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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> | |
45 | ||
46 | #include <linux/init.h> | |
47 | ||
32a7627c N |
48 | #include <linux/file.h> |
49 | ||
1da177e4 LT |
50 | #ifdef CONFIG_KMOD |
51 | #include <linux/kmod.h> | |
52 | #endif | |
53 | ||
54 | #include <asm/unaligned.h> | |
55 | ||
56 | #define MAJOR_NR MD_MAJOR | |
57 | #define MD_DRIVER | |
58 | ||
59 | /* 63 partitions with the alternate major number (mdp) */ | |
60 | #define MdpMinorShift 6 | |
61 | ||
62 | #define DEBUG 0 | |
63 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
64 | ||
65 | ||
66 | #ifndef MODULE | |
67 | static void autostart_arrays (int part); | |
68 | #endif | |
69 | ||
70 | static mdk_personality_t *pers[MAX_PERSONALITY]; | |
71 | static DEFINE_SPINLOCK(pers_lock); | |
72 | ||
73 | /* | |
74 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
75 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
76 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 77 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
78 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
79 | * speed limit - in case reconstruction slows down your system despite | |
80 | * idle IO detection. | |
81 | * | |
82 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
83 | */ | |
84 | ||
85 | static int sysctl_speed_limit_min = 1000; | |
86 | static int sysctl_speed_limit_max = 200000; | |
87 | ||
88 | static struct ctl_table_header *raid_table_header; | |
89 | ||
90 | static ctl_table raid_table[] = { | |
91 | { | |
92 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
93 | .procname = "speed_limit_min", | |
94 | .data = &sysctl_speed_limit_min, | |
95 | .maxlen = sizeof(int), | |
96 | .mode = 0644, | |
97 | .proc_handler = &proc_dointvec, | |
98 | }, | |
99 | { | |
100 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
101 | .procname = "speed_limit_max", | |
102 | .data = &sysctl_speed_limit_max, | |
103 | .maxlen = sizeof(int), | |
104 | .mode = 0644, | |
105 | .proc_handler = &proc_dointvec, | |
106 | }, | |
107 | { .ctl_name = 0 } | |
108 | }; | |
109 | ||
110 | static ctl_table raid_dir_table[] = { | |
111 | { | |
112 | .ctl_name = DEV_RAID, | |
113 | .procname = "raid", | |
114 | .maxlen = 0, | |
115 | .mode = 0555, | |
116 | .child = raid_table, | |
117 | }, | |
118 | { .ctl_name = 0 } | |
119 | }; | |
120 | ||
121 | static ctl_table raid_root_table[] = { | |
122 | { | |
123 | .ctl_name = CTL_DEV, | |
124 | .procname = "dev", | |
125 | .maxlen = 0, | |
126 | .mode = 0555, | |
127 | .child = raid_dir_table, | |
128 | }, | |
129 | { .ctl_name = 0 } | |
130 | }; | |
131 | ||
132 | static struct block_device_operations md_fops; | |
133 | ||
f91de92e N |
134 | static int start_readonly; |
135 | ||
1da177e4 LT |
136 | /* |
137 | * Enables to iterate over all existing md arrays | |
138 | * all_mddevs_lock protects this list. | |
139 | */ | |
140 | static LIST_HEAD(all_mddevs); | |
141 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
142 | ||
143 | ||
144 | /* | |
145 | * iterates through all used mddevs in the system. | |
146 | * We take care to grab the all_mddevs_lock whenever navigating | |
147 | * the list, and to always hold a refcount when unlocked. | |
148 | * Any code which breaks out of this loop while own | |
149 | * a reference to the current mddev and must mddev_put it. | |
150 | */ | |
151 | #define ITERATE_MDDEV(mddev,tmp) \ | |
152 | \ | |
153 | for (({ spin_lock(&all_mddevs_lock); \ | |
154 | tmp = all_mddevs.next; \ | |
155 | mddev = NULL;}); \ | |
156 | ({ if (tmp != &all_mddevs) \ | |
157 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
158 | spin_unlock(&all_mddevs_lock); \ | |
159 | if (mddev) mddev_put(mddev); \ | |
160 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
161 | tmp != &all_mddevs;}); \ | |
162 | ({ spin_lock(&all_mddevs_lock); \ | |
163 | tmp = tmp->next;}) \ | |
164 | ) | |
165 | ||
166 | ||
167 | static int md_fail_request (request_queue_t *q, struct bio *bio) | |
168 | { | |
169 | bio_io_error(bio, bio->bi_size); | |
170 | return 0; | |
171 | } | |
172 | ||
173 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
174 | { | |
175 | atomic_inc(&mddev->active); | |
176 | return mddev; | |
177 | } | |
178 | ||
179 | static void mddev_put(mddev_t *mddev) | |
180 | { | |
181 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
182 | return; | |
183 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
184 | list_del(&mddev->all_mddevs); | |
185 | blk_put_queue(mddev->queue); | |
eae1701f | 186 | kobject_unregister(&mddev->kobj); |
1da177e4 LT |
187 | } |
188 | spin_unlock(&all_mddevs_lock); | |
189 | } | |
190 | ||
191 | static mddev_t * mddev_find(dev_t unit) | |
192 | { | |
193 | mddev_t *mddev, *new = NULL; | |
194 | ||
195 | retry: | |
196 | spin_lock(&all_mddevs_lock); | |
197 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
198 | if (mddev->unit == unit) { | |
199 | mddev_get(mddev); | |
200 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 201 | kfree(new); |
1da177e4 LT |
202 | return mddev; |
203 | } | |
204 | ||
205 | if (new) { | |
206 | list_add(&new->all_mddevs, &all_mddevs); | |
207 | spin_unlock(&all_mddevs_lock); | |
208 | return new; | |
209 | } | |
210 | spin_unlock(&all_mddevs_lock); | |
211 | ||
212 | new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL); | |
213 | if (!new) | |
214 | return NULL; | |
215 | ||
216 | memset(new, 0, sizeof(*new)); | |
217 | ||
218 | new->unit = unit; | |
219 | if (MAJOR(unit) == MD_MAJOR) | |
220 | new->md_minor = MINOR(unit); | |
221 | else | |
222 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
223 | ||
224 | init_MUTEX(&new->reconfig_sem); | |
225 | INIT_LIST_HEAD(&new->disks); | |
226 | INIT_LIST_HEAD(&new->all_mddevs); | |
227 | init_timer(&new->safemode_timer); | |
228 | atomic_set(&new->active, 1); | |
06d91a5f | 229 | spin_lock_init(&new->write_lock); |
3d310eb7 | 230 | init_waitqueue_head(&new->sb_wait); |
1da177e4 LT |
231 | |
232 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
233 | if (!new->queue) { | |
234 | kfree(new); | |
235 | return NULL; | |
236 | } | |
237 | ||
238 | blk_queue_make_request(new->queue, md_fail_request); | |
239 | ||
240 | goto retry; | |
241 | } | |
242 | ||
243 | static inline int mddev_lock(mddev_t * mddev) | |
244 | { | |
245 | return down_interruptible(&mddev->reconfig_sem); | |
246 | } | |
247 | ||
248 | static inline void mddev_lock_uninterruptible(mddev_t * mddev) | |
249 | { | |
250 | down(&mddev->reconfig_sem); | |
251 | } | |
252 | ||
253 | static inline int mddev_trylock(mddev_t * mddev) | |
254 | { | |
255 | return down_trylock(&mddev->reconfig_sem); | |
256 | } | |
257 | ||
258 | static inline void mddev_unlock(mddev_t * mddev) | |
259 | { | |
260 | up(&mddev->reconfig_sem); | |
261 | ||
005eca5e | 262 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
263 | } |
264 | ||
265 | mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) | |
266 | { | |
267 | mdk_rdev_t * rdev; | |
268 | struct list_head *tmp; | |
269 | ||
270 | ITERATE_RDEV(mddev,rdev,tmp) { | |
271 | if (rdev->desc_nr == nr) | |
272 | return rdev; | |
273 | } | |
274 | return NULL; | |
275 | } | |
276 | ||
277 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
278 | { | |
279 | struct list_head *tmp; | |
280 | mdk_rdev_t *rdev; | |
281 | ||
282 | ITERATE_RDEV(mddev,rdev,tmp) { | |
283 | if (rdev->bdev->bd_dev == dev) | |
284 | return rdev; | |
285 | } | |
286 | return NULL; | |
287 | } | |
288 | ||
77933d72 | 289 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 LT |
290 | { |
291 | sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
292 | return MD_NEW_SIZE_BLOCKS(size); | |
293 | } | |
294 | ||
295 | static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) | |
296 | { | |
297 | sector_t size; | |
298 | ||
299 | size = rdev->sb_offset; | |
300 | ||
301 | if (chunk_size) | |
302 | size &= ~((sector_t)chunk_size/1024 - 1); | |
303 | return size; | |
304 | } | |
305 | ||
306 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
307 | { | |
308 | if (rdev->sb_page) | |
309 | MD_BUG(); | |
310 | ||
311 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
312 | if (!rdev->sb_page) { | |
313 | printk(KERN_ALERT "md: out of memory.\n"); | |
314 | return -EINVAL; | |
315 | } | |
316 | ||
317 | return 0; | |
318 | } | |
319 | ||
320 | static void free_disk_sb(mdk_rdev_t * rdev) | |
321 | { | |
322 | if (rdev->sb_page) { | |
323 | page_cache_release(rdev->sb_page); | |
324 | rdev->sb_loaded = 0; | |
325 | rdev->sb_page = NULL; | |
326 | rdev->sb_offset = 0; | |
327 | rdev->size = 0; | |
328 | } | |
329 | } | |
330 | ||
331 | ||
7bfa19f2 N |
332 | static int super_written(struct bio *bio, unsigned int bytes_done, int error) |
333 | { | |
334 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 335 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 N |
336 | if (bio->bi_size) |
337 | return 1; | |
338 | ||
339 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
a9701a30 | 340 | md_error(mddev, rdev); |
7bfa19f2 | 341 | |
a9701a30 N |
342 | if (atomic_dec_and_test(&mddev->pending_writes)) |
343 | wake_up(&mddev->sb_wait); | |
f8b58edf | 344 | bio_put(bio); |
7bfa19f2 N |
345 | return 0; |
346 | } | |
347 | ||
a9701a30 N |
348 | static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) |
349 | { | |
350 | struct bio *bio2 = bio->bi_private; | |
351 | mdk_rdev_t *rdev = bio2->bi_private; | |
352 | mddev_t *mddev = rdev->mddev; | |
353 | if (bio->bi_size) | |
354 | return 1; | |
355 | ||
356 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
357 | error == -EOPNOTSUPP) { | |
358 | unsigned long flags; | |
359 | /* barriers don't appear to be supported :-( */ | |
360 | set_bit(BarriersNotsupp, &rdev->flags); | |
361 | mddev->barriers_work = 0; | |
362 | spin_lock_irqsave(&mddev->write_lock, flags); | |
363 | bio2->bi_next = mddev->biolist; | |
364 | mddev->biolist = bio2; | |
365 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
366 | wake_up(&mddev->sb_wait); | |
367 | bio_put(bio); | |
368 | return 0; | |
369 | } | |
370 | bio_put(bio2); | |
371 | bio->bi_private = rdev; | |
372 | return super_written(bio, bytes_done, error); | |
373 | } | |
374 | ||
7bfa19f2 N |
375 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
376 | sector_t sector, int size, struct page *page) | |
377 | { | |
378 | /* write first size bytes of page to sector of rdev | |
379 | * Increment mddev->pending_writes before returning | |
380 | * and decrement it on completion, waking up sb_wait | |
381 | * if zero is reached. | |
382 | * If an error occurred, call md_error | |
a9701a30 N |
383 | * |
384 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
385 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
386 | */ |
387 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 388 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
389 | |
390 | bio->bi_bdev = rdev->bdev; | |
391 | bio->bi_sector = sector; | |
392 | bio_add_page(bio, page, size, 0); | |
393 | bio->bi_private = rdev; | |
394 | bio->bi_end_io = super_written; | |
a9701a30 N |
395 | bio->bi_rw = rw; |
396 | ||
7bfa19f2 | 397 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
398 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
399 | struct bio *rbio; | |
400 | rw |= (1<<BIO_RW_BARRIER); | |
401 | rbio = bio_clone(bio, GFP_NOIO); | |
402 | rbio->bi_private = bio; | |
403 | rbio->bi_end_io = super_written_barrier; | |
404 | submit_bio(rw, rbio); | |
405 | } else | |
406 | submit_bio(rw, bio); | |
407 | } | |
408 | ||
409 | void md_super_wait(mddev_t *mddev) | |
410 | { | |
411 | /* wait for all superblock writes that were scheduled to complete. | |
412 | * if any had to be retried (due to BARRIER problems), retry them | |
413 | */ | |
414 | DEFINE_WAIT(wq); | |
415 | for(;;) { | |
416 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
417 | if (atomic_read(&mddev->pending_writes)==0) | |
418 | break; | |
419 | while (mddev->biolist) { | |
420 | struct bio *bio; | |
421 | spin_lock_irq(&mddev->write_lock); | |
422 | bio = mddev->biolist; | |
423 | mddev->biolist = bio->bi_next ; | |
424 | bio->bi_next = NULL; | |
425 | spin_unlock_irq(&mddev->write_lock); | |
426 | submit_bio(bio->bi_rw, bio); | |
427 | } | |
428 | schedule(); | |
429 | } | |
430 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
431 | } |
432 | ||
1da177e4 LT |
433 | static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) |
434 | { | |
435 | if (bio->bi_size) | |
436 | return 1; | |
437 | ||
438 | complete((struct completion*)bio->bi_private); | |
439 | return 0; | |
440 | } | |
441 | ||
a654b9d8 | 442 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
443 | struct page *page, int rw) |
444 | { | |
baaa2c51 | 445 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
446 | struct completion event; |
447 | int ret; | |
448 | ||
449 | rw |= (1 << BIO_RW_SYNC); | |
450 | ||
451 | bio->bi_bdev = bdev; | |
452 | bio->bi_sector = sector; | |
453 | bio_add_page(bio, page, size, 0); | |
454 | init_completion(&event); | |
455 | bio->bi_private = &event; | |
456 | bio->bi_end_io = bi_complete; | |
457 | submit_bio(rw, bio); | |
458 | wait_for_completion(&event); | |
459 | ||
460 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
461 | bio_put(bio); | |
462 | return ret; | |
463 | } | |
464 | ||
0002b271 | 465 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
466 | { |
467 | char b[BDEVNAME_SIZE]; | |
468 | if (!rdev->sb_page) { | |
469 | MD_BUG(); | |
470 | return -EINVAL; | |
471 | } | |
472 | if (rdev->sb_loaded) | |
473 | return 0; | |
474 | ||
475 | ||
0002b271 | 476 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
477 | goto fail; |
478 | rdev->sb_loaded = 1; | |
479 | return 0; | |
480 | ||
481 | fail: | |
482 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
483 | bdevname(rdev->bdev,b)); | |
484 | return -EINVAL; | |
485 | } | |
486 | ||
487 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
488 | { | |
489 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
490 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
491 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
492 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
493 | ||
494 | return 1; | |
495 | ||
496 | return 0; | |
497 | } | |
498 | ||
499 | ||
500 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
501 | { | |
502 | int ret; | |
503 | mdp_super_t *tmp1, *tmp2; | |
504 | ||
505 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
506 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
507 | ||
508 | if (!tmp1 || !tmp2) { | |
509 | ret = 0; | |
510 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
511 | goto abort; | |
512 | } | |
513 | ||
514 | *tmp1 = *sb1; | |
515 | *tmp2 = *sb2; | |
516 | ||
517 | /* | |
518 | * nr_disks is not constant | |
519 | */ | |
520 | tmp1->nr_disks = 0; | |
521 | tmp2->nr_disks = 0; | |
522 | ||
523 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
524 | ret = 0; | |
525 | else | |
526 | ret = 1; | |
527 | ||
528 | abort: | |
990a8baf JJ |
529 | kfree(tmp1); |
530 | kfree(tmp2); | |
1da177e4 LT |
531 | return ret; |
532 | } | |
533 | ||
534 | static unsigned int calc_sb_csum(mdp_super_t * sb) | |
535 | { | |
536 | unsigned int disk_csum, csum; | |
537 | ||
538 | disk_csum = sb->sb_csum; | |
539 | sb->sb_csum = 0; | |
540 | csum = csum_partial((void *)sb, MD_SB_BYTES, 0); | |
541 | sb->sb_csum = disk_csum; | |
542 | return csum; | |
543 | } | |
544 | ||
545 | ||
546 | /* | |
547 | * Handle superblock details. | |
548 | * We want to be able to handle multiple superblock formats | |
549 | * so we have a common interface to them all, and an array of | |
550 | * different handlers. | |
551 | * We rely on user-space to write the initial superblock, and support | |
552 | * reading and updating of superblocks. | |
553 | * Interface methods are: | |
554 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
555 | * loads and validates a superblock on dev. | |
556 | * if refdev != NULL, compare superblocks on both devices | |
557 | * Return: | |
558 | * 0 - dev has a superblock that is compatible with refdev | |
559 | * 1 - dev has a superblock that is compatible and newer than refdev | |
560 | * so dev should be used as the refdev in future | |
561 | * -EINVAL superblock incompatible or invalid | |
562 | * -othererror e.g. -EIO | |
563 | * | |
564 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
565 | * Verify that dev is acceptable into mddev. | |
566 | * The first time, mddev->raid_disks will be 0, and data from | |
567 | * dev should be merged in. Subsequent calls check that dev | |
568 | * is new enough. Return 0 or -EINVAL | |
569 | * | |
570 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
571 | * Update the superblock for rdev with data in mddev | |
572 | * This does not write to disc. | |
573 | * | |
574 | */ | |
575 | ||
576 | struct super_type { | |
577 | char *name; | |
578 | struct module *owner; | |
579 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
580 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
581 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
582 | }; | |
583 | ||
584 | /* | |
585 | * load_super for 0.90.0 | |
586 | */ | |
587 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
588 | { | |
589 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
590 | mdp_super_t *sb; | |
591 | int ret; | |
592 | sector_t sb_offset; | |
593 | ||
594 | /* | |
595 | * Calculate the position of the superblock, | |
596 | * it's at the end of the disk. | |
597 | * | |
598 | * It also happens to be a multiple of 4Kb. | |
599 | */ | |
600 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
601 | rdev->sb_offset = sb_offset; | |
602 | ||
0002b271 | 603 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
604 | if (ret) return ret; |
605 | ||
606 | ret = -EINVAL; | |
607 | ||
608 | bdevname(rdev->bdev, b); | |
609 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
610 | ||
611 | if (sb->md_magic != MD_SB_MAGIC) { | |
612 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
613 | b); | |
614 | goto abort; | |
615 | } | |
616 | ||
617 | if (sb->major_version != 0 || | |
618 | sb->minor_version != 90) { | |
619 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", | |
620 | sb->major_version, sb->minor_version, | |
621 | b); | |
622 | goto abort; | |
623 | } | |
624 | ||
625 | if (sb->raid_disks <= 0) | |
626 | goto abort; | |
627 | ||
628 | if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) { | |
629 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", | |
630 | b); | |
631 | goto abort; | |
632 | } | |
633 | ||
634 | rdev->preferred_minor = sb->md_minor; | |
635 | rdev->data_offset = 0; | |
0002b271 | 636 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
637 | |
638 | if (sb->level == LEVEL_MULTIPATH) | |
639 | rdev->desc_nr = -1; | |
640 | else | |
641 | rdev->desc_nr = sb->this_disk.number; | |
642 | ||
643 | if (refdev == 0) | |
644 | ret = 1; | |
645 | else { | |
646 | __u64 ev1, ev2; | |
647 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
648 | if (!uuid_equal(refsb, sb)) { | |
649 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
650 | b, bdevname(refdev->bdev,b2)); | |
651 | goto abort; | |
652 | } | |
653 | if (!sb_equal(refsb, sb)) { | |
654 | printk(KERN_WARNING "md: %s has same UUID" | |
655 | " but different superblock to %s\n", | |
656 | b, bdevname(refdev->bdev, b2)); | |
657 | goto abort; | |
658 | } | |
659 | ev1 = md_event(sb); | |
660 | ev2 = md_event(refsb); | |
661 | if (ev1 > ev2) | |
662 | ret = 1; | |
663 | else | |
664 | ret = 0; | |
665 | } | |
666 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
667 | ||
668 | abort: | |
669 | return ret; | |
670 | } | |
671 | ||
672 | /* | |
673 | * validate_super for 0.90.0 | |
674 | */ | |
675 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
676 | { | |
677 | mdp_disk_t *desc; | |
678 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
679 | ||
41158c7e | 680 | rdev->raid_disk = -1; |
b2d444d7 | 681 | rdev->flags = 0; |
1da177e4 LT |
682 | if (mddev->raid_disks == 0) { |
683 | mddev->major_version = 0; | |
684 | mddev->minor_version = sb->minor_version; | |
685 | mddev->patch_version = sb->patch_version; | |
686 | mddev->persistent = ! sb->not_persistent; | |
687 | mddev->chunk_size = sb->chunk_size; | |
688 | mddev->ctime = sb->ctime; | |
689 | mddev->utime = sb->utime; | |
690 | mddev->level = sb->level; | |
691 | mddev->layout = sb->layout; | |
692 | mddev->raid_disks = sb->raid_disks; | |
693 | mddev->size = sb->size; | |
694 | mddev->events = md_event(sb); | |
9223214e | 695 | mddev->bitmap_offset = 0; |
36fa3063 | 696 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 LT |
697 | |
698 | if (sb->state & (1<<MD_SB_CLEAN)) | |
699 | mddev->recovery_cp = MaxSector; | |
700 | else { | |
701 | if (sb->events_hi == sb->cp_events_hi && | |
702 | sb->events_lo == sb->cp_events_lo) { | |
703 | mddev->recovery_cp = sb->recovery_cp; | |
704 | } else | |
705 | mddev->recovery_cp = 0; | |
706 | } | |
707 | ||
708 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
709 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
710 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
711 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
712 | ||
713 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
714 | |
715 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
716 | mddev->bitmap_file == NULL) { | |
934ce7c8 | 717 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6) { |
a654b9d8 N |
718 | /* FIXME use a better test */ |
719 | printk(KERN_WARNING "md: bitmaps only support for raid1\n"); | |
720 | return -EINVAL; | |
721 | } | |
36fa3063 | 722 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 N |
723 | } |
724 | ||
41158c7e N |
725 | } else if (mddev->pers == NULL) { |
726 | /* Insist on good event counter while assembling */ | |
727 | __u64 ev1 = md_event(sb); | |
1da177e4 LT |
728 | ++ev1; |
729 | if (ev1 < mddev->events) | |
730 | return -EINVAL; | |
41158c7e N |
731 | } else if (mddev->bitmap) { |
732 | /* if adding to array with a bitmap, then we can accept an | |
733 | * older device ... but not too old. | |
734 | */ | |
735 | __u64 ev1 = md_event(sb); | |
736 | if (ev1 < mddev->bitmap->events_cleared) | |
737 | return 0; | |
738 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
739 | return 0; | |
740 | ||
1da177e4 | 741 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
742 | desc = sb->disks + rdev->desc_nr; |
743 | ||
744 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 745 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
746 | else if (desc->state & (1<<MD_DISK_SYNC) && |
747 | desc->raid_disk < mddev->raid_disks) { | |
b2d444d7 | 748 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
749 | rdev->raid_disk = desc->raid_disk; |
750 | } | |
8ddf9efe N |
751 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
752 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 753 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 754 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
755 | return 0; |
756 | } | |
757 | ||
758 | /* | |
759 | * sync_super for 0.90.0 | |
760 | */ | |
761 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
762 | { | |
763 | mdp_super_t *sb; | |
764 | struct list_head *tmp; | |
765 | mdk_rdev_t *rdev2; | |
766 | int next_spare = mddev->raid_disks; | |
19133a42 | 767 | |
1da177e4 LT |
768 | |
769 | /* make rdev->sb match mddev data.. | |
770 | * | |
771 | * 1/ zero out disks | |
772 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
773 | * 3/ any empty disks < next_spare become removed | |
774 | * | |
775 | * disks[0] gets initialised to REMOVED because | |
776 | * we cannot be sure from other fields if it has | |
777 | * been initialised or not. | |
778 | */ | |
779 | int i; | |
780 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
781 | ||
61181565 N |
782 | rdev->sb_size = MD_SB_BYTES; |
783 | ||
1da177e4 LT |
784 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
785 | ||
786 | memset(sb, 0, sizeof(*sb)); | |
787 | ||
788 | sb->md_magic = MD_SB_MAGIC; | |
789 | sb->major_version = mddev->major_version; | |
790 | sb->minor_version = mddev->minor_version; | |
791 | sb->patch_version = mddev->patch_version; | |
792 | sb->gvalid_words = 0; /* ignored */ | |
793 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
794 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
795 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
796 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
797 | ||
798 | sb->ctime = mddev->ctime; | |
799 | sb->level = mddev->level; | |
800 | sb->size = mddev->size; | |
801 | sb->raid_disks = mddev->raid_disks; | |
802 | sb->md_minor = mddev->md_minor; | |
803 | sb->not_persistent = !mddev->persistent; | |
804 | sb->utime = mddev->utime; | |
805 | sb->state = 0; | |
806 | sb->events_hi = (mddev->events>>32); | |
807 | sb->events_lo = (u32)mddev->events; | |
808 | ||
809 | if (mddev->in_sync) | |
810 | { | |
811 | sb->recovery_cp = mddev->recovery_cp; | |
812 | sb->cp_events_hi = (mddev->events>>32); | |
813 | sb->cp_events_lo = (u32)mddev->events; | |
814 | if (mddev->recovery_cp == MaxSector) | |
815 | sb->state = (1<< MD_SB_CLEAN); | |
816 | } else | |
817 | sb->recovery_cp = 0; | |
818 | ||
819 | sb->layout = mddev->layout; | |
820 | sb->chunk_size = mddev->chunk_size; | |
821 | ||
a654b9d8 N |
822 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
823 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
824 | ||
1da177e4 LT |
825 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
826 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
827 | mdp_disk_t *d; | |
86e6ffdd | 828 | int desc_nr; |
b2d444d7 N |
829 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
830 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 831 | desc_nr = rdev2->raid_disk; |
1da177e4 | 832 | else |
86e6ffdd | 833 | desc_nr = next_spare++; |
19133a42 | 834 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
835 | d = &sb->disks[rdev2->desc_nr]; |
836 | nr_disks++; | |
837 | d->number = rdev2->desc_nr; | |
838 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
839 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
840 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
841 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
842 | d->raid_disk = rdev2->raid_disk; |
843 | else | |
844 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
b2d444d7 | 845 | if (test_bit(Faulty, &rdev2->flags)) { |
1da177e4 LT |
846 | d->state = (1<<MD_DISK_FAULTY); |
847 | failed++; | |
b2d444d7 | 848 | } else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
849 | d->state = (1<<MD_DISK_ACTIVE); |
850 | d->state |= (1<<MD_DISK_SYNC); | |
851 | active++; | |
852 | working++; | |
853 | } else { | |
854 | d->state = 0; | |
855 | spare++; | |
856 | working++; | |
857 | } | |
8ddf9efe N |
858 | if (test_bit(WriteMostly, &rdev2->flags)) |
859 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 860 | } |
1da177e4 LT |
861 | /* now set the "removed" and "faulty" bits on any missing devices */ |
862 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
863 | mdp_disk_t *d = &sb->disks[i]; | |
864 | if (d->state == 0 && d->number == 0) { | |
865 | d->number = i; | |
866 | d->raid_disk = i; | |
867 | d->state = (1<<MD_DISK_REMOVED); | |
868 | d->state |= (1<<MD_DISK_FAULTY); | |
869 | failed++; | |
870 | } | |
871 | } | |
872 | sb->nr_disks = nr_disks; | |
873 | sb->active_disks = active; | |
874 | sb->working_disks = working; | |
875 | sb->failed_disks = failed; | |
876 | sb->spare_disks = spare; | |
877 | ||
878 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
879 | sb->sb_csum = calc_sb_csum(sb); | |
880 | } | |
881 | ||
882 | /* | |
883 | * version 1 superblock | |
884 | */ | |
885 | ||
886 | static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) | |
887 | { | |
888 | unsigned int disk_csum, csum; | |
889 | unsigned long long newcsum; | |
890 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
891 | unsigned int *isuper = (unsigned int*)sb; | |
892 | int i; | |
893 | ||
894 | disk_csum = sb->sb_csum; | |
895 | sb->sb_csum = 0; | |
896 | newcsum = 0; | |
897 | for (i=0; size>=4; size -= 4 ) | |
898 | newcsum += le32_to_cpu(*isuper++); | |
899 | ||
900 | if (size == 2) | |
901 | newcsum += le16_to_cpu(*(unsigned short*) isuper); | |
902 | ||
903 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
904 | sb->sb_csum = disk_csum; | |
905 | return cpu_to_le32(csum); | |
906 | } | |
907 | ||
908 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
909 | { | |
910 | struct mdp_superblock_1 *sb; | |
911 | int ret; | |
912 | sector_t sb_offset; | |
913 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 914 | int bmask; |
1da177e4 LT |
915 | |
916 | /* | |
917 | * Calculate the position of the superblock. | |
918 | * It is always aligned to a 4K boundary and | |
919 | * depeding on minor_version, it can be: | |
920 | * 0: At least 8K, but less than 12K, from end of device | |
921 | * 1: At start of device | |
922 | * 2: 4K from start of device. | |
923 | */ | |
924 | switch(minor_version) { | |
925 | case 0: | |
926 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
927 | sb_offset -= 8*2; | |
39730960 | 928 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
929 | /* convert from sectors to K */ |
930 | sb_offset /= 2; | |
931 | break; | |
932 | case 1: | |
933 | sb_offset = 0; | |
934 | break; | |
935 | case 2: | |
936 | sb_offset = 4; | |
937 | break; | |
938 | default: | |
939 | return -EINVAL; | |
940 | } | |
941 | rdev->sb_offset = sb_offset; | |
942 | ||
0002b271 N |
943 | /* superblock is rarely larger than 1K, but it can be larger, |
944 | * and it is safe to read 4k, so we do that | |
945 | */ | |
946 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
947 | if (ret) return ret; |
948 | ||
949 | ||
950 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
951 | ||
952 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
953 | sb->major_version != cpu_to_le32(1) || | |
954 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
955 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 956 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
957 | return -EINVAL; |
958 | ||
959 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
960 | printk("md: invalid superblock checksum on %s\n", | |
961 | bdevname(rdev->bdev,b)); | |
962 | return -EINVAL; | |
963 | } | |
964 | if (le64_to_cpu(sb->data_size) < 10) { | |
965 | printk("md: data_size too small on %s\n", | |
966 | bdevname(rdev->bdev,b)); | |
967 | return -EINVAL; | |
968 | } | |
969 | rdev->preferred_minor = 0xffff; | |
970 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
971 | ||
0002b271 | 972 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 973 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 N |
974 | if (rdev->sb_size & bmask) |
975 | rdev-> sb_size = (rdev->sb_size | bmask)+1; | |
976 | ||
1da177e4 LT |
977 | if (refdev == 0) |
978 | return 1; | |
979 | else { | |
980 | __u64 ev1, ev2; | |
981 | struct mdp_superblock_1 *refsb = | |
982 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
983 | ||
984 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
985 | sb->level != refsb->level || | |
986 | sb->layout != refsb->layout || | |
987 | sb->chunksize != refsb->chunksize) { | |
988 | printk(KERN_WARNING "md: %s has strangely different" | |
989 | " superblock to %s\n", | |
990 | bdevname(rdev->bdev,b), | |
991 | bdevname(refdev->bdev,b2)); | |
992 | return -EINVAL; | |
993 | } | |
994 | ev1 = le64_to_cpu(sb->events); | |
995 | ev2 = le64_to_cpu(refsb->events); | |
996 | ||
997 | if (ev1 > ev2) | |
998 | return 1; | |
999 | } | |
1000 | if (minor_version) | |
1001 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; | |
1002 | else | |
1003 | rdev->size = rdev->sb_offset; | |
1004 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
1005 | return -EINVAL; | |
1006 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1007 | if (le32_to_cpu(sb->chunksize)) | |
1008 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
1009 | return 0; | |
1010 | } | |
1011 | ||
1012 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1013 | { | |
1014 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1015 | ||
41158c7e | 1016 | rdev->raid_disk = -1; |
b2d444d7 | 1017 | rdev->flags = 0; |
1da177e4 LT |
1018 | if (mddev->raid_disks == 0) { |
1019 | mddev->major_version = 1; | |
1020 | mddev->patch_version = 0; | |
1021 | mddev->persistent = 1; | |
1022 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; | |
1023 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1024 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1025 | mddev->level = le32_to_cpu(sb->level); | |
1026 | mddev->layout = le32_to_cpu(sb->layout); | |
1027 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1028 | mddev->size = le64_to_cpu(sb->size)/2; | |
1029 | mddev->events = le64_to_cpu(sb->events); | |
9223214e | 1030 | mddev->bitmap_offset = 0; |
53e87fbb | 1031 | mddev->default_bitmap_offset = 1024; |
1da177e4 LT |
1032 | |
1033 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1034 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1035 | ||
1036 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1037 | |
71c0805c | 1038 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
a654b9d8 N |
1039 | mddev->bitmap_file == NULL ) { |
1040 | if (mddev->level != 1) { | |
1041 | printk(KERN_WARNING "md: bitmaps only supported for raid1\n"); | |
1042 | return -EINVAL; | |
1043 | } | |
1044 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); | |
1045 | } | |
41158c7e N |
1046 | } else if (mddev->pers == NULL) { |
1047 | /* Insist of good event counter while assembling */ | |
1048 | __u64 ev1 = le64_to_cpu(sb->events); | |
1da177e4 LT |
1049 | ++ev1; |
1050 | if (ev1 < mddev->events) | |
1051 | return -EINVAL; | |
41158c7e N |
1052 | } else if (mddev->bitmap) { |
1053 | /* If adding to array with a bitmap, then we can accept an | |
1054 | * older device, but not too old. | |
1055 | */ | |
1056 | __u64 ev1 = le64_to_cpu(sb->events); | |
1057 | if (ev1 < mddev->bitmap->events_cleared) | |
1058 | return 0; | |
1059 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1060 | return 0; | |
1da177e4 LT |
1061 | |
1062 | if (mddev->level != LEVEL_MULTIPATH) { | |
1063 | int role; | |
1064 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1065 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1066 | switch(role) { | |
1067 | case 0xffff: /* spare */ | |
1da177e4 LT |
1068 | break; |
1069 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1070 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1071 | break; |
1072 | default: | |
b2d444d7 | 1073 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1074 | rdev->raid_disk = role; |
1075 | break; | |
1076 | } | |
8ddf9efe N |
1077 | if (sb->devflags & WriteMostly1) |
1078 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1079 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1080 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1081 | |
1da177e4 LT |
1082 | return 0; |
1083 | } | |
1084 | ||
1085 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1086 | { | |
1087 | struct mdp_superblock_1 *sb; | |
1088 | struct list_head *tmp; | |
1089 | mdk_rdev_t *rdev2; | |
1090 | int max_dev, i; | |
1091 | /* make rdev->sb match mddev and rdev data. */ | |
1092 | ||
1093 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1094 | ||
1095 | sb->feature_map = 0; | |
1096 | sb->pad0 = 0; | |
1097 | memset(sb->pad1, 0, sizeof(sb->pad1)); | |
1098 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1099 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1100 | ||
1101 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1102 | sb->events = cpu_to_le64(mddev->events); | |
1103 | if (mddev->in_sync) | |
1104 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1105 | else | |
1106 | sb->resync_offset = cpu_to_le64(0); | |
1107 | ||
a654b9d8 N |
1108 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1109 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1110 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 N |
1111 | } |
1112 | ||
1da177e4 LT |
1113 | max_dev = 0; |
1114 | ITERATE_RDEV(mddev,rdev2,tmp) | |
1115 | if (rdev2->desc_nr+1 > max_dev) | |
1116 | max_dev = rdev2->desc_nr+1; | |
1117 | ||
1118 | sb->max_dev = cpu_to_le32(max_dev); | |
1119 | for (i=0; i<max_dev;i++) | |
1120 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1121 | ||
1122 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
1123 | i = rdev2->desc_nr; | |
b2d444d7 | 1124 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1125 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1126 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 LT |
1127 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1128 | else | |
1129 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1130 | } | |
1131 | ||
1132 | sb->recovery_offset = cpu_to_le64(0); /* not supported yet */ | |
1133 | sb->sb_csum = calc_sb_1_csum(sb); | |
1134 | } | |
1135 | ||
1136 | ||
75c96f85 | 1137 | static struct super_type super_types[] = { |
1da177e4 LT |
1138 | [0] = { |
1139 | .name = "0.90.0", | |
1140 | .owner = THIS_MODULE, | |
1141 | .load_super = super_90_load, | |
1142 | .validate_super = super_90_validate, | |
1143 | .sync_super = super_90_sync, | |
1144 | }, | |
1145 | [1] = { | |
1146 | .name = "md-1", | |
1147 | .owner = THIS_MODULE, | |
1148 | .load_super = super_1_load, | |
1149 | .validate_super = super_1_validate, | |
1150 | .sync_super = super_1_sync, | |
1151 | }, | |
1152 | }; | |
1153 | ||
1154 | static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) | |
1155 | { | |
1156 | struct list_head *tmp; | |
1157 | mdk_rdev_t *rdev; | |
1158 | ||
1159 | ITERATE_RDEV(mddev,rdev,tmp) | |
1160 | if (rdev->bdev->bd_contains == dev->bdev->bd_contains) | |
1161 | return rdev; | |
1162 | ||
1163 | return NULL; | |
1164 | } | |
1165 | ||
1166 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1167 | { | |
1168 | struct list_head *tmp; | |
1169 | mdk_rdev_t *rdev; | |
1170 | ||
1171 | ITERATE_RDEV(mddev1,rdev,tmp) | |
1172 | if (match_dev_unit(mddev2, rdev)) | |
1173 | return 1; | |
1174 | ||
1175 | return 0; | |
1176 | } | |
1177 | ||
1178 | static LIST_HEAD(pending_raid_disks); | |
1179 | ||
1180 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1181 | { | |
1182 | mdk_rdev_t *same_pdev; | |
1183 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
f637b9f9 | 1184 | struct kobject *ko; |
1da177e4 LT |
1185 | |
1186 | if (rdev->mddev) { | |
1187 | MD_BUG(); | |
1188 | return -EINVAL; | |
1189 | } | |
1190 | same_pdev = match_dev_unit(mddev, rdev); | |
1191 | if (same_pdev) | |
1192 | printk(KERN_WARNING | |
1193 | "%s: WARNING: %s appears to be on the same physical" | |
1194 | " disk as %s. True\n protection against single-disk" | |
1195 | " failure might be compromised.\n", | |
1196 | mdname(mddev), bdevname(rdev->bdev,b), | |
1197 | bdevname(same_pdev->bdev,b2)); | |
1198 | ||
1199 | /* Verify rdev->desc_nr is unique. | |
1200 | * If it is -1, assign a free number, else | |
1201 | * check number is not in use | |
1202 | */ | |
1203 | if (rdev->desc_nr < 0) { | |
1204 | int choice = 0; | |
1205 | if (mddev->pers) choice = mddev->raid_disks; | |
1206 | while (find_rdev_nr(mddev, choice)) | |
1207 | choice++; | |
1208 | rdev->desc_nr = choice; | |
1209 | } else { | |
1210 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1211 | return -EBUSY; | |
1212 | } | |
19133a42 N |
1213 | bdevname(rdev->bdev,b); |
1214 | if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) | |
1215 | return -ENOMEM; | |
1da177e4 LT |
1216 | |
1217 | list_add(&rdev->same_set, &mddev->disks); | |
1218 | rdev->mddev = mddev; | |
19133a42 | 1219 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1220 | |
9c791977 | 1221 | rdev->kobj.parent = &mddev->kobj; |
86e6ffdd N |
1222 | kobject_add(&rdev->kobj); |
1223 | ||
f637b9f9 N |
1224 | if (rdev->bdev->bd_part) |
1225 | ko = &rdev->bdev->bd_part->kobj; | |
1226 | else | |
1227 | ko = &rdev->bdev->bd_disk->kobj; | |
1228 | sysfs_create_link(&rdev->kobj, ko, "block"); | |
1da177e4 LT |
1229 | return 0; |
1230 | } | |
1231 | ||
1232 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) | |
1233 | { | |
1234 | char b[BDEVNAME_SIZE]; | |
1235 | if (!rdev->mddev) { | |
1236 | MD_BUG(); | |
1237 | return; | |
1238 | } | |
1239 | list_del_init(&rdev->same_set); | |
1240 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1241 | rdev->mddev = NULL; | |
86e6ffdd N |
1242 | sysfs_remove_link(&rdev->kobj, "block"); |
1243 | kobject_del(&rdev->kobj); | |
1da177e4 LT |
1244 | } |
1245 | ||
1246 | /* | |
1247 | * prevent the device from being mounted, repartitioned or | |
1248 | * otherwise reused by a RAID array (or any other kernel | |
1249 | * subsystem), by bd_claiming the device. | |
1250 | */ | |
1251 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) | |
1252 | { | |
1253 | int err = 0; | |
1254 | struct block_device *bdev; | |
1255 | char b[BDEVNAME_SIZE]; | |
1256 | ||
1257 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
1258 | if (IS_ERR(bdev)) { | |
1259 | printk(KERN_ERR "md: could not open %s.\n", | |
1260 | __bdevname(dev, b)); | |
1261 | return PTR_ERR(bdev); | |
1262 | } | |
1263 | err = bd_claim(bdev, rdev); | |
1264 | if (err) { | |
1265 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1266 | bdevname(bdev, b)); | |
1267 | blkdev_put(bdev); | |
1268 | return err; | |
1269 | } | |
1270 | rdev->bdev = bdev; | |
1271 | return err; | |
1272 | } | |
1273 | ||
1274 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1275 | { | |
1276 | struct block_device *bdev = rdev->bdev; | |
1277 | rdev->bdev = NULL; | |
1278 | if (!bdev) | |
1279 | MD_BUG(); | |
1280 | bd_release(bdev); | |
1281 | blkdev_put(bdev); | |
1282 | } | |
1283 | ||
1284 | void md_autodetect_dev(dev_t dev); | |
1285 | ||
1286 | static void export_rdev(mdk_rdev_t * rdev) | |
1287 | { | |
1288 | char b[BDEVNAME_SIZE]; | |
1289 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1290 | bdevname(rdev->bdev,b)); | |
1291 | if (rdev->mddev) | |
1292 | MD_BUG(); | |
1293 | free_disk_sb(rdev); | |
1294 | list_del_init(&rdev->same_set); | |
1295 | #ifndef MODULE | |
1296 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1297 | #endif | |
1298 | unlock_rdev(rdev); | |
86e6ffdd | 1299 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1300 | } |
1301 | ||
1302 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1303 | { | |
1304 | unbind_rdev_from_array(rdev); | |
1305 | export_rdev(rdev); | |
1306 | } | |
1307 | ||
1308 | static void export_array(mddev_t *mddev) | |
1309 | { | |
1310 | struct list_head *tmp; | |
1311 | mdk_rdev_t *rdev; | |
1312 | ||
1313 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1314 | if (!rdev->mddev) { | |
1315 | MD_BUG(); | |
1316 | continue; | |
1317 | } | |
1318 | kick_rdev_from_array(rdev); | |
1319 | } | |
1320 | if (!list_empty(&mddev->disks)) | |
1321 | MD_BUG(); | |
1322 | mddev->raid_disks = 0; | |
1323 | mddev->major_version = 0; | |
1324 | } | |
1325 | ||
1326 | static void print_desc(mdp_disk_t *desc) | |
1327 | { | |
1328 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1329 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1330 | } | |
1331 | ||
1332 | static void print_sb(mdp_super_t *sb) | |
1333 | { | |
1334 | int i; | |
1335 | ||
1336 | printk(KERN_INFO | |
1337 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1338 | sb->major_version, sb->minor_version, sb->patch_version, | |
1339 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1340 | sb->ctime); | |
1341 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1342 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1343 | sb->md_minor, sb->layout, sb->chunk_size); | |
1344 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1345 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1346 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1347 | sb->failed_disks, sb->spare_disks, | |
1348 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1349 | ||
1350 | printk(KERN_INFO); | |
1351 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1352 | mdp_disk_t *desc; | |
1353 | ||
1354 | desc = sb->disks + i; | |
1355 | if (desc->number || desc->major || desc->minor || | |
1356 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1357 | printk(" D %2d: ", i); | |
1358 | print_desc(desc); | |
1359 | } | |
1360 | } | |
1361 | printk(KERN_INFO "md: THIS: "); | |
1362 | print_desc(&sb->this_disk); | |
1363 | ||
1364 | } | |
1365 | ||
1366 | static void print_rdev(mdk_rdev_t *rdev) | |
1367 | { | |
1368 | char b[BDEVNAME_SIZE]; | |
1369 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1370 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1371 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1372 | rdev->desc_nr); | |
1da177e4 LT |
1373 | if (rdev->sb_loaded) { |
1374 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1375 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1376 | } else | |
1377 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1378 | } | |
1379 | ||
1380 | void md_print_devices(void) | |
1381 | { | |
1382 | struct list_head *tmp, *tmp2; | |
1383 | mdk_rdev_t *rdev; | |
1384 | mddev_t *mddev; | |
1385 | char b[BDEVNAME_SIZE]; | |
1386 | ||
1387 | printk("\n"); | |
1388 | printk("md: **********************************\n"); | |
1389 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1390 | printk("md: **********************************\n"); | |
1391 | ITERATE_MDDEV(mddev,tmp) { | |
1da177e4 | 1392 | |
32a7627c N |
1393 | if (mddev->bitmap) |
1394 | bitmap_print_sb(mddev->bitmap); | |
1395 | else | |
1396 | printk("%s: ", mdname(mddev)); | |
1da177e4 LT |
1397 | ITERATE_RDEV(mddev,rdev,tmp2) |
1398 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1399 | printk("\n"); | |
1400 | ||
1401 | ITERATE_RDEV(mddev,rdev,tmp2) | |
1402 | print_rdev(rdev); | |
1403 | } | |
1404 | printk("md: **********************************\n"); | |
1405 | printk("\n"); | |
1406 | } | |
1407 | ||
1408 | ||
1da177e4 LT |
1409 | static void sync_sbs(mddev_t * mddev) |
1410 | { | |
1411 | mdk_rdev_t *rdev; | |
1412 | struct list_head *tmp; | |
1413 | ||
1414 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1415 | super_types[mddev->major_version]. | |
1416 | sync_super(mddev, rdev); | |
1417 | rdev->sb_loaded = 1; | |
1418 | } | |
1419 | } | |
1420 | ||
1421 | static void md_update_sb(mddev_t * mddev) | |
1422 | { | |
7bfa19f2 | 1423 | int err; |
1da177e4 LT |
1424 | struct list_head *tmp; |
1425 | mdk_rdev_t *rdev; | |
06d91a5f | 1426 | int sync_req; |
1da177e4 | 1427 | |
1da177e4 | 1428 | repeat: |
a9701a30 | 1429 | spin_lock_irq(&mddev->write_lock); |
06d91a5f | 1430 | sync_req = mddev->in_sync; |
1da177e4 LT |
1431 | mddev->utime = get_seconds(); |
1432 | mddev->events ++; | |
1433 | ||
1434 | if (!mddev->events) { | |
1435 | /* | |
1436 | * oops, this 64-bit counter should never wrap. | |
1437 | * Either we are in around ~1 trillion A.C., assuming | |
1438 | * 1 reboot per second, or we have a bug: | |
1439 | */ | |
1440 | MD_BUG(); | |
1441 | mddev->events --; | |
1442 | } | |
7bfa19f2 | 1443 | mddev->sb_dirty = 2; |
1da177e4 LT |
1444 | sync_sbs(mddev); |
1445 | ||
1446 | /* | |
1447 | * do not write anything to disk if using | |
1448 | * nonpersistent superblocks | |
1449 | */ | |
06d91a5f N |
1450 | if (!mddev->persistent) { |
1451 | mddev->sb_dirty = 0; | |
a9701a30 | 1452 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1453 | wake_up(&mddev->sb_wait); |
1da177e4 | 1454 | return; |
06d91a5f | 1455 | } |
a9701a30 | 1456 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1457 | |
1458 | dprintk(KERN_INFO | |
1459 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1460 | mdname(mddev),mddev->in_sync); | |
1461 | ||
32a7627c | 1462 | err = bitmap_update_sb(mddev->bitmap); |
1da177e4 LT |
1463 | ITERATE_RDEV(mddev,rdev,tmp) { |
1464 | char b[BDEVNAME_SIZE]; | |
1465 | dprintk(KERN_INFO "md: "); | |
b2d444d7 | 1466 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1467 | dprintk("(skipping faulty "); |
1468 | ||
1469 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1470 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1471 | md_super_write(mddev,rdev, |
0002b271 | 1472 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1473 | rdev->sb_page); |
1474 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1475 | bdevname(rdev->bdev,b), | |
1476 | (unsigned long long)rdev->sb_offset); | |
1477 | ||
1da177e4 LT |
1478 | } else |
1479 | dprintk(")\n"); | |
7bfa19f2 | 1480 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1481 | /* only need to write one superblock... */ |
1482 | break; | |
1483 | } | |
a9701a30 | 1484 | md_super_wait(mddev); |
7bfa19f2 N |
1485 | /* if there was a failure, sb_dirty was set to 1, and we re-write super */ |
1486 | ||
a9701a30 | 1487 | spin_lock_irq(&mddev->write_lock); |
7bfa19f2 | 1488 | if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { |
06d91a5f | 1489 | /* have to write it out again */ |
a9701a30 | 1490 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1491 | goto repeat; |
1492 | } | |
1493 | mddev->sb_dirty = 0; | |
a9701a30 | 1494 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1495 | wake_up(&mddev->sb_wait); |
06d91a5f | 1496 | |
1da177e4 LT |
1497 | } |
1498 | ||
86e6ffdd N |
1499 | struct rdev_sysfs_entry { |
1500 | struct attribute attr; | |
1501 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1502 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1503 | }; | |
1504 | ||
1505 | static ssize_t | |
96de1e66 | 1506 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1507 | { |
1508 | char *sep = ""; | |
1509 | int len=0; | |
1510 | ||
b2d444d7 | 1511 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1512 | len+= sprintf(page+len, "%sfaulty",sep); |
1513 | sep = ","; | |
1514 | } | |
b2d444d7 | 1515 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1516 | len += sprintf(page+len, "%sin_sync",sep); |
1517 | sep = ","; | |
1518 | } | |
b2d444d7 N |
1519 | if (!test_bit(Faulty, &rdev->flags) && |
1520 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1521 | len += sprintf(page+len, "%sspare", sep); |
1522 | sep = ","; | |
1523 | } | |
1524 | return len+sprintf(page+len, "\n"); | |
1525 | } | |
1526 | ||
96de1e66 N |
1527 | static struct rdev_sysfs_entry |
1528 | rdev_state = __ATTR_RO(state); | |
86e6ffdd N |
1529 | |
1530 | static ssize_t | |
96de1e66 | 1531 | super_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1532 | { |
1533 | if (rdev->sb_loaded && rdev->sb_size) { | |
1534 | memcpy(page, page_address(rdev->sb_page), rdev->sb_size); | |
1535 | return rdev->sb_size; | |
1536 | } else | |
1537 | return 0; | |
1538 | } | |
96de1e66 N |
1539 | static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); |
1540 | ||
86e6ffdd N |
1541 | static struct attribute *rdev_default_attrs[] = { |
1542 | &rdev_state.attr, | |
1543 | &rdev_super.attr, | |
1544 | NULL, | |
1545 | }; | |
1546 | static ssize_t | |
1547 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1548 | { | |
1549 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1550 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1551 | ||
1552 | if (!entry->show) | |
1553 | return -EIO; | |
1554 | return entry->show(rdev, page); | |
1555 | } | |
1556 | ||
1557 | static ssize_t | |
1558 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
1559 | const char *page, size_t length) | |
1560 | { | |
1561 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1562 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1563 | ||
1564 | if (!entry->store) | |
1565 | return -EIO; | |
1566 | return entry->store(rdev, page, length); | |
1567 | } | |
1568 | ||
1569 | static void rdev_free(struct kobject *ko) | |
1570 | { | |
1571 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
1572 | kfree(rdev); | |
1573 | } | |
1574 | static struct sysfs_ops rdev_sysfs_ops = { | |
1575 | .show = rdev_attr_show, | |
1576 | .store = rdev_attr_store, | |
1577 | }; | |
1578 | static struct kobj_type rdev_ktype = { | |
1579 | .release = rdev_free, | |
1580 | .sysfs_ops = &rdev_sysfs_ops, | |
1581 | .default_attrs = rdev_default_attrs, | |
1582 | }; | |
1583 | ||
1da177e4 LT |
1584 | /* |
1585 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
1586 | * | |
1587 | * mark the device faulty if: | |
1588 | * | |
1589 | * - the device is nonexistent (zero size) | |
1590 | * - the device has no valid superblock | |
1591 | * | |
1592 | * a faulty rdev _never_ has rdev->sb set. | |
1593 | */ | |
1594 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
1595 | { | |
1596 | char b[BDEVNAME_SIZE]; | |
1597 | int err; | |
1598 | mdk_rdev_t *rdev; | |
1599 | sector_t size; | |
1600 | ||
1601 | rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL); | |
1602 | if (!rdev) { | |
1603 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
1604 | return ERR_PTR(-ENOMEM); | |
1605 | } | |
1606 | memset(rdev, 0, sizeof(*rdev)); | |
1607 | ||
1608 | if ((err = alloc_disk_sb(rdev))) | |
1609 | goto abort_free; | |
1610 | ||
1611 | err = lock_rdev(rdev, newdev); | |
1612 | if (err) | |
1613 | goto abort_free; | |
1614 | ||
86e6ffdd N |
1615 | rdev->kobj.parent = NULL; |
1616 | rdev->kobj.ktype = &rdev_ktype; | |
1617 | kobject_init(&rdev->kobj); | |
1618 | ||
1da177e4 | 1619 | rdev->desc_nr = -1; |
b2d444d7 | 1620 | rdev->flags = 0; |
1da177e4 LT |
1621 | rdev->data_offset = 0; |
1622 | atomic_set(&rdev->nr_pending, 0); | |
ba22dcbf | 1623 | atomic_set(&rdev->read_errors, 0); |
1da177e4 LT |
1624 | |
1625 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
1626 | if (!size) { | |
1627 | printk(KERN_WARNING | |
1628 | "md: %s has zero or unknown size, marking faulty!\n", | |
1629 | bdevname(rdev->bdev,b)); | |
1630 | err = -EINVAL; | |
1631 | goto abort_free; | |
1632 | } | |
1633 | ||
1634 | if (super_format >= 0) { | |
1635 | err = super_types[super_format]. | |
1636 | load_super(rdev, NULL, super_minor); | |
1637 | if (err == -EINVAL) { | |
1638 | printk(KERN_WARNING | |
1639 | "md: %s has invalid sb, not importing!\n", | |
1640 | bdevname(rdev->bdev,b)); | |
1641 | goto abort_free; | |
1642 | } | |
1643 | if (err < 0) { | |
1644 | printk(KERN_WARNING | |
1645 | "md: could not read %s's sb, not importing!\n", | |
1646 | bdevname(rdev->bdev,b)); | |
1647 | goto abort_free; | |
1648 | } | |
1649 | } | |
1650 | INIT_LIST_HEAD(&rdev->same_set); | |
1651 | ||
1652 | return rdev; | |
1653 | ||
1654 | abort_free: | |
1655 | if (rdev->sb_page) { | |
1656 | if (rdev->bdev) | |
1657 | unlock_rdev(rdev); | |
1658 | free_disk_sb(rdev); | |
1659 | } | |
1660 | kfree(rdev); | |
1661 | return ERR_PTR(err); | |
1662 | } | |
1663 | ||
1664 | /* | |
1665 | * Check a full RAID array for plausibility | |
1666 | */ | |
1667 | ||
1668 | ||
a757e64c | 1669 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
1670 | { |
1671 | int i; | |
1672 | struct list_head *tmp; | |
1673 | mdk_rdev_t *rdev, *freshest; | |
1674 | char b[BDEVNAME_SIZE]; | |
1675 | ||
1676 | freshest = NULL; | |
1677 | ITERATE_RDEV(mddev,rdev,tmp) | |
1678 | switch (super_types[mddev->major_version]. | |
1679 | load_super(rdev, freshest, mddev->minor_version)) { | |
1680 | case 1: | |
1681 | freshest = rdev; | |
1682 | break; | |
1683 | case 0: | |
1684 | break; | |
1685 | default: | |
1686 | printk( KERN_ERR \ | |
1687 | "md: fatal superblock inconsistency in %s" | |
1688 | " -- removing from array\n", | |
1689 | bdevname(rdev->bdev,b)); | |
1690 | kick_rdev_from_array(rdev); | |
1691 | } | |
1692 | ||
1693 | ||
1694 | super_types[mddev->major_version]. | |
1695 | validate_super(mddev, freshest); | |
1696 | ||
1697 | i = 0; | |
1698 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1699 | if (rdev != freshest) | |
1700 | if (super_types[mddev->major_version]. | |
1701 | validate_super(mddev, rdev)) { | |
1702 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
1703 | " from array!\n", | |
1704 | bdevname(rdev->bdev,b)); | |
1705 | kick_rdev_from_array(rdev); | |
1706 | continue; | |
1707 | } | |
1708 | if (mddev->level == LEVEL_MULTIPATH) { | |
1709 | rdev->desc_nr = i++; | |
1710 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 1711 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1712 | } |
1713 | } | |
1714 | ||
1715 | ||
1716 | ||
1717 | if (mddev->recovery_cp != MaxSector && | |
1718 | mddev->level >= 1) | |
1719 | printk(KERN_ERR "md: %s: raid array is not clean" | |
1720 | " -- starting background reconstruction\n", | |
1721 | mdname(mddev)); | |
1722 | ||
1da177e4 LT |
1723 | } |
1724 | ||
eae1701f | 1725 | static ssize_t |
96de1e66 | 1726 | level_show(mddev_t *mddev, char *page) |
eae1701f N |
1727 | { |
1728 | mdk_personality_t *p = mddev->pers; | |
bb636547 | 1729 | if (p == NULL && mddev->raid_disks == 0) |
eae1701f N |
1730 | return 0; |
1731 | if (mddev->level >= 0) | |
bcb97940 | 1732 | return sprintf(page, "raid%d\n", mddev->level); |
eae1701f N |
1733 | else |
1734 | return sprintf(page, "%s\n", p->name); | |
1735 | } | |
1736 | ||
96de1e66 | 1737 | static struct md_sysfs_entry md_level = __ATTR_RO(level); |
eae1701f N |
1738 | |
1739 | static ssize_t | |
96de1e66 | 1740 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 1741 | { |
bb636547 N |
1742 | if (mddev->raid_disks == 0) |
1743 | return 0; | |
eae1701f N |
1744 | return sprintf(page, "%d\n", mddev->raid_disks); |
1745 | } | |
1746 | ||
96de1e66 | 1747 | static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks); |
eae1701f | 1748 | |
24dd469d | 1749 | static ssize_t |
7eec314d | 1750 | action_show(mddev_t *mddev, char *page) |
24dd469d | 1751 | { |
7eec314d | 1752 | char *type = "idle"; |
31399d9e N |
1753 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
1754 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { | |
1755 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
1756 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
1757 | type = "resync"; | |
1758 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
1759 | type = "check"; | |
1760 | else | |
1761 | type = "repair"; | |
1762 | } else | |
1763 | type = "recover"; | |
1764 | } | |
1765 | return sprintf(page, "%s\n", type); | |
1766 | } | |
1767 | ||
1768 | static ssize_t | |
7eec314d | 1769 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 1770 | { |
7eec314d N |
1771 | if (!mddev->pers || !mddev->pers->sync_request) |
1772 | return -EINVAL; | |
1773 | ||
1774 | if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) { | |
1775 | if (mddev->sync_thread) { | |
1776 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1777 | md_unregister_thread(mddev->sync_thread); | |
1778 | mddev->sync_thread = NULL; | |
1779 | mddev->recovery = 0; | |
1780 | } | |
1781 | return len; | |
1782 | } | |
31399d9e N |
1783 | |
1784 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1785 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 1786 | return -EBUSY; |
7eec314d N |
1787 | if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 || |
1788 | strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0) | |
1789 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1790 | else { | |
1791 | if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0) | |
1792 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
1793 | else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0) | |
1794 | return -EINVAL; | |
1795 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
1796 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
1797 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1798 | } | |
24dd469d N |
1799 | md_wakeup_thread(mddev->thread); |
1800 | return len; | |
1801 | } | |
1802 | ||
9d88883e | 1803 | static ssize_t |
96de1e66 | 1804 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
1805 | { |
1806 | return sprintf(page, "%llu\n", | |
1807 | (unsigned long long) mddev->resync_mismatches); | |
1808 | } | |
1809 | ||
96de1e66 | 1810 | static struct md_sysfs_entry |
7eec314d | 1811 | md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
24dd469d | 1812 | |
96de1e66 N |
1813 | |
1814 | static struct md_sysfs_entry | |
1815 | md_mismatches = __ATTR_RO(mismatch_cnt); | |
9d88883e | 1816 | |
eae1701f N |
1817 | static struct attribute *md_default_attrs[] = { |
1818 | &md_level.attr, | |
1819 | &md_raid_disks.attr, | |
411036fa N |
1820 | NULL, |
1821 | }; | |
1822 | ||
1823 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 1824 | &md_scan_mode.attr, |
9d88883e | 1825 | &md_mismatches.attr, |
eae1701f N |
1826 | NULL, |
1827 | }; | |
411036fa N |
1828 | static struct attribute_group md_redundancy_group = { |
1829 | .name = NULL, | |
1830 | .attrs = md_redundancy_attrs, | |
1831 | }; | |
1832 | ||
eae1701f N |
1833 | |
1834 | static ssize_t | |
1835 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1836 | { | |
1837 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
1838 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 1839 | ssize_t rv; |
eae1701f N |
1840 | |
1841 | if (!entry->show) | |
1842 | return -EIO; | |
96de1e66 N |
1843 | mddev_lock(mddev); |
1844 | rv = entry->show(mddev, page); | |
1845 | mddev_unlock(mddev); | |
1846 | return rv; | |
eae1701f N |
1847 | } |
1848 | ||
1849 | static ssize_t | |
1850 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
1851 | const char *page, size_t length) | |
1852 | { | |
1853 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
1854 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 1855 | ssize_t rv; |
eae1701f N |
1856 | |
1857 | if (!entry->store) | |
1858 | return -EIO; | |
96de1e66 N |
1859 | mddev_lock(mddev); |
1860 | rv = entry->store(mddev, page, length); | |
1861 | mddev_unlock(mddev); | |
1862 | return rv; | |
eae1701f N |
1863 | } |
1864 | ||
1865 | static void md_free(struct kobject *ko) | |
1866 | { | |
1867 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
1868 | kfree(mddev); | |
1869 | } | |
1870 | ||
1871 | static struct sysfs_ops md_sysfs_ops = { | |
1872 | .show = md_attr_show, | |
1873 | .store = md_attr_store, | |
1874 | }; | |
1875 | static struct kobj_type md_ktype = { | |
1876 | .release = md_free, | |
1877 | .sysfs_ops = &md_sysfs_ops, | |
1878 | .default_attrs = md_default_attrs, | |
1879 | }; | |
1880 | ||
1da177e4 LT |
1881 | int mdp_major = 0; |
1882 | ||
1883 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
1884 | { | |
1885 | static DECLARE_MUTEX(disks_sem); | |
1886 | mddev_t *mddev = mddev_find(dev); | |
1887 | struct gendisk *disk; | |
1888 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
1889 | int shift = partitioned ? MdpMinorShift : 0; | |
1890 | int unit = MINOR(dev) >> shift; | |
1891 | ||
1892 | if (!mddev) | |
1893 | return NULL; | |
1894 | ||
1895 | down(&disks_sem); | |
1896 | if (mddev->gendisk) { | |
1897 | up(&disks_sem); | |
1898 | mddev_put(mddev); | |
1899 | return NULL; | |
1900 | } | |
1901 | disk = alloc_disk(1 << shift); | |
1902 | if (!disk) { | |
1903 | up(&disks_sem); | |
1904 | mddev_put(mddev); | |
1905 | return NULL; | |
1906 | } | |
1907 | disk->major = MAJOR(dev); | |
1908 | disk->first_minor = unit << shift; | |
1909 | if (partitioned) { | |
1910 | sprintf(disk->disk_name, "md_d%d", unit); | |
1911 | sprintf(disk->devfs_name, "md/d%d", unit); | |
1912 | } else { | |
1913 | sprintf(disk->disk_name, "md%d", unit); | |
1914 | sprintf(disk->devfs_name, "md/%d", unit); | |
1915 | } | |
1916 | disk->fops = &md_fops; | |
1917 | disk->private_data = mddev; | |
1918 | disk->queue = mddev->queue; | |
1919 | add_disk(disk); | |
1920 | mddev->gendisk = disk; | |
1921 | up(&disks_sem); | |
9c791977 | 1922 | mddev->kobj.parent = &disk->kobj; |
eae1701f N |
1923 | mddev->kobj.k_name = NULL; |
1924 | snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); | |
1925 | mddev->kobj.ktype = &md_ktype; | |
1926 | kobject_register(&mddev->kobj); | |
1da177e4 LT |
1927 | return NULL; |
1928 | } | |
1929 | ||
1930 | void md_wakeup_thread(mdk_thread_t *thread); | |
1931 | ||
1932 | static void md_safemode_timeout(unsigned long data) | |
1933 | { | |
1934 | mddev_t *mddev = (mddev_t *) data; | |
1935 | ||
1936 | mddev->safemode = 1; | |
1937 | md_wakeup_thread(mddev->thread); | |
1938 | } | |
1939 | ||
6ff8d8ec | 1940 | static int start_dirty_degraded; |
1da177e4 LT |
1941 | |
1942 | static int do_md_run(mddev_t * mddev) | |
1943 | { | |
1944 | int pnum, err; | |
1945 | int chunk_size; | |
1946 | struct list_head *tmp; | |
1947 | mdk_rdev_t *rdev; | |
1948 | struct gendisk *disk; | |
1949 | char b[BDEVNAME_SIZE]; | |
1950 | ||
a757e64c N |
1951 | if (list_empty(&mddev->disks)) |
1952 | /* cannot run an array with no devices.. */ | |
1da177e4 | 1953 | return -EINVAL; |
1da177e4 LT |
1954 | |
1955 | if (mddev->pers) | |
1956 | return -EBUSY; | |
1957 | ||
1958 | /* | |
1959 | * Analyze all RAID superblock(s) | |
1960 | */ | |
a757e64c N |
1961 | if (!mddev->raid_disks) |
1962 | analyze_sbs(mddev); | |
1da177e4 LT |
1963 | |
1964 | chunk_size = mddev->chunk_size; | |
1965 | pnum = level_to_pers(mddev->level); | |
1966 | ||
1967 | if ((pnum != MULTIPATH) && (pnum != RAID1)) { | |
1968 | if (!chunk_size) { | |
1969 | /* | |
1970 | * 'default chunksize' in the old md code used to | |
1971 | * be PAGE_SIZE, baaad. | |
1972 | * we abort here to be on the safe side. We don't | |
1973 | * want to continue the bad practice. | |
1974 | */ | |
1975 | printk(KERN_ERR | |
1976 | "no chunksize specified, see 'man raidtab'\n"); | |
1977 | return -EINVAL; | |
1978 | } | |
1979 | if (chunk_size > MAX_CHUNK_SIZE) { | |
1980 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
1981 | chunk_size, MAX_CHUNK_SIZE); | |
1982 | return -EINVAL; | |
1983 | } | |
1984 | /* | |
1985 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
1986 | */ | |
1987 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 1988 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
1989 | return -EINVAL; |
1990 | } | |
1991 | if (chunk_size < PAGE_SIZE) { | |
1992 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
1993 | chunk_size, PAGE_SIZE); | |
1994 | return -EINVAL; | |
1995 | } | |
1996 | ||
1997 | /* devices must have minimum size of one chunk */ | |
1998 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 1999 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2000 | continue; |
2001 | if (rdev->size < chunk_size / 1024) { | |
2002 | printk(KERN_WARNING | |
2003 | "md: Dev %s smaller than chunk_size:" | |
2004 | " %lluk < %dk\n", | |
2005 | bdevname(rdev->bdev,b), | |
2006 | (unsigned long long)rdev->size, | |
2007 | chunk_size / 1024); | |
2008 | return -EINVAL; | |
2009 | } | |
2010 | } | |
2011 | } | |
2012 | ||
1da177e4 LT |
2013 | #ifdef CONFIG_KMOD |
2014 | if (!pers[pnum]) | |
2015 | { | |
2016 | request_module("md-personality-%d", pnum); | |
2017 | } | |
2018 | #endif | |
2019 | ||
2020 | /* | |
2021 | * Drop all container device buffers, from now on | |
2022 | * the only valid external interface is through the md | |
2023 | * device. | |
2024 | * Also find largest hardsector size | |
2025 | */ | |
2026 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2027 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2028 | continue; |
2029 | sync_blockdev(rdev->bdev); | |
2030 | invalidate_bdev(rdev->bdev, 0); | |
2031 | } | |
2032 | ||
2033 | md_probe(mddev->unit, NULL, NULL); | |
2034 | disk = mddev->gendisk; | |
2035 | if (!disk) | |
2036 | return -ENOMEM; | |
2037 | ||
2038 | spin_lock(&pers_lock); | |
2039 | if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) { | |
2040 | spin_unlock(&pers_lock); | |
2041 | printk(KERN_WARNING "md: personality %d is not loaded!\n", | |
2042 | pnum); | |
2043 | return -EINVAL; | |
2044 | } | |
2045 | ||
2046 | mddev->pers = pers[pnum]; | |
2047 | spin_unlock(&pers_lock); | |
2048 | ||
657390d2 | 2049 | mddev->recovery = 0; |
1da177e4 | 2050 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 2051 | mddev->barriers_work = 1; |
6ff8d8ec | 2052 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 2053 | |
f91de92e N |
2054 | if (start_readonly) |
2055 | mddev->ro = 2; /* read-only, but switch on first write */ | |
2056 | ||
b15c2e57 N |
2057 | err = mddev->pers->run(mddev); |
2058 | if (!err && mddev->pers->sync_request) { | |
2059 | err = bitmap_create(mddev); | |
2060 | if (err) { | |
2061 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
2062 | mdname(mddev), err); | |
2063 | mddev->pers->stop(mddev); | |
2064 | } | |
2065 | } | |
1da177e4 LT |
2066 | if (err) { |
2067 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
2068 | module_put(mddev->pers->owner); | |
2069 | mddev->pers = NULL; | |
32a7627c N |
2070 | bitmap_destroy(mddev); |
2071 | return err; | |
1da177e4 | 2072 | } |
411036fa N |
2073 | if (mddev->pers->sync_request) |
2074 | sysfs_create_group(&mddev->kobj, &md_redundancy_group); | |
fd9d49ca N |
2075 | else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
2076 | mddev->ro = 0; | |
2077 | ||
1da177e4 LT |
2078 | atomic_set(&mddev->writes_pending,0); |
2079 | mddev->safemode = 0; | |
2080 | mddev->safemode_timer.function = md_safemode_timeout; | |
2081 | mddev->safemode_timer.data = (unsigned long) mddev; | |
2082 | mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ | |
2083 | mddev->in_sync = 1; | |
86e6ffdd N |
2084 | |
2085 | ITERATE_RDEV(mddev,rdev,tmp) | |
2086 | if (rdev->raid_disk >= 0) { | |
2087 | char nm[20]; | |
2088 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2089 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
2090 | } | |
1da177e4 LT |
2091 | |
2092 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2093 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2094 | |
2095 | if (mddev->sb_dirty) | |
2096 | md_update_sb(mddev); | |
2097 | ||
2098 | set_capacity(disk, mddev->array_size<<1); | |
2099 | ||
2100 | /* If we call blk_queue_make_request here, it will | |
2101 | * re-initialise max_sectors etc which may have been | |
2102 | * refined inside -> run. So just set the bits we need to set. | |
2103 | * Most initialisation happended when we called | |
2104 | * blk_queue_make_request(..., md_fail_request) | |
2105 | * earlier. | |
2106 | */ | |
2107 | mddev->queue->queuedata = mddev; | |
2108 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
2109 | ||
2110 | mddev->changed = 1; | |
2111 | return 0; | |
2112 | } | |
2113 | ||
2114 | static int restart_array(mddev_t *mddev) | |
2115 | { | |
2116 | struct gendisk *disk = mddev->gendisk; | |
2117 | int err; | |
2118 | ||
2119 | /* | |
2120 | * Complain if it has no devices | |
2121 | */ | |
2122 | err = -ENXIO; | |
2123 | if (list_empty(&mddev->disks)) | |
2124 | goto out; | |
2125 | ||
2126 | if (mddev->pers) { | |
2127 | err = -EBUSY; | |
2128 | if (!mddev->ro) | |
2129 | goto out; | |
2130 | ||
2131 | mddev->safemode = 0; | |
2132 | mddev->ro = 0; | |
2133 | set_disk_ro(disk, 0); | |
2134 | ||
2135 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
2136 | mdname(mddev)); | |
2137 | /* | |
2138 | * Kick recovery or resync if necessary | |
2139 | */ | |
2140 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2141 | md_wakeup_thread(mddev->thread); | |
2142 | err = 0; | |
2143 | } else { | |
2144 | printk(KERN_ERR "md: %s has no personality assigned.\n", | |
2145 | mdname(mddev)); | |
2146 | err = -EINVAL; | |
2147 | } | |
2148 | ||
2149 | out: | |
2150 | return err; | |
2151 | } | |
2152 | ||
2153 | static int do_md_stop(mddev_t * mddev, int ro) | |
2154 | { | |
2155 | int err = 0; | |
2156 | struct gendisk *disk = mddev->gendisk; | |
2157 | ||
2158 | if (mddev->pers) { | |
2159 | if (atomic_read(&mddev->active)>2) { | |
2160 | printk("md: %s still in use.\n",mdname(mddev)); | |
2161 | return -EBUSY; | |
2162 | } | |
2163 | ||
2164 | if (mddev->sync_thread) { | |
2165 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2166 | md_unregister_thread(mddev->sync_thread); | |
2167 | mddev->sync_thread = NULL; | |
2168 | } | |
2169 | ||
2170 | del_timer_sync(&mddev->safemode_timer); | |
2171 | ||
2172 | invalidate_partition(disk, 0); | |
2173 | ||
2174 | if (ro) { | |
2175 | err = -ENXIO; | |
f91de92e | 2176 | if (mddev->ro==1) |
1da177e4 LT |
2177 | goto out; |
2178 | mddev->ro = 1; | |
2179 | } else { | |
6b8b3e8a | 2180 | bitmap_flush(mddev); |
a9701a30 | 2181 | md_super_wait(mddev); |
1da177e4 LT |
2182 | if (mddev->ro) |
2183 | set_disk_ro(disk, 0); | |
2184 | blk_queue_make_request(mddev->queue, md_fail_request); | |
2185 | mddev->pers->stop(mddev); | |
411036fa N |
2186 | if (mddev->pers->sync_request) |
2187 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
2188 | ||
1da177e4 LT |
2189 | module_put(mddev->pers->owner); |
2190 | mddev->pers = NULL; | |
2191 | if (mddev->ro) | |
2192 | mddev->ro = 0; | |
2193 | } | |
2194 | if (!mddev->in_sync) { | |
2195 | /* mark array as shutdown cleanly */ | |
2196 | mddev->in_sync = 1; | |
2197 | md_update_sb(mddev); | |
2198 | } | |
2199 | if (ro) | |
2200 | set_disk_ro(disk, 1); | |
2201 | } | |
32a7627c N |
2202 | |
2203 | bitmap_destroy(mddev); | |
2204 | if (mddev->bitmap_file) { | |
2205 | atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1); | |
2206 | fput(mddev->bitmap_file); | |
2207 | mddev->bitmap_file = NULL; | |
2208 | } | |
9223214e | 2209 | mddev->bitmap_offset = 0; |
32a7627c | 2210 | |
1da177e4 LT |
2211 | /* |
2212 | * Free resources if final stop | |
2213 | */ | |
2214 | if (!ro) { | |
86e6ffdd N |
2215 | mdk_rdev_t *rdev; |
2216 | struct list_head *tmp; | |
1da177e4 LT |
2217 | struct gendisk *disk; |
2218 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); | |
2219 | ||
86e6ffdd N |
2220 | ITERATE_RDEV(mddev,rdev,tmp) |
2221 | if (rdev->raid_disk >= 0) { | |
2222 | char nm[20]; | |
2223 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2224 | sysfs_remove_link(&mddev->kobj, nm); | |
2225 | } | |
2226 | ||
1da177e4 LT |
2227 | export_array(mddev); |
2228 | ||
2229 | mddev->array_size = 0; | |
2230 | disk = mddev->gendisk; | |
2231 | if (disk) | |
2232 | set_capacity(disk, 0); | |
2233 | mddev->changed = 1; | |
2234 | } else | |
2235 | printk(KERN_INFO "md: %s switched to read-only mode.\n", | |
2236 | mdname(mddev)); | |
2237 | err = 0; | |
2238 | out: | |
2239 | return err; | |
2240 | } | |
2241 | ||
2242 | static void autorun_array(mddev_t *mddev) | |
2243 | { | |
2244 | mdk_rdev_t *rdev; | |
2245 | struct list_head *tmp; | |
2246 | int err; | |
2247 | ||
a757e64c | 2248 | if (list_empty(&mddev->disks)) |
1da177e4 | 2249 | return; |
1da177e4 LT |
2250 | |
2251 | printk(KERN_INFO "md: running: "); | |
2252 | ||
2253 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2254 | char b[BDEVNAME_SIZE]; | |
2255 | printk("<%s>", bdevname(rdev->bdev,b)); | |
2256 | } | |
2257 | printk("\n"); | |
2258 | ||
2259 | err = do_md_run (mddev); | |
2260 | if (err) { | |
2261 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
2262 | do_md_stop (mddev, 0); | |
2263 | } | |
2264 | } | |
2265 | ||
2266 | /* | |
2267 | * lets try to run arrays based on all disks that have arrived | |
2268 | * until now. (those are in pending_raid_disks) | |
2269 | * | |
2270 | * the method: pick the first pending disk, collect all disks with | |
2271 | * the same UUID, remove all from the pending list and put them into | |
2272 | * the 'same_array' list. Then order this list based on superblock | |
2273 | * update time (freshest comes first), kick out 'old' disks and | |
2274 | * compare superblocks. If everything's fine then run it. | |
2275 | * | |
2276 | * If "unit" is allocated, then bump its reference count | |
2277 | */ | |
2278 | static void autorun_devices(int part) | |
2279 | { | |
2280 | struct list_head candidates; | |
2281 | struct list_head *tmp; | |
2282 | mdk_rdev_t *rdev0, *rdev; | |
2283 | mddev_t *mddev; | |
2284 | char b[BDEVNAME_SIZE]; | |
2285 | ||
2286 | printk(KERN_INFO "md: autorun ...\n"); | |
2287 | while (!list_empty(&pending_raid_disks)) { | |
2288 | dev_t dev; | |
2289 | rdev0 = list_entry(pending_raid_disks.next, | |
2290 | mdk_rdev_t, same_set); | |
2291 | ||
2292 | printk(KERN_INFO "md: considering %s ...\n", | |
2293 | bdevname(rdev0->bdev,b)); | |
2294 | INIT_LIST_HEAD(&candidates); | |
2295 | ITERATE_RDEV_PENDING(rdev,tmp) | |
2296 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
2297 | printk(KERN_INFO "md: adding %s ...\n", | |
2298 | bdevname(rdev->bdev,b)); | |
2299 | list_move(&rdev->same_set, &candidates); | |
2300 | } | |
2301 | /* | |
2302 | * now we have a set of devices, with all of them having | |
2303 | * mostly sane superblocks. It's time to allocate the | |
2304 | * mddev. | |
2305 | */ | |
2306 | if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { | |
2307 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", | |
2308 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
2309 | break; | |
2310 | } | |
2311 | if (part) | |
2312 | dev = MKDEV(mdp_major, | |
2313 | rdev0->preferred_minor << MdpMinorShift); | |
2314 | else | |
2315 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
2316 | ||
2317 | md_probe(dev, NULL, NULL); | |
2318 | mddev = mddev_find(dev); | |
2319 | if (!mddev) { | |
2320 | printk(KERN_ERR | |
2321 | "md: cannot allocate memory for md drive.\n"); | |
2322 | break; | |
2323 | } | |
2324 | if (mddev_lock(mddev)) | |
2325 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
2326 | mdname(mddev)); | |
2327 | else if (mddev->raid_disks || mddev->major_version | |
2328 | || !list_empty(&mddev->disks)) { | |
2329 | printk(KERN_WARNING | |
2330 | "md: %s already running, cannot run %s\n", | |
2331 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
2332 | mddev_unlock(mddev); | |
2333 | } else { | |
2334 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
2335 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { | |
2336 | list_del_init(&rdev->same_set); | |
2337 | if (bind_rdev_to_array(rdev, mddev)) | |
2338 | export_rdev(rdev); | |
2339 | } | |
2340 | autorun_array(mddev); | |
2341 | mddev_unlock(mddev); | |
2342 | } | |
2343 | /* on success, candidates will be empty, on error | |
2344 | * it won't... | |
2345 | */ | |
2346 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) | |
2347 | export_rdev(rdev); | |
2348 | mddev_put(mddev); | |
2349 | } | |
2350 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
2351 | } | |
2352 | ||
2353 | /* | |
2354 | * import RAID devices based on one partition | |
2355 | * if possible, the array gets run as well. | |
2356 | */ | |
2357 | ||
2358 | static int autostart_array(dev_t startdev) | |
2359 | { | |
2360 | char b[BDEVNAME_SIZE]; | |
2361 | int err = -EINVAL, i; | |
2362 | mdp_super_t *sb = NULL; | |
2363 | mdk_rdev_t *start_rdev = NULL, *rdev; | |
2364 | ||
2365 | start_rdev = md_import_device(startdev, 0, 0); | |
2366 | if (IS_ERR(start_rdev)) | |
2367 | return err; | |
2368 | ||
2369 | ||
2370 | /* NOTE: this can only work for 0.90.0 superblocks */ | |
2371 | sb = (mdp_super_t*)page_address(start_rdev->sb_page); | |
2372 | if (sb->major_version != 0 || | |
2373 | sb->minor_version != 90 ) { | |
2374 | printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); | |
2375 | export_rdev(start_rdev); | |
2376 | return err; | |
2377 | } | |
2378 | ||
b2d444d7 | 2379 | if (test_bit(Faulty, &start_rdev->flags)) { |
1da177e4 LT |
2380 | printk(KERN_WARNING |
2381 | "md: can not autostart based on faulty %s!\n", | |
2382 | bdevname(start_rdev->bdev,b)); | |
2383 | export_rdev(start_rdev); | |
2384 | return err; | |
2385 | } | |
2386 | list_add(&start_rdev->same_set, &pending_raid_disks); | |
2387 | ||
2388 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2389 | mdp_disk_t *desc = sb->disks + i; | |
2390 | dev_t dev = MKDEV(desc->major, desc->minor); | |
2391 | ||
2392 | if (!dev) | |
2393 | continue; | |
2394 | if (dev == startdev) | |
2395 | continue; | |
2396 | if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) | |
2397 | continue; | |
2398 | rdev = md_import_device(dev, 0, 0); | |
2399 | if (IS_ERR(rdev)) | |
2400 | continue; | |
2401 | ||
2402 | list_add(&rdev->same_set, &pending_raid_disks); | |
2403 | } | |
2404 | ||
2405 | /* | |
2406 | * possibly return codes | |
2407 | */ | |
2408 | autorun_devices(0); | |
2409 | return 0; | |
2410 | ||
2411 | } | |
2412 | ||
2413 | ||
2414 | static int get_version(void __user * arg) | |
2415 | { | |
2416 | mdu_version_t ver; | |
2417 | ||
2418 | ver.major = MD_MAJOR_VERSION; | |
2419 | ver.minor = MD_MINOR_VERSION; | |
2420 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
2421 | ||
2422 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
2423 | return -EFAULT; | |
2424 | ||
2425 | return 0; | |
2426 | } | |
2427 | ||
2428 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
2429 | { | |
2430 | mdu_array_info_t info; | |
2431 | int nr,working,active,failed,spare; | |
2432 | mdk_rdev_t *rdev; | |
2433 | struct list_head *tmp; | |
2434 | ||
2435 | nr=working=active=failed=spare=0; | |
2436 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2437 | nr++; | |
b2d444d7 | 2438 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2439 | failed++; |
2440 | else { | |
2441 | working++; | |
b2d444d7 | 2442 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
2443 | active++; |
2444 | else | |
2445 | spare++; | |
2446 | } | |
2447 | } | |
2448 | ||
2449 | info.major_version = mddev->major_version; | |
2450 | info.minor_version = mddev->minor_version; | |
2451 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
2452 | info.ctime = mddev->ctime; | |
2453 | info.level = mddev->level; | |
2454 | info.size = mddev->size; | |
2455 | info.nr_disks = nr; | |
2456 | info.raid_disks = mddev->raid_disks; | |
2457 | info.md_minor = mddev->md_minor; | |
2458 | info.not_persistent= !mddev->persistent; | |
2459 | ||
2460 | info.utime = mddev->utime; | |
2461 | info.state = 0; | |
2462 | if (mddev->in_sync) | |
2463 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
2464 | if (mddev->bitmap && mddev->bitmap_offset) |
2465 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
2466 | info.active_disks = active; |
2467 | info.working_disks = working; | |
2468 | info.failed_disks = failed; | |
2469 | info.spare_disks = spare; | |
2470 | ||
2471 | info.layout = mddev->layout; | |
2472 | info.chunk_size = mddev->chunk_size; | |
2473 | ||
2474 | if (copy_to_user(arg, &info, sizeof(info))) | |
2475 | return -EFAULT; | |
2476 | ||
2477 | return 0; | |
2478 | } | |
2479 | ||
87162a28 | 2480 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
2481 | { |
2482 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
2483 | char *ptr, *buf = NULL; | |
2484 | int err = -ENOMEM; | |
2485 | ||
2486 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2487 | if (!file) | |
2488 | goto out; | |
2489 | ||
2490 | /* bitmap disabled, zero the first byte and copy out */ | |
2491 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
2492 | file->pathname[0] = '\0'; | |
2493 | goto copy_out; | |
2494 | } | |
2495 | ||
2496 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
2497 | if (!buf) | |
2498 | goto out; | |
2499 | ||
2500 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
2501 | if (!ptr) | |
2502 | goto out; | |
2503 | ||
2504 | strcpy(file->pathname, ptr); | |
2505 | ||
2506 | copy_out: | |
2507 | err = 0; | |
2508 | if (copy_to_user(arg, file, sizeof(*file))) | |
2509 | err = -EFAULT; | |
2510 | out: | |
2511 | kfree(buf); | |
2512 | kfree(file); | |
2513 | return err; | |
2514 | } | |
2515 | ||
1da177e4 LT |
2516 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
2517 | { | |
2518 | mdu_disk_info_t info; | |
2519 | unsigned int nr; | |
2520 | mdk_rdev_t *rdev; | |
2521 | ||
2522 | if (copy_from_user(&info, arg, sizeof(info))) | |
2523 | return -EFAULT; | |
2524 | ||
2525 | nr = info.number; | |
2526 | ||
2527 | rdev = find_rdev_nr(mddev, nr); | |
2528 | if (rdev) { | |
2529 | info.major = MAJOR(rdev->bdev->bd_dev); | |
2530 | info.minor = MINOR(rdev->bdev->bd_dev); | |
2531 | info.raid_disk = rdev->raid_disk; | |
2532 | info.state = 0; | |
b2d444d7 | 2533 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 2534 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 2535 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2536 | info.state |= (1<<MD_DISK_ACTIVE); |
2537 | info.state |= (1<<MD_DISK_SYNC); | |
2538 | } | |
8ddf9efe N |
2539 | if (test_bit(WriteMostly, &rdev->flags)) |
2540 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
2541 | } else { |
2542 | info.major = info.minor = 0; | |
2543 | info.raid_disk = -1; | |
2544 | info.state = (1<<MD_DISK_REMOVED); | |
2545 | } | |
2546 | ||
2547 | if (copy_to_user(arg, &info, sizeof(info))) | |
2548 | return -EFAULT; | |
2549 | ||
2550 | return 0; | |
2551 | } | |
2552 | ||
2553 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
2554 | { | |
2555 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
2556 | mdk_rdev_t *rdev; | |
2557 | dev_t dev = MKDEV(info->major,info->minor); | |
2558 | ||
2559 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
2560 | return -EOVERFLOW; | |
2561 | ||
2562 | if (!mddev->raid_disks) { | |
2563 | int err; | |
2564 | /* expecting a device which has a superblock */ | |
2565 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
2566 | if (IS_ERR(rdev)) { | |
2567 | printk(KERN_WARNING | |
2568 | "md: md_import_device returned %ld\n", | |
2569 | PTR_ERR(rdev)); | |
2570 | return PTR_ERR(rdev); | |
2571 | } | |
2572 | if (!list_empty(&mddev->disks)) { | |
2573 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2574 | mdk_rdev_t, same_set); | |
2575 | int err = super_types[mddev->major_version] | |
2576 | .load_super(rdev, rdev0, mddev->minor_version); | |
2577 | if (err < 0) { | |
2578 | printk(KERN_WARNING | |
2579 | "md: %s has different UUID to %s\n", | |
2580 | bdevname(rdev->bdev,b), | |
2581 | bdevname(rdev0->bdev,b2)); | |
2582 | export_rdev(rdev); | |
2583 | return -EINVAL; | |
2584 | } | |
2585 | } | |
2586 | err = bind_rdev_to_array(rdev, mddev); | |
2587 | if (err) | |
2588 | export_rdev(rdev); | |
2589 | return err; | |
2590 | } | |
2591 | ||
2592 | /* | |
2593 | * add_new_disk can be used once the array is assembled | |
2594 | * to add "hot spares". They must already have a superblock | |
2595 | * written | |
2596 | */ | |
2597 | if (mddev->pers) { | |
2598 | int err; | |
2599 | if (!mddev->pers->hot_add_disk) { | |
2600 | printk(KERN_WARNING | |
2601 | "%s: personality does not support diskops!\n", | |
2602 | mdname(mddev)); | |
2603 | return -EINVAL; | |
2604 | } | |
7b1e35f6 N |
2605 | if (mddev->persistent) |
2606 | rdev = md_import_device(dev, mddev->major_version, | |
2607 | mddev->minor_version); | |
2608 | else | |
2609 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
2610 | if (IS_ERR(rdev)) { |
2611 | printk(KERN_WARNING | |
2612 | "md: md_import_device returned %ld\n", | |
2613 | PTR_ERR(rdev)); | |
2614 | return PTR_ERR(rdev); | |
2615 | } | |
41158c7e N |
2616 | /* set save_raid_disk if appropriate */ |
2617 | if (!mddev->persistent) { | |
2618 | if (info->state & (1<<MD_DISK_SYNC) && | |
2619 | info->raid_disk < mddev->raid_disks) | |
2620 | rdev->raid_disk = info->raid_disk; | |
2621 | else | |
2622 | rdev->raid_disk = -1; | |
2623 | } else | |
2624 | super_types[mddev->major_version]. | |
2625 | validate_super(mddev, rdev); | |
2626 | rdev->saved_raid_disk = rdev->raid_disk; | |
2627 | ||
b2d444d7 | 2628 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
2629 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
2630 | set_bit(WriteMostly, &rdev->flags); | |
2631 | ||
1da177e4 LT |
2632 | rdev->raid_disk = -1; |
2633 | err = bind_rdev_to_array(rdev, mddev); | |
2634 | if (err) | |
2635 | export_rdev(rdev); | |
c361777f N |
2636 | |
2637 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2638 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2639 | return err; |
2640 | } | |
2641 | ||
2642 | /* otherwise, add_new_disk is only allowed | |
2643 | * for major_version==0 superblocks | |
2644 | */ | |
2645 | if (mddev->major_version != 0) { | |
2646 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
2647 | mdname(mddev)); | |
2648 | return -EINVAL; | |
2649 | } | |
2650 | ||
2651 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
2652 | int err; | |
2653 | rdev = md_import_device (dev, -1, 0); | |
2654 | if (IS_ERR(rdev)) { | |
2655 | printk(KERN_WARNING | |
2656 | "md: error, md_import_device() returned %ld\n", | |
2657 | PTR_ERR(rdev)); | |
2658 | return PTR_ERR(rdev); | |
2659 | } | |
2660 | rdev->desc_nr = info->number; | |
2661 | if (info->raid_disk < mddev->raid_disks) | |
2662 | rdev->raid_disk = info->raid_disk; | |
2663 | else | |
2664 | rdev->raid_disk = -1; | |
2665 | ||
b2d444d7 N |
2666 | rdev->flags = 0; |
2667 | ||
1da177e4 | 2668 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
2669 | if (info->state & (1<<MD_DISK_SYNC)) |
2670 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 2671 | |
8ddf9efe N |
2672 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
2673 | set_bit(WriteMostly, &rdev->flags); | |
2674 | ||
1da177e4 LT |
2675 | err = bind_rdev_to_array(rdev, mddev); |
2676 | if (err) { | |
2677 | export_rdev(rdev); | |
2678 | return err; | |
2679 | } | |
2680 | ||
2681 | if (!mddev->persistent) { | |
2682 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
2683 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2684 | } else | |
2685 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
2686 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
2687 | ||
2688 | if (!mddev->size || (mddev->size > rdev->size)) | |
2689 | mddev->size = rdev->size; | |
2690 | } | |
2691 | ||
2692 | return 0; | |
2693 | } | |
2694 | ||
2695 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
2696 | { | |
2697 | char b[BDEVNAME_SIZE]; | |
2698 | mdk_rdev_t *rdev; | |
2699 | ||
2700 | if (!mddev->pers) | |
2701 | return -ENODEV; | |
2702 | ||
2703 | rdev = find_rdev(mddev, dev); | |
2704 | if (!rdev) | |
2705 | return -ENXIO; | |
2706 | ||
2707 | if (rdev->raid_disk >= 0) | |
2708 | goto busy; | |
2709 | ||
2710 | kick_rdev_from_array(rdev); | |
2711 | md_update_sb(mddev); | |
2712 | ||
2713 | return 0; | |
2714 | busy: | |
2715 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", | |
2716 | bdevname(rdev->bdev,b), mdname(mddev)); | |
2717 | return -EBUSY; | |
2718 | } | |
2719 | ||
2720 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
2721 | { | |
2722 | char b[BDEVNAME_SIZE]; | |
2723 | int err; | |
2724 | unsigned int size; | |
2725 | mdk_rdev_t *rdev; | |
2726 | ||
2727 | if (!mddev->pers) | |
2728 | return -ENODEV; | |
2729 | ||
2730 | if (mddev->major_version != 0) { | |
2731 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
2732 | " version-0 superblocks.\n", | |
2733 | mdname(mddev)); | |
2734 | return -EINVAL; | |
2735 | } | |
2736 | if (!mddev->pers->hot_add_disk) { | |
2737 | printk(KERN_WARNING | |
2738 | "%s: personality does not support diskops!\n", | |
2739 | mdname(mddev)); | |
2740 | return -EINVAL; | |
2741 | } | |
2742 | ||
2743 | rdev = md_import_device (dev, -1, 0); | |
2744 | if (IS_ERR(rdev)) { | |
2745 | printk(KERN_WARNING | |
2746 | "md: error, md_import_device() returned %ld\n", | |
2747 | PTR_ERR(rdev)); | |
2748 | return -EINVAL; | |
2749 | } | |
2750 | ||
2751 | if (mddev->persistent) | |
2752 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
2753 | else | |
2754 | rdev->sb_offset = | |
2755 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2756 | ||
2757 | size = calc_dev_size(rdev, mddev->chunk_size); | |
2758 | rdev->size = size; | |
2759 | ||
2760 | if (size < mddev->size) { | |
2761 | printk(KERN_WARNING | |
2762 | "%s: disk size %llu blocks < array size %llu\n", | |
2763 | mdname(mddev), (unsigned long long)size, | |
2764 | (unsigned long long)mddev->size); | |
2765 | err = -ENOSPC; | |
2766 | goto abort_export; | |
2767 | } | |
2768 | ||
b2d444d7 | 2769 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
2770 | printk(KERN_WARNING |
2771 | "md: can not hot-add faulty %s disk to %s!\n", | |
2772 | bdevname(rdev->bdev,b), mdname(mddev)); | |
2773 | err = -EINVAL; | |
2774 | goto abort_export; | |
2775 | } | |
b2d444d7 | 2776 | clear_bit(In_sync, &rdev->flags); |
1da177e4 LT |
2777 | rdev->desc_nr = -1; |
2778 | bind_rdev_to_array(rdev, mddev); | |
2779 | ||
2780 | /* | |
2781 | * The rest should better be atomic, we can have disk failures | |
2782 | * noticed in interrupt contexts ... | |
2783 | */ | |
2784 | ||
2785 | if (rdev->desc_nr == mddev->max_disks) { | |
2786 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
2787 | mdname(mddev)); | |
2788 | err = -EBUSY; | |
2789 | goto abort_unbind_export; | |
2790 | } | |
2791 | ||
2792 | rdev->raid_disk = -1; | |
2793 | ||
2794 | md_update_sb(mddev); | |
2795 | ||
2796 | /* | |
2797 | * Kick recovery, maybe this spare has to be added to the | |
2798 | * array immediately. | |
2799 | */ | |
2800 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2801 | md_wakeup_thread(mddev->thread); | |
2802 | ||
2803 | return 0; | |
2804 | ||
2805 | abort_unbind_export: | |
2806 | unbind_rdev_from_array(rdev); | |
2807 | ||
2808 | abort_export: | |
2809 | export_rdev(rdev); | |
2810 | return err; | |
2811 | } | |
2812 | ||
32a7627c N |
2813 | /* similar to deny_write_access, but accounts for our holding a reference |
2814 | * to the file ourselves */ | |
2815 | static int deny_bitmap_write_access(struct file * file) | |
2816 | { | |
2817 | struct inode *inode = file->f_mapping->host; | |
2818 | ||
2819 | spin_lock(&inode->i_lock); | |
2820 | if (atomic_read(&inode->i_writecount) > 1) { | |
2821 | spin_unlock(&inode->i_lock); | |
2822 | return -ETXTBSY; | |
2823 | } | |
2824 | atomic_set(&inode->i_writecount, -1); | |
2825 | spin_unlock(&inode->i_lock); | |
2826 | ||
2827 | return 0; | |
2828 | } | |
2829 | ||
2830 | static int set_bitmap_file(mddev_t *mddev, int fd) | |
2831 | { | |
2832 | int err; | |
2833 | ||
36fa3063 N |
2834 | if (mddev->pers) { |
2835 | if (!mddev->pers->quiesce) | |
2836 | return -EBUSY; | |
2837 | if (mddev->recovery || mddev->sync_thread) | |
2838 | return -EBUSY; | |
2839 | /* we should be able to change the bitmap.. */ | |
2840 | } | |
32a7627c | 2841 | |
32a7627c | 2842 | |
36fa3063 N |
2843 | if (fd >= 0) { |
2844 | if (mddev->bitmap) | |
2845 | return -EEXIST; /* cannot add when bitmap is present */ | |
2846 | mddev->bitmap_file = fget(fd); | |
32a7627c | 2847 | |
36fa3063 N |
2848 | if (mddev->bitmap_file == NULL) { |
2849 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
2850 | mdname(mddev)); | |
2851 | return -EBADF; | |
2852 | } | |
2853 | ||
2854 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
2855 | if (err) { | |
2856 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
2857 | mdname(mddev)); | |
2858 | fput(mddev->bitmap_file); | |
2859 | mddev->bitmap_file = NULL; | |
2860 | return err; | |
2861 | } | |
a654b9d8 | 2862 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
2863 | } else if (mddev->bitmap == NULL) |
2864 | return -ENOENT; /* cannot remove what isn't there */ | |
2865 | err = 0; | |
2866 | if (mddev->pers) { | |
2867 | mddev->pers->quiesce(mddev, 1); | |
2868 | if (fd >= 0) | |
2869 | err = bitmap_create(mddev); | |
2870 | if (fd < 0 || err) | |
2871 | bitmap_destroy(mddev); | |
2872 | mddev->pers->quiesce(mddev, 0); | |
2873 | } else if (fd < 0) { | |
2874 | if (mddev->bitmap_file) | |
2875 | fput(mddev->bitmap_file); | |
2876 | mddev->bitmap_file = NULL; | |
2877 | } | |
2878 | ||
32a7627c N |
2879 | return err; |
2880 | } | |
2881 | ||
1da177e4 LT |
2882 | /* |
2883 | * set_array_info is used two different ways | |
2884 | * The original usage is when creating a new array. | |
2885 | * In this usage, raid_disks is > 0 and it together with | |
2886 | * level, size, not_persistent,layout,chunksize determine the | |
2887 | * shape of the array. | |
2888 | * This will always create an array with a type-0.90.0 superblock. | |
2889 | * The newer usage is when assembling an array. | |
2890 | * In this case raid_disks will be 0, and the major_version field is | |
2891 | * use to determine which style super-blocks are to be found on the devices. | |
2892 | * The minor and patch _version numbers are also kept incase the | |
2893 | * super_block handler wishes to interpret them. | |
2894 | */ | |
2895 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
2896 | { | |
2897 | ||
2898 | if (info->raid_disks == 0) { | |
2899 | /* just setting version number for superblock loading */ | |
2900 | if (info->major_version < 0 || | |
2901 | info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || | |
2902 | super_types[info->major_version].name == NULL) { | |
2903 | /* maybe try to auto-load a module? */ | |
2904 | printk(KERN_INFO | |
2905 | "md: superblock version %d not known\n", | |
2906 | info->major_version); | |
2907 | return -EINVAL; | |
2908 | } | |
2909 | mddev->major_version = info->major_version; | |
2910 | mddev->minor_version = info->minor_version; | |
2911 | mddev->patch_version = info->patch_version; | |
2912 | return 0; | |
2913 | } | |
2914 | mddev->major_version = MD_MAJOR_VERSION; | |
2915 | mddev->minor_version = MD_MINOR_VERSION; | |
2916 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
2917 | mddev->ctime = get_seconds(); | |
2918 | ||
2919 | mddev->level = info->level; | |
2920 | mddev->size = info->size; | |
2921 | mddev->raid_disks = info->raid_disks; | |
2922 | /* don't set md_minor, it is determined by which /dev/md* was | |
2923 | * openned | |
2924 | */ | |
2925 | if (info->state & (1<<MD_SB_CLEAN)) | |
2926 | mddev->recovery_cp = MaxSector; | |
2927 | else | |
2928 | mddev->recovery_cp = 0; | |
2929 | mddev->persistent = ! info->not_persistent; | |
2930 | ||
2931 | mddev->layout = info->layout; | |
2932 | mddev->chunk_size = info->chunk_size; | |
2933 | ||
2934 | mddev->max_disks = MD_SB_DISKS; | |
2935 | ||
2936 | mddev->sb_dirty = 1; | |
2937 | ||
b2a2703c N |
2938 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
2939 | mddev->bitmap_offset = 0; | |
2940 | ||
1da177e4 LT |
2941 | /* |
2942 | * Generate a 128 bit UUID | |
2943 | */ | |
2944 | get_random_bytes(mddev->uuid, 16); | |
2945 | ||
2946 | return 0; | |
2947 | } | |
2948 | ||
2949 | /* | |
2950 | * update_array_info is used to change the configuration of an | |
2951 | * on-line array. | |
2952 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
2953 | * fields in the info are checked against the array. | |
2954 | * Any differences that cannot be handled will cause an error. | |
2955 | * Normally, only one change can be managed at a time. | |
2956 | */ | |
2957 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
2958 | { | |
2959 | int rv = 0; | |
2960 | int cnt = 0; | |
36fa3063 N |
2961 | int state = 0; |
2962 | ||
2963 | /* calculate expected state,ignoring low bits */ | |
2964 | if (mddev->bitmap && mddev->bitmap_offset) | |
2965 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
2966 | |
2967 | if (mddev->major_version != info->major_version || | |
2968 | mddev->minor_version != info->minor_version || | |
2969 | /* mddev->patch_version != info->patch_version || */ | |
2970 | mddev->ctime != info->ctime || | |
2971 | mddev->level != info->level || | |
2972 | /* mddev->layout != info->layout || */ | |
2973 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
2974 | mddev->chunk_size != info->chunk_size || |
2975 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
2976 | ((state^info->state) & 0xfffffe00) | |
2977 | ) | |
1da177e4 LT |
2978 | return -EINVAL; |
2979 | /* Check there is only one change */ | |
2980 | if (mddev->size != info->size) cnt++; | |
2981 | if (mddev->raid_disks != info->raid_disks) cnt++; | |
2982 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 2983 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
2984 | if (cnt == 0) return 0; |
2985 | if (cnt > 1) return -EINVAL; | |
2986 | ||
2987 | if (mddev->layout != info->layout) { | |
2988 | /* Change layout | |
2989 | * we don't need to do anything at the md level, the | |
2990 | * personality will take care of it all. | |
2991 | */ | |
2992 | if (mddev->pers->reconfig == NULL) | |
2993 | return -EINVAL; | |
2994 | else | |
2995 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
2996 | } | |
2997 | if (mddev->size != info->size) { | |
2998 | mdk_rdev_t * rdev; | |
2999 | struct list_head *tmp; | |
3000 | if (mddev->pers->resize == NULL) | |
3001 | return -EINVAL; | |
3002 | /* The "size" is the amount of each device that is used. | |
3003 | * This can only make sense for arrays with redundancy. | |
3004 | * linear and raid0 always use whatever space is available | |
3005 | * We can only consider changing the size if no resync | |
3006 | * or reconstruction is happening, and if the new size | |
3007 | * is acceptable. It must fit before the sb_offset or, | |
3008 | * if that is <data_offset, it must fit before the | |
3009 | * size of each device. | |
3010 | * If size is zero, we find the largest size that fits. | |
3011 | */ | |
3012 | if (mddev->sync_thread) | |
3013 | return -EBUSY; | |
3014 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3015 | sector_t avail; | |
3016 | int fit = (info->size == 0); | |
3017 | if (rdev->sb_offset > rdev->data_offset) | |
3018 | avail = (rdev->sb_offset*2) - rdev->data_offset; | |
3019 | else | |
3020 | avail = get_capacity(rdev->bdev->bd_disk) | |
3021 | - rdev->data_offset; | |
3022 | if (fit && (info->size == 0 || info->size > avail/2)) | |
3023 | info->size = avail/2; | |
3024 | if (avail < ((sector_t)info->size << 1)) | |
3025 | return -ENOSPC; | |
3026 | } | |
3027 | rv = mddev->pers->resize(mddev, (sector_t)info->size *2); | |
3028 | if (!rv) { | |
3029 | struct block_device *bdev; | |
3030 | ||
3031 | bdev = bdget_disk(mddev->gendisk, 0); | |
3032 | if (bdev) { | |
3033 | down(&bdev->bd_inode->i_sem); | |
3034 | i_size_write(bdev->bd_inode, mddev->array_size << 10); | |
3035 | up(&bdev->bd_inode->i_sem); | |
3036 | bdput(bdev); | |
3037 | } | |
3038 | } | |
3039 | } | |
3040 | if (mddev->raid_disks != info->raid_disks) { | |
3041 | /* change the number of raid disks */ | |
3042 | if (mddev->pers->reshape == NULL) | |
3043 | return -EINVAL; | |
3044 | if (info->raid_disks <= 0 || | |
3045 | info->raid_disks >= mddev->max_disks) | |
3046 | return -EINVAL; | |
3047 | if (mddev->sync_thread) | |
3048 | return -EBUSY; | |
3049 | rv = mddev->pers->reshape(mddev, info->raid_disks); | |
3050 | if (!rv) { | |
3051 | struct block_device *bdev; | |
3052 | ||
3053 | bdev = bdget_disk(mddev->gendisk, 0); | |
3054 | if (bdev) { | |
3055 | down(&bdev->bd_inode->i_sem); | |
3056 | i_size_write(bdev->bd_inode, mddev->array_size << 10); | |
3057 | up(&bdev->bd_inode->i_sem); | |
3058 | bdput(bdev); | |
3059 | } | |
3060 | } | |
3061 | } | |
36fa3063 N |
3062 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
3063 | if (mddev->pers->quiesce == NULL) | |
3064 | return -EINVAL; | |
3065 | if (mddev->recovery || mddev->sync_thread) | |
3066 | return -EBUSY; | |
3067 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
3068 | /* add the bitmap */ | |
3069 | if (mddev->bitmap) | |
3070 | return -EEXIST; | |
3071 | if (mddev->default_bitmap_offset == 0) | |
3072 | return -EINVAL; | |
3073 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
3074 | mddev->pers->quiesce(mddev, 1); | |
3075 | rv = bitmap_create(mddev); | |
3076 | if (rv) | |
3077 | bitmap_destroy(mddev); | |
3078 | mddev->pers->quiesce(mddev, 0); | |
3079 | } else { | |
3080 | /* remove the bitmap */ | |
3081 | if (!mddev->bitmap) | |
3082 | return -ENOENT; | |
3083 | if (mddev->bitmap->file) | |
3084 | return -EINVAL; | |
3085 | mddev->pers->quiesce(mddev, 1); | |
3086 | bitmap_destroy(mddev); | |
3087 | mddev->pers->quiesce(mddev, 0); | |
3088 | mddev->bitmap_offset = 0; | |
3089 | } | |
3090 | } | |
1da177e4 LT |
3091 | md_update_sb(mddev); |
3092 | return rv; | |
3093 | } | |
3094 | ||
3095 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
3096 | { | |
3097 | mdk_rdev_t *rdev; | |
3098 | ||
3099 | if (mddev->pers == NULL) | |
3100 | return -ENODEV; | |
3101 | ||
3102 | rdev = find_rdev(mddev, dev); | |
3103 | if (!rdev) | |
3104 | return -ENODEV; | |
3105 | ||
3106 | md_error(mddev, rdev); | |
3107 | return 0; | |
3108 | } | |
3109 | ||
3110 | static int md_ioctl(struct inode *inode, struct file *file, | |
3111 | unsigned int cmd, unsigned long arg) | |
3112 | { | |
3113 | int err = 0; | |
3114 | void __user *argp = (void __user *)arg; | |
3115 | struct hd_geometry __user *loc = argp; | |
3116 | mddev_t *mddev = NULL; | |
3117 | ||
3118 | if (!capable(CAP_SYS_ADMIN)) | |
3119 | return -EACCES; | |
3120 | ||
3121 | /* | |
3122 | * Commands dealing with the RAID driver but not any | |
3123 | * particular array: | |
3124 | */ | |
3125 | switch (cmd) | |
3126 | { | |
3127 | case RAID_VERSION: | |
3128 | err = get_version(argp); | |
3129 | goto done; | |
3130 | ||
3131 | case PRINT_RAID_DEBUG: | |
3132 | err = 0; | |
3133 | md_print_devices(); | |
3134 | goto done; | |
3135 | ||
3136 | #ifndef MODULE | |
3137 | case RAID_AUTORUN: | |
3138 | err = 0; | |
3139 | autostart_arrays(arg); | |
3140 | goto done; | |
3141 | #endif | |
3142 | default:; | |
3143 | } | |
3144 | ||
3145 | /* | |
3146 | * Commands creating/starting a new array: | |
3147 | */ | |
3148 | ||
3149 | mddev = inode->i_bdev->bd_disk->private_data; | |
3150 | ||
3151 | if (!mddev) { | |
3152 | BUG(); | |
3153 | goto abort; | |
3154 | } | |
3155 | ||
3156 | ||
3157 | if (cmd == START_ARRAY) { | |
3158 | /* START_ARRAY doesn't need to lock the array as autostart_array | |
3159 | * does the locking, and it could even be a different array | |
3160 | */ | |
3161 | static int cnt = 3; | |
3162 | if (cnt > 0 ) { | |
3163 | printk(KERN_WARNING | |
3164 | "md: %s(pid %d) used deprecated START_ARRAY ioctl. " | |
e8a00334 | 3165 | "This will not be supported beyond July 2006\n", |
1da177e4 LT |
3166 | current->comm, current->pid); |
3167 | cnt--; | |
3168 | } | |
3169 | err = autostart_array(new_decode_dev(arg)); | |
3170 | if (err) { | |
3171 | printk(KERN_WARNING "md: autostart failed!\n"); | |
3172 | goto abort; | |
3173 | } | |
3174 | goto done; | |
3175 | } | |
3176 | ||
3177 | err = mddev_lock(mddev); | |
3178 | if (err) { | |
3179 | printk(KERN_INFO | |
3180 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
3181 | err, cmd); | |
3182 | goto abort; | |
3183 | } | |
3184 | ||
3185 | switch (cmd) | |
3186 | { | |
3187 | case SET_ARRAY_INFO: | |
3188 | { | |
3189 | mdu_array_info_t info; | |
3190 | if (!arg) | |
3191 | memset(&info, 0, sizeof(info)); | |
3192 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
3193 | err = -EFAULT; | |
3194 | goto abort_unlock; | |
3195 | } | |
3196 | if (mddev->pers) { | |
3197 | err = update_array_info(mddev, &info); | |
3198 | if (err) { | |
3199 | printk(KERN_WARNING "md: couldn't update" | |
3200 | " array info. %d\n", err); | |
3201 | goto abort_unlock; | |
3202 | } | |
3203 | goto done_unlock; | |
3204 | } | |
3205 | if (!list_empty(&mddev->disks)) { | |
3206 | printk(KERN_WARNING | |
3207 | "md: array %s already has disks!\n", | |
3208 | mdname(mddev)); | |
3209 | err = -EBUSY; | |
3210 | goto abort_unlock; | |
3211 | } | |
3212 | if (mddev->raid_disks) { | |
3213 | printk(KERN_WARNING | |
3214 | "md: array %s already initialised!\n", | |
3215 | mdname(mddev)); | |
3216 | err = -EBUSY; | |
3217 | goto abort_unlock; | |
3218 | } | |
3219 | err = set_array_info(mddev, &info); | |
3220 | if (err) { | |
3221 | printk(KERN_WARNING "md: couldn't set" | |
3222 | " array info. %d\n", err); | |
3223 | goto abort_unlock; | |
3224 | } | |
3225 | } | |
3226 | goto done_unlock; | |
3227 | ||
3228 | default:; | |
3229 | } | |
3230 | ||
3231 | /* | |
3232 | * Commands querying/configuring an existing array: | |
3233 | */ | |
32a7627c N |
3234 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3235 | * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ | |
3236 | if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
3237 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { | |
1da177e4 LT |
3238 | err = -ENODEV; |
3239 | goto abort_unlock; | |
3240 | } | |
3241 | ||
3242 | /* | |
3243 | * Commands even a read-only array can execute: | |
3244 | */ | |
3245 | switch (cmd) | |
3246 | { | |
3247 | case GET_ARRAY_INFO: | |
3248 | err = get_array_info(mddev, argp); | |
3249 | goto done_unlock; | |
3250 | ||
32a7627c | 3251 | case GET_BITMAP_FILE: |
87162a28 | 3252 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
3253 | goto done_unlock; |
3254 | ||
1da177e4 LT |
3255 | case GET_DISK_INFO: |
3256 | err = get_disk_info(mddev, argp); | |
3257 | goto done_unlock; | |
3258 | ||
3259 | case RESTART_ARRAY_RW: | |
3260 | err = restart_array(mddev); | |
3261 | goto done_unlock; | |
3262 | ||
3263 | case STOP_ARRAY: | |
3264 | err = do_md_stop (mddev, 0); | |
3265 | goto done_unlock; | |
3266 | ||
3267 | case STOP_ARRAY_RO: | |
3268 | err = do_md_stop (mddev, 1); | |
3269 | goto done_unlock; | |
3270 | ||
3271 | /* | |
3272 | * We have a problem here : there is no easy way to give a CHS | |
3273 | * virtual geometry. We currently pretend that we have a 2 heads | |
3274 | * 4 sectors (with a BIG number of cylinders...). This drives | |
3275 | * dosfs just mad... ;-) | |
3276 | */ | |
3277 | case HDIO_GETGEO: | |
3278 | if (!loc) { | |
3279 | err = -EINVAL; | |
3280 | goto abort_unlock; | |
3281 | } | |
3282 | err = put_user (2, (char __user *) &loc->heads); | |
3283 | if (err) | |
3284 | goto abort_unlock; | |
3285 | err = put_user (4, (char __user *) &loc->sectors); | |
3286 | if (err) | |
3287 | goto abort_unlock; | |
3288 | err = put_user(get_capacity(mddev->gendisk)/8, | |
3289 | (short __user *) &loc->cylinders); | |
3290 | if (err) | |
3291 | goto abort_unlock; | |
3292 | err = put_user (get_start_sect(inode->i_bdev), | |
3293 | (long __user *) &loc->start); | |
3294 | goto done_unlock; | |
3295 | } | |
3296 | ||
3297 | /* | |
3298 | * The remaining ioctls are changing the state of the | |
f91de92e N |
3299 | * superblock, so we do not allow them on read-only arrays. |
3300 | * However non-MD ioctls (e.g. get-size) will still come through | |
3301 | * here and hit the 'default' below, so only disallow | |
3302 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 3303 | */ |
f91de92e N |
3304 | if (_IOC_TYPE(cmd) == MD_MAJOR && |
3305 | mddev->ro && mddev->pers) { | |
3306 | if (mddev->ro == 2) { | |
3307 | mddev->ro = 0; | |
3308 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3309 | md_wakeup_thread(mddev->thread); | |
3310 | ||
3311 | } else { | |
3312 | err = -EROFS; | |
3313 | goto abort_unlock; | |
3314 | } | |
1da177e4 LT |
3315 | } |
3316 | ||
3317 | switch (cmd) | |
3318 | { | |
3319 | case ADD_NEW_DISK: | |
3320 | { | |
3321 | mdu_disk_info_t info; | |
3322 | if (copy_from_user(&info, argp, sizeof(info))) | |
3323 | err = -EFAULT; | |
3324 | else | |
3325 | err = add_new_disk(mddev, &info); | |
3326 | goto done_unlock; | |
3327 | } | |
3328 | ||
3329 | case HOT_REMOVE_DISK: | |
3330 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3331 | goto done_unlock; | |
3332 | ||
3333 | case HOT_ADD_DISK: | |
3334 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3335 | goto done_unlock; | |
3336 | ||
3337 | case SET_DISK_FAULTY: | |
3338 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3339 | goto done_unlock; | |
3340 | ||
3341 | case RUN_ARRAY: | |
3342 | err = do_md_run (mddev); | |
3343 | goto done_unlock; | |
3344 | ||
32a7627c N |
3345 | case SET_BITMAP_FILE: |
3346 | err = set_bitmap_file(mddev, (int)arg); | |
3347 | goto done_unlock; | |
3348 | ||
1da177e4 LT |
3349 | default: |
3350 | if (_IOC_TYPE(cmd) == MD_MAJOR) | |
3351 | printk(KERN_WARNING "md: %s(pid %d) used" | |
3352 | " obsolete MD ioctl, upgrade your" | |
3353 | " software to use new ictls.\n", | |
3354 | current->comm, current->pid); | |
3355 | err = -EINVAL; | |
3356 | goto abort_unlock; | |
3357 | } | |
3358 | ||
3359 | done_unlock: | |
3360 | abort_unlock: | |
3361 | mddev_unlock(mddev); | |
3362 | ||
3363 | return err; | |
3364 | done: | |
3365 | if (err) | |
3366 | MD_BUG(); | |
3367 | abort: | |
3368 | return err; | |
3369 | } | |
3370 | ||
3371 | static int md_open(struct inode *inode, struct file *file) | |
3372 | { | |
3373 | /* | |
3374 | * Succeed if we can lock the mddev, which confirms that | |
3375 | * it isn't being stopped right now. | |
3376 | */ | |
3377 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3378 | int err; | |
3379 | ||
3380 | if ((err = mddev_lock(mddev))) | |
3381 | goto out; | |
3382 | ||
3383 | err = 0; | |
3384 | mddev_get(mddev); | |
3385 | mddev_unlock(mddev); | |
3386 | ||
3387 | check_disk_change(inode->i_bdev); | |
3388 | out: | |
3389 | return err; | |
3390 | } | |
3391 | ||
3392 | static int md_release(struct inode *inode, struct file * file) | |
3393 | { | |
3394 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3395 | ||
3396 | if (!mddev) | |
3397 | BUG(); | |
3398 | mddev_put(mddev); | |
3399 | ||
3400 | return 0; | |
3401 | } | |
3402 | ||
3403 | static int md_media_changed(struct gendisk *disk) | |
3404 | { | |
3405 | mddev_t *mddev = disk->private_data; | |
3406 | ||
3407 | return mddev->changed; | |
3408 | } | |
3409 | ||
3410 | static int md_revalidate(struct gendisk *disk) | |
3411 | { | |
3412 | mddev_t *mddev = disk->private_data; | |
3413 | ||
3414 | mddev->changed = 0; | |
3415 | return 0; | |
3416 | } | |
3417 | static struct block_device_operations md_fops = | |
3418 | { | |
3419 | .owner = THIS_MODULE, | |
3420 | .open = md_open, | |
3421 | .release = md_release, | |
3422 | .ioctl = md_ioctl, | |
3423 | .media_changed = md_media_changed, | |
3424 | .revalidate_disk= md_revalidate, | |
3425 | }; | |
3426 | ||
75c96f85 | 3427 | static int md_thread(void * arg) |
1da177e4 LT |
3428 | { |
3429 | mdk_thread_t *thread = arg; | |
3430 | ||
1da177e4 LT |
3431 | /* |
3432 | * md_thread is a 'system-thread', it's priority should be very | |
3433 | * high. We avoid resource deadlocks individually in each | |
3434 | * raid personality. (RAID5 does preallocation) We also use RR and | |
3435 | * the very same RT priority as kswapd, thus we will never get | |
3436 | * into a priority inversion deadlock. | |
3437 | * | |
3438 | * we definitely have to have equal or higher priority than | |
3439 | * bdflush, otherwise bdflush will deadlock if there are too | |
3440 | * many dirty RAID5 blocks. | |
3441 | */ | |
1da177e4 | 3442 | |
6985c43f | 3443 | allow_signal(SIGKILL); |
a6fb0934 | 3444 | while (!kthread_should_stop()) { |
1da177e4 | 3445 | |
93588e22 N |
3446 | /* We need to wait INTERRUPTIBLE so that |
3447 | * we don't add to the load-average. | |
3448 | * That means we need to be sure no signals are | |
3449 | * pending | |
3450 | */ | |
3451 | if (signal_pending(current)) | |
3452 | flush_signals(current); | |
3453 | ||
3454 | wait_event_interruptible_timeout | |
3455 | (thread->wqueue, | |
3456 | test_bit(THREAD_WAKEUP, &thread->flags) | |
3457 | || kthread_should_stop(), | |
3458 | thread->timeout); | |
3e1d1d28 | 3459 | try_to_freeze(); |
1da177e4 LT |
3460 | |
3461 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
3462 | ||
787453c2 | 3463 | thread->run(thread->mddev); |
1da177e4 | 3464 | } |
a6fb0934 | 3465 | |
1da177e4 LT |
3466 | return 0; |
3467 | } | |
3468 | ||
3469 | void md_wakeup_thread(mdk_thread_t *thread) | |
3470 | { | |
3471 | if (thread) { | |
3472 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
3473 | set_bit(THREAD_WAKEUP, &thread->flags); | |
3474 | wake_up(&thread->wqueue); | |
3475 | } | |
3476 | } | |
3477 | ||
3478 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
3479 | const char *name) | |
3480 | { | |
3481 | mdk_thread_t *thread; | |
1da177e4 | 3482 | |
a6fb0934 | 3483 | thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
3484 | if (!thread) |
3485 | return NULL; | |
3486 | ||
3487 | memset(thread, 0, sizeof(mdk_thread_t)); | |
3488 | init_waitqueue_head(&thread->wqueue); | |
3489 | ||
1da177e4 LT |
3490 | thread->run = run; |
3491 | thread->mddev = mddev; | |
32a7627c | 3492 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 3493 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 3494 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
3495 | kfree(thread); |
3496 | return NULL; | |
3497 | } | |
1da177e4 LT |
3498 | return thread; |
3499 | } | |
3500 | ||
1da177e4 LT |
3501 | void md_unregister_thread(mdk_thread_t *thread) |
3502 | { | |
d28446fe | 3503 | dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); |
a6fb0934 N |
3504 | |
3505 | kthread_stop(thread->tsk); | |
1da177e4 LT |
3506 | kfree(thread); |
3507 | } | |
3508 | ||
3509 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
3510 | { | |
3511 | if (!mddev) { | |
3512 | MD_BUG(); | |
3513 | return; | |
3514 | } | |
3515 | ||
b2d444d7 | 3516 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3517 | return; |
32a7627c | 3518 | /* |
1da177e4 LT |
3519 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
3520 | mdname(mddev), | |
3521 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
3522 | __builtin_return_address(0),__builtin_return_address(1), | |
3523 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 3524 | */ |
1da177e4 LT |
3525 | if (!mddev->pers->error_handler) |
3526 | return; | |
3527 | mddev->pers->error_handler(mddev,rdev); | |
3528 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3529 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3530 | md_wakeup_thread(mddev->thread); | |
3531 | } | |
3532 | ||
3533 | /* seq_file implementation /proc/mdstat */ | |
3534 | ||
3535 | static void status_unused(struct seq_file *seq) | |
3536 | { | |
3537 | int i = 0; | |
3538 | mdk_rdev_t *rdev; | |
3539 | struct list_head *tmp; | |
3540 | ||
3541 | seq_printf(seq, "unused devices: "); | |
3542 | ||
3543 | ITERATE_RDEV_PENDING(rdev,tmp) { | |
3544 | char b[BDEVNAME_SIZE]; | |
3545 | i++; | |
3546 | seq_printf(seq, "%s ", | |
3547 | bdevname(rdev->bdev,b)); | |
3548 | } | |
3549 | if (!i) | |
3550 | seq_printf(seq, "<none>"); | |
3551 | ||
3552 | seq_printf(seq, "\n"); | |
3553 | } | |
3554 | ||
3555 | ||
3556 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
3557 | { | |
3558 | unsigned long max_blocks, resync, res, dt, db, rt; | |
3559 | ||
3560 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
3561 | ||
3562 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3563 | max_blocks = mddev->resync_max_sectors >> 1; | |
3564 | else | |
3565 | max_blocks = mddev->size; | |
3566 | ||
3567 | /* | |
3568 | * Should not happen. | |
3569 | */ | |
3570 | if (!max_blocks) { | |
3571 | MD_BUG(); | |
3572 | return; | |
3573 | } | |
3574 | res = (resync/1024)*1000/(max_blocks/1024 + 1); | |
3575 | { | |
3576 | int i, x = res/50, y = 20-x; | |
3577 | seq_printf(seq, "["); | |
3578 | for (i = 0; i < x; i++) | |
3579 | seq_printf(seq, "="); | |
3580 | seq_printf(seq, ">"); | |
3581 | for (i = 0; i < y; i++) | |
3582 | seq_printf(seq, "."); | |
3583 | seq_printf(seq, "] "); | |
3584 | } | |
3585 | seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", | |
3586 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
3587 | "resync" : "recovery"), | |
3588 | res/10, res % 10, resync, max_blocks); | |
3589 | ||
3590 | /* | |
3591 | * We do not want to overflow, so the order of operands and | |
3592 | * the * 100 / 100 trick are important. We do a +1 to be | |
3593 | * safe against division by zero. We only estimate anyway. | |
3594 | * | |
3595 | * dt: time from mark until now | |
3596 | * db: blocks written from mark until now | |
3597 | * rt: remaining time | |
3598 | */ | |
3599 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
3600 | if (!dt) dt++; | |
3601 | db = resync - (mddev->resync_mark_cnt/2); | |
3602 | rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; | |
3603 | ||
3604 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
3605 | ||
3606 | seq_printf(seq, " speed=%ldK/sec", db/dt); | |
3607 | } | |
3608 | ||
3609 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
3610 | { | |
3611 | struct list_head *tmp; | |
3612 | loff_t l = *pos; | |
3613 | mddev_t *mddev; | |
3614 | ||
3615 | if (l >= 0x10000) | |
3616 | return NULL; | |
3617 | if (!l--) | |
3618 | /* header */ | |
3619 | return (void*)1; | |
3620 | ||
3621 | spin_lock(&all_mddevs_lock); | |
3622 | list_for_each(tmp,&all_mddevs) | |
3623 | if (!l--) { | |
3624 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
3625 | mddev_get(mddev); | |
3626 | spin_unlock(&all_mddevs_lock); | |
3627 | return mddev; | |
3628 | } | |
3629 | spin_unlock(&all_mddevs_lock); | |
3630 | if (!l--) | |
3631 | return (void*)2;/* tail */ | |
3632 | return NULL; | |
3633 | } | |
3634 | ||
3635 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3636 | { | |
3637 | struct list_head *tmp; | |
3638 | mddev_t *next_mddev, *mddev = v; | |
3639 | ||
3640 | ++*pos; | |
3641 | if (v == (void*)2) | |
3642 | return NULL; | |
3643 | ||
3644 | spin_lock(&all_mddevs_lock); | |
3645 | if (v == (void*)1) | |
3646 | tmp = all_mddevs.next; | |
3647 | else | |
3648 | tmp = mddev->all_mddevs.next; | |
3649 | if (tmp != &all_mddevs) | |
3650 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
3651 | else { | |
3652 | next_mddev = (void*)2; | |
3653 | *pos = 0x10000; | |
3654 | } | |
3655 | spin_unlock(&all_mddevs_lock); | |
3656 | ||
3657 | if (v != (void*)1) | |
3658 | mddev_put(mddev); | |
3659 | return next_mddev; | |
3660 | ||
3661 | } | |
3662 | ||
3663 | static void md_seq_stop(struct seq_file *seq, void *v) | |
3664 | { | |
3665 | mddev_t *mddev = v; | |
3666 | ||
3667 | if (mddev && v != (void*)1 && v != (void*)2) | |
3668 | mddev_put(mddev); | |
3669 | } | |
3670 | ||
3671 | static int md_seq_show(struct seq_file *seq, void *v) | |
3672 | { | |
3673 | mddev_t *mddev = v; | |
3674 | sector_t size; | |
3675 | struct list_head *tmp2; | |
3676 | mdk_rdev_t *rdev; | |
3677 | int i; | |
32a7627c | 3678 | struct bitmap *bitmap; |
1da177e4 LT |
3679 | |
3680 | if (v == (void*)1) { | |
3681 | seq_printf(seq, "Personalities : "); | |
3682 | spin_lock(&pers_lock); | |
3683 | for (i = 0; i < MAX_PERSONALITY; i++) | |
3684 | if (pers[i]) | |
3685 | seq_printf(seq, "[%s] ", pers[i]->name); | |
3686 | ||
3687 | spin_unlock(&pers_lock); | |
3688 | seq_printf(seq, "\n"); | |
3689 | return 0; | |
3690 | } | |
3691 | if (v == (void*)2) { | |
3692 | status_unused(seq); | |
3693 | return 0; | |
3694 | } | |
3695 | ||
3696 | if (mddev_lock(mddev)!=0) | |
3697 | return -EINTR; | |
3698 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { | |
3699 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
3700 | mddev->pers ? "" : "in"); | |
3701 | if (mddev->pers) { | |
f91de92e | 3702 | if (mddev->ro==1) |
1da177e4 | 3703 | seq_printf(seq, " (read-only)"); |
f91de92e N |
3704 | if (mddev->ro==2) |
3705 | seq_printf(seq, "(auto-read-only)"); | |
1da177e4 LT |
3706 | seq_printf(seq, " %s", mddev->pers->name); |
3707 | } | |
3708 | ||
3709 | size = 0; | |
3710 | ITERATE_RDEV(mddev,rdev,tmp2) { | |
3711 | char b[BDEVNAME_SIZE]; | |
3712 | seq_printf(seq, " %s[%d]", | |
3713 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
3714 | if (test_bit(WriteMostly, &rdev->flags)) |
3715 | seq_printf(seq, "(W)"); | |
b2d444d7 | 3716 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
3717 | seq_printf(seq, "(F)"); |
3718 | continue; | |
b325a32e N |
3719 | } else if (rdev->raid_disk < 0) |
3720 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
3721 | size += rdev->size; |
3722 | } | |
3723 | ||
3724 | if (!list_empty(&mddev->disks)) { | |
3725 | if (mddev->pers) | |
3726 | seq_printf(seq, "\n %llu blocks", | |
3727 | (unsigned long long)mddev->array_size); | |
3728 | else | |
3729 | seq_printf(seq, "\n %llu blocks", | |
3730 | (unsigned long long)size); | |
3731 | } | |
1cd6bf19 N |
3732 | if (mddev->persistent) { |
3733 | if (mddev->major_version != 0 || | |
3734 | mddev->minor_version != 90) { | |
3735 | seq_printf(seq," super %d.%d", | |
3736 | mddev->major_version, | |
3737 | mddev->minor_version); | |
3738 | } | |
3739 | } else | |
3740 | seq_printf(seq, " super non-persistent"); | |
1da177e4 LT |
3741 | |
3742 | if (mddev->pers) { | |
3743 | mddev->pers->status (seq, mddev); | |
3744 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
3745 | if (mddev->pers->sync_request) { |
3746 | if (mddev->curr_resync > 2) { | |
3747 | status_resync (seq, mddev); | |
3748 | seq_printf(seq, "\n "); | |
3749 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
3750 | seq_printf(seq, "\tresync=DELAYED\n "); | |
3751 | else if (mddev->recovery_cp < MaxSector) | |
3752 | seq_printf(seq, "\tresync=PENDING\n "); | |
3753 | } | |
32a7627c N |
3754 | } else |
3755 | seq_printf(seq, "\n "); | |
3756 | ||
3757 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
3758 | unsigned long chunk_kb; |
3759 | unsigned long flags; | |
32a7627c N |
3760 | spin_lock_irqsave(&bitmap->lock, flags); |
3761 | chunk_kb = bitmap->chunksize >> 10; | |
3762 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
3763 | "%lu%s chunk", | |
3764 | bitmap->pages - bitmap->missing_pages, | |
3765 | bitmap->pages, | |
3766 | (bitmap->pages - bitmap->missing_pages) | |
3767 | << (PAGE_SHIFT - 10), | |
3768 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
3769 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
3770 | if (bitmap->file) { |
3771 | seq_printf(seq, ", file: "); | |
3772 | seq_path(seq, bitmap->file->f_vfsmnt, | |
3773 | bitmap->file->f_dentry," \t\n"); | |
32a7627c | 3774 | } |
78d742d8 | 3775 | |
32a7627c N |
3776 | seq_printf(seq, "\n"); |
3777 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
3778 | } |
3779 | ||
3780 | seq_printf(seq, "\n"); | |
3781 | } | |
3782 | mddev_unlock(mddev); | |
3783 | ||
3784 | return 0; | |
3785 | } | |
3786 | ||
3787 | static struct seq_operations md_seq_ops = { | |
3788 | .start = md_seq_start, | |
3789 | .next = md_seq_next, | |
3790 | .stop = md_seq_stop, | |
3791 | .show = md_seq_show, | |
3792 | }; | |
3793 | ||
3794 | static int md_seq_open(struct inode *inode, struct file *file) | |
3795 | { | |
3796 | int error; | |
3797 | ||
3798 | error = seq_open(file, &md_seq_ops); | |
3799 | return error; | |
3800 | } | |
3801 | ||
3802 | static struct file_operations md_seq_fops = { | |
3803 | .open = md_seq_open, | |
3804 | .read = seq_read, | |
3805 | .llseek = seq_lseek, | |
3806 | .release = seq_release, | |
3807 | }; | |
3808 | ||
3809 | int register_md_personality(int pnum, mdk_personality_t *p) | |
3810 | { | |
3811 | if (pnum >= MAX_PERSONALITY) { | |
3812 | printk(KERN_ERR | |
3813 | "md: tried to install personality %s as nr %d, but max is %lu\n", | |
3814 | p->name, pnum, MAX_PERSONALITY-1); | |
3815 | return -EINVAL; | |
3816 | } | |
3817 | ||
3818 | spin_lock(&pers_lock); | |
3819 | if (pers[pnum]) { | |
3820 | spin_unlock(&pers_lock); | |
1da177e4 LT |
3821 | return -EBUSY; |
3822 | } | |
3823 | ||
3824 | pers[pnum] = p; | |
3825 | printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum); | |
3826 | spin_unlock(&pers_lock); | |
3827 | return 0; | |
3828 | } | |
3829 | ||
3830 | int unregister_md_personality(int pnum) | |
3831 | { | |
a757e64c | 3832 | if (pnum >= MAX_PERSONALITY) |
1da177e4 | 3833 | return -EINVAL; |
1da177e4 LT |
3834 | |
3835 | printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name); | |
3836 | spin_lock(&pers_lock); | |
3837 | pers[pnum] = NULL; | |
3838 | spin_unlock(&pers_lock); | |
3839 | return 0; | |
3840 | } | |
3841 | ||
3842 | static int is_mddev_idle(mddev_t *mddev) | |
3843 | { | |
3844 | mdk_rdev_t * rdev; | |
3845 | struct list_head *tmp; | |
3846 | int idle; | |
3847 | unsigned long curr_events; | |
3848 | ||
3849 | idle = 1; | |
3850 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3851 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
a362357b JA |
3852 | curr_events = disk_stat_read(disk, sectors[0]) + |
3853 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 3854 | atomic_read(&disk->sync_io); |
c0e48521 N |
3855 | /* The difference between curr_events and last_events |
3856 | * will be affected by any new non-sync IO (making | |
3857 | * curr_events bigger) and any difference in the amount of | |
3858 | * in-flight syncio (making current_events bigger or smaller) | |
3859 | * The amount in-flight is currently limited to | |
3860 | * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6 | |
3861 | * which is at most 4096 sectors. | |
3862 | * These numbers are fairly fragile and should be made | |
3863 | * more robust, probably by enforcing the | |
3864 | * 'window size' that md_do_sync sort-of uses. | |
3865 | * | |
1da177e4 LT |
3866 | * Note: the following is an unsigned comparison. |
3867 | */ | |
c0e48521 | 3868 | if ((curr_events - rdev->last_events + 4096) > 8192) { |
1da177e4 LT |
3869 | rdev->last_events = curr_events; |
3870 | idle = 0; | |
3871 | } | |
3872 | } | |
3873 | return idle; | |
3874 | } | |
3875 | ||
3876 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
3877 | { | |
3878 | /* another "blocks" (512byte) blocks have been synced */ | |
3879 | atomic_sub(blocks, &mddev->recovery_active); | |
3880 | wake_up(&mddev->recovery_wait); | |
3881 | if (!ok) { | |
3882 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
3883 | md_wakeup_thread(mddev->thread); | |
3884 | // stop recovery, signal do_sync .... | |
3885 | } | |
3886 | } | |
3887 | ||
3888 | ||
06d91a5f N |
3889 | /* md_write_start(mddev, bi) |
3890 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
3891 | * in superblock) before writing, schedule a superblock update |
3892 | * and wait for it to complete. | |
06d91a5f | 3893 | */ |
3d310eb7 | 3894 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 3895 | { |
06d91a5f | 3896 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 3897 | return; |
06d91a5f | 3898 | |
f91de92e N |
3899 | BUG_ON(mddev->ro == 1); |
3900 | if (mddev->ro == 2) { | |
3901 | /* need to switch to read/write */ | |
3902 | mddev->ro = 0; | |
3903 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3904 | md_wakeup_thread(mddev->thread); | |
3905 | } | |
06d91a5f | 3906 | atomic_inc(&mddev->writes_pending); |
06d91a5f | 3907 | if (mddev->in_sync) { |
a9701a30 | 3908 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
3909 | if (mddev->in_sync) { |
3910 | mddev->in_sync = 0; | |
3911 | mddev->sb_dirty = 1; | |
3912 | md_wakeup_thread(mddev->thread); | |
3913 | } | |
a9701a30 | 3914 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 3915 | } |
3d310eb7 | 3916 | wait_event(mddev->sb_wait, mddev->sb_dirty==0); |
1da177e4 LT |
3917 | } |
3918 | ||
3919 | void md_write_end(mddev_t *mddev) | |
3920 | { | |
3921 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
3922 | if (mddev->safemode == 2) | |
3923 | md_wakeup_thread(mddev->thread); | |
3924 | else | |
3925 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); | |
3926 | } | |
3927 | } | |
3928 | ||
75c96f85 | 3929 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
3930 | |
3931 | #define SYNC_MARKS 10 | |
3932 | #define SYNC_MARK_STEP (3*HZ) | |
3933 | static void md_do_sync(mddev_t *mddev) | |
3934 | { | |
3935 | mddev_t *mddev2; | |
3936 | unsigned int currspeed = 0, | |
3937 | window; | |
57afd89f | 3938 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
3939 | unsigned long mark[SYNC_MARKS]; |
3940 | sector_t mark_cnt[SYNC_MARKS]; | |
3941 | int last_mark,m; | |
3942 | struct list_head *tmp; | |
3943 | sector_t last_check; | |
57afd89f | 3944 | int skipped = 0; |
1da177e4 LT |
3945 | |
3946 | /* just incase thread restarts... */ | |
3947 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
3948 | return; | |
3949 | ||
3950 | /* we overload curr_resync somewhat here. | |
3951 | * 0 == not engaged in resync at all | |
3952 | * 2 == checking that there is no conflict with another sync | |
3953 | * 1 == like 2, but have yielded to allow conflicting resync to | |
3954 | * commense | |
3955 | * other == active in resync - this many blocks | |
3956 | * | |
3957 | * Before starting a resync we must have set curr_resync to | |
3958 | * 2, and then checked that every "conflicting" array has curr_resync | |
3959 | * less than ours. When we find one that is the same or higher | |
3960 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
3961 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
3962 | * This will mean we have to start checking from the beginning again. | |
3963 | * | |
3964 | */ | |
3965 | ||
3966 | do { | |
3967 | mddev->curr_resync = 2; | |
3968 | ||
3969 | try_again: | |
787453c2 | 3970 | if (kthread_should_stop()) { |
6985c43f | 3971 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
3972 | goto skip; |
3973 | } | |
3974 | ITERATE_MDDEV(mddev2,tmp) { | |
1da177e4 LT |
3975 | if (mddev2 == mddev) |
3976 | continue; | |
3977 | if (mddev2->curr_resync && | |
3978 | match_mddev_units(mddev,mddev2)) { | |
3979 | DEFINE_WAIT(wq); | |
3980 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
3981 | /* arbitrarily yield */ | |
3982 | mddev->curr_resync = 1; | |
3983 | wake_up(&resync_wait); | |
3984 | } | |
3985 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
3986 | /* no need to wait here, we can wait the next | |
3987 | * time 'round when curr_resync == 2 | |
3988 | */ | |
3989 | continue; | |
787453c2 N |
3990 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
3991 | if (!kthread_should_stop() && | |
8712e553 | 3992 | mddev2->curr_resync >= mddev->curr_resync) { |
1da177e4 LT |
3993 | printk(KERN_INFO "md: delaying resync of %s" |
3994 | " until %s has finished resync (they" | |
3995 | " share one or more physical units)\n", | |
3996 | mdname(mddev), mdname(mddev2)); | |
3997 | mddev_put(mddev2); | |
3998 | schedule(); | |
3999 | finish_wait(&resync_wait, &wq); | |
4000 | goto try_again; | |
4001 | } | |
4002 | finish_wait(&resync_wait, &wq); | |
4003 | } | |
4004 | } | |
4005 | } while (mddev->curr_resync < 2); | |
4006 | ||
9d88883e | 4007 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 4008 | /* resync follows the size requested by the personality, |
57afd89f | 4009 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
4010 | */ |
4011 | max_sectors = mddev->resync_max_sectors; | |
9d88883e N |
4012 | mddev->resync_mismatches = 0; |
4013 | } else | |
1da177e4 LT |
4014 | /* recovery follows the physical size of devices */ |
4015 | max_sectors = mddev->size << 1; | |
4016 | ||
4017 | printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); | |
4018 | printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" | |
4019 | " %d KB/sec/disc.\n", sysctl_speed_limit_min); | |
338cec32 | 4020 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
1da177e4 LT |
4021 | "(but not more than %d KB/sec) for reconstruction.\n", |
4022 | sysctl_speed_limit_max); | |
4023 | ||
4024 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
32a7627c | 4025 | /* we don't use the checkpoint if there's a bitmap */ |
24dd469d N |
4026 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap |
4027 | && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1da177e4 LT |
4028 | j = mddev->recovery_cp; |
4029 | else | |
4030 | j = 0; | |
57afd89f | 4031 | io_sectors = 0; |
1da177e4 LT |
4032 | for (m = 0; m < SYNC_MARKS; m++) { |
4033 | mark[m] = jiffies; | |
57afd89f | 4034 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
4035 | } |
4036 | last_mark = 0; | |
4037 | mddev->resync_mark = mark[last_mark]; | |
4038 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
4039 | ||
4040 | /* | |
4041 | * Tune reconstruction: | |
4042 | */ | |
4043 | window = 32*(PAGE_SIZE/512); | |
4044 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
4045 | window/2,(unsigned long long) max_sectors/2); | |
4046 | ||
4047 | atomic_set(&mddev->recovery_active, 0); | |
4048 | init_waitqueue_head(&mddev->recovery_wait); | |
4049 | last_check = 0; | |
4050 | ||
4051 | if (j>2) { | |
4052 | printk(KERN_INFO | |
4053 | "md: resuming recovery of %s from checkpoint.\n", | |
4054 | mdname(mddev)); | |
4055 | mddev->curr_resync = j; | |
4056 | } | |
4057 | ||
4058 | while (j < max_sectors) { | |
57afd89f | 4059 | sector_t sectors; |
1da177e4 | 4060 | |
57afd89f N |
4061 | skipped = 0; |
4062 | sectors = mddev->pers->sync_request(mddev, j, &skipped, | |
4063 | currspeed < sysctl_speed_limit_min); | |
4064 | if (sectors == 0) { | |
1da177e4 LT |
4065 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
4066 | goto out; | |
4067 | } | |
57afd89f N |
4068 | |
4069 | if (!skipped) { /* actual IO requested */ | |
4070 | io_sectors += sectors; | |
4071 | atomic_add(sectors, &mddev->recovery_active); | |
4072 | } | |
4073 | ||
1da177e4 LT |
4074 | j += sectors; |
4075 | if (j>1) mddev->curr_resync = j; | |
4076 | ||
57afd89f N |
4077 | |
4078 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
4079 | continue; |
4080 | ||
57afd89f | 4081 | last_check = io_sectors; |
1da177e4 LT |
4082 | |
4083 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
4084 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
4085 | break; | |
4086 | ||
4087 | repeat: | |
4088 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
4089 | /* step marks */ | |
4090 | int next = (last_mark+1) % SYNC_MARKS; | |
4091 | ||
4092 | mddev->resync_mark = mark[next]; | |
4093 | mddev->resync_mark_cnt = mark_cnt[next]; | |
4094 | mark[next] = jiffies; | |
57afd89f | 4095 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
4096 | last_mark = next; |
4097 | } | |
4098 | ||
4099 | ||
787453c2 | 4100 | if (kthread_should_stop()) { |
1da177e4 LT |
4101 | /* |
4102 | * got a signal, exit. | |
4103 | */ | |
4104 | printk(KERN_INFO | |
4105 | "md: md_do_sync() got signal ... exiting\n"); | |
1da177e4 LT |
4106 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4107 | goto out; | |
4108 | } | |
4109 | ||
4110 | /* | |
4111 | * this loop exits only if either when we are slower than | |
4112 | * the 'hard' speed limit, or the system was IO-idle for | |
4113 | * a jiffy. | |
4114 | * the system might be non-idle CPU-wise, but we only care | |
4115 | * about not overloading the IO subsystem. (things like an | |
4116 | * e2fsck being done on the RAID array should execute fast) | |
4117 | */ | |
4118 | mddev->queue->unplug_fn(mddev->queue); | |
4119 | cond_resched(); | |
4120 | ||
57afd89f N |
4121 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
4122 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 LT |
4123 | |
4124 | if (currspeed > sysctl_speed_limit_min) { | |
4125 | if ((currspeed > sysctl_speed_limit_max) || | |
4126 | !is_mddev_idle(mddev)) { | |
c0e48521 | 4127 | msleep(500); |
1da177e4 LT |
4128 | goto repeat; |
4129 | } | |
4130 | } | |
4131 | } | |
4132 | printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); | |
4133 | /* | |
4134 | * this also signals 'finished resyncing' to md_stop | |
4135 | */ | |
4136 | out: | |
4137 | mddev->queue->unplug_fn(mddev->queue); | |
4138 | ||
4139 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
4140 | ||
4141 | /* tell personality that we are finished */ | |
57afd89f | 4142 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
4143 | |
4144 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4145 | mddev->curr_resync > 2 && | |
4146 | mddev->curr_resync >= mddev->recovery_cp) { | |
4147 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4148 | printk(KERN_INFO | |
4149 | "md: checkpointing recovery of %s.\n", | |
4150 | mdname(mddev)); | |
4151 | mddev->recovery_cp = mddev->curr_resync; | |
4152 | } else | |
4153 | mddev->recovery_cp = MaxSector; | |
4154 | } | |
4155 | ||
1da177e4 LT |
4156 | skip: |
4157 | mddev->curr_resync = 0; | |
4158 | wake_up(&resync_wait); | |
4159 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
4160 | md_wakeup_thread(mddev->thread); | |
4161 | } | |
4162 | ||
4163 | ||
4164 | /* | |
4165 | * This routine is regularly called by all per-raid-array threads to | |
4166 | * deal with generic issues like resync and super-block update. | |
4167 | * Raid personalities that don't have a thread (linear/raid0) do not | |
4168 | * need this as they never do any recovery or update the superblock. | |
4169 | * | |
4170 | * It does not do any resync itself, but rather "forks" off other threads | |
4171 | * to do that as needed. | |
4172 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
4173 | * "->recovery" and create a thread at ->sync_thread. | |
4174 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
4175 | * and wakeups up this thread which will reap the thread and finish up. | |
4176 | * This thread also removes any faulty devices (with nr_pending == 0). | |
4177 | * | |
4178 | * The overall approach is: | |
4179 | * 1/ if the superblock needs updating, update it. | |
4180 | * 2/ If a recovery thread is running, don't do anything else. | |
4181 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
4182 | * 4/ If there are any faulty devices, remove them. | |
4183 | * 5/ If array is degraded, try to add spares devices | |
4184 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
4185 | */ | |
4186 | void md_check_recovery(mddev_t *mddev) | |
4187 | { | |
4188 | mdk_rdev_t *rdev; | |
4189 | struct list_head *rtmp; | |
4190 | ||
4191 | ||
5f40402d N |
4192 | if (mddev->bitmap) |
4193 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
4194 | |
4195 | if (mddev->ro) | |
4196 | return; | |
fca4d848 N |
4197 | |
4198 | if (signal_pending(current)) { | |
4199 | if (mddev->pers->sync_request) { | |
4200 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
4201 | mdname(mddev)); | |
4202 | mddev->safemode = 2; | |
4203 | } | |
4204 | flush_signals(current); | |
4205 | } | |
4206 | ||
1da177e4 LT |
4207 | if ( ! ( |
4208 | mddev->sb_dirty || | |
4209 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || | |
fca4d848 N |
4210 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
4211 | (mddev->safemode == 1) || | |
4212 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
4213 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
4214 | )) |
4215 | return; | |
fca4d848 | 4216 | |
1da177e4 LT |
4217 | if (mddev_trylock(mddev)==0) { |
4218 | int spares =0; | |
fca4d848 | 4219 | |
a9701a30 | 4220 | spin_lock_irq(&mddev->write_lock); |
fca4d848 N |
4221 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
4222 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
4223 | mddev->in_sync = 1; | |
4224 | mddev->sb_dirty = 1; | |
4225 | } | |
4226 | if (mddev->safemode == 1) | |
4227 | mddev->safemode = 0; | |
a9701a30 | 4228 | spin_unlock_irq(&mddev->write_lock); |
fca4d848 | 4229 | |
1da177e4 LT |
4230 | if (mddev->sb_dirty) |
4231 | md_update_sb(mddev); | |
06d91a5f | 4232 | |
06d91a5f | 4233 | |
1da177e4 LT |
4234 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4235 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
4236 | /* resync/recovery still happening */ | |
4237 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4238 | goto unlock; | |
4239 | } | |
4240 | if (mddev->sync_thread) { | |
4241 | /* resync has finished, collect result */ | |
4242 | md_unregister_thread(mddev->sync_thread); | |
4243 | mddev->sync_thread = NULL; | |
4244 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4245 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4246 | /* success...*/ | |
4247 | /* activate any spares */ | |
4248 | mddev->pers->spare_active(mddev); | |
4249 | } | |
4250 | md_update_sb(mddev); | |
41158c7e N |
4251 | |
4252 | /* if array is no-longer degraded, then any saved_raid_disk | |
4253 | * information must be scrapped | |
4254 | */ | |
4255 | if (!mddev->degraded) | |
4256 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4257 | rdev->saved_raid_disk = -1; | |
4258 | ||
1da177e4 LT |
4259 | mddev->recovery = 0; |
4260 | /* flag recovery needed just to double check */ | |
4261 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4262 | goto unlock; | |
4263 | } | |
24dd469d N |
4264 | /* Clear some bits that don't mean anything, but |
4265 | * might be left set | |
4266 | */ | |
4267 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4268 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
4269 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4270 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 LT |
4271 | |
4272 | /* no recovery is running. | |
4273 | * remove any failed drives, then | |
4274 | * add spares if possible. | |
4275 | * Spare are also removed and re-added, to allow | |
4276 | * the personality to fail the re-add. | |
4277 | */ | |
4278 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4279 | if (rdev->raid_disk >= 0 && | |
b2d444d7 | 4280 | (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && |
1da177e4 | 4281 | atomic_read(&rdev->nr_pending)==0) { |
86e6ffdd N |
4282 | if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { |
4283 | char nm[20]; | |
4284 | sprintf(nm,"rd%d", rdev->raid_disk); | |
4285 | sysfs_remove_link(&mddev->kobj, nm); | |
1da177e4 | 4286 | rdev->raid_disk = -1; |
86e6ffdd | 4287 | } |
1da177e4 LT |
4288 | } |
4289 | ||
4290 | if (mddev->degraded) { | |
4291 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4292 | if (rdev->raid_disk < 0 | |
b2d444d7 | 4293 | && !test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
4294 | if (mddev->pers->hot_add_disk(mddev,rdev)) { |
4295 | char nm[20]; | |
4296 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4297 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
1da177e4 | 4298 | spares++; |
86e6ffdd | 4299 | } else |
1da177e4 LT |
4300 | break; |
4301 | } | |
4302 | } | |
4303 | ||
24dd469d N |
4304 | if (spares) { |
4305 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4306 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4307 | } else if (mddev->recovery_cp < MaxSector) { | |
4308 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4309 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4310 | /* nothing to be done ... */ | |
1da177e4 | 4311 | goto unlock; |
24dd469d | 4312 | |
1da177e4 LT |
4313 | if (mddev->pers->sync_request) { |
4314 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
4315 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
4316 | /* We are adding a device or devices to an array | |
4317 | * which has the bitmap stored on all devices. | |
4318 | * So make sure all bitmap pages get written | |
4319 | */ | |
4320 | bitmap_write_all(mddev->bitmap); | |
4321 | } | |
1da177e4 LT |
4322 | mddev->sync_thread = md_register_thread(md_do_sync, |
4323 | mddev, | |
4324 | "%s_resync"); | |
4325 | if (!mddev->sync_thread) { | |
4326 | printk(KERN_ERR "%s: could not start resync" | |
4327 | " thread...\n", | |
4328 | mdname(mddev)); | |
4329 | /* leave the spares where they are, it shouldn't hurt */ | |
4330 | mddev->recovery = 0; | |
4331 | } else { | |
4332 | md_wakeup_thread(mddev->sync_thread); | |
4333 | } | |
4334 | } | |
4335 | unlock: | |
4336 | mddev_unlock(mddev); | |
4337 | } | |
4338 | } | |
4339 | ||
75c96f85 AB |
4340 | static int md_notify_reboot(struct notifier_block *this, |
4341 | unsigned long code, void *x) | |
1da177e4 LT |
4342 | { |
4343 | struct list_head *tmp; | |
4344 | mddev_t *mddev; | |
4345 | ||
4346 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
4347 | ||
4348 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
4349 | ||
4350 | ITERATE_MDDEV(mddev,tmp) | |
4351 | if (mddev_trylock(mddev)==0) | |
4352 | do_md_stop (mddev, 1); | |
4353 | /* | |
4354 | * certain more exotic SCSI devices are known to be | |
4355 | * volatile wrt too early system reboots. While the | |
4356 | * right place to handle this issue is the given | |
4357 | * driver, we do want to have a safe RAID driver ... | |
4358 | */ | |
4359 | mdelay(1000*1); | |
4360 | } | |
4361 | return NOTIFY_DONE; | |
4362 | } | |
4363 | ||
75c96f85 | 4364 | static struct notifier_block md_notifier = { |
1da177e4 LT |
4365 | .notifier_call = md_notify_reboot, |
4366 | .next = NULL, | |
4367 | .priority = INT_MAX, /* before any real devices */ | |
4368 | }; | |
4369 | ||
4370 | static void md_geninit(void) | |
4371 | { | |
4372 | struct proc_dir_entry *p; | |
4373 | ||
4374 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
4375 | ||
4376 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
4377 | if (p) | |
4378 | p->proc_fops = &md_seq_fops; | |
4379 | } | |
4380 | ||
75c96f85 | 4381 | static int __init md_init(void) |
1da177e4 LT |
4382 | { |
4383 | int minor; | |
4384 | ||
4385 | printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," | |
4386 | " MD_SB_DISKS=%d\n", | |
4387 | MD_MAJOR_VERSION, MD_MINOR_VERSION, | |
4388 | MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); | |
bd926c63 | 4389 | printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, |
32a7627c | 4390 | BITMAP_MINOR); |
1da177e4 LT |
4391 | |
4392 | if (register_blkdev(MAJOR_NR, "md")) | |
4393 | return -1; | |
4394 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
4395 | unregister_blkdev(MAJOR_NR, "md"); | |
4396 | return -1; | |
4397 | } | |
4398 | devfs_mk_dir("md"); | |
4399 | blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, | |
4400 | md_probe, NULL, NULL); | |
4401 | blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, | |
4402 | md_probe, NULL, NULL); | |
4403 | ||
4404 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4405 | devfs_mk_bdev(MKDEV(MAJOR_NR, minor), | |
4406 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4407 | "md/%d", minor); | |
4408 | ||
4409 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4410 | devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), | |
4411 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4412 | "md/mdp%d", minor); | |
4413 | ||
4414 | ||
4415 | register_reboot_notifier(&md_notifier); | |
4416 | raid_table_header = register_sysctl_table(raid_root_table, 1); | |
4417 | ||
4418 | md_geninit(); | |
4419 | return (0); | |
4420 | } | |
4421 | ||
4422 | ||
4423 | #ifndef MODULE | |
4424 | ||
4425 | /* | |
4426 | * Searches all registered partitions for autorun RAID arrays | |
4427 | * at boot time. | |
4428 | */ | |
4429 | static dev_t detected_devices[128]; | |
4430 | static int dev_cnt; | |
4431 | ||
4432 | void md_autodetect_dev(dev_t dev) | |
4433 | { | |
4434 | if (dev_cnt >= 0 && dev_cnt < 127) | |
4435 | detected_devices[dev_cnt++] = dev; | |
4436 | } | |
4437 | ||
4438 | ||
4439 | static void autostart_arrays(int part) | |
4440 | { | |
4441 | mdk_rdev_t *rdev; | |
4442 | int i; | |
4443 | ||
4444 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); | |
4445 | ||
4446 | for (i = 0; i < dev_cnt; i++) { | |
4447 | dev_t dev = detected_devices[i]; | |
4448 | ||
4449 | rdev = md_import_device(dev,0, 0); | |
4450 | if (IS_ERR(rdev)) | |
4451 | continue; | |
4452 | ||
b2d444d7 | 4453 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4454 | MD_BUG(); |
4455 | continue; | |
4456 | } | |
4457 | list_add(&rdev->same_set, &pending_raid_disks); | |
4458 | } | |
4459 | dev_cnt = 0; | |
4460 | ||
4461 | autorun_devices(part); | |
4462 | } | |
4463 | ||
4464 | #endif | |
4465 | ||
4466 | static __exit void md_exit(void) | |
4467 | { | |
4468 | mddev_t *mddev; | |
4469 | struct list_head *tmp; | |
4470 | int i; | |
4471 | blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); | |
4472 | blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); | |
4473 | for (i=0; i < MAX_MD_DEVS; i++) | |
4474 | devfs_remove("md/%d", i); | |
4475 | for (i=0; i < MAX_MD_DEVS; i++) | |
4476 | devfs_remove("md/d%d", i); | |
4477 | ||
4478 | devfs_remove("md"); | |
4479 | ||
4480 | unregister_blkdev(MAJOR_NR,"md"); | |
4481 | unregister_blkdev(mdp_major, "mdp"); | |
4482 | unregister_reboot_notifier(&md_notifier); | |
4483 | unregister_sysctl_table(raid_table_header); | |
4484 | remove_proc_entry("mdstat", NULL); | |
4485 | ITERATE_MDDEV(mddev,tmp) { | |
4486 | struct gendisk *disk = mddev->gendisk; | |
4487 | if (!disk) | |
4488 | continue; | |
4489 | export_array(mddev); | |
4490 | del_gendisk(disk); | |
4491 | put_disk(disk); | |
4492 | mddev->gendisk = NULL; | |
4493 | mddev_put(mddev); | |
4494 | } | |
4495 | } | |
4496 | ||
4497 | module_init(md_init) | |
4498 | module_exit(md_exit) | |
4499 | ||
f91de92e N |
4500 | static int get_ro(char *buffer, struct kernel_param *kp) |
4501 | { | |
4502 | return sprintf(buffer, "%d", start_readonly); | |
4503 | } | |
4504 | static int set_ro(const char *val, struct kernel_param *kp) | |
4505 | { | |
4506 | char *e; | |
4507 | int num = simple_strtoul(val, &e, 10); | |
4508 | if (*val && (*e == '\0' || *e == '\n')) { | |
4509 | start_readonly = num; | |
4510 | return 0;; | |
4511 | } | |
4512 | return -EINVAL; | |
4513 | } | |
4514 | ||
4515 | module_param_call(start_ro, set_ro, get_ro, NULL, 0600); | |
6ff8d8ec N |
4516 | module_param(start_dirty_degraded, int, 0644); |
4517 | ||
f91de92e | 4518 | |
1da177e4 LT |
4519 | EXPORT_SYMBOL(register_md_personality); |
4520 | EXPORT_SYMBOL(unregister_md_personality); | |
4521 | EXPORT_SYMBOL(md_error); | |
4522 | EXPORT_SYMBOL(md_done_sync); | |
4523 | EXPORT_SYMBOL(md_write_start); | |
4524 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
4525 | EXPORT_SYMBOL(md_register_thread); |
4526 | EXPORT_SYMBOL(md_unregister_thread); | |
4527 | EXPORT_SYMBOL(md_wakeup_thread); | |
4528 | EXPORT_SYMBOL(md_print_devices); | |
4529 | EXPORT_SYMBOL(md_check_recovery); | |
4530 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 4531 | MODULE_ALIAS("md"); |
72008652 | 4532 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |