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>
46 #include <linux/mutex.h>
47 #include <linux/ctype.h>
49 #include <linux/init.h>
51 #include <linux/file.h>
54 #include <linux/kmod.h>
57 #include <asm/unaligned.h>
59 #define MAJOR_NR MD_MAJOR
62 /* 63 partitions with the alternate major number (mdp) */
63 #define MdpMinorShift 6
66 #define dprintk(x...) ((void)(DEBUG && printk(x)))
70 static void autostart_arrays (int part);
73 static LIST_HEAD(pers_list);
74 static DEFINE_SPINLOCK(pers_lock);
76 static void md_print_devices(void);
78 #define MD_BUG(x...) { printk("md: bug in file %s, line %d\n", __FILE__, __LINE__); md_print_devices(); }
81 * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
82 * is 1000 KB/sec, so the extra system load does not show up that much.
83 * Increase it if you want to have more _guaranteed_ speed. Note that
84 * the RAID driver will use the maximum available bandwidth if the IO
85 * subsystem is idle. There is also an 'absolute maximum' reconstruction
86 * speed limit - in case reconstruction slows down your system despite
89 * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
90 * or /sys/block/mdX/md/sync_speed_{min,max}
93 static int sysctl_speed_limit_min = 1000;
94 static int sysctl_speed_limit_max = 200000;
95 static inline int speed_min(mddev_t *mddev)
97 return mddev->sync_speed_min ?
98 mddev->sync_speed_min : sysctl_speed_limit_min;
101 static inline int speed_max(mddev_t *mddev)
103 return mddev->sync_speed_max ?
104 mddev->sync_speed_max : sysctl_speed_limit_max;
107 static struct ctl_table_header *raid_table_header;
109 static ctl_table raid_table[] = {
111 .ctl_name = DEV_RAID_SPEED_LIMIT_MIN,
112 .procname = "speed_limit_min",
113 .data = &sysctl_speed_limit_min,
114 .maxlen = sizeof(int),
116 .proc_handler = &proc_dointvec,
119 .ctl_name = DEV_RAID_SPEED_LIMIT_MAX,
120 .procname = "speed_limit_max",
121 .data = &sysctl_speed_limit_max,
122 .maxlen = sizeof(int),
124 .proc_handler = &proc_dointvec,
129 static ctl_table raid_dir_table[] = {
131 .ctl_name = DEV_RAID,
140 static ctl_table raid_root_table[] = {
146 .child = raid_dir_table,
151 static struct block_device_operations md_fops;
153 static int start_readonly;
156 * We have a system wide 'event count' that is incremented
157 * on any 'interesting' event, and readers of /proc/mdstat
158 * can use 'poll' or 'select' to find out when the event
162 * start array, stop array, error, add device, remove device,
163 * start build, activate spare
165 static DECLARE_WAIT_QUEUE_HEAD(md_event_waiters);
166 static atomic_t md_event_count;
167 void md_new_event(mddev_t *mddev)
169 atomic_inc(&md_event_count);
170 wake_up(&md_event_waiters);
171 sysfs_notify(&mddev->kobj, NULL, "sync_action");
173 EXPORT_SYMBOL_GPL(md_new_event);
175 /* Alternate version that can be called from interrupts
176 * when calling sysfs_notify isn't needed.
178 void md_new_event_inintr(mddev_t *mddev)
180 atomic_inc(&md_event_count);
181 wake_up(&md_event_waiters);
185 * Enables to iterate over all existing md arrays
186 * all_mddevs_lock protects this list.
188 static LIST_HEAD(all_mddevs);
189 static DEFINE_SPINLOCK(all_mddevs_lock);
193 * iterates through all used mddevs in the system.
194 * We take care to grab the all_mddevs_lock whenever navigating
195 * the list, and to always hold a refcount when unlocked.
196 * Any code which breaks out of this loop while own
197 * a reference to the current mddev and must mddev_put it.
199 #define ITERATE_MDDEV(mddev,tmp) \
201 for (({ spin_lock(&all_mddevs_lock); \
202 tmp = all_mddevs.next; \
204 ({ if (tmp != &all_mddevs) \
205 mddev_get(list_entry(tmp, mddev_t, all_mddevs));\
206 spin_unlock(&all_mddevs_lock); \
207 if (mddev) mddev_put(mddev); \
208 mddev = list_entry(tmp, mddev_t, all_mddevs); \
209 tmp != &all_mddevs;}); \
210 ({ spin_lock(&all_mddevs_lock); \
215 static int md_fail_request (request_queue_t *q, struct bio *bio)
217 bio_io_error(bio, bio->bi_size);
221 static inline mddev_t *mddev_get(mddev_t *mddev)
223 atomic_inc(&mddev->active);
227 static void mddev_put(mddev_t *mddev)
229 if (!atomic_dec_and_lock(&mddev->active, &all_mddevs_lock))
231 if (!mddev->raid_disks && list_empty(&mddev->disks)) {
232 list_del(&mddev->all_mddevs);
233 spin_unlock(&all_mddevs_lock);
234 blk_cleanup_queue(mddev->queue);
235 kobject_unregister(&mddev->kobj);
237 spin_unlock(&all_mddevs_lock);
240 static mddev_t * mddev_find(dev_t unit)
242 mddev_t *mddev, *new = NULL;
245 spin_lock(&all_mddevs_lock);
246 list_for_each_entry(mddev, &all_mddevs, all_mddevs)
247 if (mddev->unit == unit) {
249 spin_unlock(&all_mddevs_lock);
255 list_add(&new->all_mddevs, &all_mddevs);
256 spin_unlock(&all_mddevs_lock);
259 spin_unlock(&all_mddevs_lock);
261 new = kzalloc(sizeof(*new), GFP_KERNEL);
266 if (MAJOR(unit) == MD_MAJOR)
267 new->md_minor = MINOR(unit);
269 new->md_minor = MINOR(unit) >> MdpMinorShift;
271 mutex_init(&new->reconfig_mutex);
272 INIT_LIST_HEAD(&new->disks);
273 INIT_LIST_HEAD(&new->all_mddevs);
274 init_timer(&new->safemode_timer);
275 atomic_set(&new->active, 1);
276 spin_lock_init(&new->write_lock);
277 init_waitqueue_head(&new->sb_wait);
279 new->queue = blk_alloc_queue(GFP_KERNEL);
284 set_bit(QUEUE_FLAG_CLUSTER, &new->queue->queue_flags);
286 blk_queue_make_request(new->queue, md_fail_request);
291 static inline int mddev_lock(mddev_t * mddev)
293 return mutex_lock_interruptible(&mddev->reconfig_mutex);
296 static inline int mddev_trylock(mddev_t * mddev)
298 return mutex_trylock(&mddev->reconfig_mutex);
301 static inline void mddev_unlock(mddev_t * mddev)
303 mutex_unlock(&mddev->reconfig_mutex);
305 md_wakeup_thread(mddev->thread);
308 static mdk_rdev_t * find_rdev_nr(mddev_t *mddev, int nr)
311 struct list_head *tmp;
313 ITERATE_RDEV(mddev,rdev,tmp) {
314 if (rdev->desc_nr == nr)
320 static mdk_rdev_t * find_rdev(mddev_t * mddev, dev_t dev)
322 struct list_head *tmp;
325 ITERATE_RDEV(mddev,rdev,tmp) {
326 if (rdev->bdev->bd_dev == dev)
332 static struct mdk_personality *find_pers(int level, char *clevel)
334 struct mdk_personality *pers;
335 list_for_each_entry(pers, &pers_list, list) {
336 if (level != LEVEL_NONE && pers->level == level)
338 if (strcmp(pers->name, clevel)==0)
344 static inline sector_t calc_dev_sboffset(struct block_device *bdev)
346 sector_t size = bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
347 return MD_NEW_SIZE_BLOCKS(size);
350 static sector_t calc_dev_size(mdk_rdev_t *rdev, unsigned chunk_size)
354 size = rdev->sb_offset;
357 size &= ~((sector_t)chunk_size/1024 - 1);
361 static int alloc_disk_sb(mdk_rdev_t * rdev)
366 rdev->sb_page = alloc_page(GFP_KERNEL);
367 if (!rdev->sb_page) {
368 printk(KERN_ALERT "md: out of memory.\n");
375 static void free_disk_sb(mdk_rdev_t * rdev)
378 put_page(rdev->sb_page);
380 rdev->sb_page = NULL;
387 static int super_written(struct bio *bio, unsigned int bytes_done, int error)
389 mdk_rdev_t *rdev = bio->bi_private;
390 mddev_t *mddev = rdev->mddev;
394 if (error || !test_bit(BIO_UPTODATE, &bio->bi_flags))
395 md_error(mddev, rdev);
397 if (atomic_dec_and_test(&mddev->pending_writes))
398 wake_up(&mddev->sb_wait);
403 static int super_written_barrier(struct bio *bio, unsigned int bytes_done, int error)
405 struct bio *bio2 = bio->bi_private;
406 mdk_rdev_t *rdev = bio2->bi_private;
407 mddev_t *mddev = rdev->mddev;
411 if (!test_bit(BIO_UPTODATE, &bio->bi_flags) &&
412 error == -EOPNOTSUPP) {
414 /* barriers don't appear to be supported :-( */
415 set_bit(BarriersNotsupp, &rdev->flags);
416 mddev->barriers_work = 0;
417 spin_lock_irqsave(&mddev->write_lock, flags);
418 bio2->bi_next = mddev->biolist;
419 mddev->biolist = bio2;
420 spin_unlock_irqrestore(&mddev->write_lock, flags);
421 wake_up(&mddev->sb_wait);
426 bio->bi_private = rdev;
427 return super_written(bio, bytes_done, error);
430 void md_super_write(mddev_t *mddev, mdk_rdev_t *rdev,
431 sector_t sector, int size, struct page *page)
433 /* write first size bytes of page to sector of rdev
434 * Increment mddev->pending_writes before returning
435 * and decrement it on completion, waking up sb_wait
436 * if zero is reached.
437 * If an error occurred, call md_error
439 * As we might need to resubmit the request if BIO_RW_BARRIER
440 * causes ENOTSUPP, we allocate a spare bio...
442 struct bio *bio = bio_alloc(GFP_NOIO, 1);
443 int rw = (1<<BIO_RW) | (1<<BIO_RW_SYNC);
445 bio->bi_bdev = rdev->bdev;
446 bio->bi_sector = sector;
447 bio_add_page(bio, page, size, 0);
448 bio->bi_private = rdev;
449 bio->bi_end_io = super_written;
452 atomic_inc(&mddev->pending_writes);
453 if (!test_bit(BarriersNotsupp, &rdev->flags)) {
455 rw |= (1<<BIO_RW_BARRIER);
456 rbio = bio_clone(bio, GFP_NOIO);
457 rbio->bi_private = bio;
458 rbio->bi_end_io = super_written_barrier;
459 submit_bio(rw, rbio);
464 void md_super_wait(mddev_t *mddev)
466 /* wait for all superblock writes that were scheduled to complete.
467 * if any had to be retried (due to BARRIER problems), retry them
471 prepare_to_wait(&mddev->sb_wait, &wq, TASK_UNINTERRUPTIBLE);
472 if (atomic_read(&mddev->pending_writes)==0)
474 while (mddev->biolist) {
476 spin_lock_irq(&mddev->write_lock);
477 bio = mddev->biolist;
478 mddev->biolist = bio->bi_next ;
480 spin_unlock_irq(&mddev->write_lock);
481 submit_bio(bio->bi_rw, bio);
485 finish_wait(&mddev->sb_wait, &wq);
488 static int bi_complete(struct bio *bio, unsigned int bytes_done, int error)
493 complete((struct completion*)bio->bi_private);
497 int sync_page_io(struct block_device *bdev, sector_t sector, int size,
498 struct page *page, int rw)
500 struct bio *bio = bio_alloc(GFP_NOIO, 1);
501 struct completion event;
504 rw |= (1 << BIO_RW_SYNC);
507 bio->bi_sector = sector;
508 bio_add_page(bio, page, size, 0);
509 init_completion(&event);
510 bio->bi_private = &event;
511 bio->bi_end_io = bi_complete;
513 wait_for_completion(&event);
515 ret = test_bit(BIO_UPTODATE, &bio->bi_flags);
519 EXPORT_SYMBOL_GPL(sync_page_io);
521 static int read_disk_sb(mdk_rdev_t * rdev, int size)
523 char b[BDEVNAME_SIZE];
524 if (!rdev->sb_page) {
532 if (!sync_page_io(rdev->bdev, rdev->sb_offset<<1, size, rdev->sb_page, READ))
538 printk(KERN_WARNING "md: disabled device %s, could not read superblock.\n",
539 bdevname(rdev->bdev,b));
543 static int uuid_equal(mdp_super_t *sb1, mdp_super_t *sb2)
545 if ( (sb1->set_uuid0 == sb2->set_uuid0) &&
546 (sb1->set_uuid1 == sb2->set_uuid1) &&
547 (sb1->set_uuid2 == sb2->set_uuid2) &&
548 (sb1->set_uuid3 == sb2->set_uuid3))
556 static int sb_equal(mdp_super_t *sb1, mdp_super_t *sb2)
559 mdp_super_t *tmp1, *tmp2;
561 tmp1 = kmalloc(sizeof(*tmp1),GFP_KERNEL);
562 tmp2 = kmalloc(sizeof(*tmp2),GFP_KERNEL);
564 if (!tmp1 || !tmp2) {
566 printk(KERN_INFO "md.c: sb1 is not equal to sb2!\n");
574 * nr_disks is not constant
579 if (memcmp(tmp1, tmp2, MD_SB_GENERIC_CONSTANT_WORDS * 4))
590 static unsigned int calc_sb_csum(mdp_super_t * sb)
592 unsigned int disk_csum, csum;
594 disk_csum = sb->sb_csum;
596 csum = csum_partial((void *)sb, MD_SB_BYTES, 0);
597 sb->sb_csum = disk_csum;
603 * Handle superblock details.
604 * We want to be able to handle multiple superblock formats
605 * so we have a common interface to them all, and an array of
606 * different handlers.
607 * We rely on user-space to write the initial superblock, and support
608 * reading and updating of superblocks.
609 * Interface methods are:
610 * int load_super(mdk_rdev_t *dev, mdk_rdev_t *refdev, int minor_version)
611 * loads and validates a superblock on dev.
612 * if refdev != NULL, compare superblocks on both devices
614 * 0 - dev has a superblock that is compatible with refdev
615 * 1 - dev has a superblock that is compatible and newer than refdev
616 * so dev should be used as the refdev in future
617 * -EINVAL superblock incompatible or invalid
618 * -othererror e.g. -EIO
620 * int validate_super(mddev_t *mddev, mdk_rdev_t *dev)
621 * Verify that dev is acceptable into mddev.
622 * The first time, mddev->raid_disks will be 0, and data from
623 * dev should be merged in. Subsequent calls check that dev
624 * is new enough. Return 0 or -EINVAL
626 * void sync_super(mddev_t *mddev, mdk_rdev_t *dev)
627 * Update the superblock for rdev with data in mddev
628 * This does not write to disc.
634 struct module *owner;
635 int (*load_super)(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version);
636 int (*validate_super)(mddev_t *mddev, mdk_rdev_t *rdev);
637 void (*sync_super)(mddev_t *mddev, mdk_rdev_t *rdev);
641 * load_super for 0.90.0
643 static int super_90_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
645 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
651 * Calculate the position of the superblock,
652 * it's at the end of the disk.
654 * It also happens to be a multiple of 4Kb.
656 sb_offset = calc_dev_sboffset(rdev->bdev);
657 rdev->sb_offset = sb_offset;
659 ret = read_disk_sb(rdev, MD_SB_BYTES);
664 bdevname(rdev->bdev, b);
665 sb = (mdp_super_t*)page_address(rdev->sb_page);
667 if (sb->md_magic != MD_SB_MAGIC) {
668 printk(KERN_ERR "md: invalid raid superblock magic on %s\n",
673 if (sb->major_version != 0 ||
674 sb->minor_version < 90 ||
675 sb->minor_version > 91) {
676 printk(KERN_WARNING "Bad version number %d.%d on %s\n",
677 sb->major_version, sb->minor_version,
682 if (sb->raid_disks <= 0)
685 if (csum_fold(calc_sb_csum(sb)) != csum_fold(sb->sb_csum)) {
686 printk(KERN_WARNING "md: invalid superblock checksum on %s\n",
691 rdev->preferred_minor = sb->md_minor;
692 rdev->data_offset = 0;
693 rdev->sb_size = MD_SB_BYTES;
695 if (sb->level == LEVEL_MULTIPATH)
698 rdev->desc_nr = sb->this_disk.number;
704 mdp_super_t *refsb = (mdp_super_t*)page_address(refdev->sb_page);
705 if (!uuid_equal(refsb, sb)) {
706 printk(KERN_WARNING "md: %s has different UUID to %s\n",
707 b, bdevname(refdev->bdev,b2));
710 if (!sb_equal(refsb, sb)) {
711 printk(KERN_WARNING "md: %s has same UUID"
712 " but different superblock to %s\n",
713 b, bdevname(refdev->bdev, b2));
717 ev2 = md_event(refsb);
723 rdev->size = calc_dev_size(rdev, sb->chunk_size);
725 if (rdev->size < sb->size && sb->level > 1)
726 /* "this cannot possibly happen" ... */
734 * validate_super for 0.90.0
736 static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev)
739 mdp_super_t *sb = (mdp_super_t *)page_address(rdev->sb_page);
741 rdev->raid_disk = -1;
743 if (mddev->raid_disks == 0) {
744 mddev->major_version = 0;
745 mddev->minor_version = sb->minor_version;
746 mddev->patch_version = sb->patch_version;
747 mddev->persistent = ! sb->not_persistent;
748 mddev->chunk_size = sb->chunk_size;
749 mddev->ctime = sb->ctime;
750 mddev->utime = sb->utime;
751 mddev->level = sb->level;
752 mddev->clevel[0] = 0;
753 mddev->layout = sb->layout;
754 mddev->raid_disks = sb->raid_disks;
755 mddev->size = sb->size;
756 mddev->events = md_event(sb);
757 mddev->bitmap_offset = 0;
758 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
760 if (mddev->minor_version >= 91) {
761 mddev->reshape_position = sb->reshape_position;
762 mddev->delta_disks = sb->delta_disks;
763 mddev->new_level = sb->new_level;
764 mddev->new_layout = sb->new_layout;
765 mddev->new_chunk = sb->new_chunk;
767 mddev->reshape_position = MaxSector;
768 mddev->delta_disks = 0;
769 mddev->new_level = mddev->level;
770 mddev->new_layout = mddev->layout;
771 mddev->new_chunk = mddev->chunk_size;
774 if (sb->state & (1<<MD_SB_CLEAN))
775 mddev->recovery_cp = MaxSector;
777 if (sb->events_hi == sb->cp_events_hi &&
778 sb->events_lo == sb->cp_events_lo) {
779 mddev->recovery_cp = sb->recovery_cp;
781 mddev->recovery_cp = 0;
784 memcpy(mddev->uuid+0, &sb->set_uuid0, 4);
785 memcpy(mddev->uuid+4, &sb->set_uuid1, 4);
786 memcpy(mddev->uuid+8, &sb->set_uuid2, 4);
787 memcpy(mddev->uuid+12,&sb->set_uuid3, 4);
789 mddev->max_disks = MD_SB_DISKS;
791 if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&
792 mddev->bitmap_file == NULL) {
793 if (mddev->level != 1 && mddev->level != 4
794 && mddev->level != 5 && mddev->level != 6
795 && mddev->level != 10) {
796 /* FIXME use a better test */
797 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
800 mddev->bitmap_offset = mddev->default_bitmap_offset;
803 } else if (mddev->pers == NULL) {
804 /* Insist on good event counter while assembling */
805 __u64 ev1 = md_event(sb);
807 if (ev1 < mddev->events)
809 } else if (mddev->bitmap) {
810 /* if adding to array with a bitmap, then we can accept an
811 * older device ... but not too old.
