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[PATCH] md: convert 'faulty' and 'in_sync' fields to bits in 'flags' field
[linux-2.6/x86.git] / drivers / md / md.c
blob9dfa063d1c6ac2da94bd99667b71db130a91608d
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 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
24
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
28 any later version.
29
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
33 */
34
35 #include <linux/module.h>
36 #include <linux/config.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/devfs_fs_kernel.h>
43 #include <linux/buffer_head.h> /* for invalidate_bdev */
44 #include <linux/suspend.h>
45
46 #include <linux/init.h>
47
48 #include <linux/file.h>
49
50 #ifdef CONFIG_KMOD
51 #include <linux/kmod.h>
52 #endif
53
54 #include <asm/unaligned.h>
55
56 #define MAJOR_NR MD_MAJOR
57 #define MD_DRIVER
58
59 /* 63 partitions with the alternate major number (mdp) */
60 #define MdpMinorShift 6
61
62 #define DEBUG 0
63 #define dprintk(x...) ((void)(DEBUG && printk(x)))
64
65
66 #ifndef MODULE
67 static void autostart_arrays (int part);
68 #endif
69
70 static mdk_personality_t *pers[MAX_PERSONALITY];
71 static DEFINE_SPINLOCK(pers_lock);
72
73 /*
74 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
75 * is 1000 KB/sec, so the extra system load does not show up that much.
76 * Increase it if you want to have more _guaranteed_ speed. Note that
77 * the RAID driver will use the maximum available bandwidth if the IO
78 * subsystem is idle. There is also an 'absolute maximum' reconstruction
79 * speed limit - in case reconstruction slows down your system despite
80 * idle IO detection.
81 *
82 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
83 */
84
85 static int sysctl_speed_limit_min = 1000;
86 static int sysctl_speed_limit_max = 200000;
87
88 static struct ctl_table_header *raid_table_header;
89
90 static ctl_table raid_table[] = {
91 {
92 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
93 .procname = "speed_limit_min",
94 .data = &sysctl_speed_limit_min,
95 .maxlen = sizeof(int),
96 .mode = 0644,
97 .proc_handler = &proc_dointvec,
98 },
99 {
100 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
101 .procname = "speed_limit_max",
102 .data = &sysctl_speed_limit_max,
103 .maxlen = sizeof(int),
104 .mode = 0644,
105 .proc_handler = &proc_dointvec,
106 },
107 { .ctl_name = 0 }
108 };
109
110 static ctl_table raid_dir_table[] = {
111 {
112 .ctl_name = DEV_RAID,
113 .procname = "raid",
114 .maxlen = 0,
115 .mode = 0555,
116 .child = raid_table,
117 },
118 { .ctl_name = 0 }
119 };
120
121 static ctl_table raid_root_table[] = {
122 {
123 .ctl_name = CTL_DEV,
124 .procname = "dev",
125 .maxlen = 0,
126 .mode = 0555,
127 .child = raid_dir_table,
128 },
129 { .ctl_name = 0 }
130 };
131
132 static struct block_device_operations md_fops;
133
134 /*
135 * Enables to iterate over all existing md arrays
136 * all_mddevs_lock protects this list.
137 */
138 static LIST_HEAD(all_mddevs);
139 static DEFINE_SPINLOCK(all_mddevs_lock);
140
141
142 /*
143 * iterates through all used mddevs in the system.
144 * We take care to grab the all_mddevs_lock whenever navigating
145 * the list, and to always hold a refcount when unlocked.
146 * Any code which breaks out of this loop while own
147 * a reference to the current mddev and must mddev_put it.
148 */
149 #define ITERATE_MDDEV(mddev,tmp) \
150 \
151 for (({ spin_lock(&all_mddevs_lock); \
152 tmp = all_mddevs.next; \
153 mddev = NULL;}); \
154 ({ if (tmp != &all_mddevs) \
155 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
156 spin_unlock(&all_mddevs_lock); \
157 if (mddev) mddev_put(mddev); \
158 mddev = list_entry(tmp, mddev_t, all_mddevs); \
159 tmp != &all_mddevs;}); \
160 ({ spin_lock(&all_mddevs_lock); \
161 tmp = tmp->next;}) \
162 )
163
164
165 static int md_fail_request (request_queue_t *q, struct bio *bio)
166 {
167 bio_io_error(bio, bio->bi_size);
168 return 0;
169 }
170
171 static inline mddev_t *mddev_get(mddev_t *mddev)
172 {
173 atomic_inc(&mddev->active);
174 return mddev;
175 }
176
177 static void mddev_put(mddev_t *mddev)
178 {
179 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
180 return;
181 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
182 list_del(&mddev->all_mddevs);
183 blk_put_queue(mddev->queue);
184 kobject_unregister(&mddev->kobj);
185 }
186 spin_unlock(&all_mddevs_lock);
187 }
188
189 static mddev_t * mddev_find(dev_t unit)
190 {
191 mddev_t *mddev, *new = NULL;
192
193 retry:
194 spin_lock(&all_mddevs_lock);
195 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
196 if (mddev->unit == unit) {
197 mddev_get(mddev);
198 spin_unlock(&all_mddevs_lock);
199 kfree(new);
200 return mddev;
201 }
202
203 if (new) {
204 list_add(&new->all_mddevs, &all_mddevs);
205 spin_unlock(&all_mddevs_lock);
206 return new;
207 }
208 spin_unlock(&all_mddevs_lock);
209
210 new = (mddev_t *) kmalloc(sizeof(*new), GFP_KERNEL);
211 if (!new)
212 return NULL;
213
214 memset(new, 0, sizeof(*new));
215
216 new->unit = unit;
217 if (MAJOR(unit) == MD_MAJOR)
218 new->md_minor = MINOR(unit);
219 else
220 new->md_minor = MINOR(unit) >> MdpMinorShift;
221
222 init_MUTEX(&new->reconfig_sem);
223 INIT_LIST_HEAD(&new->disks);
224 INIT_LIST_HEAD(&new->all_mddevs);
225 init_timer(&new->safemode_timer);
226 atomic_set(&new->active, 1);
227 spin_lock_init(&new->write_lock);
228 init_waitqueue_head(&new->sb_wait);
229
230 new->queue = blk_alloc_queue(GFP_KERNEL);
231 if (!new->queue) {
232 kfree(new);
233 return NULL;
234 }
235
236 blk_queue_make_request(new->queue, md_fail_request);
237
238 goto retry;
239 }
240
241 static inline int mddev_lock(mddev_t * mddev)
242 {
243 return down_interruptible(&mddev->reconfig_sem);
244 }
245
246 static inline void mddev_lock_uninterruptible(mddev_t * mddev)
247 {
248 down(&mddev->reconfig_sem);
249 }
250
251 static inline int mddev_trylock(mddev_t * mddev)
252 {
253 return down_trylock(&mddev->reconfig_sem);
254 }
255
256 static inline void mddev_unlock(mddev_t * mddev)
257 {
258 up(&mddev->reconfig_sem);
259
260 md_wakeup_thread(mddev->thread);
261 }
262
263 mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
264 {
265 mdk_rdev_t * rdev;
266 struct list_head *tmp;
267
268 ITERATE_RDEV(mddev,rdev,tmp) {
269 if (rdev->desc_nr == nr)
270 return rdev;
271 }
272 return NULL;
273 }
274
275 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
276 {
277 struct list_head *tmp;
278 mdk_rdev_t *rdev;
279
280 ITERATE_RDEV(mddev,rdev,tmp) {
281 if (rdev->bdev->bd_dev == dev)
282 return rdev;
283 }
284 return NULL;
285 }
286
287 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
288 {
289 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
290 return MD_NEW_SIZE_BLOCKS(size);
291 }
292
293 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
294 {
295 sector_t size;
296
297 size = rdev->sb_offset;
298
299 if (chunk_size)
300 size &= ~((sector_t)chunk_size/1024 - 1);
301 return size;
302 }
303
304 static int alloc_disk_sb(mdk_rdev_t * rdev)
305 {
306 if (rdev->sb_page)
307 MD_BUG();
308
309 rdev->sb_page = alloc_page(GFP_KERNEL);
310 if (!rdev->sb_page) {
311 printk(KERN_ALERT "md: out of memory.\n");
312 return -EINVAL;
313 }
314
315 return 0;
316 }
317
318 static void free_disk_sb(mdk_rdev_t * rdev)
319 {
320 if (rdev->sb_page) {
321 page_cache_release(rdev->sb_page);
322 rdev->sb_loaded = 0;
323 rdev->sb_page = NULL;
324 rdev->sb_offset = 0;
325 rdev->size = 0;
326 }
327 }
328
329
330 static int super_written(struct bio *bio, unsigned int bytes_done, int error)
331 {
332 mdk_rdev_t *rdev = bio->bi_private;
333 if (bio->bi_size)
334 return 1;
335
336 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
337 md_error(rdev->mddev, rdev);
338
339 if (atomic_dec_and_test(&rdev->mddev->pending_writes))
340 wake_up(&rdev->mddev->sb_wait);
341 bio_put(bio);
342 return 0;
343 }
344
345 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
346 sector_t sector, int size, struct page *page)
347 {
348 /* write first size bytes of page to sector of rdev
349 * Increment mddev->pending_writes before returning
350 * and decrement it on completion, waking up sb_wait
351 * if zero is reached.
352 * If an error occurred, call md_error
353 */
354 struct bio *bio = bio_alloc(GFP_NOIO, 1);
355
356 bio->bi_bdev = rdev->bdev;
357 bio->bi_sector = sector;
358 bio_add_page(bio, page, size, 0);
359 bio->bi_private = rdev;
360 bio->bi_end_io = super_written;
361 atomic_inc(&mddev->pending_writes);
362 submit_bio((1<<BIO_RW)|(1<<BIO_RW_SYNC), bio);
363 }
364
365 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
366 {
367 if (bio->bi_size)
368 return 1;
369
370 complete((struct completion*)bio->bi_private);
371 return 0;
372 }
373
374 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
375 struct page *page, int rw)
376 {
377 struct bio *bio = bio_alloc(GFP_NOIO, 1);
378 struct completion event;
379 int ret;
380
381 rw |= (1 << BIO_RW_SYNC);
382
383 bio->bi_bdev = bdev;
384 bio->bi_sector = sector;
385 bio_add_page(bio, page, size, 0);
386 init_completion(&event);
387 bio->bi_private = &event;
388 bio->bi_end_io = bi_complete;
389 submit_bio(rw, bio);
390 wait_for_completion(&event);
391
392 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
393 bio_put(bio);
394 return ret;
395 }
396
397 static int read_disk_sb(mdk_rdev_t * rdev, int size)
398 {
399 char b[BDEVNAME_SIZE];
400 if (!rdev->sb_page) {
401 MD_BUG();
402 return -EINVAL;
403 }
404 if (rdev->sb_loaded)
405 return 0;
406
407
408 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
409 goto fail;
410 rdev->sb_loaded = 1;
411 return 0;
412
413 fail:
414 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
415 bdevname(rdev->bdev,b));
416 return -EINVAL;
417 }
418
419 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
420 {
421 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
422 (sb1->set_uuid1 == sb2->set_uuid1) &&
423 (sb1->set_uuid2 == sb2->set_uuid2) &&
424 (sb1->set_uuid3 == sb2->set_uuid3))
425
426 return 1;
427
428 return 0;
429 }
430
431
432 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
433 {
434 int ret;
435 mdp_super_t *tmp1, *tmp2;
436
437 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
438 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
439
440 if (!tmp1 || !tmp2) {
441 ret = 0;
442 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
443 goto abort;
444 }
445
446 *tmp1 = *sb1;
447 *tmp2 = *sb2;
448
449 /*
450 * nr_disks is not constant
451 */
452 tmp1->nr_disks = 0;
453 tmp2->nr_disks = 0;
454
455 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
456 ret = 0;
457 else
458 ret = 1;
459
460 abort:
461 kfree(tmp1);
462 kfree(tmp2);
463 return ret;
464 }
465
466 static unsigned int calc_sb_csum(mdp_super_t * sb)
467 {
468 unsigned int disk_csum, csum;
469
470 disk_csum = sb->sb_csum;
471 sb->sb_csum = 0;
472 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
473 sb->sb_csum = disk_csum;
474 return csum;
475 }
476
477
478 /*
479 * Handle superblock details.
480 * We want to be able to handle multiple superblock formats
481 * so we have a common interface to them all, and an array of
482 * different handlers.
483 * We rely on user-space to write the initial superblock, and support
484 * reading and updating of superblocks.
485 * Interface methods are:
486 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
487 * loads and validates a superblock on dev.
488 * if refdev != NULL, compare superblocks on both devices
489 * Return:
490 * 0 - dev has a superblock that is compatible with refdev
491 * 1 - dev has a superblock that is compatible and newer than refdev
492 * so dev should be used as the refdev in future
493 * -EINVAL superblock incompatible or invalid
494 * -othererror e.g. -EIO
495 *
496 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
497 * Verify that dev is acceptable into mddev.
498 * The first time, mddev->raid_disks will be 0, and data from
499 * dev should be merged in. Subsequent calls check that dev
500 * is new enough. Return 0 or -EINVAL
501 *
502 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
503 * Update the superblock for rdev with data in mddev
504 * This does not write to disc.
505 *
506 */
507
508 struct super_type {
509 char *name;
510 struct module *owner;
511 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
512 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
513 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
514 };
515
516 /*
517 * load_super for 0.90.0
518 */
519 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
520 {
521 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
522 mdp_super_t *sb;
523 int ret;
524 sector_t sb_offset;
525
526 /*
527 * Calculate the position of the superblock,
528 * it's at the end of the disk.
529 *
530 * It also happens to be a multiple of 4Kb.
531 */
532 sb_offset = calc_dev_sboffset(rdev->bdev);
533 rdev->sb_offset = sb_offset;
534
535 ret = read_disk_sb(rdev, MD_SB_BYTES);
536 if (ret) return ret;
537
538 ret = -EINVAL;
539
540 bdevname(rdev->bdev, b);
541 sb = (mdp_super_t*)page_address(rdev->sb_page);
542
543 if (sb->md_magic != MD_SB_MAGIC) {
544 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
545 b);
546 goto abort;
547 }
548
549 if (sb->major_version != 0 ||
550 sb->minor_version != 90) {
551 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
552 sb->major_version, sb->minor_version,
553 b);
554 goto abort;
555 }
556
557 if (sb->raid_disks <= 0)
558 goto abort;
559
560 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
561 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
562 b);
563 goto abort;
564 }
565
566 rdev->preferred_minor = sb->md_minor;
567 rdev->data_offset = 0;
568 rdev->sb_size = MD_SB_BYTES;
569
570 if (sb->level == LEVEL_MULTIPATH)
571 rdev->desc_nr = -1;
572 else
573 rdev->desc_nr = sb->this_disk.number;
574
575 if (refdev == 0)
576 ret = 1;
577 else {
578 __u64 ev1, ev2;
579 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
580 if (!uuid_equal(refsb, sb)) {
581 printk(KERN_WARNING "md: %s has different UUID to %s\n",
582 b, bdevname(refdev->bdev,b2));
583 goto abort;
584 }
585 if (!sb_equal(refsb, sb)) {
586 printk(KERN_WARNING "md: %s has same UUID"
587 " but different superblock to %s\n",
588 b, bdevname(refdev->bdev, b2));
589 goto abort;
590 }
591 ev1 = md_event(sb);
592 ev2 = md_event(refsb);
593 if (ev1 > ev2)
594 ret = 1;
595 else
596 ret = 0;
597 }
598 rdev->size = calc_dev_size(rdev, sb->chunk_size);
599
600 abort:
601 return ret;
602 }
603
604 /*
605 * validate_super for 0.90.0
606 */
607 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
608 {
609 mdp_disk_t *desc;
610 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
611
612 rdev->raid_disk = -1;
613 rdev->flags = 0;
614 if (mddev->raid_disks == 0) {
615 mddev->major_version = 0;
616 mddev->minor_version = sb->minor_version;
617 mddev->patch_version = sb->patch_version;
618 mddev->persistent = ! sb->not_persistent;
619 mddev->chunk_size = sb->chunk_size;
620 mddev->ctime = sb->ctime;
621 mddev->utime = sb->utime;
622 mddev->level = sb->level;
623 mddev->layout = sb->layout;
624 mddev->raid_disks = sb->raid_disks;
625 mddev->size = sb->size;
626 mddev->events = md_event(sb);
627 mddev->bitmap_offset = 0;
628 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
629
630 if (sb->state & (1<<MD_SB_CLEAN))
631 mddev->recovery_cp = MaxSector;
632 else {
633 if (sb->events_hi == sb->cp_events_hi &&
634 sb->events_lo == sb->cp_events_lo) {
635 mddev->recovery_cp = sb->recovery_cp;
636 } else
637 mddev->recovery_cp = 0;
638 }
639
640 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
641 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
642 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
643 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
644
645 mddev->max_disks = MD_SB_DISKS;
646
647 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
648 mddev->bitmap_file == NULL) {
649 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6) {
650 /* FIXME use a better test */
651 printk(KERN_WARNING "md: bitmaps only support for raid1\n");
652 return -EINVAL;
653 }
654 mddev->bitmap_offset = mddev->default_bitmap_offset;
655 }
656
657 } else if (mddev->pers == NULL) {
658 /* Insist on good event counter while assembling */
659 __u64 ev1 = md_event(sb);
660 ++ev1;
661 if (ev1 < mddev->events)
662 return -EINVAL;
663 } else if (mddev->bitmap) {
664 /* if adding to array with a bitmap, then we can accept an
665 * older device ... but not too old.
666 */
667 __u64 ev1 = md_event(sb);
668 if (ev1 < mddev->bitmap->events_cleared)
669 return 0;
670 } else /* just a hot-add of a new device, leave raid_disk at -1 */
671 return 0;
672
673 if (mddev->level != LEVEL_MULTIPATH) {
674 desc = sb->disks + rdev->desc_nr;
675
676 if (desc->state & (1<<MD_DISK_FAULTY))
677 set_bit(Faulty, &rdev->flags);
678 else if (desc->state & (1<<MD_DISK_SYNC) &&
679 desc->raid_disk < mddev->raid_disks) {
680 set_bit(In_sync, &rdev->flags);
681 rdev->raid_disk = desc->raid_disk;
682 }
683 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
684 set_bit(WriteMostly, &rdev->flags);
685 } else /* MULTIPATH are always insync */
686 set_bit(In_sync, &rdev->flags);
687 return 0;
688 }
689
690 /*
691 * sync_super for 0.90.0
692 */
693 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
694 {
695 mdp_super_t *sb;
696 struct list_head *tmp;
697 mdk_rdev_t *rdev2;
698 int next_spare = mddev->raid_disks;
699 char nm[20];
700
701 /* make rdev->sb match mddev data..
702 *
703 * 1/ zero out disks
704 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
705 * 3/ any empty disks < next_spare become removed
706 *
707 * disks[0] gets initialised to REMOVED because
708 * we cannot be sure from other fields if it has
709 * been initialised or not.
710 */
711 int i;
712 int active=0, working=0,failed=0,spare=0,nr_disks=0;
713 unsigned int fixdesc=0;
714
715 rdev->sb_size = MD_SB_BYTES;
716
717 sb = (mdp_super_t*)page_address(rdev->sb_page);
718
719 memset(sb, 0, sizeof(*sb));
720
721 sb->md_magic = MD_SB_MAGIC;
722 sb->major_version = mddev->major_version;
723 sb->minor_version = mddev->minor_version;
724 sb->patch_version = mddev->patch_version;
725 sb->gvalid_words = 0; /* ignored */
726 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
727 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
728 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
729 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
730
731 sb->ctime = mddev->ctime;
732 sb->level = mddev->level;
733 sb->size = mddev->size;
734 sb->raid_disks = mddev->raid_disks;
735 sb->md_minor = mddev->md_minor;
736 sb->not_persistent = !mddev->persistent;
737 sb->utime = mddev->utime;
738 sb->state = 0;
739 sb->events_hi = (mddev->events>>32);
740 sb->events_lo = (u32)mddev->events;
741
742 if (mddev->in_sync)
743 {
744 sb->recovery_cp = mddev->recovery_cp;
745 sb->cp_events_hi = (mddev->events>>32);
746 sb->cp_events_lo = (u32)mddev->events;
747 if (mddev->recovery_cp == MaxSector)
748 sb->state = (1<< MD_SB_CLEAN);
749 } else
750 sb->recovery_cp = 0;
751
752 sb->layout = mddev->layout;
753 sb->chunk_size = mddev->chunk_size;
754
755 if (mddev->bitmap && mddev->bitmap_file == NULL)
756 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
757
758 sb->disks[0].state = (1<<MD_DISK_REMOVED);
759 ITERATE_RDEV(mddev,rdev2,tmp) {
760 mdp_disk_t *d;
761 int desc_nr;
762 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
763 && !test_bit(Faulty, &rdev2->flags))
764 desc_nr = rdev2->raid_disk;
765 else
766 desc_nr = next_spare++;
767 if (desc_nr != rdev2->desc_nr) {
768 fixdesc |= (1 << desc_nr);
769 rdev2->desc_nr = desc_nr;
770 if (rdev2->raid_disk >= 0) {
771 sprintf(nm, "rd%d", rdev2->raid_disk);
772 sysfs_remove_link(&mddev->kobj, nm);
773 }
774 sysfs_remove_link(&rdev2->kobj, "block");
775 kobject_del(&rdev2->kobj);
776 }
777 d = &sb->disks[rdev2->desc_nr];
778 nr_disks++;
779 d->number = rdev2->desc_nr;
780 d->major = MAJOR(rdev2->bdev->bd_dev);
781 d->minor = MINOR(rdev2->bdev->bd_dev);
782 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
783 && !test_bit(Faulty, &rdev2->flags))
784 d->raid_disk = rdev2->raid_disk;
785 else
786 d->raid_disk = rdev2->desc_nr; /* compatibility */
787 if (test_bit(Faulty, &rdev2->flags)) {
788 d->state = (1<<MD_DISK_FAULTY);
789 failed++;
790 } else if (test_bit(In_sync, &rdev2->flags)) {
791 d->state = (1<<MD_DISK_ACTIVE);
792 d->state |= (1<<MD_DISK_SYNC);
793 active++;
794 working++;
795 } else {
796 d->state = 0;
797 spare++;
798 working++;
799 }
800 if (test_bit(WriteMostly, &rdev2->flags))
801 d->state |= (1<<MD_DISK_WRITEMOSTLY);
802 }
803 if (fixdesc)
804 ITERATE_RDEV(mddev,rdev2,tmp)
805 if (fixdesc & (1<<rdev2->desc_nr)) {
806 snprintf(rdev2->kobj.name, KOBJ_NAME_LEN, "dev%d",
807 rdev2->desc_nr);
808 /* kobject_add gets a ref on the parent, so
809 * we have to drop the one we already have
810 */
811 kobject_add(&rdev2->kobj);
812 kobject_put(rdev->kobj.parent);
813 sysfs_create_link(&rdev2->kobj,
814 &rdev2->bdev->bd_disk->kobj,
815 "block");
816 if (rdev2->raid_disk >= 0) {
817 sprintf(nm, "rd%d", rdev2->raid_disk);
818 sysfs_create_link(&mddev->kobj,
819 &rdev2->kobj, nm);
820 }
821 }
822 /* now set the "removed" and "faulty" bits on any missing devices */
823 for (i=0 ; i < mddev->raid_disks ; i++) {
824 mdp_disk_t *d = &sb->disks[i];
825 if (d->state == 0 && d->number == 0) {
826 d->number = i;
827 d->raid_disk = i;
828 d->state = (1<<MD_DISK_REMOVED);
829 d->state |= (1<<MD_DISK_FAULTY);
830 failed++;
831 }
832 }
833 sb->nr_disks = nr_disks;
834 sb->active_disks = active;
835 sb->working_disks = working;
836 sb->failed_disks = failed;
837 sb->spare_disks = spare;
838
839 sb->this_disk = sb->disks[rdev->desc_nr];
840 sb->sb_csum = calc_sb_csum(sb);
841 }
842
843 /*
844 * version 1 superblock
845 */
846
847 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
848 {
849 unsigned int disk_csum, csum;
850 unsigned long long newcsum;
851 int size = 256 + le32_to_cpu(sb->max_dev)*2;
852 unsigned int *isuper = (unsigned int*)sb;
853 int i;
854
855 disk_csum = sb->sb_csum;
856 sb->sb_csum = 0;
857 newcsum = 0;
858 for (i=0; size>=4; size -= 4 )
859 newcsum += le32_to_cpu(*isuper++);
860
861 if (size == 2)
862 newcsum += le16_to_cpu(*(unsigned short*) isuper);
863
864 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
865 sb->sb_csum = disk_csum;
866 return cpu_to_le32(csum);
867 }
868
869 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
870 {
871 struct mdp_superblock_1 *sb;
872 int ret;
873 sector_t sb_offset;
874 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
875 int bmask;
876
877 /*
878 * Calculate the position of the superblock.
879 * It is always aligned to a 4K boundary and
880 * depeding on minor_version, it can be:
881 * 0: At least 8K, but less than 12K, from end of device
882 * 1: At start of device
883 * 2: 4K from start of device.
884 */
885 switch(minor_version) {
886 case 0:
887 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
888 sb_offset -= 8*2;
889 sb_offset &= ~(sector_t)(4*2-1);
890 /* convert from sectors to K */
891 sb_offset /= 2;
892 break;
893 case 1:
894 sb_offset = 0;
895 break;
896 case 2:
897 sb_offset = 4;
898 break;
899 default:
900 return -EINVAL;
901 }
902 rdev->sb_offset = sb_offset;
903
904 /* superblock is rarely larger than 1K, but it can be larger,
905 * and it is safe to read 4k, so we do that
906 */
907 ret = read_disk_sb(rdev, 4096);
908 if (ret) return ret;
909
910
911 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
912
913 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
914 sb->major_version != cpu_to_le32(1) ||
915 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
916 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
917 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
918 return -EINVAL;
919
920 if (calc_sb_1_csum(sb) != sb->sb_csum) {
921 printk("md: invalid superblock checksum on %s\n",
922 bdevname(rdev->bdev,b));
923 return -EINVAL;
924 }
925 if (le64_to_cpu(sb->data_size) < 10) {
926 printk("md: data_size too small on %s\n",
927 bdevname(rdev->bdev,b));
928 return -EINVAL;
929 }
930 rdev->preferred_minor = 0xffff;
931 rdev->data_offset = le64_to_cpu(sb->data_offset);
932
933 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
934 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
935 if (rdev->sb_size & bmask)
936 rdev-> sb_size = (rdev->sb_size | bmask)+1;
937
938 if (refdev == 0)
939 return 1;
940 else {
941 __u64 ev1, ev2;
942 struct mdp_superblock_1 *refsb =
943 (struct mdp_superblock_1*)page_address(refdev->sb_page);
944
945 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
946 sb->level != refsb->level ||
947 sb->layout != refsb->layout ||
948 sb->chunksize != refsb->chunksize) {
949 printk(KERN_WARNING "md: %s has strangely different"
950 " superblock to %s\n",
951 bdevname(rdev->bdev,b),
952 bdevname(refdev->bdev,b2));
953 return -EINVAL;
954 }
955 ev1 = le64_to_cpu(sb->events);
956 ev2 = le64_to_cpu(refsb->events);
957
958 if (ev1 > ev2)
959 return 1;
960 }
961 if (minor_version)
962 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
963 else
964 rdev->size = rdev->sb_offset;
965 if (rdev->size < le64_to_cpu(sb->data_size)/2)
966 return -EINVAL;
967 rdev->size = le64_to_cpu(sb->data_size)/2;
968 if (le32_to_cpu(sb->chunksize))
969 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
970 return 0;
971 }
972
973 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
974 {
975 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
976
977 rdev->raid_disk = -1;
978 rdev->flags = 0;
979 if (mddev->raid_disks == 0) {
980 mddev->major_version = 1;
981 mddev->patch_version = 0;
982 mddev->persistent = 1;
983 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
984 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
985 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
986 mddev->level = le32_to_cpu(sb->level);
987 mddev->layout = le32_to_cpu(sb->layout);
988 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
989 mddev->size = le64_to_cpu(sb->size)/2;
990 mddev->events = le64_to_cpu(sb->events);
991 mddev->bitmap_offset = 0;
992 mddev->default_bitmap_offset = 0;
993 mddev->default_bitmap_offset = 1024;
994
995 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
996 memcpy(mddev->uuid, sb->set_uuid, 16);
997
998 mddev->max_disks = (4096-256)/2;
999
1000 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1001 mddev->bitmap_file == NULL ) {
1002 if (mddev->level != 1) {
1003 printk(KERN_WARNING "md: bitmaps only supported for raid1\n");
1004 return -EINVAL;
1005 }
1006 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1007 }
1008 } else if (mddev->pers == NULL) {
1009 /* Insist of good event counter while assembling */
1010 __u64 ev1 = le64_to_cpu(sb->events);
1011 ++ev1;
1012 if (ev1 < mddev->events)
1013 return -EINVAL;
1014 } else if (mddev->bitmap) {
1015 /* If adding to array with a bitmap, then we can accept an
1016 * older device, but not too old.
1017 */
1018 __u64 ev1 = le64_to_cpu(sb->events);
1019 if (ev1 < mddev->bitmap->events_cleared)
1020 return 0;
1021 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1022 return 0;
1023
1024 if (mddev->level != LEVEL_MULTIPATH) {
1025 int role;
1026 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1027 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1028 switch(role) {
1029 case 0xffff: /* spare */
1030 break;
1031 case 0xfffe: /* faulty */
1032 set_bit(Faulty, &rdev->flags);
1033 break;
1034 default:
1035 set_bit(In_sync, &rdev->flags);
1036 rdev->raid_disk = role;
1037 break;
1038 }
1039 if (sb->devflags & WriteMostly1)
1040 set_bit(WriteMostly, &rdev->flags);
1041 } else /* MULTIPATH are always insync */
1042 set_bit(In_sync, &rdev->flags);
1043
1044 return 0;
1045 }
1046
1047 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1048 {
1049 struct mdp_superblock_1 *sb;
1050 struct list_head *tmp;
1051 mdk_rdev_t *rdev2;
1052 int max_dev, i;
1053 /* make rdev->sb match mddev and rdev data. */
1054
1055 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1056
1057 sb->feature_map = 0;
1058 sb->pad0 = 0;
1059 memset(sb->pad1, 0, sizeof(sb->pad1));
1060 memset(sb->pad2, 0, sizeof(sb->pad2));
1061 memset(sb->pad3, 0, sizeof(sb->pad3));
1062
1063 sb->utime = cpu_to_le64((__u64)mddev->utime);
1064 sb->events = cpu_to_le64(mddev->events);
1065 if (mddev->in_sync)
1066 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1067 else
1068 sb->resync_offset = cpu_to_le64(0);
1069
1070 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1071 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1072 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1073 }
1074
1075 max_dev = 0;
1076 ITERATE_RDEV(mddev,rdev2,tmp)
1077 if (rdev2->desc_nr+1 > max_dev)
1078 max_dev = rdev2->desc_nr+1;
1079
1080 sb->max_dev = cpu_to_le32(max_dev);
1081 for (i=0; i<max_dev;i++)
1082 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1083
1084 ITERATE_RDEV(mddev,rdev2,tmp) {
1085 i = rdev2->desc_nr;
1086 if (test_bit(Faulty, &rdev2->flags))
1087 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1088 else if (test_bit(In_sync, &rdev2->flags))
1089 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1090 else
1091 sb->dev_roles[i] = cpu_to_le16(0xffff);
1092 }
1093
1094 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1095 sb->sb_csum = calc_sb_1_csum(sb);
1096 }
1097
1098
1099 static struct super_type super_types[] = {
1100 [0] = {
1101 .name = "0.90.0",
1102 .owner = THIS_MODULE,
1103 .load_super = super_90_load,
1104 .validate_super = super_90_validate,
1105 .sync_super = super_90_sync,
1106 },
1107 [1] = {
1108 .name = "md-1",
1109 .owner = THIS_MODULE,
1110 .load_super = super_1_load,
1111 .validate_super = super_1_validate,
1112 .sync_super = super_1_sync,
1113 },
1114 };
1115
1116 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1117 {
1118 struct list_head *tmp;
1119 mdk_rdev_t *rdev;
1120
1121 ITERATE_RDEV(mddev,rdev,tmp)
1122 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1123 return rdev;
1124
1125 return NULL;
1126 }
1127
1128 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1129 {
1130 struct list_head *tmp;
1131 mdk_rdev_t *rdev;
1132
1133 ITERATE_RDEV(mddev1,rdev,tmp)
1134 if (match_dev_unit(mddev2, rdev))
1135 return 1;
1136
1137 return 0;
1138 }
1139
1140 static LIST_HEAD(pending_raid_disks);
1141
1142 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1143 {
1144 mdk_rdev_t *same_pdev;
1145 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1146
1147 if (rdev->mddev) {
1148 MD_BUG();
1149 return -EINVAL;
1150 }
1151 same_pdev = match_dev_unit(mddev, rdev);
1152 if (same_pdev)
1153 printk(KERN_WARNING
1154 "%s: WARNING: %s appears to be on the same physical"
1155 " disk as %s. True\n protection against single-disk"
1156 " failure might be compromised.\n",
1157 mdname(mddev), bdevname(rdev->bdev,b),
1158 bdevname(same_pdev->bdev,b2));
1159
1160 /* Verify rdev->desc_nr is unique.
