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);
901 } else if (test_bit(In_sync, &rdev2->flags)) {
902 d->state = (1<<MD_DISK_ACTIVE);
903 d->state |= (1<<MD_DISK_SYNC);
911 if (test_bit(WriteMostly, &rdev2->flags))
912 d->state |= (1<<MD_DISK_WRITEMOSTLY);
914 /* now set the "removed" and "faulty" bits on any missing devices */
915 for (i=0 ; i < mddev->raid_disks ; i++) {
916 mdp_disk_t *d = &sb->disks[i];
917 if (d->state == 0 && d->number == 0) {
920 d->state = (1<<MD_DISK_REMOVED);
921 d->state |= (1<<MD_DISK_FAULTY);
925 sb->nr_disks = nr_disks;
926 sb->active_disks = active;
927 sb->working_disks = working;
928 sb->failed_disks = failed;
929 sb->spare_disks = spare;
931 sb->this_disk = sb->disks[rdev->desc_nr];
932 sb->sb_csum = calc_sb_csum(sb);
936 * version 1 superblock
939 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
941 unsigned int disk_csum, csum;
942 unsigned long long newcsum;
943 int size = 256 + le32_to_cpu(sb->max_dev)*2;
944 unsigned int *isuper = (unsigned int*)sb;
947 disk_csum = sb->sb_csum;
950 for (i=0; size>=4; size -= 4 )
951 newcsum += le32_to_cpu(*isuper++);
954 newcsum += le16_to_cpu(*(unsigned short*) isuper);
956 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
957 sb->sb_csum = disk_csum;
958 return cpu_to_le32(csum);
961 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
963 struct mdp_superblock_1 *sb;
966 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
970 * Calculate the position of the superblock.
971 * It is always aligned to a 4K boundary and
972 * depeding on minor_version, it can be:
973 * 0: At least 8K, but less than 12K, from end of device
974 * 1: At start of device
975 * 2: 4K from start of device.
977 switch(minor_version) {
979 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
981 sb_offset &= ~(sector_t)(4*2-1);
982 /* convert from sectors to K */
994 rdev->sb_offset = sb_offset;
996 /* superblock is rarely larger than 1K, but it can be larger,
997 * and it is safe to read 4k, so we do that
999 ret = read_disk_sb(rdev, 4096);
1000 if (ret) return ret;
1003 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1005 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1006 sb->major_version != cpu_to_le32(1) ||
1007 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1008 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1009 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1012 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1013 printk("md: invalid superblock checksum on %s\n",
1014 bdevname(rdev->bdev,b));
1017 if (le64_to_cpu(sb->data_size) < 10) {
1018 printk("md: data_size too small on %s\n",
1019 bdevname(rdev->bdev,b));
1022 rdev->preferred_minor = 0xffff;
1023 rdev->data_offset = le64_to_cpu(sb->data_offset);
1024 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1026 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1027 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1028 if (rdev->sb_size & bmask)
1029 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1035 struct mdp_superblock_1 *refsb =
1036 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1038 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1039 sb->level != refsb->level ||
1040 sb->layout != refsb->layout ||
1041 sb->chunksize != refsb->chunksize) {
1042 printk(KERN_WARNING "md: %s has strangely different"
1043 " superblock to %s\n",
1044 bdevname(rdev->bdev,b),
1045 bdevname(refdev->bdev,b2));
1048 ev1 = le64_to_cpu(sb->events);
1049 ev2 = le64_to_cpu(refsb->events);
1057 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1059 rdev->size = rdev->sb_offset;
1060 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1062 rdev->size = le64_to_cpu(sb->data_size)/2;
1063 if (le32_to_cpu(sb->chunksize))
1064 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1066 if (le32_to_cpu(sb->size) > rdev->size*2)
1071 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1073 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1075 rdev->raid_disk = -1;
1077 if (mddev->raid_disks == 0) {
1078 mddev->major_version = 1;
1079 mddev->patch_version = 0;
1080 mddev->persistent = 1;
1081 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1082 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1083 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1084 mddev->level = le32_to_cpu(sb->level);
1085 mddev->clevel[0] = 0;
1086 mddev->layout = le32_to_cpu(sb->layout);
1087 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1088 mddev->size = le64_to_cpu(sb->size)/2;
1089 mddev->events = le64_to_cpu(sb->events);
1090 mddev->bitmap_offset = 0;
1091 mddev->default_bitmap_offset = 1024 >> 9;
1093 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1094 memcpy(mddev->uuid, sb->set_uuid, 16);
1096 mddev->max_disks = (4096-256)/2;
1098 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1099 mddev->bitmap_file == NULL ) {
1100 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1101 && mddev->level != 10) {
1102 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
1105 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1107 } else if (mddev->pers == NULL) {
1108 /* Insist of good event counter while assembling */
1109 __u64 ev1 = le64_to_cpu(sb->events);
1111 if (ev1 < mddev->events)
1113 } else if (mddev->bitmap) {
1114 /* If adding to array with a bitmap, then we can accept an
1115 * older device, but not too old.
1117 __u64 ev1 = le64_to_cpu(sb->events);
1118 if (ev1 < mddev->bitmap->events_cleared)
1120 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1123 if (mddev->level != LEVEL_MULTIPATH) {
1125 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1126 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1128 case 0xffff: /* spare */
1130 case 0xfffe: /* faulty */
1131 set_bit(Faulty, &rdev->flags);
1134 set_bit(In_sync, &rdev->flags);
1135 rdev->raid_disk = role;
1138 if (sb->devflags & WriteMostly1)
1139 set_bit(WriteMostly, &rdev->flags);
1140 } else /* MULTIPATH are always insync */
1141 set_bit(In_sync, &rdev->flags);
1146 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1148 struct mdp_superblock_1 *sb;
1149 struct list_head *tmp;
1152 /* make rdev->sb match mddev and rdev data. */
1154 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1156 sb->feature_map = 0;
1158 memset(sb->pad1, 0, sizeof(sb->pad1));
1159 memset(sb->pad2, 0, sizeof(sb->pad2));
1160 memset(sb->pad3, 0, sizeof(sb->pad3));
1162 sb->utime = cpu_to_le64((__u64)mddev->utime);
1163 sb->events = cpu_to_le64(mddev->events);
1165 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1167 sb->resync_offset = cpu_to_le64(0);
1169 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1171 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1172 sb->size = cpu_to_le64(mddev->size<<1);
1174 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1175 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1176 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1180 ITERATE_RDEV(mddev,rdev2,tmp)
1181 if (rdev2->desc_nr+1 > max_dev)
1182 max_dev = rdev2->desc_nr+1;
1184 sb->max_dev = cpu_to_le32(max_dev);
1185 for (i=0; i<max_dev;i++)
1186 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1188 ITERATE_RDEV(mddev,rdev2,tmp) {
1190 if (test_bit(Faulty, &rdev2->flags))
1191 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1192 else if (test_bit(In_sync, &rdev2->flags))
1193 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1195 sb->dev_roles[i] = cpu_to_le16(0xffff);
1198 sb->recovery_offset = cpu_to_le64(0); /* not supported yet */
1199 sb->sb_csum = calc_sb_1_csum(sb);
1203 static struct super_type super_types[] = {
1206 .owner = THIS_MODULE,
1207 .load_super = super_90_load,
1208 .validate_super = super_90_validate,
1209 .sync_super = super_90_sync,
1213 .owner = THIS_MODULE,
1214 .load_super = super_1_load,
1215 .validate_super = super_1_validate,
1216 .sync_super = super_1_sync,
1220 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1222 struct list_head *tmp;
1225 ITERATE_RDEV(mddev,rdev,tmp)
1226 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1232 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1234 struct list_head *tmp;
1237 ITERATE_RDEV(mddev1,rdev,tmp)
1238 if (match_dev_unit(mddev2, rdev))
1244 static LIST_HEAD(pending_raid_disks);
1246 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1248 mdk_rdev_t *same_pdev;
1249 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1257 /* make sure rdev->size exceeds mddev->size */
1258 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1260 /* Cannot change size, so fail */
1263 mddev->size = rdev->size;
1265 same_pdev = match_dev_unit(mddev, rdev);
1268 "%s: WARNING: %s appears to be on the same physical"
1269 " disk as %s. True\n protection against single-disk"
1270 " failure might be compromised.\n",
1271 mdname(mddev), bdevname(rdev->bdev,b),
1272 bdevname(same_pdev->bdev,b2));
1274 /* Verify rdev->desc_nr is unique.
1275 * If it is -1, assign a free number, else
1276 * check number is not in use
1278 if (rdev->desc_nr < 0) {
1280 if (mddev->pers) choice = mddev->raid_disks;
1281 while (find_rdev_nr(mddev, choice))
1283 rdev->desc_nr = choice;
1285 if (find_rdev_nr(mddev, rdev->desc_nr))
1288 bdevname(rdev->bdev,b);
1289 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1291 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1294 list_add(&rdev->same_set, &mddev->disks);
1295 rdev->mddev = mddev;
1296 printk(KERN_INFO "md: bind<%s>\n", b);
1298 rdev->kobj.parent = &mddev->kobj;
1299 kobject_add(&rdev->kobj);
1301 if (rdev->bdev->bd_part)
1302 ko = &rdev->bdev->bd_part->kobj;
1304 ko = &rdev->bdev->bd_disk->kobj;
1305 sysfs_create_link(&rdev->kobj, ko, "block");
1306 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1310 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1312 char b[BDEVNAME_SIZE];
1317 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1318 list_del_init(&rdev->same_set);
1319 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1321 sysfs_remove_link(&rdev->kobj, "block");
1322 kobject_del(&rdev->kobj);
1326 * prevent the device from being mounted, repartitioned or
1327 * otherwise reused by a RAID array (or any other kernel
1328 * subsystem), by bd_claiming the device.
1330 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1333 struct block_device *bdev;
1334 char b[BDEVNAME_SIZE];
1336 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1338 printk(KERN_ERR "md: could not open %s.\n",
1339 __bdevname(dev, b));
1340 return PTR_ERR(bdev);
1342 err = bd_claim(bdev, rdev);
1344 printk(KERN_ERR "md: could not bd_claim %s.\n",
1353 static void unlock_rdev(mdk_rdev_t *rdev)
1355 struct block_device *bdev = rdev->bdev;
1363 void md_autodetect_dev(dev_t dev);
1365 static void export_rdev(mdk_rdev_t * rdev)
1367 char b[BDEVNAME_SIZE];
1368 printk(KERN_INFO "md: export_rdev(%s)\n",
1369 bdevname(rdev->bdev,b));
1373 list_del_init(&rdev->same_set);
1375 md_autodetect_dev(rdev->bdev->bd_dev);
1378 kobject_put(&rdev->kobj);
1381 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1383 unbind_rdev_from_array(rdev);
1387 static void export_array(mddev_t *mddev)
1389 struct list_head *tmp;
1392 ITERATE_RDEV(mddev,rdev,tmp) {
1397 kick_rdev_from_array(rdev);
1399 if (!list_empty(&mddev->disks))
1401 mddev->raid_disks = 0;
1402 mddev->major_version = 0;
1405 static void print_desc(mdp_disk_t *desc)
1407 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1408 desc->major,desc->minor,desc->raid_disk,desc->state);
1411 static void print_sb(mdp_super_t *sb)
1416 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1417 sb->major_version, sb->minor_version, sb->patch_version,
1418 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1420 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1421 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1422 sb->md_minor, sb->layout, sb->chunk_size);
1423 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1424 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1425 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1426 sb->failed_disks, sb->spare_disks,
1427 sb->sb_csum, (unsigned long)sb->events_lo);
1430 for (i = 0; i < MD_SB_DISKS; i++) {
1433 desc = sb->disks + i;
1434 if (desc->number || desc->major || desc->minor ||
1435 desc->raid_disk || (desc->state && (desc->state != 4))) {
1436 printk(" D %2d: ", i);
1440 printk(KERN_INFO "md: THIS: ");
1441 print_desc(&sb->this_disk);
1445 static void print_rdev(mdk_rdev_t *rdev)
1447 char b[BDEVNAME_SIZE];
1448 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1449 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1450 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1452 if (rdev->sb_loaded) {
1453 printk(KERN_INFO "md: rdev superblock:\n");
1454 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1456 printk(KERN_INFO "md: no rdev superblock!\n");
1459 void md_print_devices(void)
1461 struct list_head *tmp, *tmp2;
1464 char b[BDEVNAME_SIZE];
1467 printk("md: **********************************\n");
1468 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1469 printk("md: **********************************\n");
1470 ITERATE_MDDEV(mddev,tmp) {
1473 bitmap_print_sb(mddev->bitmap);
1475 printk("%s: ", mdname(mddev));
1476 ITERATE_RDEV(mddev,rdev,tmp2)
1477 printk("<%s>", bdevname(rdev->bdev,b));
1480 ITERATE_RDEV(mddev,rdev,tmp2)
1483 printk("md: **********************************\n");
1488 static void sync_sbs(mddev_t * mddev)
1491 struct list_head *tmp;
1493 ITERATE_RDEV(mddev,rdev,tmp) {
1494 super_types[mddev->major_version].
1495 sync_super(mddev, rdev);
1496 rdev->sb_loaded = 1;
1500 static void md_update_sb(mddev_t * mddev)
1503 struct list_head *tmp;
1508 spin_lock_irq(&mddev->write_lock);
1509 sync_req = mddev->in_sync;
1510 mddev->utime = get_seconds();
1513 if (!mddev->events) {
1515 * oops, this 64-bit counter should never wrap.
1516 * Either we are in around ~1 trillion A.C., assuming
1517 * 1 reboot per second, or we have a bug:
1522 mddev->sb_dirty = 2;
1526 * do not write anything to disk if using
1527 * nonpersistent superblocks
1529 if (!mddev->persistent) {
1530 mddev->sb_dirty = 0;
1531 spin_unlock_irq(&mddev->write_lock);
1532 wake_up(&mddev->sb_wait);
1535 spin_unlock_irq(&mddev->write_lock);
1538 "md: updating %s RAID superblock on device (in sync %d)\n",
1539 mdname(mddev),mddev->in_sync);
1541 err = bitmap_update_sb(mddev->bitmap);
1542 ITERATE_RDEV(mddev,rdev,tmp) {
1543 char b[BDEVNAME_SIZE];
1544 dprintk(KERN_INFO "md: ");
1545 if (test_bit(Faulty, &rdev->flags))
1546 dprintk("(skipping faulty ");
1548 dprintk("%s ", bdevname(rdev->bdev,b));
1549 if (!test_bit(Faulty, &rdev->flags)) {
1550 md_super_write(mddev,rdev,
1551 rdev->sb_offset<<1, rdev->sb_size,
1553 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1554 bdevname(rdev->bdev,b),
1555 (unsigned long long)rdev->sb_offset);
1559 if (mddev->level == LEVEL_MULTIPATH)
1560 /* only need to write one superblock... */
1563 md_super_wait(mddev);
1564 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1566 spin_lock_irq(&mddev->write_lock);
1567 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
1568 /* have to write it out again */
1569 spin_unlock_irq(&mddev->write_lock);
1572 mddev->sb_dirty = 0;
1573 spin_unlock_irq(&mddev->write_lock);
1574 wake_up(&mddev->sb_wait);
1578 /* words written to sysfs files may, or my not, be \n terminated.
1579 * We want to accept with case. For this we use cmd_match.
1581 static int cmd_match(const char *cmd, const char *str)
1583 /* See if cmd, written into a sysfs file, matches
1584 * str. They must either be the same, or cmd can
1585 * have a trailing newline
1587 while (*cmd && *str && *cmd == *str) {
1598 struct rdev_sysfs_entry {
1599 struct attribute attr;
1600 ssize_t (*show)(mdk_rdev_t *, char *);
1601 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1605 state_show(mdk_rdev_t *rdev, char *page)
1610 if (test_bit(Faulty, &rdev->flags)) {
1611 len+= sprintf(page+len, "%sfaulty",sep);
1614 if (test_bit(In_sync, &rdev->flags)) {
1615 len += sprintf(page+len, "%sin_sync",sep);
1618 if (!test_bit(Faulty, &rdev->flags) &&
1619 !test_bit(In_sync, &rdev->flags)) {
1620 len += sprintf(page+len, "%sspare", sep);
1623 return len+sprintf(page+len, "\n");
1626 static struct rdev_sysfs_entry
1627 rdev_state = __ATTR_RO(state);
1630 super_show(mdk_rdev_t *rdev, char *page)
1632 if (rdev->sb_loaded && rdev->sb_size) {
1633 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1634 return rdev->sb_size;
1638 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1641 errors_show(mdk_rdev_t *rdev, char *page)
1643 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1647 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1650 unsigned long n = simple_strtoul(buf, &e, 10);
1651 if (*buf && (*e == 0 || *e == '\n')) {
1652 atomic_set(&rdev->corrected_errors, n);
1657 static struct rdev_sysfs_entry rdev_errors =
1658 __ATTR(errors, 0644, errors_show, errors_store);
1661 slot_show(mdk_rdev_t *rdev, char *page)
1663 if (rdev->raid_disk < 0)
1664 return sprintf(page, "none\n");
1666 return sprintf(page, "%d\n", rdev->raid_disk);
1670 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1673 int slot = simple_strtoul(buf, &e, 10);
1674 if (strncmp(buf, "none", 4)==0)
1676 else if (e==buf || (*e && *e!= '\n'))
1678 if (rdev->mddev->pers)
1679 /* Cannot set slot in active array (yet) */
1681 if (slot >= rdev->mddev->raid_disks)
1683 rdev->raid_disk = slot;
1684 /* assume it is working */
1686 set_bit(In_sync, &rdev->flags);
1691 static struct rdev_sysfs_entry rdev_slot =
1692 __ATTR(slot, 0644, slot_show, slot_store);
1695 offset_show(mdk_rdev_t *rdev, char *page)
1697 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1701 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1704 unsigned long long offset = simple_strtoull(buf, &e, 10);
1705 if (e==buf || (*e && *e != '\n'))
1707 if (rdev->mddev->pers)
1709 rdev->data_offset = offset;
1713 static struct rdev_sysfs_entry rdev_offset =
1714 __ATTR(offset, 0644, offset_show, offset_store);
1717 rdev_size_show(mdk_rdev_t *rdev, char *page)
1719 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1723 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1726 unsigned long long size = simple_strtoull(buf, &e, 10);
1727 if (e==buf || (*e && *e != '\n'))
1729 if (rdev->mddev->pers)
1732 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1733 rdev->mddev->size = size;
1737 static struct rdev_sysfs_entry rdev_size =
1738 __ATTR(size, 0644, rdev_size_show, rdev_size_store);
1740 static struct attribute *rdev_default_attrs[] = {
1750 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1752 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1753 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1757 return entry->show(rdev, page);
1761 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1762 const char *page, size_t length)
1764 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1765 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1769 return entry->store(rdev, page, length);
1772 static void rdev_free(struct kobject *ko)
1774 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1777 static struct sysfs_ops rdev_sysfs_ops = {
1778 .show = rdev_attr_show,
1779 .store = rdev_attr_store,
1781 static struct kobj_type rdev_ktype = {
1782 .release = rdev_free,
1783 .sysfs_ops = &rdev_sysfs_ops,
1784 .default_attrs = rdev_default_attrs,
1788 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1790 * mark the device faulty if:
1792 * - the device is nonexistent (zero size)
1793 * - the device has no valid superblock
1795 * a faulty rdev _never_ has rdev->sb set.
1797 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1799 char b[BDEVNAME_SIZE];
1804 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1806 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1807 return ERR_PTR(-ENOMEM);
1810 if ((err = alloc_disk_sb(rdev)))
1813 err = lock_rdev(rdev, newdev);
1817 rdev->kobj.parent = NULL;
1818 rdev->kobj.ktype = &rdev_ktype;
1819 kobject_init(&rdev->kobj);
1823 rdev->data_offset = 0;
1824 atomic_set(&rdev->nr_pending, 0);
1825 atomic_set(&rdev->read_errors, 0);
1826 atomic_set(&rdev->corrected_errors, 0);
1828 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1831 "md: %s has zero or unknown size, marking faulty!\n",
1832 bdevname(rdev->bdev,b));
1837 if (super_format >= 0) {
1838 err = super_types[super_format].
1839 load_super(rdev, NULL, super_minor);
1840 if (err == -EINVAL) {
1842 "md: %s has invalid sb, not importing!\n",
1843 bdevname(rdev->bdev,b));
1848 "md: could not read %s's sb, not importing!\n",
1849 bdevname(rdev->bdev,b));
1853 INIT_LIST_HEAD(&rdev->same_set);
1858 if (rdev->sb_page) {
1864 return ERR_PTR(err);
1868 * Check a full RAID array for plausibility
1872 static void analyze_sbs(mddev_t * mddev)
1875 struct list_head *tmp;
1876 mdk_rdev_t *rdev, *freshest;
1877 char b[BDEVNAME_SIZE];
1880 ITERATE_RDEV(mddev,rdev,tmp)
1881 switch (super_types[mddev->major_version].
1882 load_super(rdev, freshest, mddev->minor_version)) {
1890 "md: fatal superblock inconsistency in %s"
1891 " -- removing from array\n",
1892 bdevname(rdev->bdev,b));
1893 kick_rdev_from_array(rdev);
1897 super_types[mddev->major_version].
1898 validate_super(mddev, freshest);
1901 ITERATE_RDEV(mddev,rdev,tmp) {
1902 if (rdev != freshest)
1903 if (super_types[mddev->major_version].
