Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/config.h> | |
a6fb0934 | 37 | #include <linux/kthread.h> |
1da177e4 LT |
38 | #include <linux/linkage.h> |
39 | #include <linux/raid/md.h> | |
32a7627c | 40 | #include <linux/raid/bitmap.h> |
1da177e4 LT |
41 | #include <linux/sysctl.h> |
42 | #include <linux/devfs_fs_kernel.h> | |
43 | #include <linux/buffer_head.h> /* for invalidate_bdev */ | |
44 | #include <linux/suspend.h> | |
d7603b7e | 45 | #include <linux/poll.h> |
1da177e4 LT |
46 | |
47 | #include <linux/init.h> | |
48 | ||
32a7627c N |
49 | #include <linux/file.h> |
50 | ||
1da177e4 LT |
51 | #ifdef CONFIG_KMOD |
52 | #include <linux/kmod.h> | |
53 | #endif | |
54 | ||
55 | #include <asm/unaligned.h> | |
56 | ||
57 | #define MAJOR_NR MD_MAJOR | |
58 | #define MD_DRIVER | |
59 | ||
60 | /* 63 partitions with the alternate major number (mdp) */ | |
61 | #define MdpMinorShift 6 | |
62 | ||
63 | #define DEBUG 0 | |
64 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
65 | ||
66 | ||
67 | #ifndef MODULE | |
68 | static void autostart_arrays (int part); | |
69 | #endif | |
70 | ||
71 | static mdk_personality_t *pers[MAX_PERSONALITY]; | |
72 | static DEFINE_SPINLOCK(pers_lock); | |
73 | ||
74 | /* | |
75 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
76 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
77 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 78 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
79 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
80 | * speed limit - in case reconstruction slows down your system despite | |
81 | * idle IO detection. | |
82 | * | |
83 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
84 | */ | |
85 | ||
86 | static int sysctl_speed_limit_min = 1000; | |
87 | static int sysctl_speed_limit_max = 200000; | |
88 | ||
89 | static struct ctl_table_header *raid_table_header; | |
90 | ||
91 | static ctl_table raid_table[] = { | |
92 | { | |
93 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
94 | .procname = "speed_limit_min", | |
95 | .data = &sysctl_speed_limit_min, | |
96 | .maxlen = sizeof(int), | |
97 | .mode = 0644, | |
98 | .proc_handler = &proc_dointvec, | |
99 | }, | |
100 | { | |
101 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
102 | .procname = "speed_limit_max", | |
103 | .data = &sysctl_speed_limit_max, | |
104 | .maxlen = sizeof(int), | |
105 | .mode = 0644, | |
106 | .proc_handler = &proc_dointvec, | |
107 | }, | |
108 | { .ctl_name = 0 } | |
109 | }; | |
110 | ||
111 | static ctl_table raid_dir_table[] = { | |
112 | { | |
113 | .ctl_name = DEV_RAID, | |
114 | .procname = "raid", | |
115 | .maxlen = 0, | |
116 | .mode = 0555, | |
117 | .child = raid_table, | |
118 | }, | |
119 | { .ctl_name = 0 } | |
120 | }; | |
121 | ||
122 | static ctl_table raid_root_table[] = { | |
123 | { | |
124 | .ctl_name = CTL_DEV, | |
125 | .procname = "dev", | |
126 | .maxlen = 0, | |
127 | .mode = 0555, | |
128 | .child = raid_dir_table, | |
129 | }, | |
130 | { .ctl_name = 0 } | |
131 | }; | |
132 | ||
133 | static struct block_device_operations md_fops; | |
134 | ||
f91de92e N |
135 | static int start_readonly; |
136 | ||
d7603b7e N |
137 | /* |
138 | * We have a system wide 'event count' that is incremented | |
139 | * on any 'interesting' event, and readers of /proc/mdstat | |
140 | * can use 'poll' or 'select' to find out when the event | |
141 | * count increases. | |
142 | * | |
143 | * Events are: | |
144 | * start array, stop array, error, add device, remove device, | |
145 | * start build, activate spare | |
146 | */ | |
147 | DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); | |
148 | static atomic_t md_event_count; | |
149 | void md_new_event(mddev_t *mddev) | |
150 | { | |
151 | atomic_inc(&md_event_count); | |
152 | wake_up(&md_event_waiters); | |
153 | } | |
154 | ||
1da177e4 LT |
155 | /* |
156 | * Enables to iterate over all existing md arrays | |
157 | * all_mddevs_lock protects this list. | |
158 | */ | |
159 | static LIST_HEAD(all_mddevs); | |
160 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
161 | ||
162 | ||
163 | /* | |
164 | * iterates through all used mddevs in the system. | |
165 | * We take care to grab the all_mddevs_lock whenever navigating | |
166 | * the list, and to always hold a refcount when unlocked. | |
167 | * Any code which breaks out of this loop while own | |
168 | * a reference to the current mddev and must mddev_put it. | |
169 | */ | |
170 | #define ITERATE_MDDEV(mddev,tmp) \ | |
171 | \ | |
172 | for (({ spin_lock(&all_mddevs_lock); \ | |
173 | tmp = all_mddevs.next; \ | |
174 | mddev = NULL;}); \ | |
175 | ({ if (tmp != &all_mddevs) \ | |
176 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
177 | spin_unlock(&all_mddevs_lock); \ | |
178 | if (mddev) mddev_put(mddev); \ | |
179 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
180 | tmp != &all_mddevs;}); \ | |
181 | ({ spin_lock(&all_mddevs_lock); \ | |
182 | tmp = tmp->next;}) \ | |
183 | ) | |
184 | ||
185 | ||
186 | static int md_fail_request (request_queue_t *q, struct bio *bio) | |
187 | { | |
188 | bio_io_error(bio, bio->bi_size); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
193 | { | |
194 | atomic_inc(&mddev->active); | |
195 | return mddev; | |
196 | } | |
197 | ||
198 | static void mddev_put(mddev_t *mddev) | |
199 | { | |
200 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
201 | return; | |
202 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
203 | list_del(&mddev->all_mddevs); | |
204 | blk_put_queue(mddev->queue); | |
eae1701f | 205 | kobject_unregister(&mddev->kobj); |
1da177e4 LT |
206 | } |
207 | spin_unlock(&all_mddevs_lock); | |
208 | } | |
209 | ||
210 | static mddev_t * mddev_find(dev_t unit) | |
211 | { | |
212 | mddev_t *mddev, *new = NULL; | |
213 | ||
214 | retry: | |
215 | spin_lock(&all_mddevs_lock); | |
216 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
217 | if (mddev->unit == unit) { | |
218 | mddev_get(mddev); | |
219 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 220 | kfree(new); |
1da177e4 LT |
221 | return mddev; |
222 | } | |
223 | ||
224 | if (new) { | |
225 | list_add(&new->all_mddevs, &all_mddevs); | |
226 | spin_unlock(&all_mddevs_lock); | |
227 | return new; | |
228 | } | |
229 | spin_unlock(&all_mddevs_lock); | |
230 | ||
231 | new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL); | |
232 | if (!new) | |
233 | return NULL; | |
234 | ||
235 | memset(new, 0, sizeof(*new)); | |
236 | ||
237 | new->unit = unit; | |
238 | if (MAJOR(unit) == MD_MAJOR) | |
239 | new->md_minor = MINOR(unit); | |
240 | else | |
241 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
242 | ||
243 | init_MUTEX(&new->reconfig_sem); | |
244 | INIT_LIST_HEAD(&new->disks); | |
245 | INIT_LIST_HEAD(&new->all_mddevs); | |
246 | init_timer(&new->safemode_timer); | |
247 | atomic_set(&new->active, 1); | |
06d91a5f | 248 | spin_lock_init(&new->write_lock); |
3d310eb7 | 249 | init_waitqueue_head(&new->sb_wait); |
1da177e4 LT |
250 | |
251 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
252 | if (!new->queue) { | |
253 | kfree(new); | |
254 | return NULL; | |
255 | } | |
256 | ||
257 | blk_queue_make_request(new->queue, md_fail_request); | |
258 | ||
259 | goto retry; | |
260 | } | |
261 | ||
262 | static inline int mddev_lock(mddev_t * mddev) | |
263 | { | |
264 | return down_interruptible(&mddev->reconfig_sem); | |
265 | } | |
266 | ||
267 | static inline void mddev_lock_uninterruptible(mddev_t * mddev) | |
268 | { | |
269 | down(&mddev->reconfig_sem); | |
270 | } | |
271 | ||
272 | static inline int mddev_trylock(mddev_t * mddev) | |
273 | { | |
274 | return down_trylock(&mddev->reconfig_sem); | |
275 | } | |
276 | ||
277 | static inline void mddev_unlock(mddev_t * mddev) | |
278 | { | |
279 | up(&mddev->reconfig_sem); | |
280 | ||
005eca5e | 281 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
282 | } |
283 | ||
284 | mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) | |
285 | { | |
286 | mdk_rdev_t * rdev; | |
287 | struct list_head *tmp; | |
288 | ||
289 | ITERATE_RDEV(mddev,rdev,tmp) { | |
290 | if (rdev->desc_nr == nr) | |
291 | return rdev; | |
292 | } | |
293 | return NULL; | |
294 | } | |
295 | ||
296 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
297 | { | |
298 | struct list_head *tmp; | |
299 | mdk_rdev_t *rdev; | |
300 | ||
301 | ITERATE_RDEV(mddev,rdev,tmp) { | |
302 | if (rdev->bdev->bd_dev == dev) | |
303 | return rdev; | |
304 | } | |
305 | return NULL; | |
306 | } | |
307 | ||
77933d72 | 308 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 LT |
309 | { |
310 | sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
311 | return MD_NEW_SIZE_BLOCKS(size); | |
312 | } | |
313 | ||
314 | static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) | |
315 | { | |
316 | sector_t size; | |
317 | ||
318 | size = rdev->sb_offset; | |
319 | ||
320 | if (chunk_size) | |
321 | size &= ~((sector_t)chunk_size/1024 - 1); | |
322 | return size; | |
323 | } | |
324 | ||
325 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
326 | { | |
327 | if (rdev->sb_page) | |
328 | MD_BUG(); | |
329 | ||
330 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
331 | if (!rdev->sb_page) { | |
332 | printk(KERN_ALERT "md: out of memory.\n"); | |
333 | return -EINVAL; | |
334 | } | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
339 | static void free_disk_sb(mdk_rdev_t * rdev) | |
340 | { | |
341 | if (rdev->sb_page) { | |
2d1f3b5d | 342 | put_page(rdev->sb_page); |
1da177e4 LT |
343 | rdev->sb_loaded = 0; |
344 | rdev->sb_page = NULL; | |
345 | rdev->sb_offset = 0; | |
346 | rdev->size = 0; | |
347 | } | |
348 | } | |
349 | ||
350 | ||
7bfa19f2 N |
351 | static int super_written(struct bio *bio, unsigned int bytes_done, int error) |
352 | { | |
353 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 354 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 N |
355 | if (bio->bi_size) |
356 | return 1; | |
357 | ||
358 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
a9701a30 | 359 | md_error(mddev, rdev); |
7bfa19f2 | 360 | |
a9701a30 N |
361 | if (atomic_dec_and_test(&mddev->pending_writes)) |
362 | wake_up(&mddev->sb_wait); | |
f8b58edf | 363 | bio_put(bio); |
7bfa19f2 N |
364 | return 0; |
365 | } | |
366 | ||
a9701a30 N |
367 | static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) |
368 | { | |
369 | struct bio *bio2 = bio->bi_private; | |
370 | mdk_rdev_t *rdev = bio2->bi_private; | |
371 | mddev_t *mddev = rdev->mddev; | |
372 | if (bio->bi_size) | |
373 | return 1; | |
374 | ||
375 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
376 | error == -EOPNOTSUPP) { | |
377 | unsigned long flags; | |
378 | /* barriers don't appear to be supported :-( */ | |
379 | set_bit(BarriersNotsupp, &rdev->flags); | |
380 | mddev->barriers_work = 0; | |
381 | spin_lock_irqsave(&mddev->write_lock, flags); | |
382 | bio2->bi_next = mddev->biolist; | |
383 | mddev->biolist = bio2; | |
384 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
385 | wake_up(&mddev->sb_wait); | |
386 | bio_put(bio); | |
387 | return 0; | |
388 | } | |
389 | bio_put(bio2); | |
390 | bio->bi_private = rdev; | |
391 | return super_written(bio, bytes_done, error); | |
392 | } | |
393 | ||
7bfa19f2 N |
394 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
395 | sector_t sector, int size, struct page *page) | |
396 | { | |
397 | /* write first size bytes of page to sector of rdev | |
398 | * Increment mddev->pending_writes before returning | |
399 | * and decrement it on completion, waking up sb_wait | |
400 | * if zero is reached. | |
401 | * If an error occurred, call md_error | |
a9701a30 N |
402 | * |
403 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
404 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
405 | */ |
406 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 407 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
408 | |
409 | bio->bi_bdev = rdev->bdev; | |
410 | bio->bi_sector = sector; | |
411 | bio_add_page(bio, page, size, 0); | |
412 | bio->bi_private = rdev; | |
413 | bio->bi_end_io = super_written; | |
a9701a30 N |
414 | bio->bi_rw = rw; |
415 | ||
7bfa19f2 | 416 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
417 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
418 | struct bio *rbio; | |
419 | rw |= (1<<BIO_RW_BARRIER); | |
420 | rbio = bio_clone(bio, GFP_NOIO); | |
421 | rbio->bi_private = bio; | |
422 | rbio->bi_end_io = super_written_barrier; | |
423 | submit_bio(rw, rbio); | |
424 | } else | |
425 | submit_bio(rw, bio); | |
426 | } | |
427 | ||
428 | void md_super_wait(mddev_t *mddev) | |
429 | { | |
430 | /* wait for all superblock writes that were scheduled to complete. | |
431 | * if any had to be retried (due to BARRIER problems), retry them | |
432 | */ | |
433 | DEFINE_WAIT(wq); | |
434 | for(;;) { | |
435 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
436 | if (atomic_read(&mddev->pending_writes)==0) | |
437 | break; | |
438 | while (mddev->biolist) { | |
439 | struct bio *bio; | |
440 | spin_lock_irq(&mddev->write_lock); | |
441 | bio = mddev->biolist; | |
442 | mddev->biolist = bio->bi_next ; | |
443 | bio->bi_next = NULL; | |
444 | spin_unlock_irq(&mddev->write_lock); | |
445 | submit_bio(bio->bi_rw, bio); | |
446 | } | |
447 | schedule(); | |
448 | } | |
449 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
450 | } |
451 | ||
1da177e4 LT |
452 | static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) |
453 | { | |
454 | if (bio->bi_size) | |
455 | return 1; | |
456 | ||
457 | complete((struct completion*)bio->bi_private); | |
458 | return 0; | |
459 | } | |
460 | ||
a654b9d8 | 461 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
462 | struct page *page, int rw) |
463 | { | |
baaa2c51 | 464 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
465 | struct completion event; |
466 | int ret; | |
467 | ||
468 | rw |= (1 << BIO_RW_SYNC); | |
469 | ||
470 | bio->bi_bdev = bdev; | |
471 | bio->bi_sector = sector; | |
472 | bio_add_page(bio, page, size, 0); | |
473 | init_completion(&event); | |
474 | bio->bi_private = &event; | |
475 | bio->bi_end_io = bi_complete; | |
476 | submit_bio(rw, bio); | |
477 | wait_for_completion(&event); | |
478 | ||
479 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
480 | bio_put(bio); | |
481 | return ret; | |
482 | } | |
ddaf22ab | 483 | EXPORT_SYMBOL(sync_page_io); |
1da177e4 | 484 | |
0002b271 | 485 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
486 | { |
487 | char b[BDEVNAME_SIZE]; | |
488 | if (!rdev->sb_page) { | |
489 | MD_BUG(); | |
490 | return -EINVAL; | |
491 | } | |
492 | if (rdev->sb_loaded) | |
493 | return 0; | |
494 | ||
495 | ||
0002b271 | 496 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
497 | goto fail; |
498 | rdev->sb_loaded = 1; | |
499 | return 0; | |
500 | ||
501 | fail: | |
502 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
503 | bdevname(rdev->bdev,b)); | |
504 | return -EINVAL; | |
505 | } | |
506 | ||
507 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
508 | { | |
509 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
510 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
511 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
512 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
513 | ||
514 | return 1; | |
515 | ||
516 | return 0; | |
517 | } | |
518 | ||
519 | ||
520 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
521 | { | |
522 | int ret; | |
523 | mdp_super_t *tmp1, *tmp2; | |
524 | ||
525 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
526 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
527 | ||
528 | if (!tmp1 || !tmp2) { | |
529 | ret = 0; | |
530 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
531 | goto abort; | |
532 | } | |
533 | ||
534 | *tmp1 = *sb1; | |
535 | *tmp2 = *sb2; | |
536 | ||
537 | /* | |
538 | * nr_disks is not constant | |
539 | */ | |
540 | tmp1->nr_disks = 0; | |
541 | tmp2->nr_disks = 0; | |
542 | ||
543 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
544 | ret = 0; | |
545 | else | |
546 | ret = 1; | |
547 | ||
548 | abort: | |
990a8baf JJ |
549 | kfree(tmp1); |
550 | kfree(tmp2); | |
1da177e4 LT |
551 | return ret; |
552 | } | |
553 | ||
554 | static unsigned int calc_sb_csum(mdp_super_t * sb) | |
555 | { | |
556 | unsigned int disk_csum, csum; | |
557 | ||
558 | disk_csum = sb->sb_csum; | |
559 | sb->sb_csum = 0; | |
560 | csum = csum_partial((void *)sb, MD_SB_BYTES, 0); | |
561 | sb->sb_csum = disk_csum; | |
562 | return csum; | |
563 | } | |
564 | ||
565 | ||
566 | /* | |
567 | * Handle superblock details. | |
568 | * We want to be able to handle multiple superblock formats | |
569 | * so we have a common interface to them all, and an array of | |
570 | * different handlers. | |
571 | * We rely on user-space to write the initial superblock, and support | |
572 | * reading and updating of superblocks. | |
573 | * Interface methods are: | |
574 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
575 | * loads and validates a superblock on dev. | |
576 | * if refdev != NULL, compare superblocks on both devices | |
577 | * Return: | |
578 | * 0 - dev has a superblock that is compatible with refdev | |
579 | * 1 - dev has a superblock that is compatible and newer than refdev | |
580 | * so dev should be used as the refdev in future | |
581 | * -EINVAL superblock incompatible or invalid | |
582 | * -othererror e.g. -EIO | |
583 | * | |
584 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
585 | * Verify that dev is acceptable into mddev. | |
586 | * The first time, mddev->raid_disks will be 0, and data from | |
587 | * dev should be merged in. Subsequent calls check that dev | |
588 | * is new enough. Return 0 or -EINVAL | |
589 | * | |
590 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
591 | * Update the superblock for rdev with data in mddev | |
592 | * This does not write to disc. | |
593 | * | |
594 | */ | |
595 | ||
596 | struct super_type { | |
597 | char *name; | |
598 | struct module *owner; | |
599 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
600 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
601 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
602 | }; | |
603 | ||
604 | /* | |
605 | * load_super for 0.90.0 | |
606 | */ | |
607 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
608 | { | |
609 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
610 | mdp_super_t *sb; | |
611 | int ret; | |
612 | sector_t sb_offset; | |
613 | ||
614 | /* | |
615 | * Calculate the position of the superblock, | |
616 | * it's at the end of the disk. | |
617 | * | |
618 | * It also happens to be a multiple of 4Kb. | |
619 | */ | |
620 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
621 | rdev->sb_offset = sb_offset; | |
622 | ||
0002b271 | 623 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
624 | if (ret) return ret; |
625 | ||
626 | ret = -EINVAL; | |
627 | ||
628 | bdevname(rdev->bdev, b); | |
629 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
630 | ||
631 | if (sb->md_magic != MD_SB_MAGIC) { | |
632 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
633 | b); | |
634 | goto abort; | |
635 | } | |
636 | ||
637 | if (sb->major_version != 0 || | |
638 | sb->minor_version != 90) { | |
639 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", | |
640 | sb->major_version, sb->minor_version, | |
641 | b); | |
642 | goto abort; | |
643 | } | |
644 | ||
645 | if (sb->raid_disks <= 0) | |
646 | goto abort; | |
647 | ||
648 | if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) { | |
649 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", | |
650 | b); | |
651 | goto abort; | |
652 | } | |
653 | ||
654 | rdev->preferred_minor = sb->md_minor; | |
655 | rdev->data_offset = 0; | |
0002b271 | 656 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
657 | |
658 | if (sb->level == LEVEL_MULTIPATH) | |
659 | rdev->desc_nr = -1; | |
660 | else | |
661 | rdev->desc_nr = sb->this_disk.number; | |
662 | ||
663 | if (refdev == 0) | |
664 | ret = 1; | |
665 | else { | |
666 | __u64 ev1, ev2; | |
667 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
668 | if (!uuid_equal(refsb, sb)) { | |
669 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
670 | b, bdevname(refdev->bdev,b2)); | |
671 | goto abort; | |
672 | } | |
673 | if (!sb_equal(refsb, sb)) { | |
674 | printk(KERN_WARNING "md: %s has same UUID" | |
675 | " but different superblock to %s\n", | |
676 | b, bdevname(refdev->bdev, b2)); | |
677 | goto abort; | |
678 | } | |
679 | ev1 = md_event(sb); | |
680 | ev2 = md_event(refsb); | |
681 | if (ev1 > ev2) | |
682 | ret = 1; | |
683 | else | |
684 | ret = 0; | |
685 | } | |
686 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
687 | ||
688 | abort: | |
689 | return ret; | |
690 | } | |
691 | ||
692 | /* | |
693 | * validate_super for 0.90.0 | |
694 | */ | |
695 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
696 | { | |
697 | mdp_disk_t *desc; | |
698 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
699 | ||
41158c7e | 700 | rdev->raid_disk = -1; |
b2d444d7 | 701 | rdev->flags = 0; |
1da177e4 LT |
702 | if (mddev->raid_disks == 0) { |
703 | mddev->major_version = 0; | |
704 | mddev->minor_version = sb->minor_version; | |
705 | mddev->patch_version = sb->patch_version; | |
706 | mddev->persistent = ! sb->not_persistent; | |
707 | mddev->chunk_size = sb->chunk_size; | |
708 | mddev->ctime = sb->ctime; | |
709 | mddev->utime = sb->utime; | |
710 | mddev->level = sb->level; | |
711 | mddev->layout = sb->layout; | |
712 | mddev->raid_disks = sb->raid_disks; | |
713 | mddev->size = sb->size; | |
714 | mddev->events = md_event(sb); | |
9223214e | 715 | mddev->bitmap_offset = 0; |
36fa3063 | 716 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 LT |
717 | |
718 | if (sb->state & (1<<MD_SB_CLEAN)) | |
719 | mddev->recovery_cp = MaxSector; | |
720 | else { | |
721 | if (sb->events_hi == sb->cp_events_hi && | |
722 | sb->events_lo == sb->cp_events_lo) { | |
723 | mddev->recovery_cp = sb->recovery_cp; | |
724 | } else | |
725 | mddev->recovery_cp = 0; | |
726 | } | |
727 | ||
728 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
729 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
730 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
731 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
732 | ||
733 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
734 | |
735 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
736 | mddev->bitmap_file == NULL) { | |
6cce3b23 N |
737 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 |
738 | && mddev->level != 10) { | |
a654b9d8 | 739 | /* FIXME use a better test */ |
6cce3b23 | 740 | printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); |
a654b9d8 N |
741 | return -EINVAL; |
742 | } | |
36fa3063 | 743 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 N |
744 | } |
745 | ||
41158c7e N |
746 | } else if (mddev->pers == NULL) { |
747 | /* Insist on good event counter while assembling */ | |
748 | __u64 ev1 = md_event(sb); | |
1da177e4 LT |
749 | ++ev1; |
750 | if (ev1 < mddev->events) | |
751 | return -EINVAL; | |
41158c7e N |
752 | } else if (mddev->bitmap) { |
753 | /* if adding to array with a bitmap, then we can accept an | |
754 | * older device ... but not too old. | |
755 | */ | |
756 | __u64 ev1 = md_event(sb); | |
757 | if (ev1 < mddev->bitmap->events_cleared) | |
758 | return 0; | |
759 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
760 | return 0; | |
761 | ||
1da177e4 | 762 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
763 | desc = sb->disks + rdev->desc_nr; |
764 | ||
765 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 766 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
767 | else if (desc->state & (1<<MD_DISK_SYNC) && |
768 | desc->raid_disk < mddev->raid_disks) { | |
b2d444d7 | 769 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
770 | rdev->raid_disk = desc->raid_disk; |
771 | } | |
8ddf9efe N |
772 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
773 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 774 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 775 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
776 | return 0; |
777 | } | |
778 | ||
779 | /* | |
780 | * sync_super for 0.90.0 | |
781 | */ | |
782 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
783 | { | |
784 | mdp_super_t *sb; | |
785 | struct list_head *tmp; | |
786 | mdk_rdev_t *rdev2; | |
787 | int next_spare = mddev->raid_disks; | |
19133a42 | 788 | |
1da177e4 LT |
789 | |
790 | /* make rdev->sb match mddev data.. | |
791 | * | |
792 | * 1/ zero out disks | |
793 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
794 | * 3/ any empty disks < next_spare become removed | |
795 | * | |
796 | * disks[0] gets initialised to REMOVED because | |
797 | * we cannot be sure from other fields if it has | |
798 | * been initialised or not. | |
799 | */ | |
800 | int i; | |
801 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
802 | ||
61181565 N |
803 | rdev->sb_size = MD_SB_BYTES; |
804 | ||
1da177e4 LT |
805 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
806 | ||
807 | memset(sb, 0, sizeof(*sb)); | |
808 | ||
809 | sb->md_magic = MD_SB_MAGIC; | |
810 | sb->major_version = mddev->major_version; | |
811 | sb->minor_version = mddev->minor_version; | |
812 | sb->patch_version = mddev->patch_version; | |
813 | sb->gvalid_words = 0; /* ignored */ | |
814 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
815 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
816 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
817 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
818 | ||
819 | sb->ctime = mddev->ctime; | |
820 | sb->level = mddev->level; | |
821 | sb->size = mddev->size; | |
822 | sb->raid_disks = mddev->raid_disks; | |
823 | sb->md_minor = mddev->md_minor; | |
824 | sb->not_persistent = !mddev->persistent; | |
825 | sb->utime = mddev->utime; | |
826 | sb->state = 0; | |
827 | sb->events_hi = (mddev->events>>32); | |
828 | sb->events_lo = (u32)mddev->events; | |
829 | ||
830 | if (mddev->in_sync) | |
831 | { | |
832 | sb->recovery_cp = mddev->recovery_cp; | |
833 | sb->cp_events_hi = (mddev->events>>32); | |
834 | sb->cp_events_lo = (u32)mddev->events; | |
835 | if (mddev->recovery_cp == MaxSector) | |
836 | sb->state = (1<< MD_SB_CLEAN); | |
837 | } else | |
838 | sb->recovery_cp = 0; | |
839 | ||
840 | sb->layout = mddev->layout; | |
841 | sb->chunk_size = mddev->chunk_size; | |
842 | ||
a654b9d8 N |
843 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
844 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
845 | ||
1da177e4 LT |
846 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
847 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
848 | mdp_disk_t *d; | |
86e6ffdd | 849 | int desc_nr; |
b2d444d7 N |
850 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
851 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 852 | desc_nr = rdev2->raid_disk; |
1da177e4 | 853 | else |
86e6ffdd | 854 | desc_nr = next_spare++; |
19133a42 | 855 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
856 | d = &sb->disks[rdev2->desc_nr]; |
857 | nr_disks++; | |
858 | d->number = rdev2->desc_nr; | |
859 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
860 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
861 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
862 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
863 | d->raid_disk = rdev2->raid_disk; |
864 | else | |
865 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
b2d444d7 | 866 | if (test_bit(Faulty, &rdev2->flags)) { |
1da177e4 LT |
867 | d->state = (1<<MD_DISK_FAULTY); |
868 | failed++; | |
b2d444d7 | 869 | } else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
870 | d->state = (1<<MD_DISK_ACTIVE); |
871 | d->state |= (1<<MD_DISK_SYNC); | |
872 | active++; | |
873 | working++; | |
874 | } else { | |
875 | d->state = 0; | |
876 | spare++; | |
877 | working++; | |
878 | } | |
8ddf9efe N |
879 | if (test_bit(WriteMostly, &rdev2->flags)) |
880 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 881 | } |
1da177e4 LT |
882 | /* now set the "removed" and "faulty" bits on any missing devices */ |
883 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
884 | mdp_disk_t *d = &sb->disks[i]; | |
885 | if (d->state == 0 && d->number == 0) { | |
886 | d->number = i; | |
887 | d->raid_disk = i; | |
888 | d->state = (1<<MD_DISK_REMOVED); | |
889 | d->state |= (1<<MD_DISK_FAULTY); | |
890 | failed++; | |
891 | } | |
892 | } | |
893 | sb->nr_disks = nr_disks; | |
894 | sb->active_disks = active; | |
895 | sb->working_disks = working; | |
896 | sb->failed_disks = failed; | |
897 | sb->spare_disks = spare; | |
898 | ||
899 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
900 | sb->sb_csum = calc_sb_csum(sb); | |
901 | } | |
902 | ||
903 | /* | |
904 | * version 1 superblock | |
905 | */ | |
906 | ||
907 | static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) | |
908 | { | |
909 | unsigned int disk_csum, csum; | |
910 | unsigned long long newcsum; | |
911 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
912 | unsigned int *isuper = (unsigned int*)sb; | |
913 | int i; | |
914 | ||
915 | disk_csum = sb->sb_csum; | |
916 | sb->sb_csum = 0; | |
917 | newcsum = 0; | |
918 | for (i=0; size>=4; size -= 4 ) | |
919 | newcsum += le32_to_cpu(*isuper++); | |
920 | ||
921 | if (size == 2) | |
922 | newcsum += le16_to_cpu(*(unsigned short*) isuper); | |
923 | ||
924 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
925 | sb->sb_csum = disk_csum; | |
926 | return cpu_to_le32(csum); | |
927 | } | |
928 | ||
929 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
930 | { | |
931 | struct mdp_superblock_1 *sb; | |
932 | int ret; | |
933 | sector_t sb_offset; | |
934 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 935 | int bmask; |
1da177e4 LT |
936 | |
937 | /* | |
938 | * Calculate the position of the superblock. | |
939 | * It is always aligned to a 4K boundary and | |
940 | * depeding on minor_version, it can be: | |
941 | * 0: At least 8K, but less than 12K, from end of device | |
942 | * 1: At start of device | |
943 | * 2: 4K from start of device. | |
944 | */ | |
945 | switch(minor_version) { | |
946 | case 0: | |
947 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
948 | sb_offset -= 8*2; | |
39730960 | 949 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
950 | /* convert from sectors to K */ |
951 | sb_offset /= 2; | |
952 | break; | |
953 | case 1: | |
954 | sb_offset = 0; | |
955 | break; | |
956 | case 2: | |
957 | sb_offset = 4; | |
958 | break; | |
959 | default: | |
960 | return -EINVAL; | |
961 | } | |
962 | rdev->sb_offset = sb_offset; | |
963 | ||
0002b271 N |
964 | /* superblock is rarely larger than 1K, but it can be larger, |
965 | * and it is safe to read 4k, so we do that | |
966 | */ | |
967 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
968 | if (ret) return ret; |
969 | ||
970 | ||
971 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
972 | ||
973 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
974 | sb->major_version != cpu_to_le32(1) || | |
975 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
976 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 977 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
978 | return -EINVAL; |
979 | ||
980 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
981 | printk("md: invalid superblock checksum on %s\n", | |
982 | bdevname(rdev->bdev,b)); | |
983 | return -EINVAL; | |
984 | } | |
985 | if (le64_to_cpu(sb->data_size) < 10) { | |
986 | printk("md: data_size too small on %s\n", | |
987 | bdevname(rdev->bdev,b)); | |
988 | return -EINVAL; | |
989 | } | |
990 | rdev->preferred_minor = 0xffff; | |
991 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
992 | ||
0002b271 | 993 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 994 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 N |
995 | if (rdev->sb_size & bmask) |
996 | rdev-> sb_size = (rdev->sb_size | bmask)+1; | |
997 | ||
1da177e4 LT |
998 | if (refdev == 0) |
999 | return 1; | |
1000 | else { | |
1001 | __u64 ev1, ev2; | |
1002 | struct mdp_superblock_1 *refsb = | |
1003 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1004 | ||
1005 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1006 | sb->level != refsb->level || | |
1007 | sb->layout != refsb->layout || | |
1008 | sb->chunksize != refsb->chunksize) { | |
1009 | printk(KERN_WARNING "md: %s has strangely different" | |
1010 | " superblock to %s\n", | |
1011 | bdevname(rdev->bdev,b), | |
1012 | bdevname(refdev->bdev,b2)); | |
1013 | return -EINVAL; | |
1014 | } | |
1015 | ev1 = le64_to_cpu(sb->events); | |
1016 | ev2 = le64_to_cpu(refsb->events); | |
1017 | ||
1018 | if (ev1 > ev2) | |
1019 | return 1; | |
1020 | } | |
1021 | if (minor_version) | |
1022 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; | |
1023 | else | |
1024 | rdev->size = rdev->sb_offset; | |
1025 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
1026 | return -EINVAL; | |
1027 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1028 | if (le32_to_cpu(sb->chunksize)) | |
1029 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
1030 | return 0; | |
1031 | } | |
1032 | ||
1033 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1034 | { | |
1035 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1036 | ||
41158c7e | 1037 | rdev->raid_disk = -1; |
b2d444d7 | 1038 | rdev->flags = 0; |
1da177e4 LT |
1039 | if (mddev->raid_disks == 0) { |
1040 | mddev->major_version = 1; | |
1041 | mddev->patch_version = 0; | |
1042 | mddev->persistent = 1; | |
1043 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; | |
1044 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1045 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1046 | mddev->level = le32_to_cpu(sb->level); | |
1047 | mddev->layout = le32_to_cpu(sb->layout); | |
1048 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1049 | mddev->size = le64_to_cpu(sb->size)/2; | |
1050 | mddev->events = le64_to_cpu(sb->events); | |
9223214e | 1051 | mddev->bitmap_offset = 0; |
53e87fbb | 1052 | mddev->default_bitmap_offset = 1024; |
1da177e4 LT |
1053 | |
1054 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1055 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1056 | ||
1057 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1058 | |
71c0805c | 1059 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
a654b9d8 | 1060 | mddev->bitmap_file == NULL ) { |
6cce3b23 N |
1061 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 |
1062 | && mddev->level != 10) { | |
1063 | printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); | |
a654b9d8 N |
1064 | return -EINVAL; |
1065 | } | |
1066 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); | |
1067 | } | |
41158c7e N |
1068 | } else if (mddev->pers == NULL) { |
1069 | /* Insist of good event counter while assembling */ | |
1070 | __u64 ev1 = le64_to_cpu(sb->events); | |
1da177e4 LT |
1071 | ++ev1; |
1072 | if (ev1 < mddev->events) | |
1073 | return -EINVAL; | |
41158c7e N |
1074 | } else if (mddev->bitmap) { |
1075 | /* If adding to array with a bitmap, then we can accept an | |
1076 | * older device, but not too old. | |
1077 | */ | |
1078 | __u64 ev1 = le64_to_cpu(sb->events); | |
1079 | if (ev1 < mddev->bitmap->events_cleared) | |
1080 | return 0; | |
1081 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1082 | return 0; | |
1da177e4 LT |
1083 | |
1084 | if (mddev->level != LEVEL_MULTIPATH) { | |
1085 | int role; | |
1086 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1087 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1088 | switch(role) { | |
1089 | case 0xffff: /* spare */ | |
1da177e4 LT |
1090 | break; |
1091 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1092 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1093 | break; |
1094 | default: | |
b2d444d7 | 1095 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1096 | rdev->raid_disk = role; |
1097 | break; | |
1098 | } | |
8ddf9efe N |
1099 | if (sb->devflags & WriteMostly1) |
1100 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1101 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1102 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1103 | |
1da177e4 LT |
1104 | return 0; |
1105 | } | |
1106 | ||
1107 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1108 | { | |
1109 | struct mdp_superblock_1 *sb; | |
1110 | struct list_head *tmp; | |
1111 | mdk_rdev_t *rdev2; | |
1112 | int max_dev, i; | |
1113 | /* make rdev->sb match mddev and rdev data. */ | |
1114 | ||
1115 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1116 | ||
1117 | sb->feature_map = 0; | |
1118 | sb->pad0 = 0; | |
1119 | memset(sb->pad1, 0, sizeof(sb->pad1)); | |
1120 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1121 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1122 | ||
1123 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1124 | sb->events = cpu_to_le64(mddev->events); | |
1125 | if (mddev->in_sync) | |
1126 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1127 | else | |
1128 | sb->resync_offset = cpu_to_le64(0); | |
1129 | ||
a654b9d8 N |
1130 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1131 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1132 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 N |
1133 | } |
1134 | ||
1da177e4 LT |
1135 | max_dev = 0; |
1136 | ITERATE_RDEV(mddev,rdev2,tmp) | |
1137 | if (rdev2->desc_nr+1 > max_dev) | |
1138 | max_dev = rdev2->desc_nr+1; | |
1139 | ||
1140 | sb->max_dev = cpu_to_le32(max_dev); | |
1141 | for (i=0; i<max_dev;i++) | |
1142 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1143 | ||
1144 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
1145 | i = rdev2->desc_nr; | |
b2d444d7 | 1146 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1147 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1148 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 LT |
1149 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1150 | else | |
1151 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1152 | } | |
1153 | ||
1154 | sb->recovery_offset = cpu_to_le64(0); /* not supported yet */ | |
1155 | sb->sb_csum = calc_sb_1_csum(sb); | |
1156 | } | |
1157 | ||
1158 | ||
75c96f85 | 1159 | static struct super_type super_types[] = { |
1da177e4 LT |
1160 | [0] = { |
1161 | .name = "0.90.0", | |
1162 | .owner = THIS_MODULE, | |
1163 | .load_super = super_90_load, | |
1164 | .validate_super = super_90_validate, | |
1165 | .sync_super = super_90_sync, | |
1166 | }, | |
1167 | [1] = { | |
1168 | .name = "md-1", | |
1169 | .owner = THIS_MODULE, | |
1170 | .load_super = super_1_load, | |
1171 | .validate_super = super_1_validate, | |
1172 | .sync_super = super_1_sync, | |
1173 | }, | |
1174 | }; | |
1175 | ||
1176 | static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) | |
1177 | { | |
1178 | struct list_head *tmp; | |
1179 | mdk_rdev_t *rdev; | |
1180 | ||
1181 | ITERATE_RDEV(mddev,rdev,tmp) | |
1182 | if (rdev->bdev->bd_contains == dev->bdev->bd_contains) | |
1183 | return rdev; | |
1184 | ||
1185 | return NULL; | |
1186 | } | |
1187 | ||
1188 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1189 | { | |
1190 | struct list_head *tmp; | |
1191 | mdk_rdev_t *rdev; | |
1192 | ||
1193 | ITERATE_RDEV(mddev1,rdev,tmp) | |
1194 | if (match_dev_unit(mddev2, rdev)) | |
1195 | return 1; | |
1196 | ||
1197 | return 0; | |
1198 | } | |
1199 | ||
1200 | static LIST_HEAD(pending_raid_disks); | |
1201 | ||
1202 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1203 | { | |
1204 | mdk_rdev_t *same_pdev; | |
1205 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
f637b9f9 | 1206 | struct kobject *ko; |
1da177e4 LT |
1207 | |
1208 | if (rdev->mddev) { | |
1209 | MD_BUG(); | |
1210 | return -EINVAL; | |
1211 | } | |
1212 | same_pdev = match_dev_unit(mddev, rdev); | |
1213 | if (same_pdev) | |
1214 | printk(KERN_WARNING | |
1215 | "%s: WARNING: %s appears to be on the same physical" | |
1216 | " disk as %s. True\n protection against single-disk" | |
1217 | " failure might be compromised.\n", | |
1218 | mdname(mddev), bdevname(rdev->bdev,b), | |
1219 | bdevname(same_pdev->bdev,b2)); | |
1220 | ||
1221 | /* Verify rdev->desc_nr is unique. | |
1222 | * If it is -1, assign a free number, else | |
1223 | * check number is not in use | |
1224 | */ | |
1225 | if (rdev->desc_nr < 0) { | |
1226 | int choice = 0; | |
1227 | if (mddev->pers) choice = mddev->raid_disks; | |
1228 | while (find_rdev_nr(mddev, choice)) | |
1229 | choice++; | |
1230 | rdev->desc_nr = choice; | |
1231 | } else { | |
1232 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1233 | return -EBUSY; | |
1234 | } | |
19133a42 N |
1235 | bdevname(rdev->bdev,b); |
1236 | if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) | |
1237 | return -ENOMEM; | |
1da177e4 LT |
1238 | |
1239 | list_add(&rdev->same_set, &mddev->disks); | |
1240 | rdev->mddev = mddev; | |
19133a42 | 1241 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1242 | |
9c791977 | 1243 | rdev->kobj.parent = &mddev->kobj; |
86e6ffdd N |
1244 | kobject_add(&rdev->kobj); |
1245 | ||
f637b9f9 N |
1246 | if (rdev->bdev->bd_part) |
1247 | ko = &rdev->bdev->bd_part->kobj; | |
1248 | else | |
1249 | ko = &rdev->bdev->bd_disk->kobj; | |
1250 | sysfs_create_link(&rdev->kobj, ko, "block"); | |
1da177e4 LT |
1251 | return 0; |
1252 | } | |
1253 | ||
1254 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) | |
1255 | { | |
1256 | char b[BDEVNAME_SIZE]; | |
1257 | if (!rdev->mddev) { | |
1258 | MD_BUG(); | |
1259 | return; | |
1260 | } | |
1261 | list_del_init(&rdev->same_set); | |
1262 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1263 | rdev->mddev = NULL; | |
86e6ffdd N |
1264 | sysfs_remove_link(&rdev->kobj, "block"); |
1265 | kobject_del(&rdev->kobj); | |
1da177e4 LT |
1266 | } |
1267 | ||
1268 | /* | |
1269 | * prevent the device from being mounted, repartitioned or | |
1270 | * otherwise reused by a RAID array (or any other kernel | |
1271 | * subsystem), by bd_claiming the device. | |
1272 | */ | |
1273 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) | |
1274 | { | |
1275 | int err = 0; | |
1276 | struct block_device *bdev; | |
1277 | char b[BDEVNAME_SIZE]; | |
1278 | ||
1279 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
1280 | if (IS_ERR(bdev)) { | |
1281 | printk(KERN_ERR "md: could not open %s.\n", | |
1282 | __bdevname(dev, b)); | |
1283 | return PTR_ERR(bdev); | |
1284 | } | |
1285 | err = bd_claim(bdev, rdev); | |
1286 | if (err) { | |
1287 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1288 | bdevname(bdev, b)); | |
1289 | blkdev_put(bdev); | |
1290 | return err; | |
1291 | } | |
1292 | rdev->bdev = bdev; | |
1293 | return err; | |
1294 | } | |
1295 | ||
1296 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1297 | { | |
1298 | struct block_device *bdev = rdev->bdev; | |
1299 | rdev->bdev = NULL; | |
1300 | if (!bdev) | |
1301 | MD_BUG(); | |
1302 | bd_release(bdev); | |
1303 | blkdev_put(bdev); | |
1304 | } | |
1305 | ||
1306 | void md_autodetect_dev(dev_t dev); | |
1307 | ||
1308 | static void export_rdev(mdk_rdev_t * rdev) | |
1309 | { | |
1310 | char b[BDEVNAME_SIZE]; | |
1311 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1312 | bdevname(rdev->bdev,b)); | |
1313 | if (rdev->mddev) | |
1314 | MD_BUG(); | |
1315 | free_disk_sb(rdev); | |
1316 | list_del_init(&rdev->same_set); | |
1317 | #ifndef MODULE | |
1318 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1319 | #endif | |
1320 | unlock_rdev(rdev); | |
86e6ffdd | 1321 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1322 | } |
1323 | ||
1324 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1325 | { | |
1326 | unbind_rdev_from_array(rdev); | |
1327 | export_rdev(rdev); | |
1328 | } | |
1329 | ||
1330 | static void export_array(mddev_t *mddev) | |
1331 | { | |
1332 | struct list_head *tmp; | |
1333 | mdk_rdev_t *rdev; | |
1334 | ||
1335 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1336 | if (!rdev->mddev) { | |
1337 | MD_BUG(); | |
1338 | continue; | |
1339 | } | |
1340 | kick_rdev_from_array(rdev); | |
1341 | } | |
1342 | if (!list_empty(&mddev->disks)) | |
1343 | MD_BUG(); | |
1344 | mddev->raid_disks = 0; | |
1345 | mddev->major_version = 0; | |
1346 | } | |
1347 | ||
1348 | static void print_desc(mdp_disk_t *desc) | |
1349 | { | |
1350 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1351 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1352 | } | |
1353 | ||
1354 | static void print_sb(mdp_super_t *sb) | |
1355 | { | |
1356 | int i; | |
1357 | ||
1358 | printk(KERN_INFO | |
1359 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1360 | sb->major_version, sb->minor_version, sb->patch_version, | |
1361 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1362 | sb->ctime); | |
1363 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1364 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1365 | sb->md_minor, sb->layout, sb->chunk_size); | |
1366 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1367 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1368 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1369 | sb->failed_disks, sb->spare_disks, | |
1370 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1371 | ||
1372 | printk(KERN_INFO); | |
1373 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1374 | mdp_disk_t *desc; | |
1375 | ||
1376 | desc = sb->disks + i; | |
1377 | if (desc->number || desc->major || desc->minor || | |
1378 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1379 | printk(" D %2d: ", i); | |
1380 | print_desc(desc); | |
1381 | } | |
1382 | } | |
1383 | printk(KERN_INFO "md: THIS: "); | |
1384 | print_desc(&sb->this_disk); | |
1385 | ||
1386 | } | |
1387 | ||
1388 | static void print_rdev(mdk_rdev_t *rdev) | |
1389 | { | |
1390 | char b[BDEVNAME_SIZE]; | |
1391 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1392 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1393 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1394 | rdev->desc_nr); | |
1da177e4 LT |
1395 | if (rdev->sb_loaded) { |
1396 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1397 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1398 | } else | |
1399 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1400 | } | |
1401 | ||
1402 | void md_print_devices(void) | |
1403 | { | |
1404 | struct list_head *tmp, *tmp2; | |
1405 | mdk_rdev_t *rdev; | |
1406 | mddev_t *mddev; | |
1407 | char b[BDEVNAME_SIZE]; | |
1408 | ||
1409 | printk("\n"); | |
1410 | printk("md: **********************************\n"); | |
1411 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1412 | printk("md: **********************************\n"); | |
1413 | ITERATE_MDDEV(mddev,tmp) { | |
1da177e4 | 1414 | |
32a7627c N |
1415 | if (mddev->bitmap) |
1416 | bitmap_print_sb(mddev->bitmap); | |
1417 | else | |
1418 | printk("%s: ", mdname(mddev)); | |
1da177e4 LT |
1419 | ITERATE_RDEV(mddev,rdev,tmp2) |
1420 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1421 | printk("\n"); | |
1422 | ||
1423 | ITERATE_RDEV(mddev,rdev,tmp2) | |
1424 | print_rdev(rdev); | |
1425 | } | |
1426 | printk("md: **********************************\n"); | |
1427 | printk("\n"); | |
1428 | } | |
1429 | ||
1430 | ||
1da177e4 LT |
1431 | static void sync_sbs(mddev_t * mddev) |
1432 | { | |
1433 | mdk_rdev_t *rdev; | |
1434 | struct list_head *tmp; | |
1435 | ||
1436 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1437 | super_types[mddev->major_version]. | |
1438 | sync_super(mddev, rdev); | |
1439 | rdev->sb_loaded = 1; | |
1440 | } | |
1441 | } | |
1442 | ||
1443 | static void md_update_sb(mddev_t * mddev) | |
1444 | { | |
7bfa19f2 | 1445 | int err; |
1da177e4 LT |
1446 | struct list_head *tmp; |
1447 | mdk_rdev_t *rdev; | |
06d91a5f | 1448 | int sync_req; |
1da177e4 | 1449 | |
1da177e4 | 1450 | repeat: |
a9701a30 | 1451 | spin_lock_irq(&mddev->write_lock); |
06d91a5f | 1452 | sync_req = mddev->in_sync; |
1da177e4 LT |
1453 | mddev->utime = get_seconds(); |
1454 | mddev->events ++; | |
1455 | ||
1456 | if (!mddev->events) { | |
1457 | /* | |
1458 | * oops, this 64-bit counter should never wrap. | |
1459 | * Either we are in around ~1 trillion A.C., assuming | |
1460 | * 1 reboot per second, or we have a bug: | |
1461 | */ | |
1462 | MD_BUG(); | |
1463 | mddev->events --; | |
1464 | } | |
7bfa19f2 | 1465 | mddev->sb_dirty = 2; |
1da177e4 LT |
1466 | sync_sbs(mddev); |
1467 | ||
1468 | /* | |
1469 | * do not write anything to disk if using | |
1470 | * nonpersistent superblocks | |
1471 | */ | |
06d91a5f N |
1472 | if (!mddev->persistent) { |
1473 | mddev->sb_dirty = 0; | |
a9701a30 | 1474 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1475 | wake_up(&mddev->sb_wait); |
1da177e4 | 1476 | return; |
06d91a5f | 1477 | } |
a9701a30 | 1478 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1479 | |
1480 | dprintk(KERN_INFO | |
1481 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1482 | mdname(mddev),mddev->in_sync); | |
1483 | ||
32a7627c | 1484 | err = bitmap_update_sb(mddev->bitmap); |
1da177e4 LT |
1485 | ITERATE_RDEV(mddev,rdev,tmp) { |
1486 | char b[BDEVNAME_SIZE]; | |
1487 | dprintk(KERN_INFO "md: "); | |
b2d444d7 | 1488 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1489 | dprintk("(skipping faulty "); |
1490 | ||
1491 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1492 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1493 | md_super_write(mddev,rdev, |
0002b271 | 1494 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1495 | rdev->sb_page); |
1496 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1497 | bdevname(rdev->bdev,b), | |
1498 | (unsigned long long)rdev->sb_offset); | |
1499 | ||
1da177e4 LT |
1500 | } else |
1501 | dprintk(")\n"); | |
7bfa19f2 | 1502 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1503 | /* only need to write one superblock... */ |
1504 | break; | |
1505 | } | |
a9701a30 | 1506 | md_super_wait(mddev); |
7bfa19f2 N |
1507 | /* if there was a failure, sb_dirty was set to 1, and we re-write super */ |
1508 | ||
a9701a30 | 1509 | spin_lock_irq(&mddev->write_lock); |
7bfa19f2 | 1510 | if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { |
06d91a5f | 1511 | /* have to write it out again */ |
a9701a30 | 1512 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1513 | goto repeat; |
1514 | } | |
1515 | mddev->sb_dirty = 0; | |
a9701a30 | 1516 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1517 | wake_up(&mddev->sb_wait); |
06d91a5f | 1518 | |
1da177e4 LT |
1519 | } |
1520 | ||
86e6ffdd N |
1521 | struct rdev_sysfs_entry { |
1522 | struct attribute attr; | |
1523 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1524 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1525 | }; | |
1526 | ||
1527 | static ssize_t | |
96de1e66 | 1528 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1529 | { |
1530 | char *sep = ""; | |
1531 | int len=0; | |
1532 | ||
b2d444d7 | 1533 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1534 | len+= sprintf(page+len, "%sfaulty",sep); |
1535 | sep = ","; | |
1536 | } | |
b2d444d7 | 1537 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1538 | len += sprintf(page+len, "%sin_sync",sep); |
1539 | sep = ","; | |
1540 | } | |
b2d444d7 N |
1541 | if (!test_bit(Faulty, &rdev->flags) && |
1542 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1543 | len += sprintf(page+len, "%sspare", sep); |
1544 | sep = ","; | |
1545 | } | |
1546 | return len+sprintf(page+len, "\n"); | |
1547 | } | |
1548 | ||
96de1e66 N |
1549 | static struct rdev_sysfs_entry |
1550 | rdev_state = __ATTR_RO(state); | |
86e6ffdd N |
1551 | |
1552 | static ssize_t | |
96de1e66 | 1553 | super_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1554 | { |
1555 | if (rdev->sb_loaded && rdev->sb_size) { | |
1556 | memcpy(page, page_address(rdev->sb_page), rdev->sb_size); | |
1557 | return rdev->sb_size; | |
1558 | } else | |
1559 | return 0; | |
1560 | } | |
96de1e66 N |
1561 | static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); |
1562 | ||
86e6ffdd N |
1563 | static struct attribute *rdev_default_attrs[] = { |
1564 | &rdev_state.attr, | |
1565 | &rdev_super.attr, | |
1566 | NULL, | |
1567 | }; | |
1568 | static ssize_t | |
1569 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1570 | { | |
1571 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1572 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1573 | ||
1574 | if (!entry->show) | |
1575 | return -EIO; | |
1576 | return entry->show(rdev, page); | |
1577 | } | |
1578 | ||
1579 | static ssize_t | |
1580 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
1581 | const char *page, size_t length) | |
1582 | { | |
1583 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1584 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1585 | ||
1586 | if (!entry->store) | |
1587 | return -EIO; | |
1588 | return entry->store(rdev, page, length); | |
1589 | } | |
1590 | ||
1591 | static void rdev_free(struct kobject *ko) | |
1592 | { | |
1593 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
1594 | kfree(rdev); | |
1595 | } | |
1596 | static struct sysfs_ops rdev_sysfs_ops = { | |
1597 | .show = rdev_attr_show, | |
1598 | .store = rdev_attr_store, | |
1599 | }; | |
1600 | static struct kobj_type rdev_ktype = { | |
1601 | .release = rdev_free, | |
1602 | .sysfs_ops = &rdev_sysfs_ops, | |
1603 | .default_attrs = rdev_default_attrs, | |
1604 | }; | |
1605 | ||
1da177e4 LT |
1606 | /* |
1607 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
1608 | * | |
1609 | * mark the device faulty if: | |
1610 | * | |
1611 | * - the device is nonexistent (zero size) | |
1612 | * - the device has no valid superblock | |
1613 | * | |
1614 | * a faulty rdev _never_ has rdev->sb set. | |
1615 | */ | |
1616 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
1617 | { | |
1618 | char b[BDEVNAME_SIZE]; | |
1619 | int err; | |
1620 | mdk_rdev_t *rdev; | |
1621 | sector_t size; | |
1622 | ||
1623 | rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL); | |
1624 | if (!rdev) { | |
1625 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
1626 | return ERR_PTR(-ENOMEM); | |
1627 | } | |
1628 | memset(rdev, 0, sizeof(*rdev)); | |
1629 | ||
1630 | if ((err = alloc_disk_sb(rdev))) | |
1631 | goto abort_free; | |
1632 | ||
1633 | err = lock_rdev(rdev, newdev); | |
1634 | if (err) | |
1635 | goto abort_free; | |
1636 | ||
86e6ffdd N |
1637 | rdev->kobj.parent = NULL; |
1638 | rdev->kobj.ktype = &rdev_ktype; | |
1639 | kobject_init(&rdev->kobj); | |
1640 | ||
1da177e4 | 1641 | rdev->desc_nr = -1; |
b2d444d7 | 1642 | rdev->flags = 0; |
1da177e4 LT |
1643 | rdev->data_offset = 0; |
1644 | atomic_set(&rdev->nr_pending, 0); | |
ba22dcbf | 1645 | atomic_set(&rdev->read_errors, 0); |
1da177e4 LT |
1646 | |
1647 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
1648 | if (!size) { | |
1649 | printk(KERN_WARNING | |
1650 | "md: %s has zero or unknown size, marking faulty!\n", | |
1651 | bdevname(rdev->bdev,b)); | |
1652 | err = -EINVAL; | |
1653 | goto abort_free; | |
1654 | } | |
1655 | ||
1656 | if (super_format >= 0) { | |
1657 | err = super_types[super_format]. | |
1658 | load_super(rdev, NULL, super_minor); | |
1659 | if (err == -EINVAL) { | |
1660 | printk(KERN_WARNING | |
1661 | "md: %s has invalid sb, not importing!\n", | |
1662 | bdevname(rdev->bdev,b)); | |
1663 | goto abort_free; | |
1664 | } | |
1665 | if (err < 0) { | |
1666 | printk(KERN_WARNING | |
1667 | "md: could not read %s's sb, not importing!\n", | |
1668 | bdevname(rdev->bdev,b)); | |
1669 | goto abort_free; | |
1670 | } | |
1671 | } | |
1672 | INIT_LIST_HEAD(&rdev->same_set); | |
1673 | ||
1674 | return rdev; | |
1675 | ||
1676 | abort_free: | |
1677 | if (rdev->sb_page) { | |
1678 | if (rdev->bdev) | |
1679 | unlock_rdev(rdev); | |
1680 | free_disk_sb(rdev); | |
1681 | } | |
1682 | kfree(rdev); | |
1683 | return ERR_PTR(err); | |
1684 | } | |
1685 | ||
1686 | /* | |
1687 | * Check a full RAID array for plausibility | |
1688 | */ | |
1689 | ||
1690 | ||
a757e64c | 1691 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
1692 | { |
1693 | int i; | |
1694 | struct list_head *tmp; | |
1695 | mdk_rdev_t *rdev, *freshest; | |
1696 | char b[BDEVNAME_SIZE]; | |
1697 | ||
1698 | freshest = NULL; | |
1699 | ITERATE_RDEV(mddev,rdev,tmp) | |
1700 | switch (super_types[mddev->major_version]. | |
1701 | load_super(rdev, freshest, mddev->minor_version)) { | |
1702 | case 1: | |
1703 | freshest = rdev; | |
1704 | break; | |
1705 | case 0: | |
1706 | break; | |
1707 | default: | |
1708 | printk( KERN_ERR \ | |
1709 | "md: fatal superblock inconsistency in %s" | |
1710 | " -- removing from array\n", | |
1711 | bdevname(rdev->bdev,b)); | |
1712 | kick_rdev_from_array(rdev); | |
1713 | } | |
1714 | ||
1715 | ||
1716 | super_types[mddev->major_version]. | |
1717 | validate_super(mddev, freshest); | |
1718 | ||
1719 | i = 0; | |
1720 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1721 | if (rdev != freshest) | |
1722 | if (super_types[mddev->major_version]. | |
1723 | validate_super(mddev, rdev)) { | |
1724 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
1725 | " from array!\n", | |
1726 | bdevname(rdev->bdev,b)); | |
1727 | kick_rdev_from_array(rdev); | |
1728 | continue; | |
1729 | } | |
1730 | if (mddev->level == LEVEL_MULTIPATH) { | |
1731 | rdev->desc_nr = i++; | |
1732 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 1733 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1734 | } |
1735 | } | |
1736 | ||
1737 | ||
1738 | ||
1739 | if (mddev->recovery_cp != MaxSector && | |
1740 | mddev->level >= 1) | |
1741 | printk(KERN_ERR "md: %s: raid array is not clean" | |
1742 | " -- starting background reconstruction\n", | |
1743 | mdname(mddev)); | |
1744 | ||
1da177e4 LT |
1745 | } |
1746 | ||
eae1701f | 1747 | static ssize_t |
96de1e66 | 1748 | level_show(mddev_t *mddev, char *page) |
eae1701f N |
1749 | { |
1750 | mdk_personality_t *p = mddev->pers; | |
bb636547 | 1751 | if (p == NULL && mddev->raid_disks == 0) |
eae1701f N |
1752 | return 0; |
1753 | if (mddev->level >= 0) | |
bcb97940 | 1754 | return sprintf(page, "raid%d\n", mddev->level); |
eae1701f N |
1755 | else |
1756 | return sprintf(page, "%s\n", p->name); | |
1757 | } | |
1758 | ||
96de1e66 | 1759 | static struct md_sysfs_entry md_level = __ATTR_RO(level); |
eae1701f N |
1760 | |
1761 | static ssize_t | |
96de1e66 | 1762 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 1763 | { |
bb636547 N |
1764 | if (mddev->raid_disks == 0) |
1765 | return 0; | |
eae1701f N |
1766 | return sprintf(page, "%d\n", mddev->raid_disks); |
1767 | } | |
1768 | ||
96de1e66 | 1769 | static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks); |
eae1701f | 1770 | |
24dd469d | 1771 | static ssize_t |
7eec314d | 1772 | action_show(mddev_t *mddev, char *page) |
24dd469d | 1773 | { |
7eec314d | 1774 | char *type = "idle"; |
31399d9e N |
1775 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
1776 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { | |
1777 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
1778 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
1779 | type = "resync"; | |
1780 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
1781 | type = "check"; | |
1782 | else | |
1783 | type = "repair"; | |
1784 | } else | |
1785 | type = "recover"; | |
1786 | } | |
1787 | return sprintf(page, "%s\n", type); | |
1788 | } | |
1789 | ||
1790 | static ssize_t | |
7eec314d | 1791 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 1792 | { |
7eec314d N |
1793 | if (!mddev->pers || !mddev->pers->sync_request) |
1794 | return -EINVAL; | |
1795 | ||
1796 | if (strcmp(page, "idle")==0 || strcmp(page, "idle\n")==0) { | |
1797 | if (mddev->sync_thread) { | |
1798 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1799 | md_unregister_thread(mddev->sync_thread); | |
1800 | mddev->sync_thread = NULL; | |
1801 | mddev->recovery = 0; | |
1802 | } | |
1803 | return len; | |
1804 | } | |
31399d9e N |
1805 | |
1806 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1807 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 1808 | return -EBUSY; |
7eec314d N |
1809 | if (strcmp(page, "resync")==0 || strcmp(page, "resync\n")==0 || |
1810 | strcmp(page, "recover")==0 || strcmp(page, "recover\n")==0) | |
1811 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1812 | else { | |
1813 | if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0) | |
1814 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
1815 | else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0) | |
1816 | return -EINVAL; | |
1817 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
1818 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
1819 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1820 | } | |
24dd469d N |
1821 | md_wakeup_thread(mddev->thread); |
1822 | return len; | |
1823 | } | |
1824 | ||
9d88883e | 1825 | static ssize_t |
96de1e66 | 1826 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
1827 | { |
1828 | return sprintf(page, "%llu\n", | |
1829 | (unsigned long long) mddev->resync_mismatches); | |
1830 | } | |
1831 | ||
96de1e66 | 1832 | static struct md_sysfs_entry |
7eec314d | 1833 | md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
24dd469d | 1834 | |
96de1e66 N |
1835 | |
1836 | static struct md_sysfs_entry | |
1837 | md_mismatches = __ATTR_RO(mismatch_cnt); | |
9d88883e | 1838 | |
eae1701f N |
1839 | static struct attribute *md_default_attrs[] = { |
1840 | &md_level.attr, | |
1841 | &md_raid_disks.attr, | |
411036fa N |
1842 | NULL, |
1843 | }; | |
1844 | ||
1845 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 1846 | &md_scan_mode.attr, |
9d88883e | 1847 | &md_mismatches.attr, |
eae1701f N |
1848 | NULL, |
1849 | }; | |
411036fa N |
1850 | static struct attribute_group md_redundancy_group = { |
1851 | .name = NULL, | |
1852 | .attrs = md_redundancy_attrs, | |
1853 | }; | |
1854 | ||
eae1701f N |
1855 | |
1856 | static ssize_t | |
1857 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1858 | { | |
1859 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
1860 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 1861 | ssize_t rv; |
eae1701f N |
1862 | |
1863 | if (!entry->show) | |
1864 | return -EIO; | |
96de1e66 N |
1865 | mddev_lock(mddev); |
1866 | rv = entry->show(mddev, page); | |
1867 | mddev_unlock(mddev); | |
1868 | return rv; | |
eae1701f N |
1869 | } |
1870 | ||
1871 | static ssize_t | |
1872 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
1873 | const char *page, size_t length) | |
1874 | { | |
1875 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
1876 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 1877 | ssize_t rv; |
eae1701f N |
1878 | |
1879 | if (!entry->store) | |
1880 | return -EIO; | |
96de1e66 N |
1881 | mddev_lock(mddev); |
1882 | rv = entry->store(mddev, page, length); | |
1883 | mddev_unlock(mddev); | |
1884 | return rv; | |
eae1701f N |
1885 | } |
1886 | ||
1887 | static void md_free(struct kobject *ko) | |
1888 | { | |
1889 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
1890 | kfree(mddev); | |
1891 | } | |
1892 | ||
1893 | static struct sysfs_ops md_sysfs_ops = { | |
1894 | .show = md_attr_show, | |
1895 | .store = md_attr_store, | |
1896 | }; | |
1897 | static struct kobj_type md_ktype = { | |
1898 | .release = md_free, | |
1899 | .sysfs_ops = &md_sysfs_ops, | |
1900 | .default_attrs = md_default_attrs, | |
1901 | }; | |
1902 | ||
1da177e4 LT |
1903 | int mdp_major = 0; |
1904 | ||
1905 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
1906 | { | |
1907 | static DECLARE_MUTEX(disks_sem); | |
1908 | mddev_t *mddev = mddev_find(dev); | |
1909 | struct gendisk *disk; | |
1910 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
1911 | int shift = partitioned ? MdpMinorShift : 0; | |
1912 | int unit = MINOR(dev) >> shift; | |
1913 | ||
1914 | if (!mddev) | |
1915 | return NULL; | |
1916 | ||
1917 | down(&disks_sem); | |
1918 | if (mddev->gendisk) { | |
1919 | up(&disks_sem); | |
1920 | mddev_put(mddev); | |
1921 | return NULL; | |
1922 | } | |
1923 | disk = alloc_disk(1 << shift); | |
1924 | if (!disk) { | |
1925 | up(&disks_sem); | |
1926 | mddev_put(mddev); | |
1927 | return NULL; | |
1928 | } | |
1929 | disk->major = MAJOR(dev); | |
1930 | disk->first_minor = unit << shift; | |
1931 | if (partitioned) { | |
1932 | sprintf(disk->disk_name, "md_d%d", unit); | |
1933 | sprintf(disk->devfs_name, "md/d%d", unit); | |
1934 | } else { | |
1935 | sprintf(disk->disk_name, "md%d", unit); | |
1936 | sprintf(disk->devfs_name, "md/%d", unit); | |
1937 | } | |
1938 | disk->fops = &md_fops; | |
1939 | disk->private_data = mddev; | |
1940 | disk->queue = mddev->queue; | |
1941 | add_disk(disk); | |
1942 | mddev->gendisk = disk; | |
1943 | up(&disks_sem); | |
9c791977 | 1944 | mddev->kobj.parent = &disk->kobj; |
eae1701f N |
1945 | mddev->kobj.k_name = NULL; |
1946 | snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); | |
1947 | mddev->kobj.ktype = &md_ktype; | |
1948 | kobject_register(&mddev->kobj); | |
1da177e4 LT |
1949 | return NULL; |
1950 | } | |
1951 | ||
1952 | void md_wakeup_thread(mdk_thread_t *thread); | |
1953 | ||
1954 | static void md_safemode_timeout(unsigned long data) | |
1955 | { | |
1956 | mddev_t *mddev = (mddev_t *) data; | |
1957 | ||
1958 | mddev->safemode = 1; | |
1959 | md_wakeup_thread(mddev->thread); | |
1960 | } | |
1961 | ||
6ff8d8ec | 1962 | static int start_dirty_degraded; |
1da177e4 LT |
1963 | |
1964 | static int do_md_run(mddev_t * mddev) | |
1965 | { | |
1966 | int pnum, err; | |
1967 | int chunk_size; | |
1968 | struct list_head *tmp; | |
1969 | mdk_rdev_t *rdev; | |
1970 | struct gendisk *disk; | |
1971 | char b[BDEVNAME_SIZE]; | |
1972 | ||
a757e64c N |
1973 | if (list_empty(&mddev->disks)) |
1974 | /* cannot run an array with no devices.. */ | |
1da177e4 | 1975 | return -EINVAL; |
1da177e4 LT |
1976 | |
1977 | if (mddev->pers) | |
1978 | return -EBUSY; | |
1979 | ||
1980 | /* | |
1981 | * Analyze all RAID superblock(s) | |
1982 | */ | |
a757e64c N |
1983 | if (!mddev->raid_disks) |
1984 | analyze_sbs(mddev); | |
1da177e4 LT |
1985 | |
1986 | chunk_size = mddev->chunk_size; | |
1987 | pnum = level_to_pers(mddev->level); | |
1988 | ||
1989 | if ((pnum != MULTIPATH) && (pnum != RAID1)) { | |
1990 | if (!chunk_size) { | |
1991 | /* | |
1992 | * 'default chunksize' in the old md code used to | |
1993 | * be PAGE_SIZE, baaad. | |
1994 | * we abort here to be on the safe side. We don't | |
1995 | * want to continue the bad practice. | |
1996 | */ | |
1997 | printk(KERN_ERR | |
1998 | "no chunksize specified, see 'man raidtab'\n"); | |
1999 | return -EINVAL; | |
2000 | } | |
2001 | if (chunk_size > MAX_CHUNK_SIZE) { | |
2002 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
2003 | chunk_size, MAX_CHUNK_SIZE); | |
2004 | return -EINVAL; | |
2005 | } | |
2006 | /* | |
2007 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
2008 | */ | |
2009 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 2010 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
2011 | return -EINVAL; |
2012 | } | |
2013 | if (chunk_size < PAGE_SIZE) { | |
2014 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
2015 | chunk_size, PAGE_SIZE); | |
2016 | return -EINVAL; | |
2017 | } | |
2018 | ||
2019 | /* devices must have minimum size of one chunk */ | |
2020 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2021 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2022 | continue; |
2023 | if (rdev->size < chunk_size / 1024) { | |
2024 | printk(KERN_WARNING | |
2025 | "md: Dev %s smaller than chunk_size:" | |
2026 | " %lluk < %dk\n", | |
2027 | bdevname(rdev->bdev,b), | |
2028 | (unsigned long long)rdev->size, | |
2029 | chunk_size / 1024); | |
2030 | return -EINVAL; | |
2031 | } | |
2032 | } | |
2033 | } | |
2034 | ||
1da177e4 LT |
2035 | #ifdef CONFIG_KMOD |
2036 | if (!pers[pnum]) | |
2037 | { | |
2038 | request_module("md-personality-%d", pnum); | |
2039 | } | |
2040 | #endif | |
2041 | ||
2042 | /* | |
2043 | * Drop all container device buffers, from now on | |
2044 | * the only valid external interface is through the md | |
2045 | * device. | |
2046 | * Also find largest hardsector size | |
2047 | */ | |
2048 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2049 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2050 | continue; |
2051 | sync_blockdev(rdev->bdev); | |
2052 | invalidate_bdev(rdev->bdev, 0); | |
2053 | } | |
2054 | ||
2055 | md_probe(mddev->unit, NULL, NULL); | |
2056 | disk = mddev->gendisk; | |
2057 | if (!disk) | |
2058 | return -ENOMEM; | |
2059 | ||
2060 | spin_lock(&pers_lock); | |
2061 | if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) { | |
2062 | spin_unlock(&pers_lock); | |
2063 | printk(KERN_WARNING "md: personality %d is not loaded!\n", | |
2064 | pnum); | |
2065 | return -EINVAL; | |
2066 | } | |
2067 | ||
2068 | mddev->pers = pers[pnum]; | |
2069 | spin_unlock(&pers_lock); | |
2070 | ||
657390d2 | 2071 | mddev->recovery = 0; |
1da177e4 | 2072 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 2073 | mddev->barriers_work = 1; |
6ff8d8ec | 2074 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 2075 | |
f91de92e N |
2076 | if (start_readonly) |
2077 | mddev->ro = 2; /* read-only, but switch on first write */ | |
2078 | ||
b15c2e57 N |
2079 | err = mddev->pers->run(mddev); |
2080 | if (!err && mddev->pers->sync_request) { | |
2081 | err = bitmap_create(mddev); | |
2082 | if (err) { | |
2083 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
2084 | mdname(mddev), err); | |
2085 | mddev->pers->stop(mddev); | |
2086 | } | |
2087 | } | |
1da177e4 LT |
2088 | if (err) { |
2089 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
2090 | module_put(mddev->pers->owner); | |
2091 | mddev->pers = NULL; | |
32a7627c N |
2092 | bitmap_destroy(mddev); |
2093 | return err; | |
1da177e4 | 2094 | } |
411036fa N |
2095 | if (mddev->pers->sync_request) |
2096 | sysfs_create_group(&mddev->kobj, &md_redundancy_group); | |
fd9d49ca N |
2097 | else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
2098 | mddev->ro = 0; | |
2099 | ||
1da177e4 LT |
2100 | atomic_set(&mddev->writes_pending,0); |
2101 | mddev->safemode = 0; | |
2102 | mddev->safemode_timer.function = md_safemode_timeout; | |
2103 | mddev->safemode_timer.data = (unsigned long) mddev; | |
2104 | mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ | |
2105 | mddev->in_sync = 1; | |
86e6ffdd N |
2106 | |
2107 | ITERATE_RDEV(mddev,rdev,tmp) | |
2108 | if (rdev->raid_disk >= 0) { | |
2109 | char nm[20]; | |
2110 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2111 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
2112 | } | |
1da177e4 LT |
2113 | |
2114 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2115 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2116 | |
2117 | if (mddev->sb_dirty) | |
2118 | md_update_sb(mddev); | |
2119 | ||
2120 | set_capacity(disk, mddev->array_size<<1); | |
2121 | ||
2122 | /* If we call blk_queue_make_request here, it will | |
2123 | * re-initialise max_sectors etc which may have been | |
2124 | * refined inside -> run. So just set the bits we need to set. | |
2125 | * Most initialisation happended when we called | |
2126 | * blk_queue_make_request(..., md_fail_request) | |
2127 | * earlier. | |
2128 | */ | |
2129 | mddev->queue->queuedata = mddev; | |
2130 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
2131 | ||
2132 | mddev->changed = 1; | |
d7603b7e | 2133 | md_new_event(mddev); |
1da177e4 LT |
2134 | return 0; |
2135 | } | |
2136 | ||
2137 | static int restart_array(mddev_t *mddev) | |
2138 | { | |
2139 | struct gendisk *disk = mddev->gendisk; | |
2140 | int err; | |
2141 | ||
2142 | /* | |
2143 | * Complain if it has no devices | |
2144 | */ | |
2145 | err = -ENXIO; | |
2146 | if (list_empty(&mddev->disks)) | |
2147 | goto out; | |
2148 | ||
2149 | if (mddev->pers) { | |
2150 | err = -EBUSY; | |
2151 | if (!mddev->ro) | |
2152 | goto out; | |
2153 | ||
2154 | mddev->safemode = 0; | |
2155 | mddev->ro = 0; | |
2156 | set_disk_ro(disk, 0); | |
2157 | ||
2158 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
2159 | mdname(mddev)); | |
2160 | /* | |
2161 | * Kick recovery or resync if necessary | |
2162 | */ | |
2163 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2164 | md_wakeup_thread(mddev->thread); | |
2165 | err = 0; | |
2166 | } else { | |
2167 | printk(KERN_ERR "md: %s has no personality assigned.\n", | |
2168 | mdname(mddev)); | |
2169 | err = -EINVAL; | |
2170 | } | |
2171 | ||
2172 | out: | |
2173 | return err; | |
2174 | } | |
2175 | ||
2176 | static int do_md_stop(mddev_t * mddev, int ro) | |
2177 | { | |
2178 | int err = 0; | |
2179 | struct gendisk *disk = mddev->gendisk; | |
2180 | ||
2181 | if (mddev->pers) { | |
2182 | if (atomic_read(&mddev->active)>2) { | |
2183 | printk("md: %s still in use.\n",mdname(mddev)); | |
2184 | return -EBUSY; | |
2185 | } | |
2186 | ||
2187 | if (mddev->sync_thread) { | |
2188 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2189 | md_unregister_thread(mddev->sync_thread); | |
2190 | mddev->sync_thread = NULL; | |
2191 | } | |
2192 | ||
2193 | del_timer_sync(&mddev->safemode_timer); | |
2194 | ||
2195 | invalidate_partition(disk, 0); | |
2196 | ||
2197 | if (ro) { | |
2198 | err = -ENXIO; | |
f91de92e | 2199 | if (mddev->ro==1) |
1da177e4 LT |
2200 | goto out; |
2201 | mddev->ro = 1; | |
2202 | } else { | |
6b8b3e8a | 2203 | bitmap_flush(mddev); |
a9701a30 | 2204 | md_super_wait(mddev); |
1da177e4 LT |
2205 | if (mddev->ro) |
2206 | set_disk_ro(disk, 0); | |
2207 | blk_queue_make_request(mddev->queue, md_fail_request); | |
2208 | mddev->pers->stop(mddev); | |
411036fa N |
2209 | if (mddev->pers->sync_request) |
2210 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
2211 | ||
1da177e4 LT |
2212 | module_put(mddev->pers->owner); |
2213 | mddev->pers = NULL; | |
2214 | if (mddev->ro) | |
2215 | mddev->ro = 0; | |
2216 | } | |
2217 | if (!mddev->in_sync) { | |
2218 | /* mark array as shutdown cleanly */ | |
2219 | mddev->in_sync = 1; | |
2220 | md_update_sb(mddev); | |
2221 | } | |
2222 | if (ro) | |
2223 | set_disk_ro(disk, 1); | |
2224 | } | |
32a7627c N |
2225 | |
2226 | bitmap_destroy(mddev); | |
2227 | if (mddev->bitmap_file) { | |
2228 | atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1); | |
2229 | fput(mddev->bitmap_file); | |
2230 | mddev->bitmap_file = NULL; | |
2231 | } | |
9223214e | 2232 | mddev->bitmap_offset = 0; |
32a7627c | 2233 | |
1da177e4 LT |
2234 | /* |
2235 | * Free resources if final stop | |
2236 | */ | |
2237 | if (!ro) { | |
86e6ffdd N |
2238 | mdk_rdev_t *rdev; |
2239 | struct list_head *tmp; | |
1da177e4 LT |
2240 | struct gendisk *disk; |
2241 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); | |
2242 | ||
86e6ffdd N |
2243 | ITERATE_RDEV(mddev,rdev,tmp) |
2244 | if (rdev->raid_disk >= 0) { | |
2245 | char nm[20]; | |
2246 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2247 | sysfs_remove_link(&mddev->kobj, nm); | |
2248 | } | |
2249 | ||
1da177e4 LT |
2250 | export_array(mddev); |
2251 | ||
2252 | mddev->array_size = 0; | |
2253 | disk = mddev->gendisk; | |
2254 | if (disk) | |
2255 | set_capacity(disk, 0); | |
2256 | mddev->changed = 1; | |
2257 | } else | |
2258 | printk(KERN_INFO "md: %s switched to read-only mode.\n", | |
2259 | mdname(mddev)); | |
2260 | err = 0; | |
d7603b7e | 2261 | md_new_event(mddev); |
1da177e4 LT |
2262 | out: |
2263 | return err; | |
2264 | } | |
2265 | ||
2266 | static void autorun_array(mddev_t *mddev) | |
2267 | { | |
2268 | mdk_rdev_t *rdev; | |
2269 | struct list_head *tmp; | |
2270 | int err; | |
2271 | ||
a757e64c | 2272 | if (list_empty(&mddev->disks)) |
1da177e4 | 2273 | return; |
1da177e4 LT |
2274 | |
2275 | printk(KERN_INFO "md: running: "); | |
2276 | ||
2277 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2278 | char b[BDEVNAME_SIZE]; | |
2279 | printk("<%s>", bdevname(rdev->bdev,b)); | |
2280 | } | |
2281 | printk("\n"); | |
2282 | ||
2283 | err = do_md_run (mddev); | |
2284 | if (err) { | |
2285 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
2286 | do_md_stop (mddev, 0); | |
2287 | } | |
2288 | } | |
2289 | ||
2290 | /* | |
2291 | * lets try to run arrays based on all disks that have arrived | |
2292 | * until now. (those are in pending_raid_disks) | |
2293 | * | |
2294 | * the method: pick the first pending disk, collect all disks with | |
2295 | * the same UUID, remove all from the pending list and put them into | |
2296 | * the 'same_array' list. Then order this list based on superblock | |
2297 | * update time (freshest comes first), kick out 'old' disks and | |
2298 | * compare superblocks. If everything's fine then run it. | |
2299 | * | |
2300 | * If "unit" is allocated, then bump its reference count | |
2301 | */ | |
2302 | static void autorun_devices(int part) | |
2303 | { | |
2304 | struct list_head candidates; | |
2305 | struct list_head *tmp; | |
2306 | mdk_rdev_t *rdev0, *rdev; | |
2307 | mddev_t *mddev; | |
2308 | char b[BDEVNAME_SIZE]; | |
2309 | ||
2310 | printk(KERN_INFO "md: autorun ...\n"); | |
2311 | while (!list_empty(&pending_raid_disks)) { | |
2312 | dev_t dev; | |
2313 | rdev0 = list_entry(pending_raid_disks.next, | |
2314 | mdk_rdev_t, same_set); | |
2315 | ||
2316 | printk(KERN_INFO "md: considering %s ...\n", | |
2317 | bdevname(rdev0->bdev,b)); | |
2318 | INIT_LIST_HEAD(&candidates); | |
2319 | ITERATE_RDEV_PENDING(rdev,tmp) | |
2320 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
2321 | printk(KERN_INFO "md: adding %s ...\n", | |
2322 | bdevname(rdev->bdev,b)); | |
2323 | list_move(&rdev->same_set, &candidates); | |
2324 | } | |
2325 | /* | |
2326 | * now we have a set of devices, with all of them having | |
2327 | * mostly sane superblocks. It's time to allocate the | |
2328 | * mddev. | |
2329 | */ | |
2330 | if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { | |
2331 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", | |
2332 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
2333 | break; | |
2334 | } | |
2335 | if (part) | |
2336 | dev = MKDEV(mdp_major, | |
2337 | rdev0->preferred_minor << MdpMinorShift); | |
2338 | else | |
2339 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
2340 | ||
2341 | md_probe(dev, NULL, NULL); | |
2342 | mddev = mddev_find(dev); | |
2343 | if (!mddev) { | |
2344 | printk(KERN_ERR | |
2345 | "md: cannot allocate memory for md drive.\n"); | |
2346 | break; | |
2347 | } | |
2348 | if (mddev_lock(mddev)) | |
2349 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
2350 | mdname(mddev)); | |
2351 | else if (mddev->raid_disks || mddev->major_version | |
2352 | || !list_empty(&mddev->disks)) { | |
2353 | printk(KERN_WARNING | |
2354 | "md: %s already running, cannot run %s\n", | |
2355 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
2356 | mddev_unlock(mddev); | |
2357 | } else { | |
2358 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
2359 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { | |
2360 | list_del_init(&rdev->same_set); | |
2361 | if (bind_rdev_to_array(rdev, mddev)) | |
2362 | export_rdev(rdev); | |
2363 | } | |
2364 | autorun_array(mddev); | |
2365 | mddev_unlock(mddev); | |
2366 | } | |
2367 | /* on success, candidates will be empty, on error | |
2368 | * it won't... | |
2369 | */ | |
2370 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) | |
2371 | export_rdev(rdev); | |
2372 | mddev_put(mddev); | |
2373 | } | |
2374 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
2375 | } | |
2376 | ||
2377 | /* | |
2378 | * import RAID devices based on one partition | |
2379 | * if possible, the array gets run as well. | |
2380 | */ | |
2381 | ||
2382 | static int autostart_array(dev_t startdev) | |
2383 | { | |
2384 | char b[BDEVNAME_SIZE]; | |
2385 | int err = -EINVAL, i; | |
2386 | mdp_super_t *sb = NULL; | |
2387 | mdk_rdev_t *start_rdev = NULL, *rdev; | |
2388 | ||
2389 | start_rdev = md_import_device(startdev, 0, 0); | |
2390 | if (IS_ERR(start_rdev)) | |
2391 | return err; | |
2392 | ||
2393 | ||
2394 | /* NOTE: this can only work for 0.90.0 superblocks */ | |
2395 | sb = (mdp_super_t*)page_address(start_rdev->sb_page); | |
2396 | if (sb->major_version != 0 || | |
2397 | sb->minor_version != 90 ) { | |
2398 | printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); | |
2399 | export_rdev(start_rdev); | |
2400 | return err; | |
2401 | } | |
2402 | ||
b2d444d7 | 2403 | if (test_bit(Faulty, &start_rdev->flags)) { |
1da177e4 LT |
2404 | printk(KERN_WARNING |
2405 | "md: can not autostart based on faulty %s!\n", | |
2406 | bdevname(start_rdev->bdev,b)); | |
2407 | export_rdev(start_rdev); | |
2408 | return err; | |
2409 | } | |
2410 | list_add(&start_rdev->same_set, &pending_raid_disks); | |
2411 | ||
2412 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2413 | mdp_disk_t *desc = sb->disks + i; | |
2414 | dev_t dev = MKDEV(desc->major, desc->minor); | |
2415 | ||
2416 | if (!dev) | |
2417 | continue; | |
2418 | if (dev == startdev) | |
2419 | continue; | |
2420 | if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) | |
2421 | continue; | |
2422 | rdev = md_import_device(dev, 0, 0); | |
2423 | if (IS_ERR(rdev)) | |
2424 | continue; | |
2425 | ||
2426 | list_add(&rdev->same_set, &pending_raid_disks); | |
2427 | } | |
2428 | ||
2429 | /* | |
2430 | * possibly return codes | |
2431 | */ | |
2432 | autorun_devices(0); | |
2433 | return 0; | |
2434 | ||
2435 | } | |
2436 | ||
2437 | ||
2438 | static int get_version(void __user * arg) | |
2439 | { | |
2440 | mdu_version_t ver; | |
2441 | ||
2442 | ver.major = MD_MAJOR_VERSION; | |
2443 | ver.minor = MD_MINOR_VERSION; | |
2444 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
2445 | ||
2446 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
2447 | return -EFAULT; | |
2448 | ||
2449 | return 0; | |
2450 | } | |
2451 | ||
2452 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
2453 | { | |
2454 | mdu_array_info_t info; | |
2455 | int nr,working,active,failed,spare; | |
2456 | mdk_rdev_t *rdev; | |
2457 | struct list_head *tmp; | |
2458 | ||
2459 | nr=working=active=failed=spare=0; | |
2460 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2461 | nr++; | |
b2d444d7 | 2462 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2463 | failed++; |
2464 | else { | |
2465 | working++; | |
b2d444d7 | 2466 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
2467 | active++; |
2468 | else | |
2469 | spare++; | |
2470 | } | |
2471 | } | |
2472 | ||
2473 | info.major_version = mddev->major_version; | |
2474 | info.minor_version = mddev->minor_version; | |
2475 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
2476 | info.ctime = mddev->ctime; | |
2477 | info.level = mddev->level; | |
2478 | info.size = mddev->size; | |
2479 | info.nr_disks = nr; | |
2480 | info.raid_disks = mddev->raid_disks; | |
2481 | info.md_minor = mddev->md_minor; | |
2482 | info.not_persistent= !mddev->persistent; | |
2483 | ||
2484 | info.utime = mddev->utime; | |
2485 | info.state = 0; | |
2486 | if (mddev->in_sync) | |
2487 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
2488 | if (mddev->bitmap && mddev->bitmap_offset) |
2489 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
2490 | info.active_disks = active; |
2491 | info.working_disks = working; | |
2492 | info.failed_disks = failed; | |
2493 | info.spare_disks = spare; | |
2494 | ||
2495 | info.layout = mddev->layout; | |
2496 | info.chunk_size = mddev->chunk_size; | |
2497 | ||
2498 | if (copy_to_user(arg, &info, sizeof(info))) | |
2499 | return -EFAULT; | |
2500 | ||
2501 | return 0; | |
2502 | } | |
2503 | ||
87162a28 | 2504 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
2505 | { |
2506 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
2507 | char *ptr, *buf = NULL; | |
2508 | int err = -ENOMEM; | |
2509 | ||
2510 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2511 | if (!file) | |
2512 | goto out; | |
2513 | ||
2514 | /* bitmap disabled, zero the first byte and copy out */ | |
2515 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
2516 | file->pathname[0] = '\0'; | |
2517 | goto copy_out; | |
2518 | } | |
2519 | ||
2520 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
2521 | if (!buf) | |
2522 | goto out; | |
2523 | ||
2524 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
2525 | if (!ptr) | |
2526 | goto out; | |
2527 | ||
2528 | strcpy(file->pathname, ptr); | |
2529 | ||
2530 | copy_out: | |
2531 | err = 0; | |
2532 | if (copy_to_user(arg, file, sizeof(*file))) | |
2533 | err = -EFAULT; | |
2534 | out: | |
2535 | kfree(buf); | |
2536 | kfree(file); | |
2537 | return err; | |
2538 | } | |
2539 | ||
1da177e4 LT |
2540 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
2541 | { | |
2542 | mdu_disk_info_t info; | |
2543 | unsigned int nr; | |
2544 | mdk_rdev_t *rdev; | |
2545 | ||
2546 | if (copy_from_user(&info, arg, sizeof(info))) | |
2547 | return -EFAULT; | |
2548 | ||
2549 | nr = info.number; | |
2550 | ||
2551 | rdev = find_rdev_nr(mddev, nr); | |
2552 | if (rdev) { | |
2553 | info.major = MAJOR(rdev->bdev->bd_dev); | |
2554 | info.minor = MINOR(rdev->bdev->bd_dev); | |
2555 | info.raid_disk = rdev->raid_disk; | |
2556 | info.state = 0; | |
b2d444d7 | 2557 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 2558 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 2559 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2560 | info.state |= (1<<MD_DISK_ACTIVE); |
2561 | info.state |= (1<<MD_DISK_SYNC); | |
2562 | } | |
8ddf9efe N |
2563 | if (test_bit(WriteMostly, &rdev->flags)) |
2564 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
2565 | } else { |
2566 | info.major = info.minor = 0; | |
2567 | info.raid_disk = -1; | |
2568 | info.state = (1<<MD_DISK_REMOVED); | |
2569 | } | |
2570 | ||
2571 | if (copy_to_user(arg, &info, sizeof(info))) | |
2572 | return -EFAULT; | |
2573 | ||
2574 | return 0; | |
2575 | } | |
2576 | ||
2577 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
2578 | { | |
2579 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
2580 | mdk_rdev_t *rdev; | |
2581 | dev_t dev = MKDEV(info->major,info->minor); | |
2582 | ||
2583 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
2584 | return -EOVERFLOW; | |
2585 | ||
2586 | if (!mddev->raid_disks) { | |
2587 | int err; | |
2588 | /* expecting a device which has a superblock */ | |
2589 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
2590 | if (IS_ERR(rdev)) { | |
2591 | printk(KERN_WARNING | |
2592 | "md: md_import_device returned %ld\n", | |
2593 | PTR_ERR(rdev)); | |
2594 | return PTR_ERR(rdev); | |
2595 | } | |
2596 | if (!list_empty(&mddev->disks)) { | |
2597 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2598 | mdk_rdev_t, same_set); | |
2599 | int err = super_types[mddev->major_version] | |
2600 | .load_super(rdev, rdev0, mddev->minor_version); | |
2601 | if (err < 0) { | |
2602 | printk(KERN_WARNING | |
2603 | "md: %s has different UUID to %s\n", | |
2604 | bdevname(rdev->bdev,b), | |
2605 | bdevname(rdev0->bdev,b2)); | |
2606 | export_rdev(rdev); | |
2607 | return -EINVAL; | |
2608 | } | |
2609 | } | |
2610 | err = bind_rdev_to_array(rdev, mddev); | |
2611 | if (err) | |
2612 | export_rdev(rdev); | |
2613 | return err; | |
2614 | } | |
2615 | ||
2616 | /* | |
2617 | * add_new_disk can be used once the array is assembled | |
2618 | * to add "hot spares". They must already have a superblock | |
2619 | * written | |
2620 | */ | |
2621 | if (mddev->pers) { | |
2622 | int err; | |
2623 | if (!mddev->pers->hot_add_disk) { | |
2624 | printk(KERN_WARNING | |
2625 | "%s: personality does not support diskops!\n", | |
2626 | mdname(mddev)); | |
2627 | return -EINVAL; | |
2628 | } | |
7b1e35f6 N |
2629 | if (mddev->persistent) |
2630 | rdev = md_import_device(dev, mddev->major_version, | |
2631 | mddev->minor_version); | |
2632 | else | |
2633 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
2634 | if (IS_ERR(rdev)) { |
2635 | printk(KERN_WARNING | |
2636 | "md: md_import_device returned %ld\n", | |
2637 | PTR_ERR(rdev)); | |
2638 | return PTR_ERR(rdev); | |
2639 | } | |
41158c7e N |
2640 | /* set save_raid_disk if appropriate */ |
2641 | if (!mddev->persistent) { | |
2642 | if (info->state & (1<<MD_DISK_SYNC) && | |
2643 | info->raid_disk < mddev->raid_disks) | |
2644 | rdev->raid_disk = info->raid_disk; | |
2645 | else | |
2646 | rdev->raid_disk = -1; | |
2647 | } else | |
2648 | super_types[mddev->major_version]. | |
2649 | validate_super(mddev, rdev); | |
2650 | rdev->saved_raid_disk = rdev->raid_disk; | |
2651 | ||
b2d444d7 | 2652 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
2653 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
2654 | set_bit(WriteMostly, &rdev->flags); | |
2655 | ||
1da177e4 LT |
2656 | rdev->raid_disk = -1; |
2657 | err = bind_rdev_to_array(rdev, mddev); | |
2658 | if (err) | |
2659 | export_rdev(rdev); | |
c361777f N |
2660 | |
2661 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2662 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2663 | return err; |
2664 | } | |
2665 | ||
2666 | /* otherwise, add_new_disk is only allowed | |
2667 | * for major_version==0 superblocks | |
2668 | */ | |
2669 | if (mddev->major_version != 0) { | |
2670 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
2671 | mdname(mddev)); | |
2672 | return -EINVAL; | |
2673 | } | |
2674 | ||
2675 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
2676 | int err; | |
2677 | rdev = md_import_device (dev, -1, 0); | |
2678 | if (IS_ERR(rdev)) { | |
2679 | printk(KERN_WARNING | |
2680 | "md: error, md_import_device() returned %ld\n", | |
2681 | PTR_ERR(rdev)); | |
2682 | return PTR_ERR(rdev); | |
2683 | } | |
2684 | rdev->desc_nr = info->number; | |
2685 | if (info->raid_disk < mddev->raid_disks) | |
2686 | rdev->raid_disk = info->raid_disk; | |
2687 | else | |
2688 | rdev->raid_disk = -1; | |
2689 | ||
b2d444d7 N |
2690 | rdev->flags = 0; |
2691 | ||
1da177e4 | 2692 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
2693 | if (info->state & (1<<MD_DISK_SYNC)) |
2694 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 2695 | |
8ddf9efe N |
2696 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
2697 | set_bit(WriteMostly, &rdev->flags); | |
2698 | ||
1da177e4 LT |
2699 | err = bind_rdev_to_array(rdev, mddev); |
2700 | if (err) { | |
2701 | export_rdev(rdev); | |
2702 | return err; | |
2703 | } | |
2704 | ||
2705 | if (!mddev->persistent) { | |
2706 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
2707 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2708 | } else | |
2709 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
2710 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
2711 | ||
2712 | if (!mddev->size || (mddev->size > rdev->size)) | |
2713 | mddev->size = rdev->size; | |
2714 | } | |
2715 | ||
2716 | return 0; | |
2717 | } | |
2718 | ||
2719 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
2720 | { | |
2721 | char b[BDEVNAME_SIZE]; | |
2722 | mdk_rdev_t *rdev; | |
2723 | ||
2724 | if (!mddev->pers) | |
2725 | return -ENODEV; | |
2726 | ||
2727 | rdev = find_rdev(mddev, dev); | |
2728 | if (!rdev) | |
2729 | return -ENXIO; | |
2730 | ||
2731 | if (rdev->raid_disk >= 0) | |
2732 | goto busy; | |
2733 | ||
2734 | kick_rdev_from_array(rdev); | |
2735 | md_update_sb(mddev); | |
d7603b7e | 2736 | md_new_event(mddev); |
1da177e4 LT |
2737 | |
2738 | return 0; | |
2739 | busy: | |
2740 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", | |
2741 | bdevname(rdev->bdev,b), mdname(mddev)); | |
2742 | return -EBUSY; | |
2743 | } | |
2744 | ||
2745 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
2746 | { | |
2747 | char b[BDEVNAME_SIZE]; | |
2748 | int err; | |
2749 | unsigned int size; | |
2750 | mdk_rdev_t *rdev; | |
2751 | ||
2752 | if (!mddev->pers) | |
2753 | return -ENODEV; | |
2754 | ||
2755 | if (mddev->major_version != 0) { | |
2756 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
2757 | " version-0 superblocks.\n", | |
2758 | mdname(mddev)); | |
2759 | return -EINVAL; | |
2760 | } | |
2761 | if (!mddev->pers->hot_add_disk) { | |
2762 | printk(KERN_WARNING | |
2763 | "%s: personality does not support diskops!\n", | |
2764 | mdname(mddev)); | |
2765 | return -EINVAL; | |
2766 | } | |
2767 | ||
2768 | rdev = md_import_device (dev, -1, 0); | |
2769 | if (IS_ERR(rdev)) { | |
2770 | printk(KERN_WARNING | |
2771 | "md: error, md_import_device() returned %ld\n", | |
2772 | PTR_ERR(rdev)); | |
2773 | return -EINVAL; | |
2774 | } | |
2775 | ||
2776 | if (mddev->persistent) | |
2777 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
2778 | else | |
2779 | rdev->sb_offset = | |
2780 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2781 | ||
2782 | size = calc_dev_size(rdev, mddev->chunk_size); | |
2783 | rdev->size = size; | |
2784 | ||
2785 | if (size < mddev->size) { | |
2786 | printk(KERN_WARNING | |
2787 | "%s: disk size %llu blocks < array size %llu\n", | |
2788 | mdname(mddev), (unsigned long long)size, | |
2789 | (unsigned long long)mddev->size); | |
2790 | err = -ENOSPC; | |
2791 | goto abort_export; | |
2792 | } | |
2793 | ||
b2d444d7 | 2794 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
2795 | printk(KERN_WARNING |
2796 | "md: can not hot-add faulty %s disk to %s!\n", | |
2797 | bdevname(rdev->bdev,b), mdname(mddev)); | |
2798 | err = -EINVAL; | |
2799 | goto abort_export; | |
2800 | } | |
b2d444d7 | 2801 | clear_bit(In_sync, &rdev->flags); |
1da177e4 LT |
2802 | rdev->desc_nr = -1; |
2803 | bind_rdev_to_array(rdev, mddev); | |
2804 | ||
2805 | /* | |
2806 | * The rest should better be atomic, we can have disk failures | |
2807 | * noticed in interrupt contexts ... | |
2808 | */ | |
2809 | ||
2810 | if (rdev->desc_nr == mddev->max_disks) { | |
2811 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
2812 | mdname(mddev)); | |
2813 | err = -EBUSY; | |
2814 | goto abort_unbind_export; | |
2815 | } | |
2816 | ||
2817 | rdev->raid_disk = -1; | |
2818 | ||
2819 | md_update_sb(mddev); | |
2820 | ||
2821 | /* | |
2822 | * Kick recovery, maybe this spare has to be added to the | |
2823 | * array immediately. | |
2824 | */ | |
2825 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2826 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 2827 | md_new_event(mddev); |
1da177e4 LT |
2828 | return 0; |
2829 | ||
2830 | abort_unbind_export: | |
2831 | unbind_rdev_from_array(rdev); | |
2832 | ||
2833 | abort_export: | |
2834 | export_rdev(rdev); | |
2835 | return err; | |
2836 | } | |
2837 | ||
32a7627c N |
2838 | /* similar to deny_write_access, but accounts for our holding a reference |
2839 | * to the file ourselves */ | |
2840 | static int deny_bitmap_write_access(struct file * file) | |
2841 | { | |
2842 | struct inode *inode = file->f_mapping->host; | |
2843 | ||
2844 | spin_lock(&inode->i_lock); | |
2845 | if (atomic_read(&inode->i_writecount) > 1) { | |
2846 | spin_unlock(&inode->i_lock); | |
2847 | return -ETXTBSY; | |
2848 | } | |
2849 | atomic_set(&inode->i_writecount, -1); | |
2850 | spin_unlock(&inode->i_lock); | |
2851 | ||
2852 | return 0; | |
2853 | } | |
2854 | ||
2855 | static int set_bitmap_file(mddev_t *mddev, int fd) | |
2856 | { | |
2857 | int err; | |
2858 | ||
36fa3063 N |
2859 | if (mddev->pers) { |
2860 | if (!mddev->pers->quiesce) | |
2861 | return -EBUSY; | |
2862 | if (mddev->recovery || mddev->sync_thread) | |
2863 | return -EBUSY; | |
2864 | /* we should be able to change the bitmap.. */ | |
2865 | } | |
32a7627c | 2866 | |
32a7627c | 2867 | |
36fa3063 N |
2868 | if (fd >= 0) { |
2869 | if (mddev->bitmap) | |
2870 | return -EEXIST; /* cannot add when bitmap is present */ | |
2871 | mddev->bitmap_file = fget(fd); | |
32a7627c | 2872 | |
36fa3063 N |
2873 | if (mddev->bitmap_file == NULL) { |
2874 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
2875 | mdname(mddev)); | |
2876 | return -EBADF; | |
2877 | } | |
2878 | ||
2879 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
2880 | if (err) { | |
2881 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
2882 | mdname(mddev)); | |
2883 | fput(mddev->bitmap_file); | |
2884 | mddev->bitmap_file = NULL; | |
2885 | return err; | |
2886 | } | |
a654b9d8 | 2887 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
2888 | } else if (mddev->bitmap == NULL) |
2889 | return -ENOENT; /* cannot remove what isn't there */ | |
2890 | err = 0; | |
2891 | if (mddev->pers) { | |
2892 | mddev->pers->quiesce(mddev, 1); | |
2893 | if (fd >= 0) | |
2894 | err = bitmap_create(mddev); | |
2895 | if (fd < 0 || err) | |
2896 | bitmap_destroy(mddev); | |
2897 | mddev->pers->quiesce(mddev, 0); | |
2898 | } else if (fd < 0) { | |
2899 | if (mddev->bitmap_file) | |
2900 | fput(mddev->bitmap_file); | |
2901 | mddev->bitmap_file = NULL; | |
2902 | } | |
2903 | ||
32a7627c N |
2904 | return err; |
2905 | } | |
2906 | ||
1da177e4 LT |
2907 | /* |
2908 | * set_array_info is used two different ways | |
2909 | * The original usage is when creating a new array. | |
2910 | * In this usage, raid_disks is > 0 and it together with | |
2911 | * level, size, not_persistent,layout,chunksize determine the | |
2912 | * shape of the array. | |
2913 | * This will always create an array with a type-0.90.0 superblock. | |
2914 | * The newer usage is when assembling an array. | |
2915 | * In this case raid_disks will be 0, and the major_version field is | |
2916 | * use to determine which style super-blocks are to be found on the devices. | |
2917 | * The minor and patch _version numbers are also kept incase the | |
2918 | * super_block handler wishes to interpret them. | |
2919 | */ | |
2920 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
2921 | { | |
2922 | ||
2923 | if (info->raid_disks == 0) { | |
2924 | /* just setting version number for superblock loading */ | |
2925 | if (info->major_version < 0 || | |
2926 | info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || | |
2927 | super_types[info->major_version].name == NULL) { | |
2928 | /* maybe try to auto-load a module? */ | |
2929 | printk(KERN_INFO | |
2930 | "md: superblock version %d not known\n", | |
2931 | info->major_version); | |
2932 | return -EINVAL; | |
2933 | } | |
2934 | mddev->major_version = info->major_version; | |
2935 | mddev->minor_version = info->minor_version; | |
2936 | mddev->patch_version = info->patch_version; | |
2937 | return 0; | |
2938 | } | |
2939 | mddev->major_version = MD_MAJOR_VERSION; | |
2940 | mddev->minor_version = MD_MINOR_VERSION; | |
2941 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
2942 | mddev->ctime = get_seconds(); | |
2943 | ||
2944 | mddev->level = info->level; | |
2945 | mddev->size = info->size; | |
2946 | mddev->raid_disks = info->raid_disks; | |
2947 | /* don't set md_minor, it is determined by which /dev/md* was | |
2948 | * openned | |
2949 | */ | |
2950 | if (info->state & (1<<MD_SB_CLEAN)) | |
2951 | mddev->recovery_cp = MaxSector; | |
2952 | else | |
2953 | mddev->recovery_cp = 0; | |
2954 | mddev->persistent = ! info->not_persistent; | |
2955 | ||
2956 | mddev->layout = info->layout; | |
2957 | mddev->chunk_size = info->chunk_size; | |
2958 | ||
2959 | mddev->max_disks = MD_SB_DISKS; | |
2960 | ||
2961 | mddev->sb_dirty = 1; | |
2962 | ||
b2a2703c N |
2963 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
2964 | mddev->bitmap_offset = 0; | |
2965 | ||
1da177e4 LT |
2966 | /* |
2967 | * Generate a 128 bit UUID | |
2968 | */ | |
2969 | get_random_bytes(mddev->uuid, 16); | |
2970 | ||
2971 | return 0; | |
2972 | } | |
2973 | ||
2974 | /* | |
2975 | * update_array_info is used to change the configuration of an | |
2976 | * on-line array. | |
2977 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
2978 | * fields in the info are checked against the array. | |
2979 | * Any differences that cannot be handled will cause an error. | |
2980 | * Normally, only one change can be managed at a time. | |
2981 | */ | |
2982 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
2983 | { | |
2984 | int rv = 0; | |
2985 | int cnt = 0; | |
36fa3063 N |
2986 | int state = 0; |
2987 | ||
2988 | /* calculate expected state,ignoring low bits */ | |
2989 | if (mddev->bitmap && mddev->bitmap_offset) | |
2990 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
2991 | |
2992 | if (mddev->major_version != info->major_version || | |
2993 | mddev->minor_version != info->minor_version || | |
2994 | /* mddev->patch_version != info->patch_version || */ | |
2995 | mddev->ctime != info->ctime || | |
2996 | mddev->level != info->level || | |
2997 | /* mddev->layout != info->layout || */ | |
2998 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
2999 | mddev->chunk_size != info->chunk_size || |
3000 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
3001 | ((state^info->state) & 0xfffffe00) | |
3002 | ) | |
1da177e4 LT |
3003 | return -EINVAL; |
3004 | /* Check there is only one change */ | |
3005 | if (mddev->size != info->size) cnt++; | |
3006 | if (mddev->raid_disks != info->raid_disks) cnt++; | |
3007 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 3008 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
3009 | if (cnt == 0) return 0; |
3010 | if (cnt > 1) return -EINVAL; | |
3011 | ||
3012 | if (mddev->layout != info->layout) { | |
3013 | /* Change layout | |
3014 | * we don't need to do anything at the md level, the | |
3015 | * personality will take care of it all. | |
3016 | */ | |
3017 | if (mddev->pers->reconfig == NULL) | |
3018 | return -EINVAL; | |
3019 | else | |
3020 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
3021 | } | |
3022 | if (mddev->size != info->size) { | |
3023 | mdk_rdev_t * rdev; | |
3024 | struct list_head *tmp; | |
3025 | if (mddev->pers->resize == NULL) | |
3026 | return -EINVAL; | |
3027 | /* The "size" is the amount of each device that is used. | |
3028 | * This can only make sense for arrays with redundancy. | |
3029 | * linear and raid0 always use whatever space is available | |
3030 | * We can only consider changing the size if no resync | |
3031 | * or reconstruction is happening, and if the new size | |
3032 | * is acceptable. It must fit before the sb_offset or, | |
3033 | * if that is <data_offset, it must fit before the | |
3034 | * size of each device. | |
3035 | * If size is zero, we find the largest size that fits. | |
3036 | */ | |
3037 | if (mddev->sync_thread) | |
3038 | return -EBUSY; | |
3039 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3040 | sector_t avail; | |
3041 | int fit = (info->size == 0); | |
3042 | if (rdev->sb_offset > rdev->data_offset) | |
3043 | avail = (rdev->sb_offset*2) - rdev->data_offset; | |
3044 | else | |
3045 | avail = get_capacity(rdev->bdev->bd_disk) | |
3046 | - rdev->data_offset; | |
3047 | if (fit && (info->size == 0 || info->size > avail/2)) | |
3048 | info->size = avail/2; | |
3049 | if (avail < ((sector_t)info->size << 1)) | |
3050 | return -ENOSPC; | |
3051 | } | |
3052 | rv = mddev->pers->resize(mddev, (sector_t)info->size *2); | |
3053 | if (!rv) { | |
3054 | struct block_device *bdev; | |
3055 | ||
3056 | bdev = bdget_disk(mddev->gendisk, 0); | |
3057 | if (bdev) { | |
3058 | down(&bdev->bd_inode->i_sem); | |
3059 | i_size_write(bdev->bd_inode, mddev->array_size << 10); | |
3060 | up(&bdev->bd_inode->i_sem); | |
3061 | bdput(bdev); | |
3062 | } | |
3063 | } | |
3064 | } | |
3065 | if (mddev->raid_disks != info->raid_disks) { | |
3066 | /* change the number of raid disks */ | |
3067 | if (mddev->pers->reshape == NULL) | |
3068 | return -EINVAL; | |
3069 | if (info->raid_disks <= 0 || | |
3070 | info->raid_disks >= mddev->max_disks) | |
3071 | return -EINVAL; | |
3072 | if (mddev->sync_thread) | |
3073 | return -EBUSY; | |
3074 | rv = mddev->pers->reshape(mddev, info->raid_disks); | |
3075 | if (!rv) { | |
3076 | struct block_device *bdev; | |
3077 | ||
3078 | bdev = bdget_disk(mddev->gendisk, 0); | |
3079 | if (bdev) { | |
3080 | down(&bdev->bd_inode->i_sem); | |
3081 | i_size_write(bdev->bd_inode, mddev->array_size << 10); | |
3082 | up(&bdev->bd_inode->i_sem); | |
3083 | bdput(bdev); | |
3084 | } | |
3085 | } | |
3086 | } | |
36fa3063 N |
3087 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
3088 | if (mddev->pers->quiesce == NULL) | |
3089 | return -EINVAL; | |
3090 | if (mddev->recovery || mddev->sync_thread) | |
3091 | return -EBUSY; | |
3092 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
3093 | /* add the bitmap */ | |
3094 | if (mddev->bitmap) | |
3095 | return -EEXIST; | |
3096 | if (mddev->default_bitmap_offset == 0) | |
3097 | return -EINVAL; | |
3098 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
3099 | mddev->pers->quiesce(mddev, 1); | |
3100 | rv = bitmap_create(mddev); | |
3101 | if (rv) | |
3102 | bitmap_destroy(mddev); | |
3103 | mddev->pers->quiesce(mddev, 0); | |
3104 | } else { | |
3105 | /* remove the bitmap */ | |
3106 | if (!mddev->bitmap) | |
3107 | return -ENOENT; | |
3108 | if (mddev->bitmap->file) | |
3109 | return -EINVAL; | |
3110 | mddev->pers->quiesce(mddev, 1); | |
3111 | bitmap_destroy(mddev); | |
3112 | mddev->pers->quiesce(mddev, 0); | |
3113 | mddev->bitmap_offset = 0; | |
3114 | } | |
3115 | } | |
1da177e4 LT |
3116 | md_update_sb(mddev); |
3117 | return rv; | |
3118 | } | |
3119 | ||
3120 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
3121 | { | |
3122 | mdk_rdev_t *rdev; | |
3123 | ||
3124 | if (mddev->pers == NULL) | |
3125 | return -ENODEV; | |
3126 | ||
3127 | rdev = find_rdev(mddev, dev); | |
3128 | if (!rdev) | |
3129 | return -ENODEV; | |
3130 | ||
3131 | md_error(mddev, rdev); | |
3132 | return 0; | |
3133 | } | |
3134 | ||
3135 | static int md_ioctl(struct inode *inode, struct file *file, | |
3136 | unsigned int cmd, unsigned long arg) | |
3137 | { | |
3138 | int err = 0; | |
3139 | void __user *argp = (void __user *)arg; | |
3140 | struct hd_geometry __user *loc = argp; | |
3141 | mddev_t *mddev = NULL; | |
3142 | ||
3143 | if (!capable(CAP_SYS_ADMIN)) | |
3144 | return -EACCES; | |
3145 | ||
3146 | /* | |
3147 | * Commands dealing with the RAID driver but not any | |
3148 | * particular array: | |
3149 | */ | |
3150 | switch (cmd) | |
3151 | { | |
3152 | case RAID_VERSION: | |
3153 | err = get_version(argp); | |
3154 | goto done; | |
3155 | ||
3156 | case PRINT_RAID_DEBUG: | |
3157 | err = 0; | |
3158 | md_print_devices(); | |
3159 | goto done; | |
3160 | ||
3161 | #ifndef MODULE | |
3162 | case RAID_AUTORUN: | |
3163 | err = 0; | |
3164 | autostart_arrays(arg); | |
3165 | goto done; | |
3166 | #endif | |
3167 | default:; | |
3168 | } | |
3169 | ||
3170 | /* | |
3171 | * Commands creating/starting a new array: | |
3172 | */ | |
3173 | ||
3174 | mddev = inode->i_bdev->bd_disk->private_data; | |
3175 | ||
3176 | if (!mddev) { | |
3177 | BUG(); | |
3178 | goto abort; | |
3179 | } | |
3180 | ||
3181 | ||
3182 | if (cmd == START_ARRAY) { | |
3183 | /* START_ARRAY doesn't need to lock the array as autostart_array | |
3184 | * does the locking, and it could even be a different array | |
3185 | */ | |
3186 | static int cnt = 3; | |
3187 | if (cnt > 0 ) { | |
3188 | printk(KERN_WARNING | |
3189 | "md: %s(pid %d) used deprecated START_ARRAY ioctl. " | |
e8a00334 | 3190 | "This will not be supported beyond July 2006\n", |
1da177e4 LT |
3191 | current->comm, current->pid); |
3192 | cnt--; | |
3193 | } | |
3194 | err = autostart_array(new_decode_dev(arg)); | |
3195 | if (err) { | |
3196 | printk(KERN_WARNING "md: autostart failed!\n"); | |
3197 | goto abort; | |
3198 | } | |
3199 | goto done; | |
3200 | } | |
3201 | ||
3202 | err = mddev_lock(mddev); | |
3203 | if (err) { | |
3204 | printk(KERN_INFO | |
3205 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
3206 | err, cmd); | |
3207 | goto abort; | |
3208 | } | |
3209 | ||
3210 | switch (cmd) | |
3211 | { | |
3212 | case SET_ARRAY_INFO: | |
3213 | { | |
3214 | mdu_array_info_t info; | |
3215 | if (!arg) | |
3216 | memset(&info, 0, sizeof(info)); | |
3217 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
3218 | err = -EFAULT; | |
3219 | goto abort_unlock; | |
3220 | } | |
3221 | if (mddev->pers) { | |
3222 | err = update_array_info(mddev, &info); | |
3223 | if (err) { | |
3224 | printk(KERN_WARNING "md: couldn't update" | |
3225 | " array info. %d\n", err); | |
3226 | goto abort_unlock; | |
3227 | } | |
3228 | goto done_unlock; | |
3229 | } | |
3230 | if (!list_empty(&mddev->disks)) { | |
3231 | printk(KERN_WARNING | |
3232 | "md: array %s already has disks!\n", | |
3233 | mdname(mddev)); | |
3234 | err = -EBUSY; | |
3235 | goto abort_unlock; | |
3236 | } | |
3237 | if (mddev->raid_disks) { | |
3238 | printk(KERN_WARNING | |
3239 | "md: array %s already initialised!\n", | |
3240 | mdname(mddev)); | |
3241 | err = -EBUSY; | |
3242 | goto abort_unlock; | |
3243 | } | |
3244 | err = set_array_info(mddev, &info); | |
3245 | if (err) { | |
3246 | printk(KERN_WARNING "md: couldn't set" | |
3247 | " array info. %d\n", err); | |
3248 | goto abort_unlock; | |
3249 | } | |
3250 | } | |
3251 | goto done_unlock; | |
3252 | ||
3253 | default:; | |
3254 | } | |
3255 | ||
3256 | /* | |
3257 | * Commands querying/configuring an existing array: | |
3258 | */ | |
32a7627c N |
3259 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3260 | * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ | |
3261 | if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
3262 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { | |
1da177e4 LT |
3263 | err = -ENODEV; |
3264 | goto abort_unlock; | |
3265 | } | |
3266 | ||
3267 | /* | |
3268 | * Commands even a read-only array can execute: | |
3269 | */ | |
3270 | switch (cmd) | |
3271 | { | |
3272 | case GET_ARRAY_INFO: | |
3273 | err = get_array_info(mddev, argp); | |
3274 | goto done_unlock; | |
3275 | ||
32a7627c | 3276 | case GET_BITMAP_FILE: |
87162a28 | 3277 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
3278 | goto done_unlock; |
3279 | ||
1da177e4 LT |
3280 | case GET_DISK_INFO: |
3281 | err = get_disk_info(mddev, argp); | |
3282 | goto done_unlock; | |
3283 | ||
3284 | case RESTART_ARRAY_RW: | |
3285 | err = restart_array(mddev); | |
3286 | goto done_unlock; | |
3287 | ||
3288 | case STOP_ARRAY: | |
3289 | err = do_md_stop (mddev, 0); | |
3290 | goto done_unlock; | |
3291 | ||
3292 | case STOP_ARRAY_RO: | |
3293 | err = do_md_stop (mddev, 1); | |
3294 | goto done_unlock; | |
3295 | ||
3296 | /* | |
3297 | * We have a problem here : there is no easy way to give a CHS | |
3298 | * virtual geometry. We currently pretend that we have a 2 heads | |
3299 | * 4 sectors (with a BIG number of cylinders...). This drives | |
3300 | * dosfs just mad... ;-) | |
3301 | */ | |
3302 | case HDIO_GETGEO: | |
3303 | if (!loc) { | |
3304 | err = -EINVAL; | |
3305 | goto abort_unlock; | |
3306 | } | |
3307 | err = put_user (2, (char __user *) &loc->heads); | |
3308 | if (err) | |
3309 | goto abort_unlock; | |
3310 | err = put_user (4, (char __user *) &loc->sectors); | |
3311 | if (err) | |
3312 | goto abort_unlock; | |
3313 | err = put_user(get_capacity(mddev->gendisk)/8, | |
3314 | (short __user *) &loc->cylinders); | |
3315 | if (err) | |
3316 | goto abort_unlock; | |
3317 | err = put_user (get_start_sect(inode->i_bdev), | |
3318 | (long __user *) &loc->start); | |
3319 | goto done_unlock; | |
3320 | } | |
3321 | ||
3322 | /* | |
3323 | * The remaining ioctls are changing the state of the | |
f91de92e N |
3324 | * superblock, so we do not allow them on read-only arrays. |
3325 | * However non-MD ioctls (e.g. get-size) will still come through | |
3326 | * here and hit the 'default' below, so only disallow | |
3327 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 3328 | */ |
f91de92e N |
3329 | if (_IOC_TYPE(cmd) == MD_MAJOR && |
3330 | mddev->ro && mddev->pers) { | |
3331 | if (mddev->ro == 2) { | |
3332 | mddev->ro = 0; | |
3333 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3334 | md_wakeup_thread(mddev->thread); | |
3335 | ||
3336 | } else { | |
3337 | err = -EROFS; | |
3338 | goto abort_unlock; | |
3339 | } | |
1da177e4 LT |
3340 | } |
3341 | ||
3342 | switch (cmd) | |
3343 | { | |
3344 | case ADD_NEW_DISK: | |
3345 | { | |
3346 | mdu_disk_info_t info; | |
3347 | if (copy_from_user(&info, argp, sizeof(info))) | |
3348 | err = -EFAULT; | |
3349 | else | |
3350 | err = add_new_disk(mddev, &info); | |
3351 | goto done_unlock; | |
3352 | } | |
3353 | ||
3354 | case HOT_REMOVE_DISK: | |
3355 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3356 | goto done_unlock; | |
3357 | ||
3358 | case HOT_ADD_DISK: | |
3359 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3360 | goto done_unlock; | |
3361 | ||
3362 | case SET_DISK_FAULTY: | |
3363 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3364 | goto done_unlock; | |
3365 | ||
3366 | case RUN_ARRAY: | |
3367 | err = do_md_run (mddev); | |
3368 | goto done_unlock; | |
3369 | ||
32a7627c N |
3370 | case SET_BITMAP_FILE: |
3371 | err = set_bitmap_file(mddev, (int)arg); | |
3372 | goto done_unlock; | |
3373 | ||
1da177e4 LT |
3374 | default: |
3375 | if (_IOC_TYPE(cmd) == MD_MAJOR) | |
3376 | printk(KERN_WARNING "md: %s(pid %d) used" | |
3377 | " obsolete MD ioctl, upgrade your" | |
3378 | " software to use new ictls.\n", | |
3379 | current->comm, current->pid); | |
3380 | err = -EINVAL; | |
3381 | goto abort_unlock; | |
3382 | } | |
3383 | ||
3384 | done_unlock: | |
3385 | abort_unlock: | |
3386 | mddev_unlock(mddev); | |
3387 | ||
3388 | return err; | |
3389 | done: | |
3390 | if (err) | |
3391 | MD_BUG(); | |
3392 | abort: | |
3393 | return err; | |
3394 | } | |
3395 | ||
3396 | static int md_open(struct inode *inode, struct file *file) | |
3397 | { | |
3398 | /* | |
3399 | * Succeed if we can lock the mddev, which confirms that | |
3400 | * it isn't being stopped right now. | |
3401 | */ | |
3402 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3403 | int err; | |
3404 | ||
3405 | if ((err = mddev_lock(mddev))) | |
3406 | goto out; | |
3407 | ||
3408 | err = 0; | |
3409 | mddev_get(mddev); | |
3410 | mddev_unlock(mddev); | |
3411 | ||
3412 | check_disk_change(inode->i_bdev); | |
3413 | out: | |
3414 | return err; | |
3415 | } | |
3416 | ||
3417 | static int md_release(struct inode *inode, struct file * file) | |
3418 | { | |
3419 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3420 | ||
3421 | if (!mddev) | |
3422 | BUG(); | |
3423 | mddev_put(mddev); | |
3424 | ||
3425 | return 0; | |
3426 | } | |
3427 | ||
3428 | static int md_media_changed(struct gendisk *disk) | |
3429 | { | |
3430 | mddev_t *mddev = disk->private_data; | |
3431 | ||
3432 | return mddev->changed; | |
3433 | } | |
3434 | ||
3435 | static int md_revalidate(struct gendisk *disk) | |
3436 | { | |
3437 | mddev_t *mddev = disk->private_data; | |
3438 | ||
3439 | mddev->changed = 0; | |
3440 | return 0; | |
3441 | } | |
3442 | static struct block_device_operations md_fops = | |
3443 | { | |
3444 | .owner = THIS_MODULE, | |
3445 | .open = md_open, | |
3446 | .release = md_release, | |
3447 | .ioctl = md_ioctl, | |
3448 | .media_changed = md_media_changed, | |
3449 | .revalidate_disk= md_revalidate, | |
3450 | }; | |
3451 | ||
75c96f85 | 3452 | static int md_thread(void * arg) |
1da177e4 LT |
3453 | { |
3454 | mdk_thread_t *thread = arg; | |
3455 | ||
1da177e4 LT |
3456 | /* |
3457 | * md_thread is a 'system-thread', it's priority should be very | |
3458 | * high. We avoid resource deadlocks individually in each | |
3459 | * raid personality. (RAID5 does preallocation) We also use RR and | |
3460 | * the very same RT priority as kswapd, thus we will never get | |
3461 | * into a priority inversion deadlock. | |
3462 | * | |
3463 | * we definitely have to have equal or higher priority than | |
3464 | * bdflush, otherwise bdflush will deadlock if there are too | |
3465 | * many dirty RAID5 blocks. | |
3466 | */ | |
1da177e4 | 3467 | |
6985c43f | 3468 | allow_signal(SIGKILL); |
a6fb0934 | 3469 | while (!kthread_should_stop()) { |
1da177e4 | 3470 | |
93588e22 N |
3471 | /* We need to wait INTERRUPTIBLE so that |
3472 | * we don't add to the load-average. | |
3473 | * That means we need to be sure no signals are | |
3474 | * pending | |
3475 | */ | |
3476 | if (signal_pending(current)) | |
3477 | flush_signals(current); | |
3478 | ||
3479 | wait_event_interruptible_timeout | |
3480 | (thread->wqueue, | |
3481 | test_bit(THREAD_WAKEUP, &thread->flags) | |
3482 | || kthread_should_stop(), | |
3483 | thread->timeout); | |
3e1d1d28 | 3484 | try_to_freeze(); |
1da177e4 LT |
3485 | |
3486 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
3487 | ||
787453c2 | 3488 | thread->run(thread->mddev); |
1da177e4 | 3489 | } |
a6fb0934 | 3490 | |
1da177e4 LT |
3491 | return 0; |
3492 | } | |
3493 | ||
3494 | void md_wakeup_thread(mdk_thread_t *thread) | |
3495 | { | |
3496 | if (thread) { | |
3497 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
3498 | set_bit(THREAD_WAKEUP, &thread->flags); | |
3499 | wake_up(&thread->wqueue); | |
3500 | } | |
3501 | } | |
3502 | ||
3503 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
3504 | const char *name) | |
3505 | { | |
3506 | mdk_thread_t *thread; | |
1da177e4 | 3507 | |
a6fb0934 | 3508 | thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
3509 | if (!thread) |
3510 | return NULL; | |
3511 | ||
3512 | memset(thread, 0, sizeof(mdk_thread_t)); | |
3513 | init_waitqueue_head(&thread->wqueue); | |
3514 | ||
1da177e4 LT |
3515 | thread->run = run; |
3516 | thread->mddev = mddev; | |
32a7627c | 3517 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 3518 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 3519 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
3520 | kfree(thread); |
3521 | return NULL; | |
3522 | } | |
1da177e4 LT |
3523 | return thread; |
3524 | } | |
3525 | ||
1da177e4 LT |
3526 | void md_unregister_thread(mdk_thread_t *thread) |
3527 | { | |
d28446fe | 3528 | dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); |
a6fb0934 N |
3529 | |
3530 | kthread_stop(thread->tsk); | |
1da177e4 LT |
3531 | kfree(thread); |
3532 | } | |
3533 | ||
3534 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
3535 | { | |
3536 | if (!mddev) { | |
3537 | MD_BUG(); | |
3538 | return; | |
3539 | } | |
3540 | ||
b2d444d7 | 3541 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3542 | return; |
32a7627c | 3543 | /* |
1da177e4 LT |
3544 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
3545 | mdname(mddev), | |
3546 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
3547 | __builtin_return_address(0),__builtin_return_address(1), | |
3548 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 3549 | */ |
1da177e4 LT |
3550 | if (!mddev->pers->error_handler) |
3551 | return; | |
3552 | mddev->pers->error_handler(mddev,rdev); | |
3553 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3554 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3555 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 3556 | md_new_event(mddev); |
1da177e4 LT |
3557 | } |
3558 | ||
3559 | /* seq_file implementation /proc/mdstat */ | |
3560 | ||
3561 | static void status_unused(struct seq_file *seq) | |
3562 | { | |
3563 | int i = 0; | |
3564 | mdk_rdev_t *rdev; | |
3565 | struct list_head *tmp; | |
3566 | ||
3567 | seq_printf(seq, "unused devices: "); | |
3568 | ||
3569 | ITERATE_RDEV_PENDING(rdev,tmp) { | |
3570 | char b[BDEVNAME_SIZE]; | |
3571 | i++; | |
3572 | seq_printf(seq, "%s ", | |
3573 | bdevname(rdev->bdev,b)); | |
3574 | } | |
3575 | if (!i) | |
3576 | seq_printf(seq, "<none>"); | |
3577 | ||
3578 | seq_printf(seq, "\n"); | |
3579 | } | |
3580 | ||
3581 | ||
3582 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
3583 | { | |
3584 | unsigned long max_blocks, resync, res, dt, db, rt; | |
3585 | ||
3586 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
3587 | ||
3588 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3589 | max_blocks = mddev->resync_max_sectors >> 1; | |
3590 | else | |
3591 | max_blocks = mddev->size; | |
3592 | ||
3593 | /* | |
3594 | * Should not happen. | |
3595 | */ | |
3596 | if (!max_blocks) { | |
3597 | MD_BUG(); | |
3598 | return; | |
3599 | } | |
3600 | res = (resync/1024)*1000/(max_blocks/1024 + 1); | |
3601 | { | |
3602 | int i, x = res/50, y = 20-x; | |
3603 | seq_printf(seq, "["); | |
3604 | for (i = 0; i < x; i++) | |
3605 | seq_printf(seq, "="); | |
3606 | seq_printf(seq, ">"); | |
3607 | for (i = 0; i < y; i++) | |
3608 | seq_printf(seq, "."); | |
3609 | seq_printf(seq, "] "); | |
3610 | } | |
3611 | seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", | |
3612 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
3613 | "resync" : "recovery"), | |
3614 | res/10, res % 10, resync, max_blocks); | |
3615 | ||
3616 | /* | |
3617 | * We do not want to overflow, so the order of operands and | |
3618 | * the * 100 / 100 trick are important. We do a +1 to be | |
3619 | * safe against division by zero. We only estimate anyway. | |
3620 | * | |
3621 | * dt: time from mark until now | |
3622 | * db: blocks written from mark until now | |
3623 | * rt: remaining time | |
3624 | */ | |
3625 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
3626 | if (!dt) dt++; | |
3627 | db = resync - (mddev->resync_mark_cnt/2); | |
3628 | rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; | |
3629 | ||
3630 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
3631 | ||
3632 | seq_printf(seq, " speed=%ldK/sec", db/dt); | |
3633 | } | |
3634 | ||
3635 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
3636 | { | |
3637 | struct list_head *tmp; | |
3638 | loff_t l = *pos; | |
3639 | mddev_t *mddev; | |
3640 | ||
3641 | if (l >= 0x10000) | |
3642 | return NULL; | |
3643 | if (!l--) | |
3644 | /* header */ | |
3645 | return (void*)1; | |
3646 | ||
3647 | spin_lock(&all_mddevs_lock); | |
3648 | list_for_each(tmp,&all_mddevs) | |
3649 | if (!l--) { | |
3650 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
3651 | mddev_get(mddev); | |
3652 | spin_unlock(&all_mddevs_lock); | |
3653 | return mddev; | |
3654 | } | |
3655 | spin_unlock(&all_mddevs_lock); | |
3656 | if (!l--) | |
3657 | return (void*)2;/* tail */ | |
3658 | return NULL; | |
3659 | } | |
3660 | ||
3661 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3662 | { | |
3663 | struct list_head *tmp; | |
3664 | mddev_t *next_mddev, *mddev = v; | |
3665 | ||
3666 | ++*pos; | |
3667 | if (v == (void*)2) | |
3668 | return NULL; | |
3669 | ||
3670 | spin_lock(&all_mddevs_lock); | |
3671 | if (v == (void*)1) | |
3672 | tmp = all_mddevs.next; | |
3673 | else | |
3674 | tmp = mddev->all_mddevs.next; | |
3675 | if (tmp != &all_mddevs) | |
3676 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
3677 | else { | |
3678 | next_mddev = (void*)2; | |
3679 | *pos = 0x10000; | |
3680 | } | |
3681 | spin_unlock(&all_mddevs_lock); | |
3682 | ||
3683 | if (v != (void*)1) | |
3684 | mddev_put(mddev); | |
3685 | return next_mddev; | |
3686 | ||
3687 | } | |
3688 | ||
3689 | static void md_seq_stop(struct seq_file *seq, void *v) | |
3690 | { | |
3691 | mddev_t *mddev = v; | |
3692 | ||
3693 | if (mddev && v != (void*)1 && v != (void*)2) | |
3694 | mddev_put(mddev); | |
3695 | } | |
3696 | ||
d7603b7e N |
3697 | struct mdstat_info { |
3698 | int event; | |
3699 | }; | |
3700 | ||
1da177e4 LT |
3701 | static int md_seq_show(struct seq_file *seq, void *v) |
3702 | { | |
3703 | mddev_t *mddev = v; | |
3704 | sector_t size; | |
3705 | struct list_head *tmp2; | |
3706 | mdk_rdev_t *rdev; | |
d7603b7e | 3707 | struct mdstat_info *mi = seq->private; |
1da177e4 | 3708 | int i; |
32a7627c | 3709 | struct bitmap *bitmap; |
1da177e4 LT |
3710 | |
3711 | if (v == (void*)1) { | |
3712 | seq_printf(seq, "Personalities : "); | |
3713 | spin_lock(&pers_lock); | |
3714 | for (i = 0; i < MAX_PERSONALITY; i++) | |
3715 | if (pers[i]) | |
3716 | seq_printf(seq, "[%s] ", pers[i]->name); | |
3717 | ||
3718 | spin_unlock(&pers_lock); | |
3719 | seq_printf(seq, "\n"); | |
d7603b7e | 3720 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
3721 | return 0; |
3722 | } | |
3723 | if (v == (void*)2) { | |
3724 | status_unused(seq); | |
3725 | return 0; | |
3726 | } | |
3727 | ||
3728 | if (mddev_lock(mddev)!=0) | |
3729 | return -EINTR; | |
3730 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { | |
3731 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
3732 | mddev->pers ? "" : "in"); | |
3733 | if (mddev->pers) { | |
f91de92e | 3734 | if (mddev->ro==1) |
1da177e4 | 3735 | seq_printf(seq, " (read-only)"); |
f91de92e N |
3736 | if (mddev->ro==2) |
3737 | seq_printf(seq, "(auto-read-only)"); | |
1da177e4 LT |
3738 | seq_printf(seq, " %s", mddev->pers->name); |
3739 | } | |
3740 | ||
3741 | size = 0; | |
3742 | ITERATE_RDEV(mddev,rdev,tmp2) { | |
3743 | char b[BDEVNAME_SIZE]; | |
3744 | seq_printf(seq, " %s[%d]", | |
3745 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
3746 | if (test_bit(WriteMostly, &rdev->flags)) |
3747 | seq_printf(seq, "(W)"); | |
b2d444d7 | 3748 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
3749 | seq_printf(seq, "(F)"); |
3750 | continue; | |
b325a32e N |
3751 | } else if (rdev->raid_disk < 0) |
3752 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
3753 | size += rdev->size; |
3754 | } | |
3755 | ||
3756 | if (!list_empty(&mddev->disks)) { | |
3757 | if (mddev->pers) | |
3758 | seq_printf(seq, "\n %llu blocks", | |
3759 | (unsigned long long)mddev->array_size); | |
3760 | else | |
3761 | seq_printf(seq, "\n %llu blocks", | |
3762 | (unsigned long long)size); | |
3763 | } | |
1cd6bf19 N |
3764 | if (mddev->persistent) { |
3765 | if (mddev->major_version != 0 || | |
3766 | mddev->minor_version != 90) { | |
3767 | seq_printf(seq," super %d.%d", | |
3768 | mddev->major_version, | |
3769 | mddev->minor_version); | |
3770 | } | |
3771 | } else | |
3772 | seq_printf(seq, " super non-persistent"); | |
1da177e4 LT |
3773 | |
3774 | if (mddev->pers) { | |
3775 | mddev->pers->status (seq, mddev); | |
3776 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
3777 | if (mddev->pers->sync_request) { |
3778 | if (mddev->curr_resync > 2) { | |
3779 | status_resync (seq, mddev); | |
3780 | seq_printf(seq, "\n "); | |
3781 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
3782 | seq_printf(seq, "\tresync=DELAYED\n "); | |
3783 | else if (mddev->recovery_cp < MaxSector) | |
3784 | seq_printf(seq, "\tresync=PENDING\n "); | |
3785 | } | |
32a7627c N |
3786 | } else |
3787 | seq_printf(seq, "\n "); | |
3788 | ||
3789 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
3790 | unsigned long chunk_kb; |
3791 | unsigned long flags; | |
32a7627c N |
3792 | spin_lock_irqsave(&bitmap->lock, flags); |
3793 | chunk_kb = bitmap->chunksize >> 10; | |
3794 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
3795 | "%lu%s chunk", | |
3796 | bitmap->pages - bitmap->missing_pages, | |
3797 | bitmap->pages, | |
3798 | (bitmap->pages - bitmap->missing_pages) | |
3799 | << (PAGE_SHIFT - 10), | |
3800 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
3801 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
3802 | if (bitmap->file) { |
3803 | seq_printf(seq, ", file: "); | |
3804 | seq_path(seq, bitmap->file->f_vfsmnt, | |
3805 | bitmap->file->f_dentry," \t\n"); | |
32a7627c | 3806 | } |
78d742d8 | 3807 | |
32a7627c N |
3808 | seq_printf(seq, "\n"); |
3809 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
3810 | } |
3811 | ||
3812 | seq_printf(seq, "\n"); | |
3813 | } | |
3814 | mddev_unlock(mddev); | |
3815 | ||
3816 | return 0; | |
3817 | } | |
3818 | ||
3819 | static struct seq_operations md_seq_ops = { | |
3820 | .start = md_seq_start, | |
3821 | .next = md_seq_next, | |
3822 | .stop = md_seq_stop, | |
3823 | .show = md_seq_show, | |
3824 | }; | |
3825 | ||
3826 | static int md_seq_open(struct inode *inode, struct file *file) | |
3827 | { | |
3828 | int error; | |
d7603b7e N |
3829 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
3830 | if (mi == NULL) | |
3831 | return -ENOMEM; | |
1da177e4 LT |
3832 | |
3833 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
3834 | if (error) |
3835 | kfree(mi); | |
3836 | else { | |
3837 | struct seq_file *p = file->private_data; | |
3838 | p->private = mi; | |
3839 | mi->event = atomic_read(&md_event_count); | |
3840 | } | |
1da177e4 LT |
3841 | return error; |
3842 | } | |
3843 | ||
d7603b7e N |
3844 | static int md_seq_release(struct inode *inode, struct file *file) |
3845 | { | |
3846 | struct seq_file *m = file->private_data; | |
3847 | struct mdstat_info *mi = m->private; | |
3848 | m->private = NULL; | |
3849 | kfree(mi); | |
3850 | return seq_release(inode, file); | |
3851 | } | |
3852 | ||
3853 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) | |
3854 | { | |
3855 | struct seq_file *m = filp->private_data; | |
3856 | struct mdstat_info *mi = m->private; | |
3857 | int mask; | |
3858 | ||
3859 | poll_wait(filp, &md_event_waiters, wait); | |
3860 | ||
3861 | /* always allow read */ | |
3862 | mask = POLLIN | POLLRDNORM; | |
3863 | ||
3864 | if (mi->event != atomic_read(&md_event_count)) | |
3865 | mask |= POLLERR | POLLPRI; | |
3866 | return mask; | |
3867 | } | |
3868 | ||
1da177e4 LT |
3869 | static struct file_operations md_seq_fops = { |
3870 | .open = md_seq_open, | |
3871 | .read = seq_read, | |
3872 | .llseek = seq_lseek, | |
d7603b7e N |
3873 | .release = md_seq_release, |
3874 | .poll = mdstat_poll, | |
1da177e4 LT |
3875 | }; |
3876 | ||
3877 | int register_md_personality(int pnum, mdk_personality_t *p) | |
3878 | { | |
3879 | if (pnum >= MAX_PERSONALITY) { | |
3880 | printk(KERN_ERR | |
3881 | "md: tried to install personality %s as nr %d, but max is %lu\n", | |
3882 | p->name, pnum, MAX_PERSONALITY-1); | |
3883 | return -EINVAL; | |
3884 | } | |
3885 | ||
3886 | spin_lock(&pers_lock); | |
3887 | if (pers[pnum]) { | |
3888 | spin_unlock(&pers_lock); | |
1da177e4 LT |
3889 | return -EBUSY; |
3890 | } | |
3891 | ||
3892 | pers[pnum] = p; | |
3893 | printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum); | |
3894 | spin_unlock(&pers_lock); | |
3895 | return 0; | |
3896 | } | |
3897 | ||
3898 | int unregister_md_personality(int pnum) | |
3899 | { | |
a757e64c | 3900 | if (pnum >= MAX_PERSONALITY) |
1da177e4 | 3901 | return -EINVAL; |
1da177e4 LT |
3902 | |
3903 | printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name); | |
3904 | spin_lock(&pers_lock); | |
3905 | pers[pnum] = NULL; | |
3906 | spin_unlock(&pers_lock); | |
3907 | return 0; | |
3908 | } | |
3909 | ||
3910 | static int is_mddev_idle(mddev_t *mddev) | |
3911 | { | |
3912 | mdk_rdev_t * rdev; | |
3913 | struct list_head *tmp; | |
3914 | int idle; | |
3915 | unsigned long curr_events; | |
3916 | ||
3917 | idle = 1; | |
3918 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3919 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
a362357b JA |
3920 | curr_events = disk_stat_read(disk, sectors[0]) + |
3921 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 3922 | atomic_read(&disk->sync_io); |
c0e48521 N |
3923 | /* The difference between curr_events and last_events |
3924 | * will be affected by any new non-sync IO (making | |
3925 | * curr_events bigger) and any difference in the amount of | |
3926 | * in-flight syncio (making current_events bigger or smaller) | |
3927 | * The amount in-flight is currently limited to | |
3928 | * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6 | |
3929 | * which is at most 4096 sectors. | |
3930 | * These numbers are fairly fragile and should be made | |
3931 | * more robust, probably by enforcing the | |
3932 | * 'window size' that md_do_sync sort-of uses. | |
3933 | * | |
1da177e4 LT |
3934 | * Note: the following is an unsigned comparison. |
3935 | */ | |
c0e48521 | 3936 | if ((curr_events - rdev->last_events + 4096) > 8192) { |
1da177e4 LT |
3937 | rdev->last_events = curr_events; |
3938 | idle = 0; | |
3939 | } | |
3940 | } | |
3941 | return idle; | |
3942 | } | |
3943 | ||
3944 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
3945 | { | |
3946 | /* another "blocks" (512byte) blocks have been synced */ | |
3947 | atomic_sub(blocks, &mddev->recovery_active); | |
3948 | wake_up(&mddev->recovery_wait); | |
3949 | if (!ok) { | |
3950 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
3951 | md_wakeup_thread(mddev->thread); | |
3952 | // stop recovery, signal do_sync .... | |
3953 | } | |
3954 | } | |
3955 | ||
3956 | ||
06d91a5f N |
3957 | /* md_write_start(mddev, bi) |
3958 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
3959 | * in superblock) before writing, schedule a superblock update |
3960 | * and wait for it to complete. | |
06d91a5f | 3961 | */ |
3d310eb7 | 3962 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 3963 | { |
06d91a5f | 3964 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 3965 | return; |
06d91a5f | 3966 | |
f91de92e N |
3967 | BUG_ON(mddev->ro == 1); |
3968 | if (mddev->ro == 2) { | |
3969 | /* need to switch to read/write */ | |
3970 | mddev->ro = 0; | |
3971 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3972 | md_wakeup_thread(mddev->thread); | |
3973 | } | |
06d91a5f | 3974 | atomic_inc(&mddev->writes_pending); |
06d91a5f | 3975 | if (mddev->in_sync) { |
a9701a30 | 3976 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
3977 | if (mddev->in_sync) { |
3978 | mddev->in_sync = 0; | |
3979 | mddev->sb_dirty = 1; | |
3980 | md_wakeup_thread(mddev->thread); | |
3981 | } | |
a9701a30 | 3982 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 3983 | } |
3d310eb7 | 3984 | wait_event(mddev->sb_wait, mddev->sb_dirty==0); |
1da177e4 LT |
3985 | } |
3986 | ||
3987 | void md_write_end(mddev_t *mddev) | |
3988 | { | |
3989 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
3990 | if (mddev->safemode == 2) | |
3991 | md_wakeup_thread(mddev->thread); | |
3992 | else | |
3993 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); | |
3994 | } | |
3995 | } | |
3996 | ||
75c96f85 | 3997 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
3998 | |
3999 | #define SYNC_MARKS 10 | |
4000 | #define SYNC_MARK_STEP (3*HZ) | |
4001 | static void md_do_sync(mddev_t *mddev) | |
4002 | { | |
4003 | mddev_t *mddev2; | |
4004 | unsigned int currspeed = 0, | |
4005 | window; | |
57afd89f | 4006 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
4007 | unsigned long mark[SYNC_MARKS]; |
4008 | sector_t mark_cnt[SYNC_MARKS]; | |
4009 | int last_mark,m; | |
4010 | struct list_head *tmp; | |
4011 | sector_t last_check; | |
57afd89f | 4012 | int skipped = 0; |
1da177e4 LT |
4013 | |
4014 | /* just incase thread restarts... */ | |
4015 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
4016 | return; | |
4017 | ||
4018 | /* we overload curr_resync somewhat here. | |
4019 | * 0 == not engaged in resync at all | |
4020 | * 2 == checking that there is no conflict with another sync | |
4021 | * 1 == like 2, but have yielded to allow conflicting resync to | |
4022 | * commense | |
4023 | * other == active in resync - this many blocks | |
4024 | * | |
4025 | * Before starting a resync we must have set curr_resync to | |
4026 | * 2, and then checked that every "conflicting" array has curr_resync | |
4027 | * less than ours. When we find one that is the same or higher | |
4028 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
4029 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
4030 | * This will mean we have to start checking from the beginning again. | |
4031 | * | |
4032 | */ | |
4033 | ||
4034 | do { | |
4035 | mddev->curr_resync = 2; | |
4036 | ||
4037 | try_again: | |
787453c2 | 4038 | if (kthread_should_stop()) { |
6985c43f | 4039 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
4040 | goto skip; |
4041 | } | |
4042 | ITERATE_MDDEV(mddev2,tmp) { | |
1da177e4 LT |
4043 | if (mddev2 == mddev) |
4044 | continue; | |
4045 | if (mddev2->curr_resync && | |
4046 | match_mddev_units(mddev,mddev2)) { | |
4047 | DEFINE_WAIT(wq); | |
4048 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
4049 | /* arbitrarily yield */ | |
4050 | mddev->curr_resync = 1; | |
4051 | wake_up(&resync_wait); | |
4052 | } | |
4053 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
4054 | /* no need to wait here, we can wait the next | |
4055 | * time 'round when curr_resync == 2 | |
4056 | */ | |
4057 | continue; | |
787453c2 N |
4058 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
4059 | if (!kthread_should_stop() && | |
8712e553 | 4060 | mddev2->curr_resync >= mddev->curr_resync) { |
1da177e4 LT |
4061 | printk(KERN_INFO "md: delaying resync of %s" |
4062 | " until %s has finished resync (they" | |
4063 | " share one or more physical units)\n", | |
4064 | mdname(mddev), mdname(mddev2)); | |
4065 | mddev_put(mddev2); | |
4066 | schedule(); | |
4067 | finish_wait(&resync_wait, &wq); | |
4068 | goto try_again; | |
4069 | } | |
4070 | finish_wait(&resync_wait, &wq); | |
4071 | } | |
4072 | } | |
4073 | } while (mddev->curr_resync < 2); | |
4074 | ||
9d88883e | 4075 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 4076 | /* resync follows the size requested by the personality, |
57afd89f | 4077 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
4078 | */ |
4079 | max_sectors = mddev->resync_max_sectors; | |
9d88883e N |
4080 | mddev->resync_mismatches = 0; |
4081 | } else | |
1da177e4 LT |
4082 | /* recovery follows the physical size of devices */ |
4083 | max_sectors = mddev->size << 1; | |
4084 | ||
4085 | printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); | |
4086 | printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" | |
4087 | " %d KB/sec/disc.\n", sysctl_speed_limit_min); | |
338cec32 | 4088 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
1da177e4 LT |
4089 | "(but not more than %d KB/sec) for reconstruction.\n", |
4090 | sysctl_speed_limit_max); | |
4091 | ||
4092 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
32a7627c | 4093 | /* we don't use the checkpoint if there's a bitmap */ |
24dd469d N |
4094 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap |
4095 | && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1da177e4 LT |
4096 | j = mddev->recovery_cp; |
4097 | else | |
4098 | j = 0; | |
57afd89f | 4099 | io_sectors = 0; |
1da177e4 LT |
4100 | for (m = 0; m < SYNC_MARKS; m++) { |
4101 | mark[m] = jiffies; | |
57afd89f | 4102 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
4103 | } |
4104 | last_mark = 0; | |
4105 | mddev->resync_mark = mark[last_mark]; | |
4106 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
4107 | ||
4108 | /* | |
4109 | * Tune reconstruction: | |
4110 | */ | |
4111 | window = 32*(PAGE_SIZE/512); | |
4112 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
4113 | window/2,(unsigned long long) max_sectors/2); | |
4114 | ||
4115 | atomic_set(&mddev->recovery_active, 0); | |
4116 | init_waitqueue_head(&mddev->recovery_wait); | |
4117 | last_check = 0; | |
4118 | ||
4119 | if (j>2) { | |
4120 | printk(KERN_INFO | |
4121 | "md: resuming recovery of %s from checkpoint.\n", | |
4122 | mdname(mddev)); | |
4123 | mddev->curr_resync = j; | |
4124 | } | |
4125 | ||
4126 | while (j < max_sectors) { | |
57afd89f | 4127 | sector_t sectors; |
1da177e4 | 4128 | |
57afd89f N |
4129 | skipped = 0; |
4130 | sectors = mddev->pers->sync_request(mddev, j, &skipped, | |
4131 | currspeed < sysctl_speed_limit_min); | |
4132 | if (sectors == 0) { | |
1da177e4 LT |
4133 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
4134 | goto out; | |
4135 | } | |
57afd89f N |
4136 | |
4137 | if (!skipped) { /* actual IO requested */ | |
4138 | io_sectors += sectors; | |
4139 | atomic_add(sectors, &mddev->recovery_active); | |
4140 | } | |
4141 | ||
1da177e4 LT |
4142 | j += sectors; |
4143 | if (j>1) mddev->curr_resync = j; | |
d7603b7e N |
4144 | if (last_check == 0) |
4145 | /* this is the earliers that rebuilt will be | |
4146 | * visible in /proc/mdstat | |
4147 | */ | |
4148 | md_new_event(mddev); | |
57afd89f N |
4149 | |
4150 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
4151 | continue; |
4152 | ||
57afd89f | 4153 | last_check = io_sectors; |
1da177e4 LT |
4154 | |
4155 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
4156 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
4157 | break; | |
4158 | ||
4159 | repeat: | |
4160 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
4161 | /* step marks */ | |
4162 | int next = (last_mark+1) % SYNC_MARKS; | |
4163 | ||
4164 | mddev->resync_mark = mark[next]; | |
4165 | mddev->resync_mark_cnt = mark_cnt[next]; | |
4166 | mark[next] = jiffies; | |
57afd89f | 4167 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
4168 | last_mark = next; |
4169 | } | |
4170 | ||
4171 | ||
787453c2 | 4172 | if (kthread_should_stop()) { |
1da177e4 LT |
4173 | /* |
4174 | * got a signal, exit. | |
4175 | */ | |
4176 | printk(KERN_INFO | |
4177 | "md: md_do_sync() got signal ... exiting\n"); | |
1da177e4 LT |
4178 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4179 | goto out; | |
4180 | } | |
4181 | ||
4182 | /* | |
4183 | * this loop exits only if either when we are slower than | |
4184 | * the 'hard' speed limit, or the system was IO-idle for | |
4185 | * a jiffy. | |
4186 | * the system might be non-idle CPU-wise, but we only care | |
4187 | * about not overloading the IO subsystem. (things like an | |
4188 | * e2fsck being done on the RAID array should execute fast) | |
4189 | */ | |
4190 | mddev->queue->unplug_fn(mddev->queue); | |
4191 | cond_resched(); | |
4192 | ||
57afd89f N |
4193 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
4194 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 LT |
4195 | |
4196 | if (currspeed > sysctl_speed_limit_min) { | |
4197 | if ((currspeed > sysctl_speed_limit_max) || | |
4198 | !is_mddev_idle(mddev)) { | |
c0e48521 | 4199 | msleep(500); |
1da177e4 LT |
4200 | goto repeat; |
4201 | } | |
4202 | } | |
4203 | } | |
4204 | printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); | |
4205 | /* | |
4206 | * this also signals 'finished resyncing' to md_stop | |
4207 | */ | |
4208 | out: | |
4209 | mddev->queue->unplug_fn(mddev->queue); | |
4210 | ||
4211 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
4212 | ||
4213 | /* tell personality that we are finished */ | |
57afd89f | 4214 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
4215 | |
4216 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4217 | mddev->curr_resync > 2 && | |
4218 | mddev->curr_resync >= mddev->recovery_cp) { | |
4219 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4220 | printk(KERN_INFO | |
4221 | "md: checkpointing recovery of %s.\n", | |
4222 | mdname(mddev)); | |
4223 | mddev->recovery_cp = mddev->curr_resync; | |
4224 | } else | |
4225 | mddev->recovery_cp = MaxSector; | |
4226 | } | |
4227 | ||
1da177e4 LT |
4228 | skip: |
4229 | mddev->curr_resync = 0; | |
4230 | wake_up(&resync_wait); | |
4231 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
4232 | md_wakeup_thread(mddev->thread); | |
4233 | } | |
4234 | ||
4235 | ||
4236 | /* | |
4237 | * This routine is regularly called by all per-raid-array threads to | |
4238 | * deal with generic issues like resync and super-block update. | |
4239 | * Raid personalities that don't have a thread (linear/raid0) do not | |
4240 | * need this as they never do any recovery or update the superblock. | |
4241 | * | |
4242 | * It does not do any resync itself, but rather "forks" off other threads | |
4243 | * to do that as needed. | |
4244 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
4245 | * "->recovery" and create a thread at ->sync_thread. | |
4246 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
4247 | * and wakeups up this thread which will reap the thread and finish up. | |
4248 | * This thread also removes any faulty devices (with nr_pending == 0). | |
4249 | * | |
4250 | * The overall approach is: | |
4251 | * 1/ if the superblock needs updating, update it. | |
4252 | * 2/ If a recovery thread is running, don't do anything else. | |
4253 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
4254 | * 4/ If there are any faulty devices, remove them. | |
4255 | * 5/ If array is degraded, try to add spares devices | |
4256 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
4257 | */ | |
4258 | void md_check_recovery(mddev_t *mddev) | |
4259 | { | |
4260 | mdk_rdev_t *rdev; | |
4261 | struct list_head *rtmp; | |
4262 | ||
4263 | ||
5f40402d N |
4264 | if (mddev->bitmap) |
4265 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
4266 | |
4267 | if (mddev->ro) | |
4268 | return; | |
fca4d848 N |
4269 | |
4270 | if (signal_pending(current)) { | |
4271 | if (mddev->pers->sync_request) { | |
4272 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
4273 | mdname(mddev)); | |
4274 | mddev->safemode = 2; | |
4275 | } | |
4276 | flush_signals(current); | |
4277 | } | |
4278 | ||
1da177e4 LT |
4279 | if ( ! ( |
4280 | mddev->sb_dirty || | |
4281 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || | |
fca4d848 N |
4282 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
4283 | (mddev->safemode == 1) || | |
4284 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
4285 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
4286 | )) |
4287 | return; | |
fca4d848 | 4288 | |
1da177e4 LT |
4289 | if (mddev_trylock(mddev)==0) { |
4290 | int spares =0; | |
fca4d848 | 4291 | |
a9701a30 | 4292 | spin_lock_irq(&mddev->write_lock); |
fca4d848 N |
4293 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
4294 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
4295 | mddev->in_sync = 1; | |
4296 | mddev->sb_dirty = 1; | |
4297 | } | |
4298 | if (mddev->safemode == 1) | |
4299 | mddev->safemode = 0; | |
a9701a30 | 4300 | spin_unlock_irq(&mddev->write_lock); |
fca4d848 | 4301 | |
1da177e4 LT |
4302 | if (mddev->sb_dirty) |
4303 | md_update_sb(mddev); | |
06d91a5f | 4304 | |
06d91a5f | 4305 | |
1da177e4 LT |
4306 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4307 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
4308 | /* resync/recovery still happening */ | |
4309 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4310 | goto unlock; | |
4311 | } | |
4312 | if (mddev->sync_thread) { | |
4313 | /* resync has finished, collect result */ | |
4314 | md_unregister_thread(mddev->sync_thread); | |
4315 | mddev->sync_thread = NULL; | |
4316 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4317 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4318 | /* success...*/ | |
4319 | /* activate any spares */ | |
4320 | mddev->pers->spare_active(mddev); | |
4321 | } | |
4322 | md_update_sb(mddev); | |
41158c7e N |
4323 | |
4324 | /* if array is no-longer degraded, then any saved_raid_disk | |
4325 | * information must be scrapped | |
4326 | */ | |
4327 | if (!mddev->degraded) | |
4328 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4329 | rdev->saved_raid_disk = -1; | |
4330 | ||
1da177e4 LT |
4331 | mddev->recovery = 0; |
4332 | /* flag recovery needed just to double check */ | |
4333 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
d7603b7e | 4334 | md_new_event(mddev); |
1da177e4 LT |
4335 | goto unlock; |
4336 | } | |
24dd469d N |
4337 | /* Clear some bits that don't mean anything, but |
4338 | * might be left set | |
4339 | */ | |
4340 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4341 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
4342 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4343 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 LT |
4344 | |
4345 | /* no recovery is running. | |
4346 | * remove any failed drives, then | |
4347 | * add spares if possible. | |
4348 | * Spare are also removed and re-added, to allow | |
4349 | * the personality to fail the re-add. | |
4350 | */ | |
4351 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4352 | if (rdev->raid_disk >= 0 && | |
b2d444d7 | 4353 | (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && |
1da177e4 | 4354 | atomic_read(&rdev->nr_pending)==0) { |
86e6ffdd N |
4355 | if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { |
4356 | char nm[20]; | |
4357 | sprintf(nm,"rd%d", rdev->raid_disk); | |
4358 | sysfs_remove_link(&mddev->kobj, nm); | |
1da177e4 | 4359 | rdev->raid_disk = -1; |
86e6ffdd | 4360 | } |
1da177e4 LT |
4361 | } |
4362 | ||
4363 | if (mddev->degraded) { | |
4364 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4365 | if (rdev->raid_disk < 0 | |
b2d444d7 | 4366 | && !test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
4367 | if (mddev->pers->hot_add_disk(mddev,rdev)) { |
4368 | char nm[20]; | |
4369 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4370 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
1da177e4 | 4371 | spares++; |
d7603b7e | 4372 | md_new_event(mddev); |
86e6ffdd | 4373 | } else |
1da177e4 LT |
4374 | break; |
4375 | } | |
4376 | } | |
4377 | ||
24dd469d N |
4378 | if (spares) { |
4379 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4380 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4381 | } else if (mddev->recovery_cp < MaxSector) { | |
4382 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4383 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4384 | /* nothing to be done ... */ | |
1da177e4 | 4385 | goto unlock; |
24dd469d | 4386 | |
1da177e4 LT |
4387 | if (mddev->pers->sync_request) { |
4388 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
4389 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
4390 | /* We are adding a device or devices to an array | |
4391 | * which has the bitmap stored on all devices. | |
4392 | * So make sure all bitmap pages get written | |
4393 | */ | |
4394 | bitmap_write_all(mddev->bitmap); | |
4395 | } | |
1da177e4 LT |
4396 | mddev->sync_thread = md_register_thread(md_do_sync, |
4397 | mddev, | |
4398 | "%s_resync"); | |
4399 | if (!mddev->sync_thread) { | |
4400 | printk(KERN_ERR "%s: could not start resync" | |
4401 | " thread...\n", | |
4402 | mdname(mddev)); | |
4403 | /* leave the spares where they are, it shouldn't hurt */ | |
4404 | mddev->recovery = 0; | |
d7603b7e | 4405 | } else |
1da177e4 | 4406 | md_wakeup_thread(mddev->sync_thread); |
d7603b7e | 4407 | md_new_event(mddev); |
1da177e4 LT |
4408 | } |
4409 | unlock: | |
4410 | mddev_unlock(mddev); | |
4411 | } | |
4412 | } | |
4413 | ||
75c96f85 AB |
4414 | static int md_notify_reboot(struct notifier_block *this, |
4415 | unsigned long code, void *x) | |
1da177e4 LT |
4416 | { |
4417 | struct list_head *tmp; | |
4418 | mddev_t *mddev; | |
4419 | ||
4420 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
4421 | ||
4422 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
4423 | ||
4424 | ITERATE_MDDEV(mddev,tmp) | |
4425 | if (mddev_trylock(mddev)==0) | |
4426 | do_md_stop (mddev, 1); | |
4427 | /* | |
4428 | * certain more exotic SCSI devices are known to be | |
4429 | * volatile wrt too early system reboots. While the | |
4430 | * right place to handle this issue is the given | |
4431 | * driver, we do want to have a safe RAID driver ... | |
4432 | */ | |
4433 | mdelay(1000*1); | |
4434 | } | |
4435 | return NOTIFY_DONE; | |
4436 | } | |
4437 | ||
75c96f85 | 4438 | static struct notifier_block md_notifier = { |
1da177e4 LT |
4439 | .notifier_call = md_notify_reboot, |
4440 | .next = NULL, | |
4441 | .priority = INT_MAX, /* before any real devices */ | |
4442 | }; | |
4443 | ||
4444 | static void md_geninit(void) | |
4445 | { | |
4446 | struct proc_dir_entry *p; | |
4447 | ||
4448 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
4449 | ||
4450 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
4451 | if (p) | |
4452 | p->proc_fops = &md_seq_fops; | |
4453 | } | |
4454 | ||
75c96f85 | 4455 | static int __init md_init(void) |
1da177e4 LT |
4456 | { |
4457 | int minor; | |
4458 | ||
4459 | printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," | |
4460 | " MD_SB_DISKS=%d\n", | |
4461 | MD_MAJOR_VERSION, MD_MINOR_VERSION, | |
4462 | MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); | |
bd926c63 | 4463 | printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, |
32a7627c | 4464 | BITMAP_MINOR); |
1da177e4 LT |
4465 | |
4466 | if (register_blkdev(MAJOR_NR, "md")) | |
4467 | return -1; | |
4468 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
4469 | unregister_blkdev(MAJOR_NR, "md"); | |
4470 | return -1; | |
4471 | } | |
4472 | devfs_mk_dir("md"); | |
4473 | blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, | |
4474 | md_probe, NULL, NULL); | |
4475 | blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, | |
4476 | md_probe, NULL, NULL); | |
4477 | ||
4478 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4479 | devfs_mk_bdev(MKDEV(MAJOR_NR, minor), | |
4480 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4481 | "md/%d", minor); | |
4482 | ||
4483 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4484 | devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), | |
4485 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4486 | "md/mdp%d", minor); | |
4487 | ||
4488 | ||
4489 | register_reboot_notifier(&md_notifier); | |
4490 | raid_table_header = register_sysctl_table(raid_root_table, 1); | |
4491 | ||
4492 | md_geninit(); | |
4493 | return (0); | |
4494 | } | |
4495 | ||
4496 | ||
4497 | #ifndef MODULE | |
4498 | ||
4499 | /* | |
4500 | * Searches all registered partitions for autorun RAID arrays | |
4501 | * at boot time. | |
4502 | */ | |
4503 | static dev_t detected_devices[128]; | |
4504 | static int dev_cnt; | |
4505 | ||
4506 | void md_autodetect_dev(dev_t dev) | |
4507 | { | |
4508 | if (dev_cnt >= 0 && dev_cnt < 127) | |
4509 | detected_devices[dev_cnt++] = dev; | |
4510 | } | |
4511 | ||
4512 | ||
4513 | static void autostart_arrays(int part) | |
4514 | { | |
4515 | mdk_rdev_t *rdev; | |
4516 | int i; | |
4517 | ||
4518 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); | |
4519 | ||
4520 | for (i = 0; i < dev_cnt; i++) { | |
4521 | dev_t dev = detected_devices[i]; | |
4522 | ||
4523 | rdev = md_import_device(dev,0, 0); | |
4524 | if (IS_ERR(rdev)) | |
4525 | continue; | |
4526 | ||
b2d444d7 | 4527 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4528 | MD_BUG(); |
4529 | continue; | |
4530 | } | |
4531 | list_add(&rdev->same_set, &pending_raid_disks); | |
4532 | } | |
4533 | dev_cnt = 0; | |
4534 | ||
4535 | autorun_devices(part); | |
4536 | } | |
4537 | ||
4538 | #endif | |
4539 | ||
4540 | static __exit void md_exit(void) | |
4541 | { | |
4542 | mddev_t *mddev; | |
4543 | struct list_head *tmp; | |
4544 | int i; | |
4545 | blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); | |
4546 | blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); | |
4547 | for (i=0; i < MAX_MD_DEVS; i++) | |
4548 | devfs_remove("md/%d", i); | |
4549 | for (i=0; i < MAX_MD_DEVS; i++) | |
4550 | devfs_remove("md/d%d", i); | |
4551 | ||
4552 | devfs_remove("md"); | |
4553 | ||
4554 | unregister_blkdev(MAJOR_NR,"md"); | |
4555 | unregister_blkdev(mdp_major, "mdp"); | |
4556 | unregister_reboot_notifier(&md_notifier); | |
4557 | unregister_sysctl_table(raid_table_header); | |
4558 | remove_proc_entry("mdstat", NULL); | |
4559 | ITERATE_MDDEV(mddev,tmp) { | |
4560 | struct gendisk *disk = mddev->gendisk; | |
4561 | if (!disk) | |
4562 | continue; | |
4563 | export_array(mddev); | |
4564 | del_gendisk(disk); | |
4565 | put_disk(disk); | |
4566 | mddev->gendisk = NULL; | |
4567 | mddev_put(mddev); | |
4568 | } | |
4569 | } | |
4570 | ||
4571 | module_init(md_init) | |
4572 | module_exit(md_exit) | |
4573 | ||
f91de92e N |
4574 | static int get_ro(char *buffer, struct kernel_param *kp) |
4575 | { | |
4576 | return sprintf(buffer, "%d", start_readonly); | |
4577 | } | |
4578 | static int set_ro(const char *val, struct kernel_param *kp) | |
4579 | { | |
4580 | char *e; | |
4581 | int num = simple_strtoul(val, &e, 10); | |
4582 | if (*val && (*e == '\0' || *e == '\n')) { | |
4583 | start_readonly = num; | |
4584 | return 0;; | |
4585 | } | |
4586 | return -EINVAL; | |
4587 | } | |
4588 | ||
4589 | module_param_call(start_ro, set_ro, get_ro, NULL, 0600); | |
6ff8d8ec N |
4590 | module_param(start_dirty_degraded, int, 0644); |
4591 | ||
f91de92e | 4592 | |
1da177e4 LT |
4593 | EXPORT_SYMBOL(register_md_personality); |
4594 | EXPORT_SYMBOL(unregister_md_personality); | |
4595 | EXPORT_SYMBOL(md_error); | |
4596 | EXPORT_SYMBOL(md_done_sync); | |
4597 | EXPORT_SYMBOL(md_write_start); | |
4598 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
4599 | EXPORT_SYMBOL(md_register_thread); |
4600 | EXPORT_SYMBOL(md_unregister_thread); | |
4601 | EXPORT_SYMBOL(md_wakeup_thread); | |
4602 | EXPORT_SYMBOL(md_print_devices); | |
4603 | EXPORT_SYMBOL(md_check_recovery); | |
4604 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 4605 | MODULE_ALIAS("md"); |
72008652 | 4606 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |