2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/buffer_head.h> /* for invalidate_bdev */
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/ctype.h>
46 #include <linux/freezer.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part);
72 static LIST_HEAD(pers_list);
73 static DEFINE_SPINLOCK(pers_lock);
75 static void md_print_devices(void);
77 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
83 * the RAID driver will use the maximum available bandwidth if the IO
84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
89 * or /sys/block/mdX/md/sync_speed_{min,max}
92 static int sysctl_speed_limit_min = 1000;
93 static int sysctl_speed_limit_max = 200000;
94 static inline int speed_min(mddev_t *mddev)
96 return mddev->sync_speed_min ?
97 mddev->sync_speed_min : sysctl_speed_limit_min;
100 static inline int speed_max(mddev_t *mddev)
102 return mddev->sync_speed_max ?
103 mddev->sync_speed_max : sysctl_speed_limit_max;
106 static struct ctl_table_header *raid_table_header;
108 static ctl_table raid_table[] = {
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
111 .procname = "speed_limit_min",
112 .data = &sysctl_speed_limit_min,
113 .maxlen = sizeof(int),
114 .mode = S_IRUGO|S_IWUSR,
115 .proc_handler = &proc_dointvec,
118 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
122 .mode = S_IRUGO|S_IWUSR,
123 .proc_handler = &proc_dointvec,
128 static ctl_table raid_dir_table[] = {
130 .ctl_name = DEV_RAID,
133 .mode = S_IRUGO|S_IXUGO,
139 static ctl_table raid_root_table[] = {
145 .child = raid_dir_table,
150 static struct block_device_operations md_fops;
152 static int start_readonly;
155 * We have a system wide 'event count' that is incremented
156 * on any 'interesting' event, and readers of /proc/mdstat
157 * can use 'poll' or 'select' to find out when the event
161 * start array, stop array, error, add device, remove device,
162 * start build, activate spare
164 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
165 static atomic_t md_event_count;
166 void md_new_event(mddev_t *mddev)
168 atomic_inc(&md_event_count);
169 wake_up(&md_event_waiters);
170 sysfs_notify(&mddev->kobj, NULL, "sync_action");
172 EXPORT_SYMBOL_GPL(md_new_event);
174 /* Alternate version that can be called from interrupts
175 * when calling sysfs_notify isn't needed.
177 static void md_new_event_inintr(mddev_t *mddev)
179 atomic_inc(&md_event_count);
180 wake_up(&md_event_waiters);
184 * Enables to iterate over all existing md arrays
185 * all_mddevs_lock protects this list.
187 static LIST_HEAD(all_mddevs);
188 static DEFINE_SPINLOCK(all_mddevs_lock);
192 * iterates through all used mddevs in the system.
193 * We take care to grab the all_mddevs_lock whenever navigating
194 * the list, and to always hold a refcount when unlocked.
195 * Any code which breaks out of this loop while own
196 * a reference to the current mddev and must mddev_put it.
198 #define ITERATE_MDDEV(mddev,tmp) \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
214 static int md_fail_request (request_queue_t *q, struct bio *bio)
216 bio_io_error(bio, bio->bi_size);
220 static inline mddev_t *mddev_get(mddev_t *mddev)
222 atomic_inc(&mddev->active);
226 static void mddev_put(mddev_t *mddev)
228 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
230 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
231 list_del(&mddev->all_mddevs);
232 spin_unlock(&all_mddevs_lock);
233 blk_cleanup_queue(mddev->queue);
234 kobject_unregister(&mddev->kobj);
236 spin_unlock(&all_mddevs_lock);
239 static mddev_t * mddev_find(dev_t unit)
241 mddev_t *mddev, *new = NULL;
244 spin_lock(&all_mddevs_lock);
245 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
246 if (mddev->unit == unit) {
248 spin_unlock(&all_mddevs_lock);
254 list_add(&new->all_mddevs, &all_mddevs);
255 spin_unlock(&all_mddevs_lock);
258 spin_unlock(&all_mddevs_lock);
260 new = kzalloc(sizeof(*new), GFP_KERNEL);
265 if (MAJOR(unit) == MD_MAJOR)
266 new->md_minor = MINOR(unit);
268 new->md_minor = MINOR(unit) >> MdpMinorShift;
270 mutex_init(&new->reconfig_mutex);
271 INIT_LIST_HEAD(&new->disks);
272 INIT_LIST_HEAD(&new->all_mddevs);
273 init_timer(&new->safemode_timer);
274 atomic_set(&new->active, 1);
275 spin_lock_init(&new->write_lock);
276 init_waitqueue_head(&new->sb_wait);
278 new->queue = blk_alloc_queue(GFP_KERNEL);
283 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
285 blk_queue_make_request(new->queue, md_fail_request);
290 static inline int mddev_lock(mddev_t * mddev)
292 return mutex_lock_interruptible(&mddev->reconfig_mutex);
295 static inline int mddev_trylock(mddev_t * mddev)
297 return mutex_trylock(&mddev->reconfig_mutex);
300 static inline void mddev_unlock(mddev_t * mddev)
302 mutex_unlock(&mddev->reconfig_mutex);
304 md_wakeup_thread(mddev->thread);
307 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
310 struct list_head *tmp;
312 ITERATE_RDEV(mddev,rdev,tmp) {
313 if (rdev->desc_nr == nr)
319 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
321 struct list_head *tmp;
324 ITERATE_RDEV(mddev,rdev,tmp) {
325 if (rdev->bdev->bd_dev == dev)
331 static struct mdk_personality *find_pers(int level, char *clevel)
333 struct mdk_personality *pers;
334 list_for_each_entry(pers, &pers_list, list) {
335 if (level != LEVEL_NONE && pers->level == level)
337 if (strcmp(pers->name, clevel)==0)
343 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
345 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
346 return MD_NEW_SIZE_BLOCKS(size);
349 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
353 size = rdev->sb_offset;
356 size &= ~((sector_t)chunk_size/1024 - 1);
360 static int alloc_disk_sb(mdk_rdev_t * rdev)
365 rdev->sb_page = alloc_page(GFP_KERNEL);
366 if (!rdev->sb_page) {
367 printk(KERN_ALERT "md: out of memory.\n");
374 static void free_disk_sb(mdk_rdev_t * rdev)
377 put_page(rdev->sb_page);
379 rdev->sb_page = NULL;
386 static int super_written(struct bio *bio, unsigned int bytes_done, int error)
388 mdk_rdev_t *rdev = bio->bi_private;
389 mddev_t *mddev = rdev->mddev;
393 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
394 printk("md: super_written gets error=%d, uptodate=%d\n",
395 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
396 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
397 md_error(mddev, rdev);
400 if (atomic_dec_and_test(&mddev->pending_writes))
401 wake_up(&mddev->sb_wait);
406 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
408 struct bio *bio2 = bio->bi_private;
409 mdk_rdev_t *rdev = bio2->bi_private;
410 mddev_t *mddev = rdev->mddev;
414 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
415 error == -EOPNOTSUPP) {
417 /* barriers don't appear to be supported :-( */
418 set_bit(BarriersNotsupp, &rdev->flags);
419 mddev->barriers_work = 0;
420 spin_lock_irqsave(&mddev->write_lock, flags);
421 bio2->bi_next = mddev->biolist;
422 mddev->biolist = bio2;
423 spin_unlock_irqrestore(&mddev->write_lock, flags);
424 wake_up(&mddev->sb_wait);
429 bio->bi_private = rdev;
430 return super_written(bio, bytes_done, error);
433 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
434 sector_t sector, int size, struct page *page)
436 /* write first size bytes of page to sector of rdev
437 * Increment mddev->pending_writes before returning
438 * and decrement it on completion, waking up sb_wait
439 * if zero is reached.
440 * If an error occurred, call md_error
442 * As we might need to resubmit the request if BIO_RW_BARRIER
443 * causes ENOTSUPP, we allocate a spare bio...
445 struct bio *bio = bio_alloc(GFP_NOIO, 1);
446 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
448 bio->bi_bdev = rdev->bdev;
449 bio->bi_sector = sector;
450 bio_add_page(bio, page, size, 0);
451 bio->bi_private = rdev;
452 bio->bi_end_io = super_written;
455 atomic_inc(&mddev->pending_writes);
456 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
458 rw |= (1<<BIO_RW_BARRIER);
459 rbio = bio_clone(bio, GFP_NOIO);
460 rbio->bi_private = bio;
461 rbio->bi_end_io = super_written_barrier;
462 submit_bio(rw, rbio);
467 void md_super_wait(mddev_t *mddev)
469 /* wait for all superblock writes that were scheduled to complete.
470 * if any had to be retried (due to BARRIER problems), retry them
474 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
475 if (atomic_read(&mddev->pending_writes)==0)
477 while (mddev->biolist) {
479 spin_lock_irq(&mddev->write_lock);
480 bio = mddev->biolist;
481 mddev->biolist = bio->bi_next ;
483 spin_unlock_irq(&mddev->write_lock);
484 submit_bio(bio->bi_rw, bio);
488 finish_wait(&mddev->sb_wait, &wq);
491 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
496 complete((struct completion*)bio->bi_private);
500 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
501 struct page *page, int rw)
503 struct bio *bio = bio_alloc(GFP_NOIO, 1);
504 struct completion event;
507 rw |= (1 << BIO_RW_SYNC);
510 bio->bi_sector = sector;
511 bio_add_page(bio, page, size, 0);
512 init_completion(&event);
513 bio->bi_private = &event;
514 bio->bi_end_io = bi_complete;
516 wait_for_completion(&event);
518 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
522 EXPORT_SYMBOL_GPL(sync_page_io);
524 static int read_disk_sb(mdk_rdev_t * rdev, int size)
526 char b[BDEVNAME_SIZE];
527 if (!rdev->sb_page) {
535 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
541 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
542 bdevname(rdev->bdev,b));
546 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
548 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
549 (sb1->set_uuid1 == sb2->set_uuid1) &&
550 (sb1->set_uuid2 == sb2->set_uuid2) &&
551 (sb1->set_uuid3 == sb2->set_uuid3))
559 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
562 mdp_super_t *tmp1, *tmp2;
564 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
565 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
567 if (!tmp1 || !tmp2) {
569 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
577 * nr_disks is not constant
582 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
593 static unsigned int calc_sb_csum(mdp_super_t * sb)
595 unsigned int disk_csum, csum;
597 disk_csum = sb->sb_csum;
599 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
600 sb->sb_csum = disk_csum;
606 * Handle superblock details.
607 * We want to be able to handle multiple superblock formats
608 * so we have a common interface to them all, and an array of
609 * different handlers.
610 * We rely on user-space to write the initial superblock, and support
611 * reading and updating of superblocks.
612 * Interface methods are:
613 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
614 * loads and validates a superblock on dev.
615 * if refdev != NULL, compare superblocks on both devices
617 * 0 - dev has a superblock that is compatible with refdev
618 * 1 - dev has a superblock that is compatible and newer than refdev
619 * so dev should be used as the refdev in future
620 * -EINVAL superblock incompatible or invalid
621 * -othererror e.g. -EIO
623 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
624 * Verify that dev is acceptable into mddev.
625 * The first time, mddev->raid_disks will be 0, and data from
626 * dev should be merged in. Subsequent calls check that dev
627 * is new enough. Return 0 or -EINVAL
629 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
630 * Update the superblock for rdev with data in mddev
631 * This does not write to disc.
637 struct module *owner;
638 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
639 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
640 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
644 * load_super for 0.90.0
646 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
648 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
654 * Calculate the position of the superblock,
655 * it's at the end of the disk.
657 * It also happens to be a multiple of 4Kb.
659 sb_offset = calc_dev_sboffset(rdev->bdev);
660 rdev->sb_offset = sb_offset;
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 (csum_fold(calc_sb_csum(sb)) != 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_dev_size(rdev, sb->chunk_size);
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;
758 if (mddev->raid_disks == 0) {
759 mddev->major_version = 0;
760 mddev->minor_version = sb->minor_version;
761 mddev->patch_version = sb->patch_version;
762 mddev->persistent = ! sb->not_persistent;
763 mddev->chunk_size = sb->chunk_size;
764 mddev->ctime = sb->ctime;
765 mddev->utime = sb->utime;
766 mddev->level = sb->level;
767 mddev->clevel[0] = 0;
768 mddev->layout = sb->layout;
769 mddev->raid_disks = sb->raid_disks;
770 mddev->size = sb->size;
772 mddev->bitmap_offset = 0;
773 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
775 if (mddev->minor_version >= 91) {
776 mddev->reshape_position = sb->reshape_position;
777 mddev->delta_disks = sb->delta_disks;
778 mddev->new_level = sb->new_level;
779 mddev->new_layout = sb->new_layout;
780 mddev->new_chunk = sb->new_chunk;
782 mddev->reshape_position = MaxSector;
783 mddev->delta_disks = 0;
784 mddev->new_level = mddev->level;
785 mddev->new_layout = mddev->layout;
786 mddev->new_chunk = mddev->chunk_size;
789 if (sb->state & (1<<MD_SB_CLEAN))
790 mddev->recovery_cp = MaxSector;
792 if (sb->events_hi == sb->cp_events_hi &&
793 sb->events_lo == sb->cp_events_lo) {
794 mddev->recovery_cp = sb->recovery_cp;
796 mddev->recovery_cp = 0;
799 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
800 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
801 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
802 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
804 mddev->max_disks = MD_SB_DISKS;
806 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
807 mddev->bitmap_file == NULL)
808 mddev->bitmap_offset = mddev->default_bitmap_offset;
810 } else if (mddev->pers == NULL) {
811 /* Insist on good event counter while assembling */
813 if (ev1 < mddev->events)
815 } else if (mddev->bitmap) {
816 /* if adding to array with a bitmap, then we can accept an
817 * older device ... but not too old.
819 if (ev1 < mddev->bitmap->events_cleared)
822 if (ev1 < mddev->events)
823 /* just a hot-add of a new device, leave raid_disk at -1 */
827 if (mddev->level != LEVEL_MULTIPATH) {
828 desc = sb->disks + rdev->desc_nr;
830 if (desc->state & (1<<MD_DISK_FAULTY))
831 set_bit(Faulty, &rdev->flags);
832 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
833 desc->raid_disk < mddev->raid_disks */) {
834 set_bit(In_sync, &rdev->flags);
835 rdev->raid_disk = desc->raid_disk;
837 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
838 set_bit(WriteMostly, &rdev->flags);
839 } else /* MULTIPATH are always insync */
840 set_bit(In_sync, &rdev->flags);
845 * sync_super for 0.90.0
847 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
850 struct list_head *tmp;
852 int next_spare = mddev->raid_disks;
855 /* make rdev->sb match mddev data..
858 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
859 * 3/ any empty disks < next_spare become removed
861 * disks[0] gets initialised to REMOVED because
862 * we cannot be sure from other fields if it has
863 * been initialised or not.
866 int active=0, working=0,failed=0,spare=0,nr_disks=0;
868 rdev->sb_size = MD_SB_BYTES;
870 sb = (mdp_super_t*)page_address(rdev->sb_page);
872 memset(sb, 0, sizeof(*sb));
874 sb->md_magic = MD_SB_MAGIC;
875 sb->major_version = mddev->major_version;
876 sb->patch_version = mddev->patch_version;
877 sb->gvalid_words = 0; /* ignored */
878 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
879 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
880 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
881 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
883 sb->ctime = mddev->ctime;
884 sb->level = mddev->level;
885 sb->size = mddev->size;
886 sb->raid_disks = mddev->raid_disks;
887 sb->md_minor = mddev->md_minor;
888 sb->not_persistent = !mddev->persistent;
889 sb->utime = mddev->utime;
891 sb->events_hi = (mddev->events>>32);
892 sb->events_lo = (u32)mddev->events;
894 if (mddev->reshape_position == MaxSector)
895 sb->minor_version = 90;
897 sb->minor_version = 91;
898 sb->reshape_position = mddev->reshape_position;
899 sb->new_level = mddev->new_level;
900 sb->delta_disks = mddev->delta_disks;
901 sb->new_layout = mddev->new_layout;
902 sb->new_chunk = mddev->new_chunk;
904 mddev->minor_version = sb->minor_version;
907 sb->recovery_cp = mddev->recovery_cp;
908 sb->cp_events_hi = (mddev->events>>32);
909 sb->cp_events_lo = (u32)mddev->events;
910 if (mddev->recovery_cp == MaxSector)
911 sb->state = (1<< MD_SB_CLEAN);
915 sb->layout = mddev->layout;
916 sb->chunk_size = mddev->chunk_size;
918 if (mddev->bitmap && mddev->bitmap_file == NULL)
919 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
921 sb->disks[0].state = (1<<MD_DISK_REMOVED);
922 ITERATE_RDEV(mddev,rdev2,tmp) {
925 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
926 && !test_bit(Faulty, &rdev2->flags))
927 desc_nr = rdev2->raid_disk;
929 desc_nr = next_spare++;
930 rdev2->desc_nr = desc_nr;
931 d = &sb->disks[rdev2->desc_nr];
933 d->number = rdev2->desc_nr;
934 d->major = MAJOR(rdev2->bdev->bd_dev);
935 d->minor = MINOR(rdev2->bdev->bd_dev);
936 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
937 && !test_bit(Faulty, &rdev2->flags))
938 d->raid_disk = rdev2->raid_disk;
940 d->raid_disk = rdev2->desc_nr; /* compatibility */
941 if (test_bit(Faulty, &rdev2->flags))
942 d->state = (1<<MD_DISK_FAULTY);
943 else if (test_bit(In_sync, &rdev2->flags)) {
944 d->state = (1<<MD_DISK_ACTIVE);
945 d->state |= (1<<MD_DISK_SYNC);
953 if (test_bit(WriteMostly, &rdev2->flags))
954 d->state |= (1<<MD_DISK_WRITEMOSTLY);
956 /* now set the "removed" and "faulty" bits on any missing devices */
957 for (i=0 ; i < mddev->raid_disks ; i++) {
958 mdp_disk_t *d = &sb->disks[i];
959 if (d->state == 0 && d->number == 0) {
962 d->state = (1<<MD_DISK_REMOVED);
963 d->state |= (1<<MD_DISK_FAULTY);
967 sb->nr_disks = nr_disks;
968 sb->active_disks = active;
969 sb->working_disks = working;
970 sb->failed_disks = failed;
971 sb->spare_disks = spare;
973 sb->this_disk = sb->disks[rdev->desc_nr];
974 sb->sb_csum = calc_sb_csum(sb);
978 * version 1 superblock
981 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
985 unsigned long long newcsum;
986 int size = 256 + le32_to_cpu(sb->max_dev)*2;
987 __le32 *isuper = (__le32*)sb;
990 disk_csum = sb->sb_csum;
993 for (i=0; size>=4; size -= 4 )
994 newcsum += le32_to_cpu(*isuper++);
997 newcsum += le16_to_cpu(*(__le16*) isuper);
999 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1000 sb->sb_csum = disk_csum;
1001 return cpu_to_le32(csum);
1004 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1006 struct mdp_superblock_1 *sb;
1009 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1013 * Calculate the position of the superblock.
1014 * It is always aligned to a 4K boundary and
1015 * depeding on minor_version, it can be:
1016 * 0: At least 8K, but less than 12K, from end of device
1017 * 1: At start of device
1018 * 2: 4K from start of device.
1020 switch(minor_version) {
1022 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1024 sb_offset &= ~(sector_t)(4*2-1);
1025 /* convert from sectors to K */
1037 rdev->sb_offset = sb_offset;
1039 /* superblock is rarely larger than 1K, but it can be larger,
1040 * and it is safe to read 4k, so we do that
1042 ret = read_disk_sb(rdev, 4096);
1043 if (ret) return ret;
1046 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1048 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1049 sb->major_version != cpu_to_le32(1) ||
1050 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1051 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1052 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1055 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1056 printk("md: invalid superblock checksum on %s\n",
1057 bdevname(rdev->bdev,b));
1060 if (le64_to_cpu(sb->data_size) < 10) {
1061 printk("md: data_size too small on %s\n",
1062 bdevname(rdev->bdev,b));
1065 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1066 if (sb->level != cpu_to_le32(1) &&
1067 sb->level != cpu_to_le32(4) &&
1068 sb->level != cpu_to_le32(5) &&
1069 sb->level != cpu_to_le32(6) &&
1070 sb->level != cpu_to_le32(10)) {
1072 "md: bitmaps not supported for this level.\n");
1077 rdev->preferred_minor = 0xffff;
1078 rdev->data_offset = le64_to_cpu(sb->data_offset);
1079 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1081 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1082 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1083 if (rdev->sb_size & bmask)
1084 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1086 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1089 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1095 struct mdp_superblock_1 *refsb =
1096 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1098 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1099 sb->level != refsb->level ||
1100 sb->layout != refsb->layout ||
1101 sb->chunksize != refsb->chunksize) {
1102 printk(KERN_WARNING "md: %s has strangely different"
1103 " superblock to %s\n",
1104 bdevname(rdev->bdev,b),
1105 bdevname(refdev->bdev,b2));
1108 ev1 = le64_to_cpu(sb->events);
1109 ev2 = le64_to_cpu(refsb->events);
1117 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1119 rdev->size = rdev->sb_offset;
1120 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1122 rdev->size = le64_to_cpu(sb->data_size)/2;
1123 if (le32_to_cpu(sb->chunksize))
1124 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1126 if (le64_to_cpu(sb->size) > rdev->size*2)
1131 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1133 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1134 __u64 ev1 = le64_to_cpu(sb->events);
1136 rdev->raid_disk = -1;
1138 if (mddev->raid_disks == 0) {
1139 mddev->major_version = 1;
1140 mddev->patch_version = 0;
1141 mddev->persistent = 1;
1142 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1143 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1144 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1145 mddev->level = le32_to_cpu(sb->level);
1146 mddev->clevel[0] = 0;
1147 mddev->layout = le32_to_cpu(sb->layout);
1148 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1149 mddev->size = le64_to_cpu(sb->size)/2;
1150 mddev->events = ev1;
1151 mddev->bitmap_offset = 0;
1152 mddev->default_bitmap_offset = 1024 >> 9;
1154 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1155 memcpy(mddev->uuid, sb->set_uuid, 16);
1157 mddev->max_disks = (4096-256)/2;
1159 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1160 mddev->bitmap_file == NULL )
1161 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1163 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1164 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1165 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1166 mddev->new_level = le32_to_cpu(sb->new_level);
1167 mddev->new_layout = le32_to_cpu(sb->new_layout);
1168 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1170 mddev->reshape_position = MaxSector;
1171 mddev->delta_disks = 0;
1172 mddev->new_level = mddev->level;
1173 mddev->new_layout = mddev->layout;
1174 mddev->new_chunk = mddev->chunk_size;
1177 } else if (mddev->pers == NULL) {
1178 /* Insist of good event counter while assembling */
1180 if (ev1 < mddev->events)
1182 } else if (mddev->bitmap) {
1183 /* If adding to array with a bitmap, then we can accept an
1184 * older device, but not too old.
1186 if (ev1 < mddev->bitmap->events_cleared)
1189 if (ev1 < mddev->events)
1190 /* just a hot-add of a new device, leave raid_disk at -1 */
1193 if (mddev->level != LEVEL_MULTIPATH) {
1195 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1197 case 0xffff: /* spare */
1199 case 0xfffe: /* faulty */
1200 set_bit(Faulty, &rdev->flags);
1203 if ((le32_to_cpu(sb->feature_map) &
1204 MD_FEATURE_RECOVERY_OFFSET))
1205 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1207 set_bit(In_sync, &rdev->flags);
1208 rdev->raid_disk = role;
1211 if (sb->devflags & WriteMostly1)
1212 set_bit(WriteMostly, &rdev->flags);
1213 } else /* MULTIPATH are always insync */
1214 set_bit(In_sync, &rdev->flags);
1219 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1221 struct mdp_superblock_1 *sb;
1222 struct list_head *tmp;
1225 /* make rdev->sb match mddev and rdev data. */
1227 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1229 sb->feature_map = 0;
1231 sb->recovery_offset = cpu_to_le64(0);
1232 memset(sb->pad1, 0, sizeof(sb->pad1));
1233 memset(sb->pad2, 0, sizeof(sb->pad2));
1234 memset(sb->pad3, 0, sizeof(sb->pad3));
1236 sb->utime = cpu_to_le64((__u64)mddev->utime);
1237 sb->events = cpu_to_le64(mddev->events);
1239 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1241 sb->resync_offset = cpu_to_le64(0);
1243 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1245 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1246 sb->size = cpu_to_le64(mddev->size<<1);
1248 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1249 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1250 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1253 if (rdev->raid_disk >= 0 &&
1254 !test_bit(In_sync, &rdev->flags) &&
1255 rdev->recovery_offset > 0) {
1256 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1257 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1260 if (mddev->reshape_position != MaxSector) {
1261 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1262 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1263 sb->new_layout = cpu_to_le32(mddev->new_layout);
1264 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1265 sb->new_level = cpu_to_le32(mddev->new_level);
1266 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1270 ITERATE_RDEV(mddev,rdev2,tmp)
1271 if (rdev2->desc_nr+1 > max_dev)
1272 max_dev = rdev2->desc_nr+1;
1274 sb->max_dev = cpu_to_le32(max_dev);
1275 for (i=0; i<max_dev;i++)
1276 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1278 ITERATE_RDEV(mddev,rdev2,tmp) {
1280 if (test_bit(Faulty, &rdev2->flags))
1281 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1282 else if (test_bit(In_sync, &rdev2->flags))
1283 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1284 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1285 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1287 sb->dev_roles[i] = cpu_to_le16(0xffff);
1290 sb->sb_csum = calc_sb_1_csum(sb);
1294 static struct super_type super_types[] = {
1297 .owner = THIS_MODULE,
1298 .load_super = super_90_load,
1299 .validate_super = super_90_validate,
1300 .sync_super = super_90_sync,
1304 .owner = THIS_MODULE,
1305 .load_super = super_1_load,
1306 .validate_super = super_1_validate,
1307 .sync_super = super_1_sync,
1311 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1313 struct list_head *tmp, *tmp2;
1314 mdk_rdev_t *rdev, *rdev2;
1316 ITERATE_RDEV(mddev1,rdev,tmp)
1317 ITERATE_RDEV(mddev2, rdev2, tmp2)
1318 if (rdev->bdev->bd_contains ==
1319 rdev2->bdev->bd_contains)
1325 static LIST_HEAD(pending_raid_disks);
1327 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1329 char b[BDEVNAME_SIZE];
1338 /* make sure rdev->size exceeds mddev->size */
1339 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1341 /* Cannot change size, so fail */
1344 mddev->size = rdev->size;
1347 /* Verify rdev->desc_nr is unique.
1348 * If it is -1, assign a free number, else
1349 * check number is not in use
1351 if (rdev->desc_nr < 0) {
1353 if (mddev->pers) choice = mddev->raid_disks;
1354 while (find_rdev_nr(mddev, choice))
1356 rdev->desc_nr = choice;
1358 if (find_rdev_nr(mddev, rdev->desc_nr))
1361 bdevname(rdev->bdev,b);
1362 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1364 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1367 rdev->mddev = mddev;
1368 printk(KERN_INFO "md: bind<%s>\n", b);
1370 rdev->kobj.parent = &mddev->kobj;
1371 if ((err = kobject_add(&rdev->kobj)))
1374 if (rdev->bdev->bd_part)
1375 ko = &rdev->bdev->bd_part->kobj;
1377 ko = &rdev->bdev->bd_disk->kobj;
1378 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1379 kobject_del(&rdev->kobj);
1382 list_add(&rdev->same_set, &mddev->disks);
1383 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1387 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1392 static void delayed_delete(struct work_struct *ws)
1394 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1395 kobject_del(&rdev->kobj);
1398 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1400 char b[BDEVNAME_SIZE];
1405 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1406 list_del_init(&rdev->same_set);
1407 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1409 sysfs_remove_link(&rdev->kobj, "block");
1411 /* We need to delay this, otherwise we can deadlock when
1412 * writing to 'remove' to "dev/state"
1414 INIT_WORK(&rdev->del_work, delayed_delete);
1415 schedule_work(&rdev->del_work);
1419 * prevent the device from being mounted, repartitioned or
1420 * otherwise reused by a RAID array (or any other kernel
1421 * subsystem), by bd_claiming the device.
1423 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1426 struct block_device *bdev;
1427 char b[BDEVNAME_SIZE];
1429 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1431 printk(KERN_ERR "md: could not open %s.\n",
1432 __bdevname(dev, b));
1433 return PTR_ERR(bdev);
1435 err = bd_claim(bdev, rdev);
1437 printk(KERN_ERR "md: could not bd_claim %s.\n",
1446 static void unlock_rdev(mdk_rdev_t *rdev)
1448 struct block_device *bdev = rdev->bdev;
1456 void md_autodetect_dev(dev_t dev);
1458 static void export_rdev(mdk_rdev_t * rdev)
1460 char b[BDEVNAME_SIZE];
1461 printk(KERN_INFO "md: export_rdev(%s)\n",
1462 bdevname(rdev->bdev,b));
1466 list_del_init(&rdev->same_set);
1468 md_autodetect_dev(rdev->bdev->bd_dev);
1471 kobject_put(&rdev->kobj);
1474 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1476 unbind_rdev_from_array(rdev);
1480 static void export_array(mddev_t *mddev)
1482 struct list_head *tmp;
1485 ITERATE_RDEV(mddev,rdev,tmp) {
1490 kick_rdev_from_array(rdev);
1492 if (!list_empty(&mddev->disks))
1494 mddev->raid_disks = 0;
1495 mddev->major_version = 0;
1498 static void print_desc(mdp_disk_t *desc)
1500 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1501 desc->major,desc->minor,desc->raid_disk,desc->state);
1504 static void print_sb(mdp_super_t *sb)
1509 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1510 sb->major_version, sb->minor_version, sb->patch_version,
1511 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1513 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1514 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1515 sb->md_minor, sb->layout, sb->chunk_size);
1516 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1517 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1518 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1519 sb->failed_disks, sb->spare_disks,
1520 sb->sb_csum, (unsigned long)sb->events_lo);
1523 for (i = 0; i < MD_SB_DISKS; i++) {
1526 desc = sb->disks + i;
1527 if (desc->number || desc->major || desc->minor ||
1528 desc->raid_disk || (desc->state && (desc->state != 4))) {
1529 printk(" D %2d: ", i);
1533 printk(KERN_INFO "md: THIS: ");
1534 print_desc(&sb->this_disk);
1538 static void print_rdev(mdk_rdev_t *rdev)
1540 char b[BDEVNAME_SIZE];
1541 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1542 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1543 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1545 if (rdev->sb_loaded) {
1546 printk(KERN_INFO "md: rdev superblock:\n");
1547 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1549 printk(KERN_INFO "md: no rdev superblock!\n");
1552 static void md_print_devices(void)
1554 struct list_head *tmp, *tmp2;
1557 char b[BDEVNAME_SIZE];
1560 printk("md: **********************************\n");
1561 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1562 printk("md: **********************************\n");
1563 ITERATE_MDDEV(mddev,tmp) {
1566 bitmap_print_sb(mddev->bitmap);
1568 printk("%s: ", mdname(mddev));
1569 ITERATE_RDEV(mddev,rdev,tmp2)
1570 printk("<%s>", bdevname(rdev->bdev,b));
1573 ITERATE_RDEV(mddev,rdev,tmp2)
1576 printk("md: **********************************\n");
1581 static void sync_sbs(mddev_t * mddev, int nospares)
1583 /* Update each superblock (in-memory image), but
1584 * if we are allowed to, skip spares which already
1585 * have the right event counter, or have one earlier
1586 * (which would mean they aren't being marked as dirty
1587 * with the rest of the array)
1590 struct list_head *tmp;
1592 ITERATE_RDEV(mddev,rdev,tmp) {
1593 if (rdev->sb_events == mddev->events ||
1595 rdev->raid_disk < 0 &&
1596 (rdev->sb_events&1)==0 &&
1597 rdev->sb_events+1 == mddev->events)) {
1598 /* Don't update this superblock */
1599 rdev->sb_loaded = 2;
1601 super_types[mddev->major_version].
1602 sync_super(mddev, rdev);
1603 rdev->sb_loaded = 1;
1608 static void md_update_sb(mddev_t * mddev, int force_change)
1611 struct list_head *tmp;
1617 spin_lock_irq(&mddev->write_lock);
1619 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1620 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1622 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1623 /* just a clean<-> dirty transition, possibly leave spares alone,
1624 * though if events isn't the right even/odd, we will have to do
1630 if (mddev->degraded)
1631 /* If the array is degraded, then skipping spares is both
1632 * dangerous and fairly pointless.
1633 * Dangerous because a device that was removed from the array
1634 * might have a event_count that still looks up-to-date,
1635 * so it can be re-added without a resync.
1636 * Pointless because if there are any spares to skip,
1637 * then a recovery will happen and soon that array won't
1638 * be degraded any more and the spare can go back to sleep then.
1642 sync_req = mddev->in_sync;
1643 mddev->utime = get_seconds();
1645 /* If this is just a dirty<->clean transition, and the array is clean
1646 * and 'events' is odd, we can roll back to the previous clean state */
1648 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1649 && (mddev->events & 1)
1650 && mddev->events != 1)
1653 /* otherwise we have to go forward and ... */
1655 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1656 /* .. if the array isn't clean, insist on an odd 'events' */
1657 if ((mddev->events&1)==0) {
1662 /* otherwise insist on an even 'events' (for clean states) */
1663 if ((mddev->events&1)) {
1670 if (!mddev->events) {
1672 * oops, this 64-bit counter should never wrap.
1673 * Either we are in around ~1 trillion A.C., assuming
1674 * 1 reboot per second, or we have a bug:
1679 sync_sbs(mddev, nospares);
1682 * do not write anything to disk if using
1683 * nonpersistent superblocks
1685 if (!mddev->persistent) {
1686 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1687 spin_unlock_irq(&mddev->write_lock);
1688 wake_up(&mddev->sb_wait);
1691 spin_unlock_irq(&mddev->write_lock);
1694 "md: updating %s RAID superblock on device (in sync %d)\n",
1695 mdname(mddev),mddev->in_sync);
1697 err = bitmap_update_sb(mddev->bitmap);
1698 ITERATE_RDEV(mddev,rdev,tmp) {
1699 char b[BDEVNAME_SIZE];
1700 dprintk(KERN_INFO "md: ");
1701 if (rdev->sb_loaded != 1)
1702 continue; /* no noise on spare devices */
1703 if (test_bit(Faulty, &rdev->flags))
1704 dprintk("(skipping faulty ");
1706 dprintk("%s ", bdevname(rdev->bdev,b));
1707 if (!test_bit(Faulty, &rdev->flags)) {
1708 md_super_write(mddev,rdev,
1709 rdev->sb_offset<<1, rdev->sb_size,
1711 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1712 bdevname(rdev->bdev,b),
1713 (unsigned long long)rdev->sb_offset);
1714 rdev->sb_events = mddev->events;
1718 if (mddev->level == LEVEL_MULTIPATH)
1719 /* only need to write one superblock... */
1722 md_super_wait(mddev);
1723 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1725 spin_lock_irq(&mddev->write_lock);
1726 if (mddev->in_sync != sync_req ||
1727 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1728 /* have to write it out again */
1729 spin_unlock_irq(&mddev->write_lock);
1732 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1733 spin_unlock_irq(&mddev->write_lock);
1734 wake_up(&mddev->sb_wait);
1738 /* words written to sysfs files may, or my not, be \n terminated.
1739 * We want to accept with case. For this we use cmd_match.
1741 static int cmd_match(const char *cmd, const char *str)
1743 /* See if cmd, written into a sysfs file, matches
1744 * str. They must either be the same, or cmd can
1745 * have a trailing newline
1747 while (*cmd && *str && *cmd == *str) {
1758 struct rdev_sysfs_entry {
1759 struct attribute attr;
1760 ssize_t (*show)(mdk_rdev_t *, char *);
1761 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1765 state_show(mdk_rdev_t *rdev, char *page)
1770 if (test_bit(Faulty, &rdev->flags)) {
1771 len+= sprintf(page+len, "%sfaulty",sep);
1774 if (test_bit(In_sync, &rdev->flags)) {
1775 len += sprintf(page+len, "%sin_sync",sep);
1778 if (test_bit(WriteMostly, &rdev->flags)) {
1779 len += sprintf(page+len, "%swrite_mostly",sep);
1782 if (!test_bit(Faulty, &rdev->flags) &&
1783 !test_bit(In_sync, &rdev->flags)) {
1784 len += sprintf(page+len, "%sspare", sep);
1787 return len+sprintf(page+len, "\n");
1791 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1794 * faulty - simulates and error
1795 * remove - disconnects the device
1796 * writemostly - sets write_mostly
1797 * -writemostly - clears write_mostly
1800 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1801 md_error(rdev->mddev, rdev);
1803 } else if (cmd_match(buf, "remove")) {
1804 if (rdev->raid_disk >= 0)
1807 mddev_t *mddev = rdev->mddev;
1808 kick_rdev_from_array(rdev);
1810 md_update_sb(mddev, 1);
1811 md_new_event(mddev);
1814 } else if (cmd_match(buf, "writemostly")) {
1815 set_bit(WriteMostly, &rdev->flags);
1817 } else if (cmd_match(buf, "-writemostly")) {
1818 clear_bit(WriteMostly, &rdev->flags);
1821 return err ? err : len;
1823 static struct rdev_sysfs_entry rdev_state =
1824 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1827 super_show(mdk_rdev_t *rdev, char *page)
1829 if (rdev->sb_loaded && rdev->sb_size) {
1830 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1831 return rdev->sb_size;
1835 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1838 errors_show(mdk_rdev_t *rdev, char *page)
1840 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1844 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1847 unsigned long n = simple_strtoul(buf, &e, 10);
1848 if (*buf && (*e == 0 || *e == '\n')) {
1849 atomic_set(&rdev->corrected_errors, n);
1854 static struct rdev_sysfs_entry rdev_errors =
1855 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1858 slot_show(mdk_rdev_t *rdev, char *page)
1860 if (rdev->raid_disk < 0)
1861 return sprintf(page, "none\n");
1863 return sprintf(page, "%d\n", rdev->raid_disk);
1867 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1870 int slot = simple_strtoul(buf, &e, 10);
1871 if (strncmp(buf, "none", 4)==0)
1873 else if (e==buf || (*e && *e!= '\n'))
1875 if (rdev->mddev->pers)
1876 /* Cannot set slot in active array (yet) */
1878 if (slot >= rdev->mddev->raid_disks)
1880 rdev->raid_disk = slot;
1881 /* assume it is working */
1883 set_bit(In_sync, &rdev->flags);
1888 static struct rdev_sysfs_entry rdev_slot =
1889 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
1892 offset_show(mdk_rdev_t *rdev, char *page)
1894 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1898 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1901 unsigned long long offset = simple_strtoull(buf, &e, 10);
1902 if (e==buf || (*e && *e != '\n'))
1904 if (rdev->mddev->pers)
1906 rdev->data_offset = offset;
1910 static struct rdev_sysfs_entry rdev_offset =
1911 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
1914 rdev_size_show(mdk_rdev_t *rdev, char *page)
1916 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1920 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1923 unsigned long long size = simple_strtoull(buf, &e, 10);
1924 if (e==buf || (*e && *e != '\n'))
1926 if (rdev->mddev->pers)
1929 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1930 rdev->mddev->size = size;
1934 static struct rdev_sysfs_entry rdev_size =
1935 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
1937 static struct attribute *rdev_default_attrs[] = {
1947 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1949 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1950 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1954 return entry->show(rdev, page);
1958 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1959 const char *page, size_t length)
1961 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1962 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1966 if (!capable(CAP_SYS_ADMIN))
1968 return entry->store(rdev, page, length);
1971 static void rdev_free(struct kobject *ko)
1973 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1976 static struct sysfs_ops rdev_sysfs_ops = {
1977 .show = rdev_attr_show,
1978 .store = rdev_attr_store,
1980 static struct kobj_type rdev_ktype = {
1981 .release = rdev_free,
1982 .sysfs_ops = &rdev_sysfs_ops,
1983 .default_attrs = rdev_default_attrs,
1987 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1989 * mark the device faulty if:
1991 * - the device is nonexistent (zero size)
1992 * - the device has no valid superblock
1994 * a faulty rdev _never_ has rdev->sb set.
1996 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1998 char b[BDEVNAME_SIZE];
2003 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2005 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2006 return ERR_PTR(-ENOMEM);
2009 if ((err = alloc_disk_sb(rdev)))
2012 err = lock_rdev(rdev, newdev);
2016 rdev->kobj.parent = NULL;
2017 rdev->kobj.ktype = &rdev_ktype;
2018 kobject_init(&rdev->kobj);
2021 rdev->saved_raid_disk = -1;
2022 rdev->raid_disk = -1;
2024 rdev->data_offset = 0;
2025 rdev->sb_events = 0;
2026 atomic_set(&rdev->nr_pending, 0);
2027 atomic_set(&rdev->read_errors, 0);
2028 atomic_set(&rdev->corrected_errors, 0);
2030 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2033 "md: %s has zero or unknown size, marking faulty!\n",
2034 bdevname(rdev->bdev,b));
2039 if (super_format >= 0) {
2040 err = super_types[super_format].
2041 load_super(rdev, NULL, super_minor);
2042 if (err == -EINVAL) {
2044 "md: %s has invalid sb, not importing!\n",
2045 bdevname(rdev->bdev,b));
2050 "md: could not read %s's sb, not importing!\n",
2051 bdevname(rdev->bdev,b));
2055 INIT_LIST_HEAD(&rdev->same_set);
2060 if (rdev->sb_page) {
2066 return ERR_PTR(err);
2070 * Check a full RAID array for plausibility
2074 static void analyze_sbs(mddev_t * mddev)
2077 struct list_head *tmp;
2078 mdk_rdev_t *rdev, *freshest;
2079 char b[BDEVNAME_SIZE];
2082 ITERATE_RDEV(mddev,rdev,tmp)
2083 switch (super_types[mddev->major_version].
2084 load_super(rdev, freshest, mddev->minor_version)) {
2092 "md: fatal superblock inconsistency in %s"
2093 " -- removing from array\n",
2094 bdevname(rdev->bdev,b));
2095 kick_rdev_from_array(rdev);
2099 super_types[mddev->major_version].
2100 validate_super(mddev, freshest);
2103 ITERATE_RDEV(mddev,rdev,tmp) {
2104 if (rdev != freshest)
2105 if (super_types[mddev->major_version].
2106 validate_super(mddev, rdev)) {
2107 printk(KERN_WARNING "md: kicking non-fresh %s"
2109 bdevname(rdev->bdev,b));
2110 kick_rdev_from_array(rdev);
2113 if (mddev->level == LEVEL_MULTIPATH) {
2114 rdev->desc_nr = i++;
2115 rdev->raid_disk = rdev->desc_nr;
2116 set_bit(In_sync, &rdev->flags);
2122 if (mddev->recovery_cp != MaxSector &&
2124 printk(KERN_ERR "md: %s: raid array is not clean"
2125 " -- starting background reconstruction\n",
2131 safe_delay_show(mddev_t *mddev, char *page)
2133 int msec = (mddev->safemode_delay*1000)/HZ;
2134 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2137 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2145 /* remove a period, and count digits after it */
2146 if (len >= sizeof(buf))
2148 strlcpy(buf, cbuf, len);
2150 for (i=0; i<len; i++) {
2152 if (isdigit(buf[i])) {
2157 } else if (buf[i] == '.') {
2162 msec = simple_strtoul(buf, &e, 10);
2163 if (e == buf || (*e && *e != '\n'))
2165 msec = (msec * 1000) / scale;
2167 mddev->safemode_delay = 0;
2169 mddev->safemode_delay = (msec*HZ)/1000;
2170 if (mddev->safemode_delay == 0)
2171 mddev->safemode_delay = 1;
2175 static struct md_sysfs_entry md_safe_delay =
2176 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2179 level_show(mddev_t *mddev, char *page)
2181 struct mdk_personality *p = mddev->pers;
2183 return sprintf(page, "%s\n", p->name);
2184 else if (mddev->clevel[0])
2185 return sprintf(page, "%s\n", mddev->clevel);
2186 else if (mddev->level != LEVEL_NONE)
2187 return sprintf(page, "%d\n", mddev->level);
2193 level_store(mddev_t *mddev, const char *buf, size_t len)
2200 if (len >= sizeof(mddev->clevel))
2202 strncpy(mddev->clevel, buf, len);
2203 if (mddev->clevel[len-1] == '\n')
2205 mddev->clevel[len] = 0;
2206 mddev->level = LEVEL_NONE;
2210 static struct md_sysfs_entry md_level =
2211 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2215 layout_show(mddev_t *mddev, char *page)
2217 /* just a number, not meaningful for all levels */
2218 return sprintf(page, "%d\n", mddev->layout);
2222 layout_store(mddev_t *mddev, const char *buf, size_t len)
2225 unsigned long n = simple_strtoul(buf, &e, 10);
2229 if (!*buf || (*e && *e != '\n'))
2235 static struct md_sysfs_entry md_layout =
2236 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2240 raid_disks_show(mddev_t *mddev, char *page)
2242 if (mddev->raid_disks == 0)
2244 return sprintf(page, "%d\n", mddev->raid_disks);
2247 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2250 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2254 unsigned long n = simple_strtoul(buf, &e, 10);
2256 if (!*buf || (*e && *e != '\n'))
2260 rv = update_raid_disks(mddev, n);
2262 mddev->raid_disks = n;
2263 return rv ? rv : len;
2265 static struct md_sysfs_entry md_raid_disks =
2266 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2269 chunk_size_show(mddev_t *mddev, char *page)
2271 return sprintf(page, "%d\n", mddev->chunk_size);
2275 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2277 /* can only set chunk_size if array is not yet active */
2279 unsigned long n = simple_strtoul(buf, &e, 10);
2283 if (!*buf || (*e && *e != '\n'))
2286 mddev->chunk_size = n;
2289 static struct md_sysfs_entry md_chunk_size =
2290 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2293 resync_start_show(mddev_t *mddev, char *page)
2295 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2299 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2301 /* can only set chunk_size if array is not yet active */
2303 unsigned long long n = simple_strtoull(buf, &e, 10);
2307 if (!*buf || (*e && *e != '\n'))
2310 mddev->recovery_cp = n;
2313 static struct md_sysfs_entry md_resync_start =
2314 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2317 * The array state can be:
2320 * No devices, no size, no level
2321 * Equivalent to STOP_ARRAY ioctl
2323 * May have some settings, but array is not active
2324 * all IO results in error
2325 * When written, doesn't tear down array, but just stops it
2326 * suspended (not supported yet)
2327 * All IO requests will block. The array can be reconfigured.
2328 * Writing this, if accepted, will block until array is quiessent
2330 * no resync can happen. no superblocks get written.
2331 * write requests fail
2333 * like readonly, but behaves like 'clean' on a write request.
2335 * clean - no pending writes, but otherwise active.
2336 * When written to inactive array, starts without resync
2337 * If a write request arrives then
2338 * if metadata is known, mark 'dirty' and switch to 'active'.
2339 * if not known, block and switch to write-pending
2340 * If written to an active array that has pending writes, then fails.
2342 * fully active: IO and resync can be happening.
2343 * When written to inactive array, starts with resync
2346 * clean, but writes are blocked waiting for 'active' to be written.
2349 * like active, but no writes have been seen for a while (100msec).
2352 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2353 write_pending, active_idle, bad_word};
2354 static char *array_states[] = {
2355 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2356 "write-pending", "active-idle", NULL };
2358 static int match_word(const char *word, char **list)
2361 for (n=0; list[n]; n++)
2362 if (cmd_match(word, list[n]))
2368 array_state_show(mddev_t *mddev, char *page)
2370 enum array_state st = inactive;
2383 else if (mddev->safemode)
2389 if (list_empty(&mddev->disks) &&
2390 mddev->raid_disks == 0 &&
2396 return sprintf(page, "%s\n", array_states[st]);
2399 static int do_md_stop(mddev_t * mddev, int ro);
2400 static int do_md_run(mddev_t * mddev);
2401 static int restart_array(mddev_t *mddev);
2404 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2407 enum array_state st = match_word(buf, array_states);
2412 /* stopping an active array */
2414 if (atomic_read(&mddev->active) > 1)
2416 err = do_md_stop(mddev, 0);
2420 /* stopping an active array */
2422 if (atomic_read(&mddev->active) > 1)
2424 err = do_md_stop(mddev, 2);
2428 break; /* not supported yet */
2431 err = do_md_stop(mddev, 1);
2434 err = do_md_run(mddev);
2438 /* stopping an active array */
2440 err = do_md_stop(mddev, 1);
2442 mddev->ro = 2; /* FIXME mark devices writable */
2445 err = do_md_run(mddev);
2450 restart_array(mddev);
2451 spin_lock_irq(&mddev->write_lock);
2452 if (atomic_read(&mddev->writes_pending) == 0) {
2454 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
2456 spin_unlock_irq(&mddev->write_lock);
2459 mddev->recovery_cp = MaxSector;
2460 err = do_md_run(mddev);
2465 restart_array(mddev);
2466 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2467 wake_up(&mddev->sb_wait);
2471 err = do_md_run(mddev);
2476 /* these cannot be set */
2484 static struct md_sysfs_entry md_array_state =
2485 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2488 null_show(mddev_t *mddev, char *page)
2494 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2496 /* buf must be %d:%d\n? giving major and minor numbers */
2497 /* The new device is added to the array.
2498 * If the array has a persistent superblock, we read the
2499 * superblock to initialise info and check validity.
2500 * Otherwise, only checking done is that in bind_rdev_to_array,
2501 * which mainly checks size.
2504 int major = simple_strtoul(buf, &e, 10);
2510 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2512 minor = simple_strtoul(e+1, &e, 10);
2513 if (*e && *e != '\n')
2515 dev = MKDEV(major, minor);
2516 if (major != MAJOR(dev) ||
2517 minor != MINOR(dev))
2521 if (mddev->persistent) {
2522 rdev = md_import_device(dev, mddev->major_version,
2523 mddev->minor_version);
2524 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2525 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2526 mdk_rdev_t, same_set);
2527 err = super_types[mddev->major_version]
2528 .load_super(rdev, rdev0, mddev->minor_version);
2533 rdev = md_import_device(dev, -1, -1);
2536 return PTR_ERR(rdev);
2537 err = bind_rdev_to_array(rdev, mddev);
2541 return err ? err : len;
2544 static struct md_sysfs_entry md_new_device =
2545 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2548 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2551 unsigned long chunk, end_chunk;
2555 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2557 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2558 if (buf == end) break;
2559 if (*end == '-') { /* range */
2561 end_chunk = simple_strtoul(buf, &end, 0);
2562 if (buf == end) break;
2564 if (*end && !isspace(*end)) break;
2565 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2567 while (isspace(*buf)) buf++;
2569 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2574 static struct md_sysfs_entry md_bitmap =
2575 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2578 size_show(mddev_t *mddev, char *page)
2580 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2583 static int update_size(mddev_t *mddev, unsigned long size);
2586 size_store(mddev_t *mddev, const char *buf, size_t len)
2588 /* If array is inactive, we can reduce the component size, but
2589 * not increase it (except from 0).
2590 * If array is active, we can try an on-line resize
2594 unsigned long long size = simple_strtoull(buf, &e, 10);
2595 if (!*buf || *buf == '\n' ||
2600 err = update_size(mddev, size);
2601 md_update_sb(mddev, 1);
2603 if (mddev->size == 0 ||
2609 return err ? err : len;
2612 static struct md_sysfs_entry md_size =
2613 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2617 * This is either 'none' for arrays with externally managed metadata,
2618 * or N.M for internally known formats
2621 metadata_show(mddev_t *mddev, char *page)
2623 if (mddev->persistent)
2624 return sprintf(page, "%d.%d\n",
2625 mddev->major_version, mddev->minor_version);
2627 return sprintf(page, "none\n");
2631 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2635 if (!list_empty(&mddev->disks))
2638 if (cmd_match(buf, "none")) {
2639 mddev->persistent = 0;
2640 mddev->major_version = 0;
2641 mddev->minor_version = 90;
2644 major = simple_strtoul(buf, &e, 10);
2645 if (e==buf || *e != '.')
2648 minor = simple_strtoul(buf, &e, 10);
2649 if (e==buf || (*e && *e != '\n') )
2651 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2653 mddev->major_version = major;
2654 mddev->minor_version = minor;
2655 mddev->persistent = 1;
2659 static struct md_sysfs_entry md_metadata =
2660 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2663 action_show(mddev_t *mddev, char *page)
2665 char *type = "idle";
2666 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2667 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2668 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2670 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2671 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2673 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2680 return sprintf(page, "%s\n", type);
2684 action_store(mddev_t *mddev, const char *page, size_t len)
2686 if (!mddev->pers || !mddev->pers->sync_request)
2689 if (cmd_match(page, "idle")) {
2690 if (mddev->sync_thread) {
2691 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2692 md_unregister_thread(mddev->sync_thread);
2693 mddev->sync_thread = NULL;
2694 mddev->recovery = 0;
2696 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2697 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2699 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2700 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2701 else if (cmd_match(page, "reshape")) {
2703 if (mddev->pers->start_reshape == NULL)
2705 err = mddev->pers->start_reshape(mddev);
2709 if (cmd_match(page, "check"))
2710 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2711 else if (!cmd_match(page, "repair"))
2713 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2714 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2716 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2717 md_wakeup_thread(mddev->thread);
2722 mismatch_cnt_show(mddev_t *mddev, char *page)
2724 return sprintf(page, "%llu\n",
2725 (unsigned long long) mddev->resync_mismatches);
2728 static struct md_sysfs_entry md_scan_mode =
2729 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2732 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
2735 sync_min_show(mddev_t *mddev, char *page)
2737 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2738 mddev->sync_speed_min ? "local": "system");
2742 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2746 if (strncmp(buf, "system", 6)==0) {
2747 mddev->sync_speed_min = 0;
2750 min = simple_strtoul(buf, &e, 10);
2751 if (buf == e || (*e && *e != '\n') || min <= 0)
2753 mddev->sync_speed_min = min;
2757 static struct md_sysfs_entry md_sync_min =
2758 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2761 sync_max_show(mddev_t *mddev, char *page)
2763 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2764 mddev->sync_speed_max ? "local": "system");
2768 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2772 if (strncmp(buf, "system", 6)==0) {
2773 mddev->sync_speed_max = 0;
2776 max = simple_strtoul(buf, &e, 10);
2777 if (buf == e || (*e && *e != '\n') || max <= 0)
2779 mddev->sync_speed_max = max;
2783 static struct md_sysfs_entry md_sync_max =
2784 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2788 sync_speed_show(mddev_t *mddev, char *page)
2790 unsigned long resync, dt, db;
2791 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
2792 dt = ((jiffies - mddev->resync_mark) / HZ);
2794 db = resync - (mddev->resync_mark_cnt);
2795 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2798 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
2801 sync_completed_show(mddev_t *mddev, char *page)
2803 unsigned long max_blocks, resync;
2805 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2806 max_blocks = mddev->resync_max_sectors;
2808 max_blocks = mddev->size << 1;
2810 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2811 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2814 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
2817 suspend_lo_show(mddev_t *mddev, char *page)
2819 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2823 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2826 unsigned long long new = simple_strtoull(buf, &e, 10);
2828 if (mddev->pers->quiesce == NULL)
2830 if (buf == e || (*e && *e != '\n'))
2832 if (new >= mddev->suspend_hi ||
2833 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2834 mddev->suspend_lo = new;
2835 mddev->pers->quiesce(mddev, 2);
2840 static struct md_sysfs_entry md_suspend_lo =
2841 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2845 suspend_hi_show(mddev_t *mddev, char *page)
2847 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2851 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2854 unsigned long long new = simple_strtoull(buf, &e, 10);
2856 if (mddev->pers->quiesce == NULL)
2858 if (buf == e || (*e && *e != '\n'))
2860 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2861 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2862 mddev->suspend_hi = new;
2863 mddev->pers->quiesce(mddev, 1);
2864 mddev->pers->quiesce(mddev, 0);
2869 static struct md_sysfs_entry md_suspend_hi =
2870 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2873 static struct attribute *md_default_attrs[] = {
2876 &md_raid_disks.attr,
2877 &md_chunk_size.attr,
2879 &md_resync_start.attr,
2881 &md_new_device.attr,
2882 &md_safe_delay.attr,
2883 &md_array_state.attr,
2887 static struct attribute *md_redundancy_attrs[] = {
2889 &md_mismatches.attr,
2892 &md_sync_speed.attr,
2893 &md_sync_completed.attr,
2894 &md_suspend_lo.attr,
2895 &md_suspend_hi.attr,
2899 static struct attribute_group md_redundancy_group = {
2901 .attrs = md_redundancy_attrs,
2906 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2908 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2909 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2914 rv = mddev_lock(mddev);
2916 rv = entry->show(mddev, page);
2917 mddev_unlock(mddev);
2923 md_attr_store(struct kobject *kobj, struct attribute *attr,
2924 const char *page, size_t length)
2926 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2927 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2932 if (!capable(CAP_SYS_ADMIN))
2934 rv = mddev_lock(mddev);
2936 rv = entry->store(mddev, page, length);
2937 mddev_unlock(mddev);
2942 static void md_free(struct kobject *ko)
2944 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2948 static struct sysfs_ops md_sysfs_ops = {
2949 .show = md_attr_show,
2950 .store = md_attr_store,
2952 static struct kobj_type md_ktype = {
2954 .sysfs_ops = &md_sysfs_ops,
2955 .default_attrs = md_default_attrs,
2960 static struct kobject *md_probe(dev_t dev, int *part, void *data)
2962 static DEFINE_MUTEX(disks_mutex);
2963 mddev_t *mddev = mddev_find(dev);
2964 struct gendisk *disk;
2965 int partitioned = (MAJOR(dev) != MD_MAJOR);
2966 int shift = partitioned ? MdpMinorShift : 0;
2967 int unit = MINOR(dev) >> shift;
2972 mutex_lock(&disks_mutex);
2973 if (mddev->gendisk) {
2974 mutex_unlock(&disks_mutex);
2978 disk = alloc_disk(1 << shift);
2980 mutex_unlock(&disks_mutex);
2984 disk->major = MAJOR(dev);
2985 disk->first_minor = unit << shift;
2987 sprintf(disk->disk_name, "md_d%d", unit);
2989 sprintf(disk->disk_name, "md%d", unit);
2990 disk->fops = &md_fops;
2991 disk->private_data = mddev;
2992 disk->queue = mddev->queue;
2994 mddev->gendisk = disk;
2995 mutex_unlock(&disks_mutex);
2996 mddev->kobj.parent = &disk->kobj;
2997 mddev->kobj.k_name = NULL;
2998 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2999 mddev->kobj.ktype = &md_ktype;
3000 if (kobject_register(&mddev->kobj))
3001 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3006 static void md_safemode_timeout(unsigned long data)
3008 mddev_t *mddev = (mddev_t *) data;
3010 mddev->safemode = 1;
3011 md_wakeup_thread(mddev->thread);
3014 static int start_dirty_degraded;
3016 static int do_md_run(mddev_t * mddev)
3020 struct list_head *tmp;
3022 struct gendisk *disk;
3023 struct mdk_personality *pers;
3024 char b[BDEVNAME_SIZE];
3026 if (list_empty(&mddev->disks))
3027 /* cannot run an array with no devices.. */
3034 * Analyze all RAID superblock(s)
3036 if (!mddev->raid_disks)
3039 chunk_size = mddev->chunk_size;
3042 if (chunk_size > MAX_CHUNK_SIZE) {
3043 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3044 chunk_size, MAX_CHUNK_SIZE);
3048 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3050 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3051 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3054 if (chunk_size < PAGE_SIZE) {
3055 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3056 chunk_size, PAGE_SIZE);
3060 /* devices must have minimum size of one chunk */
3061 ITERATE_RDEV(mddev,rdev,tmp) {
3062 if (test_bit(Faulty, &rdev->flags))
3064 if (rdev->size < chunk_size / 1024) {
3066 "md: Dev %s smaller than chunk_size:"
3068 bdevname(rdev->bdev,b),
3069 (unsigned long long)rdev->size,
3077 if (mddev->level != LEVEL_NONE)
3078 request_module("md-level-%d", mddev->level);
3079 else if (mddev->clevel[0])
3080 request_module("md-%s", mddev->clevel);
3084 * Drop all container device buffers, from now on
3085 * the only valid external interface is through the md
3087 * Also find largest hardsector size
3089 ITERATE_RDEV(mddev,rdev,tmp) {
3090 if (test_bit(Faulty, &rdev->flags))
3092 sync_blockdev(rdev->bdev);
3093 invalidate_bdev(rdev->bdev);
3096 md_probe(mddev->unit, NULL, NULL);
3097 disk = mddev->gendisk;
3101 spin_lock(&pers_lock);
3102 pers = find_pers(mddev->level, mddev->clevel);
3103 if (!pers || !try_module_get(pers->owner)) {
3104 spin_unlock(&pers_lock);
3105 if (mddev->level != LEVEL_NONE)
3106 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3109 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3114 spin_unlock(&pers_lock);
3115 mddev->level = pers->level;
3116 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3118 if (mddev->reshape_position != MaxSector &&
3119 pers->start_reshape == NULL) {
3120 /* This personality cannot handle reshaping... */
3122 module_put(pers->owner);
3126 if (pers->sync_request) {
3127 /* Warn if this is a potentially silly
3130 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3132 struct list_head *tmp2;
3134 ITERATE_RDEV(mddev, rdev, tmp) {
3135 ITERATE_RDEV(mddev, rdev2, tmp2) {
3137 rdev->bdev->bd_contains ==
3138 rdev2->bdev->bd_contains) {
3140 "%s: WARNING: %s appears to be"
3141 " on the same physical disk as"
3144 bdevname(rdev->bdev,b),
3145 bdevname(rdev2->bdev,b2));
3152 "True protection against single-disk"
3153 " failure might be compromised.\n");
3156 mddev->recovery = 0;
3157 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3158 mddev->barriers_work = 1;
3159 mddev->ok_start_degraded = start_dirty_degraded;
3162 mddev->ro = 2; /* read-only, but switch on first write */
3164 err = mddev->pers->run(mddev);
3165 if (!err && mddev->pers->sync_request) {
3166 err = bitmap_create(mddev);
3168 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3169 mdname(mddev), err);
3170 mddev->pers->stop(mddev);
3174 printk(KERN_ERR "md: pers->run() failed ...\n");
3175 module_put(mddev->pers->owner);
3177 bitmap_destroy(mddev);
3180 if (mddev->pers->sync_request) {
3181 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3183 "md: cannot register extra attributes for %s\n",
3185 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3188 atomic_set(&mddev->writes_pending,0);
3189 mddev->safemode = 0;
3190 mddev->safemode_timer.function = md_safemode_timeout;
3191 mddev->safemode_timer.data = (unsigned long) mddev;
3192 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3195 ITERATE_RDEV(mddev,rdev,tmp)
3196 if (rdev->raid_disk >= 0) {
3198 sprintf(nm, "rd%d", rdev->raid_disk);
3199 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3200 printk("md: cannot register %s for %s\n",
3204 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3207 md_update_sb(mddev, 0);
3209 set_capacity(disk, mddev->array_size<<1);
3211 /* If we call blk_queue_make_request here, it will
3212 * re-initialise max_sectors etc which may have been
3213 * refined inside -> run. So just set the bits we need to set.
3214 * Most initialisation happended when we called
3215 * blk_queue_make_request(..., md_fail_request)
3218 mddev->queue->queuedata = mddev;
3219 mddev->queue->make_request_fn = mddev->pers->make_request;
3221 /* If there is a partially-recovered drive we need to
3222 * start recovery here. If we leave it to md_check_recovery,
3223 * it will remove the drives and not do the right thing
3225 if (mddev->degraded && !mddev->sync_thread) {
3226 struct list_head *rtmp;
3228 ITERATE_RDEV(mddev,rdev,rtmp)
3229 if (rdev->raid_disk >= 0 &&
3230 !test_bit(In_sync, &rdev->flags) &&
3231 !test_bit(Faulty, &rdev->flags))
3232 /* complete an interrupted recovery */
3234 if (spares && mddev->pers->sync_request) {
3235 mddev->recovery = 0;
3236 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3237 mddev->sync_thread = md_register_thread(md_do_sync,
3240 if (!mddev->sync_thread) {
3241 printk(KERN_ERR "%s: could not start resync"
3244 /* leave the spares where they are, it shouldn't hurt */
3245 mddev->recovery = 0;
3249 md_wakeup_thread(mddev->thread);
3250 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3253 md_new_event(mddev);
3254 kobject_uevent(&mddev->gendisk->kobj, KOBJ_CHANGE);
3258 static int restart_array(mddev_t *mddev)
3260 struct gendisk *disk = mddev->gendisk;
3264 * Complain if it has no devices
3267 if (list_empty(&mddev->disks))
3275 mddev->safemode = 0;
3277 set_disk_ro(disk, 0);
3279 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3282 * Kick recovery or resync if necessary
3284 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3285 md_wakeup_thread(mddev->thread);
3286 md_wakeup_thread(mddev->sync_thread);
3295 /* similar to deny_write_access, but accounts for our holding a reference
3296 * to the file ourselves */
3297 static int deny_bitmap_write_access(struct file * file)
3299 struct inode *inode = file->f_mapping->host;
3301 spin_lock(&inode->i_lock);
3302 if (atomic_read(&inode->i_writecount) > 1) {
3303 spin_unlock(&inode->i_lock);
3306 atomic_set(&inode->i_writecount, -1);
3307 spin_unlock(&inode->i_lock);
3312 static void restore_bitmap_write_access(struct file *file)
3314 struct inode *inode = file->f_mapping->host;
3316 spin_lock(&inode->i_lock);
3317 atomic_set(&inode->i_writecount, 1);
3318 spin_unlock(&inode->i_lock);
3322 * 0 - completely stop and dis-assemble array
3323 * 1 - switch to readonly
3324 * 2 - stop but do not disassemble array
3326 static int do_md_stop(mddev_t * mddev, int mode)
3329 struct gendisk *disk = mddev->gendisk;
3332 if (atomic_read(&mddev->active)>2) {
3333 printk("md: %s still in use.\n",mdname(mddev));
3337 if (mddev->sync_thread) {
3338 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3339 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3340 md_unregister_thread(mddev->sync_thread);
3341 mddev->sync_thread = NULL;
3344 del_timer_sync(&mddev->safemode_timer);
3346 invalidate_partition(disk, 0);
3349 case 1: /* readonly */
3355 case 0: /* disassemble */
3357 bitmap_flush(mddev);
3358 md_super_wait(mddev);
3360 set_disk_ro(disk, 0);
3361 blk_queue_make_request(mddev->queue, md_fail_request);
3362 mddev->pers->stop(mddev);
3363 mddev->queue->merge_bvec_fn = NULL;
3364 mddev->queue->unplug_fn = NULL;
3365 mddev->queue->issue_flush_fn = NULL;
3366 mddev->queue->backing_dev_info.congested_fn = NULL;
3367 if (mddev->pers->sync_request)
3368 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3370 module_put(mddev->pers->owner);
3373 set_capacity(disk, 0);
3379 if (!mddev->in_sync || mddev->flags) {
3380 /* mark array as shutdown cleanly */
3382 md_update_sb(mddev, 1);
3385 set_disk_ro(disk, 1);
3386 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3390 * Free resources if final stop
3394 struct list_head *tmp;
3396 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3398 bitmap_destroy(mddev);
3399 if (mddev->bitmap_file) {
3400 restore_bitmap_write_access(mddev->bitmap_file);
3401 fput(mddev->bitmap_file);
3402 mddev->bitmap_file = NULL;
3404 mddev->bitmap_offset = 0;
3406 ITERATE_RDEV(mddev,rdev,tmp)
3407 if (rdev->raid_disk >= 0) {
3409 sprintf(nm, "rd%d", rdev->raid_disk);
3410 sysfs_remove_link(&mddev->kobj, nm);
3413 /* make sure all delayed_delete calls have finished */
3414 flush_scheduled_work();
3416 export_array(mddev);
3418 mddev->array_size = 0;
3420 mddev->raid_disks = 0;
3421 mddev->recovery_cp = 0;
3423 } else if (mddev->pers)
3424 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3427 md_new_event(mddev);
3433 static void autorun_array(mddev_t *mddev)
3436 struct list_head *tmp;
3439 if (list_empty(&mddev->disks))
3442 printk(KERN_INFO "md: running: ");
3444 ITERATE_RDEV(mddev,rdev,tmp) {
3445 char b[BDEVNAME_SIZE];
3446 printk("<%s>", bdevname(rdev->bdev,b));
3450 err = do_md_run (mddev);
3452 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3453 do_md_stop (mddev, 0);
3458 * lets try to run arrays based on all disks that have arrived
3459 * until now. (those are in pending_raid_disks)
3461 * the method: pick the first pending disk, collect all disks with
3462 * the same UUID, remove all from the pending list and put them into
3463 * the 'same_array' list. Then order this list based on superblock
3464 * update time (freshest comes first), kick out 'old' disks and
3465 * compare superblocks. If everything's fine then run it.
3467 * If "unit" is allocated, then bump its reference count
3469 static void autorun_devices(int part)
3471 struct list_head *tmp;
3472 mdk_rdev_t *rdev0, *rdev;
3474 char b[BDEVNAME_SIZE];
3476 printk(KERN_INFO "md: autorun ...\n");
3477 while (!list_empty(&pending_raid_disks)) {
3480 LIST_HEAD(candidates);
3481 rdev0 = list_entry(pending_raid_disks.next,
3482 mdk_rdev_t, same_set);
3484 printk(KERN_INFO "md: considering %s ...\n",
3485 bdevname(rdev0->bdev,b));
3486 INIT_LIST_HEAD(&candidates);
3487 ITERATE_RDEV_PENDING(rdev,tmp)
3488 if (super_90_load(rdev, rdev0, 0) >= 0) {
3489 printk(KERN_INFO "md: adding %s ...\n",
3490 bdevname(rdev->bdev,b));
3491 list_move(&rdev->same_set, &candidates);
3494 * now we have a set of devices, with all of them having
3495 * mostly sane superblocks. It's time to allocate the
3499 dev = MKDEV(mdp_major,
3500 rdev0->preferred_minor << MdpMinorShift);
3501 unit = MINOR(dev) >> MdpMinorShift;
3503 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3506 if (rdev0->preferred_minor != unit) {
3507 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3508 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3512 md_probe(dev, NULL, NULL);
3513 mddev = mddev_find(dev);
3516 "md: cannot allocate memory for md drive.\n");
3519 if (mddev_lock(mddev))
3520 printk(KERN_WARNING "md: %s locked, cannot run\n",
3522 else if (mddev->raid_disks || mddev->major_version
3523 || !list_empty(&mddev->disks)) {
3525 "md: %s already running, cannot run %s\n",
3526 mdname(mddev), bdevname(rdev0->bdev,b));
3527 mddev_unlock(mddev);
3529 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3530 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3531 list_del_init(&rdev->same_set);
3532 if (bind_rdev_to_array(rdev, mddev))
3535 autorun_array(mddev);
3536 mddev_unlock(mddev);
3538 /* on success, candidates will be empty, on error
3541 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3545 printk(KERN_INFO "md: ... autorun DONE.\n");
3547 #endif /* !MODULE */
3549 static int get_version(void __user * arg)
3553 ver.major = MD_MAJOR_VERSION;
3554 ver.minor = MD_MINOR_VERSION;
3555 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3557 if (copy_to_user(arg, &ver, sizeof(ver)))
3563 static int get_array_info(mddev_t * mddev, void __user * arg)
3565 mdu_array_info_t info;
3566 int nr,working,active,failed,spare;
3568 struct list_head *tmp;
3570 nr=working=active=failed=spare=0;
3571 ITERATE_RDEV(mddev,rdev,tmp) {
3573 if (test_bit(Faulty, &rdev->flags))
3577 if (test_bit(In_sync, &rdev->flags))
3584 info.major_version = mddev->major_version;
3585 info.minor_version = mddev->minor_version;
3586 info.patch_version = MD_PATCHLEVEL_VERSION;
3587 info.ctime = mddev->ctime;
3588 info.level = mddev->level;
3589 info.size = mddev->size;
3590 if (info.size != mddev->size) /* overflow */
3593 info.raid_disks = mddev->raid_disks;
3594 info.md_minor = mddev->md_minor;
3595 info.not_persistent= !mddev->persistent;
3597 info.utime = mddev->utime;
3600 info.state = (1<<MD_SB_CLEAN);
3601 if (mddev->bitmap && mddev->bitmap_offset)
3602 info.state = (1<<MD_SB_BITMAP_PRESENT);
3603 info.active_disks = active;
3604 info.working_disks = working;
3605 info.failed_disks = failed;
3606 info.spare_disks = spare;
3608 info.layout = mddev->layout;
3609 info.chunk_size = mddev->chunk_size;
3611 if (copy_to_user(arg, &info, sizeof(info)))
3617 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
3619 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3620 char *ptr, *buf = NULL;
3623 md_allow_write(mddev);
3625 file = kmalloc(sizeof(*file), GFP_KERNEL);
3629 /* bitmap disabled, zero the first byte and copy out */
3630 if (!mddev->bitmap || !mddev->bitmap->file) {
3631 file->pathname[0] = '\0';
3635 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3639 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3643 strcpy(file->pathname, ptr);
3647 if (copy_to_user(arg, file, sizeof(*file)))
3655 static int get_disk_info(mddev_t * mddev, void __user * arg)
3657 mdu_disk_info_t info;
3661 if (copy_from_user(&info, arg, sizeof(info)))
3666 rdev = find_rdev_nr(mddev, nr);
3668 info.major = MAJOR(rdev->bdev->bd_dev);
3669 info.minor = MINOR(rdev->bdev->bd_dev);
3670 info.raid_disk = rdev->raid_disk;
3672 if (test_bit(Faulty, &rdev->flags))
3673 info.state |= (1<<MD_DISK_FAULTY);
3674 else if (test_bit(In_sync, &rdev->flags)) {
3675 info.state |= (1<<MD_DISK_ACTIVE);
3676 info.state |= (1<<MD_DISK_SYNC);
3678 if (test_bit(WriteMostly, &rdev->flags))
3679 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3681 info.major = info.minor = 0;
3682 info.raid_disk = -1;
3683 info.state = (1<<MD_DISK_REMOVED);
3686 if (copy_to_user(arg, &info, sizeof(info)))
3692 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3694 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3696 dev_t dev = MKDEV(info->major,info->minor);
3698 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3701 if (!mddev->raid_disks) {
3703 /* expecting a device which has a superblock */
3704 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3707 "md: md_import_device returned %ld\n",
3709 return PTR_ERR(rdev);
3711 if (!list_empty(&mddev->disks)) {
3712 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3713 mdk_rdev_t, same_set);
3714 int err = super_types[mddev->major_version]
3715 .load_super(rdev, rdev0, mddev->minor_version);
3718 "md: %s has different UUID to %s\n",
3719 bdevname(rdev->bdev,b),
3720 bdevname(rdev0->bdev,b2));
3725 err = bind_rdev_to_array(rdev, mddev);
3732 * add_new_disk can be used once the array is assembled
3733 * to add "hot spares". They must already have a superblock
3738 if (!mddev->pers->hot_add_disk) {
3740 "%s: personality does not support diskops!\n",
3744 if (mddev->persistent)
3745 rdev = md_import_device(dev, mddev->major_version,
3746 mddev->minor_version);
3748 rdev = md_import_device(dev, -1, -1);
3751 "md: md_import_device returned %ld\n",
3753 return PTR_ERR(rdev);
3755 /* set save_raid_disk if appropriate */
3756 if (!mddev->persistent) {
3757 if (info->state & (1<<MD_DISK_SYNC) &&
3758 info->raid_disk < mddev->raid_disks)
3759 rdev->raid_disk = info->raid_disk;
3761 rdev->raid_disk = -1;
3763 super_types[mddev->major_version].
3764 validate_super(mddev, rdev);
3765 rdev->saved_raid_disk = rdev->raid_disk;
3767 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3768 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3769 set_bit(WriteMostly, &rdev->flags);
3771 rdev->raid_disk = -1;
3772 err = bind_rdev_to_array(rdev, mddev);
3773 if (!err && !mddev->pers->hot_remove_disk) {
3774 /* If there is hot_add_disk but no hot_remove_disk
3775 * then added disks for geometry changes,
3776 * and should be added immediately.
3778 super_types[mddev->major_version].
3779 validate_super(mddev, rdev);
3780 err = mddev->pers->hot_add_disk(mddev, rdev);
3782 unbind_rdev_from_array(rdev);
3787 md_update_sb(mddev, 1);
3788 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3789 md_wakeup_thread(mddev->thread);
3793 /* otherwise, add_new_disk is only allowed
3794 * for major_version==0 superblocks
3796 if (mddev->major_version != 0) {
3797 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3802 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3804 rdev = md_import_device (dev, -1, 0);
3807 "md: error, md_import_device() returned %ld\n",
3809 return PTR_ERR(rdev);
3811 rdev->desc_nr = info->number;
3812 if (info->raid_disk < mddev->raid_disks)
3813 rdev->raid_disk = info->raid_disk;
3815 rdev->raid_disk = -1;
3819 if (rdev->raid_disk < mddev->raid_disks)
3820 if (info->state & (1<<MD_DISK_SYNC))
3821 set_bit(In_sync, &rdev->flags);
3823 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3824 set_bit(WriteMostly, &rdev->flags);
3826 if (!mddev->persistent) {
3827 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3828 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3830 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3831 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3833 err = bind_rdev_to_array(rdev, mddev);
3843 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3845 char b[BDEVNAME_SIZE];
3851 rdev = find_rdev(mddev, dev);
3855 if (rdev->raid_disk >= 0)
3858 kick_rdev_from_array(rdev);
3859 md_update_sb(mddev, 1);
3860 md_new_event(mddev);
3864 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3865 bdevname(rdev->bdev,b), mdname(mddev));
3869 static int hot_add_disk(mddev_t * mddev, dev_t dev)
3871 char b[BDEVNAME_SIZE];
3879 if (mddev->major_version != 0) {
3880 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3881 " version-0 superblocks.\n",
3885 if (!mddev->pers->hot_add_disk) {
3887 "%s: personality does not support diskops!\n",
3892 rdev = md_import_device (dev, -1, 0);
3895 "md: error, md_import_device() returned %ld\n",
3900 if (mddev->persistent)
3901 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3904 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3906 size = calc_dev_size(rdev, mddev->chunk_size);
3909 if (test_bit(Faulty, &rdev->flags)) {
3911 "md: can not hot-add faulty %s disk to %s!\n",
3912 bdevname(rdev->bdev,b), mdname(mddev));
3916 clear_bit(In_sync, &rdev->flags);
3918 rdev->saved_raid_disk = -1;
3919 err = bind_rdev_to_array(rdev, mddev);
3924 * The rest should better be atomic, we can have disk failures
3925 * noticed in interrupt contexts ...
3928 if (rdev->desc_nr == mddev->max_disks) {
3929 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3932 goto abort_unbind_export;
3935 rdev->raid_disk = -1;
3937 md_update_sb(mddev, 1);
3940 * Kick recovery, maybe this spare has to be added to the
3941 * array immediately.
3943 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3944 md_wakeup_thread(mddev->thread);
3945 md_new_event(mddev);
3948 abort_unbind_export:
3949 unbind_rdev_from_array(rdev);
3956 static int set_bitmap_file(mddev_t *mddev, int fd)
3961 if (!mddev->pers->quiesce)
3963 if (mddev->recovery || mddev->sync_thread)
3965 /* we should be able to change the bitmap.. */
3971 return -EEXIST; /* cannot add when bitmap is present */
3972 mddev->bitmap_file = fget(fd);
3974 if (mddev->bitmap_file == NULL) {
3975 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3980 err = deny_bitmap_write_access(mddev->bitmap_file);
3982 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3984 fput(mddev->bitmap_file);
3985 mddev->bitmap_file = NULL;
3988 mddev->bitmap_offset = 0; /* file overrides offset */
3989 } else if (mddev->bitmap == NULL)
3990 return -ENOENT; /* cannot remove what isn't there */
3993 mddev->pers->quiesce(mddev, 1);
3995 err = bitmap_create(mddev);
3996 if (fd < 0 || err) {
3997 bitmap_destroy(mddev);
3998 fd = -1; /* make sure to put the file */
4000 mddev->pers->quiesce(mddev, 0);
4003 if (mddev->bitmap_file) {
4004 restore_bitmap_write_access(mddev->bitmap_file);
4005 fput(mddev->bitmap_file);
4007 mddev->bitmap_file = NULL;
4014 * set_array_info is used two different ways
4015 * The original usage is when creating a new array.
4016 * In this usage, raid_disks is > 0 and it together with
4017 * level, size, not_persistent,layout,chunksize determine the
4018 * shape of the array.
4019 * This will always create an array with a type-0.90.0 superblock.
4020 * The newer usage is when assembling an array.
4021 * In this case raid_disks will be 0, and the major_version field is
4022 * use to determine which style super-blocks are to be found on the devices.
4023 * The minor and patch _version numbers are also kept incase the
4024 * super_block handler wishes to interpret them.
4026 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4029 if (info->raid_disks == 0) {
4030 /* just setting version number for superblock loading */
4031 if (info->major_version < 0 ||
4032 info->major_version >= ARRAY_SIZE(super_types) ||
4033 super_types[info->major_version].name == NULL) {
4034 /* maybe try to auto-load a module? */
4036 "md: superblock version %d not known\n",
4037 info->major_version);
4040 mddev->major_version = info->major_version;
4041 mddev->minor_version = info->minor_version;
4042 mddev->patch_version = info->patch_version;
4043 mddev->persistent = !info->not_persistent;
4046 mddev->major_version = MD_MAJOR_VERSION;
4047 mddev->minor_version = MD_MINOR_VERSION;
4048 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4049 mddev->ctime = get_seconds();
4051 mddev->level = info->level;
4052 mddev->clevel[0] = 0;
4053 mddev->size = info->size;
4054 mddev->raid_disks = info->raid_disks;
4055 /* don't set md_minor, it is determined by which /dev/md* was
4058 if (info->state & (1<<MD_SB_CLEAN))
4059 mddev->recovery_cp = MaxSector;
4061 mddev->recovery_cp = 0;
4062 mddev->persistent = ! info->not_persistent;
4064 mddev->layout = info->layout;
4065 mddev->chunk_size = info->chunk_size;
4067 mddev->max_disks = MD_SB_DISKS;
4070 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4072 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4073 mddev->bitmap_offset = 0;
4075 mddev->reshape_position = MaxSector;
4078 * Generate a 128 bit UUID
4080 get_random_bytes(mddev->uuid, 16);
4082 mddev->new_level = mddev->level;
4083 mddev->new_chunk = mddev->chunk_size;
4084 mddev->new_layout = mddev->layout;
4085 mddev->delta_disks = 0;
4090 static int update_size(mddev_t *mddev, unsigned long size)
4094 struct list_head *tmp;
4095 int fit = (size == 0);
4097 if (mddev->pers->resize == NULL)
4099 /* The "size" is the amount of each device that is used.
4100 * This can only make sense for arrays with redundancy.
4101 * linear and raid0 always use whatever space is available
4102 * We can only consider changing the size if no resync
4103 * or reconstruction is happening, and if the new size
4104 * is acceptable. It must fit before the sb_offset or,
4105 * if that is <data_offset, it must fit before the
4106 * size of each device.
4107 * If size is zero, we find the largest size that fits.
4109 if (mddev->sync_thread)
4111 ITERATE_RDEV(mddev,rdev,tmp) {
4113 avail = rdev->size * 2;
4115 if (fit && (size == 0 || size > avail/2))
4117 if (avail < ((sector_t)size << 1))
4120 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4122 struct block_device *bdev;
4124 bdev = bdget_disk(mddev->gendisk, 0);
4126 mutex_lock(&bdev->bd_inode->i_mutex);
4127 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
4128 mutex_unlock(&bdev->bd_inode->i_mutex);
4135 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4138 /* change the number of raid disks */
4139 if (mddev->pers->check_reshape == NULL)
4141 if (raid_disks <= 0 ||
4142 raid_disks >= mddev->max_disks)
4144 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4146 mddev->delta_disks = raid_disks - mddev->raid_disks;
4148 rv = mddev->pers->check_reshape(mddev);
4154 * update_array_info is used to change the configuration of an
4156 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4157 * fields in the info are checked against the array.
4158 * Any differences that cannot be handled will cause an error.
4159 * Normally, only one change can be managed at a time.
4161 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4167 /* calculate expected state,ignoring low bits */
4168 if (mddev->bitmap && mddev->bitmap_offset)
4169 state |= (1 << MD_SB_BITMAP_PRESENT);
4171 if (mddev->major_version != info->major_version ||
4172 mddev->minor_version != info->minor_version ||
4173 /* mddev->patch_version != info->patch_version || */
4174 mddev->ctime != info->ctime ||
4175 mddev->level != info->level ||
4176 /* mddev->layout != info->layout || */
4177 !mddev->persistent != info->not_persistent||
4178 mddev->chunk_size != info->chunk_size ||
4179 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4180 ((state^info->state) & 0xfffffe00)
4183 /* Check there is only one change */
4184 if (info->size >= 0 && mddev->size != info->size) cnt++;
4185 if (mddev->raid_disks != info->raid_disks) cnt++;
4186 if (mddev->layout != info->layout) cnt++;
4187 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4188 if (cnt == 0) return 0;
4189 if (cnt > 1) return -EINVAL;
4191 if (mddev->layout != info->layout) {
4193 * we don't need to do anything at the md level, the
4194 * personality will take care of it all.
4196 if (mddev->pers->reconfig == NULL)
4199 return mddev->pers->reconfig(mddev, info->layout, -1);
4201 if (info->size >= 0 && mddev->size != info->size)
4202 rv = update_size(mddev, info->size);
4204 if (mddev->raid_disks != info->raid_disks)
4205 rv = update_raid_disks(mddev, info->raid_disks);
4207 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4208 if (mddev->pers->quiesce == NULL)
4210 if (mddev->recovery || mddev->sync_thread)
4212 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4213 /* add the bitmap */
4216 if (mddev->default_bitmap_offset == 0)
4218 mddev->bitmap_offset = mddev->default_bitmap_offset;
4219 mddev->pers->quiesce(mddev, 1);
4220 rv = bitmap_create(mddev);
4222 bitmap_destroy(mddev);
4223 mddev->pers->quiesce(mddev, 0);
4225 /* remove the bitmap */
4228 if (mddev->bitmap->file)
4230 mddev->pers->quiesce(mddev, 1);
4231 bitmap_destroy(mddev);
4232 mddev->pers->quiesce(mddev, 0);
4233 mddev->bitmap_offset = 0;
4236 md_update_sb(mddev, 1);
4240 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4244 if (mddev->pers == NULL)
4247 rdev = find_rdev(mddev, dev);
4251 md_error(mddev, rdev);
4255 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4257 mddev_t *mddev = bdev->bd_disk->private_data;
4261 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4265 static int md_ioctl(struct inode *inode, struct file *file,
4266 unsigned int cmd, unsigned long arg)
4269 void __user *argp = (void __user *)arg;
4270 mddev_t *mddev = NULL;
4272 if (!capable(CAP_SYS_ADMIN))
4276 * Commands dealing with the RAID driver but not any
4282 err = get_version(argp);
4285 case PRINT_RAID_DEBUG:
4293 autostart_arrays(arg);
4300 * Commands creating/starting a new array:
4303 mddev = inode->i_bdev->bd_disk->private_data;
4310 err = mddev_lock(mddev);
4313 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4320 case SET_ARRAY_INFO:
4322 mdu_array_info_t info;
4324 memset(&info, 0, sizeof(info));
4325 else if (copy_from_user(&info, argp, sizeof(info))) {
4330 err = update_array_info(mddev, &info);
4332 printk(KERN_WARNING "md: couldn't update"
4333 " array info. %d\n", err);
4338 if (!list_empty(&mddev->disks)) {
4340 "md: array %s already has disks!\n",
4345 if (mddev->raid_disks) {
4347 "md: array %s already initialised!\n",
4352 err = set_array_info(mddev, &info);
4354 printk(KERN_WARNING "md: couldn't set"
4355 " array info. %d\n", err);
4365 * Commands querying/configuring an existing array:
4367 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4368 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4369 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4370 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4371 && cmd != GET_BITMAP_FILE) {
4377 * Commands even a read-only array can execute:
4381 case GET_ARRAY_INFO:
4382 err = get_array_info(mddev, argp);
4385 case GET_BITMAP_FILE:
4386 err = get_bitmap_file(mddev, argp);
4390 err = get_disk_info(mddev, argp);
4393 case RESTART_ARRAY_RW:
4394 err = restart_array(mddev);
4398 err = do_md_stop (mddev, 0);
4402 err = do_md_stop (mddev, 1);
4406 * We have a problem here : there is no easy way to give a CHS
4407 * virtual geometry. We currently pretend that we have a 2 heads
4408 * 4 sectors (with a BIG number of cylinders...). This drives
4409 * dosfs just mad... ;-)
4414 * The remaining ioctls are changing the state of the
4415 * superblock, so we do not allow them on read-only arrays.
4416 * However non-MD ioctls (e.g. get-size) will still come through
4417 * here and hit the 'default' below, so only disallow
4418 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4420 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4421 mddev->ro && mddev->pers) {
4422 if (mddev->ro == 2) {
4424 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4425 md_wakeup_thread(mddev->thread);
4437 mdu_disk_info_t info;
4438 if (copy_from_user(&info, argp, sizeof(info)))
4441 err = add_new_disk(mddev, &info);
4445 case HOT_REMOVE_DISK:
4446 err = hot_remove_disk(mddev, new_decode_dev(arg));
4450 err = hot_add_disk(mddev, new_decode_dev(arg));
4453 case SET_DISK_FAULTY:
4454 err = set_disk_faulty(mddev, new_decode_dev(arg));
4458 err = do_md_run (mddev);
4461 case SET_BITMAP_FILE:
4462 err = set_bitmap_file(mddev, (int)arg);
4472 mddev_unlock(mddev);
4482 static int md_open(struct inode *inode, struct file *file)
4485 * Succeed if we can lock the mddev, which confirms that
4486 * it isn't being stopped right now.
4488 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4491 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
4496 mddev_unlock(mddev);
4498 check_disk_change(inode->i_bdev);
4503 static int md_release(struct inode *inode, struct file * file)
4505 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4513 static int md_media_changed(struct gendisk *disk)
4515 mddev_t *mddev = disk->private_data;
4517 return mddev->changed;
4520 static int md_revalidate(struct gendisk *disk)
4522 mddev_t *mddev = disk->private_data;
4527 static struct block_device_operations md_fops =
4529 .owner = THIS_MODULE,
4531 .release = md_release,
4533 .getgeo = md_getgeo,
4534 .media_changed = md_media_changed,
4535 .revalidate_disk= md_revalidate,
4538 static int md_thread(void * arg)
4540 mdk_thread_t *thread = arg;
4543 * md_thread is a 'system-thread', it's priority should be very
4544 * high. We avoid resource deadlocks individually in each
4545 * raid personality. (RAID5 does preallocation) We also use RR and
4546 * the very same RT priority as kswapd, thus we will never get
4547 * into a priority inversion deadlock.
4549 * we definitely have to have equal or higher priority than
4550 * bdflush, otherwise bdflush will deadlock if there are too
4551 * many dirty RAID5 blocks.
4554 current->flags |= PF_NOFREEZE;
4555 allow_signal(SIGKILL);
4556 while (!kthread_should_stop()) {
4558 /* We need to wait INTERRUPTIBLE so that
4559 * we don't add to the load-average.
4560 * That means we need to be sure no signals are
4563 if (signal_pending(current))
4564 flush_signals(current);
4566 wait_event_interruptible_timeout
4568 test_bit(THREAD_WAKEUP, &thread->flags)
4569 || kthread_should_stop(),
4572 clear_bit(THREAD_WAKEUP, &thread->flags);
4574 thread->run(thread->mddev);
4580 void md_wakeup_thread(mdk_thread_t *thread)
4583 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4584 set_bit(THREAD_WAKEUP, &thread->flags);
4585 wake_up(&thread->wqueue);
4589 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4592 mdk_thread_t *thread;
4594 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
4598 init_waitqueue_head(&thread->wqueue);
4601 thread->mddev = mddev;
4602 thread->timeout = MAX_SCHEDULE_TIMEOUT;
4603 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
4604 if (IS_ERR(thread->tsk)) {
4611 void md_unregister_thread(mdk_thread_t *thread)
4613 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
4615 kthread_stop(thread->tsk);
4619 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4626 if (!rdev || test_bit(Faulty, &rdev->flags))
4629 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4631 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4632 __builtin_return_address(0),__builtin_return_address(1),
4633 __builtin_return_address(2),__builtin_return_address(3));
4637 if (!mddev->pers->error_handler)
4639 mddev->pers->error_handler(mddev,rdev);
4640 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4641 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4642 md_wakeup_thread(mddev->thread);
4643 md_new_event_inintr(mddev);
4646 /* seq_file implementation /proc/mdstat */
4648 static void status_unused(struct seq_file *seq)
4652 struct list_head *tmp;
4654 seq_printf(seq, "unused devices: ");
4656 ITERATE_RDEV_PENDING(rdev,tmp) {
4657 char b[BDEVNAME_SIZE];
4659 seq_printf(seq, "%s ",
4660 bdevname(rdev->bdev,b));
4663 seq_printf(seq, "<none>");
4665 seq_printf(seq, "\n");
4669 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4671 sector_t max_blocks, resync, res;
4672 unsigned long dt, db, rt;
4674 unsigned int per_milli;
4676 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4678 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4679 max_blocks = mddev->resync_max_sectors >> 1;
4681 max_blocks = mddev->size;
4684 * Should not happen.
4690 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4691 * in a sector_t, and (max_blocks>>scale) will fit in a
4692 * u32, as those are the requirements for sector_div.
4693 * Thus 'scale' must be at least 10
4696 if (sizeof(sector_t) > sizeof(unsigned long)) {
4697 while ( max_blocks/2 > (1ULL<<(scale+32)))
4700 res = (resync>>scale)*1000;
4701 sector_div(res, (u32)((max_blocks>>scale)+1));
4705 int i, x = per_milli/50, y = 20-x;
4706 seq_printf(seq, "[");
4707 for (i = 0; i < x; i++)
4708 seq_printf(seq, "=");
4709 seq_printf(seq, ">");
4710 for (i = 0; i < y; i++)
4711 seq_printf(seq, ".");
4712 seq_printf(seq, "] ");
4714 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
4715 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4717 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4719 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4720 "resync" : "recovery"))),
4721 per_milli/10, per_milli % 10,
4722 (unsigned long long) resync,
4723 (unsigned long long) max_blocks);
4726 * We do not want to overflow, so the order of operands and
4727 * the * 100 / 100 trick are important. We do a +1 to be
4728 * safe against division by zero. We only estimate anyway.
4730 * dt: time from mark until now
4731 * db: blocks written from mark until now
4732 * rt: remaining time
4734 dt = ((jiffies - mddev->resync_mark) / HZ);
4736 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4737 - mddev->resync_mark_cnt;
4738 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
4740 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4742 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
4745 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4747 struct list_head *tmp;
4757 spin_lock(&all_mddevs_lock);
4758 list_for_each(tmp,&all_mddevs)
4760 mddev = list_entry(tmp, mddev_t, all_mddevs);
4762 spin_unlock(&all_mddevs_lock);
4765 spin_unlock(&all_mddevs_lock);
4767 return (void*)2;/* tail */
4771 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4773 struct list_head *tmp;
4774 mddev_t *next_mddev, *mddev = v;
4780 spin_lock(&all_mddevs_lock);
4782 tmp = all_mddevs.next;
4784 tmp = mddev->all_mddevs.next;
4785 if (tmp != &all_mddevs)
4786 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4788 next_mddev = (void*)2;
4791 spin_unlock(&all_mddevs_lock);
4799 static void md_seq_stop(struct seq_file *seq, void *v)
4803 if (mddev && v != (void*)1 && v != (void*)2)
4807 struct mdstat_info {
4811 static int md_seq_show(struct seq_file *seq, void *v)
4815 struct list_head *tmp2;
4817 struct mdstat_info *mi = seq->private;
4818 struct bitmap *bitmap;
4820 if (v == (void*)1) {
4821 struct mdk_personality *pers;
4822 seq_printf(seq, "Personalities : ");
4823 spin_lock(&pers_lock);
4824 list_for_each_entry(pers, &pers_list, list)
4825 seq_printf(seq, "[%s] ", pers->name);
4827 spin_unlock(&pers_lock);
4828 seq_printf(seq, "\n");
4829 mi->event = atomic_read(&md_event_count);
4832 if (v == (void*)2) {
4837 if (mddev_lock(mddev) < 0)
4840 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4841 seq_printf(seq, "%s : %sactive", mdname(mddev),
4842 mddev->pers ? "" : "in");
4845 seq_printf(seq, " (read-only)");
4847 seq_printf(seq, "(auto-read-only)");
4848 seq_printf(seq, " %s", mddev->pers->name);
4852 ITERATE_RDEV(mddev,rdev,tmp2) {
4853 char b[BDEVNAME_SIZE];
4854 seq_printf(seq, " %s[%d]",
4855 bdevname(rdev->bdev,b), rdev->desc_nr);
4856 if (test_bit(WriteMostly, &rdev->flags))
4857 seq_printf(seq, "(W)");
4858 if (test_bit(Faulty, &rdev->flags)) {
4859 seq_printf(seq, "(F)");
4861 } else if (rdev->raid_disk < 0)
4862 seq_printf(seq, "(S)"); /* spare */
4866 if (!list_empty(&mddev->disks)) {
4868 seq_printf(seq, "\n %llu blocks",
4869 (unsigned long long)mddev->array_size);
4871 seq_printf(seq, "\n %llu blocks",
4872 (unsigned long long)size);
4874 if (mddev->persistent) {
4875 if (mddev->major_version != 0 ||
4876 mddev->minor_version != 90) {
4877 seq_printf(seq," super %d.%d",
4878 mddev->major_version,
4879 mddev->minor_version);
4882 seq_printf(seq, " super non-persistent");
4885 mddev->pers->status (seq, mddev);
4886 seq_printf(seq, "\n ");
4887 if (mddev->pers->sync_request) {
4888 if (mddev->curr_resync > 2) {
4889 status_resync (seq, mddev);
4890 seq_printf(seq, "\n ");
4891 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4892 seq_printf(seq, "\tresync=DELAYED\n ");
4893 else if (mddev->recovery_cp < MaxSector)
4894 seq_printf(seq, "\tresync=PENDING\n ");
4897 seq_printf(seq, "\n ");
4899 if ((bitmap = mddev->bitmap)) {
4900 unsigned long chunk_kb;
4901 unsigned long flags;
4902 spin_lock_irqsave(&bitmap->lock, flags);
4903 chunk_kb = bitmap->chunksize >> 10;
4904 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4906 bitmap->pages - bitmap->missing_pages,
4908 (bitmap->pages - bitmap->missing_pages)
4909 << (PAGE_SHIFT - 10),
4910 chunk_kb ? chunk_kb : bitmap->chunksize,
4911 chunk_kb ? "KB" : "B");
4913 seq_printf(seq, ", file: ");
4914 seq_path(seq, bitmap->file->f_path.mnt,
4915 bitmap->file->f_path.dentry," \t\n");
4918 seq_printf(seq, "\n");
4919 spin_unlock_irqrestore(&bitmap->lock, flags);
4922 seq_printf(seq, "\n");
4924 mddev_unlock(mddev);
4929 static struct seq_operations md_seq_ops = {
4930 .start = md_seq_start,
4931 .next = md_seq_next,
4932 .stop = md_seq_stop,
4933 .show = md_seq_show,
4936 static int md_seq_open(struct inode *inode, struct file *file)
4939 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4943 error = seq_open(file, &md_seq_ops);
4947 struct seq_file *p = file->private_data;
4949 mi->event = atomic_read(&md_event_count);
4954 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4956 struct seq_file *m = filp->private_data;
4957 struct mdstat_info *mi = m->private;
4960 poll_wait(filp, &md_event_waiters, wait);
4962 /* always allow read */
4963 mask = POLLIN | POLLRDNORM;
4965 if (mi->event != atomic_read(&md_event_count))
4966 mask |= POLLERR | POLLPRI;
4970 static const struct file_operations md_seq_fops = {
4971 .owner = THIS_MODULE,
4972 .open = md_seq_open,
4974 .llseek = seq_lseek,
4975 .release = seq_release_private,
4976 .poll = mdstat_poll,
4979 int register_md_personality(struct mdk_personality *p)
4981 spin_lock(&pers_lock);
4982 list_add_tail(&p->list, &pers_list);
4983 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
4984 spin_unlock(&pers_lock);
4988 int unregister_md_personality(struct mdk_personality *p)
4990 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
4991 spin_lock(&pers_lock);
4992 list_del_init(&p->list);
4993 spin_unlock(&pers_lock);
4997 static int is_mddev_idle(mddev_t *mddev)
5000 struct list_head *tmp;
5002 unsigned long curr_events;
5005 ITERATE_RDEV(mddev,rdev,tmp) {
5006 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5007 curr_events = disk_stat_read(disk, sectors[0]) +
5008 disk_stat_read(disk, sectors[1]) -
5009 atomic_read(&disk->sync_io);
5010 /* The difference between curr_events and last_events
5011 * will be affected by any new non-sync IO (making
5012 * curr_events bigger) and any difference in the amount of
5013 * in-flight syncio (making current_events bigger or smaller)
5014 * The amount in-flight is currently limited to
5015 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
5016 * which is at most 4096 sectors.
5017 * These numbers are fairly fragile and should be made
5018 * more robust, probably by enforcing the
5019 * 'window size' that md_do_sync sort-of uses.
5021 * Note: the following is an unsigned comparison.
5023 if ((curr_events - rdev->last_events + 4096) > 8192) {
5024 rdev->last_events = curr_events;
5031 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5033 /* another "blocks" (512byte) blocks have been synced */
5034 atomic_sub(blocks, &mddev->recovery_active);
5035 wake_up(&mddev->recovery_wait);
5037 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5038 md_wakeup_thread(mddev->thread);
5039 // stop recovery, signal do_sync ....
5044 /* md_write_start(mddev, bi)
5045 * If we need to update some array metadata (e.g. 'active' flag
5046 * in superblock) before writing, schedule a superblock update
5047 * and wait for it to complete.
5049 void md_write_start(mddev_t *mddev, struct bio *bi)
5051 if (bio_data_dir(bi) != WRITE)
5054 BUG_ON(mddev->ro == 1);
5055 if (mddev->ro == 2) {
5056 /* need to switch to read/write */
5058 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5059 md_wakeup_thread(mddev->thread);
5061 atomic_inc(&mddev->writes_pending);
5062 if (mddev->in_sync) {
5063 spin_lock_irq(&mddev->write_lock);
5064 if (mddev->in_sync) {
5066 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5067 md_wakeup_thread(mddev->thread);
5069 spin_unlock_irq(&mddev->write_lock);
5071 wait_event(mddev->sb_wait, mddev->flags==0);
5074 void md_write_end(mddev_t *mddev)
5076 if (atomic_dec_and_test(&mddev->writes_pending)) {
5077 if (mddev->safemode == 2)
5078 md_wakeup_thread(mddev->thread);
5079 else if (mddev->safemode_delay)
5080 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5084 /* md_allow_write(mddev)
5085 * Calling this ensures that the array is marked 'active' so that writes
5086 * may proceed without blocking. It is important to call this before
5087 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5088 * Must be called with mddev_lock held.
5090 void md_allow_write(mddev_t *mddev)
5097 spin_lock_irq(&mddev->write_lock);
5098 if (mddev->in_sync) {
5100 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5101 if (mddev->safemode_delay &&
5102 mddev->safemode == 0)
5103 mddev->safemode = 1;
5104 spin_unlock_irq(&mddev->write_lock);
5105 md_update_sb(mddev, 0);
5107 spin_unlock_irq(&mddev->write_lock);
5109 EXPORT_SYMBOL_GPL(md_allow_write);
5111 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
5113 #define SYNC_MARKS 10
5114 #define SYNC_MARK_STEP (3*HZ)
5115 void md_do_sync(mddev_t *mddev)
5118 unsigned int currspeed = 0,
5120 sector_t max_sectors,j, io_sectors;
5121 unsigned long mark[SYNC_MARKS];
5122 sector_t mark_cnt[SYNC_MARKS];
5124 struct list_head *tmp;
5125 sector_t last_check;
5127 struct list_head *rtmp;
5131 /* just incase thread restarts... */
5132 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5134 if (mddev->ro) /* never try to sync a read-only array */
5137 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5138 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5139 desc = "data-check";
5140 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5141 desc = "requested-resync";
5144 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5149 /* we overload curr_resync somewhat here.
5150 * 0 == not engaged in resync at all
5151 * 2 == checking that there is no conflict with another sync
5152 * 1 == like 2, but have yielded to allow conflicting resync to
5154 * other == active in resync - this many blocks
5156 * Before starting a resync we must have set curr_resync to
5157 * 2, and then checked that every "conflicting" array has curr_resync
5158 * less than ours. When we find one that is the same or higher
5159 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5160 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5161 * This will mean we have to start checking from the beginning again.
5166 mddev->curr_resync = 2;
5169 if (kthread_should_stop()) {
5170 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5173 ITERATE_MDDEV(mddev2,tmp) {
5174 if (mddev2 == mddev)
5176 if (mddev2->curr_resync &&
5177 match_mddev_units(mddev,mddev2)) {
5179 if (mddev < mddev2 && mddev->curr_resync == 2) {
5180 /* arbitrarily yield */
5181 mddev->curr_resync = 1;
5182 wake_up(&resync_wait);
5184 if (mddev > mddev2 && mddev->curr_resync == 1)
5185 /* no need to wait here, we can wait the next
5186 * time 'round when curr_resync == 2
5189 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5190 if (!kthread_should_stop() &&
5191 mddev2->curr_resync >= mddev->curr_resync) {
5192 printk(KERN_INFO "md: delaying %s of %s"
5193 " until %s has finished (they"
5194 " share one or more physical units)\n",
5195 desc, mdname(mddev), mdname(mddev2));
5198 finish_wait(&resync_wait, &wq);
5201 finish_wait(&resync_wait, &wq);
5204 } while (mddev->curr_resync < 2);
5207 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5208 /* resync follows the size requested by the personality,
5209 * which defaults to physical size, but can be virtual size
5211 max_sectors = mddev->resync_max_sectors;
5212 mddev->resync_mismatches = 0;
5213 /* we don't use the checkpoint if there's a bitmap */
5214 if (!mddev->bitmap &&
5215 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5216 j = mddev->recovery_cp;
5217 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5218 max_sectors = mddev->size << 1;
5220 /* recovery follows the physical size of devices */
5221 max_sectors = mddev->size << 1;
5223 ITERATE_RDEV(mddev,rdev,rtmp)
5224 if (rdev->raid_disk >= 0 &&
5225 !test_bit(Faulty, &rdev->flags) &&
5226 !test_bit(In_sync, &rdev->flags) &&
5227 rdev->recovery_offset < j)
5228 j = rdev->recovery_offset;
5231 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5232 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5233 " %d KB/sec/disk.\n", speed_min(mddev));
5234 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5235 "(but not more than %d KB/sec) for %s.\n",
5236 speed_max(mddev), desc);
5238 is_mddev_idle(mddev); /* this also initializes IO event counters */
5241 for (m = 0; m < SYNC_MARKS; m++) {
5243 mark_cnt[m] = io_sectors;
5246 mddev->resync_mark = mark[last_mark];
5247 mddev->resync_mark_cnt = mark_cnt[last_mark];
5250 * Tune reconstruction:
5252 window = 32*(PAGE_SIZE/512);
5253 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5254 window/2,(unsigned long long) max_sectors/2);
5256 atomic_set(&mddev->recovery_active, 0);
5257 init_waitqueue_head(&mddev->recovery_wait);
5262 "md: resuming %s of %s from checkpoint.\n",
5263 desc, mdname(mddev));
5264 mddev->curr_resync = j;
5267 while (j < max_sectors) {
5271 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5272 currspeed < speed_min(mddev));
5274 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5278 if (!skipped) { /* actual IO requested */
5279 io_sectors += sectors;
5280 atomic_add(sectors, &mddev->recovery_active);
5284 if (j>1) mddev->curr_resync = j;
5285 mddev->curr_mark_cnt = io_sectors;
5286 if (last_check == 0)
5287 /* this is the earliers that rebuilt will be
5288 * visible in /proc/mdstat
5290 md_new_event(mddev);
5292 if (last_check + window > io_sectors || j == max_sectors)
5295 last_check = io_sectors;
5297 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5298 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5302 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5304 int next = (last_mark+1) % SYNC_MARKS;
5306 mddev->resync_mark = mark[next];
5307 mddev->resync_mark_cnt = mark_cnt[next];
5308 mark[next] = jiffies;
5309 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5314 if (kthread_should_stop()) {
5316 * got a signal, exit.
5319 "md: md_do_sync() got signal ... exiting\n");
5320 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5325 * this loop exits only if either when we are slower than
5326 * the 'hard' speed limit, or the system was IO-idle for
5328 * the system might be non-idle CPU-wise, but we only care
5329 * about not overloading the IO subsystem. (things like an
5330 * e2fsck being done on the RAID array should execute fast)
5332 mddev->queue->unplug_fn(mddev->queue);
5335 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5336 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5338 if (currspeed > speed_min(mddev)) {
5339 if ((currspeed > speed_max(mddev)) ||
5340 !is_mddev_idle(mddev)) {
5346 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5348 * this also signals 'finished resyncing' to md_stop
5351 mddev->queue->unplug_fn(mddev->queue);
5353 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5355 /* tell personality that we are finished */
5356 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5358 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5359 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5360 mddev->curr_resync > 2) {
5361 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5362 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5363 if (mddev->curr_resync >= mddev->recovery_cp) {
5365 "md: checkpointing %s of %s.\n",
5366 desc, mdname(mddev));
5367 mddev->recovery_cp = mddev->curr_resync;
5370 mddev->recovery_cp = MaxSector;
5372 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5373 mddev->curr_resync = MaxSector;
5374 ITERATE_RDEV(mddev,rdev,rtmp)
5375 if (rdev->raid_disk >= 0 &&
5376 !test_bit(Faulty, &rdev->flags) &&
5377 !test_bit(In_sync, &rdev->flags) &&
5378 rdev->recovery_offset < mddev->curr_resync)
5379 rdev->recovery_offset = mddev->curr_resync;
5382 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5385 mddev->curr_resync = 0;
5386 wake_up(&resync_wait);
5387 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5388 md_wakeup_thread(mddev->thread);
5390 EXPORT_SYMBOL_GPL(md_do_sync);
5393 static int remove_and_add_spares(mddev_t *mddev)
5396 struct list_head *rtmp;
5399 ITERATE_RDEV(mddev,rdev,rtmp)
5400 if (rdev->raid_disk >= 0 &&
5401 (test_bit(Faulty, &rdev->flags) ||
5402 ! test_bit(In_sync, &rdev->flags)) &&
5403 atomic_read(&rdev->nr_pending)==0) {
5404 if (mddev->pers->hot_remove_disk(
5405 mddev, rdev->raid_disk)==0) {
5407 sprintf(nm,"rd%d", rdev->raid_disk);
5408 sysfs_remove_link(&mddev->kobj, nm);
5409 rdev->raid_disk = -1;
5413 if (mddev->degraded) {
5414 ITERATE_RDEV(mddev,rdev,rtmp)
5415 if (rdev->raid_disk < 0
5416 && !test_bit(Faulty, &rdev->flags)) {
5417 rdev->recovery_offset = 0;
5418 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5420 sprintf(nm, "rd%d", rdev->raid_disk);
5421 if (sysfs_create_link(&mddev->kobj,
5424 "md: cannot register "
5428 md_new_event(mddev);
5436 * This routine is regularly called by all per-raid-array threads to
5437 * deal with generic issues like resync and super-block update.
5438 * Raid personalities that don't have a thread (linear/raid0) do not
5439 * need this as they never do any recovery or update the superblock.
5441 * It does not do any resync itself, but rather "forks" off other threads
5442 * to do that as needed.
5443 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5444 * "->recovery" and create a thread at ->sync_thread.
5445 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5446 * and wakeups up this thread which will reap the thread and finish up.
5447 * This thread also removes any faulty devices (with nr_pending == 0).
5449 * The overall approach is:
5450 * 1/ if the superblock needs updating, update it.
5451 * 2/ If a recovery thread is running, don't do anything else.
5452 * 3/ If recovery has finished, clean up, possibly marking spares active.
5453 * 4/ If there are any faulty devices, remove them.
5454 * 5/ If array is degraded, try to add spares devices
5455 * 6/ If array has spares or is not in-sync, start a resync thread.
5457 void md_check_recovery(mddev_t *mddev)
5460 struct list_head *rtmp;
5464 bitmap_daemon_work(mddev->bitmap);
5469 if (signal_pending(current)) {
5470 if (mddev->pers->sync_request) {
5471 printk(KERN_INFO "md: %s in immediate safe mode\n",
5473 mddev->safemode = 2;
5475 flush_signals(current);
5480 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
5481 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5482 (mddev->safemode == 1) ||
5483 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5484 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
5488 if (mddev_trylock(mddev)) {
5491 spin_lock_irq(&mddev->write_lock);
5492 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5493 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5495 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5497 if (mddev->safemode == 1)
5498 mddev->safemode = 0;
5499 spin_unlock_irq(&mddev->write_lock);
5502 md_update_sb(mddev, 0);
5505 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5506 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5507 /* resync/recovery still happening */
5508 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5511 if (mddev->sync_thread) {
5512 /* resync has finished, collect result */
5513 md_unregister_thread(mddev->sync_thread);
5514 mddev->sync_thread = NULL;
5515 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5516 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5518 /* activate any spares */
5519 mddev->pers->spare_active(mddev);
5521 md_update_sb(mddev, 1);
5523 /* if array is no-longer degraded, then any saved_raid_disk
5524 * information must be scrapped
5526 if (!mddev->degraded)
5527 ITERATE_RDEV(mddev,rdev,rtmp)
5528 rdev->saved_raid_disk = -1;
5530 mddev->recovery = 0;
5531 /* flag recovery needed just to double check */
5532 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5533 md_new_event(mddev);
5536 /* Clear some bits that don't mean anything, but
5539 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5540 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5541 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5542 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
5544 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5546 /* no recovery is running.
5547 * remove any failed drives, then
5548 * add spares if possible.
5549 * Spare are also removed and re-added, to allow
5550 * the personality to fail the re-add.
5553 if (mddev->reshape_position != MaxSector) {
5554 if (mddev->pers->check_reshape(mddev) != 0)
5555 /* Cannot proceed */
5557 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5558 } else if ((spares = remove_and_add_spares(mddev))) {
5559 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5560 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5561 } else if (mddev->recovery_cp < MaxSector) {
5562 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5563 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5564 /* nothing to be done ... */
5567 if (mddev->pers->sync_request) {
5568 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
5569 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5570 /* We are adding a device or devices to an array
5571 * which has the bitmap stored on all devices.
5572 * So make sure all bitmap pages get written
5574 bitmap_write_all(mddev->bitmap);
5576 mddev->sync_thread = md_register_thread(md_do_sync,
5579 if (!mddev->sync_thread) {
5580 printk(KERN_ERR "%s: could not start resync"
5583 /* leave the spares where they are, it shouldn't hurt */
5584 mddev->recovery = 0;
5586 md_wakeup_thread(mddev->sync_thread);
5587 md_new_event(mddev);
5590 mddev_unlock(mddev);
5594 static int md_notify_reboot(struct notifier_block *this,
5595 unsigned long code, void *x)
5597 struct list_head *tmp;
5600 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5602 printk(KERN_INFO "md: stopping all md devices.\n");
5604 ITERATE_MDDEV(mddev,tmp)
5605 if (mddev_trylock(mddev)) {
5606 do_md_stop (mddev, 1);
5607 mddev_unlock(mddev);
5610 * certain more exotic SCSI devices are known to be
5611 * volatile wrt too early system reboots. While the
5612 * right place to handle this issue is the given
5613 * driver, we do want to have a safe RAID driver ...
5620 static struct notifier_block md_notifier = {
5621 .notifier_call = md_notify_reboot,
5623 .priority = INT_MAX, /* before any real devices */
5626 static void md_geninit(void)
5628 struct proc_dir_entry *p;
5630 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5632 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5634 p->proc_fops = &md_seq_fops;
5637 static int __init md_init(void)
5639 if (register_blkdev(MAJOR_NR, "md"))
5641 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5642 unregister_blkdev(MAJOR_NR, "md");
5645 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5646 md_probe, NULL, NULL);
5647 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
5648 md_probe, NULL, NULL);
5650 register_reboot_notifier(&md_notifier);
5651 raid_table_header = register_sysctl_table(raid_root_table);
5661 * Searches all registered partitions for autorun RAID arrays
5664 static dev_t detected_devices[128];
5667 void md_autodetect_dev(dev_t dev)
5669 if (dev_cnt >= 0 && dev_cnt < 127)
5670 detected_devices[dev_cnt++] = dev;
5674 static void autostart_arrays(int part)
5679 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5681 for (i = 0; i < dev_cnt; i++) {
5682 dev_t dev = detected_devices[i];
5684 rdev = md_import_device(dev,0, 0);
5688 if (test_bit(Faulty, &rdev->flags)) {
5692 list_add(&rdev->same_set, &pending_raid_disks);
5696 autorun_devices(part);
5699 #endif /* !MODULE */
5701 static __exit void md_exit(void)
5704 struct list_head *tmp;
5706 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
5707 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
5709 unregister_blkdev(MAJOR_NR,"md");
5710 unregister_blkdev(mdp_major, "mdp");
5711 unregister_reboot_notifier(&md_notifier);
5712 unregister_sysctl_table(raid_table_header);
5713 remove_proc_entry("mdstat", NULL);
5714 ITERATE_MDDEV(mddev,tmp) {
5715 struct gendisk *disk = mddev->gendisk;
5718 export_array(mddev);
5721 mddev->gendisk = NULL;
5726 module_init(md_init)
5727 module_exit(md_exit)
5729 static int get_ro(char *buffer, struct kernel_param *kp)
5731 return sprintf(buffer, "%d", start_readonly);
5733 static int set_ro(const char *val, struct kernel_param *kp)
5736 int num = simple_strtoul(val, &e, 10);
5737 if (*val && (*e == '\0' || *e == '\n')) {
5738 start_readonly = num;
5744 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
5745 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
5748 EXPORT_SYMBOL(register_md_personality);
5749 EXPORT_SYMBOL(unregister_md_personality);
5750 EXPORT_SYMBOL(md_error);
5751 EXPORT_SYMBOL(md_done_sync);
5752 EXPORT_SYMBOL(md_write_start);
5753 EXPORT_SYMBOL(md_write_end);
5754 EXPORT_SYMBOL(md_register_thread);
5755 EXPORT_SYMBOL(md_unregister_thread);
5756 EXPORT_SYMBOL(md_wakeup_thread);
5757 EXPORT_SYMBOL(md_check_recovery);
5758 MODULE_LICENSE("GPL");
5760 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);