813 __u64 ev1 = md_event(sb);
814 if (ev1 < mddev->bitmap->events_cleared)
816 } else /* just a hot-add of a new device, leave raid_disk at -1 */
819 if (mddev->level != LEVEL_MULTIPATH) {
820 desc = sb->disks + rdev->desc_nr;
822 if (desc->state & (1<<MD_DISK_FAULTY))
823 set_bit(Faulty, &rdev->flags);
824 else if (desc->state & (1<<MD_DISK_SYNC) /* &&
825 desc->raid_disk < mddev->raid_disks */) {
826 set_bit(In_sync, &rdev->flags);
827 rdev->raid_disk = desc->raid_disk;
829 if (desc->state & (1<<MD_DISK_WRITEMOSTLY))
830 set_bit(WriteMostly, &rdev->flags);
831 } else /* MULTIPATH are always insync */
832 set_bit(In_sync, &rdev->flags);
837 * sync_super for 0.90.0
839 static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev)
842 struct list_head *tmp;
844 int next_spare = mddev->raid_disks;
847 /* make rdev->sb match mddev data..
850 * 2/ Add info for each disk, keeping track of highest desc_nr (next_spare);
851 * 3/ any empty disks < next_spare become removed
853 * disks[0] gets initialised to REMOVED because
854 * we cannot be sure from other fields if it has
855 * been initialised or not.
858 int active=0, working=0,failed=0,spare=0,nr_disks=0;
860 rdev->sb_size = MD_SB_BYTES;
862 sb = (mdp_super_t*)page_address(rdev->sb_page);
864 memset(sb, 0, sizeof(*sb));
866 sb->md_magic = MD_SB_MAGIC;
867 sb->major_version = mddev->major_version;
868 sb->patch_version = mddev->patch_version;
869 sb->gvalid_words = 0; /* ignored */
870 memcpy(&sb->set_uuid0, mddev->uuid+0, 4);
871 memcpy(&sb->set_uuid1, mddev->uuid+4, 4);
872 memcpy(&sb->set_uuid2, mddev->uuid+8, 4);
873 memcpy(&sb->set_uuid3, mddev->uuid+12,4);
875 sb->ctime = mddev->ctime;
876 sb->level = mddev->level;
877 sb->size = mddev->size;
878 sb->raid_disks = mddev->raid_disks;
879 sb->md_minor = mddev->md_minor;
880 sb->not_persistent = !mddev->persistent;
881 sb->utime = mddev->utime;
883 sb->events_hi = (mddev->events>>32);
884 sb->events_lo = (u32)mddev->events;
886 if (mddev->reshape_position == MaxSector)
887 sb->minor_version = 90;
889 sb->minor_version = 91;
890 sb->reshape_position = mddev->reshape_position;
891 sb->new_level = mddev->new_level;
892 sb->delta_disks = mddev->delta_disks;
893 sb->new_layout = mddev->new_layout;
894 sb->new_chunk = mddev->new_chunk;
896 mddev->minor_version = sb->minor_version;
899 sb->recovery_cp = mddev->recovery_cp;
900 sb->cp_events_hi = (mddev->events>>32);
901 sb->cp_events_lo = (u32)mddev->events;
902 if (mddev->recovery_cp == MaxSector)
903 sb->state = (1<< MD_SB_CLEAN);
907 sb->layout = mddev->layout;
908 sb->chunk_size = mddev->chunk_size;
910 if (mddev->bitmap && mddev->bitmap_file == NULL)
911 sb->state |= (1<<MD_SB_BITMAP_PRESENT);
913 sb->disks[0].state = (1<<MD_DISK_REMOVED);
914 ITERATE_RDEV(mddev,rdev2,tmp) {
917 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
918 && !test_bit(Faulty, &rdev2->flags))
919 desc_nr = rdev2->raid_disk;
921 desc_nr = next_spare++;
922 rdev2->desc_nr = desc_nr;
923 d = &sb->disks[rdev2->desc_nr];
925 d->number = rdev2->desc_nr;
926 d->major = MAJOR(rdev2->bdev->bd_dev);
927 d->minor = MINOR(rdev2->bdev->bd_dev);
928 if (rdev2->raid_disk >= 0 && test_bit(In_sync, &rdev2->flags)
929 && !test_bit(Faulty, &rdev2->flags))
930 d->raid_disk = rdev2->raid_disk;
932 d->raid_disk = rdev2->desc_nr; /* compatibility */
933 if (test_bit(Faulty, &rdev2->flags))
934 d->state = (1<<MD_DISK_FAULTY);
935 else if (test_bit(In_sync, &rdev2->flags)) {
936 d->state = (1<<MD_DISK_ACTIVE);
937 d->state |= (1<<MD_DISK_SYNC);
945 if (test_bit(WriteMostly, &rdev2->flags))
946 d->state |= (1<<MD_DISK_WRITEMOSTLY);
948 /* now set the "removed" and "faulty" bits on any missing devices */
949 for (i=0 ; i < mddev->raid_disks ; i++) {
950 mdp_disk_t *d = &sb->disks[i];
951 if (d->state == 0 && d->number == 0) {
954 d->state = (1<<MD_DISK_REMOVED);
955 d->state |= (1<<MD_DISK_FAULTY);
959 sb->nr_disks = nr_disks;
960 sb->active_disks = active;
961 sb->working_disks = working;
962 sb->failed_disks = failed;
963 sb->spare_disks = spare;
965 sb->this_disk = sb->disks[rdev->desc_nr];
966 sb->sb_csum = calc_sb_csum(sb);
970 * version 1 superblock
973 static unsigned int calc_sb_1_csum(struct mdp_superblock_1 * sb)
975 unsigned int disk_csum, csum;
976 unsigned long long newcsum;
977 int size = 256 + le32_to_cpu(sb->max_dev)*2;
978 unsigned int *isuper = (unsigned int*)sb;
981 disk_csum = sb->sb_csum;
984 for (i=0; size>=4; size -= 4 )
985 newcsum += le32_to_cpu(*isuper++);
988 newcsum += le16_to_cpu(*(unsigned short*) isuper);
990 csum = (newcsum & 0xffffffff) + (newcsum >> 32);
991 sb->sb_csum = disk_csum;
992 return cpu_to_le32(csum);
995 static int super_1_load(mdk_rdev_t *rdev, mdk_rdev_t *refdev, int minor_version)
997 struct mdp_superblock_1 *sb;
1000 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1004 * Calculate the position of the superblock.
1005 * It is always aligned to a 4K boundary and
1006 * depeding on minor_version, it can be:
1007 * 0: At least 8K, but less than 12K, from end of device
1008 * 1: At start of device
1009 * 2: 4K from start of device.
1011 switch(minor_version) {
1013 sb_offset = rdev->bdev->bd_inode->i_size >> 9;
1015 sb_offset &= ~(sector_t)(4*2-1);
1016 /* convert from sectors to K */
1028 rdev->sb_offset = sb_offset;
1030 /* superblock is rarely larger than 1K, but it can be larger,
1031 * and it is safe to read 4k, so we do that
1033 ret = read_disk_sb(rdev, 4096);
1034 if (ret) return ret;
1037 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1039 if (sb->magic != cpu_to_le32(MD_SB_MAGIC) ||
1040 sb->major_version != cpu_to_le32(1) ||
1041 le32_to_cpu(sb->max_dev) > (4096-256)/2 ||
1042 le64_to_cpu(sb->super_offset) != (rdev->sb_offset<<1) ||
1043 (le32_to_cpu(sb->feature_map) & ~MD_FEATURE_ALL) != 0)
1046 if (calc_sb_1_csum(sb) != sb->sb_csum) {
1047 printk("md: invalid superblock checksum on %s\n",
1048 bdevname(rdev->bdev,b));
1051 if (le64_to_cpu(sb->data_size) < 10) {
1052 printk("md: data_size too small on %s\n",
1053 bdevname(rdev->bdev,b));
1056 rdev->preferred_minor = 0xffff;
1057 rdev->data_offset = le64_to_cpu(sb->data_offset);
1058 atomic_set(&rdev->corrected_errors, le32_to_cpu(sb->cnt_corrected_read));
1060 rdev->sb_size = le32_to_cpu(sb->max_dev) * 2 + 256;
1061 bmask = queue_hardsect_size(rdev->bdev->bd_disk->queue)-1;
1062 if (rdev->sb_size & bmask)
1063 rdev-> sb_size = (rdev->sb_size | bmask)+1;
1069 struct mdp_superblock_1 *refsb =
1070 (struct mdp_superblock_1*)page_address(refdev->sb_page);
1072 if (memcmp(sb->set_uuid, refsb->set_uuid, 16) != 0 ||
1073 sb->level != refsb->level ||
1074 sb->layout != refsb->layout ||
1075 sb->chunksize != refsb->chunksize) {
1076 printk(KERN_WARNING "md: %s has strangely different"
1077 " superblock to %s\n",
1078 bdevname(rdev->bdev,b),
1079 bdevname(refdev->bdev,b2));
1082 ev1 = le64_to_cpu(sb->events);
1083 ev2 = le64_to_cpu(refsb->events);
1091 rdev->size = ((rdev->bdev->bd_inode->i_size>>9) - le64_to_cpu(sb->data_offset)) / 2;
1093 rdev->size = rdev->sb_offset;
1094 if (rdev->size < le64_to_cpu(sb->data_size)/2)
1096 rdev->size = le64_to_cpu(sb->data_size)/2;
1097 if (le32_to_cpu(sb->chunksize))
1098 rdev->size &= ~((sector_t)le32_to_cpu(sb->chunksize)/2 - 1);
1100 if (le32_to_cpu(sb->size) > rdev->size*2)
1105 static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev)
1107 struct mdp_superblock_1 *sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1109 rdev->raid_disk = -1;
1111 if (mddev->raid_disks == 0) {
1112 mddev->major_version = 1;
1113 mddev->patch_version = 0;
1114 mddev->persistent = 1;
1115 mddev->chunk_size = le32_to_cpu(sb->chunksize) << 9;
1116 mddev->ctime = le64_to_cpu(sb->ctime) & ((1ULL << 32)-1);
1117 mddev->utime = le64_to_cpu(sb->utime) & ((1ULL << 32)-1);
1118 mddev->level = le32_to_cpu(sb->level);
1119 mddev->clevel[0] = 0;
1120 mddev->layout = le32_to_cpu(sb->layout);
1121 mddev->raid_disks = le32_to_cpu(sb->raid_disks);
1122 mddev->size = le64_to_cpu(sb->size)/2;
1123 mddev->events = le64_to_cpu(sb->events);
1124 mddev->bitmap_offset = 0;
1125 mddev->default_bitmap_offset = 1024 >> 9;
1127 mddev->recovery_cp = le64_to_cpu(sb->resync_offset);
1128 memcpy(mddev->uuid, sb->set_uuid, 16);
1130 mddev->max_disks = (4096-256)/2;
1132 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&
1133 mddev->bitmap_file == NULL ) {
1134 if (mddev->level != 1 && mddev->level != 5 && mddev->level != 6
1135 && mddev->level != 10) {
1136 printk(KERN_WARNING "md: bitmaps not supported for this level.\n");
1139 mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);
1141 if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {
1142 mddev->reshape_position = le64_to_cpu(sb->reshape_position);
1143 mddev->delta_disks = le32_to_cpu(sb->delta_disks);
1144 mddev->new_level = le32_to_cpu(sb->new_level);
1145 mddev->new_layout = le32_to_cpu(sb->new_layout);
1146 mddev->new_chunk = le32_to_cpu(sb->new_chunk)<<9;
1148 mddev->reshape_position = MaxSector;
1149 mddev->delta_disks = 0;
1150 mddev->new_level = mddev->level;
1151 mddev->new_layout = mddev->layout;
1152 mddev->new_chunk = mddev->chunk_size;
1155 } else if (mddev->pers == NULL) {
1156 /* Insist of good event counter while assembling */
1157 __u64 ev1 = le64_to_cpu(sb->events);
1159 if (ev1 < mddev->events)
1161 } else if (mddev->bitmap) {
1162 /* If adding to array with a bitmap, then we can accept an
1163 * older device, but not too old.
1165 __u64 ev1 = le64_to_cpu(sb->events);
1166 if (ev1 < mddev->bitmap->events_cleared)
1168 } else /* just a hot-add of a new device, leave raid_disk at -1 */
1171 if (mddev->level != LEVEL_MULTIPATH) {
1173 rdev->desc_nr = le32_to_cpu(sb->dev_number);
1174 role = le16_to_cpu(sb->dev_roles[rdev->desc_nr]);
1176 case 0xffff: /* spare */
1178 case 0xfffe: /* faulty */
1179 set_bit(Faulty, &rdev->flags);
1182 if ((le32_to_cpu(sb->feature_map) &
1183 MD_FEATURE_RECOVERY_OFFSET))
1184 rdev->recovery_offset = le64_to_cpu(sb->recovery_offset);
1186 set_bit(In_sync, &rdev->flags);
1187 rdev->raid_disk = role;
1190 if (sb->devflags & WriteMostly1)
1191 set_bit(WriteMostly, &rdev->flags);
1192 } else /* MULTIPATH are always insync */
1193 set_bit(In_sync, &rdev->flags);
1198 static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev)
1200 struct mdp_superblock_1 *sb;
1201 struct list_head *tmp;
1204 /* make rdev->sb match mddev and rdev data. */
1206 sb = (struct mdp_superblock_1*)page_address(rdev->sb_page);
1208 sb->feature_map = 0;
1210 sb->recovery_offset = cpu_to_le64(0);
1211 memset(sb->pad1, 0, sizeof(sb->pad1));
1212 memset(sb->pad2, 0, sizeof(sb->pad2));
1213 memset(sb->pad3, 0, sizeof(sb->pad3));
1215 sb->utime = cpu_to_le64((__u64)mddev->utime);
1216 sb->events = cpu_to_le64(mddev->events);
1218 sb->resync_offset = cpu_to_le64(mddev->recovery_cp);
1220 sb->resync_offset = cpu_to_le64(0);
1222 sb->cnt_corrected_read = atomic_read(&rdev->corrected_errors);
1224 sb->raid_disks = cpu_to_le32(mddev->raid_disks);
1225 sb->size = cpu_to_le64(mddev->size<<1);
1227 if (mddev->bitmap && mddev->bitmap_file == NULL) {
1228 sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);
1229 sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);
1232 if (rdev->raid_disk >= 0 &&
1233 !test_bit(In_sync, &rdev->flags) &&
1234 rdev->recovery_offset > 0) {
1235 sb->feature_map |= cpu_to_le32(MD_FEATURE_RECOVERY_OFFSET);
1236 sb->recovery_offset = cpu_to_le64(rdev->recovery_offset);
1239 if (mddev->reshape_position != MaxSector) {
1240 sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE);
1241 sb->reshape_position = cpu_to_le64(mddev->reshape_position);
1242 sb->new_layout = cpu_to_le32(mddev->new_layout);
1243 sb->delta_disks = cpu_to_le32(mddev->delta_disks);
1244 sb->new_level = cpu_to_le32(mddev->new_level);
1245 sb->new_chunk = cpu_to_le32(mddev->new_chunk>>9);
1249 ITERATE_RDEV(mddev,rdev2,tmp)
1250 if (rdev2->desc_nr+1 > max_dev)
1251 max_dev = rdev2->desc_nr+1;
1253 sb->max_dev = cpu_to_le32(max_dev);
1254 for (i=0; i<max_dev;i++)
1255 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1257 ITERATE_RDEV(mddev,rdev2,tmp) {
1259 if (test_bit(Faulty, &rdev2->flags))
1260 sb->dev_roles[i] = cpu_to_le16(0xfffe);
1261 else if (test_bit(In_sync, &rdev2->flags))
1262 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1263 else if (rdev2->raid_disk >= 0 && rdev2->recovery_offset > 0)
1264 sb->dev_roles[i] = cpu_to_le16(rdev2->raid_disk);
1266 sb->dev_roles[i] = cpu_to_le16(0xffff);
1269 sb->sb_csum = calc_sb_1_csum(sb);
1273 static struct super_type super_types[] = {
1276 .owner = THIS_MODULE,
1277 .load_super = super_90_load,
1278 .validate_super = super_90_validate,
1279 .sync_super = super_90_sync,
1283 .owner = THIS_MODULE,
1284 .load_super = super_1_load,
1285 .validate_super = super_1_validate,
1286 .sync_super = super_1_sync,
1290 static mdk_rdev_t * match_dev_unit(mddev_t *mddev, mdk_rdev_t *dev)
1292 struct list_head *tmp;
1295 ITERATE_RDEV(mddev,rdev,tmp)
1296 if (rdev->bdev->bd_contains == dev->bdev->bd_contains)
1302 static int match_mddev_units(mddev_t *mddev1, mddev_t *mddev2)
1304 struct list_head *tmp;
1307 ITERATE_RDEV(mddev1,rdev,tmp)
1308 if (match_dev_unit(mddev2, rdev))
1314 static LIST_HEAD(pending_raid_disks);
1316 static int bind_rdev_to_array(mdk_rdev_t * rdev, mddev_t * mddev)
1318 mdk_rdev_t *same_pdev;
1319 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
1327 /* make sure rdev->size exceeds mddev->size */
1328 if (rdev->size && (mddev->size == 0 || rdev->size < mddev->size)) {
1330 /* Cannot change size, so fail */
1333 mddev->size = rdev->size;
1335 same_pdev = match_dev_unit(mddev, rdev);
1338 "%s: WARNING: %s appears to be on the same physical"
1339 " disk as %s. True\n protection against single-disk"
1340 " failure might be compromised.\n",
1341 mdname(mddev), bdevname(rdev->bdev,b),
1342 bdevname(same_pdev->bdev,b2));
1344 /* Verify rdev->desc_nr is unique.
