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 kobject_put(&mddev->kobj);
226 spin_unlock(&all_mddevs_lock);
229 static mddev_t * mddev_find(dev_t unit)
231 mddev_t *mddev, *new = NULL;
234 spin_lock(&all_mddevs_lock);
235 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
236 if (mddev->unit == unit) {
238 spin_unlock(&all_mddevs_lock);
244 list_add(&new->all_mddevs, &all_mddevs);
245 spin_unlock(&all_mddevs_lock);
248 spin_unlock(&all_mddevs_lock);
250 new = kzalloc(sizeof(*new), GFP_KERNEL);
255 if (MAJOR(unit) == MD_MAJOR)
256 new->md_minor = MINOR(unit);
258 new->md_minor = MINOR(unit) >> MdpMinorShift;
260 mutex_init(&new->reconfig_mutex);
261 INIT_LIST_HEAD(&new->disks);
262 INIT_LIST_HEAD(&new->all_mddevs);
263 init_timer(&new->safemode_timer);
264 atomic_set(&new->active, 1);
265 atomic_set(&new->openers, 0);
266 spin_lock_init(&new->write_lock);
267 init_waitqueue_head(&new->sb_wait);
268 init_waitqueue_head(&new->recovery_wait);
269 new->reshape_position = MaxSector;
271 new->resync_max = MaxSector;
272 new->level = LEVEL_NONE;
277 static inline int mddev_lock(mddev_t * mddev)
279 return mutex_lock_interruptible(&mddev->reconfig_mutex);
282 static inline int mddev_trylock(mddev_t * mddev)
284 return mutex_trylock(&mddev->reconfig_mutex);
287 static inline void mddev_unlock(mddev_t * mddev)
289 mutex_unlock(&mddev->reconfig_mutex);
291 md_wakeup_thread(mddev->thread);
294 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
298 list_for_each_entry(rdev, &mddev->disks, same_set)
299 if (rdev->desc_nr == nr)
305 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
309 list_for_each_entry(rdev, &mddev->disks, same_set)
310 if (rdev->bdev->bd_dev == dev)
316 static struct mdk_personality *find_pers(int level, char *clevel)
318 struct mdk_personality *pers;
319 list_for_each_entry(pers, &pers_list, list) {
320 if (level != LEVEL_NONE && pers->level == level)
322 if (strcmp(pers->name, clevel)==0)
328 /* return the offset of the super block in 512byte sectors */
329 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
331 sector_t num_sectors = bdev->bd_inode->i_size / 512;
332 return MD_NEW_SIZE_SECTORS(num_sectors);
335 static sector_t calc_num_sectors(mdk_rdev_t *rdev, unsigned chunk_size)
337 sector_t num_sectors = rdev->sb_start;
340 num_sectors &= ~((sector_t)chunk_size/512 - 1);
344 static int alloc_disk_sb(mdk_rdev_t * rdev)
349 rdev->sb_page = alloc_page(GFP_KERNEL);
350 if (!rdev->sb_page) {
351 printk(KERN_ALERT "md: out of memory.\n");
358 static void free_disk_sb(mdk_rdev_t * rdev)
361 put_page(rdev->sb_page);
363 rdev->sb_page = NULL;
370 static void super_written(struct bio *bio, int error)
372 mdk_rdev_t *rdev = bio->bi_private;
373 mddev_t *mddev = rdev->mddev;
375 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags)) {
376 printk("md: super_written gets error=%d, uptodate=%d\n",
377 error, test_bit(BIO_UPTODATE, &bio->bi_flags));
378 WARN_ON(test_bit(BIO_UPTODATE, &bio->bi_flags));
379 md_error(mddev, rdev);
382 if (atomic_dec_and_test(&mddev->pending_writes))
383 wake_up(&mddev->sb_wait);
387 static void super_written_barrier(struct bio *bio, int error)
389 struct bio *bio2 = bio->bi_private;
390 mdk_rdev_t *rdev = bio2->bi_private;
391 mddev_t *mddev = rdev->mddev;
393 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
394 error == -EOPNOTSUPP) {
396 /* barriers don't appear to be supported :-( */
397 set_bit(BarriersNotsupp, &rdev->flags);
398 mddev->barriers_work = 0;
399 spin_lock_irqsave(&mddev->write_lock, flags);
400 bio2->bi_next = mddev->biolist;
401 mddev->biolist = bio2;
402 spin_unlock_irqrestore(&mddev->write_lock, flags);
403 wake_up(&mddev->sb_wait);
407 bio->bi_private = rdev;
408 super_written(bio, error);
412 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
413 sector_t sector, int size, struct page *page)
415 /* write first size bytes of page to sector of rdev
416 * Increment mddev->pending_writes before returning
417 * and decrement it on completion, waking up sb_wait
418 * if zero is reached.
419 * If an error occurred, call md_error
421 * As we might need to resubmit the request if BIO_RW_BARRIER
422 * causes ENOTSUPP, we allocate a spare bio...
424 struct bio *bio = bio_alloc(GFP_NOIO, 1);
425 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
427 bio->bi_bdev = rdev->bdev;
428 bio->bi_sector = sector;
429 bio_add_page(bio, page, size, 0);
430 bio->bi_private = rdev;
431 bio->bi_end_io = super_written;
434 atomic_inc(&mddev->pending_writes);
435 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
437 rw |= (1<<BIO_RW_BARRIER);
438 rbio = bio_clone(bio, GFP_NOIO);
439 rbio->bi_private = bio;
440 rbio->bi_end_io = super_written_barrier;
441 submit_bio(rw, rbio);
446 void md_super_wait(mddev_t *mddev)
448 /* wait for all superblock writes that were scheduled to complete.
449 * if any had to be retried (due to BARRIER problems), retry them
453 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
454 if (atomic_read(&mddev->pending_writes)==0)
456 while (mddev->biolist) {
458 spin_lock_irq(&mddev->write_lock);
459 bio = mddev->biolist;
460 mddev->biolist = bio->bi_next ;
462 spin_unlock_irq(&mddev->write_lock);
463 submit_bio(bio->bi_rw, bio);
467 finish_wait(&mddev->sb_wait, &wq);
470 static void bi_complete(struct bio *bio, int error)
472 complete((struct completion*)bio->bi_private);
475 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
476 struct page *page, int rw)
478 struct bio *bio = bio_alloc(GFP_NOIO, 1);
479 struct completion event;
482 rw |= (1 << BIO_RW_SYNC);
485 bio->bi_sector = sector;
486 bio_add_page(bio, page, size, 0);
487 init_completion(&event);
488 bio->bi_private = &event;
489 bio->bi_end_io = bi_complete;
491 wait_for_completion(&event);
493 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
497 EXPORT_SYMBOL_GPL(sync_page_io);
499 static int read_disk_sb(mdk_rdev_t * rdev, int size)
501 char b[BDEVNAME_SIZE];
502 if (!rdev->sb_page) {
510 if (!sync_page_io(rdev->bdev, rdev->sb_start, size, rdev->sb_page, READ))
516 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
517 bdevname(rdev->bdev,b));
521 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
523 return sb1->set_uuid0 == sb2->set_uuid0 &&
524 sb1->set_uuid1 == sb2->set_uuid1 &&
525 sb1->set_uuid2 == sb2->set_uuid2 &&
526 sb1->set_uuid3 == sb2->set_uuid3;
529 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
532 mdp_super_t *tmp1, *tmp2;
534 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
535 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
537 if (!tmp1 || !tmp2) {
539 printk(KERN_INFO "md.c sb_equal(): failed to allocate memory!\n");
547 * nr_disks is not constant
552 ret = (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4) == 0);
560 static u32 md_csum_fold(u32 csum)
562 csum = (csum & 0xffff) + (csum >> 16);
563 return (csum & 0xffff) + (csum >> 16);
566 static unsigned int calc_sb_csum(mdp_super_t * sb)
569 u32 *sb32 = (u32*)sb;
571 unsigned int disk_csum, csum;
573 disk_csum = sb->sb_csum;
576 for (i = 0; i < MD_SB_BYTES/4 ; i++)
578 csum = (newcsum & 0xffffffff) + (newcsum>>32);
582 /* This used to use csum_partial, which was wrong for several
583 * reasons including that different results are returned on
584 * different architectures. It isn't critical that we get exactly
585 * the same return value as before (we always csum_fold before
586 * testing, and that removes any differences). However as we
587 * know that csum_partial always returned a 16bit value on
588 * alphas, do a fold to maximise conformity to previous behaviour.
590 sb->sb_csum = md_csum_fold(disk_csum);
592 sb->sb_csum = disk_csum;
599 * Handle superblock details.
600 * We want to be able to handle multiple superblock formats
601 * so we have a common interface to them all, and an array of
602 * different handlers.
603 * We rely on user-space to write the initial superblock, and support
604 * reading and updating of superblocks.
605 * Interface methods are:
606 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
607 * loads and validates a superblock on dev.
608 * if refdev != NULL, compare superblocks on both devices
610 * 0 - dev has a superblock that is compatible with refdev
611 * 1 - dev has a superblock that is compatible and newer than refdev
612 * so dev should be used as the refdev in future
613 * -EINVAL superblock incompatible or invalid
614 * -othererror e.g. -EIO
616 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
617 * Verify that dev is acceptable into mddev.
618 * The first time, mddev->raid_disks will be 0, and data from
619 * dev should be merged in. Subsequent calls check that dev
620 * is new enough. Return 0 or -EINVAL
622 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
623 * Update the superblock for rdev with data in mddev
624 * This does not write to disc.
630 struct module *owner;
631 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev,
633 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
634 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
635 unsigned long long (*rdev_size_change)(mdk_rdev_t *rdev,
636 sector_t num_sectors);
640 * load_super for 0.90.0
642 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
644 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
649 * Calculate the position of the superblock (512byte sectors),
650 * it's at the end of the disk.
652 * It also happens to be a multiple of 4Kb.
654 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
656 ret = read_disk_sb(rdev, MD_SB_BYTES);
661 bdevname(rdev->bdev, b);
662 sb = (mdp_super_t*)page_address(rdev->sb_page);
664 if (sb->md_magic != MD_SB_MAGIC) {
665 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
670 if (sb->major_version != 0 ||
671 sb->minor_version < 90 ||
672 sb->minor_version > 91) {
673 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
674 sb->major_version, sb->minor_version,
679 if (sb->raid_disks <= 0)
682 if (md_csum_fold(calc_sb_csum(sb)) != md_csum_fold(sb->sb_csum)) {
683 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
688 rdev->preferred_minor = sb->md_minor;
689 rdev->data_offset = 0;
690 rdev->sb_size = MD_SB_BYTES;
692 if (sb->state & (1<<MD_SB_BITMAP_PRESENT)) {
693 if (sb->level != 1 && sb->level != 4
694 && sb->level != 5 && sb->level != 6
695 && sb->level != 10) {
696 /* FIXME use a better test */
698 "md: bitmaps not supported for this level.\n");
703 if (sb->level == LEVEL_MULTIPATH)
706 rdev->desc_nr = sb->this_disk.number;
712 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
713 if (!uuid_equal(refsb, sb)) {
714 printk(KERN_WARNING "md: %s has different UUID to %s\n",
715 b, bdevname(refdev->bdev,b2));
718 if (!sb_equal(refsb, sb)) {
719 printk(KERN_WARNING "md: %s has same UUID"
720 " but different superblock to %s\n",
721 b, bdevname(refdev->bdev, b2));
725 ev2 = md_event(refsb);
731 rdev->size = calc_num_sectors(rdev, sb->chunk_size) / 2;
733 if (rdev->size < sb->size && sb->level > 1)
734 /* "this cannot possibly happen" ... */
742 * validate_super for 0.90.0
744 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
747 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
748 __u64 ev1 = md_event(sb);
750 rdev->raid_disk = -1;
751 clear_bit(Faulty, &rdev->flags);
752 clear_bit(In_sync, &rdev->flags);
753 clear_bit(WriteMostly, &rdev->flags);
754 clear_bit(BarriersNotsupp, &rdev->flags);
756 if (mddev->raid_disks == 0) {
757 mddev->major_version = 0;
758 mddev->minor_version = sb->minor_version;
759 mddev->patch_version = sb->patch_version;
761 mddev->chunk_size = sb->chunk_size;
762 mddev->ctime = sb->ctime;
763 mddev->utime = sb->utime;
764 mddev->level = sb->level;
765 mddev->clevel[0] = 0;
766 mddev->layout = sb->layout;
767 mddev->raid_disks = sb->raid_disks;
768 mddev->size = sb->size;
770 mddev->bitmap_offset = 0;
771 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
773 if (mddev->minor_version >= 91) {
774 mddev->reshape_position = sb->reshape_position;
775 mddev->delta_disks = sb->delta_disks;
776 mddev->new_level = sb->new_level;
777 mddev->new_layout = sb->new_layout;
778 mddev->new_chunk = sb->new_chunk;
780 mddev->reshape_position = MaxSector;
781 mddev->delta_disks = 0;
782 mddev->new_level = mddev->level;
783 mddev->new_layout = mddev->layout;
784 mddev->new_chunk = mddev->chunk_size;
787 if (sb->state & (1<<MD_SB_CLEAN))
788 mddev->recovery_cp = MaxSector;
790 if (sb->events_hi == sb->cp_events_hi &&
791 sb->events_lo == sb->cp_events_lo) {
792 mddev->recovery_cp = sb->recovery_cp;
794 mddev->recovery_cp = 0;
797 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
798 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
799 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
800 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
802 mddev->max_disks = MD_SB_DISKS;
804 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
805 mddev->bitmap_file == NULL)
806 mddev->bitmap_offset = mddev->default_bitmap_offset;
808 } else if (mddev->pers == NULL) {
809 /* Insist on good event counter while assembling */
811 if (ev1 < mddev->events)
813 } else if (mddev->bitmap) {
814 /* if adding to array with a bitmap, then we can accept an
815 * older device ... but not too old.
817 if (ev1 < mddev->bitmap->events_cleared)
820 if (ev1 < mddev->events)
821 /* just a hot-add of a new device, leave raid_disk at -1 */
825 if (mddev->level != LEVEL_MULTIPATH) {
826 desc = sb->disks + rdev->desc_nr;
828 if (desc->state & (1<<MD_DISK_FAULTY))
829 set_bit(Faulty, &rdev->flags);
830 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
831 desc->raid_disk < mddev->raid_disks */) {
832 set_bit(In_sync, &rdev->flags);
833 rdev->raid_disk = desc->raid_disk;
835 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
836 set_bit(WriteMostly, &rdev->flags);
837 } else /* MULTIPATH are always insync */
838 set_bit(In_sync, &rdev->flags);
843 * sync_super for 0.90.0
845 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
849 int next_spare = mddev->raid_disks;
852 /* make rdev->sb match mddev data..
855 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
856 * 3/ any empty disks < next_spare become removed
858 * disks[0] gets initialised to REMOVED because
859 * we cannot be sure from other fields if it has
860 * been initialised or not.
863 int active=0, working=0,failed=0,spare=0,nr_disks=0;
865 rdev->sb_size = MD_SB_BYTES;
867 sb = (mdp_super_t*)page_address(rdev->sb_page);
869 memset(sb, 0, sizeof(*sb));
871 sb->md_magic = MD_SB_MAGIC;
872 sb->major_version = mddev->major_version;
873 sb->patch_version = mddev->patch_version;
874 sb->gvalid_words = 0; /* ignored */
875 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
876 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
877 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
878 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
880 sb->ctime = mddev->ctime;
881 sb->level = mddev->level;
882 sb->size = mddev->size;
883 sb->raid_disks = mddev->raid_disks;
884 sb->md_minor = mddev->md_minor;
885 sb->not_persistent = 0;
886 sb->utime = mddev->utime;
888 sb->events_hi = (mddev->events>>32);
889 sb->events_lo = (u32)mddev->events;
891 if (mddev->reshape_position == MaxSector)
892 sb->minor_version = 90;
894 sb->minor_version = 91;
895 sb->reshape_position = mddev->reshape_position;
896 sb->new_level = mddev->new_level;
897 sb->delta_disks = mddev->delta_disks;
898 sb->new_layout = mddev->new_layout;
899 sb->new_chunk = mddev->new_chunk;
901 mddev->minor_version = sb->minor_version;
904 sb->recovery_cp = mddev->recovery_cp;
905 sb->cp_events_hi = (mddev->events>>32);
906 sb->cp_events_lo = (u32)mddev->events;
907 if (mddev->recovery_cp == MaxSector)
908 sb->state = (1<< MD_SB_CLEAN);
912 sb->layout = mddev->layout;
913 sb->chunk_size = mddev->chunk_size;
915 if (mddev->bitmap && mddev->bitmap_file == NULL)
916 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
918 sb->disks[0].state = (1<<MD_DISK_REMOVED);
919 list_for_each_entry(rdev2, &mddev->disks, same_set) {
922 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
923 && !test_bit(Faulty, &rdev2->flags))
924 desc_nr = rdev2->raid_disk;
926 desc_nr = next_spare++;
927 rdev2->desc_nr = desc_nr;
928 d = &sb->disks[rdev2->desc_nr];
930 d->number = rdev2->desc_nr;
931 d->major = MAJOR(rdev2->bdev->bd_dev);
932 d->minor = MINOR(rdev2->bdev->bd_dev);
933 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
934 && !test_bit(Faulty, &rdev2->flags))
935 d->raid_disk = rdev2->raid_disk;
937 d->raid_disk = rdev2->desc_nr; /* compatibility */
938 if (test_bit(Faulty, &rdev2->flags))
939 d->state = (1<<MD_DISK_FAULTY);
940 else if (test_bit(In_sync, &rdev2->flags)) {
941 d->state = (1<<MD_DISK_ACTIVE);
942 d->state |= (1<<MD_DISK_SYNC);
950 if (test_bit(WriteMostly, &rdev2->flags))
951 d->state |= (1<<MD_DISK_WRITEMOSTLY);
953 /* now set the "removed" and "faulty" bits on any missing devices */
954 for (i=0 ; i < mddev->raid_disks ; i++) {
955 mdp_disk_t *d = &sb->disks[i];
956 if (d->state == 0 && d->number == 0) {
959 d->state = (1<<MD_DISK_REMOVED);
960 d->state |= (1<<MD_DISK_FAULTY);
964 sb->nr_disks = nr_disks;
965 sb->active_disks = active;
966 sb->working_disks = working;
967 sb->failed_disks = failed;
968 sb->spare_disks = spare;
970 sb->this_disk = sb->disks[rdev->desc_nr];
971 sb->sb_csum = calc_sb_csum(sb);
975 * rdev_size_change for 0.90.0
977 static unsigned long long
978 super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
980 if (num_sectors && num_sectors < rdev->mddev->size * 2)
981 return 0; /* component must fit device */
982 if (rdev->mddev->bitmap_offset)
983 return 0; /* can't move bitmap */
984 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
985 if (!num_sectors || num_sectors > rdev->sb_start)
986 num_sectors = rdev->sb_start;
987 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
989 md_super_wait(rdev->mddev);
990 return num_sectors / 2; /* kB for sysfs */
995 * version 1 superblock
998 static __le32 calc_sb_1_csum(struct mdp_superblock_1 * sb)
1002 unsigned long long newcsum;
1003 int size = 256 + le32_to_cpu(sb->max_dev)*2;
1004 __le32 *isuper = (__le32*)sb;
1007 disk_csum = sb->sb_csum;
1010 for (i=0; size>=4; size -= 4 )
1011 newcsum += le32_to_cpu(*isuper++);
1014 newcsum += le16_to_cpu(*(__le16*) isuper);
1016 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
1017 sb->sb_csum = disk_csum;
1018 return cpu_to_le32(csum);
1021 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
1023 struct mdp_superblock_1 *sb;
1026 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1030 * Calculate the position of the superblock in 512byte sectors.
1031 * It is always aligned to a 4K boundary and
1032 * depeding on minor_version, it can be:
1033 * 0: At least 8K, but less than 12K, from end of device
1034 * 1: At start of device
1035 * 2: 4K from start of device.
1037 switch(minor_version) {
1039 sb_start = rdev->bdev->bd_inode->i_size >> 9;
1041 sb_start &= ~(sector_t)(4*2-1);
1052 rdev->sb_start = sb_start;
1054 /* superblock is rarely larger than 1K, but it can be larger,
1055 * and it is safe to read 4k, so we do that
1057 ret = read_disk_sb(rdev, 4096);
1058 if (ret) return ret;
1061 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1063 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1064 sb->major_version != cpu_to_le32(1) ||
1065 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1066 le64_to_cpu(sb->super_offset) != rdev->sb_start ||
1067 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1070 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1071 printk("md: invalid superblock checksum on %s\n",
1072 bdevname(rdev->bdev,b));
1075 if (le64_to_cpu(sb->data_size) < 10) {
1076 printk("md: data_size too small on %s\n",
1077 bdevname(rdev->bdev,b));
1080 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET)) {
1081 if (sb->level != cpu_to_le32(1) &&
1082 sb->level != cpu_to_le32(4) &&
1083 sb->level != cpu_to_le32(5) &&
1084 sb->level != cpu_to_le32(6) &&
1085 sb->level != cpu_to_le32(10)) {
1087 "md: bitmaps not supported for this level.\n");
1092 rdev->preferred_minor = 0xffff;
1093 rdev->data_offset = le64_to_cpu(sb->data_offset);
1094 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1096 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1097 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1098 if (rdev->sb_size & bmask)
1099 rdev->sb_size = (rdev->sb_size | bmask) + 1;
1102 && rdev->data_offset < sb_start + (rdev->sb_size/512))
1105 if (sb->level == cpu_to_le32(LEVEL_MULTIPATH))
1108 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1114 struct mdp_superblock_1 *refsb =
1115 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1117 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1118 sb->level != refsb->level ||
1119 sb->layout != refsb->layout ||
1120 sb->chunksize != refsb->chunksize) {
1121 printk(KERN_WARNING "md: %s has strangely different"
1122 " superblock to %s\n",
1123 bdevname(rdev->bdev,b),
1124 bdevname(refdev->bdev,b2));
1127 ev1 = le64_to_cpu(sb->events);
1128 ev2 = le64_to_cpu(refsb->events);
1136 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1138 rdev->size = rdev->sb_start / 2;
1139 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1141 rdev->size = le64_to_cpu(sb->data_size)/2;
1142 if (le32_to_cpu(sb->chunksize))
1143 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1145 if (le64_to_cpu(sb->size) > rdev->size*2)
1150 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1152 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1153 __u64 ev1 = le64_to_cpu(sb->events);
1155 rdev->raid_disk = -1;
1156 clear_bit(Faulty, &rdev->flags);
1157 clear_bit(In_sync, &rdev->flags);
1158 clear_bit(WriteMostly, &rdev->flags);
1159 clear_bit(BarriersNotsupp, &rdev->flags);
1161 if (mddev->raid_disks == 0) {
1162 mddev->major_version = 1;
1163 mddev->patch_version = 0;
1164 mddev->external = 0;
1165 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1166 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1167 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1168 mddev->level = le32_to_cpu(sb->level);
1169 mddev->clevel[0] = 0;
1170 mddev->layout = le32_to_cpu(sb->layout);
1171 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1172 mddev->size = le64_to_cpu(sb->size)/2;
1173 mddev->events = ev1;
1174 mddev->bitmap_offset = 0;
1175 mddev->default_bitmap_offset = 1024 >> 9;
1177 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1178 memcpy(mddev->uuid, sb->set_uuid, 16);
1180 mddev->max_disks = (4096-256)/2;
1182 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1183 mddev->bitmap_file == NULL )
1184 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1186 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1187 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1188 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1189 mddev->new_level = le32_to_cpu(sb->new_level);
1190 mddev->new_layout = le32_to_cpu(sb->new_layout);
1191 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1193 mddev->reshape_position = MaxSector;
1194 mddev->delta_disks = 0;
1195 mddev->new_level = mddev->level;
1196 mddev->new_layout = mddev->layout;
1197 mddev->new_chunk = mddev->chunk_size;
1200 } else if (mddev->pers == NULL) {
1201 /* Insist of good event counter while assembling */
1203 if (ev1 < mddev->events)
1205 } else if (mddev->bitmap) {
1206 /* If adding to array with a bitmap, then we can accept an
1207 * older device, but not too old.
1209 if (ev1 < mddev->bitmap->events_cleared)
1212 if (ev1 < mddev->events)
1213 /* just a hot-add of a new device, leave raid_disk at -1 */
1216 if (mddev->level != LEVEL_MULTIPATH) {
1218 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1220 case 0xffff: /* spare */
1222 case 0xfffe: /* faulty */
1223 set_bit(Faulty, &rdev->flags);
1226 if ((le32_to_cpu(sb->feature_map) &
1227 MD_FEATURE_RECOVERY_OFFSET))
1228 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1230 set_bit(In_sync, &rdev->flags);
1231 rdev->raid_disk = role;
1234 if (sb->devflags & WriteMostly1)
1235 set_bit(WriteMostly, &rdev->flags);
1236 } else /* MULTIPATH are always insync */
1237 set_bit(In_sync, &rdev->flags);
1242 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1244 struct mdp_superblock_1 *sb;
1247 /* make rdev->sb match mddev and rdev data. */
1249 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1251 sb->feature_map = 0;
1253 sb->recovery_offset = cpu_to_le64(0);
1254 memset(sb->pad1, 0, sizeof(sb->pad1));
1255 memset(sb->pad2, 0, sizeof(sb->pad2));
1256 memset(sb->pad3, 0, sizeof(sb->pad3));
1258 sb->utime = cpu_to_le64((__u64)mddev->utime);
1259 sb->events = cpu_to_le64(mddev->events);
1261 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1263 sb->resync_offset = cpu_to_le64(0);
1265 sb->cnt_corrected_read = cpu_to_le32(atomic_read(&rdev->corrected_errors));
1267 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1268 sb->size = cpu_to_le64(mddev->size<<1);
1270 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1271 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1272 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1275 if (rdev->raid_disk >= 0 &&
1276 !test_bit(In_sync, &rdev->flags) &&
1277 rdev->recovery_offset > 0) {
1278 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1279 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1282 if (mddev->reshape_position != MaxSector) {
1283 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1284 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1285 sb->new_layout = cpu_to_le32(mddev->new_layout);
1286 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1287 sb->new_level = cpu_to_le32(mddev->new_level);
1288 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1292 list_for_each_entry(rdev2, &mddev->disks, same_set)
1293 if (rdev2->desc_nr+1 > max_dev)
1294 max_dev = rdev2->desc_nr+1;
1296 if (max_dev > le32_to_cpu(sb->max_dev))
1297 sb->max_dev = cpu_to_le32(max_dev);
1298 for (i=0; i<max_dev;i++)
1299 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1301 list_for_each_entry(rdev2, &mddev->disks, same_set) {
1303 if (test_bit(Faulty, &rdev2->flags))
1304 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1305 else if (test_bit(In_sync, &rdev2->flags))
1306 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1307 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1308 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1310 sb->dev_roles[i] = cpu_to_le16(0xffff);
1313 sb->sb_csum = calc_sb_1_csum(sb);
1316 static unsigned long long
1317 super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors)
1319 struct mdp_superblock_1 *sb;
1320 sector_t max_sectors;
1321 if (num_sectors && num_sectors < rdev->mddev->size * 2)
1322 return 0; /* component must fit device */
1323 if (rdev->sb_start < rdev->data_offset) {
1324 /* minor versions 1 and 2; superblock before data */
1325 max_sectors = rdev->bdev->bd_inode->i_size >> 9;
1326 max_sectors -= rdev->data_offset;
1327 if (!num_sectors || num_sectors > max_sectors)
1328 num_sectors = max_sectors;
1329 } else if (rdev->mddev->bitmap_offset) {
1330 /* minor version 0 with bitmap we can't move */
1333 /* minor version 0; superblock after data */
1335 sb_start = (rdev->bdev->bd_inode->i_size >> 9) - 8*2;
1336 sb_start &= ~(sector_t)(4*2 - 1);
1337 max_sectors = rdev->size * 2 + sb_start - rdev->sb_start;
1338 if (!num_sectors || num_sectors > max_sectors)
1339 num_sectors = max_sectors;
1340 rdev->sb_start = sb_start;
1342 sb = (struct mdp_superblock_1 *) page_address(rdev->sb_page);
1343 sb->data_size = cpu_to_le64(num_sectors);
1344 sb->super_offset = rdev->sb_start;
1345 sb->sb_csum = calc_sb_1_csum(sb);
1346 md_super_write(rdev->mddev, rdev, rdev->sb_start, rdev->sb_size,
1348 md_super_wait(rdev->mddev);
1349 return num_sectors / 2; /* kB for sysfs */
1352 static struct super_type super_types[] = {
1355 .owner = THIS_MODULE,
1356 .load_super = super_90_load,
1357 .validate_super = super_90_validate,
1358 .sync_super = super_90_sync,
1359 .rdev_size_change = super_90_rdev_size_change,
1363 .owner = THIS_MODULE,
1364 .load_super = super_1_load,
1365 .validate_super = super_1_validate,
1366 .sync_super = super_1_sync,
1367 .rdev_size_change = super_1_rdev_size_change,
1371 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1373 mdk_rdev_t *rdev, *rdev2;
1376 rdev_for_each_rcu(rdev, mddev1)
1377 rdev_for_each_rcu(rdev2, mddev2)
1378 if (rdev->bdev->bd_contains ==
1379 rdev2->bdev->bd_contains) {
1387 static LIST_HEAD(pending_raid_disks);
1389 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1391 char b[BDEVNAME_SIZE];
1401 /* prevent duplicates */
1402 if (find_rdev(mddev, rdev->bdev->bd_dev))
1405 /* make sure rdev->size exceeds mddev->size */
1406 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1408 /* Cannot change size, so fail
1409 * If mddev->level <= 0, then we don't care
1410 * about aligning sizes (e.g. linear)
1412 if (mddev->level > 0)
1415 mddev->size = rdev->size;
1418 /* Verify rdev->desc_nr is unique.
1419 * If it is -1, assign a free number, else
1420 * check number is not in use
1422 if (rdev->desc_nr < 0) {
1424 if (mddev->pers) choice = mddev->raid_disks;
1425 while (find_rdev_nr(mddev, choice))
1427 rdev->desc_nr = choice;
1429 if (find_rdev_nr(mddev, rdev->desc_nr))
1432 bdevname(rdev->bdev,b);
1433 while ( (s=strchr(b, '/')) != NULL)
1436 rdev->mddev = mddev;
1437 printk(KERN_INFO "md: bind<%s>\n", b);
1439 if ((err = kobject_add(&rdev->kobj, &mddev->kobj, "dev-%s", b)))
1442 ko = &part_to_dev(rdev->bdev->bd_part)->kobj;
1443 if ((err = sysfs_create_link(&rdev->kobj, ko, "block"))) {
1444 kobject_del(&rdev->kobj);
1447 rdev->sysfs_state = sysfs_get_dirent(rdev->kobj.sd, "state");
1449 list_add_rcu(&rdev->same_set, &mddev->disks);
1450 bd_claim_by_disk(rdev->bdev, rdev->bdev->bd_holder, mddev->gendisk);
1454 printk(KERN_WARNING "md: failed to register dev-%s for %s\n",
1459 static void md_delayed_delete(struct work_struct *ws)
1461 mdk_rdev_t *rdev = container_of(ws, mdk_rdev_t, del_work);
1462 kobject_del(&rdev->kobj);
1463 kobject_put(&rdev->kobj);
1466 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1468 char b[BDEVNAME_SIZE];
1473 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1474 list_del_rcu(&rdev->same_set);
1475 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1477 sysfs_remove_link(&rdev->kobj, "block");
1478 sysfs_put(rdev->sysfs_state);
1479 rdev->sysfs_state = NULL;
1480 /* We need to delay this, otherwise we can deadlock when
1481 * writing to 'remove' to "dev/state". We also need
1482 * to delay it due to rcu usage.
1485 INIT_WORK(&rdev->del_work, md_delayed_delete);
1486 kobject_get(&rdev->kobj);
1487 schedule_work(&rdev->del_work);
1491 * prevent the device from being mounted, repartitioned or
1492 * otherwise reused by a RAID array (or any other kernel
1493 * subsystem), by bd_claiming the device.
1495 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev, int shared)
1498 struct block_device *bdev;
1499 char b[BDEVNAME_SIZE];
1501 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1503 printk(KERN_ERR "md: could not open %s.\n",
1504 __bdevname(dev, b));
1505 return PTR_ERR(bdev);
1507 err = bd_claim(bdev, shared ? (mdk_rdev_t *)lock_rdev : rdev);
1509 printk(KERN_ERR "md: could not bd_claim %s.\n",
1511 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1515 set_bit(AllReserved, &rdev->flags);
1520 static void unlock_rdev(mdk_rdev_t *rdev)
1522 struct block_device *bdev = rdev->bdev;
1527 blkdev_put(bdev, FMODE_READ|FMODE_WRITE);
1530 void md_autodetect_dev(dev_t dev);
1532 static void export_rdev(mdk_rdev_t * rdev)
1534 char b[BDEVNAME_SIZE];
1535 printk(KERN_INFO "md: export_rdev(%s)\n",
1536 bdevname(rdev->bdev,b));
1541 if (test_bit(AutoDetected, &rdev->flags))
1542 md_autodetect_dev(rdev->bdev->bd_dev);
1545 kobject_put(&rdev->kobj);
1548 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1550 unbind_rdev_from_array(rdev);
1554 static void export_array(mddev_t *mddev)
1556 mdk_rdev_t *rdev, *tmp;
1558 rdev_for_each(rdev, tmp, mddev) {
1563 kick_rdev_from_array(rdev);
1565 if (!list_empty(&mddev->disks))
1567 mddev->raid_disks = 0;
1568 mddev->major_version = 0;
1571 static void print_desc(mdp_disk_t *desc)
1573 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1574 desc->major,desc->minor,desc->raid_disk,desc->state);
1577 static void print_sb_90(mdp_super_t *sb)
1582 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1583 sb->major_version, sb->minor_version, sb->patch_version,
1584 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1586 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1587 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1588 sb->md_minor, sb->layout, sb->chunk_size);
1589 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1590 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1591 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1592 sb->failed_disks, sb->spare_disks,
1593 sb->sb_csum, (unsigned long)sb->events_lo);
1596 for (i = 0; i < MD_SB_DISKS; i++) {
1599 desc = sb->disks + i;
1600 if (desc->number || desc->major || desc->minor ||
1601 desc->raid_disk || (desc->state && (desc->state != 4))) {
1602 printk(" D %2d: ", i);
1606 printk(KERN_INFO "md: THIS: ");
1607 print_desc(&sb->this_disk);
1610 static void print_sb_1(struct mdp_superblock_1 *sb)
1614 uuid = sb->set_uuid;
1615 printk(KERN_INFO "md: SB: (V:%u) (F:0x%08x) Array-ID:<%02x%02x%02x%02x"
1616 ":%02x%02x:%02x%02x:%02x%02x:%02x%02x%02x%02x%02x%02x>\n"
1617 KERN_INFO "md: Name: \"%s\" CT:%llu\n",
1618 le32_to_cpu(sb->major_version),
1619 le32_to_cpu(sb->feature_map),
1620 uuid[0], uuid[1], uuid[2], uuid[3],
1621 uuid[4], uuid[5], uuid[6], uuid[7],
1622 uuid[8], uuid[9], uuid[10], uuid[11],
1623 uuid[12], uuid[13], uuid[14], uuid[15],
1625 (unsigned long long)le64_to_cpu(sb->ctime)
1626 & MD_SUPERBLOCK_1_TIME_SEC_MASK);
1628 uuid = sb->device_uuid;
1629 printk(KERN_INFO "md: L%u SZ%llu RD:%u LO:%u CS:%u DO:%llu DS:%llu SO:%llu"
1631 KERN_INFO "md: Dev:%08x UUID: %02x%02x%02x%02x:%02x%02x:%02x%02x:%02x%02x"
1632 ":%02x%02x%02x%02x%02x%02x\n"
1633 KERN_INFO "md: (F:0x%08x) UT:%llu Events:%llu ResyncOffset:%llu CSUM:0x%08x\n"
1634 KERN_INFO "md: (MaxDev:%u) \n",
1635 le32_to_cpu(sb->level),
1636 (unsigned long long)le64_to_cpu(sb->size),
1637 le32_to_cpu(sb->raid_disks),
1638 le32_to_cpu(sb->layout),
1639 le32_to_cpu(sb->chunksize),
1640 (unsigned long long)le64_to_cpu(sb->data_offset),
1641 (unsigned long long)le64_to_cpu(sb->data_size),
1642 (unsigned long long)le64_to_cpu(sb->super_offset),
1643 (unsigned long long)le64_to_cpu(sb->recovery_offset),
1644 le32_to_cpu(sb->dev_number),
1645 uuid[0], uuid[1], uuid[2], uuid[3],
1646 uuid[4], uuid[5], uuid[6], uuid[7],
1647 uuid[8], uuid[9], uuid[10], uuid[11],
1648 uuid[12], uuid[13], uuid[14], uuid[15],
1650 (unsigned long long)le64_to_cpu(sb->utime) & MD_SUPERBLOCK_1_TIME_SEC_MASK,
1651 (unsigned long long)le64_to_cpu(sb->events),
1652 (unsigned long long)le64_to_cpu(sb->resync_offset),
1653 le32_to_cpu(sb->sb_csum),
1654 le32_to_cpu(sb->max_dev)
1658 static void print_rdev(mdk_rdev_t *rdev, int major_version)
1660 char b[BDEVNAME_SIZE];
1661 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1662 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1663 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1665 if (rdev->sb_loaded) {
1666 printk(KERN_INFO "md: rdev superblock (MJ:%d):\n", major_version);
1667 switch (major_version) {
1669 print_sb_90((mdp_super_t*)page_address(rdev->sb_page));
1672 print_sb_1((struct mdp_superblock_1 *)page_address(rdev->sb_page));
1676 printk(KERN_INFO "md: no rdev superblock!\n");
1679 static void md_print_devices(void)
1681 struct list_head *tmp;
1684 char b[BDEVNAME_SIZE];
1687 printk("md: **********************************\n");
1688 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1689 printk("md: **********************************\n");
1690 for_each_mddev(mddev, tmp) {
1693 bitmap_print_sb(mddev->bitmap);
1695 printk("%s: ", mdname(mddev));
1696 list_for_each_entry(rdev, &mddev->disks, same_set)
1697 printk("<%s>", bdevname(rdev->bdev,b));
1700 list_for_each_entry(rdev, &mddev->disks, same_set)
1701 print_rdev(rdev, mddev->major_version);
1703 printk("md: **********************************\n");
1708 static void sync_sbs(mddev_t * mddev, int nospares)
1710 /* Update each superblock (in-memory image), but
1711 * if we are allowed to, skip spares which already
1712 * have the right event counter, or have one earlier
1713 * (which would mean they aren't being marked as dirty
1714 * with the rest of the array)
1718 list_for_each_entry(rdev, &mddev->disks, same_set) {
1719 if (rdev->sb_events == mddev->events ||
1721 rdev->raid_disk < 0 &&
1722 (rdev->sb_events&1)==0 &&
1723 rdev->sb_events+1 == mddev->events)) {
1724 /* Don't update this superblock */
1725 rdev->sb_loaded = 2;
1727 super_types[mddev->major_version].
1728 sync_super(mddev, rdev);
1729 rdev->sb_loaded = 1;
1734 static void md_update_sb(mddev_t * mddev, int force_change)
1740 if (mddev->external)
1743 spin_lock_irq(&mddev->write_lock);
1745 set_bit(MD_CHANGE_PENDING, &mddev->flags);
1746 if (test_and_clear_bit(MD_CHANGE_DEVS, &mddev->flags))
1748 if (test_and_clear_bit(MD_CHANGE_CLEAN, &mddev->flags))
1749 /* just a clean<-> dirty transition, possibly leave spares alone,
1750 * though if events isn't the right even/odd, we will have to do
1756 if (mddev->degraded)
1757 /* If the array is degraded, then skipping spares is both
1758 * dangerous and fairly pointless.
1759 * Dangerous because a device that was removed from the array
1760 * might have a event_count that still looks up-to-date,
1761 * so it can be re-added without a resync.
1762 * Pointless because if there are any spares to skip,
1763 * then a recovery will happen and soon that array won't
1764 * be degraded any more and the spare can go back to sleep then.
1768 sync_req = mddev->in_sync;
1769 mddev->utime = get_seconds();
1771 /* If this is just a dirty<->clean transition, and the array is clean
1772 * and 'events' is odd, we can roll back to the previous clean state */
1774 && (mddev->in_sync && mddev->recovery_cp == MaxSector)
1775 && (mddev->events & 1)
1776 && mddev->events != 1)
1779 /* otherwise we have to go forward and ... */
1781 if (!mddev->in_sync || mddev->recovery_cp != MaxSector) { /* not clean */
1782 /* .. if the array isn't clean, insist on an odd 'events' */
1783 if ((mddev->events&1)==0) {
1788 /* otherwise insist on an even 'events' (for clean states) */
1789 if ((mddev->events&1)) {
1796 if (!mddev->events) {
1798 * oops, this 64-bit counter should never wrap.
1799 * Either we are in around ~1 trillion A.C., assuming
1800 * 1 reboot per second, or we have a bug:
1807 * do not write anything to disk if using
1808 * nonpersistent superblocks
1810 if (!mddev->persistent) {
1811 if (!mddev->external)
1812 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1814 spin_unlock_irq(&mddev->write_lock);
1815 wake_up(&mddev->sb_wait);
1818 sync_sbs(mddev, nospares);
1819 spin_unlock_irq(&mddev->write_lock);
1822 "md: updating %s RAID superblock on device (in sync %d)\n",
1823 mdname(mddev),mddev->in_sync);
1825 bitmap_update_sb(mddev->bitmap);
1826 list_for_each_entry(rdev, &mddev->disks, same_set) {
1827 char b[BDEVNAME_SIZE];
1828 dprintk(KERN_INFO "md: ");
1829 if (rdev->sb_loaded != 1)
1830 continue; /* no noise on spare devices */
1831 if (test_bit(Faulty, &rdev->flags))
1832 dprintk("(skipping faulty ");
1834 dprintk("%s ", bdevname(rdev->bdev,b));
1835 if (!test_bit(Faulty, &rdev->flags)) {
1836 md_super_write(mddev,rdev,
1837 rdev->sb_start, rdev->sb_size,
1839 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1840 bdevname(rdev->bdev,b),
1841 (unsigned long long)rdev->sb_start);
1842 rdev->sb_events = mddev->events;
1846 if (mddev->level == LEVEL_MULTIPATH)
1847 /* only need to write one superblock... */
1850 md_super_wait(mddev);
1851 /* if there was a failure, MD_CHANGE_DEVS was set, and we re-write super */
1853 spin_lock_irq(&mddev->write_lock);
1854 if (mddev->in_sync != sync_req ||
1855 test_bit(MD_CHANGE_DEVS, &mddev->flags)) {
1856 /* have to write it out again */
1857 spin_unlock_irq(&mddev->write_lock);
1860 clear_bit(MD_CHANGE_PENDING, &mddev->flags);
1861 spin_unlock_irq(&mddev->write_lock);
1862 wake_up(&mddev->sb_wait);
1866 /* words written to sysfs files may, or may not, be \n terminated.
1867 * We want to accept with case. For this we use cmd_match.
1869 static int cmd_match(const char *cmd, const char *str)
1871 /* See if cmd, written into a sysfs file, matches
1872 * str. They must either be the same, or cmd can
1873 * have a trailing newline
1875 while (*cmd && *str && *cmd == *str) {
1886 struct rdev_sysfs_entry {
1887 struct attribute attr;
1888 ssize_t (*show)(mdk_rdev_t *, char *);
1889 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1893 state_show(mdk_rdev_t *rdev, char *page)
1898 if (test_bit(Faulty, &rdev->flags)) {
1899 len+= sprintf(page+len, "%sfaulty",sep);
1902 if (test_bit(In_sync, &rdev->flags)) {
1903 len += sprintf(page+len, "%sin_sync",sep);
1906 if (test_bit(WriteMostly, &rdev->flags)) {
1907 len += sprintf(page+len, "%swrite_mostly",sep);
1910 if (test_bit(Blocked, &rdev->flags)) {
1911 len += sprintf(page+len, "%sblocked", sep);
1914 if (!test_bit(Faulty, &rdev->flags) &&
1915 !test_bit(In_sync, &rdev->flags)) {
1916 len += sprintf(page+len, "%sspare", sep);
1919 return len+sprintf(page+len, "\n");
1923 state_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1926 * faulty - simulates and error
1927 * remove - disconnects the device
1928 * writemostly - sets write_mostly
1929 * -writemostly - clears write_mostly
1930 * blocked - sets the Blocked flag
1931 * -blocked - clears the Blocked flag
1934 if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
1935 md_error(rdev->mddev, rdev);
1937 } else if (cmd_match(buf, "remove")) {
1938 if (rdev->raid_disk >= 0)
1941 mddev_t *mddev = rdev->mddev;
1942 kick_rdev_from_array(rdev);
1944 md_update_sb(mddev, 1);
1945 md_new_event(mddev);
1948 } else if (cmd_match(buf, "writemostly")) {
1949 set_bit(WriteMostly, &rdev->flags);
1951 } else if (cmd_match(buf, "-writemostly")) {
1952 clear_bit(WriteMostly, &rdev->flags);
1954 } else if (cmd_match(buf, "blocked")) {
1955 set_bit(Blocked, &rdev->flags);
1957 } else if (cmd_match(buf, "-blocked")) {
1958 clear_bit(Blocked, &rdev->flags);
1959 wake_up(&rdev->blocked_wait);
1960 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
1961 md_wakeup_thread(rdev->mddev->thread);
1965 if (!err && rdev->sysfs_state)
1966 sysfs_notify_dirent(rdev->sysfs_state);
1967 return err ? err : len;
1969 static struct rdev_sysfs_entry rdev_state =
1970 __ATTR(state, S_IRUGO|S_IWUSR, state_show, state_store);
1973 errors_show(mdk_rdev_t *rdev, char *page)
1975 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1979 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1982 unsigned long n = simple_strtoul(buf, &e, 10);
1983 if (*buf && (*e == 0 || *e == '\n')) {
1984 atomic_set(&rdev->corrected_errors, n);
1989 static struct rdev_sysfs_entry rdev_errors =
1990 __ATTR(errors, S_IRUGO|S_IWUSR, errors_show, errors_store);
1993 slot_show(mdk_rdev_t *rdev, char *page)
1995 if (rdev->raid_disk < 0)
1996 return sprintf(page, "none\n");
1998 return sprintf(page, "%d\n", rdev->raid_disk);
2002 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2007 int slot = simple_strtoul(buf, &e, 10);
2008 if (strncmp(buf, "none", 4)==0)
2010 else if (e==buf || (*e && *e!= '\n'))
2012 if (rdev->mddev->pers && slot == -1) {
2013 /* Setting 'slot' on an active array requires also
2014 * updating the 'rd%d' link, and communicating
2015 * with the personality with ->hot_*_disk.
2016 * For now we only support removing
2017 * failed/spare devices. This normally happens automatically,
2018 * but not when the metadata is externally managed.
2020 if (rdev->raid_disk == -1)
2022 /* personality does all needed checks */
2023 if (rdev->mddev->pers->hot_add_disk == NULL)
2025 err = rdev->mddev->pers->
2026 hot_remove_disk(rdev->mddev, rdev->raid_disk);
2029 sprintf(nm, "rd%d", rdev->raid_disk);
2030 sysfs_remove_link(&rdev->mddev->kobj, nm);
2031 set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery);
2032 md_wakeup_thread(rdev->mddev->thread);
2033 } else if (rdev->mddev->pers) {
2035 /* Activating a spare .. or possibly reactivating
2036 * if we every get bitmaps working here.
2039 if (rdev->raid_disk != -1)
2042 if (rdev->mddev->pers->hot_add_disk == NULL)
2045 list_for_each_entry(rdev2, &rdev->mddev->disks, same_set)
2046 if (rdev2->raid_disk == slot)
2049 rdev->raid_disk = slot;
2050 if (test_bit(In_sync, &rdev->flags))
2051 rdev->saved_raid_disk = slot;
2053 rdev->saved_raid_disk = -1;
2054 err = rdev->mddev->pers->
2055 hot_add_disk(rdev->mddev, rdev);
2057 rdev->raid_disk = -1;
2060 sysfs_notify_dirent(rdev->sysfs_state);
2061 sprintf(nm, "rd%d", rdev->raid_disk);
2062 if (sysfs_create_link(&rdev->mddev->kobj, &rdev->kobj, nm))
2064 "md: cannot register "
2066 nm, mdname(rdev->mddev));
2068 /* don't wakeup anyone, leave that to userspace. */
2070 if (slot >= rdev->mddev->raid_disks)
2072 rdev->raid_disk = slot;
2073 /* assume it is working */
2074 clear_bit(Faulty, &rdev->flags);
2075 clear_bit(WriteMostly, &rdev->flags);
2076 set_bit(In_sync, &rdev->flags);
2077 sysfs_notify_dirent(rdev->sysfs_state);
2083 static struct rdev_sysfs_entry rdev_slot =
2084 __ATTR(slot, S_IRUGO|S_IWUSR, slot_show, slot_store);
2087 offset_show(mdk_rdev_t *rdev, char *page)
2089 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
2093 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2096 unsigned long long offset = simple_strtoull(buf, &e, 10);
2097 if (e==buf || (*e && *e != '\n'))
2099 if (rdev->mddev->pers && rdev->raid_disk >= 0)
2101 if (rdev->size && rdev->mddev->external)
2102 /* Must set offset before size, so overlap checks
2105 rdev->data_offset = offset;
2109 static struct rdev_sysfs_entry rdev_offset =
2110 __ATTR(offset, S_IRUGO|S_IWUSR, offset_show, offset_store);
2113 rdev_size_show(mdk_rdev_t *rdev, char *page)
2115 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
2118 static int overlaps(sector_t s1, sector_t l1, sector_t s2, sector_t l2)
2120 /* check if two start/length pairs overlap */
2129 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
2131 unsigned long long size;
2132 unsigned long long oldsize = rdev->size;
2133 mddev_t *my_mddev = rdev->mddev;
2135 if (strict_strtoull(buf, 10, &size) < 0)
2137 if (my_mddev->pers && rdev->raid_disk >= 0) {
2138 if (my_mddev->persistent) {
2139 size = super_types[my_mddev->major_version].
2140 rdev_size_change(rdev, size * 2);
2144 size = (rdev->bdev->bd_inode->i_size >> 10);
2145 size -= rdev->data_offset/2;
2148 if (size < my_mddev->size)
2149 return -EINVAL; /* component must fit device */
2152 if (size > oldsize && my_mddev->external) {
2153 /* need to check that all other rdevs with the same ->bdev
2154 * do not overlap. We need to unlock the mddev to avoid
2155 * a deadlock. We have already changed rdev->size, and if
2156 * we have to change it back, we will have the lock again.
2160 struct list_head *tmp;
2162 mddev_unlock(my_mddev);
2163 for_each_mddev(mddev, tmp) {
2167 list_for_each_entry(rdev2, &mddev->disks, same_set)
2168 if (test_bit(AllReserved, &rdev2->flags) ||
2169 (rdev->bdev == rdev2->bdev &&
2171 overlaps(rdev->data_offset, rdev->size * 2,
2173 rdev2->size * 2))) {
2177 mddev_unlock(mddev);
2183 mddev_lock(my_mddev);
2185 /* Someone else could have slipped in a size
2186 * change here, but doing so is just silly.
2187 * We put oldsize back because we *know* it is
2188 * safe, and trust userspace not to race with
2191 rdev->size = oldsize;
2198 static struct rdev_sysfs_entry rdev_size =
2199 __ATTR(size, S_IRUGO|S_IWUSR, rdev_size_show, rdev_size_store);
2201 static struct attribute *rdev_default_attrs[] = {
2210 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2212 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2213 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2214 mddev_t *mddev = rdev->mddev;
2220 rv = mddev ? mddev_lock(mddev) : -EBUSY;
2222 if (rdev->mddev == NULL)
2225 rv = entry->show(rdev, page);
2226 mddev_unlock(mddev);
2232 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
2233 const char *page, size_t length)
2235 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
2236 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
2238 mddev_t *mddev = rdev->mddev;
2242 if (!capable(CAP_SYS_ADMIN))
2244 rv = mddev ? mddev_lock(mddev): -EBUSY;
2246 if (rdev->mddev == NULL)
2249 rv = entry->store(rdev, page, length);
2250 mddev_unlock(mddev);
2255 static void rdev_free(struct kobject *ko)
2257 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
2260 static struct sysfs_ops rdev_sysfs_ops = {
2261 .show = rdev_attr_show,
2262 .store = rdev_attr_store,
2264 static struct kobj_type rdev_ktype = {
2265 .release = rdev_free,
2266 .sysfs_ops = &rdev_sysfs_ops,
2267 .default_attrs = rdev_default_attrs,
2271 * Import a device. If 'super_format' >= 0, then sanity check the superblock
2273 * mark the device faulty if:
2275 * - the device is nonexistent (zero size)
2276 * - the device has no valid superblock
2278 * a faulty rdev _never_ has rdev->sb set.
2280 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
2282 char b[BDEVNAME_SIZE];
2287 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
2289 printk(KERN_ERR "md: could not alloc mem for new device!\n");
2290 return ERR_PTR(-ENOMEM);
2293 if ((err = alloc_disk_sb(rdev)))
2296 err = lock_rdev(rdev, newdev, super_format == -2);
2300 kobject_init(&rdev->kobj, &rdev_ktype);
2303 rdev->saved_raid_disk = -1;
2304 rdev->raid_disk = -1;
2306 rdev->data_offset = 0;
2307 rdev->sb_events = 0;
2308 atomic_set(&rdev->nr_pending, 0);
2309 atomic_set(&rdev->read_errors, 0);
2310 atomic_set(&rdev->corrected_errors, 0);
2312 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
2315 "md: %s has zero or unknown size, marking faulty!\n",
2316 bdevname(rdev->bdev,b));
2321 if (super_format >= 0) {
2322 err = super_types[super_format].
2323 load_super(rdev, NULL, super_minor);
2324 if (err == -EINVAL) {
2326 "md: %s does not have a valid v%d.%d "
2327 "superblock, not importing!\n",
2328 bdevname(rdev->bdev,b),
2329 super_format, super_minor);
2334 "md: could not read %s's sb, not importing!\n",
2335 bdevname(rdev->bdev,b));
2340 INIT_LIST_HEAD(&rdev->same_set);
2341 init_waitqueue_head(&rdev->blocked_wait);
2346 if (rdev->sb_page) {
2352 return ERR_PTR(err);
2356 * Check a full RAID array for plausibility
2360 static void analyze_sbs(mddev_t * mddev)
2363 mdk_rdev_t *rdev, *freshest, *tmp;
2364 char b[BDEVNAME_SIZE];
2367 rdev_for_each(rdev, tmp, mddev)
2368 switch (super_types[mddev->major_version].
2369 load_super(rdev, freshest, mddev->minor_version)) {
2377 "md: fatal superblock inconsistency in %s"
2378 " -- removing from array\n",
2379 bdevname(rdev->bdev,b));
2380 kick_rdev_from_array(rdev);
2384 super_types[mddev->major_version].
2385 validate_super(mddev, freshest);
2388 rdev_for_each(rdev, tmp, mddev) {
2389 if (rdev != freshest)
2390 if (super_types[mddev->major_version].
2391 validate_super(mddev, rdev)) {
2392 printk(KERN_WARNING "md: kicking non-fresh %s"
2394 bdevname(rdev->bdev,b));
2395 kick_rdev_from_array(rdev);
2398 if (mddev->level == LEVEL_MULTIPATH) {
2399 rdev->desc_nr = i++;
2400 rdev->raid_disk = rdev->desc_nr;
2401 set_bit(In_sync, &rdev->flags);
2402 } else if (rdev->raid_disk >= mddev->raid_disks) {
2403 rdev->raid_disk = -1;
2404 clear_bit(In_sync, &rdev->flags);
2410 if (mddev->recovery_cp != MaxSector &&
2412 printk(KERN_ERR "md: %s: raid array is not clean"
2413 " -- starting background reconstruction\n",
2418 static void md_safemode_timeout(unsigned long data);
2421 safe_delay_show(mddev_t *mddev, char *page)
2423 int msec = (mddev->safemode_delay*1000)/HZ;
2424 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2427 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2435 /* remove a period, and count digits after it */
2436 if (len >= sizeof(buf))
2438 strlcpy(buf, cbuf, sizeof(buf));
2439 for (i=0; i<len; i++) {
2441 if (isdigit(buf[i])) {
2446 } else if (buf[i] == '.') {
2451 if (strict_strtoul(buf, 10, &msec) < 0)
2453 msec = (msec * 1000) / scale;
2455 mddev->safemode_delay = 0;
2457 unsigned long old_delay = mddev->safemode_delay;
2458 mddev->safemode_delay = (msec*HZ)/1000;
2459 if (mddev->safemode_delay == 0)
2460 mddev->safemode_delay = 1;
2461 if (mddev->safemode_delay < old_delay)
2462 md_safemode_timeout((unsigned long)mddev);
2466 static struct md_sysfs_entry md_safe_delay =
2467 __ATTR(safe_mode_delay, S_IRUGO|S_IWUSR,safe_delay_show, safe_delay_store);
2470 level_show(mddev_t *mddev, char *page)
2472 struct mdk_personality *p = mddev->pers;
2474 return sprintf(page, "%s\n", p->name);
2475 else if (mddev->clevel[0])
2476 return sprintf(page, "%s\n", mddev->clevel);
2477 else if (mddev->level != LEVEL_NONE)
2478 return sprintf(page, "%d\n", mddev->level);
2484 level_store(mddev_t *mddev, const char *buf, size_t len)
2491 if (len >= sizeof(mddev->clevel))
2493 strncpy(mddev->clevel, buf, len);
2494 if (mddev->clevel[len-1] == '\n')
2496 mddev->clevel[len] = 0;
2497 mddev->level = LEVEL_NONE;
2501 static struct md_sysfs_entry md_level =
2502 __ATTR(level, S_IRUGO|S_IWUSR, level_show, level_store);
2506 layout_show(mddev_t *mddev, char *page)
2508 /* just a number, not meaningful for all levels */
2509 if (mddev->reshape_position != MaxSector &&
2510 mddev->layout != mddev->new_layout)
2511 return sprintf(page, "%d (%d)\n",
2512 mddev->new_layout, mddev->layout);
2513 return sprintf(page, "%d\n", mddev->layout);
2517 layout_store(mddev_t *mddev, const char *buf, size_t len)
2520 unsigned long n = simple_strtoul(buf, &e, 10);
2522 if (!*buf || (*e && *e != '\n'))
2527 if (mddev->reshape_position != MaxSector)
2528 mddev->new_layout = n;
2533 static struct md_sysfs_entry md_layout =
2534 __ATTR(layout, S_IRUGO|S_IWUSR, layout_show, layout_store);
2538 raid_disks_show(mddev_t *mddev, char *page)
2540 if (mddev->raid_disks == 0)
2542 if (mddev->reshape_position != MaxSector &&
2543 mddev->delta_disks != 0)
2544 return sprintf(page, "%d (%d)\n", mddev->raid_disks,
2545 mddev->raid_disks - mddev->delta_disks);
2546 return sprintf(page, "%d\n", mddev->raid_disks);
2549 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2552 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2556 unsigned long n = simple_strtoul(buf, &e, 10);
2558 if (!*buf || (*e && *e != '\n'))
2562 rv = update_raid_disks(mddev, n);
2563 else if (mddev->reshape_position != MaxSector) {
2564 int olddisks = mddev->raid_disks - mddev->delta_disks;
2565 mddev->delta_disks = n - olddisks;
2566 mddev->raid_disks = n;
2568 mddev->raid_disks = n;
2569 return rv ? rv : len;
2571 static struct md_sysfs_entry md_raid_disks =
2572 __ATTR(raid_disks, S_IRUGO|S_IWUSR, raid_disks_show, raid_disks_store);
2575 chunk_size_show(mddev_t *mddev, char *page)
2577 if (mddev->reshape_position != MaxSector &&
2578 mddev->chunk_size != mddev->new_chunk)
2579 return sprintf(page, "%d (%d)\n", mddev->new_chunk,
2581 return sprintf(page, "%d\n", mddev->chunk_size);
2585 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2587 /* can only set chunk_size if array is not yet active */
2589 unsigned long n = simple_strtoul(buf, &e, 10);
2591 if (!*buf || (*e && *e != '\n'))
2596 else if (mddev->reshape_position != MaxSector)
2597 mddev->new_chunk = n;
2599 mddev->chunk_size = n;
2602 static struct md_sysfs_entry md_chunk_size =
2603 __ATTR(chunk_size, S_IRUGO|S_IWUSR, chunk_size_show, chunk_size_store);
2606 resync_start_show(mddev_t *mddev, char *page)
2608 return sprintf(page, "%llu\n", (unsigned long long)mddev->recovery_cp);
2612 resync_start_store(mddev_t *mddev, const char *buf, size_t len)
2615 unsigned long long n = simple_strtoull(buf, &e, 10);
2619 if (!*buf || (*e && *e != '\n'))
2622 mddev->recovery_cp = n;
2625 static struct md_sysfs_entry md_resync_start =
2626 __ATTR(resync_start, S_IRUGO|S_IWUSR, resync_start_show, resync_start_store);
2629 * The array state can be:
2632 * No devices, no size, no level
2633 * Equivalent to STOP_ARRAY ioctl
2635 * May have some settings, but array is not active
2636 * all IO results in error
2637 * When written, doesn't tear down array, but just stops it
2638 * suspended (not supported yet)
2639 * All IO requests will block. The array can be reconfigured.
2640 * Writing this, if accepted, will block until array is quiescent
2642 * no resync can happen. no superblocks get written.
2643 * write requests fail
2645 * like readonly, but behaves like 'clean' on a write request.
2647 * clean - no pending writes, but otherwise active.
2648 * When written to inactive array, starts without resync
2649 * If a write request arrives then
2650 * if metadata is known, mark 'dirty' and switch to 'active'.
2651 * if not known, block and switch to write-pending
2652 * If written to an active array that has pending writes, then fails.
2654 * fully active: IO and resync can be happening.
2655 * When written to inactive array, starts with resync
2658 * clean, but writes are blocked waiting for 'active' to be written.
2661 * like active, but no writes have been seen for a while (100msec).
2664 enum array_state { clear, inactive, suspended, readonly, read_auto, clean, active,
2665 write_pending, active_idle, bad_word};
2666 static char *array_states[] = {
2667 "clear", "inactive", "suspended", "readonly", "read-auto", "clean", "active",
2668 "write-pending", "active-idle", NULL };
2670 static int match_word(const char *word, char **list)
2673 for (n=0; list[n]; n++)
2674 if (cmd_match(word, list[n]))
2680 array_state_show(mddev_t *mddev, char *page)
2682 enum array_state st = inactive;
2695 else if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
2697 else if (mddev->safemode)
2703 if (list_empty(&mddev->disks) &&
2704 mddev->raid_disks == 0 &&
2710 return sprintf(page, "%s\n", array_states[st]);
2713 static int do_md_stop(mddev_t * mddev, int ro, int is_open);
2714 static int do_md_run(mddev_t * mddev);
2715 static int restart_array(mddev_t *mddev);
2718 array_state_store(mddev_t *mddev, const char *buf, size_t len)
2721 enum array_state st = match_word(buf, array_states);
2726 /* stopping an active array */
2727 if (atomic_read(&mddev->openers) > 0)
2729 err = do_md_stop(mddev, 0, 0);
2732 /* stopping an active array */
2734 if (atomic_read(&mddev->openers) > 0)
2736 err = do_md_stop(mddev, 2, 0);
2738 err = 0; /* already inactive */
2741 break; /* not supported yet */
2744 err = do_md_stop(mddev, 1, 0);
2747 set_disk_ro(mddev->gendisk, 1);
2748 err = do_md_run(mddev);
2754 err = do_md_stop(mddev, 1, 0);
2755 else if (mddev->ro == 1)
2756 err = restart_array(mddev);
2759 set_disk_ro(mddev->gendisk, 0);
2763 err = do_md_run(mddev);
2768 restart_array(mddev);
2769 spin_lock_irq(&mddev->write_lock);
2770 if (atomic_read(&mddev->writes_pending) == 0) {
2771 if (mddev->in_sync == 0) {
2773 if (mddev->safemode == 1)
2774 mddev->safemode = 0;
2775 if (mddev->persistent)
2776 set_bit(MD_CHANGE_CLEAN,
2782 spin_unlock_irq(&mddev->write_lock);
2785 mddev->recovery_cp = MaxSector;
2786 err = do_md_run(mddev);
2791 restart_array(mddev);
2792 if (mddev->external)
2793 clear_bit(MD_CHANGE_CLEAN, &mddev->flags);
2794 wake_up(&mddev->sb_wait);
2798 set_disk_ro(mddev->gendisk, 0);
2799 err = do_md_run(mddev);
2804 /* these cannot be set */
2810 sysfs_notify_dirent(mddev->sysfs_state);
2814 static struct md_sysfs_entry md_array_state =
2815 __ATTR(array_state, S_IRUGO|S_IWUSR, array_state_show, array_state_store);
2818 null_show(mddev_t *mddev, char *page)
2824 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2826 /* buf must be %d:%d\n? giving major and minor numbers */
2827 /* The new device is added to the array.
2828 * If the array has a persistent superblock, we read the
2829 * superblock to initialise info and check validity.
2830 * Otherwise, only checking done is that in bind_rdev_to_array,
2831 * which mainly checks size.
2834 int major = simple_strtoul(buf, &e, 10);
2840 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2842 minor = simple_strtoul(e+1, &e, 10);
2843 if (*e && *e != '\n')
2845 dev = MKDEV(major, minor);
2846 if (major != MAJOR(dev) ||
2847 minor != MINOR(dev))
2851 if (mddev->persistent) {
2852 rdev = md_import_device(dev, mddev->major_version,
2853 mddev->minor_version);
2854 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2855 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2856 mdk_rdev_t, same_set);
2857 err = super_types[mddev->major_version]
2858 .load_super(rdev, rdev0, mddev->minor_version);
2862 } else if (mddev->external)
2863 rdev = md_import_device(dev, -2, -1);
2865 rdev = md_import_device(dev, -1, -1);
2868 return PTR_ERR(rdev);
2869 err = bind_rdev_to_array(rdev, mddev);
2873 return err ? err : len;
2876 static struct md_sysfs_entry md_new_device =
2877 __ATTR(new_dev, S_IWUSR, null_show, new_dev_store);
2880 bitmap_store(mddev_t *mddev, const char *buf, size_t len)
2883 unsigned long chunk, end_chunk;
2887 /* buf should be <chunk> <chunk> ... or <chunk>-<chunk> ... (range) */
2889 chunk = end_chunk = simple_strtoul(buf, &end, 0);
2890 if (buf == end) break;
2891 if (*end == '-') { /* range */
2893 end_chunk = simple_strtoul(buf, &end, 0);
2894 if (buf == end) break;
2896 if (*end && !isspace(*end)) break;
2897 bitmap_dirty_bits(mddev->bitmap, chunk, end_chunk);
2899 while (isspace(*buf)) buf++;
2901 bitmap_unplug(mddev->bitmap); /* flush the bits to disk */
2906 static struct md_sysfs_entry md_bitmap =
2907 __ATTR(bitmap_set_bits, S_IWUSR, null_show, bitmap_store);
2910 size_show(mddev_t *mddev, char *page)
2912 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2915 static int update_size(mddev_t *mddev, sector_t num_sectors);
2918 size_store(mddev_t *mddev, const char *buf, size_t len)
2920 /* If array is inactive, we can reduce the component size, but
2921 * not increase it (except from 0).
2922 * If array is active, we can try an on-line resize
2926 unsigned long long size = simple_strtoull(buf, &e, 10);
2927 if (!*buf || *buf == '\n' ||
2932 err = update_size(mddev, size * 2);
2933 md_update_sb(mddev, 1);
2935 if (mddev->size == 0 ||
2941 return err ? err : len;
2944 static struct md_sysfs_entry md_size =
2945 __ATTR(component_size, S_IRUGO|S_IWUSR, size_show, size_store);
2950 * 'none' for arrays with no metadata (good luck...)
2951 * 'external' for arrays with externally managed metadata,
2952 * or N.M for internally known formats
2955 metadata_show(mddev_t *mddev, char *page)
2957 if (mddev->persistent)
2958 return sprintf(page, "%d.%d\n",
2959 mddev->major_version, mddev->minor_version);
2960 else if (mddev->external)
2961 return sprintf(page, "external:%s\n", mddev->metadata_type);
2963 return sprintf(page, "none\n");
2967 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2971 /* Changing the details of 'external' metadata is
2972 * always permitted. Otherwise there must be
2973 * no devices attached to the array.
2975 if (mddev->external && strncmp(buf, "external:", 9) == 0)
2977 else if (!list_empty(&mddev->disks))
2980 if (cmd_match(buf, "none")) {
2981 mddev->persistent = 0;
2982 mddev->external = 0;
2983 mddev->major_version = 0;
2984 mddev->minor_version = 90;
2987 if (strncmp(buf, "external:", 9) == 0) {
2988 size_t namelen = len-9;
2989 if (namelen >= sizeof(mddev->metadata_type))
2990 namelen = sizeof(mddev->metadata_type)-1;
2991 strncpy(mddev->metadata_type, buf+9, namelen);
2992 mddev->metadata_type[namelen] = 0;
2993 if (namelen && mddev->metadata_type[namelen-1] == '\n')
2994 mddev->metadata_type[--namelen] = 0;
2995 mddev->persistent = 0;
2996 mddev->external = 1;
2997 mddev->major_version = 0;
2998 mddev->minor_version = 90;
3001 major = simple_strtoul(buf, &e, 10);
3002 if (e==buf || *e != '.')
3005 minor = simple_strtoul(buf, &e, 10);
3006 if (e==buf || (*e && *e != '\n') )
3008 if (major >= ARRAY_SIZE(super_types) || super_types[major].name == NULL)
3010 mddev->major_version = major;
3011 mddev->minor_version = minor;
3012 mddev->persistent = 1;
3013 mddev->external = 0;
3017 static struct md_sysfs_entry md_metadata =
3018 __ATTR(metadata_version, S_IRUGO|S_IWUSR, metadata_show, metadata_store);
3021 action_show(mddev_t *mddev, char *page)
3023 char *type = "idle";
3024 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3025 (!mddev->ro && test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))) {
3026 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
3028 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
3029 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
3031 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
3035 } else if (test_bit(MD_RECOVERY_RECOVER, &mddev->recovery))
3038 return sprintf(page, "%s\n", type);
3042 action_store(mddev_t *mddev, const char *page, size_t len)
3044 if (!mddev->pers || !mddev->pers->sync_request)
3047 if (cmd_match(page, "idle")) {
3048 if (mddev->sync_thread) {
3049 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3050 md_unregister_thread(mddev->sync_thread);
3051 mddev->sync_thread = NULL;
3052 mddev->recovery = 0;
3054 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
3055 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
3057 else if (cmd_match(page, "resync"))
3058 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3059 else if (cmd_match(page, "recover")) {
3060 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
3061 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3062 } else if (cmd_match(page, "reshape")) {
3064 if (mddev->pers->start_reshape == NULL)
3066 err = mddev->pers->start_reshape(mddev);
3069 sysfs_notify(&mddev->kobj, NULL, "degraded");
3071 if (cmd_match(page, "check"))
3072 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
3073 else if (!cmd_match(page, "repair"))
3075 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
3076 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
3078 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3079 md_wakeup_thread(mddev->thread);
3080 sysfs_notify_dirent(mddev->sysfs_action);
3085 mismatch_cnt_show(mddev_t *mddev, char *page)
3087 return sprintf(page, "%llu\n",
3088 (unsigned long long) mddev->resync_mismatches);
3091 static struct md_sysfs_entry md_scan_mode =
3092 __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
3095 static struct md_sysfs_entry md_mismatches = __ATTR_RO(mismatch_cnt);
3098 sync_min_show(mddev_t *mddev, char *page)
3100 return sprintf(page, "%d (%s)\n", speed_min(mddev),
3101 mddev->sync_speed_min ? "local": "system");
3105 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
3109 if (strncmp(buf, "system", 6)==0) {
3110 mddev->sync_speed_min = 0;
3113 min = simple_strtoul(buf, &e, 10);
3114 if (buf == e || (*e && *e != '\n') || min <= 0)
3116 mddev->sync_speed_min = min;
3120 static struct md_sysfs_entry md_sync_min =
3121 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
3124 sync_max_show(mddev_t *mddev, char *page)
3126 return sprintf(page, "%d (%s)\n", speed_max(mddev),
3127 mddev->sync_speed_max ? "local": "system");
3131 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
3135 if (strncmp(buf, "system", 6)==0) {
3136 mddev->sync_speed_max = 0;
3139 max = simple_strtoul(buf, &e, 10);
3140 if (buf == e || (*e && *e != '\n') || max <= 0)
3142 mddev->sync_speed_max = max;
3146 static struct md_sysfs_entry md_sync_max =
3147 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
3150 degraded_show(mddev_t *mddev, char *page)
3152 return sprintf(page, "%d\n", mddev->degraded);
3154 static struct md_sysfs_entry md_degraded = __ATTR_RO(degraded);
3157 sync_force_parallel_show(mddev_t *mddev, char *page)
3159 return sprintf(page, "%d\n", mddev->parallel_resync);
3163 sync_force_parallel_store(mddev_t *mddev, const char *buf, size_t len)
3167 if (strict_strtol(buf, 10, &n))
3170 if (n != 0 && n != 1)
3173 mddev->parallel_resync = n;
3175 if (mddev->sync_thread)
3176 wake_up(&resync_wait);
3181 /* force parallel resync, even with shared block devices */
3182 static struct md_sysfs_entry md_sync_force_parallel =
3183 __ATTR(sync_force_parallel, S_IRUGO|S_IWUSR,
3184 sync_force_parallel_show, sync_force_parallel_store);
3187 sync_speed_show(mddev_t *mddev, char *page)
3189 unsigned long resync, dt, db;
3190 resync = mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active);
3191 dt = (jiffies - mddev->resync_mark) / HZ;
3193 db = resync - mddev->resync_mark_cnt;
3194 return sprintf(page, "%lu\n", db/dt/2); /* K/sec */
3197 static struct md_sysfs_entry md_sync_speed = __ATTR_RO(sync_speed);
3200 sync_completed_show(mddev_t *mddev, char *page)
3202 unsigned long max_blocks, resync;
3204 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
3205 max_blocks = mddev->resync_max_sectors;
3207 max_blocks = mddev->size << 1;
3209 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
3210 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
3213 static struct md_sysfs_entry md_sync_completed = __ATTR_RO(sync_completed);
3216 min_sync_show(mddev_t *mddev, char *page)
3218 return sprintf(page, "%llu\n",
3219 (unsigned long long)mddev->resync_min);
3222 min_sync_store(mddev_t *mddev, const char *buf, size_t len)
3224 unsigned long long min;
3225 if (strict_strtoull(buf, 10, &min))
3227 if (min > mddev->resync_max)
3229 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3232 /* Must be a multiple of chunk_size */
3233 if (mddev->chunk_size) {
3234 if (min & (sector_t)((mddev->chunk_size>>9)-1))
3237 mddev->resync_min = min;
3242 static struct md_sysfs_entry md_min_sync =
3243 __ATTR(sync_min, S_IRUGO|S_IWUSR, min_sync_show, min_sync_store);
3246 max_sync_show(mddev_t *mddev, char *page)
3248 if (mddev->resync_max == MaxSector)
3249 return sprintf(page, "max\n");
3251 return sprintf(page, "%llu\n",
3252 (unsigned long long)mddev->resync_max);
3255 max_sync_store(mddev_t *mddev, const char *buf, size_t len)
3257 if (strncmp(buf, "max", 3) == 0)
3258 mddev->resync_max = MaxSector;
3260 unsigned long long max;
3261 if (strict_strtoull(buf, 10, &max))
3263 if (max < mddev->resync_min)
3265 if (max < mddev->resync_max &&
3266 test_bit(MD_RECOVERY_RUNNING, &mddev->recovery))
3269 /* Must be a multiple of chunk_size */
3270 if (mddev->chunk_size) {
3271 if (max & (sector_t)((mddev->chunk_size>>9)-1))
3274 mddev->resync_max = max;
3276 wake_up(&mddev->recovery_wait);
3280 static struct md_sysfs_entry md_max_sync =
3281 __ATTR(sync_max, S_IRUGO|S_IWUSR, max_sync_show, max_sync_store);
3284 suspend_lo_show(mddev_t *mddev, char *page)
3286 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
3290 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
3293 unsigned long long new = simple_strtoull(buf, &e, 10);
3295 if (mddev->pers->quiesce == NULL)
3297 if (buf == e || (*e && *e != '\n'))
3299 if (new >= mddev->suspend_hi ||
3300 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
3301 mddev->suspend_lo = new;
3302 mddev->pers->quiesce(mddev, 2);
3307 static struct md_sysfs_entry md_suspend_lo =
3308 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
3312 suspend_hi_show(mddev_t *mddev, char *page)
3314 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
3318 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
3321 unsigned long long new = simple_strtoull(buf, &e, 10);
3323 if (mddev->pers->quiesce == NULL)
3325 if (buf == e || (*e && *e != '\n'))
3327 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
3328 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
3329 mddev->suspend_hi = new;
3330 mddev->pers->quiesce(mddev, 1);
3331 mddev->pers->quiesce(mddev, 0);
3336 static struct md_sysfs_entry md_suspend_hi =
3337 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
3340 reshape_position_show(mddev_t *mddev, char *page)
3342 if (mddev->reshape_position != MaxSector)
3343 return sprintf(page, "%llu\n",
3344 (unsigned long long)mddev->reshape_position);
3345 strcpy(page, "none\n");
3350 reshape_position_store(mddev_t *mddev, const char *buf, size_t len)
3353 unsigned long long new = simple_strtoull(buf, &e, 10);
3356 if (buf == e || (*e && *e != '\n'))
3358 mddev->reshape_position = new;
3359 mddev->delta_disks = 0;
3360 mddev->new_level = mddev->level;
3361 mddev->new_layout = mddev->layout;
3362 mddev->new_chunk = mddev->chunk_size;
3366 static struct md_sysfs_entry md_reshape_position =
3367 __ATTR(reshape_position, S_IRUGO|S_IWUSR, reshape_position_show,
3368 reshape_position_store);
3371 static struct attribute *md_default_attrs[] = {
3374 &md_raid_disks.attr,
3375 &md_chunk_size.attr,
3377 &md_resync_start.attr,
3379 &md_new_device.attr,
3380 &md_safe_delay.attr,
3381 &md_array_state.attr,
3382 &md_reshape_position.attr,
3386 static struct attribute *md_redundancy_attrs[] = {
3388 &md_mismatches.attr,
3391 &md_sync_speed.attr,
3392 &md_sync_force_parallel.attr,
3393 &md_sync_completed.attr,
3396 &md_suspend_lo.attr,
3397 &md_suspend_hi.attr,
3402 static struct attribute_group md_redundancy_group = {
3404 .attrs = md_redundancy_attrs,
3409 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
3411 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3412 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3417 rv = mddev_lock(mddev);
3419 rv = entry->show(mddev, page);
3420 mddev_unlock(mddev);
3426 md_attr_store(struct kobject *kobj, struct attribute *attr,
3427 const char *page, size_t length)
3429 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
3430 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
3435 if (!capable(CAP_SYS_ADMIN))
3437 rv = mddev_lock(mddev);
3439 rv = entry->store(mddev, page, length);
3440 mddev_unlock(mddev);
3445 static void md_free(struct kobject *ko)
3447 mddev_t *mddev = container_of(ko, mddev_t, kobj);
3449 if (mddev->sysfs_state)
3450 sysfs_put(mddev->sysfs_state);
3452 if (mddev->gendisk) {
3453 del_gendisk(mddev->gendisk);
3454 put_disk(mddev->gendisk);
3457 blk_cleanup_queue(mddev->queue);
3462 static struct sysfs_ops md_sysfs_ops = {
3463 .show = md_attr_show,
3464 .store = md_attr_store,
3466 static struct kobj_type md_ktype = {
3468 .sysfs_ops = &md_sysfs_ops,
3469 .default_attrs = md_default_attrs,
3474 static struct kobject *md_probe(dev_t dev, int *part, void *data)
3476 static DEFINE_MUTEX(disks_mutex);
3477 mddev_t *mddev = mddev_find(dev);
3478 struct gendisk *disk;
3479 int partitioned = (MAJOR(dev) != MD_MAJOR);
3480 int shift = partitioned ? MdpMinorShift : 0;
3481 int unit = MINOR(dev) >> shift;
3487 mutex_lock(&disks_mutex);
3488 if (mddev->gendisk) {
3489 mutex_unlock(&disks_mutex);
3494 mddev->queue = blk_alloc_queue(GFP_KERNEL);
3495 if (!mddev->queue) {
3496 mutex_unlock(&disks_mutex);
3500 /* Can be unlocked because the queue is new: no concurrency */
3501 queue_flag_set_unlocked(QUEUE_FLAG_CLUSTER, mddev->queue);
3503 blk_queue_make_request(mddev->queue, md_fail_request);
3505 disk = alloc_disk(1 << shift);
3507 mutex_unlock(&disks_mutex);
3508 blk_cleanup_queue(mddev->queue);
3509 mddev->queue = NULL;
3513 disk->major = MAJOR(dev);
3514 disk->first_minor = unit << shift;
3516 sprintf(disk->disk_name, "md_d%d", unit);
3518 sprintf(disk->disk_name, "md%d", unit);
3519 disk->fops = &md_fops;
3520 disk->private_data = mddev;
3521 disk->queue = mddev->queue;
3522 /* Allow extended partitions. This makes the
3523 * 'mdp' device redundant, but we can really
3526 disk->flags |= GENHD_FL_EXT_DEVT;
3528 mddev->gendisk = disk;
3529 error = kobject_init_and_add(&mddev->kobj, &md_ktype,
3530 &disk_to_dev(disk)->kobj, "%s", "md");
3531 mutex_unlock(&disks_mutex);
3533 printk(KERN_WARNING "md: cannot register %s/md - name in use\n",
3536 kobject_uevent(&mddev->kobj, KOBJ_ADD);
3537 mddev->sysfs_state = sysfs_get_dirent(mddev->kobj.sd, "array_state");
3542 static void md_safemode_timeout(unsigned long data)
3544 mddev_t *mddev = (mddev_t *) data;
3546 if (!atomic_read(&mddev->writes_pending)) {
3547 mddev->safemode = 1;
3548 if (mddev->external)
3549 sysfs_notify_dirent(mddev->sysfs_state);
3551 md_wakeup_thread(mddev->thread);
3554 static int start_dirty_degraded;
3556 static int do_md_run(mddev_t * mddev)
3561 struct gendisk *disk;
3562 struct mdk_personality *pers;
3563 char b[BDEVNAME_SIZE];
3565 if (list_empty(&mddev->disks))
3566 /* cannot run an array with no devices.. */
3573 * Analyze all RAID superblock(s)
3575 if (!mddev->raid_disks) {
3576 if (!mddev->persistent)
3581 chunk_size = mddev->chunk_size;
3584 if (chunk_size > MAX_CHUNK_SIZE) {
3585 printk(KERN_ERR "too big chunk_size: %d > %d\n",
3586 chunk_size, MAX_CHUNK_SIZE);
3590 * chunk-size has to be a power of 2
3592 if ( (1 << ffz(~chunk_size)) != chunk_size) {
3593 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
3597 /* devices must have minimum size of one chunk */
3598 list_for_each_entry(rdev, &mddev->disks, same_set) {
3599 if (test_bit(Faulty, &rdev->flags))
3601 if (rdev->size < chunk_size / 1024) {
3603 "md: Dev %s smaller than chunk_size:"
3605 bdevname(rdev->bdev,b),
3606 (unsigned long long)rdev->size,
3613 if (mddev->level != LEVEL_NONE)
3614 request_module("md-level-%d", mddev->level);
3615 else if (mddev->clevel[0])
3616 request_module("md-%s", mddev->clevel);
3619 * Drop all container device buffers, from now on
3620 * the only valid external interface is through the md
3623 list_for_each_entry(rdev, &mddev->disks, same_set) {
3624 if (test_bit(Faulty, &rdev->flags))
3626 sync_blockdev(rdev->bdev);
3627 invalidate_bdev(rdev->bdev);
3629 /* perform some consistency tests on the device.
3630 * We don't want the data to overlap the metadata,
3631 * Internal Bitmap issues has handled elsewhere.
3633 if (rdev->data_offset < rdev->sb_start) {
3635 rdev->data_offset + mddev->size*2
3637 printk("md: %s: data overlaps metadata\n",
3642 if (rdev->sb_start + rdev->sb_size/512
3643 > rdev->data_offset) {
3644 printk("md: %s: metadata overlaps data\n",
3649 sysfs_notify_dirent(rdev->sysfs_state);
3652 md_probe(mddev->unit, NULL, NULL);
3653 disk = mddev->gendisk;
3657 spin_lock(&pers_lock);
3658 pers = find_pers(mddev->level, mddev->clevel);
3659 if (!pers || !try_module_get(pers->owner)) {
3660 spin_unlock(&pers_lock);
3661 if (mddev->level != LEVEL_NONE)
3662 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
3665 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
3670 spin_unlock(&pers_lock);
3671 mddev->level = pers->level;
3672 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
3674 if (mddev->reshape_position != MaxSector &&
3675 pers->start_reshape == NULL) {
3676 /* This personality cannot handle reshaping... */
3678 module_put(pers->owner);
3682 if (pers->sync_request) {
3683 /* Warn if this is a potentially silly
3686 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3690 list_for_each_entry(rdev, &mddev->disks, same_set)
3691 list_for_each_entry(rdev2, &mddev->disks, same_set) {
3693 rdev->bdev->bd_contains ==
3694 rdev2->bdev->bd_contains) {
3696 "%s: WARNING: %s appears to be"
3697 " on the same physical disk as"
3700 bdevname(rdev->bdev,b),
3701 bdevname(rdev2->bdev,b2));
3708 "True protection against single-disk"
3709 " failure might be compromised.\n");
3712 mddev->recovery = 0;
3713 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
3714 mddev->barriers_work = 1;
3715 mddev->ok_start_degraded = start_dirty_degraded;
3718 mddev->ro = 2; /* read-only, but switch on first write */
3720 err = mddev->pers->run(mddev);
3722 printk(KERN_ERR "md: pers->run() failed ...\n");
3723 else if (mddev->pers->sync_request) {
3724 err = bitmap_create(mddev);
3726 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
3727 mdname(mddev), err);
3728 mddev->pers->stop(mddev);
3732 module_put(mddev->pers->owner);
3734 bitmap_destroy(mddev);
3737 if (mddev->pers->sync_request) {
3738 if (sysfs_create_group(&mddev->kobj, &md_redundancy_group))
3740 "md: cannot register extra attributes for %s\n",
3742 mddev->sysfs_action = sysfs_get_dirent(mddev->kobj.sd, "sync_action");
3743 } else if (mddev->ro == 2) /* auto-readonly not meaningful */
3746 atomic_set(&mddev->writes_pending,0);
3747 mddev->safemode = 0;
3748 mddev->safemode_timer.function = md_safemode_timeout;
3749 mddev->safemode_timer.data = (unsigned long) mddev;
3750 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
3753 list_for_each_entry(rdev, &mddev->disks, same_set)
3754 if (rdev->raid_disk >= 0) {
3756 sprintf(nm, "rd%d", rdev->raid_disk);
3757 if (sysfs_create_link(&mddev->kobj, &rdev->kobj, nm))
3758 printk("md: cannot register %s for %s\n",
3762 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3765 md_update_sb(mddev, 0);
3767 set_capacity(disk, mddev->array_sectors);
3769 /* If we call blk_queue_make_request here, it will
3770 * re-initialise max_sectors etc which may have been
3771 * refined inside -> run. So just set the bits we need to set.
3772 * Most initialisation happended when we called
3773 * blk_queue_make_request(..., md_fail_request)
3776 mddev->queue->queuedata = mddev;
3777 mddev->queue->make_request_fn = mddev->pers->make_request;
3779 /* If there is a partially-recovered drive we need to
3780 * start recovery here. If we leave it to md_check_recovery,
3781 * it will remove the drives and not do the right thing
3783 if (mddev->degraded && !mddev->sync_thread) {
3785 list_for_each_entry(rdev, &mddev->disks, same_set)
3786 if (rdev->raid_disk >= 0 &&
3787 !test_bit(In_sync, &rdev->flags) &&
3788 !test_bit(Faulty, &rdev->flags))
3789 /* complete an interrupted recovery */
3791 if (spares && mddev->pers->sync_request) {
3792 mddev->recovery = 0;
3793 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
3794 mddev->sync_thread = md_register_thread(md_do_sync,
3797 if (!mddev->sync_thread) {
3798 printk(KERN_ERR "%s: could not start resync"
3801 /* leave the spares where they are, it shouldn't hurt */
3802 mddev->recovery = 0;
3806 md_wakeup_thread(mddev->thread);
3807 md_wakeup_thread(mddev->sync_thread); /* possibly kick off a reshape */
3810 md_new_event(mddev);
3811 sysfs_notify_dirent(mddev->sysfs_state);
3812 if (mddev->sysfs_action)
3813 sysfs_notify_dirent(mddev->sysfs_action);
3814 sysfs_notify(&mddev->kobj, NULL, "degraded");
3815 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
3819 static int restart_array(mddev_t *mddev)
3821 struct gendisk *disk = mddev->gendisk;
3823 /* Complain if it has no devices */
3824 if (list_empty(&mddev->disks))
3830 mddev->safemode = 0;
3832 set_disk_ro(disk, 0);
3833 printk(KERN_INFO "md: %s switched to read-write mode.\n",
3835 /* Kick recovery or resync if necessary */
3836 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3837 md_wakeup_thread(mddev->thread);
3838 md_wakeup_thread(mddev->sync_thread);
3839 sysfs_notify_dirent(mddev->sysfs_state);
3843 /* similar to deny_write_access, but accounts for our holding a reference
3844 * to the file ourselves */
3845 static int deny_bitmap_write_access(struct file * file)
3847 struct inode *inode = file->f_mapping->host;
3849 spin_lock(&inode->i_lock);
3850 if (atomic_read(&inode->i_writecount) > 1) {
3851 spin_unlock(&inode->i_lock);
3854 atomic_set(&inode->i_writecount, -1);
3855 spin_unlock(&inode->i_lock);
3860 static void restore_bitmap_write_access(struct file *file)
3862 struct inode *inode = file->f_mapping->host;
3864 spin_lock(&inode->i_lock);
3865 atomic_set(&inode->i_writecount, 1);
3866 spin_unlock(&inode->i_lock);
3870 * 0 - completely stop and dis-assemble array
3871 * 1 - switch to readonly
3872 * 2 - stop but do not disassemble array
3874 static int do_md_stop(mddev_t * mddev, int mode, int is_open)
3877 struct gendisk *disk = mddev->gendisk;
3879 if (atomic_read(&mddev->openers) > is_open) {
3880 printk("md: %s still in use.\n",mdname(mddev));
3886 if (mddev->sync_thread) {
3887 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3888 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
3889 md_unregister_thread(mddev->sync_thread);
3890 mddev->sync_thread = NULL;
3893 del_timer_sync(&mddev->safemode_timer);
3896 case 1: /* readonly */
3902 case 0: /* disassemble */
3904 bitmap_flush(mddev);
3905 md_super_wait(mddev);
3907 set_disk_ro(disk, 0);
3908 blk_queue_make_request(mddev->queue, md_fail_request);
3909 mddev->pers->stop(mddev);
3910 mddev->queue->merge_bvec_fn = NULL;
3911 mddev->queue->unplug_fn = NULL;
3912 mddev->queue->backing_dev_info.congested_fn = NULL;
3913 if (mddev->pers->sync_request) {
3914 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
3915 if (mddev->sysfs_action)
3916 sysfs_put(mddev->sysfs_action);
3917 mddev->sysfs_action = NULL;
3919 module_put(mddev->pers->owner);
3921 /* tell userspace to handle 'inactive' */
3922 sysfs_notify_dirent(mddev->sysfs_state);
3924 set_capacity(disk, 0);
3930 if (!mddev->in_sync || mddev->flags) {
3931 /* mark array as shutdown cleanly */
3933 md_update_sb(mddev, 1);
3936 set_disk_ro(disk, 1);
3937 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
3941 * Free resources if final stop
3946 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
3948 bitmap_destroy(mddev);
3949 if (mddev->bitmap_file) {
3950 restore_bitmap_write_access(mddev->bitmap_file);
3951 fput(mddev->bitmap_file);
3952 mddev->bitmap_file = NULL;
3954 mddev->bitmap_offset = 0;
3956 list_for_each_entry(rdev, &mddev->disks, same_set)
3957 if (rdev->raid_disk >= 0) {
3959 sprintf(nm, "rd%d", rdev->raid_disk);
3960 sysfs_remove_link(&mddev->kobj, nm);
3963 /* make sure all md_delayed_delete calls have finished */
3964 flush_scheduled_work();
3966 export_array(mddev);
3968 mddev->array_sectors = 0;
3970 mddev->raid_disks = 0;
3971 mddev->recovery_cp = 0;
3972 mddev->resync_min = 0;
3973 mddev->resync_max = MaxSector;
3974 mddev->reshape_position = MaxSector;
3975 mddev->external = 0;
3976 mddev->persistent = 0;
3977 mddev->level = LEVEL_NONE;
3978 mddev->clevel[0] = 0;
3981 mddev->metadata_type[0] = 0;
3982 mddev->chunk_size = 0;
3983 mddev->ctime = mddev->utime = 0;
3985 mddev->max_disks = 0;
3987 mddev->delta_disks = 0;
3988 mddev->new_level = LEVEL_NONE;
3989 mddev->new_layout = 0;
3990 mddev->new_chunk = 0;
3991 mddev->curr_resync = 0;
3992 mddev->resync_mismatches = 0;
3993 mddev->suspend_lo = mddev->suspend_hi = 0;
3994 mddev->sync_speed_min = mddev->sync_speed_max = 0;
3995 mddev->recovery = 0;
3998 mddev->degraded = 0;
3999 mddev->barriers_work = 0;
4000 mddev->safemode = 0;
4001 kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);
4003 } else if (mddev->pers)
4004 printk(KERN_INFO "md: %s switched to read-only mode.\n",
4007 md_new_event(mddev);
4008 sysfs_notify_dirent(mddev->sysfs_state);
4014 static void autorun_array(mddev_t *mddev)
4019 if (list_empty(&mddev->disks))
4022 printk(KERN_INFO "md: running: ");
4024 list_for_each_entry(rdev, &mddev->disks, same_set) {
4025 char b[BDEVNAME_SIZE];
4026 printk("<%s>", bdevname(rdev->bdev,b));
4030 err = do_md_run(mddev);
4032 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
4033 do_md_stop(mddev, 0, 0);
4038 * lets try to run arrays based on all disks that have arrived
4039 * until now. (those are in pending_raid_disks)
4041 * the method: pick the first pending disk, collect all disks with
4042 * the same UUID, remove all from the pending list and put them into
4043 * the 'same_array' list. Then order this list based on superblock
4044 * update time (freshest comes first), kick out 'old' disks and
4045 * compare superblocks. If everything's fine then run it.
4047 * If "unit" is allocated, then bump its reference count
4049 static void autorun_devices(int part)
4051 mdk_rdev_t *rdev0, *rdev, *tmp;
4053 char b[BDEVNAME_SIZE];
4055 printk(KERN_INFO "md: autorun ...\n");
4056 while (!list_empty(&pending_raid_disks)) {
4059 LIST_HEAD(candidates);
4060 rdev0 = list_entry(pending_raid_disks.next,
4061 mdk_rdev_t, same_set);
4063 printk(KERN_INFO "md: considering %s ...\n",
4064 bdevname(rdev0->bdev,b));
4065 INIT_LIST_HEAD(&candidates);
4066 rdev_for_each_list(rdev, tmp, &pending_raid_disks)
4067 if (super_90_load(rdev, rdev0, 0) >= 0) {
4068 printk(KERN_INFO "md: adding %s ...\n",
4069 bdevname(rdev->bdev,b));
4070 list_move(&rdev->same_set, &candidates);
4073 * now we have a set of devices, with all of them having
4074 * mostly sane superblocks. It's time to allocate the
4078 dev = MKDEV(mdp_major,
4079 rdev0->preferred_minor << MdpMinorShift);
4080 unit = MINOR(dev) >> MdpMinorShift;
4082 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
4085 if (rdev0->preferred_minor != unit) {
4086 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
4087 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
4091 md_probe(dev, NULL, NULL);
4092 mddev = mddev_find(dev);
4093 if (!mddev || !mddev->gendisk) {
4097 "md: cannot allocate memory for md drive.\n");
4100 if (mddev_lock(mddev))
4101 printk(KERN_WARNING "md: %s locked, cannot run\n",
4103 else if (mddev->raid_disks || mddev->major_version
4104 || !list_empty(&mddev->disks)) {
4106 "md: %s already running, cannot run %s\n",
4107 mdname(mddev), bdevname(rdev0->bdev,b));
4108 mddev_unlock(mddev);
4110 printk(KERN_INFO "md: created %s\n", mdname(mddev));
4111 mddev->persistent = 1;
4112 rdev_for_each_list(rdev, tmp, &candidates) {
4113 list_del_init(&rdev->same_set);
4114 if (bind_rdev_to_array(rdev, mddev))
4117 autorun_array(mddev);
4118 mddev_unlock(mddev);
4120 /* on success, candidates will be empty, on error
4123 rdev_for_each_list(rdev, tmp, &candidates) {
4124 list_del_init(&rdev->same_set);
4129 printk(KERN_INFO "md: ... autorun DONE.\n");
4131 #endif /* !MODULE */
4133 static int get_version(void __user * arg)
4137 ver.major = MD_MAJOR_VERSION;
4138 ver.minor = MD_MINOR_VERSION;
4139 ver.patchlevel = MD_PATCHLEVEL_VERSION;
4141 if (copy_to_user(arg, &ver, sizeof(ver)))
4147 static int get_array_info(mddev_t * mddev, void __user * arg)
4149 mdu_array_info_t info;
4150 int nr,working,active,failed,spare;
4153 nr=working=active=failed=spare=0;
4154 list_for_each_entry(rdev, &mddev->disks, same_set) {
4156 if (test_bit(Faulty, &rdev->flags))
4160 if (test_bit(In_sync, &rdev->flags))
4167 info.major_version = mddev->major_version;
4168 info.minor_version = mddev->minor_version;
4169 info.patch_version = MD_PATCHLEVEL_VERSION;
4170 info.ctime = mddev->ctime;
4171 info.level = mddev->level;
4172 info.size = mddev->size;
4173 if (info.size != mddev->size) /* overflow */
4176 info.raid_disks = mddev->raid_disks;
4177 info.md_minor = mddev->md_minor;
4178 info.not_persistent= !mddev->persistent;
4180 info.utime = mddev->utime;
4183 info.state = (1<<MD_SB_CLEAN);
4184 if (mddev->bitmap && mddev->bitmap_offset)
4185 info.state = (1<<MD_SB_BITMAP_PRESENT);
4186 info.active_disks = active;
4187 info.working_disks = working;
4188 info.failed_disks = failed;
4189 info.spare_disks = spare;
4191 info.layout = mddev->layout;
4192 info.chunk_size = mddev->chunk_size;
4194 if (copy_to_user(arg, &info, sizeof(info)))
4200 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
4202 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
4203 char *ptr, *buf = NULL;
4206 if (md_allow_write(mddev))
4207 file = kmalloc(sizeof(*file), GFP_NOIO);
4209 file = kmalloc(sizeof(*file), GFP_KERNEL);
4214 /* bitmap disabled, zero the first byte and copy out */
4215 if (!mddev->bitmap || !mddev->bitmap->file) {
4216 file->pathname[0] = '\0';
4220 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
4224 ptr = d_path(&mddev->bitmap->file->f_path, buf, sizeof(file->pathname));
4228 strcpy(file->pathname, ptr);
4232 if (copy_to_user(arg, file, sizeof(*file)))
4240 static int get_disk_info(mddev_t * mddev, void __user * arg)
4242 mdu_disk_info_t info;
4245 if (copy_from_user(&info, arg, sizeof(info)))
4248 rdev = find_rdev_nr(mddev, info.number);
4250 info.major = MAJOR(rdev->bdev->bd_dev);
4251 info.minor = MINOR(rdev->bdev->bd_dev);
4252 info.raid_disk = rdev->raid_disk;
4254 if (test_bit(Faulty, &rdev->flags))
4255 info.state |= (1<<MD_DISK_FAULTY);
4256 else if (test_bit(In_sync, &rdev->flags)) {
4257 info.state |= (1<<MD_DISK_ACTIVE);
4258 info.state |= (1<<MD_DISK_SYNC);
4260 if (test_bit(WriteMostly, &rdev->flags))
4261 info.state |= (1<<MD_DISK_WRITEMOSTLY);
4263 info.major = info.minor = 0;
4264 info.raid_disk = -1;
4265 info.state = (1<<MD_DISK_REMOVED);
4268 if (copy_to_user(arg, &info, sizeof(info)))
4274 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
4276 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
4278 dev_t dev = MKDEV(info->major,info->minor);
4280 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
4283 if (!mddev->raid_disks) {
4285 /* expecting a device which has a superblock */
4286 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
4289 "md: md_import_device returned %ld\n",
4291 return PTR_ERR(rdev);
4293 if (!list_empty(&mddev->disks)) {
4294 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
4295 mdk_rdev_t, same_set);
4296 int err = super_types[mddev->major_version]
4297 .load_super(rdev, rdev0, mddev->minor_version);
4300 "md: %s has different UUID to %s\n",
4301 bdevname(rdev->bdev,b),
4302 bdevname(rdev0->bdev,b2));
4307 err = bind_rdev_to_array(rdev, mddev);
4314 * add_new_disk can be used once the array is assembled
4315 * to add "hot spares". They must already have a superblock
4320 if (!mddev->pers->hot_add_disk) {
4322 "%s: personality does not support diskops!\n",
4326 if (mddev->persistent)
4327 rdev = md_import_device(dev, mddev->major_version,
4328 mddev->minor_version);
4330 rdev = md_import_device(dev, -1, -1);
4333 "md: md_import_device returned %ld\n",
4335 return PTR_ERR(rdev);
4337 /* set save_raid_disk if appropriate */
4338 if (!mddev->persistent) {
4339 if (info->state & (1<<MD_DISK_SYNC) &&
4340 info->raid_disk < mddev->raid_disks)
4341 rdev->raid_disk = info->raid_disk;
4343 rdev->raid_disk = -1;
4345 super_types[mddev->major_version].
4346 validate_super(mddev, rdev);
4347 rdev->saved_raid_disk = rdev->raid_disk;
4349 clear_bit(In_sync, &rdev->flags); /* just to be sure */
4350 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4351 set_bit(WriteMostly, &rdev->flags);
4353 rdev->raid_disk = -1;
4354 err = bind_rdev_to_array(rdev, mddev);
4355 if (!err && !mddev->pers->hot_remove_disk) {
4356 /* If there is hot_add_disk but no hot_remove_disk
4357 * then added disks for geometry changes,
4358 * and should be added immediately.
4360 super_types[mddev->major_version].
4361 validate_super(mddev, rdev);
4362 err = mddev->pers->hot_add_disk(mddev, rdev);
4364 unbind_rdev_from_array(rdev);
4369 sysfs_notify_dirent(rdev->sysfs_state);
4371 md_update_sb(mddev, 1);
4372 if (mddev->degraded)
4373 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
4374 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4375 md_wakeup_thread(mddev->thread);
4379 /* otherwise, add_new_disk is only allowed
4380 * for major_version==0 superblocks
4382 if (mddev->major_version != 0) {
4383 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
4388 if (!(info->state & (1<<MD_DISK_FAULTY))) {
4390 rdev = md_import_device(dev, -1, 0);
4393 "md: error, md_import_device() returned %ld\n",
4395 return PTR_ERR(rdev);
4397 rdev->desc_nr = info->number;
4398 if (info->raid_disk < mddev->raid_disks)
4399 rdev->raid_disk = info->raid_disk;
4401 rdev->raid_disk = -1;
4403 if (rdev->raid_disk < mddev->raid_disks)
4404 if (info->state & (1<<MD_DISK_SYNC))
4405 set_bit(In_sync, &rdev->flags);
4407 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
4408 set_bit(WriteMostly, &rdev->flags);
4410 if (!mddev->persistent) {
4411 printk(KERN_INFO "md: nonpersistent superblock ...\n");
4412 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4414 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4415 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4417 err = bind_rdev_to_array(rdev, mddev);
4427 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
4429 char b[BDEVNAME_SIZE];
4432 rdev = find_rdev(mddev, dev);
4436 if (rdev->raid_disk >= 0)
4439 kick_rdev_from_array(rdev);
4440 md_update_sb(mddev, 1);
4441 md_new_event(mddev);
4445 printk(KERN_WARNING "md: cannot remove active disk %s from %s ...\n",
4446 bdevname(rdev->bdev,b), mdname(mddev));
4450 static int hot_add_disk(mddev_t * mddev, dev_t dev)
4452 char b[BDEVNAME_SIZE];
4459 if (mddev->major_version != 0) {
4460 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
4461 " version-0 superblocks.\n",
4465 if (!mddev->pers->hot_add_disk) {
4467 "%s: personality does not support diskops!\n",
4472 rdev = md_import_device(dev, -1, 0);
4475 "md: error, md_import_device() returned %ld\n",
4480 if (mddev->persistent)
4481 rdev->sb_start = calc_dev_sboffset(rdev->bdev);
4483 rdev->sb_start = rdev->bdev->bd_inode->i_size / 512;
4485 rdev->size = calc_num_sectors(rdev, mddev->chunk_size) / 2;
4487 if (test_bit(Faulty, &rdev->flags)) {
4489 "md: can not hot-add faulty %s disk to %s!\n",
4490 bdevname(rdev->bdev,b), mdname(mddev));
4494 clear_bit(In_sync, &rdev->flags);
4496 rdev->saved_raid_disk = -1;
4497 err = bind_rdev_to_array(rdev, mddev);
4502 * The rest should better be atomic, we can have disk failures
4503 * noticed in interrupt contexts ...
4506 if (rdev->desc_nr == mddev->max_disks) {
4507 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
4510 goto abort_unbind_export;
4513 rdev->raid_disk = -1;
4515 md_update_sb(mddev, 1);
4518 * Kick recovery, maybe this spare has to be added to the
4519 * array immediately.
4521 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4522 md_wakeup_thread(mddev->thread);
4523 md_new_event(mddev);
4526 abort_unbind_export:
4527 unbind_rdev_from_array(rdev);
4534 static int set_bitmap_file(mddev_t *mddev, int fd)
4539 if (!mddev->pers->quiesce)
4541 if (mddev->recovery || mddev->sync_thread)
4543 /* we should be able to change the bitmap.. */
4549 return -EEXIST; /* cannot add when bitmap is present */
4550 mddev->bitmap_file = fget(fd);
4552 if (mddev->bitmap_file == NULL) {
4553 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
4558 err = deny_bitmap_write_access(mddev->bitmap_file);
4560 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
4562 fput(mddev->bitmap_file);
4563 mddev->bitmap_file = NULL;
4566 mddev->bitmap_offset = 0; /* file overrides offset */
4567 } else if (mddev->bitmap == NULL)
4568 return -ENOENT; /* cannot remove what isn't there */
4571 mddev->pers->quiesce(mddev, 1);
4573 err = bitmap_create(mddev);
4574 if (fd < 0 || err) {
4575 bitmap_destroy(mddev);
4576 fd = -1; /* make sure to put the file */
4578 mddev->pers->quiesce(mddev, 0);
4581 if (mddev->bitmap_file) {
4582 restore_bitmap_write_access(mddev->bitmap_file);
4583 fput(mddev->bitmap_file);
4585 mddev->bitmap_file = NULL;
4592 * set_array_info is used two different ways
4593 * The original usage is when creating a new array.
4594 * In this usage, raid_disks is > 0 and it together with
4595 * level, size, not_persistent,layout,chunksize determine the
4596 * shape of the array.
4597 * This will always create an array with a type-0.90.0 superblock.
4598 * The newer usage is when assembling an array.
4599 * In this case raid_disks will be 0, and the major_version field is
4600 * use to determine which style super-blocks are to be found on the devices.
4601 * The minor and patch _version numbers are also kept incase the
4602 * super_block handler wishes to interpret them.
4604 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
4607 if (info->raid_disks == 0) {
4608 /* just setting version number for superblock loading */
4609 if (info->major_version < 0 ||
4610 info->major_version >= ARRAY_SIZE(super_types) ||
4611 super_types[info->major_version].name == NULL) {
4612 /* maybe try to auto-load a module? */
4614 "md: superblock version %d not known\n",
4615 info->major_version);
4618 mddev->major_version = info->major_version;
4619 mddev->minor_version = info->minor_version;
4620 mddev->patch_version = info->patch_version;
4621 mddev->persistent = !info->not_persistent;
4624 mddev->major_version = MD_MAJOR_VERSION;
4625 mddev->minor_version = MD_MINOR_VERSION;
4626 mddev->patch_version = MD_PATCHLEVEL_VERSION;
4627 mddev->ctime = get_seconds();
4629 mddev->level = info->level;
4630 mddev->clevel[0] = 0;
4631 mddev->size = info->size;
4632 mddev->raid_disks = info->raid_disks;
4633 /* don't set md_minor, it is determined by which /dev/md* was
4636 if (info->state & (1<<MD_SB_CLEAN))
4637 mddev->recovery_cp = MaxSector;
4639 mddev->recovery_cp = 0;
4640 mddev->persistent = ! info->not_persistent;
4641 mddev->external = 0;
4643 mddev->layout = info->layout;
4644 mddev->chunk_size = info->chunk_size;
4646 mddev->max_disks = MD_SB_DISKS;
4648 if (mddev->persistent)
4650 set_bit(MD_CHANGE_DEVS, &mddev->flags);
4652 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
4653 mddev->bitmap_offset = 0;
4655 mddev->reshape_position = MaxSector;
4658 * Generate a 128 bit UUID
4660 get_random_bytes(mddev->uuid, 16);
4662 mddev->new_level = mddev->level;
4663 mddev->new_chunk = mddev->chunk_size;
4664 mddev->new_layout = mddev->layout;
4665 mddev->delta_disks = 0;
4670 static int update_size(mddev_t *mddev, sector_t num_sectors)
4674 int fit = (num_sectors == 0);
4676 if (mddev->pers->resize == NULL)
4678 /* The "num_sectors" is the number of sectors of each device that
4679 * is used. This can only make sense for arrays with redundancy.
4680 * linear and raid0 always use whatever space is available. We can only
4681 * consider changing this number if no resync or reconstruction is
4682 * happening, and if the new size is acceptable. It must fit before the
4683 * sb_start or, if that is <data_offset, it must fit before the size
4684 * of each device. If num_sectors is zero, we find the largest size
4688 if (mddev->sync_thread)
4691 /* Sorry, cannot grow a bitmap yet, just remove it,
4695 list_for_each_entry(rdev, &mddev->disks, same_set) {
4697 avail = rdev->size * 2;
4699 if (fit && (num_sectors == 0 || num_sectors > avail))
4700 num_sectors = avail;
4701 if (avail < num_sectors)
4704 rv = mddev->pers->resize(mddev, num_sectors);
4706 struct block_device *bdev;
4708 bdev = bdget_disk(mddev->gendisk, 0);
4710 mutex_lock(&bdev->bd_inode->i_mutex);
4711 i_size_write(bdev->bd_inode,
4712 (loff_t)mddev->array_sectors << 9);
4713 mutex_unlock(&bdev->bd_inode->i_mutex);
4720 static int update_raid_disks(mddev_t *mddev, int raid_disks)
4723 /* change the number of raid disks */
4724 if (mddev->pers->check_reshape == NULL)
4726 if (raid_disks <= 0 ||
4727 raid_disks >= mddev->max_disks)
4729 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
4731 mddev->delta_disks = raid_disks - mddev->raid_disks;
4733 rv = mddev->pers->check_reshape(mddev);
4739 * update_array_info is used to change the configuration of an
4741 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
4742 * fields in the info are checked against the array.
4743 * Any differences that cannot be handled will cause an error.
4744 * Normally, only one change can be managed at a time.
4746 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
4752 /* calculate expected state,ignoring low bits */
4753 if (mddev->bitmap && mddev->bitmap_offset)
4754 state |= (1 << MD_SB_BITMAP_PRESENT);
4756 if (mddev->major_version != info->major_version ||
4757 mddev->minor_version != info->minor_version ||
4758 /* mddev->patch_version != info->patch_version || */
4759 mddev->ctime != info->ctime ||
4760 mddev->level != info->level ||
4761 /* mddev->layout != info->layout || */
4762 !mddev->persistent != info->not_persistent||
4763 mddev->chunk_size != info->chunk_size ||
4764 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
4765 ((state^info->state) & 0xfffffe00)
4768 /* Check there is only one change */
4769 if (info->size >= 0 && mddev->size != info->size) cnt++;
4770 if (mddev->raid_disks != info->raid_disks) cnt++;
4771 if (mddev->layout != info->layout) cnt++;
4772 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
4773 if (cnt == 0) return 0;
4774 if (cnt > 1) return -EINVAL;
4776 if (mddev->layout != info->layout) {
4778 * we don't need to do anything at the md level, the
4779 * personality will take care of it all.
4781 if (mddev->pers->reconfig == NULL)
4784 return mddev->pers->reconfig(mddev, info->layout, -1);
4786 if (info->size >= 0 && mddev->size != info->size)
4787 rv = update_size(mddev, (sector_t)info->size * 2);
4789 if (mddev->raid_disks != info->raid_disks)
4790 rv = update_raid_disks(mddev, info->raid_disks);
4792 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
4793 if (mddev->pers->quiesce == NULL)
4795 if (mddev->recovery || mddev->sync_thread)
4797 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
4798 /* add the bitmap */
4801 if (mddev->default_bitmap_offset == 0)
4803 mddev->bitmap_offset = mddev->default_bitmap_offset;
4804 mddev->pers->quiesce(mddev, 1);
4805 rv = bitmap_create(mddev);
4807 bitmap_destroy(mddev);
4808 mddev->pers->quiesce(mddev, 0);
4810 /* remove the bitmap */
4813 if (mddev->bitmap->file)
4815 mddev->pers->quiesce(mddev, 1);
4816 bitmap_destroy(mddev);
4817 mddev->pers->quiesce(mddev, 0);
4818 mddev->bitmap_offset = 0;
4821 md_update_sb(mddev, 1);
4825 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
4829 if (mddev->pers == NULL)
4832 rdev = find_rdev(mddev, dev);
4836 md_error(mddev, rdev);
4841 * We have a problem here : there is no easy way to give a CHS
4842 * virtual geometry. We currently pretend that we have a 2 heads
4843 * 4 sectors (with a BIG number of cylinders...). This drives
4844 * dosfs just mad... ;-)
4846 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
4848 mddev_t *mddev = bdev->bd_disk->private_data;
4852 geo->cylinders = get_capacity(mddev->gendisk) / 8;
4856 static int md_ioctl(struct block_device *bdev, fmode_t mode,
4857 unsigned int cmd, unsigned long arg)
4860 void __user *argp = (void __user *)arg;
4861 mddev_t *mddev = NULL;
4863 if (!capable(CAP_SYS_ADMIN))
4867 * Commands dealing with the RAID driver but not any
4873 err = get_version(argp);
4876 case PRINT_RAID_DEBUG:
4884 autostart_arrays(arg);
4891 * Commands creating/starting a new array:
4894 mddev = bdev->bd_disk->private_data;
4901 err = mddev_lock(mddev);
4904 "md: ioctl lock interrupted, reason %d, cmd %d\n",
4911 case SET_ARRAY_INFO:
4913 mdu_array_info_t info;
4915 memset(&info, 0, sizeof(info));
4916 else if (copy_from_user(&info, argp, sizeof(info))) {
4921 err = update_array_info(mddev, &info);
4923 printk(KERN_WARNING "md: couldn't update"
4924 " array info. %d\n", err);
4929 if (!list_empty(&mddev->disks)) {
4931 "md: array %s already has disks!\n",
4936 if (mddev->raid_disks) {
4938 "md: array %s already initialised!\n",
4943 err = set_array_info(mddev, &info);
4945 printk(KERN_WARNING "md: couldn't set"
4946 " array info. %d\n", err);
4956 * Commands querying/configuring an existing array:
4958 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4959 * RUN_ARRAY, and GET_ and SET_BITMAP_FILE are allowed */
4960 if ((!mddev->raid_disks && !mddev->external)
4961 && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4962 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE
4963 && cmd != GET_BITMAP_FILE) {
4969 * Commands even a read-only array can execute:
4973 case GET_ARRAY_INFO:
4974 err = get_array_info(mddev, argp);
4977 case GET_BITMAP_FILE:
4978 err = get_bitmap_file(mddev, argp);
4982 err = get_disk_info(mddev, argp);
4985 case RESTART_ARRAY_RW:
4986 err = restart_array(mddev);
4990 err = do_md_stop(mddev, 0, 1);
4994 err = do_md_stop(mddev, 1, 1);
5000 * The remaining ioctls are changing the state of the
5001 * superblock, so we do not allow them on read-only arrays.
5002 * However non-MD ioctls (e.g. get-size) will still come through
5003 * here and hit the 'default' below, so only disallow
5004 * 'md' ioctls, and switch to rw mode if started auto-readonly.
5006 if (_IOC_TYPE(cmd) == MD_MAJOR && mddev->ro && mddev->pers) {
5007 if (mddev->ro == 2) {
5009 sysfs_notify_dirent(mddev->sysfs_state);
5010 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5011 md_wakeup_thread(mddev->thread);
5022 mdu_disk_info_t info;
5023 if (copy_from_user(&info, argp, sizeof(info)))
5026 err = add_new_disk(mddev, &info);
5030 case HOT_REMOVE_DISK:
5031 err = hot_remove_disk(mddev, new_decode_dev(arg));
5035 err = hot_add_disk(mddev, new_decode_dev(arg));
5038 case SET_DISK_FAULTY:
5039 err = set_disk_faulty(mddev, new_decode_dev(arg));
5043 err = do_md_run(mddev);
5046 case SET_BITMAP_FILE:
5047 err = set_bitmap_file(mddev, (int)arg);
5057 mddev_unlock(mddev);
5067 static int md_open(struct block_device *bdev, fmode_t mode)
5070 * Succeed if we can lock the mddev, which confirms that
5071 * it isn't being stopped right now.
5073 mddev_t *mddev = bdev->bd_disk->private_data;
5076 if ((err = mutex_lock_interruptible_nested(&mddev->reconfig_mutex, 1)))
5081 atomic_inc(&mddev->openers);
5082 mddev_unlock(mddev);
5084 check_disk_change(bdev);
5089 static int md_release(struct gendisk *disk, fmode_t mode)
5091 mddev_t *mddev = disk->private_data;
5094 atomic_dec(&mddev->openers);
5100 static int md_media_changed(struct gendisk *disk)
5102 mddev_t *mddev = disk->private_data;
5104 return mddev->changed;
5107 static int md_revalidate(struct gendisk *disk)
5109 mddev_t *mddev = disk->private_data;
5114 static struct block_device_operations md_fops =
5116 .owner = THIS_MODULE,
5118 .release = md_release,
5119 .locked_ioctl = md_ioctl,
5120 .getgeo = md_getgeo,
5121 .media_changed = md_media_changed,
5122 .revalidate_disk= md_revalidate,
5125 static int md_thread(void * arg)
5127 mdk_thread_t *thread = arg;
5130 * md_thread is a 'system-thread', it's priority should be very
5131 * high. We avoid resource deadlocks individually in each
5132 * raid personality. (RAID5 does preallocation) We also use RR and
5133 * the very same RT priority as kswapd, thus we will never get
5134 * into a priority inversion deadlock.
5136 * we definitely have to have equal or higher priority than
5137 * bdflush, otherwise bdflush will deadlock if there are too
5138 * many dirty RAID5 blocks.
5141 allow_signal(SIGKILL);
5142 while (!kthread_should_stop()) {
5144 /* We need to wait INTERRUPTIBLE so that
5145 * we don't add to the load-average.
5146 * That means we need to be sure no signals are
5149 if (signal_pending(current))
5150 flush_signals(current);
5152 wait_event_interruptible_timeout
5154 test_bit(THREAD_WAKEUP, &thread->flags)
5155 || kthread_should_stop(),
5158 clear_bit(THREAD_WAKEUP, &thread->flags);
5160 thread->run(thread->mddev);
5166 void md_wakeup_thread(mdk_thread_t *thread)
5169 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
5170 set_bit(THREAD_WAKEUP, &thread->flags);
5171 wake_up(&thread->wqueue);
5175 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
5178 mdk_thread_t *thread;
5180 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
5184 init_waitqueue_head(&thread->wqueue);
5187 thread->mddev = mddev;
5188 thread->timeout = MAX_SCHEDULE_TIMEOUT;
5189 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
5190 if (IS_ERR(thread->tsk)) {
5197 void md_unregister_thread(mdk_thread_t *thread)
5199 dprintk("interrupting MD-thread pid %d\n", task_pid_nr(thread->tsk));
5201 kthread_stop(thread->tsk);
5205 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
5212 if (!rdev || test_bit(Faulty, &rdev->flags))
5215 if (mddev->external)
5216 set_bit(Blocked, &rdev->flags);
5218 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
5220 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
5221 __builtin_return_address(0),__builtin_return_address(1),
5222 __builtin_return_address(2),__builtin_return_address(3));
5226 if (!mddev->pers->error_handler)
5228 mddev->pers->error_handler(mddev,rdev);
5229 if (mddev->degraded)
5230 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
5231 set_bit(StateChanged, &rdev->flags);
5232 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5233 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5234 md_wakeup_thread(mddev->thread);
5235 md_new_event_inintr(mddev);
5238 /* seq_file implementation /proc/mdstat */
5240 static void status_unused(struct seq_file *seq)
5245 seq_printf(seq, "unused devices: ");
5247 list_for_each_entry(rdev, &pending_raid_disks, same_set) {
5248 char b[BDEVNAME_SIZE];
5250 seq_printf(seq, "%s ",
5251 bdevname(rdev->bdev,b));
5254 seq_printf(seq, "<none>");
5256 seq_printf(seq, "\n");
5260 static void status_resync(struct seq_file *seq, mddev_t * mddev)
5262 sector_t max_blocks, resync, res;
5263 unsigned long dt, db, rt;
5265 unsigned int per_milli;
5267 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
5269 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5270 max_blocks = mddev->resync_max_sectors >> 1;
5272 max_blocks = mddev->size;
5275 * Should not happen.
5281 /* Pick 'scale' such that (resync>>scale)*1000 will fit
5282 * in a sector_t, and (max_blocks>>scale) will fit in a
5283 * u32, as those are the requirements for sector_div.
5284 * Thus 'scale' must be at least 10
5287 if (sizeof(sector_t) > sizeof(unsigned long)) {
5288 while ( max_blocks/2 > (1ULL<<(scale+32)))
5291 res = (resync>>scale)*1000;
5292 sector_div(res, (u32)((max_blocks>>scale)+1));
5296 int i, x = per_milli/50, y = 20-x;
5297 seq_printf(seq, "[");
5298 for (i = 0; i < x; i++)
5299 seq_printf(seq, "=");
5300 seq_printf(seq, ">");
5301 for (i = 0; i < y; i++)
5302 seq_printf(seq, ".");
5303 seq_printf(seq, "] ");
5305 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
5306 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
5308 (test_bit(MD_RECOVERY_CHECK, &mddev->recovery)?
5310 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
5311 "resync" : "recovery"))),
5312 per_milli/10, per_milli % 10,
5313 (unsigned long long) resync,
5314 (unsigned long long) max_blocks);
5317 * We do not want to overflow, so the order of operands and
5318 * the * 100 / 100 trick are important. We do a +1 to be
5319 * safe against division by zero. We only estimate anyway.
5321 * dt: time from mark until now
5322 * db: blocks written from mark until now
5323 * rt: remaining time
5325 dt = ((jiffies - mddev->resync_mark) / HZ);
5327 db = (mddev->curr_mark_cnt - atomic_read(&mddev->recovery_active))
5328 - mddev->resync_mark_cnt;
5329 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/2/100+1)))/100;
5331 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
5333 seq_printf(seq, " speed=%ldK/sec", db/2/dt);
5336 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
5338 struct list_head *tmp;
5348 spin_lock(&all_mddevs_lock);
5349 list_for_each(tmp,&all_mddevs)
5351 mddev = list_entry(tmp, mddev_t, all_mddevs);
5353 spin_unlock(&all_mddevs_lock);
5356 spin_unlock(&all_mddevs_lock);
5358 return (void*)2;/* tail */
5362 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
5364 struct list_head *tmp;
5365 mddev_t *next_mddev, *mddev = v;
5371 spin_lock(&all_mddevs_lock);
5373 tmp = all_mddevs.next;
5375 tmp = mddev->all_mddevs.next;
5376 if (tmp != &all_mddevs)
5377 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
5379 next_mddev = (void*)2;
5382 spin_unlock(&all_mddevs_lock);
5390 static void md_seq_stop(struct seq_file *seq, void *v)
5394 if (mddev && v != (void*)1 && v != (void*)2)
5398 struct mdstat_info {
5402 static int md_seq_show(struct seq_file *seq, void *v)
5407 struct mdstat_info *mi = seq->private;
5408 struct bitmap *bitmap;
5410 if (v == (void*)1) {
5411 struct mdk_personality *pers;
5412 seq_printf(seq, "Personalities : ");
5413 spin_lock(&pers_lock);
5414 list_for_each_entry(pers, &pers_list, list)
5415 seq_printf(seq, "[%s] ", pers->name);
5417 spin_unlock(&pers_lock);
5418 seq_printf(seq, "\n");
5419 mi->event = atomic_read(&md_event_count);
5422 if (v == (void*)2) {
5427 if (mddev_lock(mddev) < 0)
5430 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
5431 seq_printf(seq, "%s : %sactive", mdname(mddev),
5432 mddev->pers ? "" : "in");
5435 seq_printf(seq, " (read-only)");
5437 seq_printf(seq, " (auto-read-only)");
5438 seq_printf(seq, " %s", mddev->pers->name);
5442 list_for_each_entry(rdev, &mddev->disks, same_set) {
5443 char b[BDEVNAME_SIZE];
5444 seq_printf(seq, " %s[%d]",
5445 bdevname(rdev->bdev,b), rdev->desc_nr);
5446 if (test_bit(WriteMostly, &rdev->flags))
5447 seq_printf(seq, "(W)");
5448 if (test_bit(Faulty, &rdev->flags)) {
5449 seq_printf(seq, "(F)");
5451 } else if (rdev->raid_disk < 0)
5452 seq_printf(seq, "(S)"); /* spare */
5456 if (!list_empty(&mddev->disks)) {
5458 seq_printf(seq, "\n %llu blocks",
5459 (unsigned long long)
5460 mddev->array_sectors / 2);
5462 seq_printf(seq, "\n %llu blocks",
5463 (unsigned long long)size);
5465 if (mddev->persistent) {
5466 if (mddev->major_version != 0 ||
5467 mddev->minor_version != 90) {
5468 seq_printf(seq," super %d.%d",
5469 mddev->major_version,
5470 mddev->minor_version);
5472 } else if (mddev->external)
5473 seq_printf(seq, " super external:%s",
5474 mddev->metadata_type);
5476 seq_printf(seq, " super non-persistent");
5479 mddev->pers->status(seq, mddev);
5480 seq_printf(seq, "\n ");
5481 if (mddev->pers->sync_request) {
5482 if (mddev->curr_resync > 2) {
5483 status_resync(seq, mddev);
5484 seq_printf(seq, "\n ");
5485 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
5486 seq_printf(seq, "\tresync=DELAYED\n ");
5487 else if (mddev->recovery_cp < MaxSector)
5488 seq_printf(seq, "\tresync=PENDING\n ");
5491 seq_printf(seq, "\n ");
5493 if ((bitmap = mddev->bitmap)) {
5494 unsigned long chunk_kb;
5495 unsigned long flags;
5496 spin_lock_irqsave(&bitmap->lock, flags);
5497 chunk_kb = bitmap->chunksize >> 10;
5498 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
5500 bitmap->pages - bitmap->missing_pages,
5502 (bitmap->pages - bitmap->missing_pages)
5503 << (PAGE_SHIFT - 10),
5504 chunk_kb ? chunk_kb : bitmap->chunksize,
5505 chunk_kb ? "KB" : "B");
5507 seq_printf(seq, ", file: ");
5508 seq_path(seq, &bitmap->file->f_path, " \t\n");
5511 seq_printf(seq, "\n");
5512 spin_unlock_irqrestore(&bitmap->lock, flags);
5515 seq_printf(seq, "\n");
5517 mddev_unlock(mddev);
5522 static struct seq_operations md_seq_ops = {
5523 .start = md_seq_start,
5524 .next = md_seq_next,
5525 .stop = md_seq_stop,
5526 .show = md_seq_show,
5529 static int md_seq_open(struct inode *inode, struct file *file)
5532 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
5536 error = seq_open(file, &md_seq_ops);
5540 struct seq_file *p = file->private_data;
5542 mi->event = atomic_read(&md_event_count);
5547 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
5549 struct seq_file *m = filp->private_data;
5550 struct mdstat_info *mi = m->private;
5553 poll_wait(filp, &md_event_waiters, wait);
5555 /* always allow read */
5556 mask = POLLIN | POLLRDNORM;
5558 if (mi->event != atomic_read(&md_event_count))
5559 mask |= POLLERR | POLLPRI;
5563 static const struct file_operations md_seq_fops = {
5564 .owner = THIS_MODULE,
5565 .open = md_seq_open,
5567 .llseek = seq_lseek,
5568 .release = seq_release_private,
5569 .poll = mdstat_poll,
5572 int register_md_personality(struct mdk_personality *p)
5574 spin_lock(&pers_lock);
5575 list_add_tail(&p->list, &pers_list);
5576 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
5577 spin_unlock(&pers_lock);
5581 int unregister_md_personality(struct mdk_personality *p)
5583 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
5584 spin_lock(&pers_lock);
5585 list_del_init(&p->list);
5586 spin_unlock(&pers_lock);
5590 static int is_mddev_idle(mddev_t *mddev)
5598 rdev_for_each_rcu(rdev, mddev) {
5599 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
5600 curr_events = part_stat_read(&disk->part0, sectors[0]) +
5601 part_stat_read(&disk->part0, sectors[1]) -
5602 atomic_read(&disk->sync_io);
5603 /* sync IO will cause sync_io to increase before the disk_stats
5604 * as sync_io is counted when a request starts, and
5605 * disk_stats is counted when it completes.
5606 * So resync activity will cause curr_events to be smaller than
5607 * when there was no such activity.
5608 * non-sync IO will cause disk_stat to increase without
5609 * increasing sync_io so curr_events will (eventually)
5610 * be larger than it was before. Once it becomes
5611 * substantially larger, the test below will cause
5612 * the array to appear non-idle, and resync will slow
5614 * If there is a lot of outstanding resync activity when
5615 * we set last_event to curr_events, then all that activity
5616 * completing might cause the array to appear non-idle
5617 * and resync will be slowed down even though there might
5618 * not have been non-resync activity. This will only
5619 * happen once though. 'last_events' will soon reflect
5620 * the state where there is little or no outstanding
5621 * resync requests, and further resync activity will
5622 * always make curr_events less than last_events.
5625 if (curr_events - rdev->last_events > 4096) {
5626 rdev->last_events = curr_events;
5634 void md_done_sync(mddev_t *mddev, int blocks, int ok)
5636 /* another "blocks" (512byte) blocks have been synced */
5637 atomic_sub(blocks, &mddev->recovery_active);
5638 wake_up(&mddev->recovery_wait);
5640 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5641 md_wakeup_thread(mddev->thread);
5642 // stop recovery, signal do_sync ....
5647 /* md_write_start(mddev, bi)
5648 * If we need to update some array metadata (e.g. 'active' flag
5649 * in superblock) before writing, schedule a superblock update
5650 * and wait for it to complete.
5652 void md_write_start(mddev_t *mddev, struct bio *bi)
5655 if (bio_data_dir(bi) != WRITE)
5658 BUG_ON(mddev->ro == 1);
5659 if (mddev->ro == 2) {
5660 /* need to switch to read/write */
5662 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5663 md_wakeup_thread(mddev->thread);
5664 md_wakeup_thread(mddev->sync_thread);
5667 atomic_inc(&mddev->writes_pending);
5668 if (mddev->safemode == 1)
5669 mddev->safemode = 0;
5670 if (mddev->in_sync) {
5671 spin_lock_irq(&mddev->write_lock);
5672 if (mddev->in_sync) {
5674 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5675 md_wakeup_thread(mddev->thread);
5678 spin_unlock_irq(&mddev->write_lock);
5681 sysfs_notify_dirent(mddev->sysfs_state);
5682 wait_event(mddev->sb_wait,
5683 !test_bit(MD_CHANGE_CLEAN, &mddev->flags) &&
5684 !test_bit(MD_CHANGE_PENDING, &mddev->flags));
5687 void md_write_end(mddev_t *mddev)
5689 if (atomic_dec_and_test(&mddev->writes_pending)) {
5690 if (mddev->safemode == 2)
5691 md_wakeup_thread(mddev->thread);
5692 else if (mddev->safemode_delay)
5693 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
5697 /* md_allow_write(mddev)
5698 * Calling this ensures that the array is marked 'active' so that writes
5699 * may proceed without blocking. It is important to call this before
5700 * attempting a GFP_KERNEL allocation while holding the mddev lock.
5701 * Must be called with mddev_lock held.
5703 * In the ->external case MD_CHANGE_CLEAN can not be cleared until mddev->lock
5704 * is dropped, so return -EAGAIN after notifying userspace.
5706 int md_allow_write(mddev_t *mddev)
5712 if (!mddev->pers->sync_request)
5715 spin_lock_irq(&mddev->write_lock);
5716 if (mddev->in_sync) {
5718 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
5719 if (mddev->safemode_delay &&
5720 mddev->safemode == 0)
5721 mddev->safemode = 1;
5722 spin_unlock_irq(&mddev->write_lock);
5723 md_update_sb(mddev, 0);
5724 sysfs_notify_dirent(mddev->sysfs_state);
5726 spin_unlock_irq(&mddev->write_lock);
5728 if (test_bit(MD_CHANGE_CLEAN, &mddev->flags))
5733 EXPORT_SYMBOL_GPL(md_allow_write);
5735 #define SYNC_MARKS 10
5736 #define SYNC_MARK_STEP (3*HZ)
5737 void md_do_sync(mddev_t *mddev)
5740 unsigned int currspeed = 0,
5742 sector_t max_sectors,j, io_sectors;
5743 unsigned long mark[SYNC_MARKS];
5744 sector_t mark_cnt[SYNC_MARKS];
5746 struct list_head *tmp;
5747 sector_t last_check;
5752 /* just incase thread restarts... */
5753 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
5755 if (mddev->ro) /* never try to sync a read-only array */
5758 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5759 if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
5760 desc = "data-check";
5761 else if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5762 desc = "requested-resync";
5765 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5770 /* we overload curr_resync somewhat here.
5771 * 0 == not engaged in resync at all
5772 * 2 == checking that there is no conflict with another sync
5773 * 1 == like 2, but have yielded to allow conflicting resync to
5775 * other == active in resync - this many blocks
5777 * Before starting a resync we must have set curr_resync to
5778 * 2, and then checked that every "conflicting" array has curr_resync
5779 * less than ours. When we find one that is the same or higher
5780 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
5781 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
5782 * This will mean we have to start checking from the beginning again.
5787 mddev->curr_resync = 2;
5790 if (kthread_should_stop()) {
5791 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5794 for_each_mddev(mddev2, tmp) {
5795 if (mddev2 == mddev)
5797 if (!mddev->parallel_resync
5798 && mddev2->curr_resync
5799 && match_mddev_units(mddev, mddev2)) {
5801 if (mddev < mddev2 && mddev->curr_resync == 2) {
5802 /* arbitrarily yield */
5803 mddev->curr_resync = 1;
5804 wake_up(&resync_wait);
5806 if (mddev > mddev2 && mddev->curr_resync == 1)
5807 /* no need to wait here, we can wait the next
5808 * time 'round when curr_resync == 2
5811 /* We need to wait 'interruptible' so as not to
5812 * contribute to the load average, and not to
5813 * be caught by 'softlockup'
5815 prepare_to_wait(&resync_wait, &wq, TASK_INTERRUPTIBLE);
5816 if (!kthread_should_stop() &&
5817 mddev2->curr_resync >= mddev->curr_resync) {
5818 printk(KERN_INFO "md: delaying %s of %s"
5819 " until %s has finished (they"
5820 " share one or more physical units)\n",
5821 desc, mdname(mddev), mdname(mddev2));
5823 if (signal_pending(current))
5824 flush_signals(current);
5826 finish_wait(&resync_wait, &wq);
5829 finish_wait(&resync_wait, &wq);
5832 } while (mddev->curr_resync < 2);
5835 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5836 /* resync follows the size requested by the personality,
5837 * which defaults to physical size, but can be virtual size
5839 max_sectors = mddev->resync_max_sectors;
5840 mddev->resync_mismatches = 0;
5841 /* we don't use the checkpoint if there's a bitmap */
5842 if (test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
5843 j = mddev->resync_min;
5844 else if (!mddev->bitmap)
5845 j = mddev->recovery_cp;
5847 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
5848 max_sectors = mddev->size << 1;
5850 /* recovery follows the physical size of devices */
5851 max_sectors = mddev->size << 1;
5853 list_for_each_entry(rdev, &mddev->disks, same_set)
5854 if (rdev->raid_disk >= 0 &&
5855 !test_bit(Faulty, &rdev->flags) &&
5856 !test_bit(In_sync, &rdev->flags) &&
5857 rdev->recovery_offset < j)
5858 j = rdev->recovery_offset;
5861 printk(KERN_INFO "md: %s of RAID array %s\n", desc, mdname(mddev));
5862 printk(KERN_INFO "md: minimum _guaranteed_ speed:"
5863 " %d KB/sec/disk.\n", speed_min(mddev));
5864 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
5865 "(but not more than %d KB/sec) for %s.\n",
5866 speed_max(mddev), desc);
5868 is_mddev_idle(mddev); /* this also initializes IO event counters */
5871 for (m = 0; m < SYNC_MARKS; m++) {
5873 mark_cnt[m] = io_sectors;
5876 mddev->resync_mark = mark[last_mark];
5877 mddev->resync_mark_cnt = mark_cnt[last_mark];
5880 * Tune reconstruction:
5882 window = 32*(PAGE_SIZE/512);
5883 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
5884 window/2,(unsigned long long) max_sectors/2);
5886 atomic_set(&mddev->recovery_active, 0);
5891 "md: resuming %s of %s from checkpoint.\n",
5892 desc, mdname(mddev));
5893 mddev->curr_resync = j;
5896 while (j < max_sectors) {
5900 if (j >= mddev->resync_max) {
5901 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
5902 wait_event(mddev->recovery_wait,
5903 mddev->resync_max > j
5904 || kthread_should_stop());
5906 if (kthread_should_stop())
5908 sectors = mddev->pers->sync_request(mddev, j, &skipped,
5909 currspeed < speed_min(mddev));
5911 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
5915 if (!skipped) { /* actual IO requested */
5916 io_sectors += sectors;
5917 atomic_add(sectors, &mddev->recovery_active);
5921 if (j>1) mddev->curr_resync = j;
5922 mddev->curr_mark_cnt = io_sectors;
5923 if (last_check == 0)
5924 /* this is the earliers that rebuilt will be
5925 * visible in /proc/mdstat
5927 md_new_event(mddev);
5929 if (last_check + window > io_sectors || j == max_sectors)
5932 last_check = io_sectors;
5934 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery))
5938 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
5940 int next = (last_mark+1) % SYNC_MARKS;
5942 mddev->resync_mark = mark[next];
5943 mddev->resync_mark_cnt = mark_cnt[next];
5944 mark[next] = jiffies;
5945 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
5950 if (kthread_should_stop())
5955 * this loop exits only if either when we are slower than
5956 * the 'hard' speed limit, or the system was IO-idle for
5958 * the system might be non-idle CPU-wise, but we only care
5959 * about not overloading the IO subsystem. (things like an
5960 * e2fsck being done on the RAID array should execute fast)
5962 blk_unplug(mddev->queue);
5965 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
5966 /((jiffies-mddev->resync_mark)/HZ +1) +1;
5968 if (currspeed > speed_min(mddev)) {
5969 if ((currspeed > speed_max(mddev)) ||
5970 !is_mddev_idle(mddev)) {
5976 printk(KERN_INFO "md: %s: %s done.\n",mdname(mddev), desc);
5978 * this also signals 'finished resyncing' to md_stop
5981 blk_unplug(mddev->queue);
5983 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
5985 /* tell personality that we are finished */
5986 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
5988 if (!test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
5989 mddev->curr_resync > 2) {
5990 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
5991 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5992 if (mddev->curr_resync >= mddev->recovery_cp) {
5994 "md: checkpointing %s of %s.\n",
5995 desc, mdname(mddev));
5996 mddev->recovery_cp = mddev->curr_resync;
5999 mddev->recovery_cp = MaxSector;
6001 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
6002 mddev->curr_resync = MaxSector;
6003 list_for_each_entry(rdev, &mddev->disks, same_set)
6004 if (rdev->raid_disk >= 0 &&
6005 !test_bit(Faulty, &rdev->flags) &&
6006 !test_bit(In_sync, &rdev->flags) &&
6007 rdev->recovery_offset < mddev->curr_resync)
6008 rdev->recovery_offset = mddev->curr_resync;
6011 set_bit(MD_CHANGE_DEVS, &mddev->flags);
6014 mddev->curr_resync = 0;
6015 mddev->resync_min = 0;
6016 mddev->resync_max = MaxSector;
6017 sysfs_notify(&mddev->kobj, NULL, "sync_completed");
6018 wake_up(&resync_wait);
6019 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
6020 md_wakeup_thread(mddev->thread);
6025 * got a signal, exit.
6028 "md: md_do_sync() got signal ... exiting\n");
6029 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
6033 EXPORT_SYMBOL_GPL(md_do_sync);
6036 static int remove_and_add_spares(mddev_t *mddev)
6041 list_for_each_entry(rdev, &mddev->disks, same_set)
6042 if (rdev->raid_disk >= 0 &&
6043 !test_bit(Blocked, &rdev->flags) &&
6044 (test_bit(Faulty, &rdev->flags) ||
6045 ! test_bit(In_sync, &rdev->flags)) &&
6046 atomic_read(&rdev->nr_pending)==0) {
6047 if (mddev->pers->hot_remove_disk(
6048 mddev, rdev->raid_disk)==0) {
6050 sprintf(nm,"rd%d", rdev->raid_disk);
6051 sysfs_remove_link(&mddev->kobj, nm);
6052 rdev->raid_disk = -1;
6056 if (mddev->degraded && ! mddev->ro) {
6057 list_for_each_entry(rdev, &mddev->disks, same_set) {
6058 if (rdev->raid_disk >= 0 &&
6059 !test_bit(In_sync, &rdev->flags) &&
6060 !test_bit(Blocked, &rdev->flags))
6062 if (rdev->raid_disk < 0
6063 && !test_bit(Faulty, &rdev->flags)) {
6064 rdev->recovery_offset = 0;
6066 hot_add_disk(mddev, rdev) == 0) {
6068 sprintf(nm, "rd%d", rdev->raid_disk);
6069 if (sysfs_create_link(&mddev->kobj,
6072 "md: cannot register "
6076 md_new_event(mddev);
6085 * This routine is regularly called by all per-raid-array threads to
6086 * deal with generic issues like resync and super-block update.
6087 * Raid personalities that don't have a thread (linear/raid0) do not
6088 * need this as they never do any recovery or update the superblock.
6090 * It does not do any resync itself, but rather "forks" off other threads
6091 * to do that as needed.
6092 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
6093 * "->recovery" and create a thread at ->sync_thread.
6094 * When the thread finishes it sets MD_RECOVERY_DONE
6095 * and wakeups up this thread which will reap the thread and finish up.
6096 * This thread also removes any faulty devices (with nr_pending == 0).
6098 * The overall approach is:
6099 * 1/ if the superblock needs updating, update it.
6100 * 2/ If a recovery thread is running, don't do anything else.
6101 * 3/ If recovery has finished, clean up, possibly marking spares active.
6102 * 4/ If there are any faulty devices, remove them.
6103 * 5/ If array is degraded, try to add spares devices
6104 * 6/ If array has spares or is not in-sync, start a resync thread.
6106 void md_check_recovery(mddev_t *mddev)
6112 bitmap_daemon_work(mddev->bitmap);
6117 if (signal_pending(current)) {
6118 if (mddev->pers->sync_request && !mddev->external) {
6119 printk(KERN_INFO "md: %s in immediate safe mode\n",
6121 mddev->safemode = 2;
6123 flush_signals(current);
6126 if (mddev->ro && !test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
6129 (mddev->flags && !mddev->external) ||
6130 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
6131 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
6132 (mddev->external == 0 && mddev->safemode == 1) ||
6133 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
6134 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
6138 if (mddev_trylock(mddev)) {
6142 /* Only thing we do on a ro array is remove
6145 remove_and_add_spares(mddev);
6146 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6150 if (!mddev->external) {
6152 spin_lock_irq(&mddev->write_lock);
6153 if (mddev->safemode &&
6154 !atomic_read(&mddev->writes_pending) &&
6156 mddev->recovery_cp == MaxSector) {
6159 if (mddev->persistent)
6160 set_bit(MD_CHANGE_CLEAN, &mddev->flags);
6162 if (mddev->safemode == 1)
6163 mddev->safemode = 0;
6164 spin_unlock_irq(&mddev->write_lock);
6166 sysfs_notify_dirent(mddev->sysfs_state);
6170 md_update_sb(mddev, 0);
6172 list_for_each_entry(rdev, &mddev->disks, same_set)
6173 if (test_and_clear_bit(StateChanged, &rdev->flags))
6174 sysfs_notify_dirent(rdev->sysfs_state);
6177 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
6178 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
6179 /* resync/recovery still happening */
6180 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6183 if (mddev->sync_thread) {
6184 /* resync has finished, collect result */
6185 md_unregister_thread(mddev->sync_thread);
6186 mddev->sync_thread = NULL;
6187 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery) &&
6188 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery)) {
6190 /* activate any spares */
6191 if (mddev->pers->spare_active(mddev))
6192 sysfs_notify(&mddev->kobj, NULL,
6195 md_update_sb(mddev, 1);
6197 /* if array is no-longer degraded, then any saved_raid_disk
6198 * information must be scrapped
6200 if (!mddev->degraded)
6201 list_for_each_entry(rdev, &mddev->disks, same_set)
6202 rdev->saved_raid_disk = -1;
6204 mddev->recovery = 0;
6205 /* flag recovery needed just to double check */
6206 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6207 sysfs_notify_dirent(mddev->sysfs_action);
6208 md_new_event(mddev);
6211 /* Set RUNNING before clearing NEEDED to avoid
6212 * any transients in the value of "sync_action".
6214 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6215 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
6216 /* Clear some bits that don't mean anything, but
6219 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
6220 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
6222 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
6224 /* no recovery is running.
6225 * remove any failed drives, then
6226 * add spares if possible.
6227 * Spare are also removed and re-added, to allow
6228 * the personality to fail the re-add.
6231 if (mddev->reshape_position != MaxSector) {
6232 if (mddev->pers->check_reshape(mddev) != 0)
6233 /* Cannot proceed */
6235 set_bit(MD_RECOVERY_RESHAPE, &mddev->recovery);
6236 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6237 } else if ((spares = remove_and_add_spares(mddev))) {
6238 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6239 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
6240 clear_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
6241 set_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6242 } else if (mddev->recovery_cp < MaxSector) {
6243 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
6244 clear_bit(MD_RECOVERY_RECOVER, &mddev->recovery);
6245 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
6246 /* nothing to be done ... */
6249 if (mddev->pers->sync_request) {
6250 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
6251 /* We are adding a device or devices to an array
6252 * which has the bitmap stored on all devices.
6253 * So make sure all bitmap pages get written
6255 bitmap_write_all(mddev->bitmap);
6257 mddev->sync_thread = md_register_thread(md_do_sync,
6260 if (!mddev->sync_thread) {
6261 printk(KERN_ERR "%s: could not start resync"
6264 /* leave the spares where they are, it shouldn't hurt */
6265 mddev->recovery = 0;
6267 md_wakeup_thread(mddev->sync_thread);
6268 sysfs_notify_dirent(mddev->sysfs_action);
6269 md_new_event(mddev);
6272 if (!mddev->sync_thread) {
6273 clear_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
6274 if (test_and_clear_bit(MD_RECOVERY_RECOVER,
6276 if (mddev->sysfs_action)
6277 sysfs_notify_dirent(mddev->sysfs_action);
6279 mddev_unlock(mddev);
6283 void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev)
6285 sysfs_notify_dirent(rdev->sysfs_state);
6286 wait_event_timeout(rdev->blocked_wait,
6287 !test_bit(Blocked, &rdev->flags),
6288 msecs_to_jiffies(5000));
6289 rdev_dec_pending(rdev, mddev);
6291 EXPORT_SYMBOL(md_wait_for_blocked_rdev);
6293 static int md_notify_reboot(struct notifier_block *this,
6294 unsigned long code, void *x)
6296 struct list_head *tmp;
6299 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
6301 printk(KERN_INFO "md: stopping all md devices.\n");
6303 for_each_mddev(mddev, tmp)
6304 if (mddev_trylock(mddev)) {
6305 /* Force a switch to readonly even array
6306 * appears to still be in use. Hence
6309 do_md_stop(mddev, 1, 100);
6310 mddev_unlock(mddev);
6313 * certain more exotic SCSI devices are known to be
6314 * volatile wrt too early system reboots. While the
6315 * right place to handle this issue is the given
6316 * driver, we do want to have a safe RAID driver ...
6323 static struct notifier_block md_notifier = {
6324 .notifier_call = md_notify_reboot,
6326 .priority = INT_MAX, /* before any real devices */
6329 static void md_geninit(void)
6331 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
6333 proc_create("mdstat", S_IRUGO, NULL, &md_seq_fops);
6336 static int __init md_init(void)
6338 if (register_blkdev(MAJOR_NR, "md"))
6340 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
6341 unregister_blkdev(MAJOR_NR, "md");
6344 blk_register_region(MKDEV(MAJOR_NR, 0), 1UL<<MINORBITS, THIS_MODULE,
6345 md_probe, NULL, NULL);
6346 blk_register_region(MKDEV(mdp_major, 0), 1UL<<MINORBITS, THIS_MODULE,
6347 md_probe, NULL, NULL);
6349 register_reboot_notifier(&md_notifier);
6350 raid_table_header = register_sysctl_table(raid_root_table);
6360 * Searches all registered partitions for autorun RAID arrays
6364 static LIST_HEAD(all_detected_devices);
6365 struct detected_devices_node {
6366 struct list_head list;
6370 void md_autodetect_dev(dev_t dev)
6372 struct detected_devices_node *node_detected_dev;
6374 node_detected_dev = kzalloc(sizeof(*node_detected_dev), GFP_KERNEL);
6375 if (node_detected_dev) {
6376 node_detected_dev->dev = dev;
6377 list_add_tail(&node_detected_dev->list, &all_detected_devices);
6379 printk(KERN_CRIT "md: md_autodetect_dev: kzalloc failed"
6380 ", skipping dev(%d,%d)\n", MAJOR(dev), MINOR(dev));
6385 static void autostart_arrays(int part)
6388 struct detected_devices_node *node_detected_dev;
6390 int i_scanned, i_passed;
6395 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
6397 while (!list_empty(&all_detected_devices) && i_scanned < INT_MAX) {
6399 node_detected_dev = list_entry(all_detected_devices.next,
6400 struct detected_devices_node, list);
6401 list_del(&node_detected_dev->list);
6402 dev = node_detected_dev->dev;
6403 kfree(node_detected_dev);
6404 rdev = md_import_device(dev,0, 90);
6408 if (test_bit(Faulty, &rdev->flags)) {
6412 set_bit(AutoDetected, &rdev->flags);
6413 list_add(&rdev->same_set, &pending_raid_disks);
6417 printk(KERN_INFO "md: Scanned %d and added %d devices.\n",
6418 i_scanned, i_passed);
6420 autorun_devices(part);
6423 #endif /* !MODULE */
6425 static __exit void md_exit(void)
6428 struct list_head *tmp;
6430 blk_unregister_region(MKDEV(MAJOR_NR,0), 1U << MINORBITS);
6431 blk_unregister_region(MKDEV(mdp_major,0), 1U << MINORBITS);
6433 unregister_blkdev(MAJOR_NR,"md");
6434 unregister_blkdev(mdp_major, "mdp");
6435 unregister_reboot_notifier(&md_notifier);
6436 unregister_sysctl_table(raid_table_header);
6437 remove_proc_entry("mdstat", NULL);
6438 for_each_mddev(mddev, tmp) {
6439 struct gendisk *disk = mddev->gendisk;
6442 export_array(mddev);
6447 subsys_initcall(md_init);
6448 module_exit(md_exit)
6450 static int get_ro(char *buffer, struct kernel_param *kp)
6452 return sprintf(buffer, "%d", start_readonly);
6454 static int set_ro(const char *val, struct kernel_param *kp)
6457 int num = simple_strtoul(val, &e, 10);
6458 if (*val && (*e == '\0' || *e == '\n')) {
6459 start_readonly = num;
6465 module_param_call(start_ro, set_ro, get_ro, NULL, S_IRUSR|S_IWUSR);
6466 module_param(start_dirty_degraded, int, S_IRUGO|S_IWUSR);
6469 EXPORT_SYMBOL(register_md_personality);
6470 EXPORT_SYMBOL(unregister_md_personality);
6471 EXPORT_SYMBOL(md_error);
6472 EXPORT_SYMBOL(md_done_sync);
6473 EXPORT_SYMBOL(md_write_start);
6474 EXPORT_SYMBOL(md_write_end);
6475 EXPORT_SYMBOL(md_register_thread);
6476 EXPORT_SYMBOL(md_unregister_thread);
6477 EXPORT_SYMBOL(md_wakeup_thread);
6478 EXPORT_SYMBOL(md_check_recovery);
6479 MODULE_LICENSE("GPL");
6481 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);