Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | md.c : Multiple Devices driver for Linux | |
3 | Copyright (C) 1998, 1999, 2000 Ingo Molnar | |
4 | ||
5 | completely rewritten, based on the MD driver code from Marc Zyngier | |
6 | ||
7 | Changes: | |
8 | ||
9 | - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar | |
10 | - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com> | |
11 | - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net> | |
12 | - kerneld support by Boris Tobotras <boris@xtalk.msk.su> | |
13 | - kmod support by: Cyrus Durgin | |
14 | - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com> | |
15 | - Devfs support by Richard Gooch <rgooch@atnf.csiro.au> | |
16 | ||
17 | - lots of fixes and improvements to the RAID1/RAID5 and generic | |
18 | RAID code (such as request based resynchronization): | |
19 | ||
20 | Neil Brown <neilb@cse.unsw.edu.au>. | |
21 | ||
32a7627c N |
22 | - persistent bitmap code |
23 | Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc. | |
24 | ||
1da177e4 LT |
25 | This program is free software; you can redistribute it and/or modify |
26 | it under the terms of the GNU General Public License as published by | |
27 | the Free Software Foundation; either version 2, or (at your option) | |
28 | any later version. | |
29 | ||
30 | You should have received a copy of the GNU General Public License | |
31 | (for example /usr/src/linux/COPYING); if not, write to the Free | |
32 | Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. | |
33 | */ | |
34 | ||
35 | #include <linux/module.h> | |
36 | #include <linux/config.h> | |
a6fb0934 | 37 | #include <linux/kthread.h> |
1da177e4 LT |
38 | #include <linux/linkage.h> |
39 | #include <linux/raid/md.h> | |
32a7627c | 40 | #include <linux/raid/bitmap.h> |
1da177e4 LT |
41 | #include <linux/sysctl.h> |
42 | #include <linux/devfs_fs_kernel.h> | |
43 | #include <linux/buffer_head.h> /* for invalidate_bdev */ | |
44 | #include <linux/suspend.h> | |
45 | ||
46 | #include <linux/init.h> | |
47 | ||
32a7627c N |
48 | #include <linux/file.h> |
49 | ||
1da177e4 LT |
50 | #ifdef CONFIG_KMOD |
51 | #include <linux/kmod.h> | |
52 | #endif | |
53 | ||
54 | #include <asm/unaligned.h> | |
55 | ||
56 | #define MAJOR_NR MD_MAJOR | |
57 | #define MD_DRIVER | |
58 | ||
59 | /* 63 partitions with the alternate major number (mdp) */ | |
60 | #define MdpMinorShift 6 | |
61 | ||
62 | #define DEBUG 0 | |
63 | #define dprintk(x...) ((void)(DEBUG && printk(x))) | |
64 | ||
65 | ||
66 | #ifndef MODULE | |
67 | static void autostart_arrays (int part); | |
68 | #endif | |
69 | ||
70 | static mdk_personality_t *pers[MAX_PERSONALITY]; | |
71 | static DEFINE_SPINLOCK(pers_lock); | |
72 | ||
73 | /* | |
74 | * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit' | |
75 | * is 1000 KB/sec, so the extra system load does not show up that much. | |
76 | * Increase it if you want to have more _guaranteed_ speed. Note that | |
338cec32 | 77 | * the RAID driver will use the maximum available bandwidth if the IO |
1da177e4 LT |
78 | * subsystem is idle. There is also an 'absolute maximum' reconstruction |
79 | * speed limit - in case reconstruction slows down your system despite | |
80 | * idle IO detection. | |
81 | * | |
82 | * you can change it via /proc/sys/dev/raid/speed_limit_min and _max. | |
83 | */ | |
84 | ||
85 | static int sysctl_speed_limit_min = 1000; | |
86 | static int sysctl_speed_limit_max = 200000; | |
87 | ||
88 | static struct ctl_table_header *raid_table_header; | |
89 | ||
90 | static ctl_table raid_table[] = { | |
91 | { | |
92 | .ctl_name = DEV_RAID_SPEED_LIMIT_MIN, | |
93 | .procname = "speed_limit_min", | |
94 | .data = &sysctl_speed_limit_min, | |
95 | .maxlen = sizeof(int), | |
96 | .mode = 0644, | |
97 | .proc_handler = &proc_dointvec, | |
98 | }, | |
99 | { | |
100 | .ctl_name = DEV_RAID_SPEED_LIMIT_MAX, | |
101 | .procname = "speed_limit_max", | |
102 | .data = &sysctl_speed_limit_max, | |
103 | .maxlen = sizeof(int), | |
104 | .mode = 0644, | |
105 | .proc_handler = &proc_dointvec, | |
106 | }, | |
107 | { .ctl_name = 0 } | |
108 | }; | |
109 | ||
110 | static ctl_table raid_dir_table[] = { | |
111 | { | |
112 | .ctl_name = DEV_RAID, | |
113 | .procname = "raid", | |
114 | .maxlen = 0, | |
115 | .mode = 0555, | |
116 | .child = raid_table, | |
117 | }, | |
118 | { .ctl_name = 0 } | |
119 | }; | |
120 | ||
121 | static ctl_table raid_root_table[] = { | |
122 | { | |
123 | .ctl_name = CTL_DEV, | |
124 | .procname = "dev", | |
125 | .maxlen = 0, | |
126 | .mode = 0555, | |
127 | .child = raid_dir_table, | |
128 | }, | |
129 | { .ctl_name = 0 } | |
130 | }; | |
131 | ||
132 | static struct block_device_operations md_fops; | |
133 | ||
134 | /* | |
135 | * Enables to iterate over all existing md arrays | |
136 | * all_mddevs_lock protects this list. | |
137 | */ | |
138 | static LIST_HEAD(all_mddevs); | |
139 | static DEFINE_SPINLOCK(all_mddevs_lock); | |
140 | ||
141 | ||
142 | /* | |
143 | * iterates through all used mddevs in the system. | |
144 | * We take care to grab the all_mddevs_lock whenever navigating | |
145 | * the list, and to always hold a refcount when unlocked. | |
146 | * Any code which breaks out of this loop while own | |
147 | * a reference to the current mddev and must mddev_put it. | |
148 | */ | |
149 | #define ITERATE_MDDEV(mddev,tmp) \ | |
150 | \ | |
151 | for (({ spin_lock(&all_mddevs_lock); \ | |
152 | tmp = all_mddevs.next; \ | |
153 | mddev = NULL;}); \ | |
154 | ({ if (tmp != &all_mddevs) \ | |
155 | mddev_get(list_entry(tmp, mddev_t, all_mddevs));\ | |
156 | spin_unlock(&all_mddevs_lock); \ | |
157 | if (mddev) mddev_put(mddev); \ | |
158 | mddev = list_entry(tmp, mddev_t, all_mddevs); \ | |
159 | tmp != &all_mddevs;}); \ | |
160 | ({ spin_lock(&all_mddevs_lock); \ | |
161 | tmp = tmp->next;}) \ | |
162 | ) | |
163 | ||
164 | ||
165 | static int md_fail_request (request_queue_t *q, struct bio *bio) | |
166 | { | |
167 | bio_io_error(bio, bio->bi_size); | |
168 | return 0; | |
169 | } | |
170 | ||
171 | static inline mddev_t *mddev_get(mddev_t *mddev) | |
172 | { | |
173 | atomic_inc(&mddev->active); | |
174 | return mddev; | |
175 | } | |
176 | ||
177 | static void mddev_put(mddev_t *mddev) | |
178 | { | |
179 | if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock)) | |
180 | return; | |
181 | if (!mddev->raid_disks && list_empty(&mddev->disks)) { | |
182 | list_del(&mddev->all_mddevs); | |
183 | blk_put_queue(mddev->queue); | |
eae1701f | 184 | kobject_unregister(&mddev->kobj); |
1da177e4 LT |
185 | } |
186 | spin_unlock(&all_mddevs_lock); | |
187 | } | |
188 | ||
189 | static mddev_t * mddev_find(dev_t unit) | |
190 | { | |
191 | mddev_t *mddev, *new = NULL; | |
192 | ||
193 | retry: | |
194 | spin_lock(&all_mddevs_lock); | |
195 | list_for_each_entry(mddev, &all_mddevs, all_mddevs) | |
196 | if (mddev->unit == unit) { | |
197 | mddev_get(mddev); | |
198 | spin_unlock(&all_mddevs_lock); | |
990a8baf | 199 | kfree(new); |
1da177e4 LT |
200 | return mddev; |
201 | } | |
202 | ||
203 | if (new) { | |
204 | list_add(&new->all_mddevs, &all_mddevs); | |
205 | spin_unlock(&all_mddevs_lock); | |
206 | return new; | |
207 | } | |
208 | spin_unlock(&all_mddevs_lock); | |
209 | ||
210 | new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL); | |
211 | if (!new) | |
212 | return NULL; | |
213 | ||
214 | memset(new, 0, sizeof(*new)); | |
215 | ||
216 | new->unit = unit; | |
217 | if (MAJOR(unit) == MD_MAJOR) | |
218 | new->md_minor = MINOR(unit); | |
219 | else | |
220 | new->md_minor = MINOR(unit) >> MdpMinorShift; | |
221 | ||
222 | init_MUTEX(&new->reconfig_sem); | |
223 | INIT_LIST_HEAD(&new->disks); | |
224 | INIT_LIST_HEAD(&new->all_mddevs); | |
225 | init_timer(&new->safemode_timer); | |
226 | atomic_set(&new->active, 1); | |
06d91a5f | 227 | spin_lock_init(&new->write_lock); |
3d310eb7 | 228 | init_waitqueue_head(&new->sb_wait); |
1da177e4 LT |
229 | |
230 | new->queue = blk_alloc_queue(GFP_KERNEL); | |
231 | if (!new->queue) { | |
232 | kfree(new); | |
233 | return NULL; | |
234 | } | |
235 | ||
236 | blk_queue_make_request(new->queue, md_fail_request); | |
237 | ||
238 | goto retry; | |
239 | } | |
240 | ||
241 | static inline int mddev_lock(mddev_t * mddev) | |
242 | { | |
243 | return down_interruptible(&mddev->reconfig_sem); | |
244 | } | |
245 | ||
246 | static inline void mddev_lock_uninterruptible(mddev_t * mddev) | |
247 | { | |
248 | down(&mddev->reconfig_sem); | |
249 | } | |
250 | ||
251 | static inline int mddev_trylock(mddev_t * mddev) | |
252 | { | |
253 | return down_trylock(&mddev->reconfig_sem); | |
254 | } | |
255 | ||
256 | static inline void mddev_unlock(mddev_t * mddev) | |
257 | { | |
258 | up(&mddev->reconfig_sem); | |
259 | ||
005eca5e | 260 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
261 | } |
262 | ||
263 | mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr) | |
264 | { | |
265 | mdk_rdev_t * rdev; | |
266 | struct list_head *tmp; | |
267 | ||
268 | ITERATE_RDEV(mddev,rdev,tmp) { | |
269 | if (rdev->desc_nr == nr) | |
270 | return rdev; | |
271 | } | |
272 | return NULL; | |
273 | } | |
274 | ||
275 | static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev) | |
276 | { | |
277 | struct list_head *tmp; | |
278 | mdk_rdev_t *rdev; | |
279 | ||
280 | ITERATE_RDEV(mddev,rdev,tmp) { | |
281 | if (rdev->bdev->bd_dev == dev) | |
282 | return rdev; | |
283 | } | |
284 | return NULL; | |
285 | } | |
286 | ||
77933d72 | 287 | static inline sector_t calc_dev_sboffset(struct block_device *bdev) |
1da177e4 LT |
288 | { |
289 | sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
290 | return MD_NEW_SIZE_BLOCKS(size); | |
291 | } | |
292 | ||
293 | static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size) | |
294 | { | |
295 | sector_t size; | |
296 | ||
297 | size = rdev->sb_offset; | |
298 | ||
299 | if (chunk_size) | |
300 | size &= ~((sector_t)chunk_size/1024 - 1); | |
301 | return size; | |
302 | } | |
303 | ||
304 | static int alloc_disk_sb(mdk_rdev_t * rdev) | |
305 | { | |
306 | if (rdev->sb_page) | |
307 | MD_BUG(); | |
308 | ||
309 | rdev->sb_page = alloc_page(GFP_KERNEL); | |
310 | if (!rdev->sb_page) { | |
311 | printk(KERN_ALERT "md: out of memory.\n"); | |
312 | return -EINVAL; | |
313 | } | |
314 | ||
315 | return 0; | |
316 | } | |
317 | ||
318 | static void free_disk_sb(mdk_rdev_t * rdev) | |
319 | { | |
320 | if (rdev->sb_page) { | |
321 | page_cache_release(rdev->sb_page); | |
322 | rdev->sb_loaded = 0; | |
323 | rdev->sb_page = NULL; | |
324 | rdev->sb_offset = 0; | |
325 | rdev->size = 0; | |
326 | } | |
327 | } | |
328 | ||
329 | ||
7bfa19f2 N |
330 | static int super_written(struct bio *bio, unsigned int bytes_done, int error) |
331 | { | |
332 | mdk_rdev_t *rdev = bio->bi_private; | |
333 | if (bio->bi_size) | |
334 | return 1; | |
335 | ||
336 | if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) | |
337 | md_error(rdev->mddev, rdev); | |
338 | ||
339 | if (atomic_dec_and_test(&rdev->mddev->pending_writes)) | |
340 | wake_up(&rdev->mddev->sb_wait); | |
f8b58edf | 341 | bio_put(bio); |
7bfa19f2 N |
342 | return 0; |
343 | } | |
344 | ||
345 | void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev, | |
346 | sector_t sector, int size, struct page *page) | |
347 | { | |
348 | /* write first size bytes of page to sector of rdev | |
349 | * Increment mddev->pending_writes before returning | |
350 | * and decrement it on completion, waking up sb_wait | |
351 | * if zero is reached. | |
352 | * If an error occurred, call md_error | |
353 | */ | |
354 | struct bio *bio = bio_alloc(GFP_NOIO, 1); | |
355 | ||
356 | bio->bi_bdev = rdev->bdev; | |
357 | bio->bi_sector = sector; | |
358 | bio_add_page(bio, page, size, 0); | |
359 | bio->bi_private = rdev; | |
360 | bio->bi_end_io = super_written; | |
361 | atomic_inc(&mddev->pending_writes); | |
362 | submit_bio((1<<BIO_RW)|(1<<BIO_RW_SYNC), bio); | |
363 | } | |
364 | ||
1da177e4 LT |
365 | static int bi_complete(struct bio *bio, unsigned int bytes_done, int error) |
366 | { | |
367 | if (bio->bi_size) | |
368 | return 1; | |
369 | ||
370 | complete((struct completion*)bio->bi_private); | |
371 | return 0; | |
372 | } | |
373 | ||
a654b9d8 | 374 | int sync_page_io(struct block_device *bdev, sector_t sector, int size, |
1da177e4 LT |
375 | struct page *page, int rw) |
376 | { | |
baaa2c51 | 377 | struct bio *bio = bio_alloc(GFP_NOIO, 1); |
1da177e4 LT |
378 | struct completion event; |
379 | int ret; | |
380 | ||
381 | rw |= (1 << BIO_RW_SYNC); | |
382 | ||
383 | bio->bi_bdev = bdev; | |
384 | bio->bi_sector = sector; | |
385 | bio_add_page(bio, page, size, 0); | |
386 | init_completion(&event); | |
387 | bio->bi_private = &event; | |
388 | bio->bi_end_io = bi_complete; | |
389 | submit_bio(rw, bio); | |
390 | wait_for_completion(&event); | |
391 | ||
392 | ret = test_bit(BIO_UPTODATE, &bio->bi_flags); | |
393 | bio_put(bio); | |
394 | return ret; | |
395 | } | |
396 | ||
0002b271 | 397 | static int read_disk_sb(mdk_rdev_t * rdev, int size) |
1da177e4 LT |
398 | { |
399 | char b[BDEVNAME_SIZE]; | |
400 | if (!rdev->sb_page) { | |
401 | MD_BUG(); | |
402 | return -EINVAL; | |
403 | } | |
404 | if (rdev->sb_loaded) | |
405 | return 0; | |
406 | ||
407 | ||
0002b271 | 408 | if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ)) |
1da177e4 LT |
409 | goto fail; |
410 | rdev->sb_loaded = 1; | |
411 | return 0; | |
412 | ||
413 | fail: | |
414 | printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n", | |
415 | bdevname(rdev->bdev,b)); | |
416 | return -EINVAL; | |
417 | } | |
418 | ||
419 | static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
420 | { | |
421 | if ( (sb1->set_uuid0 == sb2->set_uuid0) && | |
422 | (sb1->set_uuid1 == sb2->set_uuid1) && | |
423 | (sb1->set_uuid2 == sb2->set_uuid2) && | |
424 | (sb1->set_uuid3 == sb2->set_uuid3)) | |
425 | ||
426 | return 1; | |
427 | ||
428 | return 0; | |
429 | } | |
430 | ||
431 | ||
432 | static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2) | |
433 | { | |
434 | int ret; | |
435 | mdp_super_t *tmp1, *tmp2; | |
436 | ||
437 | tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL); | |
438 | tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL); | |
439 | ||
440 | if (!tmp1 || !tmp2) { | |
441 | ret = 0; | |
442 | printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n"); | |
443 | goto abort; | |
444 | } | |
445 | ||
446 | *tmp1 = *sb1; | |
447 | *tmp2 = *sb2; | |
448 | ||
449 | /* | |
450 | * nr_disks is not constant | |
451 | */ | |
452 | tmp1->nr_disks = 0; | |
453 | tmp2->nr_disks = 0; | |
454 | ||
455 | if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4)) | |
456 | ret = 0; | |
457 | else | |
458 | ret = 1; | |
459 | ||
460 | abort: | |
990a8baf JJ |
461 | kfree(tmp1); |
462 | kfree(tmp2); | |
1da177e4 LT |
463 | return ret; |
464 | } | |
465 | ||
466 | static unsigned int calc_sb_csum(mdp_super_t * sb) | |
467 | { | |
468 | unsigned int disk_csum, csum; | |
469 | ||
470 | disk_csum = sb->sb_csum; | |
471 | sb->sb_csum = 0; | |
472 | csum = csum_partial((void *)sb, MD_SB_BYTES, 0); | |
473 | sb->sb_csum = disk_csum; | |
474 | return csum; | |
475 | } | |
476 | ||
477 | ||
478 | /* | |
479 | * Handle superblock details. | |
480 | * We want to be able to handle multiple superblock formats | |
481 | * so we have a common interface to them all, and an array of | |
482 | * different handlers. | |
483 | * We rely on user-space to write the initial superblock, and support | |
484 | * reading and updating of superblocks. | |
485 | * Interface methods are: | |
486 | * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version) | |
487 | * loads and validates a superblock on dev. | |
488 | * if refdev != NULL, compare superblocks on both devices | |
489 | * Return: | |
490 | * 0 - dev has a superblock that is compatible with refdev | |
491 | * 1 - dev has a superblock that is compatible and newer than refdev | |
492 | * so dev should be used as the refdev in future | |
493 | * -EINVAL superblock incompatible or invalid | |
494 | * -othererror e.g. -EIO | |
495 | * | |
496 | * int validate_super(mddev_t *mddev, mdk_rdev_t *dev) | |
497 | * Verify that dev is acceptable into mddev. | |
498 | * The first time, mddev->raid_disks will be 0, and data from | |
499 | * dev should be merged in. Subsequent calls check that dev | |
500 | * is new enough. Return 0 or -EINVAL | |
501 | * | |
502 | * void sync_super(mddev_t *mddev, mdk_rdev_t *dev) | |
503 | * Update the superblock for rdev with data in mddev | |
504 | * This does not write to disc. | |
505 | * | |
506 | */ | |
507 | ||
508 | struct super_type { | |
509 | char *name; | |
510 | struct module *owner; | |
511 | int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version); | |
512 | int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
513 | void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev); | |
514 | }; | |
515 | ||
516 | /* | |
517 | * load_super for 0.90.0 | |
518 | */ | |
519 | static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
520 | { | |
521 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
522 | mdp_super_t *sb; | |
523 | int ret; | |
524 | sector_t sb_offset; | |
525 | ||
526 | /* | |
527 | * Calculate the position of the superblock, | |
528 | * it's at the end of the disk. | |
529 | * | |
530 | * It also happens to be a multiple of 4Kb. | |
531 | */ | |
532 | sb_offset = calc_dev_sboffset(rdev->bdev); | |
533 | rdev->sb_offset = sb_offset; | |
534 | ||
0002b271 | 535 | ret = read_disk_sb(rdev, MD_SB_BYTES); |
1da177e4 LT |
536 | if (ret) return ret; |
537 | ||
538 | ret = -EINVAL; | |
539 | ||
540 | bdevname(rdev->bdev, b); | |
541 | sb = (mdp_super_t*)page_address(rdev->sb_page); | |
542 | ||
543 | if (sb->md_magic != MD_SB_MAGIC) { | |
544 | printk(KERN_ERR "md: invalid raid superblock magic on %s\n", | |
545 | b); | |
546 | goto abort; | |
547 | } | |
548 | ||
549 | if (sb->major_version != 0 || | |
550 | sb->minor_version != 90) { | |
551 | printk(KERN_WARNING "Bad version number %d.%d on %s\n", | |
552 | sb->major_version, sb->minor_version, | |
553 | b); | |
554 | goto abort; | |
555 | } | |
556 | ||
557 | if (sb->raid_disks <= 0) | |
558 | goto abort; | |
559 | ||
560 | if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) { | |
561 | printk(KERN_WARNING "md: invalid superblock checksum on %s\n", | |
562 | b); | |
563 | goto abort; | |
564 | } | |
565 | ||
566 | rdev->preferred_minor = sb->md_minor; | |
567 | rdev->data_offset = 0; | |
0002b271 | 568 | rdev->sb_size = MD_SB_BYTES; |
1da177e4 LT |
569 | |
570 | if (sb->level == LEVEL_MULTIPATH) | |
571 | rdev->desc_nr = -1; | |
572 | else | |
573 | rdev->desc_nr = sb->this_disk.number; | |
574 | ||
575 | if (refdev == 0) | |
576 | ret = 1; | |
577 | else { | |
578 | __u64 ev1, ev2; | |
579 | mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page); | |
580 | if (!uuid_equal(refsb, sb)) { | |
581 | printk(KERN_WARNING "md: %s has different UUID to %s\n", | |
582 | b, bdevname(refdev->bdev,b2)); | |
583 | goto abort; | |
584 | } | |
