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 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
79 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min = 1000;
95 static int sysctl_speed_limit_max = 200000;
96 static inline int speed_min(mddev_t *mddev)
98 return mddev->sync_speed_min ?
99 mddev->sync_speed_min : sysctl_speed_limit_min;
102 static inline int speed_max(mddev_t *mddev)
104 return mddev->sync_speed_max ?
105 mddev->sync_speed_max : sysctl_speed_limit_max;
108 static struct ctl_table_header *raid_table_header;
110 static ctl_table raid_table[] = {
112 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
113 .procname = "speed_limit_min",
114 .data = &sysctl_speed_limit_min,
115 .maxlen = sizeof(int),
116 .mode = S_IRUGO|S_IWUSR,
117 .proc_handler = &proc_dointvec,
120 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
121 .procname = "speed_limit_max",
122 .data = &sysctl_speed_limit_max,
123 .maxlen = sizeof(int),
124 .mode = S_IRUGO|S_IWUSR,
125 .proc_handler = &proc_dointvec,
130 static ctl_table raid_dir_table[] = {
132 .ctl_name = DEV_RAID,
135 .mode = S_IRUGO|S_IXUGO,
141 static ctl_table raid_root_table[] = {
147 .child = raid_dir_table,
152 static struct block_device_operations md_fops;
154 static int start_readonly;
157 * We have a system wide 'event count' that is incremented
158 * on any 'interesting' event, and readers of /proc/mdstat
159 * can use 'poll' or 'select' to find out when the event
163 * start array, stop array, error, add device, remove device,
164 * start build, activate spare
166 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
167 static atomic_t md_event_count;
168 void md_new_event(mddev_t *mddev)
170 atomic_inc(&md_event_count);
171 wake_up(&md_event_waiters);
173 EXPORT_SYMBOL_GPL(md_new_event);
175 /* Alternate version that can be called from interrupts
176 * when calling sysfs_notify isn't needed.
178 static void md_new_event_inintr(mddev_t *mddev)
180 atomic_inc(&md_event_count);
181 wake_up(&md_event_waiters);
185 * Enables to iterate over all existing md arrays
186 * all_mddevs_lock protects this list.
188 static LIST_HEAD(all_mddevs);
189 static DEFINE_SPINLOCK(all_mddevs_lock);
193 * iterates through all used mddevs in the system.
194 * We take care to grab the all_mddevs_lock whenever navigating
195 * the list, and to always hold a refcount when unlocked.
196 * Any code which breaks out of this loop while own
197 * a reference to the current mddev and must mddev_put it.
199 #define for_each_mddev(mddev,tmp) \
201 for (({ spin_lock(&all_mddevs_lock); \
202 tmp = all_mddevs.next; \
204 ({ if (tmp != &all_mddevs) \
205 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
206 spin_unlock(&all_mddevs_lock); \
207 if (mddev) mddev_put(mddev); \
208 mddev = list_entry(tmp, mddev_t, all_mddevs); \
209 tmp != &all_mddevs;}); \
210 ({ spin_lock(&all_mddevs_lock); \
215 static int md_fail_request (struct request_queue *q, struct bio *bio)
221 static inline mddev_t *mddev_get(mddev_t *mddev)
223 atomic_inc(&mddev->active);
227 static void mddev_put(mddev_t *mddev)
229 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
231 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
232 list_del(&mddev->all_mddevs);
233 spin_unlock(&all_mddevs_lock);
234 blk_cleanup_queue(mddev->queue);
235 kobject_put(&mddev->kobj);
237 spin_unlock(&all_mddevs_lock);
240 static mddev_t * mddev_find(dev_t unit)
242 mddev_t *mddev, *new = NULL;
245 spin_lock(&all_mddevs_lock);
246 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
247 if (mddev->unit == unit) {
249 spin_unlock(&all_mddevs_lock);
255 list_add(&new->all_mddevs, &all_mddevs);
256 spin_unlock(&all_mddevs_lock);
259 spin_unlock(&all_mddevs_lock);
261 new = kzalloc(sizeof(*new), GFP_KERNEL);
266 if (MAJOR(unit) == MD_MAJOR)
267 new->md_minor = MINOR(unit);
269 new->md_minor = MINOR(unit) >> MdpMinorShift;
271 mutex_init(&new->reconfig_mutex);
272 INIT_LIST_HEAD(&new->disks);
273 INIT_LIST_HEAD(&new->all_mddevs);
274 init_timer(&new->safemode_timer);
275 atomic_set(&new->active, 1);
276 spin_lock_init(&new->write_lock);
277 init_waitqueue_head(&new->sb_wait);
278 init_waitqueue_head(&new->recovery_wait);
279 new->reshape_position = MaxSector;
281 new->resync_max = MaxSector;
282 new->level = LEVEL_NONE;
284 new->queue = blk_alloc_queue(GFP_KERNEL);
289 /* Can be unlocked because the queue is new: no concurrency */
290 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue);
292 blk_queue_make_request(new->queue, md_fail_request);
297 static inline int mddev_lock(mddev_t * mddev)
299 return mutex_lock_interruptible(&mddev->reconfig_mutex);
302 static inline int mddev_trylock(mddev_t * mddev)
304 return mutex_trylock(&mddev->reconfig_mutex);
307 static inline void mddev_unlock(mddev_t * mddev)
309 mutex_unlock(&mddev->reconfig_mutex);
311 md_wakeup_thread(mddev->thread);
314 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
317 struct list_head *tmp;
319 rdev_for_each(rdev, tmp, mddev) {
320 if (rdev->desc_nr == nr)
326 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
328 struct list_head *tmp;
331 rdev_for_each(rdev, tmp, mddev) {
332 if (rdev->bdev->bd_dev == dev)
338 static struct mdk_personality *find_pers(int level, char *clevel)
340 struct mdk_personality *pers;
341 list_for_each_entry(pers, &pers_list, list) {
342 if (level != LEVEL_NONE && pers->level == level)
344 if (strcmp(pers->name, clevel)==0)
350 /* return the offset of the super block in 512byte sectors */
351 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
353 sector_t num_sectors = bdev->bd_inode->i_size / 512;
354 return MD_NEW_SIZE_SECTORS(num_sectors);
357 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
359 sector_t num_sectors = rdev->sb_start;
362 num_sectors &= ~((sector_t)chunk_size/512 - 1);
366 static int alloc_disk_sb(mdk_rdev_t * rdev)
371 rdev->sb_page = alloc_page(GFP_KERNEL);
372 if (!rdev->sb_page) {
373 printk(KERN_ALERT "md: out of memory.\n");
380 static void free_disk_sb(mdk_rdev_t * rdev)
383 put_page(rdev->sb_page);
385 rdev->sb_page = NULL;
392 static void super_written(struct bio *bio, int error)
394 mdk_rdev_t *rdev = bio->bi_private;
395 mddev_t *mddev = rdev->mddev;
397 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
398 printk("md: super_written gets error=%d, uptodate=%d\n",
399 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
400 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
401 md_error(mddev, rdev);
404 if (atomic_dec_and_test(&mddev->pending_writes))
405 wake_up(&mddev->sb_wait);
409 static void super_written_barrier(struct bio *bio, int error)
411 struct bio *bio2 = bio->bi_private;
412 mdk_rdev_t *rdev = bio2->bi_private;
413 mddev_t *mddev = rdev->mddev;
415 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
416 error == -EOPNOTSUPP) {
418 /* barriers don't appear to be supported :-( */
419 set_bit(BarriersNotsupp, &rdev->flags);
420 mddev->barriers_work = 0;
421 spin_lock_irqsave(&mddev->write_lock, flags);
422 bio2->bi_next = mddev->biolist;
423 mddev->biolist = bio2;
424 spin_unlock_irqrestore(&mddev->write_lock, flags);
425 wake_up(&mddev->sb_wait);
429 bio->bi_private = rdev;
430 super_written(bio, error);
434 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
435 sector_t sector, int size, struct page *page)
437 /* write first size bytes of page to sector of rdev
438 * Increment mddev->pending_writes before returning
439 * and decrement it on completion, waking up sb_wait
440 * if zero is reached.
441 * If an error occurred, call md_error
443 * As we might need to resubmit the request if BIO_RW_BARRIER
444 * causes ENOTSUPP, we allocate a spare bio...
446 struct bio *bio = bio_alloc(GFP_NOIO, 1);
447 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
449 bio->bi_bdev = rdev->bdev;
450 bio->bi_sector = sector;
451 bio_add_page(bio, page, size, 0);
452 bio->bi_private = rdev;
453 bio->bi_end_io = super_written;
456 atomic_inc(&mddev->pending_writes);
457 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
459 rw |= (1<<BIO_RW_BARRIER);
460 rbio = bio_clone(bio, GFP_NOIO);
461 rbio->bi_private = bio;
462 rbio->bi_end_io = super_written_barrier;
463 submit_bio(rw, rbio);
468 void md_super_wait(mddev_t *mddev)
470 /* wait for all superblock writes that were scheduled to complete.
471 * if any had to be retried (due to BARRIER problems), retry them
475 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
476 if (atomic_read(&mddev->pending_writes)==0)
478 while (mddev->biolist) {
480 spin_lock_irq(&mddev->write_lock);
481 bio = mddev->biolist;
482 mddev->biolist = bio->bi_next ;
484 spin_unlock_irq(&mddev->write_lock);
485 submit_bio(bio->bi_rw, bio);
489 finish_wait(&mddev->sb_wait, &wq);
492 static void bi_complete(struct bio *bio, int error)
494 complete((struct completion*)bio->bi_private);
497 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
498 struct page *page, int rw)
500 struct bio *bio = bio_alloc(GFP_NOIO, 1);
501 struct completion event;
504 rw |= (1 << BIO_RW_SYNC);
507 bio->bi_sector = sector;
508 bio_add_page(bio, page, size, 0);
509 init_completion(&event);
510 bio->bi_private = &event;
511 bio->bi_end_io = bi_complete;
513 wait_for_completion(&event);
515 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
519 EXPORT_SYMBOL_GPL(sync_page_io);
521 static int read_disk_sb(mdk_rdev_t * rdev, int size)
523 char b[BDEVNAME_SIZE];
524 if (!rdev->sb_page) {
532 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
538 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
539 bdevname(rdev->bdev,b));
543 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
545 return sb1->set_uuid0 == sb2->set_uuid0 &&
546 sb1->set_uuid1 == sb2->set_uuid1 &&
547 sb1->set_uuid2 == sb2->set_uuid2 &&
548 sb1->set_uuid3 == sb2->set_uuid3;
551 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
554 mdp_super_t *tmp1, *tmp2;
556 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
557 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
559 if (!tmp1 || !tmp2) {
561 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
569 * nr_disks is not constant
574 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
582 static u32 md_csum_fold(u32 csum)
584 csum = (csum & 0xffff) + (csum >> 16);
585 return (csum & 0xffff) + (csum >> 16);
588 static unsigned int calc_sb_csum(mdp_super_t * sb)
591 u32 *sb32 = (u32*)sb;
593 unsigned int disk_csum, csum;
595 disk_csum = sb->sb_csum;
598 for (i = 0; i < MD_SB_BYTES/4 ; i++)
600 csum = (newcsum & 0xffffffff) + (newcsum>>32);
604 /* This used to use csum_partial, which was wrong for several
605 * reasons including that different results are returned on
606 * different architectures. It isn't critical that we get exactly
607 * the same return value as before (we always csum_fold before
608 * testing, and that removes any differences). However as we
609 * know that csum_partial always returned a 16bit value on
610 * alphas, do a fold to maximise conformity to previous behaviour.
612 sb->sb_csum = md_csum_fold(disk_csum);
614 sb->sb_csum = disk_csum;
621 * Handle superblock details.
622 * We want to be able to handle multiple superblock formats
623 * so we have a common interface to them all, and an array of
624 * different handlers.
625 * We rely on user-space to write the initial superblock, and support
626 * reading and updating of superblocks.
627 * Interface methods are:
628 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
629 * loads and validates a superblock on dev.
630 * if refdev != NULL, compare superblocks on both devices
632 * 0 - dev has a superblock that is compatible with refdev
633 * 1 - dev has a superblock that is compatible and newer than refdev
634 * so dev should be used as the refdev in future
635 * -EINVAL superblock incompatible or invalid
636 * -othererror e.g. -EIO
638 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
639 * Verify that dev is acceptable into mddev.
640 * The first time, mddev->raid_disks will be 0, and data from
641 * dev should be merged in. Subsequent calls check that dev
642 * is new enough. Return 0 or -EINVAL
644 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
645 * Update the superblock for rdev with data in mddev
646 * This does not write to disc.
652 struct module *owner;
653 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
655 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
656 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
657 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
658 unsigned long long size);
662 * load_super for 0.90.0
664 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
666 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
671 * Calculate the position of the superblock (512byte sectors),
672 * it's at the end of the disk.
674 * It also happens to be a multiple of 4Kb.
676 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
678 ret = read_disk_sb(rdev, MD_SB_BYTES);
683 bdevname(rdev->bdev, b);
684 sb = (mdp_super_t*)page_address(rdev->sb_page);
686 if (sb->md_magic != MD_SB_MAGIC) {
687 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
692 if (sb->major_version != 0 ||
693 sb->minor_version < 90 ||
694 sb->minor_version > 91) {
695 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
696 sb->major_version, sb->minor_version,
701 if (sb->raid_disks <= 0)
704 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
705 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
710 rdev->preferred_minor = sb->md_minor;
711 rdev->data_offset = 0;
712 rdev->sb_size = MD_SB_BYTES;
714 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
715 if (sb->level != 1 && sb->level != 4
716 && sb->level != 5 && sb->level != 6
717 && sb->level != 10) {
718 /* FIXME use a better test */
720 "md: bitmaps not supported for this level.\n");
725 if (sb->level == LEVEL_MULTIPATH)
728 rdev->desc_nr = sb->this_disk.number;
734 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
735 if (!uuid_equal(refsb, sb)) {
736 printk(KERN_WARNING "md: %s has different UUID to %s\n",
737 b, bdevname(refdev->bdev,b2));
740 if (!sb_equal(refsb, sb)) {
741 printk(KERN_WARNING "md: %s has same UUID"
742 " but different superblock to %s\n",
743 b, bdevname(refdev->bdev, b2));
747 ev2 = md_event(refsb);
753 rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2;
755 if (rdev->size < sb->size && sb->level > 1)
756 /* "this cannot possibly happen" ... */
764 * validate_super for 0.90.0
766 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
769 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
770 __u64 ev1 = md_event(sb);
772 rdev->raid_disk = -1;
773 clear_bit(Faulty, &rdev->flags);
774 clear_bit(In_sync, &rdev->flags);
775 clear_bit(WriteMostly, &rdev->flags);
776 clear_bit(BarriersNotsupp, &rdev->flags);
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 rdev_for_each(rdev2, tmp, mddev) {
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 * rdev_size_change for 0.90.0
1000 static unsigned long long
1001 super_90_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size)
1003 if (size && size < rdev->mddev->size)
1004 return 0; /* component must fit device */
1005 size *= 2; /* convert to sectors */
1006 if (rdev->mddev->bitmap_offset)
1007 return 0; /* can't move bitmap */
1008 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1009 if (!size || size > rdev->sb_start)
1010 size = rdev->sb_start;
1011 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1013 md_super_wait(rdev->mddev);
1014 return size/2; /* kB for sysfs */
1019 * version 1 superblock
1022 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1026 unsigned long long newcsum;
1027 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1028 __le32 *isuper = (__le32*)sb;
1031 disk_csum = sb->sb_csum;
1034 for (i=0; size>=4; size -= 4 )
1035 newcsum += le32_to_cpu(*isuper++);
1038 newcsum += le16_to_cpu(*(__le16*) isuper);
1040 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1041 sb->sb_csum = disk_csum;
1042 return cpu_to_le32(csum);
1045 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1047 struct mdp_superblock_1 *sb;
1050 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1054 * Calculate the position of the superblock in 512byte sectors.
1055 * It is always aligned to a 4K boundary and
1056 * depeding on minor_version, it can be:
1057 * 0: At least 8K, but less than 12K, from end of device
1058 * 1: At start of device
1059 * 2: 4K from start of device.
1061 switch(minor_version) {
1063 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1065 sb_start &= ~(sector_t)(4*2-1);
1076 rdev->sb_start = sb_start;
1078 /* superblock is rarely larger than 1K, but it can be larger,
1079 * and it is safe to read 4k, so we do that
1081 ret = read_disk_sb(rdev, 4096);
1082 if (ret) return ret;
1085 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1087 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1088 sb->major_version != cpu_to_le32(1) ||
1089 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1090 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1091 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1094 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1095 printk("md: invalid superblock checksum on %s\n",
1096 bdevname(rdev->bdev,b));
1099 if (le64_to_cpu(sb->data_size) < 10) {
1100 printk("md: data_size too small on %s\n",
1101 bdevname(rdev->bdev,b));
1104 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1105 if (sb->level != cpu_to_le32(1) &&
1106 sb->level != cpu_to_le32(4) &&
1107 sb->level != cpu_to_le32(5) &&
1108 sb->level != cpu_to_le32(6) &&
1109 sb->level != cpu_to_le32(10)) {
1111 "md: bitmaps not supported for this level.\n");
1116 rdev->preferred_minor = 0xffff;
1117 rdev->data_offset = le64_to_cpu(sb->data_offset);
1118 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1120 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1121 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1122 if (rdev->sb_size & bmask)
1123 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1126 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1129 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1132 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1138 struct mdp_superblock_1 *refsb =
1139 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1141 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1142 sb->level != refsb->level ||
1143 sb->layout != refsb->layout ||
1144 sb->chunksize != refsb->chunksize) {
1145 printk(KERN_WARNING "md: %s has strangely different"
1146 " superblock to %s\n",
1147 bdevname(rdev->bdev,b),
1148 bdevname(refdev->bdev,b2));
1151 ev1 = le64_to_cpu(sb->events);
1152 ev2 = le64_to_cpu(refsb->events);
1160 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1162 rdev->size = rdev->sb_start / 2;
1163 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1165 rdev->size = le64_to_cpu(sb->data_size)/2;
1166 if (le32_to_cpu(sb->chunksize))
1167 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1169 if (le64_to_cpu(sb->size) > rdev->size*2)
1174 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1176 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1177 __u64 ev1 = le64_to_cpu(sb->events);
1179 rdev->raid_disk = -1;
1180 clear_bit(Faulty, &rdev->flags);
1181 clear_bit(In_sync, &rdev->flags);
1182 clear_bit(WriteMostly, &rdev->flags);
1183 clear_bit(BarriersNotsupp, &rdev->flags);
1185 if (mddev->raid_disks == 0) {
1186 mddev->major_version = 1;
1187 mddev->patch_version = 0;
1188 mddev->external = 0;
1189 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1190 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1191 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1192 mddev->level = le32_to_cpu(sb->level);
1193 mddev->clevel[0] = 0;
1194 mddev->layout = le32_to_cpu(sb->layout);
1195 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1196 mddev->size = le64_to_cpu(sb->size)/2;
1197 mddev->events = ev1;
1198 mddev->bitmap_offset = 0;
1199 mddev->default_bitmap_offset = 1024 >> 9;
1201 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1202 memcpy(mddev->uuid, sb->set_uuid, 16);
1204 mddev->max_disks = (4096-256)/2;
1206 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1207 mddev->bitmap_file == NULL )
1208 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1210 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1211 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1212 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1213 mddev->new_level = le32_to_cpu(sb->new_level);
1214 mddev->new_layout = le32_to_cpu(sb->new_layout);
1215 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1217 mddev->reshape_position = MaxSector;
1218 mddev->delta_disks = 0;
1219 mddev->new_level = mddev->level;
1220 mddev->new_layout = mddev->layout;
1221 mddev->new_chunk = mddev->chunk_size;
1224 } else if (mddev->pers == NULL) {
1225 /* Insist of good event counter while assembling */
1227 if (ev1 < mddev->events)
1229 } else if (mddev->bitmap) {
1230 /* If adding to array with a bitmap, then we can accept an
1231 * older device, but not too old.
1233 if (ev1 < mddev->bitmap->events_cleared)
1236 if (ev1 < mddev->events)
1237 /* just a hot-add of a new device, leave raid_disk at -1 */
1240 if (mddev->level != LEVEL_MULTIPATH) {
1242 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1244 case 0xffff: /* spare */
1246 case 0xfffe: /* faulty */
1247 set_bit(Faulty, &rdev->flags);
1250 if ((le32_to_cpu(sb->feature_map) &
1251 MD_FEATURE_RECOVERY_OFFSET))
1252 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1254 set_bit(In_sync, &rdev->flags);
1255 rdev->raid_disk = role;
1258 if (sb->devflags & WriteMostly1)
1259 set_bit(WriteMostly, &rdev->flags);
1260 } else /* MULTIPATH are always insync */
1261 set_bit(In_sync, &rdev->flags);
1266 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1268 struct mdp_superblock_1 *sb;
1269 struct list_head *tmp;
1272 /* make rdev->sb match mddev and rdev data. */
1274 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1276 sb->feature_map = 0;
1278 sb->recovery_offset = cpu_to_le64(0);
1279 memset(sb->pad1, 0, sizeof(sb->pad1));
1280 memset(sb->pad2, 0, sizeof(sb->pad2));
1281 memset(sb->pad3, 0, sizeof(sb->pad3));
1283 sb->utime = cpu_to_le64((__u64)mddev->utime);
1284 sb->events = cpu_to_le64(mddev->events);
1286 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1288 sb->resync_offset = cpu_to_le64(0);
1290 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1292 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1293 sb->size = cpu_to_le64(mddev->size<<1);
1295 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1296 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1297 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1300 if (rdev->raid_disk >= 0 &&
1301 !test_bit(In_sync, &rdev->flags) &&
1302 rdev->recovery_offset > 0) {
1303 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1304 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1307 if (mddev->reshape_position != MaxSector) {
1308 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1309 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1310 sb->new_layout = cpu_to_le32(mddev->new_layout);
1311 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1312 sb->new_level = cpu_to_le32(mddev->new_level);
1313 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1317 rdev_for_each(rdev2, tmp, mddev)
1318 if (rdev2->desc_nr+1 > max_dev)
1319 max_dev = rdev2->desc_nr+1;
1321 if (max_dev > le32_to_cpu(sb->max_dev))
1322 sb->max_dev = cpu_to_le32(max_dev);
1323 for (i=0; i<max_dev;i++)
1324 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1326 rdev_for_each(rdev2, tmp, mddev) {
1328 if (test_bit(Faulty, &rdev2->flags))
1329 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1330 else if (test_bit(In_sync, &rdev2->flags))
1331 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1332 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1333 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1335 sb->dev_roles[i] = cpu_to_le16(0xffff);
1338 sb->sb_csum = calc_sb_1_csum(sb);
1341 static unsigned long long
1342 super_1_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size)
1344 struct mdp_superblock_1 *sb;
1345 unsigned long long max_size;
1346 if (size && size < rdev->mddev->size)
1347 return 0; /* component must fit device */
1348 size *= 2; /* convert to sectors */
1349 if (rdev->sb_start < rdev->data_offset) {
1350 /* minor versions 1 and 2; superblock before data */
1351 max_size = (rdev->bdev->bd_inode->i_size >> 9);
1352 max_size -= rdev->data_offset;
1353 if (!size || size > max_size)
1355 } else if (rdev->mddev->bitmap_offset) {
1356 /* minor version 0 with bitmap we can't move */
1359 /* minor version 0; superblock after data */
1361 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1362 sb_start &= ~(sector_t)(4*2 - 1);
1363 max_size = rdev->size*2 + sb_start - rdev->sb_start;
1364 if (!size || size > max_size)
1366 rdev->sb_start = sb_start;
1368 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1369 sb->data_size = cpu_to_le64(size);
1370 sb->super_offset = rdev->sb_start;
1371 sb->sb_csum = calc_sb_1_csum(sb);
1372 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1374 md_super_wait(rdev->mddev);
1375 return size/2; /* kB for sysfs */
1378 static struct super_type super_types[] = {
1381 .owner = THIS_MODULE,
1382 .load_super = super_90_load,
1383 .validate_super = super_90_validate,
1384 .sync_super = super_90_sync,
1385 .rdev_size_change = super_90_rdev_size_change,
1389 .owner = THIS_MODULE,
1390 .load_super = super_1_load,
1391 .validate_super = super_1_validate,
1392 .sync_super = super_1_sync,
1393 .rdev_size_change = super_1_rdev_size_change,
1397 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1399 struct list_head *tmp, *tmp2;
1400 mdk_rdev_t *rdev, *rdev2;
1402 rdev_for_each(rdev, tmp, mddev1)
1403 rdev_for_each(rdev2, tmp2, mddev2)
1404 if (rdev->bdev->bd_contains ==
1405 rdev2->bdev->bd_contains)
1411 static LIST_HEAD(pending_raid_disks);
1413 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1415 char b[BDEVNAME_SIZE];
1425 /* prevent duplicates */
1426 if (find_rdev(mddev, rdev->bdev->bd_dev))
1429 /* make sure rdev->size exceeds mddev->size */
1430 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1432 /* Cannot change size, so fail
1433 * If mddev->level <= 0, then we don't care
1434 * about aligning sizes (e.g. linear)
1436 if (mddev->level > 0)
1439 mddev->size = rdev->size;
1442 /* Verify rdev->desc_nr is unique.
1443 * If it is -1, assign a free number, else
1444 * check number is not in use
1446 if (rdev->desc_nr < 0) {
1448 if (mddev->pers) choice = mddev->raid_disks;
1449 while (find_rdev_nr(mddev, choice))
1451 rdev->desc_nr = choice;
1453 if (find_rdev_nr(mddev, rdev->desc_nr))
1456 bdevname(rdev->bdev,b);
1457 while ( (s=strchr(b, '/')) != NULL)
1460 rdev->mddev = mddev;
1461 printk(KERN_INFO "md: bind<%s>\n", b);
1463 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1466 if (rdev->bdev->bd_part)
1467 ko = &rdev->bdev->bd_part->dev.kobj;
1469 ko = &rdev->bdev->bd_disk->dev.kobj;
1470 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1471 kobject_del(&rdev->kobj);
1474 list_add(&rdev->same_set, &mddev->disks);
1475 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1479 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1484 static void md_delayed_delete(struct work_struct *ws)
1486 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1487 kobject_del(&rdev->kobj);
1488 kobject_put(&rdev->kobj);
1491 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1493 char b[BDEVNAME_SIZE];
1498 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1499 list_del_init(&rdev->same_set);
1500 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1502 sysfs_remove_link(&rdev->kobj, "block");
1504 /* We need to delay this, otherwise we can deadlock when
1505 * writing to 'remove' to "dev/state"
1507 INIT_WORK(&rdev->del_work, md_delayed_delete);
1508 kobject_get(&rdev->kobj);
1509 schedule_work(&rdev->del_work);
1513 * prevent the device from being mounted, repartitioned or
1514 * otherwise reused by a RAID array (or any other kernel
1515 * subsystem), by bd_claiming the device.
1517 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1520 struct block_device *bdev;
1521 char b[BDEVNAME_SIZE];
1523 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1525 printk(KERN_ERR "md: could not open %s.\n",
1526 __bdevname(dev, b));
1527 return PTR_ERR(bdev);
1529 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1531 printk(KERN_ERR "md: could not bd_claim %s.\n",
1537 set_bit(AllReserved, &rdev->flags);
1542 static void unlock_rdev(mdk_rdev_t *rdev)
1544 struct block_device *bdev = rdev->bdev;
1552 void md_autodetect_dev(dev_t dev);
1554 static void export_rdev(mdk_rdev_t * rdev)
1556 char b[BDEVNAME_SIZE];
1557 printk(KERN_INFO "md: export_rdev(%s)\n",
1558 bdevname(rdev->bdev,b));
1562 list_del_init(&rdev->same_set);
1564 if (test_bit(AutoDetected, &rdev->flags))
1565 md_autodetect_dev(rdev->bdev->bd_dev);
1568 kobject_put(&rdev->kobj);
1571 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1573 unbind_rdev_from_array(rdev);
1577 static void export_array(mddev_t *mddev)
1579 struct list_head *tmp;
1582 rdev_for_each(rdev, tmp, mddev) {
1587 kick_rdev_from_array(rdev);
1589 if (!list_empty(&mddev->disks))
1591 mddev->raid_disks = 0;
1592 mddev->major_version = 0;
1595 static void print_desc(mdp_disk_t *desc)
1597 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1598 desc->major,desc->minor,desc->raid_disk,desc->state);
1601 static void print_sb(mdp_super_t *sb)
1606 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1607 sb->major_version, sb->minor_version, sb->patch_version,
1608 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1610 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1611 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1612 sb->md_minor, sb->layout, sb->chunk_size);
1613 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1614 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1615 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1616 sb->failed_disks, sb->spare_disks,
1617 sb->sb_csum, (unsigned long)sb->events_lo);
1620 for (i = 0; i < MD_SB_DISKS; i++) {
1623 desc = sb->disks + i;
1624 if (desc->number || desc->major || desc->minor ||
1625 desc->raid_disk || (desc->state && (desc->state != 4))) {
1626 printk(" D %2d: ", i);
1630 printk(KERN_INFO "md: THIS: ");
1631 print_desc(&sb->this_disk);
1635 static void print_rdev(mdk_rdev_t *rdev)
1637 char b[BDEVNAME_SIZE];
1638 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1639 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1640 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1642 if (rdev->sb_loaded) {
1643 printk(KERN_INFO "md: rdev superblock:\n");
1644 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1646 printk(KERN_INFO "md: no rdev superblock!\n");
1649 static void md_print_devices(void)
1651 struct list_head *tmp, *tmp2;
1654 char b[BDEVNAME_SIZE];
1657 printk("md: **********************************\n");
1658 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1659 printk("md: **********************************\n");
1660 for_each_mddev(mddev, tmp) {
1663 bitmap_print_sb(mddev->bitmap);
1665 printk("%s: ", mdname(mddev));
1666 rdev_for_each(rdev, tmp2, mddev)
1667 printk("<%s>", bdevname(rdev->bdev,b));
1670 rdev_for_each(rdev, tmp2, mddev)
1673 printk("md: **********************************\n");
1678 static void sync_sbs(mddev_t * mddev, int nospares)
1680 /* Update each superblock (in-memory image), but
1681 * if we are allowed to, skip spares which already
1682 * have the right event counter, or have one earlier
1683 * (which would mean they aren't being marked as dirty
1684 * with the rest of the array)
1687 struct list_head *tmp;
1689 rdev_for_each(rdev, tmp, mddev) {
1690 if (rdev->sb_events == mddev->events ||
1692 rdev->raid_disk < 0 &&
1693 (rdev->sb_events&1)==0 &&
1694 rdev->sb_events+1 == mddev->events)) {
1695 /* Don't update this superblock */
1696 rdev->sb_loaded = 2;
1698 super_types[mddev->major_version].
1699 sync_super(mddev, rdev);
1700 rdev->sb_loaded = 1;
1705 static void md_update_sb(mddev_t * mddev, int force_change)
1707 struct list_head *tmp;
1712 if (mddev->external)
1715 spin_lock_irq(&mddev->write_lock);
1717 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1718 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1720 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1721 /* just a clean<-> dirty transition, possibly leave spares alone,
1722 * though if events isn't the right even/odd, we will have to do
1728 if (mddev->degraded)
1729 /* If the array is degraded, then skipping spares is both
1730 * dangerous and fairly pointless.
1731 * Dangerous because a device that was removed from the array
1732 * might have a event_count that still looks up-to-date,
1733 * so it can be re-added without a resync.
1734 * Pointless because if there are any spares to skip,
1735 * then a recovery will happen and soon that array won't
1736 * be degraded any more and the spare can go back to sleep then.
1740 sync_req = mddev->in_sync;
1741 mddev->utime = get_seconds();
1743 /* If this is just a dirty<->clean transition, and the array is clean
1744 * and 'events' is odd, we can roll back to the previous clean state */
1746 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1747 && (mddev->events & 1)
1748 && mddev->events != 1)
1751 /* otherwise we have to go forward and ... */
1753 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1754 /* .. if the array isn't clean, insist on an odd 'events' */
1755 if ((mddev->events&1)==0) {
1760 /* otherwise insist on an even 'events' (for clean states) */
1761 if ((mddev->events&1)) {
1768 if (!mddev->events) {
1770 * oops, this 64-bit counter should never wrap.
1771 * Either we are in around ~1 trillion A.C., assuming
1772 * 1 reboot per second, or we have a bug:
1779 * do not write anything to disk if using
1780 * nonpersistent superblocks
1782 if (!mddev->persistent) {
1783 if (!mddev->external)
1784 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1786 spin_unlock_irq(&mddev->write_lock);
1787 wake_up(&mddev->sb_wait);
1790 sync_sbs(mddev, nospares);
1791 spin_unlock_irq(&mddev->write_lock);
1794 "md: updating %s RAID superblock on device (in sync %d)\n",
1795 mdname(mddev),mddev->in_sync);
1797 bitmap_update_sb(mddev->bitmap);
1798 rdev_for_each(rdev, tmp, mddev) {
1799 char b[BDEVNAME_SIZE];
1800 dprintk(KERN_INFO "md: ");
1801 if (rdev->sb_loaded != 1)
1802 continue; /* no noise on spare devices */
1803 if (test_bit(Faulty, &rdev->flags))
1804 dprintk("(skipping faulty ");
1806 dprintk("%s ", bdevname(rdev->bdev,b));
1807 if (!test_bit(Faulty, &rdev->flags)) {
1808 md_super_write(mddev,rdev,
1809 rdev->sb_start, rdev->sb_size,
1811 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1812 bdevname(rdev->bdev,b),
1813 (unsigned long long)rdev->sb_start);
1814 rdev->sb_events = mddev->events;
1818 if (mddev->level == LEVEL_MULTIPATH)
1819 /* only need to write one superblock... */
1822 md_super_wait(mddev);
1823 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1825 spin_lock_irq(&mddev->write_lock);
1826 if (mddev->in_sync != sync_req ||
1827 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1828 /* have to write it out again */
1829 spin_unlock_irq(&mddev->write_lock);
1832 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1833 spin_unlock_irq(&mddev->write_lock);
1834 wake_up(&mddev->sb_wait);
1838 /* words written to sysfs files may, or may not, be \n terminated.
1839 * We want to accept with case. For this we use cmd_match.
1841 static int cmd_match(const char *cmd, const char *str)
1843 /* See if cmd, written into a sysfs file, matches
1844 * str. They must either be the same, or cmd can
1845 * have a trailing newline
1847 while (*cmd && *str && *cmd == *str) {
1858 struct rdev_sysfs_entry {
1859 struct attribute attr;
1860 ssize_t (*show)(mdk_rdev_t *, char *);
1861 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1865 state_show(mdk_rdev_t *rdev, char *page)
1870 if (test_bit(Faulty, &rdev->flags)) {
1871 len+= sprintf(page+len, "%sfaulty",sep);
1874 if (test_bit(In_sync, &rdev->flags)) {
1875 len += sprintf(page+len, "%sin_sync",sep);
1878 if (test_bit(WriteMostly, &rdev->flags)) {
1879 len += sprintf(page+len, "%swrite_mostly",sep);
1882 if (test_bit(Blocked, &rdev->flags)) {
1883 len += sprintf(page+len, "%sblocked", sep);
1886 if (!test_bit(Faulty, &rdev->flags) &&
1887 !test_bit(In_sync, &rdev->flags)) {
1888 len += sprintf(page+len, "%sspare", sep);
1891 return len+sprintf(page+len, "\n");
1895 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1898 * faulty - simulates and error
1899 * remove - disconnects the device
1900 * writemostly - sets write_mostly
1901 * -writemostly - clears write_mostly
1902 * blocked - sets the Blocked flag
1903 * -blocked - clears the Blocked flag
1906 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1907 md_error(rdev->mddev, rdev);
1909 } else if (cmd_match(buf, "remove")) {
1910 if (rdev->raid_disk >= 0)
1913 mddev_t *mddev = rdev->mddev;
1914 kick_rdev_from_array(rdev);
1916 md_update_sb(mddev, 1);
1917 md_new_event(mddev);
1920 } else if (cmd_match(buf, "writemostly")) {
1921 set_bit(WriteMostly, &rdev->flags);
1923 } else if (cmd_match(buf, "-writemostly")) {
1924 clear_bit(WriteMostly, &rdev->flags);
1926 } else if (cmd_match(buf, "blocked")) {
1927 set_bit(Blocked, &rdev->flags);
1929 } else if (cmd_match(buf, "-blocked")) {
1930 clear_bit(Blocked, &rdev->flags);
1931 wake_up(&rdev->blocked_wait);
1932 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1933 md_wakeup_thread(rdev->mddev->thread);
1938 sysfs_notify(&rdev->kobj, NULL, "state");
1939 return err ? err : len;
1941 static struct rdev_sysfs_entry rdev_state =
1942 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1945 errors_show(mdk_rdev_t *rdev, char *page)
1947 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1951 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1954 unsigned long n = simple_strtoul(buf, &e, 10);
1955 if (*buf && (*e == 0 || *e == '\n')) {
1956 atomic_set(&rdev->corrected_errors, n);
1961 static struct rdev_sysfs_entry rdev_errors =
1962 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1965 slot_show(mdk_rdev_t *rdev, char *page)
1967 if (rdev->raid_disk < 0)
1968 return sprintf(page, "none\n");
1970 return sprintf(page, "%d\n", rdev->raid_disk);
1974 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1979 int slot = simple_strtoul(buf, &e, 10);
1980 if (strncmp(buf, "none", 4)==0)
1982 else if (e==buf || (*e && *e!= '\n'))
1984 if (rdev->mddev->pers && slot == -1) {
1985 /* Setting 'slot' on an active array requires also
1986 * updating the 'rd%d' link, and communicating
1987 * with the personality with ->hot_*_disk.
1988 * For now we only support removing
1989 * failed/spare devices. This normally happens automatically,
1990 * but not when the metadata is externally managed.
1992 if (rdev->raid_disk == -1)
1994 /* personality does all needed checks */
1995 if (rdev->mddev->pers->hot_add_disk == NULL)
1997 err = rdev->mddev->pers->
1998 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2001 sprintf(nm, "rd%d", rdev->raid_disk);
2002 sysfs_remove_link(&rdev->mddev->kobj, nm);
2003 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2004 md_wakeup_thread(rdev->mddev->thread);
2005 } else if (rdev->mddev->pers) {
2007 struct list_head *tmp;
2008 /* Activating a spare .. or possibly reactivating
2009 * if we every get bitmaps working here.
2012 if (rdev->raid_disk != -1)
2015 if (rdev->mddev->pers->hot_add_disk == NULL)
2018 rdev_for_each(rdev2, tmp, rdev->mddev)
2019 if (rdev2->raid_disk == slot)
2022 rdev->raid_disk = slot;
2023 if (test_bit(In_sync, &rdev->flags))
2024 rdev->saved_raid_disk = slot;
2026 rdev->saved_raid_disk = -1;
2027 err = rdev->mddev->pers->
2028 hot_add_disk(rdev->mddev, rdev);
2030 rdev->raid_disk = -1;
2033 sysfs_notify(&rdev->kobj, NULL, "state");
2034 sprintf(nm, "rd%d", rdev->raid_disk);
2035 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2037 "md: cannot register "
2039 nm, mdname(rdev->mddev));
2041 /* don't wakeup anyone, leave that to userspace. */
2043 if (slot >= rdev->mddev->raid_disks)
2045 rdev->raid_disk = slot;
2046 /* assume it is working */
2047 clear_bit(Faulty, &rdev->flags);
2048 clear_bit(WriteMostly, &rdev->flags);
2049 set_bit(In_sync, &rdev->flags);
2050 sysfs_notify(&rdev->kobj, NULL, "state");
2056 static struct rdev_sysfs_entry rdev_slot =
2057 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2060 offset_show(mdk_rdev_t *rdev, char *page)
2062 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2066 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2069 unsigned long long offset = simple_strtoull(buf, &e, 10);
2070 if (e==buf || (*e && *e != '\n'))
2072 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2074 if (rdev->size && rdev->mddev->external)
2075 /* Must set offset before size, so overlap checks
2078 rdev->data_offset = offset;
2082 static struct rdev_sysfs_entry rdev_offset =
2083 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2086 rdev_size_show(mdk_rdev_t *rdev, char *page)
2088 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2091 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2093 /* check if two start/length pairs overlap */
2102 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2104 unsigned long long size;
2105 unsigned long long oldsize = rdev->size;
2106 mddev_t *my_mddev = rdev->mddev;
2108 if (strict_strtoull(buf, 10, &size) < 0)
2110 if (size < my_mddev->size)
2112 if (my_mddev->pers && rdev->raid_disk >= 0) {
2113 if (my_mddev->persistent) {
2114 size = super_types[my_mddev->major_version].
2115 rdev_size_change(rdev, size);
2119 size = (rdev->bdev->bd_inode->i_size >> 10);
2120 size -= rdev->data_offset/2;
2122 if (size < my_mddev->size)
2123 return -EINVAL; /* component must fit device */
2127 if (size > oldsize && my_mddev->external) {
2128 /* need to check that all other rdevs with the same ->bdev
2129 * do not overlap. We need to unlock the mddev to avoid
2130 * a deadlock. We have already changed rdev->size, and if
2131 * we have to change it back, we will have the lock again.
2135 struct list_head *tmp, *tmp2;
2137 mddev_unlock(my_mddev);
2138 for_each_mddev(mddev, tmp) {
2142 rdev_for_each(rdev2, tmp2, mddev)
2143 if (test_bit(AllReserved, &rdev2->flags) ||
2144 (rdev->bdev == rdev2->bdev &&
2146 overlaps(rdev->data_offset, rdev->size,
2147 rdev2->data_offset, rdev2->size))) {
2151 mddev_unlock(mddev);
2157 mddev_lock(my_mddev);
2159 /* Someone else could have slipped in a size
2160 * change here, but doing so is just silly.
2161 * We put oldsize back because we *know* it is
2162 * safe, and trust userspace not to race with
2165 rdev->size = oldsize;
2172 static struct rdev_sysfs_entry rdev_size =
2173 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2175 static struct attribute *rdev_default_attrs[] = {
2184 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2186 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2187 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2188 mddev_t *mddev = rdev->mddev;
2194 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2196 if (rdev->mddev == NULL)
2199 rv = entry->show(rdev, page);
2200 mddev_unlock(mddev);
2206 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2207 const char *page, size_t length)
2209 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2210 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2212 mddev_t *mddev = rdev->mddev;
2216 if (!capable(CAP_SYS_ADMIN))
2218 rv = mddev ? mddev_lock(mddev): -EBUSY;
2220 if (rdev->mddev == NULL)
2223 rv = entry->store(rdev, page, length);
2224 mddev_unlock(mddev);
2229 static void rdev_free(struct kobject *ko)
2231 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2234 static struct sysfs_ops rdev_sysfs_ops = {
2235 .show = rdev_attr_show,
2236 .store = rdev_attr_store,
2238 static struct kobj_type rdev_ktype = {
2239 .release = rdev_free,
2240 .sysfs_ops = &rdev_sysfs_ops,
2241 .default_attrs = rdev_default_attrs,
2245 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2247 * mark the device faulty if:
2249 * - the device is nonexistent (zero size)
2250 * - the device has no valid superblock
2252 * a faulty rdev _never_ has rdev->sb set.
2254 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2256 char b[BDEVNAME_SIZE];
2261 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2263 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2264 return ERR_PTR(-ENOMEM);
2267 if ((err = alloc_disk_sb(rdev)))
2270 err = lock_rdev(rdev, newdev, super_format == -2);
2274 kobject_init(&rdev->kobj, &rdev_ktype);
2277 rdev->saved_raid_disk = -1;
2278 rdev->raid_disk = -1;
2280 rdev->data_offset = 0;
2281 rdev->sb_events = 0;
2282 atomic_set(&rdev->nr_pending, 0);
2283 atomic_set(&rdev->read_errors, 0);
2284 atomic_set(&rdev->corrected_errors, 0);
2286 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2289 "md: %s has zero or unknown size, marking faulty!\n",
2290 bdevname(rdev->bdev,b));
2295 if (super_format >= 0) {
2296 err = super_types[super_format].
2297 load_super(rdev, NULL, super_minor);
2298 if (err == -EINVAL) {
2300 "md: %s does not have a valid v%d.%d "
2301 "superblock, not importing!\n",
2302 bdevname(rdev->bdev,b),
2303 super_format, super_minor);
2308 "md: could not read %s's sb, not importing!\n",
2309 bdevname(rdev->bdev,b));
2314 INIT_LIST_HEAD(&rdev->same_set);
2315 init_waitqueue_head(&rdev->blocked_wait);
2320 if (rdev->sb_page) {
2326 return ERR_PTR(err);
2330 * Check a full RAID array for plausibility
2334 static void analyze_sbs(mddev_t * mddev)
2337 struct list_head *tmp;
2338 mdk_rdev_t *rdev, *freshest;
2339 char b[BDEVNAME_SIZE];
2342 rdev_for_each(rdev, tmp, mddev)
2343 switch (super_types[mddev->major_version].
2344 load_super(rdev, freshest, mddev->minor_version)) {
2352 "md: fatal superblock inconsistency in %s"
2353 " -- removing from array\n",
2354 bdevname(rdev->bdev,b));
2355 kick_rdev_from_array(rdev);
2359 super_types[mddev->major_version].
2360 validate_super(mddev, freshest);
2363 rdev_for_each(rdev, tmp, mddev) {
2364 if (rdev != freshest)
2365 if (super_types[mddev->major_version].
2366 validate_super(mddev, rdev)) {
2367 printk(KERN_WARNING "md: kicking non-fresh %s"
2369 bdevname(rdev->bdev,b));
2370 kick_rdev_from_array(rdev);
2373 if (mddev->level == LEVEL_MULTIPATH) {
2374 rdev->desc_nr = i++;
2375 rdev->raid_disk = rdev->desc_nr;
2376 set_bit(In_sync, &rdev->flags);
2377 } else if (rdev->raid_disk >= mddev->raid_disks) {
2378 rdev->raid_disk = -1;
2379 clear_bit(In_sync, &rdev->flags);
2385 if (mddev->recovery_cp != MaxSector &&
2387 printk(KERN_ERR "md: %s: raid array is not clean"
2388 " -- starting background reconstruction\n",
2394 safe_delay_show(mddev_t *mddev, char *page)
2396 int msec = (mddev->safemode_delay*1000)/HZ;
2397 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2400 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2408 /* remove a period, and count digits after it */
2409 if (len >= sizeof(buf))
2411 strlcpy(buf, cbuf, len);
2413 for (i=0; i<len; i++) {
2415 if (isdigit(buf[i])) {
2420 } else if (buf[i] == '.') {
2425 msec = simple_strtoul(buf, &e, 10);
2426 if (e == buf || (*e && *e != '\n'))
2428 msec = (msec * 1000) / scale;
2430 mddev->safemode_delay = 0;
2432 mddev->safemode_delay = (msec*HZ)/1000;
2433 if (mddev->safemode_delay == 0)
2434 mddev->safemode_delay = 1;
2438 static struct md_sysfs_entry md_safe_delay =
2439 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2442 level_show(mddev_t *mddev, char *page)
2444 struct mdk_personality *p = mddev->pers;
2446 return sprintf(page, "%s\n", p->name);
2447 else if (mddev->clevel[0])
2448 return sprintf(page, "%s\n", mddev->clevel);
2449 else if (mddev->level != LEVEL_NONE)
2450 return sprintf(page, "%d\n", mddev->level);
2456 level_store(mddev_t *mddev, const char *buf, size_t len)
2463 if (len >= sizeof(mddev->clevel))
2465 strncpy(mddev->clevel, buf, len);
2466 if (mddev->clevel[len-1] == '\n')
2468 mddev->clevel[len] = 0;
2469 mddev->level = LEVEL_NONE;
2473 static struct md_sysfs_entry md_level =
2474 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2478 layout_show(mddev_t *mddev, char *page)
2480 /* just a number, not meaningful for all levels */
2481 if (mddev->reshape_position != MaxSector &&
2482 mddev->layout != mddev->new_layout)
2483 return sprintf(page, "%d (%d)\n",
2484 mddev->new_layout, mddev->layout);
2485 return sprintf(page, "%d\n", mddev->layout);
2489 layout_store(mddev_t *mddev, const char *buf, size_t len)
2492 unsigned long n = simple_strtoul(buf, &e, 10);
2494 if (!*buf || (*e && *e != '\n'))
2499 if (mddev->reshape_position != MaxSector)
2500 mddev->new_layout = n;
2505 static struct md_sysfs_entry md_layout =
2506 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2510 raid_disks_show(mddev_t *mddev, char *page)
2512 if (mddev->raid_disks == 0)
2514 if (mddev->reshape_position != MaxSector &&
2515 mddev->delta_disks != 0)
2516 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2517 mddev->raid_disks - mddev->delta_disks);
2518 return sprintf(page, "%d\n", mddev->raid_disks);
2521 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2524 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2528 unsigned long n = simple_strtoul(buf, &e, 10);
2530 if (!*buf || (*e && *e != '\n'))
2534 rv = update_raid_disks(mddev, n);
2535 else if (mddev->reshape_position != MaxSector) {
2536 int olddisks = mddev->raid_disks - mddev->delta_disks;
2537 mddev->delta_disks = n - olddisks;
2538 mddev->raid_disks = n;
2540 mddev->raid_disks = n;
2541 return rv ? rv : len;
2543 static struct md_sysfs_entry md_raid_disks =
2544 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2547 chunk_size_show(mddev_t *mddev, char *page)
2549 if (mddev->reshape_position != MaxSector &&
2550 mddev->chunk_size != mddev->new_chunk)
2551 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2553 return sprintf(page, "%d\n", mddev->chunk_size);
2557 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2559 /* can only set chunk_size if array is not yet active */
2561 unsigned long n = simple_strtoul(buf, &e, 10);
2563 if (!*buf || (*e && *e != '\n'))
2568 else if (mddev->reshape_position != MaxSector)
2569 mddev->new_chunk = n;
2571 mddev->chunk_size = n;
2574 static struct md_sysfs_entry md_chunk_size =
2575 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2578 resync_start_show(mddev_t *mddev, char *page)
2580 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2584 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2587 unsigned long long n = simple_strtoull(buf, &e, 10);
2591 if (!*buf || (*e && *e != '\n'))
2594 mddev->recovery_cp = n;
2597 static struct md_sysfs_entry md_resync_start =
2598 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2601 * The array state can be:
2604 * No devices, no size, no level
2605 * Equivalent to STOP_ARRAY ioctl
2607 * May have some settings, but array is not active
2608 * all IO results in error
2609 * When written, doesn't tear down array, but just stops it
2610 * suspended (not supported yet)
2611 * All IO requests will block. The array can be reconfigured.
2612 * Writing this, if accepted, will block until array is quiescent
2614 * no resync can happen. no superblocks get written.
2615 * write requests fail
2617 * like readonly, but behaves like 'clean' on a write request.
2619 * clean - no pending writes, but otherwise active.
2620 * When written to inactive array, starts without resync
2621 * If a write request arrives then
2622 * if metadata is known, mark 'dirty' and switch to 'active'.
2623 * if not known, block and switch to write-pending
2624 * If written to an active array that has pending writes, then fails.
2626 * fully active: IO and resync can be happening.
2627 * When written to inactive array, starts with resync
2630 * clean, but writes are blocked waiting for 'active' to be written.
2633 * like active, but no writes have been seen for a while (100msec).
2636 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2637 write_pending, active_idle, bad_word};
2638 static char *array_states[] = {
2639 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2640 "write-pending", "active-idle", NULL };
2642 static int match_word(const char *word, char **list)
2645 for (n=0; list[n]; n++)
2646 if (cmd_match(word, list[n]))
2652 array_state_show(mddev_t *mddev, char *page)
2654 enum array_state st = inactive;
2667 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2669 else if (mddev->safemode)
2675 if (list_empty(&mddev->disks) &&
2676 mddev->raid_disks == 0 &&
2682 return sprintf(page, "%s\n", array_states[st]);
2685 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
2686 static int do_md_run(mddev_t * mddev);
2687 static int restart_array(mddev_t *mddev);
2690 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2693 enum array_state st = match_word(buf, array_states);
2698 /* stopping an active array */
2699 if (atomic_read(&mddev->active) > 1)
2701 err = do_md_stop(mddev, 0, 0);
2704 /* stopping an active array */
2706 if (atomic_read(&mddev->active) > 1)
2708 err = do_md_stop(mddev, 2, 0);
2710 err = 0; /* already inactive */
2713 break; /* not supported yet */
2716 err = do_md_stop(mddev, 1, 0);
2719 set_disk_ro(mddev->gendisk, 1);
2720 err = do_md_run(mddev);
2726 err = do_md_stop(mddev, 1, 0);
2728 err = restart_array(mddev);
2731 set_disk_ro(mddev->gendisk, 0);
2735 err = do_md_run(mddev);
2740 restart_array(mddev);
2741 spin_lock_irq(&mddev->write_lock);
2742 if (atomic_read(&mddev->writes_pending) == 0) {
2743 if (mddev->in_sync == 0) {
2745 if (mddev->safemode == 1)
2746 mddev->safemode = 0;
2747 if (mddev->persistent)
2748 set_bit(MD_CHANGE_CLEAN,
2754 spin_unlock_irq(&mddev->write_lock);
2757 mddev->recovery_cp = MaxSector;
2758 err = do_md_run(mddev);
2763 restart_array(mddev);
2764 if (mddev->external)
2765 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2766 wake_up(&mddev->sb_wait);
2770 set_disk_ro(mddev->gendisk, 0);
2771 err = do_md_run(mddev);
2776 /* these cannot be set */
2782 sysfs_notify(&mddev->kobj, NULL, "array_state");
2786 static struct md_sysfs_entry md_array_state =
2787 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2790 null_show(mddev_t *mddev, char *page)
2796 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2798 /* buf must be %d:%d\n? giving major and minor numbers */
2799 /* The new device is added to the array.
2800 * If the array has a persistent superblock, we read the
2801 * superblock to initialise info and check validity.
2802 * Otherwise, only checking done is that in bind_rdev_to_array,
2803 * which mainly checks size.
2806 int major = simple_strtoul(buf, &e, 10);
2812 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2814 minor = simple_strtoul(e+1, &e, 10);
2815 if (*e && *e != '\n')
2817 dev = MKDEV(major, minor);
2818 if (major != MAJOR(dev) ||
2819 minor != MINOR(dev))
2823 if (mddev->persistent) {
2824 rdev = md_import_device(dev, mddev->major_version,
2825 mddev->minor_version);
2826 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2827 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2828 mdk_rdev_t, same_set);
2829 err = super_types[mddev->major_version]
2830 .load_super(rdev, rdev0, mddev->minor_version);
2834 } else if (mddev->external)
2835 rdev = md_import_device(dev, -2, -1);
2837 rdev = md_import_device(dev, -1, -1);
2840 return PTR_ERR(rdev);
2841 err = bind_rdev_to_array(rdev, mddev);
2845 return err ? err : len;
2848 static struct md_sysfs_entry md_new_device =
2849 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2852 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2855 unsigned long chunk, end_chunk;
2859 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2861 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2862 if (buf == end) break;
2863 if (*end == '-') { /* range */
2865 end_chunk = simple_strtoul(buf, &end, 0);
2866 if (buf == end) break;
2868 if (*end && !isspace(*end)) break;
2869 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2871 while (isspace(*buf)) buf++;
2873 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2878 static struct md_sysfs_entry md_bitmap =
2879 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2882 size_show(mddev_t *mddev, char *page)
2884 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2887 static int update_size(mddev_t *mddev, sector_t num_sectors);
2890 size_store(mddev_t *mddev, const char *buf, size_t len)
2892 /* If array is inactive, we can reduce the component size, but
2893 * not increase it (except from 0).
2894 * If array is active, we can try an on-line resize
2898 unsigned long long size = simple_strtoull(buf, &e, 10);
2899 if (!*buf || *buf == '\n' ||
2904 err = update_size(mddev, size * 2);
2905 md_update_sb(mddev, 1);
2907 if (mddev->size == 0 ||
2913 return err ? err : len;
2916 static struct md_sysfs_entry md_size =
2917 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2922 * 'none' for arrays with no metadata (good luck...)
2923 * 'external' for arrays with externally managed metadata,
2924 * or N.M for internally known formats
2927 metadata_show(mddev_t *mddev, char *page)
2929 if (mddev->persistent)
2930 return sprintf(page, "%d.%d\n",
2931 mddev->major_version, mddev->minor_version);
2932 else if (mddev->external)
2933 return sprintf(page, "external:%s\n", mddev->metadata_type);
2935 return sprintf(page, "none\n");
2939 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2943 if (!list_empty(&mddev->disks))
2946 if (cmd_match(buf, "none")) {
2947 mddev->persistent = 0;
2948 mddev->external = 0;
2949 mddev->major_version = 0;
2950 mddev->minor_version = 90;
2953 if (strncmp(buf, "external:", 9) == 0) {
2954 size_t namelen = len-9;
2955 if (namelen >= sizeof(mddev->metadata_type))
2956 namelen = sizeof(mddev->metadata_type)-1;
2957 strncpy(mddev->metadata_type, buf+9, namelen);
2958 mddev->metadata_type[namelen] = 0;
2959 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2960 mddev->metadata_type[--namelen] = 0;
2961 mddev->persistent = 0;
2962 mddev->external = 1;
2963 mddev->major_version = 0;
2964 mddev->minor_version = 90;
2967 major = simple_strtoul(buf, &e, 10);
2968 if (e==buf || *e != '.')
2971 minor = simple_strtoul(buf, &e, 10);
2972 if (e==buf || (*e && *e != '\n') )
2974 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2976 mddev->major_version = major;
2977 mddev->minor_version = minor;
2978 mddev->persistent = 1;
2979 mddev->external = 0;
2983 static struct md_sysfs_entry md_metadata =
2984 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2987 action_show(mddev_t *mddev, char *page)
2989 char *type = "idle";
2990 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2991 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2992 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2994 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2995 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2997 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3001 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3004 return sprintf(page, "%s\n", type);
3008 action_store(mddev_t *mddev, const char *page, size_t len)
3010 if (!mddev->pers || !mddev->pers->sync_request)
3013 if (cmd_match(page, "idle")) {
3014 if (mddev->sync_thread) {
3015 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3016 md_unregister_thread(mddev->sync_thread);
3017 mddev->sync_thread = NULL;
3018 mddev->recovery = 0;
3020 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3021 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3023 else if (cmd_match(page, "resync"))
3024 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3025 else if (cmd_match(page, "recover")) {
3026 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3027 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3028 } else if (cmd_match(page, "reshape")) {
3030 if (mddev->pers->start_reshape == NULL)
3032 err = mddev->pers->start_reshape(mddev);
3035 sysfs_notify(&mddev->kobj, NULL, "degraded");
3037 if (cmd_match(page, "check"))
3038 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3039 else if (!cmd_match(page, "repair"))
3041 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3042 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3044 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3045 md_wakeup_thread(mddev->thread);
3046 sysfs_notify(&mddev->kobj, NULL, "sync_action");
3051 mismatch_cnt_show(mddev_t *mddev, char *page)
3053 return sprintf(page, "%llu\n",
3054 (unsigned long long) mddev->resync_mismatches);
3057 static struct md_sysfs_entry md_scan_mode =
3058 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3061 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3064 sync_min_show(mddev_t *mddev, char *page)
3066 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3067 mddev->sync_speed_min ? "local": "system");
3071 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3075 if (strncmp(buf, "system", 6)==0) {
3076 mddev->sync_speed_min = 0;
3079 min = simple_strtoul(buf, &e, 10);
3080 if (buf == e || (*e && *e != '\n') || min <= 0)
3082 mddev->sync_speed_min = min;
3086 static struct md_sysfs_entry md_sync_min =
3087 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3090 sync_max_show(mddev_t *mddev, char *page)
3092 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3093 mddev->sync_speed_max ? "local": "system");
3097 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3101 if (strncmp(buf, "system", 6)==0) {
3102 mddev->sync_speed_max = 0;
3105 max = simple_strtoul(buf, &e, 10);
3106 if (buf == e || (*e && *e != '\n') || max <= 0)
3108 mddev->sync_speed_max = max;
3112 static struct md_sysfs_entry md_sync_max =
3113 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3116 degraded_show(mddev_t *mddev, char *page)
3118 return sprintf(page, "%d\n", mddev->degraded);
3120 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3123 sync_force_parallel_show(mddev_t *mddev, char *page)
3125 return sprintf(page, "%d\n", mddev->parallel_resync);
3129 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3133 if (strict_strtol(buf, 10, &n))
3136 if (n != 0 && n != 1)
3139 mddev->parallel_resync = n;
3141 if (mddev->sync_thread)
3142 wake_up(&resync_wait);
3147 /* force parallel resync, even with shared block devices */
3148 static struct md_sysfs_entry md_sync_force_parallel =
3149 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3150 sync_force_parallel_show, sync_force_parallel_store);
3153 sync_speed_show(mddev_t *mddev, char *page)
3155 unsigned long resync, dt, db;
3156 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3157 dt = (jiffies - mddev->resync_mark) / HZ;
3159 db = resync - mddev->resync_mark_cnt;
3160 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3163 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3166 sync_completed_show(mddev_t *mddev, char *page)
3168 unsigned long max_blocks, resync;
3170 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3171 max_blocks = mddev->resync_max_sectors;
3173 max_blocks = mddev->size << 1;
3175 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3176 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3179 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3182 min_sync_show(mddev_t *mddev, char *page)
3184 return sprintf(page, "%llu\n",
3185 (unsigned long long)mddev->resync_min);
3188 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3190 unsigned long long min;
3191 if (strict_strtoull(buf, 10, &min))
3193 if (min > mddev->resync_max)
3195 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3198 /* Must be a multiple of chunk_size */
3199 if (mddev->chunk_size) {
3200 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3203 mddev->resync_min = min;
3208 static struct md_sysfs_entry md_min_sync =
3209 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3212 max_sync_show(mddev_t *mddev, char *page)
3214 if (mddev->resync_max == MaxSector)
3215 return sprintf(page, "max\n");
3217 return sprintf(page, "%llu\n",
3218 (unsigned long long)mddev->resync_max);
3221 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3223 if (strncmp(buf, "max", 3) == 0)
3224 mddev->resync_max = MaxSector;
3226 unsigned long long max;
3227 if (strict_strtoull(buf, 10, &max))
3229 if (max < mddev->resync_min)
3231 if (max < mddev->resync_max &&
3232 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3235 /* Must be a multiple of chunk_size */
3236 if (mddev->chunk_size) {
3237 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3240 mddev->resync_max = max;
3242 wake_up(&mddev->recovery_wait);
3246 static struct md_sysfs_entry md_max_sync =
3247 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3250 suspend_lo_show(mddev_t *mddev, char *page)
3252 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3256 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3259 unsigned long long new = simple_strtoull(buf, &e, 10);
3261 if (mddev->pers->quiesce == NULL)
3263 if (buf == e || (*e && *e != '\n'))
3265 if (new >= mddev->suspend_hi ||
3266 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3267 mddev->suspend_lo = new;
3268 mddev->pers->quiesce(mddev, 2);
3273 static struct md_sysfs_entry md_suspend_lo =
3274 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3278 suspend_hi_show(mddev_t *mddev, char *page)
3280 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3284 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3287 unsigned long long new = simple_strtoull(buf, &e, 10);
3289 if (mddev->pers->quiesce == NULL)
3291 if (buf == e || (*e && *e != '\n'))
3293 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3294 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3295 mddev->suspend_hi = new;
3296 mddev->pers->quiesce(mddev, 1);
3297 mddev->pers->quiesce(mddev, 0);
3302 static struct md_sysfs_entry md_suspend_hi =
3303 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3306 reshape_position_show(mddev_t *mddev, char *page)
3308 if (mddev->reshape_position != MaxSector)
3309 return sprintf(page, "%llu\n",
3310 (unsigned long long)mddev->reshape_position);
3311 strcpy(page, "none\n");
3316 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3319 unsigned long long new = simple_strtoull(buf, &e, 10);
3322 if (buf == e || (*e && *e != '\n'))
3324 mddev->reshape_position = new;
3325 mddev->delta_disks = 0;
3326 mddev->new_level = mddev->level;
3327 mddev->new_layout = mddev->layout;
3328 mddev->new_chunk = mddev->chunk_size;
3332 static struct md_sysfs_entry md_reshape_position =
3333 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3334 reshape_position_store);
3337 static struct attribute *md_default_attrs[] = {
3340 &md_raid_disks.attr,
3341 &md_chunk_size.attr,
3343 &md_resync_start.attr,
3345 &md_new_device.attr,
3346 &md_safe_delay.attr,
3347 &md_array_state.attr,
3348 &md_reshape_position.attr,
3352 static struct attribute *md_redundancy_attrs[] = {
3354 &md_mismatches.attr,
3357 &md_sync_speed.attr,
3358 &md_sync_force_parallel.attr,
3359 &md_sync_completed.attr,
3362 &md_suspend_lo.attr,
3363 &md_suspend_hi.attr,
3368 static struct attribute_group md_redundancy_group = {
3370 .attrs = md_redundancy_attrs,
3375 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3377 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3378 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3383 rv = mddev_lock(mddev);
3385 rv = entry->show(mddev, page);
3386 mddev_unlock(mddev);
3392 md_attr_store(struct kobject *kobj, struct attribute *attr,
3393 const char *page, size_t length)
3395 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3396 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3401 if (!capable(CAP_SYS_ADMIN))
3403 rv = mddev_lock(mddev);
3405 rv = entry->store(mddev, page, length);
3406 mddev_unlock(mddev);
3411 static void md_free(struct kobject *ko)
3413 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3417 static struct sysfs_ops md_sysfs_ops = {
3418 .show = md_attr_show,
3419 .store = md_attr_store,
3421 static struct kobj_type md_ktype = {
3423 .sysfs_ops = &md_sysfs_ops,
3424 .default_attrs = md_default_attrs,
3429 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3431 static DEFINE_MUTEX(disks_mutex);
3432 mddev_t *mddev = mddev_find(dev);
3433 struct gendisk *disk;
3434 int partitioned = (MAJOR(dev) != MD_MAJOR);
3435 int shift = partitioned ? MdpMinorShift : 0;
3436 int unit = MINOR(dev) >> shift;
3442 mutex_lock(&disks_mutex);
3443 if (mddev->gendisk) {
3444 mutex_unlock(&disks_mutex);
3448 disk = alloc_disk(1 << shift);
3450 mutex_unlock(&disks_mutex);
3454 disk->major = MAJOR(dev);
3455 disk->first_minor = unit << shift;
3457 sprintf(disk->disk_name, "md_d%d", unit);
3459 sprintf(disk->disk_name, "md%d", unit);
3460 disk->fops = &md_fops;
3461 disk->private_data = mddev;
3462 disk->queue = mddev->queue;
3464 mddev->gendisk = disk;
3465 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3467 mutex_unlock(&disks_mutex);
3469 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3472 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3476 static void md_safemode_timeout(unsigned long data)
3478 mddev_t *mddev = (mddev_t *) data;
3480 if (!atomic_read(&mddev->writes_pending)) {
3481 mddev->safemode = 1;
3482 if (mddev->external)
3483 sysfs_notify(&mddev->kobj, NULL, "array_state");
3485 md_wakeup_thread(mddev->thread);
3488 static int start_dirty_degraded;
3490 static int do_md_run(mddev_t * mddev)
3494 struct list_head *tmp;
3496 struct gendisk *disk;
3497 struct mdk_personality *pers;
3498 char b[BDEVNAME_SIZE];
3500 if (list_empty(&mddev->disks))
3501 /* cannot run an array with no devices.. */
3508 * Analyze all RAID superblock(s)
3510 if (!mddev->raid_disks) {
3511 if (!mddev->persistent)
3516 chunk_size = mddev->chunk_size;
3519 if (chunk_size > MAX_CHUNK_SIZE) {
3520 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3521 chunk_size, MAX_CHUNK_SIZE);
3525 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3527 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3528 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3531 if (chunk_size < PAGE_SIZE) {
3532 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3533 chunk_size, PAGE_SIZE);
3537 /* devices must have minimum size of one chunk */
3538 rdev_for_each(rdev, tmp, mddev) {
3539 if (test_bit(Faulty, &rdev->flags))
3541 if (rdev->size < chunk_size / 1024) {
3543 "md: Dev %s smaller than chunk_size:"
3545 bdevname(rdev->bdev,b),
3546 (unsigned long long)rdev->size,
3554 if (mddev->level != LEVEL_NONE)
3555 request_module("md-level-%d", mddev->level);
3556 else if (mddev->clevel[0])
3557 request_module("md-%s", mddev->clevel);
3561 * Drop all container device buffers, from now on
3562 * the only valid external interface is through the md
3565 rdev_for_each(rdev, tmp, mddev) {
3566 if (test_bit(Faulty, &rdev->flags))
3568 sync_blockdev(rdev->bdev);
3569 invalidate_bdev(rdev->bdev);
3571 /* perform some consistency tests on the device.
3572 * We don't want the data to overlap the metadata,
3573 * Internal Bitmap issues has handled elsewhere.
3575 if (rdev->data_offset < rdev->sb_start) {
3577 rdev->data_offset + mddev->size*2
3579 printk("md: %s: data overlaps metadata\n",
3584 if (rdev->sb_start + rdev->sb_size/512
3585 > rdev->data_offset) {
3586 printk("md: %s: metadata overlaps data\n",
3591 sysfs_notify(&rdev->kobj, NULL, "state");
3594 md_probe(mddev->unit, NULL, NULL);
3595 disk = mddev->gendisk;
3599 spin_lock(&pers_lock);
3600 pers = find_pers(mddev->level, mddev->clevel);
3601 if (!pers || !try_module_get(pers->owner)) {
3602 spin_unlock(&pers_lock);
3603 if (mddev->level != LEVEL_NONE)
3604 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3607 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3612 spin_unlock(&pers_lock);
3613 mddev->level = pers->level;
3614 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3616 if (mddev->reshape_position != MaxSector &&
3617 pers->start_reshape == NULL) {
3618 /* This personality cannot handle reshaping... */
3620 module_put(pers->owner);
3624 if (pers->sync_request) {
3625 /* Warn if this is a potentially silly
3628 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3630 struct list_head *tmp2;
3632 rdev_for_each(rdev, tmp, mddev) {
3633 rdev_for_each(rdev2, tmp2, mddev) {
3635 rdev->bdev->bd_contains ==
3636 rdev2->bdev->bd_contains) {
3638 "%s: WARNING: %s appears to be"
3639 " on the same physical disk as"
3642 bdevname(rdev->bdev,b),
3643 bdevname(rdev2->bdev,b2));
3650 "True protection against single-disk"
3651 " failure might be compromised.\n");
3654 mddev->recovery = 0;
3655 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3656 mddev->barriers_work = 1;
3657 mddev->ok_start_degraded = start_dirty_degraded;
3660 mddev->ro = 2; /* read-only, but switch on first write */
3662 err = mddev->pers->run(mddev);
3664 printk(KERN_ERR "md: pers->run() failed ...\n");
3665 else if (mddev->pers->sync_request) {
3666 err = bitmap_create(mddev);
3668 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3669 mdname(mddev), err);
3670 mddev->pers->stop(mddev);
3674 module_put(mddev->pers->owner);
3676 bitmap_destroy(mddev);
3679 if (mddev->pers->sync_request) {
3680 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3682 "md: cannot register extra attributes for %s\n",
3684 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3687 atomic_set(&mddev->writes_pending,0);
3688 mddev->safemode = 0;
3689 mddev->safemode_timer.function = md_safemode_timeout;
3690 mddev->safemode_timer.data = (unsigned long) mddev;
3691 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3694 rdev_for_each(rdev, tmp, mddev)
3695 if (rdev->raid_disk >= 0) {
3697 sprintf(nm, "rd%d", rdev->raid_disk);
3698 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3699 printk("md: cannot register %s for %s\n",
3703 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3706 md_update_sb(mddev, 0);
3708 set_capacity(disk, mddev->array_size<<1);
3710 /* If we call blk_queue_make_request here, it will
3711 * re-initialise max_sectors etc which may have been
3712 * refined inside -> run. So just set the bits we need to set.
3713 * Most initialisation happended when we called
3714 * blk_queue_make_request(..., md_fail_request)
3717 mddev->queue->queuedata = mddev;
3718 mddev->queue->make_request_fn = mddev->pers->make_request;
3720 /* If there is a partially-recovered drive we need to
3721 * start recovery here. If we leave it to md_check_recovery,
3722 * it will remove the drives and not do the right thing
3724 if (mddev->degraded && !mddev->sync_thread) {
3725 struct list_head *rtmp;
3727 rdev_for_each(rdev, rtmp, mddev)
3728 if (rdev->raid_disk >= 0 &&
3729 !test_bit(In_sync, &rdev->flags) &&
3730 !test_bit(Faulty, &rdev->flags))
3731 /* complete an interrupted recovery */
3733 if (spares && mddev->pers->sync_request) {
3734 mddev->recovery = 0;
3735 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3736 mddev->sync_thread = md_register_thread(md_do_sync,
3739 if (!mddev->sync_thread) {
3740 printk(KERN_ERR "%s: could not start resync"
3743 /* leave the spares where they are, it shouldn't hurt */
3744 mddev->recovery = 0;
3748 md_wakeup_thread(mddev->thread);
3749 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3752 md_new_event(mddev);
3753 sysfs_notify(&mddev->kobj, NULL, "array_state");
3754 sysfs_notify(&mddev->kobj, NULL, "sync_action");
3755 sysfs_notify(&mddev->kobj, NULL, "degraded");
3756 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
3760 static int restart_array(mddev_t *mddev)
3762 struct gendisk *disk = mddev->gendisk;
3764 /* Complain if it has no devices */
3765 if (list_empty(&mddev->disks))
3771 mddev->safemode = 0;
3773 set_disk_ro(disk, 0);
3774 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3776 /* Kick recovery or resync if necessary */
3777 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3778 md_wakeup_thread(mddev->thread);
3779 md_wakeup_thread(mddev->sync_thread);
3780 sysfs_notify(&mddev->kobj, NULL, "array_state");
3784 /* similar to deny_write_access, but accounts for our holding a reference
3785 * to the file ourselves */
3786 static int deny_bitmap_write_access(struct file * file)
3788 struct inode *inode = file->f_mapping->host;
3790 spin_lock(&inode->i_lock);
3791 if (atomic_read(&inode->i_writecount) > 1) {
3792 spin_unlock(&inode->i_lock);
3795 atomic_set(&inode->i_writecount, -1);
3796 spin_unlock(&inode->i_lock);
3801 static void restore_bitmap_write_access(struct file *file)
3803 struct inode *inode = file->f_mapping->host;
3805 spin_lock(&inode->i_lock);
3806 atomic_set(&inode->i_writecount, 1);
3807 spin_unlock(&inode->i_lock);
3811 * 0 - completely stop and dis-assemble array
3812 * 1 - switch to readonly
3813 * 2 - stop but do not disassemble array
3815 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
3818 struct gendisk *disk = mddev->gendisk;
3820 if (atomic_read(&mddev->active) > 1 + is_open) {
3821 printk("md: %s still in use.\n",mdname(mddev));
3827 if (mddev->sync_thread) {
3828 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3829 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3830 md_unregister_thread(mddev->sync_thread);
3831 mddev->sync_thread = NULL;
3834 del_timer_sync(&mddev->safemode_timer);
3836 invalidate_partition(disk, 0);
3839 case 1: /* readonly */
3845 case 0: /* disassemble */
3847 bitmap_flush(mddev);
3848 md_super_wait(mddev);
3850 set_disk_ro(disk, 0);
3851 blk_queue_make_request(mddev->queue, md_fail_request);
3852 mddev->pers->stop(mddev);
3853 mddev->queue->merge_bvec_fn = NULL;
3854 mddev->queue->unplug_fn = NULL;
3855 mddev->queue->backing_dev_info.congested_fn = NULL;
3856 if (mddev->pers->sync_request)
3857 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3859 module_put(mddev->pers->owner);
3861 /* tell userspace to handle 'inactive' */
3862 sysfs_notify(&mddev->kobj, NULL, "array_state");
3864 set_capacity(disk, 0);
3870 if (!mddev->in_sync || mddev->flags) {
3871 /* mark array as shutdown cleanly */
3873 md_update_sb(mddev, 1);
3876 set_disk_ro(disk, 1);
3877 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3881 * Free resources if final stop
3885 struct list_head *tmp;
3887 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3889 bitmap_destroy(mddev);
3890 if (mddev->bitmap_file) {
3891 restore_bitmap_write_access(mddev->bitmap_file);
3892 fput(mddev->bitmap_file);
3893 mddev->bitmap_file = NULL;
3895 mddev->bitmap_offset = 0;
3897 rdev_for_each(rdev, tmp, mddev)
3898 if (rdev->raid_disk >= 0) {
3900 sprintf(nm, "rd%d", rdev->raid_disk);
3901 sysfs_remove_link(&mddev->kobj, nm);
3904 /* make sure all md_delayed_delete calls have finished */
3905 flush_scheduled_work();
3907 export_array(mddev);
3909 mddev->array_size = 0;
3911 mddev->raid_disks = 0;
3912 mddev->recovery_cp = 0;
3913 mddev->resync_min = 0;
3914 mddev->resync_max = MaxSector;
3915 mddev->reshape_position = MaxSector;
3916 mddev->external = 0;
3917 mddev->persistent = 0;
3918 mddev->level = LEVEL_NONE;
3919 mddev->clevel[0] = 0;
3922 mddev->metadata_type[0] = 0;
3923 mddev->chunk_size = 0;
3924 mddev->ctime = mddev->utime = 0;
3926 mddev->max_disks = 0;
3928 mddev->delta_disks = 0;
3929 mddev->new_level = LEVEL_NONE;
3930 mddev->new_layout = 0;
3931 mddev->new_chunk = 0;
3932 mddev->curr_resync = 0;
3933 mddev->resync_mismatches = 0;
3934 mddev->suspend_lo = mddev->suspend_hi = 0;
3935 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3936 mddev->recovery = 0;
3939 mddev->degraded = 0;
3940 mddev->barriers_work = 0;
3941 mddev->safemode = 0;
3943 } else if (mddev->pers)
3944 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3947 md_new_event(mddev);
3948 sysfs_notify(&mddev->kobj, NULL, "array_state");
3954 static void autorun_array(mddev_t *mddev)
3957 struct list_head *tmp;
3960 if (list_empty(&mddev->disks))
3963 printk(KERN_INFO "md: running: ");
3965 rdev_for_each(rdev, tmp, mddev) {
3966 char b[BDEVNAME_SIZE];
3967 printk("<%s>", bdevname(rdev->bdev,b));
3971 err = do_md_run (mddev);
3973 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3974 do_md_stop (mddev, 0, 0);
3979 * lets try to run arrays based on all disks that have arrived
3980 * until now. (those are in pending_raid_disks)
3982 * the method: pick the first pending disk, collect all disks with
3983 * the same UUID, remove all from the pending list and put them into
3984 * the 'same_array' list. Then order this list based on superblock
3985 * update time (freshest comes first), kick out 'old' disks and
3986 * compare superblocks. If everything's fine then run it.
3988 * If "unit" is allocated, then bump its reference count
3990 static void autorun_devices(int part)
3992 struct list_head *tmp;
3993 mdk_rdev_t *rdev0, *rdev;
3995 char b[BDEVNAME_SIZE];
3997 printk(KERN_INFO "md: autorun ...\n");
3998 while (!list_empty(&pending_raid_disks)) {
4001 LIST_HEAD(candidates);
4002 rdev0 = list_entry(pending_raid_disks.next,
4003 mdk_rdev_t, same_set);
4005 printk(KERN_INFO "md: considering %s ...\n",
4006 bdevname(rdev0->bdev,b));
4007 INIT_LIST_HEAD(&candidates);
4008 rdev_for_each_list(rdev, tmp, pending_raid_disks)
4009 if (super_90_load(rdev, rdev0, 0) >= 0) {
4010 printk(KERN_INFO "md: adding %s ...\n",
4011 bdevname(rdev->bdev,b));
4012 list_move(&rdev->same_set, &candidates);
4015 * now we have a set of devices, with all of them having
4016 * mostly sane superblocks. It's time to allocate the
4020 dev = MKDEV(mdp_major,
4021 rdev0->preferred_minor << MdpMinorShift);
4022 unit = MINOR(dev) >> MdpMinorShift;
4024 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4027 if (rdev0->preferred_minor != unit) {
4028 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4029 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4033 md_probe(dev, NULL, NULL);
4034 mddev = mddev_find(dev);
4035 if (!mddev || !mddev->gendisk) {
4039 "md: cannot allocate memory for md drive.\n");
4042 if (mddev_lock(mddev))
4043 printk(KERN_WARNING "md: %s locked, cannot run\n",
4045 else if (mddev->raid_disks || mddev->major_version
4046 || !list_empty(&mddev->disks)) {
4048 "md: %s already running, cannot run %s\n",
4049 mdname(mddev), bdevname(rdev0->bdev,b));
4050 mddev_unlock(mddev);
4052 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4053 mddev->persistent = 1;
4054 rdev_for_each_list(rdev, tmp, candidates) {
4055 list_del_init(&rdev->same_set);
4056 if (bind_rdev_to_array(rdev, mddev))
4059 autorun_array(mddev);
4060 mddev_unlock(mddev);
4062 /* on success, candidates will be empty, on error
4065 rdev_for_each_list(rdev, tmp, candidates)
4069 printk(KERN_INFO "md: ... autorun DONE.\n");
4071 #endif /* !MODULE */
4073 static int get_version(void __user * arg)
4077 ver.major = MD_MAJOR_VERSION;
4078 ver.minor = MD_MINOR_VERSION;
4079 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4081 if (copy_to_user(arg, &ver, sizeof(ver)))
4087 static int get_array_info(mddev_t * mddev, void __user * arg)
4089 mdu_array_info_t info;
4090 int nr,working,active,failed,spare;
4092 struct list_head *tmp;
4094 nr=working=active=failed=spare=0;
4095 rdev_for_each(rdev, tmp, mddev) {
4097 if (test_bit(Faulty, &rdev->flags))
4101 if (test_bit(In_sync, &rdev->flags))
4108 info.major_version = mddev->major_version;
4109 info.minor_version = mddev->minor_version;
4110 info.patch_version = MD_PATCHLEVEL_VERSION;
4111 info.ctime = mddev->ctime;
4112 info.level = mddev->level;
4113 info.size = mddev->size;
4114 if (info.size != mddev->size) /* overflow */
4117 info.raid_disks = mddev->raid_disks;
4118 info.md_minor = mddev->md_minor;
4119 info.not_persistent= !mddev->persistent;
4121 info.utime = mddev->utime;
4124 info.state = (1<<MD_SB_CLEAN);
4125 if (mddev->bitmap && mddev->bitmap_offset)
4126 info.state = (1<<MD_SB_BITMAP_PRESENT);
4127 info.active_disks = active;
4128 info.working_disks = working;
4129 info.failed_disks = failed;
4130 info.spare_disks = spare;
4132 info.layout = mddev->layout;
4133 info.chunk_size = mddev->chunk_size;
4135 if (copy_to_user(arg, &info, sizeof(info)))
4141 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4143 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4144 char *ptr, *buf = NULL;
4147 if (md_allow_write(mddev))
4148 file = kmalloc(sizeof(*file), GFP_NOIO);
4150 file = kmalloc(sizeof(*file), GFP_KERNEL);
4155 /* bitmap disabled, zero the first byte and copy out */
4156 if (!mddev->bitmap || !mddev->bitmap->file) {
4157 file->pathname[0] = '\0';
4161 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4165 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4169 strcpy(file->pathname, ptr);
4173 if (copy_to_user(arg, file, sizeof(*file)))
4181 static int get_disk_info(mddev_t * mddev, void __user * arg)
4183 mdu_disk_info_t info;
4186 if (copy_from_user(&info, arg, sizeof(info)))
4189 rdev = find_rdev_nr(mddev, info.number);
4191 info.major = MAJOR(rdev->bdev->bd_dev);
4192 info.minor = MINOR(rdev->bdev->bd_dev);
4193 info.raid_disk = rdev->raid_disk;
4195 if (test_bit(Faulty, &rdev->flags))
4196 info.state |= (1<<MD_DISK_FAULTY);
4197 else if (test_bit(In_sync, &rdev->flags)) {
4198 info.state |= (1<<MD_DISK_ACTIVE);
4199 info.state |= (1<<MD_DISK_SYNC);
4201 if (test_bit(WriteMostly, &rdev->flags))
4202 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4204 info.major = info.minor = 0;
4205 info.raid_disk = -1;
4206 info.state = (1<<MD_DISK_REMOVED);
4209 if (copy_to_user(arg, &info, sizeof(info)))
4215 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4217 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4219 dev_t dev = MKDEV(info->major,info->minor);
4221 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4224 if (!mddev->raid_disks) {
4226 /* expecting a device which has a superblock */
4227 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4230 "md: md_import_device returned %ld\n",
4232 return PTR_ERR(rdev);
4234 if (!list_empty(&mddev->disks)) {
4235 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4236 mdk_rdev_t, same_set);
4237 int err = super_types[mddev->major_version]
4238 .load_super(rdev, rdev0, mddev->minor_version);
4241 "md: %s has different UUID to %s\n",
4242 bdevname(rdev->bdev,b),
4243 bdevname(rdev0->bdev,b2));
4248 err = bind_rdev_to_array(rdev, mddev);
4255 * add_new_disk can be used once the array is assembled
4256 * to add "hot spares". They must already have a superblock
4261 if (!mddev->pers->hot_add_disk) {
4263 "%s: personality does not support diskops!\n",
4267 if (mddev->persistent)
4268 rdev = md_import_device(dev, mddev->major_version,
4269 mddev->minor_version);
4271 rdev = md_import_device(dev, -1, -1);
4274 "md: md_import_device returned %ld\n",
4276 return PTR_ERR(rdev);
4278 /* set save_raid_disk if appropriate */
4279 if (!mddev->persistent) {
4280 if (info->state & (1<<MD_DISK_SYNC) &&
4281 info->raid_disk < mddev->raid_disks)
4282 rdev->raid_disk = info->raid_disk;
4284 rdev->raid_disk = -1;
4286 super_types[mddev->major_version].
4287 validate_super(mddev, rdev);
4288 rdev->saved_raid_disk = rdev->raid_disk;
4290 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4291 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4292 set_bit(WriteMostly, &rdev->flags);
4294 rdev->raid_disk = -1;
4295 err = bind_rdev_to_array(rdev, mddev);
4296 if (!err && !mddev->pers->hot_remove_disk) {
4297 /* If there is hot_add_disk but no hot_remove_disk
4298 * then added disks for geometry changes,
4299 * and should be added immediately.
4301 super_types[mddev->major_version].
4302 validate_super(mddev, rdev);
4303 err = mddev->pers->hot_add_disk(mddev, rdev);
4305 unbind_rdev_from_array(rdev);
4310 sysfs_notify(&rdev->kobj, NULL, "state");
4312 md_update_sb(mddev, 1);
4313 if (mddev->degraded)
4314 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4315 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4316 md_wakeup_thread(mddev->thread);
4320 /* otherwise, add_new_disk is only allowed
4321 * for major_version==0 superblocks
4323 if (mddev->major_version != 0) {
4324 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4329 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4331 rdev = md_import_device (dev, -1, 0);
4334 "md: error, md_import_device() returned %ld\n",
4336 return PTR_ERR(rdev);
4338 rdev->desc_nr = info->number;
4339 if (info->raid_disk < mddev->raid_disks)
4340 rdev->raid_disk = info->raid_disk;
4342 rdev->raid_disk = -1;
4344 if (rdev->raid_disk < mddev->raid_disks)
4345 if (info->state & (1<<MD_DISK_SYNC))
4346 set_bit(In_sync, &rdev->flags);
4348 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4349 set_bit(WriteMostly, &rdev->flags);
4351 if (!mddev->persistent) {
4352 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4353 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4355 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4356 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4358 err = bind_rdev_to_array(rdev, mddev);
4368 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4370 char b[BDEVNAME_SIZE];
4373 rdev = find_rdev(mddev, dev);
4377 if (rdev->raid_disk >= 0)
4380 kick_rdev_from_array(rdev);
4381 md_update_sb(mddev, 1);
4382 md_new_event(mddev);
4386 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4387 bdevname(rdev->bdev,b), mdname(mddev));
4391 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4393 char b[BDEVNAME_SIZE];
4400 if (mddev->major_version != 0) {
4401 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4402 " version-0 superblocks.\n",
4406 if (!mddev->pers->hot_add_disk) {
4408 "%s: personality does not support diskops!\n",
4413 rdev = md_import_device (dev, -1, 0);
4416 "md: error, md_import_device() returned %ld\n",
4421 if (mddev->persistent)
4422 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4424 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4426 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4428 if (test_bit(Faulty, &rdev->flags)) {
4430 "md: can not hot-add faulty %s disk to %s!\n",
4431 bdevname(rdev->bdev,b), mdname(mddev));
4435 clear_bit(In_sync, &rdev->flags);
4437 rdev->saved_raid_disk = -1;
4438 err = bind_rdev_to_array(rdev, mddev);
4443 * The rest should better be atomic, we can have disk failures
4444 * noticed in interrupt contexts ...
4447 if (rdev->desc_nr == mddev->max_disks) {
4448 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4451 goto abort_unbind_export;
4454 rdev->raid_disk = -1;
4456 md_update_sb(mddev, 1);
4459 * Kick recovery, maybe this spare has to be added to the
4460 * array immediately.
4462 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4463 md_wakeup_thread(mddev->thread);
4464 md_new_event(mddev);
4467 abort_unbind_export:
4468 unbind_rdev_from_array(rdev);
4475 static int set_bitmap_file(mddev_t *mddev, int fd)
4480 if (!mddev->pers->quiesce)
4482 if (mddev->recovery || mddev->sync_thread)
4484 /* we should be able to change the bitmap.. */
4490 return -EEXIST; /* cannot add when bitmap is present */
4491 mddev->bitmap_file = fget(fd);
4493 if (mddev->bitmap_file == NULL) {
4494 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4499 err = deny_bitmap_write_access(mddev->bitmap_file);
4501 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4503 fput(mddev->bitmap_file);
4504 mddev->bitmap_file = NULL;
4507 mddev->bitmap_offset = 0; /* file overrides offset */
4508 } else if (mddev->bitmap == NULL)
4509 return -ENOENT; /* cannot remove what isn't there */
4512 mddev->pers->quiesce(mddev, 1);
4514 err = bitmap_create(mddev);
4515 if (fd < 0 || err) {
4516 bitmap_destroy(mddev);
4517 fd = -1; /* make sure to put the file */
4519 mddev->pers->quiesce(mddev, 0);
4522 if (mddev->bitmap_file) {
4523 restore_bitmap_write_access(mddev->bitmap_file);
4524 fput(mddev->bitmap_file);
4526 mddev->bitmap_file = NULL;
4533 * set_array_info is used two different ways
4534 * The original usage is when creating a new array.
4535 * In this usage, raid_disks is > 0 and it together with
4536 * level, size, not_persistent,layout,chunksize determine the
4537 * shape of the array.
4538 * This will always create an array with a type-0.90.0 superblock.
4539 * The newer usage is when assembling an array.
4540 * In this case raid_disks will be 0, and the major_version field is
4541 * use to determine which style super-blocks are to be found on the devices.
4542 * The minor and patch _version numbers are also kept incase the
4543 * super_block handler wishes to interpret them.
4545 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4548 if (info->raid_disks == 0) {
4549 /* just setting version number for superblock loading */
4550 if (info->major_version < 0 ||
4551 info->major_version >= ARRAY_SIZE(super_types) ||
4552 super_types[info->major_version].name == NULL) {
4553 /* maybe try to auto-load a module? */
4555 "md: superblock version %d not known\n",
4556 info->major_version);
4559 mddev->major_version = info->major_version;
4560 mddev->minor_version = info->minor_version;
4561 mddev->patch_version = info->patch_version;
4562 mddev->persistent = !info->not_persistent;
4565 mddev->major_version = MD_MAJOR_VERSION;
4566 mddev->minor_version = MD_MINOR_VERSION;
4567 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4568 mddev->ctime = get_seconds();
4570 mddev->level = info->level;
4571 mddev->clevel[0] = 0;
4572 mddev->size = info->size;
4573 mddev->raid_disks = info->raid_disks;
4574 /* don't set md_minor, it is determined by which /dev/md* was
4577 if (info->state & (1<<MD_SB_CLEAN))
4578 mddev->recovery_cp = MaxSector;
4580 mddev->recovery_cp = 0;
4581 mddev->persistent = ! info->not_persistent;
4582 mddev->external = 0;
4584 mddev->layout = info->layout;
4585 mddev->chunk_size = info->chunk_size;
4587 mddev->max_disks = MD_SB_DISKS;
4589 if (mddev->persistent)
4591 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4593 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4594 mddev->bitmap_offset = 0;
4596 mddev->reshape_position = MaxSector;
4599 * Generate a 128 bit UUID
4601 get_random_bytes(mddev->uuid, 16);
4603 mddev->new_level = mddev->level;
4604 mddev->new_chunk = mddev->chunk_size;
4605 mddev->new_layout = mddev->layout;
4606 mddev->delta_disks = 0;
4611 static int update_size(mddev_t *mddev, sector_t num_sectors)
4615 struct list_head *tmp;
4616 int fit = (num_sectors == 0);
4618 if (mddev->pers->resize == NULL)
4620 /* The "num_sectors" is the number of sectors of each device that
4621 * is used. This can only make sense for arrays with redundancy.
4622 * linear and raid0 always use whatever space is available. We can only
4623 * consider changing this number if no resync or reconstruction is
4624 * happening, and if the new size is acceptable. It must fit before the
4625 * sb_start or, if that is <data_offset, it must fit before the size
4626 * of each device. If num_sectors is zero, we find the largest size
4630 if (mddev->sync_thread)
4632 rdev_for_each(rdev, tmp, mddev) {
4634 avail = rdev->size * 2;
4636 if (fit && (num_sectors == 0 || num_sectors > avail))
4637 num_sectors = avail;
4638 if (avail < num_sectors)
4641 rv = mddev->pers->resize(mddev, num_sectors);
4643 struct block_device *bdev;
4645 bdev = bdget_disk(mddev->gendisk, 0);
4647 mutex_lock(&bdev->bd_inode->i_mutex);
4648 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
4649 mutex_unlock(&bdev->bd_inode->i_mutex);
4656 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4659 /* change the number of raid disks */
4660 if (mddev->pers->check_reshape == NULL)
4662 if (raid_disks <= 0 ||
4663 raid_disks >= mddev->max_disks)
4665 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4667 mddev->delta_disks = raid_disks - mddev->raid_disks;
4669 rv = mddev->pers->check_reshape(mddev);
4675 * update_array_info is used to change the configuration of an
4677 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4678 * fields in the info are checked against the array.
4679 * Any differences that cannot be handled will cause an error.
4680 * Normally, only one change can be managed at a time.
4682 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4688 /* calculate expected state,ignoring low bits */
4689 if (mddev->bitmap && mddev->bitmap_offset)
4690 state |= (1 << MD_SB_BITMAP_PRESENT);
4692 if (mddev->major_version != info->major_version ||
4693 mddev->minor_version != info->minor_version ||
4694 /* mddev->patch_version != info->patch_version || */
4695 mddev->ctime != info->ctime ||
4696 mddev->level != info->level ||
4697 /* mddev->layout != info->layout || */
4698 !mddev->persistent != info->not_persistent||
4699 mddev->chunk_size != info->chunk_size ||
4700 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4701 ((state^info->state) & 0xfffffe00)
4704 /* Check there is only one change */
4705 if (info->size >= 0 && mddev->size != info->size) cnt++;
4706 if (mddev->raid_disks != info->raid_disks) cnt++;
4707 if (mddev->layout != info->layout) cnt++;
4708 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4709 if (cnt == 0) return 0;
4710 if (cnt > 1) return -EINVAL;
4712 if (mddev->layout != info->layout) {
4714 * we don't need to do anything at the md level, the
4715 * personality will take care of it all.
4717 if (mddev->pers->reconfig == NULL)
4720 return mddev->pers->reconfig(mddev, info->layout, -1);
4722 if (info->size >= 0 && mddev->size != info->size)
4723 rv = update_size(mddev, (sector_t)info->size * 2);
4725 if (mddev->raid_disks != info->raid_disks)
4726 rv = update_raid_disks(mddev, info->raid_disks);
4728 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4729 if (mddev->pers->quiesce == NULL)
4731 if (mddev->recovery || mddev->sync_thread)
4733 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4734 /* add the bitmap */
4737 if (mddev->default_bitmap_offset == 0)
4739 mddev->bitmap_offset = mddev->default_bitmap_offset;
4740 mddev->pers->quiesce(mddev, 1);
4741 rv = bitmap_create(mddev);
4743 bitmap_destroy(mddev);
4744 mddev->pers->quiesce(mddev, 0);
4746 /* remove the bitmap */
4749 if (mddev->bitmap->file)
4751 mddev->pers->quiesce(mddev, 1);
4752 bitmap_destroy(mddev);
4753 mddev->pers->quiesce(mddev, 0);
4754 mddev->bitmap_offset = 0;
4757 md_update_sb(mddev, 1);
4761 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4765 if (mddev->pers == NULL)
4768 rdev = find_rdev(mddev, dev);
4772 md_error(mddev, rdev);
4777 * We have a problem here : there is no easy way to give a CHS
4778 * virtual geometry. We currently pretend that we have a 2 heads
4779 * 4 sectors (with a BIG number of cylinders...). This drives
4780 * dosfs just mad... ;-)
4782 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4784 mddev_t *mddev = bdev->bd_disk->private_data;
4788 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4792 static int md_ioctl(struct inode *inode, struct file *file,
4793 unsigned int cmd, unsigned long arg)
4796 void __user *argp = (void __user *)arg;
4797 mddev_t *mddev = NULL;
4799 if (!capable(CAP_SYS_ADMIN))
4803 * Commands dealing with the RAID driver but not any
4809 err = get_version(argp);
4812 case PRINT_RAID_DEBUG:
4820 autostart_arrays(arg);
4827 * Commands creating/starting a new array:
4830 mddev = inode->i_bdev->bd_disk->private_data;
4837 err = mddev_lock(mddev);
4840 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4847 case SET_ARRAY_INFO:
4849 mdu_array_info_t info;
4851 memset(&info, 0, sizeof(info));
4852 else if (copy_from_user(&info, argp, sizeof(info))) {
4857 err = update_array_info(mddev, &info);
4859 printk(KERN_WARNING "md: couldn't update"
4860 " array info. %d\n", err);
4865 if (!list_empty(&mddev->disks)) {
4867 "md: array %s already has disks!\n",
4872 if (mddev->raid_disks) {
4874 "md: array %s already initialised!\n",
4879 err = set_array_info(mddev, &info);
4881 printk(KERN_WARNING "md: couldn't set"
4882 " array info. %d\n", err);
4892 * Commands querying/configuring an existing array:
4894 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4895 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4896 if ((!mddev->raid_disks && !mddev->external)
4897 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4898 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4899 && cmd != GET_BITMAP_FILE) {
4905 * Commands even a read-only array can execute:
4909 case GET_ARRAY_INFO:
4910 err = get_array_info(mddev, argp);
4913 case GET_BITMAP_FILE:
4914 err = get_bitmap_file(mddev, argp);
4918 err = get_disk_info(mddev, argp);
4921 case RESTART_ARRAY_RW:
4922 err = restart_array(mddev);
4926 err = do_md_stop (mddev, 0, 1);
4930 err = do_md_stop (mddev, 1, 1);
4936 * The remaining ioctls are changing the state of the
4937 * superblock, so we do not allow them on read-only arrays.
4938 * However non-MD ioctls (e.g. get-size) will still come through
4939 * here and hit the 'default' below, so only disallow
4940 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4942 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
4943 if (mddev->ro == 2) {
4945 sysfs_notify(&mddev->kobj, NULL, "array_state");
4946 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4947 md_wakeup_thread(mddev->thread);
4958 mdu_disk_info_t info;
4959 if (copy_from_user(&info, argp, sizeof(info)))
4962 err = add_new_disk(mddev, &info);
4966 case HOT_REMOVE_DISK:
4967 err = hot_remove_disk(mddev, new_decode_dev(arg));
4971 err = hot_add_disk(mddev, new_decode_dev(arg));
4974 case SET_DISK_FAULTY:
4975 err = set_disk_faulty(mddev, new_decode_dev(arg));
4979 err = do_md_run (mddev);
4982 case SET_BITMAP_FILE:
4983 err = set_bitmap_file(mddev, (int)arg);
4993 mddev_unlock(mddev);
5003 static int md_open(struct inode *inode, struct file *file)
5006 * Succeed if we can lock the mddev, which confirms that
5007 * it isn't being stopped right now.
5009 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
5012 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5017 mddev_unlock(mddev);
5019 check_disk_change(inode->i_bdev);
5024 static int md_release(struct inode *inode, struct file * file)
5026 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
5034 static int md_media_changed(struct gendisk *disk)
5036 mddev_t *mddev = disk->private_data;
5038 return mddev->changed;
5041 static int md_revalidate(struct gendisk *disk)
5043 mddev_t *mddev = disk->private_data;
5048 static struct block_device_operations md_fops =
5050 .owner = THIS_MODULE,
5052 .release = md_release,
5054 .getgeo = md_getgeo,
5055 .media_changed = md_media_changed,
5056 .revalidate_disk= md_revalidate,
5059 static int md_thread(void * arg)
5061 mdk_thread_t *thread = arg;
5064 * md_thread is a 'system-thread', it's priority should be very
5065 * high. We avoid resource deadlocks individually in each
5066 * raid personality. (RAID5 does preallocation) We also use RR and
5067 * the very same RT priority as kswapd, thus we will never get
5068 * into a priority inversion deadlock.
5070 * we definitely have to have equal or higher priority than
5071 * bdflush, otherwise bdflush will deadlock if there are too
5072 * many dirty RAID5 blocks.
5075 allow_signal(SIGKILL);
5076 while (!kthread_should_stop()) {
5078 /* We need to wait INTERRUPTIBLE so that
5079 * we don't add to the load-average.
5080 * That means we need to be sure no signals are
5083 if (signal_pending(current))
5084 flush_signals(current);
5086 wait_event_interruptible_timeout
5088 test_bit(THREAD_WAKEUP, &thread->flags)
5089 || kthread_should_stop(),
5092 clear_bit(THREAD_WAKEUP, &thread->flags);
5094 thread->run(thread->mddev);
5100 void md_wakeup_thread(mdk_thread_t *thread)
5103 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5104 set_bit(THREAD_WAKEUP, &thread->flags);
5105 wake_up(&thread->wqueue);
5109 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5112 mdk_thread_t *thread;
5114 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5118 init_waitqueue_head(&thread->wqueue);
5121 thread->mddev = mddev;
5122 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5123 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5124 if (IS_ERR(thread->tsk)) {
5131 void md_unregister_thread(mdk_thread_t *thread)
5133 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5135 kthread_stop(thread->tsk);
5139 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5146 if (!rdev || test_bit(Faulty, &rdev->flags))
5149 if (mddev->external)
5150 set_bit(Blocked, &rdev->flags);
5152 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5154 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5155 __builtin_return_address(0),__builtin_return_address(1),
5156 __builtin_return_address(2),__builtin_return_address(3));
5160 if (!mddev->pers->error_handler)
5162 mddev->pers->error_handler(mddev,rdev);
5163 if (mddev->degraded)
5164 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5165 set_bit(StateChanged, &rdev->flags);
5166 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5167 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5168 md_wakeup_thread(mddev->thread);
5169 md_new_event_inintr(mddev);
5172 /* seq_file implementation /proc/mdstat */
5174 static void status_unused(struct seq_file *seq)
5178 struct list_head *tmp;
5180 seq_printf(seq, "unused devices: ");
5182 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
5183 char b[BDEVNAME_SIZE];
5185 seq_printf(seq, "%s ",
5186 bdevname(rdev->bdev,b));
5189 seq_printf(seq, "<none>");
5191 seq_printf(seq, "\n");
5195 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5197 sector_t max_blocks, resync, res;
5198 unsigned long dt, db, rt;
5200 unsigned int per_milli;
5202 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5204 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5205 max_blocks = mddev->resync_max_sectors >> 1;
5207 max_blocks = mddev->size;
5210 * Should not happen.
5216 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5217 * in a sector_t, and (max_blocks>>scale) will fit in a
5218 * u32, as those are the requirements for sector_div.
5219 * Thus 'scale' must be at least 10
5222 if (sizeof(sector_t) > sizeof(unsigned long)) {
5223 while ( max_blocks/2 > (1ULL<<(scale+32)))
5226 res = (resync>>scale)*1000;
5227 sector_div(res, (u32)((max_blocks>>scale)+1));
5231 int i, x = per_milli/50, y = 20-x;
5232 seq_printf(seq, "[");
5233 for (i = 0; i < x; i++)
5234 seq_printf(seq, "=");
5235 seq_printf(seq, ">");
5236 for (i = 0; i < y; i++)
5237 seq_printf(seq, ".");
5238 seq_printf(seq, "] ");
5240 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5241 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5243 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5245 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5246 "resync" : "recovery"))),
5247 per_milli/10, per_milli % 10,
5248 (unsigned long long) resync,
5249 (unsigned long long) max_blocks);
5252 * We do not want to overflow, so the order of operands and
5253 * the * 100 / 100 trick are important. We do a +1 to be
5254 * safe against division by zero. We only estimate anyway.
5256 * dt: time from mark until now
5257 * db: blocks written from mark until now
5258 * rt: remaining time
5260 dt = ((jiffies - mddev->resync_mark) / HZ);
5262 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5263 - mddev->resync_mark_cnt;
5264 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5266 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5268 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5271 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5273 struct list_head *tmp;
5283 spin_lock(&all_mddevs_lock);
5284 list_for_each(tmp,&all_mddevs)
5286 mddev = list_entry(tmp, mddev_t, all_mddevs);
5288 spin_unlock(&all_mddevs_lock);
5291 spin_unlock(&all_mddevs_lock);
5293 return (void*)2;/* tail */
5297 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5299 struct list_head *tmp;
5300 mddev_t *next_mddev, *mddev = v;
5306 spin_lock(&all_mddevs_lock);
5308 tmp = all_mddevs.next;
5310 tmp = mddev->all_mddevs.next;
5311 if (tmp != &all_mddevs)
5312 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5314 next_mddev = (void*)2;
5317 spin_unlock(&all_mddevs_lock);
5325 static void md_seq_stop(struct seq_file *seq, void *v)
5329 if (mddev && v != (void*)1 && v != (void*)2)
5333 struct mdstat_info {
5337 static int md_seq_show(struct seq_file *seq, void *v)
5341 struct list_head *tmp2;
5343 struct mdstat_info *mi = seq->private;
5344 struct bitmap *bitmap;
5346 if (v == (void*)1) {
5347 struct mdk_personality *pers;
5348 seq_printf(seq, "Personalities : ");
5349 spin_lock(&pers_lock);
5350 list_for_each_entry(pers, &pers_list, list)
5351 seq_printf(seq, "[%s] ", pers->name);
5353 spin_unlock(&pers_lock);
5354 seq_printf(seq, "\n");
5355 mi->event = atomic_read(&md_event_count);
5358 if (v == (void*)2) {
5363 if (mddev_lock(mddev) < 0)
5366 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5367 seq_printf(seq, "%s : %sactive", mdname(mddev),
5368 mddev->pers ? "" : "in");
5371 seq_printf(seq, " (read-only)");
5373 seq_printf(seq, " (auto-read-only)");
5374 seq_printf(seq, " %s", mddev->pers->name);
5378 rdev_for_each(rdev, tmp2, mddev) {
5379 char b[BDEVNAME_SIZE];
5380 seq_printf(seq, " %s[%d]",
5381 bdevname(rdev->bdev,b), rdev->desc_nr);
5382 if (test_bit(WriteMostly, &rdev->flags))
5383 seq_printf(seq, "(W)");
5384 if (test_bit(Faulty, &rdev->flags)) {
5385 seq_printf(seq, "(F)");
5387 } else if (rdev->raid_disk < 0)
5388 seq_printf(seq, "(S)"); /* spare */
5392 if (!list_empty(&mddev->disks)) {
5394 seq_printf(seq, "\n %llu blocks",
5395 (unsigned long long)mddev->array_size);
5397 seq_printf(seq, "\n %llu blocks",
5398 (unsigned long long)size);
5400 if (mddev->persistent) {
5401 if (mddev->major_version != 0 ||
5402 mddev->minor_version != 90) {
5403 seq_printf(seq," super %d.%d",
5404 mddev->major_version,
5405 mddev->minor_version);
5407 } else if (mddev->external)
5408 seq_printf(seq, " super external:%s",
5409 mddev->metadata_type);
5411 seq_printf(seq, " super non-persistent");
5414 mddev->pers->status (seq, mddev);
5415 seq_printf(seq, "\n ");
5416 if (mddev->pers->sync_request) {
5417 if (mddev->curr_resync > 2) {
5418 status_resync (seq, mddev);
5419 seq_printf(seq, "\n ");
5420 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5421 seq_printf(seq, "\tresync=DELAYED\n ");
5422 else if (mddev->recovery_cp < MaxSector)
5423 seq_printf(seq, "\tresync=PENDING\n ");
5426 seq_printf(seq, "\n ");
5428 if ((bitmap = mddev->bitmap)) {
5429 unsigned long chunk_kb;
5430 unsigned long flags;
5431 spin_lock_irqsave(&bitmap->lock, flags);
5432 chunk_kb = bitmap->chunksize >> 10;
5433 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5435 bitmap->pages - bitmap->missing_pages,
5437 (bitmap->pages - bitmap->missing_pages)
5438 << (PAGE_SHIFT - 10),
5439 chunk_kb ? chunk_kb : bitmap->chunksize,
5440 chunk_kb ? "KB" : "B");
5442 seq_printf(seq, ", file: ");
5443 seq_path(seq, &bitmap->file->f_path, " \t\n");
5446 seq_printf(seq, "\n");
5447 spin_unlock_irqrestore(&bitmap->lock, flags);
5450 seq_printf(seq, "\n");
5452 mddev_unlock(mddev);
5457 static struct seq_operations md_seq_ops = {
5458 .start = md_seq_start,
5459 .next = md_seq_next,
5460 .stop = md_seq_stop,
5461 .show = md_seq_show,
5464 static int md_seq_open(struct inode *inode, struct file *file)
5467 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5471 error = seq_open(file, &md_seq_ops);
5475 struct seq_file *p = file->private_data;
5477 mi->event = atomic_read(&md_event_count);
5482 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5484 struct seq_file *m = filp->private_data;
5485 struct mdstat_info *mi = m->private;
5488 poll_wait(filp, &md_event_waiters, wait);
5490 /* always allow read */
5491 mask = POLLIN | POLLRDNORM;
5493 if (mi->event != atomic_read(&md_event_count))
5494 mask |= POLLERR | POLLPRI;
5498 static const struct file_operations md_seq_fops = {
5499 .owner = THIS_MODULE,
5500 .open = md_seq_open,
5502 .llseek = seq_lseek,
5503 .release = seq_release_private,
5504 .poll = mdstat_poll,
5507 int register_md_personality(struct mdk_personality *p)
5509 spin_lock(&pers_lock);
5510 list_add_tail(&p->list, &pers_list);
5511 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5512 spin_unlock(&pers_lock);
5516 int unregister_md_personality(struct mdk_personality *p)
5518 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5519 spin_lock(&pers_lock);
5520 list_del_init(&p->list);
5521 spin_unlock(&pers_lock);
5525 static int is_mddev_idle(mddev_t *mddev)
5528 struct list_head *tmp;
5533 rdev_for_each(rdev, tmp, mddev) {
5534 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5535 curr_events = disk_stat_read(disk, sectors[0]) +
5536 disk_stat_read(disk, sectors[1]) -
5537 atomic_read(&disk->sync_io);
5538 /* sync IO will cause sync_io to increase before the disk_stats
5539 * as sync_io is counted when a request starts, and
5540 * disk_stats is counted when it completes.
5541 * So resync activity will cause curr_events to be smaller than
5542 * when there was no such activity.
5543 * non-sync IO will cause disk_stat to increase without
5544 * increasing sync_io so curr_events will (eventually)
5545 * be larger than it was before. Once it becomes
5546 * substantially larger, the test below will cause
5547 * the array to appear non-idle, and resync will slow
5549 * If there is a lot of outstanding resync activity when
5550 * we set last_event to curr_events, then all that activity
5551 * completing might cause the array to appear non-idle
5552 * and resync will be slowed down even though there might
5553 * not have been non-resync activity. This will only
5554 * happen once though. 'last_events' will soon reflect
5555 * the state where there is little or no outstanding
5556 * resync requests, and further resync activity will
5557 * always make curr_events less than last_events.
5560 if (curr_events - rdev->last_events > 4096) {
5561 rdev->last_events = curr_events;
5568 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5570 /* another "blocks" (512byte) blocks have been synced */
5571 atomic_sub(blocks, &mddev->recovery_active);
5572 wake_up(&mddev->recovery_wait);
5574 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5575 md_wakeup_thread(mddev->thread);
5576 // stop recovery, signal do_sync ....
5581 /* md_write_start(mddev, bi)
5582 * If we need to update some array metadata (e.g. 'active' flag
5583 * in superblock) before writing, schedule a superblock update
5584 * and wait for it to complete.
5586 void md_write_start(mddev_t *mddev, struct bio *bi)
5589 if (bio_data_dir(bi) != WRITE)
5592 BUG_ON(mddev->ro == 1);
5593 if (mddev->ro == 2) {
5594 /* need to switch to read/write */
5596 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5597 md_wakeup_thread(mddev->thread);
5598 md_wakeup_thread(mddev->sync_thread);
5601 atomic_inc(&mddev->writes_pending);
5602 if (mddev->safemode == 1)
5603 mddev->safemode = 0;
5604 if (mddev->in_sync) {
5605 spin_lock_irq(&mddev->write_lock);
5606 if (mddev->in_sync) {
5608 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5609 md_wakeup_thread(mddev->thread);
5612 spin_unlock_irq(&mddev->write_lock);
5615 sysfs_notify(&mddev->kobj, NULL, "array_state");
5616 wait_event(mddev->sb_wait,
5617 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5618 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5621 void md_write_end(mddev_t *mddev)
5623 if (atomic_dec_and_test(&mddev->writes_pending)) {
5624 if (mddev->safemode == 2)
5625 md_wakeup_thread(mddev->thread);
5626 else if (mddev->safemode_delay)
5627 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5631 /* md_allow_write(mddev)
5632 * Calling this ensures that the array is marked 'active' so that writes
5633 * may proceed without blocking. It is important to call this before
5634 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5635 * Must be called with mddev_lock held.
5637 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5638 * is dropped, so return -EAGAIN after notifying userspace.
5640 int md_allow_write(mddev_t *mddev)
5646 if (!mddev->pers->sync_request)
5649 spin_lock_irq(&mddev->write_lock);
5650 if (mddev->in_sync) {
5652 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5653 if (mddev->safemode_delay &&
5654 mddev->safemode == 0)
5655 mddev->safemode = 1;
5656 spin_unlock_irq(&mddev->write_lock);
5657 md_update_sb(mddev, 0);
5658 sysfs_notify(&mddev->kobj, NULL, "array_state");
5660 spin_unlock_irq(&mddev->write_lock);
5662 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
5667 EXPORT_SYMBOL_GPL(md_allow_write);
5669 #define SYNC_MARKS 10
5670 #define SYNC_MARK_STEP (3*HZ)
5671 void md_do_sync(mddev_t *mddev)
5674 unsigned int currspeed = 0,
5676 sector_t max_sectors,j, io_sectors;
5677 unsigned long mark[SYNC_MARKS];
5678 sector_t mark_cnt[SYNC_MARKS];
5680 struct list_head *tmp;
5681 sector_t last_check;
5683 struct list_head *rtmp;
5687 /* just incase thread restarts... */
5688 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5690 if (mddev->ro) /* never try to sync a read-only array */
5693 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5694 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5695 desc = "data-check";
5696 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5697 desc = "requested-resync";
5700 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5705 /* we overload curr_resync somewhat here.
5706 * 0 == not engaged in resync at all
5707 * 2 == checking that there is no conflict with another sync
5708 * 1 == like 2, but have yielded to allow conflicting resync to
5710 * other == active in resync - this many blocks
5712 * Before starting a resync we must have set curr_resync to
5713 * 2, and then checked that every "conflicting" array has curr_resync
5714 * less than ours. When we find one that is the same or higher
5715 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5716 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5717 * This will mean we have to start checking from the beginning again.
5722 mddev->curr_resync = 2;
5725 if (kthread_should_stop()) {
5726 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5729 for_each_mddev(mddev2, tmp) {
5730 if (mddev2 == mddev)
5732 if (!mddev->parallel_resync
5733 && mddev2->curr_resync
5734 && match_mddev_units(mddev, mddev2)) {
5736 if (mddev < mddev2 && mddev->curr_resync == 2) {
5737 /* arbitrarily yield */
5738 mddev->curr_resync = 1;
5739 wake_up(&resync_wait);
5741 if (mddev > mddev2 && mddev->curr_resync == 1)
5742 /* no need to wait here, we can wait the next
5743 * time 'round when curr_resync == 2
5746 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5747 if (!kthread_should_stop() &&
5748 mddev2->curr_resync >= mddev->curr_resync) {
5749 printk(KERN_INFO "md: delaying %s of %s"
5750 " until %s has finished (they"
5751 " share one or more physical units)\n",
5752 desc, mdname(mddev), mdname(mddev2));
5755 finish_wait(&resync_wait, &wq);
5758 finish_wait(&resync_wait, &wq);
5761 } while (mddev->curr_resync < 2);
5764 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5765 /* resync follows the size requested by the personality,
5766 * which defaults to physical size, but can be virtual size
5768 max_sectors = mddev->resync_max_sectors;
5769 mddev->resync_mismatches = 0;
5770 /* we don't use the checkpoint if there's a bitmap */
5771 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5772 j = mddev->resync_min;
5773 else if (!mddev->bitmap)
5774 j = mddev->recovery_cp;
5776 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5777 max_sectors = mddev->size << 1;
5779 /* recovery follows the physical size of devices */
5780 max_sectors = mddev->size << 1;
5782 rdev_for_each(rdev, rtmp, mddev)
5783 if (rdev->raid_disk >= 0 &&
5784 !test_bit(Faulty, &rdev->flags) &&
5785 !test_bit(In_sync, &rdev->flags) &&
5786 rdev->recovery_offset < j)
5787 j = rdev->recovery_offset;
5790 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5791 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5792 " %d KB/sec/disk.\n", speed_min(mddev));
5793 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5794 "(but not more than %d KB/sec) for %s.\n",
5795 speed_max(mddev), desc);
5797 is_mddev_idle(mddev); /* this also initializes IO event counters */
5800 for (m = 0; m < SYNC_MARKS; m++) {
5802 mark_cnt[m] = io_sectors;
5805 mddev->resync_mark = mark[last_mark];
5806 mddev->resync_mark_cnt = mark_cnt[last_mark];
5809 * Tune reconstruction:
5811 window = 32*(PAGE_SIZE/512);
5812 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5813 window/2,(unsigned long long) max_sectors/2);
5815 atomic_set(&mddev->recovery_active, 0);
5820 "md: resuming %s of %s from checkpoint.\n",
5821 desc, mdname(mddev));
5822 mddev->curr_resync = j;
5825 while (j < max_sectors) {
5829 if (j >= mddev->resync_max) {
5830 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5831 wait_event(mddev->recovery_wait,
5832 mddev->resync_max > j
5833 || kthread_should_stop());
5835 if (kthread_should_stop())
5837 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5838 currspeed < speed_min(mddev));
5840 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5844 if (!skipped) { /* actual IO requested */
5845 io_sectors += sectors;
5846 atomic_add(sectors, &mddev->recovery_active);
5850 if (j>1) mddev->curr_resync = j;
5851 mddev->curr_mark_cnt = io_sectors;
5852 if (last_check == 0)
5853 /* this is the earliers that rebuilt will be
5854 * visible in /proc/mdstat
5856 md_new_event(mddev);
5858 if (last_check + window > io_sectors || j == max_sectors)
5861 last_check = io_sectors;
5863 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5867 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5869 int next = (last_mark+1) % SYNC_MARKS;
5871 mddev->resync_mark = mark[next];
5872 mddev->resync_mark_cnt = mark_cnt[next];
5873 mark[next] = jiffies;
5874 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5879 if (kthread_should_stop())
5884 * this loop exits only if either when we are slower than
5885 * the 'hard' speed limit, or the system was IO-idle for
5887 * the system might be non-idle CPU-wise, but we only care
5888 * about not overloading the IO subsystem. (things like an
5889 * e2fsck being done on the RAID array should execute fast)
5891 blk_unplug(mddev->queue);
5894 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5895 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5897 if (currspeed > speed_min(mddev)) {
5898 if ((currspeed > speed_max(mddev)) ||
5899 !is_mddev_idle(mddev)) {
5905 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5907 * this also signals 'finished resyncing' to md_stop
5910 blk_unplug(mddev->queue);
5912 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5914 /* tell personality that we are finished */
5915 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5917 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5918 mddev->curr_resync > 2) {
5919 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5920 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5921 if (mddev->curr_resync >= mddev->recovery_cp) {
5923 "md: checkpointing %s of %s.\n",
5924 desc, mdname(mddev));
5925 mddev->recovery_cp = mddev->curr_resync;
5928 mddev->recovery_cp = MaxSector;
5930 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5931 mddev->curr_resync = MaxSector;
5932 rdev_for_each(rdev, rtmp, mddev)
5933 if (rdev->raid_disk >= 0 &&
5934 !test_bit(Faulty, &rdev->flags) &&
5935 !test_bit(In_sync, &rdev->flags) &&
5936 rdev->recovery_offset < mddev->curr_resync)
5937 rdev->recovery_offset = mddev->curr_resync;
5940 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5943 mddev->curr_resync = 0;
5944 mddev->resync_min = 0;
5945 mddev->resync_max = MaxSector;
5946 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5947 wake_up(&resync_wait);
5948 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5949 md_wakeup_thread(mddev->thread);
5954 * got a signal, exit.
5957 "md: md_do_sync() got signal ... exiting\n");
5958 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5962 EXPORT_SYMBOL_GPL(md_do_sync);
5965 static int remove_and_add_spares(mddev_t *mddev)
5968 struct list_head *rtmp;
5971 rdev_for_each(rdev, rtmp, mddev)
5972 if (rdev->raid_disk >= 0 &&
5973 !test_bit(Blocked, &rdev->flags) &&
5974 (test_bit(Faulty, &rdev->flags) ||
5975 ! test_bit(In_sync, &rdev->flags)) &&
5976 atomic_read(&rdev->nr_pending)==0) {
5977 if (mddev->pers->hot_remove_disk(
5978 mddev, rdev->raid_disk)==0) {
5980 sprintf(nm,"rd%d", rdev->raid_disk);
5981 sysfs_remove_link(&mddev->kobj, nm);
5982 rdev->raid_disk = -1;
5986 if (mddev->degraded) {
5987 rdev_for_each(rdev, rtmp, mddev) {
5988 if (rdev->raid_disk >= 0 &&
5989 !test_bit(In_sync, &rdev->flags))
5991 if (rdev->raid_disk < 0
5992 && !test_bit(Faulty, &rdev->flags)) {
5993 rdev->recovery_offset = 0;
5995 hot_add_disk(mddev, rdev) == 0) {
5997 sprintf(nm, "rd%d", rdev->raid_disk);
5998 if (sysfs_create_link(&mddev->kobj,
6001 "md: cannot register "
6005 md_new_event(mddev);
6014 * This routine is regularly called by all per-raid-array threads to
6015 * deal with generic issues like resync and super-block update.
6016 * Raid personalities that don't have a thread (linear/raid0) do not
6017 * need this as they never do any recovery or update the superblock.
6019 * It does not do any resync itself, but rather "forks" off other threads
6020 * to do that as needed.
6021 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6022 * "->recovery" and create a thread at ->sync_thread.
6023 * When the thread finishes it sets MD_RECOVERY_DONE
6024 * and wakeups up this thread which will reap the thread and finish up.
6025 * This thread also removes any faulty devices (with nr_pending == 0).
6027 * The overall approach is:
6028 * 1/ if the superblock needs updating, update it.
6029 * 2/ If a recovery thread is running, don't do anything else.
6030 * 3/ If recovery has finished, clean up, possibly marking spares active.
6031 * 4/ If there are any faulty devices, remove them.
6032 * 5/ If array is degraded, try to add spares devices
6033 * 6/ If array has spares or is not in-sync, start a resync thread.
6035 void md_check_recovery(mddev_t *mddev)
6038 struct list_head *rtmp;
6042 bitmap_daemon_work(mddev->bitmap);
6047 if (signal_pending(current)) {
6048 if (mddev->pers->sync_request && !mddev->external) {
6049 printk(KERN_INFO "md: %s in immediate safe mode\n",
6051 mddev->safemode = 2;
6053 flush_signals(current);
6057 (mddev->flags && !mddev->external) ||
6058 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6059 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6060 (mddev->external == 0 && mddev->safemode == 1) ||
6061 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6062 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6066 if (mddev_trylock(mddev)) {
6069 if (!mddev->external) {
6071 spin_lock_irq(&mddev->write_lock);
6072 if (mddev->safemode &&
6073 !atomic_read(&mddev->writes_pending) &&
6075 mddev->recovery_cp == MaxSector) {
6078 if (mddev->persistent)
6079 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6081 if (mddev->safemode == 1)
6082 mddev->safemode = 0;
6083 spin_unlock_irq(&mddev->write_lock);
6085 sysfs_notify(&mddev->kobj, NULL, "array_state");
6089 md_update_sb(mddev, 0);
6091 rdev_for_each(rdev, rtmp, mddev)
6092 if (test_and_clear_bit(StateChanged, &rdev->flags))
6093 sysfs_notify(&rdev->kobj, NULL, "state");
6096 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6097 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6098 /* resync/recovery still happening */
6099 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6102 if (mddev->sync_thread) {
6103 /* resync has finished, collect result */
6104 md_unregister_thread(mddev->sync_thread);
6105 mddev->sync_thread = NULL;
6106 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6108 /* activate any spares */
6109 if (mddev->pers->spare_active(mddev))
6110 sysfs_notify(&mddev->kobj, NULL,
6113 md_update_sb(mddev, 1);
6115 /* if array is no-longer degraded, then any saved_raid_disk
6116 * information must be scrapped
6118 if (!mddev->degraded)
6119 rdev_for_each(rdev, rtmp, mddev)
6120 rdev->saved_raid_disk = -1;
6122 mddev->recovery = 0;
6123 /* flag recovery needed just to double check */
6124 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6125 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6126 md_new_event(mddev);
6129 /* Set RUNNING before clearing NEEDED to avoid
6130 * any transients in the value of "sync_action".
6132 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6133 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6134 /* Clear some bits that don't mean anything, but
6137 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6138 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6140 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6142 /* no recovery is running.
6143 * remove any failed drives, then
6144 * add spares if possible.
6145 * Spare are also removed and re-added, to allow
6146 * the personality to fail the re-add.
6149 if (mddev->reshape_position != MaxSector) {
6150 if (mddev->pers->check_reshape(mddev) != 0)
6151 /* Cannot proceed */
6153 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6154 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6155 } else if ((spares = remove_and_add_spares(mddev))) {
6156 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6157 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6158 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6159 } else if (mddev->recovery_cp < MaxSector) {
6160 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6161 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6162 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6163 /* nothing to be done ... */
6166 if (mddev->pers->sync_request) {
6167 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6168 /* We are adding a device or devices to an array
6169 * which has the bitmap stored on all devices.
6170 * So make sure all bitmap pages get written
6172 bitmap_write_all(mddev->bitmap);
6174 mddev->sync_thread = md_register_thread(md_do_sync,
6177 if (!mddev->sync_thread) {
6178 printk(KERN_ERR "%s: could not start resync"
6181 /* leave the spares where they are, it shouldn't hurt */
6182 mddev->recovery = 0;
6184 md_wakeup_thread(mddev->sync_thread);
6185 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6186 md_new_event(mddev);
6189 if (!mddev->sync_thread) {
6190 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6191 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6193 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6195 mddev_unlock(mddev);
6199 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6201 sysfs_notify(&rdev->kobj, NULL, "state");
6202 wait_event_timeout(rdev->blocked_wait,
6203 !test_bit(Blocked, &rdev->flags),
6204 msecs_to_jiffies(5000));
6205 rdev_dec_pending(rdev, mddev);
6207 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6209 static int md_notify_reboot(struct notifier_block *this,
6210 unsigned long code, void *x)
6212 struct list_head *tmp;
6215 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6217 printk(KERN_INFO "md: stopping all md devices.\n");
6219 for_each_mddev(mddev, tmp)
6220 if (mddev_trylock(mddev)) {
6221 do_md_stop (mddev, 1, 0);
6222 mddev_unlock(mddev);
6225 * certain more exotic SCSI devices are known to be
6226 * volatile wrt too early system reboots. While the
6227 * right place to handle this issue is the given
6228 * driver, we do want to have a safe RAID driver ...
6235 static struct notifier_block md_notifier = {
6236 .notifier_call = md_notify_reboot,
6238 .priority = INT_MAX, /* before any real devices */
6241 static void md_geninit(void)
6243 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6245 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6248 static int __init md_init(void)
6250 if (register_blkdev(MAJOR_NR, "md"))
6252 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6253 unregister_blkdev(MAJOR_NR, "md");
6256 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6257 md_probe, NULL, NULL);
6258 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6259 md_probe, NULL, NULL);
6261 register_reboot_notifier(&md_notifier);
6262 raid_table_header = register_sysctl_table(raid_root_table);
6272 * Searches all registered partitions for autorun RAID arrays
6276 static LIST_HEAD(all_detected_devices);
6277 struct detected_devices_node {
6278 struct list_head list;
6282 void md_autodetect_dev(dev_t dev)
6284 struct detected_devices_node *node_detected_dev;
6286 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6287 if (node_detected_dev) {
6288 node_detected_dev->dev = dev;
6289 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6291 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6292 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6297 static void autostart_arrays(int part)
6300 struct detected_devices_node *node_detected_dev;
6302 int i_scanned, i_passed;
6307 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6309 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6311 node_detected_dev = list_entry(all_detected_devices.next,
6312 struct detected_devices_node, list);
6313 list_del(&node_detected_dev->list);
6314 dev = node_detected_dev->dev;
6315 kfree(node_detected_dev);
6316 rdev = md_import_device(dev,0, 90);
6320 if (test_bit(Faulty, &rdev->flags)) {
6324 set_bit(AutoDetected, &rdev->flags);
6325 list_add(&rdev->same_set, &pending_raid_disks);
6329 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6330 i_scanned, i_passed);
6332 autorun_devices(part);
6335 #endif /* !MODULE */
6337 static __exit void md_exit(void)
6340 struct list_head *tmp;
6342 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6343 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6345 unregister_blkdev(MAJOR_NR,"md");
6346 unregister_blkdev(mdp_major, "mdp");
6347 unregister_reboot_notifier(&md_notifier);
6348 unregister_sysctl_table(raid_table_header);
6349 remove_proc_entry("mdstat", NULL);
6350 for_each_mddev(mddev, tmp) {
6351 struct gendisk *disk = mddev->gendisk;
6354 export_array(mddev);
6357 mddev->gendisk = NULL;
6362 subsys_initcall(md_init);
6363 module_exit(md_exit)
6365 static int get_ro(char *buffer, struct kernel_param *kp)
6367 return sprintf(buffer, "%d", start_readonly);
6369 static int set_ro(const char *val, struct kernel_param *kp)
6372 int num = simple_strtoul(val, &e, 10);
6373 if (*val && (*e == '\0' || *e == '\n')) {
6374 start_readonly = num;
6380 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6381 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6384 EXPORT_SYMBOL(register_md_personality);
6385 EXPORT_SYMBOL(unregister_md_personality);
6386 EXPORT_SYMBOL(md_error);
6387 EXPORT_SYMBOL(md_done_sync);
6388 EXPORT_SYMBOL(md_write_start);
6389 EXPORT_SYMBOL(md_write_end);
6390 EXPORT_SYMBOL(md_register_thread);
6391 EXPORT_SYMBOL(md_unregister_thread);
6392 EXPORT_SYMBOL(md_wakeup_thread);
6393 EXPORT_SYMBOL(md_check_recovery);
6394 MODULE_LICENSE("GPL");
6396 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);