1621 | { | |
1622 | char *e; | |
1623 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1624 | if (*buf && (*e == 0 || *e == '\n')) { | |
1625 | atomic_set(&rdev->corrected_errors, n); | |
1626 | return len; | |
1627 | } | |
1628 | return -EINVAL; | |
1629 | } | |
1630 | static struct rdev_sysfs_entry rdev_errors = | |
1631 | __ATTR(errors, 0644, errors_show, errors_store); | |
1632 | ||
86e6ffdd N |
1633 | static struct attribute *rdev_default_attrs[] = { |
1634 | &rdev_state.attr, | |
1635 | &rdev_super.attr, | |
4dbcdc75 | 1636 | &rdev_errors.attr, |
86e6ffdd N |
1637 | NULL, |
1638 | }; | |
1639 | static ssize_t | |
1640 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1641 | { | |
1642 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1643 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1644 | ||
1645 | if (!entry->show) | |
1646 | return -EIO; | |
1647 | return entry->show(rdev, page); | |
1648 | } | |
1649 | ||
1650 | static ssize_t | |
1651 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
1652 | const char *page, size_t length) | |
1653 | { | |
1654 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1655 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1656 | ||
1657 | if (!entry->store) | |
1658 | return -EIO; | |
1659 | return entry->store(rdev, page, length); | |
1660 | } | |
1661 | ||
1662 | static void rdev_free(struct kobject *ko) | |
1663 | { | |
1664 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
1665 | kfree(rdev); | |
1666 | } | |
1667 | static struct sysfs_ops rdev_sysfs_ops = { | |
1668 | .show = rdev_attr_show, | |
1669 | .store = rdev_attr_store, | |
1670 | }; | |
1671 | static struct kobj_type rdev_ktype = { | |
1672 | .release = rdev_free, | |
1673 | .sysfs_ops = &rdev_sysfs_ops, | |
1674 | .default_attrs = rdev_default_attrs, | |
1675 | }; | |
1676 | ||
1da177e4 LT |
1677 | /* |
1678 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
1679 | * | |
1680 | * mark the device faulty if: | |
1681 | * | |
1682 | * - the device is nonexistent (zero size) | |
1683 | * - the device has no valid superblock | |
1684 | * | |
1685 | * a faulty rdev _never_ has rdev->sb set. | |
1686 | */ | |
1687 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
1688 | { | |
1689 | char b[BDEVNAME_SIZE]; | |
1690 | int err; | |
1691 | mdk_rdev_t *rdev; | |
1692 | sector_t size; | |
1693 | ||
9ffae0cf | 1694 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
1695 | if (!rdev) { |
1696 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
1697 | return ERR_PTR(-ENOMEM); | |
1698 | } | |
1da177e4 LT |
1699 | |
1700 | if ((err = alloc_disk_sb(rdev))) | |
1701 | goto abort_free; | |
1702 | ||
1703 | err = lock_rdev(rdev, newdev); | |
1704 | if (err) | |
1705 | goto abort_free; | |
1706 | ||
86e6ffdd N |
1707 | rdev->kobj.parent = NULL; |
1708 | rdev->kobj.ktype = &rdev_ktype; | |
1709 | kobject_init(&rdev->kobj); | |
1710 | ||
1da177e4 | 1711 | rdev->desc_nr = -1; |
b2d444d7 | 1712 | rdev->flags = 0; |
1da177e4 LT |
1713 | rdev->data_offset = 0; |
1714 | atomic_set(&rdev->nr_pending, 0); | |
ba22dcbf | 1715 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 1716 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
1717 | |
1718 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
1719 | if (!size) { | |
1720 | printk(KERN_WARNING | |
1721 | "md: %s has zero or unknown size, marking faulty!\n", | |
1722 | bdevname(rdev->bdev,b)); | |
1723 | err = -EINVAL; | |
1724 | goto abort_free; | |
1725 | } | |
1726 | ||
1727 | if (super_format >= 0) { | |
1728 | err = super_types[super_format]. | |
1729 | load_super(rdev, NULL, super_minor); | |
1730 | if (err == -EINVAL) { | |
1731 | printk(KERN_WARNING | |
1732 | "md: %s has invalid sb, not importing!\n", | |
1733 | bdevname(rdev->bdev,b)); | |
1734 | goto abort_free; | |
1735 | } | |
1736 | if (err < 0) { | |
1737 | printk(KERN_WARNING | |
1738 | "md: could not read %s's sb, not importing!\n", | |
1739 | bdevname(rdev->bdev,b)); | |
1740 | goto abort_free; | |
1741 | } | |
1742 | } | |
1743 | INIT_LIST_HEAD(&rdev->same_set); | |
1744 | ||
1745 | return rdev; | |
1746 | ||
1747 | abort_free: | |
1748 | if (rdev->sb_page) { | |
1749 | if (rdev->bdev) | |
1750 | unlock_rdev(rdev); | |
1751 | free_disk_sb(rdev); | |
1752 | } | |
1753 | kfree(rdev); | |
1754 | return ERR_PTR(err); | |
1755 | } | |
1756 | ||
1757 | /* | |
1758 | * Check a full RAID array for plausibility | |
1759 | */ | |
1760 | ||
1761 | ||
a757e64c | 1762 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
1763 | { |
1764 | int i; | |
1765 | struct list_head *tmp; | |
1766 | mdk_rdev_t *rdev, *freshest; | |
1767 | char b[BDEVNAME_SIZE]; | |
1768 | ||
1769 | freshest = NULL; | |
1770 | ITERATE_RDEV(mddev,rdev,tmp) | |
1771 | switch (super_types[mddev->major_version]. | |
1772 | load_super(rdev, freshest, mddev->minor_version)) { | |
1773 | case 1: | |
1774 | freshest = rdev; | |
1775 | break; | |
1776 | case 0: | |
1777 | break; | |
1778 | default: | |
1779 | printk( KERN_ERR \ | |
1780 | "md: fatal superblock inconsistency in %s" | |
1781 | " -- removing from array\n", | |
1782 | bdevname(rdev->bdev,b)); | |
1783 | kick_rdev_from_array(rdev); | |
1784 | } | |
1785 | ||
1786 | ||
1787 | super_types[mddev->major_version]. | |
1788 | validate_super(mddev, freshest); | |
1789 | ||
1790 | i = 0; | |
1791 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1792 | if (rdev != freshest) | |
1793 | if (super_types[mddev->major_version]. | |
1794 | validate_super(mddev, rdev)) { | |
1795 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
1796 | " from array!\n", | |
1797 | bdevname(rdev->bdev,b)); | |
1798 | kick_rdev_from_array(rdev); | |
1799 | continue; | |
1800 | } | |
1801 | if (mddev->level == LEVEL_MULTIPATH) { | |
1802 | rdev->desc_nr = i++; | |
1803 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 1804 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1805 | } |
1806 | } | |
1807 | ||
1808 | ||
1809 | ||
1810 | if (mddev->recovery_cp != MaxSector && | |
1811 | mddev->level >= 1) | |
1812 | printk(KERN_ERR "md: %s: raid array is not clean" | |
1813 | " -- starting background reconstruction\n", | |
1814 | mdname(mddev)); | |
1815 | ||
1da177e4 LT |
1816 | } |
1817 | ||
eae1701f | 1818 | static ssize_t |
96de1e66 | 1819 | level_show(mddev_t *mddev, char *page) |
eae1701f | 1820 | { |
2604b703 | 1821 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 1822 | if (p) |
eae1701f | 1823 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
1824 | else if (mddev->clevel[0]) |
1825 | return sprintf(page, "%s\n", mddev->clevel); | |
1826 | else if (mddev->level != LEVEL_NONE) | |
1827 | return sprintf(page, "%d\n", mddev->level); | |
1828 | else | |
1829 | return 0; | |
eae1701f N |
1830 | } |
1831 | ||
d9d166c2 N |
1832 | static ssize_t |
1833 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
1834 | { | |
1835 | int rv = len; | |
1836 | if (mddev->pers) | |
1837 | return -EBUSY; | |
1838 | if (len == 0) | |
1839 | return 0; | |
1840 | if (len >= sizeof(mddev->clevel)) | |
1841 | return -ENOSPC; | |
1842 | strncpy(mddev->clevel, buf, len); | |
1843 | if (mddev->clevel[len-1] == '\n') | |
1844 | len--; | |
1845 | mddev->clevel[len] = 0; | |
1846 | mddev->level = LEVEL_NONE; | |
1847 | return rv; | |
1848 | } | |
1849 | ||
1850 | static struct md_sysfs_entry md_level = | |
1851 | __ATTR(level, 0644, level_show, level_store); | |
eae1701f N |
1852 | |
1853 | static ssize_t | |
96de1e66 | 1854 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 1855 | { |
bb636547 N |
1856 | if (mddev->raid_disks == 0) |
1857 | return 0; | |
eae1701f N |
1858 | return sprintf(page, "%d\n", mddev->raid_disks); |
1859 | } | |
1860 | ||
da943b99 N |
1861 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
1862 | ||
1863 | static ssize_t | |
1864 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
1865 | { | |
1866 | /* can only set raid_disks if array is not yet active */ | |
1867 | char *e; | |
1868 | int rv = 0; | |
1869 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1870 | ||
1871 | if (!*buf || (*e && *e != '\n')) | |
1872 | return -EINVAL; | |
1873 | ||
1874 | if (mddev->pers) | |
1875 | rv = update_raid_disks(mddev, n); | |
1876 | else | |
1877 | mddev->raid_disks = n; | |
1878 | return rv ? rv : len; | |
1879 | } | |
1880 | static struct md_sysfs_entry md_raid_disks = | |
1881 | __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store); | |
eae1701f | 1882 | |
3b34380a N |
1883 | static ssize_t |
1884 | chunk_size_show(mddev_t *mddev, char *page) | |
1885 | { | |
1886 | return sprintf(page, "%d\n", mddev->chunk_size); | |
1887 | } | |
1888 | ||
1889 | static ssize_t | |
1890 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
1891 | { | |
1892 | /* can only set chunk_size if array is not yet active */ | |
1893 | char *e; | |
1894 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1895 | ||
1896 | if (mddev->pers) | |
1897 | return -EBUSY; | |
1898 | if (!*buf || (*e && *e != '\n')) | |
1899 | return -EINVAL; | |
1900 | ||
1901 | mddev->chunk_size = n; | |
1902 | return len; | |
1903 | } | |
1904 | static struct md_sysfs_entry md_chunk_size = | |
1905 | __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store); | |
1906 | ||
1907 | ||
a35b0d69 N |
1908 | static ssize_t |
1909 | size_show(mddev_t *mddev, char *page) | |
1910 | { | |
1911 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
1912 | } | |
1913 | ||
1914 | static int update_size(mddev_t *mddev, unsigned long size); | |
1915 | ||
1916 | static ssize_t | |
1917 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
1918 | { | |
1919 | /* If array is inactive, we can reduce the component size, but | |
1920 | * not increase it (except from 0). | |
1921 | * If array is active, we can try an on-line resize | |
1922 | */ | |
1923 | char *e; | |
1924 | int err = 0; | |
1925 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
1926 | if (!*buf || *buf == '\n' || | |
1927 | (*e && *e != '\n')) | |
1928 | return -EINVAL; | |
1929 | ||
1930 | if (mddev->pers) { | |
1931 | err = update_size(mddev, size); | |
1932 | md_update_sb(mddev); | |
1933 | } else { | |
1934 | if (mddev->size == 0 || | |
1935 | mddev->size > size) | |
1936 | mddev->size = size; | |
1937 | else | |
1938 | err = -ENOSPC; | |
1939 | } | |
1940 | return err ? err : len; | |
1941 | } | |
1942 | ||
1943 | static struct md_sysfs_entry md_size = | |
1944 | __ATTR(component_size, 0644, size_show, size_store); | |
1945 | ||
8bb93aac N |
1946 | |
1947 | /* Metdata version. | |
1948 | * This is either 'none' for arrays with externally managed metadata, | |
1949 | * or N.M for internally known formats | |
1950 | */ | |
1951 | static ssize_t | |
1952 | metadata_show(mddev_t *mddev, char *page) | |
1953 | { | |
1954 | if (mddev->persistent) | |
1955 | return sprintf(page, "%d.%d\n", | |
1956 | mddev->major_version, mddev->minor_version); | |
1957 | else | |
1958 | return sprintf(page, "none\n"); | |
1959 | } | |
1960 | ||
1961 | static ssize_t | |
1962 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
1963 | { | |
1964 | int major, minor; | |
1965 | char *e; | |
1966 | if (!list_empty(&mddev->disks)) | |
1967 | return -EBUSY; | |
1968 | ||
1969 | if (cmd_match(buf, "none")) { | |
1970 | mddev->persistent = 0; | |
1971 | mddev->major_version = 0; | |
1972 | mddev->minor_version = 90; | |
1973 | return len; | |
1974 | } | |
1975 | major = simple_strtoul(buf, &e, 10); | |
1976 | if (e==buf || *e != '.') | |
1977 | return -EINVAL; | |
1978 | buf = e+1; | |
1979 | minor = simple_strtoul(buf, &e, 10); | |
1980 | if (e==buf || *e != '\n') | |
1981 | return -EINVAL; | |
1982 | if (major >= sizeof(super_types)/sizeof(super_types[0]) || | |
1983 | super_types[major].name == NULL) | |
1984 | return -ENOENT; | |
1985 | mddev->major_version = major; | |
1986 | mddev->minor_version = minor; | |
1987 | mddev->persistent = 1; | |
1988 | return len; | |
1989 | } | |
1990 | ||
1991 | static struct md_sysfs_entry md_metadata = | |
1992 | __ATTR(metadata_version, 0644, metadata_show, metadata_store); | |
1993 | ||
24dd469d | 1994 | static ssize_t |
7eec314d | 1995 | action_show(mddev_t *mddev, char *page) |
24dd469d | 1996 | { |
7eec314d | 1997 | char *type = "idle"; |
31399d9e N |
1998 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
1999 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { | |
2000 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
2001 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
2002 | type = "resync"; | |
2003 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
2004 | type = "check"; | |
2005 | else | |
2006 | type = "repair"; | |
2007 | } else | |
2008 | type = "recover"; | |
2009 | } | |
2010 | return sprintf(page, "%s\n", type); | |
2011 | } | |
2012 | ||
2013 | static ssize_t | |
7eec314d | 2014 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 2015 | { |
7eec314d N |
2016 | if (!mddev->pers || !mddev->pers->sync_request) |
2017 | return -EINVAL; | |
2018 | ||
bce74dac | 2019 | if (cmd_match(page, "idle")) { |
7eec314d N |
2020 | if (mddev->sync_thread) { |
2021 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2022 | md_unregister_thread(mddev->sync_thread); | |
2023 | mddev->sync_thread = NULL; | |
2024 | mddev->recovery = 0; | |
2025 | } | |
03c902e1 N |
2026 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2027 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 2028 | return -EBUSY; |
03c902e1 | 2029 | else if (cmd_match(page, "resync") || cmd_match(page, "recover")) |
7eec314d N |
2030 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2031 | else { | |
bce74dac | 2032 | if (cmd_match(page, "check")) |
7eec314d | 2033 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