585 | if (!sb_equal(refsb, sb)) { | |
586 | printk(KERN_WARNING "md: %s has same UUID" | |
587 | " but different superblock to %s\n", | |
588 | b, bdevname(refdev->bdev, b2)); | |
589 | goto abort; | |
590 | } | |
591 | ev1 = md_event(sb); | |
592 | ev2 = md_event(refsb); | |
593 | if (ev1 > ev2) | |
594 | ret = 1; | |
595 | else | |
596 | ret = 0; | |
597 | } | |
598 | rdev->size = calc_dev_size(rdev, sb->chunk_size); | |
599 | ||
600 | abort: | |
601 | return ret; | |
602 | } | |
603 | ||
604 | /* | |
605 | * validate_super for 0.90.0 | |
606 | */ | |
607 | static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
608 | { | |
609 | mdp_disk_t *desc; | |
610 | mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page); | |
611 | ||
41158c7e | 612 | rdev->raid_disk = -1; |
b2d444d7 | 613 | rdev->flags = 0; |
1da177e4 LT |
614 | if (mddev->raid_disks == 0) { |
615 | mddev->major_version = 0; | |
616 | mddev->minor_version = sb->minor_version; | |
617 | mddev->patch_version = sb->patch_version; | |
618 | mddev->persistent = ! sb->not_persistent; | |
619 | mddev->chunk_size = sb->chunk_size; | |
620 | mddev->ctime = sb->ctime; | |
621 | mddev->utime = sb->utime; | |
622 | mddev->level = sb->level; | |
623 | mddev->layout = sb->layout; | |
624 | mddev->raid_disks = sb->raid_disks; | |
625 | mddev->size = sb->size; | |
626 | mddev->events = md_event(sb); | |
9223214e | 627 | mddev->bitmap_offset = 0; |
36fa3063 | 628 | mddev->default_bitmap_offset = MD_SB_BYTES >> 9; |
1da177e4 LT |
629 | |
630 | if (sb->state & (1<<MD_SB_CLEAN)) | |
631 | mddev->recovery_cp = MaxSector; | |
632 | else { | |
633 | if (sb->events_hi == sb->cp_events_hi && | |
634 | sb->events_lo == sb->cp_events_lo) { | |
635 | mddev->recovery_cp = sb->recovery_cp; | |
636 | } else | |
637 | mddev->recovery_cp = 0; | |
638 | } | |
639 | ||
640 | memcpy(mddev->uuid+0, &sb->set_uuid0, 4); | |
641 | memcpy(mddev->uuid+4, &sb->set_uuid1, 4); | |
642 | memcpy(mddev->uuid+8, &sb->set_uuid2, 4); | |
643 | memcpy(mddev->uuid+12,&sb->set_uuid3, 4); | |
644 | ||
645 | mddev->max_disks = MD_SB_DISKS; | |
a654b9d8 N |
646 | |
647 | if (sb->state & (1<<MD_SB_BITMAP_PRESENT) && | |
648 | mddev->bitmap_file == NULL) { | |
934ce7c8 | 649 | if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6) { |
a654b9d8 N |
650 | /* FIXME use a better test */ |
651 | printk(KERN_WARNING "md: bitmaps only support for raid1\n"); | |
652 | return -EINVAL; | |
653 | } | |
36fa3063 | 654 | mddev->bitmap_offset = mddev->default_bitmap_offset; |
a654b9d8 N |
655 | } |
656 | ||
41158c7e N |
657 | } else if (mddev->pers == NULL) { |
658 | /* Insist on good event counter while assembling */ | |
659 | __u64 ev1 = md_event(sb); | |
1da177e4 LT |
660 | ++ev1; |
661 | if (ev1 < mddev->events) | |
662 | return -EINVAL; | |
41158c7e N |
663 | } else if (mddev->bitmap) { |
664 | /* if adding to array with a bitmap, then we can accept an | |
665 | * older device ... but not too old. | |
666 | */ | |
667 | __u64 ev1 = md_event(sb); | |
668 | if (ev1 < mddev->bitmap->events_cleared) | |
669 | return 0; | |
670 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
671 | return 0; | |
672 | ||
1da177e4 | 673 | if (mddev->level != LEVEL_MULTIPATH) { |
1da177e4 LT |
674 | desc = sb->disks + rdev->desc_nr; |
675 | ||
676 | if (desc->state & (1<<MD_DISK_FAULTY)) | |
b2d444d7 | 677 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
678 | else if (desc->state & (1<<MD_DISK_SYNC) && |
679 | desc->raid_disk < mddev->raid_disks) { | |
b2d444d7 | 680 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
681 | rdev->raid_disk = desc->raid_disk; |
682 | } | |
8ddf9efe N |
683 | if (desc->state & (1<<MD_DISK_WRITEMOSTLY)) |
684 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 685 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 686 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
687 | return 0; |
688 | } | |
689 | ||
690 | /* | |
691 | * sync_super for 0.90.0 | |
692 | */ | |
693 | static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
694 | { | |
695 | mdp_super_t *sb; | |
696 | struct list_head *tmp; | |
697 | mdk_rdev_t *rdev2; | |
698 | int next_spare = mddev->raid_disks; | |
31399d9e | 699 | char nm[20]; |
1da177e4 LT |
700 | |
701 | /* make rdev->sb match mddev data.. | |
702 | * | |
703 | * 1/ zero out disks | |
704 | * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare); | |
705 | * 3/ any empty disks < next_spare become removed | |
706 | * | |
707 | * disks[0] gets initialised to REMOVED because | |
708 | * we cannot be sure from other fields if it has | |
709 | * been initialised or not. | |
710 | */ | |
711 | int i; | |
712 | int active=0, working=0,failed=0,spare=0,nr_disks=0; | |
86e6ffdd | 713 | unsigned int fixdesc=0; |
1da177e4 | 714 | |
61181565 N |
715 | rdev->sb_size = MD_SB_BYTES; |
716 | ||
1da177e4 LT |
717 | sb = (mdp_super_t*)page_address(rdev->sb_page); |
718 | ||
719 | memset(sb, 0, sizeof(*sb)); | |
720 | ||
721 | sb->md_magic = MD_SB_MAGIC; | |
722 | sb->major_version = mddev->major_version; | |
723 | sb->minor_version = mddev->minor_version; | |
724 | sb->patch_version = mddev->patch_version; | |
725 | sb->gvalid_words = 0; /* ignored */ | |
726 | memcpy(&sb->set_uuid0, mddev->uuid+0, 4); | |
727 | memcpy(&sb->set_uuid1, mddev->uuid+4, 4); | |
728 | memcpy(&sb->set_uuid2, mddev->uuid+8, 4); | |
729 | memcpy(&sb->set_uuid3, mddev->uuid+12,4); | |
730 | ||
731 | sb->ctime = mddev->ctime; | |
732 | sb->level = mddev->level; | |
733 | sb->size = mddev->size; | |
734 | sb->raid_disks = mddev->raid_disks; | |
735 | sb->md_minor = mddev->md_minor; | |
736 | sb->not_persistent = !mddev->persistent; | |
737 | sb->utime = mddev->utime; | |
738 | sb->state = 0; | |
739 | sb->events_hi = (mddev->events>>32); | |
740 | sb->events_lo = (u32)mddev->events; | |
741 | ||
742 | if (mddev->in_sync) | |
743 | { | |
744 | sb->recovery_cp = mddev->recovery_cp; | |
745 | sb->cp_events_hi = (mddev->events>>32); | |
746 | sb->cp_events_lo = (u32)mddev->events; | |
747 | if (mddev->recovery_cp == MaxSector) | |
748 | sb->state = (1<< MD_SB_CLEAN); | |
749 | } else | |
750 | sb->recovery_cp = 0; | |
751 | ||
752 | sb->layout = mddev->layout; | |
753 | sb->chunk_size = mddev->chunk_size; | |
754 | ||
a654b9d8 N |
755 | if (mddev->bitmap && mddev->bitmap_file == NULL) |
756 | sb->state |= (1<<MD_SB_BITMAP_PRESENT); | |
757 | ||
1da177e4 LT |
758 | sb->disks[0].state = (1<<MD_DISK_REMOVED); |
759 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
760 | mdp_disk_t *d; | |
86e6ffdd | 761 | int desc_nr; |
b2d444d7 N |
762 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
763 | && !test_bit(Faulty, &rdev2->flags)) | |
86e6ffdd | 764 | desc_nr = rdev2->raid_disk; |
1da177e4 | 765 | else |
86e6ffdd N |
766 | desc_nr = next_spare++; |
767 | if (desc_nr != rdev2->desc_nr) { | |
768 | fixdesc |= (1 << desc_nr); | |
769 | rdev2->desc_nr = desc_nr; | |
770 | if (rdev2->raid_disk >= 0) { | |
86e6ffdd N |
771 | sprintf(nm, "rd%d", rdev2->raid_disk); |
772 | sysfs_remove_link(&mddev->kobj, nm); | |
773 | } | |
774 | sysfs_remove_link(&rdev2->kobj, "block"); | |
775 | kobject_del(&rdev2->kobj); | |
776 | } | |
1da177e4 LT |
777 | d = &sb->disks[rdev2->desc_nr]; |
778 | nr_disks++; | |
779 | d->number = rdev2->desc_nr; | |
780 | d->major = MAJOR(rdev2->bdev->bd_dev); | |
781 | d->minor = MINOR(rdev2->bdev->bd_dev); | |
b2d444d7 N |
782 | if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags) |
783 | && !test_bit(Faulty, &rdev2->flags)) | |
1da177e4 LT |
784 | d->raid_disk = rdev2->raid_disk; |
785 | else | |
786 | d->raid_disk = rdev2->desc_nr; /* compatibility */ | |
b2d444d7 | 787 | if (test_bit(Faulty, &rdev2->flags)) { |
1da177e4 LT |
788 | d->state = (1<<MD_DISK_FAULTY); |
789 | failed++; | |
b2d444d7 | 790 | } else if (test_bit(In_sync, &rdev2->flags)) { |
1da177e4 LT |
791 | d->state = (1<<MD_DISK_ACTIVE); |
792 | d->state |= (1<<MD_DISK_SYNC); | |
793 | active++; | |
794 | working++; | |
795 | } else { | |
796 | d->state = 0; | |
797 | spare++; | |
798 | working++; | |
799 | } | |
8ddf9efe N |
800 | if (test_bit(WriteMostly, &rdev2->flags)) |
801 | d->state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 | 802 | } |
86e6ffdd N |
803 | if (fixdesc) |
804 | ITERATE_RDEV(mddev,rdev2,tmp) | |
805 | if (fixdesc & (1<<rdev2->desc_nr)) { | |
806 | snprintf(rdev2->kobj.name, KOBJ_NAME_LEN, "dev%d", | |
807 | rdev2->desc_nr); | |
9c791977 N |
808 | /* kobject_add gets a ref on the parent, so |
809 | * we have to drop the one we already have | |
810 | */ | |
86e6ffdd | 811 | kobject_add(&rdev2->kobj); |
9c791977 | 812 | kobject_put(rdev->kobj.parent); |
86e6ffdd N |
813 | sysfs_create_link(&rdev2->kobj, |
814 | &rdev2->bdev->bd_disk->kobj, | |
815 | "block"); | |
816 | if (rdev2->raid_disk >= 0) { | |
86e6ffdd N |
817 | sprintf(nm, "rd%d", rdev2->raid_disk); |
818 | sysfs_create_link(&mddev->kobj, | |
819 | &rdev2->kobj, nm); | |
820 | } | |
821 | } | |
1da177e4 LT |
822 | /* now set the "removed" and "faulty" bits on any missing devices */ |
823 | for (i=0 ; i < mddev->raid_disks ; i++) { | |
824 | mdp_disk_t *d = &sb->disks[i]; | |
825 | if (d->state == 0 && d->number == 0) { | |
826 | d->number = i; | |
827 | d->raid_disk = i; | |
828 | d->state = (1<<MD_DISK_REMOVED); | |
829 | d->state |= (1<<MD_DISK_FAULTY); | |
830 | failed++; | |
831 | } | |
832 | } | |
833 | sb->nr_disks = nr_disks; | |
834 | sb->active_disks = active; | |
835 | sb->working_disks = working; | |
836 | sb->failed_disks = failed; | |
837 | sb->spare_disks = spare; | |
838 | ||
839 | sb->this_disk = sb->disks[rdev->desc_nr]; | |
840 | sb->sb_csum = calc_sb_csum(sb); | |
841 | } | |
842 | ||
843 | /* | |
844 | * version 1 superblock | |
845 | */ | |
846 | ||
847 | static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb) | |
848 | { | |
849 | unsigned int disk_csum, csum; | |
850 | unsigned long long newcsum; | |
851 | int size = 256 + le32_to_cpu(sb->max_dev)*2; | |
852 | unsigned int *isuper = (unsigned int*)sb; | |
853 | int i; | |
854 | ||
855 | disk_csum = sb->sb_csum; | |
856 | sb->sb_csum = 0; | |
857 | newcsum = 0; | |
858 | for (i=0; size>=4; size -= 4 ) | |
859 | newcsum += le32_to_cpu(*isuper++); | |
860 | ||
861 | if (size == 2) | |
862 | newcsum += le16_to_cpu(*(unsigned short*) isuper); | |
863 | ||
864 | csum = (newcsum & 0xffffffff) + (newcsum >> 32); | |
865 | sb->sb_csum = disk_csum; | |
866 | return cpu_to_le32(csum); | |
867 | } | |
868 | ||
869 | static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version) | |
870 | { | |
871 | struct mdp_superblock_1 *sb; | |
872 | int ret; | |
873 | sector_t sb_offset; | |
874 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
0002b271 | 875 | int bmask; |
1da177e4 LT |
876 | |
877 | /* | |
878 | * Calculate the position of the superblock. | |
879 | * It is always aligned to a 4K boundary and | |
880 | * depeding on minor_version, it can be: | |
881 | * 0: At least 8K, but less than 12K, from end of device | |
882 | * 1: At start of device | |
883 | * 2: 4K from start of device. | |
884 | */ | |
885 | switch(minor_version) { | |
886 | case 0: | |
887 | sb_offset = rdev->bdev->bd_inode->i_size >> 9; | |
888 | sb_offset -= 8*2; | |
39730960 | 889 | sb_offset &= ~(sector_t)(4*2-1); |
1da177e4 LT |
890 | /* convert from sectors to K */ |
891 | sb_offset /= 2; | |
892 | break; | |
893 | case 1: | |
894 | sb_offset = 0; | |
895 | break; | |
896 | case 2: | |
897 | sb_offset = 4; | |
898 | break; | |
899 | default: | |
900 | return -EINVAL; | |
901 | } | |
902 | rdev->sb_offset = sb_offset; | |
903 | ||
0002b271 N |
904 | /* superblock is rarely larger than 1K, but it can be larger, |
905 | * and it is safe to read 4k, so we do that | |
906 | */ | |
907 | ret = read_disk_sb(rdev, 4096); | |
1da177e4 LT |
908 | if (ret) return ret; |
909 | ||
910 | ||
911 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
912 | ||
913 | if (sb->magic != cpu_to_le32(MD_SB_MAGIC) || | |
914 | sb->major_version != cpu_to_le32(1) || | |
915 | le32_to_cpu(sb->max_dev) > (4096-256)/2 || | |
916 | le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) || | |
71c0805c | 917 | (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0) |
1da177e4 LT |
918 | return -EINVAL; |
919 | ||
920 | if (calc_sb_1_csum(sb) != sb->sb_csum) { | |
921 | printk("md: invalid superblock checksum on %s\n", | |
922 | bdevname(rdev->bdev,b)); | |
923 | return -EINVAL; | |
924 | } | |
925 | if (le64_to_cpu(sb->data_size) < 10) { | |
926 | printk("md: data_size too small on %s\n", | |
927 | bdevname(rdev->bdev,b)); | |
928 | return -EINVAL; | |
929 | } | |
930 | rdev->preferred_minor = 0xffff; | |
931 | rdev->data_offset = le64_to_cpu(sb->data_offset); | |
932 | ||
0002b271 | 933 | rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256; |
720a3dc3 | 934 | bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1; |
0002b271 N |
935 | if (rdev->sb_size & bmask) |
936 | rdev-> sb_size = (rdev->sb_size | bmask)+1; | |
937 | ||
1da177e4 LT |
938 | if (refdev == 0) |
939 | return 1; | |
940 | else { | |
941 | __u64 ev1, ev2; | |
942 | struct mdp_superblock_1 *refsb = | |
943 | (struct mdp_superblock_1*)page_address(refdev->sb_page); | |
944 | ||
945 | if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 || | |
946 | sb->level != refsb->level || | |
947 | sb->layout != refsb->layout || | |
948 | sb->chunksize != refsb->chunksize) { | |
949 | printk(KERN_WARNING "md: %s has strangely different" | |
950 | " superblock to %s\n", | |
951 | bdevname(rdev->bdev,b), | |
952 | bdevname(refdev->bdev,b2)); | |
953 | return -EINVAL; | |
954 | } | |
955 | ev1 = le64_to_cpu(sb->events); | |
956 | ev2 = le64_to_cpu(refsb->events); | |
957 | ||
958 | if (ev1 > ev2) | |
959 | return 1; | |
960 | } | |
961 | if (minor_version) | |
962 | rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2; | |
963 | else | |
964 | rdev->size = rdev->sb_offset; | |
965 | if (rdev->size < le64_to_cpu(sb->data_size)/2) | |
966 | return -EINVAL; | |
967 | rdev->size = le64_to_cpu(sb->data_size)/2; | |
968 | if (le32_to_cpu(sb->chunksize)) | |
969 | rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1); | |
970 | return 0; | |
971 | } | |
972 | ||
973 | static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) | |
974 | { | |
975 | struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
976 | ||
41158c7e | 977 | rdev->raid_disk = -1; |
b2d444d7 | 978 | rdev->flags = 0; |
1da177e4 LT |
979 | if (mddev->raid_disks == 0) { |
980 | mddev->major_version = 1; | |
981 | mddev->patch_version = 0; | |
982 | mddev->persistent = 1; | |
983 | mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9; | |
984 | mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1); | |
985 | mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1); | |
986 | mddev->level = le32_to_cpu(sb->level); | |
987 | mddev->layout = le32_to_cpu(sb->layout); | |
988 | mddev->raid_disks = le32_to_cpu(sb->raid_disks); | |
989 | mddev->size = le64_to_cpu(sb->size)/2; | |
990 | mddev->events = le64_to_cpu(sb->events); | |
9223214e | 991 | mddev->bitmap_offset = 0; |
36fa3063 | 992 | mddev->default_bitmap_offset = 0; |
53e87fbb | 993 | mddev->default_bitmap_offset = 1024; |
1da177e4 LT |
994 | |
995 | mddev->recovery_cp = le64_to_cpu(sb->resync_offset); | |
996 | memcpy(mddev->uuid, sb->set_uuid, 16); | |
997 | ||
998 | mddev->max_disks = (4096-256)/2; | |
a654b9d8 | 999 | |
71c0805c | 1000 | if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) && |
a654b9d8 N |
1001 | mddev->bitmap_file == NULL ) { |
1002 | if (mddev->level != 1) { | |
1003 | printk(KERN_WARNING "md: bitmaps only supported for raid1\n"); | |
1004 | return -EINVAL; | |
1005 | } | |
1006 | mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset); | |
1007 | } | |
41158c7e N |
1008 | } else if (mddev->pers == NULL) { |
1009 | /* Insist of good event counter while assembling */ | |
1010 | __u64 ev1 = le64_to_cpu(sb->events); | |
1da177e4 LT |
1011 | ++ev1; |
1012 | if (ev1 < mddev->events) | |
1013 | return -EINVAL; | |
41158c7e N |
1014 | } else if (mddev->bitmap) { |
1015 | /* If adding to array with a bitmap, then we can accept an | |
1016 | * older device, but not too old. | |
1017 | */ | |
1018 | __u64 ev1 = le64_to_cpu(sb->events); | |
1019 | if (ev1 < mddev->bitmap->events_cleared) | |
1020 | return 0; | |
1021 | } else /* just a hot-add of a new device, leave raid_disk at -1 */ | |
1022 | return 0; | |
1da177e4 LT |
1023 | |
1024 | if (mddev->level != LEVEL_MULTIPATH) { | |
1025 | int role; | |
1026 | rdev->desc_nr = le32_to_cpu(sb->dev_number); | |
1027 | role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]); | |
1028 | switch(role) { | |
1029 | case 0xffff: /* spare */ | |
1da177e4 LT |
1030 | break; |
1031 | case 0xfffe: /* faulty */ | |
b2d444d7 | 1032 | set_bit(Faulty, &rdev->flags); |
1da177e4 LT |
1033 | break; |
1034 | default: | |
b2d444d7 | 1035 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1036 | rdev->raid_disk = role; |
1037 | break; | |
1038 | } | |
8ddf9efe N |
1039 | if (sb->devflags & WriteMostly1) |
1040 | set_bit(WriteMostly, &rdev->flags); | |
41158c7e | 1041 | } else /* MULTIPATH are always insync */ |
b2d444d7 | 1042 | set_bit(In_sync, &rdev->flags); |
41158c7e | 1043 | |
1da177e4 LT |
1044 | return 0; |
1045 | } | |
1046 | ||
1047 | static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) | |
1048 | { | |
1049 | struct mdp_superblock_1 *sb; | |
1050 | struct list_head *tmp; | |
1051 | mdk_rdev_t *rdev2; | |
1052 | int max_dev, i; | |
1053 | /* make rdev->sb match mddev and rdev data. */ | |
1054 | ||
1055 | sb = (struct mdp_superblock_1*)page_address(rdev->sb_page); | |
1056 | ||
1057 | sb->feature_map = 0; | |
1058 | sb->pad0 = 0; | |
1059 | memset(sb->pad1, 0, sizeof(sb->pad1)); | |
1060 | memset(sb->pad2, 0, sizeof(sb->pad2)); | |
1061 | memset(sb->pad3, 0, sizeof(sb->pad3)); | |
1062 | ||
1063 | sb->utime = cpu_to_le64((__u64)mddev->utime); | |
1064 | sb->events = cpu_to_le64(mddev->events); | |
1065 | if (mddev->in_sync) | |
1066 | sb->resync_offset = cpu_to_le64(mddev->recovery_cp); | |
1067 | else | |
1068 | sb->resync_offset = cpu_to_le64(0); | |
1069 | ||
a654b9d8 N |
1070 | if (mddev->bitmap && mddev->bitmap_file == NULL) { |
1071 | sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset); | |
71c0805c | 1072 | sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET); |
a654b9d8 N |
1073 | } |
1074 | ||
1da177e4 LT |
1075 | max_dev = 0; |
1076 | ITERATE_RDEV(mddev,rdev2,tmp) | |
1077 | if (rdev2->desc_nr+1 > max_dev) | |
1078 | max_dev = rdev2->desc_nr+1; | |
1079 | ||
1080 | sb->max_dev = cpu_to_le32(max_dev); | |
1081 | for (i=0; i<max_dev;i++) | |
1082 | sb->dev_roles[i] = cpu_to_le16(0xfffe); | |
1083 | ||
1084 | ITERATE_RDEV(mddev,rdev2,tmp) { | |
1085 | i = rdev2->desc_nr; | |
b2d444d7 | 1086 | if (test_bit(Faulty, &rdev2->flags)) |
1da177e4 | 1087 | sb->dev_roles[i] = cpu_to_le16(0xfffe); |
b2d444d7 | 1088 | else if (test_bit(In_sync, &rdev2->flags)) |
1da177e4 LT |
1089 | sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk); |
