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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/config.h> | |
a6fb0934 | 37 | #include <linux/kthread.h> |
1da177e4 LT |
38 | #include <linux/linkage.h> |
39 | #include <linux/raid/md.h> | |
32a7627c | 40 | #include <linux/raid/bitmap.h> |
1da177e4 LT |
41 | #include <linux/sysctl.h> |
42 | #include <linux/devfs_fs_kernel.h> | |
43 | #include <linux/buffer_head.h> /* for invalidate_bdev */ | |
44 | #include <linux/suspend.h> | |
d7603b7e | 45 | #include <linux/poll.h> |
1da177e4 LT |
46 | |
47 | #include <linux/init.h> | |
48 | ||
32a7627c N |
49 | #include <linux/file.h> |
50 | ||
1da177e4 LT |
51 | #ifdef CONFIG_KMOD |
52 | #include <linux/kmod.h> | |
53 | #endif | |
54 | ||
55 | #include <asm/unaligned.h> | |
56 | ||
57 | #define MAJOR_NR MD_MAJOR | |
58 | #define MD_DRIVER | |
59 | ||
60 | /* 63 partitions with the alternate major number (mdp) */ | |
61 | #define MdpMinorShift 6 | |
62 | ||
63 | #define DEBUG 0 | |
64 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
65 | ||
66 | ||
67 | #ifndef MODULE | |
68 | static void autostart_arrays (int part); | |
69 | #endif | |
70 | ||
2604b703 | 71 | static LIST_HEAD(pers_list); |
1da177e4 LT |
72 | static DEFINE_SPINLOCK(pers_lock); |
73 | ||
74 | /* | |
75 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
76 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
77 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 78 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
79 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
80 | * speed limit - in case reconstruction slows down your system despite | |
81 | * idle IO detection. | |
82 | * | |
83 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
84 | */ | |
85 | ||
86 | static int sysctl_speed_limit_min = 1000; | |
87 | static int sysctl_speed_limit_max = 200000; | |
88 | ||
89 | static struct ctl_table_header *raid_table_header; | |
90 | ||
91 | static ctl_table raid_table[] = { | |
92 | { | |
93 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
94 | .procname = "speed_limit_min", | |
95 | .data = &sysctl_speed_limit_min, | |
96 | .maxlen = sizeof(int), | |
97 | .mode = 0644, | |
98 | .proc_handler = &proc_dointvec, | |
99 | }, | |
100 | { | |
101 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
102 | .procname = "speed_limit_max", | |
103 | .data = &sysctl_speed_limit_max, | |
104 | .maxlen = sizeof(int), | |
105 | .mode = 0644, | |
106 | .proc_handler = &proc_dointvec, | |
107 | }, | |
108 | { .ctl_name = 0 } | |
109 | }; | |
110 | ||
111 | static ctl_table raid_dir_table[] = { | |
112 | { | |
113 | .ctl_name = DEV_RAID, | |
114 | .procname = "raid", | |
115 | .maxlen = 0, | |
116 | .mode = 0555, | |
117 | .child = raid_table, | |
118 | }, | |
119 | { .ctl_name = 0 } | |
120 | }; | |
121 | ||
122 | static ctl_table raid_root_table[] = { | |
123 | { | |
124 | .ctl_name = CTL_DEV, | |
125 | .procname = "dev", | |
126 | .maxlen = 0, | |
127 | .mode = 0555, | |
128 | .child = raid_dir_table, | |
129 | }, | |
130 | { .ctl_name = 0 } | |
131 | }; | |
132 | ||
133 | static struct block_device_operations md_fops; | |
134 | ||
f91de92e N |
135 | static int start_readonly; |
136 | ||
d7603b7e N |
137 | /* |
138 | * We have a system wide 'event count' that is incremented | |
139 | * on any 'interesting' event, and readers of /proc/mdstat | |
140 | * can use 'poll' or 'select' to find out when the event | |
141 | * count increases. | |
142 | * | |
143 | * Events are: | |
144 | * start array, stop array, error, add device, remove device, | |
145 | * start build, activate spare | |
146 | */ | |
2989ddbd | 147 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 148 | static atomic_t md_event_count; |
07dbd377 | 149 | static void md_new_event(mddev_t *mddev) |
d7603b7e N |
150 | { |
151 | atomic_inc(&md_event_count); | |
152 | wake_up(&md_event_waiters); | |
153 | } | |
154 | ||
1da177e4 LT |
155 | /* |
156 | * Enables to iterate over all existing md arrays | |
157 | * all_mddevs_lock protects this list. | |
158 | */ | |
159 | static LIST_HEAD(all_mddevs); | |
160 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
161 | ||
162 | ||
163 | /* | |
164 | * iterates through all used mddevs in the system. | |
165 | * We take care to grab the all_mddevs_lock whenever navigating | |
166 | * the list, and to always hold a refcount when unlocked. | |
167 | * Any code which breaks out of this loop while own | |
168 | * a reference to the current mddev and must mddev_put it. | |
169 | */ | |
170 | #define ITERATE_MDDEV(mddev,tmp) \ | |
171 | \ | |
172 | for (({ spin_lock(&all_mddevs_lock); \ | |
173 | tmp = all_mddevs.next; \ | |
174 | mddev = NULL;}); \ | |
175 | ({ if (tmp != &all_mddevs) \ | |
176 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
177 | spin_unlock(&all_mddevs_lock); \ | |
178 | if (mddev) mddev_put(mddev); \ | |
179 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
180 | tmp != &all_mddevs;}); \ | |
181 | ({ spin_lock(&all_mddevs_lock); \ | |
182 | tmp = tmp->next;}) \ | |
183 | ) | |
184 | ||
185 | ||
186 | static int md_fail_request (request_queue_t *q, struct bio *bio) | |
187 | { | |
188 | bio_io_error(bio, bio->bi_size); | |
189 | return 0; | |
190 | } | |
191 | ||
192 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
193 | { | |
194 | atomic_inc(&mddev->active); | |
195 | return mddev; | |
196 | } | |
197 | ||
198 | static void mddev_put(mddev_t *mddev) | |
199 | { | |
200 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
201 | return; | |
202 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
203 | list_del(&mddev->all_mddevs); | |
204 | blk_put_queue(mddev->queue); | |
eae1701f | 205 | kobject_unregister(&mddev->kobj); |
1da177e4 LT |
206 | } |
207 | spin_unlock(&all_mddevs_lock); | |
208 | } | |
209 | ||
210 | static mddev_t * mddev_find(dev_t unit) | |
211 | { | |
212 | mddev_t *mddev, *new = NULL; | |
213 | ||
214 | retry: | |
215 | spin_lock(&all_mddevs_lock); | |
216 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
217 | if (mddev->unit == unit) { | |
218 | mddev_get(mddev); | |
219 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 220 | kfree(new); |
1da177e4 LT |
221 | return mddev; |
222 | } | |
223 | ||
224 | if (new) { | |
225 | list_add(&new->all_mddevs, &all_mddevs); | |
226 | spin_unlock(&all_mddevs_lock); | |
227 | return new; | |
228 | } | |
229 | spin_unlock(&all_mddevs_lock); | |
230 | ||
9ffae0cf | 231 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
232 | if (!new) |
233 | return NULL; | |
234 | ||
1da177e4 LT |
235 | new->unit = unit; |
236 | if (MAJOR(unit) == MD_MAJOR) | |
237 | new->md_minor = MINOR(unit); | |
238 | else | |
239 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
240 | ||
241 | init_MUTEX(&new->reconfig_sem); | |
242 | INIT_LIST_HEAD(&new->disks); | |
243 | INIT_LIST_HEAD(&new->all_mddevs); | |
244 | init_timer(&new->safemode_timer); | |
245 | atomic_set(&new->active, 1); | |
06d91a5f | 246 | spin_lock_init(&new->write_lock); |
3d310eb7 | 247 | init_waitqueue_head(&new->sb_wait); |
1da177e4 LT |
248 | |
249 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
250 | if (!new->queue) { | |
251 | kfree(new); | |
252 | return NULL; | |
253 | } | |
254 | ||
255 | blk_queue_make_request(new->queue, md_fail_request); | |
256 | ||
257 | goto retry; | |
258 | } | |
259 | ||
260 | static inline int mddev_lock(mddev_t * mddev) | |
261 | { | |
262 | return down_interruptible(&mddev->reconfig_sem); | |
263 | } | |
264 | ||
265 | static inline void mddev_lock_uninterruptible(mddev_t * mddev) | |
266 | { | |
267 | down(&mddev->reconfig_sem); | |
268 | } | |
269 | ||
270 | static inline int mddev_trylock(mddev_t * mddev) | |
271 | { | |
272 | return down_trylock(&mddev->reconfig_sem); | |
273 | } | |
274 | ||
275 | static inline void mddev_unlock(mddev_t * mddev) | |
276 | { | |
277 | up(&mddev->reconfig_sem); | |
278 | ||
005eca5e | 279 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
280 | } |
281 | ||
2989ddbd | 282 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 LT |
283 | { |
284 | mdk_rdev_t * rdev; | |
285 | struct list_head *tmp; | |
286 | ||
287 | ITERATE_RDEV(mddev,rdev,tmp) { | |
288 | if (rdev->desc_nr == nr) | |
289 | return rdev; | |
290 | } | |
291 | return NULL; | |
292 | } | |
293 | ||
294 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
295 | { | |
296 | struct list_head *tmp; | |
297 | mdk_rdev_t *rdev; | |
298 | ||
299 | ITERATE_RDEV(mddev,rdev,tmp) { | |
300 | if (rdev->bdev->bd_dev == dev) | |
301 | return rdev; | |
302 | } | |
303 | return NULL; | |
304 | } | |
305 | ||
2604b703 N |
306 | static struct mdk_personality *find_pers(int level) |
307 | { | |
308 | struct mdk_personality *pers; | |
309 | list_for_each_entry(pers, &pers_list, list) | |
310 | if (pers->level == level) | |
311 | return pers; | |
312 | return NULL; | |
313 | } | |
314 | ||
77933d72 | 315 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 LT |
316 | { |
317 | sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
318 | return MD_NEW_SIZE_BLOCKS(size); | |
319 | } | |
320 | ||
321 | static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) | |
322 | { | |
323 | sector_t size; | |
324 | ||
325 | size = rdev->sb_offset; | |
326 | ||
327 | if (chunk_size) | |
328 | size &= ~((sector_t)chunk_size/1024 - 1); | |
329 | return size; | |
330 | } | |
331 | ||
332 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
333 | { | |
334 | if (rdev->sb_page) | |
335 | MD_BUG(); | |
336 | ||
337 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
338 | if (!rdev->sb_page) { | |
339 | printk(KERN_ALERT "md: out of memory.\n"); | |
340 | return -EINVAL; | |
341 | } | |
342 | ||
343 | return 0; | |
344 | } | |
345 | ||
346 | static void free_disk_sb(mdk_rdev_t * rdev) | |
347 | { | |
348 | if (rdev->sb_page) { | |
2d1f3b5d | 349 | put_page(rdev->sb_page); |
1da177e4 LT |
350 | rdev->sb_loaded = 0; |
351 | rdev->sb_page = NULL; | |
352 | rdev->sb_offset = 0; | |
353 | rdev->size = 0; | |
354 | } | |
355 | } | |
356 | ||
357 | ||
7bfa19f2 N |
358 | static int super_written(struct bio *bio, unsigned int bytes_done, int error) |
359 | { | |
360 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 361 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 N |
362 | if (bio->bi_size) |
363 | return 1; | |
364 | ||
365 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
a9701a30 | 366 | md_error(mddev, rdev); |
7bfa19f2 | 367 | |
a9701a30 N |
368 | if (atomic_dec_and_test(&mddev->pending_writes)) |
369 | wake_up(&mddev->sb_wait); | |
f8b58edf | 370 | bio_put(bio); |
7bfa19f2 N |
371 | return 0; |
372 | } | |
373 | ||
a9701a30 N |
374 | static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) |
375 | { | |
376 | struct bio *bio2 = bio->bi_private; | |
377 | mdk_rdev_t *rdev = bio2->bi_private; | |
378 | mddev_t *mddev = rdev->mddev; | |
379 | if (bio->bi_size) | |
380 | return 1; | |
381 | ||
382 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
383 | error == -EOPNOTSUPP) { | |
384 | unsigned long flags; | |
385 | /* barriers don't appear to be supported :-( */ | |
386 | set_bit(BarriersNotsupp, &rdev->flags); | |
387 | mddev->barriers_work = 0; | |
388 | spin_lock_irqsave(&mddev->write_lock, flags); | |
389 | bio2->bi_next = mddev->biolist; | |
390 | mddev->biolist = bio2; | |
391 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
392 | wake_up(&mddev->sb_wait); | |
393 | bio_put(bio); | |
394 | return 0; | |
395 | } | |
396 | bio_put(bio2); | |
397 | bio->bi_private = rdev; | |
398 | return super_written(bio, bytes_done, error); | |
399 | } | |
400 | ||
7bfa19f2 N |
401 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
402 | sector_t sector, int size, struct page *page) | |
403 | { | |
404 | /* write first size bytes of page to sector of rdev | |
405 | * Increment mddev->pending_writes before returning | |
406 | * and decrement it on completion, waking up sb_wait | |
407 | * if zero is reached. | |
408 | * If an error occurred, call md_error | |
a9701a30 N |
409 | * |
410 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
411 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
412 | */ |
413 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 414 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
415 | |
416 | bio->bi_bdev = rdev->bdev; | |
417 | bio->bi_sector = sector; | |
418 | bio_add_page(bio, page, size, 0); | |
419 | bio->bi_private = rdev; | |
420 | bio->bi_end_io = super_written; | |
a9701a30 N |
421 | bio->bi_rw = rw; |
422 | ||
7bfa19f2 | 423 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
424 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
425 | struct bio *rbio; | |
426 | rw |= (1<<BIO_RW_BARRIER); | |
427 | rbio = bio_clone(bio, GFP_NOIO); | |
428 | rbio->bi_private = bio; | |
429 | rbio->bi_end_io = super_written_barrier; | |
430 | submit_bio(rw, rbio); | |
431 | } else | |
432 | submit_bio(rw, bio); | |
433 | } | |
434 | ||
435 | void md_super_wait(mddev_t *mddev) | |
436 | { | |
437 | /* wait for all superblock writes that were scheduled to complete. | |
438 | * if any had to be retried (due to BARRIER problems), retry them | |
439 | */ | |
440 | DEFINE_WAIT(wq); | |
441 | for(;;) { | |
442 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
443 | if (atomic_read(&mddev->pending_writes)==0) | |
444 | break; | |
445 | while (mddev->biolist) { | |
446 | struct bio *bio; | |
447 | spin_lock_irq(&mddev->write_lock); | |
448 | bio = mddev->biolist; | |
449 | mddev->biolist = bio->bi_next ; | |
450 | bio->bi_next = NULL; | |
451 | spin_unlock_irq(&mddev->write_lock); | |
452 | submit_bio(bio->bi_rw, bio); | |
453 | } | |
454 | schedule(); | |
455 | } | |
456 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
457 | } |
458 | ||
1da177e4 LT |
459 | static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) |
460 | { | |
461 | if (bio->bi_size) | |
462 | return 1; | |
463 | ||
464 | complete((struct completion*)bio->bi_private); | |
465 | return 0; | |
466 | } | |
467 | ||
a654b9d8 | 468 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
469 | struct page *page, int rw) |
470 | { | |
baaa2c51 | 471 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
472 | struct completion event; |
473 | int ret; | |
474 | ||
475 | rw |= (1 << BIO_RW_SYNC); | |
476 | ||
477 | bio->bi_bdev = bdev; | |
478 | bio->bi_sector = sector; | |
479 | bio_add_page(bio, page, size, 0); | |
480 | init_completion(&event); | |
481 | bio->bi_private = &event; | |
482 | bio->bi_end_io = bi_complete; | |
483 | submit_bio(rw, bio); | |
484 | wait_for_completion(&event); | |
485 | ||
486 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
487 | bio_put(bio); | |
488 | return ret; | |
489 | } | |
a8745db2 | 490 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 491 | |
0002b271 | 492 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
493 | { |
494 | char b[BDEVNAME_SIZE]; | |
495 | if (!rdev->sb_page) { | |
496 | MD_BUG(); | |
497 | return -EINVAL; | |
498 | } | |
499 | if (rdev->sb_loaded) | |
500 | return 0; | |
501 | ||
502 | ||
0002b271 | 503 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
504 | goto fail; |
505 | rdev->sb_loaded = 1; | |
506 | return 0; | |
507 | ||
508 | fail: | |
509 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
510 | bdevname(rdev->bdev,b)); | |
511 | return -EINVAL; | |
512 | } | |
513 | ||
514 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
515 | { | |
516 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
517 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
518 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
519 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
520 | ||
521 | return 1; | |
522 | ||
523 | return 0; | |
524 | } | |
525 | ||
526 | ||
527 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
528 | { | |
529 | int ret; | |
530 | mdp_super_t *tmp1, *tmp2; | |
531 | ||
532 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
533 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
534 | ||
535 | if (!tmp1 || !tmp2) { | |
536 | ret = 0; | |
537 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
538 | goto abort; | |
539 | } | |
540 | ||
541 | *tmp1 = *sb1; | |
542 | *tmp2 = *sb2; | |
543 | ||
544 | /* | |
545 | * nr_disks is not constant | |
546 | */ | |
547 | tmp1->nr_disks = 0; | |
548 | tmp2->nr_disks = 0; | |
549 | ||
550 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
551 | ret = 0; | |
552 | else | |
553 | ret = 1; | |
554 | ||
555 | abort: | |
990a8baf JJ |
556 | kfree(tmp1); |
557 | kfree(tmp2); | |
1da177e4 LT |
558 | return ret; |
559 | } | |
560 | ||
561 | static unsigned int calc_sb_csum(mdp_super_t * sb) | |
562 | { | |
563 | unsigned int disk_csum, csum; | |
564 | ||
565 | disk_csum = sb->sb_csum; | |
566 | sb->sb_csum = 0; | |
567 | csum = csum_partial((void *)sb, MD_SB_BYTES, 0); | |
568 | sb->sb_csum = disk_csum; | |
569 | return csum; | |
570 | } | |
571 | ||
572 | ||
573 | /* | |
574 | * Handle superblock details. | |
575 | * We want to be able to handle multiple superblock formats | |
576 | * so we have a common interface to them all, and an array of | |
577 | * different handlers. | |
578 | * We rely on user-space to write the initial superblock, and support | |
579 | * reading and updating of superblocks. | |
580 | * Interface methods are: | |
581 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
582 | * loads and validates a superblock on dev. | |
583 | * if refdev != NULL, compare superblocks on both devices | |
584 | * Return: | |
585 | * 0 - dev has a superblock that is compatible with refdev | |
586 | * 1 - dev has a superblock that is compatible and newer than refdev | |
587 | * so dev should be used as the refdev in future | |
588 | * -EINVAL superblock incompatible or invalid | |
589 | * -othererror e.g. -EIO | |
590 | * | |
591 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
592 | * Verify that dev is acceptable into mddev. | |
593 | * The first time, mddev->raid_disks will be 0, and data from | |
594 | * dev should be merged in. Subsequent calls check that dev | |
595 | * is new enough. Return 0 or -EINVAL | |
596 | * | |
597 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
598 | * Update the superblock for rdev with data in mddev | |
599 | * This does not write to disc. | |
600 | * | |
601 | */ | |
602 | ||
603 | struct super_type { | |
604 | char *name; | |
605 | struct module *owner; | |
606 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
607 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
608 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
609 | }; | |
610 | ||
611 | /* | |
612 | * load_super for 0.90.0 | |
613 | */ | |
614 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
615 | { | |
616 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
617 | mdp_super_t *sb; | |
618 | int ret; | |
619 | sector_t sb_offset; | |
620 | ||
621 | /* | |
622 | * Calculate the position of the superblock, | |
623 | * it's at the end of the disk. | |
624 | * | |
625 | * It also happens to be a multiple of 4Kb. | |
626 | */ | |
627 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
628 | rdev->sb_offset = sb_offset; | |
629 | ||
0002b271 | 630 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
631 | if (ret) return ret; |
632 | ||
633 | ret = -EINVAL; | |
634 | ||
635 | bdevname(rdev->bdev, b); | |
636 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
637 | ||
638 | if (sb->md_magic != MD_SB_MAGIC) { | |
639 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
640 | b); | |
641 | goto abort; | |
642 | } | |
643 | ||
644 | if (sb->major_version != 0 || | |
