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/kthread.h>
36 #include <linux/raid/md.h>
37 #include <linux/raid/bitmap.h>
38 #include <linux/sysctl.h>
39 #include <linux/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/delay.h>
49 #define MAJOR_NR MD_MAJOR
51 /* 63 partitions with the alternate major number (mdp) */
52 #define MdpMinorShift 6
55 #define dprintk(x...) ((void)(DEBUG && printk(x)))
59 static void autostart_arrays(int part);
62 static LIST_HEAD(pers_list);
63 static DEFINE_SPINLOCK(pers_lock);
65 static void md_print_devices(void);
67 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
69 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
72 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
73 * is 1000 KB/sec, so the extra system load does not show up that much.
74 * Increase it if you want to have more _guaranteed_ speed. Note that
75 * the RAID driver will use the maximum available bandwidth if the IO
76 * subsystem is idle. There is also an 'absolute maximum' reconstruction
77 * speed limit - in case reconstruction slows down your system despite
80 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
81 * or /sys/block/mdX/md/sync_speed_{min,max}
84 static int sysctl_speed_limit_min = 1000;
85 static int sysctl_speed_limit_max = 200000;
86 static inline int speed_min(mddev_t *mddev)
88 return mddev->sync_speed_min ?
89 mddev->sync_speed_min : sysctl_speed_limit_min;
92 static inline int speed_max(mddev_t *mddev)
94 return mddev->sync_speed_max ?
95 mddev->sync_speed_max : sysctl_speed_limit_max;
98 static struct ctl_table_header *raid_table_header;
100 static ctl_table raid_table[] = {
102 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
103 .procname = "speed_limit_min",
104 .data = &sysctl_speed_limit_min,
105 .maxlen = sizeof(int),
106 .mode = S_IRUGO|S_IWUSR,
107 .proc_handler = &proc_dointvec,
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
111 .procname = "speed_limit_max",
112 .data = &sysctl_speed_limit_max,
113 .maxlen = sizeof(int),
114 .mode = S_IRUGO|S_IWUSR,
115 .proc_handler = &proc_dointvec,
120 static ctl_table raid_dir_table[] = {
122 .ctl_name = DEV_RAID,
125 .mode = S_IRUGO|S_IXUGO,
131 static ctl_table raid_root_table[] = {
137 .child = raid_dir_table,
142 static struct block_device_operations md_fops;
144 static int start_readonly;
147 * We have a system wide 'event count' that is incremented
148 * on any 'interesting' event, and readers of /proc/mdstat
149 * can use 'poll' or 'select' to find out when the event
153 * start array, stop array, error, add device, remove device,
154 * start build, activate spare
156 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
157 static atomic_t md_event_count;
158 void md_new_event(mddev_t *mddev)
160 atomic_inc(&md_event_count);
161 wake_up(&md_event_waiters);
163 EXPORT_SYMBOL_GPL(md_new_event);
165 /* Alternate version that can be called from interrupts
166 * when calling sysfs_notify isn't needed.
168 static void md_new_event_inintr(mddev_t *mddev)
170 atomic_inc(&md_event_count);
171 wake_up(&md_event_waiters);
175 * Enables to iterate over all existing md arrays
176 * all_mddevs_lock protects this list.
178 static LIST_HEAD(all_mddevs);
179 static DEFINE_SPINLOCK(all_mddevs_lock);
183 * iterates through all used mddevs in the system.
184 * We take care to grab the all_mddevs_lock whenever navigating
185 * the list, and to always hold a refcount when unlocked.
186 * Any code which breaks out of this loop while own
187 * a reference to the current mddev and must mddev_put it.
189 #define for_each_mddev(mddev,tmp) \
191 for (({ spin_lock(&all_mddevs_lock); \
192 tmp = all_mddevs.next; \
194 ({ if (tmp != &all_mddevs) \
195 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
196 spin_unlock(&all_mddevs_lock); \
197 if (mddev) mddev_put(mddev); \
198 mddev = list_entry(tmp, mddev_t, all_mddevs); \
199 tmp != &all_mddevs;}); \
200 ({ spin_lock(&all_mddevs_lock); \
205 static int md_fail_request(struct request_queue *q, struct bio *bio)
211 static inline mddev_t *mddev_get(mddev_t *mddev)
213 atomic_inc(&mddev->active);
217 static void mddev_put(mddev_t *mddev)
219 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
221 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
222 list_del(&mddev->all_mddevs);
223 spin_unlock(&all_mddevs_lock);
225 blk_cleanup_queue(mddev->queue);
227 if (mddev->sysfs_state)
228 sysfs_put(mddev->sysfs_state);
229 mddev->sysfs_state = NULL;
230 kobject_put(&mddev->kobj);
232 spin_unlock(&all_mddevs_lock);
235 static mddev_t * mddev_find(dev_t unit)
237 mddev_t *mddev, *new = NULL;
240 spin_lock(&all_mddevs_lock);
241 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
242 if (mddev->unit == unit) {
244 spin_unlock(&all_mddevs_lock);
250 list_add(&new->all_mddevs, &all_mddevs);
251 spin_unlock(&all_mddevs_lock);
254 spin_unlock(&all_mddevs_lock);
256 new = kzalloc(sizeof(*new), GFP_KERNEL);
261 if (MAJOR(unit) == MD_MAJOR)
262 new->md_minor = MINOR(unit);
264 new->md_minor = MINOR(unit) >> MdpMinorShift;
266 mutex_init(&new->reconfig_mutex);
267 INIT_LIST_HEAD(&new->disks);
268 INIT_LIST_HEAD(&new->all_mddevs);
269 init_timer(&new->safemode_timer);
270 atomic_set(&new->active, 1);
271 atomic_set(&new->openers, 0);
272 spin_lock_init(&new->write_lock);
273 init_waitqueue_head(&new->sb_wait);
274 init_waitqueue_head(&new->recovery_wait);
275 new->reshape_position = MaxSector;
277 new->resync_max = MaxSector;
278 new->level = LEVEL_NONE;
283 static inline int mddev_lock(mddev_t * mddev)
285 return mutex_lock_interruptible(&mddev->reconfig_mutex);
288 static inline int mddev_trylock(mddev_t * mddev)
290 return mutex_trylock(&mddev->reconfig_mutex);
293 static inline void mddev_unlock(mddev_t * mddev)
295 mutex_unlock(&mddev->reconfig_mutex);
297 md_wakeup_thread(mddev->thread);
300 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
304 list_for_each_entry(rdev, &mddev->disks, same_set)
305 if (rdev->desc_nr == nr)
311 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
315 list_for_each_entry(rdev, &mddev->disks, same_set)
316 if (rdev->bdev->bd_dev == dev)
322 static struct mdk_personality *find_pers(int level, char *clevel)
324 struct mdk_personality *pers;
325 list_for_each_entry(pers, &pers_list, list) {
326 if (level != LEVEL_NONE && pers->level == level)
328 if (strcmp(pers->name, clevel)==0)
334 /* return the offset of the super block in 512byte sectors */
335 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
337 sector_t num_sectors = bdev->bd_inode->i_size / 512;
338 return MD_NEW_SIZE_SECTORS(num_sectors);
341 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
343 sector_t num_sectors = rdev->sb_start;
346 num_sectors &= ~((sector_t)chunk_size/512 - 1);
350 static int alloc_disk_sb(mdk_rdev_t * rdev)
355 rdev->sb_page = alloc_page(GFP_KERNEL);
356 if (!rdev->sb_page) {
357 printk(KERN_ALERT "md: out of memory.\n");
364 static void free_disk_sb(mdk_rdev_t * rdev)
367 put_page(rdev->sb_page);
369 rdev->sb_page = NULL;
376 static void super_written(struct bio *bio, int error)
378 mdk_rdev_t *rdev = bio->bi_private;
379 mddev_t *mddev = rdev->mddev;
381 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
382 printk("md: super_written gets error=%d, uptodate=%d\n",
383 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
384 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
385 md_error(mddev, rdev);
388 if (atomic_dec_and_test(&mddev->pending_writes))
389 wake_up(&mddev->sb_wait);
393 static void super_written_barrier(struct bio *bio, int error)
395 struct bio *bio2 = bio->bi_private;
396 mdk_rdev_t *rdev = bio2->bi_private;
397 mddev_t *mddev = rdev->mddev;
399 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
400 error == -EOPNOTSUPP) {
402 /* barriers don't appear to be supported :-( */
403 set_bit(BarriersNotsupp, &rdev->flags);
404 mddev->barriers_work = 0;
405 spin_lock_irqsave(&mddev->write_lock, flags);
406 bio2->bi_next = mddev->biolist;
407 mddev->biolist = bio2;
408 spin_unlock_irqrestore(&mddev->write_lock, flags);
409 wake_up(&mddev->sb_wait);
413 bio->bi_private = rdev;
414 super_written(bio, error);
418 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
419 sector_t sector, int size, struct page *page)
421 /* write first size bytes of page to sector of rdev
422 * Increment mddev->pending_writes before returning
423 * and decrement it on completion, waking up sb_wait
424 * if zero is reached.
425 * If an error occurred, call md_error
427 * As we might need to resubmit the request if BIO_RW_BARRIER
428 * causes ENOTSUPP, we allocate a spare bio...
430 struct bio *bio = bio_alloc(GFP_NOIO, 1);
431 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
433 bio->bi_bdev = rdev->bdev;
434 bio->bi_sector = sector;
435 bio_add_page(bio, page, size, 0);
436 bio->bi_private = rdev;
437 bio->bi_end_io = super_written;
440 atomic_inc(&mddev->pending_writes);
441 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
443 rw |= (1<<BIO_RW_BARRIER);
444 rbio = bio_clone(bio, GFP_NOIO);
445 rbio->bi_private = bio;
446 rbio->bi_end_io = super_written_barrier;
447 submit_bio(rw, rbio);
452 void md_super_wait(mddev_t *mddev)
454 /* wait for all superblock writes that were scheduled to complete.
455 * if any had to be retried (due to BARRIER problems), retry them
459 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
460 if (atomic_read(&mddev->pending_writes)==0)
462 while (mddev->biolist) {
464 spin_lock_irq(&mddev->write_lock);
465 bio = mddev->biolist;
466 mddev->biolist = bio->bi_next ;
468 spin_unlock_irq(&mddev->write_lock);
469 submit_bio(bio->bi_rw, bio);
473 finish_wait(&mddev->sb_wait, &wq);
476 static void bi_complete(struct bio *bio, int error)
478 complete((struct completion*)bio->bi_private);
481 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
482 struct page *page, int rw)
484 struct bio *bio = bio_alloc(GFP_NOIO, 1);
485 struct completion event;
488 rw |= (1 << BIO_RW_SYNC);
491 bio->bi_sector = sector;
492 bio_add_page(bio, page, size, 0);
493 init_completion(&event);
494 bio->bi_private = &event;
495 bio->bi_end_io = bi_complete;
497 wait_for_completion(&event);
499 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
503 EXPORT_SYMBOL_GPL(sync_page_io);
505 static int read_disk_sb(mdk_rdev_t * rdev, int size)
507 char b[BDEVNAME_SIZE];
508 if (!rdev->sb_page) {
516 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
522 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
523 bdevname(rdev->bdev,b));
527 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
529 return sb1->set_uuid0 == sb2->set_uuid0 &&
530 sb1->set_uuid1 == sb2->set_uuid1 &&
531 sb1->set_uuid2 == sb2->set_uuid2 &&
532 sb1->set_uuid3 == sb2->set_uuid3;
535 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
538 mdp_super_t *tmp1, *tmp2;
540 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
541 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
543 if (!tmp1 || !tmp2) {
545 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
553 * nr_disks is not constant
558 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
566 static u32 md_csum_fold(u32 csum)
568 csum = (csum & 0xffff) + (csum >> 16);
569 return (csum & 0xffff) + (csum >> 16);
572 static unsigned int calc_sb_csum(mdp_super_t * sb)
575 u32 *sb32 = (u32*)sb;
577 unsigned int disk_csum, csum;
579 disk_csum = sb->sb_csum;
582 for (i = 0; i < MD_SB_BYTES/4 ; i++)
584 csum = (newcsum & 0xffffffff) + (newcsum>>32);
588 /* This used to use csum_partial, which was wrong for several
589 * reasons including that different results are returned on
590 * different architectures. It isn't critical that we get exactly
591 * the same return value as before (we always csum_fold before
592 * testing, and that removes any differences). However as we
593 * know that csum_partial always returned a 16bit value on
594 * alphas, do a fold to maximise conformity to previous behaviour.
596 sb->sb_csum = md_csum_fold(disk_csum);
598 sb->sb_csum = disk_csum;
605 * Handle superblock details.
606 * We want to be able to handle multiple superblock formats
607 * so we have a common interface to them all, and an array of
608 * different handlers.
609 * We rely on user-space to write the initial superblock, and support
610 * reading and updating of superblocks.
611 * Interface methods are:
612 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
613 * loads and validates a superblock on dev.
614 * if refdev != NULL, compare superblocks on both devices
616 * 0 - dev has a superblock that is compatible with refdev
617 * 1 - dev has a superblock that is compatible and newer than refdev
618 * so dev should be used as the refdev in future
619 * -EINVAL superblock incompatible or invalid
620 * -othererror e.g. -EIO
622 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
623 * Verify that dev is acceptable into mddev.
624 * The first time, mddev->raid_disks will be 0, and data from
625 * dev should be merged in. Subsequent calls check that dev
626 * is new enough. Return 0 or -EINVAL
628 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
629 * Update the superblock for rdev with data in mddev
630 * This does not write to disc.
636 struct module *owner;
637 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
639 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
640 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
641 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
642 sector_t num_sectors);
646 * load_super for 0.90.0
648 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
650 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
655 * Calculate the position of the superblock (512byte sectors),
656 * it's at the end of the disk.
658 * It also happens to be a multiple of 4Kb.
660 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
662 ret = read_disk_sb(rdev, MD_SB_BYTES);
667 bdevname(rdev->bdev, b);
668 sb = (mdp_super_t*)page_address(rdev->sb_page);
670 if (sb->md_magic != MD_SB_MAGIC) {
671 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
676 if (sb->major_version != 0 ||
677 sb->minor_version < 90 ||
678 sb->minor_version > 91) {
679 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
680 sb->major_version, sb->minor_version,
685 if (sb->raid_disks <= 0)
688 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
689 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
694 rdev->preferred_minor = sb->md_minor;
695 rdev->data_offset = 0;
696 rdev->sb_size = MD_SB_BYTES;
698 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
699 if (sb->level != 1 && sb->level != 4
700 && sb->level != 5 && sb->level != 6
701 && sb->level != 10) {
702 /* FIXME use a better test */
704 "md: bitmaps not supported for this level.\n");
709 if (sb->level == LEVEL_MULTIPATH)
712 rdev->desc_nr = sb->this_disk.number;
718 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
719 if (!uuid_equal(refsb, sb)) {
720 printk(KERN_WARNING "md: %s has different UUID to %s\n",
721 b, bdevname(refdev->bdev,b2));
724 if (!sb_equal(refsb, sb)) {
725 printk(KERN_WARNING "md: %s has same UUID"
726 " but different superblock to %s\n",
727 b, bdevname(refdev->bdev, b2));
731 ev2 = md_event(refsb);
737 rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2;
739 if (rdev->size < sb->size && sb->level > 1)
740 /* "this cannot possibly happen" ... */
748 * validate_super for 0.90.0
750 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
753 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
754 __u64 ev1 = md_event(sb);
756 rdev->raid_disk = -1;
757 clear_bit(Faulty, &rdev->flags);
758 clear_bit(In_sync, &rdev->flags);
759 clear_bit(WriteMostly, &rdev->flags);
760 clear_bit(BarriersNotsupp, &rdev->flags);
762 if (mddev->raid_disks == 0) {
763 mddev->major_version = 0;
764 mddev->minor_version = sb->minor_version;
765 mddev->patch_version = sb->patch_version;
767 mddev->chunk_size = sb->chunk_size;
768 mddev->ctime = sb->ctime;
769 mddev->utime = sb->utime;
770 mddev->level = sb->level;
771 mddev->clevel[0] = 0;
772 mddev->layout = sb->layout;
773 mddev->raid_disks = sb->raid_disks;
774 mddev->size = sb->size;
776 mddev->bitmap_offset = 0;
777 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
779 if (mddev->minor_version >= 91) {
780 mddev->reshape_position = sb->reshape_position;
781 mddev->delta_disks = sb->delta_disks;
782 mddev->new_level = sb->new_level;
783 mddev->new_layout = sb->new_layout;
784 mddev->new_chunk = sb->new_chunk;
786 mddev->reshape_position = MaxSector;
787 mddev->delta_disks = 0;
788 mddev->new_level = mddev->level;
789 mddev->new_layout = mddev->layout;
790 mddev->new_chunk = mddev->chunk_size;
793 if (sb->state & (1<<MD_SB_CLEAN))
794 mddev->recovery_cp = MaxSector;
796 if (sb->events_hi == sb->cp_events_hi &&
797 sb->events_lo == sb->cp_events_lo) {
798 mddev->recovery_cp = sb->recovery_cp;
800 mddev->recovery_cp = 0;
803 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
804 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
805 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
806 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
808 mddev->max_disks = MD_SB_DISKS;
810 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
811 mddev->bitmap_file == NULL)
812 mddev->bitmap_offset = mddev->default_bitmap_offset;
814 } else if (mddev->pers == NULL) {
815 /* Insist on good event counter while assembling */
817 if (ev1 < mddev->events)
819 } else if (mddev->bitmap) {
820 /* if adding to array with a bitmap, then we can accept an
821 * older device ... but not too old.
823 if (ev1 < mddev->bitmap->events_cleared)
826 if (ev1 < mddev->events)
827 /* just a hot-add of a new device, leave raid_disk at -1 */
831 if (mddev->level != LEVEL_MULTIPATH) {
832 desc = sb->disks + rdev->desc_nr;
834 if (desc->state & (1<<MD_DISK_FAULTY))
835 set_bit(Faulty, &rdev->flags);
836 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
837 desc->raid_disk < mddev->raid_disks */) {
838 set_bit(In_sync, &rdev->flags);
839 rdev->raid_disk = desc->raid_disk;
841 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
842 set_bit(WriteMostly, &rdev->flags);
843 } else /* MULTIPATH are always insync */
844 set_bit(In_sync, &rdev->flags);
849 * sync_super for 0.90.0
851 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
855 int next_spare = mddev->raid_disks;
858 /* make rdev->sb match mddev data..
861 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
862 * 3/ any empty disks < next_spare become removed
864 * disks[0] gets initialised to REMOVED because
865 * we cannot be sure from other fields if it has
866 * been initialised or not.
869 int active=0, working=0,failed=0,spare=0,nr_disks=0;
871 rdev->sb_size = MD_SB_BYTES;
873 sb = (mdp_super_t*)page_address(rdev->sb_page);
875 memset(sb, 0, sizeof(*sb));
877 sb->md_magic = MD_SB_MAGIC;
878 sb->major_version = mddev->major_version;
879 sb->patch_version = mddev->patch_version;
880 sb->gvalid_words = 0; /* ignored */
881 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
882 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
883 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
884 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
886 sb->ctime = mddev->ctime;
887 sb->level = mddev->level;
888 sb->size = mddev->size;
889 sb->raid_disks = mddev->raid_disks;
890 sb->md_minor = mddev->md_minor;
891 sb->not_persistent = 0;
892 sb->utime = mddev->utime;
894 sb->events_hi = (mddev->events>>32);
895 sb->events_lo = (u32)mddev->events;
897 if (mddev->reshape_position == MaxSector)
898 sb->minor_version = 90;
900 sb->minor_version = 91;
901 sb->reshape_position = mddev->reshape_position;
902 sb->new_level = mddev->new_level;
903 sb->delta_disks = mddev->delta_disks;
904 sb->new_layout = mddev->new_layout;
905 sb->new_chunk = mddev->new_chunk;
907 mddev->minor_version = sb->minor_version;
910 sb->recovery_cp = mddev->recovery_cp;
911 sb->cp_events_hi = (mddev->events>>32);
912 sb->cp_events_lo = (u32)mddev->events;
913 if (mddev->recovery_cp == MaxSector)
914 sb->state = (1<< MD_SB_CLEAN);
918 sb->layout = mddev->layout;
919 sb->chunk_size = mddev->chunk_size;
921 if (mddev->bitmap && mddev->bitmap_file == NULL)
922 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
924 sb->disks[0].state = (1<<MD_DISK_REMOVED);
925 list_for_each_entry(rdev2, &mddev->disks, same_set) {
928 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
929 && !test_bit(Faulty, &rdev2->flags))
930 desc_nr = rdev2->raid_disk;
932 desc_nr = next_spare++;
933 rdev2->desc_nr = desc_nr;
934 d = &sb->disks[rdev2->desc_nr];
936 d->number = rdev2->desc_nr;
937 d->major = MAJOR(rdev2->bdev->bd_dev);
938 d->minor = MINOR(rdev2->bdev->bd_dev);
939 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
940 && !test_bit(Faulty, &rdev2->flags))
941 d->raid_disk = rdev2->raid_disk;
943 d->raid_disk = rdev2->desc_nr; /* compatibility */
944 if (test_bit(Faulty, &rdev2->flags))
945 d->state = (1<<MD_DISK_FAULTY);
946 else if (test_bit(In_sync, &rdev2->flags)) {
947 d->state = (1<<MD_DISK_ACTIVE);
948 d->state |= (1<<MD_DISK_SYNC);
956 if (test_bit(WriteMostly, &rdev2->flags))
957 d->state |= (1<<MD_DISK_WRITEMOSTLY);
959 /* now set the "removed" and "faulty" bits on any missing devices */
960 for (i=0 ; i < mddev->raid_disks ; i++) {
961 mdp_disk_t *d = &sb->disks[i];
962 if (d->state == 0 && d->number == 0) {
965 d->state = (1<<MD_DISK_REMOVED);
966 d->state |= (1<<MD_DISK_FAULTY);
970 sb->nr_disks = nr_disks;
971 sb->active_disks = active;
972 sb->working_disks = working;
973 sb->failed_disks = failed;
974 sb->spare_disks = spare;
976 sb->this_disk = sb->disks[rdev->desc_nr];
977 sb->sb_csum = calc_sb_csum(sb);
981 * rdev_size_change for 0.90.0
983 static unsigned long long
984 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
986 if (num_sectors && num_sectors < rdev->mddev->size * 2)
987 return 0; /* component must fit device */
988 if (rdev->mddev->bitmap_offset)
989 return 0; /* can't move bitmap */
990 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
991 if (!num_sectors || num_sectors > rdev->sb_start)
992 num_sectors = rdev->sb_start;
993 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
995 md_super_wait(rdev->mddev);
996 return num_sectors / 2; /* kB for sysfs */
1001 * version 1 superblock
1004 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1008 unsigned long long newcsum;
1009 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1010 __le32 *isuper = (__le32*)sb;
1013 disk_csum = sb->sb_csum;
1016 for (i=0; size>=4; size -= 4 )
1017 newcsum += le32_to_cpu(*isuper++);
1020 newcsum += le16_to_cpu(*(__le16*) isuper);
1022 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1023 sb->sb_csum = disk_csum;
1024 return cpu_to_le32(csum);
1027 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1029 struct mdp_superblock_1 *sb;
1032 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1036 * Calculate the position of the superblock in 512byte sectors.
1037 * It is always aligned to a 4K boundary and
1038 * depeding on minor_version, it can be:
1039 * 0: At least 8K, but less than 12K, from end of device
1040 * 1: At start of device
1041 * 2: 4K from start of device.
1043 switch(minor_version) {
1045 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1047 sb_start &= ~(sector_t)(4*2-1);
1058 rdev->sb_start = sb_start;
1060 /* superblock is rarely larger than 1K, but it can be larger,
1061 * and it is safe to read 4k, so we do that
1063 ret = read_disk_sb(rdev, 4096);
1064 if (ret) return ret;
1067 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1069 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1070 sb->major_version != cpu_to_le32(1) ||
1071 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1072 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1073 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1076 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1077 printk("md: invalid superblock checksum on %s\n",
1078 bdevname(rdev->bdev,b));
1081 if (le64_to_cpu(sb->data_size) < 10) {
1082 printk("md: data_size too small on %s\n",
1083 bdevname(rdev->bdev,b));
1086 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1087 if (sb->level != cpu_to_le32(1) &&
1088 sb->level != cpu_to_le32(4) &&
1089 sb->level != cpu_to_le32(5) &&
1090 sb->level != cpu_to_le32(6) &&
1091 sb->level != cpu_to_le32(10)) {
1093 "md: bitmaps not supported for this level.\n");
1098 rdev->preferred_minor = 0xffff;
1099 rdev->data_offset = le64_to_cpu(sb->data_offset);
1100 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1102 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1103 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1104 if (rdev->sb_size & bmask)
1105 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1108 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1111 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1114 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1120 struct mdp_superblock_1 *refsb =
1121 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1123 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1124 sb->level != refsb->level ||
1125 sb->layout != refsb->layout ||
1126 sb->chunksize != refsb->chunksize) {
1127 printk(KERN_WARNING "md: %s has strangely different"
1128 " superblock to %s\n",
1129 bdevname(rdev->bdev,b),
1130 bdevname(refdev->bdev,b2));
1133 ev1 = le64_to_cpu(sb->events);
1134 ev2 = le64_to_cpu(refsb->events);
1142 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1144 rdev->size = rdev->sb_start / 2;
1145 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1147 rdev->size = le64_to_cpu(sb->data_size)/2;
1148 if (le32_to_cpu(sb->chunksize))
1149 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1151 if (le64_to_cpu(sb->size) > rdev->size*2)
1156 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1158 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1159 __u64 ev1 = le64_to_cpu(sb->events);
1161 rdev->raid_disk = -1;
1162 clear_bit(Faulty, &rdev->flags);
1163 clear_bit(In_sync, &rdev->flags);
1164 clear_bit(WriteMostly, &rdev->flags);
1165 clear_bit(BarriersNotsupp, &rdev->flags);
1167 if (mddev->raid_disks == 0) {
1168 mddev->major_version = 1;
1169 mddev->patch_version = 0;
1170 mddev->external = 0;
1171 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1172 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1173 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1174 mddev->level = le32_to_cpu(sb->level);
1175 mddev->clevel[0] = 0;
1176 mddev->layout = le32_to_cpu(sb->layout);
1177 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1178 mddev->size = le64_to_cpu(sb->size)/2;
1179 mddev->events = ev1;
1180 mddev->bitmap_offset = 0;
1181 mddev->default_bitmap_offset = 1024 >> 9;
1183 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1184 memcpy(mddev->uuid, sb->set_uuid, 16);
1186 mddev->max_disks = (4096-256)/2;
1188 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1189 mddev->bitmap_file == NULL )
1190 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1192 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1193 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1194 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1195 mddev->new_level = le32_to_cpu(sb->new_level);
1196 mddev->new_layout = le32_to_cpu(sb->new_layout);
1197 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1199 mddev->reshape_position = MaxSector;
1200 mddev->delta_disks = 0;
1201 mddev->new_level = mddev->level;
1202 mddev->new_layout = mddev->layout;
1203 mddev->new_chunk = mddev->chunk_size;
1206 } else if (mddev->pers == NULL) {
1207 /* Insist of good event counter while assembling */
1209 if (ev1 < mddev->events)
1211 } else if (mddev->bitmap) {
1212 /* If adding to array with a bitmap, then we can accept an
1213 * older device, but not too old.
1215 if (ev1 < mddev->bitmap->events_cleared)
1218 if (ev1 < mddev->events)
1219 /* just a hot-add of a new device, leave raid_disk at -1 */
1222 if (mddev->level != LEVEL_MULTIPATH) {
1224 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1226 case 0xffff: /* spare */
1228 case 0xfffe: /* faulty */
1229 set_bit(Faulty, &rdev->flags);
1232 if ((le32_to_cpu(sb->feature_map) &
1233 MD_FEATURE_RECOVERY_OFFSET))
1234 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1236 set_bit(In_sync, &rdev->flags);
1237 rdev->raid_disk = role;
1240 if (sb->devflags & WriteMostly1)
1241 set_bit(WriteMostly, &rdev->flags);
1242 } else /* MULTIPATH are always insync */
1243 set_bit(In_sync, &rdev->flags);
1248 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1250 struct mdp_superblock_1 *sb;
1253 /* make rdev->sb match mddev and rdev data. */
1255 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1257 sb->feature_map = 0;
1259 sb->recovery_offset = cpu_to_le64(0);
1260 memset(sb->pad1, 0, sizeof(sb->pad1));
1261 memset(sb->pad2, 0, sizeof(sb->pad2));
1262 memset(sb->pad3, 0, sizeof(sb->pad3));
1264 sb->utime = cpu_to_le64((__u64)mddev->utime);
1265 sb->events = cpu_to_le64(mddev->events);
1267 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1269 sb->resync_offset = cpu_to_le64(0);
1271 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1273 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1274 sb->size = cpu_to_le64(mddev->size<<1);
1276 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1277 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1278 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1281 if (rdev->raid_disk >= 0 &&
1282 !test_bit(In_sync, &rdev->flags) &&
1283 rdev->recovery_offset > 0) {
1284 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1285 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1288 if (mddev->reshape_position != MaxSector) {
1289 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1290 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1291 sb->new_layout = cpu_to_le32(mddev->new_layout);
1292 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1293 sb->new_level = cpu_to_le32(mddev->new_level);
1294 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1298 list_for_each_entry(rdev2, &mddev->disks, same_set)
1299 if (rdev2->desc_nr+1 > max_dev)
1300 max_dev = rdev2->desc_nr+1;
1302 if (max_dev > le32_to_cpu(sb->max_dev))
1303 sb->max_dev = cpu_to_le32(max_dev);
1304 for (i=0; i<max_dev;i++)
1305 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1307 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1309 if (test_bit(Faulty, &rdev2->flags))
1310 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1311 else if (test_bit(In_sync, &rdev2->flags))
1312 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1313 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1314 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1316 sb->dev_roles[i] = cpu_to_le16(0xffff);
1319 sb->sb_csum = calc_sb_1_csum(sb);
1322 static unsigned long long
1323 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1325 struct mdp_superblock_1 *sb;
1326 sector_t max_sectors;
1327 if (num_sectors && num_sectors < rdev->mddev->size * 2)
1328 return 0; /* component must fit device */
1329 if (rdev->sb_start < rdev->data_offset) {
1330 /* minor versions 1 and 2; superblock before data */
1331 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1332 max_sectors -= rdev->data_offset;
1333 if (!num_sectors || num_sectors > max_sectors)
1334 num_sectors = max_sectors;
1335 } else if (rdev->mddev->bitmap_offset) {
1336 /* minor version 0 with bitmap we can't move */
1339 /* minor version 0; superblock after data */
1341 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1342 sb_start &= ~(sector_t)(4*2 - 1);
1343 max_sectors = rdev->size * 2 + sb_start - rdev->sb_start;
1344 if (!num_sectors || num_sectors > max_sectors)
1345 num_sectors = max_sectors;
1346 rdev->sb_start = sb_start;
1348 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1349 sb->data_size = cpu_to_le64(num_sectors);
1350 sb->super_offset = rdev->sb_start;
1351 sb->sb_csum = calc_sb_1_csum(sb);
1352 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1354 md_super_wait(rdev->mddev);
1355 return num_sectors / 2; /* kB for sysfs */
1358 static struct super_type super_types[] = {
1361 .owner = THIS_MODULE,
1362 .load_super = super_90_load,
1363 .validate_super = super_90_validate,
1364 .sync_super = super_90_sync,
1365 .rdev_size_change = super_90_rdev_size_change,
1369 .owner = THIS_MODULE,
1370 .load_super = super_1_load,
1371 .validate_super = super_1_validate,
1372 .sync_super = super_1_sync,
1373 .rdev_size_change = super_1_rdev_size_change,
1377 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1379 mdk_rdev_t *rdev, *rdev2;
1382 rdev_for_each_rcu(rdev, mddev1)
1383 rdev_for_each_rcu(rdev2, mddev2)
1384 if (rdev->bdev->bd_contains ==
1385 rdev2->bdev->bd_contains) {
1393 static LIST_HEAD(pending_raid_disks);
1395 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1397 char b[BDEVNAME_SIZE];
1407 /* prevent duplicates */
1408 if (find_rdev(mddev, rdev->bdev->bd_dev))
1411 /* make sure rdev->size exceeds mddev->size */
1412 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1414 /* Cannot change size, so fail
1415 * If mddev->level <= 0, then we don't care
1416 * about aligning sizes (e.g. linear)
1418 if (mddev->level > 0)
1421 mddev->size = rdev->size;
1424 /* Verify rdev->desc_nr is unique.
1425 * If it is -1, assign a free number, else
1426 * check number is not in use
1428 if (rdev->desc_nr < 0) {
1430 if (mddev->pers) choice = mddev->raid_disks;
1431 while (find_rdev_nr(mddev, choice))
1433 rdev->desc_nr = choice;
1435 if (find_rdev_nr(mddev, rdev->desc_nr))
1438 bdevname(rdev->bdev,b);
1439 while ( (s=strchr(b, '/')) != NULL)
1442 rdev->mddev = mddev;
1443 printk(KERN_INFO "md: bind<%s>\n", b);
1445 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1448 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1449 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1450 kobject_del(&rdev->kobj);
1453 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1455 list_add_rcu(&rdev->same_set, &mddev->disks);
1456 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1460 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1465 static void md_delayed_delete(struct work_struct *ws)
1467 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1468 kobject_del(&rdev->kobj);
1469 kobject_put(&rdev->kobj);
1472 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1474 char b[BDEVNAME_SIZE];
1479 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1480 list_del_rcu(&rdev->same_set);
1481 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1483 sysfs_remove_link(&rdev->kobj, "block");
1484 sysfs_put(rdev->sysfs_state);
1485 rdev->sysfs_state = NULL;
1486 /* We need to delay this, otherwise we can deadlock when
1487 * writing to 'remove' to "dev/state". We also need
1488 * to delay it due to rcu usage.
1491 INIT_WORK(&rdev->del_work, md_delayed_delete);
1492 kobject_get(&rdev->kobj);
1493 schedule_work(&rdev->del_work);
1497 * prevent the device from being mounted, repartitioned or
1498 * otherwise reused by a RAID array (or any other kernel
1499 * subsystem), by bd_claiming the device.
1501 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1504 struct block_device *bdev;
1505 char b[BDEVNAME_SIZE];
1507 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1509 printk(KERN_ERR "md: could not open %s.\n",
1510 __bdevname(dev, b));
1511 return PTR_ERR(bdev);
1513 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1515 printk(KERN_ERR "md: could not bd_claim %s.\n",
1517 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1521 set_bit(AllReserved, &rdev->flags);
1526 static void unlock_rdev(mdk_rdev_t *rdev)
1528 struct block_device *bdev = rdev->bdev;
1533 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1536 void md_autodetect_dev(dev_t dev);
1538 static void export_rdev(mdk_rdev_t * rdev)
1540 char b[BDEVNAME_SIZE];
1541 printk(KERN_INFO "md: export_rdev(%s)\n",
1542 bdevname(rdev->bdev,b));
1547 if (test_bit(AutoDetected, &rdev->flags))
1548 md_autodetect_dev(rdev->bdev->bd_dev);
1551 kobject_put(&rdev->kobj);
1554 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1556 unbind_rdev_from_array(rdev);
1560 static void export_array(mddev_t *mddev)
1562 mdk_rdev_t *rdev, *tmp;
1564 rdev_for_each(rdev, tmp, mddev) {
1569 kick_rdev_from_array(rdev);
1571 if (!list_empty(&mddev->disks))
1573 mddev->raid_disks = 0;
1574 mddev->major_version = 0;
1577 static void print_desc(mdp_disk_t *desc)
1579 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1580 desc->major,desc->minor,desc->raid_disk,desc->state);
1583 static void print_sb_90(mdp_super_t *sb)
1588 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1589 sb->major_version, sb->minor_version, sb->patch_version,
1590 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1592 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1593 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1594 sb->md_minor, sb->layout, sb->chunk_size);
1595 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1596 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1597 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1598 sb->failed_disks, sb->spare_disks,
1599 sb->sb_csum, (unsigned long)sb->events_lo);
1602 for (i = 0; i < MD_SB_DISKS; i++) {
1605 desc = sb->disks + i;
1606 if (desc->number || desc->major || desc->minor ||
1607 desc->raid_disk || (desc->state && (desc->state != 4))) {
1608 printk(" D %2d: ", i);
1612 printk(KERN_INFO "md: THIS: ");
1613 print_desc(&sb->this_disk);
1616 static void print_sb_1(struct mdp_superblock_1 *sb)
1620 uuid = sb->set_uuid;
1621 printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1622 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1623 KERN_INFO "md: Name: \"%s\" CT:%llu\n",
1624 le32_to_cpu(sb->major_version),
1625 le32_to_cpu(sb->feature_map),
1626 uuid[0], uuid[1], uuid[2], uuid[3],
1627 uuid[4], uuid[5], uuid[6], uuid[7],
1628 uuid[8], uuid[9], uuid[10], uuid[11],
1629 uuid[12], uuid[13], uuid[14], uuid[15],
1631 (unsigned long long)le64_to_cpu(sb->ctime)
1632 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1634 uuid = sb->device_uuid;
1635 printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1637 KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1638 ":%02x%02x%02x%02x%02x%02x\n"
1639 KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1640 KERN_INFO "md: (MaxDev:%u) \n",
1641 le32_to_cpu(sb->level),
1642 (unsigned long long)le64_to_cpu(sb->size),
1643 le32_to_cpu(sb->raid_disks),
1644 le32_to_cpu(sb->layout),
1645 le32_to_cpu(sb->chunksize),
1646 (unsigned long long)le64_to_cpu(sb->data_offset),
1647 (unsigned long long)le64_to_cpu(sb->data_size),
1648 (unsigned long long)le64_to_cpu(sb->super_offset),
1649 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1650 le32_to_cpu(sb->dev_number),
1651 uuid[0], uuid[1], uuid[2], uuid[3],
1652 uuid[4], uuid[5], uuid[6], uuid[7],
1653 uuid[8], uuid[9], uuid[10], uuid[11],
1654 uuid[12], uuid[13], uuid[14], uuid[15],
1656 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1657 (unsigned long long)le64_to_cpu(sb->events),
1658 (unsigned long long)le64_to_cpu(sb->resync_offset),
1659 le32_to_cpu(sb->sb_csum),
1660 le32_to_cpu(sb->max_dev)
1664 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1666 char b[BDEVNAME_SIZE];
1667 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1668 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1669 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1671 if (rdev->sb_loaded) {
1672 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1673 switch (major_version) {
1675 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1678 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
1682 printk(KERN_INFO "md: no rdev superblock!\n");
1685 static void md_print_devices(void)
1687 struct list_head *tmp;
1690 char b[BDEVNAME_SIZE];
1693 printk("md: **********************************\n");
1694 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1695 printk("md: **********************************\n");
1696 for_each_mddev(mddev, tmp) {
1699 bitmap_print_sb(mddev->bitmap);
1701 printk("%s: ", mdname(mddev));
1702 list_for_each_entry(rdev, &mddev->disks, same_set)
1703 printk("<%s>", bdevname(rdev->bdev,b));
1706 list_for_each_entry(rdev, &mddev->disks, same_set)
1707 print_rdev(rdev, mddev->major_version);
1709 printk("md: **********************************\n");
1714 static void sync_sbs(mddev_t * mddev, int nospares)
1716 /* Update each superblock (in-memory image), but
1717 * if we are allowed to, skip spares which already
1718 * have the right event counter, or have one earlier
1719 * (which would mean they aren't being marked as dirty
1720 * with the rest of the array)
1724 list_for_each_entry(rdev, &mddev->disks, same_set) {
1725 if (rdev->sb_events == mddev->events ||
1727 rdev->raid_disk < 0 &&
1728 (rdev->sb_events&1)==0 &&
1729 rdev->sb_events+1 == mddev->events)) {
1730 /* Don't update this superblock */
1731 rdev->sb_loaded = 2;
1733 super_types[mddev->major_version].
1734 sync_super(mddev, rdev);
1735 rdev->sb_loaded = 1;
1740 static void md_update_sb(mddev_t * mddev, int force_change)
1746 if (mddev->external)
1749 spin_lock_irq(&mddev->write_lock);
1751 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1752 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1754 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1755 /* just a clean<-> dirty transition, possibly leave spares alone,
1756 * though if events isn't the right even/odd, we will have to do
1762 if (mddev->degraded)
1763 /* If the array is degraded, then skipping spares is both
1764 * dangerous and fairly pointless.
1765 * Dangerous because a device that was removed from the array
1766 * might have a event_count that still looks up-to-date,
1767 * so it can be re-added without a resync.
1768 * Pointless because if there are any spares to skip,
1769 * then a recovery will happen and soon that array won't
1770 * be degraded any more and the spare can go back to sleep then.
1774 sync_req = mddev->in_sync;
1775 mddev->utime = get_seconds();
1777 /* If this is just a dirty<->clean transition, and the array is clean
1778 * and 'events' is odd, we can roll back to the previous clean state */
1780 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1781 && (mddev->events & 1)
1782 && mddev->events != 1)
1785 /* otherwise we have to go forward and ... */
1787 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1788 /* .. if the array isn't clean, insist on an odd 'events' */
1789 if ((mddev->events&1)==0) {
1794 /* otherwise insist on an even 'events' (for clean states) */
1795 if ((mddev->events&1)) {
1802 if (!mddev->events) {
1804 * oops, this 64-bit counter should never wrap.
1805 * Either we are in around ~1 trillion A.C., assuming
1806 * 1 reboot per second, or we have a bug:
1813 * do not write anything to disk if using
1814 * nonpersistent superblocks
1816 if (!mddev->persistent) {
1817 if (!mddev->external)
1818 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1820 spin_unlock_irq(&mddev->write_lock);
1821 wake_up(&mddev->sb_wait);
1824 sync_sbs(mddev, nospares);
1825 spin_unlock_irq(&mddev->write_lock);
1828 "md: updating %s RAID superblock on device (in sync %d)\n",
1829 mdname(mddev),mddev->in_sync);
1831 bitmap_update_sb(mddev->bitmap);
1832 list_for_each_entry(rdev, &mddev->disks, same_set) {
1833 char b[BDEVNAME_SIZE];
1834 dprintk(KERN_INFO "md: ");
1835 if (rdev->sb_loaded != 1)
1836 continue; /* no noise on spare devices */
1837 if (test_bit(Faulty, &rdev->flags))
1838 dprintk("(skipping faulty ");
1840 dprintk("%s ", bdevname(rdev->bdev,b));
1841 if (!test_bit(Faulty, &rdev->flags)) {
1842 md_super_write(mddev,rdev,
1843 rdev->sb_start, rdev->sb_size,
1845 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1846 bdevname(rdev->bdev,b),
1847 (unsigned long long)rdev->sb_start);
1848 rdev->sb_events = mddev->events;
1852 if (mddev->level == LEVEL_MULTIPATH)
1853 /* only need to write one superblock... */
1856 md_super_wait(mddev);
1857 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1859 spin_lock_irq(&mddev->write_lock);
1860 if (mddev->in_sync != sync_req ||
1861 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1862 /* have to write it out again */
1863 spin_unlock_irq(&mddev->write_lock);
1866 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1867 spin_unlock_irq(&mddev->write_lock);
1868 wake_up(&mddev->sb_wait);
1872 /* words written to sysfs files may, or may not, be \n terminated.
1873 * We want to accept with case. For this we use cmd_match.
1875 static int cmd_match(const char *cmd, const char *str)
1877 /* See if cmd, written into a sysfs file, matches
1878 * str. They must either be the same, or cmd can
1879 * have a trailing newline
1881 while (*cmd && *str && *cmd == *str) {
1892 struct rdev_sysfs_entry {
1893 struct attribute attr;
1894 ssize_t (*show)(mdk_rdev_t *, char *);
1895 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1899 state_show(mdk_rdev_t *rdev, char *page)
1904 if (test_bit(Faulty, &rdev->flags)) {
1905 len+= sprintf(page+len, "%sfaulty",sep);
1908 if (test_bit(In_sync, &rdev->flags)) {
1909 len += sprintf(page+len, "%sin_sync",sep);
1912 if (test_bit(WriteMostly, &rdev->flags)) {
1913 len += sprintf(page+len, "%swrite_mostly",sep);
1916 if (test_bit(Blocked, &rdev->flags)) {
1917 len += sprintf(page+len, "%sblocked", sep);
1920 if (!test_bit(Faulty, &rdev->flags) &&
1921 !test_bit(In_sync, &rdev->flags)) {
1922 len += sprintf(page+len, "%sspare", sep);
1925 return len+sprintf(page+len, "\n");
1929 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1932 * faulty - simulates and error
1933 * remove - disconnects the device
1934 * writemostly - sets write_mostly
1935 * -writemostly - clears write_mostly
1936 * blocked - sets the Blocked flag
1937 * -blocked - clears the Blocked flag
1940 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1941 md_error(rdev->mddev, rdev);
1943 } else if (cmd_match(buf, "remove")) {
1944 if (rdev->raid_disk >= 0)
1947 mddev_t *mddev = rdev->mddev;
1948 kick_rdev_from_array(rdev);
1950 md_update_sb(mddev, 1);
1951 md_new_event(mddev);
1954 } else if (cmd_match(buf, "writemostly")) {
1955 set_bit(WriteMostly, &rdev->flags);
1957 } else if (cmd_match(buf, "-writemostly")) {
1958 clear_bit(WriteMostly, &rdev->flags);
1960 } else if (cmd_match(buf, "blocked")) {
1961 set_bit(Blocked, &rdev->flags);
1963 } else if (cmd_match(buf, "-blocked")) {
1964 clear_bit(Blocked, &rdev->flags);
1965 wake_up(&rdev->blocked_wait);
1966 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1967 md_wakeup_thread(rdev->mddev->thread);
1971 if (!err && rdev->sysfs_state)
1972 sysfs_notify_dirent(rdev->sysfs_state);
1973 return err ? err : len;
1975 static struct rdev_sysfs_entry rdev_state =
1976 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1979 errors_show(mdk_rdev_t *rdev, char *page)
1981 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1985 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1988 unsigned long n = simple_strtoul(buf, &e, 10);
1989 if (*buf && (*e == 0 || *e == '\n')) {
1990 atomic_set(&rdev->corrected_errors, n);
1995 static struct rdev_sysfs_entry rdev_errors =
1996 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1999 slot_show(mdk_rdev_t *rdev, char *page)
2001 if (rdev->raid_disk < 0)
2002 return sprintf(page, "none\n");
2004 return sprintf(page, "%d\n", rdev->raid_disk);
2008 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2013 int slot = simple_strtoul(buf, &e, 10);
2014 if (strncmp(buf, "none", 4)==0)
2016 else if (e==buf || (*e && *e!= '\n'))
2018 if (rdev->mddev->pers && slot == -1) {
2019 /* Setting 'slot' on an active array requires also
2020 * updating the 'rd%d' link, and communicating
2021 * with the personality with ->hot_*_disk.
2022 * For now we only support removing
2023 * failed/spare devices. This normally happens automatically,
2024 * but not when the metadata is externally managed.
2026 if (rdev->raid_disk == -1)
2028 /* personality does all needed checks */
2029 if (rdev->mddev->pers->hot_add_disk == NULL)
2031 err = rdev->mddev->pers->
2032 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2035 sprintf(nm, "rd%d", rdev->raid_disk);
2036 sysfs_remove_link(&rdev->mddev->kobj, nm);
2037 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2038 md_wakeup_thread(rdev->mddev->thread);
2039 } else if (rdev->mddev->pers) {
2041 /* Activating a spare .. or possibly reactivating
2042 * if we every get bitmaps working here.
2045 if (rdev->raid_disk != -1)
2048 if (rdev->mddev->pers->hot_add_disk == NULL)
2051 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2052 if (rdev2->raid_disk == slot)
2055 rdev->raid_disk = slot;
2056 if (test_bit(In_sync, &rdev->flags))
2057 rdev->saved_raid_disk = slot;
2059 rdev->saved_raid_disk = -1;
2060 err = rdev->mddev->pers->
2061 hot_add_disk(rdev->mddev, rdev);
2063 rdev->raid_disk = -1;
2066 sysfs_notify_dirent(rdev->sysfs_state);
2067 sprintf(nm, "rd%d", rdev->raid_disk);
2068 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2070 "md: cannot register "
2072 nm, mdname(rdev->mddev));
2074 /* don't wakeup anyone, leave that to userspace. */
2076 if (slot >= rdev->mddev->raid_disks)
2078 rdev->raid_disk = slot;
2079 /* assume it is working */
2080 clear_bit(Faulty, &rdev->flags);
2081 clear_bit(WriteMostly, &rdev->flags);
2082 set_bit(In_sync, &rdev->flags);
2083 sysfs_notify_dirent(rdev->sysfs_state);
2089 static struct rdev_sysfs_entry rdev_slot =
2090 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2093 offset_show(mdk_rdev_t *rdev, char *page)
2095 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2099 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2102 unsigned long long offset = simple_strtoull(buf, &e, 10);
2103 if (e==buf || (*e && *e != '\n'))
2105 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2107 if (rdev->size && rdev->mddev->external)
2108 /* Must set offset before size, so overlap checks
2111 rdev->data_offset = offset;
2115 static struct rdev_sysfs_entry rdev_offset =
2116 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2119 rdev_size_show(mdk_rdev_t *rdev, char *page)
2121 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2124 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2126 /* check if two start/length pairs overlap */
2135 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2137 unsigned long long size;
2138 unsigned long long oldsize = rdev->size;
2139 mddev_t *my_mddev = rdev->mddev;
2141 if (strict_strtoull(buf, 10, &size) < 0)
2143 if (my_mddev->pers && rdev->raid_disk >= 0) {
2144 if (my_mddev->persistent) {
2145 size = super_types[my_mddev->major_version].
2146 rdev_size_change(rdev, size * 2);
2150 size = (rdev->bdev->bd_inode->i_size >> 10);
2151 size -= rdev->data_offset/2;
2154 if (size < my_mddev->size)
2155 return -EINVAL; /* component must fit device */
2158 if (size > oldsize && my_mddev->external) {
2159 /* need to check that all other rdevs with the same ->bdev
2160 * do not overlap. We need to unlock the mddev to avoid
2161 * a deadlock. We have already changed rdev->size, and if
2162 * we have to change it back, we will have the lock again.
2166 struct list_head *tmp;
2168 mddev_unlock(my_mddev);
2169 for_each_mddev(mddev, tmp) {
2173 list_for_each_entry(rdev2, &mddev->disks, same_set)
2174 if (test_bit(AllReserved, &rdev2->flags) ||
2175 (rdev->bdev == rdev2->bdev &&
2177 overlaps(rdev->data_offset, rdev->size * 2,
2179 rdev2->size * 2))) {
2183 mddev_unlock(mddev);
2189 mddev_lock(my_mddev);
2191 /* Someone else could have slipped in a size
2192 * change here, but doing so is just silly.
2193 * We put oldsize back because we *know* it is
2194 * safe, and trust userspace not to race with
2197 rdev->size = oldsize;
2204 static struct rdev_sysfs_entry rdev_size =
2205 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2207 static struct attribute *rdev_default_attrs[] = {
2216 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2218 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2219 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2220 mddev_t *mddev = rdev->mddev;
2226 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2228 if (rdev->mddev == NULL)
2231 rv = entry->show(rdev, page);
2232 mddev_unlock(mddev);
2238 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2239 const char *page, size_t length)
2241 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2242 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2244 mddev_t *mddev = rdev->mddev;
2248 if (!capable(CAP_SYS_ADMIN))
2250 rv = mddev ? mddev_lock(mddev): -EBUSY;
2252 if (rdev->mddev == NULL)
2255 rv = entry->store(rdev, page, length);
2256 mddev_unlock(mddev);
2261 static void rdev_free(struct kobject *ko)
2263 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2266 static struct sysfs_ops rdev_sysfs_ops = {
2267 .show = rdev_attr_show,
2268 .store = rdev_attr_store,
2270 static struct kobj_type rdev_ktype = {
2271 .release = rdev_free,
2272 .sysfs_ops = &rdev_sysfs_ops,
2273 .default_attrs = rdev_default_attrs,
2277 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2279 * mark the device faulty if:
2281 * - the device is nonexistent (zero size)
2282 * - the device has no valid superblock
2284 * a faulty rdev _never_ has rdev->sb set.
2286 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2288 char b[BDEVNAME_SIZE];
2293 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2295 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2296 return ERR_PTR(-ENOMEM);
2299 if ((err = alloc_disk_sb(rdev)))
2302 err = lock_rdev(rdev, newdev, super_format == -2);
2306 kobject_init(&rdev->kobj, &rdev_ktype);
2309 rdev->saved_raid_disk = -1;
2310 rdev->raid_disk = -1;
2312 rdev->data_offset = 0;
2313 rdev->sb_events = 0;
2314 atomic_set(&rdev->nr_pending, 0);
2315 atomic_set(&rdev->read_errors, 0);
2316 atomic_set(&rdev->corrected_errors, 0);
2318 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2321 "md: %s has zero or unknown size, marking faulty!\n",
2322 bdevname(rdev->bdev,b));
2327 if (super_format >= 0) {
2328 err = super_types[super_format].
2329 load_super(rdev, NULL, super_minor);
2330 if (err == -EINVAL) {
2332 "md: %s does not have a valid v%d.%d "
2333 "superblock, not importing!\n",
2334 bdevname(rdev->bdev,b),
2335 super_format, super_minor);
2340 "md: could not read %s's sb, not importing!\n",
2341 bdevname(rdev->bdev,b));
2346 INIT_LIST_HEAD(&rdev->same_set);
2347 init_waitqueue_head(&rdev->blocked_wait);
2352 if (rdev->sb_page) {
2358 return ERR_PTR(err);
2362 * Check a full RAID array for plausibility
2366 static void analyze_sbs(mddev_t * mddev)
2369 mdk_rdev_t *rdev, *freshest, *tmp;
2370 char b[BDEVNAME_SIZE];
2373 rdev_for_each(rdev, tmp, mddev)
2374 switch (super_types[mddev->major_version].
2375 load_super(rdev, freshest, mddev->minor_version)) {
2383 "md: fatal superblock inconsistency in %s"
2384 " -- removing from array\n",
2385 bdevname(rdev->bdev,b));
2386 kick_rdev_from_array(rdev);
2390 super_types[mddev->major_version].
2391 validate_super(mddev, freshest);
2394 rdev_for_each(rdev, tmp, mddev) {
2395 if (rdev != freshest)
2396 if (super_types[mddev->major_version].
2397 validate_super(mddev, rdev)) {
2398 printk(KERN_WARNING "md: kicking non-fresh %s"
2400 bdevname(rdev->bdev,b));
2401 kick_rdev_from_array(rdev);
2404 if (mddev->level == LEVEL_MULTIPATH) {
2405 rdev->desc_nr = i++;
2406 rdev->raid_disk = rdev->desc_nr;
2407 set_bit(In_sync, &rdev->flags);
2408 } else if (rdev->raid_disk >= mddev->raid_disks) {
2409 rdev->raid_disk = -1;
2410 clear_bit(In_sync, &rdev->flags);
2416 if (mddev->recovery_cp != MaxSector &&
2418 printk(KERN_ERR "md: %s: raid array is not clean"
2419 " -- starting background reconstruction\n",
2424 static void md_safemode_timeout(unsigned long data);
2427 safe_delay_show(mddev_t *mddev, char *page)
2429 int msec = (mddev->safemode_delay*1000)/HZ;
2430 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2433 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2441 /* remove a period, and count digits after it */
2442 if (len >= sizeof(buf))
2444 strlcpy(buf, cbuf, sizeof(buf));
2445 for (i=0; i<len; i++) {
2447 if (isdigit(buf[i])) {
2452 } else if (buf[i] == '.') {
2457 if (strict_strtoul(buf, 10, &msec) < 0)
2459 msec = (msec * 1000) / scale;
2461 mddev->safemode_delay = 0;
2463 unsigned long old_delay = mddev->safemode_delay;
2464 mddev->safemode_delay = (msec*HZ)/1000;
2465 if (mddev->safemode_delay == 0)
2466 mddev->safemode_delay = 1;
2467 if (mddev->safemode_delay < old_delay)
2468 md_safemode_timeout((unsigned long)mddev);
2472 static struct md_sysfs_entry md_safe_delay =
2473 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2476 level_show(mddev_t *mddev, char *page)
2478 struct mdk_personality *p = mddev->pers;
2480 return sprintf(page, "%s\n", p->name);
2481 else if (mddev->clevel[0])
2482 return sprintf(page, "%s\n", mddev->clevel);
2483 else if (mddev->level != LEVEL_NONE)
2484 return sprintf(page, "%d\n", mddev->level);
2490 level_store(mddev_t *mddev, const char *buf, size_t len)
2497 if (len >= sizeof(mddev->clevel))
2499 strncpy(mddev->clevel, buf, len);
2500 if (mddev->clevel[len-1] == '\n')
2502 mddev->clevel[len] = 0;
2503 mddev->level = LEVEL_NONE;
2507 static struct md_sysfs_entry md_level =
2508 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2512 layout_show(mddev_t *mddev, char *page)
2514 /* just a number, not meaningful for all levels */
2515 if (mddev->reshape_position != MaxSector &&
2516 mddev->layout != mddev->new_layout)
2517 return sprintf(page, "%d (%d)\n",
2518 mddev->new_layout, mddev->layout);
2519 return sprintf(page, "%d\n", mddev->layout);
2523 layout_store(mddev_t *mddev, const char *buf, size_t len)
2526 unsigned long n = simple_strtoul(buf, &e, 10);
2528 if (!*buf || (*e && *e != '\n'))
2533 if (mddev->reshape_position != MaxSector)
2534 mddev->new_layout = n;
2539 static struct md_sysfs_entry md_layout =
2540 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2544 raid_disks_show(mddev_t *mddev, char *page)
2546 if (mddev->raid_disks == 0)
2548 if (mddev->reshape_position != MaxSector &&
2549 mddev->delta_disks != 0)
2550 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2551 mddev->raid_disks - mddev->delta_disks);
2552 return sprintf(page, "%d\n", mddev->raid_disks);
2555 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2558 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2562 unsigned long n = simple_strtoul(buf, &e, 10);
2564 if (!*buf || (*e && *e != '\n'))
2568 rv = update_raid_disks(mddev, n);
2569 else if (mddev->reshape_position != MaxSector) {
2570 int olddisks = mddev->raid_disks - mddev->delta_disks;
2571 mddev->delta_disks = n - olddisks;
2572 mddev->raid_disks = n;
2574 mddev->raid_disks = n;
2575 return rv ? rv : len;
2577 static struct md_sysfs_entry md_raid_disks =
2578 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2581 chunk_size_show(mddev_t *mddev, char *page)
2583 if (mddev->reshape_position != MaxSector &&
2584 mddev->chunk_size != mddev->new_chunk)
2585 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2587 return sprintf(page, "%d\n", mddev->chunk_size);
2591 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2593 /* can only set chunk_size if array is not yet active */
2595 unsigned long n = simple_strtoul(buf, &e, 10);
2597 if (!*buf || (*e && *e != '\n'))
2602 else if (mddev->reshape_position != MaxSector)
2603 mddev->new_chunk = n;
2605 mddev->chunk_size = n;
2608 static struct md_sysfs_entry md_chunk_size =
2609 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2612 resync_start_show(mddev_t *mddev, char *page)
2614 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2618 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2621 unsigned long long n = simple_strtoull(buf, &e, 10);
2625 if (!*buf || (*e && *e != '\n'))
2628 mddev->recovery_cp = n;
2631 static struct md_sysfs_entry md_resync_start =
2632 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2635 * The array state can be:
2638 * No devices, no size, no level
2639 * Equivalent to STOP_ARRAY ioctl
2641 * May have some settings, but array is not active
2642 * all IO results in error
2643 * When written, doesn't tear down array, but just stops it
2644 * suspended (not supported yet)
2645 * All IO requests will block. The array can be reconfigured.
2646 * Writing this, if accepted, will block until array is quiescent
2648 * no resync can happen. no superblocks get written.
2649 * write requests fail
2651 * like readonly, but behaves like 'clean' on a write request.
2653 * clean - no pending writes, but otherwise active.
2654 * When written to inactive array, starts without resync
2655 * If a write request arrives then
2656 * if metadata is known, mark 'dirty' and switch to 'active'.
2657 * if not known, block and switch to write-pending
2658 * If written to an active array that has pending writes, then fails.
2660 * fully active: IO and resync can be happening.
2661 * When written to inactive array, starts with resync
2664 * clean, but writes are blocked waiting for 'active' to be written.
2667 * like active, but no writes have been seen for a while (100msec).
2670 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2671 write_pending, active_idle, bad_word};
2672 static char *array_states[] = {
2673 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2674 "write-pending", "active-idle", NULL };
2676 static int match_word(const char *word, char **list)
2679 for (n=0; list[n]; n++)
2680 if (cmd_match(word, list[n]))
2686 array_state_show(mddev_t *mddev, char *page)
2688 enum array_state st = inactive;
2701 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2703 else if (mddev->safemode)
2709 if (list_empty(&mddev->disks) &&
2710 mddev->raid_disks == 0 &&
2716 return sprintf(page, "%s\n", array_states[st]);
2719 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
2720 static int do_md_run(mddev_t * mddev);
2721 static int restart_array(mddev_t *mddev);
2724 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2727 enum array_state st = match_word(buf, array_states);
2732 /* stopping an active array */
2733 if (atomic_read(&mddev->openers) > 0)
2735 err = do_md_stop(mddev, 0, 0);
2738 /* stopping an active array */
2740 if (atomic_read(&mddev->openers) > 0)
2742 err = do_md_stop(mddev, 2, 0);
2744 err = 0; /* already inactive */
2747 break; /* not supported yet */
2750 err = do_md_stop(mddev, 1, 0);
2753 set_disk_ro(mddev->gendisk, 1);
2754 err = do_md_run(mddev);
2760 err = do_md_stop(mddev, 1, 0);
2761 else if (mddev->ro == 1)
2762 err = restart_array(mddev);
2765 set_disk_ro(mddev->gendisk, 0);
2769 err = do_md_run(mddev);
2774 restart_array(mddev);
2775 spin_lock_irq(&mddev->write_lock);
2776 if (atomic_read(&mddev->writes_pending) == 0) {
2777 if (mddev->in_sync == 0) {
2779 if (mddev->safemode == 1)
2780 mddev->safemode = 0;
2781 if (mddev->persistent)
2782 set_bit(MD_CHANGE_CLEAN,
2788 spin_unlock_irq(&mddev->write_lock);
2791 mddev->recovery_cp = MaxSector;
2792 err = do_md_run(mddev);
2797 restart_array(mddev);
2798 if (mddev->external)
2799 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2800 wake_up(&mddev->sb_wait);
2804 set_disk_ro(mddev->gendisk, 0);
2805 err = do_md_run(mddev);
2810 /* these cannot be set */
2816 sysfs_notify_dirent(mddev->sysfs_state);
2820 static struct md_sysfs_entry md_array_state =
2821 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2824 null_show(mddev_t *mddev, char *page)
2830 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2832 /* buf must be %d:%d\n? giving major and minor numbers */
2833 /* The new device is added to the array.
2834 * If the array has a persistent superblock, we read the
2835 * superblock to initialise info and check validity.
2836 * Otherwise, only checking done is that in bind_rdev_to_array,
2837 * which mainly checks size.
2840 int major = simple_strtoul(buf, &e, 10);
2846 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2848 minor = simple_strtoul(e+1, &e, 10);
2849 if (*e && *e != '\n')
2851 dev = MKDEV(major, minor);
2852 if (major != MAJOR(dev) ||
2853 minor != MINOR(dev))
2857 if (mddev->persistent) {
2858 rdev = md_import_device(dev, mddev->major_version,
2859 mddev->minor_version);
2860 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2861 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2862 mdk_rdev_t, same_set);
2863 err = super_types[mddev->major_version]
2864 .load_super(rdev, rdev0, mddev->minor_version);
2868 } else if (mddev->external)
2869 rdev = md_import_device(dev, -2, -1);
2871 rdev = md_import_device(dev, -1, -1);
2874 return PTR_ERR(rdev);
2875 err = bind_rdev_to_array(rdev, mddev);
2879 return err ? err : len;
2882 static struct md_sysfs_entry md_new_device =
2883 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2886 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2889 unsigned long chunk, end_chunk;
2893 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2895 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2896 if (buf == end) break;
2897 if (*end == '-') { /* range */
2899 end_chunk = simple_strtoul(buf, &end, 0);
2900 if (buf == end) break;
2902 if (*end && !isspace(*end)) break;
2903 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2905 while (isspace(*buf)) buf++;
2907 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2912 static struct md_sysfs_entry md_bitmap =
2913 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2916 size_show(mddev_t *mddev, char *page)
2918 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2921 static int update_size(mddev_t *mddev, sector_t num_sectors);
2924 size_store(mddev_t *mddev, const char *buf, size_t len)
2926 /* If array is inactive, we can reduce the component size, but
2927 * not increase it (except from 0).
2928 * If array is active, we can try an on-line resize
2932 unsigned long long size = simple_strtoull(buf, &e, 10);
2933 if (!*buf || *buf == '\n' ||
2938 err = update_size(mddev, size * 2);
2939 md_update_sb(mddev, 1);
2941 if (mddev->size == 0 ||
2947 return err ? err : len;
2950 static struct md_sysfs_entry md_size =
2951 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2956 * 'none' for arrays with no metadata (good luck...)
2957 * 'external' for arrays with externally managed metadata,
2958 * or N.M for internally known formats
2961 metadata_show(mddev_t *mddev, char *page)
2963 if (mddev->persistent)
2964 return sprintf(page, "%d.%d\n",
2965 mddev->major_version, mddev->minor_version);
2966 else if (mddev->external)
2967 return sprintf(page, "external:%s\n", mddev->metadata_type);
2969 return sprintf(page, "none\n");
2973 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2977 /* Changing the details of 'external' metadata is
2978 * always permitted. Otherwise there must be
2979 * no devices attached to the array.
2981 if (mddev->external && strncmp(buf, "external:", 9) == 0)
2983 else if (!list_empty(&mddev->disks))
2986 if (cmd_match(buf, "none")) {
2987 mddev->persistent = 0;
2988 mddev->external = 0;
2989 mddev->major_version = 0;
2990 mddev->minor_version = 90;
2993 if (strncmp(buf, "external:", 9) == 0) {
2994 size_t namelen = len-9;
2995 if (namelen >= sizeof(mddev->metadata_type))
2996 namelen = sizeof(mddev->metadata_type)-1;
2997 strncpy(mddev->metadata_type, buf+9, namelen);
2998 mddev->metadata_type[namelen] = 0;
2999 if (namelen && mddev->metadata_type[namelen-1] == '\n')
3000 mddev->metadata_type[--namelen] = 0;
3001 mddev->persistent = 0;
3002 mddev->external = 1;
3003 mddev->major_version = 0;
3004 mddev->minor_version = 90;
3007 major = simple_strtoul(buf, &e, 10);
3008 if (e==buf || *e != '.')
3011 minor = simple_strtoul(buf, &e, 10);
3012 if (e==buf || (*e && *e != '\n') )
3014 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3016 mddev->major_version = major;
3017 mddev->minor_version = minor;
3018 mddev->persistent = 1;
3019 mddev->external = 0;
3023 static struct md_sysfs_entry md_metadata =
3024 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3027 action_show(mddev_t *mddev, char *page)
3029 char *type = "idle";
3030 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3031 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3032 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3034 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3035 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3037 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3041 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3044 return sprintf(page, "%s\n", type);
3048 action_store(mddev_t *mddev, const char *page, size_t len)
3050 if (!mddev->pers || !mddev->pers->sync_request)
3053 if (cmd_match(page, "idle")) {
3054 if (mddev->sync_thread) {
3055 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3056 md_unregister_thread(mddev->sync_thread);
3057 mddev->sync_thread = NULL;
3058 mddev->recovery = 0;
3060 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3061 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3063 else if (cmd_match(page, "resync"))
3064 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3065 else if (cmd_match(page, "recover")) {
3066 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3067 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3068 } else if (cmd_match(page, "reshape")) {
3070 if (mddev->pers->start_reshape == NULL)
3072 err = mddev->pers->start_reshape(mddev);
3075 sysfs_notify(&mddev->kobj, NULL, "degraded");
3077 if (cmd_match(page, "check"))
3078 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3079 else if (!cmd_match(page, "repair"))
3081 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3082 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3084 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3085 md_wakeup_thread(mddev->thread);
3086 sysfs_notify_dirent(mddev->sysfs_action);
3091 mismatch_cnt_show(mddev_t *mddev, char *page)
3093 return sprintf(page, "%llu\n",
3094 (unsigned long long) mddev->resync_mismatches);
3097 static struct md_sysfs_entry md_scan_mode =
3098 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3101 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3104 sync_min_show(mddev_t *mddev, char *page)
3106 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3107 mddev->sync_speed_min ? "local": "system");
3111 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3115 if (strncmp(buf, "system", 6)==0) {
3116 mddev->sync_speed_min = 0;
3119 min = simple_strtoul(buf, &e, 10);
3120 if (buf == e || (*e && *e != '\n') || min <= 0)
3122 mddev->sync_speed_min = min;
3126 static struct md_sysfs_entry md_sync_min =
3127 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3130 sync_max_show(mddev_t *mddev, char *page)
3132 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3133 mddev->sync_speed_max ? "local": "system");
3137 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3141 if (strncmp(buf, "system", 6)==0) {
3142 mddev->sync_speed_max = 0;
3145 max = simple_strtoul(buf, &e, 10);
3146 if (buf == e || (*e && *e != '\n') || max <= 0)
3148 mddev->sync_speed_max = max;
3152 static struct md_sysfs_entry md_sync_max =
3153 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3156 degraded_show(mddev_t *mddev, char *page)
3158 return sprintf(page, "%d\n", mddev->degraded);
3160 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3163 sync_force_parallel_show(mddev_t *mddev, char *page)
3165 return sprintf(page, "%d\n", mddev->parallel_resync);
3169 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3173 if (strict_strtol(buf, 10, &n))
3176 if (n != 0 && n != 1)
3179 mddev->parallel_resync = n;
3181 if (mddev->sync_thread)
3182 wake_up(&resync_wait);
3187 /* force parallel resync, even with shared block devices */
3188 static struct md_sysfs_entry md_sync_force_parallel =
3189 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3190 sync_force_parallel_show, sync_force_parallel_store);
3193 sync_speed_show(mddev_t *mddev, char *page)
3195 unsigned long resync, dt, db;
3196 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3197 dt = (jiffies - mddev->resync_mark) / HZ;
3199 db = resync - mddev->resync_mark_cnt;
3200 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3203 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3206 sync_completed_show(mddev_t *mddev, char *page)
3208 unsigned long max_blocks, resync;
3210 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3211 max_blocks = mddev->resync_max_sectors;
3213 max_blocks = mddev->size << 1;
3215 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3216 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3219 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3222 min_sync_show(mddev_t *mddev, char *page)
3224 return sprintf(page, "%llu\n",
3225 (unsigned long long)mddev->resync_min);
3228 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3230 unsigned long long min;
3231 if (strict_strtoull(buf, 10, &min))
3233 if (min > mddev->resync_max)
3235 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3238 /* Must be a multiple of chunk_size */
3239 if (mddev->chunk_size) {
3240 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3243 mddev->resync_min = min;
3248 static struct md_sysfs_entry md_min_sync =
3249 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3252 max_sync_show(mddev_t *mddev, char *page)
3254 if (mddev->resync_max == MaxSector)
3255 return sprintf(page, "max\n");
3257 return sprintf(page, "%llu\n",
3258 (unsigned long long)mddev->resync_max);
3261 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3263 if (strncmp(buf, "max", 3) == 0)
3264 mddev->resync_max = MaxSector;
3266 unsigned long long max;
3267 if (strict_strtoull(buf, 10, &max))
3269 if (max < mddev->resync_min)
3271 if (max < mddev->resync_max &&
3272 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3275 /* Must be a multiple of chunk_size */
3276 if (mddev->chunk_size) {
3277 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3280 mddev->resync_max = max;
3282 wake_up(&mddev->recovery_wait);
3286 static struct md_sysfs_entry md_max_sync =
3287 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3290 suspend_lo_show(mddev_t *mddev, char *page)
3292 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3296 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3299 unsigned long long new = simple_strtoull(buf, &e, 10);
3301 if (mddev->pers->quiesce == NULL)
3303 if (buf == e || (*e && *e != '\n'))
3305 if (new >= mddev->suspend_hi ||
3306 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3307 mddev->suspend_lo = new;
3308 mddev->pers->quiesce(mddev, 2);
3313 static struct md_sysfs_entry md_suspend_lo =
3314 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3318 suspend_hi_show(mddev_t *mddev, char *page)
3320 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3324 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3327 unsigned long long new = simple_strtoull(buf, &e, 10);
3329 if (mddev->pers->quiesce == NULL)
3331 if (buf == e || (*e && *e != '\n'))
3333 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3334 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3335 mddev->suspend_hi = new;
3336 mddev->pers->quiesce(mddev, 1);
3337 mddev->pers->quiesce(mddev, 0);
3342 static struct md_sysfs_entry md_suspend_hi =
3343 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3346 reshape_position_show(mddev_t *mddev, char *page)
3348 if (mddev->reshape_position != MaxSector)
3349 return sprintf(page, "%llu\n",
3350 (unsigned long long)mddev->reshape_position);
3351 strcpy(page, "none\n");
3356 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3359 unsigned long long new = simple_strtoull(buf, &e, 10);
3362 if (buf == e || (*e && *e != '\n'))
3364 mddev->reshape_position = new;
3365 mddev->delta_disks = 0;
3366 mddev->new_level = mddev->level;
3367 mddev->new_layout = mddev->layout;
3368 mddev->new_chunk = mddev->chunk_size;
3372 static struct md_sysfs_entry md_reshape_position =
3373 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3374 reshape_position_store);
3377 static struct attribute *md_default_attrs[] = {
3380 &md_raid_disks.attr,
3381 &md_chunk_size.attr,
3383 &md_resync_start.attr,
3385 &md_new_device.attr,
3386 &md_safe_delay.attr,
3387 &md_array_state.attr,
3388 &md_reshape_position.attr,
3392 static struct attribute *md_redundancy_attrs[] = {
3394 &md_mismatches.attr,
3397 &md_sync_speed.attr,
3398 &md_sync_force_parallel.attr,
3399 &md_sync_completed.attr,
3402 &md_suspend_lo.attr,
3403 &md_suspend_hi.attr,
3408 static struct attribute_group md_redundancy_group = {
3410 .attrs = md_redundancy_attrs,
3415 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3417 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3418 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3423 rv = mddev_lock(mddev);
3425 rv = entry->show(mddev, page);
3426 mddev_unlock(mddev);
3432 md_attr_store(struct kobject *kobj, struct attribute *attr,
3433 const char *page, size_t length)
3435 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3436 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3441 if (!capable(CAP_SYS_ADMIN))
3443 rv = mddev_lock(mddev);
3445 rv = entry->store(mddev, page, length);
3446 mddev_unlock(mddev);
3451 static void md_free(struct kobject *ko)
3453 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3457 static struct sysfs_ops md_sysfs_ops = {
3458 .show = md_attr_show,
3459 .store = md_attr_store,
3461 static struct kobj_type md_ktype = {
3463 .sysfs_ops = &md_sysfs_ops,
3464 .default_attrs = md_default_attrs,
3469 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3471 static DEFINE_MUTEX(disks_mutex);
3472 mddev_t *mddev = mddev_find(dev);
3473 struct gendisk *disk;
3474 int partitioned = (MAJOR(dev) != MD_MAJOR);
3475 int shift = partitioned ? MdpMinorShift : 0;
3476 int unit = MINOR(dev) >> shift;
3482 mutex_lock(&disks_mutex);
3483 if (mddev->gendisk) {
3484 mutex_unlock(&disks_mutex);
3489 mddev->queue = blk_alloc_queue(GFP_KERNEL);
3490 if (!mddev->queue) {
3491 mutex_unlock(&disks_mutex);
3495 /* Can be unlocked because the queue is new: no concurrency */
3496 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
3498 blk_queue_make_request(mddev->queue, md_fail_request);
3500 disk = alloc_disk(1 << shift);
3502 mutex_unlock(&disks_mutex);
3503 blk_cleanup_queue(mddev->queue);
3504 mddev->queue = NULL;
3508 disk->major = MAJOR(dev);
3509 disk->first_minor = unit << shift;
3511 sprintf(disk->disk_name, "md_d%d", unit);
3513 sprintf(disk->disk_name, "md%d", unit);
3514 disk->fops = &md_fops;
3515 disk->private_data = mddev;
3516 disk->queue = mddev->queue;
3517 /* Allow extended partitions. This makes the
3518 * 'mdp' device redundant, but we can really
3521 disk->flags |= GENHD_FL_EXT_DEVT;
3523 mddev->gendisk = disk;
3524 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3525 &disk_to_dev(disk)->kobj, "%s", "md");
3526 mutex_unlock(&disks_mutex);
3528 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3531 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3532 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
3537 static void md_safemode_timeout(unsigned long data)
3539 mddev_t *mddev = (mddev_t *) data;
3541 if (!atomic_read(&mddev->writes_pending)) {
3542 mddev->safemode = 1;
3543 if (mddev->external)
3544 sysfs_notify_dirent(mddev->sysfs_state);
3546 md_wakeup_thread(mddev->thread);
3549 static int start_dirty_degraded;
3551 static int do_md_run(mddev_t * mddev)
3556 struct gendisk *disk;
3557 struct mdk_personality *pers;
3558 char b[BDEVNAME_SIZE];
3560 if (list_empty(&mddev->disks))
3561 /* cannot run an array with no devices.. */
3568 * Analyze all RAID superblock(s)
3570 if (!mddev->raid_disks) {
3571 if (!mddev->persistent)
3576 chunk_size = mddev->chunk_size;
3579 if (chunk_size > MAX_CHUNK_SIZE) {
3580 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3581 chunk_size, MAX_CHUNK_SIZE);
3585 * chunk-size has to be a power of 2
3587 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3588 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3592 /* devices must have minimum size of one chunk */
3593 list_for_each_entry(rdev, &mddev->disks, same_set) {
3594 if (test_bit(Faulty, &rdev->flags))
3596 if (rdev->size < chunk_size / 1024) {
3598 "md: Dev %s smaller than chunk_size:"
3600 bdevname(rdev->bdev,b),
3601 (unsigned long long)rdev->size,
3608 if (mddev->level != LEVEL_NONE)
3609 request_module("md-level-%d", mddev->level);
3610 else if (mddev->clevel[0])
3611 request_module("md-%s", mddev->clevel);
3614 * Drop all container device buffers, from now on
3615 * the only valid external interface is through the md
3618 list_for_each_entry(rdev, &mddev->disks, same_set) {
3619 if (test_bit(Faulty, &rdev->flags))
3621 sync_blockdev(rdev->bdev);
3622 invalidate_bdev(rdev->bdev);
3624 /* perform some consistency tests on the device.
3625 * We don't want the data to overlap the metadata,
3626 * Internal Bitmap issues has handled elsewhere.
3628 if (rdev->data_offset < rdev->sb_start) {
3630 rdev->data_offset + mddev->size*2
3632 printk("md: %s: data overlaps metadata\n",
3637 if (rdev->sb_start + rdev->sb_size/512
3638 > rdev->data_offset) {
3639 printk("md: %s: metadata overlaps data\n",
3644 sysfs_notify_dirent(rdev->sysfs_state);
3647 md_probe(mddev->unit, NULL, NULL);
3648 disk = mddev->gendisk;
3652 spin_lock(&pers_lock);
3653 pers = find_pers(mddev->level, mddev->clevel);
3654 if (!pers || !try_module_get(pers->owner)) {
3655 spin_unlock(&pers_lock);
3656 if (mddev->level != LEVEL_NONE)
3657 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3660 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3665 spin_unlock(&pers_lock);
3666 mddev->level = pers->level;
3667 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3669 if (mddev->reshape_position != MaxSector &&
3670 pers->start_reshape == NULL) {
3671 /* This personality cannot handle reshaping... */
3673 module_put(pers->owner);
3677 if (pers->sync_request) {
3678 /* Warn if this is a potentially silly
3681 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3685 list_for_each_entry(rdev, &mddev->disks, same_set)
3686 list_for_each_entry(rdev2, &mddev->disks, same_set) {
3688 rdev->bdev->bd_contains ==
3689 rdev2->bdev->bd_contains) {
3691 "%s: WARNING: %s appears to be"
3692 " on the same physical disk as"
3695 bdevname(rdev->bdev,b),
3696 bdevname(rdev2->bdev,b2));
3703 "True protection against single-disk"
3704 " failure might be compromised.\n");
3707 mddev->recovery = 0;
3708 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3709 mddev->barriers_work = 1;
3710 mddev->ok_start_degraded = start_dirty_degraded;
3713 mddev->ro = 2; /* read-only, but switch on first write */
3715 err = mddev->pers->run(mddev);
3717 printk(KERN_ERR "md: pers->run() failed ...\n");
3718 else if (mddev->pers->sync_request) {
3719 err = bitmap_create(mddev);
3721 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3722 mdname(mddev), err);
3723 mddev->pers->stop(mddev);
3727 module_put(mddev->pers->owner);
3729 bitmap_destroy(mddev);
3732 if (mddev->pers->sync_request) {
3733 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3735 "md: cannot register extra attributes for %s\n",
3737 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3738 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3741 atomic_set(&mddev->writes_pending,0);
3742 mddev->safemode = 0;
3743 mddev->safemode_timer.function = md_safemode_timeout;
3744 mddev->safemode_timer.data = (unsigned long) mddev;
3745 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3748 list_for_each_entry(rdev, &mddev->disks, same_set)
3749 if (rdev->raid_disk >= 0) {
3751 sprintf(nm, "rd%d", rdev->raid_disk);
3752 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3753 printk("md: cannot register %s for %s\n",
3757 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3760 md_update_sb(mddev, 0);
3762 set_capacity(disk, mddev->array_sectors);
3764 /* If we call blk_queue_make_request here, it will
3765 * re-initialise max_sectors etc which may have been
3766 * refined inside -> run. So just set the bits we need to set.
3767 * Most initialisation happended when we called
3768 * blk_queue_make_request(..., md_fail_request)
3771 mddev->queue->queuedata = mddev;
3772 mddev->queue->make_request_fn = mddev->pers->make_request;
3774 /* If there is a partially-recovered drive we need to
3775 * start recovery here. If we leave it to md_check_recovery,
3776 * it will remove the drives and not do the right thing
3778 if (mddev->degraded && !mddev->sync_thread) {
3780 list_for_each_entry(rdev, &mddev->disks, same_set)
3781 if (rdev->raid_disk >= 0 &&
3782 !test_bit(In_sync, &rdev->flags) &&
3783 !test_bit(Faulty, &rdev->flags))
3784 /* complete an interrupted recovery */
3786 if (spares && mddev->pers->sync_request) {
3787 mddev->recovery = 0;
3788 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3789 mddev->sync_thread = md_register_thread(md_do_sync,
3792 if (!mddev->sync_thread) {
3793 printk(KERN_ERR "%s: could not start resync"
3796 /* leave the spares where they are, it shouldn't hurt */
3797 mddev->recovery = 0;
3801 md_wakeup_thread(mddev->thread);
3802 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3805 md_new_event(mddev);
3806 sysfs_notify_dirent(mddev->sysfs_state);
3807 if (mddev->sysfs_action)
3808 sysfs_notify_dirent(mddev->sysfs_action);
3809 sysfs_notify(&mddev->kobj, NULL, "degraded");
3810 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
3814 static int restart_array(mddev_t *mddev)
3816 struct gendisk *disk = mddev->gendisk;
3818 /* Complain if it has no devices */
3819 if (list_empty(&mddev->disks))
3825 mddev->safemode = 0;
3827 set_disk_ro(disk, 0);
3828 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3830 /* Kick recovery or resync if necessary */
3831 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3832 md_wakeup_thread(mddev->thread);
3833 md_wakeup_thread(mddev->sync_thread);
3834 sysfs_notify_dirent(mddev->sysfs_state);
3838 /* similar to deny_write_access, but accounts for our holding a reference
3839 * to the file ourselves */
3840 static int deny_bitmap_write_access(struct file * file)
3842 struct inode *inode = file->f_mapping->host;
3844 spin_lock(&inode->i_lock);
3845 if (atomic_read(&inode->i_writecount) > 1) {
3846 spin_unlock(&inode->i_lock);
3849 atomic_set(&inode->i_writecount, -1);
3850 spin_unlock(&inode->i_lock);
3855 static void restore_bitmap_write_access(struct file *file)
3857 struct inode *inode = file->f_mapping->host;
3859 spin_lock(&inode->i_lock);
3860 atomic_set(&inode->i_writecount, 1);
3861 spin_unlock(&inode->i_lock);
3865 * 0 - completely stop and dis-assemble array
3866 * 1 - switch to readonly
3867 * 2 - stop but do not disassemble array
3869 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
3872 struct gendisk *disk = mddev->gendisk;
3874 if (atomic_read(&mddev->openers) > is_open) {
3875 printk("md: %s still in use.\n",mdname(mddev));
3881 if (mddev->sync_thread) {
3882 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3883 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3884 md_unregister_thread(mddev->sync_thread);
3885 mddev->sync_thread = NULL;
3888 del_timer_sync(&mddev->safemode_timer);
3891 case 1: /* readonly */
3897 case 0: /* disassemble */
3899 bitmap_flush(mddev);
3900 md_super_wait(mddev);
3902 set_disk_ro(disk, 0);
3903 blk_queue_make_request(mddev->queue, md_fail_request);
3904 mddev->pers->stop(mddev);
3905 mddev->queue->merge_bvec_fn = NULL;
3906 mddev->queue->unplug_fn = NULL;
3907 mddev->queue->backing_dev_info.congested_fn = NULL;
3908 if (mddev->pers->sync_request) {
3909 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3910 if (mddev->sysfs_action)
3911 sysfs_put(mddev->sysfs_action);
3912 mddev->sysfs_action = NULL;
3914 module_put(mddev->pers->owner);
3916 /* tell userspace to handle 'inactive' */
3917 sysfs_notify_dirent(mddev->sysfs_state);
3919 set_capacity(disk, 0);
3925 if (!mddev->in_sync || mddev->flags) {
3926 /* mark array as shutdown cleanly */
3928 md_update_sb(mddev, 1);
3931 set_disk_ro(disk, 1);
3932 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3936 * Free resources if final stop
3941 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3943 bitmap_destroy(mddev);
3944 if (mddev->bitmap_file) {
3945 restore_bitmap_write_access(mddev->bitmap_file);
3946 fput(mddev->bitmap_file);
3947 mddev->bitmap_file = NULL;
3949 mddev->bitmap_offset = 0;
3951 list_for_each_entry(rdev, &mddev->disks, same_set)
3952 if (rdev->raid_disk >= 0) {
3954 sprintf(nm, "rd%d", rdev->raid_disk);
3955 sysfs_remove_link(&mddev->kobj, nm);
3958 /* make sure all md_delayed_delete calls have finished */
3959 flush_scheduled_work();
3961 export_array(mddev);
3963 mddev->array_sectors = 0;
3965 mddev->raid_disks = 0;
3966 mddev->recovery_cp = 0;
3967 mddev->resync_min = 0;
3968 mddev->resync_max = MaxSector;
3969 mddev->reshape_position = MaxSector;
3970 mddev->external = 0;
3971 mddev->persistent = 0;
3972 mddev->level = LEVEL_NONE;
3973 mddev->clevel[0] = 0;
3976 mddev->metadata_type[0] = 0;
3977 mddev->chunk_size = 0;
3978 mddev->ctime = mddev->utime = 0;
3980 mddev->max_disks = 0;
3982 mddev->delta_disks = 0;
3983 mddev->new_level = LEVEL_NONE;
3984 mddev->new_layout = 0;
3985 mddev->new_chunk = 0;
3986 mddev->curr_resync = 0;
3987 mddev->resync_mismatches = 0;
3988 mddev->suspend_lo = mddev->suspend_hi = 0;
3989 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3990 mddev->recovery = 0;
3993 mddev->degraded = 0;
3994 mddev->barriers_work = 0;
3995 mddev->safemode = 0;
3996 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
3998 } else if (mddev->pers)
3999 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4002 md_new_event(mddev);
4003 sysfs_notify_dirent(mddev->sysfs_state);
4009 static void autorun_array(mddev_t *mddev)
4014 if (list_empty(&mddev->disks))
4017 printk(KERN_INFO "md: running: ");
4019 list_for_each_entry(rdev, &mddev->disks, same_set) {
4020 char b[BDEVNAME_SIZE];
4021 printk("<%s>", bdevname(rdev->bdev,b));
4025 err = do_md_run(mddev);
4027 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4028 do_md_stop(mddev, 0, 0);
4033 * lets try to run arrays based on all disks that have arrived
4034 * until now. (those are in pending_raid_disks)
4036 * the method: pick the first pending disk, collect all disks with
4037 * the same UUID, remove all from the pending list and put them into
4038 * the 'same_array' list. Then order this list based on superblock
4039 * update time (freshest comes first), kick out 'old' disks and
4040 * compare superblocks. If everything's fine then run it.
4042 * If "unit" is allocated, then bump its reference count
4044 static void autorun_devices(int part)
4046 mdk_rdev_t *rdev0, *rdev, *tmp;
4048 char b[BDEVNAME_SIZE];
4050 printk(KERN_INFO "md: autorun ...\n");
4051 while (!list_empty(&pending_raid_disks)) {
4054 LIST_HEAD(candidates);
4055 rdev0 = list_entry(pending_raid_disks.next,
4056 mdk_rdev_t, same_set);
4058 printk(KERN_INFO "md: considering %s ...\n",
4059 bdevname(rdev0->bdev,b));
4060 INIT_LIST_HEAD(&candidates);
4061 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4062 if (super_90_load(rdev, rdev0, 0) >= 0) {
4063 printk(KERN_INFO "md: adding %s ...\n",
4064 bdevname(rdev->bdev,b));
4065 list_move(&rdev->same_set, &candidates);
4068 * now we have a set of devices, with all of them having
4069 * mostly sane superblocks. It's time to allocate the
4073 dev = MKDEV(mdp_major,
4074 rdev0->preferred_minor << MdpMinorShift);
4075 unit = MINOR(dev) >> MdpMinorShift;
4077 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4080 if (rdev0->preferred_minor != unit) {
4081 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4082 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4086 md_probe(dev, NULL, NULL);
4087 mddev = mddev_find(dev);
4088 if (!mddev || !mddev->gendisk) {
4092 "md: cannot allocate memory for md drive.\n");
4095 if (mddev_lock(mddev))
4096 printk(KERN_WARNING "md: %s locked, cannot run\n",
4098 else if (mddev->raid_disks || mddev->major_version
4099 || !list_empty(&mddev->disks)) {
4101 "md: %s already running, cannot run %s\n",
4102 mdname(mddev), bdevname(rdev0->bdev,b));
4103 mddev_unlock(mddev);
4105 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4106 mddev->persistent = 1;
4107 rdev_for_each_list(rdev, tmp, &candidates) {
4108 list_del_init(&rdev->same_set);
4109 if (bind_rdev_to_array(rdev, mddev))
4112 autorun_array(mddev);
4113 mddev_unlock(mddev);
4115 /* on success, candidates will be empty, on error
4118 rdev_for_each_list(rdev, tmp, &candidates) {
4119 list_del_init(&rdev->same_set);
4124 printk(KERN_INFO "md: ... autorun DONE.\n");
4126 #endif /* !MODULE */
4128 static int get_version(void __user * arg)
4132 ver.major = MD_MAJOR_VERSION;
4133 ver.minor = MD_MINOR_VERSION;
4134 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4136 if (copy_to_user(arg, &ver, sizeof(ver)))
4142 static int get_array_info(mddev_t * mddev, void __user * arg)
4144 mdu_array_info_t info;
4145 int nr,working,active,failed,spare;
4148 nr=working=active=failed=spare=0;
4149 list_for_each_entry(rdev, &mddev->disks, same_set) {
4151 if (test_bit(Faulty, &rdev->flags))
4155 if (test_bit(In_sync, &rdev->flags))
4162 info.major_version = mddev->major_version;
4163 info.minor_version = mddev->minor_version;
4164 info.patch_version = MD_PATCHLEVEL_VERSION;
4165 info.ctime = mddev->ctime;
4166 info.level = mddev->level;
4167 info.size = mddev->size;
4168 if (info.size != mddev->size) /* overflow */
4171 info.raid_disks = mddev->raid_disks;
4172 info.md_minor = mddev->md_minor;
4173 info.not_persistent= !mddev->persistent;
4175 info.utime = mddev->utime;
4178 info.state = (1<<MD_SB_CLEAN);
4179 if (mddev->bitmap && mddev->bitmap_offset)
4180 info.state = (1<<MD_SB_BITMAP_PRESENT);
4181 info.active_disks = active;
4182 info.working_disks = working;
4183 info.failed_disks = failed;
4184 info.spare_disks = spare;
4186 info.layout = mddev->layout;
4187 info.chunk_size = mddev->chunk_size;
4189 if (copy_to_user(arg, &info, sizeof(info)))
4195 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4197 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4198 char *ptr, *buf = NULL;
4201 if (md_allow_write(mddev))
4202 file = kmalloc(sizeof(*file), GFP_NOIO);
4204 file = kmalloc(sizeof(*file), GFP_KERNEL);
4209 /* bitmap disabled, zero the first byte and copy out */
4210 if (!mddev->bitmap || !mddev->bitmap->file) {
4211 file->pathname[0] = '\0';
4215 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4219 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4223 strcpy(file->pathname, ptr);
4227 if (copy_to_user(arg, file, sizeof(*file)))
4235 static int get_disk_info(mddev_t * mddev, void __user * arg)
4237 mdu_disk_info_t info;
4240 if (copy_from_user(&info, arg, sizeof(info)))
4243 rdev = find_rdev_nr(mddev, info.number);
4245 info.major = MAJOR(rdev->bdev->bd_dev);
4246 info.minor = MINOR(rdev->bdev->bd_dev);
4247 info.raid_disk = rdev->raid_disk;
4249 if (test_bit(Faulty, &rdev->flags))
4250 info.state |= (1<<MD_DISK_FAULTY);
4251 else if (test_bit(In_sync, &rdev->flags)) {
4252 info.state |= (1<<MD_DISK_ACTIVE);
4253 info.state |= (1<<MD_DISK_SYNC);
4255 if (test_bit(WriteMostly, &rdev->flags))
4256 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4258 info.major = info.minor = 0;
4259 info.raid_disk = -1;
4260 info.state = (1<<MD_DISK_REMOVED);
4263 if (copy_to_user(arg, &info, sizeof(info)))
4269 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4271 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4273 dev_t dev = MKDEV(info->major,info->minor);
4275 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4278 if (!mddev->raid_disks) {
4280 /* expecting a device which has a superblock */
4281 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4284 "md: md_import_device returned %ld\n",
4286 return PTR_ERR(rdev);
4288 if (!list_empty(&mddev->disks)) {
4289 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4290 mdk_rdev_t, same_set);
4291 int err = super_types[mddev->major_version]
4292 .load_super(rdev, rdev0, mddev->minor_version);
4295 "md: %s has different UUID to %s\n",
4296 bdevname(rdev->bdev,b),
4297 bdevname(rdev0->bdev,b2));
4302 err = bind_rdev_to_array(rdev, mddev);
4309 * add_new_disk can be used once the array is assembled
4310 * to add "hot spares". They must already have a superblock
4315 if (!mddev->pers->hot_add_disk) {
4317 "%s: personality does not support diskops!\n",
4321 if (mddev->persistent)
4322 rdev = md_import_device(dev, mddev->major_version,
4323 mddev->minor_version);
4325 rdev = md_import_device(dev, -1, -1);
4328 "md: md_import_device returned %ld\n",
4330 return PTR_ERR(rdev);
4332 /* set save_raid_disk if appropriate */
4333 if (!mddev->persistent) {
4334 if (info->state & (1<<MD_DISK_SYNC) &&
4335 info->raid_disk < mddev->raid_disks)
4336 rdev->raid_disk = info->raid_disk;
4338 rdev->raid_disk = -1;
4340 super_types[mddev->major_version].
4341 validate_super(mddev, rdev);
4342 rdev->saved_raid_disk = rdev->raid_disk;
4344 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4345 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4346 set_bit(WriteMostly, &rdev->flags);
4348 rdev->raid_disk = -1;
4349 err = bind_rdev_to_array(rdev, mddev);
4350 if (!err && !mddev->pers->hot_remove_disk) {
4351 /* If there is hot_add_disk but no hot_remove_disk
4352 * then added disks for geometry changes,
4353 * and should be added immediately.
4355 super_types[mddev->major_version].
4356 validate_super(mddev, rdev);
4357 err = mddev->pers->hot_add_disk(mddev, rdev);
4359 unbind_rdev_from_array(rdev);
4364 sysfs_notify_dirent(rdev->sysfs_state);
4366 md_update_sb(mddev, 1);
4367 if (mddev->degraded)
4368 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4369 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4370 md_wakeup_thread(mddev->thread);
4374 /* otherwise, add_new_disk is only allowed
4375 * for major_version==0 superblocks
4377 if (mddev->major_version != 0) {
4378 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4383 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4385 rdev = md_import_device(dev, -1, 0);
4388 "md: error, md_import_device() returned %ld\n",
4390 return PTR_ERR(rdev);
4392 rdev->desc_nr = info->number;
4393 if (info->raid_disk < mddev->raid_disks)
4394 rdev->raid_disk = info->raid_disk;
4396 rdev->raid_disk = -1;
4398 if (rdev->raid_disk < mddev->raid_disks)
4399 if (info->state & (1<<MD_DISK_SYNC))
4400 set_bit(In_sync, &rdev->flags);
4402 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4403 set_bit(WriteMostly, &rdev->flags);
4405 if (!mddev->persistent) {
4406 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4407 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4409 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4410 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4412 err = bind_rdev_to_array(rdev, mddev);
4422 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4424 char b[BDEVNAME_SIZE];
4427 rdev = find_rdev(mddev, dev);
4431 if (rdev->raid_disk >= 0)
4434 kick_rdev_from_array(rdev);
4435 md_update_sb(mddev, 1);
4436 md_new_event(mddev);
4440 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4441 bdevname(rdev->bdev,b), mdname(mddev));
4445 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4447 char b[BDEVNAME_SIZE];
4454 if (mddev->major_version != 0) {
4455 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4456 " version-0 superblocks.\n",
4460 if (!mddev->pers->hot_add_disk) {
4462 "%s: personality does not support diskops!\n",
4467 rdev = md_import_device(dev, -1, 0);
4470 "md: error, md_import_device() returned %ld\n",
4475 if (mddev->persistent)
4476 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4478 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4480 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4482 if (test_bit(Faulty, &rdev->flags)) {
4484 "md: can not hot-add faulty %s disk to %s!\n",
4485 bdevname(rdev->bdev,b), mdname(mddev));
4489 clear_bit(In_sync, &rdev->flags);
4491 rdev->saved_raid_disk = -1;
4492 err = bind_rdev_to_array(rdev, mddev);
4497 * The rest should better be atomic, we can have disk failures
4498 * noticed in interrupt contexts ...
4501 if (rdev->desc_nr == mddev->max_disks) {
4502 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4505 goto abort_unbind_export;
4508 rdev->raid_disk = -1;
4510 md_update_sb(mddev, 1);
4513 * Kick recovery, maybe this spare has to be added to the
4514 * array immediately.
4516 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4517 md_wakeup_thread(mddev->thread);
4518 md_new_event(mddev);
4521 abort_unbind_export:
4522 unbind_rdev_from_array(rdev);
4529 static int set_bitmap_file(mddev_t *mddev, int fd)
4534 if (!mddev->pers->quiesce)
4536 if (mddev->recovery || mddev->sync_thread)
4538 /* we should be able to change the bitmap.. */
4544 return -EEXIST; /* cannot add when bitmap is present */
4545 mddev->bitmap_file = fget(fd);
4547 if (mddev->bitmap_file == NULL) {
4548 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4553 err = deny_bitmap_write_access(mddev->bitmap_file);
4555 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4557 fput(mddev->bitmap_file);
4558 mddev->bitmap_file = NULL;
4561 mddev->bitmap_offset = 0; /* file overrides offset */
4562 } else if (mddev->bitmap == NULL)
4563 return -ENOENT; /* cannot remove what isn't there */
4566 mddev->pers->quiesce(mddev, 1);
4568 err = bitmap_create(mddev);
4569 if (fd < 0 || err) {
4570 bitmap_destroy(mddev);
4571 fd = -1; /* make sure to put the file */
4573 mddev->pers->quiesce(mddev, 0);
4576 if (mddev->bitmap_file) {
4577 restore_bitmap_write_access(mddev->bitmap_file);
4578 fput(mddev->bitmap_file);
4580 mddev->bitmap_file = NULL;
4587 * set_array_info is used two different ways
4588 * The original usage is when creating a new array.
4589 * In this usage, raid_disks is > 0 and it together with
4590 * level, size, not_persistent,layout,chunksize determine the
4591 * shape of the array.
4592 * This will always create an array with a type-0.90.0 superblock.
4593 * The newer usage is when assembling an array.
4594 * In this case raid_disks will be 0, and the major_version field is
4595 * use to determine which style super-blocks are to be found on the devices.
4596 * The minor and patch _version numbers are also kept incase the
4597 * super_block handler wishes to interpret them.
4599 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4602 if (info->raid_disks == 0) {
4603 /* just setting version number for superblock loading */
4604 if (info->major_version < 0 ||
4605 info->major_version >= ARRAY_SIZE(super_types) ||
4606 super_types[info->major_version].name == NULL) {
4607 /* maybe try to auto-load a module? */
4609 "md: superblock version %d not known\n",
4610 info->major_version);
4613 mddev->major_version = info->major_version;
4614 mddev->minor_version = info->minor_version;
4615 mddev->patch_version = info->patch_version;
4616 mddev->persistent = !info->not_persistent;
4619 mddev->major_version = MD_MAJOR_VERSION;
4620 mddev->minor_version = MD_MINOR_VERSION;
4621 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4622 mddev->ctime = get_seconds();
4624 mddev->level = info->level;
4625 mddev->clevel[0] = 0;
4626 mddev->size = info->size;
4627 mddev->raid_disks = info->raid_disks;
4628 /* don't set md_minor, it is determined by which /dev/md* was
4631 if (info->state & (1<<MD_SB_CLEAN))
4632 mddev->recovery_cp = MaxSector;
4634 mddev->recovery_cp = 0;
4635 mddev->persistent = ! info->not_persistent;
4636 mddev->external = 0;
4638 mddev->layout = info->layout;
4639 mddev->chunk_size = info->chunk_size;
4641 mddev->max_disks = MD_SB_DISKS;
4643 if (mddev->persistent)
4645 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4647 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4648 mddev->bitmap_offset = 0;
4650 mddev->reshape_position = MaxSector;
4653 * Generate a 128 bit UUID
4655 get_random_bytes(mddev->uuid, 16);
4657 mddev->new_level = mddev->level;
4658 mddev->new_chunk = mddev->chunk_size;
4659 mddev->new_layout = mddev->layout;
4660 mddev->delta_disks = 0;
4665 static int update_size(mddev_t *mddev, sector_t num_sectors)
4669 int fit = (num_sectors == 0);
4671 if (mddev->pers->resize == NULL)
4673 /* The "num_sectors" is the number of sectors of each device that
4674 * is used. This can only make sense for arrays with redundancy.
4675 * linear and raid0 always use whatever space is available. We can only
4676 * consider changing this number if no resync or reconstruction is
4677 * happening, and if the new size is acceptable. It must fit before the
4678 * sb_start or, if that is <data_offset, it must fit before the size
4679 * of each device. If num_sectors is zero, we find the largest size
4683 if (mddev->sync_thread)
4686 /* Sorry, cannot grow a bitmap yet, just remove it,
4690 list_for_each_entry(rdev, &mddev->disks, same_set) {
4692 avail = rdev->size * 2;
4694 if (fit && (num_sectors == 0 || num_sectors > avail))
4695 num_sectors = avail;
4696 if (avail < num_sectors)
4699 rv = mddev->pers->resize(mddev, num_sectors);
4701 struct block_device *bdev;
4703 bdev = bdget_disk(mddev->gendisk, 0);
4705 mutex_lock(&bdev->bd_inode->i_mutex);
4706 i_size_write(bdev->bd_inode,
4707 (loff_t)mddev->array_sectors << 9);
4708 mutex_unlock(&bdev->bd_inode->i_mutex);
4715 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4718 /* change the number of raid disks */
4719 if (mddev->pers->check_reshape == NULL)
4721 if (raid_disks <= 0 ||
4722 raid_disks >= mddev->max_disks)
4724 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4726 mddev->delta_disks = raid_disks - mddev->raid_disks;
4728 rv = mddev->pers->check_reshape(mddev);
4734 * update_array_info is used to change the configuration of an
4736 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4737 * fields in the info are checked against the array.
4738 * Any differences that cannot be handled will cause an error.
4739 * Normally, only one change can be managed at a time.
4741 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4747 /* calculate expected state,ignoring low bits */
4748 if (mddev->bitmap && mddev->bitmap_offset)
4749 state |= (1 << MD_SB_BITMAP_PRESENT);
4751 if (mddev->major_version != info->major_version ||
4752 mddev->minor_version != info->minor_version ||
4753 /* mddev->patch_version != info->patch_version || */
4754 mddev->ctime != info->ctime ||
4755 mddev->level != info->level ||
4756 /* mddev->layout != info->layout || */
4757 !mddev->persistent != info->not_persistent||
4758 mddev->chunk_size != info->chunk_size ||
4759 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4760 ((state^info->state) & 0xfffffe00)
4763 /* Check there is only one change */
4764 if (info->size >= 0 && mddev->size != info->size) cnt++;
4765 if (mddev->raid_disks != info->raid_disks) cnt++;
4766 if (mddev->layout != info->layout) cnt++;
4767 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4768 if (cnt == 0) return 0;
4769 if (cnt > 1) return -EINVAL;
4771 if (mddev->layout != info->layout) {
4773 * we don't need to do anything at the md level, the
4774 * personality will take care of it all.
4776 if (mddev->pers->reconfig == NULL)
4779 return mddev->pers->reconfig(mddev, info->layout, -1);
4781 if (info->size >= 0 && mddev->size != info->size)
4782 rv = update_size(mddev, (sector_t)info->size * 2);
4784 if (mddev->raid_disks != info->raid_disks)
4785 rv = update_raid_disks(mddev, info->raid_disks);
4787 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4788 if (mddev->pers->quiesce == NULL)
4790 if (mddev->recovery || mddev->sync_thread)
4792 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4793 /* add the bitmap */
4796 if (mddev->default_bitmap_offset == 0)
4798 mddev->bitmap_offset = mddev->default_bitmap_offset;
4799 mddev->pers->quiesce(mddev, 1);
4800 rv = bitmap_create(mddev);
4802 bitmap_destroy(mddev);
4803 mddev->pers->quiesce(mddev, 0);
4805 /* remove the bitmap */
4808 if (mddev->bitmap->file)
4810 mddev->pers->quiesce(mddev, 1);
4811 bitmap_destroy(mddev);
4812 mddev->pers->quiesce(mddev, 0);
4813 mddev->bitmap_offset = 0;
4816 md_update_sb(mddev, 1);
4820 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4824 if (mddev->pers == NULL)
4827 rdev = find_rdev(mddev, dev);
4831 md_error(mddev, rdev);
4836 * We have a problem here : there is no easy way to give a CHS
4837 * virtual geometry. We currently pretend that we have a 2 heads
4838 * 4 sectors (with a BIG number of cylinders...). This drives
4839 * dosfs just mad... ;-)
4841 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4843 mddev_t *mddev = bdev->bd_disk->private_data;
4847 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4851 static int md_ioctl(struct block_device *bdev, fmode_t mode,
4852 unsigned int cmd, unsigned long arg)
4855 void __user *argp = (void __user *)arg;
4856 mddev_t *mddev = NULL;
4858 if (!capable(CAP_SYS_ADMIN))
4862 * Commands dealing with the RAID driver but not any
4868 err = get_version(argp);
4871 case PRINT_RAID_DEBUG:
4879 autostart_arrays(arg);
4886 * Commands creating/starting a new array:
4889 mddev = bdev->bd_disk->private_data;
4896 err = mddev_lock(mddev);
4899 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4906 case SET_ARRAY_INFO:
4908 mdu_array_info_t info;
4910 memset(&info, 0, sizeof(info));
4911 else if (copy_from_user(&info, argp, sizeof(info))) {
4916 err = update_array_info(mddev, &info);
4918 printk(KERN_WARNING "md: couldn't update"
4919 " array info. %d\n", err);
4924 if (!list_empty(&mddev->disks)) {
4926 "md: array %s already has disks!\n",
4931 if (mddev->raid_disks) {
4933 "md: array %s already initialised!\n",
4938 err = set_array_info(mddev, &info);
4940 printk(KERN_WARNING "md: couldn't set"
4941 " array info. %d\n", err);
4951 * Commands querying/configuring an existing array:
4953 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4954 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4955 if ((!mddev->raid_disks && !mddev->external)
4956 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4957 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4958 && cmd != GET_BITMAP_FILE) {
4964 * Commands even a read-only array can execute:
4968 case GET_ARRAY_INFO:
4969 err = get_array_info(mddev, argp);
4972 case GET_BITMAP_FILE:
4973 err = get_bitmap_file(mddev, argp);
4977 err = get_disk_info(mddev, argp);
4980 case RESTART_ARRAY_RW:
4981 err = restart_array(mddev);
4985 err = do_md_stop(mddev, 0, 1);
4989 err = do_md_stop(mddev, 1, 1);
4995 * The remaining ioctls are changing the state of the
4996 * superblock, so we do not allow them on read-only arrays.
4997 * However non-MD ioctls (e.g. get-size) will still come through
4998 * here and hit the 'default' below, so only disallow
4999 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5001 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5002 if (mddev->ro == 2) {
5004 sysfs_notify_dirent(mddev->sysfs_state);
5005 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5006 md_wakeup_thread(mddev->thread);
5017 mdu_disk_info_t info;
5018 if (copy_from_user(&info, argp, sizeof(info)))
5021 err = add_new_disk(mddev, &info);
5025 case HOT_REMOVE_DISK:
5026 err = hot_remove_disk(mddev, new_decode_dev(arg));
5030 err = hot_add_disk(mddev, new_decode_dev(arg));
5033 case SET_DISK_FAULTY:
5034 err = set_disk_faulty(mddev, new_decode_dev(arg));
5038 err = do_md_run(mddev);
5041 case SET_BITMAP_FILE:
5042 err = set_bitmap_file(mddev, (int)arg);
5052 mddev_unlock(mddev);
5062 static int md_open(struct block_device *bdev, fmode_t mode)
5065 * Succeed if we can lock the mddev, which confirms that
5066 * it isn't being stopped right now.
5068 mddev_t *mddev = bdev->bd_disk->private_data;
5071 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5076 atomic_inc(&mddev->openers);
5077 mddev_unlock(mddev);
5079 check_disk_change(bdev);
5084 static int md_release(struct gendisk *disk, fmode_t mode)
5086 mddev_t *mddev = disk->private_data;
5089 atomic_dec(&mddev->openers);
5095 static int md_media_changed(struct gendisk *disk)
5097 mddev_t *mddev = disk->private_data;
5099 return mddev->changed;
5102 static int md_revalidate(struct gendisk *disk)
5104 mddev_t *mddev = disk->private_data;
5109 static struct block_device_operations md_fops =
5111 .owner = THIS_MODULE,
5113 .release = md_release,
5114 .locked_ioctl = md_ioctl,
5115 .getgeo = md_getgeo,
5116 .media_changed = md_media_changed,
5117 .revalidate_disk= md_revalidate,
5120 static int md_thread(void * arg)
5122 mdk_thread_t *thread = arg;
5125 * md_thread is a 'system-thread', it's priority should be very
5126 * high. We avoid resource deadlocks individually in each
5127 * raid personality. (RAID5 does preallocation) We also use RR and
5128 * the very same RT priority as kswapd, thus we will never get
5129 * into a priority inversion deadlock.
5131 * we definitely have to have equal or higher priority than
5132 * bdflush, otherwise bdflush will deadlock if there are too
5133 * many dirty RAID5 blocks.
5136 allow_signal(SIGKILL);
5137 while (!kthread_should_stop()) {
5139 /* We need to wait INTERRUPTIBLE so that
5140 * we don't add to the load-average.
5141 * That means we need to be sure no signals are
5144 if (signal_pending(current))
5145 flush_signals(current);
5147 wait_event_interruptible_timeout
5149 test_bit(THREAD_WAKEUP, &thread->flags)
5150 || kthread_should_stop(),
5153 clear_bit(THREAD_WAKEUP, &thread->flags);
5155 thread->run(thread->mddev);
5161 void md_wakeup_thread(mdk_thread_t *thread)
5164 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5165 set_bit(THREAD_WAKEUP, &thread->flags);
5166 wake_up(&thread->wqueue);
5170 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5173 mdk_thread_t *thread;
5175 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5179 init_waitqueue_head(&thread->wqueue);
5182 thread->mddev = mddev;
5183 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5184 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5185 if (IS_ERR(thread->tsk)) {
5192 void md_unregister_thread(mdk_thread_t *thread)
5194 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5196 kthread_stop(thread->tsk);
5200 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5207 if (!rdev || test_bit(Faulty, &rdev->flags))
5210 if (mddev->external)
5211 set_bit(Blocked, &rdev->flags);
5213 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5215 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5216 __builtin_return_address(0),__builtin_return_address(1),
5217 __builtin_return_address(2),__builtin_return_address(3));
5221 if (!mddev->pers->error_handler)
5223 mddev->pers->error_handler(mddev,rdev);
5224 if (mddev->degraded)
5225 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5226 set_bit(StateChanged, &rdev->flags);
5227 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5228 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5229 md_wakeup_thread(mddev->thread);
5230 md_new_event_inintr(mddev);
5233 /* seq_file implementation /proc/mdstat */
5235 static void status_unused(struct seq_file *seq)
5240 seq_printf(seq, "unused devices: ");
5242 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5243 char b[BDEVNAME_SIZE];
5245 seq_printf(seq, "%s ",
5246 bdevname(rdev->bdev,b));
5249 seq_printf(seq, "<none>");
5251 seq_printf(seq, "\n");
5255 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5257 sector_t max_blocks, resync, res;
5258 unsigned long dt, db, rt;
5260 unsigned int per_milli;
5262 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5264 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5265 max_blocks = mddev->resync_max_sectors >> 1;
5267 max_blocks = mddev->size;
5270 * Should not happen.
5276 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5277 * in a sector_t, and (max_blocks>>scale) will fit in a
5278 * u32, as those are the requirements for sector_div.
5279 * Thus 'scale' must be at least 10
5282 if (sizeof(sector_t) > sizeof(unsigned long)) {
5283 while ( max_blocks/2 > (1ULL<<(scale+32)))
5286 res = (resync>>scale)*1000;
5287 sector_div(res, (u32)((max_blocks>>scale)+1));
5291 int i, x = per_milli/50, y = 20-x;
5292 seq_printf(seq, "[");
5293 for (i = 0; i < x; i++)
5294 seq_printf(seq, "=");
5295 seq_printf(seq, ">");
5296 for (i = 0; i < y; i++)
5297 seq_printf(seq, ".");
5298 seq_printf(seq, "] ");
5300 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5301 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5303 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5305 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5306 "resync" : "recovery"))),
5307 per_milli/10, per_milli % 10,
5308 (unsigned long long) resync,
5309 (unsigned long long) max_blocks);
5312 * We do not want to overflow, so the order of operands and
5313 * the * 100 / 100 trick are important. We do a +1 to be
5314 * safe against division by zero. We only estimate anyway.
5316 * dt: time from mark until now
5317 * db: blocks written from mark until now
5318 * rt: remaining time
5320 dt = ((jiffies - mddev->resync_mark) / HZ);
5322 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5323 - mddev->resync_mark_cnt;
5324 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5326 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5328 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5331 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5333 struct list_head *tmp;
5343 spin_lock(&all_mddevs_lock);
5344 list_for_each(tmp,&all_mddevs)
5346 mddev = list_entry(tmp, mddev_t, all_mddevs);
5348 spin_unlock(&all_mddevs_lock);
5351 spin_unlock(&all_mddevs_lock);
5353 return (void*)2;/* tail */
5357 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5359 struct list_head *tmp;
5360 mddev_t *next_mddev, *mddev = v;
5366 spin_lock(&all_mddevs_lock);
5368 tmp = all_mddevs.next;
5370 tmp = mddev->all_mddevs.next;
5371 if (tmp != &all_mddevs)
5372 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5374 next_mddev = (void*)2;
5377 spin_unlock(&all_mddevs_lock);
5385 static void md_seq_stop(struct seq_file *seq, void *v)
5389 if (mddev && v != (void*)1 && v != (void*)2)
5393 struct mdstat_info {
5397 static int md_seq_show(struct seq_file *seq, void *v)
5402 struct mdstat_info *mi = seq->private;
5403 struct bitmap *bitmap;
5405 if (v == (void*)1) {
5406 struct mdk_personality *pers;
5407 seq_printf(seq, "Personalities : ");
5408 spin_lock(&pers_lock);
5409 list_for_each_entry(pers, &pers_list, list)
5410 seq_printf(seq, "[%s] ", pers->name);
5412 spin_unlock(&pers_lock);
5413 seq_printf(seq, "\n");
5414 mi->event = atomic_read(&md_event_count);
5417 if (v == (void*)2) {
5422 if (mddev_lock(mddev) < 0)
5425 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5426 seq_printf(seq, "%s : %sactive", mdname(mddev),
5427 mddev->pers ? "" : "in");
5430 seq_printf(seq, " (read-only)");
5432 seq_printf(seq, " (auto-read-only)");
5433 seq_printf(seq, " %s", mddev->pers->name);
5437 list_for_each_entry(rdev, &mddev->disks, same_set) {
5438 char b[BDEVNAME_SIZE];
5439 seq_printf(seq, " %s[%d]",
5440 bdevname(rdev->bdev,b), rdev->desc_nr);
5441 if (test_bit(WriteMostly, &rdev->flags))
5442 seq_printf(seq, "(W)");
5443 if (test_bit(Faulty, &rdev->flags)) {
5444 seq_printf(seq, "(F)");
5446 } else if (rdev->raid_disk < 0)
5447 seq_printf(seq, "(S)"); /* spare */
5451 if (!list_empty(&mddev->disks)) {
5453 seq_printf(seq, "\n %llu blocks",
5454 (unsigned long long)
5455 mddev->array_sectors / 2);
5457 seq_printf(seq, "\n %llu blocks",
5458 (unsigned long long)size);
5460 if (mddev->persistent) {
5461 if (mddev->major_version != 0 ||
5462 mddev->minor_version != 90) {
5463 seq_printf(seq," super %d.%d",
5464 mddev->major_version,
5465 mddev->minor_version);
5467 } else if (mddev->external)
5468 seq_printf(seq, " super external:%s",
5469 mddev->metadata_type);
5471 seq_printf(seq, " super non-persistent");
5474 mddev->pers->status(seq, mddev);
5475 seq_printf(seq, "\n ");
5476 if (mddev->pers->sync_request) {
5477 if (mddev->curr_resync > 2) {
5478 status_resync(seq, mddev);
5479 seq_printf(seq, "\n ");
5480 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5481 seq_printf(seq, "\tresync=DELAYED\n ");
5482 else if (mddev->recovery_cp < MaxSector)
5483 seq_printf(seq, "\tresync=PENDING\n ");
5486 seq_printf(seq, "\n ");
5488 if ((bitmap = mddev->bitmap)) {
5489 unsigned long chunk_kb;
5490 unsigned long flags;
5491 spin_lock_irqsave(&bitmap->lock, flags);
5492 chunk_kb = bitmap->chunksize >> 10;
5493 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5495 bitmap->pages - bitmap->missing_pages,
5497 (bitmap->pages - bitmap->missing_pages)
5498 << (PAGE_SHIFT - 10),
5499 chunk_kb ? chunk_kb : bitmap->chunksize,
5500 chunk_kb ? "KB" : "B");
5502 seq_printf(seq, ", file: ");
5503 seq_path(seq, &bitmap->file->f_path, " \t\n");
5506 seq_printf(seq, "\n");
5507 spin_unlock_irqrestore(&bitmap->lock, flags);
5510 seq_printf(seq, "\n");
5512 mddev_unlock(mddev);
5517 static struct seq_operations md_seq_ops = {
5518 .start = md_seq_start,
5519 .next = md_seq_next,
5520 .stop = md_seq_stop,
5521 .show = md_seq_show,
5524 static int md_seq_open(struct inode *inode, struct file *file)
5527 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5531 error = seq_open(file, &md_seq_ops);
5535 struct seq_file *p = file->private_data;
5537 mi->event = atomic_read(&md_event_count);
5542 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5544 struct seq_file *m = filp->private_data;
5545 struct mdstat_info *mi = m->private;
5548 poll_wait(filp, &md_event_waiters, wait);
5550 /* always allow read */
5551 mask = POLLIN | POLLRDNORM;
5553 if (mi->event != atomic_read(&md_event_count))
5554 mask |= POLLERR | POLLPRI;
5558 static const struct file_operations md_seq_fops = {
5559 .owner = THIS_MODULE,
5560 .open = md_seq_open,
5562 .llseek = seq_lseek,
5563 .release = seq_release_private,
5564 .poll = mdstat_poll,
5567 int register_md_personality(struct mdk_personality *p)
5569 spin_lock(&pers_lock);
5570 list_add_tail(&p->list, &pers_list);
5571 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5572 spin_unlock(&pers_lock);
5576 int unregister_md_personality(struct mdk_personality *p)
5578 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5579 spin_lock(&pers_lock);
5580 list_del_init(&p->list);
5581 spin_unlock(&pers_lock);
5585 static int is_mddev_idle(mddev_t *mddev)
5593 rdev_for_each_rcu(rdev, mddev) {
5594 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5595 curr_events = part_stat_read(&disk->part0, sectors[0]) +
5596 part_stat_read(&disk->part0, sectors[1]) -
5597 atomic_read(&disk->sync_io);
5598 /* sync IO will cause sync_io to increase before the disk_stats
5599 * as sync_io is counted when a request starts, and
5600 * disk_stats is counted when it completes.
5601 * So resync activity will cause curr_events to be smaller than
5602 * when there was no such activity.
5603 * non-sync IO will cause disk_stat to increase without
5604 * increasing sync_io so curr_events will (eventually)
5605 * be larger than it was before. Once it becomes
5606 * substantially larger, the test below will cause
5607 * the array to appear non-idle, and resync will slow
5609 * If there is a lot of outstanding resync activity when
5610 * we set last_event to curr_events, then all that activity
5611 * completing might cause the array to appear non-idle
5612 * and resync will be slowed down even though there might
5613 * not have been non-resync activity. This will only
5614 * happen once though. 'last_events' will soon reflect
5615 * the state where there is little or no outstanding
5616 * resync requests, and further resync activity will
5617 * always make curr_events less than last_events.
5620 if (curr_events - rdev->last_events > 4096) {
5621 rdev->last_events = curr_events;
5629 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5631 /* another "blocks" (512byte) blocks have been synced */
5632 atomic_sub(blocks, &mddev->recovery_active);
5633 wake_up(&mddev->recovery_wait);
5635 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5636 md_wakeup_thread(mddev->thread);
5637 // stop recovery, signal do_sync ....
5642 /* md_write_start(mddev, bi)
5643 * If we need to update some array metadata (e.g. 'active' flag
5644 * in superblock) before writing, schedule a superblock update
5645 * and wait for it to complete.
5647 void md_write_start(mddev_t *mddev, struct bio *bi)
5650 if (bio_data_dir(bi) != WRITE)
5653 BUG_ON(mddev->ro == 1);
5654 if (mddev->ro == 2) {
5655 /* need to switch to read/write */
5657 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5658 md_wakeup_thread(mddev->thread);
5659 md_wakeup_thread(mddev->sync_thread);
5662 atomic_inc(&mddev->writes_pending);
5663 if (mddev->safemode == 1)
5664 mddev->safemode = 0;
5665 if (mddev->in_sync) {
5666 spin_lock_irq(&mddev->write_lock);
5667 if (mddev->in_sync) {
5669 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5670 md_wakeup_thread(mddev->thread);
5673 spin_unlock_irq(&mddev->write_lock);
5676 sysfs_notify_dirent(mddev->sysfs_state);
5677 wait_event(mddev->sb_wait,
5678 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5679 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5682 void md_write_end(mddev_t *mddev)
5684 if (atomic_dec_and_test(&mddev->writes_pending)) {
5685 if (mddev->safemode == 2)
5686 md_wakeup_thread(mddev->thread);
5687 else if (mddev->safemode_delay)
5688 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5692 /* md_allow_write(mddev)
5693 * Calling this ensures that the array is marked 'active' so that writes
5694 * may proceed without blocking. It is important to call this before
5695 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5696 * Must be called with mddev_lock held.
5698 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5699 * is dropped, so return -EAGAIN after notifying userspace.
5701 int md_allow_write(mddev_t *mddev)
5707 if (!mddev->pers->sync_request)
5710 spin_lock_irq(&mddev->write_lock);
5711 if (mddev->in_sync) {
5713 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5714 if (mddev->safemode_delay &&
5715 mddev->safemode == 0)
5716 mddev->safemode = 1;
5717 spin_unlock_irq(&mddev->write_lock);
5718 md_update_sb(mddev, 0);
5719 sysfs_notify_dirent(mddev->sysfs_state);
5721 spin_unlock_irq(&mddev->write_lock);
5723 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
5728 EXPORT_SYMBOL_GPL(md_allow_write);
5730 #define SYNC_MARKS 10
5731 #define SYNC_MARK_STEP (3*HZ)
5732 void md_do_sync(mddev_t *mddev)
5735 unsigned int currspeed = 0,
5737 sector_t max_sectors,j, io_sectors;
5738 unsigned long mark[SYNC_MARKS];
5739 sector_t mark_cnt[SYNC_MARKS];
5741 struct list_head *tmp;
5742 sector_t last_check;
5747 /* just incase thread restarts... */
5748 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5750 if (mddev->ro) /* never try to sync a read-only array */
5753 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5754 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5755 desc = "data-check";
5756 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5757 desc = "requested-resync";
5760 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5765 /* we overload curr_resync somewhat here.
5766 * 0 == not engaged in resync at all
5767 * 2 == checking that there is no conflict with another sync
5768 * 1 == like 2, but have yielded to allow conflicting resync to
5770 * other == active in resync - this many blocks
5772 * Before starting a resync we must have set curr_resync to
5773 * 2, and then checked that every "conflicting" array has curr_resync
5774 * less than ours. When we find one that is the same or higher
5775 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5776 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5777 * This will mean we have to start checking from the beginning again.
5782 mddev->curr_resync = 2;
5785 if (kthread_should_stop()) {
5786 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5789 for_each_mddev(mddev2, tmp) {
5790 if (mddev2 == mddev)
5792 if (!mddev->parallel_resync
5793 && mddev2->curr_resync
5794 && match_mddev_units(mddev, mddev2)) {
5796 if (mddev < mddev2 && mddev->curr_resync == 2) {
5797 /* arbitrarily yield */
5798 mddev->curr_resync = 1;
5799 wake_up(&resync_wait);
5801 if (mddev > mddev2 && mddev->curr_resync == 1)
5802 /* no need to wait here, we can wait the next
5803 * time 'round when curr_resync == 2
5806 /* We need to wait 'interruptible' so as not to
5807 * contribute to the load average, and not to
5808 * be caught by 'softlockup'
5810 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
5811 if (!kthread_should_stop() &&
5812 mddev2->curr_resync >= mddev->curr_resync) {
5813 printk(KERN_INFO "md: delaying %s of %s"
5814 " until %s has finished (they"
5815 " share one or more physical units)\n",
5816 desc, mdname(mddev), mdname(mddev2));
5818 if (signal_pending(current))
5819 flush_signals(current);
5821 finish_wait(&resync_wait, &wq);
5824 finish_wait(&resync_wait, &wq);
5827 } while (mddev->curr_resync < 2);
5830 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5831 /* resync follows the size requested by the personality,
5832 * which defaults to physical size, but can be virtual size
5834 max_sectors = mddev->resync_max_sectors;
5835 mddev->resync_mismatches = 0;
5836 /* we don't use the checkpoint if there's a bitmap */
5837 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5838 j = mddev->resync_min;
5839 else if (!mddev->bitmap)
5840 j = mddev->recovery_cp;
5842 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5843 max_sectors = mddev->size << 1;
5845 /* recovery follows the physical size of devices */
5846 max_sectors = mddev->size << 1;
5848 list_for_each_entry(rdev, &mddev->disks, same_set)
5849 if (rdev->raid_disk >= 0 &&
5850 !test_bit(Faulty, &rdev->flags) &&
5851 !test_bit(In_sync, &rdev->flags) &&
5852 rdev->recovery_offset < j)
5853 j = rdev->recovery_offset;
5856 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5857 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5858 " %d KB/sec/disk.\n", speed_min(mddev));
5859 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5860 "(but not more than %d KB/sec) for %s.\n",
5861 speed_max(mddev), desc);
5863 is_mddev_idle(mddev); /* this also initializes IO event counters */
5866 for (m = 0; m < SYNC_MARKS; m++) {
5868 mark_cnt[m] = io_sectors;
5871 mddev->resync_mark = mark[last_mark];
5872 mddev->resync_mark_cnt = mark_cnt[last_mark];
5875 * Tune reconstruction:
5877 window = 32*(PAGE_SIZE/512);
5878 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5879 window/2,(unsigned long long) max_sectors/2);
5881 atomic_set(&mddev->recovery_active, 0);
5886 "md: resuming %s of %s from checkpoint.\n",
5887 desc, mdname(mddev));
5888 mddev->curr_resync = j;
5891 while (j < max_sectors) {
5895 if (j >= mddev->resync_max) {
5896 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5897 wait_event(mddev->recovery_wait,
5898 mddev->resync_max > j
5899 || kthread_should_stop());
5901 if (kthread_should_stop())
5903 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5904 currspeed < speed_min(mddev));
5906 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5910 if (!skipped) { /* actual IO requested */
5911 io_sectors += sectors;
5912 atomic_add(sectors, &mddev->recovery_active);
5916 if (j>1) mddev->curr_resync = j;
5917 mddev->curr_mark_cnt = io_sectors;
5918 if (last_check == 0)
5919 /* this is the earliers that rebuilt will be
5920 * visible in /proc/mdstat
5922 md_new_event(mddev);
5924 if (last_check + window > io_sectors || j == max_sectors)
5927 last_check = io_sectors;
5929 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5933 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5935 int next = (last_mark+1) % SYNC_MARKS;
5937 mddev->resync_mark = mark[next];
5938 mddev->resync_mark_cnt = mark_cnt[next];
5939 mark[next] = jiffies;
5940 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5945 if (kthread_should_stop())
5950 * this loop exits only if either when we are slower than
5951 * the 'hard' speed limit, or the system was IO-idle for
5953 * the system might be non-idle CPU-wise, but we only care
5954 * about not overloading the IO subsystem. (things like an
5955 * e2fsck being done on the RAID array should execute fast)
5957 blk_unplug(mddev->queue);
5960 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5961 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5963 if (currspeed > speed_min(mddev)) {
5964 if ((currspeed > speed_max(mddev)) ||
5965 !is_mddev_idle(mddev)) {
5971 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5973 * this also signals 'finished resyncing' to md_stop
5976 blk_unplug(mddev->queue);
5978 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5980 /* tell personality that we are finished */
5981 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5983 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5984 mddev->curr_resync > 2) {
5985 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5986 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5987 if (mddev->curr_resync >= mddev->recovery_cp) {
5989 "md: checkpointing %s of %s.\n",
5990 desc, mdname(mddev));
5991 mddev->recovery_cp = mddev->curr_resync;
5994 mddev->recovery_cp = MaxSector;
5996 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5997 mddev->curr_resync = MaxSector;
5998 list_for_each_entry(rdev, &mddev->disks, same_set)
5999 if (rdev->raid_disk >= 0 &&
6000 !test_bit(Faulty, &rdev->flags) &&
6001 !test_bit(In_sync, &rdev->flags) &&
6002 rdev->recovery_offset < mddev->curr_resync)
6003 rdev->recovery_offset = mddev->curr_resync;
6006 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6009 mddev->curr_resync = 0;
6010 mddev->resync_min = 0;
6011 mddev->resync_max = MaxSector;
6012 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6013 wake_up(&resync_wait);
6014 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6015 md_wakeup_thread(mddev->thread);
6020 * got a signal, exit.
6023 "md: md_do_sync() got signal ... exiting\n");
6024 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6028 EXPORT_SYMBOL_GPL(md_do_sync);
6031 static int remove_and_add_spares(mddev_t *mddev)
6036 list_for_each_entry(rdev, &mddev->disks, same_set)
6037 if (rdev->raid_disk >= 0 &&
6038 !test_bit(Blocked, &rdev->flags) &&
6039 (test_bit(Faulty, &rdev->flags) ||
6040 ! test_bit(In_sync, &rdev->flags)) &&
6041 atomic_read(&rdev->nr_pending)==0) {
6042 if (mddev->pers->hot_remove_disk(
6043 mddev, rdev->raid_disk)==0) {
6045 sprintf(nm,"rd%d", rdev->raid_disk);
6046 sysfs_remove_link(&mddev->kobj, nm);
6047 rdev->raid_disk = -1;
6051 if (mddev->degraded && ! mddev->ro) {
6052 list_for_each_entry(rdev, &mddev->disks, same_set) {
6053 if (rdev->raid_disk >= 0 &&
6054 !test_bit(In_sync, &rdev->flags) &&
6055 !test_bit(Blocked, &rdev->flags))
6057 if (rdev->raid_disk < 0
6058 && !test_bit(Faulty, &rdev->flags)) {
6059 rdev->recovery_offset = 0;
6061 hot_add_disk(mddev, rdev) == 0) {
6063 sprintf(nm, "rd%d", rdev->raid_disk);
6064 if (sysfs_create_link(&mddev->kobj,
6067 "md: cannot register "
6071 md_new_event(mddev);
6080 * This routine is regularly called by all per-raid-array threads to
6081 * deal with generic issues like resync and super-block update.
6082 * Raid personalities that don't have a thread (linear/raid0) do not
6083 * need this as they never do any recovery or update the superblock.
6085 * It does not do any resync itself, but rather "forks" off other threads
6086 * to do that as needed.
6087 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6088 * "->recovery" and create a thread at ->sync_thread.
6089 * When the thread finishes it sets MD_RECOVERY_DONE
6090 * and wakeups up this thread which will reap the thread and finish up.
6091 * This thread also removes any faulty devices (with nr_pending == 0).
6093 * The overall approach is:
6094 * 1/ if the superblock needs updating, update it.
6095 * 2/ If a recovery thread is running, don't do anything else.
6096 * 3/ If recovery has finished, clean up, possibly marking spares active.
6097 * 4/ If there are any faulty devices, remove them.
6098 * 5/ If array is degraded, try to add spares devices
6099 * 6/ If array has spares or is not in-sync, start a resync thread.
6101 void md_check_recovery(mddev_t *mddev)
6107 bitmap_daemon_work(mddev->bitmap);
6112 if (signal_pending(current)) {
6113 if (mddev->pers->sync_request && !mddev->external) {
6114 printk(KERN_INFO "md: %s in immediate safe mode\n",
6116 mddev->safemode = 2;
6118 flush_signals(current);
6121 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6124 (mddev->flags && !mddev->external) ||
6125 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6126 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6127 (mddev->external == 0 && mddev->safemode == 1) ||
6128 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6129 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6133 if (mddev_trylock(mddev)) {
6137 /* Only thing we do on a ro array is remove
6140 remove_and_add_spares(mddev);
6141 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6145 if (!mddev->external) {
6147 spin_lock_irq(&mddev->write_lock);
6148 if (mddev->safemode &&
6149 !atomic_read(&mddev->writes_pending) &&
6151 mddev->recovery_cp == MaxSector) {
6154 if (mddev->persistent)
6155 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6157 if (mddev->safemode == 1)
6158 mddev->safemode = 0;
6159 spin_unlock_irq(&mddev->write_lock);
6161 sysfs_notify_dirent(mddev->sysfs_state);
6165 md_update_sb(mddev, 0);
6167 list_for_each_entry(rdev, &mddev->disks, same_set)
6168 if (test_and_clear_bit(StateChanged, &rdev->flags))
6169 sysfs_notify_dirent(rdev->sysfs_state);
6172 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6173 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6174 /* resync/recovery still happening */
6175 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6178 if (mddev->sync_thread) {
6179 /* resync has finished, collect result */
6180 md_unregister_thread(mddev->sync_thread);
6181 mddev->sync_thread = NULL;
6182 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6183 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6185 /* activate any spares */
6186 if (mddev->pers->spare_active(mddev))
6187 sysfs_notify(&mddev->kobj, NULL,
6190 md_update_sb(mddev, 1);
6192 /* if array is no-longer degraded, then any saved_raid_disk
6193 * information must be scrapped
6195 if (!mddev->degraded)
6196 list_for_each_entry(rdev, &mddev->disks, same_set)
6197 rdev->saved_raid_disk = -1;
6199 mddev->recovery = 0;
6200 /* flag recovery needed just to double check */
6201 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6202 sysfs_notify_dirent(mddev->sysfs_action);
6203 md_new_event(mddev);
6206 /* Set RUNNING before clearing NEEDED to avoid
6207 * any transients in the value of "sync_action".
6209 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6210 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6211 /* Clear some bits that don't mean anything, but
6214 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6215 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6217 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6219 /* no recovery is running.
6220 * remove any failed drives, then
6221 * add spares if possible.
6222 * Spare are also removed and re-added, to allow
6223 * the personality to fail the re-add.
6226 if (mddev->reshape_position != MaxSector) {
6227 if (mddev->pers->check_reshape(mddev) != 0)
6228 /* Cannot proceed */
6230 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6231 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6232 } else if ((spares = remove_and_add_spares(mddev))) {
6233 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6234 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6235 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6236 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6237 } else if (mddev->recovery_cp < MaxSector) {
6238 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6239 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6240 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6241 /* nothing to be done ... */
6244 if (mddev->pers->sync_request) {
6245 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6246 /* We are adding a device or devices to an array
6247 * which has the bitmap stored on all devices.
6248 * So make sure all bitmap pages get written
6250 bitmap_write_all(mddev->bitmap);
6252 mddev->sync_thread = md_register_thread(md_do_sync,
6255 if (!mddev->sync_thread) {
6256 printk(KERN_ERR "%s: could not start resync"
6259 /* leave the spares where they are, it shouldn't hurt */
6260 mddev->recovery = 0;
6262 md_wakeup_thread(mddev->sync_thread);
6263 sysfs_notify_dirent(mddev->sysfs_action);
6264 md_new_event(mddev);
6267 if (!mddev->sync_thread) {
6268 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6269 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6271 if (mddev->sysfs_action)
6272 sysfs_notify_dirent(mddev->sysfs_action);
6274 mddev_unlock(mddev);
6278 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6280 sysfs_notify_dirent(rdev->sysfs_state);
6281 wait_event_timeout(rdev->blocked_wait,
6282 !test_bit(Blocked, &rdev->flags),
6283 msecs_to_jiffies(5000));
6284 rdev_dec_pending(rdev, mddev);
6286 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6288 static int md_notify_reboot(struct notifier_block *this,
6289 unsigned long code, void *x)
6291 struct list_head *tmp;
6294 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6296 printk(KERN_INFO "md: stopping all md devices.\n");
6298 for_each_mddev(mddev, tmp)
6299 if (mddev_trylock(mddev)) {
6300 /* Force a switch to readonly even array
6301 * appears to still be in use. Hence
6304 do_md_stop(mddev, 1, 100);
6305 mddev_unlock(mddev);
6308 * certain more exotic SCSI devices are known to be
6309 * volatile wrt too early system reboots. While the
6310 * right place to handle this issue is the given
6311 * driver, we do want to have a safe RAID driver ...
6318 static struct notifier_block md_notifier = {
6319 .notifier_call = md_notify_reboot,
6321 .priority = INT_MAX, /* before any real devices */
6324 static void md_geninit(void)
6326 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6328 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6331 static int __init md_init(void)
6333 if (register_blkdev(MAJOR_NR, "md"))
6335 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6336 unregister_blkdev(MAJOR_NR, "md");
6339 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6340 md_probe, NULL, NULL);
6341 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6342 md_probe, NULL, NULL);
6344 register_reboot_notifier(&md_notifier);
6345 raid_table_header = register_sysctl_table(raid_root_table);
6355 * Searches all registered partitions for autorun RAID arrays
6359 static LIST_HEAD(all_detected_devices);
6360 struct detected_devices_node {
6361 struct list_head list;
6365 void md_autodetect_dev(dev_t dev)
6367 struct detected_devices_node *node_detected_dev;
6369 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6370 if (node_detected_dev) {
6371 node_detected_dev->dev = dev;
6372 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6374 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6375 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6380 static void autostart_arrays(int part)
6383 struct detected_devices_node *node_detected_dev;
6385 int i_scanned, i_passed;
6390 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6392 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6394 node_detected_dev = list_entry(all_detected_devices.next,
6395 struct detected_devices_node, list);
6396 list_del(&node_detected_dev->list);
6397 dev = node_detected_dev->dev;
6398 kfree(node_detected_dev);
6399 rdev = md_import_device(dev,0, 90);
6403 if (test_bit(Faulty, &rdev->flags)) {
6407 set_bit(AutoDetected, &rdev->flags);
6408 list_add(&rdev->same_set, &pending_raid_disks);
6412 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6413 i_scanned, i_passed);
6415 autorun_devices(part);
6418 #endif /* !MODULE */
6420 static __exit void md_exit(void)
6423 struct list_head *tmp;
6425 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6426 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6428 unregister_blkdev(MAJOR_NR,"md");
6429 unregister_blkdev(mdp_major, "mdp");
6430 unregister_reboot_notifier(&md_notifier);
6431 unregister_sysctl_table(raid_table_header);
6432 remove_proc_entry("mdstat", NULL);
6433 for_each_mddev(mddev, tmp) {
6434 struct gendisk *disk = mddev->gendisk;
6437 export_array(mddev);
6440 mddev->gendisk = NULL;
6445 subsys_initcall(md_init);
6446 module_exit(md_exit)
6448 static int get_ro(char *buffer, struct kernel_param *kp)
6450 return sprintf(buffer, "%d", start_readonly);
6452 static int set_ro(const char *val, struct kernel_param *kp)
6455 int num = simple_strtoul(val, &e, 10);
6456 if (*val && (*e == '\0' || *e == '\n')) {
6457 start_readonly = num;
6463 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6464 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6467 EXPORT_SYMBOL(register_md_personality);
6468 EXPORT_SYMBOL(unregister_md_personality);
6469 EXPORT_SYMBOL(md_error);
6470 EXPORT_SYMBOL(md_done_sync);
6471 EXPORT_SYMBOL(md_write_start);
6472 EXPORT_SYMBOL(md_write_end);
6473 EXPORT_SYMBOL(md_register_thread);
6474 EXPORT_SYMBOL(md_unregister_thread);
6475 EXPORT_SYMBOL(md_wakeup_thread);
6476 EXPORT_SYMBOL(md_check_recovery);
6477 MODULE_LICENSE("GPL");
6479 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);