1345 * If it is -1, assign a free number, else
1346 * check number is not in use
1348 if (rdev->desc_nr < 0) {
1350 if (mddev->pers) choice = mddev->raid_disks;
1351 while (find_rdev_nr(mddev, choice))
1353 rdev->desc_nr = choice;
1355 if (find_rdev_nr(mddev, rdev->desc_nr))
1358 bdevname(rdev->bdev,b);
1359 if (kobject_set_name(&rdev->kobj, "dev-%s", b) < 0)
1361 while ( (s=strchr(rdev->kobj.k_name, '/')) != NULL)
1364 list_add(&rdev->same_set, &mddev->disks);
1365 rdev->mddev = mddev;
1366 printk(KERN_INFO "md: bind<%s>\n", b);
1368 rdev->kobj.parent = &mddev->kobj;
1369 kobject_add(&rdev->kobj);
1371 if (rdev->bdev->bd_part)
1372 ko = &rdev->bdev->bd_part->kobj;
1374 ko = &rdev->bdev->bd_disk->kobj;
1375 sysfs_create_link(&rdev->kobj, ko, "block");
1376 bd_claim_by_disk(rdev->bdev, rdev, mddev->gendisk);
1380 static void unbind_rdev_from_array(mdk_rdev_t * rdev)
1382 char b[BDEVNAME_SIZE];
1387 bd_release_from_disk(rdev->bdev, rdev->mddev->gendisk);
1388 list_del_init(&rdev->same_set);
1389 printk(KERN_INFO "md: unbind<%s>\n", bdevname(rdev->bdev,b));
1391 sysfs_remove_link(&rdev->kobj, "block");
1392 kobject_del(&rdev->kobj);
1396 * prevent the device from being mounted, repartitioned or
1397 * otherwise reused by a RAID array (or any other kernel
1398 * subsystem), by bd_claiming the device.
1400 static int lock_rdev(mdk_rdev_t *rdev, dev_t dev)
1403 struct block_device *bdev;
1404 char b[BDEVNAME_SIZE];
1406 bdev = open_by_devnum(dev, FMODE_READ|FMODE_WRITE);
1408 printk(KERN_ERR "md: could not open %s.\n",
1409 __bdevname(dev, b));
1410 return PTR_ERR(bdev);
1412 err = bd_claim(bdev, rdev);
1414 printk(KERN_ERR "md: could not bd_claim %s.\n",
1423 static void unlock_rdev(mdk_rdev_t *rdev)
1425 struct block_device *bdev = rdev->bdev;
1433 void md_autodetect_dev(dev_t dev);
1435 static void export_rdev(mdk_rdev_t * rdev)
1437 char b[BDEVNAME_SIZE];
1438 printk(KERN_INFO "md: export_rdev(%s)\n",
1439 bdevname(rdev->bdev,b));
1443 list_del_init(&rdev->same_set);
1445 md_autodetect_dev(rdev->bdev->bd_dev);
1448 kobject_put(&rdev->kobj);
1451 static void kick_rdev_from_array(mdk_rdev_t * rdev)
1453 unbind_rdev_from_array(rdev);
1457 static void export_array(mddev_t *mddev)
1459 struct list_head *tmp;
1462 ITERATE_RDEV(mddev,rdev,tmp) {
1467 kick_rdev_from_array(rdev);
1469 if (!list_empty(&mddev->disks))
1471 mddev->raid_disks = 0;
1472 mddev->major_version = 0;
1475 static void print_desc(mdp_disk_t *desc)
1477 printk(" DISK<N:%d,(%d,%d),R:%d,S:%d>\n", desc->number,
1478 desc->major,desc->minor,desc->raid_disk,desc->state);
1481 static void print_sb(mdp_super_t *sb)
1486 "md: SB: (V:%d.%d.%d) ID:<%08x.%08x.%08x.%08x> CT:%08x\n",
1487 sb->major_version, sb->minor_version, sb->patch_version,
1488 sb->set_uuid0, sb->set_uuid1, sb->set_uuid2, sb->set_uuid3,
1490 printk(KERN_INFO "md: L%d S%08d ND:%d RD:%d md%d LO:%d CS:%d\n",
1491 sb->level, sb->size, sb->nr_disks, sb->raid_disks,
1492 sb->md_minor, sb->layout, sb->chunk_size);
1493 printk(KERN_INFO "md: UT:%08x ST:%d AD:%d WD:%d"
1494 " FD:%d SD:%d CSUM:%08x E:%08lx\n",
1495 sb->utime, sb->state, sb->active_disks, sb->working_disks,
1496 sb->failed_disks, sb->spare_disks,
1497 sb->sb_csum, (unsigned long)sb->events_lo);
1500 for (i = 0; i < MD_SB_DISKS; i++) {
1503 desc = sb->disks + i;
1504 if (desc->number || desc->major || desc->minor ||
1505 desc->raid_disk || (desc->state && (desc->state != 4))) {
1506 printk(" D %2d: ", i);
1510 printk(KERN_INFO "md: THIS: ");
1511 print_desc(&sb->this_disk);
1515 static void print_rdev(mdk_rdev_t *rdev)
1517 char b[BDEVNAME_SIZE];
1518 printk(KERN_INFO "md: rdev %s, SZ:%08llu F:%d S:%d DN:%u\n",
1519 bdevname(rdev->bdev,b), (unsigned long long)rdev->size,
1520 test_bit(Faulty, &rdev->flags), test_bit(In_sync, &rdev->flags),
1522 if (rdev->sb_loaded) {
1523 printk(KERN_INFO "md: rdev superblock:\n");
1524 print_sb((mdp_super_t*)page_address(rdev->sb_page));
1526 printk(KERN_INFO "md: no rdev superblock!\n");
1529 static void md_print_devices(void)
1531 struct list_head *tmp, *tmp2;
1534 char b[BDEVNAME_SIZE];
1537 printk("md: **********************************\n");
1538 printk("md: * <COMPLETE RAID STATE PRINTOUT> *\n");
1539 printk("md: **********************************\n");
1540 ITERATE_MDDEV(mddev,tmp) {
1543 bitmap_print_sb(mddev->bitmap);
1545 printk("%s: ", mdname(mddev));
1546 ITERATE_RDEV(mddev,rdev,tmp2)
1547 printk("<%s>", bdevname(rdev->bdev,b));
1550 ITERATE_RDEV(mddev,rdev,tmp2)
1553 printk("md: **********************************\n");
1558 static void sync_sbs(mddev_t * mddev)
1561 struct list_head *tmp;
1563 ITERATE_RDEV(mddev,rdev,tmp) {
1564 super_types[mddev->major_version].
1565 sync_super(mddev, rdev);
1566 rdev->sb_loaded = 1;
1570 void md_update_sb(mddev_t * mddev)
1573 struct list_head *tmp;
1578 spin_lock_irq(&mddev->write_lock);
1579 sync_req = mddev->in_sync;
1580 mddev->utime = get_seconds();
1583 if (!mddev->events) {
1585 * oops, this 64-bit counter should never wrap.
1586 * Either we are in around ~1 trillion A.C., assuming
1587 * 1 reboot per second, or we have a bug:
1592 mddev->sb_dirty = 2;
1596 * do not write anything to disk if using
1597 * nonpersistent superblocks
1599 if (!mddev->persistent) {
1600 mddev->sb_dirty = 0;
1601 spin_unlock_irq(&mddev->write_lock);
1602 wake_up(&mddev->sb_wait);
1605 spin_unlock_irq(&mddev->write_lock);
1608 "md: updating %s RAID superblock on device (in sync %d)\n",
1609 mdname(mddev),mddev->in_sync);
1611 err = bitmap_update_sb(mddev->bitmap);
1612 ITERATE_RDEV(mddev,rdev,tmp) {
1613 char b[BDEVNAME_SIZE];
1614 dprintk(KERN_INFO "md: ");
1615 if (test_bit(Faulty, &rdev->flags))
1616 dprintk("(skipping faulty ");
1618 dprintk("%s ", bdevname(rdev->bdev,b));
1619 if (!test_bit(Faulty, &rdev->flags)) {
1620 md_super_write(mddev,rdev,
1621 rdev->sb_offset<<1, rdev->sb_size,
1623 dprintk(KERN_INFO "(write) %s's sb offset: %llu\n",
1624 bdevname(rdev->bdev,b),
1625 (unsigned long long)rdev->sb_offset);
1629 if (mddev->level == LEVEL_MULTIPATH)
1630 /* only need to write one superblock... */
1633 md_super_wait(mddev);
1634 /* if there was a failure, sb_dirty was set to 1, and we re-write super */
1636 spin_lock_irq(&mddev->write_lock);
1637 if (mddev->in_sync != sync_req|| mddev->sb_dirty == 1) {
1638 /* have to write it out again */
1639 spin_unlock_irq(&mddev->write_lock);
1642 mddev->sb_dirty = 0;
1643 spin_unlock_irq(&mddev->write_lock);
1644 wake_up(&mddev->sb_wait);
1647 EXPORT_SYMBOL_GPL(md_update_sb);
1649 /* words written to sysfs files may, or my not, be \n terminated.
1650 * We want to accept with case. For this we use cmd_match.
1652 static int cmd_match(const char *cmd, const char *str)
1654 /* See if cmd, written into a sysfs file, matches
1655 * str. They must either be the same, or cmd can
1656 * have a trailing newline
1658 while (*cmd && *str && *cmd == *str) {
1669 struct rdev_sysfs_entry {
1670 struct attribute attr;
1671 ssize_t (*show)(mdk_rdev_t *, char *);
1672 ssize_t (*store)(mdk_rdev_t *, const char *, size_t);
1676 state_show(mdk_rdev_t *rdev, char *page)
1681 if (test_bit(Faulty, &rdev->flags)) {
1682 len+= sprintf(page+len, "%sfaulty",sep);
1685 if (test_bit(In_sync, &rdev->flags)) {
1686 len += sprintf(page+len, "%sin_sync",sep);
1689 if (!test_bit(Faulty, &rdev->flags) &&
1690 !test_bit(In_sync, &rdev->flags)) {
1691 len += sprintf(page+len, "%sspare", sep);
1694 return len+sprintf(page+len, "\n");
1697 static struct rdev_sysfs_entry
1698 rdev_state = __ATTR_RO(state);
1701 super_show(mdk_rdev_t *rdev, char *page)
1703 if (rdev->sb_loaded && rdev->sb_size) {
1704 memcpy(page, page_address(rdev->sb_page), rdev->sb_size);
1705 return rdev->sb_size;
1709 static struct rdev_sysfs_entry rdev_super = __ATTR_RO(super);
1712 errors_show(mdk_rdev_t *rdev, char *page)
1714 return sprintf(page, "%d\n", atomic_read(&rdev->corrected_errors));
1718 errors_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1721 unsigned long n = simple_strtoul(buf, &e, 10);
1722 if (*buf && (*e == 0 || *e == '\n')) {
1723 atomic_set(&rdev->corrected_errors, n);
1728 static struct rdev_sysfs_entry rdev_errors =
1729 __ATTR(errors, 0644, errors_show, errors_store);
1732 slot_show(mdk_rdev_t *rdev, char *page)
1734 if (rdev->raid_disk < 0)
1735 return sprintf(page, "none\n");
1737 return sprintf(page, "%d\n", rdev->raid_disk);
1741 slot_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1744 int slot = simple_strtoul(buf, &e, 10);
1745 if (strncmp(buf, "none", 4)==0)
1747 else if (e==buf || (*e && *e!= '\n'))
1749 if (rdev->mddev->pers)
1750 /* Cannot set slot in active array (yet) */
1752 if (slot >= rdev->mddev->raid_disks)
1754 rdev->raid_disk = slot;
1755 /* assume it is working */
1757 set_bit(In_sync, &rdev->flags);
1762 static struct rdev_sysfs_entry rdev_slot =
1763 __ATTR(slot, 0644, slot_show, slot_store);
1766 offset_show(mdk_rdev_t *rdev, char *page)
1768 return sprintf(page, "%llu\n", (unsigned long long)rdev->data_offset);
1772 offset_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1775 unsigned long long offset = simple_strtoull(buf, &e, 10);
1776 if (e==buf || (*e && *e != '\n'))
1778 if (rdev->mddev->pers)
1780 rdev->data_offset = offset;
1784 static struct rdev_sysfs_entry rdev_offset =
1785 __ATTR(offset, 0644, offset_show, offset_store);
1788 rdev_size_show(mdk_rdev_t *rdev, char *page)
1790 return sprintf(page, "%llu\n", (unsigned long long)rdev->size);
1794 rdev_size_store(mdk_rdev_t *rdev, const char *buf, size_t len)
1797 unsigned long long size = simple_strtoull(buf, &e, 10);
1798 if (e==buf || (*e && *e != '\n'))
1800 if (rdev->mddev->pers)
1803 if (size < rdev->mddev->size || rdev->mddev->size == 0)
1804 rdev->mddev->size = size;
1808 static struct rdev_sysfs_entry rdev_size =
1809 __ATTR(size, 0644, rdev_size_show, rdev_size_store);
1811 static struct attribute *rdev_default_attrs[] = {
1821 rdev_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
1823 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1824 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1828 return entry->show(rdev, page);
1832 rdev_attr_store(struct kobject *kobj, struct attribute *attr,
1833 const char *page, size_t length)
1835 struct rdev_sysfs_entry *entry = container_of(attr, struct rdev_sysfs_entry, attr);
1836 mdk_rdev_t *rdev = container_of(kobj, mdk_rdev_t, kobj);
1840 return entry->store(rdev, page, length);
1843 static void rdev_free(struct kobject *ko)
1845 mdk_rdev_t *rdev = container_of(ko, mdk_rdev_t, kobj);
1848 static struct sysfs_ops rdev_sysfs_ops = {
1849 .show = rdev_attr_show,
1850 .store = rdev_attr_store,
1852 static struct kobj_type rdev_ktype = {
1853 .release = rdev_free,
1854 .sysfs_ops = &rdev_sysfs_ops,
1855 .default_attrs = rdev_default_attrs,
1859 * Import a device. If 'super_format' >= 0, then sanity check the superblock
1861 * mark the device faulty if:
1863 * - the device is nonexistent (zero size)
1864 * - the device has no valid superblock
1866 * a faulty rdev _never_ has rdev->sb set.
1868 static mdk_rdev_t *md_import_device(dev_t newdev, int super_format, int super_minor)
1870 char b[BDEVNAME_SIZE];
1875 rdev = kzalloc(sizeof(*rdev), GFP_KERNEL);
1877 printk(KERN_ERR "md: could not alloc mem for new device!\n");
1878 return ERR_PTR(-ENOMEM);
1881 if ((err = alloc_disk_sb(rdev)))
1884 err = lock_rdev(rdev, newdev);
1888 rdev->kobj.parent = NULL;
1889 rdev->kobj.ktype = &rdev_ktype;
1890 kobject_init(&rdev->kobj);
1894 rdev->data_offset = 0;
1895 atomic_set(&rdev->nr_pending, 0);
1896 atomic_set(&rdev->read_errors, 0);
1897 atomic_set(&rdev->corrected_errors, 0);
1899 size = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
1902 "md: %s has zero or unknown size, marking faulty!\n",
1903 bdevname(rdev->bdev,b));
1908 if (super_format >= 0) {
1909 err = super_types[super_format].
1910 load_super(rdev, NULL, super_minor);
1911 if (err == -EINVAL) {
1913 "md: %s has invalid sb, not importing!\n",
1914 bdevname(rdev->bdev,b));
1919 "md: could not read %s's sb, not importing!\n",
1920 bdevname(rdev->bdev,b));
1924 INIT_LIST_HEAD(&rdev->same_set);
1929 if (rdev->sb_page) {
1935 return ERR_PTR(err);
1939 * Check a full RAID array for plausibility
1943 static void analyze_sbs(mddev_t * mddev)
1946 struct list_head *tmp;
1947 mdk_rdev_t *rdev, *freshest;
1948 char b[BDEVNAME_SIZE];
1951 ITERATE_RDEV(mddev,rdev,tmp)
1952 switch (super_types[mddev->major_version].
1953 load_super(rdev, freshest, mddev->minor_version)) {
1961 "md: fatal superblock inconsistency in %s"
1962 " -- removing from array\n",
1963 bdevname(rdev->bdev,b));
1964 kick_rdev_from_array(rdev);
1968 super_types[mddev->major_version].
1969 validate_super(mddev, freshest);
1972 ITERATE_RDEV(mddev,rdev,tmp) {
1973 if (rdev != freshest)
1974 if (super_types[mddev->major_version].
1975 validate_super(mddev, rdev)) {
1976 printk(KERN_WARNING "md: kicking non-fresh %s"
1978 bdevname(rdev->bdev,b));
1979 kick_rdev_from_array(rdev);
1982 if (mddev->level == LEVEL_MULTIPATH) {
1983 rdev->desc_nr = i++;
1984 rdev->raid_disk = rdev->desc_nr;
1985 set_bit(In_sync, &rdev->flags);
1991 if (mddev->recovery_cp != MaxSector &&
1993 printk(KERN_ERR "md: %s: raid array is not clean"
1994 " -- starting background reconstruction\n",
2000 safe_delay_show(mddev_t *mddev, char *page)
2002 int msec = (mddev->safemode_delay*1000)/HZ;
2003 return sprintf(page, "%d.%03d\n", msec/1000, msec%1000);
2006 safe_delay_store(mddev_t *mddev, const char *cbuf, size_t len)
2014 /* remove a period, and count digits after it */
2015 if (len >= sizeof(buf))
2017 strlcpy(buf, cbuf, len);
2019 for (i=0; i<len; i++) {
2021 if (isdigit(buf[i])) {
2026 } else if (buf[i] == '.') {
2031 msec = simple_strtoul(buf, &e, 10);
2032 if (e == buf || (*e && *e != '\n'))
2034 msec = (msec * 1000) / scale;
2036 mddev->safemode_delay = 0;
2038 mddev->safemode_delay = (msec*HZ)/1000;
2039 if (mddev->safemode_delay == 0)
2040 mddev->safemode_delay = 1;
2044 static struct md_sysfs_entry md_safe_delay =
2045 __ATTR(safe_mode_delay, 0644,safe_delay_show, safe_delay_store);
2048 level_show(mddev_t *mddev, char *page)
2050 struct mdk_personality *p = mddev->pers;
2052 return sprintf(page, "%s\n", p->name);
2053 else if (mddev->clevel[0])
2054 return sprintf(page, "%s\n", mddev->clevel);
2055 else if (mddev->level != LEVEL_NONE)
2056 return sprintf(page, "%d\n", mddev->level);
2062 level_store(mddev_t *mddev, const char *buf, size_t len)
2069 if (len >= sizeof(mddev->clevel))
2071 strncpy(mddev->clevel, buf, len);
2072 if (mddev->clevel[len-1] == '\n')
2074 mddev->clevel[len] = 0;
2075 mddev->level = LEVEL_NONE;
2079 static struct md_sysfs_entry md_level =
2080 __ATTR(level, 0644, level_show, level_store);
2083 raid_disks_show(mddev_t *mddev, char *page)
2085 if (mddev->raid_disks == 0)
2087 return sprintf(page, "%d\n", mddev->raid_disks);
2090 static int update_raid_disks(mddev_t *mddev, int raid_disks);
2093 raid_disks_store(mddev_t *mddev, const char *buf, size_t len)
2095 /* can only set raid_disks if array is not yet active */
2098 unsigned long n = simple_strtoul(buf, &e, 10);
2100 if (!*buf || (*e && *e != '\n'))
2104 rv = update_raid_disks(mddev, n);
2106 mddev->raid_disks = n;
2107 return rv ? rv : len;
2109 static struct md_sysfs_entry md_raid_disks =
2110 __ATTR(raid_disks, 0644, raid_disks_show, raid_disks_store);
2113 chunk_size_show(mddev_t *mddev, char *page)
2115 return sprintf(page, "%d\n", mddev->chunk_size);
2119 chunk_size_store(mddev_t *mddev, const char *buf, size_t len)
2121 /* can only set chunk_size if array is not yet active */
2123 unsigned long n = simple_strtoul(buf, &e, 10);
2127 if (!*buf || (*e && *e != '\n'))
2130 mddev->chunk_size = n;
2133 static struct md_sysfs_entry md_chunk_size =
2134 __ATTR(chunk_size, 0644, chunk_size_show, chunk_size_store);
2137 null_show(mddev_t *mddev, char *page)
2143 new_dev_store(mddev_t *mddev, const char *buf, size_t len)
2145 /* buf must be %d:%d\n? giving major and minor numbers */
2146 /* The new device is added to the array.
2147 * If the array has a persistent superblock, we read the
2148 * superblock to initialise info and check validity.
2149 * Otherwise, only checking done is that in bind_rdev_to_array,
2150 * which mainly checks size.
2153 int major = simple_strtoul(buf, &e, 10);
2159 if (!*buf || *e != ':' || !e[1] || e[1] == '\n')
2161 minor = simple_strtoul(e+1, &e, 10);
2162 if (*e && *e != '\n')
2164 dev = MKDEV(major, minor);
2165 if (major != MAJOR(dev) ||
2166 minor != MINOR(dev))
2170 if (mddev->persistent) {
2171 rdev = md_import_device(dev, mddev->major_version,
2172 mddev->minor_version);
2173 if (!IS_ERR(rdev) && !list_empty(&mddev->disks)) {
2174 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
2175 mdk_rdev_t, same_set);
2176 err = super_types[mddev->major_version]
2177 .load_super(rdev, rdev0, mddev->minor_version);
2182 rdev = md_import_device(dev, -1, -1);
2185 return PTR_ERR(rdev);
2186 err = bind_rdev_to_array(rdev, mddev);
2190 return err ? err : len;
2193 static struct md_sysfs_entry md_new_device =
2194 __ATTR(new_dev, 0200, null_show, new_dev_store);
2197 size_show(mddev_t *mddev, char *page)
2199 return sprintf(page, "%llu\n", (unsigned long long)mddev->size);
2202 static int update_size(mddev_t *mddev, unsigned long size);
2205 size_store(mddev_t *mddev, const char *buf, size_t len)
2207 /* If array is inactive, we can reduce the component size, but
2208 * not increase it (except from 0).
2209 * If array is active, we can try an on-line resize
2213 unsigned long long size = simple_strtoull(buf, &e, 10);
2214 if (!*buf || *buf == '\n' ||
2219 err = update_size(mddev, size);
2220 md_update_sb(mddev);
2222 if (mddev->size == 0 ||
2228 return err ? err : len;
2231 static struct md_sysfs_entry md_size =
2232 __ATTR(component_size, 0644, size_show, size_store);
2236 * This is either 'none' for arrays with externally managed metadata,
2237 * or N.M for internally known formats
2240 metadata_show(mddev_t *mddev, char *page)
2242 if (mddev->persistent)
2243 return sprintf(page, "%d.%d\n",
2244 mddev->major_version, mddev->minor_version);
2246 return sprintf(page, "none\n");
2250 metadata_store(mddev_t *mddev, const char *buf, size_t len)
2254 if (!list_empty(&mddev->disks))
2257 if (cmd_match(buf, "none")) {
2258 mddev->persistent = 0;
2259 mddev->major_version = 0;
2260 mddev->minor_version = 90;
2263 major = simple_strtoul(buf, &e, 10);
2264 if (e==buf || *e != '.')
2267 minor = simple_strtoul(buf, &e, 10);
2268 if (e==buf || *e != '\n')
2270 if (major >= sizeof(super_types)/sizeof(super_types[0]) ||
2271 super_types[major].name == NULL)
2273 mddev->major_version = major;
2274 mddev->minor_version = minor;
2275 mddev->persistent = 1;
2279 static struct md_sysfs_entry md_metadata =
2280 __ATTR(metadata_version, 0644, metadata_show, metadata_store);
2283 action_show(mddev_t *mddev, char *page)
2285 char *type = "idle";
2286 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2287 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery)) {
2288 if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
2290 else if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
2291 if (!test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
2293 else if (test_bit(MD_RECOVERY_CHECK, &mddev->recovery))
2300 return sprintf(page, "%s\n", type);
2304 action_store(mddev_t *mddev, const char *page, size_t len)
2306 if (!mddev->pers || !mddev->pers->sync_request)
2309 if (cmd_match(page, "idle")) {
2310 if (mddev->sync_thread) {
2311 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2312 md_unregister_thread(mddev->sync_thread);
2313 mddev->sync_thread = NULL;
2314 mddev->recovery = 0;
2316 } else if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) ||
2317 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery))
2319 else if (cmd_match(page, "resync") || cmd_match(page, "recover"))
2320 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2321 else if (cmd_match(page, "reshape")) {
2323 if (mddev->pers->start_reshape == NULL)
2325 err = mddev->pers->start_reshape(mddev);
2329 if (cmd_match(page, "check"))
2330 set_bit(MD_RECOVERY_CHECK, &mddev->recovery);
2331 else if (!cmd_match(page, "repair"))
2333 set_bit(MD_RECOVERY_REQUESTED, &mddev->recovery);
2334 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
2336 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2337 md_wakeup_thread(mddev->thread);
2342 mismatch_cnt_show(mddev_t *mddev, char *page)
2344 return sprintf(page, "%llu\n",
2345 (unsigned long long) mddev->resync_mismatches);
2348 static struct md_sysfs_entry
2349 md_scan_mode = __ATTR(sync_action, S_IRUGO|S_IWUSR, action_show, action_store);
2352 static struct md_sysfs_entry
2353 md_mismatches = __ATTR_RO(mismatch_cnt);
2356 sync_min_show(mddev_t *mddev, char *page)
2358 return sprintf(page, "%d (%s)\n", speed_min(mddev),
2359 mddev->sync_speed_min ? "local": "system");
2363 sync_min_store(mddev_t *mddev, const char *buf, size_t len)
2367 if (strncmp(buf, "system", 6)==0) {
2368 mddev->sync_speed_min = 0;
2371 min = simple_strtoul(buf, &e, 10);
2372 if (buf == e || (*e && *e != '\n') || min <= 0)
2374 mddev->sync_speed_min = min;
2378 static struct md_sysfs_entry md_sync_min =
2379 __ATTR(sync_speed_min, S_IRUGO|S_IWUSR, sync_min_show, sync_min_store);
2382 sync_max_show(mddev_t *mddev, char *page)
2384 return sprintf(page, "%d (%s)\n", speed_max(mddev),
2385 mddev->sync_speed_max ? "local": "system");
2389 sync_max_store(mddev_t *mddev, const char *buf, size_t len)
2393 if (strncmp(buf, "system", 6)==0) {
2394 mddev->sync_speed_max = 0;
2397 max = simple_strtoul(buf, &e, 10);
2398 if (buf == e || (*e && *e != '\n') || max <= 0)
2400 mddev->sync_speed_max = max;
2404 static struct md_sysfs_entry md_sync_max =
2405 __ATTR(sync_speed_max, S_IRUGO|S_IWUSR, sync_max_show, sync_max_store);
2409 sync_speed_show(mddev_t *mddev, char *page)
2411 unsigned long resync, dt, db;
2412 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2413 dt = ((jiffies - mddev->resync_mark) / HZ);
2415 db = resync - (mddev->resync_mark_cnt);
2416 return sprintf(page, "%ld\n", db/dt/2); /* K/sec */
2419 static struct md_sysfs_entry
2420 md_sync_speed = __ATTR_RO(sync_speed);
2423 sync_completed_show(mddev_t *mddev, char *page)
2425 unsigned long max_blocks, resync;
2427 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
2428 max_blocks = mddev->resync_max_sectors;
2430 max_blocks = mddev->size << 1;
2432 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active));
2433 return sprintf(page, "%lu / %lu\n", resync, max_blocks);
2436 static struct md_sysfs_entry
2437 md_sync_completed = __ATTR_RO(sync_completed);
2440 suspend_lo_show(mddev_t *mddev, char *page)
2442 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_lo);
2446 suspend_lo_store(mddev_t *mddev, const char *buf, size_t len)
2449 unsigned long long new = simple_strtoull(buf, &e, 10);
2451 if (mddev->pers->quiesce == NULL)
2453 if (buf == e || (*e && *e != '\n'))
2455 if (new >= mddev->suspend_hi ||
2456 (new > mddev->suspend_lo && new < mddev->suspend_hi)) {
2457 mddev->suspend_lo = new;
2458 mddev->pers->quiesce(mddev, 2);
2463 static struct md_sysfs_entry md_suspend_lo =
2464 __ATTR(suspend_lo, S_IRUGO|S_IWUSR, suspend_lo_show, suspend_lo_store);
2468 suspend_hi_show(mddev_t *mddev, char *page)
2470 return sprintf(page, "%llu\n", (unsigned long long)mddev->suspend_hi);
2474 suspend_hi_store(mddev_t *mddev, const char *buf, size_t len)
2477 unsigned long long new = simple_strtoull(buf, &e, 10);
2479 if (mddev->pers->quiesce == NULL)
2481 if (buf == e || (*e && *e != '\n'))
2483 if ((new <= mddev->suspend_lo && mddev->suspend_lo >= mddev->suspend_hi) ||
2484 (new > mddev->suspend_lo && new > mddev->suspend_hi)) {
2485 mddev->suspend_hi = new;
2486 mddev->pers->quiesce(mddev, 1);
2487 mddev->pers->quiesce(mddev, 0);
2492 static struct md_sysfs_entry md_suspend_hi =
2493 __ATTR(suspend_hi, S_IRUGO|S_IWUSR, suspend_hi_show, suspend_hi_store);
2496 static struct attribute *md_default_attrs[] = {
2498 &md_raid_disks.attr,
2499 &md_chunk_size.attr,
2502 &md_new_device.attr,
2503 &md_safe_delay.attr,
2507 static struct attribute *md_redundancy_attrs[] = {
2509 &md_mismatches.attr,
2512 &md_sync_speed.attr,
2513 &md_sync_completed.attr,
2514 &md_suspend_lo.attr,
2515 &md_suspend_hi.attr,
2518 static struct attribute_group md_redundancy_group = {
2520 .attrs = md_redundancy_attrs,
2525 md_attr_show(struct kobject *kobj, struct attribute *attr, char *page)
2527 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2528 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2533 rv = mddev_lock(mddev);
2535 rv = entry->show(mddev, page);
2536 mddev_unlock(mddev);
2542 md_attr_store(struct kobject *kobj, struct attribute *attr,
2543 const char *page, size_t length)
2545 struct md_sysfs_entry *entry = container_of(attr, struct md_sysfs_entry, attr);
2546 mddev_t *mddev = container_of(kobj, struct mddev_s, kobj);
2551 rv = mddev_lock(mddev);
2553 rv = entry->store(mddev, page, length);
2554 mddev_unlock(mddev);
2559 static void md_free(struct kobject *ko)
2561 mddev_t *mddev = container_of(ko, mddev_t, kobj);
2565 static struct sysfs_ops md_sysfs_ops = {
2566 .show = md_attr_show,
2567 .store = md_attr_store,
2569 static struct kobj_type md_ktype = {
2571 .sysfs_ops = &md_sysfs_ops,
2572 .default_attrs = md_default_attrs,
2577 static struct kobject *md_probe(dev_t dev, int *part, void *data)
2579 static DEFINE_MUTEX(disks_mutex);
2580 mddev_t *mddev = mddev_find(dev);
2581 struct gendisk *disk;
2582 int partitioned = (MAJOR(dev) != MD_MAJOR);
2583 int shift = partitioned ? MdpMinorShift : 0;
2584 int unit = MINOR(dev) >> shift;
2589 mutex_lock(&disks_mutex);
2590 if (mddev->gendisk) {
2591 mutex_unlock(&disks_mutex);
2595 disk = alloc_disk(1 << shift);
2597 mutex_unlock(&disks_mutex);
2601 disk->major = MAJOR(dev);
2602 disk->first_minor = unit << shift;
2604 sprintf(disk->disk_name, "md_d%d", unit);
2605 sprintf(disk->devfs_name, "md/d%d", unit);
2607 sprintf(disk->disk_name, "md%d", unit);
2608 sprintf(disk->devfs_name, "md/%d", unit);
2610 disk->fops = &md_fops;
2611 disk->private_data = mddev;
2612 disk->queue = mddev->queue;
2614 mddev->gendisk = disk;
2615 mutex_unlock(&disks_mutex);
2616 mddev->kobj.parent = &disk->kobj;
2617 mddev->kobj.k_name = NULL;
2618 snprintf(mddev->kobj.name, KOBJ_NAME_LEN, "%s", "md");
2619 mddev->kobj.ktype = &md_ktype;
2620 kobject_register(&mddev->kobj);
2624 static void md_safemode_timeout(unsigned long data)
2626 mddev_t *mddev = (mddev_t *) data;
2628 mddev->safemode = 1;
2629 md_wakeup_thread(mddev->thread);
2632 static int start_dirty_degraded;
2634 static int do_md_run(mddev_t * mddev)
2638 struct list_head *tmp;
2640 struct gendisk *disk;
2641 struct mdk_personality *pers;
2642 char b[BDEVNAME_SIZE];
2644 if (list_empty(&mddev->disks))
2645 /* cannot run an array with no devices.. */
2652 * Analyze all RAID superblock(s)
2654 if (!mddev->raid_disks)
2657 chunk_size = mddev->chunk_size;
2660 if (chunk_size > MAX_CHUNK_SIZE) {
2661 printk(KERN_ERR "too big chunk_size: %d > %d\n",
2662 chunk_size, MAX_CHUNK_SIZE);
2666 * chunk-size has to be a power of 2 and multiples of PAGE_SIZE
2668 if ( (1 << ffz(~chunk_size)) != chunk_size) {
2669 printk(KERN_ERR "chunk_size of %d not valid\n", chunk_size);
2672 if (chunk_size < PAGE_SIZE) {
2673 printk(KERN_ERR "too small chunk_size: %d < %ld\n",
2674 chunk_size, PAGE_SIZE);
2678 /* devices must have minimum size of one chunk */
2679 ITERATE_RDEV(mddev,rdev,tmp) {
2680 if (test_bit(Faulty, &rdev->flags))
2682 if (rdev->size < chunk_size / 1024) {
2684 "md: Dev %s smaller than chunk_size:"
2686 bdevname(rdev->bdev,b),
2687 (unsigned long long)rdev->size,
2695 if (mddev->level != LEVEL_NONE)
2696 request_module("md-level-%d", mddev->level);
2697 else if (mddev->clevel[0])
2698 request_module("md-%s", mddev->clevel);
2702 * Drop all container device buffers, from now on
2703 * the only valid external interface is through the md
2705 * Also find largest hardsector size
2707 ITERATE_RDEV(mddev,rdev,tmp) {
2708 if (test_bit(Faulty, &rdev->flags))
2710 sync_blockdev(rdev->bdev);
2711 invalidate_bdev(rdev->bdev, 0);
2714 md_probe(mddev->unit, NULL, NULL);
2715 disk = mddev->gendisk;
2719 spin_lock(&pers_lock);
2720 pers = find_pers(mddev->level, mddev->clevel);
2721 if (!pers || !try_module_get(pers->owner)) {
2722 spin_unlock(&pers_lock);
2723 if (mddev->level != LEVEL_NONE)
2724 printk(KERN_WARNING "md: personality for level %d is not loaded!\n",
2727 printk(KERN_WARNING "md: personality for level %s is not loaded!\n",
2732 spin_unlock(&pers_lock);
2733 mddev->level = pers->level;
2734 strlcpy(mddev->clevel, pers->name, sizeof(mddev->clevel));
2736 if (mddev->reshape_position != MaxSector &&
2737 pers->start_reshape == NULL) {
2738 /* This personality cannot handle reshaping... */
2740 module_put(pers->owner);
2744 mddev->recovery = 0;
2745 mddev->resync_max_sectors = mddev->size << 1; /* may be over-ridden by personality */
2746 mddev->barriers_work = 1;
2747 mddev->ok_start_degraded = start_dirty_degraded;
2750 mddev->ro = 2; /* read-only, but switch on first write */
2752 err = mddev->pers->run(mddev);
2753 if (!err && mddev->pers->sync_request) {
2754 err = bitmap_create(mddev);
2756 printk(KERN_ERR "%s: failed to create bitmap (%d)\n",
2757 mdname(mddev), err);
2758 mddev->pers->stop(mddev);
2762 printk(KERN_ERR "md: pers->run() failed ...\n");
2763 module_put(mddev->pers->owner);
2765 bitmap_destroy(mddev);
2768 if (mddev->pers->sync_request)
2769 sysfs_create_group(&mddev->kobj, &md_redundancy_group);
2770 else if (mddev->ro == 2) /* auto-readonly not meaningful */
2773 atomic_set(&mddev->writes_pending,0);
2774 mddev->safemode = 0;
2775 mddev->safemode_timer.function = md_safemode_timeout;
2776 mddev->safemode_timer.data = (unsigned long) mddev;
2777 mddev->safemode_delay = (200 * HZ)/1000 +1; /* 200 msec delay */
2780 ITERATE_RDEV(mddev,rdev,tmp)
2781 if (rdev->raid_disk >= 0) {
2783 sprintf(nm, "rd%d", rdev->raid_disk);
2784 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
2787 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2788 md_wakeup_thread(mddev->thread);
2790 if (mddev->sb_dirty)
2791 md_update_sb(mddev);
2793 set_capacity(disk, mddev->array_size<<1);
2795 /* If we call blk_queue_make_request here, it will
2796 * re-initialise max_sectors etc which may have been
2797 * refined inside -> run. So just set the bits we need to set.