645 | sb->minor_version != 90) { | |
646 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", | |
647 | sb->major_version, sb->minor_version, | |
648 | b); | |
649 | goto abort; | |
650 | } | |
651 | ||
652 | if (sb->raid_disks <= 0) | |
653 | goto abort; | |
654 | ||
655 | if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) { | |
656 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", | |
657 | b); | |
658 | goto abort; | |
659 | } | |
660 | ||
661 | rdev->preferred_minor = sb->md_minor; | |
662 | rdev->data_offset = 0; | |
0002b271 | 663 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
664 | |
665 | if (sb->level == LEVEL_MULTIPATH) | |
666 | rdev->desc_nr = -1; | |
667 | else | |
668 | rdev->desc_nr = sb->this_disk.number; | |
669 | ||
670 | if (refdev == 0) | |
671 | ret = 1; | |
672 | else { | |
673 | __u64 ev1, ev2; | |
674 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
675 | if (!uuid_equal(refsb, sb)) { | |
676 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
677 | b, bdevname(refdev->bdev,b2)); | |
678 | goto abort; | |
679 | } | |
680 | if (!sb_equal(refsb, sb)) { | |
681 | printk(KERN_WARNING "md: %s has same UUID" | |
682 | " but different superblock to %s\n", | |
683 | b, bdevname(refdev->bdev, b2)); | |
684 | goto abort; | |
685 | } | |
686 | ev1 = md_event(sb); | |
687 | ev2 = md_event(refsb); | |
688 | if (ev1 > ev2) | |
689 | ret = 1; | |
690 | else | |
691 | ret = 0; | |
692 | } | |
693 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
694 | ||
695 | abort: | |
696 | return ret; | |
697 | } | |
698 | ||
699 | /* | |
700 | * validate_super for 0.90.0 | |
701 | */ | |
702 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
703 | { | |
704 | mdp_disk_t *desc; | |
705 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
706 | ||
41158c7e | 707 | rdev->raid_disk = -1; |
b2d444d7 | 708 | rdev->flags = 0; |
1da177e4 LT |
709 | if (mddev->raid_disks == 0) { |
710 | mddev->major_version = 0; | |
711 | mddev->minor_version = sb->minor_version; | |
712 | mddev->patch_version = sb->patch_version; | |
713 | mddev->persistent = ! sb->not_persistent; | |
714 | mddev->chunk_size = sb->chunk_size; | |
715 | mddev->ctime = sb->ctime; | |
716 | mddev->utime = sb->utime; | |
717 | mddev->level = sb->level; | |
718 | mddev->layout = sb->layout; | |
719 | mddev->raid_disks = sb->raid_disks; | |
720 | mddev->size = sb->size; | |
721 | mddev->events = md_event(sb); | |
9223214e | 722 | mddev->bitmap_offset = 0; |
36fa3063 | 723 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 LT |
724 | |
725 | if (sb->state & (1<<MD_SB_CLEAN)) | |
726 | mddev->recovery_cp = MaxSector; | |
727 | else { | |
728 | if (sb->events_hi == sb->cp_events_hi && | |
729 | sb->events_lo == sb->cp_events_lo) { | |
730 | mddev->recovery_cp = sb->recovery_cp; | |
731 | } else | |
732 | mddev->recovery_cp = 0; | |
733 | } | |
734 | ||
735 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
736 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
737 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
738 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
739 | ||
740 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
741 | |
742 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
743 | mddev->bitmap_file == NULL) { | |
6cce3b23 N |
744 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 |
745 | && mddev->level != 10) { | |
a654b9d8 | 746 | /* FIXME use a better test */ |
6cce3b23 | 747 | printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); |
a654b9d8 N |
748 | return -EINVAL; |
749 | } | |
36fa3063 | 750 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 N |
751 | } |
752 | ||
41158c7e N |
753 | } else if (mddev->pers == NULL) { |
754 | /* Insist on good event counter while assembling */ | |
755 | __u64 ev1 = md_event(sb); | |
1da177e4 LT |
756 | ++ev1; |
757 | if (ev1 < mddev->events) | |
758 | return -EINVAL; | |
41158c7e N |
759 | } else if (mddev->bitmap) { |
760 | /* if adding to array with a bitmap, then we can accept an | |
761 | * older device ... but not too old. | |
762 | */ | |
763 | __u64 ev1 = md_event(sb); | |
764 | if (ev1 < mddev->bitmap->events_cleared) | |
765 | return 0; | |
766 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
767 | return 0; | |
768 | ||
1da177e4 | 769 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
770 | desc = sb->disks + rdev->desc_nr; |
771 | ||
772 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 773 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
774 | else if (desc->state & (1<<MD_DISK_SYNC) && |
775 | desc->raid_disk < mddev->raid_disks) { | |
b2d444d7 | 776 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
777 | rdev->raid_disk = desc->raid_disk; |
778 | } | |
8ddf9efe N |
779 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
780 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 781 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 782 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
783 | return 0; |
784 | } | |
785 | ||
786 | /* | |
787 | * sync_super for 0.90.0 | |
788 | */ | |
789 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
790 | { | |
791 | mdp_super_t *sb; | |
792 | struct list_head *tmp; | |
793 | mdk_rdev_t *rdev2; | |
794 | int next_spare = mddev->raid_disks; | |
19133a42 | 795 | |
1da177e4 LT |
796 | |
797 | /* make rdev->sb match mddev data.. | |
798 | * | |
799 | * 1/ zero out disks | |
800 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
801 | * 3/ any empty disks < next_spare become removed | |
802 | * | |
803 | * disks[0] gets initialised to REMOVED because | |
804 | * we cannot be sure from other fields if it has | |
805 | * been initialised or not. | |
806 | */ | |
807 | int i; | |
808 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
809 | ||
61181565 N |
810 | rdev->sb_size = MD_SB_BYTES; |
811 | ||
1da177e4 LT |
812 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
813 | ||
814 | memset(sb, 0, sizeof(*sb)); | |
815 | ||
816 | sb->md_magic = MD_SB_MAGIC; | |
817 | sb->major_version = mddev->major_version; | |
818 | sb->minor_version = mddev->minor_version; | |
819 | sb->patch_version = mddev->patch_version; | |
820 | sb->gvalid_words = 0; /* ignored */ | |
821 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
822 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
823 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
824 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
825 | ||
826 | sb->ctime = mddev->ctime; | |
827 | sb->level = mddev->level; | |
828 | sb->size = mddev->size; | |
829 | sb->raid_disks = mddev->raid_disks; | |
830 | sb->md_minor = mddev->md_minor; | |
831 | sb->not_persistent = !mddev->persistent; | |
832 | sb->utime = mddev->utime; | |
833 | sb->state = 0; | |
834 | sb->events_hi = (mddev->events>>32); | |
835 | sb->events_lo = (u32)mddev->events; | |
836 | ||
837 | if (mddev->in_sync) | |
838 | { | |
839 | sb->recovery_cp = mddev->recovery_cp; | |
840 | sb->cp_events_hi = (mddev->events>>32); | |
841 | sb->cp_events_lo = (u32)mddev->events; | |
842 | if (mddev->recovery_cp == MaxSector) | |
843 | sb->state = (1<< MD_SB_CLEAN); | |
844 | } else | |
845 | sb->recovery_cp = 0; | |
846 | ||
847 | sb->layout = mddev->layout; | |
848 | sb->chunk_size = mddev->chunk_size; | |
849 | ||
a654b9d8 N |
850 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
851 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
852 | ||
1da177e4 LT |
853 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
854 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
855 | mdp_disk_t *d; | |
86e6ffdd | 856 | int desc_nr; |
b2d444d7 N |
857 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
858 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 859 | desc_nr = rdev2->raid_disk; |
1da177e4 | 860 | else |
86e6ffdd | 861 | desc_nr = next_spare++; |
19133a42 | 862 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
863 | d = &sb->disks[rdev2->desc_nr]; |
864 | nr_disks++; | |
865 | d->number = rdev2->desc_nr; | |
866 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
867 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
868 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
869 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
870 | d->raid_disk = rdev2->raid_disk; |
871 | else | |
872 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
b2d444d7 | 873 | if (test_bit(Faulty, &rdev2->flags)) { |
1da177e4 LT |
874 | d->state = (1<<MD_DISK_FAULTY); |
875 | failed++; | |
b2d444d7 | 876 | } else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
877 | d->state = (1<<MD_DISK_ACTIVE); |
878 | d->state |= (1<<MD_DISK_SYNC); | |
879 | active++; | |
880 | working++; | |
881 | } else { | |
882 | d->state = 0; | |
883 | spare++; | |
884 | working++; | |
885 | } | |
8ddf9efe N |
886 | if (test_bit(WriteMostly, &rdev2->flags)) |
887 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 888 | } |
1da177e4 LT |
889 | /* now set the "removed" and "faulty" bits on any missing devices */ |
890 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
891 | mdp_disk_t *d = &sb->disks[i]; | |
892 | if (d->state == 0 && d->number == 0) { | |
893 | d->number = i; | |
894 | d->raid_disk = i; | |
895 | d->state = (1<<MD_DISK_REMOVED); | |
896 | d->state |= (1<<MD_DISK_FAULTY); | |
897 | failed++; | |
898 | } | |
899 | } | |
900 | sb->nr_disks = nr_disks; | |
901 | sb->active_disks = active; | |
902 | sb->working_disks = working; | |
903 | sb->failed_disks = failed; | |
904 | sb->spare_disks = spare; | |
905 | ||
906 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
907 | sb->sb_csum = calc_sb_csum(sb); | |
908 | } | |
909 | ||
910 | /* | |
911 | * version 1 superblock | |
912 | */ | |
913 | ||
914 | static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) | |
915 | { | |
916 | unsigned int disk_csum, csum; | |
917 | unsigned long long newcsum; | |
918 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
919 | unsigned int *isuper = (unsigned int*)sb; | |
920 | int i; | |
921 | ||
922 | disk_csum = sb->sb_csum; | |
923 | sb->sb_csum = 0; | |
924 | newcsum = 0; | |
925 | for (i=0; size>=4; size -= 4 ) | |
926 | newcsum += le32_to_cpu(*isuper++); | |
927 | ||
928 | if (size == 2) | |
929 | newcsum += le16_to_cpu(*(unsigned short*) isuper); | |
930 | ||
931 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
932 | sb->sb_csum = disk_csum; | |
933 | return cpu_to_le32(csum); | |
934 | } | |
935 | ||
936 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
937 | { | |
938 | struct mdp_superblock_1 *sb; | |
939 | int ret; | |
940 | sector_t sb_offset; | |
941 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 942 | int bmask; |
1da177e4 LT |
943 | |
944 | /* | |
945 | * Calculate the position of the superblock. | |
946 | * It is always aligned to a 4K boundary and | |
947 | * depeding on minor_version, it can be: | |
948 | * 0: At least 8K, but less than 12K, from end of device | |
949 | * 1: At start of device | |
950 | * 2: 4K from start of device. | |
951 | */ | |
952 | switch(minor_version) { | |
953 | case 0: | |
954 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
955 | sb_offset -= 8*2; | |
39730960 | 956 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
957 | /* convert from sectors to K */ |
958 | sb_offset /= 2; | |
959 | break; | |
960 | case 1: | |
961 | sb_offset = 0; | |
962 | break; | |
963 | case 2: | |
964 | sb_offset = 4; | |
965 | break; | |
966 | default: | |
967 | return -EINVAL; | |
968 | } | |
969 | rdev->sb_offset = sb_offset; | |
970 | ||
0002b271 N |
971 | /* superblock is rarely larger than 1K, but it can be larger, |
972 | * and it is safe to read 4k, so we do that | |
973 | */ | |
974 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
975 | if (ret) return ret; |
976 | ||
977 | ||
978 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
979 | ||
980 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
981 | sb->major_version != cpu_to_le32(1) || | |
982 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
983 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 984 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
985 | return -EINVAL; |
986 | ||
987 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
988 | printk("md: invalid superblock checksum on %s\n", | |
989 | bdevname(rdev->bdev,b)); | |
990 | return -EINVAL; | |
991 | } | |
992 | if (le64_to_cpu(sb->data_size) < 10) { | |
993 | printk("md: data_size too small on %s\n", | |
994 | bdevname(rdev->bdev,b)); | |
995 | return -EINVAL; | |
996 | } | |
997 | rdev->preferred_minor = 0xffff; | |
998 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
999 | ||
0002b271 | 1000 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1001 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 N |
1002 | if (rdev->sb_size & bmask) |
1003 | rdev-> sb_size = (rdev->sb_size | bmask)+1; | |
1004 | ||
1da177e4 LT |
1005 | if (refdev == 0) |
1006 | return 1; | |
1007 | else { | |
1008 | __u64 ev1, ev2; | |
1009 | struct mdp_superblock_1 *refsb = | |
1010 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1011 | ||
1012 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1013 | sb->level != refsb->level || | |
1014 | sb->layout != refsb->layout || | |
1015 | sb->chunksize != refsb->chunksize) { | |
1016 | printk(KERN_WARNING "md: %s has strangely different" | |
1017 | " superblock to %s\n", | |
1018 | bdevname(rdev->bdev,b), | |
1019 | bdevname(refdev->bdev,b2)); | |
1020 | return -EINVAL; | |
1021 | } | |
1022 | ev1 = le64_to_cpu(sb->events); | |
1023 | ev2 = le64_to_cpu(refsb->events); | |
1024 | ||
1025 | if (ev1 > ev2) | |
1026 | return 1; | |
1027 | } | |
1028 | if (minor_version) | |
1029 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; | |
1030 | else | |
1031 | rdev->size = rdev->sb_offset; | |
1032 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
1033 | return -EINVAL; | |
1034 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1035 | if (le32_to_cpu(sb->chunksize)) | |
1036 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
1037 | return 0; | |
1038 | } | |
1039 | ||
1040 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1041 | { | |
1042 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1043 | ||
41158c7e | 1044 | rdev->raid_disk = -1; |
b2d444d7 | 1045 | rdev->flags = 0; |
1da177e4 LT |
1046 | if (mddev->raid_disks == 0) { |
1047 | mddev->major_version = 1; | |
1048 | mddev->patch_version = 0; | |
1049 | mddev->persistent = 1; | |
1050 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; | |
1051 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1052 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1053 | mddev->level = le32_to_cpu(sb->level); | |
1054 | mddev->layout = le32_to_cpu(sb->layout); | |
1055 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1056 | mddev->size = le64_to_cpu(sb->size)/2; | |
1057 | mddev->events = le64_to_cpu(sb->events); | |
9223214e | 1058 | mddev->bitmap_offset = 0; |
53e87fbb | 1059 | mddev->default_bitmap_offset = 1024; |
1da177e4 LT |
1060 | |
1061 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1062 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1063 | ||
1064 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1065 | |
71c0805c | 1066 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
a654b9d8 | 1067 | mddev->bitmap_file == NULL ) { |
6cce3b23 N |
1068 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 |
1069 | && mddev->level != 10) { | |
1070 | printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); | |
a654b9d8 N |
1071 | return -EINVAL; |
1072 | } | |
1073 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); | |
1074 | } | |
41158c7e N |
1075 | } else if (mddev->pers == NULL) { |
1076 | /* Insist of good event counter while assembling */ | |
1077 | __u64 ev1 = le64_to_cpu(sb->events); | |
1da177e4 LT |
1078 | ++ev1; |
1079 | if (ev1 < mddev->events) | |
1080 | return -EINVAL; | |
41158c7e N |
1081 | } else if (mddev->bitmap) { |
1082 | /* If adding to array with a bitmap, then we can accept an | |
1083 | * older device, but not too old. | |
1084 | */ | |
1085 | __u64 ev1 = le64_to_cpu(sb->events); | |
1086 | if (ev1 < mddev->bitmap->events_cleared) | |
1087 | return 0; | |
1088 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1089 | return 0; | |
1da177e4 LT |
1090 | |
1091 | if (mddev->level != LEVEL_MULTIPATH) { | |
1092 | int role; | |
1093 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1094 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1095 | switch(role) { | |
1096 | case 0xffff: /* spare */ | |
1da177e4 LT |
1097 | break; |
1098 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1099 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1100 | break; |
1101 | default: | |
b2d444d7 | 1102 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1103 | rdev->raid_disk = role; |
1104 | break; | |
1105 | } | |
8ddf9efe N |
1106 | if (sb->devflags & WriteMostly1) |
1107 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1108 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1109 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1110 | |
1da177e4 LT |
1111 | return 0; |
1112 | } | |
1113 | ||
1114 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1115 | { | |
1116 | struct mdp_superblock_1 *sb; | |
1117 | struct list_head *tmp; | |
1118 | mdk_rdev_t *rdev2; | |
1119 | int max_dev, i; | |
1120 | /* make rdev->sb match mddev and rdev data. */ | |
1121 | ||
1122 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1123 | ||
1124 | sb->feature_map = 0; | |
1125 | sb->pad0 = 0; | |
1126 | memset(sb->pad1, 0, sizeof(sb->pad1)); | |
1127 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1128 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1129 | ||
1130 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1131 | sb->events = cpu_to_le64(mddev->events); | |
1132 | if (mddev->in_sync) | |
1133 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1134 | else | |
1135 | sb->resync_offset = cpu_to_le64(0); | |
1136 | ||
a654b9d8 N |
1137 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1138 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1139 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 N |
1140 | } |
1141 | ||
1da177e4 LT |
1142 | max_dev = 0; |
1143 | ITERATE_RDEV(mddev,rdev2,tmp) | |
1144 | if (rdev2->desc_nr+1 > max_dev) | |
1145 | max_dev = rdev2->desc_nr+1; | |
1146 | ||
1147 | sb->max_dev = cpu_to_le32(max_dev); | |
1148 | for (i=0; i<max_dev;i++) | |
1149 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1150 | ||
1151 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
1152 | i = rdev2->desc_nr; | |
b2d444d7 | 1153 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1154 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1155 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 LT |
1156 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1157 | else | |
1158 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1159 | } | |
1160 | ||
1161 | sb->recovery_offset = cpu_to_le64(0); /* not supported yet */ | |
1162 | sb->sb_csum = calc_sb_1_csum(sb); | |
1163 | } | |
1164 | ||
1165 | ||
75c96f85 | 1166 | static struct super_type super_types[] = { |
1da177e4 LT |
1167 | [0] = { |
1168 | .name = "0.90.0", | |
1169 | .owner = THIS_MODULE, | |
1170 | .load_super = super_90_load, | |
1171 | .validate_super = super_90_validate, | |
1172 | .sync_super = super_90_sync, | |
1173 | }, | |
1174 | [1] = { | |
1175 | .name = "md-1", | |
1176 | .owner = THIS_MODULE, | |
1177 | .load_super = super_1_load, | |
1178 | .validate_super = super_1_validate, | |
1179 | .sync_super = super_1_sync, | |
1180 | }, | |
1181 | }; | |
1182 | ||
1183 | static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) | |
1184 | { | |
1185 | struct list_head *tmp; | |
1186 | mdk_rdev_t *rdev; | |
1187 | ||
1188 | ITERATE_RDEV(mddev,rdev,tmp) | |
1189 | if (rdev->bdev->bd_contains == dev->bdev->bd_contains) | |
1190 | return rdev; | |
1191 | ||
1192 | return NULL; | |
1193 | } | |
1194 | ||
1195 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1196 | { | |
1197 | struct list_head *tmp; | |
1198 | mdk_rdev_t *rdev; | |
1199 | ||
1200 | ITERATE_RDEV(mddev1,rdev,tmp) | |
1201 | if (match_dev_unit(mddev2, rdev)) | |
1202 | return 1; | |
1203 | ||
1204 | return 0; | |
1205 | } | |
1206 | ||
1207 | static LIST_HEAD(pending_raid_disks); | |
1208 | ||
1209 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1210 | { | |
1211 | mdk_rdev_t *same_pdev; | |
1212 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
f637b9f9 | 1213 | struct kobject *ko; |
1da177e4 LT |
1214 | |
1215 | if (rdev->mddev) { | |
1216 | MD_BUG(); | |
1217 | return -EINVAL; | |
1218 | } | |
1219 | same_pdev = match_dev_unit(mddev, rdev); | |
1220 | if (same_pdev) | |
1221 | printk(KERN_WARNING | |
1222 | "%s: WARNING: %s appears to be on the same physical" | |
1223 | " disk as %s. True\n protection against single-disk" | |
1224 | " failure might be compromised.\n", | |
1225 | mdname(mddev), bdevname(rdev->bdev,b), | |
1226 | bdevname(same_pdev->bdev,b2)); | |
1227 | ||
1228 | /* Verify rdev->desc_nr is unique. | |
1229 | * If it is -1, assign a free number, else | |
1230 | * check number is not in use | |
1231 | */ | |
1232 | if (rdev->desc_nr < 0) { | |
1233 | int choice = 0; | |
1234 | if (mddev->pers) choice = mddev->raid_disks; | |
1235 | while (find_rdev_nr(mddev, choice)) | |
1236 | choice++; | |
1237 | rdev->desc_nr = choice; | |
1238 | } else { | |
1239 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1240 | return -EBUSY; | |
1241 | } | |
19133a42 N |
1242 | bdevname(rdev->bdev,b); |
1243 | if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) | |
1244 | return -ENOMEM; | |
1da177e4 LT |
1245 | |
1246 | list_add(&rdev->same_set, &mddev->disks); | |
1247 | rdev->mddev = mddev; | |
19133a42 | 1248 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1249 | |
9c791977 | 1250 | rdev->kobj.parent = &mddev->kobj; |
86e6ffdd N |
1251 | kobject_add(&rdev->kobj); |
1252 | ||
f637b9f9 N |
1253 | if (rdev->bdev->bd_part) |
1254 | ko = &rdev->bdev->bd_part->kobj; | |
1255 | else | |
1256 | ko = &rdev->bdev->bd_disk->kobj; | |
1257 | sysfs_create_link(&rdev->kobj, ko, "block"); | |
1da177e4 LT |
1258 | return 0; |
1259 | } | |
1260 | ||
1261 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) | |
1262 | { | |
1263 | char b[BDEVNAME_SIZE]; | |
1264 | if (!rdev->mddev) { | |
1265 | MD_BUG(); | |
1266 | return; | |
1267 | } | |
1268 | list_del_init(&rdev->same_set); | |
1269 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1270 | rdev->mddev = NULL; | |
86e6ffdd N |
1271 | sysfs_remove_link(&rdev->kobj, "block"); |
1272 | kobject_del(&rdev->kobj); | |
1da177e4 LT |
1273 | } |
1274 | ||
1275 | /* | |
1276 | * prevent the device from being mounted, repartitioned or | |
1277 | * otherwise reused by a RAID array (or any other kernel | |
1278 | * subsystem), by bd_claiming the device. | |
1279 | */ | |
1280 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) | |
1281 | { | |
1282 | int err = 0; | |
1283 | struct block_device *bdev; | |
1284 | char b[BDEVNAME_SIZE]; | |
1285 | ||
1286 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
1287 | if (IS_ERR(bdev)) { | |
1288 | printk(KERN_ERR "md: could not open %s.\n", | |
1289 | __bdevname(dev, b)); | |
1290 | return PTR_ERR(bdev); | |
1291 | } | |
1292 | err = bd_claim(bdev, rdev); | |
1293 | if (err) { | |
1294 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1295 | bdevname(bdev, b)); | |
1296 | blkdev_put(bdev); | |
1297 | return err; | |
1298 | } | |
1299 | rdev->bdev = bdev; | |
1300 | return err; | |
1301 | } | |
1302 | ||
1303 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1304 | { | |
1305 | struct block_device *bdev = rdev->bdev; | |
1306 | rdev->bdev = NULL; | |
1307 | if (!bdev) | |
1308 | MD_BUG(); | |
1309 | bd_release(bdev); | |
1310 | blkdev_put(bdev); | |
1311 | } | |
1312 | ||
1313 | void md_autodetect_dev(dev_t dev); | |
1314 | ||
1315 | static void export_rdev(mdk_rdev_t * rdev) | |
1316 | { | |
1317 | char b[BDEVNAME_SIZE]; | |
1318 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1319 | bdevname(rdev->bdev,b)); | |
1320 | if (rdev->mddev) | |
1321 | MD_BUG(); | |
1322 | free_disk_sb(rdev); | |
1323 | list_del_init(&rdev->same_set); | |
1324 | #ifndef MODULE | |
1325 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1326 | #endif | |
1327 | unlock_rdev(rdev); | |
86e6ffdd | 1328 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1329 | } |
1330 | ||
1331 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1332 | { | |
1333 | unbind_rdev_from_array(rdev); | |
1334 | export_rdev(rdev); | |
1335 | } | |
1336 | ||
1337 | static void export_array(mddev_t *mddev) | |
1338 | { | |
1339 | struct list_head *tmp; | |
1340 | mdk_rdev_t *rdev; | |
1341 | ||
1342 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1343 | if (!rdev->mddev) { | |
1344 | MD_BUG(); | |
1345 | continue; | |
1346 | } | |
1347 | kick_rdev_from_array(rdev); | |
1348 | } | |
1349 | if (!list_empty(&mddev->disks)) | |
1350 | MD_BUG(); | |
1351 | mddev->raid_disks = 0; | |
1352 | mddev->major_version = 0; | |
1353 | } | |
1354 | ||
1355 | static void print_desc(mdp_disk_t *desc) | |
1356 | { | |
1357 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1358 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1359 | } | |
1360 | ||
1361 | static void print_sb(mdp_super_t *sb) | |
1362 | { | |
1363 | int i; | |
1364 | ||
1365 | printk(KERN_INFO | |
1366 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1367 | sb->major_version, sb->minor_version, sb->patch_version, | |
1368 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1369 | sb->ctime); | |
1370 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1371 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1372 | sb->md_minor, sb->layout, sb->chunk_size); | |
1373 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1374 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1375 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1376 | sb->failed_disks, sb->spare_disks, | |
1377 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1378 | ||
1379 | printk(KERN_INFO); | |
1380 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1381 | mdp_disk_t *desc; | |
1382 | ||
1383 | desc = sb->disks + i; | |
1384 | if (desc->number || desc->major || desc->minor || | |
1385 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1386 | printk(" D %2d: ", i); | |
1387 | print_desc(desc); | |
1388 | } | |
1389 | } | |
1390 | printk(KERN_INFO "md: THIS: "); | |
1391 | print_desc(&sb->this_disk); | |
1392 | ||
1393 | } | |
1394 | ||
1395 | static void print_rdev(mdk_rdev_t *rdev) | |
1396 | { | |
1397 | char b[BDEVNAME_SIZE]; | |
1398 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1399 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1400 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1401 | rdev->desc_nr); | |
1da177e4 LT |
1402 | if (rdev->sb_loaded) { |
1403 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1404 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1405 | } else | |
1406 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1407 | } | |
1408 | ||
1409 | void md_print_devices(void) | |
1410 | { | |
1411 | struct list_head *tmp, *tmp2; | |
1412 | mdk_rdev_t *rdev; | |
1413 | mddev_t *mddev; | |
1414 | char b[BDEVNAME_SIZE]; | |
1415 | ||
1416 | printk("\n"); | |
1417 | printk("md: **********************************\n"); | |
1418 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1419 | printk("md: **********************************\n"); | |
1420 | ITERATE_MDDEV(mddev,tmp) { | |
1da177e4 | 1421 | |
32a7627c N |
1422 | if (mddev->bitmap) |
1423 | bitmap_print_sb(mddev->bitmap); | |
1424 | else | |
1425 | printk("%s: ", mdname(mddev)); | |
1da177e4 LT |
1426 | ITERATE_RDEV(mddev,rdev,tmp2) |
1427 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1428 | printk("\n"); | |
1429 | ||
1430 | ITERATE_RDEV(mddev,rdev,tmp2) | |
1431 | print_rdev(rdev); | |
1432 | } | |
1433 | printk("md: **********************************\n"); | |
1434 | printk("\n"); | |
1435 | } | |
1436 | ||
1437 | ||
1da177e4 LT |
1438 | static void sync_sbs(mddev_t * mddev) |
1439 | { | |
1440 | mdk_rdev_t *rdev; | |
1441 | struct list_head *tmp; | |
1442 | ||
1443 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1444 | super_types[mddev->major_version]. | |
1445 | sync_super(mddev, rdev); | |
1446 | rdev->sb_loaded = 1; | |
1447 | } | |
1448 | } | |
1449 | ||
1450 | static void md_update_sb(mddev_t * mddev) | |
1451 | { | |
7bfa19f2 | 1452 | int err; |
1da177e4 LT |
1453 | struct list_head *tmp; |
1454 | mdk_rdev_t *rdev; | |
06d91a5f | 1455 | int sync_req; |
1da177e4 | 1456 | |
1da177e4 | 1457 | repeat: |
a9701a30 | 1458 | spin_lock_irq(&mddev->write_lock); |
06d91a5f | 1459 | sync_req = mddev->in_sync; |
1da177e4 LT |
1460 | mddev->utime = get_seconds(); |
1461 | mddev->events ++; | |
1462 | ||
1463 | if (!mddev->events) { | |
1464 | /* | |
1465 | * oops, this 64-bit counter should never wrap. | |
1466 | * Either we are in around ~1 trillion A.C., assuming | |
1467 | * 1 reboot per second, or we have a bug: | |
1468 | */ | |
1469 | MD_BUG(); | |
1470 | mddev->events --; | |
1471 | } | |
7bfa19f2 | 1472 | mddev->sb_dirty = 2; |
1da177e4 LT |
1473 | sync_sbs(mddev); |
1474 | ||
1475 | /* | |
1476 | * do not write anything to disk if using | |
1477 | * nonpersistent superblocks | |
1478 | */ | |
06d91a5f N |
1479 | if (!mddev->persistent) { |
1480 | mddev->sb_dirty = 0; | |
a9701a30 | 1481 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1482 | wake_up(&mddev->sb_wait); |
1da177e4 | 1483 | return; |
06d91a5f | 1484 | } |
a9701a30 | 1485 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1486 | |
1487 | dprintk(KERN_INFO | |
1488 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1489 | mdname(mddev),mddev->in_sync); | |
1490 | ||
32a7627c | 1491 | err = bitmap_update_sb(mddev->bitmap); |
1da177e4 LT |
1492 | ITERATE_RDEV(mddev,rdev,tmp) { |
1493 | char b[BDEVNAME_SIZE]; | |
1494 | dprintk(KERN_INFO "md: "); | |
b2d444d7 | 1495 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1496 | dprintk("(skipping faulty "); |
1497 | ||
1498 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1499 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1500 | md_super_write(mddev,rdev, |
0002b271 | 1501 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1502 | rdev->sb_page); |
1503 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1504 | bdevname(rdev->bdev,b), | |
1505 | (unsigned long long)rdev->sb_offset); | |
1506 | ||
1da177e4 LT |
1507 | } else |
1508 | dprintk(")\n"); | |
7bfa19f2 | 1509 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1510 | /* only need to write one superblock... */ |
1511 | break; | |
1512 | } | |
a9701a30 | 1513 | md_super_wait(mddev); |
7bfa19f2 N |
1514 | /* if there was a failure, sb_dirty was set to 1, and we re-write super */ |
1515 | ||
a9701a30 | 1516 | spin_lock_irq(&mddev->write_lock); |
7bfa19f2 | 1517 | if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { |
06d91a5f | 1518 | /* have to write it out again */ |
a9701a30 | 1519 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1520 | goto repeat; |
1521 | } | |
1522 | mddev->sb_dirty = 0; | |
a9701a30 | 1523 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1524 | wake_up(&mddev->sb_wait); |
06d91a5f | 1525 | |
1da177e4 LT |
1526 | } |
1527 | ||
bce74dac N |
1528 | /* words written to sysfs files may, or my not, be \n terminated. |
1529 | * We want to accept with case. For this we use cmd_match. | |
1530 | */ | |
1531 | static int cmd_match(const char *cmd, const char *str) | |
1532 | { | |
1533 | /* See if cmd, written into a sysfs file, matches | |
1534 | * str. They must either be the same, or cmd can | |
1535 | * have a trailing newline | |
1536 | */ | |
1537 | while (*cmd && *str && *cmd == *str) { | |
1538 | cmd++; | |
1539 | str++; | |
1540 | } | |
1541 | if (*cmd == '\n') | |
1542 | cmd++; | |
1543 | if (*str || *cmd) | |
1544 | return 0; | |
1545 | return 1; | |
1546 | } | |
1547 | ||
86e6ffdd N |
1548 | struct rdev_sysfs_entry { |
1549 | struct attribute attr; | |
1550 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1551 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1552 | }; | |
1553 | ||
1554 | static ssize_t | |
96de1e66 | 1555 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1556 | { |
1557 | char *sep = ""; | |
1558 | int len=0; | |
1559 | ||
b2d444d7 | 1560 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1561 | len+= sprintf(page+len, "%sfaulty",sep); |
1562 | sep = ","; | |
1563 | } | |
b2d444d7 | 1564 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1565 | len += sprintf(page+len, "%sin_sync",sep); |
1566 | sep = ","; | |
1567 | } | |
b2d444d7 N |
1568 | if (!test_bit(Faulty, &rdev->flags) && |
1569 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1570 | len += sprintf(page+len, "%sspare", sep); |
1571 | sep = ","; | |
1572 | } | |
1573 | return len+sprintf(page+len, "\n"); | |
1574 | } | |
1575 | ||
96de1e66 N |
1576 | static struct rdev_sysfs_entry |
1577 | rdev_state = __ATTR_RO(state); | |
86e6ffdd N |
1578 | |
1579 | static ssize_t | |
96de1e66 | 1580 | super_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1581 | { |
1582 | if (rdev->sb_loaded && rdev->sb_size) { | |
1583 | memcpy(page, page_address(rdev->sb_page), rdev->sb_size); | |
1584 | return rdev->sb_size; | |
1585 | } else | |
1586 | return 0; | |
1587 | } | |
96de1e66 N |
1588 | static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); |
1589 | ||
86e6ffdd N |
1590 | static struct attribute *rdev_default_attrs[] = { |
1591 | &rdev_state.attr, | |
1592 | &rdev_super.attr, | |
1593 | NULL, | |
1594 | }; | |
1595 | static ssize_t | |
1596 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1597 | { | |
1598 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1599 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1600 | ||
1601 | if (!entry->show) | |
1602 | return -EIO; | |
1603 | return entry->show(rdev, page); | |
1604 | } | |
1605 | ||
1606 | static ssize_t | |
1607 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
1608 | const char *page, size_t length) | |
1609 | { | |
1610 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1611 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1612 | ||
1613 | if (!entry->store) | |
1614 | return -EIO; | |
1615 | return entry->store(rdev, page, length); | |
1616 | } | |
1617 | ||
1618 | static void rdev_free(struct kobject *ko) | |
1619 | { | |
1620 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
1621 | kfree(rdev); | |
1622 | } | |
1623 | static struct sysfs_ops rdev_sysfs_ops = { | |
1624 | .show = rdev_attr_show, | |
1625 | .store = rdev_attr_store, | |
1626 | }; | |
1627 | static struct kobj_type rdev_ktype = { | |
1628 | .release = rdev_free, | |
1629 | .sysfs_ops = &rdev_sysfs_ops, | |
1630 | .default_attrs = rdev_default_attrs, | |
1631 | }; | |
1632 | ||
1da177e4 LT |
1633 | /* |
1634 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
1635 | * | |
1636 | * mark the device faulty if: | |
1637 | * | |
1638 | * - the device is nonexistent (zero size) | |
1639 | * - the device has no valid superblock | |
1640 | * | |
1641 | * a faulty rdev _never_ has rdev->sb set. | |
1642 | */ | |
1643 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
1644 | { | |
1645 | char b[BDEVNAME_SIZE]; | |
1646 | int err; | |
1647 | mdk_rdev_t *rdev; | |
1648 | sector_t size; | |
1649 | ||
9ffae0cf | 1650 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
1651 | if (!rdev) { |
1652 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
1653 | return ERR_PTR(-ENOMEM); | |
1654 | } | |
1da177e4 LT |
1655 | |
1656 | if ((err = alloc_disk_sb(rdev))) | |
1657 | goto abort_free; | |
1658 | ||
1659 | err = lock_rdev(rdev, newdev); | |
1660 | if (err) | |
1661 | goto abort_free; | |
1662 | ||
86e6ffdd N |
1663 | rdev->kobj.parent = NULL; |
1664 | rdev->kobj.ktype = &rdev_ktype; | |
1665 | kobject_init(&rdev->kobj); | |
1666 | ||
1da177e4 | 1667 | rdev->desc_nr = -1; |
b2d444d7 | 1668 | rdev->flags = 0; |
1da177e4 LT |
1669 | rdev->data_offset = 0; |
1670 | atomic_set(&rdev->nr_pending, 0); | |
ba22dcbf | 1671 | atomic_set(&rdev->read_errors, 0); |
1da177e4 LT |
1672 | |
1673 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
1674 | if (!size) { | |
1675 | printk(KERN_WARNING | |
1676 | "md: %s has zero or unknown size, marking faulty!\n", | |
1677 | bdevname(rdev->bdev,b)); | |
1678 | err = -EINVAL; | |
1679 | goto abort_free; | |
1680 | } | |
1681 | ||
1682 | if (super_format >= 0) { | |
1683 | err = super_types[super_format]. | |
1684 | load_super(rdev, NULL, super_minor); | |
1685 | if (err == -EINVAL) { | |
1686 | printk(KERN_WARNING | |
1687 | "md: %s has invalid sb, not importing!\n", | |
1688 | bdevname(rdev->bdev,b)); | |
1689 | goto abort_free; | |
1690 | } | |
1691 | if (err < 0) { | |
1692 | printk(KERN_WARNING | |
1693 | "md: could not read %s's sb, not importing!\n", | |
1694 | bdevname(rdev->bdev,b)); | |
1695 | goto abort_free; | |
1696 | } | |
1697 | } | |
1698 | INIT_LIST_HEAD(&rdev->same_set); | |
1699 | ||
1700 | return rdev; | |
1701 | ||
1702 | abort_free: | |
1703 | if (rdev->sb_page) { | |
1704 | if (rdev->bdev) | |
1705 | unlock_rdev(rdev); | |
1706 | free_disk_sb(rdev); | |
1707 | } | |
1708 | kfree(rdev); | |
1709 | return ERR_PTR(err); | |
1710 | } | |
1711 | ||
1712 | /* | |
1713 | * Check a full RAID array for plausibility | |
1714 | */ | |
1715 | ||
1716 | ||
a757e64c | 1717 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
1718 | { |
1719 | int i; | |
1720 | struct list_head *tmp; | |
1721 | mdk_rdev_t *rdev, *freshest; | |
1722 | char b[BDEVNAME_SIZE]; | |
1723 | ||
1724 | freshest = NULL; | |
1725 | ITERATE_RDEV(mddev,rdev,tmp) | |
1726 | switch (super_types[mddev->major_version]. | |
1727 | load_super(rdev, freshest, mddev->minor_version)) { | |
1728 | case 1: | |
1729 | freshest = rdev; | |
1730 | break; | |
1731 | case 0: | |
1732 | break; | |
1733 | default: | |
1734 | printk( KERN_ERR \ | |
1735 | "md: fatal superblock inconsistency in %s" | |
1736 | " -- removing from array\n", | |
1737 | bdevname(rdev->bdev,b)); | |
1738 | kick_rdev_from_array(rdev); | |
1739 | } | |
1740 | ||
1741 | ||
1742 | super_types[mddev->major_version]. | |
1743 | validate_super(mddev, freshest); | |
1744 | ||
1745 | i = 0; | |
1746 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1747 | if (rdev != freshest) | |
1748 | if (super_types[mddev->major_version]. | |
1749 | validate_super(mddev, rdev)) { | |
1750 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
1751 | " from array!\n", | |
1752 | bdevname(rdev->bdev,b)); | |
1753 | kick_rdev_from_array(rdev); | |
1754 | continue; | |
1755 | } | |
1756 | if (mddev->level == LEVEL_MULTIPATH) { | |
1757 | rdev->desc_nr = i++; | |
1758 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 1759 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1760 | } |
1761 | } | |
1762 | ||
1763 | ||
1764 | ||
1765 | if (mddev->recovery_cp != MaxSector && | |
1766 | mddev->level >= 1) | |
1767 | printk(KERN_ERR "md: %s: raid array is not clean" | |
1768 | " -- starting background reconstruction\n", | |
