Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/config.h> | |
a6fb0934 | 37 | #include <linux/kthread.h> |
1da177e4 LT |
38 | #include <linux/linkage.h> |
39 | #include <linux/raid/md.h> | |
32a7627c | 40 | #include <linux/raid/bitmap.h> |
1da177e4 LT |
41 | #include <linux/sysctl.h> |
42 | #include <linux/devfs_fs_kernel.h> | |
43 | #include <linux/buffer_head.h> /* for invalidate_bdev */ | |
44 | #include <linux/suspend.h> | |
d7603b7e | 45 | #include <linux/poll.h> |
1da177e4 LT |
46 | |
47 | #include <linux/init.h> | |
48 | ||
32a7627c N |
49 | #include <linux/file.h> |
50 | ||
1da177e4 LT |
51 | #ifdef CONFIG_KMOD |
52 | #include <linux/kmod.h> | |
53 | #endif | |
54 | ||
55 | #include <asm/unaligned.h> | |
56 | ||
57 | #define MAJOR_NR MD_MAJOR | |
58 | #define MD_DRIVER | |
59 | ||
60 | /* 63 partitions with the alternate major number (mdp) */ | |
61 | #define MdpMinorShift 6 | |
62 | ||
63 | #define DEBUG 0 | |
64 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
65 | ||
66 | ||
67 | #ifndef MODULE | |
68 | static void autostart_arrays (int part); | |
69 | #endif | |
70 | ||
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. | |
88202a0c | 84 | * or /sys/block/mdX/md/sync_speed_{min,max} |
1da177e4 LT |
85 | */ |
86 | ||
87 | static int sysctl_speed_limit_min = 1000; | |
88 | static int sysctl_speed_limit_max = 200000; | |
88202a0c N |
89 | static inline int speed_min(mddev_t *mddev) |
90 | { | |
91 | return mddev->sync_speed_min ? | |
92 | mddev->sync_speed_min : sysctl_speed_limit_min; | |
93 | } | |
94 | ||
95 | static inline int speed_max(mddev_t *mddev) | |
96 | { | |
97 | return mddev->sync_speed_max ? | |
98 | mddev->sync_speed_max : sysctl_speed_limit_max; | |
99 | } | |
1da177e4 LT |
100 | |
101 | static struct ctl_table_header *raid_table_header; | |
102 | ||
103 | static ctl_table raid_table[] = { | |
104 | { | |
105 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
106 | .procname = "speed_limit_min", | |
107 | .data = &sysctl_speed_limit_min, | |
108 | .maxlen = sizeof(int), | |
109 | .mode = 0644, | |
110 | .proc_handler = &proc_dointvec, | |
111 | }, | |
112 | { | |
113 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
114 | .procname = "speed_limit_max", | |
115 | .data = &sysctl_speed_limit_max, | |
116 | .maxlen = sizeof(int), | |
117 | .mode = 0644, | |
118 | .proc_handler = &proc_dointvec, | |
119 | }, | |
120 | { .ctl_name = 0 } | |
121 | }; | |
122 | ||
123 | static ctl_table raid_dir_table[] = { | |
124 | { | |
125 | .ctl_name = DEV_RAID, | |
126 | .procname = "raid", | |
127 | .maxlen = 0, | |
128 | .mode = 0555, | |
129 | .child = raid_table, | |
130 | }, | |
131 | { .ctl_name = 0 } | |
132 | }; | |
133 | ||
134 | static ctl_table raid_root_table[] = { | |
135 | { | |
136 | .ctl_name = CTL_DEV, | |
137 | .procname = "dev", | |
138 | .maxlen = 0, | |
139 | .mode = 0555, | |
140 | .child = raid_dir_table, | |
141 | }, | |
142 | { .ctl_name = 0 } | |
143 | }; | |
144 | ||
145 | static struct block_device_operations md_fops; | |
146 | ||
f91de92e N |
147 | static int start_readonly; |
148 | ||
d7603b7e N |
149 | /* |
150 | * We have a system wide 'event count' that is incremented | |
151 | * on any 'interesting' event, and readers of /proc/mdstat | |
152 | * can use 'poll' or 'select' to find out when the event | |
153 | * count increases. | |
154 | * | |
155 | * Events are: | |
156 | * start array, stop array, error, add device, remove device, | |
157 | * start build, activate spare | |
158 | */ | |
2989ddbd | 159 | static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters); |
d7603b7e | 160 | static atomic_t md_event_count; |
07dbd377 | 161 | static void md_new_event(mddev_t *mddev) |
d7603b7e N |
162 | { |
163 | atomic_inc(&md_event_count); | |
164 | wake_up(&md_event_waiters); | |
165 | } | |
166 | ||
1da177e4 LT |
167 | /* |
168 | * Enables to iterate over all existing md arrays | |
169 | * all_mddevs_lock protects this list. | |
170 | */ | |
171 | static LIST_HEAD(all_mddevs); | |
172 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
173 | ||
174 | ||
175 | /* | |
176 | * iterates through all used mddevs in the system. | |
177 | * We take care to grab the all_mddevs_lock whenever navigating | |
178 | * the list, and to always hold a refcount when unlocked. | |
179 | * Any code which breaks out of this loop while own | |
180 | * a reference to the current mddev and must mddev_put it. | |
181 | */ | |
182 | #define ITERATE_MDDEV(mddev,tmp) \ | |
183 | \ | |
184 | for (({ spin_lock(&all_mddevs_lock); \ | |
185 | tmp = all_mddevs.next; \ | |
186 | mddev = NULL;}); \ | |
187 | ({ if (tmp != &all_mddevs) \ | |
188 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
189 | spin_unlock(&all_mddevs_lock); \ | |
190 | if (mddev) mddev_put(mddev); \ | |
191 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
192 | tmp != &all_mddevs;}); \ | |
193 | ({ spin_lock(&all_mddevs_lock); \ | |
194 | tmp = tmp->next;}) \ | |
195 | ) | |
196 | ||
197 | ||
198 | static int md_fail_request (request_queue_t *q, struct bio *bio) | |
199 | { | |
200 | bio_io_error(bio, bio->bi_size); | |
201 | return 0; | |
202 | } | |
203 | ||
204 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
205 | { | |
206 | atomic_inc(&mddev->active); | |
207 | return mddev; | |
208 | } | |
209 | ||
210 | static void mddev_put(mddev_t *mddev) | |
211 | { | |
212 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
213 | return; | |
214 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
215 | list_del(&mddev->all_mddevs); | |
1312f40e AV |
216 | /* that blocks */ |
217 | blk_cleanup_queue(mddev->queue); | |
218 | /* that also blocks */ | |
eae1701f | 219 | kobject_unregister(&mddev->kobj); |
1312f40e | 220 | /* result blows... */ |
1da177e4 LT |
221 | } |
222 | spin_unlock(&all_mddevs_lock); | |
223 | } | |
224 | ||
225 | static mddev_t * mddev_find(dev_t unit) | |
226 | { | |
227 | mddev_t *mddev, *new = NULL; | |
228 | ||
229 | retry: | |
230 | spin_lock(&all_mddevs_lock); | |
231 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
232 | if (mddev->unit == unit) { | |
233 | mddev_get(mddev); | |
234 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 235 | kfree(new); |
1da177e4 LT |
236 | return mddev; |
237 | } | |
238 | ||
239 | if (new) { | |
240 | list_add(&new->all_mddevs, &all_mddevs); | |
241 | spin_unlock(&all_mddevs_lock); | |
242 | return new; | |
243 | } | |
244 | spin_unlock(&all_mddevs_lock); | |
245 | ||
9ffae0cf | 246 | new = kzalloc(sizeof(*new), GFP_KERNEL); |
1da177e4 LT |
247 | if (!new) |
248 | return NULL; | |
249 | ||
1da177e4 LT |
250 | new->unit = unit; |
251 | if (MAJOR(unit) == MD_MAJOR) | |
252 | new->md_minor = MINOR(unit); | |
253 | else | |
254 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
255 | ||
256 | init_MUTEX(&new->reconfig_sem); | |
257 | INIT_LIST_HEAD(&new->disks); | |
258 | INIT_LIST_HEAD(&new->all_mddevs); | |
259 | init_timer(&new->safemode_timer); | |
260 | atomic_set(&new->active, 1); | |
06d91a5f | 261 | spin_lock_init(&new->write_lock); |
3d310eb7 | 262 | init_waitqueue_head(&new->sb_wait); |
1da177e4 LT |
263 | |
264 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
265 | if (!new->queue) { | |
266 | kfree(new); | |
267 | return NULL; | |
268 | } | |
269 | ||
270 | blk_queue_make_request(new->queue, md_fail_request); | |
271 | ||
272 | goto retry; | |
273 | } | |
274 | ||
275 | static inline int mddev_lock(mddev_t * mddev) | |
276 | { | |
277 | return down_interruptible(&mddev->reconfig_sem); | |
278 | } | |
279 | ||
280 | static inline void mddev_lock_uninterruptible(mddev_t * mddev) | |
281 | { | |
282 | down(&mddev->reconfig_sem); | |
283 | } | |
284 | ||
285 | static inline int mddev_trylock(mddev_t * mddev) | |
286 | { | |
287 | return down_trylock(&mddev->reconfig_sem); | |
288 | } | |
289 | ||
290 | static inline void mddev_unlock(mddev_t * mddev) | |
291 | { | |
292 | up(&mddev->reconfig_sem); | |
293 | ||
005eca5e | 294 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
295 | } |
296 | ||
2989ddbd | 297 | static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) |
1da177e4 LT |
298 | { |
299 | mdk_rdev_t * rdev; | |
300 | struct list_head *tmp; | |
301 | ||
302 | ITERATE_RDEV(mddev,rdev,tmp) { | |
303 | if (rdev->desc_nr == nr) | |
304 | return rdev; | |
305 | } | |
306 | return NULL; | |
307 | } | |
308 | ||
309 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
310 | { | |
311 | struct list_head *tmp; | |
312 | mdk_rdev_t *rdev; | |
313 | ||
314 | ITERATE_RDEV(mddev,rdev,tmp) { | |
315 | if (rdev->bdev->bd_dev == dev) | |
316 | return rdev; | |
317 | } | |
318 | return NULL; | |
319 | } | |
320 | ||
d9d166c2 | 321 | static struct mdk_personality *find_pers(int level, char *clevel) |
2604b703 N |
322 | { |
323 | struct mdk_personality *pers; | |
d9d166c2 N |
324 | list_for_each_entry(pers, &pers_list, list) { |
325 | if (level != LEVEL_NONE && pers->level == level) | |
2604b703 | 326 | return pers; |
d9d166c2 N |
327 | if (strcmp(pers->name, clevel)==0) |
328 | return pers; | |
329 | } | |
2604b703 N |
330 | return NULL; |
331 | } | |
332 | ||
77933d72 | 333 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 LT |
334 | { |
335 | sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
336 | return MD_NEW_SIZE_BLOCKS(size); | |
337 | } | |
338 | ||
339 | static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) | |
340 | { | |
341 | sector_t size; | |
342 | ||
343 | size = rdev->sb_offset; | |
344 | ||
345 | if (chunk_size) | |
346 | size &= ~((sector_t)chunk_size/1024 - 1); | |
347 | return size; | |
348 | } | |
349 | ||
350 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
351 | { | |
352 | if (rdev->sb_page) | |
353 | MD_BUG(); | |
354 | ||
355 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
356 | if (!rdev->sb_page) { | |
357 | printk(KERN_ALERT "md: out of memory.\n"); | |
358 | return -EINVAL; | |
359 | } | |
360 | ||
361 | return 0; | |
362 | } | |
363 | ||
364 | static void free_disk_sb(mdk_rdev_t * rdev) | |
365 | { | |
366 | if (rdev->sb_page) { | |
2d1f3b5d | 367 | put_page(rdev->sb_page); |
1da177e4 LT |
368 | rdev->sb_loaded = 0; |
369 | rdev->sb_page = NULL; | |
370 | rdev->sb_offset = 0; | |
371 | rdev->size = 0; | |
372 | } | |
373 | } | |
374 | ||
375 | ||
7bfa19f2 N |
376 | static int super_written(struct bio *bio, unsigned int bytes_done, int error) |
377 | { | |
378 | mdk_rdev_t *rdev = bio->bi_private; | |
a9701a30 | 379 | mddev_t *mddev = rdev->mddev; |
7bfa19f2 N |
380 | if (bio->bi_size) |
381 | return 1; | |
382 | ||
383 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
a9701a30 | 384 | md_error(mddev, rdev); |
7bfa19f2 | 385 | |
a9701a30 N |
386 | if (atomic_dec_and_test(&mddev->pending_writes)) |
387 | wake_up(&mddev->sb_wait); | |
f8b58edf | 388 | bio_put(bio); |
7bfa19f2 N |
389 | return 0; |
390 | } | |
391 | ||
a9701a30 N |
392 | static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error) |
393 | { | |
394 | struct bio *bio2 = bio->bi_private; | |
395 | mdk_rdev_t *rdev = bio2->bi_private; | |
396 | mddev_t *mddev = rdev->mddev; | |
397 | if (bio->bi_size) | |
398 | return 1; | |
399 | ||
400 | if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && | |
401 | error == -EOPNOTSUPP) { | |
402 | unsigned long flags; | |
403 | /* barriers don't appear to be supported :-( */ | |
404 | set_bit(BarriersNotsupp, &rdev->flags); | |
405 | mddev->barriers_work = 0; | |
406 | spin_lock_irqsave(&mddev->write_lock, flags); | |
407 | bio2->bi_next = mddev->biolist; | |
408 | mddev->biolist = bio2; | |
409 | spin_unlock_irqrestore(&mddev->write_lock, flags); | |
410 | wake_up(&mddev->sb_wait); | |
411 | bio_put(bio); | |
412 | return 0; | |
413 | } | |
414 | bio_put(bio2); | |
415 | bio->bi_private = rdev; | |
416 | return super_written(bio, bytes_done, error); | |
417 | } | |
418 | ||
7bfa19f2 N |
419 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, |
420 | sector_t sector, int size, struct page *page) | |
421 | { | |
422 | /* write first size bytes of page to sector of rdev | |
423 | * Increment mddev->pending_writes before returning | |
424 | * and decrement it on completion, waking up sb_wait | |
425 | * if zero is reached. | |
426 | * If an error occurred, call md_error | |
a9701a30 N |
427 | * |
428 | * As we might need to resubmit the request if BIO_RW_BARRIER | |
429 | * causes ENOTSUPP, we allocate a spare bio... | |
7bfa19f2 N |
430 | */ |
431 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
a9701a30 | 432 | int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC); |
7bfa19f2 N |
433 | |
434 | bio->bi_bdev = rdev->bdev; | |
435 | bio->bi_sector = sector; | |
436 | bio_add_page(bio, page, size, 0); | |
437 | bio->bi_private = rdev; | |
438 | bio->bi_end_io = super_written; | |
a9701a30 N |
439 | bio->bi_rw = rw; |
440 | ||
7bfa19f2 | 441 | atomic_inc(&mddev->pending_writes); |
a9701a30 N |
442 | if (!test_bit(BarriersNotsupp, &rdev->flags)) { |
443 | struct bio *rbio; | |
444 | rw |= (1<<BIO_RW_BARRIER); | |
445 | rbio = bio_clone(bio, GFP_NOIO); | |
446 | rbio->bi_private = bio; | |
447 | rbio->bi_end_io = super_written_barrier; | |
448 | submit_bio(rw, rbio); | |
449 | } else | |
450 | submit_bio(rw, bio); | |
451 | } | |
452 | ||
453 | void md_super_wait(mddev_t *mddev) | |
454 | { | |
455 | /* wait for all superblock writes that were scheduled to complete. | |
456 | * if any had to be retried (due to BARRIER problems), retry them | |
457 | */ | |
458 | DEFINE_WAIT(wq); | |
459 | for(;;) { | |
460 | prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE); | |
461 | if (atomic_read(&mddev->pending_writes)==0) | |
462 | break; | |
463 | while (mddev->biolist) { | |
464 | struct bio *bio; | |
465 | spin_lock_irq(&mddev->write_lock); | |
466 | bio = mddev->biolist; | |
467 | mddev->biolist = bio->bi_next ; | |
468 | bio->bi_next = NULL; | |
469 | spin_unlock_irq(&mddev->write_lock); | |
470 | submit_bio(bio->bi_rw, bio); | |
471 | } | |
472 | schedule(); | |
473 | } | |
474 | finish_wait(&mddev->sb_wait, &wq); | |
7bfa19f2 N |
475 | } |
476 | ||
1da177e4 LT |
477 | static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) |
478 | { | |
479 | if (bio->bi_size) | |
480 | return 1; | |
481 | ||
482 | complete((struct completion*)bio->bi_private); | |
483 | return 0; | |
484 | } | |
485 | ||
a654b9d8 | 486 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
487 | struct page *page, int rw) |
488 | { | |
baaa2c51 | 489 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
490 | struct completion event; |
491 | int ret; | |
492 | ||
493 | rw |= (1 << BIO_RW_SYNC); | |
494 | ||
495 | bio->bi_bdev = bdev; | |
496 | bio->bi_sector = sector; | |
497 | bio_add_page(bio, page, size, 0); | |
498 | init_completion(&event); | |
499 | bio->bi_private = &event; | |
500 | bio->bi_end_io = bi_complete; | |
501 | submit_bio(rw, bio); | |
502 | wait_for_completion(&event); | |
503 | ||
504 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
505 | bio_put(bio); | |
506 | return ret; | |
507 | } | |
a8745db2 | 508 | EXPORT_SYMBOL_GPL(sync_page_io); |
1da177e4 | 509 | |
0002b271 | 510 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
511 | { |
512 | char b[BDEVNAME_SIZE]; | |
513 | if (!rdev->sb_page) { | |
514 | MD_BUG(); | |
515 | return -EINVAL; | |
516 | } | |
517 | if (rdev->sb_loaded) | |
518 | return 0; | |
519 | ||
520 | ||
0002b271 | 521 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
522 | goto fail; |
523 | rdev->sb_loaded = 1; | |
524 | return 0; | |
525 | ||
526 | fail: | |
527 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
528 | bdevname(rdev->bdev,b)); | |
529 | return -EINVAL; | |
530 | } | |
531 | ||
532 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
533 | { | |
534 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
535 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
536 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
537 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
538 | ||
539 | return 1; | |
540 | ||
541 | return 0; | |
542 | } | |
543 | ||
544 | ||
545 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
546 | { | |
547 | int ret; | |
548 | mdp_super_t *tmp1, *tmp2; | |
549 | ||
550 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
551 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
552 | ||
553 | if (!tmp1 || !tmp2) { | |
554 | ret = 0; | |
555 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
556 | goto abort; | |
557 | } | |
558 | ||
559 | *tmp1 = *sb1; | |
560 | *tmp2 = *sb2; | |
561 | ||
562 | /* | |
563 | * nr_disks is not constant | |
564 | */ | |
565 | tmp1->nr_disks = 0; | |
566 | tmp2->nr_disks = 0; | |
567 | ||
568 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
569 | ret = 0; | |
570 | else | |
571 | ret = 1; | |
572 | ||
573 | abort: | |
990a8baf JJ |
574 | kfree(tmp1); |
575 | kfree(tmp2); | |
1da177e4 LT |
576 | return ret; |
577 | } | |
578 | ||
579 | static unsigned int calc_sb_csum(mdp_super_t * sb) | |
580 | { | |
581 | unsigned int disk_csum, csum; | |
582 | ||
583 | disk_csum = sb->sb_csum; | |
584 | sb->sb_csum = 0; | |
585 | csum = csum_partial((void *)sb, MD_SB_BYTES, 0); | |
586 | sb->sb_csum = disk_csum; | |
587 | return csum; | |
588 | } | |
589 | ||
590 | ||
591 | /* | |
592 | * Handle superblock details. | |
593 | * We want to be able to handle multiple superblock formats | |
594 | * so we have a common interface to them all, and an array of | |
595 | * different handlers. | |
596 | * We rely on user-space to write the initial superblock, and support | |
597 | * reading and updating of superblocks. | |
598 | * Interface methods are: | |
599 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
600 | * loads and validates a superblock on dev. | |
601 | * if refdev != NULL, compare superblocks on both devices | |
602 | * Return: | |
603 | * 0 - dev has a superblock that is compatible with refdev | |
604 | * 1 - dev has a superblock that is compatible and newer than refdev | |
605 | * so dev should be used as the refdev in future | |
606 | * -EINVAL superblock incompatible or invalid | |
607 | * -othererror e.g. -EIO | |
608 | * | |
609 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
610 | * Verify that dev is acceptable into mddev. | |
611 | * The first time, mddev->raid_disks will be 0, and data from | |
612 | * dev should be merged in. Subsequent calls check that dev | |
613 | * is new enough. Return 0 or -EINVAL | |
614 | * | |
615 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
616 | * Update the superblock for rdev with data in mddev | |
617 | * This does not write to disc. | |
618 | * | |
619 | */ | |
620 | ||
621 | struct super_type { | |
622 | char *name; | |
623 | struct module *owner; | |
624 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
625 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
626 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
627 | }; | |
628 | ||
629 | /* | |
630 | * load_super for 0.90.0 | |
631 | */ | |
632 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
633 | { | |
634 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
635 | mdp_super_t *sb; | |
636 | int ret; | |
637 | sector_t sb_offset; | |
638 | ||
639 | /* | |
640 | * Calculate the position of the superblock, | |
641 | * it's at the end of the disk. | |
642 | * | |
643 | * It also happens to be a multiple of 4Kb. | |
644 | */ | |
645 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
646 | rdev->sb_offset = sb_offset; | |
647 | ||
0002b271 | 648 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
649 | if (ret) return ret; |
650 | ||
651 | ret = -EINVAL; | |
652 | ||
653 | bdevname(rdev->bdev, b); | |
654 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
655 | ||
656 | if (sb->md_magic != MD_SB_MAGIC) { | |
657 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
658 | b); | |
659 | goto abort; | |
660 | } | |
661 | ||
662 | if (sb->major_version != 0 || | |
663 | sb->minor_version != 90) { | |
664 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", | |
665 | sb->major_version, sb->minor_version, | |
666 | b); | |
667 | goto abort; | |
668 | } | |
669 | ||
670 | if (sb->raid_disks <= 0) | |
671 | goto abort; | |
672 | ||
673 | if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) { | |
674 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", | |
675 | b); | |
676 | goto abort; | |
677 | } | |
678 | ||
679 | rdev->preferred_minor = sb->md_minor; | |
680 | rdev->data_offset = 0; | |
0002b271 | 681 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
682 | |
683 | if (sb->level == LEVEL_MULTIPATH) | |
684 | rdev->desc_nr = -1; | |
685 | else | |
686 | rdev->desc_nr = sb->this_disk.number; | |
687 | ||
688 | if (refdev == 0) | |
689 | ret = 1; | |
690 | else { | |
691 | __u64 ev1, ev2; | |
692 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
693 | if (!uuid_equal(refsb, sb)) { | |
694 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
695 | b, bdevname(refdev->bdev,b2)); | |
696 | goto abort; | |
697 | } | |
698 | if (!sb_equal(refsb, sb)) { | |
699 | printk(KERN_WARNING "md: %s has same UUID" | |
700 | " but different superblock to %s\n", | |
701 | b, bdevname(refdev->bdev, b2)); | |
702 | goto abort; | |
703 | } | |
704 | ev1 = md_event(sb); | |
705 | ev2 = md_event(refsb); | |
706 | if (ev1 > ev2) | |
707 | ret = 1; | |
708 | else | |
709 | ret = 0; | |
710 | } | |
711 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
712 | ||
2bf071bf N |
713 | if (rdev->size < sb->size && sb->level > 1) |
714 | /* "this cannot possibly happen" ... */ | |
715 | ret = -EINVAL; | |
716 | ||
1da177e4 LT |
717 | abort: |
718 | return ret; | |
719 | } | |
720 | ||
721 | /* | |
722 | * validate_super for 0.90.0 | |
723 | */ | |
724 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
725 | { | |
726 | mdp_disk_t *desc; | |
727 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
728 | ||
41158c7e | 729 | rdev->raid_disk = -1; |
b2d444d7 | 730 | rdev->flags = 0; |
1da177e4 LT |
731 | if (mddev->raid_disks == 0) { |
732 | mddev->major_version = 0; | |
733 | mddev->minor_version = sb->minor_version; | |
734 | mddev->patch_version = sb->patch_version; | |
735 | mddev->persistent = ! sb->not_persistent; | |
736 | mddev->chunk_size = sb->chunk_size; | |
737 | mddev->ctime = sb->ctime; | |
738 | mddev->utime = sb->utime; | |
739 | mddev->level = sb->level; | |
d9d166c2 | 740 | mddev->clevel[0] = 0; |
1da177e4 LT |
741 | mddev->layout = sb->layout; |
742 | mddev->raid_disks = sb->raid_disks; | |
743 | mddev->size = sb->size; | |
744 | mddev->events = md_event(sb); | |
9223214e | 745 | mddev->bitmap_offset = 0; |
36fa3063 | 746 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 LT |
747 | |
748 | if (sb->state & (1<<MD_SB_CLEAN)) | |
749 | mddev->recovery_cp = MaxSector; | |
750 | else { | |
751 | if (sb->events_hi == sb->cp_events_hi && | |
752 | sb->events_lo == sb->cp_events_lo) { | |
753 | mddev->recovery_cp = sb->recovery_cp; | |
754 | } else | |
755 | mddev->recovery_cp = 0; | |
756 | } | |
757 | ||
758 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
759 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
760 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
761 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
762 | ||
763 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
764 | |
765 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
766 | mddev->bitmap_file == NULL) { | |
6cce3b23 N |
767 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 |
768 | && mddev->level != 10) { | |
a654b9d8 | 769 | /* FIXME use a better test */ |
6cce3b23 | 770 | printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); |
a654b9d8 N |
771 | return -EINVAL; |
772 | } | |
36fa3063 | 773 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 N |
774 | } |
775 | ||
41158c7e N |
776 | } else if (mddev->pers == NULL) { |
777 | /* Insist on good event counter while assembling */ | |
778 | __u64 ev1 = md_event(sb); | |
1da177e4 LT |
779 | ++ev1; |
780 | if (ev1 < mddev->events) | |
781 | return -EINVAL; | |
41158c7e N |
782 | } else if (mddev->bitmap) { |
783 | /* if adding to array with a bitmap, then we can accept an | |
784 | * older device ... but not too old. | |
785 | */ | |
786 | __u64 ev1 = md_event(sb); | |
787 | if (ev1 < mddev->bitmap->events_cleared) | |
788 | return 0; | |
789 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
790 | return 0; | |
791 | ||
1da177e4 | 792 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
793 | desc = sb->disks + rdev->desc_nr; |
794 | ||
795 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 796 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
797 | else if (desc->state & (1<<MD_DISK_SYNC) && |
798 | desc->raid_disk < mddev->raid_disks) { | |
b2d444d7 | 799 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
800 | rdev->raid_disk = desc->raid_disk; |
801 | } | |
8ddf9efe N |
802 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
803 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 804 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 805 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
806 | return 0; |
807 | } | |
808 | ||
809 | /* | |
810 | * sync_super for 0.90.0 | |
811 | */ | |
812 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
813 | { | |
814 | mdp_super_t *sb; | |
815 | struct list_head *tmp; | |
816 | mdk_rdev_t *rdev2; | |
817 | int next_spare = mddev->raid_disks; | |
19133a42 | 818 | |
1da177e4 LT |
819 | |
820 | /* make rdev->sb match mddev data.. | |
821 | * | |
822 | * 1/ zero out disks | |
823 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
824 | * 3/ any empty disks < next_spare become removed | |
825 | * | |
826 | * disks[0] gets initialised to REMOVED because | |
827 | * we cannot be sure from other fields if it has | |
828 | * been initialised or not. | |
829 | */ | |
830 | int i; | |
831 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
832 | ||
61181565 N |
833 | rdev->sb_size = MD_SB_BYTES; |
834 | ||
1da177e4 LT |
835 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
836 | ||
837 | memset(sb, 0, sizeof(*sb)); | |
838 | ||
839 | sb->md_magic = MD_SB_MAGIC; | |
840 | sb->major_version = mddev->major_version; | |
841 | sb->minor_version = mddev->minor_version; | |
842 | sb->patch_version = mddev->patch_version; | |
843 | sb->gvalid_words = 0; /* ignored */ | |
844 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
845 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
846 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
847 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
848 | ||
849 | sb->ctime = mddev->ctime; | |
850 | sb->level = mddev->level; | |
851 | sb->size = mddev->size; | |
852 | sb->raid_disks = mddev->raid_disks; | |
853 | sb->md_minor = mddev->md_minor; | |
854 | sb->not_persistent = !mddev->persistent; | |
855 | sb->utime = mddev->utime; | |
856 | sb->state = 0; | |
857 | sb->events_hi = (mddev->events>>32); | |
858 | sb->events_lo = (u32)mddev->events; | |
859 | ||
860 | if (mddev->in_sync) | |
861 | { | |
862 | sb->recovery_cp = mddev->recovery_cp; | |
863 | sb->cp_events_hi = (mddev->events>>32); | |
864 | sb->cp_events_lo = (u32)mddev->events; | |
865 | if (mddev->recovery_cp == MaxSector) | |
866 | sb->state = (1<< MD_SB_CLEAN); | |
867 | } else | |
868 | sb->recovery_cp = 0; | |
869 | ||
870 | sb->layout = mddev->layout; | |
871 | sb->chunk_size = mddev->chunk_size; | |
872 | ||
a654b9d8 N |
873 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
874 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
875 | ||
1da177e4 LT |
876 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
877 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
878 | mdp_disk_t *d; | |
86e6ffdd | 879 | int desc_nr; |
b2d444d7 N |
880 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
881 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 882 | desc_nr = rdev2->raid_disk; |
1da177e4 | 883 | else |
86e6ffdd | 884 | desc_nr = next_spare++; |
19133a42 | 885 | rdev2->desc_nr = desc_nr; |
1da177e4 LT |
886 | d = &sb->disks[rdev2->desc_nr]; |
887 | nr_disks++; | |
888 | d->number = rdev2->desc_nr; | |
889 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
890 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
891 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
892 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
893 | d->raid_disk = rdev2->raid_disk; |
894 | else | |
895 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
b2d444d7 | 896 | if (test_bit(Faulty, &rdev2->flags)) { |
1da177e4 LT |
897 | d->state = (1<<MD_DISK_FAULTY); |
898 | failed++; | |
b2d444d7 | 899 | } else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
900 | d->state = (1<<MD_DISK_ACTIVE); |
901 | d->state |= (1<<MD_DISK_SYNC); | |
902 | active++; | |
903 | working++; | |
904 | } else { | |
905 | d->state = 0; | |
906 | spare++; | |
907 | working++; | |
908 | } | |
8ddf9efe N |
909 | if (test_bit(WriteMostly, &rdev2->flags)) |
910 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 911 | } |
1da177e4 LT |
912 | /* now set the "removed" and "faulty" bits on any missing devices */ |
913 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
914 | mdp_disk_t *d = &sb->disks[i]; | |
915 | if (d->state == 0 && d->number == 0) { | |
916 | d->number = i; | |
917 | d->raid_disk = i; | |
918 | d->state = (1<<MD_DISK_REMOVED); | |
919 | d->state |= (1<<MD_DISK_FAULTY); | |
920 | failed++; | |
921 | } | |
922 | } | |
923 | sb->nr_disks = nr_disks; | |
924 | sb->active_disks = active; | |
925 | sb->working_disks = working; | |
926 | sb->failed_disks = failed; | |
927 | sb->spare_disks = spare; | |
928 | ||
929 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
930 | sb->sb_csum = calc_sb_csum(sb); | |
931 | } | |
932 | ||
933 | /* | |
934 | * version 1 superblock | |
935 | */ | |
936 | ||
937 | static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) | |
938 | { | |
939 | unsigned int disk_csum, csum; | |
940 | unsigned long long newcsum; | |
941 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
942 | unsigned int *isuper = (unsigned int*)sb; | |
943 | int i; | |
944 | ||
945 | disk_csum = sb->sb_csum; | |
946 | sb->sb_csum = 0; | |
947 | newcsum = 0; | |
948 | for (i=0; size>=4; size -= 4 ) | |
949 | newcsum += le32_to_cpu(*isuper++); | |
950 | ||
951 | if (size == 2) | |
952 | newcsum += le16_to_cpu(*(unsigned short*) isuper); | |
953 | ||
954 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
955 | sb->sb_csum = disk_csum; | |
956 | return cpu_to_le32(csum); | |
957 | } | |
958 | ||
959 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
960 | { | |
961 | struct mdp_superblock_1 *sb; | |
962 | int ret; | |
963 | sector_t sb_offset; | |
964 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 965 | int bmask; |
1da177e4 LT |
966 | |
967 | /* | |
968 | * Calculate the position of the superblock. | |
969 | * It is always aligned to a 4K boundary and | |
970 | * depeding on minor_version, it can be: | |
971 | * 0: At least 8K, but less than 12K, from end of device | |
972 | * 1: At start of device | |
973 | * 2: 4K from start of device. | |
974 | */ | |
975 | switch(minor_version) { | |
976 | case 0: | |
977 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
978 | sb_offset -= 8*2; | |
39730960 | 979 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
980 | /* convert from sectors to K */ |
981 | sb_offset /= 2; | |
982 | break; | |
983 | case 1: | |
984 | sb_offset = 0; | |
985 | break; | |
986 | case 2: | |
987 | sb_offset = 4; | |
988 | break; | |
989 | default: | |
990 | return -EINVAL; | |
991 | } | |
992 | rdev->sb_offset = sb_offset; | |
993 | ||
0002b271 N |
994 | /* superblock is rarely larger than 1K, but it can be larger, |
995 | * and it is safe to read 4k, so we do that | |
996 | */ | |
997 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
998 | if (ret) return ret; |
999 | ||
1000 | ||
1001 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1002 | ||
1003 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
1004 | sb->major_version != cpu_to_le32(1) || | |
1005 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
1006 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 1007 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
1008 | return -EINVAL; |
1009 | ||
1010 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
1011 | printk("md: invalid superblock checksum on %s\n", | |
1012 | bdevname(rdev->bdev,b)); | |
1013 | return -EINVAL; | |
1014 | } | |
1015 | if (le64_to_cpu(sb->data_size) < 10) { | |
1016 | printk("md: data_size too small on %s\n", | |
1017 | bdevname(rdev->bdev,b)); | |
1018 | return -EINVAL; | |
1019 | } | |
1020 | rdev->preferred_minor = 0xffff; | |
1021 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
4dbcdc75 | 1022 | atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read)); |
1da177e4 | 1023 | |
0002b271 | 1024 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 1025 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 N |
1026 | if (rdev->sb_size & bmask) |
1027 | rdev-> sb_size = (rdev->sb_size | bmask)+1; | |
1028 | ||
1da177e4 | 1029 | if (refdev == 0) |
8ed75463 | 1030 | ret = 1; |
1da177e4 LT |
1031 | else { |
1032 | __u64 ev1, ev2; | |
1033 | struct mdp_superblock_1 *refsb = | |
1034 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
1035 | ||
1036 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
1037 | sb->level != refsb->level || | |
1038 | sb->layout != refsb->layout || | |
1039 | sb->chunksize != refsb->chunksize) { | |
1040 | printk(KERN_WARNING "md: %s has strangely different" | |
1041 | " superblock to %s\n", | |
1042 | bdevname(rdev->bdev,b), | |
1043 | bdevname(refdev->bdev,b2)); | |
1044 | return -EINVAL; | |
1045 | } | |
1046 | ev1 = le64_to_cpu(sb->events); | |
1047 | ev2 = le64_to_cpu(refsb->events); | |
1048 | ||
1049 | if (ev1 > ev2) | |
8ed75463 N |
1050 | ret = 1; |
1051 | else | |
1052 | ret = 0; | |
1da177e4 LT |
1053 | } |
1054 | if (minor_version) | |
1055 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; | |
1056 | else | |
1057 | rdev->size = rdev->sb_offset; | |
1058 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
1059 | return -EINVAL; | |
1060 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
1061 | if (le32_to_cpu(sb->chunksize)) | |
1062 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
2bf071bf N |
1063 | |
1064 | if (le32_to_cpu(sb->size) > rdev->size*2) | |
1065 | return -EINVAL; | |
8ed75463 | 1066 | return ret; |
1da177e4 LT |
1067 | } |
1068 | ||
1069 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
1070 | { | |
1071 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1072 | ||
41158c7e | 1073 | rdev->raid_disk = -1; |
b2d444d7 | 1074 | rdev->flags = 0; |
1da177e4 LT |
1075 | if (mddev->raid_disks == 0) { |
1076 | mddev->major_version = 1; | |
1077 | mddev->patch_version = 0; | |
1078 | mddev->persistent = 1; | |
1079 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; | |
1080 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
1081 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
1082 | mddev->level = le32_to_cpu(sb->level); | |
d9d166c2 | 1083 | mddev->clevel[0] = 0; |
1da177e4 LT |
1084 | mddev->layout = le32_to_cpu(sb->layout); |
1085 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
1086 | mddev->size = le64_to_cpu(sb->size)/2; | |
1087 | mddev->events = le64_to_cpu(sb->events); | |
9223214e | 1088 | mddev->bitmap_offset = 0; |
29fc7e3e | 1089 | mddev->default_bitmap_offset = 1024 >> 9; |
1da177e4 LT |
1090 | |
1091 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
1092 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
1093 | ||
1094 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 1095 | |
71c0805c | 1096 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
a654b9d8 | 1097 | mddev->bitmap_file == NULL ) { |
6cce3b23 N |
1098 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6 |
1099 | && mddev->level != 10) { | |
1100 | printk(KERN_WARNING "md: bitmaps not supported for this level.\n"); | |
a654b9d8 N |
1101 | return -EINVAL; |
1102 | } | |
1103 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); | |
1104 | } | |
41158c7e N |
1105 | } else if (mddev->pers == NULL) { |
1106 | /* Insist of good event counter while assembling */ | |
1107 | __u64 ev1 = le64_to_cpu(sb->events); | |
1da177e4 LT |
1108 | ++ev1; |
1109 | if (ev1 < mddev->events) | |
1110 | return -EINVAL; | |
41158c7e N |
1111 | } else if (mddev->bitmap) { |
1112 | /* If adding to array with a bitmap, then we can accept an | |
1113 | * older device, but not too old. | |
1114 | */ | |
1115 | __u64 ev1 = le64_to_cpu(sb->events); | |
1116 | if (ev1 < mddev->bitmap->events_cleared) | |
1117 | return 0; | |
1118 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1119 | return 0; | |
1da177e4 LT |
1120 | |
1121 | if (mddev->level != LEVEL_MULTIPATH) { | |
1122 | int role; | |
1123 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1124 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1125 | switch(role) { | |
1126 | case 0xffff: /* spare */ | |
1da177e4 LT |
1127 | break; |
1128 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1129 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1130 | break; |
1131 | default: | |
b2d444d7 | 1132 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1133 | rdev->raid_disk = role; |
1134 | break; | |
1135 | } | |
8ddf9efe N |
1136 | if (sb->devflags & WriteMostly1) |
1137 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1138 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1139 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1140 | |
1da177e4 LT |
1141 | return 0; |
1142 | } | |
1143 | ||
1144 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1145 | { | |
1146 | struct mdp_superblock_1 *sb; | |
1147 | struct list_head *tmp; | |
1148 | mdk_rdev_t *rdev2; | |
1149 | int max_dev, i; | |
1150 | /* make rdev->sb match mddev and rdev data. */ | |
1151 | ||
1152 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1153 | ||
1154 | sb->feature_map = 0; | |
1155 | sb->pad0 = 0; | |
1156 | memset(sb->pad1, 0, sizeof(sb->pad1)); | |
1157 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1158 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1159 | ||
1160 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1161 | sb->events = cpu_to_le64(mddev->events); | |
1162 | if (mddev->in_sync) | |
1163 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1164 | else | |
1165 | sb->resync_offset = cpu_to_le64(0); | |
1166 | ||
4dbcdc75 N |
1167 | sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors); |
1168 | ||
f0ca340c | 1169 | sb->raid_disks = cpu_to_le32(mddev->raid_disks); |
29fc7e3e | 1170 | sb->size = cpu_to_le64(mddev->size<<1); |
f0ca340c | 1171 | |
a654b9d8 N |
1172 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1173 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1174 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 N |
1175 | } |
1176 | ||
1da177e4 LT |
1177 | max_dev = 0; |
1178 | ITERATE_RDEV(mddev,rdev2,tmp) | |
1179 | if (rdev2->desc_nr+1 > max_dev) | |
1180 | max_dev = rdev2->desc_nr+1; | |
1181 | ||
1182 | sb->max_dev = cpu_to_le32(max_dev); | |
1183 | for (i=0; i<max_dev;i++) | |
1184 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1185 | ||
1186 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
1187 | i = rdev2->desc_nr; | |
b2d444d7 | 1188 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1189 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1190 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 LT |
1191 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1192 | else | |
1193 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1194 | } | |
1195 | ||
1196 | sb->recovery_offset = cpu_to_le64(0); /* not supported yet */ | |
1197 | sb->sb_csum = calc_sb_1_csum(sb); | |
1198 | } | |
1199 | ||
1200 | ||
75c96f85 | 1201 | static struct super_type super_types[] = { |
1da177e4 LT |
1202 | [0] = { |
1203 | .name = "0.90.0", | |
1204 | .owner = THIS_MODULE, | |
1205 | .load_super = super_90_load, | |
1206 | .validate_super = super_90_validate, | |
1207 | .sync_super = super_90_sync, | |
1208 | }, | |
1209 | [1] = { | |
1210 | .name = "md-1", | |
1211 | .owner = THIS_MODULE, | |
1212 | .load_super = super_1_load, | |
1213 | .validate_super = super_1_validate, | |
1214 | .sync_super = super_1_sync, | |
1215 | }, | |
1216 | }; | |
1217 | ||
1218 | static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) | |
1219 | { | |
1220 | struct list_head *tmp; | |
1221 | mdk_rdev_t *rdev; | |
1222 | ||
1223 | ITERATE_RDEV(mddev,rdev,tmp) | |
1224 | if (rdev->bdev->bd_contains == dev->bdev->bd_contains) | |
1225 | return rdev; | |
1226 | ||
1227 | return NULL; | |
1228 | } | |
1229 | ||
1230 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1231 | { | |
1232 | struct list_head *tmp; | |
1233 | mdk_rdev_t *rdev; | |
1234 | ||
1235 | ITERATE_RDEV(mddev1,rdev,tmp) | |
1236 | if (match_dev_unit(mddev2, rdev)) | |
1237 | return 1; | |
1238 | ||
1239 | return 0; | |
1240 | } | |
1241 | ||
1242 | static LIST_HEAD(pending_raid_disks); | |
1243 | ||
1244 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1245 | { | |
1246 | mdk_rdev_t *same_pdev; | |
1247 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
f637b9f9 | 1248 | struct kobject *ko; |
1edf80d3 | 1249 | char *s; |
1da177e4 LT |
1250 | |
1251 | if (rdev->mddev) { | |
1252 | MD_BUG(); | |
1253 | return -EINVAL; | |
1254 | } | |
2bf071bf N |
1255 | /* make sure rdev->size exceeds mddev->size */ |
1256 | if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) { | |
1257 | if (mddev->pers) | |
1258 | /* Cannot change size, so fail */ | |
1259 | return -ENOSPC; | |
1260 | else | |
1261 | mddev->size = rdev->size; | |
1262 | } | |
1da177e4 LT |
1263 | same_pdev = match_dev_unit(mddev, rdev); |
1264 | if (same_pdev) | |
1265 | printk(KERN_WARNING | |
1266 | "%s: WARNING: %s appears to be on the same physical" | |
1267 | " disk as %s. True\n protection against single-disk" | |
1268 | " failure might be compromised.\n", | |
1269 | mdname(mddev), bdevname(rdev->bdev,b), | |
1270 | bdevname(same_pdev->bdev,b2)); | |
1271 | ||
1272 | /* Verify rdev->desc_nr is unique. | |
1273 | * If it is -1, assign a free number, else | |
1274 | * check number is not in use | |
1275 | */ | |
1276 | if (rdev->desc_nr < 0) { | |
1277 | int choice = 0; | |
1278 | if (mddev->pers) choice = mddev->raid_disks; | |
1279 | while (find_rdev_nr(mddev, choice)) | |
1280 | choice++; | |
1281 | rdev->desc_nr = choice; | |
1282 | } else { | |
1283 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1284 | return -EBUSY; | |
1285 | } | |
19133a42 N |
1286 | bdevname(rdev->bdev,b); |
1287 | if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0) | |
1288 | return -ENOMEM; | |
1edf80d3 NB |
1289 | while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL) |
1290 | *s = '!'; | |
1da177e4 LT |
1291 | |
1292 | list_add(&rdev->same_set, &mddev->disks); | |
1293 | rdev->mddev = mddev; | |
19133a42 | 1294 | printk(KERN_INFO "md: bind<%s>\n", b); |
86e6ffdd | 1295 | |
9c791977 | 1296 | rdev->kobj.parent = &mddev->kobj; |
86e6ffdd N |
1297 | kobject_add(&rdev->kobj); |
1298 | ||
f637b9f9 N |
1299 | if (rdev->bdev->bd_part) |
1300 | ko = &rdev->bdev->bd_part->kobj; | |
1301 | else | |
1302 | ko = &rdev->bdev->bd_disk->kobj; | |
1303 | sysfs_create_link(&rdev->kobj, ko, "block"); | |
1da177e4 LT |
1304 | return 0; |
1305 | } | |
1306 | ||
1307 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) | |
1308 | { | |
1309 | char b[BDEVNAME_SIZE]; | |
1310 | if (!rdev->mddev) { | |
1311 | MD_BUG(); | |
1312 | return; | |
1313 | } | |
1314 | list_del_init(&rdev->same_set); | |
1315 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1316 | rdev->mddev = NULL; | |
86e6ffdd N |
1317 | sysfs_remove_link(&rdev->kobj, "block"); |
1318 | kobject_del(&rdev->kobj); | |
1da177e4 LT |
1319 | } |
1320 | ||
1321 | /* | |
1322 | * prevent the device from being mounted, repartitioned or | |
1323 | * otherwise reused by a RAID array (or any other kernel | |
1324 | * subsystem), by bd_claiming the device. | |
1325 | */ | |
1326 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) | |
1327 | { | |
1328 | int err = 0; | |
1329 | struct block_device *bdev; | |
1330 | char b[BDEVNAME_SIZE]; | |
1331 | ||
1332 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
1333 | if (IS_ERR(bdev)) { | |
1334 | printk(KERN_ERR "md: could not open %s.\n", | |
1335 | __bdevname(dev, b)); | |
1336 | return PTR_ERR(bdev); | |
1337 | } | |
1338 | err = bd_claim(bdev, rdev); | |
1339 | if (err) { | |
1340 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1341 | bdevname(bdev, b)); | |
1342 | blkdev_put(bdev); | |
1343 | return err; | |
1344 | } | |
1345 | rdev->bdev = bdev; | |
1346 | return err; | |
1347 | } | |
1348 | ||
1349 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1350 | { | |
1351 | struct block_device *bdev = rdev->bdev; | |
1352 | rdev->bdev = NULL; | |
1353 | if (!bdev) | |
1354 | MD_BUG(); | |
1355 | bd_release(bdev); | |
1356 | blkdev_put(bdev); | |
1357 | } | |
1358 | ||
1359 | void md_autodetect_dev(dev_t dev); | |
1360 | ||
1361 | static void export_rdev(mdk_rdev_t * rdev) | |
1362 | { | |
1363 | char b[BDEVNAME_SIZE]; | |
1364 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1365 | bdevname(rdev->bdev,b)); | |
1366 | if (rdev->mddev) | |
1367 | MD_BUG(); | |
1368 | free_disk_sb(rdev); | |
1369 | list_del_init(&rdev->same_set); | |
1370 | #ifndef MODULE | |
1371 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1372 | #endif | |
1373 | unlock_rdev(rdev); | |
86e6ffdd | 1374 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1375 | } |
1376 | ||
1377 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1378 | { | |
1379 | unbind_rdev_from_array(rdev); | |
1380 | export_rdev(rdev); | |
1381 | } | |
1382 | ||
1383 | static void export_array(mddev_t *mddev) | |
1384 | { | |
1385 | struct list_head *tmp; | |
1386 | mdk_rdev_t *rdev; | |
1387 | ||
1388 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1389 | if (!rdev->mddev) { | |
1390 | MD_BUG(); | |
1391 | continue; | |
1392 | } | |
1393 | kick_rdev_from_array(rdev); | |
1394 | } | |
1395 | if (!list_empty(&mddev->disks)) | |
1396 | MD_BUG(); | |
1397 | mddev->raid_disks = 0; | |
1398 | mddev->major_version = 0; | |
1399 | } | |
1400 | ||
1401 | static void print_desc(mdp_disk_t *desc) | |
1402 | { | |
1403 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1404 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1405 | } | |
1406 | ||
1407 | static void print_sb(mdp_super_t *sb) | |
1408 | { | |
1409 | int i; | |
1410 | ||
1411 | printk(KERN_INFO | |
1412 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1413 | sb->major_version, sb->minor_version, sb->patch_version, | |
1414 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1415 | sb->ctime); | |
1416 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1417 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1418 | sb->md_minor, sb->layout, sb->chunk_size); | |
1419 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1420 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1421 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1422 | sb->failed_disks, sb->spare_disks, | |
1423 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1424 | ||
1425 | printk(KERN_INFO); | |
1426 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1427 | mdp_disk_t *desc; | |
1428 | ||
1429 | desc = sb->disks + i; | |
1430 | if (desc->number || desc->major || desc->minor || | |
1431 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1432 | printk(" D %2d: ", i); | |
1433 | print_desc(desc); | |
1434 | } | |
1435 | } | |
1436 | printk(KERN_INFO "md: THIS: "); | |
1437 | print_desc(&sb->this_disk); | |
1438 | ||
1439 | } | |
1440 | ||
1441 | static void print_rdev(mdk_rdev_t *rdev) | |
1442 | { | |
1443 | char b[BDEVNAME_SIZE]; | |
1444 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1445 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1446 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1447 | rdev->desc_nr); | |
1da177e4 LT |
1448 | if (rdev->sb_loaded) { |
1449 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1450 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1451 | } else | |
1452 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1453 | } | |
1454 | ||
1455 | void md_print_devices(void) | |
1456 | { | |
1457 | struct list_head *tmp, *tmp2; | |
1458 | mdk_rdev_t *rdev; | |
1459 | mddev_t *mddev; | |
1460 | char b[BDEVNAME_SIZE]; | |
1461 | ||
1462 | printk("\n"); | |
1463 | printk("md: **********************************\n"); | |
1464 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1465 | printk("md: **********************************\n"); | |
1466 | ITERATE_MDDEV(mddev,tmp) { | |
1da177e4 | 1467 | |
32a7627c N |
1468 | if (mddev->bitmap) |
1469 | bitmap_print_sb(mddev->bitmap); | |
1470 | else | |
1471 | printk("%s: ", mdname(mddev)); | |
1da177e4 LT |
1472 | ITERATE_RDEV(mddev,rdev,tmp2) |
1473 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1474 | printk("\n"); | |
1475 | ||
1476 | ITERATE_RDEV(mddev,rdev,tmp2) | |
1477 | print_rdev(rdev); | |
1478 | } | |
1479 | printk("md: **********************************\n"); | |
1480 | printk("\n"); | |
1481 | } | |
1482 | ||
1483 | ||
1da177e4 LT |
1484 | static void sync_sbs(mddev_t * mddev) |
1485 | { | |
1486 | mdk_rdev_t *rdev; | |
1487 | struct list_head *tmp; | |
1488 | ||
1489 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1490 | super_types[mddev->major_version]. | |
1491 | sync_super(mddev, rdev); | |
1492 | rdev->sb_loaded = 1; | |
1493 | } | |
1494 | } | |
1495 | ||
1496 | static void md_update_sb(mddev_t * mddev) | |
1497 | { | |
7bfa19f2 | 1498 | int err; |
1da177e4 LT |
1499 | struct list_head *tmp; |
1500 | mdk_rdev_t *rdev; | |
06d91a5f | 1501 | int sync_req; |
1da177e4 | 1502 | |
1da177e4 | 1503 | repeat: |
a9701a30 | 1504 | spin_lock_irq(&mddev->write_lock); |
06d91a5f | 1505 | sync_req = mddev->in_sync; |
1da177e4 LT |
1506 | mddev->utime = get_seconds(); |
1507 | mddev->events ++; | |
1508 | ||
1509 | if (!mddev->events) { | |
1510 | /* | |
1511 | * oops, this 64-bit counter should never wrap. | |
1512 | * Either we are in around ~1 trillion A.C., assuming | |
1513 | * 1 reboot per second, or we have a bug: | |
1514 | */ | |
1515 | MD_BUG(); | |
1516 | mddev->events --; | |
1517 | } | |
7bfa19f2 | 1518 | mddev->sb_dirty = 2; |
1da177e4 LT |
1519 | sync_sbs(mddev); |
1520 | ||
1521 | /* | |
1522 | * do not write anything to disk if using | |
1523 | * nonpersistent superblocks | |
1524 | */ | |
06d91a5f N |
1525 | if (!mddev->persistent) { |
1526 | mddev->sb_dirty = 0; | |
a9701a30 | 1527 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1528 | wake_up(&mddev->sb_wait); |
1da177e4 | 1529 | return; |
06d91a5f | 1530 | } |
a9701a30 | 1531 | spin_unlock_irq(&mddev->write_lock); |
1da177e4 LT |
1532 | |
1533 | dprintk(KERN_INFO | |
1534 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1535 | mdname(mddev),mddev->in_sync); | |
1536 | ||
32a7627c | 1537 | err = bitmap_update_sb(mddev->bitmap); |
1da177e4 LT |
1538 | ITERATE_RDEV(mddev,rdev,tmp) { |
1539 | char b[BDEVNAME_SIZE]; | |
1540 | dprintk(KERN_INFO "md: "); | |
b2d444d7 | 1541 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1542 | dprintk("(skipping faulty "); |
1543 | ||
1544 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1545 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1546 | md_super_write(mddev,rdev, |
0002b271 | 1547 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1548 | rdev->sb_page); |
1549 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1550 | bdevname(rdev->bdev,b), | |
1551 | (unsigned long long)rdev->sb_offset); | |
1552 | ||
1da177e4 LT |
1553 | } else |
1554 | dprintk(")\n"); | |
7bfa19f2 | 1555 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1556 | /* only need to write one superblock... */ |
1557 | break; | |
1558 | } | |
a9701a30 | 1559 | md_super_wait(mddev); |
7bfa19f2 N |
1560 | /* if there was a failure, sb_dirty was set to 1, and we re-write super */ |
1561 | ||
a9701a30 | 1562 | spin_lock_irq(&mddev->write_lock); |
7bfa19f2 | 1563 | if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { |
06d91a5f | 1564 | /* have to write it out again */ |
a9701a30 | 1565 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f N |
1566 | goto repeat; |
1567 | } | |
1568 | mddev->sb_dirty = 0; | |
a9701a30 | 1569 | spin_unlock_irq(&mddev->write_lock); |
3d310eb7 | 1570 | wake_up(&mddev->sb_wait); |
06d91a5f | 1571 | |
1da177e4 LT |
1572 | } |
1573 | ||
bce74dac N |
1574 | /* words written to sysfs files may, or my not, be \n terminated. |
1575 | * We want to accept with case. For this we use cmd_match. | |
1576 | */ | |
1577 | static int cmd_match(const char *cmd, const char *str) | |
1578 | { | |
1579 | /* See if cmd, written into a sysfs file, matches | |
1580 | * str. They must either be the same, or cmd can | |
1581 | * have a trailing newline | |
1582 | */ | |
1583 | while (*cmd && *str && *cmd == *str) { | |
1584 | cmd++; | |
1585 | str++; | |
1586 | } | |
1587 | if (*cmd == '\n') | |
1588 | cmd++; | |
1589 | if (*str || *cmd) | |
1590 | return 0; | |
1591 | return 1; | |
1592 | } | |
1593 | ||
86e6ffdd N |
1594 | struct rdev_sysfs_entry { |
1595 | struct attribute attr; | |
1596 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1597 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1598 | }; | |
1599 | ||
1600 | static ssize_t | |
96de1e66 | 1601 | state_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1602 | { |
1603 | char *sep = ""; | |
1604 | int len=0; | |
1605 | ||
b2d444d7 | 1606 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1607 | len+= sprintf(page+len, "%sfaulty",sep); |
1608 | sep = ","; | |
1609 | } | |
b2d444d7 | 1610 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1611 | len += sprintf(page+len, "%sin_sync",sep); |
1612 | sep = ","; | |
1613 | } | |
b2d444d7 N |
1614 | if (!test_bit(Faulty, &rdev->flags) && |
1615 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1616 | len += sprintf(page+len, "%sspare", sep); |
1617 | sep = ","; | |
1618 | } | |
1619 | return len+sprintf(page+len, "\n"); | |
1620 | } | |
1621 | ||
96de1e66 N |
1622 | static struct rdev_sysfs_entry |
1623 | rdev_state = __ATTR_RO(state); | |
86e6ffdd N |
1624 | |
1625 | static ssize_t | |
96de1e66 | 1626 | super_show(mdk_rdev_t *rdev, char *page) |
86e6ffdd N |
1627 | { |
1628 | if (rdev->sb_loaded && rdev->sb_size) { | |
1629 | memcpy(page, page_address(rdev->sb_page), rdev->sb_size); | |
1630 | return rdev->sb_size; | |
1631 | } else | |
1632 | return 0; | |
1633 | } | |
96de1e66 N |
1634 | static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super); |
1635 | ||
4dbcdc75 N |
1636 | static ssize_t |
1637 | errors_show(mdk_rdev_t *rdev, char *page) | |
1638 | { | |
1639 | return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors)); | |
1640 | } | |
1641 | ||
1642 | static ssize_t | |
1643 | errors_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1644 | { | |
1645 | char *e; | |
1646 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1647 | if (*buf && (*e == 0 || *e == '\n')) { | |
1648 | atomic_set(&rdev->corrected_errors, n); | |
1649 | return len; | |
1650 | } | |
1651 | return -EINVAL; | |
1652 | } | |
1653 | static struct rdev_sysfs_entry rdev_errors = | |
1654 | __ATTR(errors, 0644, errors_show, errors_store); | |
1655 | ||
014236d2 N |
1656 | static ssize_t |
1657 | slot_show(mdk_rdev_t *rdev, char *page) | |
1658 | { | |
1659 | if (rdev->raid_disk < 0) | |
1660 | return sprintf(page, "none\n"); | |
1661 | else | |
1662 | return sprintf(page, "%d\n", rdev->raid_disk); | |
1663 | } | |
1664 | ||
1665 | static ssize_t | |
1666 | slot_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1667 | { | |
1668 | char *e; | |
1669 | int slot = simple_strtoul(buf, &e, 10); | |
1670 | if (strncmp(buf, "none", 4)==0) | |
1671 | slot = -1; | |
1672 | else if (e==buf || (*e && *e!= '\n')) | |
1673 | return -EINVAL; | |
1674 | if (rdev->mddev->pers) | |
1675 | /* Cannot set slot in active array (yet) */ | |
1676 | return -EBUSY; | |
1677 | if (slot >= rdev->mddev->raid_disks) | |
1678 | return -ENOSPC; | |
1679 | rdev->raid_disk = slot; | |
1680 | /* assume it is working */ | |
1681 | rdev->flags = 0; | |
1682 | set_bit(In_sync, &rdev->flags); | |
1683 | return len; | |
1684 | } | |
1685 | ||
1686 | ||
1687 | static struct rdev_sysfs_entry rdev_slot = | |
1688 | __ATTR(slot, 0644, slot_show, slot_store); | |
1689 | ||
93c8cad0 N |
1690 | static ssize_t |
1691 | offset_show(mdk_rdev_t *rdev, char *page) | |
1692 | { | |
6961ece4 | 1693 | return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset); |
93c8cad0 N |
1694 | } |
1695 | ||
1696 | static ssize_t | |
1697 | offset_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1698 | { | |
1699 | char *e; | |
1700 | unsigned long long offset = simple_strtoull(buf, &e, 10); | |
1701 | if (e==buf || (*e && *e != '\n')) | |
1702 | return -EINVAL; | |
1703 | if (rdev->mddev->pers) | |
1704 | return -EBUSY; | |
1705 | rdev->data_offset = offset; | |
1706 | return len; | |
1707 | } | |
1708 | ||
1709 | static struct rdev_sysfs_entry rdev_offset = | |
1710 | __ATTR(offset, 0644, offset_show, offset_store); | |
1711 | ||
83303b61 N |
1712 | static ssize_t |
1713 | rdev_size_show(mdk_rdev_t *rdev, char *page) | |
1714 | { | |
1715 | return sprintf(page, "%llu\n", (unsigned long long)rdev->size); | |
1716 | } | |
1717 | ||
1718 | static ssize_t | |
1719 | rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len) | |
1720 | { | |
1721 | char *e; | |
1722 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
1723 | if (e==buf || (*e && *e != '\n')) | |
1724 | return -EINVAL; | |
1725 | if (rdev->mddev->pers) | |
1726 | return -EBUSY; | |
1727 | rdev->size = size; | |
1728 | if (size < rdev->mddev->size || rdev->mddev->size == 0) | |
1729 | rdev->mddev->size = size; | |
1730 | return len; | |
1731 | } | |
1732 | ||
1733 | static struct rdev_sysfs_entry rdev_size = | |
1734 | __ATTR(size, 0644, rdev_size_show, rdev_size_store); | |
1735 | ||
86e6ffdd N |
1736 | static struct attribute *rdev_default_attrs[] = { |
1737 | &rdev_state.attr, | |
1738 | &rdev_super.attr, | |
4dbcdc75 | 1739 | &rdev_errors.attr, |
014236d2 | 1740 | &rdev_slot.attr, |
93c8cad0 | 1741 | &rdev_offset.attr, |
83303b61 | 1742 | &rdev_size.attr, |
86e6ffdd N |
1743 | NULL, |
1744 | }; | |
1745 | static ssize_t | |
1746 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1747 | { | |
1748 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1749 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1750 | ||
1751 | if (!entry->show) | |
1752 | return -EIO; | |
1753 | return entry->show(rdev, page); | |
1754 | } | |
1755 | ||
1756 | static ssize_t | |
1757 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
1758 | const char *page, size_t length) | |
1759 | { | |
1760 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1761 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1762 | ||
1763 | if (!entry->store) | |
1764 | return -EIO; | |
1765 | return entry->store(rdev, page, length); | |
1766 | } | |
1767 | ||
1768 | static void rdev_free(struct kobject *ko) | |
1769 | { | |
1770 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
1771 | kfree(rdev); | |
1772 | } | |
1773 | static struct sysfs_ops rdev_sysfs_ops = { | |
1774 | .show = rdev_attr_show, | |
1775 | .store = rdev_attr_store, | |
1776 | }; | |
1777 | static struct kobj_type rdev_ktype = { | |
1778 | .release = rdev_free, | |
1779 | .sysfs_ops = &rdev_sysfs_ops, | |
1780 | .default_attrs = rdev_default_attrs, | |
1781 | }; | |
1782 | ||
1da177e4 LT |
1783 | /* |
1784 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
1785 | * | |
1786 | * mark the device faulty if: | |
1787 | * | |
1788 | * - the device is nonexistent (zero size) | |
1789 | * - the device has no valid superblock | |
1790 | * | |
1791 | * a faulty rdev _never_ has rdev->sb set. | |
1792 | */ | |
1793 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
1794 | { | |
1795 | char b[BDEVNAME_SIZE]; | |
1796 | int err; | |
1797 | mdk_rdev_t *rdev; | |
1798 | sector_t size; | |
1799 | ||
9ffae0cf | 1800 | rdev = kzalloc(sizeof(*rdev), GFP_KERNEL); |
1da177e4 LT |
1801 | if (!rdev) { |
1802 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
1803 | return ERR_PTR(-ENOMEM); | |
1804 | } | |
1da177e4 LT |
1805 | |
1806 | if ((err = alloc_disk_sb(rdev))) | |
1807 | goto abort_free; | |
1808 | ||
1809 | err = lock_rdev(rdev, newdev); | |
1810 | if (err) | |
1811 | goto abort_free; | |
1812 | ||
86e6ffdd N |
1813 | rdev->kobj.parent = NULL; |
1814 | rdev->kobj.ktype = &rdev_ktype; | |
1815 | kobject_init(&rdev->kobj); | |
1816 | ||
1da177e4 | 1817 | rdev->desc_nr = -1; |
b2d444d7 | 1818 | rdev->flags = 0; |
1da177e4 LT |
1819 | rdev->data_offset = 0; |
1820 | atomic_set(&rdev->nr_pending, 0); | |
ba22dcbf | 1821 | atomic_set(&rdev->read_errors, 0); |
4dbcdc75 | 1822 | atomic_set(&rdev->corrected_errors, 0); |
1da177e4 LT |
1823 | |
1824 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
1825 | if (!size) { | |
1826 | printk(KERN_WARNING | |
1827 | "md: %s has zero or unknown size, marking faulty!\n", | |
1828 | bdevname(rdev->bdev,b)); | |
1829 | err = -EINVAL; | |
1830 | goto abort_free; | |
1831 | } | |
1832 | ||
1833 | if (super_format >= 0) { | |
1834 | err = super_types[super_format]. | |
1835 | load_super(rdev, NULL, super_minor); | |
1836 | if (err == -EINVAL) { | |
1837 | printk(KERN_WARNING | |
1838 | "md: %s has invalid sb, not importing!\n", | |
1839 | bdevname(rdev->bdev,b)); | |
1840 | goto abort_free; | |
1841 | } | |
1842 | if (err < 0) { | |
1843 | printk(KERN_WARNING | |
1844 | "md: could not read %s's sb, not importing!\n", | |
1845 | bdevname(rdev->bdev,b)); | |
1846 | goto abort_free; | |
1847 | } | |
1848 | } | |
1849 | INIT_LIST_HEAD(&rdev->same_set); | |
1850 | ||
1851 | return rdev; | |
1852 | ||
1853 | abort_free: | |
1854 | if (rdev->sb_page) { | |
1855 | if (rdev->bdev) | |
1856 | unlock_rdev(rdev); | |
1857 | free_disk_sb(rdev); | |
1858 | } | |
1859 | kfree(rdev); | |
1860 | return ERR_PTR(err); | |
1861 | } | |
1862 | ||
1863 | /* | |
1864 | * Check a full RAID array for plausibility | |
1865 | */ | |
1866 | ||
1867 | ||
a757e64c | 1868 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
1869 | { |
1870 | int i; | |
1871 | struct list_head *tmp; | |
1872 | mdk_rdev_t *rdev, *freshest; | |
1873 | char b[BDEVNAME_SIZE]; | |
1874 | ||
1875 | freshest = NULL; | |
1876 | ITERATE_RDEV(mddev,rdev,tmp) | |
1877 | switch (super_types[mddev->major_version]. | |
1878 | load_super(rdev, freshest, mddev->minor_version)) { | |
1879 | case 1: | |
1880 | freshest = rdev; | |
1881 | break; | |
1882 | case 0: | |
1883 | break; | |
1884 | default: | |
1885 | printk( KERN_ERR \ | |
1886 | "md: fatal superblock inconsistency in %s" | |
1887 | " -- removing from array\n", | |
1888 | bdevname(rdev->bdev,b)); | |
1889 | kick_rdev_from_array(rdev); | |
1890 | } | |
1891 | ||
1892 | ||
1893 | super_types[mddev->major_version]. | |
1894 | validate_super(mddev, freshest); | |
1895 | ||
1896 | i = 0; | |
1897 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1898 | if (rdev != freshest) | |
1899 | if (super_types[mddev->major_version]. | |
1900 | validate_super(mddev, rdev)) { | |
1901 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
1902 | " from array!\n", | |
1903 | bdevname(rdev->bdev,b)); | |
1904 | kick_rdev_from_array(rdev); | |
1905 | continue; | |
1906 | } | |
1907 | if (mddev->level == LEVEL_MULTIPATH) { | |
1908 | rdev->desc_nr = i++; | |
1909 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 1910 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1911 | } |
1912 | } | |
1913 | ||
1914 | ||
1915 | ||
1916 | if (mddev->recovery_cp != MaxSector && | |
1917 | mddev->level >= 1) | |
1918 | printk(KERN_ERR "md: %s: raid array is not clean" | |
1919 | " -- starting background reconstruction\n", | |
1920 | mdname(mddev)); | |
1921 | ||
1da177e4 LT |
1922 | } |
1923 | ||
eae1701f | 1924 | static ssize_t |
96de1e66 | 1925 | level_show(mddev_t *mddev, char *page) |
eae1701f | 1926 | { |
2604b703 | 1927 | struct mdk_personality *p = mddev->pers; |
d9d166c2 | 1928 | if (p) |
eae1701f | 1929 | return sprintf(page, "%s\n", p->name); |
d9d166c2 N |
1930 | else if (mddev->clevel[0]) |
1931 | return sprintf(page, "%s\n", mddev->clevel); | |
1932 | else if (mddev->level != LEVEL_NONE) | |
1933 | return sprintf(page, "%d\n", mddev->level); | |
1934 | else | |
1935 | return 0; | |
eae1701f N |
1936 | } |
1937 | ||
d9d166c2 N |
1938 | static ssize_t |
1939 | level_store(mddev_t *mddev, const char *buf, size_t len) | |
1940 | { | |
1941 | int rv = len; | |
1942 | if (mddev->pers) | |
1943 | return -EBUSY; | |
1944 | if (len == 0) | |
1945 | return 0; | |
1946 | if (len >= sizeof(mddev->clevel)) | |
1947 | return -ENOSPC; | |
1948 | strncpy(mddev->clevel, buf, len); | |
1949 | if (mddev->clevel[len-1] == '\n') | |
1950 | len--; | |
1951 | mddev->clevel[len] = 0; | |
1952 | mddev->level = LEVEL_NONE; | |
1953 | return rv; | |
1954 | } | |
1955 | ||
1956 | static struct md_sysfs_entry md_level = | |
1957 | __ATTR(level, 0644, level_show, level_store); | |
eae1701f N |
1958 | |
1959 | static ssize_t | |
96de1e66 | 1960 | raid_disks_show(mddev_t *mddev, char *page) |
eae1701f | 1961 | { |
bb636547 N |
1962 | if (mddev->raid_disks == 0) |
1963 | return 0; | |
eae1701f N |
1964 | return sprintf(page, "%d\n", mddev->raid_disks); |
1965 | } | |
1966 | ||
da943b99 N |
1967 | static int update_raid_disks(mddev_t *mddev, int raid_disks); |
1968 | ||
1969 | static ssize_t | |
1970 | raid_disks_store(mddev_t *mddev, const char *buf, size_t len) | |
1971 | { | |
1972 | /* can only set raid_disks if array is not yet active */ | |
1973 | char *e; | |
1974 | int rv = 0; | |
1975 | unsigned long n = simple_strtoul(buf, &e, 10); | |
1976 | ||
1977 | if (!*buf || (*e && *e != '\n')) | |
1978 | return -EINVAL; | |
1979 | ||
1980 | if (mddev->pers) | |
1981 | rv = update_raid_disks(mddev, n); | |
1982 | else | |
1983 | mddev->raid_disks = n; | |
1984 | return rv ? rv : len; | |
1985 | } | |
1986 | static struct md_sysfs_entry md_raid_disks = | |
1987 | __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store); | |
eae1701f | 1988 | |
3b34380a N |
1989 | static ssize_t |
1990 | chunk_size_show(mddev_t *mddev, char *page) | |
1991 | { | |
1992 | return sprintf(page, "%d\n", mddev->chunk_size); | |
1993 | } | |
1994 | ||
1995 | static ssize_t | |
1996 | chunk_size_store(mddev_t *mddev, const char *buf, size_t len) | |
1997 | { | |
1998 | /* can only set chunk_size if array is not yet active */ | |
1999 | char *e; | |
2000 | unsigned long n = simple_strtoul(buf, &e, 10); | |
2001 | ||
2002 | if (mddev->pers) | |
2003 | return -EBUSY; | |
2004 | if (!*buf || (*e && *e != '\n')) | |
2005 | return -EINVAL; | |
2006 | ||
2007 | mddev->chunk_size = n; | |
2008 | return len; | |
2009 | } | |
2010 | static struct md_sysfs_entry md_chunk_size = | |
2011 | __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store); | |
2012 | ||
6d7ff738 N |
2013 | static ssize_t |
2014 | null_show(mddev_t *mddev, char *page) | |
2015 | { | |
2016 | return -EINVAL; | |
2017 | } | |
2018 | ||
2019 | static ssize_t | |
2020 | new_dev_store(mddev_t *mddev, const char *buf, size_t len) | |
2021 | { | |
2022 | /* buf must be %d:%d\n? giving major and minor numbers */ | |
2023 | /* The new device is added to the array. | |
2024 | * If the array has a persistent superblock, we read the | |
2025 | * superblock to initialise info and check validity. | |
2026 | * Otherwise, only checking done is that in bind_rdev_to_array, | |
2027 | * which mainly checks size. | |
2028 | */ | |
2029 | char *e; | |
2030 | int major = simple_strtoul(buf, &e, 10); | |
2031 | int minor; | |
2032 | dev_t dev; | |
2033 | mdk_rdev_t *rdev; | |
2034 | int err; | |
2035 | ||
2036 | if (!*buf || *e != ':' || !e[1] || e[1] == '\n') | |
2037 | return -EINVAL; | |
2038 | minor = simple_strtoul(e+1, &e, 10); | |
2039 | if (*e && *e != '\n') | |
2040 | return -EINVAL; | |
2041 | dev = MKDEV(major, minor); | |
2042 | if (major != MAJOR(dev) || | |
2043 | minor != MINOR(dev)) | |
2044 | return -EOVERFLOW; | |
2045 | ||
2046 | ||
2047 | if (mddev->persistent) { | |
2048 | rdev = md_import_device(dev, mddev->major_version, | |
2049 | mddev->minor_version); | |
2050 | if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) { | |
2051 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2052 | mdk_rdev_t, same_set); | |
2053 | err = super_types[mddev->major_version] | |
2054 | .load_super(rdev, rdev0, mddev->minor_version); | |
2055 | if (err < 0) | |
2056 | goto out; | |
2057 | } | |
2058 | } else | |
2059 | rdev = md_import_device(dev, -1, -1); | |
2060 | ||
2061 | if (IS_ERR(rdev)) | |
2062 | return PTR_ERR(rdev); | |
2063 | err = bind_rdev_to_array(rdev, mddev); | |
2064 | out: | |
2065 | if (err) | |
2066 | export_rdev(rdev); | |
2067 | return err ? err : len; | |
2068 | } | |
2069 | ||
2070 | static struct md_sysfs_entry md_new_device = | |
2071 | __ATTR(new_dev, 0200, null_show, new_dev_store); | |
3b34380a | 2072 | |
a35b0d69 N |
2073 | static ssize_t |
2074 | size_show(mddev_t *mddev, char *page) | |
2075 | { | |
2076 | return sprintf(page, "%llu\n", (unsigned long long)mddev->size); | |
2077 | } | |
2078 | ||
2079 | static int update_size(mddev_t *mddev, unsigned long size); | |
2080 | ||
2081 | static ssize_t | |
2082 | size_store(mddev_t *mddev, const char *buf, size_t len) | |
2083 | { | |
2084 | /* If array is inactive, we can reduce the component size, but | |
2085 | * not increase it (except from 0). | |
2086 | * If array is active, we can try an on-line resize | |
2087 | */ | |
2088 | char *e; | |
2089 | int err = 0; | |
2090 | unsigned long long size = simple_strtoull(buf, &e, 10); | |
2091 | if (!*buf || *buf == '\n' || | |
2092 | (*e && *e != '\n')) | |
2093 | return -EINVAL; | |
2094 | ||
2095 | if (mddev->pers) { | |
2096 | err = update_size(mddev, size); | |
2097 | md_update_sb(mddev); | |
2098 | } else { | |
2099 | if (mddev->size == 0 || | |
2100 | mddev->size > size) | |
2101 | mddev->size = size; | |
2102 | else | |
2103 | err = -ENOSPC; | |
2104 | } | |
2105 | return err ? err : len; | |
2106 | } | |
2107 | ||
2108 | static struct md_sysfs_entry md_size = | |
2109 | __ATTR(component_size, 0644, size_show, size_store); | |
2110 | ||
8bb93aac N |
2111 | |
2112 | /* Metdata version. | |
2113 | * This is either 'none' for arrays with externally managed metadata, | |
2114 | * or N.M for internally known formats | |
2115 | */ | |
2116 | static ssize_t | |
2117 | metadata_show(mddev_t *mddev, char *page) | |
2118 | { | |
2119 | if (mddev->persistent) | |
2120 | return sprintf(page, "%d.%d\n", | |
2121 | mddev->major_version, mddev->minor_version); | |
2122 | else | |
2123 | return sprintf(page, "none\n"); | |
2124 | } | |
2125 | ||
2126 | static ssize_t | |
2127 | metadata_store(mddev_t *mddev, const char *buf, size_t len) | |
2128 | { | |
2129 | int major, minor; | |
2130 | char *e; | |
2131 | if (!list_empty(&mddev->disks)) | |
2132 | return -EBUSY; | |
2133 | ||
2134 | if (cmd_match(buf, "none")) { | |
2135 | mddev->persistent = 0; | |
2136 | mddev->major_version = 0; | |
2137 | mddev->minor_version = 90; | |
2138 | return len; | |
2139 | } | |
2140 | major = simple_strtoul(buf, &e, 10); | |
2141 | if (e==buf || *e != '.') | |
2142 | return -EINVAL; | |
2143 | buf = e+1; | |
2144 | minor = simple_strtoul(buf, &e, 10); | |
2145 | if (e==buf || *e != '\n') | |
2146 | return -EINVAL; | |
2147 | if (major >= sizeof(super_types)/sizeof(super_types[0]) || | |
2148 | super_types[major].name == NULL) | |
2149 | return -ENOENT; | |
2150 | mddev->major_version = major; | |
2151 | mddev->minor_version = minor; | |
2152 | mddev->persistent = 1; | |
2153 | return len; | |
2154 | } | |
2155 | ||
2156 | static struct md_sysfs_entry md_metadata = | |
2157 | __ATTR(metadata_version, 0644, metadata_show, metadata_store); | |
2158 | ||
24dd469d | 2159 | static ssize_t |
7eec314d | 2160 | action_show(mddev_t *mddev, char *page) |
24dd469d | 2161 | { |
7eec314d | 2162 | char *type = "idle"; |
31399d9e N |
2163 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2164 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { | |
2165 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
2166 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
2167 | type = "resync"; | |
2168 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
2169 | type = "check"; | |
2170 | else | |
2171 | type = "repair"; | |
2172 | } else | |
2173 | type = "recover"; | |
2174 | } | |
2175 | return sprintf(page, "%s\n", type); | |
2176 | } | |
2177 | ||
2178 | static ssize_t | |
7eec314d | 2179 | action_store(mddev_t *mddev, const char *page, size_t len) |
24dd469d | 2180 | { |
7eec314d N |
2181 | if (!mddev->pers || !mddev->pers->sync_request) |
2182 | return -EINVAL; | |
2183 | ||
bce74dac | 2184 | if (cmd_match(page, "idle")) { |
7eec314d N |
2185 | if (mddev->sync_thread) { |
2186 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2187 | md_unregister_thread(mddev->sync_thread); | |
2188 | mddev->sync_thread = NULL; | |
2189 | mddev->recovery = 0; | |
2190 | } | |
03c902e1 N |
2191 | } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
2192 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d | 2193 | return -EBUSY; |
03c902e1 | 2194 | else if (cmd_match(page, "resync") || cmd_match(page, "recover")) |
7eec314d N |
2195 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
2196 | else { | |
bce74dac | 2197 | if (cmd_match(page, "check")) |
7eec314d | 2198 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); |
bce74dac | 2199 | else if (cmd_match(page, "repair")) |
7eec314d N |
2200 | return -EINVAL; |
2201 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
2202 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
7eec314d | 2203 | } |
03c902e1 | 2204 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); |
24dd469d N |
2205 | md_wakeup_thread(mddev->thread); |
2206 | return len; | |
2207 | } | |
2208 | ||
9d88883e | 2209 | static ssize_t |
96de1e66 | 2210 | mismatch_cnt_show(mddev_t *mddev, char *page) |
9d88883e N |
2211 | { |
2212 | return sprintf(page, "%llu\n", | |
2213 | (unsigned long long) mddev->resync_mismatches); | |
2214 | } | |
2215 | ||
96de1e66 | 2216 | static struct md_sysfs_entry |
7eec314d | 2217 | md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store); |
24dd469d | 2218 | |
96de1e66 N |
2219 | |
2220 | static struct md_sysfs_entry | |
2221 | md_mismatches = __ATTR_RO(mismatch_cnt); | |
9d88883e | 2222 | |
88202a0c N |
2223 | static ssize_t |
2224 | sync_min_show(mddev_t *mddev, char *page) | |
2225 | { | |
2226 | return sprintf(page, "%d (%s)\n", speed_min(mddev), | |
2227 | mddev->sync_speed_min ? "local": "system"); | |
2228 | } | |
2229 | ||
2230 | static ssize_t | |
2231 | sync_min_store(mddev_t *mddev, const char *buf, size_t len) | |
2232 | { | |
2233 | int min; | |
2234 | char *e; | |
2235 | if (strncmp(buf, "system", 6)==0) { | |
2236 | mddev->sync_speed_min = 0; | |
2237 | return len; | |
2238 | } | |
2239 | min = simple_strtoul(buf, &e, 10); | |
2240 | if (buf == e || (*e && *e != '\n') || min <= 0) | |
2241 | return -EINVAL; | |
2242 | mddev->sync_speed_min = min; | |
2243 | return len; | |
2244 | } | |
2245 | ||
2246 | static struct md_sysfs_entry md_sync_min = | |
2247 | __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store); | |
2248 | ||
2249 | static ssize_t | |
2250 | sync_max_show(mddev_t *mddev, char *page) | |
2251 | { | |
2252 | return sprintf(page, "%d (%s)\n", speed_max(mddev), | |
2253 | mddev->sync_speed_max ? "local": "system"); | |
2254 | } | |
2255 | ||
2256 | static ssize_t | |
2257 | sync_max_store(mddev_t *mddev, const char *buf, size_t len) | |
2258 | { | |
2259 | int max; | |
2260 | char *e; | |
2261 | if (strncmp(buf, "system", 6)==0) { | |
2262 | mddev->sync_speed_max = 0; | |
2263 | return len; | |
2264 | } | |
2265 | max = simple_strtoul(buf, &e, 10); | |
2266 | if (buf == e || (*e && *e != '\n') || max <= 0) | |
2267 | return -EINVAL; | |
2268 | mddev->sync_speed_max = max; | |
2269 | return len; | |
2270 | } | |
2271 | ||
2272 | static struct md_sysfs_entry md_sync_max = | |
2273 | __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store); | |
2274 | ||
2275 | ||
2276 | static ssize_t | |
2277 | sync_speed_show(mddev_t *mddev, char *page) | |
2278 | { | |
2279 | unsigned long resync, dt, db; | |
2280 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
2281 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
2282 | if (!dt) dt++; | |
2283 | db = resync - (mddev->resync_mark_cnt); | |
2284 | return sprintf(page, "%ld\n", db/dt/2); /* K/sec */ | |
2285 | } | |
2286 | ||
2287 | static struct md_sysfs_entry | |
2288 | md_sync_speed = __ATTR_RO(sync_speed); | |
2289 | ||
2290 | static ssize_t | |
2291 | sync_completed_show(mddev_t *mddev, char *page) | |
2292 | { | |
2293 | unsigned long max_blocks, resync; | |
2294 | ||
2295 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
2296 | max_blocks = mddev->resync_max_sectors; | |
2297 | else | |
2298 | max_blocks = mddev->size << 1; | |
2299 | ||
2300 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active)); | |
2301 | return sprintf(page, "%lu / %lu\n", resync, max_blocks); | |
2302 | } | |
2303 | ||
2304 | static struct md_sysfs_entry | |
2305 | md_sync_completed = __ATTR_RO(sync_completed); | |
2306 | ||
eae1701f N |
2307 | static struct attribute *md_default_attrs[] = { |
2308 | &md_level.attr, | |
2309 | &md_raid_disks.attr, | |
3b34380a | 2310 | &md_chunk_size.attr, |
a35b0d69 | 2311 | &md_size.attr, |
8bb93aac | 2312 | &md_metadata.attr, |
6d7ff738 | 2313 | &md_new_device.attr, |
411036fa N |
2314 | NULL, |
2315 | }; | |
2316 | ||
2317 | static struct attribute *md_redundancy_attrs[] = { | |
24dd469d | 2318 | &md_scan_mode.attr, |
9d88883e | 2319 | &md_mismatches.attr, |
88202a0c N |
2320 | &md_sync_min.attr, |
2321 | &md_sync_max.attr, | |
2322 | &md_sync_speed.attr, | |
2323 | &md_sync_completed.attr, | |
eae1701f N |
2324 | NULL, |
2325 | }; | |
411036fa N |
2326 | static struct attribute_group md_redundancy_group = { |
2327 | .name = NULL, | |
2328 | .attrs = md_redundancy_attrs, | |
2329 | }; | |
2330 | ||
eae1701f N |
2331 | |
2332 | static ssize_t | |
2333 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
2334 | { | |
2335 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
2336 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 2337 | ssize_t rv; |
eae1701f N |
2338 | |
2339 | if (!entry->show) | |
2340 | return -EIO; | |
96de1e66 N |
2341 | mddev_lock(mddev); |
2342 | rv = entry->show(mddev, page); | |
2343 | mddev_unlock(mddev); | |
2344 | return rv; | |
eae1701f N |
2345 | } |
2346 | ||
2347 | static ssize_t | |
2348 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
2349 | const char *page, size_t length) | |
2350 | { | |
2351 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
2352 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
96de1e66 | 2353 | ssize_t rv; |
eae1701f N |
2354 | |
2355 | if (!entry->store) | |
2356 | return -EIO; | |
96de1e66 N |
2357 | mddev_lock(mddev); |
2358 | rv = entry->store(mddev, page, length); | |
2359 | mddev_unlock(mddev); | |
2360 | return rv; | |
eae1701f N |
2361 | } |
2362 | ||
2363 | static void md_free(struct kobject *ko) | |
2364 | { | |
2365 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
2366 | kfree(mddev); | |
2367 | } | |
2368 | ||
2369 | static struct sysfs_ops md_sysfs_ops = { | |
2370 | .show = md_attr_show, | |
2371 | .store = md_attr_store, | |
2372 | }; | |
2373 | static struct kobj_type md_ktype = { | |
2374 | .release = md_free, | |
2375 | .sysfs_ops = &md_sysfs_ops, | |
2376 | .default_attrs = md_default_attrs, | |
2377 | }; | |
2378 | ||
1da177e4 LT |
2379 | int mdp_major = 0; |
2380 | ||
2381 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
2382 | { | |
2383 | static DECLARE_MUTEX(disks_sem); | |
2384 | mddev_t *mddev = mddev_find(dev); | |
2385 | struct gendisk *disk; | |
2386 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
2387 | int shift = partitioned ? MdpMinorShift : 0; | |
2388 | int unit = MINOR(dev) >> shift; | |
2389 | ||
2390 | if (!mddev) | |
2391 | return NULL; | |
2392 | ||
2393 | down(&disks_sem); | |
2394 | if (mddev->gendisk) { | |
2395 | up(&disks_sem); | |
2396 | mddev_put(mddev); | |
2397 | return NULL; | |
2398 | } | |
2399 | disk = alloc_disk(1 << shift); | |
2400 | if (!disk) { | |
2401 | up(&disks_sem); | |
2402 | mddev_put(mddev); | |
2403 | return NULL; | |
2404 | } | |
2405 | disk->major = MAJOR(dev); | |
2406 | disk->first_minor = unit << shift; | |
2407 | if (partitioned) { | |
2408 | sprintf(disk->disk_name, "md_d%d", unit); | |
2409 | sprintf(disk->devfs_name, "md/d%d", unit); | |
2410 | } else { | |
2411 | sprintf(disk->disk_name, "md%d", unit); | |
2412 | sprintf(disk->devfs_name, "md/%d", unit); | |
2413 | } | |
2414 | disk->fops = &md_fops; | |
2415 | disk->private_data = mddev; | |
2416 | disk->queue = mddev->queue; | |
2417 | add_disk(disk); | |
2418 | mddev->gendisk = disk; | |
2419 | up(&disks_sem); | |
9c791977 | 2420 | mddev->kobj.parent = &disk->kobj; |
eae1701f N |
2421 | mddev->kobj.k_name = NULL; |
2422 | snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); | |
2423 | mddev->kobj.ktype = &md_ktype; | |
2424 | kobject_register(&mddev->kobj); | |
1da177e4 LT |
2425 | return NULL; |
2426 | } | |
2427 | ||
2428 | void md_wakeup_thread(mdk_thread_t *thread); | |
2429 | ||
2430 | static void md_safemode_timeout(unsigned long data) | |
2431 | { | |
2432 | mddev_t *mddev = (mddev_t *) data; | |
2433 | ||
2434 | mddev->safemode = 1; | |
2435 | md_wakeup_thread(mddev->thread); | |
2436 | } | |
2437 | ||
6ff8d8ec | 2438 | static int start_dirty_degraded; |
1da177e4 LT |
2439 | |
2440 | static int do_md_run(mddev_t * mddev) | |
2441 | { | |
2604b703 | 2442 | int err; |
1da177e4 LT |
2443 | int chunk_size; |
2444 | struct list_head *tmp; | |
2445 | mdk_rdev_t *rdev; | |
2446 | struct gendisk *disk; | |
2604b703 | 2447 | struct mdk_personality *pers; |
1da177e4 LT |
2448 | char b[BDEVNAME_SIZE]; |
2449 | ||
a757e64c N |
2450 | if (list_empty(&mddev->disks)) |
2451 | /* cannot run an array with no devices.. */ | |
1da177e4 | 2452 | return -EINVAL; |
1da177e4 LT |
2453 | |
2454 | if (mddev->pers) | |
2455 | return -EBUSY; | |
2456 | ||
2457 | /* | |
2458 | * Analyze all RAID superblock(s) | |
2459 | */ | |
a757e64c N |
2460 | if (!mddev->raid_disks) |
2461 | analyze_sbs(mddev); | |
1da177e4 LT |
2462 | |
2463 | chunk_size = mddev->chunk_size; | |
2604b703 N |
2464 | |
2465 | if (chunk_size) { | |
1da177e4 LT |
2466 | if (chunk_size > MAX_CHUNK_SIZE) { |
2467 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
2468 | chunk_size, MAX_CHUNK_SIZE); | |
2469 | return -EINVAL; | |
2470 | } | |
2471 | /* | |
2472 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
2473 | */ | |
2474 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 2475 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
2476 | return -EINVAL; |
2477 | } | |
2478 | if (chunk_size < PAGE_SIZE) { | |
2479 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
2480 | chunk_size, PAGE_SIZE); | |
2481 | return -EINVAL; | |
2482 | } | |
2483 | ||
2484 | /* devices must have minimum size of one chunk */ | |
2485 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2486 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2487 | continue; |
2488 | if (rdev->size < chunk_size / 1024) { | |
2489 | printk(KERN_WARNING | |
2490 | "md: Dev %s smaller than chunk_size:" | |
2491 | " %lluk < %dk\n", | |
2492 | bdevname(rdev->bdev,b), | |
2493 | (unsigned long long)rdev->size, | |
2494 | chunk_size / 1024); | |
2495 | return -EINVAL; | |
2496 | } | |
2497 | } | |
2498 | } | |
2499 | ||
1da177e4 | 2500 | #ifdef CONFIG_KMOD |
d9d166c2 N |
2501 | if (mddev->level != LEVEL_NONE) |
2502 | request_module("md-level-%d", mddev->level); | |
2503 | else if (mddev->clevel[0]) | |
2504 | request_module("md-%s", mddev->clevel); | |
1da177e4 LT |
2505 | #endif |
2506 | ||
2507 | /* | |
2508 | * Drop all container device buffers, from now on | |
2509 | * the only valid external interface is through the md | |
2510 | * device. | |
2511 | * Also find largest hardsector size | |
2512 | */ | |
2513 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 2514 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2515 | continue; |
2516 | sync_blockdev(rdev->bdev); | |
2517 | invalidate_bdev(rdev->bdev, 0); | |
2518 | } | |
2519 | ||
2520 | md_probe(mddev->unit, NULL, NULL); | |
2521 | disk = mddev->gendisk; | |
2522 | if (!disk) | |
2523 | return -ENOMEM; | |
2524 | ||
2525 | spin_lock(&pers_lock); | |
d9d166c2 | 2526 | pers = find_pers(mddev->level, mddev->clevel); |
2604b703 | 2527 | if (!pers || !try_module_get(pers->owner)) { |
1da177e4 | 2528 | spin_unlock(&pers_lock); |
d9d166c2 N |
2529 | if (mddev->level != LEVEL_NONE) |
2530 | printk(KERN_WARNING "md: personality for level %d is not loaded!\n", | |
2531 | mddev->level); | |
2532 | else | |
2533 | printk(KERN_WARNING "md: personality for level %s is not loaded!\n", | |
2534 | mddev->clevel); | |
1da177e4 LT |
2535 | return -EINVAL; |
2536 | } | |
2604b703 | 2537 | mddev->pers = pers; |
1da177e4 | 2538 | spin_unlock(&pers_lock); |
d9d166c2 N |
2539 | mddev->level = pers->level; |
2540 | strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel)); | |
1da177e4 | 2541 | |
657390d2 | 2542 | mddev->recovery = 0; |
1da177e4 | 2543 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
a9701a30 | 2544 | mddev->barriers_work = 1; |
6ff8d8ec | 2545 | mddev->ok_start_degraded = start_dirty_degraded; |
1da177e4 | 2546 | |
f91de92e N |
2547 | if (start_readonly) |
2548 | mddev->ro = 2; /* read-only, but switch on first write */ | |
2549 | ||
b15c2e57 N |
2550 | err = mddev->pers->run(mddev); |
2551 | if (!err && mddev->pers->sync_request) { | |
2552 | err = bitmap_create(mddev); | |
2553 | if (err) { | |
2554 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
2555 | mdname(mddev), err); | |
2556 | mddev->pers->stop(mddev); | |
2557 | } | |
2558 | } | |
1da177e4 LT |
2559 | if (err) { |
2560 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
2561 | module_put(mddev->pers->owner); | |
2562 | mddev->pers = NULL; | |
32a7627c N |
2563 | bitmap_destroy(mddev); |
2564 | return err; | |
1da177e4 | 2565 | } |
411036fa N |
2566 | if (mddev->pers->sync_request) |
2567 | sysfs_create_group(&mddev->kobj, &md_redundancy_group); | |
fd9d49ca N |
2568 | else if (mddev->ro == 2) /* auto-readonly not meaningful */ |
2569 | mddev->ro = 0; | |
2570 | ||
1da177e4 LT |
2571 | atomic_set(&mddev->writes_pending,0); |
2572 | mddev->safemode = 0; | |
2573 | mddev->safemode_timer.function = md_safemode_timeout; | |
2574 | mddev->safemode_timer.data = (unsigned long) mddev; | |
2575 | mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ | |
2576 | mddev->in_sync = 1; | |
86e6ffdd N |
2577 | |
2578 | ITERATE_RDEV(mddev,rdev,tmp) | |
2579 | if (rdev->raid_disk >= 0) { | |
2580 | char nm[20]; | |
2581 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2582 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
2583 | } | |
1da177e4 LT |
2584 | |
2585 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2586 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2587 | |
2588 | if (mddev->sb_dirty) | |
2589 | md_update_sb(mddev); | |
2590 | ||
2591 | set_capacity(disk, mddev->array_size<<1); | |
2592 | ||
2593 | /* If we call blk_queue_make_request here, it will | |
2594 | * re-initialise max_sectors etc which may have been | |
2595 | * refined inside -> run. So just set the bits we need to set. | |
2596 | * Most initialisation happended when we called | |
2597 | * blk_queue_make_request(..., md_fail_request) | |
2598 | * earlier. | |
2599 | */ | |
2600 | mddev->queue->queuedata = mddev; | |
2601 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
2602 | ||
2603 | mddev->changed = 1; | |
d7603b7e | 2604 | md_new_event(mddev); |
1da177e4 LT |
2605 | return 0; |
2606 | } | |
2607 | ||
2608 | static int restart_array(mddev_t *mddev) | |
2609 | { | |
2610 | struct gendisk *disk = mddev->gendisk; | |
2611 | int err; | |
2612 | ||
2613 | /* | |
2614 | * Complain if it has no devices | |
2615 | */ | |
2616 | err = -ENXIO; | |
2617 | if (list_empty(&mddev->disks)) | |
2618 | goto out; | |
2619 | ||
2620 | if (mddev->pers) { | |
2621 | err = -EBUSY; | |
2622 | if (!mddev->ro) | |
2623 | goto out; | |
2624 | ||
2625 | mddev->safemode = 0; | |
2626 | mddev->ro = 0; | |
2627 | set_disk_ro(disk, 0); | |
2628 | ||
2629 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
2630 | mdname(mddev)); | |
2631 | /* | |
2632 | * Kick recovery or resync if necessary | |
2633 | */ | |
2634 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2635 | md_wakeup_thread(mddev->thread); | |
2636 | err = 0; | |
2637 | } else { | |
2638 | printk(KERN_ERR "md: %s has no personality assigned.\n", | |
2639 | mdname(mddev)); | |
2640 | err = -EINVAL; | |
2641 | } | |
2642 | ||
2643 | out: | |
2644 | return err; | |
2645 | } | |
2646 | ||
2647 | static int do_md_stop(mddev_t * mddev, int ro) | |
2648 | { | |
2649 | int err = 0; | |
2650 | struct gendisk *disk = mddev->gendisk; | |
2651 | ||
2652 | if (mddev->pers) { | |
2653 | if (atomic_read(&mddev->active)>2) { | |
2654 | printk("md: %s still in use.\n",mdname(mddev)); | |
2655 | return -EBUSY; | |
2656 | } | |
2657 | ||
2658 | if (mddev->sync_thread) { | |
2659 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2660 | md_unregister_thread(mddev->sync_thread); | |
2661 | mddev->sync_thread = NULL; | |
2662 | } | |
2663 | ||
2664 | del_timer_sync(&mddev->safemode_timer); | |
2665 | ||
2666 | invalidate_partition(disk, 0); | |
2667 | ||
2668 | if (ro) { | |
2669 | err = -ENXIO; | |
f91de92e | 2670 | if (mddev->ro==1) |
1da177e4 LT |
2671 | goto out; |
2672 | mddev->ro = 1; | |
2673 | } else { | |
6b8b3e8a | 2674 | bitmap_flush(mddev); |
a9701a30 | 2675 | md_super_wait(mddev); |
1da177e4 LT |
2676 | if (mddev->ro) |
2677 | set_disk_ro(disk, 0); | |
2678 | blk_queue_make_request(mddev->queue, md_fail_request); | |
2679 | mddev->pers->stop(mddev); | |
411036fa N |
2680 | if (mddev->pers->sync_request) |
2681 | sysfs_remove_group(&mddev->kobj, &md_redundancy_group); | |
2682 | ||
1da177e4 LT |
2683 | module_put(mddev->pers->owner); |
2684 | mddev->pers = NULL; | |
2685 | if (mddev->ro) | |
2686 | mddev->ro = 0; | |
2687 | } | |
2688 | if (!mddev->in_sync) { | |
2689 | /* mark array as shutdown cleanly */ | |
2690 | mddev->in_sync = 1; | |
2691 | md_update_sb(mddev); | |
2692 | } | |
2693 | if (ro) | |
2694 | set_disk_ro(disk, 1); | |
2695 | } | |
32a7627c | 2696 | |
1da177e4 LT |
2697 | /* |
2698 | * Free resources if final stop | |
2699 | */ | |
2700 | if (!ro) { | |
86e6ffdd N |
2701 | mdk_rdev_t *rdev; |
2702 | struct list_head *tmp; | |
1da177e4 LT |
2703 | struct gendisk *disk; |
2704 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); | |
2705 | ||
978f946b N |
2706 | bitmap_destroy(mddev); |
2707 | if (mddev->bitmap_file) { | |
2708 | atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1); | |
2709 | fput(mddev->bitmap_file); | |
2710 | mddev->bitmap_file = NULL; | |
2711 | } | |
2712 | mddev->bitmap_offset = 0; | |
2713 | ||
86e6ffdd N |
2714 | ITERATE_RDEV(mddev,rdev,tmp) |
2715 | if (rdev->raid_disk >= 0) { | |
2716 | char nm[20]; | |
2717 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2718 | sysfs_remove_link(&mddev->kobj, nm); | |
2719 | } | |
2720 | ||
1da177e4 LT |
2721 | export_array(mddev); |
2722 | ||
2723 | mddev->array_size = 0; | |
2724 | disk = mddev->gendisk; | |
2725 | if (disk) | |
2726 | set_capacity(disk, 0); | |
2727 | mddev->changed = 1; | |
2728 | } else | |
2729 | printk(KERN_INFO "md: %s switched to read-only mode.\n", | |
2730 | mdname(mddev)); | |
2731 | err = 0; | |
d7603b7e | 2732 | md_new_event(mddev); |
1da177e4 LT |
2733 | out: |
2734 | return err; | |
2735 | } | |
2736 | ||
2737 | static void autorun_array(mddev_t *mddev) | |
2738 | { | |
2739 | mdk_rdev_t *rdev; | |
2740 | struct list_head *tmp; | |
2741 | int err; | |
2742 | ||
a757e64c | 2743 | if (list_empty(&mddev->disks)) |
1da177e4 | 2744 | return; |
1da177e4 LT |
2745 | |
2746 | printk(KERN_INFO "md: running: "); | |
2747 | ||
2748 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2749 | char b[BDEVNAME_SIZE]; | |
2750 | printk("<%s>", bdevname(rdev->bdev,b)); | |
2751 | } | |
2752 | printk("\n"); | |
2753 | ||
2754 | err = do_md_run (mddev); | |
2755 | if (err) { | |
2756 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
2757 | do_md_stop (mddev, 0); | |
2758 | } | |
2759 | } | |
2760 | ||
2761 | /* | |
2762 | * lets try to run arrays based on all disks that have arrived | |
2763 | * until now. (those are in pending_raid_disks) | |
2764 | * | |
2765 | * the method: pick the first pending disk, collect all disks with | |
2766 | * the same UUID, remove all from the pending list and put them into | |
2767 | * the 'same_array' list. Then order this list based on superblock | |
2768 | * update time (freshest comes first), kick out 'old' disks and | |
2769 | * compare superblocks. If everything's fine then run it. | |
2770 | * | |
2771 | * If "unit" is allocated, then bump its reference count | |
2772 | */ | |
2773 | static void autorun_devices(int part) | |
2774 | { | |
2775 | struct list_head candidates; | |
2776 | struct list_head *tmp; | |
2777 | mdk_rdev_t *rdev0, *rdev; | |
2778 | mddev_t *mddev; | |
2779 | char b[BDEVNAME_SIZE]; | |
2780 | ||
2781 | printk(KERN_INFO "md: autorun ...\n"); | |
2782 | while (!list_empty(&pending_raid_disks)) { | |
2783 | dev_t dev; | |
2784 | rdev0 = list_entry(pending_raid_disks.next, | |
2785 | mdk_rdev_t, same_set); | |
2786 | ||
2787 | printk(KERN_INFO "md: considering %s ...\n", | |
2788 | bdevname(rdev0->bdev,b)); | |
2789 | INIT_LIST_HEAD(&candidates); | |
2790 | ITERATE_RDEV_PENDING(rdev,tmp) | |
2791 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
2792 | printk(KERN_INFO "md: adding %s ...\n", | |
2793 | bdevname(rdev->bdev,b)); | |
2794 | list_move(&rdev->same_set, &candidates); | |
2795 | } | |
2796 | /* | |
2797 | * now we have a set of devices, with all of them having | |
2798 | * mostly sane superblocks. It's time to allocate the | |
2799 | * mddev. | |
2800 | */ | |
2801 | if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { | |
2802 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", | |
2803 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
2804 | break; | |
2805 | } | |
2806 | if (part) | |
2807 | dev = MKDEV(mdp_major, | |
2808 | rdev0->preferred_minor << MdpMinorShift); | |
2809 | else | |
2810 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
2811 | ||
2812 | md_probe(dev, NULL, NULL); | |
2813 | mddev = mddev_find(dev); | |
2814 | if (!mddev) { | |
2815 | printk(KERN_ERR | |
2816 | "md: cannot allocate memory for md drive.\n"); | |
2817 | break; | |
2818 | } | |
2819 | if (mddev_lock(mddev)) | |
2820 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
2821 | mdname(mddev)); | |
2822 | else if (mddev->raid_disks || mddev->major_version | |
2823 | || !list_empty(&mddev->disks)) { | |
2824 | printk(KERN_WARNING | |
2825 | "md: %s already running, cannot run %s\n", | |
2826 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
2827 | mddev_unlock(mddev); | |
2828 | } else { | |
2829 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
2830 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { | |
2831 | list_del_init(&rdev->same_set); | |
2832 | if (bind_rdev_to_array(rdev, mddev)) | |
2833 | export_rdev(rdev); | |
2834 | } | |
2835 | autorun_array(mddev); | |
2836 | mddev_unlock(mddev); | |
2837 | } | |
2838 | /* on success, candidates will be empty, on error | |
2839 | * it won't... | |
2840 | */ | |
2841 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) | |
2842 | export_rdev(rdev); | |
2843 | mddev_put(mddev); | |
2844 | } | |
2845 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
2846 | } | |
2847 | ||
2848 | /* | |
2849 | * import RAID devices based on one partition | |
2850 | * if possible, the array gets run as well. | |
2851 | */ | |
2852 | ||
2853 | static int autostart_array(dev_t startdev) | |
2854 | { | |
2855 | char b[BDEVNAME_SIZE]; | |
2856 | int err = -EINVAL, i; | |
2857 | mdp_super_t *sb = NULL; | |
2858 | mdk_rdev_t *start_rdev = NULL, *rdev; | |
2859 | ||
2860 | start_rdev = md_import_device(startdev, 0, 0); | |
2861 | if (IS_ERR(start_rdev)) | |
2862 | return err; | |
2863 | ||
2864 | ||
2865 | /* NOTE: this can only work for 0.90.0 superblocks */ | |
2866 | sb = (mdp_super_t*)page_address(start_rdev->sb_page); | |
2867 | if (sb->major_version != 0 || | |
2868 | sb->minor_version != 90 ) { | |
2869 | printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); | |
2870 | export_rdev(start_rdev); | |
2871 | return err; | |
2872 | } | |
2873 | ||
b2d444d7 | 2874 | if (test_bit(Faulty, &start_rdev->flags)) { |
1da177e4 LT |
2875 | printk(KERN_WARNING |
2876 | "md: can not autostart based on faulty %s!\n", | |
2877 | bdevname(start_rdev->bdev,b)); | |
2878 | export_rdev(start_rdev); | |
2879 | return err; | |
2880 | } | |
2881 | list_add(&start_rdev->same_set, &pending_raid_disks); | |
2882 | ||
2883 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2884 | mdp_disk_t *desc = sb->disks + i; | |
2885 | dev_t dev = MKDEV(desc->major, desc->minor); | |
2886 | ||
2887 | if (!dev) | |
2888 | continue; | |
2889 | if (dev == startdev) | |
2890 | continue; | |
2891 | if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) | |
2892 | continue; | |
2893 | rdev = md_import_device(dev, 0, 0); | |
2894 | if (IS_ERR(rdev)) | |
2895 | continue; | |
2896 | ||
2897 | list_add(&rdev->same_set, &pending_raid_disks); | |
2898 | } | |
2899 | ||
2900 | /* | |
2901 | * possibly return codes | |
2902 | */ | |
2903 | autorun_devices(0); | |
2904 | return 0; | |
2905 | ||
2906 | } | |
2907 | ||
2908 | ||
2909 | static int get_version(void __user * arg) | |
2910 | { | |
2911 | mdu_version_t ver; | |
2912 | ||
2913 | ver.major = MD_MAJOR_VERSION; | |
2914 | ver.minor = MD_MINOR_VERSION; | |
2915 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
2916 | ||
2917 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
2918 | return -EFAULT; | |
2919 | ||
2920 | return 0; | |
2921 | } | |
2922 | ||
2923 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
2924 | { | |
2925 | mdu_array_info_t info; | |
2926 | int nr,working,active,failed,spare; | |
2927 | mdk_rdev_t *rdev; | |
2928 | struct list_head *tmp; | |
2929 | ||
2930 | nr=working=active=failed=spare=0; | |
2931 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2932 | nr++; | |
b2d444d7 | 2933 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2934 | failed++; |
2935 | else { | |
2936 | working++; | |
b2d444d7 | 2937 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
2938 | active++; |
2939 | else | |
2940 | spare++; | |
2941 | } | |
2942 | } | |
2943 | ||
2944 | info.major_version = mddev->major_version; | |
2945 | info.minor_version = mddev->minor_version; | |
2946 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
2947 | info.ctime = mddev->ctime; | |
2948 | info.level = mddev->level; | |
2949 | info.size = mddev->size; | |
284ae7ca N |
2950 | if (info.size != mddev->size) /* overflow */ |
2951 | info.size = -1; | |
1da177e4 LT |
2952 | info.nr_disks = nr; |
2953 | info.raid_disks = mddev->raid_disks; | |
2954 | info.md_minor = mddev->md_minor; | |
2955 | info.not_persistent= !mddev->persistent; | |
2956 | ||
2957 | info.utime = mddev->utime; | |
2958 | info.state = 0; | |
2959 | if (mddev->in_sync) | |
2960 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
2961 | if (mddev->bitmap && mddev->bitmap_offset) |
2962 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
2963 | info.active_disks = active; |
2964 | info.working_disks = working; | |
2965 | info.failed_disks = failed; | |
2966 | info.spare_disks = spare; | |
2967 | ||
2968 | info.layout = mddev->layout; | |
2969 | info.chunk_size = mddev->chunk_size; | |
2970 | ||
2971 | if (copy_to_user(arg, &info, sizeof(info))) | |
2972 | return -EFAULT; | |
2973 | ||
2974 | return 0; | |
2975 | } | |
2976 | ||
87162a28 | 2977 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
2978 | { |
2979 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
2980 | char *ptr, *buf = NULL; | |
2981 | int err = -ENOMEM; | |
2982 | ||
2983 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2984 | if (!file) | |
2985 | goto out; | |
2986 | ||
2987 | /* bitmap disabled, zero the first byte and copy out */ | |
2988 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
2989 | file->pathname[0] = '\0'; | |
2990 | goto copy_out; | |
2991 | } | |
2992 | ||
2993 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
2994 | if (!buf) | |
2995 | goto out; | |
2996 | ||
2997 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
2998 | if (!ptr) | |
2999 | goto out; | |
3000 | ||
3001 | strcpy(file->pathname, ptr); | |
3002 | ||
3003 | copy_out: | |
3004 | err = 0; | |
3005 | if (copy_to_user(arg, file, sizeof(*file))) | |
3006 | err = -EFAULT; | |
3007 | out: | |
3008 | kfree(buf); | |
3009 | kfree(file); | |
3010 | return err; | |
3011 | } | |
3012 | ||
1da177e4 LT |
3013 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
3014 | { | |
3015 | mdu_disk_info_t info; | |
3016 | unsigned int nr; | |
3017 | mdk_rdev_t *rdev; | |
3018 | ||
3019 | if (copy_from_user(&info, arg, sizeof(info))) | |
3020 | return -EFAULT; | |
3021 | ||
3022 | nr = info.number; | |
3023 | ||
3024 | rdev = find_rdev_nr(mddev, nr); | |
3025 | if (rdev) { | |
3026 | info.major = MAJOR(rdev->bdev->bd_dev); | |
3027 | info.minor = MINOR(rdev->bdev->bd_dev); | |
3028 | info.raid_disk = rdev->raid_disk; | |
3029 | info.state = 0; | |
b2d444d7 | 3030 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3031 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 3032 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
3033 | info.state |= (1<<MD_DISK_ACTIVE); |
3034 | info.state |= (1<<MD_DISK_SYNC); | |
3035 | } | |
8ddf9efe N |
3036 | if (test_bit(WriteMostly, &rdev->flags)) |
3037 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
3038 | } else { |
3039 | info.major = info.minor = 0; | |
3040 | info.raid_disk = -1; | |
3041 | info.state = (1<<MD_DISK_REMOVED); | |
3042 | } | |
3043 | ||
3044 | if (copy_to_user(arg, &info, sizeof(info))) | |
3045 | return -EFAULT; | |
3046 | ||
3047 | return 0; | |
3048 | } | |
3049 | ||
3050 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
3051 | { | |
3052 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
3053 | mdk_rdev_t *rdev; | |
3054 | dev_t dev = MKDEV(info->major,info->minor); | |
3055 | ||
3056 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
3057 | return -EOVERFLOW; | |
3058 | ||
3059 | if (!mddev->raid_disks) { | |
3060 | int err; | |
3061 | /* expecting a device which has a superblock */ | |
3062 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
3063 | if (IS_ERR(rdev)) { | |
3064 | printk(KERN_WARNING | |
3065 | "md: md_import_device returned %ld\n", | |
3066 | PTR_ERR(rdev)); | |
3067 | return PTR_ERR(rdev); | |
3068 | } | |
3069 | if (!list_empty(&mddev->disks)) { | |
3070 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
3071 | mdk_rdev_t, same_set); | |
3072 | int err = super_types[mddev->major_version] | |
3073 | .load_super(rdev, rdev0, mddev->minor_version); | |
3074 | if (err < 0) { | |
3075 | printk(KERN_WARNING | |
3076 | "md: %s has different UUID to %s\n", | |
3077 | bdevname(rdev->bdev,b), | |
3078 | bdevname(rdev0->bdev,b2)); | |
3079 | export_rdev(rdev); | |
3080 | return -EINVAL; | |
3081 | } | |
3082 | } | |
3083 | err = bind_rdev_to_array(rdev, mddev); | |
3084 | if (err) | |
3085 | export_rdev(rdev); | |
3086 | return err; | |
3087 | } | |
3088 | ||
3089 | /* | |
3090 | * add_new_disk can be used once the array is assembled | |
3091 | * to add "hot spares". They must already have a superblock | |
3092 | * written | |
3093 | */ | |
3094 | if (mddev->pers) { | |
3095 | int err; | |
3096 | if (!mddev->pers->hot_add_disk) { | |
3097 | printk(KERN_WARNING | |
3098 | "%s: personality does not support diskops!\n", | |
3099 | mdname(mddev)); | |
3100 | return -EINVAL; | |
3101 | } | |
7b1e35f6 N |
3102 | if (mddev->persistent) |
3103 | rdev = md_import_device(dev, mddev->major_version, | |
3104 | mddev->minor_version); | |
3105 | else | |
3106 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
3107 | if (IS_ERR(rdev)) { |
3108 | printk(KERN_WARNING | |
3109 | "md: md_import_device returned %ld\n", | |
3110 | PTR_ERR(rdev)); | |
3111 | return PTR_ERR(rdev); | |
3112 | } | |
41158c7e N |
3113 | /* set save_raid_disk if appropriate */ |
3114 | if (!mddev->persistent) { | |
3115 | if (info->state & (1<<MD_DISK_SYNC) && | |
3116 | info->raid_disk < mddev->raid_disks) | |
3117 | rdev->raid_disk = info->raid_disk; | |
3118 | else | |
3119 | rdev->raid_disk = -1; | |
3120 | } else | |
3121 | super_types[mddev->major_version]. | |
3122 | validate_super(mddev, rdev); | |
3123 | rdev->saved_raid_disk = rdev->raid_disk; | |
3124 | ||
b2d444d7 | 3125 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
3126 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
3127 | set_bit(WriteMostly, &rdev->flags); | |
3128 | ||
1da177e4 LT |
3129 | rdev->raid_disk = -1; |
3130 | err = bind_rdev_to_array(rdev, mddev); | |
3131 | if (err) | |
3132 | export_rdev(rdev); | |
c361777f N |
3133 | |
3134 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 3135 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
3136 | return err; |
3137 | } | |
3138 | ||
3139 | /* otherwise, add_new_disk is only allowed | |
3140 | * for major_version==0 superblocks | |
3141 | */ | |
3142 | if (mddev->major_version != 0) { | |
3143 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
3144 | mdname(mddev)); | |
3145 | return -EINVAL; | |
3146 | } | |
3147 | ||
3148 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
3149 | int err; | |
3150 | rdev = md_import_device (dev, -1, 0); | |
3151 | if (IS_ERR(rdev)) { | |
3152 | printk(KERN_WARNING | |
3153 | "md: error, md_import_device() returned %ld\n", | |
3154 | PTR_ERR(rdev)); | |
3155 | return PTR_ERR(rdev); | |
3156 | } | |
3157 | rdev->desc_nr = info->number; | |
3158 | if (info->raid_disk < mddev->raid_disks) | |
3159 | rdev->raid_disk = info->raid_disk; | |
3160 | else | |
3161 | rdev->raid_disk = -1; | |
3162 | ||
b2d444d7 N |
3163 | rdev->flags = 0; |
3164 | ||
1da177e4 | 3165 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
3166 | if (info->state & (1<<MD_DISK_SYNC)) |
3167 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 3168 | |
8ddf9efe N |
3169 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
3170 | set_bit(WriteMostly, &rdev->flags); | |
3171 | ||
1da177e4 LT |
3172 | if (!mddev->persistent) { |
3173 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
3174 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
3175 | } else | |
3176 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
3177 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
3178 | ||
2bf071bf N |
3179 | err = bind_rdev_to_array(rdev, mddev); |
3180 | if (err) { | |
3181 | export_rdev(rdev); | |
3182 | return err; | |
3183 | } | |
1da177e4 LT |
3184 | } |
3185 | ||
3186 | return 0; | |
3187 | } | |
3188 | ||
3189 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
3190 | { | |
3191 | char b[BDEVNAME_SIZE]; | |
3192 | mdk_rdev_t *rdev; | |
3193 | ||
3194 | if (!mddev->pers) | |
3195 | return -ENODEV; | |
3196 | ||
3197 | rdev = find_rdev(mddev, dev); | |
3198 | if (!rdev) | |
3199 | return -ENXIO; | |
3200 | ||
3201 | if (rdev->raid_disk >= 0) | |
3202 | goto busy; | |
3203 | ||
3204 | kick_rdev_from_array(rdev); | |
3205 | md_update_sb(mddev); | |
d7603b7e | 3206 | md_new_event(mddev); |
1da177e4 LT |
3207 | |
3208 | return 0; | |
3209 | busy: | |
3210 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", | |
3211 | bdevname(rdev->bdev,b), mdname(mddev)); | |
3212 | return -EBUSY; | |
3213 | } | |
3214 | ||
3215 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
3216 | { | |
3217 | char b[BDEVNAME_SIZE]; | |
3218 | int err; | |
3219 | unsigned int size; | |
3220 | mdk_rdev_t *rdev; | |
3221 | ||
3222 | if (!mddev->pers) | |
3223 | return -ENODEV; | |
3224 | ||
3225 | if (mddev->major_version != 0) { | |
3226 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
3227 | " version-0 superblocks.\n", | |
3228 | mdname(mddev)); | |
3229 | return -EINVAL; | |
3230 | } | |
3231 | if (!mddev->pers->hot_add_disk) { | |
3232 | printk(KERN_WARNING | |
3233 | "%s: personality does not support diskops!\n", | |
3234 | mdname(mddev)); | |
3235 | return -EINVAL; | |
3236 | } | |
3237 | ||
3238 | rdev = md_import_device (dev, -1, 0); | |
3239 | if (IS_ERR(rdev)) { | |
3240 | printk(KERN_WARNING | |
3241 | "md: error, md_import_device() returned %ld\n", | |
3242 | PTR_ERR(rdev)); | |
3243 | return -EINVAL; | |
3244 | } | |
3245 | ||
3246 | if (mddev->persistent) | |
3247 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
3248 | else | |
3249 | rdev->sb_offset = | |
3250 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
3251 | ||
3252 | size = calc_dev_size(rdev, mddev->chunk_size); | |
3253 | rdev->size = size; | |
3254 | ||
b2d444d7 | 3255 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
3256 | printk(KERN_WARNING |
3257 | "md: can not hot-add faulty %s disk to %s!\n", | |
3258 | bdevname(rdev->bdev,b), mdname(mddev)); | |
3259 | err = -EINVAL; | |
3260 | goto abort_export; | |
3261 | } | |
b2d444d7 | 3262 | clear_bit(In_sync, &rdev->flags); |
1da177e4 | 3263 | rdev->desc_nr = -1; |
2bf071bf N |
3264 | err = bind_rdev_to_array(rdev, mddev); |
3265 | if (err) | |
3266 | goto abort_export; | |
1da177e4 LT |
3267 | |
3268 | /* | |
3269 | * The rest should better be atomic, we can have disk failures | |
3270 | * noticed in interrupt contexts ... | |
3271 | */ | |
3272 | ||
3273 | if (rdev->desc_nr == mddev->max_disks) { | |
3274 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
3275 | mdname(mddev)); | |
3276 | err = -EBUSY; | |
3277 | goto abort_unbind_export; | |
3278 | } | |
3279 | ||
3280 | rdev->raid_disk = -1; | |
3281 | ||
3282 | md_update_sb(mddev); | |
3283 | ||
3284 | /* | |
3285 | * Kick recovery, maybe this spare has to be added to the | |
3286 | * array immediately. | |
3287 | */ | |
3288 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3289 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 3290 | md_new_event(mddev); |
1da177e4 LT |
3291 | return 0; |
3292 | ||
3293 | abort_unbind_export: | |
3294 | unbind_rdev_from_array(rdev); | |
3295 | ||
3296 | abort_export: | |
3297 | export_rdev(rdev); | |
3298 | return err; | |
3299 | } | |
3300 | ||
32a7627c N |
3301 | /* similar to deny_write_access, but accounts for our holding a reference |
3302 | * to the file ourselves */ | |
3303 | static int deny_bitmap_write_access(struct file * file) | |
3304 | { | |
3305 | struct inode *inode = file->f_mapping->host; | |
3306 | ||
3307 | spin_lock(&inode->i_lock); | |
3308 | if (atomic_read(&inode->i_writecount) > 1) { | |
3309 | spin_unlock(&inode->i_lock); | |
3310 | return -ETXTBSY; | |
3311 | } | |
3312 | atomic_set(&inode->i_writecount, -1); | |
3313 | spin_unlock(&inode->i_lock); | |
3314 | ||
3315 | return 0; | |
3316 | } | |
3317 | ||
3318 | static int set_bitmap_file(mddev_t *mddev, int fd) | |
3319 | { | |
3320 | int err; | |
3321 | ||
36fa3063 N |
3322 | if (mddev->pers) { |
3323 | if (!mddev->pers->quiesce) | |
3324 | return -EBUSY; | |
3325 | if (mddev->recovery || mddev->sync_thread) | |
3326 | return -EBUSY; | |
3327 | /* we should be able to change the bitmap.. */ | |
3328 | } | |
32a7627c | 3329 | |
32a7627c | 3330 | |
36fa3063 N |
3331 | if (fd >= 0) { |
3332 | if (mddev->bitmap) | |
3333 | return -EEXIST; /* cannot add when bitmap is present */ | |
3334 | mddev->bitmap_file = fget(fd); | |
32a7627c | 3335 | |
36fa3063 N |
3336 | if (mddev->bitmap_file == NULL) { |
3337 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
3338 | mdname(mddev)); | |
3339 | return -EBADF; | |
3340 | } | |
3341 | ||
3342 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
3343 | if (err) { | |
3344 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
3345 | mdname(mddev)); | |
3346 | fput(mddev->bitmap_file); | |
3347 | mddev->bitmap_file = NULL; | |
3348 | return err; | |
3349 | } | |
a654b9d8 | 3350 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
3351 | } else if (mddev->bitmap == NULL) |
3352 | return -ENOENT; /* cannot remove what isn't there */ | |
3353 | err = 0; | |
3354 | if (mddev->pers) { | |
3355 | mddev->pers->quiesce(mddev, 1); | |
3356 | if (fd >= 0) | |
3357 | err = bitmap_create(mddev); | |
3358 | if (fd < 0 || err) | |
3359 | bitmap_destroy(mddev); | |
3360 | mddev->pers->quiesce(mddev, 0); | |
3361 | } else if (fd < 0) { | |
3362 | if (mddev->bitmap_file) | |
3363 | fput(mddev->bitmap_file); | |
3364 | mddev->bitmap_file = NULL; | |
3365 | } | |
3366 | ||
32a7627c N |
3367 | return err; |
3368 | } | |
3369 | ||
1da177e4 LT |
3370 | /* |
3371 | * set_array_info is used two different ways | |
3372 | * The original usage is when creating a new array. | |
3373 | * In this usage, raid_disks is > 0 and it together with | |
3374 | * level, size, not_persistent,layout,chunksize determine the | |
3375 | * shape of the array. | |
3376 | * This will always create an array with a type-0.90.0 superblock. | |
3377 | * The newer usage is when assembling an array. | |
3378 | * In this case raid_disks will be 0, and the major_version field is | |
3379 | * use to determine which style super-blocks are to be found on the devices. | |
3380 | * The minor and patch _version numbers are also kept incase the | |
3381 | * super_block handler wishes to interpret them. | |
3382 | */ | |
3383 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
3384 | { | |
3385 | ||
3386 | if (info->raid_disks == 0) { | |
3387 | /* just setting version number for superblock loading */ | |
3388 | if (info->major_version < 0 || | |
3389 | info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || | |
3390 | super_types[info->major_version].name == NULL) { | |
3391 | /* maybe try to auto-load a module? */ | |
3392 | printk(KERN_INFO | |
3393 | "md: superblock version %d not known\n", | |
3394 | info->major_version); | |
3395 | return -EINVAL; | |
3396 | } | |
3397 | mddev->major_version = info->major_version; | |
3398 | mddev->minor_version = info->minor_version; | |
3399 | mddev->patch_version = info->patch_version; | |
3400 | return 0; | |
3401 | } | |
3402 | mddev->major_version = MD_MAJOR_VERSION; | |
3403 | mddev->minor_version = MD_MINOR_VERSION; | |
3404 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
3405 | mddev->ctime = get_seconds(); | |
3406 | ||
3407 | mddev->level = info->level; | |
17115e03 | 3408 | mddev->clevel[0] = 0; |
1da177e4 LT |
3409 | mddev->size = info->size; |
3410 | mddev->raid_disks = info->raid_disks; | |
3411 | /* don't set md_minor, it is determined by which /dev/md* was | |
3412 | * openned | |
3413 | */ | |
3414 | if (info->state & (1<<MD_SB_CLEAN)) | |
3415 | mddev->recovery_cp = MaxSector; | |
3416 | else | |
3417 | mddev->recovery_cp = 0; | |
3418 | mddev->persistent = ! info->not_persistent; | |
3419 | ||
3420 | mddev->layout = info->layout; | |
3421 | mddev->chunk_size = info->chunk_size; | |
3422 | ||
3423 | mddev->max_disks = MD_SB_DISKS; | |
3424 | ||
3425 | mddev->sb_dirty = 1; | |
3426 | ||
b2a2703c N |
3427 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
3428 | mddev->bitmap_offset = 0; | |
3429 | ||
1da177e4 LT |
3430 | /* |
3431 | * Generate a 128 bit UUID | |
3432 | */ | |
3433 | get_random_bytes(mddev->uuid, 16); | |
3434 | ||
3435 | return 0; | |
3436 | } | |
3437 | ||
a35b0d69 N |
3438 | static int update_size(mddev_t *mddev, unsigned long size) |
3439 | { | |
3440 | mdk_rdev_t * rdev; | |
3441 | int rv; | |
3442 | struct list_head *tmp; | |
3443 | ||
3444 | if (mddev->pers->resize == NULL) | |
3445 | return -EINVAL; | |
3446 | /* The "size" is the amount of each device that is used. | |
3447 | * This can only make sense for arrays with redundancy. | |
3448 | * linear and raid0 always use whatever space is available | |
3449 | * We can only consider changing the size if no resync | |
3450 | * or reconstruction is happening, and if the new size | |
3451 | * is acceptable. It must fit before the sb_offset or, | |
3452 | * if that is <data_offset, it must fit before the | |
3453 | * size of each device. | |
3454 | * If size is zero, we find the largest size that fits. | |
3455 | */ | |
3456 | if (mddev->sync_thread) | |
3457 | return -EBUSY; | |
3458 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3459 | sector_t avail; | |
3460 | int fit = (size == 0); | |
3461 | if (rdev->sb_offset > rdev->data_offset) | |
3462 | avail = (rdev->sb_offset*2) - rdev->data_offset; | |
3463 | else | |
3464 | avail = get_capacity(rdev->bdev->bd_disk) | |
3465 | - rdev->data_offset; | |
3466 | if (fit && (size == 0 || size > avail/2)) | |
3467 | size = avail/2; | |
3468 | if (avail < ((sector_t)size << 1)) | |
3469 | return -ENOSPC; | |
3470 | } | |
3471 | rv = mddev->pers->resize(mddev, (sector_t)size *2); | |
3472 | if (!rv) { | |
3473 | struct block_device *bdev; | |
3474 | ||
3475 | bdev = bdget_disk(mddev->gendisk, 0); | |
3476 | if (bdev) { | |
1b1dcc1b | 3477 | mutex_lock(&bdev->bd_inode->i_mutex); |
6d89332b | 3478 | i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10); |
1b1dcc1b | 3479 | mutex_unlock(&bdev->bd_inode->i_mutex); |
a35b0d69 N |
3480 | bdput(bdev); |
3481 | } | |
3482 | } | |
3483 | return rv; | |
3484 | } | |
3485 | ||
da943b99 N |
3486 | static int update_raid_disks(mddev_t *mddev, int raid_disks) |
3487 | { | |
3488 | int rv; | |
3489 | /* change the number of raid disks */ | |
3490 | if (mddev->pers->reshape == NULL) | |
3491 | return -EINVAL; | |
3492 | if (raid_disks <= 0 || | |
3493 | raid_disks >= mddev->max_disks) | |
3494 | return -EINVAL; | |
3495 | if (mddev->sync_thread) | |
3496 | return -EBUSY; | |
3497 | rv = mddev->pers->reshape(mddev, raid_disks); | |
da943b99 N |
3498 | return rv; |
3499 | } | |
3500 | ||
3501 | ||
1da177e4 LT |
3502 | /* |
3503 | * update_array_info is used to change the configuration of an | |
3504 | * on-line array. | |
3505 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
3506 | * fields in the info are checked against the array. | |
3507 | * Any differences that cannot be handled will cause an error. | |
3508 | * Normally, only one change can be managed at a time. | |
3509 | */ | |
3510 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
3511 | { | |
3512 | int rv = 0; | |
3513 | int cnt = 0; | |
36fa3063 N |
3514 | int state = 0; |
3515 | ||
3516 | /* calculate expected state,ignoring low bits */ | |
3517 | if (mddev->bitmap && mddev->bitmap_offset) | |
3518 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
3519 | |
3520 | if (mddev->major_version != info->major_version || | |
3521 | mddev->minor_version != info->minor_version || | |
3522 | /* mddev->patch_version != info->patch_version || */ | |
3523 | mddev->ctime != info->ctime || | |
3524 | mddev->level != info->level || | |
3525 | /* mddev->layout != info->layout || */ | |
3526 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
3527 | mddev->chunk_size != info->chunk_size || |
3528 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
3529 | ((state^info->state) & 0xfffffe00) | |
3530 | ) | |
1da177e4 LT |
3531 | return -EINVAL; |
3532 | /* Check there is only one change */ | |
284ae7ca | 3533 | if (info->size >= 0 && mddev->size != info->size) cnt++; |
1da177e4 LT |
3534 | if (mddev->raid_disks != info->raid_disks) cnt++; |
3535 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 3536 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
3537 | if (cnt == 0) return 0; |
3538 | if (cnt > 1) return -EINVAL; | |
3539 | ||
3540 | if (mddev->layout != info->layout) { | |
3541 | /* Change layout | |
3542 | * we don't need to do anything at the md level, the | |
3543 | * personality will take care of it all. | |
3544 | */ | |
3545 | if (mddev->pers->reconfig == NULL) | |
3546 | return -EINVAL; | |
3547 | else | |
3548 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
3549 | } | |
284ae7ca | 3550 | if (info->size >= 0 && mddev->size != info->size) |
a35b0d69 N |
3551 | rv = update_size(mddev, info->size); |
3552 | ||
da943b99 N |
3553 | if (mddev->raid_disks != info->raid_disks) |
3554 | rv = update_raid_disks(mddev, info->raid_disks); | |
3555 | ||
36fa3063 N |
3556 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
3557 | if (mddev->pers->quiesce == NULL) | |
3558 | return -EINVAL; | |
3559 | if (mddev->recovery || mddev->sync_thread) | |
3560 | return -EBUSY; | |
3561 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
3562 | /* add the bitmap */ | |
3563 | if (mddev->bitmap) | |
3564 | return -EEXIST; | |
3565 | if (mddev->default_bitmap_offset == 0) | |
3566 | return -EINVAL; | |
3567 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
3568 | mddev->pers->quiesce(mddev, 1); | |
3569 | rv = bitmap_create(mddev); | |
3570 | if (rv) | |
3571 | bitmap_destroy(mddev); | |
3572 | mddev->pers->quiesce(mddev, 0); | |
3573 | } else { | |
3574 | /* remove the bitmap */ | |
3575 | if (!mddev->bitmap) | |
3576 | return -ENOENT; | |
3577 | if (mddev->bitmap->file) | |
3578 | return -EINVAL; | |
3579 | mddev->pers->quiesce(mddev, 1); | |
3580 | bitmap_destroy(mddev); | |
3581 | mddev->pers->quiesce(mddev, 0); | |
3582 | mddev->bitmap_offset = 0; | |
3583 | } | |
3584 | } | |
1da177e4 LT |
3585 | md_update_sb(mddev); |
3586 | return rv; | |
3587 | } | |
3588 | ||
3589 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
3590 | { | |
3591 | mdk_rdev_t *rdev; | |
3592 | ||
3593 | if (mddev->pers == NULL) | |
3594 | return -ENODEV; | |
3595 | ||
3596 | rdev = find_rdev(mddev, dev); | |
3597 | if (!rdev) | |
3598 | return -ENODEV; | |
3599 | ||
3600 | md_error(mddev, rdev); | |
3601 | return 0; | |
3602 | } | |
3603 | ||
a885c8c4 CH |
3604 | static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo) |
3605 | { | |
3606 | mddev_t *mddev = bdev->bd_disk->private_data; | |
3607 | ||
3608 | geo->heads = 2; | |
3609 | geo->sectors = 4; | |
3610 | geo->cylinders = get_capacity(mddev->gendisk) / 8; | |
3611 | return 0; | |
3612 | } | |
3613 | ||
1da177e4 LT |
3614 | static int md_ioctl(struct inode *inode, struct file *file, |
3615 | unsigned int cmd, unsigned long arg) | |
3616 | { | |
3617 | int err = 0; | |
3618 | void __user *argp = (void __user *)arg; | |
1da177e4 LT |
3619 | mddev_t *mddev = NULL; |
3620 | ||
3621 | if (!capable(CAP_SYS_ADMIN)) | |
3622 | return -EACCES; | |
3623 | ||
3624 | /* | |
3625 | * Commands dealing with the RAID driver but not any | |
3626 | * particular array: | |
3627 | */ | |
3628 | switch (cmd) | |
3629 | { | |
3630 | case RAID_VERSION: | |
3631 | err = get_version(argp); | |
3632 | goto done; | |
3633 | ||
3634 | case PRINT_RAID_DEBUG: | |
3635 | err = 0; | |
3636 | md_print_devices(); | |
3637 | goto done; | |
3638 | ||
3639 | #ifndef MODULE | |
3640 | case RAID_AUTORUN: | |
3641 | err = 0; | |
3642 | autostart_arrays(arg); | |
3643 | goto done; | |
3644 | #endif | |
3645 | default:; | |
3646 | } | |
3647 | ||
3648 | /* | |
3649 | * Commands creating/starting a new array: | |
3650 | */ | |
3651 | ||
3652 | mddev = inode->i_bdev->bd_disk->private_data; | |
3653 | ||
3654 | if (!mddev) { | |
3655 | BUG(); | |
3656 | goto abort; | |
3657 | } | |
3658 | ||
3659 | ||
3660 | if (cmd == START_ARRAY) { | |
3661 | /* START_ARRAY doesn't need to lock the array as autostart_array | |
3662 | * does the locking, and it could even be a different array | |
3663 | */ | |
3664 | static int cnt = 3; | |
3665 | if (cnt > 0 ) { | |
3666 | printk(KERN_WARNING | |
3667 | "md: %s(pid %d) used deprecated START_ARRAY ioctl. " | |
e8a00334 | 3668 | "This will not be supported beyond July 2006\n", |
1da177e4 LT |
3669 | current->comm, current->pid); |
3670 | cnt--; | |
3671 | } | |
3672 | err = autostart_array(new_decode_dev(arg)); | |
3673 | if (err) { | |
3674 | printk(KERN_WARNING "md: autostart failed!\n"); | |
3675 | goto abort; | |
3676 | } | |
3677 | goto done; | |
3678 | } | |
3679 | ||
3680 | err = mddev_lock(mddev); | |
3681 | if (err) { | |
3682 | printk(KERN_INFO | |
3683 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
3684 | err, cmd); | |
3685 | goto abort; | |
3686 | } | |
3687 | ||
3688 | switch (cmd) | |
3689 | { | |
3690 | case SET_ARRAY_INFO: | |
3691 | { | |
3692 | mdu_array_info_t info; | |
3693 | if (!arg) | |
3694 | memset(&info, 0, sizeof(info)); | |
3695 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
3696 | err = -EFAULT; | |
3697 | goto abort_unlock; | |
3698 | } | |
3699 | if (mddev->pers) { | |
3700 | err = update_array_info(mddev, &info); | |
3701 | if (err) { | |
3702 | printk(KERN_WARNING "md: couldn't update" | |
3703 | " array info. %d\n", err); | |
3704 | goto abort_unlock; | |
3705 | } | |
3706 | goto done_unlock; | |
3707 | } | |
3708 | if (!list_empty(&mddev->disks)) { | |
3709 | printk(KERN_WARNING | |
3710 | "md: array %s already has disks!\n", | |
3711 | mdname(mddev)); | |
3712 | err = -EBUSY; | |
3713 | goto abort_unlock; | |
3714 | } | |
3715 | if (mddev->raid_disks) { | |
3716 | printk(KERN_WARNING | |
3717 | "md: array %s already initialised!\n", | |
3718 | mdname(mddev)); | |
3719 | err = -EBUSY; | |
3720 | goto abort_unlock; | |
3721 | } | |
3722 | err = set_array_info(mddev, &info); | |
3723 | if (err) { | |
3724 | printk(KERN_WARNING "md: couldn't set" | |
3725 | " array info. %d\n", err); | |
3726 | goto abort_unlock; | |
3727 | } | |
3728 | } | |
3729 | goto done_unlock; | |
3730 | ||
3731 | default:; | |
3732 | } | |
3733 | ||
3734 | /* | |
3735 | * Commands querying/configuring an existing array: | |
3736 | */ | |
32a7627c N |
3737 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3738 | * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ | |
3739 | if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
3740 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { | |
1da177e4 LT |
3741 | err = -ENODEV; |
3742 | goto abort_unlock; | |
3743 | } | |
3744 | ||
3745 | /* | |
3746 | * Commands even a read-only array can execute: | |
3747 | */ | |
3748 | switch (cmd) | |
3749 | { | |
3750 | case GET_ARRAY_INFO: | |
3751 | err = get_array_info(mddev, argp); | |
3752 | goto done_unlock; | |
3753 | ||
32a7627c | 3754 | case GET_BITMAP_FILE: |
87162a28 | 3755 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
3756 | goto done_unlock; |
3757 | ||
1da177e4 LT |
3758 | case GET_DISK_INFO: |
3759 | err = get_disk_info(mddev, argp); | |
3760 | goto done_unlock; | |
3761 | ||
3762 | case RESTART_ARRAY_RW: | |
3763 | err = restart_array(mddev); | |
3764 | goto done_unlock; | |
3765 | ||
3766 | case STOP_ARRAY: | |
3767 | err = do_md_stop (mddev, 0); | |
3768 | goto done_unlock; | |
3769 | ||
3770 | case STOP_ARRAY_RO: | |
3771 | err = do_md_stop (mddev, 1); | |
3772 | goto done_unlock; | |
3773 | ||
3774 | /* | |
3775 | * We have a problem here : there is no easy way to give a CHS | |
3776 | * virtual geometry. We currently pretend that we have a 2 heads | |
3777 | * 4 sectors (with a BIG number of cylinders...). This drives | |
3778 | * dosfs just mad... ;-) | |
3779 | */ | |
1da177e4 LT |
3780 | } |
3781 | ||
3782 | /* | |
3783 | * The remaining ioctls are changing the state of the | |
f91de92e N |
3784 | * superblock, so we do not allow them on read-only arrays. |
3785 | * However non-MD ioctls (e.g. get-size) will still come through | |
3786 | * here and hit the 'default' below, so only disallow | |
3787 | * 'md' ioctls, and switch to rw mode if started auto-readonly. | |
1da177e4 | 3788 | */ |
f91de92e N |
3789 | if (_IOC_TYPE(cmd) == MD_MAJOR && |
3790 | mddev->ro && mddev->pers) { | |
3791 | if (mddev->ro == 2) { | |
3792 | mddev->ro = 0; | |
3793 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3794 | md_wakeup_thread(mddev->thread); | |
3795 | ||
3796 | } else { | |
3797 | err = -EROFS; | |
3798 | goto abort_unlock; | |
3799 | } | |
1da177e4 LT |
3800 | } |
3801 | ||
3802 | switch (cmd) | |
3803 | { | |
3804 | case ADD_NEW_DISK: | |
3805 | { | |
3806 | mdu_disk_info_t info; | |
3807 | if (copy_from_user(&info, argp, sizeof(info))) | |
3808 | err = -EFAULT; | |
3809 | else | |
3810 | err = add_new_disk(mddev, &info); | |
3811 | goto done_unlock; | |
3812 | } | |
3813 | ||
3814 | case HOT_REMOVE_DISK: | |
3815 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3816 | goto done_unlock; | |
3817 | ||
3818 | case HOT_ADD_DISK: | |
3819 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3820 | goto done_unlock; | |
3821 | ||
3822 | case SET_DISK_FAULTY: | |
3823 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3824 | goto done_unlock; | |
3825 | ||
3826 | case RUN_ARRAY: | |
3827 | err = do_md_run (mddev); | |
3828 | goto done_unlock; | |
3829 | ||
32a7627c N |
3830 | case SET_BITMAP_FILE: |
3831 | err = set_bitmap_file(mddev, (int)arg); | |
3832 | goto done_unlock; | |
3833 | ||
1da177e4 LT |
3834 | default: |
3835 | if (_IOC_TYPE(cmd) == MD_MAJOR) | |
3836 | printk(KERN_WARNING "md: %s(pid %d) used" | |
3837 | " obsolete MD ioctl, upgrade your" | |
3838 | " software to use new ictls.\n", | |
3839 | current->comm, current->pid); | |
3840 | err = -EINVAL; | |
3841 | goto abort_unlock; | |
3842 | } | |
3843 | ||
3844 | done_unlock: | |
3845 | abort_unlock: | |
3846 | mddev_unlock(mddev); | |
3847 | ||
3848 | return err; | |
3849 | done: | |
3850 | if (err) | |
3851 | MD_BUG(); | |
3852 | abort: | |
3853 | return err; | |
3854 | } | |
3855 | ||
3856 | static int md_open(struct inode *inode, struct file *file) | |
3857 | { | |
3858 | /* | |
3859 | * Succeed if we can lock the mddev, which confirms that | |
3860 | * it isn't being stopped right now. | |
3861 | */ | |
3862 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3863 | int err; | |
3864 | ||
3865 | if ((err = mddev_lock(mddev))) | |
3866 | goto out; | |
3867 | ||
3868 | err = 0; | |
3869 | mddev_get(mddev); | |
3870 | mddev_unlock(mddev); | |
3871 | ||
3872 | check_disk_change(inode->i_bdev); | |
3873 | out: | |
3874 | return err; | |
3875 | } | |
3876 | ||
3877 | static int md_release(struct inode *inode, struct file * file) | |
3878 | { | |
3879 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3880 | ||
3881 | if (!mddev) | |
3882 | BUG(); | |
3883 | mddev_put(mddev); | |
3884 | ||
3885 | return 0; | |
3886 | } | |
3887 | ||
3888 | static int md_media_changed(struct gendisk *disk) | |
3889 | { | |
3890 | mddev_t *mddev = disk->private_data; | |
3891 | ||
3892 | return mddev->changed; | |
3893 | } | |
3894 | ||
3895 | static int md_revalidate(struct gendisk *disk) | |
3896 | { | |
3897 | mddev_t *mddev = disk->private_data; | |
3898 | ||
3899 | mddev->changed = 0; | |
3900 | return 0; | |
3901 | } | |
3902 | static struct block_device_operations md_fops = | |
3903 | { | |
3904 | .owner = THIS_MODULE, | |
3905 | .open = md_open, | |
3906 | .release = md_release, | |
3907 | .ioctl = md_ioctl, | |
a885c8c4 | 3908 | .getgeo = md_getgeo, |
1da177e4 LT |
3909 | .media_changed = md_media_changed, |
3910 | .revalidate_disk= md_revalidate, | |
3911 | }; | |
3912 | ||
75c96f85 | 3913 | static int md_thread(void * arg) |
1da177e4 LT |
3914 | { |
3915 | mdk_thread_t *thread = arg; | |
3916 | ||
1da177e4 LT |
3917 | /* |
3918 | * md_thread is a 'system-thread', it's priority should be very | |
3919 | * high. We avoid resource deadlocks individually in each | |
3920 | * raid personality. (RAID5 does preallocation) We also use RR and | |
3921 | * the very same RT priority as kswapd, thus we will never get | |
3922 | * into a priority inversion deadlock. | |
3923 | * | |
3924 | * we definitely have to have equal or higher priority than | |
3925 | * bdflush, otherwise bdflush will deadlock if there are too | |
3926 | * many dirty RAID5 blocks. | |
3927 | */ | |
1da177e4 | 3928 | |
6985c43f | 3929 | allow_signal(SIGKILL); |
a6fb0934 | 3930 | while (!kthread_should_stop()) { |
1da177e4 | 3931 | |
93588e22 N |
3932 | /* We need to wait INTERRUPTIBLE so that |
3933 | * we don't add to the load-average. | |
3934 | * That means we need to be sure no signals are | |
3935 | * pending | |
3936 | */ | |
3937 | if (signal_pending(current)) | |
3938 | flush_signals(current); | |
3939 | ||
3940 | wait_event_interruptible_timeout | |
3941 | (thread->wqueue, | |
3942 | test_bit(THREAD_WAKEUP, &thread->flags) | |
3943 | || kthread_should_stop(), | |
3944 | thread->timeout); | |
3e1d1d28 | 3945 | try_to_freeze(); |
1da177e4 LT |
3946 | |
3947 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
3948 | ||
787453c2 | 3949 | thread->run(thread->mddev); |
1da177e4 | 3950 | } |
a6fb0934 | 3951 | |
1da177e4 LT |
3952 | return 0; |
3953 | } | |
3954 | ||
3955 | void md_wakeup_thread(mdk_thread_t *thread) | |
3956 | { | |
3957 | if (thread) { | |
3958 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
3959 | set_bit(THREAD_WAKEUP, &thread->flags); | |
3960 | wake_up(&thread->wqueue); | |
3961 | } | |
3962 | } | |
3963 | ||
3964 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
3965 | const char *name) | |
3966 | { | |
3967 | mdk_thread_t *thread; | |
1da177e4 | 3968 | |
9ffae0cf | 3969 | thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
3970 | if (!thread) |
3971 | return NULL; | |
3972 | ||
1da177e4 LT |
3973 | init_waitqueue_head(&thread->wqueue); |
3974 | ||
1da177e4 LT |
3975 | thread->run = run; |
3976 | thread->mddev = mddev; | |
32a7627c | 3977 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 3978 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 3979 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
3980 | kfree(thread); |
3981 | return NULL; | |
3982 | } | |
1da177e4 LT |
3983 | return thread; |
3984 | } | |
3985 | ||
1da177e4 LT |
3986 | void md_unregister_thread(mdk_thread_t *thread) |
3987 | { | |
d28446fe | 3988 | dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); |
a6fb0934 N |
3989 | |
3990 | kthread_stop(thread->tsk); | |
1da177e4 LT |
3991 | kfree(thread); |
3992 | } | |
3993 | ||
3994 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
3995 | { | |
3996 | if (!mddev) { | |
3997 | MD_BUG(); | |
3998 | return; | |
3999 | } | |
4000 | ||
b2d444d7 | 4001 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 4002 | return; |
32a7627c | 4003 | /* |
1da177e4 LT |
4004 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
4005 | mdname(mddev), | |
4006 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
4007 | __builtin_return_address(0),__builtin_return_address(1), | |
4008 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 4009 | */ |
1da177e4 LT |
4010 | if (!mddev->pers->error_handler) |
4011 | return; | |
4012 | mddev->pers->error_handler(mddev,rdev); | |
4013 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4014 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4015 | md_wakeup_thread(mddev->thread); | |
d7603b7e | 4016 | md_new_event(mddev); |
1da177e4 LT |
4017 | } |
4018 | ||
4019 | /* seq_file implementation /proc/mdstat */ | |
4020 | ||
4021 | static void status_unused(struct seq_file *seq) | |
4022 | { | |
4023 | int i = 0; | |
4024 | mdk_rdev_t *rdev; | |
4025 | struct list_head *tmp; | |
4026 | ||
4027 | seq_printf(seq, "unused devices: "); | |
4028 | ||
4029 | ITERATE_RDEV_PENDING(rdev,tmp) { | |
4030 | char b[BDEVNAME_SIZE]; | |
4031 | i++; | |
4032 | seq_printf(seq, "%s ", | |
4033 | bdevname(rdev->bdev,b)); | |
4034 | } | |
4035 | if (!i) | |
4036 | seq_printf(seq, "<none>"); | |
4037 | ||
4038 | seq_printf(seq, "\n"); | |
4039 | } | |
4040 | ||
4041 | ||
4042 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
4043 | { | |
4044 | unsigned long max_blocks, resync, res, dt, db, rt; | |
4045 | ||
4046 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
4047 | ||
4048 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4049 | max_blocks = mddev->resync_max_sectors >> 1; | |
4050 | else | |
4051 | max_blocks = mddev->size; | |
4052 | ||
4053 | /* | |
4054 | * Should not happen. | |
4055 | */ | |
4056 | if (!max_blocks) { | |
4057 | MD_BUG(); | |
4058 | return; | |
4059 | } | |
4060 | res = (resync/1024)*1000/(max_blocks/1024 + 1); | |
4061 | { | |
4062 | int i, x = res/50, y = 20-x; | |
4063 | seq_printf(seq, "["); | |
4064 | for (i = 0; i < x; i++) | |
4065 | seq_printf(seq, "="); | |
4066 | seq_printf(seq, ">"); | |
4067 | for (i = 0; i < y; i++) | |
4068 | seq_printf(seq, "."); | |
4069 | seq_printf(seq, "] "); | |
4070 | } | |
4071 | seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", | |
4072 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
4073 | "resync" : "recovery"), | |
4074 | res/10, res % 10, resync, max_blocks); | |
4075 | ||
4076 | /* | |
4077 | * We do not want to overflow, so the order of operands and | |
4078 | * the * 100 / 100 trick are important. We do a +1 to be | |
4079 | * safe against division by zero. We only estimate anyway. | |
4080 | * | |
4081 | * dt: time from mark until now | |
4082 | * db: blocks written from mark until now | |
4083 | * rt: remaining time | |
4084 | */ | |
4085 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
4086 | if (!dt) dt++; | |
4087 | db = resync - (mddev->resync_mark_cnt/2); | |
4088 | rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; | |
4089 | ||
4090 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
4091 | ||
4092 | seq_printf(seq, " speed=%ldK/sec", db/dt); | |
4093 | } | |
4094 | ||
4095 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
4096 | { | |
4097 | struct list_head *tmp; | |
4098 | loff_t l = *pos; | |
4099 | mddev_t *mddev; | |
4100 | ||
4101 | if (l >= 0x10000) | |
4102 | return NULL; | |
4103 | if (!l--) | |
4104 | /* header */ | |
4105 | return (void*)1; | |
4106 | ||
4107 | spin_lock(&all_mddevs_lock); | |
4108 | list_for_each(tmp,&all_mddevs) | |
4109 | if (!l--) { | |
4110 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
4111 | mddev_get(mddev); | |
4112 | spin_unlock(&all_mddevs_lock); | |
4113 | return mddev; | |
4114 | } | |
4115 | spin_unlock(&all_mddevs_lock); | |
4116 | if (!l--) | |
4117 | return (void*)2;/* tail */ | |
4118 | return NULL; | |
4119 | } | |
4120 | ||
4121 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
4122 | { | |
4123 | struct list_head *tmp; | |
4124 | mddev_t *next_mddev, *mddev = v; | |
4125 | ||
4126 | ++*pos; | |
4127 | if (v == (void*)2) | |
4128 | return NULL; | |
4129 | ||
4130 | spin_lock(&all_mddevs_lock); | |
4131 | if (v == (void*)1) | |
4132 | tmp = all_mddevs.next; | |
4133 | else | |
4134 | tmp = mddev->all_mddevs.next; | |
4135 | if (tmp != &all_mddevs) | |
4136 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
4137 | else { | |
4138 | next_mddev = (void*)2; | |
4139 | *pos = 0x10000; | |
4140 | } | |
4141 | spin_unlock(&all_mddevs_lock); | |
4142 | ||
4143 | if (v != (void*)1) | |
4144 | mddev_put(mddev); | |
4145 | return next_mddev; | |
4146 | ||
4147 | } | |
4148 | ||
4149 | static void md_seq_stop(struct seq_file *seq, void *v) | |
4150 | { | |
4151 | mddev_t *mddev = v; | |
4152 | ||
4153 | if (mddev && v != (void*)1 && v != (void*)2) | |
4154 | mddev_put(mddev); | |
4155 | } | |
4156 | ||
d7603b7e N |
4157 | struct mdstat_info { |
4158 | int event; | |
4159 | }; | |
4160 | ||
1da177e4 LT |
4161 | static int md_seq_show(struct seq_file *seq, void *v) |
4162 | { | |
4163 | mddev_t *mddev = v; | |
4164 | sector_t size; | |
4165 | struct list_head *tmp2; | |
4166 | mdk_rdev_t *rdev; | |
d7603b7e | 4167 | struct mdstat_info *mi = seq->private; |
32a7627c | 4168 | struct bitmap *bitmap; |
1da177e4 LT |
4169 | |
4170 | if (v == (void*)1) { | |
2604b703 | 4171 | struct mdk_personality *pers; |
1da177e4 LT |
4172 | seq_printf(seq, "Personalities : "); |
4173 | spin_lock(&pers_lock); | |
2604b703 N |
4174 | list_for_each_entry(pers, &pers_list, list) |
4175 | seq_printf(seq, "[%s] ", pers->name); | |
1da177e4 LT |
4176 | |
4177 | spin_unlock(&pers_lock); | |
4178 | seq_printf(seq, "\n"); | |
d7603b7e | 4179 | mi->event = atomic_read(&md_event_count); |
1da177e4 LT |
4180 | return 0; |
4181 | } | |
4182 | if (v == (void*)2) { | |
4183 | status_unused(seq); | |
4184 | return 0; | |
4185 | } | |
4186 | ||
4187 | if (mddev_lock(mddev)!=0) | |
4188 | return -EINTR; | |
4189 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { | |
4190 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
4191 | mddev->pers ? "" : "in"); | |
4192 | if (mddev->pers) { | |
f91de92e | 4193 | if (mddev->ro==1) |
1da177e4 | 4194 | seq_printf(seq, " (read-only)"); |
f91de92e N |
4195 | if (mddev->ro==2) |
4196 | seq_printf(seq, "(auto-read-only)"); | |
1da177e4 LT |
4197 | seq_printf(seq, " %s", mddev->pers->name); |
4198 | } | |
4199 | ||
4200 | size = 0; | |
4201 | ITERATE_RDEV(mddev,rdev,tmp2) { | |
4202 | char b[BDEVNAME_SIZE]; | |
4203 | seq_printf(seq, " %s[%d]", | |
4204 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
4205 | if (test_bit(WriteMostly, &rdev->flags)) |
4206 | seq_printf(seq, "(W)"); | |
b2d444d7 | 4207 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4208 | seq_printf(seq, "(F)"); |
4209 | continue; | |
b325a32e N |
4210 | } else if (rdev->raid_disk < 0) |
4211 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
4212 | size += rdev->size; |
4213 | } | |
4214 | ||
4215 | if (!list_empty(&mddev->disks)) { | |
4216 | if (mddev->pers) | |
4217 | seq_printf(seq, "\n %llu blocks", | |
4218 | (unsigned long long)mddev->array_size); | |
4219 | else | |
4220 | seq_printf(seq, "\n %llu blocks", | |
4221 | (unsigned long long)size); | |
4222 | } | |
1cd6bf19 N |
4223 | if (mddev->persistent) { |
4224 | if (mddev->major_version != 0 || | |
4225 | mddev->minor_version != 90) { | |
4226 | seq_printf(seq," super %d.%d", | |
4227 | mddev->major_version, | |
4228 | mddev->minor_version); | |
4229 | } | |
4230 | } else | |
4231 | seq_printf(seq, " super non-persistent"); | |
1da177e4 LT |
4232 | |
4233 | if (mddev->pers) { | |
4234 | mddev->pers->status (seq, mddev); | |
4235 | seq_printf(seq, "\n "); | |
8e1b39d6 N |
4236 | if (mddev->pers->sync_request) { |
4237 | if (mddev->curr_resync > 2) { | |
4238 | status_resync (seq, mddev); | |
4239 | seq_printf(seq, "\n "); | |
4240 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
4241 | seq_printf(seq, "\tresync=DELAYED\n "); | |
4242 | else if (mddev->recovery_cp < MaxSector) | |
4243 | seq_printf(seq, "\tresync=PENDING\n "); | |
4244 | } | |
32a7627c N |
4245 | } else |
4246 | seq_printf(seq, "\n "); | |
4247 | ||
4248 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
4249 | unsigned long chunk_kb; |
4250 | unsigned long flags; | |
32a7627c N |
4251 | spin_lock_irqsave(&bitmap->lock, flags); |
4252 | chunk_kb = bitmap->chunksize >> 10; | |
4253 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
4254 | "%lu%s chunk", | |
4255 | bitmap->pages - bitmap->missing_pages, | |
4256 | bitmap->pages, | |
4257 | (bitmap->pages - bitmap->missing_pages) | |
4258 | << (PAGE_SHIFT - 10), | |
4259 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
4260 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
4261 | if (bitmap->file) { |
4262 | seq_printf(seq, ", file: "); | |
4263 | seq_path(seq, bitmap->file->f_vfsmnt, | |
4264 | bitmap->file->f_dentry," \t\n"); | |
32a7627c | 4265 | } |
78d742d8 | 4266 | |
32a7627c N |
4267 | seq_printf(seq, "\n"); |
4268 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
4269 | } |
4270 | ||
4271 | seq_printf(seq, "\n"); | |
4272 | } | |
4273 | mddev_unlock(mddev); | |
4274 | ||
4275 | return 0; | |
4276 | } | |
4277 | ||
4278 | static struct seq_operations md_seq_ops = { | |
4279 | .start = md_seq_start, | |
4280 | .next = md_seq_next, | |
4281 | .stop = md_seq_stop, | |
4282 | .show = md_seq_show, | |
4283 | }; | |
4284 | ||
4285 | static int md_seq_open(struct inode *inode, struct file *file) | |
4286 | { | |
4287 | int error; | |
d7603b7e N |
4288 | struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL); |
4289 | if (mi == NULL) | |
4290 | return -ENOMEM; | |
1da177e4 LT |
4291 | |
4292 | error = seq_open(file, &md_seq_ops); | |
d7603b7e N |
4293 | if (error) |
4294 | kfree(mi); | |
4295 | else { | |
4296 | struct seq_file *p = file->private_data; | |
4297 | p->private = mi; | |
4298 | mi->event = atomic_read(&md_event_count); | |
4299 | } | |
1da177e4 LT |
4300 | return error; |
4301 | } | |
4302 | ||
d7603b7e N |
4303 | static int md_seq_release(struct inode *inode, struct file *file) |
4304 | { | |
4305 | struct seq_file *m = file->private_data; | |
4306 | struct mdstat_info *mi = m->private; | |
4307 | m->private = NULL; | |
4308 | kfree(mi); | |
4309 | return seq_release(inode, file); | |
4310 | } | |
4311 | ||
4312 | static unsigned int mdstat_poll(struct file *filp, poll_table *wait) | |
4313 | { | |
4314 | struct seq_file *m = filp->private_data; | |
4315 | struct mdstat_info *mi = m->private; | |
4316 | int mask; | |
4317 | ||
4318 | poll_wait(filp, &md_event_waiters, wait); | |
4319 | ||
4320 | /* always allow read */ | |
4321 | mask = POLLIN | POLLRDNORM; | |
4322 | ||
4323 | if (mi->event != atomic_read(&md_event_count)) | |
4324 | mask |= POLLERR | POLLPRI; | |
4325 | return mask; | |
4326 | } | |
4327 | ||
1da177e4 LT |
4328 | static struct file_operations md_seq_fops = { |
4329 | .open = md_seq_open, | |
4330 | .read = seq_read, | |
4331 | .llseek = seq_lseek, | |
d7603b7e N |
4332 | .release = md_seq_release, |
4333 | .poll = mdstat_poll, | |
1da177e4 LT |
4334 | }; |
4335 | ||
2604b703 | 4336 | int register_md_personality(struct mdk_personality *p) |
1da177e4 | 4337 | { |
1da177e4 | 4338 | spin_lock(&pers_lock); |
2604b703 N |
4339 | list_add_tail(&p->list, &pers_list); |
4340 | printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level); | |
1da177e4 LT |
4341 | spin_unlock(&pers_lock); |
4342 | return 0; | |
4343 | } | |
4344 | ||
2604b703 | 4345 | int unregister_md_personality(struct mdk_personality *p) |
1da177e4 | 4346 | { |
2604b703 | 4347 | printk(KERN_INFO "md: %s personality unregistered\n", p->name); |
1da177e4 | 4348 | spin_lock(&pers_lock); |
2604b703 | 4349 | list_del_init(&p->list); |
1da177e4 LT |
4350 | spin_unlock(&pers_lock); |
4351 | return 0; | |
4352 | } | |
4353 | ||
4354 | static int is_mddev_idle(mddev_t *mddev) | |
4355 | { | |
4356 | mdk_rdev_t * rdev; | |
4357 | struct list_head *tmp; | |
4358 | int idle; | |
4359 | unsigned long curr_events; | |
4360 | ||
4361 | idle = 1; | |
4362 | ITERATE_RDEV(mddev,rdev,tmp) { | |
4363 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
a362357b JA |
4364 | curr_events = disk_stat_read(disk, sectors[0]) + |
4365 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 | 4366 | atomic_read(&disk->sync_io); |
c0e48521 N |
4367 | /* The difference between curr_events and last_events |
4368 | * will be affected by any new non-sync IO (making | |
4369 | * curr_events bigger) and any difference in the amount of | |
4370 | * in-flight syncio (making current_events bigger or smaller) | |
4371 | * The amount in-flight is currently limited to | |
4372 | * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6 | |
4373 | * which is at most 4096 sectors. | |
4374 | * These numbers are fairly fragile and should be made | |
4375 | * more robust, probably by enforcing the | |
4376 | * 'window size' that md_do_sync sort-of uses. | |
4377 | * | |
1da177e4 LT |
4378 | * Note: the following is an unsigned comparison. |
4379 | */ | |
c0e48521 | 4380 | if ((curr_events - rdev->last_events + 4096) > 8192) { |
1da177e4 LT |
4381 | rdev->last_events = curr_events; |
4382 | idle = 0; | |
4383 | } | |
4384 | } | |
4385 | return idle; | |
4386 | } | |
4387 | ||
4388 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
4389 | { | |
4390 | /* another "blocks" (512byte) blocks have been synced */ | |
4391 | atomic_sub(blocks, &mddev->recovery_active); | |
4392 | wake_up(&mddev->recovery_wait); | |
4393 | if (!ok) { | |
4394 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
4395 | md_wakeup_thread(mddev->thread); | |
4396 | // stop recovery, signal do_sync .... | |
4397 | } | |
4398 | } | |
4399 | ||
4400 | ||
06d91a5f N |
4401 | /* md_write_start(mddev, bi) |
4402 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
4403 | * in superblock) before writing, schedule a superblock update |
4404 | * and wait for it to complete. | |
06d91a5f | 4405 | */ |
3d310eb7 | 4406 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 4407 | { |
06d91a5f | 4408 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 4409 | return; |
06d91a5f | 4410 | |
f91de92e N |
4411 | BUG_ON(mddev->ro == 1); |
4412 | if (mddev->ro == 2) { | |
4413 | /* need to switch to read/write */ | |
4414 | mddev->ro = 0; | |
4415 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4416 | md_wakeup_thread(mddev->thread); | |
4417 | } | |
06d91a5f | 4418 | atomic_inc(&mddev->writes_pending); |
06d91a5f | 4419 | if (mddev->in_sync) { |
a9701a30 | 4420 | spin_lock_irq(&mddev->write_lock); |
3d310eb7 N |
4421 | if (mddev->in_sync) { |
4422 | mddev->in_sync = 0; | |
4423 | mddev->sb_dirty = 1; | |
4424 | md_wakeup_thread(mddev->thread); | |
4425 | } | |
a9701a30 | 4426 | spin_unlock_irq(&mddev->write_lock); |
06d91a5f | 4427 | } |
3d310eb7 | 4428 | wait_event(mddev->sb_wait, mddev->sb_dirty==0); |
1da177e4 LT |
4429 | } |
4430 | ||
4431 | void md_write_end(mddev_t *mddev) | |
4432 | { | |
4433 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
4434 | if (mddev->safemode == 2) | |
4435 | md_wakeup_thread(mddev->thread); | |
4436 | else | |
4437 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); | |
4438 | } | |
4439 | } | |
4440 | ||
75c96f85 | 4441 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
4442 | |
4443 | #define SYNC_MARKS 10 | |
4444 | #define SYNC_MARK_STEP (3*HZ) | |
4445 | static void md_do_sync(mddev_t *mddev) | |
4446 | { | |
4447 | mddev_t *mddev2; | |
4448 | unsigned int currspeed = 0, | |
4449 | window; | |
57afd89f | 4450 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
4451 | unsigned long mark[SYNC_MARKS]; |
4452 | sector_t mark_cnt[SYNC_MARKS]; | |
4453 | int last_mark,m; | |
4454 | struct list_head *tmp; | |
4455 | sector_t last_check; | |
57afd89f | 4456 | int skipped = 0; |
1da177e4 LT |
4457 | |
4458 | /* just incase thread restarts... */ | |
4459 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
4460 | return; | |
4461 | ||
4462 | /* we overload curr_resync somewhat here. | |
4463 | * 0 == not engaged in resync at all | |
4464 | * 2 == checking that there is no conflict with another sync | |
4465 | * 1 == like 2, but have yielded to allow conflicting resync to | |
4466 | * commense | |
4467 | * other == active in resync - this many blocks | |
4468 | * | |
4469 | * Before starting a resync we must have set curr_resync to | |
4470 | * 2, and then checked that every "conflicting" array has curr_resync | |
4471 | * less than ours. When we find one that is the same or higher | |