2798 * Most initialisation happended when we called
2799 * blk_queue_make_request(..., md_fail_request)
2802 mddev->queue->queuedata = mddev;
2803 mddev->queue->make_request_fn = mddev->pers->make_request;
2805 /* If there is a partially-recovered drive we need to
2806 * start recovery here. If we leave it to md_check_recovery,
2807 * it will remove the drives and not do the right thing
2809 if (mddev->degraded) {
2810 struct list_head *rtmp;
2812 ITERATE_RDEV(mddev,rdev,rtmp)
2813 if (rdev->raid_disk >= 0 &&
2814 !test_bit(In_sync, &rdev->flags) &&
2815 !test_bit(Faulty, &rdev->flags))
2816 /* complete an interrupted recovery */
2818 if (spares && mddev->pers->sync_request) {
2819 mddev->recovery = 0;
2820 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
2821 mddev->sync_thread = md_register_thread(md_do_sync,
2824 if (!mddev->sync_thread) {
2825 printk(KERN_ERR "%s: could not start resync"
2828 /* leave the spares where they are, it shouldn't hurt */
2829 mddev->recovery = 0;
2831 md_wakeup_thread(mddev->sync_thread);
2836 md_new_event(mddev);
2840 static int restart_array(mddev_t *mddev)
2842 struct gendisk *disk = mddev->gendisk;
2846 * Complain if it has no devices
2849 if (list_empty(&mddev->disks))
2857 mddev->safemode = 0;
2859 set_disk_ro(disk, 0);
2861 printk(KERN_INFO "md: %s switched to read-write mode.\n",
2864 * Kick recovery or resync if necessary
2866 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
2867 md_wakeup_thread(mddev->thread);
2868 md_wakeup_thread(mddev->sync_thread);
2871 printk(KERN_ERR "md: %s has no personality assigned.\n",
2880 /* similar to deny_write_access, but accounts for our holding a reference
2881 * to the file ourselves */
2882 static int deny_bitmap_write_access(struct file * file)
2884 struct inode *inode = file->f_mapping->host;
2886 spin_lock(&inode->i_lock);
2887 if (atomic_read(&inode->i_writecount) > 1) {
2888 spin_unlock(&inode->i_lock);
2891 atomic_set(&inode->i_writecount, -1);
2892 spin_unlock(&inode->i_lock);
2897 static void restore_bitmap_write_access(struct file *file)
2899 struct inode *inode = file->f_mapping->host;
2901 spin_lock(&inode->i_lock);
2902 atomic_set(&inode->i_writecount, 1);
2903 spin_unlock(&inode->i_lock);
2906 static int do_md_stop(mddev_t * mddev, int ro)
2909 struct gendisk *disk = mddev->gendisk;
2912 if (atomic_read(&mddev->active)>2) {
2913 printk("md: %s still in use.\n",mdname(mddev));
2917 if (mddev->sync_thread) {
2918 set_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
2919 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
2920 md_unregister_thread(mddev->sync_thread);
2921 mddev->sync_thread = NULL;
2924 del_timer_sync(&mddev->safemode_timer);
2926 invalidate_partition(disk, 0);
2934 bitmap_flush(mddev);
2935 md_super_wait(mddev);
2937 set_disk_ro(disk, 0);
2938 blk_queue_make_request(mddev->queue, md_fail_request);
2939 mddev->pers->stop(mddev);
2940 if (mddev->pers->sync_request)
2941 sysfs_remove_group(&mddev->kobj, &md_redundancy_group);
2943 module_put(mddev->pers->owner);
2948 if (!mddev->in_sync || mddev->sb_dirty) {
2949 /* mark array as shutdown cleanly */
2951 md_update_sb(mddev);
2954 set_disk_ro(disk, 1);
2955 clear_bit(MD_RECOVERY_FROZEN, &mddev->recovery);
2959 * Free resources if final stop
2963 struct list_head *tmp;
2964 struct gendisk *disk;
2965 printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));
2967 bitmap_destroy(mddev);
2968 if (mddev->bitmap_file) {
2969 restore_bitmap_write_access(mddev->bitmap_file);
2970 fput(mddev->bitmap_file);
2971 mddev->bitmap_file = NULL;
2973 mddev->bitmap_offset = 0;
2975 ITERATE_RDEV(mddev,rdev,tmp)
2976 if (rdev->raid_disk >= 0) {
2978 sprintf(nm, "rd%d", rdev->raid_disk);
2979 sysfs_remove_link(&mddev->kobj, nm);
2982 export_array(mddev);
2984 mddev->array_size = 0;
2985 disk = mddev->gendisk;
2987 set_capacity(disk, 0);
2989 } else if (mddev->pers)
2990 printk(KERN_INFO "md: %s switched to read-only mode.\n",
2993 md_new_event(mddev);
2998 static void autorun_array(mddev_t *mddev)
3001 struct list_head *tmp;
3004 if (list_empty(&mddev->disks))
3007 printk(KERN_INFO "md: running: ");
3009 ITERATE_RDEV(mddev,rdev,tmp) {
3010 char b[BDEVNAME_SIZE];
3011 printk("<%s>", bdevname(rdev->bdev,b));
3015 err = do_md_run (mddev);
3017 printk(KERN_WARNING "md: do_md_run() returned %d\n", err);
3018 do_md_stop (mddev, 0);
3023 * lets try to run arrays based on all disks that have arrived
3024 * until now. (those are in pending_raid_disks)
3026 * the method: pick the first pending disk, collect all disks with
3027 * the same UUID, remove all from the pending list and put them into
3028 * the 'same_array' list. Then order this list based on superblock
3029 * update time (freshest comes first), kick out 'old' disks and
3030 * compare superblocks. If everything's fine then run it.
3032 * If "unit" is allocated, then bump its reference count
3034 static void autorun_devices(int part)
3036 struct list_head *tmp;
3037 mdk_rdev_t *rdev0, *rdev;
3039 char b[BDEVNAME_SIZE];
3041 printk(KERN_INFO "md: autorun ...\n");
3042 while (!list_empty(&pending_raid_disks)) {
3044 LIST_HEAD(candidates);
3045 rdev0 = list_entry(pending_raid_disks.next,
3046 mdk_rdev_t, same_set);
3048 printk(KERN_INFO "md: considering %s ...\n",
3049 bdevname(rdev0->bdev,b));
3050 INIT_LIST_HEAD(&candidates);
3051 ITERATE_RDEV_PENDING(rdev,tmp)
3052 if (super_90_load(rdev, rdev0, 0) >= 0) {
3053 printk(KERN_INFO "md: adding %s ...\n",
3054 bdevname(rdev->bdev,b));
3055 list_move(&rdev->same_set, &candidates);
3058 * now we have a set of devices, with all of them having
3059 * mostly sane superblocks. It's time to allocate the
3062 if (rdev0->preferred_minor < 0 || rdev0->preferred_minor >= MAX_MD_DEVS) {
3063 printk(KERN_INFO "md: unit number in %s is bad: %d\n",
3064 bdevname(rdev0->bdev, b), rdev0->preferred_minor);
3068 dev = MKDEV(mdp_major,
3069 rdev0->preferred_minor << MdpMinorShift);
3071 dev = MKDEV(MD_MAJOR, rdev0->preferred_minor);
3073 md_probe(dev, NULL, NULL);
3074 mddev = mddev_find(dev);
3077 "md: cannot allocate memory for md drive.\n");
3080 if (mddev_lock(mddev))
3081 printk(KERN_WARNING "md: %s locked, cannot run\n",
3083 else if (mddev->raid_disks || mddev->major_version
3084 || !list_empty(&mddev->disks)) {
3086 "md: %s already running, cannot run %s\n",
3087 mdname(mddev), bdevname(rdev0->bdev,b));
3088 mddev_unlock(mddev);
3090 printk(KERN_INFO "md: created %s\n", mdname(mddev));
3091 ITERATE_RDEV_GENERIC(candidates,rdev,tmp) {
3092 list_del_init(&rdev->same_set);
3093 if (bind_rdev_to_array(rdev, mddev))
3096 autorun_array(mddev);
3097 mddev_unlock(mddev);
3099 /* on success, candidates will be empty, on error
3102 ITERATE_RDEV_GENERIC(candidates,rdev,tmp)
3106 printk(KERN_INFO "md: ... autorun DONE.\n");
3110 * import RAID devices based on one partition
3111 * if possible, the array gets run as well.
3114 static int autostart_array(dev_t startdev)
3116 char b[BDEVNAME_SIZE];
3117 int err = -EINVAL, i;
3118 mdp_super_t *sb = NULL;
3119 mdk_rdev_t *start_rdev = NULL, *rdev;
3121 start_rdev = md_import_device(startdev, 0, 0);
3122 if (IS_ERR(start_rdev))
3126 /* NOTE: this can only work for 0.90.0 superblocks */
3127 sb = (mdp_super_t*)page_address(start_rdev->sb_page);
3128 if (sb->major_version != 0 ||
3129 sb->minor_version != 90 ) {
3130 printk(KERN_WARNING "md: can only autostart 0.90.0 arrays\n");
3131 export_rdev(start_rdev);
3135 if (test_bit(Faulty, &start_rdev->flags)) {
3137 "md: can not autostart based on faulty %s!\n",
3138 bdevname(start_rdev->bdev,b));
3139 export_rdev(start_rdev);
3142 list_add(&start_rdev->same_set, &pending_raid_disks);
3144 for (i = 0; i < MD_SB_DISKS; i++) {
3145 mdp_disk_t *desc = sb->disks + i;
3146 dev_t dev = MKDEV(desc->major, desc->minor);
3150 if (dev == startdev)
3152 if (MAJOR(dev) != desc->major || MINOR(dev) != desc->minor)
3154 rdev = md_import_device(dev, 0, 0);
3158 list_add(&rdev->same_set, &pending_raid_disks);
3162 * possibly return codes
3170 static int get_version(void __user * arg)
3174 ver.major = MD_MAJOR_VERSION;
3175 ver.minor = MD_MINOR_VERSION;
3176 ver.patchlevel = MD_PATCHLEVEL_VERSION;
3178 if (copy_to_user(arg, &ver, sizeof(ver)))
3184 static int get_array_info(mddev_t * mddev, void __user * arg)
3186 mdu_array_info_t info;
3187 int nr,working,active,failed,spare;
3189 struct list_head *tmp;
3191 nr=working=active=failed=spare=0;
3192 ITERATE_RDEV(mddev,rdev,tmp) {
3194 if (test_bit(Faulty, &rdev->flags))
3198 if (test_bit(In_sync, &rdev->flags))
3205 info.major_version = mddev->major_version;
3206 info.minor_version = mddev->minor_version;
3207 info.patch_version = MD_PATCHLEVEL_VERSION;
3208 info.ctime = mddev->ctime;
3209 info.level = mddev->level;
3210 info.size = mddev->size;
3211 if (info.size != mddev->size) /* overflow */
3214 info.raid_disks = mddev->raid_disks;
3215 info.md_minor = mddev->md_minor;
3216 info.not_persistent= !mddev->persistent;
3218 info.utime = mddev->utime;
3221 info.state = (1<<MD_SB_CLEAN);
3222 if (mddev->bitmap && mddev->bitmap_offset)
3223 info.state = (1<<MD_SB_BITMAP_PRESENT);
3224 info.active_disks = active;
3225 info.working_disks = working;
3226 info.failed_disks = failed;
3227 info.spare_disks = spare;
3229 info.layout = mddev->layout;
3230 info.chunk_size = mddev->chunk_size;
3232 if (copy_to_user(arg, &info, sizeof(info)))
3238 static int get_bitmap_file(mddev_t * mddev, void __user * arg)
3240 mdu_bitmap_file_t *file = NULL; /* too big for stack allocation */
3241 char *ptr, *buf = NULL;
3244 file = kmalloc(sizeof(*file), GFP_KERNEL);
3248 /* bitmap disabled, zero the first byte and copy out */
3249 if (!mddev->bitmap || !mddev->bitmap->file) {
3250 file->pathname[0] = '\0';
3254 buf = kmalloc(sizeof(file->pathname), GFP_KERNEL);
3258 ptr = file_path(mddev->bitmap->file, buf, sizeof(file->pathname));
3262 strcpy(file->pathname, ptr);
3266 if (copy_to_user(arg, file, sizeof(*file)))
3274 static int get_disk_info(mddev_t * mddev, void __user * arg)
3276 mdu_disk_info_t info;
3280 if (copy_from_user(&info, arg, sizeof(info)))
3285 rdev = find_rdev_nr(mddev, nr);
3287 info.major = MAJOR(rdev->bdev->bd_dev);
3288 info.minor = MINOR(rdev->bdev->bd_dev);
3289 info.raid_disk = rdev->raid_disk;
3291 if (test_bit(Faulty, &rdev->flags))
3292 info.state |= (1<<MD_DISK_FAULTY);
3293 else if (test_bit(In_sync, &rdev->flags)) {
3294 info.state |= (1<<MD_DISK_ACTIVE);
3295 info.state |= (1<<MD_DISK_SYNC);
3297 if (test_bit(WriteMostly, &rdev->flags))
3298 info.state |= (1<<MD_DISK_WRITEMOSTLY);
3300 info.major = info.minor = 0;
3301 info.raid_disk = -1;
3302 info.state = (1<<MD_DISK_REMOVED);
3305 if (copy_to_user(arg, &info, sizeof(info)))
3311 static int add_new_disk(mddev_t * mddev, mdu_disk_info_t *info)
3313 char b[BDEVNAME_SIZE], b2[BDEVNAME_SIZE];
3315 dev_t dev = MKDEV(info->major,info->minor);
3317 if (info->major != MAJOR(dev) || info->minor != MINOR(dev))
3320 if (!mddev->raid_disks) {
3322 /* expecting a device which has a superblock */
3323 rdev = md_import_device(dev, mddev->major_version, mddev->minor_version);
3326 "md: md_import_device returned %ld\n",
3328 return PTR_ERR(rdev);
3330 if (!list_empty(&mddev->disks)) {
3331 mdk_rdev_t *rdev0 = list_entry(mddev->disks.next,
3332 mdk_rdev_t, same_set);
3333 int err = super_types[mddev->major_version]
3334 .load_super(rdev, rdev0, mddev->minor_version);
3337 "md: %s has different UUID to %s\n",
3338 bdevname(rdev->bdev,b),
3339 bdevname(rdev0->bdev,b2));
3344 err = bind_rdev_to_array(rdev, mddev);
3351 * add_new_disk can be used once the array is assembled
3352 * to add "hot spares". They must already have a superblock
3357 if (!mddev->pers->hot_add_disk) {
3359 "%s: personality does not support diskops!\n",
3363 if (mddev->persistent)
3364 rdev = md_import_device(dev, mddev->major_version,
3365 mddev->minor_version);
3367 rdev = md_import_device(dev, -1, -1);
3370 "md: md_import_device returned %ld\n",
3372 return PTR_ERR(rdev);
3374 /* set save_raid_disk if appropriate */
3375 if (!mddev->persistent) {
3376 if (info->state & (1<<MD_DISK_SYNC) &&
3377 info->raid_disk < mddev->raid_disks)
3378 rdev->raid_disk = info->raid_disk;
3380 rdev->raid_disk = -1;
3382 super_types[mddev->major_version].
3383 validate_super(mddev, rdev);
3384 rdev->saved_raid_disk = rdev->raid_disk;
3386 clear_bit(In_sync, &rdev->flags); /* just to be sure */
3387 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3388 set_bit(WriteMostly, &rdev->flags);
3390 rdev->raid_disk = -1;
3391 err = bind_rdev_to_array(rdev, mddev);
3392 if (!err && !mddev->pers->hot_remove_disk) {
3393 /* If there is hot_add_disk but no hot_remove_disk
3394 * then added disks for geometry changes,
3395 * and should be added immediately.
3397 super_types[mddev->major_version].
3398 validate_super(mddev, rdev);
3399 err = mddev->pers->hot_add_disk(mddev, rdev);
3401 unbind_rdev_from_array(rdev);
3406 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3407 md_wakeup_thread(mddev->thread);
3411 /* otherwise, add_new_disk is only allowed
3412 * for major_version==0 superblocks
3414 if (mddev->major_version != 0) {
3415 printk(KERN_WARNING "%s: ADD_NEW_DISK not supported\n",
3420 if (!(info->state & (1<<MD_DISK_FAULTY))) {
3422 rdev = md_import_device (dev, -1, 0);
3425 "md: error, md_import_device() returned %ld\n",
3427 return PTR_ERR(rdev);
3429 rdev->desc_nr = info->number;
3430 if (info->raid_disk < mddev->raid_disks)
3431 rdev->raid_disk = info->raid_disk;
3433 rdev->raid_disk = -1;
3437 if (rdev->raid_disk < mddev->raid_disks)
3438 if (info->state & (1<<MD_DISK_SYNC))
3439 set_bit(In_sync, &rdev->flags);
3441 if (info->state & (1<<MD_DISK_WRITEMOSTLY))
3442 set_bit(WriteMostly, &rdev->flags);
3444 if (!mddev->persistent) {
3445 printk(KERN_INFO "md: nonpersistent superblock ...\n");
3446 rdev->sb_offset = rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3448 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3449 rdev->size = calc_dev_size(rdev, mddev->chunk_size);
3451 err = bind_rdev_to_array(rdev, mddev);
3461 static int hot_remove_disk(mddev_t * mddev, dev_t dev)
3463 char b[BDEVNAME_SIZE];
3469 rdev = find_rdev(mddev, dev);
3473 if (rdev->raid_disk >= 0)
3476 kick_rdev_from_array(rdev);
3477 md_update_sb(mddev);
3478 md_new_event(mddev);
3482 printk(KERN_WARNING "md: cannot remove active disk %s from %s ... \n",
3483 bdevname(rdev->bdev,b), mdname(mddev));
3487 static int hot_add_disk(mddev_t * mddev, dev_t dev)
3489 char b[BDEVNAME_SIZE];
3497 if (mddev->major_version != 0) {
3498 printk(KERN_WARNING "%s: HOT_ADD may only be used with"
3499 " version-0 superblocks.\n",
3503 if (!mddev->pers->hot_add_disk) {
3505 "%s: personality does not support diskops!\n",
3510 rdev = md_import_device (dev, -1, 0);
3513 "md: error, md_import_device() returned %ld\n",
3518 if (mddev->persistent)
3519 rdev->sb_offset = calc_dev_sboffset(rdev->bdev);
3522 rdev->bdev->bd_inode->i_size >> BLOCK_SIZE_BITS;
3524 size = calc_dev_size(rdev, mddev->chunk_size);
3527 if (test_bit(Faulty, &rdev->flags)) {
3529 "md: can not hot-add faulty %s disk to %s!\n",
3530 bdevname(rdev->bdev,b), mdname(mddev));
3534 clear_bit(In_sync, &rdev->flags);
3536 err = bind_rdev_to_array(rdev, mddev);
3541 * The rest should better be atomic, we can have disk failures
3542 * noticed in interrupt contexts ...
3545 if (rdev->desc_nr == mddev->max_disks) {
3546 printk(KERN_WARNING "%s: can not hot-add to full array!\n",
3549 goto abort_unbind_export;
3552 rdev->raid_disk = -1;
3554 md_update_sb(mddev);
3557 * Kick recovery, maybe this spare has to be added to the
3558 * array immediately.
3560 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
3561 md_wakeup_thread(mddev->thread);
3562 md_new_event(mddev);
3565 abort_unbind_export:
3566 unbind_rdev_from_array(rdev);
3573 static int set_bitmap_file(mddev_t *mddev, int fd)
3578 if (!mddev->pers->quiesce)
3580 if (mddev->recovery || mddev->sync_thread)
3582 /* we should be able to change the bitmap.. */
3588 return -EEXIST; /* cannot add when bitmap is present */
3589 mddev->bitmap_file = fget(fd);
3591 if (mddev->bitmap_file == NULL) {
3592 printk(KERN_ERR "%s: error: failed to get bitmap file\n",
3597 err = deny_bitmap_write_access(mddev->bitmap_file);
3599 printk(KERN_ERR "%s: error: bitmap file is already in use\n",
3601 fput(mddev->bitmap_file);
3602 mddev->bitmap_file = NULL;
3605 mddev->bitmap_offset = 0; /* file overrides offset */
3606 } else if (mddev->bitmap == NULL)
3607 return -ENOENT; /* cannot remove what isn't there */
3610 mddev->pers->quiesce(mddev, 1);
3612 err = bitmap_create(mddev);
3613 if (fd < 0 || err) {
3614 bitmap_destroy(mddev);
3615 fd = -1; /* make sure to put the file */
3617 mddev->pers->quiesce(mddev, 0);
3620 if (mddev->bitmap_file) {
3621 restore_bitmap_write_access(mddev->bitmap_file);
3622 fput(mddev->bitmap_file);
3624 mddev->bitmap_file = NULL;
3631 * set_array_info is used two different ways
3632 * The original usage is when creating a new array.
3633 * In this usage, raid_disks is > 0 and it together with
3634 * level, size, not_persistent,layout,chunksize determine the
3635 * shape of the array.
3636 * This will always create an array with a type-0.90.0 superblock.
3637 * The newer usage is when assembling an array.
3638 * In this case raid_disks will be 0, and the major_version field is
3639 * use to determine which style super-blocks are to be found on the devices.
3640 * The minor and patch _version numbers are also kept incase the
3641 * super_block handler wishes to interpret them.
3643 static int set_array_info(mddev_t * mddev, mdu_array_info_t *info)
3646 if (info->raid_disks == 0) {
3647 /* just setting version number for superblock loading */
3648 if (info->major_version < 0 ||
3649 info->major_version >= sizeof(super_types)/sizeof(super_types[0]) ||
3650 super_types[info->major_version].name == NULL) {
3651 /* maybe try to auto-load a module? */
3653 "md: superblock version %d not known\n",
3654 info->major_version);
3657 mddev->major_version = info->major_version;
3658 mddev->minor_version = info->minor_version;
3659 mddev->patch_version = info->patch_version;
3662 mddev->major_version = MD_MAJOR_VERSION;
3663 mddev->minor_version = MD_MINOR_VERSION;
3664 mddev->patch_version = MD_PATCHLEVEL_VERSION;
3665 mddev->ctime = get_seconds();
3667 mddev->level = info->level;
3668 mddev->clevel[0] = 0;
3669 mddev->size = info->size;
3670 mddev->raid_disks = info->raid_disks;
3671 /* don't set md_minor, it is determined by which /dev/md* was
3674 if (info->state & (1<<MD_SB_CLEAN))
3675 mddev->recovery_cp = MaxSector;
3677 mddev->recovery_cp = 0;
3678 mddev->persistent = ! info->not_persistent;
3680 mddev->layout = info->layout;
3681 mddev->chunk_size = info->chunk_size;
3683 mddev->max_disks = MD_SB_DISKS;
3685 mddev->sb_dirty = 1;
3687 mddev->default_bitmap_offset = MD_SB_BYTES >> 9;
3688 mddev->bitmap_offset = 0;
3690 mddev->reshape_position = MaxSector;
3693 * Generate a 128 bit UUID
3695 get_random_bytes(mddev->uuid, 16);
3697 mddev->new_level = mddev->level;
3698 mddev->new_chunk = mddev->chunk_size;
3699 mddev->new_layout = mddev->layout;
3700 mddev->delta_disks = 0;
3705 static int update_size(mddev_t *mddev, unsigned long size)
3709 struct list_head *tmp;
3710 int fit = (size == 0);
3712 if (mddev->pers->resize == NULL)
3714 /* The "size" is the amount of each device that is used.
3715 * This can only make sense for arrays with redundancy.
3716 * linear and raid0 always use whatever space is available
3717 * We can only consider changing the size if no resync
3718 * or reconstruction is happening, and if the new size
3719 * is acceptable. It must fit before the sb_offset or,
3720 * if that is <data_offset, it must fit before the
3721 * size of each device.
3722 * If size is zero, we find the largest size that fits.
3724 if (mddev->sync_thread)
3726 ITERATE_RDEV(mddev,rdev,tmp) {
3728 if (rdev->sb_offset > rdev->data_offset)
3729 avail = (rdev->sb_offset*2) - rdev->data_offset;
3731 avail = get_capacity(rdev->bdev->bd_disk)
3732 - rdev->data_offset;
3733 if (fit && (size == 0 || size > avail/2))
3735 if (avail < ((sector_t)size << 1))
3738 rv = mddev->pers->resize(mddev, (sector_t)size *2);
3740 struct block_device *bdev;
3742 bdev = bdget_disk(mddev->gendisk, 0);
3744 mutex_lock(&bdev->bd_inode->i_mutex);
3745 i_size_write(bdev->bd_inode, (loff_t)mddev->array_size << 10);
3746 mutex_unlock(&bdev->bd_inode->i_mutex);
3753 static int update_raid_disks(mddev_t *mddev, int raid_disks)
3756 /* change the number of raid disks */
3757 if (mddev->pers->check_reshape == NULL)
3759 if (raid_disks <= 0 ||
3760 raid_disks >= mddev->max_disks)
3762 if (mddev->sync_thread || mddev->reshape_position != MaxSector)
3764 mddev->delta_disks = raid_disks - mddev->raid_disks;
3766 rv = mddev->pers->check_reshape(mddev);
3772 * update_array_info is used to change the configuration of an
3774 * The version, ctime,level,size,raid_disks,not_persistent, layout,chunk_size
3775 * fields in the info are checked against the array.
3776 * Any differences that cannot be handled will cause an error.
3777 * Normally, only one change can be managed at a time.
3779 static int update_array_info(mddev_t *mddev, mdu_array_info_t *info)
3785 /* calculate expected state,ignoring low bits */
3786 if (mddev->bitmap && mddev->bitmap_offset)
3787 state |= (1 << MD_SB_BITMAP_PRESENT);
3789 if (mddev->major_version != info->major_version ||
3790 mddev->minor_version != info->minor_version ||
3791 /* mddev->patch_version != info->patch_version || */
3792 mddev->ctime != info->ctime ||
3793 mddev->level != info->level ||
3794 /* mddev->layout != info->layout || */
3795 !mddev->persistent != info->not_persistent||
3796 mddev->chunk_size != info->chunk_size ||
3797 /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */
3798 ((state^info->state) & 0xfffffe00)
3801 /* Check there is only one change */
3802 if (info->size >= 0 && mddev->size != info->size) cnt++;
3803 if (mddev->raid_disks != info->raid_disks) cnt++;
3804 if (mddev->layout != info->layout) cnt++;
3805 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) cnt++;
3806 if (cnt == 0) return 0;
3807 if (cnt > 1) return -EINVAL;
3809 if (mddev->layout != info->layout) {
3811 * we don't need to do anything at the md level, the
3812 * personality will take care of it all.
3814 if (mddev->pers->reconfig == NULL)
3817 return mddev->pers->reconfig(mddev, info->layout, -1);
3819 if (info->size >= 0 && mddev->size != info->size)
3820 rv = update_size(mddev, info->size);
3822 if (mddev->raid_disks != info->raid_disks)
3823 rv = update_raid_disks(mddev, info->raid_disks);
3825 if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
3826 if (mddev->pers->quiesce == NULL)
3828 if (mddev->recovery || mddev->sync_thread)
3830 if (info->state & (1<<MD_SB_BITMAP_PRESENT)) {
3831 /* add the bitmap */
3834 if (mddev->default_bitmap_offset == 0)
3836 mddev->bitmap_offset = mddev->default_bitmap_offset;
3837 mddev->pers->quiesce(mddev, 1);
3838 rv = bitmap_create(mddev);
3840 bitmap_destroy(mddev);
3841 mddev->pers->quiesce(mddev, 0);
3843 /* remove the bitmap */
3846 if (mddev->bitmap->file)
3848 mddev->pers->quiesce(mddev, 1);
3849 bitmap_destroy(mddev);
3850 mddev->pers->quiesce(mddev, 0);
3851 mddev->bitmap_offset = 0;
3854 md_update_sb(mddev);
3858 static int set_disk_faulty(mddev_t *mddev, dev_t dev)
3862 if (mddev->pers == NULL)
3865 rdev = find_rdev(mddev, dev);
3869 md_error(mddev, rdev);
3873 static int md_getgeo(struct block_device *bdev, struct hd_geometry *geo)
3875 mddev_t *mddev = bdev->bd_disk->private_data;
3879 geo->cylinders = get_capacity(mddev->gendisk) / 8;
3883 static int md_ioctl(struct inode *inode, struct file *file,
3884 unsigned int cmd, unsigned long arg)
3887 void __user *argp = (void __user *)arg;
3888 mddev_t *mddev = NULL;
3890 if (!capable(CAP_SYS_ADMIN))
3894 * Commands dealing with the RAID driver but not any
3900 err = get_version(argp);
3903 case PRINT_RAID_DEBUG:
3911 autostart_arrays(arg);
3918 * Commands creating/starting a new array:
3921 mddev = inode->i_bdev->bd_disk->private_data;
3929 if (cmd == START_ARRAY) {
3930 /* START_ARRAY doesn't need to lock the array as autostart_array
3931 * does the locking, and it could even be a different array
3936 "md: %s(pid %d) used deprecated START_ARRAY ioctl. "
3937 "This will not be supported beyond July 2006\n",
3938 current->comm, current->pid);
3941 err = autostart_array(new_decode_dev(arg));
3943 printk(KERN_WARNING "md: autostart failed!\n");
3949 err = mddev_lock(mddev);
3952 "md: ioctl lock interrupted, reason %d, cmd %d\n",
3959 case SET_ARRAY_INFO:
3961 mdu_array_info_t info;
3963 memset(&info, 0, sizeof(info));
3964 else if (copy_from_user(&info, argp, sizeof(info))) {
3969 err = update_array_info(mddev, &info);
3971 printk(KERN_WARNING "md: couldn't update"
3972 " array info. %d\n", err);
3977 if (!list_empty(&mddev->disks)) {
3979 "md: array %s already has disks!\n",
3984 if (mddev->raid_disks) {
3986 "md: array %s already initialised!\n",
3991 err = set_array_info(mddev, &info);
3993 printk(KERN_WARNING "md: couldn't set"
3994 " array info. %d\n", err);
4004 * Commands querying/configuring an existing array:
4006 /* if we are not initialised yet, only ADD_NEW_DISK, STOP_ARRAY,
4007 * RUN_ARRAY, and SET_BITMAP_FILE are allowed */
4008 if (!mddev->raid_disks && cmd != ADD_NEW_DISK && cmd != STOP_ARRAY
4009 && cmd != RUN_ARRAY && cmd != SET_BITMAP_FILE) {
4015 * Commands even a read-only array can execute:
4019 case GET_ARRAY_INFO:
4020 err = get_array_info(mddev, argp);
4023 case GET_BITMAP_FILE:
4024 err = get_bitmap_file(mddev, argp);
4028 err = get_disk_info(mddev, argp);
4031 case RESTART_ARRAY_RW:
4032 err = restart_array(mddev);
4036 err = do_md_stop (mddev, 0);
4040 err = do_md_stop (mddev, 1);
4044 * We have a problem here : there is no easy way to give a CHS
4045 * virtual geometry. We currently pretend that we have a 2 heads
4046 * 4 sectors (with a BIG number of cylinders...). This drives
4047 * dosfs just mad... ;-)
4052 * The remaining ioctls are changing the state of the
4053 * superblock, so we do not allow them on read-only arrays.
4054 * However non-MD ioctls (e.g. get-size) will still come through
4055 * here and hit the 'default' below, so only disallow
4056 * 'md' ioctls, and switch to rw mode if started auto-readonly.
4058 if (_IOC_TYPE(cmd) == MD_MAJOR &&
4059 mddev->ro && mddev->pers) {
4060 if (mddev->ro == 2) {
4062 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4063 md_wakeup_thread(mddev->thread);
4075 mdu_disk_info_t info;
4076 if (copy_from_user(&info, argp, sizeof(info)))
4079 err = add_new_disk(mddev, &info);
4083 case HOT_REMOVE_DISK:
4084 err = hot_remove_disk(mddev, new_decode_dev(arg));
4088 err = hot_add_disk(mddev, new_decode_dev(arg));
4091 case SET_DISK_FAULTY:
4092 err = set_disk_faulty(mddev, new_decode_dev(arg));
4096 err = do_md_run (mddev);
4099 case SET_BITMAP_FILE:
4100 err = set_bitmap_file(mddev, (int)arg);
4110 mddev_unlock(mddev);
4120 static int md_open(struct inode *inode, struct file *file)
4123 * Succeed if we can lock the mddev, which confirms that
4124 * it isn't being stopped right now.
4126 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4129 if ((err = mddev_lock(mddev)))
4134 mddev_unlock(mddev);
4136 check_disk_change(inode->i_bdev);
4141 static int md_release(struct inode *inode, struct file * file)
4143 mddev_t *mddev = inode->i_bdev->bd_disk->private_data;
4152 static int md_media_changed(struct gendisk *disk)
4154 mddev_t *mddev = disk->private_data;
4156 return mddev->changed;
4159 static int md_revalidate(struct gendisk *disk)
4161 mddev_t *mddev = disk->private_data;
4166 static struct block_device_operations md_fops =
4168 .owner = THIS_MODULE,
4170 .release = md_release,
4172 .getgeo = md_getgeo,
4173 .media_changed = md_media_changed,
4174 .revalidate_disk= md_revalidate,
4177 static int md_thread(void * arg)
4179 mdk_thread_t *thread = arg;
4182 * md_thread is a 'system-thread', it's priority should be very
4183 * high. We avoid resource deadlocks individually in each
4184 * raid personality. (RAID5 does preallocation) We also use RR and
4185 * the very same RT priority as kswapd, thus we will never get
4186 * into a priority inversion deadlock.
4188 * we definitely have to have equal or higher priority than
4189 * bdflush, otherwise bdflush will deadlock if there are too
4190 * many dirty RAID5 blocks.
4193 allow_signal(SIGKILL);
4194 while (!kthread_should_stop()) {
4196 /* We need to wait INTERRUPTIBLE so that
4197 * we don't add to the load-average.
4198 * That means we need to be sure no signals are
4201 if (signal_pending(current))
4202 flush_signals(current);
4204 wait_event_interruptible_timeout
4206 test_bit(THREAD_WAKEUP, &thread->flags)
4207 || kthread_should_stop(),
4211 clear_bit(THREAD_WAKEUP, &thread->flags);
4213 thread->run(thread->mddev);
4219 void md_wakeup_thread(mdk_thread_t *thread)
4222 dprintk("md: waking up MD thread %s.\n", thread->tsk->comm);
4223 set_bit(THREAD_WAKEUP, &thread->flags);
4224 wake_up(&thread->wqueue);
4228 mdk_thread_t *md_register_thread(void (*run) (mddev_t *), mddev_t *mddev,
4231 mdk_thread_t *thread;
4233 thread = kzalloc(sizeof(mdk_thread_t), GFP_KERNEL);
4237 init_waitqueue_head(&thread->wqueue);
4240 thread->mddev = mddev;
4241 thread->timeout = MAX_SCHEDULE_TIMEOUT;
4242 thread->tsk = kthread_run(md_thread, thread, name, mdname(thread->mddev));
4243 if (IS_ERR(thread->tsk)) {
4250 void md_unregister_thread(mdk_thread_t *thread)
4252 dprintk("interrupting MD-thread pid %d\n", thread->tsk->pid);
4254 kthread_stop(thread->tsk);
4258 void md_error(mddev_t *mddev, mdk_rdev_t *rdev)
4265 if (!rdev || test_bit(Faulty, &rdev->flags))
4268 dprintk("md_error dev:%s, rdev:(%d:%d), (caller: %p,%p,%p,%p).\n",
4270 MAJOR(rdev->bdev->bd_dev), MINOR(rdev->bdev->bd_dev),
4271 __builtin_return_address(0),__builtin_return_address(1),
4272 __builtin_return_address(2),__builtin_return_address(3));
4274 if (!mddev->pers->error_handler)
4276 mddev->pers->error_handler(mddev,rdev);
4277 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4278 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4279 md_wakeup_thread(mddev->thread);
4280 md_new_event_inintr(mddev);
4283 /* seq_file implementation /proc/mdstat */
4285 static void status_unused(struct seq_file *seq)
4289 struct list_head *tmp;
4291 seq_printf(seq, "unused devices: ");
4293 ITERATE_RDEV_PENDING(rdev,tmp) {
4294 char b[BDEVNAME_SIZE];
4296 seq_printf(seq, "%s ",
4297 bdevname(rdev->bdev,b));
4300 seq_printf(seq, "<none>");
4302 seq_printf(seq, "\n");
4306 static void status_resync(struct seq_file *seq, mddev_t * mddev)
4308 sector_t max_blocks, resync, res;
4309 unsigned long dt, db, rt;
4311 unsigned int per_milli;
4313 resync = (mddev->curr_resync - atomic_read(&mddev->recovery_active))/2;
4315 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
4316 max_blocks = mddev->resync_max_sectors >> 1;
4318 max_blocks = mddev->size;
4321 * Should not happen.
4327 /* Pick 'scale' such that (resync>>scale)*1000 will fit
4328 * in a sector_t, and (max_blocks>>scale) will fit in a
4329 * u32, as those are the requirements for sector_div.
4330 * Thus 'scale' must be at least 10
4333 if (sizeof(sector_t) > sizeof(unsigned long)) {
4334 while ( max_blocks/2 > (1ULL<<(scale+32)))
4337 res = (resync>>scale)*1000;
4338 sector_div(res, (u32)((max_blocks>>scale)+1));
4342 int i, x = per_milli/50, y = 20-x;
4343 seq_printf(seq, "[");
4344 for (i = 0; i < x; i++)
4345 seq_printf(seq, "=");
4346 seq_printf(seq, ">");
4347 for (i = 0; i < y; i++)
4348 seq_printf(seq, ".");
4349 seq_printf(seq, "] ");
4351 seq_printf(seq, " %s =%3u.%u%% (%llu/%llu)",
4352 (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery)?
4354 (test_bit(MD_RECOVERY_SYNC, &mddev->recovery) ?
4355 "resync" : "recovery")),
4356 per_milli/10, per_milli % 10,
4357 (unsigned long long) resync,
4358 (unsigned long long) max_blocks);
4361 * We do not want to overflow, so the order of operands and
4362 * the * 100 / 100 trick are important. We do a +1 to be
4363 * safe against division by zero. We only estimate anyway.
4365 * dt: time from mark until now
4366 * db: blocks written from mark until now
4367 * rt: remaining time
4369 dt = ((jiffies - mddev->resync_mark) / HZ);
4371 db = resync - (mddev->resync_mark_cnt/2);
4372 rt = (dt * ((unsigned long)(max_blocks-resync) / (db/100+1)))/100;
4374 seq_printf(seq, " finish=%lu.%lumin", rt / 60, (rt % 60)/6);
4376 seq_printf(seq, " speed=%ldK/sec", db/dt);
4379 static void *md_seq_start(struct seq_file *seq, loff_t *pos)
4381 struct list_head *tmp;
4391 spin_lock(&all_mddevs_lock);
4392 list_for_each(tmp,&all_mddevs)
4394 mddev = list_entry(tmp, mddev_t, all_mddevs);
4396 spin_unlock(&all_mddevs_lock);
4399 spin_unlock(&all_mddevs_lock);
4401 return (void*)2;/* tail */
4405 static void *md_seq_next(struct seq_file *seq, void *v, loff_t *pos)
4407 struct list_head *tmp;
4408 mddev_t *next_mddev, *mddev = v;
4414 spin_lock(&all_mddevs_lock);
4416 tmp = all_mddevs.next;
4418 tmp = mddev->all_mddevs.next;
4419 if (tmp != &all_mddevs)
4420 next_mddev = mddev_get(list_entry(tmp,mddev_t,all_mddevs));
4422 next_mddev = (void*)2;
4425 spin_unlock(&all_mddevs_lock);
4433 static void md_seq_stop(struct seq_file *seq, void *v)
4437 if (mddev && v != (void*)1 && v != (void*)2)
4441 struct mdstat_info {
4445 static int md_seq_show(struct seq_file *seq, void *v)
4449 struct list_head *tmp2;
4451 struct mdstat_info *mi = seq->private;
4452 struct bitmap *bitmap;
4454 if (v == (void*)1) {
4455 struct mdk_personality *pers;
4456 seq_printf(seq, "Personalities : ");
4457 spin_lock(&pers_lock);
4458 list_for_each_entry(pers, &pers_list, list)
4459 seq_printf(seq, "[%s] ", pers->name);
4461 spin_unlock(&pers_lock);
4462 seq_printf(seq, "\n");
4463 mi->event = atomic_read(&md_event_count);
4466 if (v == (void*)2) {
4471 if (mddev_lock(mddev) < 0)
4474 if (mddev->pers || mddev->raid_disks || !list_empty(&mddev->disks)) {
4475 seq_printf(seq, "%s : %sactive", mdname(mddev),
4476 mddev->pers ? "" : "in");
4479 seq_printf(seq, " (read-only)");
4481 seq_printf(seq, "(auto-read-only)");
4482 seq_printf(seq, " %s", mddev->pers->name);
4486 ITERATE_RDEV(mddev,rdev,tmp2) {
4487 char b[BDEVNAME_SIZE];
4488 seq_printf(seq, " %s[%d]",
4489 bdevname(rdev->bdev,b), rdev->desc_nr);
4490 if (test_bit(WriteMostly, &rdev->flags))
4491 seq_printf(seq, "(W)");
4492 if (test_bit(Faulty, &rdev->flags)) {
4493 seq_printf(seq, "(F)");
4495 } else if (rdev->raid_disk < 0)
4496 seq_printf(seq, "(S)"); /* spare */
4500 if (!list_empty(&mddev->disks)) {
4502 seq_printf(seq, "\n %llu blocks",
4503 (unsigned long long)mddev->array_size);
4505 seq_printf(seq, "\n %llu blocks",
4506 (unsigned long long)size);
4508 if (mddev->persistent) {
4509 if (mddev->major_version != 0 ||
4510 mddev->minor_version != 90) {
4511 seq_printf(seq," super %d.%d",
4512 mddev->major_version,
4513 mddev->minor_version);
4516 seq_printf(seq, " super non-persistent");
4519 mddev->pers->status (seq, mddev);
4520 seq_printf(seq, "\n ");
4521 if (mddev->pers->sync_request) {
4522 if (mddev->curr_resync > 2) {
4523 status_resync (seq, mddev);
4524 seq_printf(seq, "\n ");
4525 } else if (mddev->curr_resync == 1 || mddev->curr_resync == 2)
4526 seq_printf(seq, "\tresync=DELAYED\n ");
4527 else if (mddev->recovery_cp < MaxSector)
4528 seq_printf(seq, "\tresync=PENDING\n ");
4531 seq_printf(seq, "\n ");
4533 if ((bitmap = mddev->bitmap)) {
4534 unsigned long chunk_kb;
4535 unsigned long flags;
4536 spin_lock_irqsave(&bitmap->lock, flags);
4537 chunk_kb = bitmap->chunksize >> 10;
4538 seq_printf(seq, "bitmap: %lu/%lu pages [%luKB], "
4540 bitmap->pages - bitmap->missing_pages,
4542 (bitmap->pages - bitmap->missing_pages)
4543 << (PAGE_SHIFT - 10),
4544 chunk_kb ? chunk_kb : bitmap->chunksize,
4545 chunk_kb ? "KB" : "B");
4547 seq_printf(seq, ", file: ");
4548 seq_path(seq, bitmap->file->f_vfsmnt,
4549 bitmap->file->f_dentry," \t\n");
4552 seq_printf(seq, "\n");
4553 spin_unlock_irqrestore(&bitmap->lock, flags);
4556 seq_printf(seq, "\n");
4558 mddev_unlock(mddev);
4563 static struct seq_operations md_seq_ops = {
4564 .start = md_seq_start,
4565 .next = md_seq_next,
4566 .stop = md_seq_stop,
4567 .show = md_seq_show,
4570 static int md_seq_open(struct inode *inode, struct file *file)
4573 struct mdstat_info *mi = kmalloc(sizeof(*mi), GFP_KERNEL);
4577 error = seq_open(file, &md_seq_ops);
4581 struct seq_file *p = file->private_data;
4583 mi->event = atomic_read(&md_event_count);
4588 static int md_seq_release(struct inode *inode, struct file *file)
4590 struct seq_file *m = file->private_data;
4591 struct mdstat_info *mi = m->private;
4594 return seq_release(inode, file);
4597 static unsigned int mdstat_poll(struct file *filp, poll_table *wait)
4599 struct seq_file *m = filp->private_data;
4600 struct mdstat_info *mi = m->private;
4603 poll_wait(filp, &md_event_waiters, wait);
4605 /* always allow read */
4606 mask = POLLIN | POLLRDNORM;
4608 if (mi->event != atomic_read(&md_event_count))
4609 mask |= POLLERR | POLLPRI;
4613 static struct file_operations md_seq_fops = {
4614 .open = md_seq_open,
4616 .llseek = seq_lseek,
4617 .release = md_seq_release,
4618 .poll = mdstat_poll,
4621 int register_md_personality(struct mdk_personality *p)
4623 spin_lock(&pers_lock);
4624 list_add_tail(&p->list, &pers_list);
4625 printk(KERN_INFO "md: %s personality registered for level %d\n", p->name, p->level);
4626 spin_unlock(&pers_lock);
4630 int unregister_md_personality(struct mdk_personality *p)
4632 printk(KERN_INFO "md: %s personality unregistered\n", p->name);
4633 spin_lock(&pers_lock);
4634 list_del_init(&p->list);
4635 spin_unlock(&pers_lock);
4639 static int is_mddev_idle(mddev_t *mddev)
4642 struct list_head *tmp;
4644 unsigned long curr_events;
4647 ITERATE_RDEV(mddev,rdev,tmp) {
4648 struct gendisk *disk = rdev->bdev->bd_contains->bd_disk;
4649 curr_events = disk_stat_read(disk, sectors[0]) +
4650 disk_stat_read(disk, sectors[1]) -
4651 atomic_read(&disk->sync_io);
4652 /* The difference between curr_events and last_events
4653 * will be affected by any new non-sync IO (making
4654 * curr_events bigger) and any difference in the amount of
4655 * in-flight syncio (making current_events bigger or smaller)
4656 * The amount in-flight is currently limited to
4657 * 32*64K in raid1/10 and 256*PAGE_SIZE in raid5/6
4658 * which is at most 4096 sectors.
4659 * These numbers are fairly fragile and should be made
4660 * more robust, probably by enforcing the
4661 * 'window size' that md_do_sync sort-of uses.
4663 * Note: the following is an unsigned comparison.
4665 if ((curr_events - rdev->last_events + 4096) > 8192) {
4666 rdev->last_events = curr_events;
4673 void md_done_sync(mddev_t *mddev, int blocks, int ok)
4675 /* another "blocks" (512byte) blocks have been synced */
4676 atomic_sub(blocks, &mddev->recovery_active);
4677 wake_up(&mddev->recovery_wait);
4679 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4680 md_wakeup_thread(mddev->thread);
4681 // stop recovery, signal do_sync ....
4686 /* md_write_start(mddev, bi)
4687 * If we need to update some array metadata (e.g. 'active' flag
4688 * in superblock) before writing, schedule a superblock update
4689 * and wait for it to complete.
4691 void md_write_start(mddev_t *mddev, struct bio *bi)
4693 if (bio_data_dir(bi) != WRITE)
4696 BUG_ON(mddev->ro == 1);
4697 if (mddev->ro == 2) {
4698 /* need to switch to read/write */
4700 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
4701 md_wakeup_thread(mddev->thread);
4703 atomic_inc(&mddev->writes_pending);
4704 if (mddev->in_sync) {
4705 spin_lock_irq(&mddev->write_lock);
4706 if (mddev->in_sync) {
4708 mddev->sb_dirty = 1;
4709 md_wakeup_thread(mddev->thread);
4711 spin_unlock_irq(&mddev->write_lock);
4713 wait_event(mddev->sb_wait, mddev->sb_dirty==0);
4716 void md_write_end(mddev_t *mddev)
4718 if (atomic_dec_and_test(&mddev->writes_pending)) {
4719 if (mddev->safemode == 2)
4720 md_wakeup_thread(mddev->thread);
4721 else if (mddev->safemode_delay)
4722 mod_timer(&mddev->safemode_timer, jiffies + mddev->safemode_delay);
4726 static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
4728 #define SYNC_MARKS 10
4729 #define SYNC_MARK_STEP (3*HZ)
4730 void md_do_sync(mddev_t *mddev)
4733 unsigned int currspeed = 0,
4735 sector_t max_sectors,j, io_sectors;
4736 unsigned long mark[SYNC_MARKS];
4737 sector_t mark_cnt[SYNC_MARKS];
4739 struct list_head *tmp;
4740 sector_t last_check;
4742 struct list_head *rtmp;
4745 /* just incase thread restarts... */
4746 if (test_bit(MD_RECOVERY_DONE, &mddev->recovery))
4748 if (mddev->ro) /* never try to sync a read-only array */
4751 /* we overload curr_resync somewhat here.
4752 * 0 == not engaged in resync at all
4753 * 2 == checking that there is no conflict with another sync
4754 * 1 == like 2, but have yielded to allow conflicting resync to
4756 * other == active in resync - this many blocks
4758 * Before starting a resync we must have set curr_resync to
4759 * 2, and then checked that every "conflicting" array has curr_resync
4760 * less than ours. When we find one that is the same or higher
4761 * we wait on resync_wait. To avoid deadlock, we reduce curr_resync
4762 * to 1 if we choose to yield (based arbitrarily on address of mddev structure).
4763 * This will mean we have to start checking from the beginning again.
4768 mddev->curr_resync = 2;
4771 if (kthread_should_stop()) {
4772 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4775 ITERATE_MDDEV(mddev2,tmp) {
4776 if (mddev2 == mddev)
4778 if (mddev2->curr_resync &&
4779 match_mddev_units(mddev,mddev2)) {
4781 if (mddev < mddev2 && mddev->curr_resync == 2) {
4782 /* arbitrarily yield */
4783 mddev->curr_resync = 1;
4784 wake_up(&resync_wait);
4786 if (mddev > mddev2 && mddev->curr_resync == 1)
4787 /* no need to wait here, we can wait the next
4788 * time 'round when curr_resync == 2
4791 prepare_to_wait(&resync_wait, &wq, TASK_UNINTERRUPTIBLE);
4792 if (!kthread_should_stop() &&
4793 mddev2->curr_resync >= mddev->curr_resync) {
4794 printk(KERN_INFO "md: delaying resync of %s"
4795 " until %s has finished resync (they"
4796 " share one or more physical units)\n",
4797 mdname(mddev), mdname(mddev2));
4800 finish_wait(&resync_wait, &wq);
4803 finish_wait(&resync_wait, &wq);
4806 } while (mddev->curr_resync < 2);
4809 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4810 /* resync follows the size requested by the personality,
4811 * which defaults to physical size, but can be virtual size
4813 max_sectors = mddev->resync_max_sectors;
4814 mddev->resync_mismatches = 0;
4815 /* we don't use the checkpoint if there's a bitmap */
4816 if (!mddev->bitmap &&
4817 !test_bit(MD_RECOVERY_REQUESTED, &mddev->recovery))
4818 j = mddev->recovery_cp;
4819 } else if (test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery))
4820 max_sectors = mddev->size << 1;
4822 /* recovery follows the physical size of devices */
4823 max_sectors = mddev->size << 1;
4825 ITERATE_RDEV(mddev,rdev,rtmp)
4826 if (rdev->raid_disk >= 0 &&
4827 !test_bit(Faulty, &rdev->flags) &&
4828 !test_bit(In_sync, &rdev->flags) &&
4829 rdev->recovery_offset < j)
4830 j = rdev->recovery_offset;
4833 printk(KERN_INFO "md: syncing RAID array %s\n", mdname(mddev));
4834 printk(KERN_INFO "md: minimum _guaranteed_ reconstruction speed:"
4835 " %d KB/sec/disc.\n", speed_min(mddev));
4836 printk(KERN_INFO "md: using maximum available idle IO bandwidth "
4837 "(but not more than %d KB/sec) for reconstruction.\n",
4840 is_mddev_idle(mddev); /* this also initializes IO event counters */
4843 for (m = 0; m < SYNC_MARKS; m++) {
4845 mark_cnt[m] = io_sectors;
4848 mddev->resync_mark = mark[last_mark];
4849 mddev->resync_mark_cnt = mark_cnt[last_mark];
4852 * Tune reconstruction:
4854 window = 32*(PAGE_SIZE/512);
4855 printk(KERN_INFO "md: using %dk window, over a total of %llu blocks.\n",
4856 window/2,(unsigned long long) max_sectors/2);
4858 atomic_set(&mddev->recovery_active, 0);
4859 init_waitqueue_head(&mddev->recovery_wait);
4864 "md: resuming recovery of %s from checkpoint.\n",
4866 mddev->curr_resync = j;
4869 while (j < max_sectors) {
4873 sectors = mddev->pers->sync_request(mddev, j, &skipped,
4874 currspeed < speed_min(mddev));
4876 set_bit(MD_RECOVERY_ERR, &mddev->recovery);
4880 if (!skipped) { /* actual IO requested */
4881 io_sectors += sectors;
4882 atomic_add(sectors, &mddev->recovery_active);
4886 if (j>1) mddev->curr_resync = j;
4887 if (last_check == 0)
4888 /* this is the earliers that rebuilt will be
4889 * visible in /proc/mdstat
4891 md_new_event(mddev);
4893 if (last_check + window > io_sectors || j == max_sectors)
4896 last_check = io_sectors;
4898 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery) ||
4899 test_bit(MD_RECOVERY_ERR, &mddev->recovery))
4903 if (time_after_eq(jiffies, mark[last_mark] + SYNC_MARK_STEP )) {
4905 int next = (last_mark+1) % SYNC_MARKS;
4907 mddev->resync_mark = mark[next];
4908 mddev->resync_mark_cnt = mark_cnt[next];
4909 mark[next] = jiffies;
4910 mark_cnt[next] = io_sectors - atomic_read(&mddev->recovery_active);
4915 if (kthread_should_stop()) {
4917 * got a signal, exit.
4920 "md: md_do_sync() got signal ... exiting\n");
4921 set_bit(MD_RECOVERY_INTR, &mddev->recovery);
4926 * this loop exits only if either when we are slower than
4927 * the 'hard' speed limit, or the system was IO-idle for
4929 * the system might be non-idle CPU-wise, but we only care
4930 * about not overloading the IO subsystem. (things like an
4931 * e2fsck being done on the RAID array should execute fast)
4933 mddev->queue->unplug_fn(mddev->queue);
4936 currspeed = ((unsigned long)(io_sectors-mddev->resync_mark_cnt))/2
4937 /((jiffies-mddev->resync_mark)/HZ +1) +1;
4939 if (currspeed > speed_min(mddev)) {
4940 if ((currspeed > speed_max(mddev)) ||
4941 !is_mddev_idle(mddev)) {
4947 printk(KERN_INFO "md: %s: sync done.\n",mdname(mddev));
4949 * this also signals 'finished resyncing' to md_stop
4952 mddev->queue->unplug_fn(mddev->queue);
4954 wait_event(mddev->recovery_wait, !atomic_read(&mddev->recovery_active));
4956 /* tell personality that we are finished */
4957 mddev->pers->sync_request(mddev, max_sectors, &skipped, 1);
4959 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
4960 test_bit(MD_RECOVERY_SYNC, &mddev->recovery) &&
4961 !test_bit(MD_RECOVERY_CHECK, &mddev->recovery) &&
4962 mddev->curr_resync > 2) {
4963 if (test_bit(MD_RECOVERY_SYNC, &mddev->recovery)) {
4964 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
4965 if (mddev->curr_resync >= mddev->recovery_cp) {
4967 "md: checkpointing recovery of %s.\n",
4969 mddev->recovery_cp = mddev->curr_resync;
4972 mddev->recovery_cp = MaxSector;
4974 if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
4975 mddev->curr_resync = MaxSector;
4976 ITERATE_RDEV(mddev,rdev,rtmp)
4977 if (rdev->raid_disk >= 0 &&
4978 !test_bit(Faulty, &rdev->flags) &&
4979 !test_bit(In_sync, &rdev->flags) &&
4980 rdev->recovery_offset < mddev->curr_resync)
4981 rdev->recovery_offset = mddev->curr_resync;
4982 mddev->sb_dirty = 1;
4987 mddev->curr_resync = 0;
4988 wake_up(&resync_wait);
4989 set_bit(MD_RECOVERY_DONE, &mddev->recovery);
4990 md_wakeup_thread(mddev->thread);
4992 EXPORT_SYMBOL_GPL(md_do_sync);
4996 * This routine is regularly called by all per-raid-array threads to
4997 * deal with generic issues like resync and super-block update.
4998 * Raid personalities that don't have a thread (linear/raid0) do not
4999 * need this as they never do any recovery or update the superblock.
5001 * It does not do any resync itself, but rather "forks" off other threads
5002 * to do that as needed.
5003 * When it is determined that resync is needed, we set MD_RECOVERY_RUNNING in
5004 * "->recovery" and create a thread at ->sync_thread.
5005 * When the thread finishes it sets MD_RECOVERY_DONE (and might set MD_RECOVERY_ERR)
5006 * and wakeups up this thread which will reap the thread and finish up.
5007 * This thread also removes any faulty devices (with nr_pending == 0).
5009 * The overall approach is:
5010 * 1/ if the superblock needs updating, update it.
5011 * 2/ If a recovery thread is running, don't do anything else.
5012 * 3/ If recovery has finished, clean up, possibly marking spares active.
5013 * 4/ If there are any faulty devices, remove them.
5014 * 5/ If array is degraded, try to add spares devices
5015 * 6/ If array has spares or is not in-sync, start a resync thread.
5017 void md_check_recovery(mddev_t *mddev)
5020 struct list_head *rtmp;
5024 bitmap_daemon_work(mddev->bitmap);
5029 if (signal_pending(current)) {
5030 if (mddev->pers->sync_request) {
5031 printk(KERN_INFO "md: %s in immediate safe mode\n",
5033 mddev->safemode = 2;
5035 flush_signals(current);
5040 test_bit(MD_RECOVERY_NEEDED, &mddev->recovery) ||
5041 test_bit(MD_RECOVERY_DONE, &mddev->recovery) ||
5042 (mddev->safemode == 1) ||
5043 (mddev->safemode == 2 && ! atomic_read(&mddev->writes_pending)
5044 && !mddev->in_sync && mddev->recovery_cp == MaxSector)
5048 if (mddev_trylock(mddev)) {
5051 spin_lock_irq(&mddev->write_lock);
5052 if (mddev->safemode && !atomic_read(&mddev->writes_pending) &&
5053 !mddev->in_sync && mddev->recovery_cp == MaxSector) {
5055 mddev->sb_dirty = 1;
5057 if (mddev->safemode == 1)
5058 mddev->safemode = 0;
5059 spin_unlock_irq(&mddev->write_lock);
5061 if (mddev->sb_dirty)
5062 md_update_sb(mddev);
5065 if (test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
5066 !test_bit(MD_RECOVERY_DONE, &mddev->recovery)) {
5067 /* resync/recovery still happening */
5068 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5071 if (mddev->sync_thread) {
5072 /* resync has finished, collect result */
5073 md_unregister_thread(mddev->sync_thread);
5074 mddev->sync_thread = NULL;
5075 if (!test_bit(MD_RECOVERY_ERR, &mddev->recovery) &&
5076 !test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
5078 /* activate any spares */
5079 mddev->pers->spare_active(mddev);
5081 md_update_sb(mddev);
5083 /* if array is no-longer degraded, then any saved_raid_disk
5084 * information must be scrapped
5086 if (!mddev->degraded)
5087 ITERATE_RDEV(mddev,rdev,rtmp)
5088 rdev->saved_raid_disk = -1;
5090 mddev->recovery = 0;
5091 /* flag recovery needed just to double check */
5092 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5093 md_new_event(mddev);
5096 /* Clear some bits that don't mean anything, but
5099 clear_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
5100 clear_bit(MD_RECOVERY_ERR, &mddev->recovery);
5101 clear_bit(MD_RECOVERY_INTR, &mddev->recovery);
5102 clear_bit(MD_RECOVERY_DONE, &mddev->recovery);
5104 if (test_bit(MD_RECOVERY_FROZEN, &mddev->recovery))
5106 /* no recovery is running.
5107 * remove any failed drives, then
5108 * add spares if possible.
5109 * Spare are also removed and re-added, to allow
5110 * the personality to fail the re-add.
5112 ITERATE_RDEV(mddev,rdev,rtmp)
5113 if (rdev->raid_disk >= 0 &&
5114 (test_bit(Faulty, &rdev->flags) || ! test_bit(In_sync, &rdev->flags)) &&
5115 atomic_read(&rdev->nr_pending)==0) {
5116 if (mddev->pers->hot_remove_disk(mddev, rdev->raid_disk)==0) {
5118 sprintf(nm,"rd%d", rdev->raid_disk);
5119 sysfs_remove_link(&mddev->kobj, nm);
5120 rdev->raid_disk = -1;
5124 if (mddev->degraded) {
5125 ITERATE_RDEV(mddev,rdev,rtmp)
5126 if (rdev->raid_disk < 0
5127 && !test_bit(Faulty, &rdev->flags)) {
5128 rdev->recovery_offset = 0;
5129 if (mddev->pers->hot_add_disk(mddev,rdev)) {
5131 sprintf(nm, "rd%d", rdev->raid_disk);
5132 sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
5134 md_new_event(mddev);
5141 clear_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5142 clear_bit(MD_RECOVERY_CHECK, &mddev->recovery);
5143 } else if (mddev->recovery_cp < MaxSector) {
5144 set_bit(MD_RECOVERY_SYNC, &mddev->recovery);
5145 } else if (!test_bit(MD_RECOVERY_SYNC, &mddev->recovery))
5146 /* nothing to be done ... */
5149 if (mddev->pers->sync_request) {
5150 set_bit(MD_RECOVERY_RUNNING, &mddev->recovery);
5151 if (spares && mddev->bitmap && ! mddev->bitmap->file) {
5152 /* We are adding a device or devices to an array
5153 * which has the bitmap stored on all devices.
5154 * So make sure all bitmap pages get written
5156 bitmap_write_all(mddev->bitmap);
5158 mddev->sync_thread = md_register_thread(md_do_sync,
5161 if (!mddev->sync_thread) {
5162 printk(KERN_ERR "%s: could not start resync"
5165 /* leave the spares where they are, it shouldn't hurt */
5166 mddev->recovery = 0;
5168 md_wakeup_thread(mddev->sync_thread);
5169 md_new_event(mddev);
5172 mddev_unlock(mddev);
5176 static int md_notify_reboot(struct notifier_block *this,
5177 unsigned long code, void *x)
5179 struct list_head *tmp;
5182 if ((code == SYS_DOWN) || (code == SYS_HALT) || (code == SYS_POWER_OFF)) {
5184 printk(KERN_INFO "md: stopping all md devices.\n");
5186 ITERATE_MDDEV(mddev,tmp)
5187 if (mddev_trylock(mddev)) {
5188 do_md_stop (mddev, 1);
5189 mddev_unlock(mddev);
5192 * certain more exotic SCSI devices are known to be
5193 * volatile wrt too early system reboots. While the
5194 * right place to handle this issue is the given
5195 * driver, we do want to have a safe RAID driver ...
5202 static struct notifier_block md_notifier = {
5203 .notifier_call = md_notify_reboot,
5205 .priority = INT_MAX, /* before any real devices */
5208 static void md_geninit(void)
5210 struct proc_dir_entry *p;
5212 dprintk("md: sizeof(mdp_super_t) = %d\n", (int)sizeof(mdp_super_t));
5214 p = create_proc_entry("mdstat", S_IRUGO, NULL);
5216 p->proc_fops = &md_seq_fops;
5219 static int __init md_init(void)
5223 printk(KERN_INFO "md: md driver %d.%d.%d MAX_MD_DEVS=%d,"
5224 " MD_SB_DISKS=%d\n",
5225 MD_MAJOR_VERSION, MD_MINOR_VERSION,
5226 MD_PATCHLEVEL_VERSION, MAX_MD_DEVS, MD_SB_DISKS);
5227 printk(KERN_INFO "md: bitmap version %d.%d\n", BITMAP_MAJOR_HI,
5230 if (register_blkdev(MAJOR_NR, "md"))
5232 if ((mdp_major=register_blkdev(0, "mdp"))<=0) {
5233 unregister_blkdev(MAJOR_NR, "md");
5237 blk_register_region(MKDEV(MAJOR_NR, 0), MAX_MD_DEVS, THIS_MODULE,
5238 md_probe, NULL, NULL);
5239 blk_register_region(MKDEV(mdp_major, 0), MAX_MD_DEVS<<MdpMinorShift, THIS_MODULE,
5240 md_probe, NULL, NULL);
5242 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5243 devfs_mk_bdev(MKDEV(MAJOR_NR, minor),
5244 S_IFBLK|S_IRUSR|S_IWUSR,
5247 for (minor=0; minor < MAX_MD_DEVS; ++minor)
5248 devfs_mk_bdev(MKDEV(mdp_major, minor<<MdpMinorShift),
5249 S_IFBLK|S_IRUSR|S_IWUSR,
5253 register_reboot_notifier(&md_notifier);
5254 raid_table_header = register_sysctl_table(raid_root_table, 1);
5264 * Searches all registered partitions for autorun RAID arrays
5267 static dev_t detected_devices[128];
5270 void md_autodetect_dev(dev_t dev)
5272 if (dev_cnt >= 0 && dev_cnt < 127)
5273 detected_devices[dev_cnt++] = dev;
5277 static void autostart_arrays(int part)
5282 printk(KERN_INFO "md: Autodetecting RAID arrays.\n");
5284 for (i = 0; i < dev_cnt; i++) {
5285 dev_t dev = detected_devices[i];
5287 rdev = md_import_device(dev,0, 0);
5291 if (test_bit(Faulty, &rdev->flags)) {
5295 list_add(&rdev->same_set, &pending_raid_disks);
5299 autorun_devices(part);
5304 static __exit void md_exit(void)
5307 struct list_head *tmp;
5309 blk_unregister_region(MKDEV(MAJOR_NR,0), MAX_MD_DEVS);
5310 blk_unregister_region(MKDEV(mdp_major,0), MAX_MD_DEVS << MdpMinorShift);
5311 for (i=0; i < MAX_MD_DEVS; i++)
5312 devfs_remove("md/%d", i);
5313 for (i=0; i < MAX_MD_DEVS; i++)
5314 devfs_remove("md/d%d", i);
5318 unregister_blkdev(MAJOR_NR,"md");
5319 unregister_blkdev(mdp_major, "mdp");
5320 unregister_reboot_notifier(&md_notifier);
5321 unregister_sysctl_table(raid_table_header);
5322 remove_proc_entry("mdstat", NULL);
5323 ITERATE_MDDEV(mddev,tmp) {
5324 struct gendisk *disk = mddev->gendisk;
5327 export_array(mddev);
5330 mddev->gendisk = NULL;
5335 module_init(md_init)
5336 module_exit(md_exit)
5338 static int get_ro(char *buffer, struct kernel_param *kp)
5340 return sprintf(buffer, "%d", start_readonly);
5342 static int set_ro(const char *val, struct kernel_param *kp)
5345 int num = simple_strtoul(val, &e, 10);
5346 if (*val && (*e == '\0' || *e == '\n')) {
5347 start_readonly = num;
5353 module_param_call(start_ro, set_ro, get_ro, NULL, 0600);
5354 module_param(start_dirty_degraded, int, 0644);
5357 EXPORT_SYMBOL(register_md_personality);
5358 EXPORT_SYMBOL(unregister_md_personality);
5359 EXPORT_SYMBOL(md_error);
5360 EXPORT_SYMBOL(md_done_sync);
5361 EXPORT_SYMBOL(md_write_start);
5362 EXPORT_SYMBOL(md_write_end);
5363 EXPORT_SYMBOL(md_register_thread);
5364 EXPORT_SYMBOL(md_unregister_thread);
5365 EXPORT_SYMBOL(md_wakeup_thread);
5366 EXPORT_SYMBOL(md_check_recovery);
5367 MODULE_LICENSE("GPL");
5369 MODULE_ALIAS_BLOCKDEV_MAJOR(MD_MAJOR);