2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/buffer_head.h> /* for invalidate_bdev */
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/ctype.h>
46 #include <linux/freezer.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part);
72 static LIST_HEAD(pers_list);
73 static DEFINE_SPINLOCK(pers_lock);
75 static void md_print_devices(void);
77 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
80 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
81 * is 1000 KB/sec, so the extra system load does not show up that much.
82 * Increase it if you want to have more _guaranteed_ speed. Note that
83 * the RAID driver will use the maximum available bandwidth if the IO
84 * subsystem is idle. There is also an 'absolute maximum' reconstruction
85 * speed limit - in case reconstruction slows down your system despite
88 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
89 * or /sys/block/mdX/md/sync_speed_{min,max}
92 static int sysctl_speed_limit_min = 1000;
93 static int sysctl_speed_limit_max = 200000;
94 static inline int speed_min(mddev_t *mddev)
96 return mddev->sync_speed_min ?
97 mddev->sync_speed_min : sysctl_speed_limit_min;
100 static inline int speed_max(mddev_t *mddev)
102 return mddev->sync_speed_max ?
103 mddev->sync_speed_max : sysctl_speed_limit_max;
106 static struct ctl_table_header *raid_table_header;
108 static ctl_table raid_table[] = {
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
111 .procname = "speed_limit_min",
112 .data = &sysctl_speed_limit_min,
113 .maxlen = sizeof(int),
114 .mode = S_IRUGO|S_IWUSR,
115 .proc_handler = &proc_dointvec,
118 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
119 .procname = "speed_limit_max",
120 .data = &sysctl_speed_limit_max,
121 .maxlen = sizeof(int),
122 .mode = S_IRUGO|S_IWUSR,
123 .proc_handler = &proc_dointvec,
128 static ctl_table raid_dir_table[] = {
130 .ctl_name = DEV_RAID,
133 .mode = S_IRUGO|S_IXUGO,
139 static ctl_table raid_root_table[] = {
145 .child = raid_dir_table,
150 static struct block_device_operations md_fops;
152 static int start_readonly;
155 * We have a system wide 'event count' that is incremented
156 * on any 'interesting' event, and readers of /proc/mdstat
157 * can use 'poll' or 'select' to find out when the event
161 * start array, stop array, error, add device, remove device,
162 * start build, activate spare
164 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
165 static atomic_t md_event_count;
166 void md_new_event(mddev_t *mddev)
168 atomic_inc(&md_event_count);
169 wake_up(&md_event_waiters);
170 sysfs_notify(&mddev->kobj, NULL, "sync_action");
172 EXPORT_SYMBOL_GPL(md_new_event);
174 /* Alternate version that can be called from interrupts
175 * when calling sysfs_notify isn't needed.
177 static void md_new_event_inintr(mddev_t *mddev)
179 atomic_inc(&md_event_count);
180 wake_up(&md_event_waiters);
184 * Enables to iterate over all existing md arrays
185 * all_mddevs_lock protects this list.
187 static LIST_HEAD(all_mddevs);
188 static DEFINE_SPINLOCK(all_mddevs_lock);
192 * iterates through all used mddevs in the system.
193 * We take care to grab the all_mddevs_lock whenever navigating
194 * the list, and to always hold a refcount when unlocked.
195 * Any code which breaks out of this loop while own
196 * a reference to the current mddev and must mddev_put it.
198 #define ITERATE_MDDEV(mddev,tmp) \
200 for (({ spin_lock(&all_mddevs_lock); \
201 tmp = all_mddevs.next; \
203 ({ if (tmp != &all_mddevs) \
204 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
205 spin_unlock(&all_mddevs_lock); \
206 if (mddev) mddev_put(mddev); \
207 mddev = list_entry(tmp, mddev_t, all_mddevs); \
208 tmp != &all_mddevs;}); \
209 ({ spin_lock(&all_mddevs_lock); \
214 static int md_fail_request (struct request_queue *q, struct bio *bio)
220 static inline mddev_t *mddev_get(mddev_t *mddev)
222 atomic_inc(&mddev->active);
226 static void mddev_put(mddev_t *mddev)
228 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
230 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
231 list_del(&mddev->all_mddevs);
232 spin_unlock(&all_mddevs_lock);
233 blk_cleanup_queue(mddev->queue);
234 kobject_put(&mddev->kobj);
236 spin_unlock(&all_mddevs_lock);
239 static mddev_t * mddev_find(dev_t unit)
241 mddev_t *mddev, *new = NULL;
244 spin_lock(&all_mddevs_lock);
245 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
246 if (mddev->unit == unit) {
248 spin_unlock(&all_mddevs_lock);
254 list_add(&new->all_mddevs, &all_mddevs);
255 spin_unlock(&all_mddevs_lock);
258 spin_unlock(&all_mddevs_lock);
260 new = kzalloc(sizeof(*new), GFP_KERNEL);
265 if (MAJOR(unit) == MD_MAJOR)
266 new->md_minor = MINOR(unit);
268 new->md_minor = MINOR(unit) >> MdpMinorShift;
270 mutex_init(&new->reconfig_mutex);
271 INIT_LIST_HEAD(&new->disks);
272 INIT_LIST_HEAD(&new->all_mddevs);
273 init_timer(&new->safemode_timer);
274 atomic_set(&new->active, 1);
275 spin_lock_init(&new->write_lock);
276 init_waitqueue_head(&new->sb_wait);
277 new->reshape_position = MaxSector;
279 new->queue = blk_alloc_queue(GFP_KERNEL);
284 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
286 blk_queue_make_request(new->queue, md_fail_request);
291 static inline int mddev_lock(mddev_t * mddev)
293 return mutex_lock_interruptible(&mddev->reconfig_mutex);
296 static inline int mddev_trylock(mddev_t * mddev)
298 return mutex_trylock(&mddev->reconfig_mutex);
301 static inline void mddev_unlock(mddev_t * mddev)
303 mutex_unlock(&mddev->reconfig_mutex);
305 md_wakeup_thread(mddev->thread);
308 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
311 struct list_head *tmp;
313 ITERATE_RDEV(mddev,rdev,tmp) {
314 if (rdev->desc_nr == nr)
320 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
322 struct list_head *tmp;
325 ITERATE_RDEV(mddev,rdev,tmp) {
326 if (rdev->bdev->bd_dev == dev)
332 static struct mdk_personality *find_pers(int level, char *clevel)
334 struct mdk_personality *pers;
335 list_for_each_entry(pers, &pers_list, list) {
336 if (level != LEVEL_NONE && pers->level == level)
338 if (strcmp(pers->name, clevel)==0)
344 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
346 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
347 return MD_NEW_SIZE_BLOCKS(size);
350 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
354 size = rdev->sb_offset;
357 size &= ~((sector_t)chunk_size/1024 - 1);
361 static int alloc_disk_sb(mdk_rdev_t * rdev)
366 rdev->sb_page = alloc_page(GFP_KERNEL);
367 if (!rdev->sb_page) {
368 printk(KERN_ALERT "md: out of memory.\n");
375 static void free_disk_sb(mdk_rdev_t * rdev)
378 put_page(rdev->sb_page);
380 rdev->sb_page = NULL;
387 static void super_written(struct bio *bio, int error)
389 mdk_rdev_t *rdev = bio->bi_private;
390 mddev_t *mddev = rdev->mddev;
392 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
393 printk("md: super_written gets error=%d, uptodate=%d\n",
394 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
395 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
396 md_error(mddev, rdev);
399 if (atomic_dec_and_test(&mddev->pending_writes))
400 wake_up(&mddev->sb_wait);
404 static void super_written_barrier(struct bio *bio, int error)
406 struct bio *bio2 = bio->bi_private;
407 mdk_rdev_t *rdev = bio2->bi_private;
408 mddev_t *mddev = rdev->mddev;
410 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
411 error == -EOPNOTSUPP) {
413 /* barriers don't appear to be supported :-( */
414 set_bit(BarriersNotsupp, &rdev->flags);
415 mddev->barriers_work = 0;
416 spin_lock_irqsave(&mddev->write_lock, flags);
417 bio2->bi_next = mddev->biolist;
418 mddev->biolist = bio2;
419 spin_unlock_irqrestore(&mddev->write_lock, flags);
420 wake_up(&mddev->sb_wait);
424 bio->bi_private = rdev;
425 super_written(bio, error);
429 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
430 sector_t sector, int size, struct page *page)
432 /* write first size bytes of page to sector of rdev
433 * Increment mddev->pending_writes before returning
434 * and decrement it on completion, waking up sb_wait
435 * if zero is reached.
436 * If an error occurred, call md_error
438 * As we might need to resubmit the request if BIO_RW_BARRIER
439 * causes ENOTSUPP, we allocate a spare bio...
441 struct bio *bio = bio_alloc(GFP_NOIO, 1);
442 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
444 bio->bi_bdev = rdev->bdev;
445 bio->bi_sector = sector;
446 bio_add_page(bio, page, size, 0);
447 bio->bi_private = rdev;
448 bio->bi_end_io = super_written;
451 atomic_inc(&mddev->pending_writes);
452 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
454 rw |= (1<<BIO_RW_BARRIER);
455 rbio = bio_clone(bio, GFP_NOIO);
456 rbio->bi_private = bio;
457 rbio->bi_end_io = super_written_barrier;
458 submit_bio(rw, rbio);
463 void md_super_wait(mddev_t *mddev)
465 /* wait for all superblock writes that were scheduled to complete.
466 * if any had to be retried (due to BARRIER problems), retry them
470 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
471 if (atomic_read(&mddev->pending_writes)==0)
473 while (mddev->biolist) {
475 spin_lock_irq(&mddev->write_lock);
476 bio = mddev->biolist;
477 mddev->biolist = bio->bi_next ;
479 spin_unlock_irq(&mddev->write_lock);
480 submit_bio(bio->bi_rw, bio);
484 finish_wait(&mddev->sb_wait, &wq);
487 static void bi_complete(struct bio *bio, int error)
489 complete((struct completion*)bio->bi_private);
492 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
493 struct page *page, int rw)
495 struct bio *bio = bio_alloc(GFP_NOIO, 1);
496 struct completion event;
499 rw |= (1 << BIO_RW_SYNC);
502 bio->bi_sector = sector;
503 bio_add_page(bio, page, size, 0);
504 init_completion(&event);
505 bio->bi_private = &event;
506 bio->bi_end_io = bi_complete;
508 wait_for_completion(&event);
510 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
514 EXPORT_SYMBOL_GPL(sync_page_io);
516 static int read_disk_sb(mdk_rdev_t * rdev, int size)
518 char b[BDEVNAME_SIZE];
519 if (!rdev->sb_page) {
527 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
533 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
534 bdevname(rdev->bdev,b));
538 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
540 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
541 (sb1->set_uuid1 == sb2->set_uuid1) &&
542 (sb1->set_uuid2 == sb2->set_uuid2) &&
543 (sb1->set_uuid3 == sb2->set_uuid3))
551 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
554 mdp_super_t *tmp1, *tmp2;
556 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
557 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
559 if (!tmp1 || !tmp2) {
561 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
569 * nr_disks is not constant
574 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
586 static u32 md_csum_fold(u32 csum)
588 csum = (csum & 0xffff) + (csum >> 16);
589 return (csum & 0xffff) + (csum >> 16);
592 static unsigned int calc_sb_csum(mdp_super_t * sb)
595 u32 *sb32 = (u32*)sb;
597 unsigned int disk_csum, csum;
599 disk_csum = sb->sb_csum;
602 for (i = 0; i < MD_SB_BYTES/4 ; i++)
604 csum = (newcsum & 0xffffffff) + (newcsum>>32);
608 /* This used to use csum_partial, which was wrong for several
609 * reasons including that different results are returned on
610 * different architectures. It isn't critical that we get exactly
611 * the same return value as before (we always csum_fold before
612 * testing, and that removes any differences). However as we
613 * know that csum_partial always returned a 16bit value on
614 * alphas, do a fold to maximise conformity to previous behaviour.
616 sb->sb_csum = md_csum_fold(disk_csum);
618 sb->sb_csum = disk_csum;
625 * Handle superblock details.
626 * We want to be able to handle multiple superblock formats
627 * so we have a common interface to them all, and an array of
628 * different handlers.
629 * We rely on user-space to write the initial superblock, and support
630 * reading and updating of superblocks.
631 * Interface methods are:
632 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
633 * loads and validates a superblock on dev.
634 * if refdev != NULL, compare superblocks on both devices
636 * 0 - dev has a superblock that is compatible with refdev
637 * 1 - dev has a superblock that is compatible and newer than refdev
638 * so dev should be used as the refdev in future
639 * -EINVAL superblock incompatible or invalid
640 * -othererror e.g. -EIO
642 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
643 * Verify that dev is acceptable into mddev.
644 * The first time, mddev->raid_disks will be 0, and data from
645 * dev should be merged in. Subsequent calls check that dev
646 * is new enough. Return 0 or -EINVAL
648 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
649 * Update the superblock for rdev with data in mddev
650 * This does not write to disc.
656 struct module *owner;
657 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
658 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
659 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
663 * load_super for 0.90.0
665 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
667 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
673 * Calculate the position of the superblock,
674 * it's at the end of the disk.
676 * It also happens to be a multiple of 4Kb.
678 sb_offset = calc_dev_sboffset(rdev->bdev);
679 rdev->sb_offset = sb_offset;
681 ret = read_disk_sb(rdev, MD_SB_BYTES);
686 bdevname(rdev->bdev, b);
687 sb = (mdp_super_t*)page_address(rdev->sb_page);
689 if (sb->md_magic != MD_SB_MAGIC) {
690 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
695 if (sb->major_version != 0 ||
696 sb->minor_version < 90 ||
697 sb->minor_version > 91) {
698 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
699 sb->major_version, sb->minor_version,
704 if (sb->raid_disks <= 0)
707 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
708 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
713 rdev->preferred_minor = sb->md_minor;
714 rdev->data_offset = 0;
715 rdev->sb_size = MD_SB_BYTES;
717 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
718 if (sb->level != 1 && sb->level != 4
719 && sb->level != 5 && sb->level != 6
720 && sb->level != 10) {
721 /* FIXME use a better test */
723 "md: bitmaps not supported for this level.\n");
728 if (sb->level == LEVEL_MULTIPATH)
731 rdev->desc_nr = sb->this_disk.number;
737 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
738 if (!uuid_equal(refsb, sb)) {
739 printk(KERN_WARNING "md: %s has different UUID to %s\n",
740 b, bdevname(refdev->bdev,b2));
743 if (!sb_equal(refsb, sb)) {
744 printk(KERN_WARNING "md: %s has same UUID"
745 " but different superblock to %s\n",
746 b, bdevname(refdev->bdev, b2));
750 ev2 = md_event(refsb);
756 rdev->size = calc_dev_size(rdev, sb->chunk_size);
758 if (rdev->size < sb->size && sb->level > 1)
759 /* "this cannot possibly happen" ... */
767 * validate_super for 0.90.0
769 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
772 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
773 __u64 ev1 = md_event(sb);
775 rdev->raid_disk = -1;
777 if (mddev->raid_disks == 0) {
778 mddev->major_version = 0;
779 mddev->minor_version = sb->minor_version;
780 mddev->patch_version = sb->patch_version;
781 mddev->persistent = 1;
783 mddev->chunk_size = sb->chunk_size;
784 mddev->ctime = sb->ctime;
785 mddev->utime = sb->utime;
786 mddev->level = sb->level;
787 mddev->clevel[0] = 0;
788 mddev->layout = sb->layout;
789 mddev->raid_disks = sb->raid_disks;
790 mddev->size = sb->size;
792 mddev->bitmap_offset = 0;
793 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
795 if (mddev->minor_version >= 91) {
796 mddev->reshape_position = sb->reshape_position;
797 mddev->delta_disks = sb->delta_disks;
798 mddev->new_level = sb->new_level;
799 mddev->new_layout = sb->new_layout;
800 mddev->new_chunk = sb->new_chunk;
802 mddev->reshape_position = MaxSector;
803 mddev->delta_disks = 0;
804 mddev->new_level = mddev->level;
805 mddev->new_layout = mddev->layout;
806 mddev->new_chunk = mddev->chunk_size;
809 if (sb->state & (1<<MD_SB_CLEAN))
810 mddev->recovery_cp = MaxSector;
812 if (sb->events_hi == sb->cp_events_hi &&
813 sb->events_lo == sb->cp_events_lo) {
814 mddev->recovery_cp = sb->recovery_cp;
816 mddev->recovery_cp = 0;
819 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
820 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
821 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
822 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
824 mddev->max_disks = MD_SB_DISKS;
826 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
827 mddev->bitmap_file == NULL)
828 mddev->bitmap_offset = mddev->default_bitmap_offset;
830 } else if (mddev->pers == NULL) {
831 /* Insist on good event counter while assembling */
833 if (ev1 < mddev->events)
835 } else if (mddev->bitmap) {
836 /* if adding to array with a bitmap, then we can accept an
837 * older device ... but not too old.
839 if (ev1 < mddev->bitmap->events_cleared)
842 if (ev1 < mddev->events)
843 /* just a hot-add of a new device, leave raid_disk at -1 */
847 if (mddev->level != LEVEL_MULTIPATH) {
848 desc = sb->disks + rdev->desc_nr;
850 if (desc->state & (1<<MD_DISK_FAULTY))
851 set_bit(Faulty, &rdev->flags);
852 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
853 desc->raid_disk < mddev->raid_disks */) {
854 set_bit(In_sync, &rdev->flags);
855 rdev->raid_disk = desc->raid_disk;
857 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
858 set_bit(WriteMostly, &rdev->flags);
859 } else /* MULTIPATH are always insync */
860 set_bit(In_sync, &rdev->flags);
865 * sync_super for 0.90.0
867 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
870 struct list_head *tmp;
872 int next_spare = mddev->raid_disks;
875 /* make rdev->sb match mddev data..
878 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
879 * 3/ any empty disks < next_spare become removed
881 * disks[0] gets initialised to REMOVED because
882 * we cannot be sure from other fields if it has
883 * been initialised or not.
886 int active=0, working=0,failed=0,spare=0,nr_disks=0;
888 rdev->sb_size = MD_SB_BYTES;
890 sb = (mdp_super_t*)page_address(rdev->sb_page);
892 memset(sb, 0, sizeof(*sb));
894 sb->md_magic = MD_SB_MAGIC;
895 sb->major_version = mddev->major_version;
896 sb->patch_version = mddev->patch_version;
897 sb->gvalid_words = 0; /* ignored */
898 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
899 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
900 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
901 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
903 sb->ctime = mddev->ctime;
904 sb->level = mddev->level;
905 sb->size = mddev->size;
906 sb->raid_disks = mddev->raid_disks;
907 sb->md_minor = mddev->md_minor;
908 sb->not_persistent = 0;
909 sb->utime = mddev->utime;
911 sb->events_hi = (mddev->events>>32);
912 sb->events_lo = (u32)mddev->events;
914 if (mddev->reshape_position == MaxSector)
915 sb->minor_version = 90;
917 sb->minor_version = 91;
918 sb->reshape_position = mddev->reshape_position;
919 sb->new_level = mddev->new_level;
920 sb->delta_disks = mddev->delta_disks;
921 sb->new_layout = mddev->new_layout;
922 sb->new_chunk = mddev->new_chunk;
924 mddev->minor_version = sb->minor_version;
927 sb->recovery_cp = mddev->recovery_cp;
928 sb->cp_events_hi = (mddev->events>>32);
929 sb->cp_events_lo = (u32)mddev->events;
930 if (mddev->recovery_cp == MaxSector)
931 sb->state = (1<< MD_SB_CLEAN);
935 sb->layout = mddev->layout;
936 sb->chunk_size = mddev->chunk_size;
938 if (mddev->bitmap && mddev->bitmap_file == NULL)
939 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
941 sb->disks[0].state = (1<<MD_DISK_REMOVED);
942 ITERATE_RDEV(mddev,rdev2,tmp) {
945 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
946 && !test_bit(Faulty, &rdev2->flags))
947 desc_nr = rdev2->raid_disk;
949 desc_nr = next_spare++;
950 rdev2->desc_nr = desc_nr;
951 d = &sb->disks[rdev2->desc_nr];
953 d->number = rdev2->desc_nr;
954 d->major = MAJOR(rdev2->bdev->bd_dev);
955 d->minor = MINOR(rdev2->bdev->bd_dev);
956 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
957 && !test_bit(Faulty, &rdev2->flags))
958 d->raid_disk = rdev2->raid_disk;
960 d->raid_disk = rdev2->desc_nr; /* compatibility */
961 if (test_bit(Faulty, &rdev2->flags))
962 d->state = (1<<MD_DISK_FAULTY);
963 else if (test_bit(In_sync, &rdev2->flags)) {
964 d->state = (1<<MD_DISK_ACTIVE);
965 d->state |= (1<<MD_DISK_SYNC);
973 if (test_bit(WriteMostly, &rdev2->flags))
974 d->state |= (1<<MD_DISK_WRITEMOSTLY);
976 /* now set the "removed" and "faulty" bits on any missing devices */
977 for (i=0 ; i < mddev->raid_disks ; i++) {
978 mdp_disk_t *d = &sb->disks[i];
979 if (d->state == 0 && d->number == 0) {
982 d->state = (1<<MD_DISK_REMOVED);
983 d->state |= (1<<MD_DISK_FAULTY);
987 sb->nr_disks = nr_disks;
988 sb->active_disks = active;
989 sb->working_disks = working;
990 sb->failed_disks = failed;
991 sb->spare_disks = spare;
993 sb->this_disk = sb->disks[rdev->desc_nr];
994 sb->sb_csum = calc_sb_csum(sb);
998 * version 1 superblock
1001 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1005 unsigned long long newcsum;
1006 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1007 __le32 *isuper = (__le32*)sb;
1010 disk_csum = sb->sb_csum;
1013 for (i=0; size>=4; size -= 4 )
1014 newcsum += le32_to_cpu(*isuper++);
1017 newcsum += le16_to_cpu(*(__le16*) isuper);
1019 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1020 sb->sb_csum = disk_csum;
1021 return cpu_to_le32(csum);
1024 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1026 struct mdp_superblock_1 *sb;
1029 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1033 * Calculate the position of the superblock.
1034 * It is always aligned to a 4K boundary and
1035 * depeding on minor_version, it can be:
1036 * 0: At least 8K, but less than 12K, from end of device
1037 * 1: At start of device
1038 * 2: 4K from start of device.
1040 switch(minor_version) {
1042 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1044 sb_offset &= ~(sector_t)(4*2-1);
1045 /* convert from sectors to K */
1057 rdev->sb_offset = sb_offset;
1059 /* superblock is rarely larger than 1K, but it can be larger,
1060 * and it is safe to read 4k, so we do that
1062 ret = read_disk_sb(rdev, 4096);
1063 if (ret) return ret;
1066 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1068 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1069 sb->major_version != cpu_to_le32(1) ||
1070 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1071 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1072 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1075 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1076 printk("md: invalid superblock checksum on %s\n",
1077 bdevname(rdev->bdev,b));
1080 if (le64_to_cpu(sb->data_size) < 10) {
1081 printk("md: data_size too small on %s\n",
1082 bdevname(rdev->bdev,b));
1085 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1086 if (sb->level != cpu_to_le32(1) &&
1087 sb->level != cpu_to_le32(4) &&
1088 sb->level != cpu_to_le32(5) &&
1089 sb->level != cpu_to_le32(6) &&
1090 sb->level != cpu_to_le32(10)) {
1092 "md: bitmaps not supported for this level.\n");
1097 rdev->preferred_minor = 0xffff;
1098 rdev->data_offset = le64_to_cpu(sb->data_offset);
1099 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1101 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1102 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1103 if (rdev->sb_size & bmask)
1104 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1106 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1109 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1115 struct mdp_superblock_1 *refsb =
1116 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1118 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1119 sb->level != refsb->level ||
1120 sb->layout != refsb->layout ||
1121 sb->chunksize != refsb->chunksize) {
1122 printk(KERN_WARNING "md: %s has strangely different"
1123 " superblock to %s\n",
1124 bdevname(rdev->bdev,b),
1125 bdevname(refdev->bdev,b2));
1128 ev1 = le64_to_cpu(sb->events);
1129 ev2 = le64_to_cpu(refsb->events);
1137 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1139 rdev->size = rdev->sb_offset;
1140 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1142 rdev->size = le64_to_cpu(sb->data_size)/2;
1143 if (le32_to_cpu(sb->chunksize))
1144 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1146 if (le64_to_cpu(sb->size) > rdev->size*2)
1151 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1153 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1154 __u64 ev1 = le64_to_cpu(sb->events);
1156 rdev->raid_disk = -1;
1158 if (mddev->raid_disks == 0) {
1159 mddev->major_version = 1;
1160 mddev->patch_version = 0;
1161 mddev->persistent = 1;
1162 mddev->external = 0;
1163 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1164 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1165 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1166 mddev->level = le32_to_cpu(sb->level);
1167 mddev->clevel[0] = 0;
1168 mddev->layout = le32_to_cpu(sb->layout);
1169 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1170 mddev->size = le64_to_cpu(sb->size)/2;
1171 mddev->events = ev1;
1172 mddev->bitmap_offset = 0;
1173 mddev->default_bitmap_offset = 1024 >> 9;
1175 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1176 memcpy(mddev->uuid, sb->set_uuid, 16);
1178 mddev->max_disks = (4096-256)/2;
1180 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1181 mddev->bitmap_file == NULL )
1182 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1184 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1185 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1186 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1187 mddev->new_level = le32_to_cpu(sb->new_level);
1188 mddev->new_layout = le32_to_cpu(sb->new_layout);
1189 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1191 mddev->reshape_position = MaxSector;
1192 mddev->delta_disks = 0;
1193 mddev->new_level = mddev->level;
1194 mddev->new_layout = mddev->layout;
1195 mddev->new_chunk = mddev->chunk_size;
1198 } else if (mddev->pers == NULL) {
1199 /* Insist of good event counter while assembling */
1201 if (ev1 < mddev->events)
1203 } else if (mddev->bitmap) {
1204 /* If adding to array with a bitmap, then we can accept an
1205 * older device, but not too old.
1207 if (ev1 < mddev->bitmap->events_cleared)
1210 if (ev1 < mddev->events)
1211 /* just a hot-add of a new device, leave raid_disk at -1 */
1214 if (mddev->level != LEVEL_MULTIPATH) {
1216 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1218 case 0xffff: /* spare */
1220 case 0xfffe: /* faulty */
1221 set_bit(Faulty, &rdev->flags);
1224 if ((le32_to_cpu(sb->feature_map) &
1225 MD_FEATURE_RECOVERY_OFFSET))
1226 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1228 set_bit(In_sync, &rdev->flags);
1229 rdev->raid_disk = role;
1232 if (sb->devflags & WriteMostly1)
1233 set_bit(WriteMostly, &rdev->flags);
1234 } else /* MULTIPATH are always insync */
1235 set_bit(In_sync, &rdev->flags);
1240 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1242 struct mdp_superblock_1 *sb;
1243 struct list_head *tmp;
1246 /* make rdev->sb match mddev and rdev data. */
1248 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1250 sb->feature_map = 0;
1252 sb->recovery_offset = cpu_to_le64(0);
1253 memset(sb->pad1, 0, sizeof(sb->pad1));
1254 memset(sb->pad2, 0, sizeof(sb->pad2));
1255 memset(sb->pad3, 0, sizeof(sb->pad3));
1257 sb->utime = cpu_to_le64((__u64)mddev->utime);
1258 sb->events = cpu_to_le64(mddev->events);
1260 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1262 sb->resync_offset = cpu_to_le64(0);
1264 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1266 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1267 sb->size = cpu_to_le64(mddev->size<<1);
1269 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1270 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1271 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1274 if (rdev->raid_disk >= 0 &&
1275 !test_bit(In_sync, &rdev->flags) &&
1276 rdev->recovery_offset > 0) {
1277 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1278 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1281 if (mddev->reshape_position != MaxSector) {
1282 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1283 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1284 sb->new_layout = cpu_to_le32(mddev->new_layout);
1285 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1286 sb->new_level = cpu_to_le32(mddev->new_level);
1287 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1291 ITERATE_RDEV(mddev,rdev2,tmp)
1292 if (rdev2->desc_nr+1 > max_dev)
1293 max_dev = rdev2->desc_nr+1;
1295 if (max_dev > le32_to_cpu(sb->max_dev))
1296 sb->max_dev = cpu_to_le32(max_dev);
1297 for (i=0; i<max_dev;i++)
1298 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1300 ITERATE_RDEV(mddev,rdev2,tmp) {
1302 if (test_bit(Faulty, &rdev2->flags))
1303 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1304 else if (test_bit(In_sync, &rdev2->flags))
1305 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1306 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1307 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1309 sb->dev_roles[i] = cpu_to_le16(0xffff);
1312 sb->sb_csum = calc_sb_1_csum(sb);
1316 static struct super_type super_types[] = {
1319 .owner = THIS_MODULE,
1320 .load_super = super_90_load,
1321 .validate_super = super_90_validate,
1322 .sync_super = super_90_sync,
1326 .owner = THIS_MODULE,
1327 .load_super = super_1_load,
1328 .validate_super = super_1_validate,
1329 .sync_super = super_1_sync,
1333 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1335 struct list_head *tmp, *tmp2;
1336 mdk_rdev_t *rdev, *rdev2;
1338 ITERATE_RDEV(mddev1,rdev,tmp)
1339 ITERATE_RDEV(mddev2, rdev2, tmp2)
1340 if (rdev->bdev->bd_contains ==
1341 rdev2->bdev->bd_contains)
1347 static LIST_HEAD(pending_raid_disks);
1349 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1351 char b[BDEVNAME_SIZE];
1360 /* make sure rdev->size exceeds mddev->size */
1361 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1363 /* Cannot change size, so fail
1364 * If mddev->level <= 0, then we don't care
1365 * about aligning sizes (e.g. linear)
1367 if (mddev->level > 0)
1370 mddev->size = rdev->size;
1373 /* Verify rdev->desc_nr is unique.
1374 * If it is -1, assign a free number, else
1375 * check number is not in use
1377 if (rdev->desc_nr < 0) {
1379 if (mddev->pers) choice = mddev->raid_disks;
1380 while (find_rdev_nr(mddev, choice))
1382 rdev->desc_nr = choice;
1384 if (find_rdev_nr(mddev, rdev->desc_nr))
1387 bdevname(rdev->bdev,b);
1388 while ( (s=strchr(b, '/')) != NULL)
1391 rdev->mddev = mddev;
1392 printk(KERN_INFO "md: bind<%s>\n", b);
1394 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1397 if (rdev->bdev->bd_part)
1398 ko = &rdev->bdev->bd_part->dev.kobj;
1400 ko = &rdev->bdev->bd_disk->dev.kobj;
1401 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1402 kobject_del(&rdev->kobj);
1405 list_add(&rdev->same_set, &mddev->disks);
1406 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1410 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1415 static void delayed_delete(struct work_struct *ws)
1417 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1418 kobject_del(&rdev->kobj);
1421 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1423 char b[BDEVNAME_SIZE];
1428 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1429 list_del_init(&rdev->same_set);
1430 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1432 sysfs_remove_link(&rdev->kobj, "block");
1434 /* We need to delay this, otherwise we can deadlock when
1435 * writing to 'remove' to "dev/state"
1437 INIT_WORK(&rdev->del_work, delayed_delete);
1438 schedule_work(&rdev->del_work);
1442 * prevent the device from being mounted, repartitioned or
1443 * otherwise reused by a RAID array (or any other kernel
1444 * subsystem), by bd_claiming the device.
1446 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1449 struct block_device *bdev;
1450 char b[BDEVNAME_SIZE];
1452 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1454 printk(KERN_ERR "md: could not open %s.\n",
1455 __bdevname(dev, b));
1456 return PTR_ERR(bdev);
1458 err = bd_claim(bdev, rdev);
1460 printk(KERN_ERR "md: could not bd_claim %s.\n",
1469 static void unlock_rdev(mdk_rdev_t *rdev)
1471 struct block_device *bdev = rdev->bdev;
1479 void md_autodetect_dev(dev_t dev);
1481 static void export_rdev(mdk_rdev_t * rdev)
1483 char b[BDEVNAME_SIZE];
1484 printk(KERN_INFO "md: export_rdev(%s)\n",
1485 bdevname(rdev->bdev,b));
1489 list_del_init(&rdev->same_set);
1491 md_autodetect_dev(rdev->bdev->bd_dev);
1494 kobject_put(&rdev->kobj);
1497 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1499 unbind_rdev_from_array(rdev);
1503 static void export_array(mddev_t *mddev)
1505 struct list_head *tmp;
1508 ITERATE_RDEV(mddev,rdev,tmp) {
1513 kick_rdev_from_array(rdev);
1515 if (!list_empty(&mddev->disks))
1517 mddev->raid_disks = 0;
1518 mddev->major_version = 0;
1521 static void print_desc(mdp_disk_t *desc)
1523 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1524 desc->major,desc->minor,desc->raid_disk,desc->state);
1527 static void print_sb(mdp_super_t *sb)
1532 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1533 sb->major_version, sb->minor_version, sb->patch_version,
1534 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1536 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1537 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1538 sb->md_minor, sb->layout, sb->chunk_size);
1539 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1540 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1541 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1542 sb->failed_disks, sb->spare_disks,
1543 sb->sb_csum, (unsigned long)sb->events_lo);
1546 for (i = 0; i < MD_SB_DISKS; i++) {
1549 desc = sb->disks + i;
1550 if (desc->number || desc->major || desc->minor ||
1551 desc->raid_disk || (desc->state && (desc->state != 4))) {
1552 printk(" D %2d: ", i);
1556 printk(KERN_INFO "md: THIS: ");
1557 print_desc(&sb->this_disk);
1561 static void print_rdev(mdk_rdev_t *rdev)
1563 char b[BDEVNAME_SIZE];
1564 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1565 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1566 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1568 if (rdev->sb_loaded) {
1569 printk(KERN_INFO "md: rdev superblock:\n");
1570 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1572 printk(KERN_INFO "md: no rdev superblock!\n");
1575 static void md_print_devices(void)
1577 struct list_head *tmp, *tmp2;
1580 char b[BDEVNAME_SIZE];
1583 printk("md: **********************************\n");
1584 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1585 printk("md: **********************************\n");
1586 ITERATE_MDDEV(mddev,tmp) {
1589 bitmap_print_sb(mddev->bitmap);
1591 printk("%s: ", mdname(mddev));
1592 ITERATE_RDEV(mddev,rdev,tmp2)
1593 printk("<%s>", bdevname(rdev->bdev,b));
1596 ITERATE_RDEV(mddev,rdev,tmp2)
1599 printk("md: **********************************\n");
1604 static void sync_sbs(mddev_t * mddev, int nospares)
1606 /* Update each superblock (in-memory image), but
1607 * if we are allowed to, skip spares which already
1608 * have the right event counter, or have one earlier
1609 * (which would mean they aren't being marked as dirty
1610 * with the rest of the array)
1613 struct list_head *tmp;
1615 ITERATE_RDEV(mddev,rdev,tmp) {
1616 if (rdev->sb_events == mddev->events ||
1618 rdev->raid_disk < 0 &&
1619 (rdev->sb_events&1)==0 &&
1620 rdev->sb_events+1 == mddev->events)) {
1621 /* Don't update this superblock */
1622 rdev->sb_loaded = 2;
1624 super_types[mddev->major_version].
1625 sync_super(mddev, rdev);
1626 rdev->sb_loaded = 1;
1631 static void md_update_sb(mddev_t * mddev, int force_change)
1633 struct list_head *tmp;
1639 spin_lock_irq(&mddev->write_lock);
1641 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1642 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1644 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1645 /* just a clean<-> dirty transition, possibly leave spares alone,
1646 * though if events isn't the right even/odd, we will have to do
1652 if (mddev->degraded)
1653 /* If the array is degraded, then skipping spares is both
1654 * dangerous and fairly pointless.
1655 * Dangerous because a device that was removed from the array
1656 * might have a event_count that still looks up-to-date,
1657 * so it can be re-added without a resync.
1658 * Pointless because if there are any spares to skip,
1659 * then a recovery will happen and soon that array won't
1660 * be degraded any more and the spare can go back to sleep then.
1664 sync_req = mddev->in_sync;
1665 mddev->utime = get_seconds();
1667 /* If this is just a dirty<->clean transition, and the array is clean
1668 * and 'events' is odd, we can roll back to the previous clean state */
1670 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1671 && (mddev->events & 1)
1672 && mddev->events != 1)
1675 /* otherwise we have to go forward and ... */
1677 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1678 /* .. if the array isn't clean, insist on an odd 'events' */
1679 if ((mddev->events&1)==0) {
1684 /* otherwise insist on an even 'events' (for clean states) */
1685 if ((mddev->events&1)) {
1692 if (!mddev->events) {
1694 * oops, this 64-bit counter should never wrap.
1695 * Either we are in around ~1 trillion A.C., assuming
1696 * 1 reboot per second, or we have a bug:
1703 * do not write anything to disk if using
1704 * nonpersistent superblocks
1706 if (!mddev->persistent) {
1707 if (!mddev->external)
1708 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1710 spin_unlock_irq(&mddev->write_lock);
1711 wake_up(&mddev->sb_wait);
1714 sync_sbs(mddev, nospares);
1715 spin_unlock_irq(&mddev->write_lock);
1718 "md: updating %s RAID superblock on device (in sync %d)\n",
1719 mdname(mddev),mddev->in_sync);
1721 bitmap_update_sb(mddev->bitmap);
1722 ITERATE_RDEV(mddev,rdev,tmp) {
1723 char b[BDEVNAME_SIZE];
1724 dprintk(KERN_INFO "md: ");
1725 if (rdev->sb_loaded != 1)
1726 continue; /* no noise on spare devices */
1727 if (test_bit(Faulty, &rdev->flags))
1728 dprintk("(skipping faulty ");
1730 dprintk("%s ", bdevname(rdev->bdev,b));
1731 if (!test_bit(Faulty, &rdev->flags)) {
1732 md_super_write(mddev,rdev,
1733 rdev->sb_offset<<1, rdev->sb_size,
1735 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1736 bdevname(rdev->bdev,b),
1737 (unsigned long long)rdev->sb_offset);
1738 rdev->sb_events = mddev->events;
1742 if (mddev->level == LEVEL_MULTIPATH)
1743 /* only need to write one superblock... */
1746 md_super_wait(mddev);
1747 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1749 spin_lock_irq(&mddev->write_lock);
1750 if (mddev->in_sync != sync_req ||
1751 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1752 /* have to write it out again */
1753 spin_unlock_irq(&mddev->write_lock);
1756 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1757 spin_unlock_irq(&mddev->write_lock);
1758 wake_up(&mddev->sb_wait);
1762 /* words written to sysfs files may, or my not, be \n terminated.
1763 * We want to accept with case. For this we use cmd_match.
1765 static int cmd_match(const char *cmd, const char *str)
1767 /* See if cmd, written into a sysfs file, matches
1768 * str. They must either be the same, or cmd can
1769 * have a trailing newline
1771 while (*cmd && *str && *cmd == *str) {
1782 struct rdev_sysfs_entry {
1783 struct attribute attr;
1784 ssize_t (*show)(mdk_rdev_t *, char *);
1785 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1789 state_show(mdk_rdev_t *rdev, char *page)
1794 if (test_bit(Faulty, &rdev->flags)) {
1795 len+= sprintf(page+len, "%sfaulty",sep);
1798 if (test_bit(In_sync, &rdev->flags)) {
1799 len += sprintf(page+len, "%sin_sync",sep);
1802 if (test_bit(WriteMostly, &rdev->flags)) {
1803 len += sprintf(page+len, "%swrite_mostly",sep);
1806 if (!test_bit(Faulty, &rdev->flags) &&
1807 !test_bit(In_sync, &rdev->flags)) {
1808 len += sprintf(page+len, "%sspare", sep);
1811 return len+sprintf(page+len, "\n");
1815 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1818 * faulty - simulates and error
1819 * remove - disconnects the device
1820 * writemostly - sets write_mostly
1821 * -writemostly - clears write_mostly
1824 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1825 md_error(rdev->mddev, rdev);
1827 } else if (cmd_match(buf, "remove")) {
1828 if (rdev->raid_disk >= 0)
1831 mddev_t *mddev = rdev->mddev;
1832 kick_rdev_from_array(rdev);
1834 md_update_sb(mddev, 1);
1835 md_new_event(mddev);
1838 } else if (cmd_match(buf, "writemostly")) {
1839 set_bit(WriteMostly, &rdev->flags);
1841 } else if (cmd_match(buf, "-writemostly")) {
1842 clear_bit(WriteMostly, &rdev->flags);
1845 return err ? err : len;
1847 static struct rdev_sysfs_entry rdev_state =
1848 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1851 super_show(mdk_rdev_t *rdev, char *page)
1853 if (rdev->sb_loaded && rdev->sb_size) {
1854 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1855 return rdev->sb_size;
1859 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1862 errors_show(mdk_rdev_t *rdev, char *page)
1864 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1868 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1871 unsigned long n = simple_strtoul(buf, &e, 10);
1872 if (*buf && (*e == 0 || *e == '\n')) {
1873 atomic_set(&rdev->corrected_errors, n);
1878 static struct rdev_sysfs_entry rdev_errors =
1879 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1882 slot_show(mdk_rdev_t *rdev, char *page)
1884 if (rdev->raid_disk < 0)
1885 return sprintf(page, "none\n");
1887 return sprintf(page, "%d\n", rdev->raid_disk);
1891 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1896 int slot = simple_strtoul(buf, &e, 10);
1897 if (strncmp(buf, "none", 4)==0)
1899 else if (e==buf || (*e && *e!= '\n'))
1901 if (rdev->mddev->pers) {
1902 /* Setting 'slot' on an active array requires also
1903 * updating the 'rd%d' link, and communicating
1904 * with the personality with ->hot_*_disk.
1905 * For now we only support removing
1906 * failed/spare devices. This normally happens automatically,
1907 * but not when the metadata is externally managed.
1911 if (rdev->raid_disk == -1)
1913 /* personality does all needed checks */
1914 if (rdev->mddev->pers->hot_add_disk == NULL)
1916 err = rdev->mddev->pers->
1917 hot_remove_disk(rdev->mddev, rdev->raid_disk);
1920 sprintf(nm, "rd%d", rdev->raid_disk);
1921 sysfs_remove_link(&rdev->mddev->kobj, nm);
1922 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1923 md_wakeup_thread(rdev->mddev->thread);
1925 if (slot >= rdev->mddev->raid_disks)
1927 rdev->raid_disk = slot;
1928 /* assume it is working */
1930 set_bit(In_sync, &rdev->flags);
1936 static struct rdev_sysfs_entry rdev_slot =
1937 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
1940 offset_show(mdk_rdev_t *rdev, char *page)
1942 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1946 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1949 unsigned long long offset = simple_strtoull(buf, &e, 10);
1950 if (e==buf || (*e && *e != '\n'))
1952 if (rdev->mddev->pers)
1954 rdev->data_offset = offset;
1958 static struct rdev_sysfs_entry rdev_offset =
1959 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
1962 rdev_size_show(mdk_rdev_t *rdev, char *page)
1964 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1968 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1971 unsigned long long size = simple_strtoull(buf, &e, 10);
1972 if (e==buf || (*e && *e != '\n'))
1974 if (rdev->mddev->pers)
1977 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1978 rdev->mddev->size = size;
1982 static struct rdev_sysfs_entry rdev_size =
1983 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
1985 static struct attribute *rdev_default_attrs[] = {
1995 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1997 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1998 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2002 return entry->show(rdev, page);
2006 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2007 const char *page, size_t length)
2009 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2010 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2014 if (!capable(CAP_SYS_ADMIN))
2016 return entry->store(rdev, page, length);
2019 static void rdev_free(struct kobject *ko)
2021 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2024 static struct sysfs_ops rdev_sysfs_ops = {
2025 .show = rdev_attr_show,
2026 .store = rdev_attr_store,
2028 static struct kobj_type rdev_ktype = {
2029 .release = rdev_free,
2030 .sysfs_ops = &rdev_sysfs_ops,
2031 .default_attrs = rdev_default_attrs,
2035 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2037 * mark the device faulty if:
2039 * - the device is nonexistent (zero size)
2040 * - the device has no valid superblock
2042 * a faulty rdev _never_ has rdev->sb set.
2044 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2046 char b[BDEVNAME_SIZE];
2051 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2053 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2054 return ERR_PTR(-ENOMEM);
2057 if ((err = alloc_disk_sb(rdev)))
2060 err = lock_rdev(rdev, newdev);
2064 kobject_init(&rdev->kobj, &rdev_ktype);
2067 rdev->saved_raid_disk = -1;
2068 rdev->raid_disk = -1;
2070 rdev->data_offset = 0;
2071 rdev->sb_events = 0;
2072 atomic_set(&rdev->nr_pending, 0);
2073 atomic_set(&rdev->read_errors, 0);
2074 atomic_set(&rdev->corrected_errors, 0);
2076 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2079 "md: %s has zero or unknown size, marking faulty!\n",
2080 bdevname(rdev->bdev,b));
2085 if (super_format >= 0) {
2086 err = super_types[super_format].
2087 load_super(rdev, NULL, super_minor);
2088 if (err == -EINVAL) {
2090 "md: %s does not have a valid v%d.%d "
2091 "superblock, not importing!\n",
2092 bdevname(rdev->bdev,b),
2093 super_format, super_minor);
2098 "md: could not read %s's sb, not importing!\n",
2099 bdevname(rdev->bdev,b));
2103 INIT_LIST_HEAD(&rdev->same_set);
2108 if (rdev->sb_page) {
2114 return ERR_PTR(err);
2118 * Check a full RAID array for plausibility
2122 static void analyze_sbs(mddev_t * mddev)
2125 struct list_head *tmp;
2126 mdk_rdev_t *rdev, *freshest;
2127 char b[BDEVNAME_SIZE];
2130 ITERATE_RDEV(mddev,rdev,tmp)
2131 switch (super_types[mddev->major_version].
2132 load_super(rdev, freshest, mddev->minor_version)) {
2140 "md: fatal superblock inconsistency in %s"
2141 " -- removing from array\n",
2142 bdevname(rdev->bdev,b));
2143 kick_rdev_from_array(rdev);
2147 super_types[mddev->major_version].
2148 validate_super(mddev, freshest);
2151 ITERATE_RDEV(mddev,rdev,tmp) {
2152 if (rdev != freshest)
2153 if (super_types[mddev->major_version].
2154 validate_super(mddev, rdev)) {
2155 printk(KERN_WARNING "md: kicking non-fresh %s"
2157 bdevname(rdev->bdev,b));
2158 kick_rdev_from_array(rdev);
2161 if (mddev->level == LEVEL_MULTIPATH) {
2162 rdev->desc_nr = i++;
2163 rdev->raid_disk = rdev->desc_nr;
2164 set_bit(In_sync, &rdev->flags);
2165 } else if (rdev->raid_disk >= mddev->raid_disks) {
2166 rdev->raid_disk = -1;
2167 clear_bit(In_sync, &rdev->flags);
2173 if (mddev->recovery_cp != MaxSector &&
2175 printk(KERN_ERR "md: %s: raid array is not clean"
2176 " -- starting background reconstruction\n",
2182 safe_delay_show(mddev_t *mddev, char *page)
2184 int msec = (mddev->safemode_delay*1000)/HZ;
2185 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2188 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2196 /* remove a period, and count digits after it */
2197 if (len >= sizeof(buf))
2199 strlcpy(buf, cbuf, len);
2201 for (i=0; i<len; i++) {
2203 if (isdigit(buf[i])) {
2208 } else if (buf[i] == '.') {
2213 msec = simple_strtoul(buf, &e, 10);
2214 if (e == buf || (*e && *e != '\n'))
2216 msec = (msec * 1000) / scale;
2218 mddev->safemode_delay = 0;
2220 mddev->safemode_delay = (msec*HZ)/1000;
2221 if (mddev->safemode_delay == 0)
2222 mddev->safemode_delay = 1;
2226 static struct md_sysfs_entry md_safe_delay =
2227 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2230 level_show(mddev_t *mddev, char *page)
2232 struct mdk_personality *p = mddev->pers;
2234 return sprintf(page, "%s\n", p->name);
2235 else if (mddev->clevel[0])
2236 return sprintf(page, "%s\n", mddev->clevel);
2237 else if (mddev->level != LEVEL_NONE)
2238 return sprintf(page, "%d\n", mddev->level);
2244 level_store(mddev_t *mddev, const char *buf, size_t len)
2251 if (len >= sizeof(mddev->clevel))
2253 strncpy(mddev->clevel, buf, len);
2254 if (mddev->clevel[len-1] == '\n')
2256 mddev->clevel[len] = 0;
2257 mddev->level = LEVEL_NONE;
2261 static struct md_sysfs_entry md_level =
2262 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2266 layout_show(mddev_t *mddev, char *page)
2268 /* just a number, not meaningful for all levels */
2269 if (mddev->reshape_position != MaxSector &&
2270 mddev->layout != mddev->new_layout)
2271 return sprintf(page, "%d (%d)\n",
2272 mddev->new_layout, mddev->layout);
2273 return sprintf(page, "%d\n", mddev->layout);
2277 layout_store(mddev_t *mddev, const char *buf, size_t len)
2280 unsigned long n = simple_strtoul(buf, &e, 10);
2282 if (!*buf || (*e && *e != '\n'))
2287 if (mddev->reshape_position != MaxSector)
2288 mddev->new_layout = n;
2293 static struct md_sysfs_entry md_layout =
2294 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2298 raid_disks_show(mddev_t *mddev, char *page)
2300 if (mddev->raid_disks == 0)
2302 if (mddev->reshape_position != MaxSector &&
2303 mddev->delta_disks != 0)
2304 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2305 mddev->raid_disks - mddev->delta_disks);
2306 return sprintf(page, "%d\n", mddev->raid_disks);
2309 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2312 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2316 unsigned long n = simple_strtoul(buf, &e, 10);
2318 if (!*buf || (*e && *e != '\n'))
2322 rv = update_raid_disks(mddev, n);
2323 else if (mddev->reshape_position != MaxSector) {
2324 int olddisks = mddev->raid_disks - mddev->delta_disks;
2325 mddev->delta_disks = n - olddisks;
2326 mddev->raid_disks = n;
2328 mddev->raid_disks = n;
2329 return rv ? rv : len;
2331 static struct md_sysfs_entry md_raid_disks =
2332 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2335 chunk_size_show(mddev_t *mddev, char *page)
2337 if (mddev->reshape_position != MaxSector &&
2338 mddev->chunk_size != mddev->new_chunk)
2339 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2341 return sprintf(page, "%d\n", mddev->chunk_size);
2345 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2347 /* can only set chunk_size if array is not yet active */
2349 unsigned long n = simple_strtoul(buf, &e, 10);
2351 if (!*buf || (*e && *e != '\n'))
2356 else if (mddev->reshape_position != MaxSector)
2357 mddev->new_chunk = n;
2359 mddev->chunk_size = n;
2362 static struct md_sysfs_entry md_chunk_size =
2363 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2366 resync_start_show(mddev_t *mddev, char *page)
2368 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2372 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2374 /* can only set chunk_size if array is not yet active */
2376 unsigned long long n = simple_strtoull(buf, &e, 10);
2380 if (!*buf || (*e && *e != '\n'))
2383 mddev->recovery_cp = n;
2386 static struct md_sysfs_entry md_resync_start =
2387 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2390 * The array state can be:
2393 * No devices, no size, no level
2394 * Equivalent to STOP_ARRAY ioctl
2396 * May have some settings, but array is not active
2397 * all IO results in error
2398 * When written, doesn't tear down array, but just stops it
2399 * suspended (not supported yet)
2400 * All IO requests will block. The array can be reconfigured.
2401 * Writing this, if accepted, will block until array is quiessent
2403 * no resync can happen. no superblocks get written.
2404 * write requests fail
2406 * like readonly, but behaves like 'clean' on a write request.
2408 * clean - no pending writes, but otherwise active.
2409 * When written to inactive array, starts without resync
2410 * If a write request arrives then
2411 * if metadata is known, mark 'dirty' and switch to 'active'.
2412 * if not known, block and switch to write-pending
2413 * If written to an active array that has pending writes, then fails.
2415 * fully active: IO and resync can be happening.
2416 * When written to inactive array, starts with resync
2419 * clean, but writes are blocked waiting for 'active' to be written.
2422 * like active, but no writes have been seen for a while (100msec).
2425 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2426 write_pending, active_idle, bad_word};
2427 static char *array_states[] = {
2428 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2429 "write-pending", "active-idle", NULL };
2431 static int match_word(const char *word, char **list)
2434 for (n=0; list[n]; n++)
2435 if (cmd_match(word, list[n]))
2441 array_state_show(mddev_t *mddev, char *page)
2443 enum array_state st = inactive;
2456 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2458 else if (mddev->safemode)
2464 if (list_empty(&mddev->disks) &&
2465 mddev->raid_disks == 0 &&
2471 return sprintf(page, "%s\n", array_states[st]);
2474 static int do_md_stop(mddev_t * mddev, int ro);
2475 static int do_md_run(mddev_t * mddev);
2476 static int restart_array(mddev_t *mddev);
2479 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2482 enum array_state st = match_word(buf, array_states);
2487 /* stopping an active array */
2488 if (atomic_read(&mddev->active) > 1)
2490 err = do_md_stop(mddev, 0);
2493 /* stopping an active array */
2495 if (atomic_read(&mddev->active) > 1)
2497 err = do_md_stop(mddev, 2);
2499 err = 0; /* already inactive */
2502 break; /* not supported yet */
2505 err = do_md_stop(mddev, 1);
2508 err = do_md_run(mddev);
2512 /* stopping an active array */
2514 err = do_md_stop(mddev, 1);
2516 mddev->ro = 2; /* FIXME mark devices writable */
2519 err = do_md_run(mddev);
2524 restart_array(mddev);
2525 spin_lock_irq(&mddev->write_lock);
2526 if (atomic_read(&mddev->writes_pending) == 0) {
2527 if (mddev->in_sync == 0) {
2529 if (mddev->persistent)
2530 set_bit(MD_CHANGE_CLEAN,
2536 spin_unlock_irq(&mddev->write_lock);
2539 mddev->recovery_cp = MaxSector;
2540 err = do_md_run(mddev);
2545 restart_array(mddev);
2546 if (mddev->external)
2547 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2548 wake_up(&mddev->sb_wait);
2552 err = do_md_run(mddev);
2557 /* these cannot be set */
2565 static struct md_sysfs_entry md_array_state =
2566 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2569 null_show(mddev_t *mddev, char *page)
2575 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2577 /* buf must be %d:%d\n? giving major and minor numbers */
2578 /* The new device is added to the array.
2579 * If the array has a persistent superblock, we read the
2580 * superblock to initialise info and check validity.
2581 * Otherwise, only checking done is that in bind_rdev_to_array,
2582 * which mainly checks size.
2585 int major = simple_strtoul(buf, &e, 10);
2591 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2593 minor = simple_strtoul(e+1, &e, 10);
2594 if (*e && *e != '\n')
2596 dev = MKDEV(major, minor);
2597 if (major != MAJOR(dev) ||
2598 minor != MINOR(dev))
2602 if (mddev->persistent) {
2603 rdev = md_import_device(dev, mddev->major_version,
2604 mddev->minor_version);
2605 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2606 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2607 mdk_rdev_t, same_set);
2608 err = super_types[mddev->major_version]
2609 .load_super(rdev, rdev0, mddev->minor_version);
2614 rdev = md_import_device(dev, -1, -1);
2617 return PTR_ERR(rdev);
2618 err = bind_rdev_to_array(rdev, mddev);
2622 return err ? err : len;
2625 static struct md_sysfs_entry md_new_device =
2626 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2629 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2632 unsigned long chunk, end_chunk;
2636 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2638 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2639 if (buf == end) break;
2640 if (*end == '-') { /* range */
2642 end_chunk = simple_strtoul(buf, &end, 0);
2643 if (buf == end) break;
2645 if (*end && !isspace(*end)) break;
2646 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2648 while (isspace(*buf)) buf++;
2650 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2655 static struct md_sysfs_entry md_bitmap =
2656 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2659 size_show(mddev_t *mddev, char *page)
2661 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2664 static int update_size(mddev_t *mddev, unsigned long size);
2667 size_store(mddev_t *mddev, const char *buf, size_t len)
2669 /* If array is inactive, we can reduce the component size, but
2670 * not increase it (except from 0).
2671 * If array is active, we can try an on-line resize
2675 unsigned long long size = simple_strtoull(buf, &e, 10);
2676 if (!*buf || *buf == '\n' ||
2681 err = update_size(mddev, size);
2682 md_update_sb(mddev, 1);
2684 if (mddev->size == 0 ||
2690 return err ? err : len;
2693 static struct md_sysfs_entry md_size =
2694 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2699 * 'none' for arrays with no metadata (good luck...)
2700 * 'external' for arrays with externally managed metadata,
2701 * or N.M for internally known formats
2704 metadata_show(mddev_t *mddev, char *page)
2706 if (mddev->persistent)
2707 return sprintf(page, "%d.%d\n",
2708 mddev->major_version, mddev->minor_version);
2709 else if (mddev->external)
2710 return sprintf(page, "external:%s\n", mddev->metadata_type);
2712 return sprintf(page, "none\n");
2716 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2720 if (!list_empty(&mddev->disks))
2723 if (cmd_match(buf, "none")) {
2724 mddev->persistent = 0;
2725 mddev->external = 0;
2726 mddev->major_version = 0;
2727 mddev->minor_version = 90;
2730 if (strncmp(buf, "external:", 9) == 0) {
2731 int namelen = len-9;
2732 if (namelen >= sizeof(mddev->metadata_type))
2733 namelen = sizeof(mddev->metadata_type)-1;
2734 strncpy(mddev->metadata_type, buf+9, namelen);
2735 mddev->metadata_type[namelen] = 0;
2736 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2737 mddev->metadata_type[--namelen] = 0;
2738 mddev->persistent = 0;
2739 mddev->external = 1;
2740 mddev->major_version = 0;
2741 mddev->minor_version = 90;
2744 major = simple_strtoul(buf, &e, 10);
2745 if (e==buf || *e != '.')
2748 minor = simple_strtoul(buf, &e, 10);
2749 if (e==buf || (*e && *e != '\n') )
2751 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2753 mddev->major_version = major;
2754 mddev->minor_version = minor;
2755 mddev->persistent = 1;
2756 mddev->external = 0;
2760 static struct md_sysfs_entry md_metadata =
2761 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2764 action_show(mddev_t *mddev, char *page)
2766 char *type = "idle";
2767 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2768 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2769 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2771 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2772 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2774 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2781 return sprintf(page, "%s\n", type);
2785 action_store(mddev_t *mddev, const char *page, size_t len)
2787 if (!mddev->pers || !mddev->pers->sync_request)
2790 if (cmd_match(page, "idle")) {
2791 if (mddev->sync_thread) {
2792 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2793 md_unregister_thread(mddev->sync_thread);
2794 mddev->sync_thread = NULL;
2795 mddev->recovery = 0;
2797 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2798 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2800 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2801 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2802 else if (cmd_match(page, "reshape")) {
2804 if (mddev->pers->start_reshape == NULL)
2806 err = mddev->pers->start_reshape(mddev);
2810 if (cmd_match(page, "check"))
2811 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2812 else if (!cmd_match(page, "repair"))
2814 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2815 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2817 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2818 md_wakeup_thread(mddev->thread);
2823 mismatch_cnt_show(mddev_t *mddev, char *page)
2825 return sprintf(page, "%llu\n",
2826 (unsigned long long) mddev->resync_mismatches);
2829 static struct md_sysfs_entry md_scan_mode =
2830 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2833 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
2836 sync_min_show(mddev_t *mddev, char *page)
2838 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2839 mddev->sync_speed_min ? "local": "system");
2843 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2847 if (strncmp(buf, "system", 6)==0) {
2848 mddev->sync_speed_min = 0;
2851 min = simple_strtoul(buf, &e, 10);
2852 if (buf == e || (*e && *e != '\n') || min <= 0)
2854 mddev->sync_speed_min = min;
2858 static struct md_sysfs_entry md_sync_min =
2859 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2862 sync_max_show(mddev_t *mddev, char *page)
2864 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2865 mddev->sync_speed_max ? "local": "system");
2869 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2873 if (strncmp(buf, "system", 6)==0) {
2874 mddev->sync_speed_max = 0;
2877 max = simple_strtoul(buf, &e, 10);
2878 if (buf == e || (*e && *e != '\n') || max <= 0)
2880 mddev->sync_speed_max = max;
2884 static struct md_sysfs_entry md_sync_max =
2885 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2888 degraded_show(mddev_t *mddev, char *page)
2890 return sprintf(page, "%d\n", mddev->degraded);
2892 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
2895 sync_speed_show(mddev_t *mddev, char *page)
2897 unsigned long resync, dt, db;
2898 resync = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active));
2899 dt = ((jiffies - mddev->resync_mark) / HZ);
2901 db = resync - (mddev->resync_mark_cnt);
2902 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2905 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
2908 sync_completed_show(mddev_t *mddev, char *page)
2910 unsigned long max_blocks, resync;
2912 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2913 max_blocks = mddev->resync_max_sectors;
2915 max_blocks = mddev->size << 1;
2917 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2918 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2921 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
2924 suspend_lo_show(mddev_t *mddev, char *page)
2926 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2930 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2933 unsigned long long new = simple_strtoull(buf, &e, 10);
2935 if (mddev->pers->quiesce == NULL)
2937 if (buf == e || (*e && *e != '\n'))
2939 if (new >= mddev->suspend_hi ||
2940 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2941 mddev->suspend_lo = new;
2942 mddev->pers->quiesce(mddev, 2);
2947 static struct md_sysfs_entry md_suspend_lo =
2948 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2952 suspend_hi_show(mddev_t *mddev, char *page)
2954 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2958 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2961 unsigned long long new = simple_strtoull(buf, &e, 10);
2963 if (mddev->pers->quiesce == NULL)
2965 if (buf == e || (*e && *e != '\n'))
2967 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2968 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2969 mddev->suspend_hi = new;
2970 mddev->pers->quiesce(mddev, 1);
2971 mddev->pers->quiesce(mddev, 0);
2976 static struct md_sysfs_entry md_suspend_hi =
2977 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2980 reshape_position_show(mddev_t *mddev, char *page)
2982 if (mddev->reshape_position != MaxSector)
2983 return sprintf(page, "%llu\n",
2984 (unsigned long long)mddev->reshape_position);
2985 strcpy(page, "none\n");
2990 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
2993 unsigned long long new = simple_strtoull(buf, &e, 10);
2996 if (buf == e || (*e && *e != '\n'))
2998 mddev->reshape_position = new;
2999 mddev->delta_disks = 0;
3000 mddev->new_level = mddev->level;
3001 mddev->new_layout = mddev->layout;
3002 mddev->new_chunk = mddev->chunk_size;
3006 static struct md_sysfs_entry md_reshape_position =
3007 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3008 reshape_position_store);
3011 static struct attribute *md_default_attrs[] = {
3014 &md_raid_disks.attr,
3015 &md_chunk_size.attr,
3017 &md_resync_start.attr,
3019 &md_new_device.attr,
3020 &md_safe_delay.attr,
3021 &md_array_state.attr,
3022 &md_reshape_position.attr,
3026 static struct attribute *md_redundancy_attrs[] = {
3028 &md_mismatches.attr,
3031 &md_sync_speed.attr,
3032 &md_sync_completed.attr,
3033 &md_suspend_lo.attr,
3034 &md_suspend_hi.attr,
3039 static struct attribute_group md_redundancy_group = {
3041 .attrs = md_redundancy_attrs,
3046 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3048 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3049 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3054 rv = mddev_lock(mddev);
3056 rv = entry->show(mddev, page);
3057 mddev_unlock(mddev);
3063 md_attr_store(struct kobject *kobj, struct attribute *attr,
3064 const char *page, size_t length)
3066 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3067 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3072 if (!capable(CAP_SYS_ADMIN))
3074 rv = mddev_lock(mddev);
3076 rv = entry->store(mddev, page, length);
3077 mddev_unlock(mddev);
3082 static void md_free(struct kobject *ko)
3084 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3088 static struct sysfs_ops md_sysfs_ops = {
3089 .show = md_attr_show,
3090 .store = md_attr_store,
3092 static struct kobj_type md_ktype = {
3094 .sysfs_ops = &md_sysfs_ops,
3095 .default_attrs = md_default_attrs,
3100 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3102 static DEFINE_MUTEX(disks_mutex);
3103 mddev_t *mddev = mddev_find(dev);
3104 struct gendisk *disk;
3105 int partitioned = (MAJOR(dev) != MD_MAJOR);
3106 int shift = partitioned ? MdpMinorShift : 0;
3107 int unit = MINOR(dev) >> shift;
3113 mutex_lock(&disks_mutex);
3114 if (mddev->gendisk) {
3115 mutex_unlock(&disks_mutex);
3119 disk = alloc_disk(1 << shift);
3121 mutex_unlock(&disks_mutex);
3125 disk->major = MAJOR(dev);
3126 disk->first_minor = unit << shift;
3128 sprintf(disk->disk_name, "md_d%d", unit);
3130 sprintf(disk->disk_name, "md%d", unit);
3131 disk->fops = &md_fops;
3132 disk->private_data = mddev;
3133 disk->queue = mddev->queue;
3135 mddev->gendisk = disk;
3136 mutex_unlock(&disks_mutex);
3137 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3140 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3143 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3147 static void md_safemode_timeout(unsigned long data)
3149 mddev_t *mddev = (mddev_t *) data;
3151 mddev->safemode = 1;
3152 md_wakeup_thread(mddev->thread);
3155 static int start_dirty_degraded;
3157 static int do_md_run(mddev_t * mddev)
3161 struct list_head *tmp;
3163 struct gendisk *disk;
3164 struct mdk_personality *pers;
3165 char b[BDEVNAME_SIZE];
3167 if (list_empty(&mddev->disks))
3168 /* cannot run an array with no devices.. */
3175 * Analyze all RAID superblock(s)
3177 if (!mddev->raid_disks)
3180 chunk_size = mddev->chunk_size;
3183 if (chunk_size > MAX_CHUNK_SIZE) {
3184 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3185 chunk_size, MAX_CHUNK_SIZE);
3189 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3191 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3192 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3195 if (chunk_size < PAGE_SIZE) {
3196 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3197 chunk_size, PAGE_SIZE);
3201 /* devices must have minimum size of one chunk */
3202 ITERATE_RDEV(mddev,rdev,tmp) {
3203 if (test_bit(Faulty, &rdev->flags))
3205 if (rdev->size < chunk_size / 1024) {
3207 "md: Dev %s smaller than chunk_size:"
3209 bdevname(rdev->bdev,b),
3210 (unsigned long long)rdev->size,
3218 if (mddev->level != LEVEL_NONE)
3219 request_module("md-level-%d", mddev->level);
3220 else if (mddev->clevel[0])
3221 request_module("md-%s", mddev->clevel);
3225 * Drop all container device buffers, from now on
3226 * the only valid external interface is through the md
3229 ITERATE_RDEV(mddev,rdev,tmp) {
3230 if (test_bit(Faulty, &rdev->flags))
3232 sync_blockdev(rdev->bdev);
3233 invalidate_bdev(rdev->bdev);
3235 /* perform some consistency tests on the device.
3236 * We don't want the data to overlap the metadata,
3237 * Internal Bitmap issues has handled elsewhere.
3239 if (rdev->data_offset < rdev->sb_offset) {
3241 rdev->data_offset + mddev->size*2
3242 > rdev->sb_offset*2) {
3243 printk("md: %s: data overlaps metadata\n",
3248 if (rdev->sb_offset*2 + rdev->sb_size/512
3249 > rdev->data_offset) {
3250 printk("md: %s: metadata overlaps data\n",
3257 md_probe(mddev->unit, NULL, NULL);
3258 disk = mddev->gendisk;
3262 spin_lock(&pers_lock);
3263 pers = find_pers(mddev->level, mddev->clevel);
3264 if (!pers || !try_module_get(pers->owner)) {
3265 spin_unlock(&pers_lock);
3266 if (mddev->level != LEVEL_NONE)
3267 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3270 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3275 spin_unlock(&pers_lock);
3276 mddev->level = pers->level;
3277 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3279 if (mddev->reshape_position != MaxSector &&
3280 pers->start_reshape == NULL) {
3281 /* This personality cannot handle reshaping... */
3283 module_put(pers->owner);
3287 if (pers->sync_request) {
3288 /* Warn if this is a potentially silly
3291 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3293 struct list_head *tmp2;
3295 ITERATE_RDEV(mddev, rdev, tmp) {
3296 ITERATE_RDEV(mddev, rdev2, tmp2) {
3298 rdev->bdev->bd_contains ==
3299 rdev2->bdev->bd_contains) {
3301 "%s: WARNING: %s appears to be"
3302 " on the same physical disk as"
3305 bdevname(rdev->bdev,b),
3306 bdevname(rdev2->bdev,b2));
3313 "True protection against single-disk"
3314 " failure might be compromised.\n");
3317 mddev->recovery = 0;
3318 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3319 mddev->barriers_work = 1;
3320 mddev->ok_start_degraded = start_dirty_degraded;
3323 mddev->ro = 2; /* read-only, but switch on first write */
3325 err = mddev->pers->run(mddev);
3326 if (!err && mddev->pers->sync_request) {
3327 err = bitmap_create(mddev);
3329 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3330 mdname(mddev), err);
3331 mddev->pers->stop(mddev);
3335 printk(KERN_ERR "md: pers->run() failed ...\n");
3336 module_put(mddev->pers->owner);
3338 bitmap_destroy(mddev);
3341 if (mddev->pers->sync_request) {
3342 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3344 "md: cannot register extra attributes for %s\n",
3346 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3349 atomic_set(&mddev->writes_pending,0);
3350 mddev->safemode = 0;
3351 mddev->safemode_timer.function = md_safemode_timeout;
3352 mddev->safemode_timer.data = (unsigned long) mddev;
3353 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3356 ITERATE_RDEV(mddev,rdev,tmp)
3357 if (rdev->raid_disk >= 0) {
3359 sprintf(nm, "rd%d", rdev->raid_disk);
3360 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3361 printk("md: cannot register %s for %s\n",
3365 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3368 md_update_sb(mddev, 0);
3370 set_capacity(disk, mddev->array_size<<1);
3372 /* If we call blk_queue_make_request here, it will
3373 * re-initialise max_sectors etc which may have been
3374 * refined inside -> run. So just set the bits we need to set.
3375 * Most initialisation happended when we called
3376 * blk_queue_make_request(..., md_fail_request)
3379 mddev->queue->queuedata = mddev;
3380 mddev->queue->make_request_fn = mddev->pers->make_request;
3382 /* If there is a partially-recovered drive we need to
3383 * start recovery here. If we leave it to md_check_recovery,
3384 * it will remove the drives and not do the right thing
3386 if (mddev->degraded && !mddev->sync_thread) {
3387 struct list_head *rtmp;
3389 ITERATE_RDEV(mddev,rdev,rtmp)
3390 if (rdev->raid_disk >= 0 &&
3391 !test_bit(In_sync, &rdev->flags) &&
3392 !test_bit(Faulty, &rdev->flags))
3393 /* complete an interrupted recovery */
3395 if (spares && mddev->pers->sync_request) {
3396 mddev->recovery = 0;
3397 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3398 mddev->sync_thread = md_register_thread(md_do_sync,
3401 if (!mddev->sync_thread) {
3402 printk(KERN_ERR "%s: could not start resync"
3405 /* leave the spares where they are, it shouldn't hurt */
3406 mddev->recovery = 0;
3410 md_wakeup_thread(mddev->thread);
3411 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3414 md_new_event(mddev);
3415 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
3419 static int restart_array(mddev_t *mddev)
3421 struct gendisk *disk = mddev->gendisk;
3425 * Complain if it has no devices
3428 if (list_empty(&mddev->disks))
3436 mddev->safemode = 0;
3438 set_disk_ro(disk, 0);
3440 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3443 * Kick recovery or resync if necessary
3445 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3446 md_wakeup_thread(mddev->thread);
3447 md_wakeup_thread(mddev->sync_thread);
3456 /* similar to deny_write_access, but accounts for our holding a reference
3457 * to the file ourselves */
3458 static int deny_bitmap_write_access(struct file * file)
3460 struct inode *inode = file->f_mapping->host;
3462 spin_lock(&inode->i_lock);
3463 if (atomic_read(&inode->i_writecount) > 1) {
3464 spin_unlock(&inode->i_lock);
3467 atomic_set(&inode->i_writecount, -1);
3468 spin_unlock(&inode->i_lock);
3473 static void restore_bitmap_write_access(struct file *file)
3475 struct inode *inode = file->f_mapping->host;
3477 spin_lock(&inode->i_lock);
3478 atomic_set(&inode->i_writecount, 1);
3479 spin_unlock(&inode->i_lock);
3483 * 0 - completely stop and dis-assemble array
3484 * 1 - switch to readonly
3485 * 2 - stop but do not disassemble array
3487 static int do_md_stop(mddev_t * mddev, int mode)
3490 struct gendisk *disk = mddev->gendisk;
3493 if (atomic_read(&mddev->active)>2) {
3494 printk("md: %s still in use.\n",mdname(mddev));
3498 if (mddev->sync_thread) {
3499 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3500 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3501 md_unregister_thread(mddev->sync_thread);
3502 mddev->sync_thread = NULL;
3505 del_timer_sync(&mddev->safemode_timer);
3507 invalidate_partition(disk, 0);
3510 case 1: /* readonly */
3516 case 0: /* disassemble */
3518 bitmap_flush(mddev);
3519 md_super_wait(mddev);
3521 set_disk_ro(disk, 0);
3522 blk_queue_make_request(mddev->queue, md_fail_request);
3523 mddev->pers->stop(mddev);
3524 mddev->queue->merge_bvec_fn = NULL;
3525 mddev->queue->unplug_fn = NULL;
3526 mddev->queue->backing_dev_info.congested_fn = NULL;
3527 if (mddev->pers->sync_request)
3528 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3530 module_put(mddev->pers->owner);
3533 set_capacity(disk, 0);
3539 if (!mddev->in_sync || mddev->flags) {
3540 /* mark array as shutdown cleanly */
3542 md_update_sb(mddev, 1);
3545 set_disk_ro(disk, 1);
3546 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3550 * Free resources if final stop
3554 struct list_head *tmp;
3556 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3558 bitmap_destroy(mddev);
3559 if (mddev->bitmap_file) {
3560 restore_bitmap_write_access(mddev->bitmap_file);
3561 fput(mddev->bitmap_file);
3562 mddev->bitmap_file = NULL;
3564 mddev->bitmap_offset = 0;
3566 ITERATE_RDEV(mddev,rdev,tmp)
3567 if (rdev->raid_disk >= 0) {
3569 sprintf(nm, "rd%d", rdev->raid_disk);
3570 sysfs_remove_link(&mddev->kobj, nm);
3573 /* make sure all delayed_delete calls have finished */
3574 flush_scheduled_work();
3576 export_array(mddev);
3578 mddev->array_size = 0;
3580 mddev->raid_disks = 0;
3581 mddev->recovery_cp = 0;
3582 mddev->reshape_position = MaxSector;
3583 mddev->external = 0;
3585 } else if (mddev->pers)
3586 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3589 md_new_event(mddev);
3595 static void autorun_array(mddev_t *mddev)
3598 struct list_head *tmp;
3601 if (list_empty(&mddev->disks))
3604 printk(KERN_INFO "md: running: ");
3606 ITERATE_RDEV(mddev,rdev,tmp) {
3607 char b[BDEVNAME_SIZE];
3608 printk("<%s>", bdevname(rdev->bdev,b));
3612 err = do_md_run (mddev);
3614 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3615 do_md_stop (mddev, 0);
3620 * lets try to run arrays based on all disks that have arrived
3621 * until now. (those are in pending_raid_disks)
3623 * the method: pick the first pending disk, collect all disks with
3624 * the same UUID, remove all from the pending list and put them into
3625 * the 'same_array' list. Then order this list based on superblock
3626 * update time (freshest comes first), kick out 'old' disks and
3627 * compare superblocks. If everything's fine then run it.
3629 * If "unit" is allocated, then bump its reference count
3631 static void autorun_devices(int part)
3633 struct list_head *tmp;
3634 mdk_rdev_t *rdev0, *rdev;
3636 char b[BDEVNAME_SIZE];
3638 printk(KERN_INFO "md: autorun ...\n");
3639 while (!list_empty(&pending_raid_disks)) {
3642 LIST_HEAD(candidates);
3643 rdev0 = list_entry(pending_raid_disks.next,
3644 mdk_rdev_t, same_set);
3646 printk(KERN_INFO "md: considering %s ...\n",
3647 bdevname(rdev0->bdev,b));
3648 INIT_LIST_HEAD(&candidates);
3649 ITERATE_RDEV_PENDING(rdev,tmp)
3650 if (super_90_load(rdev, rdev0, 0) >= 0) {
3651 printk(KERN_INFO "md: adding %s ...\n",
3652 bdevname(rdev->bdev,b));
3653 list_move(&rdev->same_set, &candidates);
3656 * now we have a set of devices, with all of them having
3657 * mostly sane superblocks. It's time to allocate the
3661 dev = MKDEV(mdp_major,
3662 rdev0->preferred_minor << MdpMinorShift);
3663 unit = MINOR(dev) >> MdpMinorShift;
3665 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3668 if (rdev0->preferred_minor != unit) {
3669 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3670 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3674 md_probe(dev, NULL, NULL);
3675 mddev = mddev_find(dev);
3678 "md: cannot allocate memory for md drive.\n");
3681 if (mddev_lock(mddev))
3682 printk(KERN_WARNING "md: %s locked, cannot run\n",
3684 else if (mddev->raid_disks || mddev->major_version
3685 || !list_empty(&mddev->disks)) {
3687 "md: %s already running, cannot run %s\n",
3688 mdname(mddev), bdevname(rdev0->bdev,b));
3689 mddev_unlock(mddev);
3691 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3692 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3693 list_del_init(&rdev->same_set);
3694 if (bind_rdev_to_array(rdev, mddev))
3697 autorun_array(mddev);
3698 mddev_unlock(mddev);
3700 /* on success, candidates will be empty, on error
3703 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3707 printk(KERN_INFO "md: ... autorun DONE.\n");
3709 #endif /* !MODULE */
3711 static int get_version(void __user * arg)
3715 ver.major = MD_MAJOR_VERSION;
3716 ver.minor = MD_MINOR_VERSION;
3717 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3719 if (copy_to_user(arg, &ver, sizeof(ver)))
3725 static int get_array_info(mddev_t * mddev, void __user * arg)
3727 mdu_array_info_t info;
3728 int nr,working,active,failed,spare;
3730 struct list_head *tmp;
3732 nr=working=active=failed=spare=0;
3733 ITERATE_RDEV(mddev,rdev,tmp) {
3735 if (test_bit(Faulty, &rdev->flags))
3739 if (test_bit(In_sync, &rdev->flags))
3746 info.major_version = mddev->major_version;
3747 info.minor_version = mddev->minor_version;
3748 info.patch_version = MD_PATCHLEVEL_VERSION;
3749 info.ctime = mddev->ctime;
3750 info.level = mddev->level;
3751 info.size = mddev->size;
3752 if (info.size != mddev->size) /* overflow */
3755 info.raid_disks = mddev->raid_disks;
3756 info.md_minor = mddev->md_minor;
3757 info.not_persistent= !mddev->persistent;
3759 info.utime = mddev->utime;
3762 info.state = (1<<MD_SB_CLEAN);
3763 if (mddev->bitmap && mddev->bitmap_offset)
3764 info.state = (1<<MD_SB_BITMAP_PRESENT);
3765 info.active_disks = active;
3766 info.working_disks = working;
3767 info.failed_disks = failed;
3768 info.spare_disks = spare;
3770 info.layout = mddev->layout;
3771 info.chunk_size = mddev->chunk_size;
3773 if (copy_to_user(arg, &info, sizeof(info)))
3779 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
3781 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3782 char *ptr, *buf = NULL;
3785 md_allow_write(mddev);
3787 file = kmalloc(sizeof(*file), GFP_KERNEL);
3791 /* bitmap disabled, zero the first byte and copy out */
3792 if (!mddev->bitmap || !mddev->bitmap->file) {
3793 file->pathname[0] = '\0';
3797 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3801 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3805 strcpy(file->pathname, ptr);
3809 if (copy_to_user(arg, file, sizeof(*file)))
3817 static int get_disk_info(mddev_t * mddev, void __user * arg)
3819 mdu_disk_info_t info;
3823 if (copy_from_user(&info, arg, sizeof(info)))
3828 rdev = find_rdev_nr(mddev, nr);
3830 info.major = MAJOR(rdev->bdev->bd_dev);
3831 info.minor = MINOR(rdev->bdev->bd_dev);
3832 info.raid_disk = rdev->raid_disk;
3834 if (test_bit(Faulty, &rdev->flags))
3835 info.state |= (1<<MD_DISK_FAULTY);
3836 else if (test_bit(In_sync, &rdev->flags)) {
3837 info.state |= (1<<MD_DISK_ACTIVE);
3838 info.state |= (1<<MD_DISK_SYNC);
3840 if (test_bit(WriteMostly, &rdev->flags))
3841 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3843 info.major = info.minor = 0;
3844 info.raid_disk = -1;
3845 info.state = (1<<MD_DISK_REMOVED);
3848 if (copy_to_user(arg, &info, sizeof(info)))
3854 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3856 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3858 dev_t dev = MKDEV(info->major,info->minor);
3860 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3863 if (!mddev->raid_disks) {
3865 /* expecting a device which has a superblock */
3866 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3869 "md: md_import_device returned %ld\n",
3871 return PTR_ERR(rdev);
3873 if (!list_empty(&mddev->disks)) {
3874 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3875 mdk_rdev_t, same_set);
3876 int err = super_types[mddev->major_version]
3877 .load_super(rdev, rdev0, mddev->minor_version);
3880 "md: %s has different UUID to %s\n",
3881 bdevname(rdev->bdev,b),
3882 bdevname(rdev0->bdev,b2));
3887 err = bind_rdev_to_array(rdev, mddev);
3894 * add_new_disk can be used once the array is assembled
3895 * to add "hot spares". They must already have a superblock
3900 if (!mddev->pers->hot_add_disk) {
3902 "%s: personality does not support diskops!\n",
3906 if (mddev->persistent)
3907 rdev = md_import_device(dev, mddev->major_version,
3908 mddev->minor_version);
3910 rdev = md_import_device(dev, -1, -1);
3913 "md: md_import_device returned %ld\n",
3915 return PTR_ERR(rdev);
3917 /* set save_raid_disk if appropriate */
3918 if (!mddev->persistent) {
3919 if (info->state & (1<<MD_DISK_SYNC) &&
3920 info->raid_disk < mddev->raid_disks)
3921 rdev->raid_disk = info->raid_disk;
3923 rdev->raid_disk = -1;
3925 super_types[mddev->major_version].
3926 validate_super(mddev, rdev);
3927 rdev->saved_raid_disk = rdev->raid_disk;
3929 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3930 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3931 set_bit(WriteMostly, &rdev->flags);
3933 rdev->raid_disk = -1;
3934 err = bind_rdev_to_array(rdev, mddev);
3935 if (!err && !mddev->pers->hot_remove_disk) {
3936 /* If there is hot_add_disk but no hot_remove_disk
3937 * then added disks for geometry changes,
3938 * and should be added immediately.
3940 super_types[mddev->major_version].
3941 validate_super(mddev, rdev);
3942 err = mddev->pers->hot_add_disk(mddev, rdev);
3944 unbind_rdev_from_array(rdev);
3949 md_update_sb(mddev, 1);
3950 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3951 md_wakeup_thread(mddev->thread);
3955 /* otherwise, add_new_disk is only allowed
3956 * for major_version==0 superblocks
3958 if (mddev->major_version != 0) {
3959 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3964 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3966 rdev = md_import_device (dev, -1, 0);
3969 "md: error, md_import_device() returned %ld\n",
3971 return PTR_ERR(rdev);
3973 rdev->desc_nr = info->number;
3974 if (info->raid_disk < mddev->raid_disks)
3975 rdev->raid_disk = info->raid_disk;
3977 rdev->raid_disk = -1;
3981 if (rdev->raid_disk < mddev->raid_disks)
3982 if (info->state & (1<<MD_DISK_SYNC))
3983 set_bit(In_sync, &rdev->flags);
3985 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3986 set_bit(WriteMostly, &rdev->flags);
3988 if (!mddev->persistent) {
3989 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3990 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3992 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3993 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3995 err = bind_rdev_to_array(rdev, mddev);
4005 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4007 char b[BDEVNAME_SIZE];
4013 rdev = find_rdev(mddev, dev);
4017 if (rdev->raid_disk >= 0)
4020 kick_rdev_from_array(rdev);
4021 md_update_sb(mddev, 1);
4022 md_new_event(mddev);
4026 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
4027 bdevname(rdev->bdev,b), mdname(mddev));
4031 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4033 char b[BDEVNAME_SIZE];
4041 if (mddev->major_version != 0) {
4042 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4043 " version-0 superblocks.\n",
4047 if (!mddev->pers->hot_add_disk) {
4049 "%s: personality does not support diskops!\n",
4054 rdev = md_import_device (dev, -1, 0);
4057 "md: error, md_import_device() returned %ld\n",
4062 if (mddev->persistent)
4063 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
4066 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4068 size = calc_dev_size(rdev, mddev->chunk_size);
4071 if (test_bit(Faulty, &rdev->flags)) {
4073 "md: can not hot-add faulty %s disk to %s!\n",
4074 bdevname(rdev->bdev,b), mdname(mddev));
4078 clear_bit(In_sync, &rdev->flags);
4080 rdev->saved_raid_disk = -1;
4081 err = bind_rdev_to_array(rdev, mddev);
4086 * The rest should better be atomic, we can have disk failures
4087 * noticed in interrupt contexts ...
4090 if (rdev->desc_nr == mddev->max_disks) {
4091 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4094 goto abort_unbind_export;
4097 rdev->raid_disk = -1;
4099 md_update_sb(mddev, 1);
4102 * Kick recovery, maybe this spare has to be added to the
4103 * array immediately.
4105 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4106 md_wakeup_thread(mddev->thread);
4107 md_new_event(mddev);
4110 abort_unbind_export:
4111 unbind_rdev_from_array(rdev);
4118 static int set_bitmap_file(mddev_t *mddev, int fd)
4123 if (!mddev->pers->quiesce)
4125 if (mddev->recovery || mddev->sync_thread)
4127 /* we should be able to change the bitmap.. */
4133 return -EEXIST; /* cannot add when bitmap is present */
4134 mddev->bitmap_file = fget(fd);
4136 if (mddev->bitmap_file == NULL) {
4137 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4142 err = deny_bitmap_write_access(mddev->bitmap_file);
4144 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4146 fput(mddev->bitmap_file);
4147 mddev->bitmap_file = NULL;
4150 mddev->bitmap_offset = 0; /* file overrides offset */
4151 } else if (mddev->bitmap == NULL)
4152 return -ENOENT; /* cannot remove what isn't there */
4155 mddev->pers->quiesce(mddev, 1);
4157 err = bitmap_create(mddev);
4158 if (fd < 0 || err) {
4159 bitmap_destroy(mddev);
4160 fd = -1; /* make sure to put the file */
4162 mddev->pers->quiesce(mddev, 0);
4165 if (mddev->bitmap_file) {
4166 restore_bitmap_write_access(mddev->bitmap_file);
4167 fput(mddev->bitmap_file);
4169 mddev->bitmap_file = NULL;
4176 * set_array_info is used two different ways
4177 * The original usage is when creating a new array.
4178 * In this usage, raid_disks is > 0 and it together with
4179 * level, size, not_persistent,layout,chunksize determine the
4180 * shape of the array.
4181 * This will always create an array with a type-0.90.0 superblock.
4182 * The newer usage is when assembling an array.
4183 * In this case raid_disks will be 0, and the major_version field is
4184 * use to determine which style super-blocks are to be found on the devices.
4185 * The minor and patch _version numbers are also kept incase the
4186 * super_block handler wishes to interpret them.
4188 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4191 if (info->raid_disks == 0) {
4192 /* just setting version number for superblock loading */
4193 if (info->major_version < 0 ||
4194 info->major_version >= ARRAY_SIZE(super_types) ||
4195 super_types[info->major_version].name == NULL) {
4196 /* maybe try to auto-load a module? */
4198 "md: superblock version %d not known\n",
4199 info->major_version);
4202 mddev->major_version = info->major_version;
4203 mddev->minor_version = info->minor_version;
4204 mddev->patch_version = info->patch_version;
4205 mddev->persistent = !info->not_persistent;
4208 mddev->major_version = MD_MAJOR_VERSION;
4209 mddev->minor_version = MD_MINOR_VERSION;
4210 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4211 mddev->ctime = get_seconds();
4213 mddev->level = info->level;
4214 mddev->clevel[0] = 0;
4215 mddev->size = info->size;
4216 mddev->raid_disks = info->raid_disks;
4217 /* don't set md_minor, it is determined by which /dev/md* was
4220 if (info->state & (1<<MD_SB_CLEAN))
4221 mddev->recovery_cp = MaxSector;
4223 mddev->recovery_cp = 0;
4224 mddev->persistent = ! info->not_persistent;
4225 mddev->external = 0;
4227 mddev->layout = info->layout;
4228 mddev->chunk_size = info->chunk_size;
4230 mddev->max_disks = MD_SB_DISKS;
4232 if (mddev->persistent)
4234 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4236 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4237 mddev->bitmap_offset = 0;
4239 mddev->reshape_position = MaxSector;
4242 * Generate a 128 bit UUID
4244 get_random_bytes(mddev->uuid, 16);
4246 mddev->new_level = mddev->level;
4247 mddev->new_chunk = mddev->chunk_size;
4248 mddev->new_layout = mddev->layout;
4249 mddev->delta_disks = 0;
4254 static int update_size(mddev_t *mddev, unsigned long size)
4258 struct list_head *tmp;
4259 int fit = (size == 0);
4261 if (mddev->pers->resize == NULL)
4263 /* The "size" is the amount of each device that is used.
4264 * This can only make sense for arrays with redundancy.
4265 * linear and raid0 always use whatever space is available
4266 * We can only consider changing the size if no resync
4267 * or reconstruction is happening, and if the new size
4268 * is acceptable. It must fit before the sb_offset or,
4269 * if that is <data_offset, it must fit before the
4270 * size of each device.
4271 * If size is zero, we find the largest size that fits.
4273 if (mddev->sync_thread)
4275 ITERATE_RDEV(mddev,rdev,tmp) {
4277 avail = rdev->size * 2;
4279 if (fit && (size == 0 || size > avail/2))
4281 if (avail < ((sector_t)size << 1))
4284 rv = mddev->pers->resize(mddev, (sector_t)size *2);
4286 struct block_device *bdev;
4288 bdev = bdget_disk(mddev->gendisk, 0);
4290 mutex_lock(&bdev->bd_inode->i_mutex);
4291 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
4292 mutex_unlock(&bdev->bd_inode->i_mutex);
4299 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4302 /* change the number of raid disks */
4303 if (mddev->pers->check_reshape == NULL)
4305 if (raid_disks <= 0 ||
4306 raid_disks >= mddev->max_disks)
4308 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4310 mddev->delta_disks = raid_disks - mddev->raid_disks;
4312 rv = mddev->pers->check_reshape(mddev);
4318 * update_array_info is used to change the configuration of an
4320 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4321 * fields in the info are checked against the array.
4322 * Any differences that cannot be handled will cause an error.
4323 * Normally, only one change can be managed at a time.
4325 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4331 /* calculate expected state,ignoring low bits */
4332 if (mddev->bitmap && mddev->bitmap_offset)
4333 state |= (1 << MD_SB_BITMAP_PRESENT);
4335 if (mddev->major_version != info->major_version ||
4336 mddev->minor_version != info->minor_version ||
4337 /* mddev->patch_version != info->patch_version || */
4338 mddev->ctime != info->ctime ||
4339 mddev->level != info->level ||
4340 /* mddev->layout != info->layout || */
4341 !mddev->persistent != info->not_persistent||
4342 mddev->chunk_size != info->chunk_size ||
4343 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4344 ((state^info->state) & 0xfffffe00)
4347 /* Check there is only one change */
4348 if (info->size >= 0 && mddev->size != info->size) cnt++;
4349 if (mddev->raid_disks != info->raid_disks) cnt++;
4350 if (mddev->layout != info->layout) cnt++;
4351 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4352 if (cnt == 0) return 0;
4353 if (cnt > 1) return -EINVAL;
4355 if (mddev->layout != info->layout) {
4357 * we don't need to do anything at the md level, the
4358 * personality will take care of it all.
4360 if (mddev->pers->reconfig == NULL)
4363 return mddev->pers->reconfig(mddev, info->layout, -1);
4365 if (info->size >= 0 && mddev->size != info->size)
4366 rv = update_size(mddev, info->size);
4368 if (mddev->raid_disks != info->raid_disks)
4369 rv = update_raid_disks(mddev, info->raid_disks);
4371 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4372 if (mddev->pers->quiesce == NULL)
4374 if (mddev->recovery || mddev->sync_thread)
4376 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4377 /* add the bitmap */
4380 if (mddev->default_bitmap_offset == 0)
4382 mddev->bitmap_offset = mddev->default_bitmap_offset;
4383 mddev->pers->quiesce(mddev, 1);
4384 rv = bitmap_create(mddev);
4386 bitmap_destroy(mddev);
4387 mddev->pers->quiesce(mddev, 0);
4389 /* remove the bitmap */
4392 if (mddev->bitmap->file)
4394 mddev->pers->quiesce(mddev, 1);
4395 bitmap_destroy(mddev);
4396 mddev->pers->quiesce(mddev, 0);
4397 mddev->bitmap_offset = 0;
4400 md_update_sb(mddev, 1);
4404 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4408 if (mddev->pers == NULL)
4411 rdev = find_rdev(mddev, dev);
4415 md_error(mddev, rdev);
4419 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4421 mddev_t *mddev = bdev->bd_disk->private_data;
4425 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4429 static int md_ioctl(struct inode *inode, struct file *file,
4430 unsigned int cmd, unsigned long arg)
4433 void __user *argp = (void __user *)arg;
4434 mddev_t *mddev = NULL;
4436 if (!capable(CAP_SYS_ADMIN))
4440 * Commands dealing with the RAID driver but not any
4446 err = get_version(argp);
4449 case PRINT_RAID_DEBUG:
4457 autostart_arrays(arg);
4464 * Commands creating/starting a new array:
4467 mddev = inode->i_bdev->bd_disk->private_data;
4474 err = mddev_lock(mddev);
4477 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4484 case SET_ARRAY_INFO:
4486 mdu_array_info_t info;
4488 memset(&info, 0, sizeof(info));
4489 else if (copy_from_user(&info, argp, sizeof(info))) {
4494 err = update_array_info(mddev, &info);
4496 printk(KERN_WARNING "md: couldn't update"
4497 " array info. %d\n", err);
4502 if (!list_empty(&mddev->disks)) {
4504 "md: array %s already has disks!\n",
4509 if (mddev->raid_disks) {
4511 "md: array %s already initialised!\n",
4516 err = set_array_info(mddev, &info);
4518 printk(KERN_WARNING "md: couldn't set"
4519 " array info. %d\n", err);
4529 * Commands querying/configuring an existing array:
4531 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4532 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4533 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4534 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4535 && cmd != GET_BITMAP_FILE) {
4541 * Commands even a read-only array can execute:
4545 case GET_ARRAY_INFO:
4546 err = get_array_info(mddev, argp);
4549 case GET_BITMAP_FILE:
4550 err = get_bitmap_file(mddev, argp);
4554 err = get_disk_info(mddev, argp);
4557 case RESTART_ARRAY_RW:
4558 err = restart_array(mddev);
4562 err = do_md_stop (mddev, 0);
4566 err = do_md_stop (mddev, 1);
4570 * We have a problem here : there is no easy way to give a CHS
4571 * virtual geometry. We currently pretend that we have a 2 heads
4572 * 4 sectors (with a BIG number of cylinders...). This drives
4573 * dosfs just mad... ;-)
4578 * The remaining ioctls are changing the state of the
4579 * superblock, so we do not allow them on read-only arrays.
4580 * However non-MD ioctls (e.g. get-size) will still come through
4581 * here and hit the 'default' below, so only disallow
4582 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4584 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4585 mddev->ro && mddev->pers) {
4586 if (mddev->ro == 2) {
4588 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4589 md_wakeup_thread(mddev->thread);
4601 mdu_disk_info_t info;
4602 if (copy_from_user(&info, argp, sizeof(info)))
4605 err = add_new_disk(mddev, &info);
4609 case HOT_REMOVE_DISK:
4610 err = hot_remove_disk(mddev, new_decode_dev(arg));
4614 err = hot_add_disk(mddev, new_decode_dev(arg));
4617 case SET_DISK_FAULTY:
4618 err = set_disk_faulty(mddev, new_decode_dev(arg));
4622 err = do_md_run (mddev);
4625 case SET_BITMAP_FILE:
4626 err = set_bitmap_file(mddev, (int)arg);
4636 mddev_unlock(mddev);
4646 static int md_open(struct inode *inode, struct file *file)
4649 * Succeed if we can lock the mddev, which confirms that
4650 * it isn't being stopped right now.
4652 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4655 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
4660 mddev_unlock(mddev);
4662 check_disk_change(inode->i_bdev);
4667 static int md_release(struct inode *inode, struct file * file)
4669 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4677 static int md_media_changed(struct gendisk *disk)
4679 mddev_t *mddev = disk->private_data;
4681 return mddev->changed;
4684 static int md_revalidate(struct gendisk *disk)
4686 mddev_t *mddev = disk->private_data;
4691 static struct block_device_operations md_fops =
4693 .owner = THIS_MODULE,
4695 .release = md_release,
4697 .getgeo = md_getgeo,
4698 .media_changed = md_media_changed,
4699 .revalidate_disk= md_revalidate,
4702 static int md_thread(void * arg)
4704 mdk_thread_t *thread = arg;
4707 * md_thread is a 'system-thread', it's priority should be very
4708 * high. We avoid resource deadlocks individually in each
4709 * raid personality. (RAID5 does preallocation) We also use RR and
4710 * the very same RT priority as kswapd, thus we will never get
4711 * into a priority inversion deadlock.
4713 * we definitely have to have equal or higher priority than
4714 * bdflush, otherwise bdflush will deadlock if there are too
4715 * many dirty RAID5 blocks.
4718 allow_signal(SIGKILL);
4719 while (!kthread_should_stop()) {
4721 /* We need to wait INTERRUPTIBLE so that
4722 * we don't add to the load-average.
4723 * That means we need to be sure no signals are
4726 if (signal_pending(current))
4727 flush_signals(current);
4729 wait_event_interruptible_timeout
4731 test_bit(THREAD_WAKEUP, &thread->flags)
4732 || kthread_should_stop(),
4735 clear_bit(THREAD_WAKEUP, &thread->flags);
4737 thread->run(thread->mddev);
4743 void md_wakeup_thread(mdk_thread_t *thread)
4746 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4747 set_bit(THREAD_WAKEUP, &thread->flags);
4748 wake_up(&thread->wqueue);
4752 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4755 mdk_thread_t *thread;
4757 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
4761 init_waitqueue_head(&thread->wqueue);
4764 thread->mddev = mddev;
4765 thread->timeout = MAX_SCHEDULE_TIMEOUT;
4766 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
4767 if (IS_ERR(thread->tsk)) {
4774 void md_unregister_thread(mdk_thread_t *thread)
4776 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
4778 kthread_stop(thread->tsk);
4782 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4789 if (!rdev || test_bit(Faulty, &rdev->flags))
4792 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4794 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4795 __builtin_return_address(0),__builtin_return_address(1),
4796 __builtin_return_address(2),__builtin_return_address(3));
4800 if (!mddev->pers->error_handler)
4802 mddev->pers->error_handler(mddev,rdev);
4803 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4804 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4805 md_wakeup_thread(mddev->thread);
4806 md_new_event_inintr(mddev);
4809 /* seq_file implementation /proc/mdstat */
4811 static void status_unused(struct seq_file *seq)
4815 struct list_head *tmp;
4817 seq_printf(seq, "unused devices: ");
4819 ITERATE_RDEV_PENDING(rdev,tmp) {
4820 char b[BDEVNAME_SIZE];
4822 seq_printf(seq, "%s ",
4823 bdevname(rdev->bdev,b));
4826 seq_printf(seq, "<none>");
4828 seq_printf(seq, "\n");
4832 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4834 sector_t max_blocks, resync, res;
4835 unsigned long dt, db, rt;
4837 unsigned int per_milli;
4839 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4841 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4842 max_blocks = mddev->resync_max_sectors >> 1;
4844 max_blocks = mddev->size;
4847 * Should not happen.
4853 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4854 * in a sector_t, and (max_blocks>>scale) will fit in a
4855 * u32, as those are the requirements for sector_div.
4856 * Thus 'scale' must be at least 10
4859 if (sizeof(sector_t) > sizeof(unsigned long)) {
4860 while ( max_blocks/2 > (1ULL<<(scale+32)))
4863 res = (resync>>scale)*1000;
4864 sector_div(res, (u32)((max_blocks>>scale)+1));
4868 int i, x = per_milli/50, y = 20-x;
4869 seq_printf(seq, "[");
4870 for (i = 0; i < x; i++)
4871 seq_printf(seq, "=");
4872 seq_printf(seq, ">");
4873 for (i = 0; i < y; i++)
4874 seq_printf(seq, ".");
4875 seq_printf(seq, "] ");
4877 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
4878 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4880 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
4882 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4883 "resync" : "recovery"))),
4884 per_milli/10, per_milli % 10,
4885 (unsigned long long) resync,
4886 (unsigned long long) max_blocks);
4889 * We do not want to overflow, so the order of operands and
4890 * the * 100 / 100 trick are important. We do a +1 to be
4891 * safe against division by zero. We only estimate anyway.
4893 * dt: time from mark until now
4894 * db: blocks written from mark until now
4895 * rt: remaining time
4897 dt = ((jiffies - mddev->resync_mark) / HZ);
4899 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
4900 - mddev->resync_mark_cnt;
4901 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
4903 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4905 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
4908 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4910 struct list_head *tmp;
4920 spin_lock(&all_mddevs_lock);
4921 list_for_each(tmp,&all_mddevs)
4923 mddev = list_entry(tmp, mddev_t, all_mddevs);
4925 spin_unlock(&all_mddevs_lock);
4928 spin_unlock(&all_mddevs_lock);
4930 return (void*)2;/* tail */
4934 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4936 struct list_head *tmp;
4937 mddev_t *next_mddev, *mddev = v;
4943 spin_lock(&all_mddevs_lock);
4945 tmp = all_mddevs.next;
4947 tmp = mddev->all_mddevs.next;
4948 if (tmp != &all_mddevs)
4949 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4951 next_mddev = (void*)2;
4954 spin_unlock(&all_mddevs_lock);
4962 static void md_seq_stop(struct seq_file *seq, void *v)
4966 if (mddev && v != (void*)1 && v != (void*)2)
4970 struct mdstat_info {
4974 static int md_seq_show(struct seq_file *seq, void *v)
4978 struct list_head *tmp2;
4980 struct mdstat_info *mi = seq->private;
4981 struct bitmap *bitmap;
4983 if (v == (void*)1) {
4984 struct mdk_personality *pers;
4985 seq_printf(seq, "Personalities : ");
4986 spin_lock(&pers_lock);
4987 list_for_each_entry(pers, &pers_list, list)
4988 seq_printf(seq, "[%s] ", pers->name);
4990 spin_unlock(&pers_lock);
4991 seq_printf(seq, "\n");
4992 mi->event = atomic_read(&md_event_count);
4995 if (v == (void*)2) {
5000 if (mddev_lock(mddev) < 0)
5003 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5004 seq_printf(seq, "%s : %sactive", mdname(mddev),
5005 mddev->pers ? "" : "in");
5008 seq_printf(seq, " (read-only)");
5010 seq_printf(seq, "(auto-read-only)");
5011 seq_printf(seq, " %s", mddev->pers->name);
5015 ITERATE_RDEV(mddev,rdev,tmp2) {
5016 char b[BDEVNAME_SIZE];
5017 seq_printf(seq, " %s[%d]",
5018 bdevname(rdev->bdev,b), rdev->desc_nr);
5019 if (test_bit(WriteMostly, &rdev->flags))
5020 seq_printf(seq, "(W)");
5021 if (test_bit(Faulty, &rdev->flags)) {
5022 seq_printf(seq, "(F)");
5024 } else if (rdev->raid_disk < 0)
5025 seq_printf(seq, "(S)"); /* spare */
5029 if (!list_empty(&mddev->disks)) {
5031 seq_printf(seq, "\n %llu blocks",
5032 (unsigned long long)mddev->array_size);
5034 seq_printf(seq, "\n %llu blocks",
5035 (unsigned long long)size);
5037 if (mddev->persistent) {
5038 if (mddev->major_version != 0 ||
5039 mddev->minor_version != 90) {
5040 seq_printf(seq," super %d.%d",
5041 mddev->major_version,
5042 mddev->minor_version);
5044 } else if (mddev->external)
5045 seq_printf(seq, " super external:%s",
5046 mddev->metadata_type);
5048 seq_printf(seq, " super non-persistent");
5051 mddev->pers->status (seq, mddev);
5052 seq_printf(seq, "\n ");
5053 if (mddev->pers->sync_request) {
5054 if (mddev->curr_resync > 2) {
5055 status_resync (seq, mddev);
5056 seq_printf(seq, "\n ");
5057 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5058 seq_printf(seq, "\tresync=DELAYED\n ");
5059 else if (mddev->recovery_cp < MaxSector)
5060 seq_printf(seq, "\tresync=PENDING\n ");
5063 seq_printf(seq, "\n ");
5065 if ((bitmap = mddev->bitmap)) {
5066 unsigned long chunk_kb;
5067 unsigned long flags;
5068 spin_lock_irqsave(&bitmap->lock, flags);
5069 chunk_kb = bitmap->chunksize >> 10;
5070 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5072 bitmap->pages - bitmap->missing_pages,
5074 (bitmap->pages - bitmap->missing_pages)
5075 << (PAGE_SHIFT - 10),
5076 chunk_kb ? chunk_kb : bitmap->chunksize,
5077 chunk_kb ? "KB" : "B");
5079 seq_printf(seq, ", file: ");
5080 seq_path(seq, bitmap->file->f_path.mnt,
5081 bitmap->file->f_path.dentry," \t\n");
5084 seq_printf(seq, "\n");
5085 spin_unlock_irqrestore(&bitmap->lock, flags);
5088 seq_printf(seq, "\n");
5090 mddev_unlock(mddev);
5095 static struct seq_operations md_seq_ops = {
5096 .start = md_seq_start,
5097 .next = md_seq_next,
5098 .stop = md_seq_stop,
5099 .show = md_seq_show,
5102 static int md_seq_open(struct inode *inode, struct file *file)
5105 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5109 error = seq_open(file, &md_seq_ops);
5113 struct seq_file *p = file->private_data;
5115 mi->event = atomic_read(&md_event_count);
5120 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5122 struct seq_file *m = filp->private_data;
5123 struct mdstat_info *mi = m->private;
5126 poll_wait(filp, &md_event_waiters, wait);
5128 /* always allow read */
5129 mask = POLLIN | POLLRDNORM;
5131 if (mi->event != atomic_read(&md_event_count))
5132 mask |= POLLERR | POLLPRI;
5136 static const struct file_operations md_seq_fops = {
5137 .owner = THIS_MODULE,
5138 .open = md_seq_open,
5140 .llseek = seq_lseek,
5141 .release = seq_release_private,
5142 .poll = mdstat_poll,
5145 int register_md_personality(struct mdk_personality *p)
5147 spin_lock(&pers_lock);
5148 list_add_tail(&p->list, &pers_list);
5149 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5150 spin_unlock(&pers_lock);
5154 int unregister_md_personality(struct mdk_personality *p)
5156 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5157 spin_lock(&pers_lock);
5158 list_del_init(&p->list);
5159 spin_unlock(&pers_lock);
5163 static int is_mddev_idle(mddev_t *mddev)
5166 struct list_head *tmp;
5171 ITERATE_RDEV(mddev,rdev,tmp) {
5172 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5173 curr_events = disk_stat_read(disk, sectors[0]) +
5174 disk_stat_read(disk, sectors[1]) -
5175 atomic_read(&disk->sync_io);
5176 /* sync IO will cause sync_io to increase before the disk_stats
5177 * as sync_io is counted when a request starts, and
5178 * disk_stats is counted when it completes.
5179 * So resync activity will cause curr_events to be smaller than
5180 * when there was no such activity.
5181 * non-sync IO will cause disk_stat to increase without
5182 * increasing sync_io so curr_events will (eventually)
5183 * be larger than it was before. Once it becomes
5184 * substantially larger, the test below will cause
5185 * the array to appear non-idle, and resync will slow
5187 * If there is a lot of outstanding resync activity when
5188 * we set last_event to curr_events, then all that activity
5189 * completing might cause the array to appear non-idle
5190 * and resync will be slowed down even though there might
5191 * not have been non-resync activity. This will only
5192 * happen once though. 'last_events' will soon reflect
5193 * the state where there is little or no outstanding
5194 * resync requests, and further resync activity will
5195 * always make curr_events less than last_events.
5198 if (curr_events - rdev->last_events > 4096) {
5199 rdev->last_events = curr_events;
5206 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5208 /* another "blocks" (512byte) blocks have been synced */
5209 atomic_sub(blocks, &mddev->recovery_active);
5210 wake_up(&mddev->recovery_wait);
5212 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5213 md_wakeup_thread(mddev->thread);
5214 // stop recovery, signal do_sync ....
5219 /* md_write_start(mddev, bi)
5220 * If we need to update some array metadata (e.g. 'active' flag
5221 * in superblock) before writing, schedule a superblock update
5222 * and wait for it to complete.
5224 void md_write_start(mddev_t *mddev, struct bio *bi)
5226 if (bio_data_dir(bi) != WRITE)
5229 BUG_ON(mddev->ro == 1);
5230 if (mddev->ro == 2) {
5231 /* need to switch to read/write */
5233 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5234 md_wakeup_thread(mddev->thread);
5236 atomic_inc(&mddev->writes_pending);
5237 if (mddev->in_sync) {
5238 spin_lock_irq(&mddev->write_lock);
5239 if (mddev->in_sync) {
5241 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5242 md_wakeup_thread(mddev->thread);
5244 spin_unlock_irq(&mddev->write_lock);
5246 wait_event(mddev->sb_wait, mddev->flags==0);
5249 void md_write_end(mddev_t *mddev)
5251 if (atomic_dec_and_test(&mddev->writes_pending)) {
5252 if (mddev->safemode == 2)
5253 md_wakeup_thread(mddev->thread);
5254 else if (mddev->safemode_delay)
5255 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5259 /* md_allow_write(mddev)
5260 * Calling this ensures that the array is marked 'active' so that writes
5261 * may proceed without blocking. It is important to call this before
5262 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5263 * Must be called with mddev_lock held.
5265 void md_allow_write(mddev_t *mddev)
5272 spin_lock_irq(&mddev->write_lock);
5273 if (mddev->in_sync) {
5275 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5276 if (mddev->safemode_delay &&
5277 mddev->safemode == 0)
5278 mddev->safemode = 1;
5279 spin_unlock_irq(&mddev->write_lock);
5280 md_update_sb(mddev, 0);
5282 spin_unlock_irq(&mddev->write_lock);
5284 EXPORT_SYMBOL_GPL(md_allow_write);
5286 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
5288 #define SYNC_MARKS 10
5289 #define SYNC_MARK_STEP (3*HZ)
5290 void md_do_sync(mddev_t *mddev)
5293 unsigned int currspeed = 0,
5295 sector_t max_sectors,j, io_sectors;
5296 unsigned long mark[SYNC_MARKS];
5297 sector_t mark_cnt[SYNC_MARKS];
5299 struct list_head *tmp;
5300 sector_t last_check;
5302 struct list_head *rtmp;
5306 /* just incase thread restarts... */
5307 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5309 if (mddev->ro) /* never try to sync a read-only array */
5312 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5313 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5314 desc = "data-check";
5315 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5316 desc = "requested-resync";
5319 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5324 /* we overload curr_resync somewhat here.
5325 * 0 == not engaged in resync at all
5326 * 2 == checking that there is no conflict with another sync
5327 * 1 == like 2, but have yielded to allow conflicting resync to
5329 * other == active in resync - this many blocks
5331 * Before starting a resync we must have set curr_resync to
5332 * 2, and then checked that every "conflicting" array has curr_resync
5333 * less than ours. When we find one that is the same or higher
5334 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5335 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5336 * This will mean we have to start checking from the beginning again.
5341 mddev->curr_resync = 2;
5344 if (kthread_should_stop()) {
5345 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5348 ITERATE_MDDEV(mddev2,tmp) {
5349 if (mddev2 == mddev)
5351 if (mddev2->curr_resync &&
5352 match_mddev_units(mddev,mddev2)) {
5354 if (mddev < mddev2 && mddev->curr_resync == 2) {
5355 /* arbitrarily yield */
5356 mddev->curr_resync = 1;
5357 wake_up(&resync_wait);
5359 if (mddev > mddev2 && mddev->curr_resync == 1)
5360 /* no need to wait here, we can wait the next
5361 * time 'round when curr_resync == 2
5364 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
5365 if (!kthread_should_stop() &&
5366 mddev2->curr_resync >= mddev->curr_resync) {
5367 printk(KERN_INFO "md: delaying %s of %s"
5368 " until %s has finished (they"
5369 " share one or more physical units)\n",
5370 desc, mdname(mddev), mdname(mddev2));
5373 finish_wait(&resync_wait, &wq);
5376 finish_wait(&resync_wait, &wq);
5379 } while (mddev->curr_resync < 2);
5382 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5383 /* resync follows the size requested by the personality,
5384 * which defaults to physical size, but can be virtual size
5386 max_sectors = mddev->resync_max_sectors;
5387 mddev->resync_mismatches = 0;
5388 /* we don't use the checkpoint if there's a bitmap */
5389 if (!mddev->bitmap &&
5390 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5391 j = mddev->recovery_cp;
5392 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5393 max_sectors = mddev->size << 1;
5395 /* recovery follows the physical size of devices */
5396 max_sectors = mddev->size << 1;
5398 ITERATE_RDEV(mddev,rdev,rtmp)
5399 if (rdev->raid_disk >= 0 &&
5400 !test_bit(Faulty, &rdev->flags) &&
5401 !test_bit(In_sync, &rdev->flags) &&
5402 rdev->recovery_offset < j)
5403 j = rdev->recovery_offset;
5406 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5407 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5408 " %d KB/sec/disk.\n", speed_min(mddev));
5409 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5410 "(but not more than %d KB/sec) for %s.\n",
5411 speed_max(mddev), desc);
5413 is_mddev_idle(mddev); /* this also initializes IO event counters */
5416 for (m = 0; m < SYNC_MARKS; m++) {
5418 mark_cnt[m] = io_sectors;
5421 mddev->resync_mark = mark[last_mark];
5422 mddev->resync_mark_cnt = mark_cnt[last_mark];
5425 * Tune reconstruction:
5427 window = 32*(PAGE_SIZE/512);
5428 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5429 window/2,(unsigned long long) max_sectors/2);
5431 atomic_set(&mddev->recovery_active, 0);
5432 init_waitqueue_head(&mddev->recovery_wait);
5437 "md: resuming %s of %s from checkpoint.\n",
5438 desc, mdname(mddev));
5439 mddev->curr_resync = j;
5442 while (j < max_sectors) {
5446 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5447 currspeed < speed_min(mddev));
5449 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
5453 if (!skipped) { /* actual IO requested */
5454 io_sectors += sectors;
5455 atomic_add(sectors, &mddev->recovery_active);
5459 if (j>1) mddev->curr_resync = j;
5460 mddev->curr_mark_cnt = io_sectors;
5461 if (last_check == 0)
5462 /* this is the earliers that rebuilt will be
5463 * visible in /proc/mdstat
5465 md_new_event(mddev);
5467 if (last_check + window > io_sectors || j == max_sectors)
5470 last_check = io_sectors;
5472 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
5473 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
5477 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5479 int next = (last_mark+1) % SYNC_MARKS;
5481 mddev->resync_mark = mark[next];
5482 mddev->resync_mark_cnt = mark_cnt[next];
5483 mark[next] = jiffies;
5484 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5489 if (kthread_should_stop()) {
5491 * got a signal, exit.
5494 "md: md_do_sync() got signal ... exiting\n");
5495 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5500 * this loop exits only if either when we are slower than
5501 * the 'hard' speed limit, or the system was IO-idle for
5503 * the system might be non-idle CPU-wise, but we only care
5504 * about not overloading the IO subsystem. (things like an
5505 * e2fsck being done on the RAID array should execute fast)
5507 blk_unplug(mddev->queue);
5510 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5511 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5513 if (currspeed > speed_min(mddev)) {
5514 if ((currspeed > speed_max(mddev)) ||
5515 !is_mddev_idle(mddev)) {
5521 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5523 * this also signals 'finished resyncing' to md_stop
5526 blk_unplug(mddev->queue);
5528 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5530 /* tell personality that we are finished */
5531 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5533 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5534 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5535 mddev->curr_resync > 2) {
5536 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5537 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5538 if (mddev->curr_resync >= mddev->recovery_cp) {
5540 "md: checkpointing %s of %s.\n",
5541 desc, mdname(mddev));
5542 mddev->recovery_cp = mddev->curr_resync;
5545 mddev->recovery_cp = MaxSector;
5547 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5548 mddev->curr_resync = MaxSector;
5549 ITERATE_RDEV(mddev,rdev,rtmp)
5550 if (rdev->raid_disk >= 0 &&
5551 !test_bit(Faulty, &rdev->flags) &&
5552 !test_bit(In_sync, &rdev->flags) &&
5553 rdev->recovery_offset < mddev->curr_resync)
5554 rdev->recovery_offset = mddev->curr_resync;
5557 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5560 mddev->curr_resync = 0;
5561 wake_up(&resync_wait);
5562 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5563 md_wakeup_thread(mddev->thread);
5565 EXPORT_SYMBOL_GPL(md_do_sync);
5568 static int remove_and_add_spares(mddev_t *mddev)
5571 struct list_head *rtmp;
5574 ITERATE_RDEV(mddev,rdev,rtmp)
5575 if (rdev->raid_disk >= 0 &&
5577 (test_bit(Faulty, &rdev->flags) ||
5578 ! test_bit(In_sync, &rdev->flags)) &&
5579 atomic_read(&rdev->nr_pending)==0) {
5580 if (mddev->pers->hot_remove_disk(
5581 mddev, rdev->raid_disk)==0) {
5583 sprintf(nm,"rd%d", rdev->raid_disk);
5584 sysfs_remove_link(&mddev->kobj, nm);
5585 rdev->raid_disk = -1;
5589 if (mddev->degraded) {
5590 ITERATE_RDEV(mddev,rdev,rtmp)
5591 if (rdev->raid_disk < 0
5592 && !test_bit(Faulty, &rdev->flags)) {
5593 rdev->recovery_offset = 0;
5594 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5596 sprintf(nm, "rd%d", rdev->raid_disk);
5597 if (sysfs_create_link(&mddev->kobj,
5600 "md: cannot register "
5604 md_new_event(mddev);
5612 * This routine is regularly called by all per-raid-array threads to
5613 * deal with generic issues like resync and super-block update.
5614 * Raid personalities that don't have a thread (linear/raid0) do not
5615 * need this as they never do any recovery or update the superblock.
5617 * It does not do any resync itself, but rather "forks" off other threads
5618 * to do that as needed.
5619 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5620 * "->recovery" and create a thread at ->sync_thread.
5621 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5622 * and wakeups up this thread which will reap the thread and finish up.
5623 * This thread also removes any faulty devices (with nr_pending == 0).
5625 * The overall approach is:
5626 * 1/ if the superblock needs updating, update it.
5627 * 2/ If a recovery thread is running, don't do anything else.
5628 * 3/ If recovery has finished, clean up, possibly marking spares active.
5629 * 4/ If there are any faulty devices, remove them.
5630 * 5/ If array is degraded, try to add spares devices
5631 * 6/ If array has spares or is not in-sync, start a resync thread.
5633 void md_check_recovery(mddev_t *mddev)
5636 struct list_head *rtmp;
5640 bitmap_daemon_work(mddev->bitmap);
5645 if (signal_pending(current)) {
5646 if (mddev->pers->sync_request) {
5647 printk(KERN_INFO "md: %s in immediate safe mode\n",
5649 mddev->safemode = 2;
5651 flush_signals(current);
5655 (mddev->flags && !mddev->external) ||
5656 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
5657 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5658 (mddev->safemode == 1) ||
5659 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5660 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
5664 if (mddev_trylock(mddev)) {
5667 spin_lock_irq(&mddev->write_lock);
5668 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5669 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5671 if (mddev->persistent)
5672 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5674 if (mddev->safemode == 1)
5675 mddev->safemode = 0;
5676 spin_unlock_irq(&mddev->write_lock);
5679 md_update_sb(mddev, 0);
5682 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5683 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5684 /* resync/recovery still happening */
5685 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5688 if (mddev->sync_thread) {
5689 /* resync has finished, collect result */
5690 md_unregister_thread(mddev->sync_thread);
5691 mddev->sync_thread = NULL;
5692 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5693 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5695 /* activate any spares */
5696 mddev->pers->spare_active(mddev);
5698 md_update_sb(mddev, 1);
5700 /* if array is no-longer degraded, then any saved_raid_disk
5701 * information must be scrapped
5703 if (!mddev->degraded)
5704 ITERATE_RDEV(mddev,rdev,rtmp)
5705 rdev->saved_raid_disk = -1;
5707 mddev->recovery = 0;
5708 /* flag recovery needed just to double check */
5709 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5710 md_new_event(mddev);
5713 /* Clear some bits that don't mean anything, but
5716 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5717 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5718 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5719 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
5721 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5723 /* no recovery is running.
5724 * remove any failed drives, then
5725 * add spares if possible.
5726 * Spare are also removed and re-added, to allow
5727 * the personality to fail the re-add.
5730 if (mddev->reshape_position != MaxSector) {
5731 if (mddev->pers->check_reshape(mddev) != 0)
5732 /* Cannot proceed */
5734 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
5735 } else if ((spares = remove_and_add_spares(mddev))) {
5736 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5737 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5738 } else if (mddev->recovery_cp < MaxSector) {
5739 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5740 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5741 /* nothing to be done ... */
5744 if (mddev->pers->sync_request) {
5745 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
5746 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5747 /* We are adding a device or devices to an array
5748 * which has the bitmap stored on all devices.
5749 * So make sure all bitmap pages get written
5751 bitmap_write_all(mddev->bitmap);
5753 mddev->sync_thread = md_register_thread(md_do_sync,
5756 if (!mddev->sync_thread) {
5757 printk(KERN_ERR "%s: could not start resync"
5760 /* leave the spares where they are, it shouldn't hurt */
5761 mddev->recovery = 0;
5763 md_wakeup_thread(mddev->sync_thread);
5764 md_new_event(mddev);
5767 mddev_unlock(mddev);
5771 static int md_notify_reboot(struct notifier_block *this,
5772 unsigned long code, void *x)
5774 struct list_head *tmp;
5777 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5779 printk(KERN_INFO "md: stopping all md devices.\n");
5781 ITERATE_MDDEV(mddev,tmp)
5782 if (mddev_trylock(mddev)) {
5783 do_md_stop (mddev, 1);
5784 mddev_unlock(mddev);
5787 * certain more exotic SCSI devices are known to be
5788 * volatile wrt too early system reboots. While the
5789 * right place to handle this issue is the given
5790 * driver, we do want to have a safe RAID driver ...
5797 static struct notifier_block md_notifier = {
5798 .notifier_call = md_notify_reboot,
5800 .priority = INT_MAX, /* before any real devices */
5803 static void md_geninit(void)
5805 struct proc_dir_entry *p;
5807 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5809 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5811 p->proc_fops = &md_seq_fops;
5814 static int __init md_init(void)
5816 if (register_blkdev(MAJOR_NR, "md"))
5818 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5819 unregister_blkdev(MAJOR_NR, "md");
5822 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
5823 md_probe, NULL, NULL);
5824 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
5825 md_probe, NULL, NULL);
5827 register_reboot_notifier(&md_notifier);
5828 raid_table_header = register_sysctl_table(raid_root_table);
5838 * Searches all registered partitions for autorun RAID arrays
5842 static LIST_HEAD(all_detected_devices);
5843 struct detected_devices_node {
5844 struct list_head list;
5848 void md_autodetect_dev(dev_t dev)
5850 struct detected_devices_node *node_detected_dev;
5852 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
5853 if (node_detected_dev) {
5854 node_detected_dev->dev = dev;
5855 list_add_tail(&node_detected_dev->list, &all_detected_devices);
5857 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
5858 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
5863 static void autostart_arrays(int part)
5866 struct detected_devices_node *node_detected_dev;
5868 int i_scanned, i_passed;
5873 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5875 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
5877 node_detected_dev = list_entry(all_detected_devices.next,
5878 struct detected_devices_node, list);
5879 list_del(&node_detected_dev->list);
5880 dev = node_detected_dev->dev;
5881 kfree(node_detected_dev);
5882 rdev = md_import_device(dev,0, 90);
5886 if (test_bit(Faulty, &rdev->flags)) {
5890 list_add(&rdev->same_set, &pending_raid_disks);
5894 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
5895 i_scanned, i_passed);
5897 autorun_devices(part);
5900 #endif /* !MODULE */
5902 static __exit void md_exit(void)
5905 struct list_head *tmp;
5907 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
5908 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
5910 unregister_blkdev(MAJOR_NR,"md");
5911 unregister_blkdev(mdp_major, "mdp");
5912 unregister_reboot_notifier(&md_notifier);
5913 unregister_sysctl_table(raid_table_header);
5914 remove_proc_entry("mdstat", NULL);
5915 ITERATE_MDDEV(mddev,tmp) {
5916 struct gendisk *disk = mddev->gendisk;
5919 export_array(mddev);
5922 mddev->gendisk = NULL;
5927 subsys_initcall(md_init);
5928 module_exit(md_exit)
5930 static int get_ro(char *buffer, struct kernel_param *kp)
5932 return sprintf(buffer, "%d", start_readonly);
5934 static int set_ro(const char *val, struct kernel_param *kp)
5937 int num = simple_strtoul(val, &e, 10);
5938 if (*val && (*e == '\0' || *e == '\n')) {
5939 start_readonly = num;
5945 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
5946 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
5949 EXPORT_SYMBOL(register_md_personality);
5950 EXPORT_SYMBOL(unregister_md_personality);
5951 EXPORT_SYMBOL(md_error);
5952 EXPORT_SYMBOL(md_done_sync);
5953 EXPORT_SYMBOL(md_write_start);
5954 EXPORT_SYMBOL(md_write_end);
5955 EXPORT_SYMBOL(md_register_thread);
5956 EXPORT_SYMBOL(md_unregister_thread);
5957 EXPORT_SYMBOL(md_wakeup_thread);
5958 EXPORT_SYMBOL(md_check_recovery);
5959 MODULE_LICENSE("GPL");
5961 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);