bce74dac | 2034 | else if (cmd_match(page, "repair")) |
7eec314d N |
2035 | return -EINVAL; |
2036 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
2037 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 2038 | } |
03c902e1 | 2039 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d N |
2040 | md_wakeup_thread(mddev->thread); |
2041 | return len; | |
2042 | } | |
2043 | ||
9d88883e | 2044 | static ssize_t |
96de1e66 | 2045 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
2046 | { |
2047 | return sprintf(page, "%llu\n", | |
2048 | (unsigned long long) mddev->resync_mismatches); | |
2049 | } | |
2050 | ||
96de1e66 | 2051 | static struct md_sysfs_entry |
7eec314d | 2052 | md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
24dd469d | 2053 | |
96de1e66 N |
2054 | |
2055 | static struct md_sysfs_entry | |
2056 | md_mismatches = __ATTR_RO(mismatch_cnt); | |
9d88883e | 2057 | |
eae1701f N |
2058 | static struct attribute *md_default_attrs[] = { |
2059 | &md_level.attr, | |
2060 | &md_raid_disks.attr, | |
3b34380a | 2061 | &md_chunk_size.attr, |
a35b0d69 | 2062 | &md_size.attr, |
8bb93aac | 2063 | &md_metadata.attr, |
411036fa N |
2064 | NULL, |
2065 | }; | |
2066 | ||
2067 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 2068 | &md_scan_mode.attr, |
9d88883e | 2069 | &md_mismatches.attr, |
eae1701f N |
2070 | NULL, |
2071 | }; | |
411036fa N |
2072 | static struct attribute_group md_redundancy_group = { |
2073 | .name = NULL, | |
2074 | .attrs = md_redundancy_attrs, | |
2075 | }; | |
2076 | ||
eae1701f N |
2077 | |
2078 | static ssize_t | |
2079 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2080 | { | |
2081 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
2082 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 2083 | ssize_t rv; |
eae1701f N |
2084 | |
2085 | if (!entry->show) | |
2086 | return -EIO; | |
96de1e66 N |
2087 | mddev_lock(mddev); |
2088 | rv = entry->show(mddev, page); | |
2089 | mddev_unlock(mddev); | |
2090 | return rv; | |
eae1701f N |
2091 | } |
2092 | ||
2093 | static ssize_t | |
2094 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
2095 | const char *page, size_t length) | |
2096 | { | |
2097 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
2098 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 2099 | ssize_t rv; |
eae1701f N |
2100 | |
2101 | if (!entry->store) | |
2102 | return -EIO; | |
96de1e66 N |
2103 | mddev_lock(mddev); |
2104 | rv = entry->store(mddev, page, length); | |
2105 | mddev_unlock(mddev); | |
2106 | return rv; | |
eae1701f N |
2107 | } |
2108 | ||
2109 | static void md_free(struct kobject *ko) | |
2110 | { | |
2111 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
2112 | kfree(mddev); | |
2113 | } | |
2114 | ||
2115 | static struct sysfs_ops md_sysfs_ops = { | |
2116 | .show = md_attr_show, | |
2117 | .store = md_attr_store, | |
2118 | }; | |
2119 | static struct kobj_type md_ktype = { | |
2120 | .release = md_free, | |
2121 | .sysfs_ops = &md_sysfs_ops, | |
2122 | .default_attrs = md_default_attrs, | |
2123 | }; | |
2124 | ||
1da177e4 LT |
2125 | int mdp_major = 0; |
2126 | ||
2127 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
2128 | { | |
2129 | static DECLARE_MUTEX(disks_sem); | |
2130 | mddev_t *mddev = mddev_find(dev); | |
2131 | struct gendisk *disk; | |
2132 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
2133 | int shift = partitioned ? MdpMinorShift : 0; | |
2134 | int unit = MINOR(dev) >> shift; | |
2135 | ||
2136 | if (!mddev) | |
2137 | return NULL; | |
2138 | ||
2139 | down(&disks_sem); | |
2140 | if (mddev->gendisk) { | |
2141 | up(&disks_sem); | |
2142 | mddev_put(mddev); | |
2143 | return NULL; | |
2144 | } | |
2145 | disk = alloc_disk(1 << shift); | |
2146 | if (!disk) { | |
2147 | up(&disks_sem); | |
2148 | mddev_put(mddev); | |
2149 | return NULL; | |
2150 | } | |
2151 | disk->major = MAJOR(dev); | |
2152 | disk->first_minor = unit << shift; | |
2153 | if (partitioned) { | |
2154 | sprintf(disk->disk_name, "md_d%d", unit); | |
2155 | sprintf(disk->devfs_name, "md/d%d", unit); | |
2156 | } else { | |
2157 | sprintf(disk->disk_name, "md%d", unit); | |
2158 | sprintf(disk->devfs_name, "md/%d", unit); | |
2159 | } | |
2160 | disk->fops = &md_fops; | |
2161 | disk->private_data = mddev; | |
2162 | disk->queue = mddev->queue; | |
2163 | add_disk(disk); | |
2164 | mddev->gendisk = disk; | |
2165 | up(&disks_sem); | |
9c791977 | 2166 | mddev->kobj.parent = &disk->kobj; |
eae1701f N |
2167 | mddev->kobj.k_name = NULL; |
2168 | snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); | |
2169 | mddev->kobj.ktype = &md_ktype; | |
2170 | kobject_register(&mddev->kobj); | |
1da177e4 LT |
2171 | return NULL; |
2172 | } | |
2173 | ||
2174 | void md_wakeup_thread(mdk_thread_t *thread); | |
2175 | ||
2176 | static void md_safemode_timeout(unsigned long data) | |
2177 | { | |
2178 | mddev_t *mddev = (mddev_t *) data; | |
2179 | ||
2180 | mddev->safemode = 1; | |
2181 | md_wakeup_thread(mddev->thread); | |
2182 | } | |
2183 | ||
6ff8d8ec | 2184 | static int start_dirty_degraded; |
1da177e4 LT |
2185 | |
2186 | static int do_md_run(mddev_t * mddev) | |
2187 | { | |
2604b703 | 2188 | int err; |
1da177e4 LT |
2189 | int chunk_size; |
2190 | struct list_head *tmp; | |
2191 | mdk_rdev_t *rdev; | |
2192 | struct gendisk *disk; | |
2604b703 | 2193 | struct mdk_personality *pers; |
1da177e4 LT |
2194 | char b[BDEVNAME_SIZE]; |
2195 | ||
a757e64c N |
2196 | if (list_empty(&mddev->disks)) |
2197 | /* cannot run an array with no devices.. */ | |
1da177e4 | 2198 | return -EINVAL; |
1da177e4 LT |
2199 | |
2200 | if (mddev->pers) | |
2201 | return -EBUSY; | |
2202 | ||
2203 | /* | |
2204 | * Analyze all RAID superblock(s) | |
2205 | */ | |
a757e64c N |
2206 | if (!mddev->raid_disks) |
2207 | analyze_sbs(mddev); | |
1da177e4 LT |
2208 | |
2209 | chunk_size = mddev->chunk_size; | |
2604b703 N |
2210 | |
2211 | if (chunk_size) { | |
1da177e4 LT |
2212 | if (chunk_size > MAX_CHUNK_SIZE) { |
2213 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
2214 | chunk_size, MAX_CHUNK_SIZE); | |
2215 | return -EINVAL; | |
2216 | } | |
2217 | /* | |
2218 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
2219 | */ | |
2220 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 2221 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
2222 | return -EINVAL; |
2223 | } | |
2224 | if (chunk_size < PAGE_SIZE) { | |
2225 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
2226 | chunk_size, PAGE_SIZE); | |
2227 | return -EINVAL; | |
2228 | } | |
2229 | ||
2230 | /* devices must have minimum size of one chunk */ | |
2231 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2232 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2233 | continue; |
2234 | if (rdev->size < chunk_size / 1024) { | |
2235 | printk(KERN_WARNING | |
2236 | "md: Dev %s smaller than chunk_size:" | |
2237 | " %lluk < %dk\n", | |
2238 | bdevname(rdev->bdev,b), | |
2239 | (unsigned long long)rdev->size, | |
2240 | chunk_size / 1024); | |
2241 | return -EINVAL; | |
2242 | } | |
2243 | } | |
2244 | } | |
2245 | ||
1da177e4 | 2246 | #ifdef CONFIG_KMOD |
d9d166c2 N |
2247 | if (mddev->level != LEVEL_NONE) |
2248 | request_module("md-level-%d", mddev->level); | |
2249 | else if (mddev->clevel[0]) | |
2250 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
2251 | #endif |
2252 | ||
2253 | /* | |
2254 | * Drop all container device buffers, from now on | |
2255 | * the only valid external interface is through the md | |
2256 | * device. | |
2257 | * Also find largest hardsector size | |
2258 | */ | |
2259 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2260 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2261 | continue; |
2262 | sync_blockdev(rdev->bdev); | |
2263 | invalidate_bdev(rdev->bdev, 0); | |
2264 | } | |
2265 | ||
2266 | md_probe(mddev->unit, NULL, NULL); | |
2267 | disk = mddev->gendisk; | |
2268 | if (!disk) | |
2269 | return -ENOMEM; | |
2270 | ||
2271 | spin_lock(&pers_lock); | |
d9d166c2 | 2272 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 2273 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 2274 | spin_unlock(&pers_lock); |
d9d166c2 N |
2275 | if (mddev->level != LEVEL_NONE) |
2276 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
2277 | mddev->level); | |
2278 | else | |
2279 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
2280 | mddev->clevel); | |
1da177e4 LT |
2281 | return -EINVAL; |
2282 | } | |
2604b703 | 2283 | mddev->pers = pers; |
1da177e4 | 2284 | spin_unlock(&pers_lock); |
d9d166c2 N |
2285 | mddev->level = pers->level; |
2286 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 2287 | |
657390d2 | 2288 | mddev->recovery = 0; |
1da177e4 | 2289 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 2290 | mddev->barriers_work = 1; |
6ff8d8ec | 2291 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 2292 | |
f91de92e N |
2293 | if (start_readonly) |
2294 | mddev->ro = 2; /* read-only, but switch on first write */ | |
2295 | ||
b15c2e57 N |
2296 | err = mddev->pers->run(mddev); |
2297 | if (!err && mddev->pers->sync_request) { | |
2298 | err = bitmap_create(mddev); | |
2299 | if (err) { | |
2300 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
2301 | mdname(mddev), err); | |
2302 | mddev->pers->stop(mddev); | |
2303 | } | |
2304 | } | |
1da177e4 LT |
2305 | if (err) { |
2306 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
2307 | module_put(mddev->pers->owner); | |
2308 | mddev->pers = NULL; | |
32a7627c N |
2309 | bitmap_destroy(mddev); |
2310 | return err; | |
1da177e4 | 2311 | } |
411036fa N |
2312 | if (mddev->pers->sync_request) |
2313 | sysfs_create_group(&mddev->kobj, &md_redundancy_group); | |
fd9d49ca N |
2314 | else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
2315 | mddev->ro = 0; | |
2316 | ||
1da177e4 LT |
2317 | atomic_set(&mddev->writes_pending,0); |
2318 | mddev->safemode = 0; | |
2319 | mddev->safemode_timer.function = md_safemode_timeout; | |
2320 | mddev->safemode_timer.data = (unsigned long) mddev; | |
2321 | mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ | |
2322 | mddev->in_sync = 1; | |
86e6ffdd N |
2323 | |
2324 | ITERATE_RDEV(mddev,rdev,tmp) | |
2325 | if (rdev->raid_disk >= 0) { | |
2326 | char nm[20]; | |
2327 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2328 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
2329 | } | |
1da177e4 LT |
2330 | |
2331 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2332 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2333 | |
2334 | if (mddev->sb_dirty) | |
2335 | md_update_sb(mddev); | |
2336 | ||
2337 | set_capacity(disk, mddev->array_size<<1); | |
2338 | ||
2339 | /* If we call blk_queue_make_request here, it will | |
2340 | * re-initialise max_sectors etc which may have been | |
2341 | * refined inside -> run. So just set the bits we need to set. | |
2342 | * Most initialisation happended when we called | |
2343 | * blk_queue_make_request(..., md_fail_request) | |
2344 | * earlier. | |
2345 | */ | |
2346 | mddev->queue->queuedata = mddev; | |
2347 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
2348 | ||
2349 | mddev->changed = 1; | |
d7603b7e | 2350 | md_new_event(mddev); |
1da177e4 LT |
2351 | return 0; |
2352 | } | |
2353 | ||
2354 | static int restart_array(mddev_t *mddev) | |
2355 | { | |
2356 | struct gendisk *disk = mddev->gendisk; | |
2357 | int err; | |
2358 | ||
2359 | /* | |
2360 | * Complain if it has no devices | |
2361 | */ | |
2362 | err = -ENXIO; | |
2363 | if (list_empty(&mddev->disks)) | |
2364 | goto out; | |
2365 | ||
2366 | if (mddev->pers) { | |
2367 | err = -EBUSY; | |
2368 | if (!mddev->ro) | |
2369 | goto out; | |
2370 | ||
2371 | mddev->safemode = 0; | |
2372 | mddev->ro = 0; | |
2373 | set_disk_ro(disk, 0); | |
2374 | ||
2375 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
2376 | mdname(mddev)); | |
2377 | /* | |
2378 | * Kick recovery or resync if necessary | |
2379 | */ | |
2380 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2381 | md_wakeup_thread(mddev->thread); | |
2382 | err = 0; | |
2383 | } else { | |
2384 | printk(KERN_ERR "md: %s has no personality assigned.\n", | |
2385 | mdname(mddev)); | |
2386 | err = -EINVAL; | |
2387 | } | |
2388 | ||
2389 | out: | |
2390 | return err; | |
2391 | } | |
2392 | ||
2393 | static int do_md_stop(mddev_t * mddev, int ro) | |
2394 | { | |
2395 | int err = 0; | |
2396 | struct gendisk *disk = mddev->gendisk; | |
2397 | ||
2398 | if (mddev->pers) { | |
2399 | if (atomic_read(&mddev->active)>2) { | |
2400 | printk("md: %s still in use.\n",mdname(mddev)); | |
2401 | return -EBUSY; | |
2402 | } | |
2403 | ||
2404 | if (mddev->sync_thread) { | |
2405 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2406 | md_unregister_thread(mddev->sync_thread); | |
2407 | mddev->sync_thread = NULL; | |
2408 | } | |
2409 | ||
2410 | del_timer_sync(&mddev->safemode_timer); | |
2411 | ||
2412 | invalidate_partition(disk, 0); | |
2413 | ||
2414 | if (ro) { | |
2415 | err = -ENXIO; | |
f91de92e | 2416 | if (mddev->ro==1) |
1da177e4 LT |
2417 | goto out; |
2418 | mddev->ro = 1; | |
2419 | } else { | |
6b8b3e8a | 2420 | bitmap_flush(mddev); |
a9701a30 | 2421 | md_super_wait(mddev); |
1da177e4 LT |
2422 | if (mddev->ro) |
2423 | set_disk_ro(disk, 0); | |
2424 | blk_queue_make_request(mddev->queue, md_fail_request); | |
2425 | mddev->pers->stop(mddev); | |
411036fa N |
2426 | if (mddev->pers->sync_request) |
2427 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
2428 | ||
1da177e4 LT |
2429 | module_put(mddev->pers->owner); |
2430 | mddev->pers = NULL; | |
2431 | if (mddev->ro) | |
2432 | mddev->ro = 0; | |
2433 | } | |
2434 | if (!mddev->in_sync) { | |
2435 | /* mark array as shutdown cleanly */ | |
2436 | mddev->in_sync = 1; | |
2437 | md_update_sb(mddev); | |
2438 | } | |
2439 | if (ro) | |
2440 | set_disk_ro(disk, 1); | |
2441 | } | |
32a7627c N |
2442 | |
2443 | bitmap_destroy(mddev); | |
2444 | if (mddev->bitmap_file) { | |
2445 | atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1); | |
2446 | fput(mddev->bitmap_file); | |
2447 | mddev->bitmap_file = NULL; | |
2448 | } | |
9223214e | 2449 | mddev->bitmap_offset = 0; |
32a7627c | 2450 | |
1da177e4 LT |
2451 | /* |
2452 | * Free resources if final stop | |
2453 | */ | |
2454 | if (!ro) { | |
86e6ffdd N |
2455 | mdk_rdev_t *rdev; |
2456 | struct list_head *tmp; | |
1da177e4 LT |
2457 | struct gendisk *disk; |
2458 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); | |
2459 | ||
86e6ffdd N |
2460 | ITERATE_RDEV(mddev,rdev,tmp) |
2461 | if (rdev->raid_disk >= 0) { | |
2462 | char nm[20]; | |
2463 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2464 | sysfs_remove_link(&mddev->kobj, nm); | |
2465 | } | |
2466 | ||
1da177e4 LT |
2467 | export_array(mddev); |
2468 | ||
2469 | mddev->array_size = 0; | |
2470 | disk = mddev->gendisk; | |
2471 | if (disk) | |
2472 | set_capacity(disk, 0); | |
2473 | mddev->changed = 1; | |
2474 | } else | |
2475 | printk(KERN_INFO "md: %s switched to read-only mode.\n", | |
2476 | mdname(mddev)); | |
2477 | err = 0; | |
d7603b7e | 2478 | md_new_event(mddev); |
1da177e4 LT |
2479 | out: |
2480 | return err; | |
2481 | } | |
2482 | ||
2483 | static void autorun_array(mddev_t *mddev) | |
2484 | { | |
2485 | mdk_rdev_t *rdev; | |
2486 | struct list_head *tmp; | |
2487 | int err; | |
2488 | ||
a757e64c | 2489 | if (list_empty(&mddev->disks)) |
1da177e4 | 2490 | return; |
1da177e4 LT |
2491 | |
2492 | printk(KERN_INFO "md: running: "); | |
2493 | ||
2494 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2495 | char b[BDEVNAME_SIZE]; | |
2496 | printk("<%s>", bdevname(rdev->bdev,b)); | |
2497 | } | |
2498 | printk("\n"); | |
2499 | ||
2500 | err = do_md_run (mddev); | |
2501 | if (err) { | |
2502 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
2503 | do_md_stop (mddev, 0); | |
2504 | } | |
2505 | } | |
2506 | ||
2507 | /* | |
2508 | * lets try to run arrays based on all disks that have arrived | |
2509 | * until now. (those are in pending_raid_disks) | |
2510 | * | |
2511 | * the method: pick the first pending disk, collect all disks with | |
2512 | * the same UUID, remove all from the pending list and put them into | |
2513 | * the 'same_array' list. Then order this list based on superblock | |
2514 | * update time (freshest comes first), kick out 'old' disks and | |
2515 | * compare superblocks. If everything's fine then run it. | |
2516 | * | |
2517 | * If "unit" is allocated, then bump its reference count | |
2518 | */ | |
2519 | static void autorun_devices(int part) | |
2520 | { | |
2521 | struct list_head candidates; | |
2522 | struct list_head *tmp; | |
2523 | mdk_rdev_t *rdev0, *rdev; | |
2524 | mddev_t *mddev; | |
2525 | char b[BDEVNAME_SIZE]; | |
2526 | ||
2527 | printk(KERN_INFO "md: autorun ...\n"); | |
2528 | while (!list_empty(&pending_raid_disks)) { | |
2529 | dev_t dev; | |
2530 | rdev0 = list_entry(pending_raid_disks.next, | |
2531 | mdk_rdev_t, same_set); | |
2532 | ||
2533 | printk(KERN_INFO "md: considering %s ...\n", | |
2534 | bdevname(rdev0->bdev,b)); | |
2535 | INIT_LIST_HEAD(&candidates); | |
2536 | ITERATE_RDEV_PENDING(rdev,tmp) | |
2537 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
2538 | printk(KERN_INFO "md: adding %s ...\n", | |
2539 | bdevname(rdev->bdev,b)); | |
2540 | list_move(&rdev->same_set, &candidates); | |
2541 | } | |
2542 | /* | |
2543 | * now we have a set of devices, with all of them having | |
2544 | * mostly sane superblocks. It's time to allocate the | |
2545 | * mddev. | |
2546 | */ | |
2547 | if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { | |
2548 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", | |
2549 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
2550 | break; | |
2551 | } | |
2552 | if (part) | |
2553 | dev = MKDEV(mdp_major, | |
2554 | rdev0->preferred_minor << MdpMinorShift); | |
2555 | else | |
2556 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
2557 | ||
2558 | md_probe(dev, NULL, NULL); | |
2559 | mddev = mddev_find(dev); | |
2560 | if (!mddev) { | |
2561 | printk(KERN_ERR | |
2562 | "md: cannot allocate memory for md drive.\n"); | |
2563 | break; | |
2564 | } | |
2565 | if (mddev_lock(mddev)) | |
2566 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
2567 | mdname(mddev)); | |
2568 | else if (mddev->raid_disks || mddev->major_version | |
2569 | || !list_empty(&mddev->disks)) { | |
2570 | printk(KERN_WARNING | |
2571 | "md: %s already running, cannot run %s\n", | |
2572 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
2573 | mddev_unlock(mddev); | |
2574 | } else { | |
2575 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
2576 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { | |
2577 | list_del_init(&rdev->same_set); | |
2578 | if (bind_rdev_to_array(rdev, mddev)) | |
2579 | export_rdev(rdev); | |
2580 | } | |
2581 | autorun_array(mddev); | |
2582 | mddev_unlock(mddev); | |
2583 | } | |
2584 | /* on success, candidates will be empty, on error | |
2585 | * it won't... | |
2586 | */ | |
2587 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) | |
2588 | export_rdev(rdev); | |
2589 | mddev_put(mddev); | |
2590 | } | |
2591 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
2592 | } | |
2593 | ||
2594 | /* | |
2595 | * import RAID devices based on one partition | |
2596 | * if possible, the array gets run as well. | |
2597 | */ | |
2598 | ||
2599 | static int autostart_array(dev_t startdev) | |
2600 | { | |
2601 | char b[BDEVNAME_SIZE]; | |
2602 | int err = -EINVAL, i; | |
2603 | mdp_super_t *sb = NULL; | |
2604 | mdk_rdev_t *start_rdev = NULL, *rdev; | |
2605 | ||
2606 | start_rdev = md_import_device(startdev, 0, 0); | |
2607 | if (IS_ERR(start_rdev)) | |
2608 | return err; | |
2609 | ||
2610 | ||
2611 | /* NOTE: this can only work for 0.90.0 superblocks */ | |
2612 | sb = (mdp_super_t*)page_address(start_rdev->sb_page); | |
2613 | if (sb->major_version != 0 || | |
2614 | sb->minor_version != 90 ) { | |
2615 | printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); | |
2616 | export_rdev(start_rdev); | |
2617 | return err; | |
2618 | } | |
2619 | ||
b2d444d7 | 2620 | if (test_bit(Faulty, &start_rdev->flags)) { |
1da177e4 LT |
2621 | printk(KERN_WARNING |
2622 | "md: can not autostart based on faulty %s!\n", | |
2623 | bdevname(start_rdev->bdev,b)); | |
2624 | export_rdev(start_rdev); | |
2625 | return err; | |
2626 | } | |
2627 | list_add(&start_rdev->same_set, &pending_raid_disks); | |
2628 | ||
2629 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2630 | mdp_disk_t *desc = sb->disks + i; | |
2631 | dev_t dev = MKDEV(desc->major, desc->minor); | |
2632 | ||
2633 | if (!dev) | |
2634 | continue; | |
2635 | if (dev == startdev) | |
2636 | continue; | |
2637 | if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) | |
2638 | continue; | |
2639 | rdev = md_import_device(dev, 0, 0); | |
2640 | if (IS_ERR(rdev)) | |
2641 | continue; | |
2642 | ||
2643 | list_add(&rdev->same_set, &pending_raid_disks); | |
2644 | } | |
2645 | ||
2646 | /* | |
2647 | * possibly return codes | |
2648 | */ | |
2649 | autorun_devices(0); | |
2650 | return 0; | |
2651 | ||
2652 | } | |
2653 | ||
2654 | ||
2655 | static int get_version(void __user * arg) | |
2656 | { | |
2657 | mdu_version_t ver; | |
2658 | ||
2659 | ver.major = MD_MAJOR_VERSION; | |
2660 | ver.minor = MD_MINOR_VERSION; | |
2661 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
2662 | ||
2663 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
2664 | return -EFAULT; | |
2665 | ||
2666 | return 0; | |
2667 | } | |
2668 | ||
2669 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
2670 | { | |
2671 | mdu_array_info_t info; | |
2672 | int nr,working,active,failed,spare; | |
2673 | mdk_rdev_t *rdev; | |
2674 | struct list_head *tmp; | |
2675 | ||
2676 | nr=working=active=failed=spare=0; | |
2677 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2678 | nr++; | |
b2d444d7 | 2679 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2680 | failed++; |
2681 | else { | |
2682 | working++; | |
b2d444d7 | 2683 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
2684 | active++; |
2685 | else | |
2686 | spare++; | |
2687 | } | |
2688 | } | |
2689 | ||
2690 | info.major_version = mddev->major_version; | |
2691 | info.minor_version = mddev->minor_version; | |
2692 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
2693 | info.ctime = mddev->ctime; | |
2694 | info.level = mddev->level; | |
2695 | info.size = mddev->size; | |
2696 | info.nr_disks = nr; | |
2697 | info.raid_disks = mddev->raid_disks; | |
2698 | info.md_minor = mddev->md_minor; | |
2699 | info.not_persistent= !mddev->persistent; | |
2700 | ||
2701 | info.utime = mddev->utime; | |
2702 | info.state = 0; | |
2703 | if (mddev->in_sync) | |
2704 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
2705 | if (mddev->bitmap && mddev->bitmap_offset) |
2706 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
2707 | info.active_disks = active; |
2708 | info.working_disks = working; | |
2709 | info.failed_disks = failed; | |
2710 | info.spare_disks = spare; | |
2711 | ||
2712 | info.layout = mddev->layout; | |
2713 | info.chunk_size = mddev->chunk_size; | |
2714 | ||
2715 | if (copy_to_user(arg, &info, sizeof(info))) | |
2716 | return -EFAULT; | |
2717 | ||
2718 | return 0; | |
2719 | } | |
2720 | ||
87162a28 | 2721 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
2722 | { |
2723 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
2724 | char *ptr, *buf = NULL; | |
2725 | int err = -ENOMEM; | |
2726 | ||
2727 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2728 | if (!file) | |
2729 | goto out; | |
2730 | ||
2731 | /* bitmap disabled, zero the first byte and copy out */ | |
2732 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
2733 | file->pathname[0] = '\0'; | |
2734 | goto copy_out; | |
2735 | } | |
2736 | ||
2737 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
2738 | if (!buf) | |
2739 | goto out; | |
2740 | ||
2741 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
2742 | if (!ptr) | |
2743 | goto out; | |
2744 | ||
2745 | strcpy(file->pathname, ptr); | |
2746 | ||
2747 | copy_out: | |
2748 | err = 0; | |
2749 | if (copy_to_user(arg, file, sizeof(*file))) | |
2750 | err = -EFAULT; | |
2751 | out: | |
2752 | kfree(buf); | |
2753 | kfree(file); | |
2754 | return err; | |
2755 | } | |
2756 | ||
1da177e4 LT |
2757 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
2758 | { | |
2759 | mdu_disk_info_t info; | |
2760 | unsigned int nr; | |
2761 | mdk_rdev_t *rdev; | |
2762 | ||
2763 | if (copy_from_user(&info, arg, sizeof(info))) | |
2764 | return -EFAULT; | |
2765 | ||
2766 | nr = info.number; | |
2767 | ||
2768 | rdev = find_rdev_nr(mddev, nr); | |
2769 | if (rdev) { | |
2770 | info.major = MAJOR(rdev->bdev->bd_dev); | |
2771 | info.minor = MINOR(rdev->bdev->bd_dev); | |
2772 | info.raid_disk = rdev->raid_disk; | |
2773 | info.state = 0; | |
b2d444d7 | 2774 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 2775 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 2776 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2777 | info.state |= (1<<MD_DISK_ACTIVE); |
2778 | info.state |= (1<<MD_DISK_SYNC); | |
2779 | } | |
8ddf9efe N |
2780 | if (test_bit(WriteMostly, &rdev->flags)) |
2781 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
2782 | } else { |
2783 | info.major = info.minor = 0; | |
2784 | info.raid_disk = -1; | |
2785 | info.state = (1<<MD_DISK_REMOVED); | |
2786 | } | |
2787 | ||
2788 | if (copy_to_user(arg, &info, sizeof(info))) | |
2789 | return -EFAULT; | |
2790 | ||
2791 | return 0; | |
2792 | } | |
2793 | ||
2794 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
2795 | { | |
2796 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
2797 | mdk_rdev_t *rdev; | |
2798 | dev_t dev = MKDEV(info->major,info->minor); | |
2799 | ||
2800 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
2801 | return -EOVERFLOW; | |
2802 | ||
2803 | if (!mddev->raid_disks) { | |
2804 | int err; | |
2805 | /* expecting a device which has a superblock */ | |
2806 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
2807 | if (IS_ERR(rdev)) { | |
2808 | printk(KERN_WARNING | |
2809 | "md: md_import_device returned %ld\n", | |
2810 | PTR_ERR(rdev)); | |
2811 | return PTR_ERR(rdev); | |
2812 | } | |
2813 | if (!list_empty(&mddev->disks)) { | |
2814 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2815 | mdk_rdev_t, same_set); | |
2816 | int err = super_types[mddev->major_version] | |
2817 | .load_super(rdev, rdev0, mddev->minor_version); | |
2818 | if (err < 0) { | |
2819 | printk(KERN_WARNING | |
2820 | "md: %s has different UUID to %s\n", | |
2821 | bdevname(rdev->bdev,b), | |
2822 | bdevname(rdev0->bdev,b2)); | |
2823 | export_rdev(rdev); | |
2824 | return -EINVAL; | |
2825 | } | |
2826 | } | |
2827 | err = bind_rdev_to_array(rdev, mddev); | |
2828 | if (err) | |
2829 | export_rdev(rdev); | |
2830 | return err; | |
2831 | } | |
2832 | ||
2833 | /* | |
2834 | * add_new_disk can be used once the array is assembled | |
2835 | * to add "hot spares". They must already have a superblock | |
2836 | * written | |
2837 | */ | |
2838 | if (mddev->pers) { | |
2839 | int err; | |
2840 | if (!mddev->pers->hot_add_disk) { | |
2841 | printk(KERN_WARNING | |
2842 | "%s: personality does not support diskops!\n", | |
2843 | mdname(mddev)); | |
2844 | return -EINVAL; | |
2845 | } | |
7b1e35f6 N |
2846 | if (mddev->persistent) |
2847 | rdev = md_import_device(dev, mddev->major_version, | |
2848 | mddev->minor_version); | |
2849 | else | |
2850 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
2851 | if (IS_ERR(rdev)) { |
2852 | printk(KERN_WARNING | |
2853 | "md: md_import_device returned %ld\n", | |
2854 | PTR_ERR(rdev)); | |
2855 | return PTR_ERR(rdev); | |
2856 | } | |
41158c7e N |
2857 | /* set save_raid_disk if appropriate */ |
2858 | if (!mddev->persistent) { | |
2859 | if (info->state & (1<<MD_DISK_SYNC) && | |
2860 | info->raid_disk < mddev->raid_disks) | |
2861 | rdev->raid_disk = info->raid_disk; | |
2862 | else | |
2863 | rdev->raid_disk = -1; | |
2864 | } else | |
2865 | super_types[mddev->major_version]. | |
2866 | validate_super(mddev, rdev); | |
2867 | rdev->saved_raid_disk = rdev->raid_disk; | |
2868 | ||
b2d444d7 | 2869 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
2870 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
2871 | set_bit(WriteMostly, &rdev->flags); | |
2872 | ||
1da177e4 LT |
2873 | rdev->raid_disk = -1; |
2874 | err = bind_rdev_to_array(rdev, mddev); | |
2875 | if (err) | |
2876 | export_rdev(rdev); | |
c361777f N |
2877 | |
2878 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2879 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2880 | return err; |
2881 | } | |
2882 | ||
2883 | /* otherwise, add_new_disk is only allowed | |
2884 | * for major_version==0 superblocks | |
2885 | */ | |
2886 | if (mddev->major_version != 0) { | |
2887 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
2888 | mdname(mddev)); | |
2889 | return -EINVAL; | |
2890 | } | |
2891 | ||
2892 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
2893 | int err; | |
2894 | rdev = md_import_device (dev, -1, 0); | |
2895 | if (IS_ERR(rdev)) { | |
2896 | printk(KERN_WARNING | |
2897 | "md: error, md_import_device() returned %ld\n", | |
2898 | PTR_ERR(rdev)); | |
2899 | return PTR_ERR(rdev); | |
2900 | } | |
2901 | rdev->desc_nr = info->number; | |
2902 | if (info->raid_disk < mddev->raid_disks) | |
2903 | rdev->raid_disk = info->raid_disk; | |
2904 | else | |
2905 | rdev->raid_disk = -1; | |
2906 | ||
b2d444d7 N |
2907 | rdev->flags = 0; |
2908 | ||
1da177e4 | 2909 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
2910 | if (info->state & (1<<MD_DISK_SYNC)) |
2911 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 2912 | |
8ddf9efe N |
2913 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
2914 | set_bit(WriteMostly, &rdev->flags); | |
2915 | ||
1da177e4 LT |
2916 | if (!mddev->persistent) { |
2917 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
2918 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2919 | } else | |
2920 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
2921 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
2922 | ||
2bf071bf N |
2923 | err = bind_rdev_to_array(rdev, mddev); |
2924 | if (err) { | |
2925 | export_rdev(rdev); | |
2926 | return err; | |
2927 | } | |
1da177e4 LT |
2928 | } |
2929 | ||
2930 | return 0; | |
2931 | } | |
2932 | ||
2933 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
2934 | { | |
2935 | char b[BDEVNAME_SIZE]; | |
2936 | mdk_rdev_t *rdev; | |
2937 | ||
2938 | if (!mddev->pers) | |
2939 | return -ENODEV; | |
2940 | ||
2941 | rdev = find_rdev(mddev, dev); | |
2942 | if (!rdev) | |
2943 | return -ENXIO; | |
2944 | ||
2945 | if (rdev->raid_disk >= 0) | |
2946 | goto busy; | |
2947 | ||
2948 | kick_rdev_from_array(rdev); | |
2949 | md_update_sb(mddev); | |
d7603b7e | 2950 | md_new_event(mddev); |
1da177e4 LT |
2951 | |
2952 | return 0; | |
2953 | busy: | |
2954 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", | |
2955 | bdevname(rdev->bdev,b), mdname(mddev)); | |
2956 | return -EBUSY; | |
2957 | } | |
2958 | ||
2959 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
2960 | { | |
2961 | char b[BDEVNAME_SIZE]; | |
2962 | int err; | |
2963 | unsigned int size; | |
2964 | mdk_rdev_t *rdev; | |
2965 | ||
2966 | if (!mddev->pers) | |
2967 | return -ENODEV; | |
2968 | ||
2969 | if (mddev->major_version != 0) { | |
2970 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
2971 | " version-0 superblocks.\n", | |
2972 | mdname(mddev)); | |
2973 | return -EINVAL; | |
2974 | } | |
2975 | if (!mddev->pers->hot_add_disk) { | |
2976 | printk(KERN_WARNING | |
2977 | "%s: personality does not support diskops!\n", | |
2978 | mdname(mddev)); | |
2979 | return -EINVAL; | |
2980 | } | |
2981 | ||
2982 | rdev = md_import_device (dev, -1, 0); | |
2983 | if (IS_ERR(rdev)) { | |
2984 | printk(KERN_WARNING | |
2985 | "md: error, md_import_device() returned %ld\n", | |
2986 | PTR_ERR(rdev)); | |
2987 | return -EINVAL; | |
2988 | } | |
2989 | ||
2990 | if (mddev->persistent) | |
2991 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
2992 | else | |
2993 | rdev->sb_offset = | |
2994 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2995 | ||
2996 | size = calc_dev_size(rdev, mddev->chunk_size); | |
2997 | rdev->size = size; | |
2998 | ||
b2d444d7 | 2999 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
3000 | printk(KERN_WARNING |
3001 | "md: can not hot-add faulty %s disk to %s!\n", | |
3002 | bdevname(rdev->bdev,b), mdname(mddev)); | |
3003 | err = -EINVAL; | |
3004 | goto abort_export; | |
3005 | } | |
b2d444d7 | 3006 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 3007 | rdev->desc_nr = -1; |
2bf071bf N |
3008 | err = bind_rdev_to_array(rdev, mddev); |
3009 | if (err) | |
3010 | goto abort_export; | |
1da177e4 LT |
3011 | |
3012 | /* | |
3013 | * The rest should better be atomic, we can have disk failures | |
3014 | * noticed in interrupt contexts ... | |
3015 | */ | |
3016 | ||
3017 | if (rdev->desc_nr == mddev->max_disks) { | |
3018 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
3019 | mdname(mddev)); | |
3020 | err = -EBUSY; | |
3021 | goto abort_unbind_export; | |
3022 | } | |
3023 | ||
3024 | rdev->raid_disk = -1; | |
3025 | ||
3026 | md_update_sb(mddev); | |
3027 | ||
3028 | /* | |
3029 | * Kick recovery, maybe this spare has to be added to the | |
3030 | * array immediately. | |
3031 | */ | |
3032 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3033 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 3034 | md_new_event(mddev); |
1da177e4 LT |
3035 | return 0; |
3036 | ||
3037 | abort_unbind_export: | |
3038 | unbind_rdev_from_array(rdev); | |
3039 | ||
3040 | abort_export: | |
3041 | export_rdev(rdev); | |
3042 | return err; | |
3043 | } | |
3044 | ||
32a7627c N |
3045 | /* similar to deny_write_access, but accounts for our holding a reference |
3046 | * to the file ourselves */ | |
3047 | static int deny_bitmap_write_access(struct file * file) | |
3048 | { | |
3049 | struct inode *inode = file->f_mapping->host; | |
3050 | ||
3051 | spin_lock(&inode->i_lock); | |
3052 | if (atomic_read(&inode->i_writecount) > 1) { | |
3053 | spin_unlock(&inode->i_lock); | |
3054 | return -ETXTBSY; | |
3055 | } | |
3056 | atomic_set(&inode->i_writecount, -1); | |
3057 | spin_unlock(&inode->i_lock); | |
3058 | ||
3059 | return 0; | |
3060 | } | |
3061 | ||
3062 | static int set_bitmap_file(mddev_t *mddev, int fd) | |
3063 | { | |
3064 | int err; | |
3065 | ||
36fa3063 N |
3066 | if (mddev->pers) { |
3067 | if (!mddev->pers->quiesce) | |
3068 | return -EBUSY; | |
3069 | if (mddev->recovery || mddev->sync_thread) | |
3070 | return -EBUSY; | |
3071 | /* we should be able to change the bitmap.. */ | |
3072 | } | |
32a7627c | 3073 | |
32a7627c | 3074 | |
36fa3063 N |
3075 | if (fd >= 0) { |
3076 | if (mddev->bitmap) | |
3077 | return -EEXIST; /* cannot add when bitmap is present */ | |
3078 | mddev->bitmap_file = fget(fd); | |
32a7627c | 3079 | |
36fa3063 N |
3080 | if (mddev->bitmap_file == NULL) { |
3081 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
3082 | mdname(mddev)); | |
3083 | return -EBADF; | |
3084 | } | |
3085 | ||
3086 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
3087 | if (err) { | |
3088 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
3089 | mdname(mddev)); | |
3090 | fput(mddev->bitmap_file); | |
3091 | mddev->bitmap_file = NULL; | |
3092 | return err; | |
3093 | } | |
a654b9d8 | 3094 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
3095 | } else if (mddev->bitmap == NULL) |
3096 | return -ENOENT; /* cannot remove what isn't there */ | |
3097 | err = 0; | |
3098 | if (mddev->pers) { | |
3099 | mddev->pers->quiesce(mddev, 1); | |
3100 | if (fd >= 0) | |
3101 | err = bitmap_create(mddev); | |
3102 | if (fd < 0 || err) | |
3103 | bitmap_destroy(mddev); | |
3104 | mddev->pers->quiesce(mddev, 0); | |
3105 | } else if (fd < 0) { | |
3106 | if (mddev->bitmap_file) | |
3107 | fput(mddev->bitmap_file); | |
3108 | mddev->bitmap_file = NULL; | |
3109 | } | |
3110 | ||
32a7627c N |
3111 | return err; |
3112 | } | |
3113 | ||
1da177e4 LT |
3114 | /* |
3115 | * set_array_info is used two different ways | |
3116 | * The original usage is when creating a new array. | |
3117 | * In this usage, raid_disks is > 0 and it together with | |
3118 | * level, size, not_persistent,layout,chunksize determine the | |
3119 | * shape of the array. | |
3120 | * This will always create an array with a type-0.90.0 superblock. | |
3121 | * The newer usage is when assembling an array. | |
3122 | * In this case raid_disks will be 0, and the major_version field is | |
3123 | * use to determine which style super-blocks are to be found on the devices. | |
3124 | * The minor and patch _version numbers are also kept incase the | |
3125 | * super_block handler wishes to interpret them. | |
3126 | */ | |
3127 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
3128 | { | |
3129 | ||
3130 | if (info->raid_disks == 0) { | |
3131 | /* just setting version number for superblock loading */ | |
3132 | if (info->major_version < 0 || | |
3133 | info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || | |
3134 | super_types[info->major_version].name == NULL) { | |
3135 | /* maybe try to auto-load a module? */ | |
3136 | printk(KERN_INFO | |
3137 | "md: superblock version %d not known\n", | |
3138 | info->major_version); | |
3139 | return -EINVAL; | |
3140 | } | |
3141 | mddev->major_version = info->major_version; | |
3142 | mddev->minor_version = info->minor_version; | |
3143 | mddev->patch_version = info->patch_version; | |
3144 | return 0; | |
3145 | } | |
3146 | mddev->major_version = MD_MAJOR_VERSION; | |
3147 | mddev->minor_version = MD_MINOR_VERSION; | |
3148 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
3149 | mddev->ctime = get_seconds(); | |
3150 | ||
3151 | mddev->level = info->level; | |
3152 | mddev->size = info->size; | |
3153 | mddev->raid_disks = info->raid_disks; | |
3154 | /* don't set md_minor, it is determined by which /dev/md* was | |
3155 | * openned | |
3156 | */ | |
3157 | if (info->state & (1<<MD_SB_CLEAN)) | |
3158 | mddev->recovery_cp = MaxSector; | |
3159 | else | |
3160 | mddev->recovery_cp = 0; | |
3161 | mddev->persistent = ! info->not_persistent; | |
3162 | ||
3163 | mddev->layout = info->layout; | |
3164 | mddev->chunk_size = info->chunk_size; | |
3165 | ||
3166 | mddev->max_disks = MD_SB_DISKS; | |
3167 | ||
3168 | mddev->sb_dirty = 1; | |
3169 | ||
b2a2703c N |
3170 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
3171 | mddev->bitmap_offset = 0; | |
3172 | ||
1da177e4 LT |
3173 | /* |
3174 | * Generate a 128 bit UUID | |
3175 | */ | |
3176 | get_random_bytes(mddev->uuid, 16); | |
3177 | ||
3178 | return 0; | |
3179 | } | |
3180 | ||
a35b0d69 N |
3181 | static int update_size(mddev_t *mddev, unsigned long size) |
3182 | { | |
3183 | mdk_rdev_t * rdev; | |
3184 | int rv; | |
3185 | struct list_head *tmp; | |
3186 | ||
3187 | if (mddev->pers->resize == NULL) | |
3188 | return -EINVAL; | |
3189 | /* The "size" is the amount of each device that is used. | |
3190 | * This can only make sense for arrays with redundancy. | |
3191 | * linear and raid0 always use whatever space is available | |
3192 | * We can only consider changing the size if no resync | |
3193 | * or reconstruction is happening, and if the new size | |
3194 | * is acceptable. It must fit before the sb_offset or, | |
3195 | * if that is <data_offset, it must fit before the | |
3196 | * size of each device. | |
3197 | * If size is zero, we find the largest size that fits. | |
3198 | */ | |
3199 | if (mddev->sync_thread) | |
3200 | return -EBUSY; | |
3201 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3202 | sector_t avail; | |
3203 | int fit = (size == 0); | |
3204 | if (rdev->sb_offset > rdev->data_offset) | |
3205 | avail = (rdev->sb_offset*2) - rdev->data_offset; | |
3206 | else | |
3207 | avail = get_capacity(rdev->bdev->bd_disk) | |
3208 | - rdev->data_offset; | |
3209 | if (fit && (size == 0 || size > avail/2)) | |
3210 | size = avail/2; | |
3211 | if (avail < ((sector_t)size << 1)) | |
3212 | return -ENOSPC; | |
3213 | } | |
3214 | rv = mddev->pers->resize(mddev, (sector_t)size *2); | |
3215 | if (!rv) { | |
3216 | struct block_device *bdev; | |
3217 | ||
3218 | bdev = bdget_disk(mddev->gendisk, 0); | |
3219 | if (bdev) { | |
3220 | down(&bdev->bd_inode->i_sem); | |
3221 | i_size_write(bdev->bd_inode, mddev->array_size << 10); | |
3222 | up(&bdev->bd_inode->i_sem); | |
3223 | bdput(bdev); | |
3224 | } | |
3225 | } | |
3226 | return rv; | |
3227 | } | |
3228 | ||
da943b99 N |
3229 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
3230 | { | |
3231 | int rv; | |
3232 | /* change the number of raid disks */ | |
3233 | if (mddev->pers->reshape == NULL) | |
3234 | return -EINVAL; | |
3235 | if (raid_disks <= 0 || | |
3236 | raid_disks >= mddev->max_disks) | |
3237 | return -EINVAL; | |
3238 | if (mddev->sync_thread) | |
3239 | return -EBUSY; | |
