2 md.c : Multiple Devices driver for Linux
3 Copyright (C) 1998, 1999, 2000 Ingo Molnar
5 completely rewritten, based on the MD driver code from Marc Zyngier
9 - RAID-1/RAID-5 extensions by Miguel de Icaza, Gadi Oxman, Ingo Molnar
10 - RAID-6 extensions by H. Peter Anvin <hpa@zytor.com>
11 - boot support for linear and striped mode by Harald Hoyer <HarryH@Royal.Net>
12 - kerneld support by Boris Tobotras <boris@xtalk.msk.su>
13 - kmod support by: Cyrus Durgin
14 - RAID0 bugfixes: Mark Anthony Lisher <markal@iname.com>
15 - Devfs support by Richard Gooch <rgooch@atnf.csiro.au>
17 - lots of fixes and improvements to the RAID1/RAID5 and generic
18 RAID code (such as request based resynchronization):
20 Neil Brown <neilb@cse.unsw.edu.au>.
22 - persistent bitmap code
23 Copyright (C) 2003-2004, Paul Clements, SteelEye Technology, Inc.
25 This program is free software; you can redistribute it and/or modify
26 it under the terms of the GNU General Public License as published by
27 the Free Software Foundation; either version 2, or (at your option)
30 You should have received a copy of the GNU General Public License
31 (for example /usr/src/linux/COPYING); if not, write to the Free
32 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
35 #include <linux/module.h>
36 #include <linux/config.h>
37 #include <linux/kthread.h>
38 #include <linux/linkage.h>
39 #include <linux/raid/md.h>
40 #include <linux/raid/bitmap.h>
41 #include <linux/sysctl.h>
42 #include <linux/devfs_fs_kernel.h>
43 #include <linux/buffer_head.h> /* for invalidate_bdev */
44 #include <linux/suspend.h>
45 #include <linux/poll.h>
47 #include <linux/init.h>
49 #include <linux/file.h>
52 #include <linux/kmod.h>
55 #include <asm/unaligned.h>
57 #define MAJOR_NR MD_MAJOR
60 /* 63 partitions with the alternate major number (mdp) */
61 #define MdpMinorShift 6
64 #define dprintk(x...) ((void)(DEBUG && printk(x)))
68 static void autostart_arrays (int part);
71 static LIST_HEAD(pers_list);
72 static DEFINE_SPINLOCK(pers_lock);
75 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
76 * is 1000 KB/sec, so the extra system load does not show up that much.
77 * Increase it if you want to have more _guaranteed_ speed. Note that
78 * the RAID driver will use the maximum available bandwidth if the IO
79 * subsystem is idle. There is also an 'absolute maximum' reconstruction
80 * speed limit - in case reconstruction slows down your system despite
83 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
84 * or /sys/block/mdX/md/sync_speed_{min,max}
87 static int sysctl_speed_limit_min = 1000;
88 static int sysctl_speed_limit_max = 200000;
89 static inline int speed_min(mddev_t *mddev)
91 return mddev->sync_speed_min ?
92 mddev->sync_speed_min : sysctl_speed_limit_min;
95 static inline int speed_max(mddev_t *mddev)
97 return mddev->sync_speed_max ?
98 mddev->sync_speed_max : sysctl_speed_limit_max;
101 static struct ctl_table_header *raid_table_header;
103 static ctl_table raid_table[] = {
105 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
106 .procname = "speed_limit_min",
107 .data = &sysctl_speed_limit_min,
108 .maxlen = sizeof(int),
110 .proc_handler = &proc_dointvec,
113 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
114 .procname = "speed_limit_max",
115 .data = &sysctl_speed_limit_max,
116 .maxlen = sizeof(int),
118 .proc_handler = &proc_dointvec,
123 static ctl_table raid_dir_table[] = {
125 .ctl_name = DEV_RAID,
134 static ctl_table raid_root_table[] = {
140 .child = raid_dir_table,
145 static struct block_device_operations md_fops;
147 static int start_readonly;
150 * We have a system wide 'event count' that is incremented
151 * on any 'interesting' event, and readers of /proc/mdstat
152 * can use 'poll' or 'select' to find out when the event
156 * start array, stop array, error, add device, remove device,
157 * start build, activate spare
159 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
160 static atomic_t md_event_count;
161 static void md_new_event(mddev_t *mddev)
163 atomic_inc(&md_event_count);
164 wake_up(&md_event_waiters);
168 * Enables to iterate over all existing md arrays
169 * all_mddevs_lock protects this list.
171 static LIST_HEAD(all_mddevs);
172 static DEFINE_SPINLOCK(all_mddevs_lock);
176 * iterates through all used mddevs in the system.
177 * We take care to grab the all_mddevs_lock whenever navigating
178 * the list, and to always hold a refcount when unlocked.
179 * Any code which breaks out of this loop while own
180 * a reference to the current mddev and must mddev_put it.
182 #define ITERATE_MDDEV(mddev,tmp) \
184 for (({ spin_lock(&all_mddevs_lock); \
185 tmp = all_mddevs.next; \
187 ({ if (tmp != &all_mddevs) \
188 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
189 spin_unlock(&all_mddevs_lock); \
190 if (mddev) mddev_put(mddev); \
191 mddev = list_entry(tmp, mddev_t, all_mddevs); \
192 tmp != &all_mddevs;}); \
193 ({ spin_lock(&all_mddevs_lock); \
198 static int md_fail_request (request_queue_t *q, struct bio *bio)
200 bio_io_error(bio, bio->bi_size);
204 static inline mddev_t *mddev_get(mddev_t *mddev)
206 atomic_inc(&mddev->active);
210 static void mddev_put(mddev_t *mddev)
212 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
214 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
215 list_del(&mddev->all_mddevs);
217 blk_cleanup_queue(mddev->queue);
218 /* that also blocks */
219 kobject_unregister(&mddev->kobj);
220 /* result blows... */
222 spin_unlock(&all_mddevs_lock);
225 static mddev_t * mddev_find(dev_t unit)
227 mddev_t *mddev, *new = NULL;
230 spin_lock(&all_mddevs_lock);
231 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
232 if (mddev->unit == unit) {
234 spin_unlock(&all_mddevs_lock);
240 list_add(&new->all_mddevs, &all_mddevs);
241 spin_unlock(&all_mddevs_lock);
244 spin_unlock(&all_mddevs_lock);
246 new = kzalloc(sizeof(*new), GFP_KERNEL);
251 if (MAJOR(unit) == MD_MAJOR)
252 new->md_minor = MINOR(unit);
254 new->md_minor = MINOR(unit) >> MdpMinorShift;
256 init_MUTEX(&new->reconfig_sem);
257 INIT_LIST_HEAD(&new->disks);
258 INIT_LIST_HEAD(&new->all_mddevs);
259 init_timer(&new->safemode_timer);
260 atomic_set(&new->active, 1);
261 spin_lock_init(&new->write_lock);
262 init_waitqueue_head(&new->sb_wait);
264 new->queue = blk_alloc_queue(GFP_KERNEL);
269 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
271 blk_queue_make_request(new->queue, md_fail_request);
276 static inline int mddev_lock(mddev_t * mddev)
278 return down_interruptible(&mddev->reconfig_sem);
281 static inline void mddev_lock_uninterruptible(mddev_t * mddev)
283 down(&mddev->reconfig_sem);
286 static inline int mddev_trylock(mddev_t * mddev)
288 return down_trylock(&mddev->reconfig_sem);
291 static inline void mddev_unlock(mddev_t * mddev)
293 up(&mddev->reconfig_sem);
295 md_wakeup_thread(mddev->thread);
298 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
301 struct list_head *tmp;
303 ITERATE_RDEV(mddev,rdev,tmp) {
304 if (rdev->desc_nr == nr)
310 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
312 struct list_head *tmp;
315 ITERATE_RDEV(mddev,rdev,tmp) {
316 if (rdev->bdev->bd_dev == dev)
322 static struct mdk_personality *find_pers(int level, char *clevel)
324 struct mdk_personality *pers;
325 list_for_each_entry(pers, &pers_list, list) {
326 if (level != LEVEL_NONE && pers->level == level)
328 if (strcmp(pers->name, clevel)==0)
334 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
336 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
337 return MD_NEW_SIZE_BLOCKS(size);
340 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
344 size = rdev->sb_offset;
347 size &= ~((sector_t)chunk_size/1024 - 1);
351 static int alloc_disk_sb(mdk_rdev_t * rdev)
356 rdev->sb_page = alloc_page(GFP_KERNEL);
357 if (!rdev->sb_page) {
358 printk(KERN_ALERT "md: out of memory.\n");
365 static void free_disk_sb(mdk_rdev_t * rdev)
368 put_page(rdev->sb_page);
370 rdev->sb_page = NULL;
377 static int super_written(struct bio *bio, unsigned int bytes_done, int error)
379 mdk_rdev_t *rdev = bio->bi_private;
380 mddev_t *mddev = rdev->mddev;
384 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
385 md_error(mddev, rdev);
387 if (atomic_dec_and_test(&mddev->pending_writes))
388 wake_up(&mddev->sb_wait);
393 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
395 struct bio *bio2 = bio->bi_private;
396 mdk_rdev_t *rdev = bio2->bi_private;
397 mddev_t *mddev = rdev->mddev;
401 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
402 error == -EOPNOTSUPP) {
404 /* barriers don't appear to be supported :-( */
405 set_bit(BarriersNotsupp, &rdev->flags);
406 mddev->barriers_work = 0;
407 spin_lock_irqsave(&mddev->write_lock, flags);
408 bio2->bi_next = mddev->biolist;
409 mddev->biolist = bio2;
410 spin_unlock_irqrestore(&mddev->write_lock, flags);
411 wake_up(&mddev->sb_wait);
416 bio->bi_private = rdev;
417 return super_written(bio, bytes_done, error);
420 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
421 sector_t sector, int size, struct page *page)
423 /* write first size bytes of page to sector of rdev
424 * Increment mddev->pending_writes before returning
425 * and decrement it on completion, waking up sb_wait
426 * if zero is reached.
427 * If an error occurred, call md_error
429 * As we might need to resubmit the request if BIO_RW_BARRIER
430 * causes ENOTSUPP, we allocate a spare bio...
432 struct bio *bio = bio_alloc(GFP_NOIO, 1);
433 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
435 bio->bi_bdev = rdev->bdev;
436 bio->bi_sector = sector;
437 bio_add_page(bio, page, size, 0);
438 bio->bi_private = rdev;
439 bio->bi_end_io = super_written;
442 atomic_inc(&mddev->pending_writes);
443 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
445 rw |= (1<<BIO_RW_BARRIER);
446 rbio = bio_clone(bio, GFP_NOIO);
447 rbio->bi_private = bio;
448 rbio->bi_end_io = super_written_barrier;
449 submit_bio(rw, rbio);
454 void md_super_wait(mddev_t *mddev)
456 /* wait for all superblock writes that were scheduled to complete.
457 * if any had to be retried (due to BARRIER problems), retry them
461 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
462 if (atomic_read(&mddev->pending_writes)==0)
464 while (mddev->biolist) {
466 spin_lock_irq(&mddev->write_lock);
467 bio = mddev->biolist;
468 mddev->biolist = bio->bi_next ;
470 spin_unlock_irq(&mddev->write_lock);
471 submit_bio(bio->bi_rw, bio);
475 finish_wait(&mddev->sb_wait, &wq);
478 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
483 complete((struct completion*)bio->bi_private);
487 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
488 struct page *page, int rw)
490 struct bio *bio = bio_alloc(GFP_NOIO, 1);
491 struct completion event;
494 rw |= (1 << BIO_RW_SYNC);
497 bio->bi_sector = sector;
498 bio_add_page(bio, page, size, 0);
499 init_completion(&event);
500 bio->bi_private = &event;
501 bio->bi_end_io = bi_complete;
503 wait_for_completion(&event);
505 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
509 EXPORT_SYMBOL_GPL(sync_page_io);
511 static int read_disk_sb(mdk_rdev_t * rdev, int size)
513 char b[BDEVNAME_SIZE];
514 if (!rdev->sb_page) {
522 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
528 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
529 bdevname(rdev->bdev,b));
533 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
535 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
536 (sb1->set_uuid1 == sb2->set_uuid1) &&
537 (sb1->set_uuid2 == sb2->set_uuid2) &&
538 (sb1->set_uuid3 == sb2->set_uuid3))
546 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
549 mdp_super_t *tmp1, *tmp2;
551 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
552 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
554 if (!tmp1 || !tmp2) {
556 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
564 * nr_disks is not constant
569 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
580 static unsigned int calc_sb_csum(mdp_super_t * sb)
582 unsigned int disk_csum, csum;
584 disk_csum = sb->sb_csum;
586 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
587 sb->sb_csum = disk_csum;
593 * Handle superblock details.
594 * We want to be able to handle multiple superblock formats
595 * so we have a common interface to them all, and an array of
596 * different handlers.
597 * We rely on user-space to write the initial superblock, and support
598 * reading and updating of superblocks.
599 * Interface methods are:
600 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
601 * loads and validates a superblock on dev.
602 * if refdev != NULL, compare superblocks on both devices
604 * 0 - dev has a superblock that is compatible with refdev
605 * 1 - dev has a superblock that is compatible and newer than refdev
606 * so dev should be used as the refdev in future
607 * -EINVAL superblock incompatible or invalid
608 * -othererror e.g. -EIO
610 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
611 * Verify that dev is acceptable into mddev.
612 * The first time, mddev->raid_disks will be 0, and data from
613 * dev should be merged in. Subsequent calls check that dev
614 * is new enough. Return 0 or -EINVAL
616 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
617 * Update the superblock for rdev with data in mddev
618 * This does not write to disc.
624 struct module *owner;
625 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
626 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
627 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
631 * load_super for 0.90.0
633 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
635 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
641 * Calculate the position of the superblock,
642 * it's at the end of the disk.