1769 | mdname(mddev)); | |
1770 | ||
1da177e4 LT |
1771 | } |
1772 | ||
eae1701f | 1773 | static ssize_t |
96de1e66 | 1774 | level_show(mddev_t *mddev, char *page) |
eae1701f | 1775 | { |
2604b703 | 1776 | struct mdk_personality *p = mddev->pers; |
bb636547 | 1777 | if (p == NULL && mddev->raid_disks == 0) |
eae1701f N |
1778 | return 0; |
1779 | if (mddev->level >= 0) | |
bcb97940 | 1780 | return sprintf(page, "raid%d\n", mddev->level); |
eae1701f N |
1781 | else |
1782 | return sprintf(page, "%s\n", p->name); | |
1783 | } | |
1784 | ||
96de1e66 | 1785 | static struct md_sysfs_entry md_level = __ATTR_RO(level); |
eae1701f N |
1786 | |
1787 | static ssize_t | |
96de1e66 | 1788 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 1789 | { |
bb636547 N |
1790 | if (mddev->raid_disks == 0) |
1791 | return 0; | |
eae1701f N |
1792 | return sprintf(page, "%d\n", mddev->raid_disks); |
1793 | } | |
1794 | ||
96de1e66 | 1795 | static struct md_sysfs_entry md_raid_disks = __ATTR_RO(raid_disks); |
eae1701f | 1796 | |
24dd469d | 1797 | static ssize_t |
7eec314d | 1798 | action_show(mddev_t *mddev, char *page) |
24dd469d | 1799 | { |
7eec314d | 1800 | char *type = "idle"; |
31399d9e N |
1801 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
1802 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { | |
1803 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
1804 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
1805 | type = "resync"; | |
1806 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
1807 | type = "check"; | |
1808 | else | |
1809 | type = "repair"; | |
1810 | } else | |
1811 | type = "recover"; | |
1812 | } | |
1813 | return sprintf(page, "%s\n", type); | |
1814 | } | |
1815 | ||
1816 | static ssize_t | |
7eec314d | 1817 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 1818 | { |
7eec314d N |
1819 | if (!mddev->pers || !mddev->pers->sync_request) |
1820 | return -EINVAL; | |
1821 | ||
bce74dac | 1822 | if (cmd_match(page, "idle")) { |
7eec314d N |
1823 | if (mddev->sync_thread) { |
1824 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
1825 | md_unregister_thread(mddev->sync_thread); | |
1826 | mddev->sync_thread = NULL; | |
1827 | mddev->recovery = 0; | |
1828 | } | |
1829 | return len; | |
1830 | } | |
31399d9e N |
1831 | |
1832 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1833 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 1834 | return -EBUSY; |
bce74dac | 1835 | if (cmd_match(page, "resync") || cmd_match(page, "recover")) |
7eec314d N |
1836 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
1837 | else { | |
bce74dac | 1838 | if (cmd_match(page, "check")) |
7eec314d | 1839 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
bce74dac | 1840 | else if (cmd_match(page, "repair")) |
7eec314d N |
1841 | return -EINVAL; |
1842 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
1843 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
1844 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1845 | } | |
24dd469d N |
1846 | md_wakeup_thread(mddev->thread); |
1847 | return len; | |
1848 | } | |
1849 | ||
9d88883e | 1850 | static ssize_t |
96de1e66 | 1851 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
1852 | { |
1853 | return sprintf(page, "%llu\n", | |
1854 | (unsigned long long) mddev->resync_mismatches); | |
1855 | } | |
1856 | ||
96de1e66 | 1857 | static struct md_sysfs_entry |
7eec314d | 1858 | md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
24dd469d | 1859 | |
96de1e66 N |
1860 | |
1861 | static struct md_sysfs_entry | |
1862 | md_mismatches = __ATTR_RO(mismatch_cnt); | |
9d88883e | 1863 | |
eae1701f N |
1864 | static struct attribute *md_default_attrs[] = { |
1865 | &md_level.attr, | |
1866 | &md_raid_disks.attr, | |
411036fa N |
1867 | NULL, |
1868 | }; | |
1869 | ||
1870 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 1871 | &md_scan_mode.attr, |
9d88883e | 1872 | &md_mismatches.attr, |
eae1701f N |
1873 | NULL, |
1874 | }; | |
411036fa N |
1875 | static struct attribute_group md_redundancy_group = { |
1876 | .name = NULL, | |
1877 | .attrs = md_redundancy_attrs, | |
1878 | }; | |
1879 | ||
eae1701f N |
1880 | |
1881 | static ssize_t | |
1882 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1883 | { | |
1884 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
1885 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 1886 | ssize_t rv; |
eae1701f N |
1887 | |
1888 | if (!entry->show) | |
1889 | return -EIO; | |
96de1e66 N |
1890 | mddev_lock(mddev); |
1891 | rv = entry->show(mddev, page); | |
1892 | mddev_unlock(mddev); | |
1893 | return rv; | |
eae1701f N |
1894 | } |
1895 | ||
1896 | static ssize_t | |
1897 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
1898 | const char *page, size_t length) | |
1899 | { | |
1900 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
1901 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 1902 | ssize_t rv; |
eae1701f N |
1903 | |
1904 | if (!entry->store) | |
1905 | return -EIO; | |
96de1e66 N |
1906 | mddev_lock(mddev); |
1907 | rv = entry->store(mddev, page, length); | |
1908 | mddev_unlock(mddev); | |
1909 | return rv; | |
eae1701f N |
1910 | } |
1911 | ||
1912 | static void md_free(struct kobject *ko) | |
1913 | { | |
1914 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
1915 | kfree(mddev); | |
1916 | } | |
1917 | ||
1918 | static struct sysfs_ops md_sysfs_ops = { | |
1919 | .show = md_attr_show, | |
1920 | .store = md_attr_store, | |
1921 | }; | |
1922 | static struct kobj_type md_ktype = { | |
1923 | .release = md_free, | |
1924 | .sysfs_ops = &md_sysfs_ops, | |
1925 | .default_attrs = md_default_attrs, | |
1926 | }; | |
1927 | ||
1da177e4 LT |
1928 | int mdp_major = 0; |
1929 | ||
1930 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
1931 | { | |
1932 | static DECLARE_MUTEX(disks_sem); | |
1933 | mddev_t *mddev = mddev_find(dev); | |
1934 | struct gendisk *disk; | |
1935 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
1936 | int shift = partitioned ? MdpMinorShift : 0; | |
1937 | int unit = MINOR(dev) >> shift; | |
1938 | ||
1939 | if (!mddev) | |
1940 | return NULL; | |
1941 | ||
1942 | down(&disks_sem); | |
1943 | if (mddev->gendisk) { | |
1944 | up(&disks_sem); | |
1945 | mddev_put(mddev); | |
1946 | return NULL; | |
1947 | } | |
1948 | disk = alloc_disk(1 << shift); | |
1949 | if (!disk) { | |
1950 | up(&disks_sem); | |
1951 | mddev_put(mddev); | |
1952 | return NULL; | |
1953 | } | |
1954 | disk->major = MAJOR(dev); | |
1955 | disk->first_minor = unit << shift; | |
1956 | if (partitioned) { | |
1957 | sprintf(disk->disk_name, "md_d%d", unit); | |
1958 | sprintf(disk->devfs_name, "md/d%d", unit); | |
1959 | } else { | |
1960 | sprintf(disk->disk_name, "md%d", unit); | |
1961 | sprintf(disk->devfs_name, "md/%d", unit); | |
1962 | } | |
1963 | disk->fops = &md_fops; | |
1964 | disk->private_data = mddev; | |
1965 | disk->queue = mddev->queue; | |
1966 | add_disk(disk); | |
1967 | mddev->gendisk = disk; | |
1968 | up(&disks_sem); | |
9c791977 | 1969 | mddev->kobj.parent = &disk->kobj; |
eae1701f N |
1970 | mddev->kobj.k_name = NULL; |
1971 | snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); | |
1972 | mddev->kobj.ktype = &md_ktype; | |
1973 | kobject_register(&mddev->kobj); | |
1da177e4 LT |
1974 | return NULL; |
1975 | } | |
1976 | ||
1977 | void md_wakeup_thread(mdk_thread_t *thread); | |
1978 | ||
1979 | static void md_safemode_timeout(unsigned long data) | |
1980 | { | |
1981 | mddev_t *mddev = (mddev_t *) data; | |
1982 | ||
1983 | mddev->safemode = 1; | |
1984 | md_wakeup_thread(mddev->thread); | |
1985 | } | |
1986 | ||
6ff8d8ec | 1987 | static int start_dirty_degraded; |
1da177e4 LT |
1988 | |
1989 | static int do_md_run(mddev_t * mddev) | |
1990 | { | |
2604b703 | 1991 | int err; |
1da177e4 LT |
1992 | int chunk_size; |
1993 | struct list_head *tmp; | |
1994 | mdk_rdev_t *rdev; | |
1995 | struct gendisk *disk; | |
2604b703 | 1996 | struct mdk_personality *pers; |
1da177e4 LT |
1997 | char b[BDEVNAME_SIZE]; |
1998 | ||
a757e64c N |
1999 | if (list_empty(&mddev->disks)) |
2000 | /* cannot run an array with no devices.. */ | |
1da177e4 | 2001 | return -EINVAL; |
1da177e4 LT |
2002 | |
2003 | if (mddev->pers) | |
2004 | return -EBUSY; | |
2005 | ||
2006 | /* | |
2007 | * Analyze all RAID superblock(s) | |
2008 | */ | |
a757e64c N |
2009 | if (!mddev->raid_disks) |
2010 | analyze_sbs(mddev); | |
1da177e4 LT |
2011 | |
2012 | chunk_size = mddev->chunk_size; | |
2604b703 N |
2013 | |
2014 | if (chunk_size) { | |
1da177e4 LT |
2015 | if (chunk_size > MAX_CHUNK_SIZE) { |
2016 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
2017 | chunk_size, MAX_CHUNK_SIZE); | |
2018 | return -EINVAL; | |
2019 | } | |
2020 | /* | |
2021 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
2022 | */ | |
2023 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 2024 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
2025 | return -EINVAL; |
2026 | } | |
2027 | if (chunk_size < PAGE_SIZE) { | |
2028 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
2029 | chunk_size, PAGE_SIZE); | |
2030 | return -EINVAL; | |
2031 | } | |
2032 | ||
2033 | /* devices must have minimum size of one chunk */ | |
2034 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2035 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2036 | continue; |
2037 | if (rdev->size < chunk_size / 1024) { | |
2038 | printk(KERN_WARNING | |
2039 | "md: Dev %s smaller than chunk_size:" | |
2040 | " %lluk < %dk\n", | |
2041 | bdevname(rdev->bdev,b), | |
2042 | (unsigned long long)rdev->size, | |
2043 | chunk_size / 1024); | |
2044 | return -EINVAL; | |
2045 | } | |
2046 | } | |
2047 | } | |
2048 | ||
1da177e4 | 2049 | #ifdef CONFIG_KMOD |
2604b703 | 2050 | request_module("md-level-%d", mddev->level); |
1da177e4 LT |
2051 | #endif |
2052 | ||
2053 | /* | |
2054 | * Drop all container device buffers, from now on | |
2055 | * the only valid external interface is through the md | |
2056 | * device. | |
2057 | * Also find largest hardsector size | |
2058 | */ | |
2059 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2060 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2061 | continue; |
2062 | sync_blockdev(rdev->bdev); | |
2063 | invalidate_bdev(rdev->bdev, 0); | |
2064 | } | |
2065 | ||
2066 | md_probe(mddev->unit, NULL, NULL); | |
2067 | disk = mddev->gendisk; | |
2068 | if (!disk) | |
2069 | return -ENOMEM; | |
2070 | ||
2071 | spin_lock(&pers_lock); | |
2604b703 N |
2072 | pers = find_pers(mddev->level); |
2073 | if (!pers || !try_module_get(pers->owner)) { | |
1da177e4 | 2074 | spin_unlock(&pers_lock); |
2604b703 N |
2075 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", |
2076 | mddev->level); | |
1da177e4 LT |
2077 | return -EINVAL; |
2078 | } | |
2604b703 | 2079 | mddev->pers = pers; |
1da177e4 LT |
2080 | spin_unlock(&pers_lock); |
2081 | ||
657390d2 | 2082 | mddev->recovery = 0; |
1da177e4 | 2083 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 2084 | mddev->barriers_work = 1; |
6ff8d8ec | 2085 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 2086 | |
f91de92e N |
2087 | if (start_readonly) |
2088 | mddev->ro = 2; /* read-only, but switch on first write */ | |
2089 | ||
b15c2e57 N |
2090 | err = mddev->pers->run(mddev); |
2091 | if (!err && mddev->pers->sync_request) { | |
2092 | err = bitmap_create(mddev); | |
2093 | if (err) { | |
2094 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
2095 | mdname(mddev), err); | |
2096 | mddev->pers->stop(mddev); | |
2097 | } | |
2098 | } | |
1da177e4 LT |
2099 | if (err) { |
2100 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
2101 | module_put(mddev->pers->owner); | |
2102 | mddev->pers = NULL; | |
32a7627c N |
2103 | bitmap_destroy(mddev); |
2104 | return err; | |
1da177e4 | 2105 | } |
411036fa N |
2106 | if (mddev->pers->sync_request) |
2107 | sysfs_create_group(&mddev->kobj, &md_redundancy_group); | |
fd9d49ca N |
2108 | else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
2109 | mddev->ro = 0; | |
2110 | ||
1da177e4 LT |
2111 | atomic_set(&mddev->writes_pending,0); |
2112 | mddev->safemode = 0; | |
2113 | mddev->safemode_timer.function = md_safemode_timeout; | |
2114 | mddev->safemode_timer.data = (unsigned long) mddev; | |
2115 | mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ | |
2116 | mddev->in_sync = 1; | |
86e6ffdd N |
2117 | |
2118 | ITERATE_RDEV(mddev,rdev,tmp) | |
2119 | if (rdev->raid_disk >= 0) { | |
2120 | char nm[20]; | |
2121 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2122 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
2123 | } | |
1da177e4 LT |
2124 | |
2125 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2126 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2127 | |
2128 | if (mddev->sb_dirty) | |
2129 | md_update_sb(mddev); | |
2130 | ||
2131 | set_capacity(disk, mddev->array_size<<1); | |
2132 | ||
2133 | /* If we call blk_queue_make_request here, it will | |
2134 | * re-initialise max_sectors etc which may have been | |
2135 | * refined inside -> run. So just set the bits we need to set. | |
2136 | * Most initialisation happended when we called | |
2137 | * blk_queue_make_request(..., md_fail_request) | |
2138 | * earlier. | |
2139 | */ | |
2140 | mddev->queue->queuedata = mddev; | |
2141 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
2142 | ||
2143 | mddev->changed = 1; | |
d7603b7e | 2144 | md_new_event(mddev); |
1da177e4 LT |
2145 | return 0; |
2146 | } | |
2147 | ||
2148 | static int restart_array(mddev_t *mddev) | |
2149 | { | |
2150 | struct gendisk *disk = mddev->gendisk; | |
2151 | int err; | |
2152 | ||
2153 | /* | |
2154 | * Complain if it has no devices | |
2155 | */ | |
2156 | err = -ENXIO; | |
2157 | if (list_empty(&mddev->disks)) | |
2158 | goto out; | |
2159 | ||
2160 | if (mddev->pers) { | |
2161 | err = -EBUSY; | |
2162 | if (!mddev->ro) | |
2163 | goto out; | |
2164 | ||
2165 | mddev->safemode = 0; | |
2166 | mddev->ro = 0; | |
2167 | set_disk_ro(disk, 0); | |
2168 | ||
2169 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
2170 | mdname(mddev)); | |
2171 | /* | |
2172 | * Kick recovery or resync if necessary | |
2173 | */ | |
2174 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2175 | md_wakeup_thread(mddev->thread); | |
2176 | err = 0; | |
2177 | } else { | |
2178 | printk(KERN_ERR "md: %s has no personality assigned.\n", | |
2179 | mdname(mddev)); | |
2180 | err = -EINVAL; | |
2181 | } | |
2182 | ||
2183 | out: | |
2184 | return err; | |
2185 | } | |
2186 | ||
2187 | static int do_md_stop(mddev_t * mddev, int ro) | |
2188 | { | |
2189 | int err = 0; | |
2190 | struct gendisk *disk = mddev->gendisk; | |
2191 | ||
2192 | if (mddev->pers) { | |
2193 | if (atomic_read(&mddev->active)>2) { | |
2194 | printk("md: %s still in use.\n",mdname(mddev)); | |
2195 | return -EBUSY; | |
2196 | } | |
2197 | ||
2198 | if (mddev->sync_thread) { | |
2199 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2200 | md_unregister_thread(mddev->sync_thread); | |
2201 | mddev->sync_thread = NULL; | |
2202 | } | |
2203 | ||
2204 | del_timer_sync(&mddev->safemode_timer); | |
2205 | ||
2206 | invalidate_partition(disk, 0); | |
2207 | ||
2208 | if (ro) { | |
2209 | err = -ENXIO; | |
f91de92e | 2210 | if (mddev->ro==1) |
1da177e4 LT |
2211 | goto out; |
2212 | mddev->ro = 1; | |
2213 | } else { | |
6b8b3e8a | 2214 | bitmap_flush(mddev); |
a9701a30 | 2215 | md_super_wait(mddev); |
1da177e4 LT |
2216 | if (mddev->ro) |
2217 | set_disk_ro(disk, 0); | |
2218 | blk_queue_make_request(mddev->queue, md_fail_request); | |
2219 | mddev->pers->stop(mddev); | |
411036fa N |
2220 | if (mddev->pers->sync_request) |
2221 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
2222 | ||
1da177e4 LT |
2223 | module_put(mddev->pers->owner); |
2224 | mddev->pers = NULL; | |
2225 | if (mddev->ro) | |
2226 | mddev->ro = 0; | |
2227 | } | |
2228 | if (!mddev->in_sync) { | |
2229 | /* mark array as shutdown cleanly */ | |
2230 | mddev->in_sync = 1; | |
2231 | md_update_sb(mddev); | |
2232 | } | |
2233 | if (ro) | |
2234 | set_disk_ro(disk, 1); | |
2235 | } | |
32a7627c N |
2236 | |
2237 | bitmap_destroy(mddev); | |
2238 | if (mddev->bitmap_file) { | |
2239 | atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1); | |
2240 | fput(mddev->bitmap_file); | |
2241 | mddev->bitmap_file = NULL; | |
2242 | } | |
9223214e | 2243 | mddev->bitmap_offset = 0; |
32a7627c | 2244 | |
1da177e4 LT |
2245 | /* |
2246 | * Free resources if final stop | |
2247 | */ | |
2248 | if (!ro) { | |
86e6ffdd N |
2249 | mdk_rdev_t *rdev; |
2250 | struct list_head *tmp; | |
1da177e4 LT |
2251 | struct gendisk *disk; |
2252 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); | |
2253 | ||
86e6ffdd N |
2254 | ITERATE_RDEV(mddev,rdev,tmp) |
2255 | if (rdev->raid_disk >= 0) { | |
2256 | char nm[20]; | |
2257 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2258 | sysfs_remove_link(&mddev->kobj, nm); | |
2259 | } | |
2260 | ||
1da177e4 LT |
2261 | export_array(mddev); |
2262 | ||
2263 | mddev->array_size = 0; | |
2264 | disk = mddev->gendisk; | |
2265 | if (disk) | |
2266 | set_capacity(disk, 0); | |
2267 | mddev->changed = 1; | |
2268 | } else | |
2269 | printk(KERN_INFO "md: %s switched to read-only mode.\n", | |
2270 | mdname(mddev)); | |
2271 | err = 0; | |
d7603b7e | 2272 | md_new_event(mddev); |
1da177e4 LT |
2273 | out: |
2274 | return err; | |
2275 | } | |
2276 | ||
2277 | static void autorun_array(mddev_t *mddev) | |
2278 | { | |
2279 | mdk_rdev_t *rdev; | |
2280 | struct list_head *tmp; | |
2281 | int err; | |
2282 | ||
a757e64c | 2283 | if (list_empty(&mddev->disks)) |
1da177e4 | 2284 | return; |
1da177e4 LT |
2285 | |
2286 | printk(KERN_INFO "md: running: "); | |
2287 | ||
2288 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2289 | char b[BDEVNAME_SIZE]; | |
2290 | printk("<%s>", bdevname(rdev->bdev,b)); | |
2291 | } | |
2292 | printk("\n"); | |
2293 | ||
2294 | err = do_md_run (mddev); | |
2295 | if (err) { | |
2296 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
2297 | do_md_stop (mddev, 0); | |
2298 | } | |
2299 | } | |
2300 | ||
2301 | /* | |
2302 | * lets try to run arrays based on all disks that have arrived | |
2303 | * until now. (those are in pending_raid_disks) | |
2304 | * | |
2305 | * the method: pick the first pending disk, collect all disks with | |
2306 | * the same UUID, remove all from the pending list and put them into | |
2307 | * the 'same_array' list. Then order this list based on superblock | |
2308 | * update time (freshest comes first), kick out 'old' disks and | |
2309 | * compare superblocks. If everything's fine then run it. | |
2310 | * | |
2311 | * If "unit" is allocated, then bump its reference count | |
2312 | */ | |
2313 | static void autorun_devices(int part) | |
2314 | { | |
2315 | struct list_head candidates; | |
2316 | struct list_head *tmp; | |
2317 | mdk_rdev_t *rdev0, *rdev; | |
2318 | mddev_t *mddev; | |
2319 | char b[BDEVNAME_SIZE]; | |
2320 | ||
2321 | printk(KERN_INFO "md: autorun ...\n"); | |
2322 | while (!list_empty(&pending_raid_disks)) { | |
2323 | dev_t dev; | |
2324 | rdev0 = list_entry(pending_raid_disks.next, | |
2325 | mdk_rdev_t, same_set); | |
2326 | ||
2327 | printk(KERN_INFO "md: considering %s ...\n", | |
2328 | bdevname(rdev0->bdev,b)); | |
2329 | INIT_LIST_HEAD(&candidates); | |
2330 | ITERATE_RDEV_PENDING(rdev,tmp) | |
2331 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
2332 | printk(KERN_INFO "md: adding %s ...\n", | |
2333 | bdevname(rdev->bdev,b)); | |
2334 | list_move(&rdev->same_set, &candidates); | |
2335 | } | |
2336 | /* | |
2337 | * now we have a set of devices, with all of them having | |
2338 | * mostly sane superblocks. It's time to allocate the | |
2339 | * mddev. | |
2340 | */ | |
2341 | if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { | |
2342 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", | |
2343 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
2344 | break; | |
2345 | } | |
2346 | if (part) | |
2347 | dev = MKDEV(mdp_major, | |
2348 | rdev0->preferred_minor << MdpMinorShift); | |
2349 | else | |
2350 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
2351 | ||
2352 | md_probe(dev, NULL, NULL); | |
2353 | mddev = mddev_find(dev); | |
2354 | if (!mddev) { | |
2355 | printk(KERN_ERR | |
2356 | "md: cannot allocate memory for md drive.\n"); | |
2357 | break; | |
2358 | } | |
2359 | if (mddev_lock(mddev)) | |
2360 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
2361 | mdname(mddev)); | |
2362 | else if (mddev->raid_disks || mddev->major_version | |
2363 | || !list_empty(&mddev->disks)) { | |
2364 | printk(KERN_WARNING | |
2365 | "md: %s already running, cannot run %s\n", | |
2366 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
2367 | mddev_unlock(mddev); | |
2368 | } else { | |
2369 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
2370 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { | |
2371 | list_del_init(&rdev->same_set); | |
2372 | if (bind_rdev_to_array(rdev, mddev)) | |
2373 | export_rdev(rdev); | |
2374 | } | |
2375 | autorun_array(mddev); | |
2376 | mddev_unlock(mddev); | |
2377 | } | |
2378 | /* on success, candidates will be empty, on error | |
2379 | * it won't... | |
2380 | */ | |
2381 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) | |
2382 | export_rdev(rdev); | |
2383 | mddev_put(mddev); | |
2384 | } | |
2385 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
2386 | } | |
2387 | ||
2388 | /* | |
2389 | * import RAID devices based on one partition | |
2390 | * if possible, the array gets run as well. | |
2391 | */ | |
2392 | ||
2393 | static int autostart_array(dev_t startdev) | |
2394 | { | |
2395 | char b[BDEVNAME_SIZE]; | |
2396 | int err = -EINVAL, i; | |
2397 | mdp_super_t *sb = NULL; | |
2398 | mdk_rdev_t *start_rdev = NULL, *rdev; | |
2399 | ||
2400 | start_rdev = md_import_device(startdev, 0, 0); | |
2401 | if (IS_ERR(start_rdev)) | |
2402 | return err; | |
2403 | ||
2404 | ||
2405 | /* NOTE: this can only work for 0.90.0 superblocks */ | |
2406 | sb = (mdp_super_t*)page_address(start_rdev->sb_page); | |
2407 | if (sb->major_version != 0 || | |
2408 | sb->minor_version != 90 ) { | |
2409 | printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); | |
2410 | export_rdev(start_rdev); | |
2411 | return err; | |
2412 | } | |
2413 | ||
b2d444d7 | 2414 | if (test_bit(Faulty, &start_rdev->flags)) { |
1da177e4 LT |
2415 | printk(KERN_WARNING |
2416 | "md: can not autostart based on faulty %s!\n", | |
2417 | bdevname(start_rdev->bdev,b)); | |
2418 | export_rdev(start_rdev); | |
2419 | return err; | |
2420 | } | |
2421 | list_add(&start_rdev->same_set, &pending_raid_disks); | |
2422 | ||
2423 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2424 | mdp_disk_t *desc = sb->disks + i; | |
2425 | dev_t dev = MKDEV(desc->major, desc->minor); | |
2426 | ||
2427 | if (!dev) | |
2428 | continue; | |
2429 | if (dev == startdev) | |
2430 | continue; | |
2431 | if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) | |
2432 | continue; | |
2433 | rdev = md_import_device(dev, 0, 0); | |
2434 | if (IS_ERR(rdev)) | |
2435 | continue; | |
2436 | ||
2437 | list_add(&rdev->same_set, &pending_raid_disks); | |
2438 | } | |
2439 | ||
2440 | /* | |
2441 | * possibly return codes | |
2442 | */ | |
2443 | autorun_devices(0); | |
2444 | return 0; | |
2445 | ||
2446 | } | |
2447 | ||
2448 | ||
2449 | static int get_version(void __user * arg) | |
2450 | { | |
2451 | mdu_version_t ver; | |
2452 | ||
2453 | ver.major = MD_MAJOR_VERSION; | |
2454 | ver.minor = MD_MINOR_VERSION; | |
2455 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
2456 | ||
2457 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
2458 | return -EFAULT; | |
2459 | ||
2460 | return 0; | |
2461 | } | |
2462 | ||
2463 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
2464 | { | |
2465 | mdu_array_info_t info; | |
2466 | int nr,working,active,failed,spare; | |
2467 | mdk_rdev_t *rdev; | |
2468 | struct list_head *tmp; | |
2469 | ||
2470 | nr=working=active=failed=spare=0; | |
2471 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2472 | nr++; | |
b2d444d7 | 2473 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2474 | failed++; |
2475 | else { | |
2476 | working++; | |
b2d444d7 | 2477 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
2478 | active++; |
2479 | else | |
2480 | spare++; | |
2481 | } | |
2482 | } | |
2483 | ||
2484 | info.major_version = mddev->major_version; | |
2485 | info.minor_version = mddev->minor_version; | |
2486 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
2487 | info.ctime = mddev->ctime; | |
2488 | info.level = mddev->level; | |
2489 | info.size = mddev->size; | |
2490 | info.nr_disks = nr; | |
2491 | info.raid_disks = mddev->raid_disks; | |
2492 | info.md_minor = mddev->md_minor; | |
2493 | info.not_persistent= !mddev->persistent; | |
2494 | ||
2495 | info.utime = mddev->utime; | |
2496 | info.state = 0; | |
2497 | if (mddev->in_sync) | |
2498 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
2499 | if (mddev->bitmap && mddev->bitmap_offset) |
2500 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
2501 | info.active_disks = active; |
2502 | info.working_disks = working; | |
2503 | info.failed_disks = failed; | |
2504 | info.spare_disks = spare; | |
2505 | ||
2506 | info.layout = mddev->layout; | |
2507 | info.chunk_size = mddev->chunk_size; | |
2508 | ||
2509 | if (copy_to_user(arg, &info, sizeof(info))) | |
2510 | return -EFAULT; | |
2511 | ||
2512 | return 0; | |
2513 | } | |
2514 | ||
87162a28 | 2515 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
2516 | { |
2517 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
2518 | char *ptr, *buf = NULL; | |
2519 | int err = -ENOMEM; | |
2520 | ||
2521 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2522 | if (!file) | |
2523 | goto out; | |
2524 | ||
2525 | /* bitmap disabled, zero the first byte and copy out */ | |
2526 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
2527 | file->pathname[0] = '\0'; | |
2528 | goto copy_out; | |
2529 | } | |
2530 | ||
2531 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
2532 | if (!buf) | |
2533 | goto out; | |
2534 | ||
2535 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
2536 | if (!ptr) | |
2537 | goto out; | |
2538 | ||
2539 | strcpy(file->pathname, ptr); | |
2540 | ||
2541 | copy_out: | |
2542 | err = 0; | |
2543 | if (copy_to_user(arg, file, sizeof(*file))) | |
2544 | err = -EFAULT; | |
2545 | out: | |
2546 | kfree(buf); | |
2547 | kfree(file); | |
2548 | return err; | |
2549 | } | |
2550 | ||
1da177e4 LT |
2551 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
2552 | { | |
2553 | mdu_disk_info_t info; | |
2554 | unsigned int nr; | |
2555 | mdk_rdev_t *rdev; | |
2556 | ||
2557 | if (copy_from_user(&info, arg, sizeof(info))) | |
2558 | return -EFAULT; | |
2559 | ||
2560 | nr = info.number; | |
2561 | ||
2562 | rdev = find_rdev_nr(mddev, nr); | |
2563 | if (rdev) { | |
2564 | info.major = MAJOR(rdev->bdev->bd_dev); | |
2565 | info.minor = MINOR(rdev->bdev->bd_dev); | |
2566 | info.raid_disk = rdev->raid_disk; | |
2567 | info.state = 0; | |
b2d444d7 | 2568 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 2569 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 2570 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2571 | info.state |= (1<<MD_DISK_ACTIVE); |
2572 | info.state |= (1<<MD_DISK_SYNC); | |
2573 | } | |
8ddf9efe N |
2574 | if (test_bit(WriteMostly, &rdev->flags)) |
2575 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
2576 | } else { |
2577 | info.major = info.minor = 0; | |
2578 | info.raid_disk = -1; | |
2579 | info.state = (1<<MD_DISK_REMOVED); | |
2580 | } | |
2581 | ||
2582 | if (copy_to_user(arg, &info, sizeof(info))) | |
2583 | return -EFAULT; | |
2584 | ||
2585 | return 0; | |
2586 | } | |
2587 | ||
2588 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
2589 | { | |
2590 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
2591 | mdk_rdev_t *rdev; | |
2592 | dev_t dev = MKDEV(info->major,info->minor); | |
2593 | ||
2594 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
2595 | return -EOVERFLOW; | |
2596 | ||
2597 | if (!mddev->raid_disks) { | |
2598 | int err; | |
2599 | /* expecting a device which has a superblock */ | |
2600 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
2601 | if (IS_ERR(rdev)) { | |
2602 | printk(KERN_WARNING | |
2603 | "md: md_import_device returned %ld\n", | |
2604 | PTR_ERR(rdev)); | |
2605 | return PTR_ERR(rdev); | |
2606 | } | |
2607 | if (!list_empty(&mddev->disks)) { | |
2608 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2609 | mdk_rdev_t, same_set); | |
2610 | int err = super_types[mddev->major_version] | |
2611 | .load_super(rdev, rdev0, mddev->minor_version); | |
2612 | if (err < 0) { | |
2613 | printk(KERN_WARNING | |
2614 | "md: %s has different UUID to %s\n", | |
2615 | bdevname(rdev->bdev,b), | |
2616 | bdevname(rdev0->bdev,b2)); | |
2617 | export_rdev(rdev); | |
2618 | return -EINVAL; | |
2619 | } | |
2620 | } | |
2621 | err = bind_rdev_to_array(rdev, mddev); | |
2622 | if (err) | |
2623 | export_rdev(rdev); | |
2624 | return err; | |
2625 | } | |
2626 | ||
2627 | /* | |
2628 | * add_new_disk can be used once the array is assembled | |
2629 | * to add "hot spares". They must already have a superblock | |
2630 | * written | |
2631 | */ | |
2632 | if (mddev->pers) { | |
2633 | int err; | |
2634 | if (!mddev->pers->hot_add_disk) { | |
2635 | printk(KERN_WARNING | |
2636 | "%s: personality does not support diskops!\n", | |
2637 | mdname(mddev)); | |
2638 | return -EINVAL; | |
2639 | } | |
7b1e35f6 N |
2640 | if (mddev->persistent) |
2641 | rdev = md_import_device(dev, mddev->major_version, | |
2642 | mddev->minor_version); | |
2643 | else | |
2644 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
2645 | if (IS_ERR(rdev)) { |
2646 | printk(KERN_WARNING | |
2647 | "md: md_import_device returned %ld\n", | |
2648 | PTR_ERR(rdev)); | |
2649 | return PTR_ERR(rdev); | |
2650 | } | |
41158c7e N |
2651 | /* set save_raid_disk if appropriate */ |
2652 | if (!mddev->persistent) { | |
2653 | if (info->state & (1<<MD_DISK_SYNC) && | |
2654 | info->raid_disk < mddev->raid_disks) | |
2655 | rdev->raid_disk = info->raid_disk; | |
2656 | else | |
2657 | rdev->raid_disk = -1; | |
2658 | } else | |
2659 | super_types[mddev->major_version]. | |
2660 | validate_super(mddev, rdev); | |
2661 | rdev->saved_raid_disk = rdev->raid_disk; | |
2662 | ||
b2d444d7 | 2663 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
2664 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
2665 | set_bit(WriteMostly, &rdev->flags); | |
2666 | ||
1da177e4 LT |
2667 | rdev->raid_disk = -1; |
2668 | err = bind_rdev_to_array(rdev, mddev); | |
2669 | if (err) | |
2670 | export_rdev(rdev); | |
c361777f N |
2671 | |
2672 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2673 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2674 | return err; |
2675 | } | |
2676 | ||
2677 | /* otherwise, add_new_disk is only allowed | |
2678 | * for major_version==0 superblocks | |
2679 | */ | |
2680 | if (mddev->major_version != 0) { | |
2681 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
2682 | mdname(mddev)); | |
2683 | return -EINVAL; | |
2684 | } | |
2685 | ||
2686 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
2687 | int err; | |
2688 | rdev = md_import_device (dev, -1, 0); | |
2689 | if (IS_ERR(rdev)) { | |
2690 | printk(KERN_WARNING | |
2691 | "md: error, md_import_device() returned %ld\n", | |
2692 | PTR_ERR(rdev)); | |
2693 | return PTR_ERR(rdev); | |
2694 | } | |
2695 | rdev->desc_nr = info->number; | |
2696 | if (info->raid_disk < mddev->raid_disks) | |
2697 | rdev->raid_disk = info->raid_disk; | |
2698 | else | |
2699 | rdev->raid_disk = -1; | |
2700 | ||
b2d444d7 N |
2701 | rdev->flags = 0; |
2702 | ||
1da177e4 | 2703 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
2704 | if (info->state & (1<<MD_DISK_SYNC)) |
2705 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 2706 | |
8ddf9efe N |
2707 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
2708 | set_bit(WriteMostly, &rdev->flags); | |
2709 | ||
1da177e4 LT |
2710 | err = bind_rdev_to_array(rdev, mddev); |
2711 | if (err) { | |
2712 | export_rdev(rdev); | |
2713 | return err; | |
2714 | } | |
2715 | ||
2716 | if (!mddev->persistent) { | |
2717 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
2718 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2719 | } else | |
2720 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
2721 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
2722 | ||
2723 | if (!mddev->size || (mddev->size > rdev->size)) | |
2724 | mddev->size = rdev->size; | |
2725 | } | |
2726 | ||
2727 | return 0; | |
2728 | } | |
2729 | ||
2730 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
2731 | { | |
2732 | char b[BDEVNAME_SIZE]; | |
2733 | mdk_rdev_t *rdev; | |
2734 | ||
2735 | if (!mddev->pers) | |
2736 | return -ENODEV; | |
2737 | ||
2738 | rdev = find_rdev(mddev, dev); | |
2739 | if (!rdev) | |
2740 | return -ENXIO; | |
2741 | ||
2742 | if (rdev->raid_disk >= 0) | |
2743 | goto busy; | |
2744 | ||
2745 | kick_rdev_from_array(rdev); | |
2746 | md_update_sb(mddev); | |
d7603b7e | 2747 | md_new_event(mddev); |
1da177e4 LT |
2748 | |
2749 | return 0; | |
2750 | busy: | |
2751 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", | |
2752 | bdevname(rdev->bdev,b), mdname(mddev)); | |
2753 | return -EBUSY; | |
2754 | } | |
2755 | ||
2756 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
2757 | { | |
2758 | char b[BDEVNAME_SIZE]; | |
2759 | int err; | |
2760 | unsigned int size; | |
2761 | mdk_rdev_t *rdev; | |
2762 | ||
2763 | if (!mddev->pers) | |
2764 | return -ENODEV; | |
2765 | ||
2766 | if (mddev->major_version != 0) { | |
2767 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
2768 | " version-0 superblocks.\n", | |
2769 | mdname(mddev)); | |
2770 | return -EINVAL; | |
2771 | } | |
2772 | if (!mddev->pers->hot_add_disk) { | |
2773 | printk(KERN_WARNING | |
2774 | "%s: personality does not support diskops!\n", | |
2775 | mdname(mddev)); | |
2776 | return -EINVAL; | |
2777 | } | |
2778 | ||
2779 | rdev = md_import_device (dev, -1, 0); | |
2780 | if (IS_ERR(rdev)) { | |
2781 | printk(KERN_WARNING | |
2782 | "md: error, md_import_device() returned %ld\n", | |
2783 | PTR_ERR(rdev)); | |
2784 | return -EINVAL; | |
2785 | } | |
2786 | ||
2787 | if (mddev->persistent) | |
2788 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
2789 | else | |
2790 | rdev->sb_offset = | |
2791 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2792 | ||
2793 | size = calc_dev_size(rdev, mddev->chunk_size); | |
2794 | rdev->size = size; | |
2795 | ||
2796 | if (size < mddev->size) { | |
2797 | printk(KERN_WARNING | |
2798 | "%s: disk size %llu blocks < array size %llu\n", | |
2799 | mdname(mddev), (unsigned long long)size, | |
2800 | (unsigned long long)mddev->size); | |
2801 | err = -ENOSPC; | |
2802 | goto abort_export; | |
2803 | } | |
2804 | ||
b2d444d7 | 2805 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
2806 | printk(KERN_WARNING |
2807 | "md: can not hot-add faulty %s disk to %s!\n", | |
2808 | bdevname(rdev->bdev,b), mdname(mddev)); | |
2809 | err = -EINVAL; | |
2810 | goto abort_export; | |
2811 | } | |
b2d444d7 | 2812 | clear_bit(In_sync, &rdev->flags); |
1da177e4 LT |
2813 | rdev->desc_nr = -1; |
2814 | bind_rdev_to_array(rdev, mddev); | |
2815 | ||
2816 | /* | |
2817 | * The rest should better be atomic, we can have disk failures | |
2818 | * noticed in interrupt contexts ... | |
2819 | */ | |
2820 | ||
2821 | if (rdev->desc_nr == mddev->max_disks) { | |
2822 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
2823 | mdname(mddev)); | |
2824 | err = -EBUSY; | |
2825 | goto abort_unbind_export; | |
2826 | } | |
2827 | ||
2828 | rdev->raid_disk = -1; | |
2829 | ||
2830 | md_update_sb(mddev); | |
2831 | ||
2832 | /* | |
2833 | * Kick recovery, maybe this spare has to be added to the | |
2834 | * array immediately. | |
2835 | */ | |
2836 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2837 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 2838 | md_new_event(mddev); |
1da177e4 LT |
2839 | return 0; |
2840 | ||
2841 | abort_unbind_export: | |
2842 | unbind_rdev_from_array(rdev); | |
2843 | ||
2844 | abort_export: | |
2845 | export_rdev(rdev); | |
2846 | return err; | |
2847 | } | |
2848 | ||
32a7627c N |
2849 | /* similar to deny_write_access, but accounts for our holding a reference |
2850 | * to the file ourselves */ | |
2851 | static int deny_bitmap_write_access(struct file * file) | |
2852 | { | |
2853 | struct inode *inode = file->f_mapping->host; | |
2854 | ||
2855 | spin_lock(&inode->i_lock); | |
2856 | if (atomic_read(&inode->i_writecount) > 1) { | |
2857 | spin_unlock(&inode->i_lock); | |
2858 | return -ETXTBSY; | |
2859 | } | |
2860 | atomic_set(&inode->i_writecount, -1); | |
2861 | spin_unlock(&inode->i_lock); | |
2862 | ||
2863 | return 0; | |
2864 | } | |
2865 | ||
2866 | static int set_bitmap_file(mddev_t *mddev, int fd) | |
2867 | { | |
2868 | int err; | |
2869 | ||
36fa3063 N |
2870 | if (mddev->pers) { |
2871 | if (!mddev->pers->quiesce) | |
2872 | return -EBUSY; | |
2873 | if (mddev->recovery || mddev->sync_thread) | |
2874 | return -EBUSY; | |
2875 | /* we should be able to change the bitmap.. */ | |
2876 | } | |
32a7627c | 2877 | |
32a7627c | 2878 | |
36fa3063 N |
2879 | if (fd >= 0) { |
2880 | if (mddev->bitmap) | |
2881 | return -EEXIST; /* cannot add when bitmap is present */ | |
2882 | mddev->bitmap_file = fget(fd); | |
32a7627c | 2883 | |
36fa3063 N |
2884 | if (mddev->bitmap_file == NULL) { |
2885 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
2886 | mdname(mddev)); | |
2887 | return -EBADF; | |
2888 | } | |
2889 | ||
2890 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
2891 | if (err) { | |
2892 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
2893 | mdname(mddev)); | |
2894 | fput(mddev->bitmap_file); | |
2895 | mddev->bitmap_file = NULL; | |
2896 | return err; | |
2897 | } | |
a654b9d8 | 2898 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
2899 | } else if (mddev->bitmap == NULL) |
2900 | return -ENOENT; /* cannot remove what isn't there */ | |
2901 | err = 0; | |
2902 | if (mddev->pers) { | |
2903 | mddev->pers->quiesce(mddev, 1); | |
2904 | if (fd >= 0) | |
2905 | err = bitmap_create(mddev); | |
2906 | if (fd < 0 || err) | |
2907 | bitmap_destroy(mddev); | |
2908 | mddev->pers->quiesce(mddev, 0); | |
2909 | } else if (fd < 0) { | |
2910 | if (mddev->bitmap_file) | |
2911 | fput(mddev->bitmap_file); | |
2912 | mddev->bitmap_file = NULL; | |
2913 | } | |
2914 | ||
32a7627c N |
2915 | return err; |
2916 | } | |
2917 | ||
1da177e4 LT |
2918 | /* |
2919 | * set_array_info is used two different ways | |
2920 | * The original usage is when creating a new array. | |
2921 | * In this usage, raid_disks is > 0 and it together with | |
2922 | * level, size, not_persistent,layout,chunksize determine the | |
2923 | * shape of the array. | |
2924 | * This will always create an array with a type-0.90.0 superblock. | |
2925 | * The newer usage is when assembling an array. | |