3240 | rv = mddev->pers->reshape(mddev, raid_disks); | |
3241 | if (!rv) { | |
3242 | struct block_device *bdev; | |
3243 | ||
3244 | bdev = bdget_disk(mddev->gendisk, 0); | |
3245 | if (bdev) { | |
3246 | down(&bdev->bd_inode->i_sem); | |
3247 | i_size_write(bdev->bd_inode, mddev->array_size << 10); | |
3248 | up(&bdev->bd_inode->i_sem); | |
3249 | bdput(bdev); | |
3250 | } | |
3251 | } | |
3252 | return rv; | |
3253 | } | |
3254 | ||
3255 | ||
1da177e4 LT |
3256 | /* |
3257 | * update_array_info is used to change the configuration of an | |
3258 | * on-line array. | |
3259 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
3260 | * fields in the info are checked against the array. | |
3261 | * Any differences that cannot be handled will cause an error. | |
3262 | * Normally, only one change can be managed at a time. | |
3263 | */ | |
3264 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
3265 | { | |
3266 | int rv = 0; | |
3267 | int cnt = 0; | |
36fa3063 N |
3268 | int state = 0; |
3269 | ||
3270 | /* calculate expected state,ignoring low bits */ | |
3271 | if (mddev->bitmap && mddev->bitmap_offset) | |
3272 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
3273 | |
3274 | if (mddev->major_version != info->major_version || | |
3275 | mddev->minor_version != info->minor_version || | |
3276 | /* mddev->patch_version != info->patch_version || */ | |
3277 | mddev->ctime != info->ctime || | |
3278 | mddev->level != info->level || | |
3279 | /* mddev->layout != info->layout || */ | |
3280 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
3281 | mddev->chunk_size != info->chunk_size || |
3282 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
3283 | ((state^info->state) & 0xfffffe00) | |
3284 | ) | |
1da177e4 LT |
3285 | return -EINVAL; |
3286 | /* Check there is only one change */ | |
3287 | if (mddev->size != info->size) cnt++; | |
3288 | if (mddev->raid_disks != info->raid_disks) cnt++; | |
3289 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 3290 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
3291 | if (cnt == 0) return 0; |
3292 | if (cnt > 1) return -EINVAL; | |
3293 | ||
3294 | if (mddev->layout != info->layout) { | |
3295 | /* Change layout | |
3296 | * we don't need to do anything at the md level, the | |
3297 | * personality will take care of it all. | |
3298 | */ | |
3299 | if (mddev->pers->reconfig == NULL) | |
3300 | return -EINVAL; | |
3301 | else | |
3302 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
3303 | } | |
a35b0d69 N |
3304 | if (mddev->size != info->size) |
3305 | rv = update_size(mddev, info->size); | |
3306 | ||
da943b99 N |
3307 | if (mddev->raid_disks != info->raid_disks) |
3308 | rv = update_raid_disks(mddev, info->raid_disks); | |
3309 | ||
36fa3063 N |
3310 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
3311 | if (mddev->pers->quiesce == NULL) | |
3312 | return -EINVAL; | |
3313 | if (mddev->recovery || mddev->sync_thread) | |
3314 | return -EBUSY; | |
3315 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
3316 | /* add the bitmap */ | |
3317 | if (mddev->bitmap) | |
3318 | return -EEXIST; | |
3319 | if (mddev->default_bitmap_offset == 0) | |
3320 | return -EINVAL; | |
3321 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
3322 | mddev->pers->quiesce(mddev, 1); | |
3323 | rv = bitmap_create(mddev); | |
3324 | if (rv) | |
3325 | bitmap_destroy(mddev); | |
3326 | mddev->pers->quiesce(mddev, 0); | |
3327 | } else { | |
3328 | /* remove the bitmap */ | |
3329 | if (!mddev->bitmap) | |
3330 | return -ENOENT; | |
3331 | if (mddev->bitmap->file) | |
3332 | return -EINVAL; | |
3333 | mddev->pers->quiesce(mddev, 1); | |
3334 | bitmap_destroy(mddev); | |
3335 | mddev->pers->quiesce(mddev, 0); | |
3336 | mddev->bitmap_offset = 0; | |
3337 | } | |
3338 | } | |
1da177e4 LT |
3339 | md_update_sb(mddev); |
3340 | return rv; | |
3341 | } | |
3342 | ||
3343 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
3344 | { | |
3345 | mdk_rdev_t *rdev; | |
3346 | ||
3347 | if (mddev->pers == NULL) | |
3348 | return -ENODEV; | |
3349 | ||
3350 | rdev = find_rdev(mddev, dev); | |
3351 | if (!rdev) | |
3352 | return -ENODEV; | |
3353 | ||
3354 | md_error(mddev, rdev); | |
3355 | return 0; | |
3356 | } | |
3357 | ||
3358 | static int md_ioctl(struct inode *inode, struct file *file, | |
3359 | unsigned int cmd, unsigned long arg) | |
3360 | { | |
3361 | int err = 0; | |
3362 | void __user *argp = (void __user *)arg; | |
3363 | struct hd_geometry __user *loc = argp; | |
3364 | mddev_t *mddev = NULL; | |
3365 | ||
3366 | if (!capable(CAP_SYS_ADMIN)) | |
3367 | return -EACCES; | |
3368 | ||
3369 | /* | |
3370 | * Commands dealing with the RAID driver but not any | |
3371 | * particular array: | |
3372 | */ | |
3373 | switch (cmd) | |
3374 | { | |
3375 | case RAID_VERSION: | |
3376 | err = get_version(argp); | |
3377 | goto done; | |
3378 | ||
3379 | case PRINT_RAID_DEBUG: | |
3380 | err = 0; | |
3381 | md_print_devices(); | |
3382 | goto done; | |
3383 | ||
3384 | #ifndef MODULE | |
3385 | case RAID_AUTORUN: | |
3386 | err = 0; | |
3387 | autostart_arrays(arg); | |
3388 | goto done; | |
3389 | #endif | |
3390 | default:; | |
3391 | } | |
3392 | ||
3393 | /* | |
3394 | * Commands creating/starting a new array: | |
3395 | */ | |
3396 | ||
3397 | mddev = inode->i_bdev->bd_disk->private_data; | |
3398 | ||
3399 | if (!mddev) { | |
3400 | BUG(); | |
3401 | goto abort; | |
3402 | } | |
3403 | ||
3404 | ||
3405 | if (cmd == START_ARRAY) { | |
3406 | /* START_ARRAY doesn't need to lock the array as autostart_array | |
3407 | * does the locking, and it could even be a different array | |
3408 | */ | |
3409 | static int cnt = 3; | |
3410 | if (cnt > 0 ) { | |
3411 | printk(KERN_WARNING | |
3412 | "md: %s(pid %d) used deprecated START_ARRAY ioctl. " | |
e8a00334 | 3413 | "This will not be supported beyond July 2006\n", |
1da177e4 LT |
3414 | current->comm, current->pid); |
3415 | cnt--; | |
3416 | } | |
3417 | err = autostart_array(new_decode_dev(arg)); | |
3418 | if (err) { | |
3419 | printk(KERN_WARNING "md: autostart failed!\n"); | |
3420 | goto abort; | |
3421 | } | |
3422 | goto done; | |
3423 | } | |
3424 | ||
3425 | err = mddev_lock(mddev); | |
3426 | if (err) { | |
3427 | printk(KERN_INFO | |
3428 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
3429 | err, cmd); | |
3430 | goto abort; | |
3431 | } | |
3432 | ||
3433 | switch (cmd) | |
3434 | { | |
3435 | case SET_ARRAY_INFO: | |
3436 | { | |
3437 | mdu_array_info_t info; | |
3438 | if (!arg) | |
3439 | memset(&info, 0, sizeof(info)); | |
3440 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
3441 | err = -EFAULT; | |
3442 | goto abort_unlock; | |
3443 | } | |
3444 | if (mddev->pers) { | |
3445 | err = update_array_info(mddev, &info); | |
3446 | if (err) { | |
3447 | printk(KERN_WARNING "md: couldn't update" | |
3448 | " array info. %d\n", err); | |
3449 | goto abort_unlock; | |
3450 | } | |
3451 | goto done_unlock; | |
3452 | } | |
3453 | if (!list_empty(&mddev->disks)) { | |
3454 | printk(KERN_WARNING | |
3455 | "md: array %s already has disks!\n", | |
3456 | mdname(mddev)); | |
3457 | err = -EBUSY; | |
3458 | goto abort_unlock; | |
3459 | } | |
3460 | if (mddev->raid_disks) { | |
3461 | printk(KERN_WARNING | |
3462 | "md: array %s already initialised!\n", | |
3463 | mdname(mddev)); | |
3464 | err = -EBUSY; | |
3465 | goto abort_unlock; | |
3466 | } | |
3467 | err = set_array_info(mddev, &info); | |
3468 | if (err) { | |
3469 | printk(KERN_WARNING "md: couldn't set" | |
3470 | " array info. %d\n", err); | |
3471 | goto abort_unlock; | |
3472 | } | |
3473 | } | |
3474 | goto done_unlock; | |
3475 | ||
3476 | default:; | |
3477 | } | |
3478 | ||
3479 | /* | |
3480 | * Commands querying/configuring an existing array: | |
3481 | */ | |
32a7627c N |
3482 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3483 | * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ | |
3484 | if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
3485 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { | |
1da177e4 LT |
3486 | err = -ENODEV; |
3487 | goto abort_unlock; | |
3488 | } | |
3489 | ||
3490 | /* | |
3491 | * Commands even a read-only array can execute: | |
3492 | */ | |
3493 | switch (cmd) | |
3494 | { | |
3495 | case GET_ARRAY_INFO: | |
3496 | err = get_array_info(mddev, argp); | |
3497 | goto done_unlock; | |
3498 | ||
32a7627c | 3499 | case GET_BITMAP_FILE: |
87162a28 | 3500 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
3501 | goto done_unlock; |
3502 | ||
1da177e4 LT |
3503 | case GET_DISK_INFO: |
3504 | err = get_disk_info(mddev, argp); | |
3505 | goto done_unlock; | |
3506 | ||
3507 | case RESTART_ARRAY_RW: | |
3508 | err = restart_array(mddev); | |
3509 | goto done_unlock; | |
3510 | ||
3511 | case STOP_ARRAY: | |
3512 | err = do_md_stop (mddev, 0); | |
3513 | goto done_unlock; | |
3514 | ||
3515 | case STOP_ARRAY_RO: | |
3516 | err = do_md_stop (mddev, 1); | |
3517 | goto done_unlock; | |
3518 | ||
3519 | /* | |
3520 | * We have a problem here : there is no easy way to give a CHS | |
3521 | * virtual geometry. We currently pretend that we have a 2 heads | |
3522 | * 4 sectors (with a BIG number of cylinders...). This drives | |
3523 | * dosfs just mad... ;-) | |
3524 | */ | |
3525 | case HDIO_GETGEO: | |
3526 | if (!loc) { | |
3527 | err = -EINVAL; | |
3528 | goto abort_unlock; | |
3529 | } | |
3530 | err = put_user (2, (char __user *) &loc->heads); | |
3531 | if (err) | |
3532 | goto abort_unlock; | |
3533 | err = put_user (4, (char __user *) &loc->sectors); | |
3534 | if (err) | |
3535 | goto abort_unlock; | |
3536 | err = put_user(get_capacity(mddev->gendisk)/8, | |
3537 | (short __user *) &loc->cylinders); | |
3538 | if (err) | |
3539 | goto abort_unlock; | |
3540 | err = put_user (get_start_sect(inode->i_bdev), | |
3541 | (long __user *) &loc->start); | |
3542 | goto done_unlock; | |
3543 | } | |
3544 | ||
3545 | /* | |
3546 | * The remaining ioctls are changing the state of the | |
f91de92e N |
3547 | * superblock, so we do not allow them on read-only arrays. |
3548 | * However non-MD ioctls (e.g. get-size) will still come through | |
3549 | * here and hit the 'default' below, so only disallow | |
3550 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 3551 | */ |
f91de92e N |
3552 | if (_IOC_TYPE(cmd) == MD_MAJOR && |
3553 | mddev->ro && mddev->pers) { | |
3554 | if (mddev->ro == 2) { | |
3555 | mddev->ro = 0; | |
3556 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3557 | md_wakeup_thread(mddev->thread); | |
3558 | ||
3559 | } else { | |
3560 | err = -EROFS; | |
3561 | goto abort_unlock; | |
3562 | } | |
1da177e4 LT |
3563 | } |
3564 | ||
3565 | switch (cmd) | |
3566 | { | |
3567 | case ADD_NEW_DISK: | |
3568 | { | |
3569 | mdu_disk_info_t info; | |
3570 | if (copy_from_user(&info, argp, sizeof(info))) | |
3571 | err = -EFAULT; | |
3572 | else | |
3573 | err = add_new_disk(mddev, &info); | |
3574 | goto done_unlock; | |
3575 | } | |
3576 | ||
3577 | case HOT_REMOVE_DISK: | |
3578 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3579 | goto done_unlock; | |
3580 | ||
3581 | case HOT_ADD_DISK: | |
3582 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3583 | goto done_unlock; | |
3584 | ||
3585 | case SET_DISK_FAULTY: | |
3586 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3587 | goto done_unlock; | |
3588 | ||
3589 | case RUN_ARRAY: | |
3590 | err = do_md_run (mddev); | |
3591 | goto done_unlock; | |
3592 | ||
32a7627c N |
3593 | case SET_BITMAP_FILE: |
3594 | err = set_bitmap_file(mddev, (int)arg); | |
3595 | goto done_unlock; | |
3596 | ||
1da177e4 LT |
3597 | default: |
3598 | if (_IOC_TYPE(cmd) == MD_MAJOR) | |
3599 | printk(KERN_WARNING "md: %s(pid %d) used" | |
3600 | " obsolete MD ioctl, upgrade your" | |
3601 | " software to use new ictls.\n", | |
3602 | current->comm, current->pid); | |
3603 | err = -EINVAL; | |
3604 | goto abort_unlock; | |
3605 | } | |
3606 | ||
3607 | done_unlock: | |
3608 | abort_unlock: | |
3609 | mddev_unlock(mddev); | |
3610 | ||
3611 | return err; | |
3612 | done: | |
3613 | if (err) | |
3614 | MD_BUG(); | |
3615 | abort: | |
3616 | return err; | |
3617 | } | |
3618 | ||
3619 | static int md_open(struct inode *inode, struct file *file) | |
3620 | { | |
3621 | /* | |
3622 | * Succeed if we can lock the mddev, which confirms that | |
3623 | * it isn't being stopped right now. | |
3624 | */ | |
3625 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3626 | int err; | |
3627 | ||
3628 | if ((err = mddev_lock(mddev))) | |
3629 | goto out; | |
3630 | ||
3631 | err = 0; | |
3632 | mddev_get(mddev); | |
3633 | mddev_unlock(mddev); | |
3634 | ||
3635 | check_disk_change(inode->i_bdev); | |
3636 | out: | |
3637 | return err; | |
3638 | } | |
3639 | ||
3640 | static int md_release(struct inode *inode, struct file * file) | |
3641 | { | |
3642 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3643 | ||
3644 | if (!mddev) | |
3645 | BUG(); | |
3646 | mddev_put(mddev); | |
3647 | ||
3648 | return 0; | |
3649 | } | |
3650 | ||
3651 | static int md_media_changed(struct gendisk *disk) | |
3652 | { | |
3653 | mddev_t *mddev = disk->private_data; | |
3654 | ||
3655 | return mddev->changed; | |
3656 | } | |
3657 | ||
3658 | static int md_revalidate(struct gendisk *disk) | |
3659 | { | |
3660 | mddev_t *mddev = disk->private_data; | |
3661 | ||
3662 | mddev->changed = 0; | |
3663 | return 0; | |
3664 | } | |
3665 | static struct block_device_operations md_fops = | |
3666 | { | |
3667 | .owner = THIS_MODULE, | |
3668 | .open = md_open, | |
3669 | .release = md_release, | |
3670 | .ioctl = md_ioctl, | |
3671 | .media_changed = md_media_changed, | |
3672 | .revalidate_disk= md_revalidate, | |
3673 | }; | |
3674 | ||
75c96f85 | 3675 | static int md_thread(void * arg) |
1da177e4 LT |
3676 | { |
3677 | mdk_thread_t *thread = arg; | |
3678 | ||
1da177e4 LT |
3679 | /* |
3680 | * md_thread is a 'system-thread', it's priority should be very | |
3681 | * high. We avoid resource deadlocks individually in each | |
3682 | * raid personality. (RAID5 does preallocation) We also use RR and | |
3683 | * the very same RT priority as kswapd, thus we will never get | |
3684 | * into a priority inversion deadlock. | |
3685 | * | |
3686 | * we definitely have to have equal or higher priority than | |
3687 | * bdflush, otherwise bdflush will deadlock if there are too | |
3688 | * many dirty RAID5 blocks. | |
3689 | */ | |
1da177e4 | 3690 | |
6985c43f | 3691 | allow_signal(SIGKILL); |
a6fb0934 | 3692 | while (!kthread_should_stop()) { |
1da177e4 | 3693 | |
93588e22 N |
3694 | /* We need to wait INTERRUPTIBLE so that |
3695 | * we don't add to the load-average. | |
3696 | * That means we need to be sure no signals are | |
3697 | * pending | |
3698 | */ | |
3699 | if (signal_pending(current)) | |
3700 | flush_signals(current); | |
3701 | ||
3702 | wait_event_interruptible_timeout | |
3703 | (thread->wqueue, | |
3704 | test_bit(THREAD_WAKEUP, &thread->flags) | |
3705 | || kthread_should_stop(), | |
3706 | thread->timeout); | |
3e1d1d28 | 3707 | try_to_freeze(); |
1da177e4 LT |
3708 | |
3709 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
3710 | ||
787453c2 | 3711 | thread->run(thread->mddev); |
1da177e4 | 3712 | } |
a6fb0934 | 3713 | |
1da177e4 LT |
3714 | return 0; |
3715 | } | |
3716 | ||
3717 | void md_wakeup_thread(mdk_thread_t *thread) | |
3718 | { | |
3719 | if (thread) { | |
3720 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
3721 | set_bit(THREAD_WAKEUP, &thread->flags); | |
3722 | wake_up(&thread->wqueue); | |
3723 | } | |
3724 | } | |
3725 | ||
3726 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
3727 | const char *name) | |
3728 | { | |
3729 | mdk_thread_t *thread; | |
1da177e4 | 3730 | |
9ffae0cf | 3731 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
3732 | if (!thread) |
3733 | return NULL; | |
3734 | ||
1da177e4 LT |
3735 | init_waitqueue_head(&thread->wqueue); |
3736 | ||
1da177e4 LT |
3737 | thread->run = run; |
3738 | thread->mddev = mddev; | |
32a7627c | 3739 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 3740 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 3741 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
3742 | kfree(thread); |
3743 | return NULL; | |
3744 | } | |
1da177e4 LT |
3745 | return thread; |
3746 | } | |
3747 | ||
1da177e4 LT |
3748 | void md_unregister_thread(mdk_thread_t *thread) |
3749 | { | |
d28446fe | 3750 | dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); |
a6fb0934 N |
3751 | |
3752 | kthread_stop(thread->tsk); | |
1da177e4 LT |
3753 | kfree(thread); |
3754 | } | |
3755 | ||
3756 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
3757 | { | |
3758 | if (!mddev) { | |
3759 | MD_BUG(); | |
3760 | return; | |
3761 | } | |
3762 | ||
b2d444d7 | 3763 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3764 | return; |
32a7627c | 3765 | /* |
1da177e4 LT |
3766 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
3767 | mdname(mddev), | |
3768 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
3769 | __builtin_return_address(0),__builtin_return_address(1), | |
3770 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 3771 | */ |
1da177e4 LT |
3772 | if (!mddev->pers->error_handler) |
3773 | return; | |
3774 | mddev->pers->error_handler(mddev,rdev); | |
3775 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3776 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3777 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 3778 | md_new_event(mddev); |
1da177e4 LT |
3779 | } |
3780 | ||
3781 | /* seq_file implementation /proc/mdstat */ | |
3782 | ||
3783 | static void status_unused(struct seq_file *seq) | |
3784 | { | |
3785 | int i = 0; | |
3786 | mdk_rdev_t *rdev; | |
3787 | struct list_head *tmp; | |
3788 | ||
3789 | seq_printf(seq, "unused devices: "); | |
3790 | ||
3791 | ITERATE_RDEV_PENDING(rdev,tmp) { | |
3792 | char b[BDEVNAME_SIZE]; | |
3793 | i++; | |
3794 | seq_printf(seq, "%s ", | |
3795 | bdevname(rdev->bdev,b)); | |
3796 | } | |
3797 | if (!i) | |
3798 | seq_printf(seq, "<none>"); | |
3799 | ||
3800 | seq_printf(seq, "\n"); | |
3801 | } | |
3802 | ||
3803 | ||
3804 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
3805 | { | |
3806 | unsigned long max_blocks, resync, res, dt, db, rt; | |
3807 | ||
3808 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
3809 | ||
3810 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3811 | max_blocks = mddev->resync_max_sectors >> 1; | |
3812 | else | |
3813 | max_blocks = mddev->size; | |
3814 | ||
3815 | /* | |
3816 | * Should not happen. | |
3817 | */ | |
3818 | if (!max_blocks) { | |
3819 | MD_BUG(); | |
3820 | return; | |
3821 | } | |
3822 | res = (resync/1024)*1000/(max_blocks/1024 + 1); | |
3823 | { | |
3824 | int i, x = res/50, y = 20-x; | |
3825 | seq_printf(seq, "["); | |
3826 | for (i = 0; i < x; i++) | |
3827 | seq_printf(seq, "="); | |
3828 | seq_printf(seq, ">"); | |
3829 | for (i = 0; i < y; i++) | |
3830 | seq_printf(seq, "."); | |
3831 | seq_printf(seq, "] "); | |
3832 | } | |
3833 | seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", | |
3834 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
3835 | "resync" : "recovery"), | |
3836 | res/10, res % 10, resync, max_blocks); | |
3837 | ||
3838 | /* | |
3839 | * We do not want to overflow, so the order of operands and | |
3840 | * the * 100 / 100 trick are important. We do a +1 to be | |
3841 | * safe against division by zero. We only estimate anyway. | |
3842 | * | |
3843 | * dt: time from mark until now | |
3844 | * db: blocks written from mark until now | |
3845 | * rt: remaining time | |
3846 | */ | |
3847 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
3848 | if (!dt) dt++; | |
3849 | db = resync - (mddev->resync_mark_cnt/2); | |
3850 | rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; | |
3851 | ||
3852 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
3853 | ||
3854 | seq_printf(seq, " speed=%ldK/sec", db/dt); | |
3855 | } | |
3856 | ||
3857 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
3858 | { | |
3859 | struct list_head *tmp; | |
3860 | loff_t l = *pos; | |
3861 | mddev_t *mddev; | |
3862 | ||
3863 | if (l >= 0x10000) | |
3864 | return NULL; | |
3865 | if (!l--) | |
3866 | /* header */ | |
3867 | return (void*)1; | |
3868 | ||
3869 | spin_lock(&all_mddevs_lock); | |
3870 | list_for_each(tmp,&all_mddevs) | |
3871 | if (!l--) { | |
3872 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
3873 | mddev_get(mddev); | |
3874 | spin_unlock(&all_mddevs_lock); | |
3875 | return mddev; | |
3876 | } | |
3877 | spin_unlock(&all_mddevs_lock); | |
3878 | if (!l--) | |
3879 | return (void*)2;/* tail */ | |
3880 | return NULL; | |
3881 | } | |
3882 | ||
3883 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3884 | { | |
3885 | struct list_head *tmp; | |
3886 | mddev_t *next_mddev, *mddev = v; | |
3887 | ||
3888 | ++*pos; | |
3889 | if (v == (void*)2) | |
3890 | return NULL; | |
3891 | ||
3892 | spin_lock(&all_mddevs_lock); | |
3893 | if (v == (void*)1) | |
3894 | tmp = all_mddevs.next; | |
3895 | else | |
3896 | tmp = mddev->all_mddevs.next; | |
3897 | if (tmp != &all_mddevs) | |
3898 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
3899 | else { | |
3900 | next_mddev = (void*)2; | |
3901 | *pos = 0x10000; | |
3902 | } | |
3903 | spin_unlock(&all_mddevs_lock); | |
3904 | ||
3905 | if (v != (void*)1) | |
3906 | mddev_put(mddev); | |
3907 | return next_mddev; | |
3908 | ||
3909 | } | |
3910 | ||
3911 | static void md_seq_stop(struct seq_file *seq, void *v) | |
3912 | { | |
3913 | mddev_t *mddev = v; | |
3914 | ||
3915 | if (mddev && v != (void*)1 && v != (void*)2) | |
3916 | mddev_put(mddev); | |
3917 | } | |
3918 | ||
d7603b7e N |
3919 | struct mdstat_info { |
3920 | int event; | |
3921 | }; | |
3922 | ||
1da177e4 LT |
3923 | static int md_seq_show(struct seq_file *seq, void *v) |
3924 | { | |
3925 | mddev_t *mddev = v; | |
3926 | sector_t size; | |
3927 | struct list_head *tmp2; | |
3928 | mdk_rdev_t *rdev; | |
d7603b7e | 3929 | struct mdstat_info *mi = seq->private; |
32a7627c | 3930 | struct bitmap *bitmap; |
1da177e4 LT |
3931 | |
3932 | if (v == (void*)1) { | |
2604b703 | 3933 | struct mdk_personality *pers; |
1da177e4 LT |
3934 | seq_printf(seq, "Personalities : "); |
3935 | spin_lock(&pers_lock); | |
2604b703 N |
3936 | list_for_each_entry(pers, &pers_list, list) |
3937 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
3938 | |
3939 | spin_unlock(&pers_lock); | |
3940 | seq_printf(seq, "\n"); | |
d7603b7e | 3941 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
3942 | return 0; |
3943 | } | |
3944 | if (v == (void*)2) { | |
3945 | status_unused(seq); | |
3946 | return 0; | |
3947 | } | |
3948 | ||
3949 | if (mddev_lock(mddev)!=0) | |
3950 | return -EINTR; | |
3951 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { | |
3952 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
3953 | mddev->pers ? "" : "in"); | |
3954 | if (mddev->pers) { | |
f91de92e | 3955 | if (mddev->ro==1) |
1da177e4 | 3956 | seq_printf(seq, " (read-only)"); |
f91de92e N |
3957 | if (mddev->ro==2) |
3958 | seq_printf(seq, "(auto-read-only)"); | |
1da177e4 LT |
3959 | seq_printf(seq, " %s", mddev->pers->name); |
3960 | } | |
3961 | ||
3962 | size = 0; | |
3963 | ITERATE_RDEV(mddev,rdev,tmp2) { | |
3964 | char b[BDEVNAME_SIZE]; | |
3965 | seq_printf(seq, " %s[%d]", | |
3966 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
3967 | if (test_bit(WriteMostly, &rdev->flags)) |
3968 | seq_printf(seq, "(W)"); | |
b2d444d7 | 3969 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
3970 | seq_printf(seq, "(F)"); |
3971 | continue; | |
b325a32e N |
3972 | } else if (rdev->raid_disk < 0) |
3973 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
3974 | size += rdev->size; |
3975 | } | |
3976 | ||
3977 | if (!list_empty(&mddev->disks)) { | |
3978 | if (mddev->pers) | |
3979 | seq_printf(seq, "\n %llu blocks", | |
3980 | (unsigned long long)mddev->array_size); | |
3981 | else | |
3982 | seq_printf(seq, "\n %llu blocks", | |
3983 | (unsigned long long)size); | |
3984 | } | |
1cd6bf19 N |
3985 | if (mddev->persistent) { |
3986 | if (mddev->major_version != 0 || | |
3987 | mddev->minor_version != 90) { | |
3988 | seq_printf(seq," super %d.%d", | |
3989 | mddev->major_version, | |
3990 | mddev->minor_version); | |
3991 | } | |
3992 | } else | |
3993 | seq_printf(seq, " super non-persistent"); | |
1da177e4 LT |
3994 | |
3995 | if (mddev->pers) { | |
3996 | mddev->pers->status (seq, mddev); | |
3997 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
3998 | if (mddev->pers->sync_request) { |
3999 | if (mddev->curr_resync > 2) { | |
4000 | status_resync (seq, mddev); | |
4001 | seq_printf(seq, "\n "); | |
4002 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
4003 | seq_printf(seq, "\tresync=DELAYED\n "); | |
4004 | else if (mddev->recovery_cp < MaxSector) | |
4005 | seq_printf(seq, "\tresync=PENDING\n "); | |
4006 | } | |
32a7627c N |
4007 | } else |
4008 | seq_printf(seq, "\n "); | |
4009 | ||
4010 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
4011 | unsigned long chunk_kb; |
4012 | unsigned long flags; | |
32a7627c N |
4013 | spin_lock_irqsave(&bitmap->lock, flags); |
4014 | chunk_kb = bitmap->chunksize >> 10; | |
4015 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
4016 | "%lu%s chunk", | |
4017 | bitmap->pages - bitmap->missing_pages, | |
4018 | bitmap->pages, | |
4019 | (bitmap->pages - bitmap->missing_pages) | |
4020 | << (PAGE_SHIFT - 10), | |
4021 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
4022 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
4023 | if (bitmap->file) { |
4024 | seq_printf(seq, ", file: "); | |
4025 | seq_path(seq, bitmap->file->f_vfsmnt, | |
4026 | bitmap->file->f_dentry," \t\n"); | |
32a7627c | 4027 | } |
78d742d8 | 4028 | |
32a7627c N |
4029 | seq_printf(seq, "\n"); |
4030 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
4031 | } |
4032 | ||
4033 | seq_printf(seq, "\n"); | |
4034 | } | |
4035 | mddev_unlock(mddev); | |
4036 | ||
4037 | return 0; | |
4038 | } | |
4039 | ||
4040 | static struct seq_operations md_seq_ops = { | |
4041 | .start = md_seq_start, | |
4042 | .next = md_seq_next, | |
4043 | .stop = md_seq_stop, | |
4044 | .show = md_seq_show, | |
4045 | }; | |
4046 | ||
4047 | static int md_seq_open(struct inode *inode, struct file *file) | |
4048 | { | |
4049 | int error; | |
d7603b7e N |
4050 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
4051 | if (mi == NULL) | |
4052 | return -ENOMEM; | |
1da177e4 LT |
4053 | |
4054 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
4055 | if (error) |
4056 | kfree(mi); | |
4057 | else { | |
4058 | struct seq_file *p = file->private_data; | |
4059 | p->private = mi; | |
4060 | mi->event = atomic_read(&md_event_count); | |
4061 | } | |
1da177e4 LT |
4062 | return error; |
4063 | } | |
4064 | ||
d7603b7e N |
4065 | static int md_seq_release(struct inode *inode, struct file *file) |
4066 | { | |
4067 | struct seq_file *m = file->private_data; | |
4068 | struct mdstat_info *mi = m->private; | |
4069 | m->private = NULL; | |
4070 | kfree(mi); | |
4071 | return seq_release(inode, file); | |
4072 | } | |
4073 | ||
4074 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) | |
4075 | { | |
4076 | struct seq_file *m = filp->private_data; | |
4077 | struct mdstat_info *mi = m->private; | |
4078 | int mask; | |
4079 | ||
4080 | poll_wait(filp, &md_event_waiters, wait); | |
4081 | ||
4082 | /* always allow read */ | |
4083 | mask = POLLIN | POLLRDNORM; | |
4084 | ||
4085 | if (mi->event != atomic_read(&md_event_count)) | |
4086 | mask |= POLLERR | POLLPRI; | |
4087 | return mask; | |
4088 | } | |
4089 | ||
1da177e4 LT |
4090 | static struct file_operations md_seq_fops = { |
4091 | .open = md_seq_open, | |
4092 | .read = seq_read, | |
4093 | .llseek = seq_lseek, | |
d7603b7e N |
4094 | .release = md_seq_release, |
4095 | .poll = mdstat_poll, | |
1da177e4 LT |
4096 | }; |
4097 | ||
2604b703 | 4098 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 4099 | { |
1da177e4 | 4100 | spin_lock(&pers_lock); |
2604b703 N |
4101 | list_add_tail(&p->list, &pers_list); |
4102 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
4103 | spin_unlock(&pers_lock); |
4104 | return 0; | |
4105 | } | |
4106 | ||
2604b703 | 4107 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 4108 | { |
2604b703 | 4109 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 4110 | spin_lock(&pers_lock); |
2604b703 | 4111 | list_del_init(&p->list); |
1da177e4 LT |
4112 | spin_unlock(&pers_lock); |
4113 | return 0; | |
4114 | } | |
4115 | ||
4116 | static int is_mddev_idle(mddev_t *mddev) | |
4117 | { | |
4118 | mdk_rdev_t * rdev; | |
4119 | struct list_head *tmp; | |
4120 | int idle; | |
4121 | unsigned long curr_events; | |
4122 | ||
4123 | idle = 1; | |
4124 | ITERATE_RDEV(mddev,rdev,tmp) { | |
4125 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
a362357b JA |
4126 | curr_events = disk_stat_read(disk, sectors[0]) + |
4127 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 4128 | atomic_read(&disk->sync_io); |
c0e48521 N |
4129 | /* The difference between curr_events and last_events |
4130 | * will be affected by any new non-sync IO (making | |
4131 | * curr_events bigger) and any difference in the amount of | |
4132 | * in-flight syncio (making current_events bigger or smaller) | |
4133 | * The amount in-flight is currently limited to | |
4134 | * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6 | |
4135 | * which is at most 4096 sectors. | |
4136 | * These numbers are fairly fragile and should be made | |
4137 | * more robust, probably by enforcing the | |
4138 | * 'window size' that md_do_sync sort-of uses. | |
4139 | * | |
1da177e4 LT |
4140 | * Note: the following is an unsigned comparison. |
4141 | */ | |
c0e48521 | 4142 | if ((curr_events - rdev->last_events + 4096) > 8192) { |
1da177e4 LT |
4143 | rdev->last_events = curr_events; |
4144 | idle = 0; | |
4145 | } | |
4146 | } | |
4147 | return idle; | |
4148 | } | |
4149 | ||
4150 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
4151 | { | |
4152 | /* another "blocks" (512byte) blocks have been synced */ | |
4153 | atomic_sub(blocks, &mddev->recovery_active); | |
4154 | wake_up(&mddev->recovery_wait); | |
4155 | if (!ok) { | |
4156 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
4157 | md_wakeup_thread(mddev->thread); | |
4158 | // stop recovery, signal do_sync .... | |
4159 | } | |
4160 | } | |
4161 | ||
4162 | ||
06d91a5f N |
4163 | /* md_write_start(mddev, bi) |
4164 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
4165 | * in superblock) before writing, schedule a superblock update |
4166 | * and wait for it to complete. | |
06d91a5f | 4167 | */ |
3d310eb7 | 4168 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 4169 | { |
06d91a5f | 4170 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 4171 | return; |
06d91a5f | 4172 | |
f91de92e N |
4173 | BUG_ON(mddev->ro == 1); |
4174 | if (mddev->ro == 2) { | |
4175 | /* need to switch to read/write */ | |
4176 | mddev->ro = 0; | |
4177 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4178 | md_wakeup_thread(mddev->thread); | |
4179 | } | |
06d91a5f | 4180 | atomic_inc(&mddev->writes_pending); |
06d91a5f | 4181 | if (mddev->in_sync) { |
a9701a30 | 4182 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
4183 | if (mddev->in_sync) { |
4184 | mddev->in_sync = 0; | |
4185 | mddev->sb_dirty = 1; | |
4186 | md_wakeup_thread(mddev->thread); | |
4187 | } | |
a9701a30 | 4188 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 4189 | } |
3d310eb7 | 4190 | wait_event(mddev->sb_wait, mddev->sb_dirty==0); |
1da177e4 LT |
4191 | } |
4192 | ||
4193 | void md_write_end(mddev_t *mddev) | |
4194 | { | |
4195 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
4196 | if (mddev->safemode == 2) | |
4197 | md_wakeup_thread(mddev->thread); | |
4198 | else | |
4199 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); | |
4200 | } | |
4201 | } | |
4202 | ||
75c96f85 | 4203 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
4204 | |
4205 | #define SYNC_MARKS 10 | |
4206 | #define SYNC_MARK_STEP (3*HZ) | |
4207 | static void md_do_sync(mddev_t *mddev) | |
4208 | { | |
4209 | mddev_t *mddev2; | |
4210 | unsigned int currspeed = 0, | |
4211 | window; | |
57afd89f | 4212 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
4213 | unsigned long mark[SYNC_MARKS]; |
4214 | sector_t mark_cnt[SYNC_MARKS]; | |
4215 | int last_mark,m; | |
4216 | struct list_head *tmp; | |
4217 | sector_t last_check; | |
57afd89f | 4218 | int skipped = 0; |
1da177e4 LT |
4219 | |
4220 | /* just incase thread restarts... */ | |
4221 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
4222 | return; | |
4223 | ||
4224 | /* we overload curr_resync somewhat here. | |
4225 | * 0 == not engaged in resync at all | |
4226 | * 2 == checking that there is no conflict with another sync | |
4227 | * 1 == like 2, but have yielded to allow conflicting resync to | |
4228 | * commense | |
4229 | * other == active in resync - this many blocks | |
4230 | * | |
4231 | * Before starting a resync we must have set curr_resync to | |
4232 | * 2, and then checked that every "conflicting" array has curr_resync | |
4233 | * less than ours. When we find one that is the same or higher | |
4234 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
4235 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
4236 | * This will mean we have to start checking from the beginning again. | |
4237 | * | |
4238 | */ | |
4239 | ||
4240 | do { | |
4241 | mddev->curr_resync = 2; | |
4242 | ||
4243 | try_again: | |
787453c2 | 4244 | if (kthread_should_stop()) { |
6985c43f | 4245 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
4246 | goto skip; |
4247 | } | |
4248 | ITERATE_MDDEV(mddev2,tmp) { | |
1da177e4 LT |
4249 | if (mddev2 == mddev) |
4250 | continue; | |
4251 | if (mddev2->curr_resync && | |
4252 | match_mddev_units(mddev,mddev2)) { | |
4253 | DEFINE_WAIT(wq); | |
4254 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
4255 | /* arbitrarily yield */ | |
4256 | mddev->curr_resync = 1; | |
4257 | wake_up(&resync_wait); | |
4258 | } | |
4259 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
4260 | /* no need to wait here, we can wait the next | |
4261 | * time 'round when curr_resync == 2 | |
4262 | */ | |
4263 | continue; | |
787453c2 N |
4264 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
4265 | if (!kthread_should_stop() && | |
8712e553 | 4266 | mddev2->curr_resync >= mddev->curr_resync) { |
1da177e4 LT |
4267 | printk(KERN_INFO "md: delaying resync of %s" |
4268 | " until %s has finished resync (they" | |
4269 | " share one or more physical units)\n", | |
4270 | mdname(mddev), mdname(mddev2)); | |
4271 | mddev_put(mddev2); | |
4272 | schedule(); | |
4273 | finish_wait(&resync_wait, &wq); | |
4274 | goto try_again; | |
4275 | } | |
4276 | finish_wait(&resync_wait, &wq); | |
4277 | } | |
4278 | } | |
4279 | } while (mddev->curr_resync < 2); | |
4280 | ||
9d88883e | 4281 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 4282 | /* resync follows the size requested by the personality, |
57afd89f | 4283 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
4284 | */ |
4285 | max_sectors = mddev->resync_max_sectors; | |
9d88883e N |
4286 | mddev->resync_mismatches = 0; |
4287 | } else | |
1da177e4 LT |
4288 | /* recovery follows the physical size of devices */ |
4289 | max_sectors = mddev->size << 1; | |
4290 | ||
4291 | printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); | |
4292 | printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" | |
4293 | " %d KB/sec/disc.\n", sysctl_speed_limit_min); | |
338cec32 | 4294 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
1da177e4 LT |
4295 | "(but not more than %d KB/sec) for reconstruction.\n", |
4296 | sysctl_speed_limit_max); | |
4297 | ||
4298 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
32a7627c | 4299 | /* we don't use the checkpoint if there's a bitmap */ |
24dd469d N |
4300 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap |
4301 | && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1da177e4 LT |
4302 | j = mddev->recovery_cp; |
4303 | else | |
4304 | j = 0; | |
57afd89f | 4305 | io_sectors = 0; |
1da177e4 LT |
4306 | for (m = 0; m < SYNC_MARKS; m++) { |
4307 | mark[m] = jiffies; | |
57afd89f | 4308 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
4309 | } |
4310 | last_mark = 0; | |
4311 | mddev->resync_mark = mark[last_mark]; | |
4312 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
4313 | ||
4314 | /* | |
4315 | * Tune reconstruction: | |
4316 | */ | |
4317 | window = 32*(PAGE_SIZE/512); | |
4318 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
4319 | window/2,(unsigned long long) max_sectors/2); | |
4320 | ||
4321 | atomic_set(&mddev->recovery_active, 0); | |
4322 | init_waitqueue_head(&mddev->recovery_wait); | |
4323 | last_check = 0; | |
4324 | ||
4325 | if (j>2) { | |
4326 | printk(KERN_INFO | |
4327 | "md: resuming recovery of %s from checkpoint.\n", | |
4328 | mdname(mddev)); | |
4329 | mddev->curr_resync = j; | |
4330 | } | |
4331 | ||
4332 | while (j < max_sectors) { | |
57afd89f | 4333 | sector_t sectors; |
1da177e4 | 4334 | |
57afd89f N |
4335 | skipped = 0; |
4336 | sectors = mddev->pers->sync_request(mddev, j, &skipped, | |
4337 | currspeed < sysctl_speed_limit_min); | |
4338 | if (sectors == 0) { | |
1da177e4 LT |
4339 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
4340 | goto out; | |
4341 | } | |
57afd89f N |
4342 | |
4343 | if (!skipped) { /* actual IO requested */ | |
4344 | io_sectors += sectors; | |
4345 | atomic_add(sectors, &mddev->recovery_active); | |
4346 | } | |
4347 | ||
1da177e4 LT |
4348 | j += sectors; |
4349 | if (j>1) mddev->curr_resync = j; | |
d7603b7e N |
4350 | if (last_check == 0) |
4351 | /* this is the earliers that rebuilt will be | |
4352 | * visible in /proc/mdstat | |
4353 | */ | |
4354 | md_new_event(mddev); | |
57afd89f N |
4355 | |
4356 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
4357 | continue; |
4358 | ||
57afd89f | 4359 | last_check = io_sectors; |
1da177e4 LT |
4360 | |
4361 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
4362 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
4363 | break; | |
4364 | ||
4365 | repeat: | |
4366 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
4367 | /* step marks */ | |
4368 | int next = (last_mark+1) % SYNC_MARKS; | |
4369 | ||
4370 | mddev->resync_mark = mark[next]; | |
4371 | mddev->resync_mark_cnt = mark_cnt[next]; | |
4372 | mark[next] = jiffies; | |
57afd89f | 4373 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
4374 | last_mark = next; |
4375 | } | |
4376 | ||
4377 | ||
787453c2 | 4378 | if (kthread_should_stop()) { |
1da177e4 LT |
4379 | /* |
4380 | * got a signal, exit. | |
4381 | */ | |
4382 | printk(KERN_INFO | |
4383 | "md: md_do_sync() got signal ... exiting\n"); | |
1da177e4 LT |
4384 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4385 | goto out; | |
4386 | } | |
4387 | ||
4388 | /* | |
4389 | * this loop exits only if either when we are slower than | |
4390 | * the 'hard' speed limit, or the system was IO-idle for | |
4391 | * a jiffy. | |
4392 | * the system might be non-idle CPU-wise, but we only care | |
4393 | * about not overloading the IO subsystem. (things like an | |
4394 | * e2fsck being done on the RAID array should execute fast) | |
4395 | */ | |
4396 | mddev->queue->unplug_fn(mddev->queue); | |
4397 | cond_resched(); | |
4398 | ||
57afd89f N |
4399 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
4400 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 LT |
4401 | |
4402 | if (currspeed > sysctl_speed_limit_min) { | |
4403 | if ((currspeed > sysctl_speed_limit_max) || | |
4404 | !is_mddev_idle(mddev)) { | |
c0e48521 | 4405 | msleep(500); |
1da177e4 LT |
4406 | goto repeat; |
4407 | } | |
4408 | } | |
4409 | } | |
4410 | printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); | |
4411 | /* | |
4412 | * this also signals 'finished resyncing' to md_stop | |
4413 | */ | |
4414 | out: | |
4415 | mddev->queue->unplug_fn(mddev->queue); | |
4416 | ||
4417 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
4418 | ||
4419 | /* tell personality that we are finished */ | |
57afd89f | 4420 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
4421 | |
4422 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4423 | mddev->curr_resync > 2 && | |
4424 | mddev->curr_resync >= mddev->recovery_cp) { | |
4425 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4426 | printk(KERN_INFO | |
4427 | "md: checkpointing recovery of %s.\n", | |
4428 | mdname(mddev)); | |
4429 | mddev->recovery_cp = mddev->curr_resync; | |
4430 | } else | |
4431 | mddev->recovery_cp = MaxSector; | |
4432 | } | |
4433 | ||
1da177e4 LT |
4434 | skip: |
4435 | mddev->curr_resync = 0; | |
4436 | wake_up(&resync_wait); | |
4437 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
4438 | md_wakeup_thread(mddev->thread); | |
4439 | } | |
4440 | ||
4441 | ||
4442 | /* | |
4443 | * This routine is regularly called by all per-raid-array threads to | |
4444 | * deal with generic issues like resync and super-block update. | |
4445 | * Raid personalities that don't have a thread (linear/raid0) do not | |
4446 | * need this as they never do any recovery or update the superblock. | |
4447 | * | |
4448 | * It does not do any resync itself, but rather "forks" off other threads | |
4449 | * to do that as needed. | |
4450 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
4451 | * "->recovery" and create a thread at ->sync_thread. | |
4452 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
4453 | * and wakeups up this thread which will reap the thread and finish up. | |
4454 | * This thread also removes any faulty devices (with nr_pending == 0). | |
4455 | * | |
4456 | * The overall approach is: | |
4457 | * 1/ if the superblock needs updating, update it. | |
4458 | * 2/ If a recovery thread is running, don't do anything else. | |
4459 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
4460 | * 4/ If there are any faulty devices, remove them. | |
4461 | * 5/ If array is degraded, try to add spares devices | |
4462 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
4463 | */ | |
4464 | void md_check_recovery(mddev_t *mddev) | |
4465 | { | |
4466 | mdk_rdev_t *rdev; | |
4467 | struct list_head *rtmp; | |
4468 | ||
4469 | ||
5f40402d N |
4470 | if (mddev->bitmap) |
4471 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
4472 | |
4473 | if (mddev->ro) | |
4474 | return; | |
fca4d848 N |
4475 | |
4476 | if (signal_pending(current)) { | |
4477 | if (mddev->pers->sync_request) { | |
4478 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
4479 | mdname(mddev)); | |
4480 | mddev->safemode = 2; | |
4481 | } | |
4482 | flush_signals(current); | |
4483 | } | |
4484 | ||
1da177e4 LT |
4485 | if ( ! ( |
4486 | mddev->sb_dirty || | |
4487 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || | |
fca4d848 N |
4488 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
4489 | (mddev->safemode == 1) || | |
4490 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
4491 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
4492 | )) |
4493 | return; | |
fca4d848 | 4494 | |
1da177e4 LT |
4495 | if (mddev_trylock(mddev)==0) { |
4496 | int spares =0; | |
fca4d848 | 4497 | |
a9701a30 | 4498 | spin_lock_irq(&mddev->write_lock); |
fca4d848 N |
4499 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
4500 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
4501 | mddev->in_sync = 1; | |
4502 | mddev->sb_dirty = 1; | |
4503 | } | |
4504 | if (mddev->safemode == 1) | |
4505 | mddev->safemode = 0; | |
a9701a30 | 4506 | spin_unlock_irq(&mddev->write_lock); |
fca4d848 | 4507 | |
1da177e4 LT |
4508 | if (mddev->sb_dirty) |
4509 | md_update_sb(mddev); | |
06d91a5f | 4510 | |
06d91a5f | 4511 | |
1da177e4 LT |
4512 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4513 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
4514 | /* resync/recovery still happening */ | |
4515 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4516 | goto unlock; | |
4517 | } | |
4518 | if (mddev->sync_thread) { | |
4519 | /* resync has finished, collect result */ | |
4520 | md_unregister_thread(mddev->sync_thread); | |
4521 | mddev->sync_thread = NULL; | |
4522 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4523 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4524 | /* success...*/ | |
4525 | /* activate any spares */ | |
4526 | mddev->pers->spare_active(mddev); | |
4527 | } | |
4528 | md_update_sb(mddev); | |
41158c7e N |
4529 | |
4530 | /* if array is no-longer degraded, then any saved_raid_disk | |
4531 | * information must be scrapped | |
4532 | */ | |
4533 | if (!mddev->degraded) | |
4534 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4535 | rdev->saved_raid_disk = -1; | |
4536 | ||
1da177e4 LT |
4537 | mddev->recovery = 0; |
4538 | /* flag recovery needed just to double check */ | |
4539 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
d7603b7e | 4540 | md_new_event(mddev); |
1da177e4 LT |
4541 | goto unlock; |
4542 | } | |
24dd469d N |
4543 | /* Clear some bits that don't mean anything, but |
4544 | * might be left set | |
4545 | */ | |
4546 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4547 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
4548 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4549 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 LT |
4550 | |
4551 | /* no recovery is running. | |
4552 | * remove any failed drives, then | |
4553 | * add spares if possible. | |
4554 | * Spare are also removed and re-added, to allow | |
4555 | * the personality to fail the re-add. | |
4556 | */ | |
4557 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4558 | if (rdev->raid_disk >= 0 && | |
b2d444d7 | 4559 | (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && |
1da177e4 | 4560 | atomic_read(&rdev->nr_pending)==0) { |
86e6ffdd N |
4561 | if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { |
4562 | char nm[20]; | |
4563 | sprintf(nm,"rd%d", rdev->raid_disk); | |
4564 | sysfs_remove_link(&mddev->kobj, nm); | |
1da177e4 | 4565 | rdev->raid_disk = -1; |
86e6ffdd | 4566 | } |
1da177e4 LT |
4567 | } |
4568 | ||
4569 | if (mddev->degraded) { | |
4570 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4571 | if (rdev->raid_disk < 0 | |
b2d444d7 | 4572 | && !test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
4573 | if (mddev->pers->hot_add_disk(mddev,rdev)) { |
4574 | char nm[20]; | |
4575 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4576 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
1da177e4 | 4577 | spares++; |
d7603b7e | 4578 | md_new_event(mddev); |
86e6ffdd | 4579 | } else |
1da177e4 LT |
4580 | break; |
4581 | } | |
4582 | } | |
4583 | ||
24dd469d N |
4584 | if (spares) { |
4585 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4586 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4587 | } else if (mddev->recovery_cp < MaxSector) { | |
4588 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4589 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4590 | /* nothing to be done ... */ | |
1da177e4 | 4591 | goto unlock; |
24dd469d | 4592 | |
1da177e4 LT |
4593 | if (mddev->pers->sync_request) { |
4594 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
4595 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
4596 | /* We are adding a device or devices to an array | |
4597 | * which has the bitmap stored on all devices. | |
4598 | * So make sure all bitmap pages get written | |
4599 | */ | |
4600 | bitmap_write_all(mddev->bitmap); | |
4601 | } | |
1da177e4 LT |
4602 | mddev->sync_thread = md_register_thread(md_do_sync, |
4603 | mddev, | |
4604 | "%s_resync"); | |
4605 | if (!mddev->sync_thread) { | |
4606 | printk(KERN_ERR "%s: could not start resync" | |
4607 | " thread...\n", | |
4608 | mdname(mddev)); | |
4609 | /* leave the spares where they are, it shouldn't hurt */ | |
4610 | mddev->recovery = 0; | |
d7603b7e | 4611 | } else |
1da177e4 | 4612 | md_wakeup_thread(mddev->sync_thread); |
d7603b7e | 4613 | md_new_event(mddev); |
1da177e4 LT |
4614 | } |
4615 | unlock: | |
4616 | mddev_unlock(mddev); | |
4617 | } | |
4618 | } | |
4619 | ||
75c96f85 AB |
4620 | static int md_notify_reboot(struct notifier_block *this, |
4621 | unsigned long code, void *x) | |
1da177e4 LT |
4622 | { |
4623 | struct list_head *tmp; | |
4624 | mddev_t *mddev; | |
4625 | ||
4626 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
4627 | ||
4628 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
4629 | ||
4630 | ITERATE_MDDEV(mddev,tmp) | |
4631 | if (mddev_trylock(mddev)==0) | |
4632 | do_md_stop (mddev, 1); | |
4633 | /* | |
4634 | * certain more exotic SCSI devices are known to be | |
4635 | * volatile wrt too early system reboots. While the | |
4636 | * right place to handle this issue is the given | |
4637 | * driver, we do want to have a safe RAID driver ... | |
4638 | */ | |
4639 | mdelay(1000*1); | |
4640 | } | |
4641 | return NOTIFY_DONE; | |
4642 | } | |
4643 | ||
75c96f85 | 4644 | static struct notifier_block md_notifier = { |
1da177e4 LT |
4645 | .notifier_call = md_notify_reboot, |
4646 | .next = NULL, | |
4647 | .priority = INT_MAX, /* before any real devices */ | |
4648 | }; | |
4649 | ||
4650 | static void md_geninit(void) | |
4651 | { | |
4652 | struct proc_dir_entry *p; | |
4653 | ||
4654 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
4655 | ||
4656 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
4657 | if (p) | |
4658 | p->proc_fops = &md_seq_fops; | |
4659 | } | |
4660 | ||
75c96f85 | 4661 | static int __init md_init(void) |
1da177e4 LT |
4662 | { |
4663 | int minor; | |
4664 | ||
4665 | printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," | |
4666 | " MD_SB_DISKS=%d\n", | |
4667 | MD_MAJOR_VERSION, MD_MINOR_VERSION, | |
4668 | MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); | |
bd926c63 | 4669 | printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, |
32a7627c | 4670 | BITMAP_MINOR); |
1da177e4 LT |
4671 | |
4672 | if (register_blkdev(MAJOR_NR, "md")) | |
4673 | return -1; | |
4674 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
4675 | unregister_blkdev(MAJOR_NR, "md"); | |
4676 | return -1; | |
4677 | } | |
4678 | devfs_mk_dir("md"); | |
4679 | blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, | |
4680 | md_probe, NULL, NULL); | |
4681 | blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, | |
4682 | md_probe, NULL, NULL); | |
4683 | ||
4684 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4685 | devfs_mk_bdev(MKDEV(MAJOR_NR, minor), | |
4686 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4687 | "md/%d", minor); | |
4688 | ||
4689 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4690 | devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), | |
4691 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4692 | "md/mdp%d", minor); | |
4693 | ||
4694 | ||
4695 | register_reboot_notifier(&md_notifier); | |
4696 | raid_table_header = register_sysctl_table(raid_root_table, 1); | |
4697 | ||
4698 | md_geninit(); | |
4699 | return (0); | |
4700 | } | |
4701 | ||
4702 | ||
4703 | #ifndef MODULE | |
4704 | ||
4705 | /* | |
4706 | * Searches all registered partitions for autorun RAID arrays | |
4707 | * at boot time. | |
4708 | */ | |
4709 | static dev_t detected_devices[128]; | |
4710 | static int dev_cnt; | |
4711 | ||
4712 | void md_autodetect_dev(dev_t dev) | |
4713 | { | |
4714 | if (dev_cnt >= 0 && dev_cnt < 127) | |
4715 | detected_devices[dev_cnt++] = dev; | |
4716 | } | |
4717 | ||
4718 | ||
4719 | static void autostart_arrays(int part) | |
4720 | { | |
4721 | mdk_rdev_t *rdev; | |
4722 | int i; | |
4723 | ||
4724 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); | |
4725 | ||
4726 | for (i = 0; i < dev_cnt; i++) { | |
4727 | dev_t dev = detected_devices[i]; | |
4728 | ||
4729 | rdev = md_import_device(dev,0, 0); | |
4730 | if (IS_ERR(rdev)) | |
4731 | continue; | |
4732 | ||
b2d444d7 | 4733 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4734 | MD_BUG(); |
4735 | continue; | |
4736 | } | |
4737 | list_add(&rdev->same_set, &pending_raid_disks); | |
4738 | } | |
4739 | dev_cnt = 0; | |
4740 | ||
4741 | autorun_devices(part); | |
4742 | } | |
4743 | ||
4744 | #endif | |
4745 | ||
4746 | static __exit void md_exit(void) | |
4747 | { | |
4748 | mddev_t *mddev; | |
4749 | struct list_head *tmp; | |
4750 | int i; | |
4751 | blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); | |
4752 | blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); | |
4753 | for (i=0; i < MAX_MD_DEVS; i++) | |
4754 | devfs_remove("md/%d", i); | |
4755 | for (i=0; i < MAX_MD_DEVS; i++) | |
4756 | devfs_remove("md/d%d", i); | |
4757 | ||
4758 | devfs_remove("md"); | |
4759 | ||
4760 | unregister_blkdev(MAJOR_NR,"md"); | |
4761 | unregister_blkdev(mdp_major, "mdp"); | |
4762 | unregister_reboot_notifier(&md_notifier); | |
4763 | unregister_sysctl_table(raid_table_header); | |
4764 | remove_proc_entry("mdstat", NULL); | |
4765 | ITERATE_MDDEV(mddev,tmp) { | |
4766 | struct gendisk *disk = mddev->gendisk; | |
4767 | if (!disk) | |
4768 | continue; | |
4769 | export_array(mddev); | |
4770 | del_gendisk(disk); | |
4771 | put_disk(disk); | |
4772 | mddev->gendisk = NULL; | |
4773 | mddev_put(mddev); | |
4774 | } | |
4775 | } | |
4776 | ||
4777 | module_init(md_init) | |
4778 | module_exit(md_exit) | |
4779 | ||
f91de92e N |
4780 | static int get_ro(char *buffer, struct kernel_param *kp) |
4781 | { | |
4782 | return sprintf(buffer, "%d", start_readonly); | |
4783 | } | |
4784 | static int set_ro(const char *val, struct kernel_param *kp) | |
4785 | { | |
4786 | char *e; | |
4787 | int num = simple_strtoul(val, &e, 10); | |
4788 | if (*val && (*e == '\0' || *e == '\n')) { | |
4789 | start_readonly = num; | |
4dbcdc75 | 4790 | return 0; |
f91de92e N |
4791 | } |
4792 | return -EINVAL; | |
4793 | } | |
4794 | ||
4795 | module_param_call(start_ro, set_ro, get_ro, NULL, 0600); | |
6ff8d8ec N |
4796 | module_param(start_dirty_degraded, int, 0644); |
4797 | ||
f91de92e | 4798 | |
1da177e4 LT |
4799 | EXPORT_SYMBOL(register_md_personality); |
4800 | EXPORT_SYMBOL(unregister_md_personality); | |
4801 | EXPORT_SYMBOL(md_error); | |
4802 | EXPORT_SYMBOL(md_done_sync); | |
4803 | EXPORT_SYMBOL(md_write_start); | |
4804 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
4805 | EXPORT_SYMBOL(md_register_thread); |
4806 | EXPORT_SYMBOL(md_unregister_thread); | |
4807 | EXPORT_SYMBOL(md_wakeup_thread); | |
4808 | EXPORT_SYMBOL(md_print_devices); | |
4809 | EXPORT_SYMBOL(md_check_recovery); | |
4810 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 4811 | MODULE_ALIAS("md"); |
72008652 | 4812 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |