2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
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>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
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)
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.
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 #include <linux/poll.h>
47 #include <linux/init.h>
49 #include <linux/file.h>
52 #include <linux/kmod.h>
55 #include <asm/unaligned.h>
57 #define MAJOR_NR MD_MAJOR
60 /* 63 partitions with the alternate major number (mdp) */
61 #define MdpMinorShift 6
64 #define dprintk(x...) ((void)(DEBUG && printk(x)))
68 static void autostart_arrays (int part);
71 static LIST_HEAD(pers_list);
72 static DEFINE_SPINLOCK(pers_lock);
75 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
76 * is 1000 KB/sec, so the extra system load does not show up that much.
77 * Increase it if you want to have more _guaranteed_ speed. Note that
78 * the RAID driver will use the maximum available bandwidth if the IO
79 * subsystem is idle. There is also an 'absolute maximum' reconstruction
80 * speed limit - in case reconstruction slows down your system despite
83 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
86 static int sysctl_speed_limit_min = 1000;
87 static int sysctl_speed_limit_max = 200000;
89 static struct ctl_table_header *raid_table_header;
91 static ctl_table raid_table[] = {
93 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
94 .procname = "speed_limit_min",
95 .data = &sysctl_speed_limit_min,
96 .maxlen = sizeof(int),
98 .proc_handler = &proc_dointvec,
101 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
102 .procname = "speed_limit_max",
103 .data = &sysctl_speed_limit_max,
104 .maxlen = sizeof(int),
106 .proc_handler = &proc_dointvec,
111 static ctl_table raid_dir_table[] = {
113 .ctl_name = DEV_RAID,
122 static ctl_table raid_root_table[] = {
128 .child = raid_dir_table,
133 static struct block_device_operations md_fops;
135 static int start_readonly;
138 * We have a system wide 'event count' that is incremented
139 * on any 'interesting' event, and readers of /proc/mdstat
140 * can use 'poll' or 'select' to find out when the event
144 * start array, stop array, error, add device, remove device,
145 * start build, activate spare
147 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
148 static atomic_t md_event_count;
149 static void md_new_event(mddev_t *mddev)
151 atomic_inc(&md_event_count);
152 wake_up(&md_event_waiters);
156 * Enables to iterate over all existing md arrays
157 * all_mddevs_lock protects this list.
159 static LIST_HEAD(all_mddevs);
160 static DEFINE_SPINLOCK(all_mddevs_lock);
164 * iterates through all used mddevs in the system.
165 * We take care to grab the all_mddevs_lock whenever navigating
166 * the list, and to always hold a refcount when unlocked.
167 * Any code which breaks out of this loop while own
168 * a reference to the current mddev and must mddev_put it.
170 #define ITERATE_MDDEV(mddev,tmp) \
172 for (({ spin_lock(&all_mddevs_lock); \
173 tmp = all_mddevs.next; \
175 ({ if (tmp != &all_mddevs) \
176 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
177 spin_unlock(&all_mddevs_lock); \
178 if (mddev) mddev_put(mddev); \
179 mddev = list_entry(tmp, mddev_t, all_mddevs); \
180 tmp != &all_mddevs;}); \
181 ({ spin_lock(&all_mddevs_lock); \
186 static int md_fail_request (request_queue_t *q, struct bio *bio)
188 bio_io_error(bio, bio->bi_size);
192 static inline mddev_t *mddev_get(mddev_t *mddev)
194 atomic_inc(&mddev->active);
198 static void mddev_put(mddev_t *mddev)
200 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
202 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
203 list_del(&mddev->all_mddevs);
204 blk_put_queue(mddev->queue);
205 kobject_unregister(&mddev->kobj);
207 spin_unlock(&all_mddevs_lock);
210 static mddev_t * mddev_find(dev_t unit)
212 mddev_t *mddev, *new = NULL;
215 spin_lock(&all_mddevs_lock);
216 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
217 if (mddev->unit == unit) {
219 spin_unlock(&all_mddevs_lock);
225 list_add(&new->all_mddevs, &all_mddevs);
226 spin_unlock(&all_mddevs_lock);
229 spin_unlock(&all_mddevs_lock);
231 new = kzalloc(sizeof(*new), GFP_KERNEL);
236 if (MAJOR(unit) == MD_MAJOR)
237 new->md_minor = MINOR(unit);
239 new->md_minor = MINOR(unit) >> MdpMinorShift;
241 init_MUTEX(&new->reconfig_sem);
242 INIT_LIST_HEAD(&new->disks);
243 INIT_LIST_HEAD(&new->all_mddevs);
244 init_timer(&new->safemode_timer);
245 atomic_set(&new->active, 1);
246 spin_lock_init(&new->write_lock);
247 init_waitqueue_head(&new->sb_wait);
249 new->queue = blk_alloc_queue(GFP_KERNEL);
255 blk_queue_make_request(new->queue, md_fail_request);
260 static inline int mddev_lock(mddev_t * mddev)
262 return down_interruptible(&mddev->reconfig_sem);
265 static inline void mddev_lock_uninterruptible(mddev_t * mddev)
267 down(&mddev->reconfig_sem);
270 static inline int mddev_trylock(mddev_t * mddev)
272 return down_trylock(&mddev->reconfig_sem);
275 static inline void mddev_unlock(mddev_t * mddev)
277 up(&mddev->reconfig_sem);
279 md_wakeup_thread(mddev->thread);
282 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
285 struct list_head *tmp;
287 ITERATE_RDEV(mddev,rdev,tmp) {
288 if (rdev->desc_nr == nr)
294 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
296 struct list_head *tmp;
299 ITERATE_RDEV(mddev,rdev,tmp) {
300 if (rdev->bdev->bd_dev == dev)
306 static struct mdk_personality *find_pers(int level, char *clevel)
308 struct mdk_personality *pers;
309 list_for_each_entry(pers, &pers_list, list) {
310 if (level != LEVEL_NONE && pers->level == level)
312 if (strcmp(pers->name, clevel)==0)
318 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
320 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
321 return MD_NEW_SIZE_BLOCKS(size);
324 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
328 size = rdev->sb_offset;
331 size &= ~((sector_t)chunk_size/1024 - 1);
335 static int alloc_disk_sb(mdk_rdev_t * rdev)
340 rdev->sb_page = alloc_page(GFP_KERNEL);
341 if (!rdev->sb_page) {
342 printk(KERN_ALERT "md: out of memory.\n");
349 static void free_disk_sb(mdk_rdev_t * rdev)
352 put_page(rdev->sb_page);
354 rdev->sb_page = NULL;
361 static int super_written(struct bio *bio, unsigned int bytes_done, int error)
363 mdk_rdev_t *rdev = bio->bi_private;
364 mddev_t *mddev = rdev->mddev;
368 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
369 md_error(mddev, rdev);
371 if (atomic_dec_and_test(&mddev->pending_writes))
372 wake_up(&mddev->sb_wait);
377 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
379 struct bio *bio2 = bio->bi_private;
380 mdk_rdev_t *rdev = bio2->bi_private;
381 mddev_t *mddev = rdev->mddev;
385 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
386 error == -EOPNOTSUPP) {
388 /* barriers don't appear to be supported :-( */
389 set_bit(BarriersNotsupp, &rdev->flags);
390 mddev->barriers_work = 0;
391 spin_lock_irqsave(&mddev->write_lock, flags);
392 bio2->bi_next = mddev->biolist;
393 mddev->biolist = bio2;
394 spin_unlock_irqrestore(&mddev->write_lock, flags);
395 wake_up(&mddev->sb_wait);
400 bio->bi_private = rdev;
401 return super_written(bio, bytes_done, error);
404 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
405 sector_t sector, int size, struct page *page)
407 /* write first size bytes of page to sector of rdev
408 * Increment mddev->pending_writes before returning
409 * and decrement it on completion, waking up sb_wait
410 * if zero is reached.
411 * If an error occurred, call md_error
413 * As we might need to resubmit the request if BIO_RW_BARRIER
414 * causes ENOTSUPP, we allocate a spare bio...
416 struct bio *bio = bio_alloc(GFP_NOIO, 1);
417 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
419 bio->bi_bdev = rdev->bdev;
420 bio->bi_sector = sector;
421 bio_add_page(bio, page, size, 0);
422 bio->bi_private = rdev;
423 bio->bi_end_io = super_written;
426 atomic_inc(&mddev->pending_writes);
427 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
429 rw |= (1<<BIO_RW_BARRIER);
430 rbio = bio_clone(bio, GFP_NOIO);
431 rbio->bi_private = bio;
432 rbio->bi_end_io = super_written_barrier;
433 submit_bio(rw, rbio);
438 void md_super_wait(mddev_t *mddev)
440 /* wait for all superblock writes that were scheduled to complete.
441 * if any had to be retried (due to BARRIER problems), retry them
445 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
446 if (atomic_read(&mddev->pending_writes)==0)
448 while (mddev->biolist) {
450 spin_lock_irq(&mddev->write_lock);
451 bio = mddev->biolist;
452 mddev->biolist = bio->bi_next ;
454 spin_unlock_irq(&mddev->write_lock);
455 submit_bio(bio->bi_rw, bio);
459 finish_wait(&mddev->sb_wait, &wq);
462 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
467 complete((struct completion*)bio->bi_private);
471 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
472 struct page *page, int rw)
474 struct bio *bio = bio_alloc(GFP_NOIO, 1);
475 struct completion event;
478 rw |= (1 << BIO_RW_SYNC);
481 bio->bi_sector = sector;
482 bio_add_page(bio, page, size, 0);
483 init_completion(&event);
484 bio->bi_private = &event;
485 bio->bi_end_io = bi_complete;
487 wait_for_completion(&event);
489 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
493 EXPORT_SYMBOL_GPL(sync_page_io);
495 static int read_disk_sb(mdk_rdev_t * rdev, int size)
497 char b[BDEVNAME_SIZE];
498 if (!rdev->sb_page) {
506 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
512 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
513 bdevname(rdev->bdev,b));
517 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
519 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
520 (sb1->set_uuid1 == sb2->set_uuid1) &&
521 (sb1->set_uuid2 == sb2->set_uuid2) &&
522 (sb1->set_uuid3 == sb2->set_uuid3))
530 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
533 mdp_super_t *tmp1, *tmp2;
535 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
536 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
538 if (!tmp1 || !tmp2) {
540 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
548 * nr_disks is not constant
553 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
564 static unsigned int calc_sb_csum(mdp_super_t * sb)
566 unsigned int disk_csum, csum;
568 disk_csum = sb->sb_csum;
570 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
571 sb->sb_csum = disk_csum;
577 * Handle superblock details.
578 * We want to be able to handle multiple superblock formats
579 * so we have a common interface to them all, and an array of
580 * different handlers.
581 * We rely on user-space to write the initial superblock, and support
582 * reading and updating of superblocks.
583 * Interface methods are:
584 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
585 * loads and validates a superblock on dev.
586 * if refdev != NULL, compare superblocks on both devices
588 * 0 - dev has a superblock that is compatible with refdev
589 * 1 - dev has a superblock that is compatible and newer than refdev
590 * so dev should be used as the refdev in future
591 * -EINVAL superblock incompatible or invalid
592 * -othererror e.g. -EIO
594 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
595 * Verify that dev is acceptable into mddev.
596 * The first time, mddev->raid_disks will be 0, and data from
597 * dev should be merged in. Subsequent calls check that dev
598 * is new enough. Return 0 or -EINVAL
600 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
601 * Update the superblock for rdev with data in mddev
602 * This does not write to disc.
608 struct module *owner;
609 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
610 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
611 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
615 * load_super for 0.90.0
617 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
619 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
625 * Calculate the position of the superblock,
626 * it's at the end of the disk.
628 * It also happens to be a multiple of 4Kb.
630 sb_offset = calc_dev_sboffset(rdev->bdev);
631 rdev->sb_offset = sb_offset;
633 ret = read_disk_sb(rdev, MD_SB_BYTES);
638 bdevname(rdev->bdev, b);
639 sb = (mdp_super_t*)page_address(rdev->sb_page);
641 if (sb->md_magic != MD_SB_MAGIC) {
642 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
647 if (sb->major_version != 0 ||
648 sb->minor_version != 90) {
649 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
650 sb->major_version, sb->minor_version,
655 if (sb->raid_disks <= 0)
658 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
659 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
664 rdev->preferred_minor = sb->md_minor;
665 rdev->data_offset = 0;
666 rdev->sb_size = MD_SB_BYTES;
668 if (sb->level == LEVEL_MULTIPATH)
671 rdev->desc_nr = sb->this_disk.number;
677 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
678 if (!uuid_equal(refsb, sb)) {
679 printk(KERN_WARNING "md: %s has different UUID to %s\n",
680 b, bdevname(refdev->bdev,b2));
683 if (!sb_equal(refsb, sb)) {
684 printk(KERN_WARNING "md: %s has same UUID"
685 " but different superblock to %s\n",
686 b, bdevname(refdev->bdev, b2));
690 ev2 = md_event(refsb);
696 rdev->size = calc_dev_size(rdev, sb->chunk_size);
698 if (rdev->size < sb->size && sb->level > 1)
699 /* "this cannot possibly happen" ... */
707 * validate_super for 0.90.0
709 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
712 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
714 rdev->raid_disk = -1;
716 if (mddev->raid_disks == 0) {
717 mddev->major_version = 0;
718 mddev->minor_version = sb->minor_version;
719 mddev->patch_version = sb->patch_version;
720 mddev->persistent = ! sb->not_persistent;
721 mddev->chunk_size = sb->chunk_size;
722 mddev->ctime = sb->ctime;
723 mddev->utime = sb->utime;
724 mddev->level = sb->level;
725 mddev->clevel[0] = 0;
726 mddev->layout = sb->layout;
727 mddev->raid_disks = sb->raid_disks;
728 mddev->size = sb->size;
729 mddev->events = md_event(sb);
730 mddev->bitmap_offset = 0;
731 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
733 if (sb->state & (1<<MD_SB_CLEAN))
734 mddev->recovery_cp = MaxSector;
736 if (sb->events_hi == sb->cp_events_hi &&
737 sb->events_lo == sb->cp_events_lo) {
738 mddev->recovery_cp = sb->recovery_cp;
740 mddev->recovery_cp = 0;
743 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
744 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
745 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
746 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
748 mddev->max_disks = MD_SB_DISKS;
750 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
751 mddev->bitmap_file == NULL) {
752 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
753 && mddev->level != 10) {
754 /* FIXME use a better test */
755 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
758 mddev->bitmap_offset = mddev->default_bitmap_offset;
761 } else if (mddev->pers == NULL) {
762 /* Insist on good event counter while assembling */
763 __u64 ev1 = md_event(sb);
765 if (ev1 < mddev->events)
767 } else if (mddev->bitmap) {
768 /* if adding to array with a bitmap, then we can accept an
769 * older device ... but not too old.
771 __u64 ev1 = md_event(sb);
772 if (ev1 < mddev->bitmap->events_cleared)
774 } else /* just a hot-add of a new device, leave raid_disk at -1 */
777 if (mddev->level != LEVEL_MULTIPATH) {
778 desc = sb->disks + rdev->desc_nr;
780 if (desc->state & (1<<MD_DISK_FAULTY))
781 set_bit(Faulty, &rdev->flags);
782 else if (desc->state & (1<<MD_DISK_SYNC) &&
783 desc->raid_disk < mddev->raid_disks) {
784 set_bit(In_sync, &rdev->flags);
785 rdev->raid_disk = desc->raid_disk;
787 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
788 set_bit(WriteMostly, &rdev->flags);
789 } else /* MULTIPATH are always insync */
790 set_bit(In_sync, &rdev->flags);
795 * sync_super for 0.90.0
797 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
800 struct list_head *tmp;
802 int next_spare = mddev->raid_disks;
805 /* make rdev->sb match mddev data..
808 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
809 * 3/ any empty disks < next_spare become removed
811 * disks[0] gets initialised to REMOVED because
812 * we cannot be sure from other fields if it has
813 * been initialised or not.
816 int active=0, working=0,failed=0,spare=0,nr_disks=0;
818 rdev->sb_size = MD_SB_BYTES;
820 sb = (mdp_super_t*)page_address(rdev->sb_page);
822 memset(sb, 0, sizeof(*sb));
824 sb->md_magic = MD_SB_MAGIC;
825 sb->major_version = mddev->major_version;
826 sb->minor_version = mddev->minor_version;
827 sb->patch_version = mddev->patch_version;
828 sb->gvalid_words = 0; /* ignored */
829 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
830 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
831 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
832 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
834 sb->ctime = mddev->ctime;
835 sb->level = mddev->level;
836 sb->size = mddev->size;
837 sb->raid_disks = mddev->raid_disks;
838 sb->md_minor = mddev->md_minor;
839 sb->not_persistent = !mddev->persistent;
840 sb->utime = mddev->utime;
842 sb->events_hi = (mddev->events>>32);
843 sb->events_lo = (u32)mddev->events;
847 sb->recovery_cp = mddev->recovery_cp;
848 sb->cp_events_hi = (mddev->events>>32);
849 sb->cp_events_lo = (u32)mddev->events;
850 if (mddev->recovery_cp == MaxSector)
851 sb->state = (1<< MD_SB_CLEAN);
855 sb->layout = mddev->layout;
856 sb->chunk_size = mddev->chunk_size;
858 if (mddev->bitmap && mddev->bitmap_file == NULL)
859 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
861 sb->disks[0].state = (1<<MD_DISK_REMOVED);
862 ITERATE_RDEV(mddev,rdev2,tmp) {
865 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
866 && !test_bit(Faulty, &rdev2->flags))
867 desc_nr = rdev2->raid_disk;
869 desc_nr = next_spare++;
870 rdev2->desc_nr = desc_nr;
871 d = &sb->disks[rdev2->desc_nr];
873 d->number = rdev2->desc_nr;
874 d->major = MAJOR(rdev2->bdev->bd_dev);
875 d->minor = MINOR(rdev2->bdev->bd_dev);
876 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
877 && !test_bit(Faulty, &rdev2->flags))
878 d->raid_disk = rdev2->raid_disk;
880 d->raid_disk = rdev2->desc_nr; /* compatibility */
881 if (test_bit(Faulty, &rdev2->flags)) {
882 d->state = (1<<MD_DISK_FAULTY);
884 } else if (test_bit(In_sync, &rdev2->flags)) {
885 d->state = (1<<MD_DISK_ACTIVE);
886 d->state |= (1<<MD_DISK_SYNC);
894 if (test_bit(WriteMostly, &rdev2->flags))
895 d->state |= (1<<MD_DISK_WRITEMOSTLY);
897 /* now set the "removed" and "faulty" bits on any missing devices */
898 for (i=0 ; i < mddev->raid_disks ; i++) {
899 mdp_disk_t *d = &sb->disks[i];
900 if (d->state == 0 && d->number == 0) {
903 d->state = (1<<MD_DISK_REMOVED);
904 d->state |= (1<<MD_DISK_FAULTY);
908 sb->nr_disks = nr_disks;
909 sb->active_disks = active;
910 sb->working_disks = working;
911 sb->failed_disks = failed;
912 sb->spare_disks = spare;
914 sb->this_disk = sb->disks[rdev->desc_nr];
915 sb->sb_csum = calc_sb_csum(sb);
919 * version 1 superblock
922 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
924 unsigned int disk_csum, csum;
925 unsigned long long newcsum;
926 int size = 256 + le32_to_cpu(sb->max_dev)*2;
927 unsigned int *isuper = (unsigned int*)sb;
930 disk_csum = sb->sb_csum;
933 for (i=0; size>=4; size -= 4 )
934 newcsum += le32_to_cpu(*isuper++);
937 newcsum += le16_to_cpu(*(unsigned short*) isuper);
939 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
940 sb->sb_csum = disk_csum;
941 return cpu_to_le32(csum);
944 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
946 struct mdp_superblock_1 *sb;
949 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
953 * Calculate the position of the superblock.
954 * It is always aligned to a 4K boundary and
955 * depeding on minor_version, it can be:
956 * 0: At least 8K, but less than 12K, from end of device
957 * 1: At start of device
958 * 2: 4K from start of device.
960 switch(minor_version) {
962 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
964 sb_offset &= ~(sector_t)(4*2-1);
965 /* convert from sectors to K */
977 rdev->sb_offset = sb_offset;
979 /* superblock is rarely larger than 1K, but it can be larger,
980 * and it is safe to read 4k, so we do that
982 ret = read_disk_sb(rdev, 4096);
986 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
988 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
989 sb->major_version != cpu_to_le32(1) ||
990 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
991 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
992 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
995 if (calc_sb_1_csum(sb) != sb->sb_csum) {
996 printk("md: invalid superblock checksum on %s\n",
997 bdevname(rdev->bdev,b));
1000 if (le64_to_cpu(sb->data_size) < 10) {
1001 printk("md: data_size too small on %s\n",
1002 bdevname(rdev->bdev,b));
1005 rdev->preferred_minor = 0xffff;
1006 rdev->data_offset = le64_to_cpu(sb->data_offset);
1007 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1009 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1010 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1011 if (rdev->sb_size & bmask)
1012 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1018 struct mdp_superblock_1 *refsb =
1019 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1021 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1022 sb->level != refsb->level ||
1023 sb->layout != refsb->layout ||
1024 sb->chunksize != refsb->chunksize) {
1025 printk(KERN_WARNING "md: %s has strangely different"
1026 " superblock to %s\n",
1027 bdevname(rdev->bdev,b),
1028 bdevname(refdev->bdev,b2));
1031 ev1 = le64_to_cpu(sb->events);
1032 ev2 = le64_to_cpu(refsb->events);
1038 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1040 rdev->size = rdev->sb_offset;
1041 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1043 rdev->size = le64_to_cpu(sb->data_size)/2;
1044 if (le32_to_cpu(sb->chunksize))
1045 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1047 if (le32_to_cpu(sb->size) > rdev->size*2)
1052 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1054 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1056 rdev->raid_disk = -1;
1058 if (mddev->raid_disks == 0) {
1059 mddev->major_version = 1;
1060 mddev->patch_version = 0;
1061 mddev->persistent = 1;
1062 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1063 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1064 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1065 mddev->level = le32_to_cpu(sb->level);
1066 mddev->clevel[0] = 0;
1067 mddev->layout = le32_to_cpu(sb->layout);
1068 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1069 mddev->size = le64_to_cpu(sb->size)/2;
1070 mddev->events = le64_to_cpu(sb->events);
1071 mddev->bitmap_offset = 0;
1072 mddev->default_bitmap_offset = 1024;
1074 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1075 memcpy(mddev->uuid, sb->set_uuid, 16);
1077 mddev->max_disks = (4096-256)/2;
1079 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1080 mddev->bitmap_file == NULL ) {
1081 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1082 && mddev->level != 10) {
1083 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
1086 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1088 } else if (mddev->pers == NULL) {
1089 /* Insist of good event counter while assembling */
1090 __u64 ev1 = le64_to_cpu(sb->events);
1092 if (ev1 < mddev->events)
1094 } else if (mddev->bitmap) {
1095 /* If adding to array with a bitmap, then we can accept an
1096 * older device, but not too old.
1098 __u64 ev1 = le64_to_cpu(sb->events);
1099 if (ev1 < mddev->bitmap->events_cleared)
1101 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1104 if (mddev->level != LEVEL_MULTIPATH) {
1106 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1107 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1109 case 0xffff: /* spare */
1111 case 0xfffe: /* faulty */
1112 set_bit(Faulty, &rdev->flags);
1115 set_bit(In_sync, &rdev->flags);
1116 rdev->raid_disk = role;
1119 if (sb->devflags & WriteMostly1)
1120 set_bit(WriteMostly, &rdev->flags);
1121 } else /* MULTIPATH are always insync */
1122 set_bit(In_sync, &rdev->flags);
1127 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1129 struct mdp_superblock_1 *sb;
1130 struct list_head *tmp;
1133 /* make rdev->sb match mddev and rdev data. */
1135 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1137 sb->feature_map = 0;
1139 memset(sb->pad1, 0, sizeof(sb->pad1));
1140 memset(sb->pad2, 0, sizeof(sb->pad2));
1141 memset(sb->pad3, 0, sizeof(sb->pad3));
1143 sb->utime = cpu_to_le64((__u64)mddev->utime);
1144 sb->events = cpu_to_le64(mddev->events);
1146 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1148 sb->resync_offset = cpu_to_le64(0);
1150 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1152 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1153 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1154 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1158 ITERATE_RDEV(mddev,rdev2,tmp)
1159 if (rdev2->desc_nr+1 > max_dev)
1160 max_dev = rdev2->desc_nr+1;
1162 sb->max_dev = cpu_to_le32(max_dev);
1163 for (i=0; i<max_dev;i++)
1164 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1166 ITERATE_RDEV(mddev,rdev2,tmp) {
1168 if (test_bit(Faulty, &rdev2->flags))
1169 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1170 else if (test_bit(In_sync, &rdev2->flags))
1171 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1173 sb->dev_roles[i] = cpu_to_le16(0xffff);
1176 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1177 sb->sb_csum = calc_sb_1_csum(sb);
1181 static struct super_type super_types[] = {
1184 .owner = THIS_MODULE,
1185 .load_super = super_90_load,
1186 .validate_super = super_90_validate,
1187 .sync_super = super_90_sync,
1191 .owner = THIS_MODULE,
1192 .load_super = super_1_load,
1193 .validate_super = super_1_validate,
1194 .sync_super = super_1_sync,
1198 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1200 struct list_head *tmp;
1203 ITERATE_RDEV(mddev,rdev,tmp)
1204 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1210 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1212 struct list_head *tmp;
1215 ITERATE_RDEV(mddev1,rdev,tmp)
1216 if (match_dev_unit(mddev2, rdev))
1222 static LIST_HEAD(pending_raid_disks);
1224 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1226 mdk_rdev_t *same_pdev;
1227 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1234 /* make sure rdev->size exceeds mddev->size */
1235 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1237 /* Cannot change size, so fail */
1240 mddev->size = rdev->size;
1242 same_pdev = match_dev_unit(mddev, rdev);
1245 "%s: WARNING: %s appears to be on the same physical"
1246 " disk as %s. True\n protection against single-disk"
1247 " failure might be compromised.\n",
1248 mdname(mddev), bdevname(rdev->bdev,b),
1249 bdevname(same_pdev->bdev,b2));
1251 /* Verify rdev->desc_nr is unique.
1252 * If it is -1, assign a free number, else
1253 * check number is not in use
1255 if (rdev->desc_nr < 0) {
1257 if (mddev->pers) choice = mddev->raid_disks;
1258 while (find_rdev_nr(mddev, choice))
1260 rdev->desc_nr = choice;
1262 if (find_rdev_nr(mddev, rdev->desc_nr))
1265 bdevname(rdev->bdev,b);
1266 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1269 list_add(&rdev->same_set, &mddev->disks);
1270 rdev->mddev = mddev;
1271 printk(KERN_INFO "md: bind<%s>\n", b);
1273 rdev->kobj.parent = &mddev->kobj;
1274 kobject_add(&rdev->kobj);
1276 if (rdev->bdev->bd_part)
1277 ko = &rdev->bdev->bd_part->kobj;
1279 ko = &rdev->bdev->bd_disk->kobj;
1280 sysfs_create_link(&rdev->kobj, ko, "block");
1284 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1286 char b[BDEVNAME_SIZE];
1291 list_del_init(&rdev->same_set);
1292 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1294 sysfs_remove_link(&rdev->kobj, "block");
1295 kobject_del(&rdev->kobj);
1299 * prevent the device from being mounted, repartitioned or
1300 * otherwise reused by a RAID array (or any other kernel
1301 * subsystem), by bd_claiming the device.
1303 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1306 struct block_device *bdev;
1307 char b[BDEVNAME_SIZE];
1309 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1311 printk(KERN_ERR "md: could not open %s.\n",
1312 __bdevname(dev, b));
1313 return PTR_ERR(bdev);
1315 err = bd_claim(bdev, rdev);
1317 printk(KERN_ERR "md: could not bd_claim %s.\n",
1326 static void unlock_rdev(mdk_rdev_t *rdev)
1328 struct block_device *bdev = rdev->bdev;
1336 void md_autodetect_dev(dev_t dev);
1338 static void export_rdev(mdk_rdev_t * rdev)
1340 char b[BDEVNAME_SIZE];
1341 printk(KERN_INFO "md: export_rdev(%s)\n",
1342 bdevname(rdev->bdev,b));
1346 list_del_init(&rdev->same_set);
1348 md_autodetect_dev(rdev->bdev->bd_dev);
1351 kobject_put(&rdev->kobj);
1354 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1356 unbind_rdev_from_array(rdev);
1360 static void export_array(mddev_t *mddev)
1362 struct list_head *tmp;
1365 ITERATE_RDEV(mddev,rdev,tmp) {
1370 kick_rdev_from_array(rdev);
1372 if (!list_empty(&mddev->disks))
1374 mddev->raid_disks = 0;
1375 mddev->major_version = 0;
1378 static void print_desc(mdp_disk_t *desc)
1380 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1381 desc->major,desc->minor,desc->raid_disk,desc->state);
1384 static void print_sb(mdp_super_t *sb)
1389 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1390 sb->major_version, sb->minor_version, sb->patch_version,
1391 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1393 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1394 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1395 sb->md_minor, sb->layout, sb->chunk_size);
1396 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1397 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1398 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1399 sb->failed_disks, sb->spare_disks,
1400 sb->sb_csum, (unsigned long)sb->events_lo);
1403 for (i = 0; i < MD_SB_DISKS; i++) {
1406 desc = sb->disks + i;
1407 if (desc->number || desc->major || desc->minor ||
1408 desc->raid_disk || (desc->state && (desc->state != 4))) {
1409 printk(" D %2d: ", i);
1413 printk(KERN_INFO "md: THIS: ");
1414 print_desc(&sb->this_disk);
1418 static void print_rdev(mdk_rdev_t *rdev)
1420 char b[BDEVNAME_SIZE];
1421 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1422 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1423 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1425 if (rdev->sb_loaded) {
1426 printk(KERN_INFO "md: rdev superblock:\n");
1427 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1429 printk(KERN_INFO "md: no rdev superblock!\n");
1432 void md_print_devices(void)
1434 struct list_head *tmp, *tmp2;
1437 char b[BDEVNAME_SIZE];
1440 printk("md: **********************************\n");
1441 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1442 printk("md: **********************************\n");
1443 ITERATE_MDDEV(mddev,tmp) {
1446 bitmap_print_sb(mddev->bitmap);
1448 printk("%s: ", mdname(mddev));
1449 ITERATE_RDEV(mddev,rdev,tmp2)
1450 printk("<%s>", bdevname(rdev->bdev,b));
1453 ITERATE_RDEV(mddev,rdev,tmp2)
1456 printk("md: **********************************\n");
1461 static void sync_sbs(mddev_t * mddev)
1464 struct list_head *tmp;
1466 ITERATE_RDEV(mddev,rdev,tmp) {
1467 super_types[mddev->major_version].
1468 sync_super(mddev, rdev);
1469 rdev->sb_loaded = 1;
1473 static void md_update_sb(mddev_t * mddev)
1476 struct list_head *tmp;
1481 spin_lock_irq(&mddev->write_lock);
1482 sync_req = mddev->in_sync;
1483 mddev->utime = get_seconds();
1486 if (!mddev->events) {
1488 * oops, this 64-bit counter should never wrap.
1489 * Either we are in around ~1 trillion A.C., assuming
1490 * 1 reboot per second, or we have a bug:
1495 mddev->sb_dirty = 2;
1499 * do not write anything to disk if using
1500 * nonpersistent superblocks
1502 if (!mddev->persistent) {
1503 mddev->sb_dirty = 0;
1504 spin_unlock_irq(&mddev->write_lock);
1505 wake_up(&mddev->sb_wait);
1508 spin_unlock_irq(&mddev->write_lock);
1511 "md: updating %s RAID superblock on device (in sync %d)\n",
1512 mdname(mddev),mddev->in_sync);
1514 err = bitmap_update_sb(mddev->bitmap);
1515 ITERATE_RDEV(mddev,rdev,tmp) {
1516 char b[BDEVNAME_SIZE];
1517 dprintk(KERN_INFO "md: ");
1518 if (test_bit(Faulty, &rdev->flags))
1519 dprintk("(skipping faulty ");
1521 dprintk("%s ", bdevname(rdev->bdev,b));
1522 if (!test_bit(Faulty, &rdev->flags)) {
1523 md_super_write(mddev,rdev,
1524 rdev->sb_offset<<1, rdev->sb_size,
1526 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1527 bdevname(rdev->bdev,b),
1528 (unsigned long long)rdev->sb_offset);
1532 if (mddev->level == LEVEL_MULTIPATH)
1533 /* only need to write one superblock... */
1536 md_super_wait(mddev);
1537 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1539 spin_lock_irq(&mddev->write_lock);
1540 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
1541 /* have to write it out again */
1542 spin_unlock_irq(&mddev->write_lock);
1545 mddev->sb_dirty = 0;
1546 spin_unlock_irq(&mddev->write_lock);
1547 wake_up(&mddev->sb_wait);
1551 /* words written to sysfs files may, or my not, be \n terminated.
1552 * We want to accept with case. For this we use cmd_match.
1554 static int cmd_match(const char *cmd, const char *str)
1556 /* See if cmd, written into a sysfs file, matches
1557 * str. They must either be the same, or cmd can
1558 * have a trailing newline
1560 while (*cmd && *str && *cmd == *str) {
1571 struct rdev_sysfs_entry {
1572 struct attribute attr;
1573 ssize_t (*show)(mdk_rdev_t *, char *);
1574 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1578 state_show(mdk_rdev_t *rdev, char *page)
1583 if (test_bit(Faulty, &rdev->flags)) {
1584 len+= sprintf(page+len, "%sfaulty",sep);
1587 if (test_bit(In_sync, &rdev->flags)) {
1588 len += sprintf(page+len, "%sin_sync",sep);
1591 if (!test_bit(Faulty, &rdev->flags) &&
1592 !test_bit(In_sync, &rdev->flags)) {
1593 len += sprintf(page+len, "%sspare", sep);
1596 return len+sprintf(page+len, "\n");
1599 static struct rdev_sysfs_entry
1600 rdev_state = __ATTR_RO(state);
1603 super_show(mdk_rdev_t *rdev, char *page)
1605 if (rdev->sb_loaded && rdev->sb_size) {
1606 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1607 return rdev->sb_size;
1611 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1614 errors_show(mdk_rdev_t *rdev, char *page)
1616 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1620 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1623 unsigned long n = simple_strtoul(buf, &e, 10);
1624 if (*buf && (*e == 0 || *e == '\n')) {
1625 atomic_set(&rdev->corrected_errors, n);
1630 static struct rdev_sysfs_entry rdev_errors =
1631 __ATTR(errors, 0644, errors_show, errors_store);
1634 slot_show(mdk_rdev_t *rdev, char *page)
1636 if (rdev->raid_disk < 0)
1637 return sprintf(page, "none\n");
1639 return sprintf(page, "%d\n", rdev->raid_disk);
1643 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1646 int slot = simple_strtoul(buf, &e, 10);
1647 if (strncmp(buf, "none", 4)==0)
1649 else if (e==buf || (*e && *e!= '\n'))
1651 if (rdev->mddev->pers)
1652 /* Cannot set slot in active array (yet) */
1654 if (slot >= rdev->mddev->raid_disks)
1656 rdev->raid_disk = slot;
1657 /* assume it is working */
1659 set_bit(In_sync, &rdev->flags);
1664 static struct rdev_sysfs_entry rdev_slot =
1665 __ATTR(slot, 0644, slot_show, slot_store);
1667 static struct attribute *rdev_default_attrs[] = {
1675 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1677 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1678 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1682 return entry->show(rdev, page);
1686 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1687 const char *page, size_t length)
1689 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1690 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1694 return entry->store(rdev, page, length);
1697 static void rdev_free(struct kobject *ko)
1699 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1702 static struct sysfs_ops rdev_sysfs_ops = {
1703 .show = rdev_attr_show,
1704 .store = rdev_attr_store,
1706 static struct kobj_type rdev_ktype = {
1707 .release = rdev_free,
1708 .sysfs_ops = &rdev_sysfs_ops,
1709 .default_attrs = rdev_default_attrs,
1713 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1715 * mark the device faulty if:
1717 * - the device is nonexistent (zero size)
1718 * - the device has no valid superblock
1720 * a faulty rdev _never_ has rdev->sb set.
1722 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1724 char b[BDEVNAME_SIZE];
1729 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1731 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1732 return ERR_PTR(-ENOMEM);
1735 if ((err = alloc_disk_sb(rdev)))
1738 err = lock_rdev(rdev, newdev);
1742 rdev->kobj.parent = NULL;
1743 rdev->kobj.ktype = &rdev_ktype;
1744 kobject_init(&rdev->kobj);
1748 rdev->data_offset = 0;
1749 atomic_set(&rdev->nr_pending, 0);
1750 atomic_set(&rdev->read_errors, 0);
1751 atomic_set(&rdev->corrected_errors, 0);
1753 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1756 "md: %s has zero or unknown size, marking faulty!\n",
1757 bdevname(rdev->bdev,b));
1762 if (super_format >= 0) {
1763 err = super_types[super_format].
1764 load_super(rdev, NULL, super_minor);
1765 if (err == -EINVAL) {
1767 "md: %s has invalid sb, not importing!\n",
1768 bdevname(rdev->bdev,b));
1773 "md: could not read %s's sb, not importing!\n",
1774 bdevname(rdev->bdev,b));
1778 INIT_LIST_HEAD(&rdev->same_set);
1783 if (rdev->sb_page) {
1789 return ERR_PTR(err);
1793 * Check a full RAID array for plausibility
1797 static void analyze_sbs(mddev_t * mddev)
1800 struct list_head *tmp;
1801 mdk_rdev_t *rdev, *freshest;
1802 char b[BDEVNAME_SIZE];
1805 ITERATE_RDEV(mddev,rdev,tmp)
1806 switch (super_types[mddev->major_version].
1807 load_super(rdev, freshest, mddev->minor_version)) {
1815 "md: fatal superblock inconsistency in %s"
1816 " -- removing from array\n",
1817 bdevname(rdev->bdev,b));
1818 kick_rdev_from_array(rdev);
1822 super_types[mddev->major_version].
1823 validate_super(mddev, freshest);
1826 ITERATE_RDEV(mddev,rdev,tmp) {
1827 if (rdev != freshest)
1828 if (super_types[mddev->major_version].
1829 validate_super(mddev, rdev)) {
1830 printk(KERN_WARNING "md: kicking non-fresh %s"
1832 bdevname(rdev->bdev,b));
1833 kick_rdev_from_array(rdev);
1836 if (mddev->level == LEVEL_MULTIPATH) {
1837 rdev->desc_nr = i++;
1838 rdev->raid_disk = rdev->desc_nr;
1839 set_bit(In_sync, &rdev->flags);
1845 if (mddev->recovery_cp != MaxSector &&
1847 printk(KERN_ERR "md: %s: raid array is not clean"
1848 " -- starting background reconstruction\n",
1854 level_show(mddev_t *mddev, char *page)
1856 struct mdk_personality *p = mddev->pers;
1858 return sprintf(page, "%s\n", p->name);
1859 else if (mddev->clevel[0])
1860 return sprintf(page, "%s\n", mddev->clevel);
1861 else if (mddev->level != LEVEL_NONE)
1862 return sprintf(page, "%d\n", mddev->level);
1868 level_store(mddev_t *mddev, const char *buf, size_t len)
1875 if (len >= sizeof(mddev->clevel))
1877 strncpy(mddev->clevel, buf, len);
1878 if (mddev->clevel[len-1] == '\n')
1880 mddev->clevel[len] = 0;
1881 mddev->level = LEVEL_NONE;
1885 static struct md_sysfs_entry md_level =
1886 __ATTR(level, 0644, level_show, level_store);
1889 raid_disks_show(mddev_t *mddev, char *page)
1891 if (mddev->raid_disks == 0)
1893 return sprintf(page, "%d\n", mddev->raid_disks);
1896 static int update_raid_disks(mddev_t *mddev, int raid_disks);
1899 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
1901 /* can only set raid_disks if array is not yet active */
1904 unsigned long n = simple_strtoul(buf, &e, 10);
1906 if (!*buf || (*e && *e != '\n'))
1910 rv = update_raid_disks(mddev, n);
1912 mddev->raid_disks = n;
1913 return rv ? rv : len;
1915 static struct md_sysfs_entry md_raid_disks =
1916 __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
1919 chunk_size_show(mddev_t *mddev, char *page)
1921 return sprintf(page, "%d\n", mddev->chunk_size);
1925 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
1927 /* can only set chunk_size if array is not yet active */
1929 unsigned long n = simple_strtoul(buf, &e, 10);
1933 if (!*buf || (*e && *e != '\n'))
1936 mddev->chunk_size = n;
1939 static struct md_sysfs_entry md_chunk_size =
1940 __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
1944 size_show(mddev_t *mddev, char *page)
1946 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
1949 static int update_size(mddev_t *mddev, unsigned long size);
1952 size_store(mddev_t *mddev, const char *buf, size_t len)
1954 /* If array is inactive, we can reduce the component size, but
1955 * not increase it (except from 0).
1956 * If array is active, we can try an on-line resize
1960 unsigned long long size = simple_strtoull(buf, &e, 10);
1961 if (!*buf || *buf == '\n' ||
1966 err = update_size(mddev, size);
1967 md_update_sb(mddev);
1969 if (mddev->size == 0 ||
1975 return err ? err : len;
1978 static struct md_sysfs_entry md_size =
1979 __ATTR(component_size, 0644, size_show, size_store);
1983 * This is either 'none' for arrays with externally managed metadata,
1984 * or N.M for internally known formats
1987 metadata_show(mddev_t *mddev, char *page)
1989 if (mddev->persistent)
1990 return sprintf(page, "%d.%d\n",
1991 mddev->major_version, mddev->minor_version);
1993 return sprintf(page, "none\n");
1997 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2001 if (!list_empty(&mddev->disks))
2004 if (cmd_match(buf, "none")) {
2005 mddev->persistent = 0;
2006 mddev->major_version = 0;
2007 mddev->minor_version = 90;
2010 major = simple_strtoul(buf, &e, 10);
2011 if (e==buf || *e != '.')
2014 minor = simple_strtoul(buf, &e, 10);
2015 if (e==buf || *e != '\n')
2017 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2018 super_types[major].name == NULL)
2020 mddev->major_version = major;
2021 mddev->minor_version = minor;
2022 mddev->persistent = 1;
2026 static struct md_sysfs_entry md_metadata =
2027 __ATTR(metadata_version, 0644, metadata_show, metadata_store);
2030 action_show(mddev_t *mddev, char *page)
2032 char *type = "idle";
2033 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2034 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2035 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2036 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2038 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2045 return sprintf(page, "%s\n", type);
2049 action_store(mddev_t *mddev, const char *page, size_t len)
2051 if (!mddev->pers || !mddev->pers->sync_request)
2054 if (cmd_match(page, "idle")) {
2055 if (mddev->sync_thread) {
2056 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2057 md_unregister_thread(mddev->sync_thread);
2058 mddev->sync_thread = NULL;
2059 mddev->recovery = 0;
2061 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2062 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2064 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2065 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2067 if (cmd_match(page, "check"))
2068 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2069 else if (cmd_match(page, "repair"))
2071 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2072 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2074 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2075 md_wakeup_thread(mddev->thread);
2080 mismatch_cnt_show(mddev_t *mddev, char *page)
2082 return sprintf(page, "%llu\n",
2083 (unsigned long long) mddev->resync_mismatches);
2086 static struct md_sysfs_entry
2087 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2090 static struct md_sysfs_entry
2091 md_mismatches = __ATTR_RO(mismatch_cnt);
2093 static struct attribute *md_default_attrs[] = {
2095 &md_raid_disks.attr,
2096 &md_chunk_size.attr,
2102 static struct attribute *md_redundancy_attrs[] = {
2104 &md_mismatches.attr,
2107 static struct attribute_group md_redundancy_group = {
2109 .attrs = md_redundancy_attrs,
2114 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2116 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2117 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2123 rv = entry->show(mddev, page);
2124 mddev_unlock(mddev);
2129 md_attr_store(struct kobject *kobj, struct attribute *attr,
2130 const char *page, size_t length)
2132 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2133 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2139 rv = entry->store(mddev, page, length);
2140 mddev_unlock(mddev);
2144 static void md_free(struct kobject *ko)
2146 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2150 static struct sysfs_ops md_sysfs_ops = {
2151 .show = md_attr_show,
2152 .store = md_attr_store,
2154 static struct kobj_type md_ktype = {
2156 .sysfs_ops = &md_sysfs_ops,
2157 .default_attrs = md_default_attrs,
2162 static struct kobject *md_probe(dev_t dev, int *part, void *data)
2164 static DECLARE_MUTEX(disks_sem);
2165 mddev_t *mddev = mddev_find(dev);
2166 struct gendisk *disk;
2167 int partitioned = (MAJOR(dev) != MD_MAJOR);
2168 int shift = partitioned ? MdpMinorShift : 0;
2169 int unit = MINOR(dev) >> shift;
2175 if (mddev->gendisk) {
2180 disk = alloc_disk(1 << shift);
2186 disk->major = MAJOR(dev);
2187 disk->first_minor = unit << shift;
2189 sprintf(disk->disk_name, "md_d%d", unit);
2190 sprintf(disk->devfs_name, "md/d%d", unit);
2192 sprintf(disk->disk_name, "md%d", unit);
2193 sprintf(disk->devfs_name, "md/%d", unit);
2195 disk->fops = &md_fops;
2196 disk->private_data = mddev;
2197 disk->queue = mddev->queue;
2199 mddev->gendisk = disk;
2201 mddev->kobj.parent = &disk->kobj;
2202 mddev->kobj.k_name = NULL;
2203 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2204 mddev->kobj.ktype = &md_ktype;
2205 kobject_register(&mddev->kobj);
2209 void md_wakeup_thread(mdk_thread_t *thread);
2211 static void md_safemode_timeout(unsigned long data)
2213 mddev_t *mddev = (mddev_t *) data;
2215 mddev->safemode = 1;
2216 md_wakeup_thread(mddev->thread);
2219 static int start_dirty_degraded;
2221 static int do_md_run(mddev_t * mddev)
2225 struct list_head *tmp;
2227 struct gendisk *disk;
2228 struct mdk_personality *pers;
2229 char b[BDEVNAME_SIZE];
2231 if (list_empty(&mddev->disks))
2232 /* cannot run an array with no devices.. */
2239 * Analyze all RAID superblock(s)
2241 if (!mddev->raid_disks)
2244 chunk_size = mddev->chunk_size;
2247 if (chunk_size > MAX_CHUNK_SIZE) {
2248 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2249 chunk_size, MAX_CHUNK_SIZE);
2253 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2255 if ( (1 << ffz(~chunk_size)) != chunk_size) {
2256 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
2259 if (chunk_size < PAGE_SIZE) {
2260 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2261 chunk_size, PAGE_SIZE);
2265 /* devices must have minimum size of one chunk */
2266 ITERATE_RDEV(mddev,rdev,tmp) {
2267 if (test_bit(Faulty, &rdev->flags))
2269 if (rdev->size < chunk_size / 1024) {
2271 "md: Dev %s smaller than chunk_size:"
2273 bdevname(rdev->bdev,b),
2274 (unsigned long long)rdev->size,
2282 if (mddev->level != LEVEL_NONE)
2283 request_module("md-level-%d", mddev->level);
2284 else if (mddev->clevel[0])
2285 request_module("md-%s", mddev->clevel);
2289 * Drop all container device buffers, from now on
2290 * the only valid external interface is through the md
2292 * Also find largest hardsector size
2294 ITERATE_RDEV(mddev,rdev,tmp) {
2295 if (test_bit(Faulty, &rdev->flags))
2297 sync_blockdev(rdev->bdev);
2298 invalidate_bdev(rdev->bdev, 0);
2301 md_probe(mddev->unit, NULL, NULL);
2302 disk = mddev->gendisk;
2306 spin_lock(&pers_lock);
2307 pers = find_pers(mddev->level, mddev->clevel);
2308 if (!pers || !try_module_get(pers->owner)) {
2309 spin_unlock(&pers_lock);
2310 if (mddev->level != LEVEL_NONE)
2311 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2314 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2319 spin_unlock(&pers_lock);
2320 mddev->level = pers->level;
2321 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2323 mddev->recovery = 0;
2324 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
2325 mddev->barriers_work = 1;
2326 mddev->ok_start_degraded = start_dirty_degraded;
2329 mddev->ro = 2; /* read-only, but switch on first write */
2331 err = mddev->pers->run(mddev);
2332 if (!err && mddev->pers->sync_request) {
2333 err = bitmap_create(mddev);
2335 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2336 mdname(mddev), err);
2337 mddev->pers->stop(mddev);
2341 printk(KERN_ERR "md: pers->run() failed ...\n");
2342 module_put(mddev->pers->owner);
2344 bitmap_destroy(mddev);
2347 if (mddev->pers->sync_request)
2348 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
2349 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2352 atomic_set(&mddev->writes_pending,0);
2353 mddev->safemode = 0;
2354 mddev->safemode_timer.function = md_safemode_timeout;
2355 mddev->safemode_timer.data = (unsigned long) mddev;
2356 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2359 ITERATE_RDEV(mddev,rdev,tmp)
2360 if (rdev->raid_disk >= 0) {
2362 sprintf(nm, "rd%d", rdev->raid_disk);
2363 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2366 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2367 md_wakeup_thread(mddev->thread);
2369 if (mddev->sb_dirty)
2370 md_update_sb(mddev);
2372 set_capacity(disk, mddev->array_size<<1);
2374 /* If we call blk_queue_make_request here, it will
2375 * re-initialise max_sectors etc which may have been
2376 * refined inside -> run. So just set the bits we need to set.
2377 * Most initialisation happended when we called
2378 * blk_queue_make_request(..., md_fail_request)
2381 mddev->queue->queuedata = mddev;
2382 mddev->queue->make_request_fn = mddev->pers->make_request;
2385 md_new_event(mddev);
2389 static int restart_array(mddev_t *mddev)
2391 struct gendisk *disk = mddev->gendisk;
2395 * Complain if it has no devices
2398 if (list_empty(&mddev->disks))
2406 mddev->safemode = 0;
2408 set_disk_ro(disk, 0);
2410 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2413 * Kick recovery or resync if necessary
2415 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2416 md_wakeup_thread(mddev->thread);
2419 printk(KERN_ERR "md: %s has no personality assigned.\n",
2428 static int do_md_stop(mddev_t * mddev, int ro)
2431 struct gendisk *disk = mddev->gendisk;
2434 if (atomic_read(&mddev->active)>2) {
2435 printk("md: %s still in use.\n",mdname(mddev));
2439 if (mddev->sync_thread) {
2440 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2441 md_unregister_thread(mddev->sync_thread);
2442 mddev->sync_thread = NULL;
2445 del_timer_sync(&mddev->safemode_timer);
2447 invalidate_partition(disk, 0);
2455 bitmap_flush(mddev);
2456 md_super_wait(mddev);
2458 set_disk_ro(disk, 0);
2459 blk_queue_make_request(mddev->queue, md_fail_request);
2460 mddev->pers->stop(mddev);
2461 if (mddev->pers->sync_request)
2462 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2464 module_put(mddev->pers->owner);
2469 if (!mddev->in_sync) {
2470 /* mark array as shutdown cleanly */
2472 md_update_sb(mddev);
2475 set_disk_ro(disk, 1);
2478 bitmap_destroy(mddev);
2479 if (mddev->bitmap_file) {
2480 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2481 fput(mddev->bitmap_file);
2482 mddev->bitmap_file = NULL;
2484 mddev->bitmap_offset = 0;
2487 * Free resources if final stop
2491 struct list_head *tmp;
2492 struct gendisk *disk;
2493 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2495 ITERATE_RDEV(mddev,rdev,tmp)
2496 if (rdev->raid_disk >= 0) {
2498 sprintf(nm, "rd%d", rdev->raid_disk);
2499 sysfs_remove_link(&mddev->kobj, nm);
2502 export_array(mddev);
2504 mddev->array_size = 0;
2505 disk = mddev->gendisk;
2507 set_capacity(disk, 0);
2510 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2513 md_new_event(mddev);
2518 static void autorun_array(mddev_t *mddev)
2521 struct list_head *tmp;
2524 if (list_empty(&mddev->disks))
2527 printk(KERN_INFO "md: running: ");
2529 ITERATE_RDEV(mddev,rdev,tmp) {
2530 char b[BDEVNAME_SIZE];
2531 printk("<%s>", bdevname(rdev->bdev,b));
2535 err = do_md_run (mddev);
2537 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2538 do_md_stop (mddev, 0);
2543 * lets try to run arrays based on all disks that have arrived
2544 * until now. (those are in pending_raid_disks)
2546 * the method: pick the first pending disk, collect all disks with
2547 * the same UUID, remove all from the pending list and put them into
2548 * the 'same_array' list. Then order this list based on superblock
2549 * update time (freshest comes first), kick out 'old' disks and
2550 * compare superblocks. If everything's fine then run it.
2552 * If "unit" is allocated, then bump its reference count
2554 static void autorun_devices(int part)
2556 struct list_head candidates;
2557 struct list_head *tmp;
2558 mdk_rdev_t *rdev0, *rdev;
2560 char b[BDEVNAME_SIZE];
2562 printk(KERN_INFO "md: autorun ...\n");
2563 while (!list_empty(&pending_raid_disks)) {
2565 rdev0 = list_entry(pending_raid_disks.next,
2566 mdk_rdev_t, same_set);
2568 printk(KERN_INFO "md: considering %s ...\n",
2569 bdevname(rdev0->bdev,b));
2570 INIT_LIST_HEAD(&candidates);
2571 ITERATE_RDEV_PENDING(rdev,tmp)
2572 if (super_90_load(rdev, rdev0, 0) >= 0) {
2573 printk(KERN_INFO "md: adding %s ...\n",
2574 bdevname(rdev->bdev,b));
2575 list_move(&rdev->same_set, &candidates);
2578 * now we have a set of devices, with all of them having
2579 * mostly sane superblocks. It's time to allocate the
2582 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2583 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2584 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2588 dev = MKDEV(mdp_major,
2589 rdev0->preferred_minor << MdpMinorShift);
2591 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2593 md_probe(dev, NULL, NULL);
2594 mddev = mddev_find(dev);
2597 "md: cannot allocate memory for md drive.\n");
2600 if (mddev_lock(mddev))
2601 printk(KERN_WARNING "md: %s locked, cannot run\n",
2603 else if (mddev->raid_disks || mddev->major_version
2604 || !list_empty(&mddev->disks)) {
2606 "md: %s already running, cannot run %s\n",
2607 mdname(mddev), bdevname(rdev0->bdev,b));
2608 mddev_unlock(mddev);
2610 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2611 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2612 list_del_init(&rdev->same_set);
2613 if (bind_rdev_to_array(rdev, mddev))
2616 autorun_array(mddev);
2617 mddev_unlock(mddev);
2619 /* on success, candidates will be empty, on error
2622 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2626 printk(KERN_INFO "md: ... autorun DONE.\n");
2630 * import RAID devices based on one partition
2631 * if possible, the array gets run as well.
2634 static int autostart_array(dev_t startdev)
2636 char b[BDEVNAME_SIZE];
2637 int err = -EINVAL, i;
2638 mdp_super_t *sb = NULL;
2639 mdk_rdev_t *start_rdev = NULL, *rdev;
2641 start_rdev = md_import_device(startdev, 0, 0);
2642 if (IS_ERR(start_rdev))
2646 /* NOTE: this can only work for 0.90.0 superblocks */
2647 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2648 if (sb->major_version != 0 ||
2649 sb->minor_version != 90 ) {
2650 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2651 export_rdev(start_rdev);
2655 if (test_bit(Faulty, &start_rdev->flags)) {
2657 "md: can not autostart based on faulty %s!\n",
2658 bdevname(start_rdev->bdev,b));
2659 export_rdev(start_rdev);
2662 list_add(&start_rdev->same_set, &pending_raid_disks);
2664 for (i = 0; i < MD_SB_DISKS; i++) {
2665 mdp_disk_t *desc = sb->disks + i;
2666 dev_t dev = MKDEV(desc->major, desc->minor);
2670 if (dev == startdev)
2672 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2674 rdev = md_import_device(dev, 0, 0);
2678 list_add(&rdev->same_set, &pending_raid_disks);
2682 * possibly return codes
2690 static int get_version(void __user * arg)
2694 ver.major = MD_MAJOR_VERSION;
2695 ver.minor = MD_MINOR_VERSION;
2696 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2698 if (copy_to_user(arg, &ver, sizeof(ver)))
2704 static int get_array_info(mddev_t * mddev, void __user * arg)
2706 mdu_array_info_t info;
2707 int nr,working,active,failed,spare;
2709 struct list_head *tmp;
2711 nr=working=active=failed=spare=0;
2712 ITERATE_RDEV(mddev,rdev,tmp) {
2714 if (test_bit(Faulty, &rdev->flags))
2718 if (test_bit(In_sync, &rdev->flags))
2725 info.major_version = mddev->major_version;
2726 info.minor_version = mddev->minor_version;
2727 info.patch_version = MD_PATCHLEVEL_VERSION;
2728 info.ctime = mddev->ctime;
2729 info.level = mddev->level;
2730 info.size = mddev->size;
2732 info.raid_disks = mddev->raid_disks;
2733 info.md_minor = mddev->md_minor;
2734 info.not_persistent= !mddev->persistent;
2736 info.utime = mddev->utime;
2739 info.state = (1<<MD_SB_CLEAN);
2740 if (mddev->bitmap && mddev->bitmap_offset)
2741 info.state = (1<<MD_SB_BITMAP_PRESENT);
2742 info.active_disks = active;
2743 info.working_disks = working;
2744 info.failed_disks = failed;
2745 info.spare_disks = spare;
2747 info.layout = mddev->layout;
2748 info.chunk_size = mddev->chunk_size;
2750 if (copy_to_user(arg, &info, sizeof(info)))
2756 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
2758 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2759 char *ptr, *buf = NULL;
2762 file = kmalloc(sizeof(*file), GFP_KERNEL);
2766 /* bitmap disabled, zero the first byte and copy out */
2767 if (!mddev->bitmap || !mddev->bitmap->file) {
2768 file->pathname[0] = '\0';
2772 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
2776 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
2780 strcpy(file->pathname, ptr);
2784 if (copy_to_user(arg, file, sizeof(*file)))
2792 static int get_disk_info(mddev_t * mddev, void __user * arg)
2794 mdu_disk_info_t info;
2798 if (copy_from_user(&info, arg, sizeof(info)))
2803 rdev = find_rdev_nr(mddev, nr);
2805 info.major = MAJOR(rdev->bdev->bd_dev);
2806 info.minor = MINOR(rdev->bdev->bd_dev);
2807 info.raid_disk = rdev->raid_disk;
2809 if (test_bit(Faulty, &rdev->flags))
2810 info.state |= (1<<MD_DISK_FAULTY);
2811 else if (test_bit(In_sync, &rdev->flags)) {
2812 info.state |= (1<<MD_DISK_ACTIVE);
2813 info.state |= (1<<MD_DISK_SYNC);
2815 if (test_bit(WriteMostly, &rdev->flags))
2816 info.state |= (1<<MD_DISK_WRITEMOSTLY);
2818 info.major = info.minor = 0;
2819 info.raid_disk = -1;
2820 info.state = (1<<MD_DISK_REMOVED);
2823 if (copy_to_user(arg, &info, sizeof(info)))
2829 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
2831 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
2833 dev_t dev = MKDEV(info->major,info->minor);
2835 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
2838 if (!mddev->raid_disks) {
2840 /* expecting a device which has a superblock */
2841 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
2844 "md: md_import_device returned %ld\n",
2846 return PTR_ERR(rdev);
2848 if (!list_empty(&mddev->disks)) {
2849 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2850 mdk_rdev_t, same_set);
2851 int err = super_types[mddev->major_version]
2852 .load_super(rdev, rdev0, mddev->minor_version);
2855 "md: %s has different UUID to %s\n",
2856 bdevname(rdev->bdev,b),
2857 bdevname(rdev0->bdev,b2));
2862 err = bind_rdev_to_array(rdev, mddev);
2869 * add_new_disk can be used once the array is assembled
2870 * to add "hot spares". They must already have a superblock
2875 if (!mddev->pers->hot_add_disk) {
2877 "%s: personality does not support diskops!\n",
2881 if (mddev->persistent)
2882 rdev = md_import_device(dev, mddev->major_version,
2883 mddev->minor_version);
2885 rdev = md_import_device(dev, -1, -1);
2888 "md: md_import_device returned %ld\n",
2890 return PTR_ERR(rdev);
2892 /* set save_raid_disk if appropriate */
2893 if (!mddev->persistent) {
2894 if (info->state & (1<<MD_DISK_SYNC) &&
2895 info->raid_disk < mddev->raid_disks)
2896 rdev->raid_disk = info->raid_disk;
2898 rdev->raid_disk = -1;
2900 super_types[mddev->major_version].
2901 validate_super(mddev, rdev);
2902 rdev->saved_raid_disk = rdev->raid_disk;
2904 clear_bit(In_sync, &rdev->flags); /* just to be sure */
2905 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2906 set_bit(WriteMostly, &rdev->flags);
2908 rdev->raid_disk = -1;
2909 err = bind_rdev_to_array(rdev, mddev);
2913 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2914 md_wakeup_thread(mddev->thread);
2918 /* otherwise, add_new_disk is only allowed
2919 * for major_version==0 superblocks
2921 if (mddev->major_version != 0) {
2922 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
2927 if (!(info->state & (1<<MD_DISK_FAULTY))) {
2929 rdev = md_import_device (dev, -1, 0);
2932 "md: error, md_import_device() returned %ld\n",
2934 return PTR_ERR(rdev);
2936 rdev->desc_nr = info->number;
2937 if (info->raid_disk < mddev->raid_disks)
2938 rdev->raid_disk = info->raid_disk;
2940 rdev->raid_disk = -1;
2944 if (rdev->raid_disk < mddev->raid_disks)
2945 if (info->state & (1<<MD_DISK_SYNC))
2946 set_bit(In_sync, &rdev->flags);
2948 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
2949 set_bit(WriteMostly, &rdev->flags);
2951 if (!mddev->persistent) {
2952 printk(KERN_INFO "md: nonpersistent superblock ...\n");
2953 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2955 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
2956 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
2958 err = bind_rdev_to_array(rdev, mddev);
2968 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
2970 char b[BDEVNAME_SIZE];
2976 rdev = find_rdev(mddev, dev);
2980 if (rdev->raid_disk >= 0)
2983 kick_rdev_from_array(rdev);
2984 md_update_sb(mddev);
2985 md_new_event(mddev);
2989 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
2990 bdevname(rdev->bdev,b), mdname(mddev));
2994 static int hot_add_disk(mddev_t * mddev, dev_t dev)
2996 char b[BDEVNAME_SIZE];
3004 if (mddev->major_version != 0) {
3005 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3006 " version-0 superblocks.\n",
3010 if (!mddev->pers->hot_add_disk) {
3012 "%s: personality does not support diskops!\n",
3017 rdev = md_import_device (dev, -1, 0);
3020 "md: error, md_import_device() returned %ld\n",
3025 if (mddev->persistent)
3026 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3029 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3031 size = calc_dev_size(rdev, mddev->chunk_size);
3034 if (test_bit(Faulty, &rdev->flags)) {
3036 "md: can not hot-add faulty %s disk to %s!\n",
3037 bdevname(rdev->bdev,b), mdname(mddev));
3041 clear_bit(In_sync, &rdev->flags);
3043 err = bind_rdev_to_array(rdev, mddev);
3048 * The rest should better be atomic, we can have disk failures
3049 * noticed in interrupt contexts ...
3052 if (rdev->desc_nr == mddev->max_disks) {
3053 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3056 goto abort_unbind_export;
3059 rdev->raid_disk = -1;
3061 md_update_sb(mddev);
3064 * Kick recovery, maybe this spare has to be added to the
3065 * array immediately.
3067 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3068 md_wakeup_thread(mddev->thread);
3069 md_new_event(mddev);
3072 abort_unbind_export:
3073 unbind_rdev_from_array(rdev);
3080 /* similar to deny_write_access, but accounts for our holding a reference
3081 * to the file ourselves */
3082 static int deny_bitmap_write_access(struct file * file)
3084 struct inode *inode = file->f_mapping->host;
3086 spin_lock(&inode->i_lock);
3087 if (atomic_read(&inode->i_writecount) > 1) {
3088 spin_unlock(&inode->i_lock);
3091 atomic_set(&inode->i_writecount, -1);
3092 spin_unlock(&inode->i_lock);
3097 static int set_bitmap_file(mddev_t *mddev, int fd)
3102 if (!mddev->pers->quiesce)
3104 if (mddev->recovery || mddev->sync_thread)
3106 /* we should be able to change the bitmap.. */
3112 return -EEXIST; /* cannot add when bitmap is present */
3113 mddev->bitmap_file = fget(fd);
3115 if (mddev->bitmap_file == NULL) {
3116 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3121 err = deny_bitmap_write_access(mddev->bitmap_file);
3123 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3125 fput(mddev->bitmap_file);
3126 mddev->bitmap_file = NULL;
3129 mddev->bitmap_offset = 0; /* file overrides offset */
3130 } else if (mddev->bitmap == NULL)
3131 return -ENOENT; /* cannot remove what isn't there */
3134 mddev->pers->quiesce(mddev, 1);
3136 err = bitmap_create(mddev);
3138 bitmap_destroy(mddev);
3139 mddev->pers->quiesce(mddev, 0);
3140 } else if (fd < 0) {
3141 if (mddev->bitmap_file)
3142 fput(mddev->bitmap_file);
3143 mddev->bitmap_file = NULL;
3150 * set_array_info is used two different ways
3151 * The original usage is when creating a new array.
3152 * In this usage, raid_disks is > 0 and it together with
3153 * level, size, not_persistent,layout,chunksize determine the
3154 * shape of the array.
3155 * This will always create an array with a type-0.90.0 superblock.
3156 * The newer usage is when assembling an array.
3157 * In this case raid_disks will be 0, and the major_version field is
3158 * use to determine which style super-blocks are to be found on the devices.
3159 * The minor and patch _version numbers are also kept incase the
3160 * super_block handler wishes to interpret them.
3162 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3165 if (info->raid_disks == 0) {
3166 /* just setting version number for superblock loading */
3167 if (info->major_version < 0 ||
3168 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3169 super_types[info->major_version].name == NULL) {
3170 /* maybe try to auto-load a module? */
3172 "md: superblock version %d not known\n",
3173 info->major_version);
3176 mddev->major_version = info->major_version;
3177 mddev->minor_version = info->minor_version;
3178 mddev->patch_version = info->patch_version;
3181 mddev->major_version = MD_MAJOR_VERSION;
3182 mddev->minor_version = MD_MINOR_VERSION;
3183 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3184 mddev->ctime = get_seconds();
3186 mddev->level = info->level;
3187 mddev->size = info->size;
3188 mddev->raid_disks = info->raid_disks;
3189 /* don't set md_minor, it is determined by which /dev/md* was
3192 if (info->state & (1<<MD_SB_CLEAN))
3193 mddev->recovery_cp = MaxSector;
3195 mddev->recovery_cp = 0;
3196 mddev->persistent = ! info->not_persistent;
3198 mddev->layout = info->layout;
3199 mddev->chunk_size = info->chunk_size;
3201 mddev->max_disks = MD_SB_DISKS;
3203 mddev->sb_dirty = 1;
3205 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3206 mddev->bitmap_offset = 0;
3209 * Generate a 128 bit UUID
3211 get_random_bytes(mddev->uuid, 16);
3216 static int update_size(mddev_t *mddev, unsigned long size)
3220 struct list_head *tmp;
3222 if (mddev->pers->resize == NULL)
3224 /* The "size" is the amount of each device that is used.
3225 * This can only make sense for arrays with redundancy.
3226 * linear and raid0 always use whatever space is available
3227 * We can only consider changing the size if no resync
3228 * or reconstruction is happening, and if the new size
3229 * is acceptable. It must fit before the sb_offset or,
3230 * if that is <data_offset, it must fit before the
3231 * size of each device.
3232 * If size is zero, we find the largest size that fits.
3234 if (mddev->sync_thread)
3236 ITERATE_RDEV(mddev,rdev,tmp) {
3238 int fit = (size == 0);
3239 if (rdev->sb_offset > rdev->data_offset)
3240 avail = (rdev->sb_offset*2) - rdev->data_offset;
3242 avail = get_capacity(rdev->bdev->bd_disk)
3243 - rdev->data_offset;
3244 if (fit && (size == 0 || size > avail/2))
3246 if (avail < ((sector_t)size << 1))
3249 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3251 struct block_device *bdev;
3253 bdev = bdget_disk(mddev->gendisk, 0);
3255 down(&bdev->bd_inode->i_sem);
3256 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3257 up(&bdev->bd_inode->i_sem);
3264 static int update_raid_disks(mddev_t *mddev, int raid_disks)
3267 /* change the number of raid disks */
3268 if (mddev->pers->reshape == NULL)
3270 if (raid_disks <= 0 ||
3271 raid_disks >= mddev->max_disks)
3273 if (mddev->sync_thread)
3275 rv = mddev->pers->reshape(mddev, raid_disks);
3277 struct block_device *bdev;
3279 bdev = bdget_disk(mddev->gendisk, 0);
3281 down(&bdev->bd_inode->i_sem);
3282 i_size_write(bdev->bd_inode, mddev->array_size << 10);
3283 up(&bdev->bd_inode->i_sem);
3292 * update_array_info is used to change the configuration of an
3294 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3295 * fields in the info are checked against the array.
3296 * Any differences that cannot be handled will cause an error.
3297 * Normally, only one change can be managed at a time.
3299 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3305 /* calculate expected state,ignoring low bits */
3306 if (mddev->bitmap && mddev->bitmap_offset)
3307 state |= (1 << MD_SB_BITMAP_PRESENT);
3309 if (mddev->major_version != info->major_version ||
3310 mddev->minor_version != info->minor_version ||
3311 /* mddev->patch_version != info->patch_version || */
3312 mddev->ctime != info->ctime ||
3313 mddev->level != info->level ||
3314 /* mddev->layout != info->layout || */
3315 !mddev->persistent != info->not_persistent||
3316 mddev->chunk_size != info->chunk_size ||
3317 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3318 ((state^info->state) & 0xfffffe00)
3321 /* Check there is only one change */
3322 if (mddev->size != info->size) cnt++;
3323 if (mddev->raid_disks != info->raid_disks) cnt++;
3324 if (mddev->layout != info->layout) cnt++;
3325 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
3326 if (cnt == 0) return 0;
3327 if (cnt > 1) return -EINVAL;
3329 if (mddev->layout != info->layout) {
3331 * we don't need to do anything at the md level, the
3332 * personality will take care of it all.
3334 if (mddev->pers->reconfig == NULL)
3337 return mddev->pers->reconfig(mddev, info->layout, -1);
3339 if (mddev->size != info->size)
3340 rv = update_size(mddev, info->size);
3342 if (mddev->raid_disks != info->raid_disks)
3343 rv = update_raid_disks(mddev, info->raid_disks);
3345 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3346 if (mddev->pers->quiesce == NULL)
3348 if (mddev->recovery || mddev->sync_thread)
3350 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3351 /* add the bitmap */
3354 if (mddev->default_bitmap_offset == 0)
3356 mddev->bitmap_offset = mddev->default_bitmap_offset;
3357 mddev->pers->quiesce(mddev, 1);
3358 rv = bitmap_create(mddev);
3360 bitmap_destroy(mddev);
3361 mddev->pers->quiesce(mddev, 0);
3363 /* remove the bitmap */
3366 if (mddev->bitmap->file)
3368 mddev->pers->quiesce(mddev, 1);
3369 bitmap_destroy(mddev);
3370 mddev->pers->quiesce(mddev, 0);
3371 mddev->bitmap_offset = 0;
3374 md_update_sb(mddev);
3378 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3382 if (mddev->pers == NULL)
3385 rdev = find_rdev(mddev, dev);
3389 md_error(mddev, rdev);
3393 static int md_ioctl(struct inode *inode, struct file *file,
3394 unsigned int cmd, unsigned long arg)
3397 void __user *argp = (void __user *)arg;
3398 struct hd_geometry __user *loc = argp;
3399 mddev_t *mddev = NULL;
3401 if (!capable(CAP_SYS_ADMIN))
3405 * Commands dealing with the RAID driver but not any
3411 err = get_version(argp);
3414 case PRINT_RAID_DEBUG:
3422 autostart_arrays(arg);
3429 * Commands creating/starting a new array:
3432 mddev = inode->i_bdev->bd_disk->private_data;
3440 if (cmd == START_ARRAY) {
3441 /* START_ARRAY doesn't need to lock the array as autostart_array
3442 * does the locking, and it could even be a different array
3447 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3448 "This will not be supported beyond July 2006\n",
3449 current->comm, current->pid);
3452 err = autostart_array(new_decode_dev(arg));
3454 printk(KERN_WARNING "md: autostart failed!\n");
3460 err = mddev_lock(mddev);
3463 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3470 case SET_ARRAY_INFO:
3472 mdu_array_info_t info;
3474 memset(&info, 0, sizeof(info));
3475 else if (copy_from_user(&info, argp, sizeof(info))) {
3480 err = update_array_info(mddev, &info);
3482 printk(KERN_WARNING "md: couldn't update"
3483 " array info. %d\n", err);
3488 if (!list_empty(&mddev->disks)) {
3490 "md: array %s already has disks!\n",
3495 if (mddev->raid_disks) {
3497 "md: array %s already initialised!\n",
3502 err = set_array_info(mddev, &info);
3504 printk(KERN_WARNING "md: couldn't set"
3505 " array info. %d\n", err);
3515 * Commands querying/configuring an existing array:
3517 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3518 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3519 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3520 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
3526 * Commands even a read-only array can execute:
3530 case GET_ARRAY_INFO:
3531 err = get_array_info(mddev, argp);
3534 case GET_BITMAP_FILE:
3535 err = get_bitmap_file(mddev, argp);
3539 err = get_disk_info(mddev, argp);
3542 case RESTART_ARRAY_RW:
3543 err = restart_array(mddev);
3547 err = do_md_stop (mddev, 0);
3551 err = do_md_stop (mddev, 1);
3555 * We have a problem here : there is no easy way to give a CHS
3556 * virtual geometry. We currently pretend that we have a 2 heads
3557 * 4 sectors (with a BIG number of cylinders...). This drives
3558 * dosfs just mad... ;-)
3565 err = put_user (2, (char __user *) &loc->heads);
3568 err = put_user (4, (char __user *) &loc->sectors);
3571 err = put_user(get_capacity(mddev->gendisk)/8,
3572 (short __user *) &loc->cylinders);
3575 err = put_user (get_start_sect(inode->i_bdev),
3576 (long __user *) &loc->start);
3581 * The remaining ioctls are changing the state of the
3582 * superblock, so we do not allow them on read-only arrays.
3583 * However non-MD ioctls (e.g. get-size) will still come through
3584 * here and hit the 'default' below, so only disallow
3585 * 'md' ioctls, and switch to rw mode if started auto-readonly.
3587 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3588 mddev->ro && mddev->pers) {
3589 if (mddev->ro == 2) {
3591 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3592 md_wakeup_thread(mddev->thread);
3604 mdu_disk_info_t info;
3605 if (copy_from_user(&info, argp, sizeof(info)))
3608 err = add_new_disk(mddev, &info);
3612 case HOT_REMOVE_DISK:
3613 err = hot_remove_disk(mddev, new_decode_dev(arg));
3617 err = hot_add_disk(mddev, new_decode_dev(arg));
3620 case SET_DISK_FAULTY:
3621 err = set_disk_faulty(mddev, new_decode_dev(arg));
3625 err = do_md_run (mddev);
3628 case SET_BITMAP_FILE:
3629 err = set_bitmap_file(mddev, (int)arg);
3633 if (_IOC_TYPE(cmd) == MD_MAJOR)
3634 printk(KERN_WARNING "md: %s(pid %d) used"
3635 " obsolete MD ioctl, upgrade your"
3636 " software to use new ictls.\n",
3637 current->comm, current->pid);
3644 mddev_unlock(mddev);
3654 static int md_open(struct inode *inode, struct file *file)
3657 * Succeed if we can lock the mddev, which confirms that
3658 * it isn't being stopped right now.
3660 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3663 if ((err = mddev_lock(mddev)))
3668 mddev_unlock(mddev);
3670 check_disk_change(inode->i_bdev);
3675 static int md_release(struct inode *inode, struct file * file)
3677 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3686 static int md_media_changed(struct gendisk *disk)
3688 mddev_t *mddev = disk->private_data;
3690 return mddev->changed;
3693 static int md_revalidate(struct gendisk *disk)
3695 mddev_t *mddev = disk->private_data;
3700 static struct block_device_operations md_fops =
3702 .owner = THIS_MODULE,
3704 .release = md_release,
3706 .media_changed = md_media_changed,
3707 .revalidate_disk= md_revalidate,
3710 static int md_thread(void * arg)
3712 mdk_thread_t *thread = arg;
3715 * md_thread is a 'system-thread', it's priority should be very
3716 * high. We avoid resource deadlocks individually in each
3717 * raid personality. (RAID5 does preallocation) We also use RR and
3718 * the very same RT priority as kswapd, thus we will never get
3719 * into a priority inversion deadlock.
3721 * we definitely have to have equal or higher priority than
3722 * bdflush, otherwise bdflush will deadlock if there are too
3723 * many dirty RAID5 blocks.
3726 allow_signal(SIGKILL);
3727 while (!kthread_should_stop()) {
3729 /* We need to wait INTERRUPTIBLE so that
3730 * we don't add to the load-average.
3731 * That means we need to be sure no signals are
3734 if (signal_pending(current))
3735 flush_signals(current);
3737 wait_event_interruptible_timeout
3739 test_bit(THREAD_WAKEUP, &thread->flags)
3740 || kthread_should_stop(),
3744 clear_bit(THREAD_WAKEUP, &thread->flags);
3746 thread->run(thread->mddev);
3752 void md_wakeup_thread(mdk_thread_t *thread)
3755 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3756 set_bit(THREAD_WAKEUP, &thread->flags);
3757 wake_up(&thread->wqueue);
3761 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3764 mdk_thread_t *thread;
3766 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
3770 init_waitqueue_head(&thread->wqueue);
3773 thread->mddev = mddev;
3774 thread->timeout = MAX_SCHEDULE_TIMEOUT;
3775 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
3776 if (IS_ERR(thread->tsk)) {
3783 void md_unregister_thread(mdk_thread_t *thread)
3785 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
3787 kthread_stop(thread->tsk);
3791 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
3798 if (!rdev || test_bit(Faulty, &rdev->flags))
3801 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
3803 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
3804 __builtin_return_address(0),__builtin_return_address(1),
3805 __builtin_return_address(2),__builtin_return_address(3));
3807 if (!mddev->pers->error_handler)
3809 mddev->pers->error_handler(mddev,rdev);
3810 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3811 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3812 md_wakeup_thread(mddev->thread);
3813 md_new_event(mddev);
3816 /* seq_file implementation /proc/mdstat */
3818 static void status_unused(struct seq_file *seq)
3822 struct list_head *tmp;
3824 seq_printf(seq, "unused devices: ");
3826 ITERATE_RDEV_PENDING(rdev,tmp) {
3827 char b[BDEVNAME_SIZE];
3829 seq_printf(seq, "%s ",
3830 bdevname(rdev->bdev,b));
3833 seq_printf(seq, "<none>");
3835 seq_printf(seq, "\n");
3839 static void status_resync(struct seq_file *seq, mddev_t * mddev)
3841 unsigned long max_blocks, resync, res, dt, db, rt;
3843 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
3845 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3846 max_blocks = mddev->resync_max_sectors >> 1;
3848 max_blocks = mddev->size;
3851 * Should not happen.
3857 res = (resync/1024)*1000/(max_blocks/1024 + 1);
3859 int i, x = res/50, y = 20-x;
3860 seq_printf(seq, "[");
3861 for (i = 0; i < x; i++)
3862 seq_printf(seq, "=");
3863 seq_printf(seq, ">");
3864 for (i = 0; i < y; i++)
3865 seq_printf(seq, ".");
3866 seq_printf(seq, "] ");
3868 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
3869 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
3870 "resync" : "recovery"),
3871 res/10, res % 10, resync, max_blocks);
3874 * We do not want to overflow, so the order of operands and
3875 * the * 100 / 100 trick are important. We do a +1 to be
3876 * safe against division by zero. We only estimate anyway.
3878 * dt: time from mark until now
3879 * db: blocks written from mark until now
3880 * rt: remaining time
3882 dt = ((jiffies - mddev->resync_mark) / HZ);
3884 db = resync - (mddev->resync_mark_cnt/2);
3885 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
3887 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
3889 seq_printf(seq, " speed=%ldK/sec", db/dt);
3892 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
3894 struct list_head *tmp;
3904 spin_lock(&all_mddevs_lock);
3905 list_for_each(tmp,&all_mddevs)
3907 mddev = list_entry(tmp, mddev_t, all_mddevs);
3909 spin_unlock(&all_mddevs_lock);
3912 spin_unlock(&all_mddevs_lock);
3914 return (void*)2;/* tail */
3918 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
3920 struct list_head *tmp;
3921 mddev_t *next_mddev, *mddev = v;
3927 spin_lock(&all_mddevs_lock);
3929 tmp = all_mddevs.next;
3931 tmp = mddev->all_mddevs.next;
3932 if (tmp != &all_mddevs)
3933 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
3935 next_mddev = (void*)2;
3938 spin_unlock(&all_mddevs_lock);
3946 static void md_seq_stop(struct seq_file *seq, void *v)
3950 if (mddev && v != (void*)1 && v != (void*)2)
3954 struct mdstat_info {
3958 static int md_seq_show(struct seq_file *seq, void *v)
3962 struct list_head *tmp2;
3964 struct mdstat_info *mi = seq->private;
3965 struct bitmap *bitmap;
3967 if (v == (void*)1) {
3968 struct mdk_personality *pers;
3969 seq_printf(seq, "Personalities : ");
3970 spin_lock(&pers_lock);
3971 list_for_each_entry(pers, &pers_list, list)
3972 seq_printf(seq, "[%s] ", pers->name);
3974 spin_unlock(&pers_lock);
3975 seq_printf(seq, "\n");
3976 mi->event = atomic_read(&md_event_count);
3979 if (v == (void*)2) {
3984 if (mddev_lock(mddev)!=0)
3986 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
3987 seq_printf(seq, "%s : %sactive", mdname(mddev),
3988 mddev->pers ? "" : "in");
3991 seq_printf(seq, " (read-only)");
3993 seq_printf(seq, "(auto-read-only)");
3994 seq_printf(seq, " %s", mddev->pers->name);
3998 ITERATE_RDEV(mddev,rdev,tmp2) {
3999 char b[BDEVNAME_SIZE];
4000 seq_printf(seq, " %s[%d]",
4001 bdevname(rdev->bdev,b), rdev->desc_nr);
4002 if (test_bit(WriteMostly, &rdev->flags))
4003 seq_printf(seq, "(W)");
4004 if (test_bit(Faulty, &rdev->flags)) {
4005 seq_printf(seq, "(F)");
4007 } else if (rdev->raid_disk < 0)
4008 seq_printf(seq, "(S)"); /* spare */
4012 if (!list_empty(&mddev->disks)) {
4014 seq_printf(seq, "\n %llu blocks",
4015 (unsigned long long)mddev->array_size);
4017 seq_printf(seq, "\n %llu blocks",
4018 (unsigned long long)size);
4020 if (mddev->persistent) {
4021 if (mddev->major_version != 0 ||
4022 mddev->minor_version != 90) {
4023 seq_printf(seq," super %d.%d",
4024 mddev->major_version,
4025 mddev->minor_version);
4028 seq_printf(seq, " super non-persistent");
4031 mddev->pers->status (seq, mddev);
4032 seq_printf(seq, "\n ");
4033 if (mddev->pers->sync_request) {
4034 if (mddev->curr_resync > 2) {
4035 status_resync (seq, mddev);
4036 seq_printf(seq, "\n ");
4037 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4038 seq_printf(seq, "\tresync=DELAYED\n ");
4039 else if (mddev->recovery_cp < MaxSector)
4040 seq_printf(seq, "\tresync=PENDING\n ");
4043 seq_printf(seq, "\n ");
4045 if ((bitmap = mddev->bitmap)) {
4046 unsigned long chunk_kb;
4047 unsigned long flags;
4048 spin_lock_irqsave(&bitmap->lock, flags);
4049 chunk_kb = bitmap->chunksize >> 10;
4050 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4052 bitmap->pages - bitmap->missing_pages,
4054 (bitmap->pages - bitmap->missing_pages)
4055 << (PAGE_SHIFT - 10),
4056 chunk_kb ? chunk_kb : bitmap->chunksize,
4057 chunk_kb ? "KB" : "B");
4059 seq_printf(seq, ", file: ");
4060 seq_path(seq, bitmap->file->f_vfsmnt,
4061 bitmap->file->f_dentry," \t\n");
4064 seq_printf(seq, "\n");
4065 spin_unlock_irqrestore(&bitmap->lock, flags);
4068 seq_printf(seq, "\n");
4070 mddev_unlock(mddev);
4075 static struct seq_operations md_seq_ops = {
4076 .start = md_seq_start,
4077 .next = md_seq_next,
4078 .stop = md_seq_stop,
4079 .show = md_seq_show,
4082 static int md_seq_open(struct inode *inode, struct file *file)
4085 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4089 error = seq_open(file, &md_seq_ops);
4093 struct seq_file *p = file->private_data;
4095 mi->event = atomic_read(&md_event_count);
4100 static int md_seq_release(struct inode *inode, struct file *file)
4102 struct seq_file *m = file->private_data;
4103 struct mdstat_info *mi = m->private;
4106 return seq_release(inode, file);
4109 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4111 struct seq_file *m = filp->private_data;
4112 struct mdstat_info *mi = m->private;
4115 poll_wait(filp, &md_event_waiters, wait);
4117 /* always allow read */
4118 mask = POLLIN | POLLRDNORM;
4120 if (mi->event != atomic_read(&md_event_count))
4121 mask |= POLLERR | POLLPRI;
4125 static struct file_operations md_seq_fops = {
4126 .open = md_seq_open,
4128 .llseek = seq_lseek,
4129 .release = md_seq_release,
4130 .poll = mdstat_poll,
4133 int register_md_personality(struct mdk_personality *p)
4135 spin_lock(&pers_lock);
4136 list_add_tail(&p->list, &pers_list);
4137 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
4138 spin_unlock(&pers_lock);
4142 int unregister_md_personality(struct mdk_personality *p)
4144 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
4145 spin_lock(&pers_lock);
4146 list_del_init(&p->list);
4147 spin_unlock(&pers_lock);
4151 static int is_mddev_idle(mddev_t *mddev)
4154 struct list_head *tmp;
4156 unsigned long curr_events;
4159 ITERATE_RDEV(mddev,rdev,tmp) {
4160 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
4161 curr_events = disk_stat_read(disk, sectors[0]) +
4162 disk_stat_read(disk, sectors[1]) -
4163 atomic_read(&disk->sync_io);
4164 /* The difference between curr_events and last_events
4165 * will be affected by any new non-sync IO (making
4166 * curr_events bigger) and any difference in the amount of
4167 * in-flight syncio (making current_events bigger or smaller)
4168 * The amount in-flight is currently limited to
4169 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4170 * which is at most 4096 sectors.
4171 * These numbers are fairly fragile and should be made
4172 * more robust, probably by enforcing the
4173 * 'window size' that md_do_sync sort-of uses.
4175 * Note: the following is an unsigned comparison.
4177 if ((curr_events - rdev->last_events + 4096) > 8192) {
4178 rdev->last_events = curr_events;
4185 void md_done_sync(mddev_t *mddev, int blocks, int ok)
4187 /* another "blocks" (512byte) blocks have been synced */
4188 atomic_sub(blocks, &mddev->recovery_active);
4189 wake_up(&mddev->recovery_wait);
4191 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4192 md_wakeup_thread(mddev->thread);
4193 // stop recovery, signal do_sync ....
4198 /* md_write_start(mddev, bi)
4199 * If we need to update some array metadata (e.g. 'active' flag
4200 * in superblock) before writing, schedule a superblock update
4201 * and wait for it to complete.
4203 void md_write_start(mddev_t *mddev, struct bio *bi)
4205 if (bio_data_dir(bi) != WRITE)
4208 BUG_ON(mddev->ro == 1);
4209 if (mddev->ro == 2) {
4210 /* need to switch to read/write */
4212 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4213 md_wakeup_thread(mddev->thread);
4215 atomic_inc(&mddev->writes_pending);
4216 if (mddev->in_sync) {
4217 spin_lock_irq(&mddev->write_lock);
4218 if (mddev->in_sync) {
4220 mddev->sb_dirty = 1;
4221 md_wakeup_thread(mddev->thread);
4223 spin_unlock_irq(&mddev->write_lock);
4225 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
4228 void md_write_end(mddev_t *mddev)
4230 if (atomic_dec_and_test(&mddev->writes_pending)) {
4231 if (mddev->safemode == 2)
4232 md_wakeup_thread(mddev->thread);
4234 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4238 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
4240 #define SYNC_MARKS 10
4241 #define SYNC_MARK_STEP (3*HZ)
4242 static void md_do_sync(mddev_t *mddev)
4245 unsigned int currspeed = 0,
4247 sector_t max_sectors,j, io_sectors;
4248 unsigned long mark[SYNC_MARKS];
4249 sector_t mark_cnt[SYNC_MARKS];
4251 struct list_head *tmp;
4252 sector_t last_check;
4255 /* just incase thread restarts... */
4256 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4259 /* we overload curr_resync somewhat here.
4260 * 0 == not engaged in resync at all
4261 * 2 == checking that there is no conflict with another sync
4262 * 1 == like 2, but have yielded to allow conflicting resync to
4264 * other == active in resync - this many blocks
4266 * Before starting a resync we must have set curr_resync to
4267 * 2, and then checked that every "conflicting" array has curr_resync
4268 * less than ours. When we find one that is the same or higher
4269 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4270 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4271 * This will mean we have to start checking from the beginning again.
4276 mddev->curr_resync = 2;
4279 if (kthread_should_stop()) {
4280 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4283 ITERATE_MDDEV(mddev2,tmp) {
4284 if (mddev2 == mddev)
4286 if (mddev2->curr_resync &&
4287 match_mddev_units(mddev,mddev2)) {
4289 if (mddev < mddev2 && mddev->curr_resync == 2) {
4290 /* arbitrarily yield */
4291 mddev->curr_resync = 1;
4292 wake_up(&resync_wait);
4294 if (mddev > mddev2 && mddev->curr_resync == 1)
4295 /* no need to wait here, we can wait the next
4296 * time 'round when curr_resync == 2
4299 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4300 if (!kthread_should_stop() &&
4301 mddev2->curr_resync >= mddev->curr_resync) {
4302 printk(KERN_INFO "md: delaying resync of %s"
4303 " until %s has finished resync (they"
4304 " share one or more physical units)\n",
4305 mdname(mddev), mdname(mddev2));
4308 finish_wait(&resync_wait, &wq);
4311 finish_wait(&resync_wait, &wq);
4314 } while (mddev->curr_resync < 2);
4316 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4317 /* resync follows the size requested by the personality,
4318 * which defaults to physical size, but can be virtual size
4320 max_sectors = mddev->resync_max_sectors;
4321 mddev->resync_mismatches = 0;
4323 /* recovery follows the physical size of devices */
4324 max_sectors = mddev->size << 1;
4326 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4327 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4328 " %d KB/sec/disc.\n", sysctl_speed_limit_min);
4329 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
4330 "(but not more than %d KB/sec) for reconstruction.\n",
4331 sysctl_speed_limit_max);
4333 is_mddev_idle(mddev); /* this also initializes IO event counters */
4334 /* we don't use the checkpoint if there's a bitmap */
4335 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4336 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4337 j = mddev->recovery_cp;
4341 for (m = 0; m < SYNC_MARKS; m++) {
4343 mark_cnt[m] = io_sectors;
4346 mddev->resync_mark = mark[last_mark];
4347 mddev->resync_mark_cnt = mark_cnt[last_mark];
4350 * Tune reconstruction:
4352 window = 32*(PAGE_SIZE/512);
4353 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4354 window/2,(unsigned long long) max_sectors/2);
4356 atomic_set(&mddev->recovery_active, 0);
4357 init_waitqueue_head(&mddev->recovery_wait);
4362 "md: resuming recovery of %s from checkpoint.\n",
4364 mddev->curr_resync = j;
4367 while (j < max_sectors) {
4371 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4372 currspeed < sysctl_speed_limit_min);
4374 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4378 if (!skipped) { /* actual IO requested */
4379 io_sectors += sectors;
4380 atomic_add(sectors, &mddev->recovery_active);
4384 if (j>1) mddev->curr_resync = j;
4385 if (last_check == 0)
4386 /* this is the earliers that rebuilt will be
4387 * visible in /proc/mdstat
4389 md_new_event(mddev);
4391 if (last_check + window > io_sectors || j == max_sectors)
4394 last_check = io_sectors;
4396 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4397 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4401 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4403 int next = (last_mark+1) % SYNC_MARKS;
4405 mddev->resync_mark = mark[next];
4406 mddev->resync_mark_cnt = mark_cnt[next];
4407 mark[next] = jiffies;
4408 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
4413 if (kthread_should_stop()) {
4415 * got a signal, exit.
4418 "md: md_do_sync() got signal ... exiting\n");
4419 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4424 * this loop exits only if either when we are slower than
4425 * the 'hard' speed limit, or the system was IO-idle for
4427 * the system might be non-idle CPU-wise, but we only care
4428 * about not overloading the IO subsystem. (things like an
4429 * e2fsck being done on the RAID array should execute fast)
4431 mddev->queue->unplug_fn(mddev->queue);
4434 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4435 /((jiffies-mddev->resync_mark)/HZ +1) +1;
4437 if (currspeed > sysctl_speed_limit_min) {
4438 if ((currspeed > sysctl_speed_limit_max) ||
4439 !is_mddev_idle(mddev)) {
4445 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4447 * this also signals 'finished resyncing' to md_stop
4450 mddev->queue->unplug_fn(mddev->queue);
4452 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4454 /* tell personality that we are finished */
4455 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
4457 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4458 mddev->curr_resync > 2 &&
4459 mddev->curr_resync >= mddev->recovery_cp) {
4460 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4462 "md: checkpointing recovery of %s.\n",
4464 mddev->recovery_cp = mddev->curr_resync;
4466 mddev->recovery_cp = MaxSector;
4470 mddev->curr_resync = 0;
4471 wake_up(&resync_wait);
4472 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4473 md_wakeup_thread(mddev->thread);
4478 * This routine is regularly called by all per-raid-array threads to
4479 * deal with generic issues like resync and super-block update.
4480 * Raid personalities that don't have a thread (linear/raid0) do not
4481 * need this as they never do any recovery or update the superblock.
4483 * It does not do any resync itself, but rather "forks" off other threads
4484 * to do that as needed.
4485 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4486 * "->recovery" and create a thread at ->sync_thread.
4487 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4488 * and wakeups up this thread which will reap the thread and finish up.
4489 * This thread also removes any faulty devices (with nr_pending == 0).
4491 * The overall approach is:
4492 * 1/ if the superblock needs updating, update it.
4493 * 2/ If a recovery thread is running, don't do anything else.
4494 * 3/ If recovery has finished, clean up, possibly marking spares active.
4495 * 4/ If there are any faulty devices, remove them.
4496 * 5/ If array is degraded, try to add spares devices
4497 * 6/ If array has spares or is not in-sync, start a resync thread.
4499 void md_check_recovery(mddev_t *mddev)
4502 struct list_head *rtmp;
4506 bitmap_daemon_work(mddev->bitmap);
4511 if (signal_pending(current)) {
4512 if (mddev->pers->sync_request) {
4513 printk(KERN_INFO "md: %s in immediate safe mode\n",
4515 mddev->safemode = 2;
4517 flush_signals(current);
4522 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
4523 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4524 (mddev->safemode == 1) ||
4525 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4526 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
4530 if (mddev_trylock(mddev)==0) {
4533 spin_lock_irq(&mddev->write_lock);
4534 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4535 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4537 mddev->sb_dirty = 1;
4539 if (mddev->safemode == 1)
4540 mddev->safemode = 0;
4541 spin_unlock_irq(&mddev->write_lock);
4543 if (mddev->sb_dirty)
4544 md_update_sb(mddev);
4547 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4548 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4549 /* resync/recovery still happening */
4550 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4553 if (mddev->sync_thread) {
4554 /* resync has finished, collect result */
4555 md_unregister_thread(mddev->sync_thread);
4556 mddev->sync_thread = NULL;
4557 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4558 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4560 /* activate any spares */
4561 mddev->pers->spare_active(mddev);
4563 md_update_sb(mddev);
4565 /* if array is no-longer degraded, then any saved_raid_disk
4566 * information must be scrapped
4568 if (!mddev->degraded)
4569 ITERATE_RDEV(mddev,rdev,rtmp)
4570 rdev->saved_raid_disk = -1;
4572 mddev->recovery = 0;
4573 /* flag recovery needed just to double check */
4574 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4575 md_new_event(mddev);
4578 /* Clear some bits that don't mean anything, but
4581 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4582 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4583 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4584 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
4586 /* no recovery is running.
4587 * remove any failed drives, then
4588 * add spares if possible.
4589 * Spare are also removed and re-added, to allow
4590 * the personality to fail the re-add.
4592 ITERATE_RDEV(mddev,rdev,rtmp)
4593 if (rdev->raid_disk >= 0 &&
4594 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
4595 atomic_read(&rdev->nr_pending)==0) {
4596 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4598 sprintf(nm,"rd%d", rdev->raid_disk);
4599 sysfs_remove_link(&mddev->kobj, nm);
4600 rdev->raid_disk = -1;
4604 if (mddev->degraded) {
4605 ITERATE_RDEV(mddev,rdev,rtmp)
4606 if (rdev->raid_disk < 0
4607 && !test_bit(Faulty, &rdev->flags)) {
4608 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4610 sprintf(nm, "rd%d", rdev->raid_disk);
4611 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
4613 md_new_event(mddev);
4620 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4621 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4622 } else if (mddev->recovery_cp < MaxSector) {
4623 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4624 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4625 /* nothing to be done ... */
4628 if (mddev->pers->sync_request) {
4629 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4630 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4631 /* We are adding a device or devices to an array
4632 * which has the bitmap stored on all devices.
4633 * So make sure all bitmap pages get written
4635 bitmap_write_all(mddev->bitmap);
4637 mddev->sync_thread = md_register_thread(md_do_sync,
4640 if (!mddev->sync_thread) {
4641 printk(KERN_ERR "%s: could not start resync"
4644 /* leave the spares where they are, it shouldn't hurt */
4645 mddev->recovery = 0;
4647 md_wakeup_thread(mddev->sync_thread);
4648 md_new_event(mddev);
4651 mddev_unlock(mddev);
4655 static int md_notify_reboot(struct notifier_block *this,
4656 unsigned long code, void *x)
4658 struct list_head *tmp;
4661 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4663 printk(KERN_INFO "md: stopping all md devices.\n");
4665 ITERATE_MDDEV(mddev,tmp)
4666 if (mddev_trylock(mddev)==0)
4667 do_md_stop (mddev, 1);
4669 * certain more exotic SCSI devices are known to be
4670 * volatile wrt too early system reboots. While the
4671 * right place to handle this issue is the given
4672 * driver, we do want to have a safe RAID driver ...
4679 static struct notifier_block md_notifier = {
4680 .notifier_call = md_notify_reboot,
4682 .priority = INT_MAX, /* before any real devices */
4685 static void md_geninit(void)
4687 struct proc_dir_entry *p;
4689 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4691 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4693 p->proc_fops = &md_seq_fops;
4696 static int __init md_init(void)
4700 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4701 " MD_SB_DISKS=%d\n",
4702 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4703 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
4704 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
4707 if (register_blkdev(MAJOR_NR, "md"))
4709 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4710 unregister_blkdev(MAJOR_NR, "md");
4714 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4715 md_probe, NULL, NULL);
4716 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4717 md_probe, NULL, NULL);
4719 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4720 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4721 S_IFBLK|S_IRUSR|S_IWUSR,
4724 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4725 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4726 S_IFBLK|S_IRUSR|S_IWUSR,
4730 register_reboot_notifier(&md_notifier);
4731 raid_table_header = register_sysctl_table(raid_root_table, 1);
4741 * Searches all registered partitions for autorun RAID arrays
4744 static dev_t detected_devices[128];
4747 void md_autodetect_dev(dev_t dev)
4749 if (dev_cnt >= 0 && dev_cnt < 127)
4750 detected_devices[dev_cnt++] = dev;
4754 static void autostart_arrays(int part)
4759 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4761 for (i = 0; i < dev_cnt; i++) {
4762 dev_t dev = detected_devices[i];
4764 rdev = md_import_device(dev,0, 0);
4768 if (test_bit(Faulty, &rdev->flags)) {
4772 list_add(&rdev->same_set, &pending_raid_disks);
4776 autorun_devices(part);
4781 static __exit void md_exit(void)
4784 struct list_head *tmp;
4786 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4787 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4788 for (i=0; i < MAX_MD_DEVS; i++)
4789 devfs_remove("md/%d", i);
4790 for (i=0; i < MAX_MD_DEVS; i++)
4791 devfs_remove("md/d%d", i);
4795 unregister_blkdev(MAJOR_NR,"md");
4796 unregister_blkdev(mdp_major, "mdp");
4797 unregister_reboot_notifier(&md_notifier);
4798 unregister_sysctl_table(raid_table_header);
4799 remove_proc_entry("mdstat", NULL);
4800 ITERATE_MDDEV(mddev,tmp) {
4801 struct gendisk *disk = mddev->gendisk;
4804 export_array(mddev);
4807 mddev->gendisk = NULL;
4812 module_init(md_init)
4813 module_exit(md_exit)
4815 static int get_ro(char *buffer, struct kernel_param *kp)
4817 return sprintf(buffer, "%d", start_readonly);
4819 static int set_ro(const char *val, struct kernel_param *kp)
4822 int num = simple_strtoul(val, &e, 10);
4823 if (*val && (*e == '\0' || *e == '\n')) {
4824 start_readonly = num;
4830 module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
4831 module_param(start_dirty_degraded, int, 0644);
4834 EXPORT_SYMBOL(register_md_personality);
4835 EXPORT_SYMBOL(unregister_md_personality);
4836 EXPORT_SYMBOL(md_error);
4837 EXPORT_SYMBOL(md_done_sync);
4838 EXPORT_SYMBOL(md_write_start);
4839 EXPORT_SYMBOL(md_write_end);
4840 EXPORT_SYMBOL(md_register_thread);
4841 EXPORT_SYMBOL(md_unregister_thread);
4842 EXPORT_SYMBOL(md_wakeup_thread);
4843 EXPORT_SYMBOL(md_print_devices);
4844 EXPORT_SYMBOL(md_check_recovery);
4845 MODULE_LICENSE("GPL");
4847 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);