2926 | * In this case raid_disks will be 0, and the major_version field is | |
2927 | * use to determine which style super-blocks are to be found on the devices. | |
2928 | * The minor and patch _version numbers are also kept incase the | |
2929 | * super_block handler wishes to interpret them. | |
2930 | */ | |
2931 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
2932 | { | |
2933 | ||
2934 | if (info->raid_disks == 0) { | |
2935 | /* just setting version number for superblock loading */ | |
2936 | if (info->major_version < 0 || | |
2937 | info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || | |
2938 | super_types[info->major_version].name == NULL) { | |
2939 | /* maybe try to auto-load a module? */ | |
2940 | printk(KERN_INFO | |
2941 | "md: superblock version %d not known\n", | |
2942 | info->major_version); | |
2943 | return -EINVAL; | |
2944 | } | |
2945 | mddev->major_version = info->major_version; | |
2946 | mddev->minor_version = info->minor_version; | |
2947 | mddev->patch_version = info->patch_version; | |
2948 | return 0; | |
2949 | } | |
2950 | mddev->major_version = MD_MAJOR_VERSION; | |
2951 | mddev->minor_version = MD_MINOR_VERSION; | |
2952 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
2953 | mddev->ctime = get_seconds(); | |
2954 | ||
2955 | mddev->level = info->level; | |
2956 | mddev->size = info->size; | |
2957 | mddev->raid_disks = info->raid_disks; | |
2958 | /* don't set md_minor, it is determined by which /dev/md* was | |
2959 | * openned | |
2960 | */ | |
2961 | if (info->state & (1<<MD_SB_CLEAN)) | |
2962 | mddev->recovery_cp = MaxSector; | |
2963 | else | |
2964 | mddev->recovery_cp = 0; | |
2965 | mddev->persistent = ! info->not_persistent; | |
2966 | ||
2967 | mddev->layout = info->layout; | |
2968 | mddev->chunk_size = info->chunk_size; | |
2969 | ||
2970 | mddev->max_disks = MD_SB_DISKS; | |
2971 | ||
2972 | mddev->sb_dirty = 1; | |
2973 | ||
b2a2703c N |
2974 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
2975 | mddev->bitmap_offset = 0; | |
2976 | ||
1da177e4 LT |
2977 | /* |
2978 | * Generate a 128 bit UUID | |
2979 | */ | |
2980 | get_random_bytes(mddev->uuid, 16); | |
2981 | ||
2982 | return 0; | |
2983 | } | |
2984 | ||
2985 | /* | |
2986 | * update_array_info is used to change the configuration of an | |
2987 | * on-line array. | |
2988 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
2989 | * fields in the info are checked against the array. | |
2990 | * Any differences that cannot be handled will cause an error. | |
2991 | * Normally, only one change can be managed at a time. | |
2992 | */ | |
2993 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
2994 | { | |
2995 | int rv = 0; | |
2996 | int cnt = 0; | |
36fa3063 N |
2997 | int state = 0; |
2998 | ||
2999 | /* calculate expected state,ignoring low bits */ | |
3000 | if (mddev->bitmap && mddev->bitmap_offset) | |
3001 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
3002 | |
3003 | if (mddev->major_version != info->major_version || | |
3004 | mddev->minor_version != info->minor_version || | |
3005 | /* mddev->patch_version != info->patch_version || */ | |
3006 | mddev->ctime != info->ctime || | |
3007 | mddev->level != info->level || | |
3008 | /* mddev->layout != info->layout || */ | |
3009 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
3010 | mddev->chunk_size != info->chunk_size || |
3011 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
3012 | ((state^info->state) & 0xfffffe00) | |
3013 | ) | |
1da177e4 LT |
3014 | return -EINVAL; |
3015 | /* Check there is only one change */ | |
3016 | if (mddev->size != info->size) cnt++; | |
3017 | if (mddev->raid_disks != info->raid_disks) cnt++; | |
3018 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 3019 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
3020 | if (cnt == 0) return 0; |
3021 | if (cnt > 1) return -EINVAL; | |
3022 | ||
3023 | if (mddev->layout != info->layout) { | |
3024 | /* Change layout | |
3025 | * we don't need to do anything at the md level, the | |
3026 | * personality will take care of it all. | |
3027 | */ | |
3028 | if (mddev->pers->reconfig == NULL) | |
3029 | return -EINVAL; | |
3030 | else | |
3031 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
3032 | } | |
3033 | if (mddev->size != info->size) { | |
3034 | mdk_rdev_t * rdev; | |
3035 | struct list_head *tmp; | |
3036 | if (mddev->pers->resize == NULL) | |
3037 | return -EINVAL; | |
3038 | /* The "size" is the amount of each device that is used. | |
3039 | * This can only make sense for arrays with redundancy. | |
3040 | * linear and raid0 always use whatever space is available | |
3041 | * We can only consider changing the size if no resync | |
3042 | * or reconstruction is happening, and if the new size | |
3043 | * is acceptable. It must fit before the sb_offset or, | |
3044 | * if that is <data_offset, it must fit before the | |
3045 | * size of each device. | |
3046 | * If size is zero, we find the largest size that fits. | |
3047 | */ | |
3048 | if (mddev->sync_thread) | |
3049 | return -EBUSY; | |
3050 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3051 | sector_t avail; | |
3052 | int fit = (info->size == 0); | |
3053 | if (rdev->sb_offset > rdev->data_offset) | |
3054 | avail = (rdev->sb_offset*2) - rdev->data_offset; | |
3055 | else | |
3056 | avail = get_capacity(rdev->bdev->bd_disk) | |
3057 | - rdev->data_offset; | |
3058 | if (fit && (info->size == 0 || info->size > avail/2)) | |
3059 | info->size = avail/2; | |
3060 | if (avail < ((sector_t)info->size << 1)) | |
3061 | return -ENOSPC; | |
3062 | } | |
3063 | rv = mddev->pers->resize(mddev, (sector_t)info->size *2); | |
3064 | if (!rv) { | |
3065 | struct block_device *bdev; | |
3066 | ||
3067 | bdev = bdget_disk(mddev->gendisk, 0); | |
3068 | if (bdev) { | |
3069 | down(&bdev->bd_inode->i_sem); | |
3070 | i_size_write(bdev->bd_inode, mddev->array_size << 10); | |
3071 | up(&bdev->bd_inode->i_sem); | |
3072 | bdput(bdev); | |
3073 | } | |
3074 | } | |
3075 | } | |
3076 | if (mddev->raid_disks != info->raid_disks) { | |
3077 | /* change the number of raid disks */ | |
3078 | if (mddev->pers->reshape == NULL) | |
3079 | return -EINVAL; | |
3080 | if (info->raid_disks <= 0 || | |
3081 | info->raid_disks >= mddev->max_disks) | |
3082 | return -EINVAL; | |
3083 | if (mddev->sync_thread) | |
3084 | return -EBUSY; | |
3085 | rv = mddev->pers->reshape(mddev, info->raid_disks); | |
3086 | if (!rv) { | |
3087 | struct block_device *bdev; | |
3088 | ||
3089 | bdev = bdget_disk(mddev->gendisk, 0); | |
3090 | if (bdev) { | |
3091 | down(&bdev->bd_inode->i_sem); | |
3092 | i_size_write(bdev->bd_inode, mddev->array_size << 10); | |
3093 | up(&bdev->bd_inode->i_sem); | |
3094 | bdput(bdev); | |
3095 | } | |
3096 | } | |
3097 | } | |
36fa3063 N |
3098 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
3099 | if (mddev->pers->quiesce == NULL) | |
3100 | return -EINVAL; | |
3101 | if (mddev->recovery || mddev->sync_thread) | |
3102 | return -EBUSY; | |
3103 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
3104 | /* add the bitmap */ | |
3105 | if (mddev->bitmap) | |
3106 | return -EEXIST; | |
3107 | if (mddev->default_bitmap_offset == 0) | |
3108 | return -EINVAL; | |
3109 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
3110 | mddev->pers->quiesce(mddev, 1); | |
3111 | rv = bitmap_create(mddev); | |
3112 | if (rv) | |
3113 | bitmap_destroy(mddev); | |
3114 | mddev->pers->quiesce(mddev, 0); | |
3115 | } else { | |
3116 | /* remove the bitmap */ | |
3117 | if (!mddev->bitmap) | |
3118 | return -ENOENT; | |
3119 | if (mddev->bitmap->file) | |
3120 | return -EINVAL; | |
3121 | mddev->pers->quiesce(mddev, 1); | |
3122 | bitmap_destroy(mddev); | |
3123 | mddev->pers->quiesce(mddev, 0); | |
3124 | mddev->bitmap_offset = 0; | |
3125 | } | |
3126 | } | |
1da177e4 LT |
3127 | md_update_sb(mddev); |
3128 | return rv; | |
3129 | } | |
3130 | ||
3131 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
3132 | { | |
3133 | mdk_rdev_t *rdev; | |
3134 | ||
3135 | if (mddev->pers == NULL) | |
3136 | return -ENODEV; | |
3137 | ||
3138 | rdev = find_rdev(mddev, dev); | |
3139 | if (!rdev) | |
3140 | return -ENODEV; | |
3141 | ||
3142 | md_error(mddev, rdev); | |
3143 | return 0; | |
3144 | } | |
3145 | ||
3146 | static int md_ioctl(struct inode *inode, struct file *file, | |
3147 | unsigned int cmd, unsigned long arg) | |
3148 | { | |
3149 | int err = 0; | |
3150 | void __user *argp = (void __user *)arg; | |
3151 | struct hd_geometry __user *loc = argp; | |
3152 | mddev_t *mddev = NULL; | |
3153 | ||
3154 | if (!capable(CAP_SYS_ADMIN)) | |
3155 | return -EACCES; | |
3156 | ||
3157 | /* | |
3158 | * Commands dealing with the RAID driver but not any | |
3159 | * particular array: | |
3160 | */ | |
3161 | switch (cmd) | |
3162 | { | |
3163 | case RAID_VERSION: | |
3164 | err = get_version(argp); | |
3165 | goto done; | |
3166 | ||
3167 | case PRINT_RAID_DEBUG: | |
3168 | err = 0; | |
3169 | md_print_devices(); | |
3170 | goto done; | |
3171 | ||
3172 | #ifndef MODULE | |
3173 | case RAID_AUTORUN: | |
3174 | err = 0; | |
3175 | autostart_arrays(arg); | |
3176 | goto done; | |
3177 | #endif | |
3178 | default:; | |
3179 | } | |
3180 | ||
3181 | /* | |
3182 | * Commands creating/starting a new array: | |
3183 | */ | |
3184 | ||
3185 | mddev = inode->i_bdev->bd_disk->private_data; | |
3186 | ||
3187 | if (!mddev) { | |
3188 | BUG(); | |
3189 | goto abort; | |
3190 | } | |
3191 | ||
3192 | ||
3193 | if (cmd == START_ARRAY) { | |
3194 | /* START_ARRAY doesn't need to lock the array as autostart_array | |
3195 | * does the locking, and it could even be a different array | |
3196 | */ | |
3197 | static int cnt = 3; | |
3198 | if (cnt > 0 ) { | |
3199 | printk(KERN_WARNING | |
3200 | "md: %s(pid %d) used deprecated START_ARRAY ioctl. " | |
e8a00334 | 3201 | "This will not be supported beyond July 2006\n", |
1da177e4 LT |
3202 | current->comm, current->pid); |
3203 | cnt--; | |
3204 | } | |
3205 | err = autostart_array(new_decode_dev(arg)); | |
3206 | if (err) { | |
3207 | printk(KERN_WARNING "md: autostart failed!\n"); | |
3208 | goto abort; | |
3209 | } | |
3210 | goto done; | |
3211 | } | |
3212 | ||
3213 | err = mddev_lock(mddev); | |
3214 | if (err) { | |
3215 | printk(KERN_INFO | |
3216 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
3217 | err, cmd); | |
3218 | goto abort; | |
3219 | } | |
3220 | ||
3221 | switch (cmd) | |
3222 | { | |
3223 | case SET_ARRAY_INFO: | |
3224 | { | |
3225 | mdu_array_info_t info; | |
3226 | if (!arg) | |
3227 | memset(&info, 0, sizeof(info)); | |
3228 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
3229 | err = -EFAULT; | |
3230 | goto abort_unlock; | |
3231 | } | |
3232 | if (mddev->pers) { | |
3233 | err = update_array_info(mddev, &info); | |
3234 | if (err) { | |
3235 | printk(KERN_WARNING "md: couldn't update" | |
3236 | " array info. %d\n", err); | |
3237 | goto abort_unlock; | |
3238 | } | |
3239 | goto done_unlock; | |
3240 | } | |
3241 | if (!list_empty(&mddev->disks)) { | |
3242 | printk(KERN_WARNING | |
3243 | "md: array %s already has disks!\n", | |
3244 | mdname(mddev)); | |
3245 | err = -EBUSY; | |
3246 | goto abort_unlock; | |
3247 | } | |
3248 | if (mddev->raid_disks) { | |
3249 | printk(KERN_WARNING | |
3250 | "md: array %s already initialised!\n", | |
3251 | mdname(mddev)); | |
3252 | err = -EBUSY; | |
3253 | goto abort_unlock; | |
3254 | } | |
3255 | err = set_array_info(mddev, &info); | |
3256 | if (err) { | |
3257 | printk(KERN_WARNING "md: couldn't set" | |
3258 | " array info. %d\n", err); | |
3259 | goto abort_unlock; | |
3260 | } | |
3261 | } | |
3262 | goto done_unlock; | |
3263 | ||
3264 | default:; | |
3265 | } | |
3266 | ||
3267 | /* | |
3268 | * Commands querying/configuring an existing array: | |
3269 | */ | |
32a7627c N |
3270 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3271 | * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ | |
3272 | if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
3273 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { | |
1da177e4 LT |
3274 | err = -ENODEV; |
3275 | goto abort_unlock; | |
3276 | } | |
3277 | ||
3278 | /* | |
3279 | * Commands even a read-only array can execute: | |
3280 | */ | |
3281 | switch (cmd) | |
3282 | { | |
3283 | case GET_ARRAY_INFO: | |
3284 | err = get_array_info(mddev, argp); | |
3285 | goto done_unlock; | |
3286 | ||
32a7627c | 3287 | case GET_BITMAP_FILE: |
87162a28 | 3288 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
3289 | goto done_unlock; |
3290 | ||
1da177e4 LT |
3291 | case GET_DISK_INFO: |
3292 | err = get_disk_info(mddev, argp); | |
3293 | goto done_unlock; | |
3294 | ||
3295 | case RESTART_ARRAY_RW: | |
3296 | err = restart_array(mddev); | |
3297 | goto done_unlock; | |
3298 | ||
3299 | case STOP_ARRAY: | |
3300 | err = do_md_stop (mddev, 0); | |
3301 | goto done_unlock; | |
3302 | ||
3303 | case STOP_ARRAY_RO: | |
3304 | err = do_md_stop (mddev, 1); | |
3305 | goto done_unlock; | |
3306 | ||
3307 | /* | |
3308 | * We have a problem here : there is no easy way to give a CHS | |
3309 | * virtual geometry. We currently pretend that we have a 2 heads | |
3310 | * 4 sectors (with a BIG number of cylinders...). This drives | |
3311 | * dosfs just mad... ;-) | |
3312 | */ | |
3313 | case HDIO_GETGEO: | |
3314 | if (!loc) { | |
3315 | err = -EINVAL; | |
3316 | goto abort_unlock; | |
3317 | } | |
3318 | err = put_user (2, (char __user *) &loc->heads); | |
3319 | if (err) | |
3320 | goto abort_unlock; | |
3321 | err = put_user (4, (char __user *) &loc->sectors); | |
3322 | if (err) | |
3323 | goto abort_unlock; | |
3324 | err = put_user(get_capacity(mddev->gendisk)/8, | |
3325 | (short __user *) &loc->cylinders); | |
3326 | if (err) | |
3327 | goto abort_unlock; | |
3328 | err = put_user (get_start_sect(inode->i_bdev), | |
3329 | (long __user *) &loc->start); | |
3330 | goto done_unlock; | |
3331 | } | |
3332 | ||
3333 | /* | |
3334 | * The remaining ioctls are changing the state of the | |
f91de92e N |
3335 | * superblock, so we do not allow them on read-only arrays. |
3336 | * However non-MD ioctls (e.g. get-size) will still come through | |
3337 | * here and hit the 'default' below, so only disallow | |
3338 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 3339 | */ |
f91de92e N |
3340 | if (_IOC_TYPE(cmd) == MD_MAJOR && |
3341 | mddev->ro && mddev->pers) { | |
3342 | if (mddev->ro == 2) { | |
3343 | mddev->ro = 0; | |
3344 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3345 | md_wakeup_thread(mddev->thread); | |
3346 | ||
3347 | } else { | |
3348 | err = -EROFS; | |
3349 | goto abort_unlock; | |
3350 | } | |
1da177e4 LT |
3351 | } |
3352 | ||
3353 | switch (cmd) | |
3354 | { | |
3355 | case ADD_NEW_DISK: | |
3356 | { | |
3357 | mdu_disk_info_t info; | |
3358 | if (copy_from_user(&info, argp, sizeof(info))) | |
3359 | err = -EFAULT; | |
3360 | else | |
3361 | err = add_new_disk(mddev, &info); | |
3362 | goto done_unlock; | |
3363 | } | |
3364 | ||
3365 | case HOT_REMOVE_DISK: | |
3366 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3367 | goto done_unlock; | |
3368 | ||
3369 | case HOT_ADD_DISK: | |
3370 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3371 | goto done_unlock; | |
3372 | ||
3373 | case SET_DISK_FAULTY: | |
3374 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3375 | goto done_unlock; | |
3376 | ||
3377 | case RUN_ARRAY: | |
3378 | err = do_md_run (mddev); | |
3379 | goto done_unlock; | |
3380 | ||
32a7627c N |
3381 | case SET_BITMAP_FILE: |
3382 | err = set_bitmap_file(mddev, (int)arg); | |
3383 | goto done_unlock; | |
3384 | ||
1da177e4 LT |
3385 | default: |
3386 | if (_IOC_TYPE(cmd) == MD_MAJOR) | |
3387 | printk(KERN_WARNING "md: %s(pid %d) used" | |
3388 | " obsolete MD ioctl, upgrade your" | |
3389 | " software to use new ictls.\n", | |
3390 | current->comm, current->pid); | |
3391 | err = -EINVAL; | |
3392 | goto abort_unlock; | |
3393 | } | |
3394 | ||
3395 | done_unlock: | |
3396 | abort_unlock: | |
3397 | mddev_unlock(mddev); | |
3398 | ||
3399 | return err; | |
3400 | done: | |
3401 | if (err) | |
3402 | MD_BUG(); | |
3403 | abort: | |
3404 | return err; | |
3405 | } | |
3406 | ||
3407 | static int md_open(struct inode *inode, struct file *file) | |
3408 | { | |
3409 | /* | |
3410 | * Succeed if we can lock the mddev, which confirms that | |
3411 | * it isn't being stopped right now. | |
3412 | */ | |
3413 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3414 | int err; | |
3415 | ||
3416 | if ((err = mddev_lock(mddev))) | |
3417 | goto out; | |
3418 | ||
3419 | err = 0; | |
3420 | mddev_get(mddev); | |
3421 | mddev_unlock(mddev); | |
3422 | ||
3423 | check_disk_change(inode->i_bdev); | |
3424 | out: | |
3425 | return err; | |
3426 | } | |
3427 | ||
3428 | static int md_release(struct inode *inode, struct file * file) | |
3429 | { | |
3430 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3431 | ||
3432 | if (!mddev) | |
3433 | BUG(); | |
3434 | mddev_put(mddev); | |
3435 | ||
3436 | return 0; | |
3437 | } | |
3438 | ||
3439 | static int md_media_changed(struct gendisk *disk) | |
3440 | { | |
3441 | mddev_t *mddev = disk->private_data; | |
3442 | ||
3443 | return mddev->changed; | |
3444 | } | |
3445 | ||
3446 | static int md_revalidate(struct gendisk *disk) | |
3447 | { | |
3448 | mddev_t *mddev = disk->private_data; | |
3449 | ||
3450 | mddev->changed = 0; | |
3451 | return 0; | |
3452 | } | |
3453 | static struct block_device_operations md_fops = | |
3454 | { | |
3455 | .owner = THIS_MODULE, | |
3456 | .open = md_open, | |
3457 | .release = md_release, | |
3458 | .ioctl = md_ioctl, | |
3459 | .media_changed = md_media_changed, | |
3460 | .revalidate_disk= md_revalidate, | |
3461 | }; | |
3462 | ||
75c96f85 | 3463 | static int md_thread(void * arg) |
1da177e4 LT |
3464 | { |
3465 | mdk_thread_t *thread = arg; | |
3466 | ||
1da177e4 LT |
3467 | /* |
3468 | * md_thread is a 'system-thread', it's priority should be very | |
3469 | * high. We avoid resource deadlocks individually in each | |
3470 | * raid personality. (RAID5 does preallocation) We also use RR and | |
3471 | * the very same RT priority as kswapd, thus we will never get | |
3472 | * into a priority inversion deadlock. | |
3473 | * | |
3474 | * we definitely have to have equal or higher priority than | |
3475 | * bdflush, otherwise bdflush will deadlock if there are too | |
3476 | * many dirty RAID5 blocks. | |
3477 | */ | |
1da177e4 | 3478 | |
6985c43f | 3479 | allow_signal(SIGKILL); |
a6fb0934 | 3480 | while (!kthread_should_stop()) { |
1da177e4 | 3481 | |
93588e22 N |
3482 | /* We need to wait INTERRUPTIBLE so that |
3483 | * we don't add to the load-average. | |
3484 | * That means we need to be sure no signals are | |
3485 | * pending | |
3486 | */ | |
3487 | if (signal_pending(current)) | |
3488 | flush_signals(current); | |
3489 | ||
3490 | wait_event_interruptible_timeout | |
3491 | (thread->wqueue, | |
3492 | test_bit(THREAD_WAKEUP, &thread->flags) | |
3493 | || kthread_should_stop(), | |
3494 | thread->timeout); | |
3e1d1d28 | 3495 | try_to_freeze(); |
1da177e4 LT |
3496 | |
3497 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
3498 | ||
787453c2 | 3499 | thread->run(thread->mddev); |
1da177e4 | 3500 | } |
a6fb0934 | 3501 | |
1da177e4 LT |
3502 | return 0; |
3503 | } | |
3504 | ||
3505 | void md_wakeup_thread(mdk_thread_t *thread) | |
3506 | { | |
3507 | if (thread) { | |
3508 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
3509 | set_bit(THREAD_WAKEUP, &thread->flags); | |
3510 | wake_up(&thread->wqueue); | |
3511 | } | |
3512 | } | |
3513 | ||
3514 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