1090 | else | |
1091 | sb->dev_roles[i] = cpu_to_le16(0xffff); | |
1092 | } | |
1093 | ||
1094 | sb->recovery_offset = cpu_to_le64(0); /* not supported yet */ | |
1095 | sb->sb_csum = calc_sb_1_csum(sb); | |
1096 | } | |
1097 | ||
1098 | ||
75c96f85 | 1099 | static struct super_type super_types[] = { |
1da177e4 LT |
1100 | [0] = { |
1101 | .name = "0.90.0", | |
1102 | .owner = THIS_MODULE, | |
1103 | .load_super = super_90_load, | |
1104 | .validate_super = super_90_validate, | |
1105 | .sync_super = super_90_sync, | |
1106 | }, | |
1107 | [1] = { | |
1108 | .name = "md-1", | |
1109 | .owner = THIS_MODULE, | |
1110 | .load_super = super_1_load, | |
1111 | .validate_super = super_1_validate, | |
1112 | .sync_super = super_1_sync, | |
1113 | }, | |
1114 | }; | |
1115 | ||
1116 | static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev) | |
1117 | { | |
1118 | struct list_head *tmp; | |
1119 | mdk_rdev_t *rdev; | |
1120 | ||
1121 | ITERATE_RDEV(mddev,rdev,tmp) | |
1122 | if (rdev->bdev->bd_contains == dev->bdev->bd_contains) | |
1123 | return rdev; | |
1124 | ||
1125 | return NULL; | |
1126 | } | |
1127 | ||
1128 | static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2) | |
1129 | { | |
1130 | struct list_head *tmp; | |
1131 | mdk_rdev_t *rdev; | |
1132 | ||
1133 | ITERATE_RDEV(mddev1,rdev,tmp) | |
1134 | if (match_dev_unit(mddev2, rdev)) | |
1135 | return 1; | |
1136 | ||
1137 | return 0; | |
1138 | } | |
1139 | ||
1140 | static LIST_HEAD(pending_raid_disks); | |
1141 | ||
1142 | static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev) | |
1143 | { | |
1144 | mdk_rdev_t *same_pdev; | |
1145 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
1146 | ||
1147 | if (rdev->mddev) { | |
1148 | MD_BUG(); | |
1149 | return -EINVAL; | |
1150 | } | |
1151 | same_pdev = match_dev_unit(mddev, rdev); | |
1152 | if (same_pdev) | |
1153 | printk(KERN_WARNING | |
1154 | "%s: WARNING: %s appears to be on the same physical" | |
1155 | " disk as %s. True\n protection against single-disk" | |
1156 | " failure might be compromised.\n", | |
1157 | mdname(mddev), bdevname(rdev->bdev,b), | |
1158 | bdevname(same_pdev->bdev,b2)); | |
1159 | ||
1160 | /* Verify rdev->desc_nr is unique. | |
1161 | * If it is -1, assign a free number, else | |
1162 | * check number is not in use | |
1163 | */ | |
1164 | if (rdev->desc_nr < 0) { | |
1165 | int choice = 0; | |
1166 | if (mddev->pers) choice = mddev->raid_disks; | |
1167 | while (find_rdev_nr(mddev, choice)) | |
1168 | choice++; | |
1169 | rdev->desc_nr = choice; | |
1170 | } else { | |
1171 | if (find_rdev_nr(mddev, rdev->desc_nr)) | |
1172 | return -EBUSY; | |
1173 | } | |
1174 | ||
1175 | list_add(&rdev->same_set, &mddev->disks); | |
1176 | rdev->mddev = mddev; | |
1177 | printk(KERN_INFO "md: bind<%s>\n", bdevname(rdev->bdev,b)); | |
86e6ffdd N |
1178 | |
1179 | rdev->kobj.k_name = NULL; | |
1180 | snprintf(rdev->kobj.name, KOBJ_NAME_LEN, "dev%d", rdev->desc_nr); | |
9c791977 | 1181 | rdev->kobj.parent = &mddev->kobj; |
86e6ffdd N |
1182 | kobject_add(&rdev->kobj); |
1183 | ||
1184 | sysfs_create_link(&rdev->kobj, &rdev->bdev->bd_disk->kobj, "block"); | |
1da177e4 LT |
1185 | return 0; |
1186 | } | |
1187 | ||
1188 | static void unbind_rdev_from_array(mdk_rdev_t * rdev) | |
1189 | { | |
1190 | char b[BDEVNAME_SIZE]; | |
1191 | if (!rdev->mddev) { | |
1192 | MD_BUG(); | |
1193 | return; | |
1194 | } | |
1195 | list_del_init(&rdev->same_set); | |
1196 | printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b)); | |
1197 | rdev->mddev = NULL; | |
86e6ffdd N |
1198 | sysfs_remove_link(&rdev->kobj, "block"); |
1199 | kobject_del(&rdev->kobj); | |
1da177e4 LT |
1200 | } |
1201 | ||
1202 | /* | |
1203 | * prevent the device from being mounted, repartitioned or | |
1204 | * otherwise reused by a RAID array (or any other kernel | |
1205 | * subsystem), by bd_claiming the device. | |
1206 | */ | |
1207 | static int lock_rdev(mdk_rdev_t *rdev, dev_t dev) | |
1208 | { | |
1209 | int err = 0; | |
1210 | struct block_device *bdev; | |
1211 | char b[BDEVNAME_SIZE]; | |
1212 | ||
1213 | bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE); | |
1214 | if (IS_ERR(bdev)) { | |
1215 | printk(KERN_ERR "md: could not open %s.\n", | |
1216 | __bdevname(dev, b)); | |
1217 | return PTR_ERR(bdev); | |
1218 | } | |
1219 | err = bd_claim(bdev, rdev); | |
1220 | if (err) { | |
1221 | printk(KERN_ERR "md: could not bd_claim %s.\n", | |
1222 | bdevname(bdev, b)); | |
1223 | blkdev_put(bdev); | |
1224 | return err; | |
1225 | } | |
1226 | rdev->bdev = bdev; | |
1227 | return err; | |
1228 | } | |
1229 | ||
1230 | static void unlock_rdev(mdk_rdev_t *rdev) | |
1231 | { | |
1232 | struct block_device *bdev = rdev->bdev; | |
1233 | rdev->bdev = NULL; | |
1234 | if (!bdev) | |
1235 | MD_BUG(); | |
1236 | bd_release(bdev); | |
1237 | blkdev_put(bdev); | |
1238 | } | |
1239 | ||
1240 | void md_autodetect_dev(dev_t dev); | |
1241 | ||
1242 | static void export_rdev(mdk_rdev_t * rdev) | |
1243 | { | |
1244 | char b[BDEVNAME_SIZE]; | |
1245 | printk(KERN_INFO "md: export_rdev(%s)\n", | |
1246 | bdevname(rdev->bdev,b)); | |
1247 | if (rdev->mddev) | |
1248 | MD_BUG(); | |
1249 | free_disk_sb(rdev); | |
1250 | list_del_init(&rdev->same_set); | |
1251 | #ifndef MODULE | |
1252 | md_autodetect_dev(rdev->bdev->bd_dev); | |
1253 | #endif | |
1254 | unlock_rdev(rdev); | |
86e6ffdd | 1255 | kobject_put(&rdev->kobj); |
1da177e4 LT |
1256 | } |
1257 | ||
1258 | static void kick_rdev_from_array(mdk_rdev_t * rdev) | |
1259 | { | |
1260 | unbind_rdev_from_array(rdev); | |
1261 | export_rdev(rdev); | |
1262 | } | |
1263 | ||
1264 | static void export_array(mddev_t *mddev) | |
1265 | { | |
1266 | struct list_head *tmp; | |
1267 | mdk_rdev_t *rdev; | |
1268 | ||
1269 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1270 | if (!rdev->mddev) { | |
1271 | MD_BUG(); | |
1272 | continue; | |
1273 | } | |
1274 | kick_rdev_from_array(rdev); | |
1275 | } | |
1276 | if (!list_empty(&mddev->disks)) | |
1277 | MD_BUG(); | |
1278 | mddev->raid_disks = 0; | |
1279 | mddev->major_version = 0; | |
1280 | } | |
1281 | ||
1282 | static void print_desc(mdp_disk_t *desc) | |
1283 | { | |
1284 | printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number, | |
1285 | desc->major,desc->minor,desc->raid_disk,desc->state); | |
1286 | } | |
1287 | ||
1288 | static void print_sb(mdp_super_t *sb) | |
1289 | { | |
1290 | int i; | |
1291 | ||
1292 | printk(KERN_INFO | |
1293 | "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n", | |
1294 | sb->major_version, sb->minor_version, sb->patch_version, | |
1295 | sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3, | |
1296 | sb->ctime); | |
1297 | printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n", | |
1298 | sb->level, sb->size, sb->nr_disks, sb->raid_disks, | |
1299 | sb->md_minor, sb->layout, sb->chunk_size); | |
1300 | printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d" | |
1301 | " FD:%d SD:%d CSUM:%08x E:%08lx\n", | |
1302 | sb->utime, sb->state, sb->active_disks, sb->working_disks, | |
1303 | sb->failed_disks, sb->spare_disks, | |
1304 | sb->sb_csum, (unsigned long)sb->events_lo); | |
1305 | ||
1306 | printk(KERN_INFO); | |
1307 | for (i = 0; i < MD_SB_DISKS; i++) { | |
1308 | mdp_disk_t *desc; | |
1309 | ||
1310 | desc = sb->disks + i; | |
1311 | if (desc->number || desc->major || desc->minor || | |
1312 | desc->raid_disk || (desc->state && (desc->state != 4))) { | |
1313 | printk(" D %2d: ", i); | |
1314 | print_desc(desc); | |
1315 | } | |
1316 | } | |
1317 | printk(KERN_INFO "md: THIS: "); | |
1318 | print_desc(&sb->this_disk); | |
1319 | ||
1320 | } | |
1321 | ||
1322 | static void print_rdev(mdk_rdev_t *rdev) | |
1323 | { | |
1324 | char b[BDEVNAME_SIZE]; | |
1325 | printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n", | |
1326 | bdevname(rdev->bdev,b), (unsigned long long)rdev->size, | |
b2d444d7 N |
1327 | test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags), |
1328 | rdev->desc_nr); | |
1da177e4 LT |
1329 | if (rdev->sb_loaded) { |
1330 | printk(KERN_INFO "md: rdev superblock:\n"); | |
1331 | print_sb((mdp_super_t*)page_address(rdev->sb_page)); | |
1332 | } else | |
1333 | printk(KERN_INFO "md: no rdev superblock!\n"); | |
1334 | } | |
1335 | ||
1336 | void md_print_devices(void) | |
1337 | { | |
1338 | struct list_head *tmp, *tmp2; | |
1339 | mdk_rdev_t *rdev; | |
1340 | mddev_t *mddev; | |
1341 | char b[BDEVNAME_SIZE]; | |
1342 | ||
1343 | printk("\n"); | |
1344 | printk("md: **********************************\n"); | |
1345 | printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n"); | |
1346 | printk("md: **********************************\n"); | |
1347 | ITERATE_MDDEV(mddev,tmp) { | |
1da177e4 | 1348 | |
32a7627c N |
1349 | if (mddev->bitmap) |
1350 | bitmap_print_sb(mddev->bitmap); | |
1351 | else | |
1352 | printk("%s: ", mdname(mddev)); | |
1da177e4 LT |
1353 | ITERATE_RDEV(mddev,rdev,tmp2) |
1354 | printk("<%s>", bdevname(rdev->bdev,b)); | |
1355 | printk("\n"); | |
1356 | ||
1357 | ITERATE_RDEV(mddev,rdev,tmp2) | |
1358 | print_rdev(rdev); | |
1359 | } | |
1360 | printk("md: **********************************\n"); | |
1361 | printk("\n"); | |
1362 | } | |
1363 | ||
1364 | ||
1da177e4 LT |
1365 | static void sync_sbs(mddev_t * mddev) |
1366 | { | |
1367 | mdk_rdev_t *rdev; | |
1368 | struct list_head *tmp; | |
1369 | ||
1370 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1371 | super_types[mddev->major_version]. | |
1372 | sync_super(mddev, rdev); | |
1373 | rdev->sb_loaded = 1; | |
1374 | } | |
1375 | } | |
1376 | ||
1377 | static void md_update_sb(mddev_t * mddev) | |
1378 | { | |
7bfa19f2 | 1379 | int err; |
1da177e4 LT |
1380 | struct list_head *tmp; |
1381 | mdk_rdev_t *rdev; | |
06d91a5f | 1382 | int sync_req; |
1da177e4 | 1383 | |
1da177e4 | 1384 | repeat: |
06d91a5f N |
1385 | spin_lock(&mddev->write_lock); |
1386 | sync_req = mddev->in_sync; | |
1da177e4 LT |
1387 | mddev->utime = get_seconds(); |
1388 | mddev->events ++; | |
1389 | ||
1390 | if (!mddev->events) { | |
1391 | /* | |
1392 | * oops, this 64-bit counter should never wrap. | |
1393 | * Either we are in around ~1 trillion A.C., assuming | |
1394 | * 1 reboot per second, or we have a bug: | |
1395 | */ | |
1396 | MD_BUG(); | |
1397 | mddev->events --; | |
1398 | } | |
7bfa19f2 | 1399 | mddev->sb_dirty = 2; |
1da177e4 LT |
1400 | sync_sbs(mddev); |
1401 | ||
1402 | /* | |
1403 | * do not write anything to disk if using | |
1404 | * nonpersistent superblocks | |
1405 | */ | |
06d91a5f N |
1406 | if (!mddev->persistent) { |
1407 | mddev->sb_dirty = 0; | |
1408 | spin_unlock(&mddev->write_lock); | |
3d310eb7 | 1409 | wake_up(&mddev->sb_wait); |
1da177e4 | 1410 | return; |
06d91a5f N |
1411 | } |
1412 | spin_unlock(&mddev->write_lock); | |
1da177e4 LT |
1413 | |
1414 | dprintk(KERN_INFO | |
1415 | "md: updating %s RAID superblock on device (in sync %d)\n", | |
1416 | mdname(mddev),mddev->in_sync); | |
1417 | ||
32a7627c | 1418 | err = bitmap_update_sb(mddev->bitmap); |
1da177e4 LT |
1419 | ITERATE_RDEV(mddev,rdev,tmp) { |
1420 | char b[BDEVNAME_SIZE]; | |
1421 | dprintk(KERN_INFO "md: "); | |
b2d444d7 | 1422 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1423 | dprintk("(skipping faulty "); |
1424 | ||
1425 | dprintk("%s ", bdevname(rdev->bdev,b)); | |
b2d444d7 | 1426 | if (!test_bit(Faulty, &rdev->flags)) { |
7bfa19f2 | 1427 | md_super_write(mddev,rdev, |
0002b271 | 1428 | rdev->sb_offset<<1, rdev->sb_size, |
7bfa19f2 N |
1429 | rdev->sb_page); |
1430 | dprintk(KERN_INFO "(write) %s's sb offset: %llu\n", | |
1431 | bdevname(rdev->bdev,b), | |
1432 | (unsigned long long)rdev->sb_offset); | |
1433 | ||
1da177e4 LT |
1434 | } else |
1435 | dprintk(")\n"); | |
7bfa19f2 | 1436 | if (mddev->level == LEVEL_MULTIPATH) |
1da177e4 LT |
1437 | /* only need to write one superblock... */ |
1438 | break; | |
1439 | } | |
7bfa19f2 N |
1440 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); |
1441 | /* if there was a failure, sb_dirty was set to 1, and we re-write super */ | |
1442 | ||
06d91a5f | 1443 | spin_lock(&mddev->write_lock); |
7bfa19f2 | 1444 | if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) { |
06d91a5f N |
1445 | /* have to write it out again */ |
1446 | spin_unlock(&mddev->write_lock); | |
1447 | goto repeat; | |
1448 | } | |
1449 | mddev->sb_dirty = 0; | |
1450 | spin_unlock(&mddev->write_lock); | |
3d310eb7 | 1451 | wake_up(&mddev->sb_wait); |
06d91a5f | 1452 | |
1da177e4 LT |
1453 | } |
1454 | ||
86e6ffdd N |
1455 | struct rdev_sysfs_entry { |
1456 | struct attribute attr; | |
1457 | ssize_t (*show)(mdk_rdev_t *, char *); | |
1458 | ssize_t (*store)(mdk_rdev_t *, const char *, size_t); | |
1459 | }; | |
1460 | ||
1461 | static ssize_t | |
1462 | rdev_show_state(mdk_rdev_t *rdev, char *page) | |
1463 | { | |
1464 | char *sep = ""; | |
1465 | int len=0; | |
1466 | ||
b2d444d7 | 1467 | if (test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
1468 | len+= sprintf(page+len, "%sfaulty",sep); |
1469 | sep = ","; | |
1470 | } | |
b2d444d7 | 1471 | if (test_bit(In_sync, &rdev->flags)) { |
86e6ffdd N |
1472 | len += sprintf(page+len, "%sin_sync",sep); |
1473 | sep = ","; | |
1474 | } | |
b2d444d7 N |
1475 | if (!test_bit(Faulty, &rdev->flags) && |
1476 | !test_bit(In_sync, &rdev->flags)) { | |
86e6ffdd N |
1477 | len += sprintf(page+len, "%sspare", sep); |
1478 | sep = ","; | |
1479 | } | |
1480 | return len+sprintf(page+len, "\n"); | |
1481 | } | |
1482 | ||
1483 | static struct rdev_sysfs_entry rdev_state = { | |
1484 | .attr = {.name = "state", .mode = S_IRUGO }, | |
1485 | .show = rdev_show_state, | |
1486 | }; | |
1487 | ||
1488 | static ssize_t | |
1489 | rdev_show_super(mdk_rdev_t *rdev, char *page) | |
1490 | { | |
1491 | if (rdev->sb_loaded && rdev->sb_size) { | |
1492 | memcpy(page, page_address(rdev->sb_page), rdev->sb_size); | |
1493 | return rdev->sb_size; | |
1494 | } else | |
1495 | return 0; | |
1496 | } | |
1497 | static struct rdev_sysfs_entry rdev_super = { | |
1498 | .attr = {.name = "super", .mode = S_IRUGO }, | |
1499 | .show = rdev_show_super, | |
1500 | }; | |
1501 | static struct attribute *rdev_default_attrs[] = { | |
1502 | &rdev_state.attr, | |
1503 | &rdev_super.attr, | |
1504 | NULL, | |
1505 | }; | |
1506 | static ssize_t | |
1507 | rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1508 | { | |
1509 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1510 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1511 | ||
1512 | if (!entry->show) | |
1513 | return -EIO; | |
1514 | return entry->show(rdev, page); | |
1515 | } | |
1516 | ||
1517 | static ssize_t | |
1518 | rdev_attr_store(struct kobject *kobj, struct attribute *attr, | |
1519 | const char *page, size_t length) | |
1520 | { | |
1521 | struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr); | |
1522 | mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj); | |
1523 | ||
1524 | if (!entry->store) | |
1525 | return -EIO; | |
1526 | return entry->store(rdev, page, length); | |
1527 | } | |
1528 | ||
1529 | static void rdev_free(struct kobject *ko) | |
1530 | { | |
1531 | mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj); | |
1532 | kfree(rdev); | |
1533 | } | |
1534 | static struct sysfs_ops rdev_sysfs_ops = { | |
1535 | .show = rdev_attr_show, | |
1536 | .store = rdev_attr_store, | |
1537 | }; | |
1538 | static struct kobj_type rdev_ktype = { | |
1539 | .release = rdev_free, | |
1540 | .sysfs_ops = &rdev_sysfs_ops, | |
1541 | .default_attrs = rdev_default_attrs, | |
1542 | }; | |
1543 | ||
1da177e4 LT |
1544 | /* |
1545 | * Import a device. If 'super_format' >= 0, then sanity check the superblock | |
1546 | * | |
1547 | * mark the device faulty if: | |
1548 | * | |
1549 | * - the device is nonexistent (zero size) | |
1550 | * - the device has no valid superblock | |
1551 | * | |
1552 | * a faulty rdev _never_ has rdev->sb set. | |
1553 | */ | |
1554 | static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor) | |
1555 | { | |
1556 | char b[BDEVNAME_SIZE]; | |
1557 | int err; | |
1558 | mdk_rdev_t *rdev; | |
1559 | sector_t size; | |
1560 | ||
1561 | rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL); | |
1562 | if (!rdev) { | |
1563 | printk(KERN_ERR "md: could not alloc mem for new device!\n"); | |
1564 | return ERR_PTR(-ENOMEM); | |
1565 | } | |
1566 | memset(rdev, 0, sizeof(*rdev)); | |
1567 | ||
1568 | if ((err = alloc_disk_sb(rdev))) | |
1569 | goto abort_free; | |
1570 | ||
1571 | err = lock_rdev(rdev, newdev); | |
1572 | if (err) | |
1573 | goto abort_free; | |
1574 | ||
86e6ffdd N |
1575 | rdev->kobj.parent = NULL; |
1576 | rdev->kobj.ktype = &rdev_ktype; | |
1577 | kobject_init(&rdev->kobj); | |
1578 | ||
1da177e4 | 1579 | rdev->desc_nr = -1; |
b2d444d7 | 1580 | rdev->flags = 0; |
1da177e4 LT |
1581 | rdev->data_offset = 0; |
1582 | atomic_set(&rdev->nr_pending, 0); | |
ba22dcbf | 1583 | atomic_set(&rdev->read_errors, 0); |
1da177e4 LT |
1584 | |
1585 | size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
1586 | if (!size) { | |
1587 | printk(KERN_WARNING | |
1588 | "md: %s has zero or unknown size, marking faulty!\n", | |
1589 | bdevname(rdev->bdev,b)); | |
1590 | err = -EINVAL; | |
1591 | goto abort_free; | |
1592 | } | |
1593 | ||
1594 | if (super_format >= 0) { | |
1595 | err = super_types[super_format]. | |
1596 | load_super(rdev, NULL, super_minor); | |
1597 | if (err == -EINVAL) { | |
1598 | printk(KERN_WARNING | |
1599 | "md: %s has invalid sb, not importing!\n", | |
1600 | bdevname(rdev->bdev,b)); | |
1601 | goto abort_free; | |
1602 | } | |
1603 | if (err < 0) { | |
1604 | printk(KERN_WARNING | |
1605 | "md: could not read %s's sb, not importing!\n", | |
1606 | bdevname(rdev->bdev,b)); | |
1607 | goto abort_free; | |
1608 | } | |
1609 | } | |
1610 | INIT_LIST_HEAD(&rdev->same_set); | |
1611 | ||
1612 | return rdev; | |
1613 | ||
1614 | abort_free: | |
1615 | if (rdev->sb_page) { | |
1616 | if (rdev->bdev) | |
1617 | unlock_rdev(rdev); | |
1618 | free_disk_sb(rdev); | |
1619 | } | |
1620 | kfree(rdev); | |
1621 | return ERR_PTR(err); | |
1622 | } | |
1623 | ||
1624 | /* | |
1625 | * Check a full RAID array for plausibility | |
1626 | */ | |
1627 | ||
1628 | ||
a757e64c | 1629 | static void analyze_sbs(mddev_t * mddev) |
1da177e4 LT |
1630 | { |
1631 | int i; | |
1632 | struct list_head *tmp; | |
1633 | mdk_rdev_t *rdev, *freshest; | |
1634 | char b[BDEVNAME_SIZE]; | |
1635 | ||
1636 | freshest = NULL; | |
1637 | ITERATE_RDEV(mddev,rdev,tmp) | |
1638 | switch (super_types[mddev->major_version]. | |
1639 | load_super(rdev, freshest, mddev->minor_version)) { | |
1640 | case 1: | |
1641 | freshest = rdev; | |
1642 | break; | |
1643 | case 0: | |
1644 | break; | |
1645 | default: | |
1646 | printk( KERN_ERR \ | |
1647 | "md: fatal superblock inconsistency in %s" | |
1648 | " -- removing from array\n", | |
1649 | bdevname(rdev->bdev,b)); | |
1650 | kick_rdev_from_array(rdev); | |
1651 | } | |
1652 | ||
1653 | ||
1654 | super_types[mddev->major_version]. | |
1655 | validate_super(mddev, freshest); | |