1161 * If it is -1, assign a free number, else
1162 * check number is not in use
1163 */
1164 if (rdev->desc_nr < 0) {
1165 int choice = 0;
1166 if (mddev->pers) choice = mddev->raid_disks;
1167 while (find_rdev_nr(mddev, choice))
1168 choice++;
1169 rdev->desc_nr = choice;
1170 } else {
1171 if (find_rdev_nr(mddev, rdev->desc_nr))
1172 return -EBUSY;
1173 }
1174
1175 list_add(&rdev->same_set, &mddev->disks);
1176 rdev->mddev = mddev;
1177 printk(KERN_INFO "md: bind<%s>\n", bdevname(rdev->bdev,b));
1178
1179 rdev->kobj.k_name = NULL;
1180 snprintf(rdev->kobj.name, KOBJ_NAME_LEN, "dev%d", rdev->desc_nr);
1181 rdev->kobj.parent = &mddev->kobj;
1182 kobject_add(&rdev->kobj);
1183
1184 sysfs_create_link(&rdev->kobj, &rdev->bdev->bd_disk->kobj, "block");
1185 return 0;
1186 }
1187
1188 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1189 {
1190 char b[BDEVNAME_SIZE];
1191 if (!rdev->mddev) {
1192 MD_BUG();
1193 return;
1194 }
1195 list_del_init(&rdev->same_set);
1196 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1197 rdev->mddev = NULL;
1198 sysfs_remove_link(&rdev->kobj, "block");
1199 kobject_del(&rdev->kobj);
1200 }
1201
1202 /*
1203 * prevent the device from being mounted, repartitioned or
1204 * otherwise reused by a RAID array (or any other kernel
1205 * subsystem), by bd_claiming the device.
1206 */
1207 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1208 {
1209 int err = 0;
1210 struct block_device *bdev;
1211 char b[BDEVNAME_SIZE];
1212
1213 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1214 if (IS_ERR(bdev)) {
1215 printk(KERN_ERR "md: could not open %s.\n",
1216 __bdevname(dev, b));
1217 return PTR_ERR(bdev);
1218 }
1219 err = bd_claim(bdev, rdev);
1220 if (err) {
1221 printk(KERN_ERR "md: could not bd_claim %s.\n",
1222 bdevname(bdev, b));
1223 blkdev_put(bdev);
1224 return err;
1225 }
1226 rdev->bdev = bdev;
1227 return err;
1228 }
1229
1230 static void unlock_rdev(mdk_rdev_t *rdev)
1231 {
1232 struct block_device *bdev = rdev->bdev;
1233 rdev->bdev = NULL;
1234 if (!bdev)
1235 MD_BUG();
1236 bd_release(bdev);
1237 blkdev_put(bdev);
1238 }
1239
1240 void md_autodetect_dev(dev_t dev);
1241
1242 static void export_rdev(mdk_rdev_t * rdev)
1243 {
1244 char b[BDEVNAME_SIZE];
1245 printk(KERN_INFO "md: export_rdev(%s)\n",
1246 bdevname(rdev->bdev,b));
1247 if (rdev->mddev)
1248 MD_BUG();
1249 free_disk_sb(rdev);
1250 list_del_init(&rdev->same_set);
1251 #ifndef MODULE
1252 md_autodetect_dev(rdev->bdev->bd_dev);
1253 #endif
1254 unlock_rdev(rdev);
1255 kobject_put(&rdev->kobj);
1256 }
1257
1258 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1259 {
1260 unbind_rdev_from_array(rdev);
1261 export_rdev(rdev);
1262 }
1263
1264 static void export_array(mddev_t *mddev)
1265 {
1266 struct list_head *tmp;
1267 mdk_rdev_t *rdev;
1268
1269 ITERATE_RDEV(mddev,rdev,tmp) {
1270 if (!rdev->mddev) {
1271 MD_BUG();
1272 continue;
1273 }
1274 kick_rdev_from_array(rdev);
1275 }
1276 if (!list_empty(&mddev->disks))
1277 MD_BUG();
1278 mddev->raid_disks = 0;
1279 mddev->major_version = 0;
1280 }
1281
1282 static void print_desc(mdp_disk_t *desc)
1283 {
1284 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1285 desc->major,desc->minor,desc->raid_disk,desc->state);
1286 }
1287
1288 static void print_sb(mdp_super_t *sb)
1289 {
1290 int i;
1291
1292 printk(KERN_INFO
1293 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1294 sb->major_version, sb->minor_version, sb->patch_version,
1295 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1296 sb->ctime);
1297 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1298 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1299 sb->md_minor, sb->layout, sb->chunk_size);
1300 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1301 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1302 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1303 sb->failed_disks, sb->spare_disks,
1304 sb->sb_csum, (unsigned long)sb->events_lo);
1305
1306 printk(KERN_INFO);
1307 for (i = 0; i < MD_SB_DISKS; i++) {
1308 mdp_disk_t *desc;
1309
1310 desc = sb->disks + i;
1311 if (desc->number || desc->major || desc->minor ||
1312 desc->raid_disk || (desc->state && (desc->state != 4))) {
1313 printk(" D %2d: ", i);
1314 print_desc(desc);
1315 }
1316 }
1317 printk(KERN_INFO "md: THIS: ");
1318 print_desc(&sb->this_disk);
1319
1320 }
1321
1322 static void print_rdev(mdk_rdev_t *rdev)
1323 {
1324 char b[BDEVNAME_SIZE];
1325 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1326 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1327 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1328 rdev->desc_nr);
1329 if (rdev->sb_loaded) {
1330 printk(KERN_INFO "md: rdev superblock:\n");
1331 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1332 } else
1333 printk(KERN_INFO "md: no rdev superblock!\n");
1334 }
1335
1336 void md_print_devices(void)
1337 {
1338 struct list_head *tmp, *tmp2;
1339 mdk_rdev_t *rdev;
1340 mddev_t *mddev;
1341 char b[BDEVNAME_SIZE];
1342
1343 printk("\n");
1344 printk("md: **********************************\n");
1345 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1346 printk("md: **********************************\n");
1347 ITERATE_MDDEV(mddev,tmp) {
1348
1349 if (mddev->bitmap)
1350 bitmap_print_sb(mddev->bitmap);
1351 else
1352 printk("%s: ", mdname(mddev));
1353 ITERATE_RDEV(mddev,rdev,tmp2)
1354 printk("<%s>", bdevname(rdev->bdev,b));
1355 printk("\n");
1356
1357 ITERATE_RDEV(mddev,rdev,tmp2)
1358 print_rdev(rdev);
1359 }
1360 printk("md: **********************************\n");
1361 printk("\n");
1362 }
1363
1364
1365 static void sync_sbs(mddev_t * mddev)
1366 {
1367 mdk_rdev_t *rdev;
1368 struct list_head *tmp;
1369
1370 ITERATE_RDEV(mddev,rdev,tmp) {
1371 super_types[mddev->major_version].
1372 sync_super(mddev, rdev);
1373 rdev->sb_loaded = 1;
1374 }
1375 }
1376
1377 static void md_update_sb(mddev_t * mddev)
1378 {
1379 int err;
1380 struct list_head *tmp;
1381 mdk_rdev_t *rdev;
1382 int sync_req;
1383
1384 repeat:
1385 spin_lock(&mddev->write_lock);
1386 sync_req = mddev->in_sync;
1387 mddev->utime = get_seconds();
1388 mddev->events ++;
1389
1390 if (!mddev->events) {
1391 /*
1392 * oops, this 64-bit counter should never wrap.
1393 * Either we are in around ~1 trillion A.C., assuming
1394 * 1 reboot per second, or we have a bug:
1395 */
1396 MD_BUG();
1397 mddev->events --;
1398 }
1399 mddev->sb_dirty = 2;
1400 sync_sbs(mddev);
1401
1402 /*
1403 * do not write anything to disk if using
1404 * nonpersistent superblocks
1405 */
1406 if (!mddev->persistent) {
1407 mddev->sb_dirty = 0;
1408 spin_unlock(&mddev->write_lock);
1409 wake_up(&mddev->sb_wait);
1410 return;
1411 }
1412 spin_unlock(&mddev->write_lock);
1413
1414 dprintk(KERN_INFO
1415 "md: updating %s RAID superblock on device (in sync %d)\n",
1416 mdname(mddev),mddev->in_sync);
1417
1418 err = bitmap_update_sb(mddev->bitmap);
1419 ITERATE_RDEV(mddev,rdev,tmp) {
1420 char b[BDEVNAME_SIZE];
1421 dprintk(KERN_INFO "md: ");
1422 if (test_bit(Faulty, &rdev->flags))
1423 dprintk("(skipping faulty ");
1424
1425 dprintk("%s ", bdevname(rdev->bdev,b));
1426 if (!test_bit(Faulty, &rdev->flags)) {
1427 md_super_write(mddev,rdev,
1428 rdev->sb_offset<<1, rdev->sb_size,
1429 rdev->sb_page);
1430 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1431 bdevname(rdev->bdev,b),
1432 (unsigned long long)rdev->sb_offset);
1433
1434 } else
1435 dprintk(")\n");
1436 if (mddev->level == LEVEL_MULTIPATH)
1437 /* only need to write one superblock... */
1438 break;
1439 }
1440 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
1441 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1442
1443 spin_lock(&mddev->write_lock);
1444 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
1445 /* have to write it out again */
1446 spin_unlock(&mddev->write_lock);
1447 goto repeat;
1448 }
1449 mddev->sb_dirty = 0;
1450 spin_unlock(&mddev->write_lock);
1451 wake_up(&mddev->sb_wait);
1452
1453 }
1454
1455 struct rdev_sysfs_entry {
1456 struct attribute attr;
1457 ssize_t (*show)(mdk_rdev_t *, char *);
1458 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1459 };
1460
1461 static ssize_t
1462 rdev_show_state(mdk_rdev_t *rdev, char *page)
1463 {
1464 char *sep = "";
1465 int len=0;
1466
1467 if (test_bit(Faulty, &rdev->flags)) {
1468 len+= sprintf(page+len, "%sfaulty",sep);
1469 sep = ",";
1470 }
1471 if (test_bit(In_sync, &rdev->flags)) {
1472 len += sprintf(page+len, "%sin_sync",sep);
1473 sep = ",";
1474 }
1475 if (!test_bit(Faulty, &rdev->flags) &&
1476 !test_bit(In_sync, &rdev->flags)) {
1477 len += sprintf(page+len, "%sspare", sep);
1478 sep = ",";
1479 }
1480 return len+sprintf(page+len, "\n");
1481 }
1482
1483 static struct rdev_sysfs_entry rdev_state = {
1484 .attr = {.name = "state", .mode = S_IRUGO },
1485 .show = rdev_show_state,
1486 };
1487
1488 static ssize_t
1489 rdev_show_super(mdk_rdev_t *rdev, char *page)
1490 {
1491 if (rdev->sb_loaded && rdev->sb_size) {
1492 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1493 return rdev->sb_size;
1494 } else
1495 return 0;
1496 }
1497 static struct rdev_sysfs_entry rdev_super = {
1498 .attr = {.name = "super", .mode = S_IRUGO },
1499 .show = rdev_show_super,
1500 };
1501 static struct attribute *rdev_default_attrs[] = {
1502 &rdev_state.attr,
1503 &rdev_super.attr,
1504 NULL,
1505 };
1506 static ssize_t
1507 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1508 {
1509 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1510 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1511
1512 if (!entry->show)
1513 return -EIO;
1514 return entry->show(rdev, page);
1515 }
1516
1517 static ssize_t
1518 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1519 const char *page, size_t length)
1520 {
1521 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1522 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1523
1524 if (!entry->store)
1525 return -EIO;
1526 return entry->store(rdev, page, length);
1527 }
1528
1529 static void rdev_free(struct kobject *ko)
1530 {
1531 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1532 kfree(rdev);
1533 }
1534 static struct sysfs_ops rdev_sysfs_ops = {
1535 .show = rdev_attr_show,
1536 .store = rdev_attr_store,
1537 };
1538 static struct kobj_type rdev_ktype = {
1539 .release = rdev_free,
1540 .sysfs_ops = &rdev_sysfs_ops,
1541 .default_attrs = rdev_default_attrs,
1542 };
1543
1544 /*
1545 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1546 *
1547 * mark the device faulty if:
1548 *
1549 * - the device is nonexistent (zero size)
1550 * - the device has no valid superblock
1551 *
1552 * a faulty rdev _never_ has rdev->sb set.
1553 */
1554 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1555 {
1556 char b[BDEVNAME_SIZE];
1557 int err;
1558 mdk_rdev_t *rdev;
1559 sector_t size;
1560
1561 rdev = (mdk_rdev_t *) kmalloc(sizeof(*rdev), GFP_KERNEL);
1562 if (!rdev) {
1563 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1564 return ERR_PTR(-ENOMEM);
1565 }
1566 memset(rdev, 0, sizeof(*rdev));
1567
1568 if ((err = alloc_disk_sb(rdev)))
1569 goto abort_free;
1570
1571 err = lock_rdev(rdev, newdev);
1572 if (err)
1573 goto abort_free;
1574
1575 rdev->kobj.parent = NULL;
1576 rdev->kobj.ktype = &rdev_ktype;
1577 kobject_init(&rdev->kobj);
1578
1579 rdev->desc_nr = -1;
1580 rdev->flags = 0;
1581 rdev->data_offset = 0;
1582 atomic_set(&rdev->nr_pending, 0);
1583 atomic_set(&rdev->read_errors, 0);
1584
1585 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1586 if (!size) {
1587 printk(KERN_WARNING
1588 "md: %s has zero or unknown size, marking faulty!\n",
1589 bdevname(rdev->bdev,b));
1590 err = -EINVAL;
1591 goto abort_free;
1592 }
1593
1594 if (super_format >= 0) {
1595 err = super_types[super_format].
1596 load_super(rdev, NULL, super_minor);
1597 if (err == -EINVAL) {
1598 printk(KERN_WARNING
1599 "md: %s has invalid sb, not importing!\n",
1600 bdevname(rdev->bdev,b));
1601 goto abort_free;
1602 }
1603 if (err < 0) {
1604 printk(KERN_WARNING
1605 "md: could not read %s's sb, not importing!\n",
1606 bdevname(rdev->bdev,b));
1607 goto abort_free;
1608 }
1609 }
1610 INIT_LIST_HEAD(&rdev->same_set);
1611
1612 return rdev;
1613
1614 abort_free:
1615 if (rdev->sb_page) {
1616 if (rdev->bdev)
1617 unlock_rdev(rdev);
1618 free_disk_sb(rdev);
1619 }
1620 kfree(rdev);
1621 return ERR_PTR(err);
1622 }
1623
1624 /*
1625 * Check a full RAID array for plausibility
1626 */
1627
1628
1629 static void analyze_sbs(mddev_t * mddev)
1630 {
1631 int i;
1632 struct list_head *tmp;
1633 mdk_rdev_t *rdev, *freshest;
1634 char b[BDEVNAME_SIZE];
1635
1636 freshest = NULL;
1637 ITERATE_RDEV(mddev,rdev,tmp)
1638 switch (super_types[mddev->major_version].
1639 load_super(rdev, freshest, mddev->minor_version)) {
1640 case 1:
1641 freshest = rdev;
1642 break;
1643 case 0:
1644 break;
1645 default:
1646 printk( KERN_ERR \
1647 "md: fatal superblock inconsistency in %s"
1648 " -- removing from array\n",
1649 bdevname(rdev->bdev,b));
1650 kick_rdev_from_array(rdev);
1651 }
1652
1653
1654 super_types[mddev->major_version].
1655 validate_super(mddev, freshest);
1656
1657 i = 0;
1658 ITERATE_RDEV(mddev,rdev,tmp) {
1659 if (rdev != freshest)
1660 if (super_types[mddev->major_version].
1661 validate_super(mddev, rdev)) {
1662 printk(KERN_WARNING "md: kicking non-fresh %s"
1663 " from array!\n",
1664 bdevname(rdev->bdev,b));
1665 kick_rdev_from_array(rdev);
1666 continue;
1667 }
1668 if (mddev->level == LEVEL_MULTIPATH) {
1669 rdev->desc_nr = i++;
1670 rdev->raid_disk = rdev->desc_nr;
1671 set_bit(In_sync, &rdev->flags);
1672 }
1673 }
1674
1675
1676
1677 if (mddev->recovery_cp != MaxSector &&
1678 mddev->level >= 1)
1679 printk(KERN_ERR "md: %s: raid array is not clean"
1680 " -- starting background reconstruction\n",
1681 mdname(mddev));
1682
1683 }
1684
1685 static ssize_t
1686 md_show_level(mddev_t *mddev, char *page)
1687 {
1688 mdk_personality_t *p = mddev->pers;
1689 if (p == NULL)
1690 return 0;
1691 if (mddev->level >= 0)
1692 return sprintf(page, "RAID-%d\n", mddev->level);
1693 else
1694 return sprintf(page, "%s\n", p->name);
1695 }
1696
1697 static struct md_sysfs_entry md_level = {
1698 .attr = {.name = "level", .mode = S_IRUGO },
1699 .show = md_show_level,
1700 };
1701
1702 static ssize_t
1703 md_show_rdisks(mddev_t *mddev, char *page)
1704 {
1705 return sprintf(page, "%d\n", mddev->raid_disks);
1706 }
1707
1708 static struct md_sysfs_entry md_raid_disks = {
1709 .attr = {.name = "raid_disks", .mode = S_IRUGO },
1710 .show = md_show_rdisks,
1711 };
1712
1713 static ssize_t
1714 md_show_scan(mddev_t *mddev, char *page)
1715 {
1716 char *type = "none";
1717 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1718 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
1719 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
1720 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
1721 type = "resync";
1722 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
1723 type = "check";
1724 else
1725 type = "repair";
1726 } else
1727 type = "recover";
1728 }
1729 return sprintf(page, "%s\n", type);
1730 }
1731
1732 static ssize_t
1733 md_store_scan(mddev_t *mddev, const char *page, size_t len)
1734 {
1735 int canscan=0;
1736
1737 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
1738 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
1739 return -EBUSY;
1740 down(&mddev->reconfig_sem);
1741 if (mddev->pers && mddev->pers->sync_request)
1742 canscan=1;
1743 up(&mddev->reconfig_sem);
1744 if (!canscan)
1745 return -EINVAL;
1746
1747 if (strcmp(page, "check")==0 || strcmp(page, "check\n")==0)
1748 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
1749 else if (strcmp(page, "repair")!=0 && strcmp(page, "repair\n")!=0)
1750 return -EINVAL;
1751 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
1752 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
1753 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
1754 md_wakeup_thread(mddev->thread);
1755 return len;
1756 }
1757
1758 static ssize_t
1759 md_show_mismatch(mddev_t *mddev, char *page)
1760 {
1761 return sprintf(page, "%llu\n",
1762 (unsigned long long) mddev->resync_mismatches);
1763 }
1764
1765 static struct md_sysfs_entry md_scan_mode = {
1766 .attr = {.name = "scan_mode", .mode = S_IRUGO|S_IWUSR },
1767 .show = md_show_scan,
1768 .store = md_store_scan,
1769 };
1770
1771 static struct md_sysfs_entry md_mismatches = {
1772 .attr = {.name = "mismatch_cnt", .mode = S_IRUGO },
1773 .show = md_show_mismatch,
1774 };
1775
1776 static struct attribute *md_default_attrs[] = {
1777 &md_level.attr,
1778 &md_raid_disks.attr,
1779 &md_scan_mode.attr,
1780 &md_mismatches.attr,
1781 NULL,
1782 };
1783
1784 static ssize_t
1785 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1786 {
1787 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1788 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
1789
1790 if (!entry->show)
1791 return -EIO;
1792 return entry->show(mddev, page);
1793 }
1794
1795 static ssize_t
1796 md_attr_store(struct kobject *kobj, struct attribute *attr,
1797 const char *page, size_t length)
1798 {
1799 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
1800 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
1801
1802 if (!entry->store)
1803 return -EIO;
1804 return entry->store(mddev, page, length);
1805 }
1806
1807 static void md_free(struct kobject *ko)
1808 {
1809 mddev_t *mddev = container_of(ko, mddev_t, kobj);
1810 kfree(mddev);
1811 }
1812
1813 static struct sysfs_ops md_sysfs_ops = {
1814 .show = md_attr_show,
1815 .store = md_attr_store,
1816 };
1817 static struct kobj_type md_ktype = {
1818 .release = md_free,
1819 .sysfs_ops = &md_sysfs_ops,
1820 .default_attrs = md_default_attrs,
1821 };
1822
1823 int mdp_major = 0;
1824
1825 static struct kobject *md_probe(dev_t dev, int *part, void *data)
1826 {
1827 static DECLARE_MUTEX(disks_sem);
1828 mddev_t *mddev = mddev_find(dev);
1829 struct gendisk *disk;
1830 int partitioned = (MAJOR(dev) != MD_MAJOR);
1831 int shift = partitioned ? MdpMinorShift : 0;
1832 int unit = MINOR(dev) >> shift;
1833
1834 if (!mddev)
1835 return NULL;
1836
1837 down(&disks_sem);
1838 if (mddev->gendisk) {
1839 up(&disks_sem);
1840 mddev_put(mddev);
1841 return NULL;
1842 }
1843 disk = alloc_disk(1 << shift);
1844 if (!disk) {
1845 up(&disks_sem);
1846 mddev_put(mddev);
1847 return NULL;
1848 }
1849 disk->major = MAJOR(dev);
1850 disk->first_minor = unit << shift;
1851 if (partitioned) {
1852 sprintf(disk->disk_name, "md_d%d", unit);
1853 sprintf(disk->devfs_name, "md/d%d", unit);
1854 } else {
1855 sprintf(disk->disk_name, "md%d", unit);
1856 sprintf(disk->devfs_name, "md/%d", unit);
1857 }
1858 disk->fops = &md_fops;
1859 disk->private_data = mddev;
1860 disk->queue = mddev->queue;
1861 add_disk(disk);
1862 mddev->gendisk = disk;
1863 up(&disks_sem);
1864 mddev->kobj.parent = &disk->kobj;
1865 mddev->kobj.k_name = NULL;
1866 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
1867 mddev->kobj.ktype = &md_ktype;
1868 kobject_register(&mddev->kobj);
1869 return NULL;
1870 }
1871
1872 void md_wakeup_thread(mdk_thread_t *thread);
1873
1874 static void md_safemode_timeout(unsigned long data)
1875 {
1876 mddev_t *mddev = (mddev_t *) data;
1877
1878 mddev->safemode = 1;
1879 md_wakeup_thread(mddev->thread);
1880 }
1881
1882
1883 static int do_md_run(mddev_t * mddev)
1884 {
1885 int pnum, err;
1886 int chunk_size;
1887 struct list_head *tmp;
1888 mdk_rdev_t *rdev;
1889 struct gendisk *disk;
1890 char b[BDEVNAME_SIZE];
1891
1892 if (list_empty(&mddev->disks))
1893 /* cannot run an array with no devices.. */
1894 return -EINVAL;
1895
1896 if (mddev->pers)
1897 return -EBUSY;
1898
1899 /*
1900 * Analyze all RAID superblock(s)
1901 */
1902 if (!mddev->raid_disks)
1903 analyze_sbs(mddev);
1904
1905 chunk_size = mddev->chunk_size;
1906 pnum = level_to_pers(mddev->level);
1907
1908 if ((pnum != MULTIPATH) && (pnum != RAID1)) {
1909 if (!chunk_size) {
1910 /*
1911 * 'default chunksize' in the old md code used to
1912 * be PAGE_SIZE, baaad.
1913 * we abort here to be on the safe side. We don't
1914 * want to continue the bad practice.
1915 */
1916 printk(KERN_ERR
1917 "no chunksize specified, see 'man raidtab'\n");
1918 return -EINVAL;
1919 }
1920 if (chunk_size > MAX_CHUNK_SIZE) {
1921 printk(KERN_ERR "too big chunk_size: %d > %d\n",
1922 chunk_size, MAX_CHUNK_SIZE);
1923 return -EINVAL;
1924 }
1925 /*
1926 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
1927 */
1928 if ( (1 << ffz(~chunk_size)) != chunk_size) {
1929 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
1930 return -EINVAL;
1931 }
1932 if (chunk_size < PAGE_SIZE) {
1933 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
1934 chunk_size, PAGE_SIZE);
1935 return -EINVAL;
1936 }
1937
1938 /* devices must have minimum size of one chunk */
1939 ITERATE_RDEV(mddev,rdev,tmp) {
1940 if (test_bit(Faulty, &rdev->flags))
1941 continue;
1942 if (rdev->size < chunk_size / 1024) {
1943 printk(KERN_WARNING
1944 "md: Dev %s smaller than chunk_size:"
1945 " %lluk < %dk\n",
1946 bdevname(rdev->bdev,b),
1947 (unsigned long long)rdev->size,
1948 chunk_size / 1024);
1949 return -EINVAL;
1950 }
1951 }
1952 }
1953
1954 #ifdef CONFIG_KMOD
1955 if (!pers[pnum])
1956 {
1957 request_module("md-personality-%d", pnum);
1958 }
1959 #endif
1960
1961 /*
1962 * Drop all container device buffers, from now on
1963 * the only valid external interface is through the md
1964 * device.
1965 * Also find largest hardsector size
1966 */
1967 ITERATE_RDEV(mddev,rdev,tmp) {
1968 if (test_bit(Faulty, &rdev->flags))
1969 continue;
1970 sync_blockdev(rdev->bdev);
1971 invalidate_bdev(rdev->bdev, 0);
1972 }
1973
1974 md_probe(mddev->unit, NULL, NULL);
1975 disk = mddev->gendisk;
1976 if (!disk)
1977 return -ENOMEM;
1978
1979 spin_lock(&pers_lock);
1980 if (!pers[pnum] || !try_module_get(pers[pnum]->owner)) {
1981 spin_unlock(&pers_lock);
1982 printk(KERN_WARNING "md: personality %d is not loaded!\n",
1983 pnum);
1984 return -EINVAL;
1985 }
1986
1987 mddev->pers = pers[pnum];
1988 spin_unlock(&pers_lock);
1989
1990 mddev->recovery = 0;
1991 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
1992
1993 /* before we start the array running, initialise the bitmap */
1994 err = bitmap_create(mddev);
1995 if (err)
1996 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
1997 mdname(mddev), err);
1998 else
1999 err = mddev->pers->run(mddev);
2000 if (err) {
2001 printk(KERN_ERR "md: pers->run() failed ...\n");
2002 module_put(mddev->pers->owner);
2003 mddev->pers = NULL;
2004 bitmap_destroy(mddev);
2005 return err;
2006 }
2007 atomic_set(&mddev->writes_pending,0);
2008 mddev->safemode = 0;
2009 mddev->safemode_timer.function = md_safemode_timeout;
2010 mddev->safemode_timer.data = (unsigned long) mddev;
2011 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2012 mddev->in_sync = 1;
2013
2014 ITERATE_RDEV(mddev,rdev,tmp)
2015 if (rdev->raid_disk >= 0) {
2016 char nm[20];
2017 sprintf(nm, "rd%d", rdev->raid_disk);
2018 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2019 }
2020
2021 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2022 md_wakeup_thread(mddev->thread);
2023
2024 if (mddev->sb_dirty)
2025 md_update_sb(mddev);
2026
2027 set_capacity(disk, mddev->array_size<<1);
2028
2029 /* If we call blk_queue_make_request here, it will
2030 * re-initialise max_sectors etc which may have been
2031 * refined inside -> run. So just set the bits we need to set.
2032 * Most initialisation happended when we called
2033 * blk_queue_make_request(..., md_fail_request)
2034 * earlier.
2035 */
2036 mddev->queue->queuedata = mddev;
2037 mddev->queue->make_request_fn = mddev->pers->make_request;
2038
2039 mddev->changed = 1;
2040 return 0;
2041 }
2042
2043 static int restart_array(mddev_t *mddev)
2044 {
2045 struct gendisk *disk = mddev->gendisk;
2046 int err;
2047
2048 /*
2049 * Complain if it has no devices
2050 */
2051 err = -ENXIO;
2052 if (list_empty(&mddev->disks))
2053 goto out;
2054
2055 if (mddev->pers) {
2056 err = -EBUSY;
2057 if (!mddev->ro)
2058 goto out;
2059
2060 mddev->safemode = 0;
2061 mddev->ro = 0;
2062 set_disk_ro(disk, 0);
2063
2064 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2065 mdname(mddev));
2066 /*
2067 * Kick recovery or resync if necessary
2068 */
2069 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2070 md_wakeup_thread(mddev->thread);
2071 err = 0;
2072 } else {
2073 printk(KERN_ERR "md: %s has no personality assigned.\n",
2074 mdname(mddev));
2075 err = -EINVAL;
2076 }
2077
2078 out:
2079 return err;
2080 }
2081
2082 static int do_md_stop(mddev_t * mddev, int ro)
2083 {
2084 int err = 0;
2085 struct gendisk *disk = mddev->gendisk;
2086
2087 if (mddev->pers) {
2088 if (atomic_read(&mddev->active)>2) {
2089 printk("md: %s still in use.\n",mdname(mddev));
2090 return -EBUSY;
2091 }
2092
2093 if (mddev->sync_thread) {
2094 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2095 md_unregister_thread(mddev->sync_thread);
2096 mddev->sync_thread = NULL;
2097 }
2098
2099 del_timer_sync(&mddev->safemode_timer);
2100
2101 invalidate_partition(disk, 0);
2102
2103 if (ro) {
2104 err = -ENXIO;
2105 if (mddev->ro)
2106 goto out;
2107 mddev->ro = 1;
2108 } else {
2109 bitmap_flush(mddev);
2110 wait_event(mddev->sb_wait, atomic_read(&mddev->pending_writes)==0);
2111 if (mddev->ro)
2112 set_disk_ro(disk, 0);
2113 blk_queue_make_request(mddev->queue, md_fail_request);
2114 mddev->pers->stop(mddev);
2115 module_put(mddev->pers->owner);
2116 mddev->pers = NULL;
2117 if (mddev->ro)
2118 mddev->ro = 0;
2119 }
2120 if (!mddev->in_sync) {
2121 /* mark array as shutdown cleanly */
2122 mddev->in_sync = 1;
2123 md_update_sb(mddev);
2124 }
2125 if (ro)
2126 set_disk_ro(disk, 1);
2127 }
2128
2129 bitmap_destroy(mddev);
2130 if (mddev->bitmap_file) {
2131 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2132 fput(mddev->bitmap_file);
2133 mddev->bitmap_file = NULL;
2134 }
2135 mddev->bitmap_offset = 0;
2136
2137 /*
2138 * Free resources if final stop
2139 */
2140 if (!ro) {
2141 mdk_rdev_t *rdev;
2142 struct list_head *tmp;
2143 struct gendisk *disk;
2144 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2145
2146 ITERATE_RDEV(mddev,rdev,tmp)
2147 if (rdev->raid_disk >= 0) {
2148 char nm[20];
2149 sprintf(nm, "rd%d", rdev->raid_disk);
2150 sysfs_remove_link(&mddev->kobj, nm);
2151 }
2152
2153 export_array(mddev);
2154
2155 mddev->array_size = 0;
2156 disk = mddev->gendisk;
2157 if (disk)
2158 set_capacity(disk, 0);
2159 mddev->changed = 1;
2160 } else
2161 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2162 mdname(mddev));
2163 err = 0;
2164 out:
2165 return err;
2166 }
2167
2168 static void autorun_array(mddev_t *mddev)
2169 {
2170 mdk_rdev_t *rdev;
2171 struct list_head *tmp;
2172 int err;
2173
2174 if (list_empty(&mddev->disks))
2175 return;
2176
2177 printk(KERN_INFO "md: running: ");
2178
2179 ITERATE_RDEV(mddev,rdev,tmp) {
2180 char b[BDEVNAME_SIZE];
2181 printk("<%s>", bdevname(rdev->bdev,b));
2182 }
2183 printk("\n");
2184
2185 err = do_md_run (mddev);
2186 if (err) {
2187 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2188 do_md_stop (mddev, 0);
2189 }
2190 }
2191
2192 /*
2193 * lets try to run arrays based on all disks that have arrived
2194 * until now. (those are in pending_raid_disks)
2195 *
2196 * the method: pick the first pending disk, collect all disks with
2197 * the same UUID, remove all from the pending list and put them into
2198 * the 'same_array' list. Then order this list based on superblock
2199 * update time (freshest comes first), kick out 'old' disks and
2200 * compare superblocks. If everything's fine then run it.
2201 *
2202 * If "unit" is allocated, then bump its reference count
2203 */
2204 static void autorun_devices(int part)
2205 {
2206 struct list_head candidates;
2207 struct list_head *tmp;
2208 mdk_rdev_t *rdev0, *rdev;
2209 mddev_t *mddev;
2210 char b[BDEVNAME_SIZE];
2211
2212 printk(KERN_INFO "md: autorun ...\n");
2213 while (!list_empty(&pending_raid_disks)) {
2214 dev_t dev;
2215 rdev0 = list_entry(pending_raid_disks.next,
2216 mdk_rdev_t, same_set);
2217
2218 printk(KERN_INFO "md: considering %s ...\n",
2219 bdevname(rdev0->bdev,b));
2220 INIT_LIST_HEAD(&candidates);
2221 ITERATE_RDEV_PENDING(rdev,tmp)
2222 if (super_90_load(rdev, rdev0, 0) >= 0) {
2223 printk(KERN_INFO "md: adding %s ...\n",
2224 bdevname(rdev->bdev,b));
2225 list_move(&rdev->same_set, &candidates);
2226 }
2227 /*
2228 * now we have a set of devices, with all of them having
2229 * mostly sane superblocks. It's time to allocate the
2230 * mddev.
2231 */
2232 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2233 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2234 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2235 break;
2236 }
2237 if (part)
2238 dev = MKDEV(mdp_major,
2239 rdev0->preferred_minor << MdpMinorShift);
2240 else
2241 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2242
2243 md_probe(dev, NULL, NULL);
2244 mddev = mddev_find(dev);
2245 if (!mddev) {
2246 printk(KERN_ERR
2247 "md: cannot allocate memory for md drive.\n");
2248 break;
2249 }
2250 if (mddev_lock(mddev))
2251 printk(KERN_WARNING "md: %s locked, cannot run\n",
2252 mdname(mddev));
2253 else if (mddev->raid_disks || mddev->major_version
2254 || !list_empty(&mddev->disks)) {
2255 printk(KERN_WARNING
2256 "md: %s already running, cannot run %s\n",
2257 mdname(mddev), bdevname(rdev0->bdev,b));
2258 mddev_unlock(mddev);
2259 } else {
2260 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2261 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2262 list_del_init(&rdev->same_set);
2263 if (bind_rdev_to_array(rdev, mddev))
2264 export_rdev(rdev);
2265 }
2266 autorun_array(mddev);
2267 mddev_unlock(mddev);
2268 }
2269 /* on success, candidates will be empty, on error
2270 * it won't...
2271 */
2272 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2273 export_rdev(rdev);
2274 mddev_put(mddev);
2275 }
2276 printk(KERN_INFO "md: ... autorun DONE.\n");
2277 }
2278
2279 /*
2280 * import RAID devices based on one partition
2281 * if possible, the array gets run as well.
2282 */
2283
2284 static int autostart_array(dev_t startdev)
2285 {
2286 char b[BDEVNAME_SIZE];
2287 int err = -EINVAL, i;
2288 mdp_super_t *sb = NULL;
2289 mdk_rdev_t *start_rdev = NULL, *rdev;
2290
2291 start_rdev = md_import_device(startdev, 0, 0);
2292 if (IS_ERR(start_rdev))
2293 return err;
2294
2295
2296 /* NOTE: this can only work for 0.90.0 superblocks */
2297 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2298 if (sb->major_version != 0 ||
2299 sb->minor_version != 90 ) {
2300 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2301 export_rdev(start_rdev);
2302 return err;
2303 }
2304
2305 if (test_bit(Faulty, &start_rdev->flags)) {
2306 printk(KERN_WARNING
2307 "md: can not autostart based on faulty %s!\n",
2308 bdevname(start_rdev->bdev,b));
2309 export_rdev(start_rdev);
2310 return err;
2311 }
2312 list_add(&start_rdev->same_set, &pending_raid_disks);
2313
2314 for (i = 0; i < MD_SB_DISKS; i++) {
2315 mdp_disk_t *desc = sb->disks + i;
2316 dev_t dev = MKDEV(desc->major, desc->minor);
2317
2318 if (!dev)
2319 continue;
2320 if (dev == startdev)
2321 continue;
2322 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2323 continue;
2324 rdev = md_import_device(dev, 0, 0);
2325 if (IS_ERR(rdev))
2326 continue;
2327
2328 list_add(&rdev->same_set, &pending_raid_disks);
2329 }
2330
2331 /*
2332 * possibly return codes
2333 */
2334 autorun_devices(0);
2335 return 0;
2336
2337 }
2338
2339
2340 static int get_version(void __user * arg)
2341 {
2342 mdu_version_t ver;
2343
2344 ver.major = MD_MAJOR_VERSION;
2345 ver.minor = MD_MINOR_VERSION;
2346 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2347
2348 if (copy_to_user(arg, &ver, sizeof(ver)))
2349 return -EFAULT;
2350
2351 return 0;
2352 }
2353
2354 static int get_array_info(mddev_t * mddev, void __user * arg)
2355 {
2356 mdu_array_info_t info;
2357 int nr,working,active,failed,spare;
2358 mdk_rdev_t *rdev;
2359 struct list_head *tmp;
2360
2361 nr=working=active=failed=spare=0;
2362 ITERATE_RDEV(mddev,rdev,tmp) {
2363 nr++;
2364 if (test_bit(Faulty, &rdev->flags))
2365 failed++;
2366 else {
2367 working++;
2368 if (test_bit(In_sync, &rdev->flags))
2369 active++;
2370 else
2371 spare++;
2372 }
2373 }
2374
2375 info.major_version = mddev->major_version;
2376 info.minor_version = mddev->minor_version;
2377 info.patch_version = MD_PATCHLEVEL_VERSION;
2378 info.ctime = mddev->ctime;
2379 info.level = mddev->level;
2380 info.size = mddev->size;
2381 info.nr_disks = nr;
2382 info.raid_disks = mddev->raid_disks;
2383 info.md_minor = mddev->md_minor;
2384 info.not_persistent= !mddev->persistent;
2385
2386 info.utime = mddev->utime;
2387 info.state = 0;
2388 if (mddev->in_sync)
2389 info.state = (1<<MD_SB_CLEAN);
2390 if (mddev->bitmap && mddev->bitmap_offset)
2391 info.state = (1<<MD_SB_BITMAP_PRESENT);
2392 info.active_disks = active;
2393 info.working_disks = working;
2394 info.failed_disks = failed;
2395 info.spare_disks = spare;
2396
2397 info.layout = mddev->layout;
2398 info.chunk_size = mddev->chunk_size;
2399
2400 if (copy_to_user(arg, &info, sizeof(info)))
2401 return -EFAULT;
2402
2403 return 0;
2404 }
2405
2406 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
2407 {
2408 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2409 char *ptr, *buf = NULL;
2410 int err = -ENOMEM;
2411
2412 file = kmalloc(sizeof(*file), GFP_KERNEL);
2413 if (!file)
2414 goto out;
2415
2416 /* bitmap disabled, zero the first byte and copy out */
2417 if (!mddev->bitmap || !mddev->bitmap->file) {
2418 file->pathname[0] = '\0';
2419 goto copy_out;
2420 }
2421
2422 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2423 if (!buf)
2424 goto out;
2425
2426 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2427 if (!ptr)
2428 goto out;
2429
2430 strcpy(file->pathname, ptr);
2431
2432 copy_out:
2433 err = 0;
2434 if (copy_to_user(arg, file, sizeof(*file)))
2435 err = -EFAULT;
2436 out:
2437 kfree(buf);
2438 kfree(file);
2439 return err;
2440 }
2441
2442 static int get_disk_info(mddev_t * mddev, void __user * arg)
2443 {
2444 mdu_disk_info_t info;
2445 unsigned int nr;
2446 mdk_rdev_t *rdev;
2447
2448 if (copy_from_user(&info, arg, sizeof(info)))
2449 return -EFAULT;
2450
2451 nr = info.number;
2452
2453 rdev = find_rdev_nr(mddev, nr);
2454 if (rdev) {
2455 info.major = MAJOR(rdev->bdev->bd_dev);
2456 info.minor = MINOR(rdev->bdev->bd_dev);
2457 info.raid_disk = rdev->raid_disk;
2458 info.state = 0;
2459 if (test_bit(Faulty, &rdev->flags))
2460 info.state |= (1<<MD_DISK_FAULTY);
2461 else if (test_bit(In_sync, &rdev->flags)) {
2462 info.state |= (1<<MD_DISK_ACTIVE);
2463 info.state |= (1<<MD_DISK_SYNC);
2464 }
2465 if (test_bit(WriteMostly, &rdev->flags))
2466 info.state |= (1<<MD_DISK_WRITEMOSTLY);
2467 } else {
2468 info.major = info.minor = 0;
2469 info.raid_disk = -1;
2470 info.state = (1<<MD_DISK_REMOVED);
2471 }
2472
2473 if (copy_to_user(arg, &info, sizeof(info)))
2474 return -EFAULT;
2475
2476 return 0;
2477 }
2478
2479 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
2480 {
2481 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
2482 mdk_rdev_t *rdev;
2483 dev_t dev = MKDEV(info->major,info->minor);
2484
2485 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
2486 return -EOVERFLOW;
2487
2488 if (!mddev->raid_disks) {
2489 int err;
2490 /* expecting a device which has a superblock */
2491 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
2492 if (IS_ERR(rdev)) {
2493 printk(KERN_WARNING
2494 "md: md_import_device returned %ld\n",
2495 PTR_ERR(rdev));
2496 return PTR_ERR(rdev);
2497 }
2498 if (!list_empty(&mddev->disks)) {
2499 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2500 mdk_rdev_t, same_set);
2501 int err = super_types[mddev->major_version]
2502 .load_super(rdev, rdev0, mddev->minor_version);
2503 if (err < 0) {
2504 printk(KERN_WARNING
2505 "md: %s has different UUID to %s\n",
2506 bdevname(rdev->bdev,b),
2507 bdevname(rdev0->bdev,b2));
2508 export_rdev(rdev);
2509 return -EINVAL;
2510 }
2511 }
2512 err = bind_rdev_to_array(rdev, mddev);
2513 if (err)
2514 export_rdev(rdev);
2515 return err;
2516 }
2517
2518 /*
2519 * add_new_disk can be used once the array is assembled
2520 * to add "hot spares". They must already have a superblock
2521 * written
2522 */
2523 if (mddev->pers) {
2524 int err;
2525 if (!mddev->pers->hot_add_disk) {
2526 printk(KERN_WARNING
2527 "%s: personality does not support diskops!\n",
2528 mdname(mddev));
2529 return -EINVAL;
2530 }
2531 if (mddev->persistent)
2532 rdev = md_import_device(dev, mddev->major_version,
2533 mddev->minor_version);
2534 else
2535 rdev = md_import_device(dev, -1, -1);
2536 if (IS_ERR(rdev)) {
2537 printk(KERN_WARNING
2538 "md: md_import_device returned %ld\n",
2539 PTR_ERR(rdev));
2540 return PTR_ERR(rdev);
2541 }
2542 /* set save_raid_disk if appropriate */
2543 if (!mddev->persistent) {
2544 if (info->state & (1<<MD_DISK_SYNC) &&
2545 info->raid_disk < mddev->raid_disks)
2546 rdev->raid_disk = info->raid_disk;
2547 else
2548 rdev->raid_disk = -1;
2549 } else
2550 super_types[mddev->major_version].
2551 validate_super(mddev, rdev);
2552 rdev->saved_raid_disk = rdev->raid_disk;
2553
2554 clear_bit(In_sync, &rdev->flags); /* just to be sure */
2555 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2556 set_bit(WriteMostly, &rdev->flags);
2557
2558 rdev->raid_disk = -1;
2559 err = bind_rdev_to_array(rdev, mddev);
2560 if (err)
2561 export_rdev(rdev);
2562
2563 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2564 md_wakeup_thread(mddev->thread);
2565 return err;
2566 }
2567
2568 /* otherwise, add_new_disk is only allowed
2569 * for major_version==0 superblocks
2570 */
2571 if (mddev->major_version != 0) {
2572 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
2573 mdname(mddev));
2574 return -EINVAL;
2575 }
2576
2577 if (!(info->state & (1<<MD_DISK_FAULTY))) {
2578 int err;
2579 rdev = md_import_device (dev, -1, 0);
2580 if (IS_ERR(rdev)) {
2581 printk(KERN_WARNING
2582 "md: error, md_import_device() returned %ld\n",
2583 PTR_ERR(rdev));
2584 return PTR_ERR(rdev);
2585 }
2586 rdev->desc_nr = info->number;
2587 if (info->raid_disk < mddev->raid_disks)
2588 rdev->raid_disk = info->raid_disk;
2589 else
2590 rdev->raid_disk = -1;
2591
2592 rdev->flags = 0;
2593
2594 if (rdev->raid_disk < mddev->raid_disks)
2595 if (info->state & (1<<MD_DISK_SYNC))
2596 set_bit(In_sync, &rdev->flags);
2597
2598 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2599 set_bit(WriteMostly, &rdev->flags);
2600
2601 err = bind_rdev_to_array(rdev, mddev);
2602 if (err) {
2603 export_rdev(rdev);
2604 return err;
2605 }
2606
2607 if (!mddev->persistent) {
2608 printk(KERN_INFO "md: nonpersistent superblock ...\n");
2609 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2610 } else
2611 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2612 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
2613
2614 if (!mddev->size || (mddev->size > rdev->size))
2615 mddev->size = rdev->size;
2616 }
2617
2618 return 0;
2619 }
2620
2621 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
2622 {
2623 char b[BDEVNAME_SIZE];
2624 mdk_rdev_t *rdev;
2625
2626 if (!mddev->pers)
2627 return -ENODEV;
2628
2629 rdev = find_rdev(mddev, dev);
2630 if (!rdev)
2631 return -ENXIO;
2632
2633 if (rdev->raid_disk >= 0)
2634 goto busy;
2635
2636 kick_rdev_from_array(rdev);
2637 md_update_sb(mddev);
2638
2639 return 0;
2640 busy:
2641 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
2642 bdevname(rdev->bdev,b), mdname(mddev));
2643 return -EBUSY;
2644 }
2645
2646 static int hot_add_disk(mddev_t * mddev, dev_t dev)
2647 {
2648 char b[BDEVNAME_SIZE];
2649 int err;
2650 unsigned int size;
2651 mdk_rdev_t *rdev;
2652
2653 if (!mddev->pers)
2654 return -ENODEV;
2655
2656 if (mddev->major_version != 0) {
2657 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
2658 " version-0 superblocks.\n",
2659 mdname(mddev));
2660 return -EINVAL;
2661 }
2662 if (!mddev->pers->hot_add_disk) {
2663 printk(KERN_WARNING
2664 "%s: personality does not support diskops!\n",
2665 mdname(mddev));
2666 return -EINVAL;
2667 }
2668
2669 rdev = md_import_device (dev, -1, 0);
2670 if (IS_ERR(rdev)) {
2671 printk(KERN_WARNING
2672 "md: error, md_import_device() returned %ld\n",
2673 PTR_ERR(rdev));
2674 return -EINVAL;
2675 }
2676
2677 if (mddev->persistent)
2678 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2679 else
2680 rdev->sb_offset =
2681 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2682
2683 size = calc_dev_size(rdev, mddev->chunk_size);
2684 rdev->size = size;
2685
2686 if (size < mddev->size) {
2687 printk(KERN_WARNING
2688 "%s: disk size %llu blocks < array size %llu\n",
2689 mdname(mddev), (unsigned long long)size,
2690 (unsigned long long)mddev->size);
2691 err = -ENOSPC;
2692 goto abort_export;
2693 }
2694
2695 if (test_bit(Faulty, &rdev->flags)) {
2696 printk(KERN_WARNING
2697 "md: can not hot-add faulty %s disk to %s!\n",
2698 bdevname(rdev->bdev,b), mdname(mddev));
2699 err = -EINVAL;
2700 goto abort_export;
2701 }
2702 clear_bit(In_sync, &rdev->flags);
2703 rdev->desc_nr = -1;
2704 bind_rdev_to_array(rdev, mddev);
2705
2706 /*
2707 * The rest should better be atomic, we can have disk failures
2708 * noticed in interrupt contexts ...
2709 */
2710
2711 if (rdev->desc_nr == mddev->max_disks) {
2712 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
2713 mdname(mddev));
2714 err = -EBUSY;
2715 goto abort_unbind_export;
2716 }
2717
2718 rdev->raid_disk = -1;
2719
2720 md_update_sb(mddev);
2721
2722 /*
2723 * Kick recovery, maybe this spare has to be added to the
2724 * array immediately.
2725 */
2726 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2727 md_wakeup_thread(mddev->thread);
2728
2729 return 0;
2730
2731 abort_unbind_export:
2732 unbind_rdev_from_array(rdev);
2733
2734 abort_export:
2735 export_rdev(rdev);
2736 return err;
2737 }
2738
2739 /* similar to deny_write_access, but accounts for our holding a reference
2740 * to the file ourselves */
2741 static int deny_bitmap_write_access(struct file * file)
2742 {
2743 struct inode *inode = file->f_mapping->host;
2744
2745 spin_lock(&inode->i_lock);
2746 if (atomic_read(&inode->i_writecount) > 1) {
2747 spin_unlock(&inode->i_lock);
2748 return -ETXTBSY;
2749 }
2750 atomic_set(&inode->i_writecount, -1);
2751 spin_unlock(&inode->i_lock);
2752
2753 return 0;
2754 }
2755
2756 static int set_bitmap_file(mddev_t *mddev, int fd)
2757 {
2758 int err;
2759
2760 if (mddev->pers) {
2761 if (!mddev->pers->quiesce)
2762 return -EBUSY;
2763 if (mddev->recovery || mddev->sync_thread)
2764 return -EBUSY;
2765 /* we should be able to change the bitmap.. */
2766 }
2767
2768
2769 if (fd >= 0) {
2770 if (mddev->bitmap)
2771 return -EEXIST; /* cannot add when bitmap is present */
2772 mddev->bitmap_file = fget(fd);
2773
2774 if (mddev->bitmap_file == NULL) {
2775 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
2776 mdname(mddev));
2777 return -EBADF;
2778 }
2779
2780 err = deny_bitmap_write_access(mddev->bitmap_file);
2781 if (err) {
2782 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
2783 mdname(mddev));
2784 fput(mddev->bitmap_file);
2785 mddev->bitmap_file = NULL;
2786 return err;
2787 }
2788 mddev->bitmap_offset = 0; /* file overrides offset */
2789 } else if (mddev->bitmap == NULL)
2790 return -ENOENT; /* cannot remove what isn't there */
2791 err = 0;
2792 if (mddev->pers) {
2793 mddev->pers->quiesce(mddev, 1);
2794 if (fd >= 0)
2795 err = bitmap_create(mddev);
2796 if (fd < 0 || err)
2797 bitmap_destroy(mddev);
2798 mddev->pers->quiesce(mddev, 0);
2799 } else if (fd < 0) {
2800 if (mddev->bitmap_file)
2801 fput(mddev->bitmap_file);
2802 mddev->bitmap_file = NULL;
2803 }
2804
2805 return err;
2806 }
2807
2808 /*
2809 * set_array_info is used two different ways
2810 * The original usage is when creating a new array.
2811 * In this usage, raid_disks is > 0 and it together with
2812 * level, size, not_persistent,layout,chunksize determine the
2813 * shape of the array.
2814 * This will always create an array with a type-0.90.0 superblock.
2815 * The newer usage is when assembling an array.
2816 * In this case raid_disks will be 0, and the major_version field is
2817 * use to determine which style super-blocks are to be found on the devices.
2818 * The minor and patch _version numbers are also kept incase the
2819 * super_block handler wishes to interpret them.
2820 */
2821 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
2822 {
2823
2824 if (info->raid_disks == 0) {
2825 /* just setting version number for superblock loading */
2826 if (info->major_version < 0 ||
2827 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
2828 super_types[info->major_version].name == NULL) {
2829 /* maybe try to auto-load a module? */
2830 printk(KERN_INFO
2831 "md: superblock version %d not known\n",
2832 info->major_version);
2833 return -EINVAL;
2834 }
2835 mddev->major_version = info->major_version;
2836 mddev->minor_version = info->minor_version;
2837 mddev->patch_version = info->patch_version;
2838 return 0;
2839 }
2840 mddev->major_version = MD_MAJOR_VERSION;
2841 mddev->minor_version = MD_MINOR_VERSION;
2842 mddev->patch_version = MD_PATCHLEVEL_VERSION;
2843 mddev->ctime = get_seconds();
2844
2845 mddev->level = info->level;
2846 mddev->size = info->size;
2847 mddev->raid_disks = info->raid_disks;
2848 /* don't set md_minor, it is determined by which /dev/md* was
2849 * openned
2850 */
2851 if (info->state & (1<<MD_SB_CLEAN))
2852 mddev->recovery_cp = MaxSector;
2853 else
2854 mddev->recovery_cp = 0;
2855 mddev->persistent = ! info->not_persistent;
2856
2857 mddev->layout = info->layout;
2858 mddev->chunk_size = info->chunk_size;
2859
2860 mddev->max_disks = MD_SB_DISKS;
2861
2862 mddev->sb_dirty = 1;
2863
2864 /*
2865 * Generate a 128 bit UUID
2866 */
2867 get_random_bytes(mddev->uuid, 16);
2868
2869 return 0;
2870 }
2871
2872 /*
2873 * update_array_info is used to change the configuration of an
2874 * on-line array.
2875 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
2876 * fields in the info are checked against the array.
2877 * Any differences that cannot be handled will cause an error.
2878 * Normally, only one change can be managed at a time.
2879 */
2880 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
2881 {
2882 int rv = 0;
2883 int cnt = 0;
2884 int state = 0;
2885
2886 /* calculate expected state,ignoring low bits */
2887 if (mddev->bitmap && mddev->bitmap_offset)
2888 state |= (1 << MD_SB_BITMAP_PRESENT);
2889
2890 if (mddev->major_version != info->major_version ||
2891 mddev->minor_version != info->minor_version ||
2892 /* mddev->patch_version != info->patch_version || */
2893 mddev->ctime != info->ctime ||
2894 mddev->level != info->level ||
2895 /* mddev->layout != info->layout || */
2896 !mddev->persistent != info->not_persistent||
2897 mddev->chunk_size != info->chunk_size ||
2898 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
2899 ((state^info->state) & 0xfffffe00)
2900 )
2901 return -EINVAL;
2902 /* Check there is only one change */
2903 if (mddev->size != info->size) cnt++;
2904 if (mddev->raid_disks != info->raid_disks) cnt++;
2905 if (mddev->layout != info->layout) cnt++;
2906 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
2907 if (cnt == 0) return 0;
2908 if (cnt > 1) return -EINVAL;
2909
2910 if (mddev->layout != info->layout) {
2911 /* Change layout
2912 * we don't need to do anything at the md level, the
2913 * personality will take care of it all.
2914 */
2915 if (mddev->pers->reconfig == NULL)
2916 return -EINVAL;
2917 else
2918 return mddev->pers->reconfig(mddev, info->layout, -1);
2919 }
2920 if (mddev->size != info->size) {
2921 mdk_rdev_t * rdev;
2922 struct list_head *tmp;
2923 if (mddev->pers->resize == NULL)
2924 return -EINVAL;
2925 /* The "size" is the amount of each device that is used.
2926 * This can only make sense for arrays with redundancy.
2927 * linear and raid0 always use whatever space is available
2928 * We can only consider changing the size if no resync
2929 * or reconstruction is happening, and if the new size
2930 * is acceptable. It must fit before the sb_offset or,
2931 * if that is <data_offset, it must fit before the
2932 * size of each device.
2933 * If size is zero, we find the largest size that fits.
2934 */
2935 if (mddev->sync_thread)
2936 return -EBUSY;
2937 ITERATE_RDEV(mddev,rdev,tmp) {
2938 sector_t avail;
2939 int fit = (info->size == 0);
2940 if (rdev->sb_offset > rdev->data_offset)
2941 avail = (rdev->sb_offset*2) - rdev->data_offset;
2942 else
2943 avail = get_capacity(rdev->bdev->bd_disk)
2944 - rdev->data_offset;
2945 if (fit && (info->size == 0 || info->size > avail/2))
2946 info->size = avail/2;
2947 if (avail < ((sector_t)info->size << 1))
2948 return -ENOSPC;
2949 }
2950 rv = mddev->pers->resize(mddev, (sector_t)info->size *2);
2951 if (!rv) {
2952 struct block_device *bdev;
2953
2954 bdev = bdget_disk(mddev->gendisk, 0);
2955 if (bdev) {
2956 down(&bdev->bd_inode->i_sem);
2957 i_size_write(bdev->bd_inode, mddev->array_size << 10);
2958 up(&bdev->bd_inode->i_sem);
2959 bdput(bdev);
2960 }
2961 }
2962 }
2963 if (mddev->raid_disks != info->raid_disks) {
2964 /* change the number of raid disks */
2965 if (mddev->pers->reshape == NULL)
2966 return -EINVAL;
2967 if (info->raid_disks <= 0 ||
2968 info->raid_disks >= mddev->max_disks)
2969 return -EINVAL;
2970 if (mddev->sync_thread)
2971 return -EBUSY;
2972 rv = mddev->pers->reshape(mddev, info->raid_disks);
2973 if (!rv) {
2974 struct block_device *bdev;
2975
2976 bdev = bdget_disk(mddev->gendisk, 0);
2977 if (bdev) {
2978 down(&bdev->bd_inode->i_sem);
2979 i_size_write(bdev->bd_inode, mddev->array_size << 10);
2980 up(&bdev->bd_inode->i_sem);
2981 bdput(bdev);
2982 }
2983 }
2984 }
2985 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
2986 if (mddev->pers->quiesce == NULL)
2987 return -EINVAL;
2988 if (mddev->recovery || mddev->sync_thread)
2989 return -EBUSY;
2990 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
2991 /* add the bitmap */
2992 if (mddev->bitmap)
2993 return -EEXIST;
2994 if (mddev->default_bitmap_offset == 0)
2995 return -EINVAL;
2996 mddev->bitmap_offset = mddev->default_bitmap_offset;
2997 mddev->pers->quiesce(mddev, 1);
2998 rv = bitmap_create(mddev);
2999 if (rv)
3000 bitmap_destroy(mddev);
3001 mddev->pers->quiesce(mddev, 0);
3002 } else {
3003 /* remove the bitmap */
3004 if (!mddev->bitmap)
3005 return -ENOENT;
3006 if (mddev->bitmap->file)
3007 return -EINVAL;
3008 mddev->pers->quiesce(mddev, 1);
3009 bitmap_destroy(mddev);
3010 mddev->pers->quiesce(mddev, 0);
3011 mddev->bitmap_offset = 0;
3012 }
3013 }
3014 md_update_sb(mddev);
3015 return rv;
3016 }
3017
3018 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3019 {
3020 mdk_rdev_t *rdev;
3021
3022 if (mddev->pers == NULL)
3023 return -ENODEV;
3024
3025 rdev = find_rdev(mddev, dev);
3026 if (!rdev)
3027 return -ENODEV;
3028
3029 md_error(mddev, rdev);
3030 return 0;
3031 }
3032
3033 static int md_ioctl(struct inode *inode, struct file *file,
3034 unsigned int cmd, unsigned long arg)
3035 {
3036 int err = 0;
3037 void __user *argp = (void __user *)arg;
3038 struct hd_geometry __user *loc = argp;
3039 mddev_t *mddev = NULL;
3040
3041 if (!capable(CAP_SYS_ADMIN))
3042 return -EACCES;
3043
3044 /*
3045 * Commands dealing with the RAID driver but not any
3046 * particular array:
3047 */
3048 switch (cmd)
3049 {
3050 case RAID_VERSION:
3051 err = get_version(argp);
3052 goto done;
3053
3054 case PRINT_RAID_DEBUG:
3055 err = 0;
3056 md_print_devices();
3057 goto done;
3058
3059 #ifndef MODULE
3060 case RAID_AUTORUN:
3061 err = 0;
3062 autostart_arrays(arg);
3063 goto done;
3064 #endif
3065 default:;
3066 }
3067
3068 /*
3069 * Commands creating/starting a new array:
3070 */
3071
3072 mddev = inode->i_bdev->bd_disk->private_data;
3073
3074 if (!mddev) {
3075 BUG();
3076 goto abort;
3077 }
3078
3079
3080 if (cmd == START_ARRAY) {
3081 /* START_ARRAY doesn't need to lock the array as autostart_array
3082 * does the locking, and it could even be a different array
3083 */
3084 static int cnt = 3;
3085 if (cnt > 0 ) {
3086 printk(KERN_WARNING
3087 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3088 "This will not be supported beyond 2.6\n",
3089 current->comm, current->pid);
3090 cnt--;
3091 }
3092 err = autostart_array(new_decode_dev(arg));
3093 if (err) {
3094 printk(KERN_WARNING "md: autostart failed!\n");
3095 goto abort;
3096 }
3097 goto done;
3098 }
3099
3100 err = mddev_lock(mddev);
3101 if (err) {
3102 printk(KERN_INFO
3103 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3104 err, cmd);
3105 goto abort;
3106 }
3107
3108 switch (cmd)
3109 {
3110 case SET_ARRAY_INFO:
3111 {
3112 mdu_array_info_t info;
3113 if (!arg)
3114 memset(&info, 0, sizeof(info));
3115 else if (copy_from_user(&info, argp, sizeof(info))) {
3116 err = -EFAULT;
3117 goto abort_unlock;
3118 }
3119 if (mddev->pers) {
3120 err = update_array_info(mddev, &info);
3121 if (err) {
3122 printk(KERN_WARNING "md: couldn't update"
3123 " array info. %d\n", err);
3124 goto abort_unlock;
3125 }
3126 goto done_unlock;
3127 }
3128 if (!list_empty(&mddev->disks)) {
3129 printk(KERN_WARNING
3130 "md: array %s already has disks!\n",
3131 mdname(mddev));
3132 err = -EBUSY;
3133 goto abort_unlock;
3134 }
3135 if (mddev->raid_disks) {
3136 printk(KERN_WARNING
3137 "md: array %s already initialised!\n",
3138 mdname(mddev));
3139 err = -EBUSY;
3140 goto abort_unlock;
3141 }
3142 err = set_array_info(mddev, &info);
3143 if (err) {
3144 printk(KERN_WARNING "md: couldn't set"
3145 " array info. %d\n", err);
3146 goto abort_unlock;
3147 }
3148 }
3149 goto done_unlock;
3150
3151 default:;
3152 }
3153
3154 /*
3155 * Commands querying/configuring an existing array:
3156 */
3157 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3158 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3159 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3160 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
3161 err = -ENODEV;
3162 goto abort_unlock;
3163 }
3164
3165 /*
3166 * Commands even a read-only array can execute:
3167 */
3168 switch (cmd)
3169 {
3170 case GET_ARRAY_INFO:
3171 err = get_array_info(mddev, argp);
3172 goto done_unlock;
3173
3174 case GET_BITMAP_FILE:
3175 err = get_bitmap_file(mddev, argp);
3176 goto done_unlock;
3177
3178 case GET_DISK_INFO:
3179 err = get_disk_info(mddev, argp);
3180 goto done_unlock;
3181
3182 case RESTART_ARRAY_RW:
3183 err = restart_array(mddev);
3184 goto done_unlock;
3185
3186 case STOP_ARRAY:
3187 err = do_md_stop (mddev, 0);
3188 goto done_unlock;
3189
3190 case STOP_ARRAY_RO:
3191 err = do_md_stop (mddev, 1);
3192 goto done_unlock;
3193
3194 /*
3195 * We have a problem here : there is no easy way to give a CHS
3196 * virtual geometry. We currently pretend that we have a 2 heads
3197 * 4 sectors (with a BIG number of cylinders...). This drives
3198 * dosfs just mad... ;-)
3199 */
3200 case HDIO_GETGEO:
3201 if (!loc) {
3202 err = -EINVAL;
3203 goto abort_unlock;
3204 }
3205 err = put_user (2, (char __user *) &loc->heads);
3206 if (err)
3207 goto abort_unlock;
3208 err = put_user (4, (char __user *) &loc->sectors);
3209 if (err)
3210 goto abort_unlock;
3211 err = put_user(get_capacity(mddev->gendisk)/8,
3212 (short __user *) &loc->cylinders);
3213 if (err)
3214 goto abort_unlock;
3215 err = put_user (get_start_sect(inode->i_bdev),
3216 (long __user *) &loc->start);
3217 goto done_unlock;
3218 }
3219
3220 /*
3221 * The remaining ioctls are changing the state of the
3222 * superblock, so we do not allow read-only arrays
3223 * here:
3224 */
3225 if (mddev->ro) {
3226 err = -EROFS;
3227 goto abort_unlock;
3228 }
3229
3230 switch (cmd)
3231 {
3232 case ADD_NEW_DISK:
3233 {
3234 mdu_disk_info_t info;
3235 if (copy_from_user(&info, argp, sizeof(info)))
3236 err = -EFAULT;
3237 else
3238 err = add_new_disk(mddev, &info);
3239 goto done_unlock;
3240 }
3241
3242 case HOT_REMOVE_DISK:
3243 err = hot_remove_disk(mddev, new_decode_dev(arg));
3244 goto done_unlock;
3245
3246 case HOT_ADD_DISK:
3247 err = hot_add_disk(mddev, new_decode_dev(arg));
3248 goto done_unlock;
3249
3250 case SET_DISK_FAULTY:
3251 err = set_disk_faulty(mddev, new_decode_dev(arg));
3252 goto done_unlock;
3253
3254 case RUN_ARRAY:
3255 err = do_md_run (mddev);
3256 goto done_unlock;
3257
3258 case SET_BITMAP_FILE:
3259 err = set_bitmap_file(mddev, (int)arg);
3260 goto done_unlock;
3261
3262 default:
3263 if (_IOC_TYPE(cmd) == MD_MAJOR)
3264 printk(KERN_WARNING "md: %s(pid %d) used"
3265 " obsolete MD ioctl, upgrade your"
3266 " software to use new ictls.\n",
3267 current->comm, current->pid);
3268 err = -EINVAL;
3269 goto abort_unlock;
3270 }
3271
3272 done_unlock:
3273 abort_unlock:
3274 mddev_unlock(mddev);
3275
3276 return err;
3277 done:
3278 if (err)
3279 MD_BUG();
3280 abort:
3281 return err;
3282 }
3283
3284 static int md_open(struct inode *inode, struct file *file)
3285 {
3286 /*
3287 * Succeed if we can lock the mddev, which confirms that
3288 * it isn't being stopped right now.
3289 */
3290 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3291 int err;
3292
3293 if ((err = mddev_lock(mddev)))
3294 goto out;
3295
3296 err = 0;
3297 mddev_get(mddev);
3298 mddev_unlock(mddev);
3299
3300 check_disk_change(inode->i_bdev);
3301 out:
3302 return err;
3303 }
3304
3305 static int md_release(struct inode *inode, struct file * file)
3306 {
3307 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3308
3309 if (!mddev)
3310 BUG();
3311 mddev_put(mddev);
3312
3313 return 0;
3314 }
3315
3316 static int md_media_changed(struct gendisk *disk)
3317 {
3318 mddev_t *mddev = disk->private_data;
3319
3320 return mddev->changed;
3321 }
3322
3323 static int md_revalidate(struct gendisk *disk)
3324 {
3325 mddev_t *mddev = disk->private_data;
3326
3327 mddev->changed = 0;
3328 return 0;
3329 }
3330 static struct block_device_operations md_fops =
3331 {
3332 .owner = THIS_MODULE,
3333 .open = md_open,
3334 .release = md_release,
3335 .ioctl = md_ioctl,
3336 .media_changed = md_media_changed,
3337 .revalidate_disk= md_revalidate,
3338 };
3339
3340 static int md_thread(void * arg)
3341 {
3342 mdk_thread_t *thread = arg;
3343
3344 /*
3345 * md_thread is a 'system-thread', it's priority should be very
3346 * high. We avoid resource deadlocks individually in each
3347 * raid personality. (RAID5 does preallocation) We also use RR and
3348 * the very same RT priority as kswapd, thus we will never get
3349 * into a priority inversion deadlock.
3350 *
3351 * we definitely have to have equal or higher priority than
3352 * bdflush, otherwise bdflush will deadlock if there are too
3353 * many dirty RAID5 blocks.
3354 */
3355
3356 allow_signal(SIGKILL);
3357 complete(thread->event);
3358 while (!kthread_should_stop()) {
3359 void (*run)(mddev_t *);
3360
3361 wait_event_interruptible_timeout(thread->wqueue,
3362 test_bit(THREAD_WAKEUP, &thread->flags)
3363 || kthread_should_stop(),
3364 thread->timeout);
3365 try_to_freeze();
3366
3367 clear_bit(THREAD_WAKEUP, &thread->flags);
3368
3369 run = thread->run;
3370 if (run)
3371 run(thread->mddev);
3372 }
3373
3374 return 0;
3375 }
3376
3377 void md_wakeup_thread(mdk_thread_t *thread)
3378 {
3379 if (thread) {
3380 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3381 set_bit(THREAD_WAKEUP, &thread->flags);
3382 wake_up(&thread->wqueue);
3383 }
3384 }
3385
3386 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3387 const char *name)
3388 {
3389 mdk_thread_t *thread;
3390 struct completion event;
3391
3392 thread = kmalloc(sizeof(mdk_thread_t), GFP_KERNEL);
3393 if (!thread)
3394 return NULL;
3395
3396 memset(thread, 0, sizeof(mdk_thread_t));
3397 init_waitqueue_head(&thread->wqueue);
3398
3399 init_completion(&event);
3400 thread->event = &event;
3401 thread->run = run;
3402 thread->mddev = mddev;
3403 thread->name = name;
3404 thread->timeout = MAX_SCHEDULE_TIMEOUT;
3405 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
3406 if (IS_ERR(thread->tsk)) {
3407 kfree(thread);
3408 return NULL;
3409 }
3410 wait_for_completion(&event);
3411 return thread;
3412 }
3413
3414 void md_unregister_thread(mdk_thread_t *thread)
3415 {
3416 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
3417
3418 kthread_stop(thread->tsk);
3419 kfree(thread);
3420 }
3421
3422 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3423 {
3424 if (!mddev) {
3425 MD_BUG();
3426 return;
3427 }
3428
3429 if (!rdev || test_bit(Faulty, &rdev->flags))
3430 return;
3431 /*
3432 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3433 mdname(mddev),
3434 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3435 __builtin_return_address(0),__builtin_return_address(1),
3436 __builtin_return_address(2),__builtin_return_address(3));
3437 */
3438 if (!mddev->pers->error_handler)
3439 return;
3440 mddev->pers->error_handler(mddev,rdev);
3441 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3442 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3443 md_wakeup_thread(mddev->thread);
3444 }
3445
3446 /* seq_file implementation /proc/mdstat */
3447
3448 static void status_unused(struct seq_file *seq)
3449 {
3450 int i = 0;
3451 mdk_rdev_t *rdev;
3452 struct list_head *tmp;
3453
3454 seq_printf(seq, "unused devices: ");
3455
3456 ITERATE_RDEV_PENDING(rdev,tmp) {
3457 char b[BDEVNAME_SIZE];
3458 i++;
3459 seq_printf(seq, "%s ",
3460 bdevname(rdev->bdev,b));
3461 }
3462 if (!i)
3463 seq_printf(seq, "<none>");
3464
3465 seq_printf(seq, "\n");
3466 }
3467
3468
3469 static void status_resync(struct seq_file *seq, mddev_t * mddev)
3470 {
3471 unsigned long max_blocks, resync, res, dt, db, rt;
3472
3473 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
3474
3475 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3476 max_blocks = mddev->resync_max_sectors >> 1;
3477 else
3478 max_blocks = mddev->size;
3479
3480 /*
3481 * Should not happen.
3482 */
3483 if (!max_blocks) {
3484 MD_BUG();
3485 return;
3486 }
3487 res = (resync/1024)*1000/(max_blocks/1024 + 1);
3488 {
3489 int i, x = res/50, y = 20-x;
3490 seq_printf(seq, "[");
3491 for (i = 0; i < x; i++)
3492 seq_printf(seq, "=");
3493 seq_printf(seq, ">");
3494 for (i = 0; i < y; i++)
3495 seq_printf(seq, ".");
3496 seq_printf(seq, "] ");
3497 }
3498 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
3499 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
3500 "resync" : "recovery"),
3501 res/10, res % 10, resync, max_blocks);
3502
3503 /*
3504 * We do not want to overflow, so the order of operands and
3505 * the * 100 / 100 trick are important. We do a +1 to be
3506 * safe against division by zero. We only estimate anyway.
3507 *
3508 * dt: time from mark until now
3509 * db: blocks written from mark until now
3510 * rt: remaining time
3511 */
3512 dt = ((jiffies - mddev->resync_mark) / HZ);
3513 if (!dt) dt++;
3514 db = resync - (mddev->resync_mark_cnt/2);
3515 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
3516
3517 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
3518
3519 seq_printf(seq, " speed=%ldK/sec", db/dt);
3520 }
3521
3522 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
3523 {
3524 struct list_head *tmp;
3525 loff_t l = *pos;
3526 mddev_t *mddev;
3527
3528 if (l >= 0x10000)
3529 return NULL;
3530 if (!l--)
3531 /* header */
3532 return (void*)1;
3533
3534 spin_lock(&all_mddevs_lock);
3535 list_for_each(tmp,&all_mddevs)
3536 if (!l--) {
3537 mddev = list_entry(tmp, mddev_t, all_mddevs);
3538 mddev_get(mddev);
3539 spin_unlock(&all_mddevs_lock);
3540 return mddev;
3541 }
3542 spin_unlock(&all_mddevs_lock);
3543 if (!l--)
3544 return (void*)2;/* tail */
3545 return NULL;
3546 }
3547
3548 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3549 {
3550 struct list_head *tmp;
3551 mddev_t *next_mddev, *mddev = v;
3552
3553 ++*pos;
3554 if (v == (void*)2)
3555 return NULL;
3556
3557 spin_lock(&all_mddevs_lock);
3558 if (v == (void*)1)
3559 tmp = all_mddevs.next;
3560 else
3561 tmp = mddev->all_mddevs.next;
3562 if (tmp != &all_mddevs)
3563 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
3564 else {
3565 next_mddev = (void*)2;
3566 *pos = 0x10000;
3567 }
3568 spin_unlock(&all_mddevs_lock);
3569
3570 if (v != (void*)1)
3571 mddev_put(mddev);
3572 return next_mddev;
3573
3574 }
3575
3576 static void md_seq_stop(struct seq_file *seq, void *v)
3577 {
3578 mddev_t *mddev = v;
3579
3580 if (mddev && v != (void*)1 && v != (void*)2)
3581 mddev_put(mddev);
3582 }
3583
3584 static int md_seq_show(struct seq_file *seq, void *v)
3585 {
3586 mddev_t *mddev = v;
3587 sector_t size;
3588 struct list_head *tmp2;
3589 mdk_rdev_t *rdev;
3590 int i;
3591 struct bitmap *bitmap;
3592
3593 if (v == (void*)1) {
3594 seq_printf(seq, "Personalities : ");
3595 spin_lock(&pers_lock);
3596 for (i = 0; i < MAX_PERSONALITY; i++)
3597 if (pers[i])
3598 seq_printf(seq, "[%s] ", pers[i]->name);
3599
3600 spin_unlock(&pers_lock);
3601 seq_printf(seq, "\n");
3602 return 0;
3603 }
3604 if (v == (void*)2) {
3605 status_unused(seq);
3606 return 0;
3607 }
3608
3609 if (mddev_lock(mddev)!=0)
3610 return -EINTR;
3611 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
3612 seq_printf(seq, "%s : %sactive", mdname(mddev),
3613 mddev->pers ? "" : "in");
3614 if (mddev->pers) {
3615 if (mddev->ro)
3616 seq_printf(seq, " (read-only)");
3617 seq_printf(seq, " %s", mddev->pers->name);
3618 }
3619
3620 size = 0;
3621 ITERATE_RDEV(mddev,rdev,tmp2) {
3622 char b[BDEVNAME_SIZE];
3623 seq_printf(seq, " %s[%d]",
3624 bdevname(rdev->bdev,b), rdev->desc_nr);
3625 if (test_bit(WriteMostly, &rdev->flags))
3626 seq_printf(seq, "(W)");
3627 if (test_bit(Faulty, &rdev->flags)) {
3628 seq_printf(seq, "(F)");
3629 continue;
3630 } else if (rdev->raid_disk < 0)
3631 seq_printf(seq, "(S)"); /* spare */
3632 size += rdev->size;
3633 }
3634
3635 if (!list_empty(&mddev->disks)) {
3636 if (mddev->pers)
3637 seq_printf(seq, "\n %llu blocks",
3638 (unsigned long long)mddev->array_size);
3639 else
3640 seq_printf(seq, "\n %llu blocks",
3641 (unsigned long long)size);
3642 }
3643 if (mddev->persistent) {
3644 if (mddev->major_version != 0 ||
3645 mddev->minor_version != 90) {
3646 seq_printf(seq," super %d.%d",
3647 mddev->major_version,
3648 mddev->minor_version);
3649 }
3650 } else
3651 seq_printf(seq, " super non-persistent");
3652
3653 if (mddev->pers) {
3654 mddev->pers->status (seq, mddev);
3655 seq_printf(seq, "\n ");
3656 if (mddev->curr_resync > 2) {
3657 status_resync (seq, mddev);
3658 seq_printf(seq, "\n ");
3659 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
3660 seq_printf(seq, " resync=DELAYED\n ");
3661 } else
3662 seq_printf(seq, "\n ");
3663
3664 if ((bitmap = mddev->bitmap)) {
3665 unsigned long chunk_kb;
3666 unsigned long flags;
3667 spin_lock_irqsave(&bitmap->lock, flags);
3668 chunk_kb = bitmap->chunksize >> 10;
3669 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
3670 "%lu%s chunk",
3671 bitmap->pages - bitmap->missing_pages,
3672 bitmap->pages,
3673 (bitmap->pages - bitmap->missing_pages)
3674 << (PAGE_SHIFT - 10),
3675 chunk_kb ? chunk_kb : bitmap->chunksize,
3676 chunk_kb ? "KB" : "B");
3677 if (bitmap->file) {
3678 seq_printf(seq, ", file: ");
3679 seq_path(seq, bitmap->file->f_vfsmnt,
3680 bitmap->file->f_dentry," \t\n");
3681 }
3682
3683 seq_printf(seq, "\n");
3684 spin_unlock_irqrestore(&bitmap->lock, flags);
3685 }
3686
3687 seq_printf(seq, "\n");
3688 }
3689 mddev_unlock(mddev);
3690
3691 return 0;
3692 }
3693
3694 static struct seq_operations md_seq_ops = {
3695 .start = md_seq_start,
3696 .next = md_seq_next,
3697 .stop = md_seq_stop,
3698 .show = md_seq_show,
3699 };
3700
3701 static int md_seq_open(struct inode *inode, struct file *file)
3702 {
3703 int error;
3704
3705 error = seq_open(file, &md_seq_ops);
3706 return error;
3707 }
3708
3709 static struct file_operations md_seq_fops = {
3710 .open = md_seq_open,
3711 .read = seq_read,
3712 .llseek = seq_lseek,
3713 .release = seq_release,
3714 };
3715
3716 int register_md_personality(int pnum, mdk_personality_t *p)
3717 {
3718 if (pnum >= MAX_PERSONALITY) {
3719 printk(KERN_ERR
3720 "md: tried to install personality %s as nr %d, but max is %lu\n",
3721 p->name, pnum, MAX_PERSONALITY-1);
3722 return -EINVAL;
3723 }
3724
3725 spin_lock(&pers_lock);
3726 if (pers[pnum]) {
3727 spin_unlock(&pers_lock);
3728 return -EBUSY;
3729 }
3730
3731 pers[pnum] = p;
3732 printk(KERN_INFO "md: %s personality registered as nr %d\n", p->name, pnum);
3733 spin_unlock(&pers_lock);
3734 return 0;
3735 }
3736
3737 int unregister_md_personality(int pnum)
3738 {
3739 if (pnum >= MAX_PERSONALITY)
3740 return -EINVAL;
3741
3742 printk(KERN_INFO "md: %s personality unregistered\n", pers[pnum]->name);
3743 spin_lock(&pers_lock);
3744 pers[pnum] = NULL;
3745 spin_unlock(&pers_lock);
3746 return 0;
3747 }
3748
3749 static int is_mddev_idle(mddev_t *mddev)
3750 {
3751 mdk_rdev_t * rdev;
3752 struct list_head *tmp;
3753 int idle;
3754 unsigned long curr_events;
3755
3756 idle = 1;
3757 ITERATE_RDEV(mddev,rdev,tmp) {
3758 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
3759 curr_events = disk_stat_read(disk, sectors[0]) +
3760 disk_stat_read(disk, sectors[1]) -
3761 atomic_read(&disk->sync_io);
3762 /* Allow some slack between valud of curr_events and last_events,
3763 * as there are some uninteresting races.
3764 * Note: the following is an unsigned comparison.
3765 */
3766 if ((curr_events - rdev->last_events + 32) > 64) {
3767 rdev->last_events = curr_events;
3768 idle = 0;
3769 }
3770 }
3771 return idle;
3772 }
3773
3774 void md_done_sync(mddev_t *mddev, int blocks, int ok)
3775 {
3776 /* another "blocks" (512byte) blocks have been synced */
3777 atomic_sub(blocks, &mddev->recovery_active);
3778 wake_up(&mddev->recovery_wait);
3779 if (!ok) {
3780 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
3781 md_wakeup_thread(mddev->thread);
3782 // stop recovery, signal do_sync ....
3783 }
3784 }
3785
3786
3787 /* md_write_start(mddev, bi)
3788 * If we need to update some array metadata (e.g. 'active' flag
3789 * in superblock) before writing, schedule a superblock update
3790 * and wait for it to complete.
3791 */
3792 void md_write_start(mddev_t *mddev, struct bio *bi)
3793 {
3794 if (bio_data_dir(bi) != WRITE)
3795 return;
3796
3797 atomic_inc(&mddev->writes_pending);
3798 if (mddev->in_sync) {
3799 spin_lock(&mddev->write_lock);
3800 if (mddev->in_sync) {
3801 mddev->in_sync = 0;
3802 mddev->sb_dirty = 1;
3803 md_wakeup_thread(mddev->thread);
3804 }
3805 spin_unlock(&mddev->write_lock);
3806 }
3807 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
3808 }
3809
3810 void md_write_end(mddev_t *mddev)
3811 {
3812 if (atomic_dec_and_test(&mddev->writes_pending)) {
3813 if (mddev->safemode == 2)
3814 md_wakeup_thread(mddev->thread);
3815 else
3816 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
3817 }
3818 }
3819
3820 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
3821
3822 #define SYNC_MARKS 10
3823 #define SYNC_MARK_STEP (3*HZ)
3824 static void md_do_sync(mddev_t *mddev)
3825 {
3826 mddev_t *mddev2;
3827 unsigned int currspeed = 0,
3828 window;
3829 sector_t max_sectors,j, io_sectors;
3830 unsigned long mark[SYNC_MARKS];
3831 sector_t mark_cnt[SYNC_MARKS];
3832 int last_mark,m;
3833 struct list_head *tmp;
3834 sector_t last_check;
3835 int skipped = 0;
3836
3837 /* just incase thread restarts... */
3838 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
3839 return;
3840
3841 /* we overload curr_resync somewhat here.
3842 * 0 == not engaged in resync at all
3843 * 2 == checking that there is no conflict with another sync
3844 * 1 == like 2, but have yielded to allow conflicting resync to
3845 * commense
3846 * other == active in resync - this many blocks
3847 *
3848 * Before starting a resync we must have set curr_resync to
3849 * 2, and then checked that every "conflicting" array has curr_resync
3850 * less than ours. When we find one that is the same or higher
3851 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
3852 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
3853 * This will mean we have to start checking from the beginning again.
3854 *
3855 */
3856
3857 do {
3858 mddev->curr_resync = 2;
3859
3860 try_again:
3861 if (signal_pending(current) ||
3862 kthread_should_stop()) {
3863 flush_signals(current);
3864 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3865 goto skip;
3866 }
3867 ITERATE_MDDEV(mddev2,tmp) {
3868 if (mddev2 == mddev)
3869 continue;
3870 if (mddev2->curr_resync &&
3871 match_mddev_units(mddev,mddev2)) {
3872 DEFINE_WAIT(wq);
3873 if (mddev < mddev2 && mddev->curr_resync == 2) {
3874 /* arbitrarily yield */
3875 mddev->curr_resync = 1;
3876 wake_up(&resync_wait);
3877 }
3878 if (mddev > mddev2 && mddev->curr_resync == 1)
3879 /* no need to wait here, we can wait the next
3880 * time 'round when curr_resync == 2
3881 */
3882 continue;
3883 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
3884 if (!signal_pending(current) &&
3885 !kthread_should_stop() &&
3886 mddev2->curr_resync >= mddev->curr_resync) {
3887 printk(KERN_INFO "md: delaying resync of %s"
3888 " until %s has finished resync (they"
3889 " share one or more physical units)\n",
3890 mdname(mddev), mdname(mddev2));
3891 mddev_put(mddev2);
3892 schedule();
3893 finish_wait(&resync_wait, &wq);
3894 goto try_again;
3895 }
3896 finish_wait(&resync_wait, &wq);
3897 }
3898 }
3899 } while (mddev->curr_resync < 2);
3900
3901 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3902 /* resync follows the size requested by the personality,
3903 * which defaults to physical size, but can be virtual size
3904 */
3905 max_sectors = mddev->resync_max_sectors;
3906 mddev->resync_mismatches = 0;
3907 } else
3908 /* recovery follows the physical size of devices */
3909 max_sectors = mddev->size << 1;
3910
3911 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
3912 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
3913 " %d KB/sec/disc.\n", sysctl_speed_limit_min);
3914 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
3915 "(but not more than %d KB/sec) for reconstruction.\n",
3916 sysctl_speed_limit_max);
3917
3918 is_mddev_idle(mddev); /* this also initializes IO event counters */
3919 /* we don't use the checkpoint if there's a bitmap */
3920 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
3921 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3922 j = mddev->recovery_cp;
3923 else
3924 j = 0;
3925 io_sectors = 0;
3926 for (m = 0; m < SYNC_MARKS; m++) {
3927 mark[m] = jiffies;
3928 mark_cnt[m] = io_sectors;
3929 }
3930 last_mark = 0;
3931 mddev->resync_mark = mark[last_mark];
3932 mddev->resync_mark_cnt = mark_cnt[last_mark];
3933
3934 /*
3935 * Tune reconstruction:
3936 */
3937 window = 32*(PAGE_SIZE/512);
3938 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
3939 window/2,(unsigned long long) max_sectors/2);
3940
3941 atomic_set(&mddev->recovery_active, 0);
3942 init_waitqueue_head(&mddev->recovery_wait);
3943 last_check = 0;
3944
3945 if (j>2) {
3946 printk(KERN_INFO
3947 "md: resuming recovery of %s from checkpoint.\n",
3948 mdname(mddev));
3949 mddev->curr_resync = j;
3950 }
3951
3952 while (j < max_sectors) {
3953 sector_t sectors;
3954
3955 skipped = 0;
3956 sectors = mddev->pers->sync_request(mddev, j, &skipped,
3957 currspeed < sysctl_speed_limit_min);
3958 if (sectors == 0) {
3959 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
3960 goto out;
3961 }
3962
3963 if (!skipped) { /* actual IO requested */
3964 io_sectors += sectors;
3965 atomic_add(sectors, &mddev->recovery_active);
3966 }
3967
3968 j += sectors;
3969 if (j>1) mddev->curr_resync = j;
3970
3971
3972 if (last_check + window > io_sectors || j == max_sectors)
3973 continue;
3974
3975 last_check = io_sectors;
3976
3977 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
3978 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
3979 break;
3980
3981 repeat:
3982 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
3983 /* step marks */
3984 int next = (last_mark+1) % SYNC_MARKS;
3985
3986 mddev->resync_mark = mark[next];
3987 mddev->resync_mark_cnt = mark_cnt[next];
3988 mark[next] = jiffies;
3989 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
3990 last_mark = next;
3991 }
3992
3993
3994 if (signal_pending(current) || kthread_should_stop()) {
3995 /*
3996 * got a signal, exit.
3997 */
3998 printk(KERN_INFO
3999 "md: md_do_sync() got signal ... exiting\n");
4000 flush_signals(current);
4001 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4002 goto out;
4003 }
4004
4005 /*
4006 * this loop exits only if either when we are slower than
4007 * the 'hard' speed limit, or the system was IO-idle for
4008 * a jiffy.
4009 * the system might be non-idle CPU-wise, but we only care
4010 * about not overloading the IO subsystem. (things like an
4011 * e2fsck being done on the RAID array should execute fast)
4012 */
4013 mddev->queue->unplug_fn(mddev->queue);
4014 cond_resched();
4015
4016 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4017 /((jiffies-mddev->resync_mark)/HZ +1) +1;
4018
4019 if (currspeed > sysctl_speed_limit_min) {
4020 if ((currspeed > sysctl_speed_limit_max) ||
4021 !is_mddev_idle(mddev)) {
4022 msleep_interruptible(250);
4023 goto repeat;
4024 }
4025 }
4026 }
4027 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4028 /*
4029 * this also signals 'finished resyncing' to md_stop
4030 */
4031 out:
4032 mddev->queue->unplug_fn(mddev->queue);
4033
4034 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4035
4036 /* tell personality that we are finished */
4037 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
4038
4039 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4040 mddev->curr_resync > 2 &&
4041 mddev->curr_resync >= mddev->recovery_cp) {
4042 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4043 printk(KERN_INFO
4044 "md: checkpointing recovery of %s.\n",
4045 mdname(mddev));
4046 mddev->recovery_cp = mddev->curr_resync;
4047 } else
4048 mddev->recovery_cp = MaxSector;
4049 }
4050
4051 skip:
4052 mddev->curr_resync = 0;
4053 wake_up(&resync_wait);
4054 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4055 md_wakeup_thread(mddev->thread);
4056 }
4057
4058
4059 /*
4060 * This routine is regularly called by all per-raid-array threads to
4061 * deal with generic issues like resync and super-block update.
4062 * Raid personalities that don't have a thread (linear/raid0) do not
4063 * need this as they never do any recovery or update the superblock.
4064 *
4065 * It does not do any resync itself, but rather "forks" off other threads
4066 * to do that as needed.
4067 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4068 * "->recovery" and create a thread at ->sync_thread.
4069 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4070 * and wakeups up this thread which will reap the thread and finish up.
4071 * This thread also removes any faulty devices (with nr_pending == 0).
4072 *
4073 * The overall approach is:
4074 * 1/ if the superblock needs updating, update it.
4075 * 2/ If a recovery thread is running, don't do anything else.
4076 * 3/ If recovery has finished, clean up, possibly marking spares active.
4077 * 4/ If there are any faulty devices, remove them.
4078 * 5/ If array is degraded, try to add spares devices
4079 * 6/ If array has spares or is not in-sync, start a resync thread.
4080 */
4081 void md_check_recovery(mddev_t *mddev)
4082 {
4083 mdk_rdev_t *rdev;
4084 struct list_head *rtmp;
4085
4086
4087 if (mddev->bitmap)
4088 bitmap_daemon_work(mddev->bitmap);
4089
4090 if (mddev->ro)
4091 return;
4092
4093 if (signal_pending(current)) {
4094 if (mddev->pers->sync_request) {
4095 printk(KERN_INFO "md: %s in immediate safe mode\n",
4096 mdname(mddev));
4097 mddev->safemode = 2;
4098 }
4099 flush_signals(current);
4100 }
4101
4102 if ( ! (
4103 mddev->sb_dirty ||
4104 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
4105 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4106 (mddev->safemode == 1) ||
4107 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4108 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
4109 ))
4110 return;
4111
4112 if (mddev_trylock(mddev)==0) {
4113 int spares =0;
4114
4115 spin_lock(&mddev->write_lock);
4116 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4117 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4118 mddev->in_sync = 1;
4119 mddev->sb_dirty = 1;
4120 }
4121 if (mddev->safemode == 1)
4122 mddev->safemode = 0;
4123 spin_unlock(&mddev->write_lock);
4124
4125 if (mddev->sb_dirty)
4126 md_update_sb(mddev);
4127
4128
4129 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4130 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4131 /* resync/recovery still happening */
4132 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4133 goto unlock;
4134 }
4135 if (mddev->sync_thread) {
4136 /* resync has finished, collect result */
4137 md_unregister_thread(mddev->sync_thread);
4138 mddev->sync_thread = NULL;
4139 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4140 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4141 /* success...*/
4142 /* activate any spares */
4143 mddev->pers->spare_active(mddev);
4144 }
4145 md_update_sb(mddev);
4146
4147 /* if array is no-longer degraded, then any saved_raid_disk
4148 * information must be scrapped
4149 */
4150 if (!mddev->degraded)
4151 ITERATE_RDEV(mddev,rdev,rtmp)
4152 rdev->saved_raid_disk = -1;
4153
4154 mddev->recovery = 0;
4155 /* flag recovery needed just to double check */
4156 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4157 goto unlock;
4158 }
4159 /* Clear some bits that don't mean anything, but
4160 * might be left set
4161 */
4162 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4163 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4164 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4165 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
4166
4167 /* no recovery is running.
4168 * remove any failed drives, then
4169 * add spares if possible.
4170 * Spare are also removed and re-added, to allow
4171 * the personality to fail the re-add.
4172 */
4173 ITERATE_RDEV(mddev,rdev,rtmp)
4174 if (rdev->raid_disk >= 0 &&
4175 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
4176 atomic_read(&rdev->nr_pending)==0) {
4177 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4178 char nm[20];
4179 sprintf(nm,"rd%d", rdev->raid_disk);
4180 sysfs_remove_link(&mddev->kobj, nm);
4181 rdev->raid_disk = -1;
4182 }
4183 }
4184
4185 if (mddev->degraded) {
4186 ITERATE_RDEV(mddev,rdev,rtmp)
4187 if (rdev->raid_disk < 0
4188 && !test_bit(Faulty, &rdev->flags)) {
4189 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4190 char nm[20];
4191 sprintf(nm, "rd%d", rdev->raid_disk);
4192 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
4193 spares++;
4194 } else
4195 break;
4196 }
4197 }
4198
4199 if (spares) {
4200 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4201 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4202 } else if (mddev->recovery_cp < MaxSector) {
4203 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4204 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4205 /* nothing to be done ... */
4206 goto unlock;
4207
4208 if (mddev->pers->sync_request) {
4209 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4210 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4211 /* We are adding a device or devices to an array
4212 * which has the bitmap stored on all devices.
4213 * So make sure all bitmap pages get written
4214 */
4215 bitmap_write_all(mddev->bitmap);
4216 }
4217 mddev->sync_thread = md_register_thread(md_do_sync,
4218 mddev,
4219 "%s_resync");
4220 if (!mddev->sync_thread) {
4221 printk(KERN_ERR "%s: could not start resync"
4222 " thread...\n",
4223 mdname(mddev));
4224 /* leave the spares where they are, it shouldn't hurt */
4225 mddev->recovery = 0;
4226 } else {
4227 md_wakeup_thread(mddev->sync_thread);
4228 }
4229 }
4230 unlock:
4231 mddev_unlock(mddev);
4232 }
4233 }
4234
4235 static int md_notify_reboot(struct notifier_block *this,
4236 unsigned long code, void *x)
4237 {
4238 struct list_head *tmp;
4239 mddev_t *mddev;
4240
4241 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4242
4243 printk(KERN_INFO "md: stopping all md devices.\n");
4244
4245 ITERATE_MDDEV(mddev,tmp)
4246 if (mddev_trylock(mddev)==0)
4247 do_md_stop (mddev, 1);
4248 /*
4249 * certain more exotic SCSI devices are known to be
4250 * volatile wrt too early system reboots. While the
4251 * right place to handle this issue is the given
4252 * driver, we do want to have a safe RAID driver ...
4253 */
4254 mdelay(1000*1);
4255 }
4256 return NOTIFY_DONE;
4257 }
4258
4259 static struct notifier_block md_notifier = {
4260 .notifier_call = md_notify_reboot,
4261 .next = NULL,
4262 .priority = INT_MAX, /* before any real devices */
4263 };
4264
4265 static void md_geninit(void)
4266 {
4267 struct proc_dir_entry *p;
4268
4269 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4270
4271 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4272 if (p)
4273 p->proc_fops = &md_seq_fops;
4274 }
4275
4276 static int __init md_init(void)
4277 {
4278 int minor;
4279
4280 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4281 " MD_SB_DISKS=%d\n",
4282 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4283 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
4284 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR,
4285 BITMAP_MINOR);
4286
4287 if (register_blkdev(MAJOR_NR, "md"))
4288 return -1;
4289 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4290 unregister_blkdev(MAJOR_NR, "md");
4291 return -1;
4292 }
4293 devfs_mk_dir("md");
4294 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4295 md_probe, NULL, NULL);
4296 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4297 md_probe, NULL, NULL);
4298
4299 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4300 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4301 S_IFBLK|S_IRUSR|S_IWUSR,
4302 "md/%d", minor);
4303
4304 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4305 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4306 S_IFBLK|S_IRUSR|S_IWUSR,
4307 "md/mdp%d", minor);
4308
4309
4310 register_reboot_notifier(&md_notifier);
4311 raid_table_header = register_sysctl_table(raid_root_table, 1);
4312
4313 md_geninit();
4314 return (0);
4315 }
4316
4317
4318 #ifndef MODULE
4319
4320 /*
4321 * Searches all registered partitions for autorun RAID arrays
4322 * at boot time.
4323 */
4324 static dev_t detected_devices[128];
4325 static int dev_cnt;
4326
4327 void md_autodetect_dev(dev_t dev)
4328 {
4329 if (dev_cnt >= 0 && dev_cnt < 127)
4330 detected_devices[dev_cnt++] = dev;
4331 }
4332
4333
4334 static void autostart_arrays(int part)
4335 {
4336 mdk_rdev_t *rdev;
4337 int i;
4338
4339 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4340
4341 for (i = 0; i < dev_cnt; i++) {
4342 dev_t dev = detected_devices[i];
4343
4344 rdev = md_import_device(dev,0, 0);
4345 if (IS_ERR(rdev))
4346 continue;
4347
4348 if (test_bit(Faulty, &rdev->flags)) {
4349 MD_BUG();
4350 continue;
4351 }
4352 list_add(&rdev->same_set, &pending_raid_disks);
4353 }
4354 dev_cnt = 0;
4355
4356 autorun_devices(part);
4357 }
4358
4359 #endif
4360
4361 static __exit void md_exit(void)
4362 {
4363 mddev_t *mddev;
4364 struct list_head *tmp;
4365 int i;
4366 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4367 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4368 for (i=0; i < MAX_MD_DEVS; i++)
4369 devfs_remove("md/%d", i);
4370 for (i=0; i < MAX_MD_DEVS; i++)
4371 devfs_remove("md/d%d", i);
4372
4373 devfs_remove("md");
4374
4375 unregister_blkdev(MAJOR_NR,"md");
4376 unregister_blkdev(mdp_major, "mdp");
4377 unregister_reboot_notifier(&md_notifier);
4378 unregister_sysctl_table(raid_table_header);
4379 remove_proc_entry("mdstat", NULL);
4380 ITERATE_MDDEV(mddev,tmp) {
4381 struct gendisk *disk = mddev->gendisk;
4382 if (!disk)
4383 continue;
4384 export_array(mddev);
4385 del_gendisk(disk);
4386 put_disk(disk);
4387 mddev->gendisk = NULL;
4388 mddev_put(mddev);
4389 }
4390 }
4391
4392 module_init(md_init)
4393 module_exit(md_exit)
4394
4395 EXPORT_SYMBOL(register_md_personality);
4396 EXPORT_SYMBOL(unregister_md_personality);
4397 EXPORT_SYMBOL(md_error);
4398 EXPORT_SYMBOL(md_done_sync);
4399 EXPORT_SYMBOL(md_write_start);
4400 EXPORT_SYMBOL(md_write_end);
4401 EXPORT_SYMBOL(md_register_thread);
4402 EXPORT_SYMBOL(md_unregister_thread);
4403 EXPORT_SYMBOL(md_wakeup_thread);
4404 EXPORT_SYMBOL(md_print_devices);
4405 EXPORT_SYMBOL(md_check_recovery);
4406 MODULE_LICENSE("GPL");
4407 MODULE_ALIAS("md");
4408 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);
x86 "subsystem" repository