2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/raid/md.h>
37 #include <linux/raid/bitmap.h>
38 #include <linux/sysctl.h>
39 #include <linux/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/delay.h>
49 #define MAJOR_NR MD_MAJOR
51 /* 63 partitions with the alternate major number (mdp) */
52 #define MdpMinorShift 6
55 #define dprintk(x...) ((void)(DEBUG && printk(x)))
59 static void autostart_arrays(int part);
62 static LIST_HEAD(pers_list);
63 static DEFINE_SPINLOCK(pers_lock);
65 static void md_print_devices(void);
67 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
69 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
72 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
73 * is 1000 KB/sec, so the extra system load does not show up that much.
74 * Increase it if you want to have more _guaranteed_ speed. Note that
75 * the RAID driver will use the maximum available bandwidth if the IO
76 * subsystem is idle. There is also an 'absolute maximum' reconstruction
77 * speed limit - in case reconstruction slows down your system despite
80 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
81 * or /sys/block/mdX/md/sync_speed_{min,max}
84 static int sysctl_speed_limit_min = 1000;
85 static int sysctl_speed_limit_max = 200000;
86 static inline int speed_min(mddev_t *mddev)
88 return mddev->sync_speed_min ?
89 mddev->sync_speed_min : sysctl_speed_limit_min;
92 static inline int speed_max(mddev_t *mddev)
94 return mddev->sync_speed_max ?
95 mddev->sync_speed_max : sysctl_speed_limit_max;
98 static struct ctl_table_header *raid_table_header;
100 static ctl_table raid_table[] = {
102 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
103 .procname = "speed_limit_min",
104 .data = &sysctl_speed_limit_min,
105 .maxlen = sizeof(int),
106 .mode = S_IRUGO|S_IWUSR,
107 .proc_handler = &proc_dointvec,
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
111 .procname = "speed_limit_max",
112 .data = &sysctl_speed_limit_max,
113 .maxlen = sizeof(int),
114 .mode = S_IRUGO|S_IWUSR,
115 .proc_handler = &proc_dointvec,
120 static ctl_table raid_dir_table[] = {
122 .ctl_name = DEV_RAID,
125 .mode = S_IRUGO|S_IXUGO,
131 static ctl_table raid_root_table[] = {
137 .child = raid_dir_table,
142 static struct block_device_operations md_fops;
144 static int start_readonly;
147 * We have a system wide 'event count' that is incremented
148 * on any 'interesting' event, and readers of /proc/mdstat
149 * can use 'poll' or 'select' to find out when the event
153 * start array, stop array, error, add device, remove device,
154 * start build, activate spare
156 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
157 static atomic_t md_event_count;
158 void md_new_event(mddev_t *mddev)
160 atomic_inc(&md_event_count);
161 wake_up(&md_event_waiters);
163 EXPORT_SYMBOL_GPL(md_new_event);
165 /* Alternate version that can be called from interrupts
166 * when calling sysfs_notify isn't needed.
168 static void md_new_event_inintr(mddev_t *mddev)
170 atomic_inc(&md_event_count);
171 wake_up(&md_event_waiters);
175 * Enables to iterate over all existing md arrays
176 * all_mddevs_lock protects this list.
178 static LIST_HEAD(all_mddevs);
179 static DEFINE_SPINLOCK(all_mddevs_lock);
183 * iterates through all used mddevs in the system.
184 * We take care to grab the all_mddevs_lock whenever navigating
185 * the list, and to always hold a refcount when unlocked.
186 * Any code which breaks out of this loop while own
187 * a reference to the current mddev and must mddev_put it.
189 #define for_each_mddev(mddev,tmp) \
191 for (({ spin_lock(&all_mddevs_lock); \
192 tmp = all_mddevs.next; \
194 ({ if (tmp != &all_mddevs) \
195 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
196 spin_unlock(&all_mddevs_lock); \
197 if (mddev) mddev_put(mddev); \
198 mddev = list_entry(tmp, mddev_t, all_mddevs); \
199 tmp != &all_mddevs;}); \
200 ({ spin_lock(&all_mddevs_lock); \
205 static int md_fail_request(struct request_queue *q, struct bio *bio)
211 static inline mddev_t *mddev_get(mddev_t *mddev)
213 atomic_inc(&mddev->active);
217 static void mddev_put(mddev_t *mddev)
219 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
221 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
222 list_del(&mddev->all_mddevs);
223 spin_unlock(&all_mddevs_lock);
224 blk_cleanup_queue(mddev->queue);
225 kobject_put(&mddev->kobj);
227 spin_unlock(&all_mddevs_lock);
230 static mddev_t * mddev_find(dev_t unit)
232 mddev_t *mddev, *new = NULL;
235 spin_lock(&all_mddevs_lock);
236 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
237 if (mddev->unit == unit) {
239 spin_unlock(&all_mddevs_lock);
245 list_add(&new->all_mddevs, &all_mddevs);
246 spin_unlock(&all_mddevs_lock);
249 spin_unlock(&all_mddevs_lock);
251 new = kzalloc(sizeof(*new), GFP_KERNEL);
256 if (MAJOR(unit) == MD_MAJOR)
257 new->md_minor = MINOR(unit);
259 new->md_minor = MINOR(unit) >> MdpMinorShift;
261 mutex_init(&new->reconfig_mutex);
262 INIT_LIST_HEAD(&new->disks);
263 INIT_LIST_HEAD(&new->all_mddevs);
264 init_timer(&new->safemode_timer);
265 atomic_set(&new->active, 1);
266 atomic_set(&new->openers, 0);
267 spin_lock_init(&new->write_lock);
268 init_waitqueue_head(&new->sb_wait);
269 init_waitqueue_head(&new->recovery_wait);
270 new->reshape_position = MaxSector;
272 new->resync_max = MaxSector;
273 new->level = LEVEL_NONE;
275 new->queue = blk_alloc_queue(GFP_KERNEL);
280 /* Can be unlocked because the queue is new: no concurrency */
281 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue);
283 blk_queue_make_request(new->queue, md_fail_request);
288 static inline int mddev_lock(mddev_t * mddev)
290 return mutex_lock_interruptible(&mddev->reconfig_mutex);
293 static inline int mddev_trylock(mddev_t * mddev)
295 return mutex_trylock(&mddev->reconfig_mutex);
298 static inline void mddev_unlock(mddev_t * mddev)
300 mutex_unlock(&mddev->reconfig_mutex);
302 md_wakeup_thread(mddev->thread);
305 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
308 struct list_head *tmp;
310 rdev_for_each(rdev, tmp, mddev) {
311 if (rdev->desc_nr == nr)
317 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
319 struct list_head *tmp;
322 rdev_for_each(rdev, tmp, mddev) {
323 if (rdev->bdev->bd_dev == dev)
329 static struct mdk_personality *find_pers(int level, char *clevel)
331 struct mdk_personality *pers;
332 list_for_each_entry(pers, &pers_list, list) {
333 if (level != LEVEL_NONE && pers->level == level)
335 if (strcmp(pers->name, clevel)==0)
341 /* return the offset of the super block in 512byte sectors */
342 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
344 sector_t num_sectors = bdev->bd_inode->i_size / 512;
345 return MD_NEW_SIZE_SECTORS(num_sectors);
348 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
350 sector_t num_sectors = rdev->sb_start;
353 num_sectors &= ~((sector_t)chunk_size/512 - 1);
357 static int alloc_disk_sb(mdk_rdev_t * rdev)
362 rdev->sb_page = alloc_page(GFP_KERNEL);
363 if (!rdev->sb_page) {
364 printk(KERN_ALERT "md: out of memory.\n");
371 static void free_disk_sb(mdk_rdev_t * rdev)
374 put_page(rdev->sb_page);
376 rdev->sb_page = NULL;
383 static void super_written(struct bio *bio, int error)
385 mdk_rdev_t *rdev = bio->bi_private;
386 mddev_t *mddev = rdev->mddev;
388 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
389 printk("md: super_written gets error=%d, uptodate=%d\n",
390 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
391 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
392 md_error(mddev, rdev);
395 if (atomic_dec_and_test(&mddev->pending_writes))
396 wake_up(&mddev->sb_wait);
400 static void super_written_barrier(struct bio *bio, int error)
402 struct bio *bio2 = bio->bi_private;
403 mdk_rdev_t *rdev = bio2->bi_private;
404 mddev_t *mddev = rdev->mddev;
406 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
407 error == -EOPNOTSUPP) {
409 /* barriers don't appear to be supported :-( */
410 set_bit(BarriersNotsupp, &rdev->flags);
411 mddev->barriers_work = 0;
412 spin_lock_irqsave(&mddev->write_lock, flags);
413 bio2->bi_next = mddev->biolist;
414 mddev->biolist = bio2;
415 spin_unlock_irqrestore(&mddev->write_lock, flags);
416 wake_up(&mddev->sb_wait);
420 bio->bi_private = rdev;
421 super_written(bio, error);
425 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
426 sector_t sector, int size, struct page *page)
428 /* write first size bytes of page to sector of rdev
429 * Increment mddev->pending_writes before returning
430 * and decrement it on completion, waking up sb_wait
431 * if zero is reached.
432 * If an error occurred, call md_error
434 * As we might need to resubmit the request if BIO_RW_BARRIER
435 * causes ENOTSUPP, we allocate a spare bio...
437 struct bio *bio = bio_alloc(GFP_NOIO, 1);
438 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
440 bio->bi_bdev = rdev->bdev;
441 bio->bi_sector = sector;
442 bio_add_page(bio, page, size, 0);
443 bio->bi_private = rdev;
444 bio->bi_end_io = super_written;
447 atomic_inc(&mddev->pending_writes);
448 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
450 rw |= (1<<BIO_RW_BARRIER);
451 rbio = bio_clone(bio, GFP_NOIO);
452 rbio->bi_private = bio;
453 rbio->bi_end_io = super_written_barrier;
454 submit_bio(rw, rbio);
459 void md_super_wait(mddev_t *mddev)
461 /* wait for all superblock writes that were scheduled to complete.
462 * if any had to be retried (due to BARRIER problems), retry them
466 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
467 if (atomic_read(&mddev->pending_writes)==0)
469 while (mddev->biolist) {
471 spin_lock_irq(&mddev->write_lock);
472 bio = mddev->biolist;
473 mddev->biolist = bio->bi_next ;
475 spin_unlock_irq(&mddev->write_lock);
476 submit_bio(bio->bi_rw, bio);
480 finish_wait(&mddev->sb_wait, &wq);
483 static void bi_complete(struct bio *bio, int error)
485 complete((struct completion*)bio->bi_private);
488 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
489 struct page *page, int rw)
491 struct bio *bio = bio_alloc(GFP_NOIO, 1);
492 struct completion event;
495 rw |= (1 << BIO_RW_SYNC);
498 bio->bi_sector = sector;
499 bio_add_page(bio, page, size, 0);
500 init_completion(&event);
501 bio->bi_private = &event;
502 bio->bi_end_io = bi_complete;
504 wait_for_completion(&event);
506 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
510 EXPORT_SYMBOL_GPL(sync_page_io);
512 static int read_disk_sb(mdk_rdev_t * rdev, int size)
514 char b[BDEVNAME_SIZE];
515 if (!rdev->sb_page) {
523 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
529 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
530 bdevname(rdev->bdev,b));
534 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
536 return sb1->set_uuid0 == sb2->set_uuid0 &&
537 sb1->set_uuid1 == sb2->set_uuid1 &&
538 sb1->set_uuid2 == sb2->set_uuid2 &&
539 sb1->set_uuid3 == sb2->set_uuid3;
542 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
545 mdp_super_t *tmp1, *tmp2;
547 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
548 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
550 if (!tmp1 || !tmp2) {
552 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
560 * nr_disks is not constant
565 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
573 static u32 md_csum_fold(u32 csum)
575 csum = (csum & 0xffff) + (csum >> 16);
576 return (csum & 0xffff) + (csum >> 16);
579 static unsigned int calc_sb_csum(mdp_super_t * sb)
582 u32 *sb32 = (u32*)sb;
584 unsigned int disk_csum, csum;
586 disk_csum = sb->sb_csum;
589 for (i = 0; i < MD_SB_BYTES/4 ; i++)
591 csum = (newcsum & 0xffffffff) + (newcsum>>32);
595 /* This used to use csum_partial, which was wrong for several
596 * reasons including that different results are returned on
597 * different architectures. It isn't critical that we get exactly
598 * the same return value as before (we always csum_fold before
599 * testing, and that removes any differences). However as we
600 * know that csum_partial always returned a 16bit value on
601 * alphas, do a fold to maximise conformity to previous behaviour.
603 sb->sb_csum = md_csum_fold(disk_csum);
605 sb->sb_csum = disk_csum;
612 * Handle superblock details.
613 * We want to be able to handle multiple superblock formats
614 * so we have a common interface to them all, and an array of
615 * different handlers.
616 * We rely on user-space to write the initial superblock, and support
617 * reading and updating of superblocks.
618 * Interface methods are:
619 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
620 * loads and validates a superblock on dev.
621 * if refdev != NULL, compare superblocks on both devices
623 * 0 - dev has a superblock that is compatible with refdev
624 * 1 - dev has a superblock that is compatible and newer than refdev
625 * so dev should be used as the refdev in future
626 * -EINVAL superblock incompatible or invalid
627 * -othererror e.g. -EIO
629 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
630 * Verify that dev is acceptable into mddev.
631 * The first time, mddev->raid_disks will be 0, and data from
632 * dev should be merged in. Subsequent calls check that dev
633 * is new enough. Return 0 or -EINVAL
635 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
636 * Update the superblock for rdev with data in mddev
637 * This does not write to disc.
643 struct module *owner;
644 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
646 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
647 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
648 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
649 sector_t num_sectors);
653 * load_super for 0.90.0
655 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
657 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
662 * Calculate the position of the superblock (512byte sectors),
663 * it's at the end of the disk.
665 * It also happens to be a multiple of 4Kb.
667 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
669 ret = read_disk_sb(rdev, MD_SB_BYTES);
674 bdevname(rdev->bdev, b);
675 sb = (mdp_super_t*)page_address(rdev->sb_page);
677 if (sb->md_magic != MD_SB_MAGIC) {
678 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
683 if (sb->major_version != 0 ||
684 sb->minor_version < 90 ||
685 sb->minor_version > 91) {
686 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
687 sb->major_version, sb->minor_version,
692 if (sb->raid_disks <= 0)
695 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
696 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
701 rdev->preferred_minor = sb->md_minor;
702 rdev->data_offset = 0;
703 rdev->sb_size = MD_SB_BYTES;
705 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
706 if (sb->level != 1 && sb->level != 4
707 && sb->level != 5 && sb->level != 6
708 && sb->level != 10) {
709 /* FIXME use a better test */
711 "md: bitmaps not supported for this level.\n");
716 if (sb->level == LEVEL_MULTIPATH)
719 rdev->desc_nr = sb->this_disk.number;
725 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
726 if (!uuid_equal(refsb, sb)) {
727 printk(KERN_WARNING "md: %s has different UUID to %s\n",
728 b, bdevname(refdev->bdev,b2));
731 if (!sb_equal(refsb, sb)) {
732 printk(KERN_WARNING "md: %s has same UUID"
733 " but different superblock to %s\n",
734 b, bdevname(refdev->bdev, b2));
738 ev2 = md_event(refsb);
744 rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2;
746 if (rdev->size < sb->size && sb->level > 1)
747 /* "this cannot possibly happen" ... */
755 * validate_super for 0.90.0
757 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
760 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
761 __u64 ev1 = md_event(sb);
763 rdev->raid_disk = -1;
764 clear_bit(Faulty, &rdev->flags);
765 clear_bit(In_sync, &rdev->flags);
766 clear_bit(WriteMostly, &rdev->flags);
767 clear_bit(BarriersNotsupp, &rdev->flags);
769 if (mddev->raid_disks == 0) {
770 mddev->major_version = 0;
771 mddev->minor_version = sb->minor_version;
772 mddev->patch_version = sb->patch_version;
774 mddev->chunk_size = sb->chunk_size;
775 mddev->ctime = sb->ctime;
776 mddev->utime = sb->utime;
777 mddev->level = sb->level;
778 mddev->clevel[0] = 0;
779 mddev->layout = sb->layout;
780 mddev->raid_disks = sb->raid_disks;
781 mddev->size = sb->size;
783 mddev->bitmap_offset = 0;
784 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
786 if (mddev->minor_version >= 91) {
787 mddev->reshape_position = sb->reshape_position;
788 mddev->delta_disks = sb->delta_disks;
789 mddev->new_level = sb->new_level;
790 mddev->new_layout = sb->new_layout;
791 mddev->new_chunk = sb->new_chunk;
793 mddev->reshape_position = MaxSector;
794 mddev->delta_disks = 0;
795 mddev->new_level = mddev->level;
796 mddev->new_layout = mddev->layout;
797 mddev->new_chunk = mddev->chunk_size;
800 if (sb->state & (1<<MD_SB_CLEAN))
801 mddev->recovery_cp = MaxSector;
803 if (sb->events_hi == sb->cp_events_hi &&
804 sb->events_lo == sb->cp_events_lo) {
805 mddev->recovery_cp = sb->recovery_cp;
807 mddev->recovery_cp = 0;
810 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
811 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
812 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
813 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
815 mddev->max_disks = MD_SB_DISKS;
817 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
818 mddev->bitmap_file == NULL)
819 mddev->bitmap_offset = mddev->default_bitmap_offset;
821 } else if (mddev->pers == NULL) {
822 /* Insist on good event counter while assembling */
824 if (ev1 < mddev->events)
826 } else if (mddev->bitmap) {
827 /* if adding to array with a bitmap, then we can accept an
828 * older device ... but not too old.
830 if (ev1 < mddev->bitmap->events_cleared)
833 if (ev1 < mddev->events)
834 /* just a hot-add of a new device, leave raid_disk at -1 */
838 if (mddev->level != LEVEL_MULTIPATH) {
839 desc = sb->disks + rdev->desc_nr;
841 if (desc->state & (1<<MD_DISK_FAULTY))
842 set_bit(Faulty, &rdev->flags);
843 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
844 desc->raid_disk < mddev->raid_disks */) {
845 set_bit(In_sync, &rdev->flags);
846 rdev->raid_disk = desc->raid_disk;
848 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
849 set_bit(WriteMostly, &rdev->flags);
850 } else /* MULTIPATH are always insync */
851 set_bit(In_sync, &rdev->flags);
856 * sync_super for 0.90.0
858 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
861 struct list_head *tmp;
863 int next_spare = mddev->raid_disks;
866 /* make rdev->sb match mddev data..
869 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
870 * 3/ any empty disks < next_spare become removed
872 * disks[0] gets initialised to REMOVED because
873 * we cannot be sure from other fields if it has
874 * been initialised or not.
877 int active=0, working=0,failed=0,spare=0,nr_disks=0;
879 rdev->sb_size = MD_SB_BYTES;
881 sb = (mdp_super_t*)page_address(rdev->sb_page);
883 memset(sb, 0, sizeof(*sb));
885 sb->md_magic = MD_SB_MAGIC;
886 sb->major_version = mddev->major_version;
887 sb->patch_version = mddev->patch_version;
888 sb->gvalid_words = 0; /* ignored */
889 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
890 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
891 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
892 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
894 sb->ctime = mddev->ctime;
895 sb->level = mddev->level;
896 sb->size = mddev->size;
897 sb->raid_disks = mddev->raid_disks;
898 sb->md_minor = mddev->md_minor;
899 sb->not_persistent = 0;
900 sb->utime = mddev->utime;
902 sb->events_hi = (mddev->events>>32);
903 sb->events_lo = (u32)mddev->events;
905 if (mddev->reshape_position == MaxSector)
906 sb->minor_version = 90;
908 sb->minor_version = 91;
909 sb->reshape_position = mddev->reshape_position;
910 sb->new_level = mddev->new_level;
911 sb->delta_disks = mddev->delta_disks;
912 sb->new_layout = mddev->new_layout;
913 sb->new_chunk = mddev->new_chunk;
915 mddev->minor_version = sb->minor_version;
918 sb->recovery_cp = mddev->recovery_cp;
919 sb->cp_events_hi = (mddev->events>>32);
920 sb->cp_events_lo = (u32)mddev->events;
921 if (mddev->recovery_cp == MaxSector)
922 sb->state = (1<< MD_SB_CLEAN);
926 sb->layout = mddev->layout;
927 sb->chunk_size = mddev->chunk_size;
929 if (mddev->bitmap && mddev->bitmap_file == NULL)
930 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
932 sb->disks[0].state = (1<<MD_DISK_REMOVED);
933 rdev_for_each(rdev2, tmp, mddev) {
936 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
937 && !test_bit(Faulty, &rdev2->flags))
938 desc_nr = rdev2->raid_disk;
940 desc_nr = next_spare++;
941 rdev2->desc_nr = desc_nr;
942 d = &sb->disks[rdev2->desc_nr];
944 d->number = rdev2->desc_nr;
945 d->major = MAJOR(rdev2->bdev->bd_dev);
946 d->minor = MINOR(rdev2->bdev->bd_dev);
947 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
948 && !test_bit(Faulty, &rdev2->flags))
949 d->raid_disk = rdev2->raid_disk;
951 d->raid_disk = rdev2->desc_nr; /* compatibility */
952 if (test_bit(Faulty, &rdev2->flags))
953 d->state = (1<<MD_DISK_FAULTY);
954 else if (test_bit(In_sync, &rdev2->flags)) {
955 d->state = (1<<MD_DISK_ACTIVE);
956 d->state |= (1<<MD_DISK_SYNC);
964 if (test_bit(WriteMostly, &rdev2->flags))
965 d->state |= (1<<MD_DISK_WRITEMOSTLY);
967 /* now set the "removed" and "faulty" bits on any missing devices */
968 for (i=0 ; i < mddev->raid_disks ; i++) {
969 mdp_disk_t *d = &sb->disks[i];
970 if (d->state == 0 && d->number == 0) {
973 d->state = (1<<MD_DISK_REMOVED);
974 d->state |= (1<<MD_DISK_FAULTY);
978 sb->nr_disks = nr_disks;
979 sb->active_disks = active;
980 sb->working_disks = working;
981 sb->failed_disks = failed;
982 sb->spare_disks = spare;
984 sb->this_disk = sb->disks[rdev->desc_nr];
985 sb->sb_csum = calc_sb_csum(sb);
989 * rdev_size_change for 0.90.0
991 static unsigned long long
992 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
994 if (num_sectors && num_sectors < rdev->mddev->size * 2)
995 return 0; /* component must fit device */
996 if (rdev->mddev->bitmap_offset)
997 return 0; /* can't move bitmap */
998 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
999 if (!num_sectors || num_sectors > rdev->sb_start)
1000 num_sectors = rdev->sb_start;
1001 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1003 md_super_wait(rdev->mddev);
1004 return num_sectors / 2; /* kB for sysfs */
1009 * version 1 superblock
1012 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1016 unsigned long long newcsum;
1017 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1018 __le32 *isuper = (__le32*)sb;
1021 disk_csum = sb->sb_csum;
1024 for (i=0; size>=4; size -= 4 )
1025 newcsum += le32_to_cpu(*isuper++);
1028 newcsum += le16_to_cpu(*(__le16*) isuper);
1030 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1031 sb->sb_csum = disk_csum;
1032 return cpu_to_le32(csum);
1035 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1037 struct mdp_superblock_1 *sb;
1040 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1044 * Calculate the position of the superblock in 512byte sectors.
1045 * It is always aligned to a 4K boundary and
1046 * depeding on minor_version, it can be:
1047 * 0: At least 8K, but less than 12K, from end of device
1048 * 1: At start of device
1049 * 2: 4K from start of device.
1051 switch(minor_version) {
1053 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1055 sb_start &= ~(sector_t)(4*2-1);
1066 rdev->sb_start = sb_start;
1068 /* superblock is rarely larger than 1K, but it can be larger,
1069 * and it is safe to read 4k, so we do that
1071 ret = read_disk_sb(rdev, 4096);
1072 if (ret) return ret;
1075 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1077 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1078 sb->major_version != cpu_to_le32(1) ||
1079 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1080 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1081 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1084 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1085 printk("md: invalid superblock checksum on %s\n",
1086 bdevname(rdev->bdev,b));
1089 if (le64_to_cpu(sb->data_size) < 10) {
1090 printk("md: data_size too small on %s\n",
1091 bdevname(rdev->bdev,b));
1094 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1095 if (sb->level != cpu_to_le32(1) &&
1096 sb->level != cpu_to_le32(4) &&
1097 sb->level != cpu_to_le32(5) &&
1098 sb->level != cpu_to_le32(6) &&
1099 sb->level != cpu_to_le32(10)) {
1101 "md: bitmaps not supported for this level.\n");
1106 rdev->preferred_minor = 0xffff;
1107 rdev->data_offset = le64_to_cpu(sb->data_offset);
1108 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1110 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1111 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1112 if (rdev->sb_size & bmask)
1113 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1116 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1119 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1122 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1128 struct mdp_superblock_1 *refsb =
1129 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1131 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1132 sb->level != refsb->level ||
1133 sb->layout != refsb->layout ||
1134 sb->chunksize != refsb->chunksize) {
1135 printk(KERN_WARNING "md: %s has strangely different"
1136 " superblock to %s\n",
1137 bdevname(rdev->bdev,b),
1138 bdevname(refdev->bdev,b2));
1141 ev1 = le64_to_cpu(sb->events);
1142 ev2 = le64_to_cpu(refsb->events);
1150 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1152 rdev->size = rdev->sb_start / 2;
1153 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1155 rdev->size = le64_to_cpu(sb->data_size)/2;
1156 if (le32_to_cpu(sb->chunksize))
1157 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1159 if (le64_to_cpu(sb->size) > rdev->size*2)
1164 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1166 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1167 __u64 ev1 = le64_to_cpu(sb->events);
1169 rdev->raid_disk = -1;
1170 clear_bit(Faulty, &rdev->flags);
1171 clear_bit(In_sync, &rdev->flags);
1172 clear_bit(WriteMostly, &rdev->flags);
1173 clear_bit(BarriersNotsupp, &rdev->flags);
1175 if (mddev->raid_disks == 0) {
1176 mddev->major_version = 1;
1177 mddev->patch_version = 0;
1178 mddev->external = 0;
1179 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1180 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1181 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1182 mddev->level = le32_to_cpu(sb->level);
1183 mddev->clevel[0] = 0;
1184 mddev->layout = le32_to_cpu(sb->layout);
1185 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1186 mddev->size = le64_to_cpu(sb->size)/2;
1187 mddev->events = ev1;
1188 mddev->bitmap_offset = 0;
1189 mddev->default_bitmap_offset = 1024 >> 9;
1191 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1192 memcpy(mddev->uuid, sb->set_uuid, 16);
1194 mddev->max_disks = (4096-256)/2;
1196 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1197 mddev->bitmap_file == NULL )
1198 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1200 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1201 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1202 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1203 mddev->new_level = le32_to_cpu(sb->new_level);
1204 mddev->new_layout = le32_to_cpu(sb->new_layout);
1205 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1207 mddev->reshape_position = MaxSector;
1208 mddev->delta_disks = 0;
1209 mddev->new_level = mddev->level;
1210 mddev->new_layout = mddev->layout;
1211 mddev->new_chunk = mddev->chunk_size;
1214 } else if (mddev->pers == NULL) {
1215 /* Insist of good event counter while assembling */
1217 if (ev1 < mddev->events)
1219 } else if (mddev->bitmap) {
1220 /* If adding to array with a bitmap, then we can accept an
1221 * older device, but not too old.
1223 if (ev1 < mddev->bitmap->events_cleared)
1226 if (ev1 < mddev->events)
1227 /* just a hot-add of a new device, leave raid_disk at -1 */
1230 if (mddev->level != LEVEL_MULTIPATH) {
1232 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1234 case 0xffff: /* spare */
1236 case 0xfffe: /* faulty */
1237 set_bit(Faulty, &rdev->flags);
1240 if ((le32_to_cpu(sb->feature_map) &
1241 MD_FEATURE_RECOVERY_OFFSET))
1242 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1244 set_bit(In_sync, &rdev->flags);
1245 rdev->raid_disk = role;
1248 if (sb->devflags & WriteMostly1)
1249 set_bit(WriteMostly, &rdev->flags);
1250 } else /* MULTIPATH are always insync */
1251 set_bit(In_sync, &rdev->flags);
1256 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1258 struct mdp_superblock_1 *sb;
1259 struct list_head *tmp;
1262 /* make rdev->sb match mddev and rdev data. */
1264 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1266 sb->feature_map = 0;
1268 sb->recovery_offset = cpu_to_le64(0);
1269 memset(sb->pad1, 0, sizeof(sb->pad1));
1270 memset(sb->pad2, 0, sizeof(sb->pad2));
1271 memset(sb->pad3, 0, sizeof(sb->pad3));
1273 sb->utime = cpu_to_le64((__u64)mddev->utime);
1274 sb->events = cpu_to_le64(mddev->events);
1276 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1278 sb->resync_offset = cpu_to_le64(0);
1280 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1282 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1283 sb->size = cpu_to_le64(mddev->size<<1);
1285 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1286 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1287 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1290 if (rdev->raid_disk >= 0 &&
1291 !test_bit(In_sync, &rdev->flags) &&
1292 rdev->recovery_offset > 0) {
1293 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1294 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1297 if (mddev->reshape_position != MaxSector) {
1298 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1299 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1300 sb->new_layout = cpu_to_le32(mddev->new_layout);
1301 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1302 sb->new_level = cpu_to_le32(mddev->new_level);
1303 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1307 rdev_for_each(rdev2, tmp, mddev)
1308 if (rdev2->desc_nr+1 > max_dev)
1309 max_dev = rdev2->desc_nr+1;
1311 if (max_dev > le32_to_cpu(sb->max_dev))
1312 sb->max_dev = cpu_to_le32(max_dev);
1313 for (i=0; i<max_dev;i++)
1314 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1316 rdev_for_each(rdev2, tmp, mddev) {
1318 if (test_bit(Faulty, &rdev2->flags))
1319 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1320 else if (test_bit(In_sync, &rdev2->flags))
1321 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1322 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1323 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1325 sb->dev_roles[i] = cpu_to_le16(0xffff);
1328 sb->sb_csum = calc_sb_1_csum(sb);
1331 static unsigned long long
1332 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1334 struct mdp_superblock_1 *sb;
1335 sector_t max_sectors;
1336 if (num_sectors && num_sectors < rdev->mddev->size * 2)
1337 return 0; /* component must fit device */
1338 if (rdev->sb_start < rdev->data_offset) {
1339 /* minor versions 1 and 2; superblock before data */
1340 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1341 max_sectors -= rdev->data_offset;
1342 if (!num_sectors || num_sectors > max_sectors)
1343 num_sectors = max_sectors;
1344 } else if (rdev->mddev->bitmap_offset) {
1345 /* minor version 0 with bitmap we can't move */
1348 /* minor version 0; superblock after data */
1350 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1351 sb_start &= ~(sector_t)(4*2 - 1);
1352 max_sectors = rdev->size * 2 + sb_start - rdev->sb_start;
1353 if (!num_sectors || num_sectors > max_sectors)
1354 num_sectors = max_sectors;
1355 rdev->sb_start = sb_start;
1357 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1358 sb->data_size = cpu_to_le64(num_sectors);
1359 sb->super_offset = rdev->sb_start;
1360 sb->sb_csum = calc_sb_1_csum(sb);
1361 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1363 md_super_wait(rdev->mddev);
1364 return num_sectors / 2; /* kB for sysfs */
1367 static struct super_type super_types[] = {
1370 .owner = THIS_MODULE,
1371 .load_super = super_90_load,
1372 .validate_super = super_90_validate,
1373 .sync_super = super_90_sync,
1374 .rdev_size_change = super_90_rdev_size_change,
1378 .owner = THIS_MODULE,
1379 .load_super = super_1_load,
1380 .validate_super = super_1_validate,
1381 .sync_super = super_1_sync,
1382 .rdev_size_change = super_1_rdev_size_change,
1386 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1388 mdk_rdev_t *rdev, *rdev2;
1391 rdev_for_each_rcu(rdev, mddev1)
1392 rdev_for_each_rcu(rdev2, mddev2)
1393 if (rdev->bdev->bd_contains ==
1394 rdev2->bdev->bd_contains) {
1402 static LIST_HEAD(pending_raid_disks);
1404 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1406 char b[BDEVNAME_SIZE];
1416 /* prevent duplicates */
1417 if (find_rdev(mddev, rdev->bdev->bd_dev))
1420 /* make sure rdev->size exceeds mddev->size */
1421 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1423 /* Cannot change size, so fail
1424 * If mddev->level <= 0, then we don't care
1425 * about aligning sizes (e.g. linear)
1427 if (mddev->level > 0)
1430 mddev->size = rdev->size;
1433 /* Verify rdev->desc_nr is unique.
1434 * If it is -1, assign a free number, else
1435 * check number is not in use
1437 if (rdev->desc_nr < 0) {
1439 if (mddev->pers) choice = mddev->raid_disks;
1440 while (find_rdev_nr(mddev, choice))
1442 rdev->desc_nr = choice;
1444 if (find_rdev_nr(mddev, rdev->desc_nr))
1447 bdevname(rdev->bdev,b);
1448 while ( (s=strchr(b, '/')) != NULL)
1451 rdev->mddev = mddev;
1452 printk(KERN_INFO "md: bind<%s>\n", b);
1454 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1457 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1458 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1459 kobject_del(&rdev->kobj);
1462 list_add_rcu(&rdev->same_set, &mddev->disks);
1463 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1467 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1472 static void md_delayed_delete(struct work_struct *ws)
1474 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1475 kobject_del(&rdev->kobj);
1476 kobject_put(&rdev->kobj);
1479 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1481 char b[BDEVNAME_SIZE];
1486 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1487 list_del_rcu(&rdev->same_set);
1488 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1490 sysfs_remove_link(&rdev->kobj, "block");
1492 /* We need to delay this, otherwise we can deadlock when
1493 * writing to 'remove' to "dev/state". We also need
1494 * to delay it due to rcu usage.
1497 INIT_WORK(&rdev->del_work, md_delayed_delete);
1498 kobject_get(&rdev->kobj);
1499 schedule_work(&rdev->del_work);
1503 * prevent the device from being mounted, repartitioned or
1504 * otherwise reused by a RAID array (or any other kernel
1505 * subsystem), by bd_claiming the device.
1507 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1510 struct block_device *bdev;
1511 char b[BDEVNAME_SIZE];
1513 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1515 printk(KERN_ERR "md: could not open %s.\n",
1516 __bdevname(dev, b));
1517 return PTR_ERR(bdev);
1519 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1521 printk(KERN_ERR "md: could not bd_claim %s.\n",
1527 set_bit(AllReserved, &rdev->flags);
1532 static void unlock_rdev(mdk_rdev_t *rdev)
1534 struct block_device *bdev = rdev->bdev;
1542 void md_autodetect_dev(dev_t dev);
1544 static void export_rdev(mdk_rdev_t * rdev)
1546 char b[BDEVNAME_SIZE];
1547 printk(KERN_INFO "md: export_rdev(%s)\n",
1548 bdevname(rdev->bdev,b));
1553 if (test_bit(AutoDetected, &rdev->flags))
1554 md_autodetect_dev(rdev->bdev->bd_dev);
1557 kobject_put(&rdev->kobj);
1560 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1562 unbind_rdev_from_array(rdev);
1566 static void export_array(mddev_t *mddev)
1568 struct list_head *tmp;
1571 rdev_for_each(rdev, tmp, mddev) {
1576 kick_rdev_from_array(rdev);
1578 if (!list_empty(&mddev->disks))
1580 mddev->raid_disks = 0;
1581 mddev->major_version = 0;
1584 static void print_desc(mdp_disk_t *desc)
1586 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1587 desc->major,desc->minor,desc->raid_disk,desc->state);
1590 static void print_sb(mdp_super_t *sb)
1595 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1596 sb->major_version, sb->minor_version, sb->patch_version,
1597 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1599 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1600 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1601 sb->md_minor, sb->layout, sb->chunk_size);
1602 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1603 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1604 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1605 sb->failed_disks, sb->spare_disks,
1606 sb->sb_csum, (unsigned long)sb->events_lo);
1609 for (i = 0; i < MD_SB_DISKS; i++) {
1612 desc = sb->disks + i;
1613 if (desc->number || desc->major || desc->minor ||
1614 desc->raid_disk || (desc->state && (desc->state != 4))) {
1615 printk(" D %2d: ", i);
1619 printk(KERN_INFO "md: THIS: ");
1620 print_desc(&sb->this_disk);
1624 static void print_rdev(mdk_rdev_t *rdev)
1626 char b[BDEVNAME_SIZE];
1627 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1628 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1629 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1631 if (rdev->sb_loaded) {
1632 printk(KERN_INFO "md: rdev superblock:\n");
1633 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1635 printk(KERN_INFO "md: no rdev superblock!\n");
1638 static void md_print_devices(void)
1640 struct list_head *tmp, *tmp2;
1643 char b[BDEVNAME_SIZE];
1646 printk("md: **********************************\n");
1647 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1648 printk("md: **********************************\n");
1649 for_each_mddev(mddev, tmp) {
1652 bitmap_print_sb(mddev->bitmap);
1654 printk("%s: ", mdname(mddev));
1655 rdev_for_each(rdev, tmp2, mddev)
1656 printk("<%s>", bdevname(rdev->bdev,b));
1659 rdev_for_each(rdev, tmp2, mddev)
1662 printk("md: **********************************\n");
1667 static void sync_sbs(mddev_t * mddev, int nospares)
1669 /* Update each superblock (in-memory image), but
1670 * if we are allowed to, skip spares which already
1671 * have the right event counter, or have one earlier
1672 * (which would mean they aren't being marked as dirty
1673 * with the rest of the array)
1676 struct list_head *tmp;
1678 rdev_for_each(rdev, tmp, mddev) {
1679 if (rdev->sb_events == mddev->events ||
1681 rdev->raid_disk < 0 &&
1682 (rdev->sb_events&1)==0 &&
1683 rdev->sb_events+1 == mddev->events)) {
1684 /* Don't update this superblock */
1685 rdev->sb_loaded = 2;
1687 super_types[mddev->major_version].
1688 sync_super(mddev, rdev);
1689 rdev->sb_loaded = 1;
1694 static void md_update_sb(mddev_t * mddev, int force_change)
1696 struct list_head *tmp;
1701 if (mddev->external)
1704 spin_lock_irq(&mddev->write_lock);
1706 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1707 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1709 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1710 /* just a clean<-> dirty transition, possibly leave spares alone,
1711 * though if events isn't the right even/odd, we will have to do
1717 if (mddev->degraded)
1718 /* If the array is degraded, then skipping spares is both
1719 * dangerous and fairly pointless.
1720 * Dangerous because a device that was removed from the array
1721 * might have a event_count that still looks up-to-date,
1722 * so it can be re-added without a resync.
1723 * Pointless because if there are any spares to skip,
1724 * then a recovery will happen and soon that array won't
1725 * be degraded any more and the spare can go back to sleep then.
1729 sync_req = mddev->in_sync;
1730 mddev->utime = get_seconds();
1732 /* If this is just a dirty<->clean transition, and the array is clean
1733 * and 'events' is odd, we can roll back to the previous clean state */
1735 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1736 && (mddev->events & 1)
1737 && mddev->events != 1)
1740 /* otherwise we have to go forward and ... */
1742 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1743 /* .. if the array isn't clean, insist on an odd 'events' */
1744 if ((mddev->events&1)==0) {
1749 /* otherwise insist on an even 'events' (for clean states) */
1750 if ((mddev->events&1)) {
1757 if (!mddev->events) {
1759 * oops, this 64-bit counter should never wrap.
1760 * Either we are in around ~1 trillion A.C., assuming
1761 * 1 reboot per second, or we have a bug:
1768 * do not write anything to disk if using
1769 * nonpersistent superblocks
1771 if (!mddev->persistent) {
1772 if (!mddev->external)
1773 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1775 spin_unlock_irq(&mddev->write_lock);
1776 wake_up(&mddev->sb_wait);
1779 sync_sbs(mddev, nospares);
1780 spin_unlock_irq(&mddev->write_lock);
1783 "md: updating %s RAID superblock on device (in sync %d)\n",
1784 mdname(mddev),mddev->in_sync);
1786 bitmap_update_sb(mddev->bitmap);
1787 rdev_for_each(rdev, tmp, mddev) {
1788 char b[BDEVNAME_SIZE];
1789 dprintk(KERN_INFO "md: ");
1790 if (rdev->sb_loaded != 1)
1791 continue; /* no noise on spare devices */
1792 if (test_bit(Faulty, &rdev->flags))
1793 dprintk("(skipping faulty ");
1795 dprintk("%s ", bdevname(rdev->bdev,b));
1796 if (!test_bit(Faulty, &rdev->flags)) {
1797 md_super_write(mddev,rdev,
1798 rdev->sb_start, rdev->sb_size,
1800 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1801 bdevname(rdev->bdev,b),
1802 (unsigned long long)rdev->sb_start);
1803 rdev->sb_events = mddev->events;
1807 if (mddev->level == LEVEL_MULTIPATH)
1808 /* only need to write one superblock... */
1811 md_super_wait(mddev);
1812 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1814 spin_lock_irq(&mddev->write_lock);
1815 if (mddev->in_sync != sync_req ||
1816 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1817 /* have to write it out again */
1818 spin_unlock_irq(&mddev->write_lock);
1821 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1822 spin_unlock_irq(&mddev->write_lock);
1823 wake_up(&mddev->sb_wait);
1827 /* words written to sysfs files may, or may not, be \n terminated.
1828 * We want to accept with case. For this we use cmd_match.
1830 static int cmd_match(const char *cmd, const char *str)
1832 /* See if cmd, written into a sysfs file, matches
1833 * str. They must either be the same, or cmd can
1834 * have a trailing newline
1836 while (*cmd && *str && *cmd == *str) {
1847 struct rdev_sysfs_entry {
1848 struct attribute attr;
1849 ssize_t (*show)(mdk_rdev_t *, char *);
1850 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1854 state_show(mdk_rdev_t *rdev, char *page)
1859 if (test_bit(Faulty, &rdev->flags)) {
1860 len+= sprintf(page+len, "%sfaulty",sep);
1863 if (test_bit(In_sync, &rdev->flags)) {
1864 len += sprintf(page+len, "%sin_sync",sep);
1867 if (test_bit(WriteMostly, &rdev->flags)) {
1868 len += sprintf(page+len, "%swrite_mostly",sep);
1871 if (test_bit(Blocked, &rdev->flags)) {
1872 len += sprintf(page+len, "%sblocked", sep);
1875 if (!test_bit(Faulty, &rdev->flags) &&
1876 !test_bit(In_sync, &rdev->flags)) {
1877 len += sprintf(page+len, "%sspare", sep);
1880 return len+sprintf(page+len, "\n");
1884 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1887 * faulty - simulates and error
1888 * remove - disconnects the device
1889 * writemostly - sets write_mostly
1890 * -writemostly - clears write_mostly
1891 * blocked - sets the Blocked flag
1892 * -blocked - clears the Blocked flag
1895 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1896 md_error(rdev->mddev, rdev);
1898 } else if (cmd_match(buf, "remove")) {
1899 if (rdev->raid_disk >= 0)
1902 mddev_t *mddev = rdev->mddev;
1903 kick_rdev_from_array(rdev);
1905 md_update_sb(mddev, 1);
1906 md_new_event(mddev);
1909 } else if (cmd_match(buf, "writemostly")) {
1910 set_bit(WriteMostly, &rdev->flags);
1912 } else if (cmd_match(buf, "-writemostly")) {
1913 clear_bit(WriteMostly, &rdev->flags);
1915 } else if (cmd_match(buf, "blocked")) {
1916 set_bit(Blocked, &rdev->flags);
1918 } else if (cmd_match(buf, "-blocked")) {
1919 clear_bit(Blocked, &rdev->flags);
1920 wake_up(&rdev->blocked_wait);
1921 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1922 md_wakeup_thread(rdev->mddev->thread);
1927 sysfs_notify(&rdev->kobj, NULL, "state");
1928 return err ? err : len;
1930 static struct rdev_sysfs_entry rdev_state =
1931 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1934 errors_show(mdk_rdev_t *rdev, char *page)
1936 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1940 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1943 unsigned long n = simple_strtoul(buf, &e, 10);
1944 if (*buf && (*e == 0 || *e == '\n')) {
1945 atomic_set(&rdev->corrected_errors, n);
1950 static struct rdev_sysfs_entry rdev_errors =
1951 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1954 slot_show(mdk_rdev_t *rdev, char *page)
1956 if (rdev->raid_disk < 0)
1957 return sprintf(page, "none\n");
1959 return sprintf(page, "%d\n", rdev->raid_disk);
1963 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1968 int slot = simple_strtoul(buf, &e, 10);
1969 if (strncmp(buf, "none", 4)==0)
1971 else if (e==buf || (*e && *e!= '\n'))
1973 if (rdev->mddev->pers && slot == -1) {
1974 /* Setting 'slot' on an active array requires also
1975 * updating the 'rd%d' link, and communicating
1976 * with the personality with ->hot_*_disk.
1977 * For now we only support removing
1978 * failed/spare devices. This normally happens automatically,
1979 * but not when the metadata is externally managed.
1981 if (rdev->raid_disk == -1)
1983 /* personality does all needed checks */
1984 if (rdev->mddev->pers->hot_add_disk == NULL)
1986 err = rdev->mddev->pers->
1987 hot_remove_disk(rdev->mddev, rdev->raid_disk);
1990 sprintf(nm, "rd%d", rdev->raid_disk);
1991 sysfs_remove_link(&rdev->mddev->kobj, nm);
1992 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1993 md_wakeup_thread(rdev->mddev->thread);
1994 } else if (rdev->mddev->pers) {
1996 struct list_head *tmp;
1997 /* Activating a spare .. or possibly reactivating
1998 * if we every get bitmaps working here.
2001 if (rdev->raid_disk != -1)
2004 if (rdev->mddev->pers->hot_add_disk == NULL)
2007 rdev_for_each(rdev2, tmp, rdev->mddev)
2008 if (rdev2->raid_disk == slot)
2011 rdev->raid_disk = slot;
2012 if (test_bit(In_sync, &rdev->flags))
2013 rdev->saved_raid_disk = slot;
2015 rdev->saved_raid_disk = -1;
2016 err = rdev->mddev->pers->
2017 hot_add_disk(rdev->mddev, rdev);
2019 rdev->raid_disk = -1;
2022 sysfs_notify(&rdev->kobj, NULL, "state");
2023 sprintf(nm, "rd%d", rdev->raid_disk);
2024 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2026 "md: cannot register "
2028 nm, mdname(rdev->mddev));
2030 /* don't wakeup anyone, leave that to userspace. */
2032 if (slot >= rdev->mddev->raid_disks)
2034 rdev->raid_disk = slot;
2035 /* assume it is working */
2036 clear_bit(Faulty, &rdev->flags);
2037 clear_bit(WriteMostly, &rdev->flags);
2038 set_bit(In_sync, &rdev->flags);
2039 sysfs_notify(&rdev->kobj, NULL, "state");
2045 static struct rdev_sysfs_entry rdev_slot =
2046 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2049 offset_show(mdk_rdev_t *rdev, char *page)
2051 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2055 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2058 unsigned long long offset = simple_strtoull(buf, &e, 10);
2059 if (e==buf || (*e && *e != '\n'))
2061 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2063 if (rdev->size && rdev->mddev->external)
2064 /* Must set offset before size, so overlap checks
2067 rdev->data_offset = offset;
2071 static struct rdev_sysfs_entry rdev_offset =
2072 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2075 rdev_size_show(mdk_rdev_t *rdev, char *page)
2077 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2080 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2082 /* check if two start/length pairs overlap */
2091 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2093 unsigned long long size;
2094 unsigned long long oldsize = rdev->size;
2095 mddev_t *my_mddev = rdev->mddev;
2097 if (strict_strtoull(buf, 10, &size) < 0)
2099 if (my_mddev->pers && rdev->raid_disk >= 0) {
2100 if (my_mddev->persistent) {
2101 size = super_types[my_mddev->major_version].
2102 rdev_size_change(rdev, size * 2);
2106 size = (rdev->bdev->bd_inode->i_size >> 10);
2107 size -= rdev->data_offset/2;
2110 if (size < my_mddev->size)
2111 return -EINVAL; /* component must fit device */
2114 if (size > oldsize && my_mddev->external) {
2115 /* need to check that all other rdevs with the same ->bdev
2116 * do not overlap. We need to unlock the mddev to avoid
2117 * a deadlock. We have already changed rdev->size, and if
2118 * we have to change it back, we will have the lock again.
2122 struct list_head *tmp, *tmp2;
2124 mddev_unlock(my_mddev);
2125 for_each_mddev(mddev, tmp) {
2129 rdev_for_each(rdev2, tmp2, mddev)
2130 if (test_bit(AllReserved, &rdev2->flags) ||
2131 (rdev->bdev == rdev2->bdev &&
2133 overlaps(rdev->data_offset, rdev->size * 2,
2135 rdev2->size * 2))) {
2139 mddev_unlock(mddev);
2145 mddev_lock(my_mddev);
2147 /* Someone else could have slipped in a size
2148 * change here, but doing so is just silly.
2149 * We put oldsize back because we *know* it is
2150 * safe, and trust userspace not to race with
2153 rdev->size = oldsize;
2160 static struct rdev_sysfs_entry rdev_size =
2161 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2163 static struct attribute *rdev_default_attrs[] = {
2172 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2174 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2175 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2176 mddev_t *mddev = rdev->mddev;
2182 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2184 if (rdev->mddev == NULL)
2187 rv = entry->show(rdev, page);
2188 mddev_unlock(mddev);
2194 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2195 const char *page, size_t length)
2197 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2198 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2200 mddev_t *mddev = rdev->mddev;
2204 if (!capable(CAP_SYS_ADMIN))
2206 rv = mddev ? mddev_lock(mddev): -EBUSY;
2208 if (rdev->mddev == NULL)
2211 rv = entry->store(rdev, page, length);
2212 mddev_unlock(mddev);
2217 static void rdev_free(struct kobject *ko)
2219 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2222 static struct sysfs_ops rdev_sysfs_ops = {
2223 .show = rdev_attr_show,
2224 .store = rdev_attr_store,
2226 static struct kobj_type rdev_ktype = {
2227 .release = rdev_free,
2228 .sysfs_ops = &rdev_sysfs_ops,
2229 .default_attrs = rdev_default_attrs,
2233 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2235 * mark the device faulty if:
2237 * - the device is nonexistent (zero size)
2238 * - the device has no valid superblock
2240 * a faulty rdev _never_ has rdev->sb set.
2242 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2244 char b[BDEVNAME_SIZE];
2249 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2251 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2252 return ERR_PTR(-ENOMEM);
2255 if ((err = alloc_disk_sb(rdev)))
2258 err = lock_rdev(rdev, newdev, super_format == -2);
2262 kobject_init(&rdev->kobj, &rdev_ktype);
2265 rdev->saved_raid_disk = -1;
2266 rdev->raid_disk = -1;
2268 rdev->data_offset = 0;
2269 rdev->sb_events = 0;
2270 atomic_set(&rdev->nr_pending, 0);
2271 atomic_set(&rdev->read_errors, 0);
2272 atomic_set(&rdev->corrected_errors, 0);
2274 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2277 "md: %s has zero or unknown size, marking faulty!\n",
2278 bdevname(rdev->bdev,b));
2283 if (super_format >= 0) {
2284 err = super_types[super_format].
2285 load_super(rdev, NULL, super_minor);
2286 if (err == -EINVAL) {
2288 "md: %s does not have a valid v%d.%d "
2289 "superblock, not importing!\n",
2290 bdevname(rdev->bdev,b),
2291 super_format, super_minor);
2296 "md: could not read %s's sb, not importing!\n",
2297 bdevname(rdev->bdev,b));
2302 INIT_LIST_HEAD(&rdev->same_set);
2303 init_waitqueue_head(&rdev->blocked_wait);
2308 if (rdev->sb_page) {
2314 return ERR_PTR(err);
2318 * Check a full RAID array for plausibility
2322 static void analyze_sbs(mddev_t * mddev)
2325 struct list_head *tmp;
2326 mdk_rdev_t *rdev, *freshest;
2327 char b[BDEVNAME_SIZE];
2330 rdev_for_each(rdev, tmp, mddev)
2331 switch (super_types[mddev->major_version].
2332 load_super(rdev, freshest, mddev->minor_version)) {
2340 "md: fatal superblock inconsistency in %s"
2341 " -- removing from array\n",
2342 bdevname(rdev->bdev,b));
2343 kick_rdev_from_array(rdev);
2347 super_types[mddev->major_version].
2348 validate_super(mddev, freshest);
2351 rdev_for_each(rdev, tmp, mddev) {
2352 if (rdev != freshest)
2353 if (super_types[mddev->major_version].
2354 validate_super(mddev, rdev)) {
2355 printk(KERN_WARNING "md: kicking non-fresh %s"
2357 bdevname(rdev->bdev,b));
2358 kick_rdev_from_array(rdev);
2361 if (mddev->level == LEVEL_MULTIPATH) {
2362 rdev->desc_nr = i++;
2363 rdev->raid_disk = rdev->desc_nr;
2364 set_bit(In_sync, &rdev->flags);
2365 } else if (rdev->raid_disk >= mddev->raid_disks) {
2366 rdev->raid_disk = -1;
2367 clear_bit(In_sync, &rdev->flags);
2373 if (mddev->recovery_cp != MaxSector &&
2375 printk(KERN_ERR "md: %s: raid array is not clean"
2376 " -- starting background reconstruction\n",
2381 static void md_safemode_timeout(unsigned long data);
2384 safe_delay_show(mddev_t *mddev, char *page)
2386 int msec = (mddev->safemode_delay*1000)/HZ;
2387 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2390 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2398 /* remove a period, and count digits after it */
2399 if (len >= sizeof(buf))
2401 strlcpy(buf, cbuf, len);
2403 for (i=0; i<len; i++) {
2405 if (isdigit(buf[i])) {
2410 } else if (buf[i] == '.') {
2415 msec = simple_strtoul(buf, &e, 10);
2416 if (e == buf || (*e && *e != '\n'))
2418 msec = (msec * 1000) / scale;
2420 mddev->safemode_delay = 0;
2422 unsigned long old_delay = mddev->safemode_delay;
2423 mddev->safemode_delay = (msec*HZ)/1000;
2424 if (mddev->safemode_delay == 0)
2425 mddev->safemode_delay = 1;
2426 if (mddev->safemode_delay < old_delay)
2427 md_safemode_timeout((unsigned long)mddev);
2431 static struct md_sysfs_entry md_safe_delay =
2432 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2435 level_show(mddev_t *mddev, char *page)
2437 struct mdk_personality *p = mddev->pers;
2439 return sprintf(page, "%s\n", p->name);
2440 else if (mddev->clevel[0])
2441 return sprintf(page, "%s\n", mddev->clevel);
2442 else if (mddev->level != LEVEL_NONE)
2443 return sprintf(page, "%d\n", mddev->level);
2449 level_store(mddev_t *mddev, const char *buf, size_t len)
2456 if (len >= sizeof(mddev->clevel))
2458 strncpy(mddev->clevel, buf, len);
2459 if (mddev->clevel[len-1] == '\n')
2461 mddev->clevel[len] = 0;
2462 mddev->level = LEVEL_NONE;
2466 static struct md_sysfs_entry md_level =
2467 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2471 layout_show(mddev_t *mddev, char *page)
2473 /* just a number, not meaningful for all levels */
2474 if (mddev->reshape_position != MaxSector &&
2475 mddev->layout != mddev->new_layout)
2476 return sprintf(page, "%d (%d)\n",
2477 mddev->new_layout, mddev->layout);
2478 return sprintf(page, "%d\n", mddev->layout);
2482 layout_store(mddev_t *mddev, const char *buf, size_t len)
2485 unsigned long n = simple_strtoul(buf, &e, 10);
2487 if (!*buf || (*e && *e != '\n'))
2492 if (mddev->reshape_position != MaxSector)
2493 mddev->new_layout = n;
2498 static struct md_sysfs_entry md_layout =
2499 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2503 raid_disks_show(mddev_t *mddev, char *page)
2505 if (mddev->raid_disks == 0)
2507 if (mddev->reshape_position != MaxSector &&
2508 mddev->delta_disks != 0)
2509 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2510 mddev->raid_disks - mddev->delta_disks);
2511 return sprintf(page, "%d\n", mddev->raid_disks);
2514 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2517 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2521 unsigned long n = simple_strtoul(buf, &e, 10);
2523 if (!*buf || (*e && *e != '\n'))
2527 rv = update_raid_disks(mddev, n);
2528 else if (mddev->reshape_position != MaxSector) {
2529 int olddisks = mddev->raid_disks - mddev->delta_disks;
2530 mddev->delta_disks = n - olddisks;
2531 mddev->raid_disks = n;
2533 mddev->raid_disks = n;
2534 return rv ? rv : len;
2536 static struct md_sysfs_entry md_raid_disks =
2537 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2540 chunk_size_show(mddev_t *mddev, char *page)
2542 if (mddev->reshape_position != MaxSector &&
2543 mddev->chunk_size != mddev->new_chunk)
2544 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2546 return sprintf(page, "%d\n", mddev->chunk_size);
2550 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2552 /* can only set chunk_size if array is not yet active */
2554 unsigned long n = simple_strtoul(buf, &e, 10);
2556 if (!*buf || (*e && *e != '\n'))
2561 else if (mddev->reshape_position != MaxSector)
2562 mddev->new_chunk = n;
2564 mddev->chunk_size = n;
2567 static struct md_sysfs_entry md_chunk_size =
2568 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2571 resync_start_show(mddev_t *mddev, char *page)
2573 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2577 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2580 unsigned long long n = simple_strtoull(buf, &e, 10);
2584 if (!*buf || (*e && *e != '\n'))
2587 mddev->recovery_cp = n;
2590 static struct md_sysfs_entry md_resync_start =
2591 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2594 * The array state can be:
2597 * No devices, no size, no level
2598 * Equivalent to STOP_ARRAY ioctl
2600 * May have some settings, but array is not active
2601 * all IO results in error
2602 * When written, doesn't tear down array, but just stops it
2603 * suspended (not supported yet)
2604 * All IO requests will block. The array can be reconfigured.
2605 * Writing this, if accepted, will block until array is quiescent
2607 * no resync can happen. no superblocks get written.
2608 * write requests fail
2610 * like readonly, but behaves like 'clean' on a write request.
2612 * clean - no pending writes, but otherwise active.
2613 * When written to inactive array, starts without resync
2614 * If a write request arrives then
2615 * if metadata is known, mark 'dirty' and switch to 'active'.
2616 * if not known, block and switch to write-pending
2617 * If written to an active array that has pending writes, then fails.
2619 * fully active: IO and resync can be happening.
2620 * When written to inactive array, starts with resync
2623 * clean, but writes are blocked waiting for 'active' to be written.
2626 * like active, but no writes have been seen for a while (100msec).
2629 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2630 write_pending, active_idle, bad_word};
2631 static char *array_states[] = {
2632 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2633 "write-pending", "active-idle", NULL };
2635 static int match_word(const char *word, char **list)
2638 for (n=0; list[n]; n++)
2639 if (cmd_match(word, list[n]))
2645 array_state_show(mddev_t *mddev, char *page)
2647 enum array_state st = inactive;
2660 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2662 else if (mddev->safemode)
2668 if (list_empty(&mddev->disks) &&
2669 mddev->raid_disks == 0 &&
2675 return sprintf(page, "%s\n", array_states[st]);
2678 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
2679 static int do_md_run(mddev_t * mddev);
2680 static int restart_array(mddev_t *mddev);
2683 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2686 enum array_state st = match_word(buf, array_states);
2691 /* stopping an active array */
2692 if (atomic_read(&mddev->openers) > 0)
2694 err = do_md_stop(mddev, 0, 0);
2697 /* stopping an active array */
2699 if (atomic_read(&mddev->openers) > 0)
2701 err = do_md_stop(mddev, 2, 0);
2703 err = 0; /* already inactive */
2706 break; /* not supported yet */
2709 err = do_md_stop(mddev, 1, 0);
2712 set_disk_ro(mddev->gendisk, 1);
2713 err = do_md_run(mddev);
2719 err = do_md_stop(mddev, 1, 0);
2720 else if (mddev->ro == 1)
2721 err = restart_array(mddev);
2724 set_disk_ro(mddev->gendisk, 0);
2728 err = do_md_run(mddev);
2733 restart_array(mddev);
2734 spin_lock_irq(&mddev->write_lock);
2735 if (atomic_read(&mddev->writes_pending) == 0) {
2736 if (mddev->in_sync == 0) {
2738 if (mddev->safemode == 1)
2739 mddev->safemode = 0;
2740 if (mddev->persistent)
2741 set_bit(MD_CHANGE_CLEAN,
2747 spin_unlock_irq(&mddev->write_lock);
2750 mddev->recovery_cp = MaxSector;
2751 err = do_md_run(mddev);
2756 restart_array(mddev);
2757 if (mddev->external)
2758 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2759 wake_up(&mddev->sb_wait);
2763 set_disk_ro(mddev->gendisk, 0);
2764 err = do_md_run(mddev);
2769 /* these cannot be set */
2775 sysfs_notify(&mddev->kobj, NULL, "array_state");
2779 static struct md_sysfs_entry md_array_state =
2780 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2783 null_show(mddev_t *mddev, char *page)
2789 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2791 /* buf must be %d:%d\n? giving major and minor numbers */
2792 /* The new device is added to the array.
2793 * If the array has a persistent superblock, we read the
2794 * superblock to initialise info and check validity.
2795 * Otherwise, only checking done is that in bind_rdev_to_array,
2796 * which mainly checks size.
2799 int major = simple_strtoul(buf, &e, 10);
2805 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2807 minor = simple_strtoul(e+1, &e, 10);
2808 if (*e && *e != '\n')
2810 dev = MKDEV(major, minor);
2811 if (major != MAJOR(dev) ||
2812 minor != MINOR(dev))
2816 if (mddev->persistent) {
2817 rdev = md_import_device(dev, mddev->major_version,
2818 mddev->minor_version);
2819 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2820 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2821 mdk_rdev_t, same_set);
2822 err = super_types[mddev->major_version]
2823 .load_super(rdev, rdev0, mddev->minor_version);
2827 } else if (mddev->external)
2828 rdev = md_import_device(dev, -2, -1);
2830 rdev = md_import_device(dev, -1, -1);
2833 return PTR_ERR(rdev);
2834 err = bind_rdev_to_array(rdev, mddev);
2838 return err ? err : len;
2841 static struct md_sysfs_entry md_new_device =
2842 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2845 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2848 unsigned long chunk, end_chunk;
2852 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2854 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2855 if (buf == end) break;
2856 if (*end == '-') { /* range */
2858 end_chunk = simple_strtoul(buf, &end, 0);
2859 if (buf == end) break;
2861 if (*end && !isspace(*end)) break;
2862 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2864 while (isspace(*buf)) buf++;
2866 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2871 static struct md_sysfs_entry md_bitmap =
2872 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2875 size_show(mddev_t *mddev, char *page)
2877 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2880 static int update_size(mddev_t *mddev, sector_t num_sectors);
2883 size_store(mddev_t *mddev, const char *buf, size_t len)
2885 /* If array is inactive, we can reduce the component size, but
2886 * not increase it (except from 0).
2887 * If array is active, we can try an on-line resize
2891 unsigned long long size = simple_strtoull(buf, &e, 10);
2892 if (!*buf || *buf == '\n' ||
2897 err = update_size(mddev, size * 2);
2898 md_update_sb(mddev, 1);
2900 if (mddev->size == 0 ||
2906 return err ? err : len;
2909 static struct md_sysfs_entry md_size =
2910 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2915 * 'none' for arrays with no metadata (good luck...)
2916 * 'external' for arrays with externally managed metadata,
2917 * or N.M for internally known formats
2920 metadata_show(mddev_t *mddev, char *page)
2922 if (mddev->persistent)
2923 return sprintf(page, "%d.%d\n",
2924 mddev->major_version, mddev->minor_version);
2925 else if (mddev->external)
2926 return sprintf(page, "external:%s\n", mddev->metadata_type);
2928 return sprintf(page, "none\n");
2932 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2936 /* Changing the details of 'external' metadata is
2937 * always permitted. Otherwise there must be
2938 * no devices attached to the array.
2940 if (mddev->external && strncmp(buf, "external:", 9) == 0)
2942 else if (!list_empty(&mddev->disks))
2945 if (cmd_match(buf, "none")) {
2946 mddev->persistent = 0;
2947 mddev->external = 0;
2948 mddev->major_version = 0;
2949 mddev->minor_version = 90;
2952 if (strncmp(buf, "external:", 9) == 0) {
2953 size_t namelen = len-9;
2954 if (namelen >= sizeof(mddev->metadata_type))
2955 namelen = sizeof(mddev->metadata_type)-1;
2956 strncpy(mddev->metadata_type, buf+9, namelen);
2957 mddev->metadata_type[namelen] = 0;
2958 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2959 mddev->metadata_type[--namelen] = 0;
2960 mddev->persistent = 0;
2961 mddev->external = 1;
2962 mddev->major_version = 0;
2963 mddev->minor_version = 90;
2966 major = simple_strtoul(buf, &e, 10);
2967 if (e==buf || *e != '.')
2970 minor = simple_strtoul(buf, &e, 10);
2971 if (e==buf || (*e && *e != '\n') )
2973 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2975 mddev->major_version = major;
2976 mddev->minor_version = minor;
2977 mddev->persistent = 1;
2978 mddev->external = 0;
2982 static struct md_sysfs_entry md_metadata =
2983 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2986 action_show(mddev_t *mddev, char *page)
2988 char *type = "idle";
2989 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2990 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2991 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2993 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2994 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2996 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3000 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3003 return sprintf(page, "%s\n", type);
3007 action_store(mddev_t *mddev, const char *page, size_t len)
3009 if (!mddev->pers || !mddev->pers->sync_request)
3012 if (cmd_match(page, "idle")) {
3013 if (mddev->sync_thread) {
3014 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3015 md_unregister_thread(mddev->sync_thread);
3016 mddev->sync_thread = NULL;
3017 mddev->recovery = 0;
3019 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3020 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3022 else if (cmd_match(page, "resync"))
3023 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3024 else if (cmd_match(page, "recover")) {
3025 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3026 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3027 } else if (cmd_match(page, "reshape")) {
3029 if (mddev->pers->start_reshape == NULL)
3031 err = mddev->pers->start_reshape(mddev);
3034 sysfs_notify(&mddev->kobj, NULL, "degraded");
3036 if (cmd_match(page, "check"))
3037 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3038 else if (!cmd_match(page, "repair"))
3040 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3041 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3043 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3044 md_wakeup_thread(mddev->thread);
3045 sysfs_notify(&mddev->kobj, NULL, "sync_action");
3050 mismatch_cnt_show(mddev_t *mddev, char *page)
3052 return sprintf(page, "%llu\n",
3053 (unsigned long long) mddev->resync_mismatches);
3056 static struct md_sysfs_entry md_scan_mode =
3057 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3060 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3063 sync_min_show(mddev_t *mddev, char *page)
3065 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3066 mddev->sync_speed_min ? "local": "system");
3070 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3074 if (strncmp(buf, "system", 6)==0) {
3075 mddev->sync_speed_min = 0;
3078 min = simple_strtoul(buf, &e, 10);
3079 if (buf == e || (*e && *e != '\n') || min <= 0)
3081 mddev->sync_speed_min = min;
3085 static struct md_sysfs_entry md_sync_min =
3086 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3089 sync_max_show(mddev_t *mddev, char *page)
3091 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3092 mddev->sync_speed_max ? "local": "system");
3096 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3100 if (strncmp(buf, "system", 6)==0) {
3101 mddev->sync_speed_max = 0;
3104 max = simple_strtoul(buf, &e, 10);
3105 if (buf == e || (*e && *e != '\n') || max <= 0)
3107 mddev->sync_speed_max = max;
3111 static struct md_sysfs_entry md_sync_max =
3112 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3115 degraded_show(mddev_t *mddev, char *page)
3117 return sprintf(page, "%d\n", mddev->degraded);
3119 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3122 sync_force_parallel_show(mddev_t *mddev, char *page)
3124 return sprintf(page, "%d\n", mddev->parallel_resync);
3128 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3132 if (strict_strtol(buf, 10, &n))
3135 if (n != 0 && n != 1)
3138 mddev->parallel_resync = n;
3140 if (mddev->sync_thread)
3141 wake_up(&resync_wait);
3146 /* force parallel resync, even with shared block devices */
3147 static struct md_sysfs_entry md_sync_force_parallel =
3148 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3149 sync_force_parallel_show, sync_force_parallel_store);
3152 sync_speed_show(mddev_t *mddev, char *page)
3154 unsigned long resync, dt, db;
3155 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3156 dt = (jiffies - mddev->resync_mark) / HZ;
3158 db = resync - mddev->resync_mark_cnt;
3159 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3162 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3165 sync_completed_show(mddev_t *mddev, char *page)
3167 unsigned long max_blocks, resync;
3169 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3170 max_blocks = mddev->resync_max_sectors;
3172 max_blocks = mddev->size << 1;
3174 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3175 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3178 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3181 min_sync_show(mddev_t *mddev, char *page)
3183 return sprintf(page, "%llu\n",
3184 (unsigned long long)mddev->resync_min);
3187 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3189 unsigned long long min;
3190 if (strict_strtoull(buf, 10, &min))
3192 if (min > mddev->resync_max)
3194 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3197 /* Must be a multiple of chunk_size */
3198 if (mddev->chunk_size) {
3199 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3202 mddev->resync_min = min;
3207 static struct md_sysfs_entry md_min_sync =
3208 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3211 max_sync_show(mddev_t *mddev, char *page)
3213 if (mddev->resync_max == MaxSector)
3214 return sprintf(page, "max\n");
3216 return sprintf(page, "%llu\n",
3217 (unsigned long long)mddev->resync_max);
3220 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3222 if (strncmp(buf, "max", 3) == 0)
3223 mddev->resync_max = MaxSector;
3225 unsigned long long max;
3226 if (strict_strtoull(buf, 10, &max))
3228 if (max < mddev->resync_min)
3230 if (max < mddev->resync_max &&
3231 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3234 /* Must be a multiple of chunk_size */
3235 if (mddev->chunk_size) {
3236 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3239 mddev->resync_max = max;
3241 wake_up(&mddev->recovery_wait);
3245 static struct md_sysfs_entry md_max_sync =
3246 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3249 suspend_lo_show(mddev_t *mddev, char *page)
3251 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3255 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3258 unsigned long long new = simple_strtoull(buf, &e, 10);
3260 if (mddev->pers->quiesce == NULL)
3262 if (buf == e || (*e && *e != '\n'))
3264 if (new >= mddev->suspend_hi ||
3265 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3266 mddev->suspend_lo = new;
3267 mddev->pers->quiesce(mddev, 2);
3272 static struct md_sysfs_entry md_suspend_lo =
3273 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3277 suspend_hi_show(mddev_t *mddev, char *page)
3279 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3283 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3286 unsigned long long new = simple_strtoull(buf, &e, 10);
3288 if (mddev->pers->quiesce == NULL)
3290 if (buf == e || (*e && *e != '\n'))
3292 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3293 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3294 mddev->suspend_hi = new;
3295 mddev->pers->quiesce(mddev, 1);
3296 mddev->pers->quiesce(mddev, 0);
3301 static struct md_sysfs_entry md_suspend_hi =
3302 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3305 reshape_position_show(mddev_t *mddev, char *page)
3307 if (mddev->reshape_position != MaxSector)
3308 return sprintf(page, "%llu\n",
3309 (unsigned long long)mddev->reshape_position);
3310 strcpy(page, "none\n");
3315 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3318 unsigned long long new = simple_strtoull(buf, &e, 10);
3321 if (buf == e || (*e && *e != '\n'))
3323 mddev->reshape_position = new;
3324 mddev->delta_disks = 0;
3325 mddev->new_level = mddev->level;
3326 mddev->new_layout = mddev->layout;
3327 mddev->new_chunk = mddev->chunk_size;
3331 static struct md_sysfs_entry md_reshape_position =
3332 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3333 reshape_position_store);
3336 static struct attribute *md_default_attrs[] = {
3339 &md_raid_disks.attr,
3340 &md_chunk_size.attr,
3342 &md_resync_start.attr,
3344 &md_new_device.attr,
3345 &md_safe_delay.attr,
3346 &md_array_state.attr,
3347 &md_reshape_position.attr,
3351 static struct attribute *md_redundancy_attrs[] = {
3353 &md_mismatches.attr,
3356 &md_sync_speed.attr,
3357 &md_sync_force_parallel.attr,
3358 &md_sync_completed.attr,
3361 &md_suspend_lo.attr,
3362 &md_suspend_hi.attr,
3367 static struct attribute_group md_redundancy_group = {
3369 .attrs = md_redundancy_attrs,
3374 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3376 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3377 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3382 rv = mddev_lock(mddev);
3384 rv = entry->show(mddev, page);
3385 mddev_unlock(mddev);
3391 md_attr_store(struct kobject *kobj, struct attribute *attr,
3392 const char *page, size_t length)
3394 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3395 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3400 if (!capable(CAP_SYS_ADMIN))
3402 rv = mddev_lock(mddev);
3404 rv = entry->store(mddev, page, length);
3405 mddev_unlock(mddev);
3410 static void md_free(struct kobject *ko)
3412 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3416 static struct sysfs_ops md_sysfs_ops = {
3417 .show = md_attr_show,
3418 .store = md_attr_store,
3420 static struct kobj_type md_ktype = {
3422 .sysfs_ops = &md_sysfs_ops,
3423 .default_attrs = md_default_attrs,
3428 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3430 static DEFINE_MUTEX(disks_mutex);
3431 mddev_t *mddev = mddev_find(dev);
3432 struct gendisk *disk;
3433 int partitioned = (MAJOR(dev) != MD_MAJOR);
3434 int shift = partitioned ? MdpMinorShift : 0;
3435 int unit = MINOR(dev) >> shift;
3441 mutex_lock(&disks_mutex);
3442 if (mddev->gendisk) {
3443 mutex_unlock(&disks_mutex);
3447 disk = alloc_disk(1 << shift);
3449 mutex_unlock(&disks_mutex);
3453 disk->major = MAJOR(dev);
3454 disk->first_minor = unit << shift;
3456 sprintf(disk->disk_name, "md_d%d", unit);
3458 sprintf(disk->disk_name, "md%d", unit);
3459 disk->fops = &md_fops;
3460 disk->private_data = mddev;
3461 disk->queue = mddev->queue;
3463 mddev->gendisk = disk;
3464 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3465 &disk_to_dev(disk)->kobj, "%s", "md");
3466 mutex_unlock(&disks_mutex);
3468 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3471 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3475 static void md_safemode_timeout(unsigned long data)
3477 mddev_t *mddev = (mddev_t *) data;
3479 if (!atomic_read(&mddev->writes_pending)) {
3480 mddev->safemode = 1;
3481 if (mddev->external)
3482 set_bit(MD_NOTIFY_ARRAY_STATE, &mddev->flags);
3484 md_wakeup_thread(mddev->thread);
3487 static int start_dirty_degraded;
3489 static int do_md_run(mddev_t * mddev)
3493 struct list_head *tmp;
3495 struct gendisk *disk;
3496 struct mdk_personality *pers;
3497 char b[BDEVNAME_SIZE];
3499 if (list_empty(&mddev->disks))
3500 /* cannot run an array with no devices.. */
3507 * Analyze all RAID superblock(s)
3509 if (!mddev->raid_disks) {
3510 if (!mddev->persistent)
3515 chunk_size = mddev->chunk_size;
3518 if (chunk_size > MAX_CHUNK_SIZE) {
3519 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3520 chunk_size, MAX_CHUNK_SIZE);
3524 * chunk-size has to be a power of 2
3526 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3527 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3531 /* devices must have minimum size of one chunk */
3532 rdev_for_each(rdev, tmp, mddev) {
3533 if (test_bit(Faulty, &rdev->flags))
3535 if (rdev->size < chunk_size / 1024) {
3537 "md: Dev %s smaller than chunk_size:"
3539 bdevname(rdev->bdev,b),
3540 (unsigned long long)rdev->size,
3547 if (mddev->level != LEVEL_NONE)
3548 request_module("md-level-%d", mddev->level);
3549 else if (mddev->clevel[0])
3550 request_module("md-%s", mddev->clevel);
3553 * Drop all container device buffers, from now on
3554 * the only valid external interface is through the md
3557 rdev_for_each(rdev, tmp, mddev) {
3558 if (test_bit(Faulty, &rdev->flags))
3560 sync_blockdev(rdev->bdev);
3561 invalidate_bdev(rdev->bdev);
3563 /* perform some consistency tests on the device.
3564 * We don't want the data to overlap the metadata,
3565 * Internal Bitmap issues has handled elsewhere.
3567 if (rdev->data_offset < rdev->sb_start) {
3569 rdev->data_offset + mddev->size*2
3571 printk("md: %s: data overlaps metadata\n",
3576 if (rdev->sb_start + rdev->sb_size/512
3577 > rdev->data_offset) {
3578 printk("md: %s: metadata overlaps data\n",
3583 sysfs_notify(&rdev->kobj, NULL, "state");
3586 md_probe(mddev->unit, NULL, NULL);
3587 disk = mddev->gendisk;
3591 spin_lock(&pers_lock);
3592 pers = find_pers(mddev->level, mddev->clevel);
3593 if (!pers || !try_module_get(pers->owner)) {
3594 spin_unlock(&pers_lock);
3595 if (mddev->level != LEVEL_NONE)
3596 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3599 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3604 spin_unlock(&pers_lock);
3605 mddev->level = pers->level;
3606 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3608 if (mddev->reshape_position != MaxSector &&
3609 pers->start_reshape == NULL) {
3610 /* This personality cannot handle reshaping... */
3612 module_put(pers->owner);
3616 if (pers->sync_request) {
3617 /* Warn if this is a potentially silly
3620 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3622 struct list_head *tmp2;
3624 rdev_for_each(rdev, tmp, mddev) {
3625 rdev_for_each(rdev2, tmp2, mddev) {
3627 rdev->bdev->bd_contains ==
3628 rdev2->bdev->bd_contains) {
3630 "%s: WARNING: %s appears to be"
3631 " on the same physical disk as"
3634 bdevname(rdev->bdev,b),
3635 bdevname(rdev2->bdev,b2));
3642 "True protection against single-disk"
3643 " failure might be compromised.\n");
3646 mddev->recovery = 0;
3647 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3648 mddev->barriers_work = 1;
3649 mddev->ok_start_degraded = start_dirty_degraded;
3652 mddev->ro = 2; /* read-only, but switch on first write */
3654 err = mddev->pers->run(mddev);
3656 printk(KERN_ERR "md: pers->run() failed ...\n");
3657 else if (mddev->pers->sync_request) {
3658 err = bitmap_create(mddev);
3660 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3661 mdname(mddev), err);
3662 mddev->pers->stop(mddev);
3666 module_put(mddev->pers->owner);
3668 bitmap_destroy(mddev);
3671 if (mddev->pers->sync_request) {
3672 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3674 "md: cannot register extra attributes for %s\n",
3676 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3679 atomic_set(&mddev->writes_pending,0);
3680 mddev->safemode = 0;
3681 mddev->safemode_timer.function = md_safemode_timeout;
3682 mddev->safemode_timer.data = (unsigned long) mddev;
3683 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3686 rdev_for_each(rdev, tmp, mddev)
3687 if (rdev->raid_disk >= 0) {
3689 sprintf(nm, "rd%d", rdev->raid_disk);
3690 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3691 printk("md: cannot register %s for %s\n",
3695 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3698 md_update_sb(mddev, 0);
3700 set_capacity(disk, mddev->array_sectors);
3702 /* If we call blk_queue_make_request here, it will
3703 * re-initialise max_sectors etc which may have been
3704 * refined inside -> run. So just set the bits we need to set.
3705 * Most initialisation happended when we called
3706 * blk_queue_make_request(..., md_fail_request)
3709 mddev->queue->queuedata = mddev;
3710 mddev->queue->make_request_fn = mddev->pers->make_request;
3712 /* If there is a partially-recovered drive we need to
3713 * start recovery here. If we leave it to md_check_recovery,
3714 * it will remove the drives and not do the right thing
3716 if (mddev->degraded && !mddev->sync_thread) {
3717 struct list_head *rtmp;
3719 rdev_for_each(rdev, rtmp, mddev)
3720 if (rdev->raid_disk >= 0 &&
3721 !test_bit(In_sync, &rdev->flags) &&
3722 !test_bit(Faulty, &rdev->flags))
3723 /* complete an interrupted recovery */
3725 if (spares && mddev->pers->sync_request) {
3726 mddev->recovery = 0;
3727 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3728 mddev->sync_thread = md_register_thread(md_do_sync,
3731 if (!mddev->sync_thread) {
3732 printk(KERN_ERR "%s: could not start resync"
3735 /* leave the spares where they are, it shouldn't hurt */
3736 mddev->recovery = 0;
3740 md_wakeup_thread(mddev->thread);
3741 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3744 md_new_event(mddev);
3745 sysfs_notify(&mddev->kobj, NULL, "array_state");
3746 sysfs_notify(&mddev->kobj, NULL, "sync_action");
3747 sysfs_notify(&mddev->kobj, NULL, "degraded");
3748 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
3752 static int restart_array(mddev_t *mddev)
3754 struct gendisk *disk = mddev->gendisk;
3756 /* Complain if it has no devices */
3757 if (list_empty(&mddev->disks))
3763 mddev->safemode = 0;
3765 set_disk_ro(disk, 0);
3766 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3768 /* Kick recovery or resync if necessary */
3769 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3770 md_wakeup_thread(mddev->thread);
3771 md_wakeup_thread(mddev->sync_thread);
3772 sysfs_notify(&mddev->kobj, NULL, "array_state");
3776 /* similar to deny_write_access, but accounts for our holding a reference
3777 * to the file ourselves */
3778 static int deny_bitmap_write_access(struct file * file)
3780 struct inode *inode = file->f_mapping->host;
3782 spin_lock(&inode->i_lock);
3783 if (atomic_read(&inode->i_writecount) > 1) {
3784 spin_unlock(&inode->i_lock);
3787 atomic_set(&inode->i_writecount, -1);
3788 spin_unlock(&inode->i_lock);
3793 static void restore_bitmap_write_access(struct file *file)
3795 struct inode *inode = file->f_mapping->host;
3797 spin_lock(&inode->i_lock);
3798 atomic_set(&inode->i_writecount, 1);
3799 spin_unlock(&inode->i_lock);
3803 * 0 - completely stop and dis-assemble array
3804 * 1 - switch to readonly
3805 * 2 - stop but do not disassemble array
3807 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
3810 struct gendisk *disk = mddev->gendisk;
3812 if (atomic_read(&mddev->openers) > is_open) {
3813 printk("md: %s still in use.\n",mdname(mddev));
3819 if (mddev->sync_thread) {
3820 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3821 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3822 md_unregister_thread(mddev->sync_thread);
3823 mddev->sync_thread = NULL;
3826 del_timer_sync(&mddev->safemode_timer);
3829 case 1: /* readonly */
3835 case 0: /* disassemble */
3837 bitmap_flush(mddev);
3838 md_super_wait(mddev);
3840 set_disk_ro(disk, 0);
3841 blk_queue_make_request(mddev->queue, md_fail_request);
3842 mddev->pers->stop(mddev);
3843 mddev->queue->merge_bvec_fn = NULL;
3844 mddev->queue->unplug_fn = NULL;
3845 mddev->queue->backing_dev_info.congested_fn = NULL;
3846 if (mddev->pers->sync_request)
3847 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3849 module_put(mddev->pers->owner);
3851 /* tell userspace to handle 'inactive' */
3852 sysfs_notify(&mddev->kobj, NULL, "array_state");
3854 set_capacity(disk, 0);
3860 if (!mddev->in_sync || mddev->flags) {
3861 /* mark array as shutdown cleanly */
3863 md_update_sb(mddev, 1);
3866 set_disk_ro(disk, 1);
3867 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3871 * Free resources if final stop
3875 struct list_head *tmp;
3877 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3879 bitmap_destroy(mddev);
3880 if (mddev->bitmap_file) {
3881 restore_bitmap_write_access(mddev->bitmap_file);
3882 fput(mddev->bitmap_file);
3883 mddev->bitmap_file = NULL;
3885 mddev->bitmap_offset = 0;
3887 rdev_for_each(rdev, tmp, mddev)
3888 if (rdev->raid_disk >= 0) {
3890 sprintf(nm, "rd%d", rdev->raid_disk);
3891 sysfs_remove_link(&mddev->kobj, nm);
3894 /* make sure all md_delayed_delete calls have finished */
3895 flush_scheduled_work();
3897 export_array(mddev);
3899 mddev->array_sectors = 0;
3901 mddev->raid_disks = 0;
3902 mddev->recovery_cp = 0;
3903 mddev->resync_min = 0;
3904 mddev->resync_max = MaxSector;
3905 mddev->reshape_position = MaxSector;
3906 mddev->external = 0;
3907 mddev->persistent = 0;
3908 mddev->level = LEVEL_NONE;
3909 mddev->clevel[0] = 0;
3912 mddev->metadata_type[0] = 0;
3913 mddev->chunk_size = 0;
3914 mddev->ctime = mddev->utime = 0;
3916 mddev->max_disks = 0;
3918 mddev->delta_disks = 0;
3919 mddev->new_level = LEVEL_NONE;
3920 mddev->new_layout = 0;
3921 mddev->new_chunk = 0;
3922 mddev->curr_resync = 0;
3923 mddev->resync_mismatches = 0;
3924 mddev->suspend_lo = mddev->suspend_hi = 0;
3925 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3926 mddev->recovery = 0;
3929 mddev->degraded = 0;
3930 mddev->barriers_work = 0;
3931 mddev->safemode = 0;
3933 } else if (mddev->pers)
3934 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3937 md_new_event(mddev);
3938 sysfs_notify(&mddev->kobj, NULL, "array_state");
3944 static void autorun_array(mddev_t *mddev)
3947 struct list_head *tmp;
3950 if (list_empty(&mddev->disks))
3953 printk(KERN_INFO "md: running: ");
3955 rdev_for_each(rdev, tmp, mddev) {
3956 char b[BDEVNAME_SIZE];
3957 printk("<%s>", bdevname(rdev->bdev,b));
3961 err = do_md_run(mddev);
3963 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3964 do_md_stop(mddev, 0, 0);
3969 * lets try to run arrays based on all disks that have arrived
3970 * until now. (those are in pending_raid_disks)
3972 * the method: pick the first pending disk, collect all disks with
3973 * the same UUID, remove all from the pending list and put them into
3974 * the 'same_array' list. Then order this list based on superblock
3975 * update time (freshest comes first), kick out 'old' disks and
3976 * compare superblocks. If everything's fine then run it.
3978 * If "unit" is allocated, then bump its reference count
3980 static void autorun_devices(int part)
3982 struct list_head *tmp;
3983 mdk_rdev_t *rdev0, *rdev;
3985 char b[BDEVNAME_SIZE];
3987 printk(KERN_INFO "md: autorun ...\n");
3988 while (!list_empty(&pending_raid_disks)) {
3991 LIST_HEAD(candidates);
3992 rdev0 = list_entry(pending_raid_disks.next,
3993 mdk_rdev_t, same_set);
3995 printk(KERN_INFO "md: considering %s ...\n",
3996 bdevname(rdev0->bdev,b));
3997 INIT_LIST_HEAD(&candidates);
3998 rdev_for_each_list(rdev, tmp, pending_raid_disks)
3999 if (super_90_load(rdev, rdev0, 0) >= 0) {
4000 printk(KERN_INFO "md: adding %s ...\n",
4001 bdevname(rdev->bdev,b));
4002 list_move(&rdev->same_set, &candidates);
4005 * now we have a set of devices, with all of them having
4006 * mostly sane superblocks. It's time to allocate the
4010 dev = MKDEV(mdp_major,
4011 rdev0->preferred_minor << MdpMinorShift);
4012 unit = MINOR(dev) >> MdpMinorShift;
4014 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4017 if (rdev0->preferred_minor != unit) {
4018 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4019 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4023 md_probe(dev, NULL, NULL);
4024 mddev = mddev_find(dev);
4025 if (!mddev || !mddev->gendisk) {
4029 "md: cannot allocate memory for md drive.\n");
4032 if (mddev_lock(mddev))
4033 printk(KERN_WARNING "md: %s locked, cannot run\n",
4035 else if (mddev->raid_disks || mddev->major_version
4036 || !list_empty(&mddev->disks)) {
4038 "md: %s already running, cannot run %s\n",
4039 mdname(mddev), bdevname(rdev0->bdev,b));
4040 mddev_unlock(mddev);
4042 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4043 mddev->persistent = 1;
4044 rdev_for_each_list(rdev, tmp, candidates) {
4045 list_del_init(&rdev->same_set);
4046 if (bind_rdev_to_array(rdev, mddev))
4049 autorun_array(mddev);
4050 mddev_unlock(mddev);
4052 /* on success, candidates will be empty, on error
4055 rdev_for_each_list(rdev, tmp, candidates) {
4056 list_del_init(&rdev->same_set);
4061 printk(KERN_INFO "md: ... autorun DONE.\n");
4063 #endif /* !MODULE */
4065 static int get_version(void __user * arg)
4069 ver.major = MD_MAJOR_VERSION;
4070 ver.minor = MD_MINOR_VERSION;
4071 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4073 if (copy_to_user(arg, &ver, sizeof(ver)))
4079 static int get_array_info(mddev_t * mddev, void __user * arg)
4081 mdu_array_info_t info;
4082 int nr,working,active,failed,spare;
4084 struct list_head *tmp;
4086 nr=working=active=failed=spare=0;
4087 rdev_for_each(rdev, tmp, mddev) {
4089 if (test_bit(Faulty, &rdev->flags))
4093 if (test_bit(In_sync, &rdev->flags))
4100 info.major_version = mddev->major_version;
4101 info.minor_version = mddev->minor_version;
4102 info.patch_version = MD_PATCHLEVEL_VERSION;
4103 info.ctime = mddev->ctime;
4104 info.level = mddev->level;
4105 info.size = mddev->size;
4106 if (info.size != mddev->size) /* overflow */
4109 info.raid_disks = mddev->raid_disks;
4110 info.md_minor = mddev->md_minor;
4111 info.not_persistent= !mddev->persistent;
4113 info.utime = mddev->utime;
4116 info.state = (1<<MD_SB_CLEAN);
4117 if (mddev->bitmap && mddev->bitmap_offset)
4118 info.state = (1<<MD_SB_BITMAP_PRESENT);
4119 info.active_disks = active;
4120 info.working_disks = working;
4121 info.failed_disks = failed;
4122 info.spare_disks = spare;
4124 info.layout = mddev->layout;
4125 info.chunk_size = mddev->chunk_size;
4127 if (copy_to_user(arg, &info, sizeof(info)))
4133 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4135 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4136 char *ptr, *buf = NULL;
4139 if (md_allow_write(mddev))
4140 file = kmalloc(sizeof(*file), GFP_NOIO);
4142 file = kmalloc(sizeof(*file), GFP_KERNEL);
4147 /* bitmap disabled, zero the first byte and copy out */
4148 if (!mddev->bitmap || !mddev->bitmap->file) {
4149 file->pathname[0] = '\0';
4153 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4157 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4161 strcpy(file->pathname, ptr);
4165 if (copy_to_user(arg, file, sizeof(*file)))
4173 static int get_disk_info(mddev_t * mddev, void __user * arg)
4175 mdu_disk_info_t info;
4178 if (copy_from_user(&info, arg, sizeof(info)))
4181 rdev = find_rdev_nr(mddev, info.number);
4183 info.major = MAJOR(rdev->bdev->bd_dev);
4184 info.minor = MINOR(rdev->bdev->bd_dev);
4185 info.raid_disk = rdev->raid_disk;
4187 if (test_bit(Faulty, &rdev->flags))
4188 info.state |= (1<<MD_DISK_FAULTY);
4189 else if (test_bit(In_sync, &rdev->flags)) {
4190 info.state |= (1<<MD_DISK_ACTIVE);
4191 info.state |= (1<<MD_DISK_SYNC);
4193 if (test_bit(WriteMostly, &rdev->flags))
4194 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4196 info.major = info.minor = 0;
4197 info.raid_disk = -1;
4198 info.state = (1<<MD_DISK_REMOVED);
4201 if (copy_to_user(arg, &info, sizeof(info)))
4207 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4209 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4211 dev_t dev = MKDEV(info->major,info->minor);
4213 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4216 if (!mddev->raid_disks) {
4218 /* expecting a device which has a superblock */
4219 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4222 "md: md_import_device returned %ld\n",
4224 return PTR_ERR(rdev);
4226 if (!list_empty(&mddev->disks)) {
4227 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4228 mdk_rdev_t, same_set);
4229 int err = super_types[mddev->major_version]
4230 .load_super(rdev, rdev0, mddev->minor_version);
4233 "md: %s has different UUID to %s\n",
4234 bdevname(rdev->bdev,b),
4235 bdevname(rdev0->bdev,b2));
4240 err = bind_rdev_to_array(rdev, mddev);
4247 * add_new_disk can be used once the array is assembled
4248 * to add "hot spares". They must already have a superblock
4253 if (!mddev->pers->hot_add_disk) {
4255 "%s: personality does not support diskops!\n",
4259 if (mddev->persistent)
4260 rdev = md_import_device(dev, mddev->major_version,
4261 mddev->minor_version);
4263 rdev = md_import_device(dev, -1, -1);
4266 "md: md_import_device returned %ld\n",
4268 return PTR_ERR(rdev);
4270 /* set save_raid_disk if appropriate */
4271 if (!mddev->persistent) {
4272 if (info->state & (1<<MD_DISK_SYNC) &&
4273 info->raid_disk < mddev->raid_disks)
4274 rdev->raid_disk = info->raid_disk;
4276 rdev->raid_disk = -1;
4278 super_types[mddev->major_version].
4279 validate_super(mddev, rdev);
4280 rdev->saved_raid_disk = rdev->raid_disk;
4282 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4283 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4284 set_bit(WriteMostly, &rdev->flags);
4286 rdev->raid_disk = -1;
4287 err = bind_rdev_to_array(rdev, mddev);
4288 if (!err && !mddev->pers->hot_remove_disk) {
4289 /* If there is hot_add_disk but no hot_remove_disk
4290 * then added disks for geometry changes,
4291 * and should be added immediately.
4293 super_types[mddev->major_version].
4294 validate_super(mddev, rdev);
4295 err = mddev->pers->hot_add_disk(mddev, rdev);
4297 unbind_rdev_from_array(rdev);
4302 sysfs_notify(&rdev->kobj, NULL, "state");
4304 md_update_sb(mddev, 1);
4305 if (mddev->degraded)
4306 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4307 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4308 md_wakeup_thread(mddev->thread);
4312 /* otherwise, add_new_disk is only allowed
4313 * for major_version==0 superblocks
4315 if (mddev->major_version != 0) {
4316 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4321 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4323 rdev = md_import_device(dev, -1, 0);
4326 "md: error, md_import_device() returned %ld\n",
4328 return PTR_ERR(rdev);
4330 rdev->desc_nr = info->number;
4331 if (info->raid_disk < mddev->raid_disks)
4332 rdev->raid_disk = info->raid_disk;
4334 rdev->raid_disk = -1;
4336 if (rdev->raid_disk < mddev->raid_disks)
4337 if (info->state & (1<<MD_DISK_SYNC))
4338 set_bit(In_sync, &rdev->flags);
4340 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4341 set_bit(WriteMostly, &rdev->flags);
4343 if (!mddev->persistent) {
4344 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4345 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4347 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4348 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4350 err = bind_rdev_to_array(rdev, mddev);
4360 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4362 char b[BDEVNAME_SIZE];
4365 rdev = find_rdev(mddev, dev);
4369 if (rdev->raid_disk >= 0)
4372 kick_rdev_from_array(rdev);
4373 md_update_sb(mddev, 1);
4374 md_new_event(mddev);
4378 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4379 bdevname(rdev->bdev,b), mdname(mddev));
4383 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4385 char b[BDEVNAME_SIZE];
4392 if (mddev->major_version != 0) {
4393 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4394 " version-0 superblocks.\n",
4398 if (!mddev->pers->hot_add_disk) {
4400 "%s: personality does not support diskops!\n",
4405 rdev = md_import_device(dev, -1, 0);
4408 "md: error, md_import_device() returned %ld\n",
4413 if (mddev->persistent)
4414 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4416 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4418 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4420 if (test_bit(Faulty, &rdev->flags)) {
4422 "md: can not hot-add faulty %s disk to %s!\n",
4423 bdevname(rdev->bdev,b), mdname(mddev));
4427 clear_bit(In_sync, &rdev->flags);
4429 rdev->saved_raid_disk = -1;
4430 err = bind_rdev_to_array(rdev, mddev);
4435 * The rest should better be atomic, we can have disk failures
4436 * noticed in interrupt contexts ...
4439 if (rdev->desc_nr == mddev->max_disks) {
4440 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4443 goto abort_unbind_export;
4446 rdev->raid_disk = -1;
4448 md_update_sb(mddev, 1);
4451 * Kick recovery, maybe this spare has to be added to the
4452 * array immediately.
4454 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4455 md_wakeup_thread(mddev->thread);
4456 md_new_event(mddev);
4459 abort_unbind_export:
4460 unbind_rdev_from_array(rdev);
4467 static int set_bitmap_file(mddev_t *mddev, int fd)
4472 if (!mddev->pers->quiesce)
4474 if (mddev->recovery || mddev->sync_thread)
4476 /* we should be able to change the bitmap.. */
4482 return -EEXIST; /* cannot add when bitmap is present */
4483 mddev->bitmap_file = fget(fd);
4485 if (mddev->bitmap_file == NULL) {
4486 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4491 err = deny_bitmap_write_access(mddev->bitmap_file);
4493 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4495 fput(mddev->bitmap_file);
4496 mddev->bitmap_file = NULL;
4499 mddev->bitmap_offset = 0; /* file overrides offset */
4500 } else if (mddev->bitmap == NULL)
4501 return -ENOENT; /* cannot remove what isn't there */
4504 mddev->pers->quiesce(mddev, 1);
4506 err = bitmap_create(mddev);
4507 if (fd < 0 || err) {
4508 bitmap_destroy(mddev);
4509 fd = -1; /* make sure to put the file */
4511 mddev->pers->quiesce(mddev, 0);
4514 if (mddev->bitmap_file) {
4515 restore_bitmap_write_access(mddev->bitmap_file);
4516 fput(mddev->bitmap_file);
4518 mddev->bitmap_file = NULL;
4525 * set_array_info is used two different ways
4526 * The original usage is when creating a new array.
4527 * In this usage, raid_disks is > 0 and it together with
4528 * level, size, not_persistent,layout,chunksize determine the
4529 * shape of the array.
4530 * This will always create an array with a type-0.90.0 superblock.
4531 * The newer usage is when assembling an array.
4532 * In this case raid_disks will be 0, and the major_version field is
4533 * use to determine which style super-blocks are to be found on the devices.
4534 * The minor and patch _version numbers are also kept incase the
4535 * super_block handler wishes to interpret them.
4537 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4540 if (info->raid_disks == 0) {
4541 /* just setting version number for superblock loading */
4542 if (info->major_version < 0 ||
4543 info->major_version >= ARRAY_SIZE(super_types) ||
4544 super_types[info->major_version].name == NULL) {
4545 /* maybe try to auto-load a module? */
4547 "md: superblock version %d not known\n",
4548 info->major_version);
4551 mddev->major_version = info->major_version;
4552 mddev->minor_version = info->minor_version;
4553 mddev->patch_version = info->patch_version;
4554 mddev->persistent = !info->not_persistent;
4557 mddev->major_version = MD_MAJOR_VERSION;
4558 mddev->minor_version = MD_MINOR_VERSION;
4559 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4560 mddev->ctime = get_seconds();
4562 mddev->level = info->level;
4563 mddev->clevel[0] = 0;
4564 mddev->size = info->size;
4565 mddev->raid_disks = info->raid_disks;
4566 /* don't set md_minor, it is determined by which /dev/md* was
4569 if (info->state & (1<<MD_SB_CLEAN))
4570 mddev->recovery_cp = MaxSector;
4572 mddev->recovery_cp = 0;
4573 mddev->persistent = ! info->not_persistent;
4574 mddev->external = 0;
4576 mddev->layout = info->layout;
4577 mddev->chunk_size = info->chunk_size;
4579 mddev->max_disks = MD_SB_DISKS;
4581 if (mddev->persistent)
4583 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4585 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4586 mddev->bitmap_offset = 0;
4588 mddev->reshape_position = MaxSector;
4591 * Generate a 128 bit UUID
4593 get_random_bytes(mddev->uuid, 16);
4595 mddev->new_level = mddev->level;
4596 mddev->new_chunk = mddev->chunk_size;
4597 mddev->new_layout = mddev->layout;
4598 mddev->delta_disks = 0;
4603 static int update_size(mddev_t *mddev, sector_t num_sectors)
4607 struct list_head *tmp;
4608 int fit = (num_sectors == 0);
4610 if (mddev->pers->resize == NULL)
4612 /* The "num_sectors" is the number of sectors of each device that
4613 * is used. This can only make sense for arrays with redundancy.
4614 * linear and raid0 always use whatever space is available. We can only
4615 * consider changing this number if no resync or reconstruction is
4616 * happening, and if the new size is acceptable. It must fit before the
4617 * sb_start or, if that is <data_offset, it must fit before the size
4618 * of each device. If num_sectors is zero, we find the largest size
4622 if (mddev->sync_thread)
4625 /* Sorry, cannot grow a bitmap yet, just remove it,
4629 rdev_for_each(rdev, tmp, mddev) {
4631 avail = rdev->size * 2;
4633 if (fit && (num_sectors == 0 || num_sectors > avail))
4634 num_sectors = avail;
4635 if (avail < num_sectors)
4638 rv = mddev->pers->resize(mddev, num_sectors);
4640 struct block_device *bdev;
4642 bdev = bdget_disk(mddev->gendisk, 0);
4644 mutex_lock(&bdev->bd_inode->i_mutex);
4645 i_size_write(bdev->bd_inode,
4646 (loff_t)mddev->array_sectors << 9);
4647 mutex_unlock(&bdev->bd_inode->i_mutex);
4654 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4657 /* change the number of raid disks */
4658 if (mddev->pers->check_reshape == NULL)
4660 if (raid_disks <= 0 ||
4661 raid_disks >= mddev->max_disks)
4663 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4665 mddev->delta_disks = raid_disks - mddev->raid_disks;
4667 rv = mddev->pers->check_reshape(mddev);
4673 * update_array_info is used to change the configuration of an
4675 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4676 * fields in the info are checked against the array.
4677 * Any differences that cannot be handled will cause an error.
4678 * Normally, only one change can be managed at a time.
4680 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4686 /* calculate expected state,ignoring low bits */
4687 if (mddev->bitmap && mddev->bitmap_offset)
4688 state |= (1 << MD_SB_BITMAP_PRESENT);
4690 if (mddev->major_version != info->major_version ||
4691 mddev->minor_version != info->minor_version ||
4692 /* mddev->patch_version != info->patch_version || */
4693 mddev->ctime != info->ctime ||
4694 mddev->level != info->level ||
4695 /* mddev->layout != info->layout || */
4696 !mddev->persistent != info->not_persistent||
4697 mddev->chunk_size != info->chunk_size ||
4698 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4699 ((state^info->state) & 0xfffffe00)
4702 /* Check there is only one change */
4703 if (info->size >= 0 && mddev->size != info->size) cnt++;
4704 if (mddev->raid_disks != info->raid_disks) cnt++;
4705 if (mddev->layout != info->layout) cnt++;
4706 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4707 if (cnt == 0) return 0;
4708 if (cnt > 1) return -EINVAL;
4710 if (mddev->layout != info->layout) {
4712 * we don't need to do anything at the md level, the
4713 * personality will take care of it all.
4715 if (mddev->pers->reconfig == NULL)
4718 return mddev->pers->reconfig(mddev, info->layout, -1);
4720 if (info->size >= 0 && mddev->size != info->size)
4721 rv = update_size(mddev, (sector_t)info->size * 2);
4723 if (mddev->raid_disks != info->raid_disks)
4724 rv = update_raid_disks(mddev, info->raid_disks);
4726 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4727 if (mddev->pers->quiesce == NULL)
4729 if (mddev->recovery || mddev->sync_thread)
4731 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4732 /* add the bitmap */
4735 if (mddev->default_bitmap_offset == 0)
4737 mddev->bitmap_offset = mddev->default_bitmap_offset;
4738 mddev->pers->quiesce(mddev, 1);
4739 rv = bitmap_create(mddev);
4741 bitmap_destroy(mddev);
4742 mddev->pers->quiesce(mddev, 0);
4744 /* remove the bitmap */
4747 if (mddev->bitmap->file)
4749 mddev->pers->quiesce(mddev, 1);
4750 bitmap_destroy(mddev);
4751 mddev->pers->quiesce(mddev, 0);
4752 mddev->bitmap_offset = 0;
4755 md_update_sb(mddev, 1);
4759 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4763 if (mddev->pers == NULL)
4766 rdev = find_rdev(mddev, dev);
4770 md_error(mddev, rdev);
4775 * We have a problem here : there is no easy way to give a CHS
4776 * virtual geometry. We currently pretend that we have a 2 heads
4777 * 4 sectors (with a BIG number of cylinders...). This drives
4778 * dosfs just mad... ;-)
4780 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4782 mddev_t *mddev = bdev->bd_disk->private_data;
4786 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4790 static int md_ioctl(struct inode *inode, struct file *file,
4791 unsigned int cmd, unsigned long arg)
4794 void __user *argp = (void __user *)arg;
4795 mddev_t *mddev = NULL;
4797 if (!capable(CAP_SYS_ADMIN))
4801 * Commands dealing with the RAID driver but not any
4807 err = get_version(argp);
4810 case PRINT_RAID_DEBUG:
4818 autostart_arrays(arg);
4825 * Commands creating/starting a new array:
4828 mddev = inode->i_bdev->bd_disk->private_data;
4835 err = mddev_lock(mddev);
4838 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4845 case SET_ARRAY_INFO:
4847 mdu_array_info_t info;
4849 memset(&info, 0, sizeof(info));
4850 else if (copy_from_user(&info, argp, sizeof(info))) {
4855 err = update_array_info(mddev, &info);
4857 printk(KERN_WARNING "md: couldn't update"
4858 " array info. %d\n", err);
4863 if (!list_empty(&mddev->disks)) {
4865 "md: array %s already has disks!\n",
4870 if (mddev->raid_disks) {
4872 "md: array %s already initialised!\n",
4877 err = set_array_info(mddev, &info);
4879 printk(KERN_WARNING "md: couldn't set"
4880 " array info. %d\n", err);
4890 * Commands querying/configuring an existing array:
4892 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4893 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4894 if ((!mddev->raid_disks && !mddev->external)
4895 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4896 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4897 && cmd != GET_BITMAP_FILE) {
4903 * Commands even a read-only array can execute:
4907 case GET_ARRAY_INFO:
4908 err = get_array_info(mddev, argp);
4911 case GET_BITMAP_FILE:
4912 err = get_bitmap_file(mddev, argp);
4916 err = get_disk_info(mddev, argp);
4919 case RESTART_ARRAY_RW:
4920 err = restart_array(mddev);
4924 err = do_md_stop(mddev, 0, 1);
4928 err = do_md_stop(mddev, 1, 1);
4934 * The remaining ioctls are changing the state of the
4935 * superblock, so we do not allow them on read-only arrays.
4936 * However non-MD ioctls (e.g. get-size) will still come through
4937 * here and hit the 'default' below, so only disallow
4938 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4940 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
4941 if (mddev->ro == 2) {
4943 sysfs_notify(&mddev->kobj, NULL, "array_state");
4944 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4945 md_wakeup_thread(mddev->thread);
4956 mdu_disk_info_t info;
4957 if (copy_from_user(&info, argp, sizeof(info)))
4960 err = add_new_disk(mddev, &info);
4964 case HOT_REMOVE_DISK:
4965 err = hot_remove_disk(mddev, new_decode_dev(arg));
4969 err = hot_add_disk(mddev, new_decode_dev(arg));
4972 case SET_DISK_FAULTY:
4973 err = set_disk_faulty(mddev, new_decode_dev(arg));
4977 err = do_md_run(mddev);
4980 case SET_BITMAP_FILE:
4981 err = set_bitmap_file(mddev, (int)arg);
4991 mddev_unlock(mddev);
5001 static int md_open(struct inode *inode, struct file *file)
5004 * Succeed if we can lock the mddev, which confirms that
5005 * it isn't being stopped right now.
5007 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
5010 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5015 atomic_inc(&mddev->openers);
5016 mddev_unlock(mddev);
5018 check_disk_change(inode->i_bdev);
5023 static int md_release(struct inode *inode, struct file * file)
5025 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
5028 atomic_dec(&mddev->openers);
5034 static int md_media_changed(struct gendisk *disk)
5036 mddev_t *mddev = disk->private_data;
5038 return mddev->changed;
5041 static int md_revalidate(struct gendisk *disk)
5043 mddev_t *mddev = disk->private_data;
5048 static struct block_device_operations md_fops =
5050 .owner = THIS_MODULE,
5052 .release = md_release,
5054 .getgeo = md_getgeo,
5055 .media_changed = md_media_changed,
5056 .revalidate_disk= md_revalidate,
5059 static int md_thread(void * arg)
5061 mdk_thread_t *thread = arg;
5064 * md_thread is a 'system-thread', it's priority should be very
5065 * high. We avoid resource deadlocks individually in each
5066 * raid personality. (RAID5 does preallocation) We also use RR and
5067 * the very same RT priority as kswapd, thus we will never get
5068 * into a priority inversion deadlock.
5070 * we definitely have to have equal or higher priority than
5071 * bdflush, otherwise bdflush will deadlock if there are too
5072 * many dirty RAID5 blocks.
5075 allow_signal(SIGKILL);
5076 while (!kthread_should_stop()) {
5078 /* We need to wait INTERRUPTIBLE so that
5079 * we don't add to the load-average.
5080 * That means we need to be sure no signals are
5083 if (signal_pending(current))
5084 flush_signals(current);
5086 wait_event_interruptible_timeout
5088 test_bit(THREAD_WAKEUP, &thread->flags)
5089 || kthread_should_stop(),
5092 clear_bit(THREAD_WAKEUP, &thread->flags);
5094 thread->run(thread->mddev);
5100 void md_wakeup_thread(mdk_thread_t *thread)
5103 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5104 set_bit(THREAD_WAKEUP, &thread->flags);
5105 wake_up(&thread->wqueue);
5109 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5112 mdk_thread_t *thread;
5114 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5118 init_waitqueue_head(&thread->wqueue);
5121 thread->mddev = mddev;
5122 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5123 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5124 if (IS_ERR(thread->tsk)) {
5131 void md_unregister_thread(mdk_thread_t *thread)
5133 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5135 kthread_stop(thread->tsk);
5139 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5146 if (!rdev || test_bit(Faulty, &rdev->flags))
5149 if (mddev->external)
5150 set_bit(Blocked, &rdev->flags);
5152 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5154 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5155 __builtin_return_address(0),__builtin_return_address(1),
5156 __builtin_return_address(2),__builtin_return_address(3));
5160 if (!mddev->pers->error_handler)
5162 mddev->pers->error_handler(mddev,rdev);
5163 if (mddev->degraded)
5164 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5165 set_bit(StateChanged, &rdev->flags);
5166 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5167 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5168 md_wakeup_thread(mddev->thread);
5169 md_new_event_inintr(mddev);
5172 /* seq_file implementation /proc/mdstat */
5174 static void status_unused(struct seq_file *seq)
5178 struct list_head *tmp;
5180 seq_printf(seq, "unused devices: ");
5182 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
5183 char b[BDEVNAME_SIZE];
5185 seq_printf(seq, "%s ",
5186 bdevname(rdev->bdev,b));
5189 seq_printf(seq, "<none>");
5191 seq_printf(seq, "\n");
5195 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5197 sector_t max_blocks, resync, res;
5198 unsigned long dt, db, rt;
5200 unsigned int per_milli;
5202 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5204 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5205 max_blocks = mddev->resync_max_sectors >> 1;
5207 max_blocks = mddev->size;
5210 * Should not happen.
5216 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5217 * in a sector_t, and (max_blocks>>scale) will fit in a
5218 * u32, as those are the requirements for sector_div.
5219 * Thus 'scale' must be at least 10
5222 if (sizeof(sector_t) > sizeof(unsigned long)) {
5223 while ( max_blocks/2 > (1ULL<<(scale+32)))
5226 res = (resync>>scale)*1000;
5227 sector_div(res, (u32)((max_blocks>>scale)+1));
5231 int i, x = per_milli/50, y = 20-x;
5232 seq_printf(seq, "[");
5233 for (i = 0; i < x; i++)
5234 seq_printf(seq, "=");
5235 seq_printf(seq, ">");
5236 for (i = 0; i < y; i++)
5237 seq_printf(seq, ".");
5238 seq_printf(seq, "] ");
5240 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5241 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5243 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5245 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5246 "resync" : "recovery"))),
5247 per_milli/10, per_milli % 10,
5248 (unsigned long long) resync,
5249 (unsigned long long) max_blocks);
5252 * We do not want to overflow, so the order of operands and
5253 * the * 100 / 100 trick are important. We do a +1 to be
5254 * safe against division by zero. We only estimate anyway.
5256 * dt: time from mark until now
5257 * db: blocks written from mark until now
5258 * rt: remaining time
5260 dt = ((jiffies - mddev->resync_mark) / HZ);
5262 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5263 - mddev->resync_mark_cnt;
5264 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5266 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5268 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5271 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5273 struct list_head *tmp;
5283 spin_lock(&all_mddevs_lock);
5284 list_for_each(tmp,&all_mddevs)
5286 mddev = list_entry(tmp, mddev_t, all_mddevs);
5288 spin_unlock(&all_mddevs_lock);
5291 spin_unlock(&all_mddevs_lock);
5293 return (void*)2;/* tail */
5297 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5299 struct list_head *tmp;
5300 mddev_t *next_mddev, *mddev = v;
5306 spin_lock(&all_mddevs_lock);
5308 tmp = all_mddevs.next;
5310 tmp = mddev->all_mddevs.next;
5311 if (tmp != &all_mddevs)
5312 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5314 next_mddev = (void*)2;
5317 spin_unlock(&all_mddevs_lock);
5325 static void md_seq_stop(struct seq_file *seq, void *v)
5329 if (mddev && v != (void*)1 && v != (void*)2)
5333 struct mdstat_info {
5337 static int md_seq_show(struct seq_file *seq, void *v)
5341 struct list_head *tmp2;
5343 struct mdstat_info *mi = seq->private;
5344 struct bitmap *bitmap;
5346 if (v == (void*)1) {
5347 struct mdk_personality *pers;
5348 seq_printf(seq, "Personalities : ");
5349 spin_lock(&pers_lock);
5350 list_for_each_entry(pers, &pers_list, list)
5351 seq_printf(seq, "[%s] ", pers->name);
5353 spin_unlock(&pers_lock);
5354 seq_printf(seq, "\n");
5355 mi->event = atomic_read(&md_event_count);
5358 if (v == (void*)2) {
5363 if (mddev_lock(mddev) < 0)
5366 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5367 seq_printf(seq, "%s : %sactive", mdname(mddev),
5368 mddev->pers ? "" : "in");
5371 seq_printf(seq, " (read-only)");
5373 seq_printf(seq, " (auto-read-only)");
5374 seq_printf(seq, " %s", mddev->pers->name);
5378 rdev_for_each(rdev, tmp2, mddev) {
5379 char b[BDEVNAME_SIZE];
5380 seq_printf(seq, " %s[%d]",
5381 bdevname(rdev->bdev,b), rdev->desc_nr);
5382 if (test_bit(WriteMostly, &rdev->flags))
5383 seq_printf(seq, "(W)");
5384 if (test_bit(Faulty, &rdev->flags)) {
5385 seq_printf(seq, "(F)");
5387 } else if (rdev->raid_disk < 0)
5388 seq_printf(seq, "(S)"); /* spare */
5392 if (!list_empty(&mddev->disks)) {
5394 seq_printf(seq, "\n %llu blocks",
5395 (unsigned long long)
5396 mddev->array_sectors / 2);
5398 seq_printf(seq, "\n %llu blocks",
5399 (unsigned long long)size);
5401 if (mddev->persistent) {
5402 if (mddev->major_version != 0 ||
5403 mddev->minor_version != 90) {
5404 seq_printf(seq," super %d.%d",
5405 mddev->major_version,
5406 mddev->minor_version);
5408 } else if (mddev->external)
5409 seq_printf(seq, " super external:%s",
5410 mddev->metadata_type);
5412 seq_printf(seq, " super non-persistent");
5415 mddev->pers->status(seq, mddev);
5416 seq_printf(seq, "\n ");
5417 if (mddev->pers->sync_request) {
5418 if (mddev->curr_resync > 2) {
5419 status_resync(seq, mddev);
5420 seq_printf(seq, "\n ");
5421 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5422 seq_printf(seq, "\tresync=DELAYED\n ");
5423 else if (mddev->recovery_cp < MaxSector)
5424 seq_printf(seq, "\tresync=PENDING\n ");
5427 seq_printf(seq, "\n ");
5429 if ((bitmap = mddev->bitmap)) {
5430 unsigned long chunk_kb;
5431 unsigned long flags;
5432 spin_lock_irqsave(&bitmap->lock, flags);
5433 chunk_kb = bitmap->chunksize >> 10;
5434 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5436 bitmap->pages - bitmap->missing_pages,
5438 (bitmap->pages - bitmap->missing_pages)
5439 << (PAGE_SHIFT - 10),
5440 chunk_kb ? chunk_kb : bitmap->chunksize,
5441 chunk_kb ? "KB" : "B");
5443 seq_printf(seq, ", file: ");
5444 seq_path(seq, &bitmap->file->f_path, " \t\n");
5447 seq_printf(seq, "\n");
5448 spin_unlock_irqrestore(&bitmap->lock, flags);
5451 seq_printf(seq, "\n");
5453 mddev_unlock(mddev);
5458 static struct seq_operations md_seq_ops = {
5459 .start = md_seq_start,
5460 .next = md_seq_next,
5461 .stop = md_seq_stop,
5462 .show = md_seq_show,
5465 static int md_seq_open(struct inode *inode, struct file *file)
5468 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5472 error = seq_open(file, &md_seq_ops);
5476 struct seq_file *p = file->private_data;
5478 mi->event = atomic_read(&md_event_count);
5483 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5485 struct seq_file *m = filp->private_data;
5486 struct mdstat_info *mi = m->private;
5489 poll_wait(filp, &md_event_waiters, wait);
5491 /* always allow read */
5492 mask = POLLIN | POLLRDNORM;
5494 if (mi->event != atomic_read(&md_event_count))
5495 mask |= POLLERR | POLLPRI;
5499 static const struct file_operations md_seq_fops = {
5500 .owner = THIS_MODULE,
5501 .open = md_seq_open,
5503 .llseek = seq_lseek,
5504 .release = seq_release_private,
5505 .poll = mdstat_poll,
5508 int register_md_personality(struct mdk_personality *p)
5510 spin_lock(&pers_lock);
5511 list_add_tail(&p->list, &pers_list);
5512 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5513 spin_unlock(&pers_lock);
5517 int unregister_md_personality(struct mdk_personality *p)
5519 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5520 spin_lock(&pers_lock);
5521 list_del_init(&p->list);
5522 spin_unlock(&pers_lock);
5526 static int is_mddev_idle(mddev_t *mddev)
5534 rdev_for_each_rcu(rdev, mddev) {
5535 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5536 curr_events = part_stat_read(&disk->part0, sectors[0]) +
5537 part_stat_read(&disk->part0, sectors[1]) -
5538 atomic_read(&disk->sync_io);
5539 /* sync IO will cause sync_io to increase before the disk_stats
5540 * as sync_io is counted when a request starts, and
5541 * disk_stats is counted when it completes.
5542 * So resync activity will cause curr_events to be smaller than
5543 * when there was no such activity.
5544 * non-sync IO will cause disk_stat to increase without
5545 * increasing sync_io so curr_events will (eventually)
5546 * be larger than it was before. Once it becomes
5547 * substantially larger, the test below will cause
5548 * the array to appear non-idle, and resync will slow
5550 * If there is a lot of outstanding resync activity when
5551 * we set last_event to curr_events, then all that activity
5552 * completing might cause the array to appear non-idle
5553 * and resync will be slowed down even though there might
5554 * not have been non-resync activity. This will only
5555 * happen once though. 'last_events' will soon reflect
5556 * the state where there is little or no outstanding
5557 * resync requests, and further resync activity will
5558 * always make curr_events less than last_events.
5561 if (curr_events - rdev->last_events > 4096) {
5562 rdev->last_events = curr_events;
5570 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5572 /* another "blocks" (512byte) blocks have been synced */
5573 atomic_sub(blocks, &mddev->recovery_active);
5574 wake_up(&mddev->recovery_wait);
5576 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5577 md_wakeup_thread(mddev->thread);
5578 // stop recovery, signal do_sync ....
5583 /* md_write_start(mddev, bi)
5584 * If we need to update some array metadata (e.g. 'active' flag
5585 * in superblock) before writing, schedule a superblock update
5586 * and wait for it to complete.
5588 void md_write_start(mddev_t *mddev, struct bio *bi)
5591 if (bio_data_dir(bi) != WRITE)
5594 BUG_ON(mddev->ro == 1);
5595 if (mddev->ro == 2) {
5596 /* need to switch to read/write */
5598 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5599 md_wakeup_thread(mddev->thread);
5600 md_wakeup_thread(mddev->sync_thread);
5603 atomic_inc(&mddev->writes_pending);
5604 if (mddev->safemode == 1)
5605 mddev->safemode = 0;
5606 if (mddev->in_sync) {
5607 spin_lock_irq(&mddev->write_lock);
5608 if (mddev->in_sync) {
5610 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5611 md_wakeup_thread(mddev->thread);
5614 spin_unlock_irq(&mddev->write_lock);
5617 sysfs_notify(&mddev->kobj, NULL, "array_state");
5618 wait_event(mddev->sb_wait,
5619 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5620 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5623 void md_write_end(mddev_t *mddev)
5625 if (atomic_dec_and_test(&mddev->writes_pending)) {
5626 if (mddev->safemode == 2)
5627 md_wakeup_thread(mddev->thread);
5628 else if (mddev->safemode_delay)
5629 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5633 /* md_allow_write(mddev)
5634 * Calling this ensures that the array is marked 'active' so that writes
5635 * may proceed without blocking. It is important to call this before
5636 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5637 * Must be called with mddev_lock held.
5639 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5640 * is dropped, so return -EAGAIN after notifying userspace.
5642 int md_allow_write(mddev_t *mddev)
5648 if (!mddev->pers->sync_request)
5651 spin_lock_irq(&mddev->write_lock);
5652 if (mddev->in_sync) {
5654 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5655 if (mddev->safemode_delay &&
5656 mddev->safemode == 0)
5657 mddev->safemode = 1;
5658 spin_unlock_irq(&mddev->write_lock);
5659 md_update_sb(mddev, 0);
5660 sysfs_notify(&mddev->kobj, NULL, "array_state");
5662 spin_unlock_irq(&mddev->write_lock);
5664 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
5669 EXPORT_SYMBOL_GPL(md_allow_write);
5671 #define SYNC_MARKS 10
5672 #define SYNC_MARK_STEP (3*HZ)
5673 void md_do_sync(mddev_t *mddev)
5676 unsigned int currspeed = 0,
5678 sector_t max_sectors,j, io_sectors;
5679 unsigned long mark[SYNC_MARKS];
5680 sector_t mark_cnt[SYNC_MARKS];
5682 struct list_head *tmp;
5683 sector_t last_check;
5685 struct list_head *rtmp;
5689 /* just incase thread restarts... */
5690 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5692 if (mddev->ro) /* never try to sync a read-only array */
5695 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5696 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5697 desc = "data-check";
5698 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5699 desc = "requested-resync";
5702 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5707 /* we overload curr_resync somewhat here.
5708 * 0 == not engaged in resync at all
5709 * 2 == checking that there is no conflict with another sync
5710 * 1 == like 2, but have yielded to allow conflicting resync to
5712 * other == active in resync - this many blocks
5714 * Before starting a resync we must have set curr_resync to
5715 * 2, and then checked that every "conflicting" array has curr_resync
5716 * less than ours. When we find one that is the same or higher
5717 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5718 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5719 * This will mean we have to start checking from the beginning again.
5724 mddev->curr_resync = 2;
5727 if (kthread_should_stop()) {
5728 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5731 for_each_mddev(mddev2, tmp) {
5732 if (mddev2 == mddev)
5734 if (!mddev->parallel_resync
5735 && mddev2->curr_resync
5736 && match_mddev_units(mddev, mddev2)) {
5738 if (mddev < mddev2 && mddev->curr_resync == 2) {
5739 /* arbitrarily yield */
5740 mddev->curr_resync = 1;
5741 wake_up(&resync_wait);
5743 if (mddev > mddev2 && mddev->curr_resync == 1)
5744 /* no need to wait here, we can wait the next
5745 * time 'round when curr_resync == 2
5748 /* We need to wait 'interruptible' so as not to
5749 * contribute to the load average, and not to
5750 * be caught by 'softlockup'
5752 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
5753 if (!kthread_should_stop() &&
5754 mddev2->curr_resync >= mddev->curr_resync) {
5755 printk(KERN_INFO "md: delaying %s of %s"
5756 " until %s has finished (they"
5757 " share one or more physical units)\n",
5758 desc, mdname(mddev), mdname(mddev2));
5760 if (signal_pending(current))
5761 flush_signals(current);
5763 finish_wait(&resync_wait, &wq);
5766 finish_wait(&resync_wait, &wq);
5769 } while (mddev->curr_resync < 2);
5772 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5773 /* resync follows the size requested by the personality,
5774 * which defaults to physical size, but can be virtual size
5776 max_sectors = mddev->resync_max_sectors;
5777 mddev->resync_mismatches = 0;
5778 /* we don't use the checkpoint if there's a bitmap */
5779 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5780 j = mddev->resync_min;
5781 else if (!mddev->bitmap)
5782 j = mddev->recovery_cp;
5784 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5785 max_sectors = mddev->size << 1;
5787 /* recovery follows the physical size of devices */
5788 max_sectors = mddev->size << 1;
5790 rdev_for_each(rdev, rtmp, mddev)
5791 if (rdev->raid_disk >= 0 &&
5792 !test_bit(Faulty, &rdev->flags) &&
5793 !test_bit(In_sync, &rdev->flags) &&
5794 rdev->recovery_offset < j)
5795 j = rdev->recovery_offset;
5798 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5799 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5800 " %d KB/sec/disk.\n", speed_min(mddev));
5801 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5802 "(but not more than %d KB/sec) for %s.\n",
5803 speed_max(mddev), desc);
5805 is_mddev_idle(mddev); /* this also initializes IO event counters */
5808 for (m = 0; m < SYNC_MARKS; m++) {
5810 mark_cnt[m] = io_sectors;
5813 mddev->resync_mark = mark[last_mark];
5814 mddev->resync_mark_cnt = mark_cnt[last_mark];
5817 * Tune reconstruction:
5819 window = 32*(PAGE_SIZE/512);
5820 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5821 window/2,(unsigned long long) max_sectors/2);
5823 atomic_set(&mddev->recovery_active, 0);
5828 "md: resuming %s of %s from checkpoint.\n",
5829 desc, mdname(mddev));
5830 mddev->curr_resync = j;
5833 while (j < max_sectors) {
5837 if (j >= mddev->resync_max) {
5838 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5839 wait_event(mddev->recovery_wait,
5840 mddev->resync_max > j
5841 || kthread_should_stop());
5843 if (kthread_should_stop())
5845 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5846 currspeed < speed_min(mddev));
5848 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5852 if (!skipped) { /* actual IO requested */
5853 io_sectors += sectors;
5854 atomic_add(sectors, &mddev->recovery_active);
5858 if (j>1) mddev->curr_resync = j;
5859 mddev->curr_mark_cnt = io_sectors;
5860 if (last_check == 0)
5861 /* this is the earliers that rebuilt will be
5862 * visible in /proc/mdstat
5864 md_new_event(mddev);
5866 if (last_check + window > io_sectors || j == max_sectors)
5869 last_check = io_sectors;
5871 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5875 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5877 int next = (last_mark+1) % SYNC_MARKS;
5879 mddev->resync_mark = mark[next];
5880 mddev->resync_mark_cnt = mark_cnt[next];
5881 mark[next] = jiffies;
5882 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5887 if (kthread_should_stop())
5892 * this loop exits only if either when we are slower than
5893 * the 'hard' speed limit, or the system was IO-idle for
5895 * the system might be non-idle CPU-wise, but we only care
5896 * about not overloading the IO subsystem. (things like an
5897 * e2fsck being done on the RAID array should execute fast)
5899 blk_unplug(mddev->queue);
5902 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5903 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5905 if (currspeed > speed_min(mddev)) {
5906 if ((currspeed > speed_max(mddev)) ||
5907 !is_mddev_idle(mddev)) {
5913 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5915 * this also signals 'finished resyncing' to md_stop
5918 blk_unplug(mddev->queue);
5920 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5922 /* tell personality that we are finished */
5923 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5925 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5926 mddev->curr_resync > 2) {
5927 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5928 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5929 if (mddev->curr_resync >= mddev->recovery_cp) {
5931 "md: checkpointing %s of %s.\n",
5932 desc, mdname(mddev));
5933 mddev->recovery_cp = mddev->curr_resync;
5936 mddev->recovery_cp = MaxSector;
5938 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5939 mddev->curr_resync = MaxSector;
5940 rdev_for_each(rdev, rtmp, mddev)
5941 if (rdev->raid_disk >= 0 &&
5942 !test_bit(Faulty, &rdev->flags) &&
5943 !test_bit(In_sync, &rdev->flags) &&
5944 rdev->recovery_offset < mddev->curr_resync)
5945 rdev->recovery_offset = mddev->curr_resync;
5948 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5951 mddev->curr_resync = 0;
5952 mddev->resync_min = 0;
5953 mddev->resync_max = MaxSector;
5954 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5955 wake_up(&resync_wait);
5956 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5957 md_wakeup_thread(mddev->thread);
5962 * got a signal, exit.
5965 "md: md_do_sync() got signal ... exiting\n");
5966 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5970 EXPORT_SYMBOL_GPL(md_do_sync);
5973 static int remove_and_add_spares(mddev_t *mddev)
5976 struct list_head *rtmp;
5979 rdev_for_each(rdev, rtmp, mddev)
5980 if (rdev->raid_disk >= 0 &&
5981 !test_bit(Blocked, &rdev->flags) &&
5982 (test_bit(Faulty, &rdev->flags) ||
5983 ! test_bit(In_sync, &rdev->flags)) &&
5984 atomic_read(&rdev->nr_pending)==0) {
5985 if (mddev->pers->hot_remove_disk(
5986 mddev, rdev->raid_disk)==0) {
5988 sprintf(nm,"rd%d", rdev->raid_disk);
5989 sysfs_remove_link(&mddev->kobj, nm);
5990 rdev->raid_disk = -1;
5994 if (mddev->degraded && ! mddev->ro) {
5995 rdev_for_each(rdev, rtmp, mddev) {
5996 if (rdev->raid_disk >= 0 &&
5997 !test_bit(In_sync, &rdev->flags) &&
5998 !test_bit(Blocked, &rdev->flags))
6000 if (rdev->raid_disk < 0
6001 && !test_bit(Faulty, &rdev->flags)) {
6002 rdev->recovery_offset = 0;
6004 hot_add_disk(mddev, rdev) == 0) {
6006 sprintf(nm, "rd%d", rdev->raid_disk);
6007 if (sysfs_create_link(&mddev->kobj,
6010 "md: cannot register "
6014 md_new_event(mddev);
6023 * This routine is regularly called by all per-raid-array threads to
6024 * deal with generic issues like resync and super-block update.
6025 * Raid personalities that don't have a thread (linear/raid0) do not
6026 * need this as they never do any recovery or update the superblock.
6028 * It does not do any resync itself, but rather "forks" off other threads
6029 * to do that as needed.
6030 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6031 * "->recovery" and create a thread at ->sync_thread.
6032 * When the thread finishes it sets MD_RECOVERY_DONE
6033 * and wakeups up this thread which will reap the thread and finish up.
6034 * This thread also removes any faulty devices (with nr_pending == 0).
6036 * The overall approach is:
6037 * 1/ if the superblock needs updating, update it.
6038 * 2/ If a recovery thread is running, don't do anything else.
6039 * 3/ If recovery has finished, clean up, possibly marking spares active.
6040 * 4/ If there are any faulty devices, remove them.
6041 * 5/ If array is degraded, try to add spares devices
6042 * 6/ If array has spares or is not in-sync, start a resync thread.
6044 void md_check_recovery(mddev_t *mddev)
6047 struct list_head *rtmp;
6051 bitmap_daemon_work(mddev->bitmap);
6053 if (test_and_clear_bit(MD_NOTIFY_ARRAY_STATE, &mddev->flags))
6054 sysfs_notify(&mddev->kobj, NULL, "array_state");
6059 if (signal_pending(current)) {
6060 if (mddev->pers->sync_request && !mddev->external) {
6061 printk(KERN_INFO "md: %s in immediate safe mode\n",
6063 mddev->safemode = 2;
6065 flush_signals(current);
6068 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6071 (mddev->flags && !mddev->external) ||
6072 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6073 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6074 (mddev->external == 0 && mddev->safemode == 1) ||
6075 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6076 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6080 if (mddev_trylock(mddev)) {
6084 /* Only thing we do on a ro array is remove
6087 remove_and_add_spares(mddev);
6088 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6092 if (!mddev->external) {
6094 spin_lock_irq(&mddev->write_lock);
6095 if (mddev->safemode &&
6096 !atomic_read(&mddev->writes_pending) &&
6098 mddev->recovery_cp == MaxSector) {
6101 if (mddev->persistent)
6102 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6104 if (mddev->safemode == 1)
6105 mddev->safemode = 0;
6106 spin_unlock_irq(&mddev->write_lock);
6108 sysfs_notify(&mddev->kobj, NULL, "array_state");
6112 md_update_sb(mddev, 0);
6114 rdev_for_each(rdev, rtmp, mddev)
6115 if (test_and_clear_bit(StateChanged, &rdev->flags))
6116 sysfs_notify(&rdev->kobj, NULL, "state");
6119 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6120 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6121 /* resync/recovery still happening */
6122 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6125 if (mddev->sync_thread) {
6126 /* resync has finished, collect result */
6127 md_unregister_thread(mddev->sync_thread);
6128 mddev->sync_thread = NULL;
6129 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6130 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6132 /* activate any spares */
6133 if (mddev->pers->spare_active(mddev))
6134 sysfs_notify(&mddev->kobj, NULL,
6137 md_update_sb(mddev, 1);
6139 /* if array is no-longer degraded, then any saved_raid_disk
6140 * information must be scrapped
6142 if (!mddev->degraded)
6143 rdev_for_each(rdev, rtmp, mddev)
6144 rdev->saved_raid_disk = -1;
6146 mddev->recovery = 0;
6147 /* flag recovery needed just to double check */
6148 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6149 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6150 md_new_event(mddev);
6153 /* Set RUNNING before clearing NEEDED to avoid
6154 * any transients in the value of "sync_action".
6156 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6157 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6158 /* Clear some bits that don't mean anything, but
6161 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6162 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6164 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6166 /* no recovery is running.
6167 * remove any failed drives, then
6168 * add spares if possible.
6169 * Spare are also removed and re-added, to allow
6170 * the personality to fail the re-add.
6173 if (mddev->reshape_position != MaxSector) {
6174 if (mddev->pers->check_reshape(mddev) != 0)
6175 /* Cannot proceed */
6177 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6178 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6179 } else if ((spares = remove_and_add_spares(mddev))) {
6180 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6181 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6182 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6183 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6184 } else if (mddev->recovery_cp < MaxSector) {
6185 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6186 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6187 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6188 /* nothing to be done ... */
6191 if (mddev->pers->sync_request) {
6192 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6193 /* We are adding a device or devices to an array
6194 * which has the bitmap stored on all devices.
6195 * So make sure all bitmap pages get written
6197 bitmap_write_all(mddev->bitmap);
6199 mddev->sync_thread = md_register_thread(md_do_sync,
6202 if (!mddev->sync_thread) {
6203 printk(KERN_ERR "%s: could not start resync"
6206 /* leave the spares where they are, it shouldn't hurt */
6207 mddev->recovery = 0;
6209 md_wakeup_thread(mddev->sync_thread);
6210 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6211 md_new_event(mddev);
6214 if (!mddev->sync_thread) {
6215 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6216 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6218 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6220 mddev_unlock(mddev);
6224 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6226 sysfs_notify(&rdev->kobj, NULL, "state");
6227 wait_event_timeout(rdev->blocked_wait,
6228 !test_bit(Blocked, &rdev->flags),
6229 msecs_to_jiffies(5000));
6230 rdev_dec_pending(rdev, mddev);
6232 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6234 static int md_notify_reboot(struct notifier_block *this,
6235 unsigned long code, void *x)
6237 struct list_head *tmp;
6240 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6242 printk(KERN_INFO "md: stopping all md devices.\n");
6244 for_each_mddev(mddev, tmp)
6245 if (mddev_trylock(mddev)) {
6246 /* Force a switch to readonly even array
6247 * appears to still be in use. Hence
6250 do_md_stop(mddev, 1, 100);
6251 mddev_unlock(mddev);
6254 * certain more exotic SCSI devices are known to be
6255 * volatile wrt too early system reboots. While the
6256 * right place to handle this issue is the given
6257 * driver, we do want to have a safe RAID driver ...
6264 static struct notifier_block md_notifier = {
6265 .notifier_call = md_notify_reboot,
6267 .priority = INT_MAX, /* before any real devices */
6270 static void md_geninit(void)
6272 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6274 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6277 static int __init md_init(void)
6279 if (register_blkdev(MAJOR_NR, "md"))
6281 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6282 unregister_blkdev(MAJOR_NR, "md");
6285 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6286 md_probe, NULL, NULL);
6287 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6288 md_probe, NULL, NULL);
6290 register_reboot_notifier(&md_notifier);
6291 raid_table_header = register_sysctl_table(raid_root_table);
6301 * Searches all registered partitions for autorun RAID arrays
6305 static LIST_HEAD(all_detected_devices);
6306 struct detected_devices_node {
6307 struct list_head list;
6311 void md_autodetect_dev(dev_t dev)
6313 struct detected_devices_node *node_detected_dev;
6315 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6316 if (node_detected_dev) {
6317 node_detected_dev->dev = dev;
6318 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6320 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6321 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6326 static void autostart_arrays(int part)
6329 struct detected_devices_node *node_detected_dev;
6331 int i_scanned, i_passed;
6336 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6338 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6340 node_detected_dev = list_entry(all_detected_devices.next,
6341 struct detected_devices_node, list);
6342 list_del(&node_detected_dev->list);
6343 dev = node_detected_dev->dev;
6344 kfree(node_detected_dev);
6345 rdev = md_import_device(dev,0, 90);
6349 if (test_bit(Faulty, &rdev->flags)) {
6353 set_bit(AutoDetected, &rdev->flags);
6354 list_add(&rdev->same_set, &pending_raid_disks);
6358 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6359 i_scanned, i_passed);
6361 autorun_devices(part);
6364 #endif /* !MODULE */
6366 static __exit void md_exit(void)
6369 struct list_head *tmp;
6371 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6372 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6374 unregister_blkdev(MAJOR_NR,"md");
6375 unregister_blkdev(mdp_major, "mdp");
6376 unregister_reboot_notifier(&md_notifier);
6377 unregister_sysctl_table(raid_table_header);
6378 remove_proc_entry("mdstat", NULL);
6379 for_each_mddev(mddev, tmp) {
6380 struct gendisk *disk = mddev->gendisk;
6383 export_array(mddev);
6386 mddev->gendisk = NULL;
6391 subsys_initcall(md_init);
6392 module_exit(md_exit)
6394 static int get_ro(char *buffer, struct kernel_param *kp)
6396 return sprintf(buffer, "%d", start_readonly);
6398 static int set_ro(const char *val, struct kernel_param *kp)
6401 int num = simple_strtoul(val, &e, 10);
6402 if (*val && (*e == '\0' || *e == '\n')) {
6403 start_readonly = num;
6409 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6410 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6413 EXPORT_SYMBOL(register_md_personality);
6414 EXPORT_SYMBOL(unregister_md_personality);
6415 EXPORT_SYMBOL(md_error);
6416 EXPORT_SYMBOL(md_done_sync);
6417 EXPORT_SYMBOL(md_write_start);
6418 EXPORT_SYMBOL(md_write_end);
6419 EXPORT_SYMBOL(md_register_thread);
6420 EXPORT_SYMBOL(md_unregister_thread);
6421 EXPORT_SYMBOL(md_wakeup_thread);
6422 EXPORT_SYMBOL(md_check_recovery);
6423 MODULE_LICENSE("GPL");
6425 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);