4472 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
4473 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
4474 | * This will mean we have to start checking from the beginning again. | |
4475 | * | |
4476 | */ | |
4477 | ||
4478 | do { | |
4479 | mddev->curr_resync = 2; | |
4480 | ||
4481 | try_again: | |
787453c2 | 4482 | if (kthread_should_stop()) { |
6985c43f | 4483 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
4484 | goto skip; |
4485 | } | |
4486 | ITERATE_MDDEV(mddev2,tmp) { | |
1da177e4 LT |
4487 | if (mddev2 == mddev) |
4488 | continue; | |
4489 | if (mddev2->curr_resync && | |
4490 | match_mddev_units(mddev,mddev2)) { | |
4491 | DEFINE_WAIT(wq); | |
4492 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
4493 | /* arbitrarily yield */ | |
4494 | mddev->curr_resync = 1; | |
4495 | wake_up(&resync_wait); | |
4496 | } | |
4497 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
4498 | /* no need to wait here, we can wait the next | |
4499 | * time 'round when curr_resync == 2 | |
4500 | */ | |
4501 | continue; | |
787453c2 N |
4502 | prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE); |
4503 | if (!kthread_should_stop() && | |
8712e553 | 4504 | mddev2->curr_resync >= mddev->curr_resync) { |
1da177e4 LT |
4505 | printk(KERN_INFO "md: delaying resync of %s" |
4506 | " until %s has finished resync (they" | |
4507 | " share one or more physical units)\n", | |
4508 | mdname(mddev), mdname(mddev2)); | |
4509 | mddev_put(mddev2); | |
4510 | schedule(); | |
4511 | finish_wait(&resync_wait, &wq); | |
4512 | goto try_again; | |
4513 | } | |
4514 | finish_wait(&resync_wait, &wq); | |
4515 | } | |
4516 | } | |
4517 | } while (mddev->curr_resync < 2); | |
4518 | ||
9d88883e | 4519 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 4520 | /* resync follows the size requested by the personality, |
57afd89f | 4521 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
4522 | */ |
4523 | max_sectors = mddev->resync_max_sectors; | |
9d88883e N |
4524 | mddev->resync_mismatches = 0; |
4525 | } else | |
1da177e4 LT |
4526 | /* recovery follows the physical size of devices */ |
4527 | max_sectors = mddev->size << 1; | |
4528 | ||
4529 | printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); | |
4530 | printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" | |
88202a0c | 4531 | " %d KB/sec/disc.\n", speed_min(mddev)); |
338cec32 | 4532 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
1da177e4 | 4533 | "(but not more than %d KB/sec) for reconstruction.\n", |
88202a0c | 4534 | speed_max(mddev)); |
1da177e4 LT |
4535 | |
4536 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
32a7627c | 4537 | /* we don't use the checkpoint if there's a bitmap */ |
24dd469d N |
4538 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap |
4539 | && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1da177e4 LT |
4540 | j = mddev->recovery_cp; |
4541 | else | |
4542 | j = 0; | |
57afd89f | 4543 | io_sectors = 0; |
1da177e4 LT |
4544 | for (m = 0; m < SYNC_MARKS; m++) { |
4545 | mark[m] = jiffies; | |
57afd89f | 4546 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
4547 | } |
4548 | last_mark = 0; | |
4549 | mddev->resync_mark = mark[last_mark]; | |
4550 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
4551 | ||
4552 | /* | |
4553 | * Tune reconstruction: | |
4554 | */ | |
4555 | window = 32*(PAGE_SIZE/512); | |
4556 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
4557 | window/2,(unsigned long long) max_sectors/2); | |
4558 | ||
4559 | atomic_set(&mddev->recovery_active, 0); | |
4560 | init_waitqueue_head(&mddev->recovery_wait); | |
4561 | last_check = 0; | |
4562 | ||
4563 | if (j>2) { | |
4564 | printk(KERN_INFO | |
4565 | "md: resuming recovery of %s from checkpoint.\n", | |
4566 | mdname(mddev)); | |
4567 | mddev->curr_resync = j; | |
4568 | } | |
4569 | ||
4570 | while (j < max_sectors) { | |
57afd89f | 4571 | sector_t sectors; |
1da177e4 | 4572 | |
57afd89f N |
4573 | skipped = 0; |
4574 | sectors = mddev->pers->sync_request(mddev, j, &skipped, | |
88202a0c | 4575 | currspeed < speed_min(mddev)); |
57afd89f | 4576 | if (sectors == 0) { |
1da177e4 LT |
4577 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
4578 | goto out; | |
4579 | } | |
57afd89f N |
4580 | |
4581 | if (!skipped) { /* actual IO requested */ | |
4582 | io_sectors += sectors; | |
4583 | atomic_add(sectors, &mddev->recovery_active); | |
4584 | } | |
4585 | ||
1da177e4 LT |
4586 | j += sectors; |
4587 | if (j>1) mddev->curr_resync = j; | |
d7603b7e N |
4588 | if (last_check == 0) |
4589 | /* this is the earliers that rebuilt will be | |
4590 | * visible in /proc/mdstat | |
4591 | */ | |
4592 | md_new_event(mddev); | |
57afd89f N |
4593 | |
4594 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
4595 | continue; |
4596 | ||
57afd89f | 4597 | last_check = io_sectors; |
1da177e4 LT |
4598 | |
4599 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
4600 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
4601 | break; | |
4602 | ||
4603 | repeat: | |
4604 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
4605 | /* step marks */ | |
4606 | int next = (last_mark+1) % SYNC_MARKS; | |
4607 | ||
4608 | mddev->resync_mark = mark[next]; | |
4609 | mddev->resync_mark_cnt = mark_cnt[next]; | |
4610 | mark[next] = jiffies; | |
57afd89f | 4611 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
4612 | last_mark = next; |
4613 | } | |
4614 | ||
4615 | ||
787453c2 | 4616 | if (kthread_should_stop()) { |
1da177e4 LT |
4617 | /* |
4618 | * got a signal, exit. | |
4619 | */ | |
4620 | printk(KERN_INFO | |
4621 | "md: md_do_sync() got signal ... exiting\n"); | |
1da177e4 LT |
4622 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
4623 | goto out; | |
4624 | } | |
4625 | ||
4626 | /* | |
4627 | * this loop exits only if either when we are slower than | |
4628 | * the 'hard' speed limit, or the system was IO-idle for | |
4629 | * a jiffy. | |
4630 | * the system might be non-idle CPU-wise, but we only care | |
4631 | * about not overloading the IO subsystem. (things like an | |
4632 | * e2fsck being done on the RAID array should execute fast) | |
4633 | */ | |
4634 | mddev->queue->unplug_fn(mddev->queue); | |
4635 | cond_resched(); | |
4636 | ||
57afd89f N |
4637 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
4638 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 | 4639 | |
88202a0c N |
4640 | if (currspeed > speed_min(mddev)) { |
4641 | if ((currspeed > speed_max(mddev)) || | |
1da177e4 | 4642 | !is_mddev_idle(mddev)) { |
c0e48521 | 4643 | msleep(500); |
1da177e4 LT |
4644 | goto repeat; |
4645 | } | |
4646 | } | |
4647 | } | |
4648 | printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); | |
4649 | /* | |
4650 | * this also signals 'finished resyncing' to md_stop | |
4651 | */ | |
4652 | out: | |
4653 | mddev->queue->unplug_fn(mddev->queue); | |
4654 | ||
4655 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
4656 | ||
4657 | /* tell personality that we are finished */ | |
57afd89f | 4658 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
4659 | |
4660 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4661 | mddev->curr_resync > 2 && | |
4662 | mddev->curr_resync >= mddev->recovery_cp) { | |
4663 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4664 | printk(KERN_INFO | |
4665 | "md: checkpointing recovery of %s.\n", | |
4666 | mdname(mddev)); | |
4667 | mddev->recovery_cp = mddev->curr_resync; | |
4668 | } else | |
4669 | mddev->recovery_cp = MaxSector; | |
4670 | } | |
4671 | ||
1da177e4 LT |
4672 | skip: |
4673 | mddev->curr_resync = 0; | |
4674 | wake_up(&resync_wait); | |
4675 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
4676 | md_wakeup_thread(mddev->thread); | |
4677 | } | |
4678 | ||
4679 | ||
4680 | /* | |
4681 | * This routine is regularly called by all per-raid-array threads to | |
4682 | * deal with generic issues like resync and super-block update. | |
4683 | * Raid personalities that don't have a thread (linear/raid0) do not | |
4684 | * need this as they never do any recovery or update the superblock. | |
4685 | * | |
4686 | * It does not do any resync itself, but rather "forks" off other threads | |
4687 | * to do that as needed. | |
4688 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
4689 | * "->recovery" and create a thread at ->sync_thread. | |
4690 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
4691 | * and wakeups up this thread which will reap the thread and finish up. | |
4692 | * This thread also removes any faulty devices (with nr_pending == 0). | |
4693 | * | |
4694 | * The overall approach is: | |
4695 | * 1/ if the superblock needs updating, update it. | |
4696 | * 2/ If a recovery thread is running, don't do anything else. | |
4697 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
4698 | * 4/ If there are any faulty devices, remove them. | |
4699 | * 5/ If array is degraded, try to add spares devices | |
4700 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
4701 | */ | |
4702 | void md_check_recovery(mddev_t *mddev) | |
4703 | { | |
4704 | mdk_rdev_t *rdev; | |
4705 | struct list_head *rtmp; | |
4706 | ||
4707 | ||
5f40402d N |
4708 | if (mddev->bitmap) |
4709 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
4710 | |
4711 | if (mddev->ro) | |
4712 | return; | |
fca4d848 N |
4713 | |
4714 | if (signal_pending(current)) { | |
4715 | if (mddev->pers->sync_request) { | |
4716 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
4717 | mdname(mddev)); | |
4718 | mddev->safemode = 2; | |
4719 | } | |
4720 | flush_signals(current); | |
4721 | } | |
4722 | ||
1da177e4 LT |
4723 | if ( ! ( |
4724 | mddev->sb_dirty || | |
4725 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || | |
fca4d848 N |
4726 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
4727 | (mddev->safemode == 1) || | |
4728 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
4729 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
4730 | )) |
4731 | return; | |
fca4d848 | 4732 | |
1da177e4 LT |
4733 | if (mddev_trylock(mddev)==0) { |
4734 | int spares =0; | |
fca4d848 | 4735 | |
a9701a30 | 4736 | spin_lock_irq(&mddev->write_lock); |
fca4d848 N |
4737 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
4738 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
4739 | mddev->in_sync = 1; | |
4740 | mddev->sb_dirty = 1; | |
4741 | } | |
4742 | if (mddev->safemode == 1) | |
4743 | mddev->safemode = 0; | |
a9701a30 | 4744 | spin_unlock_irq(&mddev->write_lock); |
fca4d848 | 4745 | |
1da177e4 LT |
4746 | if (mddev->sb_dirty) |
4747 | md_update_sb(mddev); | |
06d91a5f | 4748 | |
06d91a5f | 4749 | |
1da177e4 LT |
4750 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4751 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
4752 | /* resync/recovery still happening */ | |
4753 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4754 | goto unlock; | |
4755 | } | |
4756 | if (mddev->sync_thread) { | |
4757 | /* resync has finished, collect result */ | |
4758 | md_unregister_thread(mddev->sync_thread); | |
4759 | mddev->sync_thread = NULL; | |
4760 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4761 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4762 | /* success...*/ | |
4763 | /* activate any spares */ | |
4764 | mddev->pers->spare_active(mddev); | |
4765 | } | |
4766 | md_update_sb(mddev); | |
41158c7e N |
4767 | |
4768 | /* if array is no-longer degraded, then any saved_raid_disk | |
4769 | * information must be scrapped | |
4770 | */ | |
4771 | if (!mddev->degraded) | |
4772 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4773 | rdev->saved_raid_disk = -1; | |
4774 | ||
1da177e4 LT |
4775 | mddev->recovery = 0; |
4776 | /* flag recovery needed just to double check */ | |
4777 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
d7603b7e | 4778 | md_new_event(mddev); |
1da177e4 LT |
4779 | goto unlock; |
4780 | } | |
24dd469d N |
4781 | /* Clear some bits that don't mean anything, but |
4782 | * might be left set | |
4783 | */ | |
4784 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4785 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
4786 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4787 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 LT |
4788 | |
4789 | /* no recovery is running. | |
4790 | * remove any failed drives, then | |
4791 | * add spares if possible. | |
4792 | * Spare are also removed and re-added, to allow | |
4793 | * the personality to fail the re-add. | |
4794 | */ | |
4795 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4796 | if (rdev->raid_disk >= 0 && | |
b2d444d7 | 4797 | (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && |
1da177e4 | 4798 | atomic_read(&rdev->nr_pending)==0) { |
86e6ffdd N |
4799 | if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { |
4800 | char nm[20]; | |
4801 | sprintf(nm,"rd%d", rdev->raid_disk); | |
4802 | sysfs_remove_link(&mddev->kobj, nm); | |
1da177e4 | 4803 | rdev->raid_disk = -1; |
86e6ffdd | 4804 | } |
1da177e4 LT |
4805 | } |
4806 | ||
4807 | if (mddev->degraded) { | |
4808 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4809 | if (rdev->raid_disk < 0 | |
b2d444d7 | 4810 | && !test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
4811 | if (mddev->pers->hot_add_disk(mddev,rdev)) { |
4812 | char nm[20]; | |
4813 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4814 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
1da177e4 | 4815 | spares++; |
d7603b7e | 4816 | md_new_event(mddev); |
86e6ffdd | 4817 | } else |
1da177e4 LT |
4818 | break; |
4819 | } | |
4820 | } | |
4821 | ||
24dd469d N |
4822 | if (spares) { |
4823 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4824 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4825 | } else if (mddev->recovery_cp < MaxSector) { | |
4826 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4827 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4828 | /* nothing to be done ... */ | |
1da177e4 | 4829 | goto unlock; |
24dd469d | 4830 | |
1da177e4 LT |
4831 | if (mddev->pers->sync_request) { |
4832 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
4833 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
4834 | /* We are adding a device or devices to an array | |
4835 | * which has the bitmap stored on all devices. | |
4836 | * So make sure all bitmap pages get written | |
4837 | */ | |
4838 | bitmap_write_all(mddev->bitmap); | |
4839 | } | |
1da177e4 LT |
4840 | mddev->sync_thread = md_register_thread(md_do_sync, |
4841 | mddev, | |
4842 | "%s_resync"); | |
4843 | if (!mddev->sync_thread) { | |
4844 | printk(KERN_ERR "%s: could not start resync" | |
4845 | " thread...\n", | |
4846 | mdname(mddev)); | |
4847 | /* leave the spares where they are, it shouldn't hurt */ | |
4848 | mddev->recovery = 0; | |
d7603b7e | 4849 | } else |
1da177e4 | 4850 | md_wakeup_thread(mddev->sync_thread); |
d7603b7e | 4851 | md_new_event(mddev); |
1da177e4 LT |
4852 | } |
4853 | unlock: | |
4854 | mddev_unlock(mddev); | |
4855 | } | |
4856 | } | |
4857 | ||
75c96f85 AB |
4858 | static int md_notify_reboot(struct notifier_block *this, |
4859 | unsigned long code, void *x) | |
1da177e4 LT |
4860 | { |
4861 | struct list_head *tmp; | |
4862 | mddev_t *mddev; | |
4863 | ||
4864 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
4865 | ||
4866 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
4867 | ||
4868 | ITERATE_MDDEV(mddev,tmp) | |
4869 | if (mddev_trylock(mddev)==0) | |
4870 | do_md_stop (mddev, 1); | |
4871 | /* | |
4872 | * certain more exotic SCSI devices are known to be | |
4873 | * volatile wrt too early system reboots. While the | |
4874 | * right place to handle this issue is the given | |
4875 | * driver, we do want to have a safe RAID driver ... | |
4876 | */ | |
4877 | mdelay(1000*1); | |
4878 | } | |
4879 | return NOTIFY_DONE; | |
4880 | } | |
4881 | ||
75c96f85 | 4882 | static struct notifier_block md_notifier = { |
1da177e4 LT |
4883 | .notifier_call = md_notify_reboot, |
4884 | .next = NULL, | |
4885 | .priority = INT_MAX, /* before any real devices */ | |
4886 | }; | |
4887 | ||
4888 | static void md_geninit(void) | |
4889 | { | |
4890 | struct proc_dir_entry *p; | |
4891 | ||
4892 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
4893 | ||
4894 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
4895 | if (p) | |
4896 | p->proc_fops = &md_seq_fops; | |
4897 | } | |
4898 | ||
75c96f85 | 4899 | static int __init md_init(void) |
1da177e4 LT |
4900 | { |
4901 | int minor; | |
4902 | ||
4903 | printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," | |
4904 | " MD_SB_DISKS=%d\n", | |
4905 | MD_MAJOR_VERSION, MD_MINOR_VERSION, | |
4906 | MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); | |
bd926c63 | 4907 | printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI, |
32a7627c | 4908 | BITMAP_MINOR); |
1da177e4 LT |
4909 | |
4910 | if (register_blkdev(MAJOR_NR, "md")) | |
4911 | return -1; | |
4912 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
4913 | unregister_blkdev(MAJOR_NR, "md"); | |
4914 | return -1; | |
4915 | } | |
4916 | devfs_mk_dir("md"); | |
4917 | blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, | |
4918 | md_probe, NULL, NULL); | |
4919 | blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, | |
4920 | md_probe, NULL, NULL); | |
4921 | ||
4922 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4923 | devfs_mk_bdev(MKDEV(MAJOR_NR, minor), | |
4924 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4925 | "md/%d", minor); | |
4926 | ||
4927 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4928 | devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), | |
4929 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4930 | "md/mdp%d", minor); | |
4931 | ||
4932 | ||
4933 | register_reboot_notifier(&md_notifier); | |
4934 | raid_table_header = register_sysctl_table(raid_root_table, 1); | |
4935 | ||
4936 | md_geninit(); | |
4937 | return (0); | |
4938 | } | |
4939 | ||
4940 | ||
4941 | #ifndef MODULE | |
4942 | ||
4943 | /* | |
4944 | * Searches all registered partitions for autorun RAID arrays | |
4945 | * at boot time. | |
4946 | */ | |
4947 | static dev_t detected_devices[128]; | |
4948 | static int dev_cnt; | |
4949 | ||
4950 | void md_autodetect_dev(dev_t dev) | |
4951 | { | |
4952 | if (dev_cnt >= 0 && dev_cnt < 127) | |
4953 | detected_devices[dev_cnt++] = dev; | |
4954 | } | |
4955 | ||
4956 | ||
4957 | static void autostart_arrays(int part) | |
4958 | { | |
4959 | mdk_rdev_t *rdev; | |
4960 | int i; | |
4961 | ||
4962 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); | |
4963 | ||
4964 | for (i = 0; i < dev_cnt; i++) { | |
4965 | dev_t dev = detected_devices[i]; | |
4966 | ||
4967 | rdev = md_import_device(dev,0, 0); | |
4968 | if (IS_ERR(rdev)) | |
4969 | continue; | |
4970 | ||
b2d444d7 | 4971 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4972 | MD_BUG(); |
4973 | continue; | |
4974 | } | |
4975 | list_add(&rdev->same_set, &pending_raid_disks); | |
4976 | } | |
4977 | dev_cnt = 0; | |
4978 | ||
4979 | autorun_devices(part); | |
4980 | } | |
4981 | ||
4982 | #endif | |
4983 | ||
4984 | static __exit void md_exit(void) | |
4985 | { | |
4986 | mddev_t *mddev; | |
4987 | struct list_head *tmp; | |
4988 | int i; | |
4989 | blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); | |
4990 | blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); | |
4991 | for (i=0; i < MAX_MD_DEVS; i++) | |
4992 | devfs_remove("md/%d", i); | |
4993 | for (i=0; i < MAX_MD_DEVS; i++) | |
4994 | devfs_remove("md/d%d", i); | |
4995 | ||
4996 | devfs_remove("md"); | |
4997 | ||
4998 | unregister_blkdev(MAJOR_NR,"md"); | |
4999 | unregister_blkdev(mdp_major, "mdp"); | |
5000 | unregister_reboot_notifier(&md_notifier); | |
5001 | unregister_sysctl_table(raid_table_header); | |
5002 | remove_proc_entry("mdstat", NULL); | |
5003 | ITERATE_MDDEV(mddev,tmp) { | |
5004 | struct gendisk *disk = mddev->gendisk; | |
5005 | if (!disk) | |
5006 | continue; | |
5007 | export_array(mddev); | |
5008 | del_gendisk(disk); | |
5009 | put_disk(disk); | |
5010 | mddev->gendisk = NULL; | |
5011 | mddev_put(mddev); | |
5012 | } | |
5013 | } | |
5014 | ||
5015 | module_init(md_init) | |
5016 | module_exit(md_exit) | |
5017 | ||
f91de92e N |
5018 | static int get_ro(char *buffer, struct kernel_param *kp) |
5019 | { | |
5020 | return sprintf(buffer, "%d", start_readonly); | |
5021 | } | |
5022 | static int set_ro(const char *val, struct kernel_param *kp) | |
5023 | { | |
5024 | char *e; | |
5025 | int num = simple_strtoul(val, &e, 10); | |
5026 | if (*val && (*e == '\0' || *e == '\n')) { | |
5027 | start_readonly = num; | |
4dbcdc75 | 5028 | return 0; |
f91de92e N |
5029 | } |
5030 | return -EINVAL; | |
5031 | } | |
5032 | ||
5033 | module_param_call(start_ro, set_ro, get_ro, NULL, 0600); | |
6ff8d8ec N |
5034 | module_param(start_dirty_degraded, int, 0644); |
5035 | ||
f91de92e | 5036 | |
1da177e4 LT |
5037 | EXPORT_SYMBOL(register_md_personality); |
5038 | EXPORT_SYMBOL(unregister_md_personality); | |
5039 | EXPORT_SYMBOL(md_error); | |
5040 | EXPORT_SYMBOL(md_done_sync); | |
5041 | EXPORT_SYMBOL(md_write_start); | |
5042 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
5043 | EXPORT_SYMBOL(md_register_thread); |
5044 | EXPORT_SYMBOL(md_unregister_thread); | |
5045 | EXPORT_SYMBOL(md_wakeup_thread); | |
5046 | EXPORT_SYMBOL(md_print_devices); | |
5047 | EXPORT_SYMBOL(md_check_recovery); | |
5048 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 5049 | MODULE_ALIAS("md"); |
72008652 | 5050 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |