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