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 (struct request_queue *q, struct bio *bio)
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_put(&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);
277 new->reshape_position = MaxSector;
278 new->resync_max = MaxSector;
280 new->queue = blk_alloc_queue(GFP_KERNEL);
285 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
287 blk_queue_make_request(new->queue, md_fail_request);
292 static inline int mddev_lock(mddev_t * mddev)
294 return mutex_lock_interruptible(&mddev->reconfig_mutex);
297 static inline int mddev_trylock(mddev_t * mddev)
299 return mutex_trylock(&mddev->reconfig_mutex);
302 static inline void mddev_unlock(mddev_t * mddev)
304 mutex_unlock(&mddev->reconfig_mutex);
306 md_wakeup_thread(mddev->thread);
309 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
312 struct list_head *tmp;
314 ITERATE_RDEV(mddev,rdev,tmp) {
315 if (rdev->desc_nr == nr)
321 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
323 struct list_head *tmp;
326 ITERATE_RDEV(mddev,rdev,tmp) {
327 if (rdev->bdev->bd_dev == dev)
333 static struct mdk_personality *find_pers(int level, char *clevel)
335 struct mdk_personality *pers;
336 list_for_each_entry(pers, &pers_list, list) {
337 if (level != LEVEL_NONE && pers->level == level)
339 if (strcmp(pers->name, clevel)==0)
345 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
347 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
348 return MD_NEW_SIZE_BLOCKS(size);
351 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
355 size = rdev->sb_offset;
358 size &= ~((sector_t)chunk_size/1024 - 1);
362 static int alloc_disk_sb(mdk_rdev_t * rdev)
367 rdev->sb_page = alloc_page(GFP_KERNEL);
368 if (!rdev->sb_page) {
369 printk(KERN_ALERT "md: out of memory.\n");
376 static void free_disk_sb(mdk_rdev_t * rdev)
379 put_page(rdev->sb_page);
381 rdev->sb_page = NULL;
388 static void super_written(struct bio *bio, int error)
390 mdk_rdev_t *rdev = bio->bi_private;
391 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);
405 static void super_written_barrier(struct bio *bio, int error)
407 struct bio *bio2 = bio->bi_private;
408 mdk_rdev_t *rdev = bio2->bi_private;
409 mddev_t *mddev = rdev->mddev;
411 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
412 error == -EOPNOTSUPP) {
414 /* barriers don't appear to be supported :-( */
415 set_bit(BarriersNotsupp, &rdev->flags);
416 mddev->barriers_work = 0;
417 spin_lock_irqsave(&mddev->write_lock, flags);
418 bio2->bi_next = mddev->biolist;
419 mddev->biolist = bio2;
420 spin_unlock_irqrestore(&mddev->write_lock, flags);
421 wake_up(&mddev->sb_wait);
425 bio->bi_private = rdev;
426 super_written(bio, error);
430 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
431 sector_t sector, int size, struct page *page)
433 /* write first size bytes of page to sector of rdev
434 * Increment mddev->pending_writes before returning
435 * and decrement it on completion, waking up sb_wait
436 * if zero is reached.
437 * If an error occurred, call md_error
439 * As we might need to resubmit the request if BIO_RW_BARRIER
440 * causes ENOTSUPP, we allocate a spare bio...
442 struct bio *bio = bio_alloc(GFP_NOIO, 1);
443 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
445 bio->bi_bdev = rdev->bdev;
446 bio->bi_sector = sector;
447 bio_add_page(bio, page, size, 0);
448 bio->bi_private = rdev;
449 bio->bi_end_io = super_written;
452 atomic_inc(&mddev->pending_writes);
453 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
455 rw |= (1<<BIO_RW_BARRIER);
456 rbio = bio_clone(bio, GFP_NOIO);
457 rbio->bi_private = bio;
458 rbio->bi_end_io = super_written_barrier;
459 submit_bio(rw, rbio);
464 void md_super_wait(mddev_t *mddev)
466 /* wait for all superblock writes that were scheduled to complete.
467 * if any had to be retried (due to BARRIER problems), retry them
471 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
472 if (atomic_read(&mddev->pending_writes)==0)
474 while (mddev->biolist) {
476 spin_lock_irq(&mddev->write_lock);
477 bio = mddev->biolist;
478 mddev->biolist = bio->bi_next ;
480 spin_unlock_irq(&mddev->write_lock);
481 submit_bio(bio->bi_rw, bio);
485 finish_wait(&mddev->sb_wait, &wq);
488 static void bi_complete(struct bio *bio, int error)
490 complete((struct completion*)bio->bi_private);
493 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
494 struct page *page, int rw)
496 struct bio *bio = bio_alloc(GFP_NOIO, 1);
497 struct completion event;
500 rw |= (1 << BIO_RW_SYNC);
503 bio->bi_sector = sector;
504 bio_add_page(bio, page, size, 0);
505 init_completion(&event);
506 bio->bi_private = &event;
507 bio->bi_end_io = bi_complete;
509 wait_for_completion(&event);
511 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
515 EXPORT_SYMBOL_GPL(sync_page_io);
517 static int read_disk_sb(mdk_rdev_t * rdev, int size)
519 char b[BDEVNAME_SIZE];
520 if (!rdev->sb_page) {
528 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
534 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
535 bdevname(rdev->bdev,b));
539 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
541 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
542 (sb1->set_uuid1 == sb2->set_uuid1) &&
543 (sb1->set_uuid2 == sb2->set_uuid2) &&
544 (sb1->set_uuid3 == sb2->set_uuid3))
552 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
555 mdp_super_t *tmp1, *tmp2;
557 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
558 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
560 if (!tmp1 || !tmp2) {
562 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
570 * nr_disks is not constant
575 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
587 static u32 md_csum_fold(u32 csum)
589 csum = (csum & 0xffff) + (csum >> 16);
590 return (csum & 0xffff) + (csum >> 16);
593 static unsigned int calc_sb_csum(mdp_super_t * sb)
596 u32 *sb32 = (u32*)sb;
598 unsigned int disk_csum, csum;
600 disk_csum = sb->sb_csum;
603 for (i = 0; i < MD_SB_BYTES/4 ; i++)
605 csum = (newcsum & 0xffffffff) + (newcsum>>32);
609 /* This used to use csum_partial, which was wrong for several
610 * reasons including that different results are returned on
611 * different architectures. It isn't critical that we get exactly
612 * the same return value as before (we always csum_fold before
613 * testing, and that removes any differences). However as we
614 * know that csum_partial always returned a 16bit value on
615 * alphas, do a fold to maximise conformity to previous behaviour.
617 sb->sb_csum = md_csum_fold(disk_csum);
619 sb->sb_csum = disk_csum;
626 * Handle superblock details.
627 * We want to be able to handle multiple superblock formats
628 * so we have a common interface to them all, and an array of
629 * different handlers.
630 * We rely on user-space to write the initial superblock, and support
631 * reading and updating of superblocks.
632 * Interface methods are:
633 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
634 * loads and validates a superblock on dev.
635 * if refdev != NULL, compare superblocks on both devices
637 * 0 - dev has a superblock that is compatible with refdev
638 * 1 - dev has a superblock that is compatible and newer than refdev
639 * so dev should be used as the refdev in future
640 * -EINVAL superblock incompatible or invalid
641 * -othererror e.g. -EIO
643 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
644 * Verify that dev is acceptable into mddev.
645 * The first time, mddev->raid_disks will be 0, and data from
646 * dev should be merged in. Subsequent calls check that dev
647 * is new enough. Return 0 or -EINVAL
649 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
650 * Update the superblock for rdev with data in mddev
651 * This does not write to disc.
657 struct module *owner;
658 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
659 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
660 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
664 * load_super for 0.90.0
666 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
668 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
674 * Calculate the position of the superblock,
675 * it's at the end of the disk.
677 * It also happens to be a multiple of 4Kb.
679 sb_offset = calc_dev_sboffset(rdev->bdev);
680 rdev->sb_offset = sb_offset;
682 ret = read_disk_sb(rdev, MD_SB_BYTES);
687 bdevname(rdev->bdev, b);
688 sb = (mdp_super_t*)page_address(rdev->sb_page);
690 if (sb->md_magic != MD_SB_MAGIC) {
691 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
696 if (sb->major_version != 0 ||
697 sb->minor_version < 90 ||
698 sb->minor_version > 91) {
699 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
700 sb->major_version, sb->minor_version,
705 if (sb->raid_disks <= 0)
708 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
709 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
714 rdev->preferred_minor = sb->md_minor;
715 rdev->data_offset = 0;
716 rdev->sb_size = MD_SB_BYTES;
718 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
719 if (sb->level != 1 && sb->level != 4
720 && sb->level != 5 && sb->level != 6
721 && sb->level != 10) {
722 /* FIXME use a better test */
724 "md: bitmaps not supported for this level.\n");
729 if (sb->level == LEVEL_MULTIPATH)
732 rdev->desc_nr = sb->this_disk.number;
738 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
739 if (!uuid_equal(refsb, sb)) {
740 printk(KERN_WARNING "md: %s has different UUID to %s\n",
741 b, bdevname(refdev->bdev,b2));
744 if (!sb_equal(refsb, sb)) {
745 printk(KERN_WARNING "md: %s has same UUID"
746 " but different superblock to %s\n",
747 b, bdevname(refdev->bdev, b2));
751 ev2 = md_event(refsb);
757 rdev->size = calc_dev_size(rdev, sb->chunk_size);
759 if (rdev->size < sb->size && sb->level > 1)
760 /* "this cannot possibly happen" ... */
768 * validate_super for 0.90.0
770 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
773 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
774 __u64 ev1 = md_event(sb);
776 rdev->raid_disk = -1;
778 if (mddev->raid_disks == 0) {
779 mddev->major_version = 0;
780 mddev->minor_version = sb->minor_version;
781 mddev->patch_version = sb->patch_version;
783 mddev->chunk_size = sb->chunk_size;
784 mddev->ctime = sb->ctime;
785 mddev->utime = sb->utime;
786 mddev->level = sb->level;
787 mddev->clevel[0] = 0;
788 mddev->layout = sb->layout;
789 mddev->raid_disks = sb->raid_disks;
790 mddev->size = sb->size;
792 mddev->bitmap_offset = 0;
793 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
795 if (mddev->minor_version >= 91) {
796 mddev->reshape_position = sb->reshape_position;
797 mddev->delta_disks = sb->delta_disks;
798 mddev->new_level = sb->new_level;
799 mddev->new_layout = sb->new_layout;
800 mddev->new_chunk = sb->new_chunk;
802 mddev->reshape_position = MaxSector;
803 mddev->delta_disks = 0;
804 mddev->new_level = mddev->level;
805 mddev->new_layout = mddev->layout;
806 mddev->new_chunk = mddev->chunk_size;
809 if (sb->state & (1<<MD_SB_CLEAN))
810 mddev->recovery_cp = MaxSector;
812 if (sb->events_hi == sb->cp_events_hi &&
813 sb->events_lo == sb->cp_events_lo) {
814 mddev->recovery_cp = sb->recovery_cp;
816 mddev->recovery_cp = 0;
819 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
820 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
821 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
822 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
824 mddev->max_disks = MD_SB_DISKS;
826 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
827 mddev->bitmap_file == NULL)
828 mddev->bitmap_offset = mddev->default_bitmap_offset;
830 } else if (mddev->pers == NULL) {
831 /* Insist on good event counter while assembling */
833 if (ev1 < mddev->events)
835 } else if (mddev->bitmap) {
836 /* if adding to array with a bitmap, then we can accept an
837 * older device ... but not too old.
839 if (ev1 < mddev->bitmap->events_cleared)
842 if (ev1 < mddev->events)
843 /* just a hot-add of a new device, leave raid_disk at -1 */
847 if (mddev->level != LEVEL_MULTIPATH) {
848 desc = sb->disks + rdev->desc_nr;
850 if (desc->state & (1<<MD_DISK_FAULTY))
851 set_bit(Faulty, &rdev->flags);
852 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
853 desc->raid_disk < mddev->raid_disks */) {
854 set_bit(In_sync, &rdev->flags);
855 rdev->raid_disk = desc->raid_disk;
857 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
858 set_bit(WriteMostly, &rdev->flags);
859 } else /* MULTIPATH are always insync */
860 set_bit(In_sync, &rdev->flags);
865 * sync_super for 0.90.0
867 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
870 struct list_head *tmp;
872 int next_spare = mddev->raid_disks;
875 /* make rdev->sb match mddev data..
878 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
879 * 3/ any empty disks < next_spare become removed
881 * disks[0] gets initialised to REMOVED because
882 * we cannot be sure from other fields if it has
883 * been initialised or not.
886 int active=0, working=0,failed=0,spare=0,nr_disks=0;
888 rdev->sb_size = MD_SB_BYTES;
890 sb = (mdp_super_t*)page_address(rdev->sb_page);
892 memset(sb, 0, sizeof(*sb));
894 sb->md_magic = MD_SB_MAGIC;
895 sb->major_version = mddev->major_version;
896 sb->patch_version = mddev->patch_version;
897 sb->gvalid_words = 0; /* ignored */
898 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
899 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
900 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
901 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
903 sb->ctime = mddev->ctime;
904 sb->level = mddev->level;
905 sb->size = mddev->size;
906 sb->raid_disks = mddev->raid_disks;
907 sb->md_minor = mddev->md_minor;
908 sb->not_persistent = 0;
909 sb->utime = mddev->utime;
911 sb->events_hi = (mddev->events>>32);
912 sb->events_lo = (u32)mddev->events;
914 if (mddev->reshape_position == MaxSector)
915 sb->minor_version = 90;
917 sb->minor_version = 91;
918 sb->reshape_position = mddev->reshape_position;
919 sb->new_level = mddev->new_level;
920 sb->delta_disks = mddev->delta_disks;
921 sb->new_layout = mddev->new_layout;
922 sb->new_chunk = mddev->new_chunk;
924 mddev->minor_version = sb->minor_version;
927 sb->recovery_cp = mddev->recovery_cp;
928 sb->cp_events_hi = (mddev->events>>32);
929 sb->cp_events_lo = (u32)mddev->events;
930 if (mddev->recovery_cp == MaxSector)
931 sb->state = (1<< MD_SB_CLEAN);
935 sb->layout = mddev->layout;
936 sb->chunk_size = mddev->chunk_size;
938 if (mddev->bitmap && mddev->bitmap_file == NULL)
939 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
941 sb->disks[0].state = (1<<MD_DISK_REMOVED);
942 ITERATE_RDEV(mddev,rdev2,tmp) {
945 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
946 && !test_bit(Faulty, &rdev2->flags))
947 desc_nr = rdev2->raid_disk;
949 desc_nr = next_spare++;
950 rdev2->desc_nr = desc_nr;
951 d = &sb->disks[rdev2->desc_nr];
953 d->number = rdev2->desc_nr;
954 d->major = MAJOR(rdev2->bdev->bd_dev);
955 d->minor = MINOR(rdev2->bdev->bd_dev);
956 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
957 && !test_bit(Faulty, &rdev2->flags))
958 d->raid_disk = rdev2->raid_disk;
960 d->raid_disk = rdev2->desc_nr; /* compatibility */
961 if (test_bit(Faulty, &rdev2->flags))
962 d->state = (1<<MD_DISK_FAULTY);
963 else if (test_bit(In_sync, &rdev2->flags)) {
964 d->state = (1<<MD_DISK_ACTIVE);
965 d->state |= (1<<MD_DISK_SYNC);
973 if (test_bit(WriteMostly, &rdev2->flags))
974 d->state |= (1<<MD_DISK_WRITEMOSTLY);
976 /* now set the "removed" and "faulty" bits on any missing devices */
977 for (i=0 ; i < mddev->raid_disks ; i++) {
978 mdp_disk_t *d = &sb->disks[i];
979 if (d->state == 0 && d->number == 0) {
982 d->state = (1<<MD_DISK_REMOVED);
983 d->state |= (1<<MD_DISK_FAULTY);
987 sb->nr_disks = nr_disks;
988 sb->active_disks = active;
989 sb->working_disks = working;
990 sb->failed_disks = failed;
991 sb->spare_disks = spare;
993 sb->this_disk = sb->disks[rdev->desc_nr];
994 sb->sb_csum = calc_sb_csum(sb);
998 * version 1 superblock
1001 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1005 unsigned long long newcsum;
1006 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1007 __le32 *isuper = (__le32*)sb;
1010 disk_csum = sb->sb_csum;
1013 for (i=0; size>=4; size -= 4 )
1014 newcsum += le32_to_cpu(*isuper++);
1017 newcsum += le16_to_cpu(*(__le16*) isuper);
1019 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1020 sb->sb_csum = disk_csum;
1021 return cpu_to_le32(csum);
1024 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1026 struct mdp_superblock_1 *sb;
1029 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1033 * Calculate the position of the superblock.
1034 * It is always aligned to a 4K boundary and
1035 * depeding on minor_version, it can be:
1036 * 0: At least 8K, but less than 12K, from end of device
1037 * 1: At start of device
1038 * 2: 4K from start of device.
1040 switch(minor_version) {
1042 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1044 sb_offset &= ~(sector_t)(4*2-1);
1045 /* convert from sectors to K */
1057 rdev->sb_offset = sb_offset;
1059 /* superblock is rarely larger than 1K, but it can be larger,
1060 * and it is safe to read 4k, so we do that
1062 ret = read_disk_sb(rdev, 4096);
1063 if (ret) return ret;
1066 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1068 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1069 sb->major_version != cpu_to_le32(1) ||
1070 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1071 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1072 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1075 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1076 printk("md: invalid superblock checksum on %s\n",
1077 bdevname(rdev->bdev,b));
1080 if (le64_to_cpu(sb->data_size) < 10) {
1081 printk("md: data_size too small on %s\n",
1082 bdevname(rdev->bdev,b));
1085 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1086 if (sb->level != cpu_to_le32(1) &&
1087 sb->level != cpu_to_le32(4) &&
1088 sb->level != cpu_to_le32(5) &&
1089 sb->level != cpu_to_le32(6) &&
1090 sb->level != cpu_to_le32(10)) {
1092 "md: bitmaps not supported for this level.\n");
1097 rdev->preferred_minor = 0xffff;
1098 rdev->data_offset = le64_to_cpu(sb->data_offset);
1099 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1101 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1102 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1103 if (rdev->sb_size & bmask)
1104 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1106 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1109 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1115 struct mdp_superblock_1 *refsb =
1116 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1118 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1119 sb->level != refsb->level ||
1120 sb->layout != refsb->layout ||
1121 sb->chunksize != refsb->chunksize) {
1122 printk(KERN_WARNING "md: %s has strangely different"
1123 " superblock to %s\n",
1124 bdevname(rdev->bdev,b),
1125 bdevname(refdev->bdev,b2));
1128 ev1 = le64_to_cpu(sb->events);
1129 ev2 = le64_to_cpu(refsb->events);
1137 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1139 rdev->size = rdev->sb_offset;
1140 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1142 rdev->size = le64_to_cpu(sb->data_size)/2;
1143 if (le32_to_cpu(sb->chunksize))
1144 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1146 if (le64_to_cpu(sb->size) > rdev->size*2)
1151 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1153 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1154 __u64 ev1 = le64_to_cpu(sb->events);
1156 rdev->raid_disk = -1;
1158 if (mddev->raid_disks == 0) {
1159 mddev->major_version = 1;
1160 mddev->patch_version = 0;
1161 mddev->external = 0;
1162 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1163 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1164 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1165 mddev->level = le32_to_cpu(sb->level);
1166 mddev->clevel[0] = 0;
1167 mddev->layout = le32_to_cpu(sb->layout);
1168 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1169 mddev->size = le64_to_cpu(sb->size)/2;
1170 mddev->events = ev1;
1171 mddev->bitmap_offset = 0;
1172 mddev->default_bitmap_offset = 1024 >> 9;
1174 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1175 memcpy(mddev->uuid, sb->set_uuid, 16);
1177 mddev->max_disks = (4096-256)/2;
1179 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1180 mddev->bitmap_file == NULL )
1181 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1183 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1184 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1185 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1186 mddev->new_level = le32_to_cpu(sb->new_level);
1187 mddev->new_layout = le32_to_cpu(sb->new_layout);
1188 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1190 mddev->reshape_position = MaxSector;
1191 mddev->delta_disks = 0;
1192 mddev->new_level = mddev->level;
1193 mddev->new_layout = mddev->layout;
1194 mddev->new_chunk = mddev->chunk_size;
1197 } else if (mddev->pers == NULL) {
1198 /* Insist of good event counter while assembling */
1200 if (ev1 < mddev->events)
1202 } else if (mddev->bitmap) {
1203 /* If adding to array with a bitmap, then we can accept an
1204 * older device, but not too old.
1206 if (ev1 < mddev->bitmap->events_cleared)
1209 if (ev1 < mddev->events)
1210 /* just a hot-add of a new device, leave raid_disk at -1 */
1213 if (mddev->level != LEVEL_MULTIPATH) {
1215 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1217 case 0xffff: /* spare */
1219 case 0xfffe: /* faulty */
1220 set_bit(Faulty, &rdev->flags);
1223 if ((le32_to_cpu(sb->feature_map) &
1224 MD_FEATURE_RECOVERY_OFFSET))
1225 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1227 set_bit(In_sync, &rdev->flags);
1228 rdev->raid_disk = role;
1231 if (sb->devflags & WriteMostly1)
1232 set_bit(WriteMostly, &rdev->flags);
1233 } else /* MULTIPATH are always insync */
1234 set_bit(In_sync, &rdev->flags);
1239 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1241 struct mdp_superblock_1 *sb;
1242 struct list_head *tmp;
1245 /* make rdev->sb match mddev and rdev data. */
1247 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1249 sb->feature_map = 0;
1251 sb->recovery_offset = cpu_to_le64(0);
1252 memset(sb->pad1, 0, sizeof(sb->pad1));
1253 memset(sb->pad2, 0, sizeof(sb->pad2));
1254 memset(sb->pad3, 0, sizeof(sb->pad3));
1256 sb->utime = cpu_to_le64((__u64)mddev->utime);
1257 sb->events = cpu_to_le64(mddev->events);
1259 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1261 sb->resync_offset = cpu_to_le64(0);
1263 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1265 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1266 sb->size = cpu_to_le64(mddev->size<<1);
1268 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1269 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1270 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1273 if (rdev->raid_disk >= 0 &&
1274 !test_bit(In_sync, &rdev->flags) &&
1275 rdev->recovery_offset > 0) {
1276 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1277 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1280 if (mddev->reshape_position != MaxSector) {
1281 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1282 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1283 sb->new_layout = cpu_to_le32(mddev->new_layout);
1284 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1285 sb->new_level = cpu_to_le32(mddev->new_level);
1286 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1290 ITERATE_RDEV(mddev,rdev2,tmp)
1291 if (rdev2->desc_nr+1 > max_dev)
1292 max_dev = rdev2->desc_nr+1;
1294 if (max_dev > le32_to_cpu(sb->max_dev))
1295 sb->max_dev = cpu_to_le32(max_dev);
1296 for (i=0; i<max_dev;i++)
1297 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1299 ITERATE_RDEV(mddev,rdev2,tmp) {
1301 if (test_bit(Faulty, &rdev2->flags))
1302 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1303 else if (test_bit(In_sync, &rdev2->flags))
1304 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1305 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1306 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1308 sb->dev_roles[i] = cpu_to_le16(0xffff);
1311 sb->sb_csum = calc_sb_1_csum(sb);
1315 static struct super_type super_types[] = {
1318 .owner = THIS_MODULE,
1319 .load_super = super_90_load,
1320 .validate_super = super_90_validate,
1321 .sync_super = super_90_sync,
1325 .owner = THIS_MODULE,
1326 .load_super = super_1_load,
1327 .validate_super = super_1_validate,
1328 .sync_super = super_1_sync,
1332 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1334 struct list_head *tmp, *tmp2;
1335 mdk_rdev_t *rdev, *rdev2;
1337 ITERATE_RDEV(mddev1,rdev,tmp)
1338 ITERATE_RDEV(mddev2, rdev2, tmp2)
1339 if (rdev->bdev->bd_contains ==
1340 rdev2->bdev->bd_contains)
1346 static LIST_HEAD(pending_raid_disks);
1348 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1350 char b[BDEVNAME_SIZE];
1359 /* make sure rdev->size exceeds mddev->size */
1360 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1362 /* Cannot change size, so fail
1363 * If mddev->level <= 0, then we don't care
1364 * about aligning sizes (e.g. linear)
1366 if (mddev->level > 0)
1369 mddev->size = rdev->size;
1372 /* Verify rdev->desc_nr is unique.
1373 * If it is -1, assign a free number, else
1374 * check number is not in use
1376 if (rdev->desc_nr < 0) {
1378 if (mddev->pers) choice = mddev->raid_disks;
1379 while (find_rdev_nr(mddev, choice))
1381 rdev->desc_nr = choice;
1383 if (find_rdev_nr(mddev, rdev->desc_nr))
1386 bdevname(rdev->bdev,b);
1387 while ( (s=strchr(b, '/')) != NULL)
1390 rdev->mddev = mddev;
1391 printk(KERN_INFO "md: bind<%s>\n", b);
1393 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1396 if (rdev->bdev->bd_part)
1397 ko = &rdev->bdev->bd_part->dev.kobj;
1399 ko = &rdev->bdev->bd_disk->dev.kobj;
1400 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1401 kobject_del(&rdev->kobj);
1404 list_add(&rdev->same_set, &mddev->disks);
1405 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1409 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1414 static void delayed_delete(struct work_struct *ws)
1416 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1417 kobject_del(&rdev->kobj);
1420 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1422 char b[BDEVNAME_SIZE];
1427 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1428 list_del_init(&rdev->same_set);
1429 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1431 sysfs_remove_link(&rdev->kobj, "block");
1433 /* We need to delay this, otherwise we can deadlock when
1434 * writing to 'remove' to "dev/state"
1436 INIT_WORK(&rdev->del_work, delayed_delete);
1437 schedule_work(&rdev->del_work);
1441 * prevent the device from being mounted, repartitioned or
1442 * otherwise reused by a RAID array (or any other kernel
1443 * subsystem), by bd_claiming the device.
1445 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1448 struct block_device *bdev;
1449 char b[BDEVNAME_SIZE];
1451 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1453 printk(KERN_ERR "md: could not open %s.\n",
1454 __bdevname(dev, b));
1455 return PTR_ERR(bdev);
1457 err = bd_claim(bdev, rdev);
1459 printk(KERN_ERR "md: could not bd_claim %s.\n",
1468 static void unlock_rdev(mdk_rdev_t *rdev)
1470 struct block_device *bdev = rdev->bdev;
1478 void md_autodetect_dev(dev_t dev);
1480 static void export_rdev(mdk_rdev_t * rdev)
1482 char b[BDEVNAME_SIZE];
1483 printk(KERN_INFO "md: export_rdev(%s)\n",
1484 bdevname(rdev->bdev,b));
1488 list_del_init(&rdev->same_set);
1490 md_autodetect_dev(rdev->bdev->bd_dev);
1493 kobject_put(&rdev->kobj);
1496 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1498 unbind_rdev_from_array(rdev);
1502 static void export_array(mddev_t *mddev)
1504 struct list_head *tmp;
1507 ITERATE_RDEV(mddev,rdev,tmp) {
1512 kick_rdev_from_array(rdev);
1514 if (!list_empty(&mddev->disks))
1516 mddev->raid_disks = 0;
1517 mddev->major_version = 0;
1520 static void print_desc(mdp_disk_t *desc)
1522 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1523 desc->major,desc->minor,desc->raid_disk,desc->state);
1526 static void print_sb(mdp_super_t *sb)
1531 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1532 sb->major_version, sb->minor_version, sb->patch_version,
1533 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1535 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1536 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1537 sb->md_minor, sb->layout, sb->chunk_size);
1538 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1539 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1540 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1541 sb->failed_disks, sb->spare_disks,
1542 sb->sb_csum, (unsigned long)sb->events_lo);
1545 for (i = 0; i < MD_SB_DISKS; i++) {
1548 desc = sb->disks + i;
1549 if (desc->number || desc->major || desc->minor ||
1550 desc->raid_disk || (desc->state && (desc->state != 4))) {
1551 printk(" D %2d: ", i);
1555 printk(KERN_INFO "md: THIS: ");
1556 print_desc(&sb->this_disk);
1560 static void print_rdev(mdk_rdev_t *rdev)
1562 char b[BDEVNAME_SIZE];
1563 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1564 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1565 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1567 if (rdev->sb_loaded) {
1568 printk(KERN_INFO "md: rdev superblock:\n");
1569 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1571 printk(KERN_INFO "md: no rdev superblock!\n");
1574 static void md_print_devices(void)
1576 struct list_head *tmp, *tmp2;
1579 char b[BDEVNAME_SIZE];
1582 printk("md: **********************************\n");
1583 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1584 printk("md: **********************************\n");
1585 ITERATE_MDDEV(mddev,tmp) {
1588 bitmap_print_sb(mddev->bitmap);
1590 printk("%s: ", mdname(mddev));
1591 ITERATE_RDEV(mddev,rdev,tmp2)
1592 printk("<%s>", bdevname(rdev->bdev,b));
1595 ITERATE_RDEV(mddev,rdev,tmp2)
1598 printk("md: **********************************\n");
1603 static void sync_sbs(mddev_t * mddev, int nospares)
1605 /* Update each superblock (in-memory image), but
1606 * if we are allowed to, skip spares which already
1607 * have the right event counter, or have one earlier
1608 * (which would mean they aren't being marked as dirty
1609 * with the rest of the array)
1612 struct list_head *tmp;
1614 ITERATE_RDEV(mddev,rdev,tmp) {
1615 if (rdev->sb_events == mddev->events ||
1617 rdev->raid_disk < 0 &&
1618 (rdev->sb_events&1)==0 &&
1619 rdev->sb_events+1 == mddev->events)) {
1620 /* Don't update this superblock */
1621 rdev->sb_loaded = 2;
1623 super_types[mddev->major_version].
1624 sync_super(mddev, rdev);
1625 rdev->sb_loaded = 1;
1630 static void md_update_sb(mddev_t * mddev, int force_change)
1632 struct list_head *tmp;
1638 spin_lock_irq(&mddev->write_lock);
1640 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1641 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1643 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1644 /* just a clean<-> dirty transition, possibly leave spares alone,
1645 * though if events isn't the right even/odd, we will have to do
1651 if (mddev->degraded)
1652 /* If the array is degraded, then skipping spares is both
1653 * dangerous and fairly pointless.
1654 * Dangerous because a device that was removed from the array
1655 * might have a event_count that still looks up-to-date,
1656 * so it can be re-added without a resync.
1657 * Pointless because if there are any spares to skip,
1658 * then a recovery will happen and soon that array won't
1659 * be degraded any more and the spare can go back to sleep then.
1663 sync_req = mddev->in_sync;
1664 mddev->utime = get_seconds();
1666 /* If this is just a dirty<->clean transition, and the array is clean
1667 * and 'events' is odd, we can roll back to the previous clean state */
1669 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1670 && (mddev->events & 1)
1671 && mddev->events != 1)
1674 /* otherwise we have to go forward and ... */
1676 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1677 /* .. if the array isn't clean, insist on an odd 'events' */
1678 if ((mddev->events&1)==0) {
1683 /* otherwise insist on an even 'events' (for clean states) */
1684 if ((mddev->events&1)) {
1691 if (!mddev->events) {
1693 * oops, this 64-bit counter should never wrap.
1694 * Either we are in around ~1 trillion A.C., assuming
1695 * 1 reboot per second, or we have a bug:
1702 * do not write anything to disk if using
1703 * nonpersistent superblocks
1705 if (!mddev->persistent) {
1706 if (!mddev->external)
1707 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1709 spin_unlock_irq(&mddev->write_lock);
1710 wake_up(&mddev->sb_wait);
1713 sync_sbs(mddev, nospares);
1714 spin_unlock_irq(&mddev->write_lock);
1717 "md: updating %s RAID superblock on device (in sync %d)\n",
1718 mdname(mddev),mddev->in_sync);
1720 bitmap_update_sb(mddev->bitmap);
1721 ITERATE_RDEV(mddev,rdev,tmp) {
1722 char b[BDEVNAME_SIZE];
1723 dprintk(KERN_INFO "md: ");
1724 if (rdev->sb_loaded != 1)
1725 continue; /* no noise on spare devices */
1726 if (test_bit(Faulty, &rdev->flags))
1727 dprintk("(skipping faulty ");
1729 dprintk("%s ", bdevname(rdev->bdev,b));
1730 if (!test_bit(Faulty, &rdev->flags)) {
1731 md_super_write(mddev,rdev,
1732 rdev->sb_offset<<1, rdev->sb_size,
1734 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1735 bdevname(rdev->bdev,b),
1736 (unsigned long long)rdev->sb_offset);
1737 rdev->sb_events = mddev->events;
1741 if (mddev->level == LEVEL_MULTIPATH)
1742 /* only need to write one superblock... */
1745 md_super_wait(mddev);
1746 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1748 spin_lock_irq(&mddev->write_lock);
1749 if (mddev->in_sync != sync_req ||
1750 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1751 /* have to write it out again */
1752 spin_unlock_irq(&mddev->write_lock);
1755 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1756 spin_unlock_irq(&mddev->write_lock);
1757 wake_up(&mddev->sb_wait);
1761 /* words written to sysfs files may, or my not, be \n terminated.
1762 * We want to accept with case. For this we use cmd_match.
1764 static int cmd_match(const char *cmd, const char *str)
1766 /* See if cmd, written into a sysfs file, matches
1767 * str. They must either be the same, or cmd can
1768 * have a trailing newline
1770 while (*cmd && *str && *cmd == *str) {
1781 struct rdev_sysfs_entry {
1782 struct attribute attr;
1783 ssize_t (*show)(mdk_rdev_t *, char *);
1784 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1788 state_show(mdk_rdev_t *rdev, char *page)
1793 if (test_bit(Faulty, &rdev->flags)) {
1794 len+= sprintf(page+len, "%sfaulty",sep);
1797 if (test_bit(In_sync, &rdev->flags)) {
1798 len += sprintf(page+len, "%sin_sync",sep);
1801 if (test_bit(WriteMostly, &rdev->flags)) {
1802 len += sprintf(page+len, "%swrite_mostly",sep);
1805 if (!test_bit(Faulty, &rdev->flags) &&
1806 !test_bit(In_sync, &rdev->flags)) {
1807 len += sprintf(page+len, "%sspare", sep);
1810 return len+sprintf(page+len, "\n");
1814 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1817 * faulty - simulates and error
1818 * remove - disconnects the device
1819 * writemostly - sets write_mostly
1820 * -writemostly - clears write_mostly
1823 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1824 md_error(rdev->mddev, rdev);
1826 } else if (cmd_match(buf, "remove")) {
1827 if (rdev->raid_disk >= 0)
1830 mddev_t *mddev = rdev->mddev;
1831 kick_rdev_from_array(rdev);
1833 md_update_sb(mddev, 1);
1834 md_new_event(mddev);
1837 } else if (cmd_match(buf, "writemostly")) {
1838 set_bit(WriteMostly, &rdev->flags);
1840 } else if (cmd_match(buf, "-writemostly")) {
1841 clear_bit(WriteMostly, &rdev->flags);
1844 return err ? err : len;
1846 static struct rdev_sysfs_entry rdev_state =
1847 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1850 super_show(mdk_rdev_t *rdev, char *page)
1852 if (rdev->sb_loaded && rdev->sb_size) {
1853 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1854 return rdev->sb_size;
1858 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1861 errors_show(mdk_rdev_t *rdev, char *page)
1863 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1867 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1870 unsigned long n = simple_strtoul(buf, &e, 10);
1871 if (*buf && (*e == 0 || *e == '\n')) {
1872 atomic_set(&rdev->corrected_errors, n);
1877 static struct rdev_sysfs_entry rdev_errors =
1878 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1881 slot_show(mdk_rdev_t *rdev, char *page)
1883 if (rdev->raid_disk < 0)
1884 return sprintf(page, "none\n");
1886 return sprintf(page, "%d\n", rdev->raid_disk);
1890 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1895 int slot = simple_strtoul(buf, &e, 10);
1896 if (strncmp(buf, "none", 4)==0)
1898 else if (e==buf || (*e && *e!= '\n'))
1900 if (rdev->mddev->pers) {
1901 /* Setting 'slot' on an active array requires also
1902 * updating the 'rd%d' link, and communicating
1903 * with the personality with ->hot_*_disk.
1904 * For now we only support removing
1905 * failed/spare devices. This normally happens automatically,
1906 * but not when the metadata is externally managed.
1910 if (rdev->raid_disk == -1)
1912 /* personality does all needed checks */
1913 if (rdev->mddev->pers->hot_add_disk == NULL)
1915 err = rdev->mddev->pers->
1916 hot_remove_disk(rdev->mddev, rdev->raid_disk);
1919 sprintf(nm, "rd%d", rdev->raid_disk);
1920 sysfs_remove_link(&rdev->mddev->kobj, nm);
1921 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1922 md_wakeup_thread(rdev->mddev->thread);
1924 if (slot >= rdev->mddev->raid_disks)
1926 rdev->raid_disk = slot;
1927 /* assume it is working */
1929 set_bit(In_sync, &rdev->flags);
1935 static struct rdev_sysfs_entry rdev_slot =
1936 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
1939 offset_show(mdk_rdev_t *rdev, char *page)
1941 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1945 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1948 unsigned long long offset = simple_strtoull(buf, &e, 10);
1949 if (e==buf || (*e && *e != '\n'))
1951 if (rdev->mddev->pers)
1953 rdev->data_offset = offset;
1957 static struct rdev_sysfs_entry rdev_offset =
1958 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
1961 rdev_size_show(mdk_rdev_t *rdev, char *page)
1963 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1967 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1970 unsigned long long size = simple_strtoull(buf, &e, 10);
1971 if (e==buf || (*e && *e != '\n'))
1973 if (rdev->mddev->pers)
1976 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1977 rdev->mddev->size = size;
1981 static struct rdev_sysfs_entry rdev_size =
1982 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
1984 static struct attribute *rdev_default_attrs[] = {
1994 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1996 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1997 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2001 return entry->show(rdev, page);
2005 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2006 const char *page, size_t length)
2008 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2009 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2013 if (!capable(CAP_SYS_ADMIN))
2015 return entry->store(rdev, page, length);
2018 static void rdev_free(struct kobject *ko)
2020 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2023 static struct sysfs_ops rdev_sysfs_ops = {
2024 .show = rdev_attr_show,
2025 .store = rdev_attr_store,
2027 static struct kobj_type rdev_ktype = {
2028 .release = rdev_free,
2029 .sysfs_ops = &rdev_sysfs_ops,
2030 .default_attrs = rdev_default_attrs,
2034 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2036 * mark the device faulty if:
2038 * - the device is nonexistent (zero size)
2039 * - the device has no valid superblock
2041 * a faulty rdev _never_ has rdev->sb set.
2043 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2045 char b[BDEVNAME_SIZE];
2050 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2052 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2053 return ERR_PTR(-ENOMEM);
2056 if ((err = alloc_disk_sb(rdev)))
2059 err = lock_rdev(rdev, newdev);
2063 kobject_init(&rdev->kobj, &rdev_ktype);
2066 rdev->saved_raid_disk = -1;
2067 rdev->raid_disk = -1;
2069 rdev->data_offset = 0;
2070 rdev->sb_events = 0;
2071 atomic_set(&rdev->nr_pending, 0);
2072 atomic_set(&rdev->read_errors, 0);
2073 atomic_set(&rdev->corrected_errors, 0);
2075 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2078 "md: %s has zero or unknown size, marking faulty!\n",
2079 bdevname(rdev->bdev,b));
2084 if (super_format >= 0) {
2085 err = super_types[super_format].
2086 load_super(rdev, NULL, super_minor);
2087 if (err == -EINVAL) {
2089 "md: %s does not have a valid v%d.%d "
2090 "superblock, not importing!\n",
2091 bdevname(rdev->bdev,b),
2092 super_format, super_minor);
2097 "md: could not read %s's sb, not importing!\n",
2098 bdevname(rdev->bdev,b));
2102 INIT_LIST_HEAD(&rdev->same_set);
2107 if (rdev->sb_page) {
2113 return ERR_PTR(err);
2117 * Check a full RAID array for plausibility
2121 static void analyze_sbs(mddev_t * mddev)
2124 struct list_head *tmp;
2125 mdk_rdev_t *rdev, *freshest;
2126 char b[BDEVNAME_SIZE];
2129 ITERATE_RDEV(mddev,rdev,tmp)
2130 switch (super_types[mddev->major_version].
2131 load_super(rdev, freshest, mddev->minor_version)) {
2139 "md: fatal superblock inconsistency in %s"
2140 " -- removing from array\n",
2141 bdevname(rdev->bdev,b));
2142 kick_rdev_from_array(rdev);
2146 super_types[mddev->major_version].
2147 validate_super(mddev, freshest);
2150 ITERATE_RDEV(mddev,rdev,tmp) {
2151 if (rdev != freshest)
2152 if (super_types[mddev->major_version].
2153 validate_super(mddev, rdev)) {
2154 printk(KERN_WARNING "md: kicking non-fresh %s"
2156 bdevname(rdev->bdev,b));
2157 kick_rdev_from_array(rdev);
2160 if (mddev->level == LEVEL_MULTIPATH) {
2161 rdev->desc_nr = i++;
2162 rdev->raid_disk = rdev->desc_nr;
2163 set_bit(In_sync, &rdev->flags);
2164 } else if (rdev->raid_disk >= mddev->raid_disks) {
2165 rdev->raid_disk = -1;
2166 clear_bit(In_sync, &rdev->flags);
2172 if (mddev->recovery_cp != MaxSector &&
2174 printk(KERN_ERR "md: %s: raid array is not clean"
2175 " -- starting background reconstruction\n",
2181 safe_delay_show(mddev_t *mddev, char *page)
2183 int msec = (mddev->safemode_delay*1000)/HZ;
2184 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2187 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2195 /* remove a period, and count digits after it */
2196 if (len >= sizeof(buf))
2198 strlcpy(buf, cbuf, len);
2200 for (i=0; i<len; i++) {
2202 if (isdigit(buf[i])) {
2207 } else if (buf[i] == '.') {
2212 msec = simple_strtoul(buf, &e, 10);
2213 if (e == buf || (*e && *e != '\n'))
2215 msec = (msec * 1000) / scale;
2217 mddev->safemode_delay = 0;
2219 mddev->safemode_delay = (msec*HZ)/1000;
2220 if (mddev->safemode_delay == 0)
2221 mddev->safemode_delay = 1;
2225 static struct md_sysfs_entry md_safe_delay =
2226 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2229 level_show(mddev_t *mddev, char *page)
2231 struct mdk_personality *p = mddev->pers;
2233 return sprintf(page, "%s\n", p->name);
2234 else if (mddev->clevel[0])
2235 return sprintf(page, "%s\n", mddev->clevel);
2236 else if (mddev->level != LEVEL_NONE)
2237 return sprintf(page, "%d\n", mddev->level);
2243 level_store(mddev_t *mddev, const char *buf, size_t len)
2250 if (len >= sizeof(mddev->clevel))
2252 strncpy(mddev->clevel, buf, len);
2253 if (mddev->clevel[len-1] == '\n')
2255 mddev->clevel[len] = 0;
2256 mddev->level = LEVEL_NONE;
2260 static struct md_sysfs_entry md_level =
2261 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2265 layout_show(mddev_t *mddev, char *page)
2267 /* just a number, not meaningful for all levels */
2268 if (mddev->reshape_position != MaxSector &&
2269 mddev->layout != mddev->new_layout)
2270 return sprintf(page, "%d (%d)\n",
2271 mddev->new_layout, mddev->layout);
2272 return sprintf(page, "%d\n", mddev->layout);
2276 layout_store(mddev_t *mddev, const char *buf, size_t len)
2279 unsigned long n = simple_strtoul(buf, &e, 10);
2281 if (!*buf || (*e && *e != '\n'))
2286 if (mddev->reshape_position != MaxSector)
2287 mddev->new_layout = n;
2292 static struct md_sysfs_entry md_layout =
2293 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2297 raid_disks_show(mddev_t *mddev, char *page)
2299 if (mddev->raid_disks == 0)
2301 if (mddev->reshape_position != MaxSector &&
2302 mddev->delta_disks != 0)
2303 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2304 mddev->raid_disks - mddev->delta_disks);
2305 return sprintf(page, "%d\n", mddev->raid_disks);
2308 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2311 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2315 unsigned long n = simple_strtoul(buf, &e, 10);
2317 if (!*buf || (*e && *e != '\n'))
2321 rv = update_raid_disks(mddev, n);
2322 else if (mddev->reshape_position != MaxSector) {
2323 int olddisks = mddev->raid_disks - mddev->delta_disks;
2324 mddev->delta_disks = n - olddisks;
2325 mddev->raid_disks = n;
2327 mddev->raid_disks = n;
2328 return rv ? rv : len;
2330 static struct md_sysfs_entry md_raid_disks =
2331 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2334 chunk_size_show(mddev_t *mddev, char *page)
2336 if (mddev->reshape_position != MaxSector &&
2337 mddev->chunk_size != mddev->new_chunk)
2338 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2340 return sprintf(page, "%d\n", mddev->chunk_size);
2344 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2346 /* can only set chunk_size if array is not yet active */
2348 unsigned long n = simple_strtoul(buf, &e, 10);
2350 if (!*buf || (*e && *e != '\n'))
2355 else if (mddev->reshape_position != MaxSector)
2356 mddev->new_chunk = n;
2358 mddev->chunk_size = n;
2361 static struct md_sysfs_entry md_chunk_size =
2362 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2365 resync_start_show(mddev_t *mddev, char *page)
2367 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2371 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2373 /* can only set chunk_size if array is not yet active */
2375 unsigned long long n = simple_strtoull(buf, &e, 10);
2379 if (!*buf || (*e && *e != '\n'))
2382 mddev->recovery_cp = n;
2385 static struct md_sysfs_entry md_resync_start =
2386 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2389 * The array state can be:
2392 * No devices, no size, no level
2393 * Equivalent to STOP_ARRAY ioctl
2395 * May have some settings, but array is not active
2396 * all IO results in error
2397 * When written, doesn't tear down array, but just stops it
2398 * suspended (not supported yet)
2399 * All IO requests will block. The array can be reconfigured.
2400 * Writing this, if accepted, will block until array is quiessent
2402 * no resync can happen. no superblocks get written.
2403 * write requests fail
2405 * like readonly, but behaves like 'clean' on a write request.
2407 * clean - no pending writes, but otherwise active.
2408 * When written to inactive array, starts without resync
2409 * If a write request arrives then
2410 * if metadata is known, mark 'dirty' and switch to 'active'.
2411 * if not known, block and switch to write-pending
2412 * If written to an active array that has pending writes, then fails.
2414 * fully active: IO and resync can be happening.
2415 * When written to inactive array, starts with resync
2418 * clean, but writes are blocked waiting for 'active' to be written.
2421 * like active, but no writes have been seen for a while (100msec).
2424 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2425 write_pending, active_idle, bad_word};
2426 static char *array_states[] = {
2427 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2428 "write-pending", "active-idle", NULL };
2430 static int match_word(const char *word, char **list)
2433 for (n=0; list[n]; n++)
2434 if (cmd_match(word, list[n]))
2440 array_state_show(mddev_t *mddev, char *page)
2442 enum array_state st = inactive;
2455 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2457 else if (mddev->safemode)
2463 if (list_empty(&mddev->disks) &&
2464 mddev->raid_disks == 0 &&
2470 return sprintf(page, "%s\n", array_states[st]);
2473 static int do_md_stop(mddev_t * mddev, int ro);
2474 static int do_md_run(mddev_t * mddev);
2475 static int restart_array(mddev_t *mddev);
2478 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2481 enum array_state st = match_word(buf, array_states);
2486 /* stopping an active array */
2487 if (atomic_read(&mddev->active) > 1)
2489 err = do_md_stop(mddev, 0);
2492 /* stopping an active array */
2494 if (atomic_read(&mddev->active) > 1)
2496 err = do_md_stop(mddev, 2);
2498 err = 0; /* already inactive */
2501 break; /* not supported yet */
2504 err = do_md_stop(mddev, 1);
2507 err = do_md_run(mddev);
2511 /* stopping an active array */
2513 err = do_md_stop(mddev, 1);
2515 mddev->ro = 2; /* FIXME mark devices writable */
2518 err = do_md_run(mddev);
2523 restart_array(mddev);
2524 spin_lock_irq(&mddev->write_lock);
2525 if (atomic_read(&mddev->writes_pending) == 0) {
2526 if (mddev->in_sync == 0) {
2528 if (mddev->persistent)
2529 set_bit(MD_CHANGE_CLEAN,
2535 spin_unlock_irq(&mddev->write_lock);
2538 mddev->recovery_cp = MaxSector;
2539 err = do_md_run(mddev);
2544 restart_array(mddev);
2545 if (mddev->external)
2546 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2547 wake_up(&mddev->sb_wait);
2551 err = do_md_run(mddev);
2556 /* these cannot be set */
2564 static struct md_sysfs_entry md_array_state =
2565 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2568 null_show(mddev_t *mddev, char *page)
2574 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2576 /* buf must be %d:%d\n? giving major and minor numbers */
2577 /* The new device is added to the array.
2578 * If the array has a persistent superblock, we read the
2579 * superblock to initialise info and check validity.
2580 * Otherwise, only checking done is that in bind_rdev_to_array,
2581 * which mainly checks size.
2584 int major = simple_strtoul(buf, &e, 10);
2590 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2592 minor = simple_strtoul(e+1, &e, 10);
2593 if (*e && *e != '\n')
2595 dev = MKDEV(major, minor);
2596 if (major != MAJOR(dev) ||
2597 minor != MINOR(dev))
2601 if (mddev->persistent) {
2602 rdev = md_import_device(dev, mddev->major_version,
2603 mddev->minor_version);
2604 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2605 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2606 mdk_rdev_t, same_set);
2607 err = super_types[mddev->major_version]
2608 .load_super(rdev, rdev0, mddev->minor_version);
2613 rdev = md_import_device(dev, -1, -1);
2616 return PTR_ERR(rdev);
2617 err = bind_rdev_to_array(rdev, mddev);
2621 return err ? err : len;
2624 static struct md_sysfs_entry md_new_device =
2625 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2628 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2631 unsigned long chunk, end_chunk;
2635 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2637 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2638 if (buf == end) break;
2639 if (*end == '-') { /* range */
2641 end_chunk = simple_strtoul(buf, &end, 0);
2642 if (buf == end) break;
2644 if (*end && !isspace(*end)) break;
2645 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2647 while (isspace(*buf)) buf++;
2649 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2654 static struct md_sysfs_entry md_bitmap =
2655 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2658 size_show(mddev_t *mddev, char *page)
2660 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2663 static int update_size(mddev_t *mddev, unsigned long size);
2666 size_store(mddev_t *mddev, const char *buf, size_t len)
2668 /* If array is inactive, we can reduce the component size, but
2669 * not increase it (except from 0).
2670 * If array is active, we can try an on-line resize
2674 unsigned long long size = simple_strtoull(buf, &e, 10);
2675 if (!*buf || *buf == '\n' ||
2680 err = update_size(mddev, size);
2681 md_update_sb(mddev, 1);
2683 if (mddev->size == 0 ||
2689 return err ? err : len;
2692 static struct md_sysfs_entry md_size =
2693 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2698 * 'none' for arrays with no metadata (good luck...)
2699 * 'external' for arrays with externally managed metadata,
2700 * or N.M for internally known formats
2703 metadata_show(mddev_t *mddev, char *page)
2705 if (mddev->persistent)
2706 return sprintf(page, "%d.%d\n",
2707 mddev->major_version, mddev->minor_version);
2708 else if (mddev->external)
2709 return sprintf(page, "external:%s\n", mddev->metadata_type);
2711 return sprintf(page, "none\n");
2715 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2719 if (!list_empty(&mddev->disks))
2722 if (cmd_match(buf, "none")) {
2723 mddev->persistent = 0;
2724 mddev->external = 0;
2725 mddev->major_version = 0;
2726 mddev->minor_version = 90;
2729 if (strncmp(buf, "external:", 9) == 0) {
2730 int namelen = len-9;
2731 if (namelen >= sizeof(mddev->metadata_type))
2732 namelen = sizeof(mddev->metadata_type)-1;
2733 strncpy(mddev->metadata_type, buf+9, namelen);
2734 mddev->metadata_type[namelen] = 0;
2735 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2736 mddev->metadata_type[--namelen] = 0;
2737 mddev->persistent = 0;
2738 mddev->external = 1;
2739 mddev->major_version = 0;
2740 mddev->minor_version = 90;
2743 major = simple_strtoul(buf, &e, 10);
2744 if (e==buf || *e != '.')
2747 minor = simple_strtoul(buf, &e, 10);
2748 if (e==buf || (*e && *e != '\n') )
2750 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2752 mddev->major_version = major;
2753 mddev->minor_version = minor;
2754 mddev->persistent = 1;
2755 mddev->external = 0;
2759 static struct md_sysfs_entry md_metadata =
2760 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2763 action_show(mddev_t *mddev, char *page)
2765 char *type = "idle";
2766 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2767 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2768 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2770 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2771 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2773 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2780 return sprintf(page, "%s\n", type);
2784 action_store(mddev_t *mddev, const char *page, size_t len)
2786 if (!mddev->pers || !mddev->pers->sync_request)
2789 if (cmd_match(page, "idle")) {
2790 if (mddev->sync_thread) {
2791 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2792 md_unregister_thread(mddev->sync_thread);
2793 mddev->sync_thread = NULL;
2794 mddev->recovery = 0;
2796 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2797 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2799 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2800 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2801 else if (cmd_match(page, "reshape")) {
2803 if (mddev->pers->start_reshape == NULL)
2805 err = mddev->pers->start_reshape(mddev);
2809 if (cmd_match(page, "check"))
2810 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2811 else if (!cmd_match(page, "repair"))
2813 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2814 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2816 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2817 md_wakeup_thread(mddev->thread);
2822 mismatch_cnt_show(mddev_t *mddev, char *page)
2824 return sprintf(page, "%llu\n",
2825 (unsigned long long) mddev->resync_mismatches);
2828 static struct md_sysfs_entry md_scan_mode =
2829 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2832 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
2835 sync_min_show(mddev_t *mddev, char *page)
2837 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2838 mddev->sync_speed_min ? "local": "system");
2842 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2846 if (strncmp(buf, "system", 6)==0) {
2847 mddev->sync_speed_min = 0;
2850 min = simple_strtoul(buf, &e, 10);
2851 if (buf == e || (*e && *e != '\n') || min <= 0)
2853 mddev->sync_speed_min = min;
2857 static struct md_sysfs_entry md_sync_min =
2858 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2861 sync_max_show(mddev_t *mddev, char *page)
2863 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2864 mddev->sync_speed_max ? "local": "system");
2868 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2872 if (strncmp(buf, "system", 6)==0) {
2873 mddev->sync_speed_max = 0;
2876 max = simple_strtoul(buf, &e, 10);
2877 if (buf == e || (*e && *e != '\n') || max <= 0)
2879 mddev->sync_speed_max = max;
2883 static struct md_sysfs_entry md_sync_max =
2884 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2887 degraded_show(mddev_t *mddev, char *page)
2889 return sprintf(page, "%d\n", mddev->degraded);
2891 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
2894 sync_speed_show(mddev_t *mddev, char *page)
2896 unsigned long resync, dt, db;
2897 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
2898 dt = ((jiffies - mddev->resync_mark) / HZ);
2900 db = resync - (mddev->resync_mark_cnt);
2901 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2904 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
2907 sync_completed_show(mddev_t *mddev, char *page)
2909 unsigned long max_blocks, resync;
2911 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2912 max_blocks = mddev->resync_max_sectors;
2914 max_blocks = mddev->size << 1;
2916 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2917 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2920 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
2923 max_sync_show(mddev_t *mddev, char *page)
2925 if (mddev->resync_max == MaxSector)
2926 return sprintf(page, "max\n");
2928 return sprintf(page, "%llu\n",
2929 (unsigned long long)mddev->resync_max);
2932 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
2934 if (strncmp(buf, "max", 3) == 0)
2935 mddev->resync_max = MaxSector;
2938 unsigned long long max = simple_strtoull(buf, &ep, 10);
2939 if (ep == buf || (*ep != 0 && *ep != '\n'))
2941 if (max < mddev->resync_max &&
2942 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
2945 /* Must be a multiple of chunk_size */
2946 if (mddev->chunk_size) {
2947 if (max & (sector_t)((mddev->chunk_size>>9)-1))
2950 mddev->resync_max = max;
2952 wake_up(&mddev->recovery_wait);
2956 static struct md_sysfs_entry md_max_sync =
2957 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
2960 suspend_lo_show(mddev_t *mddev, char *page)
2962 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2966 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2969 unsigned long long new = simple_strtoull(buf, &e, 10);
2971 if (mddev->pers->quiesce == NULL)
2973 if (buf == e || (*e && *e != '\n'))
2975 if (new >= mddev->suspend_hi ||
2976 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2977 mddev->suspend_lo = new;
2978 mddev->pers->quiesce(mddev, 2);
2983 static struct md_sysfs_entry md_suspend_lo =
2984 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2988 suspend_hi_show(mddev_t *mddev, char *page)
2990 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2994 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2997 unsigned long long new = simple_strtoull(buf, &e, 10);
2999 if (mddev->pers->quiesce == NULL)
3001 if (buf == e || (*e && *e != '\n'))
3003 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3004 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3005 mddev->suspend_hi = new;
3006 mddev->pers->quiesce(mddev, 1);
3007 mddev->pers->quiesce(mddev, 0);
3012 static struct md_sysfs_entry md_suspend_hi =
3013 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3016 reshape_position_show(mddev_t *mddev, char *page)
3018 if (mddev->reshape_position != MaxSector)
3019 return sprintf(page, "%llu\n",
3020 (unsigned long long)mddev->reshape_position);
3021 strcpy(page, "none\n");
3026 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3029 unsigned long long new = simple_strtoull(buf, &e, 10);
3032 if (buf == e || (*e && *e != '\n'))
3034 mddev->reshape_position = new;
3035 mddev->delta_disks = 0;
3036 mddev->new_level = mddev->level;
3037 mddev->new_layout = mddev->layout;
3038 mddev->new_chunk = mddev->chunk_size;
3042 static struct md_sysfs_entry md_reshape_position =
3043 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3044 reshape_position_store);
3047 static struct attribute *md_default_attrs[] = {
3050 &md_raid_disks.attr,
3051 &md_chunk_size.attr,
3053 &md_resync_start.attr,
3055 &md_new_device.attr,
3056 &md_safe_delay.attr,
3057 &md_array_state.attr,
3058 &md_reshape_position.attr,
3062 static struct attribute *md_redundancy_attrs[] = {
3064 &md_mismatches.attr,
3067 &md_sync_speed.attr,
3068 &md_sync_completed.attr,
3070 &md_suspend_lo.attr,
3071 &md_suspend_hi.attr,
3076 static struct attribute_group md_redundancy_group = {
3078 .attrs = md_redundancy_attrs,
3083 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3085 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3086 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3091 rv = mddev_lock(mddev);
3093 rv = entry->show(mddev, page);
3094 mddev_unlock(mddev);
3100 md_attr_store(struct kobject *kobj, struct attribute *attr,
3101 const char *page, size_t length)
3103 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3104 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3109 if (!capable(CAP_SYS_ADMIN))
3111 rv = mddev_lock(mddev);
3113 rv = entry->store(mddev, page, length);
3114 mddev_unlock(mddev);
3119 static void md_free(struct kobject *ko)
3121 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3125 static struct sysfs_ops md_sysfs_ops = {
3126 .show = md_attr_show,
3127 .store = md_attr_store,
3129 static struct kobj_type md_ktype = {
3131 .sysfs_ops = &md_sysfs_ops,
3132 .default_attrs = md_default_attrs,
3137 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3139 static DEFINE_MUTEX(disks_mutex);
3140 mddev_t *mddev = mddev_find(dev);
3141 struct gendisk *disk;
3142 int partitioned = (MAJOR(dev) != MD_MAJOR);
3143 int shift = partitioned ? MdpMinorShift : 0;
3144 int unit = MINOR(dev) >> shift;
3150 mutex_lock(&disks_mutex);
3151 if (mddev->gendisk) {
3152 mutex_unlock(&disks_mutex);
3156 disk = alloc_disk(1 << shift);
3158 mutex_unlock(&disks_mutex);
3162 disk->major = MAJOR(dev);
3163 disk->first_minor = unit << shift;
3165 sprintf(disk->disk_name, "md_d%d", unit);
3167 sprintf(disk->disk_name, "md%d", unit);
3168 disk->fops = &md_fops;
3169 disk->private_data = mddev;
3170 disk->queue = mddev->queue;
3172 mddev->gendisk = disk;
3173 mutex_unlock(&disks_mutex);
3174 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3177 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3180 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3184 static void md_safemode_timeout(unsigned long data)
3186 mddev_t *mddev = (mddev_t *) data;
3188 mddev->safemode = 1;
3189 md_wakeup_thread(mddev->thread);
3192 static int start_dirty_degraded;
3194 static int do_md_run(mddev_t * mddev)
3198 struct list_head *tmp;
3200 struct gendisk *disk;
3201 struct mdk_personality *pers;
3202 char b[BDEVNAME_SIZE];
3204 if (list_empty(&mddev->disks))
3205 /* cannot run an array with no devices.. */
3212 * Analyze all RAID superblock(s)
3214 if (!mddev->raid_disks) {
3215 if (!mddev->persistent)
3220 chunk_size = mddev->chunk_size;
3223 if (chunk_size > MAX_CHUNK_SIZE) {
3224 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3225 chunk_size, MAX_CHUNK_SIZE);
3229 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3231 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3232 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3235 if (chunk_size < PAGE_SIZE) {
3236 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3237 chunk_size, PAGE_SIZE);
3241 /* devices must have minimum size of one chunk */
3242 ITERATE_RDEV(mddev,rdev,tmp) {
3243 if (test_bit(Faulty, &rdev->flags))
3245 if (rdev->size < chunk_size / 1024) {
3247 "md: Dev %s smaller than chunk_size:"
3249 bdevname(rdev->bdev,b),
3250 (unsigned long long)rdev->size,
3258 if (mddev->level != LEVEL_NONE)
3259 request_module("md-level-%d", mddev->level);
3260 else if (mddev->clevel[0])
3261 request_module("md-%s", mddev->clevel);
3265 * Drop all container device buffers, from now on
3266 * the only valid external interface is through the md
3269 ITERATE_RDEV(mddev,rdev,tmp) {
3270 if (test_bit(Faulty, &rdev->flags))
3272 sync_blockdev(rdev->bdev);
3273 invalidate_bdev(rdev->bdev);
3275 /* perform some consistency tests on the device.
3276 * We don't want the data to overlap the metadata,
3277 * Internal Bitmap issues has handled elsewhere.
3279 if (rdev->data_offset < rdev->sb_offset) {
3281 rdev->data_offset + mddev->size*2
3282 > rdev->sb_offset*2) {
3283 printk("md: %s: data overlaps metadata\n",
3288 if (rdev->sb_offset*2 + rdev->sb_size/512
3289 > rdev->data_offset) {
3290 printk("md: %s: metadata overlaps data\n",
3297 md_probe(mddev->unit, NULL, NULL);
3298 disk = mddev->gendisk;
3302 spin_lock(&pers_lock);
3303 pers = find_pers(mddev->level, mddev->clevel);
3304 if (!pers || !try_module_get(pers->owner)) {
3305 spin_unlock(&pers_lock);
3306 if (mddev->level != LEVEL_NONE)
3307 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3310 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3315 spin_unlock(&pers_lock);
3316 mddev->level = pers->level;
3317 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3319 if (mddev->reshape_position != MaxSector &&
3320 pers->start_reshape == NULL) {
3321 /* This personality cannot handle reshaping... */
3323 module_put(pers->owner);
3327 if (pers->sync_request) {
3328 /* Warn if this is a potentially silly
3331 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3333 struct list_head *tmp2;
3335 ITERATE_RDEV(mddev, rdev, tmp) {
3336 ITERATE_RDEV(mddev, rdev2, tmp2) {
3338 rdev->bdev->bd_contains ==
3339 rdev2->bdev->bd_contains) {
3341 "%s: WARNING: %s appears to be"
3342 " on the same physical disk as"
3345 bdevname(rdev->bdev,b),
3346 bdevname(rdev2->bdev,b2));
3353 "True protection against single-disk"
3354 " failure might be compromised.\n");
3357 mddev->recovery = 0;
3358 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3359 mddev->barriers_work = 1;
3360 mddev->ok_start_degraded = start_dirty_degraded;
3363 mddev->ro = 2; /* read-only, but switch on first write */
3365 err = mddev->pers->run(mddev);
3366 if (!err && mddev->pers->sync_request) {
3367 err = bitmap_create(mddev);
3369 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3370 mdname(mddev), err);
3371 mddev->pers->stop(mddev);
3375 printk(KERN_ERR "md: pers->run() failed ...\n");
3376 module_put(mddev->pers->owner);
3378 bitmap_destroy(mddev);
3381 if (mddev->pers->sync_request) {
3382 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3384 "md: cannot register extra attributes for %s\n",
3386 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3389 atomic_set(&mddev->writes_pending,0);
3390 mddev->safemode = 0;
3391 mddev->safemode_timer.function = md_safemode_timeout;
3392 mddev->safemode_timer.data = (unsigned long) mddev;
3393 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3396 ITERATE_RDEV(mddev,rdev,tmp)
3397 if (rdev->raid_disk >= 0) {
3399 sprintf(nm, "rd%d", rdev->raid_disk);
3400 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3401 printk("md: cannot register %s for %s\n",
3405 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3408 md_update_sb(mddev, 0);
3410 set_capacity(disk, mddev->array_size<<1);
3412 /* If we call blk_queue_make_request here, it will
3413 * re-initialise max_sectors etc which may have been
3414 * refined inside -> run. So just set the bits we need to set.
3415 * Most initialisation happended when we called
3416 * blk_queue_make_request(..., md_fail_request)
3419 mddev->queue->queuedata = mddev;
3420 mddev->queue->make_request_fn = mddev->pers->make_request;
3422 /* If there is a partially-recovered drive we need to
3423 * start recovery here. If we leave it to md_check_recovery,
3424 * it will remove the drives and not do the right thing
3426 if (mddev->degraded && !mddev->sync_thread) {
3427 struct list_head *rtmp;
3429 ITERATE_RDEV(mddev,rdev,rtmp)
3430 if (rdev->raid_disk >= 0 &&
3431 !test_bit(In_sync, &rdev->flags) &&
3432 !test_bit(Faulty, &rdev->flags))
3433 /* complete an interrupted recovery */
3435 if (spares && mddev->pers->sync_request) {
3436 mddev->recovery = 0;
3437 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3438 mddev->sync_thread = md_register_thread(md_do_sync,
3441 if (!mddev->sync_thread) {
3442 printk(KERN_ERR "%s: could not start resync"
3445 /* leave the spares where they are, it shouldn't hurt */
3446 mddev->recovery = 0;
3450 md_wakeup_thread(mddev->thread);
3451 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3454 md_new_event(mddev);
3455 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
3459 static int restart_array(mddev_t *mddev)
3461 struct gendisk *disk = mddev->gendisk;
3465 * Complain if it has no devices
3468 if (list_empty(&mddev->disks))
3476 mddev->safemode = 0;
3478 set_disk_ro(disk, 0);
3480 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3483 * Kick recovery or resync if necessary
3485 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3486 md_wakeup_thread(mddev->thread);
3487 md_wakeup_thread(mddev->sync_thread);
3496 /* similar to deny_write_access, but accounts for our holding a reference
3497 * to the file ourselves */
3498 static int deny_bitmap_write_access(struct file * file)
3500 struct inode *inode = file->f_mapping->host;
3502 spin_lock(&inode->i_lock);
3503 if (atomic_read(&inode->i_writecount) > 1) {
3504 spin_unlock(&inode->i_lock);
3507 atomic_set(&inode->i_writecount, -1);
3508 spin_unlock(&inode->i_lock);
3513 static void restore_bitmap_write_access(struct file *file)
3515 struct inode *inode = file->f_mapping->host;
3517 spin_lock(&inode->i_lock);
3518 atomic_set(&inode->i_writecount, 1);
3519 spin_unlock(&inode->i_lock);
3523 * 0 - completely stop and dis-assemble array
3524 * 1 - switch to readonly
3525 * 2 - stop but do not disassemble array
3527 static int do_md_stop(mddev_t * mddev, int mode)
3530 struct gendisk *disk = mddev->gendisk;
3533 if (atomic_read(&mddev->active)>2) {
3534 printk("md: %s still in use.\n",mdname(mddev));
3538 if (mddev->sync_thread) {
3539 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3540 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3541 md_unregister_thread(mddev->sync_thread);
3542 mddev->sync_thread = NULL;
3545 del_timer_sync(&mddev->safemode_timer);
3547 invalidate_partition(disk, 0);
3550 case 1: /* readonly */
3556 case 0: /* disassemble */
3558 bitmap_flush(mddev);
3559 md_super_wait(mddev);
3561 set_disk_ro(disk, 0);
3562 blk_queue_make_request(mddev->queue, md_fail_request);
3563 mddev->pers->stop(mddev);
3564 mddev->queue->merge_bvec_fn = NULL;
3565 mddev->queue->unplug_fn = NULL;
3566 mddev->queue->backing_dev_info.congested_fn = NULL;
3567 if (mddev->pers->sync_request)
3568 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3570 module_put(mddev->pers->owner);
3573 set_capacity(disk, 0);
3579 if (!mddev->in_sync || mddev->flags) {
3580 /* mark array as shutdown cleanly */
3582 md_update_sb(mddev, 1);
3585 set_disk_ro(disk, 1);
3586 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3590 * Free resources if final stop
3594 struct list_head *tmp;
3596 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3598 bitmap_destroy(mddev);
3599 if (mddev->bitmap_file) {
3600 restore_bitmap_write_access(mddev->bitmap_file);
3601 fput(mddev->bitmap_file);
3602 mddev->bitmap_file = NULL;
3604 mddev->bitmap_offset = 0;
3606 ITERATE_RDEV(mddev,rdev,tmp)
3607 if (rdev->raid_disk >= 0) {
3609 sprintf(nm, "rd%d", rdev->raid_disk);
3610 sysfs_remove_link(&mddev->kobj, nm);
3613 /* make sure all delayed_delete calls have finished */
3614 flush_scheduled_work();
3616 export_array(mddev);
3618 mddev->array_size = 0;
3620 mddev->raid_disks = 0;
3621 mddev->recovery_cp = 0;
3622 mddev->resync_max = MaxSector;
3623 mddev->reshape_position = MaxSector;
3624 mddev->external = 0;
3625 mddev->persistent = 0;
3627 } else if (mddev->pers)
3628 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3631 md_new_event(mddev);
3637 static void autorun_array(mddev_t *mddev)
3640 struct list_head *tmp;
3643 if (list_empty(&mddev->disks))
3646 printk(KERN_INFO "md: running: ");
3648 ITERATE_RDEV(mddev,rdev,tmp) {
3649 char b[BDEVNAME_SIZE];
3650 printk("<%s>", bdevname(rdev->bdev,b));
3654 err = do_md_run (mddev);
3656 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3657 do_md_stop (mddev, 0);
3662 * lets try to run arrays based on all disks that have arrived
3663 * until now. (those are in pending_raid_disks)
3665 * the method: pick the first pending disk, collect all disks with
3666 * the same UUID, remove all from the pending list and put them into
3667 * the 'same_array' list. Then order this list based on superblock
3668 * update time (freshest comes first), kick out 'old' disks and
3669 * compare superblocks. If everything's fine then run it.
3671 * If "unit" is allocated, then bump its reference count
3673 static void autorun_devices(int part)
3675 struct list_head *tmp;
3676 mdk_rdev_t *rdev0, *rdev;
3678 char b[BDEVNAME_SIZE];
3680 printk(KERN_INFO "md: autorun ...\n");
3681 while (!list_empty(&pending_raid_disks)) {
3684 LIST_HEAD(candidates);
3685 rdev0 = list_entry(pending_raid_disks.next,
3686 mdk_rdev_t, same_set);
3688 printk(KERN_INFO "md: considering %s ...\n",
3689 bdevname(rdev0->bdev,b));
3690 INIT_LIST_HEAD(&candidates);
3691 ITERATE_RDEV_PENDING(rdev,tmp)
3692 if (super_90_load(rdev, rdev0, 0) >= 0) {
3693 printk(KERN_INFO "md: adding %s ...\n",
3694 bdevname(rdev->bdev,b));
3695 list_move(&rdev->same_set, &candidates);
3698 * now we have a set of devices, with all of them having
3699 * mostly sane superblocks. It's time to allocate the
3703 dev = MKDEV(mdp_major,
3704 rdev0->preferred_minor << MdpMinorShift);
3705 unit = MINOR(dev) >> MdpMinorShift;
3707 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3710 if (rdev0->preferred_minor != unit) {
3711 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3712 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3716 md_probe(dev, NULL, NULL);
3717 mddev = mddev_find(dev);
3720 "md: cannot allocate memory for md drive.\n");
3723 if (mddev_lock(mddev))
3724 printk(KERN_WARNING "md: %s locked, cannot run\n",
3726 else if (mddev->raid_disks || mddev->major_version
3727 || !list_empty(&mddev->disks)) {
3729 "md: %s already running, cannot run %s\n",
3730 mdname(mddev), bdevname(rdev0->bdev,b));
3731 mddev_unlock(mddev);
3733 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3734 mddev->persistent = 1;
3735 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3736 list_del_init(&rdev->same_set);
3737 if (bind_rdev_to_array(rdev, mddev))
3740 autorun_array(mddev);
3741 mddev_unlock(mddev);
3743 /* on success, candidates will be empty, on error
3746 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3750 printk(KERN_INFO "md: ... autorun DONE.\n");
3752 #endif /* !MODULE */
3754 static int get_version(void __user * arg)
3758 ver.major = MD_MAJOR_VERSION;
3759 ver.minor = MD_MINOR_VERSION;
3760 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3762 if (copy_to_user(arg, &ver, sizeof(ver)))
3768 static int get_array_info(mddev_t * mddev, void __user * arg)
3770 mdu_array_info_t info;
3771 int nr,working,active,failed,spare;
3773 struct list_head *tmp;
3775 nr=working=active=failed=spare=0;
3776 ITERATE_RDEV(mddev,rdev,tmp) {
3778 if (test_bit(Faulty, &rdev->flags))
3782 if (test_bit(In_sync, &rdev->flags))
3789 info.major_version = mddev->major_version;
3790 info.minor_version = mddev->minor_version;
3791 info.patch_version = MD_PATCHLEVEL_VERSION;
3792 info.ctime = mddev->ctime;
3793 info.level = mddev->level;
3794 info.size = mddev->size;
3795 if (info.size != mddev->size) /* overflow */
3798 info.raid_disks = mddev->raid_disks;
3799 info.md_minor = mddev->md_minor;
3800 info.not_persistent= !mddev->persistent;
3802 info.utime = mddev->utime;
3805 info.state = (1<<MD_SB_CLEAN);
3806 if (mddev->bitmap && mddev->bitmap_offset)
3807 info.state = (1<<MD_SB_BITMAP_PRESENT);
3808 info.active_disks = active;
3809 info.working_disks = working;
3810 info.failed_disks = failed;
3811 info.spare_disks = spare;
3813 info.layout = mddev->layout;
3814 info.chunk_size = mddev->chunk_size;
3816 if (copy_to_user(arg, &info, sizeof(info)))
3822 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
3824 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3825 char *ptr, *buf = NULL;
3828 md_allow_write(mddev);
3830 file = kmalloc(sizeof(*file), GFP_KERNEL);
3834 /* bitmap disabled, zero the first byte and copy out */
3835 if (!mddev->bitmap || !mddev->bitmap->file) {
3836 file->pathname[0] = '\0';
3840 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3844 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3848 strcpy(file->pathname, ptr);
3852 if (copy_to_user(arg, file, sizeof(*file)))
3860 static int get_disk_info(mddev_t * mddev, void __user * arg)
3862 mdu_disk_info_t info;
3866 if (copy_from_user(&info, arg, sizeof(info)))
3871 rdev = find_rdev_nr(mddev, nr);
3873 info.major = MAJOR(rdev->bdev->bd_dev);
3874 info.minor = MINOR(rdev->bdev->bd_dev);
3875 info.raid_disk = rdev->raid_disk;
3877 if (test_bit(Faulty, &rdev->flags))
3878 info.state |= (1<<MD_DISK_FAULTY);
3879 else if (test_bit(In_sync, &rdev->flags)) {
3880 info.state |= (1<<MD_DISK_ACTIVE);
3881 info.state |= (1<<MD_DISK_SYNC);
3883 if (test_bit(WriteMostly, &rdev->flags))
3884 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3886 info.major = info.minor = 0;
3887 info.raid_disk = -1;
3888 info.state = (1<<MD_DISK_REMOVED);
3891 if (copy_to_user(arg, &info, sizeof(info)))
3897 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3899 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3901 dev_t dev = MKDEV(info->major,info->minor);
3903 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3906 if (!mddev->raid_disks) {
3908 /* expecting a device which has a superblock */
3909 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3912 "md: md_import_device returned %ld\n",
3914 return PTR_ERR(rdev);
3916 if (!list_empty(&mddev->disks)) {
3917 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3918 mdk_rdev_t, same_set);
3919 int err = super_types[mddev->major_version]
3920 .load_super(rdev, rdev0, mddev->minor_version);
3923 "md: %s has different UUID to %s\n",
3924 bdevname(rdev->bdev,b),
3925 bdevname(rdev0->bdev,b2));
3930 err = bind_rdev_to_array(rdev, mddev);
3937 * add_new_disk can be used once the array is assembled
3938 * to add "hot spares". They must already have a superblock
3943 if (!mddev->pers->hot_add_disk) {
3945 "%s: personality does not support diskops!\n",
3949 if (mddev->persistent)
3950 rdev = md_import_device(dev, mddev->major_version,
3951 mddev->minor_version);
3953 rdev = md_import_device(dev, -1, -1);
3956 "md: md_import_device returned %ld\n",
3958 return PTR_ERR(rdev);
3960 /* set save_raid_disk if appropriate */
3961 if (!mddev->persistent) {
3962 if (info->state & (1<<MD_DISK_SYNC) &&
3963 info->raid_disk < mddev->raid_disks)
3964 rdev->raid_disk = info->raid_disk;
3966 rdev->raid_disk = -1;
3968 super_types[mddev->major_version].
3969 validate_super(mddev, rdev);
3970 rdev->saved_raid_disk = rdev->raid_disk;
3972 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3973 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3974 set_bit(WriteMostly, &rdev->flags);
3976 rdev->raid_disk = -1;
3977 err = bind_rdev_to_array(rdev, mddev);
3978 if (!err && !mddev->pers->hot_remove_disk) {
3979 /* If there is hot_add_disk but no hot_remove_disk
3980 * then added disks for geometry changes,
3981 * and should be added immediately.
3983 super_types[mddev->major_version].
3984 validate_super(mddev, rdev);
3985 err = mddev->pers->hot_add_disk(mddev, rdev);
3987 unbind_rdev_from_array(rdev);
3992 md_update_sb(mddev, 1);
3993 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3994 md_wakeup_thread(mddev->thread);
3998 /* otherwise, add_new_disk is only allowed
3999 * for major_version==0 superblocks
4001 if (mddev->major_version != 0) {
4002 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4007 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4009 rdev = md_import_device (dev, -1, 0);
4012 "md: error, md_import_device() returned %ld\n",
4014 return PTR_ERR(rdev);
4016 rdev->desc_nr = info->number;
4017 if (info->raid_disk < mddev->raid_disks)
4018 rdev->raid_disk = info->raid_disk;
4020 rdev->raid_disk = -1;
4024 if (rdev->raid_disk < mddev->raid_disks)
4025 if (info->state & (1<<MD_DISK_SYNC))
4026 set_bit(In_sync, &rdev->flags);
4028 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4029 set_bit(WriteMostly, &rdev->flags);
4031 if (!mddev->persistent) {
4032 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4033 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4035 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4036 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
4038 err = bind_rdev_to_array(rdev, mddev);
4048 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4050 char b[BDEVNAME_SIZE];
4056 rdev = find_rdev(mddev, dev);
4060 if (rdev->raid_disk >= 0)
4063 kick_rdev_from_array(rdev);
4064 md_update_sb(mddev, 1);
4065 md_new_event(mddev);
4069 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
4070 bdevname(rdev->bdev,b), mdname(mddev));
4074 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4076 char b[BDEVNAME_SIZE];
4084 if (mddev->major_version != 0) {
4085 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4086 " version-0 superblocks.\n",
4090 if (!mddev->pers->hot_add_disk) {
4092 "%s: personality does not support diskops!\n",
4097 rdev = md_import_device (dev, -1, 0);
4100 "md: error, md_import_device() returned %ld\n",
4105 if (mddev->persistent)
4106 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4109 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4111 size = calc_dev_size(rdev, mddev->chunk_size);
4114 if (test_bit(Faulty, &rdev->flags)) {
4116 "md: can not hot-add faulty %s disk to %s!\n",
4117 bdevname(rdev->bdev,b), mdname(mddev));
4121 clear_bit(In_sync, &rdev->flags);
4123 rdev->saved_raid_disk = -1;
4124 err = bind_rdev_to_array(rdev, mddev);
4129 * The rest should better be atomic, we can have disk failures
4130 * noticed in interrupt contexts ...
4133 if (rdev->desc_nr == mddev->max_disks) {
4134 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4137 goto abort_unbind_export;
4140 rdev->raid_disk = -1;
4142 md_update_sb(mddev, 1);
4145 * Kick recovery, maybe this spare has to be added to the
4146 * array immediately.
4148 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4149 md_wakeup_thread(mddev->thread);
4150 md_new_event(mddev);
4153 abort_unbind_export:
4154 unbind_rdev_from_array(rdev);
4161 static int set_bitmap_file(mddev_t *mddev, int fd)
4166 if (!mddev->pers->quiesce)
4168 if (mddev->recovery || mddev->sync_thread)
4170 /* we should be able to change the bitmap.. */
4176 return -EEXIST; /* cannot add when bitmap is present */
4177 mddev->bitmap_file = fget(fd);
4179 if (mddev->bitmap_file == NULL) {
4180 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4185 err = deny_bitmap_write_access(mddev->bitmap_file);
4187 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4189 fput(mddev->bitmap_file);
4190 mddev->bitmap_file = NULL;
4193 mddev->bitmap_offset = 0; /* file overrides offset */
4194 } else if (mddev->bitmap == NULL)
4195 return -ENOENT; /* cannot remove what isn't there */
4198 mddev->pers->quiesce(mddev, 1);
4200 err = bitmap_create(mddev);
4201 if (fd < 0 || err) {
4202 bitmap_destroy(mddev);
4203 fd = -1; /* make sure to put the file */
4205 mddev->pers->quiesce(mddev, 0);
4208 if (mddev->bitmap_file) {
4209 restore_bitmap_write_access(mddev->bitmap_file);
4210 fput(mddev->bitmap_file);
4212 mddev->bitmap_file = NULL;
4219 * set_array_info is used two different ways
4220 * The original usage is when creating a new array.
4221 * In this usage, raid_disks is > 0 and it together with
4222 * level, size, not_persistent,layout,chunksize determine the
4223 * shape of the array.
4224 * This will always create an array with a type-0.90.0 superblock.
4225 * The newer usage is when assembling an array.
4226 * In this case raid_disks will be 0, and the major_version field is
4227 * use to determine which style super-blocks are to be found on the devices.
4228 * The minor and patch _version numbers are also kept incase the
4229 * super_block handler wishes to interpret them.
4231 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4234 if (info->raid_disks == 0) {
4235 /* just setting version number for superblock loading */
4236 if (info->major_version < 0 ||
4237 info->major_version >= ARRAY_SIZE(super_types) ||
4238 super_types[info->major_version].name == NULL) {
4239 /* maybe try to auto-load a module? */
4241 "md: superblock version %d not known\n",
4242 info->major_version);
4245 mddev->major_version = info->major_version;
4246 mddev->minor_version = info->minor_version;
4247 mddev->patch_version = info->patch_version;
4248 mddev->persistent = !info->not_persistent;
4251 mddev->major_version = MD_MAJOR_VERSION;
4252 mddev->minor_version = MD_MINOR_VERSION;
4253 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4254 mddev->ctime = get_seconds();
4256 mddev->level = info->level;
4257 mddev->clevel[0] = 0;
4258 mddev->size = info->size;
4259 mddev->raid_disks = info->raid_disks;
4260 /* don't set md_minor, it is determined by which /dev/md* was
4263 if (info->state & (1<<MD_SB_CLEAN))
4264 mddev->recovery_cp = MaxSector;
4266 mddev->recovery_cp = 0;
4267 mddev->persistent = ! info->not_persistent;
4268 mddev->external = 0;
4270 mddev->layout = info->layout;
4271 mddev->chunk_size = info->chunk_size;
4273 mddev->max_disks = MD_SB_DISKS;
4275 if (mddev->persistent)
4277 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4279 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4280 mddev->bitmap_offset = 0;
4282 mddev->reshape_position = MaxSector;
4285 * Generate a 128 bit UUID
4287 get_random_bytes(mddev->uuid, 16);
4289 mddev->new_level = mddev->level;
4290 mddev->new_chunk = mddev->chunk_size;
4291 mddev->new_layout = mddev->layout;
4292 mddev->delta_disks = 0;
4297 static int update_size(mddev_t *mddev, unsigned long size)
4301 struct list_head *tmp;
4302 int fit = (size == 0);
4304 if (mddev->pers->resize == NULL)
4306 /* The "size" is the amount of each device that is used.
4307 * This can only make sense for arrays with redundancy.
4308 * linear and raid0 always use whatever space is available
4309 * We can only consider changing the size if no resync
4310 * or reconstruction is happening, and if the new size
4311 * is acceptable. It must fit before the sb_offset or,
4312 * if that is <data_offset, it must fit before the
4313 * size of each device.
4314 * If size is zero, we find the largest size that fits.
4316 if (mddev->sync_thread)
4318 ITERATE_RDEV(mddev,rdev,tmp) {
4320 avail = rdev->size * 2;
4322 if (fit && (size == 0 || size > avail/2))
4324 if (avail < ((sector_t)size << 1))
4327 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4329 struct block_device *bdev;
4331 bdev = bdget_disk(mddev->gendisk, 0);
4333 mutex_lock(&bdev->bd_inode->i_mutex);
4334 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
4335 mutex_unlock(&bdev->bd_inode->i_mutex);
4342 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4345 /* change the number of raid disks */
4346 if (mddev->pers->check_reshape == NULL)
4348 if (raid_disks <= 0 ||
4349 raid_disks >= mddev->max_disks)
4351 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4353 mddev->delta_disks = raid_disks - mddev->raid_disks;
4355 rv = mddev->pers->check_reshape(mddev);
4361 * update_array_info is used to change the configuration of an
4363 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4364 * fields in the info are checked against the array.
4365 * Any differences that cannot be handled will cause an error.
4366 * Normally, only one change can be managed at a time.
4368 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4374 /* calculate expected state,ignoring low bits */
4375 if (mddev->bitmap && mddev->bitmap_offset)
4376 state |= (1 << MD_SB_BITMAP_PRESENT);
4378 if (mddev->major_version != info->major_version ||
4379 mddev->minor_version != info->minor_version ||
4380 /* mddev->patch_version != info->patch_version || */
4381 mddev->ctime != info->ctime ||
4382 mddev->level != info->level ||
4383 /* mddev->layout != info->layout || */
4384 !mddev->persistent != info->not_persistent||
4385 mddev->chunk_size != info->chunk_size ||
4386 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4387 ((state^info->state) & 0xfffffe00)
4390 /* Check there is only one change */
4391 if (info->size >= 0 && mddev->size != info->size) cnt++;
4392 if (mddev->raid_disks != info->raid_disks) cnt++;
4393 if (mddev->layout != info->layout) cnt++;
4394 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4395 if (cnt == 0) return 0;
4396 if (cnt > 1) return -EINVAL;
4398 if (mddev->layout != info->layout) {
4400 * we don't need to do anything at the md level, the
4401 * personality will take care of it all.
4403 if (mddev->pers->reconfig == NULL)
4406 return mddev->pers->reconfig(mddev, info->layout, -1);
4408 if (info->size >= 0 && mddev->size != info->size)
4409 rv = update_size(mddev, info->size);
4411 if (mddev->raid_disks != info->raid_disks)
4412 rv = update_raid_disks(mddev, info->raid_disks);
4414 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4415 if (mddev->pers->quiesce == NULL)
4417 if (mddev->recovery || mddev->sync_thread)
4419 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4420 /* add the bitmap */
4423 if (mddev->default_bitmap_offset == 0)
4425 mddev->bitmap_offset = mddev->default_bitmap_offset;
4426 mddev->pers->quiesce(mddev, 1);
4427 rv = bitmap_create(mddev);
4429 bitmap_destroy(mddev);
4430 mddev->pers->quiesce(mddev, 0);
4432 /* remove the bitmap */
4435 if (mddev->bitmap->file)
4437 mddev->pers->quiesce(mddev, 1);
4438 bitmap_destroy(mddev);
4439 mddev->pers->quiesce(mddev, 0);
4440 mddev->bitmap_offset = 0;
4443 md_update_sb(mddev, 1);
4447 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4451 if (mddev->pers == NULL)
4454 rdev = find_rdev(mddev, dev);
4458 md_error(mddev, rdev);
4462 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4464 mddev_t *mddev = bdev->bd_disk->private_data;
4468 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4472 static int md_ioctl(struct inode *inode, struct file *file,
4473 unsigned int cmd, unsigned long arg)
4476 void __user *argp = (void __user *)arg;
4477 mddev_t *mddev = NULL;
4479 if (!capable(CAP_SYS_ADMIN))
4483 * Commands dealing with the RAID driver but not any
4489 err = get_version(argp);
4492 case PRINT_RAID_DEBUG:
4500 autostart_arrays(arg);
4507 * Commands creating/starting a new array:
4510 mddev = inode->i_bdev->bd_disk->private_data;
4517 err = mddev_lock(mddev);
4520 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4527 case SET_ARRAY_INFO:
4529 mdu_array_info_t info;
4531 memset(&info, 0, sizeof(info));
4532 else if (copy_from_user(&info, argp, sizeof(info))) {
4537 err = update_array_info(mddev, &info);
4539 printk(KERN_WARNING "md: couldn't update"
4540 " array info. %d\n", err);
4545 if (!list_empty(&mddev->disks)) {
4547 "md: array %s already has disks!\n",
4552 if (mddev->raid_disks) {
4554 "md: array %s already initialised!\n",
4559 err = set_array_info(mddev, &info);
4561 printk(KERN_WARNING "md: couldn't set"
4562 " array info. %d\n", err);
4572 * Commands querying/configuring an existing array:
4574 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4575 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4576 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4577 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4578 && cmd != GET_BITMAP_FILE) {
4584 * Commands even a read-only array can execute:
4588 case GET_ARRAY_INFO:
4589 err = get_array_info(mddev, argp);
4592 case GET_BITMAP_FILE:
4593 err = get_bitmap_file(mddev, argp);
4597 err = get_disk_info(mddev, argp);
4600 case RESTART_ARRAY_RW:
4601 err = restart_array(mddev);
4605 err = do_md_stop (mddev, 0);
4609 err = do_md_stop (mddev, 1);
4613 * We have a problem here : there is no easy way to give a CHS
4614 * virtual geometry. We currently pretend that we have a 2 heads
4615 * 4 sectors (with a BIG number of cylinders...). This drives
4616 * dosfs just mad... ;-)
4621 * The remaining ioctls are changing the state of the
4622 * superblock, so we do not allow them on read-only arrays.
4623 * However non-MD ioctls (e.g. get-size) will still come through
4624 * here and hit the 'default' below, so only disallow
4625 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4627 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4628 mddev->ro && mddev->pers) {
4629 if (mddev->ro == 2) {
4631 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4632 md_wakeup_thread(mddev->thread);
4644 mdu_disk_info_t info;
4645 if (copy_from_user(&info, argp, sizeof(info)))
4648 err = add_new_disk(mddev, &info);
4652 case HOT_REMOVE_DISK:
4653 err = hot_remove_disk(mddev, new_decode_dev(arg));
4657 err = hot_add_disk(mddev, new_decode_dev(arg));
4660 case SET_DISK_FAULTY:
4661 err = set_disk_faulty(mddev, new_decode_dev(arg));
4665 err = do_md_run (mddev);
4668 case SET_BITMAP_FILE:
4669 err = set_bitmap_file(mddev, (int)arg);
4679 mddev_unlock(mddev);
4689 static int md_open(struct inode *inode, struct file *file)
4692 * Succeed if we can lock the mddev, which confirms that
4693 * it isn't being stopped right now.
4695 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4698 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
4703 mddev_unlock(mddev);
4705 check_disk_change(inode->i_bdev);
4710 static int md_release(struct inode *inode, struct file * file)
4712 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4720 static int md_media_changed(struct gendisk *disk)
4722 mddev_t *mddev = disk->private_data;
4724 return mddev->changed;
4727 static int md_revalidate(struct gendisk *disk)
4729 mddev_t *mddev = disk->private_data;
4734 static struct block_device_operations md_fops =
4736 .owner = THIS_MODULE,
4738 .release = md_release,
4740 .getgeo = md_getgeo,
4741 .media_changed = md_media_changed,
4742 .revalidate_disk= md_revalidate,
4745 static int md_thread(void * arg)
4747 mdk_thread_t *thread = arg;
4750 * md_thread is a 'system-thread', it's priority should be very
4751 * high. We avoid resource deadlocks individually in each
4752 * raid personality. (RAID5 does preallocation) We also use RR and
4753 * the very same RT priority as kswapd, thus we will never get
4754 * into a priority inversion deadlock.
4756 * we definitely have to have equal or higher priority than
4757 * bdflush, otherwise bdflush will deadlock if there are too
4758 * many dirty RAID5 blocks.
4761 allow_signal(SIGKILL);
4762 while (!kthread_should_stop()) {
4764 /* We need to wait INTERRUPTIBLE so that
4765 * we don't add to the load-average.
4766 * That means we need to be sure no signals are
4769 if (signal_pending(current))
4770 flush_signals(current);
4772 wait_event_interruptible_timeout
4774 test_bit(THREAD_WAKEUP, &thread->flags)
4775 || kthread_should_stop(),
4778 clear_bit(THREAD_WAKEUP, &thread->flags);
4780 thread->run(thread->mddev);
4786 void md_wakeup_thread(mdk_thread_t *thread)
4789 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4790 set_bit(THREAD_WAKEUP, &thread->flags);
4791 wake_up(&thread->wqueue);
4795 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4798 mdk_thread_t *thread;
4800 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
4804 init_waitqueue_head(&thread->wqueue);
4807 thread->mddev = mddev;
4808 thread->timeout = MAX_SCHEDULE_TIMEOUT;
4809 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
4810 if (IS_ERR(thread->tsk)) {
4817 void md_unregister_thread(mdk_thread_t *thread)
4819 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
4821 kthread_stop(thread->tsk);
4825 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4832 if (!rdev || test_bit(Faulty, &rdev->flags))
4835 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4837 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4838 __builtin_return_address(0),__builtin_return_address(1),
4839 __builtin_return_address(2),__builtin_return_address(3));
4843 if (!mddev->pers->error_handler)
4845 mddev->pers->error_handler(mddev,rdev);
4846 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4847 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4848 md_wakeup_thread(mddev->thread);
4849 md_new_event_inintr(mddev);
4852 /* seq_file implementation /proc/mdstat */
4854 static void status_unused(struct seq_file *seq)
4858 struct list_head *tmp;
4860 seq_printf(seq, "unused devices: ");
4862 ITERATE_RDEV_PENDING(rdev,tmp) {
4863 char b[BDEVNAME_SIZE];
4865 seq_printf(seq, "%s ",
4866 bdevname(rdev->bdev,b));
4869 seq_printf(seq, "<none>");
4871 seq_printf(seq, "\n");
4875 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4877 sector_t max_blocks, resync, res;
4878 unsigned long dt, db, rt;
4880 unsigned int per_milli;
4882 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4884 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4885 max_blocks = mddev->resync_max_sectors >> 1;
4887 max_blocks = mddev->size;
4890 * Should not happen.
4896 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4897 * in a sector_t, and (max_blocks>>scale) will fit in a
4898 * u32, as those are the requirements for sector_div.
4899 * Thus 'scale' must be at least 10
4902 if (sizeof(sector_t) > sizeof(unsigned long)) {
4903 while ( max_blocks/2 > (1ULL<<(scale+32)))
4906 res = (resync>>scale)*1000;
4907 sector_div(res, (u32)((max_blocks>>scale)+1));
4911 int i, x = per_milli/50, y = 20-x;
4912 seq_printf(seq, "[");
4913 for (i = 0; i < x; i++)
4914 seq_printf(seq, "=");
4915 seq_printf(seq, ">");
4916 for (i = 0; i < y; i++)
4917 seq_printf(seq, ".");
4918 seq_printf(seq, "] ");
4920 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
4921 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4923 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4925 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4926 "resync" : "recovery"))),
4927 per_milli/10, per_milli % 10,
4928 (unsigned long long) resync,
4929 (unsigned long long) max_blocks);
4932 * We do not want to overflow, so the order of operands and
4933 * the * 100 / 100 trick are important. We do a +1 to be
4934 * safe against division by zero. We only estimate anyway.
4936 * dt: time from mark until now
4937 * db: blocks written from mark until now
4938 * rt: remaining time
4940 dt = ((jiffies - mddev->resync_mark) / HZ);
4942 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4943 - mddev->resync_mark_cnt;
4944 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
4946 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4948 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
4951 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4953 struct list_head *tmp;
4963 spin_lock(&all_mddevs_lock);
4964 list_for_each(tmp,&all_mddevs)
4966 mddev = list_entry(tmp, mddev_t, all_mddevs);
4968 spin_unlock(&all_mddevs_lock);
4971 spin_unlock(&all_mddevs_lock);
4973 return (void*)2;/* tail */
4977 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4979 struct list_head *tmp;
4980 mddev_t *next_mddev, *mddev = v;
4986 spin_lock(&all_mddevs_lock);
4988 tmp = all_mddevs.next;
4990 tmp = mddev->all_mddevs.next;
4991 if (tmp != &all_mddevs)
4992 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4994 next_mddev = (void*)2;
4997 spin_unlock(&all_mddevs_lock);
5005 static void md_seq_stop(struct seq_file *seq, void *v)
5009 if (mddev && v != (void*)1 && v != (void*)2)
5013 struct mdstat_info {
5017 static int md_seq_show(struct seq_file *seq, void *v)
5021 struct list_head *tmp2;
5023 struct mdstat_info *mi = seq->private;
5024 struct bitmap *bitmap;
5026 if (v == (void*)1) {
5027 struct mdk_personality *pers;
5028 seq_printf(seq, "Personalities : ");
5029 spin_lock(&pers_lock);
5030 list_for_each_entry(pers, &pers_list, list)
5031 seq_printf(seq, "[%s] ", pers->name);
5033 spin_unlock(&pers_lock);
5034 seq_printf(seq, "\n");
5035 mi->event = atomic_read(&md_event_count);
5038 if (v == (void*)2) {
5043 if (mddev_lock(mddev) < 0)
5046 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5047 seq_printf(seq, "%s : %sactive", mdname(mddev),
5048 mddev->pers ? "" : "in");
5051 seq_printf(seq, " (read-only)");
5053 seq_printf(seq, "(auto-read-only)");
5054 seq_printf(seq, " %s", mddev->pers->name);
5058 ITERATE_RDEV(mddev,rdev,tmp2) {
5059 char b[BDEVNAME_SIZE];
5060 seq_printf(seq, " %s[%d]",
5061 bdevname(rdev->bdev,b), rdev->desc_nr);
5062 if (test_bit(WriteMostly, &rdev->flags))
5063 seq_printf(seq, "(W)");
5064 if (test_bit(Faulty, &rdev->flags)) {
5065 seq_printf(seq, "(F)");
5067 } else if (rdev->raid_disk < 0)
5068 seq_printf(seq, "(S)"); /* spare */
5072 if (!list_empty(&mddev->disks)) {
5074 seq_printf(seq, "\n %llu blocks",
5075 (unsigned long long)mddev->array_size);
5077 seq_printf(seq, "\n %llu blocks",
5078 (unsigned long long)size);
5080 if (mddev->persistent) {
5081 if (mddev->major_version != 0 ||
5082 mddev->minor_version != 90) {
5083 seq_printf(seq," super %d.%d",
5084 mddev->major_version,
5085 mddev->minor_version);
5087 } else if (mddev->external)
5088 seq_printf(seq, " super external:%s",
5089 mddev->metadata_type);
5091 seq_printf(seq, " super non-persistent");
5094 mddev->pers->status (seq, mddev);
5095 seq_printf(seq, "\n ");
5096 if (mddev->pers->sync_request) {
5097 if (mddev->curr_resync > 2) {
5098 status_resync (seq, mddev);
5099 seq_printf(seq, "\n ");
5100 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5101 seq_printf(seq, "\tresync=DELAYED\n ");
5102 else if (mddev->recovery_cp < MaxSector)
5103 seq_printf(seq, "\tresync=PENDING\n ");
5106 seq_printf(seq, "\n ");
5108 if ((bitmap = mddev->bitmap)) {
5109 unsigned long chunk_kb;
5110 unsigned long flags;
5111 spin_lock_irqsave(&bitmap->lock, flags);
5112 chunk_kb = bitmap->chunksize >> 10;
5113 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5115 bitmap->pages - bitmap->missing_pages,
5117 (bitmap->pages - bitmap->missing_pages)
5118 << (PAGE_SHIFT - 10),
5119 chunk_kb ? chunk_kb : bitmap->chunksize,
5120 chunk_kb ? "KB" : "B");
5122 seq_printf(seq, ", file: ");
5123 seq_path(seq, bitmap->file->f_path.mnt,
5124 bitmap->file->f_path.dentry," \t\n");
5127 seq_printf(seq, "\n");
5128 spin_unlock_irqrestore(&bitmap->lock, flags);
5131 seq_printf(seq, "\n");
5133 mddev_unlock(mddev);
5138 static struct seq_operations md_seq_ops = {
5139 .start = md_seq_start,
5140 .next = md_seq_next,
5141 .stop = md_seq_stop,
5142 .show = md_seq_show,
5145 static int md_seq_open(struct inode *inode, struct file *file)
5148 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5152 error = seq_open(file, &md_seq_ops);
5156 struct seq_file *p = file->private_data;
5158 mi->event = atomic_read(&md_event_count);
5163 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5165 struct seq_file *m = filp->private_data;
5166 struct mdstat_info *mi = m->private;
5169 poll_wait(filp, &md_event_waiters, wait);
5171 /* always allow read */
5172 mask = POLLIN | POLLRDNORM;
5174 if (mi->event != atomic_read(&md_event_count))
5175 mask |= POLLERR | POLLPRI;
5179 static const struct file_operations md_seq_fops = {
5180 .owner = THIS_MODULE,
5181 .open = md_seq_open,
5183 .llseek = seq_lseek,
5184 .release = seq_release_private,
5185 .poll = mdstat_poll,
5188 int register_md_personality(struct mdk_personality *p)
5190 spin_lock(&pers_lock);
5191 list_add_tail(&p->list, &pers_list);
5192 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5193 spin_unlock(&pers_lock);
5197 int unregister_md_personality(struct mdk_personality *p)
5199 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5200 spin_lock(&pers_lock);
5201 list_del_init(&p->list);
5202 spin_unlock(&pers_lock);
5206 static int is_mddev_idle(mddev_t *mddev)
5209 struct list_head *tmp;
5214 ITERATE_RDEV(mddev,rdev,tmp) {
5215 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5216 curr_events = disk_stat_read(disk, sectors[0]) +
5217 disk_stat_read(disk, sectors[1]) -
5218 atomic_read(&disk->sync_io);
5219 /* sync IO will cause sync_io to increase before the disk_stats
5220 * as sync_io is counted when a request starts, and
5221 * disk_stats is counted when it completes.
5222 * So resync activity will cause curr_events to be smaller than
5223 * when there was no such activity.
5224 * non-sync IO will cause disk_stat to increase without
5225 * increasing sync_io so curr_events will (eventually)
5226 * be larger than it was before. Once it becomes
5227 * substantially larger, the test below will cause
5228 * the array to appear non-idle, and resync will slow
5230 * If there is a lot of outstanding resync activity when
5231 * we set last_event to curr_events, then all that activity
5232 * completing might cause the array to appear non-idle
5233 * and resync will be slowed down even though there might
5234 * not have been non-resync activity. This will only
5235 * happen once though. 'last_events' will soon reflect
5236 * the state where there is little or no outstanding
5237 * resync requests, and further resync activity will
5238 * always make curr_events less than last_events.
5241 if (curr_events - rdev->last_events > 4096) {
5242 rdev->last_events = curr_events;
5249 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5251 /* another "blocks" (512byte) blocks have been synced */
5252 atomic_sub(blocks, &mddev->recovery_active);
5253 wake_up(&mddev->recovery_wait);
5255 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5256 md_wakeup_thread(mddev->thread);
5257 // stop recovery, signal do_sync ....
5262 /* md_write_start(mddev, bi)
5263 * If we need to update some array metadata (e.g. 'active' flag
5264 * in superblock) before writing, schedule a superblock update
5265 * and wait for it to complete.
5267 void md_write_start(mddev_t *mddev, struct bio *bi)
5269 if (bio_data_dir(bi) != WRITE)
5272 BUG_ON(mddev->ro == 1);
5273 if (mddev->ro == 2) {
5274 /* need to switch to read/write */
5276 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5277 md_wakeup_thread(mddev->thread);
5279 atomic_inc(&mddev->writes_pending);
5280 if (mddev->in_sync) {
5281 spin_lock_irq(&mddev->write_lock);
5282 if (mddev->in_sync) {
5284 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5285 md_wakeup_thread(mddev->thread);
5287 spin_unlock_irq(&mddev->write_lock);
5289 wait_event(mddev->sb_wait, mddev->flags==0);
5292 void md_write_end(mddev_t *mddev)
5294 if (atomic_dec_and_test(&mddev->writes_pending)) {
5295 if (mddev->safemode == 2)
5296 md_wakeup_thread(mddev->thread);
5297 else if (mddev->safemode_delay)
5298 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5302 /* md_allow_write(mddev)
5303 * Calling this ensures that the array is marked 'active' so that writes
5304 * may proceed without blocking. It is important to call this before
5305 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5306 * Must be called with mddev_lock held.
5308 void md_allow_write(mddev_t *mddev)
5315 spin_lock_irq(&mddev->write_lock);
5316 if (mddev->in_sync) {
5318 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5319 if (mddev->safemode_delay &&
5320 mddev->safemode == 0)
5321 mddev->safemode = 1;
5322 spin_unlock_irq(&mddev->write_lock);
5323 md_update_sb(mddev, 0);
5325 spin_unlock_irq(&mddev->write_lock);
5327 EXPORT_SYMBOL_GPL(md_allow_write);
5329 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
5331 #define SYNC_MARKS 10
5332 #define SYNC_MARK_STEP (3*HZ)
5333 void md_do_sync(mddev_t *mddev)
5336 unsigned int currspeed = 0,
5338 sector_t max_sectors,j, io_sectors;
5339 unsigned long mark[SYNC_MARKS];
5340 sector_t mark_cnt[SYNC_MARKS];
5342 struct list_head *tmp;
5343 sector_t last_check;
5345 struct list_head *rtmp;
5349 /* just incase thread restarts... */
5350 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5352 if (mddev->ro) /* never try to sync a read-only array */
5355 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5356 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5357 desc = "data-check";
5358 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5359 desc = "requested-resync";
5362 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5367 /* we overload curr_resync somewhat here.
5368 * 0 == not engaged in resync at all
5369 * 2 == checking that there is no conflict with another sync
5370 * 1 == like 2, but have yielded to allow conflicting resync to
5372 * other == active in resync - this many blocks
5374 * Before starting a resync we must have set curr_resync to
5375 * 2, and then checked that every "conflicting" array has curr_resync
5376 * less than ours. When we find one that is the same or higher
5377 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5378 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5379 * This will mean we have to start checking from the beginning again.
5384 mddev->curr_resync = 2;
5387 if (kthread_should_stop()) {
5388 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5391 ITERATE_MDDEV(mddev2,tmp) {
5392 if (mddev2 == mddev)
5394 if (mddev2->curr_resync &&
5395 match_mddev_units(mddev,mddev2)) {
5397 if (mddev < mddev2 && mddev->curr_resync == 2) {
5398 /* arbitrarily yield */
5399 mddev->curr_resync = 1;
5400 wake_up(&resync_wait);
5402 if (mddev > mddev2 && mddev->curr_resync == 1)
5403 /* no need to wait here, we can wait the next
5404 * time 'round when curr_resync == 2
5407 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5408 if (!kthread_should_stop() &&
5409 mddev2->curr_resync >= mddev->curr_resync) {
5410 printk(KERN_INFO "md: delaying %s of %s"
5411 " until %s has finished (they"
5412 " share one or more physical units)\n",
5413 desc, mdname(mddev), mdname(mddev2));
5416 finish_wait(&resync_wait, &wq);
5419 finish_wait(&resync_wait, &wq);
5422 } while (mddev->curr_resync < 2);
5425 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5426 /* resync follows the size requested by the personality,
5427 * which defaults to physical size, but can be virtual size
5429 max_sectors = mddev->resync_max_sectors;
5430 mddev->resync_mismatches = 0;
5431 /* we don't use the checkpoint if there's a bitmap */
5432 if (!mddev->bitmap &&
5433 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5434 j = mddev->recovery_cp;
5435 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5436 max_sectors = mddev->size << 1;
5438 /* recovery follows the physical size of devices */
5439 max_sectors = mddev->size << 1;
5441 ITERATE_RDEV(mddev,rdev,rtmp)
5442 if (rdev->raid_disk >= 0 &&
5443 !test_bit(Faulty, &rdev->flags) &&
5444 !test_bit(In_sync, &rdev->flags) &&
5445 rdev->recovery_offset < j)
5446 j = rdev->recovery_offset;
5449 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5450 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5451 " %d KB/sec/disk.\n", speed_min(mddev));
5452 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5453 "(but not more than %d KB/sec) for %s.\n",
5454 speed_max(mddev), desc);
5456 is_mddev_idle(mddev); /* this also initializes IO event counters */
5459 for (m = 0; m < SYNC_MARKS; m++) {
5461 mark_cnt[m] = io_sectors;
5464 mddev->resync_mark = mark[last_mark];
5465 mddev->resync_mark_cnt = mark_cnt[last_mark];
5468 * Tune reconstruction:
5470 window = 32*(PAGE_SIZE/512);
5471 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5472 window/2,(unsigned long long) max_sectors/2);
5474 atomic_set(&mddev->recovery_active, 0);
5475 init_waitqueue_head(&mddev->recovery_wait);
5480 "md: resuming %s of %s from checkpoint.\n",
5481 desc, mdname(mddev));
5482 mddev->curr_resync = j;
5485 while (j < max_sectors) {
5489 if (j >= mddev->resync_max) {
5490 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5491 wait_event(mddev->recovery_wait,
5492 mddev->resync_max > j
5493 || kthread_should_stop());
5495 if (kthread_should_stop())
5497 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5498 currspeed < speed_min(mddev));
5500 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5504 if (!skipped) { /* actual IO requested */
5505 io_sectors += sectors;
5506 atomic_add(sectors, &mddev->recovery_active);
5510 if (j>1) mddev->curr_resync = j;
5511 mddev->curr_mark_cnt = io_sectors;
5512 if (last_check == 0)
5513 /* this is the earliers that rebuilt will be
5514 * visible in /proc/mdstat
5516 md_new_event(mddev);
5518 if (last_check + window > io_sectors || j == max_sectors)
5521 last_check = io_sectors;
5523 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5524 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5528 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5530 int next = (last_mark+1) % SYNC_MARKS;
5532 mddev->resync_mark = mark[next];
5533 mddev->resync_mark_cnt = mark_cnt[next];
5534 mark[next] = jiffies;
5535 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5540 if (kthread_should_stop())
5545 * this loop exits only if either when we are slower than
5546 * the 'hard' speed limit, or the system was IO-idle for
5548 * the system might be non-idle CPU-wise, but we only care
5549 * about not overloading the IO subsystem. (things like an
5550 * e2fsck being done on the RAID array should execute fast)
5552 blk_unplug(mddev->queue);
5555 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5556 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5558 if (currspeed > speed_min(mddev)) {
5559 if ((currspeed > speed_max(mddev)) ||
5560 !is_mddev_idle(mddev)) {
5566 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5568 * this also signals 'finished resyncing' to md_stop
5571 blk_unplug(mddev->queue);
5573 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5575 /* tell personality that we are finished */
5576 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5578 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5579 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5580 mddev->curr_resync > 2) {
5581 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5582 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5583 if (mddev->curr_resync >= mddev->recovery_cp) {
5585 "md: checkpointing %s of %s.\n",
5586 desc, mdname(mddev));
5587 mddev->recovery_cp = mddev->curr_resync;
5590 mddev->recovery_cp = MaxSector;
5592 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5593 mddev->curr_resync = MaxSector;
5594 ITERATE_RDEV(mddev,rdev,rtmp)
5595 if (rdev->raid_disk >= 0 &&
5596 !test_bit(Faulty, &rdev->flags) &&
5597 !test_bit(In_sync, &rdev->flags) &&
5598 rdev->recovery_offset < mddev->curr_resync)
5599 rdev->recovery_offset = mddev->curr_resync;
5602 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5605 mddev->curr_resync = 0;
5606 mddev->resync_max = MaxSector;
5607 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5608 wake_up(&resync_wait);
5609 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5610 md_wakeup_thread(mddev->thread);
5615 * got a signal, exit.
5618 "md: md_do_sync() got signal ... exiting\n");
5619 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5623 EXPORT_SYMBOL_GPL(md_do_sync);
5626 static int remove_and_add_spares(mddev_t *mddev)
5629 struct list_head *rtmp;
5632 ITERATE_RDEV(mddev,rdev,rtmp)
5633 if (rdev->raid_disk >= 0 &&
5635 (test_bit(Faulty, &rdev->flags) ||
5636 ! test_bit(In_sync, &rdev->flags)) &&
5637 atomic_read(&rdev->nr_pending)==0) {
5638 if (mddev->pers->hot_remove_disk(
5639 mddev, rdev->raid_disk)==0) {
5641 sprintf(nm,"rd%d", rdev->raid_disk);
5642 sysfs_remove_link(&mddev->kobj, nm);
5643 rdev->raid_disk = -1;
5647 if (mddev->degraded) {
5648 ITERATE_RDEV(mddev,rdev,rtmp)
5649 if (rdev->raid_disk < 0
5650 && !test_bit(Faulty, &rdev->flags)) {
5651 rdev->recovery_offset = 0;
5652 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5654 sprintf(nm, "rd%d", rdev->raid_disk);
5655 if (sysfs_create_link(&mddev->kobj,
5658 "md: cannot register "
5662 md_new_event(mddev);
5670 * This routine is regularly called by all per-raid-array threads to
5671 * deal with generic issues like resync and super-block update.
5672 * Raid personalities that don't have a thread (linear/raid0) do not
5673 * need this as they never do any recovery or update the superblock.
5675 * It does not do any resync itself, but rather "forks" off other threads
5676 * to do that as needed.
5677 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5678 * "->recovery" and create a thread at ->sync_thread.
5679 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5680 * and wakeups up this thread which will reap the thread and finish up.
5681 * This thread also removes any faulty devices (with nr_pending == 0).
5683 * The overall approach is:
5684 * 1/ if the superblock needs updating, update it.
5685 * 2/ If a recovery thread is running, don't do anything else.
5686 * 3/ If recovery has finished, clean up, possibly marking spares active.
5687 * 4/ If there are any faulty devices, remove them.
5688 * 5/ If array is degraded, try to add spares devices
5689 * 6/ If array has spares or is not in-sync, start a resync thread.
5691 void md_check_recovery(mddev_t *mddev)
5694 struct list_head *rtmp;
5698 bitmap_daemon_work(mddev->bitmap);
5703 if (signal_pending(current)) {
5704 if (mddev->pers->sync_request) {
5705 printk(KERN_INFO "md: %s in immediate safe mode\n",
5707 mddev->safemode = 2;
5709 flush_signals(current);
5713 (mddev->flags && !mddev->external) ||
5714 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
5715 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5716 (mddev->safemode == 1) ||
5717 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5718 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
5722 if (mddev_trylock(mddev)) {
5725 spin_lock_irq(&mddev->write_lock);
5726 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5727 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5729 if (mddev->persistent)
5730 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5732 if (mddev->safemode == 1)
5733 mddev->safemode = 0;
5734 spin_unlock_irq(&mddev->write_lock);
5737 md_update_sb(mddev, 0);
5740 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5741 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5742 /* resync/recovery still happening */
5743 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5746 if (mddev->sync_thread) {
5747 /* resync has finished, collect result */
5748 md_unregister_thread(mddev->sync_thread);
5749 mddev->sync_thread = NULL;
5750 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5751 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5753 /* activate any spares */
5754 mddev->pers->spare_active(mddev);
5756 md_update_sb(mddev, 1);
5758 /* if array is no-longer degraded, then any saved_raid_disk
5759 * information must be scrapped
5761 if (!mddev->degraded)
5762 ITERATE_RDEV(mddev,rdev,rtmp)
5763 rdev->saved_raid_disk = -1;
5765 mddev->recovery = 0;
5766 /* flag recovery needed just to double check */
5767 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5768 md_new_event(mddev);
5771 /* Clear some bits that don't mean anything, but
5774 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5775 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5776 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5777 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
5779 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5781 /* no recovery is running.
5782 * remove any failed drives, then
5783 * add spares if possible.
5784 * Spare are also removed and re-added, to allow
5785 * the personality to fail the re-add.
5788 if (mddev->reshape_position != MaxSector) {
5789 if (mddev->pers->check_reshape(mddev) != 0)
5790 /* Cannot proceed */
5792 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5793 } else if ((spares = remove_and_add_spares(mddev))) {
5794 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5795 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5796 } else if (mddev->recovery_cp < MaxSector) {
5797 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5798 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5799 /* nothing to be done ... */
5802 if (mddev->pers->sync_request) {
5803 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
5804 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5805 /* We are adding a device or devices to an array
5806 * which has the bitmap stored on all devices.
5807 * So make sure all bitmap pages get written
5809 bitmap_write_all(mddev->bitmap);
5811 mddev->sync_thread = md_register_thread(md_do_sync,
5814 if (!mddev->sync_thread) {
5815 printk(KERN_ERR "%s: could not start resync"
5818 /* leave the spares where they are, it shouldn't hurt */
5819 mddev->recovery = 0;
5821 md_wakeup_thread(mddev->sync_thread);
5822 md_new_event(mddev);
5825 mddev_unlock(mddev);
5829 static int md_notify_reboot(struct notifier_block *this,
5830 unsigned long code, void *x)
5832 struct list_head *tmp;
5835 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5837 printk(KERN_INFO "md: stopping all md devices.\n");
5839 ITERATE_MDDEV(mddev,tmp)
5840 if (mddev_trylock(mddev)) {
5841 do_md_stop (mddev, 1);
5842 mddev_unlock(mddev);
5845 * certain more exotic SCSI devices are known to be
5846 * volatile wrt too early system reboots. While the
5847 * right place to handle this issue is the given
5848 * driver, we do want to have a safe RAID driver ...
5855 static struct notifier_block md_notifier = {
5856 .notifier_call = md_notify_reboot,
5858 .priority = INT_MAX, /* before any real devices */
5861 static void md_geninit(void)
5863 struct proc_dir_entry *p;
5865 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5867 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5869 p->proc_fops = &md_seq_fops;
5872 static int __init md_init(void)
5874 if (register_blkdev(MAJOR_NR, "md"))
5876 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5877 unregister_blkdev(MAJOR_NR, "md");
5880 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5881 md_probe, NULL, NULL);
5882 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
5883 md_probe, NULL, NULL);
5885 register_reboot_notifier(&md_notifier);
5886 raid_table_header = register_sysctl_table(raid_root_table);
5896 * Searches all registered partitions for autorun RAID arrays
5900 static LIST_HEAD(all_detected_devices);
5901 struct detected_devices_node {
5902 struct list_head list;
5906 void md_autodetect_dev(dev_t dev)
5908 struct detected_devices_node *node_detected_dev;
5910 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
5911 if (node_detected_dev) {
5912 node_detected_dev->dev = dev;
5913 list_add_tail(&node_detected_dev->list, &all_detected_devices);
5915 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
5916 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
5921 static void autostart_arrays(int part)
5924 struct detected_devices_node *node_detected_dev;
5926 int i_scanned, i_passed;
5931 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5933 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
5935 node_detected_dev = list_entry(all_detected_devices.next,
5936 struct detected_devices_node, list);
5937 list_del(&node_detected_dev->list);
5938 dev = node_detected_dev->dev;
5939 kfree(node_detected_dev);
5940 rdev = md_import_device(dev,0, 90);
5944 if (test_bit(Faulty, &rdev->flags)) {
5948 list_add(&rdev->same_set, &pending_raid_disks);
5952 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
5953 i_scanned, i_passed);
5955 autorun_devices(part);
5958 #endif /* !MODULE */
5960 static __exit void md_exit(void)
5963 struct list_head *tmp;
5965 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
5966 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
5968 unregister_blkdev(MAJOR_NR,"md");
5969 unregister_blkdev(mdp_major, "mdp");
5970 unregister_reboot_notifier(&md_notifier);
5971 unregister_sysctl_table(raid_table_header);
5972 remove_proc_entry("mdstat", NULL);
5973 ITERATE_MDDEV(mddev,tmp) {
5974 struct gendisk *disk = mddev->gendisk;
5977 export_array(mddev);
5980 mddev->gendisk = NULL;
5985 subsys_initcall(md_init);
5986 module_exit(md_exit)
5988 static int get_ro(char *buffer, struct kernel_param *kp)
5990 return sprintf(buffer, "%d", start_readonly);
5992 static int set_ro(const char *val, struct kernel_param *kp)
5995 int num = simple_strtoul(val, &e, 10);
5996 if (*val && (*e == '\0' || *e == '\n')) {
5997 start_readonly = num;
6003 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6004 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6007 EXPORT_SYMBOL(register_md_personality);
6008 EXPORT_SYMBOL(unregister_md_personality);
6009 EXPORT_SYMBOL(md_error);
6010 EXPORT_SYMBOL(md_done_sync);
6011 EXPORT_SYMBOL(md_write_start);
6012 EXPORT_SYMBOL(md_write_end);
6013 EXPORT_SYMBOL(md_register_thread);
6014 EXPORT_SYMBOL(md_unregister_thread);
6015 EXPORT_SYMBOL(md_wakeup_thread);
6016 EXPORT_SYMBOL(md_check_recovery);
6017 MODULE_LICENSE("GPL");
6019 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);