1904 validate_super(mddev, rdev)) {
1905 printk(KERN_WARNING "md: kicking non-fresh %s"
1907 bdevname(rdev->bdev,b));
1908 kick_rdev_from_array(rdev);
1911 if (mddev->level == LEVEL_MULTIPATH) {
1912 rdev->desc_nr = i++;
1913 rdev->raid_disk = rdev->desc_nr;
1914 set_bit(In_sync, &rdev->flags);
1920 if (mddev->recovery_cp != MaxSector &&
1922 printk(KERN_ERR "md: %s: raid array is not clean"
1923 " -- starting background reconstruction\n",
1929 level_show(mddev_t *mddev, char *page)
1931 struct mdk_personality *p = mddev->pers;
1933 return sprintf(page, "%s\n", p->name);
1934 else if (mddev->clevel[0])
1935 return sprintf(page, "%s\n", mddev->clevel);
1936 else if (mddev->level != LEVEL_NONE)
1937 return sprintf(page, "%d\n", mddev->level);
1943 level_store(mddev_t *mddev, const char *buf, size_t len)
1950 if (len >= sizeof(mddev->clevel))
1952 strncpy(mddev->clevel, buf, len);
1953 if (mddev->clevel[len-1] == '\n')
1955 mddev->clevel[len] = 0;
1956 mddev->level = LEVEL_NONE;
1960 static struct md_sysfs_entry md_level =
1961 __ATTR(level, 0644, level_show, level_store);
1964 raid_disks_show(mddev_t *mddev, char *page)
1966 if (mddev->raid_disks == 0)
1968 return sprintf(page, "%d\n", mddev->raid_disks);
1971 static int update_raid_disks(mddev_t *mddev, int raid_disks);
1974 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
1976 /* can only set raid_disks if array is not yet active */
1979 unsigned long n = simple_strtoul(buf, &e, 10);
1981 if (!*buf || (*e && *e != '\n'))
1985 rv = update_raid_disks(mddev, n);
1987 mddev->raid_disks = n;
1988 return rv ? rv : len;
1990 static struct md_sysfs_entry md_raid_disks =
1991 __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
1994 chunk_size_show(mddev_t *mddev, char *page)
1996 return sprintf(page, "%d\n", mddev->chunk_size);
2000 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2002 /* can only set chunk_size if array is not yet active */
2004 unsigned long n = simple_strtoul(buf, &e, 10);
2008 if (!*buf || (*e && *e != '\n'))
2011 mddev->chunk_size = n;
2014 static struct md_sysfs_entry md_chunk_size =
2015 __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2018 null_show(mddev_t *mddev, char *page)
2024 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2026 /* buf must be %d:%d\n? giving major and minor numbers */
2027 /* The new device is added to the array.
2028 * If the array has a persistent superblock, we read the
2029 * superblock to initialise info and check validity.
2030 * Otherwise, only checking done is that in bind_rdev_to_array,
2031 * which mainly checks size.
2034 int major = simple_strtoul(buf, &e, 10);
2040 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2042 minor = simple_strtoul(e+1, &e, 10);
2043 if (*e && *e != '\n')
2045 dev = MKDEV(major, minor);
2046 if (major != MAJOR(dev) ||
2047 minor != MINOR(dev))
2051 if (mddev->persistent) {
2052 rdev = md_import_device(dev, mddev->major_version,
2053 mddev->minor_version);
2054 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2055 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2056 mdk_rdev_t, same_set);
2057 err = super_types[mddev->major_version]
2058 .load_super(rdev, rdev0, mddev->minor_version);
2063 rdev = md_import_device(dev, -1, -1);
2066 return PTR_ERR(rdev);
2067 err = bind_rdev_to_array(rdev, mddev);
2071 return err ? err : len;
2074 static struct md_sysfs_entry md_new_device =
2075 __ATTR(new_dev, 0200, null_show, new_dev_store);
2078 size_show(mddev_t *mddev, char *page)
2080 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2083 static int update_size(mddev_t *mddev, unsigned long size);
2086 size_store(mddev_t *mddev, const char *buf, size_t len)
2088 /* If array is inactive, we can reduce the component size, but
2089 * not increase it (except from 0).
2090 * If array is active, we can try an on-line resize
2094 unsigned long long size = simple_strtoull(buf, &e, 10);
2095 if (!*buf || *buf == '\n' ||
2100 err = update_size(mddev, size);
2101 md_update_sb(mddev);
2103 if (mddev->size == 0 ||
2109 return err ? err : len;
2112 static struct md_sysfs_entry md_size =
2113 __ATTR(component_size, 0644, size_show, size_store);
2117 * This is either 'none' for arrays with externally managed metadata,
2118 * or N.M for internally known formats
2121 metadata_show(mddev_t *mddev, char *page)
2123 if (mddev->persistent)
2124 return sprintf(page, "%d.%d\n",
2125 mddev->major_version, mddev->minor_version);
2127 return sprintf(page, "none\n");
2131 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2135 if (!list_empty(&mddev->disks))
2138 if (cmd_match(buf, "none")) {
2139 mddev->persistent = 0;
2140 mddev->major_version = 0;
2141 mddev->minor_version = 90;
2144 major = simple_strtoul(buf, &e, 10);
2145 if (e==buf || *e != '.')
2148 minor = simple_strtoul(buf, &e, 10);
2149 if (e==buf || *e != '\n')
2151 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2152 super_types[major].name == NULL)
2154 mddev->major_version = major;
2155 mddev->minor_version = minor;
2156 mddev->persistent = 1;
2160 static struct md_sysfs_entry md_metadata =
2161 __ATTR(metadata_version, 0644, metadata_show, metadata_store);
2164 action_show(mddev_t *mddev, char *page)
2166 char *type = "idle";
2167 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2168 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2169 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2170 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2172 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2179 return sprintf(page, "%s\n", type);
2183 action_store(mddev_t *mddev, const char *page, size_t len)
2185 if (!mddev->pers || !mddev->pers->sync_request)
2188 if (cmd_match(page, "idle")) {
2189 if (mddev->sync_thread) {
2190 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2191 md_unregister_thread(mddev->sync_thread);
2192 mddev->sync_thread = NULL;
2193 mddev->recovery = 0;
2195 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2196 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2198 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2199 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2201 if (cmd_match(page, "check"))
2202 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2203 else if (cmd_match(page, "repair"))
2205 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2206 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2208 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2209 md_wakeup_thread(mddev->thread);
2214 mismatch_cnt_show(mddev_t *mddev, char *page)
2216 return sprintf(page, "%llu\n",
2217 (unsigned long long) mddev->resync_mismatches);
2220 static struct md_sysfs_entry
2221 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2224 static struct md_sysfs_entry
2225 md_mismatches = __ATTR_RO(mismatch_cnt);
2228 sync_min_show(mddev_t *mddev, char *page)
2230 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2231 mddev->sync_speed_min ? "local": "system");
2235 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2239 if (strncmp(buf, "system", 6)==0) {
2240 mddev->sync_speed_min = 0;
2243 min = simple_strtoul(buf, &e, 10);
2244 if (buf == e || (*e && *e != '\n') || min <= 0)
2246 mddev->sync_speed_min = min;
2250 static struct md_sysfs_entry md_sync_min =
2251 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2254 sync_max_show(mddev_t *mddev, char *page)
2256 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2257 mddev->sync_speed_max ? "local": "system");
2261 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2265 if (strncmp(buf, "system", 6)==0) {
2266 mddev->sync_speed_max = 0;
2269 max = simple_strtoul(buf, &e, 10);
2270 if (buf == e || (*e && *e != '\n') || max <= 0)
2272 mddev->sync_speed_max = max;
2276 static struct md_sysfs_entry md_sync_max =
2277 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2281 sync_speed_show(mddev_t *mddev, char *page)
2283 unsigned long resync, dt, db;
2284 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2285 dt = ((jiffies - mddev->resync_mark) / HZ);
2287 db = resync - (mddev->resync_mark_cnt);
2288 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2291 static struct md_sysfs_entry
2292 md_sync_speed = __ATTR_RO(sync_speed);
2295 sync_completed_show(mddev_t *mddev, char *page)
2297 unsigned long max_blocks, resync;
2299 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2300 max_blocks = mddev->resync_max_sectors;
2302 max_blocks = mddev->size << 1;
2304 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2305 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2308 static struct md_sysfs_entry
2309 md_sync_completed = __ATTR_RO(sync_completed);
2311 static struct attribute *md_default_attrs[] = {
2313 &md_raid_disks.attr,
2314 &md_chunk_size.attr,
2317 &md_new_device.attr,
2321 static struct attribute *md_redundancy_attrs[] = {
2323 &md_mismatches.attr,
2326 &md_sync_speed.attr,
2327 &md_sync_completed.attr,
2330 static struct attribute_group md_redundancy_group = {
2332 .attrs = md_redundancy_attrs,
2337 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2339 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2340 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2346 rv = entry->show(mddev, page);
2347 mddev_unlock(mddev);
2352 md_attr_store(struct kobject *kobj, struct attribute *attr,
2353 const char *page, size_t length)
2355 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2356 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2362 rv = entry->store(mddev, page, length);
2363 mddev_unlock(mddev);
2367 static void md_free(struct kobject *ko)
2369 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2373 static struct sysfs_ops md_sysfs_ops = {
2374 .show = md_attr_show,
2375 .store = md_attr_store,
2377 static struct kobj_type md_ktype = {
2379 .sysfs_ops = &md_sysfs_ops,
2380 .default_attrs = md_default_attrs,
2385 static struct kobject *md_probe(dev_t dev, int *part, void *data)
2387 static DECLARE_MUTEX(disks_sem);
2388 mddev_t *mddev = mddev_find(dev);
2389 struct gendisk *disk;
2390 int partitioned = (MAJOR(dev) != MD_MAJOR);
2391 int shift = partitioned ? MdpMinorShift : 0;
2392 int unit = MINOR(dev) >> shift;
2398 if (mddev->gendisk) {
2403 disk = alloc_disk(1 << shift);
2409 disk->major = MAJOR(dev);
2410 disk->first_minor = unit << shift;
2412 sprintf(disk->disk_name, "md_d%d", unit);
2413 sprintf(disk->devfs_name, "md/d%d", unit);
2415 sprintf(disk->disk_name, "md%d", unit);
2416 sprintf(disk->devfs_name, "md/%d", unit);
2418 disk->fops = &md_fops;
2419 disk->private_data = mddev;
2420 disk->queue = mddev->queue;
2422 mddev->gendisk = disk;
2424 mddev->kobj.parent = &disk->kobj;
2425 mddev->kobj.k_name = NULL;
2426 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2427 mddev->kobj.ktype = &md_ktype;
2428 kobject_register(&mddev->kobj);
2432 void md_wakeup_thread(mdk_thread_t *thread);
2434 static void md_safemode_timeout(unsigned long data)
2436 mddev_t *mddev = (mddev_t *) data;
2438 mddev->safemode = 1;
2439 md_wakeup_thread(mddev->thread);
2442 static int start_dirty_degraded;
2444 static int do_md_run(mddev_t * mddev)
2448 struct list_head *tmp;
2450 struct gendisk *disk;
2451 struct mdk_personality *pers;
2452 char b[BDEVNAME_SIZE];
2454 if (list_empty(&mddev->disks))
2455 /* cannot run an array with no devices.. */
2462 * Analyze all RAID superblock(s)
2464 if (!mddev->raid_disks)
2467 chunk_size = mddev->chunk_size;
2470 if (chunk_size > MAX_CHUNK_SIZE) {
2471 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2472 chunk_size, MAX_CHUNK_SIZE);
2476 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2478 if ( (1 << ffz(~chunk_size)) != chunk_size) {
2479 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
2482 if (chunk_size < PAGE_SIZE) {
2483 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2484 chunk_size, PAGE_SIZE);
2488 /* devices must have minimum size of one chunk */
2489 ITERATE_RDEV(mddev,rdev,tmp) {
2490 if (test_bit(Faulty, &rdev->flags))
2492 if (rdev->size < chunk_size / 1024) {
2494 "md: Dev %s smaller than chunk_size:"
2496 bdevname(rdev->bdev,b),
2497 (unsigned long long)rdev->size,
2505 if (mddev->level != LEVEL_NONE)
2506 request_module("md-level-%d", mddev->level);
2507 else if (mddev->clevel[0])
2508 request_module("md-%s", mddev->clevel);
2512 * Drop all container device buffers, from now on
2513 * the only valid external interface is through the md
2515 * Also find largest hardsector size
2517 ITERATE_RDEV(mddev,rdev,tmp) {
2518 if (test_bit(Faulty, &rdev->flags))
2520 sync_blockdev(rdev->bdev);
2521 invalidate_bdev(rdev->bdev, 0);
2524 md_probe(mddev->unit, NULL, NULL);
2525 disk = mddev->gendisk;
2529 spin_lock(&pers_lock);
2530 pers = find_pers(mddev->level, mddev->clevel);
2531 if (!pers || !try_module_get(pers->owner)) {
2532 spin_unlock(&pers_lock);
2533 if (mddev->level != LEVEL_NONE)
2534 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2537 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2542 spin_unlock(&pers_lock);
2543 mddev->level = pers->level;
2544 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2546 mddev->recovery = 0;
2547 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
2548 mddev->barriers_work = 1;
2549 mddev->ok_start_degraded = start_dirty_degraded;
2552 mddev->ro = 2; /* read-only, but switch on first write */
2554 err = mddev->pers->run(mddev);
2555 if (!err && mddev->pers->sync_request) {
2556 err = bitmap_create(mddev);
2558 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2559 mdname(mddev), err);
2560 mddev->pers->stop(mddev);
2564 printk(KERN_ERR "md: pers->run() failed ...\n");
2565 module_put(mddev->pers->owner);
2567 bitmap_destroy(mddev);
2570 if (mddev->pers->sync_request)
2571 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
2572 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2575 atomic_set(&mddev->writes_pending,0);
2576 mddev->safemode = 0;
2577 mddev->safemode_timer.function = md_safemode_timeout;
2578 mddev->safemode_timer.data = (unsigned long) mddev;
2579 mddev->safemode_delay = (20 * HZ)/1000 +1; /* 20 msec delay */
2582 ITERATE_RDEV(mddev,rdev,tmp)
2583 if (rdev->raid_disk >= 0) {
2585 sprintf(nm, "rd%d", rdev->raid_disk);
2586 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2589 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2590 md_wakeup_thread(mddev->thread);
2592 if (mddev->sb_dirty)
2593 md_update_sb(mddev);
2595 set_capacity(disk, mddev->array_size<<1);
2597 /* If we call blk_queue_make_request here, it will
2598 * re-initialise max_sectors etc which may have been
2599 * refined inside -> run. So just set the bits we need to set.
2600 * Most initialisation happended when we called
2601 * blk_queue_make_request(..., md_fail_request)
2604 mddev->queue->queuedata = mddev;
2605 mddev->queue->make_request_fn = mddev->pers->make_request;
2608 md_new_event(mddev);
2612 static int restart_array(mddev_t *mddev)
2614 struct gendisk *disk = mddev->gendisk;
2618 * Complain if it has no devices
2621 if (list_empty(&mddev->disks))
2629 mddev->safemode = 0;
2631 set_disk_ro(disk, 0);
2633 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2636 * Kick recovery or resync if necessary
2638 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2639 md_wakeup_thread(mddev->thread);
2642 printk(KERN_ERR "md: %s has no personality assigned.\n",
2651 static int do_md_stop(mddev_t * mddev, int ro)
2654 struct gendisk *disk = mddev->gendisk;
2657 if (atomic_read(&mddev->active)>2) {
2658 printk("md: %s still in use.\n",mdname(mddev));
2662 if (mddev->sync_thread) {
2663 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2664 md_unregister_thread(mddev->sync_thread);
2665 mddev->sync_thread = NULL;
2668 del_timer_sync(&mddev->safemode_timer);
2670 invalidate_partition(disk, 0);
2678 bitmap_flush(mddev);
2679 md_super_wait(mddev);
2681 set_disk_ro(disk, 0);
2682 blk_queue_make_request(mddev->queue, md_fail_request);
2683 mddev->pers->stop(mddev);
2684 if (mddev->pers->sync_request)
2685 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2687 module_put(mddev->pers->owner);
2692 if (!mddev->in_sync) {
2693 /* mark array as shutdown cleanly */
2695 md_update_sb(mddev);
2698 set_disk_ro(disk, 1);
2702 * Free resources if final stop
2706 struct list_head *tmp;
2707 struct gendisk *disk;
2708 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2710 bitmap_destroy(mddev);
2711 if (mddev->bitmap_file) {
2712 atomic_set(&mddev->bitmap_file->f_dentry->d_inode->i_writecount, 1);
2713 fput(mddev->bitmap_file);
2714 mddev->bitmap_file = NULL;
2716 mddev->bitmap_offset = 0;
2718 ITERATE_RDEV(mddev,rdev,tmp)
2719 if (rdev->raid_disk >= 0) {
2721 sprintf(nm, "rd%d", rdev->raid_disk);
2722 sysfs_remove_link(&mddev->kobj, nm);
2725 export_array(mddev);
2727 mddev->array_size = 0;
2728 disk = mddev->gendisk;
2730 set_capacity(disk, 0);
2733 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2736 md_new_event(mddev);
2741 static void autorun_array(mddev_t *mddev)
2744 struct list_head *tmp;
2747 if (list_empty(&mddev->disks))
2750 printk(KERN_INFO "md: running: ");
2752 ITERATE_RDEV(mddev,rdev,tmp) {
2753 char b[BDEVNAME_SIZE];
2754 printk("<%s>", bdevname(rdev->bdev,b));
2758 err = do_md_run (mddev);
2760 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
2761 do_md_stop (mddev, 0);
2766 * lets try to run arrays based on all disks that have arrived
2767 * until now. (those are in pending_raid_disks)
2769 * the method: pick the first pending disk, collect all disks with
2770 * the same UUID, remove all from the pending list and put them into
2771 * the 'same_array' list. Then order this list based on superblock
2772 * update time (freshest comes first), kick out 'old' disks and
2773 * compare superblocks. If everything's fine then run it.
2775 * If "unit" is allocated, then bump its reference count
2777 static void autorun_devices(int part)
2779 struct list_head candidates;
2780 struct list_head *tmp;
2781 mdk_rdev_t *rdev0, *rdev;
2783 char b[BDEVNAME_SIZE];
2785 printk(KERN_INFO "md: autorun ...\n");
2786 while (!list_empty(&pending_raid_disks)) {
2788 rdev0 = list_entry(pending_raid_disks.next,
2789 mdk_rdev_t, same_set);
2791 printk(KERN_INFO "md: considering %s ...\n",
2792 bdevname(rdev0->bdev,b));
2793 INIT_LIST_HEAD(&candidates);
2794 ITERATE_RDEV_PENDING(rdev,tmp)
2795 if (super_90_load(rdev, rdev0, 0) >= 0) {
2796 printk(KERN_INFO "md: adding %s ...\n",
2797 bdevname(rdev->bdev,b));
2798 list_move(&rdev->same_set, &candidates);
2801 * now we have a set of devices, with all of them having
2802 * mostly sane superblocks. It's time to allocate the
2805 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
2806 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
2807 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
2811 dev = MKDEV(mdp_major,
2812 rdev0->preferred_minor << MdpMinorShift);
2814 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
2816 md_probe(dev, NULL, NULL);
2817 mddev = mddev_find(dev);
2820 "md: cannot allocate memory for md drive.\n");
2823 if (mddev_lock(mddev))
2824 printk(KERN_WARNING "md: %s locked, cannot run\n",
2826 else if (mddev->raid_disks || mddev->major_version
2827 || !list_empty(&mddev->disks)) {
2829 "md: %s already running, cannot run %s\n",
2830 mdname(mddev), bdevname(rdev0->bdev,b));
2831 mddev_unlock(mddev);
2833 printk(KERN_INFO "md: created %s\n", mdname(mddev));
2834 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
2835 list_del_init(&rdev->same_set);
2836 if (bind_rdev_to_array(rdev, mddev))
2839 autorun_array(mddev);
2840 mddev_unlock(mddev);
2842 /* on success, candidates will be empty, on error
2845 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
2849 printk(KERN_INFO "md: ... autorun DONE.\n");
2853 * import RAID devices based on one partition
2854 * if possible, the array gets run as well.
2857 static int autostart_array(dev_t startdev)
2859 char b[BDEVNAME_SIZE];
2860 int err = -EINVAL, i;
2861 mdp_super_t *sb = NULL;
2862 mdk_rdev_t *start_rdev = NULL, *rdev;
2864 start_rdev = md_import_device(startdev, 0, 0);
2865 if (IS_ERR(start_rdev))
2869 /* NOTE: this can only work for 0.90.0 superblocks */
2870 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
2871 if (sb->major_version != 0 ||
2872 sb->minor_version != 90 ) {
2873 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
2874 export_rdev(start_rdev);
2878 if (test_bit(Faulty, &start_rdev->flags)) {
2880 "md: can not autostart based on faulty %s!\n",
2881 bdevname(start_rdev->bdev,b));
2882 export_rdev(start_rdev);
2885 list_add(&start_rdev->same_set, &pending_raid_disks);
2887 for (i = 0; i < MD_SB_DISKS; i++) {
2888 mdp_disk_t *desc = sb->disks + i;
2889 dev_t dev = MKDEV(desc->major, desc->minor);
2893 if (dev == startdev)
2895 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
2897 rdev = md_import_device(dev, 0, 0);
2901 list_add(&rdev->same_set, &pending_raid_disks);
2905 * possibly return codes
2913 static int get_version(void __user * arg)
2917 ver.major = MD_MAJOR_VERSION;
2918 ver.minor = MD_MINOR_VERSION;
2919 ver.patchlevel = MD_PATCHLEVEL_VERSION;
2921 if (copy_to_user(arg, &ver, sizeof(ver)))
2927 static int get_array_info(mddev_t * mddev, void __user * arg)
2929 mdu_array_info_t info;
2930 int nr,working,active,failed,spare;
2932 struct list_head *tmp;
2934 nr=working=active=failed=spare=0;
2935 ITERATE_RDEV(mddev,rdev,tmp) {
2937 if (test_bit(Faulty, &rdev->flags))
2941 if (test_bit(In_sync, &rdev->flags))
2948 info.major_version = mddev->major_version;
2949 info.minor_version = mddev->minor_version;
2950 info.patch_version = MD_PATCHLEVEL_VERSION;
2951 info.ctime = mddev->ctime;
2952 info.level = mddev->level;
2953 info.size = mddev->size;
2954 if (info.size != mddev->size) /* overflow */
2957 info.raid_disks = mddev->raid_disks;
2958 info.md_minor = mddev->md_minor;
2959 info.not_persistent= !mddev->persistent;
2961 info.utime = mddev->utime;
2964 info.state = (1<<MD_SB_CLEAN);
2965 if (mddev->bitmap && mddev->bitmap_offset)
2966 info.state = (1<<MD_SB_BITMAP_PRESENT);
2967 info.active_disks = active;
2968 info.working_disks = working;
2969 info.failed_disks = failed;
2970 info.spare_disks = spare;
2972 info.layout = mddev->layout;
2973 info.chunk_size = mddev->chunk_size;
2975 if (copy_to_user(arg, &info, sizeof(info)))
2981 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
2983 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
2984 char *ptr, *buf = NULL;
2987 file = kmalloc(sizeof(*file), GFP_KERNEL);
2991 /* bitmap disabled, zero the first byte and copy out */
2992 if (!mddev->bitmap || !mddev->bitmap->file) {
2993 file->pathname[0] = '\0';
2997 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3001 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3005 strcpy(file->pathname, ptr);
3009 if (copy_to_user(arg, file, sizeof(*file)))
3017 static int get_disk_info(mddev_t * mddev, void __user * arg)
3019 mdu_disk_info_t info;
3023 if (copy_from_user(&info, arg, sizeof(info)))
3028 rdev = find_rdev_nr(mddev, nr);
3030 info.major = MAJOR(rdev->bdev->bd_dev);
3031 info.minor = MINOR(rdev->bdev->bd_dev);
3032 info.raid_disk = rdev->raid_disk;
3034 if (test_bit(Faulty, &rdev->flags))
3035 info.state |= (1<<MD_DISK_FAULTY);
3036 else if (test_bit(In_sync, &rdev->flags)) {
3037 info.state |= (1<<MD_DISK_ACTIVE);
3038 info.state |= (1<<MD_DISK_SYNC);
3040 if (test_bit(WriteMostly, &rdev->flags))
3041 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3043 info.major = info.minor = 0;
3044 info.raid_disk = -1;
3045 info.state = (1<<MD_DISK_REMOVED);
3048 if (copy_to_user(arg, &info, sizeof(info)))
3054 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3056 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3058 dev_t dev = MKDEV(info->major,info->minor);
3060 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3063 if (!mddev->raid_disks) {
3065 /* expecting a device which has a superblock */
3066 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3069 "md: md_import_device returned %ld\n",
3071 return PTR_ERR(rdev);
3073 if (!list_empty(&mddev->disks)) {
3074 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3075 mdk_rdev_t, same_set);
3076 int err = super_types[mddev->major_version]
3077 .load_super(rdev, rdev0, mddev->minor_version);
3080 "md: %s has different UUID to %s\n",
3081 bdevname(rdev->bdev,b),
3082 bdevname(rdev0->bdev,b2));
3087 err = bind_rdev_to_array(rdev, mddev);
3094 * add_new_disk can be used once the array is assembled
3095 * to add "hot spares". They must already have a superblock
3100 if (!mddev->pers->hot_add_disk) {
3102 "%s: personality does not support diskops!\n",
3106 if (mddev->persistent)
3107 rdev = md_import_device(dev, mddev->major_version,
3108 mddev->minor_version);
3110 rdev = md_import_device(dev, -1, -1);
3113 "md: md_import_device returned %ld\n",
3115 return PTR_ERR(rdev);
3117 /* set save_raid_disk if appropriate */
3118 if (!mddev->persistent) {
3119 if (info->state & (1<<MD_DISK_SYNC) &&
3120 info->raid_disk < mddev->raid_disks)
3121 rdev->raid_disk = info->raid_disk;
3123 rdev->raid_disk = -1;
3125 super_types[mddev->major_version].
3126 validate_super(mddev, rdev);
3127 rdev->saved_raid_disk = rdev->raid_disk;
3129 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3130 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3131 set_bit(WriteMostly, &rdev->flags);
3133 rdev->raid_disk = -1;
3134 err = bind_rdev_to_array(rdev, mddev);
3138 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3139 md_wakeup_thread(mddev->thread);
3143 /* otherwise, add_new_disk is only allowed
3144 * for major_version==0 superblocks
3146 if (mddev->major_version != 0) {
3147 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3152 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3154 rdev = md_import_device (dev, -1, 0);
3157 "md: error, md_import_device() returned %ld\n",
3159 return PTR_ERR(rdev);
3161 rdev->desc_nr = info->number;
3162 if (info->raid_disk < mddev->raid_disks)
3163 rdev->raid_disk = info->raid_disk;
3165 rdev->raid_disk = -1;
3169 if (rdev->raid_disk < mddev->raid_disks)
3170 if (info->state & (1<<MD_DISK_SYNC))
3171 set_bit(In_sync, &rdev->flags);
3173 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3174 set_bit(WriteMostly, &rdev->flags);
3176 if (!mddev->persistent) {
3177 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3178 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3180 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3181 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3183 err = bind_rdev_to_array(rdev, mddev);
3193 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3195 char b[BDEVNAME_SIZE];
3201 rdev = find_rdev(mddev, dev);
3205 if (rdev->raid_disk >= 0)
3208 kick_rdev_from_array(rdev);
3209 md_update_sb(mddev);
3210 md_new_event(mddev);
3214 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3215 bdevname(rdev->bdev,b), mdname(mddev));
3219 static int hot_add_disk(mddev_t * mddev, dev_t dev)
3221 char b[BDEVNAME_SIZE];
3229 if (mddev->major_version != 0) {
3230 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3231 " version-0 superblocks.\n",
3235 if (!mddev->pers->hot_add_disk) {
3237 "%s: personality does not support diskops!\n",
3242 rdev = md_import_device (dev, -1, 0);
3245 "md: error, md_import_device() returned %ld\n",
3250 if (mddev->persistent)
3251 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3254 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3256 size = calc_dev_size(rdev, mddev->chunk_size);
3259 if (test_bit(Faulty, &rdev->flags)) {
3261 "md: can not hot-add faulty %s disk to %s!\n",
3262 bdevname(rdev->bdev,b), mdname(mddev));
3266 clear_bit(In_sync, &rdev->flags);
3268 err = bind_rdev_to_array(rdev, mddev);
3273 * The rest should better be atomic, we can have disk failures
3274 * noticed in interrupt contexts ...
3277 if (rdev->desc_nr == mddev->max_disks) {
3278 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3281 goto abort_unbind_export;
3284 rdev->raid_disk = -1;
3286 md_update_sb(mddev);
3289 * Kick recovery, maybe this spare has to be added to the
3290 * array immediately.
3292 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3293 md_wakeup_thread(mddev->thread);
3294 md_new_event(mddev);
3297 abort_unbind_export:
3298 unbind_rdev_from_array(rdev);
3305 /* similar to deny_write_access, but accounts for our holding a reference
3306 * to the file ourselves */
3307 static int deny_bitmap_write_access(struct file * file)
3309 struct inode *inode = file->f_mapping->host;
3311 spin_lock(&inode->i_lock);
3312 if (atomic_read(&inode->i_writecount) > 1) {
3313 spin_unlock(&inode->i_lock);
3316 atomic_set(&inode->i_writecount, -1);
3317 spin_unlock(&inode->i_lock);
3322 static int set_bitmap_file(mddev_t *mddev, int fd)
3327 if (!mddev->pers->quiesce)
3329 if (mddev->recovery || mddev->sync_thread)
3331 /* we should be able to change the bitmap.. */
3337 return -EEXIST; /* cannot add when bitmap is present */
3338 mddev->bitmap_file = fget(fd);
3340 if (mddev->bitmap_file == NULL) {
3341 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3346 err = deny_bitmap_write_access(mddev->bitmap_file);
3348 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3350 fput(mddev->bitmap_file);
3351 mddev->bitmap_file = NULL;
3354 mddev->bitmap_offset = 0; /* file overrides offset */
3355 } else if (mddev->bitmap == NULL)
3356 return -ENOENT; /* cannot remove what isn't there */
3359 mddev->pers->quiesce(mddev, 1);
3361 err = bitmap_create(mddev);
3363 bitmap_destroy(mddev);
3364 mddev->pers->quiesce(mddev, 0);
3365 } else if (fd < 0) {
3366 if (mddev->bitmap_file)
3367 fput(mddev->bitmap_file);
3368 mddev->bitmap_file = NULL;
3375 * set_array_info is used two different ways
3376 * The original usage is when creating a new array.
3377 * In this usage, raid_disks is > 0 and it together with
3378 * level, size, not_persistent,layout,chunksize determine the
3379 * shape of the array.
3380 * This will always create an array with a type-0.90.0 superblock.
3381 * The newer usage is when assembling an array.
3382 * In this case raid_disks will be 0, and the major_version field is
3383 * use to determine which style super-blocks are to be found on the devices.
3384 * The minor and patch _version numbers are also kept incase the
3385 * super_block handler wishes to interpret them.
3387 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3390 if (info->raid_disks == 0) {
3391 /* just setting version number for superblock loading */
3392 if (info->major_version < 0 ||
3393 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3394 super_types[info->major_version].name == NULL) {
3395 /* maybe try to auto-load a module? */
3397 "md: superblock version %d not known\n",
3398 info->major_version);
3401 mddev->major_version = info->major_version;
3402 mddev->minor_version = info->minor_version;
3403 mddev->patch_version = info->patch_version;
3406 mddev->major_version = MD_MAJOR_VERSION;
3407 mddev->minor_version = MD_MINOR_VERSION;
3408 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3409 mddev->ctime = get_seconds();
3411 mddev->level = info->level;
3412 mddev->clevel[0] = 0;
3413 mddev->size = info->size;
3414 mddev->raid_disks = info->raid_disks;
3415 /* don't set md_minor, it is determined by which /dev/md* was
3418 if (info->state & (1<<MD_SB_CLEAN))
3419 mddev->recovery_cp = MaxSector;
3421 mddev->recovery_cp = 0;
3422 mddev->persistent = ! info->not_persistent;
3424 mddev->layout = info->layout;
3425 mddev->chunk_size = info->chunk_size;
3427 mddev->max_disks = MD_SB_DISKS;
3429 mddev->sb_dirty = 1;
3431 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3432 mddev->bitmap_offset = 0;
3435 * Generate a 128 bit UUID
3437 get_random_bytes(mddev->uuid, 16);
3442 static int update_size(mddev_t *mddev, unsigned long size)
3446 struct list_head *tmp;
3448 if (mddev->pers->resize == NULL)
3450 /* The "size" is the amount of each device that is used.
3451 * This can only make sense for arrays with redundancy.
3452 * linear and raid0 always use whatever space is available
3453 * We can only consider changing the size if no resync
3454 * or reconstruction is happening, and if the new size
3455 * is acceptable. It must fit before the sb_offset or,
3456 * if that is <data_offset, it must fit before the
3457 * size of each device.
3458 * If size is zero, we find the largest size that fits.
3460 if (mddev->sync_thread)
3462 ITERATE_RDEV(mddev,rdev,tmp) {
3464 int fit = (size == 0);
3465 if (rdev->sb_offset > rdev->data_offset)
3466 avail = (rdev->sb_offset*2) - rdev->data_offset;
3468 avail = get_capacity(rdev->bdev->bd_disk)
3469 - rdev->data_offset;
3470 if (fit && (size == 0 || size > avail/2))
3472 if (avail < ((sector_t)size << 1))
3475 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3477 struct block_device *bdev;
3479 bdev = bdget_disk(mddev->gendisk, 0);
3481 mutex_lock(&bdev->bd_inode->i_mutex);
3482 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
3483 mutex_unlock(&bdev->bd_inode->i_mutex);
3490 static int update_raid_disks(mddev_t *mddev, int raid_disks)
3493 /* change the number of raid disks */
3494 if (mddev->pers->reshape == NULL)
3496 if (raid_disks <= 0 ||
3497 raid_disks >= mddev->max_disks)
3499 if (mddev->sync_thread)
3501 rv = mddev->pers->reshape(mddev, raid_disks);
3507 * update_array_info is used to change the configuration of an
3509 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3510 * fields in the info are checked against the array.
3511 * Any differences that cannot be handled will cause an error.
3512 * Normally, only one change can be managed at a time.
3514 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3520 /* calculate expected state,ignoring low bits */
3521 if (mddev->bitmap && mddev->bitmap_offset)
3522 state |= (1 << MD_SB_BITMAP_PRESENT);
3524 if (mddev->major_version != info->major_version ||
3525 mddev->minor_version != info->minor_version ||
3526 /* mddev->patch_version != info->patch_version || */
3527 mddev->ctime != info->ctime ||
3528 mddev->level != info->level ||
3529 /* mddev->layout != info->layout || */
3530 !mddev->persistent != info->not_persistent||
3531 mddev->chunk_size != info->chunk_size ||
3532 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3533 ((state^info->state) & 0xfffffe00)
3536 /* Check there is only one change */
3537 if (info->size >= 0 && mddev->size != info->size) cnt++;
3538 if (mddev->raid_disks != info->raid_disks) cnt++;
3539 if (mddev->layout != info->layout) cnt++;
3540 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
3541 if (cnt == 0) return 0;
3542 if (cnt > 1) return -EINVAL;
3544 if (mddev->layout != info->layout) {
3546 * we don't need to do anything at the md level, the
3547 * personality will take care of it all.
3549 if (mddev->pers->reconfig == NULL)
3552 return mddev->pers->reconfig(mddev, info->layout, -1);
3554 if (info->size >= 0 && mddev->size != info->size)
3555 rv = update_size(mddev, info->size);
3557 if (mddev->raid_disks != info->raid_disks)
3558 rv = update_raid_disks(mddev, info->raid_disks);
3560 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3561 if (mddev->pers->quiesce == NULL)
3563 if (mddev->recovery || mddev->sync_thread)
3565 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3566 /* add the bitmap */
3569 if (mddev->default_bitmap_offset == 0)
3571 mddev->bitmap_offset = mddev->default_bitmap_offset;
3572 mddev->pers->quiesce(mddev, 1);
3573 rv = bitmap_create(mddev);
3575 bitmap_destroy(mddev);
3576 mddev->pers->quiesce(mddev, 0);
3578 /* remove the bitmap */
3581 if (mddev->bitmap->file)
3583 mddev->pers->quiesce(mddev, 1);
3584 bitmap_destroy(mddev);
3585 mddev->pers->quiesce(mddev, 0);
3586 mddev->bitmap_offset = 0;
3589 md_update_sb(mddev);
3593 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3597 if (mddev->pers == NULL)
3600 rdev = find_rdev(mddev, dev);
3604 md_error(mddev, rdev);
3608 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3610 mddev_t *mddev = bdev->bd_disk->private_data;
3614 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3618 static int md_ioctl(struct inode *inode, struct file *file,
3619 unsigned int cmd, unsigned long arg)
3622 void __user *argp = (void __user *)arg;
3623 mddev_t *mddev = NULL;
3625 if (!capable(CAP_SYS_ADMIN))
3629 * Commands dealing with the RAID driver but not any
3635 err = get_version(argp);
3638 case PRINT_RAID_DEBUG:
3646 autostart_arrays(arg);
3653 * Commands creating/starting a new array:
3656 mddev = inode->i_bdev->bd_disk->private_data;
3664 if (cmd == START_ARRAY) {
3665 /* START_ARRAY doesn't need to lock the array as autostart_array
3666 * does the locking, and it could even be a different array
3671 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3672 "This will not be supported beyond July 2006\n",
3673 current->comm, current->pid);
3676 err = autostart_array(new_decode_dev(arg));
3678 printk(KERN_WARNING "md: autostart failed!\n");
3684 err = mddev_lock(mddev);
3687 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3694 case SET_ARRAY_INFO:
3696 mdu_array_info_t info;
3698 memset(&info, 0, sizeof(info));
3699 else if (copy_from_user(&info, argp, sizeof(info))) {
3704 err = update_array_info(mddev, &info);
3706 printk(KERN_WARNING "md: couldn't update"
3707 " array info. %d\n", err);
3712 if (!list_empty(&mddev->disks)) {
3714 "md: array %s already has disks!\n",
3719 if (mddev->raid_disks) {
3721 "md: array %s already initialised!\n",
3726 err = set_array_info(mddev, &info);
3728 printk(KERN_WARNING "md: couldn't set"
3729 " array info. %d\n", err);
3739 * Commands querying/configuring an existing array:
3741 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
3742 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
3743 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
3744 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
3750 * Commands even a read-only array can execute:
3754 case GET_ARRAY_INFO:
3755 err = get_array_info(mddev, argp);
3758 case GET_BITMAP_FILE:
3759 err = get_bitmap_file(mddev, argp);
3763 err = get_disk_info(mddev, argp);
3766 case RESTART_ARRAY_RW:
3767 err = restart_array(mddev);
3771 err = do_md_stop (mddev, 0);
3775 err = do_md_stop (mddev, 1);
3779 * We have a problem here : there is no easy way to give a CHS
3780 * virtual geometry. We currently pretend that we have a 2 heads
3781 * 4 sectors (with a BIG number of cylinders...). This drives
3782 * dosfs just mad... ;-)
3787 * The remaining ioctls are changing the state of the
3788 * superblock, so we do not allow them on read-only arrays.
3789 * However non-MD ioctls (e.g. get-size) will still come through
3790 * here and hit the 'default' below, so only disallow
3791 * 'md' ioctls, and switch to rw mode if started auto-readonly.
3793 if (_IOC_TYPE(cmd) == MD_MAJOR &&
3794 mddev->ro && mddev->pers) {
3795 if (mddev->ro == 2) {
3797 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3798 md_wakeup_thread(mddev->thread);
3810 mdu_disk_info_t info;
3811 if (copy_from_user(&info, argp, sizeof(info)))
3814 err = add_new_disk(mddev, &info);
3818 case HOT_REMOVE_DISK:
3819 err = hot_remove_disk(mddev, new_decode_dev(arg));
3823 err = hot_add_disk(mddev, new_decode_dev(arg));
3826 case SET_DISK_FAULTY:
3827 err = set_disk_faulty(mddev, new_decode_dev(arg));
3831 err = do_md_run (mddev);
3834 case SET_BITMAP_FILE:
3835 err = set_bitmap_file(mddev, (int)arg);
3839 if (_IOC_TYPE(cmd) == MD_MAJOR)
3840 printk(KERN_WARNING "md: %s(pid %d) used"
3841 " obsolete MD ioctl, upgrade your"
3842 " software to use new ictls.\n",
3843 current->comm, current->pid);
3850 mddev_unlock(mddev);
3860 static int md_open(struct inode *inode, struct file *file)
3863 * Succeed if we can lock the mddev, which confirms that
3864 * it isn't being stopped right now.
3866 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3869 if ((err = mddev_lock(mddev)))
3874 mddev_unlock(mddev);
3876 check_disk_change(inode->i_bdev);
3881 static int md_release(struct inode *inode, struct file * file)
3883 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
3892 static int md_media_changed(struct gendisk *disk)
3894 mddev_t *mddev = disk->private_data;
3896 return mddev->changed;
3899 static int md_revalidate(struct gendisk *disk)
3901 mddev_t *mddev = disk->private_data;
3906 static struct block_device_operations md_fops =
3908 .owner = THIS_MODULE,
3910 .release = md_release,
3912 .getgeo = md_getgeo,
3913 .media_changed = md_media_changed,
3914 .revalidate_disk= md_revalidate,
3917 static int md_thread(void * arg)
3919 mdk_thread_t *thread = arg;
3922 * md_thread is a 'system-thread', it's priority should be very
3923 * high. We avoid resource deadlocks individually in each
3924 * raid personality. (RAID5 does preallocation) We also use RR and
3925 * the very same RT priority as kswapd, thus we will never get
3926 * into a priority inversion deadlock.
3928 * we definitely have to have equal or higher priority than
3929 * bdflush, otherwise bdflush will deadlock if there are too
3930 * many dirty RAID5 blocks.
3933 allow_signal(SIGKILL);
3934 while (!kthread_should_stop()) {
3936 /* We need to wait INTERRUPTIBLE so that
3937 * we don't add to the load-average.
3938 * That means we need to be sure no signals are
3941 if (signal_pending(current))
3942 flush_signals(current);
3944 wait_event_interruptible_timeout
3946 test_bit(THREAD_WAKEUP, &thread->flags)
3947 || kthread_should_stop(),
3951 clear_bit(THREAD_WAKEUP, &thread->flags);
3953 thread->run(thread->mddev);
3959 void md_wakeup_thread(mdk_thread_t *thread)
3962 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
3963 set_bit(THREAD_WAKEUP, &thread->flags);
3964 wake_up(&thread->wqueue);
3968 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
3971 mdk_thread_t *thread;
3973 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
3977 init_waitqueue_head(&thread->wqueue);
3980 thread->mddev = mddev;
3981 thread->timeout = MAX_SCHEDULE_TIMEOUT;
3982 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
3983 if (IS_ERR(thread->tsk)) {
3990 void md_unregister_thread(mdk_thread_t *thread)
3992 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
3994 kthread_stop(thread->tsk);
3998 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4005 if (!rdev || test_bit(Faulty, &rdev->flags))
4008 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4010 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4011 __builtin_return_address(0),__builtin_return_address(1),
4012 __builtin_return_address(2),__builtin_return_address(3));
4014 if (!mddev->pers->error_handler)
4016 mddev->pers->error_handler(mddev,rdev);
4017 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4018 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4019 md_wakeup_thread(mddev->thread);
4020 md_new_event(mddev);
4023 /* seq_file implementation /proc/mdstat */
4025 static void status_unused(struct seq_file *seq)
4029 struct list_head *tmp;
4031 seq_printf(seq, "unused devices: ");
4033 ITERATE_RDEV_PENDING(rdev,tmp) {
4034 char b[BDEVNAME_SIZE];
4036 seq_printf(seq, "%s ",
4037 bdevname(rdev->bdev,b));
4040 seq_printf(seq, "<none>");
4042 seq_printf(seq, "\n");
4046 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4048 unsigned long max_blocks, resync, res, dt, db, rt;
4050 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4052 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4053 max_blocks = mddev->resync_max_sectors >> 1;
4055 max_blocks = mddev->size;
4058 * Should not happen.
4064 res = (resync/1024)*1000/(max_blocks/1024 + 1);
4066 int i, x = res/50, y = 20-x;
4067 seq_printf(seq, "[");
4068 for (i = 0; i < x; i++)
4069 seq_printf(seq, "=");
4070 seq_printf(seq, ">");
4071 for (i = 0; i < y; i++)
4072 seq_printf(seq, ".");
4073 seq_printf(seq, "] ");
4075 seq_printf(seq, " %s =%3lu.%lu%% (%lu/%lu)",
4076 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4077 "resync" : "recovery"),
4078 res/10, res % 10, resync, max_blocks);
4081 * We do not want to overflow, so the order of operands and
4082 * the * 100 / 100 trick are important. We do a +1 to be
4083 * safe against division by zero. We only estimate anyway.
4085 * dt: time from mark until now
4086 * db: blocks written from mark until now
4087 * rt: remaining time
4089 dt = ((jiffies - mddev->resync_mark) / HZ);
4091 db = resync - (mddev->resync_mark_cnt/2);
4092 rt = (dt * ((max_blocks-resync) / (db/100+1)))/100;
4094 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4096 seq_printf(seq, " speed=%ldK/sec", db/dt);
4099 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4101 struct list_head *tmp;
4111 spin_lock(&all_mddevs_lock);
4112 list_for_each(tmp,&all_mddevs)
4114 mddev = list_entry(tmp, mddev_t, all_mddevs);
4116 spin_unlock(&all_mddevs_lock);
4119 spin_unlock(&all_mddevs_lock);
4121 return (void*)2;/* tail */
4125 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4127 struct list_head *tmp;
4128 mddev_t *next_mddev, *mddev = v;
4134 spin_lock(&all_mddevs_lock);
4136 tmp = all_mddevs.next;
4138 tmp = mddev->all_mddevs.next;
4139 if (tmp != &all_mddevs)
4140 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4142 next_mddev = (void*)2;
4145 spin_unlock(&all_mddevs_lock);
4153 static void md_seq_stop(struct seq_file *seq, void *v)
4157 if (mddev && v != (void*)1 && v != (void*)2)
4161 struct mdstat_info {
4165 static int md_seq_show(struct seq_file *seq, void *v)
4169 struct list_head *tmp2;
4171 struct mdstat_info *mi = seq->private;
4172 struct bitmap *bitmap;
4174 if (v == (void*)1) {
4175 struct mdk_personality *pers;
4176 seq_printf(seq, "Personalities : ");
4177 spin_lock(&pers_lock);
4178 list_for_each_entry(pers, &pers_list, list)
4179 seq_printf(seq, "[%s] ", pers->name);
4181 spin_unlock(&pers_lock);
4182 seq_printf(seq, "\n");
4183 mi->event = atomic_read(&md_event_count);
4186 if (v == (void*)2) {
4191 if (mddev_lock(mddev)!=0)
4193 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4194 seq_printf(seq, "%s : %sactive", mdname(mddev),
4195 mddev->pers ? "" : "in");
4198 seq_printf(seq, " (read-only)");
4200 seq_printf(seq, "(auto-read-only)");
4201 seq_printf(seq, " %s", mddev->pers->name);
4205 ITERATE_RDEV(mddev,rdev,tmp2) {
4206 char b[BDEVNAME_SIZE];
4207 seq_printf(seq, " %s[%d]",
4208 bdevname(rdev->bdev,b), rdev->desc_nr);
4209 if (test_bit(WriteMostly, &rdev->flags))
4210 seq_printf(seq, "(W)");
4211 if (test_bit(Faulty, &rdev->flags)) {
4212 seq_printf(seq, "(F)");
4214 } else if (rdev->raid_disk < 0)
4215 seq_printf(seq, "(S)"); /* spare */
4219 if (!list_empty(&mddev->disks)) {
4221 seq_printf(seq, "\n %llu blocks",
4222 (unsigned long long)mddev->array_size);
4224 seq_printf(seq, "\n %llu blocks",
4225 (unsigned long long)size);
4227 if (mddev->persistent) {
4228 if (mddev->major_version != 0 ||
4229 mddev->minor_version != 90) {
4230 seq_printf(seq," super %d.%d",
4231 mddev->major_version,
4232 mddev->minor_version);
4235 seq_printf(seq, " super non-persistent");
4238 mddev->pers->status (seq, mddev);
4239 seq_printf(seq, "\n ");
4240 if (mddev->pers->sync_request) {
4241 if (mddev->curr_resync > 2) {
4242 status_resync (seq, mddev);
4243 seq_printf(seq, "\n ");
4244 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4245 seq_printf(seq, "\tresync=DELAYED\n ");
4246 else if (mddev->recovery_cp < MaxSector)
4247 seq_printf(seq, "\tresync=PENDING\n ");
4250 seq_printf(seq, "\n ");
4252 if ((bitmap = mddev->bitmap)) {
4253 unsigned long chunk_kb;
4254 unsigned long flags;
4255 spin_lock_irqsave(&bitmap->lock, flags);
4256 chunk_kb = bitmap->chunksize >> 10;
4257 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4259 bitmap->pages - bitmap->missing_pages,
4261 (bitmap->pages - bitmap->missing_pages)
4262 << (PAGE_SHIFT - 10),
4263 chunk_kb ? chunk_kb : bitmap->chunksize,
4264 chunk_kb ? "KB" : "B");
4266 seq_printf(seq, ", file: ");
4267 seq_path(seq, bitmap->file->f_vfsmnt,
4268 bitmap->file->f_dentry," \t\n");
4271 seq_printf(seq, "\n");
4272 spin_unlock_irqrestore(&bitmap->lock, flags);
4275 seq_printf(seq, "\n");
4277 mddev_unlock(mddev);
4282 static struct seq_operations md_seq_ops = {
4283 .start = md_seq_start,
4284 .next = md_seq_next,
4285 .stop = md_seq_stop,
4286 .show = md_seq_show,
4289 static int md_seq_open(struct inode *inode, struct file *file)
4292 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4296 error = seq_open(file, &md_seq_ops);
4300 struct seq_file *p = file->private_data;
4302 mi->event = atomic_read(&md_event_count);
4307 static int md_seq_release(struct inode *inode, struct file *file)
4309 struct seq_file *m = file->private_data;
4310 struct mdstat_info *mi = m->private;
4313 return seq_release(inode, file);
4316 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4318 struct seq_file *m = filp->private_data;
4319 struct mdstat_info *mi = m->private;
4322 poll_wait(filp, &md_event_waiters, wait);
4324 /* always allow read */
4325 mask = POLLIN | POLLRDNORM;
4327 if (mi->event != atomic_read(&md_event_count))
4328 mask |= POLLERR | POLLPRI;
4332 static struct file_operations md_seq_fops = {
4333 .open = md_seq_open,
4335 .llseek = seq_lseek,
4336 .release = md_seq_release,
4337 .poll = mdstat_poll,
4340 int register_md_personality(struct mdk_personality *p)
4342 spin_lock(&pers_lock);
4343 list_add_tail(&p->list, &pers_list);
4344 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
4345 spin_unlock(&pers_lock);
4349 int unregister_md_personality(struct mdk_personality *p)
4351 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
4352 spin_lock(&pers_lock);
4353 list_del_init(&p->list);
4354 spin_unlock(&pers_lock);
4358 static int is_mddev_idle(mddev_t *mddev)
4361 struct list_head *tmp;
4363 unsigned long curr_events;
4366 ITERATE_RDEV(mddev,rdev,tmp) {
4367 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
4368 curr_events = disk_stat_read(disk, sectors[0]) +
4369 disk_stat_read(disk, sectors[1]) -
4370 atomic_read(&disk->sync_io);
4371 /* The difference between curr_events and last_events
4372 * will be affected by any new non-sync IO (making
4373 * curr_events bigger) and any difference in the amount of
4374 * in-flight syncio (making current_events bigger or smaller)
4375 * The amount in-flight is currently limited to
4376 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4377 * which is at most 4096 sectors.
4378 * These numbers are fairly fragile and should be made
4379 * more robust, probably by enforcing the
4380 * 'window size' that md_do_sync sort-of uses.
4382 * Note: the following is an unsigned comparison.
4384 if ((curr_events - rdev->last_events + 4096) > 8192) {
4385 rdev->last_events = curr_events;
4392 void md_done_sync(mddev_t *mddev, int blocks, int ok)
4394 /* another "blocks" (512byte) blocks have been synced */
4395 atomic_sub(blocks, &mddev->recovery_active);
4396 wake_up(&mddev->recovery_wait);
4398 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4399 md_wakeup_thread(mddev->thread);
4400 // stop recovery, signal do_sync ....
4405 /* md_write_start(mddev, bi)
4406 * If we need to update some array metadata (e.g. 'active' flag
4407 * in superblock) before writing, schedule a superblock update
4408 * and wait for it to complete.
4410 void md_write_start(mddev_t *mddev, struct bio *bi)
4412 if (bio_data_dir(bi) != WRITE)
4415 BUG_ON(mddev->ro == 1);
4416 if (mddev->ro == 2) {
4417 /* need to switch to read/write */
4419 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4420 md_wakeup_thread(mddev->thread);
4422 atomic_inc(&mddev->writes_pending);
4423 if (mddev->in_sync) {
4424 spin_lock_irq(&mddev->write_lock);
4425 if (mddev->in_sync) {
4427 mddev->sb_dirty = 1;
4428 md_wakeup_thread(mddev->thread);
4430 spin_unlock_irq(&mddev->write_lock);
4432 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
4435 void md_write_end(mddev_t *mddev)
4437 if (atomic_dec_and_test(&mddev->writes_pending)) {
4438 if (mddev->safemode == 2)
4439 md_wakeup_thread(mddev->thread);
4441 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4445 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
4447 #define SYNC_MARKS 10
4448 #define SYNC_MARK_STEP (3*HZ)
4449 static void md_do_sync(mddev_t *mddev)
4452 unsigned int currspeed = 0,
4454 sector_t max_sectors,j, io_sectors;
4455 unsigned long mark[SYNC_MARKS];
4456 sector_t mark_cnt[SYNC_MARKS];
4458 struct list_head *tmp;
4459 sector_t last_check;
4462 /* just incase thread restarts... */
4463 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4466 /* we overload curr_resync somewhat here.
4467 * 0 == not engaged in resync at all
4468 * 2 == checking that there is no conflict with another sync
4469 * 1 == like 2, but have yielded to allow conflicting resync to
4471 * other == active in resync - this many blocks
4473 * Before starting a resync we must have set curr_resync to
4474 * 2, and then checked that every "conflicting" array has curr_resync
4475 * less than ours. When we find one that is the same or higher
4476 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4477 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4478 * This will mean we have to start checking from the beginning again.
4483 mddev->curr_resync = 2;
4486 if (kthread_should_stop()) {
4487 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4490 ITERATE_MDDEV(mddev2,tmp) {
4491 if (mddev2 == mddev)
4493 if (mddev2->curr_resync &&
4494 match_mddev_units(mddev,mddev2)) {
4496 if (mddev < mddev2 && mddev->curr_resync == 2) {
4497 /* arbitrarily yield */
4498 mddev->curr_resync = 1;
4499 wake_up(&resync_wait);
4501 if (mddev > mddev2 && mddev->curr_resync == 1)
4502 /* no need to wait here, we can wait the next
4503 * time 'round when curr_resync == 2
4506 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4507 if (!kthread_should_stop() &&
4508 mddev2->curr_resync >= mddev->curr_resync) {
4509 printk(KERN_INFO "md: delaying resync of %s"
4510 " until %s has finished resync (they"
4511 " share one or more physical units)\n",
4512 mdname(mddev), mdname(mddev2));
4515 finish_wait(&resync_wait, &wq);
4518 finish_wait(&resync_wait, &wq);
4521 } while (mddev->curr_resync < 2);
4523 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4524 /* resync follows the size requested by the personality,
4525 * which defaults to physical size, but can be virtual size
4527 max_sectors = mddev->resync_max_sectors;
4528 mddev->resync_mismatches = 0;
4530 /* recovery follows the physical size of devices */
4531 max_sectors = mddev->size << 1;
4533 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4534 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4535 " %d KB/sec/disc.\n", speed_min(mddev));
4536 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
4537 "(but not more than %d KB/sec) for reconstruction.\n",
4540 is_mddev_idle(mddev); /* this also initializes IO event counters */
4541 /* we don't use the checkpoint if there's a bitmap */
4542 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) && !mddev->bitmap
4543 && ! test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4544 j = mddev->recovery_cp;
4548 for (m = 0; m < SYNC_MARKS; m++) {
4550 mark_cnt[m] = io_sectors;
4553 mddev->resync_mark = mark[last_mark];
4554 mddev->resync_mark_cnt = mark_cnt[last_mark];
4557 * Tune reconstruction:
4559 window = 32*(PAGE_SIZE/512);
4560 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4561 window/2,(unsigned long long) max_sectors/2);
4563 atomic_set(&mddev->recovery_active, 0);
4564 init_waitqueue_head(&mddev->recovery_wait);
4569 "md: resuming recovery of %s from checkpoint.\n",
4571 mddev->curr_resync = j;
4574 while (j < max_sectors) {
4578 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4579 currspeed < speed_min(mddev));
4581 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4585 if (!skipped) { /* actual IO requested */
4586 io_sectors += sectors;
4587 atomic_add(sectors, &mddev->recovery_active);
4591 if (j>1) mddev->curr_resync = j;
4592 if (last_check == 0)
4593 /* this is the earliers that rebuilt will be
4594 * visible in /proc/mdstat
4596 md_new_event(mddev);
4598 if (last_check + window > io_sectors || j == max_sectors)
4601 last_check = io_sectors;
4603 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4604 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4608 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4610 int next = (last_mark+1) % SYNC_MARKS;
4612 mddev->resync_mark = mark[next];
4613 mddev->resync_mark_cnt = mark_cnt[next];
4614 mark[next] = jiffies;
4615 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
4620 if (kthread_should_stop()) {
4622 * got a signal, exit.
4625 "md: md_do_sync() got signal ... exiting\n");
4626 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4631 * this loop exits only if either when we are slower than
4632 * the 'hard' speed limit, or the system was IO-idle for
4634 * the system might be non-idle CPU-wise, but we only care
4635 * about not overloading the IO subsystem. (things like an
4636 * e2fsck being done on the RAID array should execute fast)
4638 mddev->queue->unplug_fn(mddev->queue);
4641 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4642 /((jiffies-mddev->resync_mark)/HZ +1) +1;
4644 if (currspeed > speed_min(mddev)) {
4645 if ((currspeed > speed_max(mddev)) ||
4646 !is_mddev_idle(mddev)) {
4652 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4654 * this also signals 'finished resyncing' to md_stop
4657 mddev->queue->unplug_fn(mddev->queue);
4659 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4661 /* tell personality that we are finished */
4662 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
4664 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4665 mddev->curr_resync > 2 &&
4666 mddev->curr_resync >= mddev->recovery_cp) {
4667 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4669 "md: checkpointing recovery of %s.\n",
4671 mddev->recovery_cp = mddev->curr_resync;
4673 mddev->recovery_cp = MaxSector;
4677 mddev->curr_resync = 0;
4678 wake_up(&resync_wait);
4679 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4680 md_wakeup_thread(mddev->thread);
4685 * This routine is regularly called by all per-raid-array threads to
4686 * deal with generic issues like resync and super-block update.
4687 * Raid personalities that don't have a thread (linear/raid0) do not
4688 * need this as they never do any recovery or update the superblock.
4690 * It does not do any resync itself, but rather "forks" off other threads
4691 * to do that as needed.
4692 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
4693 * "->recovery" and create a thread at ->sync_thread.
4694 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
4695 * and wakeups up this thread which will reap the thread and finish up.
4696 * This thread also removes any faulty devices (with nr_pending == 0).
4698 * The overall approach is:
4699 * 1/ if the superblock needs updating, update it.
4700 * 2/ If a recovery thread is running, don't do anything else.
4701 * 3/ If recovery has finished, clean up, possibly marking spares active.
4702 * 4/ If there are any faulty devices, remove them.
4703 * 5/ If array is degraded, try to add spares devices
4704 * 6/ If array has spares or is not in-sync, start a resync thread.
4706 void md_check_recovery(mddev_t *mddev)
4709 struct list_head *rtmp;
4713 bitmap_daemon_work(mddev->bitmap);
4718 if (signal_pending(current)) {
4719 if (mddev->pers->sync_request) {
4720 printk(KERN_INFO "md: %s in immediate safe mode\n",
4722 mddev->safemode = 2;
4724 flush_signals(current);
4729 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
4730 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
4731 (mddev->safemode == 1) ||
4732 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
4733 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
4737 if (mddev_trylock(mddev)==0) {
4740 spin_lock_irq(&mddev->write_lock);
4741 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
4742 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
4744 mddev->sb_dirty = 1;
4746 if (mddev->safemode == 1)
4747 mddev->safemode = 0;
4748 spin_unlock_irq(&mddev->write_lock);
4750 if (mddev->sb_dirty)
4751 md_update_sb(mddev);
4754 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
4755 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
4756 /* resync/recovery still happening */
4757 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4760 if (mddev->sync_thread) {
4761 /* resync has finished, collect result */
4762 md_unregister_thread(mddev->sync_thread);
4763 mddev->sync_thread = NULL;
4764 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4765 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4767 /* activate any spares */
4768 mddev->pers->spare_active(mddev);
4770 md_update_sb(mddev);
4772 /* if array is no-longer degraded, then any saved_raid_disk
4773 * information must be scrapped
4775 if (!mddev->degraded)
4776 ITERATE_RDEV(mddev,rdev,rtmp)
4777 rdev->saved_raid_disk = -1;
4779 mddev->recovery = 0;
4780 /* flag recovery needed just to double check */
4781 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4782 md_new_event(mddev);
4785 /* Clear some bits that don't mean anything, but
4788 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4789 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
4790 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
4791 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
4793 /* no recovery is running.
4794 * remove any failed drives, then
4795 * add spares if possible.
4796 * Spare are also removed and re-added, to allow
4797 * the personality to fail the re-add.
4799 ITERATE_RDEV(mddev,rdev,rtmp)
4800 if (rdev->raid_disk >= 0 &&
4801 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
4802 atomic_read(&rdev->nr_pending)==0) {
4803 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
4805 sprintf(nm,"rd%d", rdev->raid_disk);
4806 sysfs_remove_link(&mddev->kobj, nm);
4807 rdev->raid_disk = -1;
4811 if (mddev->degraded) {
4812 ITERATE_RDEV(mddev,rdev,rtmp)
4813 if (rdev->raid_disk < 0
4814 && !test_bit(Faulty, &rdev->flags)) {
4815 if (mddev->pers->hot_add_disk(mddev,rdev)) {
4817 sprintf(nm, "rd%d", rdev->raid_disk);
4818 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
4820 md_new_event(mddev);
4827 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4828 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
4829 } else if (mddev->recovery_cp < MaxSector) {
4830 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
4831 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4832 /* nothing to be done ... */
4835 if (mddev->pers->sync_request) {
4836 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
4837 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
4838 /* We are adding a device or devices to an array
4839 * which has the bitmap stored on all devices.
4840 * So make sure all bitmap pages get written
4842 bitmap_write_all(mddev->bitmap);
4844 mddev->sync_thread = md_register_thread(md_do_sync,
4847 if (!mddev->sync_thread) {
4848 printk(KERN_ERR "%s: could not start resync"
4851 /* leave the spares where they are, it shouldn't hurt */
4852 mddev->recovery = 0;
4854 md_wakeup_thread(mddev->sync_thread);
4855 md_new_event(mddev);
4858 mddev_unlock(mddev);
4862 static int md_notify_reboot(struct notifier_block *this,
4863 unsigned long code, void *x)
4865 struct list_head *tmp;
4868 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
4870 printk(KERN_INFO "md: stopping all md devices.\n");
4872 ITERATE_MDDEV(mddev,tmp)
4873 if (mddev_trylock(mddev)==0)
4874 do_md_stop (mddev, 1);
4876 * certain more exotic SCSI devices are known to be
4877 * volatile wrt too early system reboots. While the
4878 * right place to handle this issue is the given
4879 * driver, we do want to have a safe RAID driver ...
4886 static struct notifier_block md_notifier = {
4887 .notifier_call = md_notify_reboot,
4889 .priority = INT_MAX, /* before any real devices */
4892 static void md_geninit(void)
4894 struct proc_dir_entry *p;
4896 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
4898 p = create_proc_entry("mdstat", S_IRUGO, NULL);
4900 p->proc_fops = &md_seq_fops;
4903 static int __init md_init(void)
4907 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
4908 " MD_SB_DISKS=%d\n",
4909 MD_MAJOR_VERSION, MD_MINOR_VERSION,
4910 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
4911 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
4914 if (register_blkdev(MAJOR_NR, "md"))
4916 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
4917 unregister_blkdev(MAJOR_NR, "md");
4921 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
4922 md_probe, NULL, NULL);
4923 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
4924 md_probe, NULL, NULL);
4926 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4927 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
4928 S_IFBLK|S_IRUSR|S_IWUSR,
4931 for (minor=0; minor < MAX_MD_DEVS; ++minor)
4932 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
4933 S_IFBLK|S_IRUSR|S_IWUSR,
4937 register_reboot_notifier(&md_notifier);
4938 raid_table_header = register_sysctl_table(raid_root_table, 1);
4948 * Searches all registered partitions for autorun RAID arrays
4951 static dev_t detected_devices[128];
4954 void md_autodetect_dev(dev_t dev)
4956 if (dev_cnt >= 0 && dev_cnt < 127)
4957 detected_devices[dev_cnt++] = dev;
4961 static void autostart_arrays(int part)
4966 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
4968 for (i = 0; i < dev_cnt; i++) {
4969 dev_t dev = detected_devices[i];
4971 rdev = md_import_device(dev,0, 0);
4975 if (test_bit(Faulty, &rdev->flags)) {
4979 list_add(&rdev->same_set, &pending_raid_disks);
4983 autorun_devices(part);
4988 static __exit void md_exit(void)
4991 struct list_head *tmp;
4993 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
4994 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
4995 for (i=0; i < MAX_MD_DEVS; i++)
4996 devfs_remove("md/%d", i);
4997 for (i=0; i < MAX_MD_DEVS; i++)
4998 devfs_remove("md/d%d", i);
5002 unregister_blkdev(MAJOR_NR,"md");
5003 unregister_blkdev(mdp_major, "mdp");
5004 unregister_reboot_notifier(&md_notifier);
5005 unregister_sysctl_table(raid_table_header);
5006 remove_proc_entry("mdstat", NULL);
5007 ITERATE_MDDEV(mddev,tmp) {
5008 struct gendisk *disk = mddev->gendisk;
5011 export_array(mddev);
5014 mddev->gendisk = NULL;
5019 module_init(md_init)
5020 module_exit(md_exit)
5022 static int get_ro(char *buffer, struct kernel_param *kp)
5024 return sprintf(buffer, "%d", start_readonly);
5026 static int set_ro(const char *val, struct kernel_param *kp)
5029 int num = simple_strtoul(val, &e, 10);
5030 if (*val && (*e == '\0' || *e == '\n')) {
5031 start_readonly = num;
5037 module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
5038 module_param(start_dirty_degraded, int, 0644);
5041 EXPORT_SYMBOL(register_md_personality);
5042 EXPORT_SYMBOL(unregister_md_personality);
5043 EXPORT_SYMBOL(md_error);
5044 EXPORT_SYMBOL(md_done_sync);
5045 EXPORT_SYMBOL(md_write_start);
5046 EXPORT_SYMBOL(md_write_end);
5047 EXPORT_SYMBOL(md_register_thread);
5048 EXPORT_SYMBOL(md_unregister_thread);
5049 EXPORT_SYMBOL(md_wakeup_thread);
5050 EXPORT_SYMBOL(md_print_devices);
5051 EXPORT_SYMBOL(md_check_recovery);
5052 MODULE_LICENSE("GPL");
5054 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);