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/kernel.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/buffer_head.h> /* for invalidate_bdev */
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/ctype.h>
46 #include <linux/freezer.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part);
72 static LIST_HEAD(pers_list);
73 static DEFINE_SPINLOCK(pers_lock);
75 static void md_print_devices(void);
77 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
83 * the RAID driver will use the maximum available bandwidth if the IO
84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
89 * or /sys/block/mdX/md/sync_speed_{min,max}
92 static int sysctl_speed_limit_min = 1000;
93 static int sysctl_speed_limit_max = 200000;
94 static inline int speed_min(mddev_t *mddev)
96 return mddev->sync_speed_min ?
97 mddev->sync_speed_min : sysctl_speed_limit_min;
100 static inline int speed_max(mddev_t *mddev)
102 return mddev->sync_speed_max ?
103 mddev->sync_speed_max : sysctl_speed_limit_max;
106 static struct ctl_table_header *raid_table_header;
108 static ctl_table raid_table[] = {
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
111 .procname = "speed_limit_min",
112 .data = &sysctl_speed_limit_min,
113 .maxlen = sizeof(int),
114 .mode = S_IRUGO|S_IWUSR,
115 .proc_handler = &proc_dointvec,
118 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
122 .mode = S_IRUGO|S_IWUSR,
123 .proc_handler = &proc_dointvec,
128 static ctl_table raid_dir_table[] = {
130 .ctl_name = DEV_RAID,
133 .mode = S_IRUGO|S_IXUGO,
139 static ctl_table raid_root_table[] = {
145 .child = raid_dir_table,
150 static struct block_device_operations md_fops;
152 static int start_readonly;
155 * We have a system wide 'event count' that is incremented
156 * on any 'interesting' event, and readers of /proc/mdstat
157 * can use 'poll' or 'select' to find out when the event
161 * start array, stop array, error, add device, remove device,
162 * start build, activate spare
164 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
165 static atomic_t md_event_count;
166 void md_new_event(mddev_t *mddev)
168 atomic_inc(&md_event_count);
169 wake_up(&md_event_waiters);
170 sysfs_notify(&mddev->kobj, NULL, "sync_action");
172 EXPORT_SYMBOL_GPL(md_new_event);
174 /* Alternate version that can be called from interrupts
175 * when calling sysfs_notify isn't needed.
177 static void md_new_event_inintr(mddev_t *mddev)
179 atomic_inc(&md_event_count);
180 wake_up(&md_event_waiters);
184 * Enables to iterate over all existing md arrays
185 * all_mddevs_lock protects this list.
187 static LIST_HEAD(all_mddevs);
188 static DEFINE_SPINLOCK(all_mddevs_lock);
192 * iterates through all used mddevs in the system.
193 * We take care to grab the all_mddevs_lock whenever navigating
194 * the list, and to always hold a refcount when unlocked.
195 * Any code which breaks out of this loop while own
196 * a reference to the current mddev and must mddev_put it.
198 #define ITERATE_MDDEV(mddev,tmp) \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
214 static int md_fail_request (request_queue_t *q, struct bio *bio)
216 bio_io_error(bio, bio->bi_size);
220 static inline mddev_t *mddev_get(mddev_t *mddev)
222 atomic_inc(&mddev->active);
226 static void mddev_put(mddev_t *mddev)
228 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
230 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
231 list_del(&mddev->all_mddevs);
232 spin_unlock(&all_mddevs_lock);
233 blk_cleanup_queue(mddev->queue);
234 kobject_unregister(&mddev->kobj);
236 spin_unlock(&all_mddevs_lock);
239 static mddev_t * mddev_find(dev_t unit)
241 mddev_t *mddev, *new = NULL;
244 spin_lock(&all_mddevs_lock);
245 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
246 if (mddev->unit == unit) {
248 spin_unlock(&all_mddevs_lock);
254 list_add(&new->all_mddevs, &all_mddevs);
255 spin_unlock(&all_mddevs_lock);
258 spin_unlock(&all_mddevs_lock);
260 new = kzalloc(sizeof(*new), GFP_KERNEL);
265 if (MAJOR(unit) == MD_MAJOR)
266 new->md_minor = MINOR(unit);
268 new->md_minor = MINOR(unit) >> MdpMinorShift;
270 mutex_init(&new->reconfig_mutex);
271 INIT_LIST_HEAD(&new->disks);
272 INIT_LIST_HEAD(&new->all_mddevs);
273 init_timer(&new->safemode_timer);
274 atomic_set(&new->active, 1);
275 spin_lock_init(&new->write_lock);
276 init_waitqueue_head(&new->sb_wait);
278 new->queue = blk_alloc_queue(GFP_KERNEL);
283 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
285 blk_queue_make_request(new->queue, md_fail_request);
290 static inline int mddev_lock(mddev_t * mddev)
292 return mutex_lock_interruptible(&mddev->reconfig_mutex);
295 static inline int mddev_trylock(mddev_t * mddev)
297 return mutex_trylock(&mddev->reconfig_mutex);
300 static inline void mddev_unlock(mddev_t * mddev)
302 mutex_unlock(&mddev->reconfig_mutex);
304 md_wakeup_thread(mddev->thread);
307 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
310 struct list_head *tmp;
312 ITERATE_RDEV(mddev,rdev,tmp) {
313 if (rdev->desc_nr == nr)
319 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
321 struct list_head *tmp;
324 ITERATE_RDEV(mddev,rdev,tmp) {
325 if (rdev->bdev->bd_dev == dev)
331 static struct mdk_personality *find_pers(int level, char *clevel)
333 struct mdk_personality *pers;
334 list_for_each_entry(pers, &pers_list, list) {
335 if (level != LEVEL_NONE && pers->level == level)
337 if (strcmp(pers->name, clevel)==0)
343 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
345 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
346 return MD_NEW_SIZE_BLOCKS(size);
349 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
353 size = rdev->sb_offset;
356 size &= ~((sector_t)chunk_size/1024 - 1);
360 static int alloc_disk_sb(mdk_rdev_t * rdev)
365 rdev->sb_page = alloc_page(GFP_KERNEL);
366 if (!rdev->sb_page) {
367 printk(KERN_ALERT "md: out of memory.\n");
374 static void free_disk_sb(mdk_rdev_t * rdev)
377 put_page(rdev->sb_page);
379 rdev->sb_page = NULL;
386 static int super_written(struct bio *bio, unsigned int bytes_done, int error)
388 mdk_rdev_t *rdev = bio->bi_private;
389 mddev_t *mddev = rdev->mddev;
393 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
394 printk("md: super_written gets error=%d, uptodate=%d\n",
395 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
396 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
397 md_error(mddev, rdev);
400 if (atomic_dec_and_test(&mddev->pending_writes))
401 wake_up(&mddev->sb_wait);
406 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
408 struct bio *bio2 = bio->bi_private;
409 mdk_rdev_t *rdev = bio2->bi_private;
410 mddev_t *mddev = rdev->mddev;
414 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
415 error == -EOPNOTSUPP) {
417 /* barriers don't appear to be supported :-( */
418 set_bit(BarriersNotsupp, &rdev->flags);
419 mddev->barriers_work = 0;
420 spin_lock_irqsave(&mddev->write_lock, flags);
421 bio2->bi_next = mddev->biolist;
422 mddev->biolist = bio2;
423 spin_unlock_irqrestore(&mddev->write_lock, flags);
424 wake_up(&mddev->sb_wait);
429 bio->bi_private = rdev;
430 return super_written(bio, bytes_done, error);
433 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
434 sector_t sector, int size, struct page *page)
436 /* write first size bytes of page to sector of rdev
437 * Increment mddev->pending_writes before returning
438 * and decrement it on completion, waking up sb_wait
439 * if zero is reached.
440 * If an error occurred, call md_error
442 * As we might need to resubmit the request if BIO_RW_BARRIER
443 * causes ENOTSUPP, we allocate a spare bio...
445 struct bio *bio = bio_alloc(GFP_NOIO, 1);
446 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
448 bio->bi_bdev = rdev->bdev;
449 bio->bi_sector = sector;
450 bio_add_page(bio, page, size, 0);
451 bio->bi_private = rdev;
452 bio->bi_end_io = super_written;
455 atomic_inc(&mddev->pending_writes);
456 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
458 rw |= (1<<BIO_RW_BARRIER);
459 rbio = bio_clone(bio, GFP_NOIO);
460 rbio->bi_private = bio;
461 rbio->bi_end_io = super_written_barrier;
462 submit_bio(rw, rbio);
467 void md_super_wait(mddev_t *mddev)
469 /* wait for all superblock writes that were scheduled to complete.
470 * if any had to be retried (due to BARRIER problems), retry them
474 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
475 if (atomic_read(&mddev->pending_writes)==0)
477 while (mddev->biolist) {
479 spin_lock_irq(&mddev->write_lock);
480 bio = mddev->biolist;
481 mddev->biolist = bio->bi_next ;
483 spin_unlock_irq(&mddev->write_lock);
484 submit_bio(bio->bi_rw, bio);
488 finish_wait(&mddev->sb_wait, &wq);
491 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
496 complete((struct completion*)bio->bi_private);
500 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
501 struct page *page, int rw)
503 struct bio *bio = bio_alloc(GFP_NOIO, 1);
504 struct completion event;
507 rw |= (1 << BIO_RW_SYNC);
510 bio->bi_sector = sector;
511 bio_add_page(bio, page, size, 0);
512 init_completion(&event);
513 bio->bi_private = &event;
514 bio->bi_end_io = bi_complete;
516 wait_for_completion(&event);
518 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
522 EXPORT_SYMBOL_GPL(sync_page_io);
524 static int read_disk_sb(mdk_rdev_t * rdev, int size)
526 char b[BDEVNAME_SIZE];
527 if (!rdev->sb_page) {
535 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
541 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
542 bdevname(rdev->bdev,b));
546 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
548 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
549 (sb1->set_uuid1 == sb2->set_uuid1) &&
550 (sb1->set_uuid2 == sb2->set_uuid2) &&
551 (sb1->set_uuid3 == sb2->set_uuid3))
559 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
562 mdp_super_t *tmp1, *tmp2;
564 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
565 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
567 if (!tmp1 || !tmp2) {
569 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
577 * nr_disks is not constant
582 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
594 static u32 md_csum_fold(u32 csum)
596 csum = (csum & 0xffff) + (csum >> 16);
597 return (csum & 0xffff) + (csum >> 16);
600 static unsigned int calc_sb_csum(mdp_super_t * sb)
603 u32 *sb32 = (u32*)sb;
605 unsigned int disk_csum, csum;
607 disk_csum = sb->sb_csum;
610 for (i = 0; i < MD_SB_BYTES/4 ; i++)
612 csum = (newcsum & 0xffffffff) + (newcsum>>32);
616 /* This used to use csum_partial, which was wrong for several
617 * reasons including that different results are returned on
618 * different architectures. It isn't critical that we get exactly
619 * the same return value as before (we always csum_fold before
620 * testing, and that removes any differences). However as we
621 * know that csum_partial always returned a 16bit value on
622 * alphas, do a fold to maximise conformity to previous behaviour.
624 sb->sb_csum = md_csum_fold(disk_csum);
626 sb->sb_csum = disk_csum;
633 * Handle superblock details.
634 * We want to be able to handle multiple superblock formats
635 * so we have a common interface to them all, and an array of
636 * different handlers.
637 * We rely on user-space to write the initial superblock, and support
638 * reading and updating of superblocks.
639 * Interface methods are:
640 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
641 * loads and validates a superblock on dev.
642 * if refdev != NULL, compare superblocks on both devices
644 * 0 - dev has a superblock that is compatible with refdev
645 * 1 - dev has a superblock that is compatible and newer than refdev
646 * so dev should be used as the refdev in future
647 * -EINVAL superblock incompatible or invalid
648 * -othererror e.g. -EIO
650 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
651 * Verify that dev is acceptable into mddev.
652 * The first time, mddev->raid_disks will be 0, and data from
653 * dev should be merged in. Subsequent calls check that dev
654 * is new enough. Return 0 or -EINVAL
656 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
657 * Update the superblock for rdev with data in mddev
658 * This does not write to disc.
664 struct module *owner;
665 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
666 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
667 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
671 * load_super for 0.90.0
673 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
675 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
681 * Calculate the position of the superblock,
682 * it's at the end of the disk.
684 * It also happens to be a multiple of 4Kb.
686 sb_offset = calc_dev_sboffset(rdev->bdev);
687 rdev->sb_offset = sb_offset;
689 ret = read_disk_sb(rdev, MD_SB_BYTES);
694 bdevname(rdev->bdev, b);
695 sb = (mdp_super_t*)page_address(rdev->sb_page);
697 if (sb->md_magic != MD_SB_MAGIC) {
698 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
703 if (sb->major_version != 0 ||
704 sb->minor_version < 90 ||
705 sb->minor_version > 91) {
706 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
707 sb->major_version, sb->minor_version,
712 if (sb->raid_disks <= 0)
715 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
716 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
721 rdev->preferred_minor = sb->md_minor;
722 rdev->data_offset = 0;
723 rdev->sb_size = MD_SB_BYTES;
725 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
726 if (sb->level != 1 && sb->level != 4
727 && sb->level != 5 && sb->level != 6
728 && sb->level != 10) {
729 /* FIXME use a better test */
731 "md: bitmaps not supported for this level.\n");
736 if (sb->level == LEVEL_MULTIPATH)
739 rdev->desc_nr = sb->this_disk.number;
745 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
746 if (!uuid_equal(refsb, sb)) {
747 printk(KERN_WARNING "md: %s has different UUID to %s\n",
748 b, bdevname(refdev->bdev,b2));
751 if (!sb_equal(refsb, sb)) {
752 printk(KERN_WARNING "md: %s has same UUID"
753 " but different superblock to %s\n",
754 b, bdevname(refdev->bdev, b2));
758 ev2 = md_event(refsb);
764 rdev->size = calc_dev_size(rdev, sb->chunk_size);
766 if (rdev->size < sb->size && sb->level > 1)
767 /* "this cannot possibly happen" ... */
775 * validate_super for 0.90.0
777 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
780 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
781 __u64 ev1 = md_event(sb);
783 rdev->raid_disk = -1;
785 if (mddev->raid_disks == 0) {
786 mddev->major_version = 0;
787 mddev->minor_version = sb->minor_version;
788 mddev->patch_version = sb->patch_version;
789 mddev->persistent = ! sb->not_persistent;
790 mddev->chunk_size = sb->chunk_size;
791 mddev->ctime = sb->ctime;
792 mddev->utime = sb->utime;
793 mddev->level = sb->level;
794 mddev->clevel[0] = 0;
795 mddev->layout = sb->layout;
796 mddev->raid_disks = sb->raid_disks;
797 mddev->size = sb->size;
799 mddev->bitmap_offset = 0;
800 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
802 if (mddev->minor_version >= 91) {
803 mddev->reshape_position = sb->reshape_position;
804 mddev->delta_disks = sb->delta_disks;
805 mddev->new_level = sb->new_level;
806 mddev->new_layout = sb->new_layout;
807 mddev->new_chunk = sb->new_chunk;
809 mddev->reshape_position = MaxSector;
810 mddev->delta_disks = 0;
811 mddev->new_level = mddev->level;
812 mddev->new_layout = mddev->layout;
813 mddev->new_chunk = mddev->chunk_size;
816 if (sb->state & (1<<MD_SB_CLEAN))
817 mddev->recovery_cp = MaxSector;
819 if (sb->events_hi == sb->cp_events_hi &&
820 sb->events_lo == sb->cp_events_lo) {
821 mddev->recovery_cp = sb->recovery_cp;
823 mddev->recovery_cp = 0;
826 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
827 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
828 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
829 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
831 mddev->max_disks = MD_SB_DISKS;
833 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
834 mddev->bitmap_file == NULL)
835 mddev->bitmap_offset = mddev->default_bitmap_offset;
837 } else if (mddev->pers == NULL) {
838 /* Insist on good event counter while assembling */
840 if (ev1 < mddev->events)
842 } else if (mddev->bitmap) {
843 /* if adding to array with a bitmap, then we can accept an
844 * older device ... but not too old.
846 if (ev1 < mddev->bitmap->events_cleared)
849 if (ev1 < mddev->events)
850 /* just a hot-add of a new device, leave raid_disk at -1 */
854 if (mddev->level != LEVEL_MULTIPATH) {
855 desc = sb->disks + rdev->desc_nr;
857 if (desc->state & (1<<MD_DISK_FAULTY))
858 set_bit(Faulty, &rdev->flags);
859 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
860 desc->raid_disk < mddev->raid_disks */) {
861 set_bit(In_sync, &rdev->flags);
862 rdev->raid_disk = desc->raid_disk;
864 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
865 set_bit(WriteMostly, &rdev->flags);
866 } else /* MULTIPATH are always insync */
867 set_bit(In_sync, &rdev->flags);
872 * sync_super for 0.90.0
874 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
877 struct list_head *tmp;
879 int next_spare = mddev->raid_disks;
882 /* make rdev->sb match mddev data..
885 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
886 * 3/ any empty disks < next_spare become removed
888 * disks[0] gets initialised to REMOVED because
889 * we cannot be sure from other fields if it has
890 * been initialised or not.
893 int active=0, working=0,failed=0,spare=0,nr_disks=0;
895 rdev->sb_size = MD_SB_BYTES;
897 sb = (mdp_super_t*)page_address(rdev->sb_page);
899 memset(sb, 0, sizeof(*sb));
901 sb->md_magic = MD_SB_MAGIC;
902 sb->major_version = mddev->major_version;
903 sb->patch_version = mddev->patch_version;
904 sb->gvalid_words = 0; /* ignored */
905 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
906 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
907 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
908 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
910 sb->ctime = mddev->ctime;
911 sb->level = mddev->level;
912 sb->size = mddev->size;
913 sb->raid_disks = mddev->raid_disks;
914 sb->md_minor = mddev->md_minor;
915 sb->not_persistent = !mddev->persistent;
916 sb->utime = mddev->utime;
918 sb->events_hi = (mddev->events>>32);
919 sb->events_lo = (u32)mddev->events;
921 if (mddev->reshape_position == MaxSector)
922 sb->minor_version = 90;
924 sb->minor_version = 91;
925 sb->reshape_position = mddev->reshape_position;
926 sb->new_level = mddev->new_level;
927 sb->delta_disks = mddev->delta_disks;
928 sb->new_layout = mddev->new_layout;
929 sb->new_chunk = mddev->new_chunk;
931 mddev->minor_version = sb->minor_version;
934 sb->recovery_cp = mddev->recovery_cp;
935 sb->cp_events_hi = (mddev->events>>32);
936 sb->cp_events_lo = (u32)mddev->events;
937 if (mddev->recovery_cp == MaxSector)
938 sb->state = (1<< MD_SB_CLEAN);
942 sb->layout = mddev->layout;
943 sb->chunk_size = mddev->chunk_size;
945 if (mddev->bitmap && mddev->bitmap_file == NULL)
946 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
948 sb->disks[0].state = (1<<MD_DISK_REMOVED);
949 ITERATE_RDEV(mddev,rdev2,tmp) {
952 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
953 && !test_bit(Faulty, &rdev2->flags))
954 desc_nr = rdev2->raid_disk;
956 desc_nr = next_spare++;
957 rdev2->desc_nr = desc_nr;
958 d = &sb->disks[rdev2->desc_nr];
960 d->number = rdev2->desc_nr;
961 d->major = MAJOR(rdev2->bdev->bd_dev);
962 d->minor = MINOR(rdev2->bdev->bd_dev);
963 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
964 && !test_bit(Faulty, &rdev2->flags))
965 d->raid_disk = rdev2->raid_disk;
967 d->raid_disk = rdev2->desc_nr; /* compatibility */
968 if (test_bit(Faulty, &rdev2->flags))
969 d->state = (1<<MD_DISK_FAULTY);
970 else if (test_bit(In_sync, &rdev2->flags)) {
971 d->state = (1<<MD_DISK_ACTIVE);
972 d->state |= (1<<MD_DISK_SYNC);
980 if (test_bit(WriteMostly, &rdev2->flags))
981 d->state |= (1<<MD_DISK_WRITEMOSTLY);
983 /* now set the "removed" and "faulty" bits on any missing devices */
984 for (i=0 ; i < mddev->raid_disks ; i++) {
985 mdp_disk_t *d = &sb->disks[i];
986 if (d->state == 0 && d->number == 0) {
989 d->state = (1<<MD_DISK_REMOVED);
990 d->state |= (1<<MD_DISK_FAULTY);
994 sb->nr_disks = nr_disks;
995 sb->active_disks = active;
996 sb->working_disks = working;
997 sb->failed_disks = failed;
998 sb->spare_disks = spare;
1000 sb->this_disk = sb->disks[rdev->desc_nr];
1001 sb->sb_csum = calc_sb_csum(sb);
1005 * version 1 superblock
1008 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1012 unsigned long long newcsum;
1013 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1014 __le32 *isuper = (__le32*)sb;
1017 disk_csum = sb->sb_csum;
1020 for (i=0; size>=4; size -= 4 )
1021 newcsum += le32_to_cpu(*isuper++);
1024 newcsum += le16_to_cpu(*(__le16*) isuper);
1026 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1027 sb->sb_csum = disk_csum;
1028 return cpu_to_le32(csum);
1031 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1033 struct mdp_superblock_1 *sb;
1036 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1040 * Calculate the position of the superblock.
1041 * It is always aligned to a 4K boundary and
1042 * depeding on minor_version, it can be:
1043 * 0: At least 8K, but less than 12K, from end of device
1044 * 1: At start of device
1045 * 2: 4K from start of device.
1047 switch(minor_version) {
1049 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1051 sb_offset &= ~(sector_t)(4*2-1);
1052 /* convert from sectors to K */
1064 rdev->sb_offset = sb_offset;
1066 /* superblock is rarely larger than 1K, but it can be larger,
1067 * and it is safe to read 4k, so we do that
1069 ret = read_disk_sb(rdev, 4096);
1070 if (ret) return ret;
1073 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1075 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1076 sb->major_version != cpu_to_le32(1) ||
1077 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1078 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1079 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1082 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1083 printk("md: invalid superblock checksum on %s\n",
1084 bdevname(rdev->bdev,b));
1087 if (le64_to_cpu(sb->data_size) < 10) {
1088 printk("md: data_size too small on %s\n",
1089 bdevname(rdev->bdev,b));
1092 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1093 if (sb->level != cpu_to_le32(1) &&
1094 sb->level != cpu_to_le32(4) &&
1095 sb->level != cpu_to_le32(5) &&
1096 sb->level != cpu_to_le32(6) &&
1097 sb->level != cpu_to_le32(10)) {
1099 "md: bitmaps not supported for this level.\n");
1104 rdev->preferred_minor = 0xffff;
1105 rdev->data_offset = le64_to_cpu(sb->data_offset);
1106 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1108 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1109 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1110 if (rdev->sb_size & bmask)
1111 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1113 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1116 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1122 struct mdp_superblock_1 *refsb =
1123 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1125 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1126 sb->level != refsb->level ||
1127 sb->layout != refsb->layout ||
1128 sb->chunksize != refsb->chunksize) {
1129 printk(KERN_WARNING "md: %s has strangely different"
1130 " superblock to %s\n",
1131 bdevname(rdev->bdev,b),
1132 bdevname(refdev->bdev,b2));
1135 ev1 = le64_to_cpu(sb->events);
1136 ev2 = le64_to_cpu(refsb->events);
1144 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1146 rdev->size = rdev->sb_offset;
1147 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1149 rdev->size = le64_to_cpu(sb->data_size)/2;
1150 if (le32_to_cpu(sb->chunksize))
1151 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1153 if (le64_to_cpu(sb->size) > rdev->size*2)
1158 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1160 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1161 __u64 ev1 = le64_to_cpu(sb->events);
1163 rdev->raid_disk = -1;
1165 if (mddev->raid_disks == 0) {
1166 mddev->major_version = 1;
1167 mddev->patch_version = 0;
1168 mddev->persistent = 1;
1169 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1170 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1171 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1172 mddev->level = le32_to_cpu(sb->level);
1173 mddev->clevel[0] = 0;
1174 mddev->layout = le32_to_cpu(sb->layout);
1175 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1176 mddev->size = le64_to_cpu(sb->size)/2;
1177 mddev->events = ev1;
1178 mddev->bitmap_offset = 0;
1179 mddev->default_bitmap_offset = 1024 >> 9;
1181 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1182 memcpy(mddev->uuid, sb->set_uuid, 16);
1184 mddev->max_disks = (4096-256)/2;
1186 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1187 mddev->bitmap_file == NULL )
1188 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1190 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1191 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1192 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1193 mddev->new_level = le32_to_cpu(sb->new_level);
1194 mddev->new_layout = le32_to_cpu(sb->new_layout);
1195 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1197 mddev->reshape_position = MaxSector;
1198 mddev->delta_disks = 0;
1199 mddev->new_level = mddev->level;
1200 mddev->new_layout = mddev->layout;
1201 mddev->new_chunk = mddev->chunk_size;
1204 } else if (mddev->pers == NULL) {
1205 /* Insist of good event counter while assembling */
1207 if (ev1 < mddev->events)
1209 } else if (mddev->bitmap) {
1210 /* If adding to array with a bitmap, then we can accept an
1211 * older device, but not too old.
1213 if (ev1 < mddev->bitmap->events_cleared)
1216 if (ev1 < mddev->events)
1217 /* just a hot-add of a new device, leave raid_disk at -1 */
1220 if (mddev->level != LEVEL_MULTIPATH) {
1222 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1224 case 0xffff: /* spare */
1226 case 0xfffe: /* faulty */
1227 set_bit(Faulty, &rdev->flags);
1230 if ((le32_to_cpu(sb->feature_map) &
1231 MD_FEATURE_RECOVERY_OFFSET))
1232 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1234 set_bit(In_sync, &rdev->flags);
1235 rdev->raid_disk = role;
1238 if (sb->devflags & WriteMostly1)
1239 set_bit(WriteMostly, &rdev->flags);
1240 } else /* MULTIPATH are always insync */
1241 set_bit(In_sync, &rdev->flags);
1246 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1248 struct mdp_superblock_1 *sb;
1249 struct list_head *tmp;
1252 /* make rdev->sb match mddev and rdev data. */
1254 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1256 sb->feature_map = 0;
1258 sb->recovery_offset = cpu_to_le64(0);
1259 memset(sb->pad1, 0, sizeof(sb->pad1));
1260 memset(sb->pad2, 0, sizeof(sb->pad2));
1261 memset(sb->pad3, 0, sizeof(sb->pad3));
1263 sb->utime = cpu_to_le64((__u64)mddev->utime);
1264 sb->events = cpu_to_le64(mddev->events);
1266 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1268 sb->resync_offset = cpu_to_le64(0);
1270 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1272 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1273 sb->size = cpu_to_le64(mddev->size<<1);
1275 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1276 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1277 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1280 if (rdev->raid_disk >= 0 &&
1281 !test_bit(In_sync, &rdev->flags) &&
1282 rdev->recovery_offset > 0) {
1283 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1284 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1287 if (mddev->reshape_position != MaxSector) {
1288 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1289 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1290 sb->new_layout = cpu_to_le32(mddev->new_layout);
1291 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1292 sb->new_level = cpu_to_le32(mddev->new_level);
1293 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1297 ITERATE_RDEV(mddev,rdev2,tmp)
1298 if (rdev2->desc_nr+1 > max_dev)
1299 max_dev = rdev2->desc_nr+1;
1301 sb->max_dev = cpu_to_le32(max_dev);
1302 for (i=0; i<max_dev;i++)
1303 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1305 ITERATE_RDEV(mddev,rdev2,tmp) {
1307 if (test_bit(Faulty, &rdev2->flags))
1308 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1309 else if (test_bit(In_sync, &rdev2->flags))
1310 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1311 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1312 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1314 sb->dev_roles[i] = cpu_to_le16(0xffff);
1317 sb->sb_csum = calc_sb_1_csum(sb);
1321 static struct super_type super_types[] = {
1324 .owner = THIS_MODULE,
1325 .load_super = super_90_load,
1326 .validate_super = super_90_validate,
1327 .sync_super = super_90_sync,
1331 .owner = THIS_MODULE,
1332 .load_super = super_1_load,
1333 .validate_super = super_1_validate,
1334 .sync_super = super_1_sync,
1338 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1340 struct list_head *tmp, *tmp2;
1341 mdk_rdev_t *rdev, *rdev2;
1343 ITERATE_RDEV(mddev1,rdev,tmp)
1344 ITERATE_RDEV(mddev2, rdev2, tmp2)
1345 if (rdev->bdev->bd_contains ==
1346 rdev2->bdev->bd_contains)
1352 static LIST_HEAD(pending_raid_disks);
1354 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1356 char b[BDEVNAME_SIZE];
1365 /* make sure rdev->size exceeds mddev->size */
1366 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1368 /* Cannot change size, so fail */
1371 mddev->size = rdev->size;
1374 /* Verify rdev->desc_nr is unique.
1375 * If it is -1, assign a free number, else
1376 * check number is not in use
1378 if (rdev->desc_nr < 0) {
1380 if (mddev->pers) choice = mddev->raid_disks;
1381 while (find_rdev_nr(mddev, choice))
1383 rdev->desc_nr = choice;
1385 if (find_rdev_nr(mddev, rdev->desc_nr))
1388 bdevname(rdev->bdev,b);
1389 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1391 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1394 rdev->mddev = mddev;
1395 printk(KERN_INFO "md: bind<%s>\n", b);
1397 rdev->kobj.parent = &mddev->kobj;
1398 if ((err = kobject_add(&rdev->kobj)))
1401 if (rdev->bdev->bd_part)
1402 ko = &rdev->bdev->bd_part->kobj;
1404 ko = &rdev->bdev->bd_disk->kobj;
1405 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1406 kobject_del(&rdev->kobj);
1409 list_add(&rdev->same_set, &mddev->disks);
1410 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1414 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1419 static void delayed_delete(struct work_struct *ws)
1421 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1422 kobject_del(&rdev->kobj);
1425 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1427 char b[BDEVNAME_SIZE];
1432 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1433 list_del_init(&rdev->same_set);
1434 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1436 sysfs_remove_link(&rdev->kobj, "block");
1438 /* We need to delay this, otherwise we can deadlock when
1439 * writing to 'remove' to "dev/state"
1441 INIT_WORK(&rdev->del_work, delayed_delete);
1442 schedule_work(&rdev->del_work);
1446 * prevent the device from being mounted, repartitioned or
1447 * otherwise reused by a RAID array (or any other kernel
1448 * subsystem), by bd_claiming the device.
1450 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1453 struct block_device *bdev;
1454 char b[BDEVNAME_SIZE];
1456 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1458 printk(KERN_ERR "md: could not open %s.\n",
1459 __bdevname(dev, b));
1460 return PTR_ERR(bdev);
1462 err = bd_claim(bdev, rdev);
1464 printk(KERN_ERR "md: could not bd_claim %s.\n",
1473 static void unlock_rdev(mdk_rdev_t *rdev)
1475 struct block_device *bdev = rdev->bdev;
1483 void md_autodetect_dev(dev_t dev);
1485 static void export_rdev(mdk_rdev_t * rdev)
1487 char b[BDEVNAME_SIZE];
1488 printk(KERN_INFO "md: export_rdev(%s)\n",
1489 bdevname(rdev->bdev,b));
1493 list_del_init(&rdev->same_set);
1495 md_autodetect_dev(rdev->bdev->bd_dev);
1498 kobject_put(&rdev->kobj);
1501 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1503 unbind_rdev_from_array(rdev);
1507 static void export_array(mddev_t *mddev)
1509 struct list_head *tmp;
1512 ITERATE_RDEV(mddev,rdev,tmp) {
1517 kick_rdev_from_array(rdev);
1519 if (!list_empty(&mddev->disks))
1521 mddev->raid_disks = 0;
1522 mddev->major_version = 0;
1525 static void print_desc(mdp_disk_t *desc)
1527 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1528 desc->major,desc->minor,desc->raid_disk,desc->state);
1531 static void print_sb(mdp_super_t *sb)
1536 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1537 sb->major_version, sb->minor_version, sb->patch_version,
1538 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1540 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1541 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1542 sb->md_minor, sb->layout, sb->chunk_size);
1543 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1544 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1545 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1546 sb->failed_disks, sb->spare_disks,
1547 sb->sb_csum, (unsigned long)sb->events_lo);
1550 for (i = 0; i < MD_SB_DISKS; i++) {
1553 desc = sb->disks + i;
1554 if (desc->number || desc->major || desc->minor ||
1555 desc->raid_disk || (desc->state && (desc->state != 4))) {
1556 printk(" D %2d: ", i);
1560 printk(KERN_INFO "md: THIS: ");
1561 print_desc(&sb->this_disk);
1565 static void print_rdev(mdk_rdev_t *rdev)
1567 char b[BDEVNAME_SIZE];
1568 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1569 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1570 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1572 if (rdev->sb_loaded) {
1573 printk(KERN_INFO "md: rdev superblock:\n");
1574 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1576 printk(KERN_INFO "md: no rdev superblock!\n");
1579 static void md_print_devices(void)
1581 struct list_head *tmp, *tmp2;
1584 char b[BDEVNAME_SIZE];
1587 printk("md: **********************************\n");
1588 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1589 printk("md: **********************************\n");
1590 ITERATE_MDDEV(mddev,tmp) {
1593 bitmap_print_sb(mddev->bitmap);
1595 printk("%s: ", mdname(mddev));
1596 ITERATE_RDEV(mddev,rdev,tmp2)
1597 printk("<%s>", bdevname(rdev->bdev,b));
1600 ITERATE_RDEV(mddev,rdev,tmp2)
1603 printk("md: **********************************\n");
1608 static void sync_sbs(mddev_t * mddev, int nospares)
1610 /* Update each superblock (in-memory image), but
1611 * if we are allowed to, skip spares which already
1612 * have the right event counter, or have one earlier
1613 * (which would mean they aren't being marked as dirty
1614 * with the rest of the array)
1617 struct list_head *tmp;
1619 ITERATE_RDEV(mddev,rdev,tmp) {
1620 if (rdev->sb_events == mddev->events ||
1622 rdev->raid_disk < 0 &&
1623 (rdev->sb_events&1)==0 &&
1624 rdev->sb_events+1 == mddev->events)) {
1625 /* Don't update this superblock */
1626 rdev->sb_loaded = 2;
1628 super_types[mddev->major_version].
1629 sync_super(mddev, rdev);
1630 rdev->sb_loaded = 1;
1635 static void md_update_sb(mddev_t * mddev, int force_change)
1638 struct list_head *tmp;
1644 spin_lock_irq(&mddev->write_lock);
1646 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1647 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1649 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1650 /* just a clean<-> dirty transition, possibly leave spares alone,
1651 * though if events isn't the right even/odd, we will have to do
1657 if (mddev->degraded)
1658 /* If the array is degraded, then skipping spares is both
1659 * dangerous and fairly pointless.
1660 * Dangerous because a device that was removed from the array
1661 * might have a event_count that still looks up-to-date,
1662 * so it can be re-added without a resync.
1663 * Pointless because if there are any spares to skip,
1664 * then a recovery will happen and soon that array won't
1665 * be degraded any more and the spare can go back to sleep then.
1669 sync_req = mddev->in_sync;
1670 mddev->utime = get_seconds();
1672 /* If this is just a dirty<->clean transition, and the array is clean
1673 * and 'events' is odd, we can roll back to the previous clean state */
1675 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1676 && (mddev->events & 1)
1677 && mddev->events != 1)
1680 /* otherwise we have to go forward and ... */
1682 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1683 /* .. if the array isn't clean, insist on an odd 'events' */
1684 if ((mddev->events&1)==0) {
1689 /* otherwise insist on an even 'events' (for clean states) */
1690 if ((mddev->events&1)) {
1697 if (!mddev->events) {
1699 * oops, this 64-bit counter should never wrap.
1700 * Either we are in around ~1 trillion A.C., assuming
1701 * 1 reboot per second, or we have a bug:
1706 sync_sbs(mddev, nospares);
1709 * do not write anything to disk if using
1710 * nonpersistent superblocks
1712 if (!mddev->persistent) {
1713 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1714 spin_unlock_irq(&mddev->write_lock);
1715 wake_up(&mddev->sb_wait);
1718 spin_unlock_irq(&mddev->write_lock);
1721 "md: updating %s RAID superblock on device (in sync %d)\n",
1722 mdname(mddev),mddev->in_sync);
1724 err = bitmap_update_sb(mddev->bitmap);
1725 ITERATE_RDEV(mddev,rdev,tmp) {
1726 char b[BDEVNAME_SIZE];
1727 dprintk(KERN_INFO "md: ");
1728 if (rdev->sb_loaded != 1)
1729 continue; /* no noise on spare devices */
1730 if (test_bit(Faulty, &rdev->flags))
1731 dprintk("(skipping faulty ");
1733 dprintk("%s ", bdevname(rdev->bdev,b));
1734 if (!test_bit(Faulty, &rdev->flags)) {
1735 md_super_write(mddev,rdev,
1736 rdev->sb_offset<<1, rdev->sb_size,
1738 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1739 bdevname(rdev->bdev,b),
1740 (unsigned long long)rdev->sb_offset);
1741 rdev->sb_events = mddev->events;
1745 if (mddev->level == LEVEL_MULTIPATH)
1746 /* only need to write one superblock... */
1749 md_super_wait(mddev);
1750 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1752 spin_lock_irq(&mddev->write_lock);
1753 if (mddev->in_sync != sync_req ||
1754 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1755 /* have to write it out again */
1756 spin_unlock_irq(&mddev->write_lock);
1759 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1760 spin_unlock_irq(&mddev->write_lock);
1761 wake_up(&mddev->sb_wait);
1765 /* words written to sysfs files may, or my not, be \n terminated.
1766 * We want to accept with case. For this we use cmd_match.
1768 static int cmd_match(const char *cmd, const char *str)
1770 /* See if cmd, written into a sysfs file, matches
1771 * str. They must either be the same, or cmd can
1772 * have a trailing newline
1774 while (*cmd && *str && *cmd == *str) {
1785 struct rdev_sysfs_entry {
1786 struct attribute attr;
1787 ssize_t (*show)(mdk_rdev_t *, char *);
1788 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1792 state_show(mdk_rdev_t *rdev, char *page)
1797 if (test_bit(Faulty, &rdev->flags)) {
1798 len+= sprintf(page+len, "%sfaulty",sep);
1801 if (test_bit(In_sync, &rdev->flags)) {
1802 len += sprintf(page+len, "%sin_sync",sep);
1805 if (test_bit(WriteMostly, &rdev->flags)) {
1806 len += sprintf(page+len, "%swrite_mostly",sep);
1809 if (!test_bit(Faulty, &rdev->flags) &&
1810 !test_bit(In_sync, &rdev->flags)) {
1811 len += sprintf(page+len, "%sspare", sep);
1814 return len+sprintf(page+len, "\n");
1818 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1821 * faulty - simulates and error
1822 * remove - disconnects the device
1823 * writemostly - sets write_mostly
1824 * -writemostly - clears write_mostly
1827 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1828 md_error(rdev->mddev, rdev);
1830 } else if (cmd_match(buf, "remove")) {
1831 if (rdev->raid_disk >= 0)
1834 mddev_t *mddev = rdev->mddev;
1835 kick_rdev_from_array(rdev);
1837 md_update_sb(mddev, 1);
1838 md_new_event(mddev);
1841 } else if (cmd_match(buf, "writemostly")) {
1842 set_bit(WriteMostly, &rdev->flags);
1844 } else if (cmd_match(buf, "-writemostly")) {
1845 clear_bit(WriteMostly, &rdev->flags);
1848 return err ? err : len;
1850 static struct rdev_sysfs_entry rdev_state =
1851 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1854 super_show(mdk_rdev_t *rdev, char *page)
1856 if (rdev->sb_loaded && rdev->sb_size) {
1857 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1858 return rdev->sb_size;
1862 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1865 errors_show(mdk_rdev_t *rdev, char *page)
1867 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1871 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1874 unsigned long n = simple_strtoul(buf, &e, 10);
1875 if (*buf && (*e == 0 || *e == '\n')) {
1876 atomic_set(&rdev->corrected_errors, n);
1881 static struct rdev_sysfs_entry rdev_errors =
1882 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1885 slot_show(mdk_rdev_t *rdev, char *page)
1887 if (rdev->raid_disk < 0)
1888 return sprintf(page, "none\n");
1890 return sprintf(page, "%d\n", rdev->raid_disk);
1894 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1897 int slot = simple_strtoul(buf, &e, 10);
1898 if (strncmp(buf, "none", 4)==0)
1900 else if (e==buf || (*e && *e!= '\n'))
1902 if (rdev->mddev->pers)
1903 /* Cannot set slot in active array (yet) */
1905 if (slot >= rdev->mddev->raid_disks)
1907 rdev->raid_disk = slot;
1908 /* assume it is working */
1910 set_bit(In_sync, &rdev->flags);
1915 static struct rdev_sysfs_entry rdev_slot =
1916 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
1919 offset_show(mdk_rdev_t *rdev, char *page)
1921 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1925 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1928 unsigned long long offset = simple_strtoull(buf, &e, 10);
1929 if (e==buf || (*e && *e != '\n'))
1931 if (rdev->mddev->pers)
1933 rdev->data_offset = offset;
1937 static struct rdev_sysfs_entry rdev_offset =
1938 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
1941 rdev_size_show(mdk_rdev_t *rdev, char *page)
1943 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1947 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1950 unsigned long long size = simple_strtoull(buf, &e, 10);
1951 if (e==buf || (*e && *e != '\n'))
1953 if (rdev->mddev->pers)
1956 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1957 rdev->mddev->size = size;
1961 static struct rdev_sysfs_entry rdev_size =
1962 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
1964 static struct attribute *rdev_default_attrs[] = {
1974 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1976 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1977 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1981 return entry->show(rdev, page);
1985 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1986 const char *page, size_t length)
1988 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1989 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1993 if (!capable(CAP_SYS_ADMIN))
1995 return entry->store(rdev, page, length);
1998 static void rdev_free(struct kobject *ko)
2000 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2003 static struct sysfs_ops rdev_sysfs_ops = {
2004 .show = rdev_attr_show,
2005 .store = rdev_attr_store,
2007 static struct kobj_type rdev_ktype = {
2008 .release = rdev_free,
2009 .sysfs_ops = &rdev_sysfs_ops,
2010 .default_attrs = rdev_default_attrs,
2014 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2016 * mark the device faulty if:
2018 * - the device is nonexistent (zero size)
2019 * - the device has no valid superblock
2021 * a faulty rdev _never_ has rdev->sb set.
2023 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2025 char b[BDEVNAME_SIZE];
2030 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2032 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2033 return ERR_PTR(-ENOMEM);
2036 if ((err = alloc_disk_sb(rdev)))
2039 err = lock_rdev(rdev, newdev);
2043 rdev->kobj.parent = NULL;
2044 rdev->kobj.ktype = &rdev_ktype;
2045 kobject_init(&rdev->kobj);
2048 rdev->saved_raid_disk = -1;
2049 rdev->raid_disk = -1;
2051 rdev->data_offset = 0;
2052 rdev->sb_events = 0;
2053 atomic_set(&rdev->nr_pending, 0);
2054 atomic_set(&rdev->read_errors, 0);
2055 atomic_set(&rdev->corrected_errors, 0);
2057 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2060 "md: %s has zero or unknown size, marking faulty!\n",
2061 bdevname(rdev->bdev,b));
2066 if (super_format >= 0) {
2067 err = super_types[super_format].
2068 load_super(rdev, NULL, super_minor);
2069 if (err == -EINVAL) {
2071 "md: %s has invalid sb, not importing!\n",
2072 bdevname(rdev->bdev,b));
2077 "md: could not read %s's sb, not importing!\n",
2078 bdevname(rdev->bdev,b));
2082 INIT_LIST_HEAD(&rdev->same_set);
2087 if (rdev->sb_page) {
2093 return ERR_PTR(err);
2097 * Check a full RAID array for plausibility
2101 static void analyze_sbs(mddev_t * mddev)
2104 struct list_head *tmp;
2105 mdk_rdev_t *rdev, *freshest;
2106 char b[BDEVNAME_SIZE];
2109 ITERATE_RDEV(mddev,rdev,tmp)
2110 switch (super_types[mddev->major_version].
2111 load_super(rdev, freshest, mddev->minor_version)) {
2119 "md: fatal superblock inconsistency in %s"
2120 " -- removing from array\n",
2121 bdevname(rdev->bdev,b));
2122 kick_rdev_from_array(rdev);
2126 super_types[mddev->major_version].
2127 validate_super(mddev, freshest);
2130 ITERATE_RDEV(mddev,rdev,tmp) {
2131 if (rdev != freshest)
2132 if (super_types[mddev->major_version].
2133 validate_super(mddev, rdev)) {
2134 printk(KERN_WARNING "md: kicking non-fresh %s"
2136 bdevname(rdev->bdev,b));
2137 kick_rdev_from_array(rdev);
2140 if (mddev->level == LEVEL_MULTIPATH) {
2141 rdev->desc_nr = i++;
2142 rdev->raid_disk = rdev->desc_nr;
2143 set_bit(In_sync, &rdev->flags);
2149 if (mddev->recovery_cp != MaxSector &&
2151 printk(KERN_ERR "md: %s: raid array is not clean"
2152 " -- starting background reconstruction\n",
2158 safe_delay_show(mddev_t *mddev, char *page)
2160 int msec = (mddev->safemode_delay*1000)/HZ;
2161 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2164 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2172 /* remove a period, and count digits after it */
2173 if (len >= sizeof(buf))
2175 strlcpy(buf, cbuf, len);
2177 for (i=0; i<len; i++) {
2179 if (isdigit(buf[i])) {
2184 } else if (buf[i] == '.') {
2189 msec = simple_strtoul(buf, &e, 10);
2190 if (e == buf || (*e && *e != '\n'))
2192 msec = (msec * 1000) / scale;
2194 mddev->safemode_delay = 0;
2196 mddev->safemode_delay = (msec*HZ)/1000;
2197 if (mddev->safemode_delay == 0)
2198 mddev->safemode_delay = 1;
2202 static struct md_sysfs_entry md_safe_delay =
2203 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2206 level_show(mddev_t *mddev, char *page)
2208 struct mdk_personality *p = mddev->pers;
2210 return sprintf(page, "%s\n", p->name);
2211 else if (mddev->clevel[0])
2212 return sprintf(page, "%s\n", mddev->clevel);
2213 else if (mddev->level != LEVEL_NONE)
2214 return sprintf(page, "%d\n", mddev->level);
2220 level_store(mddev_t *mddev, const char *buf, size_t len)
2227 if (len >= sizeof(mddev->clevel))
2229 strncpy(mddev->clevel, buf, len);
2230 if (mddev->clevel[len-1] == '\n')
2232 mddev->clevel[len] = 0;
2233 mddev->level = LEVEL_NONE;
2237 static struct md_sysfs_entry md_level =
2238 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2242 layout_show(mddev_t *mddev, char *page)
2244 /* just a number, not meaningful for all levels */
2245 return sprintf(page, "%d\n", mddev->layout);
2249 layout_store(mddev_t *mddev, const char *buf, size_t len)
2252 unsigned long n = simple_strtoul(buf, &e, 10);
2256 if (!*buf || (*e && *e != '\n'))
2262 static struct md_sysfs_entry md_layout =
2263 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2267 raid_disks_show(mddev_t *mddev, char *page)
2269 if (mddev->raid_disks == 0)
2271 return sprintf(page, "%d\n", mddev->raid_disks);
2274 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2277 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2281 unsigned long n = simple_strtoul(buf, &e, 10);
2283 if (!*buf || (*e && *e != '\n'))
2287 rv = update_raid_disks(mddev, n);
2289 mddev->raid_disks = n;
2290 return rv ? rv : len;
2292 static struct md_sysfs_entry md_raid_disks =
2293 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2296 chunk_size_show(mddev_t *mddev, char *page)
2298 return sprintf(page, "%d\n", mddev->chunk_size);
2302 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2304 /* can only set chunk_size if array is not yet active */
2306 unsigned long n = simple_strtoul(buf, &e, 10);
2310 if (!*buf || (*e && *e != '\n'))
2313 mddev->chunk_size = n;
2316 static struct md_sysfs_entry md_chunk_size =
2317 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2320 resync_start_show(mddev_t *mddev, char *page)
2322 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2326 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2328 /* can only set chunk_size if array is not yet active */
2330 unsigned long long n = simple_strtoull(buf, &e, 10);
2334 if (!*buf || (*e && *e != '\n'))
2337 mddev->recovery_cp = n;
2340 static struct md_sysfs_entry md_resync_start =
2341 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2344 * The array state can be:
2347 * No devices, no size, no level
2348 * Equivalent to STOP_ARRAY ioctl
2350 * May have some settings, but array is not active
2351 * all IO results in error
2352 * When written, doesn't tear down array, but just stops it
2353 * suspended (not supported yet)
2354 * All IO requests will block. The array can be reconfigured.
2355 * Writing this, if accepted, will block until array is quiessent
2357 * no resync can happen. no superblocks get written.
2358 * write requests fail
2360 * like readonly, but behaves like 'clean' on a write request.
2362 * clean - no pending writes, but otherwise active.
2363 * When written to inactive array, starts without resync
2364 * If a write request arrives then
2365 * if metadata is known, mark 'dirty' and switch to 'active'.
2366 * if not known, block and switch to write-pending
2367 * If written to an active array that has pending writes, then fails.
2369 * fully active: IO and resync can be happening.
2370 * When written to inactive array, starts with resync
2373 * clean, but writes are blocked waiting for 'active' to be written.
2376 * like active, but no writes have been seen for a while (100msec).
2379 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2380 write_pending, active_idle, bad_word};
2381 static char *array_states[] = {
2382 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2383 "write-pending", "active-idle", NULL };
2385 static int match_word(const char *word, char **list)
2388 for (n=0; list[n]; n++)
2389 if (cmd_match(word, list[n]))
2395 array_state_show(mddev_t *mddev, char *page)
2397 enum array_state st = inactive;
2410 else if (mddev->safemode)
2416 if (list_empty(&mddev->disks) &&
2417 mddev->raid_disks == 0 &&
2423 return sprintf(page, "%s\n", array_states[st]);
2426 static int do_md_stop(mddev_t * mddev, int ro);
2427 static int do_md_run(mddev_t * mddev);
2428 static int restart_array(mddev_t *mddev);
2431 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2434 enum array_state st = match_word(buf, array_states);
2439 /* stopping an active array */
2441 if (atomic_read(&mddev->active) > 1)
2443 err = do_md_stop(mddev, 0);
2447 /* stopping an active array */
2449 if (atomic_read(&mddev->active) > 1)
2451 err = do_md_stop(mddev, 2);
2455 break; /* not supported yet */
2458 err = do_md_stop(mddev, 1);
2461 err = do_md_run(mddev);
2465 /* stopping an active array */
2467 err = do_md_stop(mddev, 1);
2469 mddev->ro = 2; /* FIXME mark devices writable */
2472 err = do_md_run(mddev);
2477 restart_array(mddev);
2478 spin_lock_irq(&mddev->write_lock);
2479 if (atomic_read(&mddev->writes_pending) == 0) {
2481 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
2483 spin_unlock_irq(&mddev->write_lock);
2486 mddev->recovery_cp = MaxSector;
2487 err = do_md_run(mddev);
2492 restart_array(mddev);
2493 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2494 wake_up(&mddev->sb_wait);
2498 err = do_md_run(mddev);
2503 /* these cannot be set */
2511 static struct md_sysfs_entry md_array_state =
2512 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2515 null_show(mddev_t *mddev, char *page)
2521 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2523 /* buf must be %d:%d\n? giving major and minor numbers */
2524 /* The new device is added to the array.
2525 * If the array has a persistent superblock, we read the
2526 * superblock to initialise info and check validity.
2527 * Otherwise, only checking done is that in bind_rdev_to_array,
2528 * which mainly checks size.
2531 int major = simple_strtoul(buf, &e, 10);
2537 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2539 minor = simple_strtoul(e+1, &e, 10);
2540 if (*e && *e != '\n')
2542 dev = MKDEV(major, minor);
2543 if (major != MAJOR(dev) ||
2544 minor != MINOR(dev))
2548 if (mddev->persistent) {
2549 rdev = md_import_device(dev, mddev->major_version,
2550 mddev->minor_version);
2551 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2552 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2553 mdk_rdev_t, same_set);
2554 err = super_types[mddev->major_version]
2555 .load_super(rdev, rdev0, mddev->minor_version);
2560 rdev = md_import_device(dev, -1, -1);
2563 return PTR_ERR(rdev);
2564 err = bind_rdev_to_array(rdev, mddev);
2568 return err ? err : len;
2571 static struct md_sysfs_entry md_new_device =
2572 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2575 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2578 unsigned long chunk, end_chunk;
2582 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2584 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2585 if (buf == end) break;
2586 if (*end == '-') { /* range */
2588 end_chunk = simple_strtoul(buf, &end, 0);
2589 if (buf == end) break;
2591 if (*end && !isspace(*end)) break;
2592 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2594 while (isspace(*buf)) buf++;
2596 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2601 static struct md_sysfs_entry md_bitmap =
2602 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2605 size_show(mddev_t *mddev, char *page)
2607 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2610 static int update_size(mddev_t *mddev, unsigned long size);
2613 size_store(mddev_t *mddev, const char *buf, size_t len)
2615 /* If array is inactive, we can reduce the component size, but
2616 * not increase it (except from 0).
2617 * If array is active, we can try an on-line resize
2621 unsigned long long size = simple_strtoull(buf, &e, 10);
2622 if (!*buf || *buf == '\n' ||
2627 err = update_size(mddev, size);
2628 md_update_sb(mddev, 1);
2630 if (mddev->size == 0 ||
2636 return err ? err : len;
2639 static struct md_sysfs_entry md_size =
2640 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2644 * This is either 'none' for arrays with externally managed metadata,
2645 * or N.M for internally known formats
2648 metadata_show(mddev_t *mddev, char *page)
2650 if (mddev->persistent)
2651 return sprintf(page, "%d.%d\n",
2652 mddev->major_version, mddev->minor_version);
2654 return sprintf(page, "none\n");
2658 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2662 if (!list_empty(&mddev->disks))
2665 if (cmd_match(buf, "none")) {
2666 mddev->persistent = 0;
2667 mddev->major_version = 0;
2668 mddev->minor_version = 90;
2671 major = simple_strtoul(buf, &e, 10);
2672 if (e==buf || *e != '.')
2675 minor = simple_strtoul(buf, &e, 10);
2676 if (e==buf || (*e && *e != '\n') )
2678 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2680 mddev->major_version = major;
2681 mddev->minor_version = minor;
2682 mddev->persistent = 1;
2686 static struct md_sysfs_entry md_metadata =
2687 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2690 action_show(mddev_t *mddev, char *page)
2692 char *type = "idle";
2693 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2694 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2695 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2697 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2698 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2700 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2707 return sprintf(page, "%s\n", type);
2711 action_store(mddev_t *mddev, const char *page, size_t len)
2713 if (!mddev->pers || !mddev->pers->sync_request)
2716 if (cmd_match(page, "idle")) {
2717 if (mddev->sync_thread) {
2718 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2719 md_unregister_thread(mddev->sync_thread);
2720 mddev->sync_thread = NULL;
2721 mddev->recovery = 0;
2723 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2724 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2726 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2727 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2728 else if (cmd_match(page, "reshape")) {
2730 if (mddev->pers->start_reshape == NULL)
2732 err = mddev->pers->start_reshape(mddev);
2736 if (cmd_match(page, "check"))
2737 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2738 else if (!cmd_match(page, "repair"))
2740 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2741 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2743 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2744 md_wakeup_thread(mddev->thread);
2749 mismatch_cnt_show(mddev_t *mddev, char *page)
2751 return sprintf(page, "%llu\n",
2752 (unsigned long long) mddev->resync_mismatches);
2755 static struct md_sysfs_entry md_scan_mode =
2756 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2759 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
2762 sync_min_show(mddev_t *mddev, char *page)
2764 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2765 mddev->sync_speed_min ? "local": "system");
2769 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2773 if (strncmp(buf, "system", 6)==0) {
2774 mddev->sync_speed_min = 0;
2777 min = simple_strtoul(buf, &e, 10);
2778 if (buf == e || (*e && *e != '\n') || min <= 0)
2780 mddev->sync_speed_min = min;
2784 static struct md_sysfs_entry md_sync_min =
2785 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2788 sync_max_show(mddev_t *mddev, char *page)
2790 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2791 mddev->sync_speed_max ? "local": "system");
2795 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2799 if (strncmp(buf, "system", 6)==0) {
2800 mddev->sync_speed_max = 0;
2803 max = simple_strtoul(buf, &e, 10);
2804 if (buf == e || (*e && *e != '\n') || max <= 0)
2806 mddev->sync_speed_max = max;
2810 static struct md_sysfs_entry md_sync_max =
2811 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2815 sync_speed_show(mddev_t *mddev, char *page)
2817 unsigned long resync, dt, db;
2818 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
2819 dt = ((jiffies - mddev->resync_mark) / HZ);
2821 db = resync - (mddev->resync_mark_cnt);
2822 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2825 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
2828 sync_completed_show(mddev_t *mddev, char *page)
2830 unsigned long max_blocks, resync;
2832 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2833 max_blocks = mddev->resync_max_sectors;
2835 max_blocks = mddev->size << 1;
2837 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2838 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2841 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
2844 suspend_lo_show(mddev_t *mddev, char *page)
2846 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2850 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2853 unsigned long long new = simple_strtoull(buf, &e, 10);
2855 if (mddev->pers->quiesce == NULL)
2857 if (buf == e || (*e && *e != '\n'))
2859 if (new >= mddev->suspend_hi ||
2860 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2861 mddev->suspend_lo = new;
2862 mddev->pers->quiesce(mddev, 2);
2867 static struct md_sysfs_entry md_suspend_lo =
2868 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2872 suspend_hi_show(mddev_t *mddev, char *page)
2874 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2878 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2881 unsigned long long new = simple_strtoull(buf, &e, 10);
2883 if (mddev->pers->quiesce == NULL)
2885 if (buf == e || (*e && *e != '\n'))
2887 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2888 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2889 mddev->suspend_hi = new;
2890 mddev->pers->quiesce(mddev, 1);
2891 mddev->pers->quiesce(mddev, 0);
2896 static struct md_sysfs_entry md_suspend_hi =
2897 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2900 static struct attribute *md_default_attrs[] = {
2903 &md_raid_disks.attr,
2904 &md_chunk_size.attr,
2906 &md_resync_start.attr,
2908 &md_new_device.attr,
2909 &md_safe_delay.attr,
2910 &md_array_state.attr,
2914 static struct attribute *md_redundancy_attrs[] = {
2916 &md_mismatches.attr,
2919 &md_sync_speed.attr,
2920 &md_sync_completed.attr,
2921 &md_suspend_lo.attr,
2922 &md_suspend_hi.attr,
2926 static struct attribute_group md_redundancy_group = {
2928 .attrs = md_redundancy_attrs,
2933 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2935 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2936 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2941 rv = mddev_lock(mddev);
2943 rv = entry->show(mddev, page);
2944 mddev_unlock(mddev);
2950 md_attr_store(struct kobject *kobj, struct attribute *attr,
2951 const char *page, size_t length)
2953 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2954 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2959 if (!capable(CAP_SYS_ADMIN))
2961 rv = mddev_lock(mddev);
2963 rv = entry->store(mddev, page, length);
2964 mddev_unlock(mddev);
2969 static void md_free(struct kobject *ko)
2971 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2975 static struct sysfs_ops md_sysfs_ops = {
2976 .show = md_attr_show,
2977 .store = md_attr_store,
2979 static struct kobj_type md_ktype = {
2981 .sysfs_ops = &md_sysfs_ops,
2982 .default_attrs = md_default_attrs,
2987 static struct kobject *md_probe(dev_t dev, int *part, void *data)
2989 static DEFINE_MUTEX(disks_mutex);
2990 mddev_t *mddev = mddev_find(dev);
2991 struct gendisk *disk;
2992 int partitioned = (MAJOR(dev) != MD_MAJOR);
2993 int shift = partitioned ? MdpMinorShift : 0;
2994 int unit = MINOR(dev) >> shift;
2999 mutex_lock(&disks_mutex);
3000 if (mddev->gendisk) {
3001 mutex_unlock(&disks_mutex);
3005 disk = alloc_disk(1 << shift);
3007 mutex_unlock(&disks_mutex);
3011 disk->major = MAJOR(dev);
3012 disk->first_minor = unit << shift;
3014 sprintf(disk->disk_name, "md_d%d", unit);
3016 sprintf(disk->disk_name, "md%d", unit);
3017 disk->fops = &md_fops;
3018 disk->private_data = mddev;
3019 disk->queue = mddev->queue;
3021 mddev->gendisk = disk;
3022 mutex_unlock(&disks_mutex);
3023 mddev->kobj.parent = &disk->kobj;
3024 mddev->kobj.k_name = NULL;
3025 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
3026 mddev->kobj.ktype = &md_ktype;
3027 if (kobject_register(&mddev->kobj))
3028 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3033 static void md_safemode_timeout(unsigned long data)
3035 mddev_t *mddev = (mddev_t *) data;
3037 mddev->safemode = 1;
3038 md_wakeup_thread(mddev->thread);
3041 static int start_dirty_degraded;
3043 static int do_md_run(mddev_t * mddev)
3047 struct list_head *tmp;
3049 struct gendisk *disk;
3050 struct mdk_personality *pers;
3051 char b[BDEVNAME_SIZE];
3053 if (list_empty(&mddev->disks))
3054 /* cannot run an array with no devices.. */
3061 * Analyze all RAID superblock(s)
3063 if (!mddev->raid_disks)
3066 chunk_size = mddev->chunk_size;
3069 if (chunk_size > MAX_CHUNK_SIZE) {
3070 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3071 chunk_size, MAX_CHUNK_SIZE);
3075 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3077 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3078 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3081 if (chunk_size < PAGE_SIZE) {
3082 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3083 chunk_size, PAGE_SIZE);
3087 /* devices must have minimum size of one chunk */
3088 ITERATE_RDEV(mddev,rdev,tmp) {
3089 if (test_bit(Faulty, &rdev->flags))
3091 if (rdev->size < chunk_size / 1024) {
3093 "md: Dev %s smaller than chunk_size:"
3095 bdevname(rdev->bdev,b),
3096 (unsigned long long)rdev->size,
3104 if (mddev->level != LEVEL_NONE)
3105 request_module("md-level-%d", mddev->level);
3106 else if (mddev->clevel[0])
3107 request_module("md-%s", mddev->clevel);
3111 * Drop all container device buffers, from now on
3112 * the only valid external interface is through the md
3114 * Also find largest hardsector size
3116 ITERATE_RDEV(mddev,rdev,tmp) {
3117 if (test_bit(Faulty, &rdev->flags))
3119 sync_blockdev(rdev->bdev);
3120 invalidate_bdev(rdev->bdev);
3123 md_probe(mddev->unit, NULL, NULL);
3124 disk = mddev->gendisk;
3128 spin_lock(&pers_lock);
3129 pers = find_pers(mddev->level, mddev->clevel);
3130 if (!pers || !try_module_get(pers->owner)) {
3131 spin_unlock(&pers_lock);
3132 if (mddev->level != LEVEL_NONE)
3133 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3136 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3141 spin_unlock(&pers_lock);
3142 mddev->level = pers->level;
3143 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3145 if (mddev->reshape_position != MaxSector &&
3146 pers->start_reshape == NULL) {
3147 /* This personality cannot handle reshaping... */
3149 module_put(pers->owner);
3153 if (pers->sync_request) {
3154 /* Warn if this is a potentially silly
3157 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3159 struct list_head *tmp2;
3161 ITERATE_RDEV(mddev, rdev, tmp) {
3162 ITERATE_RDEV(mddev, rdev2, tmp2) {
3164 rdev->bdev->bd_contains ==
3165 rdev2->bdev->bd_contains) {
3167 "%s: WARNING: %s appears to be"
3168 " on the same physical disk as"
3171 bdevname(rdev->bdev,b),
3172 bdevname(rdev2->bdev,b2));
3179 "True protection against single-disk"
3180 " failure might be compromised.\n");
3183 mddev->recovery = 0;
3184 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3185 mddev->barriers_work = 1;
3186 mddev->ok_start_degraded = start_dirty_degraded;
3189 mddev->ro = 2; /* read-only, but switch on first write */
3191 err = mddev->pers->run(mddev);
3192 if (!err && mddev->pers->sync_request) {
3193 err = bitmap_create(mddev);
3195 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3196 mdname(mddev), err);
3197 mddev->pers->stop(mddev);
3201 printk(KERN_ERR "md: pers->run() failed ...\n");
3202 module_put(mddev->pers->owner);
3204 bitmap_destroy(mddev);
3207 if (mddev->pers->sync_request) {
3208 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3210 "md: cannot register extra attributes for %s\n",
3212 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3215 atomic_set(&mddev->writes_pending,0);
3216 mddev->safemode = 0;
3217 mddev->safemode_timer.function = md_safemode_timeout;
3218 mddev->safemode_timer.data = (unsigned long) mddev;
3219 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3222 ITERATE_RDEV(mddev,rdev,tmp)
3223 if (rdev->raid_disk >= 0) {
3225 sprintf(nm, "rd%d", rdev->raid_disk);
3226 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3227 printk("md: cannot register %s for %s\n",
3231 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3234 md_update_sb(mddev, 0);
3236 set_capacity(disk, mddev->array_size<<1);
3238 /* If we call blk_queue_make_request here, it will
3239 * re-initialise max_sectors etc which may have been
3240 * refined inside -> run. So just set the bits we need to set.
3241 * Most initialisation happended when we called
3242 * blk_queue_make_request(..., md_fail_request)
3245 mddev->queue->queuedata = mddev;
3246 mddev->queue->make_request_fn = mddev->pers->make_request;
3248 /* If there is a partially-recovered drive we need to
3249 * start recovery here. If we leave it to md_check_recovery,
3250 * it will remove the drives and not do the right thing
3252 if (mddev->degraded && !mddev->sync_thread) {
3253 struct list_head *rtmp;
3255 ITERATE_RDEV(mddev,rdev,rtmp)
3256 if (rdev->raid_disk >= 0 &&
3257 !test_bit(In_sync, &rdev->flags) &&
3258 !test_bit(Faulty, &rdev->flags))
3259 /* complete an interrupted recovery */
3261 if (spares && mddev->pers->sync_request) {
3262 mddev->recovery = 0;
3263 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3264 mddev->sync_thread = md_register_thread(md_do_sync,
3267 if (!mddev->sync_thread) {
3268 printk(KERN_ERR "%s: could not start resync"
3271 /* leave the spares where they are, it shouldn't hurt */
3272 mddev->recovery = 0;
3276 md_wakeup_thread(mddev->thread);
3277 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3280 md_new_event(mddev);
3281 kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE);
3285 static int restart_array(mddev_t *mddev)
3287 struct gendisk *disk = mddev->gendisk;
3291 * Complain if it has no devices
3294 if (list_empty(&mddev->disks))
3302 mddev->safemode = 0;
3304 set_disk_ro(disk, 0);
3306 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3309 * Kick recovery or resync if necessary
3311 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3312 md_wakeup_thread(mddev->thread);
3313 md_wakeup_thread(mddev->sync_thread);
3322 /* similar to deny_write_access, but accounts for our holding a reference
3323 * to the file ourselves */
3324 static int deny_bitmap_write_access(struct file * file)
3326 struct inode *inode = file->f_mapping->host;
3328 spin_lock(&inode->i_lock);
3329 if (atomic_read(&inode->i_writecount) > 1) {
3330 spin_unlock(&inode->i_lock);
3333 atomic_set(&inode->i_writecount, -1);
3334 spin_unlock(&inode->i_lock);
3339 static void restore_bitmap_write_access(struct file *file)
3341 struct inode *inode = file->f_mapping->host;
3343 spin_lock(&inode->i_lock);
3344 atomic_set(&inode->i_writecount, 1);
3345 spin_unlock(&inode->i_lock);
3349 * 0 - completely stop and dis-assemble array
3350 * 1 - switch to readonly
3351 * 2 - stop but do not disassemble array
3353 static int do_md_stop(mddev_t * mddev, int mode)
3356 struct gendisk *disk = mddev->gendisk;
3359 if (atomic_read(&mddev->active)>2) {
3360 printk("md: %s still in use.\n",mdname(mddev));
3364 if (mddev->sync_thread) {
3365 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3366 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3367 md_unregister_thread(mddev->sync_thread);
3368 mddev->sync_thread = NULL;
3371 del_timer_sync(&mddev->safemode_timer);
3373 invalidate_partition(disk, 0);
3376 case 1: /* readonly */
3382 case 0: /* disassemble */
3384 bitmap_flush(mddev);
3385 md_super_wait(mddev);
3387 set_disk_ro(disk, 0);
3388 blk_queue_make_request(mddev->queue, md_fail_request);
3389 mddev->pers->stop(mddev);
3390 mddev->queue->merge_bvec_fn = NULL;
3391 mddev->queue->unplug_fn = NULL;
3392 mddev->queue->issue_flush_fn = NULL;
3393 mddev->queue->backing_dev_info.congested_fn = NULL;
3394 if (mddev->pers->sync_request)
3395 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3397 module_put(mddev->pers->owner);
3400 set_capacity(disk, 0);
3406 if (!mddev->in_sync || mddev->flags) {
3407 /* mark array as shutdown cleanly */
3409 md_update_sb(mddev, 1);
3412 set_disk_ro(disk, 1);
3413 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3417 * Free resources if final stop
3421 struct list_head *tmp;
3423 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3425 bitmap_destroy(mddev);
3426 if (mddev->bitmap_file) {
3427 restore_bitmap_write_access(mddev->bitmap_file);
3428 fput(mddev->bitmap_file);
3429 mddev->bitmap_file = NULL;
3431 mddev->bitmap_offset = 0;
3433 ITERATE_RDEV(mddev,rdev,tmp)
3434 if (rdev->raid_disk >= 0) {
3436 sprintf(nm, "rd%d", rdev->raid_disk);
3437 sysfs_remove_link(&mddev->kobj, nm);
3440 /* make sure all delayed_delete calls have finished */
3441 flush_scheduled_work();
3443 export_array(mddev);
3445 mddev->array_size = 0;
3447 mddev->raid_disks = 0;
3448 mddev->recovery_cp = 0;
3450 } else if (mddev->pers)
3451 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3454 md_new_event(mddev);
3460 static void autorun_array(mddev_t *mddev)
3463 struct list_head *tmp;
3466 if (list_empty(&mddev->disks))
3469 printk(KERN_INFO "md: running: ");
3471 ITERATE_RDEV(mddev,rdev,tmp) {
3472 char b[BDEVNAME_SIZE];
3473 printk("<%s>", bdevname(rdev->bdev,b));
3477 err = do_md_run (mddev);
3479 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3480 do_md_stop (mddev, 0);
3485 * lets try to run arrays based on all disks that have arrived
3486 * until now. (those are in pending_raid_disks)
3488 * the method: pick the first pending disk, collect all disks with
3489 * the same UUID, remove all from the pending list and put them into
3490 * the 'same_array' list. Then order this list based on superblock
3491 * update time (freshest comes first), kick out 'old' disks and
3492 * compare superblocks. If everything's fine then run it.
3494 * If "unit" is allocated, then bump its reference count
3496 static void autorun_devices(int part)
3498 struct list_head *tmp;
3499 mdk_rdev_t *rdev0, *rdev;
3501 char b[BDEVNAME_SIZE];
3503 printk(KERN_INFO "md: autorun ...\n");
3504 while (!list_empty(&pending_raid_disks)) {
3507 LIST_HEAD(candidates);
3508 rdev0 = list_entry(pending_raid_disks.next,
3509 mdk_rdev_t, same_set);
3511 printk(KERN_INFO "md: considering %s ...\n",
3512 bdevname(rdev0->bdev,b));
3513 INIT_LIST_HEAD(&candidates);
3514 ITERATE_RDEV_PENDING(rdev,tmp)
3515 if (super_90_load(rdev, rdev0, 0) >= 0) {
3516 printk(KERN_INFO "md: adding %s ...\n",
3517 bdevname(rdev->bdev,b));
3518 list_move(&rdev->same_set, &candidates);
3521 * now we have a set of devices, with all of them having
3522 * mostly sane superblocks. It's time to allocate the
3526 dev = MKDEV(mdp_major,
3527 rdev0->preferred_minor << MdpMinorShift);
3528 unit = MINOR(dev) >> MdpMinorShift;
3530 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3533 if (rdev0->preferred_minor != unit) {
3534 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3535 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3539 md_probe(dev, NULL, NULL);
3540 mddev = mddev_find(dev);
3543 "md: cannot allocate memory for md drive.\n");
3546 if (mddev_lock(mddev))
3547 printk(KERN_WARNING "md: %s locked, cannot run\n",
3549 else if (mddev->raid_disks || mddev->major_version
3550 || !list_empty(&mddev->disks)) {
3552 "md: %s already running, cannot run %s\n",
3553 mdname(mddev), bdevname(rdev0->bdev,b));
3554 mddev_unlock(mddev);
3556 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3557 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3558 list_del_init(&rdev->same_set);
3559 if (bind_rdev_to_array(rdev, mddev))
3562 autorun_array(mddev);
3563 mddev_unlock(mddev);
3565 /* on success, candidates will be empty, on error
3568 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3572 printk(KERN_INFO "md: ... autorun DONE.\n");
3574 #endif /* !MODULE */
3576 static int get_version(void __user * arg)
3580 ver.major = MD_MAJOR_VERSION;
3581 ver.minor = MD_MINOR_VERSION;
3582 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3584 if (copy_to_user(arg, &ver, sizeof(ver)))
3590 static int get_array_info(mddev_t * mddev, void __user * arg)
3592 mdu_array_info_t info;
3593 int nr,working,active,failed,spare;
3595 struct list_head *tmp;
3597 nr=working=active=failed=spare=0;
3598 ITERATE_RDEV(mddev,rdev,tmp) {
3600 if (test_bit(Faulty, &rdev->flags))
3604 if (test_bit(In_sync, &rdev->flags))
3611 info.major_version = mddev->major_version;
3612 info.minor_version = mddev->minor_version;
3613 info.patch_version = MD_PATCHLEVEL_VERSION;
3614 info.ctime = mddev->ctime;
3615 info.level = mddev->level;
3616 info.size = mddev->size;
3617 if (info.size != mddev->size) /* overflow */
3620 info.raid_disks = mddev->raid_disks;
3621 info.md_minor = mddev->md_minor;
3622 info.not_persistent= !mddev->persistent;
3624 info.utime = mddev->utime;
3627 info.state = (1<<MD_SB_CLEAN);
3628 if (mddev->bitmap && mddev->bitmap_offset)
3629 info.state = (1<<MD_SB_BITMAP_PRESENT);
3630 info.active_disks = active;
3631 info.working_disks = working;
3632 info.failed_disks = failed;
3633 info.spare_disks = spare;
3635 info.layout = mddev->layout;
3636 info.chunk_size = mddev->chunk_size;
3638 if (copy_to_user(arg, &info, sizeof(info)))
3644 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
3646 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3647 char *ptr, *buf = NULL;
3650 md_allow_write(mddev);
3652 file = kmalloc(sizeof(*file), GFP_KERNEL);
3656 /* bitmap disabled, zero the first byte and copy out */
3657 if (!mddev->bitmap || !mddev->bitmap->file) {
3658 file->pathname[0] = '\0';
3662 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3666 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3670 strcpy(file->pathname, ptr);
3674 if (copy_to_user(arg, file, sizeof(*file)))
3682 static int get_disk_info(mddev_t * mddev, void __user * arg)
3684 mdu_disk_info_t info;
3688 if (copy_from_user(&info, arg, sizeof(info)))
3693 rdev = find_rdev_nr(mddev, nr);
3695 info.major = MAJOR(rdev->bdev->bd_dev);
3696 info.minor = MINOR(rdev->bdev->bd_dev);
3697 info.raid_disk = rdev->raid_disk;
3699 if (test_bit(Faulty, &rdev->flags))
3700 info.state |= (1<<MD_DISK_FAULTY);
3701 else if (test_bit(In_sync, &rdev->flags)) {
3702 info.state |= (1<<MD_DISK_ACTIVE);
3703 info.state |= (1<<MD_DISK_SYNC);
3705 if (test_bit(WriteMostly, &rdev->flags))
3706 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3708 info.major = info.minor = 0;
3709 info.raid_disk = -1;
3710 info.state = (1<<MD_DISK_REMOVED);
3713 if (copy_to_user(arg, &info, sizeof(info)))
3719 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3721 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3723 dev_t dev = MKDEV(info->major,info->minor);
3725 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3728 if (!mddev->raid_disks) {
3730 /* expecting a device which has a superblock */
3731 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3734 "md: md_import_device returned %ld\n",
3736 return PTR_ERR(rdev);
3738 if (!list_empty(&mddev->disks)) {
3739 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3740 mdk_rdev_t, same_set);
3741 int err = super_types[mddev->major_version]
3742 .load_super(rdev, rdev0, mddev->minor_version);
3745 "md: %s has different UUID to %s\n",
3746 bdevname(rdev->bdev,b),
3747 bdevname(rdev0->bdev,b2));
3752 err = bind_rdev_to_array(rdev, mddev);
3759 * add_new_disk can be used once the array is assembled
3760 * to add "hot spares". They must already have a superblock
3765 if (!mddev->pers->hot_add_disk) {
3767 "%s: personality does not support diskops!\n",
3771 if (mddev->persistent)
3772 rdev = md_import_device(dev, mddev->major_version,
3773 mddev->minor_version);
3775 rdev = md_import_device(dev, -1, -1);
3778 "md: md_import_device returned %ld\n",
3780 return PTR_ERR(rdev);
3782 /* set save_raid_disk if appropriate */
3783 if (!mddev->persistent) {
3784 if (info->state & (1<<MD_DISK_SYNC) &&
3785 info->raid_disk < mddev->raid_disks)
3786 rdev->raid_disk = info->raid_disk;
3788 rdev->raid_disk = -1;
3790 super_types[mddev->major_version].
3791 validate_super(mddev, rdev);
3792 rdev->saved_raid_disk = rdev->raid_disk;
3794 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3795 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3796 set_bit(WriteMostly, &rdev->flags);
3798 rdev->raid_disk = -1;
3799 err = bind_rdev_to_array(rdev, mddev);
3800 if (!err && !mddev->pers->hot_remove_disk) {
3801 /* If there is hot_add_disk but no hot_remove_disk
3802 * then added disks for geometry changes,
3803 * and should be added immediately.
3805 super_types[mddev->major_version].
3806 validate_super(mddev, rdev);
3807 err = mddev->pers->hot_add_disk(mddev, rdev);
3809 unbind_rdev_from_array(rdev);
3814 md_update_sb(mddev, 1);
3815 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3816 md_wakeup_thread(mddev->thread);
3820 /* otherwise, add_new_disk is only allowed
3821 * for major_version==0 superblocks
3823 if (mddev->major_version != 0) {
3824 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3829 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3831 rdev = md_import_device (dev, -1, 0);
3834 "md: error, md_import_device() returned %ld\n",
3836 return PTR_ERR(rdev);
3838 rdev->desc_nr = info->number;
3839 if (info->raid_disk < mddev->raid_disks)
3840 rdev->raid_disk = info->raid_disk;
3842 rdev->raid_disk = -1;
3846 if (rdev->raid_disk < mddev->raid_disks)
3847 if (info->state & (1<<MD_DISK_SYNC))
3848 set_bit(In_sync, &rdev->flags);
3850 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3851 set_bit(WriteMostly, &rdev->flags);
3853 if (!mddev->persistent) {
3854 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3855 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3857 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3858 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3860 err = bind_rdev_to_array(rdev, mddev);
3870 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3872 char b[BDEVNAME_SIZE];
3878 rdev = find_rdev(mddev, dev);
3882 if (rdev->raid_disk >= 0)
3885 kick_rdev_from_array(rdev);
3886 md_update_sb(mddev, 1);
3887 md_new_event(mddev);
3891 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3892 bdevname(rdev->bdev,b), mdname(mddev));
3896 static int hot_add_disk(mddev_t * mddev, dev_t dev)
3898 char b[BDEVNAME_SIZE];
3906 if (mddev->major_version != 0) {
3907 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3908 " version-0 superblocks.\n",
3912 if (!mddev->pers->hot_add_disk) {
3914 "%s: personality does not support diskops!\n",
3919 rdev = md_import_device (dev, -1, 0);
3922 "md: error, md_import_device() returned %ld\n",
3927 if (mddev->persistent)
3928 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3931 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3933 size = calc_dev_size(rdev, mddev->chunk_size);
3936 if (test_bit(Faulty, &rdev->flags)) {
3938 "md: can not hot-add faulty %s disk to %s!\n",
3939 bdevname(rdev->bdev,b), mdname(mddev));
3943 clear_bit(In_sync, &rdev->flags);
3945 rdev->saved_raid_disk = -1;
3946 err = bind_rdev_to_array(rdev, mddev);
3951 * The rest should better be atomic, we can have disk failures
3952 * noticed in interrupt contexts ...
3955 if (rdev->desc_nr == mddev->max_disks) {
3956 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3959 goto abort_unbind_export;
3962 rdev->raid_disk = -1;
3964 md_update_sb(mddev, 1);
3967 * Kick recovery, maybe this spare has to be added to the
3968 * array immediately.
3970 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3971 md_wakeup_thread(mddev->thread);
3972 md_new_event(mddev);
3975 abort_unbind_export:
3976 unbind_rdev_from_array(rdev);
3983 static int set_bitmap_file(mddev_t *mddev, int fd)
3988 if (!mddev->pers->quiesce)
3990 if (mddev->recovery || mddev->sync_thread)
3992 /* we should be able to change the bitmap.. */
3998 return -EEXIST; /* cannot add when bitmap is present */
3999 mddev->bitmap_file = fget(fd);
4001 if (mddev->bitmap_file == NULL) {
4002 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4007 err = deny_bitmap_write_access(mddev->bitmap_file);
4009 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4011 fput(mddev->bitmap_file);
4012 mddev->bitmap_file = NULL;
4015 mddev->bitmap_offset = 0; /* file overrides offset */
4016 } else if (mddev->bitmap == NULL)
4017 return -ENOENT; /* cannot remove what isn't there */
4020 mddev->pers->quiesce(mddev, 1);
4022 err = bitmap_create(mddev);
4023 if (fd < 0 || err) {
4024 bitmap_destroy(mddev);
4025 fd = -1; /* make sure to put the file */
4027 mddev->pers->quiesce(mddev, 0);
4030 if (mddev->bitmap_file) {
4031 restore_bitmap_write_access(mddev->bitmap_file);
4032 fput(mddev->bitmap_file);
4034 mddev->bitmap_file = NULL;
4041 * set_array_info is used two different ways
4042 * The original usage is when creating a new array.
4043 * In this usage, raid_disks is > 0 and it together with
4044 * level, size, not_persistent,layout,chunksize determine the
4045 * shape of the array.
4046 * This will always create an array with a type-0.90.0 superblock.
4047 * The newer usage is when assembling an array.
4048 * In this case raid_disks will be 0, and the major_version field is
4049 * use to determine which style super-blocks are to be found on the devices.
4050 * The minor and patch _version numbers are also kept incase the
4051 * super_block handler wishes to interpret them.
4053 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4056 if (info->raid_disks == 0) {
4057 /* just setting version number for superblock loading */
4058 if (info->major_version < 0 ||
4059 info->major_version >= ARRAY_SIZE(super_types) ||
4060 super_types[info->major_version].name == NULL) {
4061 /* maybe try to auto-load a module? */
4063 "md: superblock version %d not known\n",
4064 info->major_version);
4067 mddev->major_version = info->major_version;
4068 mddev->minor_version = info->minor_version;
4069 mddev->patch_version = info->patch_version;
4070 mddev->persistent = !info->not_persistent;
4073 mddev->major_version = MD_MAJOR_VERSION;
4074 mddev->minor_version = MD_MINOR_VERSION;
4075 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4076 mddev->ctime = get_seconds();
4078 mddev->level = info->level;
4079 mddev->clevel[0] = 0;
4080 mddev->size = info->size;
4081 mddev->raid_disks = info->raid_disks;
4082 /* don't set md_minor, it is determined by which /dev/md* was
4085 if (info->state & (1<<MD_SB_CLEAN))
4086 mddev->recovery_cp = MaxSector;
4088 mddev->recovery_cp = 0;
4089 mddev->persistent = ! info->not_persistent;
4091 mddev->layout = info->layout;
4092 mddev->chunk_size = info->chunk_size;
4094 mddev->max_disks = MD_SB_DISKS;
4097 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4099 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4100 mddev->bitmap_offset = 0;
4102 mddev->reshape_position = MaxSector;
4105 * Generate a 128 bit UUID
4107 get_random_bytes(mddev->uuid, 16);
4109 mddev->new_level = mddev->level;
4110 mddev->new_chunk = mddev->chunk_size;
4111 mddev->new_layout = mddev->layout;
4112 mddev->delta_disks = 0;
4117 static int update_size(mddev_t *mddev, unsigned long size)
4121 struct list_head *tmp;
4122 int fit = (size == 0);
4124 if (mddev->pers->resize == NULL)
4126 /* The "size" is the amount of each device that is used.
4127 * This can only make sense for arrays with redundancy.
4128 * linear and raid0 always use whatever space is available
4129 * We can only consider changing the size if no resync
4130 * or reconstruction is happening, and if the new size
4131 * is acceptable. It must fit before the sb_offset or,
4132 * if that is <data_offset, it must fit before the
4133 * size of each device.
4134 * If size is zero, we find the largest size that fits.
4136 if (mddev->sync_thread)
4138 ITERATE_RDEV(mddev,rdev,tmp) {
4140 avail = rdev->size * 2;
4142 if (fit && (size == 0 || size > avail/2))
4144 if (avail < ((sector_t)size << 1))
4147 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4149 struct block_device *bdev;
4151 bdev = bdget_disk(mddev->gendisk, 0);
4153 mutex_lock(&bdev->bd_inode->i_mutex);
4154 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
4155 mutex_unlock(&bdev->bd_inode->i_mutex);
4162 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4165 /* change the number of raid disks */
4166 if (mddev->pers->check_reshape == NULL)
4168 if (raid_disks <= 0 ||
4169 raid_disks >= mddev->max_disks)
4171 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4173 mddev->delta_disks = raid_disks - mddev->raid_disks;
4175 rv = mddev->pers->check_reshape(mddev);
4181 * update_array_info is used to change the configuration of an
4183 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4184 * fields in the info are checked against the array.
4185 * Any differences that cannot be handled will cause an error.
4186 * Normally, only one change can be managed at a time.
4188 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4194 /* calculate expected state,ignoring low bits */
4195 if (mddev->bitmap && mddev->bitmap_offset)
4196 state |= (1 << MD_SB_BITMAP_PRESENT);
4198 if (mddev->major_version != info->major_version ||
4199 mddev->minor_version != info->minor_version ||
4200 /* mddev->patch_version != info->patch_version || */
4201 mddev->ctime != info->ctime ||
4202 mddev->level != info->level ||
4203 /* mddev->layout != info->layout || */
4204 !mddev->persistent != info->not_persistent||
4205 mddev->chunk_size != info->chunk_size ||
4206 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4207 ((state^info->state) & 0xfffffe00)
4210 /* Check there is only one change */
4211 if (info->size >= 0 && mddev->size != info->size) cnt++;
4212 if (mddev->raid_disks != info->raid_disks) cnt++;
4213 if (mddev->layout != info->layout) cnt++;
4214 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4215 if (cnt == 0) return 0;
4216 if (cnt > 1) return -EINVAL;
4218 if (mddev->layout != info->layout) {
4220 * we don't need to do anything at the md level, the
4221 * personality will take care of it all.
4223 if (mddev->pers->reconfig == NULL)
4226 return mddev->pers->reconfig(mddev, info->layout, -1);
4228 if (info->size >= 0 && mddev->size != info->size)
4229 rv = update_size(mddev, info->size);
4231 if (mddev->raid_disks != info->raid_disks)
4232 rv = update_raid_disks(mddev, info->raid_disks);
4234 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4235 if (mddev->pers->quiesce == NULL)
4237 if (mddev->recovery || mddev->sync_thread)
4239 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4240 /* add the bitmap */
4243 if (mddev->default_bitmap_offset == 0)
4245 mddev->bitmap_offset = mddev->default_bitmap_offset;
4246 mddev->pers->quiesce(mddev, 1);
4247 rv = bitmap_create(mddev);
4249 bitmap_destroy(mddev);
4250 mddev->pers->quiesce(mddev, 0);
4252 /* remove the bitmap */
4255 if (mddev->bitmap->file)
4257 mddev->pers->quiesce(mddev, 1);
4258 bitmap_destroy(mddev);
4259 mddev->pers->quiesce(mddev, 0);
4260 mddev->bitmap_offset = 0;
4263 md_update_sb(mddev, 1);
4267 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4271 if (mddev->pers == NULL)
4274 rdev = find_rdev(mddev, dev);
4278 md_error(mddev, rdev);
4282 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4284 mddev_t *mddev = bdev->bd_disk->private_data;
4288 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4292 static int md_ioctl(struct inode *inode, struct file *file,
4293 unsigned int cmd, unsigned long arg)
4296 void __user *argp = (void __user *)arg;
4297 mddev_t *mddev = NULL;
4299 if (!capable(CAP_SYS_ADMIN))
4303 * Commands dealing with the RAID driver but not any
4309 err = get_version(argp);
4312 case PRINT_RAID_DEBUG:
4320 autostart_arrays(arg);
4327 * Commands creating/starting a new array:
4330 mddev = inode->i_bdev->bd_disk->private_data;
4337 err = mddev_lock(mddev);
4340 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4347 case SET_ARRAY_INFO:
4349 mdu_array_info_t info;
4351 memset(&info, 0, sizeof(info));
4352 else if (copy_from_user(&info, argp, sizeof(info))) {
4357 err = update_array_info(mddev, &info);
4359 printk(KERN_WARNING "md: couldn't update"
4360 " array info. %d\n", err);
4365 if (!list_empty(&mddev->disks)) {
4367 "md: array %s already has disks!\n",
4372 if (mddev->raid_disks) {
4374 "md: array %s already initialised!\n",
4379 err = set_array_info(mddev, &info);
4381 printk(KERN_WARNING "md: couldn't set"
4382 " array info. %d\n", err);
4392 * Commands querying/configuring an existing array:
4394 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4395 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4396 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4397 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4398 && cmd != GET_BITMAP_FILE) {
4404 * Commands even a read-only array can execute:
4408 case GET_ARRAY_INFO:
4409 err = get_array_info(mddev, argp);
4412 case GET_BITMAP_FILE:
4413 err = get_bitmap_file(mddev, argp);
4417 err = get_disk_info(mddev, argp);
4420 case RESTART_ARRAY_RW:
4421 err = restart_array(mddev);
4425 err = do_md_stop (mddev, 0);
4429 err = do_md_stop (mddev, 1);
4433 * We have a problem here : there is no easy way to give a CHS
4434 * virtual geometry. We currently pretend that we have a 2 heads
4435 * 4 sectors (with a BIG number of cylinders...). This drives
4436 * dosfs just mad... ;-)
4441 * The remaining ioctls are changing the state of the
4442 * superblock, so we do not allow them on read-only arrays.
4443 * However non-MD ioctls (e.g. get-size) will still come through
4444 * here and hit the 'default' below, so only disallow
4445 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4447 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4448 mddev->ro && mddev->pers) {
4449 if (mddev->ro == 2) {
4451 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4452 md_wakeup_thread(mddev->thread);
4464 mdu_disk_info_t info;
4465 if (copy_from_user(&info, argp, sizeof(info)))
4468 err = add_new_disk(mddev, &info);
4472 case HOT_REMOVE_DISK:
4473 err = hot_remove_disk(mddev, new_decode_dev(arg));
4477 err = hot_add_disk(mddev, new_decode_dev(arg));
4480 case SET_DISK_FAULTY:
4481 err = set_disk_faulty(mddev, new_decode_dev(arg));
4485 err = do_md_run (mddev);
4488 case SET_BITMAP_FILE:
4489 err = set_bitmap_file(mddev, (int)arg);
4499 mddev_unlock(mddev);
4509 static int md_open(struct inode *inode, struct file *file)
4512 * Succeed if we can lock the mddev, which confirms that
4513 * it isn't being stopped right now.
4515 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4518 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
4523 mddev_unlock(mddev);
4525 check_disk_change(inode->i_bdev);
4530 static int md_release(struct inode *inode, struct file * file)
4532 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4540 static int md_media_changed(struct gendisk *disk)
4542 mddev_t *mddev = disk->private_data;
4544 return mddev->changed;
4547 static int md_revalidate(struct gendisk *disk)
4549 mddev_t *mddev = disk->private_data;
4554 static struct block_device_operations md_fops =
4556 .owner = THIS_MODULE,
4558 .release = md_release,
4560 .getgeo = md_getgeo,
4561 .media_changed = md_media_changed,
4562 .revalidate_disk= md_revalidate,
4565 static int md_thread(void * arg)
4567 mdk_thread_t *thread = arg;
4570 * md_thread is a 'system-thread', it's priority should be very
4571 * high. We avoid resource deadlocks individually in each
4572 * raid personality. (RAID5 does preallocation) We also use RR and
4573 * the very same RT priority as kswapd, thus we will never get
4574 * into a priority inversion deadlock.
4576 * we definitely have to have equal or higher priority than
4577 * bdflush, otherwise bdflush will deadlock if there are too
4578 * many dirty RAID5 blocks.
4581 current->flags |= PF_NOFREEZE;
4582 allow_signal(SIGKILL);
4583 while (!kthread_should_stop()) {
4585 /* We need to wait INTERRUPTIBLE so that
4586 * we don't add to the load-average.
4587 * That means we need to be sure no signals are
4590 if (signal_pending(current))
4591 flush_signals(current);
4593 wait_event_interruptible_timeout
4595 test_bit(THREAD_WAKEUP, &thread->flags)
4596 || kthread_should_stop(),
4599 clear_bit(THREAD_WAKEUP, &thread->flags);
4601 thread->run(thread->mddev);
4607 void md_wakeup_thread(mdk_thread_t *thread)
4610 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4611 set_bit(THREAD_WAKEUP, &thread->flags);
4612 wake_up(&thread->wqueue);
4616 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4619 mdk_thread_t *thread;
4621 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
4625 init_waitqueue_head(&thread->wqueue);
4628 thread->mddev = mddev;
4629 thread->timeout = MAX_SCHEDULE_TIMEOUT;
4630 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
4631 if (IS_ERR(thread->tsk)) {
4638 void md_unregister_thread(mdk_thread_t *thread)
4640 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
4642 kthread_stop(thread->tsk);
4646 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4653 if (!rdev || test_bit(Faulty, &rdev->flags))
4656 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4658 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4659 __builtin_return_address(0),__builtin_return_address(1),
4660 __builtin_return_address(2),__builtin_return_address(3));
4664 if (!mddev->pers->error_handler)
4666 mddev->pers->error_handler(mddev,rdev);
4667 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4668 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4669 md_wakeup_thread(mddev->thread);
4670 md_new_event_inintr(mddev);
4673 /* seq_file implementation /proc/mdstat */
4675 static void status_unused(struct seq_file *seq)
4679 struct list_head *tmp;
4681 seq_printf(seq, "unused devices: ");
4683 ITERATE_RDEV_PENDING(rdev,tmp) {
4684 char b[BDEVNAME_SIZE];
4686 seq_printf(seq, "%s ",
4687 bdevname(rdev->bdev,b));
4690 seq_printf(seq, "<none>");
4692 seq_printf(seq, "\n");
4696 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4698 sector_t max_blocks, resync, res;
4699 unsigned long dt, db, rt;
4701 unsigned int per_milli;
4703 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4705 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4706 max_blocks = mddev->resync_max_sectors >> 1;
4708 max_blocks = mddev->size;
4711 * Should not happen.
4717 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4718 * in a sector_t, and (max_blocks>>scale) will fit in a
4719 * u32, as those are the requirements for sector_div.
4720 * Thus 'scale' must be at least 10
4723 if (sizeof(sector_t) > sizeof(unsigned long)) {
4724 while ( max_blocks/2 > (1ULL<<(scale+32)))
4727 res = (resync>>scale)*1000;
4728 sector_div(res, (u32)((max_blocks>>scale)+1));
4732 int i, x = per_milli/50, y = 20-x;
4733 seq_printf(seq, "[");
4734 for (i = 0; i < x; i++)
4735 seq_printf(seq, "=");
4736 seq_printf(seq, ">");
4737 for (i = 0; i < y; i++)
4738 seq_printf(seq, ".");
4739 seq_printf(seq, "] ");
4741 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
4742 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4744 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4746 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4747 "resync" : "recovery"))),
4748 per_milli/10, per_milli % 10,
4749 (unsigned long long) resync,
4750 (unsigned long long) max_blocks);
4753 * We do not want to overflow, so the order of operands and
4754 * the * 100 / 100 trick are important. We do a +1 to be
4755 * safe against division by zero. We only estimate anyway.
4757 * dt: time from mark until now
4758 * db: blocks written from mark until now
4759 * rt: remaining time
4761 dt = ((jiffies - mddev->resync_mark) / HZ);
4763 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4764 - mddev->resync_mark_cnt;
4765 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
4767 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4769 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
4772 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4774 struct list_head *tmp;
4784 spin_lock(&all_mddevs_lock);
4785 list_for_each(tmp,&all_mddevs)
4787 mddev = list_entry(tmp, mddev_t, all_mddevs);
4789 spin_unlock(&all_mddevs_lock);
4792 spin_unlock(&all_mddevs_lock);
4794 return (void*)2;/* tail */
4798 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4800 struct list_head *tmp;
4801 mddev_t *next_mddev, *mddev = v;
4807 spin_lock(&all_mddevs_lock);
4809 tmp = all_mddevs.next;
4811 tmp = mddev->all_mddevs.next;
4812 if (tmp != &all_mddevs)
4813 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4815 next_mddev = (void*)2;
4818 spin_unlock(&all_mddevs_lock);
4826 static void md_seq_stop(struct seq_file *seq, void *v)
4830 if (mddev && v != (void*)1 && v != (void*)2)
4834 struct mdstat_info {
4838 static int md_seq_show(struct seq_file *seq, void *v)
4842 struct list_head *tmp2;
4844 struct mdstat_info *mi = seq->private;
4845 struct bitmap *bitmap;
4847 if (v == (void*)1) {
4848 struct mdk_personality *pers;
4849 seq_printf(seq, "Personalities : ");
4850 spin_lock(&pers_lock);
4851 list_for_each_entry(pers, &pers_list, list)
4852 seq_printf(seq, "[%s] ", pers->name);
4854 spin_unlock(&pers_lock);
4855 seq_printf(seq, "\n");
4856 mi->event = atomic_read(&md_event_count);
4859 if (v == (void*)2) {
4864 if (mddev_lock(mddev) < 0)
4867 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4868 seq_printf(seq, "%s : %sactive", mdname(mddev),
4869 mddev->pers ? "" : "in");
4872 seq_printf(seq, " (read-only)");
4874 seq_printf(seq, "(auto-read-only)");
4875 seq_printf(seq, " %s", mddev->pers->name);
4879 ITERATE_RDEV(mddev,rdev,tmp2) {
4880 char b[BDEVNAME_SIZE];
4881 seq_printf(seq, " %s[%d]",
4882 bdevname(rdev->bdev,b), rdev->desc_nr);
4883 if (test_bit(WriteMostly, &rdev->flags))
4884 seq_printf(seq, "(W)");
4885 if (test_bit(Faulty, &rdev->flags)) {
4886 seq_printf(seq, "(F)");
4888 } else if (rdev->raid_disk < 0)
4889 seq_printf(seq, "(S)"); /* spare */
4893 if (!list_empty(&mddev->disks)) {
4895 seq_printf(seq, "\n %llu blocks",
4896 (unsigned long long)mddev->array_size);
4898 seq_printf(seq, "\n %llu blocks",
4899 (unsigned long long)size);
4901 if (mddev->persistent) {
4902 if (mddev->major_version != 0 ||
4903 mddev->minor_version != 90) {
4904 seq_printf(seq," super %d.%d",
4905 mddev->major_version,
4906 mddev->minor_version);
4909 seq_printf(seq, " super non-persistent");
4912 mddev->pers->status (seq, mddev);
4913 seq_printf(seq, "\n ");
4914 if (mddev->pers->sync_request) {
4915 if (mddev->curr_resync > 2) {
4916 status_resync (seq, mddev);
4917 seq_printf(seq, "\n ");
4918 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4919 seq_printf(seq, "\tresync=DELAYED\n ");
4920 else if (mddev->recovery_cp < MaxSector)
4921 seq_printf(seq, "\tresync=PENDING\n ");
4924 seq_printf(seq, "\n ");
4926 if ((bitmap = mddev->bitmap)) {
4927 unsigned long chunk_kb;
4928 unsigned long flags;
4929 spin_lock_irqsave(&bitmap->lock, flags);
4930 chunk_kb = bitmap->chunksize >> 10;
4931 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4933 bitmap->pages - bitmap->missing_pages,
4935 (bitmap->pages - bitmap->missing_pages)
4936 << (PAGE_SHIFT - 10),
4937 chunk_kb ? chunk_kb : bitmap->chunksize,
4938 chunk_kb ? "KB" : "B");
4940 seq_printf(seq, ", file: ");
4941 seq_path(seq, bitmap->file->f_path.mnt,
4942 bitmap->file->f_path.dentry," \t\n");
4945 seq_printf(seq, "\n");
4946 spin_unlock_irqrestore(&bitmap->lock, flags);
4949 seq_printf(seq, "\n");
4951 mddev_unlock(mddev);
4956 static struct seq_operations md_seq_ops = {
4957 .start = md_seq_start,
4958 .next = md_seq_next,
4959 .stop = md_seq_stop,
4960 .show = md_seq_show,
4963 static int md_seq_open(struct inode *inode, struct file *file)
4966 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4970 error = seq_open(file, &md_seq_ops);
4974 struct seq_file *p = file->private_data;
4976 mi->event = atomic_read(&md_event_count);
4981 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4983 struct seq_file *m = filp->private_data;
4984 struct mdstat_info *mi = m->private;
4987 poll_wait(filp, &md_event_waiters, wait);
4989 /* always allow read */
4990 mask = POLLIN | POLLRDNORM;
4992 if (mi->event != atomic_read(&md_event_count))
4993 mask |= POLLERR | POLLPRI;
4997 static const struct file_operations md_seq_fops = {
4998 .owner = THIS_MODULE,
4999 .open = md_seq_open,
5001 .llseek = seq_lseek,
5002 .release = seq_release_private,
5003 .poll = mdstat_poll,
5006 int register_md_personality(struct mdk_personality *p)
5008 spin_lock(&pers_lock);
5009 list_add_tail(&p->list, &pers_list);
5010 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5011 spin_unlock(&pers_lock);
5015 int unregister_md_personality(struct mdk_personality *p)
5017 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5018 spin_lock(&pers_lock);
5019 list_del_init(&p->list);
5020 spin_unlock(&pers_lock);
5024 static int is_mddev_idle(mddev_t *mddev)
5027 struct list_head *tmp;
5029 unsigned long curr_events;
5032 ITERATE_RDEV(mddev,rdev,tmp) {
5033 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5034 curr_events = disk_stat_read(disk, sectors[0]) +
5035 disk_stat_read(disk, sectors[1]) -
5036 atomic_read(&disk->sync_io);
5037 /* The difference between curr_events and last_events
5038 * will be affected by any new non-sync IO (making
5039 * curr_events bigger) and any difference in the amount of
5040 * in-flight syncio (making current_events bigger or smaller)
5041 * The amount in-flight is currently limited to
5042 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
5043 * which is at most 4096 sectors.
5044 * These numbers are fairly fragile and should be made
5045 * more robust, probably by enforcing the
5046 * 'window size' that md_do_sync sort-of uses.
5048 * Note: the following is an unsigned comparison.
5050 if ((curr_events - rdev->last_events + 4096) > 8192) {
5051 rdev->last_events = curr_events;
5058 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5060 /* another "blocks" (512byte) blocks have been synced */
5061 atomic_sub(blocks, &mddev->recovery_active);
5062 wake_up(&mddev->recovery_wait);
5064 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5065 md_wakeup_thread(mddev->thread);
5066 // stop recovery, signal do_sync ....
5071 /* md_write_start(mddev, bi)
5072 * If we need to update some array metadata (e.g. 'active' flag
5073 * in superblock) before writing, schedule a superblock update
5074 * and wait for it to complete.
5076 void md_write_start(mddev_t *mddev, struct bio *bi)
5078 if (bio_data_dir(bi) != WRITE)
5081 BUG_ON(mddev->ro == 1);
5082 if (mddev->ro == 2) {
5083 /* need to switch to read/write */
5085 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5086 md_wakeup_thread(mddev->thread);
5088 atomic_inc(&mddev->writes_pending);
5089 if (mddev->in_sync) {
5090 spin_lock_irq(&mddev->write_lock);
5091 if (mddev->in_sync) {
5093 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5094 md_wakeup_thread(mddev->thread);
5096 spin_unlock_irq(&mddev->write_lock);
5098 wait_event(mddev->sb_wait, mddev->flags==0);
5101 void md_write_end(mddev_t *mddev)
5103 if (atomic_dec_and_test(&mddev->writes_pending)) {
5104 if (mddev->safemode == 2)
5105 md_wakeup_thread(mddev->thread);
5106 else if (mddev->safemode_delay)
5107 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5111 /* md_allow_write(mddev)
5112 * Calling this ensures that the array is marked 'active' so that writes
5113 * may proceed without blocking. It is important to call this before
5114 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5115 * Must be called with mddev_lock held.
5117 void md_allow_write(mddev_t *mddev)
5124 spin_lock_irq(&mddev->write_lock);
5125 if (mddev->in_sync) {
5127 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5128 if (mddev->safemode_delay &&
5129 mddev->safemode == 0)
5130 mddev->safemode = 1;
5131 spin_unlock_irq(&mddev->write_lock);
5132 md_update_sb(mddev, 0);
5134 spin_unlock_irq(&mddev->write_lock);
5136 EXPORT_SYMBOL_GPL(md_allow_write);
5138 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
5140 #define SYNC_MARKS 10
5141 #define SYNC_MARK_STEP (3*HZ)
5142 void md_do_sync(mddev_t *mddev)
5145 unsigned int currspeed = 0,
5147 sector_t max_sectors,j, io_sectors;
5148 unsigned long mark[SYNC_MARKS];
5149 sector_t mark_cnt[SYNC_MARKS];
5151 struct list_head *tmp;
5152 sector_t last_check;
5154 struct list_head *rtmp;
5158 /* just incase thread restarts... */
5159 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5161 if (mddev->ro) /* never try to sync a read-only array */
5164 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5165 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5166 desc = "data-check";
5167 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5168 desc = "requested-resync";
5171 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5176 /* we overload curr_resync somewhat here.
5177 * 0 == not engaged in resync at all
5178 * 2 == checking that there is no conflict with another sync
5179 * 1 == like 2, but have yielded to allow conflicting resync to
5181 * other == active in resync - this many blocks
5183 * Before starting a resync we must have set curr_resync to
5184 * 2, and then checked that every "conflicting" array has curr_resync
5185 * less than ours. When we find one that is the same or higher
5186 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5187 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5188 * This will mean we have to start checking from the beginning again.
5193 mddev->curr_resync = 2;
5196 if (kthread_should_stop()) {
5197 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5200 ITERATE_MDDEV(mddev2,tmp) {
5201 if (mddev2 == mddev)
5203 if (mddev2->curr_resync &&
5204 match_mddev_units(mddev,mddev2)) {
5206 if (mddev < mddev2 && mddev->curr_resync == 2) {
5207 /* arbitrarily yield */
5208 mddev->curr_resync = 1;
5209 wake_up(&resync_wait);
5211 if (mddev > mddev2 && mddev->curr_resync == 1)
5212 /* no need to wait here, we can wait the next
5213 * time 'round when curr_resync == 2
5216 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5217 if (!kthread_should_stop() &&
5218 mddev2->curr_resync >= mddev->curr_resync) {
5219 printk(KERN_INFO "md: delaying %s of %s"
5220 " until %s has finished (they"
5221 " share one or more physical units)\n",
5222 desc, mdname(mddev), mdname(mddev2));
5225 finish_wait(&resync_wait, &wq);
5228 finish_wait(&resync_wait, &wq);
5231 } while (mddev->curr_resync < 2);
5234 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5235 /* resync follows the size requested by the personality,
5236 * which defaults to physical size, but can be virtual size
5238 max_sectors = mddev->resync_max_sectors;
5239 mddev->resync_mismatches = 0;
5240 /* we don't use the checkpoint if there's a bitmap */
5241 if (!mddev->bitmap &&
5242 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5243 j = mddev->recovery_cp;
5244 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5245 max_sectors = mddev->size << 1;
5247 /* recovery follows the physical size of devices */
5248 max_sectors = mddev->size << 1;
5250 ITERATE_RDEV(mddev,rdev,rtmp)
5251 if (rdev->raid_disk >= 0 &&
5252 !test_bit(Faulty, &rdev->flags) &&
5253 !test_bit(In_sync, &rdev->flags) &&
5254 rdev->recovery_offset < j)
5255 j = rdev->recovery_offset;
5258 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5259 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5260 " %d KB/sec/disk.\n", speed_min(mddev));
5261 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5262 "(but not more than %d KB/sec) for %s.\n",
5263 speed_max(mddev), desc);
5265 is_mddev_idle(mddev); /* this also initializes IO event counters */
5268 for (m = 0; m < SYNC_MARKS; m++) {
5270 mark_cnt[m] = io_sectors;
5273 mddev->resync_mark = mark[last_mark];
5274 mddev->resync_mark_cnt = mark_cnt[last_mark];
5277 * Tune reconstruction:
5279 window = 32*(PAGE_SIZE/512);
5280 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5281 window/2,(unsigned long long) max_sectors/2);
5283 atomic_set(&mddev->recovery_active, 0);
5284 init_waitqueue_head(&mddev->recovery_wait);
5289 "md: resuming %s of %s from checkpoint.\n",
5290 desc, mdname(mddev));
5291 mddev->curr_resync = j;
5294 while (j < max_sectors) {
5298 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5299 currspeed < speed_min(mddev));
5301 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5305 if (!skipped) { /* actual IO requested */
5306 io_sectors += sectors;
5307 atomic_add(sectors, &mddev->recovery_active);
5311 if (j>1) mddev->curr_resync = j;
5312 mddev->curr_mark_cnt = io_sectors;
5313 if (last_check == 0)
5314 /* this is the earliers that rebuilt will be
5315 * visible in /proc/mdstat
5317 md_new_event(mddev);
5319 if (last_check + window > io_sectors || j == max_sectors)
5322 last_check = io_sectors;
5324 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5325 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5329 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5331 int next = (last_mark+1) % SYNC_MARKS;
5333 mddev->resync_mark = mark[next];
5334 mddev->resync_mark_cnt = mark_cnt[next];
5335 mark[next] = jiffies;
5336 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5341 if (kthread_should_stop()) {
5343 * got a signal, exit.
5346 "md: md_do_sync() got signal ... exiting\n");
5347 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5352 * this loop exits only if either when we are slower than
5353 * the 'hard' speed limit, or the system was IO-idle for
5355 * the system might be non-idle CPU-wise, but we only care
5356 * about not overloading the IO subsystem. (things like an
5357 * e2fsck being done on the RAID array should execute fast)
5359 mddev->queue->unplug_fn(mddev->queue);
5362 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5363 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5365 if (currspeed > speed_min(mddev)) {
5366 if ((currspeed > speed_max(mddev)) ||
5367 !is_mddev_idle(mddev)) {
5373 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5375 * this also signals 'finished resyncing' to md_stop
5378 mddev->queue->unplug_fn(mddev->queue);
5380 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5382 /* tell personality that we are finished */
5383 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5385 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5386 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5387 mddev->curr_resync > 2) {
5388 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5389 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5390 if (mddev->curr_resync >= mddev->recovery_cp) {
5392 "md: checkpointing %s of %s.\n",
5393 desc, mdname(mddev));
5394 mddev->recovery_cp = mddev->curr_resync;
5397 mddev->recovery_cp = MaxSector;
5399 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5400 mddev->curr_resync = MaxSector;
5401 ITERATE_RDEV(mddev,rdev,rtmp)
5402 if (rdev->raid_disk >= 0 &&
5403 !test_bit(Faulty, &rdev->flags) &&
5404 !test_bit(In_sync, &rdev->flags) &&
5405 rdev->recovery_offset < mddev->curr_resync)
5406 rdev->recovery_offset = mddev->curr_resync;
5409 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5412 mddev->curr_resync = 0;
5413 wake_up(&resync_wait);
5414 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5415 md_wakeup_thread(mddev->thread);
5417 EXPORT_SYMBOL_GPL(md_do_sync);
5420 static int remove_and_add_spares(mddev_t *mddev)
5423 struct list_head *rtmp;
5426 ITERATE_RDEV(mddev,rdev,rtmp)
5427 if (rdev->raid_disk >= 0 &&
5428 (test_bit(Faulty, &rdev->flags) ||
5429 ! test_bit(In_sync, &rdev->flags)) &&
5430 atomic_read(&rdev->nr_pending)==0) {
5431 if (mddev->pers->hot_remove_disk(
5432 mddev, rdev->raid_disk)==0) {
5434 sprintf(nm,"rd%d", rdev->raid_disk);
5435 sysfs_remove_link(&mddev->kobj, nm);
5436 rdev->raid_disk = -1;
5440 if (mddev->degraded) {
5441 ITERATE_RDEV(mddev,rdev,rtmp)
5442 if (rdev->raid_disk < 0
5443 && !test_bit(Faulty, &rdev->flags)) {
5444 rdev->recovery_offset = 0;
5445 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5447 sprintf(nm, "rd%d", rdev->raid_disk);
5448 if (sysfs_create_link(&mddev->kobj,
5451 "md: cannot register "
5455 md_new_event(mddev);
5463 * This routine is regularly called by all per-raid-array threads to
5464 * deal with generic issues like resync and super-block update.
5465 * Raid personalities that don't have a thread (linear/raid0) do not
5466 * need this as they never do any recovery or update the superblock.
5468 * It does not do any resync itself, but rather "forks" off other threads
5469 * to do that as needed.
5470 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5471 * "->recovery" and create a thread at ->sync_thread.
5472 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5473 * and wakeups up this thread which will reap the thread and finish up.
5474 * This thread also removes any faulty devices (with nr_pending == 0).
5476 * The overall approach is:
5477 * 1/ if the superblock needs updating, update it.
5478 * 2/ If a recovery thread is running, don't do anything else.
5479 * 3/ If recovery has finished, clean up, possibly marking spares active.
5480 * 4/ If there are any faulty devices, remove them.
5481 * 5/ If array is degraded, try to add spares devices
5482 * 6/ If array has spares or is not in-sync, start a resync thread.
5484 void md_check_recovery(mddev_t *mddev)
5487 struct list_head *rtmp;
5491 bitmap_daemon_work(mddev->bitmap);
5496 if (signal_pending(current)) {
5497 if (mddev->pers->sync_request) {
5498 printk(KERN_INFO "md: %s in immediate safe mode\n",
5500 mddev->safemode = 2;
5502 flush_signals(current);
5507 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
5508 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5509 (mddev->safemode == 1) ||
5510 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5511 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
5515 if (mddev_trylock(mddev)) {
5518 spin_lock_irq(&mddev->write_lock);
5519 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5520 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5522 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5524 if (mddev->safemode == 1)
5525 mddev->safemode = 0;
5526 spin_unlock_irq(&mddev->write_lock);
5529 md_update_sb(mddev, 0);
5532 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5533 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5534 /* resync/recovery still happening */
5535 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5538 if (mddev->sync_thread) {
5539 /* resync has finished, collect result */
5540 md_unregister_thread(mddev->sync_thread);
5541 mddev->sync_thread = NULL;
5542 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5543 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5545 /* activate any spares */
5546 mddev->pers->spare_active(mddev);
5548 md_update_sb(mddev, 1);
5550 /* if array is no-longer degraded, then any saved_raid_disk
5551 * information must be scrapped
5553 if (!mddev->degraded)
5554 ITERATE_RDEV(mddev,rdev,rtmp)
5555 rdev->saved_raid_disk = -1;
5557 mddev->recovery = 0;
5558 /* flag recovery needed just to double check */
5559 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5560 md_new_event(mddev);
5563 /* Clear some bits that don't mean anything, but
5566 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5567 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5568 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5569 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
5571 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5573 /* no recovery is running.
5574 * remove any failed drives, then
5575 * add spares if possible.
5576 * Spare are also removed and re-added, to allow
5577 * the personality to fail the re-add.
5580 if (mddev->reshape_position != MaxSector) {
5581 if (mddev->pers->check_reshape(mddev) != 0)
5582 /* Cannot proceed */
5584 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5585 } else if ((spares = remove_and_add_spares(mddev))) {
5586 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5587 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5588 } else if (mddev->recovery_cp < MaxSector) {
5589 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5590 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5591 /* nothing to be done ... */
5594 if (mddev->pers->sync_request) {
5595 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
5596 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5597 /* We are adding a device or devices to an array
5598 * which has the bitmap stored on all devices.
5599 * So make sure all bitmap pages get written
5601 bitmap_write_all(mddev->bitmap);
5603 mddev->sync_thread = md_register_thread(md_do_sync,
5606 if (!mddev->sync_thread) {
5607 printk(KERN_ERR "%s: could not start resync"
5610 /* leave the spares where they are, it shouldn't hurt */
5611 mddev->recovery = 0;
5613 md_wakeup_thread(mddev->sync_thread);
5614 md_new_event(mddev);
5617 mddev_unlock(mddev);
5621 static int md_notify_reboot(struct notifier_block *this,
5622 unsigned long code, void *x)
5624 struct list_head *tmp;
5627 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5629 printk(KERN_INFO "md: stopping all md devices.\n");
5631 ITERATE_MDDEV(mddev,tmp)
5632 if (mddev_trylock(mddev)) {
5633 do_md_stop (mddev, 1);
5634 mddev_unlock(mddev);
5637 * certain more exotic SCSI devices are known to be
5638 * volatile wrt too early system reboots. While the
5639 * right place to handle this issue is the given
5640 * driver, we do want to have a safe RAID driver ...
5647 static struct notifier_block md_notifier = {
5648 .notifier_call = md_notify_reboot,
5650 .priority = INT_MAX, /* before any real devices */
5653 static void md_geninit(void)
5655 struct proc_dir_entry *p;
5657 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5659 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5661 p->proc_fops = &md_seq_fops;
5664 static int __init md_init(void)
5666 if (register_blkdev(MAJOR_NR, "md"))
5668 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5669 unregister_blkdev(MAJOR_NR, "md");
5672 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5673 md_probe, NULL, NULL);
5674 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
5675 md_probe, NULL, NULL);
5677 register_reboot_notifier(&md_notifier);
5678 raid_table_header = register_sysctl_table(raid_root_table);
5688 * Searches all registered partitions for autorun RAID arrays
5691 static dev_t detected_devices[128];
5694 void md_autodetect_dev(dev_t dev)
5696 if (dev_cnt >= 0 && dev_cnt < 127)
5697 detected_devices[dev_cnt++] = dev;
5701 static void autostart_arrays(int part)
5706 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5708 for (i = 0; i < dev_cnt; i++) {
5709 dev_t dev = detected_devices[i];
5711 rdev = md_import_device(dev,0, 0);
5715 if (test_bit(Faulty, &rdev->flags)) {
5719 list_add(&rdev->same_set, &pending_raid_disks);
5723 autorun_devices(part);
5726 #endif /* !MODULE */
5728 static __exit void md_exit(void)
5731 struct list_head *tmp;
5733 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
5734 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
5736 unregister_blkdev(MAJOR_NR,"md");
5737 unregister_blkdev(mdp_major, "mdp");
5738 unregister_reboot_notifier(&md_notifier);
5739 unregister_sysctl_table(raid_table_header);
5740 remove_proc_entry("mdstat", NULL);
5741 ITERATE_MDDEV(mddev,tmp) {
5742 struct gendisk *disk = mddev->gendisk;
5745 export_array(mddev);
5748 mddev->gendisk = NULL;
5753 module_init(md_init)
5754 module_exit(md_exit)
5756 static int get_ro(char *buffer, struct kernel_param *kp)
5758 return sprintf(buffer, "%d", start_readonly);
5760 static int set_ro(const char *val, struct kernel_param *kp)
5763 int num = simple_strtoul(val, &e, 10);
5764 if (*val && (*e == '\0' || *e == '\n')) {
5765 start_readonly = num;
5771 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
5772 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
5775 EXPORT_SYMBOL(register_md_personality);
5776 EXPORT_SYMBOL(unregister_md_personality);
5777 EXPORT_SYMBOL(md_error);
5778 EXPORT_SYMBOL(md_done_sync);
5779 EXPORT_SYMBOL(md_write_start);
5780 EXPORT_SYMBOL(md_write_end);
5781 EXPORT_SYMBOL(md_register_thread);
5782 EXPORT_SYMBOL(md_unregister_thread);
5783 EXPORT_SYMBOL(md_wakeup_thread);
5784 EXPORT_SYMBOL(md_check_recovery);
5785 MODULE_LICENSE("GPL");
5787 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);