644 * It also happens to be a multiple of 4Kb.
646 sb_offset = calc_dev_sboffset(rdev->bdev);
647 rdev->sb_offset = sb_offset;
649 ret = read_disk_sb(rdev, MD_SB_BYTES);
654 bdevname(rdev->bdev, b);
655 sb = (mdp_super_t*)page_address(rdev->sb_page);
657 if (sb->md_magic != MD_SB_MAGIC) {
658 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
663 if (sb->major_version != 0 ||
664 sb->minor_version != 90) {
665 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
666 sb->major_version, sb->minor_version,
671 if (sb->raid_disks <= 0)
674 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
675 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
680 rdev->preferred_minor = sb->md_minor;
681 rdev->data_offset = 0;
682 rdev->sb_size = MD_SB_BYTES;
684 if (sb->level == LEVEL_MULTIPATH)
687 rdev->desc_nr = sb->this_disk.number;
693 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
694 if (!uuid_equal(refsb, sb)) {
695 printk(KERN_WARNING "md: %s has different UUID to %s\n",
696 b, bdevname(refdev->bdev,b2));
699 if (!sb_equal(refsb, sb)) {
700 printk(KERN_WARNING "md: %s has same UUID"
701 " but different superblock to %s\n",
702 b, bdevname(refdev->bdev, b2));
706 ev2 = md_event(refsb);
712 rdev->size = calc_dev_size(rdev, sb->chunk_size);
714 if (rdev->size < sb->size && sb->level > 1)
715 /* "this cannot possibly happen" ... */
723 * validate_super for 0.90.0
725 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
728 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
730 rdev->raid_disk = -1;
732 if (mddev->raid_disks == 0) {
733 mddev->major_version = 0;
734 mddev->minor_version = sb->minor_version;
735 mddev->patch_version = sb->patch_version;
736 mddev->persistent = ! sb->not_persistent;
737 mddev->chunk_size = sb->chunk_size;
738 mddev->ctime = sb->ctime;
739 mddev->utime = sb->utime;
740 mddev->level = sb->level;
741 mddev->clevel[0] = 0;
742 mddev->layout = sb->layout;
743 mddev->raid_disks = sb->raid_disks;
744 mddev->size = sb->size;
745 mddev->events = md_event(sb);
746 mddev->bitmap_offset = 0;
747 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
749 if (sb->state & (1<<MD_SB_CLEAN))
750 mddev->recovery_cp = MaxSector;
752 if (sb->events_hi == sb->cp_events_hi &&
753 sb->events_lo == sb->cp_events_lo) {
754 mddev->recovery_cp = sb->recovery_cp;
756 mddev->recovery_cp = 0;
759 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
760 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
761 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
762 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
764 mddev->max_disks = MD_SB_DISKS;
766 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
767 mddev->bitmap_file == NULL) {
768 if (mddev->level != 1 && mddev->level != 4
769 && mddev->level != 5 && mddev->level != 6
770 && mddev->level != 10) {
771 /* FIXME use a better test */
772 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
775 mddev->bitmap_offset = mddev->default_bitmap_offset;
778 } else if (mddev->pers == NULL) {
779 /* Insist on good event counter while assembling */
780 __u64 ev1 = md_event(sb);
782 if (ev1 < mddev->events)
784 } else if (mddev->bitmap) {
785 /* if adding to array with a bitmap, then we can accept an
786 * older device ... but not too old.
788 __u64 ev1 = md_event(sb);
789 if (ev1 < mddev->bitmap->events_cleared)
791 } else /* just a hot-add of a new device, leave raid_disk at -1 */
794 if (mddev->level != LEVEL_MULTIPATH) {
795 desc = sb->disks + rdev->desc_nr;
797 if (desc->state & (1<<MD_DISK_FAULTY))
798 set_bit(Faulty, &rdev->flags);
799 else if (desc->state & (1<<MD_DISK_SYNC) &&
800 desc->raid_disk < mddev->raid_disks) {
801 set_bit(In_sync, &rdev->flags);
802 rdev->raid_disk = desc->raid_disk;
804 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
805 set_bit(WriteMostly, &rdev->flags);
806 } else /* MULTIPATH are always insync */
807 set_bit(In_sync, &rdev->flags);
812 * sync_super for 0.90.0
814 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
817 struct list_head *tmp;
819 int next_spare = mddev->raid_disks;
822 /* make rdev->sb match mddev data..
825 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
826 * 3/ any empty disks < next_spare become removed
828 * disks[0] gets initialised to REMOVED because
829 * we cannot be sure from other fields if it has
830 * been initialised or not.
833 int active=0, working=0,failed=0,spare=0,nr_disks=0;
835 rdev->sb_size = MD_SB_BYTES;
837 sb = (mdp_super_t*)page_address(rdev->sb_page);
839 memset(sb, 0, sizeof(*sb));
841 sb->md_magic = MD_SB_MAGIC;
842 sb->major_version = mddev->major_version;
843 sb->minor_version = mddev->minor_version;
844 sb->patch_version = mddev->patch_version;
845 sb->gvalid_words = 0; /* ignored */
846 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
847 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
848 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
849 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
851 sb->ctime = mddev->ctime;
852 sb->level = mddev->level;
853 sb->size = mddev->size;
854 sb->raid_disks = mddev->raid_disks;
855 sb->md_minor = mddev->md_minor;
856 sb->not_persistent = !mddev->persistent;
857 sb->utime = mddev->utime;
859 sb->events_hi = (mddev->events>>32);
860 sb->events_lo = (u32)mddev->events;
864 sb->recovery_cp = mddev->recovery_cp;
865 sb->cp_events_hi = (mddev->events>>32);
866 sb->cp_events_lo = (u32)mddev->events;
867 if (mddev->recovery_cp == MaxSector)
868 sb->state = (1<< MD_SB_CLEAN);
872 sb->layout = mddev->layout;
873 sb->chunk_size = mddev->chunk_size;
875 if (mddev->bitmap && mddev->bitmap_file == NULL)
876 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
878 sb->disks[0].state = (1<<MD_DISK_REMOVED);
879 ITERATE_RDEV(mddev,rdev2,tmp) {
882 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
883 && !test_bit(Faulty, &rdev2->flags))
884 desc_nr = rdev2->raid_disk;
886 desc_nr = next_spare++;
887 rdev2->desc_nr = desc_nr;
888 d = &sb->disks[rdev2->desc_nr];
890 d->number = rdev2->desc_nr;
891 d->major = MAJOR(rdev2->bdev->bd_dev);
892 d->minor = MINOR(rdev2->bdev->bd_dev);
893 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
894 && !test_bit(Faulty, &rdev2->flags))
895 d->raid_disk = rdev2->raid_disk;
897 d->raid_disk = rdev2->desc_nr; /* compatibility */
898 if (test_bit(Faulty, &rdev2->flags))
899 d->state = (1<<MD_DISK_FAULTY);
900 else if (test_bit(In_sync, &rdev2->flags)) {
901 d->state = (1<<MD_DISK_ACTIVE);
902 d->state |= (1<<MD_DISK_SYNC);
910 if (test_bit(WriteMostly, &rdev2->flags))
911 d->state |= (1<<MD_DISK_WRITEMOSTLY);
913 /* now set the "removed" and "faulty" bits on any missing devices */
914 for (i=0 ; i < mddev->raid_disks ; i++) {
915 mdp_disk_t *d = &sb->disks[i];
916 if (d->state == 0 && d->number == 0) {
919 d->state = (1<<MD_DISK_REMOVED);
920 d->state |= (1<<MD_DISK_FAULTY);
924 sb->nr_disks = nr_disks;
925 sb->active_disks = active;
926 sb->working_disks = working;
927 sb->failed_disks = failed;
928 sb->spare_disks = spare;
930 sb->this_disk = sb->disks[rdev->desc_nr];
931 sb->sb_csum = calc_sb_csum(sb);
935 * version 1 superblock
938 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
940 unsigned int disk_csum, csum;
941 unsigned long long newcsum;
942 int size = 256 + le32_to_cpu(sb->max_dev)*2;
943 unsigned int *isuper = (unsigned int*)sb;
946 disk_csum = sb->sb_csum;
949 for (i=0; size>=4; size -= 4 )
950 newcsum += le32_to_cpu(*isuper++);
953 newcsum += le16_to_cpu(*(unsigned short*) isuper);
955 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
956 sb->sb_csum = disk_csum;
957 return cpu_to_le32(csum);
960 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
962 struct mdp_superblock_1 *sb;
965 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
969 * Calculate the position of the superblock.
970 * It is always aligned to a 4K boundary and
971 * depeding on minor_version, it can be:
972 * 0: At least 8K, but less than 12K, from end of device
973 * 1: At start of device
974 * 2: 4K from start of device.
976 switch(minor_version) {
978 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
980 sb_offset &= ~(sector_t)(4*2-1);
981 /* convert from sectors to K */
993 rdev->sb_offset = sb_offset;
995 /* superblock is rarely larger than 1K, but it can be larger,
996 * and it is safe to read 4k, so we do that
998 ret = read_disk_sb(rdev, 4096);
1002 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1004 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1005 sb->major_version != cpu_to_le32(1) ||
1006 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1007 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1008 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1011 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1012 printk("md: invalid superblock checksum on %s\n",
1013 bdevname(rdev->bdev,b));
1016 if (le64_to_cpu(sb->data_size) < 10) {
1017 printk("md: data_size too small on %s\n",
1018 bdevname(rdev->bdev,b));
1021 rdev->preferred_minor = 0xffff;
1022 rdev->data_offset = le64_to_cpu(sb->data_offset);
1023 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1025 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1026 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1027 if (rdev->sb_size & bmask)
1028 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1034 struct mdp_superblock_1 *refsb =
1035 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1037 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1038 sb->level != refsb->level ||
1039 sb->layout != refsb->layout ||
1040 sb->chunksize != refsb->chunksize) {
1041 printk(KERN_WARNING "md: %s has strangely different"
1042 " superblock to %s\n",
1043 bdevname(rdev->bdev,b),
1044 bdevname(refdev->bdev,b2));
1047 ev1 = le64_to_cpu(sb->events);
1048 ev2 = le64_to_cpu(refsb->events);
1056 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1058 rdev->size = rdev->sb_offset;
1059 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1061 rdev->size = le64_to_cpu(sb->data_size)/2;
1062 if (le32_to_cpu(sb->chunksize))
1063 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1065 if (le32_to_cpu(sb->size) > rdev->size*2)
1070 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1072 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1074 rdev->raid_disk = -1;
1076 if (mddev->raid_disks == 0) {
1077 mddev->major_version = 1;
1078 mddev->patch_version = 0;
1079 mddev->persistent = 1;
1080 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1081 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1082 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1083 mddev->level = le32_to_cpu(sb->level);
1084 mddev->clevel[0] = 0;
1085 mddev->layout = le32_to_cpu(sb->layout);
1086 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1087 mddev->size = le64_to_cpu(sb->size)/2;
1088 mddev->events = le64_to_cpu(sb->events);
1089 mddev->bitmap_offset = 0;
1090 mddev->default_bitmap_offset = 1024 >> 9;
1092 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1093 memcpy(mddev->uuid, sb->set_uuid, 16);
1095 mddev->max_disks = (4096-256)/2;
1097 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1098 mddev->bitmap_file == NULL ) {
1099 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1100 && mddev->level != 10) {
1101 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
1104 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1106 } else if (mddev->pers == NULL) {
1107 /* Insist of good event counter while assembling */
1108 __u64 ev1 = le64_to_cpu(sb->events);
1110 if (ev1 < mddev->events)
1112 } else if (mddev->bitmap) {
1113 /* If adding to array with a bitmap, then we can accept an
1114 * older device, but not too old.
1116 __u64 ev1 = le64_to_cpu(sb->events);
1117 if (ev1 < mddev->bitmap->events_cleared)
1119 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1122 if (mddev->level != LEVEL_MULTIPATH) {
1124 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1125 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1127 case 0xffff: /* spare */
1129 case 0xfffe: /* faulty */
1130 set_bit(Faulty, &rdev->flags);
1133 set_bit(In_sync, &rdev->flags);
1134 rdev->raid_disk = role;
1137 if (sb->devflags & WriteMostly1)
1138 set_bit(WriteMostly, &rdev->flags);
1139 } else /* MULTIPATH are always insync */
1140 set_bit(In_sync, &rdev->flags);
1145 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1147 struct mdp_superblock_1 *sb;
1148 struct list_head *tmp;
1151 /* make rdev->sb match mddev and rdev data. */
1153 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1155 sb->feature_map = 0;
1157 memset(sb->pad1, 0, sizeof(sb->pad1));
1158 memset(sb->pad2, 0, sizeof(sb->pad2));
1159 memset(sb->pad3, 0, sizeof(sb->pad3));
1161 sb->utime = cpu_to_le64((__u64)mddev->utime);
1162 sb->events = cpu_to_le64(mddev->events);
1164 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1166 sb->resync_offset = cpu_to_le64(0);
1168 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1170 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1171 sb->size = cpu_to_le64(mddev->size<<1);
1173 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1174 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1175 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1179 ITERATE_RDEV(mddev,rdev2,tmp)
1180 if (rdev2->desc_nr+1 > max_dev)
1181 max_dev = rdev2->desc_nr+1;
1183 sb->max_dev = cpu_to_le32(max_dev);
1184 for (i=0; i<max_dev;i++)
1185 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1187 ITERATE_RDEV(mddev,rdev2,tmp) {
1189 if (test_bit(Faulty, &rdev2->flags))
1190 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1191 else if (test_bit(In_sync, &rdev2->flags))
1192 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1194 sb->dev_roles[i] = cpu_to_le16(0xffff);
1197 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1198 sb->sb_csum = calc_sb_1_csum(sb);
1202 static struct super_type super_types[] = {
1205 .owner = THIS_MODULE,
1206 .load_super = super_90_load,
1207 .validate_super = super_90_validate,
1208 .sync_super = super_90_sync,
1212 .owner = THIS_MODULE,
1213 .load_super = super_1_load,
1214 .validate_super = super_1_validate,
1215 .sync_super = super_1_sync,
1219 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1221 struct list_head *tmp;
1224 ITERATE_RDEV(mddev,rdev,tmp)
1225 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1231 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1233 struct list_head *tmp;
1236 ITERATE_RDEV(mddev1,rdev,tmp)
1237 if (match_dev_unit(mddev2, rdev))
1243 static LIST_HEAD(pending_raid_disks);
1245 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1247 mdk_rdev_t *same_pdev;
1248 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1256 /* make sure rdev->size exceeds mddev->size */
1257 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1259 /* Cannot change size, so fail */
1262 mddev->size = rdev->size;
1264 same_pdev = match_dev_unit(mddev, rdev);
1267 "%s: WARNING: %s appears to be on the same physical"
1268 " disk as %s. True\n protection against single-disk"
1269 " failure might be compromised.\n",
1270 mdname(mddev), bdevname(rdev->bdev,b),
1271 bdevname(same_pdev->bdev,b2));
1273 /* Verify rdev->desc_nr is unique.
1274 * If it is -1, assign a free number, else
1275 * check number is not in use
1277 if (rdev->desc_nr < 0) {
1279 if (mddev->pers) choice = mddev->raid_disks;
1280 while (find_rdev_nr(mddev, choice))
1282 rdev->desc_nr = choice;
1284 if (find_rdev_nr(mddev, rdev->desc_nr))
1287 bdevname(rdev->bdev,b);
1288 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1290 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1293 list_add(&rdev->same_set, &mddev->disks);
1294 rdev->mddev = mddev;
1295 printk(KERN_INFO "md: bind<%s>\n", b);
1297 rdev->kobj.parent = &mddev->kobj;
1298 kobject_add(&rdev->kobj);
1300 if (rdev->bdev->bd_part)
1301 ko = &rdev->bdev->bd_part->kobj;
1303 ko = &rdev->bdev->bd_disk->kobj;
1304 sysfs_create_link(&rdev->kobj, ko, "block");
1305 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1309 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1311 char b[BDEVNAME_SIZE];
1316 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1317 list_del_init(&rdev->same_set);
1318 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1320 sysfs_remove_link(&rdev->kobj, "block");
1321 kobject_del(&rdev->kobj);
1325 * prevent the device from being mounted, repartitioned or
1326 * otherwise reused by a RAID array (or any other kernel
1327 * subsystem), by bd_claiming the device.
1329 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1332 struct block_device *bdev;
1333 char b[BDEVNAME_SIZE];
1335 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1337 printk(KERN_ERR "md: could not open %s.\n",
1338 __bdevname(dev, b));
1339 return PTR_ERR(bdev);
1341 err = bd_claim(bdev, rdev);
1343 printk(KERN_ERR "md: could not bd_claim %s.\n",
1352 static void unlock_rdev(mdk_rdev_t *rdev)
1354 struct block_device *bdev = rdev->bdev;
1362 void md_autodetect_dev(dev_t dev);
1364 static void export_rdev(mdk_rdev_t * rdev)
1366 char b[BDEVNAME_SIZE];
1367 printk(KERN_INFO "md: export_rdev(%s)\n",
1368 bdevname(rdev->bdev,b));
1372 list_del_init(&rdev->same_set);
1374 md_autodetect_dev(rdev->bdev->bd_dev);
1377 kobject_put(&rdev->kobj);
1380 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1382 unbind_rdev_from_array(rdev);
1386 static void export_array(mddev_t *mddev)
1388 struct list_head *tmp;
1391 ITERATE_RDEV(mddev,rdev,tmp) {
1396 kick_rdev_from_array(rdev);
1398 if (!list_empty(&mddev->disks))
1400 mddev->raid_disks = 0;
1401 mddev->major_version = 0;
1404 static void print_desc(mdp_disk_t *desc)
1406 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1407 desc->major,desc->minor,desc->raid_disk,desc->state);
1410 static void print_sb(mdp_super_t *sb)
1415 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1416 sb->major_version, sb->minor_version, sb->patch_version,
1417 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1419 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1420 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1421 sb->md_minor, sb->layout, sb->chunk_size);
1422 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1423 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1424 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1425 sb->failed_disks, sb->spare_disks,
1426 sb->sb_csum, (unsigned long)sb->events_lo);
1429 for (i = 0; i < MD_SB_DISKS; i++) {
1432 desc = sb->disks + i;
1433 if (desc->number || desc->major || desc->minor ||
1434 desc->raid_disk || (desc->state && (desc->state != 4))) {
1435 printk(" D %2d: ", i);
1439 printk(KERN_INFO "md: THIS: ");
1440 print_desc(&sb->this_disk);
1444 static void print_rdev(mdk_rdev_t *rdev)
1446 char b[BDEVNAME_SIZE];
1447 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1448 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1449 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1451 if (rdev->sb_loaded) {
1452 printk(KERN_INFO "md: rdev superblock:\n");
1453 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1455 printk(KERN_INFO "md: no rdev superblock!\n");
1458 void md_print_devices(void)
1460 struct list_head *tmp, *tmp2;
1463 char b[BDEVNAME_SIZE];
1466 printk("md: **********************************\n");
1467 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1468 printk("md: **********************************\n");
1469 ITERATE_MDDEV(mddev,tmp) {
1472 bitmap_print_sb(mddev->bitmap);
1474 printk("%s: ", mdname(mddev));
1475 ITERATE_RDEV(mddev,rdev,tmp2)
1476 printk("<%s>", bdevname(rdev->bdev,b));
1479 ITERATE_RDEV(mddev,rdev,tmp2)
1482 printk("md: **********************************\n");
1487 static void sync_sbs(mddev_t * mddev)
1490 struct list_head *tmp;
1492 ITERATE_RDEV(mddev,rdev,tmp) {
1493 super_types[mddev->major_version].
1494 sync_super(mddev, rdev);
1495 rdev->sb_loaded = 1;
1499 static void md_update_sb(mddev_t * mddev)
1502 struct list_head *tmp;
1507 spin_lock_irq(&mddev->write_lock);
1508 sync_req = mddev->in_sync;
1509 mddev->utime = get_seconds();
1512 if (!mddev->events) {
1514 * oops, this 64-bit counter should never wrap.
1515 * Either we are in around ~1 trillion A.C., assuming
1516 * 1 reboot per second, or we have a bug:
1521 mddev->sb_dirty = 2;
1525 * do not write anything to disk if using
1526 * nonpersistent superblocks
1528 if (!mddev->persistent) {
1529 mddev->sb_dirty = 0;
1530 spin_unlock_irq(&mddev->write_lock);
1531 wake_up(&mddev->sb_wait);
1534 spin_unlock_irq(&mddev->write_lock);
1537 "md: updating %s RAID superblock on device (in sync %d)\n",
1538 mdname(mddev),mddev->in_sync);
1540 err = bitmap_update_sb(mddev->bitmap);
1541 ITERATE_RDEV(mddev,rdev,tmp) {
1542 char b[BDEVNAME_SIZE];
1543 dprintk(KERN_INFO "md: ");
1544 if (test_bit(Faulty, &rdev->flags))
1545 dprintk("(skipping faulty ");
1547 dprintk("%s ", bdevname(rdev->bdev,b));
1548 if (!test_bit(Faulty, &rdev->flags)) {
1549 md_super_write(mddev,rdev,
1550 rdev->sb_offset<<1, rdev->sb_size,
1552 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1553 bdevname(rdev->bdev,b),
1554 (unsigned long long)rdev->sb_offset);
1558 if (mddev->level == LEVEL_MULTIPATH)
1559 /* only need to write one superblock... */
1562 md_super_wait(mddev);
1563 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1565 spin_lock_irq(&mddev->write_lock);
1566 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
1567 /* have to write it out again */
1568 spin_unlock_irq(&mddev->write_lock);
1571 mddev->sb_dirty = 0;
1572 spin_unlock_irq(&mddev->write_lock);
1573 wake_up(&mddev->sb_wait);
1577 /* words written to sysfs files may, or my not, be \n terminated.
1578 * We want to accept with case. For this we use cmd_match.
1580 static int cmd_match(const char *cmd, const char *str)
1582 /* See if cmd, written into a sysfs file, matches
1583 * str. They must either be the same, or cmd can
1584 * have a trailing newline
1586 while (*cmd && *str && *cmd == *str) {
1597 struct rdev_sysfs_entry {
1598 struct attribute attr;
1599 ssize_t (*show)(mdk_rdev_t *, char *);
1600 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1604 state_show(mdk_rdev_t *rdev, char *page)
1609 if (test_bit(Faulty, &rdev->flags)) {
1610 len+= sprintf(page+len, "%sfaulty",sep);
1613 if (test_bit(In_sync, &rdev->flags)) {
1614 len += sprintf(page+len, "%sin_sync",sep);
1617 if (!test_bit(Faulty, &rdev->flags) &&
1618 !test_bit(In_sync, &rdev->flags)) {
1619 len += sprintf(page+len, "%sspare", sep);
1622 return len+sprintf(page+len, "\n");
1625 static struct rdev_sysfs_entry
1626 rdev_state = __ATTR_RO(state);
1629 super_show(mdk_rdev_t *rdev, char *page)
1631 if (rdev->sb_loaded && rdev->sb_size) {
1632 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1633 return rdev->sb_size;
1637 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1640 errors_show(mdk_rdev_t *rdev, char *page)
1642 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1646 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1649 unsigned long n = simple_strtoul(buf, &e, 10);
1650 if (*buf && (*e == 0 || *e == '\n')) {
1651 atomic_set(&rdev->corrected_errors, n);
1656 static struct rdev_sysfs_entry rdev_errors =
1657 __ATTR(errors, 0644, errors_show, errors_store);
1660 slot_show(mdk_rdev_t *rdev, char *page)
1662 if (rdev->raid_disk < 0)
1663 return sprintf(page, "none\n");
1665 return sprintf(page, "%d\n", rdev->raid_disk);
1669 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1672 int slot = simple_strtoul(buf, &e, 10);
1673 if (strncmp(buf, "none", 4)==0)
1675 else if (e==buf || (*e && *e!= '\n'))
1677 if (rdev->mddev->pers)
1678 /* Cannot set slot in active array (yet) */
1680 if (slot >= rdev->mddev->raid_disks)
1682 rdev->raid_disk = slot;
1683 /* assume it is working */
1685 set_bit(In_sync, &rdev->flags);
1690 static struct rdev_sysfs_entry rdev_slot =
1691 __ATTR(slot, 0644, slot_show, slot_store);
1694 offset_show(mdk_rdev_t *rdev, char *page)
1696 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1700 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1703 unsigned long long offset = simple_strtoull(buf, &e, 10);
1704 if (e==buf || (*e && *e != '\n'))
1706 if (rdev->mddev->pers)
1708 rdev->data_offset = offset;
1712 static struct rdev_sysfs_entry rdev_offset =
1713 __ATTR(offset, 0644, offset_show, offset_store);
1716 rdev_size_show(mdk_rdev_t *rdev, char *page)
1718 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1722 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1725 unsigned long long size = simple_strtoull(buf, &e, 10);
1726 if (e==buf || (*e && *e != '\n'))
1728 if (rdev->mddev->pers)
1731 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1732 rdev->mddev->size = size;
1736 static struct rdev_sysfs_entry rdev_size =
1737 __ATTR(size, 0644, rdev_size_show, rdev_size_store);
1739 static struct attribute *rdev_default_attrs[] = {
1749 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1751 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1752 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1756 return entry->show(rdev, page);
1760 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1761 const char *page, size_t length)
1763 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1764 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1768 return entry->store(rdev, page, length);
1771 static void rdev_free(struct kobject *ko)
1773 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1776 static struct sysfs_ops rdev_sysfs_ops = {
1777 .show = rdev_attr_show,
1778 .store = rdev_attr_store,
1780 static struct kobj_type rdev_ktype = {
1781 .release = rdev_free,
1782 .sysfs_ops = &rdev_sysfs_ops,
1783 .default_attrs = rdev_default_attrs,
1787 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1789 * mark the device faulty if:
1791 * - the device is nonexistent (zero size)
1792 * - the device has no valid superblock
1794 * a faulty rdev _never_ has rdev->sb set.
1796 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1798 char b[BDEVNAME_SIZE];
1803 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1805 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1806 return ERR_PTR(-ENOMEM);
1809 if ((err = alloc_disk_sb(rdev)))
1812 err = lock_rdev(rdev, newdev);
1816 rdev->kobj.parent = NULL;
1817 rdev->kobj.ktype = &rdev_ktype;
1818 kobject_init(&rdev->kobj);
1822 rdev->data_offset = 0;
1823 atomic_set(&rdev->nr_pending, 0);
1824 atomic_set(&rdev->read_errors, 0);
1825 atomic_set(&rdev->corrected_errors, 0);
1827 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1830 "md: %s has zero or unknown size, marking faulty!\n",
1831 bdevname(rdev->bdev,b));
1836 if (super_format >= 0) {
1837 err = super_types[super_format].
1838 load_super(rdev, NULL, super_minor);
1839 if (err == -EINVAL) {
1841 "md: %s has invalid sb, not importing!\n",
1842 bdevname(rdev->bdev,b));
1847 "md: could not read %s's sb, not importing!\n",
1848 bdevname(rdev->bdev,b));
1852 INIT_LIST_HEAD(&rdev->same_set);
1857 if (rdev->sb_page) {
1863 return ERR_PTR(err);
1867 * Check a full RAID array for plausibility
1871 static void analyze_sbs(mddev_t * mddev)
1874 struct list_head *tmp;
1875 mdk_rdev_t *rdev, *freshest;
1876 char b[BDEVNAME_SIZE];
1879 ITERATE_RDEV(mddev,rdev,tmp)
1880 switch (super_types[mddev->major_version].
1881 load_super(rdev, freshest, mddev->minor_version)) {
1889 "md: fatal superblock inconsistency in %s"
1890 " -- removing from array\n",
1891 bdevname(rdev->bdev,b));
1892 kick_rdev_from_array(rdev);
1896 super_types[mddev->major_version].
1897 validate_super(mddev, freshest);
1900 ITERATE_RDEV(mddev,rdev,tmp) {
1901 if (rdev != freshest)
1902 if (super_types[mddev->major_version].
1903 validate_super(mddev, rdev)) {
1904 printk(KERN_WARNING "md: kicking non-fresh %s"
1906 bdevname(rdev->bdev,b));
1907 kick_rdev_from_array(rdev);
1910 if (mddev->level == LEVEL_MULTIPATH) {
1911 rdev->desc_nr = i++;
1912 rdev->raid_disk = rdev->desc_nr;
1913 set_bit(In_sync, &rdev->flags);
1919 if (mddev->recovery_cp != MaxSector &&
1921 printk(KERN_ERR "md: %s: raid array is not clean"
1922 " -- starting background reconstruction\n",
1928 level_show(mddev_t *mddev, char *page)
1930 struct mdk_personality *p = mddev->pers;
1932 return sprintf(page, "%s\n", p->name);
1933 else if (mddev->clevel[0])
1934 return sprintf(page, "%s\n", mddev->clevel);
1935 else if (mddev->level != LEVEL_NONE)
1936 return sprintf(page, "%d\n", mddev->level);
1942 level_store(mddev_t *mddev, const char *buf, size_t len)
1949 if (len >= sizeof(mddev->clevel))
1951 strncpy(mddev->clevel, buf, len);
1952 if (mddev->clevel[len-1] == '\n')
1954 mddev->clevel[len] = 0;
1955 mddev->level = LEVEL_NONE;
1959 static struct md_sysfs_entry md_level =
1960 __ATTR(level, 0644, level_show, level_store);
1963 raid_disks_show(mddev_t *mddev, char *page)
1965 if (mddev->raid_disks == 0)
1967 return sprintf(page, "%d\n", mddev->raid_disks);
1970 static int update_raid_disks(mddev_t *mddev, int raid_disks);
1973 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
1975 /* can only set raid_disks if array is not yet active */
1978 unsigned long n = simple_strtoul(buf, &e, 10);
1980 if (!*buf || (*e && *e != '\n'))
1984 rv = update_raid_disks(mddev, n);
1986 mddev->raid_disks = n;
1987 return rv ? rv : len;
1989 static struct md_sysfs_entry md_raid_disks =
1990 __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
1993 chunk_size_show(mddev_t *mddev, char *page)
1995 return sprintf(page, "%d\n", mddev->chunk_size);
1999 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2001 /* can only set chunk_size if array is not yet active */
2003 unsigned long n = simple_strtoul(buf, &e, 10);
2007 if (!*buf || (*e && *e != '\n'))
2010 mddev->chunk_size = n;
2013 static struct md_sysfs_entry md_chunk_size =
2014 __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2017 null_show(mddev_t *mddev, char *page)
2023 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2025 /* buf must be %d:%d\n? giving major and minor numbers */
2026 /* The new device is added to the array.
2027 * If the array has a persistent superblock, we read the
2028 * superblock to initialise info and check validity.
2029 * Otherwise, only checking done is that in bind_rdev_to_array,
2030 * which mainly checks size.
2033 int major = simple_strtoul(buf, &e, 10);
2039 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2041 minor = simple_strtoul(e+1, &e, 10);
2042 if (*e && *e != '\n')
2044 dev = MKDEV(major, minor);
2045 if (major != MAJOR(dev) ||
2046 minor != MINOR(dev))
2050 if (mddev->persistent) {
2051 rdev = md_import_device(dev, mddev->major_version,
2052 mddev->minor_version);
2053 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2054 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2055 mdk_rdev_t, same_set);
2056 err = super_types[mddev->major_version]
2057 .load_super(rdev, rdev0, mddev->minor_version);
2062 rdev = md_import_device(dev, -1, -1);
2065 return PTR_ERR(rdev);
2066 err = bind_rdev_to_array(rdev, mddev);
2070 return err ? err : len;
2073 static struct md_sysfs_entry md_new_device =
2074 __ATTR(new_dev, 0200, null_show, new_dev_store);
2077 size_show(mddev_t *mddev, char *page)
2079 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2082 static int update_size(mddev_t *mddev, unsigned long size);
2085 size_store(mddev_t *mddev, const char *buf, size_t len)
2087 /* If array is inactive, we can reduce the component size, but
2088 * not increase it (except from 0).
2089 * If array is active, we can try an on-line resize
2093 unsigned long long size = simple_strtoull(buf, &e, 10);
2094 if (!*buf || *buf == '\n' ||
2099 err = update_size(mddev, size);
2100 md_update_sb(mddev);
2102 if (mddev->size == 0 ||
2108 return err ? err : len;
2111 static struct md_sysfs_entry md_size =
2112 __ATTR(component_size, 0644, size_show, size_store);
2116 * This is either 'none' for arrays with externally managed metadata,
2117 * or N.M for internally known formats
2120 metadata_show(mddev_t *mddev, char *page)
2122 if (mddev->persistent)
2123 return sprintf(page, "%d.%d\n",
2124 mddev->major_version, mddev->minor_version);
2126 return sprintf(page, "none\n");
2130 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2134 if (!list_empty(&mddev->disks))
2137 if (cmd_match(buf, "none")) {
2138 mddev->persistent = 0;
2139 mddev->major_version = 0;
2140 mddev->minor_version = 90;
2143 major = simple_strtoul(buf, &e, 10);
2144 if (e==buf || *e != '.')
2147 minor = simple_strtoul(buf, &e, 10);
2148 if (e==buf || *e != '\n')
2150 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2151 super_types[major].name == NULL)
2153 mddev->major_version = major;
2154 mddev->minor_version = minor;
2155 mddev->persistent = 1;
2159 static struct md_sysfs_entry md_metadata =
2160 __ATTR(metadata_version, 0644, metadata_show, metadata_store);
2163 action_show(mddev_t *mddev, char *page)
2165 char *type = "idle";
2166 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2167 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2168 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2169 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2171 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2178 return sprintf(page, "%s\n", type);
2182 action_store(mddev_t *mddev, const char *page, size_t len)
2184 if (!mddev->pers || !mddev->pers->sync_request)
2187 if (cmd_match(page, "idle")) {
2188 if (mddev->sync_thread) {
2189 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2190 md_unregister_thread(mddev->sync_thread);
2191 mddev->sync_thread = NULL;
2192 mddev->recovery = 0;
2194 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2195 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2197 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2198 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2200 if (cmd_match(page, "check"))
2201 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2202 else if (cmd_match(page, "repair"))
2204 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2205 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2207 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2208 md_wakeup_thread(mddev->thread);
2213 mismatch_cnt_show(mddev_t *mddev, char *page)
2215 return sprintf(page, "%llu\n",
2216 (unsigned long long) mddev->resync_mismatches);
2219 static struct md_sysfs_entry
2220 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2223 static struct md_sysfs_entry
2224 md_mismatches = __ATTR_RO(mismatch_cnt);
2227 sync_min_show(mddev_t *mddev, char *page)
2229 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2230 mddev->sync_speed_min ? "local": "system");
2234 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2238 if (strncmp(buf, "system", 6)==0) {
2239 mddev->sync_speed_min = 0;
2242 min = simple_strtoul(buf, &e, 10);
2243 if (buf == e || (*e && *e != '\n') || min <= 0)
2245 mddev->sync_speed_min = min;
2249 static struct md_sysfs_entry md_sync_min =
2250 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2253 sync_max_show(mddev_t *mddev, char *page)
2255 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2256 mddev->sync_speed_max ? "local": "system");
2260 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2264 if (strncmp(buf, "system", 6)==0) {
2265 mddev->sync_speed_max = 0;
2268 max = simple_strtoul(buf, &e, 10);
2269 if (buf == e || (*e && *e != '\n') || max <= 0)
2271 mddev->sync_speed_max = max;
2275 static struct md_sysfs_entry md_sync_max =
2276 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2280 sync_speed_show(mddev_t *mddev, char *page)
2282 unsigned long resync, dt, db;
2283 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2284 dt = ((jiffies - mddev->resync_mark) / HZ);
2286 db = resync - (mddev->resync_mark_cnt);
2287 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2290 static struct md_sysfs_entry
2291 md_sync_speed = __ATTR_RO(sync_speed);
2294 sync_completed_show(mddev_t *mddev, char *page)
2296 unsigned long max_blocks, resync;
2298 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2299 max_blocks = mddev->resync_max_sectors;
2301 max_blocks = mddev->size << 1;
2303 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2304 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2307 static struct md_sysfs_entry
2308 md_sync_completed = __ATTR_RO(sync_completed);
2310 static struct attribute *md_default_attrs[] = {
2312 &md_raid_disks.attr,
2313 &md_chunk_size.attr,
2316 &md_new_device.attr,
2320 static struct attribute *md_redundancy_attrs[] = {
2322 &md_mismatches.attr,
2325 &md_sync_speed.attr,
2326 &md_sync_completed.attr,
2329 static struct attribute_group md_redundancy_group = {
2331 .attrs = md_redundancy_attrs,
2336 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2338 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2339 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2345 rv = entry->show(mddev, page);
2346 mddev_unlock(mddev);
2351 md_attr_store(struct kobject *kobj, struct attribute *attr,
2352 const char *page, size_t length)
2354 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2355 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2361 rv = entry->store(mddev, page, length);
2362 mddev_unlock(mddev);
2366 static void md_free(struct kobject *ko)
2368 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2372 static struct sysfs_ops md_sysfs_ops = {
2373 .show = md_attr_show,
2374 .store = md_attr_store,
2376 static struct kobj_type md_ktype = {
2378 .sysfs_ops = &md_sysfs_ops,
2379 .default_attrs = md_default_attrs,
2384 static struct kobject *md_probe(dev_t dev, int *part, void *data)
2386 static DECLARE_MUTEX(disks_sem);
2387 mddev_t *mddev = mddev_find(dev);
2388 struct gendisk *disk;
2389 int partitioned = (MAJOR(dev) != MD_MAJOR);
2390 int shift = partitioned ? MdpMinorShift : 0;
2391 int unit = MINOR(dev) >> shift;
2397 if (mddev->gendisk) {
2402 disk = alloc_disk(1 << shift);
2408 disk->major = MAJOR(dev);
2409 disk->first_minor = unit << shift;
2411 sprintf(disk->disk_name, "md_d%d", unit);
2412 sprintf(disk->devfs_name, "md/d%d", unit);
2414 sprintf(disk->disk_name, "md%d", unit);
2415 sprintf(disk->devfs_name, "md/%d", unit);
2417 disk->fops = &md_fops;
2418 disk->private_data = mddev;
2419 disk->queue = mddev->queue;
2421 mddev->gendisk = disk;
2423 mddev->kobj.parent = &disk->kobj;
2424 mddev->kobj.k_name = NULL;
2425 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2426 mddev->kobj.ktype = &md_ktype;
2427 kobject_register(&mddev->kobj);
2431 void md_wakeup_thread(mdk_thread_t *thread);
2433 static void md_safemode_timeout(unsigned long data)
2435 mddev_t *mddev = (mddev_t *) data;
2437 mddev->safemode = 1;
2438 md_wakeup_thread(mddev->thread);
2441 static int start_dirty_degraded;
2443 static int do_md_run(mddev_t * mddev)
2447 struct list_head *tmp;
2449 struct gendisk *disk;
2450 struct mdk_personality *pers;
2451 char b[BDEVNAME_SIZE];
2453 if (list_empty(&mddev->disks))
2454 /* cannot run an array with no devices.. */
2461 * Analyze all RAID superblock(s)
2463 if (!mddev->raid_disks)
2466 chunk_size = mddev->chunk_size;
2469 if (chunk_size > MAX_CHUNK_SIZE) {
2470 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2471 chunk_size, MAX_CHUNK_SIZE);
2475 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2477 if ( (1 << ffz(~chunk_size)) != chunk_size) {
2478 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
2481 if (chunk_size < PAGE_SIZE) {
2482 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2483 chunk_size, PAGE_SIZE);
2487 /* devices must have minimum size of one chunk */
2488 ITERATE_RDEV(mddev,rdev,tmp) {
2489 if (test_bit(Faulty, &rdev->flags))
2491 if (rdev->size < chunk_size / 1024) {
2493 "md: Dev %s smaller than chunk_size:"
2495 bdevname(rdev->bdev,b),
2496 (unsigned long long)rdev->size,
2504 if (mddev->level != LEVEL_NONE)
2505 request_module("md-level-%d", mddev->level);
2506 else if (mddev->clevel[0])
2507 request_module("md-%s", mddev->clevel);
2511 * Drop all container device buffers, from now on
2512 * the only valid external interface is through the md
2514 * Also find largest hardsector size
2516 ITERATE_RDEV(mddev,rdev,tmp) {
2517 if (test_bit(Faulty, &rdev->flags))
2519 sync_blockdev(rdev->bdev);
2520 invalidate_bdev(rdev->bdev, 0);
2523 md_probe(mddev->unit, NULL, NULL);
2524 disk = mddev->gendisk;
2528 spin_lock(&pers_lock);
2529 pers = find_pers(mddev->level, mddev->clevel);
2530 if (!pers || !try_module_get(pers->owner)) {
2531 spin_unlock(&pers_lock);
2532 if (mddev->level != LEVEL_NONE)
2533 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2536 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2541 spin_unlock(&pers_lock);
2542 mddev->level = pers->level;
2543 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2545 mddev->recovery = 0;
2546 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
2547 mddev->barriers_work = 1;
2548 mddev->ok_start_degraded = start_dirty_degraded;
2551 mddev->ro = 2; /* read-only, but switch on first write */
2553 err = mddev->pers->run(mddev);
2554 if (!err && mddev->pers->sync_request) {
2555 err = bitmap_create(mddev);
2557 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2558 mdname(mddev), err);
2559 mddev->pers->stop(mddev);
2563 printk(KERN_ERR "md: pers->run() failed ...\n");
2564 module_put(mddev->pers->owner);
2566 bitmap_destroy(mddev);
2569 if (mddev->pers->sync_request)
2570 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
2571 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2574 atomic_set(&mddev->writes_pending,0);
2575 mddev->safemode = 0;
2576 mddev->safemode_timer.function = md_safemode_timeout;
2577 mddev->safemode_timer.data = (unsigned long) mddev;
2578 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2581 ITERATE_RDEV(mddev,rdev,tmp)
2582 if (rdev->raid_disk >= 0) {
2584 sprintf(nm, "rd%d", rdev->raid_disk);
2585 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2588 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2589 md_wakeup_thread(mddev->thread);
2591 if (mddev->sb_dirty)
2592 md_update_sb(mddev);
2594 set_capacity(disk, mddev->array_size<<1);
2596 /* If we call blk_queue_make_request here, it will
2597 * re-initialise max_sectors etc which may have been
2598 * refined inside -> run. So just set the bits we need to set.
2599 * Most initialisation happended when we called
2600 * blk_queue_make_request(..., md_fail_request)
2603 mddev->queue->queuedata = mddev;
2604 mddev->queue->make_request_fn = mddev->pers->make_request;
2607 md_new_event(mddev);
2611 static int restart_array(mddev_t *mddev)
2613 struct gendisk *disk = mddev->gendisk;
2617 * Complain if it has no devices
2620 if (list_empty(&mddev->disks))
2628 mddev->safemode = 0;
2630 set_disk_ro(disk, 0);
2632 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2635 * Kick recovery or resync if necessary
2637 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2638 md_wakeup_thread(mddev->thread);
2641 printk(KERN_ERR "md: %s has no personality assigned.\n",
2650 static int do_md_stop(mddev_t * mddev, int ro)
2653 struct gendisk *disk = mddev->gendisk;
2656 if (atomic_read(&mddev->active)>2) {
2657 printk("md: %s still in use.\n",mdname(mddev));
2661 if (mddev->sync_thread) {
2662 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2663 md_unregister_thread(mddev->sync_thread);
2664 mddev->sync_thread = NULL;
2667 del_timer_sync(&mddev->safemode_timer);
2669 invalidate_partition(disk, 0);
2677 bitmap_flush(mddev);
2678 md_super_wait(mddev);
2680 set_disk_ro(disk, 0);
2681 blk_queue_make_request(mddev->queue, md_fail_request);
2682 mddev->pers->stop(mddev);
2683 if (mddev->pers->sync_request)
2684 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2686 module_put(mddev->pers->owner);
2691 if (!mddev->in_sync) {
2692 /* mark array as shutdown cleanly */
2694 md_update_sb(mddev);
2697 set_disk_ro(disk, 1);
2701 * Free resources if final stop
2705 struct list_head *tmp;
2706 struct gendisk *disk;
2707 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2709 bitmap_destroy(mddev);
2710 if (mddev->bitmap_file) {
2711 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2712 fput(mddev->bitmap_file);
2713 mddev->bitmap_file = NULL;
2715 mddev->bitmap_offset = 0;
2717 ITERATE_RDEV(mddev,rdev,tmp)
2718 if (rdev->raid_disk >= 0) {
2720 sprintf(nm, "rd%d", rdev->raid_disk);
2721 sysfs_remove_link(&mddev->kobj, nm);
2724 export_array(mddev);
2726 mddev->array_size = 0;
2727 disk = mddev->gendisk;
2729 set_capacity(disk, 0);
2732 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2735 md_new_event(mddev);
2740 static void autorun_array(mddev_t *mddev)
2743 struct list_head *tmp;
2746 if (list_empty(&mddev->disks))
2749 printk(KERN_INFO "md: running: ");
2751 ITERATE_RDEV(mddev,rdev,tmp) {
2752 char b[BDEVNAME_SIZE];
2753 printk("<%s>", bdevname(rdev->bdev,b));
2757 err = do_md_run (mddev);
2759 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2760 do_md_stop (mddev, 0);
2765 * lets try to run arrays based on all disks that have arrived
2766 * until now. (those are in pending_raid_disks)
2768 * the method: pick the first pending disk, collect all disks with
2769 * the same UUID, remove all from the pending list and put them into
2770 * the 'same_array' list. Then order this list based on superblock
2771 * update time (freshest comes first), kick out 'old' disks and
2772 * compare superblocks. If everything's fine then run it.
2774 * If "unit" is allocated, then bump its reference count
2776 static void autorun_devices(int part)
2778 struct list_head *tmp;
2779 mdk_rdev_t *rdev0, *rdev;
2781 char b[BDEVNAME_SIZE];
2783 printk(KERN_INFO "md: autorun ...\n");
2784 while (!list_empty(&pending_raid_disks)) {
2786 LIST_HEAD(candidates);
2787 rdev0 = list_entry(pending_raid_disks.next,
2788 mdk_rdev_t, same_set);
2790 printk(KERN_INFO "md: considering %s ...\n",
2791 bdevname(rdev0->bdev,b));
2792 INIT_LIST_HEAD(&candidates);
2793 ITERATE_RDEV_PENDING(rdev,tmp)
2794 if (super_90_load(rdev, rdev0, 0) >= 0) {
2795 printk(KERN_INFO "md: adding %s ...\n",
2796 bdevname(rdev->bdev,b));
2797 list_move(&rdev->same_set, &candidates);
2800 * now we have a set of devices, with all of them having
2801 * mostly sane superblocks. It's time to allocate the
2804 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2805 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2806 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2810 dev = MKDEV(mdp_major,
2811 rdev0->preferred_minor << MdpMinorShift);
2813 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2815 md_probe(dev, NULL, NULL);
2816 mddev = mddev_find(dev);
2819 "md: cannot allocate memory for md drive.\n");
2822 if (mddev_lock(mddev))
2823 printk(KERN_WARNING "md: %s locked, cannot run\n",
2825 else if (mddev->raid_disks || mddev->major_version
2826 || !list_empty(&mddev->disks)) {
2828 "md: %s already running, cannot run %s\n",
2829 mdname(mddev), bdevname(rdev0->bdev,b));
2830 mddev_unlock(mddev);
2832 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2833 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2834 list_del_init(&rdev->same_set);
2835 if (bind_rdev_to_array(rdev, mddev))
2838 autorun_array(mddev);
2839 mddev_unlock(mddev);
2841 /* on success, candidates will be empty, on error
2844 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2848 printk(KERN_INFO "md: ... autorun DONE.\n");
2852 * import RAID devices based on one partition
2853 * if possible, the array gets run as well.
2856 static int autostart_array(dev_t startdev)
2858 char b[BDEVNAME_SIZE];
2859 int err = -EINVAL, i;
2860 mdp_super_t *sb = NULL;
2861 mdk_rdev_t *start_rdev = NULL, *rdev;
2863 start_rdev = md_import_device(startdev, 0, 0);
2864 if (IS_ERR(start_rdev))
2868 /* NOTE: this can only work for 0.90.0 superblocks */
2869 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2870 if (sb->major_version != 0 ||
2871 sb->minor_version != 90 ) {
2872 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2873 export_rdev(start_rdev);
2877 if (test_bit(Faulty, &start_rdev->flags)) {
2879 "md: can not autostart based on faulty %s!\n",
2880 bdevname(start_rdev->bdev,b));
2881 export_rdev(start_rdev);
2884 list_add(&start_rdev->same_set, &pending_raid_disks);
2886 for (i = 0; i < MD_SB_DISKS; i++) {
2887 mdp_disk_t *desc = sb->disks + i;
2888 dev_t dev = MKDEV(desc->major, desc->minor);
2892 if (dev == startdev)
2894 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2896 rdev = md_import_device(dev, 0, 0);
2900 list_add(&rdev->same_set, &pending_raid_disks);
2904 * possibly return codes
2912 static int get_version(void __user * arg)
2916 ver.major = MD_MAJOR_VERSION;
2917 ver.minor = MD_MINOR_VERSION;
2918 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2920 if (copy_to_user(arg, &ver, sizeof(ver)))
2926 static int get_array_info(mddev_t * mddev, void __user * arg)
2928 mdu_array_info_t info;
2929 int nr,working,active,failed,spare;
2931 struct list_head *tmp;
2933 nr=working=active=failed=spare=0;
2934 ITERATE_RDEV(mddev,rdev,tmp) {
2936 if (test_bit(Faulty, &rdev->flags))
2940 if (test_bit(In_sync, &rdev->flags))
2947 info.major_version = mddev->major_version;
2948 info.minor_version = mddev->minor_version;
2949 info.patch_version = MD_PATCHLEVEL_VERSION;
2950 info.ctime = mddev->ctime;
2951 info.level = mddev->level;
2952 info.size = mddev->size;
2953 if (info.size != mddev->size) /* overflow */
2956 info.raid_disks = mddev->raid_disks;
2957 info.md_minor = mddev->md_minor;
2958 info.not_persistent= !mddev->persistent;
2960 info.utime = mddev->utime;
2963 info.state = (1<<MD_SB_CLEAN);
2964 if (mddev->bitmap && mddev->bitmap_offset)
2965 info.state = (1<<MD_SB_BITMAP_PRESENT);
2966 info.active_disks = active;
2967 info.working_disks = working;
2968 info.failed_disks = failed;
2969 info.spare_disks = spare;
2971 info.layout = mddev->layout;
2972 info.chunk_size = mddev->chunk_size;
2974 if (copy_to_user(arg, &info, sizeof(info)))
2980 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
2982 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2983 char *ptr, *buf = NULL;
2986 file = kmalloc(sizeof(*file), GFP_KERNEL);
2990 /* bitmap disabled, zero the first byte and copy out */
2991 if (!mddev->bitmap || !mddev->bitmap->file) {
2992 file->pathname[0] = '\0';
2996 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3000 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3004 strcpy(file->pathname, ptr);
3008 if (copy_to_user(arg, file, sizeof(*file)))
3016 static int get_disk_info(mddev_t * mddev, void __user * arg)
3018 mdu_disk_info_t info;
3022 if (copy_from_user(&info, arg, sizeof(info)))
3027 rdev = find_rdev_nr(mddev, nr);
3029 info.major = MAJOR(rdev->bdev->bd_dev);
3030 info.minor = MINOR(rdev->bdev->bd_dev);
3031 info.raid_disk = rdev->raid_disk;
3033 if (test_bit(Faulty, &rdev->flags))
3034 info.state |= (1<<MD_DISK_FAULTY);
3035 else if (test_bit(In_sync, &rdev->flags)) {
3036 info.state |= (1<<MD_DISK_ACTIVE);
3037 info.state |= (1<<MD_DISK_SYNC);
3039 if (test_bit(WriteMostly, &rdev->flags))
3040 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3042 info.major = info.minor = 0;
3043 info.raid_disk = -1;
3044 info.state = (1<<MD_DISK_REMOVED);
3047 if (copy_to_user(arg, &info, sizeof(info)))
3053 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3055 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3057 dev_t dev = MKDEV(info->major,info->minor);
3059 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3062 if (!mddev->raid_disks) {
3064 /* expecting a device which has a superblock */
3065 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3068 "md: md_import_device returned %ld\n",
3070 return PTR_ERR(rdev);
3072 if (!list_empty(&mddev->disks)) {
3073 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3074 mdk_rdev_t, same_set);
3075 int err = super_types[mddev->major_version]
3076 .load_super(rdev, rdev0, mddev->minor_version);
3079 "md: %s has different UUID to %s\n",
3080 bdevname(rdev->bdev,b),
3081 bdevname(rdev0->bdev,b2));
3086 err = bind_rdev_to_array(rdev, mddev);
3093 * add_new_disk can be used once the array is assembled
3094 * to add "hot spares". They must already have a superblock
3099 if (!mddev->pers->hot_add_disk) {
3101 "%s: personality does not support diskops!\n",
3105 if (mddev->persistent)
3106 rdev = md_import_device(dev, mddev->major_version,
3107 mddev->minor_version);
3109 rdev = md_import_device(dev, -1, -1);
3112 "md: md_import_device returned %ld\n",
3114 return PTR_ERR(rdev);
3116 /* set save_raid_disk if appropriate */
3117 if (!mddev->persistent) {
3118 if (info->state & (1<<MD_DISK_SYNC) &&
3119 info->raid_disk < mddev->raid_disks)
3120 rdev->raid_disk = info->raid_disk;
3122 rdev->raid_disk = -1;
3124 super_types[mddev->major_version].
3125 validate_super(mddev, rdev);
3126 rdev->saved_raid_disk = rdev->raid_disk;
3128 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3129 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3130 set_bit(WriteMostly, &rdev->flags);
3132 rdev->raid_disk = -1;
3133 err = bind_rdev_to_array(rdev, mddev);
3137 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3138 md_wakeup_thread(mddev->thread);
3142 /* otherwise, add_new_disk is only allowed
3143 * for major_version==0 superblocks
3145 if (mddev->major_version != 0) {
3146 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3151 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3153 rdev = md_import_device (dev, -1, 0);
3156 "md: error, md_import_device() returned %ld\n",
3158 return PTR_ERR(rdev);
3160 rdev->desc_nr = info->number;
3161 if (info->raid_disk < mddev->raid_disks)
3162 rdev->raid_disk = info->raid_disk;
3164 rdev->raid_disk = -1;
3168 if (rdev->raid_disk < mddev->raid_disks)
3169 if (info->state & (1<<MD_DISK_SYNC))
3170 set_bit(In_sync, &rdev->flags);
3172 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3173 set_bit(WriteMostly, &rdev->flags);
3175 if (!mddev->persistent) {
3176 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3177 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3179 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3180 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3182 err = bind_rdev_to_array(rdev, mddev);
3192 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3194 char b[BDEVNAME_SIZE];
3200 rdev = find_rdev(mddev, dev);
3204 if (rdev->raid_disk >= 0)
3207 kick_rdev_from_array(rdev);
3208 md_update_sb(mddev);
3209 md_new_event(mddev);
3213 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3214 bdevname(rdev->bdev,b), mdname(mddev));
3218 static int hot_add_disk(mddev_t * mddev, dev_t dev)
3220 char b[BDEVNAME_SIZE];
3228 if (mddev->major_version != 0) {
3229 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3230 " version-0 superblocks.\n",
3234 if (!mddev->pers->hot_add_disk) {
3236 "%s: personality does not support diskops!\n",
3241 rdev = md_import_device (dev, -1, 0);
3244 "md: error, md_import_device() returned %ld\n",
3249 if (mddev->persistent)
3250 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3253 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3255 size = calc_dev_size(rdev, mddev->chunk_size);
3258 if (test_bit(Faulty, &rdev->flags)) {
3260 "md: can not hot-add faulty %s disk to %s!\n",
3261 bdevname(rdev->bdev,b), mdname(mddev));
3265 clear_bit(In_sync, &rdev->flags);
3267 err = bind_rdev_to_array(rdev, mddev);
3272 * The rest should better be atomic, we can have disk failures
3273 * noticed in interrupt contexts ...
3276 if (rdev->desc_nr == mddev->max_disks) {
3277 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3280 goto abort_unbind_export;
3283 rdev->raid_disk = -1;
3285 md_update_sb(mddev);
3288 * Kick recovery, maybe this spare has to be added to the
3289 * array immediately.
3291 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3292 md_wakeup_thread(mddev->thread);
3293 md_new_event(mddev);
3296 abort_unbind_export:
3297 unbind_rdev_from_array(rdev);
3304 /* similar to deny_write_access, but accounts for our holding a reference
3305 * to the file ourselves */
3306 static int deny_bitmap_write_access(struct file * file)
3308 struct inode *inode = file->f_mapping->host;
3310 spin_lock(&inode->i_lock);
3311 if (atomic_read(&inode->i_writecount) > 1) {
3312 spin_unlock(&inode->i_lock);
3315 atomic_set(&inode->i_writecount, -1);
3316 spin_unlock(&inode->i_lock);
3321 static int set_bitmap_file(mddev_t *mddev, int fd)
3326 if (!mddev->pers->quiesce)
3328 if (mddev->recovery || mddev->sync_thread)
3330 /* we should be able to change the bitmap.. */
3336 return -EEXIST; /* cannot add when bitmap is present */
3337 mddev->bitmap_file = fget(fd);
3339 if (mddev->bitmap_file == NULL) {
3340 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3345 err = deny_bitmap_write_access(mddev->bitmap_file);
3347 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3349 fput(mddev->bitmap_file);
3350 mddev->bitmap_file = NULL;
3353 mddev->bitmap_offset = 0; /* file overrides offset */
3354 } else if (mddev->bitmap == NULL)
3355 return -ENOENT; /* cannot remove what isn't there */
3358 mddev->pers->quiesce(mddev, 1);
3360 err = bitmap_create(mddev);
3362 bitmap_destroy(mddev);
3363 mddev->pers->quiesce(mddev, 0);
3364 } else if (fd < 0) {
3365 if (mddev->bitmap_file)
3366 fput(mddev->bitmap_file);
3367 mddev->bitmap_file = NULL;
3374 * set_array_info is used two different ways
3375 * The original usage is when creating a new array.
3376 * In this usage, raid_disks is > 0 and it together with
3377 * level, size, not_persistent,layout,chunksize determine the
3378 * shape of the array.
3379 * This will always create an array with a type-0.90.0 superblock.
3380 * The newer usage is when assembling an array.
3381 * In this case raid_disks will be 0, and the major_version field is
3382 * use to determine which style super-blocks are to be found on the devices.
3383 * The minor and patch _version numbers are also kept incase the
3384 * super_block handler wishes to interpret them.
3386 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3389 if (info->raid_disks == 0) {
3390 /* just setting version number for superblock loading */
3391 if (info->major_version < 0 ||
3392 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3393 super_types[info->major_version].name == NULL) {
3394 /* maybe try to auto-load a module? */
3396 "md: superblock version %d not known\n",
3397 info->major_version);
3400 mddev->major_version = info->major_version;
3401 mddev->minor_version = info->minor_version;
3402 mddev->patch_version = info->patch_version;
3405 mddev->major_version = MD_MAJOR_VERSION;
3406 mddev->minor_version = MD_MINOR_VERSION;
3407 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3408 mddev->ctime = get_seconds();
3410 mddev->level = info->level;
3411 mddev->clevel[0] = 0;
3412 mddev->size = info->size;
3413 mddev->raid_disks = info->raid_disks;
3414 /* don't set md_minor, it is determined by which /dev/md* was
3417 if (info->state & (1<<MD_SB_CLEAN))
3418 mddev->recovery_cp = MaxSector;
3420 mddev->recovery_cp = 0;
3421 mddev->persistent = ! info->not_persistent;
3423 mddev->layout = info->layout;
3424 mddev->chunk_size = info->chunk_size;
3426 mddev->max_disks = MD_SB_DISKS;
3428 mddev->sb_dirty = 1;
3430 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3431 mddev->bitmap_offset = 0;
3434 * Generate a 128 bit UUID
3436 get_random_bytes(mddev->uuid, 16);
3441 static int update_size(mddev_t *mddev, unsigned long size)
3445 struct list_head *tmp;
3447 if (mddev->pers->resize == NULL)
3449 /* The "size" is the amount of each device that is used.
3450 * This can only make sense for arrays with redundancy.
3451 * linear and raid0 always use whatever space is available
3452 * We can only consider changing the size if no resync
3453 * or reconstruction is happening, and if the new size
3454 * is acceptable. It must fit before the sb_offset or,
3455 * if that is <data_offset, it must fit before the
3456 * size of each device.
3457 * If size is zero, we find the largest size that fits.
3459 if (mddev->sync_thread)
3461 ITERATE_RDEV(mddev,rdev,tmp) {
3463 int fit = (size == 0);
3464 if (rdev->sb_offset > rdev->data_offset)
3465 avail = (rdev->sb_offset*2) - rdev->data_offset;
3467 avail = get_capacity(rdev->bdev->bd_disk)
3468 - rdev->data_offset;
3469 if (fit && (size == 0 || size > avail/2))
3471 if (avail < ((sector_t)size << 1))
3474 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3476 struct block_device *bdev;
3478 bdev = bdget_disk(mddev->gendisk, 0);
3480 mutex_lock(&bdev->bd_inode->i_mutex);
3481 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
3482 mutex_unlock(&bdev->bd_inode->i_mutex);
3489 static int update_raid_disks(mddev_t *mddev, int raid_disks)
3492 /* change the number of raid disks */
3493 if (mddev->pers->reshape == NULL)
3495 if (raid_disks <= 0 ||
3496 raid_disks >= mddev->max_disks)
3498 if (mddev->sync_thread)
3500 rv = mddev->pers->reshape(mddev, raid_disks);
3506 * update_array_info is used to change the configuration of an
3508 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3509 * fields in the info are checked against the array.
3510 * Any differences that cannot be handled will cause an error.
3511 * Normally, only one change can be managed at a time.
3513 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3519 /* calculate expected state,ignoring low bits */
3520 if (mddev->bitmap && mddev->bitmap_offset)
3521 state |= (1 << MD_SB_BITMAP_PRESENT);
3523 if (mddev->major_version != info->major_version ||
3524 mddev->minor_version != info->minor_version ||
3525 /* mddev->patch_version != info->patch_version || */
3526 mddev->ctime != info->ctime ||
3527 mddev->level != info->level ||
3528 /* mddev->layout != info->layout || */
3529 !mddev->persistent != info->not_persistent||
3530 mddev->chunk_size != info->chunk_size ||
3531 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3532 ((state^info->state) & 0xfffffe00)
3535 /* Check there is only one change */
3536 if (info->size >= 0 && mddev->size != info->size) cnt++;
3537 if (mddev->raid_disks != info->raid_disks) cnt++;
3538 if (mddev->layout != info->layout) cnt++;
3539 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
3540 if (cnt == 0) return 0;
3541 if (cnt > 1) return -EINVAL;
3543 if (mddev->layout != info->layout) {
3545 * we don't need to do anything at the md level, the
3546 * personality will take care of it all.
3548 if (mddev->pers->reconfig == NULL)
3551 return mddev->pers->reconfig(mddev, info->layout, -1);
3553 if (info->size >= 0 && mddev->size != info->size)
3554 rv = update_size(mddev, info->size);
3556 if (mddev->raid_disks != info->raid_disks)
3557 rv = update_raid_disks(mddev, info->raid_disks);
3559 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3560 if (mddev->pers->quiesce == NULL)
3562 if (mddev->recovery || mddev->sync_thread)
3564 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3565 /* add the bitmap */
3568 if (mddev->default_bitmap_offset == 0)
3570 mddev->bitmap_offset = mddev->default_bitmap_offset;
3571 mddev->pers->quiesce(mddev, 1);
3572 rv = bitmap_create(mddev);
3574 bitmap_destroy(mddev);
3575 mddev->pers->quiesce(mddev, 0);
3577 /* remove the bitmap */
3580 if (mddev->bitmap->file)
3582 mddev->pers->quiesce(mddev, 1);
3583 bitmap_destroy(mddev);
3584 mddev->pers->quiesce(mddev, 0);
3585 mddev->bitmap_offset = 0;
3588 md_update_sb(mddev);
3592 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3596 if (mddev->pers == NULL)
3599 rdev = find_rdev(mddev, dev);
3603 md_error(mddev, rdev);
3607 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3609 mddev_t *mddev = bdev->bd_disk->private_data;
3613 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3617 static int md_ioctl(struct inode *inode, struct file *file,
3618 unsigned int cmd, unsigned long arg)
3621 void __user *argp = (void __user *)arg;
3622 mddev_t *mddev = NULL;
3624 if (!capable(CAP_SYS_ADMIN))
3628 * Commands dealing with the RAID driver but not any
3634 err = get_version(argp);
3637 case PRINT_RAID_DEBUG:
3645 autostart_arrays(arg);
3652 * Commands creating/starting a new array:
3655 mddev = inode->i_bdev->bd_disk->private_data;
3663 if (cmd == START_ARRAY) {
3664 /* START_ARRAY doesn't need to lock the array as autostart_array
3665 * does the locking, and it could even be a different array
3670 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3671 "This will not be supported beyond July 2006\n",
3672 current->comm, current->pid);
3675 err = autostart_array(new_decode_dev(arg));
3677 printk(KERN_WARNING "md: autostart failed!\n");
3683 err = mddev_lock(mddev);
3686 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3693 case SET_ARRAY_INFO:
3695 mdu_array_info_t info;
3697 memset(&info, 0, sizeof(info));
3698 else if (copy_from_user(&info, argp, sizeof(info))) {
3703 err = update_array_info(mddev, &info);
3705 printk(KERN_WARNING "md: couldn't update"
3706 " array info. %d\n", err);
3711 if (!list_empty(&mddev->disks)) {
3713 "md: array %s already has disks!\n",
3718 if (mddev->raid_disks) {
3720 "md: array %s already initialised!\n",
3725 err = set_array_info(mddev, &info);
3727 printk(KERN_WARNING "md: couldn't set"
3728 " array info. %d\n", err);
3738 * Commands querying/configuring an existing array:
3740 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3741 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3742 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3743 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
3749 * Commands even a read-only array can execute:
3753 case GET_ARRAY_INFO:
3754 err = get_array_info(mddev, argp);
3757 case GET_BITMAP_FILE:
3758 err = get_bitmap_file(mddev, argp);
3762 err = get_disk_info(mddev, argp);
3765 case RESTART_ARRAY_RW:
3766 err = restart_array(mddev);
3770 err = do_md_stop (mddev, 0);
3774 err = do_md_stop (mddev, 1);
3778 * We have a problem here : there is no easy way to give a CHS
3779 * virtual geometry. We currently pretend that we have a 2 heads
3780 * 4 sectors (with a BIG number of cylinders...). This drives
3781 * dosfs just mad... ;-)
3786 * The remaining ioctls are changing the state of the
3787 * superblock, so we do not allow them on read-only arrays.
3788 * However non-MD ioctls (e.g. get-size) will still come through
3789 * here and hit the 'default' below, so only disallow
3790 * 'md' ioctls, and switch to rw mode if started auto-readonly.
3792 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3793 mddev->ro && mddev->pers) {
3794 if (mddev->ro == 2) {
3796 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3797 md_wakeup_thread(mddev->thread);
3809 mdu_disk_info_t info;
3810 if (copy_from_user(&info, argp, sizeof(info)))
3813 err = add_new_disk(mddev, &info);
3817 case HOT_REMOVE_DISK:
3818 err = hot_remove_disk(mddev, new_decode_dev(arg));
3822 err = hot_add_disk(mddev, new_decode_dev(arg));
3825 case SET_DISK_FAULTY:
3826 err = set_disk_faulty(mddev, new_decode_dev(arg));
3830 err = do_md_run (mddev);
3833 case SET_BITMAP_FILE:
3834 err = set_bitmap_file(mddev, (int)arg);
3838 if (_IOC_TYPE(cmd) == MD_MAJOR)
3839 printk(KERN_WARNING "md: %s(pid %d) used"
3840 " obsolete MD ioctl, upgrade your"
3841 " software to use new ictls.\n",
3842 current->comm, current->pid);
3849 mddev_unlock(mddev);
3859 static int md_open(struct inode *inode, struct file *file)
3862 * Succeed if we can lock the mddev, which confirms that
3863 * it isn't being stopped right now.
3865 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3868 if ((err = mddev_lock(mddev)))
3873 mddev_unlock(mddev);
3875 check_disk_change(inode->i_bdev);
3880 static int md_release(struct inode *inode, struct file * file)
3882 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3891 static int md_media_changed(struct gendisk *disk)
3893 mddev_t *mddev = disk->private_data;
3895 return mddev->changed;
3898 static int md_revalidate(struct gendisk *disk)
3900 mddev_t *mddev = disk->private_data;
3905 static struct block_device_operations md_fops =
3907 .owner = THIS_MODULE,
3909 .release = md_release,
3911 .getgeo = md_getgeo,
3912 .media_changed = md_media_changed,
3913 .revalidate_disk= md_revalidate,
3916 static int md_thread(void * arg)
3918 mdk_thread_t *thread = arg;
3921 * md_thread is a 'system-thread', it's priority should be very
3922 * high. We avoid resource deadlocks individually in each
3923 * raid personality. (RAID5 does preallocation) We also use RR and
3924 * the very same RT priority as kswapd, thus we will never get
3925 * into a priority inversion deadlock.
3927 * we definitely have to have equal or higher priority than
3928 * bdflush, otherwise bdflush will deadlock if there are too
3929 * many dirty RAID5 blocks.
3932 allow_signal(SIGKILL);
3933 while (!kthread_should_stop()) {
3935 /* We need to wait INTERRUPTIBLE so that
3936 * we don't add to the load-average.
3937 * That means we need to be sure no signals are
3940 if (signal_pending(current))
3941 flush_signals(current);
3943 wait_event_interruptible_timeout
3945 test_bit(THREAD_WAKEUP, &thread->flags)
3946 || kthread_should_stop(),
3950 clear_bit(THREAD_WAKEUP, &thread->flags);
3952 thread->run(thread->mddev);
3958 void md_wakeup_thread(mdk_thread_t *thread)
3961 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3962 set_bit(THREAD_WAKEUP, &thread->flags);
3963 wake_up(&thread->wqueue);
3967 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3970 mdk_thread_t *thread;
3972 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
3976 init_waitqueue_head(&thread->wqueue);
3979 thread->mddev = mddev;
3980 thread->timeout = MAX_SCHEDULE_TIMEOUT;
3981 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
3982 if (IS_ERR(thread->tsk)) {
3989 void md_unregister_thread(mdk_thread_t *thread)
3991 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
3993 kthread_stop(thread->tsk);
3997 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4004 if (!rdev || test_bit(Faulty, &rdev->flags))
4007 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4009 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4010 __builtin_return_address(0),__builtin_return_address(1),
4011 __builtin_return_address(2),__builtin_return_address(3));
4013 if (!mddev->pers->error_handler)
4015 mddev->pers->error_handler(mddev,rdev);
4016 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4017 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4018 md_wakeup_thread(mddev->thread);
4019 md_new_event(mddev);
4022 /* seq_file implementation /proc/mdstat */
4024 static void status_unused(struct seq_file *seq)
4028 struct list_head *tmp;
4030 seq_printf(seq, "unused devices: ");
4032 ITERATE_RDEV_PENDING(rdev,tmp) {
4033 char b[BDEVNAME_SIZE];
4035 seq_printf(seq, "%s ",
4036 bdevname(rdev->bdev,b));
4039 seq_printf(seq, "<none>");
4041 seq_printf(seq, "\n");
4045 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4047 sector_t max_blocks, resync, res;
4048 unsigned long dt, db, rt;
4050 unsigned int per_milli;
4052 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4054 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4055 max_blocks = mddev->resync_max_sectors >> 1;
4057 max_blocks = mddev->size;
4060 * Should not happen.
4066 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4067 * in a sector_t, and (max_blocks>>scale) will fit in a
4068 * u32, as those are the requirements for sector_div.
4069 * Thus 'scale' must be at least 10
4072 if (sizeof(sector_t) > sizeof(unsigned long)) {
4073 while ( max_blocks/2 > (1ULL<<(scale+32)))
4076 res = (resync>>scale)*1000;
4077 sector_div(res, (u32)((max_blocks>>scale)+1));
4081 int i, x = per_milli/50, y = 20-x;
4082 seq_printf(seq, "[");
4083 for (i = 0; i < x; i++)
4084 seq_printf(seq, "=");
4085 seq_printf(seq, ">");
4086 for (i = 0; i < y; i++)
4087 seq_printf(seq, ".");
4088 seq_printf(seq, "] ");
4090 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
4091 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4092 "resync" : "recovery"),
4093 per_milli/10, per_milli % 10,
4094 (unsigned long long) resync,
4095 (unsigned long long) max_blocks);
4098 * We do not want to overflow, so the order of operands and
4099 * the * 100 / 100 trick are important. We do a +1 to be
4100 * safe against division by zero. We only estimate anyway.
4102 * dt: time from mark until now
4103 * db: blocks written from mark until now
4104 * rt: remaining time
4106 dt = ((jiffies - mddev->resync_mark) / HZ);
4108 db = resync - (mddev->resync_mark_cnt/2);
4109 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100;
4111 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4113 seq_printf(seq, " speed=%ldK/sec", db/dt);
4116 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4118 struct list_head *tmp;
4128 spin_lock(&all_mddevs_lock);
4129 list_for_each(tmp,&all_mddevs)
4131 mddev = list_entry(tmp, mddev_t, all_mddevs);
4133 spin_unlock(&all_mddevs_lock);
4136 spin_unlock(&all_mddevs_lock);
4138 return (void*)2;/* tail */
4142 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4144 struct list_head *tmp;
4145 mddev_t *next_mddev, *mddev = v;
4151 spin_lock(&all_mddevs_lock);
4153 tmp = all_mddevs.next;
4155 tmp = mddev->all_mddevs.next;
4156 if (tmp != &all_mddevs)
4157 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4159 next_mddev = (void*)2;
4162 spin_unlock(&all_mddevs_lock);
4170 static void md_seq_stop(struct seq_file *seq, void *v)
4174 if (mddev && v != (void*)1 && v != (void*)2)
4178 struct mdstat_info {
4182 static int md_seq_show(struct seq_file *seq, void *v)
4186 struct list_head *tmp2;
4188 struct mdstat_info *mi = seq->private;
4189 struct bitmap *bitmap;
4191 if (v == (void*)1) {
4192 struct mdk_personality *pers;
4193 seq_printf(seq, "Personalities : ");
4194 spin_lock(&pers_lock);
4195 list_for_each_entry(pers, &pers_list, list)
4196 seq_printf(seq, "[%s] ", pers->name);
4198 spin_unlock(&pers_lock);
4199 seq_printf(seq, "\n");
4200 mi->event = atomic_read(&md_event_count);
4203 if (v == (void*)2) {
4208 if (mddev_lock(mddev)!=0)
4210 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4211 seq_printf(seq, "%s : %sactive", mdname(mddev),
4212 mddev->pers ? "" : "in");
4215 seq_printf(seq, " (read-only)");
4217 seq_printf(seq, "(auto-read-only)");
4218 seq_printf(seq, " %s", mddev->pers->name);
4222 ITERATE_RDEV(mddev,rdev,tmp2) {
4223 char b[BDEVNAME_SIZE];
4224 seq_printf(seq, " %s[%d]",
4225 bdevname(rdev->bdev,b), rdev->desc_nr);
4226 if (test_bit(WriteMostly, &rdev->flags))
4227 seq_printf(seq, "(W)");
4228 if (test_bit(Faulty, &rdev->flags)) {
4229 seq_printf(seq, "(F)");
4231 } else if (rdev->raid_disk < 0)
4232 seq_printf(seq, "(S)"); /* spare */
4236 if (!list_empty(&mddev->disks)) {
4238 seq_printf(seq, "\n %llu blocks",
4239 (unsigned long long)mddev->array_size);
4241 seq_printf(seq, "\n %llu blocks",
4242 (unsigned long long)size);
4244 if (mddev->persistent) {
4245 if (mddev->major_version != 0 ||
4246 mddev->minor_version != 90) {
4247 seq_printf(seq," super %d.%d",
4248 mddev->major_version,
4249 mddev->minor_version);
4252 seq_printf(seq, " super non-persistent");
4255 mddev->pers->status (seq, mddev);
4256 seq_printf(seq, "\n ");
4257 if (mddev->pers->sync_request) {
4258 if (mddev->curr_resync > 2) {
4259 status_resync (seq, mddev);
4260 seq_printf(seq, "\n ");
4261 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4262 seq_printf(seq, "\tresync=DELAYED\n ");
4263 else if (mddev->recovery_cp < MaxSector)
4264 seq_printf(seq, "\tresync=PENDING\n ");
4267 seq_printf(seq, "\n ");
4269 if ((bitmap = mddev->bitmap)) {
4270 unsigned long chunk_kb;
4271 unsigned long flags;
4272 spin_lock_irqsave(&bitmap->lock, flags);
4273 chunk_kb = bitmap->chunksize >> 10;
4274 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4276 bitmap->pages - bitmap->missing_pages,
4278 (bitmap->pages - bitmap->missing_pages)
4279 << (PAGE_SHIFT - 10),
4280 chunk_kb ? chunk_kb : bitmap->chunksize,
4281 chunk_kb ? "KB" : "B");
4283 seq_printf(seq, ", file: ");
4284 seq_path(seq, bitmap->file->f_vfsmnt,
4285 bitmap->file->f_dentry," \t\n");
4288 seq_printf(seq, "\n");
4289 spin_unlock_irqrestore(&bitmap->lock, flags);
4292 seq_printf(seq, "\n");
4294 mddev_unlock(mddev);
4299 static struct seq_operations md_seq_ops = {
4300 .start = md_seq_start,
4301 .next = md_seq_next,
4302 .stop = md_seq_stop,
4303 .show = md_seq_show,
4306 static int md_seq_open(struct inode *inode, struct file *file)
4309 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4313 error = seq_open(file, &md_seq_ops);
4317 struct seq_file *p = file->private_data;
4319 mi->event = atomic_read(&md_event_count);
4324 static int md_seq_release(struct inode *inode, struct file *file)
4326 struct seq_file *m = file->private_data;
4327 struct mdstat_info *mi = m->private;
4330 return seq_release(inode, file);
4333 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4335 struct seq_file *m = filp->private_data;
4336 struct mdstat_info *mi = m->private;
4339 poll_wait(filp, &md_event_waiters, wait);
4341 /* always allow read */
4342 mask = POLLIN | POLLRDNORM;
4344 if (mi->event != atomic_read(&md_event_count))
4345 mask |= POLLERR | POLLPRI;
4349 static struct file_operations md_seq_fops = {
4350 .open = md_seq_open,
4352 .llseek = seq_lseek,
4353 .release = md_seq_release,
4354 .poll = mdstat_poll,
4357 int register_md_personality(struct mdk_personality *p)
4359 spin_lock(&pers_lock);
4360 list_add_tail(&p->list, &pers_list);
4361 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
4362 spin_unlock(&pers_lock);
4366 int unregister_md_personality(struct mdk_personality *p)
4368 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
4369 spin_lock(&pers_lock);
4370 list_del_init(&p->list);
4371 spin_unlock(&pers_lock);
4375 static int is_mddev_idle(mddev_t *mddev)
4378 struct list_head *tmp;
4380 unsigned long curr_events;
4383 ITERATE_RDEV(mddev,rdev,tmp) {
4384 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
4385 curr_events = disk_stat_read(disk, sectors[0]) +
4386 disk_stat_read(disk, sectors[1]) -
4387 atomic_read(&disk->sync_io);
4388 /* The difference between curr_events and last_events
4389 * will be affected by any new non-sync IO (making
4390 * curr_events bigger) and any difference in the amount of
4391 * in-flight syncio (making current_events bigger or smaller)
4392 * The amount in-flight is currently limited to
4393 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4394 * which is at most 4096 sectors.
4395 * These numbers are fairly fragile and should be made
4396 * more robust, probably by enforcing the
4397 * 'window size' that md_do_sync sort-of uses.
4399 * Note: the following is an unsigned comparison.
4401 if ((curr_events - rdev->last_events + 4096) > 8192) {
4402 rdev->last_events = curr_events;
4409 void md_done_sync(mddev_t *mddev, int blocks, int ok)
4411 /* another "blocks" (512byte) blocks have been synced */
4412 atomic_sub(blocks, &mddev->recovery_active);
4413 wake_up(&mddev->recovery_wait);
4415 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4416 md_wakeup_thread(mddev->thread);
4417 // stop recovery, signal do_sync ....
4422 /* md_write_start(mddev, bi)
4423 * If we need to update some array metadata (e.g. 'active' flag
4424 * in superblock) before writing, schedule a superblock update
4425 * and wait for it to complete.
4427 void md_write_start(mddev_t *mddev, struct bio *bi)
4429 if (bio_data_dir(bi) != WRITE)
4432 BUG_ON(mddev->ro == 1);
4433 if (mddev->ro == 2) {
4434 /* need to switch to read/write */
4436 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4437 md_wakeup_thread(mddev->thread);
4439 atomic_inc(&mddev->writes_pending);
4440 if (mddev->in_sync) {
4441 spin_lock_irq(&mddev->write_lock);
4442 if (mddev->in_sync) {
4444 mddev->sb_dirty = 1;
4445 md_wakeup_thread(mddev->thread);
4447 spin_unlock_irq(&mddev->write_lock);
4449 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
4452 void md_write_end(mddev_t *mddev)
4454 if (atomic_dec_and_test(&mddev->writes_pending)) {
4455 if (mddev->safemode == 2)
4456 md_wakeup_thread(mddev->thread);
4458 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4462 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
4464 #define SYNC_MARKS 10
4465 #define SYNC_MARK_STEP (3*HZ)
4466 static void md_do_sync(mddev_t *mddev)
4469 unsigned int currspeed = 0,
4471 sector_t max_sectors,j, io_sectors;
4472 unsigned long mark[SYNC_MARKS];
4473 sector_t mark_cnt[SYNC_MARKS];
4475 struct list_head *tmp;
4476 sector_t last_check;
4479 /* just incase thread restarts... */
4480 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4483 /* we overload curr_resync somewhat here.
4484 * 0 == not engaged in resync at all
4485 * 2 == checking that there is no conflict with another sync
4486 * 1 == like 2, but have yielded to allow conflicting resync to
4488 * other == active in resync - this many blocks
4490 * Before starting a resync we must have set curr_resync to
4491 * 2, and then checked that every "conflicting" array has curr_resync
4492 * less than ours. When we find one that is the same or higher
4493 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4494 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4495 * This will mean we have to start checking from the beginning again.
4500 mddev->curr_resync = 2;
4503 if (kthread_should_stop()) {
4504 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4507 ITERATE_MDDEV(mddev2,tmp) {
4508 if (mddev2 == mddev)
4510 if (mddev2->curr_resync &&
4511 match_mddev_units(mddev,mddev2)) {
4513 if (mddev < mddev2 && mddev->curr_resync == 2) {
4514 /* arbitrarily yield */
4515 mddev->curr_resync = 1;
4516 wake_up(&resync_wait);
4518 if (mddev > mddev2 && mddev->curr_resync == 1)
4519 /* no need to wait here, we can wait the next
4520 * time 'round when curr_resync == 2
4523 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4524 if (!kthread_should_stop() &&
4525 mddev2->curr_resync >= mddev->curr_resync) {
4526 printk(KERN_INFO "md: delaying resync of %s"
4527 " until %s has finished resync (they"
4528 " share one or more physical units)\n",
4529 mdname(mddev), mdname(mddev2));
4532 finish_wait(&resync_wait, &wq);
4535 finish_wait(&resync_wait, &wq);
4538 } while (mddev->curr_resync < 2);
4540 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4541 /* resync follows the size requested by the personality,
4542 * which defaults to physical size, but can be virtual size
4544 max_sectors = mddev->resync_max_sectors;
4545 mddev->resync_mismatches = 0;
4547 /* recovery follows the physical size of devices */
4548 max_sectors = mddev->size << 1;
4550 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4551 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4552 " %d KB/sec/disc.\n", speed_min(mddev));
4553 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
4554 "(but not more than %d KB/sec) for reconstruction.\n",
4557 is_mddev_idle(mddev); /* this also initializes IO event counters */
4558 /* we don't use the checkpoint if there's a bitmap */
4559 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4560 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4561 j = mddev->recovery_cp;
4565 for (m = 0; m < SYNC_MARKS; m++) {
4567 mark_cnt[m] = io_sectors;
4570 mddev->resync_mark = mark[last_mark];
4571 mddev->resync_mark_cnt = mark_cnt[last_mark];
4574 * Tune reconstruction:
4576 window = 32*(PAGE_SIZE/512);
4577 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4578 window/2,(unsigned long long) max_sectors/2);
4580 atomic_set(&mddev->recovery_active, 0);
4581 init_waitqueue_head(&mddev->recovery_wait);
4586 "md: resuming recovery of %s from checkpoint.\n",
4588 mddev->curr_resync = j;
4591 while (j < max_sectors) {
4595 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4596 currspeed < speed_min(mddev));
4598 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4602 if (!skipped) { /* actual IO requested */
4603 io_sectors += sectors;
4604 atomic_add(sectors, &mddev->recovery_active);
4608 if (j>1) mddev->curr_resync = j;
4609 if (last_check == 0)
4610 /* this is the earliers that rebuilt will be
4611 * visible in /proc/mdstat
4613 md_new_event(mddev);
4615 if (last_check + window > io_sectors || j == max_sectors)
4618 last_check = io_sectors;
4620 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4621 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4625 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4627 int next = (last_mark+1) % SYNC_MARKS;
4629 mddev->resync_mark = mark[next];
4630 mddev->resync_mark_cnt = mark_cnt[next];
4631 mark[next] = jiffies;
4632 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
4637 if (kthread_should_stop()) {
4639 * got a signal, exit.
4642 "md: md_do_sync() got signal ... exiting\n");
4643 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4648 * this loop exits only if either when we are slower than
4649 * the 'hard' speed limit, or the system was IO-idle for
4651 * the system might be non-idle CPU-wise, but we only care
4652 * about not overloading the IO subsystem. (things like an
4653 * e2fsck being done on the RAID array should execute fast)
4655 mddev->queue->unplug_fn(mddev->queue);
4658 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4659 /((jiffies-mddev->resync_mark)/HZ +1) +1;
4661 if (currspeed > speed_min(mddev)) {
4662 if ((currspeed > speed_max(mddev)) ||
4663 !is_mddev_idle(mddev)) {
4669 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4671 * this also signals 'finished resyncing' to md_stop
4674 mddev->queue->unplug_fn(mddev->queue);
4676 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4678 /* tell personality that we are finished */
4679 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
4681 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4682 mddev->curr_resync > 2 &&
4683 mddev->curr_resync >= mddev->recovery_cp) {
4684 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4686 "md: checkpointing recovery of %s.\n",
4688 mddev->recovery_cp = mddev->curr_resync;
4690 mddev->recovery_cp = MaxSector;
4694 mddev->curr_resync = 0;
4695 wake_up(&resync_wait);
4696 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4697 md_wakeup_thread(mddev->thread);
4702 * This routine is regularly called by all per-raid-array threads to
4703 * deal with generic issues like resync and super-block update.
4704 * Raid personalities that don't have a thread (linear/raid0) do not
4705 * need this as they never do any recovery or update the superblock.
4707 * It does not do any resync itself, but rather "forks" off other threads
4708 * to do that as needed.
4709 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4710 * "->recovery" and create a thread at ->sync_thread.
4711 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4712 * and wakeups up this thread which will reap the thread and finish up.
4713 * This thread also removes any faulty devices (with nr_pending == 0).
4715 * The overall approach is:
4716 * 1/ if the superblock needs updating, update it.
4717 * 2/ If a recovery thread is running, don't do anything else.
4718 * 3/ If recovery has finished, clean up, possibly marking spares active.
4719 * 4/ If there are any faulty devices, remove them.
4720 * 5/ If array is degraded, try to add spares devices
4721 * 6/ If array has spares or is not in-sync, start a resync thread.
4723 void md_check_recovery(mddev_t *mddev)
4726 struct list_head *rtmp;
4730 bitmap_daemon_work(mddev->bitmap);
4735 if (signal_pending(current)) {
4736 if (mddev->pers->sync_request) {
4737 printk(KERN_INFO "md: %s in immediate safe mode\n",
4739 mddev->safemode = 2;
4741 flush_signals(current);
4746 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
4747 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4748 (mddev->safemode == 1) ||
4749 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4750 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
4754 if (mddev_trylock(mddev)==0) {
4757 spin_lock_irq(&mddev->write_lock);
4758 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4759 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4761 mddev->sb_dirty = 1;
4763 if (mddev->safemode == 1)
4764 mddev->safemode = 0;
4765 spin_unlock_irq(&mddev->write_lock);
4767 if (mddev->sb_dirty)
4768 md_update_sb(mddev);
4771 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4772 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4773 /* resync/recovery still happening */
4774 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4777 if (mddev->sync_thread) {
4778 /* resync has finished, collect result */
4779 md_unregister_thread(mddev->sync_thread);
4780 mddev->sync_thread = NULL;
4781 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4782 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4784 /* activate any spares */
4785 mddev->pers->spare_active(mddev);
4787 md_update_sb(mddev);
4789 /* if array is no-longer degraded, then any saved_raid_disk
4790 * information must be scrapped
4792 if (!mddev->degraded)
4793 ITERATE_RDEV(mddev,rdev,rtmp)
4794 rdev->saved_raid_disk = -1;
4796 mddev->recovery = 0;
4797 /* flag recovery needed just to double check */
4798 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4799 md_new_event(mddev);
4802 /* Clear some bits that don't mean anything, but
4805 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4806 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4807 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4808 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
4810 /* no recovery is running.
4811 * remove any failed drives, then
4812 * add spares if possible.
4813 * Spare are also removed and re-added, to allow
4814 * the personality to fail the re-add.
4816 ITERATE_RDEV(mddev,rdev,rtmp)
4817 if (rdev->raid_disk >= 0 &&
4818 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
4819 atomic_read(&rdev->nr_pending)==0) {
4820 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4822 sprintf(nm,"rd%d", rdev->raid_disk);
4823 sysfs_remove_link(&mddev->kobj, nm);
4824 rdev->raid_disk = -1;
4828 if (mddev->degraded) {
4829 ITERATE_RDEV(mddev,rdev,rtmp)
4830 if (rdev->raid_disk < 0
4831 && !test_bit(Faulty, &rdev->flags)) {
4832 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4834 sprintf(nm, "rd%d", rdev->raid_disk);
4835 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
4837 md_new_event(mddev);
4844 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4845 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4846 } else if (mddev->recovery_cp < MaxSector) {
4847 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4848 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4849 /* nothing to be done ... */
4852 if (mddev->pers->sync_request) {
4853 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4854 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4855 /* We are adding a device or devices to an array
4856 * which has the bitmap stored on all devices.
4857 * So make sure all bitmap pages get written
4859 bitmap_write_all(mddev->bitmap);
4861 mddev->sync_thread = md_register_thread(md_do_sync,
4864 if (!mddev->sync_thread) {
4865 printk(KERN_ERR "%s: could not start resync"
4868 /* leave the spares where they are, it shouldn't hurt */
4869 mddev->recovery = 0;
4871 md_wakeup_thread(mddev->sync_thread);
4872 md_new_event(mddev);
4875 mddev_unlock(mddev);
4879 static int md_notify_reboot(struct notifier_block *this,
4880 unsigned long code, void *x)
4882 struct list_head *tmp;
4885 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4887 printk(KERN_INFO "md: stopping all md devices.\n");
4889 ITERATE_MDDEV(mddev,tmp)
4890 if (mddev_trylock(mddev)==0)
4891 do_md_stop (mddev, 1);
4893 * certain more exotic SCSI devices are known to be
4894 * volatile wrt too early system reboots. While the
4895 * right place to handle this issue is the given
4896 * driver, we do want to have a safe RAID driver ...
4903 static struct notifier_block md_notifier = {
4904 .notifier_call = md_notify_reboot,
4906 .priority = INT_MAX, /* before any real devices */
4909 static void md_geninit(void)
4911 struct proc_dir_entry *p;
4913 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4915 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4917 p->proc_fops = &md_seq_fops;
4920 static int __init md_init(void)
4924 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4925 " MD_SB_DISKS=%d\n",
4926 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4927 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
4928 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
4931 if (register_blkdev(MAJOR_NR, "md"))
4933 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4934 unregister_blkdev(MAJOR_NR, "md");
4938 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4939 md_probe, NULL, NULL);
4940 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4941 md_probe, NULL, NULL);
4943 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4944 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4945 S_IFBLK|S_IRUSR|S_IWUSR,
4948 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4949 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4950 S_IFBLK|S_IRUSR|S_IWUSR,
4954 register_reboot_notifier(&md_notifier);
4955 raid_table_header = register_sysctl_table(raid_root_table, 1);
4965 * Searches all registered partitions for autorun RAID arrays
4968 static dev_t detected_devices[128];
4971 void md_autodetect_dev(dev_t dev)
4973 if (dev_cnt >= 0 && dev_cnt < 127)
4974 detected_devices[dev_cnt++] = dev;
4978 static void autostart_arrays(int part)
4983 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4985 for (i = 0; i < dev_cnt; i++) {
4986 dev_t dev = detected_devices[i];
4988 rdev = md_import_device(dev,0, 0);
4992 if (test_bit(Faulty, &rdev->flags)) {
4996 list_add(&rdev->same_set, &pending_raid_disks);
5000 autorun_devices(part);
5005 static __exit void md_exit(void)
5008 struct list_head *tmp;
5010 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
5011 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
5012 for (i=0; i < MAX_MD_DEVS; i++)
5013 devfs_remove("md/%d", i);
5014 for (i=0; i < MAX_MD_DEVS; i++)
5015 devfs_remove("md/d%d", i);
5019 unregister_blkdev(MAJOR_NR,"md");
5020 unregister_blkdev(mdp_major, "mdp");
5021 unregister_reboot_notifier(&md_notifier);
5022 unregister_sysctl_table(raid_table_header);
5023 remove_proc_entry("mdstat", NULL);
5024 ITERATE_MDDEV(mddev,tmp) {
5025 struct gendisk *disk = mddev->gendisk;
5028 export_array(mddev);
5031 mddev->gendisk = NULL;
5036 module_init(md_init)
5037 module_exit(md_exit)
5039 static int get_ro(char *buffer, struct kernel_param *kp)
5041 return sprintf(buffer, "%d", start_readonly);
5043 static int set_ro(const char *val, struct kernel_param *kp)
5046 int num = simple_strtoul(val, &e, 10);
5047 if (*val && (*e == '\0' || *e == '\n')) {
5048 start_readonly = num;
5054 module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
5055 module_param(start_dirty_degraded, int, 0644);
5058 EXPORT_SYMBOL(register_md_personality);
5059 EXPORT_SYMBOL(unregister_md_personality);
5060 EXPORT_SYMBOL(md_error);
5061 EXPORT_SYMBOL(md_done_sync);
5062 EXPORT_SYMBOL(md_write_start);
5063 EXPORT_SYMBOL(md_write_end);
5064 EXPORT_SYMBOL(md_register_thread);
5065 EXPORT_SYMBOL(md_unregister_thread);
5066 EXPORT_SYMBOL(md_wakeup_thread);
5067 EXPORT_SYMBOL(md_print_devices);
5068 EXPORT_SYMBOL(md_check_recovery);
5069 MODULE_LICENSE("GPL");
5071 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);