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)
311 struct list_head *tmp;
313 rdev_for_each(rdev, tmp, mddev) {
314 if (rdev->desc_nr == nr)
320 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
322 struct list_head *tmp;
325 rdev_for_each(rdev, tmp, mddev) {
326 if (rdev->bdev->bd_dev == dev)
332 static struct mdk_personality *find_pers(int level, char *clevel)
334 struct mdk_personality *pers;
335 list_for_each_entry(pers, &pers_list, list) {
336 if (level != LEVEL_NONE && pers->level == level)
338 if (strcmp(pers->name, clevel)==0)
344 /* return the offset of the super block in 512byte sectors */
345 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
347 sector_t num_sectors = bdev->bd_inode->i_size / 512;
348 return MD_NEW_SIZE_SECTORS(num_sectors);
351 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
353 sector_t num_sectors = rdev->sb_start;
356 num_sectors &= ~((sector_t)chunk_size/512 - 1);
360 static int alloc_disk_sb(mdk_rdev_t * rdev)
365 rdev->sb_page = alloc_page(GFP_KERNEL);
366 if (!rdev->sb_page) {
367 printk(KERN_ALERT "md: out of memory.\n");
374 static void free_disk_sb(mdk_rdev_t * rdev)
377 put_page(rdev->sb_page);
379 rdev->sb_page = NULL;
386 static void super_written(struct bio *bio, int error)
388 mdk_rdev_t *rdev = bio->bi_private;
389 mddev_t *mddev = rdev->mddev;
391 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
392 printk("md: super_written gets error=%d, uptodate=%d\n",
393 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
394 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
395 md_error(mddev, rdev);
398 if (atomic_dec_and_test(&mddev->pending_writes))
399 wake_up(&mddev->sb_wait);
403 static void super_written_barrier(struct bio *bio, int error)
405 struct bio *bio2 = bio->bi_private;
406 mdk_rdev_t *rdev = bio2->bi_private;
407 mddev_t *mddev = rdev->mddev;
409 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
410 error == -EOPNOTSUPP) {
412 /* barriers don't appear to be supported :-( */
413 set_bit(BarriersNotsupp, &rdev->flags);
414 mddev->barriers_work = 0;
415 spin_lock_irqsave(&mddev->write_lock, flags);
416 bio2->bi_next = mddev->biolist;
417 mddev->biolist = bio2;
418 spin_unlock_irqrestore(&mddev->write_lock, flags);
419 wake_up(&mddev->sb_wait);
423 bio->bi_private = rdev;
424 super_written(bio, error);
428 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
429 sector_t sector, int size, struct page *page)
431 /* write first size bytes of page to sector of rdev
432 * Increment mddev->pending_writes before returning
433 * and decrement it on completion, waking up sb_wait
434 * if zero is reached.
435 * If an error occurred, call md_error
437 * As we might need to resubmit the request if BIO_RW_BARRIER
438 * causes ENOTSUPP, we allocate a spare bio...
440 struct bio *bio = bio_alloc(GFP_NOIO, 1);
441 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
443 bio->bi_bdev = rdev->bdev;
444 bio->bi_sector = sector;
445 bio_add_page(bio, page, size, 0);
446 bio->bi_private = rdev;
447 bio->bi_end_io = super_written;
450 atomic_inc(&mddev->pending_writes);
451 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
453 rw |= (1<<BIO_RW_BARRIER);
454 rbio = bio_clone(bio, GFP_NOIO);
455 rbio->bi_private = bio;
456 rbio->bi_end_io = super_written_barrier;
457 submit_bio(rw, rbio);
462 void md_super_wait(mddev_t *mddev)
464 /* wait for all superblock writes that were scheduled to complete.
465 * if any had to be retried (due to BARRIER problems), retry them
469 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
470 if (atomic_read(&mddev->pending_writes)==0)
472 while (mddev->biolist) {
474 spin_lock_irq(&mddev->write_lock);
475 bio = mddev->biolist;
476 mddev->biolist = bio->bi_next ;
478 spin_unlock_irq(&mddev->write_lock);
479 submit_bio(bio->bi_rw, bio);
483 finish_wait(&mddev->sb_wait, &wq);
486 static void bi_complete(struct bio *bio, int error)
488 complete((struct completion*)bio->bi_private);
491 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
492 struct page *page, int rw)
494 struct bio *bio = bio_alloc(GFP_NOIO, 1);
495 struct completion event;
498 rw |= (1 << BIO_RW_SYNC);
501 bio->bi_sector = sector;
502 bio_add_page(bio, page, size, 0);
503 init_completion(&event);
504 bio->bi_private = &event;
505 bio->bi_end_io = bi_complete;
507 wait_for_completion(&event);
509 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
513 EXPORT_SYMBOL_GPL(sync_page_io);
515 static int read_disk_sb(mdk_rdev_t * rdev, int size)
517 char b[BDEVNAME_SIZE];
518 if (!rdev->sb_page) {
526 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
532 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
533 bdevname(rdev->bdev,b));
537 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
539 return sb1->set_uuid0 == sb2->set_uuid0 &&
540 sb1->set_uuid1 == sb2->set_uuid1 &&
541 sb1->set_uuid2 == sb2->set_uuid2 &&
542 sb1->set_uuid3 == sb2->set_uuid3;
545 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
548 mdp_super_t *tmp1, *tmp2;
550 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
551 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
553 if (!tmp1 || !tmp2) {
555 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
563 * nr_disks is not constant
568 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
576 static u32 md_csum_fold(u32 csum)
578 csum = (csum & 0xffff) + (csum >> 16);
579 return (csum & 0xffff) + (csum >> 16);
582 static unsigned int calc_sb_csum(mdp_super_t * sb)
585 u32 *sb32 = (u32*)sb;
587 unsigned int disk_csum, csum;
589 disk_csum = sb->sb_csum;
592 for (i = 0; i < MD_SB_BYTES/4 ; i++)
594 csum = (newcsum & 0xffffffff) + (newcsum>>32);
598 /* This used to use csum_partial, which was wrong for several
599 * reasons including that different results are returned on
600 * different architectures. It isn't critical that we get exactly
601 * the same return value as before (we always csum_fold before
602 * testing, and that removes any differences). However as we
603 * know that csum_partial always returned a 16bit value on
604 * alphas, do a fold to maximise conformity to previous behaviour.
606 sb->sb_csum = md_csum_fold(disk_csum);
608 sb->sb_csum = disk_csum;
615 * Handle superblock details.
616 * We want to be able to handle multiple superblock formats
617 * so we have a common interface to them all, and an array of
618 * different handlers.
619 * We rely on user-space to write the initial superblock, and support
620 * reading and updating of superblocks.
621 * Interface methods are:
622 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
623 * loads and validates a superblock on dev.
624 * if refdev != NULL, compare superblocks on both devices
626 * 0 - dev has a superblock that is compatible with refdev
627 * 1 - dev has a superblock that is compatible and newer than refdev
628 * so dev should be used as the refdev in future
629 * -EINVAL superblock incompatible or invalid
630 * -othererror e.g. -EIO
632 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
633 * Verify that dev is acceptable into mddev.
634 * The first time, mddev->raid_disks will be 0, and data from
635 * dev should be merged in. Subsequent calls check that dev
636 * is new enough. Return 0 or -EINVAL
638 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
639 * Update the superblock for rdev with data in mddev
640 * This does not write to disc.
646 struct module *owner;
647 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
649 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
650 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
651 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
652 sector_t num_sectors);
656 * load_super for 0.90.0
658 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
660 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
665 * Calculate the position of the superblock (512byte sectors),
666 * it's at the end of the disk.
668 * It also happens to be a multiple of 4Kb.
670 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
672 ret = read_disk_sb(rdev, MD_SB_BYTES);
677 bdevname(rdev->bdev, b);
678 sb = (mdp_super_t*)page_address(rdev->sb_page);
680 if (sb->md_magic != MD_SB_MAGIC) {
681 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
686 if (sb->major_version != 0 ||
687 sb->minor_version < 90 ||
688 sb->minor_version > 91) {
689 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
690 sb->major_version, sb->minor_version,
695 if (sb->raid_disks <= 0)
698 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
699 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
704 rdev->preferred_minor = sb->md_minor;
705 rdev->data_offset = 0;
706 rdev->sb_size = MD_SB_BYTES;
708 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
709 if (sb->level != 1 && sb->level != 4
710 && sb->level != 5 && sb->level != 6
711 && sb->level != 10) {
712 /* FIXME use a better test */
714 "md: bitmaps not supported for this level.\n");
719 if (sb->level == LEVEL_MULTIPATH)
722 rdev->desc_nr = sb->this_disk.number;
728 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
729 if (!uuid_equal(refsb, sb)) {
730 printk(KERN_WARNING "md: %s has different UUID to %s\n",
731 b, bdevname(refdev->bdev,b2));
734 if (!sb_equal(refsb, sb)) {
735 printk(KERN_WARNING "md: %s has same UUID"
736 " but different superblock to %s\n",
737 b, bdevname(refdev->bdev, b2));
741 ev2 = md_event(refsb);
747 rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2;
749 if (rdev->size < sb->size && sb->level > 1)
750 /* "this cannot possibly happen" ... */
758 * validate_super for 0.90.0
760 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
763 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
764 __u64 ev1 = md_event(sb);
766 rdev->raid_disk = -1;
767 clear_bit(Faulty, &rdev->flags);
768 clear_bit(In_sync, &rdev->flags);
769 clear_bit(WriteMostly, &rdev->flags);
770 clear_bit(BarriersNotsupp, &rdev->flags);
772 if (mddev->raid_disks == 0) {
773 mddev->major_version = 0;
774 mddev->minor_version = sb->minor_version;
775 mddev->patch_version = sb->patch_version;
777 mddev->chunk_size = sb->chunk_size;
778 mddev->ctime = sb->ctime;
779 mddev->utime = sb->utime;
780 mddev->level = sb->level;
781 mddev->clevel[0] = 0;
782 mddev->layout = sb->layout;
783 mddev->raid_disks = sb->raid_disks;
784 mddev->size = sb->size;
786 mddev->bitmap_offset = 0;
787 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
789 if (mddev->minor_version >= 91) {
790 mddev->reshape_position = sb->reshape_position;
791 mddev->delta_disks = sb->delta_disks;
792 mddev->new_level = sb->new_level;
793 mddev->new_layout = sb->new_layout;
794 mddev->new_chunk = sb->new_chunk;
796 mddev->reshape_position = MaxSector;
797 mddev->delta_disks = 0;
798 mddev->new_level = mddev->level;
799 mddev->new_layout = mddev->layout;
800 mddev->new_chunk = mddev->chunk_size;
803 if (sb->state & (1<<MD_SB_CLEAN))
804 mddev->recovery_cp = MaxSector;
806 if (sb->events_hi == sb->cp_events_hi &&
807 sb->events_lo == sb->cp_events_lo) {
808 mddev->recovery_cp = sb->recovery_cp;
810 mddev->recovery_cp = 0;
813 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
814 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
815 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
816 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
818 mddev->max_disks = MD_SB_DISKS;
820 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
821 mddev->bitmap_file == NULL)
822 mddev->bitmap_offset = mddev->default_bitmap_offset;
824 } else if (mddev->pers == NULL) {
825 /* Insist on good event counter while assembling */
827 if (ev1 < mddev->events)
829 } else if (mddev->bitmap) {
830 /* if adding to array with a bitmap, then we can accept an
831 * older device ... but not too old.
833 if (ev1 < mddev->bitmap->events_cleared)
836 if (ev1 < mddev->events)
837 /* just a hot-add of a new device, leave raid_disk at -1 */
841 if (mddev->level != LEVEL_MULTIPATH) {
842 desc = sb->disks + rdev->desc_nr;
844 if (desc->state & (1<<MD_DISK_FAULTY))
845 set_bit(Faulty, &rdev->flags);
846 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
847 desc->raid_disk < mddev->raid_disks */) {
848 set_bit(In_sync, &rdev->flags);
849 rdev->raid_disk = desc->raid_disk;
851 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
852 set_bit(WriteMostly, &rdev->flags);
853 } else /* MULTIPATH are always insync */
854 set_bit(In_sync, &rdev->flags);
859 * sync_super for 0.90.0
861 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
864 struct list_head *tmp;
866 int next_spare = mddev->raid_disks;
869 /* make rdev->sb match mddev data..
872 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
873 * 3/ any empty disks < next_spare become removed
875 * disks[0] gets initialised to REMOVED because
876 * we cannot be sure from other fields if it has
877 * been initialised or not.
880 int active=0, working=0,failed=0,spare=0,nr_disks=0;
882 rdev->sb_size = MD_SB_BYTES;
884 sb = (mdp_super_t*)page_address(rdev->sb_page);
886 memset(sb, 0, sizeof(*sb));
888 sb->md_magic = MD_SB_MAGIC;
889 sb->major_version = mddev->major_version;
890 sb->patch_version = mddev->patch_version;
891 sb->gvalid_words = 0; /* ignored */
892 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
893 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
894 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
895 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
897 sb->ctime = mddev->ctime;
898 sb->level = mddev->level;
899 sb->size = mddev->size;
900 sb->raid_disks = mddev->raid_disks;
901 sb->md_minor = mddev->md_minor;
902 sb->not_persistent = 0;
903 sb->utime = mddev->utime;
905 sb->events_hi = (mddev->events>>32);
906 sb->events_lo = (u32)mddev->events;
908 if (mddev->reshape_position == MaxSector)
909 sb->minor_version = 90;
911 sb->minor_version = 91;
912 sb->reshape_position = mddev->reshape_position;
913 sb->new_level = mddev->new_level;
914 sb->delta_disks = mddev->delta_disks;
915 sb->new_layout = mddev->new_layout;
916 sb->new_chunk = mddev->new_chunk;
918 mddev->minor_version = sb->minor_version;
921 sb->recovery_cp = mddev->recovery_cp;
922 sb->cp_events_hi = (mddev->events>>32);
923 sb->cp_events_lo = (u32)mddev->events;
924 if (mddev->recovery_cp == MaxSector)
925 sb->state = (1<< MD_SB_CLEAN);
929 sb->layout = mddev->layout;
930 sb->chunk_size = mddev->chunk_size;
932 if (mddev->bitmap && mddev->bitmap_file == NULL)
933 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
935 sb->disks[0].state = (1<<MD_DISK_REMOVED);
936 rdev_for_each(rdev2, tmp, mddev) {
939 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
940 && !test_bit(Faulty, &rdev2->flags))
941 desc_nr = rdev2->raid_disk;
943 desc_nr = next_spare++;
944 rdev2->desc_nr = desc_nr;
945 d = &sb->disks[rdev2->desc_nr];
947 d->number = rdev2->desc_nr;
948 d->major = MAJOR(rdev2->bdev->bd_dev);
949 d->minor = MINOR(rdev2->bdev->bd_dev);
950 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
951 && !test_bit(Faulty, &rdev2->flags))
952 d->raid_disk = rdev2->raid_disk;
954 d->raid_disk = rdev2->desc_nr; /* compatibility */
955 if (test_bit(Faulty, &rdev2->flags))
956 d->state = (1<<MD_DISK_FAULTY);
957 else if (test_bit(In_sync, &rdev2->flags)) {
958 d->state = (1<<MD_DISK_ACTIVE);
959 d->state |= (1<<MD_DISK_SYNC);
967 if (test_bit(WriteMostly, &rdev2->flags))
968 d->state |= (1<<MD_DISK_WRITEMOSTLY);
970 /* now set the "removed" and "faulty" bits on any missing devices */
971 for (i=0 ; i < mddev->raid_disks ; i++) {
972 mdp_disk_t *d = &sb->disks[i];
973 if (d->state == 0 && d->number == 0) {
976 d->state = (1<<MD_DISK_REMOVED);
977 d->state |= (1<<MD_DISK_FAULTY);
981 sb->nr_disks = nr_disks;
982 sb->active_disks = active;
983 sb->working_disks = working;
984 sb->failed_disks = failed;
985 sb->spare_disks = spare;
987 sb->this_disk = sb->disks[rdev->desc_nr];
988 sb->sb_csum = calc_sb_csum(sb);
992 * rdev_size_change for 0.90.0
994 static unsigned long long
995 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
997 if (num_sectors && num_sectors < rdev->mddev->size * 2)
998 return 0; /* component must fit device */
999 if (rdev->mddev->bitmap_offset)
1000 return 0; /* can't move bitmap */
1001 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
1002 if (!num_sectors || num_sectors > rdev->sb_start)
1003 num_sectors = rdev->sb_start;
1004 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1006 md_super_wait(rdev->mddev);
1007 return num_sectors / 2; /* kB for sysfs */
1012 * version 1 superblock
1015 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1019 unsigned long long newcsum;
1020 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1021 __le32 *isuper = (__le32*)sb;
1024 disk_csum = sb->sb_csum;
1027 for (i=0; size>=4; size -= 4 )
1028 newcsum += le32_to_cpu(*isuper++);
1031 newcsum += le16_to_cpu(*(__le16*) isuper);
1033 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1034 sb->sb_csum = disk_csum;
1035 return cpu_to_le32(csum);
1038 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1040 struct mdp_superblock_1 *sb;
1043 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1047 * Calculate the position of the superblock in 512byte sectors.
1048 * It is always aligned to a 4K boundary and
1049 * depeding on minor_version, it can be:
1050 * 0: At least 8K, but less than 12K, from end of device
1051 * 1: At start of device
1052 * 2: 4K from start of device.
1054 switch(minor_version) {
1056 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1058 sb_start &= ~(sector_t)(4*2-1);
1069 rdev->sb_start = sb_start;
1071 /* superblock is rarely larger than 1K, but it can be larger,
1072 * and it is safe to read 4k, so we do that
1074 ret = read_disk_sb(rdev, 4096);
1075 if (ret) return ret;
1078 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1080 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1081 sb->major_version != cpu_to_le32(1) ||
1082 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1083 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1084 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1087 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1088 printk("md: invalid superblock checksum on %s\n",
1089 bdevname(rdev->bdev,b));
1092 if (le64_to_cpu(sb->data_size) < 10) {
1093 printk("md: data_size too small on %s\n",
1094 bdevname(rdev->bdev,b));
1097 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1098 if (sb->level != cpu_to_le32(1) &&
1099 sb->level != cpu_to_le32(4) &&
1100 sb->level != cpu_to_le32(5) &&
1101 sb->level != cpu_to_le32(6) &&
1102 sb->level != cpu_to_le32(10)) {
1104 "md: bitmaps not supported for this level.\n");
1109 rdev->preferred_minor = 0xffff;
1110 rdev->data_offset = le64_to_cpu(sb->data_offset);
1111 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1113 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1114 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1115 if (rdev->sb_size & bmask)
1116 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1119 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1122 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1125 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1131 struct mdp_superblock_1 *refsb =
1132 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1134 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1135 sb->level != refsb->level ||
1136 sb->layout != refsb->layout ||
1137 sb->chunksize != refsb->chunksize) {
1138 printk(KERN_WARNING "md: %s has strangely different"
1139 " superblock to %s\n",
1140 bdevname(rdev->bdev,b),
1141 bdevname(refdev->bdev,b2));
1144 ev1 = le64_to_cpu(sb->events);
1145 ev2 = le64_to_cpu(refsb->events);
1153 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1155 rdev->size = rdev->sb_start / 2;
1156 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1158 rdev->size = le64_to_cpu(sb->data_size)/2;
1159 if (le32_to_cpu(sb->chunksize))
1160 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1162 if (le64_to_cpu(sb->size) > rdev->size*2)
1167 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1169 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1170 __u64 ev1 = le64_to_cpu(sb->events);
1172 rdev->raid_disk = -1;
1173 clear_bit(Faulty, &rdev->flags);
1174 clear_bit(In_sync, &rdev->flags);
1175 clear_bit(WriteMostly, &rdev->flags);
1176 clear_bit(BarriersNotsupp, &rdev->flags);
1178 if (mddev->raid_disks == 0) {
1179 mddev->major_version = 1;
1180 mddev->patch_version = 0;
1181 mddev->external = 0;
1182 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1183 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1184 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1185 mddev->level = le32_to_cpu(sb->level);
1186 mddev->clevel[0] = 0;
1187 mddev->layout = le32_to_cpu(sb->layout);
1188 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1189 mddev->size = le64_to_cpu(sb->size)/2;
1190 mddev->events = ev1;
1191 mddev->bitmap_offset = 0;
1192 mddev->default_bitmap_offset = 1024 >> 9;
1194 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1195 memcpy(mddev->uuid, sb->set_uuid, 16);
1197 mddev->max_disks = (4096-256)/2;
1199 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1200 mddev->bitmap_file == NULL )
1201 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1203 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1204 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1205 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1206 mddev->new_level = le32_to_cpu(sb->new_level);
1207 mddev->new_layout = le32_to_cpu(sb->new_layout);
1208 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1210 mddev->reshape_position = MaxSector;
1211 mddev->delta_disks = 0;
1212 mddev->new_level = mddev->level;
1213 mddev->new_layout = mddev->layout;
1214 mddev->new_chunk = mddev->chunk_size;
1217 } else if (mddev->pers == NULL) {
1218 /* Insist of good event counter while assembling */
1220 if (ev1 < mddev->events)
1222 } else if (mddev->bitmap) {
1223 /* If adding to array with a bitmap, then we can accept an
1224 * older device, but not too old.
1226 if (ev1 < mddev->bitmap->events_cleared)
1229 if (ev1 < mddev->events)
1230 /* just a hot-add of a new device, leave raid_disk at -1 */
1233 if (mddev->level != LEVEL_MULTIPATH) {
1235 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1237 case 0xffff: /* spare */
1239 case 0xfffe: /* faulty */
1240 set_bit(Faulty, &rdev->flags);
1243 if ((le32_to_cpu(sb->feature_map) &
1244 MD_FEATURE_RECOVERY_OFFSET))
1245 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1247 set_bit(In_sync, &rdev->flags);
1248 rdev->raid_disk = role;
1251 if (sb->devflags & WriteMostly1)
1252 set_bit(WriteMostly, &rdev->flags);
1253 } else /* MULTIPATH are always insync */
1254 set_bit(In_sync, &rdev->flags);
1259 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1261 struct mdp_superblock_1 *sb;
1262 struct list_head *tmp;
1265 /* make rdev->sb match mddev and rdev data. */
1267 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1269 sb->feature_map = 0;
1271 sb->recovery_offset = cpu_to_le64(0);
1272 memset(sb->pad1, 0, sizeof(sb->pad1));
1273 memset(sb->pad2, 0, sizeof(sb->pad2));
1274 memset(sb->pad3, 0, sizeof(sb->pad3));
1276 sb->utime = cpu_to_le64((__u64)mddev->utime);
1277 sb->events = cpu_to_le64(mddev->events);
1279 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1281 sb->resync_offset = cpu_to_le64(0);
1283 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1285 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1286 sb->size = cpu_to_le64(mddev->size<<1);
1288 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1289 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1290 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1293 if (rdev->raid_disk >= 0 &&
1294 !test_bit(In_sync, &rdev->flags) &&
1295 rdev->recovery_offset > 0) {
1296 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1297 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1300 if (mddev->reshape_position != MaxSector) {
1301 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1302 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1303 sb->new_layout = cpu_to_le32(mddev->new_layout);
1304 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1305 sb->new_level = cpu_to_le32(mddev->new_level);
1306 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1310 rdev_for_each(rdev2, tmp, mddev)
1311 if (rdev2->desc_nr+1 > max_dev)
1312 max_dev = rdev2->desc_nr+1;
1314 if (max_dev > le32_to_cpu(sb->max_dev))
1315 sb->max_dev = cpu_to_le32(max_dev);
1316 for (i=0; i<max_dev;i++)
1317 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1319 rdev_for_each(rdev2, tmp, mddev) {
1321 if (test_bit(Faulty, &rdev2->flags))
1322 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1323 else if (test_bit(In_sync, &rdev2->flags))
1324 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1325 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1326 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1328 sb->dev_roles[i] = cpu_to_le16(0xffff);
1331 sb->sb_csum = calc_sb_1_csum(sb);
1334 static unsigned long long
1335 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1337 struct mdp_superblock_1 *sb;
1338 sector_t max_sectors;
1339 if (num_sectors && num_sectors < rdev->mddev->size * 2)
1340 return 0; /* component must fit device */
1341 if (rdev->sb_start < rdev->data_offset) {
1342 /* minor versions 1 and 2; superblock before data */
1343 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1344 max_sectors -= rdev->data_offset;
1345 if (!num_sectors || num_sectors > max_sectors)
1346 num_sectors = max_sectors;
1347 } else if (rdev->mddev->bitmap_offset) {
1348 /* minor version 0 with bitmap we can't move */
1351 /* minor version 0; superblock after data */
1353 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1354 sb_start &= ~(sector_t)(4*2 - 1);
1355 max_sectors = rdev->size * 2 + sb_start - rdev->sb_start;
1356 if (!num_sectors || num_sectors > max_sectors)
1357 num_sectors = max_sectors;
1358 rdev->sb_start = sb_start;
1360 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1361 sb->data_size = cpu_to_le64(num_sectors);
1362 sb->super_offset = rdev->sb_start;
1363 sb->sb_csum = calc_sb_1_csum(sb);
1364 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1366 md_super_wait(rdev->mddev);
1367 return num_sectors / 2; /* kB for sysfs */
1370 static struct super_type super_types[] = {
1373 .owner = THIS_MODULE,
1374 .load_super = super_90_load,
1375 .validate_super = super_90_validate,
1376 .sync_super = super_90_sync,
1377 .rdev_size_change = super_90_rdev_size_change,
1381 .owner = THIS_MODULE,
1382 .load_super = super_1_load,
1383 .validate_super = super_1_validate,
1384 .sync_super = super_1_sync,
1385 .rdev_size_change = super_1_rdev_size_change,
1389 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1391 mdk_rdev_t *rdev, *rdev2;
1394 rdev_for_each_rcu(rdev, mddev1)
1395 rdev_for_each_rcu(rdev2, mddev2)
1396 if (rdev->bdev->bd_contains ==
1397 rdev2->bdev->bd_contains) {
1405 static LIST_HEAD(pending_raid_disks);
1407 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1409 char b[BDEVNAME_SIZE];
1419 /* prevent duplicates */
1420 if (find_rdev(mddev, rdev->bdev->bd_dev))
1423 /* make sure rdev->size exceeds mddev->size */
1424 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1426 /* Cannot change size, so fail
1427 * If mddev->level <= 0, then we don't care
1428 * about aligning sizes (e.g. linear)
1430 if (mddev->level > 0)
1433 mddev->size = rdev->size;
1436 /* Verify rdev->desc_nr is unique.
1437 * If it is -1, assign a free number, else
1438 * check number is not in use
1440 if (rdev->desc_nr < 0) {
1442 if (mddev->pers) choice = mddev->raid_disks;
1443 while (find_rdev_nr(mddev, choice))
1445 rdev->desc_nr = choice;
1447 if (find_rdev_nr(mddev, rdev->desc_nr))
1450 bdevname(rdev->bdev,b);
1451 while ( (s=strchr(b, '/')) != NULL)
1454 rdev->mddev = mddev;
1455 printk(KERN_INFO "md: bind<%s>\n", b);
1457 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1460 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1461 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1462 kobject_del(&rdev->kobj);
1465 list_add_rcu(&rdev->same_set, &mddev->disks);
1466 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1470 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1475 static void md_delayed_delete(struct work_struct *ws)
1477 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1478 kobject_del(&rdev->kobj);
1479 kobject_put(&rdev->kobj);
1482 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1484 char b[BDEVNAME_SIZE];
1489 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1490 list_del_rcu(&rdev->same_set);
1491 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1493 sysfs_remove_link(&rdev->kobj, "block");
1495 /* We need to delay this, otherwise we can deadlock when
1496 * writing to 'remove' to "dev/state". We also need
1497 * to delay it due to rcu usage.
1500 INIT_WORK(&rdev->del_work, md_delayed_delete);
1501 kobject_get(&rdev->kobj);
1502 schedule_work(&rdev->del_work);
1506 * prevent the device from being mounted, repartitioned or
1507 * otherwise reused by a RAID array (or any other kernel
1508 * subsystem), by bd_claiming the device.
1510 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1513 struct block_device *bdev;
1514 char b[BDEVNAME_SIZE];
1516 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1518 printk(KERN_ERR "md: could not open %s.\n",
1519 __bdevname(dev, b));
1520 return PTR_ERR(bdev);
1522 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1524 printk(KERN_ERR "md: could not bd_claim %s.\n",
1530 set_bit(AllReserved, &rdev->flags);
1535 static void unlock_rdev(mdk_rdev_t *rdev)
1537 struct block_device *bdev = rdev->bdev;
1545 void md_autodetect_dev(dev_t dev);
1547 static void export_rdev(mdk_rdev_t * rdev)
1549 char b[BDEVNAME_SIZE];
1550 printk(KERN_INFO "md: export_rdev(%s)\n",
1551 bdevname(rdev->bdev,b));
1556 if (test_bit(AutoDetected, &rdev->flags))
1557 md_autodetect_dev(rdev->bdev->bd_dev);
1560 kobject_put(&rdev->kobj);
1563 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1565 unbind_rdev_from_array(rdev);
1569 static void export_array(mddev_t *mddev)
1571 struct list_head *tmp;
1574 rdev_for_each(rdev, tmp, mddev) {
1579 kick_rdev_from_array(rdev);
1581 if (!list_empty(&mddev->disks))
1583 mddev->raid_disks = 0;
1584 mddev->major_version = 0;
1587 static void print_desc(mdp_disk_t *desc)
1589 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1590 desc->major,desc->minor,desc->raid_disk,desc->state);
1593 static void print_sb(mdp_super_t *sb)
1598 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1599 sb->major_version, sb->minor_version, sb->patch_version,
1600 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1602 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1603 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1604 sb->md_minor, sb->layout, sb->chunk_size);
1605 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1606 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1607 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1608 sb->failed_disks, sb->spare_disks,
1609 sb->sb_csum, (unsigned long)sb->events_lo);
1612 for (i = 0; i < MD_SB_DISKS; i++) {
1615 desc = sb->disks + i;
1616 if (desc->number || desc->major || desc->minor ||
1617 desc->raid_disk || (desc->state && (desc->state != 4))) {
1618 printk(" D %2d: ", i);
1622 printk(KERN_INFO "md: THIS: ");
1623 print_desc(&sb->this_disk);
1627 static void print_rdev(mdk_rdev_t *rdev)
1629 char b[BDEVNAME_SIZE];
1630 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1631 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1632 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1634 if (rdev->sb_loaded) {
1635 printk(KERN_INFO "md: rdev superblock:\n");
1636 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1638 printk(KERN_INFO "md: no rdev superblock!\n");
1641 static void md_print_devices(void)
1643 struct list_head *tmp, *tmp2;
1646 char b[BDEVNAME_SIZE];
1649 printk("md: **********************************\n");
1650 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1651 printk("md: **********************************\n");
1652 for_each_mddev(mddev, tmp) {
1655 bitmap_print_sb(mddev->bitmap);
1657 printk("%s: ", mdname(mddev));
1658 rdev_for_each(rdev, tmp2, mddev)
1659 printk("<%s>", bdevname(rdev->bdev,b));
1662 rdev_for_each(rdev, tmp2, mddev)
1665 printk("md: **********************************\n");
1670 static void sync_sbs(mddev_t * mddev, int nospares)
1672 /* Update each superblock (in-memory image), but
1673 * if we are allowed to, skip spares which already
1674 * have the right event counter, or have one earlier
1675 * (which would mean they aren't being marked as dirty
1676 * with the rest of the array)
1679 struct list_head *tmp;
1681 rdev_for_each(rdev, tmp, mddev) {
1682 if (rdev->sb_events == mddev->events ||
1684 rdev->raid_disk < 0 &&
1685 (rdev->sb_events&1)==0 &&
1686 rdev->sb_events+1 == mddev->events)) {
1687 /* Don't update this superblock */
1688 rdev->sb_loaded = 2;
1690 super_types[mddev->major_version].
1691 sync_super(mddev, rdev);
1692 rdev->sb_loaded = 1;
1697 static void md_update_sb(mddev_t * mddev, int force_change)
1699 struct list_head *tmp;
1704 if (mddev->external)
1707 spin_lock_irq(&mddev->write_lock);
1709 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1710 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1712 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1713 /* just a clean<-> dirty transition, possibly leave spares alone,
1714 * though if events isn't the right even/odd, we will have to do
1720 if (mddev->degraded)
1721 /* If the array is degraded, then skipping spares is both
1722 * dangerous and fairly pointless.
1723 * Dangerous because a device that was removed from the array
1724 * might have a event_count that still looks up-to-date,
1725 * so it can be re-added without a resync.
1726 * Pointless because if there are any spares to skip,
1727 * then a recovery will happen and soon that array won't
1728 * be degraded any more and the spare can go back to sleep then.
1732 sync_req = mddev->in_sync;
1733 mddev->utime = get_seconds();
1735 /* If this is just a dirty<->clean transition, and the array is clean
1736 * and 'events' is odd, we can roll back to the previous clean state */
1738 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1739 && (mddev->events & 1)
1740 && mddev->events != 1)
1743 /* otherwise we have to go forward and ... */
1745 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1746 /* .. if the array isn't clean, insist on an odd 'events' */
1747 if ((mddev->events&1)==0) {
1752 /* otherwise insist on an even 'events' (for clean states) */
1753 if ((mddev->events&1)) {
1760 if (!mddev->events) {
1762 * oops, this 64-bit counter should never wrap.
1763 * Either we are in around ~1 trillion A.C., assuming
1764 * 1 reboot per second, or we have a bug:
1771 * do not write anything to disk if using
1772 * nonpersistent superblocks
1774 if (!mddev->persistent) {
1775 if (!mddev->external)
1776 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1778 spin_unlock_irq(&mddev->write_lock);
1779 wake_up(&mddev->sb_wait);
1782 sync_sbs(mddev, nospares);
1783 spin_unlock_irq(&mddev->write_lock);
1786 "md: updating %s RAID superblock on device (in sync %d)\n",
1787 mdname(mddev),mddev->in_sync);
1789 bitmap_update_sb(mddev->bitmap);
1790 rdev_for_each(rdev, tmp, mddev) {
1791 char b[BDEVNAME_SIZE];
1792 dprintk(KERN_INFO "md: ");
1793 if (rdev->sb_loaded != 1)
1794 continue; /* no noise on spare devices */
1795 if (test_bit(Faulty, &rdev->flags))
1796 dprintk("(skipping faulty ");
1798 dprintk("%s ", bdevname(rdev->bdev,b));
1799 if (!test_bit(Faulty, &rdev->flags)) {
1800 md_super_write(mddev,rdev,
1801 rdev->sb_start, rdev->sb_size,
1803 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1804 bdevname(rdev->bdev,b),
1805 (unsigned long long)rdev->sb_start);
1806 rdev->sb_events = mddev->events;
1810 if (mddev->level == LEVEL_MULTIPATH)
1811 /* only need to write one superblock... */
1814 md_super_wait(mddev);
1815 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1817 spin_lock_irq(&mddev->write_lock);
1818 if (mddev->in_sync != sync_req ||
1819 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1820 /* have to write it out again */
1821 spin_unlock_irq(&mddev->write_lock);
1824 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1825 spin_unlock_irq(&mddev->write_lock);
1826 wake_up(&mddev->sb_wait);
1830 /* words written to sysfs files may, or may not, be \n terminated.
1831 * We want to accept with case. For this we use cmd_match.
1833 static int cmd_match(const char *cmd, const char *str)
1835 /* See if cmd, written into a sysfs file, matches
1836 * str. They must either be the same, or cmd can
1837 * have a trailing newline
1839 while (*cmd && *str && *cmd == *str) {
1850 struct rdev_sysfs_entry {
1851 struct attribute attr;
1852 ssize_t (*show)(mdk_rdev_t *, char *);
1853 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1857 state_show(mdk_rdev_t *rdev, char *page)
1862 if (test_bit(Faulty, &rdev->flags)) {
1863 len+= sprintf(page+len, "%sfaulty",sep);
1866 if (test_bit(In_sync, &rdev->flags)) {
1867 len += sprintf(page+len, "%sin_sync",sep);
1870 if (test_bit(WriteMostly, &rdev->flags)) {
1871 len += sprintf(page+len, "%swrite_mostly",sep);
1874 if (test_bit(Blocked, &rdev->flags)) {
1875 len += sprintf(page+len, "%sblocked", sep);
1878 if (!test_bit(Faulty, &rdev->flags) &&
1879 !test_bit(In_sync, &rdev->flags)) {
1880 len += sprintf(page+len, "%sspare", sep);
1883 return len+sprintf(page+len, "\n");
1887 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1890 * faulty - simulates and error
1891 * remove - disconnects the device
1892 * writemostly - sets write_mostly
1893 * -writemostly - clears write_mostly
1894 * blocked - sets the Blocked flag
1895 * -blocked - clears the Blocked flag
1898 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1899 md_error(rdev->mddev, rdev);
1901 } else if (cmd_match(buf, "remove")) {
1902 if (rdev->raid_disk >= 0)
1905 mddev_t *mddev = rdev->mddev;
1906 kick_rdev_from_array(rdev);
1908 md_update_sb(mddev, 1);
1909 md_new_event(mddev);
1912 } else if (cmd_match(buf, "writemostly")) {
1913 set_bit(WriteMostly, &rdev->flags);
1915 } else if (cmd_match(buf, "-writemostly")) {
1916 clear_bit(WriteMostly, &rdev->flags);
1918 } else if (cmd_match(buf, "blocked")) {
1919 set_bit(Blocked, &rdev->flags);
1921 } else if (cmd_match(buf, "-blocked")) {
1922 clear_bit(Blocked, &rdev->flags);
1923 wake_up(&rdev->blocked_wait);
1924 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1925 md_wakeup_thread(rdev->mddev->thread);
1930 sysfs_notify(&rdev->kobj, NULL, "state");
1931 return err ? err : len;
1933 static struct rdev_sysfs_entry rdev_state =
1934 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1937 errors_show(mdk_rdev_t *rdev, char *page)
1939 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1943 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1946 unsigned long n = simple_strtoul(buf, &e, 10);
1947 if (*buf && (*e == 0 || *e == '\n')) {
1948 atomic_set(&rdev->corrected_errors, n);
1953 static struct rdev_sysfs_entry rdev_errors =
1954 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1957 slot_show(mdk_rdev_t *rdev, char *page)
1959 if (rdev->raid_disk < 0)
1960 return sprintf(page, "none\n");
1962 return sprintf(page, "%d\n", rdev->raid_disk);
1966 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1971 int slot = simple_strtoul(buf, &e, 10);
1972 if (strncmp(buf, "none", 4)==0)
1974 else if (e==buf || (*e && *e!= '\n'))
1976 if (rdev->mddev->pers && slot == -1) {
1977 /* Setting 'slot' on an active array requires also
1978 * updating the 'rd%d' link, and communicating
1979 * with the personality with ->hot_*_disk.
1980 * For now we only support removing
1981 * failed/spare devices. This normally happens automatically,
1982 * but not when the metadata is externally managed.
1984 if (rdev->raid_disk == -1)
1986 /* personality does all needed checks */
1987 if (rdev->mddev->pers->hot_add_disk == NULL)
1989 err = rdev->mddev->pers->
1990 hot_remove_disk(rdev->mddev, rdev->raid_disk);
1993 sprintf(nm, "rd%d", rdev->raid_disk);
1994 sysfs_remove_link(&rdev->mddev->kobj, nm);
1995 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1996 md_wakeup_thread(rdev->mddev->thread);
1997 } else if (rdev->mddev->pers) {
1999 struct list_head *tmp;
2000 /* Activating a spare .. or possibly reactivating
2001 * if we every get bitmaps working here.
2004 if (rdev->raid_disk != -1)
2007 if (rdev->mddev->pers->hot_add_disk == NULL)
2010 rdev_for_each(rdev2, tmp, rdev->mddev)
2011 if (rdev2->raid_disk == slot)
2014 rdev->raid_disk = slot;
2015 if (test_bit(In_sync, &rdev->flags))
2016 rdev->saved_raid_disk = slot;
2018 rdev->saved_raid_disk = -1;
2019 err = rdev->mddev->pers->
2020 hot_add_disk(rdev->mddev, rdev);
2022 rdev->raid_disk = -1;
2025 sysfs_notify(&rdev->kobj, NULL, "state");
2026 sprintf(nm, "rd%d", rdev->raid_disk);
2027 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2029 "md: cannot register "
2031 nm, mdname(rdev->mddev));
2033 /* don't wakeup anyone, leave that to userspace. */
2035 if (slot >= rdev->mddev->raid_disks)
2037 rdev->raid_disk = slot;
2038 /* assume it is working */
2039 clear_bit(Faulty, &rdev->flags);
2040 clear_bit(WriteMostly, &rdev->flags);
2041 set_bit(In_sync, &rdev->flags);
2042 sysfs_notify(&rdev->kobj, NULL, "state");
2048 static struct rdev_sysfs_entry rdev_slot =
2049 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2052 offset_show(mdk_rdev_t *rdev, char *page)
2054 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2058 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2061 unsigned long long offset = simple_strtoull(buf, &e, 10);
2062 if (e==buf || (*e && *e != '\n'))
2064 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2066 if (rdev->size && rdev->mddev->external)
2067 /* Must set offset before size, so overlap checks
2070 rdev->data_offset = offset;
2074 static struct rdev_sysfs_entry rdev_offset =
2075 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2078 rdev_size_show(mdk_rdev_t *rdev, char *page)
2080 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2083 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2085 /* check if two start/length pairs overlap */
2094 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2096 unsigned long long size;
2097 unsigned long long oldsize = rdev->size;
2098 mddev_t *my_mddev = rdev->mddev;
2100 if (strict_strtoull(buf, 10, &size) < 0)
2102 if (my_mddev->pers && rdev->raid_disk >= 0) {
2103 if (my_mddev->persistent) {
2104 size = super_types[my_mddev->major_version].
2105 rdev_size_change(rdev, size * 2);
2109 size = (rdev->bdev->bd_inode->i_size >> 10);
2110 size -= rdev->data_offset/2;
2113 if (size < my_mddev->size)
2114 return -EINVAL; /* component must fit device */
2117 if (size > oldsize && my_mddev->external) {
2118 /* need to check that all other rdevs with the same ->bdev
2119 * do not overlap. We need to unlock the mddev to avoid
2120 * a deadlock. We have already changed rdev->size, and if
2121 * we have to change it back, we will have the lock again.
2125 struct list_head *tmp, *tmp2;
2127 mddev_unlock(my_mddev);
2128 for_each_mddev(mddev, tmp) {
2132 rdev_for_each(rdev2, tmp2, mddev)
2133 if (test_bit(AllReserved, &rdev2->flags) ||
2134 (rdev->bdev == rdev2->bdev &&
2136 overlaps(rdev->data_offset, rdev->size * 2,
2138 rdev2->size * 2))) {
2142 mddev_unlock(mddev);
2148 mddev_lock(my_mddev);
2150 /* Someone else could have slipped in a size
2151 * change here, but doing so is just silly.
2152 * We put oldsize back because we *know* it is
2153 * safe, and trust userspace not to race with
2156 rdev->size = oldsize;
2163 static struct rdev_sysfs_entry rdev_size =
2164 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2166 static struct attribute *rdev_default_attrs[] = {
2175 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2177 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2178 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2179 mddev_t *mddev = rdev->mddev;
2185 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2187 if (rdev->mddev == NULL)
2190 rv = entry->show(rdev, page);
2191 mddev_unlock(mddev);
2197 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2198 const char *page, size_t length)
2200 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2201 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2203 mddev_t *mddev = rdev->mddev;
2207 if (!capable(CAP_SYS_ADMIN))
2209 rv = mddev ? mddev_lock(mddev): -EBUSY;
2211 if (rdev->mddev == NULL)
2214 rv = entry->store(rdev, page, length);
2215 mddev_unlock(mddev);
2220 static void rdev_free(struct kobject *ko)
2222 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2225 static struct sysfs_ops rdev_sysfs_ops = {
2226 .show = rdev_attr_show,
2227 .store = rdev_attr_store,
2229 static struct kobj_type rdev_ktype = {
2230 .release = rdev_free,
2231 .sysfs_ops = &rdev_sysfs_ops,
2232 .default_attrs = rdev_default_attrs,
2236 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2238 * mark the device faulty if:
2240 * - the device is nonexistent (zero size)
2241 * - the device has no valid superblock
2243 * a faulty rdev _never_ has rdev->sb set.
2245 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2247 char b[BDEVNAME_SIZE];
2252 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2254 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2255 return ERR_PTR(-ENOMEM);
2258 if ((err = alloc_disk_sb(rdev)))
2261 err = lock_rdev(rdev, newdev, super_format == -2);
2265 kobject_init(&rdev->kobj, &rdev_ktype);
2268 rdev->saved_raid_disk = -1;
2269 rdev->raid_disk = -1;
2271 rdev->data_offset = 0;
2272 rdev->sb_events = 0;
2273 atomic_set(&rdev->nr_pending, 0);
2274 atomic_set(&rdev->read_errors, 0);
2275 atomic_set(&rdev->corrected_errors, 0);
2277 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2280 "md: %s has zero or unknown size, marking faulty!\n",
2281 bdevname(rdev->bdev,b));
2286 if (super_format >= 0) {
2287 err = super_types[super_format].
2288 load_super(rdev, NULL, super_minor);
2289 if (err == -EINVAL) {
2291 "md: %s does not have a valid v%d.%d "
2292 "superblock, not importing!\n",
2293 bdevname(rdev->bdev,b),
2294 super_format, super_minor);
2299 "md: could not read %s's sb, not importing!\n",
2300 bdevname(rdev->bdev,b));
2305 INIT_LIST_HEAD(&rdev->same_set);
2306 init_waitqueue_head(&rdev->blocked_wait);
2311 if (rdev->sb_page) {
2317 return ERR_PTR(err);
2321 * Check a full RAID array for plausibility
2325 static void analyze_sbs(mddev_t * mddev)
2328 struct list_head *tmp;
2329 mdk_rdev_t *rdev, *freshest;
2330 char b[BDEVNAME_SIZE];
2333 rdev_for_each(rdev, tmp, mddev)
2334 switch (super_types[mddev->major_version].
2335 load_super(rdev, freshest, mddev->minor_version)) {
2343 "md: fatal superblock inconsistency in %s"
2344 " -- removing from array\n",
2345 bdevname(rdev->bdev,b));
2346 kick_rdev_from_array(rdev);
2350 super_types[mddev->major_version].
2351 validate_super(mddev, freshest);
2354 rdev_for_each(rdev, tmp, mddev) {
2355 if (rdev != freshest)
2356 if (super_types[mddev->major_version].
2357 validate_super(mddev, rdev)) {
2358 printk(KERN_WARNING "md: kicking non-fresh %s"
2360 bdevname(rdev->bdev,b));
2361 kick_rdev_from_array(rdev);
2364 if (mddev->level == LEVEL_MULTIPATH) {
2365 rdev->desc_nr = i++;
2366 rdev->raid_disk = rdev->desc_nr;
2367 set_bit(In_sync, &rdev->flags);
2368 } else if (rdev->raid_disk >= mddev->raid_disks) {
2369 rdev->raid_disk = -1;
2370 clear_bit(In_sync, &rdev->flags);
2376 if (mddev->recovery_cp != MaxSector &&
2378 printk(KERN_ERR "md: %s: raid array is not clean"
2379 " -- starting background reconstruction\n",
2384 static void md_safemode_timeout(unsigned long data);
2387 safe_delay_show(mddev_t *mddev, char *page)
2389 int msec = (mddev->safemode_delay*1000)/HZ;
2390 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2393 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2401 /* remove a period, and count digits after it */
2402 if (len >= sizeof(buf))
2404 strlcpy(buf, cbuf, sizeof(buf));
2405 for (i=0; i<len; i++) {
2407 if (isdigit(buf[i])) {
2412 } else if (buf[i] == '.') {
2417 if (strict_strtoul(buf, 10, &msec) < 0)
2419 msec = (msec * 1000) / scale;
2421 mddev->safemode_delay = 0;
2423 unsigned long old_delay = mddev->safemode_delay;
2424 mddev->safemode_delay = (msec*HZ)/1000;
2425 if (mddev->safemode_delay == 0)
2426 mddev->safemode_delay = 1;
2427 if (mddev->safemode_delay < old_delay)
2428 md_safemode_timeout((unsigned long)mddev);
2432 static struct md_sysfs_entry md_safe_delay =
2433 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2436 level_show(mddev_t *mddev, char *page)
2438 struct mdk_personality *p = mddev->pers;
2440 return sprintf(page, "%s\n", p->name);
2441 else if (mddev->clevel[0])
2442 return sprintf(page, "%s\n", mddev->clevel);
2443 else if (mddev->level != LEVEL_NONE)
2444 return sprintf(page, "%d\n", mddev->level);
2450 level_store(mddev_t *mddev, const char *buf, size_t len)
2457 if (len >= sizeof(mddev->clevel))
2459 strncpy(mddev->clevel, buf, len);
2460 if (mddev->clevel[len-1] == '\n')
2462 mddev->clevel[len] = 0;
2463 mddev->level = LEVEL_NONE;
2467 static struct md_sysfs_entry md_level =
2468 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2472 layout_show(mddev_t *mddev, char *page)
2474 /* just a number, not meaningful for all levels */
2475 if (mddev->reshape_position != MaxSector &&
2476 mddev->layout != mddev->new_layout)
2477 return sprintf(page, "%d (%d)\n",
2478 mddev->new_layout, mddev->layout);
2479 return sprintf(page, "%d\n", mddev->layout);
2483 layout_store(mddev_t *mddev, const char *buf, size_t len)
2486 unsigned long n = simple_strtoul(buf, &e, 10);
2488 if (!*buf || (*e && *e != '\n'))
2493 if (mddev->reshape_position != MaxSector)
2494 mddev->new_layout = n;
2499 static struct md_sysfs_entry md_layout =
2500 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2504 raid_disks_show(mddev_t *mddev, char *page)
2506 if (mddev->raid_disks == 0)
2508 if (mddev->reshape_position != MaxSector &&
2509 mddev->delta_disks != 0)
2510 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2511 mddev->raid_disks - mddev->delta_disks);
2512 return sprintf(page, "%d\n", mddev->raid_disks);
2515 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2518 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2522 unsigned long n = simple_strtoul(buf, &e, 10);
2524 if (!*buf || (*e && *e != '\n'))
2528 rv = update_raid_disks(mddev, n);
2529 else if (mddev->reshape_position != MaxSector) {
2530 int olddisks = mddev->raid_disks - mddev->delta_disks;
2531 mddev->delta_disks = n - olddisks;
2532 mddev->raid_disks = n;
2534 mddev->raid_disks = n;
2535 return rv ? rv : len;
2537 static struct md_sysfs_entry md_raid_disks =
2538 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2541 chunk_size_show(mddev_t *mddev, char *page)
2543 if (mddev->reshape_position != MaxSector &&
2544 mddev->chunk_size != mddev->new_chunk)
2545 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2547 return sprintf(page, "%d\n", mddev->chunk_size);
2551 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2553 /* can only set chunk_size if array is not yet active */
2555 unsigned long n = simple_strtoul(buf, &e, 10);
2557 if (!*buf || (*e && *e != '\n'))
2562 else if (mddev->reshape_position != MaxSector)
2563 mddev->new_chunk = n;
2565 mddev->chunk_size = n;
2568 static struct md_sysfs_entry md_chunk_size =
2569 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2572 resync_start_show(mddev_t *mddev, char *page)
2574 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2578 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2581 unsigned long long n = simple_strtoull(buf, &e, 10);
2585 if (!*buf || (*e && *e != '\n'))
2588 mddev->recovery_cp = n;
2591 static struct md_sysfs_entry md_resync_start =
2592 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2595 * The array state can be:
2598 * No devices, no size, no level
2599 * Equivalent to STOP_ARRAY ioctl
2601 * May have some settings, but array is not active
2602 * all IO results in error
2603 * When written, doesn't tear down array, but just stops it
2604 * suspended (not supported yet)
2605 * All IO requests will block. The array can be reconfigured.
2606 * Writing this, if accepted, will block until array is quiescent
2608 * no resync can happen. no superblocks get written.
2609 * write requests fail
2611 * like readonly, but behaves like 'clean' on a write request.
2613 * clean - no pending writes, but otherwise active.
2614 * When written to inactive array, starts without resync
2615 * If a write request arrives then
2616 * if metadata is known, mark 'dirty' and switch to 'active'.
2617 * if not known, block and switch to write-pending
2618 * If written to an active array that has pending writes, then fails.
2620 * fully active: IO and resync can be happening.
2621 * When written to inactive array, starts with resync
2624 * clean, but writes are blocked waiting for 'active' to be written.
2627 * like active, but no writes have been seen for a while (100msec).
2630 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2631 write_pending, active_idle, bad_word};
2632 static char *array_states[] = {
2633 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2634 "write-pending", "active-idle", NULL };
2636 static int match_word(const char *word, char **list)
2639 for (n=0; list[n]; n++)
2640 if (cmd_match(word, list[n]))
2646 array_state_show(mddev_t *mddev, char *page)
2648 enum array_state st = inactive;
2661 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2663 else if (mddev->safemode)
2669 if (list_empty(&mddev->disks) &&
2670 mddev->raid_disks == 0 &&
2676 return sprintf(page, "%s\n", array_states[st]);
2679 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
2680 static int do_md_run(mddev_t * mddev);
2681 static int restart_array(mddev_t *mddev);
2684 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2687 enum array_state st = match_word(buf, array_states);
2692 /* stopping an active array */
2693 if (atomic_read(&mddev->openers) > 0)
2695 err = do_md_stop(mddev, 0, 0);
2698 /* stopping an active array */
2700 if (atomic_read(&mddev->openers) > 0)
2702 err = do_md_stop(mddev, 2, 0);
2704 err = 0; /* already inactive */
2707 break; /* not supported yet */
2710 err = do_md_stop(mddev, 1, 0);
2713 set_disk_ro(mddev->gendisk, 1);
2714 err = do_md_run(mddev);
2720 err = do_md_stop(mddev, 1, 0);
2721 else if (mddev->ro == 1)
2722 err = restart_array(mddev);
2725 set_disk_ro(mddev->gendisk, 0);
2729 err = do_md_run(mddev);
2734 restart_array(mddev);
2735 spin_lock_irq(&mddev->write_lock);
2736 if (atomic_read(&mddev->writes_pending) == 0) {
2737 if (mddev->in_sync == 0) {
2739 if (mddev->safemode == 1)
2740 mddev->safemode = 0;
2741 if (mddev->persistent)
2742 set_bit(MD_CHANGE_CLEAN,
2748 spin_unlock_irq(&mddev->write_lock);
2751 mddev->recovery_cp = MaxSector;
2752 err = do_md_run(mddev);
2757 restart_array(mddev);
2758 if (mddev->external)
2759 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2760 wake_up(&mddev->sb_wait);
2764 set_disk_ro(mddev->gendisk, 0);
2765 err = do_md_run(mddev);
2770 /* these cannot be set */
2776 sysfs_notify_dirent(mddev->sysfs_state);
2780 static struct md_sysfs_entry md_array_state =
2781 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2784 null_show(mddev_t *mddev, char *page)
2790 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2792 /* buf must be %d:%d\n? giving major and minor numbers */
2793 /* The new device is added to the array.
2794 * If the array has a persistent superblock, we read the
2795 * superblock to initialise info and check validity.
2796 * Otherwise, only checking done is that in bind_rdev_to_array,
2797 * which mainly checks size.
2800 int major = simple_strtoul(buf, &e, 10);
2806 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2808 minor = simple_strtoul(e+1, &e, 10);
2809 if (*e && *e != '\n')
2811 dev = MKDEV(major, minor);
2812 if (major != MAJOR(dev) ||
2813 minor != MINOR(dev))
2817 if (mddev->persistent) {
2818 rdev = md_import_device(dev, mddev->major_version,
2819 mddev->minor_version);
2820 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2821 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2822 mdk_rdev_t, same_set);
2823 err = super_types[mddev->major_version]
2824 .load_super(rdev, rdev0, mddev->minor_version);
2828 } else if (mddev->external)
2829 rdev = md_import_device(dev, -2, -1);
2831 rdev = md_import_device(dev, -1, -1);
2834 return PTR_ERR(rdev);
2835 err = bind_rdev_to_array(rdev, mddev);
2839 return err ? err : len;
2842 static struct md_sysfs_entry md_new_device =
2843 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2846 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2849 unsigned long chunk, end_chunk;
2853 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2855 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2856 if (buf == end) break;
2857 if (*end == '-') { /* range */
2859 end_chunk = simple_strtoul(buf, &end, 0);
2860 if (buf == end) break;
2862 if (*end && !isspace(*end)) break;
2863 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2865 while (isspace(*buf)) buf++;
2867 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2872 static struct md_sysfs_entry md_bitmap =
2873 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2876 size_show(mddev_t *mddev, char *page)
2878 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2881 static int update_size(mddev_t *mddev, sector_t num_sectors);
2884 size_store(mddev_t *mddev, const char *buf, size_t len)
2886 /* If array is inactive, we can reduce the component size, but
2887 * not increase it (except from 0).
2888 * If array is active, we can try an on-line resize
2892 unsigned long long size = simple_strtoull(buf, &e, 10);
2893 if (!*buf || *buf == '\n' ||
2898 err = update_size(mddev, size * 2);
2899 md_update_sb(mddev, 1);
2901 if (mddev->size == 0 ||
2907 return err ? err : len;
2910 static struct md_sysfs_entry md_size =
2911 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2916 * 'none' for arrays with no metadata (good luck...)
2917 * 'external' for arrays with externally managed metadata,
2918 * or N.M for internally known formats
2921 metadata_show(mddev_t *mddev, char *page)
2923 if (mddev->persistent)
2924 return sprintf(page, "%d.%d\n",
2925 mddev->major_version, mddev->minor_version);
2926 else if (mddev->external)
2927 return sprintf(page, "external:%s\n", mddev->metadata_type);
2929 return sprintf(page, "none\n");
2933 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2937 /* Changing the details of 'external' metadata is
2938 * always permitted. Otherwise there must be
2939 * no devices attached to the array.
2941 if (mddev->external && strncmp(buf, "external:", 9) == 0)
2943 else if (!list_empty(&mddev->disks))
2946 if (cmd_match(buf, "none")) {
2947 mddev->persistent = 0;
2948 mddev->external = 0;
2949 mddev->major_version = 0;
2950 mddev->minor_version = 90;
2953 if (strncmp(buf, "external:", 9) == 0) {
2954 size_t namelen = len-9;
2955 if (namelen >= sizeof(mddev->metadata_type))
2956 namelen = sizeof(mddev->metadata_type)-1;
2957 strncpy(mddev->metadata_type, buf+9, namelen);
2958 mddev->metadata_type[namelen] = 0;
2959 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2960 mddev->metadata_type[--namelen] = 0;
2961 mddev->persistent = 0;
2962 mddev->external = 1;
2963 mddev->major_version = 0;
2964 mddev->minor_version = 90;
2967 major = simple_strtoul(buf, &e, 10);
2968 if (e==buf || *e != '.')
2971 minor = simple_strtoul(buf, &e, 10);
2972 if (e==buf || (*e && *e != '\n') )
2974 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
2976 mddev->major_version = major;
2977 mddev->minor_version = minor;
2978 mddev->persistent = 1;
2979 mddev->external = 0;
2983 static struct md_sysfs_entry md_metadata =
2984 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
2987 action_show(mddev_t *mddev, char *page)
2989 char *type = "idle";
2990 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2991 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
2992 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2994 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2995 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2997 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3001 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3004 return sprintf(page, "%s\n", type);
3008 action_store(mddev_t *mddev, const char *page, size_t len)
3010 if (!mddev->pers || !mddev->pers->sync_request)
3013 if (cmd_match(page, "idle")) {
3014 if (mddev->sync_thread) {
3015 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3016 md_unregister_thread(mddev->sync_thread);
3017 mddev->sync_thread = NULL;
3018 mddev->recovery = 0;
3020 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3021 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3023 else if (cmd_match(page, "resync"))
3024 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3025 else if (cmd_match(page, "recover")) {
3026 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3027 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3028 } else if (cmd_match(page, "reshape")) {
3030 if (mddev->pers->start_reshape == NULL)
3032 err = mddev->pers->start_reshape(mddev);
3035 sysfs_notify(&mddev->kobj, NULL, "degraded");
3037 if (cmd_match(page, "check"))
3038 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3039 else if (!cmd_match(page, "repair"))
3041 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3042 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3044 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3045 md_wakeup_thread(mddev->thread);
3046 sysfs_notify(&mddev->kobj, NULL, "sync_action");
3051 mismatch_cnt_show(mddev_t *mddev, char *page)
3053 return sprintf(page, "%llu\n",
3054 (unsigned long long) mddev->resync_mismatches);
3057 static struct md_sysfs_entry md_scan_mode =
3058 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3061 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3064 sync_min_show(mddev_t *mddev, char *page)
3066 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3067 mddev->sync_speed_min ? "local": "system");
3071 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3075 if (strncmp(buf, "system", 6)==0) {
3076 mddev->sync_speed_min = 0;
3079 min = simple_strtoul(buf, &e, 10);
3080 if (buf == e || (*e && *e != '\n') || min <= 0)
3082 mddev->sync_speed_min = min;
3086 static struct md_sysfs_entry md_sync_min =
3087 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3090 sync_max_show(mddev_t *mddev, char *page)
3092 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3093 mddev->sync_speed_max ? "local": "system");
3097 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3101 if (strncmp(buf, "system", 6)==0) {
3102 mddev->sync_speed_max = 0;
3105 max = simple_strtoul(buf, &e, 10);
3106 if (buf == e || (*e && *e != '\n') || max <= 0)
3108 mddev->sync_speed_max = max;
3112 static struct md_sysfs_entry md_sync_max =
3113 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3116 degraded_show(mddev_t *mddev, char *page)
3118 return sprintf(page, "%d\n", mddev->degraded);
3120 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3123 sync_force_parallel_show(mddev_t *mddev, char *page)
3125 return sprintf(page, "%d\n", mddev->parallel_resync);
3129 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3133 if (strict_strtol(buf, 10, &n))
3136 if (n != 0 && n != 1)
3139 mddev->parallel_resync = n;
3141 if (mddev->sync_thread)
3142 wake_up(&resync_wait);
3147 /* force parallel resync, even with shared block devices */
3148 static struct md_sysfs_entry md_sync_force_parallel =
3149 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3150 sync_force_parallel_show, sync_force_parallel_store);
3153 sync_speed_show(mddev_t *mddev, char *page)
3155 unsigned long resync, dt, db;
3156 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3157 dt = (jiffies - mddev->resync_mark) / HZ;
3159 db = resync - mddev->resync_mark_cnt;
3160 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3163 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3166 sync_completed_show(mddev_t *mddev, char *page)
3168 unsigned long max_blocks, resync;
3170 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3171 max_blocks = mddev->resync_max_sectors;
3173 max_blocks = mddev->size << 1;
3175 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3176 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3179 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3182 min_sync_show(mddev_t *mddev, char *page)
3184 return sprintf(page, "%llu\n",
3185 (unsigned long long)mddev->resync_min);
3188 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3190 unsigned long long min;
3191 if (strict_strtoull(buf, 10, &min))
3193 if (min > mddev->resync_max)
3195 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3198 /* Must be a multiple of chunk_size */
3199 if (mddev->chunk_size) {
3200 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3203 mddev->resync_min = min;
3208 static struct md_sysfs_entry md_min_sync =
3209 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3212 max_sync_show(mddev_t *mddev, char *page)
3214 if (mddev->resync_max == MaxSector)
3215 return sprintf(page, "max\n");
3217 return sprintf(page, "%llu\n",
3218 (unsigned long long)mddev->resync_max);
3221 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3223 if (strncmp(buf, "max", 3) == 0)
3224 mddev->resync_max = MaxSector;
3226 unsigned long long max;
3227 if (strict_strtoull(buf, 10, &max))
3229 if (max < mddev->resync_min)
3231 if (max < mddev->resync_max &&
3232 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3235 /* Must be a multiple of chunk_size */
3236 if (mddev->chunk_size) {
3237 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3240 mddev->resync_max = max;
3242 wake_up(&mddev->recovery_wait);
3246 static struct md_sysfs_entry md_max_sync =
3247 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3250 suspend_lo_show(mddev_t *mddev, char *page)
3252 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3256 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3259 unsigned long long new = simple_strtoull(buf, &e, 10);
3261 if (mddev->pers->quiesce == NULL)
3263 if (buf == e || (*e && *e != '\n'))
3265 if (new >= mddev->suspend_hi ||
3266 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3267 mddev->suspend_lo = new;
3268 mddev->pers->quiesce(mddev, 2);
3273 static struct md_sysfs_entry md_suspend_lo =
3274 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3278 suspend_hi_show(mddev_t *mddev, char *page)
3280 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3284 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3287 unsigned long long new = simple_strtoull(buf, &e, 10);
3289 if (mddev->pers->quiesce == NULL)
3291 if (buf == e || (*e && *e != '\n'))
3293 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3294 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3295 mddev->suspend_hi = new;
3296 mddev->pers->quiesce(mddev, 1);
3297 mddev->pers->quiesce(mddev, 0);
3302 static struct md_sysfs_entry md_suspend_hi =
3303 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3306 reshape_position_show(mddev_t *mddev, char *page)
3308 if (mddev->reshape_position != MaxSector)
3309 return sprintf(page, "%llu\n",
3310 (unsigned long long)mddev->reshape_position);
3311 strcpy(page, "none\n");
3316 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3319 unsigned long long new = simple_strtoull(buf, &e, 10);
3322 if (buf == e || (*e && *e != '\n'))
3324 mddev->reshape_position = new;
3325 mddev->delta_disks = 0;
3326 mddev->new_level = mddev->level;
3327 mddev->new_layout = mddev->layout;
3328 mddev->new_chunk = mddev->chunk_size;
3332 static struct md_sysfs_entry md_reshape_position =
3333 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3334 reshape_position_store);
3337 static struct attribute *md_default_attrs[] = {
3340 &md_raid_disks.attr,
3341 &md_chunk_size.attr,
3343 &md_resync_start.attr,
3345 &md_new_device.attr,
3346 &md_safe_delay.attr,
3347 &md_array_state.attr,
3348 &md_reshape_position.attr,
3352 static struct attribute *md_redundancy_attrs[] = {
3354 &md_mismatches.attr,
3357 &md_sync_speed.attr,
3358 &md_sync_force_parallel.attr,
3359 &md_sync_completed.attr,
3362 &md_suspend_lo.attr,
3363 &md_suspend_hi.attr,
3368 static struct attribute_group md_redundancy_group = {
3370 .attrs = md_redundancy_attrs,
3375 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3377 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3378 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3383 rv = mddev_lock(mddev);
3385 rv = entry->show(mddev, page);
3386 mddev_unlock(mddev);
3392 md_attr_store(struct kobject *kobj, struct attribute *attr,
3393 const char *page, size_t length)
3395 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3396 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3401 if (!capable(CAP_SYS_ADMIN))
3403 rv = mddev_lock(mddev);
3405 rv = entry->store(mddev, page, length);
3406 mddev_unlock(mddev);
3411 static void md_free(struct kobject *ko)
3413 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3417 static struct sysfs_ops md_sysfs_ops = {
3418 .show = md_attr_show,
3419 .store = md_attr_store,
3421 static struct kobj_type md_ktype = {
3423 .sysfs_ops = &md_sysfs_ops,
3424 .default_attrs = md_default_attrs,
3429 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3431 static DEFINE_MUTEX(disks_mutex);
3432 mddev_t *mddev = mddev_find(dev);
3433 struct gendisk *disk;
3434 int partitioned = (MAJOR(dev) != MD_MAJOR);
3435 int shift = partitioned ? MdpMinorShift : 0;
3436 int unit = MINOR(dev) >> shift;
3442 mutex_lock(&disks_mutex);
3443 if (mddev->gendisk) {
3444 mutex_unlock(&disks_mutex);
3448 disk = alloc_disk(1 << shift);
3450 mutex_unlock(&disks_mutex);
3454 disk->major = MAJOR(dev);
3455 disk->first_minor = unit << shift;
3457 sprintf(disk->disk_name, "md_d%d", unit);
3459 sprintf(disk->disk_name, "md%d", unit);
3460 disk->fops = &md_fops;
3461 disk->private_data = mddev;
3462 disk->queue = mddev->queue;
3464 mddev->gendisk = disk;
3465 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3466 &disk_to_dev(disk)->kobj, "%s", "md");
3467 mutex_unlock(&disks_mutex);
3469 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3472 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3473 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
3478 static void md_safemode_timeout(unsigned long data)
3480 mddev_t *mddev = (mddev_t *) data;
3482 if (!atomic_read(&mddev->writes_pending)) {
3483 mddev->safemode = 1;
3484 if (mddev->external)
3485 sysfs_notify_dirent(mddev->sysfs_state);
3487 md_wakeup_thread(mddev->thread);
3490 static int start_dirty_degraded;
3492 static int do_md_run(mddev_t * mddev)
3496 struct list_head *tmp;
3498 struct gendisk *disk;
3499 struct mdk_personality *pers;
3500 char b[BDEVNAME_SIZE];
3502 if (list_empty(&mddev->disks))
3503 /* cannot run an array with no devices.. */
3510 * Analyze all RAID superblock(s)
3512 if (!mddev->raid_disks) {
3513 if (!mddev->persistent)
3518 chunk_size = mddev->chunk_size;
3521 if (chunk_size > MAX_CHUNK_SIZE) {
3522 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3523 chunk_size, MAX_CHUNK_SIZE);
3527 * chunk-size has to be a power of 2
3529 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3530 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3534 /* devices must have minimum size of one chunk */
3535 rdev_for_each(rdev, tmp, mddev) {
3536 if (test_bit(Faulty, &rdev->flags))
3538 if (rdev->size < chunk_size / 1024) {
3540 "md: Dev %s smaller than chunk_size:"
3542 bdevname(rdev->bdev,b),
3543 (unsigned long long)rdev->size,
3550 if (mddev->level != LEVEL_NONE)
3551 request_module("md-level-%d", mddev->level);
3552 else if (mddev->clevel[0])
3553 request_module("md-%s", mddev->clevel);
3556 * Drop all container device buffers, from now on
3557 * the only valid external interface is through the md
3560 rdev_for_each(rdev, tmp, mddev) {
3561 if (test_bit(Faulty, &rdev->flags))
3563 sync_blockdev(rdev->bdev);
3564 invalidate_bdev(rdev->bdev);
3566 /* perform some consistency tests on the device.
3567 * We don't want the data to overlap the metadata,
3568 * Internal Bitmap issues has handled elsewhere.
3570 if (rdev->data_offset < rdev->sb_start) {
3572 rdev->data_offset + mddev->size*2
3574 printk("md: %s: data overlaps metadata\n",
3579 if (rdev->sb_start + rdev->sb_size/512
3580 > rdev->data_offset) {
3581 printk("md: %s: metadata overlaps data\n",
3586 sysfs_notify(&rdev->kobj, NULL, "state");
3589 md_probe(mddev->unit, NULL, NULL);
3590 disk = mddev->gendisk;
3594 spin_lock(&pers_lock);
3595 pers = find_pers(mddev->level, mddev->clevel);
3596 if (!pers || !try_module_get(pers->owner)) {
3597 spin_unlock(&pers_lock);
3598 if (mddev->level != LEVEL_NONE)
3599 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3602 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3607 spin_unlock(&pers_lock);
3608 mddev->level = pers->level;
3609 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3611 if (mddev->reshape_position != MaxSector &&
3612 pers->start_reshape == NULL) {
3613 /* This personality cannot handle reshaping... */
3615 module_put(pers->owner);
3619 if (pers->sync_request) {
3620 /* Warn if this is a potentially silly
3623 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3625 struct list_head *tmp2;
3627 rdev_for_each(rdev, tmp, mddev) {
3628 rdev_for_each(rdev2, tmp2, mddev) {
3630 rdev->bdev->bd_contains ==
3631 rdev2->bdev->bd_contains) {
3633 "%s: WARNING: %s appears to be"
3634 " on the same physical disk as"
3637 bdevname(rdev->bdev,b),
3638 bdevname(rdev2->bdev,b2));
3645 "True protection against single-disk"
3646 " failure might be compromised.\n");
3649 mddev->recovery = 0;
3650 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3651 mddev->barriers_work = 1;
3652 mddev->ok_start_degraded = start_dirty_degraded;
3655 mddev->ro = 2; /* read-only, but switch on first write */
3657 err = mddev->pers->run(mddev);
3659 printk(KERN_ERR "md: pers->run() failed ...\n");
3660 else if (mddev->pers->sync_request) {
3661 err = bitmap_create(mddev);
3663 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3664 mdname(mddev), err);
3665 mddev->pers->stop(mddev);
3669 module_put(mddev->pers->owner);
3671 bitmap_destroy(mddev);
3674 if (mddev->pers->sync_request) {
3675 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3677 "md: cannot register extra attributes for %s\n",
3679 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3682 atomic_set(&mddev->writes_pending,0);
3683 mddev->safemode = 0;
3684 mddev->safemode_timer.function = md_safemode_timeout;
3685 mddev->safemode_timer.data = (unsigned long) mddev;
3686 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3689 rdev_for_each(rdev, tmp, mddev)
3690 if (rdev->raid_disk >= 0) {
3692 sprintf(nm, "rd%d", rdev->raid_disk);
3693 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3694 printk("md: cannot register %s for %s\n",
3698 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3701 md_update_sb(mddev, 0);
3703 set_capacity(disk, mddev->array_sectors);
3705 /* If we call blk_queue_make_request here, it will
3706 * re-initialise max_sectors etc which may have been
3707 * refined inside -> run. So just set the bits we need to set.
3708 * Most initialisation happended when we called
3709 * blk_queue_make_request(..., md_fail_request)
3712 mddev->queue->queuedata = mddev;
3713 mddev->queue->make_request_fn = mddev->pers->make_request;
3715 /* If there is a partially-recovered drive we need to
3716 * start recovery here. If we leave it to md_check_recovery,
3717 * it will remove the drives and not do the right thing
3719 if (mddev->degraded && !mddev->sync_thread) {
3720 struct list_head *rtmp;
3722 rdev_for_each(rdev, rtmp, mddev)
3723 if (rdev->raid_disk >= 0 &&
3724 !test_bit(In_sync, &rdev->flags) &&
3725 !test_bit(Faulty, &rdev->flags))
3726 /* complete an interrupted recovery */
3728 if (spares && mddev->pers->sync_request) {
3729 mddev->recovery = 0;
3730 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3731 mddev->sync_thread = md_register_thread(md_do_sync,
3734 if (!mddev->sync_thread) {
3735 printk(KERN_ERR "%s: could not start resync"
3738 /* leave the spares where they are, it shouldn't hurt */
3739 mddev->recovery = 0;
3743 md_wakeup_thread(mddev->thread);
3744 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3747 md_new_event(mddev);
3748 sysfs_notify_dirent(mddev->sysfs_state);
3749 sysfs_notify(&mddev->kobj, NULL, "sync_action");
3750 sysfs_notify(&mddev->kobj, NULL, "degraded");
3751 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
3755 static int restart_array(mddev_t *mddev)
3757 struct gendisk *disk = mddev->gendisk;
3759 /* Complain if it has no devices */
3760 if (list_empty(&mddev->disks))
3766 mddev->safemode = 0;
3768 set_disk_ro(disk, 0);
3769 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3771 /* Kick recovery or resync if necessary */
3772 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3773 md_wakeup_thread(mddev->thread);
3774 md_wakeup_thread(mddev->sync_thread);
3775 sysfs_notify_dirent(mddev->sysfs_state);
3779 /* similar to deny_write_access, but accounts for our holding a reference
3780 * to the file ourselves */
3781 static int deny_bitmap_write_access(struct file * file)
3783 struct inode *inode = file->f_mapping->host;
3785 spin_lock(&inode->i_lock);
3786 if (atomic_read(&inode->i_writecount) > 1) {
3787 spin_unlock(&inode->i_lock);
3790 atomic_set(&inode->i_writecount, -1);
3791 spin_unlock(&inode->i_lock);
3796 static void restore_bitmap_write_access(struct file *file)
3798 struct inode *inode = file->f_mapping->host;
3800 spin_lock(&inode->i_lock);
3801 atomic_set(&inode->i_writecount, 1);
3802 spin_unlock(&inode->i_lock);
3806 * 0 - completely stop and dis-assemble array
3807 * 1 - switch to readonly
3808 * 2 - stop but do not disassemble array
3810 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
3813 struct gendisk *disk = mddev->gendisk;
3815 if (atomic_read(&mddev->openers) > is_open) {
3816 printk("md: %s still in use.\n",mdname(mddev));
3822 if (mddev->sync_thread) {
3823 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3824 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3825 md_unregister_thread(mddev->sync_thread);
3826 mddev->sync_thread = NULL;
3829 del_timer_sync(&mddev->safemode_timer);
3832 case 1: /* readonly */
3838 case 0: /* disassemble */
3840 bitmap_flush(mddev);
3841 md_super_wait(mddev);
3843 set_disk_ro(disk, 0);
3844 blk_queue_make_request(mddev->queue, md_fail_request);
3845 mddev->pers->stop(mddev);
3846 mddev->queue->merge_bvec_fn = NULL;
3847 mddev->queue->unplug_fn = NULL;
3848 mddev->queue->backing_dev_info.congested_fn = NULL;
3849 if (mddev->pers->sync_request)
3850 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3852 module_put(mddev->pers->owner);
3854 /* tell userspace to handle 'inactive' */
3855 sysfs_notify_dirent(mddev->sysfs_state);
3857 set_capacity(disk, 0);
3863 if (!mddev->in_sync || mddev->flags) {
3864 /* mark array as shutdown cleanly */
3866 md_update_sb(mddev, 1);
3869 set_disk_ro(disk, 1);
3870 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3874 * Free resources if final stop
3878 struct list_head *tmp;
3880 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3882 bitmap_destroy(mddev);
3883 if (mddev->bitmap_file) {
3884 restore_bitmap_write_access(mddev->bitmap_file);
3885 fput(mddev->bitmap_file);
3886 mddev->bitmap_file = NULL;
3888 mddev->bitmap_offset = 0;
3890 rdev_for_each(rdev, tmp, mddev)
3891 if (rdev->raid_disk >= 0) {
3893 sprintf(nm, "rd%d", rdev->raid_disk);
3894 sysfs_remove_link(&mddev->kobj, nm);
3897 /* make sure all md_delayed_delete calls have finished */
3898 flush_scheduled_work();
3900 export_array(mddev);
3902 mddev->array_sectors = 0;
3904 mddev->raid_disks = 0;
3905 mddev->recovery_cp = 0;
3906 mddev->resync_min = 0;
3907 mddev->resync_max = MaxSector;
3908 mddev->reshape_position = MaxSector;
3909 mddev->external = 0;
3910 mddev->persistent = 0;
3911 mddev->level = LEVEL_NONE;
3912 mddev->clevel[0] = 0;
3915 mddev->metadata_type[0] = 0;
3916 mddev->chunk_size = 0;
3917 mddev->ctime = mddev->utime = 0;
3919 mddev->max_disks = 0;
3921 mddev->delta_disks = 0;
3922 mddev->new_level = LEVEL_NONE;
3923 mddev->new_layout = 0;
3924 mddev->new_chunk = 0;
3925 mddev->curr_resync = 0;
3926 mddev->resync_mismatches = 0;
3927 mddev->suspend_lo = mddev->suspend_hi = 0;
3928 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3929 mddev->recovery = 0;
3932 mddev->degraded = 0;
3933 mddev->barriers_work = 0;
3934 mddev->safemode = 0;
3936 } else if (mddev->pers)
3937 printk(KERN_INFO "md: %s switched to read-only mode.\n",
3940 md_new_event(mddev);
3941 sysfs_notify_dirent(mddev->sysfs_state);
3947 static void autorun_array(mddev_t *mddev)
3950 struct list_head *tmp;
3953 if (list_empty(&mddev->disks))
3956 printk(KERN_INFO "md: running: ");
3958 rdev_for_each(rdev, tmp, mddev) {
3959 char b[BDEVNAME_SIZE];
3960 printk("<%s>", bdevname(rdev->bdev,b));
3964 err = do_md_run(mddev);
3966 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3967 do_md_stop(mddev, 0, 0);
3972 * lets try to run arrays based on all disks that have arrived
3973 * until now. (those are in pending_raid_disks)
3975 * the method: pick the first pending disk, collect all disks with
3976 * the same UUID, remove all from the pending list and put them into
3977 * the 'same_array' list. Then order this list based on superblock
3978 * update time (freshest comes first), kick out 'old' disks and
3979 * compare superblocks. If everything's fine then run it.
3981 * If "unit" is allocated, then bump its reference count
3983 static void autorun_devices(int part)
3985 struct list_head *tmp;
3986 mdk_rdev_t *rdev0, *rdev;
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;
4087 struct list_head *tmp;
4089 nr=working=active=failed=spare=0;
4090 rdev_for_each(rdev, tmp, mddev) {
4092 if (test_bit(Faulty, &rdev->flags))
4096 if (test_bit(In_sync, &rdev->flags))
4103 info.major_version = mddev->major_version;
4104 info.minor_version = mddev->minor_version;
4105 info.patch_version = MD_PATCHLEVEL_VERSION;
4106 info.ctime = mddev->ctime;
4107 info.level = mddev->level;
4108 info.size = mddev->size;
4109 if (info.size != mddev->size) /* overflow */
4112 info.raid_disks = mddev->raid_disks;
4113 info.md_minor = mddev->md_minor;
4114 info.not_persistent= !mddev->persistent;
4116 info.utime = mddev->utime;
4119 info.state = (1<<MD_SB_CLEAN);
4120 if (mddev->bitmap && mddev->bitmap_offset)
4121 info.state = (1<<MD_SB_BITMAP_PRESENT);
4122 info.active_disks = active;
4123 info.working_disks = working;
4124 info.failed_disks = failed;
4125 info.spare_disks = spare;
4127 info.layout = mddev->layout;
4128 info.chunk_size = mddev->chunk_size;
4130 if (copy_to_user(arg, &info, sizeof(info)))
4136 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4138 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4139 char *ptr, *buf = NULL;
4142 if (md_allow_write(mddev))
4143 file = kmalloc(sizeof(*file), GFP_NOIO);
4145 file = kmalloc(sizeof(*file), GFP_KERNEL);
4150 /* bitmap disabled, zero the first byte and copy out */
4151 if (!mddev->bitmap || !mddev->bitmap->file) {
4152 file->pathname[0] = '\0';
4156 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4160 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4164 strcpy(file->pathname, ptr);
4168 if (copy_to_user(arg, file, sizeof(*file)))
4176 static int get_disk_info(mddev_t * mddev, void __user * arg)
4178 mdu_disk_info_t info;
4181 if (copy_from_user(&info, arg, sizeof(info)))
4184 rdev = find_rdev_nr(mddev, info.number);
4186 info.major = MAJOR(rdev->bdev->bd_dev);
4187 info.minor = MINOR(rdev->bdev->bd_dev);
4188 info.raid_disk = rdev->raid_disk;
4190 if (test_bit(Faulty, &rdev->flags))
4191 info.state |= (1<<MD_DISK_FAULTY);
4192 else if (test_bit(In_sync, &rdev->flags)) {
4193 info.state |= (1<<MD_DISK_ACTIVE);
4194 info.state |= (1<<MD_DISK_SYNC);
4196 if (test_bit(WriteMostly, &rdev->flags))
4197 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4199 info.major = info.minor = 0;
4200 info.raid_disk = -1;
4201 info.state = (1<<MD_DISK_REMOVED);
4204 if (copy_to_user(arg, &info, sizeof(info)))
4210 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4212 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4214 dev_t dev = MKDEV(info->major,info->minor);
4216 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4219 if (!mddev->raid_disks) {
4221 /* expecting a device which has a superblock */
4222 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4225 "md: md_import_device returned %ld\n",
4227 return PTR_ERR(rdev);
4229 if (!list_empty(&mddev->disks)) {
4230 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4231 mdk_rdev_t, same_set);
4232 int err = super_types[mddev->major_version]
4233 .load_super(rdev, rdev0, mddev->minor_version);
4236 "md: %s has different UUID to %s\n",
4237 bdevname(rdev->bdev,b),
4238 bdevname(rdev0->bdev,b2));
4243 err = bind_rdev_to_array(rdev, mddev);
4250 * add_new_disk can be used once the array is assembled
4251 * to add "hot spares". They must already have a superblock
4256 if (!mddev->pers->hot_add_disk) {
4258 "%s: personality does not support diskops!\n",
4262 if (mddev->persistent)
4263 rdev = md_import_device(dev, mddev->major_version,
4264 mddev->minor_version);
4266 rdev = md_import_device(dev, -1, -1);
4269 "md: md_import_device returned %ld\n",
4271 return PTR_ERR(rdev);
4273 /* set save_raid_disk if appropriate */
4274 if (!mddev->persistent) {
4275 if (info->state & (1<<MD_DISK_SYNC) &&
4276 info->raid_disk < mddev->raid_disks)
4277 rdev->raid_disk = info->raid_disk;
4279 rdev->raid_disk = -1;
4281 super_types[mddev->major_version].
4282 validate_super(mddev, rdev);
4283 rdev->saved_raid_disk = rdev->raid_disk;
4285 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4286 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4287 set_bit(WriteMostly, &rdev->flags);
4289 rdev->raid_disk = -1;
4290 err = bind_rdev_to_array(rdev, mddev);
4291 if (!err && !mddev->pers->hot_remove_disk) {
4292 /* If there is hot_add_disk but no hot_remove_disk
4293 * then added disks for geometry changes,
4294 * and should be added immediately.
4296 super_types[mddev->major_version].
4297 validate_super(mddev, rdev);
4298 err = mddev->pers->hot_add_disk(mddev, rdev);
4300 unbind_rdev_from_array(rdev);
4305 sysfs_notify(&rdev->kobj, NULL, "state");
4307 md_update_sb(mddev, 1);
4308 if (mddev->degraded)
4309 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4310 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4311 md_wakeup_thread(mddev->thread);
4315 /* otherwise, add_new_disk is only allowed
4316 * for major_version==0 superblocks
4318 if (mddev->major_version != 0) {
4319 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4324 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4326 rdev = md_import_device(dev, -1, 0);
4329 "md: error, md_import_device() returned %ld\n",
4331 return PTR_ERR(rdev);
4333 rdev->desc_nr = info->number;
4334 if (info->raid_disk < mddev->raid_disks)
4335 rdev->raid_disk = info->raid_disk;
4337 rdev->raid_disk = -1;
4339 if (rdev->raid_disk < mddev->raid_disks)
4340 if (info->state & (1<<MD_DISK_SYNC))
4341 set_bit(In_sync, &rdev->flags);
4343 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4344 set_bit(WriteMostly, &rdev->flags);
4346 if (!mddev->persistent) {
4347 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4348 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4350 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4351 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4353 err = bind_rdev_to_array(rdev, mddev);
4363 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4365 char b[BDEVNAME_SIZE];
4368 rdev = find_rdev(mddev, dev);
4372 if (rdev->raid_disk >= 0)
4375 kick_rdev_from_array(rdev);
4376 md_update_sb(mddev, 1);
4377 md_new_event(mddev);
4381 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4382 bdevname(rdev->bdev,b), mdname(mddev));
4386 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4388 char b[BDEVNAME_SIZE];
4395 if (mddev->major_version != 0) {
4396 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4397 " version-0 superblocks.\n",
4401 if (!mddev->pers->hot_add_disk) {
4403 "%s: personality does not support diskops!\n",
4408 rdev = md_import_device(dev, -1, 0);
4411 "md: error, md_import_device() returned %ld\n",
4416 if (mddev->persistent)
4417 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4419 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4421 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4423 if (test_bit(Faulty, &rdev->flags)) {
4425 "md: can not hot-add faulty %s disk to %s!\n",
4426 bdevname(rdev->bdev,b), mdname(mddev));
4430 clear_bit(In_sync, &rdev->flags);
4432 rdev->saved_raid_disk = -1;
4433 err = bind_rdev_to_array(rdev, mddev);
4438 * The rest should better be atomic, we can have disk failures
4439 * noticed in interrupt contexts ...
4442 if (rdev->desc_nr == mddev->max_disks) {
4443 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4446 goto abort_unbind_export;
4449 rdev->raid_disk = -1;
4451 md_update_sb(mddev, 1);
4454 * Kick recovery, maybe this spare has to be added to the
4455 * array immediately.
4457 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4458 md_wakeup_thread(mddev->thread);
4459 md_new_event(mddev);
4462 abort_unbind_export:
4463 unbind_rdev_from_array(rdev);
4470 static int set_bitmap_file(mddev_t *mddev, int fd)
4475 if (!mddev->pers->quiesce)
4477 if (mddev->recovery || mddev->sync_thread)
4479 /* we should be able to change the bitmap.. */
4485 return -EEXIST; /* cannot add when bitmap is present */
4486 mddev->bitmap_file = fget(fd);
4488 if (mddev->bitmap_file == NULL) {
4489 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4494 err = deny_bitmap_write_access(mddev->bitmap_file);
4496 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4498 fput(mddev->bitmap_file);
4499 mddev->bitmap_file = NULL;
4502 mddev->bitmap_offset = 0; /* file overrides offset */
4503 } else if (mddev->bitmap == NULL)
4504 return -ENOENT; /* cannot remove what isn't there */
4507 mddev->pers->quiesce(mddev, 1);
4509 err = bitmap_create(mddev);
4510 if (fd < 0 || err) {
4511 bitmap_destroy(mddev);
4512 fd = -1; /* make sure to put the file */
4514 mddev->pers->quiesce(mddev, 0);
4517 if (mddev->bitmap_file) {
4518 restore_bitmap_write_access(mddev->bitmap_file);
4519 fput(mddev->bitmap_file);
4521 mddev->bitmap_file = NULL;
4528 * set_array_info is used two different ways
4529 * The original usage is when creating a new array.
4530 * In this usage, raid_disks is > 0 and it together with
4531 * level, size, not_persistent,layout,chunksize determine the
4532 * shape of the array.
4533 * This will always create an array with a type-0.90.0 superblock.
4534 * The newer usage is when assembling an array.
4535 * In this case raid_disks will be 0, and the major_version field is
4536 * use to determine which style super-blocks are to be found on the devices.
4537 * The minor and patch _version numbers are also kept incase the
4538 * super_block handler wishes to interpret them.
4540 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4543 if (info->raid_disks == 0) {
4544 /* just setting version number for superblock loading */
4545 if (info->major_version < 0 ||
4546 info->major_version >= ARRAY_SIZE(super_types) ||
4547 super_types[info->major_version].name == NULL) {
4548 /* maybe try to auto-load a module? */
4550 "md: superblock version %d not known\n",
4551 info->major_version);
4554 mddev->major_version = info->major_version;
4555 mddev->minor_version = info->minor_version;
4556 mddev->patch_version = info->patch_version;
4557 mddev->persistent = !info->not_persistent;
4560 mddev->major_version = MD_MAJOR_VERSION;
4561 mddev->minor_version = MD_MINOR_VERSION;
4562 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4563 mddev->ctime = get_seconds();
4565 mddev->level = info->level;
4566 mddev->clevel[0] = 0;
4567 mddev->size = info->size;
4568 mddev->raid_disks = info->raid_disks;
4569 /* don't set md_minor, it is determined by which /dev/md* was
4572 if (info->state & (1<<MD_SB_CLEAN))
4573 mddev->recovery_cp = MaxSector;
4575 mddev->recovery_cp = 0;
4576 mddev->persistent = ! info->not_persistent;
4577 mddev->external = 0;
4579 mddev->layout = info->layout;
4580 mddev->chunk_size = info->chunk_size;
4582 mddev->max_disks = MD_SB_DISKS;
4584 if (mddev->persistent)
4586 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4588 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4589 mddev->bitmap_offset = 0;
4591 mddev->reshape_position = MaxSector;
4594 * Generate a 128 bit UUID
4596 get_random_bytes(mddev->uuid, 16);
4598 mddev->new_level = mddev->level;
4599 mddev->new_chunk = mddev->chunk_size;
4600 mddev->new_layout = mddev->layout;
4601 mddev->delta_disks = 0;
4606 static int update_size(mddev_t *mddev, sector_t num_sectors)
4610 struct list_head *tmp;
4611 int fit = (num_sectors == 0);
4613 if (mddev->pers->resize == NULL)
4615 /* The "num_sectors" is the number of sectors of each device that
4616 * is used. This can only make sense for arrays with redundancy.
4617 * linear and raid0 always use whatever space is available. We can only
4618 * consider changing this number if no resync or reconstruction is
4619 * happening, and if the new size is acceptable. It must fit before the
4620 * sb_start or, if that is <data_offset, it must fit before the size
4621 * of each device. If num_sectors is zero, we find the largest size
4625 if (mddev->sync_thread)
4628 /* Sorry, cannot grow a bitmap yet, just remove it,
4632 rdev_for_each(rdev, tmp, mddev) {
4634 avail = rdev->size * 2;
4636 if (fit && (num_sectors == 0 || num_sectors > avail))
4637 num_sectors = avail;
4638 if (avail < num_sectors)
4641 rv = mddev->pers->resize(mddev, num_sectors);
4643 struct block_device *bdev;
4645 bdev = bdget_disk(mddev->gendisk, 0);
4647 mutex_lock(&bdev->bd_inode->i_mutex);
4648 i_size_write(bdev->bd_inode,
4649 (loff_t)mddev->array_sectors << 9);
4650 mutex_unlock(&bdev->bd_inode->i_mutex);
4657 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4660 /* change the number of raid disks */
4661 if (mddev->pers->check_reshape == NULL)
4663 if (raid_disks <= 0 ||
4664 raid_disks >= mddev->max_disks)
4666 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4668 mddev->delta_disks = raid_disks - mddev->raid_disks;
4670 rv = mddev->pers->check_reshape(mddev);
4676 * update_array_info is used to change the configuration of an
4678 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4679 * fields in the info are checked against the array.
4680 * Any differences that cannot be handled will cause an error.
4681 * Normally, only one change can be managed at a time.
4683 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4689 /* calculate expected state,ignoring low bits */
4690 if (mddev->bitmap && mddev->bitmap_offset)
4691 state |= (1 << MD_SB_BITMAP_PRESENT);
4693 if (mddev->major_version != info->major_version ||
4694 mddev->minor_version != info->minor_version ||
4695 /* mddev->patch_version != info->patch_version || */
4696 mddev->ctime != info->ctime ||
4697 mddev->level != info->level ||
4698 /* mddev->layout != info->layout || */
4699 !mddev->persistent != info->not_persistent||
4700 mddev->chunk_size != info->chunk_size ||
4701 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4702 ((state^info->state) & 0xfffffe00)
4705 /* Check there is only one change */
4706 if (info->size >= 0 && mddev->size != info->size) cnt++;
4707 if (mddev->raid_disks != info->raid_disks) cnt++;
4708 if (mddev->layout != info->layout) cnt++;
4709 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4710 if (cnt == 0) return 0;
4711 if (cnt > 1) return -EINVAL;
4713 if (mddev->layout != info->layout) {
4715 * we don't need to do anything at the md level, the
4716 * personality will take care of it all.
4718 if (mddev->pers->reconfig == NULL)
4721 return mddev->pers->reconfig(mddev, info->layout, -1);
4723 if (info->size >= 0 && mddev->size != info->size)
4724 rv = update_size(mddev, (sector_t)info->size * 2);
4726 if (mddev->raid_disks != info->raid_disks)
4727 rv = update_raid_disks(mddev, info->raid_disks);
4729 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4730 if (mddev->pers->quiesce == NULL)
4732 if (mddev->recovery || mddev->sync_thread)
4734 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4735 /* add the bitmap */
4738 if (mddev->default_bitmap_offset == 0)
4740 mddev->bitmap_offset = mddev->default_bitmap_offset;
4741 mddev->pers->quiesce(mddev, 1);
4742 rv = bitmap_create(mddev);
4744 bitmap_destroy(mddev);
4745 mddev->pers->quiesce(mddev, 0);
4747 /* remove the bitmap */
4750 if (mddev->bitmap->file)
4752 mddev->pers->quiesce(mddev, 1);
4753 bitmap_destroy(mddev);
4754 mddev->pers->quiesce(mddev, 0);
4755 mddev->bitmap_offset = 0;
4758 md_update_sb(mddev, 1);
4762 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4766 if (mddev->pers == NULL)
4769 rdev = find_rdev(mddev, dev);
4773 md_error(mddev, rdev);
4778 * We have a problem here : there is no easy way to give a CHS
4779 * virtual geometry. We currently pretend that we have a 2 heads
4780 * 4 sectors (with a BIG number of cylinders...). This drives
4781 * dosfs just mad... ;-)
4783 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4785 mddev_t *mddev = bdev->bd_disk->private_data;
4789 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4793 static int md_ioctl(struct inode *inode, struct file *file,
4794 unsigned int cmd, unsigned long arg)
4797 void __user *argp = (void __user *)arg;
4798 mddev_t *mddev = NULL;
4800 if (!capable(CAP_SYS_ADMIN))
4804 * Commands dealing with the RAID driver but not any
4810 err = get_version(argp);
4813 case PRINT_RAID_DEBUG:
4821 autostart_arrays(arg);
4828 * Commands creating/starting a new array:
4831 mddev = inode->i_bdev->bd_disk->private_data;
4838 err = mddev_lock(mddev);
4841 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4848 case SET_ARRAY_INFO:
4850 mdu_array_info_t info;
4852 memset(&info, 0, sizeof(info));
4853 else if (copy_from_user(&info, argp, sizeof(info))) {
4858 err = update_array_info(mddev, &info);
4860 printk(KERN_WARNING "md: couldn't update"
4861 " array info. %d\n", err);
4866 if (!list_empty(&mddev->disks)) {
4868 "md: array %s already has disks!\n",
4873 if (mddev->raid_disks) {
4875 "md: array %s already initialised!\n",
4880 err = set_array_info(mddev, &info);
4882 printk(KERN_WARNING "md: couldn't set"
4883 " array info. %d\n", err);
4893 * Commands querying/configuring an existing array:
4895 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4896 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4897 if ((!mddev->raid_disks && !mddev->external)
4898 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4899 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4900 && cmd != GET_BITMAP_FILE) {
4906 * Commands even a read-only array can execute:
4910 case GET_ARRAY_INFO:
4911 err = get_array_info(mddev, argp);
4914 case GET_BITMAP_FILE:
4915 err = get_bitmap_file(mddev, argp);
4919 err = get_disk_info(mddev, argp);
4922 case RESTART_ARRAY_RW:
4923 err = restart_array(mddev);
4927 err = do_md_stop(mddev, 0, 1);
4931 err = do_md_stop(mddev, 1, 1);
4937 * The remaining ioctls are changing the state of the
4938 * superblock, so we do not allow them on read-only arrays.
4939 * However non-MD ioctls (e.g. get-size) will still come through
4940 * here and hit the 'default' below, so only disallow
4941 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4943 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
4944 if (mddev->ro == 2) {
4946 sysfs_notify_dirent(mddev->sysfs_state);
4947 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4948 md_wakeup_thread(mddev->thread);
4959 mdu_disk_info_t info;
4960 if (copy_from_user(&info, argp, sizeof(info)))
4963 err = add_new_disk(mddev, &info);
4967 case HOT_REMOVE_DISK:
4968 err = hot_remove_disk(mddev, new_decode_dev(arg));
4972 err = hot_add_disk(mddev, new_decode_dev(arg));
4975 case SET_DISK_FAULTY:
4976 err = set_disk_faulty(mddev, new_decode_dev(arg));
4980 err = do_md_run(mddev);
4983 case SET_BITMAP_FILE:
4984 err = set_bitmap_file(mddev, (int)arg);
4994 mddev_unlock(mddev);
5004 static int md_open(struct inode *inode, struct file *file)
5007 * Succeed if we can lock the mddev, which confirms that
5008 * it isn't being stopped right now.
5010 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
5013 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5018 atomic_inc(&mddev->openers);
5019 mddev_unlock(mddev);
5021 check_disk_change(inode->i_bdev);
5026 static int md_release(struct inode *inode, struct file * file)
5028 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
5031 atomic_dec(&mddev->openers);
5037 static int md_media_changed(struct gendisk *disk)
5039 mddev_t *mddev = disk->private_data;
5041 return mddev->changed;
5044 static int md_revalidate(struct gendisk *disk)
5046 mddev_t *mddev = disk->private_data;
5051 static struct block_device_operations md_fops =
5053 .owner = THIS_MODULE,
5055 .release = md_release,
5057 .getgeo = md_getgeo,
5058 .media_changed = md_media_changed,
5059 .revalidate_disk= md_revalidate,
5062 static int md_thread(void * arg)
5064 mdk_thread_t *thread = arg;
5067 * md_thread is a 'system-thread', it's priority should be very
5068 * high. We avoid resource deadlocks individually in each
5069 * raid personality. (RAID5 does preallocation) We also use RR and
5070 * the very same RT priority as kswapd, thus we will never get
5071 * into a priority inversion deadlock.
5073 * we definitely have to have equal or higher priority than
5074 * bdflush, otherwise bdflush will deadlock if there are too
5075 * many dirty RAID5 blocks.
5078 allow_signal(SIGKILL);
5079 while (!kthread_should_stop()) {
5081 /* We need to wait INTERRUPTIBLE so that
5082 * we don't add to the load-average.
5083 * That means we need to be sure no signals are
5086 if (signal_pending(current))
5087 flush_signals(current);
5089 wait_event_interruptible_timeout
5091 test_bit(THREAD_WAKEUP, &thread->flags)
5092 || kthread_should_stop(),
5095 clear_bit(THREAD_WAKEUP, &thread->flags);
5097 thread->run(thread->mddev);
5103 void md_wakeup_thread(mdk_thread_t *thread)
5106 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5107 set_bit(THREAD_WAKEUP, &thread->flags);
5108 wake_up(&thread->wqueue);
5112 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5115 mdk_thread_t *thread;
5117 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5121 init_waitqueue_head(&thread->wqueue);
5124 thread->mddev = mddev;
5125 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5126 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5127 if (IS_ERR(thread->tsk)) {
5134 void md_unregister_thread(mdk_thread_t *thread)
5136 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5138 kthread_stop(thread->tsk);
5142 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5149 if (!rdev || test_bit(Faulty, &rdev->flags))
5152 if (mddev->external)
5153 set_bit(Blocked, &rdev->flags);
5155 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5157 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5158 __builtin_return_address(0),__builtin_return_address(1),
5159 __builtin_return_address(2),__builtin_return_address(3));
5163 if (!mddev->pers->error_handler)
5165 mddev->pers->error_handler(mddev,rdev);
5166 if (mddev->degraded)
5167 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5168 set_bit(StateChanged, &rdev->flags);
5169 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5170 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5171 md_wakeup_thread(mddev->thread);
5172 md_new_event_inintr(mddev);
5175 /* seq_file implementation /proc/mdstat */
5177 static void status_unused(struct seq_file *seq)
5181 struct list_head *tmp;
5183 seq_printf(seq, "unused devices: ");
5185 rdev_for_each_list(rdev, tmp, pending_raid_disks) {
5186 char b[BDEVNAME_SIZE];
5188 seq_printf(seq, "%s ",
5189 bdevname(rdev->bdev,b));
5192 seq_printf(seq, "<none>");
5194 seq_printf(seq, "\n");
5198 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5200 sector_t max_blocks, resync, res;
5201 unsigned long dt, db, rt;
5203 unsigned int per_milli;
5205 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5207 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5208 max_blocks = mddev->resync_max_sectors >> 1;
5210 max_blocks = mddev->size;
5213 * Should not happen.
5219 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5220 * in a sector_t, and (max_blocks>>scale) will fit in a
5221 * u32, as those are the requirements for sector_div.
5222 * Thus 'scale' must be at least 10
5225 if (sizeof(sector_t) > sizeof(unsigned long)) {
5226 while ( max_blocks/2 > (1ULL<<(scale+32)))
5229 res = (resync>>scale)*1000;
5230 sector_div(res, (u32)((max_blocks>>scale)+1));
5234 int i, x = per_milli/50, y = 20-x;
5235 seq_printf(seq, "[");
5236 for (i = 0; i < x; i++)
5237 seq_printf(seq, "=");
5238 seq_printf(seq, ">");
5239 for (i = 0; i < y; i++)
5240 seq_printf(seq, ".");
5241 seq_printf(seq, "] ");
5243 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5244 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5246 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5248 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5249 "resync" : "recovery"))),
5250 per_milli/10, per_milli % 10,
5251 (unsigned long long) resync,
5252 (unsigned long long) max_blocks);
5255 * We do not want to overflow, so the order of operands and
5256 * the * 100 / 100 trick are important. We do a +1 to be
5257 * safe against division by zero. We only estimate anyway.
5259 * dt: time from mark until now
5260 * db: blocks written from mark until now
5261 * rt: remaining time
5263 dt = ((jiffies - mddev->resync_mark) / HZ);
5265 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5266 - mddev->resync_mark_cnt;
5267 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5269 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5271 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5274 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5276 struct list_head *tmp;
5286 spin_lock(&all_mddevs_lock);
5287 list_for_each(tmp,&all_mddevs)
5289 mddev = list_entry(tmp, mddev_t, all_mddevs);
5291 spin_unlock(&all_mddevs_lock);
5294 spin_unlock(&all_mddevs_lock);
5296 return (void*)2;/* tail */
5300 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5302 struct list_head *tmp;
5303 mddev_t *next_mddev, *mddev = v;
5309 spin_lock(&all_mddevs_lock);
5311 tmp = all_mddevs.next;
5313 tmp = mddev->all_mddevs.next;
5314 if (tmp != &all_mddevs)
5315 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5317 next_mddev = (void*)2;
5320 spin_unlock(&all_mddevs_lock);
5328 static void md_seq_stop(struct seq_file *seq, void *v)
5332 if (mddev && v != (void*)1 && v != (void*)2)
5336 struct mdstat_info {
5340 static int md_seq_show(struct seq_file *seq, void *v)
5344 struct list_head *tmp2;
5346 struct mdstat_info *mi = seq->private;
5347 struct bitmap *bitmap;
5349 if (v == (void*)1) {
5350 struct mdk_personality *pers;
5351 seq_printf(seq, "Personalities : ");
5352 spin_lock(&pers_lock);
5353 list_for_each_entry(pers, &pers_list, list)
5354 seq_printf(seq, "[%s] ", pers->name);
5356 spin_unlock(&pers_lock);
5357 seq_printf(seq, "\n");
5358 mi->event = atomic_read(&md_event_count);
5361 if (v == (void*)2) {
5366 if (mddev_lock(mddev) < 0)
5369 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5370 seq_printf(seq, "%s : %sactive", mdname(mddev),
5371 mddev->pers ? "" : "in");
5374 seq_printf(seq, " (read-only)");
5376 seq_printf(seq, " (auto-read-only)");
5377 seq_printf(seq, " %s", mddev->pers->name);
5381 rdev_for_each(rdev, tmp2, mddev) {
5382 char b[BDEVNAME_SIZE];
5383 seq_printf(seq, " %s[%d]",
5384 bdevname(rdev->bdev,b), rdev->desc_nr);
5385 if (test_bit(WriteMostly, &rdev->flags))
5386 seq_printf(seq, "(W)");
5387 if (test_bit(Faulty, &rdev->flags)) {
5388 seq_printf(seq, "(F)");
5390 } else if (rdev->raid_disk < 0)
5391 seq_printf(seq, "(S)"); /* spare */
5395 if (!list_empty(&mddev->disks)) {
5397 seq_printf(seq, "\n %llu blocks",
5398 (unsigned long long)
5399 mddev->array_sectors / 2);
5401 seq_printf(seq, "\n %llu blocks",
5402 (unsigned long long)size);
5404 if (mddev->persistent) {
5405 if (mddev->major_version != 0 ||
5406 mddev->minor_version != 90) {
5407 seq_printf(seq," super %d.%d",
5408 mddev->major_version,
5409 mddev->minor_version);
5411 } else if (mddev->external)
5412 seq_printf(seq, " super external:%s",
5413 mddev->metadata_type);
5415 seq_printf(seq, " super non-persistent");
5418 mddev->pers->status(seq, mddev);
5419 seq_printf(seq, "\n ");
5420 if (mddev->pers->sync_request) {
5421 if (mddev->curr_resync > 2) {
5422 status_resync(seq, mddev);
5423 seq_printf(seq, "\n ");
5424 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5425 seq_printf(seq, "\tresync=DELAYED\n ");
5426 else if (mddev->recovery_cp < MaxSector)
5427 seq_printf(seq, "\tresync=PENDING\n ");
5430 seq_printf(seq, "\n ");
5432 if ((bitmap = mddev->bitmap)) {
5433 unsigned long chunk_kb;
5434 unsigned long flags;
5435 spin_lock_irqsave(&bitmap->lock, flags);
5436 chunk_kb = bitmap->chunksize >> 10;
5437 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5439 bitmap->pages - bitmap->missing_pages,
5441 (bitmap->pages - bitmap->missing_pages)
5442 << (PAGE_SHIFT - 10),
5443 chunk_kb ? chunk_kb : bitmap->chunksize,
5444 chunk_kb ? "KB" : "B");
5446 seq_printf(seq, ", file: ");
5447 seq_path(seq, &bitmap->file->f_path, " \t\n");
5450 seq_printf(seq, "\n");
5451 spin_unlock_irqrestore(&bitmap->lock, flags);
5454 seq_printf(seq, "\n");
5456 mddev_unlock(mddev);
5461 static struct seq_operations md_seq_ops = {
5462 .start = md_seq_start,
5463 .next = md_seq_next,
5464 .stop = md_seq_stop,
5465 .show = md_seq_show,
5468 static int md_seq_open(struct inode *inode, struct file *file)
5471 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5475 error = seq_open(file, &md_seq_ops);
5479 struct seq_file *p = file->private_data;
5481 mi->event = atomic_read(&md_event_count);
5486 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5488 struct seq_file *m = filp->private_data;
5489 struct mdstat_info *mi = m->private;
5492 poll_wait(filp, &md_event_waiters, wait);
5494 /* always allow read */
5495 mask = POLLIN | POLLRDNORM;
5497 if (mi->event != atomic_read(&md_event_count))
5498 mask |= POLLERR | POLLPRI;
5502 static const struct file_operations md_seq_fops = {
5503 .owner = THIS_MODULE,
5504 .open = md_seq_open,
5506 .llseek = seq_lseek,
5507 .release = seq_release_private,
5508 .poll = mdstat_poll,
5511 int register_md_personality(struct mdk_personality *p)
5513 spin_lock(&pers_lock);
5514 list_add_tail(&p->list, &pers_list);
5515 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5516 spin_unlock(&pers_lock);
5520 int unregister_md_personality(struct mdk_personality *p)
5522 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5523 spin_lock(&pers_lock);
5524 list_del_init(&p->list);
5525 spin_unlock(&pers_lock);
5529 static int is_mddev_idle(mddev_t *mddev)
5537 rdev_for_each_rcu(rdev, mddev) {
5538 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5539 curr_events = part_stat_read(&disk->part0, sectors[0]) +
5540 part_stat_read(&disk->part0, sectors[1]) -
5541 atomic_read(&disk->sync_io);
5542 /* sync IO will cause sync_io to increase before the disk_stats
5543 * as sync_io is counted when a request starts, and
5544 * disk_stats is counted when it completes.
5545 * So resync activity will cause curr_events to be smaller than
5546 * when there was no such activity.
5547 * non-sync IO will cause disk_stat to increase without
5548 * increasing sync_io so curr_events will (eventually)
5549 * be larger than it was before. Once it becomes
5550 * substantially larger, the test below will cause
5551 * the array to appear non-idle, and resync will slow
5553 * If there is a lot of outstanding resync activity when
5554 * we set last_event to curr_events, then all that activity
5555 * completing might cause the array to appear non-idle
5556 * and resync will be slowed down even though there might
5557 * not have been non-resync activity. This will only
5558 * happen once though. 'last_events' will soon reflect
5559 * the state where there is little or no outstanding
5560 * resync requests, and further resync activity will
5561 * always make curr_events less than last_events.
5564 if (curr_events - rdev->last_events > 4096) {
5565 rdev->last_events = curr_events;
5573 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5575 /* another "blocks" (512byte) blocks have been synced */
5576 atomic_sub(blocks, &mddev->recovery_active);
5577 wake_up(&mddev->recovery_wait);
5579 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5580 md_wakeup_thread(mddev->thread);
5581 // stop recovery, signal do_sync ....
5586 /* md_write_start(mddev, bi)
5587 * If we need to update some array metadata (e.g. 'active' flag
5588 * in superblock) before writing, schedule a superblock update
5589 * and wait for it to complete.
5591 void md_write_start(mddev_t *mddev, struct bio *bi)
5594 if (bio_data_dir(bi) != WRITE)
5597 BUG_ON(mddev->ro == 1);
5598 if (mddev->ro == 2) {
5599 /* need to switch to read/write */
5601 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5602 md_wakeup_thread(mddev->thread);
5603 md_wakeup_thread(mddev->sync_thread);
5606 atomic_inc(&mddev->writes_pending);
5607 if (mddev->safemode == 1)
5608 mddev->safemode = 0;
5609 if (mddev->in_sync) {
5610 spin_lock_irq(&mddev->write_lock);
5611 if (mddev->in_sync) {
5613 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5614 md_wakeup_thread(mddev->thread);
5617 spin_unlock_irq(&mddev->write_lock);
5620 sysfs_notify_dirent(mddev->sysfs_state);
5621 wait_event(mddev->sb_wait,
5622 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5623 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5626 void md_write_end(mddev_t *mddev)
5628 if (atomic_dec_and_test(&mddev->writes_pending)) {
5629 if (mddev->safemode == 2)
5630 md_wakeup_thread(mddev->thread);
5631 else if (mddev->safemode_delay)
5632 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5636 /* md_allow_write(mddev)
5637 * Calling this ensures that the array is marked 'active' so that writes
5638 * may proceed without blocking. It is important to call this before
5639 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5640 * Must be called with mddev_lock held.
5642 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5643 * is dropped, so return -EAGAIN after notifying userspace.
5645 int md_allow_write(mddev_t *mddev)
5651 if (!mddev->pers->sync_request)
5654 spin_lock_irq(&mddev->write_lock);
5655 if (mddev->in_sync) {
5657 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5658 if (mddev->safemode_delay &&
5659 mddev->safemode == 0)
5660 mddev->safemode = 1;
5661 spin_unlock_irq(&mddev->write_lock);
5662 md_update_sb(mddev, 0);
5663 sysfs_notify_dirent(mddev->sysfs_state);
5665 spin_unlock_irq(&mddev->write_lock);
5667 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
5672 EXPORT_SYMBOL_GPL(md_allow_write);
5674 #define SYNC_MARKS 10
5675 #define SYNC_MARK_STEP (3*HZ)
5676 void md_do_sync(mddev_t *mddev)
5679 unsigned int currspeed = 0,
5681 sector_t max_sectors,j, io_sectors;
5682 unsigned long mark[SYNC_MARKS];
5683 sector_t mark_cnt[SYNC_MARKS];
5685 struct list_head *tmp;
5686 sector_t last_check;
5688 struct list_head *rtmp;
5692 /* just incase thread restarts... */
5693 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5695 if (mddev->ro) /* never try to sync a read-only array */
5698 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5699 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5700 desc = "data-check";
5701 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5702 desc = "requested-resync";
5705 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5710 /* we overload curr_resync somewhat here.
5711 * 0 == not engaged in resync at all
5712 * 2 == checking that there is no conflict with another sync
5713 * 1 == like 2, but have yielded to allow conflicting resync to
5715 * other == active in resync - this many blocks
5717 * Before starting a resync we must have set curr_resync to
5718 * 2, and then checked that every "conflicting" array has curr_resync
5719 * less than ours. When we find one that is the same or higher
5720 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5721 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5722 * This will mean we have to start checking from the beginning again.
5727 mddev->curr_resync = 2;
5730 if (kthread_should_stop()) {
5731 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5734 for_each_mddev(mddev2, tmp) {
5735 if (mddev2 == mddev)
5737 if (!mddev->parallel_resync
5738 && mddev2->curr_resync
5739 && match_mddev_units(mddev, mddev2)) {
5741 if (mddev < mddev2 && mddev->curr_resync == 2) {
5742 /* arbitrarily yield */
5743 mddev->curr_resync = 1;
5744 wake_up(&resync_wait);
5746 if (mddev > mddev2 && mddev->curr_resync == 1)
5747 /* no need to wait here, we can wait the next
5748 * time 'round when curr_resync == 2
5751 /* We need to wait 'interruptible' so as not to
5752 * contribute to the load average, and not to
5753 * be caught by 'softlockup'
5755 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
5756 if (!kthread_should_stop() &&
5757 mddev2->curr_resync >= mddev->curr_resync) {
5758 printk(KERN_INFO "md: delaying %s of %s"
5759 " until %s has finished (they"
5760 " share one or more physical units)\n",
5761 desc, mdname(mddev), mdname(mddev2));
5763 if (signal_pending(current))
5764 flush_signals(current);
5766 finish_wait(&resync_wait, &wq);
5769 finish_wait(&resync_wait, &wq);
5772 } while (mddev->curr_resync < 2);
5775 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5776 /* resync follows the size requested by the personality,
5777 * which defaults to physical size, but can be virtual size
5779 max_sectors = mddev->resync_max_sectors;
5780 mddev->resync_mismatches = 0;
5781 /* we don't use the checkpoint if there's a bitmap */
5782 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5783 j = mddev->resync_min;
5784 else if (!mddev->bitmap)
5785 j = mddev->recovery_cp;
5787 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5788 max_sectors = mddev->size << 1;
5790 /* recovery follows the physical size of devices */
5791 max_sectors = mddev->size << 1;
5793 rdev_for_each(rdev, rtmp, mddev)
5794 if (rdev->raid_disk >= 0 &&
5795 !test_bit(Faulty, &rdev->flags) &&
5796 !test_bit(In_sync, &rdev->flags) &&
5797 rdev->recovery_offset < j)
5798 j = rdev->recovery_offset;
5801 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5802 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5803 " %d KB/sec/disk.\n", speed_min(mddev));
5804 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5805 "(but not more than %d KB/sec) for %s.\n",
5806 speed_max(mddev), desc);
5808 is_mddev_idle(mddev); /* this also initializes IO event counters */
5811 for (m = 0; m < SYNC_MARKS; m++) {
5813 mark_cnt[m] = io_sectors;
5816 mddev->resync_mark = mark[last_mark];
5817 mddev->resync_mark_cnt = mark_cnt[last_mark];
5820 * Tune reconstruction:
5822 window = 32*(PAGE_SIZE/512);
5823 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5824 window/2,(unsigned long long) max_sectors/2);
5826 atomic_set(&mddev->recovery_active, 0);
5831 "md: resuming %s of %s from checkpoint.\n",
5832 desc, mdname(mddev));
5833 mddev->curr_resync = j;
5836 while (j < max_sectors) {
5840 if (j >= mddev->resync_max) {
5841 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5842 wait_event(mddev->recovery_wait,
5843 mddev->resync_max > j
5844 || kthread_should_stop());
5846 if (kthread_should_stop())
5848 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5849 currspeed < speed_min(mddev));
5851 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5855 if (!skipped) { /* actual IO requested */
5856 io_sectors += sectors;
5857 atomic_add(sectors, &mddev->recovery_active);
5861 if (j>1) mddev->curr_resync = j;
5862 mddev->curr_mark_cnt = io_sectors;
5863 if (last_check == 0)
5864 /* this is the earliers that rebuilt will be
5865 * visible in /proc/mdstat
5867 md_new_event(mddev);
5869 if (last_check + window > io_sectors || j == max_sectors)
5872 last_check = io_sectors;
5874 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5878 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5880 int next = (last_mark+1) % SYNC_MARKS;
5882 mddev->resync_mark = mark[next];
5883 mddev->resync_mark_cnt = mark_cnt[next];
5884 mark[next] = jiffies;
5885 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5890 if (kthread_should_stop())
5895 * this loop exits only if either when we are slower than
5896 * the 'hard' speed limit, or the system was IO-idle for
5898 * the system might be non-idle CPU-wise, but we only care
5899 * about not overloading the IO subsystem. (things like an
5900 * e2fsck being done on the RAID array should execute fast)
5902 blk_unplug(mddev->queue);
5905 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5906 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5908 if (currspeed > speed_min(mddev)) {
5909 if ((currspeed > speed_max(mddev)) ||
5910 !is_mddev_idle(mddev)) {
5916 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5918 * this also signals 'finished resyncing' to md_stop
5921 blk_unplug(mddev->queue);
5923 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5925 /* tell personality that we are finished */
5926 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5928 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5929 mddev->curr_resync > 2) {
5930 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5931 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5932 if (mddev->curr_resync >= mddev->recovery_cp) {
5934 "md: checkpointing %s of %s.\n",
5935 desc, mdname(mddev));
5936 mddev->recovery_cp = mddev->curr_resync;
5939 mddev->recovery_cp = MaxSector;
5941 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5942 mddev->curr_resync = MaxSector;
5943 rdev_for_each(rdev, rtmp, mddev)
5944 if (rdev->raid_disk >= 0 &&
5945 !test_bit(Faulty, &rdev->flags) &&
5946 !test_bit(In_sync, &rdev->flags) &&
5947 rdev->recovery_offset < mddev->curr_resync)
5948 rdev->recovery_offset = mddev->curr_resync;
5951 set_bit(MD_CHANGE_DEVS, &mddev->flags);
5954 mddev->curr_resync = 0;
5955 mddev->resync_min = 0;
5956 mddev->resync_max = MaxSector;
5957 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5958 wake_up(&resync_wait);
5959 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
5960 md_wakeup_thread(mddev->thread);
5965 * got a signal, exit.
5968 "md: md_do_sync() got signal ... exiting\n");
5969 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5973 EXPORT_SYMBOL_GPL(md_do_sync);
5976 static int remove_and_add_spares(mddev_t *mddev)
5979 struct list_head *rtmp;
5982 rdev_for_each(rdev, rtmp, mddev)
5983 if (rdev->raid_disk >= 0 &&
5984 !test_bit(Blocked, &rdev->flags) &&
5985 (test_bit(Faulty, &rdev->flags) ||
5986 ! test_bit(In_sync, &rdev->flags)) &&
5987 atomic_read(&rdev->nr_pending)==0) {
5988 if (mddev->pers->hot_remove_disk(
5989 mddev, rdev->raid_disk)==0) {
5991 sprintf(nm,"rd%d", rdev->raid_disk);
5992 sysfs_remove_link(&mddev->kobj, nm);
5993 rdev->raid_disk = -1;
5997 if (mddev->degraded && ! mddev->ro) {
5998 rdev_for_each(rdev, rtmp, mddev) {
5999 if (rdev->raid_disk >= 0 &&
6000 !test_bit(In_sync, &rdev->flags) &&
6001 !test_bit(Blocked, &rdev->flags))
6003 if (rdev->raid_disk < 0
6004 && !test_bit(Faulty, &rdev->flags)) {
6005 rdev->recovery_offset = 0;
6007 hot_add_disk(mddev, rdev) == 0) {
6009 sprintf(nm, "rd%d", rdev->raid_disk);
6010 if (sysfs_create_link(&mddev->kobj,
6013 "md: cannot register "
6017 md_new_event(mddev);
6026 * This routine is regularly called by all per-raid-array threads to
6027 * deal with generic issues like resync and super-block update.
6028 * Raid personalities that don't have a thread (linear/raid0) do not
6029 * need this as they never do any recovery or update the superblock.
6031 * It does not do any resync itself, but rather "forks" off other threads
6032 * to do that as needed.
6033 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6034 * "->recovery" and create a thread at ->sync_thread.
6035 * When the thread finishes it sets MD_RECOVERY_DONE
6036 * and wakeups up this thread which will reap the thread and finish up.
6037 * This thread also removes any faulty devices (with nr_pending == 0).
6039 * The overall approach is:
6040 * 1/ if the superblock needs updating, update it.
6041 * 2/ If a recovery thread is running, don't do anything else.
6042 * 3/ If recovery has finished, clean up, possibly marking spares active.
6043 * 4/ If there are any faulty devices, remove them.
6044 * 5/ If array is degraded, try to add spares devices
6045 * 6/ If array has spares or is not in-sync, start a resync thread.
6047 void md_check_recovery(mddev_t *mddev)
6050 struct list_head *rtmp;
6054 bitmap_daemon_work(mddev->bitmap);
6059 if (signal_pending(current)) {
6060 if (mddev->pers->sync_request && !mddev->external) {
6061 printk(KERN_INFO "md: %s in immediate safe mode\n",
6063 mddev->safemode = 2;
6065 flush_signals(current);
6068 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6071 (mddev->flags && !mddev->external) ||
6072 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6073 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6074 (mddev->external == 0 && mddev->safemode == 1) ||
6075 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6076 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6080 if (mddev_trylock(mddev)) {
6084 /* Only thing we do on a ro array is remove
6087 remove_and_add_spares(mddev);
6088 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6092 if (!mddev->external) {
6094 spin_lock_irq(&mddev->write_lock);
6095 if (mddev->safemode &&
6096 !atomic_read(&mddev->writes_pending) &&
6098 mddev->recovery_cp == MaxSector) {
6101 if (mddev->persistent)
6102 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6104 if (mddev->safemode == 1)
6105 mddev->safemode = 0;
6106 spin_unlock_irq(&mddev->write_lock);
6108 sysfs_notify_dirent(mddev->sysfs_state);
6112 md_update_sb(mddev, 0);
6114 rdev_for_each(rdev, rtmp, mddev)
6115 if (test_and_clear_bit(StateChanged, &rdev->flags))
6116 sysfs_notify(&rdev->kobj, NULL, "state");
6119 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6120 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6121 /* resync/recovery still happening */
6122 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6125 if (mddev->sync_thread) {
6126 /* resync has finished, collect result */
6127 md_unregister_thread(mddev->sync_thread);
6128 mddev->sync_thread = NULL;
6129 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6130 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6132 /* activate any spares */
6133 if (mddev->pers->spare_active(mddev))
6134 sysfs_notify(&mddev->kobj, NULL,
6137 md_update_sb(mddev, 1);
6139 /* if array is no-longer degraded, then any saved_raid_disk
6140 * information must be scrapped
6142 if (!mddev->degraded)
6143 rdev_for_each(rdev, rtmp, mddev)
6144 rdev->saved_raid_disk = -1;
6146 mddev->recovery = 0;
6147 /* flag recovery needed just to double check */
6148 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6149 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6150 md_new_event(mddev);
6153 /* Set RUNNING before clearing NEEDED to avoid
6154 * any transients in the value of "sync_action".
6156 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6157 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6158 /* Clear some bits that don't mean anything, but
6161 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6162 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6164 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6166 /* no recovery is running.
6167 * remove any failed drives, then
6168 * add spares if possible.
6169 * Spare are also removed and re-added, to allow
6170 * the personality to fail the re-add.
6173 if (mddev->reshape_position != MaxSector) {
6174 if (mddev->pers->check_reshape(mddev) != 0)
6175 /* Cannot proceed */
6177 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6178 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6179 } else if ((spares = remove_and_add_spares(mddev))) {
6180 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6181 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6182 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6183 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6184 } else if (mddev->recovery_cp < MaxSector) {
6185 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6186 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6187 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6188 /* nothing to be done ... */
6191 if (mddev->pers->sync_request) {
6192 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6193 /* We are adding a device or devices to an array
6194 * which has the bitmap stored on all devices.
6195 * So make sure all bitmap pages get written
6197 bitmap_write_all(mddev->bitmap);
6199 mddev->sync_thread = md_register_thread(md_do_sync,
6202 if (!mddev->sync_thread) {
6203 printk(KERN_ERR "%s: could not start resync"
6206 /* leave the spares where they are, it shouldn't hurt */
6207 mddev->recovery = 0;
6209 md_wakeup_thread(mddev->sync_thread);
6210 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6211 md_new_event(mddev);
6214 if (!mddev->sync_thread) {
6215 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6216 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6218 sysfs_notify(&mddev->kobj, NULL, "sync_action");
6220 mddev_unlock(mddev);
6224 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6226 sysfs_notify(&rdev->kobj, NULL, "state");
6227 wait_event_timeout(rdev->blocked_wait,
6228 !test_bit(Blocked, &rdev->flags),
6229 msecs_to_jiffies(5000));
6230 rdev_dec_pending(rdev, mddev);
6232 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6234 static int md_notify_reboot(struct notifier_block *this,
6235 unsigned long code, void *x)
6237 struct list_head *tmp;
6240 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6242 printk(KERN_INFO "md: stopping all md devices.\n");
6244 for_each_mddev(mddev, tmp)
6245 if (mddev_trylock(mddev)) {
6246 /* Force a switch to readonly even array
6247 * appears to still be in use. Hence
6250 do_md_stop(mddev, 1, 100);
6251 mddev_unlock(mddev);
6254 * certain more exotic SCSI devices are known to be
6255 * volatile wrt too early system reboots. While the
6256 * right place to handle this issue is the given
6257 * driver, we do want to have a safe RAID driver ...
6264 static struct notifier_block md_notifier = {
6265 .notifier_call = md_notify_reboot,
6267 .priority = INT_MAX, /* before any real devices */
6270 static void md_geninit(void)
6272 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6274 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6277 static int __init md_init(void)
6279 if (register_blkdev(MAJOR_NR, "md"))
6281 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6282 unregister_blkdev(MAJOR_NR, "md");
6285 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6286 md_probe, NULL, NULL);
6287 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6288 md_probe, NULL, NULL);
6290 register_reboot_notifier(&md_notifier);
6291 raid_table_header = register_sysctl_table(raid_root_table);
6301 * Searches all registered partitions for autorun RAID arrays
6305 static LIST_HEAD(all_detected_devices);
6306 struct detected_devices_node {
6307 struct list_head list;
6311 void md_autodetect_dev(dev_t dev)
6313 struct detected_devices_node *node_detected_dev;
6315 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6316 if (node_detected_dev) {
6317 node_detected_dev->dev = dev;
6318 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6320 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6321 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6326 static void autostart_arrays(int part)
6329 struct detected_devices_node *node_detected_dev;
6331 int i_scanned, i_passed;
6336 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6338 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6340 node_detected_dev = list_entry(all_detected_devices.next,
6341 struct detected_devices_node, list);
6342 list_del(&node_detected_dev->list);
6343 dev = node_detected_dev->dev;
6344 kfree(node_detected_dev);
6345 rdev = md_import_device(dev,0, 90);
6349 if (test_bit(Faulty, &rdev->flags)) {
6353 set_bit(AutoDetected, &rdev->flags);
6354 list_add(&rdev->same_set, &pending_raid_disks);
6358 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6359 i_scanned, i_passed);
6361 autorun_devices(part);
6364 #endif /* !MODULE */
6366 static __exit void md_exit(void)
6369 struct list_head *tmp;
6371 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6372 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6374 unregister_blkdev(MAJOR_NR,"md");
6375 unregister_blkdev(mdp_major, "mdp");
6376 unregister_reboot_notifier(&md_notifier);
6377 unregister_sysctl_table(raid_table_header);
6378 remove_proc_entry("mdstat", NULL);
6379 for_each_mddev(mddev, tmp) {
6380 struct gendisk *disk = mddev->gendisk;
6383 export_array(mddev);
6386 mddev->gendisk = NULL;
6391 subsys_initcall(md_init);
6392 module_exit(md_exit)
6394 static int get_ro(char *buffer, struct kernel_param *kp)
6396 return sprintf(buffer, "%d", start_readonly);
6398 static int set_ro(const char *val, struct kernel_param *kp)
6401 int num = simple_strtoul(val, &e, 10);
6402 if (*val && (*e == '\0' || *e == '\n')) {
6403 start_readonly = num;
6409 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6410 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6413 EXPORT_SYMBOL(register_md_personality);
6414 EXPORT_SYMBOL(unregister_md_personality);
6415 EXPORT_SYMBOL(md_error);
6416 EXPORT_SYMBOL(md_done_sync);
6417 EXPORT_SYMBOL(md_write_start);
6418 EXPORT_SYMBOL(md_write_end);
6419 EXPORT_SYMBOL(md_register_thread);
6420 EXPORT_SYMBOL(md_unregister_thread);
6421 EXPORT_SYMBOL(md_wakeup_thread);
6422 EXPORT_SYMBOL(md_check_recovery);
6423 MODULE_LICENSE("GPL");
6425 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);