1656 | ||
1657 | i = 0; | |
1658 | ITERATE_RDEV(mddev,rdev,tmp) { | |
1659 | if (rdev != freshest) | |
1660 | if (super_types[mddev->major_version]. | |
1661 | validate_super(mddev, rdev)) { | |
1662 | printk(KERN_WARNING "md: kicking non-fresh %s" | |
1663 | " from array!\n", | |
1664 | bdevname(rdev->bdev,b)); | |
1665 | kick_rdev_from_array(rdev); | |
1666 | continue; | |
1667 | } | |
1668 | if (mddev->level == LEVEL_MULTIPATH) { | |
1669 | rdev->desc_nr = i++; | |
1670 | rdev->raid_disk = rdev->desc_nr; | |
b2d444d7 | 1671 | set_bit(In_sync, &rdev->flags); |
1da177e4 LT |
1672 | } |
1673 | } | |
1674 | ||
1675 | ||
1676 | ||
1677 | if (mddev->recovery_cp != MaxSector && | |
1678 | mddev->level >= 1) | |
1679 | printk(KERN_ERR "md: %s: raid array is not clean" | |
1680 | " -- starting background reconstruction\n", | |
1681 | mdname(mddev)); | |
1682 | ||
1da177e4 LT |
1683 | } |
1684 | ||
eae1701f N |
1685 | static ssize_t |
1686 | md_show_level(mddev_t *mddev, char *page) | |
1687 | { | |
1688 | mdk_personality_t *p = mddev->pers; | |
1689 | if (p == NULL) | |
1690 | return 0; | |
1691 | if (mddev->level >= 0) | |
1692 | return sprintf(page, "RAID-%d\n", mddev->level); | |
1693 | else | |
1694 | return sprintf(page, "%s\n", p->name); | |
1695 | } | |
1696 | ||
1697 | static struct md_sysfs_entry md_level = { | |
1698 | .attr = {.name = "level", .mode = S_IRUGO }, | |
1699 | .show = md_show_level, | |
1700 | }; | |
1701 | ||
1702 | static ssize_t | |
1703 | md_show_rdisks(mddev_t *mddev, char *page) | |
1704 | { | |
1705 | return sprintf(page, "%d\n", mddev->raid_disks); | |
1706 | } | |
1707 | ||
1708 | static struct md_sysfs_entry md_raid_disks = { | |
1709 | .attr = {.name = "raid_disks", .mode = S_IRUGO }, | |
1710 | .show = md_show_rdisks, | |
1711 | }; | |
1712 | ||
24dd469d N |
1713 | static ssize_t |
1714 | md_show_scan(mddev_t *mddev, char *page) | |
1715 | { | |
1716 | char *type = "none"; | |
31399d9e N |
1717 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || |
1718 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) { | |
1719 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { | |
24dd469d N |
1720 | if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) |
1721 | type = "resync"; | |
1722 | else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)) | |
1723 | type = "check"; | |
1724 | else | |
1725 | type = "repair"; | |
1726 | } else | |
1727 | type = "recover"; | |
1728 | } | |
1729 | return sprintf(page, "%s\n", type); | |
1730 | } | |
1731 | ||
1732 | static ssize_t | |
1733 | md_store_scan(mddev_t *mddev, const char *page, size_t len) | |
1734 | { | |
1735 | int canscan=0; | |
31399d9e N |
1736 | |
1737 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) || | |
1738 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) | |
24dd469d N |
1739 | return -EBUSY; |
1740 | down(&mddev->reconfig_sem); | |
1741 | if (mddev->pers && mddev->pers->sync_request) | |
1742 | canscan=1; | |
1743 | up(&mddev->reconfig_sem); | |
1744 | if (!canscan) | |
1745 | return -EINVAL; | |
1746 | ||
1747 | if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0) | |
1748 | set_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
1749 | else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0) | |
1750 | return -EINVAL; | |
1751 | set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery); | |
1752 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
1753 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
1754 | md_wakeup_thread(mddev->thread); | |
1755 | return len; | |
1756 | } | |
1757 | ||
9d88883e N |
1758 | static ssize_t |
1759 | md_show_mismatch(mddev_t *mddev, char *page) | |
1760 | { | |
1761 | return sprintf(page, "%llu\n", | |
1762 | (unsigned long long) mddev->resync_mismatches); | |
1763 | } | |
1764 | ||
24dd469d N |
1765 | static struct md_sysfs_entry md_scan_mode = { |
1766 | .attr = {.name = "scan_mode", .mode = S_IRUGO|S_IWUSR }, | |
1767 | .show = md_show_scan, | |
1768 | .store = md_store_scan, | |
1769 | }; | |
1770 | ||
9d88883e N |
1771 | static struct md_sysfs_entry md_mismatches = { |
1772 | .attr = {.name = "mismatch_cnt", .mode = S_IRUGO }, | |
1773 | .show = md_show_mismatch, | |
1774 | }; | |
1775 | ||
eae1701f N |
1776 | static struct attribute *md_default_attrs[] = { |
1777 | &md_level.attr, | |
1778 | &md_raid_disks.attr, | |
24dd469d | 1779 | &md_scan_mode.attr, |
9d88883e | 1780 | &md_mismatches.attr, |
eae1701f N |
1781 | NULL, |
1782 | }; | |
1783 | ||
1784 | static ssize_t | |
1785 | md_attr_show(struct kobject *kobj, struct attribute *attr, char *page) | |
1786 | { | |
1787 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
1788 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
1789 | ||
1790 | if (!entry->show) | |
1791 | return -EIO; | |
1792 | return entry->show(mddev, page); | |
1793 | } | |
1794 | ||
1795 | static ssize_t | |
1796 | md_attr_store(struct kobject *kobj, struct attribute *attr, | |
1797 | const char *page, size_t length) | |
1798 | { | |
1799 | struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr); | |
1800 | mddev_t *mddev = container_of(kobj, struct mddev_s, kobj); | |
1801 | ||
1802 | if (!entry->store) | |
1803 | return -EIO; | |
1804 | return entry->store(mddev, page, length); | |
1805 | } | |
1806 | ||
1807 | static void md_free(struct kobject *ko) | |
1808 | { | |
1809 | mddev_t *mddev = container_of(ko, mddev_t, kobj); | |
1810 | kfree(mddev); | |
1811 | } | |
1812 | ||
1813 | static struct sysfs_ops md_sysfs_ops = { | |
1814 | .show = md_attr_show, | |
1815 | .store = md_attr_store, | |
1816 | }; | |
1817 | static struct kobj_type md_ktype = { | |
1818 | .release = md_free, | |
1819 | .sysfs_ops = &md_sysfs_ops, | |
1820 | .default_attrs = md_default_attrs, | |
1821 | }; | |
1822 | ||
1da177e4 LT |
1823 | int mdp_major = 0; |
1824 | ||
1825 | static struct kobject *md_probe(dev_t dev, int *part, void *data) | |
1826 | { | |
1827 | static DECLARE_MUTEX(disks_sem); | |
1828 | mddev_t *mddev = mddev_find(dev); | |
1829 | struct gendisk *disk; | |
1830 | int partitioned = (MAJOR(dev) != MD_MAJOR); | |
1831 | int shift = partitioned ? MdpMinorShift : 0; | |
1832 | int unit = MINOR(dev) >> shift; | |
1833 | ||
1834 | if (!mddev) | |
1835 | return NULL; | |
1836 | ||
1837 | down(&disks_sem); | |
1838 | if (mddev->gendisk) { | |
1839 | up(&disks_sem); | |
1840 | mddev_put(mddev); | |
1841 | return NULL; | |
1842 | } | |
1843 | disk = alloc_disk(1 << shift); | |
1844 | if (!disk) { | |
1845 | up(&disks_sem); | |
1846 | mddev_put(mddev); | |
1847 | return NULL; | |
1848 | } | |
1849 | disk->major = MAJOR(dev); | |
1850 | disk->first_minor = unit << shift; | |
1851 | if (partitioned) { | |
1852 | sprintf(disk->disk_name, "md_d%d", unit); | |
1853 | sprintf(disk->devfs_name, "md/d%d", unit); | |
1854 | } else { | |
1855 | sprintf(disk->disk_name, "md%d", unit); | |
1856 | sprintf(disk->devfs_name, "md/%d", unit); | |
1857 | } | |
1858 | disk->fops = &md_fops; | |
1859 | disk->private_data = mddev; | |
1860 | disk->queue = mddev->queue; | |
1861 | add_disk(disk); | |
1862 | mddev->gendisk = disk; | |
1863 | up(&disks_sem); | |
9c791977 | 1864 | mddev->kobj.parent = &disk->kobj; |
eae1701f N |
1865 | mddev->kobj.k_name = NULL; |
1866 | snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md"); | |
1867 | mddev->kobj.ktype = &md_ktype; | |
1868 | kobject_register(&mddev->kobj); | |
1da177e4 LT |
1869 | return NULL; |
1870 | } | |
1871 | ||
1872 | void md_wakeup_thread(mdk_thread_t *thread); | |
1873 | ||
1874 | static void md_safemode_timeout(unsigned long data) | |
1875 | { | |
1876 | mddev_t *mddev = (mddev_t *) data; | |
1877 | ||
1878 | mddev->safemode = 1; | |
1879 | md_wakeup_thread(mddev->thread); | |
1880 | } | |
1881 | ||
1882 | ||
1883 | static int do_md_run(mddev_t * mddev) | |
1884 | { | |
1885 | int pnum, err; | |
1886 | int chunk_size; | |
1887 | struct list_head *tmp; | |
1888 | mdk_rdev_t *rdev; | |
1889 | struct gendisk *disk; | |
1890 | char b[BDEVNAME_SIZE]; | |
1891 | ||
a757e64c N |
1892 | if (list_empty(&mddev->disks)) |
1893 | /* cannot run an array with no devices.. */ | |
1da177e4 | 1894 | return -EINVAL; |
1da177e4 LT |
1895 | |
1896 | if (mddev->pers) | |
1897 | return -EBUSY; | |
1898 | ||
1899 | /* | |
1900 | * Analyze all RAID superblock(s) | |
1901 | */ | |
a757e64c N |
1902 | if (!mddev->raid_disks) |
1903 | analyze_sbs(mddev); | |
1da177e4 LT |
1904 | |
1905 | chunk_size = mddev->chunk_size; | |
1906 | pnum = level_to_pers(mddev->level); | |
1907 | ||
1908 | if ((pnum != MULTIPATH) && (pnum != RAID1)) { | |
1909 | if (!chunk_size) { | |
1910 | /* | |
1911 | * 'default chunksize' in the old md code used to | |
1912 | * be PAGE_SIZE, baaad. | |
1913 | * we abort here to be on the safe side. We don't | |
1914 | * want to continue the bad practice. | |
1915 | */ | |
1916 | printk(KERN_ERR | |
1917 | "no chunksize specified, see 'man raidtab'\n"); | |
1918 | return -EINVAL; | |
1919 | } | |
1920 | if (chunk_size > MAX_CHUNK_SIZE) { | |
1921 | printk(KERN_ERR "too big chunk_size: %d > %d\n", | |
1922 | chunk_size, MAX_CHUNK_SIZE); | |
1923 | return -EINVAL; | |
1924 | } | |
1925 | /* | |
1926 | * chunk-size has to be a power of 2 and multiples of PAGE_SIZE | |
1927 | */ | |
1928 | if ( (1 << ffz(~chunk_size)) != chunk_size) { | |
a757e64c | 1929 | printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size); |
1da177e4 LT |
1930 | return -EINVAL; |
1931 | } | |
1932 | if (chunk_size < PAGE_SIZE) { | |
1933 | printk(KERN_ERR "too small chunk_size: %d < %ld\n", | |
1934 | chunk_size, PAGE_SIZE); | |
1935 | return -EINVAL; | |
1936 | } | |
1937 | ||
1938 | /* devices must have minimum size of one chunk */ | |
1939 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 1940 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1941 | continue; |
1942 | if (rdev->size < chunk_size / 1024) { | |
1943 | printk(KERN_WARNING | |
1944 | "md: Dev %s smaller than chunk_size:" | |
1945 | " %lluk < %dk\n", | |
1946 | bdevname(rdev->bdev,b), | |
1947 | (unsigned long long)rdev->size, | |
1948 | chunk_size / 1024); | |
1949 | return -EINVAL; | |
1950 | } | |
1951 | } | |
1952 | } | |
1953 | ||
1da177e4 LT |
1954 | #ifdef CONFIG_KMOD |
1955 | if (!pers[pnum]) | |
1956 | { | |
1957 | request_module("md-personality-%d", pnum); | |
1958 | } | |
1959 | #endif | |
1960 | ||
1961 | /* | |
1962 | * Drop all container device buffers, from now on | |
1963 | * the only valid external interface is through the md | |
1964 | * device. | |
1965 | * Also find largest hardsector size | |
1966 | */ | |
1967 | ITERATE_RDEV(mddev,rdev,tmp) { | |
b2d444d7 | 1968 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
1969 | continue; |
1970 | sync_blockdev(rdev->bdev); | |
1971 | invalidate_bdev(rdev->bdev, 0); | |
1972 | } | |
1973 | ||
1974 | md_probe(mddev->unit, NULL, NULL); | |
1975 | disk = mddev->gendisk; | |
1976 | if (!disk) | |
1977 | return -ENOMEM; | |
1978 | ||
1979 | spin_lock(&pers_lock); | |
1980 | if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) { | |
1981 | spin_unlock(&pers_lock); | |
1982 | printk(KERN_WARNING "md: personality %d is not loaded!\n", | |
1983 | pnum); | |
1984 | return -EINVAL; | |
1985 | } | |
1986 | ||
1987 | mddev->pers = pers[pnum]; | |
1988 | spin_unlock(&pers_lock); | |
1989 | ||
657390d2 | 1990 | mddev->recovery = 0; |
1da177e4 LT |
1991 | mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */ |
1992 | ||
32a7627c N |
1993 | /* before we start the array running, initialise the bitmap */ |
1994 | err = bitmap_create(mddev); | |
1995 | if (err) | |
1996 | printk(KERN_ERR "%s: failed to create bitmap (%d)\n", | |
1997 | mdname(mddev), err); | |
1998 | else | |
1999 | err = mddev->pers->run(mddev); | |
1da177e4 LT |
2000 | if (err) { |
2001 | printk(KERN_ERR "md: pers->run() failed ...\n"); | |
2002 | module_put(mddev->pers->owner); | |
2003 | mddev->pers = NULL; | |
32a7627c N |
2004 | bitmap_destroy(mddev); |
2005 | return err; | |
1da177e4 LT |
2006 | } |
2007 | atomic_set(&mddev->writes_pending,0); | |
2008 | mddev->safemode = 0; | |
2009 | mddev->safemode_timer.function = md_safemode_timeout; | |
2010 | mddev->safemode_timer.data = (unsigned long) mddev; | |
2011 | mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */ | |
2012 | mddev->in_sync = 1; | |
86e6ffdd N |
2013 | |
2014 | ITERATE_RDEV(mddev,rdev,tmp) | |
2015 | if (rdev->raid_disk >= 0) { | |
2016 | char nm[20]; | |
2017 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2018 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
2019 | } | |
1da177e4 LT |
2020 | |
2021 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2022 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2023 | |
2024 | if (mddev->sb_dirty) | |
2025 | md_update_sb(mddev); | |
2026 | ||
2027 | set_capacity(disk, mddev->array_size<<1); | |
2028 | ||
2029 | /* If we call blk_queue_make_request here, it will | |
2030 | * re-initialise max_sectors etc which may have been | |
2031 | * refined inside -> run. So just set the bits we need to set. | |
2032 | * Most initialisation happended when we called | |
2033 | * blk_queue_make_request(..., md_fail_request) | |
2034 | * earlier. | |
2035 | */ | |
2036 | mddev->queue->queuedata = mddev; | |
2037 | mddev->queue->make_request_fn = mddev->pers->make_request; | |
2038 | ||
2039 | mddev->changed = 1; | |
2040 | return 0; | |
2041 | } | |
2042 | ||
2043 | static int restart_array(mddev_t *mddev) | |
2044 | { | |
2045 | struct gendisk *disk = mddev->gendisk; | |
2046 | int err; | |
2047 | ||
2048 | /* | |
2049 | * Complain if it has no devices | |
2050 | */ | |
2051 | err = -ENXIO; | |
2052 | if (list_empty(&mddev->disks)) | |
2053 | goto out; | |
2054 | ||
2055 | if (mddev->pers) { | |
2056 | err = -EBUSY; | |
2057 | if (!mddev->ro) | |
2058 | goto out; | |
2059 | ||
2060 | mddev->safemode = 0; | |
2061 | mddev->ro = 0; | |
2062 | set_disk_ro(disk, 0); | |
2063 | ||
2064 | printk(KERN_INFO "md: %s switched to read-write mode.\n", | |
2065 | mdname(mddev)); | |
2066 | /* | |
2067 | * Kick recovery or resync if necessary | |
2068 | */ | |
2069 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2070 | md_wakeup_thread(mddev->thread); | |
2071 | err = 0; | |
2072 | } else { | |
2073 | printk(KERN_ERR "md: %s has no personality assigned.\n", | |
2074 | mdname(mddev)); | |
2075 | err = -EINVAL; | |
2076 | } | |
2077 | ||
2078 | out: | |
2079 | return err; | |
2080 | } | |
2081 | ||
2082 | static int do_md_stop(mddev_t * mddev, int ro) | |
2083 | { | |
2084 | int err = 0; | |
2085 | struct gendisk *disk = mddev->gendisk; | |
2086 | ||
2087 | if (mddev->pers) { | |
2088 | if (atomic_read(&mddev->active)>2) { | |
2089 | printk("md: %s still in use.\n",mdname(mddev)); | |
2090 | return -EBUSY; | |
2091 | } | |
2092 | ||
2093 | if (mddev->sync_thread) { | |
2094 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
2095 | md_unregister_thread(mddev->sync_thread); | |
2096 | mddev->sync_thread = NULL; | |
2097 | } | |
2098 | ||
2099 | del_timer_sync(&mddev->safemode_timer); | |
2100 | ||
2101 | invalidate_partition(disk, 0); | |
2102 | ||
2103 | if (ro) { | |
2104 | err = -ENXIO; | |
2105 | if (mddev->ro) | |
2106 | goto out; | |
2107 | mddev->ro = 1; | |
2108 | } else { | |
6b8b3e8a N |
2109 | bitmap_flush(mddev); |
2110 | wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0); | |
1da177e4 LT |
2111 | if (mddev->ro) |
2112 | set_disk_ro(disk, 0); | |
2113 | blk_queue_make_request(mddev->queue, md_fail_request); | |
2114 | mddev->pers->stop(mddev); | |
2115 | module_put(mddev->pers->owner); | |
2116 | mddev->pers = NULL; | |
2117 | if (mddev->ro) | |
2118 | mddev->ro = 0; | |
2119 | } | |
2120 | if (!mddev->in_sync) { | |
2121 | /* mark array as shutdown cleanly */ | |
2122 | mddev->in_sync = 1; | |
2123 | md_update_sb(mddev); | |
2124 | } | |
2125 | if (ro) | |
2126 | set_disk_ro(disk, 1); | |
2127 | } | |
32a7627c N |
2128 | |
2129 | bitmap_destroy(mddev); | |
2130 | if (mddev->bitmap_file) { | |
2131 | atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1); | |
2132 | fput(mddev->bitmap_file); | |
2133 | mddev->bitmap_file = NULL; | |
2134 | } | |
9223214e | 2135 | mddev->bitmap_offset = 0; |
32a7627c | 2136 | |
1da177e4 LT |
2137 | /* |
2138 | * Free resources if final stop | |
2139 | */ | |
2140 | if (!ro) { | |
86e6ffdd N |
2141 | mdk_rdev_t *rdev; |
2142 | struct list_head *tmp; | |
1da177e4 LT |
2143 | struct gendisk *disk; |
2144 | printk(KERN_INFO "md: %s stopped.\n", mdname(mddev)); | |
2145 | ||
86e6ffdd N |
2146 | ITERATE_RDEV(mddev,rdev,tmp) |
2147 | if (rdev->raid_disk >= 0) { | |
2148 | char nm[20]; | |
2149 | sprintf(nm, "rd%d", rdev->raid_disk); | |
2150 | sysfs_remove_link(&mddev->kobj, nm); | |
2151 | } | |
2152 | ||
1da177e4 LT |
2153 | export_array(mddev); |
2154 | ||
2155 | mddev->array_size = 0; | |
2156 | disk = mddev->gendisk; | |
2157 | if (disk) | |
2158 | set_capacity(disk, 0); | |
2159 | mddev->changed = 1; | |
2160 | } else | |
2161 | printk(KERN_INFO "md: %s switched to read-only mode.\n", | |
2162 | mdname(mddev)); | |
2163 | err = 0; | |
2164 | out: | |
2165 | return err; | |
2166 | } | |
2167 | ||
2168 | static void autorun_array(mddev_t *mddev) | |
2169 | { | |
2170 | mdk_rdev_t *rdev; | |
2171 | struct list_head *tmp; | |
2172 | int err; | |
2173 | ||
a757e64c | 2174 | if (list_empty(&mddev->disks)) |
1da177e4 | 2175 | return; |
1da177e4 LT |
2176 | |
2177 | printk(KERN_INFO "md: running: "); | |
2178 | ||
2179 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2180 | char b[BDEVNAME_SIZE]; | |
2181 | printk("<%s>", bdevname(rdev->bdev,b)); | |
2182 | } | |
2183 | printk("\n"); | |
2184 | ||
2185 | err = do_md_run (mddev); | |
2186 | if (err) { | |
2187 | printk(KERN_WARNING "md: do_md_run() returned %d\n", err); | |
2188 | do_md_stop (mddev, 0); | |
2189 | } | |
2190 | } | |
2191 | ||
2192 | /* | |
2193 | * lets try to run arrays based on all disks that have arrived | |
2194 | * until now. (those are in pending_raid_disks) | |
2195 | * | |
2196 | * the method: pick the first pending disk, collect all disks with | |
2197 | * the same UUID, remove all from the pending list and put them into | |
2198 | * the 'same_array' list. Then order this list based on superblock | |
2199 | * update time (freshest comes first), kick out 'old' disks and | |
2200 | * compare superblocks. If everything's fine then run it. | |
2201 | * | |
2202 | * If "unit" is allocated, then bump its reference count | |
2203 | */ | |
2204 | static void autorun_devices(int part) | |
2205 | { | |
2206 | struct list_head candidates; | |
2207 | struct list_head *tmp; | |
2208 | mdk_rdev_t *rdev0, *rdev; | |
2209 | mddev_t *mddev; | |
2210 | char b[BDEVNAME_SIZE]; | |
2211 | ||
2212 | printk(KERN_INFO "md: autorun ...\n"); | |
2213 | while (!list_empty(&pending_raid_disks)) { | |
2214 | dev_t dev; | |
2215 | rdev0 = list_entry(pending_raid_disks.next, | |
2216 | mdk_rdev_t, same_set); | |
2217 | ||
2218 | printk(KERN_INFO "md: considering %s ...\n", | |
2219 | bdevname(rdev0->bdev,b)); | |
2220 | INIT_LIST_HEAD(&candidates); | |
2221 | ITERATE_RDEV_PENDING(rdev,tmp) | |
2222 | if (super_90_load(rdev, rdev0, 0) >= 0) { | |
2223 | printk(KERN_INFO "md: adding %s ...\n", | |
2224 | bdevname(rdev->bdev,b)); | |
2225 | list_move(&rdev->same_set, &candidates); | |
2226 | } | |
2227 | /* | |
2228 | * now we have a set of devices, with all of them having | |
2229 | * mostly sane superblocks. It's time to allocate the | |
2230 | * mddev. | |
2231 | */ | |
2232 | if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) { | |
2233 | printk(KERN_INFO "md: unit number in %s is bad: %d\n", | |
2234 | bdevname(rdev0->bdev, b), rdev0->preferred_minor); | |
2235 | break; | |
2236 | } | |
2237 | if (part) | |
2238 | dev = MKDEV(mdp_major, | |
2239 | rdev0->preferred_minor << MdpMinorShift); | |
2240 | else | |
2241 | dev = MKDEV(MD_MAJOR, rdev0->preferred_minor); | |
2242 | ||
2243 | md_probe(dev, NULL, NULL); | |
2244 | mddev = mddev_find(dev); | |
2245 | if (!mddev) { | |
2246 | printk(KERN_ERR | |
2247 | "md: cannot allocate memory for md drive.\n"); | |
2248 | break; | |
2249 | } | |
2250 | if (mddev_lock(mddev)) | |
2251 | printk(KERN_WARNING "md: %s locked, cannot run\n", | |
2252 | mdname(mddev)); | |
2253 | else if (mddev->raid_disks || mddev->major_version | |
2254 | || !list_empty(&mddev->disks)) { | |
2255 | printk(KERN_WARNING | |
2256 | "md: %s already running, cannot run %s\n", | |
2257 | mdname(mddev), bdevname(rdev0->bdev,b)); | |
2258 | mddev_unlock(mddev); | |
2259 | } else { | |
2260 | printk(KERN_INFO "md: created %s\n", mdname(mddev)); | |
2261 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) { | |
2262 | list_del_init(&rdev->same_set); | |
2263 | if (bind_rdev_to_array(rdev, mddev)) | |
2264 | export_rdev(rdev); | |
2265 | } | |
2266 | autorun_array(mddev); | |
2267 | mddev_unlock(mddev); | |
2268 | } | |
2269 | /* on success, candidates will be empty, on error | |
2270 | * it won't... | |
2271 | */ | |
2272 | ITERATE_RDEV_GENERIC(candidates,rdev,tmp) | |
2273 | export_rdev(rdev); | |
2274 | mddev_put(mddev); | |
2275 | } | |
2276 | printk(KERN_INFO "md: ... autorun DONE.\n"); | |
2277 | } | |
2278 | ||
2279 | /* | |
2280 | * import RAID devices based on one partition | |
2281 | * if possible, the array gets run as well. | |
2282 | */ | |
2283 | ||
2284 | static int autostart_array(dev_t startdev) | |
2285 | { | |
2286 | char b[BDEVNAME_SIZE]; | |
2287 | int err = -EINVAL, i; | |
2288 | mdp_super_t *sb = NULL; | |
2289 | mdk_rdev_t *start_rdev = NULL, *rdev; | |
2290 | ||
2291 | start_rdev = md_import_device(startdev, 0, 0); | |
2292 | if (IS_ERR(start_rdev)) | |
2293 | return err; | |
2294 | ||
2295 | ||
2296 | /* NOTE: this can only work for 0.90.0 superblocks */ | |
2297 | sb = (mdp_super_t*)page_address(start_rdev->sb_page); | |
2298 | if (sb->major_version != 0 || | |
2299 | sb->minor_version != 90 ) { | |
2300 | printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n"); | |
2301 | export_rdev(start_rdev); | |
2302 | return err; | |
2303 | } | |
2304 | ||
b2d444d7 | 2305 | if (test_bit(Faulty, &start_rdev->flags)) { |
1da177e4 LT |
2306 | printk(KERN_WARNING |
2307 | "md: can not autostart based on faulty %s!\n", | |
2308 | bdevname(start_rdev->bdev,b)); | |
2309 | export_rdev(start_rdev); | |
2310 | return err; | |
2311 | } | |
2312 | list_add(&start_rdev->same_set, &pending_raid_disks); | |
2313 | ||
2314 | for (i = 0; i < MD_SB_DISKS; i++) { | |
2315 | mdp_disk_t *desc = sb->disks + i; | |
2316 | dev_t dev = MKDEV(desc->major, desc->minor); | |
2317 | ||
2318 | if (!dev) | |
2319 | continue; | |
2320 | if (dev == startdev) | |
2321 | continue; | |
2322 | if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor) | |
2323 | continue; | |
2324 | rdev = md_import_device(dev, 0, 0); | |
2325 | if (IS_ERR(rdev)) | |
2326 | continue; | |
2327 | ||
2328 | list_add(&rdev->same_set, &pending_raid_disks); | |
2329 | } | |
2330 | ||
2331 | /* | |
2332 | * possibly return codes | |
2333 | */ | |
2334 | autorun_devices(0); | |
2335 | return 0; | |
2336 | ||
2337 | } | |
2338 | ||
2339 | ||
2340 | static int get_version(void __user * arg) | |
2341 | { | |
2342 | mdu_version_t ver; | |
2343 | ||
2344 | ver.major = MD_MAJOR_VERSION; | |
2345 | ver.minor = MD_MINOR_VERSION; | |
2346 | ver.patchlevel = MD_PATCHLEVEL_VERSION; | |
2347 | ||
2348 | if (copy_to_user(arg, &ver, sizeof(ver))) | |
2349 | return -EFAULT; | |
2350 | ||
2351 | return 0; | |
2352 | } | |
2353 | ||
2354 | static int get_array_info(mddev_t * mddev, void __user * arg) | |
2355 | { | |
2356 | mdu_array_info_t info; | |
2357 | int nr,working,active,failed,spare; | |
2358 | mdk_rdev_t *rdev; | |
2359 | struct list_head *tmp; | |
2360 | ||
2361 | nr=working=active=failed=spare=0; | |
2362 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2363 | nr++; | |
b2d444d7 | 2364 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 LT |
2365 | failed++; |
2366 | else { | |
2367 | working++; | |
b2d444d7 | 2368 | if (test_bit(In_sync, &rdev->flags)) |
1da177e4 LT |
2369 | active++; |
2370 | else | |
2371 | spare++; | |
2372 | } | |
2373 | } | |
2374 | ||
2375 | info.major_version = mddev->major_version; | |
2376 | info.minor_version = mddev->minor_version; | |
2377 | info.patch_version = MD_PATCHLEVEL_VERSION; | |
2378 | info.ctime = mddev->ctime; | |
2379 | info.level = mddev->level; | |
2380 | info.size = mddev->size; | |
2381 | info.nr_disks = nr; | |
2382 | info.raid_disks = mddev->raid_disks; | |
2383 | info.md_minor = mddev->md_minor; | |
2384 | info.not_persistent= !mddev->persistent; | |
2385 | ||
2386 | info.utime = mddev->utime; | |
2387 | info.state = 0; | |
2388 | if (mddev->in_sync) | |
2389 | info.state = (1<<MD_SB_CLEAN); | |
36fa3063 N |
2390 | if (mddev->bitmap && mddev->bitmap_offset) |
2391 | info.state = (1<<MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
2392 | info.active_disks = active; |
2393 | info.working_disks = working; | |
2394 | info.failed_disks = failed; | |
2395 | info.spare_disks = spare; | |
2396 | ||
2397 | info.layout = mddev->layout; | |
2398 | info.chunk_size = mddev->chunk_size; | |
2399 | ||
2400 | if (copy_to_user(arg, &info, sizeof(info))) | |
2401 | return -EFAULT; | |
2402 | ||
2403 | return 0; | |
2404 | } | |
2405 | ||
87162a28 | 2406 | static int get_bitmap_file(mddev_t * mddev, void __user * arg) |
32a7627c N |
2407 | { |
2408 | mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */ | |
2409 | char *ptr, *buf = NULL; | |
2410 | int err = -ENOMEM; | |
2411 | ||
2412 | file = kmalloc(sizeof(*file), GFP_KERNEL); | |
2413 | if (!file) | |
2414 | goto out; | |
2415 | ||
2416 | /* bitmap disabled, zero the first byte and copy out */ | |
2417 | if (!mddev->bitmap || !mddev->bitmap->file) { | |
2418 | file->pathname[0] = '\0'; | |
2419 | goto copy_out; | |
2420 | } | |
2421 | ||
2422 | buf = kmalloc(sizeof(file->pathname), GFP_KERNEL); | |
2423 | if (!buf) | |
2424 | goto out; | |
2425 | ||
2426 | ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname)); | |
2427 | if (!ptr) | |
2428 | goto out; | |
2429 | ||
2430 | strcpy(file->pathname, ptr); | |
2431 | ||
2432 | copy_out: | |
2433 | err = 0; | |
2434 | if (copy_to_user(arg, file, sizeof(*file))) | |
2435 | err = -EFAULT; | |
2436 | out: | |
2437 | kfree(buf); | |
2438 | kfree(file); | |
2439 | return err; | |
2440 | } | |
2441 | ||
1da177e4 LT |
2442 | static int get_disk_info(mddev_t * mddev, void __user * arg) |
2443 | { | |
2444 | mdu_disk_info_t info; | |
2445 | unsigned int nr; | |
2446 | mdk_rdev_t *rdev; | |
2447 | ||
2448 | if (copy_from_user(&info, arg, sizeof(info))) | |
2449 | return -EFAULT; | |
2450 | ||
2451 | nr = info.number; | |
2452 | ||
2453 | rdev = find_rdev_nr(mddev, nr); | |
2454 | if (rdev) { | |
2455 | info.major = MAJOR(rdev->bdev->bd_dev); | |
2456 | info.minor = MINOR(rdev->bdev->bd_dev); | |
2457 | info.raid_disk = rdev->raid_disk; | |
2458 | info.state = 0; | |
b2d444d7 | 2459 | if (test_bit(Faulty, &rdev->flags)) |
1da177e4 | 2460 | info.state |= (1<<MD_DISK_FAULTY); |
b2d444d7 | 2461 | else if (test_bit(In_sync, &rdev->flags)) { |
1da177e4 LT |
2462 | info.state |= (1<<MD_DISK_ACTIVE); |
2463 | info.state |= (1<<MD_DISK_SYNC); | |
2464 | } | |
8ddf9efe N |
2465 | if (test_bit(WriteMostly, &rdev->flags)) |
2466 | info.state |= (1<<MD_DISK_WRITEMOSTLY); | |
1da177e4 LT |
2467 | } else { |
2468 | info.major = info.minor = 0; | |
2469 | info.raid_disk = -1; | |
2470 | info.state = (1<<MD_DISK_REMOVED); | |
2471 | } | |
2472 | ||
2473 | if (copy_to_user(arg, &info, sizeof(info))) | |
2474 | return -EFAULT; | |
2475 | ||
2476 | return 0; | |
2477 | } | |
2478 | ||
2479 | static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info) | |
2480 | { | |
2481 | char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE]; | |
2482 | mdk_rdev_t *rdev; | |
2483 | dev_t dev = MKDEV(info->major,info->minor); | |
2484 | ||
2485 | if (info->major != MAJOR(dev) || info->minor != MINOR(dev)) | |
2486 | return -EOVERFLOW; | |
2487 | ||
2488 | if (!mddev->raid_disks) { | |
2489 | int err; | |
2490 | /* expecting a device which has a superblock */ | |
2491 | rdev = md_import_device(dev, mddev->major_version, mddev->minor_version); | |
2492 | if (IS_ERR(rdev)) { | |
2493 | printk(KERN_WARNING | |
2494 | "md: md_import_device returned %ld\n", | |
2495 | PTR_ERR(rdev)); | |
2496 | return PTR_ERR(rdev); | |
2497 | } | |
2498 | if (!list_empty(&mddev->disks)) { | |
2499 | mdk_rdev_t *rdev0 = list_entry(mddev->disks.next, | |
2500 | mdk_rdev_t, same_set); | |
2501 | int err = super_types[mddev->major_version] | |
2502 | .load_super(rdev, rdev0, mddev->minor_version); | |
2503 | if (err < 0) { | |
2504 | printk(KERN_WARNING | |
2505 | "md: %s has different UUID to %s\n", | |
2506 | bdevname(rdev->bdev,b), | |
2507 | bdevname(rdev0->bdev,b2)); | |
2508 | export_rdev(rdev); | |
2509 | return -EINVAL; | |
2510 | } | |
2511 | } | |
2512 | err = bind_rdev_to_array(rdev, mddev); | |
2513 | if (err) | |
2514 | export_rdev(rdev); | |
2515 | return err; | |
2516 | } | |
2517 | ||
2518 | /* | |
2519 | * add_new_disk can be used once the array is assembled | |
2520 | * to add "hot spares". They must already have a superblock | |
2521 | * written | |
2522 | */ | |
2523 | if (mddev->pers) { | |
2524 | int err; | |
2525 | if (!mddev->pers->hot_add_disk) { | |
2526 | printk(KERN_WARNING | |
2527 | "%s: personality does not support diskops!\n", | |
2528 | mdname(mddev)); | |
2529 | return -EINVAL; | |
2530 | } | |
7b1e35f6 N |
2531 | if (mddev->persistent) |
2532 | rdev = md_import_device(dev, mddev->major_version, | |
2533 | mddev->minor_version); | |
2534 | else | |
2535 | rdev = md_import_device(dev, -1, -1); | |
1da177e4 LT |
2536 | if (IS_ERR(rdev)) { |
2537 | printk(KERN_WARNING | |
2538 | "md: md_import_device returned %ld\n", | |
2539 | PTR_ERR(rdev)); | |
2540 | return PTR_ERR(rdev); | |
2541 | } | |
41158c7e N |
2542 | /* set save_raid_disk if appropriate */ |
2543 | if (!mddev->persistent) { | |
2544 | if (info->state & (1<<MD_DISK_SYNC) && | |
2545 | info->raid_disk < mddev->raid_disks) | |
2546 | rdev->raid_disk = info->raid_disk; | |
2547 | else | |
2548 | rdev->raid_disk = -1; | |
2549 | } else | |
2550 | super_types[mddev->major_version]. | |
2551 | validate_super(mddev, rdev); | |
2552 | rdev->saved_raid_disk = rdev->raid_disk; | |
2553 | ||
b2d444d7 | 2554 | clear_bit(In_sync, &rdev->flags); /* just to be sure */ |
8ddf9efe N |
2555 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
2556 | set_bit(WriteMostly, &rdev->flags); | |
2557 | ||
1da177e4 LT |
2558 | rdev->raid_disk = -1; |
2559 | err = bind_rdev_to_array(rdev, mddev); | |
2560 | if (err) | |
2561 | export_rdev(rdev); | |
c361777f N |
2562 | |
2563 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
005eca5e | 2564 | md_wakeup_thread(mddev->thread); |
1da177e4 LT |
2565 | return err; |
2566 | } | |
2567 | ||
2568 | /* otherwise, add_new_disk is only allowed | |
2569 | * for major_version==0 superblocks | |
2570 | */ | |
2571 | if (mddev->major_version != 0) { | |
2572 | printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n", | |
2573 | mdname(mddev)); | |
2574 | return -EINVAL; | |
2575 | } | |
2576 | ||
2577 | if (!(info->state & (1<<MD_DISK_FAULTY))) { | |
2578 | int err; | |
2579 | rdev = md_import_device (dev, -1, 0); | |
2580 | if (IS_ERR(rdev)) { | |
2581 | printk(KERN_WARNING | |
2582 | "md: error, md_import_device() returned %ld\n", | |
2583 | PTR_ERR(rdev)); | |
2584 | return PTR_ERR(rdev); | |
2585 | } | |
2586 | rdev->desc_nr = info->number; | |
2587 | if (info->raid_disk < mddev->raid_disks) | |
2588 | rdev->raid_disk = info->raid_disk; | |
2589 | else | |
2590 | rdev->raid_disk = -1; | |
2591 | ||
b2d444d7 N |
2592 | rdev->flags = 0; |
2593 | ||
1da177e4 | 2594 | if (rdev->raid_disk < mddev->raid_disks) |
b2d444d7 N |
2595 | if (info->state & (1<<MD_DISK_SYNC)) |
2596 | set_bit(In_sync, &rdev->flags); | |
1da177e4 | 2597 | |
8ddf9efe N |
2598 | if (info->state & (1<<MD_DISK_WRITEMOSTLY)) |
2599 | set_bit(WriteMostly, &rdev->flags); | |
2600 | ||
1da177e4 LT |
2601 | err = bind_rdev_to_array(rdev, mddev); |
2602 | if (err) { | |
2603 | export_rdev(rdev); | |
2604 | return err; | |
2605 | } | |
2606 | ||
2607 | if (!mddev->persistent) { | |
2608 | printk(KERN_INFO "md: nonpersistent superblock ...\n"); | |
2609 | rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2610 | } else | |
2611 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
2612 | rdev->size = calc_dev_size(rdev, mddev->chunk_size); | |
2613 | ||
2614 | if (!mddev->size || (mddev->size > rdev->size)) | |
2615 | mddev->size = rdev->size; | |
2616 | } | |
2617 | ||
2618 | return 0; | |
2619 | } | |
2620 | ||
2621 | static int hot_remove_disk(mddev_t * mddev, dev_t dev) | |
2622 | { | |
2623 | char b[BDEVNAME_SIZE]; | |
2624 | mdk_rdev_t *rdev; | |
2625 | ||
2626 | if (!mddev->pers) | |
2627 | return -ENODEV; | |
2628 | ||
2629 | rdev = find_rdev(mddev, dev); | |
2630 | if (!rdev) | |
2631 | return -ENXIO; | |
2632 | ||
2633 | if (rdev->raid_disk >= 0) | |
2634 | goto busy; | |
2635 | ||
2636 | kick_rdev_from_array(rdev); | |
2637 | md_update_sb(mddev); | |
2638 | ||
2639 | return 0; | |
2640 | busy: | |
2641 | printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n", | |
2642 | bdevname(rdev->bdev,b), mdname(mddev)); | |
2643 | return -EBUSY; | |
2644 | } | |
2645 | ||
2646 | static int hot_add_disk(mddev_t * mddev, dev_t dev) | |
2647 | { | |
2648 | char b[BDEVNAME_SIZE]; | |
2649 | int err; | |
2650 | unsigned int size; | |
2651 | mdk_rdev_t *rdev; | |
2652 | ||
2653 | if (!mddev->pers) | |
2654 | return -ENODEV; | |
2655 | ||
2656 | if (mddev->major_version != 0) { | |
2657 | printk(KERN_WARNING "%s: HOT_ADD may only be used with" | |
2658 | " version-0 superblocks.\n", | |
2659 | mdname(mddev)); | |
2660 | return -EINVAL; | |
2661 | } | |
2662 | if (!mddev->pers->hot_add_disk) { | |
2663 | printk(KERN_WARNING | |
2664 | "%s: personality does not support diskops!\n", | |
2665 | mdname(mddev)); | |
2666 | return -EINVAL; | |
2667 | } | |
2668 | ||
2669 | rdev = md_import_device (dev, -1, 0); | |
2670 | if (IS_ERR(rdev)) { | |
2671 | printk(KERN_WARNING | |
2672 | "md: error, md_import_device() returned %ld\n", | |
2673 | PTR_ERR(rdev)); | |
2674 | return -EINVAL; | |
2675 | } | |
2676 | ||
2677 | if (mddev->persistent) | |
2678 | rdev->sb_offset = calc_dev_sboffset(rdev->bdev); | |
2679 | else | |
2680 | rdev->sb_offset = | |
2681 | rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS; | |
2682 | ||
2683 | size = calc_dev_size(rdev, mddev->chunk_size); | |
2684 | rdev->size = size; | |
2685 | ||
2686 | if (size < mddev->size) { | |
2687 | printk(KERN_WARNING | |
2688 | "%s: disk size %llu blocks < array size %llu\n", | |
2689 | mdname(mddev), (unsigned long long)size, | |
2690 | (unsigned long long)mddev->size); | |
2691 | err = -ENOSPC; | |
2692 | goto abort_export; | |
2693 | } | |
2694 | ||
b2d444d7 | 2695 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
2696 | printk(KERN_WARNING |
2697 | "md: can not hot-add faulty %s disk to %s!\n", | |
2698 | bdevname(rdev->bdev,b), mdname(mddev)); | |
2699 | err = -EINVAL; | |
2700 | goto abort_export; | |
2701 | } | |
b2d444d7 | 2702 | clear_bit(In_sync, &rdev->flags); |
1da177e4 LT |
2703 | rdev->desc_nr = -1; |
2704 | bind_rdev_to_array(rdev, mddev); | |
2705 | ||
2706 | /* | |
2707 | * The rest should better be atomic, we can have disk failures | |
2708 | * noticed in interrupt contexts ... | |
2709 | */ | |
2710 | ||
2711 | if (rdev->desc_nr == mddev->max_disks) { | |
2712 | printk(KERN_WARNING "%s: can not hot-add to full array!\n", | |
2713 | mdname(mddev)); | |
2714 | err = -EBUSY; | |
2715 | goto abort_unbind_export; | |
2716 | } | |
2717 | ||
2718 | rdev->raid_disk = -1; | |
2719 | ||
2720 | md_update_sb(mddev); | |
2721 | ||
2722 | /* | |
2723 | * Kick recovery, maybe this spare has to be added to the | |
2724 | * array immediately. | |
2725 | */ | |
2726 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
2727 | md_wakeup_thread(mddev->thread); | |
2728 | ||
2729 | return 0; | |
2730 | ||
2731 | abort_unbind_export: | |
2732 | unbind_rdev_from_array(rdev); | |
2733 | ||
2734 | abort_export: | |
2735 | export_rdev(rdev); | |
2736 | return err; | |
2737 | } | |
2738 | ||
32a7627c N |
2739 | /* similar to deny_write_access, but accounts for our holding a reference |
2740 | * to the file ourselves */ | |
2741 | static int deny_bitmap_write_access(struct file * file) | |
2742 | { | |
2743 | struct inode *inode = file->f_mapping->host; | |
2744 | ||
2745 | spin_lock(&inode->i_lock); | |
2746 | if (atomic_read(&inode->i_writecount) > 1) { | |
2747 | spin_unlock(&inode->i_lock); | |
2748 | return -ETXTBSY; | |
2749 | } | |
2750 | atomic_set(&inode->i_writecount, -1); | |
2751 | spin_unlock(&inode->i_lock); | |
2752 | ||
2753 | return 0; | |
2754 | } | |
2755 | ||
2756 | static int set_bitmap_file(mddev_t *mddev, int fd) | |
2757 | { | |
2758 | int err; | |
2759 | ||
36fa3063 N |
2760 | if (mddev->pers) { |
2761 | if (!mddev->pers->quiesce) | |
2762 | return -EBUSY; | |
2763 | if (mddev->recovery || mddev->sync_thread) | |
2764 | return -EBUSY; | |
2765 | /* we should be able to change the bitmap.. */ | |
2766 | } | |
32a7627c | 2767 | |
32a7627c | 2768 | |
36fa3063 N |
2769 | if (fd >= 0) { |
2770 | if (mddev->bitmap) | |
2771 | return -EEXIST; /* cannot add when bitmap is present */ | |
2772 | mddev->bitmap_file = fget(fd); | |
32a7627c | 2773 | |
36fa3063 N |
2774 | if (mddev->bitmap_file == NULL) { |
2775 | printk(KERN_ERR "%s: error: failed to get bitmap file\n", | |
2776 | mdname(mddev)); | |
2777 | return -EBADF; | |
2778 | } | |
2779 | ||
2780 | err = deny_bitmap_write_access(mddev->bitmap_file); | |
2781 | if (err) { | |
2782 | printk(KERN_ERR "%s: error: bitmap file is already in use\n", | |
2783 | mdname(mddev)); | |
2784 | fput(mddev->bitmap_file); | |
2785 | mddev->bitmap_file = NULL; | |
2786 | return err; | |
2787 | } | |
a654b9d8 | 2788 | mddev->bitmap_offset = 0; /* file overrides offset */ |
36fa3063 N |
2789 | } else if (mddev->bitmap == NULL) |
2790 | return -ENOENT; /* cannot remove what isn't there */ | |
2791 | err = 0; | |
2792 | if (mddev->pers) { | |
2793 | mddev->pers->quiesce(mddev, 1); | |
2794 | if (fd >= 0) | |
2795 | err = bitmap_create(mddev); | |
2796 | if (fd < 0 || err) | |
2797 | bitmap_destroy(mddev); | |
2798 | mddev->pers->quiesce(mddev, 0); | |
2799 | } else if (fd < 0) { | |
2800 | if (mddev->bitmap_file) | |
2801 | fput(mddev->bitmap_file); | |
2802 | mddev->bitmap_file = NULL; | |
2803 | } | |
2804 | ||
32a7627c N |
2805 | return err; |
2806 | } | |
2807 | ||
1da177e4 LT |
2808 | /* |
2809 | * set_array_info is used two different ways | |
2810 | * The original usage is when creating a new array. | |
2811 | * In this usage, raid_disks is > 0 and it together with | |
2812 | * level, size, not_persistent,layout,chunksize determine the | |
2813 | * shape of the array. | |
2814 | * This will always create an array with a type-0.90.0 superblock. | |
2815 | * The newer usage is when assembling an array. | |
2816 | * In this case raid_disks will be 0, and the major_version field is | |
2817 | * use to determine which style super-blocks are to be found on the devices. | |
2818 | * The minor and patch _version numbers are also kept incase the | |
2819 | * super_block handler wishes to interpret them. | |
2820 | */ | |
2821 | static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) | |
2822 | { | |
2823 | ||
2824 | if (info->raid_disks == 0) { | |
2825 | /* just setting version number for superblock loading */ | |
2826 | if (info->major_version < 0 || | |
2827 | info->major_version >= sizeof(super_types)/sizeof(super_types[0]) || | |
2828 | super_types[info->major_version].name == NULL) { | |
2829 | /* maybe try to auto-load a module? */ | |
2830 | printk(KERN_INFO | |
2831 | "md: superblock version %d not known\n", | |
2832 | info->major_version); | |
2833 | return -EINVAL; | |
2834 | } | |
2835 | mddev->major_version = info->major_version; | |
2836 | mddev->minor_version = info->minor_version; | |
2837 | mddev->patch_version = info->patch_version; | |
2838 | return 0; | |
2839 | } | |
2840 | mddev->major_version = MD_MAJOR_VERSION; | |
2841 | mddev->minor_version = MD_MINOR_VERSION; | |
2842 | mddev->patch_version = MD_PATCHLEVEL_VERSION; | |
2843 | mddev->ctime = get_seconds(); | |
2844 | ||
2845 | mddev->level = info->level; | |
2846 | mddev->size = info->size; | |
2847 | mddev->raid_disks = info->raid_disks; | |
2848 | /* don't set md_minor, it is determined by which /dev/md* was | |
2849 | * openned | |
2850 | */ | |
2851 | if (info->state & (1<<MD_SB_CLEAN)) | |
2852 | mddev->recovery_cp = MaxSector; | |
2853 | else | |
2854 | mddev->recovery_cp = 0; | |
2855 | mddev->persistent = ! info->not_persistent; | |
2856 | ||
2857 | mddev->layout = info->layout; | |
2858 | mddev->chunk_size = info->chunk_size; | |
2859 | ||
2860 | mddev->max_disks = MD_SB_DISKS; | |
2861 | ||
2862 | mddev->sb_dirty = 1; | |
2863 | ||
2864 | /* | |
2865 | * Generate a 128 bit UUID | |
2866 | */ | |
2867 | get_random_bytes(mddev->uuid, 16); | |
2868 | ||
2869 | return 0; | |
2870 | } | |
2871 | ||
2872 | /* | |
2873 | * update_array_info is used to change the configuration of an | |
2874 | * on-line array. | |
2875 | * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size | |
2876 | * fields in the info are checked against the array. | |
2877 | * Any differences that cannot be handled will cause an error. | |
2878 | * Normally, only one change can be managed at a time. | |
2879 | */ | |
2880 | static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) | |
2881 | { | |
2882 | int rv = 0; | |
2883 | int cnt = 0; | |
36fa3063 N |
2884 | int state = 0; |
2885 | ||
2886 | /* calculate expected state,ignoring low bits */ | |
2887 | if (mddev->bitmap && mddev->bitmap_offset) | |
2888 | state |= (1 << MD_SB_BITMAP_PRESENT); | |
1da177e4 LT |
2889 | |
2890 | if (mddev->major_version != info->major_version || | |
2891 | mddev->minor_version != info->minor_version || | |
2892 | /* mddev->patch_version != info->patch_version || */ | |
2893 | mddev->ctime != info->ctime || | |
2894 | mddev->level != info->level || | |
2895 | /* mddev->layout != info->layout || */ | |
2896 | !mddev->persistent != info->not_persistent|| | |
36fa3063 N |
2897 | mddev->chunk_size != info->chunk_size || |
2898 | /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ | |
2899 | ((state^info->state) & 0xfffffe00) | |
2900 | ) | |
1da177e4 LT |
2901 | return -EINVAL; |
2902 | /* Check there is only one change */ | |
2903 | if (mddev->size != info->size) cnt++; | |
2904 | if (mddev->raid_disks != info->raid_disks) cnt++; | |
2905 | if (mddev->layout != info->layout) cnt++; | |
36fa3063 | 2906 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++; |
1da177e4 LT |
2907 | if (cnt == 0) return 0; |
2908 | if (cnt > 1) return -EINVAL; | |
2909 | ||
2910 | if (mddev->layout != info->layout) { | |
2911 | /* Change layout | |
2912 | * we don't need to do anything at the md level, the | |
2913 | * personality will take care of it all. | |
2914 | */ | |
2915 | if (mddev->pers->reconfig == NULL) | |
2916 | return -EINVAL; | |
2917 | else | |
2918 | return mddev->pers->reconfig(mddev, info->layout, -1); | |
2919 | } | |
2920 | if (mddev->size != info->size) { | |
2921 | mdk_rdev_t * rdev; | |
2922 | struct list_head *tmp; | |
2923 | if (mddev->pers->resize == NULL) | |
2924 | return -EINVAL; | |
2925 | /* The "size" is the amount of each device that is used. | |
2926 | * This can only make sense for arrays with redundancy. | |
2927 | * linear and raid0 always use whatever space is available | |
2928 | * We can only consider changing the size if no resync | |
2929 | * or reconstruction is happening, and if the new size | |
2930 | * is acceptable. It must fit before the sb_offset or, | |
2931 | * if that is <data_offset, it must fit before the | |
2932 | * size of each device. | |
2933 | * If size is zero, we find the largest size that fits. | |
2934 | */ | |
2935 | if (mddev->sync_thread) | |
2936 | return -EBUSY; | |
2937 | ITERATE_RDEV(mddev,rdev,tmp) { | |
2938 | sector_t avail; | |
2939 | int fit = (info->size == 0); | |
2940 | if (rdev->sb_offset > rdev->data_offset) | |
2941 | avail = (rdev->sb_offset*2) - rdev->data_offset; | |
2942 | else | |
2943 | avail = get_capacity(rdev->bdev->bd_disk) | |
2944 | - rdev->data_offset; | |
2945 | if (fit && (info->size == 0 || info->size > avail/2)) | |
2946 | info->size = avail/2; | |
2947 | if (avail < ((sector_t)info->size << 1)) | |
2948 | return -ENOSPC; | |
2949 | } | |
2950 | rv = mddev->pers->resize(mddev, (sector_t)info->size *2); | |
2951 | if (!rv) { | |
2952 | struct block_device *bdev; | |
2953 | ||
2954 | bdev = bdget_disk(mddev->gendisk, 0); | |
2955 | if (bdev) { | |
2956 | down(&bdev->bd_inode->i_sem); | |
2957 | i_size_write(bdev->bd_inode, mddev->array_size << 10); | |
2958 | up(&bdev->bd_inode->i_sem); | |
2959 | bdput(bdev); | |
2960 | } | |
2961 | } | |
2962 | } | |
2963 | if (mddev->raid_disks != info->raid_disks) { | |
2964 | /* change the number of raid disks */ | |
2965 | if (mddev->pers->reshape == NULL) | |
2966 | return -EINVAL; | |
2967 | if (info->raid_disks <= 0 || | |
2968 | info->raid_disks >= mddev->max_disks) | |
2969 | return -EINVAL; | |
2970 | if (mddev->sync_thread) | |
2971 | return -EBUSY; | |
2972 | rv = mddev->pers->reshape(mddev, info->raid_disks); | |
2973 | if (!rv) { | |
2974 | struct block_device *bdev; | |
2975 | ||
2976 | bdev = bdget_disk(mddev->gendisk, 0); | |
2977 | if (bdev) { | |
2978 | down(&bdev->bd_inode->i_sem); | |
2979 | i_size_write(bdev->bd_inode, mddev->array_size << 10); | |
2980 | up(&bdev->bd_inode->i_sem); | |
2981 | bdput(bdev); | |
2982 | } | |
2983 | } | |
2984 | } | |
36fa3063 N |
2985 | if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) { |
2986 | if (mddev->pers->quiesce == NULL) | |
2987 | return -EINVAL; | |
2988 | if (mddev->recovery || mddev->sync_thread) | |
2989 | return -EBUSY; | |
2990 | if (info->state & (1<<MD_SB_BITMAP_PRESENT)) { | |
2991 | /* add the bitmap */ | |
2992 | if (mddev->bitmap) | |
2993 | return -EEXIST; | |
2994 | if (mddev->default_bitmap_offset == 0) | |
2995 | return -EINVAL; | |
2996 | mddev->bitmap_offset = mddev->default_bitmap_offset; | |
2997 | mddev->pers->quiesce(mddev, 1); | |
2998 | rv = bitmap_create(mddev); | |
2999 | if (rv) | |
3000 | bitmap_destroy(mddev); | |
3001 | mddev->pers->quiesce(mddev, 0); | |
3002 | } else { | |
3003 | /* remove the bitmap */ | |
3004 | if (!mddev->bitmap) | |
3005 | return -ENOENT; | |
3006 | if (mddev->bitmap->file) | |
3007 | return -EINVAL; | |
3008 | mddev->pers->quiesce(mddev, 1); | |
3009 | bitmap_destroy(mddev); | |
3010 | mddev->pers->quiesce(mddev, 0); | |
3011 | mddev->bitmap_offset = 0; | |
3012 | } | |
3013 | } | |
1da177e4 LT |
3014 | md_update_sb(mddev); |
3015 | return rv; | |
3016 | } | |
3017 | ||
3018 | static int set_disk_faulty(mddev_t *mddev, dev_t dev) | |
3019 | { | |
3020 | mdk_rdev_t *rdev; | |
3021 | ||
3022 | if (mddev->pers == NULL) | |
3023 | return -ENODEV; | |
3024 | ||
3025 | rdev = find_rdev(mddev, dev); | |
3026 | if (!rdev) | |
3027 | return -ENODEV; | |
3028 | ||
3029 | md_error(mddev, rdev); | |
3030 | return 0; | |
3031 | } | |
3032 | ||
3033 | static int md_ioctl(struct inode *inode, struct file *file, | |
3034 | unsigned int cmd, unsigned long arg) | |
3035 | { | |
3036 | int err = 0; | |
3037 | void __user *argp = (void __user *)arg; | |
3038 | struct hd_geometry __user *loc = argp; | |
3039 | mddev_t *mddev = NULL; | |
3040 | ||
3041 | if (!capable(CAP_SYS_ADMIN)) | |
3042 | return -EACCES; | |
3043 | ||
3044 | /* | |
3045 | * Commands dealing with the RAID driver but not any | |
3046 | * particular array: | |
3047 | */ | |
3048 | switch (cmd) | |
3049 | { | |
3050 | case RAID_VERSION: | |
3051 | err = get_version(argp); | |
3052 | goto done; | |
3053 | ||
3054 | case PRINT_RAID_DEBUG: | |
3055 | err = 0; | |
3056 | md_print_devices(); | |
3057 | goto done; | |
3058 | ||
3059 | #ifndef MODULE | |
3060 | case RAID_AUTORUN: | |
3061 | err = 0; | |
3062 | autostart_arrays(arg); | |
3063 | goto done; | |
3064 | #endif | |
3065 | default:; | |
3066 | } | |
3067 | ||
3068 | /* | |
3069 | * Commands creating/starting a new array: | |
3070 | */ | |
3071 | ||
3072 | mddev = inode->i_bdev->bd_disk->private_data; | |
3073 | ||
3074 | if (!mddev) { | |
3075 | BUG(); | |
3076 | goto abort; | |
3077 | } | |
3078 | ||
3079 | ||
3080 | if (cmd == START_ARRAY) { | |
3081 | /* START_ARRAY doesn't need to lock the array as autostart_array | |
3082 | * does the locking, and it could even be a different array | |
3083 | */ | |
3084 | static int cnt = 3; | |
3085 | if (cnt > 0 ) { | |
3086 | printk(KERN_WARNING | |
3087 | "md: %s(pid %d) used deprecated START_ARRAY ioctl. " | |
3088 | "This will not be supported beyond 2.6\n", | |
3089 | current->comm, current->pid); | |
3090 | cnt--; | |
3091 | } | |
3092 | err = autostart_array(new_decode_dev(arg)); | |
3093 | if (err) { | |
3094 | printk(KERN_WARNING "md: autostart failed!\n"); | |
3095 | goto abort; | |
3096 | } | |
3097 | goto done; | |
3098 | } | |
3099 | ||
3100 | err = mddev_lock(mddev); | |
3101 | if (err) { | |
3102 | printk(KERN_INFO | |
3103 | "md: ioctl lock interrupted, reason %d, cmd %d\n", | |
3104 | err, cmd); | |
3105 | goto abort; | |
3106 | } | |
3107 | ||
3108 | switch (cmd) | |
3109 | { | |
3110 | case SET_ARRAY_INFO: | |
3111 | { | |
3112 | mdu_array_info_t info; | |
3113 | if (!arg) | |
3114 | memset(&info, 0, sizeof(info)); | |
3115 | else if (copy_from_user(&info, argp, sizeof(info))) { | |
3116 | err = -EFAULT; | |
3117 | goto abort_unlock; | |
3118 | } | |
3119 | if (mddev->pers) { | |
3120 | err = update_array_info(mddev, &info); | |
3121 | if (err) { | |
3122 | printk(KERN_WARNING "md: couldn't update" | |
3123 | " array info. %d\n", err); | |
3124 | goto abort_unlock; | |
3125 | } | |
3126 | goto done_unlock; | |
3127 | } | |
3128 | if (!list_empty(&mddev->disks)) { | |
3129 | printk(KERN_WARNING | |
3130 | "md: array %s already has disks!\n", | |
3131 | mdname(mddev)); | |
3132 | err = -EBUSY; | |
3133 | goto abort_unlock; | |
3134 | } | |
3135 | if (mddev->raid_disks) { | |
3136 | printk(KERN_WARNING | |
3137 | "md: array %s already initialised!\n", | |
3138 | mdname(mddev)); | |
3139 | err = -EBUSY; | |
3140 | goto abort_unlock; | |
3141 | } | |
3142 | err = set_array_info(mddev, &info); | |
3143 | if (err) { | |
3144 | printk(KERN_WARNING "md: couldn't set" | |
3145 | " array info. %d\n", err); | |
3146 | goto abort_unlock; | |
3147 | } | |
3148 | } | |
3149 | goto done_unlock; | |
3150 | ||
3151 | default:; | |
3152 | } | |
3153 | ||
3154 | /* | |
3155 | * Commands querying/configuring an existing array: | |
3156 | */ | |
32a7627c N |
3157 | /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY, |
3158 | * RUN_ARRAY, and SET_BITMAP_FILE are allowed */ | |
3159 | if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY | |
3160 | && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) { | |
1da177e4 LT |
3161 | err = -ENODEV; |
3162 | goto abort_unlock; | |
3163 | } | |
3164 | ||
3165 | /* | |
3166 | * Commands even a read-only array can execute: | |
3167 | */ | |
3168 | switch (cmd) | |
3169 | { | |
3170 | case GET_ARRAY_INFO: | |
3171 | err = get_array_info(mddev, argp); | |
3172 | goto done_unlock; | |
3173 | ||
32a7627c | 3174 | case GET_BITMAP_FILE: |
87162a28 | 3175 | err = get_bitmap_file(mddev, argp); |
32a7627c N |
3176 | goto done_unlock; |
3177 | ||
1da177e4 LT |
3178 | case GET_DISK_INFO: |
3179 | err = get_disk_info(mddev, argp); | |
3180 | goto done_unlock; | |
3181 | ||
3182 | case RESTART_ARRAY_RW: | |
3183 | err = restart_array(mddev); | |
3184 | goto done_unlock; | |
3185 | ||
3186 | case STOP_ARRAY: | |
3187 | err = do_md_stop (mddev, 0); | |
3188 | goto done_unlock; | |
3189 | ||
3190 | case STOP_ARRAY_RO: | |
3191 | err = do_md_stop (mddev, 1); | |
3192 | goto done_unlock; | |
3193 | ||
3194 | /* | |
3195 | * We have a problem here : there is no easy way to give a CHS | |
3196 | * virtual geometry. We currently pretend that we have a 2 heads | |
3197 | * 4 sectors (with a BIG number of cylinders...). This drives | |
3198 | * dosfs just mad... ;-) | |
3199 | */ | |
3200 | case HDIO_GETGEO: | |
3201 | if (!loc) { | |
3202 | err = -EINVAL; | |
3203 | goto abort_unlock; | |
3204 | } | |
3205 | err = put_user (2, (char __user *) &loc->heads); | |
3206 | if (err) | |
3207 | goto abort_unlock; | |
3208 | err = put_user (4, (char __user *) &loc->sectors); | |
3209 | if (err) | |
3210 | goto abort_unlock; | |
3211 | err = put_user(get_capacity(mddev->gendisk)/8, | |
3212 | (short __user *) &loc->cylinders); | |
3213 | if (err) | |
3214 | goto abort_unlock; | |
3215 | err = put_user (get_start_sect(inode->i_bdev), | |
3216 | (long __user *) &loc->start); | |
3217 | goto done_unlock; | |
3218 | } | |
3219 | ||
3220 | /* | |
3221 | * The remaining ioctls are changing the state of the | |
3222 | * superblock, so we do not allow read-only arrays | |
3223 | * here: | |
3224 | */ | |
3225 | if (mddev->ro) { | |
3226 | err = -EROFS; | |
3227 | goto abort_unlock; | |
3228 | } | |
3229 | ||
3230 | switch (cmd) | |
3231 | { | |
3232 | case ADD_NEW_DISK: | |
3233 | { | |
3234 | mdu_disk_info_t info; | |
3235 | if (copy_from_user(&info, argp, sizeof(info))) | |
3236 | err = -EFAULT; | |
3237 | else | |
3238 | err = add_new_disk(mddev, &info); | |
3239 | goto done_unlock; | |
3240 | } | |
3241 | ||
3242 | case HOT_REMOVE_DISK: | |
3243 | err = hot_remove_disk(mddev, new_decode_dev(arg)); | |
3244 | goto done_unlock; | |
3245 | ||
3246 | case HOT_ADD_DISK: | |
3247 | err = hot_add_disk(mddev, new_decode_dev(arg)); | |
3248 | goto done_unlock; | |
3249 | ||
3250 | case SET_DISK_FAULTY: | |
3251 | err = set_disk_faulty(mddev, new_decode_dev(arg)); | |
3252 | goto done_unlock; | |
3253 | ||
3254 | case RUN_ARRAY: | |
3255 | err = do_md_run (mddev); | |
3256 | goto done_unlock; | |
3257 | ||
32a7627c N |
3258 | case SET_BITMAP_FILE: |
3259 | err = set_bitmap_file(mddev, (int)arg); | |
3260 | goto done_unlock; | |
3261 | ||
1da177e4 LT |
3262 | default: |
3263 | if (_IOC_TYPE(cmd) == MD_MAJOR) | |
3264 | printk(KERN_WARNING "md: %s(pid %d) used" | |
3265 | " obsolete MD ioctl, upgrade your" | |
3266 | " software to use new ictls.\n", | |
3267 | current->comm, current->pid); | |
3268 | err = -EINVAL; | |
3269 | goto abort_unlock; | |
3270 | } | |
3271 | ||
3272 | done_unlock: | |
3273 | abort_unlock: | |
3274 | mddev_unlock(mddev); | |
3275 | ||
3276 | return err; | |
3277 | done: | |
3278 | if (err) | |
3279 | MD_BUG(); | |
3280 | abort: | |
3281 | return err; | |
3282 | } | |
3283 | ||
3284 | static int md_open(struct inode *inode, struct file *file) | |
3285 | { | |
3286 | /* | |
3287 | * Succeed if we can lock the mddev, which confirms that | |
3288 | * it isn't being stopped right now. | |
3289 | */ | |
3290 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3291 | int err; | |
3292 | ||
3293 | if ((err = mddev_lock(mddev))) | |
3294 | goto out; | |
3295 | ||
3296 | err = 0; | |
3297 | mddev_get(mddev); | |
3298 | mddev_unlock(mddev); | |
3299 | ||
3300 | check_disk_change(inode->i_bdev); | |
3301 | out: | |
3302 | return err; | |
3303 | } | |
3304 | ||
3305 | static int md_release(struct inode *inode, struct file * file) | |
3306 | { | |
3307 | mddev_t *mddev = inode->i_bdev->bd_disk->private_data; | |
3308 | ||
3309 | if (!mddev) | |
3310 | BUG(); | |
3311 | mddev_put(mddev); | |
3312 | ||
3313 | return 0; | |
3314 | } | |
3315 | ||
3316 | static int md_media_changed(struct gendisk *disk) | |
3317 | { | |
3318 | mddev_t *mddev = disk->private_data; | |
3319 | ||
3320 | return mddev->changed; | |
3321 | } | |
3322 | ||
3323 | static int md_revalidate(struct gendisk *disk) | |
3324 | { | |
3325 | mddev_t *mddev = disk->private_data; | |
3326 | ||
3327 | mddev->changed = 0; | |
3328 | return 0; | |
3329 | } | |
3330 | static struct block_device_operations md_fops = | |
3331 | { | |
3332 | .owner = THIS_MODULE, | |
3333 | .open = md_open, | |
3334 | .release = md_release, | |
3335 | .ioctl = md_ioctl, | |
3336 | .media_changed = md_media_changed, | |
3337 | .revalidate_disk= md_revalidate, | |
3338 | }; | |
3339 | ||
75c96f85 | 3340 | static int md_thread(void * arg) |
1da177e4 LT |
3341 | { |
3342 | mdk_thread_t *thread = arg; | |
3343 | ||
1da177e4 LT |
3344 | /* |
3345 | * md_thread is a 'system-thread', it's priority should be very | |
3346 | * high. We avoid resource deadlocks individually in each | |
3347 | * raid personality. (RAID5 does preallocation) We also use RR and | |
3348 | * the very same RT priority as kswapd, thus we will never get | |
3349 | * into a priority inversion deadlock. | |
3350 | * | |
3351 | * we definitely have to have equal or higher priority than | |
3352 | * bdflush, otherwise bdflush will deadlock if there are too | |
3353 | * many dirty RAID5 blocks. | |
3354 | */ | |
1da177e4 | 3355 | |
6985c43f | 3356 | allow_signal(SIGKILL); |
1da177e4 | 3357 | complete(thread->event); |
a6fb0934 | 3358 | while (!kthread_should_stop()) { |
1da177e4 LT |
3359 | void (*run)(mddev_t *); |
3360 | ||
32a7627c | 3361 | wait_event_interruptible_timeout(thread->wqueue, |
a6fb0934 N |
3362 | test_bit(THREAD_WAKEUP, &thread->flags) |
3363 | || kthread_should_stop(), | |
32a7627c | 3364 | thread->timeout); |
3e1d1d28 | 3365 | try_to_freeze(); |
1da177e4 LT |
3366 | |
3367 | clear_bit(THREAD_WAKEUP, &thread->flags); | |
3368 | ||
3369 | run = thread->run; | |
3370 | if (run) | |
3371 | run(thread->mddev); | |
1da177e4 | 3372 | } |
a6fb0934 | 3373 | |
1da177e4 LT |
3374 | return 0; |
3375 | } | |
3376 | ||
3377 | void md_wakeup_thread(mdk_thread_t *thread) | |
3378 | { | |
3379 | if (thread) { | |
3380 | dprintk("md: waking up MD thread %s.\n", thread->tsk->comm); | |
3381 | set_bit(THREAD_WAKEUP, &thread->flags); | |
3382 | wake_up(&thread->wqueue); | |
3383 | } | |
3384 | } | |
3385 | ||
3386 | mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev, | |
3387 | const char *name) | |
3388 | { | |
3389 | mdk_thread_t *thread; | |
1da177e4 LT |
3390 | struct completion event; |
3391 | ||
a6fb0934 | 3392 | thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL); |
1da177e4 LT |
3393 | if (!thread) |
3394 | return NULL; | |
3395 | ||
3396 | memset(thread, 0, sizeof(mdk_thread_t)); | |
3397 | init_waitqueue_head(&thread->wqueue); | |
3398 | ||
3399 | init_completion(&event); | |
3400 | thread->event = &event; | |
3401 | thread->run = run; | |
3402 | thread->mddev = mddev; | |
3403 | thread->name = name; | |
32a7627c | 3404 | thread->timeout = MAX_SCHEDULE_TIMEOUT; |
6985c43f | 3405 | thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev)); |
a6fb0934 | 3406 | if (IS_ERR(thread->tsk)) { |
1da177e4 LT |
3407 | kfree(thread); |
3408 | return NULL; | |
3409 | } | |
3410 | wait_for_completion(&event); | |
3411 | return thread; | |
3412 | } | |
3413 | ||
1da177e4 LT |
3414 | void md_unregister_thread(mdk_thread_t *thread) |
3415 | { | |
d28446fe | 3416 | dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid); |
a6fb0934 N |
3417 | |
3418 | kthread_stop(thread->tsk); | |
1da177e4 LT |
3419 | kfree(thread); |
3420 | } | |
3421 | ||
3422 | void md_error(mddev_t *mddev, mdk_rdev_t *rdev) | |
3423 | { | |
3424 | if (!mddev) { | |
3425 | MD_BUG(); | |
3426 | return; | |
3427 | } | |
3428 | ||
b2d444d7 | 3429 | if (!rdev || test_bit(Faulty, &rdev->flags)) |
1da177e4 | 3430 | return; |
32a7627c | 3431 | /* |
1da177e4 LT |
3432 | dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n", |
3433 | mdname(mddev), | |
3434 | MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev), | |
3435 | __builtin_return_address(0),__builtin_return_address(1), | |
3436 | __builtin_return_address(2),__builtin_return_address(3)); | |
32a7627c | 3437 | */ |
1da177e4 LT |
3438 | if (!mddev->pers->error_handler) |
3439 | return; | |
3440 | mddev->pers->error_handler(mddev,rdev); | |
3441 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
3442 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
3443 | md_wakeup_thread(mddev->thread); | |
3444 | } | |
3445 | ||
3446 | /* seq_file implementation /proc/mdstat */ | |
3447 | ||
3448 | static void status_unused(struct seq_file *seq) | |
3449 | { | |
3450 | int i = 0; | |
3451 | mdk_rdev_t *rdev; | |
3452 | struct list_head *tmp; | |
3453 | ||
3454 | seq_printf(seq, "unused devices: "); | |
3455 | ||
3456 | ITERATE_RDEV_PENDING(rdev,tmp) { | |
3457 | char b[BDEVNAME_SIZE]; | |
3458 | i++; | |
3459 | seq_printf(seq, "%s ", | |
3460 | bdevname(rdev->bdev,b)); | |
3461 | } | |
3462 | if (!i) | |
3463 | seq_printf(seq, "<none>"); | |
3464 | ||
3465 | seq_printf(seq, "\n"); | |
3466 | } | |
3467 | ||
3468 | ||
3469 | static void status_resync(struct seq_file *seq, mddev_t * mddev) | |
3470 | { | |
3471 | unsigned long max_blocks, resync, res, dt, db, rt; | |
3472 | ||
3473 | resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2; | |
3474 | ||
3475 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
3476 | max_blocks = mddev->resync_max_sectors >> 1; | |
3477 | else | |
3478 | max_blocks = mddev->size; | |
3479 | ||
3480 | /* | |
3481 | * Should not happen. | |
3482 | */ | |
3483 | if (!max_blocks) { | |
3484 | MD_BUG(); | |
3485 | return; | |
3486 | } | |
3487 | res = (resync/1024)*1000/(max_blocks/1024 + 1); | |
3488 | { | |
3489 | int i, x = res/50, y = 20-x; | |
3490 | seq_printf(seq, "["); | |
3491 | for (i = 0; i < x; i++) | |
3492 | seq_printf(seq, "="); | |
3493 | seq_printf(seq, ">"); | |
3494 | for (i = 0; i < y; i++) | |
3495 | seq_printf(seq, "."); | |
3496 | seq_printf(seq, "] "); | |
3497 | } | |
3498 | seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)", | |
3499 | (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ? | |
3500 | "resync" : "recovery"), | |
3501 | res/10, res % 10, resync, max_blocks); | |
3502 | ||
3503 | /* | |
3504 | * We do not want to overflow, so the order of operands and | |
3505 | * the * 100 / 100 trick are important. We do a +1 to be | |
3506 | * safe against division by zero. We only estimate anyway. | |
3507 | * | |
3508 | * dt: time from mark until now | |
3509 | * db: blocks written from mark until now | |
3510 | * rt: remaining time | |
3511 | */ | |
3512 | dt = ((jiffies - mddev->resync_mark) / HZ); | |
3513 | if (!dt) dt++; | |
3514 | db = resync - (mddev->resync_mark_cnt/2); | |
3515 | rt = (dt * ((max_blocks-resync) / (db/100+1)))/100; | |
3516 | ||
3517 | seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6); | |
3518 | ||
3519 | seq_printf(seq, " speed=%ldK/sec", db/dt); | |
3520 | } | |
3521 | ||
3522 | static void *md_seq_start(struct seq_file *seq, loff_t *pos) | |
3523 | { | |
3524 | struct list_head *tmp; | |
3525 | loff_t l = *pos; | |
3526 | mddev_t *mddev; | |
3527 | ||
3528 | if (l >= 0x10000) | |
3529 | return NULL; | |
3530 | if (!l--) | |
3531 | /* header */ | |
3532 | return (void*)1; | |
3533 | ||
3534 | spin_lock(&all_mddevs_lock); | |
3535 | list_for_each(tmp,&all_mddevs) | |
3536 | if (!l--) { | |
3537 | mddev = list_entry(tmp, mddev_t, all_mddevs); | |
3538 | mddev_get(mddev); | |
3539 | spin_unlock(&all_mddevs_lock); | |
3540 | return mddev; | |
3541 | } | |
3542 | spin_unlock(&all_mddevs_lock); | |
3543 | if (!l--) | |
3544 | return (void*)2;/* tail */ | |
3545 | return NULL; | |
3546 | } | |
3547 | ||
3548 | static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
3549 | { | |
3550 | struct list_head *tmp; | |
3551 | mddev_t *next_mddev, *mddev = v; | |
3552 | ||
3553 | ++*pos; | |
3554 | if (v == (void*)2) | |
3555 | return NULL; | |
3556 | ||
3557 | spin_lock(&all_mddevs_lock); | |
3558 | if (v == (void*)1) | |
3559 | tmp = all_mddevs.next; | |
3560 | else | |
3561 | tmp = mddev->all_mddevs.next; | |
3562 | if (tmp != &all_mddevs) | |
3563 | next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs)); | |
3564 | else { | |
3565 | next_mddev = (void*)2; | |
3566 | *pos = 0x10000; | |
3567 | } | |
3568 | spin_unlock(&all_mddevs_lock); | |
3569 | ||
3570 | if (v != (void*)1) | |
3571 | mddev_put(mddev); | |
3572 | return next_mddev; | |
3573 | ||
3574 | } | |
3575 | ||
3576 | static void md_seq_stop(struct seq_file *seq, void *v) | |
3577 | { | |
3578 | mddev_t *mddev = v; | |
3579 | ||
3580 | if (mddev && v != (void*)1 && v != (void*)2) | |
3581 | mddev_put(mddev); | |
3582 | } | |
3583 | ||
3584 | static int md_seq_show(struct seq_file *seq, void *v) | |
3585 | { | |
3586 | mddev_t *mddev = v; | |
3587 | sector_t size; | |
3588 | struct list_head *tmp2; | |
3589 | mdk_rdev_t *rdev; | |
3590 | int i; | |
32a7627c | 3591 | struct bitmap *bitmap; |
1da177e4 LT |
3592 | |
3593 | if (v == (void*)1) { | |
3594 | seq_printf(seq, "Personalities : "); | |
3595 | spin_lock(&pers_lock); | |
3596 | for (i = 0; i < MAX_PERSONALITY; i++) | |
3597 | if (pers[i]) | |
3598 | seq_printf(seq, "[%s] ", pers[i]->name); | |
3599 | ||
3600 | spin_unlock(&pers_lock); | |
3601 | seq_printf(seq, "\n"); | |
3602 | return 0; | |
3603 | } | |
3604 | if (v == (void*)2) { | |
3605 | status_unused(seq); | |
3606 | return 0; | |
3607 | } | |
3608 | ||
3609 | if (mddev_lock(mddev)!=0) | |
3610 | return -EINTR; | |
3611 | if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) { | |
3612 | seq_printf(seq, "%s : %sactive", mdname(mddev), | |
3613 | mddev->pers ? "" : "in"); | |
3614 | if (mddev->pers) { | |
3615 | if (mddev->ro) | |
3616 | seq_printf(seq, " (read-only)"); | |
3617 | seq_printf(seq, " %s", mddev->pers->name); | |
3618 | } | |
3619 | ||
3620 | size = 0; | |
3621 | ITERATE_RDEV(mddev,rdev,tmp2) { | |
3622 | char b[BDEVNAME_SIZE]; | |
3623 | seq_printf(seq, " %s[%d]", | |
3624 | bdevname(rdev->bdev,b), rdev->desc_nr); | |
8ddf9efe N |
3625 | if (test_bit(WriteMostly, &rdev->flags)) |
3626 | seq_printf(seq, "(W)"); | |
b2d444d7 | 3627 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
3628 | seq_printf(seq, "(F)"); |
3629 | continue; | |
b325a32e N |
3630 | } else if (rdev->raid_disk < 0) |
3631 | seq_printf(seq, "(S)"); /* spare */ | |
1da177e4 LT |
3632 | size += rdev->size; |
3633 | } | |
3634 | ||
3635 | if (!list_empty(&mddev->disks)) { | |
3636 | if (mddev->pers) | |
3637 | seq_printf(seq, "\n %llu blocks", | |
3638 | (unsigned long long)mddev->array_size); | |
3639 | else | |
3640 | seq_printf(seq, "\n %llu blocks", | |
3641 | (unsigned long long)size); | |
3642 | } | |
1cd6bf19 N |
3643 | if (mddev->persistent) { |
3644 | if (mddev->major_version != 0 || | |
3645 | mddev->minor_version != 90) { | |
3646 | seq_printf(seq," super %d.%d", | |
3647 | mddev->major_version, | |
3648 | mddev->minor_version); | |
3649 | } | |
3650 | } else | |
3651 | seq_printf(seq, " super non-persistent"); | |
1da177e4 LT |
3652 | |
3653 | if (mddev->pers) { | |
3654 | mddev->pers->status (seq, mddev); | |
3655 | seq_printf(seq, "\n "); | |
32a7627c | 3656 | if (mddev->curr_resync > 2) { |
1da177e4 | 3657 | status_resync (seq, mddev); |
32a7627c N |
3658 | seq_printf(seq, "\n "); |
3659 | } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2) | |
3660 | seq_printf(seq, " resync=DELAYED\n "); | |
3661 | } else | |
3662 | seq_printf(seq, "\n "); | |
3663 | ||
3664 | if ((bitmap = mddev->bitmap)) { | |
32a7627c N |
3665 | unsigned long chunk_kb; |
3666 | unsigned long flags; | |
32a7627c N |
3667 | spin_lock_irqsave(&bitmap->lock, flags); |
3668 | chunk_kb = bitmap->chunksize >> 10; | |
3669 | seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], " | |
3670 | "%lu%s chunk", | |
3671 | bitmap->pages - bitmap->missing_pages, | |
3672 | bitmap->pages, | |
3673 | (bitmap->pages - bitmap->missing_pages) | |
3674 | << (PAGE_SHIFT - 10), | |
3675 | chunk_kb ? chunk_kb : bitmap->chunksize, | |
3676 | chunk_kb ? "KB" : "B"); | |
78d742d8 N |
3677 | if (bitmap->file) { |
3678 | seq_printf(seq, ", file: "); | |
3679 | seq_path(seq, bitmap->file->f_vfsmnt, | |
3680 | bitmap->file->f_dentry," \t\n"); | |
32a7627c | 3681 | } |
78d742d8 | 3682 | |
32a7627c N |
3683 | seq_printf(seq, "\n"); |
3684 | spin_unlock_irqrestore(&bitmap->lock, flags); | |
1da177e4 LT |
3685 | } |
3686 | ||
3687 | seq_printf(seq, "\n"); | |
3688 | } | |
3689 | mddev_unlock(mddev); | |
3690 | ||
3691 | return 0; | |
3692 | } | |
3693 | ||
3694 | static struct seq_operations md_seq_ops = { | |
3695 | .start = md_seq_start, | |
3696 | .next = md_seq_next, | |
3697 | .stop = md_seq_stop, | |
3698 | .show = md_seq_show, | |
3699 | }; | |
3700 | ||
3701 | static int md_seq_open(struct inode *inode, struct file *file) | |
3702 | { | |
3703 | int error; | |
3704 | ||
3705 | error = seq_open(file, &md_seq_ops); | |
3706 | return error; | |
3707 | } | |
3708 | ||
3709 | static struct file_operations md_seq_fops = { | |
3710 | .open = md_seq_open, | |
3711 | .read = seq_read, | |
3712 | .llseek = seq_lseek, | |
3713 | .release = seq_release, | |
3714 | }; | |
3715 | ||
3716 | int register_md_personality(int pnum, mdk_personality_t *p) | |
3717 | { | |
3718 | if (pnum >= MAX_PERSONALITY) { | |
3719 | printk(KERN_ERR | |
3720 | "md: tried to install personality %s as nr %d, but max is %lu\n", | |
3721 | p->name, pnum, MAX_PERSONALITY-1); | |
3722 | return -EINVAL; | |
3723 | } | |
3724 | ||
3725 | spin_lock(&pers_lock); | |
3726 | if (pers[pnum]) { | |
3727 | spin_unlock(&pers_lock); | |
1da177e4 LT |
3728 | return -EBUSY; |
3729 | } | |
3730 | ||
3731 | pers[pnum] = p; | |
3732 | printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum); | |
3733 | spin_unlock(&pers_lock); | |
3734 | return 0; | |
3735 | } | |
3736 | ||
3737 | int unregister_md_personality(int pnum) | |
3738 | { | |
a757e64c | 3739 | if (pnum >= MAX_PERSONALITY) |
1da177e4 | 3740 | return -EINVAL; |
1da177e4 LT |
3741 | |
3742 | printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name); | |
3743 | spin_lock(&pers_lock); | |
3744 | pers[pnum] = NULL; | |
3745 | spin_unlock(&pers_lock); | |
3746 | return 0; | |
3747 | } | |
3748 | ||
3749 | static int is_mddev_idle(mddev_t *mddev) | |
3750 | { | |
3751 | mdk_rdev_t * rdev; | |
3752 | struct list_head *tmp; | |
3753 | int idle; | |
3754 | unsigned long curr_events; | |
3755 | ||
3756 | idle = 1; | |
3757 | ITERATE_RDEV(mddev,rdev,tmp) { | |
3758 | struct gendisk *disk = rdev->bdev->bd_contains->bd_disk; | |
a362357b JA |
3759 | curr_events = disk_stat_read(disk, sectors[0]) + |
3760 | disk_stat_read(disk, sectors[1]) - | |
1da177e4 LT |
3761 | atomic_read(&disk->sync_io); |
3762 | /* Allow some slack between valud of curr_events and last_events, | |
3763 | * as there are some uninteresting races. | |
3764 | * Note: the following is an unsigned comparison. | |
3765 | */ | |
3766 | if ((curr_events - rdev->last_events + 32) > 64) { | |
3767 | rdev->last_events = curr_events; | |
3768 | idle = 0; | |
3769 | } | |
3770 | } | |
3771 | return idle; | |
3772 | } | |
3773 | ||
3774 | void md_done_sync(mddev_t *mddev, int blocks, int ok) | |
3775 | { | |
3776 | /* another "blocks" (512byte) blocks have been synced */ | |
3777 | atomic_sub(blocks, &mddev->recovery_active); | |
3778 | wake_up(&mddev->recovery_wait); | |
3779 | if (!ok) { | |
3780 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
3781 | md_wakeup_thread(mddev->thread); | |
3782 | // stop recovery, signal do_sync .... | |
3783 | } | |
3784 | } | |
3785 | ||
3786 | ||
06d91a5f N |
3787 | /* md_write_start(mddev, bi) |
3788 | * If we need to update some array metadata (e.g. 'active' flag | |
3d310eb7 N |
3789 | * in superblock) before writing, schedule a superblock update |
3790 | * and wait for it to complete. | |
06d91a5f | 3791 | */ |
3d310eb7 | 3792 | void md_write_start(mddev_t *mddev, struct bio *bi) |
1da177e4 | 3793 | { |
06d91a5f | 3794 | if (bio_data_dir(bi) != WRITE) |
3d310eb7 | 3795 | return; |
06d91a5f N |
3796 | |
3797 | atomic_inc(&mddev->writes_pending); | |
06d91a5f | 3798 | if (mddev->in_sync) { |
3d310eb7 N |
3799 | spin_lock(&mddev->write_lock); |
3800 | if (mddev->in_sync) { | |
3801 | mddev->in_sync = 0; | |
3802 | mddev->sb_dirty = 1; | |
3803 | md_wakeup_thread(mddev->thread); | |
3804 | } | |
3805 | spin_unlock(&mddev->write_lock); | |
06d91a5f | 3806 | } |
3d310eb7 | 3807 | wait_event(mddev->sb_wait, mddev->sb_dirty==0); |
1da177e4 LT |
3808 | } |
3809 | ||
3810 | void md_write_end(mddev_t *mddev) | |
3811 | { | |
3812 | if (atomic_dec_and_test(&mddev->writes_pending)) { | |
3813 | if (mddev->safemode == 2) | |
3814 | md_wakeup_thread(mddev->thread); | |
3815 | else | |
3816 | mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay); | |
3817 | } | |
3818 | } | |
3819 | ||
75c96f85 | 3820 | static DECLARE_WAIT_QUEUE_HEAD(resync_wait); |
1da177e4 LT |
3821 | |
3822 | #define SYNC_MARKS 10 | |
3823 | #define SYNC_MARK_STEP (3*HZ) | |
3824 | static void md_do_sync(mddev_t *mddev) | |
3825 | { | |
3826 | mddev_t *mddev2; | |
3827 | unsigned int currspeed = 0, | |
3828 | window; | |
57afd89f | 3829 | sector_t max_sectors,j, io_sectors; |
1da177e4 LT |
3830 | unsigned long mark[SYNC_MARKS]; |
3831 | sector_t mark_cnt[SYNC_MARKS]; | |
3832 | int last_mark,m; | |
3833 | struct list_head *tmp; | |
3834 | sector_t last_check; | |
57afd89f | 3835 | int skipped = 0; |
1da177e4 LT |
3836 | |
3837 | /* just incase thread restarts... */ | |
3838 | if (test_bit(MD_RECOVERY_DONE, &mddev->recovery)) | |
3839 | return; | |
3840 | ||
3841 | /* we overload curr_resync somewhat here. | |
3842 | * 0 == not engaged in resync at all | |
3843 | * 2 == checking that there is no conflict with another sync | |
3844 | * 1 == like 2, but have yielded to allow conflicting resync to | |
3845 | * commense | |
3846 | * other == active in resync - this many blocks | |
3847 | * | |
3848 | * Before starting a resync we must have set curr_resync to | |
3849 | * 2, and then checked that every "conflicting" array has curr_resync | |
3850 | * less than ours. When we find one that is the same or higher | |
3851 | * we wait on resync_wait. To avoid deadlock, we reduce curr_resync | |
3852 | * to 1 if we choose to yield (based arbitrarily on address of mddev structure). | |
3853 | * This will mean we have to start checking from the beginning again. | |
3854 | * | |
3855 | */ | |
3856 | ||
3857 | do { | |
3858 | mddev->curr_resync = 2; | |
3859 | ||
3860 | try_again: | |
8712e553 N |
3861 | if (signal_pending(current) || |
3862 | kthread_should_stop()) { | |
1da177e4 | 3863 | flush_signals(current); |
6985c43f | 3864 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); |
1da177e4 LT |
3865 | goto skip; |
3866 | } | |
3867 | ITERATE_MDDEV(mddev2,tmp) { | |
1da177e4 LT |
3868 | if (mddev2 == mddev) |
3869 | continue; | |
3870 | if (mddev2->curr_resync && | |
3871 | match_mddev_units(mddev,mddev2)) { | |
3872 | DEFINE_WAIT(wq); | |
3873 | if (mddev < mddev2 && mddev->curr_resync == 2) { | |
3874 | /* arbitrarily yield */ | |
3875 | mddev->curr_resync = 1; | |
3876 | wake_up(&resync_wait); | |
3877 | } | |
3878 | if (mddev > mddev2 && mddev->curr_resync == 1) | |
3879 | /* no need to wait here, we can wait the next | |
3880 | * time 'round when curr_resync == 2 | |
3881 | */ | |
3882 | continue; | |
3883 | prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE); | |
8712e553 N |
3884 | if (!signal_pending(current) && |
3885 | !kthread_should_stop() && | |
3886 | mddev2->curr_resync >= mddev->curr_resync) { | |
1da177e4 LT |
3887 | printk(KERN_INFO "md: delaying resync of %s" |
3888 | " until %s has finished resync (they" | |
3889 | " share one or more physical units)\n", | |
3890 | mdname(mddev), mdname(mddev2)); | |
3891 | mddev_put(mddev2); | |
3892 | schedule(); | |
3893 | finish_wait(&resync_wait, &wq); | |
3894 | goto try_again; | |
3895 | } | |
3896 | finish_wait(&resync_wait, &wq); | |
3897 | } | |
3898 | } | |
3899 | } while (mddev->curr_resync < 2); | |
3900 | ||
9d88883e | 3901 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) { |
1da177e4 | 3902 | /* resync follows the size requested by the personality, |
57afd89f | 3903 | * which defaults to physical size, but can be virtual size |
1da177e4 LT |
3904 | */ |
3905 | max_sectors = mddev->resync_max_sectors; | |
9d88883e N |
3906 | mddev->resync_mismatches = 0; |
3907 | } else | |
1da177e4 LT |
3908 | /* recovery follows the physical size of devices */ |
3909 | max_sectors = mddev->size << 1; | |
3910 | ||
3911 | printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev)); | |
3912 | printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:" | |
3913 | " %d KB/sec/disc.\n", sysctl_speed_limit_min); | |
338cec32 | 3914 | printk(KERN_INFO "md: using maximum available idle IO bandwidth " |
1da177e4 LT |
3915 | "(but not more than %d KB/sec) for reconstruction.\n", |
3916 | sysctl_speed_limit_max); | |
3917 | ||
3918 | is_mddev_idle(mddev); /* this also initializes IO event counters */ | |
32a7627c | 3919 | /* we don't use the checkpoint if there's a bitmap */ |
24dd469d N |
3920 | if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap |
3921 | && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) | |
1da177e4 LT |
3922 | j = mddev->recovery_cp; |
3923 | else | |
3924 | j = 0; | |
57afd89f | 3925 | io_sectors = 0; |
1da177e4 LT |
3926 | for (m = 0; m < SYNC_MARKS; m++) { |
3927 | mark[m] = jiffies; | |
57afd89f | 3928 | mark_cnt[m] = io_sectors; |
1da177e4 LT |
3929 | } |
3930 | last_mark = 0; | |
3931 | mddev->resync_mark = mark[last_mark]; | |
3932 | mddev->resync_mark_cnt = mark_cnt[last_mark]; | |
3933 | ||
3934 | /* | |
3935 | * Tune reconstruction: | |
3936 | */ | |
3937 | window = 32*(PAGE_SIZE/512); | |
3938 | printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n", | |
3939 | window/2,(unsigned long long) max_sectors/2); | |
3940 | ||
3941 | atomic_set(&mddev->recovery_active, 0); | |
3942 | init_waitqueue_head(&mddev->recovery_wait); | |
3943 | last_check = 0; | |
3944 | ||
3945 | if (j>2) { | |
3946 | printk(KERN_INFO | |
3947 | "md: resuming recovery of %s from checkpoint.\n", | |
3948 | mdname(mddev)); | |
3949 | mddev->curr_resync = j; | |
3950 | } | |
3951 | ||
3952 | while (j < max_sectors) { | |
57afd89f | 3953 | sector_t sectors; |
1da177e4 | 3954 | |
57afd89f N |
3955 | skipped = 0; |
3956 | sectors = mddev->pers->sync_request(mddev, j, &skipped, | |
3957 | currspeed < sysctl_speed_limit_min); | |
3958 | if (sectors == 0) { | |
1da177e4 LT |
3959 | set_bit(MD_RECOVERY_ERR, &mddev->recovery); |
3960 | goto out; | |
3961 | } | |
57afd89f N |
3962 | |
3963 | if (!skipped) { /* actual IO requested */ | |
3964 | io_sectors += sectors; | |
3965 | atomic_add(sectors, &mddev->recovery_active); | |
3966 | } | |
3967 | ||
1da177e4 LT |
3968 | j += sectors; |
3969 | if (j>1) mddev->curr_resync = j; | |
3970 | ||
57afd89f N |
3971 | |
3972 | if (last_check + window > io_sectors || j == max_sectors) | |
1da177e4 LT |
3973 | continue; |
3974 | ||
57afd89f | 3975 | last_check = io_sectors; |
1da177e4 LT |
3976 | |
3977 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) || | |
3978 | test_bit(MD_RECOVERY_ERR, &mddev->recovery)) | |
3979 | break; | |
3980 | ||
3981 | repeat: | |
3982 | if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) { | |
3983 | /* step marks */ | |
3984 | int next = (last_mark+1) % SYNC_MARKS; | |
3985 | ||
3986 | mddev->resync_mark = mark[next]; | |
3987 | mddev->resync_mark_cnt = mark_cnt[next]; | |
3988 | mark[next] = jiffies; | |
57afd89f | 3989 | mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active); |
1da177e4 LT |
3990 | last_mark = next; |
3991 | } | |
3992 | ||
3993 | ||
8712e553 | 3994 | if (signal_pending(current) || kthread_should_stop()) { |
1da177e4 LT |
3995 | /* |
3996 | * got a signal, exit. | |
3997 | */ | |
3998 | printk(KERN_INFO | |
3999 | "md: md_do_sync() got signal ... exiting\n"); | |
4000 | flush_signals(current); | |
4001 | set_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4002 | goto out; | |
4003 | } | |
4004 | ||
4005 | /* | |
4006 | * this loop exits only if either when we are slower than | |
4007 | * the 'hard' speed limit, or the system was IO-idle for | |
4008 | * a jiffy. | |
4009 | * the system might be non-idle CPU-wise, but we only care | |
4010 | * about not overloading the IO subsystem. (things like an | |
4011 | * e2fsck being done on the RAID array should execute fast) | |
4012 | */ | |
4013 | mddev->queue->unplug_fn(mddev->queue); | |
4014 | cond_resched(); | |
4015 | ||
57afd89f N |
4016 | currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2 |
4017 | /((jiffies-mddev->resync_mark)/HZ +1) +1; | |
1da177e4 LT |
4018 | |
4019 | if (currspeed > sysctl_speed_limit_min) { | |
4020 | if ((currspeed > sysctl_speed_limit_max) || | |
4021 | !is_mddev_idle(mddev)) { | |
4022 | msleep_interruptible(250); | |
4023 | goto repeat; | |
4024 | } | |
4025 | } | |
4026 | } | |
4027 | printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev)); | |
4028 | /* | |
4029 | * this also signals 'finished resyncing' to md_stop | |
4030 | */ | |
4031 | out: | |
4032 | mddev->queue->unplug_fn(mddev->queue); | |
4033 | ||
4034 | wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active)); | |
4035 | ||
4036 | /* tell personality that we are finished */ | |
57afd89f | 4037 | mddev->pers->sync_request(mddev, max_sectors, &skipped, 1); |
1da177e4 LT |
4038 | |
4039 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4040 | mddev->curr_resync > 2 && | |
4041 | mddev->curr_resync >= mddev->recovery_cp) { | |
4042 | if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4043 | printk(KERN_INFO | |
4044 | "md: checkpointing recovery of %s.\n", | |
4045 | mdname(mddev)); | |
4046 | mddev->recovery_cp = mddev->curr_resync; | |
4047 | } else | |
4048 | mddev->recovery_cp = MaxSector; | |
4049 | } | |
4050 | ||
1da177e4 LT |
4051 | skip: |
4052 | mddev->curr_resync = 0; | |
4053 | wake_up(&resync_wait); | |
4054 | set_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
4055 | md_wakeup_thread(mddev->thread); | |
4056 | } | |
4057 | ||
4058 | ||
4059 | /* | |
4060 | * This routine is regularly called by all per-raid-array threads to | |
4061 | * deal with generic issues like resync and super-block update. | |
4062 | * Raid personalities that don't have a thread (linear/raid0) do not | |
4063 | * need this as they never do any recovery or update the superblock. | |
4064 | * | |
4065 | * It does not do any resync itself, but rather "forks" off other threads | |
4066 | * to do that as needed. | |
4067 | * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in | |
4068 | * "->recovery" and create a thread at ->sync_thread. | |
4069 | * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR) | |
4070 | * and wakeups up this thread which will reap the thread and finish up. | |
4071 | * This thread also removes any faulty devices (with nr_pending == 0). | |
4072 | * | |
4073 | * The overall approach is: | |
4074 | * 1/ if the superblock needs updating, update it. | |
4075 | * 2/ If a recovery thread is running, don't do anything else. | |
4076 | * 3/ If recovery has finished, clean up, possibly marking spares active. | |
4077 | * 4/ If there are any faulty devices, remove them. | |
4078 | * 5/ If array is degraded, try to add spares devices | |
4079 | * 6/ If array has spares or is not in-sync, start a resync thread. | |
4080 | */ | |
4081 | void md_check_recovery(mddev_t *mddev) | |
4082 | { | |
4083 | mdk_rdev_t *rdev; | |
4084 | struct list_head *rtmp; | |
4085 | ||
4086 | ||
5f40402d N |
4087 | if (mddev->bitmap) |
4088 | bitmap_daemon_work(mddev->bitmap); | |
1da177e4 LT |
4089 | |
4090 | if (mddev->ro) | |
4091 | return; | |
fca4d848 N |
4092 | |
4093 | if (signal_pending(current)) { | |
4094 | if (mddev->pers->sync_request) { | |
4095 | printk(KERN_INFO "md: %s in immediate safe mode\n", | |
4096 | mdname(mddev)); | |
4097 | mddev->safemode = 2; | |
4098 | } | |
4099 | flush_signals(current); | |
4100 | } | |
4101 | ||
1da177e4 LT |
4102 | if ( ! ( |
4103 | mddev->sb_dirty || | |
4104 | test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) || | |
fca4d848 N |
4105 | test_bit(MD_RECOVERY_DONE, &mddev->recovery) || |
4106 | (mddev->safemode == 1) || | |
4107 | (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending) | |
4108 | && !mddev->in_sync && mddev->recovery_cp == MaxSector) | |
1da177e4 LT |
4109 | )) |
4110 | return; | |
fca4d848 | 4111 | |
1da177e4 LT |
4112 | if (mddev_trylock(mddev)==0) { |
4113 | int spares =0; | |
fca4d848 | 4114 | |
06d91a5f | 4115 | spin_lock(&mddev->write_lock); |
fca4d848 N |
4116 | if (mddev->safemode && !atomic_read(&mddev->writes_pending) && |
4117 | !mddev->in_sync && mddev->recovery_cp == MaxSector) { | |
4118 | mddev->in_sync = 1; | |
4119 | mddev->sb_dirty = 1; | |
4120 | } | |
4121 | if (mddev->safemode == 1) | |
4122 | mddev->safemode = 0; | |
06d91a5f | 4123 | spin_unlock(&mddev->write_lock); |
fca4d848 | 4124 | |
1da177e4 LT |
4125 | if (mddev->sb_dirty) |
4126 | md_update_sb(mddev); | |
06d91a5f | 4127 | |
06d91a5f | 4128 | |
1da177e4 LT |
4129 | if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) && |
4130 | !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) { | |
4131 | /* resync/recovery still happening */ | |
4132 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4133 | goto unlock; | |
4134 | } | |
4135 | if (mddev->sync_thread) { | |
4136 | /* resync has finished, collect result */ | |
4137 | md_unregister_thread(mddev->sync_thread); | |
4138 | mddev->sync_thread = NULL; | |
4139 | if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) && | |
4140 | !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) { | |
4141 | /* success...*/ | |
4142 | /* activate any spares */ | |
4143 | mddev->pers->spare_active(mddev); | |
4144 | } | |
4145 | md_update_sb(mddev); | |
41158c7e N |
4146 | |
4147 | /* if array is no-longer degraded, then any saved_raid_disk | |
4148 | * information must be scrapped | |
4149 | */ | |
4150 | if (!mddev->degraded) | |
4151 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4152 | rdev->saved_raid_disk = -1; | |
4153 | ||
1da177e4 LT |
4154 | mddev->recovery = 0; |
4155 | /* flag recovery needed just to double check */ | |
4156 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4157 | goto unlock; | |
4158 | } | |
24dd469d N |
4159 | /* Clear some bits that don't mean anything, but |
4160 | * might be left set | |
4161 | */ | |
4162 | clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
4163 | clear_bit(MD_RECOVERY_ERR, &mddev->recovery); | |
4164 | clear_bit(MD_RECOVERY_INTR, &mddev->recovery); | |
4165 | clear_bit(MD_RECOVERY_DONE, &mddev->recovery); | |
1da177e4 LT |
4166 | |
4167 | /* no recovery is running. | |
4168 | * remove any failed drives, then | |
4169 | * add spares if possible. | |
4170 | * Spare are also removed and re-added, to allow | |
4171 | * the personality to fail the re-add. | |
4172 | */ | |
4173 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4174 | if (rdev->raid_disk >= 0 && | |
b2d444d7 | 4175 | (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) && |
1da177e4 | 4176 | atomic_read(&rdev->nr_pending)==0) { |
86e6ffdd N |
4177 | if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) { |
4178 | char nm[20]; | |
4179 | sprintf(nm,"rd%d", rdev->raid_disk); | |
4180 | sysfs_remove_link(&mddev->kobj, nm); | |
1da177e4 | 4181 | rdev->raid_disk = -1; |
86e6ffdd | 4182 | } |
1da177e4 LT |
4183 | } |
4184 | ||
4185 | if (mddev->degraded) { | |
4186 | ITERATE_RDEV(mddev,rdev,rtmp) | |
4187 | if (rdev->raid_disk < 0 | |
b2d444d7 | 4188 | && !test_bit(Faulty, &rdev->flags)) { |
86e6ffdd N |
4189 | if (mddev->pers->hot_add_disk(mddev,rdev)) { |
4190 | char nm[20]; | |
4191 | sprintf(nm, "rd%d", rdev->raid_disk); | |
4192 | sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); | |
1da177e4 | 4193 | spares++; |
86e6ffdd | 4194 | } else |
1da177e4 LT |
4195 | break; |
4196 | } | |
4197 | } | |
4198 | ||
24dd469d N |
4199 | if (spares) { |
4200 | clear_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4201 | clear_bit(MD_RECOVERY_CHECK, &mddev->recovery); | |
4202 | } else if (mddev->recovery_cp < MaxSector) { | |
4203 | set_bit(MD_RECOVERY_SYNC, &mddev->recovery); | |
4204 | } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) | |
4205 | /* nothing to be done ... */ | |
1da177e4 | 4206 | goto unlock; |
24dd469d | 4207 | |
1da177e4 LT |
4208 | if (mddev->pers->sync_request) { |
4209 | set_bit(MD_RECOVERY_RUNNING, &mddev->recovery); | |
a654b9d8 N |
4210 | if (spares && mddev->bitmap && ! mddev->bitmap->file) { |
4211 | /* We are adding a device or devices to an array | |
4212 | * which has the bitmap stored on all devices. | |
4213 | * So make sure all bitmap pages get written | |
4214 | */ | |
4215 | bitmap_write_all(mddev->bitmap); | |
4216 | } | |
1da177e4 LT |
4217 | mddev->sync_thread = md_register_thread(md_do_sync, |
4218 | mddev, | |
4219 | "%s_resync"); | |
4220 | if (!mddev->sync_thread) { | |
4221 | printk(KERN_ERR "%s: could not start resync" | |
4222 | " thread...\n", | |
4223 | mdname(mddev)); | |
4224 | /* leave the spares where they are, it shouldn't hurt */ | |
4225 | mddev->recovery = 0; | |
4226 | } else { | |
4227 | md_wakeup_thread(mddev->sync_thread); | |
4228 | } | |
4229 | } | |
4230 | unlock: | |
4231 | mddev_unlock(mddev); | |
4232 | } | |
4233 | } | |
4234 | ||
75c96f85 AB |
4235 | static int md_notify_reboot(struct notifier_block *this, |
4236 | unsigned long code, void *x) | |
1da177e4 LT |
4237 | { |
4238 | struct list_head *tmp; | |
4239 | mddev_t *mddev; | |
4240 | ||
4241 | if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) { | |
4242 | ||
4243 | printk(KERN_INFO "md: stopping all md devices.\n"); | |
4244 | ||
4245 | ITERATE_MDDEV(mddev,tmp) | |
4246 | if (mddev_trylock(mddev)==0) | |
4247 | do_md_stop (mddev, 1); | |
4248 | /* | |
4249 | * certain more exotic SCSI devices are known to be | |
4250 | * volatile wrt too early system reboots. While the | |
4251 | * right place to handle this issue is the given | |
4252 | * driver, we do want to have a safe RAID driver ... | |
4253 | */ | |
4254 | mdelay(1000*1); | |
4255 | } | |
4256 | return NOTIFY_DONE; | |
4257 | } | |
4258 | ||
75c96f85 | 4259 | static struct notifier_block md_notifier = { |
1da177e4 LT |
4260 | .notifier_call = md_notify_reboot, |
4261 | .next = NULL, | |
4262 | .priority = INT_MAX, /* before any real devices */ | |
4263 | }; | |
4264 | ||
4265 | static void md_geninit(void) | |
4266 | { | |
4267 | struct proc_dir_entry *p; | |
4268 | ||
4269 | dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t)); | |
4270 | ||
4271 | p = create_proc_entry("mdstat", S_IRUGO, NULL); | |
4272 | if (p) | |
4273 | p->proc_fops = &md_seq_fops; | |
4274 | } | |
4275 | ||
75c96f85 | 4276 | static int __init md_init(void) |
1da177e4 LT |
4277 | { |
4278 | int minor; | |
4279 | ||
4280 | printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d," | |
4281 | " MD_SB_DISKS=%d\n", | |
4282 | MD_MAJOR_VERSION, MD_MINOR_VERSION, | |
4283 | MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS); | |
32a7627c N |
4284 | printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR, |
4285 | BITMAP_MINOR); | |
1da177e4 LT |
4286 | |
4287 | if (register_blkdev(MAJOR_NR, "md")) | |
4288 | return -1; | |
4289 | if ((mdp_major=register_blkdev(0, "mdp"))<=0) { | |
4290 | unregister_blkdev(MAJOR_NR, "md"); | |
4291 | return -1; | |
4292 | } | |
4293 | devfs_mk_dir("md"); | |
4294 | blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE, | |
4295 | md_probe, NULL, NULL); | |
4296 | blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE, | |
4297 | md_probe, NULL, NULL); | |
4298 | ||
4299 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4300 | devfs_mk_bdev(MKDEV(MAJOR_NR, minor), | |
4301 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4302 | "md/%d", minor); | |
4303 | ||
4304 | for (minor=0; minor < MAX_MD_DEVS; ++minor) | |
4305 | devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift), | |
4306 | S_IFBLK|S_IRUSR|S_IWUSR, | |
4307 | "md/mdp%d", minor); | |
4308 | ||
4309 | ||
4310 | register_reboot_notifier(&md_notifier); | |
4311 | raid_table_header = register_sysctl_table(raid_root_table, 1); | |
4312 | ||
4313 | md_geninit(); | |
4314 | return (0); | |
4315 | } | |
4316 | ||
4317 | ||
4318 | #ifndef MODULE | |
4319 | ||
4320 | /* | |
4321 | * Searches all registered partitions for autorun RAID arrays | |
4322 | * at boot time. | |
4323 | */ | |
4324 | static dev_t detected_devices[128]; | |
4325 | static int dev_cnt; | |
4326 | ||
4327 | void md_autodetect_dev(dev_t dev) | |
4328 | { | |
4329 | if (dev_cnt >= 0 && dev_cnt < 127) | |
4330 | detected_devices[dev_cnt++] = dev; | |
4331 | } | |
4332 | ||
4333 | ||
4334 | static void autostart_arrays(int part) | |
4335 | { | |
4336 | mdk_rdev_t *rdev; | |
4337 | int i; | |
4338 | ||
4339 | printk(KERN_INFO "md: Autodetecting RAID arrays.\n"); | |
4340 | ||
4341 | for (i = 0; i < dev_cnt; i++) { | |
4342 | dev_t dev = detected_devices[i]; | |
4343 | ||
4344 | rdev = md_import_device(dev,0, 0); | |
4345 | if (IS_ERR(rdev)) | |
4346 | continue; | |
4347 | ||
b2d444d7 | 4348 | if (test_bit(Faulty, &rdev->flags)) { |
1da177e4 LT |
4349 | MD_BUG(); |
4350 | continue; | |
4351 | } | |
4352 | list_add(&rdev->same_set, &pending_raid_disks); | |
4353 | } | |
4354 | dev_cnt = 0; | |
4355 | ||
4356 | autorun_devices(part); | |
4357 | } | |
4358 | ||
4359 | #endif | |
4360 | ||
4361 | static __exit void md_exit(void) | |
4362 | { | |
4363 | mddev_t *mddev; | |
4364 | struct list_head *tmp; | |
4365 | int i; | |
4366 | blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS); | |
4367 | blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift); | |
4368 | for (i=0; i < MAX_MD_DEVS; i++) | |
4369 | devfs_remove("md/%d", i); | |
4370 | for (i=0; i < MAX_MD_DEVS; i++) | |
4371 | devfs_remove("md/d%d", i); | |
4372 | ||
4373 | devfs_remove("md"); | |
4374 | ||
4375 | unregister_blkdev(MAJOR_NR,"md"); | |
4376 | unregister_blkdev(mdp_major, "mdp"); | |
4377 | unregister_reboot_notifier(&md_notifier); | |
4378 | unregister_sysctl_table(raid_table_header); | |
4379 | remove_proc_entry("mdstat", NULL); | |
4380 | ITERATE_MDDEV(mddev,tmp) { | |
4381 | struct gendisk *disk = mddev->gendisk; | |
4382 | if (!disk) | |
4383 | continue; | |
4384 | export_array(mddev); | |
4385 | del_gendisk(disk); | |
4386 | put_disk(disk); | |
4387 | mddev->gendisk = NULL; | |
4388 | mddev_put(mddev); | |
4389 | } | |
4390 | } | |
4391 | ||
4392 | module_init(md_init) | |
4393 | module_exit(md_exit) | |
4394 | ||
4395 | EXPORT_SYMBOL(register_md_personality); | |
4396 | EXPORT_SYMBOL(unregister_md_personality); | |
4397 | EXPORT_SYMBOL(md_error); | |
4398 | EXPORT_SYMBOL(md_done_sync); | |
4399 | EXPORT_SYMBOL(md_write_start); | |
4400 | EXPORT_SYMBOL(md_write_end); | |
1da177e4 LT |
4401 | EXPORT_SYMBOL(md_register_thread); |
4402 | EXPORT_SYMBOL(md_unregister_thread); | |
4403 | EXPORT_SYMBOL(md_wakeup_thread); | |
4404 | EXPORT_SYMBOL(md_print_devices); | |
4405 | EXPORT_SYMBOL(md_check_recovery); | |
4406 | MODULE_LICENSE("GPL"); | |
aa1595e9 | 4407 | MODULE_ALIAS("md"); |
72008652 | 4408 | MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR); |