3515 | const char *name) | |
3516 | { | |
3517 | mdk_thread_t *thread; | |
1da177e4 | 3518 | |
9ffae0cf | 3519 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
3520 | if (!thread) |
3521 | return NULL; | |
3522 | ||
1da177e4 LT |
3523 | init_waitqueue_head(&thread->wqueue); |
3524 | ||
1da177e4 LT |
3525 | thread->run = run; |
3526 | thread->mddev = mddev; | |
32a7627c | 3527 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 3528 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 3529 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
3530 | kfree(thread); |
3531 | return NULL; | |
3532 | } | |
1da177e4 LT |
3533 | return thread; |
3534 | } | |
3535 | ||
1da177e4 LT |
3536 | void md_unregister_thread(mdk_thread_t *thread) |
3537 | { | |
d28446fe | 3538 | dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); |
a6fb0934 N |
3539 | |
3540 | kthread_stop(thread->tsk); | |
1da177e4 LT |
3541 | kfree(thread); |
3542 | } | |
3543 | ||
3544 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
3545 | { | |
3546 | if (!mddev) { | |
3547 | MD_BUG(); | |
3548 | return; | |
3549 | } | |
3550 | ||
b2d444d7 | 3551 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3552 | return; |
32a7627c | 3553 | /* |
1da177e4 LT |
3554 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
3555 | mdname(mddev), | |
3556 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
3557 | __builtin_return_address(0),__builtin_return_address(1), | |
3558 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 3559 | */ |
1da177e4 LT |
3560 | if (!mddev->pers->error_handler) |
3561 | return; | |
3562 | mddev->pers->error_handler(mddev,rdev); | |
3563 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3564 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3565 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 3566 | md_new_event(mddev); |
1da177e4 LT |
3567 | } |
3568 | ||
3569 | /* seq_file implementation /proc/mdstat */ | |
3570 | ||
3571 | static void status_unused(struct seq_file *seq) | |
3572 | { | |
3573 | int i = 0; | |
3574 | mdk_rdev_t *rdev; | |
3575 | struct list_head *tmp; | |
3576 | ||
3577 | seq_printf(seq, "unused devices: "); | |
3578 | ||
3579 | ITERATE_RDEV_PENDING(rdev,tmp) { | |
3580 | char b[BDEVNAME_SIZE]; | |
3581 | i++; | |
3582 | seq_printf(seq, "%s ", | |
3583 | bdevname(rdev->bdev,b)); | |
3584 | } | |
3585 | if (!i) | |
3586 | seq_printf(seq, "<none>"); | |
3587 | ||
3588 | seq_printf(seq, "\n"); | |
3589 | } | |
3590 | ||
3591 | ||
3592 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
3593 | { | |
3594 | unsigned long max_blocks, resync, res, dt, db, rt; | |
3595 | ||
3596 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
3597 | ||
3598 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3599 | max_blocks = mddev->resync_max_sectors >> 1; | |
3600 | else | |
3601 | max_blocks = mddev->size; | |
3602 | ||
3603 | /* | |
3604 | * Should not happen. | |
3605 | */ | |
3606 | if (!max_blocks) { | |
3607 | MD_BUG(); | |
3608 | return; | |
3609 | } | |
3610 | res = (resync/1024)*1000/(max_blocks/1024 + 1); | |
3611 | { | |
3612 | int i, x = res/50, y = 20-x; | |
3613 | seq_printf(seq, "["); | |
3614 | for (i = 0; i < x; i++) | |
3615 | seq_printf(seq, "="); | |
3616 | seq_printf(seq, ">"); | |
3617 | for (i = 0; i < y; i++) | |
3618 | seq_printf(seq, "."); | |
3619 | seq_printf(seq, "] "); | |
3620 | } | |
3621 | seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", | |
3622 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
3623 | "resync" : "recovery"), | |
3624 | res/10, res % 10, resync, max_blocks); | |
3625 | ||
3626 | /* | |
3627 | * We do not want to overflow, so the order of operands and | |
3628 | * the * 100 / 100 trick are important. We do a +1 to be | |
3629 | * safe against division by zero. We only estimate anyway. | |
3630 | * | |
3631 | * dt: time from mark until now | |
3632 | * db: blocks written from mark until now | |
3633 | * rt: remaining time | |
3634 | */ | |
3635 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
3636 | if (!dt) dt++; | |
3637 | db = resync - (mddev->resync_mark_cnt/2); | |
3638 | rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; | |
3639 | ||
3640 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
3641 | ||
3642 | seq_printf(seq, " speed=%ldK/sec", db/dt); | |
3643 | } | |
3644 | ||
3645 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
3646 | { | |
3647 | struct list_head *tmp; | |
3648 | loff_t l = *pos; | |
3649 | mddev_t *mddev; | |
3650 | ||
3651 | if (l >= 0x10000) | |
3652 | return NULL; | |
3653 | if (!l--) | |
3654 | /* header */ | |
3655 | return (void*)1; | |
3656 | ||
3657 | spin_lock(&all_mddevs_lock); | |
3658 | list_for_each(tmp,&all_mddevs) | |
3659 | if (!l--) { | |
3660 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
3661 | mddev_get(mddev); | |
3662 | spin_unlock(&all_mddevs_lock); | |
3663 | return mddev; | |
3664 | } | |
3665 | spin_unlock(&all_mddevs_lock); | |
3666 | if (!l--) | |
3667 | return (void*)2;/* tail */ | |
3668 | return NULL; | |
3669 | } | |
3670 | ||
3671 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3672 | { | |
3673 | struct list_head *tmp; | |
3674 | mddev_t *next_mddev, *mddev = v; | |
3675 | ||
3676 | ++*pos; | |
3677 | if (v == (void*)2) | |
3678 | return NULL; | |
3679 | ||
3680 | spin_lock(&all_mddevs_lock); | |
3681 | if (v == (void*)1) | |
3682 | tmp = all_mddevs.next; | |
3683 | else | |
3684 | tmp = mddev->all_mddevs.next; | |
3685 | if (tmp != &all_mddevs) | |
3686 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
3687 | else { | |
3688 | next_mddev = (void*)2; | |
3689 | *pos = 0x10000; | |
3690 | } | |
3691 | spin_unlock(&all_mddevs_lock); | |
3692 | ||
3693 | if (v != (void*)1) | |
3694 | mddev_put(mddev); | |
3695 | return next_mddev; | |
3696 | ||
3697 | } | |
3698 | ||
3699 | static void md_seq_stop(struct seq_file *seq, void *v) | |
3700 | { | |
3701 | mddev_t *mddev = v; | |
3702 | ||
3703 | if (mddev && v != (void*)1 && v != (void*)2) | |
3704 | mddev_put(mddev); | |
3705 | } | |
3706 | ||
d7603b7e N |
3707 | struct mdstat_info { |
3708 | int event; | |
3709 | }; | |
3710 | ||
1da177e4 LT |
3711 | static int md_seq_show(struct seq_file *seq, void *v) |
3712 | { | |
3713 | mddev_t *mddev = v; | |
3714 | sector_t size; | |
3715 | struct list_head *tmp2; | |
3716 | mdk_rdev_t *rdev; | |
d7603b7e | 3717 | struct mdstat_info *mi = seq->private; |
32a7627c | 3718 | struct bitmap *bitmap; |
1da177e4 LT |
3719 | |
3720 | if (v == (void*)1) { | |
2604b703 | 3721 | struct mdk_personality *pers; |
1da177e4 LT |
3722 | seq_printf(seq, "Personalities : "); |
3723 | spin_lock(&pers_lock); | |
2604b703 N |
3724 | list_for_each_entry(pers, &pers_list, list) |
3725 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
3726 | |
3727 | spin_unlock(&pers_lock); | |
3728 | seq_printf(seq, "\n"); | |
d7603b7e | 3729 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
3730 | return 0; |
3731 | } | |
3732 | if (v == (void*)2) { | |
3733 | status_unused(seq); | |
3734 | return 0; | |
3735 | } | |
3736 | ||
3737 | if (mddev_lock(mddev)!=0) | |
3738 | return -EINTR; | |
3739 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { | |
3740 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
3741 | mddev->pers ? "" : "in"); | |
3742 | if (mddev->pers) { | |
f91de92e | 3743 | if (mddev->ro==1) |
1da177e4 | 3744 | seq_printf(seq, " (read-only)"); |
f91de92e N |
3745 | if (mddev->ro==2) |
3746 | seq_printf(seq, "(auto-read-only)"); | |
1da177e4 LT |
3747 | seq_printf(seq, " %s", mddev->pers->name); |
3748 | } | |
3749 | ||
3750 | size = 0; | |
3751 | ITERATE_RDEV(mddev,rdev,tmp2) { | |
3752 | char b[BDEVNAME_SIZE]; | |
3753 | seq_printf(seq, " %s[%d]", | |
3754 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
3755 | if (test_bit(WriteMostly, &rdev->flags)) |
3756 | seq_printf(seq, "(W)"); | |
b2d444d7 | 3757 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
3758 | seq_printf(seq, "(F)"); |
3759 | continue; | |
b325a32e N |
3760 | } else if (rdev->raid_disk < 0) |
3761 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
3762 | size += rdev->size; |
3763 | } | |
3764 | ||
3765 | if (!list_empty(&mddev->disks)) { | |
3766 | if (mddev->pers) | |
3767 | seq_printf(seq, "\n %llu blocks", | |
3768 | (unsigned long long)mddev->array_size); | |
3769 | else | |
3770 | seq_printf(seq, "\n %llu blocks", | |
3771 | (unsigned long long)size); | |
3772 | } | |
1cd6bf19 N |
3773 | if (mddev->persistent) { |
3774 | if (mddev->major_version != 0 || | |
3775 | mddev->minor_version != 90) { | |
3776 | seq_printf(seq," super %d.%d", | |
3777 | mddev->major_version, | |
3778 | mddev->minor_version); | |
3779 | } | |
3780 | } else | |
3781 | seq_printf(seq, " super non-persistent"); | |
1da177e4 LT |
3782 | |
3783 | if (mddev->pers) { | |
3784 | mddev->pers->status (seq, mddev); | |
3785 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
3786 | if (mddev->pers->sync_request) { |
3787 | if (mddev->curr_resync > 2) { | |
3788 | status_resync (seq, mddev); | |
3789 | seq_printf(seq, "\n "); | |
3790 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
3791 | seq_printf(seq, "\tresync=DELAYED\n "); | |
3792 | else if (mddev->recovery_cp < MaxSector) | |
3793 | seq_printf(seq, "\tresync=PENDING\n "); | |
3794 | } | |
32a7627c N |
3795 | } else |
3796 | seq_printf(seq, "\n "); | |
3797 | ||
3798 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
3799 | unsigned long chunk_kb; |
3800 | unsigned long flags; | |
32a7627c N |
3801 | spin_lock_irqsave(&bitmap->lock, flags); |
3802 | chunk_kb = bitmap->chunksize >> 10; | |
3803 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
3804 | "%lu%s chunk", | |
3805 | bitmap->pages - bitmap->missing_pages, | |
3806 | bitmap->pages, | |
3807 | (bitmap->pages - bitmap->missing_pages) | |
3808 | << (PAGE_SHIFT - 10), | |
3809 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
3810 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
3811 | if (bitmap->file) { |
3812 | seq_printf(seq, ", file: "); | |
3813 | seq_path(seq, bitmap->file->f_vfsmnt, | |
3814 | bitmap->file->f_dentry," \t\n"); | |
32a7627c | 3815 | } |
78d742d8 | 3816 | |
32a7627c N |
3817 | seq_printf(seq, "\n"); |
3818 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
3819 | } |
3820 | ||
3821 | seq_printf(seq, "\n"); | |
3822 | } | |
3823 | mddev_unlock(mddev); | |
3824 | ||
3825 | return 0; | |
3826 | } | |
3827 | ||
3828 | static struct seq_operations md_seq_ops = { | |
3829 | .start = md_seq_start, | |
3830 | .next = md_seq_next, | |
3831 | .stop = md_seq_stop, | |
3832 | .show = md_seq_show, | |
3833 | }; | |
3834 | ||
3835 | static int md_seq_open(struct inode *inode, struct file *file) | |
3836 | { | |
3837 | int error; | |
d7603b7e N |
3838 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
3839 | if (mi == NULL) | |
3840 | return -ENOMEM; | |
1da177e4 LT |
3841 | |
3842 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
3843 | if (error) |
3844 | kfree(mi); | |
3845 | else { | |
3846 | struct seq_file *p = file->private_data; | |
3847 | p->private = mi; | |
3848 | mi->event = atomic_read(&md_event_count); | |
3849 | } | |
1da177e4 LT |
3850 | return error; |
3851 | } | |
3852 | ||
d7603b7e N |
3853 | static int md_seq_release(struct inode *inode, struct file *file) |
3854 | { | |
3855 | struct seq_file *m = file->private_data; | |
3856 | struct mdstat_info *mi = m->private; | |
3857 | m->private = NULL; | |
3858 | kfree(mi); | |
3859 | return seq_release(inode, file); | |
3860 | } | |
3861 | ||
3862 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) | |
3863 | { | |
3864 | struct seq_file *m = filp->private_data; | |
3865 | struct mdstat_info *mi = m->private; | |
3866 | int mask; | |
3867 | ||
3868 | poll_wait(filp, &md_event_waiters, wait); | |
3869 | ||
3870 | /* always allow read */ | |
3871 | mask = POLLIN | POLLRDNORM; | |
3872 | ||
3873 | if (mi->event != atomic_read(&md_event_count)) | |
3874 | mask |= POLLERR | POLLPRI; | |
3875 | return mask; | |
3876 | } | |
3877 | ||
1da177e4 LT |
3878 | static struct file_operations md_seq_fops = { |
3879 | .open = md_seq_open, | |
3880 | .read = seq_read, | |
3881 | .llseek = seq_lseek, | |
d7603b7e N |
3882 | .release = md_seq_release, |
3883 | .poll = mdstat_poll, | |
1da177e4 LT |
3884 | }; |
3885 | ||
2604b703 | 3886 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 3887 | { |
1da177e4 | 3888 | spin_lock(&pers_lock); |
2604b703 N |
3889 | list_add_tail(&p->list, &pers_list); |
3890 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
3891 | spin_unlock(&pers_lock); |
3892 | return 0; | |
3893 | } | |
3894 | ||
2604b703 | 3895 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 3896 | { |
2604b703 | 3897 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 3898 | spin_lock(&pers_lock); |
2604b703 | 3899 | list_del_init(&p->list); |
1da177e4 LT |
3900 | spin_unlock(&pers_lock); |
3901 | return 0; | |
3902 | } | |
3903 | ||
3904 | static int is_mddev_idle(mddev_t *mddev) | |
3905 | { | |
3906 | mdk_rdev_t * rdev; | |
3907 | struct list_head *tmp; | |
3908 | int idle; | |
3909 | unsigned long curr_events; | |
3910 | ||
3911 | idle = 1; | |
3912 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3913 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
a362357b JA |
3914 | curr_events = disk_stat_read(disk, sectors[0]) + |
3915 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 3916 | atomic_read(&disk->sync_io); |
c0e48521 N |
3917 | /* The difference between curr_events and last_events |
3918 | * will be affected by any new non-sync IO (making | |
3919 | * curr_events bigger) and any difference in the amount of | |
3920 | * in-flight syncio (making current_events bigger or smaller) | |
3921 | * The amount in-flight is currently limited to | |
3922 | * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6 | |
3923 | * which is at most 4096 sectors. | |
3924 | * These numbers are fairly fragile and should be made | |
3925 | * more robust, probably by enforcing the | |
3926 | * 'window size' that md_do_sync sort-of uses. | |
3927 | * | |
1da177e4 LT |
3928 | * Note: the following is an unsigned comparison. |
3929 | */ | |
c0e48521 | 3930 | if ((curr_events - rdev->last_events + 4096) > 8192) { |
1da177e4 LT |
3931 | rdev->last_events = curr_events; |
3932 | idle = 0; | |
3933 | } | |
3934 | } | |
3935 | return idle; | |
3936 | } | |
3937 | ||
3938 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
3939 | { | |
3940 | /* another "blocks" (512byte) blocks have been synced */ | |
3941 | atomic_sub(blocks, &mddev->recovery_active); | |
3942 | wake_up(&mddev->recovery_wait); | |
3943 | if (!ok) { | |
3944 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
3945 | md_wakeup_thread(mddev->thread); | |
3946 | // stop recovery, signal do_sync .... | |
3947 | } | |
3948 | } | |
3949 | ||
3950 | ||
06d91a5f N |
3951 | /* md_write_start(mddev, bi) |
3952 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
3953 | * in superblock) before writing, schedule a superblock update |
3954 | * and wait for it to complete. | |
06d91a5f | 3955 | */ |
3d310eb7 | 3956 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 3957 | { |
06d91a5f | 3958 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 3959 | return; |
06d91a5f | 3960 | |
f91de92e N |
3961 | BUG_ON(mddev->ro == 1); |
3962 | if (mddev->ro == 2) { | |
3963 | /* need to switch to read/write */ | |
3964 | mddev->ro = 0; | |
3965 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3966 | md_wakeup_thread(mddev->thread); | |
3967 | } | |
06d91a5f | 3968 | atomic_inc(&mddev->writes_pending); |
06d91a5f | 3969 | if (mddev->in_sync) { |
a9701a30 | 3970 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
3971 | if (mddev->in_sync) { |
3972 | mddev->in_sync = 0; | |
3973 | mddev->sb_dirty = 1; | |
3974 | md_wakeup_thread(mddev->thread); | |
3975 | } | |
a9701a30 | 3976 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 3977 | } |
3d310eb7 | 3978 | wait_event(mddev->sb_wait, mddev->sb_dirty==0); |
1da177e4 LT |
3979 | } |
3980 | ||
3981 | void md_write_end(mddev_t *mddev) | |
3982 | { | |
3983 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
3984 | if (mddev->safemode == 2) | |
3985 | md_wakeup_thread(mddev->thread); | |
3986 | else | |
3987 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); | |
3988 | } | |
3989 | } | |
3990 | ||
75c96f85 | 3991 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
3992 | |
3993 | #define SYNC_MARKS 10 | |
3994 | #define SYNC_MARK_STEP (3*HZ) | |
3995 | static void md_do_sync(mddev_t *mddev) | |
3996 | { | |
3997 | mddev_t *mddev2; | |
3998 | unsigned int currspeed = 0, | |
3999 | window; | |
57afd89f | 4000 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
4001 | unsigned long mark[SYNC_MARKS]; |
4002 | sector_t mark_cnt[SYNC_MARKS]; | |
4003 | int last_mark,m; | |
4004 | struct list_head *tmp; | |
4005 | sector_t last_check; | |
57afd89f | 4006 | int skipped = 0; |
1da177e4 LT |
4007 | |
4008 | /* just incase thread restarts... */ | |
4009 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
4010 | return; | |
4011 | ||
4012 | /* we overload curr_resync somewhat here. | |
4013 | * 0 == not engaged in resync at all | |
4014 | * 2 == checking that there is no conflict with another sync | |
4015 | * 1 == like 2, but have yielded to allow conflicting resync to | |
4016 | * commense | |
4017 | * other == active in resync - this many blocks | |
4018 | * | |
4019 | * Before starting a resync we must have set curr_resync to | |
4020 | * 2, and then checked that every "conflicting" array has curr_resync | |
4021 | * less than ours. When we find one that is the same or higher | |
4022 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
4023 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
4024 | * This will mean we have to start checking from the beginning again. | |
4025 | * | |
4026 | */ | |
4027 | ||
4028 | do { | |
4029 | mddev->curr_resync = 2; | |
4030 | ||
4031 | try_again: | |
787453c2 | 4032 | if (kthread_should_stop()) { |
6985c43f | 4033 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
4034 | goto skip; |
4035 | } | |
4036 | ITERATE_MDDEV(mddev2,tmp) { | |
1da177e4 LT |
4037 | if (mddev2 == mddev) |
4038 | continue; | |
4039 | if (mddev2->curr_resync && | |
4040 | match_mddev_units(mddev,mddev2)) { | |
4041 | DEFINE_WAIT(wq); | |
4042 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
4043 | /* arbitrarily yield */ | |
4044 | mddev->curr_resync = 1; | |
4045 | wake_up(&resync_wait); | |
4046 | } | |
4047 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
4048 | /* no need to wait here, we can wait the next | |
4049 | * time 'round when curr_resync == 2 | |
4050 | */ | |
4051 | continue; | |
787453c2 N |
4052 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
4053 | if (!kthread_should_stop() && | |
8712e553 | 4054 | mddev2->curr_resync >= mddev->curr_resync) { |
1da177e4 LT |
4055 | printk(KERN_INFO "md: delaying resync of %s" |
4056 | " until %s has finished resync (they" | |
4057 | " share one or more physical units)\n", | |
4058 | mdname(mddev), mdname(mddev2)); | |
4059 | mddev_put(mddev2); | |
4060 | schedule(); | |
4061 | finish_wait(&resync_wait, &wq); | |
4062 | goto try_again; | |
4063 | } | |
4064 | finish_wait(&resync_wait, &wq); | |
4065 | } | |
4066 | } | |
4067 | } while (mddev->curr_resync < 2); | |
4068 | ||
9d88883e | 4069 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 4070 | /* resync follows the size requested by the personality, |
57afd89f | 4071 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
4072 | */ |
4073 | max_sectors = mddev->resync_max_sectors; | |
9d88883e N |
4074 | mddev->resync_mismatches = 0; |
4075 | } else | |
1da177e4 LT |
4076 | /* recovery follows the physical size of devices */ |
4077 | max_sectors = mddev->size << 1; | |
4078 | ||
4079 | printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); | |
4080 | printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" | |
4081 | " %d KB/sec/disc.\n", sysctl_speed_limit_min); | |
338cec32 | 4082 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
1da177e4 LT |
4083 | "(but not more than %d KB/sec) for reconstruction.\n", |
4084 | sysctl_speed_limit_max); | |
4085 | ||
4086 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
32a7627c | 4087 | /* we don't use the checkpoint if there's a bitmap */ |
24dd469d N |
4088 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap |
4089 | && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1da177e4 LT |
4090 | j = mddev->recovery_cp; |
4091 | else | |
4092 | j = 0; | |
57afd89f | 4093 | io_sectors = 0; |
1da177e4 LT |
4094 | for (m = 0; m < SYNC_MARKS; m++) { |
4095 | mark[m] = jiffies; | |
57afd89f | 4096 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
4097 | } |
4098 | last_mark = 0; | |
4099 | mddev->resync_mark = mark[last_mark]; | |
4100 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
4101 | ||
4102 | /* | |
4103 | * Tune reconstruction: | |
4104 | */ | |
4105 | window = 32*(PAGE_SIZE/512); | |
4106 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
4107 | window/2,(unsigned long long) max_sectors/2); | |
4108 | ||
4109 | atomic_set(&mddev->recovery_active, 0); | |
4110 | init_waitqueue_head(&mddev->recovery_wait); | |
4111 | last_check = 0; | |
4112 | ||
4113 | if (j>2) { | |
4114 | printk(KERN_INFO | |
4115 | "md: resuming recovery of %s from checkpoint.\n", | |
4116 | mdname(mddev)); | |
4117 | mddev->curr_resync = j; | |
4118 | } | |
4119 | ||
4120 | while (j < max_sectors) { | |
57afd89f | 4121 | sector_t sectors; |
1da177e4 | 4122 | |
57afd89f N |
4123 | skipped = 0; |
4124 | sectors = mddev->pers->sync_request(mddev, j, &skipped, | |
4125 | currspeed < sysctl_speed_limit_min); | |
4126 | if (sectors == 0) { | |
1da177e4 LT |
4127 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
4128 | goto out; | |
4129 | } | |
57afd89f N |
4130 | |
4131 | if (!skipped) { /* actual IO requested */ | |
4132 | io_sectors += sectors; | |
4133 | atomic_add(sectors, &mddev->recovery_active); | |
4134 | } | |
4135 | ||
1da177e4 LT |
4136 | j += sectors; |
4137 | if (j>1) mddev->curr_resync = j; | |
d7603b7e N |
4138 | if (last_check == 0) |
4139 | /* this is the earliers that rebuilt will be | |
4140 | * visible in /proc/mdstat | |
4141 | */ | |
4142 | md_new_event(mddev); | |
57afd89f N |
4143 | |
4144 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
4145 | continue; |
4146 | ||
57afd89f | 4147 | last_check = io_sectors; |
1da177e4 LT |
4148 | |
4149 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
4150 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
4151 | break; | |
4152 | ||
4153 | repeat: | |
4154 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
4155 | /* step marks */ | |
4156 | int next = (last_mark+1) % SYNC_MARKS; | |
4157 | ||
4158 | mddev->resync_mark = mark[next]; | |
4159 | mddev->resync_mark_cnt = mark_cnt[next]; | |
4160 | mark[next] = jiffies; | |
57afd89f | 4161 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
4162 | last_mark = next; |
4163 | } | |
4164 | ||
4165 | ||
787453c2 | 4166 | if (kthread_should_stop()) { |
1da177e4 LT |
4167 | /* |
4168 | * got a signal, exit. | |
4169 | */ | |
4170 | printk(KERN_INFO | |
4171 | "md: md_do_sync() got signal ... exiting\n"); | |
1da177e4 LT |
4172 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4173 | goto out; | |
4174 | } | |
4175 | ||
4176 | /* | |
4177 | * this loop exits only if either when we are slower than | |
4178 | * the 'hard' speed limit, or the system was IO-idle for | |
4179 | * a jiffy. | |
4180 | * the system might be non-idle CPU-wise, but we only care | |
4181 | * about not overloading the IO subsystem. (things like an | |
4182 | * e2fsck being done on the RAID array should execute fast) | |
4183 | */ | |
4184 | mddev->queue->unplug_fn(mddev->queue); | |
4185 | cond_resched(); | |
4186 | ||
57afd89f N |
4187 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
4188 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 LT |
4189 | |
4190 | if (currspeed > sysctl_speed_limit_min) { | |
4191 | if ((currspeed > sysctl_speed_limit_max) || | |
4192 | !is_mddev_idle(mddev)) { | |
c0e48521 | 4193 | msleep(500); |
1da177e4 LT |
4194 | goto repeat; |
4195 | } | |
4196 | } | |
4197 | } | |
4198 | printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); | |
4199 | /* | |
4200 | * this also signals 'finished resyncing' to md_stop | |
4201 | */ | |
4202 | out: | |
4203 | mddev->queue->unplug_fn(mddev->queue); | |
4204 | ||
4205 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
4206 | ||
4207 | /* tell personality that we are finished */ | |
57afd89f | 4208 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
4209 | |
4210 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4211 | mddev->curr_resync > 2 && | |
4212 | mddev->curr_resync >= mddev->recovery_cp) { | |
4213 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4214 | printk(KERN_INFO | |
4215 | "md: checkpointing recovery of %s.\n", | |
4216 | mdname(mddev)); | |
4217 | mddev->recovery_cp = mddev->curr_resync; | |
4218 | } else | |
4219 | mddev->recovery_cp = MaxSector; | |
4220 | } | |
4221 | ||
1da177e4 LT |
4222 | skip: |
4223 | mddev->curr_resync = 0; | |
4224 | wake_up(&resync_wait); | |
4225 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
4226 | md_wakeup_thread(mddev->thread); | |
4227 | } | |
4228 | ||
4229 | ||
4230 | /* | |
4231 | * This routine is regularly called by all per-raid-array threads to | |
4232 | * deal with generic issues like resync and super-block update. | |
4233 | * Raid personalities that don't have a thread (linear/raid0) do not | |
4234 | * need this as they never do any recovery or update the superblock. | |
4235 | * | |
4236 | * It does not do any resync itself, but rather "forks" off other threads | |
4237 | * to do that as needed. | |
4238 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
4239 | * "->recovery" and create a thread at ->sync_thread. | |
4240 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
4241 | * and wakeups up this thread which will reap the thread and finish up. | |
4242 | * This thread also removes any faulty devices (with nr_pending == 0). | |
4243 | * | |
4244 | * The overall approach is: | |
4245 | * 1/ if the superblock needs updating, update it. | |
4246 | * 2/ If a recovery thread is running, don't do anything else. | |
4247 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
4248 | * 4/ If there are any faulty devices, remove them. | |
4249 | * 5/ If array is degraded, try to add spares devices | |
4250 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
4251 | */ | |
4252 | void md_check_recovery(mddev_t *mddev) | |
4253 | { | |
4254 | mdk_rdev_t *rdev; | |
4255 | struct list_head *rtmp; | |
4256 | ||
4257 | ||
5f40402d N |
4258 | if (mddev->bitmap) |
4259 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
4260 | |
4261 | if (mddev->ro) | |
4262 | return; | |
fca4d848 N |
4263 | |
4264 | if (signal_pending(current)) { | |
4265 | if (mddev->pers->sync_request) { | |
4266 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
4267 | mdname(mddev)); | |
4268 | mddev->safemode = 2; | |
4269 | } | |
4270 | flush_signals(current); | |
4271 | } | |
4272 | ||
1da177e4 LT |
4273 | if ( ! ( |
4274 | mddev->sb_dirty || | |
4275 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || | |
fca4d848 N |
4276 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
4277 | (mddev->safemode == 1) || | |
4278 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
4279 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
4280 | )) |
4281 | return; | |
fca4d848 | 4282 | |
1da177e4 LT |
4283 | if (mddev_trylock(mddev)==0) { |
4284 | int spares =0; | |
fca4d848 | 4285 | |
a9701a30 | 4286 | spin_lock_irq(&mddev->write_lock); |
fca4d848 N |
4287 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
4288 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
4289 | mddev->in_sync = 1; | |
4290 | mddev->sb_dirty = 1; | |
4291 | } | |
4292 | if (mddev->safemode == 1) | |
4293 | mddev->safemode = 0; | |
a9701a30 | 4294 | spin_unlock_irq(&mddev->write_lock); |
fca4d848 | 4295 | |
1da177e4 LT |
4296 | if (mddev->sb_dirty) |
4297 | md_update_sb(mddev); | |
06d91a5f | 4298 | |
06d91a5f | 4299 | |
1da177e4 LT |
4300 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4301 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
4302 | /* resync/recovery still happening */ | |
4303 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4304 | goto unlock; | |
4305 | } | |
4306 | if (mddev->sync_thread) { | |
4307 | /* resync has finished, collect result */ | |
4308 | md_unregister_thread(mddev->sync_thread); | |
4309 | mddev->sync_thread = NULL; | |
4310 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4311 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4312 | /* success...*/ | |
4313 | /* activate any spares */ | |
4314 | mddev->pers->spare_active(mddev); | |
4315 | } | |
4316 | md_update_sb(mddev); | |
41158c7e N |
4317 | |
4318 | /* if array is no-longer degraded, then any saved_raid_disk | |
4319 | * information must be scrapped | |
4320 | */ | |
4321 | if (!mddev->degraded) | |
4322 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4323 | rdev->saved_raid_disk = -1; | |
4324 | ||
1da177e4 LT |
4325 | mddev->recovery = 0; |
4326 | /* flag recovery needed just to double check */ | |
4327 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
d7603b7e | 4328 | md_new_event(mddev); |
1da177e4 LT |
4329 | goto unlock; |
4330 | } | |
24dd469d N |
4331 | /* Clear some bits that don't mean anything, but |
4332 | * might be left set | |
4333 | */ | |
4334 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4335 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
4336 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4337 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 LT |
4338 | |
4339 | /* no recovery is running. | |
4340 | * remove any failed drives, then | |
4341 | * add spares if possible. | |
4342 | * Spare are also removed and re-added, to allow | |
4343 | * the personality to fail the re-add. | |
4344 | */ | |
4345 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4346 | if (rdev->raid_disk >= 0 && | |
b2d444d7 | 4347 | (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && |
1da177e4 | 4348 | atomic_read(&rdev->nr_pending)==0) { |
86e6ffdd N |
4349 | if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { |
4350 | char nm[20]; | |
4351 | sprintf(nm,"rd%d", rdev->raid_disk); | |
4352 | sysfs_remove_link(&mddev->kobj, nm); | |
1da177e4 | 4353 | rdev->raid_disk = -1; |
86e6ffdd | 4354 | } |
1da177e4 LT |
4355 | } |
4356 | ||
4357 | if (mddev->degraded) { | |
4358 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4359 | if (rdev->raid_disk < 0 | |
b2d444d7 | 4360 | && !test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
4361 | if (mddev->pers->hot_add_disk(mddev,rdev)) { |
4362 | char nm[20]; | |
4363 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4364 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
1da177e4 | 4365 | spares++; |
d7603b7e | 4366 | md_new_event(mddev); |
86e6ffdd | 4367 | } else |
1da177e4 LT |
4368 | break; |
4369 | } | |
4370 | } | |
4371 | ||
24dd469d N |
4372 | if (spares) { |
4373 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4374 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4375 | } else if (mddev->recovery_cp < MaxSector) { | |
4376 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4377 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4378 | /* nothing to be done ... */ | |
1da177e4 | 4379 | goto unlock; |
24dd469d | 4380 | |
1da177e4 LT |
4381 | if (mddev->pers->sync_request) { |
4382 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
4383 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
4384 | /* We are adding a device or devices to an array | |
4385 | * which has the bitmap stored on all devices. | |
4386 | * So make sure all bitmap pages get written | |
4387 | */ | |
4388 | bitmap_write_all(mddev->bitmap); | |
4389 | } | |
1da177e4 LT |
4390 | mddev->sync_thread = md_register_thread(md_do_sync, |
4391 | mddev, | |
4392 | "%s_resync"); | |
4393 | if (!mddev->sync_thread) { | |
4394 | printk(KERN_ERR "%s: could not start resync" | |
4395 | " thread...\n", | |
4396 | mdname(mddev)); | |
4397 | /* leave the spares where they are, it shouldn't hurt */ | |
4398 | mddev->recovery = 0; | |
d7603b7e | 4399 | } else |
1da177e4 | 4400 | md_wakeup_thread(mddev->sync_thread); |
d7603b7e | 4401 | md_new_event(mddev); |
1da177e4 LT |
4402 | } |
4403 | unlock: | |
4404 | mddev_unlock(mddev); | |
4405 | } | |
4406 | } | |
4407 | ||
75c96f85 AB |
4408 | static int md_notify_reboot(struct notifier_block *this, |
4409 | unsigned long code, void *x) | |
1da177e4 LT |
4410 | { |
4411 | struct list_head *tmp; | |
4412 | mddev_t *mddev; | |
4413 | ||
4414 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
4415 | ||
4416 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
4417 | ||
4418 | ITERATE_MDDEV(mddev,tmp) | |
4419 | if (mddev_trylock(mddev)==0) | |
4420 | do_md_stop (mddev, 1); | |
4421 | /* | |
4422 | * certain more exotic SCSI devices are known to be | |
4423 | * volatile wrt too early system reboots. While the | |
4424 | * right place to handle this issue is the given | |
4425 | * driver, we do want to have a safe RAID driver ... | |
4426 | */ | |
4427 | mdelay(1000*1); | |
4428 | } | |
4429 | return NOTIFY_DONE; | |
4430 | } | |
4431 | ||
75c96f85 | 4432 | static struct notifier_block md_notifier = { |
1da177e4 LT |
4433 | .notifier_call = md_notify_reboot, |
4434 | .next = NULL, | |
4435 | .priority = INT_MAX, /* before any real devices */ | |
4436 | }; | |
4437 | ||
4438 | static void md_geninit(void) | |
4439 | { | |
4440 | struct proc_dir_entry *p; | |
4441 | ||
4442 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
4443 | ||
4444 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
4445 | if (p) | |
4446 | p->proc_fops = &md_seq_fops; | |
4447 | } | |
4448 | ||
75c96f85 | 4449 | static int __init md_init(void) |
1da177e4 LT |
4450 | { |
4451 | int minor; | |
4452 | ||
4453 | printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," | |
4454 | " MD_SB_DISKS=%d\n", | |
4455 | MD_MAJOR_VERSION, MD_MINOR_VERSION, | |
4456 | MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); | |
bd926c63 | 4457 | printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, |
32a7627c | 4458 | BITMAP_MINOR); |
1da177e4 LT |
4459 | |
4460 | if (register_blkdev(MAJOR_NR, "md")) | |
4461 | return -1; | |
4462 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
4463 | unregister_blkdev(MAJOR_NR, "md"); | |
4464 | return -1; | |
4465 | } | |
4466 | devfs_mk_dir("md"); | |
4467 | blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, | |
4468 | md_probe, NULL, NULL); | |
4469 | blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, | |
4470 | md_probe, NULL, NULL); | |
4471 | ||
4472 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4473 | devfs_mk_bdev(MKDEV(MAJOR_NR, minor), | |
4474 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4475 | "md/%d", minor); | |
4476 | ||
4477 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4478 | devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), | |
4479 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4480 | "md/mdp%d", minor); | |
4481 | ||
4482 | ||
4483 | register_reboot_notifier(&md_notifier); | |
4484 | raid_table_header = register_sysctl_table(raid_root_table, 1); | |
4485 | ||
4486 | md_geninit(); | |
4487 | return (0); | |
4488 | } | |
4489 | ||
4490 | ||
4491 | #ifndef MODULE | |
4492 | ||
4493 | /* | |
4494 | * Searches all registered partitions for autorun RAID arrays | |
4495 | * at boot time. | |
4496 | */ | |
4497 | static dev_t detected_devices[128]; | |
4498 | static int dev_cnt; | |
4499 | ||
4500 | void md_autodetect_dev(dev_t dev) | |
4501 | { | |
4502 | if (dev_cnt >= 0 && dev_cnt < 127) | |
4503 | detected_devices[dev_cnt++] = dev; | |
4504 | } | |
4505 | ||
4506 | ||
4507 | static void autostart_arrays(int part) | |
4508 | { | |
4509 | mdk_rdev_t *rdev; | |
4510 | int i; | |
4511 | ||
4512 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); | |
4513 | ||
4514 | for (i = 0; i < dev_cnt; i++) { | |
4515 | dev_t dev = detected_devices[i]; | |
4516 | ||
4517 | rdev = md_import_device(dev,0, 0); | |
4518 | if (IS_ERR(rdev)) | |
4519 | continue; | |
4520 | ||
b2d444d7 | 4521 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4522 | MD_BUG(); |
4523 | continue; | |
4524 | } | |
4525 | list_add(&rdev->same_set, &pending_raid_disks); | |
4526 | } | |
4527 | dev_cnt = 0; | |
4528 | ||
4529 | autorun_devices(part); | |
4530 | } | |
4531 | ||
4532 | #endif | |
4533 | ||
4534 | static __exit void md_exit(void) | |
4535 | { | |
4536 | mddev_t *mddev; | |
4537 | struct list_head *tmp; | |
4538 | int i; | |
4539 | blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); | |
4540 | blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); | |
4541 | for (i=0; i < MAX_MD_DEVS; i++) | |
4542 | devfs_remove("md/%d", i); | |
4543 | for (i=0; i < MAX_MD_DEVS; i++) | |
4544 | devfs_remove("md/d%d", i); | |
4545 | ||
4546 | devfs_remove("md"); | |
4547 | ||
4548 | unregister_blkdev(MAJOR_NR,"md"); | |
4549 | unregister_blkdev(mdp_major, "mdp"); | |
4550 | unregister_reboot_notifier(&md_notifier); | |
4551 | unregister_sysctl_table(raid_table_header); | |
4552 | remove_proc_entry("mdstat", NULL); | |
4553 | ITERATE_MDDEV(mddev,tmp) { | |
4554 | struct gendisk *disk = mddev->gendisk; | |
4555 | if (!disk) | |
4556 | continue; | |
4557 | export_array(mddev); | |
4558 | del_gendisk(disk); | |
4559 | put_disk(disk); | |
4560 | mddev->gendisk = NULL; | |
4561 | mddev_put(mddev); | |
4562 | } | |
4563 | } | |
4564 | ||
4565 | module_init(md_init) | |
4566 | module_exit(md_exit) | |
4567 | ||
f91de92e N |
4568 | static int get_ro(char *buffer, struct kernel_param *kp) |
4569 | { | |
4570 | return sprintf(buffer, "%d", start_readonly); | |
4571 | } | |
4572 | static int set_ro(const char *val, struct kernel_param *kp) | |
4573 | { | |
4574 | char *e; | |
4575 | int num = simple_strtoul(val, &e, 10); | |
4576 | if (*val && (*e == '\0' || *e == '\n')) { | |
4577 | start_readonly = num; | |
4578 | return 0;; | |
4579 | } | |
4580 | return -EINVAL; | |
4581 | } | |
4582 | ||
4583 | module_param_call(start_ro, set_ro, get_ro, NULL, 0600); | |
6ff8d8ec N |
4584 | module_param(start_dirty_degraded, int, 0644); |
4585 | ||
f91de92e | 4586 | |
1da177e4 LT |
4587 | EXPORT_SYMBOL(register_md_personality); |
4588 | EXPORT_SYMBOL(unregister_md_personality); | |
4589 | EXPORT_SYMBOL(md_error); | |
4590 | EXPORT_SYMBOL(md_done_sync); | |
4591 | EXPORT_SYMBOL(md_write_start); | |
4592 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
4593 | EXPORT_SYMBOL(md_register_thread); |
4594 | EXPORT_SYMBOL(md_unregister_thread); | |
4595 | EXPORT_SYMBOL(md_wakeup_thread); | |
4596 | EXPORT_SYMBOL(md_print_devices); | |
4597 | EXPORT_SYMBOL(md_check_recovery); | |
4598 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 4599 | MODULE_ALIAS("md"); |
72008652 | 4600 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |