2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/kthread.h>
36 #include <linux/raid/md.h>
37 #include <linux/raid/bitmap.h>
38 #include <linux/sysctl.h>
39 #include <linux/buffer_head.h> /* for invalidate_bdev */
40 #include <linux/poll.h>
41 #include <linux/ctype.h>
42 #include <linux/hdreg.h>
43 #include <linux/proc_fs.h>
44 #include <linux/random.h>
45 #include <linux/reboot.h>
46 #include <linux/file.h>
47 #include <linux/delay.h>
49 #define MAJOR_NR MD_MAJOR
51 /* 63 partitions with the alternate major number (mdp) */
52 #define MdpMinorShift 6
55 #define dprintk(x...) ((void)(DEBUG && printk(x)))
59 static void autostart_arrays(int part);
62 static LIST_HEAD(pers_list);
63 static DEFINE_SPINLOCK(pers_lock);
65 static void md_print_devices(void);
67 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
69 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
72 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
73 * is 1000 KB/sec, so the extra system load does not show up that much.
74 * Increase it if you want to have more _guaranteed_ speed. Note that
75 * the RAID driver will use the maximum available bandwidth if the IO
76 * subsystem is idle. There is also an 'absolute maximum' reconstruction
77 * speed limit - in case reconstruction slows down your system despite
80 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
81 * or /sys/block/mdX/md/sync_speed_{min,max}
84 static int sysctl_speed_limit_min = 1000;
85 static int sysctl_speed_limit_max = 200000;
86 static inline int speed_min(mddev_t *mddev)
88 return mddev->sync_speed_min ?
89 mddev->sync_speed_min : sysctl_speed_limit_min;
92 static inline int speed_max(mddev_t *mddev)
94 return mddev->sync_speed_max ?
95 mddev->sync_speed_max : sysctl_speed_limit_max;
98 static struct ctl_table_header *raid_table_header;
100 static ctl_table raid_table[] = {
102 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
103 .procname = "speed_limit_min",
104 .data = &sysctl_speed_limit_min,
105 .maxlen = sizeof(int),
106 .mode = S_IRUGO|S_IWUSR,
107 .proc_handler = &proc_dointvec,
110 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
111 .procname = "speed_limit_max",
112 .data = &sysctl_speed_limit_max,
113 .maxlen = sizeof(int),
114 .mode = S_IRUGO|S_IWUSR,
115 .proc_handler = &proc_dointvec,
120 static ctl_table raid_dir_table[] = {
122 .ctl_name = DEV_RAID,
125 .mode = S_IRUGO|S_IXUGO,
131 static ctl_table raid_root_table[] = {
137 .child = raid_dir_table,
142 static struct block_device_operations md_fops;
144 static int start_readonly;
147 * We have a system wide 'event count' that is incremented
148 * on any 'interesting' event, and readers of /proc/mdstat
149 * can use 'poll' or 'select' to find out when the event
153 * start array, stop array, error, add device, remove device,
154 * start build, activate spare
156 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
157 static atomic_t md_event_count;
158 void md_new_event(mddev_t *mddev)
160 atomic_inc(&md_event_count);
161 wake_up(&md_event_waiters);
163 EXPORT_SYMBOL_GPL(md_new_event);
165 /* Alternate version that can be called from interrupts
166 * when calling sysfs_notify isn't needed.
168 static void md_new_event_inintr(mddev_t *mddev)
170 atomic_inc(&md_event_count);
171 wake_up(&md_event_waiters);
175 * Enables to iterate over all existing md arrays
176 * all_mddevs_lock protects this list.
178 static LIST_HEAD(all_mddevs);
179 static DEFINE_SPINLOCK(all_mddevs_lock);
183 * iterates through all used mddevs in the system.
184 * We take care to grab the all_mddevs_lock whenever navigating
185 * the list, and to always hold a refcount when unlocked.
186 * Any code which breaks out of this loop while own
187 * a reference to the current mddev and must mddev_put it.
189 #define for_each_mddev(mddev,tmp) \
191 for (({ spin_lock(&all_mddevs_lock); \
192 tmp = all_mddevs.next; \
194 ({ if (tmp != &all_mddevs) \
195 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
196 spin_unlock(&all_mddevs_lock); \
197 if (mddev) mddev_put(mddev); \
198 mddev = list_entry(tmp, mddev_t, all_mddevs); \
199 tmp != &all_mddevs;}); \
200 ({ spin_lock(&all_mddevs_lock); \
205 static int md_fail_request(struct request_queue *q, struct bio *bio)
211 static inline mddev_t *mddev_get(mddev_t *mddev)
213 atomic_inc(&mddev->active);
217 static void mddev_put(mddev_t *mddev)
219 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
221 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
222 list_del(&mddev->all_mddevs);
223 spin_unlock(&all_mddevs_lock);
224 blk_cleanup_queue(mddev->queue);
225 if (mddev->sysfs_state)
226 sysfs_put(mddev->sysfs_state);
227 mddev->sysfs_state = NULL;
228 kobject_put(&mddev->kobj);
230 spin_unlock(&all_mddevs_lock);
233 static mddev_t * mddev_find(dev_t unit)
235 mddev_t *mddev, *new = NULL;
238 spin_lock(&all_mddevs_lock);
239 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
240 if (mddev->unit == unit) {
242 spin_unlock(&all_mddevs_lock);
248 list_add(&new->all_mddevs, &all_mddevs);
249 spin_unlock(&all_mddevs_lock);
252 spin_unlock(&all_mddevs_lock);
254 new = kzalloc(sizeof(*new), GFP_KERNEL);
259 if (MAJOR(unit) == MD_MAJOR)
260 new->md_minor = MINOR(unit);
262 new->md_minor = MINOR(unit) >> MdpMinorShift;
264 mutex_init(&new->reconfig_mutex);
265 INIT_LIST_HEAD(&new->disks);
266 INIT_LIST_HEAD(&new->all_mddevs);
267 init_timer(&new->safemode_timer);
268 atomic_set(&new->active, 1);
269 atomic_set(&new->openers, 0);
270 spin_lock_init(&new->write_lock);
271 init_waitqueue_head(&new->sb_wait);
272 init_waitqueue_head(&new->recovery_wait);
273 new->reshape_position = MaxSector;
275 new->resync_max = MaxSector;
276 new->level = LEVEL_NONE;
278 new->queue = blk_alloc_queue(GFP_KERNEL);
283 /* Can be unlocked because the queue is new: no concurrency */
284 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, new->queue);
286 blk_queue_make_request(new->queue, md_fail_request);
291 static inline int mddev_lock(mddev_t * mddev)
293 return mutex_lock_interruptible(&mddev->reconfig_mutex);
296 static inline int mddev_trylock(mddev_t * mddev)
298 return mutex_trylock(&mddev->reconfig_mutex);
301 static inline void mddev_unlock(mddev_t * mddev)
303 mutex_unlock(&mddev->reconfig_mutex);
305 md_wakeup_thread(mddev->thread);
308 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
312 list_for_each_entry(rdev, &mddev->disks, same_set)
313 if (rdev->desc_nr == nr)
319 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
323 list_for_each_entry(rdev, &mddev->disks, same_set)
324 if (rdev->bdev->bd_dev == dev)
330 static struct mdk_personality *find_pers(int level, char *clevel)
332 struct mdk_personality *pers;
333 list_for_each_entry(pers, &pers_list, list) {
334 if (level != LEVEL_NONE && pers->level == level)
336 if (strcmp(pers->name, clevel)==0)
342 /* return the offset of the super block in 512byte sectors */
343 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
345 sector_t num_sectors = bdev->bd_inode->i_size / 512;
346 return MD_NEW_SIZE_SECTORS(num_sectors);
349 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
351 sector_t num_sectors = rdev->sb_start;
354 num_sectors &= ~((sector_t)chunk_size/512 - 1);
358 static int alloc_disk_sb(mdk_rdev_t * rdev)
363 rdev->sb_page = alloc_page(GFP_KERNEL);
364 if (!rdev->sb_page) {
365 printk(KERN_ALERT "md: out of memory.\n");
372 static void free_disk_sb(mdk_rdev_t * rdev)
375 put_page(rdev->sb_page);
377 rdev->sb_page = NULL;
384 static void super_written(struct bio *bio, int error)
386 mdk_rdev_t *rdev = bio->bi_private;
387 mddev_t *mddev = rdev->mddev;
389 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
390 printk("md: super_written gets error=%d, uptodate=%d\n",
391 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
392 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
393 md_error(mddev, rdev);
396 if (atomic_dec_and_test(&mddev->pending_writes))
397 wake_up(&mddev->sb_wait);
401 static void super_written_barrier(struct bio *bio, int error)
403 struct bio *bio2 = bio->bi_private;
404 mdk_rdev_t *rdev = bio2->bi_private;
405 mddev_t *mddev = rdev->mddev;
407 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
408 error == -EOPNOTSUPP) {
410 /* barriers don't appear to be supported :-( */
411 set_bit(BarriersNotsupp, &rdev->flags);
412 mddev->barriers_work = 0;
413 spin_lock_irqsave(&mddev->write_lock, flags);
414 bio2->bi_next = mddev->biolist;
415 mddev->biolist = bio2;
416 spin_unlock_irqrestore(&mddev->write_lock, flags);
417 wake_up(&mddev->sb_wait);
421 bio->bi_private = rdev;
422 super_written(bio, error);
426 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
427 sector_t sector, int size, struct page *page)
429 /* write first size bytes of page to sector of rdev
430 * Increment mddev->pending_writes before returning
431 * and decrement it on completion, waking up sb_wait
432 * if zero is reached.
433 * If an error occurred, call md_error
435 * As we might need to resubmit the request if BIO_RW_BARRIER
436 * causes ENOTSUPP, we allocate a spare bio...
438 struct bio *bio = bio_alloc(GFP_NOIO, 1);
439 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
441 bio->bi_bdev = rdev->bdev;
442 bio->bi_sector = sector;
443 bio_add_page(bio, page, size, 0);
444 bio->bi_private = rdev;
445 bio->bi_end_io = super_written;
448 atomic_inc(&mddev->pending_writes);
449 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
451 rw |= (1<<BIO_RW_BARRIER);
452 rbio = bio_clone(bio, GFP_NOIO);
453 rbio->bi_private = bio;
454 rbio->bi_end_io = super_written_barrier;
455 submit_bio(rw, rbio);
460 void md_super_wait(mddev_t *mddev)
462 /* wait for all superblock writes that were scheduled to complete.
463 * if any had to be retried (due to BARRIER problems), retry them
467 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
468 if (atomic_read(&mddev->pending_writes)==0)
470 while (mddev->biolist) {
472 spin_lock_irq(&mddev->write_lock);
473 bio = mddev->biolist;
474 mddev->biolist = bio->bi_next ;
476 spin_unlock_irq(&mddev->write_lock);
477 submit_bio(bio->bi_rw, bio);
481 finish_wait(&mddev->sb_wait, &wq);
484 static void bi_complete(struct bio *bio, int error)
486 complete((struct completion*)bio->bi_private);
489 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
490 struct page *page, int rw)
492 struct bio *bio = bio_alloc(GFP_NOIO, 1);
493 struct completion event;
496 rw |= (1 << BIO_RW_SYNC);
499 bio->bi_sector = sector;
500 bio_add_page(bio, page, size, 0);
501 init_completion(&event);
502 bio->bi_private = &event;
503 bio->bi_end_io = bi_complete;
505 wait_for_completion(&event);
507 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
511 EXPORT_SYMBOL_GPL(sync_page_io);
513 static int read_disk_sb(mdk_rdev_t * rdev, int size)
515 char b[BDEVNAME_SIZE];
516 if (!rdev->sb_page) {
524 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
530 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
531 bdevname(rdev->bdev,b));
535 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
537 return sb1->set_uuid0 == sb2->set_uuid0 &&
538 sb1->set_uuid1 == sb2->set_uuid1 &&
539 sb1->set_uuid2 == sb2->set_uuid2 &&
540 sb1->set_uuid3 == sb2->set_uuid3;
543 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
546 mdp_super_t *tmp1, *tmp2;
548 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
549 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
551 if (!tmp1 || !tmp2) {
553 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
561 * nr_disks is not constant
566 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
574 static u32 md_csum_fold(u32 csum)
576 csum = (csum & 0xffff) + (csum >> 16);
577 return (csum & 0xffff) + (csum >> 16);
580 static unsigned int calc_sb_csum(mdp_super_t * sb)
583 u32 *sb32 = (u32*)sb;
585 unsigned int disk_csum, csum;
587 disk_csum = sb->sb_csum;
590 for (i = 0; i < MD_SB_BYTES/4 ; i++)
592 csum = (newcsum & 0xffffffff) + (newcsum>>32);
596 /* This used to use csum_partial, which was wrong for several
597 * reasons including that different results are returned on
598 * different architectures. It isn't critical that we get exactly
599 * the same return value as before (we always csum_fold before
600 * testing, and that removes any differences). However as we
601 * know that csum_partial always returned a 16bit value on
602 * alphas, do a fold to maximise conformity to previous behaviour.
604 sb->sb_csum = md_csum_fold(disk_csum);
606 sb->sb_csum = disk_csum;
613 * Handle superblock details.
614 * We want to be able to handle multiple superblock formats
615 * so we have a common interface to them all, and an array of
616 * different handlers.
617 * We rely on user-space to write the initial superblock, and support
618 * reading and updating of superblocks.
619 * Interface methods are:
620 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
621 * loads and validates a superblock on dev.
622 * if refdev != NULL, compare superblocks on both devices
624 * 0 - dev has a superblock that is compatible with refdev
625 * 1 - dev has a superblock that is compatible and newer than refdev
626 * so dev should be used as the refdev in future
627 * -EINVAL superblock incompatible or invalid
628 * -othererror e.g. -EIO
630 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
631 * Verify that dev is acceptable into mddev.
632 * The first time, mddev->raid_disks will be 0, and data from
633 * dev should be merged in. Subsequent calls check that dev
634 * is new enough. Return 0 or -EINVAL
636 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
637 * Update the superblock for rdev with data in mddev
638 * This does not write to disc.
644 struct module *owner;
645 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
647 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
648 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
649 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
650 sector_t num_sectors);
654 * load_super for 0.90.0
656 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
658 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
663 * Calculate the position of the superblock (512byte sectors),
664 * it's at the end of the disk.
666 * It also happens to be a multiple of 4Kb.
668 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
670 ret = read_disk_sb(rdev, MD_SB_BYTES);
675 bdevname(rdev->bdev, b);
676 sb = (mdp_super_t*)page_address(rdev->sb_page);
678 if (sb->md_magic != MD_SB_MAGIC) {
679 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
684 if (sb->major_version != 0 ||
685 sb->minor_version < 90 ||
686 sb->minor_version > 91) {
687 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
688 sb->major_version, sb->minor_version,
693 if (sb->raid_disks <= 0)
696 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
697 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
702 rdev->preferred_minor = sb->md_minor;
703 rdev->data_offset = 0;
704 rdev->sb_size = MD_SB_BYTES;
706 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
707 if (sb->level != 1 && sb->level != 4
708 && sb->level != 5 && sb->level != 6
709 && sb->level != 10) {
710 /* FIXME use a better test */
712 "md: bitmaps not supported for this level.\n");
717 if (sb->level == LEVEL_MULTIPATH)
720 rdev->desc_nr = sb->this_disk.number;
726 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
727 if (!uuid_equal(refsb, sb)) {
728 printk(KERN_WARNING "md: %s has different UUID to %s\n",
729 b, bdevname(refdev->bdev,b2));
732 if (!sb_equal(refsb, sb)) {
733 printk(KERN_WARNING "md: %s has same UUID"
734 " but different superblock to %s\n",
735 b, bdevname(refdev->bdev, b2));
739 ev2 = md_event(refsb);
745 rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2;
747 if (rdev->size < sb->size && sb->level > 1)
748 /* "this cannot possibly happen" ... */
756 * validate_super for 0.90.0
758 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
761 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
762 __u64 ev1 = md_event(sb);
764 rdev->raid_disk = -1;
765 clear_bit(Faulty, &rdev->flags);
766 clear_bit(In_sync, &rdev->flags);
767 clear_bit(WriteMostly, &rdev->flags);
768 clear_bit(BarriersNotsupp, &rdev->flags);
770 if (mddev->raid_disks == 0) {
771 mddev->major_version = 0;
772 mddev->minor_version = sb->minor_version;
773 mddev->patch_version = sb->patch_version;
775 mddev->chunk_size = sb->chunk_size;
776 mddev->ctime = sb->ctime;
777 mddev->utime = sb->utime;
778 mddev->level = sb->level;
779 mddev->clevel[0] = 0;
780 mddev->layout = sb->layout;
781 mddev->raid_disks = sb->raid_disks;
782 mddev->size = sb->size;
784 mddev->bitmap_offset = 0;
785 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
787 if (mddev->minor_version >= 91) {
788 mddev->reshape_position = sb->reshape_position;
789 mddev->delta_disks = sb->delta_disks;
790 mddev->new_level = sb->new_level;
791 mddev->new_layout = sb->new_layout;
792 mddev->new_chunk = sb->new_chunk;
794 mddev->reshape_position = MaxSector;
795 mddev->delta_disks = 0;
796 mddev->new_level = mddev->level;
797 mddev->new_layout = mddev->layout;
798 mddev->new_chunk = mddev->chunk_size;
801 if (sb->state & (1<<MD_SB_CLEAN))
802 mddev->recovery_cp = MaxSector;
804 if (sb->events_hi == sb->cp_events_hi &&
805 sb->events_lo == sb->cp_events_lo) {
806 mddev->recovery_cp = sb->recovery_cp;
808 mddev->recovery_cp = 0;
811 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
812 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
813 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
814 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
816 mddev->max_disks = MD_SB_DISKS;
818 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
819 mddev->bitmap_file == NULL)
820 mddev->bitmap_offset = mddev->default_bitmap_offset;
822 } else if (mddev->pers == NULL) {
823 /* Insist on good event counter while assembling */
825 if (ev1 < mddev->events)
827 } else if (mddev->bitmap) {
828 /* if adding to array with a bitmap, then we can accept an
829 * older device ... but not too old.
831 if (ev1 < mddev->bitmap->events_cleared)
834 if (ev1 < mddev->events)
835 /* just a hot-add of a new device, leave raid_disk at -1 */
839 if (mddev->level != LEVEL_MULTIPATH) {
840 desc = sb->disks + rdev->desc_nr;
842 if (desc->state & (1<<MD_DISK_FAULTY))
843 set_bit(Faulty, &rdev->flags);
844 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
845 desc->raid_disk < mddev->raid_disks */) {
846 set_bit(In_sync, &rdev->flags);
847 rdev->raid_disk = desc->raid_disk;
849 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
850 set_bit(WriteMostly, &rdev->flags);
851 } else /* MULTIPATH are always insync */
852 set_bit(In_sync, &rdev->flags);
857 * sync_super for 0.90.0
859 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
863 int next_spare = mddev->raid_disks;
866 /* make rdev->sb match mddev data..
869 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
870 * 3/ any empty disks < next_spare become removed
872 * disks[0] gets initialised to REMOVED because
873 * we cannot be sure from other fields if it has
874 * been initialised or not.
877 int active=0, working=0,failed=0,spare=0,nr_disks=0;
879 rdev->sb_size = MD_SB_BYTES;
881 sb = (mdp_super_t*)page_address(rdev->sb_page);
883 memset(sb, 0, sizeof(*sb));
885 sb->md_magic = MD_SB_MAGIC;
886 sb->major_version = mddev->major_version;
887 sb->patch_version = mddev->patch_version;
888 sb->gvalid_words = 0; /* ignored */
889 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
890 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
891 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
892 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
894 sb->ctime = mddev->ctime;
895 sb->level = mddev->level;
896 sb->size = mddev->size;
897 sb->raid_disks = mddev->raid_disks;
898 sb->md_minor = mddev->md_minor;
899 sb->not_persistent = 0;
900 sb->utime = mddev->utime;
902 sb->events_hi = (mddev->events>>32);
903 sb->events_lo = (u32)mddev->events;
905 if (mddev->reshape_position == MaxSector)
906 sb->minor_version = 90;
908 sb->minor_version = 91;
909 sb->reshape_position = mddev->reshape_position;
910 sb->new_level = mddev->new_level;
911 sb->delta_disks = mddev->delta_disks;
912 sb->new_layout = mddev->new_layout;
913 sb->new_chunk = mddev->new_chunk;
915 mddev->minor_version = sb->minor_version;
918 sb->recovery_cp = mddev->recovery_cp;
919 sb->cp_events_hi = (mddev->events>>32);
920 sb->cp_events_lo = (u32)mddev->events;
921 if (mddev->recovery_cp == MaxSector)
922 sb->state = (1<< MD_SB_CLEAN);
926 sb->layout = mddev->layout;
927 sb->chunk_size = mddev->chunk_size;
929 if (mddev->bitmap && mddev->bitmap_file == NULL)
930 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
932 sb->disks[0].state = (1<<MD_DISK_REMOVED);
933 list_for_each_entry(rdev2, &mddev->disks, same_set) {
936 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
937 && !test_bit(Faulty, &rdev2->flags))
938 desc_nr = rdev2->raid_disk;
940 desc_nr = next_spare++;
941 rdev2->desc_nr = desc_nr;
942 d = &sb->disks[rdev2->desc_nr];
944 d->number = rdev2->desc_nr;
945 d->major = MAJOR(rdev2->bdev->bd_dev);
946 d->minor = MINOR(rdev2->bdev->bd_dev);
947 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
948 && !test_bit(Faulty, &rdev2->flags))
949 d->raid_disk = rdev2->raid_disk;
951 d->raid_disk = rdev2->desc_nr; /* compatibility */
952 if (test_bit(Faulty, &rdev2->flags))
953 d->state = (1<<MD_DISK_FAULTY);
954 else if (test_bit(In_sync, &rdev2->flags)) {
955 d->state = (1<<MD_DISK_ACTIVE);
956 d->state |= (1<<MD_DISK_SYNC);
964 if (test_bit(WriteMostly, &rdev2->flags))
965 d->state |= (1<<MD_DISK_WRITEMOSTLY);
967 /* now set the "removed" and "faulty" bits on any missing devices */
968 for (i=0 ; i < mddev->raid_disks ; i++) {
969 mdp_disk_t *d = &sb->disks[i];
970 if (d->state == 0 && d->number == 0) {
973 d->state = (1<<MD_DISK_REMOVED);
974 d->state |= (1<<MD_DISK_FAULTY);
978 sb->nr_disks = nr_disks;
979 sb->active_disks = active;
980 sb->working_disks = working;
981 sb->failed_disks = failed;
982 sb->spare_disks = spare;
984 sb->this_disk = sb->disks[rdev->desc_nr];
985 sb->sb_csum = calc_sb_csum(sb);
989 * rdev_size_change for 0.90.0
991 static unsigned long long
992 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
994 if (num_sectors && num_sectors < rdev->mddev->size * 2)
995 return 0; /* component must fit device */
996 if (rdev->mddev->bitmap_offset)
997 return 0; /* can't move bitmap */
998 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
999 if (!num_sectors || num_sectors > rdev->sb_start)
1000 num_sectors = rdev->sb_start;
1001 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1003 md_super_wait(rdev->mddev);
1004 return num_sectors / 2; /* kB for sysfs */
1009 * version 1 superblock
1012 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1016 unsigned long long newcsum;
1017 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1018 __le32 *isuper = (__le32*)sb;
1021 disk_csum = sb->sb_csum;
1024 for (i=0; size>=4; size -= 4 )
1025 newcsum += le32_to_cpu(*isuper++);
1028 newcsum += le16_to_cpu(*(__le16*) isuper);
1030 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1031 sb->sb_csum = disk_csum;
1032 return cpu_to_le32(csum);
1035 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1037 struct mdp_superblock_1 *sb;
1040 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1044 * Calculate the position of the superblock in 512byte sectors.
1045 * It is always aligned to a 4K boundary and
1046 * depeding on minor_version, it can be:
1047 * 0: At least 8K, but less than 12K, from end of device
1048 * 1: At start of device
1049 * 2: 4K from start of device.
1051 switch(minor_version) {
1053 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1055 sb_start &= ~(sector_t)(4*2-1);
1066 rdev->sb_start = sb_start;
1068 /* superblock is rarely larger than 1K, but it can be larger,
1069 * and it is safe to read 4k, so we do that
1071 ret = read_disk_sb(rdev, 4096);
1072 if (ret) return ret;
1075 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1077 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1078 sb->major_version != cpu_to_le32(1) ||
1079 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1080 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1081 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1084 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1085 printk("md: invalid superblock checksum on %s\n",
1086 bdevname(rdev->bdev,b));
1089 if (le64_to_cpu(sb->data_size) < 10) {
1090 printk("md: data_size too small on %s\n",
1091 bdevname(rdev->bdev,b));
1094 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1095 if (sb->level != cpu_to_le32(1) &&
1096 sb->level != cpu_to_le32(4) &&
1097 sb->level != cpu_to_le32(5) &&
1098 sb->level != cpu_to_le32(6) &&
1099 sb->level != cpu_to_le32(10)) {
1101 "md: bitmaps not supported for this level.\n");
1106 rdev->preferred_minor = 0xffff;
1107 rdev->data_offset = le64_to_cpu(sb->data_offset);
1108 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1110 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1111 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1112 if (rdev->sb_size & bmask)
1113 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1116 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1119 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1122 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1128 struct mdp_superblock_1 *refsb =
1129 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1131 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1132 sb->level != refsb->level ||
1133 sb->layout != refsb->layout ||
1134 sb->chunksize != refsb->chunksize) {
1135 printk(KERN_WARNING "md: %s has strangely different"
1136 " superblock to %s\n",
1137 bdevname(rdev->bdev,b),
1138 bdevname(refdev->bdev,b2));
1141 ev1 = le64_to_cpu(sb->events);
1142 ev2 = le64_to_cpu(refsb->events);
1150 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1152 rdev->size = rdev->sb_start / 2;
1153 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1155 rdev->size = le64_to_cpu(sb->data_size)/2;
1156 if (le32_to_cpu(sb->chunksize))
1157 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1159 if (le64_to_cpu(sb->size) > rdev->size*2)
1164 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1166 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1167 __u64 ev1 = le64_to_cpu(sb->events);
1169 rdev->raid_disk = -1;
1170 clear_bit(Faulty, &rdev->flags);
1171 clear_bit(In_sync, &rdev->flags);
1172 clear_bit(WriteMostly, &rdev->flags);
1173 clear_bit(BarriersNotsupp, &rdev->flags);
1175 if (mddev->raid_disks == 0) {
1176 mddev->major_version = 1;
1177 mddev->patch_version = 0;
1178 mddev->external = 0;
1179 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1180 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1181 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1182 mddev->level = le32_to_cpu(sb->level);
1183 mddev->clevel[0] = 0;
1184 mddev->layout = le32_to_cpu(sb->layout);
1185 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1186 mddev->size = le64_to_cpu(sb->size)/2;
1187 mddev->events = ev1;
1188 mddev->bitmap_offset = 0;
1189 mddev->default_bitmap_offset = 1024 >> 9;
1191 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1192 memcpy(mddev->uuid, sb->set_uuid, 16);
1194 mddev->max_disks = (4096-256)/2;
1196 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1197 mddev->bitmap_file == NULL )
1198 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1200 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1201 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1202 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1203 mddev->new_level = le32_to_cpu(sb->new_level);
1204 mddev->new_layout = le32_to_cpu(sb->new_layout);
1205 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1207 mddev->reshape_position = MaxSector;
1208 mddev->delta_disks = 0;
1209 mddev->new_level = mddev->level;
1210 mddev->new_layout = mddev->layout;
1211 mddev->new_chunk = mddev->chunk_size;
1214 } else if (mddev->pers == NULL) {
1215 /* Insist of good event counter while assembling */
1217 if (ev1 < mddev->events)
1219 } else if (mddev->bitmap) {
1220 /* If adding to array with a bitmap, then we can accept an
1221 * older device, but not too old.
1223 if (ev1 < mddev->bitmap->events_cleared)
1226 if (ev1 < mddev->events)
1227 /* just a hot-add of a new device, leave raid_disk at -1 */
1230 if (mddev->level != LEVEL_MULTIPATH) {
1232 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1234 case 0xffff: /* spare */
1236 case 0xfffe: /* faulty */
1237 set_bit(Faulty, &rdev->flags);
1240 if ((le32_to_cpu(sb->feature_map) &
1241 MD_FEATURE_RECOVERY_OFFSET))
1242 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1244 set_bit(In_sync, &rdev->flags);
1245 rdev->raid_disk = role;
1248 if (sb->devflags & WriteMostly1)
1249 set_bit(WriteMostly, &rdev->flags);
1250 } else /* MULTIPATH are always insync */
1251 set_bit(In_sync, &rdev->flags);
1256 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1258 struct mdp_superblock_1 *sb;
1261 /* make rdev->sb match mddev and rdev data. */
1263 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1265 sb->feature_map = 0;
1267 sb->recovery_offset = cpu_to_le64(0);
1268 memset(sb->pad1, 0, sizeof(sb->pad1));
1269 memset(sb->pad2, 0, sizeof(sb->pad2));
1270 memset(sb->pad3, 0, sizeof(sb->pad3));
1272 sb->utime = cpu_to_le64((__u64)mddev->utime);
1273 sb->events = cpu_to_le64(mddev->events);
1275 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1277 sb->resync_offset = cpu_to_le64(0);
1279 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1281 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1282 sb->size = cpu_to_le64(mddev->size<<1);
1284 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1285 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1286 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1289 if (rdev->raid_disk >= 0 &&
1290 !test_bit(In_sync, &rdev->flags) &&
1291 rdev->recovery_offset > 0) {
1292 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1293 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1296 if (mddev->reshape_position != MaxSector) {
1297 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1298 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1299 sb->new_layout = cpu_to_le32(mddev->new_layout);
1300 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1301 sb->new_level = cpu_to_le32(mddev->new_level);
1302 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1306 list_for_each_entry(rdev2, &mddev->disks, same_set)
1307 if (rdev2->desc_nr+1 > max_dev)
1308 max_dev = rdev2->desc_nr+1;
1310 if (max_dev > le32_to_cpu(sb->max_dev))
1311 sb->max_dev = cpu_to_le32(max_dev);
1312 for (i=0; i<max_dev;i++)
1313 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1315 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1317 if (test_bit(Faulty, &rdev2->flags))
1318 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1319 else if (test_bit(In_sync, &rdev2->flags))
1320 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1321 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1322 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1324 sb->dev_roles[i] = cpu_to_le16(0xffff);
1327 sb->sb_csum = calc_sb_1_csum(sb);
1330 static unsigned long long
1331 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1333 struct mdp_superblock_1 *sb;
1334 sector_t max_sectors;
1335 if (num_sectors && num_sectors < rdev->mddev->size * 2)
1336 return 0; /* component must fit device */
1337 if (rdev->sb_start < rdev->data_offset) {
1338 /* minor versions 1 and 2; superblock before data */
1339 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1340 max_sectors -= rdev->data_offset;
1341 if (!num_sectors || num_sectors > max_sectors)
1342 num_sectors = max_sectors;
1343 } else if (rdev->mddev->bitmap_offset) {
1344 /* minor version 0 with bitmap we can't move */
1347 /* minor version 0; superblock after data */
1349 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1350 sb_start &= ~(sector_t)(4*2 - 1);
1351 max_sectors = rdev->size * 2 + sb_start - rdev->sb_start;
1352 if (!num_sectors || num_sectors > max_sectors)
1353 num_sectors = max_sectors;
1354 rdev->sb_start = sb_start;
1356 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1357 sb->data_size = cpu_to_le64(num_sectors);
1358 sb->super_offset = rdev->sb_start;
1359 sb->sb_csum = calc_sb_1_csum(sb);
1360 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1362 md_super_wait(rdev->mddev);
1363 return num_sectors / 2; /* kB for sysfs */
1366 static struct super_type super_types[] = {
1369 .owner = THIS_MODULE,
1370 .load_super = super_90_load,
1371 .validate_super = super_90_validate,
1372 .sync_super = super_90_sync,
1373 .rdev_size_change = super_90_rdev_size_change,
1377 .owner = THIS_MODULE,
1378 .load_super = super_1_load,
1379 .validate_super = super_1_validate,
1380 .sync_super = super_1_sync,
1381 .rdev_size_change = super_1_rdev_size_change,
1385 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1387 mdk_rdev_t *rdev, *rdev2;
1390 rdev_for_each_rcu(rdev, mddev1)
1391 rdev_for_each_rcu(rdev2, mddev2)
1392 if (rdev->bdev->bd_contains ==
1393 rdev2->bdev->bd_contains) {
1401 static LIST_HEAD(pending_raid_disks);
1403 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1405 char b[BDEVNAME_SIZE];
1415 /* prevent duplicates */
1416 if (find_rdev(mddev, rdev->bdev->bd_dev))
1419 /* make sure rdev->size exceeds mddev->size */
1420 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1422 /* Cannot change size, so fail
1423 * If mddev->level <= 0, then we don't care
1424 * about aligning sizes (e.g. linear)
1426 if (mddev->level > 0)
1429 mddev->size = rdev->size;
1432 /* Verify rdev->desc_nr is unique.
1433 * If it is -1, assign a free number, else
1434 * check number is not in use
1436 if (rdev->desc_nr < 0) {
1438 if (mddev->pers) choice = mddev->raid_disks;
1439 while (find_rdev_nr(mddev, choice))
1441 rdev->desc_nr = choice;
1443 if (find_rdev_nr(mddev, rdev->desc_nr))
1446 bdevname(rdev->bdev,b);
1447 while ( (s=strchr(b, '/')) != NULL)
1450 rdev->mddev = mddev;
1451 printk(KERN_INFO "md: bind<%s>\n", b);
1453 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1456 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1457 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1458 kobject_del(&rdev->kobj);
1461 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1463 list_add_rcu(&rdev->same_set, &mddev->disks);
1464 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1468 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1473 static void md_delayed_delete(struct work_struct *ws)
1475 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1476 kobject_del(&rdev->kobj);
1477 kobject_put(&rdev->kobj);
1480 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1482 char b[BDEVNAME_SIZE];
1487 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1488 list_del_rcu(&rdev->same_set);
1489 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1491 sysfs_remove_link(&rdev->kobj, "block");
1492 sysfs_put(rdev->sysfs_state);
1493 rdev->sysfs_state = NULL;
1494 /* We need to delay this, otherwise we can deadlock when
1495 * writing to 'remove' to "dev/state". We also need
1496 * to delay it due to rcu usage.
1499 INIT_WORK(&rdev->del_work, md_delayed_delete);
1500 kobject_get(&rdev->kobj);
1501 schedule_work(&rdev->del_work);
1505 * prevent the device from being mounted, repartitioned or
1506 * otherwise reused by a RAID array (or any other kernel
1507 * subsystem), by bd_claiming the device.
1509 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1512 struct block_device *bdev;
1513 char b[BDEVNAME_SIZE];
1515 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1517 printk(KERN_ERR "md: could not open %s.\n",
1518 __bdevname(dev, b));
1519 return PTR_ERR(bdev);
1521 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1523 printk(KERN_ERR "md: could not bd_claim %s.\n",
1525 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1529 set_bit(AllReserved, &rdev->flags);
1534 static void unlock_rdev(mdk_rdev_t *rdev)
1536 struct block_device *bdev = rdev->bdev;
1541 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1544 void md_autodetect_dev(dev_t dev);
1546 static void export_rdev(mdk_rdev_t * rdev)
1548 char b[BDEVNAME_SIZE];
1549 printk(KERN_INFO "md: export_rdev(%s)\n",
1550 bdevname(rdev->bdev,b));
1555 if (test_bit(AutoDetected, &rdev->flags))
1556 md_autodetect_dev(rdev->bdev->bd_dev);
1559 kobject_put(&rdev->kobj);
1562 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1564 unbind_rdev_from_array(rdev);
1568 static void export_array(mddev_t *mddev)
1570 mdk_rdev_t *rdev, *tmp;
1572 rdev_for_each(rdev, tmp, mddev) {
1577 kick_rdev_from_array(rdev);
1579 if (!list_empty(&mddev->disks))
1581 mddev->raid_disks = 0;
1582 mddev->major_version = 0;
1585 static void print_desc(mdp_disk_t *desc)
1587 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1588 desc->major,desc->minor,desc->raid_disk,desc->state);
1591 static void print_sb(mdp_super_t *sb)
1596 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1597 sb->major_version, sb->minor_version, sb->patch_version,
1598 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1600 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1601 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1602 sb->md_minor, sb->layout, sb->chunk_size);
1603 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1604 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1605 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1606 sb->failed_disks, sb->spare_disks,
1607 sb->sb_csum, (unsigned long)sb->events_lo);
1610 for (i = 0; i < MD_SB_DISKS; i++) {
1613 desc = sb->disks + i;
1614 if (desc->number || desc->major || desc->minor ||
1615 desc->raid_disk || (desc->state && (desc->state != 4))) {
1616 printk(" D %2d: ", i);
1620 printk(KERN_INFO "md: THIS: ");
1621 print_desc(&sb->this_disk);
1625 static void print_rdev(mdk_rdev_t *rdev)
1627 char b[BDEVNAME_SIZE];
1628 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1629 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1630 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1632 if (rdev->sb_loaded) {
1633 printk(KERN_INFO "md: rdev superblock:\n");
1634 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1636 printk(KERN_INFO "md: no rdev superblock!\n");
1639 static void md_print_devices(void)
1641 struct list_head *tmp;
1644 char b[BDEVNAME_SIZE];
1647 printk("md: **********************************\n");
1648 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1649 printk("md: **********************************\n");
1650 for_each_mddev(mddev, tmp) {
1653 bitmap_print_sb(mddev->bitmap);
1655 printk("%s: ", mdname(mddev));
1656 list_for_each_entry(rdev, &mddev->disks, same_set)
1657 printk("<%s>", bdevname(rdev->bdev,b));
1660 list_for_each_entry(rdev, &mddev->disks, same_set)
1663 printk("md: **********************************\n");
1668 static void sync_sbs(mddev_t * mddev, int nospares)
1670 /* Update each superblock (in-memory image), but
1671 * if we are allowed to, skip spares which already
1672 * have the right event counter, or have one earlier
1673 * (which would mean they aren't being marked as dirty
1674 * with the rest of the array)
1678 list_for_each_entry(rdev, &mddev->disks, same_set) {
1679 if (rdev->sb_events == mddev->events ||
1681 rdev->raid_disk < 0 &&
1682 (rdev->sb_events&1)==0 &&
1683 rdev->sb_events+1 == mddev->events)) {
1684 /* Don't update this superblock */
1685 rdev->sb_loaded = 2;
1687 super_types[mddev->major_version].
1688 sync_super(mddev, rdev);
1689 rdev->sb_loaded = 1;
1694 static void md_update_sb(mddev_t * mddev, int force_change)
1700 if (mddev->external)
1703 spin_lock_irq(&mddev->write_lock);
1705 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1706 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1708 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1709 /* just a clean<-> dirty transition, possibly leave spares alone,
1710 * though if events isn't the right even/odd, we will have to do
1716 if (mddev->degraded)
1717 /* If the array is degraded, then skipping spares is both
1718 * dangerous and fairly pointless.
1719 * Dangerous because a device that was removed from the array
1720 * might have a event_count that still looks up-to-date,
1721 * so it can be re-added without a resync.
1722 * Pointless because if there are any spares to skip,
1723 * then a recovery will happen and soon that array won't
1724 * be degraded any more and the spare can go back to sleep then.
1728 sync_req = mddev->in_sync;
1729 mddev->utime = get_seconds();
1731 /* If this is just a dirty<->clean transition, and the array is clean
1732 * and 'events' is odd, we can roll back to the previous clean state */
1734 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1735 && (mddev->events & 1)
1736 && mddev->events != 1)
1739 /* otherwise we have to go forward and ... */
1741 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1742 /* .. if the array isn't clean, insist on an odd 'events' */
1743 if ((mddev->events&1)==0) {
1748 /* otherwise insist on an even 'events' (for clean states) */
1749 if ((mddev->events&1)) {
1756 if (!mddev->events) {
1758 * oops, this 64-bit counter should never wrap.
1759 * Either we are in around ~1 trillion A.C., assuming
1760 * 1 reboot per second, or we have a bug:
1767 * do not write anything to disk if using
1768 * nonpersistent superblocks
1770 if (!mddev->persistent) {
1771 if (!mddev->external)
1772 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1774 spin_unlock_irq(&mddev->write_lock);
1775 wake_up(&mddev->sb_wait);
1778 sync_sbs(mddev, nospares);
1779 spin_unlock_irq(&mddev->write_lock);
1782 "md: updating %s RAID superblock on device (in sync %d)\n",
1783 mdname(mddev),mddev->in_sync);
1785 bitmap_update_sb(mddev->bitmap);
1786 list_for_each_entry(rdev, &mddev->disks, same_set) {
1787 char b[BDEVNAME_SIZE];
1788 dprintk(KERN_INFO "md: ");
1789 if (rdev->sb_loaded != 1)
1790 continue; /* no noise on spare devices */
1791 if (test_bit(Faulty, &rdev->flags))
1792 dprintk("(skipping faulty ");
1794 dprintk("%s ", bdevname(rdev->bdev,b));
1795 if (!test_bit(Faulty, &rdev->flags)) {
1796 md_super_write(mddev,rdev,
1797 rdev->sb_start, rdev->sb_size,
1799 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1800 bdevname(rdev->bdev,b),
1801 (unsigned long long)rdev->sb_start);
1802 rdev->sb_events = mddev->events;
1806 if (mddev->level == LEVEL_MULTIPATH)
1807 /* only need to write one superblock... */
1810 md_super_wait(mddev);
1811 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1813 spin_lock_irq(&mddev->write_lock);
1814 if (mddev->in_sync != sync_req ||
1815 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1816 /* have to write it out again */
1817 spin_unlock_irq(&mddev->write_lock);
1820 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1821 spin_unlock_irq(&mddev->write_lock);
1822 wake_up(&mddev->sb_wait);
1826 /* words written to sysfs files may, or may not, be \n terminated.
1827 * We want to accept with case. For this we use cmd_match.
1829 static int cmd_match(const char *cmd, const char *str)
1831 /* See if cmd, written into a sysfs file, matches
1832 * str. They must either be the same, or cmd can
1833 * have a trailing newline
1835 while (*cmd && *str && *cmd == *str) {
1846 struct rdev_sysfs_entry {
1847 struct attribute attr;
1848 ssize_t (*show)(mdk_rdev_t *, char *);
1849 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1853 state_show(mdk_rdev_t *rdev, char *page)
1858 if (test_bit(Faulty, &rdev->flags)) {
1859 len+= sprintf(page+len, "%sfaulty",sep);
1862 if (test_bit(In_sync, &rdev->flags)) {
1863 len += sprintf(page+len, "%sin_sync",sep);
1866 if (test_bit(WriteMostly, &rdev->flags)) {
1867 len += sprintf(page+len, "%swrite_mostly",sep);
1870 if (test_bit(Blocked, &rdev->flags)) {
1871 len += sprintf(page+len, "%sblocked", sep);
1874 if (!test_bit(Faulty, &rdev->flags) &&
1875 !test_bit(In_sync, &rdev->flags)) {
1876 len += sprintf(page+len, "%sspare", sep);
1879 return len+sprintf(page+len, "\n");
1883 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1886 * faulty - simulates and error
1887 * remove - disconnects the device
1888 * writemostly - sets write_mostly
1889 * -writemostly - clears write_mostly
1890 * blocked - sets the Blocked flag
1891 * -blocked - clears the Blocked flag
1894 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1895 md_error(rdev->mddev, rdev);
1897 } else if (cmd_match(buf, "remove")) {
1898 if (rdev->raid_disk >= 0)
1901 mddev_t *mddev = rdev->mddev;
1902 kick_rdev_from_array(rdev);
1904 md_update_sb(mddev, 1);
1905 md_new_event(mddev);
1908 } else if (cmd_match(buf, "writemostly")) {
1909 set_bit(WriteMostly, &rdev->flags);
1911 } else if (cmd_match(buf, "-writemostly")) {
1912 clear_bit(WriteMostly, &rdev->flags);
1914 } else if (cmd_match(buf, "blocked")) {
1915 set_bit(Blocked, &rdev->flags);
1917 } else if (cmd_match(buf, "-blocked")) {
1918 clear_bit(Blocked, &rdev->flags);
1919 wake_up(&rdev->blocked_wait);
1920 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1921 md_wakeup_thread(rdev->mddev->thread);
1925 if (!err && rdev->sysfs_state)
1926 sysfs_notify_dirent(rdev->sysfs_state);
1927 return err ? err : len;
1929 static struct rdev_sysfs_entry rdev_state =
1930 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1933 errors_show(mdk_rdev_t *rdev, char *page)
1935 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1939 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1942 unsigned long n = simple_strtoul(buf, &e, 10);
1943 if (*buf && (*e == 0 || *e == '\n')) {
1944 atomic_set(&rdev->corrected_errors, n);
1949 static struct rdev_sysfs_entry rdev_errors =
1950 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1953 slot_show(mdk_rdev_t *rdev, char *page)
1955 if (rdev->raid_disk < 0)
1956 return sprintf(page, "none\n");
1958 return sprintf(page, "%d\n", rdev->raid_disk);
1962 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1967 int slot = simple_strtoul(buf, &e, 10);
1968 if (strncmp(buf, "none", 4)==0)
1970 else if (e==buf || (*e && *e!= '\n'))
1972 if (rdev->mddev->pers && slot == -1) {
1973 /* Setting 'slot' on an active array requires also
1974 * updating the 'rd%d' link, and communicating
1975 * with the personality with ->hot_*_disk.
1976 * For now we only support removing
1977 * failed/spare devices. This normally happens automatically,
1978 * but not when the metadata is externally managed.
1980 if (rdev->raid_disk == -1)
1982 /* personality does all needed checks */
1983 if (rdev->mddev->pers->hot_add_disk == NULL)
1985 err = rdev->mddev->pers->
1986 hot_remove_disk(rdev->mddev, rdev->raid_disk);
1989 sprintf(nm, "rd%d", rdev->raid_disk);
1990 sysfs_remove_link(&rdev->mddev->kobj, nm);
1991 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1992 md_wakeup_thread(rdev->mddev->thread);
1993 } else if (rdev->mddev->pers) {
1995 /* Activating a spare .. or possibly reactivating
1996 * if we every get bitmaps working here.
1999 if (rdev->raid_disk != -1)
2002 if (rdev->mddev->pers->hot_add_disk == NULL)
2005 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2006 if (rdev2->raid_disk == slot)
2009 rdev->raid_disk = slot;
2010 if (test_bit(In_sync, &rdev->flags))
2011 rdev->saved_raid_disk = slot;
2013 rdev->saved_raid_disk = -1;
2014 err = rdev->mddev->pers->
2015 hot_add_disk(rdev->mddev, rdev);
2017 rdev->raid_disk = -1;
2020 sysfs_notify_dirent(rdev->sysfs_state);
2021 sprintf(nm, "rd%d", rdev->raid_disk);
2022 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2024 "md: cannot register "
2026 nm, mdname(rdev->mddev));
2028 /* don't wakeup anyone, leave that to userspace. */
2030 if (slot >= rdev->mddev->raid_disks)
2032 rdev->raid_disk = slot;
2033 /* assume it is working */
2034 clear_bit(Faulty, &rdev->flags);
2035 clear_bit(WriteMostly, &rdev->flags);
2036 set_bit(In_sync, &rdev->flags);
2037 sysfs_notify_dirent(rdev->sysfs_state);
2043 static struct rdev_sysfs_entry rdev_slot =
2044 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2047 offset_show(mdk_rdev_t *rdev, char *page)
2049 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2053 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2056 unsigned long long offset = simple_strtoull(buf, &e, 10);
2057 if (e==buf || (*e && *e != '\n'))
2059 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2061 if (rdev->size && rdev->mddev->external)
2062 /* Must set offset before size, so overlap checks
2065 rdev->data_offset = offset;
2069 static struct rdev_sysfs_entry rdev_offset =
2070 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2073 rdev_size_show(mdk_rdev_t *rdev, char *page)
2075 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2078 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2080 /* check if two start/length pairs overlap */
2089 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2091 unsigned long long size;
2092 unsigned long long oldsize = rdev->size;
2093 mddev_t *my_mddev = rdev->mddev;
2095 if (strict_strtoull(buf, 10, &size) < 0)
2097 if (my_mddev->pers && rdev->raid_disk >= 0) {
2098 if (my_mddev->persistent) {
2099 size = super_types[my_mddev->major_version].
2100 rdev_size_change(rdev, size * 2);
2104 size = (rdev->bdev->bd_inode->i_size >> 10);
2105 size -= rdev->data_offset/2;
2108 if (size < my_mddev->size)
2109 return -EINVAL; /* component must fit device */
2112 if (size > oldsize && my_mddev->external) {
2113 /* need to check that all other rdevs with the same ->bdev
2114 * do not overlap. We need to unlock the mddev to avoid
2115 * a deadlock. We have already changed rdev->size, and if
2116 * we have to change it back, we will have the lock again.
2120 struct list_head *tmp;
2122 mddev_unlock(my_mddev);
2123 for_each_mddev(mddev, tmp) {
2127 list_for_each_entry(rdev2, &mddev->disks, same_set)
2128 if (test_bit(AllReserved, &rdev2->flags) ||
2129 (rdev->bdev == rdev2->bdev &&
2131 overlaps(rdev->data_offset, rdev->size * 2,
2133 rdev2->size * 2))) {
2137 mddev_unlock(mddev);
2143 mddev_lock(my_mddev);
2145 /* Someone else could have slipped in a size
2146 * change here, but doing so is just silly.
2147 * We put oldsize back because we *know* it is
2148 * safe, and trust userspace not to race with
2151 rdev->size = oldsize;
2158 static struct rdev_sysfs_entry rdev_size =
2159 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2161 static struct attribute *rdev_default_attrs[] = {
2170 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2172 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2173 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2174 mddev_t *mddev = rdev->mddev;
2180 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2182 if (rdev->mddev == NULL)
2185 rv = entry->show(rdev, page);
2186 mddev_unlock(mddev);
2192 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2193 const char *page, size_t length)
2195 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2196 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2198 mddev_t *mddev = rdev->mddev;
2202 if (!capable(CAP_SYS_ADMIN))
2204 rv = mddev ? mddev_lock(mddev): -EBUSY;
2206 if (rdev->mddev == NULL)
2209 rv = entry->store(rdev, page, length);
2210 mddev_unlock(mddev);
2215 static void rdev_free(struct kobject *ko)
2217 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2220 static struct sysfs_ops rdev_sysfs_ops = {
2221 .show = rdev_attr_show,
2222 .store = rdev_attr_store,
2224 static struct kobj_type rdev_ktype = {
2225 .release = rdev_free,
2226 .sysfs_ops = &rdev_sysfs_ops,
2227 .default_attrs = rdev_default_attrs,
2231 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2233 * mark the device faulty if:
2235 * - the device is nonexistent (zero size)
2236 * - the device has no valid superblock
2238 * a faulty rdev _never_ has rdev->sb set.
2240 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2242 char b[BDEVNAME_SIZE];
2247 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2249 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2250 return ERR_PTR(-ENOMEM);
2253 if ((err = alloc_disk_sb(rdev)))
2256 err = lock_rdev(rdev, newdev, super_format == -2);
2260 kobject_init(&rdev->kobj, &rdev_ktype);
2263 rdev->saved_raid_disk = -1;
2264 rdev->raid_disk = -1;
2266 rdev->data_offset = 0;
2267 rdev->sb_events = 0;
2268 atomic_set(&rdev->nr_pending, 0);
2269 atomic_set(&rdev->read_errors, 0);
2270 atomic_set(&rdev->corrected_errors, 0);
2272 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2275 "md: %s has zero or unknown size, marking faulty!\n",
2276 bdevname(rdev->bdev,b));
2281 if (super_format >= 0) {
2282 err = super_types[super_format].
2283 load_super(rdev, NULL, super_minor);
2284 if (err == -EINVAL) {
2286 "md: %s does not have a valid v%d.%d "
2287 "superblock, not importing!\n",
2288 bdevname(rdev->bdev,b),
2289 super_format, super_minor);
2294 "md: could not read %s's sb, not importing!\n",
2295 bdevname(rdev->bdev,b));
2300 INIT_LIST_HEAD(&rdev->same_set);
2301 init_waitqueue_head(&rdev->blocked_wait);
2306 if (rdev->sb_page) {
2312 return ERR_PTR(err);
2316 * Check a full RAID array for plausibility
2320 static void analyze_sbs(mddev_t * mddev)
2323 mdk_rdev_t *rdev, *freshest, *tmp;
2324 char b[BDEVNAME_SIZE];
2327 rdev_for_each(rdev, tmp, mddev)
2328 switch (super_types[mddev->major_version].
2329 load_super(rdev, freshest, mddev->minor_version)) {
2337 "md: fatal superblock inconsistency in %s"
2338 " -- removing from array\n",
2339 bdevname(rdev->bdev,b));
2340 kick_rdev_from_array(rdev);
2344 super_types[mddev->major_version].
2345 validate_super(mddev, freshest);
2348 rdev_for_each(rdev, tmp, mddev) {
2349 if (rdev != freshest)
2350 if (super_types[mddev->major_version].
2351 validate_super(mddev, rdev)) {
2352 printk(KERN_WARNING "md: kicking non-fresh %s"
2354 bdevname(rdev->bdev,b));
2355 kick_rdev_from_array(rdev);
2358 if (mddev->level == LEVEL_MULTIPATH) {
2359 rdev->desc_nr = i++;
2360 rdev->raid_disk = rdev->desc_nr;
2361 set_bit(In_sync, &rdev->flags);
2362 } else if (rdev->raid_disk >= mddev->raid_disks) {
2363 rdev->raid_disk = -1;
2364 clear_bit(In_sync, &rdev->flags);
2370 if (mddev->recovery_cp != MaxSector &&
2372 printk(KERN_ERR "md: %s: raid array is not clean"
2373 " -- starting background reconstruction\n",
2378 static void md_safemode_timeout(unsigned long data);
2381 safe_delay_show(mddev_t *mddev, char *page)
2383 int msec = (mddev->safemode_delay*1000)/HZ;
2384 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2387 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2395 /* remove a period, and count digits after it */
2396 if (len >= sizeof(buf))
2398 strlcpy(buf, cbuf, sizeof(buf));
2399 for (i=0; i<len; i++) {
2401 if (isdigit(buf[i])) {
2406 } else if (buf[i] == '.') {
2411 if (strict_strtoul(buf, 10, &msec) < 0)
2413 msec = (msec * 1000) / scale;
2415 mddev->safemode_delay = 0;
2417 unsigned long old_delay = mddev->safemode_delay;
2418 mddev->safemode_delay = (msec*HZ)/1000;
2419 if (mddev->safemode_delay == 0)
2420 mddev->safemode_delay = 1;
2421 if (mddev->safemode_delay < old_delay)
2422 md_safemode_timeout((unsigned long)mddev);
2426 static struct md_sysfs_entry md_safe_delay =
2427 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2430 level_show(mddev_t *mddev, char *page)
2432 struct mdk_personality *p = mddev->pers;
2434 return sprintf(page, "%s\n", p->name);
2435 else if (mddev->clevel[0])
2436 return sprintf(page, "%s\n", mddev->clevel);
2437 else if (mddev->level != LEVEL_NONE)
2438 return sprintf(page, "%d\n", mddev->level);
2444 level_store(mddev_t *mddev, const char *buf, size_t len)
2451 if (len >= sizeof(mddev->clevel))
2453 strncpy(mddev->clevel, buf, len);
2454 if (mddev->clevel[len-1] == '\n')
2456 mddev->clevel[len] = 0;
2457 mddev->level = LEVEL_NONE;
2461 static struct md_sysfs_entry md_level =
2462 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2466 layout_show(mddev_t *mddev, char *page)
2468 /* just a number, not meaningful for all levels */
2469 if (mddev->reshape_position != MaxSector &&
2470 mddev->layout != mddev->new_layout)
2471 return sprintf(page, "%d (%d)\n",
2472 mddev->new_layout, mddev->layout);
2473 return sprintf(page, "%d\n", mddev->layout);
2477 layout_store(mddev_t *mddev, const char *buf, size_t len)
2480 unsigned long n = simple_strtoul(buf, &e, 10);
2482 if (!*buf || (*e && *e != '\n'))
2487 if (mddev->reshape_position != MaxSector)
2488 mddev->new_layout = n;
2493 static struct md_sysfs_entry md_layout =
2494 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2498 raid_disks_show(mddev_t *mddev, char *page)
2500 if (mddev->raid_disks == 0)
2502 if (mddev->reshape_position != MaxSector &&
2503 mddev->delta_disks != 0)
2504 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2505 mddev->raid_disks - mddev->delta_disks);
2506 return sprintf(page, "%d\n", mddev->raid_disks);
2509 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2512 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2516 unsigned long n = simple_strtoul(buf, &e, 10);
2518 if (!*buf || (*e && *e != '\n'))
2522 rv = update_raid_disks(mddev, n);
2523 else if (mddev->reshape_position != MaxSector) {
2524 int olddisks = mddev->raid_disks - mddev->delta_disks;
2525 mddev->delta_disks = n - olddisks;
2526 mddev->raid_disks = n;
2528 mddev->raid_disks = n;
2529 return rv ? rv : len;
2531 static struct md_sysfs_entry md_raid_disks =
2532 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2535 chunk_size_show(mddev_t *mddev, char *page)
2537 if (mddev->reshape_position != MaxSector &&
2538 mddev->chunk_size != mddev->new_chunk)
2539 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2541 return sprintf(page, "%d\n", mddev->chunk_size);
2545 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2547 /* can only set chunk_size if array is not yet active */
2549 unsigned long n = simple_strtoul(buf, &e, 10);
2551 if (!*buf || (*e && *e != '\n'))
2556 else if (mddev->reshape_position != MaxSector)
2557 mddev->new_chunk = n;
2559 mddev->chunk_size = n;
2562 static struct md_sysfs_entry md_chunk_size =
2563 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2566 resync_start_show(mddev_t *mddev, char *page)
2568 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2572 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2575 unsigned long long n = simple_strtoull(buf, &e, 10);
2579 if (!*buf || (*e && *e != '\n'))
2582 mddev->recovery_cp = n;
2585 static struct md_sysfs_entry md_resync_start =
2586 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2589 * The array state can be:
2592 * No devices, no size, no level
2593 * Equivalent to STOP_ARRAY ioctl
2595 * May have some settings, but array is not active
2596 * all IO results in error
2597 * When written, doesn't tear down array, but just stops it
2598 * suspended (not supported yet)
2599 * All IO requests will block. The array can be reconfigured.
2600 * Writing this, if accepted, will block until array is quiescent
2602 * no resync can happen. no superblocks get written.
2603 * write requests fail
2605 * like readonly, but behaves like 'clean' on a write request.
2607 * clean - no pending writes, but otherwise active.
2608 * When written to inactive array, starts without resync
2609 * If a write request arrives then
2610 * if metadata is known, mark 'dirty' and switch to 'active'.
2611 * if not known, block and switch to write-pending
2612 * If written to an active array that has pending writes, then fails.
2614 * fully active: IO and resync can be happening.
2615 * When written to inactive array, starts with resync
2618 * clean, but writes are blocked waiting for 'active' to be written.
2621 * like active, but no writes have been seen for a while (100msec).
2624 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2625 write_pending, active_idle, bad_word};
2626 static char *array_states[] = {
2627 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2628 "write-pending", "active-idle", NULL };
2630 static int match_word(const char *word, char **list)
2633 for (n=0; list[n]; n++)
2634 if (cmd_match(word, list[n]))
2640 array_state_show(mddev_t *mddev, char *page)
2642 enum array_state st = inactive;
2655 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2657 else if (mddev->safemode)
2663 if (list_empty(&mddev->disks) &&
2664 mddev->raid_disks == 0 &&
2670 return sprintf(page, "%s\n", array_states[st]);
2673 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
2674 static int do_md_run(mddev_t * mddev);
2675 static int restart_array(mddev_t *mddev);
2678 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2681 enum array_state st = match_word(buf, array_states);
2686 /* stopping an active array */
2687 if (atomic_read(&mddev->openers) > 0)
2689 err = do_md_stop(mddev, 0, 0);
2692 /* stopping an active array */
2694 if (atomic_read(&mddev->openers) > 0)
2696 err = do_md_stop(mddev, 2, 0);
2698 err = 0; /* already inactive */
2701 break; /* not supported yet */
2704 err = do_md_stop(mddev, 1, 0);
2707 set_disk_ro(mddev->gendisk, 1);
2708 err = do_md_run(mddev);
2714 err = do_md_stop(mddev, 1, 0);
2715 else if (mddev->ro == 1)
2716 err = restart_array(mddev);
2719 set_disk_ro(mddev->gendisk, 0);
2723 err = do_md_run(mddev);
2728 restart_array(mddev);
2729 spin_lock_irq(&mddev->write_lock);
2730 if (atomic_read(&mddev->writes_pending) == 0) {
2731 if (mddev->in_sync == 0) {
2733 if (mddev->safemode == 1)
2734 mddev->safemode = 0;
2735 if (mddev->persistent)
2736 set_bit(MD_CHANGE_CLEAN,
2742 spin_unlock_irq(&mddev->write_lock);
2745 mddev->recovery_cp = MaxSector;
2746 err = do_md_run(mddev);
2751 restart_array(mddev);
2752 if (mddev->external)
2753 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2754 wake_up(&mddev->sb_wait);
2758 set_disk_ro(mddev->gendisk, 0);
2759 err = do_md_run(mddev);
2764 /* these cannot be set */
2770 sysfs_notify_dirent(mddev->sysfs_state);
2774 static struct md_sysfs_entry md_array_state =
2775 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2778 null_show(mddev_t *mddev, char *page)
2784 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2786 /* buf must be %d:%d\n? giving major and minor numbers */
2787 /* The new device is added to the array.
2788 * If the array has a persistent superblock, we read the
2789 * superblock to initialise info and check validity.
2790 * Otherwise, only checking done is that in bind_rdev_to_array,
2791 * which mainly checks size.
2794 int major = simple_strtoul(buf, &e, 10);
2800 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2802 minor = simple_strtoul(e+1, &e, 10);
2803 if (*e && *e != '\n')
2805 dev = MKDEV(major, minor);
2806 if (major != MAJOR(dev) ||
2807 minor != MINOR(dev))
2811 if (mddev->persistent) {
2812 rdev = md_import_device(dev, mddev->major_version,
2813 mddev->minor_version);
2814 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2815 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2816 mdk_rdev_t, same_set);
2817 err = super_types[mddev->major_version]
2818 .load_super(rdev, rdev0, mddev->minor_version);
2822 } else if (mddev->external)
2823 rdev = md_import_device(dev, -2, -1);
2825 rdev = md_import_device(dev, -1, -1);
2828 return PTR_ERR(rdev);
2829 err = bind_rdev_to_array(rdev, mddev);
2833 return err ? err : len;
2836 static struct md_sysfs_entry md_new_device =
2837 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2840 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2843 unsigned long chunk, end_chunk;
2847 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2849 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2850 if (buf == end) break;
2851 if (*end == '-') { /* range */
2853 end_chunk = simple_strtoul(buf, &end, 0);
2854 if (buf == end) break;
2856 if (*end && !isspace(*end)) break;
2857 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2859 while (isspace(*buf)) buf++;
2861 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2866 static struct md_sysfs_entry md_bitmap =
2867 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2870 size_show(mddev_t *mddev, char *page)
2872 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2875 static int update_size(mddev_t *mddev, sector_t num_sectors);
2878 size_store(mddev_t *mddev, const char *buf, size_t len)
2880 /* If array is inactive, we can reduce the component size, but
2881 * not increase it (except from 0).
2882 * If array is active, we can try an on-line resize
2886 unsigned long long size = simple_strtoull(buf, &e, 10);
2887 if (!*buf || *buf == '\n' ||
2892 err = update_size(mddev, size * 2);
2893 md_update_sb(mddev, 1);
2895 if (mddev->size == 0 ||
2901 return err ? err : len;
2904 static struct md_sysfs_entry md_size =
2905 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2910 * 'none' for arrays with no metadata (good luck...)
2911 * 'external' for arrays with externally managed metadata,
2912 * or N.M for internally known formats
2915 metadata_show(mddev_t *mddev, char *page)
2917 if (mddev->persistent)
2918 return sprintf(page, "%d.%d\n",
2919 mddev->major_version, mddev->minor_version);
2920 else if (mddev->external)
2921 return sprintf(page, "external:%s\n", mddev->metadata_type);
2923 return sprintf(page, "none\n");
2927 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2931 /* Changing the details of 'external' metadata is
2932 * always permitted. Otherwise there must be
2933 * no devices attached to the array.
2935 if (mddev->external && strncmp(buf, "external:", 9) == 0)
2937 else if (!list_empty(&mddev->disks))
2940 if (cmd_match(buf, "none")) {
2941 mddev->persistent = 0;
2942 mddev->external = 0;
2943 mddev->major_version = 0;
2944 mddev->minor_version = 90;
2947 if (strncmp(buf, "external:", 9) == 0) {
2948 size_t namelen = len-9;
2949 if (namelen >= sizeof(mddev->metadata_type))
2950 namelen = sizeof(mddev->metadata_type)-1;
2951 strncpy(mddev->metadata_type, buf+9, namelen);
2952 mddev->metadata_type[namelen] = 0;
2953 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2954 mddev->metadata_type[--namelen] = 0;
2955 mddev->persistent = 0;
2956 mddev->external = 1;
2957 mddev->major_version = 0;
2958 mddev->minor_version = 90;
2961 major = simple_strtoul(buf, &e, 10);
2962 if (e==buf || *e != '.')
2965 minor = simple_strtoul(buf, &e, 10);
2966 if (e==buf || (*e && *e != '\n') )
2968 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2970 mddev->major_version = major;
2971 mddev->minor_version = minor;
2972 mddev->persistent = 1;
2973 mddev->external = 0;
2977 static struct md_sysfs_entry md_metadata =
2978 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2981 action_show(mddev_t *mddev, char *page)
2983 char *type = "idle";
2984 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2985 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2986 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2988 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2989 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2991 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2995 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
2998 return sprintf(page, "%s\n", type);
3002 action_store(mddev_t *mddev, const char *page, size_t len)
3004 if (!mddev->pers || !mddev->pers->sync_request)
3007 if (cmd_match(page, "idle")) {
3008 if (mddev->sync_thread) {
3009 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3010 md_unregister_thread(mddev->sync_thread);
3011 mddev->sync_thread = NULL;
3012 mddev->recovery = 0;
3014 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3015 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3017 else if (cmd_match(page, "resync"))
3018 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3019 else if (cmd_match(page, "recover")) {
3020 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3021 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3022 } else if (cmd_match(page, "reshape")) {
3024 if (mddev->pers->start_reshape == NULL)
3026 err = mddev->pers->start_reshape(mddev);
3029 sysfs_notify(&mddev->kobj, NULL, "degraded");
3031 if (cmd_match(page, "check"))
3032 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3033 else if (!cmd_match(page, "repair"))
3035 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3036 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3038 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3039 md_wakeup_thread(mddev->thread);
3040 sysfs_notify_dirent(mddev->sysfs_action);
3045 mismatch_cnt_show(mddev_t *mddev, char *page)
3047 return sprintf(page, "%llu\n",
3048 (unsigned long long) mddev->resync_mismatches);
3051 static struct md_sysfs_entry md_scan_mode =
3052 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3055 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3058 sync_min_show(mddev_t *mddev, char *page)
3060 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3061 mddev->sync_speed_min ? "local": "system");
3065 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3069 if (strncmp(buf, "system", 6)==0) {
3070 mddev->sync_speed_min = 0;
3073 min = simple_strtoul(buf, &e, 10);
3074 if (buf == e || (*e && *e != '\n') || min <= 0)
3076 mddev->sync_speed_min = min;
3080 static struct md_sysfs_entry md_sync_min =
3081 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3084 sync_max_show(mddev_t *mddev, char *page)
3086 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3087 mddev->sync_speed_max ? "local": "system");
3091 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3095 if (strncmp(buf, "system", 6)==0) {
3096 mddev->sync_speed_max = 0;
3099 max = simple_strtoul(buf, &e, 10);
3100 if (buf == e || (*e && *e != '\n') || max <= 0)
3102 mddev->sync_speed_max = max;
3106 static struct md_sysfs_entry md_sync_max =
3107 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3110 degraded_show(mddev_t *mddev, char *page)
3112 return sprintf(page, "%d\n", mddev->degraded);
3114 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3117 sync_force_parallel_show(mddev_t *mddev, char *page)
3119 return sprintf(page, "%d\n", mddev->parallel_resync);
3123 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3127 if (strict_strtol(buf, 10, &n))
3130 if (n != 0 && n != 1)
3133 mddev->parallel_resync = n;
3135 if (mddev->sync_thread)
3136 wake_up(&resync_wait);
3141 /* force parallel resync, even with shared block devices */
3142 static struct md_sysfs_entry md_sync_force_parallel =
3143 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3144 sync_force_parallel_show, sync_force_parallel_store);
3147 sync_speed_show(mddev_t *mddev, char *page)
3149 unsigned long resync, dt, db;
3150 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3151 dt = (jiffies - mddev->resync_mark) / HZ;
3153 db = resync - mddev->resync_mark_cnt;
3154 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3157 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3160 sync_completed_show(mddev_t *mddev, char *page)
3162 unsigned long max_blocks, resync;
3164 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3165 max_blocks = mddev->resync_max_sectors;
3167 max_blocks = mddev->size << 1;
3169 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3170 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3173 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3176 min_sync_show(mddev_t *mddev, char *page)
3178 return sprintf(page, "%llu\n",
3179 (unsigned long long)mddev->resync_min);
3182 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3184 unsigned long long min;
3185 if (strict_strtoull(buf, 10, &min))
3187 if (min > mddev->resync_max)
3189 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3192 /* Must be a multiple of chunk_size */
3193 if (mddev->chunk_size) {
3194 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3197 mddev->resync_min = min;
3202 static struct md_sysfs_entry md_min_sync =
3203 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3206 max_sync_show(mddev_t *mddev, char *page)
3208 if (mddev->resync_max == MaxSector)
3209 return sprintf(page, "max\n");
3211 return sprintf(page, "%llu\n",
3212 (unsigned long long)mddev->resync_max);
3215 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3217 if (strncmp(buf, "max", 3) == 0)
3218 mddev->resync_max = MaxSector;
3220 unsigned long long max;
3221 if (strict_strtoull(buf, 10, &max))
3223 if (max < mddev->resync_min)
3225 if (max < mddev->resync_max &&
3226 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3229 /* Must be a multiple of chunk_size */
3230 if (mddev->chunk_size) {
3231 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3234 mddev->resync_max = max;
3236 wake_up(&mddev->recovery_wait);
3240 static struct md_sysfs_entry md_max_sync =
3241 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3244 suspend_lo_show(mddev_t *mddev, char *page)
3246 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3250 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3253 unsigned long long new = simple_strtoull(buf, &e, 10);
3255 if (mddev->pers->quiesce == NULL)
3257 if (buf == e || (*e && *e != '\n'))
3259 if (new >= mddev->suspend_hi ||
3260 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3261 mddev->suspend_lo = new;
3262 mddev->pers->quiesce(mddev, 2);
3267 static struct md_sysfs_entry md_suspend_lo =
3268 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3272 suspend_hi_show(mddev_t *mddev, char *page)
3274 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3278 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3281 unsigned long long new = simple_strtoull(buf, &e, 10);
3283 if (mddev->pers->quiesce == NULL)
3285 if (buf == e || (*e && *e != '\n'))
3287 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3288 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3289 mddev->suspend_hi = new;
3290 mddev->pers->quiesce(mddev, 1);
3291 mddev->pers->quiesce(mddev, 0);
3296 static struct md_sysfs_entry md_suspend_hi =
3297 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3300 reshape_position_show(mddev_t *mddev, char *page)
3302 if (mddev->reshape_position != MaxSector)
3303 return sprintf(page, "%llu\n",
3304 (unsigned long long)mddev->reshape_position);
3305 strcpy(page, "none\n");
3310 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3313 unsigned long long new = simple_strtoull(buf, &e, 10);
3316 if (buf == e || (*e && *e != '\n'))
3318 mddev->reshape_position = new;
3319 mddev->delta_disks = 0;
3320 mddev->new_level = mddev->level;
3321 mddev->new_layout = mddev->layout;
3322 mddev->new_chunk = mddev->chunk_size;
3326 static struct md_sysfs_entry md_reshape_position =
3327 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3328 reshape_position_store);
3331 static struct attribute *md_default_attrs[] = {
3334 &md_raid_disks.attr,
3335 &md_chunk_size.attr,
3337 &md_resync_start.attr,
3339 &md_new_device.attr,
3340 &md_safe_delay.attr,
3341 &md_array_state.attr,
3342 &md_reshape_position.attr,
3346 static struct attribute *md_redundancy_attrs[] = {
3348 &md_mismatches.attr,
3351 &md_sync_speed.attr,
3352 &md_sync_force_parallel.attr,
3353 &md_sync_completed.attr,
3356 &md_suspend_lo.attr,
3357 &md_suspend_hi.attr,
3362 static struct attribute_group md_redundancy_group = {
3364 .attrs = md_redundancy_attrs,
3369 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3371 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3372 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3377 rv = mddev_lock(mddev);
3379 rv = entry->show(mddev, page);
3380 mddev_unlock(mddev);
3386 md_attr_store(struct kobject *kobj, struct attribute *attr,
3387 const char *page, size_t length)
3389 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3390 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3395 if (!capable(CAP_SYS_ADMIN))
3397 rv = mddev_lock(mddev);
3399 rv = entry->store(mddev, page, length);
3400 mddev_unlock(mddev);
3405 static void md_free(struct kobject *ko)
3407 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3411 static struct sysfs_ops md_sysfs_ops = {
3412 .show = md_attr_show,
3413 .store = md_attr_store,
3415 static struct kobj_type md_ktype = {
3417 .sysfs_ops = &md_sysfs_ops,
3418 .default_attrs = md_default_attrs,
3423 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3425 static DEFINE_MUTEX(disks_mutex);
3426 mddev_t *mddev = mddev_find(dev);
3427 struct gendisk *disk;
3428 int partitioned = (MAJOR(dev) != MD_MAJOR);
3429 int shift = partitioned ? MdpMinorShift : 0;
3430 int unit = MINOR(dev) >> shift;
3436 mutex_lock(&disks_mutex);
3437 if (mddev->gendisk) {
3438 mutex_unlock(&disks_mutex);
3442 disk = alloc_disk(1 << shift);
3444 mutex_unlock(&disks_mutex);
3448 disk->major = MAJOR(dev);
3449 disk->first_minor = unit << shift;
3451 sprintf(disk->disk_name, "md_d%d", unit);
3453 sprintf(disk->disk_name, "md%d", unit);
3454 disk->fops = &md_fops;
3455 disk->private_data = mddev;
3456 disk->queue = mddev->queue;
3457 /* Allow extended partitions. This makes the
3458 * 'mdp' device redundant, but we can really
3461 disk->flags |= GENHD_FL_EXT_DEVT;
3463 mddev->gendisk = disk;
3464 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3465 &disk_to_dev(disk)->kobj, "%s", "md");
3466 mutex_unlock(&disks_mutex);
3468 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3471 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3472 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
3477 static void md_safemode_timeout(unsigned long data)
3479 mddev_t *mddev = (mddev_t *) data;
3481 if (!atomic_read(&mddev->writes_pending)) {
3482 mddev->safemode = 1;
3483 if (mddev->external)
3484 sysfs_notify_dirent(mddev->sysfs_state);
3486 md_wakeup_thread(mddev->thread);
3489 static int start_dirty_degraded;
3491 static int do_md_run(mddev_t * mddev)
3496 struct gendisk *disk;
3497 struct mdk_personality *pers;
3498 char b[BDEVNAME_SIZE];
3500 if (list_empty(&mddev->disks))
3501 /* cannot run an array with no devices.. */
3508 * Analyze all RAID superblock(s)
3510 if (!mddev->raid_disks) {
3511 if (!mddev->persistent)
3516 chunk_size = mddev->chunk_size;
3519 if (chunk_size > MAX_CHUNK_SIZE) {
3520 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3521 chunk_size, MAX_CHUNK_SIZE);
3525 * chunk-size has to be a power of 2
3527 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3528 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3532 /* devices must have minimum size of one chunk */
3533 list_for_each_entry(rdev, &mddev->disks, same_set) {
3534 if (test_bit(Faulty, &rdev->flags))
3536 if (rdev->size < chunk_size / 1024) {
3538 "md: Dev %s smaller than chunk_size:"
3540 bdevname(rdev->bdev,b),
3541 (unsigned long long)rdev->size,
3548 if (mddev->level != LEVEL_NONE)
3549 request_module("md-level-%d", mddev->level);
3550 else if (mddev->clevel[0])
3551 request_module("md-%s", mddev->clevel);
3554 * Drop all container device buffers, from now on
3555 * the only valid external interface is through the md
3558 list_for_each_entry(rdev, &mddev->disks, same_set) {
3559 if (test_bit(Faulty, &rdev->flags))
3561 sync_blockdev(rdev->bdev);
3562 invalidate_bdev(rdev->bdev);
3564 /* perform some consistency tests on the device.
3565 * We don't want the data to overlap the metadata,
3566 * Internal Bitmap issues has handled elsewhere.
3568 if (rdev->data_offset < rdev->sb_start) {
3570 rdev->data_offset + mddev->size*2
3572 printk("md: %s: data overlaps metadata\n",
3577 if (rdev->sb_start + rdev->sb_size/512
3578 > rdev->data_offset) {
3579 printk("md: %s: metadata overlaps data\n",
3584 sysfs_notify_dirent(rdev->sysfs_state);
3587 md_probe(mddev->unit, NULL, NULL);
3588 disk = mddev->gendisk;
3592 spin_lock(&pers_lock);
3593 pers = find_pers(mddev->level, mddev->clevel);
3594 if (!pers || !try_module_get(pers->owner)) {
3595 spin_unlock(&pers_lock);
3596 if (mddev->level != LEVEL_NONE)
3597 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3600 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3605 spin_unlock(&pers_lock);
3606 mddev->level = pers->level;
3607 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3609 if (mddev->reshape_position != MaxSector &&
3610 pers->start_reshape == NULL) {
3611 /* This personality cannot handle reshaping... */
3613 module_put(pers->owner);
3617 if (pers->sync_request) {
3618 /* Warn if this is a potentially silly
3621 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3625 list_for_each_entry(rdev, &mddev->disks, same_set)
3626 list_for_each_entry(rdev2, &mddev->disks, same_set) {
3628 rdev->bdev->bd_contains ==
3629 rdev2->bdev->bd_contains) {
3631 "%s: WARNING: %s appears to be"
3632 " on the same physical disk as"
3635 bdevname(rdev->bdev,b),
3636 bdevname(rdev2->bdev,b2));
3643 "True protection against single-disk"
3644 " failure might be compromised.\n");
3647 mddev->recovery = 0;
3648 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3649 mddev->barriers_work = 1;
3650 mddev->ok_start_degraded = start_dirty_degraded;
3653 mddev->ro = 2; /* read-only, but switch on first write */
3655 err = mddev->pers->run(mddev);
3657 printk(KERN_ERR "md: pers->run() failed ...\n");
3658 else if (mddev->pers->sync_request) {
3659 err = bitmap_create(mddev);
3661 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3662 mdname(mddev), err);
3663 mddev->pers->stop(mddev);
3667 module_put(mddev->pers->owner);
3669 bitmap_destroy(mddev);
3672 if (mddev->pers->sync_request) {
3673 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3675 "md: cannot register extra attributes for %s\n",
3677 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3678 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3681 atomic_set(&mddev->writes_pending,0);
3682 mddev->safemode = 0;
3683 mddev->safemode_timer.function = md_safemode_timeout;
3684 mddev->safemode_timer.data = (unsigned long) mddev;
3685 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3688 list_for_each_entry(rdev, &mddev->disks, same_set)
3689 if (rdev->raid_disk >= 0) {
3691 sprintf(nm, "rd%d", rdev->raid_disk);
3692 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3693 printk("md: cannot register %s for %s\n",
3697 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3700 md_update_sb(mddev, 0);
3702 set_capacity(disk, mddev->array_sectors);
3704 /* If we call blk_queue_make_request here, it will
3705 * re-initialise max_sectors etc which may have been
3706 * refined inside -> run. So just set the bits we need to set.
3707 * Most initialisation happended when we called
3708 * blk_queue_make_request(..., md_fail_request)
3711 mddev->queue->queuedata = mddev;
3712 mddev->queue->make_request_fn = mddev->pers->make_request;
3714 /* If there is a partially-recovered drive we need to
3715 * start recovery here. If we leave it to md_check_recovery,
3716 * it will remove the drives and not do the right thing
3718 if (mddev->degraded && !mddev->sync_thread) {
3720 list_for_each_entry(rdev, &mddev->disks, same_set)
3721 if (rdev->raid_disk >= 0 &&
3722 !test_bit(In_sync, &rdev->flags) &&
3723 !test_bit(Faulty, &rdev->flags))
3724 /* complete an interrupted recovery */
3726 if (spares && mddev->pers->sync_request) {
3727 mddev->recovery = 0;
3728 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3729 mddev->sync_thread = md_register_thread(md_do_sync,
3732 if (!mddev->sync_thread) {
3733 printk(KERN_ERR "%s: could not start resync"
3736 /* leave the spares where they are, it shouldn't hurt */
3737 mddev->recovery = 0;
3741 md_wakeup_thread(mddev->thread);
3742 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3745 md_new_event(mddev);
3746 sysfs_notify_dirent(mddev->sysfs_state);
3747 if (mddev->sysfs_action)
3748 sysfs_notify_dirent(mddev->sysfs_action);
3749 sysfs_notify(&mddev->kobj, NULL, "degraded");
3750 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
3754 static int restart_array(mddev_t *mddev)
3756 struct gendisk *disk = mddev->gendisk;
3758 /* Complain if it has no devices */
3759 if (list_empty(&mddev->disks))
3765 mddev->safemode = 0;
3767 set_disk_ro(disk, 0);
3768 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3770 /* Kick recovery or resync if necessary */
3771 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3772 md_wakeup_thread(mddev->thread);
3773 md_wakeup_thread(mddev->sync_thread);
3774 sysfs_notify_dirent(mddev->sysfs_state);
3778 /* similar to deny_write_access, but accounts for our holding a reference
3779 * to the file ourselves */
3780 static int deny_bitmap_write_access(struct file * file)
3782 struct inode *inode = file->f_mapping->host;
3784 spin_lock(&inode->i_lock);
3785 if (atomic_read(&inode->i_writecount) > 1) {
3786 spin_unlock(&inode->i_lock);
3789 atomic_set(&inode->i_writecount, -1);
3790 spin_unlock(&inode->i_lock);
3795 static void restore_bitmap_write_access(struct file *file)
3797 struct inode *inode = file->f_mapping->host;
3799 spin_lock(&inode->i_lock);
3800 atomic_set(&inode->i_writecount, 1);
3801 spin_unlock(&inode->i_lock);
3805 * 0 - completely stop and dis-assemble array
3806 * 1 - switch to readonly
3807 * 2 - stop but do not disassemble array
3809 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
3812 struct gendisk *disk = mddev->gendisk;
3814 if (atomic_read(&mddev->openers) > is_open) {
3815 printk("md: %s still in use.\n",mdname(mddev));
3821 if (mddev->sync_thread) {
3822 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3823 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3824 md_unregister_thread(mddev->sync_thread);
3825 mddev->sync_thread = NULL;
3828 del_timer_sync(&mddev->safemode_timer);
3831 case 1: /* readonly */
3837 case 0: /* disassemble */
3839 bitmap_flush(mddev);
3840 md_super_wait(mddev);
3842 set_disk_ro(disk, 0);
3843 blk_queue_make_request(mddev->queue, md_fail_request);
3844 mddev->pers->stop(mddev);
3845 mddev->queue->merge_bvec_fn = NULL;
3846 mddev->queue->unplug_fn = NULL;
3847 mddev->queue->backing_dev_info.congested_fn = NULL;
3848 if (mddev->pers->sync_request) {
3849 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3850 if (mddev->sysfs_action)
3851 sysfs_put(mddev->sysfs_action);
3852 mddev->sysfs_action = NULL;
3854 module_put(mddev->pers->owner);
3856 /* tell userspace to handle 'inactive' */
3857 sysfs_notify_dirent(mddev->sysfs_state);
3859 set_capacity(disk, 0);
3865 if (!mddev->in_sync || mddev->flags) {
3866 /* mark array as shutdown cleanly */
3868 md_update_sb(mddev, 1);
3871 set_disk_ro(disk, 1);
3872 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3876 * Free resources if final stop
3881 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3883 bitmap_destroy(mddev);
3884 if (mddev->bitmap_file) {
3885 restore_bitmap_write_access(mddev->bitmap_file);
3886 fput(mddev->bitmap_file);
3887 mddev->bitmap_file = NULL;
3889 mddev->bitmap_offset = 0;
3891 list_for_each_entry(rdev, &mddev->disks, same_set)
3892 if (rdev->raid_disk >= 0) {
3894 sprintf(nm, "rd%d", rdev->raid_disk);
3895 sysfs_remove_link(&mddev->kobj, nm);
3898 /* make sure all md_delayed_delete calls have finished */
3899 flush_scheduled_work();
3901 export_array(mddev);
3903 mddev->array_sectors = 0;
3905 mddev->raid_disks = 0;
3906 mddev->recovery_cp = 0;
3907 mddev->resync_min = 0;
3908 mddev->resync_max = MaxSector;
3909 mddev->reshape_position = MaxSector;
3910 mddev->external = 0;
3911 mddev->persistent = 0;
3912 mddev->level = LEVEL_NONE;
3913 mddev->clevel[0] = 0;
3916 mddev->metadata_type[0] = 0;
3917 mddev->chunk_size = 0;
3918 mddev->ctime = mddev->utime = 0;
3920 mddev->max_disks = 0;
3922 mddev->delta_disks = 0;
3923 mddev->new_level = LEVEL_NONE;
3924 mddev->new_layout = 0;
3925 mddev->new_chunk = 0;
3926 mddev->curr_resync = 0;
3927 mddev->resync_mismatches = 0;
3928 mddev->suspend_lo = mddev->suspend_hi = 0;
3929 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3930 mddev->recovery = 0;
3933 mddev->degraded = 0;
3934 mddev->barriers_work = 0;
3935 mddev->safemode = 0;
3936 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
3938 } else if (mddev->pers)
3939 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3942 md_new_event(mddev);
3943 sysfs_notify_dirent(mddev->sysfs_state);
3949 static void autorun_array(mddev_t *mddev)
3954 if (list_empty(&mddev->disks))
3957 printk(KERN_INFO "md: running: ");
3959 list_for_each_entry(rdev, &mddev->disks, same_set) {
3960 char b[BDEVNAME_SIZE];
3961 printk("<%s>", bdevname(rdev->bdev,b));
3965 err = do_md_run(mddev);
3967 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3968 do_md_stop(mddev, 0, 0);
3973 * lets try to run arrays based on all disks that have arrived
3974 * until now. (those are in pending_raid_disks)
3976 * the method: pick the first pending disk, collect all disks with
3977 * the same UUID, remove all from the pending list and put them into
3978 * the 'same_array' list. Then order this list based on superblock
3979 * update time (freshest comes first), kick out 'old' disks and
3980 * compare superblocks. If everything's fine then run it.
3982 * If "unit" is allocated, then bump its reference count
3984 static void autorun_devices(int part)
3986 mdk_rdev_t *rdev0, *rdev, *tmp;
3988 char b[BDEVNAME_SIZE];
3990 printk(KERN_INFO "md: autorun ...\n");
3991 while (!list_empty(&pending_raid_disks)) {
3994 LIST_HEAD(candidates);
3995 rdev0 = list_entry(pending_raid_disks.next,
3996 mdk_rdev_t, same_set);
3998 printk(KERN_INFO "md: considering %s ...\n",
3999 bdevname(rdev0->bdev,b));
4000 INIT_LIST_HEAD(&candidates);
4001 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4002 if (super_90_load(rdev, rdev0, 0) >= 0) {
4003 printk(KERN_INFO "md: adding %s ...\n",
4004 bdevname(rdev->bdev,b));
4005 list_move(&rdev->same_set, &candidates);
4008 * now we have a set of devices, with all of them having
4009 * mostly sane superblocks. It's time to allocate the
4013 dev = MKDEV(mdp_major,
4014 rdev0->preferred_minor << MdpMinorShift);
4015 unit = MINOR(dev) >> MdpMinorShift;
4017 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4020 if (rdev0->preferred_minor != unit) {
4021 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4022 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4026 md_probe(dev, NULL, NULL);
4027 mddev = mddev_find(dev);
4028 if (!mddev || !mddev->gendisk) {
4032 "md: cannot allocate memory for md drive.\n");
4035 if (mddev_lock(mddev))
4036 printk(KERN_WARNING "md: %s locked, cannot run\n",
4038 else if (mddev->raid_disks || mddev->major_version
4039 || !list_empty(&mddev->disks)) {
4041 "md: %s already running, cannot run %s\n",
4042 mdname(mddev), bdevname(rdev0->bdev,b));
4043 mddev_unlock(mddev);
4045 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4046 mddev->persistent = 1;
4047 rdev_for_each_list(rdev, tmp, &candidates) {
4048 list_del_init(&rdev->same_set);
4049 if (bind_rdev_to_array(rdev, mddev))
4052 autorun_array(mddev);
4053 mddev_unlock(mddev);
4055 /* on success, candidates will be empty, on error
4058 rdev_for_each_list(rdev, tmp, &candidates) {
4059 list_del_init(&rdev->same_set);
4064 printk(KERN_INFO "md: ... autorun DONE.\n");
4066 #endif /* !MODULE */
4068 static int get_version(void __user * arg)
4072 ver.major = MD_MAJOR_VERSION;
4073 ver.minor = MD_MINOR_VERSION;
4074 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4076 if (copy_to_user(arg, &ver, sizeof(ver)))
4082 static int get_array_info(mddev_t * mddev, void __user * arg)
4084 mdu_array_info_t info;
4085 int nr,working,active,failed,spare;
4088 nr=working=active=failed=spare=0;
4089 list_for_each_entry(rdev, &mddev->disks, same_set) {
4091 if (test_bit(Faulty, &rdev->flags))
4095 if (test_bit(In_sync, &rdev->flags))
4102 info.major_version = mddev->major_version;
4103 info.minor_version = mddev->minor_version;
4104 info.patch_version = MD_PATCHLEVEL_VERSION;
4105 info.ctime = mddev->ctime;
4106 info.level = mddev->level;
4107 info.size = mddev->size;
4108 if (info.size != mddev->size) /* overflow */
4111 info.raid_disks = mddev->raid_disks;
4112 info.md_minor = mddev->md_minor;
4113 info.not_persistent= !mddev->persistent;
4115 info.utime = mddev->utime;
4118 info.state = (1<<MD_SB_CLEAN);
4119 if (mddev->bitmap && mddev->bitmap_offset)
4120 info.state = (1<<MD_SB_BITMAP_PRESENT);
4121 info.active_disks = active;
4122 info.working_disks = working;
4123 info.failed_disks = failed;
4124 info.spare_disks = spare;
4126 info.layout = mddev->layout;
4127 info.chunk_size = mddev->chunk_size;
4129 if (copy_to_user(arg, &info, sizeof(info)))
4135 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4137 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4138 char *ptr, *buf = NULL;
4141 if (md_allow_write(mddev))
4142 file = kmalloc(sizeof(*file), GFP_NOIO);
4144 file = kmalloc(sizeof(*file), GFP_KERNEL);
4149 /* bitmap disabled, zero the first byte and copy out */
4150 if (!mddev->bitmap || !mddev->bitmap->file) {
4151 file->pathname[0] = '\0';
4155 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4159 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4163 strcpy(file->pathname, ptr);
4167 if (copy_to_user(arg, file, sizeof(*file)))
4175 static int get_disk_info(mddev_t * mddev, void __user * arg)
4177 mdu_disk_info_t info;
4180 if (copy_from_user(&info, arg, sizeof(info)))
4183 rdev = find_rdev_nr(mddev, info.number);
4185 info.major = MAJOR(rdev->bdev->bd_dev);
4186 info.minor = MINOR(rdev->bdev->bd_dev);
4187 info.raid_disk = rdev->raid_disk;
4189 if (test_bit(Faulty, &rdev->flags))
4190 info.state |= (1<<MD_DISK_FAULTY);
4191 else if (test_bit(In_sync, &rdev->flags)) {
4192 info.state |= (1<<MD_DISK_ACTIVE);
4193 info.state |= (1<<MD_DISK_SYNC);
4195 if (test_bit(WriteMostly, &rdev->flags))
4196 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4198 info.major = info.minor = 0;
4199 info.raid_disk = -1;
4200 info.state = (1<<MD_DISK_REMOVED);
4203 if (copy_to_user(arg, &info, sizeof(info)))
4209 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4211 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4213 dev_t dev = MKDEV(info->major,info->minor);
4215 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4218 if (!mddev->raid_disks) {
4220 /* expecting a device which has a superblock */
4221 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4224 "md: md_import_device returned %ld\n",
4226 return PTR_ERR(rdev);
4228 if (!list_empty(&mddev->disks)) {
4229 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4230 mdk_rdev_t, same_set);
4231 int err = super_types[mddev->major_version]
4232 .load_super(rdev, rdev0, mddev->minor_version);
4235 "md: %s has different UUID to %s\n",
4236 bdevname(rdev->bdev,b),
4237 bdevname(rdev0->bdev,b2));
4242 err = bind_rdev_to_array(rdev, mddev);
4249 * add_new_disk can be used once the array is assembled
4250 * to add "hot spares". They must already have a superblock
4255 if (!mddev->pers->hot_add_disk) {
4257 "%s: personality does not support diskops!\n",
4261 if (mddev->persistent)
4262 rdev = md_import_device(dev, mddev->major_version,
4263 mddev->minor_version);
4265 rdev = md_import_device(dev, -1, -1);
4268 "md: md_import_device returned %ld\n",
4270 return PTR_ERR(rdev);
4272 /* set save_raid_disk if appropriate */
4273 if (!mddev->persistent) {
4274 if (info->state & (1<<MD_DISK_SYNC) &&
4275 info->raid_disk < mddev->raid_disks)
4276 rdev->raid_disk = info->raid_disk;
4278 rdev->raid_disk = -1;
4280 super_types[mddev->major_version].
4281 validate_super(mddev, rdev);
4282 rdev->saved_raid_disk = rdev->raid_disk;
4284 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4285 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4286 set_bit(WriteMostly, &rdev->flags);
4288 rdev->raid_disk = -1;
4289 err = bind_rdev_to_array(rdev, mddev);
4290 if (!err && !mddev->pers->hot_remove_disk) {
4291 /* If there is hot_add_disk but no hot_remove_disk
4292 * then added disks for geometry changes,
4293 * and should be added immediately.
4295 super_types[mddev->major_version].
4296 validate_super(mddev, rdev);
4297 err = mddev->pers->hot_add_disk(mddev, rdev);
4299 unbind_rdev_from_array(rdev);
4304 sysfs_notify_dirent(rdev->sysfs_state);
4306 md_update_sb(mddev, 1);
4307 if (mddev->degraded)
4308 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4309 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4310 md_wakeup_thread(mddev->thread);
4314 /* otherwise, add_new_disk is only allowed
4315 * for major_version==0 superblocks
4317 if (mddev->major_version != 0) {
4318 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4323 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4325 rdev = md_import_device(dev, -1, 0);
4328 "md: error, md_import_device() returned %ld\n",
4330 return PTR_ERR(rdev);
4332 rdev->desc_nr = info->number;
4333 if (info->raid_disk < mddev->raid_disks)
4334 rdev->raid_disk = info->raid_disk;
4336 rdev->raid_disk = -1;
4338 if (rdev->raid_disk < mddev->raid_disks)
4339 if (info->state & (1<<MD_DISK_SYNC))
4340 set_bit(In_sync, &rdev->flags);
4342 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4343 set_bit(WriteMostly, &rdev->flags);
4345 if (!mddev->persistent) {
4346 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4347 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4349 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4350 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4352 err = bind_rdev_to_array(rdev, mddev);
4362 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4364 char b[BDEVNAME_SIZE];
4367 rdev = find_rdev(mddev, dev);
4371 if (rdev->raid_disk >= 0)
4374 kick_rdev_from_array(rdev);
4375 md_update_sb(mddev, 1);
4376 md_new_event(mddev);
4380 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4381 bdevname(rdev->bdev,b), mdname(mddev));
4385 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4387 char b[BDEVNAME_SIZE];
4394 if (mddev->major_version != 0) {
4395 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4396 " version-0 superblocks.\n",
4400 if (!mddev->pers->hot_add_disk) {
4402 "%s: personality does not support diskops!\n",
4407 rdev = md_import_device(dev, -1, 0);
4410 "md: error, md_import_device() returned %ld\n",
4415 if (mddev->persistent)
4416 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4418 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4420 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4422 if (test_bit(Faulty, &rdev->flags)) {
4424 "md: can not hot-add faulty %s disk to %s!\n",
4425 bdevname(rdev->bdev,b), mdname(mddev));
4429 clear_bit(In_sync, &rdev->flags);
4431 rdev->saved_raid_disk = -1;
4432 err = bind_rdev_to_array(rdev, mddev);
4437 * The rest should better be atomic, we can have disk failures
4438 * noticed in interrupt contexts ...
4441 if (rdev->desc_nr == mddev->max_disks) {
4442 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4445 goto abort_unbind_export;
4448 rdev->raid_disk = -1;
4450 md_update_sb(mddev, 1);
4453 * Kick recovery, maybe this spare has to be added to the
4454 * array immediately.
4456 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4457 md_wakeup_thread(mddev->thread);
4458 md_new_event(mddev);
4461 abort_unbind_export:
4462 unbind_rdev_from_array(rdev);
4469 static int set_bitmap_file(mddev_t *mddev, int fd)
4474 if (!mddev->pers->quiesce)
4476 if (mddev->recovery || mddev->sync_thread)
4478 /* we should be able to change the bitmap.. */
4484 return -EEXIST; /* cannot add when bitmap is present */
4485 mddev->bitmap_file = fget(fd);
4487 if (mddev->bitmap_file == NULL) {
4488 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4493 err = deny_bitmap_write_access(mddev->bitmap_file);
4495 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4497 fput(mddev->bitmap_file);
4498 mddev->bitmap_file = NULL;
4501 mddev->bitmap_offset = 0; /* file overrides offset */
4502 } else if (mddev->bitmap == NULL)
4503 return -ENOENT; /* cannot remove what isn't there */
4506 mddev->pers->quiesce(mddev, 1);
4508 err = bitmap_create(mddev);
4509 if (fd < 0 || err) {
4510 bitmap_destroy(mddev);
4511 fd = -1; /* make sure to put the file */
4513 mddev->pers->quiesce(mddev, 0);
4516 if (mddev->bitmap_file) {
4517 restore_bitmap_write_access(mddev->bitmap_file);
4518 fput(mddev->bitmap_file);
4520 mddev->bitmap_file = NULL;
4527 * set_array_info is used two different ways
4528 * The original usage is when creating a new array.
4529 * In this usage, raid_disks is > 0 and it together with
4530 * level, size, not_persistent,layout,chunksize determine the
4531 * shape of the array.
4532 * This will always create an array with a type-0.90.0 superblock.
4533 * The newer usage is when assembling an array.
4534 * In this case raid_disks will be 0, and the major_version field is
4535 * use to determine which style super-blocks are to be found on the devices.
4536 * The minor and patch _version numbers are also kept incase the
4537 * super_block handler wishes to interpret them.
4539 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4542 if (info->raid_disks == 0) {
4543 /* just setting version number for superblock loading */
4544 if (info->major_version < 0 ||
4545 info->major_version >= ARRAY_SIZE(super_types) ||
4546 super_types[info->major_version].name == NULL) {
4547 /* maybe try to auto-load a module? */
4549 "md: superblock version %d not known\n",
4550 info->major_version);
4553 mddev->major_version = info->major_version;
4554 mddev->minor_version = info->minor_version;
4555 mddev->patch_version = info->patch_version;
4556 mddev->persistent = !info->not_persistent;
4559 mddev->major_version = MD_MAJOR_VERSION;
4560 mddev->minor_version = MD_MINOR_VERSION;
4561 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4562 mddev->ctime = get_seconds();
4564 mddev->level = info->level;
4565 mddev->clevel[0] = 0;
4566 mddev->size = info->size;
4567 mddev->raid_disks = info->raid_disks;
4568 /* don't set md_minor, it is determined by which /dev/md* was
4571 if (info->state & (1<<MD_SB_CLEAN))
4572 mddev->recovery_cp = MaxSector;
4574 mddev->recovery_cp = 0;
4575 mddev->persistent = ! info->not_persistent;
4576 mddev->external = 0;
4578 mddev->layout = info->layout;
4579 mddev->chunk_size = info->chunk_size;
4581 mddev->max_disks = MD_SB_DISKS;
4583 if (mddev->persistent)
4585 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4587 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4588 mddev->bitmap_offset = 0;
4590 mddev->reshape_position = MaxSector;
4593 * Generate a 128 bit UUID
4595 get_random_bytes(mddev->uuid, 16);
4597 mddev->new_level = mddev->level;
4598 mddev->new_chunk = mddev->chunk_size;
4599 mddev->new_layout = mddev->layout;
4600 mddev->delta_disks = 0;
4605 static int update_size(mddev_t *mddev, sector_t num_sectors)
4609 int fit = (num_sectors == 0);
4611 if (mddev->pers->resize == NULL)
4613 /* The "num_sectors" is the number of sectors of each device that
4614 * is used. This can only make sense for arrays with redundancy.
4615 * linear and raid0 always use whatever space is available. We can only
4616 * consider changing this number if no resync or reconstruction is
4617 * happening, and if the new size is acceptable. It must fit before the
4618 * sb_start or, if that is <data_offset, it must fit before the size
4619 * of each device. If num_sectors is zero, we find the largest size
4623 if (mddev->sync_thread)
4626 /* Sorry, cannot grow a bitmap yet, just remove it,
4630 list_for_each_entry(rdev, &mddev->disks, same_set) {
4632 avail = rdev->size * 2;
4634 if (fit && (num_sectors == 0 || num_sectors > avail))
4635 num_sectors = avail;
4636 if (avail < num_sectors)
4639 rv = mddev->pers->resize(mddev, num_sectors);
4641 struct block_device *bdev;
4643 bdev = bdget_disk(mddev->gendisk, 0);
4645 mutex_lock(&bdev->bd_inode->i_mutex);
4646 i_size_write(bdev->bd_inode,
4647 (loff_t)mddev->array_sectors << 9);
4648 mutex_unlock(&bdev->bd_inode->i_mutex);
4655 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4658 /* change the number of raid disks */
4659 if (mddev->pers->check_reshape == NULL)
4661 if (raid_disks <= 0 ||
4662 raid_disks >= mddev->max_disks)
4664 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4666 mddev->delta_disks = raid_disks - mddev->raid_disks;
4668 rv = mddev->pers->check_reshape(mddev);
4674 * update_array_info is used to change the configuration of an
4676 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4677 * fields in the info are checked against the array.
4678 * Any differences that cannot be handled will cause an error.
4679 * Normally, only one change can be managed at a time.
4681 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4687 /* calculate expected state,ignoring low bits */
4688 if (mddev->bitmap && mddev->bitmap_offset)
4689 state |= (1 << MD_SB_BITMAP_PRESENT);
4691 if (mddev->major_version != info->major_version ||
4692 mddev->minor_version != info->minor_version ||
4693 /* mddev->patch_version != info->patch_version || */
4694 mddev->ctime != info->ctime ||
4695 mddev->level != info->level ||
4696 /* mddev->layout != info->layout || */
4697 !mddev->persistent != info->not_persistent||
4698 mddev->chunk_size != info->chunk_size ||
4699 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4700 ((state^info->state) & 0xfffffe00)
4703 /* Check there is only one change */
4704 if (info->size >= 0 && mddev->size != info->size) cnt++;
4705 if (mddev->raid_disks != info->raid_disks) cnt++;
4706 if (mddev->layout != info->layout) cnt++;
4707 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4708 if (cnt == 0) return 0;
4709 if (cnt > 1) return -EINVAL;
4711 if (mddev->layout != info->layout) {
4713 * we don't need to do anything at the md level, the
4714 * personality will take care of it all.
4716 if (mddev->pers->reconfig == NULL)
4719 return mddev->pers->reconfig(mddev, info->layout, -1);
4721 if (info->size >= 0 && mddev->size != info->size)
4722 rv = update_size(mddev, (sector_t)info->size * 2);
4724 if (mddev->raid_disks != info->raid_disks)
4725 rv = update_raid_disks(mddev, info->raid_disks);
4727 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4728 if (mddev->pers->quiesce == NULL)
4730 if (mddev->recovery || mddev->sync_thread)
4732 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4733 /* add the bitmap */
4736 if (mddev->default_bitmap_offset == 0)
4738 mddev->bitmap_offset = mddev->default_bitmap_offset;
4739 mddev->pers->quiesce(mddev, 1);
4740 rv = bitmap_create(mddev);
4742 bitmap_destroy(mddev);
4743 mddev->pers->quiesce(mddev, 0);
4745 /* remove the bitmap */
4748 if (mddev->bitmap->file)
4750 mddev->pers->quiesce(mddev, 1);
4751 bitmap_destroy(mddev);
4752 mddev->pers->quiesce(mddev, 0);
4753 mddev->bitmap_offset = 0;
4756 md_update_sb(mddev, 1);
4760 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4764 if (mddev->pers == NULL)
4767 rdev = find_rdev(mddev, dev);
4771 md_error(mddev, rdev);
4776 * We have a problem here : there is no easy way to give a CHS
4777 * virtual geometry. We currently pretend that we have a 2 heads
4778 * 4 sectors (with a BIG number of cylinders...). This drives
4779 * dosfs just mad... ;-)
4781 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4783 mddev_t *mddev = bdev->bd_disk->private_data;
4787 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4791 static int md_ioctl(struct block_device *bdev, fmode_t mode,
4792 unsigned int cmd, unsigned long arg)
4795 void __user *argp = (void __user *)arg;
4796 mddev_t *mddev = NULL;
4798 if (!capable(CAP_SYS_ADMIN))
4802 * Commands dealing with the RAID driver but not any
4808 err = get_version(argp);
4811 case PRINT_RAID_DEBUG:
4819 autostart_arrays(arg);
4826 * Commands creating/starting a new array:
4829 mddev = bdev->bd_disk->private_data;
4836 err = mddev_lock(mddev);
4839 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4846 case SET_ARRAY_INFO:
4848 mdu_array_info_t info;
4850 memset(&info, 0, sizeof(info));
4851 else if (copy_from_user(&info, argp, sizeof(info))) {
4856 err = update_array_info(mddev, &info);
4858 printk(KERN_WARNING "md: couldn't update"
4859 " array info. %d\n", err);
4864 if (!list_empty(&mddev->disks)) {
4866 "md: array %s already has disks!\n",
4871 if (mddev->raid_disks) {
4873 "md: array %s already initialised!\n",
4878 err = set_array_info(mddev, &info);
4880 printk(KERN_WARNING "md: couldn't set"
4881 " array info. %d\n", err);
4891 * Commands querying/configuring an existing array:
4893 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4894 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4895 if ((!mddev->raid_disks && !mddev->external)
4896 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4897 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4898 && cmd != GET_BITMAP_FILE) {
4904 * Commands even a read-only array can execute:
4908 case GET_ARRAY_INFO:
4909 err = get_array_info(mddev, argp);
4912 case GET_BITMAP_FILE:
4913 err = get_bitmap_file(mddev, argp);
4917 err = get_disk_info(mddev, argp);
4920 case RESTART_ARRAY_RW:
4921 err = restart_array(mddev);
4925 err = do_md_stop(mddev, 0, 1);
4929 err = do_md_stop(mddev, 1, 1);
4935 * The remaining ioctls are changing the state of the
4936 * superblock, so we do not allow them on read-only arrays.
4937 * However non-MD ioctls (e.g. get-size) will still come through
4938 * here and hit the 'default' below, so only disallow
4939 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4941 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
4942 if (mddev->ro == 2) {
4944 sysfs_notify_dirent(mddev->sysfs_state);
4945 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4946 md_wakeup_thread(mddev->thread);
4957 mdu_disk_info_t info;
4958 if (copy_from_user(&info, argp, sizeof(info)))
4961 err = add_new_disk(mddev, &info);
4965 case HOT_REMOVE_DISK:
4966 err = hot_remove_disk(mddev, new_decode_dev(arg));
4970 err = hot_add_disk(mddev, new_decode_dev(arg));
4973 case SET_DISK_FAULTY:
4974 err = set_disk_faulty(mddev, new_decode_dev(arg));
4978 err = do_md_run(mddev);
4981 case SET_BITMAP_FILE:
4982 err = set_bitmap_file(mddev, (int)arg);
4992 mddev_unlock(mddev);
5002 static int md_open(struct block_device *bdev, fmode_t mode)
5005 * Succeed if we can lock the mddev, which confirms that
5006 * it isn't being stopped right now.
5008 mddev_t *mddev = bdev->bd_disk->private_data;
5011 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5016 atomic_inc(&mddev->openers);
5017 mddev_unlock(mddev);
5019 check_disk_change(bdev);
5024 static int md_release(struct gendisk *disk, fmode_t mode)
5026 mddev_t *mddev = disk->private_data;
5029 atomic_dec(&mddev->openers);
5035 static int md_media_changed(struct gendisk *disk)
5037 mddev_t *mddev = disk->private_data;
5039 return mddev->changed;
5042 static int md_revalidate(struct gendisk *disk)
5044 mddev_t *mddev = disk->private_data;
5049 static struct block_device_operations md_fops =
5051 .owner = THIS_MODULE,
5053 .release = md_release,
5054 .locked_ioctl = md_ioctl,
5055 .getgeo = md_getgeo,
5056 .media_changed = md_media_changed,
5057 .revalidate_disk= md_revalidate,
5060 static int md_thread(void * arg)
5062 mdk_thread_t *thread = arg;
5065 * md_thread is a 'system-thread', it's priority should be very
5066 * high. We avoid resource deadlocks individually in each
5067 * raid personality. (RAID5 does preallocation) We also use RR and
5068 * the very same RT priority as kswapd, thus we will never get
5069 * into a priority inversion deadlock.
5071 * we definitely have to have equal or higher priority than
5072 * bdflush, otherwise bdflush will deadlock if there are too
5073 * many dirty RAID5 blocks.
5076 allow_signal(SIGKILL);
5077 while (!kthread_should_stop()) {
5079 /* We need to wait INTERRUPTIBLE so that
5080 * we don't add to the load-average.
5081 * That means we need to be sure no signals are
5084 if (signal_pending(current))
5085 flush_signals(current);
5087 wait_event_interruptible_timeout
5089 test_bit(THREAD_WAKEUP, &thread->flags)
5090 || kthread_should_stop(),
5093 clear_bit(THREAD_WAKEUP, &thread->flags);
5095 thread->run(thread->mddev);
5101 void md_wakeup_thread(mdk_thread_t *thread)
5104 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5105 set_bit(THREAD_WAKEUP, &thread->flags);
5106 wake_up(&thread->wqueue);
5110 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5113 mdk_thread_t *thread;
5115 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5119 init_waitqueue_head(&thread->wqueue);
5122 thread->mddev = mddev;
5123 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5124 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5125 if (IS_ERR(thread->tsk)) {
5132 void md_unregister_thread(mdk_thread_t *thread)
5134 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5136 kthread_stop(thread->tsk);
5140 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5147 if (!rdev || test_bit(Faulty, &rdev->flags))
5150 if (mddev->external)
5151 set_bit(Blocked, &rdev->flags);
5153 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5155 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5156 __builtin_return_address(0),__builtin_return_address(1),
5157 __builtin_return_address(2),__builtin_return_address(3));
5161 if (!mddev->pers->error_handler)
5163 mddev->pers->error_handler(mddev,rdev);
5164 if (mddev->degraded)
5165 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5166 set_bit(StateChanged, &rdev->flags);
5167 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5168 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5169 md_wakeup_thread(mddev->thread);
5170 md_new_event_inintr(mddev);
5173 /* seq_file implementation /proc/mdstat */
5175 static void status_unused(struct seq_file *seq)
5180 seq_printf(seq, "unused devices: ");
5182 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5183 char b[BDEVNAME_SIZE];
5185 seq_printf(seq, "%s ",
5186 bdevname(rdev->bdev,b));
5189 seq_printf(seq, "<none>");
5191 seq_printf(seq, "\n");
5195 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5197 sector_t max_blocks, resync, res;
5198 unsigned long dt, db, rt;
5200 unsigned int per_milli;
5202 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5204 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5205 max_blocks = mddev->resync_max_sectors >> 1;
5207 max_blocks = mddev->size;
5210 * Should not happen.
5216 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5217 * in a sector_t, and (max_blocks>>scale) will fit in a
5218 * u32, as those are the requirements for sector_div.
5219 * Thus 'scale' must be at least 10
5222 if (sizeof(sector_t) > sizeof(unsigned long)) {
5223 while ( max_blocks/2 > (1ULL<<(scale+32)))
5226 res = (resync>>scale)*1000;
5227 sector_div(res, (u32)((max_blocks>>scale)+1));
5231 int i, x = per_milli/50, y = 20-x;
5232 seq_printf(seq, "[");
5233 for (i = 0; i < x; i++)
5234 seq_printf(seq, "=");
5235 seq_printf(seq, ">");
5236 for (i = 0; i < y; i++)
5237 seq_printf(seq, ".");
5238 seq_printf(seq, "] ");
5240 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5241 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5243 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5245 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5246 "resync" : "recovery"))),
5247 per_milli/10, per_milli % 10,
5248 (unsigned long long) resync,
5249 (unsigned long long) max_blocks);
5252 * We do not want to overflow, so the order of operands and
5253 * the * 100 / 100 trick are important. We do a +1 to be
5254 * safe against division by zero. We only estimate anyway.
5256 * dt: time from mark until now
5257 * db: blocks written from mark until now
5258 * rt: remaining time
5260 dt = ((jiffies - mddev->resync_mark) / HZ);
5262 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5263 - mddev->resync_mark_cnt;
5264 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5266 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5268 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5271 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5273 struct list_head *tmp;
5283 spin_lock(&all_mddevs_lock);
5284 list_for_each(tmp,&all_mddevs)
5286 mddev = list_entry(tmp, mddev_t, all_mddevs);
5288 spin_unlock(&all_mddevs_lock);
5291 spin_unlock(&all_mddevs_lock);
5293 return (void*)2;/* tail */
5297 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5299 struct list_head *tmp;
5300 mddev_t *next_mddev, *mddev = v;
5306 spin_lock(&all_mddevs_lock);
5308 tmp = all_mddevs.next;
5310 tmp = mddev->all_mddevs.next;
5311 if (tmp != &all_mddevs)
5312 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5314 next_mddev = (void*)2;
5317 spin_unlock(&all_mddevs_lock);
5325 static void md_seq_stop(struct seq_file *seq, void *v)
5329 if (mddev && v != (void*)1 && v != (void*)2)
5333 struct mdstat_info {
5337 static int md_seq_show(struct seq_file *seq, void *v)
5342 struct mdstat_info *mi = seq->private;
5343 struct bitmap *bitmap;
5345 if (v == (void*)1) {
5346 struct mdk_personality *pers;
5347 seq_printf(seq, "Personalities : ");
5348 spin_lock(&pers_lock);
5349 list_for_each_entry(pers, &pers_list, list)
5350 seq_printf(seq, "[%s] ", pers->name);
5352 spin_unlock(&pers_lock);
5353 seq_printf(seq, "\n");
5354 mi->event = atomic_read(&md_event_count);
5357 if (v == (void*)2) {
5362 if (mddev_lock(mddev) < 0)
5365 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5366 seq_printf(seq, "%s : %sactive", mdname(mddev),
5367 mddev->pers ? "" : "in");
5370 seq_printf(seq, " (read-only)");
5372 seq_printf(seq, " (auto-read-only)");
5373 seq_printf(seq, " %s", mddev->pers->name);
5377 list_for_each_entry(rdev, &mddev->disks, same_set) {
5378 char b[BDEVNAME_SIZE];
5379 seq_printf(seq, " %s[%d]",
5380 bdevname(rdev->bdev,b), rdev->desc_nr);
5381 if (test_bit(WriteMostly, &rdev->flags))
5382 seq_printf(seq, "(W)");
5383 if (test_bit(Faulty, &rdev->flags)) {
5384 seq_printf(seq, "(F)");
5386 } else if (rdev->raid_disk < 0)
5387 seq_printf(seq, "(S)"); /* spare */
5391 if (!list_empty(&mddev->disks)) {
5393 seq_printf(seq, "\n %llu blocks",
5394 (unsigned long long)
5395 mddev->array_sectors / 2);
5397 seq_printf(seq, "\n %llu blocks",
5398 (unsigned long long)size);
5400 if (mddev->persistent) {
5401 if (mddev->major_version != 0 ||
5402 mddev->minor_version != 90) {
5403 seq_printf(seq," super %d.%d",
5404 mddev->major_version,
5405 mddev->minor_version);
5407 } else if (mddev->external)
5408 seq_printf(seq, " super external:%s",
5409 mddev->metadata_type);
5411 seq_printf(seq, " super non-persistent");
5414 mddev->pers->status(seq, mddev);
5415 seq_printf(seq, "\n ");
5416 if (mddev->pers->sync_request) {
5417 if (mddev->curr_resync > 2) {
5418 status_resync(seq, mddev);
5419 seq_printf(seq, "\n ");
5420 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5421 seq_printf(seq, "\tresync=DELAYED\n ");
5422 else if (mddev->recovery_cp < MaxSector)
5423 seq_printf(seq, "\tresync=PENDING\n ");
5426 seq_printf(seq, "\n ");
5428 if ((bitmap = mddev->bitmap)) {
5429 unsigned long chunk_kb;
5430 unsigned long flags;
5431 spin_lock_irqsave(&bitmap->lock, flags);
5432 chunk_kb = bitmap->chunksize >> 10;
5433 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5435 bitmap->pages - bitmap->missing_pages,
5437 (bitmap->pages - bitmap->missing_pages)
5438 << (PAGE_SHIFT - 10),
5439 chunk_kb ? chunk_kb : bitmap->chunksize,
5440 chunk_kb ? "KB" : "B");
5442 seq_printf(seq, ", file: ");
5443 seq_path(seq, &bitmap->file->f_path, " \t\n");
5446 seq_printf(seq, "\n");
5447 spin_unlock_irqrestore(&bitmap->lock, flags);
5450 seq_printf(seq, "\n");
5452 mddev_unlock(mddev);
5457 static struct seq_operations md_seq_ops = {
5458 .start = md_seq_start,
5459 .next = md_seq_next,
5460 .stop = md_seq_stop,
5461 .show = md_seq_show,
5464 static int md_seq_open(struct inode *inode, struct file *file)
5467 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5471 error = seq_open(file, &md_seq_ops);
5475 struct seq_file *p = file->private_data;
5477 mi->event = atomic_read(&md_event_count);
5482 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5484 struct seq_file *m = filp->private_data;
5485 struct mdstat_info *mi = m->private;
5488 poll_wait(filp, &md_event_waiters, wait);
5490 /* always allow read */
5491 mask = POLLIN | POLLRDNORM;
5493 if (mi->event != atomic_read(&md_event_count))
5494 mask |= POLLERR | POLLPRI;
5498 static const struct file_operations md_seq_fops = {
5499 .owner = THIS_MODULE,
5500 .open = md_seq_open,
5502 .llseek = seq_lseek,
5503 .release = seq_release_private,
5504 .poll = mdstat_poll,
5507 int register_md_personality(struct mdk_personality *p)
5509 spin_lock(&pers_lock);
5510 list_add_tail(&p->list, &pers_list);
5511 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5512 spin_unlock(&pers_lock);
5516 int unregister_md_personality(struct mdk_personality *p)
5518 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5519 spin_lock(&pers_lock);
5520 list_del_init(&p->list);
5521 spin_unlock(&pers_lock);
5525 static int is_mddev_idle(mddev_t *mddev)
5533 rdev_for_each_rcu(rdev, mddev) {
5534 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5535 curr_events = part_stat_read(&disk->part0, sectors[0]) +
5536 part_stat_read(&disk->part0, sectors[1]) -
5537 atomic_read(&disk->sync_io);
5538 /* sync IO will cause sync_io to increase before the disk_stats
5539 * as sync_io is counted when a request starts, and
5540 * disk_stats is counted when it completes.
5541 * So resync activity will cause curr_events to be smaller than
5542 * when there was no such activity.
5543 * non-sync IO will cause disk_stat to increase without
5544 * increasing sync_io so curr_events will (eventually)
5545 * be larger than it was before. Once it becomes
5546 * substantially larger, the test below will cause
5547 * the array to appear non-idle, and resync will slow
5549 * If there is a lot of outstanding resync activity when
5550 * we set last_event to curr_events, then all that activity
5551 * completing might cause the array to appear non-idle
5552 * and resync will be slowed down even though there might
5553 * not have been non-resync activity. This will only
5554 * happen once though. 'last_events' will soon reflect
5555 * the state where there is little or no outstanding
5556 * resync requests, and further resync activity will
5557 * always make curr_events less than last_events.
5560 if (curr_events - rdev->last_events > 4096) {
5561 rdev->last_events = curr_events;
5569 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5571 /* another "blocks" (512byte) blocks have been synced */
5572 atomic_sub(blocks, &mddev->recovery_active);
5573 wake_up(&mddev->recovery_wait);
5575 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5576 md_wakeup_thread(mddev->thread);
5577 // stop recovery, signal do_sync ....
5582 /* md_write_start(mddev, bi)
5583 * If we need to update some array metadata (e.g. 'active' flag
5584 * in superblock) before writing, schedule a superblock update
5585 * and wait for it to complete.
5587 void md_write_start(mddev_t *mddev, struct bio *bi)
5590 if (bio_data_dir(bi) != WRITE)
5593 BUG_ON(mddev->ro == 1);
5594 if (mddev->ro == 2) {
5595 /* need to switch to read/write */
5597 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5598 md_wakeup_thread(mddev->thread);
5599 md_wakeup_thread(mddev->sync_thread);
5602 atomic_inc(&mddev->writes_pending);
5603 if (mddev->safemode == 1)
5604 mddev->safemode = 0;
5605 if (mddev->in_sync) {
5606 spin_lock_irq(&mddev->write_lock);
5607 if (mddev->in_sync) {
5609 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5610 md_wakeup_thread(mddev->thread);
5613 spin_unlock_irq(&mddev->write_lock);
5616 sysfs_notify_dirent(mddev->sysfs_state);
5617 wait_event(mddev->sb_wait,
5618 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5619 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5622 void md_write_end(mddev_t *mddev)
5624 if (atomic_dec_and_test(&mddev->writes_pending)) {
5625 if (mddev->safemode == 2)
5626 md_wakeup_thread(mddev->thread);
5627 else if (mddev->safemode_delay)
5628 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5632 /* md_allow_write(mddev)
5633 * Calling this ensures that the array is marked 'active' so that writes
5634 * may proceed without blocking. It is important to call this before
5635 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5636 * Must be called with mddev_lock held.
5638 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5639 * is dropped, so return -EAGAIN after notifying userspace.
5641 int md_allow_write(mddev_t *mddev)
5647 if (!mddev->pers->sync_request)
5650 spin_lock_irq(&mddev->write_lock);
5651 if (mddev->in_sync) {
5653 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5654 if (mddev->safemode_delay &&
5655 mddev->safemode == 0)
5656 mddev->safemode = 1;
5657 spin_unlock_irq(&mddev->write_lock);
5658 md_update_sb(mddev, 0);
5659 sysfs_notify_dirent(mddev->sysfs_state);
5661 spin_unlock_irq(&mddev->write_lock);
5663 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
5668 EXPORT_SYMBOL_GPL(md_allow_write);
5670 #define SYNC_MARKS 10
5671 #define SYNC_MARK_STEP (3*HZ)
5672 void md_do_sync(mddev_t *mddev)
5675 unsigned int currspeed = 0,
5677 sector_t max_sectors,j, io_sectors;
5678 unsigned long mark[SYNC_MARKS];
5679 sector_t mark_cnt[SYNC_MARKS];
5681 struct list_head *tmp;
5682 sector_t last_check;
5687 /* just incase thread restarts... */
5688 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5690 if (mddev->ro) /* never try to sync a read-only array */
5693 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5694 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5695 desc = "data-check";
5696 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5697 desc = "requested-resync";
5700 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5705 /* we overload curr_resync somewhat here.
5706 * 0 == not engaged in resync at all
5707 * 2 == checking that there is no conflict with another sync
5708 * 1 == like 2, but have yielded to allow conflicting resync to
5710 * other == active in resync - this many blocks
5712 * Before starting a resync we must have set curr_resync to
5713 * 2, and then checked that every "conflicting" array has curr_resync
5714 * less than ours. When we find one that is the same or higher
5715 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5716 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5717 * This will mean we have to start checking from the beginning again.
5722 mddev->curr_resync = 2;
5725 if (kthread_should_stop()) {
5726 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5729 for_each_mddev(mddev2, tmp) {
5730 if (mddev2 == mddev)
5732 if (!mddev->parallel_resync
5733 && mddev2->curr_resync
5734 && match_mddev_units(mddev, mddev2)) {
5736 if (mddev < mddev2 && mddev->curr_resync == 2) {
5737 /* arbitrarily yield */
5738 mddev->curr_resync = 1;
5739 wake_up(&resync_wait);
5741 if (mddev > mddev2 && mddev->curr_resync == 1)
5742 /* no need to wait here, we can wait the next
5743 * time 'round when curr_resync == 2
5746 /* We need to wait 'interruptible' so as not to
5747 * contribute to the load average, and not to
5748 * be caught by 'softlockup'
5750 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
5751 if (!kthread_should_stop() &&
5752 mddev2->curr_resync >= mddev->curr_resync) {
5753 printk(KERN_INFO "md: delaying %s of %s"
5754 " until %s has finished (they"
5755 " share one or more physical units)\n",
5756 desc, mdname(mddev), mdname(mddev2));
5758 if (signal_pending(current))
5759 flush_signals(current);
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 list_for_each_entry(rdev, &mddev->disks, same_set)
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 list_for_each_entry(rdev, &mddev->disks, same_set)
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)
5976 list_for_each_entry(rdev, &mddev->disks, same_set)
5977 if (rdev->raid_disk >= 0 &&
5978 !test_bit(Blocked, &rdev->flags) &&
5979 (test_bit(Faulty, &rdev->flags) ||
5980 ! test_bit(In_sync, &rdev->flags)) &&
5981 atomic_read(&rdev->nr_pending)==0) {
5982 if (mddev->pers->hot_remove_disk(
5983 mddev, rdev->raid_disk)==0) {
5985 sprintf(nm,"rd%d", rdev->raid_disk);
5986 sysfs_remove_link(&mddev->kobj, nm);
5987 rdev->raid_disk = -1;
5991 if (mddev->degraded && ! mddev->ro) {
5992 list_for_each_entry(rdev, &mddev->disks, same_set) {
5993 if (rdev->raid_disk >= 0 &&
5994 !test_bit(In_sync, &rdev->flags) &&
5995 !test_bit(Blocked, &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)
6047 bitmap_daemon_work(mddev->bitmap);
6052 if (signal_pending(current)) {
6053 if (mddev->pers->sync_request && !mddev->external) {
6054 printk(KERN_INFO "md: %s in immediate safe mode\n",
6056 mddev->safemode = 2;
6058 flush_signals(current);
6061 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6064 (mddev->flags && !mddev->external) ||
6065 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6066 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6067 (mddev->external == 0 && mddev->safemode == 1) ||
6068 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6069 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6073 if (mddev_trylock(mddev)) {
6077 /* Only thing we do on a ro array is remove
6080 remove_and_add_spares(mddev);
6081 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6085 if (!mddev->external) {
6087 spin_lock_irq(&mddev->write_lock);
6088 if (mddev->safemode &&
6089 !atomic_read(&mddev->writes_pending) &&
6091 mddev->recovery_cp == MaxSector) {
6094 if (mddev->persistent)
6095 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6097 if (mddev->safemode == 1)
6098 mddev->safemode = 0;
6099 spin_unlock_irq(&mddev->write_lock);
6101 sysfs_notify_dirent(mddev->sysfs_state);
6105 md_update_sb(mddev, 0);
6107 list_for_each_entry(rdev, &mddev->disks, same_set)
6108 if (test_and_clear_bit(StateChanged, &rdev->flags))
6109 sysfs_notify_dirent(rdev->sysfs_state);
6112 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6113 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6114 /* resync/recovery still happening */
6115 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6118 if (mddev->sync_thread) {
6119 /* resync has finished, collect result */
6120 md_unregister_thread(mddev->sync_thread);
6121 mddev->sync_thread = NULL;
6122 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6123 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6125 /* activate any spares */
6126 if (mddev->pers->spare_active(mddev))
6127 sysfs_notify(&mddev->kobj, NULL,
6130 md_update_sb(mddev, 1);
6132 /* if array is no-longer degraded, then any saved_raid_disk
6133 * information must be scrapped
6135 if (!mddev->degraded)
6136 list_for_each_entry(rdev, &mddev->disks, same_set)
6137 rdev->saved_raid_disk = -1;
6139 mddev->recovery = 0;
6140 /* flag recovery needed just to double check */
6141 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6142 sysfs_notify_dirent(mddev->sysfs_action);
6143 md_new_event(mddev);
6146 /* Set RUNNING before clearing NEEDED to avoid
6147 * any transients in the value of "sync_action".
6149 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6150 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6151 /* Clear some bits that don't mean anything, but
6154 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6155 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6157 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6159 /* no recovery is running.
6160 * remove any failed drives, then
6161 * add spares if possible.
6162 * Spare are also removed and re-added, to allow
6163 * the personality to fail the re-add.
6166 if (mddev->reshape_position != MaxSector) {
6167 if (mddev->pers->check_reshape(mddev) != 0)
6168 /* Cannot proceed */
6170 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6171 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6172 } else if ((spares = remove_and_add_spares(mddev))) {
6173 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6174 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6175 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6176 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6177 } else if (mddev->recovery_cp < MaxSector) {
6178 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6179 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6180 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6181 /* nothing to be done ... */
6184 if (mddev->pers->sync_request) {
6185 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6186 /* We are adding a device or devices to an array
6187 * which has the bitmap stored on all devices.
6188 * So make sure all bitmap pages get written
6190 bitmap_write_all(mddev->bitmap);
6192 mddev->sync_thread = md_register_thread(md_do_sync,
6195 if (!mddev->sync_thread) {
6196 printk(KERN_ERR "%s: could not start resync"
6199 /* leave the spares where they are, it shouldn't hurt */
6200 mddev->recovery = 0;
6202 md_wakeup_thread(mddev->sync_thread);
6203 sysfs_notify_dirent(mddev->sysfs_action);
6204 md_new_event(mddev);
6207 if (!mddev->sync_thread) {
6208 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6209 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6211 if (mddev->sysfs_action)
6212 sysfs_notify_dirent(mddev->sysfs_action);
6214 mddev_unlock(mddev);
6218 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6220 sysfs_notify_dirent(rdev->sysfs_state);
6221 wait_event_timeout(rdev->blocked_wait,
6222 !test_bit(Blocked, &rdev->flags),
6223 msecs_to_jiffies(5000));
6224 rdev_dec_pending(rdev, mddev);
6226 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6228 static int md_notify_reboot(struct notifier_block *this,
6229 unsigned long code, void *x)
6231 struct list_head *tmp;
6234 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6236 printk(KERN_INFO "md: stopping all md devices.\n");
6238 for_each_mddev(mddev, tmp)
6239 if (mddev_trylock(mddev)) {
6240 /* Force a switch to readonly even array
6241 * appears to still be in use. Hence
6244 do_md_stop(mddev, 1, 100);
6245 mddev_unlock(mddev);
6248 * certain more exotic SCSI devices are known to be
6249 * volatile wrt too early system reboots. While the
6250 * right place to handle this issue is the given
6251 * driver, we do want to have a safe RAID driver ...
6258 static struct notifier_block md_notifier = {
6259 .notifier_call = md_notify_reboot,
6261 .priority = INT_MAX, /* before any real devices */
6264 static void md_geninit(void)
6266 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6268 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6271 static int __init md_init(void)
6273 if (register_blkdev(MAJOR_NR, "md"))
6275 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6276 unregister_blkdev(MAJOR_NR, "md");
6279 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6280 md_probe, NULL, NULL);
6281 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6282 md_probe, NULL, NULL);
6284 register_reboot_notifier(&md_notifier);
6285 raid_table_header = register_sysctl_table(raid_root_table);
6295 * Searches all registered partitions for autorun RAID arrays
6299 static LIST_HEAD(all_detected_devices);
6300 struct detected_devices_node {
6301 struct list_head list;
6305 void md_autodetect_dev(dev_t dev)
6307 struct detected_devices_node *node_detected_dev;
6309 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6310 if (node_detected_dev) {
6311 node_detected_dev->dev = dev;
6312 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6314 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6315 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6320 static void autostart_arrays(int part)
6323 struct detected_devices_node *node_detected_dev;
6325 int i_scanned, i_passed;
6330 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6332 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6334 node_detected_dev = list_entry(all_detected_devices.next,
6335 struct detected_devices_node, list);
6336 list_del(&node_detected_dev->list);
6337 dev = node_detected_dev->dev;
6338 kfree(node_detected_dev);
6339 rdev = md_import_device(dev,0, 90);
6343 if (test_bit(Faulty, &rdev->flags)) {
6347 set_bit(AutoDetected, &rdev->flags);
6348 list_add(&rdev->same_set, &pending_raid_disks);
6352 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6353 i_scanned, i_passed);
6355 autorun_devices(part);
6358 #endif /* !MODULE */
6360 static __exit void md_exit(void)
6363 struct list_head *tmp;
6365 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6366 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6368 unregister_blkdev(MAJOR_NR,"md");
6369 unregister_blkdev(mdp_major, "mdp");
6370 unregister_reboot_notifier(&md_notifier);
6371 unregister_sysctl_table(raid_table_header);
6372 remove_proc_entry("mdstat", NULL);
6373 for_each_mddev(mddev, tmp) {
6374 struct gendisk *disk = mddev->gendisk;
6377 export_array(mddev);
6380 mddev->gendisk = NULL;
6385 subsys_initcall(md_init);
6386 module_exit(md_exit)
6388 static int get_ro(char *buffer, struct kernel_param *kp)
6390 return sprintf(buffer, "%d", start_readonly);
6392 static int set_ro(const char *val, struct kernel_param *kp)
6395 int num = simple_strtoul(val, &e, 10);
6396 if (*val && (*e == '\0' || *e == '\n')) {
6397 start_readonly = num;
6403 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6404 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6407 EXPORT_SYMBOL(register_md_personality);
6408 EXPORT_SYMBOL(unregister_md_personality);
6409 EXPORT_SYMBOL(md_error);
6410 EXPORT_SYMBOL(md_done_sync);
6411 EXPORT_SYMBOL(md_write_start);
6412 EXPORT_SYMBOL(md_write_end);
6413 EXPORT_SYMBOL(md_register_thread);
6414 EXPORT_SYMBOL(md_unregister_thread);
6415 EXPORT_SYMBOL(md_wakeup_thread);
6416 EXPORT_SYMBOL(md_check_recovery);
6417 MODULE_LICENSE("GPL");
6419 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);