2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/module.h>
36 #include <linux/kernel.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/buffer_head.h> /* for invalidate_bdev */
43 #include <linux/poll.h>
44 #include <linux/mutex.h>
45 #include <linux/ctype.h>
46 #include <linux/freezer.h>
48 #include <linux/init.h>
50 #include <linux/file.h>
53 #include <linux/kmod.h>
56 #include <asm/unaligned.h>
58 #define MAJOR_NR MD_MAJOR
61 /* 63 partitions with the alternate major number (mdp) */
62 #define MdpMinorShift 6
65 #define dprintk(x...) ((void)(DEBUG && printk(x)))
69 static void autostart_arrays (int part);
72 static LIST_HEAD(pers_list);
73 static DEFINE_SPINLOCK(pers_lock);
75 static void md_print_devices(void);
77 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
79 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
82 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
83 * is 1000 KB/sec, so the extra system load does not show up that much.
84 * Increase it if you want to have more _guaranteed_ speed. Note that
85 * the RAID driver will use the maximum available bandwidth if the IO
86 * subsystem is idle. There is also an 'absolute maximum' reconstruction
87 * speed limit - in case reconstruction slows down your system despite
90 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
91 * or /sys/block/mdX/md/sync_speed_{min,max}
94 static int sysctl_speed_limit_min = 1000;
95 static int sysctl_speed_limit_max = 200000;
96 static inline int speed_min(mddev_t *mddev)
98 return mddev->sync_speed_min ?
99 mddev->sync_speed_min : sysctl_speed_limit_min;
102 static inline int speed_max(mddev_t *mddev)
104 return mddev->sync_speed_max ?
105 mddev->sync_speed_max : sysctl_speed_limit_max;
108 static struct ctl_table_header *raid_table_header;
110 static ctl_table raid_table[] = {
112 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
113 .procname = "speed_limit_min",
114 .data = &sysctl_speed_limit_min,
115 .maxlen = sizeof(int),
116 .mode = S_IRUGO|S_IWUSR,
117 .proc_handler = &proc_dointvec,
120 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
121 .procname = "speed_limit_max",
122 .data = &sysctl_speed_limit_max,
123 .maxlen = sizeof(int),
124 .mode = S_IRUGO|S_IWUSR,
125 .proc_handler = &proc_dointvec,
130 static ctl_table raid_dir_table[] = {
132 .ctl_name = DEV_RAID,
135 .mode = S_IRUGO|S_IXUGO,
141 static ctl_table raid_root_table[] = {
147 .child = raid_dir_table,
152 static struct block_device_operations md_fops;
154 static int start_readonly;
157 * We have a system wide 'event count' that is incremented
158 * on any 'interesting' event, and readers of /proc/mdstat
159 * can use 'poll' or 'select' to find out when the event
163 * start array, stop array, error, add device, remove device,
164 * start build, activate spare
166 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
167 static atomic_t md_event_count;
168 void md_new_event(mddev_t *mddev)
170 atomic_inc(&md_event_count);
171 wake_up(&md_event_waiters);
173 EXPORT_SYMBOL_GPL(md_new_event);
175 /* Alternate version that can be called from interrupts
176 * when calling sysfs_notify isn't needed.
178 static void md_new_event_inintr(mddev_t *mddev)
180 atomic_inc(&md_event_count);
181 wake_up(&md_event_waiters);
185 * Enables to iterate over all existing md arrays
186 * all_mddevs_lock protects this list.
188 static LIST_HEAD(all_mddevs);
189 static DEFINE_SPINLOCK(all_mddevs_lock);
193 * iterates through all used mddevs in the system.
194 * We take care to grab the all_mddevs_lock whenever navigating
195 * the list, and to always hold a refcount when unlocked.
196 * Any code which breaks out of this loop while own
197 * a reference to the current mddev and must mddev_put it.
199 #define for_each_mddev(mddev,tmp) \
201 for (({ spin_lock(&all_mddevs_lock); \
202 tmp = all_mddevs.next; \
204 ({ if (tmp != &all_mddevs) \
205 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
206 spin_unlock(&all_mddevs_lock); \
207 if (mddev) mddev_put(mddev); \
208 mddev = list_entry(tmp, mddev_t, all_mddevs); \
209 tmp != &all_mddevs;}); \
210 ({ spin_lock(&all_mddevs_lock); \
215 static int md_fail_request (struct request_queue *q, struct bio *bio)
221 static inline mddev_t *mddev_get(mddev_t *mddev)
223 atomic_inc(&mddev->active);
227 static void mddev_put(mddev_t *mddev)
229 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
231 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
232 list_del(&mddev->all_mddevs);
233 spin_unlock(&all_mddevs_lock);
234 blk_cleanup_queue(mddev->queue);
235 kobject_put(&mddev->kobj);
237 spin_unlock(&all_mddevs_lock);
240 static mddev_t * mddev_find(dev_t unit)
242 mddev_t *mddev, *new = NULL;
245 spin_lock(&all_mddevs_lock);
246 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
247 if (mddev->unit == unit) {
249 spin_unlock(&all_mddevs_lock);
255 list_add(&new->all_mddevs, &all_mddevs);
256 spin_unlock(&all_mddevs_lock);
259 spin_unlock(&all_mddevs_lock);
261 new = kzalloc(sizeof(*new), GFP_KERNEL);
266 if (MAJOR(unit) == MD_MAJOR)
267 new->md_minor = MINOR(unit);
269 new->md_minor = MINOR(unit) >> MdpMinorShift;
271 mutex_init(&new->reconfig_mutex);
272 INIT_LIST_HEAD(&new->disks);
273 INIT_LIST_HEAD(&new->all_mddevs);
274 init_timer(&new->safemode_timer);
275 atomic_set(&new->active, 1);
276 spin_lock_init(&new->write_lock);
277 init_waitqueue_head(&new->sb_wait);
278 init_waitqueue_head(&new->recovery_wait);
279 new->reshape_position = MaxSector;
281 new->resync_max = MaxSector;
282 new->level = LEVEL_NONE;
284 new->queue = blk_alloc_queue(GFP_KERNEL);
289 /* Can be unlocked because the queue is new: no concurrency */
290 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue);
292 blk_queue_make_request(new->queue, md_fail_request);
297 static inline int mddev_lock(mddev_t * mddev)
299 return mutex_lock_interruptible(&mddev->reconfig_mutex);
302 static inline int mddev_trylock(mddev_t * mddev)
304 return mutex_trylock(&mddev->reconfig_mutex);
307 static inline void mddev_unlock(mddev_t * mddev)
309 mutex_unlock(&mddev->reconfig_mutex);
311 md_wakeup_thread(mddev->thread);
314 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
317 struct list_head *tmp;
319 rdev_for_each(rdev, tmp, mddev) {
320 if (rdev->desc_nr == nr)
326 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
328 struct list_head *tmp;
331 rdev_for_each(rdev, tmp, mddev) {
332 if (rdev->bdev->bd_dev == dev)
338 static struct mdk_personality *find_pers(int level, char *clevel)
340 struct mdk_personality *pers;
341 list_for_each_entry(pers, &pers_list, list) {
342 if (level != LEVEL_NONE && pers->level == level)
344 if (strcmp(pers->name, clevel)==0)
350 /* return the offset of the super block in 512byte sectors */
351 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
353 sector_t num_sectors = bdev->bd_inode->i_size / 512;
354 return MD_NEW_SIZE_SECTORS(num_sectors);
357 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
359 sector_t num_sectors = rdev->sb_offset * 2;
362 num_sectors &= ~((sector_t)chunk_size/512 - 1);
366 static int alloc_disk_sb(mdk_rdev_t * rdev)
371 rdev->sb_page = alloc_page(GFP_KERNEL);
372 if (!rdev->sb_page) {
373 printk(KERN_ALERT "md: out of memory.\n");
380 static void free_disk_sb(mdk_rdev_t * rdev)
383 put_page(rdev->sb_page);
385 rdev->sb_page = NULL;
392 static void super_written(struct bio *bio, int error)
394 mdk_rdev_t *rdev = bio->bi_private;
395 mddev_t *mddev = rdev->mddev;
397 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
398 printk("md: super_written gets error=%d, uptodate=%d\n",
399 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
400 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
401 md_error(mddev, rdev);
404 if (atomic_dec_and_test(&mddev->pending_writes))
405 wake_up(&mddev->sb_wait);
409 static void super_written_barrier(struct bio *bio, int error)
411 struct bio *bio2 = bio->bi_private;
412 mdk_rdev_t *rdev = bio2->bi_private;
413 mddev_t *mddev = rdev->mddev;
415 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
416 error == -EOPNOTSUPP) {
418 /* barriers don't appear to be supported :-( */
419 set_bit(BarriersNotsupp, &rdev->flags);
420 mddev->barriers_work = 0;
421 spin_lock_irqsave(&mddev->write_lock, flags);
422 bio2->bi_next = mddev->biolist;
423 mddev->biolist = bio2;
424 spin_unlock_irqrestore(&mddev->write_lock, flags);
425 wake_up(&mddev->sb_wait);
429 bio->bi_private = rdev;
430 super_written(bio, error);
434 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
435 sector_t sector, int size, struct page *page)
437 /* write first size bytes of page to sector of rdev
438 * Increment mddev->pending_writes before returning
439 * and decrement it on completion, waking up sb_wait
440 * if zero is reached.
441 * If an error occurred, call md_error
443 * As we might need to resubmit the request if BIO_RW_BARRIER
444 * causes ENOTSUPP, we allocate a spare bio...
446 struct bio *bio = bio_alloc(GFP_NOIO, 1);
447 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
449 bio->bi_bdev = rdev->bdev;
450 bio->bi_sector = sector;
451 bio_add_page(bio, page, size, 0);
452 bio->bi_private = rdev;
453 bio->bi_end_io = super_written;
456 atomic_inc(&mddev->pending_writes);
457 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
459 rw |= (1<<BIO_RW_BARRIER);
460 rbio = bio_clone(bio, GFP_NOIO);
461 rbio->bi_private = bio;
462 rbio->bi_end_io = super_written_barrier;
463 submit_bio(rw, rbio);
468 void md_super_wait(mddev_t *mddev)
470 /* wait for all superblock writes that were scheduled to complete.
471 * if any had to be retried (due to BARRIER problems), retry them
475 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
476 if (atomic_read(&mddev->pending_writes)==0)
478 while (mddev->biolist) {
480 spin_lock_irq(&mddev->write_lock);
481 bio = mddev->biolist;
482 mddev->biolist = bio->bi_next ;
484 spin_unlock_irq(&mddev->write_lock);
485 submit_bio(bio->bi_rw, bio);
489 finish_wait(&mddev->sb_wait, &wq);
492 static void bi_complete(struct bio *bio, int error)
494 complete((struct completion*)bio->bi_private);
497 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
498 struct page *page, int rw)
500 struct bio *bio = bio_alloc(GFP_NOIO, 1);
501 struct completion event;
504 rw |= (1 << BIO_RW_SYNC);
507 bio->bi_sector = sector;
508 bio_add_page(bio, page, size, 0);
509 init_completion(&event);
510 bio->bi_private = &event;
511 bio->bi_end_io = bi_complete;
513 wait_for_completion(&event);
515 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
519 EXPORT_SYMBOL_GPL(sync_page_io);
521 static int read_disk_sb(mdk_rdev_t * rdev, int size)
523 char b[BDEVNAME_SIZE];
524 if (!rdev->sb_page) {
532 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
538 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
539 bdevname(rdev->bdev,b));
543 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
545 return sb1->set_uuid0 == sb2->set_uuid0 &&
546 sb1->set_uuid1 == sb2->set_uuid1 &&
547 sb1->set_uuid2 == sb2->set_uuid2 &&
548 sb1->set_uuid3 == sb2->set_uuid3;
551 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
554 mdp_super_t *tmp1, *tmp2;
556 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
557 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
559 if (!tmp1 || !tmp2) {
561 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
569 * nr_disks is not constant
574 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
582 static u32 md_csum_fold(u32 csum)
584 csum = (csum & 0xffff) + (csum >> 16);
585 return (csum & 0xffff) + (csum >> 16);
588 static unsigned int calc_sb_csum(mdp_super_t * sb)
591 u32 *sb32 = (u32*)sb;
593 unsigned int disk_csum, csum;
595 disk_csum = sb->sb_csum;
598 for (i = 0; i < MD_SB_BYTES/4 ; i++)
600 csum = (newcsum & 0xffffffff) + (newcsum>>32);
604 /* This used to use csum_partial, which was wrong for several
605 * reasons including that different results are returned on
606 * different architectures. It isn't critical that we get exactly
607 * the same return value as before (we always csum_fold before
608 * testing, and that removes any differences). However as we
609 * know that csum_partial always returned a 16bit value on
610 * alphas, do a fold to maximise conformity to previous behaviour.
612 sb->sb_csum = md_csum_fold(disk_csum);
614 sb->sb_csum = disk_csum;
621 * Handle superblock details.
622 * We want to be able to handle multiple superblock formats
623 * so we have a common interface to them all, and an array of
624 * different handlers.
625 * We rely on user-space to write the initial superblock, and support
626 * reading and updating of superblocks.
627 * Interface methods are:
628 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
629 * loads and validates a superblock on dev.
630 * if refdev != NULL, compare superblocks on both devices
632 * 0 - dev has a superblock that is compatible with refdev
633 * 1 - dev has a superblock that is compatible and newer than refdev
634 * so dev should be used as the refdev in future
635 * -EINVAL superblock incompatible or invalid
636 * -othererror e.g. -EIO
638 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
639 * Verify that dev is acceptable into mddev.
640 * The first time, mddev->raid_disks will be 0, and data from
641 * dev should be merged in. Subsequent calls check that dev
642 * is new enough. Return 0 or -EINVAL
644 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
645 * Update the superblock for rdev with data in mddev
646 * This does not write to disc.
652 struct module *owner;
653 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
655 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
656 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
657 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
658 unsigned long long size);
662 * load_super for 0.90.0
664 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
666 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
672 * Calculate the position of the superblock,
673 * it's at the end of the disk.
675 * It also happens to be a multiple of 4Kb.
677 sb_offset = calc_dev_sboffset(rdev->bdev) / 2;
678 rdev->sb_offset = sb_offset;
680 ret = read_disk_sb(rdev, MD_SB_BYTES);
685 bdevname(rdev->bdev, b);
686 sb = (mdp_super_t*)page_address(rdev->sb_page);
688 if (sb->md_magic != MD_SB_MAGIC) {
689 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
694 if (sb->major_version != 0 ||
695 sb->minor_version < 90 ||
696 sb->minor_version > 91) {
697 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
698 sb->major_version, sb->minor_version,
703 if (sb->raid_disks <= 0)
706 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
707 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
712 rdev->preferred_minor = sb->md_minor;
713 rdev->data_offset = 0;
714 rdev->sb_size = MD_SB_BYTES;
716 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
717 if (sb->level != 1 && sb->level != 4
718 && sb->level != 5 && sb->level != 6
719 && sb->level != 10) {
720 /* FIXME use a better test */
722 "md: bitmaps not supported for this level.\n");
727 if (sb->level == LEVEL_MULTIPATH)
730 rdev->desc_nr = sb->this_disk.number;
736 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
737 if (!uuid_equal(refsb, sb)) {
738 printk(KERN_WARNING "md: %s has different UUID to %s\n",
739 b, bdevname(refdev->bdev,b2));
742 if (!sb_equal(refsb, sb)) {
743 printk(KERN_WARNING "md: %s has same UUID"
744 " but different superblock to %s\n",
745 b, bdevname(refdev->bdev, b2));
749 ev2 = md_event(refsb);
755 rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2;
757 if (rdev->size < sb->size && sb->level > 1)
758 /* "this cannot possibly happen" ... */
766 * validate_super for 0.90.0
768 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
771 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
772 __u64 ev1 = md_event(sb);
774 rdev->raid_disk = -1;
775 clear_bit(Faulty, &rdev->flags);
776 clear_bit(In_sync, &rdev->flags);
777 clear_bit(WriteMostly, &rdev->flags);
778 clear_bit(BarriersNotsupp, &rdev->flags);
780 if (mddev->raid_disks == 0) {
781 mddev->major_version = 0;
782 mddev->minor_version = sb->minor_version;
783 mddev->patch_version = sb->patch_version;
785 mddev->chunk_size = sb->chunk_size;
786 mddev->ctime = sb->ctime;
787 mddev->utime = sb->utime;
788 mddev->level = sb->level;
789 mddev->clevel[0] = 0;
790 mddev->layout = sb->layout;
791 mddev->raid_disks = sb->raid_disks;
792 mddev->size = sb->size;
794 mddev->bitmap_offset = 0;
795 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
797 if (mddev->minor_version >= 91) {
798 mddev->reshape_position = sb->reshape_position;
799 mddev->delta_disks = sb->delta_disks;
800 mddev->new_level = sb->new_level;
801 mddev->new_layout = sb->new_layout;
802 mddev->new_chunk = sb->new_chunk;
804 mddev->reshape_position = MaxSector;
805 mddev->delta_disks = 0;
806 mddev->new_level = mddev->level;
807 mddev->new_layout = mddev->layout;
808 mddev->new_chunk = mddev->chunk_size;
811 if (sb->state & (1<<MD_SB_CLEAN))
812 mddev->recovery_cp = MaxSector;
814 if (sb->events_hi == sb->cp_events_hi &&
815 sb->events_lo == sb->cp_events_lo) {
816 mddev->recovery_cp = sb->recovery_cp;
818 mddev->recovery_cp = 0;
821 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
822 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
823 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
824 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
826 mddev->max_disks = MD_SB_DISKS;
828 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
829 mddev->bitmap_file == NULL)
830 mddev->bitmap_offset = mddev->default_bitmap_offset;
832 } else if (mddev->pers == NULL) {
833 /* Insist on good event counter while assembling */
835 if (ev1 < mddev->events)
837 } else if (mddev->bitmap) {
838 /* if adding to array with a bitmap, then we can accept an
839 * older device ... but not too old.
841 if (ev1 < mddev->bitmap->events_cleared)
844 if (ev1 < mddev->events)
845 /* just a hot-add of a new device, leave raid_disk at -1 */
849 if (mddev->level != LEVEL_MULTIPATH) {
850 desc = sb->disks + rdev->desc_nr;
852 if (desc->state & (1<<MD_DISK_FAULTY))
853 set_bit(Faulty, &rdev->flags);
854 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
855 desc->raid_disk < mddev->raid_disks */) {
856 set_bit(In_sync, &rdev->flags);
857 rdev->raid_disk = desc->raid_disk;
859 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
860 set_bit(WriteMostly, &rdev->flags);
861 } else /* MULTIPATH are always insync */
862 set_bit(In_sync, &rdev->flags);
867 * sync_super for 0.90.0
869 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
872 struct list_head *tmp;
874 int next_spare = mddev->raid_disks;
877 /* make rdev->sb match mddev data..
880 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
881 * 3/ any empty disks < next_spare become removed
883 * disks[0] gets initialised to REMOVED because
884 * we cannot be sure from other fields if it has
885 * been initialised or not.
888 int active=0, working=0,failed=0,spare=0,nr_disks=0;
890 rdev->sb_size = MD_SB_BYTES;
892 sb = (mdp_super_t*)page_address(rdev->sb_page);
894 memset(sb, 0, sizeof(*sb));
896 sb->md_magic = MD_SB_MAGIC;
897 sb->major_version = mddev->major_version;
898 sb->patch_version = mddev->patch_version;
899 sb->gvalid_words = 0; /* ignored */
900 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
901 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
902 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
903 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
905 sb->ctime = mddev->ctime;
906 sb->level = mddev->level;
907 sb->size = mddev->size;
908 sb->raid_disks = mddev->raid_disks;
909 sb->md_minor = mddev->md_minor;
910 sb->not_persistent = 0;
911 sb->utime = mddev->utime;
913 sb->events_hi = (mddev->events>>32);
914 sb->events_lo = (u32)mddev->events;
916 if (mddev->reshape_position == MaxSector)
917 sb->minor_version = 90;
919 sb->minor_version = 91;
920 sb->reshape_position = mddev->reshape_position;
921 sb->new_level = mddev->new_level;
922 sb->delta_disks = mddev->delta_disks;
923 sb->new_layout = mddev->new_layout;
924 sb->new_chunk = mddev->new_chunk;
926 mddev->minor_version = sb->minor_version;
929 sb->recovery_cp = mddev->recovery_cp;
930 sb->cp_events_hi = (mddev->events>>32);
931 sb->cp_events_lo = (u32)mddev->events;
932 if (mddev->recovery_cp == MaxSector)
933 sb->state = (1<< MD_SB_CLEAN);
937 sb->layout = mddev->layout;
938 sb->chunk_size = mddev->chunk_size;
940 if (mddev->bitmap && mddev->bitmap_file == NULL)
941 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
943 sb->disks[0].state = (1<<MD_DISK_REMOVED);
944 rdev_for_each(rdev2, tmp, mddev) {
947 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
948 && !test_bit(Faulty, &rdev2->flags))
949 desc_nr = rdev2->raid_disk;
951 desc_nr = next_spare++;
952 rdev2->desc_nr = desc_nr;
953 d = &sb->disks[rdev2->desc_nr];
955 d->number = rdev2->desc_nr;
956 d->major = MAJOR(rdev2->bdev->bd_dev);
957 d->minor = MINOR(rdev2->bdev->bd_dev);
958 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
959 && !test_bit(Faulty, &rdev2->flags))
960 d->raid_disk = rdev2->raid_disk;
962 d->raid_disk = rdev2->desc_nr; /* compatibility */
963 if (test_bit(Faulty, &rdev2->flags))
964 d->state = (1<<MD_DISK_FAULTY);
965 else if (test_bit(In_sync, &rdev2->flags)) {
966 d->state = (1<<MD_DISK_ACTIVE);
967 d->state |= (1<<MD_DISK_SYNC);
975 if (test_bit(WriteMostly, &rdev2->flags))
976 d->state |= (1<<MD_DISK_WRITEMOSTLY);
978 /* now set the "removed" and "faulty" bits on any missing devices */
979 for (i=0 ; i < mddev->raid_disks ; i++) {
980 mdp_disk_t *d = &sb->disks[i];
981 if (d->state == 0 && d->number == 0) {
984 d->state = (1<<MD_DISK_REMOVED);
985 d->state |= (1<<MD_DISK_FAULTY);
989 sb->nr_disks = nr_disks;
990 sb->active_disks = active;
991 sb->working_disks = working;
992 sb->failed_disks = failed;
993 sb->spare_disks = spare;
995 sb->this_disk = sb->disks[rdev->desc_nr];
996 sb->sb_csum = calc_sb_csum(sb);
1000 * rdev_size_change for 0.90.0
1002 static unsigned long long
1003 super_90_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size)
1005 if (size && size < rdev->mddev->size)
1006 return 0; /* component must fit device */
1007 size *= 2; /* convert to sectors */
1008 if (rdev->mddev->bitmap_offset)
1009 return 0; /* can't move bitmap */
1010 rdev->sb_offset = calc_dev_sboffset(rdev->bdev) / 2;
1011 if (!size || size > rdev->sb_offset*2)
1012 size = rdev->sb_offset*2;
1013 md_super_write(rdev->mddev, rdev, rdev->sb_offset << 1, rdev->sb_size,
1015 md_super_wait(rdev->mddev);
1016 return size/2; /* kB for sysfs */
1021 * version 1 superblock
1024 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1028 unsigned long long newcsum;
1029 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1030 __le32 *isuper = (__le32*)sb;
1033 disk_csum = sb->sb_csum;
1036 for (i=0; size>=4; size -= 4 )
1037 newcsum += le32_to_cpu(*isuper++);
1040 newcsum += le16_to_cpu(*(__le16*) isuper);
1042 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1043 sb->sb_csum = disk_csum;
1044 return cpu_to_le32(csum);
1047 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1049 struct mdp_superblock_1 *sb;
1052 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1056 * Calculate the position of the superblock.
1057 * It is always aligned to a 4K boundary and
1058 * depeding on minor_version, it can be:
1059 * 0: At least 8K, but less than 12K, from end of device
1060 * 1: At start of device
1061 * 2: 4K from start of device.
1063 switch(minor_version) {
1065 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1067 sb_offset &= ~(sector_t)(4*2-1);
1068 /* convert from sectors to K */
1080 rdev->sb_offset = sb_offset;
1082 /* superblock is rarely larger than 1K, but it can be larger,
1083 * and it is safe to read 4k, so we do that
1085 ret = read_disk_sb(rdev, 4096);
1086 if (ret) return ret;
1089 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1091 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1092 sb->major_version != cpu_to_le32(1) ||
1093 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1094 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1095 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1098 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1099 printk("md: invalid superblock checksum on %s\n",
1100 bdevname(rdev->bdev,b));
1103 if (le64_to_cpu(sb->data_size) < 10) {
1104 printk("md: data_size too small on %s\n",
1105 bdevname(rdev->bdev,b));
1108 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1109 if (sb->level != cpu_to_le32(1) &&
1110 sb->level != cpu_to_le32(4) &&
1111 sb->level != cpu_to_le32(5) &&
1112 sb->level != cpu_to_le32(6) &&
1113 sb->level != cpu_to_le32(10)) {
1115 "md: bitmaps not supported for this level.\n");
1120 rdev->preferred_minor = 0xffff;
1121 rdev->data_offset = le64_to_cpu(sb->data_offset);
1122 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1124 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1125 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1126 if (rdev->sb_size & bmask)
1127 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1130 && rdev->data_offset < sb_offset + (rdev->sb_size/512))
1133 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1136 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1142 struct mdp_superblock_1 *refsb =
1143 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1145 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1146 sb->level != refsb->level ||
1147 sb->layout != refsb->layout ||
1148 sb->chunksize != refsb->chunksize) {
1149 printk(KERN_WARNING "md: %s has strangely different"
1150 " superblock to %s\n",
1151 bdevname(rdev->bdev,b),
1152 bdevname(refdev->bdev,b2));
1155 ev1 = le64_to_cpu(sb->events);
1156 ev2 = le64_to_cpu(refsb->events);
1164 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1166 rdev->size = rdev->sb_offset;
1167 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1169 rdev->size = le64_to_cpu(sb->data_size)/2;
1170 if (le32_to_cpu(sb->chunksize))
1171 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1173 if (le64_to_cpu(sb->size) > rdev->size*2)
1178 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1180 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1181 __u64 ev1 = le64_to_cpu(sb->events);
1183 rdev->raid_disk = -1;
1184 clear_bit(Faulty, &rdev->flags);
1185 clear_bit(In_sync, &rdev->flags);
1186 clear_bit(WriteMostly, &rdev->flags);
1187 clear_bit(BarriersNotsupp, &rdev->flags);
1189 if (mddev->raid_disks == 0) {
1190 mddev->major_version = 1;
1191 mddev->patch_version = 0;
1192 mddev->external = 0;
1193 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1194 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1195 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1196 mddev->level = le32_to_cpu(sb->level);
1197 mddev->clevel[0] = 0;
1198 mddev->layout = le32_to_cpu(sb->layout);
1199 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1200 mddev->size = le64_to_cpu(sb->size)/2;
1201 mddev->events = ev1;
1202 mddev->bitmap_offset = 0;
1203 mddev->default_bitmap_offset = 1024 >> 9;
1205 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1206 memcpy(mddev->uuid, sb->set_uuid, 16);
1208 mddev->max_disks = (4096-256)/2;
1210 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1211 mddev->bitmap_file == NULL )
1212 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1214 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1215 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1216 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1217 mddev->new_level = le32_to_cpu(sb->new_level);
1218 mddev->new_layout = le32_to_cpu(sb->new_layout);
1219 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1221 mddev->reshape_position = MaxSector;
1222 mddev->delta_disks = 0;
1223 mddev->new_level = mddev->level;
1224 mddev->new_layout = mddev->layout;
1225 mddev->new_chunk = mddev->chunk_size;
1228 } else if (mddev->pers == NULL) {
1229 /* Insist of good event counter while assembling */
1231 if (ev1 < mddev->events)
1233 } else if (mddev->bitmap) {
1234 /* If adding to array with a bitmap, then we can accept an
1235 * older device, but not too old.
1237 if (ev1 < mddev->bitmap->events_cleared)
1240 if (ev1 < mddev->events)
1241 /* just a hot-add of a new device, leave raid_disk at -1 */
1244 if (mddev->level != LEVEL_MULTIPATH) {
1246 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1248 case 0xffff: /* spare */
1250 case 0xfffe: /* faulty */
1251 set_bit(Faulty, &rdev->flags);
1254 if ((le32_to_cpu(sb->feature_map) &
1255 MD_FEATURE_RECOVERY_OFFSET))
1256 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1258 set_bit(In_sync, &rdev->flags);
1259 rdev->raid_disk = role;
1262 if (sb->devflags & WriteMostly1)
1263 set_bit(WriteMostly, &rdev->flags);
1264 } else /* MULTIPATH are always insync */
1265 set_bit(In_sync, &rdev->flags);
1270 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1272 struct mdp_superblock_1 *sb;
1273 struct list_head *tmp;
1276 /* make rdev->sb match mddev and rdev data. */
1278 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1280 sb->feature_map = 0;
1282 sb->recovery_offset = cpu_to_le64(0);
1283 memset(sb->pad1, 0, sizeof(sb->pad1));
1284 memset(sb->pad2, 0, sizeof(sb->pad2));
1285 memset(sb->pad3, 0, sizeof(sb->pad3));
1287 sb->utime = cpu_to_le64((__u64)mddev->utime);
1288 sb->events = cpu_to_le64(mddev->events);
1290 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1292 sb->resync_offset = cpu_to_le64(0);
1294 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1296 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1297 sb->size = cpu_to_le64(mddev->size<<1);
1299 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1300 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1301 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1304 if (rdev->raid_disk >= 0 &&
1305 !test_bit(In_sync, &rdev->flags) &&
1306 rdev->recovery_offset > 0) {
1307 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1308 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1311 if (mddev->reshape_position != MaxSector) {
1312 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1313 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1314 sb->new_layout = cpu_to_le32(mddev->new_layout);
1315 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1316 sb->new_level = cpu_to_le32(mddev->new_level);
1317 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1321 rdev_for_each(rdev2, tmp, mddev)
1322 if (rdev2->desc_nr+1 > max_dev)
1323 max_dev = rdev2->desc_nr+1;
1325 if (max_dev > le32_to_cpu(sb->max_dev))
1326 sb->max_dev = cpu_to_le32(max_dev);
1327 for (i=0; i<max_dev;i++)
1328 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1330 rdev_for_each(rdev2, tmp, mddev) {
1332 if (test_bit(Faulty, &rdev2->flags))
1333 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1334 else if (test_bit(In_sync, &rdev2->flags))
1335 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1336 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1337 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1339 sb->dev_roles[i] = cpu_to_le16(0xffff);
1342 sb->sb_csum = calc_sb_1_csum(sb);
1345 static unsigned long long
1346 super_1_rdev_size_change(mdk_rdev_t *rdev, unsigned long long size)
1348 struct mdp_superblock_1 *sb;
1349 unsigned long long max_size;
1350 if (size && size < rdev->mddev->size)
1351 return 0; /* component must fit device */
1352 size *= 2; /* convert to sectors */
1353 if (rdev->sb_offset < rdev->data_offset/2) {
1354 /* minor versions 1 and 2; superblock before data */
1355 max_size = (rdev->bdev->bd_inode->i_size >> 9);
1356 max_size -= rdev->data_offset;
1357 if (!size || size > max_size)
1359 } else if (rdev->mddev->bitmap_offset) {
1360 /* minor version 0 with bitmap we can't move */
1363 /* minor version 0; superblock after data */
1365 sb_offset = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1366 sb_offset &= ~(sector_t)(4*2 - 1);
1367 max_size = rdev->size*2 + sb_offset - rdev->sb_offset*2;
1368 if (!size || size > max_size)
1370 rdev->sb_offset = sb_offset/2;
1372 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1373 sb->data_size = cpu_to_le64(size);
1374 sb->super_offset = rdev->sb_offset*2;
1375 sb->sb_csum = calc_sb_1_csum(sb);
1376 md_super_write(rdev->mddev, rdev, rdev->sb_offset << 1, rdev->sb_size,
1378 md_super_wait(rdev->mddev);
1379 return size/2; /* kB for sysfs */
1382 static struct super_type super_types[] = {
1385 .owner = THIS_MODULE,
1386 .load_super = super_90_load,
1387 .validate_super = super_90_validate,
1388 .sync_super = super_90_sync,
1389 .rdev_size_change = super_90_rdev_size_change,
1393 .owner = THIS_MODULE,
1394 .load_super = super_1_load,
1395 .validate_super = super_1_validate,
1396 .sync_super = super_1_sync,
1397 .rdev_size_change = super_1_rdev_size_change,
1401 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1403 struct list_head *tmp, *tmp2;
1404 mdk_rdev_t *rdev, *rdev2;
1406 rdev_for_each(rdev, tmp, mddev1)
1407 rdev_for_each(rdev2, tmp2, mddev2)
1408 if (rdev->bdev->bd_contains ==
1409 rdev2->bdev->bd_contains)
1415 static LIST_HEAD(pending_raid_disks);
1417 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1419 char b[BDEVNAME_SIZE];
1429 /* prevent duplicates */
1430 if (find_rdev(mddev, rdev->bdev->bd_dev))
1433 /* make sure rdev->size exceeds mddev->size */
1434 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1436 /* Cannot change size, so fail
1437 * If mddev->level <= 0, then we don't care
1438 * about aligning sizes (e.g. linear)
1440 if (mddev->level > 0)
1443 mddev->size = rdev->size;
1446 /* Verify rdev->desc_nr is unique.
1447 * If it is -1, assign a free number, else
1448 * check number is not in use
1450 if (rdev->desc_nr < 0) {
1452 if (mddev->pers) choice = mddev->raid_disks;
1453 while (find_rdev_nr(mddev, choice))
1455 rdev->desc_nr = choice;
1457 if (find_rdev_nr(mddev, rdev->desc_nr))
1460 bdevname(rdev->bdev,b);
1461 while ( (s=strchr(b, '/')) != NULL)
1464 rdev->mddev = mddev;
1465 printk(KERN_INFO "md: bind<%s>\n", b);
1467 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1470 if (rdev->bdev->bd_part)
1471 ko = &rdev->bdev->bd_part->dev.kobj;
1473 ko = &rdev->bdev->bd_disk->dev.kobj;
1474 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1475 kobject_del(&rdev->kobj);
1478 list_add(&rdev->same_set, &mddev->disks);
1479 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1483 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1488 static void md_delayed_delete(struct work_struct *ws)
1490 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1491 kobject_del(&rdev->kobj);
1492 kobject_put(&rdev->kobj);
1495 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1497 char b[BDEVNAME_SIZE];
1502 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1503 list_del_init(&rdev->same_set);
1504 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1506 sysfs_remove_link(&rdev->kobj, "block");
1508 /* We need to delay this, otherwise we can deadlock when
1509 * writing to 'remove' to "dev/state"
1511 INIT_WORK(&rdev->del_work, md_delayed_delete);
1512 kobject_get(&rdev->kobj);
1513 schedule_work(&rdev->del_work);
1517 * prevent the device from being mounted, repartitioned or
1518 * otherwise reused by a RAID array (or any other kernel
1519 * subsystem), by bd_claiming the device.
1521 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1524 struct block_device *bdev;
1525 char b[BDEVNAME_SIZE];
1527 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1529 printk(KERN_ERR "md: could not open %s.\n",
1530 __bdevname(dev, b));
1531 return PTR_ERR(bdev);
1533 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1535 printk(KERN_ERR "md: could not bd_claim %s.\n",
1541 set_bit(AllReserved, &rdev->flags);
1546 static void unlock_rdev(mdk_rdev_t *rdev)
1548 struct block_device *bdev = rdev->bdev;
1556 void md_autodetect_dev(dev_t dev);
1558 static void export_rdev(mdk_rdev_t * rdev)
1560 char b[BDEVNAME_SIZE];
1561 printk(KERN_INFO "md: export_rdev(%s)\n",
1562 bdevname(rdev->bdev,b));
1566 list_del_init(&rdev->same_set);
1568 if (test_bit(AutoDetected, &rdev->flags))
1569 md_autodetect_dev(rdev->bdev->bd_dev);
1572 kobject_put(&rdev->kobj);
1575 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1577 unbind_rdev_from_array(rdev);
1581 static void export_array(mddev_t *mddev)
1583 struct list_head *tmp;
1586 rdev_for_each(rdev, tmp, mddev) {
1591 kick_rdev_from_array(rdev);
1593 if (!list_empty(&mddev->disks))
1595 mddev->raid_disks = 0;
1596 mddev->major_version = 0;
1599 static void print_desc(mdp_disk_t *desc)
1601 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1602 desc->major,desc->minor,desc->raid_disk,desc->state);
1605 static void print_sb(mdp_super_t *sb)
1610 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1611 sb->major_version, sb->minor_version, sb->patch_version,
1612 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1614 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1615 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1616 sb->md_minor, sb->layout, sb->chunk_size);
1617 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1618 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1619 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1620 sb->failed_disks, sb->spare_disks,
1621 sb->sb_csum, (unsigned long)sb->events_lo);
1624 for (i = 0; i < MD_SB_DISKS; i++) {
1627 desc = sb->disks + i;
1628 if (desc->number || desc->major || desc->minor ||
1629 desc->raid_disk || (desc->state && (desc->state != 4))) {
1630 printk(" D %2d: ", i);
1634 printk(KERN_INFO "md: THIS: ");
1635 print_desc(&sb->this_disk);
1639 static void print_rdev(mdk_rdev_t *rdev)
1641 char b[BDEVNAME_SIZE];
1642 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1643 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1644 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1646 if (rdev->sb_loaded) {
1647 printk(KERN_INFO "md: rdev superblock:\n");
1648 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1650 printk(KERN_INFO "md: no rdev superblock!\n");
1653 static void md_print_devices(void)
1655 struct list_head *tmp, *tmp2;
1658 char b[BDEVNAME_SIZE];
1661 printk("md: **********************************\n");
1662 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1663 printk("md: **********************************\n");
1664 for_each_mddev(mddev, tmp) {
1667 bitmap_print_sb(mddev->bitmap);
1669 printk("%s: ", mdname(mddev));
1670 rdev_for_each(rdev, tmp2, mddev)
1671 printk("<%s>", bdevname(rdev->bdev,b));
1674 rdev_for_each(rdev, tmp2, mddev)
1677 printk("md: **********************************\n");
1682 static void sync_sbs(mddev_t * mddev, int nospares)
1684 /* Update each superblock (in-memory image), but
1685 * if we are allowed to, skip spares which already
1686 * have the right event counter, or have one earlier
1687 * (which would mean they aren't being marked as dirty
1688 * with the rest of the array)
1691 struct list_head *tmp;
1693 rdev_for_each(rdev, tmp, mddev) {
1694 if (rdev->sb_events == mddev->events ||
1696 rdev->raid_disk < 0 &&
1697 (rdev->sb_events&1)==0 &&
1698 rdev->sb_events+1 == mddev->events)) {
1699 /* Don't update this superblock */
1700 rdev->sb_loaded = 2;
1702 super_types[mddev->major_version].
1703 sync_super(mddev, rdev);
1704 rdev->sb_loaded = 1;
1709 static void md_update_sb(mddev_t * mddev, int force_change)
1711 struct list_head *tmp;
1716 if (mddev->external)
1719 spin_lock_irq(&mddev->write_lock);
1721 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1722 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1724 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1725 /* just a clean<-> dirty transition, possibly leave spares alone,
1726 * though if events isn't the right even/odd, we will have to do
1732 if (mddev->degraded)
1733 /* If the array is degraded, then skipping spares is both
1734 * dangerous and fairly pointless.
1735 * Dangerous because a device that was removed from the array
1736 * might have a event_count that still looks up-to-date,
1737 * so it can be re-added without a resync.
1738 * Pointless because if there are any spares to skip,
1739 * then a recovery will happen and soon that array won't
1740 * be degraded any more and the spare can go back to sleep then.
1744 sync_req = mddev->in_sync;
1745 mddev->utime = get_seconds();
1747 /* If this is just a dirty<->clean transition, and the array is clean
1748 * and 'events' is odd, we can roll back to the previous clean state */
1750 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1751 && (mddev->events & 1)
1752 && mddev->events != 1)
1755 /* otherwise we have to go forward and ... */
1757 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1758 /* .. if the array isn't clean, insist on an odd 'events' */
1759 if ((mddev->events&1)==0) {
1764 /* otherwise insist on an even 'events' (for clean states) */
1765 if ((mddev->events&1)) {
1772 if (!mddev->events) {
1774 * oops, this 64-bit counter should never wrap.
1775 * Either we are in around ~1 trillion A.C., assuming
1776 * 1 reboot per second, or we have a bug:
1783 * do not write anything to disk if using
1784 * nonpersistent superblocks
1786 if (!mddev->persistent) {
1787 if (!mddev->external)
1788 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1790 spin_unlock_irq(&mddev->write_lock);
1791 wake_up(&mddev->sb_wait);
1794 sync_sbs(mddev, nospares);
1795 spin_unlock_irq(&mddev->write_lock);
1798 "md: updating %s RAID superblock on device (in sync %d)\n",
1799 mdname(mddev),mddev->in_sync);
1801 bitmap_update_sb(mddev->bitmap);
1802 rdev_for_each(rdev, tmp, mddev) {
1803 char b[BDEVNAME_SIZE];
1804 dprintk(KERN_INFO "md: ");
1805 if (rdev->sb_loaded != 1)
1806 continue; /* no noise on spare devices */
1807 if (test_bit(Faulty, &rdev->flags))
1808 dprintk("(skipping faulty ");
1810 dprintk("%s ", bdevname(rdev->bdev,b));
1811 if (!test_bit(Faulty, &rdev->flags)) {
1812 md_super_write(mddev,rdev,
1813 rdev->sb_offset<<1, rdev->sb_size,
1815 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1816 bdevname(rdev->bdev,b),
1817 (unsigned long long)rdev->sb_offset);
1818 rdev->sb_events = mddev->events;
1822 if (mddev->level == LEVEL_MULTIPATH)
1823 /* only need to write one superblock... */
1826 md_super_wait(mddev);
1827 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1829 spin_lock_irq(&mddev->write_lock);
1830 if (mddev->in_sync != sync_req ||
1831 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1832 /* have to write it out again */
1833 spin_unlock_irq(&mddev->write_lock);
1836 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1837 spin_unlock_irq(&mddev->write_lock);
1838 wake_up(&mddev->sb_wait);
1842 /* words written to sysfs files may, or may not, be \n terminated.
1843 * We want to accept with case. For this we use cmd_match.
1845 static int cmd_match(const char *cmd, const char *str)
1847 /* See if cmd, written into a sysfs file, matches
1848 * str. They must either be the same, or cmd can
1849 * have a trailing newline
1851 while (*cmd && *str && *cmd == *str) {
1862 struct rdev_sysfs_entry {
1863 struct attribute attr;
1864 ssize_t (*show)(mdk_rdev_t *, char *);
1865 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1869 state_show(mdk_rdev_t *rdev, char *page)
1874 if (test_bit(Faulty, &rdev->flags)) {
1875 len+= sprintf(page+len, "%sfaulty",sep);
1878 if (test_bit(In_sync, &rdev->flags)) {
1879 len += sprintf(page+len, "%sin_sync",sep);
1882 if (test_bit(WriteMostly, &rdev->flags)) {
1883 len += sprintf(page+len, "%swrite_mostly",sep);
1886 if (test_bit(Blocked, &rdev->flags)) {
1887 len += sprintf(page+len, "%sblocked", sep);
1890 if (!test_bit(Faulty, &rdev->flags) &&
1891 !test_bit(In_sync, &rdev->flags)) {
1892 len += sprintf(page+len, "%sspare", sep);
1895 return len+sprintf(page+len, "\n");
1899 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1902 * faulty - simulates and error
1903 * remove - disconnects the device
1904 * writemostly - sets write_mostly
1905 * -writemostly - clears write_mostly
1906 * blocked - sets the Blocked flag
1907 * -blocked - clears the Blocked flag
1910 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1911 md_error(rdev->mddev, rdev);
1913 } else if (cmd_match(buf, "remove")) {
1914 if (rdev->raid_disk >= 0)
1917 mddev_t *mddev = rdev->mddev;
1918 kick_rdev_from_array(rdev);
1920 md_update_sb(mddev, 1);
1921 md_new_event(mddev);
1924 } else if (cmd_match(buf, "writemostly")) {
1925 set_bit(WriteMostly, &rdev->flags);
1927 } else if (cmd_match(buf, "-writemostly")) {
1928 clear_bit(WriteMostly, &rdev->flags);
1930 } else if (cmd_match(buf, "blocked")) {
1931 set_bit(Blocked, &rdev->flags);
1933 } else if (cmd_match(buf, "-blocked")) {
1934 clear_bit(Blocked, &rdev->flags);
1935 wake_up(&rdev->blocked_wait);
1936 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1937 md_wakeup_thread(rdev->mddev->thread);
1942 sysfs_notify(&rdev->kobj, NULL, "state");
1943 return err ? err : len;
1945 static struct rdev_sysfs_entry rdev_state =
1946 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1949 errors_show(mdk_rdev_t *rdev, char *page)
1951 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1955 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1958 unsigned long n = simple_strtoul(buf, &e, 10);
1959 if (*buf && (*e == 0 || *e == '\n')) {
1960 atomic_set(&rdev->corrected_errors, n);
1965 static struct rdev_sysfs_entry rdev_errors =
1966 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1969 slot_show(mdk_rdev_t *rdev, char *page)
1971 if (rdev->raid_disk < 0)
1972 return sprintf(page, "none\n");
1974 return sprintf(page, "%d\n", rdev->raid_disk);
1978 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1983 int slot = simple_strtoul(buf, &e, 10);
1984 if (strncmp(buf, "none", 4)==0)
1986 else if (e==buf || (*e && *e!= '\n'))
1988 if (rdev->mddev->pers && slot == -1) {
1989 /* Setting 'slot' on an active array requires also
1990 * updating the 'rd%d' link, and communicating
1991 * with the personality with ->hot_*_disk.
1992 * For now we only support removing
1993 * failed/spare devices. This normally happens automatically,
1994 * but not when the metadata is externally managed.
1996 if (rdev->raid_disk == -1)
1998 /* personality does all needed checks */
1999 if (rdev->mddev->pers->hot_add_disk == NULL)
2001 err = rdev->mddev->pers->
2002 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2005 sprintf(nm, "rd%d", rdev->raid_disk);
2006 sysfs_remove_link(&rdev->mddev->kobj, nm);
2007 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2008 md_wakeup_thread(rdev->mddev->thread);
2009 } else if (rdev->mddev->pers) {
2011 struct list_head *tmp;
2012 /* Activating a spare .. or possibly reactivating
2013 * if we every get bitmaps working here.
2016 if (rdev->raid_disk != -1)
2019 if (rdev->mddev->pers->hot_add_disk == NULL)
2022 rdev_for_each(rdev2, tmp, rdev->mddev)
2023 if (rdev2->raid_disk == slot)
2026 rdev->raid_disk = slot;
2027 if (test_bit(In_sync, &rdev->flags))
2028 rdev->saved_raid_disk = slot;
2030 rdev->saved_raid_disk = -1;
2031 err = rdev->mddev->pers->
2032 hot_add_disk(rdev->mddev, rdev);
2034 rdev->raid_disk = -1;
2037 sysfs_notify(&rdev->kobj, NULL, "state");
2038 sprintf(nm, "rd%d", rdev->raid_disk);
2039 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2041 "md: cannot register "
2043 nm, mdname(rdev->mddev));
2045 /* don't wakeup anyone, leave that to userspace. */
2047 if (slot >= rdev->mddev->raid_disks)
2049 rdev->raid_disk = slot;
2050 /* assume it is working */
2051 clear_bit(Faulty, &rdev->flags);
2052 clear_bit(WriteMostly, &rdev->flags);
2053 set_bit(In_sync, &rdev->flags);
2054 sysfs_notify(&rdev->kobj, NULL, "state");
2060 static struct rdev_sysfs_entry rdev_slot =
2061 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2064 offset_show(mdk_rdev_t *rdev, char *page)
2066 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2070 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2073 unsigned long long offset = simple_strtoull(buf, &e, 10);
2074 if (e==buf || (*e && *e != '\n'))
2076 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2078 if (rdev->size && rdev->mddev->external)
2079 /* Must set offset before size, so overlap checks
2082 rdev->data_offset = offset;
2086 static struct rdev_sysfs_entry rdev_offset =
2087 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2090 rdev_size_show(mdk_rdev_t *rdev, char *page)
2092 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2095 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2097 /* check if two start/length pairs overlap */
2106 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2109 unsigned long long size = simple_strtoull(buf, &e, 10);
2110 unsigned long long oldsize = rdev->size;
2111 mddev_t *my_mddev = rdev->mddev;
2113 if (e==buf || (*e && *e != '\n'))
2115 if (my_mddev->pers && rdev->raid_disk >= 0) {
2116 if (rdev->mddev->persistent) {
2117 size = super_types[rdev->mddev->major_version].
2118 rdev_size_change(rdev, size);
2122 size = (rdev->bdev->bd_inode->i_size >> 10);
2123 size -= rdev->data_offset/2;
2125 if (size < rdev->mddev->size)
2126 return -EINVAL; /* component must fit device */
2130 if (size > oldsize && rdev->mddev->external) {
2131 /* need to check that all other rdevs with the same ->bdev
2132 * do not overlap. We need to unlock the mddev to avoid
2133 * a deadlock. We have already changed rdev->size, and if
2134 * we have to change it back, we will have the lock again.
2138 struct list_head *tmp, *tmp2;
2140 mddev_unlock(my_mddev);
2141 for_each_mddev(mddev, tmp) {
2145 rdev_for_each(rdev2, tmp2, mddev)
2146 if (test_bit(AllReserved, &rdev2->flags) ||
2147 (rdev->bdev == rdev2->bdev &&
2149 overlaps(rdev->data_offset, rdev->size,
2150 rdev2->data_offset, rdev2->size))) {
2154 mddev_unlock(mddev);
2160 mddev_lock(my_mddev);
2162 /* Someone else could have slipped in a size
2163 * change here, but doing so is just silly.
2164 * We put oldsize back because we *know* it is
2165 * safe, and trust userspace not to race with
2168 rdev->size = oldsize;
2172 if (size < my_mddev->size || my_mddev->size == 0)
2173 my_mddev->size = size;
2177 static struct rdev_sysfs_entry rdev_size =
2178 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2180 static struct attribute *rdev_default_attrs[] = {
2189 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2191 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2192 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2193 mddev_t *mddev = rdev->mddev;
2199 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2201 if (rdev->mddev == NULL)
2204 rv = entry->show(rdev, page);
2205 mddev_unlock(mddev);
2211 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2212 const char *page, size_t length)
2214 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2215 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2217 mddev_t *mddev = rdev->mddev;
2221 if (!capable(CAP_SYS_ADMIN))
2223 rv = mddev ? mddev_lock(mddev): -EBUSY;
2225 if (rdev->mddev == NULL)
2228 rv = entry->store(rdev, page, length);
2229 mddev_unlock(mddev);
2234 static void rdev_free(struct kobject *ko)
2236 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2239 static struct sysfs_ops rdev_sysfs_ops = {
2240 .show = rdev_attr_show,
2241 .store = rdev_attr_store,
2243 static struct kobj_type rdev_ktype = {
2244 .release = rdev_free,
2245 .sysfs_ops = &rdev_sysfs_ops,
2246 .default_attrs = rdev_default_attrs,
2250 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2252 * mark the device faulty if:
2254 * - the device is nonexistent (zero size)
2255 * - the device has no valid superblock
2257 * a faulty rdev _never_ has rdev->sb set.
2259 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2261 char b[BDEVNAME_SIZE];
2266 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2268 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2269 return ERR_PTR(-ENOMEM);
2272 if ((err = alloc_disk_sb(rdev)))
2275 err = lock_rdev(rdev, newdev, super_format == -2);
2279 kobject_init(&rdev->kobj, &rdev_ktype);
2282 rdev->saved_raid_disk = -1;
2283 rdev->raid_disk = -1;
2285 rdev->data_offset = 0;
2286 rdev->sb_events = 0;
2287 atomic_set(&rdev->nr_pending, 0);
2288 atomic_set(&rdev->read_errors, 0);
2289 atomic_set(&rdev->corrected_errors, 0);
2291 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2294 "md: %s has zero or unknown size, marking faulty!\n",
2295 bdevname(rdev->bdev,b));
2300 if (super_format >= 0) {
2301 err = super_types[super_format].
2302 load_super(rdev, NULL, super_minor);
2303 if (err == -EINVAL) {
2305 "md: %s does not have a valid v%d.%d "
2306 "superblock, not importing!\n",
2307 bdevname(rdev->bdev,b),
2308 super_format, super_minor);
2313 "md: could not read %s's sb, not importing!\n",
2314 bdevname(rdev->bdev,b));
2319 INIT_LIST_HEAD(&rdev->same_set);
2320 init_waitqueue_head(&rdev->blocked_wait);
2325 if (rdev->sb_page) {
2331 return ERR_PTR(err);
2335 * Check a full RAID array for plausibility
2339 static void analyze_sbs(mddev_t * mddev)
2342 struct list_head *tmp;
2343 mdk_rdev_t *rdev, *freshest;
2344 char b[BDEVNAME_SIZE];
2347 rdev_for_each(rdev, tmp, mddev)
2348 switch (super_types[mddev->major_version].
2349 load_super(rdev, freshest, mddev->minor_version)) {
2357 "md: fatal superblock inconsistency in %s"
2358 " -- removing from array\n",
2359 bdevname(rdev->bdev,b));
2360 kick_rdev_from_array(rdev);
2364 super_types[mddev->major_version].
2365 validate_super(mddev, freshest);
2368 rdev_for_each(rdev, tmp, mddev) {
2369 if (rdev != freshest)
2370 if (super_types[mddev->major_version].
2371 validate_super(mddev, rdev)) {
2372 printk(KERN_WARNING "md: kicking non-fresh %s"
2374 bdevname(rdev->bdev,b));
2375 kick_rdev_from_array(rdev);
2378 if (mddev->level == LEVEL_MULTIPATH) {
2379 rdev->desc_nr = i++;
2380 rdev->raid_disk = rdev->desc_nr;
2381 set_bit(In_sync, &rdev->flags);
2382 } else if (rdev->raid_disk >= mddev->raid_disks) {
2383 rdev->raid_disk = -1;
2384 clear_bit(In_sync, &rdev->flags);
2390 if (mddev->recovery_cp != MaxSector &&
2392 printk(KERN_ERR "md: %s: raid array is not clean"
2393 " -- starting background reconstruction\n",
2399 safe_delay_show(mddev_t *mddev, char *page)
2401 int msec = (mddev->safemode_delay*1000)/HZ;
2402 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2405 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2413 /* remove a period, and count digits after it */
2414 if (len >= sizeof(buf))
2416 strlcpy(buf, cbuf, len);
2418 for (i=0; i<len; i++) {
2420 if (isdigit(buf[i])) {
2425 } else if (buf[i] == '.') {
2430 msec = simple_strtoul(buf, &e, 10);
2431 if (e == buf || (*e && *e != '\n'))
2433 msec = (msec * 1000) / scale;
2435 mddev->safemode_delay = 0;
2437 mddev->safemode_delay = (msec*HZ)/1000;
2438 if (mddev->safemode_delay == 0)
2439 mddev->safemode_delay = 1;
2443 static struct md_sysfs_entry md_safe_delay =
2444 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2447 level_show(mddev_t *mddev, char *page)
2449 struct mdk_personality *p = mddev->pers;
2451 return sprintf(page, "%s\n", p->name);
2452 else if (mddev->clevel[0])
2453 return sprintf(page, "%s\n", mddev->clevel);
2454 else if (mddev->level != LEVEL_NONE)
2455 return sprintf(page, "%d\n", mddev->level);
2461 level_store(mddev_t *mddev, const char *buf, size_t len)
2468 if (len >= sizeof(mddev->clevel))
2470 strncpy(mddev->clevel, buf, len);
2471 if (mddev->clevel[len-1] == '\n')
2473 mddev->clevel[len] = 0;
2474 mddev->level = LEVEL_NONE;
2478 static struct md_sysfs_entry md_level =
2479 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2483 layout_show(mddev_t *mddev, char *page)
2485 /* just a number, not meaningful for all levels */
2486 if (mddev->reshape_position != MaxSector &&
2487 mddev->layout != mddev->new_layout)
2488 return sprintf(page, "%d (%d)\n",
2489 mddev->new_layout, mddev->layout);
2490 return sprintf(page, "%d\n", mddev->layout);
2494 layout_store(mddev_t *mddev, const char *buf, size_t len)
2497 unsigned long n = simple_strtoul(buf, &e, 10);
2499 if (!*buf || (*e && *e != '\n'))
2504 if (mddev->reshape_position != MaxSector)
2505 mddev->new_layout = n;
2510 static struct md_sysfs_entry md_layout =
2511 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2515 raid_disks_show(mddev_t *mddev, char *page)
2517 if (mddev->raid_disks == 0)
2519 if (mddev->reshape_position != MaxSector &&
2520 mddev->delta_disks != 0)
2521 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2522 mddev->raid_disks - mddev->delta_disks);
2523 return sprintf(page, "%d\n", mddev->raid_disks);
2526 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2529 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2533 unsigned long n = simple_strtoul(buf, &e, 10);
2535 if (!*buf || (*e && *e != '\n'))
2539 rv = update_raid_disks(mddev, n);
2540 else if (mddev->reshape_position != MaxSector) {
2541 int olddisks = mddev->raid_disks - mddev->delta_disks;
2542 mddev->delta_disks = n - olddisks;
2543 mddev->raid_disks = n;
2545 mddev->raid_disks = n;
2546 return rv ? rv : len;
2548 static struct md_sysfs_entry md_raid_disks =
2549 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2552 chunk_size_show(mddev_t *mddev, char *page)
2554 if (mddev->reshape_position != MaxSector &&
2555 mddev->chunk_size != mddev->new_chunk)
2556 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2558 return sprintf(page, "%d\n", mddev->chunk_size);
2562 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2564 /* can only set chunk_size if array is not yet active */
2566 unsigned long n = simple_strtoul(buf, &e, 10);
2568 if (!*buf || (*e && *e != '\n'))
2573 else if (mddev->reshape_position != MaxSector)
2574 mddev->new_chunk = n;
2576 mddev->chunk_size = n;
2579 static struct md_sysfs_entry md_chunk_size =
2580 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2583 resync_start_show(mddev_t *mddev, char *page)
2585 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2589 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2592 unsigned long long n = simple_strtoull(buf, &e, 10);
2596 if (!*buf || (*e && *e != '\n'))
2599 mddev->recovery_cp = n;
2602 static struct md_sysfs_entry md_resync_start =
2603 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2606 * The array state can be:
2609 * No devices, no size, no level
2610 * Equivalent to STOP_ARRAY ioctl
2612 * May have some settings, but array is not active
2613 * all IO results in error
2614 * When written, doesn't tear down array, but just stops it
2615 * suspended (not supported yet)
2616 * All IO requests will block. The array can be reconfigured.
2617 * Writing this, if accepted, will block until array is quiescent
2619 * no resync can happen. no superblocks get written.
2620 * write requests fail
2622 * like readonly, but behaves like 'clean' on a write request.
2624 * clean - no pending writes, but otherwise active.
2625 * When written to inactive array, starts without resync
2626 * If a write request arrives then
2627 * if metadata is known, mark 'dirty' and switch to 'active'.
2628 * if not known, block and switch to write-pending
2629 * If written to an active array that has pending writes, then fails.
2631 * fully active: IO and resync can be happening.
2632 * When written to inactive array, starts with resync
2635 * clean, but writes are blocked waiting for 'active' to be written.
2638 * like active, but no writes have been seen for a while (100msec).
2641 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2642 write_pending, active_idle, bad_word};
2643 static char *array_states[] = {
2644 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2645 "write-pending", "active-idle", NULL };
2647 static int match_word(const char *word, char **list)
2650 for (n=0; list[n]; n++)
2651 if (cmd_match(word, list[n]))
2657 array_state_show(mddev_t *mddev, char *page)
2659 enum array_state st = inactive;
2672 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2674 else if (mddev->safemode)
2680 if (list_empty(&mddev->disks) &&
2681 mddev->raid_disks == 0 &&
2687 return sprintf(page, "%s\n", array_states[st]);
2690 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
2691 static int do_md_run(mddev_t * mddev);
2692 static int restart_array(mddev_t *mddev);
2695 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2698 enum array_state st = match_word(buf, array_states);
2703 /* stopping an active array */
2704 if (atomic_read(&mddev->active) > 1)
2706 err = do_md_stop(mddev, 0, 0);
2709 /* stopping an active array */
2711 if (atomic_read(&mddev->active) > 1)
2713 err = do_md_stop(mddev, 2, 0);
2715 err = 0; /* already inactive */
2718 break; /* not supported yet */
2721 err = do_md_stop(mddev, 1, 0);
2724 set_disk_ro(mddev->gendisk, 1);
2725 err = do_md_run(mddev);
2731 err = do_md_stop(mddev, 1, 0);
2733 err = restart_array(mddev);
2736 set_disk_ro(mddev->gendisk, 0);
2740 err = do_md_run(mddev);
2745 restart_array(mddev);
2746 spin_lock_irq(&mddev->write_lock);
2747 if (atomic_read(&mddev->writes_pending) == 0) {
2748 if (mddev->in_sync == 0) {
2750 if (mddev->safemode == 1)
2751 mddev->safemode = 0;
2752 if (mddev->persistent)
2753 set_bit(MD_CHANGE_CLEAN,
2759 spin_unlock_irq(&mddev->write_lock);
2762 mddev->recovery_cp = MaxSector;
2763 err = do_md_run(mddev);
2768 restart_array(mddev);
2769 if (mddev->external)
2770 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2771 wake_up(&mddev->sb_wait);
2775 set_disk_ro(mddev->gendisk, 0);
2776 err = do_md_run(mddev);
2781 /* these cannot be set */
2787 sysfs_notify(&mddev->kobj, NULL, "array_state");
2791 static struct md_sysfs_entry md_array_state =
2792 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2795 null_show(mddev_t *mddev, char *page)
2801 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2803 /* buf must be %d:%d\n? giving major and minor numbers */
2804 /* The new device is added to the array.
2805 * If the array has a persistent superblock, we read the
2806 * superblock to initialise info and check validity.
2807 * Otherwise, only checking done is that in bind_rdev_to_array,
2808 * which mainly checks size.
2811 int major = simple_strtoul(buf, &e, 10);
2817 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2819 minor = simple_strtoul(e+1, &e, 10);
2820 if (*e && *e != '\n')
2822 dev = MKDEV(major, minor);
2823 if (major != MAJOR(dev) ||
2824 minor != MINOR(dev))
2828 if (mddev->persistent) {
2829 rdev = md_import_device(dev, mddev->major_version,
2830 mddev->minor_version);
2831 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2832 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2833 mdk_rdev_t, same_set);
2834 err = super_types[mddev->major_version]
2835 .load_super(rdev, rdev0, mddev->minor_version);
2839 } else if (mddev->external)
2840 rdev = md_import_device(dev, -2, -1);
2842 rdev = md_import_device(dev, -1, -1);
2845 return PTR_ERR(rdev);
2846 err = bind_rdev_to_array(rdev, mddev);
2850 return err ? err : len;
2853 static struct md_sysfs_entry md_new_device =
2854 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2857 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2860 unsigned long chunk, end_chunk;
2864 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2866 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2867 if (buf == end) break;
2868 if (*end == '-') { /* range */
2870 end_chunk = simple_strtoul(buf, &end, 0);
2871 if (buf == end) break;
2873 if (*end && !isspace(*end)) break;
2874 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2876 while (isspace(*buf)) buf++;
2878 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2883 static struct md_sysfs_entry md_bitmap =
2884 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2887 size_show(mddev_t *mddev, char *page)
2889 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2892 static int update_size(mddev_t *mddev, sector_t num_sectors);
2895 size_store(mddev_t *mddev, const char *buf, size_t len)
2897 /* If array is inactive, we can reduce the component size, but
2898 * not increase it (except from 0).
2899 * If array is active, we can try an on-line resize
2903 unsigned long long size = simple_strtoull(buf, &e, 10);
2904 if (!*buf || *buf == '\n' ||
2909 err = update_size(mddev, size * 2);
2910 md_update_sb(mddev, 1);
2912 if (mddev->size == 0 ||
2918 return err ? err : len;
2921 static struct md_sysfs_entry md_size =
2922 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2927 * 'none' for arrays with no metadata (good luck...)
2928 * 'external' for arrays with externally managed metadata,
2929 * or N.M for internally known formats
2932 metadata_show(mddev_t *mddev, char *page)
2934 if (mddev->persistent)
2935 return sprintf(page, "%d.%d\n",
2936 mddev->major_version, mddev->minor_version);
2937 else if (mddev->external)
2938 return sprintf(page, "external:%s\n", mddev->metadata_type);
2940 return sprintf(page, "none\n");
2944 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2948 if (!list_empty(&mddev->disks))
2951 if (cmd_match(buf, "none")) {
2952 mddev->persistent = 0;
2953 mddev->external = 0;
2954 mddev->major_version = 0;
2955 mddev->minor_version = 90;
2958 if (strncmp(buf, "external:", 9) == 0) {
2959 size_t namelen = len-9;
2960 if (namelen >= sizeof(mddev->metadata_type))
2961 namelen = sizeof(mddev->metadata_type)-1;
2962 strncpy(mddev->metadata_type, buf+9, namelen);
2963 mddev->metadata_type[namelen] = 0;
2964 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2965 mddev->metadata_type[--namelen] = 0;
2966 mddev->persistent = 0;
2967 mddev->external = 1;
2968 mddev->major_version = 0;
2969 mddev->minor_version = 90;
2972 major = simple_strtoul(buf, &e, 10);
2973 if (e==buf || *e != '.')
2976 minor = simple_strtoul(buf, &e, 10);
2977 if (e==buf || (*e && *e != '\n') )
2979 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2981 mddev->major_version = major;
2982 mddev->minor_version = minor;
2983 mddev->persistent = 1;
2984 mddev->external = 0;
2988 static struct md_sysfs_entry md_metadata =
2989 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2992 action_show(mddev_t *mddev, char *page)
2994 char *type = "idle";
2995 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2996 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2997 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2999 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3000 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3002 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3006 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3009 return sprintf(page, "%s\n", type);
3013 action_store(mddev_t *mddev, const char *page, size_t len)
3015 if (!mddev->pers || !mddev->pers->sync_request)
3018 if (cmd_match(page, "idle")) {
3019 if (mddev->sync_thread) {
3020 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3021 md_unregister_thread(mddev->sync_thread);
3022 mddev->sync_thread = NULL;
3023 mddev->recovery = 0;
3025 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3026 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3028 else if (cmd_match(page, "resync"))
3029 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3030 else if (cmd_match(page, "recover")) {
3031 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3032 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3033 } else if (cmd_match(page, "reshape")) {
3035 if (mddev->pers->start_reshape == NULL)
3037 err = mddev->pers->start_reshape(mddev);
3040 sysfs_notify(&mddev->kobj, NULL, "degraded");
3042 if (cmd_match(page, "check"))
3043 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3044 else if (!cmd_match(page, "repair"))
3046 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3047 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3049 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3050 md_wakeup_thread(mddev->thread);
3051 sysfs_notify(&mddev->kobj, NULL, "sync_action");
3056 mismatch_cnt_show(mddev_t *mddev, char *page)
3058 return sprintf(page, "%llu\n",
3059 (unsigned long long) mddev->resync_mismatches);
3062 static struct md_sysfs_entry md_scan_mode =
3063 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3066 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3069 sync_min_show(mddev_t *mddev, char *page)
3071 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3072 mddev->sync_speed_min ? "local": "system");
3076 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3080 if (strncmp(buf, "system", 6)==0) {
3081 mddev->sync_speed_min = 0;
3084 min = simple_strtoul(buf, &e, 10);
3085 if (buf == e || (*e && *e != '\n') || min <= 0)
3087 mddev->sync_speed_min = min;
3091 static struct md_sysfs_entry md_sync_min =
3092 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3095 sync_max_show(mddev_t *mddev, char *page)
3097 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3098 mddev->sync_speed_max ? "local": "system");
3102 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3106 if (strncmp(buf, "system", 6)==0) {
3107 mddev->sync_speed_max = 0;
3110 max = simple_strtoul(buf, &e, 10);
3111 if (buf == e || (*e && *e != '\n') || max <= 0)
3113 mddev->sync_speed_max = max;
3117 static struct md_sysfs_entry md_sync_max =
3118 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3121 degraded_show(mddev_t *mddev, char *page)
3123 return sprintf(page, "%d\n", mddev->degraded);
3125 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3128 sync_force_parallel_show(mddev_t *mddev, char *page)
3130 return sprintf(page, "%d\n", mddev->parallel_resync);
3134 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3138 if (strict_strtol(buf, 10, &n))
3141 if (n != 0 && n != 1)
3144 mddev->parallel_resync = n;
3146 if (mddev->sync_thread)
3147 wake_up(&resync_wait);
3152 /* force parallel resync, even with shared block devices */
3153 static struct md_sysfs_entry md_sync_force_parallel =
3154 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3155 sync_force_parallel_show, sync_force_parallel_store);
3158 sync_speed_show(mddev_t *mddev, char *page)
3160 unsigned long resync, dt, db;
3161 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3162 dt = (jiffies - mddev->resync_mark) / HZ;
3164 db = resync - mddev->resync_mark_cnt;
3165 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3168 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3171 sync_completed_show(mddev_t *mddev, char *page)
3173 unsigned long max_blocks, resync;
3175 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3176 max_blocks = mddev->resync_max_sectors;
3178 max_blocks = mddev->size << 1;
3180 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3181 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3184 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3187 min_sync_show(mddev_t *mddev, char *page)
3189 return sprintf(page, "%llu\n",
3190 (unsigned long long)mddev->resync_min);
3193 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3195 unsigned long long min;
3196 if (strict_strtoull(buf, 10, &min))
3198 if (min > mddev->resync_max)
3200 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3203 /* Must be a multiple of chunk_size */
3204 if (mddev->chunk_size) {
3205 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3208 mddev->resync_min = min;
3213 static struct md_sysfs_entry md_min_sync =
3214 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3217 max_sync_show(mddev_t *mddev, char *page)
3219 if (mddev->resync_max == MaxSector)
3220 return sprintf(page, "max\n");
3222 return sprintf(page, "%llu\n",
3223 (unsigned long long)mddev->resync_max);
3226 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3228 if (strncmp(buf, "max", 3) == 0)
3229 mddev->resync_max = MaxSector;
3231 unsigned long long max;
3232 if (strict_strtoull(buf, 10, &max))
3234 if (max < mddev->resync_min)
3236 if (max < mddev->resync_max &&
3237 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3240 /* Must be a multiple of chunk_size */
3241 if (mddev->chunk_size) {
3242 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3245 mddev->resync_max = max;
3247 wake_up(&mddev->recovery_wait);
3251 static struct md_sysfs_entry md_max_sync =
3252 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3255 suspend_lo_show(mddev_t *mddev, char *page)
3257 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3261 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3264 unsigned long long new = simple_strtoull(buf, &e, 10);
3266 if (mddev->pers->quiesce == NULL)
3268 if (buf == e || (*e && *e != '\n'))
3270 if (new >= mddev->suspend_hi ||
3271 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3272 mddev->suspend_lo = new;
3273 mddev->pers->quiesce(mddev, 2);
3278 static struct md_sysfs_entry md_suspend_lo =
3279 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3283 suspend_hi_show(mddev_t *mddev, char *page)
3285 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3289 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3292 unsigned long long new = simple_strtoull(buf, &e, 10);
3294 if (mddev->pers->quiesce == NULL)
3296 if (buf == e || (*e && *e != '\n'))
3298 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3299 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3300 mddev->suspend_hi = new;
3301 mddev->pers->quiesce(mddev, 1);
3302 mddev->pers->quiesce(mddev, 0);
3307 static struct md_sysfs_entry md_suspend_hi =
3308 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3311 reshape_position_show(mddev_t *mddev, char *page)
3313 if (mddev->reshape_position != MaxSector)
3314 return sprintf(page, "%llu\n",
3315 (unsigned long long)mddev->reshape_position);
3316 strcpy(page, "none\n");
3321 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3324 unsigned long long new = simple_strtoull(buf, &e, 10);
3327 if (buf == e || (*e && *e != '\n'))
3329 mddev->reshape_position = new;
3330 mddev->delta_disks = 0;
3331 mddev->new_level = mddev->level;
3332 mddev->new_layout = mddev->layout;
3333 mddev->new_chunk = mddev->chunk_size;
3337 static struct md_sysfs_entry md_reshape_position =
3338 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3339 reshape_position_store);
3342 static struct attribute *md_default_attrs[] = {
3345 &md_raid_disks.attr,
3346 &md_chunk_size.attr,
3348 &md_resync_start.attr,
3350 &md_new_device.attr,
3351 &md_safe_delay.attr,
3352 &md_array_state.attr,
3353 &md_reshape_position.attr,
3357 static struct attribute *md_redundancy_attrs[] = {
3359 &md_mismatches.attr,
3362 &md_sync_speed.attr,
3363 &md_sync_force_parallel.attr,
3364 &md_sync_completed.attr,
3367 &md_suspend_lo.attr,
3368 &md_suspend_hi.attr,
3373 static struct attribute_group md_redundancy_group = {
3375 .attrs = md_redundancy_attrs,
3380 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3382 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3383 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3388 rv = mddev_lock(mddev);
3390 rv = entry->show(mddev, page);
3391 mddev_unlock(mddev);
3397 md_attr_store(struct kobject *kobj, struct attribute *attr,
3398 const char *page, size_t length)
3400 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3401 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3406 if (!capable(CAP_SYS_ADMIN))
3408 rv = mddev_lock(mddev);
3410 rv = entry->store(mddev, page, length);
3411 mddev_unlock(mddev);
3416 static void md_free(struct kobject *ko)
3418 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3422 static struct sysfs_ops md_sysfs_ops = {
3423 .show = md_attr_show,
3424 .store = md_attr_store,
3426 static struct kobj_type md_ktype = {
3428 .sysfs_ops = &md_sysfs_ops,
3429 .default_attrs = md_default_attrs,
3434 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3436 static DEFINE_MUTEX(disks_mutex);
3437 mddev_t *mddev = mddev_find(dev);
3438 struct gendisk *disk;
3439 int partitioned = (MAJOR(dev) != MD_MAJOR);
3440 int shift = partitioned ? MdpMinorShift : 0;
3441 int unit = MINOR(dev) >> shift;
3447 mutex_lock(&disks_mutex);
3448 if (mddev->gendisk) {
3449 mutex_unlock(&disks_mutex);
3453 disk = alloc_disk(1 << shift);
3455 mutex_unlock(&disks_mutex);
3459 disk->major = MAJOR(dev);
3460 disk->first_minor = unit << shift;
3462 sprintf(disk->disk_name, "md_d%d", unit);
3464 sprintf(disk->disk_name, "md%d", unit);
3465 disk->fops = &md_fops;
3466 disk->private_data = mddev;
3467 disk->queue = mddev->queue;
3469 mddev->gendisk = disk;
3470 error = kobject_init_and_add(&mddev->kobj, &md_ktype, &disk->dev.kobj,
3472 mutex_unlock(&disks_mutex);
3474 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3477 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3481 static void md_safemode_timeout(unsigned long data)
3483 mddev_t *mddev = (mddev_t *) data;
3485 if (!atomic_read(&mddev->writes_pending)) {
3486 mddev->safemode = 1;
3487 if (mddev->external)
3488 sysfs_notify(&mddev->kobj, NULL, "array_state");
3490 md_wakeup_thread(mddev->thread);
3493 static int start_dirty_degraded;
3495 static int do_md_run(mddev_t * mddev)
3499 struct list_head *tmp;
3501 struct gendisk *disk;
3502 struct mdk_personality *pers;
3503 char b[BDEVNAME_SIZE];
3505 if (list_empty(&mddev->disks))
3506 /* cannot run an array with no devices.. */
3513 * Analyze all RAID superblock(s)
3515 if (!mddev->raid_disks) {
3516 if (!mddev->persistent)
3521 chunk_size = mddev->chunk_size;
3524 if (chunk_size > MAX_CHUNK_SIZE) {
3525 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3526 chunk_size, MAX_CHUNK_SIZE);
3530 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
3532 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3533 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3536 if (chunk_size < PAGE_SIZE) {
3537 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
3538 chunk_size, PAGE_SIZE);
3542 /* devices must have minimum size of one chunk */
3543 rdev_for_each(rdev, tmp, mddev) {
3544 if (test_bit(Faulty, &rdev->flags))
3546 if (rdev->size < chunk_size / 1024) {
3548 "md: Dev %s smaller than chunk_size:"
3550 bdevname(rdev->bdev,b),
3551 (unsigned long long)rdev->size,
3559 if (mddev->level != LEVEL_NONE)
3560 request_module("md-level-%d", mddev->level);
3561 else if (mddev->clevel[0])
3562 request_module("md-%s", mddev->clevel);
3566 * Drop all container device buffers, from now on
3567 * the only valid external interface is through the md
3570 rdev_for_each(rdev, tmp, mddev) {
3571 if (test_bit(Faulty, &rdev->flags))
3573 sync_blockdev(rdev->bdev);
3574 invalidate_bdev(rdev->bdev);
3576 /* perform some consistency tests on the device.
3577 * We don't want the data to overlap the metadata,
3578 * Internal Bitmap issues has handled elsewhere.
3580 if (rdev->data_offset < rdev->sb_offset) {
3582 rdev->data_offset + mddev->size*2
3583 > rdev->sb_offset*2) {
3584 printk("md: %s: data overlaps metadata\n",
3589 if (rdev->sb_offset*2 + rdev->sb_size/512
3590 > rdev->data_offset) {
3591 printk("md: %s: metadata overlaps data\n",
3596 sysfs_notify(&rdev->kobj, NULL, "state");
3599 md_probe(mddev->unit, NULL, NULL);
3600 disk = mddev->gendisk;
3604 spin_lock(&pers_lock);
3605 pers = find_pers(mddev->level, mddev->clevel);
3606 if (!pers || !try_module_get(pers->owner)) {
3607 spin_unlock(&pers_lock);
3608 if (mddev->level != LEVEL_NONE)
3609 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3612 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3617 spin_unlock(&pers_lock);
3618 mddev->level = pers->level;
3619 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3621 if (mddev->reshape_position != MaxSector &&
3622 pers->start_reshape == NULL) {
3623 /* This personality cannot handle reshaping... */
3625 module_put(pers->owner);
3629 if (pers->sync_request) {
3630 /* Warn if this is a potentially silly
3633 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3635 struct list_head *tmp2;
3637 rdev_for_each(rdev, tmp, mddev) {
3638 rdev_for_each(rdev2, tmp2, mddev) {
3640 rdev->bdev->bd_contains ==
3641 rdev2->bdev->bd_contains) {
3643 "%s: WARNING: %s appears to be"
3644 " on the same physical disk as"
3647 bdevname(rdev->bdev,b),
3648 bdevname(rdev2->bdev,b2));
3655 "True protection against single-disk"
3656 " failure might be compromised.\n");
3659 mddev->recovery = 0;
3660 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3661 mddev->barriers_work = 1;
3662 mddev->ok_start_degraded = start_dirty_degraded;
3665 mddev->ro = 2; /* read-only, but switch on first write */
3667 err = mddev->pers->run(mddev);
3669 printk(KERN_ERR "md: pers->run() failed ...\n");
3670 else if (mddev->pers->sync_request) {
3671 err = bitmap_create(mddev);
3673 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3674 mdname(mddev), err);
3675 mddev->pers->stop(mddev);
3679 module_put(mddev->pers->owner);
3681 bitmap_destroy(mddev);
3684 if (mddev->pers->sync_request) {
3685 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3687 "md: cannot register extra attributes for %s\n",
3689 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3692 atomic_set(&mddev->writes_pending,0);
3693 mddev->safemode = 0;
3694 mddev->safemode_timer.function = md_safemode_timeout;
3695 mddev->safemode_timer.data = (unsigned long) mddev;
3696 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3699 rdev_for_each(rdev, tmp, mddev)
3700 if (rdev->raid_disk >= 0) {
3702 sprintf(nm, "rd%d", rdev->raid_disk);
3703 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3704 printk("md: cannot register %s for %s\n",
3708 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3711 md_update_sb(mddev, 0);
3713 set_capacity(disk, mddev->array_size<<1);
3715 /* If we call blk_queue_make_request here, it will
3716 * re-initialise max_sectors etc which may have been
3717 * refined inside -> run. So just set the bits we need to set.
3718 * Most initialisation happended when we called
3719 * blk_queue_make_request(..., md_fail_request)
3722 mddev->queue->queuedata = mddev;
3723 mddev->queue->make_request_fn = mddev->pers->make_request;
3725 /* If there is a partially-recovered drive we need to
3726 * start recovery here. If we leave it to md_check_recovery,
3727 * it will remove the drives and not do the right thing
3729 if (mddev->degraded && !mddev->sync_thread) {
3730 struct list_head *rtmp;
3732 rdev_for_each(rdev, rtmp, mddev)
3733 if (rdev->raid_disk >= 0 &&
3734 !test_bit(In_sync, &rdev->flags) &&
3735 !test_bit(Faulty, &rdev->flags))
3736 /* complete an interrupted recovery */
3738 if (spares && mddev->pers->sync_request) {
3739 mddev->recovery = 0;
3740 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3741 mddev->sync_thread = md_register_thread(md_do_sync,
3744 if (!mddev->sync_thread) {
3745 printk(KERN_ERR "%s: could not start resync"
3748 /* leave the spares where they are, it shouldn't hurt */
3749 mddev->recovery = 0;
3753 md_wakeup_thread(mddev->thread);
3754 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3757 md_new_event(mddev);
3758 sysfs_notify(&mddev->kobj, NULL, "array_state");
3759 sysfs_notify(&mddev->kobj, NULL, "sync_action");
3760 sysfs_notify(&mddev->kobj, NULL, "degraded");
3761 kobject_uevent(&mddev->gendisk->dev.kobj, KOBJ_CHANGE);
3765 static int restart_array(mddev_t *mddev)
3767 struct gendisk *disk = mddev->gendisk;
3769 /* Complain if it has no devices */
3770 if (list_empty(&mddev->disks))
3776 mddev->safemode = 0;
3778 set_disk_ro(disk, 0);
3779 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3781 /* Kick recovery or resync if necessary */
3782 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3783 md_wakeup_thread(mddev->thread);
3784 md_wakeup_thread(mddev->sync_thread);
3785 sysfs_notify(&mddev->kobj, NULL, "array_state");
3789 /* similar to deny_write_access, but accounts for our holding a reference
3790 * to the file ourselves */
3791 static int deny_bitmap_write_access(struct file * file)
3793 struct inode *inode = file->f_mapping->host;
3795 spin_lock(&inode->i_lock);
3796 if (atomic_read(&inode->i_writecount) > 1) {
3797 spin_unlock(&inode->i_lock);
3800 atomic_set(&inode->i_writecount, -1);
3801 spin_unlock(&inode->i_lock);
3806 static void restore_bitmap_write_access(struct file *file)
3808 struct inode *inode = file->f_mapping->host;
3810 spin_lock(&inode->i_lock);
3811 atomic_set(&inode->i_writecount, 1);
3812 spin_unlock(&inode->i_lock);
3816 * 0 - completely stop and dis-assemble array
3817 * 1 - switch to readonly
3818 * 2 - stop but do not disassemble array
3820 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
3823 struct gendisk *disk = mddev->gendisk;
3825 if (atomic_read(&mddev->active) > 1 + is_open) {
3826 printk("md: %s still in use.\n",mdname(mddev));
3832 if (mddev->sync_thread) {
3833 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3834 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3835 md_unregister_thread(mddev->sync_thread);
3836 mddev->sync_thread = NULL;
3839 del_timer_sync(&mddev->safemode_timer);
3841 invalidate_partition(disk, 0);
3844 case 1: /* readonly */
3850 case 0: /* disassemble */
3852 bitmap_flush(mddev);
3853 md_super_wait(mddev);
3855 set_disk_ro(disk, 0);
3856 blk_queue_make_request(mddev->queue, md_fail_request);
3857 mddev->pers->stop(mddev);
3858 mddev->queue->merge_bvec_fn = NULL;
3859 mddev->queue->unplug_fn = NULL;
3860 mddev->queue->backing_dev_info.congested_fn = NULL;
3861 if (mddev->pers->sync_request)
3862 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3864 module_put(mddev->pers->owner);
3866 /* tell userspace to handle 'inactive' */
3867 sysfs_notify(&mddev->kobj, NULL, "array_state");
3869 set_capacity(disk, 0);
3875 if (!mddev->in_sync || mddev->flags) {
3876 /* mark array as shutdown cleanly */
3878 md_update_sb(mddev, 1);
3881 set_disk_ro(disk, 1);
3882 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3886 * Free resources if final stop
3890 struct list_head *tmp;
3892 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3894 bitmap_destroy(mddev);
3895 if (mddev->bitmap_file) {
3896 restore_bitmap_write_access(mddev->bitmap_file);
3897 fput(mddev->bitmap_file);
3898 mddev->bitmap_file = NULL;
3900 mddev->bitmap_offset = 0;
3902 rdev_for_each(rdev, tmp, mddev)
3903 if (rdev->raid_disk >= 0) {
3905 sprintf(nm, "rd%d", rdev->raid_disk);
3906 sysfs_remove_link(&mddev->kobj, nm);
3909 /* make sure all md_delayed_delete calls have finished */
3910 flush_scheduled_work();
3912 export_array(mddev);
3914 mddev->array_size = 0;
3916 mddev->raid_disks = 0;
3917 mddev->recovery_cp = 0;
3918 mddev->resync_min = 0;
3919 mddev->resync_max = MaxSector;
3920 mddev->reshape_position = MaxSector;
3921 mddev->external = 0;
3922 mddev->persistent = 0;
3923 mddev->level = LEVEL_NONE;
3924 mddev->clevel[0] = 0;
3927 mddev->metadata_type[0] = 0;
3928 mddev->chunk_size = 0;
3929 mddev->ctime = mddev->utime = 0;
3931 mddev->max_disks = 0;
3933 mddev->delta_disks = 0;
3934 mddev->new_level = LEVEL_NONE;
3935 mddev->new_layout = 0;
3936 mddev->new_chunk = 0;
3937 mddev->curr_resync = 0;
3938 mddev->resync_mismatches = 0;
3939 mddev->suspend_lo = mddev->suspend_hi = 0;
3940 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3941 mddev->recovery = 0;
3944 mddev->degraded = 0;
3945 mddev->barriers_work = 0;
3946 mddev->safemode = 0;
3948 } else if (mddev->pers)
3949 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3952 md_new_event(mddev);
3953 sysfs_notify(&mddev->kobj, NULL, "array_state");
3959 static void autorun_array(mddev_t *mddev)
3962 struct list_head *tmp;
3965 if (list_empty(&mddev->disks))
3968 printk(KERN_INFO "md: running: ");
3970 rdev_for_each(rdev, tmp, mddev) {
3971 char b[BDEVNAME_SIZE];
3972 printk("<%s>", bdevname(rdev->bdev,b));
3976 err = do_md_run (mddev);
3978 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3979 do_md_stop (mddev, 0, 0);
3984 * lets try to run arrays based on all disks that have arrived
3985 * until now. (those are in pending_raid_disks)
3987 * the method: pick the first pending disk, collect all disks with
3988 * the same UUID, remove all from the pending list and put them into
3989 * the 'same_array' list. Then order this list based on superblock
3990 * update time (freshest comes first), kick out 'old' disks and
3991 * compare superblocks. If everything's fine then run it.
3993 * If "unit" is allocated, then bump its reference count
3995 static void autorun_devices(int part)
3997 struct list_head *tmp;
3998 mdk_rdev_t *rdev0, *rdev;
4000 char b[BDEVNAME_SIZE];
4002 printk(KERN_INFO "md: autorun ...\n");
4003 while (!list_empty(&pending_raid_disks)) {
4006 LIST_HEAD(candidates);
4007 rdev0 = list_entry(pending_raid_disks.next,
4008 mdk_rdev_t, same_set);
4010 printk(KERN_INFO "md: considering %s ...\n",
4011 bdevname(rdev0->bdev,b));
4012 INIT_LIST_HEAD(&candidates);
4013 rdev_for_each_list(rdev, tmp, pending_raid_disks)
4014 if (super_90_load(rdev, rdev0, 0) >= 0) {
4015 printk(KERN_INFO "md: adding %s ...\n",
4016 bdevname(rdev->bdev,b));
4017 list_move(&rdev->same_set, &candidates);
4020 * now we have a set of devices, with all of them having
4021 * mostly sane superblocks. It's time to allocate the
4025 dev = MKDEV(mdp_major,
4026 rdev0->preferred_minor << MdpMinorShift);
4027 unit = MINOR(dev) >> MdpMinorShift;
4029 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4032 if (rdev0->preferred_minor != unit) {
4033 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4034 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4038 md_probe(dev, NULL, NULL);
4039 mddev = mddev_find(dev);
4040 if (!mddev || !mddev->gendisk) {
4044 "md: cannot allocate memory for md drive.\n");
4047 if (mddev_lock(mddev))
4048 printk(KERN_WARNING "md: %s locked, cannot run\n",
4050 else if (mddev->raid_disks || mddev->major_version
4051 || !list_empty(&mddev->disks)) {
4053 "md: %s already running, cannot run %s\n",
4054 mdname(mddev), bdevname(rdev0->bdev,b));
4055 mddev_unlock(mddev);
4057 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4058 mddev->persistent = 1;
4059 rdev_for_each_list(rdev, tmp, candidates) {
4060 list_del_init(&rdev->same_set);
4061 if (bind_rdev_to_array(rdev, mddev))
4064 autorun_array(mddev);
4065 mddev_unlock(mddev);
4067 /* on success, candidates will be empty, on error
4070 rdev_for_each_list(rdev, tmp, candidates)
4074 printk(KERN_INFO "md: ... autorun DONE.\n");
4076 #endif /* !MODULE */
4078 static int get_version(void __user * arg)
4082 ver.major = MD_MAJOR_VERSION;
4083 ver.minor = MD_MINOR_VERSION;
4084 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4086 if (copy_to_user(arg, &ver, sizeof(ver)))
4092 static int get_array_info(mddev_t * mddev, void __user * arg)
4094 mdu_array_info_t info;
4095 int nr,working,active,failed,spare;
4097 struct list_head *tmp;
4099 nr=working=active=failed=spare=0;
4100 rdev_for_each(rdev, tmp, mddev) {
4102 if (test_bit(Faulty, &rdev->flags))
4106 if (test_bit(In_sync, &rdev->flags))
4113 info.major_version = mddev->major_version;
4114 info.minor_version = mddev->minor_version;
4115 info.patch_version = MD_PATCHLEVEL_VERSION;
4116 info.ctime = mddev->ctime;
4117 info.level = mddev->level;
4118 info.size = mddev->size;
4119 if (info.size != mddev->size) /* overflow */
4122 info.raid_disks = mddev->raid_disks;
4123 info.md_minor = mddev->md_minor;
4124 info.not_persistent= !mddev->persistent;
4126 info.utime = mddev->utime;
4129 info.state = (1<<MD_SB_CLEAN);
4130 if (mddev->bitmap && mddev->bitmap_offset)
4131 info.state = (1<<MD_SB_BITMAP_PRESENT);
4132 info.active_disks = active;
4133 info.working_disks = working;
4134 info.failed_disks = failed;
4135 info.spare_disks = spare;
4137 info.layout = mddev->layout;
4138 info.chunk_size = mddev->chunk_size;
4140 if (copy_to_user(arg, &info, sizeof(info)))
4146 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4148 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4149 char *ptr, *buf = NULL;
4152 if (md_allow_write(mddev))
4153 file = kmalloc(sizeof(*file), GFP_NOIO);
4155 file = kmalloc(sizeof(*file), GFP_KERNEL);
4160 /* bitmap disabled, zero the first byte and copy out */
4161 if (!mddev->bitmap || !mddev->bitmap->file) {
4162 file->pathname[0] = '\0';
4166 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4170 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4174 strcpy(file->pathname, ptr);
4178 if (copy_to_user(arg, file, sizeof(*file)))
4186 static int get_disk_info(mddev_t * mddev, void __user * arg)
4188 mdu_disk_info_t info;
4191 if (copy_from_user(&info, arg, sizeof(info)))
4194 rdev = find_rdev_nr(mddev, info.number);
4196 info.major = MAJOR(rdev->bdev->bd_dev);
4197 info.minor = MINOR(rdev->bdev->bd_dev);
4198 info.raid_disk = rdev->raid_disk;
4200 if (test_bit(Faulty, &rdev->flags))
4201 info.state |= (1<<MD_DISK_FAULTY);
4202 else if (test_bit(In_sync, &rdev->flags)) {
4203 info.state |= (1<<MD_DISK_ACTIVE);
4204 info.state |= (1<<MD_DISK_SYNC);
4206 if (test_bit(WriteMostly, &rdev->flags))
4207 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4209 info.major = info.minor = 0;
4210 info.raid_disk = -1;
4211 info.state = (1<<MD_DISK_REMOVED);
4214 if (copy_to_user(arg, &info, sizeof(info)))
4220 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4222 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4224 dev_t dev = MKDEV(info->major,info->minor);
4226 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4229 if (!mddev->raid_disks) {
4231 /* expecting a device which has a superblock */
4232 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4235 "md: md_import_device returned %ld\n",
4237 return PTR_ERR(rdev);
4239 if (!list_empty(&mddev->disks)) {
4240 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4241 mdk_rdev_t, same_set);
4242 int err = super_types[mddev->major_version]
4243 .load_super(rdev, rdev0, mddev->minor_version);
4246 "md: %s has different UUID to %s\n",
4247 bdevname(rdev->bdev,b),
4248 bdevname(rdev0->bdev,b2));
4253 err = bind_rdev_to_array(rdev, mddev);
4260 * add_new_disk can be used once the array is assembled
4261 * to add "hot spares". They must already have a superblock
4266 if (!mddev->pers->hot_add_disk) {
4268 "%s: personality does not support diskops!\n",
4272 if (mddev->persistent)
4273 rdev = md_import_device(dev, mddev->major_version,
4274 mddev->minor_version);
4276 rdev = md_import_device(dev, -1, -1);
4279 "md: md_import_device returned %ld\n",
4281 return PTR_ERR(rdev);
4283 /* set save_raid_disk if appropriate */
4284 if (!mddev->persistent) {
4285 if (info->state & (1<<MD_DISK_SYNC) &&
4286 info->raid_disk < mddev->raid_disks)
4287 rdev->raid_disk = info->raid_disk;
4289 rdev->raid_disk = -1;
4291 super_types[mddev->major_version].
4292 validate_super(mddev, rdev);
4293 rdev->saved_raid_disk = rdev->raid_disk;
4295 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4296 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4297 set_bit(WriteMostly, &rdev->flags);
4299 rdev->raid_disk = -1;
4300 err = bind_rdev_to_array(rdev, mddev);
4301 if (!err && !mddev->pers->hot_remove_disk) {
4302 /* If there is hot_add_disk but no hot_remove_disk
4303 * then added disks for geometry changes,
4304 * and should be added immediately.
4306 super_types[mddev->major_version].
4307 validate_super(mddev, rdev);
4308 err = mddev->pers->hot_add_disk(mddev, rdev);
4310 unbind_rdev_from_array(rdev);
4315 sysfs_notify(&rdev->kobj, NULL, "state");
4317 md_update_sb(mddev, 1);
4318 if (mddev->degraded)
4319 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4320 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4321 md_wakeup_thread(mddev->thread);
4325 /* otherwise, add_new_disk is only allowed
4326 * for major_version==0 superblocks
4328 if (mddev->major_version != 0) {
4329 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4334 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4336 rdev = md_import_device (dev, -1, 0);
4339 "md: error, md_import_device() returned %ld\n",
4341 return PTR_ERR(rdev);
4343 rdev->desc_nr = info->number;
4344 if (info->raid_disk < mddev->raid_disks)
4345 rdev->raid_disk = info->raid_disk;
4347 rdev->raid_disk = -1;
4349 if (rdev->raid_disk < mddev->raid_disks)
4350 if (info->state & (1<<MD_DISK_SYNC))
4351 set_bit(In_sync, &rdev->flags);
4353 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4354 set_bit(WriteMostly, &rdev->flags);
4356 if (!mddev->persistent) {
4357 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4358 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4360 rdev->sb_offset = calc_dev_sboffset(rdev->bdev) / 2;
4361 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4363 err = bind_rdev_to_array(rdev, mddev);
4373 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4375 char b[BDEVNAME_SIZE];
4378 rdev = find_rdev(mddev, dev);
4382 if (rdev->raid_disk >= 0)
4385 kick_rdev_from_array(rdev);
4386 md_update_sb(mddev, 1);
4387 md_new_event(mddev);
4391 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4392 bdevname(rdev->bdev,b), mdname(mddev));
4396 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4398 char b[BDEVNAME_SIZE];
4405 if (mddev->major_version != 0) {
4406 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4407 " version-0 superblocks.\n",
4411 if (!mddev->pers->hot_add_disk) {
4413 "%s: personality does not support diskops!\n",
4418 rdev = md_import_device (dev, -1, 0);
4421 "md: error, md_import_device() returned %ld\n",
4426 if (mddev->persistent)
4427 rdev->sb_offset = calc_dev_sboffset(rdev->bdev) / 2;
4430 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
4432 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4434 if (test_bit(Faulty, &rdev->flags)) {
4436 "md: can not hot-add faulty %s disk to %s!\n",
4437 bdevname(rdev->bdev,b), mdname(mddev));
4441 clear_bit(In_sync, &rdev->flags);
4443 rdev->saved_raid_disk = -1;
4444 err = bind_rdev_to_array(rdev, mddev);
4449 * The rest should better be atomic, we can have disk failures
4450 * noticed in interrupt contexts ...
4453 if (rdev->desc_nr == mddev->max_disks) {
4454 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4457 goto abort_unbind_export;
4460 rdev->raid_disk = -1;
4462 md_update_sb(mddev, 1);
4465 * Kick recovery, maybe this spare has to be added to the
4466 * array immediately.
4468 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4469 md_wakeup_thread(mddev->thread);
4470 md_new_event(mddev);
4473 abort_unbind_export:
4474 unbind_rdev_from_array(rdev);
4481 static int set_bitmap_file(mddev_t *mddev, int fd)
4486 if (!mddev->pers->quiesce)
4488 if (mddev->recovery || mddev->sync_thread)
4490 /* we should be able to change the bitmap.. */
4496 return -EEXIST; /* cannot add when bitmap is present */
4497 mddev->bitmap_file = fget(fd);
4499 if (mddev->bitmap_file == NULL) {
4500 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4505 err = deny_bitmap_write_access(mddev->bitmap_file);
4507 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4509 fput(mddev->bitmap_file);
4510 mddev->bitmap_file = NULL;
4513 mddev->bitmap_offset = 0; /* file overrides offset */
4514 } else if (mddev->bitmap == NULL)
4515 return -ENOENT; /* cannot remove what isn't there */
4518 mddev->pers->quiesce(mddev, 1);
4520 err = bitmap_create(mddev);
4521 if (fd < 0 || err) {
4522 bitmap_destroy(mddev);
4523 fd = -1; /* make sure to put the file */
4525 mddev->pers->quiesce(mddev, 0);
4528 if (mddev->bitmap_file) {
4529 restore_bitmap_write_access(mddev->bitmap_file);
4530 fput(mddev->bitmap_file);
4532 mddev->bitmap_file = NULL;
4539 * set_array_info is used two different ways
4540 * The original usage is when creating a new array.
4541 * In this usage, raid_disks is > 0 and it together with
4542 * level, size, not_persistent,layout,chunksize determine the
4543 * shape of the array.
4544 * This will always create an array with a type-0.90.0 superblock.
4545 * The newer usage is when assembling an array.
4546 * In this case raid_disks will be 0, and the major_version field is
4547 * use to determine which style super-blocks are to be found on the devices.
4548 * The minor and patch _version numbers are also kept incase the
4549 * super_block handler wishes to interpret them.
4551 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4554 if (info->raid_disks == 0) {
4555 /* just setting version number for superblock loading */
4556 if (info->major_version < 0 ||
4557 info->major_version >= ARRAY_SIZE(super_types) ||
4558 super_types[info->major_version].name == NULL) {
4559 /* maybe try to auto-load a module? */
4561 "md: superblock version %d not known\n",
4562 info->major_version);
4565 mddev->major_version = info->major_version;
4566 mddev->minor_version = info->minor_version;
4567 mddev->patch_version = info->patch_version;
4568 mddev->persistent = !info->not_persistent;
4571 mddev->major_version = MD_MAJOR_VERSION;
4572 mddev->minor_version = MD_MINOR_VERSION;
4573 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4574 mddev->ctime = get_seconds();
4576 mddev->level = info->level;
4577 mddev->clevel[0] = 0;
4578 mddev->size = info->size;
4579 mddev->raid_disks = info->raid_disks;
4580 /* don't set md_minor, it is determined by which /dev/md* was
4583 if (info->state & (1<<MD_SB_CLEAN))
4584 mddev->recovery_cp = MaxSector;
4586 mddev->recovery_cp = 0;
4587 mddev->persistent = ! info->not_persistent;
4588 mddev->external = 0;
4590 mddev->layout = info->layout;
4591 mddev->chunk_size = info->chunk_size;
4593 mddev->max_disks = MD_SB_DISKS;
4595 if (mddev->persistent)
4597 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4599 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4600 mddev->bitmap_offset = 0;
4602 mddev->reshape_position = MaxSector;
4605 * Generate a 128 bit UUID
4607 get_random_bytes(mddev->uuid, 16);
4609 mddev->new_level = mddev->level;
4610 mddev->new_chunk = mddev->chunk_size;
4611 mddev->new_layout = mddev->layout;
4612 mddev->delta_disks = 0;
4617 static int update_size(mddev_t *mddev, sector_t num_sectors)
4621 struct list_head *tmp;
4622 int fit = (num_sectors == 0);
4624 if (mddev->pers->resize == NULL)
4626 /* The "num_sectors" is the number of sectors of each device that
4627 * is used. This can only make sense for arrays with redundancy.
4628 * linear and raid0 always use whatever space is available. We can only
4629 * consider changing this number if no resync or reconstruction is
4630 * happening, and if the new size is acceptable. It must fit before the
4631 * sb_offset or, if that is <data_offset, it must fit before the size
4632 * of each device. If num_sectors is zero, we find the largest size
4636 if (mddev->sync_thread)
4638 rdev_for_each(rdev, tmp, mddev) {
4640 avail = rdev->size * 2;
4642 if (fit && (num_sectors == 0 || num_sectors > avail))
4643 num_sectors = avail;
4644 if (avail < num_sectors)
4647 rv = mddev->pers->resize(mddev, num_sectors);
4649 struct block_device *bdev;
4651 bdev = bdget_disk(mddev->gendisk, 0);
4653 mutex_lock(&bdev->bd_inode->i_mutex);
4654 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
4655 mutex_unlock(&bdev->bd_inode->i_mutex);
4662 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4665 /* change the number of raid disks */
4666 if (mddev->pers->check_reshape == NULL)
4668 if (raid_disks <= 0 ||
4669 raid_disks >= mddev->max_disks)
4671 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4673 mddev->delta_disks = raid_disks - mddev->raid_disks;
4675 rv = mddev->pers->check_reshape(mddev);
4681 * update_array_info is used to change the configuration of an
4683 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4684 * fields in the info are checked against the array.
4685 * Any differences that cannot be handled will cause an error.
4686 * Normally, only one change can be managed at a time.
4688 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4694 /* calculate expected state,ignoring low bits */
4695 if (mddev->bitmap && mddev->bitmap_offset)
4696 state |= (1 << MD_SB_BITMAP_PRESENT);
4698 if (mddev->major_version != info->major_version ||
4699 mddev->minor_version != info->minor_version ||
4700 /* mddev->patch_version != info->patch_version || */
4701 mddev->ctime != info->ctime ||
4702 mddev->level != info->level ||
4703 /* mddev->layout != info->layout || */
4704 !mddev->persistent != info->not_persistent||
4705 mddev->chunk_size != info->chunk_size ||
4706 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4707 ((state^info->state) & 0xfffffe00)
4710 /* Check there is only one change */
4711 if (info->size >= 0 && mddev->size != info->size) cnt++;
4712 if (mddev->raid_disks != info->raid_disks) cnt++;
4713 if (mddev->layout != info->layout) cnt++;
4714 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4715 if (cnt == 0) return 0;
4716 if (cnt > 1) return -EINVAL;
4718 if (mddev->layout != info->layout) {
4720 * we don't need to do anything at the md level, the
4721 * personality will take care of it all.
4723 if (mddev->pers->reconfig == NULL)
4726 return mddev->pers->reconfig(mddev, info->layout, -1);
4728 if (info->size >= 0 && mddev->size != info->size)
4729 rv = update_size(mddev, (sector_t)info->size * 2);
4731 if (mddev->raid_disks != info->raid_disks)
4732 rv = update_raid_disks(mddev, info->raid_disks);
4734 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4735 if (mddev->pers->quiesce == NULL)
4737 if (mddev->recovery || mddev->sync_thread)
4739 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4740 /* add the bitmap */
4743 if (mddev->default_bitmap_offset == 0)
4745 mddev->bitmap_offset = mddev->default_bitmap_offset;
4746 mddev->pers->quiesce(mddev, 1);
4747 rv = bitmap_create(mddev);
4749 bitmap_destroy(mddev);
4750 mddev->pers->quiesce(mddev, 0);
4752 /* remove the bitmap */
4755 if (mddev->bitmap->file)
4757 mddev->pers->quiesce(mddev, 1);
4758 bitmap_destroy(mddev);
4759 mddev->pers->quiesce(mddev, 0);
4760 mddev->bitmap_offset = 0;
4763 md_update_sb(mddev, 1);
4767 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4771 if (mddev->pers == NULL)
4774 rdev = find_rdev(mddev, dev);
4778 md_error(mddev, rdev);
4783 * We have a problem here : there is no easy way to give a CHS
4784 * virtual geometry. We currently pretend that we have a 2 heads
4785 * 4 sectors (with a BIG number of cylinders...). This drives
4786 * dosfs just mad... ;-)
4788 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4790 mddev_t *mddev = bdev->bd_disk->private_data;
4794 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4798 static int md_ioctl(struct inode *inode, struct file *file,
4799 unsigned int cmd, unsigned long arg)
4802 void __user *argp = (void __user *)arg;
4803 mddev_t *mddev = NULL;
4805 if (!capable(CAP_SYS_ADMIN))
4809 * Commands dealing with the RAID driver but not any
4815 err = get_version(argp);
4818 case PRINT_RAID_DEBUG:
4826 autostart_arrays(arg);
4833 * Commands creating/starting a new array:
4836 mddev = inode->i_bdev->bd_disk->private_data;
4843 err = mddev_lock(mddev);
4846 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4853 case SET_ARRAY_INFO:
4855 mdu_array_info_t info;
4857 memset(&info, 0, sizeof(info));
4858 else if (copy_from_user(&info, argp, sizeof(info))) {
4863 err = update_array_info(mddev, &info);
4865 printk(KERN_WARNING "md: couldn't update"
4866 " array info. %d\n", err);
4871 if (!list_empty(&mddev->disks)) {
4873 "md: array %s already has disks!\n",
4878 if (mddev->raid_disks) {
4880 "md: array %s already initialised!\n",
4885 err = set_array_info(mddev, &info);
4887 printk(KERN_WARNING "md: couldn't set"
4888 " array info. %d\n", err);
4898 * Commands querying/configuring an existing array:
4900 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4901 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4902 if ((!mddev->raid_disks && !mddev->external)
4903 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4904 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4905 && cmd != GET_BITMAP_FILE) {
4911 * Commands even a read-only array can execute:
4915 case GET_ARRAY_INFO:
4916 err = get_array_info(mddev, argp);
4919 case GET_BITMAP_FILE:
4920 err = get_bitmap_file(mddev, argp);
4924 err = get_disk_info(mddev, argp);
4927 case RESTART_ARRAY_RW:
4928 err = restart_array(mddev);
4932 err = do_md_stop (mddev, 0, 1);
4936 err = do_md_stop (mddev, 1, 1);
4942 * The remaining ioctls are changing the state of the
4943 * superblock, so we do not allow them on read-only arrays.
4944 * However non-MD ioctls (e.g. get-size) will still come through
4945 * here and hit the 'default' below, so only disallow
4946 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4948 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
4949 if (mddev->ro == 2) {
4951 sysfs_notify(&mddev->kobj, NULL, "array_state");
4952 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4953 md_wakeup_thread(mddev->thread);
4964 mdu_disk_info_t info;
4965 if (copy_from_user(&info, argp, sizeof(info)))
4968 err = add_new_disk(mddev, &info);
4972 case HOT_REMOVE_DISK:
4973 err = hot_remove_disk(mddev, new_decode_dev(arg));
4977 err = hot_add_disk(mddev, new_decode_dev(arg));
4980 case SET_DISK_FAULTY:
4981 err = set_disk_faulty(mddev, new_decode_dev(arg));
4985 err = do_md_run (mddev);
4988 case SET_BITMAP_FILE:
4989 err = set_bitmap_file(mddev, (int)arg);
4999 mddev_unlock(mddev);
5009 static int md_open(struct inode *inode, struct file *file)
5012 * Succeed if we can lock the mddev, which confirms that
5013 * it isn't being stopped right now.
5015 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
5018 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5023 mddev_unlock(mddev);
5025 check_disk_change(inode->i_bdev);
5030 static int md_release(struct inode *inode, struct file * file)
5032 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
5040 static int md_media_changed(struct gendisk *disk)
5042 mddev_t *mddev = disk->private_data;
5044 return mddev->changed;
5047 static int md_revalidate(struct gendisk *disk)
5049 mddev_t *mddev = disk->private_data;
5054 static struct block_device_operations md_fops =
5056 .owner = THIS_MODULE,
5058 .release = md_release,
5060 .getgeo = md_getgeo,
5061 .media_changed = md_media_changed,
5062 .revalidate_disk= md_revalidate,
5065 static int md_thread(void * arg)
5067 mdk_thread_t *thread = arg;
5070 * md_thread is a 'system-thread', it's priority should be very
5071 * high. We avoid resource deadlocks individually in each
5072 * raid personality. (RAID5 does preallocation) We also use RR and
5073 * the very same RT priority as kswapd, thus we will never get
5074 * into a priority inversion deadlock.
5076 * we definitely have to have equal or higher priority than
5077 * bdflush, otherwise bdflush will deadlock if there are too
5078 * many dirty RAID5 blocks.
5081 allow_signal(SIGKILL);
5082 while (!kthread_should_stop()) {
5084 /* We need to wait INTERRUPTIBLE so that
5085 * we don't add to the load-average.
5086 * That means we need to be sure no signals are
5089 if (signal_pending(current))
5090 flush_signals(current);
5092 wait_event_interruptible_timeout
5094 test_bit(THREAD_WAKEUP, &thread->flags)
5095 || kthread_should_stop(),
5098 clear_bit(THREAD_WAKEUP, &thread->flags);
5100 thread->run(thread->mddev);
5106 void md_wakeup_thread(mdk_thread_t *thread)
5109 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5110 set_bit(THREAD_WAKEUP, &thread->flags);
5111 wake_up(&thread->wqueue);
5115 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5118 mdk_thread_t *thread;
5120 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5124 init_waitqueue_head(&thread->wqueue);
5127 thread->mddev = mddev;
5128 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5129 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5130 if (IS_ERR(thread->tsk)) {
5137 void md_unregister_thread(mdk_thread_t *thread)
5139 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5141 kthread_stop(thread->tsk);
5145 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5152 if (!rdev || test_bit(Faulty, &rdev->flags))
5155 if (mddev->external)
5156 set_bit(Blocked, &rdev->flags);
5158 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5160 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5161 __builtin_return_address(0),__builtin_return_address(1),
5162 __builtin_return_address(2),__builtin_return_address(3));
5166 if (!mddev->pers->error_handler)
5168 mddev->pers->error_handler(mddev,rdev);
5169 if (mddev->degraded)
5170 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5171 set_bit(StateChanged, &rdev->flags);
5172 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5173 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5174 md_wakeup_thread(mddev->thread);
5175 md_new_event_inintr(mddev);
5178 /* seq_file implementation /proc/mdstat */
5180 static void status_unused(struct seq_file *seq)
5184 struct list_head *tmp;
5186 seq_printf(seq, "unused devices: ");
5188 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
5189 char b[BDEVNAME_SIZE];
5191 seq_printf(seq, "%s ",
5192 bdevname(rdev->bdev,b));
5195 seq_printf(seq, "<none>");
5197 seq_printf(seq, "\n");
5201 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5203 sector_t max_blocks, resync, res;
5204 unsigned long dt, db, rt;
5206 unsigned int per_milli;
5208 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5210 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5211 max_blocks = mddev->resync_max_sectors >> 1;
5213 max_blocks = mddev->size;
5216 * Should not happen.
5222 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5223 * in a sector_t, and (max_blocks>>scale) will fit in a
5224 * u32, as those are the requirements for sector_div.
5225 * Thus 'scale' must be at least 10
5228 if (sizeof(sector_t) > sizeof(unsigned long)) {
5229 while ( max_blocks/2 > (1ULL<<(scale+32)))
5232 res = (resync>>scale)*1000;
5233 sector_div(res, (u32)((max_blocks>>scale)+1));
5237 int i, x = per_milli/50, y = 20-x;
5238 seq_printf(seq, "[");
5239 for (i = 0; i < x; i++)
5240 seq_printf(seq, "=");
5241 seq_printf(seq, ">");
5242 for (i = 0; i < y; i++)
5243 seq_printf(seq, ".");
5244 seq_printf(seq, "] ");
5246 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5247 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5249 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5251 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5252 "resync" : "recovery"))),
5253 per_milli/10, per_milli % 10,
5254 (unsigned long long) resync,
5255 (unsigned long long) max_blocks);
5258 * We do not want to overflow, so the order of operands and
5259 * the * 100 / 100 trick are important. We do a +1 to be
5260 * safe against division by zero. We only estimate anyway.
5262 * dt: time from mark until now
5263 * db: blocks written from mark until now
5264 * rt: remaining time
5266 dt = ((jiffies - mddev->resync_mark) / HZ);
5268 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5269 - mddev->resync_mark_cnt;
5270 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5272 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5274 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5277 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5279 struct list_head *tmp;
5289 spin_lock(&all_mddevs_lock);
5290 list_for_each(tmp,&all_mddevs)
5292 mddev = list_entry(tmp, mddev_t, all_mddevs);
5294 spin_unlock(&all_mddevs_lock);
5297 spin_unlock(&all_mddevs_lock);
5299 return (void*)2;/* tail */
5303 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5305 struct list_head *tmp;
5306 mddev_t *next_mddev, *mddev = v;
5312 spin_lock(&all_mddevs_lock);
5314 tmp = all_mddevs.next;
5316 tmp = mddev->all_mddevs.next;
5317 if (tmp != &all_mddevs)
5318 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5320 next_mddev = (void*)2;
5323 spin_unlock(&all_mddevs_lock);
5331 static void md_seq_stop(struct seq_file *seq, void *v)
5335 if (mddev && v != (void*)1 && v != (void*)2)
5339 struct mdstat_info {
5343 static int md_seq_show(struct seq_file *seq, void *v)
5347 struct list_head *tmp2;
5349 struct mdstat_info *mi = seq->private;
5350 struct bitmap *bitmap;
5352 if (v == (void*)1) {
5353 struct mdk_personality *pers;
5354 seq_printf(seq, "Personalities : ");
5355 spin_lock(&pers_lock);
5356 list_for_each_entry(pers, &pers_list, list)
5357 seq_printf(seq, "[%s] ", pers->name);
5359 spin_unlock(&pers_lock);
5360 seq_printf(seq, "\n");
5361 mi->event = atomic_read(&md_event_count);
5364 if (v == (void*)2) {
5369 if (mddev_lock(mddev) < 0)
5372 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5373 seq_printf(seq, "%s : %sactive", mdname(mddev),
5374 mddev->pers ? "" : "in");
5377 seq_printf(seq, " (read-only)");
5379 seq_printf(seq, " (auto-read-only)");
5380 seq_printf(seq, " %s", mddev->pers->name);
5384 rdev_for_each(rdev, tmp2, mddev) {
5385 char b[BDEVNAME_SIZE];
5386 seq_printf(seq, " %s[%d]",
5387 bdevname(rdev->bdev,b), rdev->desc_nr);
5388 if (test_bit(WriteMostly, &rdev->flags))
5389 seq_printf(seq, "(W)");
5390 if (test_bit(Faulty, &rdev->flags)) {
5391 seq_printf(seq, "(F)");
5393 } else if (rdev->raid_disk < 0)
5394 seq_printf(seq, "(S)"); /* spare */
5398 if (!list_empty(&mddev->disks)) {
5400 seq_printf(seq, "\n %llu blocks",
5401 (unsigned long long)mddev->array_size);
5403 seq_printf(seq, "\n %llu blocks",
5404 (unsigned long long)size);
5406 if (mddev->persistent) {
5407 if (mddev->major_version != 0 ||
5408 mddev->minor_version != 90) {
5409 seq_printf(seq," super %d.%d",
5410 mddev->major_version,
5411 mddev->minor_version);
5413 } else if (mddev->external)
5414 seq_printf(seq, " super external:%s",
5415 mddev->metadata_type);
5417 seq_printf(seq, " super non-persistent");
5420 mddev->pers->status (seq, mddev);
5421 seq_printf(seq, "\n ");
5422 if (mddev->pers->sync_request) {
5423 if (mddev->curr_resync > 2) {
5424 status_resync (seq, mddev);
5425 seq_printf(seq, "\n ");
5426 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5427 seq_printf(seq, "\tresync=DELAYED\n ");
5428 else if (mddev->recovery_cp < MaxSector)
5429 seq_printf(seq, "\tresync=PENDING\n ");
5432 seq_printf(seq, "\n ");
5434 if ((bitmap = mddev->bitmap)) {
5435 unsigned long chunk_kb;
5436 unsigned long flags;
5437 spin_lock_irqsave(&bitmap->lock, flags);
5438 chunk_kb = bitmap->chunksize >> 10;
5439 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5441 bitmap->pages - bitmap->missing_pages,
5443 (bitmap->pages - bitmap->missing_pages)
5444 << (PAGE_SHIFT - 10),
5445 chunk_kb ? chunk_kb : bitmap->chunksize,
5446 chunk_kb ? "KB" : "B");
5448 seq_printf(seq, ", file: ");
5449 seq_path(seq, &bitmap->file->f_path, " \t\n");
5452 seq_printf(seq, "\n");
5453 spin_unlock_irqrestore(&bitmap->lock, flags);
5456 seq_printf(seq, "\n");
5458 mddev_unlock(mddev);
5463 static struct seq_operations md_seq_ops = {
5464 .start = md_seq_start,
5465 .next = md_seq_next,
5466 .stop = md_seq_stop,
5467 .show = md_seq_show,
5470 static int md_seq_open(struct inode *inode, struct file *file)
5473 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5477 error = seq_open(file, &md_seq_ops);
5481 struct seq_file *p = file->private_data;
5483 mi->event = atomic_read(&md_event_count);
5488 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5490 struct seq_file *m = filp->private_data;
5491 struct mdstat_info *mi = m->private;
5494 poll_wait(filp, &md_event_waiters, wait);
5496 /* always allow read */
5497 mask = POLLIN | POLLRDNORM;
5499 if (mi->event != atomic_read(&md_event_count))
5500 mask |= POLLERR | POLLPRI;
5504 static const struct file_operations md_seq_fops = {
5505 .owner = THIS_MODULE,
5506 .open = md_seq_open,
5508 .llseek = seq_lseek,
5509 .release = seq_release_private,
5510 .poll = mdstat_poll,
5513 int register_md_personality(struct mdk_personality *p)
5515 spin_lock(&pers_lock);
5516 list_add_tail(&p->list, &pers_list);
5517 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5518 spin_unlock(&pers_lock);
5522 int unregister_md_personality(struct mdk_personality *p)
5524 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5525 spin_lock(&pers_lock);
5526 list_del_init(&p->list);
5527 spin_unlock(&pers_lock);
5531 static int is_mddev_idle(mddev_t *mddev)
5534 struct list_head *tmp;
5539 rdev_for_each(rdev, tmp, mddev) {
5540 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5541 curr_events = disk_stat_read(disk, sectors[0]) +
5542 disk_stat_read(disk, sectors[1]) -
5543 atomic_read(&disk->sync_io);
5544 /* sync IO will cause sync_io to increase before the disk_stats
5545 * as sync_io is counted when a request starts, and
5546 * disk_stats is counted when it completes.
5547 * So resync activity will cause curr_events to be smaller than
5548 * when there was no such activity.
5549 * non-sync IO will cause disk_stat to increase without
5550 * increasing sync_io so curr_events will (eventually)
5551 * be larger than it was before. Once it becomes
5552 * substantially larger, the test below will cause
5553 * the array to appear non-idle, and resync will slow
5555 * If there is a lot of outstanding resync activity when
5556 * we set last_event to curr_events, then all that activity
5557 * completing might cause the array to appear non-idle
5558 * and resync will be slowed down even though there might
5559 * not have been non-resync activity. This will only
5560 * happen once though. 'last_events' will soon reflect
5561 * the state where there is little or no outstanding
5562 * resync requests, and further resync activity will
5563 * always make curr_events less than last_events.
5566 if (curr_events - rdev->last_events > 4096) {
5567 rdev->last_events = curr_events;
5574 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5576 /* another "blocks" (512byte) blocks have been synced */
5577 atomic_sub(blocks, &mddev->recovery_active);
5578 wake_up(&mddev->recovery_wait);
5580 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5581 md_wakeup_thread(mddev->thread);
5582 // stop recovery, signal do_sync ....
5587 /* md_write_start(mddev, bi)
5588 * If we need to update some array metadata (e.g. 'active' flag
5589 * in superblock) before writing, schedule a superblock update
5590 * and wait for it to complete.
5592 void md_write_start(mddev_t *mddev, struct bio *bi)
5595 if (bio_data_dir(bi) != WRITE)
5598 BUG_ON(mddev->ro == 1);
5599 if (mddev->ro == 2) {
5600 /* need to switch to read/write */
5602 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5603 md_wakeup_thread(mddev->thread);
5604 md_wakeup_thread(mddev->sync_thread);
5607 atomic_inc(&mddev->writes_pending);
5608 if (mddev->safemode == 1)
5609 mddev->safemode = 0;
5610 if (mddev->in_sync) {
5611 spin_lock_irq(&mddev->write_lock);
5612 if (mddev->in_sync) {
5614 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5615 md_wakeup_thread(mddev->thread);
5618 spin_unlock_irq(&mddev->write_lock);
5621 sysfs_notify(&mddev->kobj, NULL, "array_state");
5622 wait_event(mddev->sb_wait,
5623 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5624 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5627 void md_write_end(mddev_t *mddev)
5629 if (atomic_dec_and_test(&mddev->writes_pending)) {
5630 if (mddev->safemode == 2)
5631 md_wakeup_thread(mddev->thread);
5632 else if (mddev->safemode_delay)
5633 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5637 /* md_allow_write(mddev)
5638 * Calling this ensures that the array is marked 'active' so that writes
5639 * may proceed without blocking. It is important to call this before
5640 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5641 * Must be called with mddev_lock held.
5643 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5644 * is dropped, so return -EAGAIN after notifying userspace.
5646 int md_allow_write(mddev_t *mddev)
5652 if (!mddev->pers->sync_request)
5655 spin_lock_irq(&mddev->write_lock);
5656 if (mddev->in_sync) {
5658 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5659 if (mddev->safemode_delay &&
5660 mddev->safemode == 0)
5661 mddev->safemode = 1;
5662 spin_unlock_irq(&mddev->write_lock);
5663 md_update_sb(mddev, 0);
5664 sysfs_notify(&mddev->kobj, NULL, "array_state");
5666 spin_unlock_irq(&mddev->write_lock);
5668 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
5673 EXPORT_SYMBOL_GPL(md_allow_write);
5675 #define SYNC_MARKS 10
5676 #define SYNC_MARK_STEP (3*HZ)
5677 void md_do_sync(mddev_t *mddev)
5680 unsigned int currspeed = 0,
5682 sector_t max_sectors,j, io_sectors;
5683 unsigned long mark[SYNC_MARKS];
5684 sector_t mark_cnt[SYNC_MARKS];
5686 struct list_head *tmp;
5687 sector_t last_check;
5689 struct list_head *rtmp;
5693 /* just incase thread restarts... */
5694 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5696 if (mddev->ro) /* never try to sync a read-only array */
5699 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5700 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5701 desc = "data-check";
5702 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5703 desc = "requested-resync";
5706 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5711 /* we overload curr_resync somewhat here.
5712 * 0 == not engaged in resync at all
5713 * 2 == checking that there is no conflict with another sync
5714 * 1 == like 2, but have yielded to allow conflicting resync to
5716 * other == active in resync - this many blocks
5718 * Before starting a resync we must have set curr_resync to
5719 * 2, and then checked that every "conflicting" array has curr_resync
5720 * less than ours. When we find one that is the same or higher
5721 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5722 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5723 * This will mean we have to start checking from the beginning again.
5728 mddev->curr_resync = 2;
5731 if (kthread_should_stop()) {
5732 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5735 for_each_mddev(mddev2, tmp) {
5736 if (mddev2 == mddev)
5738 if (!mddev->parallel_resync
5739 && mddev2->curr_resync
5740 && match_mddev_units(mddev, mddev2)) {
5742 if (mddev < mddev2 && mddev->curr_resync == 2) {
5743 /* arbitrarily yield */
5744 mddev->curr_resync = 1;
5745 wake_up(&resync_wait);
5747 if (mddev > mddev2 && mddev->curr_resync == 1)
5748 /* no need to wait here, we can wait the next
5749 * time 'round when curr_resync == 2
5752 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
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));
5761 finish_wait(&resync_wait, &wq);
5764 finish_wait(&resync_wait, &wq);
5767 } while (mddev->curr_resync < 2);
5770 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5771 /* resync follows the size requested by the personality,
5772 * which defaults to physical size, but can be virtual size
5774 max_sectors = mddev->resync_max_sectors;
5775 mddev->resync_mismatches = 0;
5776 /* we don't use the checkpoint if there's a bitmap */
5777 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5778 j = mddev->resync_min;
5779 else if (!mddev->bitmap)
5780 j = mddev->recovery_cp;
5782 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5783 max_sectors = mddev->size << 1;
5785 /* recovery follows the physical size of devices */
5786 max_sectors = mddev->size << 1;
5788 rdev_for_each(rdev, rtmp, mddev)
5789 if (rdev->raid_disk >= 0 &&
5790 !test_bit(Faulty, &rdev->flags) &&
5791 !test_bit(In_sync, &rdev->flags) &&
5792 rdev->recovery_offset < j)
5793 j = rdev->recovery_offset;
5796 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5797 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5798 " %d KB/sec/disk.\n", speed_min(mddev));
5799 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5800 "(but not more than %d KB/sec) for %s.\n",
5801 speed_max(mddev), desc);
5803 is_mddev_idle(mddev); /* this also initializes IO event counters */
5806 for (m = 0; m < SYNC_MARKS; m++) {
5808 mark_cnt[m] = io_sectors;
5811 mddev->resync_mark = mark[last_mark];
5812 mddev->resync_mark_cnt = mark_cnt[last_mark];
5815 * Tune reconstruction:
5817 window = 32*(PAGE_SIZE/512);
5818 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5819 window/2,(unsigned long long) max_sectors/2);
5821 atomic_set(&mddev->recovery_active, 0);
5826 "md: resuming %s of %s from checkpoint.\n",
5827 desc, mdname(mddev));
5828 mddev->curr_resync = j;
5831 while (j < max_sectors) {
5835 if (j >= mddev->resync_max) {
5836 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5837 wait_event(mddev->recovery_wait,
5838 mddev->resync_max > j
5839 || kthread_should_stop());
5841 if (kthread_should_stop())
5843 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5844 currspeed < speed_min(mddev));
5846 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5850 if (!skipped) { /* actual IO requested */
5851 io_sectors += sectors;
5852 atomic_add(sectors, &mddev->recovery_active);
5856 if (j>1) mddev->curr_resync = j;
5857 mddev->curr_mark_cnt = io_sectors;
5858 if (last_check == 0)
5859 /* this is the earliers that rebuilt will be
5860 * visible in /proc/mdstat
5862 md_new_event(mddev);
5864 if (last_check + window > io_sectors || j == max_sectors)
5867 last_check = io_sectors;
5869 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5873 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5875 int next = (last_mark+1) % SYNC_MARKS;
5877 mddev->resync_mark = mark[next];
5878 mddev->resync_mark_cnt = mark_cnt[next];
5879 mark[next] = jiffies;
5880 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5885 if (kthread_should_stop())
5890 * this loop exits only if either when we are slower than
5891 * the 'hard' speed limit, or the system was IO-idle for
5893 * the system might be non-idle CPU-wise, but we only care
5894 * about not overloading the IO subsystem. (things like an
5895 * e2fsck being done on the RAID array should execute fast)
5897 blk_unplug(mddev->queue);
5900 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5901 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5903 if (currspeed > speed_min(mddev)) {
5904 if ((currspeed > speed_max(mddev)) ||
5905 !is_mddev_idle(mddev)) {
5911 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5913 * this also signals 'finished resyncing' to md_stop
5916 blk_unplug(mddev->queue);
5918 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5920 /* tell personality that we are finished */
5921 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5923 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5924 mddev->curr_resync > 2) {
5925 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5926 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5927 if (mddev->curr_resync >= mddev->recovery_cp) {
5929 "md: checkpointing %s of %s.\n",
5930 desc, mdname(mddev));
5931 mddev->recovery_cp = mddev->curr_resync;
5934 mddev->recovery_cp = MaxSector;
5936 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5937 mddev->curr_resync = MaxSector;
5938 rdev_for_each(rdev, rtmp, mddev)
5939 if (rdev->raid_disk >= 0 &&
5940 !test_bit(Faulty, &rdev->flags) &&
5941 !test_bit(In_sync, &rdev->flags) &&
5942 rdev->recovery_offset < mddev->curr_resync)
5943 rdev->recovery_offset = mddev->curr_resync;
5946 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5949 mddev->curr_resync = 0;
5950 mddev->resync_min = 0;
5951 mddev->resync_max = MaxSector;
5952 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5953 wake_up(&resync_wait);
5954 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5955 md_wakeup_thread(mddev->thread);
5960 * got a signal, exit.
5963 "md: md_do_sync() got signal ... exiting\n");
5964 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5968 EXPORT_SYMBOL_GPL(md_do_sync);
5971 static int remove_and_add_spares(mddev_t *mddev)
5974 struct list_head *rtmp;
5977 rdev_for_each(rdev, rtmp, mddev)
5978 if (rdev->raid_disk >= 0 &&
5979 !test_bit(Blocked, &rdev->flags) &&
5980 (test_bit(Faulty, &rdev->flags) ||
5981 ! test_bit(In_sync, &rdev->flags)) &&
5982 atomic_read(&rdev->nr_pending)==0) {
5983 if (mddev->pers->hot_remove_disk(
5984 mddev, rdev->raid_disk)==0) {
5986 sprintf(nm,"rd%d", rdev->raid_disk);
5987 sysfs_remove_link(&mddev->kobj, nm);
5988 rdev->raid_disk = -1;
5992 if (mddev->degraded) {
5993 rdev_for_each(rdev, rtmp, mddev) {
5994 if (rdev->raid_disk >= 0 &&
5995 !test_bit(In_sync, &rdev->flags))
5997 if (rdev->raid_disk < 0
5998 && !test_bit(Faulty, &rdev->flags)) {
5999 rdev->recovery_offset = 0;
6001 hot_add_disk(mddev, rdev) == 0) {
6003 sprintf(nm, "rd%d", rdev->raid_disk);
6004 if (sysfs_create_link(&mddev->kobj,
6007 "md: cannot register "
6011 md_new_event(mddev);
6020 * This routine is regularly called by all per-raid-array threads to
6021 * deal with generic issues like resync and super-block update.
6022 * Raid personalities that don't have a thread (linear/raid0) do not
6023 * need this as they never do any recovery or update the superblock.
6025 * It does not do any resync itself, but rather "forks" off other threads
6026 * to do that as needed.
6027 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6028 * "->recovery" and create a thread at ->sync_thread.
6029 * When the thread finishes it sets MD_RECOVERY_DONE
6030 * and wakeups up this thread which will reap the thread and finish up.
6031 * This thread also removes any faulty devices (with nr_pending == 0).
6033 * The overall approach is:
6034 * 1/ if the superblock needs updating, update it.
6035 * 2/ If a recovery thread is running, don't do anything else.
6036 * 3/ If recovery has finished, clean up, possibly marking spares active.
6037 * 4/ If there are any faulty devices, remove them.
6038 * 5/ If array is degraded, try to add spares devices
6039 * 6/ If array has spares or is not in-sync, start a resync thread.
6041 void md_check_recovery(mddev_t *mddev)
6044 struct list_head *rtmp;
6048 bitmap_daemon_work(mddev->bitmap);
6053 if (signal_pending(current)) {
6054 if (mddev->pers->sync_request && !mddev->external) {
6055 printk(KERN_INFO "md: %s in immediate safe mode\n",
6057 mddev->safemode = 2;
6059 flush_signals(current);
6063 (mddev->flags && !mddev->external) ||
6064 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6065 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6066 (mddev->external == 0 && mddev->safemode == 1) ||
6067 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6068 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6072 if (mddev_trylock(mddev)) {
6075 if (!mddev->external) {
6077 spin_lock_irq(&mddev->write_lock);
6078 if (mddev->safemode &&
6079 !atomic_read(&mddev->writes_pending) &&
6081 mddev->recovery_cp == MaxSector) {
6084 if (mddev->persistent)
6085 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6087 if (mddev->safemode == 1)
6088 mddev->safemode = 0;
6089 spin_unlock_irq(&mddev->write_lock);
6091 sysfs_notify(&mddev->kobj, NULL, "array_state");
6095 md_update_sb(mddev, 0);
6097 rdev_for_each(rdev, rtmp, mddev)
6098 if (test_and_clear_bit(StateChanged, &rdev->flags))
6099 sysfs_notify(&rdev->kobj, NULL, "state");
6102 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6103 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6104 /* resync/recovery still happening */
6105 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6108 if (mddev->sync_thread) {
6109 /* resync has finished, collect result */
6110 md_unregister_thread(mddev->sync_thread);
6111 mddev->sync_thread = NULL;
6112 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
6114 /* activate any spares */
6115 if (mddev->pers->spare_active(mddev))
6116 sysfs_notify(&mddev->kobj, NULL,
6119 md_update_sb(mddev, 1);
6121 /* if array is no-longer degraded, then any saved_raid_disk
6122 * information must be scrapped
6124 if (!mddev->degraded)
6125 rdev_for_each(rdev, rtmp, mddev)
6126 rdev->saved_raid_disk = -1;
6128 mddev->recovery = 0;
6129 /* flag recovery needed just to double check */
6130 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6131 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6132 md_new_event(mddev);
6135 /* Set RUNNING before clearing NEEDED to avoid
6136 * any transients in the value of "sync_action".
6138 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6139 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6140 /* Clear some bits that don't mean anything, but
6143 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6144 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6146 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6148 /* no recovery is running.
6149 * remove any failed drives, then
6150 * add spares if possible.
6151 * Spare are also removed and re-added, to allow
6152 * the personality to fail the re-add.
6155 if (mddev->reshape_position != MaxSector) {
6156 if (mddev->pers->check_reshape(mddev) != 0)
6157 /* Cannot proceed */
6159 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6160 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6161 } else if ((spares = remove_and_add_spares(mddev))) {
6162 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6163 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6164 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6165 } else if (mddev->recovery_cp < MaxSector) {
6166 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6167 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6168 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6169 /* nothing to be done ... */
6172 if (mddev->pers->sync_request) {
6173 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6174 /* We are adding a device or devices to an array
6175 * which has the bitmap stored on all devices.
6176 * So make sure all bitmap pages get written
6178 bitmap_write_all(mddev->bitmap);
6180 mddev->sync_thread = md_register_thread(md_do_sync,
6183 if (!mddev->sync_thread) {
6184 printk(KERN_ERR "%s: could not start resync"
6187 /* leave the spares where they are, it shouldn't hurt */
6188 mddev->recovery = 0;
6190 md_wakeup_thread(mddev->sync_thread);
6191 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6192 md_new_event(mddev);
6195 if (!mddev->sync_thread) {
6196 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6197 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6199 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6201 mddev_unlock(mddev);
6205 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6207 sysfs_notify(&rdev->kobj, NULL, "state");
6208 wait_event_timeout(rdev->blocked_wait,
6209 !test_bit(Blocked, &rdev->flags),
6210 msecs_to_jiffies(5000));
6211 rdev_dec_pending(rdev, mddev);
6213 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6215 static int md_notify_reboot(struct notifier_block *this,
6216 unsigned long code, void *x)
6218 struct list_head *tmp;
6221 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6223 printk(KERN_INFO "md: stopping all md devices.\n");
6225 for_each_mddev(mddev, tmp)
6226 if (mddev_trylock(mddev)) {
6227 do_md_stop (mddev, 1, 0);
6228 mddev_unlock(mddev);
6231 * certain more exotic SCSI devices are known to be
6232 * volatile wrt too early system reboots. While the
6233 * right place to handle this issue is the given
6234 * driver, we do want to have a safe RAID driver ...
6241 static struct notifier_block md_notifier = {
6242 .notifier_call = md_notify_reboot,
6244 .priority = INT_MAX, /* before any real devices */
6247 static void md_geninit(void)
6249 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6251 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6254 static int __init md_init(void)
6256 if (register_blkdev(MAJOR_NR, "md"))
6258 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6259 unregister_blkdev(MAJOR_NR, "md");
6262 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6263 md_probe, NULL, NULL);
6264 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6265 md_probe, NULL, NULL);
6267 register_reboot_notifier(&md_notifier);
6268 raid_table_header = register_sysctl_table(raid_root_table);
6278 * Searches all registered partitions for autorun RAID arrays
6282 static LIST_HEAD(all_detected_devices);
6283 struct detected_devices_node {
6284 struct list_head list;
6288 void md_autodetect_dev(dev_t dev)
6290 struct detected_devices_node *node_detected_dev;
6292 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6293 if (node_detected_dev) {
6294 node_detected_dev->dev = dev;
6295 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6297 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6298 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6303 static void autostart_arrays(int part)
6306 struct detected_devices_node *node_detected_dev;
6308 int i_scanned, i_passed;
6313 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6315 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6317 node_detected_dev = list_entry(all_detected_devices.next,
6318 struct detected_devices_node, list);
6319 list_del(&node_detected_dev->list);
6320 dev = node_detected_dev->dev;
6321 kfree(node_detected_dev);
6322 rdev = md_import_device(dev,0, 90);
6326 if (test_bit(Faulty, &rdev->flags)) {
6330 set_bit(AutoDetected, &rdev->flags);
6331 list_add(&rdev->same_set, &pending_raid_disks);
6335 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6336 i_scanned, i_passed);
6338 autorun_devices(part);
6341 #endif /* !MODULE */
6343 static __exit void md_exit(void)
6346 struct list_head *tmp;
6348 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6349 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6351 unregister_blkdev(MAJOR_NR,"md");
6352 unregister_blkdev(mdp_major, "mdp");
6353 unregister_reboot_notifier(&md_notifier);
6354 unregister_sysctl_table(raid_table_header);
6355 remove_proc_entry("mdstat", NULL);
6356 for_each_mddev(mddev, tmp) {
6357 struct gendisk *disk = mddev->gendisk;
6360 export_array(mddev);
6363 mddev->gendisk = NULL;
6368 subsys_initcall(md_init);
6369 module_exit(md_exit)
6371 static int get_ro(char *buffer, struct kernel_param *kp)
6373 return sprintf(buffer, "%d", start_readonly);
6375 static int set_ro(const char *val, struct kernel_param *kp)
6378 int num = simple_strtoul(val, &e, 10);
6379 if (*val && (*e == '\0' || *e == '\n')) {
6380 start_readonly = num;
6386 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6387 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6390 EXPORT_SYMBOL(register_md_personality);
6391 EXPORT_SYMBOL(unregister_md_personality);
6392 EXPORT_SYMBOL(md_error);
6393 EXPORT_SYMBOL(md_done_sync);
6394 EXPORT_SYMBOL(md_write_start);
6395 EXPORT_SYMBOL(md_write_end);
6396 EXPORT_SYMBOL(md_register_thread);
6397 EXPORT_SYMBOL(md_unregister_thread);
6398 EXPORT_SYMBOL(md_wakeup_thread);
6399 EXPORT_SYMBOL(md_check_recovery);
6400 MODULE_LICENSE("GPL");
6402 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);